Compressor and compression cycle system

Abstract

The application provides a compressor and a compression cycle system, the compressor comprising: a first cylinder, a second cylinder and a piston, the first cylinder and the second cylinder being sleeved to form an inner cavity, the piston reciprocating in the inner cavity, an annular groove being formed between the first cylinder and the second cylinder, a porous bearing sleeve being installed in the annular groove, the porous bearing sleeve being part of the inner cavity sidewall; the first cylinder being provided with a through hole to form a liquid supplementing port, the porous bearing sleeve being communicated with one end of the liquid supplementing port. The compressor provided by the application realizes the effects of lubrication, liquid supplementing, sealing and cooling of the compressor by the liquid entering the liquid supplementing port, reduces the temperature in the compression cavity and realizes oil-free operation of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration technology, in particular to a compressor and a compression cycle system. BACKGROUND

[0002] In the field of refrigeration technology, piston compressors are widely used due to their compact structure, good sealing performance and high volumetric efficiency, especially for multi-temperature zone small refrigeration devices. The traditional refrigeration piston compressor structure uses lubricating oil to achieve lubrication between the cylinder and the piston, gap sealing and cooling during the compression process, which makes it impossible to use in low or high temperature conditions.

[0003] The existing compressor that can realize air supplement needs to increase a heat exchanger before the air supplement port to convert the liquid refrigerant into a gaseous state before entering the compressor to supplement the air pressure of the compressor, which cannot directly supplement the liquid refrigerant into the compressor. SUMMARY

[0004] The present application provides a compressor and a compression cycle system to solve the defect that the liquid refrigerant cannot be directly supplemented into the compression chamber in the prior art. A liquid supplement port is formed on the first cylinder body, and a porous bearing sleeve is arranged between the liquid supplement port and the inner cavity, so that the liquid refrigerant can enter the inner cavity through the liquid supplement port and the porous bearing sleeve to supplement the liquid to the compressor, reduce the friction and leakage of the compressor, reduce the temperature in the compression chamber, realize oil-free operation of the compressor, and further reduce energy consumption and equipment size.

[0005] The present application provides a compressor, comprising: a first cylinder body, a second cylinder body and a piston, the first cylinder body and the second cylinder body are sleeved to form an inner cavity, the piston reciprocates in the inner cavity,

[0006] An annular groove is formed between the first cylinder body and the second cylinder body, and a porous bearing sleeve is installed in the annular groove, the porous bearing sleeve being part of the inner cavity side wall; the first cylinder body has a through hole forming a liquid supplement port, and the porous bearing sleeve communicates with one end of the liquid supplement port.

[0007] According to the compressor provided by the present application, an annular liquid inlet channel is formed on the first cylinder body, the annular liquid inlet channel and the annular groove are annularly communicated,

[0008] The liquid supplement port communicates with the porous bearing sleeve through the annular liquid inlet channel.

[0009] According to the compressor provided by the present application, an air suction valve is arranged at the front end of the piston, and an exhaust mechanism is arranged at the front end of the second cylinder body.

[0010] The compressor provided by the application comprises a driving mechanism and a shell, the driving mechanism drives the piston to make reciprocating motion in the inner cavity through a shaft coupling, and the compressor is arranged in the shell.

[0011] The compressor provided by the application comprises a pair of the compressors, the pair of the compressors are driven by a pair of the driving mechanisms, and the pair of the compressors are arranged in the same shell,

[0012] The driving mechanisms of the pair of the compressors are arranged in opposite directions.

[0013] The application further provides a compression cycle system comprising a first heat exchanger, a second heat exchanger and the above-mentioned compressor, the first heat exchanger, the second heat exchanger and the compressor form a cycle loop with a liquid supplement branch.

[0014] The compression cycle system provided by the application, the exhaust port of the compressor is connected with the first heat exchanger, the first heat exchanger comprises a first main branch and a first branch, the first main branch is connected with the second heat exchanger, and the first branch is connected with the liquid supplement port of the compressor,

[0015] The second heat exchanger is connected with the suction port of the compressor.

