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 is used to introduce fluid through the at least two air inlets and discharge the fluid through the at least two air outlets; and when the air inlet pipe system is used to introduce fluid through different air inlets, the fluid passes through fluid channels with different flow areas. The application solves the problem of poor adaptability of the oil-gas separator to different displacement compressors in the prior art.

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, and when the air inlet pipe system introduces fluid through different air inlets, the flow area of ​​the fluid passage through which the fluid passes is different.

[0007] Furthermore, when the intake piping system introduces fluid through different intake ports, the intake piping system exhausts fluid through at least one different exhaust port.

[0008] Furthermore, there are two air inlets, namely the first air inlet and the second air inlet, and multiple exhaust ports. 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, the fluid is discharged through multiple exhaust ports.

[0009] Furthermore, the diameter of the first air inlet is larger than the diameter of the second air inlet.

[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, which has a first air inlet and a first exhaust outlet; and an internal pipeline, at least a portion of which is located inside the external pipeline, and which has a second air inlet and a second exhaust outlet.

[0011] 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.

[0012] Furthermore, the internal pipeline includes: a delivery pipe having 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 forming a three-way pipeline structure, the end of the main pipeline away from the first branch having a second exhaust port, the end of the first branch away from the main pipeline having a second air inlet, and the end of the first branch with the second air inlet extending out of the external pipeline; a limiting member, at least a portion of which is closably disposed at the end of the second branch away from the main pipeline, and when the limiting member is open, the end of the second branch away from the main pipeline is internally connected to the external pipeline.

[0013] Furthermore, the end of the second branch away from the main branch extends toward the end of the external pipeline with the first air inlet; and / or the extension direction of the first branch and the extension direction of the second branch are perpendicular to each other.

[0014] Furthermore, the internal pipeline also includes multiple positioning rings. At least one positioning ring is fitted onto the end of the main pipeline with the second exhaust port and the end of the second branch pipeline away from the main pipeline, and the outer periphery of the positioning ring abuts against the inner wall of the external pipeline.

[0015] Furthermore, the positioning ring includes: an inner ring, which is fitted onto the main pipeline or the second branch pipeline; an outer ring, the diameter of which is larger than that of the inner ring and abuts against the inner wall of the external pipeline; and connecting ribs, which are multiple in number, with both ends of the connecting ribs connected to the inner ring and the outer ring respectively.

[0016] Furthermore, the second branch has a variable diameter section corresponding to the positioning ring, the positioning ring is sleeved on the end of the variable diameter section, and the diameter of the variable diameter section is larger than the diameter of the inner ring; and / or the main branch has a bent section corresponding to the positioning ring, the positioning ring is sleeved on the bent part of the bent section.

[0017] Furthermore, when fluid is introduced through the first air inlet, the limiting member can avoid the end of the second branch after being heated.

[0018] Furthermore, the limiting member includes: a deformable part, the first end of which is connected to the inner wall of the external pipeline, the second end of which extends toward the second branch, and the deformable part having an open position and a closed position; and a sealing part, which is connected to the second end of the deformable part and moves with the deformable part. When the deformable part is in the closed position, at least a portion of the sealing part covers the opening at the end of the second branch away from the main pipeline. When the deformable part is in the open position, the sealing part avoids at least a portion of the opening at the end of the second branch away from the main pipeline.

[0019] Furthermore, the sealing part includes a sealing ball, which is capable of covering or avoiding the opening at the end of the second branch away from the main branch; and / or the deformable part includes at least two stacked metal sheets, and the two metal sheets have different coefficients of expansion.

[0020] Furthermore, the intake piping system also includes a one-way valve, which is located at the end of the first branch with the second intake port.

[0021] According to another aspect of the present invention, a heat exchange system is provided, including the oil-gas separator described above.

[0022] 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.

[0023] 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 air inlet pipe system introduces fluid through different air inlets, the flow area of ​​the fluid passage through which the fluid passes is different.

