Compression device and heat exchange system

Abstract

The invention 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 machine shell, a first compression cylinder and a second compression cylinder, and the machine shell is provided with a containing cavity, a first exhaust port and a second exhaust port; the liquid storage mechanism is provided with a first liquid storage cavity and a second liquid storage cavity, an outlet of the first liquid storage cavity is communicated with an 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, an outlet of the second liquid storage cavity is communicated with an inlet of the second compression cylinder, and an 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 is provided with an oil-gas inlet, an oil outlet and a gas 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, and the switching device is used for controlling oil discharged by the oil-gas separator to flow back to the containing cavity and / or the oil return section.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a compression device and a heat exchange system. Background Art

[0002] In an existing heat exchange system, such as an air conditioning system during use, the oil return capacity of the compressor is poor. Especially in a double-suction and double-row compressor, a large amount of lubricating oil will directly discharge from the exhaust hole of one cylinder along the pipeline to the outside of the compressor. As a result, the oil discharge rate of the compressor is high, the oil return capacity of the compressor is poor, and the compressor may be damaged due to lack of oil. Summary of the Invention

[0003] The main object of the present invention is to propose a compression device, aiming to solve the problem of poor oil return capacity of the compressor in the existing heat exchange system.

[0004] To achieve the above object, the present invention proposes a compression device, which includes:

[0005] A compressor, including 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;

[0006] A liquid storage mechanism, having 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 the 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 first compression cylinder is communicated with the first exhaust port through the receiving cavity. 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;

[0007] An oil separation mechanism, including an oil-gas separator and a switching device. The oil-gas separator is disposed outside the housing. The oil-gas separator has an oil-gas inlet, an oil outlet, and a gas outlet. The oil-gas inlet is communicated with the second exhaust port. The oil outlet is communicated with the receiving cavity and the oil return section respectively through 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 an embodiment, the switching device includes a switching component, an oil return connecting pipe, a first oil return pipe, and a second oil return pipe. The switching component has a first interface, a second interface, and a third interface that are interconnected. The first interface is communicated with the receiving cavity through the first oil return pipe. The second interface is communicated with the oil return section through the second oil return pipe. The third interface is communicated with the oil outlet through the oil return connecting pipe. The switching component is used to control the on-off of the oil outlet and the receiving cavity and / or the oil return 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 the first liquid storage cavity. The outlet of the first liquid storage cavity is communicated with the inlet of the first compression cylinder through the first liquid storage connecting pipe. The second oil return pipe is communicated with at least one of the inlet of the first liquid storage cavity, the inside of the first liquid storage cavity, the outlet of the first liquid storage cavity, 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 the first interface, the second interface, and the third interface. The first valve body is arranged on the first oil return pipe, and the second valve body is arranged on the second oil return 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 check valve, and the check valve is configured to conduct unidirectionally from the first interface to the accommodation cavity.

[0014] In one embodiment, the switching assembly includes a switching valve. The switching valve has the first interface, the second interface, and the third interface. The switching valve is used to control the oil flowing into the oil return connecting pipe to flow along the first oil return pipe and / or the second oil return pipe.

[0015] In one embodiment, the switching valve is a three-way valve. The first interface of the three-way valve is communicated with the first oil return pipe, the second interface of the three-way valve is communicated with the second oil return pipe, and the third interface of the three-way valve is communicated with the oil return connecting pipe.

[0016] In one embodiment, the liquid storage mechanism includes a first liquid storage device, a second liquid storage device, a first liquid storage connecting pipe, and a second liquid storage connecting pipe. The first liquid storage device has the first liquid storage cavity. The first liquid storage device is communicated with the inlet of the first compression cylinder through the first liquid storage connecting pipe. The second liquid storage device has the second liquid storage cavity. The second liquid storage device is communicated with the inlet of the second compression cylinder through the second liquid storage connecting pipe;

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

[0018] The present invention also provides a heat exchange system, and the heat exchange system includes the compression device as described above.

