CN108253669B

CN108253669B - Multi-way reversing device and air conditioning system

Info

Publication number: CN108253669B
Application number: CN201611243952.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2021-10-19
Anticipated expiration: 2036-12-29
Also published as: CN108253669A

Abstract

The invention discloses a multi-way reversing device and an air conditioning system, wherein the multi-way reversing device comprises a main valve, the main valve comprises a main valve body, a main valve seat, a valve core, a first valve port and a second valve port, the main valve seat is arranged in the main valve body and comprises a first valve hole, a second valve hole and a third valve hole, the main valve body comprises an inlet which is arranged opposite to the main valve seat, when the multi-way reversing device is positioned at a first working position, the first valve hole is communicated with the inlet, the valve core closes the second valve port, the valve core enables the first valve port not to be communicated with the inlet, and the valve core enables the first valve port not to be communicated with the second valve port; the air conditioning system comprises a multi-way reversing device, the multi-way reversing device is used for controlling the flow direction of a refrigerant in the air conditioning system, the temperature adjusting function of the air conditioning system is realized by utilizing the multi-way reversing device, and the layout difficulty and the cost of devices in the air conditioning system are favorably reduced.

Description

Multi-way reversing device and air conditioning system

[ technical field ] A method for producing a semiconductor device

The present invention relates to the field of control technologies, and in particular, to a control device for controlling a flow direction of a fluid and an air conditioning system having the control device.

[ background of the invention ]

A stop valve is adopted in the air conditioning system to control the on-off of a refrigerant pipeline and the flow direction of the refrigerant. Under the general condition, air conditioning system needs a plurality of stop valve control refrigerant flow directions, and then realizes air conditioning system's temperature regulation, sets up a plurality of stop valves in the system and not only can increase the port quantity and the pencil of controller control stop valve, and the stop valve occupies air conditioning system inner space, increases the overall arrangement degree of difficulty of device in the system. Therefore, there is a need for improvement of the prior art to solve the above technical problems

[ summary of the invention ]

The invention aims to provide a multi-way reversing device and an air conditioning system, which relatively simplify the layout of devices in the air conditioning system.

In order to achieve the purpose, the invention adopts the following technical scheme: a multi-way reversing device comprises a main valve, wherein the main valve comprises a main valve body, a main valve seat, a sliding block and a valve core, the main valve seat is fixed with the main valve body, the main valve seat comprises a first valve hole, a second valve hole and a third valve hole, the main valve comprises a main valve cavity, the main valve body comprises an inlet, the multi-way reversing device further comprises a first valve port and a second valve port, the first valve port and the second valve port are arranged in the third valve hole or a communicating pipe communicated with the third valve hole, the valve core is arranged between the first valve port and the second valve port in the axial direction of the third valve hole, the second valve port is adjacent to the inlet relative to the first valve port, and the valve core can open or close the second valve port; the slider is slidable with respect to the main valve seat to have two operating positions: the multi-way reversing device comprises a first working position and a second working position, and the positions of the multi-way reversing device and the slide block correspondingly comprise two working positions;

the multi-way reversing device can be switched between a first working position and a second working position, when the slide block is positioned at the first working position, the first valve hole is communicated with the inlet, the valve core can close the second valve port, the valve core enables the first valve port not to be communicated with the inlet, and the valve core enables the first valve port not to be communicated with the second valve hole;

when the slide block is located at a second working position, the first valve hole and the second valve hole are communicated through a cavity formed between the slide block and the main valve seat, so that a communication channel between the first valve hole and the second valve hole of the multi-way reversing device is communicated, the second valve port is opened by the valve core, and the first valve port is communicated with a space above the second valve port of the main valve cavity, so that the first valve port is communicated with the inlet.

The invention also discloses an air conditioning system, which comprises a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger and a throttling assembly, and further comprises a multi-way reversing device, wherein the multi-way reversing device comprises an inlet, a first valve hole, a second valve hole and a third valve hole, the inlet is communicated with an outlet of the first heat exchanger, the first valve hole is communicated with one port of the third heat exchanger, the second valve hole is communicated with the inlet of the compressor, the third valve hole is communicated with a communicating pipeline of the third heat exchanger and the second heat exchanger, and the throttling assembly is arranged on a communicating pipeline between the second heat exchanger and the third heat exchanger;

the air conditioning system at least comprises a first working state and a second working state, wherein in the first working state, the multi-way reversing device is in a first working position, the multi-way reversing device opens a communication channel of the inlet and the first valve hole, and closes a communication channel of the third valve hole and the second valve hole and closes a communication channel of the third valve hole and the inlet;

in the second working state, the multi-way reversing device is in a second working position, and the multi-way reversing device opens a communication channel between the first valve hole and the second valve hole and opens a communication channel between the third valve hole and the inlet.

Compared with the prior art, the multi-way reversing device is arranged in the air conditioning system, the multi-way reversing device is provided with the valve core, one way of the multi-way reversing device is disconnected, the other way of the multi-way reversing device is communicated, and the two ways after reversing are communicated in the other state, so that the layout of devices in the air conditioning system is relatively simplified.

[ description of the drawings ]

FIG. 1 is a schematic view of a first operating state of a first embodiment of a multiple-pass reversing device;

FIG. 2 is a schematic view of a first embodiment of a multiple-pass reversing device in a second operating state;

FIG. 3 is an enlarged partial schematic view of the one-way mechanism of FIG. 2;

FIG. 4 is a schematic perspective view of a valve cartridge of the one-way mechanism of FIG. 3;

FIG. 5 is a schematic view of a second embodiment of a multiple-pass reversing device in a first operating state;

FIG. 6 is a schematic view of the multi-way reversing device of FIG. 5 in a second operating state;

FIG. 7 is an enlarged schematic view of a one-way mechanism and a third communication tube of the multi-way reversing device shown in FIG. 5;

fig. 8 is a schematic diagram of an air conditioning system.

