JP2006161713A - Selector valve and compressor equipped with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a selector valve capable of rationally being built in a compressor while reducing the number of parts and simplifying a structure for compacting and reducing cost and the like. <P>SOLUTION: This selector valve is provided in the compressor 60 used for refrigeration cycle or the like as one unit, and including an inlet 23 into which high pressure refrigerant compressed in the compressor 60 is introduced, a first outlet 26 and a second outlet 25 to which refrigerant from the inlet selectively led via a first main valve 40 or a second main valve 30. The first main valve 40 is provided between the inlet 23 and the first outlet 26, the second main valve 30 is provided between the inlet 23 and the second outlet 25, and a solenoid valve O for keeping pressure difference between back pressure acting on the first main valve 40 and pressure in the first outlet 26 side small is provided. When the pressure difference is small, the first main valve 40 is opened and the second main valve 30 is closed, or the first main valve 40 is closed and the second main valve 30 is opened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a switching valve integrally attached to a compressor used in a refrigeration cycle or the like, and a compressor with the switching valve.

  In general, refrigeration cycles such as air conditioners and refrigeration systems include the following patents in addition to compressors, gas-liquid separators, condensers (outdoor heat exchangers), evaporators (indoor heat exchangers), expansion valves, etc. As can be seen in Document 1, etc., a four-way valve is provided as a flow path (flow direction) switching means. However, in such a conventional refrigeration cycle, the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant flow in close proximity in the four-way valve, so the amount of heat conduction from the high-temperature and high-pressure refrigerant to the low-temperature and low-pressure refrigerant increases. There was a problem that heat loss that could not be ignored occurred.

  Therefore, the applicant of the present application has previously proposed a refrigeration cycle using two three-way valves (switching valves) instead of a four-way valve as a flow path switching means in order to reduce heat loss in the refrigeration cycle ( Patent Document 2) below. This will be described below with reference to FIG. 13 (cooling operation state) and FIG. 14 (heating operation state).

  The illustrated refrigeration cycle 201 is of an air conditioner, and the operation mode (cooling operation and heating operation) is switched by a delivery flow path switching three-way valve 230 serving as a delivery flow path switching means. That is, the compressor 210, the gas-liquid separator 212, the condenser (outdoor heat exchanger) 214, the evaporator (indoor heat exchanger) 216, and the expansion valve 218, and the compressor 210, the condenser 214, and The delivery flow path switching three-way valve 230 is arranged between the three evaporators 216. The delivery flow path switching three-way valve 230 is integrally attached to or fixed to the compressor 210. The delivery flow path switching three-way valve 230 may be any of an electromagnetic drive type and an electric type as long as the valve body position (state) is selectively switched. Any of these forms may be used.

  The devices are connected by a flow path formed by a conduit (pipe) or the like. Specifically, the suction channel 221 that guides the refrigerant in the gas-liquid separator 212 to the compressor 210, and the refrigerant discharged from the discharge port 210a of the compressor 210 is the first of the condenser 214 to which the three-way joint 215 is attached. The condenser-side delivery channel 232 that leads to the circulation port 214a, and the evaporator-side delivery channel that guides the refrigerant discharged from the discharge port 210a of the compressor 210 to the first circulation port 216a of the evaporator 216 provided with the three-way joint 217. 234, a flow path 226 connecting the second flow port 214b of the condenser 214 and the expansion valve 218, a flow path 227 connecting the expansion valve 218 and the second flow port 216b of the evaporator 216, and a first of the condenser 214. A condenser-side return channel 236 for connecting the circulation port 214b and the return port 212a of the gas-liquid separator 212, a first circulation port 216a of the evaporator 216, and a return port 212a of the gas-liquid separator 212 An evaporator-side return channel 238 for connection is provided, and a return channel switching means is provided between the return port 212a of the gas-liquid separator 212 and the condenser-side return channel 236 and the evaporator-side return channel 238. The return flow path switching three-way valve 240 is disposed. The return flow path switching three-way valve 240 is integrally attached to or held and fixed to the gas-liquid separator 212. The return flow path switching three-way valve 240 is preferably a differential pressure drive type that automatically switches the position (state) of the valve body.

  Here, when the cooling operation mode is selected, the delivery flow path switching three-way valve 230 causes the discharge port 210a of the compressor 210 and the condenser side delivery flow path 232 to communicate with each other as shown in FIG. At the same time, when the discharge port 210a and the evaporator-side delivery channel 234 are shut off and the heating operation mode is selected, as shown in FIG. 14, the discharge port 210a of the compressor 210 and the condenser-side delivery channel 234 In addition, the discharge port 210a and the evaporator-side delivery channel 234 are communicated with each other.

  When the cooling operation mode is selected, the return flow path switching three-way valve 240 shuts off the return port 212a of the gas-liquid separator 212 and the condenser side return flow path 236 as shown in FIG. At the same time, when the return port 212a and the evaporator-side return flow path 238 are communicated and the heating operation mode is selected, as shown in FIG. 14, the return port 212a of the gas-liquid separator 212 and the condenser The side return flow path 236 is communicated, and the return port 212a and the evaporator side return flow path 238 are blocked.

