Oil mist filter

Abstract

The oil mist filter comprises a shell, a filter element and a waterproof breathable film, the shell is provided with an air inlet cavity, a filter cavity and an exhaust cavity which are sequentially communicated, the inner wall of the filter cavity is provided with a plurality of flow dividing grooves extending from the air inlet cavity to the exhaust cavity, the flow dividing grooves are communicated with the air inlet cavity, and the filter element is installed in the filter cavity. The outer wall of the filter element abuts against the inner wall of the filter cavity and covers the diversion groove, and the waterproof breathable film seals the end, facing the exhaust cavity, of the filter cavity. According to the oil mist filter disclosed by the utility model, the volatilization path of oil mist is increased by forming the plurality of flow dividing grooves communicated with the air inlet cavity in the inner wall of the filter cavity, so that on one hand, the risk that the bottom of the filter element is submerged can be reduced, the ventilation function of the oil mist filter is guaranteed, and on the other hand, the oil mist can be fully absorbed and cooled, and the filter effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field, especially relate to an oil mist filter. BACKGROUND

[0002] The power and transmission system in the automobile manufacturing industry, such as driving motor, speed reducer, gearbox, hybrid unit, range extender, etc., in the working process, three significant problems caused by the high-speed rotation of the gear, namely, the splash of lubricating oil, high temperature, liquid oil atomization (oil mist).

[0003] The current widely used solution on the market is to add a breather valve on the power transmission system, in addition to setting a conventional waterproof breather membrane, a filter element is also set to filter the backflow oil mist, such as the utility model patent with the announcement number CN220268382U, however, the filter element bottom of this type of breather valve has the risk of being "submerged" for a long time, which will cause the gas to be unable to pass through, thereby affecting the air permeability function of the breather valve. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an oil mist filter to solve the problem of air permeability affected by the filter element bottom being submerged.

[0005] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is as follows:

[0006] An oil mist filter comprises a shell, a filter element and a waterproof air permeable membrane, the shell has an air inlet cavity, a filter cavity and an air outlet cavity which are sequentially communicated, the inner wall of the filter cavity is provided with a plurality of shunt grooves extending from the air inlet cavity to the air outlet cavity direction, the shunt grooves are communicated with the air inlet cavity, the filter element is installed in the filter cavity, the outer wall of the filter element is in contact with the inner wall of the filter cavity and covers the shunt grooves, and the waterproof air permeable membrane seals one end of the filter cavity facing the air outlet cavity.

[0007] Preferably, the shunt grooves are configured to extend spirally from the air inlet cavity to the air outlet cavity direction.

[0008] Preferably, the plurality of shunt grooves are distributed along the circumferential direction of the filter cavity.

[0009] Preferably, a limiting step is provided at one end of the filter cavity facing the air outlet cavity, and a hollow gland is installed in the limiting step to press the filter element in the filter cavity.

[0010] Preferably, the hollow gland comprises a limiting part matched with the limiting step and a pressing ring part connected to one end of the filter element facing the limiting part, a plurality of air permeable holes are provided in the limiting part on the inner side of the pressing ring part and communicated with the filter cavity and the air outlet cavity, the pressing ring part is in contact with the filter element, and the outer wall of the limiting part and / or the outer wall of the pressing ring is in contact with the inner wall of the filter cavity.

[0011] Preferably, the air inlet cavity is arranged to expand towards the filter cavity at one end close to the filter cavity.

[0012] Preferably, the air inlet cavity is connected with a plurality of baffles arranged along the length direction at one end away from the filter cavity, and the adjacent baffles are arranged staggered.

[0013] Preferably, the air inlet cavity is extended into the air inlet cavity, or the air inlet cavity is provided with a support frame.

[0014] Preferably, the air outlet cavity is provided with a mounting port at one end away from the filter cavity, the mounting port is detachably connected with an end cover, and the side wall of the air outlet cavity is provided with a plurality of air outlet ports arranged in a circumferential direction.

[0015] Preferably, the filter core comprises an oil absorption layer and an oil-repellent filter layer arranged in sequence from the air inlet cavity to the air outlet cavity.

[0016] Preferably, the filter core further comprises a suspended support arranged between the oil absorption layer and the oil-repellent filter layer.

[0017] Preferably, the oil absorption layer comprises at least one of cellulose filter material, synthetic fiber filter material and glass fiber filter material.

[0018] Preferably, the oil-repellent filter layer comprises at least one of oil-repellent modified glass fiber filter material, oil-repellent modified cellulose filter material and oil-repellent modified synthetic fiber filter material.

