Oil separator and heating and ventilation equipment

Abstract

The invention belongs to the technical field of oil separation, particularly relates to an oil separator and heating and ventilation equipment, and aims at solving the technical problem that an existing oil separator is poor in separation effect. The oil separator comprises a main cylinder body, wherein a cylinder cavity, a main air inlet and an air outlet are formed in the main cylinder body, and the main air inlet and the air outlet are communicated with the cylinder cavity; the rotational flow cylinders are arranged in the cylinder cavities, the rotational flow cylinders and the inner circumferential face of the main cylinder body are arranged at intervals, first rotational flow channels are formed between the outer circumferential faces of the rotational flow cylinders and the inner circumferential face of the main cylinder body, the main air inlet communicates with the first rotational flow channels so as to allow external airflow to enter the first rotational flow channels, and second rotational flow channels are formed in the rotational flow cylinders; the first rotational flow channel is communicated with the second rotational flow channel, and the second rotational flow channel is communicated with the air outlet. The oil separator comprises the first rotational flow channel and the second rotational flow channel which are communicated with each other, air flow sequentially flows in the first rotational flow channel and the second rotational flow channel, secondary separation is achieved, and the oil-gas separation effect is good.

Description

[0001] Priority Information

[0002] This application claims the priority and benefits of the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] A Chinese patent application with the application number 202311591320.4 and the title "Oil Separator and HVAC Equipment", which was filed with the China National Intellectual Property Administration on November 24, 2023. Technical Field

[0004] This application belongs to the technical field of oil separation, and particularly relates to an oil separator and HVAC equipment. Background Art

[0005] What is provided in this section is only background information related to the present disclosure, and it is not necessarily prior art.

[0006] Currently, the oil separator includes a cylindrical cavity. When the inlet is set at a certain distance from the center of the cylindrical cavity, due to the eccentric structure, the airflow with oil mist will swirl when entering from the inlet. This structure is simple, but the separation effect is not good. Summary of the Invention

[0007] The purpose of the present invention is to at least solve the technical problem of the poor separation effect of the existing oil separator. This purpose is achieved through the following means:

[0008] The first aspect of the present invention provides an oil separator, including:

[0009] A main cylinder body, which forms a cylindrical cavity, a total air inlet and an air outlet communicating with the cylindrical cavity;

[0010] At least one swirl cylinder, which is arranged in the cylindrical cavity and spaced from the inner peripheral surface of the main cylinder body. A first swirl channel is formed between the outer peripheral surface of the swirl cylinder and the inner peripheral surface of the main cylinder body. The total air inlet is communicated with the first swirl channel to allow external airflow to enter the first swirl channel. A second swirl channel is formed in the swirl cylinder. The first swirl channel is communicated with the second swirl channel, and the second swirl channel is communicated with the air outlet.

[0011] The oil separator according to the present invention includes a first cyclone channel and a second cyclone channel that communicate with each other. Since the external air flow entering from the total air inlet first enters the first cyclone channel and then enters the second cyclone channel, the air flow adheres to the inner walls of the first cyclone channel and the second cyclone in the first cyclone channel and the second cyclone channel, thereby performing secondary oil-gas separation in the first cyclone channel and the second cyclone. Therefore, the oil-gas separation effect of the oil separator is relatively good. The first cyclone channel is arranged between the main cylinder and the cyclone cylinder inside it. Therefore, the first cyclone channel is annular, and the air flow rotates circumferentially in the annular first rotation channel, which increases the contact area between the air flow and the inner wall of the first cyclone channel, enabling more oil droplets in the air flow to adhere to the inner wall of the first cyclone channel, and making the oil separation effect of the first cyclone channel relatively good. Further, the second cyclone channel is arranged inside the cyclone cylinder. The air flow rotates circumferentially in the first cyclone channel and will continue to rotate circumferentially inside the cyclone cylinder under its inertia when entering the cyclone cylinder. This enables the air flow to fully contact the inner wall of the cyclone cylinder, which increases the contact area between the air flow and the inner wall of the second cyclone channel, enabling more oil droplets in the air flow to adhere to the inner wall of the second cyclone channel, and making the oil separation effect of the second cyclone channel relatively good.

[0012] In addition, the oil separator according to the present invention may further have the following additional technical features:

[0013] In some embodiments of the present invention, the radial cross-section of the cyclone cylinder is spiral.

[0014] The spiral cyclone cylinder includes an arc-shaped guiding portion. The arc-shaped guiding portion is tangentially arranged with the first cyclone channel. Therefore, the arc-shaped guiding portion has the function of guiding the air flow into the side opening, which can enable as much air flow as possible in the first cyclone channel to flow into the cyclone cylinder. At the same time, the arc-shaped guiding portion increases the area of the inner circumferential surface of the cyclone cylinder, enabling the air flow to contact a larger area of the inner circumferential surface of the cyclone cylinder. Furthermore, more oil droplets in the air flow adhere to the inner circumferential surface of the cyclone cylinder, making the oil-gas separation effect of the cyclone cylinder relatively good.