  In the refrigeration cycle 201 having such a configuration, when the cooling operation mode is selected, the refrigerant in the gas-liquid separator 212 is sucked into the compressor 210 via the suction passage 221 as shown in FIG. At the same time, the high-temperature and high-pressure refrigerant is led from the discharge port 210a of the compressor 210 to the condenser 214 via the three-way valve 230 for switching the delivery channel and the condenser-side delivery channel 232. It exchanges and condenses, becomes a high-pressure two-phase refrigerant, and is introduced into the expansion valve 218 via the flow path 226. The expansion valve 218 depressurizes the high-pressure refrigerant, and the depressurized low-pressure refrigerant is introduced into the evaporator 216 via the flow path 227, where it evaporates through heat exchange (cooling) with room air. From 216, the low-temperature and low-pressure refrigerant is returned to the gas-liquid separator 212 via the evaporator-side return channel 328 and the return channel switching three-way valve 240. At this time, since the end of the evaporator-side delivery channel 234 on the compressor 210 side is closed by the delivery channel switching three-way valve 230, the low-pressure refrigerant in the evaporator-side delivery channel 234 is substantially reduced. Since the end of the condenser side return flow path 236 on the gas-liquid separator 212 side is closed by the return flow path switching three-way valve 240, the inside of the condenser side return flow path 236 is fixed. The high pressure refrigerant is substantially stationary.

  On the other hand, when the heating operation mode is selected, as shown in FIG. 14, the refrigerant in the gas-liquid separator 212 is sucked into the compressor 210 via the suction flow path 221 and the discharge port of the compressor 210 is discharged. From 210a, the high-temperature and high-pressure refrigerant is led to the evaporator 216 through the three-way valve 230 for switching the delivery flow path and the evaporator-side delivery flow path 234, and in the evaporator 216, heat is exchanged with room air (heating) and evaporated. A high-pressure two-phase refrigerant is introduced into the expansion valve 218 via the flow path 227. The expansion valve 218 decompresses the high-pressure refrigerant, and the decompressed low-pressure refrigerant is introduced into the condenser 214 via the flow path 226, where it is condensed by exchanging heat with outdoor air. The low-temperature and low-pressure refrigerant is returned to the gas-liquid separator 212 via the condenser-side return channel 236 and the return channel switching three-way valve 240. At this time, the compressor 210 side end of the condenser side delivery channel 232 is closed by the delivery channel switching three-way valve 230, so that the low-pressure refrigerant in the condenser side delivery channel 232 is substantially reduced. Further, the end of the evaporator-side return channel 238 on the gas-liquid separator 212 side is closed by the return-channel switching three-way valve 240, so that the inside of the evaporator-side return channel 238 is closed. The high pressure refrigerant is substantially stationary.

  In the refrigeration cycle 201 having such a configuration, three-way valves 230 and 240 are used instead of the four-way valve, and the three-way valve for switching the delivery flow path is selected when any of the cooling and heating operation modes is selected. 230 and the return flow switching three-way valve 240, the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant are close to each other, but one of them is flowing but the other is substantially stationary. The amount of heat conduction from the high-temperature and high-pressure refrigerant to the low-temperature and low-pressure refrigerant is smaller than when a conventional ordinary four-way valve is used. For this reason, it is possible to reduce the heat loss equal to or more than that when the heat insulating means is incorporated in the four-way valve.

  In addition, since the three-way valve 230 for switching the delivery flow path and the three-way valve 240 for returning flow path are integrally attached or held and fixed to the compressor 210 and the gas-liquid separator 212, respectively, no housing or brackets are required. The advantage that it can be made is also obtained.

JP 2003-139430 A Description and drawing of Japanese Patent Application No. 2004-253294

  By the way, when the three-way valve for switching the flow path (switching valve) 230 is attached integrally to the compressor 210 of the refrigeration cycle 201 as described above, the number of parts of the switching valve is reduced and the structure is simplified. It is desired that the switching valve and the compressor provided with the switching valve and the compressor provided with the switching valve and the compressor can be rationally incorporated into the compressor, and the cost can be reduced.

  The present invention has been made to meet such demands, and its purpose is to simplify the structure by reducing the number of parts and to make the compressor rational in order to achieve compactness and cost reduction. And a compressor with a switching valve.

  In order to achieve the above object, a switching valve according to the present invention is basically provided integrally with a compressor used in a refrigeration cycle or the like, and is an inlet into which a high-pressure refrigerant compressed in the compressor is introduced. And a second outlet and a first outlet through which the refrigerant from the inlet is selectively guided through the first main valve or the second main valve.

  The first main valve is provided between the inlet and the first outlet, and the second main valve is provided between the inlet and the second outlet, and acts on the first main valve. An electromagnetic valve for reducing the differential pressure between the back pressure and the pressure on the first outlet side, and when the differential pressure is reduced, the first main valve is opened and the second main valve is opened. The valve is closed, or the first main valve is closed and the second main valve is opened.