[0019] By adopting the above technical scheme, the oil mist filter has the following beneficial effects: the oil mist filter of the utility model is provided with a plurality of shunt grooves communicated with the air inlet cavity in the inner wall of the filter cavity to increase the volatilization path of the oil mist, which can reduce the risk of the filter core bottom being submerged, guarantee the air permeability of the oil mist filter, and fully absorb and cool the oil mist to improve the filtering effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an explosion structure schematic view of the oil mist filter of the preferred embodiment of the utility model.

[0021] Figure 2 It is an explosion structure schematic view of the oil mist filter of the preferred embodiment of the utility model. Figure 1 It is an isometric cross-sectional view of the middle shell.

[0022] Figure 3 It is an isometric cross-sectional view of the middle shell. Figure 4 It is an isometric cross-sectional view of the middle shell. Figure 1 It is an isometric cross-sectional view of the middle shell.

[0023] Wherein: 1, the shell; 11, the air inlet chamber; 12, the filter chamber; 121, the flow dividing groove; 122, the limiting step; 13, the air outlet chamber; 131, the air outlet; 14, the hollow gland; 141, the limiting part; 142, the compression ring part; 143, the air hole; 15, the end cover; 16, the baffle; 2, the filter element; 21, the oil absorption layer; 22, the oil filtering layer; 3, the waterproof air permeable membrane. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings and specific embodiments.

[0025] As Figures 1-4 shown, the oil mist filter of the embodiment includes a shell 1, a filter element 2 and a waterproof air permeable membrane 3. The shell 1 has an air inlet chamber 11, a filter chamber 12 and an air outlet chamber 13 in sequence. The inner wall of the filter chamber 12 is provided with a plurality of flow dividing grooves 121 extending from the air inlet chamber 11 to the air outlet chamber 13. The flow dividing grooves 121 are in communication with the air inlet chamber 11. The filter element 2 is installed in the filter chamber 12. The outer wall of the filter element 2 is in contact with the inner wall of the filter chamber 12 and covers the flow dividing grooves 121. The waterproof air permeable membrane 3 is sealed at one end of the filter chamber 12 facing the air outlet chamber 13.

[0026] The flow dividing grooves 121 of the embodiment make the oil mist entering the filter chamber 12 from the air inlet chamber 11 have two flow directions: one is entering the filter element 2 from the side end face of the filter element 2 facing the air inlet chamber 11, and the other is flowing into the flow dividing grooves 121 and entering the filter element 2 from the side wall of the filter element 2. The flow dividing grooves 121 increase the volatilization path of the oil mist. On the one hand, it can reduce the risk of the bottom of the filter element 2 being "flooded", guaranteeing the air permeability of the oil mist filter. On the other hand, it makes the oil mist be fully absorbed and cooled, improving the filtering effect. The liquefied oil mist can also flow down along the flow dividing grooves 121 to the air inlet chamber 11, thereby flowing back to the power transmission system, preventing the liquid level from falling.

[0027] In a feasible option of the embodiment, the flow dividing grooves 121 are configured to extend spirally from the air inlet chamber 11 to the air outlet chamber 13. Preferably, the flow dividing grooves 121 extend spirally at least one turn. Compared with the flow dividing grooves 121 extending linearly, the tortuous structure of the flow dividing grooves 121 extending spirally can increase the travel of the oil mist and increase the resistance of the oil mist advancing, which is beneficial to fully absorbing and cooling the oil mist on the one hand and to miniaturizing the oil mist filter on the other hand.

[0028] In order to improve the uniformity of the filter element 2 in absorbing the oil mist, the flow dividing grooves 121 are arranged in a circumferential array along the filter chamber 12.

[0029] The filtering cavity 12 of the present embodiment is provided with a limiting step 122 at one end facing the exhaust cavity 13, and a hollow gland 14 is installed in the limiting step 122 to press fit the filter element 2 in the filtering cavity 12. The hollow gland 14 is used to limit the filter element 2 in the filtering cavity 12, and also to isolate the filter element 2 from the waterproof air-permeable membrane 3 to prevent the waterproof air-permeable membrane 3 from being contaminated and disabled.

