Oil separator and air conditioning unit

Abstract

The application provides an oil separator and an air conditioning unit. The oil separator comprises a shell, a first inner shell, a second inner shell, and the air inlet pipe, the interior of the first inner shell, the first air outlet, the first fluid passage, the spacing part, the second fluid passage, the interior of the second inner shell and the air outlet are sequentially communicated. The oil separator and the air conditioning unit provided by the application utilize the first inner shell to uniformly flow the oil-gas mixture entering the air inlet pipe, avoid the oil-gas mixture from directly flowing into the shell to impact the liquid surface of the oil storage area at the bottom of the shell, and effectively improve the separation effect of the oil-gas mixture and the separation effect of the oil separator under the action of three separation modes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of separation equipment, in particular to an oil separator and an air conditioning unit. BACKGROUND

[0002] In a refrigeration and air conditioning system, refrigeration oil is essential for the safe and stable operation of the compressor, which mainly plays a role in cooling, lubrication, sealing, etc. During the operation of the refrigeration unit, part of the refrigeration oil will mix into the refrigerant vapor discharged by the compressor in the form of oil droplets, thereby participating in the system circulation. The participation of refrigeration oil in system circulation will adversely affect the performance of the heat exchanger, the efficiency of the system and the safe operation of the compressor. Studies have shown that when the circulating amount of refrigeration oil is 5%, the heat exchange capacity of the evaporator decreases by 10%. When the oil content in the system increases by 1%, the system COP decreases by 2.5%, and at the same time, the refrigeration oil participating in circulation will be left in the system, which is extremely easy to cause the compressor to run out of oil and malfunction. To solve this problem, we usually set an oil separator between the compressor and the condenser. The oil separator, as one of the four key components of a screw refrigeration unit, plays a role in separating and filtering the mixture of high-temperature and high-pressure gaseous refrigerant and refrigeration oil discharged by the compressor in the refrigeration cycle. Through the separation of oil droplets, the refrigeration oil is separated from the refrigerant vapor to prevent the refrigeration oil from participating in the system circulation. At the same time, the separated refrigeration oil is timely transported to the compressor to avoid damage to the compressor due to lack of oil.

[0003] The conventional vertical oil separation structure in the prior art, the gaseous refrigerant with oil enters the oil separation space from the top inlet, after being dispersed, part of the large oil droplets first flow downward under the action of gravity to the bottom and enter the oil return area, most of them are blown up and entrained, hit the cylinder, and part of the oil droplets are separated, the remaining small oil droplets continue to enter the oil separation space along the airflow. During the flow process, under the action of gravity and inertial force, the gaseous refrigerant is lighter and flows toward the oil separation filter screen, and the small oil droplets gradually decrease in speed during the flow process and finally settle in the bottom oil level area. The gas flow rate in it is high or the flow field design is unreasonable, the gaseous refrigerant will impact the refrigeration oil collected at the bottom of the container, causing liquid level fluctuation, reducing the oil return efficiency of the unit oil return pipe, and affecting the stable operation state of the liquid level meter or oil level mirror. SUMMARY

[0004] In order to solve the technical problems of poor separation effect and unreliable oil return of the oil separator, an oil separator and an air conditioning unit are provided, which utilize the first inner shell and the second inner shell to limit the flow of the oil-gas mixture to improve the separation efficiency and avoid the oil-gas mixture directly impacting the liquid surface of the oil storage area.

[0005] An oil separator, comprising:

[0006] An outer shell, the outer shell being provided with an air inlet pipe and an air outlet;

[0007] A first inner shell is arranged in the outer shell, a first fluid passage is formed between the first inner shell and the outer shell, and the air inlet is in communication with the inside of the first inner shell, and a first air outlet is arranged on the first inner shell;

[0008] A second inner shell is arranged in the outer shell, and a spacing portion is arranged between the second inner shell and the first inner shell, a second fluid passage is formed between the second inner shell and the outer shell, and the air outlet is in communication with the inside of the second inner shell;

[0009] The air inlet pipe, the inside of the first inner shell, the first air outlet, the first fluid passage, the spacing portion, the second fluid passage, the inside of the second inner shell, and the air outlet are sequentially communicated.

[0010] The oil separator further comprises a first air equalization structure arranged in the first inner shell, and the first air equalization structure divides the inside of the first inner shell into an air inlet cavity and an air equalization cavity, a first air equalization hole is arranged on the first air equalization structure, and the air inlet pipe is communicated with the first air outlet through the air inlet cavity, the first air equalization hole, and the air equalization cavity.

[0011] The first air equalization structure has a first side wall, the distance between the lower end of the first side wall and the central axis of the first inner shell is smaller than the distance between the upper end of the first side wall and the central axis of the first inner shell, and the first air equalization hole is arranged on the first side wall.

[0012] The first air equalization structure comprises a first air equalization shell, the inside of the first air equalization shell forms the air inlet cavity, the air equalization cavity is formed between the first air equalization shell and the first inner shell, the shape of the first air equalization shell is a reverse circular truncated cone shape, and the side wall of the reverse circular truncated cone shape forms the first side wall.

[0013] The oil separator further comprises a second air equalization structure arranged in the air inlet cavity, and the second air equalization structure has a second air equalization hole, and the air inlet pipe is communicated with the air inlet cavity through the second air equalization hole.

