Oil separator and heating and ventilation equipment

Abstract

The invention belongs to the technical field of oil separation, and particularly relates to an oil separator and heating and ventilation equipment. The oil separator comprises a main cylinder, the main cylinder is provided with a cylinder wall, a cylinder cavity defined by the cylinder wall, a main air inlet and an air outlet, the main air inlet and the air outlet are communicated with the cylinder cavity, and the main air inlet penetrates through the cylinder wall of the main cylinder; the air inlet pipe is arranged on the cylinder side of the main cylinder and is tangent to the main cylinder, the axial direction of the air inlet pipe intersects with the axial direction of the main cylinder, the air inlet pipe comprises an air inlet port and an air outlet port opposite to the air inlet port, the air inlet port is used for allowing external airflow to flow into the air inlet pipe, and the air outlet port is in butt joint with the main air inlet; along the axial direction of the main cylinder body, the size of the circulation cross section of the air outlet port is L11, the size of the circulation cross section of the air inlet port is L21, and L11 is larger than L21. According to the oil separator, the contact area of airflow and the inner wall of the main barrel can be widened, the contact area can be increased, more oil can be attached to the inner wall of the main barrel, and then the separation effect of the oil separator is improved.

Description

[0001] Priority Information

[0002] This application claims the priority of Chinese Patent Application No. 202311591367.0, titled "Oil Separator and HVAC Equipment", filed on November 24, 2023. The entire content of this application is incorporated herein by reference. Technical Field

[0003] This application belongs to the technical field of oil separation, and specifically relates to an oil separator and HVAC equipment. Background Art

[0004] What is provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0005] The intake pipe of the existing oil separator has a circular tube structure with a consistent pipe diameter. After the air flow enters the barrel cavity of the main barrel of the oil separator, the contact area with the inner wall of the main barrel is small, and less oil adheres to the inner wall of the main barrel, resulting in a good oil-gas separation effect of the oil separator. Summary of the Invention

[0006] The object of the present invention is to at least solve the technical problem of the poor separation effect of the existing oil separator. This object is achieved in the following way:

[0007] The present invention provides an oil separator, comprising: a main barrel, the main barrel having a barrel wall, a barrel cavity surrounded by the barrel wall, a total intake port and an outlet port communicating with the barrel cavity, and the total intake port penetrates through the barrel wall of the main barrel;

[0008] An intake pipe, the intake pipe is arranged on the side of the main barrel and is tangent to the main barrel, the axial direction of the intake pipe intersects with the axial direction of the main barrel, the intake pipe includes an intake port and an outlet port arranged opposite to the intake port, the intake port is used for the external air flow to flow into the intake pipe, the outlet port is docked with the total intake port, along the axial direction of the main barrel, the size of the flow cross-section of the outlet port is L11, and the size of the flow cross-section of the intake port is L21, and L11 is greater than L21.

[0009] According to the oil separator of the present invention, during use, an oil-containing gas is transported into the cylinder cavity through an intake pipe. Since the intake pipe is tangentially arranged with the main cylinder body, the airflow entering from the intake pipe will flow along the inner wall of the main cylinder body, and the oil liquid in the airflow will adhere to the inner wall of the main cylinder body. The airflow flows out from the air outlet, thereby realizing oil-gas separation. Further, along the axial direction of the main cylinder body, the size L11 of the flow cross-section of the air outlet port is larger than the size L21 of the flow cross-section of the intake port, so that the airflow flowing into the cylinder cavity 11 has a larger width. Furthermore, the contact area between the airflow and the inner wall of the main cylinder body will become wider, and the contact area will become larger, so that more oil liquid will adhere to the inner wall of the main cylinder body. Consequently, the separation effect of the oil separator is improved. In addition, the oil separator according to the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the intake pipe includes a first pipe section and a second pipe section that communicate with each other. One end of the first pipe section away from the second pipe section forms an air outlet port, and one end of the second pipe section away from the first pipe section forms an intake port. The size of the flow cross-section of the first pipe section is L1, and the size of the flow cross-section of the second pipe section is L2, and L1 is greater than L2.

[0011] In some embodiments of the present invention, the flow cross-section of the first pipe section is flat, and / or the flow cross-section of the second pipe section is circular.

[0012] In some embodiments of the present invention, the intake pipe further includes a transition pipe section. One end of the transition pipe section is adapted and communicated with the first pipe section, and the other end of the transition pipe section is adapted and communicated with the second pipe section.

[0013] In some embodiments of the present invention, the flow cross-sections of both the first pipe section and the second pipe section are elliptical.

[0014] In some embodiments of the present invention, the area of the flow cross-section of the first pipe section is greater than or equal to the area of the flow cross-section of the second pipe section.

[0015] In some embodiments of the present invention, along the direction from the second pipe section to the first pipe section, the size of the flow cross-section of the first pipe section along the axial direction of the main cylinder body gradually increases.

[0016] In some embodiments of the present invention, the axis of the intake pipe intersects with the axis of the main cylinder body.

[0017] In some embodiments of the present invention, the oil separator further includes at least one cyclone cylinder. The cyclone cylinder is arranged in the cylinder cavity and is spaced from the inner peripheral surface of the main cylinder body. A first swirl channel is formed between the outer peripheral surface of the cyclone cylinder and the inner peripheral surface of the main cylinder body. Through the total intake port, the intake pipe is communicated with the first swirl channel to allow the airflow in the intake pipe to enter the first swirl channel.

[0018] In some embodiments of the present invention, the oil separator further includes a first partition plate and a second partition plate. Along the axial direction of the cylinder cavity, the first partition plate and the second partition plate are arranged at intervals. The first partition plate, the second partition plate, the cyclone cylinder and the cylinder cavity enclose to form the first cyclone channel. The cyclone cylinder is formed with a first opening and a second opening arranged at intervals along its axial direction. The first opening is arranged close to the air outlet. The first partition plate closes the first opening of the cyclone cylinder and encloses with the cyclone cylinder to form the second cyclone channel. The total air inlet is arranged between the first partition plate and the second partition plate.

[0019] In some embodiments of the present invention, along the axial direction of the main cylinder body, the size of the total air inlet is less than or equal to the distance between the first partition plate and the second partition plate.

[0020] The second aspect of the present invention provides a heating and ventilation device, which includes the oil separator according to the first aspect of the present invention.

[0021] The heating and ventilation device provided by the second aspect of the present invention includes the oil separator according to the first aspect of the present invention. Therefore, it also has the beneficial effects of the oil separator.

[0022] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specifically lists the specific embodiments of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0024] Figure 1 Schematically shows a front view of an oil separator provided according to some embodiments of the first aspect of the present invention.

[0025] Figure 2 Schematically shows a front view of the main cylinder body and the air inlet pipe provided according to some embodiments of the first aspect of the present invention.

[0026] Figure 3 Schematically shows a top view of the main cylinder body and the air inlet pipe provided according to some embodiments of the first aspect of the present invention.

