Compression device and heat exchange system

Abstract

The application discloses a compression device and a heat exchange system. The compression device comprises a compressor, a liquid storage mechanism and an oil separation mechanism. The compressor comprises a casing, a first compression cylinder and a second compression cylinder. The casing has a containing cavity, a first exhaust port and a second exhaust port. The liquid storage mechanism has a first liquid storage cavity and a second liquid storage cavity. The outlet of the first liquid storage cavity is communicated with the inlet of the first compression cylinder. A section of flow path from the inlet of the first liquid storage cavity to the inlet of the first compression cylinder is an oil return section. The outlet of the second liquid storage cavity is communicated with the inlet of the second compression cylinder. The outlet of the second compression cylinder is communicated with the second exhaust port. The oil separation mechanism comprises an oil-gas separator and a switching device. The oil-gas separator has an oil-gas inlet, an oil outlet and an air outlet. The oil-gas inlet is communicated with the second exhaust port. The oil outlet is communicated with the containing cavity and the oil return section through the switching device. The switching device is used for controlling the oil returned from the oil-gas separator to flow to the containing cavity and / or the oil return section.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a compression device and a heat exchange system. Background Technology

[0002] In existing heat exchange systems, such as air conditioning systems, the compressor has poor oil return capability, especially in dual-suction and dual-exhaust compressors. A large amount of lubricating oil is discharged directly from the exhaust port of one of the cylinders along the pipeline to the outside of the compressor. This results in a high oil output rate and poor oil return capability of the compressor, which can lead to damage due to lack of oil. Summary of the Invention

[0003] The main objective of this invention is to provide a compression device that addresses the problem of poor oil return capacity in existing heat exchange systems.

[0004] To achieve the above objectives, the present invention provides a compression device, the compression device comprising:

[0005] A compressor includes a housing, a first compression cylinder, and a second compression cylinder. The housing has a receiving cavity, a first exhaust port, and a second exhaust port. The first compression cylinder and the second compression cylinder are disposed within the receiving cavity.

[0006] The liquid storage mechanism has a first liquid storage chamber and a second liquid storage chamber. The outlet of the first liquid storage chamber is connected to the inlet of the first compression cylinder. The flow path from the inlet of the first liquid storage chamber to the inlet of the first compression cylinder is a return oil section. The outlet of the first compression cylinder is connected to the first exhaust port through the receiving chamber. The outlet of the second liquid storage chamber is connected to the inlet of the second compression cylinder. The outlet of the second compression cylinder is connected to the second exhaust port.

[0007] The oil separation mechanism includes an oil-gas separator and a switching device. The oil-gas separator is located outside the housing and has an oil-gas inlet, an oil outlet, and a gas outlet. The oil-gas inlet is connected to the second exhaust port, and the oil outlet is connected to the receiving cavity and the oil return section via the switching device. The switching device is used to control the oil discharged from the oil-gas separator to flow back to the receiving cavity and / or the oil return section.

[0008] In one embodiment, the switching device includes a switching component, a return oil connection pipe, a first return oil pipe, and a second return oil pipe. The switching component has a first interface, a second interface, and a third interface that are interconnected. The first interface is connected to the receiving cavity via the first return oil pipe, the second interface is connected to the return oil section via the second return oil pipe, and the third interface is connected to the oil outlet via the return oil connection pipe. The switching component is used to control the connection and disconnection between the oil outlet and the receiving cavity and / or the return oil section.

[0009] In one embodiment, the liquid storage mechanism includes a liquid storage body and a first liquid storage connecting pipe. The liquid storage body has a first liquid storage chamber. The outlet of the first liquid storage chamber is connected to the inlet of the first compression cylinder via the first liquid storage connecting pipe. The second oil return pipe is connected to at least one of the inlet of the first liquid storage chamber, the interior of the first liquid storage chamber, the outlet of the first liquid storage chamber, the first liquid storage connecting pipe, and the inlet of the first compression cylinder.

[0010] In one embodiment, the switching assembly includes a pipe joint, a first valve body, and a second valve body. The pipe joint has a first interface, a second interface, and a third interface. The first valve body is disposed on the first return oil pipe, and the second valve body is disposed on the second return oil pipe.

[0011] In one embodiment, the first valve body is a solenoid valve or a throttle valve;

[0012] And / or, the second valve body is a solenoid valve or a throttle valve.

[0013] In one embodiment, the first valve body is a one-way valve, which is configured to allow unidirectional flow from the first interface to the receiving cavity.

[0014] In one embodiment, the switching assembly includes a switching valve having a first interface, a second interface, and a third interface, the switching valve being used to control the flow of oil flowing into the return oil connection pipe along the first return oil pipe and / or the second return oil pipe.

[0015] In one embodiment, the switching valve is a three-way valve, the first port of the three-way valve is connected to the first return oil pipe, the second port of the three-way valve is connected to the second return oil pipe, and the third port of the three-way valve is connected to the return oil connection pipe.

[0016] In one embodiment, the liquid storage mechanism includes a first liquid reservoir, a second liquid reservoir, a first liquid storage connecting pipe, and a second liquid storage connecting pipe. The first liquid reservoir has a first liquid storage chamber and is connected to the inlet of the first compression cylinder via the first liquid storage connecting pipe. The second liquid reservoir has a second liquid storage chamber and is connected to the inlet of the second compression cylinder via the second liquid storage connecting pipe.

[0017] And / or, the compressor is a double-suction, double-row compressor.

