JP2010164222A - Finned heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact finned heat exchanger preventing dropping of condensate adhered to the heat exchanger, having high heat exchange capacity, facilitating management in manufacturing and having high storage performance in air conditioning equipment and refrigerating equipment. <P>SOLUTION: A front face side heat exchanger 20 formed to have an approximately V-shape and a back face side heat exchanger 40 are arranged, to facilitate smooth flowing-down of condensation water adhered to fins. Heat transfer pipes with two types of predetermined outer diameters are arranged in the fins of the lower part of the front side heat exchanger in two rows and one row and in the fins of the upper part of the front face side heat exchanger and of the back face side heat exchanger in three rows, at predetermined intervals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a finned heat exchanger mounted on an indoor unit of an air conditioner.

  In general, as shown in FIG. 6, an indoor unit of an air conditioner has at least one suction port such as a front suction port 102 a and an upper suction port 102 b and one or more suction ports 103 such as a lower suction port 103. A blowout opening is provided, and a once-through fan 105 and a finned heat exchanger 104 are accommodated in the casing 101.

  This conventional finned heat exchanger 104 is arranged on the front side in the casing 101, and is arranged on the main front side heat exchanger 104A bent near the center in the vertical direction and on the back side in the casing 101. The rear side heat exchanger 104B and auxiliary heat exchangers 104C and 104D attached to the front face of the front side heat exchanger 104A, respectively, are configured. And it arrange | positions in the form which surrounds the once-through fan 105 from the windward side by 104 A of front side heat exchangers and 104 A of back side heat exchangers, and accommodates the heat exchanger with a fin as large as possible in the limited space. The auxiliary heat exchangers 104C and 104D are provided to improve the heat exchanging ability. However, the auxiliary heat exchangers 104C and 104D are manufactured in a separate process from the main front side heat exchanger 104A and the back side heat exchanger 104B, and then the main front side. It is additionally connected to the side heat exchanger 104A and the back side heat exchanger 104B and attached, and FIG. 6 shows a case where it is additionally connected to the main front side heat exchanger 104A. Also, if there is a space without fins in the vicinity of the bent portion of the front side heat exchanger 104A, the airflow passes through the finned heat exchanger with little heat exchange. Therefore, the spacer 106 is provided.

  On the other hand, as a structure that eliminates the need to bend the front-side heat exchanger 104A, eliminates the spacer 106, and prevents airflow from passing through the finned heat exchanger without heat exchange. The structure which formed the front side heat exchanger in circular arc shape is disclosed (for example, refer patent document 1).

  In this Patent Document 1, as shown in FIGS. 7 and 8, an air conditioner in which the shape of the fin 202 of the front side heat exchanger 201 </ b> A is formed in an arc shape so as to surround a part of the peripheral surface of the once-through fan 203. Indoor units are disclosed. A plurality of rows of heat transfer tubes 204 inserted substantially perpendicular to the front side heat exchanger 201A are provided, and the windward and leeward rows of these heat transfer tubes 204 are arranged to draw an isosceles triangle. ing. Therefore, as a result, the step pitch B of the leeward heat transfer tubes 204 arranged inside the arc-shaped portion is larger than the step pitch A of the heat transfer tubes 204 in the upwind row arranged outside the arc-shaped portions. It is formed smaller.

According to this configuration, the spacer 106 is not required, and no waste material is generated at the location corresponding to the spacer 106 in the material of the fin 202 at the time of manufacture. Therefore, the waste material of the material of the fin 202 can be reduced, and each heat transfer tube 204 can be reduced. There is an advantage that only three types of bending pitches A, B, and C are required for the hairpins and return bends that communicate with each other. Further, since the spacer 106 is not provided, the area of the fin 202 is increased by the portion corresponding to the spacer 106, and the heat exchange capability is improved.
Japanese Patent Laid-Open No. 9-42699

  However, in the heat exchanger with fins of the configuration of Patent Document 1, the front-side heat exchanger 201A has an arc shape and the upper portion of the fin 202 has a gentle slope, so the heat exchanger with fins is used as an evaporator. In the worst case, the condensed water stays in the upper part of the fin 202, or in the worst case, the condensed water does not flow along the fin 202, but the water drops fall on the once-through blower 203 and drops from the outlet 205. May be scattered.

  The present invention solves such a conventional problem, improves the form and manufacturing method of the finned heat exchanger, and is as large as possible in a limited space of the indoor unit of the air conditioner, particularly in a narrow space. A heat exchanger with fins is housed to greatly improve the heat exchange capacity, and when used as an evaporator, water that condenses on the fin surface can flow smoothly along the fins. An object of the present invention is to provide a finned heat exchanger that is easy.