[0027] Figure 4 For Figure 3 the A-A cross-sectional view of the main cylinder body and the air inlet pipe shown in

[0028] Figure 5 The Figure 3 B-B sectional view of the main cylinder body and the intake pipe shown in

[0029] Figure 6 The Figure 3 C-C sectional view of the main cylinder body and the intake pipe shown in

[0030] Figure 7 The Figure 6 enlarged view of part F in

[0031] Figure 8 The Figure 3 D-D sectional view of the main cylinder body and the intake pipe shown in

[0032] Figure 9 Schematically shows a perspective view of the main cylinder body and the intake pipe provided according to some embodiments of the first aspect of the present invention (the inlet pipe is inclined).

[0033] Figure 10 Schematically shows a front view of the main cylinder body and the intake pipe provided according to some embodiments of the first aspect of the present invention (the inlet pipe is inclined).

[0034] Figure 11 The Figure 1 E-E sectional view of the oil separator shown in

[0035] Figure 12 Schematically shows a front view of the main cylinder body provided according to some embodiments of the first aspect of the present invention.

[0036] Figure 13 Schematically shows a front view of the separation assembly provided according to some embodiments of the first aspect of the present invention.

[0037] Figure 14 The Figure 13 G-G sectional view of the separation cone shown in

[0038] Figure 15 Schematically shows a perspective view of the separation assembly provided according to some embodiments of the first aspect of the present invention.

[0039] Figure 16 Schematically shows a perspective view of the separation assembly provided according to some embodiments of the first aspect of the present invention (with Figure 15 a different placement angle from the separation assembly in

[0040] Figure 17 Schematically shows a perspective view of the cyclone cylinder, the second partition plate, the guide cylinder and the conical cylinder provided according to some embodiments of the first aspect of the present invention.

[0041] Figure 18 Schematically shows a perspective view of a cyclone tube, a second partition plate, a draft tube and a conical tube provided according to some embodiments of the first aspect of the present invention (with Figure 17 different placement angles).

[0042] Figure 19 Schematically shows a top view of a cyclone tube, a second partition plate, a draft tube and a conical tube provided according to some embodiments of the first aspect of the present invention.

[0043] Figure 20 Schematically shows a perspective view of a first partition plate and a gas return tube provided according to some embodiments of the first aspect of the present invention.

[0044] Figure 21 Schematically shows a front view of a cyclone tube, a second partition plate, a draft tube and a conical tube provided according to some embodiments of the first aspect of the present invention.

[0045] Figure 22 is Figure 21 the H-H sectional view of the cyclone tube, the second partition plate, the draft tube and the conical tube shown in

[0046] Figure 23 Schematically shows a perspective view of a cyclone tube, a second partition plate, a draft tube and a conical tube provided according to some embodiments of the first aspect of the present invention.

[0047] Figure 24 Schematically shows a top view of a flow tube, a second partition plate, a draft tube and a conical tube provided according to some embodiments of the first aspect of the present invention.

[0048] The reference numerals in the drawings are represented as follows:

[0049] 1, oil separator;

[0050] 10, main cylinder body; 11, cylinder cavity; 12, total air inlet; 13, air outlet; 14, total oil drain port; 15, cylindrical section; 16, first conical section; 17, second conical section; 18, first connecting pipe; 19, second connecting pipe; 101, first cyclone channel; 102, second cyclone channel; 104, gas return pipe; 105, oil delivery pipe; 106, air supply pipe;

[0051] 103, air inlet pipe; 1031, first pipe section; 1032, second pipe section; 1033, transition pipe section; 1034, straight part; 1035, arc part; 1036, air inlet port; 1037, air outlet port;

[0052] 20, cyclone tube; 21, first opening; 22, second opening; 23, side opening; 24, arc-shaped guiding part;

[0053] 30. First partition board; 31. Air return hole;

[0054] 40. Second partition board; 41. Through hole; 42. Arc-shaped plate; 43. Oil return notch; 44. Second oil return hole;

[0055] 50. Air return cylinder;

[0056] 60. Conical cylinder; 61. Oil discharge port;

[0057] 70. Flow guide cylinder;

[0058] 80. Fixing part; 81. Corner hole; 82. Central hole. Detailed implementation mode

[0059] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0060] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing" and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0061] Although the terms first, second, third, etc. may be used in the text to describe multiple elements, components, regions, layers, and /

[0062] or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below may be referred to as the second element, component, region, layer or section without departing from the teachings of the exemplary embodiments.

[0063] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. Such relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "over" other elements or features. Thus, the exemplary term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.

[0064] Combined Figures 1 to 10 As shown in combination, in some embodiments of the first aspect of the present invention, the oil separator 1 includes a main cylinder 10 and an intake pipe 103. The main cylinder 10 has a cylinder wall, a cylinder cavity 11 surrounded by the cylinder wall, a total intake port 12 and an outlet port 13 communicating with the cylinder cavity 11, and the total intake port 12 penetrates through the cylinder wall of the main cylinder 10. The intake pipe 103 is disposed on the side of the main cylinder 10 and is tangent to the main cylinder 10. The axial direction of the intake pipe 103 intersects with the axial direction of the main cylinder 10. The intake pipe 103 includes an intake port 1036 and an outlet port 1037 disposed opposite to the intake port 1036 ( Figure 3 as shown in), the intake port 1036 is for allowing an external air flow to flow into the intake pipe 103, the outlet port 1037 is docked with the total intake port 12. Along the axial direction of the main cylinder 10, the size of the flow cross-section of the outlet port 1037 is L11, and the size of the flow cross-section of the intake port 1036 is L21, and L11 is greater than L21. In one embodiment, the axial direction of the intake pipe 103 is perpendicular to the axial direction of the main cylinder 10.

[0065] According to the oil separator 1 of the present invention, in use, an oil-containing gas is transported into the cylinder cavity 11 through the air inlet pipe 103. Since the air inlet pipe 103 is tangentially arranged with the main cylinder body 10, the air flow entering from the air inlet pipe 103 will flow along the inner wall of the main cylinder body 10, and the oil liquid in the air flow will adhere to the inner wall of the main cylinder body 10. Then the air flow flows out from the air outlet 13, thereby realizing oil-gas separation. In the present invention, along the axial direction of the main cylinder body 10, the size L11 of the flow cross-section of the air outlet port 1037 is larger than the size L21 of the flow cross-section of the air inlet port 1036, so that the air flow flowing into the cylinder cavity 11 has a larger width. Furthermore, the contact area between the air flow and the inner wall of the main cylinder body 10 will become wider, and the contact area will become larger, so that more oil liquid will adhere to the inner wall of the main cylinder body 10. Furthermore, the separation effect of the oil separator 1 is improved. In this application, the width of the air flow refers to the size of the air flow in the axial direction of the main cylinder body 10.

[0066] The air inlet pipe 103 includes an air inlet port 1036 and an air outlet port 1037 arranged oppositely along its axial direction. The air inlet port 1036 is docked with the total air inlet 12 of the main cylinder body 10. The shapes and sizes of the air inlet port 1036 and the total air inlet 12 are the same. Docking includes the meaning of sealed connection, that is, the air inlet port 1036 of the air inlet pipe 103 is hermetically connected and communicated with the total air inlet 12 of the main cylinder body 10.