[0018] The present invention also proposes a heat exchange system, which includes the compression device described above.

[0019] In one embodiment, the heat exchange system further includes a detection component and a control device, the control device being electrically connected to the detection component and the switching device respectively; the detection component is used to detect the operating parameters of the compressor, the operating parameters of the compressor including at least one of suction pressure, suction temperature, discharge pressure and discharge temperature;

[0020] The control device is used to control the compressor to enter a first working mode when the operating parameters of the compressor exceed the preset parameter range.

[0021] In the first working mode, the control device controls the switching device to disconnect the oil outlet from the receiving cavity, and also controls the switching device to connect the oil outlet to the return section, so that the oil discharged from the oil-gas separator can flow back to the return section.

[0022] In one embodiment, the control device is further configured to control the compression device to enter a second operating mode when the operating parameters of the compressor are within a preset parameter range and the exhaust pressure at the outlet of the second compression cylinder is less than or equal to the exhaust pressure at the outlet of the first compression cylinder.

[0023] In the second working mode, the control device controls the switching device to disconnect the oil outlet from the receiving cavity, and also controls the switching device to connect the oil outlet to the return section, so that the oil discharged from the oil-gas separator can flow back to the return section.

[0024] In one embodiment, the control device is further configured to control the compression device to enter a third operating mode when the operating parameters of the compressor are within a preset parameter range and the exhaust pressure at the outlet of the second compression cylinder is greater than the exhaust pressure at the outlet of the first compression cylinder.

[0025] In the third operating mode, the control device controls the switching device to disconnect the oil outlet from the oil return section, and also controls the switching device to connect the oil outlet to the receiving cavity, so that the oil discharged from the oil-gas separator can flow back to the receiving cavity.

[0026] In the technical solution of this invention, the compression device includes a compressor, a liquid storage mechanism, and an oil separation mechanism. The oil separation mechanism includes an oil-gas separator and a switching device. The oil-gas separator is located outside the casing and has an oil-gas inlet, an oil outlet, and a gas outlet. The oil-gas inlet is connected to a second exhaust port. The oil outlet is connected to a receiving cavity and a return oil section via the switching device. The switching device is used to control the oil discharged from the oil-gas separator to flow back to the receiving cavity and / or the return oil section. This configuration means that the oil outlet of the oil-gas separator is connected to the receiving cavity via the switching device to form one return oil flow path, and the oil outlet of the oil-gas separator is connected to the return oil section via the switching device to form another return oil flow path. The two return oil flow paths are controlled by the switching device so that the oil discharged from the oil outlet of the oil-gas separator can flow back to the receiving cavity of the casing and / or the inlet of the first compression cylinder. The compression device can select different return oil flow paths according to different operating conditions, which not only improves the oil return capacity of the compressor but also improves the energy efficiency of the compressor.

[0027] For example, when the compressor's operating parameters exceed the preset range, the compressor's operating condition becomes unstable. In this case, the discharge pressure at the outlet of the first compression cylinder may be greater than the discharge pressure at the outlet of the second compression cylinder. The lubricating oil discharged from the second compression cylinder cannot flow back smoothly into the receiving cavity. In this situation, the lubricating oil discharged from the second compression cylinder can be controlled to flow back to the lower pressure return section by a switching device. That is, by utilizing the pressure difference between the high pressure of the oil-gas separator and the low pressure at the inlet of the first compression cylinder, the lubricating oil can flow back smoothly into the first compression cylinder, thereby realizing the function of smooth oil return of the compressor.

[0028] When the compressor's operating parameters are within the preset range, and the discharge pressure at the outlet of the second compression cylinder is less than or equal to the discharge pressure at the outlet of the first compression cylinder, the compressor's operating condition is stable. However, the lubricating oil discharged from the second compression cylinder cannot flow back smoothly into the receiving cavity. In this case, the lubricating oil discharged from the second compression cylinder can be controlled to flow back to the lower pressure return oil section by a switching device. That is, by utilizing the pressure difference between the high pressure of the oil-gas separator and the low pressure at the inlet of the first compression cylinder, the lubricating oil can flow back smoothly into the first compression cylinder, thereby achieving the function of smooth oil return of the compressor.

[0029] When the compressor's operating parameters are within the preset range, and the discharge pressure at the outlet of the second compression cylinder is greater than that at the outlet of the first compression cylinder, the compressor's operation is stable. However, if the discharge temperature of the second compression cylinder and the temperature of the discharged lubricating oil are too high, and the lubricating oil with excessively high temperature flows back into the first liquid storage chamber, it will heat the refrigerant in the first liquid storage chamber. This will cause the inlet temperature of the first compression cylinder to be too high. High-temperature inlet air will reduce the compressor's efficiency and increase energy consumption. In this case, the excessively hot lubricating oil can be directly returned to the storage chamber by a switching device. This ensures the return of oil to the compressor and also improves the compressor's energy efficiency.

[0030] Therefore, in the technical solution of this application, the compression device can control the oil discharged from the oil-gas separator to flow back to the receiving cavity and / or the oil return section through the switching device. The compression device can select different oil return paths according to different working conditions, which not only improves the oil return capacity of the compressor, but also improves the energy efficiency of the compressor. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the first embodiment of the compression device provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of a second embodiment of the compression device provided by the present invention;

[0034] Figure 3 This is a schematic diagram of the third embodiment of the compression device provided by the present invention;

[0035] Figure 4 This is a schematic diagram of the fourth embodiment of the compression device provided by the present invention.