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

[0020] The control device is used to control the compression device to enter the 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 accommodating cavity, and also controls the switching device to conduct the oil outlet to the oil return section, so that the oil discharged from the oil-gas separator can flow back to the oil return section.

[0022] In one embodiment, the control device is further used to control the compression device to enter the second working mode when the operating parameters of the compressor are within the preset parameter 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.

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

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

[0025] In the third working 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 conduct the oil outlet to the accommodating cavity, so that the oil discharged from the oil-gas separator can flow back to the accommodating cavity.

[0026] In the technical solution of the present 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 arranged outside the machine shell. The oil-gas separator has an oil-gas inlet, an oil outlet and a gas outlet. The oil-gas inlet is communicated with the second exhaust port. The oil outlet is communicated with the accommodation cavity and the oil return section respectively through the switching device. The switching device is used to control the oil discharged from the oil-gas separator to flow back to the accommodation cavity and / or the oil return section. With such a setting, that is, the oil outlet of the oil-gas separator is communicated with the accommodation cavity through the switching device to form an oil return flow path, and the oil outlet of the oil-gas separator is communicated with the oil return section through the switching device to form another oil return flow path. The two oil return 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 into the accommodation cavity of the machine shell and / or the inlet of the first compression cylinder. The compression device can select different oil return flow paths according to different working conditions. In this way, not only the oil return capacity of the compressor is improved, but also the energy efficiency of the compressor is improved.

[0027] For example, when the operating parameters of the compressor exceed the preset parameter range, the operating condition of the compressor is unstable. At this time, the exhaust pressure at the outlet of the first compression cylinder is greater than the exhaust pressure at the outlet of the second compression cylinder. The lubricating oil discharged from the second compression cylinder cannot directly and smoothly flow back into the accommodation cavity. In this case, the switching device can be used to control the lubricating oil discharged from the second compression cylinder to flow back to the oil return section with a lower pressure, that is, by using 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 smoothly flow back into the first compression cylinder to achieve the function of smooth oil return of the compressor.

[0028] 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 operating condition of the compressor is stable, but the lubricating oil discharged from the second compression cylinder cannot directly and smoothly flow back into the accommodation cavity. In this case, the switching device can be used to control the lubricating oil discharged from the second compression cylinder to flow back to the oil return section with a lower pressure, that is, by using 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 smoothly flow back into the first compression cylinder to achieve the function of smooth oil return of the compressor.

[0029] 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 operating condition of the compressor is stable. However, the exhaust temperature of the second compression cylinder and the temperature of the discharged lubricating oil are too high. If the lubricating oil with too high temperature flows back to the first liquid storage cavity, it will heat the refrigerant in the first liquid storage cavity, which will cause the intake temperature of the first compression cylinder to be too high. The high-temperature intake air will reduce the efficiency of the compressor and increase the energy consumption. In this case, the switching device can be used to control the lubricating oil with too high temperature to directly flow back to the accommodating cavity. In this way, while ensuring the oil return of the compressor, the energy efficiency of the compressor is also improved.

[0030] It can be seen that in the technical solution of the present application, the compression device can control the oil discharged from the oil-gas separator to flow back to the accommodating cavity and / or the oil return section through the switching device. The compression device can select different oil return flow paths according to different operating conditions, which not only improves the oil return ability of the compressor but also improves the energy efficiency of the compressor. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0032] Figure 1 Structural schematic diagram of the first embodiment of the compression device provided by the present invention;

[0033] Figure 2 Structural schematic diagram of the second embodiment of the compression device provided by the present invention;

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

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

[0036] Explanation of the reference numerals in the drawings:

[0037] 10. Compression device;

[0038] 100. Compressor; 110. Housing; 111. Accommodation 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 silencer cover; 124. First cylinder; 130. Second compression cylinder; 131. Inlet of the second compression cylinder; 132. Outlet of the second compression cylinder; 133. Second silencer cover; 134. Second cylinder; 140. Motor assembly; 150. Crankshaft;