[ detailed description ] embodiments

Referring to fig. 1 to 6, the multi-way reversing device includes a pilot valve 1 and a main valve 2, where specific positions of the pilot valve 1 and the main valve 2 are respectively communicated through a pipeline, and when the pilot valve 1 is operated, the main valve 2 can switch a flow direction of a refrigerant therein. The main valve 2 comprises a main valve body 21, the main valve body 21 comprises an end cover 211 and a hollow tube 212, the end cover 211 is arranged at two end ports of the hollow tube 212 to close the two end ports of the hollow tube, the end cover 211 is provided with an interface communicated with the pilot valve 1, the hollow tube 212 comprises a first interface (not shown), a second interface (not shown), a third interface (not shown) and an inlet (not shown) which are arranged on the tube wall of the hollow tube, and the first interface, the second interface and the third interface are positioned at the same side of the hollow tube; the inlet is disposed generally opposite the second inlet. The main valve has a main valve chamber 22, and the main valve chamber 22 is surrounded by a hollow tube and an end cover. The main valve 2 further includes a first communicating pipe 201, a second communicating pipe 202, a third communicating pipe 203 and a fourth communicating pipe 204, wherein the first communicating pipe 201, the second communicating pipe 202 and the third communicating pipe 203 are connected with the first interface, the second interface and the third interface respectively to communicate with each part of the main valve chamber 22, and the fourth communicating pipe 204 is connected with the inlet to communicate with the main valve chamber 22; in practical application, the fourth communicating tube 204 may be communicated with an outlet of a compressor or an outlet of a condenser, the second communicating tube 202 may be communicated with an air suction port of the compressor, the first communicating tube 201 may be communicated with a heat exchanger, and the third communicating tube 203 may be communicated with another heat exchanger.

The main valve 2 further includes a main valve seat 23, the main valve seat 23 is disposed in the main valve chamber 22, an upper side portion of the main valve seat 23 is substantially a rectangular plane, a lower side portion of the main valve seat 23 is substantially the same shape as an inner wall of the main valve body, the lower side portion of the main valve seat 23 contacts with the inner wall of the main valve body 21 and is fixed integrally with the inner wall of the main valve body 21 by welding, bonding, or the like, the main valve seat 23 is disposed opposite to the inlet, specifically, the upper side portion of the main valve seat 23 faces the inlet or the interface faces the upper side portion of the main valve seat 23; the main valve seat 23 includes a first valve hole 231, a second valve hole 232, and a third valve hole 233 penetrating upper and lower side portions of the main valve seat 23, axes of the first valve hole 231, the second valve hole 232, and the third valve hole 233 are parallel, and the first valve hole, the second valve hole, and the third valve hole may be regular holes, such as a circular hole, an elliptical hole, a square hole, or an irregular hole. In the axial direction of the main valve body, the second valve hole is located between the first valve hole and the second valve hole, the opening center of the first valve hole, the second valve hole and the third valve hole at the upper side of the main valve seat 23 is approximately located on the lateral axis of the upper side of the main valve seat 23, the hole diameters of the three valve holes may be equal or unequal, and in the present embodiment, the three valve holes are circular holes with the same hole diameter. The first valve hole 231 is communicated with the first port and communicated with the first communication pipe 201, the second valve hole 232 is communicated with the second port and communicated with the second communication pipe 202, the third valve hole 233 is communicated with the third port and communicated with the third communication pipe 203, or the first communication pipe, the second communication pipe and the third communication pipe are respectively communicated with corresponding parts of the main valve cavity through the first valve hole, the second valve hole and the third valve hole. It will be appreciated that the first, second and third valve openings may not be collinear at the upper lateral opening center, and that the opening center of any one valve opening may be offset from the upper lateral axis of the main valve seat.

The main valve 2 further comprises a first piston 24, a second piston 24, a sliding block 25 and a connecting rod 26, wherein the first piston 24 and the second piston 24 are fixedly connected with two ends of the connecting rod, the sliding block 25 is limited on the connecting rod 26, and when the connecting rod acts under the action of pressure difference at two ends of the piston, the sliding block 25 slides along with the action of the connecting rod under the driving of the piston. The lower side of the slide block 25 contacts with the upper side of the main valve seat 23 and slides relative to the main valve seat 23, and the main valve seat 23 and the slide block 25 form a pair of kinematic pairs. Wherein the slider 25 divides the main valve chamber 22 into a first and a second chamber 220 which are substantially not in communication, the second chamber 220 being located between the slider 25 and the main valve seat 23, the remainder of the main valve chamber 22 being the first chamber, wherein at least part of the second valve bore is located below the second chamber 220, the second valve bore 232 being in communication with the second chamber 220, and the inlet being in communication with the first chamber. The piston 24 and the inner wall of the main valve body 21 move relatively to form a pair of kinematic pairs, wherein the first and second pistons 24 divide the first cavity into a left cavity 221, a right cavity 222 and a middle cavity 223, the left cavity 221 is the left side of the first piston on the left side of the figure, the right cavity 222 is the right side of the first piston on the right side of the figure, the middle cavity 223 is located between the first piston and the second piston, and the positions of the three cavities can change along with the actions of the first piston, the connecting rod and the slider; specifically, the main valve seat 23 and the slider 25 are located in the middle chamber 223, the inlet is located between the first piston and the second piston, and the inlet is communicated with the middle chamber 223. It can be seen that when the fourth communication pipe 204 is in communication with the compressor outlet, the middle chamber 223 is a high pressure region, and the fourth communication pipe 204 is disposed on the opposite side of the main valve seat 23, so that the high pressure facilitates the sealing between the slider 25 and the main valve seat 23. According to the technical scheme, the left and right directions are transverse, and the directions from the inside of paper to the outside of paper or from the outside of paper to the inside of paper are longitudinal; or the sliding direction of the sliding block is transverse, and the direction vertical to the sliding direction of the sliding block is longitudinal.