  In a preferred aspect, the first main valve is provided with a first slide valve body having a valve body portion, and a valve seat in which the valve body portion is brought into contact with and separated from the inlet and the first outlet so as to cut off and communicate with each other. A first back pressure chamber provided on the opposite side of the first slide valve body from the first valve chamber, and the slide valve in a direction in which the valve body portion is closed or opened. An urging member for urging the body, wherein the second main valve blocks a second slide valve body having a main valve body portion and a sub-valve body portion, and the inlet and the second outlet. A second valve chamber provided with a main valve seat for contacting and separating the main valve body portion to communicate, a second back pressure chamber provided with a sub valve seat for contacting and separating the sub valve body portion; A biasing member that biases the second slide valve body in a direction in which the valve body portion is closed and the sub-valve body portion is opened, and the first back pressure chamber in the first main valve and the front A pilot passage communicating with the downstream portion from the valve seat is provided, the pilot passage is opened and closed by the electromagnetic valve, and the pressure in the downstream portion from the valve seat is controlled by the sub-valve of the second slide valve body It is made to act on a body part. In this case, preferably, the first main valve and the first main valve are arranged in parallel.

  In another preferred aspect, the first main valve includes a first slide valve body having a valve body portion, and a valve seat in which the valve body portion contacts and separates so as to cut off and communicate between the inlet and the first outlet. A first valve chamber provided on the opposite side of the first slide valve body from the first valve chamber, and the slide valve in a direction in which the valve body portion is closed. An urging member for urging the body, wherein the second main valve blocks a second slide valve body having a main valve body portion and a sub-valve body portion, and the inlet and the second outlet. A second valve chamber provided with a main valve seat for contacting and separating the main valve body portion to communicate, a second back pressure chamber provided with a sub valve seat for contacting and separating the sub valve body portion; An urging member that urges the second slide valve body in a direction in which the valve body portion is closed and the sub-valve body portion is opened, and the first slide valve body includes the first back pressure chamber. Above A pilot passage communicating with a portion downstream from the seat is provided, the pilot passage is opened and closed by the electromagnetic valve, and the pressure in the portion downstream from the valve seat is controlled by the sub-valve body of the second slide valve body It is made to act on a part. In this case, preferably, the first main valve and the second main valve are disposed on the same axis, and more preferably, the electromagnetic valve is also disposed on the same axis.

  On the other hand, the compressor with a switching valve according to the present invention basically includes a casing having an upper surface opened, a compression mechanism disposed in the casing, and a drive for driving the compression mechanism. The rotating shaft, a rotor externally fitted to the rotational shaft, and an electric motor unit including a stator internally fitted and fixed to the casing, and the configuration attached to seal and close the upper surface opening of the casing A low-pressure refrigerant sucked from the suction port is compressed by the compression mechanism unit, the compressed high-pressure refrigerant is guided to the inlet of the switching valve, and the second outlet of the switching valve and It discharges from either of the first outlets.

  In a preferred aspect, the compression mechanism portion having a discharge chamber whose upper surface is opened is disposed on an electric motor case containing the electric motor portion, and the switching valve is disposed so as to cover the discharge chamber. The compression mechanism section and the electric motor case are fastened together by bolts.

  In another preferred aspect, the switching valve has a lid-like main body portion that is hermetically bonded to the housing portion, and the inlet is provided on a lower surface side overhanging portion of the lid-like main body portion that is located in the housing portion. The first main valve and the second main valve are provided, and the second outlet and the first outlet are opened on the upper surface side of the lid-like main body, and the electromagnetic valve is disposed.

  In another preferred aspect, the switching valve has a lid-like main body portion having a generally convex cross section that is hermetically joined to the housing portion, and the first main valve, Two main valves and a solenoid valve are provided.

  According to the present invention, the number of parts of the switching valve can be reduced and the structure can be simplified, and the switching valve can be rationally incorporated in the compressor like a lid member, so that the switching valve and the compressor with the switching valve can be compact. And cost reduction can be achieved.

  Embodiments of the present invention will be described below with reference to the drawings.

  1, 2, and 3 are a plan view, a partially cutaway side view, and a cross-sectional view taken along line AA in FIG. 2, respectively, of an embodiment of a compressor with a switching valve according to the present invention.

  The illustrated compressor 10 with a switching valve corresponds to the compressor 210 of the refrigeration cycle 201 shown in FIGS. 13 and 14 described above, and includes a bottomed cylindrical casing 12 having an opening 12a on the top surface. A compression mechanism portion 13 disposed in the housing portion 12, a rotary shaft 15 for driving the compression mechanism portion 13, a rotor 16 externally fitted and fixed to the rotation shaft 15, and the rotor 16 The refrigeration cycle 201 shown in FIG. 13 and FIG. 14 described above, which is mounted like a lid member that hermetically closes the motor portion 14 including the stator 17 that is internally fitted and fixed, and the opening 12a of the housing portion 12. And a switching valve 20 corresponding to the delivery flow path switching three-way valve 230, and compresses the low-pressure refrigerant sucked from the suction port (pipe) 18 provided in the lower part of the housing 12 by the compression mechanism 13. Compressed high-pressure refrigerant In addition to being guided to the inlet 23 (see FIGS. 5 and 6) of the switching valve 20, it is discharged from either the second outlet 25 (pipe 27) or the first outlet 26 (pipe 28) of the switching valve 20. ing.

