WO2004113725A1 - Flow path-switching valve, compressor with flow path- switching valve, and air conditioner for mounting on motor vehicle - Google Patents

Abstract

To achieve energy saving, structures of a compressor and a flow path-switching valve that are used for an air conditioner for mounting on a motor vehicle are simplified by reducing their piping etc. In a head case (11) of a compressor body (10) for mounting on a motor vehicle, a high-pressure space (sp1) and a low-pressure space (sp2) are formed by a dome-like partition wall (11A) and a ring-like partition wall (11B), respectively. An I joint pipe (11C1) and an O joint pipe (11C2) are integrally molded. A flow path-switching valve (20) is built-in in the high-pressure space (sp1). Inside a case body (21) of the flow path-switching valve (20) is received a main valve (22). A main shaft (24) penetrates through the case body (21), main valve (22), and a valve seat (23) and is screwed to the head case (11). A low-pressure port (23c) is connected to the low-pressure space (sp2) through a communication opening (11a). A first and a second switching port of the valve seat (23) are connected to the I joint pipe (11C1) and the O joint pipe (11C2). The high-pressure space (sp1) and a high-pressure space of the flow path-switching valve are communicated through a first path (21a) of the case body (21).

Description

 Specification

 Field switching valve, compressor with flow switching valve, and air conditioner for vehicle

 The present invention relates to a flow path switching valve suitable for being incorporated in a compressor such as a vehicle air conditioner, a compressor having the flow path switching valve having the flow path switching valve, and a compressor having the flow path switching valve. The present invention relates to a vehicle air conditioner having a compressor.

 ^ Scenic technology

 Conventionally, a flow path switching valve (four-way valve) has been used for switching a flow path of a refrigerant in a refrigeration cycle such as a cooling / heating unit. Examples of such a flow path switching valve include those disclosed in Japanese Patent Publication No. 35-12689, Japanese Patent Application Laid-Open No. 7-305916, and Japanese Patent Application Laid-Open No. 11-294336.

 [0003] The flow path switching valve disclosed in Japanese Patent Publication No. 35-12689 is configured such that, by energizing an electromagnetic coil provided outside the valve body, the three valve chambers inside the valve body have a central portion in which the valve body is disposed. One of the two valve chambers arranged on both sides of the valve chamber is selectively depressurized, and the differential pressure generated between the depressurized valve chamber and the central valve chamber causes the valve body to move inside the valve body. It is a slide.

 [0004] The flow path switching valve disclosed in Japanese Patent Application Laid-Open No. 7-305916 switches a flow path by rotating a valve body with a force electromagnetic coil (magnetic force switching unit 55) provided in a compressor. It is a thing.

 [0005] The passage switching valve disclosed in Japanese Patent Application Laid-Open No. H11-294336 is also provided in the compressor, but the valve 80 is rotated by an electromagnetic coil (coils of the electrode rods 94 and 95). , To switch the flow path.

[0006] The above-described flow path switching valve requires energization of the electromagnetic coil at the time of the valve switching operation, and thus has a problem in terms of environmental pollution, energy saving, and the like. On the other hand, according to the flow path switching valve proposed by the present applicant and disclosed in, for example, JP-A-2000-249430, it is possible to effectively prevent environmental pollution and save energy. Further, Japanese Patent Application Laid-Open No. 2000-249430 describes a compressor with a flow path switching valve (FIGS. 60 and 61). Patent Document 1: Japanese Patent Publication No. 35-12689

 Patent Document 2: Japanese Patent Application Laid-Open No. 7-305916

 Patent Document 3: JP-A-11-294336

 Patent Document 4: JP-A-2000-249430

 Disclosure of the invention

 Problems the invention is trying to solve

 [0007] The passage switching valve disclosed in Japanese Patent Publication No. 35-12689 requires wiring for leading a drive power supply to an electromagnetic coil or the like, and refrigerant leakage is likely to occur. Also, many pipes are required around the valve body (reverse valve 13). For this reason, there is a problem that this flow path switching valve is not suitable for being built in a compressor. In addition, the passage switching valve disclosed in Japanese Patent Application Laid-Open No. 7-305916 requires a suction pipe 45 and a gas-liquid separator 46 outside the compressor itself, but the piping of the passage switching valve itself is specially disclosed in Japanese Patent Publication No. It is less than that of the 12689 publication. However, wiring and the like for guiding the drive power supply are still required, and there is a problem that the flow path switching valve disclosed in Japanese Patent Application Laid-Open No. 7-305916 is not suitable for being built in a compressor. The same applies to the flow path switching valve disclosed in JP-A-11-294336.

 [0008] Further, in the compressor with a flow path switching valve disclosed in Japanese Patent Application Laid-Open No. 2000-249430, in the case of FIG. 60, a pipe connecting the pressure conversion chamber R2 and the suction pipe 6 is required. In this case, a pipe connecting the pressure conversion chamber R2 and the suction pipe 6 and a pipe connecting the pressure conversion chamber R2 and the high-pressure space 4c of the compressor body are required. That is, the flow path switching valve has a problem in that it is not completely built in the compressor and has a problem in that it saves space, and in particular, has a problem that it is not suitable for a vehicle-mounted air conditioner.

[0009] A vehicle-mounted compressor (compressor for a car air conditioner), such as a diaphragm compressor, which is driven by the rotating power of a vehicle-mounted engine has large vibration and impact. Attempts to incorporate a (four-way valve) have not been made. For example, when a conventional four-way valve, such as that disclosed in Japanese Patent Publication No. 35-12689, was mounted on a vehicle-mounted compressor, the design of vibration isolation was complicated. One of the causes was the presence of a drive unit that occupied 40% of the body weight, leading to an increase in vibration moment. In addition, the seismic design of electrical drive units such as electromagnetic coils must be strengthened. [0010] The present invention has been made in view of the above-described circumstances, and includes a flow path switching valve having no electric drive unit such as an electromagnetic coil incorporated in a compressor. The goal is to obtain a synergistic effect with the above and contribute to improving reliability, saving space, energy and resources.

 Means for solving the problem

 [0011] The flow path switching valve according to claim 1 of the present invention accommodates a valve body in a valve chamber so as to be slidable in the axial direction of the valve chamber and rotatable around the axis. The valve body is seated / separated with respect to the valve seat by an urging force for urging the valve body away from a valve seat disposed at one axial end of the valve chamber and the pressure of the refrigerant in the valve chamber. The valve body is rotated while being seated and the seating / separating operation is performed, and a low pressure port formed in the valve seat and two switching ports are formed by a conduction path formed in the valve body. In the flow path switching valve for switching the communication destination of the valve body, an opening is formed on the high pressure chamber side of the case body forming the valve chamber, and the high pressure chamber is communicated with the outside of the case body only by the opening. It is characterized by having done.