[0014] The second air equalization structure has a second side wall, the distance between the lower end of the second side wall and the central axis of the first inner shell is greater than the distance between the upper end of the first side wall and the central axis of the first inner shell, and the second air equalization hole is arranged on the second side wall.

[0015] The second air equalization structure comprises a second air equalization shell, the second air equalization shell is arranged on the end portion of the air inlet pipe communicated with the air inlet cavity, the shape of the second air equalization shell is a circular truncated cone shape, and the side wall of the circular truncated cone shape forms the second side wall.

[0016] The first inner shell comprises a gas equalizing section and a flow guiding section which are in communication with each other, the first gas equalizing structure is arranged in the gas equalizing section, the flow guiding section is arranged on the side of the gas equalizing section away from the partition, the first gas outlet is arranged on the flow guiding section, and the flow passage area of the flow guiding section gradually decreases in the direction from the gas equalizing section to the first gas outlet.

[0017] The oil separator further comprises a third gas equalizing structure, the third gas equalizing structure is arranged in the gas equalizing section, and the third gas equalizing structure is located between the first gas equalizing structure and the flow guiding section.

[0018] The flow guiding section and the inner wall of the outer shell form part of the first fluid passage, and the flow passage area of the first fluid passage gradually decreases in the direction of fluid flow in the first fluid passage.

[0019] The first inner shell is provided with a gas passing hole on the side wall of the partition, and a first filter structure is arranged at the gas passing hole.

[0020] The bottom of the outer shell forms a first oil storage area, the gas outlet direction of the first gas outlet is towards the first oil storage area, and a first gas baffle is arranged between the first gas outlet and the first oil storage area.

[0021] The first gas baffle is provided with a flow guiding surface, and the fluid of the first gas outlet can flow to the inner wall of the outer shell under the guidance of the flow guiding surface.

[0022] The flow passage area of the second fluid passage gradually decreases in the direction of fluid flow in the second fluid passage.

[0023] The oil separator further comprises an exhaust pipe, one end of the exhaust pipe is in communication with the inside of the second inner shell, and the other end of the exhaust pipe is in communication with the exhaust port.

[0024] The oil separator further comprises a second filter structure, and the second filter structure is arranged in the exhaust pipe.

[0025] Part of the exhaust pipe is located in the second inner shell, and a third fluid passage is formed between the exhaust pipe and the inner wall of the second inner shell.

[0026] The flow passage area of the third fluid passage gradually decreases in the direction of fluid flow in the third fluid passage.

[0027] The top of the second inner shell is provided with an opening, the second fluid passage is in communication with the inside of the second inner shell through the opening, the bottom of the second inner shell forms a second oil storage area, a second gas baffle is arranged between the opening and the second oil storage area, and an oil passing hole is arranged on the second gas baffle.

[0028] The second inner shell comprises a communicating section and a collecting section in communication with each other, the collecting section is located at a side of the communicating section away from the exhaust port, and a variation rate of a flow area of the second fluid passage formed between the collecting section and the inner wall of the outer shell is higher than a variation rate of a flow area of the second fluid passage formed between the communicating section and the inner wall of the outer shell.

[0029] An air conditioning unit comprises the oil separator.

[0030] The oil separator and the air conditioning unit provided by the application can make the oil-gas mixture entering the air inlet pipe flow uniformly by the first inner shell, avoid the oil-gas mixture from flowing directly into the outer shell to impact the liquid surface of the oil storage area at the bottom of the outer shell, and form a continuous baffle passage in the first inner shell, the first fluid passage formed between the first inner shell and the outer shell, the part of the outer shell at the interval part between the first inner shell and the second inner shell, the second fluid passage formed between the second inner shell and the outer shell, and the inside of the second inner shell. The oil-gas mixture needs to flow continuously and collide in the process of flowing in the outer shell, and is also affected by gravity in the process of flowing. Under the action of the three separation modes, the separation effect of the oil-gas mixture is effectively improved, and the separation effect of the oil separator is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure schematic view of the oil separator provided by the embodiment of the application is shown in the figure;

[0032] Figure 2 The structure schematic view of the oil separator provided by the embodiment of the application is shown in the figure;

[0033] Figure 3 The structure schematic view of the first inner shell of the oil separator provided by the embodiment of the application is shown in the figure;

[0034] Figure 4 The structure schematic view of the second inner shell of the oil separator provided by the embodiment of the application is shown in the figure;

[0035] Figure 5 The structure schematic view of the first air equalizing structure of the oil separator provided by the embodiment of the application is shown in the figure;

[0036] Figure 6 The sectional view of the first air equalizing structure of the oil separator provided by the embodiment of the application is shown in the figure;

[0037] Figure 7 The structure schematic view of the second air equalizing structure of the oil separator provided by the embodiment of the application is shown in the figure;

[0038] Figure 8 The side view of the second air equalizing structure of the oil separator provided by the embodiment of the application is shown in the figure;

[0039] Figure 9 Structure diagram of a first air baffle of an oil separator according to an embodiment of the present application;

[0040] Figure 10 Structure diagram of a third air equalizing structure of an oil separator according to an embodiment of the present application;

[0041] Figure 11 Another structure diagram of a first inner shell of an oil separator according to an embodiment of the present application;

[0042] In the figure:

[0043] 1, outer shell; 11, air inlet pipe; 12, air outlet; 2, first inner shell; 13, first fluid passage; 21, first air outlet; 3, second inner shell; 14, spacing part; 15, second fluid passage; 22, first air equalizing structure; 23, air inlet cavity; 24, air equalizing cavity; 221, first air equalizing hole; 25, second air equalizing structure; 251, second air equalizing hole; 26, air equalizing section; 27, flow guiding section; 28, first air baffle; 281, flow guiding surface; 29, third air equalizing structure; 4, first filter structure; 5, air outlet pipe; 16, third fluid passage; 32, communication section; 33, liquid collecting section; 34, second air baffle; 6, second filter structure. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0045] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0046] It should be noted that the terms "first", "second", etc. in the description of the present application and the claims and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0047] It should be noted that in the description of the present application, the terms "up", "down", "left", "right", "in", "out" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In actual operation of the unit, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor entrains part of the compressor refrigeration oil particles into the oil separator. If this part of the refrigeration oil is entrained into the condenser by the gas flow or enters the evaporator with the circulating medium, it not only reduces the heat exchange capacity of the two devices, but also causes the compressor to be damaged due to lack of refrigeration oil lubrication, ultimately leading to the system unable to continue safe operation. Therefore, in order to solve the problem of refrigeration oil separation and ensure the continuous and safe operation of the system, an oil separator is used to separate the oil and gas of the fluid discharged by the compressor, and the high-purity gaseous refrigerant after separation enters the condenser, and the liquid refrigeration oil returns to the compressor by using the pressure difference effect. However, the separation effect of the oil separator in the prior art is poor, and therefore the present application provides a kind of Figures 1 to 11The oil separator shown comprises: a shell 1, which is provided with an air inlet pipe 11 and an air outlet 12; a first inner shell 2, which is arranged in the shell 1, a first fluid passage 13 is formed between the first inner shell 2 and the shell 1, and the air inlet pipe 11 communicates with the inside of the first inner shell 2, and the first inner shell 2 is provided with a first air outlet 21; a second inner shell 3, which is arranged in the shell 1, and the second inner shell 3 and the first inner shell 2 have a spacing part 14 therebetween, a second fluid passage 15 is formed between the second inner shell 3 and the shell 1, and the air outlet 12 communicates with the inside of the second inner shell 3; the air inlet pipe 11, the inside of the first inner shell 2, the first air outlet 21, the first fluid passage 13, the spacing part 14, the second fluid passage 15, the inside of the second inner shell 3 and the air outlet 12 communicate in sequence. The oil-gas mixture entering the air inlet pipe 11 is evenly distributed by the first inner shell 2, avoiding the oil-gas mixture flowing directly into the shell 1 and impacting the liquid surface of the oil storage area at the bottom of the shell 1, and the inside of the first inner shell 2, the first fluid passage 13 formed between the first inner shell 2 and the shell 1, the part of the shell 1 at the spacing part 14 between the first inner shell 2 and the second inner shell 3, the second fluid passage 15 formed between the second inner shell 3 and the shell 1, and the inside of the second inner shell 3 form a continuous baffle passage, and the oil-gas mixture needs to be baffled and collided constantly during the flow in the shell 1, and is also affected by gravity during the flow, and under the action of the three separation methods, the separation effect of the oil-gas mixture is effectively improved, and the separation effect of the oil separator is improved.

[0050] As Figure 1As shown, one end of the air inlet pipe 11 communicates with the outside of the housing 1, and the other end extends into the inside of the first inner housing 2. At this time, the direction of the air inlet pipe 11 sending the oil-gas mixture into the first inner housing 2 is away from the oil storage area at the bottom of the housing 1, so that the oil-gas mixture does not directly affect the liquid level of the oil storage area after entering the housing 1, and the oil return of the oil separator can be ensured. Then the oil-gas mixture will be deflected in the first inner housing 2 and collide with the inner wall of the first inner housing 2, and be separated once, and then be discharged from the first inner housing 2 through the first air outlet 21 of the first inner housing 2. Since the oil-gas mixture has been deflected and collided in the first inner housing 2, the kinetic energy of the oil-gas mixture is reduced, and the influence on the liquid level of the oil storage area is reduced. Then it flows upward through the first fluid channel 13 and flows to the interval 14 between the first inner housing 2 and the second inner housing 3, and the flow area suddenly increases, and the flow rate and pressure of the fluid will change, thereby separating part of the oil droplets from the oil-gas mixture again for secondary separation. Then it flows through the second fluid channel 15 and enters the second inner housing 3 from the top of the second inner housing 3. At this time, the oil-gas mixture is deflected again for three times of separation, and finally is discharged from the inside of the second inner housing 3 to the air outlet 12, completing the oil-gas separation. In the process of flowing in the first fluid channel 13, in the process of flowing in the second fluid channel 15, and in the process of flowing in the interval 14, the oil-gas mixture needs to flow upward, and at this time the oil-gas mixture will be affected by gravity and separated. At this time, the oil-gas mixture is separated more than four times, effectively improving the separation effect of the oil separator. The frozen oil in the multiple separation processes can flow downward along the inner wall of the first inner housing 2, the inside of the housing 1 and the inner wall of the second inner housing 3, and finally be discharged from the housing 1, realizing the recovery of the frozen oil.