  The switching valve 20 includes a disc-shaped lid-like main body portion 22 having a lower surface side projecting portion 22a having a substantially rectangular cross section made of a single metal block. The upper end portion of the casing portion 12 is sealed and joined to the formed step portion 22b) by butt welding (welded portion K). As shown in FIGS. 5 and 6, the inlet 23 is formed in the lower surface side protruding portion 22 a of the lid-like main body portion 22 located in the housing portion 12. Stepped first valve hole 41 for the first main valve 40 (pilot-type solenoid valve) and stepped second valve hole for the second main valve 30 (differential pressure responsive valve) are arranged so as to be orthogonal to each other. 31 is provided in parallel, and the first outlet 26 (pipe 28) and the second outlet 25 (pipe 27) are provided vertically on the upper surface side of the lid-like main body portion 22, and the motor power connector 19 and the connector will be described later. A valve hole 21 for the electromagnetic valve 50 is provided.

  The switching valve 20 includes a first main valve 40 provided between the inlet 23 and the first outlet 26, and a second main valve 30 provided between the inlet 23 and the second outlet 25. An electromagnetic valve 50 is provided for reducing the differential pressure between the back pressure acting on the valve 40 and the pressure on the first outlet 26 side. When the differential pressure is reduced, the first main valve 40 is opened. The second main valve 30 is closed.

  More specifically, the first main valve 40 includes a first slide valve body 42 having a valve body portion 42A and a large diameter portion 42C, and a valve body so as to cut off and communicate between the inlet 23 and the first outlet 26. A first valve chamber 44 provided with a valve seat 45 to which the portion 42A contacts and separates; a first back pressure chamber 47 provided on the opposite side of the first slide valve body 42 from the first valve chamber 44; A coil spring 48 as a biasing member that biases the slide valve body 42 in a direction in which the body portion 42A is closed.

  The second main valve 30 is configured to block and communicate between the second slide valve body 32 having the main valve body portion 32A, the sub valve body portion 32B, and the large diameter portion 32C, and the inlet 23 and the second outlet 25. A second valve chamber 34 provided with a main valve seat 35 to which the main valve body portion 32A contacts and separates; a second back pressure chamber 37 provided with a sub valve seat 36 to which the sub valve body portion 32B contacts and separates; And a coil spring 38 as a biasing member that biases the second slide valve body 32 in a direction in which the valve body portion 32A is closed and the sub-valve body portion 32B is opened.

  The high-pressure refrigerant introduced into the inlet 23 includes the second valve chamber 34, the communication passage 39, the first valve chamber 44, the first slide valve body 42 (the large diameter portion 42C thereof) and its sliding wall surface ( In addition to being introduced into the first back pressure chamber 47 through the first valve hole 41), the second slide valve body 32 (large diameter portion 32C) and its sliding wall surface (second valve hole 31) The second back pressure chamber 37 is also introduced.

  Further, as shown in an enlarged view in FIG. 4, a pilot passage 55 is provided that communicates the first back pressure chamber 47 of the first main valve 40 and the downstream portion 41 a from the valve seat 45 via an electromagnetic valve 50. At the same time, the pilot passage 55 (the valve chamber side port 55a) is opened and closed by an electromagnetic valve 50 including a coil portion 51, a suction element 52, a valve body (plunger) 53 with a ball 53a, an urging spring 54, and the like. Further, the downstream portion 41a and the second back pressure chamber 37 are communicated with each other via the communication passage 49 and the communication passage 33a of the stepped cylindrical valve seat forming member 33 from the valve seat 45. The solenoid valve 50 is a well-known general-purpose product, and when not energized, the valve body 53 is pushed down by the biasing spring 54 and the pilot passage 55 (the valve chamber side port 55a). ) Is closed and energized, the valve body 53 is pulled up toward the suction element 52 side to open the pilot passage 55 (the valve chamber side port 55a).

  Further, the coil springs are respectively provided on the first back pressure chamber 47 side and the second back pressure chamber 37 side of the first main valve 40 and the second main valve 30 in the lower surface side overhanging portion 22a of the lid-shaped main body portion 22a. Screw caps 24A and 24B, which also serve as spring receivers 48 and 38, are screwed together.

  In the switching valve 20 configured as described above, when the compressor 10 is not operated (when the refrigerant is not compressed), the second main valve 30 is driven by the biasing force of the coil spring 38. The valve body 32A is closed, the sub-valve body 32B is opened, the first main valve 40 is closed by the biasing force of the coil spring 48, and the solenoid valve 50 is not energized ( The pilot passage 55 is closed.

