Filter with oil drainage function

Abstract

The filter with the oil drainage function comprises a supporting framework, a filtering medium and a base, the supporting framework is fixed to the base, the filtering medium is fixed in the circumferential direction of the supporting framework, a filtering cavity with an upward opening is formed by the filtering medium and the supporting framework, and oil liquid penetrates through the filtering medium to enter the filtering cavity. The opening end of the filtering cavity is used for being connected with an oil suction channel of an oil pump, and external threads are arranged in the circumferential direction of the base and used for being matched with internal threads of an oil drainage opening in the bottom of an electric drive shell. According to the filter, multiple functions of an anchoring structure, an oil drainage structure, an oil filtering structure and the like are integrated through the arrangement of the base and the external threads, the filter is anchored to the lowest position of an oil area of an electric drive assembly through the base and the external threads, and therefore it can be guaranteed that the filter has the good oil absorption effect when the electric drive assembly is in various states; and meanwhile, the filter is convenient to screw and disassemble through external threads, and can be used as an oil drainage bolt for emptying oil during later-stage oil change maintenance of the electric drive assembly, so that residual oil in the box body is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-cooled electric drive, in particular to an oil filter structure, and specifically relates to a filter with an oil draining function. Background Art

[0002] At present, most of the drive devices of new energy vehicles adopt electric drive assemblies as the drive devices of the vehicles. Oil-cooled electric drives have been widely used in the field of electric drive due to their advantages such as high power density, high integration, light weight, and high performance. In an oil-cooled electric drive system, the core cooling components mainly include oil pumps, filters, oil coolers, oil pipes, etc. Among them, the oil pump serves as the power source for the lubricating oil to flow, mainly playing the role of sucking and discharging oil in the system; the filter is mainly used to filter impurities in the oil fluid, thereby protecting precision transmission parts such as oil pumps, bearings, and gears; the oil cooler, as a heat exchange device between the lubricating oil and the coolant, is mainly used to reduce the temperature of the lubricating oil, so that the cooled lubricating oil can cool parts such as motors; the oil pipe parts mainly play the role of transmitting and guiding the flow direction of the oil fluid in the oil-cooled electric drive system. The filter is installed at the front end of the oil pump. By filtering impurities in the oil fluid through the filter, problems such as pump jamming and abnormal wear of the oil pump caused by metal and non-metal impurities entering the oil pump can be avoided. In order to fully mobilize the oil fluid in the electric drive housing, the inlet of the oil pump suction channel needs to be installed at the lowest point of the electric drive housing, and the filter is usually installed at the front end of the inlet of the suction channel, which is not convenient for cleaning or replacement, and the filter needs to be cleaned, maintained, or replaced regularly. In addition, when the installation position of the oil pump is relatively high, there will be a certain vertical height difference between the filter and the oil inlet of the oil pump. After the oil pump is turned off, the oil fluid in the suction channel will flow back to the bottom of the electric drive housing under the action of gravity. When the oil pump is started again, the pump head will experience a short-term suction void and dry running without oil. Frequent occurrence of this working condition is likely to cause problems such as wear of the pump head gears, gear meshing noise, damage to oil pump components, and sealing failure. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a filter with an oil draining function that has a simple structure and is convenient to use in view of the deficiencies of the prior art.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0005] A filter with an oil draining function includes a support skeleton, a filter medium, and a base. The support skeleton is fixed on the base. The filter medium is fixed along the circumference of the support skeleton and forms a filter cavity with an upward opening with the support skeleton. The oil fluid passes through the filter medium and enters the filter cavity. The open end of the filter cavity is used to connect with the suction channel of the oil pump. The circumference of the base is provided with an external thread, and the external thread is used to cooperate with the internal thread of the oil draining port at the bottom of the electric drive housing.

[0006] For the above-mentioned filter with an oil draining function, in a further improvement, it further includes a check valve, and the check valve is located at the open end of the filtering chamber.

[0007] For the above-mentioned filter with an oil draining function, in a further improvement, the check valve is a ball check valve, a butterfly check valve or a lift check valve.

[0008] For the above-mentioned filter with an oil draining function, in a further improvement, the check valve is a butterfly check valve, and the butterfly check valve includes a valve plate and a connecting rod. A hinge seat is provided at the open end of the filtering chamber. One end of the connecting rod is fixed on the valve plate, and the other end is hinged on the hinge seat.

[0009] For the above-mentioned filter with an oil draining function, in a further improvement, a clamping joint is provided at the bottom of the filtering chamber, and a clamping seat is provided at the top of the base. The clamping joint and the clamping seat are nested and matched.

[0010] For the above-mentioned filter with an oil draining function, in a further improvement, the filtering medium is a metal mesh or a fiber filter paper.

[0011] For the above-mentioned filter with an oil draining function, in a further improvement, the support skeleton is a metal support skeleton or a plastic support skeleton.

[0012] For the above-mentioned filter with an oil draining function, in a further improvement, an internal hexagonal groove is provided on the bottom surface of the base.

[0013] For the above-mentioned filter with an oil draining function, in a further improvement, a first sealing ring is provided at the connection between the filtering chamber and the oil suction passage.