[0036] Explanation of icon numbers:

[0037] 10. Compression device;

[0038] 100. Compressor; 110. Housing; 111. Receiving cavity; 112. First exhaust port; 113. Second exhaust port; 120. First compression cylinder; 121. Inlet of the first compression cylinder; 122. Outlet of the first compression cylinder; 123. First muffler; 124. First cylinder; 130. Second compression cylinder; 131. Inlet of the second compression cylinder; 132. Outlet of the second compression cylinder; 133. Second muffler; 134. Second cylinder; 140. Motor assembly; 150. Crankshaft;

[0039] 200. Liquid storage mechanism; 210. First liquid reservoir; 211. First liquid storage chamber; 212. Inlet of the first liquid storage chamber; 213. Outlet of the first liquid storage chamber; 220. Second liquid reservoir; 221. Second liquid storage chamber; 222. Outlet of the second liquid storage chamber; 230. Oil return section; 240. First liquid storage connecting pipe; 250. Second liquid storage connecting pipe;

[0040] 300. Oil separation mechanism; 310. Oil-gas separator; 311. Oil-gas inlet; 312. Oil outlet; 313. Gas outlet; 320. Switching device; 321. Switching assembly; 3211. Pipe joint; 3212. First valve body; 3213. Second valve body; 3214. Switching valve; 322. Return oil connection pipe; 323. First return oil pipe; 324. Second return oil pipe.

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0044] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0045] In existing heat exchange systems, such as air conditioning systems, the compressor has poor oil return capability, especially in dual-suction and dual-exhaust compressors. A large amount of lubricating oil is discharged directly from the exhaust port of one of the cylinders along the pipeline to the outside of the compressor. This results in a high oil output rate and poor oil return capability of the compressor, which can lead to damage due to lack of oil.

[0046] Based on this, this application proposes a compression device and a heat exchange system including the compression device, which can solve the problem of poor oil return capacity of existing compressors.

[0047] Please see Figure 1 In one embodiment of this application, the compressor 100 includes a housing 110, a first compression cylinder 120, and a second compression cylinder 130. The housing 110 has a receiving cavity 111, a first exhaust port 112, and a second exhaust port 113. The first compression cylinder 120 and the second compression cylinder 130 are disposed within the receiving cavity 111. The liquid storage mechanism 200 has a first liquid storage chamber 211 and a second liquid storage chamber 221. The outlet 213 of the first liquid storage chamber is connected to the inlet 121 of the first compression cylinder. A flow path from the inlet 212 of the first liquid storage chamber to the inlet 121 of the first compression cylinder is a return oil section 230. The outlet 122 of the first compression cylinder is connected to the first exhaust port 112 via the receiving cavity 111. The outlet 222 of the second liquid storage chamber is connected to the inlet 131 of the second compression cylinder, and the outlet 132 of the second compression cylinder is connected to the second exhaust port 113. The oil separation mechanism 300 includes an oil-gas separator 310 and a switching device 320. The oil-gas separator 310 is located outside the housing 110. The oil-gas separator 310 has an oil-gas inlet 311, an oil outlet 312 and a gas outlet 313. The oil-gas inlet 311 is connected to the second exhaust port 113. The oil outlet 312 is connected to the receiving chamber 111 and the return oil section 230 respectively via the switching device 320. The switching device 320 is used to control the oil discharged from the oil-gas separator 310 to flow back to the receiving chamber 111 and / or the return oil section 230.

[0048] It is understood that compressor 100 can be a rotary compressor, or other types of compressors, which are not limited here. In this solution, compressor 100 is a rolling rotary compressor. Compressor 100 includes a casing 110, which has a return port and an exhaust port. The return port is used for refrigerant to flow in, and the exhaust port is used for refrigerant to flow out. The number of return ports and exhaust ports can be two or more, and their specific positions on the casing 110 are not limited. Specifically, in this solution, casing 110 has a first return port, a second return port, a first exhaust port 112, and a second exhaust port 113. The first and second return ports are located on the outer peripheral wall of casing 110 near the bottom end, the first exhaust port 112 is located at the top end of casing 110, and the second exhaust port 113 is located on the outer peripheral wall of casing 110 near the bottom end.

[0049] Furthermore, the liquid storage mechanism 200 has a first liquid storage chamber 211 and a second liquid storage chamber 221. The first liquid storage chamber 211 and the second liquid storage chamber 221 can be located in the same liquid storage container or in different liquid storage containers. That is, a liquid storage container can have both a first liquid storage chamber 211 and a second liquid storage chamber 221 at the same time; or, a liquid storage container can have a first liquid storage chamber 211 and another liquid storage container can have a second liquid storage chamber 221. The specific configuration can be made according to the needs.

[0050] Furthermore, the first compression cylinder 120 and the second compression cylinder 130 are disposed in the receiving cavity 111. The outlet 213 of the first liquid storage cavity is connected to the inlet 121 of the first compression cylinder. The first compression cylinder 120 is used to compress the refrigerant flowing into the first liquid storage cavity 211 to the required pressure and then discharge it from the first exhaust port 112. The outlet 222 of the second liquid storage cavity is connected to the inlet 131 of the second compression cylinder. The second compression cylinder 130 is used to compress the refrigerant flowing into the second liquid storage cavity 221 to the required pressure and then discharge it from the second exhaust port 113.

