JP2008051347A - Expansion valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature type expansion valve reduced in its processing cost. <P>SOLUTION: A partitioning member 12 is inserted into a pipe 11 having a central portion 11b expanded with respect to a small-diameter portion 11a, and provided with a power element mounting hole on its side face, to partition the inside into an inlet for introducing a high-pressure refrigerant and an outlet for leading out a low-pressure refrigerant, and a valve portion is mounted on the partitioning member 12 in the direction approximately perpendicular to the axial direction of the pipe 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an expansion valve, and more particularly to a temperature type expansion valve that senses the temperature and pressure of a refrigerant at the outlet of an evaporator in a refrigeration cycle of a vehicle air conditioner and controls the flow rate of the refrigerant sent to the evaporator.

  A refrigeration cycle of a vehicle air conditioner generally includes a compressor that compresses a circulating refrigerant, a condenser that condenses the compressed refrigerant, a receiver that stores the refrigerant in the refrigeration cycle and separates the condensed refrigerant into gas and liquid. An expansion valve that squeezes and expands the separated liquid refrigerant and an evaporator that evaporates the refrigerant expanded by the expansion valve. As the expansion valve, for example, a temperature type expansion valve that senses the temperature and pressure of the refrigerant at the outlet of the evaporator and controls the flow rate of the refrigerant sent to the evaporator is used (see, for example, Patent Document 1).

This temperature-type expansion valve is called a block type, a rectangular block with a built-in valve part, and a power element that controls the valve part by sensing the temperature and pressure of the refrigerant returned from the evaporator And have. The block has four connection holes on its side, that is, a connection hole connecting a high-pressure pipe to which a high-temperature / high-pressure refrigerant is supplied from a receiver, and a low-temperature / low-pressure refrigerant expanded by this expansion valve is sent to the evaporator. It has a connection hole for connecting a low-pressure pipe, a connection hole for connecting a return pipe from the evaporator outlet, and a connection hole for connecting a pipe for returning the refrigerant that has passed through the expansion valve to the compressor. It has the function of a pipe joint. The block is screwed with a screw hole for screwing the power element to one end face in the longitudinal direction and an adjustment screw for adjusting the set value of the valve portion from the outside to the other end face. And a screw hole. These connection holes and screw holes are formed by cutting and screwing a solid block, respectively.
JP 2002-115938 A

  However, in the block type expansion valve, in addition to the connection hole for piping and the screw hole for the power element and adjustment screw, the space for accommodating the valve body and spring, the valve hole, and the temperature and pressure of the refrigerant are detected by the power element. Many cutting and threading operations such as a rod holding hole that transmits the valve to the valve body, a bolt through hole for fixing the pipe inserted into the connection hole, and a screw hole for the bolt fixing the mounting plate for fixing the pipe There was a problem that it was necessary and the processing cost was high.

  This invention is made | formed in view of such a point, and it aims at providing the expansion valve which reduced processing cost.

  In the present invention, in order to solve the above problems, an expansion valve having a power element that senses the temperature and pressure of the refrigerant and a valve unit that controls the flow rate of the refrigerant according to the sensed temperature and pressure of the refrigerant, A pipe having a mounting hole for attaching the power element, and a partition member inserted into the pipe to partition a refrigerant inlet and a refrigerant outlet, and the partition member in a direction substantially perpendicular to the axial direction of the pipe. An expansion valve is provided in which the valve portion is attached.

  According to such an expansion valve, the portion constituting the pipe joint is formed by an inexpensive pipe. Thereby, the cutting process with high processing cost can be made unnecessary.

  In the expansion valve of the present invention, the pipe joint portion that connects the high-pressure pipe and the low-pressure pipe to the evaporator is constituted by an inexpensive pipe that does not require expensive cutting, so that the machining cost can be greatly reduced. There is.

