JPS6233288A - Heat exchanger in automobile cooling and heating unit - Google Patents

Abstract

PURPOSE:To provide a heat exchanger capable of being used for space cooling and space heating without lowering of its performance by separately forming two kinds of heat medium passages in tubes, passing a heat medium radiating heat through one of the passages and also passing an endothermic medium through the other, conducting heat-exchanging between these heat media and the outside air through fins, and conducting heat-exchanging between these mediums through a partitioning wall. CONSTITUTION:The heat exchanger 1 is formed in such a manner that a coolant passage 2 and a fluid passage 3 are formed within flat tubes 4 in a lateral direction in parallel by holding therebetween partitioning walls. In the coolant passage 2 is provided an inner wall 6 and in the fluid passage 3 is provided an inner wall 7. Both passages are respectively divided into a plurality of parts. The inner wall 6 of the coolant passage 2 is formed into a cross shape to facilitates the transfer of heat between the coolant and a working fluid of the fluid passage 3 and to increases the pressure resistance of the tubes 4. Such tubes 4 are made in zigzag manner and a large number of metal fins 8 are provided only at the portions of the coolant passage 2 so that the outside air passes in the width direction between the tubes 4. The space cooling and heating apparatus using the present heat exchanger can be switched over between the space cooling and the space heating by only opening and closing valves.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heat exchanger used in an air conditioning system for movement iI that cools and heats the inside of an automobile.

(Conventional technology) There is a hot water type car heater as a heating device for automobiles.
In addition, there is Katara as a cold molar system δ. The hot water type car heater described above circulates a portion of engine cooling water through a heat exchanger serving as a heater core, blows air to the heater core, and warms the air passing through the heater core with the heat of the cooling water to heat the interior of the car. It is. The heater core has a structure in which a plurality of corrugated fins are arranged between a plurality of tubes, header tanks are provided at both ends of the tubes, and these are brazed together. In addition, Katara uses a compressor to compress cold tofu into a high-temperature, high-pressure gas, and then molds this gas into a serpentine shape using extruded aluminum tubes with multiple fluid passages, and places fins between the seven parallel tubes. The refrigerant is cooled and liquefied by outside air using a heat exchanger that functions as a condenser (condenser), which is brazed.The liquid refrigerant returns to gas in an evaporator installed inside the car, and the heat of vaporization causes it to flow inside the car. It cools the air conditioner by taking away the heat from the air. The evaporator is also a heat exchanger, and like the condenser described above, a serpentine tube is provided with a large number of fins, a refrigerant is passed through the tube, and heat is exchanged between the refrigerant and the outside air via the fins.

<Problems to be solved by the invention> Conventionally, the heating system and the cooling system have been installed separately, which increases the cost of the equipment, and each heat exchanger takes up space inside the car or in the engine compartment, making it unwieldy. It's the economy.

In addition, conventional hot water type car heaters circulate part of the engine's cooling water through the heater core, so for a while after the engine starts when the cooling water has not yet warmed up, there is a lack of heat and the heating does not work. It is cold until the temperature of the cooling water rises, and in the case of a diesel engine, it takes more time to warm up, so it takes time to heat up and it is still cold.
In cold regions, the hot water type car heater alone does not provide enough heat, so an auxiliary heater is required.

Furthermore, by reversing the refrigerant circulation in a conventional car cooler, the condenser in the cooling system acts as the evaporator in the heating system, and the evaporator in the cooling system acts as the condenser in the heating bag, creating a heat pump type heating system. However, if the condenser in a conventional cooling system was simply used as an evaporator in a heating system, sufficient heat absorption (heating of the refrigerant) could not be achieved.
As a heating bag, it doesn't function well.

<Means for Solving the Problems> The present invention has been made in view of the above, and includes a large number of fins provided between the outer walls of a meandering tube to improve the connection between the heat medium passing through the tube and the outside air. In a heat exchanger that exchanges heat between tubes, two types of heat medium passages are formed individually in the tube, a heat medium that radiates heat is passed through one passage, and a heat medium that absorbs heat is passed through the other passage, and the fin In addition to exchanging heat with the outside air through the partition wall, the heat medium is also able to exchange heat with each other through the partition wall.