[0015] In some embodiments of the present invention, the swirling direction of the first cyclone channel is the same as that of the second cyclone channel.

[0016] The swirling direction of the first cyclone channel is the same as that of the second cyclone channel, and the air flow in the first cyclone channel will flow into the second cyclone channel as much as possible.

[0017] In some embodiments of the present invention, the oil separator 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 a 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 a second cyclone channel with the cyclone cylinder.

[0018] The first partition plate, the second partition plate, the cyclone cylinder and the cylinder cavity enclose an annular first cyclone channel. The air flow rotates circumferentially in the annular first rotating channel, which increases the contact area between the air flow and the inner wall of the first cyclone channel, so that more oil droplets in the air flow adhere to the inner wall of the first cyclone channel, making the oil separation effect of the first cyclone channel better. Further, the second cyclone channel is arranged in the cyclone cylinder, and the first opening of the cyclone cylinder is closed by the first partition plate. Therefore, the air flow rotating circumferentially in the first cyclone channel will not flow out from the first opening, and will continue to rotate circumferentially in the cyclone cylinder under its inertia when entering the cyclone cylinder, which makes the air flow fully contact with the inner wall of the cyclone cylinder, increasing the contact area between the air flow and the inner wall of the second cyclone channel, so that more oil droplets in the air flow adhere to the inner wall of the second cyclone channel, making the oil separation effect of the second cyclone channel better.

[0019] In some embodiments of the present invention, the first partition plate is covered on the upper side of the first opening of the cyclone cylinder. The second partition plate is formed with at least one through hole, and the through holes correspond to the cyclone cylinders one by one. One end of the cyclone cylinder close to the second opening penetrates through the through hole, and the rotating cylinder is hermetically connected to the second partition plate.

[0020] The second partition plate makes the second opening of the cyclone cylinder not be closed through the through hole. After the air flow in the cyclone cylinder rotates in the cyclone cylinder, it can flow out through the second opening.

[0021] In some embodiments of the present invention, the cyclone cylinder includes a side opening, and the side opening is arranged on the outer peripheral surface of the cyclone cylinder. The side opening communicates the first cyclone channel with the second cyclone channel.

[0022] The air flow in the first cyclone channel can flow into the cyclone cylinder through the side opening.

[0023] In some embodiments of the present invention, an oil return hole is formed in the plate surface of the second partition plate. The oil return hole is arranged outside the side opening of the cyclone cylinder and communicates with the side opening.

[0024] The oil return hole is arranged outside the side opening of the cyclone cylinder and communicates with the side opening. Therefore, the oil liquid in the first cyclone channel and the second cyclone channel can flow out from the second oil return hole.

[0025] In some embodiments of the present invention, oil return holes are formed on the outer peripheral surface of the second partition plate.

[0026] The oil return holes are arranged on the outer peripheral surface of the second partition plate, so the oil return holes are closer to the inner peripheral surface of the main cylinder body. Therefore, the oil liquid accumulated in the first swirl channel is more likely to flow out from the first oil return hole.

[0027] In some embodiments of the present invention, the oil separator further includes at least one air return cylinder. The air return cylinder is communicated with the air outlet. The air return cylinders correspond to the swirl cylinders one by one and are arranged inside the swirl cylinders. The lower end of the air return cylinder is lower than the lower end of the side opening.

[0028] When the air return cylinder is inserted into the swirl cylinder, the second swirl channel in the swirl cylinder is improved from a cylindrical shape to an annular channel, which increases the area of the inner surface of the second swirl channel. During the swirling process of the air flow in the second swirl channel, the air flow will contact the inner surface of the swirl cylinder and the outer surface of the air return cylinder at the same time, and the air flow will adhere to the inner surface of the swirl cylinder and the outer surface of the air return cylinder at the same time, further improving the oil separation effect of the second swirl channel. At the same time, the lower end of the air return cylinder is lower than the lower end of the side opening, which avoids the air flow in the swirl cylinder flowing directly into the lower end opening of the air return cylinder without swirling in the swirl cylinder and flowing out of the oil separator through the air outlet, resulting in a poor oil separation effect of the swirl cylinder.

[0029] In some embodiments of the present invention, the first partition plate is formed with at least one air return hole. The air return holes correspond to the air return cylinders one by one, and the air return holes are sealingly connected to the outer peripheral surface of the air return cylinders.

[0030] The air return holes are sealingly connected to the outer peripheral surface of the air return cylinders, and the air return cylinders can extend out of the air return holes to the upper end of the air return holes. In this way, the first partition plate cannot close the upper end opening of the air return cylinder, so that the upper end opening of the air return cylinder can be communicated with the air outlet of the oil separator, and the air flow in the air return cylinder can flow out through its upper end opening and then out of the oil separator through the air outlet.