[0012] A flow path switching valve according to a second aspect of the present invention has the configuration according to the first aspect, wherein the opening is a through hole, and the through hole has a muffler function for a high-pressure refrigerant introduced into the high-pressure chamber. It is characterized by having.

 [0013] A flow path switching valve according to a third aspect of the present invention has the configuration of the first aspect, and separately from the urging force.

And a biasing means for biasing the valve body in a direction away from the valve seat from the valve seat to a position immediately before switching.

[0014] A flow path switching valve according to a fourth aspect of the present invention includes the configuration according to the third aspect, wherein the urging force and the urging force of the urging means move the conduction path of the valve body toward the valve seat. The valve body is urged at the position of the center of gravity of the low-pressure opening that opens to the valve.

[0015] A flow path switching valve according to claim 5 of the present invention has the configuration according to claim 3 or 4, and is characterized in that a spacing force between the valve body and the valve seat at the position immediately before the switching is Slmm or less. And

A flow path switching valve according to a sixth aspect of the present invention has the configuration according to the third aspect, wherein the conduction path penetrates the valve body in a substantially U-shape and corresponds to the low-pressure port and the switching port. Has an opening to

The urging means is provided between the openings.

[0017] A flow path switching valve according to a seventh aspect of the present invention includes the configuration according to the first aspect, wherein the conduction path includes The spacer is formed by inserting a spacer into a recess formed from the valve seat side of the valve body.

 [0018] The flow path switching valve according to claim 8 of the present invention accommodates a valve body in a valve chamber so as to be slidable in the axial direction of the valve chamber and rotatable around the axis. And the pressure of the refrigerant in the valve chamber in a direction away from the valve seat disposed at one axial end of the valve chamber.

The valve body is seated / separated from / to the valve seat, and the valve body is rotated in accordance with the seating Z-separating operation, and the valve seat is rotated by a conduction path formed in the valve body. In the flow path switching valve configured to switch the communication destination between the low pressure port and the two switching ports formed in the valve body, a passage communicating the high pressure chamber and the switching port is formed in the valve body, and the passage is formed. And a differential pressure valve operated by the pressure of the high-pressure refrigerant introduced into the high-pressure chamber.

 [0019] The compressor with a flow path switching valve according to claim 9 of the present invention accommodates a valve body in a valve chamber so as to be slidable in the axial direction of the valve chamber and rotatable around the axis. The valve body is seated on the valve seat by an urging force for urging the valve body in a direction away from a valve seat disposed at one end in the axial direction of the valve chamber and the pressure of the refrigerant in the valve chamber. The valve body is rotated in accordance with the operation of the seat / separate and the seating / separating, and the low pressure port and the two switching ports formed in the valve seat are formed by the conduction path formed in the valve body. A flow path switching valve for switching a communication destination of the compressor is mounted inside the compressor case, and two refrigerant inlet / outlet joints for guiding the flow path switching valve force to the outside of the compressor case are provided.

 [0020] A compressor with a flow path switching valve according to claim 10 of the present invention has the configuration according to claim 9, and further includes a high-pressure space into which high-pressure refrigerant is introduced by driving the compressor and a low-pressure space into which low-pressure refrigerant is introduced. A head case defining a space between the high-pressure space and the low-pressure space, the communication port being formed in a partition wall between the high-pressure space and the low-pressure space, and the two refrigerant inlet / outlet joints communicating with the high-pressure space side. An opening is formed in the case body forming the valve chamber on the high-pressure chamber side, and the high-pressure chamber and the outside of the case body are communicated only by the opening; The flow path switching valve is built in the high pressure space of the head case.

Connecting the high pressure chamber of the flow path switching valve with the high pressure space of the head case, and connecting the low pressure port of the valve seat of the flow path switching valve to the low pressure space of the head case via the communication port. And the switching port of the valve seat is connected to the refrigerant inlet / outlet joint. I do.

 [0021] A compressor with a flow path switching valve according to claim 11 of the present invention includes the configuration of claim 9, wherein the high-pressure space, the low-pressure space, and the refrigerant inlet / outlet joint of the head case are integrally formed. It is characterized by the following.

 [0022] A compressor with a flow path switching valve according to a twelfth aspect of the present invention includes the configuration of the ninth aspect, wherein the valve seat and Z or the case body of the flow path switching valve are formed integrally with the head case. The feature is.

 A compressor with a flow path switching valve according to a thirteenth aspect of the present invention includes the configuration according to the ninth aspect, wherein a main shaft of the flow path switching valve that penetrates the valve element has a valve seat of the flow path switching valve. And / or a case body is fastened and fixed to the head case.

 [0024] A compressor with a flow path switching valve according to claim 14 of the present invention includes the configuration of claim 9, further comprising a pressure sensor for detecting the pressure of the low-pressure space in the head case, and detecting the pressure by the pressure sensor. The flow path switching valve is controlled by pressure.

 [0025] A vehicle-mounted air conditioner according to claim 15 of the present invention is characterized by mounting the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13, or 14.

 [0026] A vehicle-mounted air conditioner according to claim 16 of the present invention includes the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13 or 14, and an electronically controlled expansion valve. And

 [0027] According to the flow path switching valve of claim 1 of the present invention, the valve is actuated by the urging force for urging the valve element away from the valve seat and the pressure (differential pressure) of the refrigerant in the valve chamber. The body is seated / separated and rotated relative to the valve seat to switch the communication between the low pressure port of the valve seat and the two switching ports. Further, an opening is formed in the case body forming the valve chamber, and the high pressure chamber communicates with the outside of the case body (the high-pressure space of the compressor) only by this opening. Therefore, the flow path switching valve does not require an electric drive unit such as an electromagnetic coil and the flow path switching valve can be easily built in the high-pressure space of the compressor. It reduces the number of pipes, simplifies piping, facilitates vibration-damping design, improves reliability, and saves energy, space and resources.

According to the flow path switching valve of claim 2 of the present invention, the same operation and effect as those of claim 1 are obtained, and since the opening is a through-hole, the through-hole is introduced into the high-pressure chamber. High pressure cooling Since it has a muffler function for the medium, noise due to pulsation of the discharged refrigerant can be reduced.

 [0029] According to the flow path switching valve of claim 3 of the present invention, the same operation and effect as those of claim 1 are obtained, and the valve body is separately provided from the valve seat to the position immediately before switching separately from the urging force. Since the urging means for urging the valve in the direction away from the valve seat is provided, mechanical noise and vibration when the valve body is seated can be reduced. In addition, it is also possible to easily separate the valve body.