Since the power element is configured to sense the pressure at the refrigerant outlet, piping for sensing the pressure at the evaporator outlet becomes unnecessary, and the configuration can be simplified.
By making the partition member to which the valve portion is attached a resin molded product, it is possible to reduce the component cost because secondary processing such as cutting is unnecessary.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing the configuration of the expansion valve according to the first embodiment.
This expansion valve has a pipe 11 having a function of a pipe joint. The pipe 11 has a shape that is sequentially expanded from the right end to the left end in the figure, the small-diameter portion 11a at the right end constitutes a refrigerant inlet to which a high-pressure pipe is connected, and the central portion 11b is a housing in which the valve mechanism is accommodated. The large diameter portion 11c at the left end constitutes a caulking portion for joining to a low pressure pipe to the evaporator. In the central portion 11b of the pipe 11, an attachment hole into which the valve mechanism is inserted is opened in the upper part of the figure, and the periphery of the attachment hole extends in a cylindrical shape upward in the figure. The center portion 11b of the pipe 11 has a spring load adjusting surface 11d formed on the surface facing the mounting hole.

  A partition member 12 inserted from the large diameter portion 11c side is disposed in the central portion 11b of the pipe 11. The partition member 12 divides the inside of the pipe 11 into a high-pressure side and a low-pressure side. The partition member 12 is made of, for example, resin, and the high-pressure refrigerant inlet passage 13 and the low-pressure refrigerant outlet passage 14 are parallel to the axial direction of the pipe 11. And a mounting hole for the valve mechanism is formed in a direction substantially perpendicular to the axial direction of the pipe 11. The partition member 12 has a groove formed on the outer periphery of the inlet passage 13, and an O-ring 15 is fitted in the groove to seal the boundary between the high pressure side and the low pressure side. The partition member 12 inserted into the pipe 11 has a step portion between the small diameter portion 11a and the central portion 11b on the high pressure side as a stopper, and the low pressure side deforms the central portion 11b inward to form a protrusion 11e. And is fixed in the pipe 11.

  The valve mechanism is attached to the partition member 12 in a direction substantially perpendicular to the axial direction of the pipe 11. The valve mechanism includes a power element that senses the temperature and pressure of the refrigerant and a valve portion. The power element includes an upper housing 16 and a lower housing 17 formed by pressing a thick metal plate, and a diaphragm 18 made of a flexible thin metal plate arranged to partition a space surrounded by the upper housing 16 and the lower housing 17. And a diaphragm receiving plate 19 disposed on the lower surface of the diaphragm 18, and is constructed by welding the outer peripheral edges of the upper housing 16, the lower housing 17, and the diaphragm 18 all around. A room surrounded by the upper housing 16 and the diaphragm 18 is filled with a gas such as a refrigerant used in the refrigeration cycle, and the gas is sealed by welding the metal ball 20 to the filling hole of the upper housing 16. It constitutes a greenhouse.

  The valve portion includes an outer cylindrical body 21 that is integrally formed by deep drawing the central opening of the lower housing 17 and extends in the axial direction, and an inner cylindrical body that is press-fitted into the outer cylindrical body 21. 22 is a valve body. A screw thread is formed on the outer periphery of the outer cylindrical body 21 in the vicinity of the opening end and is screwed to the partition member 12. The inner cylindrical body 22 has an opening formed in a side portion corresponding to the inlet passage 13 of the partition member 12, and a lower end portion in the drawing is fixed to the partition member 12 by press-fitting. The inner peripheral edge of the lower end surface of the inner cylindrical body 22 in the figure constitutes a valve seat 23. A valve body 24 is arranged below the valve seat 23 in the drawing, that is, downstream of the valve seat 23 so as to be able to contact with and separate from the valve seat 23, and the flow direction of the refrigerant is made to coincide with the valve opening direction of the valve portion. Thus, the high-pressure refrigerant does not self-close due to fluctuations. The valve body 24 is also urged in the valve closing direction by a spring 25. The lower end of the spring 25 in the figure is received by a spring holder 26, and its axial position is changed by deforming the spring load adjusting surface 11d of the pipe 11 inward. That is, the spring load of the spring 25 is adjusted by the pushing amount of the spring load adjusting surface 11d, and thereby the set value at which the valve portion of the expansion valve begins to open is adjusted, so that the degree of superheat of the refrigerant at the evaporator outlet can be adjusted. I have to.