[0024] When using the oil-gas separator of this application, because the fluid passes through different fluid channels with varying flow areas when the intake pipeline system is supplied with fluid through different intake ports, different intake ports can be selected to connect to different compressors when compressors of different displacements are connected to the oil-gas separator. This allows the fluid discharged from the large-displacement compressor to pass through the fluid channel with a large flow area, while the fluid discharged from the small-displacement compressor passes through the fluid channel with a small flow area. This changes the velocity of the fluid discharged from the intake pipeline system, thereby ensuring the velocity of the fluid entering the oil-gas separator shell 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

[0025] 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:

[0026] Figure 1 This illustration shows a schematic diagram of the structure of the oil-gas separator in a specific embodiment of this application when fluid is introduced through the first air inlet and the limiting member is open;

[0027] Figure 2 This illustration shows a schematic diagram of the structure of the oil-gas separator in a specific embodiment of this application when fluid is introduced through the second air inlet and the limiting element is closed;

[0028] Figure 3 A schematic diagram of the internal piping of an oil-gas separator in a specific embodiment of this application is shown;

[0029] Figure 4 A schematic diagram of the positioning ring of an oil-gas separator in a specific embodiment of this application is shown;

[0030] Figure 5 A schematic diagram of the heat exchange system in a specific embodiment of this application is shown.

[0031] The above figures include the following reference numerals:

[0032] 10. Housing; 20. Oil outlet pipe; 30. Air outlet pipe; 40. Air intake piping system; 50. First air inlet; 60. Second air inlet; 70. First exhaust port; 80. Second exhaust port; 90. External piping; 100. Internal piping; 110. Delivery pipe; 111. Main pipe; 1111. Bend section; 112. First branch; 113. Second branch; 1131. Variable diameter section; 120. Limiting element; 121. Deformation part; 122. Sealing part; 130. Positioning ring; 131. Inner ring; 132. Outer ring; 133. Connecting rib; 200. Check valve; 300. First compressor; 400. Second compressor. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] And, as Figure 5 As shown, the heat exchange system in this application includes the oil-gas separator described below.

[0038] 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 pipe system 40 connected to the housing 10. The air inlet pipe system 40 includes at least two air inlets and at least two air outlets. When the air inlet pipe system 40 is in operation, the air inlet pipe system 40 introduces fluid through at least one air inlet and discharges fluid through at least one air outlet. When the air inlet pipe system 40 introduces fluid through different air inlets, the flow area of ​​the fluid passage through which the fluid passes is different.

[0039] When using the oil-gas separator of this application, since the fluid passes through different fluid channels with different flow areas when the intake pipeline system 40 is supplied with fluid through different intake ports, different intake ports can be selected to connect to different compressors when compressors of different displacements are connected to the oil-gas separator. This allows the fluid discharged from the large-displacement compressor to pass through the fluid channel with a large flow area, while the fluid discharged from the small-displacement compressor passes through the fluid channel with a small flow area. This changes 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 ensuring the separation effect of the oil-gas separator. Therefore, the oil-gas separator of this application effectively solves the problem of poor adaptability of oil-gas separators to compressors of different displacements in the prior art.

[0040] It should be noted that the oil-gas separator in this application can be a vertical centrifugal oil-gas separator.

[0041] 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.

[0042] At the same time, such as Figure 5 As shown, the heat exchange system in this application also includes a first compressor 300 and a second compressor 400. The first compressor 300 and the second compressor 400 have different discharge capacities, and the first compressor 300 and the second compressor 400 are respectively connected to different air inlets of the oil-gas separator.

[0043] Specifically, when fluid is introduced into the intake piping system 40 through different intake ports, the intake piping system 40 exhausts fluid through at least one different exhaust port. This arrangement allows the fluid to be discharged through multiple exhaust ports as the flow rate of the fluid entering the intake piping system 40 increases, thereby increasing the flow area within the intake piping system 40 and thus regulating the fluid velocity. Therefore, this arrangement effectively ensures the flow velocity of the fluid entering the oil-gas separator, preventing excessive velocity and guaranteeing the separator's performance.

[0044] Specifically, there are two air inlets, namely the first air inlet 50 and the second air inlet 60, and multiple exhaust outlets. The fluid flow within the air intake pipeline system 40 is mainly divided into two types:

[0045] 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.