[0031] In some embodiments of the present invention, the oil separator further includes at least one conical cylinder. The conical cylinder includes an air inlet and an oil discharge port. The diameter of the air inlet is larger than the diameter of the oil discharge port, and the air inlet of the conical cylinder is communicated with the second opening of the swirl cylinder.

[0032] By providing the conical cylinder, due to the taper of the conical cylinder, the air flow swirling down from the second opening of the swirl cylinder will directly strike the inner wall of the conical cylinder, and the swirling trend of the air flow will dissipate. Then, under the action of the buoyancy of the air flow itself, it will move upward, flow into the lower end opening of the air return cylinder, and then flow out from the upper end opening of the air return cylinder.

[0033] In some embodiments of the present invention, the diameter of the oil discharge port of the conical cylinder is smaller than the diameter of the air return cylinder.

[0034] The diameter of the oil drain port of the conical cylinder is smaller than that of the air return cylinder. Thus, the airflow inside the conical cylinder is more likely to flow out from the air return cylinder rather than directly flow out from the oil drain port under the swirling trend of the airflow, which would deteriorate the oil-gas separation effect of the oil separator.

[0035] In some embodiments of the present invention, the oil separator further includes at least one guiding cylinder, and each guiding cylinder is disposed between a swirling cylinder and a conical cylinder and is in communication with both the swirling cylinder and the conical cylinder.

[0036] The air return cylinder is a circular straight cylinder. Therefore, compared with the conical cylinder, the guiding cylinder is more convenient to cooperate with the air return cylinder, and it can also make the lower end of the air return cylinder lower. The air return cylinder extending into the guiding cylinder can further prevent the airflow in the swirling cylinder from flowing out directly from the lower end opening of the air return cylinder without sufficient swirling inside the swirling cylinder. At the same time, the guiding cylinder also increases the adhesion area of the airflow, and the oil droplets in the airflow can adhere to the inner wall of the guiding cylinder, and the guiding cylinder also plays an oil-gas separation effect.

[0037] The second invention of the present invention provides a heating, ventilation and air conditioning (HVAC) device, which includes the oil separator according to the first aspect of the present invention.

[0038] The HVAC device provided by the second invention 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.

[0039] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present 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 the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. Brief Description of the Drawings

[0040] 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:

[0041] Figure 1 Schematically shows a front view of an oil separator provided according to some embodiments of the first aspect of the present invention.

[0042] Figure 2 For Figure 1 The A-A cross-sectional view of the oil separator shown in

[0043] Figure 3 Schematically shows a front view of the main cylinder body provided according to some embodiments of the first aspect of the present invention.

[0044] Figure 4Schematically shows a front view of a separation component provided according to some embodiments of the first aspect of the present invention.

[0045] Figure 5 For Figure 4 a B - B cross - sectional view of the separation cone shown in

[0046] Figure 6 Schematically shows a perspective view of a separation component provided according to some embodiments of the first aspect of the present invention.

[0047] Figure 7 Schematically shows a perspective view of a separation component provided according to some embodiments of the first aspect of the present invention (with Figure 5 a different placement angle from the separation component in

[0048] Figure 8 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.

[0049] Figure 9 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.

[0050] Figure 10 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 9 a different placement angle).

[0051] Figure 11 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.

[0052] Figure 12 Schematically shows a front view of a first partition plate and a return air cylinder provided according to some embodiments of the first aspect of the present invention.

[0053] Figure 13 Schematically shows a perspective view of a first partition plate and a return air cylinder provided according to some embodiments of the first aspect of the present invention.

[0054] Figure 14 Schematically shows a perspective view of a first partition plate and a return air cylinder provided according to some embodiments of the first aspect of the present invention (with Figure 13 a different placement angle).

[0055] Figure 15 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.

[0056] Figure 16 For Figure 15 the C-C sectional view of the cyclone tube, the second partition plate, the draft tube and the conical tube shown in

[0057] Figure 17 The perspective view of the cyclone tube, the second partition plate, the draft tube and the conical tube provided according to some embodiments of the first aspect of the present invention is schematically shown.

[0058] Figure 18 The top view of the cyclone tube, the second partition plate, the draft tube and the conical tube provided according to some embodiments of the first aspect of the present invention is schematically shown.

[0059] Figure 19 The flow direction of the air flow in the separation component provided according to some embodiments of the first aspect of the present invention is schematically shown.