[0051] The specific structure of the first compression cylinder 120 and the second compression cylinder 130 is not limited. In this scheme, the compressor 100 also includes a motor assembly 140. The motor assembly 140 is driven to the first compression cylinder 120 and the second compression cylinder 130 through a crankshaft 150. The first compression cylinder 120 includes a first muffler 123, a first bearing, and a first cylinder 124. The second compression cylinder 130 includes a second muffler 133, a second bearing, and a second cylinder 134. A partition is provided between the first cylinder 124 and the second cylinder 134. The first muffler 123, the first bearing, the first cylinder 124, the partition, the second cylinder 134, the second bearing, and the second muffler 133 are arranged sequentially from top to bottom along the axial direction of the crankshaft 150. The first muffler 123 is provided with an exhaust port, and the second muffler 133 is provided with an exhaust port. That is, the outlet 122 of the first compression cylinder is located on the first muffler 123, and the outlet 132 of the second compression cylinder is located on the second muffler 133.

[0052] The oil-gas separator 310 has a separation chamber and an oil-gas inlet 311, an air outlet 313, and an oil outlet 312 communicating with the separation chamber. The specific structure of the oil-gas separator 310 is not limited, as long as it can separate the oil-gas mixture flowing into the separation chamber. The specific positions of the oil-gas inlet 311, air outlet 313, and oil outlet 312 on the oil-gas separator 310 are not limited, for example but not limited to: the oil-gas inlet 311 can be located in the lower half of the oil-gas separator 310; the air outlet 313 can be located at the upper end of the oil-gas separator 310; and the oil outlet 312 can be located on the side wall and / or bottom wall of the oil-gas separator 310. The air outlet 313 can be orifice-shaped or open-ended, and the specific form is not limited here.

[0053] The flow path from the inlet 212 of the first liquid storage chamber to the inlet 121 of the first compression cylinder is a return oil section 230. The oil outlet 312 is connected to the return oil section 230 via a switching device 320. That is, the oil outlet 312 can be connected to the inlet 212 of the first liquid storage chamber via the switching device 320 to form a return oil flow path; alternatively, the oil outlet 312 can be connected to the interior of the first liquid storage chamber 211 via the switching device 320 to form a return oil flow path; alternatively, the oil outlet 312 can be connected to the inlet 121 of the first compression cylinder via the switching device 320 to form a return oil flow path; alternatively, the outlet 213 of the first liquid storage chamber can be connected to the inlet 121 of the first compression cylinder via the first liquid storage connecting pipe 240, and the oil outlet 312 can be connected to the first liquid storage connecting pipe 240 via the switching device 320 to form a return oil flow path. In other words, the switching device 320 only needs to be able to control the oil discharged from the oil outlet 312 of the oil-gas separator 310 to flow back to the return oil section 230 and then into the first compression cylinder 120. The specific structure of the switching device 320 is not limited; it can be a combination of valve body and pipeline, or a structure with multiple valve bodies. The switching device 320 only needs to be able to control the oil discharged from the oil outlet 312 of the oil-gas separator 310 to flow back to the receiving cavity 111 and / or the return oil section 230. Specifically, under preset operating conditions, the switching device 320 can control the oil discharged from the oil outlet 312 of the oil-gas separator 310 to simultaneously flow back to the receiving cavity 111 and the return oil section 230, thereby improving the applicability of the compression device 10.

[0054] The outlet 122 of the first compression cylinder is connected to the first exhaust port 112 via the receiving cavity 111. That is, the outlet 122 of the first compression cylinder is connected to the first exhaust port 112 through the receiving cavity 111 in the housing 110. The gas discharged from the outlet 122 of the first compression cylinder will pass through the receiving cavity 111 and then be discharged from the first exhaust port 112. The exhaust method of the first compression cylinder 120 is non-direct discharge.

[0055] The outlet 132 of the second compression cylinder is connected to the second exhaust port 113, meaning the outlet 132 of the second compression cylinder is directly connected to the second exhaust port 113, and the gas discharged from the outlet 132 of the second compression cylinder will be directly discharged from the second exhaust port 113. In this scheme, the outlet 132 of the second compression cylinder is directly connected to the second exhaust port 113 through a pipeline, and the exhaust method of the second compression cylinder 130 is direct discharge.

[0056] In the technical solution of the present invention, the compression device 10 includes a compressor 100, a liquid storage mechanism 200, and an oil separation mechanism 300. The oil separation mechanism 300 includes an oil-gas separator 310 and a switching device 320. The oil-gas separator 310 is located outside the housing 110 and has an oil-gas inlet 311, an oil outlet 312, and a gas outlet 313. The oil-gas inlet 311 is connected to the second exhaust port 113. The oil outlet 312 is connected to the receiving cavity 111 and the oil return section 230 respectively via the switching device 320. The switching device 320 is used to control the oil discharged from the oil-gas separator 310 to flow back to the receiving cavity 111 and / or the oil return section 230. That is, the oil outlet 312 of the oil-gas separator 310 is connected to the receiving cavity 111 via the switching device 320 to form one oil return path, and the oil outlet 312 of the oil-gas separator 310 is connected to the oil return section 230 via the switching device 320 to form another oil return path. The two oil return paths are controlled by the switching device 320 so that the oil discharged from the oil outlet 312 of the oil-gas separator 310 can flow back to the receiving cavity 111 of the housing 110 and / or the inlet 121 of the first compression cylinder. The compression device 10 can select different oil return paths according to different working conditions, which not only improves the oil return capacity of the compressor 100, but also improves the energy efficiency of the compressor 100.

