Oil and gas separator and heat exchange system

Abstract

The application provides an oil-gas separator and a heat exchange system. The oil-gas separator comprises a shell, an oil outlet pipe, a gas outlet pipe and an air inlet pipe system connected with the shell, wherein the air inlet pipe system comprises at least two air inlets and at least two air outlets; when the air inlet pipe system is in a working state, the air inlet pipe system introduces fluid through the at least one air inlet and discharges the fluid through the at least one air outlet; when the pressure and / or flow rate of the fluid introduced into the air inlet pipe system through the air inlets changes, the number of the air outlets through which the air inlet pipe system discharges the fluid changes. The application solves the problem that the oil-gas separator in the prior art has poor adaptability to different displacement compressors.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment, and more specifically, to an oil-gas separator and a heat exchange system. Background Technology

[0002] The oil separation principle of a vertical oil-gas separator is as follows: After the compressor exhaust enters the oil-gas separator at high speed, the gas flow direction is changed through relevant measures to tangentially scour the inner wall of the separator. Centrifugal force is used to separate the lubricating oil, which flows down the inner wall of the cylinder, while the gas enters the system through the top outlet pipe. Generally, the airflow velocity in the inlet pipe is 10–25 m / s, and the airflow velocity through the cylinder should not exceed 0.3 m / s. The ratio of oil separation height to oil separation diameter is approximately 3.6. When the gas flow velocity in the oil-gas separator's inlet pipe decreases, it may cause insufficient centrifugal force and a decrease in oil separation efficiency.

[0003] The relevant patent application 202110944696.3 describes a refrigerant recovery system used for online testing. However, during operation, the refrigerant flow direction of the low-pressure refrigerant intake from the recovery compressor passing through the first oil-gas separator is opposite to that of a conventional oil-gas separator. This results in inefficient oil separation, and the lubricating oil remaining in the outdoor unit is more likely to enter the recovery compressor, causing lubricant contamination and affecting the amount of lubricating oil in the recovery compressor. Another problem with patent 202110944696.3 is that the recovery compressor typically uses a small-capacity compressor for refrigerant recovery, thus reducing the refrigerant flow rate during recovery. This decreases the refrigerant velocity passing through the oil-gas separator, failing to meet the separation speed requirements of larger-scale oil-gas separators, resulting in poor oil separation.

[0004] Therefore, existing technologies suffer from poor adaptability of oil-gas separators to compressors of different displacements. Summary of the Invention

[0005] The main objective of this invention is to provide an oil-gas separator and heat exchange system to solve the problem of poor adaptability of oil-gas separators to compressors of different displacements in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, an oil-gas separator is provided, comprising a housing and an oil outlet pipe, a gas outlet pipe, and an air inlet pipe system connected to the housing, wherein the air inlet pipe system includes: at least two air inlets; at least two exhaust ports; when the air inlet pipe system is in operation, the air inlet pipe system introduces fluid through at least one air inlet and discharges fluid through at least one exhaust port; when the pressure and / or flow rate of the fluid introduced into the air inlet pipe system changes, the number of exhaust ports through which the air inlet pipe system discharges fluid changes.

[0007] Furthermore, when the pressure and / or flow rate of the fluid introduced into the intake piping system through the intake port increases, the number of exhaust ports through which the fluid is discharged from the intake piping increases.

[0008] Furthermore, there are two air inlets, namely a first air inlet and a second air inlet. When fluid is introduced through the second air inlet, the fluid is discharged through the exhaust port corresponding to the second air inlet. When fluid is introduced through the first air inlet, if the pressure and / or flow rate of the fluid does not exceed a preset value, the fluid is discharged through the exhaust port corresponding to the first air inlet. When fluid is introduced through the first air inlet, if the pressure and / or flow rate of the fluid exceeds a preset value, the fluid is discharged through the exhaust ports corresponding to the first air inlet and the exhaust ports corresponding to the second air inlet.

[0009] Furthermore, the intake piping system also includes an on / off switching structure, which changes position to connect the exhaust ports corresponding to the first intake port and the second intake port, or to isolate the exhaust ports corresponding to the first intake port and the second intake port. The on / off switching structure changes position when the fluid pressure and / or flow rate exceeds a preset value.

