JP2004353862A - Double-seat valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturizable double-seat valve having simple construction for stabilizing highly accurate flow control. <P>SOLUTION: The double-seat valve comprises a flow path ranging over a lateral joint 15, a lateral hole 27, an intermediate chamber 26, a first valve port 21 and a lower joint 16, in sequence, and another flow path ranging over the lateral joint 15, the lateral hole 27, the intermediate chamber 26, a second valve port 22, an end chamber 25, an internal passage 34 and the lower joint 16, in sequence. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a double-seat valve, and more particularly to a double-seat valve for controlling a flow rate of a refrigerant in a refrigeration / refrigeration / air-conditioning / hot water supply cycle.

  As a motor-operated valve for controlling a refrigerant flow rate such as a refrigeration / refrigeration / air-conditioning / hot-water supply cycle, two valve ports are disposed on a valve housing on the same axis to face each other, and the two valve ports are formed in a valve body. There is a double-seat valve that is opened and closed by each part (for example, Patent Document 1).

  The double-seat valve can cancel (cancel) the valve opening / closing force due to the pressure difference between the valve upstream side and the valve downstream side acting on both of the two valve portions, and reduce the driving force required for valve opening / closing. It is suitable for a high-pressure, large-flow motor-operated valve such as a motor-operated valve used in a supercritical cycle using a carbon dioxide refrigerant or the like in which the refrigerant pressure on the high-pressure side becomes higher than the critical pressure of the refrigerant.

However, in the conventional double-seat valve, since the flow path for each valve port is formed in the valve housing, the valve housing becomes larger than the single-seat valve, and the flow path becomes complicated and the flow rate becomes unstable. Easy to become. In addition, the overall structure becomes complicated, the number of parts increases, operation failures easily occur, and the cost increases.
JP 2001-324443 A

  An object of the present invention is to provide a double-seat valve that has a simple structure, can stably perform high-precision flow control, and can be downsized.

  A double-seat valve according to the present invention moves axially into a valve housing having a first inlet / outlet port and a second inlet / outlet port, a cylindrical member fixed to the valve housing, and a hollow portion of the cylindrical member. And a first valve port and a second valve port are formed concentrically on the same axis at a predetermined interval in the axial direction in the hollow portion of the cylindrical member. The hollow portion has an end chamber on one side of the second valve port, and an intermediate chamber between the other side of the second valve port and one side of the first valve port. Each defining and communicating with the second inlet / outlet port on the other side of the first valve port, wherein the cylindrical member has an axial direction between the first valve port and the second valve port. A lateral hole penetrating the intermediate position in the radial direction and communicating the intermediate chamber with the first inlet / outlet port is formed. A first valve that extends axially across the end chamber, the second valve port, and the intermediate chamber, and opens and closes the first valve port by axial movement. It has a land portion, a second valve land portion that opens and closes the second valve port, and an internal passage that opens the end chamber to the second inlet / outlet port.

  According to the double-seat valve according to the present invention, the first inlet / outlet port → side hole → intermediate chamber → the first valve port → second inlet / outlet port and the first inlet / outlet port → side hole → intermediate chamber → a second valve port → an end chamber → an internal passage → another flow path formed by a second inlet / outlet port is formed, and the first valve land portion and the second valve are formed in accordance with the axial movement of the valve element. The opening degree of the first valve port and the second valve port changes at the same time by the land portion.

  The flow path of the first inlet / outlet port → side hole → intermediate chamber → first valve port → second inlet / outlet port has the same flow path configuration as the single seat valve, and the first inlet / outlet port → side hole → middle The flow path formed by the chamber → the second valve port → the end chamber → the internal passage → the second inlet / outlet port is constituted by the internal passage of the valve body, so that the flow path in the valve housing as a double-seat valve is formed. The configuration is simplified, and the size of the valve housing can be reduced. Also, the valve body only forms the hollow internal passage, and the structure and shape are not complicated.