[0016] The compression cycle system provided by the application further comprises a first four-way valve and a first electromagnetic reversing valve, four interfaces of the first four-way valve are connected with the exhaust port, the first heat exchanger, the suction port and the second heat exchanger respectively, an inlet of the first electromagnetic reversing valve is connected with the first branch and the second heat exchanger respectively, an outlet of the first electromagnetic reversing valve is connected with the liquid supplement port, and the valve port switching of the first four-way valve and the first electromagnetic reversing valve realizes switching between a refrigeration state and a heating state,

[0017] In the refrigeration state, the exhaust port is connected with the first heat exchanger, the suction port is connected with the second heat exchanger, and the first branch is connected with the liquid supplement port; in the heating state, the exhaust port is connected with the second heat exchanger, the suction port is connected with the first heat exchanger, and the first branch of the second heat exchanger is connected with the liquid supplement port.

[0018] The compression cycle system provided by the application further comprises a second four-way valve and a third heat exchanger, the third heat exchanger comprises a first heat exchange side and a second heat exchange side, four interfaces of the second four-way valve are connected with the exhaust port and the suction port of the compressor, the first heat exchanger and the second heat exchanger respectively,

[0019] One end of the first heat exchange side is connected with the first heat exchanger, the other end is connected with the first main path of the second heat exchanger, one end of the second heat exchange side is connected with the second branch path of the second heat exchanger, the other end is connected with the liquid supplementing port, and the valve port switching of the second four-way valve realizes switching between the refrigeration state and the heating state.

[0020] The compression cycle system provided by the application further comprises a fourth heat exchanger, a second electromagnetic switching valve, a third electromagnetic switching valve and a fourth electromagnetic switching valve, the outlet of the second heat exchanger is connected with the suction port of the compressor, the inlet of the first heat exchanger is connected with the exhaust port of the compressor,

[0021] The second electromagnetic switching valve is connected with the outlet of the first heat exchanger, the inlet of the fourth heat exchanger and the fourth electromagnetic switching valve respectively, the third electromagnetic switching valve is connected with the outlet of the fourth heat exchanger, the inlet of the second heat exchanger and the fourth electromagnetic switching valve respectively, and the fourth electromagnetic switching valve is connected with the liquid supplementing port.

[0022] The compressor provided by the application realizes the effects of lubrication, liquid supplementing, sealing and cooling of the compressor by the liquid entering the liquid supplementing port into the inner cavity through the porous bearing sleeve according to the position of the piston and the porous bearing sleeve and the pressure difference, reduces the friction and leakage of the compressor, reduces the temperature in the compression cavity, realizes the oil-free operation of the compressor, and thus reduces the energy consumption and the size of the equipment.

[0023] Further, in the compression cycle system provided by the application, since the compressor is provided as described above, the various advantages as described above are also provided. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 is a partial cross-sectional schematic view of the compressor provided by the application;

[0026] Figure 2 is one of the structural schematic views of the compressor provided by the application;

[0027] Figure 3 is the second structural schematic view of the compressor provided by the application;

[0028] Figure 4 is one of the schematic diagrams of the refrigeration cycle system provided by the present application;

[0029] Figure 5 is one of the schematic diagrams of the refrigeration cycle system provided by the present application;

[0030] Figure 6 is one of the schematic diagrams of the refrigeration cycle system provided by the present application;

[0031] Figure 7 is one of the schematic diagrams of the refrigeration cycle system provided by the present application.