Function> Two types of heat medium can pass through the heat exchanger, and the S medium and the outside air exchange heat through the fins to cool or heat the heat medium. Furthermore, two types of heat medium passing through the heat exchanger exchange heat with each other through a partition wall in the tube, with one heat medium radiating heat and the other heat medium absorbing heat.

<Embodiment> To explain the heat exchanger according to the present invention with reference to the embodiment shown in the drawings, two types of heat medium, namely a refrigerant and a working fluid, pass through the heat exchanger l.

The heat exchanger 1 shown in FIG. 1 has a refrigerant passage 2 and a fluid passage 3 formed in a flat tube 4 in parallel with a partition wall 5 in the lateral direction. The refrigerant passage 2 is provided with an inner wall 6, and the fluid passage 3 is provided with an inner wall 7, so that both roads are divided into a plurality of parts. The inner wall 6 of the refrigerant passage 2 is cross-shaped to improve heat transfer between the refrigerant and the working fluid in the fluid passage 3 and to increase the pressure resistance of the tube 4. Such a tube 4 is made into a meandering shape, and a large number of metal fins 8 are provided between the tubes 4 so that outside air can escape in the radial direction.
is provided only in the refrigerant passage 2 portion. Further, protection plates 9 are provided on the top and bottom of the heat exchanger 1, and U-shaped protection frames 10 are provided on the left and right sides of the heat exchanger 1 to protect the sides of the fins 8 and the bent portions of the tubes 4, respectively. The tube 4 described above can be made by extrusion molding of aluminum or the like, and it is preferable to braze the tube 4 and the fins 8. Although not shown, both ends of the refrigerant passage 2 have an inlet and an outlet. The fluid passage 3 has an inlet and an outlet at both ends. The heat exchanger 1 as described above is installed at a location in the vehicle body where outside air can circulate well, for example, near the front grill in the engine compartment. The installation is done with the refrigerant passage 2 side in front so that air can escape from the refrigerant passage 2 side to the fluid passage 3 side. If installed in this way, cooling of the refrigerant by outside air will not be hindered.

FIG. 2 shows another embodiment of the present invention, in which a heat exchanger 11 includes a refrigerant passage 12 and a fluid passage 1 of a heat pipe.
3 and the tube 15 superimposed vertically with a partition wall 14 in between.
The tube 15 shown in the drawing uses a refrigerant passage 12 divided into a plurality of sections in the upper section; Although the fluid passages 13 of the heat vibrator are formed in the upper and lower stages, the fluid passages may be formed in the upper and lower stages, and the refrigerant passages may be formed in the lower stage.

The inner wall 16 provided in the refrigerant passage 12 of the tube 15 is also formed in the shape of a cross, which improves the exchange of heat between the refrigerant and increases the pressure resistance of the tube 15. Such tubes 15 are made into a meandering shape, and a large number of fins 17 are provided between the tubes 15 so that outside air can escape in the width direction. Further, protection plates 18 are provided on the top and bottom of the heat exchanger 11, and U-shaped protection frames 19 are provided on the left and right sides of the heat exchanger 11 to protect the sides of the fins 17 and the bent portions of the tubes 15, respectively. By configuring the refrigerant passage 12 on the upper side and the fluid passage 13 of the heat pipe on the lower side as described above, the heat of the working fluid is easily transmitted to the refrigerant, and the heat exchange effect of the refrigerant is improved. Although not shown, both ends of the refrigerant passage 12 serve as an inlet and an outlet, and both ends of the fluid passage 13 serve as an inlet and an outlet.