[0010] Furthermore, there are two air inlets, namely a first air inlet and a second air inlet, and two exhaust outlets, namely a first exhaust outlet and a second exhaust outlet. The air intake pipeline system also includes: an external pipeline having a first air inlet, a second air inlet, and a first exhaust outlet; and an internal pipeline, at least a portion of which is located inside the external pipeline, and the internal pipeline having a second exhaust outlet. Fluid entering the external pipeline through the second air inlet can enter the internal pipeline through a third air inlet at the end of the internal pipeline away from the second exhaust outlet.

[0011] Furthermore, the diameter of the first air inlet is greater than or equal to the diameter of the second air inlet; the diameters of both the first and second air inlets are greater than the diameter of the third air inlet.

[0012] Furthermore, the end of the internal pipe with the second vent extends from the first vent; or the end of the internal pipe with the second vent is flush with the first vent.

[0013] Furthermore, the external pipeline includes a main pipeline and a first branch and a second branch respectively connected to the main pipeline. The main pipeline, the first branch and the second branch form a three-way pipeline structure. The end of the main pipeline away from the first branch has a first exhaust port, the end of the first branch away from the main pipeline has a first air inlet, and the end of the second branch away from the main pipeline has a second air inlet.

[0014] Furthermore, the end of the internal pipeline with the second exhaust port is located inside the main pipeline, and the end of the internal pipeline with the third air inlet is located inside the second branch pipeline.

[0015] Furthermore, the intake piping system also includes an on / off switching structure, which is movably disposed inside the second branch. When the pressure and / or flow rate of the fluid introduced into the first intake port exceeds a preset value, the on / off switching structure moves in a direction close to the second intake port. At least a portion of the fluid introduced into the first intake port is discharged from the first exhaust port, and at least another portion of the fluid introduced into the first intake port enters the internal piping through the third intake port and is discharged from the second exhaust port.

[0016] Furthermore, the second branch extends vertically. When the pressure and / or flow rate of the fluid introduced into the first air inlet does not exceed the preset value, or when the air intake pipeline system does not introduce fluid through the first air inlet, or when fluid is introduced through the second air inlet, the on / off switching structure is sleeved on the end of the internal pipeline near the third air inlet to isolate the first air inlet and the second air inlet.

[0017] Furthermore, the second branch extends vertically, and the on / off switching structure includes a slip ring. The slip ring has a clearance hole that cooperates with the internal pipeline so that the slip ring is fitted onto the end of the internal pipeline near the third air inlet. The internal pipeline is provided with a variable diameter section below the slip ring, and the diameter of the variable diameter section is larger than the diameter of the clearance hole.

[0018] Furthermore, the external pipeline also includes multiple positioning rings, and the end of the internal pipeline with the second vent is fitted with at least one positioning ring, which abuts against the inner wall of the main pipeline; the end of the variable diameter section away from the slip ring is fitted with at least one positioning ring, which abuts against the inner wall of the second branch.

[0019] Furthermore, the positioning ring includes: an inner ring, which is fitted onto the internal pipeline; an outer ring, the diameter of which is larger than that of the inner ring and abuts against the inner wall of the main pipeline or the second branch pipeline; and connecting ribs, of which there are multiple connecting ribs, with both ends of the connecting ribs connected to the inner ring and the outer ring respectively.

[0020] Furthermore, the internal pipeline has a bend section corresponding to the positioning ring, and the positioning ring is fitted onto the bend section.

[0021] Furthermore, the intake piping system also includes a one-way valve, which is located at the end of the second branch with the second intake port.

[0022] According to another aspect of the present invention, a heat exchange system is provided, including the oil-gas separator described above.

[0023] Furthermore, the heat exchange system also includes: a first compressor; a second compressor, the first compressor and the second compressor having different discharge capacities, and the first compressor and the second compressor being connected to different air inlets of the oil-gas separator respectively.

[0024] Applying the technical solution of the present invention, the oil-gas separator in this application includes a housing and an oil outlet pipe, an air outlet pipe, and an air inlet pipe system connected to the housing. The air inlet pipe system includes at least two air inlets and at least two air outlets. When the air inlet pipe system is in operation, the air inlet pipe system introduces fluid through at least one air inlet and discharges fluid through at least one air outlet. When the pressure and / or flow rate of the fluid introduced into the air inlet pipe system changes, the number of air outlets through which the air inlet pipe system discharges fluid changes.