[0032] Reference signs:

[0033] 100: first cylinder; 110: second cylinder; 120: piston;

[0034] 130: inner cavity; 101: porous bearing sleeve; 102: liquid supplement port;

[0035] 103: annular liquid inlet; 140: suction valve; 150: exhaust mechanism;

[0036] 141: suction passage; 151: mounting seat; 152: back pressure cavity;

[0037] 153: exhaust valve; 154: spring; 121: first end face;

[0038] 200: driving mechanism; 201: shell; 202: coupling;

[0039] 210: compressor; 211: exhaust port; 212: suction port;

[0040] 300: first heat exchanger; 301: first main path; 302: first branch path;

[0041] 310: first four-way valve; 320: second four-way valve; 400: second heat exchanger;

[0042] 410: fourth heat exchanger; 500: throttling element; 510: first electromagnetic reversing valve;

[0043] 401: secondary branch path; 402: primary main path; 530: second electromagnetic reversing valve;

[0044] 520: third heat exchanger; 540: third electromagnetic reversing valve; 550: fourth electromagnetic reversing valve. DETAILED DESCRIPTION

[0045] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings for the purpose of making the technical solutions in the present application clearer, complete and more comprehensible. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those of ordinary skill in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0049] The following will be combined Figures 1 to 7 The embodiments of the present application are described. It should be understood that the following description is only a schematic embodiment of the present application and does not constitute a limitation on the present application.

[0050] As Figure 1As shown, the present application provides a compressor, comprising: a first cylinder body 100, a second cylinder body 110 and a piston 120, the first cylinder body 100 and the second cylinder body 110 are nested to form an inner cavity 130, and the piston 120 reciprocates in the inner cavity 130.

[0051] Wherein, an annular groove is formed between the first cylinder body 100 and the second cylinder body 110, and a porous bearing sleeve 101 is installed in the annular groove, and the porous bearing sleeve 101 is part of the sidewall of the inner cavity 130; the first cylinder body 100 is provided with a through hole to form a liquid supplement port 102, and the porous bearing sleeve 101 is in communication with one end of the liquid supplement port 102.

[0052] In other words, the first cylinder body 100 and the second cylinder body 110 are nested to form a cylinder, and the inner part of the cylinder forms an inner cavity 130. The first cylinder body 100, the porous bearing sleeve 101 and the second cylinder body 110 are nested in turn to form the inner cavity 130.

[0053] As shown, Figure 1 In an embodiment of the present application, an annular liquid inlet channel 103 is formed on the first cylinder body 100, the annular liquid inlet channel 103 is in annular communication with the annular groove, and the liquid supplement port 102 communicates with the porous bearing sleeve 101 through the annular liquid inlet channel 103.

[0054] In other words, the annular liquid inlet channel 103 is formed between the porous bearing sleeve 101 and the first cylinder body 100, and the gas and / or liquid entering the liquid supplement port 102 is evenly distributed on the porous bearing sleeve 101 through the annular liquid inlet channel 103 and enters the inner cavity.

[0055] Further, the annular liquid inlet channel 103 has a taper, which transitions from the smaller diameter of the liquid supplement port 102 to the larger width of the porous bearing sleeve 101, reducing the liquid pressure loss. Moreover, the width of the surface of the annular liquid inlet channel 103 in contact with the porous bearing sleeve 101 is smaller than the width of the porous bearing sleeve 101. Preventing the first cylinder body 100 and the second cylinder body 110 from limiting the position of the porous bearing sleeve 101 due to the excessive force bearing surface of the porous bearing sleeve 101.

[0056] For the porous bearing sleeve 101 of the present application, the porous bearing sleeve 101 is a single-diameter ring, and the inside of the porous bearing sleeve 101 is provided with gas-permeable channels with a pore size of 0.001 microns to 1000 microns. The porous bearing sleeve 101 can be a gas-permeable porous foam structure processed from one or more of metal powder, metal wire mesh and non-metal powder; or a porous gas-permeable ceramic structure or a porous gas-permeable plastic structure processed from non-metallic powders such as carbon powder, graphite powder, aluminum oxide powder, silicon dioxide powder, engineering plastic powder, etc.

[0057] In the embodiment of the present application, the compressor comprises a suction valve 140 arranged at the front end of the piston and an exhaust mechanism 150 arranged at the front end of the second cylinder 110. The surface of the exhaust mechanism 150 in contact with the second cylinder 110 is the top dead center of the piston 120. The point farthest from the top dead center during the return stroke of the piston 120 is the bottom dead center. The piston 120 moves linearly between the top dead center and the bottom dead center.