  In the inner cylindrical body 22, a shaft 27 for transmitting the displacement of the diaphragm 18 that changes in accordance with changes in the temperature and pressure of the refrigerant detected by the power element to the valve body 24 is held so as to be able to advance and retract in the axial direction. Yes. The shaft 27 is formed integrally with the valve body 24, has a reduced diameter at a position corresponding to the inlet passage 13, forms a refrigerant passage, and a top portion is loosely fitted to the diaphragm receiving plate 19. Further, the shaft 27 has a groove formed between the reduced diameter portion and the top portion, and an O-ring 28 is disposed in the groove, and the high-pressure refrigerant introduced into the inlet passage 13 is located below the diaphragm 18. I try not to leak into the room.

  Here, the outer diameter of the shaft 27 is formed to be substantially the same as the inner diameter of the valve seat 23, and high pressure refrigerant is introduced into the reduced diameter portion of the shaft 27. As a result, the high pressure acts in the valve opening direction on the valve body 24 and in the valve closing direction on the shaft 27 in the same manner, so that the high pressure is canceled and the valve body 24 The valve lift can be controlled almost only by the driving force of the power element.

  The shaft 27 is formed with a vent hole 29 penetrating in the axial position thereof, and the diaphragm receiving plate 19 is also formed with a vent groove 30 extending in the radial direction from a recess in which the shaft 27 is loosely fitted, and downstream of the valve portion. The power element can sense the low pressure on the side. In the temperature type expansion valve, the power element should sense the pressure of the refrigerant at the evaporator outlet. However, in this expansion valve, the pressure element senses the pressure on the downstream side of the valve portion, that is, the pressure at the evaporator inlet. I have to. This is because when the refrigerant exiting the expansion valve exits through the evaporator, the pressure loss in the evaporator is almost constant, and therefore the pressure obtained by subtracting the pressure loss from the pressure at the outlet of the expansion valve. This is based on the fact that it can be regarded as the refrigerant pressure at the outlet of the evaporator.

  The power element is fixed by screwing the outer cylindrical body 21 inserted through the mounting hole of the pipe 11 to the partition member 12, and the seal in the mounting hole surrounds the outer cylindrical body 21. This is done by the O-ring 31 provided. The O-ring 31 is supported by a washer 32 from the partition member 12. The washer 32 is partially fitted into the cylindrical partition member 12 so that the surface facing the O-ring 31 is a flat surface.

  The expansion valve configured as described above is used in a state where the upper housing 16 of the power element is in contact with the low pressure pipe returning from the evaporator to the compressor. The temperature of the refrigerant at the outlet of the evaporator is sensed by transferring heat to the upper housing 16 of the power element via the return low-pressure pipe. When the pressure of the temperature sensing chamber rises due to sensing the temperature of the high refrigerant, the power element is displaced by the diaphragm 18 to the valve part side, and when the pressure falls due to the condensation of gas in the temperature sensing chamber due to sensing the low temperature. The diaphragm 18 is displaced to the side opposite to the valve side. Similarly, when the diaphragm 18 senses a high refrigerant pressure through the vent hole 29 and the vent groove 30, the power element is displaced to the side opposite to the valve side, and when the diaphragm 18 senses a low pressure, Acts to displace. The displacement of the diaphragm 18 is transmitted to the valve body 24 via the diaphragm receiving plate 19 and the shaft 27, and opens and closes the valve portion. As a result, the expansion valve senses the temperature of the refrigerant at the evaporator outlet and the pressure corresponding to the pressure at the evaporator outlet and controls the flow rate of the refrigerant sent to the evaporator.