  In the double-seat valve according to the present invention, the valve body has a valve stem extending toward the end chamber, and the cylindrical member extends the valve stem along an axial extension of the end chamber. A structure having a bearing hole for movably supporting in the direction, and also serving as a valve seat member and a valve body support member can be provided. Thereby, the number of parts is reduced, and concentricity between the valve port and the bearing hole is also guaranteed.

  In order to achieve the above object, a double-seat valve according to the present invention includes a valve housing having a first inlet / outlet port and a second inlet / outlet port, and is movable in an axial direction with respect to the valve housing. The valve housing is provided with a first valve chamber directly communicating with the first inlet / outlet port, a second valve chamber, and a first valve chamber. A first valve port formed on one side and communicating with the second inlet / outlet port; and a first valve port formed on the other side of the first valve chamber and arranged on the same axis as the first valve port. A second valve port communicating with the second valve chamber, wherein the valve element extends axially across the first valve chamber and the second valve chamber; A first valve land that opens and closes the first valve port by directional movement; and a second valve land that opens and closes the second valve port. It has a valve land portion, and an internal passage for opening the second valve chamber to said second inlet and outlet ports.

  According to the double-seat valve according to the present invention, the first inlet / outlet port → the first valve chamber → the first valve port → the second inlet / outlet port and the first inlet / outlet port → the first inlet / outlet port. A second passage is formed by the valve chamber →→ the second valve port → the second valve chamber → the internal passage → the second inlet / outlet port, and the first valve land is moved in accordance with the axial movement of the valve element. The opening of the first valve port and the opening of the second valve port change simultaneously by the portion and the second valve land.

  The flow path from the first inlet / outlet port → the first valve chamber → the first valve port → the second inlet / outlet port has the same flow path configuration as the single seat valve, and the first inlet / outlet port → the first Of the valve chamber →→ second valve port → second valve chamber → internal passage → second inlet / outlet port, the main part of which is constituted by the internal passage of the valve body. The flow path configuration in the valve housing is simplified, and the size of the valve housing can be reduced. Also, the valve body only forms the hollow internal passage, and the structure and shape are not complicated.

  Further, the double-seat valve according to the present invention includes an electric motor such as a stepping motor, and a feed screw mechanism which is driven to rotate by the electric motor and converts a rotational motion of the electric motor into a linear motion. And the valve element are drivingly connected to each other, and the valve element is driven in the axial direction by the feed screw mechanism. Thereby, an electric double seat valve is obtained.

  Further, in the double-seat valve according to the present invention, the valve element is provided between the feed screw mechanism side and an opposite side of the feed screw mechanism opposite the first valve land portion and the second valve land portion. In each case, it is possible to adopt a structure in which the valve body is supported so as to be movable in the axial direction from the valve housing, and the swaying motion (vibration) of the valve body is enhanced.

  Further, in the double-seat valve according to the present invention, the first valve land portion is configured as a separate component from a valve body integrally having the second valve land portion. The valve body is fixedly mounted. Preferably, the first valve land portion is fixed to the valve main body by caulking in a state where the first valve land portion is threadably engaged with the valve main body so that an axial mounting position thereof can be adjusted.

  When the first valve land is configured as a separate component from the valve body integrally having the second valve land, the first valve land can be attached to the valve body by adjusting the mounting position of the first valve land. The fully closed state in which both the land portion and the second valve land portion are seated can be reliably obtained, and valve leakage is reduced or eliminated.

  According to the double-seat valve according to the present invention, the two-way flow path required for the double-seat valve is formed by the flow path configuration equivalent to the single-seat valve and the flow path configuration by the internal passage of the valve element. The flow path configuration in the valve housing is simplified, the size of the valve housing can be reduced, and the structure and shape of the valve body are not complicated only by forming a hollow internal passage.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 4 show a first embodiment of a double-seat valve according to the present invention.

  The double-seat valve according to the first embodiment is indicated by reference numeral 10 as a whole. The double seat valve 10 has a valve housing 11. The valve housing 11 has a first inlet / outlet port (inlet port) 12, a second inlet / outlet port (outlet port) 13, and a chamber 14.

