An oil separator

Abstract

The present invention discloses an oil separator, comprising: an oil separator main body, in which a two-stage separation structure and a primary oil return structure are integrally arranged. Among them, the two-stage separation structure includes a built-in primary centrifugal separation structure and a secondary condensation filtration separation structure; the primary oil return structure includes a primary centrifugal separation oil return structure and a secondary condensation filtration separation oil collecting structure that are interconnected. This oil separator realizes the separation function of the integration of centrifugal and condensation filtration inside a relatively small oil separator main body through the integral arrangement of the two-stage separation structure and the primary oil return structure. Moreover, the two separation functions are carried out sequentially to achieve multiple separations, and the hierarchical design ensures the filtration effect. The design of the primary oil return structure can effectively control the oil return amount and improve the reliability of oil return. In addition, this oil separator has a compact structure, good separation effect and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors for refrigeration systems, and more particularly to an oil separator. Background Art

[0002] In an air-conditioning refrigeration system, it is very necessary for the compressor to return oil in a timely manner. Therefore, a highly efficient oil separator can greatly improve the oil return reliability of the refrigeration system. Especially in low-temperature and ultra-low-temperature systems below -60°C, after the lubricating oil of the compressor enters the low-temperature evaporator, the common compressor oil will flocculate and even condense on the inner surface of the evaporator, greatly reducing the heat exchange capacity of the evaporator. Therefore, configuring an efficient oil separator between the compressor exhaust port and the condenser not only optimizes and improves the performance of the low-temperature system, but also can greatly improve the oil return reliability of the low-temperature refrigeration system. With the increasing demand for low-temperature storage equipment and low-temperature test equipment in China, the requirements for the low-temperature performance and reliability of low-temperature refrigeration equipment are also getting higher and higher.

[0003] However, the existing oil separators have problems such as poor separation effect, uncontrollable oil return in the low-temperature refrigeration system, resulting in poor oil return reliability. At the same time, the existing oil separators also have problems such as complex structure and large volume and lack of compactness. The design requirement for a super-high-efficiency oil separator has also become an essential topic for technological research and development.

[0004] Chinese Patent Document (Publication Date: September 25, 2013, Publication Number: CN 203216172U) discloses a centrifugal filtration type oil separator, belonging to the field of refrigeration accessories. The existing oil separator has the defect of low separation efficiency. The utility model includes a tank body, a filtering device, an air inlet pipe and an air outlet pipe. The top and bottom of the tank body are provided with openings. The air inlet pipe is installed in the bottom opening of the tank body, and the air outlet pipe is installed in the top opening of the tank body. The air outlet pipe extends into the inner cavity of the tank body. The air outlet pipe located in the inner cavity of the tank body is in a trumpet-shaped opening, and the air outlet pipe located outside the tank body is connected to a driving mechanism. The driving mechanism drives the air outlet pipe to rotate. The filtering device is fixed on the inner cavity wall of the tank body and is located below the air outlet pipe.

[0005] Although the above technical solution discloses a centrifugal filtration type separator, the separator mainly uses a filter screen for filtration and realizes centrifugal separation through the rotation of the air outlet pipe. For the above structure, the air outlet pipe needs to be driven by a driving mechanism to achieve centrifugal separation, with a complex structure. Moreover, its air inlet pipe is arranged at the bottom of the tank body, and it is easy for the oil liquid to flow back into the air inlet pipe during the dripping process of the oil liquid, reducing the efficiency of the separator. Summary of the Invention

[0006] The object of the present invention is to solve the problems of existing oil separators, such as low separation efficiency, poor separation effect, uncontrollable oil return in the low-temperature oil return system, poor oil return reliability, as well as complex structure, large volume and non-compact structure, and to provide an oil separator that realizes secondary separation and one-time oil return, can effectively control the oil return amount, has a compact structure, good separation effect and high efficiency.

[0007] The technical solution adopted by the present invention to achieve its invention object is: an oil separator, comprising:

[0008] An oil separator main body,

[0009] A two-stage separation structure and a one-time oil return structure are integrally arranged inside the oil separator main body.

[0010] Among them, the two-stage separation structure includes a built-in primary centrifugal separation structure and a secondary condensation filtration separation structure;

[0011] The one-time oil return structure includes a primary centrifugal separation oil return structure and a secondary condensation filtration separation oil collecting structure that are interconnected.