FIG. 2 is a cross-sectional view showing the configuration of the expansion valve according to the second embodiment. In FIG. 2, the same components as those shown in FIG.
This expansion valve is simplified in comparison with the expansion valve according to the first embodiment, the valve body and the partition member 12 are connected by press-fitting, and the refrigerant pressure at the outlet of the expansion valve is changed to a diaphragm. The structure of transmission to the lower 18 rooms is changed.

  First, the valve body 33 is integrally formed by deep drawing the center portion of the lower housing 17, and has a valve seat 23 on the lower end face in the drawing. The valve body 33 formed in this way is fixed to the partition member 12 by being press-fitted into the partition member 12. The partition member 12 is provided with a vent hole 34 communicating with a hole for press-fitting the valve body 33 in the vicinity where the washer 32 is provided, and a vent hole is also provided on a side surface of the valve body 33 corresponding to the vent hole 34. It has been drilled. Therefore, the pressure of the refrigerant in the outlet passage 14 of the expansion valve is such that the diaphragm 18 has a vent hole 34 in the partition member 12, a corresponding vent hole in the valve body 33, and a clearance between the valve body 33 and the shaft 27. It will be transmitted to the lower room. For this reason, the seal between the inlet passage 13 into which high pressure is introduced and the chamber below the diaphragm 18 is provided by a V-ring 35 provided around the shaft 27 between the inlet passage 13 and the vent hole of the valve body 33. Like to do.

  Further, in this expansion valve, the spring 25 urging the valve body 24 in the valve closing direction has a taper whose diameter on the side received by the spring holder 26 is larger than the hole diameter of the partition member 12 into which the valve body 33 is press-fitted. Since the spring is used, the partition member 12 cannot be assembled after being inserted into the pipe 11. Therefore, the spring 25 and the spring holder 26 are inserted together in a state of being incorporated in the partition member 12 when the partition member 12 is inserted into the pipe 11.

  FIG. 3 is a cross-sectional view showing the configuration of the expansion valve according to the third embodiment. 3, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the details thereof are omitted.

  The expansion valve according to the first and second embodiments includes a partition member 12 inserted into the pipe 11 and a valve mechanism including a power element and a valve portion in a direction perpendicular to the axis of the pipe 11. The difference is that the configuration is such that the valve portion is incorporated when the partition member 12 is inserted into the pipe 11 and then the power element is mounted in the mounting hole of the pipe 11.

  In this expansion valve, the partition member 12 forms a valve body. The partition member 12 is a resin molded product with a metal valve seat 23 inserted therein, and the low-pressure side surface facing the diaphragm receiving plate 19 is formed flat. As a result, an air passage 36 is formed between the curved pipe 11 and the flat surface of the partition member 12 so that the outlet passage 14 of the expansion valve communicates with the chamber below the diaphragm 18.

  The power element is attached by being inserted into the attachment hole of the pipe 11, and the space between the low pressure side of the expansion valve and the atmosphere is sealed by a D ring 37 fitted in the outer peripheral groove of the hub portion of the lower housing 17. Yes. This power element is fastened by a band 38. That is, the band 38 is formed in a U-shape so as to cover the outer periphery of the pipe 11, and a band plate in which an adjustment window is opened so that the spring load adjustment surface 11 d is exposed at the bent portion and the tip of the band plate And an annular base portion formed so as to receive the outer peripheral portion of the lower housing 17. The power element covers the outer peripheral portion and the annular base portion of the band 38 from above with a cylindrical coupling member 39 whose upper end portion is bent inward, and does not appear in the illustrated cross section, but is perpendicular to the plane of the drawing. The lower end portions of the connecting members 39 in the direction are respectively crimped inward so as to be coupled to the band 38, thereby preventing the power element from coming off the pipe 11.

  Further, since this expansion valve is configured to be inserted into the pipe 11 with the partition member 12 incorporating the valve portion, the shaft 27 can be a column-shaped partition member even when the valve body 24 is seated on the valve seat 23. The length is set so as not to protrude from the outermost peripheral surface of 12. For this reason, the diaphragm receiving plate 19 that transmits the displacement of the diaphragm 18 to the shaft 27 is extended to a position where the central portion contacts the upper end surface of the shaft 27.