[0060] Figure 20 Schematically shown is Figure 11 the flow direction of the air flow in

[0061] The reference numerals in the drawings are shown as follows:

[0062] 1, oil separator;

[0063] 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 swirl channel; 102, second swirl channel; 103, intake pipe; 104, gas transmission pipe; 105, oil transmission pipe;

[0064] 20, cyclone tube; 21, first opening; 22, second opening; 23, side opening; 24, arc-shaped guide part;

[0065] 30, first partition plate; 31, air return hole;

[0066] 40, second partition plate; 41, through hole; 42, arc-shaped plate; 43, oil return notch; 44, second oil return hole;

[0067] 50, air return cylinder;

[0068] 60, conical tube; 61, oil drain port;

[0069] 70, draft tube;

[0070] 80, fixing part; 81, corner hole; 82, center hole. Detailed implementation manners

[0071] 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.

[0072] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates 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 an order of performance is expressly stated. It should also be understood that additional or alternative steps may be used.

[0073] Although the terms first, second, third, etc. may be used in this document to describe multiple elements, components, regions, layers, and / or

[0074] portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or portion from another region, layer, or portion. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or portion discussed below may be referred to as the second element, component, region, layer, or portion without departing from the teachings of the example embodiments.

[0075] 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 relative to another element or feature. These 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 other than the orientations depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below" or "beneath" other elements or features will subsequently 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 interpreted accordingly.

[0076] Combined with Figures 1 to 18 As shown, according to some embodiments of the first aspect of the present invention, an oil separator 1 is provided, which includes a main cylinder body 10 and at least one cyclone cylinder 20. The main cylinder body 10 is formed with a cylinder cavity 11, a total air inlet 12 and an air outlet 13 communicating with the cylinder cavity 11. The cyclone cylinder 20 is disposed in the cylinder cavity 11 and is spaced from the inner peripheral surface of the main cylinder body 10. A first cyclone channel 101 is formed between the outer peripheral surface of the cyclone cylinder 20 and the inner peripheral surface of the main cylinder body 10. The total air inlet 12 communicates with the first cyclone channel 101 to allow external air flow to enter the first cyclone channel 101. A second cyclone channel 102 is formed in the cyclone cylinder 20. The first cyclone channel 101 communicates with the second cyclone channel 102, and the second cyclone channel 102 communicates with the air outlet 13. In one embodiment, the air flow is an oil-containing air flow.

[0077] The oil separator 1 according to the present invention includes a first cyclone channel 101 and a second cyclone channel 102 that communicate with each other. Since the external air flow entering from the total air inlet 12 first enters the first cyclone channel 101 and then enters the second cyclone channel 102, the air flow adheres to the inner walls of the first cyclone channel 101 and the second cyclone in the first cyclone channel 101 and the second cyclone channel 102, thereby performing secondary oil-gas separation in the first cyclone channel 101 and the second cyclone. Therefore, the oil-gas separation effect of the oil separator 1 is relatively good. The first cyclone channel 101 is disposed between the main cylinder 10 and the cyclone cylinder 20 inside it. Therefore, the first cyclone channel 101 is annular, and the air flow rotates circumferentially in the annular first rotation channel, which increases the contact area between the air flow and the inner wall of the first cyclone channel 101, enabling more oil droplets in the air flow to adhere to the inner wall of the first cyclone channel 101, and making the oil separation effect of the first cyclone channel 101 relatively good. Further, the second cyclone channel 102 is disposed inside the cyclone cylinder 20. The air flow rotates circumferentially in the first cyclone channel 101 and will continue to rotate circumferentially inside the cyclone cylinder 20 under its inertia when entering the cyclone cylinder 20. This enables the air flow to fully contact the inner wall of the cyclone cylinder 20, which increases the contact area between the air flow and the inner wall of the second cyclone channel 102, enabling more oil droplets in the air flow to adhere to the inner wall of the second cyclone channel 102, and making the oil separation effect of the second cyclone channel 102 relatively good.

[0078] Please refer to Figure 1 、 Figure 2 and Figure 3 , the main cylinder 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, and 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 the cylinder cavity 11 of the main cylinder 10. In one embodiment, the main cylinder 10 is an integral structure, and the main cylinder 10 can be prepared by a spinning molding method. The main cylinder 10 includes a total air inlet 12, and the total air inlet 12 is disposed on the outer peripheral surface of the cylindrical section 15 and communicates with the cylinder cavity 11.

[0079] To more clearly explain the present invention, the axial direction of the main cylinder 10 is defined as the up-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.

[0080] The cylindrical section 15 includes an upper opening and a lower opening that are axially spaced apart along it. The first conical section 16 includes a large-diameter opening and a small-diameter opening, where the large-diameter opening is docked with the upper opening of the cylindrical section 15. Docking includes the meaning of sealed connection, that is, the large-diameter opening of the first conical section 16 is sealed and connected to the upper opening of the cylindrical section 15 and is in communication. The small-diameter opening is docked with 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, where the large-diameter opening is docked with the lower opening of the cylindrical section 15, and the small-diameter opening is docked with 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 in communication with the barrel cavity 11.