[0012] In this oil separator, through an integrated arrangement, a two-stage separation structure and a one-time oil return structure are integrally arranged inside the oil separator main body, so that the high-speed oil-gas discharged from the compressor exhaust port first enters the built-in primary centrifugal separation structure for centrifugal separation. The centrifugal separation is achieved by the high speed of the oil-gas hitting the built-in primary centrifugal separation structure, and most of the compressor oil is preliminarily separated. Inside the built-in primary centrifugal separation structure, the compressor refrigeration oil flows downward under the dual action of centrifugal force and gravity and flows into the primary centrifugal separation oil return structure; at the same time, the refrigerant gas with a small amount of compressor lubricating oil enters the secondary condensation filtration separation structure for secondary separation. The compressor lubricating oil condenses into oil droplets on the secondary condensation filtration separation structure and drips into the secondary condensation filtration separation oil collecting structure to converge with the oil liquid inside the primary centrifugal separation oil return structure, realizing the overall control of oil return and ensuring the reliable control of the oil return amount. The refrigerant gas enters the refrigeration system after being separated by the secondary condensation filtration separation structure. This oil separator realizes two oil separation functions of centrifugal type and condensation filtration type inside a relatively small oil separator main body, and the two separation functions are carried out in sequence, ensuring the filtration effect. At the same time, a one-time oil return structure design is realized, and the one-time oil return can effectively control the oil return amount and improve the oil return reliability.

[0013] Preferably, the built-in primary centrifugal separation structure includes a built-in centrifugal separator disposed inside the main body of the oil separator; a primary separation chamber is provided inside the built-in centrifugal separator; an upper through hole is provided in the upper part of the built-in centrifugal separator; and a lower through hole is provided in the lower part of the built-in centrifugal separator. The primary centrifugal separation structure is mainly achieved by arranging a built-in centrifugal separator inside the main body of the oil separator. A primary separation chamber is provided inside the built-in centrifugal separator, and the inner wall of the primary separation chamber is used to perform centrifugal separation on the high-speed oil-gas mixture. There is no need to additionally set a driving mechanism. Moreover, in order to achieve two-stage separation, an upper through hole is provided in the upper part of the built-in centrifugal separator. The upper through hole is used to connect the primary separation and the secondary separation, so that the refrigerant gas with a small amount of compressor lubricating oil after primary centrifugal separation can enter the secondary condensation filtration separation structure through the upper through hole for secondary condensation filtration separation. The lower through hole is provided to form a primary oil return structure, so that the compressed oil separated by secondary condensation filtration and primary centrifugation can converge and return oil through an outlet, thereby realizing the control of the oil return amount.

[0014] Preferably, the built-in centrifugal separator is integrally arranged in an inverted bottle body structure with a centrifugal oil separation main body and a centrifugal oil separation outlet. The lower through hole is arranged above the centrifugal oil separation outlet, and the centrifugal oil separation outlet extends to the outside of the main body of the oil separator. The inverted bottle body structure of the built-in centrifugal separator is convenient for realizing the centrifugal separation of oil and gas, and at the same time, it is also convenient for collecting the separated oil. The centrifugal oil separation main body is mainly used to form a primary separation chamber, and centrifugal separation can be carried out inside the primary separation chamber. The centrifugal separation can be single-stage centrifugal separation or two-stage centrifugal separation. The centrifugal oil separation outlet is used to realize primary oil return, thereby effectively controlling the oil return amount. In order to realize primary oil return and ensure the control of the oil return amount, at the same time, in order to keep the oil inside the separator always maintained at the set oil control amount, a lower through hole is provided in the lower part of the centrifugal oil separation main body. The lower through hole can collect the oil separated by secondary condensation filtration to the centrifugal oil separation outlet, and can also realize the design of oil control amount. During normal use, the oil inside the separator is controlled to submerge the lower through hole enough to block the lower through hole with the oil, so as to ensure that the refrigerant gas with part of the compressor lubricating oil after centrifugal separation inside the centrifugal oil separation main body can only flow out through the upper through hole and enter the secondary separation, thereby improving the separation efficiency of the overall separator.

[0015] Preferably, the centrifugal oil outlet of the inverted bottle body structure constitutes a primary centrifugal separation oil return structure, and the lower part of the oil separator body and the lower through hole constitute a secondary condensation filtration separation oil collection structure. The primary centrifugal separation oil return structure is mainly the inverted bottle body structure. After the oil and gas are separated in the primary separation chamber of the centrifugal oil separator body, they flow along the inner wall of the primary separation chamber to the centrifugal oil outlet, thus realizing oil return. The secondary condensation filtration separation oil collection structure is mainly composed of the lower part of the oil separator body, the lower through hole and the centrifugal oil outlet. The oil liquid separated in the secondary stage flows into the lower part of the oil separator body under the action of gravity. After being mixed with the oil liquid controlled by the lower part, it enters the primary separation chamber through the lower through hole and returns to the compressor through the centrifugal oil outlet, thus realizing primary oil return.