  The first inlet / outlet port 12 is formed as a lateral hole, and a horizontal joint 15 is connected to the first inlet / outlet port 12. The second inlet / outlet port 13 is formed as a pilot hole, and the lower joint 16 is connected to the second inlet / outlet port 13. The chamber 14 has a lateral hole shape and directly communicates with the first inlet / outlet port 12.

  In the valve housing 11, upper and lower through holes 17A and 17B concentric with the second inlet / outlet port 13 are formed above and below the chamber 14, and the cylindrical member 20 is fitted and fixed in the upper and lower through holes 17A and 17B.

  The cylindrical member 20 is fitted into the upper and lower through holes 17A at the distal end portion 20A, directly communicates with the lower joint 16, extends vertically across the chamber 14, and is inserted into the upper and lower through holes 17B at the intermediate portion 20B. Mating. The cylindrical member 20 has a hollow shaft shape, and a first valve port 21 is provided by a first valve seat 23 and a second valve port 22 is provided by a second valve seat 24 in the hollow portion. They are formed concentrically at predetermined intervals in the direction. The second valve port 22 has a slightly larger port diameter than the first valve port 21 (a size through which a first valve land portion 31 described later can pass) for assembling the valve element.

  The hollow portion of the cylindrical member 20 has an end chamber 25 on one side (upper side) of the second valve port 22, and the other side (lower side) of the second valve port 22 and one side of the first valve port 21. Between the upper and lower sides (upper side), and communicates directly with the lower joint 16 (second inlet / outlet port 13) on the other side (lower side) of the first valve port 21. are doing.

  At a portion where the cylindrical member 20 crosses the chamber 14 up and down, a lateral hole 27 is formed to penetrate in the radial direction. The lateral hole 27 radially penetrates an intermediate position in the axial direction between the first valve port 21 and the second valve port 22, and passes through the intermediate chamber 26, the chamber 14, and the horizontal joint 15 (the first inlet / outlet port 12). ).

  Four horizontal holes 27 are formed in a cross at four rotation angles of 90 degrees. Accordingly, the positional relationship between the lateral hole 27 and the first inlet / outlet port 12 is hardly affected by the mounting position of the cylindrical member 20 in the circumferential direction with respect to the valve housing 11, and the circumferential relationship between the cylindrical member 20 and the valve housing 11 is reduced. It is not necessary to define the mounting position (positioning in the circumferential direction). Therefore, the cylindrical member 20 can be assembled to the valve housing 11 at an arbitrary circumferential position.

  The cylindrical member 20 has first and second bearing holes 28 on an axial extension (upper side) of the end chamber 25 for supporting a valve shaft portion 33 of the valve body 30 described later so as to be movable in the axial direction (vertical direction). Are formed concentrically with the valve ports 21, 22. As a result, the cylindrical member 20 is a single component, and also serves as a valve seat member and a valve body support member.

  A rod-shaped valve body 30 is arranged in the hollow portion of the cylindrical member 20 so as to be movable in the axial direction. The valve body 30 extends in the axial direction across the end chamber 25, the second valve port 22, and the intermediate chamber 26, and has a solid shaft shape (round bar shape) extending toward the end chamber 25 (upper side). The valve shaft 33 is integrally provided, and is supported by the cylindrical member 20 by fitting the valve shaft 33 into the bearing hole 28 of the cylindrical member 20 so as to be movable in the axial direction. By this fitting, the valve body 30 is supported via the cylindrical member 20 so as to be movable in the axial direction with respect to the valve housing 11.

  The valve body 30 has a conical first valve land portion 31 that opens and closes the first valve port 21 by axial movement, and a conical second valve opening and closing the second valve port 22 by the same axial movement. And a valve land 32.

