阅读说明：本技术 油浴滤清器 (Oil bath filter ) 是由 李国军 于 2021-08-10 设计创作，主要内容包括：本发明涉及汽车零部件技术领域,特别是涉及一种能够自动排水的油浴滤清器,该油浴滤清器至少包括滤清器本体,滤清器本体底部设有油盆,油盆具有输入口、输出口以及连通输入口和输出口的容纳腔,容纳腔内设有排水结构,排水结构包括本体、密封件、第一弹性件以及连接件,通过设置密封件以及与密封件连接的第一弹性件,可自动根据油盆中水的液面高度实现水的自动排出,同时可以通过设置具有预设弹性力的第一弹性件,排出预设范围内的水,可实现避免水面上的机油排出,实现排水不排油,降低对环境的污染。(The invention relates to the technical field of automobile parts, in particular to an oil bath filter capable of automatically draining, which at least comprises a filter body, wherein an oil basin is arranged at the bottom of the filter body, the oil basin is provided with an input port, an output port and a containing cavity communicated with the input port and the output port, a drainage structure is arranged in the containing cavity, the drainage structure comprises a body, a sealing element, a first elastic element and a connecting element, the automatic drainage of water can be automatically realized according to the liquid level height of water in the oil basin by arranging the sealing element and the first elastic element connected with the sealing element, meanwhile, the water in a preset range can be drained by arranging the first elastic element with preset elastic force, the discharge of engine oil on the water surface can be avoided, the drainage is realized without draining oil, and the pollution to the environment is reduced.)

1. The oil bath filter is characterized by comprising a filter body, wherein an oil basin is arranged at the bottom of the filter body, and the oil basin is provided with an input port, an output port and a containing cavity communicated with the input port and the output port; hold the intracavity and be equipped with drainage structures, drainage structures includes:

the body is provided with a water inlet, a water outlet and a drainage cavity communicated with the water inlet and the water outlet, the water inlet is communicated with the accommodating cavity, and the water outlet is communicated with the output port;

the sealing element is arranged in the drainage cavity and used for closing or opening the water inlet;

the first elastic piece is arranged in the drainage cavity and is provided with an initial position and a deformation position which is deformed under the action of water flowing in from the water inlet; and

the sealing element is connected with the first elastic element through the connecting element;

the sealing element seals the water inlet when the first elastic element is at an initial position so as to enable a flow path to be blocked between the water inlet and the water outlet, and opens the water inlet when the first elastic element is at a deformation position so as to enable a flow path to be conducted between the water inlet and the water outlet.

2. The oil bath filter according to claim 1, wherein a center of the first elastic member is recessed toward one side of the seal member to form a first recess;

the first recess has a first sidewall and a first bottom wall connected to the first sidewall, the first bottom wall being connected to the seal.

3. The oil bath filter of claim 2, wherein the thickness of the first side wall is less than the thickness of the first bottom wall.

4. The oil bath filter according to claim 1, wherein the body includes a mounting opening disposed opposite the water inlet opening and a cover plate covering the mounting opening;

the first elastic piece is arranged at the position of the mounting opening in a covering mode, and a separation cavity separated from the drainage cavity is formed between one side, far away from the sealing piece, of the first elastic piece and the cover plate in a surrounding mode.

5. The oil bath filter of claim 4, wherein a second resilient member is disposed within the compartment, the second resilient member having oppositely disposed first and second ends;

the first end of the second elastic piece is connected with the first elastic piece, and the second end of the second elastic piece is connected with the cover plate.

6. The oil bath filter of claim 4, wherein the cover plate removably covers the mounting opening.

7. The oil bath filter according to claim 1, wherein the center of the seal is recessed toward one side of the first elastic member to form a second recess;

the second recess has a second sidewall and a second bottom wall connected to the second sidewall, the second bottom wall being connected to the seal.

8. The oil bath filter according to claim 7, wherein the second side wall is formed with an abutting portion extending in a direction toward the water inlet, the abutting portion having elasticity.

9. The oil bath filter according to any of claims 1 to 8, wherein the seal and the first resilient member are sheet-like.

10. The oil bath filter according to any one of claims 1 to 8, wherein the water inlet is connected to a water inlet pipe, the water inlet end of which is provided with a downwardly inclined bend.

Technical Field

The invention relates to the technical field of automobile parts, in particular to an oil bath filter capable of automatically draining water.

