A filter device, a compressor oil return pipe assembly, and a compressor.

Abstract

This invention relates to a filtration device, a compressor oil return pipe assembly, and a compressor in the field of compressor technology. The compressor is an energy-saving compressor applicable to energy-efficient air conditioners. It is used to filter impurities in the oil in the oil circuit. The filtration device includes a filter screen mounting base and a filter screen assembly. The filter screen mounting base has a first end for connecting to the oil circuit and a second end for connecting to the filter screen assembly. An internal oil passage is formed inside the filter screen mounting base, connecting the first and second ends. The filter screen assembly has a cover-like structure with one end closed and the other open, forming a filtration chamber. The flow area of ​​the filtration chamber gradually decreases from the open end to the closed end. The filter screen assembly can continuously and comprehensively filter metallic and non-metallic impurities in the oil throughout the entire oil circulation process, with high flow efficiency and resistance to clogging.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a filter device, a compressor oil return pipe assembly, and a compressor. Background Technology

[0002] In compressor-related technical fields, such as scroll compressor systems, refrigerant oil carries impurities such as metal powder, welding slag, and sludge during circulation. If these impurities are not effectively filtered, they will directly lead to wear on internal moving parts of the compressor (such as the scroll plate, bearings, and shaft seals), and in severe cases, cause jamming, leakage, or complete machine failure. Currently, magnets are used at the end of the oil suction pipe to attract magnetic particles, but magnets remove ferromagnetic impurities by magnetic attraction, which can lead to some particles being missed, and are ineffective against non-magnetic particles (such as copper powder, plastic debris, and oxides). Summary of the Invention

[0003] The technical problem to be solved by the present invention is that in the prior art, a magnet is set at the end of the oil suction pipe to attract magnetic particles. However, the magnet removes ferromagnetic impurities by magnetic attraction, which may result in omissions and is ineffective for non-magnetic particles. Therefore, a filter device, a compressor oil return pipe assembly and a compressor are provided.

[0004] This invention aims to provide a filtration device for filtering impurities in oil when installed in an oil line. The filtration device includes: a filter screen mounting base and a filter screen assembly, wherein: The filter mounting base is provided with a first end for connecting to the oil circuit and a second end for connecting to the filter assembly. An internal oil passage is formed inside the filter mounting base, which runs through the first end and the second end. The filter assembly forms a cover-shaped structure with one end closed and the other end open. The cover-shaped structure encloses a filter chamber. The flow area of ​​the filter chamber gradually decreases from the open end to the closed end. The second end is connected to the open end. The oil in the oil circuit enters the internal oil passage of the filter mounting base from the first end of the filter mounting base, then enters the filter chamber of the filter assembly from the second end of the filter mounting base, and finally flows out from the closed end.

[0005] In some embodiments, the cover-like structure is a semi-hollow spherical structure or a semi-hollow ellipsoidal structure.

[0006] In some embodiments, the filter assembly includes multiple filter surfaces, wherein the mesh size on the multiple filter surfaces gradually decreases along the direction of oil flow.

[0007] In some embodiments, each of the filter screen surfaces is provided with a support member, which is attached to a portion of the filter screen surface.

[0008] In some embodiments, the support member is configured as a strip structure; Multiple support members are provided, and the multiple support members are radially attached to the filter screen surface with any position on the corresponding filter screen surface as the starting point, and / or the multiple support members are attached to the filter screen surface in a surrounding manner.

[0009] In some embodiments, at least one of the multilayer filter screens is configured as a magnetic filter screen for adsorbing metallic impurities in the oil, and / or a magnetic ring is provided on the inner sidewall of the filter screen mounting base for adsorbing metallic impurities in the oil.

[0010] In some embodiments, the flow area of ​​the internal oil passage gradually increases from the first end to the second end; The internal oil passages and the filter cavity form a spherical or ellipsoidal cavity.

[0011] In some embodiments, the first end is detachably connected to the oil passage, and the second end is detachably connected to the open end.

[0012] In some embodiments, the second end is configured as a groove structure, and the open end of the filter assembly is configured as a protrusion structure that detachably connects to the groove.

[0013] In some embodiments, one end of the connecting member is connected at the first end; An annular groove is provided on the inner sidewall of the other end of the connecting member, and a sealing ring is provided in the annular groove. The end of the oil passage extends into the connecting member, and the outer sidewall of the oil passage abuts against the inner sidewall of the sealing ring; and / or, the other end of the connecting member is screwed to the oil passage.

[0014] In some embodiments, a compressor oil return pipe assembly is provided, comprising: Return oil pipeline; The above-mentioned filtration device; The first end of the filter device is detachably connected to the oil outlet of the return oil pipeline.

[0015] In some embodiments, a compressor is provided, comprising: The above-mentioned filtration device; Or, the aforementioned return oil pipe assembly; At least a portion of the filter is located in the oil return sump at the bottom of the compressor.

[0016] The solution provided by this invention has the following advantages compared with the prior art: The filtration device is designed to consist of a filter mounting base and a filter assembly. The first end of the filter mounting base is connected to the oil circuit. The filter assembly can continuously and comprehensively filter metallic and non-metallic impurities in the oil throughout the entire oil circulation process. Directly connecting the first end to the relevant oil circuit interface improves the timeliness and effectiveness of oil filtration and reduces the risk of blockage caused by impurities accumulating in the oil circuit. Furthermore, the filter chamber of the filter assembly adopts a tapered structure design, with its flow cross-sectional area gradually decreasing from the open end to the closed end. When the oil passes through the filter mounting base and enters the filter assembly, the flow cross-sectional area of ​​the filter assembly gradually decreases, and the flow space of the oil gradually narrows. This structure can increase the pressure on the oil, appropriately increase the outflow velocity of the oil in the filtration device, increase the flow rate of the oil when passing through the filtration device, avoid oil blockage in the filtration device, and ensure that there is always sufficient oil participating in the oil circuit circulation to improve the oil suction efficiency of the compressor. Attached Figure Description

[0017] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the internal structure of a compressor in the prior art; Figure 2 This is one of the schematic diagrams of the internal structure of the compressor shown in the embodiments of the present invention; Figure 3 This is the second schematic diagram of the internal structure of the compressor shown in the embodiment of the present invention; Figure 4 This is an exploded view of the filtration device shown in an embodiment of the present invention; Figure 5 This is one of the cross-sectional views of the filtering device shown in the embodiment of the present invention; Figure 6 This is a cross-sectional view of the return oil pipeline and the connecting component in the connected state shown in an embodiment of the present invention; Figure 7 This is a second cross-sectional view of the filtering device shown in an embodiment of the present invention; Figure 8 This is one of the schematic diagrams of the filtration device structure shown in the embodiments of the present invention; Figure 9 This is the second schematic diagram of the filter device structure shown in the embodiment of the present invention; Figure 10 This is the third schematic diagram of the filter device structure shown in the embodiment of the present invention.