[0058] In addition, the piston 120 is provided with a suction passage 141. When the suction valve 140 is opened, the suction passage 141 connects the suction valve 140 and the inner cavity 130.

[0059] Continuing to refer to Figure 1 In an alternative embodiment of the present application, the exhaust mechanism 150 comprises a mounting seat 151, a back pressure cavity 152 formed in the mounting seat 151, an exhaust valve 153 in the back pressure cavity 152, and an exhaust port 211. A spring 154 is arranged between the exhaust valve 153 and the mounting seat 151. The back pressure cavity 152 is in communication with the exhaust port 211. The exhaust valve 153 is in contact with the end surface of the second cylinder 110 to form the top dead center of the piston 120.

[0060] With respect to the movement of the piston 120, the initial position of the piston 120 is at the top dead center. In the first stage, when the front end surface of the piston 120 moves from the top dead center to the first end surface 121, which is the end surface of the porous bearing sleeve 101 close to the top dead center, the piston 120 forms a compression cavity with the exhaust mechanism 150. The compression cavity is a part of the inner cavity 130 between the piston 120 and the exhaust valve 153.

[0061] When the pressure in the compression cavity is lower than the pressure in the suction passage 141, the suction valve 140 opens under the action of the pressure difference, realizing low-pressure suction. At this time, the refrigerant flowing out of the porous bearing sleeve 101 enters the gap between the piston 120 and the inner cavity side wall. The refrigerant flowing out of the porous bearing sleeve 101 has the effect of lubrication and cooling on the piston 120. Part of the refrigerant throttled through the gap between the piston 120 and the inner cavity side wall enters the compression cavity, and the other part enters the body part, which is the cavity on the side of the piston rod and the shell part in communication with it.

[0062] In the second stage, when the front end surface of the piston 120 continues to move from the first end surface 121 to the bottom dead center, the porous bearing sleeve 101 starts to communicate with the compression cavity, and a large amount of refrigerant enters the compression cavity, realizing medium-pressure liquid supplementing through the liquid supplementing port 102.

[0063] Furthermore, during this process, if the pressure in the compression chamber is higher than the pressure in the intake passage 141, the intake valve 140 is closed. If the medium-pressure fluid replenishment volume of the fluid replenishment port 102 is small, the pressure in the compression chamber rises slowly with the fluid replenishment port 102, resulting in the pressure in the compression chamber still being lower than the pressure in the intake passage 141, the intake valve 140 remains open, allowing the fluid replenishment port 102 and the intake passage 141 to simultaneously supply refrigerant.

[0064] The third stage: When the piston 120 reaches the bottom dead center and moves from the bottom dead center to the top dead center, the intake valve 140 is closed, and the fluid replenishment port 102 continues to replenish fluid through the porous bearing sleeve 101 until the front end face of the piston 120 reaches the first end face 121 of the porous bearing sleeve 101 or the refrigerant pressure in the compression chamber is higher than the pressure in the fluid replenishment port 102.

[0065] Fourth stage: When the front end face of the piston 120 moves from the first end face 121 to the top dead center, when the pressure in the cavity reaches the exhaust pressure, the exhaust valve 153 opens, and the high-pressure refrigerant is discharged to the exhaust port 211, completing expansion, suction, compression and exhaust.

[0066] like Figure 2 As shown, in an optional embodiment of the present invention, it includes a driving mechanism 200 and a housing 201 . The driving mechanism 200 drives the piston 120 to reciprocate in the inner cavity 130 through a coupling 202 , and the compressor is placed in the housing 201 .