[0051] As an implementation form, the oil separator further comprises a first gas equalizing structure 22 arranged in the first inner shell 2, and the first gas equalizing structure 22 divides the inside of the first inner shell 2 into an air inlet cavity 23 and a gas equalizing cavity 24, and a first gas equalizing hole 221 is arranged on the first gas equalizing structure 22, and the air inlet pipe 11 communicates with the first air outlet 21 through the air inlet cavity 23, the first gas equalizing hole 221 and the gas equalizing cavity 24. The first gas equalizing structure 22 is used for equalizing the flow of the oil-gas mixture entering the first inner shell 2, improving the collision effect between the oil-gas mixture and the inner wall of the first inner shell 2, and improving the separation effect of the first inner shell 2 on the oil-gas mixture. The oil-gas mixture entering the air inlet pipe 11 first flows into the air inlet cavity 23, and since the flow area of the air inlet pipe 11 is smaller than that of the air inlet cavity 23, the flow area suddenly increases at this time, and the flow rate and pressure of the fluid will change, thereby separating part of the oil droplets from the oil-gas mixture again, thereby effectively increasing the separation effect of the oil-gas mixture. Then, the oil-gas mixture flows to the periphery of the first gas equalizing structure 22 under the action of the first gas equalizing hole 221, and then collides with all the inner walls of the first inner shell 2, thereby avoiding the problem that the collision area of the oil-gas mixture with the inner wall of the first inner shell 2 is small and cannot be fully separated. In the collision process, the frozen oil in the oil-gas mixture adheres to the inner wall of the first inner shell 2, thereby realizing the separation of the frozen oil. The separated oil-gas mixture flows along the inner wall of the first inner shell 2 and is finally discharged from the first inner shell 2 through the first air outlet 21, thereby completing the separation process of the oil-gas mixture in the first inner shell 2.

[0052] The first gas equalizing structure 22 has a first side wall, the distance between the lower end of the first side wall and the center axis of the first inner shell 2 is smaller than the distance between the upper end of the first side wall and the center axis of the first inner shell 2, and the first gas equalizing hole 221 is arranged on the first side wall. That is, the first side wall is arranged in an inclined manner, so that the gas outlet direction of the first gas equalizing hole 221 is also inclined relative to the center axis of the first inner shell 2. The oil-gas mixture discharged from the first gas equalizing hole 221 flows in a downward and oblique direction of the first inner shell 2, collides with the side wall of the first inner shell 2, and flows downward in the first inner shell 2, thereby being finally discharged from the first air outlet 21 at the lower part of the first inner shell 2.

[0053] As Figure 1As shown, the first equalizing structure 22 includes a first equalizing shell, an inside of the first equalizing shell forms the air inlet cavity 23, the equalizing cavity 24 is formed between the first equalizing shell and the first inner shell 2, the first equalizing shell is in the shape of an inverted truncated cone, and the side wall of the inverted truncated cone forms the first side wall. Among them, the diameter of the top plate of the first equalizing shell is greater than the diameter of the bottom plate of the first equalizing shell, so as to ensure the inclination of the side wall of the inverted truncated cone, and the central axis of the inverted truncated cone of the first equalizing shell is collinear with the central axis of the first inner shell 2, at this time the oil-gas mixture in the air inlet cavity 23 can flow from the annular side wall of the inverted truncated cone into the equalizing cavity 24, thereby improving the collision separation effect between the oil-gas mixture and the inside of the first inner shell 2.

[0054] Since the oil-gas mixture entering the air inlet pipe 11 has a certain flow rate and pressure, and the air inlet pipe 11 is introduced from the side of the outer shell 1, the air inlet pipe 11 needs to be bent, and this bending will cause the oil-gas mixture to have a certain deflection. When it directly flows into the air inlet cavity 23, it will cause the flow rate and flow of part of the oil-gas mixture in the air inlet cavity 23 to be too large, and the flow rate and flow of another part of the oil-gas mixture to be smaller, causing the flow equalization effect of the oil-gas mixture to be poor. Therefore, the oil separator of the present application further includes a second equalizing structure 25, which is arranged in the air inlet cavity 23, and the second equalizing structure 25 has a second equalizing hole 251, and the air inlet pipe 11 communicates with the air inlet cavity 23 through the second equalizing hole 251. The oil-gas mixture entering the air inlet pipe 11 first passes through the second equalizing structure 25 for flow equalization, and then enters the air inlet cavity 23 again to be flow equalized by the first equalizing structure 22, further improving the flow equalization effect of the oil-gas mixture and ensuring that the oil-gas mixture can fully collide with the inner wall of the first inner shell 2, thereby improving the separation effect of the oil-gas mixture in the first inner shell 2.

[0055] The second uniform gas structure 25 has a second side wall, the distance between the lower end of the second side wall and the central axis of the first inner shell 2 is greater than the distance between the upper end of the first side wall and the central axis of the first inner shell 2, and the second uniform gas hole 251 is arranged on the second side wall. That is, the second side wall is inclined at this time, so that the gas outlet direction of the second uniform gas hole 251 is also inclined relative to the central axis of the first inner shell 2, and the oil-gas mixture discharged by the second uniform gas hole 251 flows in the obliquely upward direction of the first inner shell 2. At this time, the oil-gas mixture has a direction component flowing towards the first side wall, and also has a direction component flowing towards the top of the first uniform gas shell. At this time, the problem of uneven distribution of the oil-gas mixture caused by the bending of the intake pipe 11 can be offset by the direction component flowing towards the top of the first inner shell 2. Part of the oil-gas mixture will flow into the area with smaller flow and flow rate after colliding at the top plate of the first uniform gas shell, thereby improving the uniformity of the oil-gas mixture in the intake cavity 23 and improving the effect of uniform flow of the oil-gas mixture by the first uniform gas hole 221.