[0018] In the diagram: 1-Filter screen cover, 101-Filter screen mounting base, 102-Filter screen assembly, 1021-Filter screen surface, 1022-Support component, 103-First end, 104-Second end, 105-Open end, 106-Magnetic ring, 107-Closed end, 108-Internal oil passage, 109-Filter chamber, 2-Compressor, 201-Return oil pipeline, 2011-Oil outlet, 202-Suction oil pipeline, 2021-Oil inlet, 203-Return oil pool, 3-Connecting component, 301-Annular groove, 302-Sealing ring, 4-Oil guide plate, 5-Crankshaft, 6-Upper bracket, 7-Magnet.

[0019] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0020] In the description of this invention, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "contact," and "communication" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In scroll compressor systems, the refrigerant oil carries impurities such as metal powder, welding slag, and sludge during circulation. If these impurities are not effectively filtered, they will directly cause wear on internal moving parts of the compressor (such as the scroll plate, bearings, and shaft seals), and in severe cases, lead to seizure, leakage, or complete machine failure. Figure 1 As shown, currently, magnetic particles are attracted by setting a magnet 7 at the end of the oil suction pipe. However, the magnet 7 removes ferromagnetic impurities by magnetic attraction, which may result in some particles being missed. It is also ineffective for non-magnetic particles (such as copper powder, plastic debris, and oxides).

[0023] Based on this, the following embodiments are proposed.

[0024] Example 1: like Figure 2-4As shown, this embodiment provides a filtration device for filtering impurities in oil when installed in an oil line. The filtration device includes: a filter screen mounting base 101 and a filter screen assembly 102, wherein: The filter mounting base 101 is provided with a first end 103 for connecting to the oil circuit and a second end 104 for detachably connecting to the filter assembly 102. An internal oil passage is formed inside the filter mounting base 101, which passes through the first end and the second end. The filter assembly 102 forms a cover-shaped structure with one end closed and the other end open. The cover-shaped structure encloses a filter chamber. The flow area of ​​the filter chamber gradually decreases from the open end 105 to the closed end 107. The second end 104 is connected to the open end 105. The oil in the oil path enters the internal oil passage of the filter mounting base 101 from the first end 103, then enters the filter chamber of the filter assembly 102 from the second end 104, and finally flows out from the closed end 107.

[0025] In this embodiment, the filter mounting base 101 and the filter assembly 102 are the core structures of the filtration device. The first end 103 of the filter mounting base 101 can be made of metal. The oil circuit is, for example, the oil return line 201 or the oil suction line 202 inside the compressor. The first end 103 can be connected to the oil outlet 2011 of the oil return line 201 and the oil inlet 2021 of the oil suction line 202 of the compressor 2 in various ways. For example, the first end 103 can be connected to both the oil outlet 2011 of the oil return line 201 and the oil inlet 2021 of the oil suction line 202, thereby achieving precise docking between the filtration device and the oil circuit inside the compressor 2, so that the oil must flow through the filtration device during the circulation process to complete the forced filtration of impurities.

[0026] It should be noted that the open end 105 of the cover structure in the filter assembly is detachably connected to the second end 104 in the filter mounting base 101 for oil to flow in the internal oil passage. Since the cover structure has a closed end 107, impurities in the oil will be intercepted inside the cover structure. Thus, the cover structure can completely intercept impurities in the oil that enters the internal oil passage.

[0027] The following explanation uses the filter device used inside the compressor as an example. During the normal operation of the compressor 2, the upper bracket 6 supports the stationary disc inside the compressor 2. When the moving disc reciprocates relative to the stationary disc, it drives the crankshaft 5 to rotate eccentrically through transmission. The refrigerant oil enters the oil suction pipe 202 under the eccentric rotation of the crankshaft 5 and continuously circulates between the oil suction pipe 202 and the oil return pipe 201, providing lubrication and cooling for the moving parts inside the compressor 2. When the oil flows through the pipe interface connected to the first end 103 of the filter device, it will naturally enter the filter device. During the process of the oil passing through the filter device, various impurities such as metal powder, welding slag, sludge, and plastic debris in the oil will be intercepted by the filter screen assembly 102, while the clean oil can smoothly pass through the filter screen assembly 102 and continue to participate in the oil circuit circulation. Connecting the first end 103 of the filter device to the oil outlet 2011 of the oil return line 201 allows for filtration of the oil as soon as it is discharged from the oil return line 201. This effectively intercepts impurities carried out from inside the compressor 2 during the oil return process, preventing these impurities from re-entering the oil circulation and causing secondary wear to the compressor 2 components. This achieves efficient interception of impurities during the oil return process. Connecting the first end 103 to the oil inlet 2021 of the oil suction line 202 allows the oil to be filtered before being sucked into the compressor 2. This achieves efficient interception of impurities during the oil suction process. The cleaner oil effectively protects the core moving components of the compressor 2, such as the scroll plate, bearings, and shaft seals, reducing the probability of component wear.

[0028] When the first end 103 is connected to the oil outlet 2011 of the return oil pipeline 201, the oil is discharged from the return oil pipeline 201 and directly enters the filter device. The filter device can effectively intercept various iron filings and foreign particles and other impurities carried during the oil return process, leaving the impurities in the filter device and preventing them from entering the return oil pool 203. By improving the cleanliness of the oil in the return oil pool 203 of the compressor 2, impurities are prevented from re-entering the compressor 2 through the suction pipeline 202 along with the oil circulation. The suction pipeline 202 only needs to draw oil from the return oil pool 203, and there is no need for secondary filtration at the suction pipeline 202 end. When the first end 103 is connected to the oil inlet 2021 of the oil suction pipe 202, the oil flow effect is not as good as when the first end 103 is connected to the oil outlet of the return oil pipe 201. However, the oil carrying various iron filings and foreign particles will still flow through the filter device before entering the oil suction pipe 202 or before contacting the oil guide plate 4. When the oil flows through the filter device, the filter device will block the impurities at the oil inlet 2021, thereby directly improving the cleanliness of the oil entering the oil suction pipe 202. The return oil pipe 201 only needs to discharge the oil containing impurities directly into the return oil pool 203. Both of these connection methods—connecting the first end 103 to the oil outlet 2011 of the return oil line 201 or connecting the first end 103 to the oil inlet 2021 of the suction oil line 202—can achieve full-process filtration and protection of the compressor 2 oil circuit, ensuring that the oil is always filtered during each cycle of suction and return, thereby improving the cleanliness of the oil.