[0067] The air inlet pipe 103 includes a first pipe section 1031 and a second pipe section 1032 that are communicated with each other. One end of the first pipe section 1031 away from the second pipe section 1032 forms an air outlet port, and one end of the second pipe section 1032 away from the first pipe section 1031 forms an air inlet port 1036. Along the axial direction of the main cylinder body 10, the size of the flow cross-section of the first pipe section 1031 is L1, and the size of the flow cross-section of the second pipe section 1032 is L2, and L1 is greater than L2. L1 refers to the size of the flow cross-section of any position of the first pipe section 1031 along the axial direction of the main cylinder body. L2 refers to the size of the flow cross-section of any position of the second pipe section 1032 along the axial direction of the main cylinder body. At the position of the air outlet port 1037 of the first pipe section 1031, L1 = L11, and at the position of the air inlet port 1036 of the second pipe section 1032, L2 = L21. It can be understood that L1 represents the width of the air flow in the first pipe section 1031, and L2 represents the width of the air flow in the second pipe section 1032. Since L1 is greater than L2, the width of the air flow at any position in the first pipe section 1031 is greater than the width of the air flow at any position on the second pipe section 1032. Therefore, the air flow entering the total air inlet 12 from the first pipe section 1031 is also wider. Thus, the contact area between the air flow and the inner wall of the main cylinder body 10 is larger, and the separation effect of the oil separator 1 is better.

[0068] The first pipe section 1031 of the intake pipe 103 is closer to the total intake port 12 of the main cylinder body 10 than the second pipe section 1032. The axis of the first pipe section 1031 coincides with the axis of the second pipe section 1032, that is, the first pipe section 1031 and the second pipe section 1032 are coaxially arranged. The first pipe section 1031 includes an air outlet port 1037 and an inner intake port arranged opposite to the air outlet port 1037 along the axial direction of the intake pipe 103. The second pipe section 1032 includes an intake port 1036 and an inner air outlet port 1037 arranged opposite to the intake port 1036 along the axial direction of the intake pipe 103. The inner air outlet of the second pipe section 1032 is communicated with the inner intake port of the first pipe section 1031. In some embodiments, the inner air outlet and the inner intake port are directly docked to achieve the communication between the first pipe section 1031 and the second pipe section 1032, or the inner air outlet and the inner intake port can be communicated through the following transition pipe section, so that the air flow flowing out of the inner air outlet of the second pipe section 1032 flows into the inner intake port of the first pipe section 1031. In one embodiment, the first pipe section 1031 and the second pipe section 1032 are of an integral structure, so that the intake pipe 103 can be integrally manufactured by injection molding or casting.

[0069] In one embodiment, the flow cross-section of the first pipe section 1031 is flat, and the flow cross-section of the second pipe section 1032 is circular. In this way, along the axial direction of the main cylinder body 10, the size L1 of the flow cross-section of the first pipe section 1031 can be greater than the size L2 of the flow cross-section of the second pipe section 1032. A flat shape is a structure in which the dimensions in two mutually perpendicular directions of the flow cross-section are different. In one embodiment of the present invention, the flat shape is arranged with its long side parallel to the axial direction of the main cylinder body 10. The flat shape includes polygons or trapezoids, etc. In one embodiment, the flow cross-section of the first pipe section 1031 is rectangular, and the long side of the rectangle is parallel to the axial direction of the main cylinder body 10. In some embodiments, the outer shape of the first pipe section 1031 is also flat, specifically, it can be a rectangular pipe, and the outer shape of the second pipe section 1032 is a circular pipe, so as to match the flow cross-sections inside the first pipe section 1031 and the second pipe section 1032 respectively.

[0070] The oil separator 1 further includes an air delivery pipe 106, and the air delivery pipe 106 is communicated with the second pipe section 1032. Specifically, the air delivery pipe 106 includes an intake side and an outlet side. The outlet side is docked with the intake port 1036 of the second pipe section 1032, and the intake side is connected to the exhaust pipe of the compressor. The air delivery pipe 106 is used to deliver the high-temperature and high-pressure gas output by the compressor into the oil separator 1. Since the air delivery pipe 106 is usually circular, the second pipe section 1032 being a circular pipe facilitates docking with the air delivery pipe 106.

[0071] In one embodiment, the flow cross-section of the first pipe section 1031 is a first ellipse, and the flow cross-section of the second pipe section 1032 is a second ellipse. The major axes of the first ellipse and the second ellipse are both parallel to the axis of the main cylinder 10. The eccentricity e1 of the first ellipse is greater than the eccentricity e2 of the second ellipse. The larger the eccentricity of the ellipse, the flatter it is. Thus, it can be achieved that: along the axial direction of the main cylinder 10, the size L1 of the flow cross-section of the first pipe section 1031 is greater than the size L2 of the flow cross-section of the second pipe section 1032. That is to say, the flow cross-sections of both the first pipe section 1031 and the second pipe section 1032 can be ellipses. As long as the first ellipse is flatter than the second ellipse in the axial direction of the main cylinder, it can also be achieved that along the axial direction of the main cylinder 10, the size L1 of the flow cross-section of the first pipe section 1031 is greater than the size L2 of the flow cross-section of the second pipe section 1032.

[0072] In one embodiment, the flow cross-section of the first pipe section 1031 is an ellipse, and the major axis of the ellipse is parallel to the axis of the main cylinder 10. The flow cross-section of the second pipe section 1032 is a circle. Similarly, it can be achieved that along the axial direction of the main cylinder 10, the size L1 of the flow cross-section of the first pipe section 1031 is greater than the size L2 of the flow cross-section of the second pipe section 1032. That is, the first pipe section 1031 is a flat pipe, and the second pipe section 1032 is a circular pipe.

[0073] Please refer to Figure 9 , the axial end face where the air outlet port 1037 of the first pipe section 1031 is located includes a straight portion 1034 and two arc portions 1035. The two arc portions 1035 are parallel to each other and are located at both ends of the straight portion 1034, and each arc portion 1035 fits with the arc of the outer peripheral wall of the main cylinder 10. The first pipe section 1031 is tangentially connected to the main cylinder 10 through the two arc portions 1035. The first pipe section 1031 is tangentially arranged with the main cylinder 10, which can make the air flow rotate as close as possible to the inner wall of the main cylinder 10 after flowing into the main cylinder 10, so that the air flow can better contact the inner peripheral surface of the main cylinder 10, and improve the oil-gas separation effect of the oil separator 1. Figure 9 According to the installation position of the intake pipe 103 shown in, it can be achieved that after the air flow flows into the cylinder cavity 11 from the total intake port 12 of the main cylinder 10, it rotates clockwise along the inner peripheral wall of the main cylinder 10 in the cylinder cavity 11. It can be understood that by adjusting the position of the intake pipe 103, the air flow can rotate counterclockwise along the inner peripheral wall of the main cylinder 10 in the cylinder cavity 11.