[0039] 200. Liquid storage mechanism; 210. First liquid storage device; 211. First liquid storage cavity; 212. Inlet of the first liquid storage cavity; 213. Outlet of the first liquid storage cavity; 220. Second liquid storage device; 221. Second liquid storage cavity; 222. Outlet of the second liquid storage cavity; 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 component; 3211. Pipe joint; 3212. First valve body; 3213. Second valve body; 3214. Switching valve; 322. Oil return connecting pipe; 323. First oil return pipe; 324. Second oil return pipe.

[0041] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] In an existing heat exchange system, such as an air conditioning system during use, the oil return capacity of the compressor is poor. Especially in a double-suction and double-row compressor, a large amount of lubricating oil will directly discharge out of the compressor along the pipeline from the exhaust hole of one of the cylinders. As a result, the oil output rate of the compressor is high, the oil return capacity of the compressor is poor, and the compressor may be damaged due to lack of oil.

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

[0047] Please refer to Figure 1 , in an embodiment of the present 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 arranged in the receiving cavity 111; the liquid storage mechanism 200 has a first liquid storage cavity 211 and a second liquid storage cavity 221. The outlet 213 of the first liquid storage cavity is communicated with the inlet 121 of the first compression cylinder. A section of the flow path from the inlet 212 of the first liquid storage cavity to the inlet 121 of the first compression cylinder is an oil return section 230. The outlet 122 of the first compression cylinder is communicated with the first exhaust port 112 through the receiving cavity 111. The outlet 222 of the second liquid storage cavity is communicated with the inlet 131 of the second compression cylinder, and the outlet 132 of the second compression cylinder is communicated with 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 arranged 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 communicated with the second exhaust port 113. The oil outlet 312 is communicated with the receiving cavity 111 and the oil return section 230 respectively through 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.

[0048] It is understandable that the compressor 100 can be a rotary compressor. Of course, it can also be other types of compressors, which are not specifically defined here. In this solution, the compressor 100 is a rolling piston compressor. The compressor 100 includes a housing 110. The housing 110 has a suction port and a discharge port. The suction port is for the refrigerant to flow in, and the discharge port is for the refrigerant to flow out. The number of the suction port and the discharge port can be two or more, and the specific positions of the suction port and the discharge port on the housing 110 are not limited either. Specifically, in this solution, the housing 110 has a first suction port, a second suction port, a first discharge port 112, and a second discharge port 113. The first suction port and the second suction port are arranged on the outer peripheral wall of the housing 110 near the bottom end. The first discharge port 112 is arranged at the top end of the housing 110, and the second discharge port 113 is arranged on the outer peripheral wall of the housing 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 arranged in the same liquid storage device or in different liquid storage devices. That is to say, a liquid storage device can have both the first liquid storage chamber 211 and the second liquid storage chamber 221 at the same time; or, one liquid storage device has the first liquid storage chamber 211, and another liquid storage device has the second liquid storage chamber 221, which can be specifically set according to needs.

[0050] Furthermore, the first compression cylinder 120 and the second compression cylinder 130 are arranged in the accommodation chamber 111. The outlet 213 of the first liquid storage chamber is communicated with the inlet 121 of the first compression cylinder. The first compression cylinder 120 is used to compress the refrigerant flowing in through the first liquid storage chamber 211 to the required pressure and then discharge it from the first discharge port 112; the outlet 222 of the second liquid storage chamber is communicated with the inlet 131 of the second compression cylinder. The second compression cylinder 130 is used to compress the refrigerant flowing in through the second liquid storage chamber 221 to the required pressure and then discharge it from the second discharge port 113.