[0046] The second type involves fluid being introduced through the first air inlet 50, with the fluid being discharged through multiple exhaust ports.

[0047] Therefore, in this application, when the flow rate of fluid entering the intake pipe system 40 is small, the fluid can enter through the second intake port 60. When the flow rate of fluid entering the intake pipe system 40 is large, the fluid can enter through the first intake port 50. That is, in this application, of the first compressor 300 and the second compressor 400, the one with the larger displacement can be connected to the first intake port 50, while the one with the smaller displacement can be connected to the second intake port 60.

[0048] Optionally, the diameter of the first air inlet 50 is larger than the diameter of the second air inlet 60. Since the small-displacement compressor is connected to the second air inlet 60, designing the diameter of the second air inlet 60 to be smaller can effectively ensure that the speed of the fluid discharged from the small-displacement compressor when entering the oil-gas separator meets the separation speed of the oil-gas separator, thereby ensuring the separation effect of the oil-gas separator.

[0049] 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 70 and a second exhaust outlet 80. The air intake pipeline system 40 also includes an external pipeline 90 and an internal pipeline 100. The external pipeline 90 has a first air inlet 50 and a first exhaust outlet 70. At least a portion of the internal pipeline 100 is located inside the external pipeline 90, and the internal pipeline 100 has a second air inlet 60 and a second exhaust outlet 80. Preferably, the internal pipeline 100 includes a delivery pipe 110 and a limiting member 120. The delivery pipe 110 has a main pipeline 111 and a first branch 112 and a second branch 113 respectively connected to the main pipeline 111. The main pipeline 111, the first branch 112 and the second branch 113 form a three-way pipeline structure. The end of the main pipeline 111 away from the first branch 112 has a second exhaust port 80, and the end of the first branch 112 away from the main pipeline 111 has a second air inlet 60. The end of the first branch 112 with the second air inlet 60 extends out of the external pipeline 90. At least a portion of the limiting member 120 is closably disposed at the end of the second branch 113 away from the main pipeline 111. When the limiting member 120 is opened, the end of the second branch 113 away from the main pipeline 111 is connected to the interior of the external pipeline 90. In other words, in this embodiment, for a large-displacement compressor, it can be connected to the first air inlet 50, while for a small-displacement compressor, it can be connected to the second air inlet 60. Furthermore, when the fluid discharged from the large-displacement compressor enters the first air inlet 50, the limiting member 120 can open, allowing the fluid to flow through the internal pipe 100, the portion between the internal pipe 100 and the external pipe 90, and to be discharged from the first exhaust port 70 and the second exhaust port 80.

[0050] In other words, in the actual manufacturing process, the tee can be modified to serve as the internal pipeline 100 in this application. It should be noted that other pipelines need to be connected appropriately at the port of the tee to ensure the sealing performance and usability of the internal pipeline 100.

[0051] Optionally, one end of the internal pipe 100 having the second exhaust port 80 extends from the first exhaust port 70; or the end of the internal pipe 100 having the second exhaust port 80 is flush with the first exhaust port 70.

[0052] Optionally, the end of the second branch 113 away from the main branch 111 extends toward the end of the external pipeline 90 that has the first air inlet 50. With this arrangement, a portion of the fluid entering through the first air inlet 50 can more easily enter the interior of the internal pipeline 100 through the second branch 113.

[0053] Optionally, the extension direction of the first branch 112 and the extension direction of the second branch 113 are perpendicular to each other.

[0054] Specifically, the internal pipeline 100 also includes multiple positioning rings 130. At least one positioning ring 130 is fitted onto one end of the main pipeline 111 with the second exhaust port 80 and the other end of the second branch pipeline 113 away from the main pipeline 111, respectively, and the outer periphery of the positioning ring 130 abuts against the inner wall of the external pipeline 90. Furthermore, the second branch pipeline 113 has a variable diameter section 1131 corresponding to the positioning ring 130, with the positioning ring 130 fitted onto the end of the variable diameter section 1131, and the diameter of the variable diameter section 1131 being larger than the diameter of the inner ring 131. Simultaneously, the main pipeline 111 has a bent section 1111 corresponding to the positioning ring 130, with the positioning ring 130 fitted onto the bent portion of the bent section 1111.