[0074] In one embodiment, in the direction from the inner air inlet of the first pipe section 1031 to the air outlet port 1037, the size L1 of the flow cross-section of the first pipe section 1031 along the axis of the main cylinder 10 gradually increases. This makes the value of the size L11 of the flow cross-section at the air outlet port 1037 of the first pipe section 1031 along the axis of the main cylinder 10 the largest, that is, the airflow at the air outlet port 1037 is the widest, so that the airflow in the intake pipe 103 flows into the main cylinder 10 with the largest width. Since the intake pipe 103 is tangent to the main cylinder 10, after the airflow flows into the main cylinder 10, it flows along the inner wall of the main cylinder 10. The airflow entering from the total air inlet 12 is wider, the contact area with the inner wall of the main cylinder 10 will become wider, and the contact area will become larger, so that more oil will adhere to the inner wall of the main cylinder 10. Furthermore, the separation effect of the oil separator 1 is improved. In one embodiment, in the direction from the air inlet port 1036 of the second pipe section 1032 to the inner air outlet, the size L2 of the flow cross-section of the second pipe section 1032 along the axis of the main cylinder remains unchanged, that is, the second pipe body 1032 is an overall straight circular pipe with an unchanged inner diameter and outer diameter.

[0075] The intake pipe 103 further includes a transition pipe section 1033, and the transition pipe section 1033 is directly connected between the first pipe section 1031 and the second pipe section 1032. The transition pipe section 1033 includes a first port and a second port arranged in opposite directions along its axis. Among them, the first port is docked with the inner air inlet of the first pipe section 1031, and the second port is docked with the inner air outlet of the second pipe section 1032. The transition pipe section 1033 further includes a pipe cavity connecting the first port and the second port. The first pipe section 1031 and the second pipe section 1032 are connected through the pipe cavity of the transition pipe section 1033.

[0076] When the flow cross-section of the first pipe section 1031 is rectangular and the flow cross-section of the second pipe section 1032 is circular, the flow cross-section at the first port of the transition pipe section 1033 is rectangular, and the flow cross-section at the second port is circular. In the direction from the second port to the first port, the flow cross-section of the transition pipe section 1033 gradually changes from circular to rectangular. In this way, it can be avoided that a stepped surface is formed on the inner surface of the transition pipe section 1033, resulting in the obstruction of the airflow in the transition pipe section 1033. In one embodiment, in the direction from the second port to the first port, the outer shape of the transition pipe section 1033 also gradually changes from circular to rectangular. The inner surface and the outer surface of the intake pipe 103 are both smooth surfaces through the transition pipe section 1033.

[0077] Axially along the main cylinder body 10, the size of the flow cross-section at any position on the transition pipe section 1033 can be denoted by L3. Specifically, at the first port, L3 = L1, and at the second port, L3 = L2. In one embodiment, in the direction from the second port to the first port, axially along the main cylinder body 10, the size L3 of the flow cross-section of the transition pipe section 1033 gradually increases, gradually increasing from L2 to L1. Thus, the inner surface of the transition pipe section 1033 can be smoothly connected to the first pipe section 1031 and the second pipe section 1032, and no protrusions will be formed on the inner wall of the intake pipe 103 to hinder the flow of air in the intake pipe 103. In one embodiment, the first pipe section 1031, the second pipe section 1032, and the transition pipe section 1033 are of an integral structure, so that the intake pipe 103 can be prepared by injection molding or casting.

[0078] In one embodiment, the area of the flow cross-section of the first pipe section 1031 is greater than or equal to the area of the flow cross-section of the second pipe section 1032, that is, the area of the fluid cross-section at any position of the first pipe section 1031 is greater than or equal to the area of the flow cross-section at any position of the second pipe section 1032. This can ensure that when L1 is greater than L2, from the second pipe section 1032 to the first pipe section 1031, the flow cross-section will not become smaller, and the flow rate of the air flow will not decrease due to the reduction of the flow cross-section, resulting in a decrease in the intake air volume of the oil separator 1 and a deterioration of the oil separation effect. In one embodiment, in the direction from the intake port 1036 to the outlet port 1037 of the intake pipe 103, the size of the flow cross-section of the intake pipe 103 along the axis of the main cylinder body 10 gradually increases, which makes the intake pipe 103 as a whole an expanding structure, with its inner surface being a smooth surface, the air flow is not hindered, and the air flow rate will not decrease.

[0079] The axis of the intake pipe 103 intersects with the axis of the main cylinder body 10. In one embodiment, the axis of the intake pipe 103 is perpendicular to the axis of the main cylinder body 10. Thus, the air flow flowing into the main cylinder body 10 from the intake pipe 103 will rotate better along the inner wall of the main cylinder body 10. And under the rotation trend of the air flow, the air flow will rotate in the first swirl channel, and it is not easy to flow downward from the oil return hole on the second partition plate 40. In one embodiment, the axis of the intake pipe 103 is inclined with respect to the axis of the main cylinder body 10, so that the air flow can have an upward or downward component velocity after entering the main cylinder body 10. Please refer to Figure 9 and Figure 10 , the intake pipe 103 is inclined downward with respect to the main cylinder body 10, so that the air flow can be controlled to have an upward component velocity after entering the main cylinder body 10. The air flow will circulate as much as possible in the first swirl channel 101, and it is also not easy to flow downward from the oil return hole on the second partition plate 40, so that the function of the oil return hole is only used for oil return, and the air flow will not directly flow out from the oil return hole without passing through the oil-gas separation of the first swirl channel 101 and the second swirl channel 102.

[0080] Please refer to Figure 11 and Figure 12 As shown in Figure 11 and Figure 12 , the main cylinder body 10 includes a cylindrical section 15, a first conical section 16 and a second conical section 17 located at both axial ends of the cylindrical section 15, as well as a first connecting pipe 18 and a second connecting pipe 19. The cylindrical section 15, the first conical section 16, the second conical section 17, the first connecting pipe 18 and the second connecting pipe 19 enclose to form a cylindrical cavity 11 of the main cylinder body 10. In one embodiment, the main cylinder body 10 is an integral structure, and the main cylinder body 10 can be prepared by a spinning forming method. The main cylinder body 10 includes a total air inlet 12, and the total air inlet 12 is arranged on the outer peripheral surface of the cylindrical section 15 and communicates with the cylindrical cavity 11.

[0081] For a clearer explanation of the present invention, the axial direction of the main cylinder body 10 is defined as the up and down direction, and the side where the air outlet 13 is located is defined as the upper side, and the side where the total oil drain port 14 is located is defined as the lower side.

[0082] The cylindrical section 15 includes an upper opening and a lower opening arranged at intervals along its axial direction. The first conical section 16 includes a large-diameter opening and a small-diameter opening, wherein the large-diameter opening is butted against the upper opening of the cylindrical section 15. The butt joint means sealed connection, that is, the large-diameter opening of the first conical section 16 is sealedly connected and communicated with the upper opening of the cylindrical section 15. The small-diameter opening is butted against the lower port of the first connecting pipe 18. The upper port of the first connecting pipe 18 is the air outlet 13. The second conical section 17 includes a large-diameter opening and a small-diameter opening, wherein the large-diameter opening is butted against the lower opening of the cylindrical section 15, and the small-diameter opening is butted against the upper port of the second connecting pipe 19. The lower port of the second connecting pipe 19 is the total oil drain port 14. The total air inlet 12, the total oil drain port 14 and the air outlet 13 are all communicated with the cylindrical cavity 11.