  In order to achieve the above object, the finned heat exchanger according to the present invention is arranged in the middle of the wind circuit from the inlet of the casing to the once-through fan or in the middle of the wind circuit from the once-through fan to the outlet. A heat exchanger and a back side heat exchanger are configured, and the front side heat exchanger and the back side heat exchanger are arranged in parallel at predetermined intervals, and a plurality of fins through which gas flows, Two pipes that are inserted into the fins at a substantially right angle and that have a plurality of heat transfer tubes through which the refrigerant flows, and that have the same obtuse angle on the windward front edge and the leeward rear edge of the fin of the front heat exchanger. A straight upwind edge, two straight downwind trailing edges, a curved upwind leading edge connecting each of the upwind front edge and the downwind trailing edge, With a curvilinear leeward trailing edge, it is formed in a generally U shape, The distance between the windward leading edge and the leeward trailing edge in the region of the front side heat exchanger fins close to the cross-flow fan is 15 to 35 mm, and is close to the cross-flow fan of the fins of the front side heat exchanger The outer diameter of the heat transfer tube inserted in the region sandwiched between the side region and the curved upwind leading edge and the curved downwind trailing edge is 5 to 8 mm, and the direction along the main gas flow direction Two rows and one row are arranged in the row direction, and the distance between the straight windward leading edge and the straight windward trailing edge in the region of the front side heat exchanger on the side far from the cross-flow fan The distance between the windward leading edge and the leeward trailing edge of the fins of the rear side heat exchanger is set to 20 to 30 mm, the region of the front side heat exchanger far from the cross-flow fan, and the rear side heat exchange The outer diameter of the heat transfer tube inserted into the fin of the vessel is 3-7 mm, The heat transfer tubes are arranged in three rows in the row direction along the mainstream direction of the body, and the outer diameter dimensions of the heat transfer tubes inserted into the fins of the front side heat exchanger and the back side heat exchanger are configured in two types Therefore, it is possible to obtain a high heat exchanging capacity without significantly increasing the ventilation resistance, and therefore, it is possible to improve the air volume at the same noise and to exhibit a high heat transfer coefficient. In addition, two rows and one row of heat transfer tubes having an outer diameter of 5 to 8 mm are arranged in a region close to the once-through fan and a curved region of the front-side heat exchanger, and on the side far from the once-through fan of the front-side heat exchanger. By arranging three rows of heat transfer tubes with outer diameters of 3 to 7 mm in the area and rear side heat exchanger, the air flow resistance is improved as a whole heat exchanger, improving the wind speed distribution, and exhibiting high heat exchange capability I can do it. Therefore, a larger heat exchanger with fins can be accommodated in a limited space, particularly in a space with a narrow depth, and a greater heat exchange capability can be exhibited. Further, the front-side heat exchanger does not need to be bent later, and a spacer that is necessary when bent is not required. Moreover, when using this heat exchanger with fins as an evaporator, water droplets that condense on the fins in each of the front side heat exchanger and the back side heat exchanger can flow down smoothly through both continuous fins, The upper side of the front-side heat exchanger is surrounded by a straight upwind edge and a leeward trailing edge, and is inclined at a certain angle close to the vertical, so water droplets condensed on the fin surface during evaporation Will not stay. Further, by configuring the heat transfer tube in two types, it is possible to configure a heat exchanger that is easy to manage in manufacture and has a high heat exchange capacity.

  According to the present invention, it can be easily stored in a limited space of an indoor unit of an air conditioner, particularly a space with a narrow depth, and it is easy to manage in manufacturing, has excellent heat exchange capability, and is used as an evaporator. When it does, the heat exchanger with a fin which can flow down the water condensed on the fin surface smoothly along a fin can be constituted.

  1st invention comprises the front side heat exchanger and back side heat exchanger which are arrange | positioned in the middle of the wind circuit from the suction inlet of a casing to a once-through fan, or the middle of the wind circuit from a once-through fan to a blower outlet. The front-side heat exchanger and the rear-side heat exchanger are arranged in parallel at predetermined intervals, respectively, and a large number of fins through which gas flows, and the refrigerant flows through the fins inserted at substantially right angles. A plurality of heat transfer tubes, two straight windward leading edges having the same obtuse angle respectively on the windward leading edge and leeward trailing edge of the fin of the front heat exchanger, and two The straight leeward trailing edge, one curved leeward leading edge connecting the two of the leeward leading edge and the leeward trailing edge, and one curved leeward trailing edge The front side heat exchanger fins are close to the once-through fan. The distance between the windward leading edge and the windward trailing edge in the region on the side is 15 to 35 mm, the region on the side near the cross-flow fan of the fins of the front-side heat exchanger, and the curved windward leading edge and curve The outer diameter of the heat transfer tube inserted in a region sandwiched between the leeward trailing edges of the shape is 5 to 8 mm, and two rows and one row are arranged in a row direction which is a direction along the main flow direction of gas, The distance between the straight windward leading edge and the straight windward trailing edge in the region of the fin of the side heat exchanger far from the cross-flow fan, and the windward leading edge of the fin of the rear heat exchanger And the leeward trailing edge is set to 20 to 30 mm, and the outer diameter of the heat transfer tube inserted into the region of the front heat exchanger far from the cross-flow fan and the fins of the rear heat exchanger is 3 ˜7 mm, and the heat transfer tubes are arranged in three rows in the row direction along the gas main flow direction. And location constitutes an outer diameter of two of the front-side heat exchanger and the rear side heat exchanger heat transfer tube that is inserted into the fin.

  With this configuration, it is possible to obtain a high heat exchanging capacity without increasing the ventilation resistance so much, and therefore, it is possible to improve the air volume at the same noise and to exhibit a high heat transfer coefficient. In addition, two rows and one row of heat transfer tubes having an outer diameter of 5 to 8 mm are arranged in a region close to the once-through fan and a curved region of the front-side heat exchanger, and on the side far from the once-through fan of the front-side heat exchanger. By arranging three rows of heat transfer tubes with outer diameters of 3 to 7 mm in the area and rear side heat exchanger, the air flow resistance is improved as a whole heat exchanger, improving the wind speed distribution, and exhibiting high heat exchange capability I can do it. Therefore, a larger heat exchanger with fins can be accommodated in a limited space, particularly in a space with a narrow depth, and a greater heat exchange capability can be exhibited. Further, the front-side heat exchanger does not need to be bent later, and a spacer that is necessary when bent is not required. Moreover, when using this heat exchanger with fins as an evaporator, water droplets that condense on the fins in each of the front side heat exchanger and the back side heat exchanger can flow down smoothly through both continuous fins, The upper side of the front-side heat exchanger is surrounded by a straight upwind edge and a leeward trailing edge, and is inclined at a certain angle close to the vertical, so water droplets condensed on the fin surface during evaporation Will not stay. Further, by configuring the heat transfer tube in two types, it is possible to configure a heat exchanger that is easy to manage in manufacture and has a high heat exchange capacity.