[0051] The specific structures of the first compression cylinder 120 and the second compression cylinder 130 are not limited. In this solution, the compressor 100 further includes a motor assembly 140. The motor assembly 140 is drivingly connected to the first compression cylinder 120 and the second compression cylinder 130 through a crankshaft 150. The first compression cylinder 120 includes a first sound insulation cover 123, a first bearing, and a first cylinder 124. The second compression cylinder 130 includes a second sound insulation cover 133, a second bearing, and a second cylinder 134. A middle partition plate is provided between the first cylinder 124 and the second cylinder 134. The first sound insulation cover 123, the first bearing, the first cylinder 124, the middle partition plate, the second cylinder 134, the second bearing, and the second sound insulation cover 133 are arranged in sequence from top to bottom along the axial direction of the crankshaft 150. The first sound insulation cover 123 is provided with an exhaust hole, and the second sound insulation cover 133 is provided with an exhaust hole. That is, the outlet 122 of the first compression cylinder is provided on the first sound insulation cover 123, and the outlet 132 of the second compression cylinder is provided on the second sound insulation cover 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 that communicate with the separation chamber. The specific structure of the oil-gas separator 310 is not limited, and it only needs to be able to separate the oil-gas mixture flowing into the separation chamber. The specific positions of the oil-gas inlet 311, the air outlet 313, and the 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 provided in the lower half of the oil-gas separator 310; the air outlet 313 can be provided at the upper end of the oil-gas separator 310; the oil outlet 312 can be provided on the side wall and / or the bottom wall of the oil-gas separator 310. The air outlet 313 can be in the shape of a hole or an open mouth, 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 the oil return section 230. The oil outlet 312 is communicated with the oil return section 230 through the switching device 320, that is, the oil outlet 312 can be communicated with the inlet 212 of the first liquid storage chamber through the switching device 320 to form an oil return flow path; alternatively, the oil outlet 312 can be communicated with the interior of the first liquid storage chamber 211 through the switching device 320 to form an oil return flow path; or the oil outlet 312 can be communicated with the inlet 121 of the first compression cylinder through the switching device 320 to form an oil return flow path; or the outlet 213 of the first liquid storage chamber is communicated with the inlet 121 of the first compression cylinder through the first liquid storage connecting pipe 240, and the oil outlet 312 is communicated with the first liquid storage connecting pipe 240 through the switching device 320 to form an oil return flow path. That is to say, only the switching device 320 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 oil return section 230 and then flow into the first compression cylinder 120. The specific structure of the switching device 320 is not limited, and it can be a combined structure of a valve body and a pipeline, or a structure of multiple valve bodies. Only the switching device 320 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 accommodation chamber 111 and / or the oil return section 230. Among them, the switching device 320 can control the oil discharged from the oil outlet 312 of the oil-gas separator 310 to flow back to the accommodation chamber 111 and the oil return section 230 simultaneously under the preset working conditions to improve the applicability of the compression device 10.

[0054] The outlet 122 of the first compression cylinder is communicated with the first exhaust port 112 through the accommodation chamber 111, that is, the outlet 122 of the first compression cylinder is connected to the first exhaust port 112 through the accommodation chamber 111 in the machine housing 110. The gas discharged from the outlet 122 of the first compression cylinder will pass through the accommodation chamber 111 and then be discharged from the first exhaust port 112. The exhaust mode of the first compression cylinder 120 is non-direct exhaust.

[0055] The outlet 132 of the second compression cylinder is communicated with the second exhaust port 113, that is, the outlet 132 of the second compression cylinder is directly connected to the second exhaust port 113. The gas discharged from the outlet 132 of the second compression cylinder will be directly discharged from the second exhaust port 113. In this solution, the outlet 132 of the second compression cylinder is directly communicated with the second exhaust port 113 through a pipeline, and the exhaust mode of the second compression cylinder 130 is direct exhaust.