[0016] Preferably, the upper through hole is horizontally penetrated along the radial direction of the built-in centrifugal separator, and a secondary centrifugal separation structure is formed between the upper through hole and the top of the primary separation chamber; or the upper through hole is vertically penetrated along the axis of the built-in centrifugal separator, and an oil and gas vortex structure is formed between the upper through hole and the top of the primary separation chamber. The upper through hole can be designed into different shapes such as horizontally penetrated and vertically penetrated according to different needs. In order to achieve a better centrifugal separation effect, that is, to realize secondary centrifugal separation inside the primary separation chamber, the upper through hole is generally set as a horizontally penetrated structure. In order to increase the effect of secondary condensation filtration separation, the upper through hole can be set as a vertically penetrated structure. Such a structure can realize the formation of an oil and gas vortex structure at the top of the primary separation chamber after primary centrifugal separation, and can realize more effective condensation filtration separation with the secondary condensation type filter separator, thus ensuring the separation effect and improving the separation efficiency.

[0017] Preferably, the secondary condensation filtration separation structure includes a secondary condensation type filter separator integrated above the primary centrifugal separation structure. The secondary condensation type filter separator is integrally in a planar structure, an arc structure or a columnar structure; the secondary condensation type filter separator includes at least one layer of oil-repellent mesh layer and multiple layers of filter layers. The secondary condensation filtration separation structure is integrated above the primary centrifugal separation structure, which not only realizes the integrated design of the oil separator, can effectively reduce the volume of the separator, make the separator structure more compact, but more importantly, such a design structure is to ensure the separation effect. Since the oil and gas entering the intake pipe from the compressor exhaust have a high speed, the primary separation first performs centrifugal separation, which can separate most of the oil liquid by centrifugation. The unseparated part of the oil liquid flows upward with the gas, and the secondary condensation filtration separation can separate it completely from the gas. Multiple separations and hierarchical designs realize not only the simple superposition of two separation methods of centrifugal separation and condensation filtration separation, but also the effective integration of multiple separation methods, maximizing the separation effect.

[0018] Preferably, the oil-repellent mesh layer is made of an oil-non-sticking mesh wire material, and an oil-repellent capillary layer is provided on the surface of the oil-repellent mesh layer; the oil-repellent mesh layer is a pore mesh structure, a launch mesh structure, or a spiral mesh structure. The design of the oil-repellent mesh layer is mainly to enable the oil liquid to condense during the impact process and not stick to the oil, and can directly drip under the action of gravity. The oil-repellent mesh layer does not stick to the oil, and the refrigerant gas will not carry away the oil liquid during the flow process, thereby ensuring that the secondary condensation type filter separator can more effectively achieve the separation purpose during the condensation filtration process. The oil-repellent mesh layer can be designed in a variety of different structural shapes according to the needs of different separators.

[0019] Preferably, the oil separator main body includes a housing assembly. The housing assembly includes an oil separation outer housing, an intake pipe, and an outlet pipe. A secondary separation chamber is provided inside the oil separation outer housing. The intake pipe is provided in the middle of the oil separation outer housing, and the outlet pipe is provided at the upper part of the oil separation outer housing; an oil separation upper end cover and an oil separation lower end cover are respectively provided at the upper and lower ends of the oil separation outer housing. The oil separator main body mainly includes an oil separation outer housing, an intake pipe, and an outlet pipe. By reasonably arranging the positions of the intake pipe and the outlet pipe, the most effective filtration effect can be ensured.

[0020] Preferably, the intake pipe is arranged deviating from the center line of the primary centrifugal separation structure. The outlet end of the intake pipe extends into the primary centrifugal separation structure, and an inclined diversion port is provided at the outlet end of the intake pipe and forms a tangential rotation entry structure with the primary centrifugal separation structure. The intake pipe is used to introduce the high-speed oil and gas discharged from the compressor exhaust pipe into the primary separation chamber to ensure that the oil and gas entering the primary separation chamber can achieve effective centrifugal separation. The intake pipe is not arranged along the center line of the primary separation chamber, but deviates from the center line and is close to the inner cavity wall of the primary separation chamber. Moreover, its outlet generally extends to the middle position of the primary separation chamber cavity. At the same time, an inclined diversion port capable of tangential entry is provided at the outlet end of the intake pipe, so that the high-speed entering oil and gas can form a greater rotational centrifugal force and collide with the inner cavity wall of the primary separation chamber to achieve centrifugal separation of most of the oil liquid.

[0021] Preferably, the outlet pipe is arranged deviating from the center line of the secondary condensation type filter separation structure, and an inclined intake port is provided at the inlet end of the outlet pipe and forms a tangential vortex output structure. The outlet pipe also deviates from the center line of the secondary separation chamber, so that the refrigerant gas without oil liquid after filtration can enter the refrigeration system from the outlet pipe in a tangential vortex manner.