[0067] like Figure 3 As shown, another optional embodiment of the present invention includes a pair of compressors 210, each driven by a pair of drive mechanisms 200. The pair of compressors 210 are housed within a common housing 201, with the drive mechanisms 200 of the compressors 210 arranged in opposite directions. Furthermore, the pair of compressors 210 share a common exhaust port and an air intake port. Arranging the drive mechanisms 200 of the compressors in opposite directions effectively reduces vibration of the compressor 210.

[0068] In summary, the piston 120 is driven by the driving mechanism 200 to reciprocate in the inner cavity, and cooperates with the intake valve, exhaust mechanism and liquid filling port to realize the suction, compression, filling, discharge and expansion process of the refrigerant in the compression chamber.

[0069] like Figures 4 to 7 As shown, the present invention also provides a compression cycle system, including a first heat exchanger 300, a second heat exchanger 400 and the above-mentioned compressor 210, the first heat exchanger 300, the second heat exchanger 400 and the compressor 210 forming a circulation loop with a liquid replenishing branch.

[0070] like Figure 4As shown, in one embodiment of the present invention, the exhaust port 211 of the compressor 210 is connected to the first heat exchanger 300, the first heat exchanger 300 includes a first main path 301 and a first branch path 302, the first main path 301 is connected to the second heat exchanger 400, the first branch path 302 is connected to the fluid replenishment port 102 of the compressor 210, and the second heat exchanger 400 is connected to the intake port 212 of the compressor 210.

[0071] The compression cycle of this embodiment can achieve a single-room refrigeration effect. In this embodiment, the first heat exchanger 300 is a condenser, and the second heat exchanger 400 is an evaporator.

[0072] In other words, a diversion node is provided at the outlet of the first heat exchanger 300, where the condensed refrigerant is split into two paths: one path is the first main path 301. After passing through the main path throttling element 500, the refrigerant in the first main path 301 is connected to the second heat exchanger 400. The outlet of the second heat exchanger 400 is connected to the intake port 212 of the compressor 210. The other path is the first branch path 302, which is the liquid replenishment branch. The condensed refrigerant is directly connected to the gas replenishment port 102 via a three-way valve.

[0073] The intersection of the first main path 301 and the first branch path 302 is the flow branching node. The direct fluid replenishment of the first branch path 302 achieves lubrication, sealing, and cooling effects during the compression process.

[0074] like Figure 5 As shown, in another embodiment of the present invention, the compression cycle system further includes a first four-way valve 310 and a first electromagnetic reversing valve 510. The four interfaces of the first four-way valve 310 are respectively connected to the exhaust port 211, the first heat exchanger 300, the intake port 212 and the second heat exchanger 400. The inlet of the first electromagnetic reversing valve 510 is respectively connected to the first branch 302 and the second heat exchanger 400. The outlet of the first electromagnetic reversing valve 510 is connected to the fluid replenishing port 102. The valve ports of the first four-way valve 310 and the first electromagnetic reversing valve 510 are switched to realize the switching between the cooling state and the heating state.

[0075] In the cooling mode, the first heat exchanger 300 functions as a condenser, and the second heat exchanger 400 functions as an evaporator. The exhaust port 211 is connected to the first heat exchanger 300, the intake port 212 is connected to the second heat exchanger 400, and the first branch 302 is connected to the refill port 102. In the heating mode, the first heat exchanger 300 functions as an evaporator, and the second heat exchanger 400 functions as a condenser. The exhaust port 211 is connected to the second heat exchanger 400, the intake port 212 is connected to the first heat exchanger 300, and the primary branch 401 of the second heat exchanger 400 is connected to the refill port 102. The compression cycle system of this embodiment can achieve dual-mode cooling and heating for a single room.

[0076] In other words, the first four-way valve 310 includes a first port, a second port, a third port, and a fourth port, and the first electromagnetic reversing valve 510 includes a first inlet, a second inlet, and a first outlet.

[0077] Specifically, the first interface is connected to the compressor exhaust port 211, the second interface is connected to the first heat exchanger 300, the third interface is connected to the compressor intake port 212, and the fourth interface is connected to the second heat exchanger 400. The first main path 301 of the first heat exchanger 300 is connected to the primary main path 402 of the second heat exchanger 400, the first branch path 302 is connected to the first inlet, the second inlet is connected to the primary branch path 401 of the second heat exchanger 400, and the first outlet is connected to the fluid infusion port.