[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 arranged outside the machine shell 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 communicated with the second exhaust port 113. The oil outlet 312 is respectively communicated with the accommodation cavity 111 and the oil return section 230 through 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 accommodation cavity 111 and / or the oil return section 230. With such an arrangement, that is, the oil outlet 312 of the oil-gas separator 310 is communicated with the accommodation cavity 111 through the switching device 320 to form an oil return flow path, and the oil outlet 312 of the oil-gas separator 310 is communicated with the oil return section 230 through the switching device 320 to form another oil return flow path. The two oil return flow 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 into the accommodation cavity 111 of the machine shell 110 and / or the inlet 121 of the first compression cylinder. The compression device 10 can select different oil return flow paths according to different working conditions. In this way, not only the oil return capacity of the compressor 100 is improved, but also the energy efficiency of the compressor 100 is improved.

[0057] For example, when the working parameters of the compressor 100 exceed the preset parameter range, the working condition of the compressor 100 is unstable. At this time, the exhaust pressure at the outlet 122 of the first compression cylinder is greater than the exhaust pressure at the outlet 132 of the second compression cylinder. The lubricating oil discharged from the second compression cylinder 130 cannot directly and smoothly flow back into the accommodation cavity 111. In this case, the switching device 320 can be used to control the lubricating oil discharged from the second compression cylinder 130 to flow back to the oil return section 230 with a lower pressure, that is, by using the pressure difference between the high pressure of the oil-gas separator 310 and the low pressure at the inlet 121 of the first compression cylinder, the lubricating oil can smoothly flow back into the first compression cylinder 120 to achieve the function of smooth oil return of the compressor 100.

[0058] When the working parameters of the compressor 100 are within the preset parameter range and the exhaust pressure at the outlet 132 of the second compression cylinder is less than or equal to the exhaust pressure at the outlet 122 of the first compression cylinder, the working condition of the compressor 100 is stable, but the lubricating oil discharged from the second compression cylinder 130 cannot directly and smoothly flow back into the accommodation cavity 111. In this case, the switching device 320 can be used to control the lubricating oil discharged from the second compression cylinder 130 to flow back to the oil return section 230 with a lower pressure, that is, by using the pressure difference between the high pressure of the oil-gas separator 310 and the low pressure at the inlet 121 of the first compression cylinder, the lubricating oil can smoothly flow back into the first compression cylinder 120 to achieve 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 exhaust pressure at the outlet 132 of the second compression cylinder is greater than the exhaust pressure at the outlet 122 of the first compression cylinder, the operating condition of the compressor 100 is stable. However, the exhaust temperature of the second compression cylinder 130 and the temperature of the discharged lubricating oil are too high. If the lubricating oil with too high temperature flows back to the first liquid storage chamber 211, it will heat the refrigerant in the first liquid storage chamber 211, which will cause the intake temperature of the first compression cylinder 120 to be too high. The high-temperature intake air will reduce the efficiency of the compressor 100 and increase the energy consumption. In this case, the switching device 320 can be used to control the lubricating oil with too high temperature to directly flow back into the accommodation chamber 111. In this way, while ensuring the oil return of the compressor 100, the energy efficiency of the compressor 100 is also improved.

[0060] It can be seen that in the technical solution of the present application, the compression device 10 can control the oil discharged from the oil-gas separator 310 to flow back to the accommodation chamber 111 and / or the oil return section 230 through the switching device 320. The compression device 10 can select different oil return flow paths according to different operating conditions, which not only improves the oil return ability of the compressor 100, but also improves the energy efficiency of the compressor 100.

[0061] Please refer to Figure 1 , in an embodiment, the switching device 320 includes a switching component 321, an oil return connection pipe 322, a first oil return pipe 323 and a second oil return 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 accommodation chamber 111 through the first oil return pipe 323, the second interface is connected to the oil return section 230 through the second oil return pipe 324, and the third interface is connected to the oil outlet 312 through the oil return connection pipe 322. The switching component 321 is used to control the on-off between the oil outlet 312 and the accommodation chamber 111 and / or the oil return section 230.