[0030] In one alternative of the present embodiment, the hollow gland 14 includes a limiting portion 141 matched with the limiting step 122, and a pressing ring portion 142 connected to the limiting portion 141 and facing one end of the filter element 2, and a plurality of air-permeable holes 143 are provided in the limiting portion 141 and connected with the filtering cavity 12 and the exhaust cavity 13. In order to avoid the existence of gaps between the one end of the filter element 2 facing the exhaust cavity 13 and the hollow gland 14, and between the hollow gland 14 and the exhaust cavity 13, so that the oil mist escapes from the gaps, the pressing ring portion 142 needs to be in contact with the filter element 2, and at least one of the outer walls of the limiting portion 141 and the pressing ring portion 142 needs to be in contact with the inner wall of the filtering cavity 12. The hollow gland 14 can block the end of the shunt groove 121, and even if a small amount of oil mist reaches the end of the shunt groove 121, it will be blocked by the hollow gland 14, so that this part of the oil mist is absorbed and liquefied by the filter element 2. The hollow gland 14 is preferably made of elastic material to achieve sealing and fixing effects through its own elasticity.

[0031] The filter element 2 of the present embodiment includes an oil absorption layer 21 and an oil-repellent filter layer 22 stacked in sequence from the air inlet cavity 11 to the exhaust cavity 13. The oil absorption layer 21 can fully absorb most of the oil mist, liquefy the oil mist, and make the liquefied oil mist flow back to the power transmission system from the air inlet cavity 11 to prevent the oil level from dropping. The oil-repellent filter layer 22 captures the final part of the oil mist, which can prevent the oil mist from contaminating the waterproof air-permeable membrane 3 and further prevent the cooling oil level from dropping.

[0032] The oil absorption layer 21 can be composed of one or more filter materials. In the present embodiment, the oil absorption layer 21 includes stacked cellulose filter material, synthetic fiber filter material, and glass fiber filter material, and of course only one type of filter material can be selected, such as only using glass fiber filter material. Glass fiber filter material has high temperature resistance and chemical stability, and is suitable for use in high temperature and corrosive gas environments for oil mist filtration. It has high capture efficiency and long service life, and is most widely used.

[0033] The oil-repellent filter layer 22 can be composed of one or more oil-repellent modified filter materials. In the present embodiment, the oil-repellent filter layer 22 includes stacked oil-repellent modified glass fiber filter material, oil-repellent modified cellulose filter material, and oil-repellent modified synthetic fiber filter material. The above-mentioned oil-repellent modified filter material has a capture efficiency of at least 99.9% for escaped oil mist, which can effectively prevent the oil mist from evaporating to the outside, thereby further achieving the effect of preventing the cooling oil level from dropping.

[0034] Most of the oil mist can be absorbed and liquefied by the filter element 2, that is, first through the oil absorption layer 21 and then into the oil-repellent filter layer 22. In addition, even if the oil absorption layer 21 is saturated with oil, the porosity of the oil absorption layer 21 still exists due to the gelatinization of the oil absorption layer 21, so a certain amount of air permeability is maintained. Most of the oil mist will be gelatinized by the oil absorption layer 21, and due to the existence of a certain porosity therein, part of the oil mist will pass through the oil-repellent filter layer 22. Due to the good oil-repellent effect of the oil-repellent filter layer 22, this part of the escaped oil mist will be further blocked by the oil-repellent filter layer 22 and fall onto the oil absorption layer 21, or flow downward through the shunt groove 121.

[0035] In another preferred embodiment of the utility model, the filter element 2 includes the oil absorption layer 21, the suspended support and the oil-repellent filter layer 22 that are sequentially stacked from the air inlet cavity 11 to the air outlet cavity 13. The suspended support is used to isolate the oil absorption layer 21 and the oil-repellent filter layer 22, and promote the further capture of the escaped oil mist by the oil-repellent filter layer 22.

[0036] In order to facilitate the replacement of the filter element 2 or the waterproof air-permeable membrane 3, a mounting port is formed at the end of the air outlet cavity 13 of the shell 1 away from the filter cavity 12, and the mounting port is detachably connected with an end cover 15. The end cover 15 can be installed in the mounting port through a buckle structure or a threaded connection.

[0037] The side wall of the air outlet cavity 13 of the embodiment is provided with a plurality of circumferentially spaced air outlet ports 131. The laterally arranged air outlet ports 131 can avoid the direct impact of the pollutants entering from the air outlet ports 131 on the air-permeable membrane, so as to make the air-permeable membrane invalid.

[0038] The end of the air inlet cavity 11 of the embodiment close to the filter cavity 12 is configured to expand towards the filter cavity 12, which plays a role in reducing the flow rate and dispersing the oil mist, can increase the contact area of the oil mist with the end surface of the filter element 2, and improve the efficiency and uniformity of absorbing the oil mist.