In the second aspect of the present invention, one type of outer diameter dimension is provided for the fins in the region between the front side heat exchanger near the cross-flow fan and the curved upwind leading edge and the curved downwind trailing edge. When the finned heat exchanger is used as a condenser, it is used as the refrigerant inlet side, and when it is used as an evaporator, it is used as the refrigerant outlet side, and the refrigerant flows in three paths. The heat transfer tube having one outer diameter smaller than the heat transfer tube is inserted into the region far from the cross-flow fan of the front side heat exchanger and the fin of the rear side heat exchanger, and the heat with fins When the exchanger is used as a condenser, it is used as an outlet side of the refrigerant, and when used as an evaporator, it is used as an inlet side of the refrigerant, and a region of the front side heat exchanger far from the cross-flow fan, and On the windward leading edge side of the rear heat exchanger One row of heat tubes is configured so that the refrigerant flows in one path, and two rows of heat transfer tubes on the leeward trailing edge side are configured so that the refrigerant flows in four paths, and when the finned heat exchanger is used as a condenser, it is leeward. When the refrigerant flows through one row of the heat transfer tubes on the windward leading edge side through the two heat transfer tubes on the trailing edge side, and the finned heat exchanger is used as an evaporator, one row of the heat transfer tubes on the windward front edge side is used. Then, the refrigerant flows through the two heat transfer tubes on the leeward trailing edge side.

  With this configuration, both heat transfer coefficient improvement and refrigerant flow resistance reduction in the pipe can be achieved at the same time, and two rows and one row of heat transfer tubes are arranged in the region near the cross-flow fan of the front side heat exchanger and the curved region. The outer diameter of the heat exchanger is made larger than the outer diameter of the heat transfer tubes arranged in three rows in the area far from the once-through fan of the front side heat exchanger and the rear side heat exchanger. Uniformity can be achieved and high heat exchange capability can be demonstrated.

  In particular, when a finned heat exchanger is used as a condenser, the refrigerant flows in one path through a region far from the once-through fan of the front side heat exchanger and one row of heat transfer tubes on the windward leading edge side of the rear side heat exchanger. With such a configuration, it is possible to sufficiently secure the supercooling region of the condenser, and to greatly increase the heat exchange capability.

  3rd invention is one type of outer diameter size to the fin of the area | region close | similar to the once-through fan of a front side heat exchanger, and the area | region pinched by the curved upwind front edge and the curved downwind trailing edge. When the finned heat exchanger is used as a condenser, it is used as a refrigerant inlet side. When it is used as an evaporator, it is used as a refrigerant outlet side, and the refrigerant flows in four paths. The heat transfer tube having one outer diameter smaller than the heat transfer tube is inserted into the region of the front side heat exchanger far from the cross-flow fan and the fins of the rear side heat exchanger, with the fins When using the heat exchanger as a condenser, it is used as an outlet side of the refrigerant, and when used as an evaporator, it is used as an inlet side of the refrigerant, and a region of the front side heat exchanger far from the cross-flow fan, And upstream of the rear heat exchanger One row of heat transfer tubes on the side is configured so that the refrigerant flows through one path, and two rows of heat transfer tubes on the leeward trailing edge side are configured so that the refrigerant flows on six paths, and the finned heat exchanger is used as a condenser. In this case, the refrigerant flows through the two heat transfer tubes on the leeward trailing edge side through the one heat transfer tube on the leeward leading edge side, and when the finned heat exchanger is used as an evaporator, The refrigerant flows through two rows of heat transfer tubes on the leeward trailing edge side through one row of heat transfer tubes.

  With this configuration, even when the refrigerant circulation amount is large, the heat transfer coefficient in the pipe can be improved and the refrigerant flow resistance can be reduced, and the front side heat exchanger has two rows in the region close to the cross-flow fan and in the curved region. And by making the outer diameter of the heat transfer tubes arranged in one row larger than the outer diameter of the heat transfer tubes arranged in three rows in the region far from the once-through fan of the front side heat exchanger and the rear side heat exchanger, Realizes the uniform distribution of the wind speed of the exchanger and exhibits high heat exchange capability.

  In particular, when a finned heat exchanger is used as a condenser, the refrigerant flows in one path through a region far from the once-through fan of the front side heat exchanger and one row of heat transfer tubes on the windward leading edge side of the rear side heat exchanger. With such a configuration, it is possible to quickly ensure the supercooling of the refrigerant in the condenser with a small number of heat transfer tubes, and it is possible to greatly increase the heat exchange capability.

  4th invention is a fin part of the area | region far from a crossflow fan among two area | regions pinched | interposed by the linear windward front edge and linear leeward trailing edge of the fin in a front side heat exchanger. In the heat transfer tubes to be inserted and the back side heat exchanger, the arrangement pitch of the three rows of heat transfer tubes in the portion sandwiched between the straight portion of the windward leading edge and the straight portion of the leeward trailing edge is set to 10.0 to 16. The heat transfer tubes to be inserted into the fins in the region near the cross-flow fan in the front side heat exchanger are arranged in two rows and one row in the row direction, which is the direction along the main flow direction of the gas. The arrangement pitch of the heat transfer tubes is set to 13.0 to 20.0 mm in the step direction perpendicular to the main flow direction.

  With this configuration, fin efficiency can be improved and high air-side heat transfer coefficient can be obtained, and the difference in ventilation resistance as a whole heat exchanger can be reduced to improve the wind speed distribution. It can improve the airflow and can demonstrate its excellent ability.

  5th invention sets the shortest distance of the heat exchanger tube of a heat exchanger with a fin, and the windward leading edge or leeward trailing edge of a fin to 1.0 mm or more, and also the lee of the front side heat exchanger nearest to a cross-flow fan The distance between the trailing edge and the once-through fan is 10 mm or more.