[0057] For example, when the operating parameters of compressor 100 exceed the preset parameter range, the operating condition of compressor 100 becomes unstable. At this time, the discharge pressure of the outlet 122 of the first compression cylinder is greater than the discharge pressure of the outlet 132 of the second compression cylinder. The lubricating oil discharged from the second compression cylinder 130 cannot flow back smoothly into the receiving cavity 111. In this case, the lubricating oil discharged from the second compression cylinder 130 can be controlled by the switching device 320 to flow back to the lower pressure return oil section 230. That is, by using the pressure difference between the high pressure of the oil-gas separator 310 and the low pressure of the inlet 121 of the first compression cylinder, the lubricating oil can flow back smoothly into the first compression cylinder 120, so as to realize the function of smooth oil return of compressor 100.

[0058] When the operating parameters of the compressor 100 are within the preset parameter range, and the discharge pressure of the outlet 132 of the second compression cylinder is less than or equal to the discharge pressure of the outlet 122 of the first compression cylinder, the operating condition of the compressor 100 is stable. However, the lubricating oil discharged from the second compression cylinder 130 cannot flow back smoothly into the receiving cavity 111. In this case, the lubricating oil discharged from the second compression cylinder 130 can be controlled by the switching device 320 to flow back to the lower pressure return oil section 230. That is, by using the pressure difference between the high pressure of the oil-gas separator 310 and the low pressure of the inlet 121 of the first compression cylinder, the lubricating oil can flow back smoothly into the first compression cylinder 120, so as to realize the function of smooth oil return of the compressor 100.

[0059] When the operating parameters of the compressor 100 are within the preset parameter range, and the discharge pressure of the outlet 132 of the second compression cylinder is greater than the discharge pressure of the outlet 122 of the first compression cylinder, the operating condition of the compressor 100 is stable. However, if the discharge temperature of the second compression cylinder 130 and the temperature of the discharged lubricating oil are too high, and the lubricating oil with excessive temperature flows back to the first liquid storage chamber 211, it will heat the refrigerant in the first liquid storage chamber 211. This will cause the intake temperature of the first compression cylinder 120 to be too high. The high temperature intake will reduce the efficiency of the compressor 100 and increase energy consumption. In this case, the switching device 320 can be used to control the lubricating oil with excessive temperature to flow directly back to the receiving chamber 111. In this way, the compressor 100 is improved in terms of energy efficiency while ensuring oil return.

[0060] Therefore, in the technical solution of this application, the compression device 10 can control the oil discharged from the oil-gas separator 310 to flow back to the receiving cavity 111 and / or the oil return section 230 through the switching device 320. The compression device 10 can select different oil return paths according to different working conditions, which not only improves the oil return capacity of the compressor 100, but also improves the energy efficiency of the compressor 100.

[0061] Please see Figure 1 In one embodiment, the switching device 320 includes a switching component 321, a return oil connection pipe 322, a first return oil pipe 323, and a second return oil pipe 324. The switching component 321 has a first interface, a second interface, and a third interface that are interconnected. The first interface is connected to the receiving cavity 111 via the first return oil pipe 323, the second interface is connected to the return oil section 230 via the second return oil pipe 324, and the third interface is connected to the oil outlet 312 via the return oil connection pipe 322. The switching component 321 is used to control the connection and disconnection between the oil outlet 312 and the receiving cavity 111 and / or the return oil section 230.

[0062] It is understood that the first interface is connected to the receiving cavity 111 via the first oil return pipe 323, and the third interface is connected to the oil outlet 312 via the oil return connecting pipe 322, forming an oil return flow path. This allows the lubricating oil discharged from the oil outlet 312 of the oil-gas separator 310 to flow back into the receiving cavity 111 via the oil return connecting pipe 322, the switching component 321, and the first oil return pipe 323, thereby realizing the oil return function of the compressor 100. The second interface is connected to the oil return section 230 via the second oil return pipe 324, and the third interface is connected to the oil outlet 312 via the oil return connecting pipe 322, forming another oil return flow path. This allows the lubricating oil discharged from the oil outlet 312 of the oil-gas separator 310 to flow back into the first compression cylinder 120 via the oil return connecting pipe 322, the switching component 321, and the second oil return pipe 324, thereby realizing the oil return function of the compressor 100.

[0063] Therefore, by setting the switching device 320, the lubricating oil discharged from the oil outlet 312 of the oil-gas separator 310 can flow back to the compressor 100 along two different return oil flow paths. The compressor 10 can select different return oil flow paths according to different working conditions, which not only improves the oil return capacity of the compressor 100, but also improves the energy efficiency of the compressor 100.

[0064] In one embodiment, the liquid storage mechanism 200 includes a liquid storage body and a first liquid storage connecting pipe 240. The liquid storage body has a first liquid storage chamber 211. The outlet 213 of the first liquid storage chamber is connected to the inlet 121 of the first compression cylinder via the first liquid storage connecting pipe 240. The second oil return pipe 324 is connected to at least one of the following: the inlet 212 of the first liquid storage chamber, the interior of the first liquid storage chamber 211, the outlet 213 of the first liquid storage chamber, the first liquid storage connecting pipe 240, and the inlet 121 of the first compression cylinder.