 According to the flow path switching valve of claim 4 of the present invention, the same operation and effect as those of claim 3 can be obtained, and the valve body is moved away from the valve body at the center of gravity of the low pressure opening of the valve body. The valve body does not tilt when the valve body separates, and the valve body does not tilt.The deviation in the operation between the gap between the valve body and the case body and the frictional force does not occur. can do.

 According to the flow path switching valve of claim 5 of the present invention, the same operation and effect as those of claim 3 or 4 can be obtained, and at the same time, the gap force between the valve body and the valve seat at the position immediately before the switching is not more than Slmm. Therefore, the stroke in which a strong urging force is applied when the valve element separates is shortened. For example, when the cam groove and the pin rotate, the stress between the cam groove and the pin is suppressed to shorten the life. Can be reduced.

 According to the flow path switching valve of claim 6 of the present invention, the same operation and effect as those of claim 3 can be obtained, and between the openings of the conduction path in which the urging means is provided, a valve seat is provided. Since they are adjacent to each other, the urging means can be made smaller. For example, a small panel can be used.

 [0033] According to the flow path switching valve of claim 7 of the present invention, the same operation and effect as in claim 1 are obtained, and the conduction path of the valve element is formed by a concave portion formed from the valve seat side of the valve element. Since the spacer is formed by inserting a spacer into the conductive member, the conductive path can be easily formed.

[0034] According to the flow path switching valve of claim 8 of the present invention, the valve is actuated by the urging force for urging the valve body away from the valve seat and the pressure (differential pressure) of the refrigerant in the valve chamber. The body is seated / separated and rotated relative to the valve seat to switch the communication between the low pressure port of the valve seat and the two switching ports. Therefore, this flow path switching valve does not require an electric drive unit such as an electromagnetic coil and is suitable for being built in the high-pressure space of the compressor. Furthermore, since a passage formed in a valve body communicating the high-pressure chamber and the switching port is provided with a differential pressure valve that operates by the pressure of the high-pressure refrigerant introduced into the high-pressure chamber, the passage is closed by the differential pressure valve. Pressure in the high pressure chamber As a result, the valve body can be easily seated, and the differential pressure valve is opened by the pressure of the high-pressure chamber in the seated state of the valve body, and the pressure loss of the discharge flow path (high-pressure refrigerant flow path) in the valve is reduced. It can be almost zero. Therefore, the operation of the valve element can be ensured and reliability can be improved.

 [0035] According to the compressor with the flow path switching valve of claim 9 of the present invention, the flow path switching valve is mounted inside the compressor case, and the refrigerant inlet / outlet joint for guiding the flow path switching valve force out of the compressor case. Since the number of pipes is two, the piping around the compressor can be simplified and space can be saved. For example, a compressor with a flow path switching valve suitable for in-vehicle use is obtained.

 [0036] According to the compressor with the flow path switching valve of claim 10 of the present invention, the same operation and effect as those of claim 9 are obtained, and the high pressure space and the low pressure space are integrally formed by the head case. Can also be. In addition, since the head case is provided with a communication port for communicating the high-pressure space and the low-pressure space and two refrigerant inlet / outlet joints for communicating with the high-pressure space side, the flow path switching valve is provided within the high-pressure space of the head case. The high pressure chamber of the flow path switching valve communicates with the high pressure space of the head case through an opening formed in the case body of the flow path switching valve, and the low pressure port of the valve seat is connected to the communication port. It is connected to the low-pressure space of the head case through the air inlet, and the switching port of the valve seat is connected to the refrigerant inlet / outlet joint. Therefore, reliability can be improved and resources can be saved.

According to the compressor with the flow path switching valve of claim 11 of the present invention, the same operation and effect as those of claim 9 are obtained, and the high pressure space, the low pressure space, and the refrigerant inlet / outlet joint of the head case are integrally formed. Because it is formed, it is easy to manufacture and can improve reliability and save resources.

 [0038] According to the compressor with the flow path switching valve of the twelfth aspect of the present invention, the same effect as that of the ninth aspect can be obtained, and the valve seat and the Z or the case body of the flow path switching valve are attached to the head Since it is formed integrally with the case, the number of parts is reduced.

[0039] According to the compressor with the flow path switching valve of the thirteenth aspect of the present invention, the same operation and effect as in the ninth aspect are obtained, and the flow path is controlled by the main shaft penetrating the valve body of the flow path switching valve. The valve seat and / or the case body of the switching valve are tightened and fixed to the head case, which simplifies the mounting structure, facilitates production, improves reliability, and reduces maintenance. Improvement and recyclability can be achieved.

 [0040] According to the compressor with the flow path switching valve of claim 14 of the present invention, the same effect as that of claim 9 is obtained, and the pressure sensor detects the pressure in the low-pressure space and detects the pressure in the low-pressure space. Therefore, optimal refrigeration cycle control can be performed in cooperation with, for example, an electronically controlled expansion valve, thereby saving energy.

 According to the vehicle-mounted air conditioner of claim 15 of the present invention, the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13, or 14 is mounted. The same function and effect as those of the claims can be obtained.

 According to the vehicle-mounted air conditioner of claim 16 of the present invention, since the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13, or 14 is mounted, The same function and effect as those of the claims can be obtained. In particular, since the control of the electronically controlled expansion valve affects the pressure in the low pressure space of the compressor (particularly, the pressure detection of the low pressure space by the pressure sensor according to claim 14 and the electronic control) And energy saving.

 The invention's effect

 According to the flow path switching valve of claim 1 of the present invention, an electric drive unit such as an electromagnetic coil is not required, and the flow path switching valve is easily built in the high-pressure space of the compressor. Therefore, for example, the number of connecting pipelines is small and the piping is simple, so that the vibration isolation design is easy, and the reliability can be improved, and energy and space and resources are saved.

 According to the flow path switching valve of claim 2 of the present invention, the same effect as that of claim 1 can be obtained, and the noise due to the pulsation of the discharged refrigerant can be reduced by the muffler function.

 According to the flow path switching valve of the third aspect of the present invention, the same effect as that of the first aspect is obtained, and the urging for urging the valve element from the valve seat to the position immediately before switching is performed. By this means, mechanical noise and vibration when the valve element is seated can be reduced, and the valve element can be easily separated.