[0022] The beneficial effects of the present invention are as follows: The oil separator integrates a two-stage separation structure and a primary oil return structure inside the main body of the oil separator, achieving a separation function that combines centrifugal and condensation filtration within a relatively small main body of the oil separator. Moreover, the two separation functions are carried out sequentially, realizing multiple separations. The hierarchical design ensures the filtration effect, and the design of the primary oil return structure can effectively control the oil return volume and improve the reliability of oil return. In addition, the oil separator has a compact structure, good separation effect, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. is a schematic structural diagram of the oil separator of the present invention;

[0024] Figure 2 FIG. is a top view of the oil separator of the present invention;

[0025] Figure 3 FIG. is a schematic structural diagram of the separation process of the oil separator of the present invention;

[0026] Figure 4 FIG. is a schematic structural diagram of the oil-repellent mesh layer in the present invention;

[0027] Figure 5 FIG. is a schematic structural diagram of the primary filter screen in the present invention;

[0028] Figure 6 FIG. is a schematic structural diagram of the secondary filter screen in the present invention;

[0029] Figure 7 FIG. is a schematic structural diagram of the oil separator in Embodiment 2 of the present invention;

[0030] Figure 8 FIG. is a schematic structural diagram of the oil-repellent mesh layer in Embodiment 2 of the present invention;

[0031] Figure 9 FIG. is a schematic structural diagram of the oil-repellent mesh layer in Embodiment 3 of the present invention;

[0032] In the figure: 1. Oil separation outer casing, 2. Upper end cover of oil separation, 3. Lower end cover of oil separation, 4. Inlet pipe, 5. Outlet pipe, 6. Built-in centrifugal separator, 7. Primary separation chamber, 8. Inclined diversion port, 9. Centrifugal oil separation main body, 10. Centrifugal oil separation outlet, 11. Upper through hole, 12. Lower through hole, 13. Secondary separation chamber, 14. Secondary condensation filtration separator, 15. Oil-repellent mesh layer, 16. Primary filter screen, 17. Secondary filter screen, 18. Oil-repellent capillary layer, 19. Inclined air inlet, 20. Oil liquid, 21. Gas, 22. Wire mesh. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following describes various aspects of the present invention in detail through specific embodiments in conjunction with the drawings.

[0034] Embodiment 1:

[0035] In Figure 1 , Figure 2 , Figure 3 In the illustrated embodiment, an oil separator is disposed between the compressor exhaust port and the condenser and includes: an oil separator main body, in which a two-stage separation structure and a primary oil return structure are integrally provided. Among them, the two-stage separation structure includes a built-in primary centrifugal separation structure and a secondary condensation filtration separation structure; the primary oil return structure includes a primary centrifugal separation oil return structure and a secondary condensation filtration separation oil collection structure that communicate with each other.

[0036] The oil separator main body includes a housing assembly. The housing assembly includes an oil separator outer housing 1, an oil separator upper end cover 2, and an oil separator lower end cover 3. An intake pipe 4 is provided in the middle of the oil separator outer housing 1. The intake pipe 4 communicates with the compressor exhaust port. An outlet pipe 5 is provided in the upper part of the oil separator outer housing 1. The outlet pipe 5 communicates with the refrigeration system. The intake pipe 4 and the outlet pipe 5 are parallel to each other and horizontally arranged. Among them, the intake pipe 4 and the outlet pipe 5 are respectively offset from the center of the oil separator outer housing 1, that is, the intake pipe 4 and the outlet pipe 5 do not extend along the center line of the oil separator outer housing 1, but are offset from the center line of the oil separator outer housing 1 and parallel to the center line of the oil separator outer housing. Such a setting structure is for achieving good centrifugal separation and gas discharge.

[0037] The built-in primary centrifugal separation structure includes a built-in centrifugal separator 6 arranged inside the main body of the oil separator; specifically, a built-in centrifugal separator 6 is arranged coaxially with the vertical axis of the housing inside the oil separator housing 1 along the vertical axis of the housing. A primary separation chamber 7 is arranged inside the built-in centrifugal separator 6. The outlet end of the intake pipe 4 extends into the primary separation chamber 7 of the built-in centrifugal separator 6, and an inclined diversion port 8 is arranged at the outlet end of the intake pipe 4. The end of the inclined diversion port 8 extends to the built-in centrifugal separator 6. Generally, the inclined diversion port starts to incline after extending into the primary separation chamber 7 until it extends beyond the center line of the primary separation chamber 7. Basically, in the horizontal projection, the inclined diversion port occupies one-fourth of the cavity area of the primary separation chamber. Since the intake pipe deviates from the center line of the primary separation chamber, therefore, the oil-gas mixture with a relatively high speed flows rapidly into the primary separation chamber through the inclined diversion port and forms a centrifugal separation inside the primary separation chamber. Specifically, since the oil-gas mixture entering the intake pipe 4 has a relatively high speed, the oil-gas mixture with a relatively high speed can enter the primary separation chamber 7 tangentially and rotationally through the inclined diversion port 8, so that the oil-gas mixture can rapidly impact the wall of the primary separation chamber 7 of the built-in centrifugal separator under the action of the velocity centrifugal force, thereby realizing centrifugal separation on the wall of the primary separation chamber 7. The oil liquid flows downward along the primary separation chamber 7 under the action of gravity, while the refrigerant gas is separated under the action of centrifugal force and flows upward.