  The distal end (lower end) of the valve body 30 faces the lower joint 16, and the valve body 30 is provided with a drilled hole 34 </ b> A having a bottom from the distal end, and at a portion where the valve body 30 is located in the end chamber 25. Has a lateral hole 34B penetrating in the radial direction. Thus, the drill hole 34A and the lateral hole 34B form an internal passage 34 that opens the end chamber 25 to the lower joint 16 (the second inlet / outlet port 13). In addition, four horizontal holes 34B are also formed in a cross at each rotation angle of 90 degrees.

  An upper portion 20C of the cylindrical member 20 protrudes from an upper portion of the valve housing 11, and a lower lid member 35 is fixed to this portion concentrically with the cylindrical member 20. The rotor case 41 of the stepping motor 40 is butt-welded to the lower lid member 35 in an airtight manner. The rotor case 41 has a can shape having a cylindrical portion 41A and a hemispherical dome portion 41B integrally formed with the cylindrical portion 41A and closing the upper end of the cylindrical portion 41A, and is entirely made of nonmagnetic material such as stainless steel having the same thickness. It is composed of the body.

  A rotor 42 is rotatably arranged inside the cylindrical portion 41A of the rotor case 41. The outer periphery of the rotor 42 is multipolar magnetized. A cylindrical female screw member 43 is fixed to the center of the rotor 42. The female screw member 43 and the rotor 42 are relatively rotatably connected to the upper end 33A of the valve body 30 by a connecting member 44, a fixing member 45, a collar member 46, a spring 47, and the like.

  A male screw member 36 is concentrically fixed to the upper end portion 20D of the cylindrical member 20. The male screw member 36 has a hollow shaft shape, and the valve shaft portion 33 of the valve body 30 passes through the hollow portion 36A. A male screw 36B is formed on the outer peripheral surface of the male screw member 36, and the male screw 36B is screw-engaged with a female screw 43A formed on the inner peripheral surface of the female screw member 43. The rotation of the rotor 42 is converted into a linear motion by this screw engagement.

  A stator assembly 48 of the stepping motor 40 is positioned and mounted on an outer peripheral portion of the rotor case 42 by a locking piece 49. The stator assembly 48 has an outer case 50, upper and lower two-stage stator coils 51, a plurality of magnetic pole teeth 52, an electrical connector portion 53, and the like.

  A stopper holding rod 55 is suspended and fixed inside the hemispherical dome portion 41B. A spiral guide 56 is attached to the stopper holding rod 55, and a movable stopper 57 is engaged with the spiral guide 56.

  The movable stopper 57 is vertically kicked by the pin 58 attached to the rotor 42, and is guided by the helical guide 56 with the rotation of the rotor 42 to move vertically while turning. The movable stopper 57 contacts the stopper 59 at the lower end of the stopper holding rod 55 or the stopper 60 at the upper end of the spiral guide 56 to limit the rotation of the rotor 42 in the valve closing direction or the valve opening direction. .

  The stepping motor 40 rotates the rotor 42 by energizing the stator coil 51. When the rotor 42 rotates, the rotational movement of the rotor 42 is converted into a linear movement by the screw engagement between the female screw 43A and the male screw 36B, and the rotor 42 moves in the rotor case 41 in the axial direction (vertical direction). The axial movement of the rotor 42 is transmitted to the valve body 30, and the valve body 30 moves in the axial direction (vertical direction).

  Thus, the first valve land 31 of the valve element 30 adjusts the opening of the first valve port 21, and the second valve land 32 of the valve element 30 adjusts the opening of the second valve port 22. , And substantially the same flow control is performed in both the first valve port 21 and the second valve port 22.

  Under this flow control, the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → side hole 27 → intermediate chamber 26 → first valve port 21 → lower joint 16 (second inlet / outlet port 13) And the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → side hole 27 → intermediate chamber 26 → second valve port 22 → end chamber 25 → internal passage 34 → lower joint 16 (second A fluid such as a refrigerant flows through another flow path formed by the inlet / outlet port 13).