[0056] As shown in Figure 1 The second uniform gas structure 25 includes a second uniform gas shell, which is arranged on the end of the intake pipe 11 communicating with the intake cavity 23. The second uniform gas shell is in the shape of a circular truncated cone, and the side wall of the circular truncated cone forms the second side wall. The diameter of the top plate of the second uniform gas shell is smaller than the diameter of the bottom plate of the second uniform gas shell, so as to ensure the inclination of the side wall of the circular truncated cone. The central axis of the circular truncated cone of the second uniform gas shell is collinear with the central axis of the first inner shell 2. At this time, the oil-gas mixture entering the intake pipe 11 can flow from the annular side wall of the circular truncated cone into the intake cavity 23, thereby improving the uniformity of the oil-gas mixture in the intake cavity 23 and improving the separation effect of the oil-gas mixture by the first inner shell 2.

[0057] The first uniform gas hole 221 and the second uniform gas hole 251 need to be arranged in a staggered manner to avoid the oil-gas mixture discharged by the second uniform gas hole 251 directly passing through the first uniform gas hole 221, increase the collision effect of the oil-gas mixture with the first uniform gas shell, and improve the separation effect of the oil separator.

[0058] The sum of the flow areas of all the first uniform gas holes 221 is greater than or equal to twice the flow area of the intake pipe 11, effectively reducing the flow rate of the oil-gas mixture flowing through the first uniform gas hole 221, reducing the entrainment effect of the oil-gas mixture on the oil droplets, and improving the separation effect of the oil separator.

[0059] The sum of the flow areas of all the second uniform gas holes 251 is greater than or equal to the flow area of the gas inlet pipe 11, and the sum of the flow areas of all the second uniform gas holes 251 is less than the sum of the flow areas of all the first uniform gas holes 221, so that the flow rate of the oil-gas mixture entering the gas inlet pipe 11 gradually decreases, further reducing the entrainment effect of the oil-gas mixture on the oil droplets, and further improving the separation effect of the oil separator.

[0060] The first inner shell 2 includes a uniform gas section 26 and a flow guide section 27 in communication with each other, the first uniform gas structure 22 is arranged in the uniform gas section 26, the flow guide section 27 is arranged on the side of the uniform gas section 26 away from the partition 14, the first gas outlet 21 is arranged on the flow guide section 27, and the flow area of the flow guide section 27 gradually decreases in the direction from the uniform gas section 26 to the first gas outlet 21. The flow guide section 27 guides the oil-gas mixture that has been uniformly flowed through the second uniform gas structure 25 and the first uniform gas structure 22, so that all the oil-gas mixture can be discharged from the first inner shell 2 through the first gas outlet 21. Since the first gas outlet 21 is located at the bottom of the first inner shell 2, and the lower part of the first inner shell 2 is an oil storage area, the flow area of the first gas outlet 21 is reduced by the flow guide section 27, which although increases the flow rate of the oil-gas mixture, reduces the influence range of the oil-gas mixture on the liquid surface of the oil storage area, and also ensures the reliability of the oil return of the oil separator. Furthermore, since the flow area of the flow guide section 27 gradually decreases, a part of the first fluid channel 13 is formed between the flow guide section 27 and the inner wall of the outer shell 1, and the flow area of the first fluid channel 13 gradually decreases in the direction of the fluid flow in the first fluid channel 13. The oil-gas mixture discharged from the first gas outlet 21 flows upward through the first fluid channel 13, and when flowing through the part of the first fluid channel 13 between the flow guide section 27 and the inner wall of the outer shell 1, the oil droplets in the oil-gas mixture converge to form larger oil droplets and flow downward under the action of gravity. At the same time, the oil-gas mixture discharged from the first gas outlet 21 needs to be diverted to flow into the first fluid channel 13, and in this process, the oil-gas mixture has a flow direction component that collides with the inner wall of the outer shell 1. The larger oil droplets formed by convergence adhere to the inner wall of the outer shell 1. Even if the flow rate of the oil-gas mixture increases, it will not flow with the oil-gas mixture and will eventually be affected by gravity to flow downward along the inner wall of the outer shell 1, realizing the separation of the frozen oil. Figure 3 or Figure 11 As shown in the drawings, the cross section of the flow guide section 27 can be arc-shaped or inclined straight line-shaped, which can guide the oil-gas mixture and change the flow area of the first fluid channel 13.

[0061] The air outlet direction of the first air outlet 21 is towards the bottom of the shell 1, that is, the bottom of the shell 1 is formed with a first oil storage area, the air outlet direction of the first air outlet 21 is towards the first oil storage area, and the application is provided with a first air baffle 28 between the first air outlet 21 and the first oil storage area. The oil-gas mixture discharged from the first air outlet 21 is blocked by the first air baffle 28, avoiding the oil-gas mixture of the first air outlet 21 blowing the liquid level of the first oil storage area, thereby ensuring the reliable oil return of the oil separator, and the oil-gas mixture also collides with the first air baffle 28, thereby separating again, effectively improving the separation effect of the oil separator.