[0029] A filter assembly can also be installed at the oil outlet 2011 of the oil return line 201 and the oil inlet 2021 of the oil suction line 202, so that the oil outlet 2011 of the oil return line 201 and the oil inlet 2021 of the oil suction line 202 are respectively connected to the first end 103 of a filter device, realizing full-process filtration of the compressor 2 oil circuit, increasing the filtration capacity for impurities, and keeping the oil in a continuous filtration state in both the oil return and oil suction stages, thereby maximizing the cleanliness of the oil and providing more comprehensive protection for the compressor 2.

[0030] By selectively connecting the filter device in the filter assembly and the first end 103 to the oil outlet 2011 of the return oil line 201 or the oil inlet 2021 of the suction oil line 202 of the compressor 2, the oil filtration method of the compressor 2 is diversified. It can continuously and comprehensively filter the metal and non-metal impurities in the oil throughout the entire oil circulation process. By directly connecting the first end 103 of the filter device to the interface of the relevant oil line, the timeliness and effectiveness of oil filtration are improved, the risk of blockage caused by the accumulation of impurities in the oil line is reduced, and the oil suction efficiency of the compressor 2 is guaranteed. The high cleanliness of the oil and the high efficiency of the oil line ensure the stable operation of the compressor 2.

[0031] Preferred, such as Figure 2 and 3As shown, the connection between the first end 103 of the filter device and the oil circuit is designed to be detachable. Specifically, the first end 103 of the filter device can be detachably connected to the oil outlet 2011 of the return oil line 201, or detachably connected to the oil inlet 2021 of the suction oil line 202. Alternatively, with two filter assemblies, the first ends 103 of the two filter devices can be detachably connected to the oil outlet 2011 and the oil outlet 2011 respectively. This detachable connection between the first end 103 of the filter device and the pipeline interface improves the ease of assembly and disassembly of the filter device and the pipeline, reducing the time required for compressor 2 maintenance.

[0032] By setting the first end 103 to the oil outlet 2011 of the return oil pipeline 201 and the oil inlet 2021 of the suction oil pipeline 202 respectively as detachable connections, it is easier to seal and assemble the filter device as a whole with the oil outlet 2011 of the return oil pipeline 201 or the oil inlet 2021 of the suction oil pipeline 202.

[0033] In one embodiment, the first end 103 of the filter device is connected to the oil outlet 2011 and the oil inlet 2021 via a snap-fit ​​connection. An elastic claw is provided on the outside of the first end 103, and corresponding slots are provided on the inside of the oil outlet 2011 of the return oil line 201 and / or the oil inlet 2021 of the suction oil line 202. When the first end 103 is inserted into the corresponding pipe interface, the elastic claw retracts under pressure. After the first end 103 is fully inserted, the elastic claw resets and engages with the slot, thus securing the filter device to the pipe. When disassembly is required, simply press the elastic claw to disengage it from the slot, and the first end 103 can be pulled out of the pipe interface. This snap-fit ​​structure is simple in design, requires no additional connecting accessories, and allows for one-step installation and disassembly. Furthermore, the connection stability after snap-fit ​​is good, effectively preventing the filter device from falling off due to vibration during compressor operation.

[0034] It should be noted that the first end 103 of the filter device can also be designed to be fixedly connected to the oil circuit.

[0035] like Figure 4 , 5 As shown in Figure 7-10, the filtration device is divided into two detachably connected parts: a filter mounting base 101 and a filter assembly 102. A first end 103 is mounted on the filter mounting base 101, while a second end 104 and an open end 105 are respectively provided at the mating ends of the filter mounting base 101 and the filter assembly 102. The detachable connection between these two ends allows for convenient assembly of the entire filtration device. This design creates a modular structure that can be flexibly assembled, meeting diverse filtration performance requirements under different operating conditions.

[0036] During the use of the filtration device, the outer side of the filtration device comes into contact with the oil in the return oil tank 203, and impurities accumulate in the internal chamber of the filtration device due to the continuous flow of oil. Integrated filtration devices are difficult to clean thoroughly after a large accumulation of impurities, often requiring complete replacement, which increases operating costs. In this embodiment, the filtration device consists of a filter mounting base 101 and a filter assembly 102, which are detachably connected via a second end 104 and an open end 105. When deep cleaning is required, the second end 104 and the open end 105 can be disassembled, separating the filter mounting base 101 and the filter assembly 102. This fully exposes the internal chamber of the filtration device, allowing operators to thoroughly clean both the inner and outer sides of the filter mounting base 101 and the filter assembly 102, removing impurities and preventing them from remaining inside the filtration device and reducing oil circulation efficiency and quality. When a part of the filter device is damaged and needs replacement, such as when the filter screen assembly 102 becomes broken due to long-term friction with impurities, only the filter screen assembly 102 needs to be disassembled and replaced individually. This eliminates the need to replace the entire filter device, significantly reducing maintenance and replacement costs. Positioning the first end 103 on the filter screen mounting base 101 ensures the stability of the connection between the filter device and the oil circuit interface, guaranteeing the oil flow sequence. This allows for graded settings of different filtration intensities for multiple filter devices, enabling flexible disassembly of the filter device while ensuring its high-efficiency filtration performance.

[0037] In one embodiment, the filter mounting base 101 and the filter assembly 102 are connected by threads, with the second end 104 having an external thread and the open end 105 having an internal thread, and the specifications of the internal and external threads are matched. The operator screws the open end 105 of the filter assembly 102 onto the second end 104 of the filter mounting base 101, and the connection between the filter mounting base 101 and the filter assembly 102 is completed by the thread engagement. Disassembly is achieved by simply twisting in the opposite direction to separate the filter mounting base 101 and the filter assembly 102.

[0038] By disassembling the filter device into a detachable filter mounting base 101 and a filter assembly 102, and by setting a second end 104 and an open end 105 at the corresponding ends of the two, the filter device as a whole forms a modular combination structure that can be flexibly disassembled. By flexibly disassembling and assembling multiple filter devices, the cleaning and replacement of the filter device by the staff can be more targeted, which can not only greatly reduce the maintenance and replacement cost of the filter device, but also shorten the operation time.

[0039] like Figure 4 , 5As shown in Figures 7-10, the filter assembly 102 adopts a tapered structural design, with its flow cross-sectional area gradually decreasing from the open end 105 to the closed end 107. Preferably, the cover-like structure is a semi-hollow spherical structure or a semi-hollow ellipsoidal structure. It should be noted that "semi" here does not refer to an absolute half, but rather a portion relative to a complete sphere or ellipsoid. This portion is not limited to one-half; it could be one-third or one-quarter, etc. When the oil enters the filter assembly 102 through the filter mounting base 101, the flow cross-sectional area of ​​the filter assembly 102 gradually decreases, and the flow space of the oil gradually narrows. This structure can increase the pressure on the oil, appropriately increase the outflow velocity of the oil in the filter device, increase the flow rate of the oil when passing through the filter device, prevent the oil from clogging in the filter device, and ensure that there is always sufficient oil participating in the oil circuit circulation, thereby improving the oil suction efficiency of the compressor 2.