  The flow path by the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → side hole 27 → intermediate chamber 26 → first valve port 21 → lower joint 16 (second inlet / outlet port 13) is a single-seat valve. It has the same flow path configuration as the flow path, and has a horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → side hole 27 → intermediate chamber 26 → second valve port 22 → end chamber 25 → internal passage 34 → lower The flow passage formed by the joint 16 (the second inlet / outlet port 13) has a main portion formed by the internal passage 34 of the valve 30. Therefore, the flow passage in the valve housing 11 as a double-seat valve is simplified. The size of the valve housing 11 can be reduced. In addition, since the valve element 30 only needs to form the hollow internal passage 34, the structure and shape of the valve element 30 do not become complicated.

  In addition, since the cylindrical member 20 is a single component and also serves as a valve seat member and a valve body support member, concentricity between the first and second valve ports 21 and 22 and the bearing hole 28 is highly assured. In addition, the number of parts can be reduced.

  FIGS. 5, 6A and 6B show a second embodiment of a double-seat valve according to the present invention. In FIGS. 5 and 6, parts corresponding to FIGS. 1 to 4 are denoted by the same reference numerals as in FIG.

  A double-seat valve according to the second embodiment is indicated by the reference numeral 100 as a whole. The double seat valve 100 has a valve housing 101. The valve housing 101 includes a first inlet / outlet port (inlet port) 102, a second inlet / outlet port (outlet port) 103, a lower valve chamber (first valve chamber) 104, and an upper valve chamber (first valve chamber). 2 valve chambers) 105 are formed.

  The first inlet / outlet port 102 is formed as a lateral hole, and a horizontal joint 106 is connected to the first inlet / outlet port 102. The second inlet / outlet port 103 is formed as a pilot hole, and the lower joint 107 is connected to the second inlet / outlet port 103.

  The lower valve chamber 104 has a lateral hole shape and directly communicates with the first inlet / outlet port 102. A first valve port 108 communicating with the second inlet / outlet port 103 is formed in a lower bottom surface portion of the lower valve chamber 104. A second valve port 109 communicating with the upper valve chamber 105 is formed on the upper surface of the lower valve chamber 104.

  The first valve port 108 and the second valve port 109 are concentrically arranged on the same axis, are above and below the lower valve chamber 104, and face each other. In this embodiment as well, the second valve port 109 has a slightly larger port diameter than the first valve port 108 (a size through which a first valve land portion 31 to be described later can pass) for assembling the valve element. ing.

  A valve shaft guide member 110 also serving as a fixture for the male screw member 36 is caulked and fixed to an upper portion of the valve housing 101. The valve shaft guide member 110 supports the valve shaft portion 33 of the valve body 30 movably in the axial direction by a bearing hole 111 formed at the center. Thus, the valve body 30 is supported by the valve housing 101 via the valve shaft guide member 110 so as to be movable in the axial direction.

  The valve body 30 is equivalent to that of the first embodiment, extends across the first valve chamber 104, the second valve port 109, and the second valve chamber 105 in the axial direction, and moves the valve upward. The shaft 33 is integrally provided.

  The valve body 30 has a cylindrical first valve land portion 31 that opens and closes the first valve port 108 by axial movement, and a conical second valve opening and closing the second valve port 109 by the same axial movement. And a valve land 32.

  Also in this embodiment, the distal end (lower end) of the valve body 30 faces the lower joint 107, the valve body 30 is provided with a drill hole 34A having a bottom from the distal end, and the valve body 30 is connected to the upper valve chamber 105. A lateral hole 34B is penetrated in the radial direction in a portion located inside. Accordingly, the drill hole 34A and the lateral hole 34B form an internal passage 34 that opens the upper valve chamber 105 to the lower joint 107 (the second inlet / outlet port 103).

  The configuration of the stepping motor 40, the feed screw formed by the male screw member 36 and the female screw member 43, and the like are the same as those in the first embodiment, and therefore, description thereof will be omitted to avoid redundant duplication.