The heat exchanger according to the present invention is used in an automatic Ichikawa heating and cooling system as shown in FIG. This heating and cooling device has two circulation paths, one being the 18th exchanger 20 and the second heat exchanger 21.
A circulation path A connects the compressor 22 and the compressor 22, and a refrigerant circulates in this circulation path A. The other one is a circulation path B that connects the second heat exchanger 21 and the heat receiving part 24 wound around the outer circumference of the exhaust pipe 25 extending from the engine 23, and the working fluid is circulated in this circulation path B. do. The circulation path A and the circulation path B are in contact with each other in the twenty-eighth exchanger 21, and the heat exchanger 1 according to the present invention is used as the twenty-eighth exchanger 21.

The circulation path A is connected to the exit section 20° of the first heat exchanger 20 installed inside the vehicle, for example at the bottom of the dash board, and the exit section 21i of the second heat exchanger 21 installed at a position with good air circulation, such as near the front grill. are connected by pipe P1, and the second
An outlet section 210 of the mature exchanger 21 and an inlet section 22 of the compressor 22. are connected by a pipe P2 via a valve 1, and the outlet section 22o of the compressor 22 and the first heat exchanger 2
0 inlet section 20. are connected by a pipe P3 via a valve V2, a pipe P4 is branched from the middle of the pipe P2, and the tip of the pipe P4 is connected between the outlet section 220 of the compressor 22 and the valve v2 via a valve V3, Further, a pipe P5 is branched from between the inlet portion 221 of the compressor 22 and the valve V1, and the tip of the pipe P5 is connected to the middle of the pipe P3 via the valve V4.

Then, both the valve v1 and the valve ■2 are opened,
When both valve ■3 and valve V4 are closed, the refrigerant is
As shown by → marks in FIG. 3, the first heat exchanger 20, the second
The heat exchanger 21, the compressor 22, and the 18th exchanger 20 are circulated in this order. On the other hand, when both the valve v1 and the valve V2 are closed and the valve v3 and the valve ■4 are both opened, the refrigerant will flow, regardless of the directionality of the compressor z2.
Contrary to the above, as shown by the marks in FIG.
The heat exchanger 20 is then circulated. Although four valves and a bypass circuit are provided in the drawing, a four-way valve may be used instead to simplify the piping.

On the other hand, the circulation path B has a heat-vib structure by connecting the heat receiving part 24 that receives high-temperature exhaust heat of the engine 23 and the second heat exchanger 21 with a pipe and evacuating it. Heat receiving part 2
4 is formed by wrapping the pipe material 26 around the exhaust pipe 25 or otherwise bringing it into contact with the exhaust pipe 25. The outlet side 240 of the heat receiving part 24 and the injection part 21'1 of the second heat exchanger 21 are connected by a pipe P6, and the outlet part 21' of the second heat exchange base 21 and the inlet side 241 of the heat receiving part 24 are connected. are connected by a pipe P7 via a shutoff valve V5. Therefore, in the circulation path B, if the shutoff valve 5 is opened, the working fluid of the heat pipe evaporates in the heat receiving part 24, enters the second heat exchanger 21N through the pipe P6, liquefies heat, and liquefies the heat in the pipe P7. It passes through and returns to the heat receiving section 24.

The operating principle of a heat pipe is that a wick layer with capillary action is formed within a metal tube, the inside of the tube is sealed under reduced pressure, and a working fluid is sealed in an amount sufficient to wet the wick layer. When a part of this heat pipe is heated as a heat receiving part, the liquid working fluid receives heat from the wall surface and evaporates, and moves to another low temperature part, that is, a heat radiating part, where it comes into contact with the cold wall surface, radiates heat, and condenses. It returns to a liquid state and returns to the heat-receiving section due to the capillary action of the wick layer, thereby transporting heat. Moreover, if the heat receiving part is set at a lower position than the heat radiating part, the liquefied working fluid will naturally fall, so the working fluid will flow back to the heat receiving part without forming a wick layer. Therefore, a wick layer may be formed on the entire pipe material forming the circulation path B to circulate the working fluid, or the heat receiving part 24 may be installed at a position δ lower than the second heat exchanger 21, The liquefied working fluid may fall naturally and return to the heat receiving ff1124.