[0025] When using the oil-gas separator of this application, different inlet ports can be selected to connect to different compressors when compressors of different displacements are connected to the oil-gas separator. Furthermore, as the compressor displacement increases, the flow rate and pressure of the fluid through the corresponding inlet port increase, and the number of exhaust ports through which the fluid is discharged from the intake pipeline system changes. This alters the velocity of the fluid discharged from the intake pipeline system, thereby ensuring the velocity of the fluid entering the oil-gas separator housing and guaranteeing the separation effect of the oil-gas separator. Therefore, the oil-gas separator of this application effectively solves the problem of poor adaptability of existing oil-gas separators to compressors of different displacements. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A schematic diagram of an oil-gas separator according to a specific embodiment of the present invention is shown, in which fluid is introduced through a first air inlet and discharged through a first exhaust port and a second exhaust port.

[0028] Figure 2 A schematic diagram of the structure of an oil-gas separator according to a specific embodiment of the invention is shown, in which fluid is introduced through a second air inlet and discharged through a second exhaust outlet.

[0029] Figure 3 A schematic diagram of the slip ring structure of an oil-gas separator according to a specific embodiment of the present invention is shown;

[0030] Figure 4 A schematic diagram of the positioning ring of an oil-gas separator according to a specific embodiment of the present invention is shown;

[0031] Figure 5 A schematic diagram of a heat exchange system according to a specific embodiment of the present invention is shown.

[0032] The above figures include the following reference numerals:

[0033] 10. Housing; 20. Oil outlet pipe; 30. Air outlet pipe; 40. Air intake piping system; 50. First air intake port; 60. Second air intake port; 70. On / off switching structure; 71. Slip ring; 711. Clearance hole; 80. First exhaust port; 90. Second exhaust port; 100. External piping; 110. Main pipe; 120. First branch pipe; 130. Second branch pipe; 140. Positioning ring; 141. Inner ring; 142. Outer ring; 143. Connecting rib; 200. Internal piping; 210. Third air intake port; 220. Variable diameter section; 230. Bend section; 300. One-way valve; 400. First compressor; 500. Second compressor. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0036] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0037] To address the problem of poor adaptability of existing oil-gas separators to compressors of different displacements, this application provides an oil-gas separator and heat exchange system.

[0038] Furthermore, the heat exchange system in this application includes the oil-gas separator described below.

[0039] like Figures 1 to 4 As shown, the oil-gas separator in this application includes a housing 10 and an oil outlet pipe 20, an air outlet pipe 30, and an air inlet system 40 connected to the housing 10. The air inlet system 40 includes at least two air inlets and at least two air outlets. When the air inlet system 40 is in operation, fluid is introduced into the air inlet system 40 through at least one air inlet and discharged through at least one air outlet. When the pressure and / or flow rate of the fluid introduced into the air inlet system 40 through the air inlet changes, the number of air outlets through which the air inlet system 40 discharges fluid changes.

[0040] When using the oil-gas separator of this application, different inlet ports can be selected to connect to different compressors when compressors of different displacements are connected to the oil-gas separator. Furthermore, as the compressor displacement increases, the flow rate and pressure of the fluid through the corresponding inlet port increase, and the number of exhaust ports through which the fluid is discharged from the intake pipeline system 40 changes. This alters the velocity of the fluid discharged from the intake pipeline system 40, thereby ensuring the velocity of the fluid entering the housing 10 of the oil-gas separator and guaranteeing the separation effect of the oil-gas separator. Therefore, the oil-gas separator of this application effectively solves the problem of poor adaptability of existing oil-gas separators to compressors of different displacements.

[0041] It should be noted that the oil-gas separator in this application can be a vertical centrifugal oil-gas separator.

[0042] In other words, the oil-gas separator in this application solves the problem that when a large-displacement compressor and a small-displacement compressor share a vertical centrifugal oil-gas separator, the oil separation effect is poor due to the decrease in the refrigerant gas inlet flow rate when the small-displacement compressor runs alone.

[0043] At the same time, such as Figure 5 As shown, the heat exchange system in this application also includes a first compressor 400 and a second compressor 500. The first compressor 400 and the second compressor 500 have different discharge capacities, and the first compressor 400 and the second compressor 500 are respectively connected to different air inlets of the oil-gas separator.