[0065] It is understandable that the inlet 212 of the first liquid storage chamber, the interior of the first liquid storage chamber 211, the outlet 213 of the first liquid storage chamber, the first liquid storage connecting pipe 240 and the inlet 121 of the first compression cylinder are connected to form the oil return section 230. The second oil return pipe 324 can be connected to one or more of the following: the inlet 212 of the first liquid storage chamber, the interior of the first liquid storage chamber 211, the outlet 213 of the first liquid storage chamber, the first liquid storage connecting pipe 240, and the inlet 121 of the first compression cylinder. For example, but not limited to: the second oil return pipe 324 is connected to the inlet 212 of the first liquid storage chamber and the first liquid storage connecting pipe 240 respectively; or, the second oil return pipe 324 is connected to the inlet 212 of the first liquid storage chamber and the inlet 121 of the first compression cylinder respectively; or, the second oil return pipe 324 is connected to the inlet 212 of the first liquid storage chamber, the interior of the first liquid storage chamber 211, the outlet 213 of the first liquid storage chamber, the first liquid storage connecting pipe 240, and the inlet 121 of the first compression cylinder. Such a configuration is beneficial to improving the oil return effect of the compressor 100 and enhancing the oil return effect.

[0066] Please see Figure 2 In one embodiment, the switching component 321 includes a pipe joint 3211, a first valve body 3212 and a second valve body 3213. The pipe joint 3211 has a first interface, a second interface and a third interface. The first valve body 3212 is disposed on the first return oil pipe 323 and the second valve body 3213 is disposed on the second return oil pipe 324.

[0067] It is understood that the pipe joint 3211 can be a tee joint or a multi-way joint, depending on the specific requirements. In this embodiment, the pipe joint 3211 is a tee joint. The types of the first valve body 3212 and the second valve body 3213 are not limited; they can be solenoid valves or throttle valves. By placing the first valve body 3212 on the first return oil pipe 323 and the second valve body 3213 on the second return oil pipe 324, the first valve body 3212 can control the opening and closing of one return oil flow path, and the second valve body 3213 can control the opening and closing of the other return oil flow path. The first valve body 3212 and the second valve body 3213 do not affect each other, which helps to improve the stability of the switching device 320 control.

[0068] In one embodiment, the first valve body 3212 is a solenoid valve or a throttle valve; and / or, the second valve body 3213 is a solenoid valve or a throttle valve. It is understood that solenoid valves have fast opening and closing speeds and can respond quickly. Throttle valves can be precisely adjusted, have a stable structure, and a long service life. This solution helps improve the reliability of the switching device 320.

[0069] Please see Figure 3 In one embodiment, the first valve body 3212 is a one-way valve, which is configured to unidirectionally flow from the first interface to the receiving cavity 111. This configuration means that when the pressure of the lubricating oil discharged from the oil-gas separator 310 is greater than the pressure inside the receiving cavity 111, the lubricating oil can smoothly flow back into the receiving cavity 111 under the action of the pressure difference, which is beneficial to improving the oil return efficiency of the compressor 100.

[0070] It should be noted that the second valve body 3213 in this solution is a non-one-way valve, that is, it is not a one-way valve, so as to prevent the high-temperature and high-pressure lubricating oil discharged from the oil-gas separator 310 from flowing directly back to the first liquid storage chamber 211 and heating the refrigerant in the first liquid storage chamber 211. This avoids the situation where the intake temperature of the first compression cylinder 120 is too high, the high-temperature intake reduces the efficiency of the compressor 100 and leads to an increase in energy consumption. This solution is beneficial to improving the energy efficiency of the compressor 100.

[0071] Please see Figure 4 In one embodiment, the switching component 321 includes a switching valve 3214 having a first interface, a second interface and a third interface. The switching valve 3214 is used to control the flow of oil flowing into the return oil connection pipe 322 along the first return oil pipe 323 and / or the second return oil pipe 324.

[0072] It is understandable that the switching valve 3214 can be a single multi-way valve. A single multi-way valve helps to simplify the structure of the switching assembly 321, improve assembly efficiency, and reduce manufacturing costs.

[0073] In one embodiment, the switching valve 3214 is a three-way valve. The first port of the three-way valve is connected to the first return oil pipe 323, the second port is connected to the second return oil pipe 324, and the third port is connected to the return oil connection pipe 322. It is understood that the three-way valve has a simple structure and is easy to control. The three-way valve can be a two-position three-way valve, specifically a two-position three-way solenoid valve. Two-position three-way solenoid valves have a simple structure, fast response, and high reliability.

[0074] Please see Figure 1 In one embodiment, the liquid storage mechanism 200 includes a first liquid storage device 210, a second liquid storage device 220, a first liquid storage connecting pipe 240, and a second liquid storage connecting pipe 250. The first liquid storage device 210 has a first liquid storage chamber 211 and is connected to the inlet 121 of the first compression cylinder via the first liquid storage connecting pipe 240. The second liquid storage device 220 has a second liquid storage chamber 221 and is connected to the inlet 131 of the second compression cylinder via the second liquid storage connecting pipe 250.

[0075] It is understandable that the first liquid reservoir 210 and the second liquid reservoir 220 are independent of each other and do not affect each other, which helps to improve the stability of the compression device 10. The first liquid reservoir connecting pipe 240 can be inserted through the first return air port and connect the first liquid reservoir 210 and the inlet 121 of the first compression cylinder, while the second liquid reservoir connecting pipe 250 can be inserted through the second return air port and connect the second liquid reservoir 220 and the inlet 131 of the second compression cylinder. By setting the first liquid reservoir connecting pipe 240 and the second liquid reservoir connecting pipe 250, it is convenient to assemble the first liquid reservoir 210 and the second liquid reservoir 220 separately, which helps to simplify the assembly process of the compression device 10.