FIG. 4 is a cross-sectional view showing the configuration of the expansion valve according to the fourth embodiment. 4, the same components as those shown in FIG. 3 are denoted by the same reference numerals and the details thereof are omitted.
This expansion valve has a configuration in which an evaporator-side reciprocating pipe is assembled to the expansion valve according to the third embodiment. That is, this expansion valve is joined by caulking the large diameter portion 11 c of the pipe 11 to the low pressure pipe 41 toward the evaporator 40, and the joining portion is sealed by the O-ring 42 and the backup ring 43. . The end of the low-pressure pipe 41 on the evaporator 40 side is fixed to the mounting plate 44 by expanding the pipe. The small diameter portion 11a of the pipe 11 is fixed to the mounting plate 45 by expanding the end portion thereof. Further, a low pressure pipe 46 for returning the refrigerant from the evaporator 40 to the compressor is arranged in parallel with the pipe 11 and the low pressure pipe 41 in contact with the upper housing 16 of the power element, and both ends thereof are fixed to the mounting plates 44 and 45, respectively. Has been.

  In this expansion valve, the power element is fixed to the pipe 11 by the band 38 and the coupling member 39. The coupling member 39 is not only a cylindrical member that fixes the half annular base of the band 38 by caulking, A pipe receiving portion 47 adapted to receive the low pressure pipe 46 is integrally provided. The pipe receiving part 47 has an arch shape on the low-pressure pipe 46 side of the cylindrical member. The low-pressure pipe 46 is fixed so as to be pressed against the upper housing 16 and the pipe receiving part 47 by a band 48 whose tip is hooked to the arch part of the pipe receiving part 47.

  In the expansion valve configured as described above, the mounting plate 45 is installed in a holder 51 that is arranged to penetrate the partition wall 50 that partitions the engine room and the passenger compartment. The pipe 11 and the low-pressure pipe 46 are opened so that the high-pressure pipe from the pipe and the low-pressure pipe to the compressor can be connected.

  The evaporator 40 has, for example, a configuration in which an inlet pipe 52 is integrally welded to the refrigerant inlet and an outlet pipe 53 is integrally welded to the refrigerant outlet. The expansion valve and the evaporator 40 are connected by fitting the low-pressure pipe 41 to the inlet pipe 52 of the evaporator 40 and the low-pressure pipe 46 to the outlet pipe 53 and attaching the mounting plate 44 to the evaporator 40 with bolts (not shown). This is done by fixing. The connection between the inlet pipe 52 and the low-pressure pipe 41 and the connection between the outlet pipe 53 and the low-pressure pipe 46 are sealed by O-rings 54 and 55, respectively.

  FIG. 5 is a cross-sectional view showing a configuration of an expansion valve according to the fifth embodiment. 5, the same components as those shown in FIGS. 2 and 4 are denoted by the same reference numerals, and the details thereof are omitted.

  This expansion valve has a configuration in which a reciprocating pipe on the evaporator side is assembled to the expansion valve according to the second embodiment, and is substantially the same configuration as the expansion valve according to the fourth embodiment. That is, the pipe 11 is joined by caulking the large diameter part 11 c to the bead part of the low-pressure pipe 41, and the joined part is sealed by the O-ring 42. The coupling member 39 for fixing the band 38 is integrally formed with a band latching portion 56, and a band 48 for latching the low-pressure pipe 46 in contact with the upper housing 16 of the power element is latched on the coupling member 39. I try to let them.

  6A and 6B are diagrams showing a configuration of an expansion valve according to a sixth embodiment, in which FIG. 6A is a central longitudinal sectional view thereof, FIG. 6B is a sectional view taken along the line aa in FIG. Is a side view. In FIG. 6, the same components as those shown in FIG.