[0062] In order to avoid the oil-gas mixture colliding with the first air baffle 28 after the oil-gas mixture collides with the first air baffle 28, the first air baffle 28 is provided with a flow guide surface 281, and the fluid of the first air outlet 21 can flow towards the inner wall of the shell 1 under the guidance of the flow guide surface 281. The oil-gas mixture discharged from the first air outlet 21 can be guided by the flow guide surface 281 to quickly leave the first air baffle 28 after colliding with the flow guide surface 281, so that the oil-gas mixture flowing to the first air baffle 28 can collide with the first air baffle 28, thereby ensuring the collision effect of the first air baffle 28, and since the flow direction of the oil-gas mixture of the first air outlet 21 is basically opposite to the flow direction of the oil-gas mixture in the first fluid channel 13, the flow guide surface 281 is used to make the oil-gas mixture discharged from the first air outlet 21 turn to a certain extent, thereby facilitating the flow of the oil-gas mixture into the first fluid channel 13, avoiding the problem of vortex flow of the oil-gas mixture in the first fluid channel 13, and affecting the reliability of the oil separator. In particular, the flow guide surface 281 can turn the flow direction of the oil-gas mixture towards the inner wall of the shell 1, increase the collision effect between the oil-gas mixture and the inner wall of the shell 1, and further improve the separation effect of the oil separator.

[0063] The cross section of the first air baffle 28 is circular, the center of the circle is located on the center axis of the shell 1, and the diameter of the circle is greater than or equal to twice the diameter of the first air outlet 21, thereby ensuring the air blocking effect of the first air baffle 28.

[0064] The longitudinal cross section of the first air baffle 28 is triangular, at this time the bottom surface of the first air baffle 28 constitutes the bottom side of the triangle, and the inclined side of the triangle forms the flow guide surface 281, wherein the included angle between the inclined side and the bottom plate is in the range of 0° to 60°, preferably 10°, 20°, 30°, 40°, etc., as shown in Figure 9 The angle of the included angle needs to be set according to the distance between the first air baffle 28 and the inner wall of the shell 1 and the distance between the first air baffle 28 and the first air outlet 21.

[0065] In order to further improve the flow uniformity of the oil-gas mixture, the oil separator further comprises a third flow uniformity structure 29 arranged in the flow uniformity section 26 and located between the first flow uniformity structure 22 and the flow guide section 27. After colliding with the inner wall of the first inner shell 2, the oil-gas mixture after the second flow uniformity structure and the first flow uniformity structure flows through the third flow uniformity structure 29 again to further improve the flow uniformity of the oil-gas mixture, thereby improving the separation effect of the oil-gas mixture in the subsequent process and improving the separation effect of the oil separator.

[0066] The first inner shell 2 is provided with a gas passing hole on the side wall of the spacing portion 14, and the gas passing hole is provided with a first filter structure 4. The top plate of the first inner shell 2 constitutes the bottom of the spacing portion 14. Since the gas outlet direction of the first flow uniformity hole 221 on the first flow uniformity structure 22 is away from the top plate of the first inner shell 2, most of the oil-gas mixture still flows downward along the inner wall of the first inner shell 2. By arranging the gas passing hole, the part of the oil-gas mixture after the flow uniformity of the first flow uniformity structure 22 and carrying a small amount of oil droplets directly flows into the spacing portion 14 through the first filter structure 4, thereby avoiding the part of the oil-gas mixture from affecting the separation effect of the oil separator by carrying oil droplets, improving the gas flow efficiency of the oil separator, and also improving the separation effect of the oil separator. The first filter structure 4 is a filter screen.

[0067] Since the flow rate of the oil-gas mixture flowing through the spacing portion 14 is reduced due to the sudden change of the flow area of the spacing portion 14, in order to ensure the exhaust flow rate of the oil separator, the flow area of the second fluid channel 15 gradually decreases along the flow direction of the fluid in the second fluid channel 15. The second fluid channel 15 is used to accelerate the oil-gas mixture to ensure the exhaust speed of the oil separator.

[0068] The oil separator further comprises an exhaust pipe 5, one end of the exhaust pipe 5 is in communication with the inside of the second inner shell 3, and the other end is in communication with the exhaust port 12. The oil separator further comprises a second filter structure 6 arranged in the exhaust pipe 5. The second filter structure 6 arranged in the exhaust pipe 5 is used to filter the oil-gas mixture again to ensure the cleanliness of the refrigerant discharged at the exhaust port 12.

[0069] In order to further improve the separation effect of the oil separator, part of the exhaust pipe 5 is located in the second inner shell 3, and a third fluid channel 16 is formed between the exhaust pipe 5 and the inner wall of the second inner shell 3. The oil-gas mixture flowing out of the second fluid channel 15 needs to flow into the second inner shell 3 after being deflected, then flow into the exhaust pipe 5 again, and finally flow to the exhaust port 12 through the exhaust pipe 5, thereby increasing the separation times of the oil-gas mixture and improving the separation effect of the oil separator.

[0070] Along the fluid flow direction within the third fluid channel 16, the flow area of ​​the third fluid channel 16 gradually decreases. The third fluid channel 16 further accelerates the oil-gas mixture, increasing the distance the mixture travels into the second inner shell 3. This allows the oil-gas mixture to be deflected at a closer distance from the exhaust pipe 5, thereby improving the separation efficiency of the oil-gas mixture within the second inner shell 3 and effectively enhancing the separation efficiency of the oil separator.