  With this configuration, when a finned heat exchanger is used as an evaporator, the phenomenon that condensed water that adheres to the fin surface and flows down hits the heat transfer tube and jumps out of the fin's windward leading edge or leeward trailing edge is suppressed. Furthermore, by setting the distance from the leeward trailing edge to the once-through fan to be 10 mm or more, it is possible to prevent the condensed water adhering to the fin surface from being sucked into the once-through fan and jumping out from the outlet.

  In a sixth aspect of the present invention, when there is a temperature difference between the refrigerants flowing inside between the two heat transfer tubes adjacent in the row direction and the step direction, the fins between the rows of the two heat transfer tubes and the fins between the steps In addition to providing notches in the direction along the row direction, holes having an outer diameter of 3 to 6 mm are provided so that they can be completely cut from the front edges of the fins by post-processing.

  With this configuration, it is possible to prevent a heat exchange loss due to heat conduction between the heat transfer tubes that pass through the fins, and thus it is possible to configure a finned heat exchanger that does not reduce the heat exchange capability.

  In a seventh aspect of the present invention, among the two regions sandwiched between the linear windward leading edge and the linear leeward trailing edge of the fin in the front side heat exchanger, the windward side of the region far from the cross-flow fan When an auxiliary heat exchanger is disposed and the finned heat exchanger is used as a condenser, the auxiliary heat exchanger is used at the outlet side of the refrigerant flow path, and the finned heat exchanger is used as an evaporator. The auxiliary heat exchanger is used as the inlet side of the refrigerant flow path, and the refrigerant flows in one path through the heat transfer tubes inserted in the fins of the auxiliary heat exchanger.

  With this configuration, when a finned heat exchanger is used as a condenser, it is possible to sufficiently ensure refrigerant supercooling, improve the condenser capacity, and improve the ventilation resistance of the heat exchanger as a whole. The wind speed distribution can be improved by reducing the difference between the two, so that it is possible to improve the air volume at the same noise and to exhibit excellent performance. Furthermore, in order to reduce the size of the indoor heat exchanger, when the amount of refrigerant with the outdoor heat exchanger is unbalanced, when the heat exchanger with fins is used as a condenser, the auxiliary heat exchanger is connected to the receiver. It plays a role, eliminates the imbalance of the refrigerant amount, and can generally reduce the size of the liquid receiver disposed in the outdoor unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
Embodiment 1 of the present invention will be described below. First, an indoor unit of an air conditioner on which a finned heat exchanger according to the present embodiment is mounted will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of the indoor unit, and FIG. 2 is a longitudinal sectional view of fins of the heat exchanger with fins.

  1 and 2, the casing 2 of the indoor unit 1 of the air conditioner is provided with suction ports 3a and 3b on the front surface and the upper surface, and an outlet port 4 on the lower surface. The once-through fan 5 and the heat exchanger 10 with fins are accommodated.

  The finned heat exchanger 10 includes a front side heat exchanger 20 disposed on the front side in the casing 2 and a back side heat exchanger 40 disposed on the back side in the casing 2. The front-side heat exchanger 20 includes two straight windward front edges 22 and 23 having the same obtuse angle on the windward front edge and the leeward rear edge of the fin 21 and two straight windward rear edges. Edge 24, 25, one curvilinear windward leading edge 26 connecting each of the windward leading edges 22, 23 and leeward trailing edges 24, 25, and one curvilinear leeward trailing edge 27 It is formed in a substantially square shape. Further, the front side heat exchanger 20 and the back side heat exchanger 40 are arranged so as to surround the once-through fan 5 from the windward side.

  In the present embodiment, as shown in FIG. 1 and FIG. 2, the interval between the so-called stepwise heat transfer tubes, ie, the step pitch, which is perpendicular to the main flow direction (flow direction) of the gas (air). As for the number in the row direction along the main flow direction of the gas, that is, the number of rows, the straight upwind front edges 22 and 23 of the fins 21 of the front side heat exchanger 20 having a substantially square shape are linear. Of the two regions sandwiched between the leeward trailing edges 24 and 25, the region closer to the once-through fan 5, the region farther from the once-through fan 5, and the linear wind of the fins 41 of the rear side heat exchanger 40 The region sandwiched between the upper front edge 42 and the straight leeward rear edge 43 is formed differently.

  That is, in the two regions sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the substantially U-shaped front side heat exchanger 20, the far side from the once-through fan 5 is located. A region, that is, a region sandwiched between the straight upwind leading edge 23 and the straight downwind trailing edge 25 and the straight upwind front edge 42 of the fin 41 of the back side heat exchanger 40 and the straight downwind rear The distance X1, X2 between the windward leading edge and the leeward trailing edge of the region sandwiched between the edges 43 is 20 mm to 30 mm, and the heat transfer tubes inserted into the fins 21 and 41 are outside the range of 3 to 7 mm. One type of heat transfer tube 30 having a diameter is used, three rows are arranged in the row direction, and the pitch A in the step direction is 10 to 16 mm.

  In addition, of the two regions sandwiched between the straight upwind front edges 22 and 23 and the straight downwind rear edges 24 and 25 of the fins 21 of the substantially U-shaped front side heat exchanger 20, The distance Y between the windward leading edge and the windward trailing edge of the region close to the blower 5, that is, the region sandwiched between the linear windward leading edge 22 and the linear windward trailing edge 24 is 15 mm to 35 mm, As the heat transfer tubes inserted into the fins 21, one type of heat transfer tube 31 having an outer diameter in the range of 5 to 8 mm is used, two rows are arranged in the row direction, one row is arranged at the lower end, and the pitch B in the step direction is Is formed as 13 to 20 mm. The heat transfer tubes inserted into the fins 21 in the region sandwiched between the curved upwind front edge 26 and the curved downwind rear edge 27 in the front heat exchanger 20 also have an outer diameter in the range of 5 to 8 mm. 1 type of heat transfer tube 31 is used.