Background

Currently, an oil bath air filter is typically installed in the air intake system of a dump truck to provide clean air to the engine. Oil bath formula air cleaner generally arranges on vehicle chassis, is whole air intake system's the minimum usually, and for preventing that fluid from spilling over, oil bath formula air cleaner is mostly airtight structure. In rainy days or car washing, rainwater or car washing water often enters the interior of the oil bath type air filter through the air inlet of the air inlet system or the front connecting part of the oil bath type air filter. Because the leakproofness structure of the empty filter of oil bath formula leads to these water to gather in the oil pan of oil bath filter, when the liquid level rose to certain extent, during the water that gathers will be inhaled paper filter module, cause paper filter core surface to soak, and then make the air intake system resistance increase, influence dynamic nature and oil consumption, intake can cause the engine to damage when serious.

Disclosure of Invention

In view of the above, it is necessary to provide an oil bath filter for automatically discharging water in an oil pan in order to solve the above-mentioned problems.

In order to achieve the purpose, the embodiment of the application provides an oil bath filter, which comprises a filter body, wherein an oil basin is arranged at the bottom of the filter body, and the oil basin is provided with an input port, an output port and a containing cavity communicated with the input port and the output port; hold the intracavity and be equipped with drainage structures, drainage structures includes:

the body is provided with a water inlet, a water outlet and a drainage cavity communicated with the water inlet and the water outlet, the water inlet is communicated with the accommodating cavity, and the water outlet is communicated with the output port;

the sealing element is arranged in the drainage cavity and used for closing or opening the water inlet;

the first elastic piece is arranged in the drainage cavity and is provided with an initial position and a deformation position which is deformed under the action of water flowing in from the water inlet; and

the sealing element is connected with the first elastic element through the connecting element;

the sealing element seals the water inlet when the first elastic element is at an initial position so as to enable a flow path to be blocked between the water inlet and the water outlet, and opens the water inlet when the first elastic element is at a deformation position so as to enable a flow path to be conducted between the water inlet and the water outlet.

In one embodiment, the center of the first elastic member is recessed toward one side of the sealing member to form a first recessed portion;

the first recess has a first sidewall and a first bottom wall connected to the first sidewall, the first bottom wall being connected to the seal.

In one embodiment, the thickness of the first side wall is smaller than the thickness of the first bottom wall.

In one embodiment, the body comprises a mounting opening opposite to the water inlet and a cover plate covering the mounting opening;

the first elastic piece is arranged at the position of the mounting opening in a covering mode, and a separation cavity separated from the drainage cavity is formed between one side, far away from the sealing piece, of the first elastic piece and the cover plate in a surrounding mode.

In one embodiment, a second elastic member is arranged in the separation cavity, and the second elastic member is provided with a first end and a second end which are oppositely arranged;

the first end of the second elastic piece is connected with the first elastic piece, and the second end of the second elastic piece is connected with the cover plate.

In one embodiment, the cover plate is detachably covered on the mounting opening.

In one embodiment, the center of the sealing member is recessed toward one side of the first elastic member to form a second recessed portion;

the second recess has a second sidewall and a second bottom wall connected to the second sidewall, the second bottom wall being connected to the seal.

In one embodiment, the second side wall extends towards the water inlet to form an abutting part, and the abutting part has elasticity.

In one embodiment, the sealing member and the first elastic member are sheet-shaped.

In one embodiment, the water inlet is connected with a water inlet pipe, and the water inlet end of the water inlet pipe is provided with a downward-inclined elbow.

In the oil bath filter, the oil bath filter at least comprises a filter body, an oil basin is arranged at the bottom of the filter body, the oil basin is provided with an input port, an output port and a containing cavity communicated with the input port and the output port, a drainage structure is arranged in the containing cavity, the drainage structure comprises a body, a sealing piece, a first elastic piece and a connecting piece, the body is provided with a water inlet, a water outlet and a drainage cavity communicated with the water inlet and the water outlet, the water inlet is communicated with the containing cavity, the water outlet is communicated with the output port, the sealing piece is arranged in the drainage cavity and used for sealing or opening the water inlet, the first elastic piece is arranged in the drainage cavity, the first elastic piece is provided with an initial position and a deformation position which is deformed under the action of water flowing in from the water inlet, the sealing piece is connected with the first elastic piece through the connecting piece, the sealing piece seals the water inlet when the first elastic piece is at the initial position so as to block a flow path between the water inlet and the water outlet, the water inlet is opened when first elastic component is in the deformation position to the sealing member to make and produce the flow path between water inlet and the delivery port and switch on, through setting up the sealing member and with the first elastic component that the sealing member is connected, can realize the automatic discharge of water according to the liquid level height of oil pan normal water automatically, can have the first elastic component of predetermineeing the elastic force through the setting simultaneously, the water of the within range is predetermine in the discharge, can realize avoiding the machine oil discharge on the surface of water, realize that the drainage does not discharge oil, reduce the pollution to the environment.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic perspective view of an oil bath filter according to an embodiment of the present disclosure;