[0071] In one embodiment, the second inner shell 3 includes a communicating section 32 and a liquid collecting section 33 that are interconnected. The liquid collecting section 33 is located on the side of the communicating section 32 away from the exhaust port 12, and the rate of change of the flow area of ​​the portion of the second fluid channel 15 formed between the liquid collecting section 33 and the inner wall of the outer shell 1 is higher than the rate of change of the flow area of ​​the portion of the second fluid channel 15 formed between the communicating section 32 and the inner wall of the outer shell 1. The oil-gas mixture in the partition 14 first flows through the portion of the second fluid channel 15 formed between the collecting section 33 and the inner wall of the outer shell 1. At this time, the cross-sectional area of ​​the oil-gas mixture corresponding to the partition 14 of the outer shell 1 suddenly decreases to the cross-sectional area of ​​the end of the second fluid channel 15 that connects to the partition 14. The pressure of the oil-gas mixture increases significantly, but the flow velocity of the oil-gas mixture is still relatively low. The oil-gas mixture is rapidly accelerated by the portion of the second fluid channel 15 with a larger rate of change, increasing the flow velocity of the oil-gas mixture. Then, it flows to the portion of the second fluid channel 15 formed between the connecting section 32 and the inner wall of the outer shell 1, slowing down the rate of increase in the flow velocity of the oil-gas mixture, ensuring that the pressure and flow velocity of the oil-gas mixture can meet the requirements of the oil separator's exhaust capacity. For example... Figure 4 In the process, the sidewall inclination angle of the connecting section 32 is 10°, while the sidewall inclination angle of the liquid collecting section 33 is 30°.

[0072] like Figure 1 and Figure 4 As shown in the figure, both the connecting section 32 and the liquid collecting section 33 are funnel-shaped. Along the direction away from the exhaust port 12, the cross-sectional area of ​​the connecting section 32 and the cross-sectional area of ​​the liquid collecting section 33 gradually decrease, thereby achieving the purpose of adjusting the flow area of ​​the second fluid channel 15. At the same time, the change in the cross-sectional area of ​​the connecting section 32 and the liquid collecting section 33 can guide the oil-gas mixture flowing inside the second inner shell 3, so that the oil-gas mixture flowing into the second inner shell 3 can collide and separate inside the second inner shell 3, thereby improving the separation effect of the oil separator.

[0073] In order to allow the exhaust pipe 5 to extend into the second inner shell 3 and to allow the oil-gas mixture to flow into the second inner shell 3, an opening is provided at the top of the second inner shell 3. The second fluid channel 15 communicates with the interior of the second inner shell 3 through the opening. The oil-gas mixture flowing in the second fluid channel 15 will first flow to the top of the second inner shell 3, and then be deflected and pass through the opening into the second inner shell 3, thereby improving the separation effect of the oil-gas mixture.

[0074] Furthermore, because the oil-gas mixture undergoes deflection within the second inner shell 3 and also flows through the second filtration mechanism, some refrigerant oil remains inside the second inner shell 3. Therefore, a second oil storage area is formed at the bottom of the second inner shell 3 to collect the refrigerant oil separated within the second inner shell 3. Since a liquid surface exists in the second oil storage area, a second baffle plate 34 is provided between the opening and the second oil storage area. The second baffle plate 34 has oil passage holes. The second baffle plate 34 prevents the oil-gas mixture flowing into the second inner shell 3 from impacting the liquid surface in the second oil storage area, thus affecting the oil separator's return oil effect. The oil passage holes on the second baffle plate 34 ensure that the refrigerant oil separated within the second inner shell 3 flows through the oil passage holes to the second oil storage area, guaranteeing the oil separator's separation effect.

[0075] Among them, such as Figure 1 As shown in the figure, an additional oil return pipe is installed at the second oil storage area. The oil return pipe can guide the refrigeration oil in the second oil storage area to the outside of the outer casing 1. Alternatively, an oil guide pipe can be installed inside the outer casing 1, allowing the refrigeration oil in the second oil storage area to flow directly to the first oil storage area at the bottom of the outer casing 1 through the guide pipe, ensuring reliable oil return from the oil separator.

[0076] At least two of the following central axes are collinear: the central axis of the outer shell 1, the central axis of the exhaust pipe 5, the central axis of the second inner shell 3, the central axis of the second baffle 34, the central axis of the first inner shell 2, the central axis of the first air distribution structure 22, the central axis of the second air distribution structure 25, and the central axis of the first baffle 28. Preferably, all of the aforementioned central axes are collinear.

[0077] Figure 1 The arrows in the diagram indicate the flow direction of the oil-gas mixture.

[0078] An air conditioning unit includes the oil separator described above.

[0079] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An oil separator, characterized in that: include: The outer casing (1) is provided with an air inlet pipe (11) and an exhaust port (12). The first inner shell (2) is disposed inside the outer shell (1), and a first fluid channel (13) is formed between the first inner shell (2) and the outer shell (1). The air inlet pipe (11) is connected to the interior of the first inner shell (2), and a first air outlet (21) is provided on the first inner shell (2). The second inner shell (3) is disposed inside the outer shell (1), and there is a gap (14) between the second inner shell (3) and the first inner shell (2). A second fluid channel (15) is formed between the second inner shell (3) and the outer shell (1). The exhaust port (12) is in communication with the interior of the second inner shell (3). The air inlet pipe (11), the interior of the first inner shell (2), the first air outlet (21), the first fluid channel (13), the spacer (14), the second fluid channel (15), the interior of the second inner shell (3), and the exhaust port (12) are connected in sequence; The oil separator further includes a first gas equalization structure (22), which is disposed inside the first inner shell (2) and divides the interior of the first inner shell (2) into an air inlet chamber (23) and a gas equalization chamber (24). The first gas equalization structure (22) is provided with a first gas equalization hole (221). The air inlet pipe (11) is connected to the first air outlet (21) through the air inlet chamber (23), the first gas equalization hole (221) and the gas equalization chamber (24). The first inner shell (2) includes an equalization section (26) and a guide section (27) that are interconnected. The first equalization structure (22) is disposed in the equalization section (26). The guide section (27) is disposed on the side of the equalization section (26) away from the interval (14). The first air outlet (21) is disposed on the guide section (27). Along the direction from the equalization section (26) to the first air outlet (21), the flow area of ​​the guide section (27) gradually decreases.