  This expansion valve is a type in which a partition member 12 incorporating a valve portion is inserted into a pipe 11 as in the expansion valve according to the third embodiment, and a power element is attached to a mounting hole of the pipe 11. The relay pipe 57 for relaying the low-pressure pipe returning from the compressor to the compressor is assembled. That is, the relay pipe 57 that returns to the pipe 11 that accommodates the valve portion and relays the low-pressure pipe is arranged in parallel, and the mounting plates 58 and 59 are fixed to both ends of the pipe 11 and the relay pipe 57.

  The method of fixing the power element to the pipe 11 and the method of pressing the relay pipe 57 to the power element are the same as those employed in the expansion valve according to the fifth embodiment shown in FIG. That is, as best shown in FIG. 6B, the power element includes an annular base portion of a band 38 previously passed through the pipe 11 and an outer periphery of the power element inserted into the mounting hole of the pipe 11 through the annular base portion. These parts are fixed to the pipe 11 by connecting them with a connecting member 39. The relay pipe 57 is fixed in a state in which it is pressed against the power element by hooking the end of the band 48 on a band hooking portion 56 formed integrally with the coupling member 39.

  The mounting plate 58 is provided with a screw hole 60. The screw hole 60 is formed by inserting a high-pressure pipe from the receiver and a low-pressure pipe to the compressor into the pipe 11 and the relay pipe 57, and then attaching a mounting plate provided at an end of the high-pressure pipe and the low-pressure pipe to the mounting plate 58 with a bolt. It is for fixing. Similar screw holes are also provided in the mounting plate 59, although not shown. In this expansion valve, the spring load adjusting surface 11d directly receives the spring 25, and the spring holder is omitted.

  As described above, in the first to sixth embodiments, it has been described that the power element senses the refrigerant temperature at the outlet of the evaporator by making direct contact with the low pressure pipe returning from the evaporator to the compressor. However, in the expansion valve according to the first to third embodiments that does not include a portion corresponding to the return low-pressure pipe, a temperature-sensitive cylinder is attached to the power element, and the temperature-sensitive cylinder is returned from the evaporator to the compressor. The temperature of the refrigerant at the outlet of the evaporator may be sensed by contacting it.

It is sectional drawing which shows the structure of the expansion valve which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the expansion valve which concerns on 2nd Embodiment. It is sectional drawing which shows the structure of the expansion valve which concerns on 3rd Embodiment. It is sectional drawing which shows the structure of the expansion valve which concerns on 4th Embodiment. It is sectional drawing which shows the structure of the expansion valve which concerns on 5th Embodiment. It is a figure which shows the structure of the expansion valve which concerns on 6th Embodiment, Comprising: (A) The center longitudinal cross-sectional view, (B) is a sectional view taken on the line aa of (A), (C) is a side view. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Pipe 11a Small diameter part 11b Center part 11c Large diameter part 11d Spring load adjustment surface 11e Protrusion part 12 Partition member 13 Inlet path 14 Outlet path 15 O-ring 16 Upper housing 17 Lower housing 18 Diaphragm 19 Diaphragm receiving board 20 Metal ball 21 Outer cylinder Shaped body 22 Inner cylindrical body 23 Valve seat 24 Valve body 25 Spring 26 Spring holder 27 Shaft 28 O-ring 29 Ventilation hole 30 Ventilation groove 31 O-ring 32 Washer 33 Valve body 34 Ventilation hole 35 V-ring 36 Ventilation path 37 D-ring 38 Band 39 Connecting member 40 Evaporator 41 Low pressure piping 42 O-ring 43 Backup ring 44, 45 Mounting plate 46 Low pressure piping 47 Pipe receiving portion 48 Band 50 Bulkhead 51 Holder 52 Inlet piping 53 Outlet piping 54, 5 O-ring 56 band engagement portion 57 through pipe 58, 59 mounting plate 60 screw hole

Claims (19)