  When the compressor 10 is operated and the solenoid valve 50 is not energized (when no power is supplied), a high-pressure refrigerant is introduced into the inlet 23 as shown in FIG. The pilot passage 55 (the valve chamber side port 55a) is closed. At this time, the pressure of the high-pressure refrigerant introduced into the inlet 23 acts on the large-diameter portion 32C of the second slide valve body 32 of the second main valve 30, thereby causing the second slide valve body 32 to move to the coil spring 38. It moves to the right against the urging force, the main valve body portion 32A is opened, the sub valve body portion 32B is closed, and the first pressure from the internal pressure of the downstream portion 41a from the valve seat 45 of the first main valve 40 is first. Since the internal pressure (back pressure) of the back pressure chamber 47 becomes higher (the differential pressure becomes larger), the valve body portion 42A of the first slide valve body 42 is closed. For this reason, the high-pressure refrigerant is guided to the second outlet 25 and discharged.

  On the other hand, when the solenoid valve 50 is energized (when energized), as shown in FIG. 6, a high-pressure refrigerant is introduced into the inlet 23, and the valve body 53 of the solenoid valve 50 is pulled up and piloted. The passage 55 (the valve chamber side port 55a) is opened. As a result, the pressure in the downstream portion 41a rises from the valve seat 45 of the first main valve 40 and the differential pressure with respect to the first back pressure chamber 47 becomes smaller, and the pressure in the downstream portion 41a from the raised valve seat 45 becomes smaller. Since it acts on the sub-valve part 32B of the second slide valve body 32 via the communication passages 49 and 33a, the second slide valve body 32 of the second main valve 30 moves left and the main valve body part 32A closes. As a result, the sub-valve part 32B is opened, whereby the high-pressure refrigerant is guided from the inlet 23 to the first valve chamber 44 of the first main valve 40 via the communication passage 39, and the first slide valve body. The first slide valve body 42 moves to the left against the urging force of the coil spring 48, and the valve body part 42A is opened. For this reason, the high-pressure refrigerant is guided to the first outlet 26 and discharged.

  As described above, in the switching valve 20 of the present embodiment, switching of the outlet for discharging the high-pressure refrigerant (switching between the second outlet 25 and the first outlet 26) is performed by energizing / de-energizing the solenoid valve 50. Since it is performed, it can serve as the delivery flow path switching three-way valve 230 of the refrigeration cycle 201 shown in FIGS.

  In addition, the switching valve 20 of the present embodiment has a lid-like main body portion 22 that is hermetically joined to the housing portion 12 of the compressor 10, and the lower surface side tension of the lid-like main body portion 22 located in the housing portion 12. The outlet portion 22a is provided with an inlet 23, a first main valve 40, and a second main valve 30, and a second outlet 25 and a first outlet 26 are opened on the upper surface side of the lid-like main body portion 22, and electromagnetic Since the valve 50 is provided, the structure can be simplified by reducing the number of parts, and the compressor 10 can be rationally incorporated like a lid member, so that the switching valve 20 and the compressor 10 with the switching valve can be compact. And cost reduction can be achieved.

  7, 8, and 9 are a plan view, a longitudinal cross-sectional view, and FIG. 8, respectively, showing an example in which the switching valve 20 having substantially the same configuration as described above is incorporated in a compressor 60 that is different from the compressor 10. It is CC sectional view taken on the line. 7-9, the same code | symbol is attached | subjected to the same structure thru | or the same functional part as each part of the compressor 10 with a switching valve shown by FIGS. 1-6, and duplication description is abbreviate | omitted.

  A compressor 60 with a switching valve shown in FIGS. 7 and 8 has a short cylindrical shape with a fixed scroll portion 66 provided on an electric motor case 14a containing the electric motor portion 14 and a discharge chamber 65 having an open upper surface. A short cylindrical lower half 61 in which a swing scroll member 63 is disposed in a space defined between the upper half 62 and the rotary shaft 15 and defined between the upper half 62 and the upper half 62. And the switching valve 20 is disposed so as to cover the discharge chamber 65, the switching valve 20 (the outer peripheral portion of the lid-like main body portion 22), and the compression mechanism portion 13 (the upper half). The body 62 and the outer half of the lower half 61) and the electric motor case 14a are fastened together by a plurality of (here, four) hexagon socket bolts 58.

  Further, projecting portions 56 and 56 are provided for attachment of the compressor 60 with the switching valve to the lower left corner portion and the upper right corner portion of the lower surface side protruding portion 22a of the lid-like main body portion 22 in the switching valve 20. Bolts or screw holes or female screw portions 69, 69 are provided.

  Also in the compressor 60 with the switching valve having such a configuration, the lid-like main body portion 22 of the switching valve 20 can be rationally like a lid member by tightening the upper half body portion 62, which is a casing portion of the compressor, with a bolt 58. Therefore, the switching valve 20 and the compressor 10 with the switching valve can be made compact, the cost can be reduced, and the like.

  FIG. 10 is a longitudinal sectional view showing an example in which a switching valve 70 having a configuration different from that of the switching valve 20 described above is incorporated in a compressor having the same configuration as the compressor 60 shown in FIGS. 7 and 8. 10, the same reference numerals are given to the same components or the same functional parts as those of the compressor 60 with a switching valve shown in FIG. 7 and FIG.