FIG. 2 is a schematic illustration in partial cross-sectional view of an oil bath filter in an initial state in one embodiment of the example of the present application;

FIG. 3 is a schematic view, partly in section, of an oil bath filter in a flooded condition in one embodiment of the example herein;

FIG. 4 is a schematic cross-sectional view of a drainage structure in an initial state according to an embodiment of the present disclosure;

FIG. 5 is a schematic cross-sectional view of a drainage structure in a water intake state according to an embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view of a first elastic member according to an embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of a seal in one embodiment of an embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a drainage structure in an initial state according to another embodiment of the present application;

the reference numbers are as follows:

a filter body 100;

an oil pan 200;

an input port 210, an output port 220, a receiving cavity 230;

a drainage structure 240;

the water-saving drainage device comprises a body 241, a water inlet 2411, a water outlet 2412, a drainage cavity 2413, a mounting hole 2414 and a cover plate 2415;

the seal 242, the second recess 2421, the second side wall 24211, the second bottom wall 24212, the abutment 24213;

the first elastic member 243, the first recess 2431, the first side wall 24311, the first bottom wall 24312;

a connecting member 244;

the second elastic member 245;

inlet pipe 246, elbow 247;

a drain bag 300.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As background, it is common today to install an oil bath air cleaner in the air intake system of a dump truck to provide clean air to the engine. Oil bath formula air cleaner generally arranges on vehicle chassis, is whole air intake system's the minimum usually, and for preventing that fluid from spilling over, oil bath formula air cleaner is mostly airtight structure. In rainy days or car washing, rainwater or car washing water often enters the interior of the oil bath type air filter through the air inlet of the air inlet system or the front connecting part of the oil bath type air filter. Because the leakproofness structure of the empty filter of oil bath formula leads to these water to gather in the oil pan of oil bath filter, when the liquid level rose to certain extent, during the water that gathers will be inhaled paper filter module, cause paper filter core surface to soak, and then make the air intake system resistance increase, influence dynamic nature and oil consumption, intake can cause the engine to damage when serious.

In order to prevent the above problems, measures such as reducing the rainwater suction at the inlet of the air intake system, and adding a water removal and drainage structure in the pipeline at the front end of the air filter of the oil bath and adding a drainage structure at the inlet of the air filter of the oil bath are mainly taken, but the problem that the water enters the oil basin of the air filter of the oil bath cannot be solved, and the user inspection load is increased only by increasing the user inspection frequency in the use instruction.

In view of the above, it is necessary to provide an oil bath filter for automatically discharging water in an oil pan in order to solve the above-mentioned problems.

FIG. 1 is a schematic perspective view of an oil bath filter according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram showing a partial cross-sectional structure of an oil bath filter in an initial state in one embodiment of the examples of the present application; FIG. 3 is a schematic diagram showing a partial cross-sectional structure of an oil bath filter in a water-fed state in one embodiment of the present application; for convenience of explanation, only portions related to the embodiments of the present application are shown.

Referring to fig. 1 to 3, an oil bath filter provided by the embodiment of the present application includes a filter body 241100, an oil pan 200 is disposed at a bottom of the filter body 241100, the oil pan 200 has an input port 210, an output port 220, and a receiving cavity 230 communicating the input port 210 and the output port 220, a drainage structure 240 is disposed in the receiving cavity 230, and the drainage structure 240 may be fixed to the oil pan 200 by welding, etc. the drainage structure 240 in the embodiment of the present application may implement an automatic drainage function. Referring to fig. 2, in a normal state of the oil bath filter, a certain amount of oil is stored in the bottom of the oil pan 200 of the filter body 241100 to ensure the filtering function of the oil bath filter. Referring to fig. 3, when rainwater or washing water enters the oil pan 200 at the bottom of the filter body 241100 through the inlet 210, the water entering the oil pan 200 of the filter body 241100 is gradually accumulated to raise the liquid level, and the oil floats on the water due to the low specific gravity. When the liquid level rises to a certain degree, the drainage structure 240 is automatically opened under the pressure of water, at this time, water flows in through the water inlet 2411 of the drainage structure 240 and is discharged through the outlet 220 at the lower portion of the oil pan 200, and when the liquid level falls to a certain degree, the drainage structure 240 is closed. Therefore, by arranging the drainage structure 240 in the oil pan 200, water entering the oil pan 200 of the oil bath air filter can be solved, entering rainwater or car washing water is prevented from being accumulated in the oil pan 200 of the oil bath filter, and the accumulated water is effectively prevented from being sucked into the paper filter module.