[0062] It can be understood that the first interface is connected to the accommodation chamber 111 through the first oil return pipe 323, and the third interface is connected to the oil outlet 312 through the oil return connection pipe 322 to form an oil return flow path, so that the lubricating oil discharged from the oil outlet 312 of the oil-gas separator 310 can flow through the oil return connection pipe 322, the switching component 321 and the first oil return pipe 323 and flow back into the accommodation chamber 111 to realize the oil return function of the compressor 100. The second interface is connected to the oil return section 230 through the second oil return pipe 324, and the third interface is connected to the oil outlet 312 through the oil return connection pipe 322 to form another oil return flow path, so that the lubricating oil discharged from the oil outlet 312 of the oil-gas separator 310 can flow through the oil return connection pipe 322, the switching component 321 and the second oil return pipe 324 and flow back to the oil return section 230 and then flow into the first compression cylinder 120 to realize the oil return function of the compressor 100.

[0063] It can be seen that by providing the switching device 320 in this application, 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 oil return flow paths. The compression device 10 can select different oil return flow paths according to different working conditions. In this way, not only the oil return capacity of the compressor 100 is improved, but also the energy efficiency of the compressor 100 is enhanced.

[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 the first liquid storage chamber 211. The outlet 213 of the first liquid storage chamber communicates with the inlet 121 of the first compression cylinder through the first liquid storage connecting pipe 240. The second oil return pipe 324 communicates with at least one of 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 can be understood 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 an oil return section 230. The second oil return pipe 324 can communicate with one or more of 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 communicates with 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 communicates with 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 communicates with 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. With such a setting, it is beneficial to improve the oil return effect of the compressor 100 and enhance the oil return effect.

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

[0067] It can be understood that the pipe joint 3211 can be a tee joint or a multi-way joint, which can be specifically set according to needs. 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, and can be solenoid valves or throttle valves. By arranging the first valve body 3212 on the first oil return pipe 323 and the second valve body 3213 on the second oil return pipe 324, the first valve body 3212 can control the on-off of one oil return flow path, and the second valve body 3213 can control the on-off of another oil return flow path. The first valve body 3212 and the second valve body 3213 do not affect each other, which is beneficial to improving the stability of the control of the switching device 320.

[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 can be understood that the opening and closing speed of the solenoid valve is fast and it can respond quickly. The throttle valve can be accurately adjusted, has a stable structure and a long service life. This solution is beneficial to improving the reliability of the switching device 320.

[0069] Please refer to Figure 3 , in one embodiment, the first valve body 3212 is a check valve, and the check valve is configured to conduct unidirectionally from the first interface to the accommodation cavity 111. With such a setting, that is, when the pressure of the lubricating oil discharged from the oil-gas separator 310 is greater than the pressure in the accommodation cavity 111, the lubricating oil can smoothly flow back into the accommodation 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-check valve, that is, not a check valve, to prevent the high-temperature and high-pressure lubricating oil discharged from the oil-gas separator 310 from directly flowing back into the first liquid storage cavity 211 and heating the refrigerant in the first liquid storage cavity 211, thereby avoiding the situation that the intake temperature of the first compression cylinder 120 is too high, and the high-temperature intake reduces the efficiency of the compressor 100 and increases energy consumption. This solution is beneficial to improving the energy efficiency of the compressor 100.

[0071] Please refer to Figure 4 , in one embodiment, the switching assembly 321 includes a switching valve 3214, the switching valve 3214 has the first interface, the second interface and the third interface, and the switching valve 3214 is used to control the oil flowing into the oil return connecting pipe 322 to flow along the first oil return pipe 323 and / or the second oil return pipe 324.

[0072] It can be understood that the switching valve 3214 can be a single multi-way valve. The single multi-way valve is beneficial to simplifying the structure of the switching assembly 321, improving the assembly efficiency and reducing the manufacturing cost.