[0044] Specifically, when the pressure and / or flow rate of the fluid introduced into the intake pipe system 40 through the intake port increases, the number of exhaust ports through which the fluid exits the intake pipe increases. This configuration effectively ensures the flow rate of the fluid entering the oil-gas separator, thereby preventing excessive fluid velocity and ensuring the effectiveness of the oil-gas separator.

[0045] Specifically, there are two air inlets, namely the first air inlet 50 and the second air inlet 60, and the fluid flow within the air intake piping system 40 is mainly divided into three types:

[0046] The first type is when fluid is introduced into the second air inlet 60, the fluid is discharged from the exhaust port corresponding to the second air inlet 60.

[0047] The second scenario is that when fluid is introduced into the first air inlet 50, if the pressure and / or flow rate of the fluid does not exceed a preset value, the fluid is discharged from the exhaust port corresponding to the first air inlet 50.

[0048] The third type is that when fluid is introduced into the first air inlet 50, if the pressure and / or flow rate of the fluid exceeds a preset value, the fluid is discharged from the exhaust port corresponding to the first air inlet 50 and the exhaust port corresponding to the second air inlet 60.

[0049] In other words, in this application, the compressor with the larger displacement can be connected to the first air inlet 50, while the compressor with the smaller displacement can be connected to the second air inlet 60.

[0050] Specifically, the intake piping system 40 also includes an on / off switching structure 70, which changes position to connect the exhaust ports corresponding to the first intake port 50 and the second intake port 60, or to isolate the exhaust ports corresponding to the first intake port 50 and the second intake port 60. The on / off switching structure 70 changes position when the pressure and / or flow rate of the fluid exceeds a preset value.

[0051] In one specific embodiment of this application, there are two air inlets, namely a first air inlet 50 and a second air inlet 60, and two exhaust outlets, namely a first exhaust outlet 80 and a second exhaust outlet 90. The air intake pipeline system 40 also includes an external pipeline 100 and an internal pipeline 200. The external pipeline 100 has a first air inlet 50, a second air inlet 60 and a first exhaust outlet 80. At least a portion of the internal pipeline 200 is located inside the external pipeline 100, and the internal pipeline 200 has a second exhaust outlet 90. Fluid entering the external pipeline 100 from the second air inlet 60 can enter the internal pipeline 200 through a third air inlet 210 at the end of the internal pipeline 200 away from the second exhaust outlet 90. Furthermore, the on / off switching structure 70 of the intake piping system 40 is movably disposed inside the second branch 130. When the pressure and / or flow rate of the fluid introduced through the first intake port 50 exceeds a preset value, the on / off switching structure 70 moves in a direction closer to the second intake port 60. At least a portion of the fluid introduced through the first intake port 50 is discharged through the first exhaust port 80, and at least another portion of the fluid introduced through the first intake port 50 enters the internal piping 200 through the third intake port 210 and is discharged through the second exhaust port 90. That is to say, in this embodiment, for a large-displacement compressor, it can be connected to the first intake port 50, while for a small-displacement compressor, it can be connected to the second intake port 60.

[0052] Optionally, the diameter of the first air inlet 50 is greater than or equal to the diameter of the second air inlet 60; both the diameters of the first air inlet 50 and the second air inlet 60 are larger than the diameter of the third air inlet 210. Since the small-displacement compressor is connected to the second air inlet 60, designing the diameter of the third air inlet 210 to be smaller can effectively ensure that the velocity of the fluid discharged from the small-displacement compressor when entering the oil-gas separator meets the separation velocity of the oil-gas separator, thereby ensuring the separation effect of the oil-gas separator.

[0053] Optionally, one end of the internal pipe 200 having the second exhaust port 90 extends from the first exhaust port 80, or the end of the internal pipe 200 having the second exhaust port 90 is flush with the first exhaust port 80.

[0054] Optionally, the external pipeline 100 includes a main pipeline 110 and a first branch 120 and a second branch 130 respectively connected to the main pipeline 110. The main pipeline 110, the first branch 120, and the second branch 130 form a T-junction pipeline structure. The end of the main pipeline 110 away from the first branch 120 has a first exhaust port 80, the end of the first branch 120 away from the main pipeline 110 has a first air inlet 50, and the end of the second branch 130 away from the main pipeline 110 has a second air inlet 60. That is to say, in the actual manufacturing process, the T-junction can be modified to serve as the external pipeline 100 in this application. It should be noted that other pipelines need to be appropriately connected at the ports of the T-junction to ensure the sealing performance and usability of the external pipeline 100.