[0083] The functions of the first conical section 16 and the second conical section 17 are both to reduce the diameter, so that the diameter of the small-diameter opening of the first conical section 16 matches the diameter of the return air pipe 104 outside the main cylinder body 10 for easy connection with each other, and the diameter of the small-diameter opening of the second conical section 17 matches the diameter of the oil delivery pipe 105 outside the main cylinder body 10 for easy connection with each other. The function of the first connecting pipe 18 is to be inserted into the return air pipe 104 outside the main cylinder body 10 to achieve communication, and the function of the second connecting pipe 19 is to be inserted into the oil delivery pipe 105 outside the main cylinder body 10 to achieve communication.

[0084] A first partition plate 30, a reflux cylinder, a swirl cylinder 20, a second partition plate 40, a guide cylinder 70 and a conical cylinder 60 are sequentially arranged in the cylindrical cavity 11 from top to bottom. The first partition plate 30, the reflux cylinder, the swirl cylinder 20, the second partition plate 40, the guide cylinder 70 and the conical cylinder 60 form a separation assembly. Further, Figures 4 to 7A separation component is shown. The separation component is a collection of internal components of the main cylinder body 10, and the function of the separation component is to define all the oil-gas separation channels within the cylinder cavity 11.

[0085] Please refer to Figures 13 to 19 , the cyclone cylinder 20 is arranged within the cylinder cavity 11 of the main cylinder body 10 and is spaced apart from the inner wall of the cylinder cavity 11. The axial direction of the cyclone cylinder 20 is parallel to the axial direction of the main cylinder body 10. Specifically, the cyclone cylinder 20 is arranged within the cylindrical section 15. The axial dimension L1 of the cyclone cylinder 20 is less than the axial dimension L2 of the main cylinder body 10. The number of cyclone cylinders 20 is at least one. For example, the number of cyclone cylinders 20 can be 1, 2, 3, 5, 6, 7, or 8. In one embodiment, the number of cyclone cylinders 20 is 4. The 4 cyclone cylinders 20 are arranged in a ring. It can be understood that when the number of cyclone cylinders 20 is multiple, the multiple cyclone cylinders 20 can be arranged in a ring and spaced apart from the inner peripheral surface of the cylinder cavity 11. The ring arrangement can enable each cyclone cylinder 20 to be adjacent to the first swirl channel 101, and can enable each cyclone cylinder 20 to communicate with the first swirl channel 101. Within the cylinder cavity 11, the multiple cyclone cylinders 20 are arranged adjacent to each other and are located in the middle region of the cylinder cavity 11. In this way, the space of the first swirl channel 101 can be made as large as possible. Adjacent cyclone cylinders 20 can be arranged to overlap each other or be spaced apart.

[0086] The cyclone cylinder 20 includes a first opening 21 and a second opening 22 arranged oppositely along its axial direction. Specifically, the first opening 21 is located at the upper end, and the second opening 22 is located at the lower end. The spiral cyclone cylinder 20 further includes a side opening 23 located between the first opening 21 and the second opening 22. The side opening 23 of each cyclone cylinder 20 is arranged towards the first swirl channel 101, so that the air flow within the first swirl channel 101 can flow into the cyclone cylinder 20 through the side opening 23. In one embodiment, the side opening 23 extends from the side of the first opening 21 to the side of the second opening 22 along the axial direction of the main cylinder body 10. In one embodiment, there is a certain distance between the upper end of the side opening 23 and the first opening 21, and there is a certain distance between the lower end of the side opening 23 and the second opening 22, and the side opening 23 does not communicate the first opening 21 and the second opening 22.

[0087] The shape of the cyclone cylinder 20 is not limited, and the radial cross-section of the cyclone cylinder 20 can be circular or polygonal. In one embodiment, the cyclone cylinder 20 is a spiral cylinder, that is, the radial cross-section of the cyclone cylinder 20 is spiral. In one embodiment, the cyclone cylinder 20 rotates counterclockwise from the inside to the outside, that is, the inner cylinder wall of the cyclone cylinder 20 rotates counterclockwise to the outer cylinder wall, and the side opening 23 is the gap between the inner cylinder wall and the outer cylinder wall of the cyclone cylinder 20. Please refer to Figure 11, the outermost cylindrical wall of the spiral-shaped cyclone tube 20 is defined as an arc-shaped diversion part 24. The arc-shaped diversion part 24 is tangentially arranged with the first spiral channel 101. Therefore, the arc-shaped diversion part 24 has the function of guiding the air flow into the side opening 23, which can make as much air flow in the first spiral channel 101 flow into the cyclone tube 20 as possible. At the same time, the arc-shaped diversion part 24 increases the area of the inner peripheral surface of the cyclone tube 20, so that the air flow contacts with the inner peripheral surface of the cyclone tube 20 with a larger area. Furthermore, more oil droplets in the air flow adhere to the inner peripheral surface of the cyclone tube 20, making the oil-gas separation effect of the cyclone tube 20 better.

[0088] In one embodiment, the cyclone tube 20 is a cylinder with a side opening 23 formed on its outer peripheral surface, and the radial cross-section of the cyclone tube 20 is an arc. In one embodiment, the circular angle of the arc is greater than or equal to 270 degrees and less than or equal to 355 degrees. The notch of the arc extends along the axial direction of the main cylinder body 10 to form the side opening 23. In another embodiment, the cyclone tube 20 is a square tube with a side opening 23 formed on its outer peripheral surface.

[0089] The oil separator 1 further includes an air inlet pipe 103 for delivering the oil-containing air flow into the cylinder cavity 11. The air inlet pipe 103 is tangentially arranged with the outer peripheral surface of the main cylinder body 10. After the air flow enters the first spiral channel 101 from the air inlet pipe 103, it rotates in the first spiral channel 101. By controlling the position of the air inlet pipe 103, the air flow can rotate clockwise or counterclockwise after entering the first spiral channel 101. In one embodiment, the air flow rotates clockwise in the first spiral channel 101. In order to facilitate the air flow to enter the cyclone tube 20, the side opening 23 of the spiral tube is arranged facing the air flow. Specifically, the cylindrical wall of the spiral-shaped cyclone tube 20 is arranged to rotate counterclockwise from the inside to the outside. In this way, the spiral direction of the first spiral channel 101 is the same as that of the second spiral channel 102, and the air flow in the first spiral channel 101 will flow into the second spiral channel 102 as much as possible.

[0090] In one embodiment, the air flow rotates counterclockwise in the first spiral channel 101, and the cylindrical wall of the spiral-shaped cyclone tube 20 is arranged to rotate clockwise from the inside to the outside. The spiral direction of the first spiral channel 101 is the same as that of the second spiral channel 102. Similarly, the side opening 23 of the spiral cyclone tube 20 can be arranged facing the air flow, so that the air flow can flow into the cyclone tube 20 as much as possible.