Referring to fig. 1 to 4, the multi-way reversing device further includes a one-way mechanism 27, the one-way mechanism 27 includes a first valve seat 271, a second valve seat 272 and a valve core 273, the first valve seat 271 and the second valve seat 272 are disposed in the third valve hole 233, the first valve seat 271 is far away from the slider 25 relative to the second valve seat 272 in the axial direction of the first valve hole, specifically, the first valve seat 271 and the second valve seat 272 are respectively fixed to the inner wall of the third valve hole 233 in a manner of welding, bonding or screwing, the first valve seat 271, the second valve seat 272 and the third valve hole 233 are fixed in a sealing manner, or the refrigerant of the multi-way reversing device cannot flow into the chamber from the main valve chamber through the fixing position of the first valve seat and the third valve hole and/or the fixing position of the second valve seat and the third valve hole, or the refrigerant of the multi-way reversing device cannot flow into the chamber from the main valve 203 through the fixing position of the first valve seat and the third valve hole and/or the fixing position of the second valve seat and the third valve hole, wherein the second valve seat 272 does not protrude from the upper side portion of the main valve seat 23 to prevent the block from obstructing the relative sliding of the slider and the main valve seat 23. The one-way mechanism 27 further includes a housing chamber 274, and the wall forming the housing chamber 274 includes a first valve seat 271 and a second valve seat 272, and in this embodiment, the first valve seat 271 and the second valve seat 272 are in contact, and the wall forming the housing chamber 274 includes an inner wall of the first valve seat 271 and an inner wall of the second valve seat 272, and in other embodiments, the first valve seat 271 and the second valve seat 272 may be partially in contact or not in contact, and the wall forming the housing chamber 274 includes an inner wall of the first valve seat 271, an inner wall of the second valve seat 272, and an inner wall of the third valve hole 233.

The first valve seat 271 comprises a first valve port 2711, the first valve port 2711 penetrates through the first valve seat 271 in the axial direction of the first valve hole 233, an opening of the first valve port 2711 on the side opposite to the slider 25 can be communicated with the middle cavity 223 or the second cavity 220, the other side of the first valve port 2711 can be opened or closed by the valve core 273, and the opened first valve port 2711 can be communicated with the accommodating cavity 274; the second valve seat 272 includes a second valve port 2721, the second valve port 2721 penetrates the second valve seat 272 in the axial direction of the first valve hole, and the second valve port 2721 communicates with the third communication pipe 203 and the accommodation chamber 274. In other embodiments, the first valve seat 271 may be integrally formed with the main valve seat 23, the second valve seat 272 may be a separate member, and the second valve seat 272 may be fixed to the inner wall of the third valve hole 233 by welding, bonding, or screwing; alternatively, the second valve seat 272 and the main valve seat 23 are integrated, the first valve seat 271 is a separate component, and the first valve seat 271 is fixed to the inner wall of the third valve hole 233 by welding, bonding, or screwing.

A spool 273 is provided in the housing chamber 274, and the spool 273 is slidable in the axial direction of the third valve hole 233 in the housing chamber 274. Specifically, the valve core 273 includes a first through hole 2731, a neck portion 2732 and a sliding portion 2733, the neck portion 2732 is located at an end of the valve core opposite to the second valve port 2721 and can close or open the second valve port 2721, the neck portion 2732 and the second valve port 2721 are substantially the same in shape, for example, the neck portion 2732 is tapered, the second valve port 2721 is also substantially tapered in the same direction, when the neck portion 2732 seals the second valve port, at least a portion of the neck portion extends into the second valve port, and the inclined wall of the neck portion presses against the inclined wall of the first valve port to form a wall portion seal; or one side part of the neck part, which is relatively adjacent to the second valve port, is a plane, the peripheral side of the second valve port, which is relatively adjacent to the neck part, is a plane, and when the neck part seals the second valve port, the peripheral side of the second valve port is pressed by the side part of the neck part, which is relatively adjacent to the second valve port, so that a wall part seal is formed; or the second valve port is a step hole, at least part of the neck part extends into the second valve port, and the neck part presses the step wall of the second valve port relatively to the side wall and/or the end wall adjacent to the second valve port to form wall part sealing. In other embodiments, when the neck portion seals the second valve port, the portion of the neck portion contacting the second valve seat is further provided with a sealing ring to enhance the sealing effect. It will be appreciated that neck 2732 closes the second port, the receiving chamber and/or the first communication opening cannot communicate with chamber 223 through second port 2721, neck 2732 opens the second port, and the receiving chamber can communicate with chamber 223 through second port 2721.

The first communication hole 2731 is located at a substantially central portion of the valve body 273, the first communication hole 2731 is coaxially disposed with the first valve port 2711, the first opening 27311 of the first communication hole 2731 is disposed at an end wall of the valve body relatively far from the second valve port, the first opening 27311 faces the first valve port, the first communication hole 2731 is communicated with the first valve port 2711 through the first opening 27311, the second opening 27312 of the first communication hole 2731 is disposed at a side wall of the neck portion, or the second opening 27312 of the first communication hole 2731 is disposed at a side wall of the valve body between the neck portion and the sliding portion, the first communication hole is communicated with the accommodating chamber 274 through the second opening 27312, or the first valve port 2711 is communicated with the accommodating chamber 274 around the second opening 27312 through the first communication hole; the second opening 27312 of the first communication hole is at least one, may be two openings, or multiple openings, and may be regularly arranged on the side wall of the valve element, or irregularly arranged on the side wall of the valve element; the first communication hole may be a straight hole or a stepped hole. Along with the sliding of the valve core in the accommodating cavity, the accommodating cavity can be correspondingly changed, such as the shape of the accommodating cavity.

A sliding portion 2733 of the valve body is located at an opposite end of the neck portion 2732, the sliding portion 2733 is in contact with an inner wall of the first valve seat and/or the second valve seat and slides relative to the first valve seat and/or the second valve seat, and the sliding portion 2733 may also be in contact with an inner wall of the third valve hole 233 and slide relative to the third valve hole; in this embodiment, the radial area of the sliding portion 2733 is greater than the radial area of the spool side wall where the second opening 27312 is located, and is also greater than the radial area of the neck portion 2732. In other embodiments, the first valve seat 271 further includes a first perforated boss (not shown), the perforated boss of the first valve seat is located on a side of the first valve seat opposite to the adjacent receiving cavity and located on a peripheral side of the first valve port, or the first valve port 2711 penetrates through the boss of the first valve seat 271, the perforated boss of the first valve seat 271 extends into the first through hole 2731 of the valve core, the perforated boss of the first valve seat 271 can contact with an inner wall of the first through hole, and the valve core 273 slides along a side wall of the perforated boss of the first valve seat 271, at this time, the sliding portion 2733 can also not contact with the inner wall of the first valve seat and/or the second valve seat or the third through hole, and a radial area of the sliding portion 2733 can also be equal to or smaller than a radial area of a side wall of the valve core and/or a radial area of the neck portion where the second opening 27312 is located.