[0055] Optionally, one end of the internal pipe 200 having a second exhaust port 90 is located inside the main pipe 110, and one end of the internal pipe 200 having a third air inlet 210 is located inside the second branch pipe 130.

[0056] Specifically, the second branch 130 extends vertically. When the pressure and / or flow rate of the fluid introduced into the first air inlet 50 does not exceed a preset value, or when the air intake pipeline system 40 does not introduce fluid through the first air inlet 50, or when fluid is introduced through the second air inlet 60, the on / off switching structure 70 is fitted onto the end of the internal pipeline 200 near the third air inlet 210 to isolate the first air inlet 50 and the second air inlet 60. Furthermore, the second branch 130 extends vertically, and the on / off switching structure 70 includes a slip ring 71. The slip ring 71 has a clearance hole 711 that mates with the internal pipeline 200, so that the slip ring 71 is fitted onto the end of the internal pipeline 200 near the third air inlet 210. A reducing section 220 is provided below the slip ring 71 in the internal pipeline 200, and the diameter of the reducing section 220 is larger than the diameter of the clearance hole 711.

[0057] In practical use, when a large-displacement compressor is running, the high-pressure refrigerant gas from the exhaust pipe enters through the first inlet 50 and can push upwards to open the slip ring 71. The refrigerant can then flow into the oil-gas separator from the space between the external pipe 100 and the internal pipe 200, and from inside the internal pipe 200. When a small-displacement compressor is running, the slip ring 71, under the influence of gravity and the impact of the refrigerant, is stuck on the reducing section 220 of the internal pipe 200, preventing the refrigerant gas from passing through the slip ring 71 and allowing it to flow only into the oil-gas separator through the smaller diameter internal pipe 200. The refrigerant flow rate in the smaller diameter internal pipe 200 meets the original design flow rate of the oil-gas separator, thus achieving efficient oil separation and overcoming the shortcomings of existing technologies. Therefore, the oil-gas separator in this application can be connected and used with a conventional oil-gas separator, eliminating the need for a specially designed oil-gas separator with multiple inlet pipes.

[0058] Specifically, the external pipeline 100 further includes multiple positioning rings 140. At least one positioning ring 140 is fitted onto one end of the internal pipeline 200 having the second exhaust port 90, and the positioning ring 140 abuts against the inner wall of the main pipeline 110. At least one positioning ring 140 is fitted onto the end of the variable diameter section 220 away from the slip ring 71, and the positioning ring 140 abuts against the inner wall of the second branch 130. The positioning ring 140 includes: an inner ring 141 fitted onto the internal pipeline 200; an outer ring 142, the diameter of which is larger than the diameter of the inner ring 141 and abuts against the inner wall of the main pipeline 110 or the second branch 130; and multiple connecting ribs 143, with both ends of each connecting rib connected to the inner ring 141 and the outer ring 142, respectively.

[0059] Furthermore, in this application, multiple vent holes are formed between the inner ring 141, the outer ring 142, and the connecting rib 143 to allow refrigerant to pass through. The inner ring 141 of the positioning ring 140 forms an interference fit with the outer wall of the internal pipe 200. The slip ring 71 can form a clearance fit with both the external pipe 100 and the internal pipe 200, which is beneficial for free sliding.

[0060] Optionally, the internal pipeline 200 is provided with a bend section 230 corresponding to the positioning ring 140, and the positioning ring 140 is fitted onto the bend portion of the bend section 230. It should be noted that in this application, the external pipeline 100 is also provided with a corresponding bend section corresponding to the bend section 230 of the internal pipeline 200, so as to ensure that the portions of the internal pipeline 200 and the external pipeline 100 extending into the housing 10 can be parallel or approximately parallel to each other. At the same time, the bend section 230 provided in this application can also effectively limit the velocity direction of the fluid entering the housing 10 for oil-gas separation, thereby ensuring the separation effect of the oil-gas separator.

[0061] Specifically, the intake piping system 40 also includes a one-way valve 300, which is located at the end of the second branch 130 that has the second intake port 60. It should be noted that in one specific embodiment of this application, the first intake port 50 and the second intake port 60 are not used simultaneously and are not vented with fluid. Similarly, a one-way valve 300 can also be installed in the first branch 120 corresponding to the position of the first intake port 50. Furthermore, when fluid is vented into the first intake port 50, the one-way valve 300 corresponding to the second branch 130 is closed, thereby ensuring that fluid does not flow back through the second intake port 60.