According to the flow path switching valve of claim 4 of the present invention, the same effect as that of claim 3 is obtained, and the valve body is moved away from the valve body at the center of gravity of the low-pressure opening of the valve body. The biasing force prevents the valve body from tilting when the valve body is unseated and prevents the valve body from tilting.Reduces variation in operation without biasing the gap between the valve body and the case body and generating frictional force. can do. According to the flow path switching valve of claim 5 of the present invention, the same effect as that of claim 3 or 4 can be obtained, and the stroke in which a strong biasing force acts when the valve element separates is shortened. For example, in the case where the cam groove and the pin are rotated, the stress between the cam groove and the pin can be suppressed, and the life degradation can be reduced.

 According to the flow path switching valve of claim 6 of the present invention, the same effect as in claim 3 is obtained, and a valve seat is provided between the openings of the conduction path in which the urging means is provided. Since it is adjacent to the device, the urging means can be reduced, and for example, a small panel can be used.

 According to the flow path switching valve of claim 7 of the present invention, the same effect as in claim 1 can be obtained, and the conduction path can be easily formed by the concave portion and the spacer.

 [0050] According to the flow path switching valve of claim 8 of the present invention, an electric drive unit such as an electromagnetic coil is not required, and is suitable for being built in a high-pressure space of a compressor. Further, the pressure loss of the discharge flow path (high-pressure refrigerant flow path) in the valve can be made almost zero by the differential pressure valve, and the operation of the valve body can be reliably performed to improve reliability.

 [0051] According to the compressor with the flow path switching valve of claim 9 of the present invention, the flow path switching valve is mounted inside the compressor case, and the refrigerant inlet / outlet joint for guiding the flow path switching valve force out of the compressor case. Since the number of pipes is two, the piping around the compressor can be simplified and space can be saved. For example, a compressor with a flow path switching valve suitable for in-vehicle use is obtained.

 According to the compressor with the flow path switching valve of claim 10 of the present invention, the same effect as in claim 9 can be obtained, and the high pressure space and the low pressure space can be integrally formed by the head case. . Also, since the head case is provided with a communication port for communicating the high-pressure space and the low-pressure space and two refrigerant inlet / outlet joints for communicating with the high-pressure space side, the flow path switching valve is connected to the high-pressure space of the head case. The high-pressure chamber communicates with the high-pressure space through the opening of the case body of the flow path switching valve, connects the low-pressure port of the valve seat to the low-pressure space, and connects the switching port of the valve seat to the refrigerant. The structure is simple to connect to the entrance joint, improving reliability and saving resources.

According to the compressor with the flow path switching valve according to claim 11 of the present invention, the same effect as in claim 9 is obtained, and the high pressure space, the low pressure space, and the refrigerant inlet / outlet joint of the head case are integrally formed. So that it is easy to manufacture, improves reliability, and saves resources. According to the compressor with the flow path switching valve of claim 12 of the present invention, the same effect as that of claim 9 can be obtained, and the valve seat and / or the case body of the flow path switching valve can be connected to the head case. Since they are formed integrally, the number of parts is reduced.

 According to the compressor with the flow path switching valve of claim 13 of the present invention, the same effect as that of claim 9 is obtained, and the valve seat and / or the case body of the flow path switching valve are tightened and fixed by the main shaft. As a result, the mounting structure is simplified, manufacturing is easy and reliability can be improved, and at the same time, maintainability and recyclability can be improved.

 According to the fourteenth aspect of the present invention, the same effect as in the ninth aspect is obtained, and the pressure sensor detects the pressure in the low-pressure space to control the flow path switching valve. Therefore, optimal refrigeration cycle control becomes possible in cooperation with, for example, an electronically controlled expansion valve, and energy is saved.

 According to the vehicle-mounted air conditioner of claim 15 of the present invention, the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13, or 14 is mounted. An effect similar to that of each claim can be obtained.

 According to the vehicle-mounted air conditioner of claim 16 of the present invention, since the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13, or 14 is mounted, An effect similar to that of each claim can be obtained. In particular, since the control of the electronically controlled expansion valve affects the pressure in the low pressure space of the compressor, the detection of the pressure in the low pressure space by the pressure sensor and the optimal control of the refrigeration cycle in cooperation with the electronically controlled expansion valve. And energy saving.

 BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a sectional view of a compressor with a flow path switching valve according to an embodiment of the present invention.

 FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and a diagram showing a refrigeration cycle of a vehicle-mounted air conditioner using the compressor with the flow path switching valve of the embodiment.

 FIG. 3 is a cross-sectional view showing details of a flow path switching valve and a bottom view of a main valve in the embodiment.

 FIG. 4 is a cross-sectional view taken along the line CC of FIG. 3 (B).

 FIG. 5 is a cross-sectional view taken along the line DD in FIG. 3 (B).

FIG. 6 is a view taken in the direction of arrows E in FIG. 3 (A). FIG. 7 is an enlarged development view of a cam groove in the embodiment.

FIG. 8 is a diagram illustrating another embodiment.

Explanation of reference numerals

 10 Compressor body

 20 Flow path switching valve

 30 Indoor heat exchanger

 40 Outdoor heat exchanger

 50 Electronic control expansion valve

 A Refrigeration cycle

 11 Head case

 11C1 I fitting pipe

 11C2 〇Fitting pipe

 spl high pressure space

 sp2 Low pressure space

 21 Case body

 21a 1st passage (through hole)

 22 Main valve (valve element)

 221 Cam groove

 22e Differential pressure valve

 22g recess

 22i spacer

 22k conduction path

 23 Valve seat

 23a 1st switching port

 23b Second switching port

 23c low pressure port

 24 spindle

24a pin 26 biasing means

 R1 1st valve chamber (high pressure chamber)

 R2 2nd valve room

 R3 3rd valve room

 BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of a compressor with a fluid control valve and a flow path switching valve and a vehicle-mounted air conditioner according to the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a compressor with a flow path switching valve according to an embodiment of the present invention, and FIG.

FIG. 2 is a view taken in the direction of arrow A and showing a refrigeration plant of a vehicle-mounted air conditioner using the compressor with the flow path switching valve.

 [0063] The compressor body 10 includes a head case 11, a valve seat 12, a cylinder block 13 and a front case 14, each having the same diameter, and a head is provided on one side of the cylinder block 13 via the valve sheet 12. The case 11 is attached, and the front case 14 is attached to the other end surface of the cylinder block 13. A drive shaft 15 and a rocking plate 16 are housed in the front case 14. One end of the drive shaft 15 is supported by a bearing 131 disposed at the center of the cylinder block 13, and the swing plate 16 is attached to the drive shaft 15 so as to be swingable. In the cylinder block 13, five cylinder bores 13a are formed around a bearing 131, and a piston 17 is provided in the cylinder bore 13a. The piston 17 is connected to the rocking plate 16 via a connection shaft 17a.