[0078] In the cooling state, the first interface is connected to the second interface, the third interface is connected to the fourth interface, and the first branch 302 is connected to the first inlet. Figure 5 The black solid arrows in the middle indicate the path where the refrigerant flows from the exhaust port 211 to the four-way valve 310, then to the first heat exchanger 300. After passing through the diversion node, one path of the refrigerant passes through the first main path 301, the throttling element 500, and the second heat exchanger 400, before returning to the intake port 212. The other path passes through the first electromagnetic reversing valve 510 and reaches the liquid replenishment port 102.

[0079] In the heating state, the first interface is connected to the fourth interface, the second interface is connected to the third interface, and the second inlet is connected to the second heat exchanger 400. Figure 5 The dotted hollow arrows indicate the path where the refrigerant flows from the exhaust port 211 through the first four-way valve 310, and then through the second heat exchanger 400. The second heat exchanger 400 passes through the diversion node. One path passes through the primary main path 402, the throttling element 500, and the first heat exchanger 300 in sequence and returns to the intake port 212. The other path passes through the primary branch 401 to reach the first electromagnetic reversing valve 510 and finally flows to the liquid replenishing port 102.

[0080] like Figure 6 As shown, in another embodiment of the present invention, the compression cycle system also includes a second four-way valve 320 and a third heat exchanger 520. The third heat exchanger 520 includes a first heat exchange side and a second heat exchange side. The four interfaces of the second four-way valve 320 are respectively connected to the suction port 212 and the exhaust port 211 of the compressor, the first heat exchanger 300, and the second heat exchanger 400.

[0081] Specifically, one end of the first heat exchange side is connected to the first heat exchanger 300, and the other end is connected to the primary main path 402 of the second heat exchanger 400; one end of the second heat exchange side is connected to the secondary branch 401 of the second heat exchanger 400, and the other end is connected to the fluid replenishment port 102. The valve port switching of the second four-way valve 320 realizes the switching between the cooling state and the heating state.

[0082] In the cooling state, the first heat exchanger 300 acts as a condenser and the second heat exchanger 400 acts as an evaporator. Figure 6 The path indicated by the black solid arrow in the middle shows that the refrigerant is discharged from the exhaust port 211, passes through the second four-way reversing valve 320, enters the first heat exchanger 300, the first heat exchange side, and the second heat exchanger 400 in sequence, and then returns to the intake port 212 through the second four-way valve 320. In this refrigeration cycle, the first heat exchange side does not exchange heat and only serves as a pipeline.

[0083] In the heating state, the first heat exchanger 300 acts as an evaporator, the second heat exchanger 400 acts as a condenser, and the third heat exchanger 520 acts as an evaporator. Figure 6 The path indicated by the hollow dashed arrows is that the refrigerant is discharged from the exhaust port 211, passes through the second four-way reversing valve 320, and enters the second heat exchanger 400. The second heat exchanger 400 then passes through the diversion node, and one path passes through the primary main path 402, the first heat exchange side, the throttling element 500, the first heat exchanger 300, the second four-way reversing valve 320, and finally flows back to the intake port. The other path passes through the primary branch path 401, the throttling element, the second heat exchange side, and finally flows back to the liquid inlet 102.

[0084] The evaporating temperature of the circuit in which primary main circuit 402 resides is relatively low. The provision of third heat exchanger 520 increases the degree of subcooling in the circuit in which primary main circuit 402 resides before throttling, thereby increasing the enthalpy difference of second heat exchanger 400. Simultaneously, by utilizing the relatively high evaporating pressure of primary branch circuit 401, some refrigerant from the circuit in which primary branch 401 resides is fed into the compressor, increasing the total refrigerant flow rate during heating, thereby improving the heating capacity and performance of the system, particularly in low-temperature environments.