[0014] For the above-mentioned filter with an oil draining function, in a further improvement, a second sealing ring is provided below the external thread of the base to form a seal with the oil draining port at the bottom of the electric drive housing.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] (1) The present utility model makes full use of the commonalities that both the filter and the oil draining bolt need to be fixed at the lowest point of the oil area of the electric drive assembly and need to be regularly replaced and maintained, and designs a filter with an oil draining function. By providing a base and an external thread at the bottom of the filter, the filter integrates multiple functions such as an anchoring structure, an oil draining structure and an oil filtering structure. Specifically, the base and the external thread can be used as the anchoring structure of the filter to anchor the filter at the lowest point of the oil area of the electric drive assembly, which can not only ensure that the filter has a good oil suction effect under various states of the electric drive assembly, but also the filter can be easily disassembled and replaced by screwing on and off the external thread. Moreover, it can also be used as an oil draining bolt during the later oil change and maintenance of the electric drive assembly to drain the oil, reducing the residual oil in the box. This filter is ingeniously designed, simple in structure, convenient to use, diverse in functions, and easy to promote and apply.

[0017] (2) The filter of the present utility model with an oil discharge function also has a check valve provided at the opening end of the filter cavity. Based on the functions of filtering, anchoring, and oil discharge, the function of check is integrated, enabling the filter to effectively avoid the pump from sucking air, avoiding difficult oil suction in the extreme working conditions of the pump, and meeting the layout requirements of more pumps in the electric drive assembly, especially for the situation where there is a large vertical height difference between the pump and the filter or between the pump and the oil suction port at the bottom of the electric drive housing. Among them, the filter can filter impurities in the lubricating oil, effectively preventing impurities from entering the pump and causing abnormal wear of the pump; the check valve can prevent the oil from returning to the electric drive housing when the pump stops working, enabling the lubrication system to be started in a timely manner when the pump is restarted, solving the problem in the prior art that when the pump stops working, the oil stored in the oil passage between the pump and the filter flows back to the bottom of the electric drive housing, and there is a period of dry running without oil when the pump is restarted, causing damage to components; the base and the external thread can be used for anchoring the filter and disassembling the oil discharge when replacing the lubricating oil of the electric drive assembly. The present utility model realizes the integration of the filter, the check valve, and the oil drain bolt, reducing the number of parts of the electric drive assembly and improving the utilization rate of parts. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the application scenario of the filter with an oil discharge function in a specific embodiment of the present utility model.

[0019] Figure 2 It is a schematic structural diagram of the filter with an oil discharge function in a specific embodiment of the present utility model.

[0020] Figure 3 It is the front view and cross-sectional view of the closed state of the filter check valve in a specific embodiment of the present utility model.

[0021] Figure 4 It is the front view and cross-sectional view of the open state of the filter check valve in a specific embodiment of the present utility model.

[0022] Legend: 1, support skeleton; 2, filter medium; 3, base; 31, external thread; 32, internal hexagonal groove; 33, clamping seat; 4, filter cavity; 41, clamping head; 5, oil pump; 51, oil suction passage; 6, bottom of the electric drive housing; 61, oil discharge port; 7, check valve; 71, valve plate; 72, connecting rod; 73, hinge seat; 8, first sealing ring; 9, second sealing ring. Detailed Embodiments

[0023] The following further describes the present utility model in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but does not limit the protection scope of the present utility model thereby.

[0024] Figure 1 and Figure 2As shown in the figure, the filter of this embodiment with an oil draining function includes a support skeleton 1, a filter medium 2, and a base 3. The support skeleton 1 is fixed on the base 3. The filter medium 2 is fixed along the circumference of the support skeleton 1 and forms a filter cavity 4 with an upward opening together with the support skeleton 1. The oil fluid passes through the filter medium 2 and enters the filter cavity 4. The opening end of the filter cavity 4 is used to connect with the oil suction passage 51 of the oil pump 5. The circumference of the base 3 is provided with an external thread 31, and this external thread 31 is used to cooperate with the internal thread of the oil draining port 61 at the bottom of the electric drive housing 6.

[0025] Through the setting of the base 3 and the external thread 31, the filter of this embodiment integrates multiple functions such as an anchoring structure, an oil draining structure, and an oil fluid filtering structure. The filter is anchored at the lowest point of the oil fluid area of the electric drive assembly through the base 3 and the thread, which can not only ensure that the filter has a good oil suction effect in various states of the electric drive assembly, but also the filter can be screwed on and disassembled through the external thread 31, which is convenient for disassembly and replacement. Moreover, it can also be used as an oil draining bolt to drain the oil fluid during the later oil change and maintenance of the electric drive assembly, reducing the existence of residual oil in the box body.