The one-way mechanism 27 further comprises an elastic member 275, the elastic member 275 comprising a first end, a second end and a through hole at a central portion of the elastic member, the elastic member 275 may be an elastic device such as a spring or a bellows. The first end of the elastic element 275 is fixed to the peripheral side of the first valve port, which is adjacent to the receiving chamber, and the second end of the elastic element 275 is fixed to the end wall of the first communication hole. The end wall of the first communicating hole 2731 and/or the circumferential side of the first valve port are/is provided with grooves, the grooves are approximately annular, the grooves are matched and installed with the first end part and the second end part of the elastic element 275, when the multi-way reversing device works, the elastic element can be prevented from radially sliding relative to the end wall of the accommodating hole, so that the radial stress of the valve core is prevented from being uneven, the valve core is prevented from being eccentric, internal leakage is avoided, and the working reliability of the system is ensured; the second end of the elastic element may be fixed to the peripheral side of the first opening, or the second end of the elastic element may be fixed to the end wall of the valve element opposite to the end wall adjacent to the second valve port. In other embodiments, a first perforated boss is disposed on the periphery of the first valve port 2711, a second perforated boss is disposed on the end wall of the first communication hole 2731, the outer diameters of the first perforated boss and the second perforated boss are substantially equal to the inner diameter of the elastic element, the first perforated boss and the second perforated boss are respectively embedded into the two ends of the elastic element 275, the elastic element 275 is prevented from sideslipping, the radial force of the valve core 273 is prevented from being uneven, and side leakage is avoided. The one-way mechanism 27 may also be provided with an elastic element 275 between the second valve seat and the valve core, and when the refrigerant of the multi-way reversing device flows from the third communicating pipe 203 to the main valve cavity 22, the valve core can effectively move upwards under the elastic force of the elastic element, so as to improve the sensitivity of the valve core; when the refrigerant of the multi-way reversing device flows from the middle chamber 223 to the third communication pipe 203 and the valve core 273 closes the second valve port 2721, the elastic element 275 can increase the pressure of the valve core 273 against the second valve port or the peripheral side thereof, thereby improving the sealing effect of the valve core 273 against the second valve port 2721. It can be known that the first end of the elastic element 275 is fixed to the peripheral side of the second valve port, the second end of the elastic element is fixed to the sliding portion, or the neck portion extends into the second end of the elastic element, wherein when the elastic element is a corrugated tube, the side portion of the corrugated tube needs to be provided with a plurality of openings, so that the corrugated tube can be circulated inside and outside.

Referring to the second embodiment of the multi-way reversing device shown in fig. 5 to 7, compared to the first embodiment, the first valve seat 271, the second valve seat 272, and the valve body 273 are provided in the third communication pipe 203 communicating with the third valve hole 233. The first valve seat 271 and the second valve seat 272 are both discrete components, the first valve seat 271 and the second valve seat 272 are fixed to the third communication pipe 203 by welding and bonding, the second valve seat 272 is adjacent to the main valve seat 23 relative to the first valve seat 271, the one-way mechanism 27 divides the third communication pipe cavity into a third cavity 2031 and a fourth cavity 2032, the third cavity 2031 is communicated with the third valve hole 233 and the second valve port 2721, and the fourth cavity 2032 is communicated with the first valve port and a corresponding pipe communicated with the third communication pipe. The valve core 273 opens the second valve port, the third cavity is communicated with the fourth cavity, and the third valve hole can be communicated with the fourth cavity through the opened second valve port; the spool 273 closes the second port 2721 and the third chamber is not in communication with the fourth chamber. It is noted that the wall forming the receiving chamber 274 includes at least the first valve seat 271 and the second valve seat 272, and if the first valve seat 271 and the second valve seat 272 are in contact, the wall forming the receiving chamber 274 includes the inner wall of the first valve seat 271 and the inner wall of the second valve seat 272, and in other embodiments, the first valve seat 271 and the second valve seat 272 may be in partial contact or in incomplete contact, and the wall forming the receiving chamber 274 includes the inner wall of the first valve seat 271, the inner wall of the second valve seat 272, and the inner wall of the third communication pipe 203.

In other embodiments, the tube wall of the third communication tube 203 further includes a first concave area 2033 and a second concave area 2034, and the radial areas of the first concave area 2033 and the second concave area 2034 are relatively smaller than the radial area of the fixing position of the one-way mechanism 27 and the third communication tube; in the third valve-hole axial direction, the check mechanism 27 is disposed between the first depressed area and the second depressed area; a sealing ring is further disposed at a fixed position of the second valve seat 272 and the third communication pipe 203 to enhance a sealing effect between the first valve seat 271 and the third communication pipe 203, and similarly, a sealing ring may be disposed at a fixed position of the first valve seat 271 and the third communication pipe 203 to enhance a sealing effect between the first valve seat 271 and the third communication pipe 203.

Referring to fig. 5 and 6, the pilot valve 1 comprises a pilot valve body 11 and a pilot valve seat 12, the pilot valve seat 12 being arranged in the pilot valve body 11, in particular the pilot valve seat 12 being fixed to an inner wall of the pilot valve body 11. The pilot valve 1 is provided with a pilot valve cavity which is surrounded by a pilot valve body. The pilot valve body 11 comprises four ports, wherein three ports are arranged on the side wall of the pilot valve body 11, one port is arranged on the end wall of the pilot valve body 11, and the three ports arranged on the side wall of the pilot valve body 11 are arranged from left to right. The pilot valve seat 12 includes three through holes penetrating through upper and lower side portions of the pilot valve seat 12, the three through holes communicating with three ports provided in a side wall of the pilot valve body 11. The pilot valve 1 further comprises a first capillary 111, a second capillary 112, a third capillary 113 and a fourth capillary 114, one end of a first capillary tube 111 is communicated with a leftmost interface of the side wall of the pilot valve body 11 and is communicated with a corresponding part of the pilot valve cavity, the other end of the first capillary tube 111 is connected with a left end cover interface of the main valve body 21 and is communicated with a left cavity, one end of a second capillary tube 112 is communicated with a middle interface of the side wall of the pilot valve body 11 and is communicated with a corresponding part of the pilot valve cavity, the other end of the second capillary tube 112 is communicated with a second communicating tube 202, one end of a third capillary tube 113 is communicated with a right side interface of the side wall of the pilot valve body 11 and is communicated with the pilot valve cavity, the third capillary tube 113 is connected with a right end cover interface of the main valve body and is communicated with the right cavity, one end of a fourth capillary tube 114 is communicated with an end wall interface of the pilot valve body 11 and is communicated with the pilot valve cavity, and the fourth capillary tube 114 is communicated with a fourth communicating tube 204. The pilot valve 1 further comprises a sleeve 13 and an electromagnetic coil 14, the sleeve 13 is connected with the right end of the pilot valve body 11, and the electromagnetic coil 14 is arranged on the outer side of the sleeve 13; the pilot valve 1 further comprises a spring 15, a core iron 16 and a valve bowl 17, the core iron 16 and the valve bowl 17 are connected into a whole, the valve bowl 17 is provided with a cavity communicated with a through hole of a pilot valve seat, the spring 15 is in contact with the core iron 16, and the valve bowl 17 slides along the pilot valve seat 12 under the driving of the core iron. In other embodiments, only one of the first capillary tube 111 and the third capillary tube 113 may be present, and in a working state of the multi-way reversing device, a high-pressure refrigerant enters the pilot valve cavity through the fourth capillary tube, and along with the movement of the sliding bowl, the high-pressure refrigerant in the pilot valve cavity enters the first capillary tube, and the low-pressure refrigerant of the second capillary tube is stopped by the valve bowl; in another working state of the multi-way reversing device, the low-pressure refrigerant of the second capillary tube enters a cavity between the pilot valve seat and the sliding bowl, the low-pressure refrigerant is converged into the left cavity through the first capillary tube along with the movement of the sliding bowl, and the sliding block moves leftwards after the left cavity is relatively low in pressure with respect to the right cavity. Three capillary tubes are arranged between the pilot valve and the main valve, so that the function of the multi-way reversing device is realized, one capillary tube is relatively reduced, and the cost is saved.