The various components of the drainage structure 240 in some embodiments are described below in conjunction with specific figures.

FIG. 4 is a schematic cross-sectional view of a drainage structure 240 in an initial state according to an embodiment of the present application; FIG. 5 is a schematic cross-sectional view of a drainage structure 240 in a water inlet state according to an embodiment of the present application; for convenience of explanation, only portions related to the embodiments of the present application are shown.

Referring to fig. 4 to 5, in some embodiments, the drainage structure 240 includes a body 241, a sealing member 242, a first elastic member 243, and a connecting member 244. The body 241 has a water inlet 2411, a water outlet 2412 and a water drainage cavity 2413 for communicating the water inlet 2411 and the water outlet 2412, and particularly, in some embodiments, the body 241 may be made of the same material as the oil pan 200, and may be made of a metal material or a non-metal material. The water inlet 2411 is communicated with the accommodating chamber 230, and the water outlet 2412 is communicated with the output port 220. The sealing member 242 is disposed in the drain chamber 2413 to close or open the water inlet 2411. The first elastic member 243 is disposed in the drainage chamber 2413, and the first elastic member 243 has an initial position and a deformed position in which it is deformed by the water flowing in from the water inlet 2411. The sealing member 242 and the first elastic member 243 are connected by a connecting member 244, the sealing member 242 closes the water inlet 2411 when the first elastic member 243 is at the initial position, so as to block a flow path between the water inlet 2411 and the water outlet 2412, and the sealing member 242 opens the water inlet 2411 when the first elastic member 243 is at the deformed position, so as to conduct a flow path between the water inlet 2411 and the water outlet 2412. Due to the sealing member 242 and the first elastic member 243 connected to the sealing member 242, the water can be automatically discharged according to the level of the water in the oil pan 200. That is, for example, by selecting the material and size of the sealing member 242, the pressure that the sealing member 242 can withstand is designed to be 200 + 300Pa, and corresponding to the first elastic member 243 with the designed preset elastic force, when the first elastic member 243 is located at the initial position, under the action of the preset elastic force, the sealing member 242 closes the water inlet 2411, and when the pressure reached by the water accumulated in the oil basin 200 at the position where the drainage structure 240 is located exceeds 200 + 300Pa, the first elastic member 243 is located at the deformation position, the sealing member 242 is separated from the water inlet 2411, and the water in the oil basin 200 enters from the water inlet 2411 and is discharged from the water outlet 2412.

The inventors have found that since the oil entering from the filter is accumulated in the oil pan 200 and the oil in the oil pan 200 is also in the predetermined range, when rainwater or car wash water is accumulated in the oil pan 200, the oil is located at an upper layer of the accumulated water, and in order to prevent the environmental pollution caused by the drainage and the discharge of the oil, further, when the predetermined elastic force of the first elastic member 243 and the compressive strength of the sealing member 242 are designed, the approximate height of the oil layer can be determined according to the user inspection frequency of the oil bath filter, and when the discharge of the water in the predetermined range is designed at the allowable oil layer height, the predetermined elastic force of the first elastic member 243 and the compressive strength of the sealing member 242 are obtained, thereby preventing the discharge of the oil on the water surface, preventing the discharge of the oil from the water, and reducing the environmental pollution. In some embodiments, the drainage structure 240 may be disposed at the bottom of the oil pan 200 for better drainage effect and drainage without oil.

Fig. 6 is a schematic cross-sectional view illustrating the first elastic member 243 according to an embodiment of the present application.