[0040] Optionally, in one implementation of this embodiment, such as Figure 4 , 5 As shown in Figure 7, the filter assembly 102 includes a multi-layer filter surface 1021, and the mesh size of the multi-layer filter surface 1021 gradually decreases in the direction of oil flow.

[0041] In this embodiment, the surface of the filter mounting base 101 is designed as a closed surface without holes, so that it does not have a filtering function. The filter assembly 102 is designed as a structure of multiple filter screens 1021, and the mesh size of the multiple filter screens 1021 gradually decreases along the oil flow direction, so that the filter assembly 102 forms a multi-level gradient filtration structure.

[0042] After the oil enters the filter mounting base 101 from the first end 103, the oil cannot flow out from the surface of the filter mounting base 101 because the surface of the filter mounting base 101 is a closed surface. After entering the filter mounting base 101, the flow rate of the oil decreases and becomes gentle. At the same time, under the pressure applied by the closed surface of the filter mounting base 101, the oil is continuously pushed towards the filter assembly 102, thereby ensuring that all the oil in the filter mounting base 101 can enter the filter assembly 102 for filtration. This prevents small impurities carried by the oil from leaking out of the filter mounting base 101 and re-entering the oil circuit circulation, ensuring that all oil participating in the circulation can be completely and comprehensively filtered. When the oil enters the filter assembly 102, it flows sequentially through multiple layers of filter screens 1021, with the mesh size gradually decreasing along the oil flow direction. The filter screen 1021 through which the oil first flows has larger mesh sizes, and large-particle impurities such as welding slag and large pieces of sludge are initially intercepted, preventing them from entering the subsequent fine filter screen 1021 and causing clogging, thus protecting the filtration function of the fine filter screen 1021. Subsequently, as the oil flows through the filter screens 1021 with gradually decreasing mesh sizes, medium- and small-particle impurities in the oil, such as metal powder and fine plastic fragments, are intercepted. This achieves graded interception of impurities of different particle sizes by the filtration device, significantly improving the filtration accuracy of the oil to meet the high cleanliness requirements of the compressor 2. The design of the multiple layers of filter screens 1021 also increases the filtration area of ​​the filter assembly 102, allowing the oil to fully contact the filter screens 1021 and improving the filtration effect. The multi-layer filter screen 1021 can also disperse the force on the filter screen 1021, forming a graded buffer for high-flow-rate oil and extending the service life of the filter device.

[0043] In one embodiment, the multi-layer filter screen surface 1021 of the filter screen assembly 102 is designed as an arc-shaped structure that fits into the curved surface of the filter screen assembly 102, and is arranged sequentially along the oil flow direction. Each adjacent filter screen surface 1021 is connected by point-like connectors. Each filter screen surface 1021 is made of a composite of different materials. For example, the first filter screen surface 1021 is a large-mesh metal mesh used to intercept large-particle impurities, the second filter screen surface 1021 is a high-density fiber filter material used to intercept medium-particle impurities, and the third filter screen surface 1021 is a small-mesh metal mesh used to intercept small-particle impurities. The mesh size of each filter screen surface 1021 gradually decreases along the oil flow direction. This curved, fitted structure further increases the contact area between the filter screen 1021 and the oil, thereby improving filtration efficiency. The arc-shaped structure can withstand greater oil impact, preventing deformation of the filter screen 1021. The dotted connectors reduce obstruction to oil flow and ensure oil flow rate.

[0044] By designing the filter mounting base 101 as a closed surface and the filter assembly 102 as a multi-layer filter surface 1021 with progressively smaller mesh sizes, directional flow of oil and graded filtration of impurities are achieved, reducing the risk of oil short-circuiting and reduced oil flow, and ensuring comprehensive oil filtration.

[0045] Optionally, in one implementation of this embodiment, such as Figure 4 , 5 As shown in Figures 7-10, each of the filter screen surfaces 1021 is provided with a support member 1022, which is attached to a portion of the filter screen surface 1021.

[0046] In this embodiment, preferably, the support member 1022 is constructed as a strip structure; multiple support members 1022 are provided, and the multiple support members 1022 are radially attached to the filter screen surface 1021 with any position on the corresponding filter screen surface 1021 as the starting point, and / or, the multiple support members 1022 are attached to the filter screen surface 1021 in a surrounding manner.

[0047] The support member 1022 is attached around each filter screen surface 1021 of the filter screen assembly 102, providing structural support for each filter screen surface 1021 to enhance the structural strength of each filter screen surface 1021 and prevent the filter screen surface 1021 from deforming or collapsing under the action of high pressure oil.

[0048] To achieve high-precision filtration, the multi-layered filter screen 1021 of the filter assembly 102 has small mesh size and relatively thin material. Under the high-pressure conditions of the compressor 2, the impact force of the high-speed oil will exert significant pressure on each filter screen 1021. A strip-shaped support member 1022 is provided around and adheres to each filter screen 1021, providing circumferential and radial support. This effectively disperses the impact force of the high-speed oil on the filter screen 1021, making the stress on the filter screen 1021 more uniform and preventing deformation due to excessive local stress. The support member 1022, which is strip-shaped and small in size, does not significantly obstruct the mesh of the filter screen 1021 and has minimal impact on the effective filtration area of ​​the filter screen 1021. The close fit between the support 1022 and the filter screen 1021 enhances the connection strength between the filter screen 1021 and the support 1022, preventing the support 1022 from falling off the filter screen 1021 under the continuous flushing of oil, and ensuring the structural strength of each layer of filter screen 1021.

[0049] In one embodiment, the support member 1022 is a single-ring strip. An annular strip support member 1022 is provided on each layer of filter screen surface 1021. The support member 1022 is arranged circumferentially around the filter screen surface 1021 and fits against the mid-diameter position of the filter screen surface 1021. The support member 1022 can be made of stainless steel, with a rectangular cross-section, a thickness of 0.5-1 mm, and a width of 2-3 mm. The support member 1022 can be fixedly connected to the surface of the filter screen surface 1021 by welding.

[0050] In another embodiment, the support member 1022 is a multi-ring intersecting strip. Multiple annular strip supports 1022 are arranged radially along the radial direction of the filter screen surface 1021 on each layer of the filter screen surface 1021. Simultaneously, a strip support 1022 is provided along the axial direction of the filter screen surface 1021, intersecting and connecting with the multiple annular supports 1022, thereby forming a radial support structure on the filter screen surface 1021. The support member 1022 can be made of high-strength engineering plastic with a circular cross-section and a diameter of 1-1.5 mm. This support member 1022 can be integrally molded with the filter screen surface 1021 through injection molding, thereby providing omnidirectional support for the filter screen surface 1021 in both circumferential and radial directions, significantly improving the structural strength of the filter screen surface 1021.