In the first working state, the electromagnetic coil is electrified, the core iron 16 overcomes the acting force of the return spring 15 to drive the sliding bowl 17 to move to the right, the second capillary tube 112 and the third capillary tube 113 are communicated with a cavity between the valve bowl 17 and the valve seat of the pilot valve, the fourth capillary tube 114 is communicated with the first capillary tube 111, so that the left cavity 221 of the main valve 2 is a high-pressure area, the right cavity 222 is a low-pressure area, and a pressure difference is formed between the left cavity and the right cavity of the main valve 2, under the action of the pressure difference, the piston 24 drives the sliding block 25 to move to the right, and the position of the sliding block 25 at the rightmost side is defined as the first working position of the sliding block 25 and is also the first working position of the multi-way reversing device. The slide block is located at a first working position, the first valve hole 231 is communicated with the main valve cavity 22, or the first valve hole 231 is communicated with the fourth communicating pipe 204 through the middle cavity 223 of the main valve cavity 22, and the second valve hole 232 is communicated with the second cavity 220; the third valve hole 233 is communicated with the second chamber 220, the second chamber 220 communicated with the second communication pipe is relatively low pressure, the third communication pipe 203 communicated with at least the first valve port 2711 is relatively high pressure, or the first valve port 2711 is relatively high pressure with respect to the second valve port 2721, the valve core 273 is not communicated with the second valve port 2721 under the action of the pressure difference between the first valve port and the second valve port, or the pressure difference between the first valve port and the second valve port overcomes the elastic force of the spring, the neck 2732 extends into the second valve port 2721 to seal the second valve port 2721, the accommodating chamber 274 is not communicated with the second valve port 2721, and then the first valve port 2711 is not communicated with the second chamber 220, or the communication passage between the third valve hole 233 and the second chamber 220 is closed by the valve core 273, and the first valve port 2711 is also not communicated with the first chamber or the middle chamber 223.

In the second working state, the electromagnetic coil 14 of the pilot valve 1 is not electrified, the core iron 16 drives the sliding bowl 17 to move left under the pressure of the spring 15 of the pilot valve 1, the first capillary tube 111 and the second capillary tube 112 are communicated with the cavity between the valve bowl 17 and the pilot valve seat, the third capillary tube 113 is communicated with the fourth capillary tube 114, so that the left cavity 221 of the main valve 2 is a low-pressure area, the right cavity 222 is a high-pressure area, and a pressure difference is formed between the left cavity and the right cavity of the main valve 2, similarly, the piston 24 pushes the slide block 25 to the left under the action of the pressure difference, and the leftmost side of the slide block is defined as the second working position of the slide block and also as the second working position of the multi-way reversing device. When the slider 25 is located at the second working position, the second chamber 220 is located above the first valve hole 231 and the second valve hole 232, the first valve hole 231 and the second valve hole 232 are communicated with the second chamber 220, and the first communicating pipe 111 and the second communicating pipe 112 are communicated through the second chamber 220; the middle chamber is communicated with the fourth communication pipe 204, the third valve hole 233 is communicated with the middle chamber, at least one side of the second valve port 2721, which is relatively adjacent to the slider 25, is communicated with the middle chamber, the first valve port is communicated with the third communication pipe 203, the second valve port is at a high pressure relative to the first valve port, the spool 273 is communicated with the second valve port 2711, or the spool 273 is communicated with the second valve port 2721, the neck 2732 is positioned below the second valve port 2721, the second valve port 2721 is opened, the accommodating chamber 274 is communicated with the second valve port 2721, and then the first valve port 2711 is communicated with the second valve port 2721, or the middle chamber 223 communicated with the second valve port 2721 is communicated with the third communication pipe 203, or the third communication pipe 203 is communicated with the fourth communication pipe 204 through the main valve chamber 22.