  The switching valve 70 incorporated in the compressor 60 ′ with a switching valve shown in FIG. 10 has a lid-shaped main body 72 having a generally convex cross section made of one metal block. The protrusion 72b is formed with an inlet 23 and orthogonal to the inlet 23, as can be understood from FIG. 11 (when the solenoid valve 50 is not energized) and FIG. 12 (when the solenoid valve 50 is energized). In addition, a common valve hole 71 is provided so that the solenoid valve 50, the first main valve 40, and the second main valve 30 are located on the same axis, and the left side surface of the convex portion 72b (the common valve hole 71 The second outlet 25 is provided at the right end), the first outlet 26 is provided on the upper surface side thereof, and the electromagnetic valve support member 59 is attached to the left end of the common valve hole 71.

  Also in the switching valve 70, the second main valve 30 is provided between the inlet 23 and the second outlet 25, and the first main valve 40 is provided between the inlet 23 and the first outlet 26. An electromagnetic valve 50 is provided to reduce the differential pressure between the back pressure acting on the main valve 40 and the pressure on the first outlet 26 side, and when the differential pressure is reduced, the second main valve 30 is closed. The first main valve 40 is opened.

  More specifically, the first main valve 40 includes a first slide valve body 42 having a valve body portion 42A and a large diameter portion 42C, and a valve body so as to cut off and communicate between the inlet 23 and the first outlet 26. A first valve chamber 44 provided with a valve seat 45 to which the portion 42A contacts and separates; a first back pressure chamber 47 provided on the opposite side of the first slide valve body 42 from the first valve chamber 44; A coil spring 48 as a biasing member that biases the slide valve body 42 in a direction in which the body portion 42A is closed.

  The second main valve 30 is configured to block and communicate between the second slide valve body 32 having the main valve body portion 32A, the sub valve body portion 32B, and the large diameter portion 32C, and the inlet 23 and the second outlet 25. A second valve chamber 34 provided with a main valve seat 35 to which the main valve body portion 32A contacts and separates; a second back pressure chamber 37 provided with a sub valve seat 36 to which the sub valve body portion 32B contacts and separates; And a coil spring 38 as a biasing member that biases the second slide valve body 32 in a direction in which the valve body portion 32A is closed and the sub-valve body portion 32B is opened.

  The high-pressure refrigerant introduced into the inlet 23 includes the communication passage 39, the first valve chamber 44, the first slide valve body 42 (the large diameter portion 42C) and its sliding wall surface (common valve hole 71). Between the second slide valve body 32 (the large diameter portion 32C) and its sliding wall surface and also into the second back pressure chamber 37. be introduced.

  The first slide valve body 42 of the first main valve 40 has a pilot passage communicating the first back pressure chamber 47 and a downstream portion (on the side of the first outlet 26 and the second main valve 30) from the valve seat 45. (Communication passage) 55 ′ is provided, the pilot passage 55 ′ is opened and closed by the electromagnetic valve 50, and the pressure in the downstream portion from the valve seat 45 is connected to the holding member 72 with communication holes, with communication holes. The spacer 73 and the stepped cylindrical valve seat forming member 33 are configured to act on the sub-valve body portion 32B of the second slide valve body 32 via the communication passage 33a. The solenoid valve 50 is a well-known general-purpose product, and when not energized, the valve body 53 is pushed down by the biasing spring 54 to close the pilot passage 55 'and energize. Then, the valve body 53 is pulled up toward the suction element 52 so as to open the pilot passage 55 ′.

  Further, a female thread portion 76 for attaching the switching valve-equipped compressor 60 ′ is formed on the convex portion 72 b of the lid-like main body portion 72.

  Even in the switching valve 70 configured as described above, when the compressor 60 ′ is not operated (when the refrigerant is not compressed), the second main valve 30 is driven by the biasing force of the coil spring 38. The main valve body portion 32A is closed, the sub valve body portion 32B is opened, the valve body portion 42 of the first main valve 40 is closed by the urging force of the coil spring 48, and the solenoid valve 50 is not energized. (Non-energized), the pilot passage 55 'is closed.

  When the compressor 10 is operated and the solenoid valve 50 is not energized (when no power is supplied), a high-pressure refrigerant is introduced into the inlet 23 as shown in FIG. The pilot passage 55 'is closed. At this time, the pressure of the high-pressure refrigerant introduced into the inlet 23 acts on the large-diameter portion 32C of the second slide valve body 32 of the second main valve 30, thereby causing the second slide valve body 32 to move to the coil spring 38. The main valve body 32A is opened, the sub-valve body 32B is closed, and the first back of the first main valve 40 from the internal pressure of the downstream portion of the valve seat 45 is opened. Since the internal pressure (back pressure) of the pressure chamber 47 becomes higher (the differential pressure becomes larger), the valve body portion 42A of the first slide valve body 42 is closed. For this reason, the high-pressure refrigerant is guided to the second outlet 25 and discharged.