[0055] It should be noted that in this application, the external pipeline 90 is also provided with a corresponding bend section 1111 corresponding to the bend section 1111 of the internal pipeline 100, so as to ensure that the parts of the internal pipeline 100 and the external pipeline 90 extending into the housing 10 can be parallel or approximately parallel to each other. At the same time, the bend section 1111 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.

[0056] In one specific embodiment of this application, the positioning ring 130 includes an inner ring 131, an outer ring 132, and connecting ribs 133. The inner ring 131 is sleeved on the main pipeline 111 or the second branch pipeline 113; the diameter of the outer ring 132 is larger than the diameter of the inner ring 131 and abuts against the inner sidewall of the external pipeline 90; there are multiple connecting ribs 133, and the two ends of the connecting ribs 133 are respectively connected to the inner ring 131 and the outer ring 132.

[0057] Furthermore, in this application, multiple vent holes are formed between the inner ring 131, the outer ring 132, and the connecting rib 133 to allow refrigerant to pass through, and the inner ring 131 of the positioning ring 130 forms an interference fit with the outer wall of the internal pipeline 100.

[0058] In one specific embodiment of this application, when fluid is introduced through the first air inlet 50, the limiting member 120 can avoid the end of the second branch 113 after being heated. Furthermore, the limiting member 120 includes a deformable portion 121 and a sealing portion 122. The first end of the deformable portion 121 is connected to the inner wall of the external pipe 90, and the second end of the deformable portion 121 extends toward the second branch 113. The deformable portion 121 has an open position and a closed position. The sealing portion 122 is connected to the second end of the deformable portion 121 and moves with the deformable portion. When the deformable portion 121 is in the closed position, at least a portion of the sealing portion 122 covers the opening of the second branch 113 at the end away from the main pipe 111. When the deformable portion 121 is in the open position, the sealing portion 122 avoids at least a portion of the opening of the second branch 113 at the end away from the main pipe 111.

[0059] Optionally, the sealing part 122 includes a sealing ball, which can cover or avoid the opening of the second branch 113 at the end away from the main branch 111.

[0060] Optionally, the deformable portion includes at least two stacked metal sheets with different coefficients of expansion. Specifically, the coefficient of expansion of the lower metal sheet is greater than that of the upper metal sheet, and the deformable portion and the sealing portion 122 are located above the second branch 113. Therefore, when the deformable portion expands due to heat, it can cause the sealing portion 122 to tilt upwards, thereby allowing the sealing portion 122 to avoid the second branch 113, and thus allowing a portion of the fluid entering from the first air inlet 50 to enter the internal pipe 100.

[0061] Specifically, the intake piping system 40 also includes a one-way valve 200, which is located at the end of the first branch 112 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 200 can also be located upstream of the first intake port 50. Furthermore, when fluid is vented through the first intake port 50, the one-way valve 200 corresponding to the first branch 112 closes, thereby ensuring that fluid does not flow back through the second intake port 60.

[0062] Of course, a valve structure such as a solenoid valve can be used instead of the one-way valve 200 in this application. Furthermore, in this application, the exhaust pipe of the heat exchange system is connected to the first air inlet 50, while the return pipe is connected to the second air inlet 60.

[0063] 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.

[0064] 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 return pipe. 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 rotates, causing the refrigerant to enter the oil-gas separator at high speed and then flow out tangentially, spraying 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.

[0065] In this application, when using a tee to fabricate the internal piping 100, the preferred connection method between the tee and other connecting pipes is welding, since refrigeration systems generally use copper piping. Of course, for different usage requirements, heat shrink tubing or other fixing connection devices, such as pipe clamps, pipe ferrules, and wire ties, can also be used to make the connection between the connecting pipes and the tee more secure.