[0091] Please refer to Figures 13 to 24, the oil separator 1 includes a first partition plate 30 and a second partition plate 40, both of which are disposed in the cylinder cavity 11. Along the axial direction of the cylinder cavity 11, the first partition plate 30 and the second partition plate 40 are spaced apart. Specifically, the first partition plate 30 is located at the upper end and the second partition plate 40 is located at the lower end. In one embodiment, both the first partition plate 30 and the second partition plate 40 are disposed in the cylindrical section 15 of the main cylinder body 10, and both the first partition plate 30 and the second partition plate 40 are circular plates. The first partition plate 30 covers the upper side of the first opening 21 of the cyclone cylinder 20, and the second partition plate 40 is connected to the lower side of the second opening 22 of the cyclone cylinder 20. Therefore, the first partition plate 30, the second partition plate 40, the inner peripheral surface of the main cylinder body 10 and the outer peripheral surface of the cyclone cylinder 20 enclose and form a first cyclone channel 101. The first partition plate 30 and the second partition plate 40 respectively close the upper and lower openings of the first cyclone channel 101, so that the air flow in the first cyclone channel 101 can only flow into the second cyclone channel 102. The first partition plate 30 also closes the first opening at the upper end of the cyclone cylinder 20, so that the air flow in the cyclone cylinder 20 can only swirl and flow downward after swirling in the cyclone cylinder 20.

[0092] At least one through hole 41 is formed in the second partition plate 40. The number of through holes 41 is the same as the number of cyclone cylinders 20, and the through holes 41 correspond to the cyclone cylinders 20 one by one. The through hole 41 is docked with the second opening 22 of the cyclone cylinder 20. In this way, through the through hole 41 of the second partition plate 40, the second opening 22 of the cyclone cylinder 20 is not blocked, and the air flow in the cyclone cylinder 20 can flow out through the second opening 22 after swirling in the cyclone cylinder 20.

[0093] In one embodiment, the cyclone cylinder 20 is a spiral cylinder, and the second opening 22 of the cyclone cylinder 20 is a spiral hole, which includes a circular hole portion and an arc hole portion. The arc hole portion is disposed inside the arc-shaped guide portion 24. The arc hole portion is a quasi-triangular hole formed by two arc sides and a straight side. In one embodiment, the through hole 41 of the second partition plate 40 is circular and is only docked with the circular hole portion of the second opening 22 of the cyclone cylinder 20. The arc hole portion of the second opening 22 is blocked by the second partition plate 40, and the part of the second partition plate 40 that blocks the arc hole portion is defined as an arc plate 42. The arc plate 42 helps to guide the air flow into the interior of the cyclone cylinder 20 and plays a role in guiding the flow. The arc plate 42 also plays a role in fixing the cyclone cylinder 20 to the second partition plate 40. The lower end of the arc-shaped guide portion 24 of the cyclone cylinder 20 is connected to the second partition plate 40, which also plays a role in fixing the cyclone cylinder 20 to the second partition plate 40.

[0094] Please refer to Figures 15 to 24, in one embodiment, an oil return hole is formed in the second partition plate 40. The oil return hole is directly communicated with the total oil discharge port 14 of the oil separator 1. Through the oil return hole, after the gas flow in the first swirl channel 101 undergoes oil-gas separation, the oil adhering to the inner wall of the first swirl channel 101 can directly flow into the oil return hole, and after flowing out of the oil return hole, it then flows out through the total oil discharge port 14 of the oil separator 1. The oil return hole axially penetrates the second partition plate 40 along the main cylinder body 10.

[0095] The oil return hole includes a first oil return hole and / or a second oil return hole 44. The first oil return hole is arranged on the outer peripheral surface of the second partition plate 40. At least one oil return notch 43 is formed on the outer peripheral surface of the second partition plate 40, and the oil return notch 43 and the inner peripheral surface of the main cylinder body 10 enclose to form the first oil return hole. In one embodiment, the second partition plate includes a plurality of oil return notches 43, and the plurality of oil return notches 43 are arranged at intervals along the outer peripheral surface of the second partition plate 40.

[0096] The second oil return hole 44 is arranged on the plate surface of the second partition plate 40, and the plate surface is perpendicular to the axis of the main cylinder body 10. The second oil return hole 44 is arranged in the area corresponding to the outer side of the side opening 23 of the swirl cylinder 20, and the second oil return hole 44 is arranged opposite to the side opening 23, so that the second oil return hole 44 is communicated with the side opening 23. In this embodiment, the number of the second oil return holes 44 is 4, and the 4 second oil return holes 44 are respectively arranged in the areas outside the side openings 23 of the 4 swirl cylinders 20. In one embodiment, a plurality of second oil return holes 44 can be formed in the area outside the side opening 23 of each swirl cylinder 20.

[0097] Compared with the second oil return hole 44, the first oil return hole is arranged closer to the inner peripheral surface of the main cylinder body 10. Therefore, the oil liquid accumulated in the first swirl channel 101 is more likely to flow out from the first oil return hole. The second oil return hole 44 is arranged outside the side opening 23 of the swirl cylinder 20 and is communicated with the side opening 23. Therefore, the oil liquid in both the first swirl channel 101 and the second swirl channel 102 can flow out from the second oil return hole 44.

[0098] Please refer to Figures 12 to 19, the oil separator 1 further includes at least one gas return cylinder 50. The gas return cylinder 50 has a straight cylinder structure with both upper and lower ends open. The axis of the gas return cylinder 50 is parallel to the axis of the main cylinder body 10. The gas return cylinder 50 is communicated with the air outlet 13, and the gas return cylinder 50 corresponds to the swirl cylinder 20 one by one and the gas return cylinder 50 is arranged inside the swirl cylinder 20. The number of gas return cylinders 50 is equal to the number of swirl cylinders 20. In one embodiment, the number of gas return cylinders 50 can be 1, 2, 3, 5, 6, 7 or 8. In this embodiment, both the gas return cylinder 50 and the swirl cylinder 20 are 4. The gas return cylinder 50 corresponds to the swirl cylinder 20 one by one, and one gas return cylinder 50 is arranged inside each swirl cylinder 20. Thus, the swirling air flow inside the swirl cylinder 20 can flow in from the lower end opening of the gas return cylinder 50 and flow out from the upper end opening of the gas return cylinder 50. The upper end opening of the gas return cylinder 50 is communicated with the air outlet 13. It can be understood that when the gas return cylinder 50 is inserted into the swirl cylinder 20, the second swirl channel 102 inside the swirl cylinder 20 is improved from a cylindrical shape to an annular channel, which increases the area of the inner surface of the second swirl channel 102, and makes the air flow contact with the inner surface of the swirl cylinder 20 and the outer surface of the gas return cylinder 50 simultaneously during the swirling process in the second swirl channel 102. The air flow will adhere to both the inner surface of the swirl cylinder 20 and the outer surface of the gas return cylinder 50, and the oil separation effect of the second swirl channel 102 is further improved.

[0099] The lower end of the gas return cylinder 50 is lower than the upper surface of the second partition plate 40, which avoids the air flow inside the swirl cylinder 20 flowing directly into the lower end opening of the gas return cylinder 50 without swirling inside the swirl cylinder 20 and flowing out of the oil separator 1 from the air outlet 13, resulting in a poor oil separation effect of the swirl cylinder 20. In one embodiment, the distance between the lower end of the gas return cylinder 50 and the upper surface of the second partition plate 40 is greater than 3 mm, that is, the lower end of the gas return cylinder 50 is at least 3 mm lower than the upper surface of the second partition plate 40. In one embodiment, the lower end of the gas return cylinder 50 is 4 mm, 5 mm or 6 mm lower than the upper surface of the second partition plate 40. This can ensure that the air flow inside the swirl cylinder 20 rotates sufficiently in the second swirl channel 102 for oil-gas separation before flowing into the lower end opening of the gas return cylinder 50, so that the oil-gas separation effect of the second swirl channel 102 is better.