[0051] By providing a surrounding and fitted strip support 1022 on each filter screen surface 1021, each filter screen surface 1021 is effectively structurally supported, reducing the risk of deformation and collapse of the multi-layer filter screen surface 1021 when facing the impact of high-pressure oil, so that the filter screen assembly 102 can continuously ensure the filtration accuracy of the oil and provide a reliable filtration effect for the oil circuit of the compressor 2.

[0052] Optionally, in one implementation of this embodiment, such as Figure 4 , 5 As shown in Figures 7-10, at least one of the multi-layer filter screen surfaces 1021 is configured as a magnetic filter screen surface for adsorbing metallic impurities in the oil, and / or a magnetic ring 106 is provided on the inner sidewall of the filter screen mounting base 101 for adsorbing metallic impurities in the oil.

[0053] In this embodiment, at least one of the multi-layer filter surfaces 1021 of the filter assembly 102 is designed to be magnetic, so that the multi-layer filter surfaces 1021 can simultaneously achieve physical filtration and magnetic adsorption functions, so as to perform dual filtration of non-metallic and metallic impurities in the oil. The combination of multiple filtration methods further improves the filtration comprehensiveness and effectiveness of the filter assembly.

[0054] As the oil flows sequentially through the multiple layers of filter screens 1021 within the filter assembly 102, the non-magnetic filter screens 1021 physically intercept non-metallic impurities and some metallic impurities in the oil. Meanwhile, the magnetic filter screens 1021 generate a strong magnetic field, firmly adsorbing any ferromagnetic metal powders or metal fragments that were not physically intercepted onto the filter screens 1021. This precise adsorption of magnetic metallic impurities prevents them from entering the compressor 2 with the oil and causing component wear. Placing the magnetic filter screen 1021 in one layer of the multiple layers complements the other non-magnetic filter screens 1021, combining physical filtration with magnetic adsorption. This effectively intercepts and adsorbs both non-metallic and metallic impurities, regardless of particle size, significantly improving the filtration effect on the oil. Using a magnetic filter surface 1021 eliminates the need for additional magnetic structures in the oil circuit, simplifying the overall structure of the filter assembly and preventing increased oil flow resistance due to excessive additional components, thus ensuring that oil suction efficiency remains unaffected. Furthermore, as part of a multi-layer filter surface 1021, the magnetic filter surface 1021 allows adsorbed metal impurities to be removed along with the other multi-layer filter surfaces 1021 during cleaning, making the process convenient and requiring no additional time or effort from staff.

[0055] In one embodiment, the multi-layer filter surface 1021 is composed of an outer high-density fiber filter material, an inner small-mesh stainless steel mesh, and a middle magnetic filter surface 1021. The magnetic filter surface 1021 is woven from 430 stainless steel with a mesh count of 150 and a thickness of 0.2 mm.

[0056] In another embodiment, two or three layers of the multi-layer filter screen 1021 are all configured as magnetic filter screens 1021. Along the oil flow direction, the magnetic strength of the magnetic filter screen 1021 gradually increases. The magnets 7 within the magnetic filter screen 1021 can be embedded within the support member 1022 on the filter screen 1021, thus not increasing the area obstructed by the mesh openings of the filter screen 1021. This avoids the situation where a single-layer magnetic filter screen 1021 becomes magnetically saturated due to insufficient impurity adsorption capacity. Simultaneously, the filter assembly 102 can maintain a good adsorption effect for a long time, making it suitable for the oil circuit of the compressor 2 with high metal impurity content.

[0057] By setting at least one of the multi-layer filter screens 1021 as a magnetic filter screen, the filter assembly achieves a dual filtration effect of physical filtration and magnetic adsorption, thereby comprehensively removing impurities of various materials from the oil, improving the cleanliness of the oil, providing more comprehensive maintenance for the moving parts in the compressor 2, and retaining the advantage of easy cleaning of the multi-layer filter screen 1021, thus balancing filtration effect and cleaning convenience.

[0058] like Figure 7 As shown, a magnetic ring 106 is provided on the inner wall of the filter mounting base 101. The magnetic ring 106 is used to adsorb metal impurities in the oil of the compressor 2.

[0059] In this embodiment, a magnetic ring 106 structure composed of magnets 7 is added to the inner wall of the filter mounting base 101. Before the oil enters the filter assembly 102, the magnetic field generated by the magnetic ring 106 can pre-adsorb metal impurities in the oil. This forms a combined filtration structure with the multi-layer filter surface 1021 of the filter assembly 102, which consists of magnetic adsorption and multi-stage physical filtration. This allows the oil to complete the initial adsorption of metal impurities before entering the physical filtration stage, thereby improving the filtration performance of the filter assembly.

[0060] After the oil enters the filter mounting base 101 from the first end 103, a stable flow field is formed within the filter mounting base 101. At this time, the magnetic metal impurities in the oil flow slowly and are easily captured. When the oil flows through the magnetic ring 106 on the inner wall of the filter mounting base 101, the magnetic ring 106 generates a strong annular magnetic field that covers the entire flow cross-section of the filter mounting base 101, thereby adsorbing the magnetic metal impurities in the oil onto the magnetic ring 106. This pre-adsorption of magnetic metal impurities significantly reduces the metal impurity content in the oil entering the filter assembly 102, reduces the filtration load of the filter assembly 102, reduces the risk of rapid clogging of the filter assembly 102 due to excessive impurities, and extends the cleaning and replacement cycle of the filter assembly 102. The magnetic ring 106 is located on the inner wall of the filter mounting base 101 and does not obstruct the flow of oil, ensuring the oil circulation flow rate and avoiding the impact on the oil suction efficiency of the compressor 2 due to increased flow resistance. The annular magnetic ring 106 can also achieve 360° magnetic attraction of oil, eliminating dead angles of adsorption, fully adsorbing magnetic metal impurities in oil, and improving the effect of pre-adsorption.

[0061] In one embodiment, the magnetic ring 106 and the filter mounting base 101 are detachably connected. When cleaning the filter assembly, the operator only needs to remove the magnetic ring 106 from the filter mounting base 101, remove the adsorbed metal impurities, and then reinstall it. The operation is convenient and the maintenance efficiency is high.