[0066] In one specific embodiment of this application, the limiting member 120 includes two bimetallic strips with different coefficients of thermal expansion and a sealing ball. The bimetallic strips with different coefficients of thermal expansion connect to the sealing ball, with the lower metal layer of the bimetallic strip having a larger coefficient of thermal expansion than the upper metal layer. The other end of the bimetallic strip is fixed to the inner wall of the external pipe 90. Below the critical temperature, the deformation of the bimetallic strip causes the sealing ball to tighten at the inlet end of the second branch 113, sealing the inlet of the second branch 113. Above the critical temperature, the deformation of the bimetallic strip causes the sealing ball to gradually move away from the inlet end of the second branch 113, thus opening the inlet of the second branch 113. In terms of manufacturing process, the portion of the external pipe 90 corresponding to the first branch 112 and the second branch 113 can be formed by cutting open a straight pipe to create two groove-shaped metal parts. One of the parts has a through hole machined on its side wall. The first branch 112 passes through the through hole and is welded and sealed. The positioning ring 130 rests on the inner wall of the metal part, and one end of the bimetallic strip is fixed to the inner wall of the metal part. Finally, the two metal parts are re-welded to form the original straight pipe shape. Thus, a portion of the internal pipe 100 can be placed inside the external pipe 90. To avoid excessive deformation of the bimetallic strip at low temperatures, which could cause excessive pressure between the sealing ball and the second branch 113, a compensating spring is added between the bimetallic strip and the sealing ball. The deformation of the spring counteracts the excessive deformation stress.

[0067] In one specific embodiment of this application, such as Figure 1 and Figure 2 As shown, the first compressor 300 is a large-displacement compressor, and the second compressor 400 is a small-displacement compressor. The working principle of the oil-gas separator is as follows:

[0068] The high-temperature, high-pressure refrigerant exhaust from the large-displacement compressor enters the oil-gas separator through the exhaust pipe. The high-temperature refrigerant heats the bimetallic strip, causing it to deform and drive the sealing ball away from the inlet of the second branch 113. This allows part of the high-temperature refrigerant gas to enter the internal pipe 100, while the other part flows between the internal pipe 100 and the external pipe 90. This ensures that the large-displacement compressor fully utilizes the original flow area of ​​the internal pipe 100. After efficient oil-gas separation inside the oil-gas separator, the high-temperature, high-pressure refrigerant gas enters the condenser through the outlet pipe 30.

[0069] When the large-displacement compressor stops running or the solenoid valve on the exhaust pipe is closed, the large-displacement compressor itself acts as a closed valve, preventing refrigerant from flowing through it. Because the large-displacement compressor is off, the refrigerant pressure and temperature in the exhaust pipe decrease. The bimetallic strip deforms, causing the sealing ball to move towards the inlet of the second branch 113 until it seals the inlet of the second branch 113. The small-displacement compressor starts running to recover refrigerant from the outdoor unit, allowing the refrigerant to be stored inside the evaporator of the indoor unit. The low-temperature, low-pressure refrigerant gas returning from the condenser of the outdoor unit can only enter the oil-gas separator through the second inlet 60 of the first branch 112. Due to the relatively small diameter of the internal pipe 100, even a small flow rate of refrigerant can achieve high-speed flow, resulting in highly efficient oil-gas 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, 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 intake pipeline system (40) introduces fluid through different intake ports, the flow area of ​​the fluid passage through which the fluid passes is different. 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 (70) and a second exhaust port (80). The air intake pipeline system (40) further includes: An external pipeline (90) having a first air inlet (50) and a first exhaust outlet (70); An internal conduit (100), at least a portion of which is located inside the external conduit (90), and the internal conduit (100) having a second air inlet (60) and a second air outlet (80). The internal piping (100) includes: The conveying pipe (110) has a main pipeline (111) and a first branch (112) and a second branch (113) respectively connected to the main pipeline (111). The main pipeline (111), the first branch (112) and the second branch (113) form a three-way pipeline structure. The end of the main pipeline (111) away from the first branch (112) has a second exhaust port (80). The end of the first branch (112) away from the main pipeline (111) has a second air inlet (60). The end of the first branch (112) with the second air inlet (60) extends out of the external pipeline (90). A limiting member (120) is provided at least a portion of which is closably disposed at one end of the second branch (113) away from the main branch (111). When the limiting member (120) is open, the end of the second branch (113) away from the main branch (111) is connected to the interior of the external pipeline (90).