[0062] Therefore, the oil-gas separator in this application ensures refrigerant recovery while preventing lubricating oil from the refrigeration equipment from entering the recovery system and causing lubricating oil mixing, which would affect the operational reliability of the compressor in the recovery system. Furthermore, the oil-gas separator in this application demonstrates how to configure different oil-gas separator inlet pipes when the same oil-gas separator is used with compressors of different specifications.

[0063] The vertical centrifugal oil-gas separator in this application includes at least a housing 10, an inlet pipeline system 40, an outlet pipe 30, and an oil outlet pipe 20. It may also have a gas guide to improve the gas swirling effect. The refrigerant gas enters the oil-gas separator housing 10 from the inlet pipeline system 40 and turns, so that the refrigerant enters the oil-gas separator at high speed and then flows out tangentially and sprays onto the inner wall of the oil-gas separator. The refrigerant gas carries lubricating oil droplets and rotates inside the housing 10. Under the action of centrifugal force, the lubricating oil droplets adhere to the inner wall of the housing 10 and flow downward. After rotating downward, the refrigerant gas turns back upward and flows upward from the center. Finally, the refrigerant gas flows out from the central outlet pipe 30. The outlet pipe 20 located inside the oil-gas separator housing 10 is generally higher than the bottom by a certain distance. The main purpose is to prevent impurities trapped inside the oil-gas separator from clogging the outlet pipe 20 and the subsequent return oil line. The other outlet pipe 20 can be led out from any position of the housing 10 to the outside of the housing 10 to facilitate the connection of the return oil line.

[0064] like Figure 1 and Figure 2 As shown in a specific embodiment of this application, the external pipeline 100 mainly includes a vertical return pipe, a horizontal exhaust pipe, a tee, and an intake pipe. The return pipe is connected to the upper vertical port of the tee, and the exhaust pipe is connected to the horizontal port of the tee. A one-way valve 300 is installed on the return pipe, and the one-way valve 300 can be replaced by a solenoid valve or other valve. A solenoid valve or a one-way valve 300 can also be installed on the exhaust pipe. The return pipe has a small-diameter internal pipeline 200.

[0065] Preferably, the internal pipe 200 is an assembly, with the upper straight section with a variable diameter section 220 being a rigid pipe and the lower bendable section being a flexible hose. The flexible hose is sleeved at the lower outlet of the rigid pipe and fixed by clamps or heat shrink tubing. It should be noted that the use of heat shrink tubing to fix the flexible hose is only a preferred embodiment and is not a limitation on the fixing method. Other fixing methods such as pipe clamps and wire ties can also be used.

[0066] In one specific embodiment of this application, the displacement of the first compressor 400 is greater than that of the second compressor 500. The larger displacement compressor referred to below is the first compressor 400, and the smaller displacement compressor is the second compressor 500. The working principle of the heat exchange system is as follows:

[0067] The high-temperature, high-pressure refrigerant exhaust from the large-displacement compressor enters the tee of the external pipeline 100 through the exhaust pipe. Most of the high-pressure refrigerant gas enters the oil-gas separator through the gap between the external pipeline 100 and the internal pipeline 200. At the same time, the remaining high-pressure refrigerant gas passes through the vent hole of the upper positioning ring 140 and pushes open the slip ring 71, causing the slip ring 71 to move upward and separate from the internal pipeline 200. This part of the high-pressure refrigerant cannot flow backward through the one-way valve 300 or the closed solenoid valve, so it can only flow into the oil-gas separator from the internal pipeline 200. This ensures that the large-displacement compressor makes full use of the flow area of ​​the internal pipeline 200. After the high-temperature, high-pressure refrigerant gas achieves efficient oil separation inside the oil-gas separator, it enters the condenser from the outlet pipe 30.

[0068] When a large-displacement compressor operates at low speed using variable frequency, the flow rate and pressure of the refrigerant gas it discharges will decrease, which is insufficient to push the slip ring 71 upward. As a result, the refrigerant gas can only pass through the gap between the external pipe 100 and the internal pipe 200 before entering the oil-gas separator. This is equivalent to a reduction in the flow area, so the refrigerant gas flow rate entering the oil-gas separator can still be maintained at a high speed, thus achieving high-efficiency oil separation.