[0026] Further improved, in this embodiment, a check valve 7 is also included. The check valve 7 is located at the opening end of the filter cavity 4. When the oil pump 5 stops working, as Figure 3 shown, the valve port closes and the oil fluid cannot return to the oil fluid area at the bottom of the electric drive housing 6 from between the oil pump 5 and the filter. When the oil pump 5 restarts, the valve port of the check valve 7 opens. Thus, it can effectively prevent the oil fluid stored in the oil suction passage 51 from flowing back to the bottom of the electric drive housing 6 under the action of gravity when the oil pump 5 stops working. When the oil pump 5 starts again, there is no need to suck the oil fluid into the oil passage again, avoiding the dry grinding state of the oil pump 5 for a period of time during restart. This embodiment is especially applicable to the application scenario where there is a certain height difference between the position of the oil pump 5 and the filter due to the structural layout reason, and there is a long vertical oil passage between the oil suction port of the oil pump 5 and the inlet of the oil suction passage 51. Both electronic oil pumps and mechanical pumps are applicable.

[0027] Further improved, in this embodiment, the check valve 7 is a butterfly check valve. As Figure 4 shown, the butterfly check valve includes a valve plate 71 and a connecting rod 72. The opening end of the filter cavity 4 is provided with a hinge seat 73. One end of the connecting rod 72 is fixed on the valve plate 71, and the other end is hinged on the hinge seat 73. The check valve 7 is connected to the filter body, that is, the filter cavity 4, through a hinge structure and can freely rotate around the hinge point, automatically opening and closing following the start and stop of the oil pump 5.

[0028] Of course, in other embodiments, the check valve 7 can also adopt a ball check valve or a lift check valve.

[0029] Further improved, in this embodiment, a clamping joint 41 is provided at the bottom of the filter chamber 4, and a clamping seat 33 is provided at the top of the base 3. The clamping joint 41 and the clamping seat 33 are nested and matched. The filter chamber 4 is installed on the base 3 through the nested cooperation of the clamping joint 41 and the clamping seat 33, which is convenient for the assembly and disassembly of the two, and is convenient for partial replacement and maintenance. That is, only the filter chamber 4 needs to be replaced when the filter chamber 4 is damaged, and only the base 3 needs to be replaced when the base 3 is damaged, reducing the maintenance cost.

[0030] Further improved, in this embodiment, the support skeleton 1 is a metal support skeleton 1, and the filter medium 2 is a dense metal mesh. The support skeleton 1 and the filter medium 2 made of metal materials have good reliability.

[0031] Further improved, in this embodiment, an internal hexagonal groove 32 is provided on the bottom surface of the base 3, and an external wrench can be used to cooperate with the internal hexagonal groove 32 to disassemble and replace the filter, which is convenient for disassembly and assembly.

[0032] Further improved, in this embodiment, a first sealing ring 8 is provided at the connection between the filter chamber 4 and the oil suction passage 51, thereby better preventing the unfiltered oil from entering the oil suction passage 51.

[0033] Further improved, in this embodiment, a second sealing ring 9 is provided below the external thread 31 of the base 3 for forming a seal with the oil drain port 61 at the bottom of the electric drive housing 6 to better prevent the oil from leaking to the outside of the electric drive housing.

[0034] Although the present utility model is disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A filter with oil drain function, characterized in that: The invention comprises a support frame (1), a filter medium (2) and a base (3), wherein the support frame (1) is fixed on the base (3), the filter medium (2) is fixed along the circumference of the support frame (1), and forms a filter cavity (4) with an opening facing upward together with the support frame (1), oil passes through the filter medium (2) into the filter cavity (4), the open end of the filter cavity (4) is used to be connected to the oil suction passage (51) of the oil pump (5), and the base (3) is provided with an external thread (31) in the circumference, and the external thread (31) is used to cooperate with the internal thread of the oil drain port (61) at the bottom (6) of the electric drive housing.

2. The filter with oil drain function according to claim 1, characterized in that: It also comprises a check valve (7), wherein the check valve (7) is located at the opening end of the filter chamber (4).

3. The filter with oil drain function according to claim 2, characterized in that: The check valve (7) is a spherical check valve, a butterfly check valve or a lifting check valve.

4. The filter with oil drain function according to claim 3, characterized in that: The check valve (7) is a butterfly check valve, comprising a valve plate (71) and a connecting rod (72); an opening end of the filter chamber (4) is provided with a hinge seat (73); one end of the connecting rod (72) is fixed on the valve plate (71), and the other end is hinged on the hinge seat (73).

5. The filter with oil drain function according to claim 1, characterized in that: A card joint (41) is provided at the bottom of the filter cavity (4), a card seat (33) is provided at the top of the base (3), and the card joint (41) is nested with the card seat (33).

6. The filter with oil drain function according to claim 1, characterized in that: The filter medium (2) is a metal mesh or fiber filter paper.

7. The filter with oil drain function according to claim 1, characterized in that: The support frame (1) is a metal support frame or a plastic support frame.

8. The filter with oil drain function according to claim 1, characterized in that: The bottom surface of the base (3) is provided with a hexagonal groove (32).

9. The filter with oil drain function according to any one of claims 1 to 8, characterized in that: A first sealing ring (8) is provided at the connection between the filter chamber (4) and the oil suction channel (51).

10. The filter with oil drain function according to claim 9, characterized in that: A second sealing ring (9) is provided below the external thread (31) of the base (3) for forming a seal with the oil drain port (61) at the bottom (6) of the electric drive housing.

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