On the other hand, as shown in FIG.
A large number of metal fins 29 are provided between the outer walls which are bent in a meandering manner to allow air to escape. An inner wall 30 is provided in the refrigerant passage 28 to divide the refrigerant passage 28 into a plurality of sections. Moreover, this inner wall 30 is formed in an H-shape,
This improves the heat transfer between the cold tofu and the tube 27, and increases the pressure resistance of the tube 27. In addition, the first mature exchanger 20
Protective plates 31 are provided at the left and right ends, and U-shaped protection frames 32 are provided at the top and bottom ends, respectively, to protect the side portions of the fins 29 and the bent portions of the tube 27. Is tube 27 like the one above aluminum? It is preferable that the fins 29 and the tube 27 are brazed together. Such a first S exchanger 20 is installed in the city, for example, at the bottom of a dash board.

To explain the heating effect of the air conditioning system using the heat exchanger for the unreleased IJ1 with reference to FIG. 3, the valve v1 in the circulation path A
and valve V2 are both opened, and valve v3 and valve v4 are opened.
When the compressor 22 is operated in this state, the refrigerant flows through the circulation path A in FIG. 3 from the first heat exchanger 20 to the second heat exchanger. to the heat exchanger 21, from the second heat exchanger 21 to the compressor 22
via 1st f! % exchanger 20, and the first heat exchanger 20 serves as a condenser for a heat pump type heating device.
The second heat exchangers fi21 each act as an evaporator. As soon as the engine 23 is started, exhaust heat is generated, and therefore, the working fluid in the heat vibrator of the circulation path B is evaporated in the heat receiving section 24 due to this exhaust heat, and flows to the second heat exchanger 21 on the low temperature side. This second heat exchanger 21 functions as an evaporator of a heat pump type heating device, and since the refrigerant is circulated, heat exchange is performed between the first working fluid and the refrigerant through the partition wall of the tube, and the second heat exchanger 21 operates as an evaporator. The fluid radiates heat and the refrigerant absorbs heat. The working fluid that has radiated heat is liquefied and returns to the heat receiving part 24 through the wick or by natural fall, and is vaporized again by the exhaust heat of the engine and resumes circulation.Meanwhile, it absorbs heat in the second heat exchanger 21. The vaporized refrigerant is compressed by the compressor 22 to become a high-temperature, high-pressure gas and is sent to the first heat exchanger 20. This first mature exchanger 20 acts as a condenser, and the refrigerant radiates heat to the surrounding air via the tubes 8 and fins 10 while passing through the refrigerant passage 9.
It heats the interior and liquefies it. The liquefied refrigerant returns to the second heat exchanger 21, where it is heated again by the exhaust heat of the engine transmitted through the loop path B and vaporizes, heating the interior of the vehicle while repeating this circulation.

On the other hand, to cool the inside of the car, valve V in circulation path A]
and valve V2 is closed, valve V3 and valve V4 are opened, and the first heat exchanger 20 on the indoor side acts as an evaporator of the cooling device, and the second heat exchanger 21 on the front side acts as a condenser. , the shutoff valve 5 in the circulation path B is closed to stop the circulation of the working fluid. When the compressor 22 is operated in this state, the refrigerant passes through the circulation path A in FIG. 3 from the first heat exchanger 20 to the pipe P3, and passes through the valve V4, the pipe P5, the compressor 22, and It enters the second heat exchanger 21 through valve V3, pipe P4, and pipe P2, and returns to the first mature exchanger 20 through pipe P1. The refrigerant is compressor 2
2, it is compressed and liquefied, cooled by outside air in a condenser, that is, a second heat exchanger 21 on the front side, and sent to an evaporator or first heat exchanger 20 on the indoor side. In this first heat exchanger 20, the refrigerant comes into contact with the warm air inside the car, and when the refrigerant vaporizes, it removes the heat from the air inside the car to cool the inside of the car.

The vaporized cold tofu is compressed and liquefied by the compressor 22 and sent to the second
The exhaust heat from the engine 23 is transmitted to the heat exchanger 21, cooled by outside air, and circulated repeatedly. At this time, the shutoff valve V5 is closed, so the exhaust heat from the engine 23 is transmitted to the second heat exchanger 21.
The cooling effect of the second heat exchanger 21, that is, the condenser, is not impaired.