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

[0074] Please refer to 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 connection pipe 240 and a second liquid storage connection pipe 250. The first liquid storage device 210 has the first liquid storage chamber 211. The first liquid storage device 210 is communicated with the inlet 121 of the first compression cylinder through the first liquid storage connection pipe 240. The second liquid storage device 220 has the second liquid storage chamber 221. The second liquid storage device 220 is communicated with the inlet 131 of the second compression cylinder through the second liquid storage connection pipe 250.

[0075] It can be understood that the first liquid storage device 210 and the second liquid storage device 220 are independent of each other and do not affect each other, which is beneficial to improving the stability of the compression device 10. Among them, the first liquid storage connection pipe 240 can pass through the first gas return port and communicate the first liquid storage device 210 and the inlet 121 of the first compression cylinder. The second liquid storage connection pipe 250 can pass through the second gas return port and communicate the second liquid storage device 220 and the inlet 131 of the second compression cylinder. By providing the first liquid storage connection pipe 240 and the second liquid storage connection pipe 250, it is convenient to assemble the first liquid storage device 210 and the second liquid storage device 220 respectively, which is beneficial to simplifying the assembly process of the compression device 10.

[0076] In one embodiment, the compressor 100 is a double-suction double-row compressor. It can be understood that the double-suction double-row compressor sucks in gas through two gas return ports and combines with the double-row design, so the compression effect is high. Moreover, the double-suction double-row compressor cooperates with the oil separation mechanism 300 of this solution, which not only enables the compressor 100 to have a strong oil return ability, but also the compressor 100 has high energy efficiency.

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

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

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

[0080] It can be understood that when the operating parameters of the compressor 100 exceed the preset parameter range, the operating condition of the compressor 100 is unstable. At this time, the discharge pressure at the outlet 122 of the first compression cylinder is greater than the discharge pressure at the outlet 132 of the second compression cylinder, and the lubricating oil discharged from the second compression cylinder 130 cannot directly and smoothly flow back into the accommodation chamber 111. In this case, 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 then is discharged into the accommodation chamber 111 after being compressed by the first compression cylinder 120, so as to realize the smooth oil return function of the compressor 100.

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

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

[0083] It can be understood that when the operating parameters of the compressor 100 are within the preset parameter range and the exhaust pressure at the outlet 132 of the second compression cylinder is less than or equal to the exhaust pressure at 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 directly and smoothly flow back into the accommodation chamber 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 then is discharged into the accommodation chamber 111 after being compressed by the first compression cylinder 120, so as to realize the function of smooth oil return of the compressor 100.

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

[0085] In the third operating 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 accommodation chamber 111, so that the oil discharged from the oil-gas separator 310 can flow back to the accommodation chamber 111.

[0086] It can be understood that when the operating parameters of the compressor 100 are within the preset parameter range and the exhaust pressure at the outlet 132 of the second compression cylinder is greater than the exhaust pressure at the outlet 122 of the first compression cylinder, the operating condition of the compressor 100 is stable. However, the exhaust temperature of the second compression cylinder 130 and the temperature of the discharged lubricating oil are too high. If the lubricating oil with too high temperature flows back to the first liquid storage chamber 211, it will heat the refrigerant in the first liquid storage chamber 211, which will cause the intake temperature of the first compression cylinder 120 to be too high. The high-temperature intake air will reduce the efficiency of the compressor 100 and increase the energy consumption. In this case, the control device controls the compression device 10 to enter the third operating mode. In the third operating mode, the oil discharged from the oil-gas separator 310 directly flows back into the accommodation chamber 111. In this way, while ensuring the oil return of the compressor 100, the energy efficiency of the compressor 100 is also improved.

[0087] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A compression device, characterized in that, Comprising: A compressor, including 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; A liquid storage mechanism, having 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 the 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 first compression cylinder is communicated with the first exhaust port through the receiving cavity. 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; An oil separation mechanism, including an oil-gas separator and a switching device. The oil-gas separator is disposed outside the housing. The oil-gas separator has an oil-gas inlet, an oil outlet and a gas outlet. The oil-gas inlet is communicated with the second exhaust port. The oil outlet is communicated with the receiving cavity and the oil return section respectively through 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.