[0076] In one embodiment, the compressor 100 is a dual-suction, dual-row compressor. It is understood that the dual-suction, dual-row compressor draws in gas through two return ports, and combined with the dual-row design, it achieves high compression efficiency. Furthermore, the dual-suction, dual-row compressor, in conjunction with the oil separator 300 of this solution, not only gives the compressor 100 strong oil return capability, but also high energy efficiency.

[0077] The present invention also proposes a heat exchange system, which includes a compression device 10 as described above. The specific structure of the compression device 10 is as described in the above embodiments. Since the heat exchange system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0078] In one embodiment, the heat exchange system further includes a detection component and a control device, the control device being electrically connected to the detection component and the switching device 320 respectively; the detection component is used to detect the operating parameters of the compressor 100, the operating parameters of the compressor 100 including at least one of suction pressure, suction temperature, discharge pressure, and discharge temperature; the control device is used to control the compressor 10 to enter a first operating mode when the operating parameters of the compressor 100 exceed a preset parameter range;

[0079] In the first working mode, the control device controls the switching device 320 to disconnect the oil outlet 312 from the receiving cavity 111, and also controls the switching device 320 to connect the oil outlet 312 to the return oil section 230, so that the oil discharged by the oil-gas separator 310 can flow back to the return oil section 230.

[0080] Understandably, when the operating parameters of compressor 100 exceed the preset parameter range, the operating condition of compressor 100 becomes unstable. In this case, the discharge pressure at outlet 122 of the first compression cylinder may be greater than the discharge pressure at outlet 132 of the second compression cylinder. The lubricating oil discharged from the second compression cylinder 130 cannot flow smoothly back into the receiving cavity 111. Under these circumstances, the control device controls the compression device 10 to enter the first operating mode. In the first operating mode, the oil discharged from the oil-gas separator 310 flows back to the oil return section 230, and is then compressed by the first compression cylinder 120 before being discharged into the receiving cavity 111, thus achieving the function of smooth oil return from compressor 100.

[0081] In one embodiment, the control device is further configured to control the compression device 10 to enter a second working mode when the operating parameters of the compressor 100 are within a preset parameter range and the exhaust pressure of the outlet 132 of the second compression cylinder is less than or equal to the exhaust pressure of the outlet 122 of the first compression cylinder.

[0082] In the second working mode, the control device controls the switching device 320 to disconnect the oil outlet 312 from the receiving cavity 111, and also controls the switching device 320 to connect the oil outlet 312 to the return oil section 230, so that the oil discharged by the oil-gas separator 310 can flow back to the return oil section 230.

[0083] Understandably, when the operating parameters of compressor 100 are within the preset parameter range, and the discharge pressure of outlet 132 of the second compression cylinder is less than or equal to the discharge pressure of outlet 122 of the first compression cylinder, the operating condition of compressor 100 is stable. However, the lubricating oil discharged from the second compression cylinder 130 cannot flow smoothly back into the receiving cavity 111. In this case, the control device controls the compression device 10 to enter the second operating mode. In the second operating mode, the oil discharged from the oil-gas separator 310 flows back to the oil return section 230, and is then compressed by the first compression cylinder 120 before being discharged into the receiving cavity 111, thereby achieving the function of smooth oil return from compressor 100.

[0084] In one embodiment, the control device is used to control the compression device 10 to enter a third working mode when the operating parameters of the compressor 100 are within a preset parameter range and the exhaust pressure of the outlet 132 of the second compression cylinder is greater than the exhaust pressure of the outlet 122 of the first compression cylinder.

[0085] In the third working mode, the control device controls the switching device 320 to disconnect the oil outlet 312 from the oil return section 230, and also controls the switching device 320 to connect the oil outlet 312 to the receiving cavity 111, so that the oil discharged by the oil-gas separator 310 can flow back to the receiving cavity 111.

[0086] Understandably, when the operating parameters of compressor 100 are within the preset parameter range, and the discharge pressure at outlet 132 of the second compression cylinder is greater than the discharge pressure at outlet 122 of the first compression cylinder, the operating condition of compressor 100 is stable. However, if the discharge temperature of the second compression cylinder 130 and the temperature of the discharged lubricating oil are too high, and the excessively hot lubricating oil flows back into the first liquid storage chamber 211, it will heat the refrigerant in the first liquid storage chamber 211. This will cause the intake temperature of the first compression cylinder 120 to be too high. High-temperature intake air will reduce the efficiency of compressor 100, leading to increased energy consumption. In this case, the control device controls the compressor 10 to enter the third operating mode. In the third operating mode, the oil discharged from the oil-gas separator 310 flows directly back into the receiving chamber 111, thus ensuring oil return to compressor 100 while also improving the energy efficiency of compressor 100.