Referring to fig. 8, fig. 8 is a schematic diagram of an air conditioning system. An air conditioning system comprises a compressor 5, a gas-liquid separator 6 positioned at an air inlet of the compressor, a first heat exchanger 9 connected with an air outlet of the compressor, a second heat exchanger 3, a third heat exchanger 4, a multi-way reversing device and a throttling assembly; the multi-way reversing device comprises a first valve hole, a second valve hole, a third valve hole and a fourth valve hole, or the multi-way reversing device further comprises a first communicating pipe 201 communicated with the first valve hole, a second communicating pipe 202 communicated with the second valve hole, a third communicating pipe 203 communicated with the third valve hole and a fourth communicating pipe 204 communicated with an inlet, the inlet or the fourth communicating pipe 204 is communicated with the other interface of the first heat exchanger 9, the first valve hole or the first communicating pipe 201 is communicated with the third heat exchanger 4, the second valve hole or the second communicating pipe 202 is communicated with a compressor suction port or communicated with the compressor suction port through a gas-liquid separator 6, the third valve hole or the third heat exchanger 4 is communicated with the third communicating pipe 203 after being communicated with a first expansion valve 7 and a first expansion valve 81 which are connected in parallel, the third valve hole or the third communicating pipe 203 is communicated with the second heat exchanger through a second expansion valve 82 at the same time, the second expansion valve 82 is communicated with an interface of the third heat exchanger 3, the other interface of the third heat exchanger 3 is communicated with a compressor suction port or communicated with the compressor suction port through a gas-liquid separator 6; the third communication pipe 203 communicates with the piping between the first throttling element 82 and the second throttling element 81 or communicates with the piping between the first throttling element 82 and the second throttling element 81 through a control valve. The check valve 7 is turned on when the fluid flows from the third heat exchanger to the third communication pipe 203, and is turned off when the fluid flows from the third communication pipe 203 to the third heat exchanger; in addition, the expansion valve may be an expansion valve having a communicating function, or may have a direct communicating function, so that the check valve may be eliminated, for example, if the second throttling element 81 has a direct communicating function in one direction, the fluid is communicated in the direction from the third heat exchanger to the third communication pipe 203, and the second throttling element 81 is in a throttling state in the direction from the third communication pipe 203 to the third heat exchanger. In addition, the connection or communication described in this specification may be direct connection or communication, for example, two components may be assembled together, so that a connection pipeline may not be required, and the system is more compact, or may be indirect connection or communication, for example, communication through a pipeline, or communication after passing through a certain component, which is not illustrated herein; in the technical solution of the present invention, the opening of the second throttling means that the opening of the second throttling means 81 is the largest, the closing of the throttling means that the opening of the throttling means is zero, and the opening of the throttling means the state between opening and closing, or the throttling state of the throttling means.

When the indoor space needs to be refrigerated in summer, a first working state of the air conditioning system is started, in the first working state, the multi-way reversing device is in a first working position, the multi-way reversing device opens a communication channel between an inlet and a first valve hole or a first communication pipe, and closes a communication channel between a third valve hole and a second valve hole and closes a communication channel between the third valve hole and the inlet; or, in the first operating state of the air conditioning system, the fourth communication pipe 204 is communicated with the first communication pipe 201, the second communication pipe 202 is not communicated with the third communication pipe 203, and the first heat exchanger 9 is communicated with the third heat exchanger 4. In the cooling mode, the opening of the damper 902 of the first heat exchanger 9 is zero, so that the air duct is bypassed and the air does not pass through the first heat exchanger 9. When the high-temperature and high-pressure gaseous refrigerant comes out of the compressor and passes through the first heat exchanger 9, as no wind passes through the refrigerant, the refrigerant passing through the first heat exchanger basically does not exchange heat with air; in this way, the refrigerant flows into the first communication pipe 201 communicated with the third heat exchanger 4 through the fourth communication pipe 204 of the multi-way reversing device, then flows into the third heat exchanger, where the refrigerant exchanges heat with air, passes through the check valve 7 after discharging heat to the air, and then is throttled by the second expansion valve 82, and is changed into a low-temperature and low-pressure refrigerant, and enters the second heat exchanger 3, where the refrigerant exchanges heat with indoor air, absorbs the redundant heat in the room, and achieves the purpose of cooling. After passing through the second heat exchanger 3, the refrigerant is changed into a low-temperature low-pressure gaseous fluid or a low-temperature low-pressure gas-liquid two-phase fluid, the low-temperature low-pressure gaseous refrigerant (in a saturated or overheated state) returns to the compressor 5, the compressor 5 applies work, and the low-temperature low-pressure gaseous refrigerant is changed into a high-temperature high-pressure gaseous refrigerant, so that a refrigeration cycle is formed. The first expansion valve or the second expansion valve can be a thermal expansion valve or an electronic expansion valve or a throttle pipe; in addition, in this embodiment, in order to ensure the throttling effect of the refrigerant fluid, the throttling component is preferably an electronic expansion valve capable of performing throttling in a bidirectional flow manner.

When heat is needed indoors in winter, the air conditioning system enters a second working state, in the second working state, the multi-way reversing device is located at a second working position, the multi-way reversing device opens a communication channel between the first valve hole and the second valve hole and opens a communication channel between the third valve hole and an inlet, or a fourth communication pipe 204 is communicated with a third communication pipe 203, and the first communication pipe 201 is communicated with the second communication pipe 202. At this time, the damper 902 can be opened to the maximum to avoid the wind from bypassing the first heat exchanger 9, and the flow of the refrigerant circulation loop is as follows: the high-temperature high-pressure gaseous refrigerant flows out of the compressor 5 and passes through the first heat exchanger 9, the passing air exchanges heat with the high-temperature high-pressure gaseous refrigerant of the first heat exchanger 9, and the air flows into the room after being heated so as to heat the temperature in the room; after absorbing the cold energy in the air, the refrigerant flows into the pipeline between the first expansion valve 81 and the second expansion valve 82 through the third communicating pipe 203 of the multi-way reversing device, and whether the refrigerant enters the evaporator can be controlled by the second expansion valve 82 in front of the second heat exchanger 3; the refrigerant enters the first expansion valve 81, so that the refrigerant is changed into low-temperature and low-pressure fluid and reaches the third heat exchanger 4, and the outdoor fan is started in the third heat exchanger 4 to enable the refrigerant to exchange heat with external air in the third heat exchanger 4; the refrigerant of the third heat exchanger absorbs the heat in the outside air and then enters the first communicating pipe 201 of the multi-way reversing device, then returns to the gas-liquid separator 6 through the second communicating pipe 202, the low-temperature and low-pressure gaseous refrigerant (in a saturated or overheated state) returns to the compressor, the compressor 5 applies work, and then the low-temperature and low-pressure gaseous refrigerant is changed into the high-temperature and high-pressure gaseous refrigerant to form a heat pump cycle; if the liquid refrigerant is not completely evaporated when passing through the gas-liquid separator, the liquid refrigerant is stored in the gas-liquid separator, so that the influence of liquid impact or supercooling of the compressor on the efficiency of the heat pump system is avoided. If the heating capacity of the first heat exchanger cannot meet the indoor comfort requirement, the heater 901 may be turned on simultaneously to perform electric heating for supplement, so as to meet the indoor comfort requirement. In addition, if the second expansion valve 82 in front of the second heat exchanger is opened, part of the refrigerant enters the second heat exchanger through the second expansion valve 82, part of the heat is absorbed, so that the moisture is condensed and separated out to form a dehumidification effect, and the air is kept dry and comfortable, so that the dehumidification function can be realized. The multi-way reversing device is introduced into the air conditioning system, so that the refrigerating and heating functions of the air conditioning system are realized, the application number of the stop valves in the air conditioning system is reduced, the layout difficulty of the stop valves is reduced, and the control process of the air conditioning system is simplified.