In an expansion valve having a power element that senses the temperature and pressure of the refrigerant, and a valve unit that controls the flow rate of the refrigerant according to the sensed temperature and pressure of the refrigerant,
A pipe having a mounting hole for attaching the power element to a side surface;
A partition member inserted into the pipe and partitioning the refrigerant inlet and the refrigerant outlet;
The expansion valve is attached to the partition member in a direction substantially perpendicular to the axial direction of the pipe.   2. The refrigerant outlet pressure according to claim 1, wherein a chamber closer to the valve portion than the diaphragm of the power element communicates with a refrigerant outlet, and a pressure of the refrigerant sensed by the power element is set as a pressure of the refrigerant outlet. Expansion valve.   2. The expansion valve according to claim 1, wherein the valve portion has a valve body disposed on the downstream side of the valve seat so that a flow direction of the refrigerant coincides with a valve opening direction.   The valve portion has a shaft that is formed integrally with the valve body and transmits changes in temperature and pressure of the refrigerant sensed by the power element to the valve body, and the diameter of the shaft and the diameter of the valve seat The expansion valve according to claim 3, wherein the pressure at the refrigerant inlet is canceled by substantially equalizing.   The expansion valve according to claim 1, wherein the partition member is provided with a seal member on an outer periphery on the refrigerant inlet side.   The pipe has a receiving surface of a spring that biases the valve body of the valve portion in a valve closing direction on a side facing the mounting hole of the power element, and the receiving surface is deformed inward to thereby The expansion valve according to claim 1, wherein a spring load adjustment surface capable of changing a spring load of the spring is configured.   The partition member is formed in a direction substantially perpendicular to the axial direction of the pipe, and is connected to the through hole from the refrigerant inlet side in a direction parallel to the axial direction of the pipe. A cylindrical resin molded article having an inlet passage formed so as to communicate with an outlet passage formed so as to communicate with the through hole from the refrigerant outlet side in a direction parallel to the axial direction of the pipe. The expansion valve according to claim 1.   The valve portion configured integrally with the power element has a configuration in which the valve portion is inserted into the partition member assembled at a predetermined position in the pipe through the mounting hole and coupled. The expansion valve according to claim 1.   The expansion valve according to claim 8, wherein the power element is screwed to the partition member across the pipe from the outside of the pipe.   The expansion valve according to claim 8, wherein the power element is press-fitted into the partition member across the pipe from the outside of the pipe.   The expansion valve according to claim 10, wherein the power element is fastened by a band covering an outer periphery of the pipe.   The attachment hole is provided with a seal member that seals between the pipe and the power element, and the seal member is supported by a washer partially fitted into the cylindrical partition member. The expansion valve according to claim 8.   The valve portion includes a valve body including an outer cylindrical body extending from a central opening of a housing on the valve portion side of the power element and an inner cylindrical body press-fitted into the outer cylindrical body. The expansion valve according to claim 8, wherein an end surface of the inner cylindrical body constitutes a valve seat.   The valve portion includes a valve body extending from a central opening of a housing on the valve portion side of the power element, and an end surface of the valve body constitutes a valve seat. 8. The expansion valve according to 8.   The said partition member which accommodated the said valve part is assembled | attached to the predetermined position in the said pipe, The said power element has the structure assembled | attached to the said attachment hole of the said pipe. Expansion valve.   The expansion valve according to claim 15, wherein the power element is fastened by a band covering an outer periphery of the pipe. A first low-pressure pipe having one end joined to an end of the pipe on the refrigerant outlet side;
A second low-pressure pipe arranged in contact with the power element on one end side;
A first mounting plate provided at the other end of the first low-pressure pipe and the other end of the second low-pressure pipe;
A second mounting plate provided at an end of the pipe on the refrigerant inlet side and one end of the second low-pressure pipe;
The expansion valve according to claim 1, further comprising:   The expansion valve according to claim 16, wherein the pipe and the first low-pressure pipe are joined by caulking at an end of the pipe on the refrigerant outlet side. A relay pipe arranged in parallel with the pipe and in contact with the power element;
A first mounting plate provided at an end of the pipe on the refrigerant outlet side and one end of the relay pipe;
A second mounting plate provided at an end of the pipe on the refrigerant inlet side and the other end of the relay pipe;
The expansion valve according to claim 1, further comprising:

Images