[0087] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A compression device, characterized in that, include: A compressor includes a housing, a first compression cylinder, and a second compression cylinder. The housing has a receiving cavity, a first exhaust port, and a second exhaust port. The first compression cylinder and the second compression cylinder are disposed in the receiving cavity. The compressor is a double-suction double-exhaust compressor. The operating parameters of the compressor include at least one of suction pressure, suction temperature, exhaust pressure, and exhaust temperature. The liquid storage mechanism has a first liquid storage chamber and a second liquid storage chamber. The outlet of the first liquid storage chamber is connected to the inlet of the first compression cylinder. The flow path from the inlet of the first liquid storage chamber to the inlet of the first compression cylinder is a return oil section. The outlet of the first compression cylinder is connected to the first exhaust port through the receiving chamber. The outlet of the second liquid storage chamber is connected to the inlet of the second compression cylinder. The outlet of the second compression cylinder is connected to the second exhaust port. An oil separation mechanism includes an oil-gas separator and a switching device. The oil-gas separator is located outside the housing and has an oil-gas inlet, an oil outlet, and a gas outlet. The oil-gas inlet is connected to a second exhaust port, and the oil outlet is connected to the receiving cavity and the oil return section via the switching device. The switching device is used to control the oil discharged from the oil-gas separator to flow back to the receiving cavity and / or the oil return section. When the operating parameters of the compressor are within the preset parameter range, and the exhaust pressure at the outlet of the second compression cylinder is less than or equal to the exhaust pressure at the outlet of the first compression cylinder, the compression device enters the second working mode. In the second working mode, the switching device disconnects the oil outlet from the receiving cavity and connects the oil outlet to the oil return section. When the operating parameters of the compressor are within the preset parameter range and the exhaust pressure at the outlet of the second compression cylinder is greater than the exhaust pressure at the outlet of the first compression cylinder, the compression device enters a third operating mode. In the third operating mode, the switching device disconnects the oil outlet from the oil return section and connects the oil outlet to the receiving cavity.

2. The compression device as described in claim 1, characterized in that, The switching device includes a switching component, a return oil connection pipe, a first return oil pipe, and a second return oil pipe. The switching component has a first interface, a second interface, and a third interface that are interconnected. The first interface is connected to the receiving cavity via the first return oil pipe, the second interface is connected to the return oil section via the second return oil pipe, and the third interface is connected to the oil outlet via the return oil connection pipe. The switching component is used to control the connection and disconnection between the oil outlet and the receiving cavity and / or the return oil section.

3. The compression device as described in claim 2, characterized in that, The liquid storage mechanism includes a liquid storage body and a first liquid storage connecting pipe. The liquid storage body has a first liquid storage chamber. The outlet of the first liquid storage chamber is connected to the inlet of the first compression cylinder via the first liquid storage connecting pipe. The second oil return pipe is connected to at least one of the inlet of the first liquid storage chamber, the interior of the first liquid storage chamber, the outlet of the first liquid storage chamber, the first liquid storage connecting pipe, and the inlet of the first compression cylinder.

4. The compression device as described in claim 2, characterized in that, The switching assembly includes a pipe joint, a first valve body, and a second valve body. The pipe joint has a first interface, a second interface, and a third interface. The first valve body is located on the first return oil pipe, and the second valve body is located on the second return oil pipe.

5. The compression device as described in claim 4, characterized in that, The first valve body is a solenoid valve or a throttle valve; And / or, the second valve body is a solenoid valve or a throttle valve.

6. The compression device as described in claim 4, characterized in that, The first valve body is a one-way valve, which is configured to allow one-way flow from the first interface to the receiving cavity.

7. The compression device as claimed in claim 2, characterized in that, The switching component includes a switching valve having a first interface, a second interface, and a third interface. The switching valve is used to control the flow of oil flowing into the return oil connection pipe along the first return oil pipe and / or the second return oil pipe.

8. The compression device as claimed in claim 7, characterized in that, The switching valve is a three-way valve. The first port of the three-way valve is connected to the first return oil pipe, the second port of the three-way valve is connected to the second return oil pipe, and the third port of the three-way valve is connected to the return oil connection pipe.

9. The compression device as claimed in claim 1, characterized in that, The liquid storage mechanism includes a first liquid reservoir, a second liquid reservoir, a first liquid reservoir connecting pipe, and a second liquid reservoir connecting pipe. The first liquid reservoir has a first liquid reservoir chamber and is connected to the inlet of a first compression cylinder via the first liquid reservoir connecting pipe. The second liquid reservoir has a second liquid reservoir chamber and is connected to the inlet of a second compression cylinder via the second liquid reservoir connecting pipe.

10. A heat exchange system, characterized in that, Includes the compression device as described in any one of claims 1 to 9.

11. The heat exchange system as claimed in claim 10, characterized in that, The heat exchange system further includes a detection component and a control device, the control device being electrically connected to the detection component and the switching device respectively; the detection component is used to detect the operating parameters of the compressor. The control device is used to control the compressor to enter a first working mode when the operating parameters of the compressor exceed the preset parameter range. In the first working mode, the control device controls the switching device to disconnect the oil outlet from the receiving cavity, and also controls the switching device to connect the oil outlet to the return section, so that the oil discharged from the oil-gas separator can flow back to the return section.

12. The heat exchange system as claimed in claim 11, characterized in that, The control device is also used to control the compression device to enter a second working mode when the operating parameters of the compressor are within the preset parameter range and the exhaust pressure at the outlet of the second compression cylinder is less than or equal to the exhaust pressure at the outlet of the first compression cylinder. In the second working mode, the control device controls the switching device to disconnect the oil outlet from the receiving cavity, and also controls the switching device to connect the oil outlet to the return section, so that the oil discharged from the oil-gas separator can flow back to the return section.

13. The heat exchange system as claimed in claim 11, characterized in that, The control device is also used to control the compression device to enter a third working mode when the operating parameters of the compressor are within the preset parameter range and the exhaust pressure at the outlet of the second compression cylinder is greater than the exhaust pressure at the outlet of the first compression cylinder. In the third operating mode, the control device controls the switching device to disconnect the oil outlet from the oil return section, and also controls the switching device to connect the oil outlet to the receiving cavity, so that the oil discharged from the oil-gas separator can flow back to the receiving cavity.

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