2. The compression device according to claim 1, wherein, The switching device includes a switching assembly, an oil return connecting pipe, a first oil return pipe and a second oil return pipe. The switching assembly has a first interface, a second interface and a third interface that are communicated with each other. The first interface is communicated with the receiving cavity through the first oil return pipe. The second interface is communicated with the oil return section through the second oil return pipe. The third interface is communicated with the oil outlet through the oil return connecting pipe. The switching assembly is used to control the on-off of the oil outlet and the receiving cavity and / or the oil return section.

3. The compression device according to 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 the first liquid storage cavity. The outlet of the first liquid storage cavity is communicated with the inlet of the first compression cylinder through the first liquid storage connecting pipe. The second oil return pipe is communicated with at least one of the inlet of the first liquid storage cavity, the interior of the first liquid storage cavity, the outlet of the first liquid storage cavity, the first liquid storage connecting pipe and the inlet of the first compression cylinder.

4. The compression device according to claim 2, wherein The switching assembly includes a pipe joint, a first valve body and a second valve body. The pipe joint has the first interface, the second interface and the third interface. The first valve body is disposed on the first oil return pipe. The second valve body is disposed on the second oil return pipe.

5. The compression device according to 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 according to claim 4, wherein The first valve body is a check valve, and the check valve is configured to conduct unidirectionally from the first interface to the receiving cavity.

7. The compression device according to claim 2, wherein The switching assembly includes a switching valve. The switching valve has the first interface, the second interface and the third interface. The switching valve is used to control the oil flowing into the oil return connecting pipe to flow along the first oil return pipe and / or the second oil return pipe.

8. The compression device according to claim 7, characterized in that The switching valve is a three-way valve. The first interface of the three-way valve is communicated with the first oil return pipe. The second interface of the three-way valve is communicated with the second oil return pipe. The third interface of the three-way valve is communicated with the oil return connecting pipe.

9. The compression device according to claim 1, characterized in that, The liquid storage mechanism includes a first liquid storage device, a second liquid storage device, a first liquid storage connecting pipe, and a second liquid storage connecting pipe. The first liquid storage device has the first liquid storage chamber. The first liquid storage device is communicated with the inlet of the first compression cylinder through the first liquid storage connecting pipe. The second liquid storage device has the second liquid storage chamber. The second liquid storage device is communicated with the inlet of the second compression cylinder through the second liquid storage connecting pipe; and / or, the compressor is a double-suction double-row compressor.

10. A heat exchange system, characterized in that, It includes the compression device according to any one of claims 1 to 9.

11. The heat exchange system according to claim 10, wherein The heat exchange system further includes a detection component and a control device. The control device is 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 include at least one of the suction pressure, suction temperature, discharge pressure, and discharge temperature; The control device is used to control the compression device to enter the 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 accommodation chamber, and also controls the switching device to conduct the oil outlet to the oil return section, so that the oil discharged from the oil-gas separator flows back to the oil return section.

12. The heat exchange system according to claim 11, wherein, The control device is further used to control the compression device to enter the second working mode when the operating parameters of the compressor are within the preset parameter 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; In the second working mode, the control device controls the switching device to disconnect the oil outlet from the accommodation chamber, and also controls the switching device to conduct the oil outlet to the oil return section, so that the oil discharged from the oil-gas separator flows back to the oil return section.

13. The heat exchange system according to claim 11, characterized in that, The control device is further used to control the compression device to enter the third working mode when the operating parameters of the compressor are within the preset parameter range and the discharge pressure at the outlet of the second compression cylinder is greater than the discharge pressure at the outlet of the first compression cylinder; In the third working 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 conduct the oil outlet to the accommodation chamber, so that the oil discharged from the oil-gas separator flows back to the accommodation chamber.

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