2. The oil separator according to claim 1, characterized in that: The first gas equalization structure (22) has a first sidewall. The distance between the lower end of the first sidewall and the central axis of the first inner shell (2) is less than the distance between the upper end of the first sidewall and the central axis of the first inner shell (2). The first gas equalization hole (221) is disposed on the first sidewall.

3. The oil separator according to claim 2, characterized in that: The first gas equalization structure (22) includes a first gas equalization shell, the air inlet cavity (23) is formed inside the first gas equalization shell, the gas equalization cavity (24) is formed between the first gas equalization shell and the first inner shell (2), the shape of the first gas equalization shell is an inverted frustum shape, and the side wall of the inverted frustum shape forms the first side wall.

4. The oil separator according to claim 2, characterized in that: The oil separator further includes a second gas equalization structure (25), which is disposed in the air inlet chamber (23) and has a second gas equalization hole (251). The air inlet pipe (11) is connected to the air inlet chamber (23) through the second gas equalization hole (251).

5. The oil separator according to claim 4, characterized in that: The second gas equalization structure (25) has a second sidewall. The distance between the lower end of the second sidewall and the central axis of the first inner shell (2) is greater than the distance between the upper end of the first sidewall and the central axis of the first inner shell (2). The second gas equalization hole (251) is provided on the second sidewall.

6. The oil separator according to claim 5, characterized in that: The second gas equalization structure (25) includes a second gas equalization shell, which covers the end of the air inlet pipe (11) that communicates with the air inlet chamber (23). The second gas equalization shell is shaped like a frustum, and the side wall of the frustum is formed as the second side wall.

7. The oil separator according to claim 1, characterized in that: The oil separator further includes a third gas equalization structure (29), which is disposed within the gas equalization section (26) and is located between the first gas equalization structure (22) and the guide section (27).

8. The oil separator according to claim 1, characterized in that: The flow guide section (27) forms a portion of the first fluid channel (13) between itself and the inner wall of the outer shell (1), and the flow area of ​​the first fluid channel (13) gradually decreases along the fluid flow direction within the first fluid channel (13).

9. The oil separator according to claim 1, characterized in that: The first inner shell (2) has an air passage hole on the side wall of the spacer (14), and a first filter structure (4) is provided at the air passage hole.

10. The oil separator according to claim 1, characterized in that: The bottom of the outer shell (1) has a first oil storage area, the first air outlet (21) is vented towards the first oil storage area, and a first baffle plate (28) is provided between the first air outlet (21) and the first oil storage area.

11. The oil separator according to claim 10, characterized in that: The first baffle plate (28) is provided with a flow guide surface (281), and the fluid in the first air outlet (21) can flow to the inner wall of the outer shell (1) under the guidance of the flow guide surface (281).

12. The oil separator according to claim 1, characterized in that: Along the fluid flow direction within the second fluid channel (15), the flow area of ​​the second fluid channel (15) gradually decreases.

13. The oil separator according to claim 1, characterized in that: The oil separator also includes an exhaust pipe (5), one end of which is connected to the interior of the second inner shell (3), and the other end is connected to the exhaust port (12).

14. The oil separator according to claim 13, characterized in that: The oil separator also includes a second filter structure (6), which is disposed inside the exhaust pipe (5).

15. The oil separator according to claim 13, characterized in that: Part of the exhaust pipe (5) is located inside the second inner shell (3), and a third fluid channel (16) is formed between the exhaust pipe (5) and the inner wall of the second inner shell (3).

16. The oil separator according to claim 15, characterized in that: Along the fluid flow direction within the third fluid channel (16), the flow area of ​​the third fluid channel (16) gradually decreases.

17. The oil separator according to claim 1, characterized in that: The top of the second inner shell (3) is provided with an opening, and the second fluid channel (15) communicates with the interior of the second inner shell (3) through the opening. The bottom of the second inner shell (3) forms a second oil storage area, and a second baffle plate (34) is provided between the opening and the second oil storage area. An oil passage hole is provided on the second baffle plate (34).

18. The oil separator according to claim 1, characterized in that: The second inner shell (3) includes a communicating section (32) and a liquid collecting section (33) that are interconnected. The liquid collecting section (33) is located on the side of the communicating section (32) away from the exhaust port (12). The rate of change of the flow area of ​​the portion of the second fluid channel (15) formed between the liquid collecting section (33) and the inner wall of the outer shell (1) is higher than the rate of change of the flow area of ​​the portion of the second fluid channel (15) formed between the communicating section (32) and the inner wall of the outer shell (1).

19. An air conditioning unit, characterized in that: The oil separator includes any one of claims 1 to 18.

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