[0081] 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 gas transmission pipe 104 outside the main barrel 10 for easy connection to each other, and the diameter of the small-diameter opening of the second conical section 17 matches the diameter of the oil transmission pipe 105 outside the main barrel 10 for easy connection to each other. The function of the first connecting pipe 18 is to be inserted into the gas transmission pipe 104 outside the main barrel 10 to achieve communication, and the function of the second connecting pipe 19 is to be inserted into the oil transmission pipe 105 outside the main barrel 10 to achieve communication.

[0082] Inside the barrel cavity 11, 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 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 constitute a separation assembly. Further, Figures 4 to 7 The separation assembly is shown. The separation assembly is a collection of internal components of the main barrel 10, and the function of the separation assembly is to define all the oil-gas separation channels inside the barrel cavity 11.

[0083] Please refer to Figures 4 to 11, the cyclone tube 20 is disposed within the barrel cavity 11 of the main barrel 10 and is spaced apart from the inner wall of the barrel cavity 11. The axial direction of the cyclone tube 20 is parallel to the axial direction of the main barrel 10. Specifically, the cyclone tube 20 is disposed within the cylindrical section 15. The axial dimension L1 of the cyclone tube 20 is less than the axial dimension L2 of the main barrel 10. The number of cyclone tubes 20 is at least one. For example, the number of cyclone tubes 20 can be 1, 2, 3, 5, 6, 7, or 8. In one embodiment, the number of cyclone tubes 20 is 4. The 4 cyclone tubes 20 are arranged in a ring. It can be understood that when the number of cyclone tubes 20 is multiple, the multiple cyclone tubes 20 can be arranged in a ring and spaced apart from the inner circumferential surface of the barrel cavity 11. The ring arrangement can enable each cyclone tube 20 to be adjacent to the first swirl channel 101, and can enable each cyclone tube 20 to communicate with the first swirl channel 101. Within the barrel cavity 11, the multiple cyclone tubes 20 are arranged adjacent to each other and are located in the middle region of the barrel cavity 11. In this way, the space of the first swirl channel 101 can be made as large as possible. The adjacent cyclone tubes 20 can be arranged to overlap each other or be spaced apart.

[0084] The cyclone tube 20 includes a first opening 21 and a second opening 22 which are 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 tube 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 tube 20 is arranged towards the first swirl channel 101 so that the air flow in the first swirl channel 101 can flow into the cyclone tube 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 barrel 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. The side opening 23 does not communicate the first opening 21 and the second opening 22.

[0085] The shape of the cyclone tube 20 is not limited. The radial cross-section of the cyclone tube 20 can be circular or polygonal. In one embodiment, the cyclone tube 20 is a spiral tube, that is, the radial cross-section of the cyclone tube 20 is spiral. In one embodiment, the cyclone tube 20 rotates counterclockwise from the inside to the outside, that is, the inner barrel wall of the cyclone tube 20 rotates counterclockwise to the outer barrel wall, and the side opening 23 is the gap between the inner barrel wall and the outer barrel wall of the cyclone tube 20. Please refer to Figure 11, the outermost cylindrical wall of the spiral swirl tube 20 is defined as an arc-shaped guide portion 24. The arc-shaped guide portion 24 is tangentially arranged with the first swirl channel 101. Therefore, the arc-shaped guide portion 24 has the function of guiding the air flow into the side opening 23, which can make as much air flow in the first swirl channel 101 flow into the swirl tube 20 as possible. At the same time, the arc-shaped guide portion 24 increases the area of the inner peripheral surface of the swirl tube 20, so that the air flow contacts the inner peripheral surface of the swirl tube 20 with a larger area. Furthermore, more oil droplets in the air flow adhere to the inner peripheral surface of the swirl tube 20, making the oil-gas separation effect of the swirl tube 20 better.

[0086] In one embodiment, the swirl tube 20 is a cylinder with a side opening 23 formed on its outer peripheral surface, and the radial cross-section of the swirl 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 10 to form the side opening 23. In another embodiment, the swirl tube 20 is a square tube with a side opening 23 formed on its outer peripheral surface.

[0087] The oil separator 1 further includes an air inlet pipe 103 for delivering the oil-containing air flow into the cylinder chamber 11. The air inlet pipe 103 is tangentially arranged with the outer peripheral surface of the main cylinder 10. Please refer to Figure 19 and Figure 20 , after the air flow enters the first swirl channel 101 from the air inlet pipe 103, it rotates in the first swirl channel 101. By controlling the position of the air inlet pipe 103, the air flow can rotate clockwise or counterclockwise after entering the first swirl channel 101. In one embodiment, the air flow rotates clockwise in the first swirl channel 101. To facilitate the air flow to enter the swirl tube 20, the side opening 23 of the spiral tube is arranged facing the air flow. Specifically, the cylindrical wall of the spiral swirl tube 20 is arranged to rotate counterclockwise from the inside to the outside. In this way, the swirl direction of the first swirl channel 101 is the same as that of the second swirl channel 102, and the air flow in the first swirl channel 101 will flow into the second swirl channel 102 as much as possible.