[0038] The built-in centrifugal separator 6 is integrally arranged in an inverted bottle body structure with a centrifugal oil separation main body 9 and a centrifugal oil separation outlet 10. An upper through hole 11 penetrating the cavity of the centrifugal oil separation main body is arranged at the upper part of the centrifugal oil separation main body 9, and the setting direction of the upper through hole 11 is the same as the gas inlet direction of the intake pipe 4.

[0039] A lower through hole 12 penetrating the cavity of the centrifugal oil separation main body is arranged on the centrifugal oil separation main body 9 at the lower part of the centrifugal oil separation main body 9 and above the centrifugal oil separation outlet 10. The setting height of the lower through hole 12 should be such that the designed reasonable oil control return flow can block the lower through hole 12. The lower centrifugal oil separation outlet 10 of the built-in centrifugal separator 6 extends out of the housing and is used to communicate with the compressor.

[0040] The centrifugal oil separation outlet 10 of the inverted bottle body structure constitutes a primary centrifugal separation oil return structure, and the lower part of the oil separator main body and the lower through hole 12 constitute a secondary condensation filtration separation oil collecting structure.

[0041] The described secondary condensation filtration and separation structure includes a secondary condensation type filter separator 14 integrated above the primary centrifugal separation structure. The secondary condensation type filter separator 14 is generally in a planar structure, an arc structure or a cylindrical structure. Specifically, a secondary separation chamber 13 is formed between the inner wall of the oil separation housing 1 and the outer wall of the built-in centrifugal separator 6. Inside the oil separation housing 1 and within the secondary separation chamber 13 above the built-in centrifugal separator 6, a secondary condensation type filter separator 14 is provided. The secondary condensation type filter separator 14 includes at least one oil-repellent mesh layer 15 and multiple filter layers. In this embodiment, two filter meshes are provided, which are the oil-repellent mesh layer 15, the primary filter mesh 16 and the secondary filter mesh 17 from bottom to top. The oil-repellent mesh layer 15 is in a planar structure or an arc structure. The oil-repellent mesh layer 15 is in a radiation mesh structure, that is, the mesh wires of the oil-repellent mesh layer are radially emitted outward with the center of the oil-repellent mesh layer as the center point; or the oil-repellent mesh layer 15 is in a spiral mesh structure, that is, the oil-repellent mesh layer is in a planar spiral structure starting from the center of the oil-repellent mesh layer; or the oil-repellent mesh layer 15 is in a hole mesh structure.

[0042] As Figure 4 shown, in this embodiment, the oil-pressing mesh layer 15 is in a hole mesh structure. The hole mesh structure can be a circular hole mesh, a rectangular hole mesh, or a grid structure. The mesh wires of the oil-repellent mesh layer 15 are made of non-oil-sticking synthetic plastic or plastic material. An oil-repellent capillary layer 18 is provided on the surface of the oil-repellent mesh layer 15. During the oil-gas separation process, due to the setting of the oil-repellent capillary layer 18, the oil liquid condensed on the oil-repellent mesh layer 15 will not stick to the mesh wires and will drip into the interior of the secondary separation chamber 13 under the action of gravity, realizing the design of two-stage separation and one-stage oil return.

[0043] The primary filter mesh 16 is arranged in a grid structure, a radial structure or a spiral structure. The primary filter mesh 16 is made of copper tubes. As Figure 5 shown, in this embodiment, the primary filter mesh is in a grid structure.

[0044] As Figure 6 shown, in this embodiment, the secondary filter mesh 17 is in a copper tube mesh structure, and the mesh holes of the secondary filter mesh 17 are smaller than those of the primary filter mesh 16, thereby realizing the step-by-step separation of oil and gas and enabling effective filtration and separation of oil and gas.