In the second embodiment, the third valve hole or the third communicating pipe 203 may also directly communicate with the pipe between the other port of the third heat exchanger and the first throttling element 82, or the air conditioning system does not include the second throttling element 81 and the check valve 7. When the air conditioning system is in a first working state, the multi-way reversing device opens a communication channel between the fourth communication pipe 204 and the first communication pipe 201, opens the first throttling element 82, and closes the air door 902, and in the first working state of the air conditioning system, the first heat exchanger 9 is only a refrigerant circulation channel, the third heat exchanger 4 is used as a condenser to release heat, and the second heat exchanger 3 is used as an evaporator to release cold; the air conditioning system may also open damper 902 or partially open damper 902, the first heat exchanger exchanges heat with the airflow, and the first heat exchanger also functions as a condenser to release cold to heat the airflow. When the air conditioning system is in a second working state, the multi-way reversing device opens a communication channel between the first communication pipe 201 and the second communication pipe, opens a communication channel between the fourth communication pipe 204 and the third communication pipe 203, opens the first throttling element, opens the air door 902, the first heat exchanger is used as a condenser to release heat, a refrigerant part flowing out of the third communication pipe 203 flows into the third heat exchanger 4, and the third heat exchanger 3 is used as a condenser; part of the refrigerant enters the second heat exchanger 3 after being throttled by the first throttling element 82, and the second heat exchanger 3 serves as an evaporator.

In the third embodiment, compared with embodiment 1, the air conditioning system may not include the check valve 7, in the first operating state of the air conditioning system, the second throttling device 81 is opened, in the second operating state of the air conditioning system, the first throttling device 82 may be closed, the second throttling device 81 is opened, the first heat exchanger is used as a condenser to release heat, the second heat exchanger is not involved in heat exchange, and the third heat exchanger is used as an evaporator to release cold.

Compared with the prior art, the multi-way reversing device is provided with the valve core capable of closing at least one valve hole, and can be in one state; the multi-way reversing device is used for adjusting the flow direction of the refrigerant in the air conditioning system, the temperature adjusting function of the air conditioning system is realized, and the layout difficulty and the cost of devices in the air conditioning system are favorably reduced.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

1. A multi-way reversing device comprises a main valve, wherein the main valve comprises a main valve body, a main valve seat, a sliding block and a valve core, the main valve seat is fixed with the main valve body, the main valve seat comprises a first valve hole, a second valve hole and a third valve hole, the main valve comprises a main valve cavity, the main valve body comprises an inlet, the multi-way reversing device further comprises a first valve port and a second valve port, the first valve port and the second valve port are arranged in the third valve hole or a communicating pipe communicated with the third valve hole, the valve core is arranged between the first valve port and the second valve port in the axial direction of the third valve hole, the second valve port is adjacent to the inlet relative to the first valve port, and the valve core can open or close the second valve port; the slider is slidable with respect to the main valve seat to have two operating positions: the multi-way reversing device comprises a first working position and a second working position, and the positions of the multi-way reversing device and the slide block correspondingly comprise two working positions;

2. The multi-way reversing device of claim 1, wherein the valve cartridge includes a neck portion, the neck portion is located at one end of the valve cartridge, when the slider is in the first operating position, at least a portion of the neck portion extends into the second valve port, and a sidewall and/or an end wall of the neck portion seals the second valve port; or the end wall of the neck part, which is relatively adjacent to the second valve port, is a plane, the peripheral side of the second valve port, which is relatively adjacent to the neck part, is a plane, and when the multi-way reversing device is in the first working position, the end wall of the neck part seals the second valve port.

3. The multi-way reversing device according to claim 2, wherein the valve body includes a first communication hole and a sliding portion, the sliding portion is away from the second valve port relative to the neck portion in the axial direction of the third valve hole, the first communication hole is located in a central portion of the valve body, a first opening of the first communication hole is located in an end wall of the other end of the valve body, the first opening faces the first valve port and is communicated with the first valve port, a second opening of the first communication hole is located in a side wall of the neck portion, or the second opening of the first communication hole is located in a side wall of the valve body between the neck portion and the sliding portion, and the second opening of the first communication hole is located below the second valve port in the axial direction of the third valve hole.

4. The multi-way reversing device according to claim 3, wherein the spool comprises a first communication hole, the main valve comprises a first valve seat, a second valve seat and a receiving chamber, in the axial direction of the third valve hole, the second valve seat is adjacent to the slider relative to the first valve seat, the first valve seat comprises a first valve port, the second valve seat comprises a second valve port, the wall forming the receiving chamber comprises at least a first valve seat and a second valve seat, the spool is slidable in the receiving chamber, and the first valve port can communicate with the receiving chamber through the second opening of the first communication hole; the main valve cavity comprises a first cavity and a second cavity, the cavity formed between the sliding block and the main valve seat is the second cavity, the first cavity comprises a left cavity, a middle cavity and a right cavity, the middle cavity is communicated with the inlet, and the second cavity is at least communicated with the second valve hole;

when the multi-way reversing device is in a first working position, the second cavity is correspondingly positioned in the first working position, the valve core closes the second valve port, the accommodating cavity is not communicated with the middle cavity, and the first valve hole is communicated with the inlet through the middle cavity; when the multi-way reversing device is in a second working position, the second cavity is correspondingly positioned in the second working position, the first valve hole is communicated with the second valve hole through the second cavity, the middle cavity is communicated with the inlet, the valve core opens the second valve hole, and the accommodating cavity is communicated with the middle cavity through the second valve port.