[0069] When the large-displacement compressor stops running or the solenoid valve on the discharge pipe connected to the large-displacement compressor is closed, the large-displacement compressor itself is equivalent to a closed valve, and refrigerant cannot flow from the closed large-displacement compressor. Because the large-displacement compressor is closed, the refrigerant pressure in the second branch 130 will drop, and the slip ring 71 will move down again under the action of gravity and fit onto the internal pipe 200 and be stuck by its reducing section 220. When the small-displacement compressor starts running, it recovers the refrigerant from the outdoor unit, so that the refrigerant is stored inside the evaporator of the indoor unit. At this time, the refrigerant flow rate and velocity of the small-displacement compressor are relatively small. The low-pressure refrigerant gas returning from the condenser of the outdoor unit enters the external pipe 100 through the second air inlet 60 and impacts the slip ring 71. Under the impact of gravity and the refrigerant gas, the slip ring 71 is pressed tightly onto the reducing section 220 of the internal pipe 200, thereby blocking and sealing the gap between the internal pipe 200 and the external pipe 100. Preferably, the contact surfaces of the slip ring 71 and the reducing section 220 of the internal pipe 200 are matched, such as with a conical surface or a spherical surface, thereby achieving a better sealing effect. Therefore, refrigerant gas can only enter through the internal pipe 200. Because the internal pipe 200 has a relatively small diameter, it also allows a small flow rate of refrigerant to flow at high speed, thus achieving high-efficiency oil separation.

[0070] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0071] 1. Effectively solves the problem of poor adaptability of oil-gas separators to compressors of different displacements in existing technologies;

[0072] 2. Simple structure and stable performance.

[0073] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0074] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0075] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil-gas separator, characterized in that, It includes a housing (10) and an oil outlet pipe (20), an air outlet pipe (30), and an air intake pipe system (40) connected to the housing (10), wherein the air intake pipe system (40) includes: At least two air intakes; At least two exhaust ports; When the intake pipeline system (40) is in operation, the intake pipeline system (40) introduces fluid through at least one of the intake ports and discharges fluid through at least one of the exhaust ports. When the pressure and / or flow rate of the fluid introduced into the intake pipeline system (40) through the intake ports changes, the number of exhaust ports through which the intake pipeline system (40) discharges fluid changes. When the pressure and / or flow rate of the fluid introduced into the intake pipe system (40) through the intake port increases, the number of exhaust ports through which the fluid is discharged from the intake pipe increases. The air inlets are two, namely the first air inlet (50) and the second air inlet (60). When the fluid is introduced through the second air inlet (60), the fluid is discharged through the exhaust port corresponding to the second air inlet (60); When the fluid is introduced through the first air inlet (50), if the pressure and / or flow rate of the fluid does not exceed a preset value, the fluid is discharged from the exhaust port corresponding to the first air inlet (50); When the fluid is introduced through the first air inlet (50), when the pressure and / or flow rate of the fluid exceeds a preset value, the fluid is discharged from the exhaust port corresponding to the first air inlet (50) and the exhaust port corresponding to the second air inlet (60).

2. The oil-gas separator according to claim 1, characterized in that, The intake piping system (40) further includes an on / off switching structure (70), which changes position to enable the first intake port (50) to connect with the exhaust port corresponding to the second intake port (60), or to isolate the first intake port (50) from the exhaust port corresponding to the second intake port (60). The on / off switching structure (70) changes position when the pressure and / or flow rate of the fluid exceeds a preset value.

3. The oil-gas separator according to claim 1, characterized in that, The air inlets are two, namely a first air inlet (50) and a second air inlet (60), and the exhaust ports are two, namely a first exhaust port (80) and a second exhaust port (90). The air intake pipeline system (40) further includes: An external pipeline (100) having a first air inlet (50), a second air inlet (60) and a first exhaust outlet (80); An internal conduit (200) is provided, at least a portion of which is located inside the external conduit (100), and the internal conduit (200) has a second exhaust port (90), and fluid entering the external conduit (100) from the second air inlet (60) can enter the internal conduit (200) through a third air inlet (210) at one end of the internal conduit (200) away from the second exhaust port (90).

4. The oil-gas separator according to claim 3, characterized in that, The diameter of the first air inlet (50) is greater than or equal to the diameter of the second air inlet (60); The diameter of the first air inlet (50) and the diameter of the second air inlet (60) are both larger than the diameter of the third air inlet (210).