  Further, for example, when considering the refrigerant path configuration of an indoor unit of a small-capacity air conditioner that has an optimum operating efficiency when the rated cooling capacity is about 4.0 kW or less, FIG. 3 shows a heat exchange with fins according to the present embodiment. The flow of the refrigerant | coolant at the time of using the container 10 as an evaporator is shown.

That is, in the two regions sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the substantially U-shaped front side heat exchanger 20, the far side from the once-through fan 5 is located. A region, that is, a region sandwiched between the straight upwind leading edge 23 and the straight downwind trailing edge 25, and the straight upwind front edge 42 of the fin 41 of the back side heat exchanger 40 and the straight downwind. The refrigerant flows along one line of the upwind front edge side of the heat transfer tube 30 having an outer diameter in the range of 3 to 7 mm inserted in three lines in the region sandwiched by the rear edge 43 through one path of the refrigerant path 50, and then is divided. Similarly, the refrigerant flows through the four lines of the refrigerant paths 52a, 52b, 52c, and 52d through the two rows on the leeward trailing edge side of the heat transfer tube 30 through the condenser 51. Thereafter, the refrigerant flows in a fully opened state during the air conditioning operation, and is closed during the dehumidifying operation, and after passing through the flow divider 53 serving as a throttle, the refrigerant is a substantially U-shaped front side heat exchanger. 20 fin 21 straight upwind leading edges 22, 2
3 and the linear region of the leeward trailing edges 24 and 25, the region closer to the cross-flow fan 5, that is, the linear leeward leading edge 22 and the linear leeward trailing edge 24. The outer diameter in the range of 5 to 8 mm inserted in two rows in the sandwiched region and the region sandwiched by the curved upwind front edge 26 and the curved downwind rear edge 27 in the front side heat exchanger 20 The heat transfer tube 31 flows through three paths of the refrigerant paths 54a, 54b, and 54c, and flows out from the heat exchanger 10 with fins.

  With the above configuration, it is possible to achieve an optimum heat exchanger performance in which the wind speed distribution is substantially uniform as a whole heat exchanger and the heat transfer coefficient in the heat transfer tube and the pressure loss are balanced.

  For example, when the cooling rated capacity is high capacity of about 4.0 kW or higher, the refrigerant flow rate in the heat transfer tube is fast, and the pressure loss is large, the refrigerant path with the increased number of refrigerant paths to reduce the pressure loss Recommended and an example is shown in FIG.

  That is, in the two regions sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the substantially U-shaped front side heat exchanger 20, the far side from the once-through fan 5 is located. A region, that is, a region sandwiched between the straight upwind leading edge 23 and the straight downwind trailing edge 25 and the straight upwind front edge 42 of the fin 41 of the back side heat exchanger 40 and the straight downwind rear The refrigerant flows in one line of the windward leading edge side of the heat transfer tube 30 having an outer diameter in the range of 3 to 7 mm inserted in three rows in the region sandwiched by the edge 43 through one path of the refrigerant path 60, and then the flow divider After passing through 61, the two downstream rows on the leeward trailing edge side of the heat transfer tube 30 flow in six paths including refrigerant paths 62a, 62b, 62c, 62d, 62e, and 62f. After that, the refrigerant is out of the two regions sandwiched between the straight upwind front edges 22 and 23 and the straight downwind rear edges 24 and 25 of the fins 21 of the generally U-shaped front side heat exchanger 20. , A region on the side close to the once-through fan 5, that is, a region sandwiched between the straight upwind leading edge 22 and the straight downwind trailing edge 24, and the curved upwind front edge 26 in the front side heat exchanger 20 A heat transfer pipe 31 having an outer diameter in the range of 5 to 8 mm inserted in two rows in a region sandwiched by the curved leeward side trailing edge 27 flows through four paths of the refrigerant paths 64a, 64b, 64c, and 64d. It flows out from the attached heat exchanger 10.

  When a mechanism that serves as a throttle during dehumidifying operation is not required in this way, the refrigerant that has flowed through multiple paths (refrigerant paths 62a, 62b, 62c, 62d, 62e, 62f) is merged as necessary, and further downstream It is good also as a structure which flows without passing through a diverter to the path | route (refrigerant path | route 64a, 64b, 64c, 64d).

  In particular, when the refrigerant flow rate is large and the pressure loss is large, the two are sandwiched between the straight upwind front edge and the straight downwind trailing edge of the fin 21 of the generally U-shaped front side heat exchanger 20. Of the two regions, the region far from the once-through fan 5, that is, the region sandwiched between the straight windward leading edge 23 and the straight leeward trailing edge 25, and the linear shape of the fins 41 of the back side heat exchanger 40. Outer diameter of the heat transfer tube 30 inserted in one row on the windward leading edge side among the three rows of heat transfer tubes 30 inserted in the region sandwiched by the windward leading edge 42 and the linear leeward trailing edge 43 Is similar to the outer diameter of the heat transfer tubes 30 inserted in the two rows on the leeward trailing edge side of the heat transfer tubes 30, and the straight upwind front edges 22 of the fins 21 of the substantially U-shaped front side heat exchanger 20, Of the two regions sandwiched between the linear leeward trailing edge 24 and 25 and the linear leeward trailing edge 24, 25, the region closer to the cross-flow fan 5, The region sandwiched between the straight upwind leading edge 22 and the straight downwind trailing edge 24 and the curved upwind front edge 26 and the curved downwind rear edge 27 of the front heat exchanger 20 are sandwiched. It is also possible to set it equal to the outer diameter of the heat transfer tubes inserted in two rows in the region so that the refrigerant flows through one path, or the refrigerant flows through two or more paths (not shown).

  The refrigerant path configuration described above is an example, and the same meaning is achieved even if realized by other combinations.