[0085] like Figure 7 As shown, in an optional embodiment of the present invention, the compression cycle system further includes a fourth heat exchanger 410, a second electromagnetic reversing valve 530, a third electromagnetic reversing valve 540 and a fourth electromagnetic reversing valve 550. The outlet of the second heat exchanger 400 is connected to the air intake port 212 of the compressor, and the inlet of the first heat exchanger 300 is connected to the air exhaust port 211 of the compressor.

[0086] Furthermore, the second electromagnetic reversing valve 530 is respectively connected to the outlet of the first heat exchanger 300, the inlet of the fourth heat exchanger 410 and the fourth electromagnetic reversing valve 550, the third electromagnetic reversing valve 540 is respectively connected to the outlet of the fourth heat exchanger 410, the inlet of the second heat exchanger 400 and the fourth electromagnetic reversing valve 550, and the fourth electromagnetic reversing valve 550 is connected to the fluid infusion port 102.

[0087] This embodiment is a dual-chamber refrigeration system, the first heat exchanger 300 is used as a condenser, the second heat exchanger 400 is used as an evaporator, and the fourth heat exchanger 410 is used as an evaporator.Figure 7 The path indicated by the middle black solid arrow, the refrigerant discharged from the compressor discharge port 211 passes through the first heat exchanger 300, the second electromagnetic switching valve 530, the throttling element 500, the fourth heat exchanger 410, the third electromagnetic switching valve 540, the second heat exchanger 400 in sequence, and finally returns to the suction port 212 of the compressor.

[0088] In addition, the middle-temperature single-chamber refrigeration state is Figure 7 The path indicated by the middle solid line hollow arrow, the refrigerant discharged from the discharge port 211 passes through the first heat exchanger 300, the second electromagnetic switching valve 530, the throttling element 500, the fourth heat exchanger 410, the third electromagnetic switching valve 540, the fourth electromagnetic switching valve 550 in sequence, and finally returns to the compressor liquid supplement port 102. The refrigeration function of the refrigeration chamber alone can be realized.

[0089] In addition, the low-temperature single-chamber refrigeration state is Figure 7 The path indicated by the middle dashed line hollow arrow, the refrigerant discharged from the discharge port 211 passes through the first heat exchanger 300, the second electromagnetic switching valve 530, the fourth electromagnetic switching valve 550, the third electromagnetic switching valve 540, the second heat exchanger 400 in sequence, and finally returns to the suction port 212. The refrigeration function of the refrigeration chamber alone can be realized.

[0090] In this embodiment of the present application, since the compressor is provided with a liquid supplement port 102, compared with the existing compressor provided with only one suction port, the double-chamber simultaneous refrigeration or single-chamber refrigeration can be realized, and the liquid supplement port 102 can be fully utilized to better utilize energy and avoid energy waste.

[0091] The compressor provided by the present application realizes the effects of lubrication, liquid supplement, sealing and cooling of the compressor by the liquid entering through the liquid supplement port, reduces the friction and leakage of the compressor, reduces the temperature in the compression chamber, thereby reducing energy consumption and equipment size, and realizes oil-free operation of the compressor.

[0092] Further, in the compression cycle system provided by the present application, since the compressor provided has the advantages as described above, the compression cycle system also has the advantages as described above.