5. The oil-gas separator according to claim 3, characterized in that, The internal conduit (200) has one end with the second exhaust port (90) extending from the first exhaust port (80); or The internal pipeline (200) has one end of the second exhaust port (90) flush with the first exhaust port (80).

6. The oil-gas separator according to claim 3, characterized in that, The external pipeline (100) includes a main pipeline (110) and a first branch (120) and a second branch (130) respectively connected to the main pipeline (110). The main pipeline (110), the first branch (120) and the second branch (130) form a three-way pipeline structure. The end of the main pipeline (110) away from the first branch (120) has a first exhaust port (80), the end of the first branch (120) away from the main pipeline (110) has a first air inlet (50), and the end of the second branch (130) away from the main pipeline (110) has a second air inlet (60).

7. The oil-gas separator according to claim 6, characterized in that, The internal pipe (200) has one end with the second exhaust port (90) located inside the main pipe (110), and the internal pipe (200) has one end with the third air inlet (210) located inside the second branch pipe (130).

8. The oil-gas separator according to claim 6, characterized in that, The intake piping system (40) further includes an on / off switching structure (70), which is movably disposed inside the second branch (130). When the pressure and / or flow rate of the fluid introduced through the first intake port (50) exceeds a preset value, the on / off switching structure (70) moves in a direction close to the second intake port (60), at least a portion of the fluid introduced through the first intake port (50) is discharged through the first exhaust port (80), and at least another portion of the fluid introduced through the first intake port (50) enters the internal piping (200) through the third intake port (210) and is discharged through the second exhaust port (90).

9. The oil-gas separator according to claim 8, characterized in that, The second branch (130) extends vertically. When the pressure and / or flow rate of the fluid introduced into the first air inlet (50) does not exceed a preset value, or when the air intake pipeline system (40) does not introduce fluid through the first air inlet (50), or when the fluid is introduced through the second air inlet (60), the on / off switching structure (70) is sleeved on the end of the internal pipeline (200) near the third air inlet (210) to isolate the first air inlet (50) and the second air inlet (60).

10. The oil-gas separator according to claim 8, characterized in that, The second branch (130) extends vertically, and the on / off switching structure (70) includes a slip ring (71). The slip ring (71) has a clearance hole (711) that cooperates with the internal pipeline (200) so that the slip ring (71) is sleeved on the end of the internal pipeline (200) near the third air inlet (210). The internal pipeline (200) is provided with a variable diameter section (220) below the slip ring (71), and the diameter of the variable diameter section (220) is larger than the diameter of the clearance hole (711).

11. The oil-gas separator according to claim 10, characterized in that, The external pipeline (100) also includes multiple positioning rings (140). The internal pipeline (200) has at least one of the positioning rings (140) fitted at one end of the second exhaust port (90), and the positioning ring (140) abuts against the inner wall of the main pipeline (110). At least one positioning ring (140) is fitted at the end of the variable diameter section (220) away from the slip ring (71), and the positioning ring (140) abuts against the inner wall of the second branch (130).

12. The oil-gas separator according to claim 11, characterized in that, The positioning ring (140) includes: Inner ring (141), the inner ring (141) is sleeved on the internal pipeline (200); Outer ring (142), the diameter of which is greater than that of the inner ring (141) and abuts against the inner wall of the main road (110) or the second branch road (130); Connecting ribs (143), there are multiple connecting ribs (143), and the two ends of the connecting ribs (143) are respectively connected to the inner ring (141) and the outer ring (142).

13. The oil-gas separator according to claim 11, characterized in that, The internal pipeline (200) is provided with a bent section (230) corresponding to the positioning ring (140), and the positioning ring (140) is sleeved on the bent part of the bent section (230).

14. The oil-gas separator according to any one of claims 6 to 13, characterized in that, The intake piping system (40) also includes a one-way valve (300), which is located at one end of the second branch (130) having the second intake port (60).

15. A heat exchange system, characterized in that, Includes the oil-gas separator according to any one of claims 1 to 14.

16. The heat exchange system according to claim 15, characterized in that, The heat exchange system also includes: First compressor (400); The second compressor (500) has a different discharge capacity than the first compressor (400) and the second compressor (500), and the first compressor (400) and the second compressor (500) are respectively connected to different air inlets of the oil-gas separator.

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