[0045] The outer shapes of the oil-repellent mesh layer 15, the primary filter mesh 16 and the secondary filter mesh 17 are matched. For example, the oil-repellent mesh layer 15, the primary filter mesh 16 and the secondary filter mesh 17 can all be arranged in a planar structure, or can be arranged in an arc structure, or can also be arranged in a cylindrical structure, etc. In this embodiment, the oil-repellent mesh layer 15, the primary filter mesh 16 and the secondary filter mesh 17 are arranged in a planar structure.

[0046] As Figure 3As shown, the oil-gas mixture after primary centrifugal separation by the built-in centrifugal separator 6 is subjected to secondary separation by the secondary condensation filtration separator 14. The oil liquids separated in the primary and secondary separations both enter the secondary separation chamber 13 for aggregation. The oil converges at the bottom of the secondary separation chamber and the primary separation chamber, and returns to the oil compressor at once through the centrifugal oil outlet 10 at the bottom of the built-in centrifugal separator. Thus, two-stage separation and one-stage oil return are achieved, enabling effective control of the oil return volume, and solving the problems of complex structure and inability to reasonably control the oil return volume existing in the existing separators with oil return through two parallel pipelines.

[0047] The outlet pipe 5 is arranged above the secondary condensation filtration separator 14. The inlet end of the outlet pipe 5 extends to the diameter where the axis of the secondary separation chamber 13 is located. An inclined air inlet 19 is arranged at the inlet end of the outlet pipe 5. The projection of the opening of the inclined air inlet 19 on the horizontal plane faces the axis of the secondary separation chamber 13, and its inlet end crosses the center line of the secondary separation chamber. Since the outlet pipe is arranged deviating from the center line of the secondary separation chamber, the inclined air inlet 19 can achieve effective diversion of the gas separated by filtration. Even if the gas has a certain eddy structure, the refrigerant gas can flow out to the maximum extent and then enter the refrigeration system.

[0048] In this embodiment, the upper through hole is arranged horizontally. A secondary centrifugal separation structure is formed between the upper through hole 11 and the top of the primary separation chamber 7. When the upper through hole 11 is horizontal, due to the centrifugal force of the vortex, the upper oil-gas mixture will impact the top wall of the built-in centrifugal separator 6 during the upward movement, generating secondary centrifugal separation. The oil liquid drips downward under the action of gravity, and the oil-gas mixture after secondary centrifugal separation is dispersed to both sides through the horizontal upper through hole 11 and flows out of the primary separation chamber 7 into the secondary separation chamber 13, and then flows upward to collide with the secondary condensation filtration separator to achieve secondary filtration separation.

[0049] As Figure 3As shown in the figure, the specific usage process of this oil separator is as follows: During the exhaust process of the compressor, the oil-gas mixture discharged enters the first-stage separation chamber 7 through the intake pipe 4 for primary centrifugal separation. During the primary centrifugal separation process, it can undergo one centrifugal separation or two centrifugal separations. Under the dual action of centrifugal force and gravity, the compressor refrigeration oil flows downward and into the bottom of the built-in centrifugal separator 6, where it accumulates inside the first-stage separation chamber 7 of the built-in centrifugal separator 6 and seals the lower through-hole 12 of the built-in centrifugal separator. During normal operation, the oil levels inside the first-stage separation chamber 7 and the second-stage separation chamber 13 are both higher than the lower through-hole 12 to effectively control the oil return amount. At the same time, after primary centrifugal separation, the refrigerant gas with a small amount of compressor lubricating oil enters the second-stage separation chamber 13 through the upper through-hole 11 of the built-in centrifugal separator 6. Since the lower through-hole 12 is blocked by the compressor refrigeration oil, the refrigerant gas can only flow upward under the action of vortex and impact the secondary condensation filtration separator 14 inside the second-stage separation chamber 13 for secondary condensation filtration separation. Since the secondary condensation filtration separator is provided with an oil-repellent mesh layer 15, a first-stage filter mesh 16, and a second-stage filter mesh 17, during the filtration process, the compressor lubricating oil condenses into oil droplets on the oil-repellent mesh layer 15, and the oil droplets flow to the bottom of the second-stage separation chamber 13 under the action of gravity and converge with the oil liquid separated from the first-stage separation chamber 7. The refrigerant gas 21 then passes through the secondary condensation filtration separator, enters the upper part of the second-stage separation chamber, and flows out through the outlet pipe 5 and into the refrigeration system.