[0088] In one embodiment, the air flow rotates counterclockwise in the first swirl channel 101, and the cylindrical wall of the spiral swirl tube 20 is arranged to rotate clockwise from the inside to the outside. The swirl direction of the first swirl channel 101 is the same as that of the second swirl channel 102. Similarly, the side opening 23 of the spiral swirl tube 20 can be arranged facing the air flow, so that the air flow can flow into the swirl tube 20 as much as possible.

[0089] Please refer to Figures 4 to 18, 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 tube 20, and the second partition plate 40 is connected to the lower side of the second opening 22 of the cyclone tube 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 tube 20 enclose and form a first swirl passage 101. The first partition plate 30 and the second partition plate 40 respectively close the upper and lower openings of the first swirl passage 101, so that the air flow in the first swirl passage 101 can only flow into the second swirl passage 102. The first partition plate 30 also closes the first opening at the upper end of the cyclone tube 20, so that the air flow in the cyclone tube 20 can only swirl and flow downward after swirling in the cyclone tube 20.

[0090] At least one through hole 41 is formed on the second partition plate 40. The number of through holes 41 is the same as the number of cyclone tubes 20, and the through holes 41 correspond to the cyclone tubes 20 one by one. One end of the cyclone tube 20 close to the second opening 22 penetrates through the through hole 41. One end of the cyclone tube close to the second opening penetrates through the through hole, and the rotating tube is hermetically connected to the second partition plate. In this way, the second partition plate 40 penetrates through the through hole 41, so that the second opening 22 of the cyclone tube 20 is not closed. After swirling in the cyclone tube 20, the air flow in the cyclone tube 20 can flow out through the second opening 22.

[0091] In one embodiment, the cyclone tube 20 is a spiral tube, and the second opening 22 of the cyclone tube 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 only docks with the circular hole portion of the second opening 22 of the cyclone tube 20. The arc hole portion of the second opening 22 is closed by the second partition plate 40. The part of the second partition plate 40 that closes 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 tube 20 and plays a role in guiding the flow. The arc plate 42 also plays a role in fixing the cyclone tube 20 to the second partition plate 40. The lower end of the arc-shaped guide portion 24 of the cyclone tube 20 is connected to the second partition plate 40, which also plays a role in fixing the cyclone tube 20 to the second partition plate 40.

[0092] Please refer to Figures 15 to 18, in one embodiment, an oil return hole is formed on 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.

[0093] The oil return hole includes a first oil return hole and / or a second oil return hole 44. The first oil return hole is provided 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.

[0094] The second oil return hole 44 is provided 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 provided in a region 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 provided in regions 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 region outside the side opening 23 of each swirl cylinder 20.

[0095] 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 provided 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.

[0096] Please refer to Figures 2 to 7, 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 cyclone cylinder 20 one by one and the gas return cylinder 50 is arranged inside the cyclone cylinder 20. The number of gas return cylinders 50 is equal to the number of cyclone 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 cyclone cylinder 20 are 4. The gas return cylinder 50 corresponds to the cyclone cylinder 20 one by one, and one gas return cylinder 50 is arranged inside each cyclone cylinder 20. In this way, the swirling air flow inside the cyclone 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 cyclone cylinder 20, the second swirling channel 102 inside the cyclone cylinder 20 is improved from a cylindrical shape to an annular channel, which increases the area of the inner surface of the second swirling channel 102, and makes the air flow contact with the inner surface of the cyclone cylinder 20 and the outer surface of the gas return cylinder 50 simultaneously during the swirling process in the second swirling channel 102. The air flow will adhere to both the inner surface of the cyclone cylinder 20 and the outer surface of the gas return cylinder 50, and the oil separation effect of the second swirling channel 102 is further improved.

[0097] The lower end of the gas return cylinder 50 is lower than the lower end of the side opening, avoiding the air flow inside the cyclone cylinder 20 flowing directly into the lower end opening of the gas return cylinder 50 without swirling inside the cyclone cylinder 20 and flowing out of the oil separator 1 from the air outlet 13, which makes the oil separation effect of the cyclone cylinder 20 worse. 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. In this way, it can be ensured that the air flow inside the cyclone cylinder 20 rotates sufficiently in the second swirling 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 swirling channel 102 is better.

[0098] At least one air return hole 31 is formed on the first partition plate 30, and the air return hole 31 is connected to 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 correspond to the air return cylinders 50 one by one. Each air return cylinder 50 corresponds to an air return hole 31. The air return hole 31 is connected to the upper end opening of the air return cylinder 50. In one embodiment, the air return hole 31 is sealed and 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 be connected to 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 is understandable that the airflow will also contact the inner wall of the return cylinder 50 during the process of flowing out from the return cylinder 50, and the oil droplets in the airflow will adhere to the inner wall of the return cylinder 50. Therefore, the return cylinder 50 also has the function of oil and gas separation. The oil droplets adhering to the inner wall of the return cylinder 50 can drip from the inner wall of the return cylinder 50, fall into the conical cylinder 60 below the 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 return cylinder 50 are an integrated structure. In this way, the first partition plate 30 and the return cylinder 50 can be processed as a whole by injection molding or casting, which saves the preparation process and reduces the cost.