[0100] At least one air return hole 31 is formed on the first partition plate 30, and the air return hole 31 communicates with the total air return hole 31 through the cylinder cavity 11. The number of the air return holes 31 is equal to the number of the air return cylinders 50. The air return holes 31 and the air return cylinders 50 are in one-to-one correspondence. Each air return cylinder 50 corresponds to an air return hole 31. The air return hole 31 is butt-jointed with the upper end opening of the air return cylinder 50. In one embodiment, the air return hole 31 is hermetically connected to the outer peripheral surface of the air return cylinder 50, and the air return cylinder 50 can extend out of the air return hole 31 and extend to the upper end of the air return hole 31. In this way, the first partition plate 30 cannot close the upper end opening of the air return cylinder 50, so that the upper end opening of the air return cylinder 50 can communicate with the air outlet 13 of the oil separator 1, and the air flow in the air return cylinder 50 can flow out through its upper end opening and then flow out of the oil separator 1 through the air outlet 13. It can be understood that during the process of the air flow flowing out of the air return cylinder 50, the air flow will also contact the inner wall of the air return cylinder 50, and the oil droplets in the air flow will adhere to the inner wall of the air return cylinder 50. Therefore, the air return cylinder 50 also has the function of oil-gas separation. The oil droplets adhering to the inner wall of the air return cylinder 50 can drip from the inner wall of the air return cylinder 50, fall into the conical cylinder 60 below the air return cylinder 50, and flow out from the oil discharge port 61 of the conical cylinder 60 and then flow out from the total oil return port of the total oil separator 1. In one embodiment, the first partition plate 30 and the air return cylinder 50 are of an integral structure. In this way, the first partition plate 30 and the air return cylinder 50 can be integrally processed by injection molding or casting, etc., saving the preparation process and reducing the cost.

[0101] Please refer to Figure 17 , the oil separator 1 further includes a fixing member 80. The fixing member 80 is connected to the outer peripheral surface of the swirl cylinder 20 and is disposed close to the first opening 21 of the swirl cylinder 20. When there are at least two swirl cylinders 20, the fixing member 80 is disposed between at least two swirl cylinders 20, and the fixing member 80 is fixedly connected to the outer peripheral surface of each swirl cylinder 20. The plurality of swirl cylinders 20 can be fixedly connected by the fixing member 80. Fixing holes are formed on the upper surface of the fixing member 80, and fixing protrusions (not shown in the figure) are provided on the lower surface of the first partition plate 30. When the first partition plate 30 covers the upper side of the first opening 21 of the swirl cylinder 20, the fixing protrusions on the lower surface of the first partition plate 30 are inserted into the fixing holes, thereby positioning the first partition plate 30 and the swirl cylinder 20, which is convenient for installing the first partition plate 30 in place during the manufacturing process. It can be understood that the number of the fixing holes is at least one.

[0102] In one embodiment, the number of the fixing holes is five, which includes four corner holes 81 and one center hole 82. Correspondingly, the number of the fixing protrusions is also five, which includes four corner protrusions (not shown in the figure) and one center protrusion (not shown in the figure). The four corner protrusions are respectively inserted into the four corner holes 81, and the center protrusion is inserted into the center hole 82. In one embodiment, the fixing member 80 can also extend from the side of the first opening 21 to the side of the second opening 22.

[0103] Please refer to Figures 11 to 19 and Figures 21 to 24 The oil separator 1 further includes at least one conical cylinder 60. The axis of the conical cylinder 60 is parallel to the axis of the main cylinder body 10. The conical cylinder 60 includes an air inlet and an oil drain port 61. The diameter of the air inlet is larger than that of the oil drain port 61. The air inlet of the conical cylinder 60 communicates with the second opening 22 of the cyclone cylinder 20. The number of the conical cylinders 60 is equal to the number of the cyclone cylinders 20. The conical cylinders 60 and the cyclone cylinders 20 are in one-to-one correspondence. One conical cylinder 60 is connected below each cyclone cylinder 20. In one embodiment, the number of the conical cylinders 60 can be 1, 2, 3, 5, 6, 7 or 8. In this embodiment, the number of the return air cylinders 50, the cyclone cylinders 20 and the conical cylinders 60 is 4. The air flow swirling down from the second opening 22 of the cyclone cylinder 20 will continue to swirl downward under its rotational tendency, which will prevent the air flow from rising under its own buoyancy and flowing into the lower end opening of the return air cylinder 50. By providing the conical cylinder 60, due to the taper of the conical cylinder 60, the air flow swirling down from the second opening 22 of the cyclone cylinder 20 will directly strike the inner wall of the conical cylinder 60, and the swirling tendency of the air flow will dissipate, so that the air flow will move upward under the action of its own buoyancy and flow into the lower end opening of the return air cylinder 50, and then flow out from the upper end opening of the return air cylinder 50.

[0104] The diameter of the oil drain port 61 of the conical cylinder 60 is smaller than the diameter of the return air cylinder 50. In this way, the air flow in the conical cylinder 60 is more likely to flow out from the return air cylinder 50, rather than directly flowing out from the oil drain port 61 under the swirling tendency of the air flow, which will deteriorate the oil-gas separation effect of the oil separator 1. When the air flow contacts the inner wall of the conical cylinder 60, it will also adhere to the inner wall of the conical cylinder 60. The oil liquid accumulated on the inner wall of the conical cylinder 60 can directly flow out from the oil drain port 61 of the conical cylinder 60. By providing 4 conical cylinders 60, the adhesion area of the air flow is increased, so that the oil-gas separation effect of the conical cylinder 60 is improved.

[0105] Please refer to Figure 14 、 16 、18 and Figures 21 to 22, the oil separator 1 further includes at least one guide cylinder 70. The axis of the guide cylinder 70 is parallel to the axis of the main cylinder 10. The guide cylinder 70 is a straight cylinder structure with both upper and lower ends open. Each guide cylinder 70 is arranged between a cyclone cylinder 20 and a conical cylinder 60 and is in communication with both the cyclone cylinder 20 and the conical cylinder 60. The upper opening of the guide cylinder 70 is butted against the second opening 22 of the cyclone cylinder 20, and the lower opening of the guide cylinder 70 is butted against the air inlet of the conical cylinder 60. The function of the guide cylinder 70 is to guide the air flow to flow from the second opening 22 of the cyclone cylinder 20 into the air inlet of the conical cylinder 60. The number of the guide cylinders 70 is the same as the number of the cyclone cylinders 20. The guide cylinders 70 and the cyclone cylinders 20 are in one-to-one correspondence. In one embodiment, the number of the guide cylinders 70 can be 1, 2, 3, 5, 6, 7 or 8. In this embodiment, the gas return cylinder 50, the cyclone cylinders 20, the conical cylinders 60 and the guide cylinders 70 are all 4 in number.

[0106] In one embodiment, the cyclone cylinder 20, the guide cylinder 70 and the conical cylinder 60 are of an integral structure. In one embodiment, the second partition plate 40, the cyclone cylinder 20, the guide cylinder 70, the fixing member 80 and the conical cylinder 60 are of an integral structure. Therefore, the second partition plate 40, the cyclone cylinder 20, the guide cylinder 70, the conical cylinder 60 and the fixing member 80 can be integrally processed by injection molding or casting, etc., saving the preparation process and reducing the cost.