  On the other hand, when the solenoid valve 50 is energized (when energized), as shown in FIG. 12, a high-pressure refrigerant is introduced into the inlet 23, and the valve body 53 of the solenoid valve 50 is pulled up to pilot. The passage 55 'is opened. As a result, the pressure in the downstream portion from the valve seat 45 of the first main valve 40 increases, the differential pressure with respect to the first back pressure chamber 47 decreases, and the increased pressure in the downstream portion 41 a communicates with the valve seat 45. The second main valve acts on the sub-valve part 32B of the second slide valve body 32 via the communication member 33a of the holding member 72 with hole, the spacer 73 with the communication hole, and the stepped cylindrical valve seat forming member 33. The 30 second slide valve body 32 goes to the right, the main valve body portion 32A is closed, and the sub-valve body portion 32B is opened. As a result, the high-pressure refrigerant flows from the inlet 23 through the communication passage 39. Are guided to the first valve chamber 44 of the first main valve 40 and act on the large-diameter portion 42C of the first slide valve body 42, whereby the first slide valve body 42 resists the biasing force of the coil spring 48. The valve body 42A is opened. For this reason, the high-pressure refrigerant is guided to the first outlet 26 and discharged.

  Thus, also in the switching valve 70 of this example, the solenoid valve 50 is energized / de-energized to switch the outlet for discharging the high-pressure refrigerant (switching between the second outlet 25 and the first outlet 26). Therefore, it can serve as the three-way valve 230 for switching the delivery flow path of the refrigeration cycle 201 shown in FIGS.

  Further, the lid-like main body portion 72 of the switching valve 70 is rationally incorporated like a lid member together with the upper half body portion 62, which is the casing portion of the compressor, by a bolt 58, and the electromagnetic valve 50, the second By providing the first main valve 40 and the second main valve 30 on the same axis, the switching valve 20 and the compressor 10 with a switching valve can be further reduced in size and cost.

  In the above embodiment, the coil spring 48, which is the urging member of the first main valve 40, is disposed in the first back pressure chamber 47, and the valve body portion 42A of the first slide valve body 42 is closed. However, instead of this, a coil spring 48, which is an urging member of the first main valve 40, is disposed in the first valve chamber 44 so that the first slide valve body 42 is moved. The valve body portion 42A may be biased in the opening direction.

  By doing so, when the solenoid valve 50 is not energized (when not energized), the biasing force of the coil spring 48 is applied to the first slide valve body 42 in addition to the pressure of the high-pressure refrigerant from the inlet 23. Therefore, the valve body portion 42A of the first main valve 40 is opened, and accordingly, the sub-valve body portion 32B of the second main valve 30 is opened and the main valve body portion 32A is closed. The high-pressure refrigerant is guided from the inlet 23 to the first outlet 26 via the first valve chamber 44 and discharged.

  On the other hand, when the solenoid valve 50 is energized (when energized), the pilot passage 55 (the valve chamber side port 55a) is opened, so that the downstream portion 41a and the first portion of the first main valve 40 from the valve seat 45 are opened. The differential pressure with respect to the back pressure chamber 47 is reduced, and the main valve body portion 32A of the second slide valve body 32 is opened and the sub-valve body portion 32B is closed by the pressure of the high-pressure refrigerant introduced into the inlet 23. Thus, the high-pressure refrigerant is guided to the second outlet 25 and discharged.

The top view of one Embodiment of the compressor with a switching valve which concerns on this invention. The partial notch side view of one Embodiment of the compressor with a switching valve which concerns on this invention. AA arrow sectional drawing of FIG. The figure which expands and shows the switching valve part of FIG. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4 for explaining the configuration of the switching valve and the operation when the solenoid valve is not energized. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4, which is used to explain the configuration of the switching valve and the operation of the switching valve when the solenoid valve is energized. The top view which shows the example which incorporated the switching valve of the structure substantially the same as what is shown by FIGS. 1-6 in the compressor of the type different from what is shown by FIGS. The longitudinal cross-sectional view which shows the example which incorporated the switching valve of the structure substantially the same as what is shown by FIGS. 1-6 in the compressor of the type different from what is shown by FIGS. 1-3. CC sectional view taken on the line of FIG. The longitudinal cross-sectional view which shows the example which incorporated the switching valve of the structure different from what was mentioned above into the compressor of the same structure as what is shown by FIG. 7, FIG. The figure which expands and shows the switching valve part of FIG. 10 (at the time of solenoid valve energization). The figure which expands and shows the switching valve part of FIG. 10 (at the time of solenoid valve energization). The figure which shows the air_conditioning | cooling operation state of an example of the refrigerating cycle to which the compressor with a switching valve which concerns on this invention is applied. The figure which shows the heating operation state of an example of the refrigerating cycle to which the compressor with a switching valve which concerns on this invention is applied.