[0062] In one embodiment, there are multiple magnetic rings 106, each of which is snapped into the inner wall of the filter mounting base 101. An annular mounting groove corresponding to the number of magnetic rings 106 is formed on the inner wall of the filter mounting base 101. The mounting groove is located in the middle and slightly rearward position between the first end 103 and the second end 104. The operator snaps the magnetic rings 106 into the mounting grooves. The inner diameter of the magnetic ring 106 is not less than two-thirds of the diameter of the flow section of the filter mounting base 101, ensuring a sufficiently large oil flow rate. Positioning the magnetic rings 106 in the middle and slightly rearward position allows the oil to have sufficient flow distance within the filter mounting base 101, fully contacting the magnetic field of the magnetic ring 106 to improve the pre-adsorption effect. The snap-fit ​​fixing method makes the installation and removal of the magnetic rings 106 convenient for daily maintenance.

[0063] By setting a magnetic ring 106 on the inner wall of the filter mounting base 101, the magnetic metal impurities in the oil are pre-adsorbed, which complements the multi-stage physical filtration of the filter assembly 102. The magnetic ring 106 not only ensures the comprehensive adsorption of magnetic metal impurities, but also reduces the filtration load of the filter assembly 102, extends the service life of the multi-layer filter surface 1021, and improves the economy of the filter assembly.

[0064] like Figure 4 , 5 As shown in Figures 7-10, optionally, in one implementation of this embodiment, the flow area of ​​the internal oil passage 108 gradually increases from the first end 103 to the second end 104; the internal oil passage 108 and the filter cavity 109 constitute a spherical cavity or an ellipsoidal cavity.

[0065] In this embodiment, when the filter mounting base 101 and the filter assembly 102 are connected together, they form an ellipsoidal structure that is thick in the middle and thin at both ends. This structure has good hydrodynamic characteristics, which can reduce the resistance of oil flowing in the filter device and increase the flow rate of oil through the filter device, thereby improving the filtration efficiency of the oil.

[0066] As the oil enters the filter device from the first end 103, the flow cross-sectional area of ​​the filter screen mounting base 101 gradually increases, and the flow space of the oil gradually widens. This technical feature effectively slows down the flow rate of the oil, allowing it to form a stable flow field within the filter screen mounting base 101. This causes impurities in the oil to settle and be trapped within the filter device, preventing impurities from breaking through the filter screen due to excessively high oil flow rate, thus ensuring the effectiveness of filtration. The reduced oil flow rate also decreases the impact of the oil on the inner wall of the filter device, reducing wear and tear and the frequency of filter replacement. The ellipsoidal filter device combines a gradually expanding structure with a gradually contracting structure, resulting in a smooth curved transition of the overall flow channel within the filter device. This prevents dead zones in the flow of oil within the filter device, avoiding the accumulation of impurities in certain areas and reducing the flow efficiency of the filter device. Simultaneously, the ellipsoidal shape also ensures more uniform stress distribution within the filter device, effectively withstanding the impact of high-pressure oil without deformation, thus guaranteeing the structural strength of the filter device.

[0067] In one embodiment, the filter mounting base 101 can be designed as a convex arc-shaped structure, with its flow cross-sectional area gradually increasing in an arc shape from the first end 103 to the second end 104. The radius of curvature of the arc is 1.5-2 times the total length of the filter device. The filter assembly 102 can be designed as a concave arc-shaped structure, with its flow cross-sectional area gradually decreasing in an arc shape from the opening end 105 to the far end. The radius of curvature of the arc shape matches that of the filter mounting base 101. After the two are connected, they form a streamlined overall structure, thereby further reducing flow resistance and reducing energy loss of oil during flow. This is suitable for the high-flow-rate compressor 2 oil circuit and further improves the filtration efficiency of the filter device and the smoothness of the oil circuit.

[0068] The ellipsoidal filter device, formed by combining the gradually expanding filter mounting base 101 with the gradually contracting filter assembly 102, achieves stable flow and efficient discharge of oil within the filter device. At the same time, the ellipsoidal filter device also reduces the impact and wear of oil on the filter device, and avoids the accumulation and blockage of impurities in dead corners. It not only ensures the filtration effect of impurities, but also provides sufficient clean oil for the oil suction pipe 202, ensuring the smooth circulation of oil.

[0069] Optionally, in one implementation of this embodiment, such as Figure 5-7 As shown, one end of the connecting member 3 is connected at the first end 103; an annular groove 301 is provided on the inner side wall of the other end of the connecting member 3, and a sealing ring 302 is provided in the annular groove 301; the end of the oil passage extends into the connecting member 3, and the outer side wall of the oil passage abuts against the inner side wall of the sealing ring 302; and / or, the other end of the connecting member 3 is screwed to the oil passage.

[0070] In this embodiment, for example, there are two connection methods between the oil return line 201 and the filter assembly that can be used individually or in combination. One method is to achieve a sealed insertion through the interference fit between the connecting piece 3, the annular groove 301 and the sealing ring 302. The other method is to achieve a threaded connection through the fit of internal and external threads. Both connection methods can ensure the connection strength and sealing performance between the filter assembly and the oil return line 201, avoid oil leakage, and also retain the convenience of disassembly and assembly.

[0071] When using the plug-in connection method, the operator first fixes the first end 103 of the filter assembly to one end of the connecting member 3. The inner wall of the other end of the connecting member 3 is provided with an annular groove 301 for installing a sealing ring 302 with elastic deformation capability. This annular groove 301 is an O-ring groove 301. Then, the operator inserts the oil outlet 2011 of the oil return pipe 201 into the connecting member 3, so that the outer wall of the oil return pipe 201 abuts against the inner wall of the sealing ring 302. Since the inner diameter of the sealing ring 302 is slightly smaller than the outer diameter of the oil return pipe 201, the sealing ring 302 will form a seal between the outer wall of the oil return pipe 201 and the inner wall of the connecting member 3 after being squeezed, thereby ensuring the sealing performance of the oil return pipe assembly and preventing the oil pressure and lubrication effect of the compressor 2 from being affected by oil leakage from the connection gap. The connecting piece 3 serves as a transition, allowing for the use of different sized connecting pieces 3 to accommodate filter assemblies and oil return lines 201 of varying specifications. This enhances the versatility of the filter assemblies, enabling filter assemblies of the same specification to fit oil return lines 201 of different diameters. The plug-in connection method also simplifies installation and removal for operators; simply inserting or removing the oil outlet 2011 of the oil return line 201 into the connecting piece 3 allows for the installation and removal of the filter assembly, making it suitable for rapid on-site maintenance of the compressor 2.

[0072] When using a threaded connection, the connecting piece 3 is designed with an internal or external thread structure, and the oil outlet 2011 of the oil return pipeline 201 is correspondingly designed with an external or internal thread structure. The connection between the connecting piece 3 and the oil outlet 2011 is achieved through the engagement of the internal and external threads. The threaded connection offers high structural stability and strong connection strength, effectively withstanding the significant vibrations and high-intensity impacts of the oil during the operation of the compressor 2, preventing the filter assembly from loosening or falling off during oil circulation. Simultaneously, the threaded connection provides good sealing performance, achieving a tight fit between the connection surfaces through the thread engagement to prevent oil leakage, making it suitable for the oil circuit of the compressor 2 under high-pressure conditions.