[0039] In order to avoid the bottom of the filter element 2 blocking the starting end of the shunt groove 121, the shunt groove 121 can be extended into the air inlet cavity 11, or a support frame (not shown in the figure) for supporting the filter element 2 can be arranged in the air inlet cavity 11.

[0040] The end of the air inlet cavity 11 of the embodiment away from the filter cavity 12 is connected with a plurality of flow baffles 16 spaced along the length direction thereof, and adjacent flow baffles 16 are arranged in a staggered manner. The flow baffles 16 can reduce the flow rate of the oil mist, facilitate the effective separation of oil and gas, and also can avoid the large impact of the oil mist on the filter element 2.

[0041] In order to facilitate the installation of the oil mist filter on the power transmission system, a connecting thread or a connecting buckle for connecting with the power transmission system can be arranged on the shell 1, and a sealing ring ensuring the air tightness of the connection between the shell and the power transmission system can be installed.

[0042] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, it should be understood by those skilled in the art that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all of them are within the protection scope of the utility model.

Claims

1. An oil mist filter characterized by, The utility model relates to an oil mist filter, including: A shell (1) has the air inlet cavity (11) that communicates in proper order, filter cavity (12) and exhaust cavity (13), the inner wall of filter cavity (12) is provided with a plurality of from the air inlet cavity (11) to the direction of exhaust cavity (13) extension's shunt groove (121), the shunt groove (121) with air inlet cavity (11) communicate; Filter core (2) is installed in filter cavity (12), the outer wall of filter core (2) and the inner wall of filter cavity (12) are in contact and cover the shunt groove (121); Waterproof air-permeable membrane (3) seals the one end of filter cavity (12) towards exhaust cavity (13).

2. The oil mist filter of claim 1, wherein The shunt groove (121) is configured to spiral from the air inlet cavity (11) to the direction of exhaust cavity (13).

3. The oil mist filter of claim 2, wherein A plurality of shunt grooves (121) are evenly distributed along the circumference of the filter cavity (12).

4. The oil mist filter of claim 1, wherein The filter cavity (12) is provided with a limiting step (122) at the end towards the exhaust cavity (13), and the limiting step (122) is provided with a hollow gland (14) for pressing the filter core (2) into the filter cavity (12).

5. The oil mist filter of claim 4, wherein The hollow gland (14) includes a limiting portion (141) matched with the limiting step (122), and a pressing ring portion (142) connected to the limiting portion (141) towards the one end of the filter core (2), the limiting portion (141) is provided with a plurality of air-permeable holes (143) connecting the filter cavity (12) and the exhaust cavity (13) inside the pressing ring portion (142), the pressing ring portion (142) is in contact with the filter core (2), and the outer wall of the limiting portion (141) and / or the outer wall of the pressing ring portion (142) is in contact with the inner wall of the filter cavity (12).

6. The oil mist filter of claim 1, wherein: The end of the air inlet cavity (11) close to the filter cavity (12) is configured to expand towards the filter cavity (12); The end of the air inlet cavity (11) away from the filter cavity (12) is connected with a plurality of flow baffles (16) arranged along the length direction thereof, and adjacent flow baffles (16) are arranged staggered with each other; The shunt groove (121) extends into the air inlet cavity (11), or the air inlet cavity (11) is provided with a support frame.

7. The oil mist filter of claim 1, wherein The end of the exhaust cavity (13) away from the filter cavity (12) is provided with a mounting port, the mounting port is detachably connected with an end cover (15), and the side wall of the exhaust cavity (13) is provided with a plurality of exhaust ports (131) arranged in a circumferential direction.

8. The oil mist filter according to any one of claims 1 to 7, characterized in that The filter core (2) includes an oil absorption layer (21) and an oil-repellent filter layer (22) stacked in sequence from the air inlet cavity (11) to the exhaust cavity (13).

9. The oil mist filter of claim 8, wherein, The filter core (2) further includes a suspended support arranged between the oil absorption layer (21) and the oil-repellent filter layer (22).

10. The oil mist filter of claim 8, wherein, The oil absorption layer (21) includes at least one of cellulose filter material, synthetic fiber filter material and glass fiber filter material; The oil-repellent filter layer (22) includes at least one of oil-repellent modified glass fiber filter material, oil-repellent modified cellulose filter material and oil-repellent modified synthetic fiber filter material.

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