In the present embodiment, the distance C between the heat transfer tubes 30 and 31 and the windward leading edge of the fin and the distance D between the finward trailing edge are 1.0 mm or more at the shortest, and further closest to the once-through fan 5. Since the distance E between the leeward trailing edge 24 of the front side heat exchanger 20 and the once-through fan 5 is 10 mm or more, when the finned heat exchanger 10 is used as an evaporator, it adheres to the surfaces of the fins 21 and 41 and flows down. The phenomenon that the condensed water hits the heat transfer tubes 30 and 31 and jumps out from the windward leading edges 22, 23, 26, 42 or the leeward trailing edges 24, 24, 27, 43 of the fins 21, 41 can be suppressed. .

  When the finned heat exchanger 10 is divided into a reheater and an evaporator in the stage direction and the dehumidifying operation is performed, the linear wind of the fins 21 in the substantially square front heat exchanger 20 is performed. Of the two regions sandwiched between the upper leading edge and the straight leeward trailing edge, the region far from the cross-flow fan 5, that is, the region sandwiched between the windward leading edge 23 and the leeward trailing edge 25, and the rear side heat exchange. The recirculation device 40 is used as a reheater, and the flow through the two regions sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 in the substantially square front heat exchanger 20 The area near the blower 5, that is, the area sandwiched between the windward leading edge 22 and the leeward trailing edge 24, and the curved upwind front edge 26 and the curved downwind side of the fin 21 in the front heat exchanger 20. By using the region sandwiched between the trailing edge 27 as an evaporator, the heat of the reheater and the evaporator Properly balance the load can be carried out satisfactory dehumidifying operation. Also, since the reheater is located vertically above the evaporator, the condensed water that condenses on the fins in the evaporator area hits the surface of the fins of the reheater and re-evaporates to humidify the room. Can be prevented.

  In addition, when there is a temperature difference in the fluid flowing inside between the two heat transfer tubes 30 and 31 adjacent to each other in the row direction, the fins 21 and 41 in the center between the rows of the two heat transfer tubes 30 and 31 are arranged in the step direction. Cuts 11 are provided in the direction along the outline, and holes 12a, 12b, and 12c with outer diameters of 3 to 6 mm are provided so that the blades can be inserted from the direction of the windward front edges 23 and 42 of the fins 21 and 41 and completely cut by post-processing. Since the heat exchange loss due to heat conduction through the fins 21 and 41 can be prevented by cutting the portion in post-processing, the heat exchange capability is not reduced.

  By adopting such a configuration, the fin 21 in the front-side heat exchanger 20 and the fin 41 in the back-side heat exchanger 40 can be configured to be continuous from the upper end to the lower end. Is used as an evaporator, water droplets condensing on the fins 21 and 41 flow along the respective fins 21 and 41 smoothly and smoothly flow down. Furthermore, since the upper side of the fin 21 of the front side heat exchanger 20 is inclined at a constant angle close to the vertical surrounded by the straight line of the windward leading edge 23 and the straight line of the leeward trailing edge 25, the fin 21 is at the time of evaporation. Water droplets that condense on the surface of the water do not stay. That is, it is possible to suppress the phenomenon of jumping out from the windward leading edges 22, 23, 26, 42 or the leeward trailing edges 24, 24, 27, 43 of the fins 21, 41, and ventilation by water droplets condensed on the fin surface. An increase in resistance can be suppressed.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 5 is a longitudinal sectional view of the indoor unit according to the present embodiment. The same reference numerals as those in the first embodiment indicate the same or corresponding parts, and the description thereof is omitted. The portion different from the first embodiment is sandwiched between the straight upwind front edges 22 and 23 and the straight downwind rear edges 24 and 25 of the fins 21 of the generally U-shaped front heat exchanger 20. Of the two regions, when the auxiliary heat exchanger 70 is arranged on the windward side of the windward leading edge 23 in the region far from the once-through fan 5, and the finned heat exchanger 10 is used as a condenser, auxiliary heat exchange is performed. When the heat exchanger 10 with fins is used as an evaporator and the heat exchanger 10 with fins is used as an evaporator, the auxiliary heat exchanger 70 is used as an inlet side of the refrigerant flow passage and is inserted into the fins of the auxiliary heat exchanger 70. The refrigerant is configured to flow through the heat transfer tube in one path.

With this configuration, when the finned heat exchanger 10 is used as a condenser, the refrigerant can be sufficiently subcooled and the condenser performance can be improved, and the ventilation of the heat exchanger as a whole can be improved. Since the difference in resistance can be reduced and the wind speed distribution can be improved, it is possible to improve the air volume at the same noise and to exhibit excellent performance.

  In the present embodiment, the outer diameter of the heat transfer tube used for the auxiliary heat exchanger 70 is set to the straight upwind front edge of the fin 21 of the substantially U-shaped front side heat exchanger 20. Of the two regions sandwiched by the leeward trailing edge, the region far from the once-through fan 5, that is, the region sandwiched by the linear windward leading edge 23 and the linear leeward trailing edge 25, and the rear side heat Larger than the outer diameter of the three rows of heat transfer tubes 30 inserted in the region sandwiched between the straight upwind leading edge 42 and the straight downwind trailing edge 43 of the fin 41 of the exchanger 40, and substantially in a letter shape. Of the two regions sandwiched between the straight upwind front edges 22 and 23 and the straight downwind rear edges 24 and 25 of the fins 21 of the front heat exchanger 20, the region closer to the cross-flow fan 5 That is, in the region sandwiched between the straight windward leading edge 22 and the straight windward trailing edge 24 and the front heat exchanger 20. That curved is set equal to the outer diameter of the windward front edge 26 and a curved leeward trailing edge 27 and the heat transfer tube 31 inserted in two rows in the region between the.