  Also in this embodiment, the first valve land portion 31 of the valve element 30 adjusts the opening of the first valve port 108 by moving the valve element 30 in the axial direction (vertical direction) by driving the stepping motor 40. At the same time, the second valve land 32 of the valve body 30 adjusts the opening of the second valve port 109, and the flow rate control is substantially the same in both the first valve port 108 and the second valve port 109. Is performed.

  Under this flow rate control, the flow through the horizontal joint 106 (first inlet / outlet port 102) → the lower valve chamber 104 → the first valve port 108 → the lower joint 107 (the second inlet / outlet port 103) The horizontal joint 106 (first inlet / outlet port 102) → lower valve chamber 104 → second valve port 109 → upper valve chamber 105 → internal passage 34 → lower joint 107 (second inlet / outlet port 103). A fluid such as a refrigerant flows through one flow path.

  The flow path by the lateral joint 106 (first inlet / outlet port 102) → lower valve chamber 104 → first valve port 108 → lower joint 107 (second inlet / outlet port 103) is equivalent to the flow path of the single seat valve. The horizontal joint 106 (first inlet / outlet port 102) → lower valve chamber 104 → second valve port 109 → upper valve chamber 105 → internal passage 34 → lower joint 107 (second inlet / outlet port) Since the main part of the flow path formed by the outlet port 103) is constituted by the internal passage 34 of the valve body 30, the flow path configuration in the valve housing 101 as a double-seat valve is simplified, and the size of the valve housing 101 can be reduced. Will be possible. In addition, since the valve element 30 only needs to form the hollow internal passage 34, the structure and shape of the valve element 30 do not become complicated.

  A supercritical cycle using a carbon dioxide refrigerant or the like requires an ultra-high pressure, a large flow rate, and a double valve structure with a double seat valve in order to satisfy the conditions of low valve leakage. The ultra-high pressure acting on the valve body 30 can be canceled (pressure balance) with the same diameter as much as possible, and the upper valve (second valve land 32) and lower valve (first valve land 31) are correctly It is necessary to sit down.

  Further, even when the valves are open, it is required that the flow characteristics (valve lift amount-flow characteristics) at the two valve ports be the same and the pressure balance be maintained. Therefore, in the second embodiment, as shown in FIG. 6, the shapes (straight and tapered) of the first valve land 31 and the second valve land 32 of the valve body 30, and The shapes (taper and straight) of the valve port 108 and the second valve port 109 are individually set to achieve the same flow characteristics at the two valve ports.

  FIGS. 7, 8 (a), (b) and FIG. 9 show a third embodiment of a double-seat valve according to the present invention. In FIGS. 7 to 9, portions corresponding to FIGS. 1 to 5 are denoted by the same reference numerals as those in FIG. 1, and description thereof will be omitted.

  In this embodiment, a cylindrical lower extension valve shaft portion 37 is integrally formed on the lower end side of the valve body 30. The lower extension valve shaft portion 37 passes through the center of the second inlet / outlet port 103 in the axial direction (vertical direction).

  A lower valve shaft guide member 112 is fixed to the valve housing 101 together with the lower joint 107. The lower valve shaft guide member 112 supports the lower extension valve shaft portion 37 of the valve body 30 so as to be movable in the axial direction by a bearing hole 113 formed at the center.

  Thereby, the valve element 30 is supported on the upper side, that is, the feed screw mechanism side by the male screw member 36 and the female screw member 43 so as to be movable in the axial direction with respect to the valve housing 101 via the valve shaft guide member 110. In addition to the above, the lower side, that is, the side opposite to the feed screw mechanism, which is separated from the first valve land 31 and the second valve land 32, is connected to the valve housing via the lower valve shaft guide member 112. It is supported movably in the axial direction with respect to 101.

  Accordingly, the valve element 30 has a two-point support structure, and when the valve is opened, the valve element 30 is prevented from swaying and vibrating due to the fluid flowing in the valve housing 101, the flow rate control is stabilized, and the fluid passage noise is reduced. Will also be smaller.