[0093] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A compression cycle system, characterized in that: include: A first heat exchanger, a second heat exchanger, a second four-way valve, a third heat exchanger and a compressor, wherein the first heat exchanger, the second heat exchanger and the compressor form a circulation loop with a liquid replenishing branch; The compressor includes: a first cylinder body, a second cylinder body and a piston. The first cylinder body and the second cylinder body are sleeved together to form an inner cavity. The piston reciprocates in the inner cavity. An annular groove is formed between the first cylinder body and the second cylinder body, and a porous bearing sleeve is installed in the annular groove, and the porous bearing sleeve is part of the side wall of the inner cavity; the first cylinder body is provided with a through hole to form a fluid infusion port, and the porous bearing sleeve is connected to one end of the fluid infusion port; The third heat exchanger includes a first heat exchange side and a second heat exchange side. The four interfaces of the second four-way valve are respectively connected to the exhaust port and the intake port of the compressor, the first heat exchanger, and the second heat exchanger. One end of the first heat exchange side is connected to the first heat exchanger, and the other end is connected to the primary main line of the second heat exchanger. One end of the second heat exchange side is connected to the secondary branch of the second heat exchanger, and the other end is connected to the fluid replenishment port. The valve port of the second four-way valve is switched to realize the switching between the cooling state and the heating state.

2. The compression cycle system according to claim 1, characterized in that: The first cylinder body is provided with an annular liquid inlet channel, and the annular liquid inlet channel is in annular communication with the annular groove. The fluid replenishing port is communicated with the porous bearing sleeve through the annular fluid inlet channel.

3. The compression cycle system according to claim 1, characterized in that: It includes an air intake valve arranged at the front end of the piston and an exhaust mechanism arranged at the front end of the second cylinder body.

4. The compression cycle system according to claim 1, characterized in that: It comprises a driving mechanism and a shell. The driving mechanism drives the piston to perform reciprocating motion in the inner cavity through a coupling. The compressor is placed in the shell.

5. The compression cycle system according to claim 4, characterized in that: The compressor comprises a pair of the compressors, the pair of the compressors are driven by a pair of the driving mechanisms, and the pair of the compressors are placed in the same housing. Wherein, the driving mechanisms of a pair of compressors are arranged in opposite directions.

6. A compression cycle system, characterized in that: include: A first heat exchanger, a second heat exchanger, a fourth heat exchanger, a second electromagnetic reversing valve, a third electromagnetic reversing valve, a fourth electromagnetic reversing valve and a compressor, wherein the first heat exchanger, the second heat exchanger and the compressor form a circulation loop with a liquid infusion branch; The compressor includes: a first cylinder body, a second cylinder body and a piston. The first cylinder body and the second cylinder body are sleeved together to form an inner cavity. The piston reciprocates in the inner cavity. An annular groove is formed between the first cylinder body and the second cylinder body, and a porous bearing sleeve is installed in the annular groove, and the porous bearing sleeve is part of the side wall of the inner cavity; the first cylinder body is provided with a through hole to form a fluid infusion port, and the porous bearing sleeve is connected to one end of the fluid infusion port; The outlet of the second heat exchanger is connected to the air intake of the compressor, and the inlet of the first heat exchanger is connected to the air discharge port of the compressor. The second electromagnetic reversing valve is respectively connected to the outlet of the first heat exchanger, the inlet of the fourth heat exchanger and the fourth electromagnetic reversing valve, the third electromagnetic reversing valve is respectively connected to the outlet of the fourth heat exchanger, the inlet of the second heat exchanger and the fourth electromagnetic reversing valve, and the fourth electromagnetic reversing valve is connected to the fluid infusion port.

7. The compression cycle system according to claim 6, characterized in that: The first cylinder body is provided with an annular liquid inlet channel, and the annular liquid inlet channel is in annular communication with the annular groove. The fluid replenishing port is communicated with the porous bearing sleeve through the annular fluid inlet channel.

8. The compression cycle system according to claim 6, characterized in that: It includes an air intake valve arranged at the front end of the piston and an exhaust mechanism arranged at the front end of the second cylinder body.

9. The compression cycle system according to claim 6, characterized in that: It comprises a driving mechanism and a shell. The driving mechanism drives the piston to perform reciprocating motion in the inner cavity through a coupling. The compressor is placed in the shell.

10. The compression cycle system according to claim 9, characterized in that: The compressor comprises a pair of the compressors, the pair of the compressors are driven by a pair of the driving mechanisms, and the pair of the compressors are placed in the same housing. Wherein, the driving mechanisms of a pair of compressors are arranged in opposite directions.

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