In addition, in the second heat exchanger used in the present invention, the refrigerant passage and the working fluid passage may be formed in parallel in the horizontal direction, overlapped vertically, or the fluid passage may be placed above or below. The choice between the two can be made as appropriate, taking into consideration the space in the engine room, etc., but in order to improve heating performance, it is best to set the refrigerant passage at the top and the heat vibration fluid passage at the bottom. In order to improve cooling performance, it is best to arrange the refrigerant passages in parallel in the horizontal direction and set them in front of the vehicle in the direction of travel.In addition, each of the above-mentioned valves is a solenoid valve, and can be freely controlled from the driver's seat along with the compressor. can be operated.

<Effects of the Invention> In the heat exchanger according to the present invention, passages for two types of heat medium are individually provided, the two types of heat medium pass through the passages, and heat exchange is performed between the heat medium and the outside air. Not only that, but also the heat mediums can exchange heat with each other within the heat exchanger. Therefore, according to the present invention, it is possible to provide a heat exchanger that can be used for both cooling and heating, and does not have a drop in performance.

Moreover, the air conditioning system using the heat exchanger according to the present invention includes:
You can switch between heating and cooling simply by opening and closing the valve, and when heating, each acts as an evaporator.
During cooling, each can act as a condenser. Therefore, the air conditioning system using the heat exchanger of the present invention can be used as a cooling system in the summer and as a heating system in the winter, and there is no need to install a cooling system and a heating system separately, making it economical and It is miniaturized and the inside of the car or engine room can be used widely and effectively.

In addition, when the heat exchanger of the present invention is used in a heat pump type heating system, the exhaust heat of the exhaust gas, which becomes high temperature as soon as the engine is started, is transferred to the evaporator part of the heat pump type heating system, so refrigerant is efficiently transferred. The heating system is able to heat the vehicle without insufficient heat absorption in the evaporator part of the heat pump type heating system, and the heating system works effectively, heating starts immediately after the engine starts, the interior of the car is warmed immediately, and the engine starts. You can drive comfortably right after. Furthermore, the air conditioning system using the heat exchanger according to the present invention can also be used in conjunction with a conventional hot water type heating system. In this case, it is possible to compensate for the period immediately after the engine starts until the temperature of the cooling water is sufficiently raised, or it can be used in cold regions where conventional hot water type heating systems alone do not provide enough heat. It can supply enough heat to keep the inside of the car warm.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of a heat exchanger according to the present invention, FIG. 2 is a cutaway perspective view of another embodiment, FIG. FIG. 4 shows a cutaway perspective view of the first heat exchanger in the heating and cooling device L. ■, 12... Refrigerant passage 3.13... Fluid passage 4
．． 15...Tube 5.14...Partition wall 8.1
7...Fin applicant ■(Wa Aluminum Co., Ltd. representative)
Rinjin Fuku 1) Trust agent Rinjin Fuku 1) Nitsu...
l □゛・゛(shi)

Claims (3)

[Claims] (1) In a heat exchanger in which a large number of fins are provided between the outer walls of a meandering tube to exchange heat between the heat medium passing through the tube and the outside air, there are two types of heat inside the tube. Medium passages are individually formed, a heat medium that radiates heat is passed through one passage, and a heat medium that absorbs heat is passed through the other passage, and heat is exchanged with the outside air via fins, and the heat medium is exchanged with the outside air through a partition wall. 1. A heat exchanger for an automotive air-conditioning system, characterized in that heat exchange is possible using a heat exchanger. (2) In the air conditioning system for an automobile according to claim 1, wherein passages for two types of heat medium are formed laterally in parallel in the tube, and fins are provided only in the passage for one heat medium. Heat exchanger. (3) A heat exchanger in an automotive air conditioning system according to claim 1, wherein passages for two types of heat medium are formed vertically in the tube.