  The lower valve shaft guide member 112 is provided with a plurality of through holes (through holes) 114 around the bearing hole 113 so as not to obstruct the flow of fluid in the lower joint 107.

  FIGS. 10, 11, and 12 show a fourth embodiment of a double-seat valve according to the present invention. 10 to 12, parts corresponding to those in FIGS. 1 to 5 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, the first valve land portion 31 is configured as a separate component from the valve body 120 having the second valve land portion 32 and the valve shaft portion 33 integrally. As a result, the valve body 30 includes the valve body 120 and the first valve land 31.

  The first valve land portion 31 is a cylindrical component, and has an internal thread 31A formed in the inner peripheral portion. A male screw 120 </ b> A is formed on the outer periphery of the valve land mounting portion of the valve body 120. A female screw 31A of the first valve land portion 31 is screw-engaged with the male screw 120A.

  With this screw engagement, the axial mounting position of the first valve land portion 31 with respect to the valve body 120 can be finely adjusted. This fine adjustment is performed by a first valve land portion 108A around the first valve port 108 and a valve seat portion 109A around the second valve port 109, where the axial separation distance is fixed. The distance is set so that both the first and second valve lands 32 are simultaneously seated (the distance between the first and second valve lands 31 and 32 in the axial direction).

  After the fine adjustment, the lower end portion 120B of the valve body 120 is swaged into the swaging engagement recess 31B formed in the first valve land portion 31 so that the first valve land portion 31 is prevented from rotating to the valve body 120. Is done. In this embodiment, four caulking engagement recesses 31B are provided at 90 ° intervals. However, at least one caulking engagement recess 31B may be provided, and the shape of the caulking engagement recess 31B may be different. The shape is not limited to a semicircle, but may be a triangle or a square.

  As described above, the first valve land portion 31 is configured as a separate component from the valve body 120 having the second valve land portion 32 integrally, and the mounting position of the first valve land portion 31 with respect to the valve body 120 is adjusted. Accordingly, even if there is a manufacturing error in the axial separation distance between the valve seat portion 108A and the valve seat portion 109A, both the first valve land portion 31 and the second valve land portion 32 are fully closed. The state can be reliably obtained, and the amount of valve leakage can be eliminated or reduced.

  Since the first valve land portion 31 is configured as a separate component from the valve body 120 having the second valve land portion 32 integrally, the first valve land portion 31 is configured as a second A design that is larger than or equal to the valve seat member 109A around the port 109 is also possible.

FIG. 13 shows one embodiment of a hot water supply cycle apparatus using a CO ₂ refrigerant (carbon dioxide refrigerant) in which the double-seat valve 10 or 100 of the first or _{second, third,} or fourth embodiment is used.

This hot water supply cycle device is a heat pump type water heater, in which a CO ₂ refrigerant circulation path including a compressor 71, a gas cooler 72 corresponding to a condenser, an electric double seat valve 10 or 100, and an evaporator 73 is configured. Heat exchange occurs between the hot CO ₂ refrigerant passing through 72 and the cold water in hot water tank 74 to create hot water.

FIG. 2 is a cross-sectional view showing Embodiment 1 of the double seat valve according to the present invention. It is an expanded sectional view of an important section of Embodiment 1 of a double seat valve by this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is sectional drawing which shows Embodiment 2 of the double seat valve by this invention. (A), (b) is an expanded sectional view at the time of valve closing and valve opening of the principal part of Embodiment 2 of the double seat valve by this invention. It is sectional drawing which shows Embodiment 3 of the double seat valve by this invention. (A), (b) is an expanded sectional view at the time of valve closure and valve opening of the principal part of Embodiment 3 of the double seat valve by this invention. It is a top view of the lower valve shaft guide member used for the double seat valve of Embodiment 3. It is sectional drawing which shows Embodiment 4 of the double seat valve by this invention. It is an expanded sectional view of the important section of Embodiment 4 of the double seat valve by this invention. It is a bottom view of the valve element of the double seat valve of Embodiment 4. 1 is a block diagram showing one embodiment of a hot water supply cycle device using a CO ₂ refrigerant to which a double-seat valve according to the present invention is applied.