  With this configuration, when the finned heat exchanger 10 is used as an evaporator, the pressure loss can be reduced and the heat exchanger capability can be improved.

  Further, in order to reduce the size of the indoor heat exchanger, when the refrigerant amount with the outdoor heat exchanger is unbalanced, when the finned heat exchanger 10 is used as a condenser, the auxiliary heat exchanger 70 receives liquid. It plays the role of a vessel, eliminates the imbalance of the refrigerant amount, and can generally reduce the size of the liquid receiver disposed in the outdoor unit.

  Further, in the finned heat exchanger 10 that requires high capacity, an auxiliary heat exchanger 70 may be further provided on the windward side of the straight windward front edge 42 of the fin 41 of the back side heat exchanger 40. .

  In this case, although the wind speed distribution tends to be somewhat worse, when the finned heat exchanger 10 is used as a condenser, it is possible to further ensure the refrigerant supercooling and improve the condenser capacity. And the outer diameter of the heat transfer tube used for the auxiliary heat exchanger 70 is determined by the straight upwind front edge and the straight downwind trailing edge of the fin 21 of the substantially U-shaped front side heat exchanger 20. Of the two regions sandwiched, the region far from the once-through fan 5, that is, the region sandwiched between the straight windward leading edge 23 and the straight windward trailing edge 25, and the fins of the rear heat exchanger 40 41. The front-side heat exchange having a substantially square shape larger than the outer diameter of the three rows of heat transfer tubes 30 inserted in a region sandwiched by 41 straight upwind edges 42 and straight downwind trailing edges 43. Straight upwind leading edges 22, 23 of the fin 21 of the vessel 20 and straight downwind trailing edge Out of the two regions sandwiched between 4 and 25, the region on the side close to the once-through fan 5, that is, the region sandwiched between the straight windward leading edge 22 and the straight windward trailing edge 24 and the front side heat It is set equal to the outer diameter of the heat transfer tubes 31 inserted in two rows in a region sandwiched between the curved upwind front edge 26 and the curved downwind rear edge 27 in the exchanger 20, and the optimum refrigerant flow path By configuring the above, it becomes possible to reduce pressure loss and improve the evaporation capacity, and to exhibit a larger heat exchange capacity as a whole.

  As described above, the present invention is not limited to the above-described embodiment, and can be implemented with various modifications.

  The heat exchanger with fins according to the present invention relates to improvement of the shape and dimensions of the fins in the heat exchanger, the dimensions of the heat transfer tubes and the arrangement, and in particular, can be applied to the indoor unit of an air conditioner, The present invention can also be applied to a device that exchanges heat between the refrigerant flowing in the heat transfer tube and the air flowing outside.

Sectional drawing of the indoor unit of the air conditioner carrying the heat exchanger with a fin concerning Embodiment 1 of this invention Side view of fin of heat exchanger with fin The figure showing the example of a refrigerant | coolant path | route structure at the time of applying the heat exchanger with a fin which concerns on Embodiment 1 of this invention to the low capacity | capacitance air conditioner which becomes the optimal operation efficiency with the cooling capacity of about 4.0 kW or less. The figure showing the example of a refrigerant | coolant path | route structure at the time of applying the heat exchanger with a fin which concerns on Embodiment 1 of this invention to the high capacity | capacitance air conditioner which becomes the optimal operation efficiency by the cooling capacity of about 4.0 kW or more. Sectional drawing of the indoor unit of the air conditioner carrying the heat exchanger with a fin concerning Embodiment 2 of this invention Sectional view of an indoor unit of an air conditioner equipped with a conventional finned heat exchanger (A) The schematic side view of the fin of the heat exchanger with a fin which shows the other example of the past (b) The schematic sectional drawing of the indoor unit of the air conditioner which mounts the heat exchanger with the fin The figure which shows the pipe diameter of the arrangement pitch of the heat exchanger tube in the heat exchanger with the fin

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Casing 3a, 3b Inlet 4 Outlet 5 Cross-flow fan 10 Heat exchanger with fin 11 Notch 12a, 12b, 12c Cutting hole 20 Front side heat exchanger 21 Fin 22, 23, 26 Upwind leading edge 24 , 25, 27 Downward trailing edge 30, 31 Heat transfer tube 40 Rear side heat exchanger 41 Fin 42 Upward leading edge 43 Downward trailing edge 50, 52a, 52b, 52c, 52d, 54a, 54b, 54c, 60, 62a, 62b , 62c, 62d, 62e, 62f, 64a, 64b, 64c, 64d Refrigerant path 51, 53, 61 Divider 70 Auxiliary heat exchanger X1 Distance between windward leading edge and leeward trailing edge X2 Windward leading edge and leeward trailing Distance from edge Y Distance between windward leading edge and leeward trailing edge

Claims (7)