Explanation of symbols

10, 60, 60 '... compressor with switching valve 12 ... casing 13 ... compression mechanism 14 ... motor unit 15 ... rotating shaft 20, 70 ... switching valve 23 ... inlet 25 ... second outlet 26 ... first outlet 30 ... 2nd main valve 32 ... 2nd slide valve body 32A ... Main valve body part 32B ... Sub valve body part 37 ... 2nd back pressure chamber 40 ... 1st main valve 42 ... 1st slide valve body 42A ... Valve body part 47 ... 1st back pressure chamber 49 ... Communication passage 50 ... Solenoid valve 55, 55 '... Pilot passage

Claims (10)

  An inlet which is integrally attached to a compressor used in a refrigeration cycle or the like and into which a high-pressure refrigerant compressed in the compressor is introduced, and the refrigerant from the inlet passes through the first main valve or the second main valve. A switching valve having a first outlet and a second outlet that are selectively guided, wherein the first main valve is provided between the inlet and the first outlet, and the inlet and the second outlet The second main valve is provided, and an electromagnetic valve for reducing the differential pressure between the back pressure acting on the first main valve and the pressure on the first outlet side is provided, and the differential pressure When the first main valve is opened and the second main valve is closed, or the first main valve is closed and the second main valve is opened. A switching valve characterized in that The first main valve is provided with a first slide valve body having a valve body portion, and a valve seat on which the valve body portion contacts and separates so as to cut off and communicate between the inlet and the first outlet. The valve chamber, a first back pressure chamber provided on the opposite side of the first slide valve body from the first valve chamber, and the slide valve body are biased in a direction in which the valve body portion is closed or opened An urging member to be
The second main valve has a main valve body portion that is in contact with and separated from the second slide valve body having a main valve body portion and a sub-valve body portion, and the inlet and the second outlet to cut off and communicate with each other. A second valve chamber provided with a valve seat, a second back pressure chamber provided with a sub-valve seat that contacts and separates the sub-valve body portion, the main valve body portion is closed, and the sub-valve body portion is opened. An urging member that urges the second slide valve body in the direction of
A pilot passage that communicates the first back pressure chamber of the first main valve with a portion downstream from the valve seat is provided, the pilot passage is opened and closed by the electromagnetic valve, and from the valve seat The switching valve according to claim 1, wherein the pressure in the downstream portion is applied to the sub-valve part of the second slide valve body.   The switching valve according to claim 2, wherein the first main valve and the second main valve are arranged in parallel. The first main valve is provided with a first slide valve body having a valve body portion, and a valve seat on which the valve body portion contacts and separates so as to cut off and communicate between the inlet and the first outlet. A valve chamber, a first back pressure chamber provided on the opposite side of the first slide valve body from the first valve chamber, and an urging force for urging the slide valve body in a direction in which the valve body portion is closed. A force member,
The second main valve has a main valve body portion that is in contact with and separated from the second slide valve body having a main valve body portion and a sub-valve body portion, and the inlet and the second outlet to cut off and communicate with each other. A second valve chamber provided with a valve seat, a second back pressure chamber provided with a sub-valve seat that contacts and separates the sub-valve body portion, the main valve body portion is closed, and the sub-valve body portion is opened. An urging member that urges the second slide valve body in the direction of
The first slide valve body is provided with a pilot passage that communicates the first back pressure chamber and a portion downstream from the valve seat, and the pilot passage is opened and closed by the electromagnetic valve, and the valve 2. The switching valve according to claim 1, wherein the pressure in the downstream portion from the seat is applied to the sub-valve part of the second slide valve body.   The switching valve according to claim 4, wherein the first main valve and the second main valve are disposed on the same axis.   The switching valve according to claim 4, wherein the first main valve, the second main valve, and the electromagnetic valve are disposed on the same axis.   A casing having an opening on the upper surface; a compression mechanism disposed in the casing; a rotary shaft for driving the compression mechanism; a rotor externally fixed to the rotary shaft; An electric motor portion comprising a stator fitted and fixed to the case, and a switching valve according to any one of claims 1 to 6 attached like a lid member that seals and closes the opening of the housing portion. The low-pressure refrigerant sucked from the suction port is compressed by the compression mechanism unit, and the compressed high-pressure refrigerant is guided to the inlet of the switching valve and from either the second outlet or the first outlet of the switching valve. A compressor with a switching valve, characterized by being discharged.   The compression mechanism portion having a discharge chamber having an upper surface opened is disposed on an electric motor case containing the electric motor portion, and the switching valve is disposed so as to cover the discharge chamber. The switching valve and the compression mechanism The compressor with a switching valve according to claim 7, wherein the portion and the electric motor case are fixed together by bolts.   The switching valve has a lid-like main body portion hermetically bonded to the housing portion, and the inlet and the first main valve are provided on a lower surface side protruding portion of the lid-like main body portion located in the housing portion. And a second main valve, the first outlet and the second outlet are opened on the upper surface side of the lid-like main body, and the electromagnetic valve is disposed. A compressor with a switching valve according to claim 7.   The switching valve has a lid-like main body portion having a generally convex cross section that is hermetically joined to the housing portion, and the first main valve, the second main valve, and the electromagnetic wave are provided on the convex portion of the lid-like main body portion. The compressor with a switching valve according to claim 7, wherein a valve is provided.

Images