2. The oil-gas separator according to claim 1, characterized in that, When the intake piping system (40) introduces the fluid through different intake ports, the intake piping system (40) exhausts the fluid through at least one different exhaust port.

3. The oil-gas separator according to claim 2, characterized in that, There are two air inlets, namely the first air inlet (50) and the second air inlet (60), and there are multiple exhaust outlets. 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), the fluid is discharged through the plurality of air outlets.

4. The oil-gas separator according to claim 3, characterized in that, The diameter of the first air inlet (50) is larger than the diameter of the second air inlet (60).

5. The oil-gas separator according to claim 1, characterized in that, The internal conduit (100) has one end with the second exhaust port (80) extending from the first exhaust port (70); or The internal pipeline (100) has one end of the second exhaust port (80) flush with the first exhaust port (70).

6. The oil-gas separator according to claim 1, characterized in that, The second branch (113) extends from the end of the main pipeline (111) toward the end of the external pipeline (90) having the first air inlet (50); and / or The extension direction of the first branch (112) and the extension direction of the second branch (113) are perpendicular to each other.

7. The oil-gas separator according to claim 1, characterized in that, The internal pipeline (100) further includes multiple positioning rings (130). At least one positioning ring (130) is respectively fitted onto one end of the main pipeline (111) having the second exhaust port (80) and the other end of the second branch pipeline (113) away from the main pipeline (111). The outer periphery of the positioning ring (130) abuts against the inner wall of the external pipeline (90).

8. The oil-gas separator according to claim 7, characterized in that, The positioning ring (130) includes: Inner ring (131), which is fitted onto the main road (111) or the second branch road (113); Outer ring (132), the diameter of which is larger than that of the inner ring (131) and abuts against the inner wall of the external pipe (90); Connecting ribs (133), there are multiple connecting ribs (133), and the two ends of the connecting ribs (133) are respectively connected to the inner ring (131) and the outer ring (132).

9. The oil-gas separator according to claim 8, characterized in that, The second branch (113) is provided with a variable diameter section (1131) corresponding to the positioning ring (130). The positioning ring (130) is sleeved on the end of the variable diameter section (1131), and the diameter of the variable diameter section (1131) is larger than the diameter of the inner ring (131); and / or The main pipeline (111) is provided with a bent section (1111) corresponding to the positioning ring (130), and the positioning ring (130) is sleeved on the bent part of the bent section (1111).

10. The oil-gas separator according to any one of claims 6 to 9, characterized in that, When the fluid is introduced through the first air inlet (50), the limiting member (120) is able to avoid the end of the second branch (113) after being heated.

11. The oil-gas separator according to claim 10, characterized in that, The limiting member (120) includes: The deformable part (121) has a first end connected to the inner wall of the external pipeline (90), and a second end extending toward the second branch (113). The deformable part (121) has an open position and a closed position. A sealing part (122) is connected to the second end of the deformable part (121) and moves with the deformable part (121). When the deformable part (121) is in the closed position, at least a portion of the sealing part (122) covers the opening at the end of the second branch (113) away from the main branch (111). When the deformable part (121) is in the open position, the sealing part (122) avoids at least a portion of the opening at the end of the second branch (113) away from the main branch (111).

12. The oil-gas separator according to claim 11, characterized in that, The sealing part (122) includes a sealing ball, and the sealing ball is capable of covering or avoiding the opening at the end of the second branch (113) away from the main branch (111); and / or The deformable part (121) includes at least two stacked metal sheets, and the two metal sheets have different coefficients of thermal expansion.

13. The oil-gas separator according to any one of claims 6 to 9, characterized in that, The intake piping system (40) also includes a one-way valve (200), which is located at the end of the first branch (112) having the second intake port (60).

14. A heat exchange system, characterized in that, The oil-gas separator includes any one of claims 1 to 13.

15. The heat exchange system according to claim 14, characterized in that, The heat exchange system also includes: First compressor (300); The second compressor (400) has a different discharge capacity than the first compressor (300) and the second compressor (400), and the first compressor (300) and the second compressor (400) are respectively connected to different air inlets of the oil-gas separator.

Images