5. The multi-way reversing device according to claim 4, wherein in an axial direction of the main valve body, the second valve hole is located between the first valve hole and the third valve hole, the first valve seat and the second valve seat are fixed with an inner wall of the third valve hole, in the axial direction of the third valve hole, the second valve seat does not exceed the third valve hole, a wall forming the accommodating cavity comprises an inner wall of the first valve seat, an inner wall of the second valve seat, or a wall forming the accommodating cavity comprises an inner wall of the first valve seat, an inner wall of the second valve seat and an inner wall of the third valve hole; the sliding part slides along the inner wall of the first valve seat and/or the inner wall of the second valve seat or the inner wall of the third valve hole; or the first valve seat further comprises a boss, the first valve port penetrates through the boss of the first valve seat, the boss of the first valve seat extends into the first opening, and the sliding part slides along the boss of the first valve seat;

or the first valve seat and the second valve seat are arranged on the inner wall of a communicating pipe communicated with the third valve hole, the wall forming the accommodating cavity comprises the inner walls of the first valve seat and the second valve seat, or the wall forming the accommodating cavity comprises the inner walls of the first valve seat, the second valve seat and the communicating pipe, and the sliding part slides along the inner wall of the first valve seat and/or the inner wall of the second valve seat or the inner wall of the communicating pipe communicated with the third valve hole; or the first valve seat further comprises a boss, the first valve port penetrates through the boss of the first valve seat, the boss of the first valve seat extends into the first opening, and the sliding part slides along the boss of the first valve seat.

6. The multi-way reversing device according to claim 5, wherein a tube wall of a communication tube communicating with the third valve hole includes a first recessed area and a second recessed area, the first recessed area is located below the first valve seat, the second recessed area is located above the second valve seat in an axial direction of the third valve hole, a sealing member is disposed between the second valve seat and the communication tube, and a sealing member is disposed between the first valve seat and the communication tube.

7. The multi-way reversing device according to claim 4, further comprising an elastic element disposed in the accommodating cavity, the elastic element including a first end and a second end, the first end of the elastic element being fixed to a peripheral side of the first valve port, and the second end of the elastic element being fixed to the valve core; or the first end of the elastic element is fixed with the peripheral side of the second valve port, and the second end of the elastic element is fixed with the neck part of the valve core or the sliding part of the valve core.

8. The multi-way reversing device according to claim 5, further comprising an elastic element disposed in the receiving cavity, the elastic element including a first end and a second end, the first end of the elastic element being fixed to a peripheral side of the first valve port, the second end of the elastic element being fixed to the valve core; or the first end of the elastic element is fixed with the peripheral side of the second valve port, and the second end of the elastic element is fixed with the neck part of the valve core or the sliding part of the valve core.

9. The multi-way reversing device according to claim 6, further comprising an elastic element disposed in the receiving cavity, the elastic element including a first end and a second end, the first end of the elastic element being fixed to a peripheral side of the first valve port, the second end of the elastic element being fixed to the valve core; or the first end of the elastic element is fixed with the peripheral side of the second valve port, and the second end of the elastic element is fixed with the neck part of the valve core or the sliding part of the valve core.

10. The multi-way reversing device according to any one of claims 7 to 9, wherein the main valve further comprises a first communicating pipe, a second communicating pipe, a third communicating pipe and a fourth communicating pipe, the first communicating pipe and the second communicating pipe penetrate through the main valve body to be communicated with the first valve hole and the second valve hole, the communicating pipe communicated with the third valve hole is set as the third communicating pipe, and the fourth communicating pipe is communicated with the inlet;

the main valve further comprises a first piston and a second piston, the first piston and the second piston are relatively and fixedly connected, and the first piston and the second piston can drive the sliding block to slide when moving; the first piston and the second piston divide the first cavity into a left cavity, a right cavity and a middle cavity, the middle cavity is located between the first piston and the second piston, the left cavity is adjacent to the first piston relative to the right cavity, the right cavity is adjacent to the second piston relative to the left cavity, and the middle cavity is at least communicated with the fourth communicating pipe.

11. The multi-way reversing device according to claim 10, further comprising a pilot valve, wherein the multi-way reversing device comprises a first capillary tube, a second capillary tube, a third capillary tube and a fourth capillary tube, the first capillary tube, the second capillary tube, the third capillary tube and the fourth capillary tube are respectively communicated with different positions of the pilot valve, the first capillary tube is communicated with the left cavity, the second capillary tube is communicated with the second communicating tube, the third capillary tube is communicated with the right cavity, and the fourth capillary tube is communicated with the fourth communicating tube; in a first working position of the multi-way reversing device, the first capillary tube is communicated with the fourth capillary tube, and the second capillary tube is communicated with the third capillary tube; and in a second working position of the multi-way reversing device, the first capillary tube is communicated with the second capillary tube, and the third capillary tube is communicated with the fourth capillary tube.

12. An air conditioning system, the air conditioning system includes the compressor, the first heat exchanger, the second heat exchanger, the third heat exchanger and the throttle subassembly, the air conditioning system also includes the multi-way reversing device of any one of claims 1-11, the multi-way reversing device includes the import, the first valve hole, the second valve hole, the third valve hole, the import communicates with the export of the first heat exchanger, the first valve hole communicates with a port of the third heat exchanger, the second valve hole communicates with the import of the compressor, the third valve hole communicates with the third heat exchanger and the communicating pipe of the second heat exchanger, the throttle subassembly sets up the communicating pipe between the second heat exchanger and the third heat exchanger;

13. The air conditioning system of claim 12, wherein the throttling assembly includes a first throttling element disposed at an inlet of the second heat exchanger, and in the first operating condition, an outlet of the first heat exchanger communicates with a port of the third heat exchanger through the multi-pass reversing device, opening the first throttling element; in the second working state, the outlet of the first heat exchanger is communicated with the inlet of the first throttling element and the other port of the third heat exchanger through the multi-way reversing device, and the first throttling element is opened.

14. The air conditioning system of claim 13, wherein the throttle assembly further includes a second throttle member provided at the other port of the third heat exchanger, the third valve hole communicates with a line between the first throttle member and the second throttle member, the second throttle member is opened and the first throttle member is opened in the first operating state, and the first throttle member and the second throttle member are opened in the second operating state; the opening means that the opening degree of the second throttling element is the largest, and the opening means throttling element is in a state between finger opening and finger closing, or the throttling element is in a throttling state.

15. The air conditioning system of claim 14, further comprising a check valve disposed in parallel with the second throttling element to close the second throttling element and open the first throttling element in the first operating state.