[0099] See also Figure 9 , the oil separator 1 also includes a fixing member 80. The fixing member 80 is connected to the outer peripheral surface of the cyclone tube 20 and is arranged near the first opening 21 of the cyclone tube 20. In the case where there are at least two cyclone tubes 20, the fixing member 80 is arranged between at least two cyclone tubes 20, and the fixing member 80 is fixedly connected to the outer peripheral surface of each cyclone tube 20. Multiple cyclone tubes 20 can be fixedly connected by the fixing member 80. A fixing hole is formed on the upper surface of the fixing member 80, and a fixing protrusion (not shown in the figure) is arranged on the lower surface of the first partition plate 30. When the first partition plate 30 is covered on the upper side of the first opening 21 of the cyclone tube 20, the fixing protrusion on the lower surface of the first partition plate 30 is inserted into the fixing hole, thereby positioning the first partition plate 30 with the cyclone tube 20, so as to facilitate the installation of the first partition plate 30 in place during the manufacturing process. It can be understood that the number of fixing holes is at least one.

[0100] In one embodiment, the number of fixing holes is five, including four corner holes 81 and one center hole 82. Correspondingly, the number of fixing protrusions is also five, including 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 first opening 21 side to the second opening 22 side.

[0101] Please refer to Figures 2 to 11 and Figures 15 to 18 , 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 D1 of the air inlet is larger than the diameter D2 of the oil drain port 61. The air inlet of the conical cylinder 60 is communicated 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 airflow 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 airflow 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 airflow 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 airflow will dissipate, so that the airflow moves upward under the action of its own buoyancy and flows into the lower end opening of the return air cylinder 50, and then flows out from the upper end opening of the return air cylinder 50.

[0102] The diameter D2 of the oil drain port 61 of the conical cylinder 60 is smaller than the diameter D3 of the return air cylinder 50. In this way, the airflow 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 airflow, which will deteriorate the oil-gas separation effect of the oil separator 1. When the airflow contacts the inner wall of the conical cylinder 60, it will also adhere to the inner wall of the conical cylinder 60, and 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, this increases the adhesion area of the airflow, so that the oil-gas separation effect of the conical cylinder 60 is improved.

[0103] Further, in one embodiment, the length L1 of the cyclone cylinder is greater than the length L2 of the guide cylinder, and the length L3 of the conical cylinder is also greater than the length L2 of the guide cylinder.

[0104] Please refer to Figures 2 to 11 and Figures 15 to 18, the oil separator 1 further includes at least one flow guide cylinder 70. The axis of the flow guide cylinder 70 is parallel to the axis of the main cylinder body 10. The flow guide cylinder 70 is a straight cylinder structure with both upper and lower ends open. Each flow guide cylinder 70 is disposed 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 end opening of the flow guide cylinder 70 is butted against the second opening 22 of the cyclone cylinder 20, and the lower end opening of the flow guide cylinder 70 is butted against the air inlet of the conical cylinder 60. The function of the flow 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 flow guide cylinders 70 is the same as the number of the cyclone cylinders 20. The flow guide cylinders 70 and the cyclone cylinders 20 are in one-to-one correspondence. In one embodiment, the number of the flow guide cylinders 70 can be 1, 2, 3, 5, 6, 7 or 8. In this embodiment, the return air cylinder 50, the cyclone cylinders 20, the conical cylinders 60 and the flow guide cylinders 70 are all 4 in number.

[0105] In one embodiment, the cyclone cylinder 20, the flow 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 flow 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 flow 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.

[0106] In one embodiment, the return air cylinder 50 extends into the flow guide cylinder 70. Since the return air cylinder 50 is a circular straight cylinder, compared with the conical cylinder 60, the flow guide cylinder 70 is more convenient to cooperate with the return air cylinder 50, and the lower end of the return air cylinder 50 can also be made lower. The return air cylinder 50 extending into the flow guide cylinder 70 can further prevent the air flow in the cyclone cylinder 20 from flowing out directly from the lower end opening of the return air cylinder 50 without sufficient swirling in the cyclone cylinder 20. At the same time, the flow 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 flow guide cylinder 70, and the flow guide cylinder 70 also has the effect of oil-gas separation. By providing 4 flow guide cylinders 70, this increases the adhesion area of the air flow and improves the oil-gas separation effect of the flow guide cylinder 70.

[0107] 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).