[0064] The head case 11 is made of metal and has a dome-shaped partition 11A bulged at the center, a ring-shaped partition 11B surrounding the periphery of the partition 11A, and extends radially from the partition 11A. Joint pipe 11C1 and O-joint pipe 11C2 are integrally molded. The head case 11 is fixed to the front case 14 together with the valve seat 12 by a member (not shown) in a state where the end faces of the partition walls 11A and 1IB are pressed against the valve seat 12. The inside of the partition 11A is a high-pressure space spl, and the inside of the partition 11B is a low-pressure space sp2. A communication port 11a is formed in the partition 11A between the high-pressure space spl and the low-pressure space sp2. Further, a sensor hole lib for mounting a pressure sensor 100 for detecting the pressure of the low-pressure space sp2 is formed in the partition wall 11B. Connect the I joint pipe 11 C 1 connected to the indoor heat exchanger 30 and the outdoor heat exchanger 40 The following joint pipes 11C2 are connected to the high-pressure space spl side, respectively.

[0065] The valve seat 12 is formed with a discharge hole 12a that communicates each cylinder bore 13a with the high-pressure space spl, and a suction hole 12b that communicates each cylinder bore 13a with the low-pressure space sp2. The discharge hole 12a is opened and closed by a discharge valve 18a disposed in close contact with the valve seat 12 on the high pressure space spl side, and the suction hole 12b is disposed in close contact with the valve seat 12 on the cylinder bore 13a side. It is opened and closed by the suction valve 18b.

With the above configuration, when the rotational power of the vehicle-mounted engine (not shown) is transmitted to the drive shaft 15 and the drive shaft 15 rotates, the swing plate 16 swings and the piston 17 moves forward and backward in the cylinder bore 13a. . Thereby, the suction of the refrigerant gas from the suction hole 12b and the discharge of the refrigerant gas from the discharge hole 12a are repeated, and the refrigerant gas becomes high pressure in the high-pressure space sp1 and low in the low-pressure space sp2. The pressure in the front case 14 is adjusted by a pressure adjusting valve (not shown) .As the pressure increases, the inclination angle of the swing plate 16 decreases, and the stroke of the piston 17 decreases, thereby decreasing the discharge capacity. I do. When the pressure in the front case 14 decreases, the inclination angle of the swing plate 16 increases as the pressure decreases, and the stroke of the piston 17 increases, thereby increasing the discharge capacity. As a result, the operating capability of the compressor body 10 is controlled.

The high-pressure space spl of the head case 11 houses the flow path switching valve 20 of the embodiment. Although a detailed portion is not shown in FIGS. 1 and 2, the flow path switching valve 20 accommodates a main valve 22 as a valve body inside a substantially cylindrical case body 21, and The open end of 21 is closed by a valve seat 23. Then, the main shaft 24 made of bolts penetrates the case body 21, the main valve 22 and the valve seat 23, and the thread portion 24 A at the tip of the main shaft 24 is screwed to the head case 11, whereby the flow path switching valve 20 is formed. Tightened and fixed. Further, as described later, the valve seat 23 has a first switching port 23a, a second switching port 23b (FIG. 2), and a low-pressure port 23c (FIG. 1). As shown in FIG. 1, a communication port 11a formed in the partition wall 11A is connected to the low-pressure port 23c, whereby the low-pressure port 23c is connected to the low-pressure space sp2 of the head case 11 via the communication port 11a. You. Further, as shown in FIG. 2, the first switching port 23a is connected to the I-joint pipe 11C1, and the second switching port 23b is connected to the O-joint pipe 11C2. That is, the I joint pipe 11C1 and the O joint pipe 11C2 are two refrigerant inlet / outlet joints. [0068] An electronically controlled expansion valve 50 is interposed between the indoor heat exchanger 30 and the outdoor heat exchanger 40, and includes a compressor main body 10, a flow path switching valve 20, and an indoor heat exchanger 30. The outdoor heat exchanger 40 and the electronically controlled expansion valve 50 constitute a heat pump refrigeration cycle A. The flow path of the cooling cycle A is switched between the cooling operation and the heating operation by the flow path switching valve 20, and during the cooling operation, the outdoor heat exchanger 40 is a condenser and the indoor heat exchanger 30 is an evaporator. It functions as an air conditioner. In the heating operation, the indoor heat exchanger 30 functions as a condenser and the outdoor heat exchanger 40 functions as an evaporator, and the vehicle interior is heated. The on-vehicle air conditioner equipped with the refrigeration cycle A is characterized in that the compressor body 10 has a built-in flow path switching valve 20, and other detailed parts not shown are the same as those of the conventional air conditioner. Therefore, the description is omitted.

 FIG. 3 (A) is a cross-sectional view showing the details of the flow path switching valve 20, and FIG. 3 (B) is a view of the main valve 22 in FIG. The state is shown. 4 is a cross-sectional view taken along the line C-C of FIG. 3 (B), FIG. 5 is a cross-sectional view taken along the line D-D of FIG. 3 (B), and FIG. 6 is a cross-sectional view taken along the line E-E of FIG. 3 (A). FIG. Note that the flow switching valve 20 in FIG. 3 (A) is shown upside down in FIG. 1, and in the description of the flow switching valve 20, the direction in FIG. The direction perpendicular to the main axis is defined as the radial direction.

 As shown in FIG. 3 (A), a slight gap is formed between the case body 21 and the main valve 22 housed therein, and the main valve in the case body 21 is formed. The space above 22 is the first valve chamber R1 as a high-pressure chamber. A first passage 21a (through hole) is formed near the upper end of the case body 21 as an opening. Thereby, the first valve chamber R1 (the high-pressure chamber of the flow path switching valve) and the high-pressure space spl of the compressor body 10 are communicated via the first passage 21a. At this time, the first passage 21a and the first valve chamber R1 function as a muffler for the refrigerant flowing into the first valve chamber R1 from the high-pressure space spl. Thereby, noise due to pulsation of the discharged refrigerant can be reduced. In the actual size, the diameter force of the case body 21 is S40 mm, and the diameter (φ) of the first passage 21a is 4 mm.

[0071] The main valve 22 has a substantially columnar shape, has a bearing 22A through which the main shaft 24 penetrates at the center, and has a high-pressure conducting portion 22B and a low-pressure conducting portion 22C around the bearing 22A. The main valve 22 is rotatable around the main shaft 24 and is movable in the direction of the rotating shaft (vertical direction in FIG. 3A). A main valve panel 25 for biasing the main valve 22 in a direction to separate the main valve 22 from the valve seat 23 is provided around the main shaft 24 below the shaft hole 22a of the bearing portion 22A. Further, a cam groove 221 to be described later is formed in the upper inner peripheral surface of the shaft hole 22a to be engaged with the pin 24a of the main shaft 24.