[0050] This oil separator mainly utilizes the different densities of lubricating oil and refrigerant evaporation, as well as the sudden expansion of the channel cross-section and the sudden drop in the gas flow velocity. The barrel diameter of the oil separator is larger than the diameter of the high-pressure exhaust pipe, that is, the intake pipe of the oil separator. Preferably, the barrel diameter of the built-in centrifugal oil separator is set to 5 - 20 times that of the intake pipe, so that the flow velocity of the vapor entering the built-in centrifugal oil separator drops from the original 15 - 30 m / s to 0.5 - 1.5 m / s; at the same time, the flow direction is changed, and the compressor lubricating oil with a larger density is separated and precipitated at the bottom of the oil separator. The refrigerant gas with a part of the compressor lubricating oil undergoes secondary condensation filtration separation through the secondary condensation filtration separator, causing the oil vapor to condense into oil droplets and achieving secondary condensation filtration separation, effectively enhancing the oil separation effect.

[0051] This oil separator realizes the function of two-stage separation inside an oil separator device. The built-in centrifugal oil separator is arranged inside the second-stage separation chamber, and the secondary condensation filtration separator is arranged above the built-in centrifugal separator. The oil liquid 20 separated by centrifugal separation and condensation filtration is aggregated at the bottom of the separator, realizing the connection between centrifugal separation and condensation filtration separation, and thus realizing the setting of secondary separation and one-time oil return.

[0052] Embodiment 2:

[0053] InFigure 7 In the illustrated embodiment, the technical solution in this embodiment is substantially the same as that in Embodiment 1, except that in this embodiment, the upper through hole 11 of the built-in centrifugal separator is vertically arranged along the axis of the built-in centrifugal separator 6 .

[0054] Since the upper through hole is arranged vertically along the axis, the upper through hole 11 and the top of the primary separation chamber 7 form an oil-gas vortex structure. After the oil and gas pass through the side wall of the primary separation chamber 7 of the built-in centrifugal separator 6 to achieve primary separation, the oil and gas with part of the oil flow upward under the action of centrifugal force, forming an oil-gas vortex on the upper part of the built-in centrifugal separator 6, and the oil-gas vortex can directly hit the secondary condensation filter separator 14 upward through the upper through hole 11 arranged in the axial direction to achieve secondary condensation filter separation. The oil and gas on the upper part of this structure directly undergo secondary separation due to the vortex hitting the secondary condensation filter separator 14.

[0055] In conjunction with the vertically arranged upper through-hole structure, the secondary condensation filter separator 14 is arranged as a whole in an arc-shaped structure. That is, the oil-repellent mesh layer 15, the primary filter mesh 16 and the secondary filter mesh 17 are all arched upwardly shaped arc-shaped structures. Figure 8 As shown, the oil-repellent mesh layer 15 is a launch mesh structure, that is, the mesh wires 22 of the oil-repellent mesh layer are arranged to be launched outward along the diameter direction with the center of the circle of the oil-repellent mesh layer as the center point. The diameter of the mesh wires 22 at the center position is smaller than the diameter at the launch end, and the diameter of the mesh wires is arranged in a progressive structure from the center to the outside of the launch end. An oil-repellent capillary layer 18 is arranged on the surface of the mesh wires.

[0056] The primary filter 16 is of radial structure, and is made of copper tube. When the primary filter 16 is of radial structure, the diameter of the copper tube at the center is smaller than the diameter at the emission end, and the diameter of the copper tube is arranged in an increasing structure from the center to the outside of the emission end. Such a structural arrangement can achieve effective separation of oil and gas. The gas moves upward through the primary filter, and the oil is also blocked by the oil-averse copper tube and will not stick to the copper tube, and drips downward by gravity, achieving secondary separation of oil and gas.

[0057] The secondary filter 17 adopts a copper tube mesh structure, and the mesh openings of the secondary filter 17 are smaller than the mesh openings of the primary filter 16, thereby realizing step-by-step separation of oil and gas, and being able to realize effective filtering and separation of oil and gas.

[0058] Embodiment 3:

[0059] exist Figure 9 In the illustrated embodiment, the technical solution in this embodiment is substantially the same as that in embodiment 1, except that the oil-repellent mesh layer 15 is a spiral structure, that is, the oil-repellent mesh layer is arranged in a planar spiral structure with the center of the circle as the starting point.

[0060] Correspondingly, the primary filter screen 16 is arranged in a spiral structure and made of copper pipes. When the primary filter screen 16 is arranged in a spiral structure, the spiral structure is arranged spirally outward from the center of the filter screen. Such a structural arrangement can effectively separate oil and gas. The gas moves upward through the primary filter screen, while the oil is blocked by the oil-repellent copper pipes and does not adhere to the copper pipes, and drips downward by gravity to achieve secondary separation of oil and gas.

[0061] The secondary filter screen 17 adopts a copper mesh structure, and the mesh holes of the secondary filter screen 17 are smaller than those of the primary filter screen 16, so as to achieve step-by-step separation of oil and gas and effectively filter and separate oil and gas.