Explanation of reference numerals

Reference Signs List 10 double seat valve 11 valve housing 12 first inlet / outlet port 13 second inlet / outlet port 20 cylindrical member 21 first valve port 22 second valve port 25 end chamber 26 intermediate chamber 28 bearing hole 30 valve body 31st 1 valve land portion 32 second valve land portion 33 valve shaft portion 34 internal passage 36 male screw member 40 stepping motor 41 rotor case 42 rotor 43 female screw member 48 stator assembly 100 double seat valve 101 valve housing 102 first inlet / outlet Port 103 Second inlet / outlet port 104 Lower valve chamber 105 Upper valve chamber 108 First valve port 109 Second valve port 110 Valve shaft guide member 112 Lower valve shaft guide member 120 Valve body

Claims (7)

A valve housing having a first inlet / outlet port and a second inlet / outlet port;
A cylindrical member fixed to the valve housing;
A rod-shaped valve body disposed in the hollow portion of the cylindrical member so as to be movable in the axial direction,
A first valve port and a second valve port are formed concentrically on the same axis at predetermined intervals in the axial direction in the hollow portion of the cylindrical member,
The hollow portion defines an end chamber on one side of the second valve port and an intermediate chamber between the other side of the second valve port and one side of the first valve port. And communicating with the second inlet / outlet port on the other side of the first valve port,
A lateral hole is formed in the cylindrical member so as to radially penetrate an axially intermediate position between the first valve port and the second valve port to communicate the intermediate chamber with the first inlet / outlet port. And
A first valve land extending axially across the end chamber, the second valve port, and the intermediate chamber, and opening and closing the first valve port by axial movement; A second valve land that opens and closes the second valve port, and an internal passage that opens the end chamber to the second inlet / outlet port;
A double-seat valve characterized by the following:   The valve body has a valve stem extending toward the end chamber, and the cylindrical member supports the valve stem movably in the axial direction on an axial extension of the end chamber. 2. The double-seat valve according to claim 1, wherein the double-seat valve has a hole and serves as both a valve seat member and a valve body support member. A valve housing having a first inlet / outlet port and a second inlet / outlet port;
A rod-shaped valve body arranged to be movable in the axial direction with respect to the valve housing,
The valve housing includes a first valve chamber directly communicating with the first inlet / outlet port, a second valve chamber, and the second inlet / outlet port formed on one side of the first valve chamber. And a second valve formed on the other side of the first valve chamber and arranged on the same axis as the first valve port and communicating with the second valve chamber. Port and
A first valve land portion extending axially across the first valve chamber and the second valve chamber and opening and closing the first valve port by axial movement; A second valve land that opens and closes a second valve port, and an internal passage that opens the second valve chamber to the second inlet / outlet port;
A double-seat valve characterized by the following:   An electric motor, and a feed screw mechanism that is rotationally driven by the electric motor and converts a rotational motion of the electric motor into a linear motion. The feed screw mechanism and the valve element are drivingly connected to each other, and the feed screw mechanism is provided. The double-seat valve according to any one of claims 1 to 3, wherein the valve element is driven in the axial direction.   The valve body has an axial line with respect to the valve housing on each of the feed screw mechanism side and the opposite side of the feed screw mechanism opposite to the first valve land portion and the second valve land portion. The double-seat valve according to any one of claims 1 to 4, wherein the double-seat valve is supported so as to be movable in a direction.   The first valve land portion is configured as a separate component from a valve body integrally having the second valve land portion, and the first valve land portion is fixedly attached to the valve body. The double-seat valve according to any one of claims 1 to 5, characterized in that:   7. The double valve according to claim 6, wherein the first valve land portion is fixed to the valve main body by caulking in a state where the mounting position in the axial direction of the first valve land portion is threadably adjusted so as to be adjustable. Seat valve.

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