 [0072] In the high-pressure conducting portion 22B of the main valve 22, a vertical second passage 22b communicating with the first valve chamber R1 is formed, and further, a third passage 22c intersecting with the second passage 22b is formed. I have. In the high-pressure conducting portion 22B, a second valve chamber R2 as a high-pressure chamber communicated with the third passage 22c is formed in both sides of the second passage 22b and in the gap between the valve seat 23. A differential pressure valve 22e urged upward by a differential pressure valve panel 22d is provided in the second passage 22b, and a ring-shaped stopper 22f is provided near the upper end of the second passage 22b.

 [0073] A dome-shaped recess 22g that is flat in the radial direction is formed in the low-pressure conducting portion 22C, and a seating surface 22h that is seated on the valve seat 23 is formed at an end of the recess 22g on the valve seat 23 side. However, the seating surface 22h slightly protrudes from the end of the high-pressure conducting portion 22B on the valve seat 23 side. Further, a spacer 22i is provided in the recess 22g so as to approach the opening end (the seating surface 22h) of the recess 22g and to extend radially in the recess 22g. This forms a third valve chamber R3 as a low-pressure chamber between the spacer 22i and the valve seat 23, and penetrates the main valve 22 in a substantially U-shape as shown in FIG. In addition, a conduction path 22k having an opening 2 'corresponding to the low-pressure port 23c and the switching port 23a or 23b) is formed. The inside of the differential pressure valve 22e of the high-pressure conducting part 22B (the lower end of the second passage 22b) forms a fourth valve chamber R4, and the fourth valve chamber R4 and the above-mentioned conducting path 22k are pressure-equalizing holes. It is communicated by 22m.

[0074] The urging means 26 is provided on the spacer 22i. The urging means 26 is configured to fit a rod 26b into a through hole 26a formed in the spacer 22i, and urge the rod 26b toward the valve seat 23 by a rod spring 26c and a stopper 26d. . As shown in FIG.3 (B), the center axes of the rod 26b and the rod spring 26c are disposed so as to coincide with the center of gravity of the area of the opening of the recess 22g surrounded by the seating surface 22h. I have. Also, when the rod 26b projects maximum from the spacer _22i by the rod spring 26c, the distance (height) between the tip of the rod 26b on the valve seat 23 side and the seating surface 22h is less than lmm. I have.

Here, when the main valve 22 is about to be seated, the rod 26b contacts the valve seat 23, and the main valve 22 is unseated. When the rod 26b projects to the maximum, the tip of the rod 26b separates from the valve seat, and the position of the main valve 22 at the time of contact or separation is the "position immediately before switching". Then, the urging means 26 urges the main valve 22 in a direction of separating from the seated position of the main valve 22 to the position immediately before switching.

 As shown in FIG. 6, the first switching port 23a and the second switching port 23b are respectively provided at opposite positions on a concentric circle with the center of the valve seat 23 interposed therebetween. The low-pressure port 23c is provided at a position 90 ° away from the first and second switching ports 23a and 23b on a concentric circle with the first and second switching ports 23a and 23b. Note that the dashed-dotted line and the two-dot dashed line in FIG. 6 indicate a low-voltage conductive portion 22C and a conductive path 22k corresponding to a seating position described later.

 FIG. 7 is an enlarged development view of a cam groove 221 formed on the inner peripheral surface of the shaft hole 22a. The cam groove 221 is formed at two positions on the inner peripheral surface that are separated by 180 °. In the figure, the typical relative position of the pin 24a is shown by a solid line and an alternate long and short dash line. The cam groove 221 has a first stop portion 221a vertically formed on the first valve chamber Rl (high-pressure chamber) side, a first groove 221b curved and inclined following the first stop portion 221a, and a first groove 221b. A second stop portion 221c formed vertically from 221b to the valve seat 23 side, a second groove 221d curved and inclined following the second stop portion 221c, and a first valve chamber R1 from the end of the second groove 221d. It has a third stop 221e formed on the side. Further, following the third stop 221e, a third groove 221f inclined to a substantially central position of the cam groove 221, a fourth stop 221g formed at an end of the third groove 221f, and a fourth stop 221g are formed. It has a fourth groove 221h that continues to 1 stop 221a.

 [0078] Here, the upper end of the inclined surface 221b-l of the first groove 221b intersects the center axis of the first stop 221a, and the lower end of the inclined surface 221d-1 of the second groove 221d is the second stop. Crosses the central axis of 221c. The third stop 221e is opposed to the upper end of the inclined surface 22-1 of the third groove 22Π, and the lower end of the inclined surface 221h-1 of the fourth groove 221h is aligned with the central axis of the fourth stop 221g. Crossing. Therefore, when the main valve 22 (cam groove 221) moves up and down, the pin 24a follows the cam groove 221 as shown in (1) → (2) → (3) → (4) → (1) in FIG. Move and circulate repeatedly.

[0079] At the position (1), the seating state during the cooling operation shown in Fig. 3 (A) is set, at the position (2), the seating state is set, and at the position (3), the seating state during the heating operation is set. . The first stopping portion 221a and the third stopping portion 221e are formed at positions separated by 90 ° around the inner circumference of the cam groove 221 and have pins 24a. The main valve 22 is seated on the valve seat 23 at a reciprocating rotational position of 90 ° by the relative movement between the main valve 22 and the cam groove 221. In other words, the seating position during cooling operation and the seating position during heating operation are 90 ° apart.

 [0080] As a result, as shown by the dashed line in Fig. 6, during the cooling operation, the first switching port 23a and the low pressure port 23c are electrically connected by the conduction path 22k (and the third valve chamber R3) of the low pressure conduction section 22C. Is done. At this time, the second switching port 23b is connected to the first valve chamber R1 (high-pressure chamber) through the second valve chamber R2, the third passage 22c, and the second passage 22b. Further, as shown by a two-dot chain line in FIG. 6, during the heating operation, the second switching port 23b and the low pressure port 23c are conducted by the conduction path 22k (and the third valve chamber R3) of the low pressure conduction part 22C. . At this time, the first switching port 23a is connected to the first valve chamber R1 (high-pressure chamber) through the second valve chamber R2, the third passage 22c, and the second passage 22b.