It is a heat exchanger with fins mounted on an indoor unit of an air conditioner that constitutes a wind circuit from a casing provided with a suction port on the front side and an outlet on the lower side and a cross-flow fan accommodated in the casing. And
It is composed of a front side heat exchanger and a back side heat exchanger arranged in the middle of the wind circuit from the inlet to the once-through fan or in the middle of the wind circuit from the once-through fan to the outlet,
The front-side heat exchanger and the back-side heat exchanger are arranged in parallel at predetermined intervals, and a large number of fins through which gas flows, and the refrigerant flows through the fins inserted at substantially right angles. A plurality of heat transfer tubes, two straight windward front edges and two straight lines each having the same obtuse angle on the windward leading edge and the leeward trailing edge of the fins of the front heat exchanger A leeward trailing edge, a curved leeward leading edge connecting each of the leeward leading edge and the leeward trailing edge, and a curved leeward trailing edge. While forming in a letter shape,
The distance between the windward leading edge and the leeward trailing edge in the region on the side of the front heat exchanger fin close to the cross-flow fan is 15 to 35 mm, and is close to the cross-flow fan of the fin of the front heat exchanger The outer diameter of the heat transfer tube inserted in the region sandwiched between the side region and the curved upwind leading edge and the curved downwind trailing edge is 5 to 8 mm, and the direction along the main gas flow direction Two rows and one row are arranged in the row direction,
The distance between the straight windward front edge and the straight windward trailing edge in the region of the fin of the front side heat exchanger far from the cross-flow fan, and the windward side of the fin of the back side heat exchanger The distance between the front edge and the leeward rear edge is set to 20 to 30 mm, and the outer diameter of the heat transfer tube inserted in the region far from the cross-flow fan of the front heat exchanger and the fins of the rear heat exchanger 3 to 7 mm, the heat transfer tubes are arranged in three rows in the row direction along the main flow direction of the gas, and the outer diameter dimensions of the heat transfer tubes inserted into the fins of the front side heat exchanger and the back side heat exchanger The heat exchanger with fins characterized by comprising two types. Transmission of one type of outer diameter to the fins in the region near the cross-flow fan of the front-side heat exchanger and in the region sandwiched between the curved upwind leading edge and the curved downwind trailing edge. A heat pipe is inserted and used as a refrigerant inlet side when the finned heat exchanger is used as a condenser, and is used as a refrigerant outlet side when used as an evaporator, and the refrigerant flows in three paths. Then, a heat transfer tube having one outer diameter smaller than the heat transfer tube is inserted into the region of the front side heat exchanger far from the cross-flow fan and the fins of the rear side heat exchanger, and heat exchange with the fins is performed. When used as a condenser, it is used as a refrigerant outlet side. When used as an evaporator, it is used as a refrigerant inlet side, and the front side heat exchanger has a region far from the cross-flow fan, and a rear side. Upwind of heat exchanger One row of heat transfer tubes on the side is configured so that the refrigerant flows in one path, and two rows of heat transfer tubes on the leeward trailing edge side are configured so that the refrigerant flows in four paths, and the finned heat exchanger is used as a condenser. In this case, the refrigerant flows through the two heat transfer tubes on the leeward trailing edge side through the one heat transfer tube on the leeward leading edge side, and when the finned heat exchanger is used as an evaporator, 2. The finned heat exchanger according to claim 1, wherein the refrigerant flows through the two heat transfer tubes on the leeward trailing edge side through one heat transfer tube. Transmission of one type of outer diameter to the fins in the region near the cross-flow fan of the front-side heat exchanger and in the region sandwiched between the curved upwind leading edge and the curved downwind trailing edge. Insert a heat pipe and use it as a refrigerant inlet side when using the finned heat exchanger as a condenser, and use it as a refrigerant outlet side when using it as an evaporator, and the refrigerant flows in four paths Then, a heat transfer tube having one outer diameter smaller than the heat transfer tube is inserted into the region of the front side heat exchanger far from the cross-flow fan and the fins of the rear side heat exchanger, and heat exchange with the fins is performed. When used as a condenser, it is used as a refrigerant outlet side. When used as an evaporator, it is used as a refrigerant inlet side, and the front side heat exchanger has a region far from the cross-flow fan, and a rear side. Upwind of heat exchanger One row of heat transfer tubes on the side is configured so that the refrigerant flows through one path, and two rows of heat transfer tubes on the leeward trailing edge side are configured so that the refrigerant flows on six paths, and the finned heat exchanger is used as a condenser. In this case, the refrigerant flows through the two heat transfer tubes on the leeward trailing edge side through the one heat transfer tube on the leeward leading edge side, and when the finned heat exchanger is used as an evaporator, 2. The finned heat exchanger according to claim 1, wherein the refrigerant flows through the two heat transfer tubes on the leeward trailing edge side through one heat transfer tube. Of the two regions sandwiched between the linear windward leading edge and the linear leeward trailing edge of the fin in the front side heat exchanger, the heat transfer tube is inserted into the fin portion in the region far from the once-through fan. And the arrangement pitch of the three rows of the heat transfer tubes in the portion sandwiched between the straight portion of the windward leading edge and the straight portion of the leeward trailing edge of the fin in the rear side heat exchanger is 10.0 to 16.0 mm, In the side heat exchanger, the heat transfer tubes to be inserted into the fins in the region near the once-through fan are arranged in two and one row in the row direction along the main flow direction of the gas, and at right angles to the main flow direction of the gas. The finned heat exchanger according to any one of claims 1 to 3, wherein an arrangement pitch of the heat transfer tubes is set to 13.0 to 20.0 mm in a step direction as a direction. The shortest distance between the heat transfer tube and the windward leading edge or leeward trailing edge of the fin is 1.0 mm or more, and further, the distance between the leeward trailing edge of the front side heat exchanger closest to the once-through fan and the once-through fan is 10 mm or more. The finned heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger has a fin. When there is a temperature difference between the refrigerants flowing inside between two heat transfer tubes adjacent in the row direction and the row direction, the fins between the rows and between the rows of the two heat transfer tubes are roughly along the row direction and the row direction. The hole according to any one of claims 1 to 5, wherein a hole having an outer diameter of 3 to 6 mm is provided so as to be cut in a direction and completely cut from a front edge of the fin by post-processing. Finned heat exchanger. Of the two regions sandwiched between the straight windward leading edge and the straight leeward trailing edge of the fin in the front side heat exchanger, an auxiliary heat exchanger is installed on the windward side of the region far from the cross-flow fan. When the finned heat exchanger is used as a condenser, the auxiliary heat exchanger is disposed on the outlet side of the refrigerant flow path, and when the finned heat exchanger is used as an evaporator, the auxiliary heat exchanger is disposed. The refrigerant flow path is on the inlet side, and the heat transfer tubes inserted into the fins of the auxiliary heat exchanger are configured to flow the refrigerant in one path. Finned heat exchanger.