[0107] In one embodiment, the gas return cylinder 50 extends into the guide cylinder 70. Since the gas return cylinder 50 is a circular straight cylinder, therefore, compared with the conical cylinder 60, the guide cylinder 70 is more convenient to cooperate with the gas return cylinder 50, and the lower end of the gas return cylinder 50 can also be made lower. The gas return cylinder 50 extending into the guide cylinder 70 can further prevent the air flow in the cyclone cylinder 20 from flowing out directly from the lower opening of the gas return cylinder 50 without sufficient swirling in the cyclone cylinder 20. At the same time, the guide cylinder 70 also increases the adhesion area of the air flow, and the oil droplets in the air flow can adhere to the inner wall of the guide cylinder 70, and the guide cylinder 70 also plays an effect of oil-gas separation. By arranging 4 guide cylinders 70, this increases the adhesion area of the air flow and improves the oil-gas separation effect of the guide cylinder 70.

[0108] Since the oil separator 1 is used to separate high-temperature oil-containing gas, the oil separator 1 of the present invention is made of high-temperature resistant materials. In one embodiment, the oil separator 1 can be made of metal. In one embodiment, the oil separator 1 can be made of plastic, specifically polyphenylene sulfide (PPS).

[0109] On the inner circumferential surface of the main cylinder body 10, an upper limit protrusion and a lower limit protrusion are provided, and the upper limit protrusion and the lower limit protrusion are arranged at intervals along the axial direction of the main cylinder body 10. Specifically, the upper limit protrusion is arranged on the upper side of the first partition plate 30, and the lower limit protrusion is arranged on the lower side of the second partition plate 40. The upper limit protrusion and the lower limit protrusion form a limit groove to fix the separation component in the cylinder cavity 11. The upper limit protrusion and the lower limit protrusion can be integrally formed with the main cylinder body by a spinning process. In one embodiment, both the upper limit protrusion and the lower limit protrusion are annular, so that they can be directly integrally formed with the main cylinder body by a spinning process.

[0110] According to some embodiments of the second aspect of the present invention, a heating, ventilation and air conditioning (HVAC) device is provided. The HVAC device includes the oil separator 1 according to the first aspect of the present invention. The HVAC device includes, but is not limited to, air conditioners, multi-split air conditioners, heat pumps, water heaters, pool machines, etc.

[0111] In one embodiment, the HVAC device is an air conditioner and includes an evaporator, a compressor, and a condenser. The oil separator 1 is connected to the compressor and is used to separate the oil liquid from the high-temperature oil-containing gas output by the compressor. The oil liquid is the lubricating oil required for the operation of the compressor. The HVAC device further includes an exhaust pipe that connects the compressor and the condenser. The oil separator 1 is arranged on the exhaust pipe. The HVAC device further includes an oil return pipe, and the oil return pipe includes a first end and a second end arranged in opposite directions. The first end of the oil return pipe is connected to the oil separator 1. The HVAC device further includes a suction pipe. The suction pipe connects the evaporator and the compressor in a pipeline. The second end of the oil return pipe is connected to the suction pipe.

[0112] In the HVAC device according to the second aspect of the present invention, the lubricating oil in the oil-containing gas output by the compressor is separated by the oil separator 1, which avoids the lubricating oil of the compressor itself from flowing into the condenser, causing the compressor to be in an oil-deficient state. When the compressor lacks lubricating oil, it will affect the working state of the compressor and accelerate the wear of the compressor life.

[0113] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An oil separator, It is characterized in that include: A main cylinder body, the main cylinder body having a cylinder wall, a cylinder cavity surrounded by the cylinder wall, and a total air inlet and an air outlet communicated with the cylinder cavity, the total air inlet being arranged on the cylinder wall of the main cylinder body; An air intake pipe, wherein the air intake pipe is arranged on the cylinder side of the main cylinder body and is arranged tangent to the main cylinder body, the axial direction of the air intake pipe is arranged to intersect with the axial direction of the main cylinder body, the air intake pipe comprises an air intake port and an air outlet port arranged opposite to the air intake port, the air intake port is used for external air flow to flow into the air intake pipe, the air outlet port is connected to the total air intake port, along the axial direction of the main cylinder body, the size of the flow cross-section of the air outlet port is L11, the size of the flow cross-section of the air intake port is L21, and L11 is larger than L21.

2. The oil separator according to claim 1, It is characterized in that The air inlet pipe includes a first pipe section and a second pipe section connected to each other, the end of the first pipe section away from the second pipe section forms the air outlet port, the end of the second pipe section away from the first pipe section forms the air inlet port, the size of the flow cross-section of the first pipe section is L1, the size of the flow cross-section of the second pipe section is L2, and L1 is larger than L2.

3. The oil separator according to claim 2, It is characterized in that The flow cross section of the first pipe section is flat, and / or the flow cross section of the second pipe section is circular.

4. The oil separator according to claim 3, It is characterized in that The air intake pipe also includes a transition pipe section, one end of which is adapted to and communicated with the first pipe section, and the other end of which is adapted to and communicated with the second pipe section.

5. The oil separator according to claim 2, It is characterized in that The flow cross-section of the first pipe section and the flow cross-section of the second pipe section are both elliptical.

6. The oil separator according to claim 2, It is characterized in that The flow cross section area of ​​the first pipe segment is greater than or equal to the flow cross section area of ​​the second pipe segment.

7. The oil separator according to any one of claims 2 to 6, It is characterized in that Along the direction from the second pipe section to the first pipe section, the flow cross section of the first pipe section gradually increases along the axial direction of the main cylinder.

8. The oil separator according to any one of claims 2 to 6, It is characterized in that The axis of the air inlet pipe is arranged to intersect with the axis of the main cylinder.

9. The oil separator according to any one of claims 2 to 6, It is characterized in that The oil separator also includes at least one cyclone cylinder, which is arranged in the cylinder cavity and spaced apart from the inner circumference of the main cylinder body, and a first cyclone channel is formed between the outer circumference of the cyclone cylinder and the inner circumference of the main cylinder body, and the air intake pipe is connected to the first cyclone channel through the total air intake port.

10. The oil separator according to claim 1, It is characterized in that The oil separator also includes a first partition plate and a second partition plate. The first partition plate and the second partition plate are spaced apart along the axial direction of the cylinder cavity. The first partition plate, the second partition plate, the swirl cylinder and the cylinder cavity together form the first swirl channel. The swirl cylinder is formed with a first opening and a second opening spaced apart along its axial direction. The first opening is arranged close to the air outlet. The first partition plate closes the first opening of the swirl cylinder and together with the swirl cylinder forms the second swirl channel. The total air inlet is arranged between the first partition plate and the second partition plate.

11. The oil separator according to claim 10, It is characterized in that Along the axial direction of the main cylinder, the size of the total air inlet is smaller than or equal to the distance between the first partition plate and the second partition plate.

12. A heating and ventilation equipment, It is characterized in that The HVAC equipment comprises an oil separator according to any one of claims 1-11.

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