[0081] Here, the pressure of the first valve chamber R1 pl, pressure _P 3 of the third valve chamber R3, a force main valve spring 25 biases the main valve f2, the rod spring 26c rod 26b Is assumed to be f3, and the cross-sectional area of the third valve chamber R3 (the area of the opening of the recess 22g surrounded by the seating surface 22h) is a3, so that (pi—p3) X a3> f2 + f3 Thus, f2 and f3 are set. If the cross-sectional area of the fourth valve chamber R4 in which the differential pressure valve 22e is accommodated is a4, and the force that the differential pressure valve panel 22d biases the differential pressure valve 22e is f4, then (pi—p3) X a4> f4 F4 is set so that Since the fourth valve chamber R4 communicates with the third valve chamber R3 through the equalizing hole 22m, the pressure in the fourth valve chamber R4 is always p3.

 Next, the operation of the flow path switching valve 20 will be described. When the compressor body 10 is stopped, pi (discharge pressure, condensing pressure) and p3 (suction pressure, evaporating pressure) begin to equalize. In order to speed up the equalization, the electronic control expansion valve 50 may be controlled to fully open the expansion valve.

 [0083] When equalization proceeds and (pl-p3) <(f2 + f3) Za3, main valve 22 separates from valve seat 23.

Then, the third valve chamber R3 is conducted to the second valve chamber R2, and the pressure equalization proceeds rapidly, and the main valve 22 is raised by f2. Thus, the relative position between the pin 24a and the cam groove 221 goes from (1) to (2). Along with the first valve chamber R1 pressure balance of the third valve chamber R3 (pl- _P 3 0), also rises in the second passage 22b by f4 differential pressure valve 22e, closing the third passage 22c.

Next, when the compressor body 10 is operated, the discharged refrigerant flows into the first valve chamber R1 from the first passage 21a of the case body 21, and the refrigerant in the third valve chamber R3 and the second valve chamber R2. To the compressor body 10 Inhaled. Since the third passage is closed by the differential pressure valve 22e, a pressure difference (pl_p3) is generated above and below the main valve 22, and (pi-p3) X al> f2. Therefore, the main valve 22 descends toward the valve seat 23. Here, al is the sectional area a2 + a3 of the main valve 22. At this time, the relative position between the pin 24a and the cam groove 221 shifts from (2) to (3). That is, the main valve 22 rotates by going through the ascending Z descending stroke, switching from the cooling position to the heating position, and the conduction path 22k of the main valve 22 is connected to the low pressure port 23c (S port) and the second switching port 23b. (O fitting tube).

Here, when the main valve 22 approaches the valve seat 23 when seated, when the rod b of the urging means 26 hits the valve seat 23 at the position immediately before switching and the force f3 acts, the first valve chamber R1 and the third valve With the increase of the differential pressure with the chamber R3 (second valve chamber R2), (pl_p3) X al> f2 + f3, and the main valve 22 is seated S. As a result, the second valve chamber R2 and the third valve chamber R3 are isolated, and the high-pressure refrigerant gradually flows into the second valve chamber R2 from the gap between the main valve 22 and the case body 21, When the differential pressure between the first valve chamber R1 and the third valve chamber R3 increases, (pl_p3) Xa3> f2 + f3, and the seat is held only by the differential pressure of a3. Further, since the fourth valve chamber R4 is in communication with the third valve chamber R3, the pressure in the fourth valve chamber R4 becomes low, (pl-p3) Xa4> f4, and the differential pressure valve 22e descends so that the third passage 22c is opened, and the first valve chamber R1 and the second valve chamber R2 are conducted. That is, the function of the differential pressure valve 22e is to drive the main valve 22, and when the driving is completed (seated), the pressure loss of the discharge flow path in the flow path switching valve 20 is reduced to zero. In addition to the above conditions, f4> a4X (f2 + f3) / a3 is set.

[0086] Here, the urging force f3 of the urging means 26 acts to alleviate the seating impact (seating speed) of the main valve 22 as well as to accelerate the separation of the main valve 22. In addition, the force f2 + f3 that urges the main valve 22 in the unseating direction is opposed to the force (pi-p3) Xa3 acting on the cross-sectional area of the third valve chamber R3. Act on the center of a3. Otherwise, a couple occurs in the main valve 22 and the gap between the main valve 22 and the case body 21 is biased, and a frictional force acts on the main valve 22 and the main shaft 24, so that the operation of the main valve 22 varies. However, these can be prevented. Further, the presence of the urging force of the urging means 26 and the securing of the gap between the main valve 22 and the case body 21 have the following effects. Since the refrigerant at the time of driving also flows through the gap between the main valve 22 and the case body 21, when the amount of circulation of the compressor body 10 is extremely small, the differential pressure acting on the main valve 22 becomes small, and the seat cannot be seated. ,. Therefore, in this case, the cooling capacity becomes zero, It will prevent rolling. Prevention of this gas shortage operation is further ensured by cooperating with pressure detection by the pressure sensor 100 (low pressure sensor).

 [0087] In the compressor body 10, the angle of the oscillating plate 16 is made variable to adjust the compression capacity, and the minimum capacity is made very small, so that a vehicle-mounted engine is directly connected to the compressor body. Since there is no seating in this case, the flow path switching valve 20 forms a so-called short circuit for the refrigerant, so that the generation of excess power is suppressed and the oil is prevented from flowing to the refrigeration cycle A side. be able to.

 Further, since the purpose of the urging force f3 of the urging means 26 is to conduct the second valve chamber R2 and the third valve chamber R3, the working distance (from the valve seat 23 to the position immediately before switching) is set. The distance) should be short, less than 1mm. If the working distance is too long, the lifting force of the main valve 22 is increased, so that the stress of the pin 24a and the cam groove 221 is increased, which leads to deterioration of the service life. However, since the working distance is short as described above, the life can be prevented from deteriorating.

 In order to recognize the switching of the main valve 22, it is preferable to monitor a change in the low pressure detected by the pressure sensor 100. That is, as the main valve 22 is unseated and seated, conduction between the second valve chamber R2 and the third valve chamber R3 opens and closes, and the low pressure changes abruptly. Then, since the refrigeration cycle A is controlled by using the low pressure and the electronic control of the electronic control expansion valve 50 together, a suitable cycle control can be obtained, and also an energy saving effect can be obtained.

 [0090] In principle, the urging means 26 may not be provided, but in the above embodiment, since the urging means 26 is provided, the above-described effects can be obtained. In this case, it is preferable to shorten the working distance of the urging means as described above. However, in the embodiment, since the spacer 22i is provided, the urging means 26 is provided near the opening of the recess 22g to shorten the working distance. can do. Furthermore, even if the spacer 2 is provided, a substantially U-shaped conduction path 22k penetrating the main valve 22 is formed, so that pressure loss in the conduction path 22 can be reduced and the valve seat 23 In addition to the gap between the low pressure port 23c and the switching port 23a (or 23b), the conduction between the low pressure port 23c and the switching port 23a (or 23b) can be ensured. In addition, such a structure is simple because only the spacer 22i is provided in the recess 22g.