[0108] On the inner circumferential surface of the main cylinder body 10, an upper limit projection and a lower limit projection are provided, and the upper limit projection and the lower limit projection are arranged at intervals along the axial direction of the main cylinder body 10. Specifically, the upper limit projection is arranged on the upper side of the first partition plate 30, and the lower limit projection is arranged on the lower side of the second partition plate 40. The upper limit projection and the lower limit projection form a limit groove to fix the separation component in the cylinder cavity 11. The upper limit projection and the lower limit projection can be integrally formed with the main cylinder body by a spinning process. In one embodiment, both the upper limit projection and the lower limit projection are annular, so that they can be directly integrally formed with the main cylinder body by a spinning process.

[0109] 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-connected units, heat pumps, water heaters, pool machines, etc.

[0110] In one embodiment, the HVAC device is an air conditioner and includes an evaporator, a compressor and a condenser. The oil separator 1 is communicated with 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 communicates 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 opposite to each other. 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.

[0111] According to the HVAC device of 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.

[0112] 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, characterized in that, comprising: a main cylinder body, the main cylinder body forming a cylinder cavity, a total air inlet and an air outlet communicating with the cylinder cavity; at least one cyclone cylinder, the cyclone cylinder being disposed in the cylinder cavity and spaced from the inner peripheral surface of the main cylinder body, a first cyclone channel being formed between the outer peripheral surface of the cyclone cylinder and the inner peripheral surface of the main cylinder body, the total air inlet communicating with the first cyclone channel to allow external air flow to enter the first cyclone channel, a second cyclone channel being formed in the cyclone cylinder, the first cyclone channel communicating with the second cyclone channel, and the second cyclone channel communicating with the air outlet.

2. The oil separator according to claim 1, characterized in that, the radial cross-section of the cyclone cylinder is spiral.

3. The oil separator according to claim 1, characterized in that, the cyclone direction of the first cyclone channel is the same as that of the second cyclone channel.

4. The oil separator according to claim 1, characterized in that, the oil separator includes a first partition plate and a second partition plate, the first partition plate and the second partition plate being spaced along the axial direction of the cylinder cavity, the first partition plate, the second partition plate, the cyclone cylinder and the cylinder cavity enclosing to form the first cyclone channel, the cyclone cylinder being formed with a first opening and a second opening spaced along its axial direction, the first opening being disposed close to the air outlet, and the first partition plate closing the first opening of the cyclone cylinder and enclosing with the cyclone cylinder to form the second cyclone channel.

5. The oil separator according to claim 4, characterized in that, the first partition plate covers the upper side of the first opening of the cyclone cylinder, the second partition plate being formed with at least one through hole, the through holes corresponding to the cyclone cylinders one by one, one end of the cyclone cylinder close to the second opening penetrating through the through hole, and the rotating cylinder being hermetically connected to the second partition plate.

6. The oil separator according to claim 5, characterized in that, the cyclone cylinder includes a side opening, the side opening being disposed on the outer peripheral surface of the cyclone cylinder, and the side opening communicating the first cyclone channel with the second cyclone channel.

7. The oil separator according to claim 6, characterized in that, an oil return hole is formed in the plate surface of the second partition plate, the oil return hole being disposed outside the side opening of the cyclone cylinder and communicating with the side opening.

8. The oil separator according to claim 5, characterized in that, an oil return hole is formed on the outer peripheral surface of the second partition plate.

9. The oil separator according to claim 6, characterized in that, the oil separator further includes at least one air return cylinder, the air return cylinder communicating with the air outlet, the air return cylinders being provided corresponding to the cyclone cylinders one by one and the air return cylinders being disposed in the cyclone cylinders, and the lower end of the air return cylinder being lower than the lower end of the side opening.

10. The oil separator according to claim 9, characterized in that, the first partition plate is formed with at least one air return hole, the air return holes corresponding to the air return cylinders one by one, and the air return holes being hermetically connected to the outer peripheral surface of the air return cylinders.

11. The oil separator according to claim 9, characterized in that, the oil separator further comprises at least one conical cylinder, the conical cylinder includes an air inlet and an oil drain port arranged opposite to each other along its axis, the air inlet is arranged close to the air outlet of the main cylinder body, the diameter of the air inlet is larger than the diameter of the oil drain port, and the air inlet of the conical cylinder is communicated with the second opening of the cyclone cylinder.

12. The oil separator according to claim 11, characterized in that, the diameter of the oil drain port of the conical cylinder is smaller than the diameter of the return air cylinder.

13. The oil separator according to claim 11, characterized in that, the oil separator further comprises at least one guide cylinder, and each guide cylinder is arranged between one cyclone cylinder and one conical cylinder and is communicated with both the cyclone cylinder and the conical cylinder.

14. A heating, ventilation and air conditioning (HVAC) device, characterized in that, the HVAC device includes the oil separator according to any one of claims 1-12.

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