[0073] When the two connection methods mentioned above are used in combination, the connecting piece 3 is designed with an internal thread structure, and the oil outlet 2011 of the oil return line 201 is designed with an external thread structure. After the connecting piece 3 and the oil outlet 2011 are connected by threads, the outer wall of the oil return line 201 abuts against the inner wall of the sealing ring 302, and the oil outlet 2011 is located below the sealing ring 302. This combined connection method can achieve a dual improvement in sealing performance and connection stability, making the connection between the filter assembly and the oil return line 201 more reliable. It is suitable for the operating conditions of the compressor 2, which has high pressure, high vibration, and extremely high requirements for sealing and stability.

[0074] By detachably connecting the oil return line 201 and the filter assembly together through plug-in, threaded connection, or a combination of both, high sealing performance and high stability of the filter assembly and the oil return line 201 are achieved. This allows the oil return line assembly to adapt to different compressor 2 operating conditions and specifications, improves the versatility of the filter assembly, and ensures that the oil return line assembly maintains convenient maintenance while having reliable filtration function.

[0075] Optionally, in one implementation of this embodiment, such as Figure 4 , 5 As shown in Figures 7-10, the second end 104 is configured as a groove structure, and the open end 105 of the filter assembly 102 is configured as a protrusion structure that can be detachably connected to the groove.

[0076] In this embodiment, when assembling the filter mounting base 101 and the filter assembly 102, the operator aligns the protruding structure of the open end 105 with the groove structure of the second end 104 and inserts the protruding structure into the groove structure. This allows for quick docking of the two connecting ends. The fit between the groove and the protrusion provides precise guidance during the docking process of the two filter devices, preventing path deviation during assembly and ensuring the coaxiality of the filter mounting base 101 and the filter assembly 102. This ensures a smooth and unobstructed flow path for the oil within the filter device, improving oil return efficiency and oil suction efficiency. When the concave and convex structures interlock, the possibility of connection gaps is reduced, effectively lowering the risk of the two filter devices rotating relative to each other and separating due to vibration during compressor 2 operation. This improves connection strength. Furthermore, the groove and protruding structures are relatively simple and easy to manufacture, reducing the production cost of the filter device. Disassembly is also convenient; simply pulling the protruding structure out of the groove structure allows for disassembly, further improving the efficiency of filter device assembly and disassembly.

[0077] In one embodiment, a positioning pin hole is provided on the side wall of the groove structure, and a corresponding elastic positioning pin is provided on the side wall of the protruding structure. When the worker inserts the protruding structure into the groove structure, the elastic positioning pin is squeezed and contracted. When the protruding structure is inserted into place, the elastic positioning pin aligns with the positioning pin hole and pops back to its original position. At this time, the positioning pin is locked into the positioning pin hole, realizing the positioning and fixing of the concave and convex structures. When the worker disassembles, he only needs to press the elastic positioning pin to make it contract and disengage from the positioning pin hole, and the protruding structure can be pulled out from the groove structure.

[0078] By constructing the second end 104 as a groove structure and the open end 105 as a matching protrusion structure, a stable connection between the filter screen mounting base 101 and the filter screen assembly 102 can be ensured, and the relative movement between the two can be limited, avoiding increased flow resistance and oil leakage, and improving the smoothness of oil flow through the filter device.

[0079] Example 2 like Figure 2 and 3 As shown, this embodiment provides a compressor oil return pipe assembly, including an oil return pipe 201 and a filter device as described in Embodiment 1, wherein the first end 103 of the filter device is detachably connected to the oil outlet 2011 of the oil return pipe 201.

[0080] In this embodiment, the compressor oil return pipe assembly integrates the filter assembly from Embodiment 1 with the oil return pipe 201 of the compressor 2. The first end 103 of the filter assembly is detachably connected to the oil outlet 2011 of the oil return pipe 201, so that the oil discharged from the oil return pipe 201 must be filtered by the filter assembly before it can continue to participate in the oil circulation. This forms an integrated oil return filtration structure, ensuring that the oil in the oil return pool 203 of the compressor 2 is fully filtered and highly clean, so that the oil suction pipe 202 can directly draw oil from the oil return pool 203 without further filtration.

[0081] During the operation of compressor 2, the function of the oil return line 201 is to guide the oil that has participated in lubrication and cooling back from inside compressor 2 to the oil circulation system. This oil carries various impurities such as metal powder, wear debris, and sludge generated from the moving parts inside compressor 2. If it flows back directly, these impurities will accumulate in the oil circuit, accelerating the wear of compressor 2 components. By detachably connecting the first end 103 of the filter device in the filter assembly to the oil outlet 2011 of the oil return line 201, the oil discharged from the oil return line 201 will immediately enter the filter assembly for filtration, intercepting and removing impurities in the returned oil as quickly as possible. This prevents impurities from re-entering compressor 2 with the oil, effectively protecting the core moving parts of compressor 2. The detachable connection between the filter assembly and the oil return line 201 realizes the modular design of the oil return line assembly, allowing the filter assembly to be produced, installed, and maintained as an independent module. This significantly improves the assembly and maintenance efficiency of compressor 2's oil circuit and enhances the adaptability of the filter assembly. When the filter assembly needs cleaning or replacement, the operator only needs to remove it from the oil outlet 2011 of the oil return line 201, without having to disassemble the entire oil return line 201. By placing the filter assembly directly at the oil outlet 2011 of the oil return line 201, the oil flow path is shortened, thereby reducing oil flow resistance and ensuring the oil return efficiency and oil suction efficiency of the compressor 2.

[0082] By integrating the filter assembly in Embodiment 1 with the oil return line 201, and making the first end 103 of the filter assembly detachably connected to the oil outlet 2011 of the oil return line 201, integrated filtration and modular structure of the oil return process of the compressor 2 are realized. This reduces the risk of impurities breaking through the filter components and flowing back, thus increasing component wear. It not only improves the filtration efficiency of the oil, but also improves the assembly and maintenance efficiency of the filter assembly, enabling the compressor 2 to maintain a stable and efficient oil circuit circulation.

[0083] Example 3 like Figure 2 and 3 As shown, this embodiment provides a compressor 2. The compressor 2 in this embodiment includes the filter device in embodiment one or the oil return pipe assembly in embodiment two, wherein at least a portion of the filter device is located in the oil return sump 203 at the bottom of the compressor 2.

[0084] Since the compressor 2 in this embodiment includes the filter assembly in embodiment one or the oil return pipe assembly in embodiment two, the compressor 2 has all the beneficial effects of the filter assembly in embodiment one or the oil return pipe assembly in embodiment two, which will not be elaborated here.