[0091] Although the above-described embodiment is preferable, the urging means may be provided, for example, near the lower portion of the shaft portion 22A without being provided on the spacer. In addition, the U-shaped low pressure port and the switching port are conducted. The conductive path may be simply the concave portion 22g (a configuration without the spacer 22i).

In the above embodiment, the force for fastening the valve seat 23 and the case body 21 to the head case 11 by the main shaft 24 may be as shown in FIG. In FIG. 8, the elements corresponding to those in FIG. 1 are indicated by the same reference numerals as those in FIG. FIG. 8 (A) shows a case where the valve seat 23 and the case body 21 are formed integrally with the head case 11. FIG. 8 (B) shows the valve seat 21 formed integrally with the head case 11, and the case body 21 is fixedly fastened to the head case 11 (valve seat 21) with the main shaft 24. FIG. 8 (C) shows a case where the case body 21 is formed integrally with the head case 11 and the valve seat 23 is fixed to the head case 11 by the main shaft 24.

[0093] In the embodiment, the first passage 21a as the opening of the case body 21 is a through-hole, so that the force for obtaining the muffler function is sufficient. For example, as shown in FIGS. 8A and 8C, the shape without the upper half of the case body 21 may be used.

Claims

The scope of the claims  [1] A valve body is accommodated in a valve chamber so as to be slidable in the axial direction of the valve chamber and rotatable around the axis, and the valve body is disposed at one axial end of the valve chamber. The valve body is seated / separated from the valve seat by the urging force urging in a direction away from the valve chamber and the pressure of the refrigerant in the valve chamber, and the valve body is seated / separated with the seating / separating operation. In a flow path switching valve that rotates a valve body and switches a communication destination between a low pressure port formed in the valve seat and two switching ports by a conduction path formed in the valve body,  A flow path switching valve, wherein an opening is formed on a high pressure chamber side of a case body forming the valve chamber, and the high pressure chamber communicates with the outside of the case body only by the opening. 2. The flow path switching valve according to claim 1, wherein the opening is a through hole, and the through hole has a muffler function for a high-pressure refrigerant introduced into the high-pressure chamber. [3] In addition to the urging force, an urging means for urging the valve body in a direction away from the valve seat from the valve seat to a position just before switching is provided. Flow switching valve described.  [4] The urging force and the urging force of the urging means urge the valve body at a center of gravity of a low-pressure opening that opens the conduction path of the valve body toward the valve seat. The flow path switching valve according to claim 3, wherein  5. The flow path switching valve according to claim 3, wherein an interval force between the valve body and the valve seat at a position immediately before the switching is equal to or less than Slmm.  [6] The conduction path has an opening corresponding to the low-pressure port and the switching port through the valve body in a substantially U-shape, and the urging means is disposed between the openings. 4. The flow path switching valve according to claim 3, wherein the flow path switching valve is provided.  7. The flow path switching valve according to claim 1, wherein the conduction path is formed by inserting a spacer into a concave portion formed from the valve seat side of the valve body. [8] A valve seat that accommodates a valve body slidably in the axial direction of the valve chamber and rotatable around the axis in the valve chamber, and the valve body is disposed at one axial end of the valve chamber. The valve body is seated / separated from the valve seat by the urging force urging in a direction away from the valve chamber and the pressure of the refrigerant in the valve chamber, and the valve body is seated / separated with the seating / separating operation. By rotating the valve body, the valve body is formed. The flow path switching valve that switches the communication destination between the low-pressure port formed in the valve seat and the two switching ports by the established conduction path,  A passage is formed in the valve body for communicating the high-pressure chamber with the switching port, and a differential pressure valve that operates by the pressure of the high-pressure refrigerant introduced into the high-pressure chamber is provided in the passage. Flow path switching valve. [9] A valve seat that accommodates a valve body slidably in the axial direction of the valve chamber and rotatable around the axis in the valve chamber, and the valve body is disposed at one axial end of the valve chamber. The valve body is seated / separated from the valve seat by the urging force urging in a direction away from the valve chamber and the pressure of the refrigerant in the valve chamber, and the valve body is seated / separated with the seating / separating operation. The flow path switching valve that rotates the valve body and switches the communication destination between the low pressure port formed in the valve seat and the two switching ports by the conduction path formed in the valve body is provided inside the compressor case. A compressor with a flow path switching valve, characterized in that it has two refrigerant inlet / outlet joints for guiding the refrigerant from the flow path switching valve to the outside of the compressor case.  [10] a head case forming a high-pressure space into which a high-pressure refrigerant is introduced by driving the compressor and a low-pressure space into which a low-pressure refrigerant is introduced,  In the head case, a communication port is formed in a partition wall between the high-pressure space and the low-pressure space, and the two refrigerant inlet / outlet joints that communicate with the high-pressure space side are provided. An opening is formed on the high-pressure chamber side of the case body forming the valve chamber, and the high-pressure chamber communicates with the outside of the case body only by the opening, and the flow path switching valve is connected to the high-pressure space of the head case. And a high-pressure chamber of the flow path switching valve communicates with a high-pressure space of the head case. The low pressure port of the valve seat of the flow path switching valve is connected to the low pressure port of the head case through the communication port. 10. The compressor with a flow path switching valve according to claim 9, wherein the compressor is connected to a space, and the switching port of the valve seat is connected to the refrigerant inlet / outlet joint.  11. The compressor with a flow path switching valve according to claim 9, wherein the high-pressure space, the low-pressure space, and the refrigerant inlet / outlet joint of the head case are formed integrally. 12. The compressor with a flow path switching valve according to claim 9, wherein a valve seat and a Z or a case body of the flow path switching valve are formed integrally with the head case. [13] The claim, wherein a valve shaft and / or a case body of the flow path switching valve is fastened and fixed to the head case by a main shaft penetrating the valve body of the flow path switching valve. 9. The compressor with a flow path switching valve according to 9. 14. The flow path according to claim 9, wherein the head case includes a pressure sensor for detecting a pressure in the low-pressure space, and the flow path switching valve is controlled by a pressure detected by the pressure sensor. Compressor with switching valve. [15] An on-vehicle air conditioner, comprising the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13, or 14. [16] An on-vehicle air conditioner comprising the compressor with the flow path switching valve according to claim 9, 10, 11, 12, 13 or 14, and an electronically controlled expansion valve.