[0062] The oil separator described in the above embodiments can achieve two oil separation functions of centrifugal and condensation filtration in the oil separation housing cavity of a relatively small oil separator. First, most of the compressor lubricating oil is preliminarily separated by centrifugation, and then the remaining extremely small part of the compressor lubricating oil is separated by condensation filtration. The two-stage oil separation process greatly improves the separation efficiency of the oil separator. Moreover, the structure of the entire separator is compact. First, the oil separation housing 1, the built-in centrifugal separator, and the intake pipe 4 are assembled, and then the secondary condensation filtration separator, the upper end cover, and the lower end cover are assembled. The assembly and welding are convenient and fast. Moreover, the separator has a good separation effect, can control the oil return amount, and ensures timely oil return of the entire compressor.

[0063] The content described in the embodiments of this specification is only a list of the implementation forms of the inventive concept of the present invention. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to equivalent technical means that those skilled in the art can think of according to the inventive concept of the present invention.

Claims

1. An oil separator, characterized in that Comprising: An oil separator main body, which includes a housing assembly; A two - stage separation structure and a primary oil return structure are integrally arranged inside the oil separator main body. Among them, the two - stage separation structure includes a built - in primary centrifugal separation structure and a secondary condensation filtration separation structure; The built - in primary centrifugal separation structure includes a built - in centrifugal separator arranged inside the oil separator main body; The overall structure of the built - in centrifugal separator is an inverted bottle body, which is provided with a centrifugal oil separation main body and a centrifugal oil separation outlet; a lower through - hole is arranged at the lower part of the built - in centrifugal separator; The secondary condensation filtration separation structure includes a secondary condensation filtration separator integrated above the primary centrifugal separation structure; The primary oil return structure includes a primary centrifugal separation oil return structure and a secondary condensation filtration separation oil collecting structure that are interconnected; The centrifugal oil separation outlet of the inverted bottle body structure constitutes the primary centrifugal separation oil return structure, and the lower part of the oil separator main body and the lower through - hole constitute the secondary condensation filtration separation oil collecting structure.

2. The oil separator according to claim 1, wherein: A primary separation chamber (7) is arranged inside the built - in centrifugal separator (6); an upper through - hole (11) is arranged at the upper part of the built - in centrifugal separator (6).

3. The oil separator according to claim 2, characterized in that: The lower through - hole (12) is arranged above the centrifugal oil separation outlet (10), and the centrifugal oil separation outlet (10) extends to the outside of the oil separator main body (9).

4. The oil separator according to claim 2, characterized in that: The upper through - hole (11) is horizontally penetrated along the radial direction of the built - in centrifugal separator (6), and a secondary centrifugal separation structure is formed between the upper through - hole (11) and the top of the primary separation chamber (7); or the upper through - hole (11) is vertically penetrated along the axis of the built - in centrifugal separator (6), and an oil - gas vortex structure is formed between the upper through - hole (11) and the top of the primary separation chamber (7).

5. An oil separator according to claim 1, characterized in that: The overall structure of the secondary condensation filtration separator (14) is a planar structure, an arc - shaped structure or a columnar structure; the secondary condensation filtration separator (14) includes at least one oil - repellent mesh layer (15) and multiple filter layers.

6. The oil separator according to claim 5, characterized in that: The oil - repellent mesh layer (15) is made of oil - non - sticking mesh wire material, and an oil - repellent capillary layer (18) is arranged on the surface of the oil - repellent mesh layer (15); the oil - repellent mesh layer (15) is a hole - mesh structure, a launch - mesh structure or a spiral - mesh structure.

7. An oil separator according to any one of claims 1 to 6, characterized in that: The housing assembly includes an oil separation outer housing (1), an intake pipe (4) and an outlet pipe (5). A secondary separation chamber (13) is arranged inside the oil separation outer housing (1). The intake pipe (4) is arranged in the middle of the oil separation outer housing (1), and the outlet pipe (5) is arranged at the upper part of the oil separation outer housing (1); an oil separation upper end cover (2) and an oil separation lower end cover (3) are arranged on the oil separation outer housing (1).

8. The oil separator according to claim 7, characterized in that: The intake pipe (4) is arranged deviating from the center line of the primary centrifugal separation structure. The outlet end of the intake pipe (4) extends into the primary centrifugal separation structure, and an inclined diversion port (8) is arranged at the outlet end of the intake pipe (4) and forms a tangential rotation entry structure with the primary centrifugal separation structure.

9. The oil separator according to claim 7, wherein: The described outlet pipe is arranged deviating from the center line of the secondary condensation type filtration and separation structure, and an inclined air inlet (19) is arranged at the inlet end of the outlet pipe (5) and a tangential eddy current output structure is formed.

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