[0085] In addition, at least part of the filter device is located in the oil return pool 203 at the bottom of the compressor 2, which can prevent oil splashing during the oil return process, and if the filter device has a magnetic component, it can further adsorb smaller metal impurities in the oil return pool.

[0086] This compressor is an energy-saving compressor that can be used in energy-saving air conditioners. Through the efficient filtration of the oil inside the compressor by the filtration device, the compressor can operate efficiently and stably. When used in air conditioners, this compressor achieves energy-saving effects.

[0087] In summary, the ingenious design of this filtration device lies in: First, the filtration device is designed to consist of a filter mounting base and a filter assembly. The first end of the filter mounting base is connected to the oil circuit. The filter assembly can continuously and comprehensively filter metallic and non-metallic impurities in the oil throughout the entire oil circulation process. Directly connecting the first end to the interface of the relevant oil circuit improves the timeliness and effectiveness of oil filtration and reduces the risk of blockage caused by impurities accumulating in the oil circuit. Furthermore, the filter chamber of the filter assembly adopts a tapered structure design, with its flow cross-sectional area gradually decreasing from the open end to the closed end. When the oil passes through the filter mounting base and enters the filter assembly, the flow cross-sectional area of ​​the filter assembly gradually decreases, and the flow space of the oil gradually narrows. This structure can increase the pressure on the oil, appropriately increase the outflow velocity of the oil in the filtration device, increase the flow rate of the oil when passing through the filtration device, avoid oil blockage in the filtration device, and ensure that there is always sufficient oil participating in the oil circuit circulation to improve the oil suction efficiency of the compressor.

[0088] Secondly, the filter assembly is designed as a multi-layered filter surface with progressively smaller mesh size, which enables directional flow of oil and graded filtration of impurities, reduces the risk of oil short-circuiting and reduced oil flow, and ensures comprehensive oil filtration.

[0089] Third, by setting fitted strip-shaped support members on each layer of filter screen, each layer of filter screen is effectively supported by structure, reducing the risk of deformation and collapse of the multi-layer filter screen when facing the impact of high-pressure oil. This allows the filter screen assembly to continuously ensure the filtration accuracy of the oil and provide a reliable filtration effect for the compressor oil circuit.

[0090] Fourth, by setting at least one layer of the multi-layer filter screen as a magnetic filter screen, the filter assembly achieves a dual filtration effect of physical filtration and magnetic adsorption, thereby comprehensively removing impurities of various materials from the oil, improving the cleanliness of the oil, providing more comprehensive maintenance for the moving parts inside the compressor, and retaining the advantage of easy cleaning of the multi-layer filter screen. It balances filtration effect and cleaning convenience, and / or by setting a magnetic ring on the inner side wall of the filter mounting base to achieve pre-adsorption of magnetic metal impurities in the oil, which complements the multi-stage physical filtration of the filter assembly. The magnetic ring not only ensures the comprehensive adsorption of magnetic metal impurities, but also reduces the filtration load of the filter assembly, extends the service life of the multi-layer filter screen, and improves the economy of the filter assembly.

[0091] It can be further understood that in this disclosure, "many" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0092] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0093] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0094] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims of this application.

[0095] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A filter device for filtering impurities in oil provided on an oil passage, characterized by: The filtration device includes: a filter mounting base (101) and a filter assembly (102), wherein: The filter mounting base (101) is provided with a first end (103) for connecting to the oil circuit and a second end (104) for connecting to the filter assembly (102). An internal oil passage (108) is formed inside the filter mounting base (101) that passes through the first end (103) and the second end (104). The filter assembly (102) forms a cover-shaped structure with one end closed and the other end open. The cover-shaped structure surrounds a filter chamber (109). The flow area of ​​the filter chamber (109) gradually decreases from the open end (105) to the closed end (107). The second end (104) is connected to the open end (105). The oil in the oil path enters the internal oil passage (108) of the filter mounting base (101) from the first end (103), then enters the filter chamber (109) of the filter assembly (102) from the second end (104) of the filter mounting base (101), and finally flows out from the closed end (107).

2. The filtration device according to claim 1, characterized in that, The cover-like structure is a semi-hollow spherical structure or a semi-hollow ellipsoidal structure.

3. The filtration device according to claim 1, characterized in that, The filter assembly (102) includes a multi-layer filter surface (1021), and the mesh size on the multi-layer filter surface (1021) gradually decreases along the direction of oil flow.

4. The filter device of claim 3, wherein, Each of the filter screen surfaces (1021) is provided with a support member (1022), and the support member (1022) is attached to a portion of the filter screen surface (1021).

5. The filtration device according to claim 4, characterized in that, The support member (1022) is constructed as a strip structure; Multiple support members (1022) are provided. The multiple support members (1022) are radially attached to the filter screen surface (1021) with any position on the corresponding filter screen surface (1021) as the starting point, and / or the multiple support members (1022) are attached to the filter screen surface (1021) around it.

6. The filtration device according to claim 3, characterized in that, At least one of the multi-layer filter screens (1021) is configured as a magnetic filter screen for adsorbing metal impurities in the oil, and / or a magnetic ring (106) is provided on the inner wall of the filter screen mounting base (101) for adsorbing metal impurities in the oil.

7. The filtration device according to claim 1, characterized in that, The flow area of ​​the internal oil passage (108) gradually increases from the first end (103) to the second end (104); The internal oil passage (108) and the filter cavity (109) form a spherical cavity or an ellipsoidal cavity.

8. The filtration device according to claim 1, characterized in that, The first end (103) is detachably connected to the oil circuit, and the second end (104) is detachably connected to the open end (105).

9. The filtration device according to claim 8, characterized in that, The second end (104) is configured as a groove structure, and the open end (105) of the filter assembly (102) is configured as a protrusion structure that can be detachably connected to the groove.

10. The filtration device according to claim 1, characterized in that, One end of the connecting member (3) is connected at the first end (103); An annular groove (301) is provided on the inner sidewall of the other end of the connecting member (3), and a sealing ring (302) is provided in the annular groove (301). The end of the oil passage extends into the connecting member (3), and the outer sidewall of the oil passage abuts against the inner sidewall of the sealing ring (302); and / or, the other end of the connecting member (3) is screwed to the oil passage.

11. A compressor oil return tube assembly characterized by, include: Return oil line (201) ； The filtration device as described in any one of claims 1-10; The first end (103) of the filter device is detachably connected to the oil outlet (2011) of the return oil pipeline (201).

12. A compressor, characterized in that, include: The filtration device as described in any one of claims 1-10; Or, the return pipe assembly as described in claim 11; At least part of the filter is located in the oil return sump (203) at the bottom of the compressor (2).

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