Referring to fig. 6, in order to achieve that the elastic member controls the elastic force of the sealing member 242 to be more stable, in some embodiments, the center of the first elastic member 243 is recessed toward one side of the sealing member 242 to form a first recessed portion 2431, the first recessed portion 2431 has a first side wall 24311 and a first bottom wall 24312 connected to the first side wall 24311, the first bottom wall 24312 is connected to the sealing member 242, and the elastic force is further strengthened by the structure of the first recessed portion 2431, so that the elastic member can be stably switched between the initial state and the deformed state, and the problem of sudden change of the elastic member is solved. In some embodiments, the thickness of the first side wall 24311 is smaller than the thickness of the first bottom wall 24312, that is, the elastic force of the first side wall 24311 is greater than the elastic force of the first bottom wall 24312, so that the gradual change action of the elastic member in the switching state can be further stably achieved. It is understood that the first elastic member 243 may be made of a material having elasticity. In other embodiments, an extension edge may be designed on the outer edge of the first side wall 24311, that is, the first elastic member 243 is similar to a hat structure having a visor, and in this case, the first recess 2431 is a partial structure of the elastic member, and the elastic member further includes an extension edge. The position and specific size of the first recess 2431 can be adjusted according to the design, and the embodiment of the present application does not specifically limit this.

With continued reference to fig. 4 to fig. 5, in some embodiments, the body 241 includes a mounting opening 2414 opposite to the water inlet 2411 and a cover plate 2415 covering the mounting opening 2414, the mounting opening 2414 is covered with a first elastic member 243, a separation chamber separated from the drainage chamber 2413 is defined between one side of the first elastic member 243 away from the sealing member 242 and the cover plate 2415, and a deformation space of the first elastic member 243 is increased by the separation chamber. In some embodiments, in order to obtain a further stable and enhanced elastic force, a second elastic member 245 is disposed in the separation chamber, the second elastic member 245 has a first end and a second end which are oppositely disposed, the first end of the second elastic member 245 is connected to the first elastic member 243, and the second end of the second elastic member 245 is connected to the cover plate 2415. In some embodiments, the second elastic member 245 may be provided as a spring. Accordingly, the preset elastic force of the second elastic member 245 may be designed to achieve a preset drainage process in combination with the processes set forth in some of the above embodiments. Since the second elastic member 245 is located in the separation chamber, the second elastic member 245 can be protected from oil and water. In other embodiments, the cover 2415 can be detachably covered on the mounting opening 2414, and the detachable cover 2415 can facilitate the replacement of the first elastic member 243 and the second elastic member 245 to adjust the elastic force to the required magnitude.

Fig. 7 shows a schematic cross-sectional structure of the sealing member 242 in an embodiment of the present application.

Referring to fig. 7, in some embodiments, in order to obtain a better sealing effect, the center of the sealing element 242 is recessed towards one side of the first elastic element 243 to form a second recessed portion 2421, the second recessed portion 2421 has a second side wall 24211 and a second bottom wall 24212 connected to the second side wall 24211, the second bottom wall 24212 is connected to the sealing element 242, and in particular, in some embodiments, the second side wall 24211 extends towards the water inlet 2411 to form an abutting portion 24213, and the abutting portion 24213 has elasticity, so that when the sealing element 242 closes the water inlet 2411, the abutting portion 24213 having elasticity can perform better sealing, so as to obtain a better sealing effect.

In some embodiments, the sealing member 242 and the first elastic member 243 are sheet-shaped, that is, the sealing member 242, the first elastic member 243, the connecting member 244 and the body 241 of the drain structure 240 form the double-cavity double-membrane type automatic drain structure 240, which is quick to open, high in sealing performance and reliability when closed, and capable of smoothly and automatically draining water accumulated in the oil pan 200.

FIG. 8 is a schematic cross-sectional view of a drainage structure 240 in an initial state according to another embodiment of the present application; for convenience of explanation, only portions related to the embodiments of the present application are shown.

In some embodiments, in order to better achieve the effect of draining water without draining oil, the water inlet 2411 is connected with a water inlet pipe 246, and the water inlet end of the water inlet pipe 246 is provided with a downward-inclined elbow 247. Of course, in other embodiments, the water inlet conduit 246 may be directly provided in a downwardly sloping configuration. In other embodiments, a water level alarm may be further disposed in the oil pan 200 to realize water level alarm, and meanwhile, a drain bag 300 structure may be further disposed at the output port 220 to buffer and receive drained water.

In summary, in the embodiment of the present application, the second elastic member 245 in the cavity formed by the sealing member 242 and the cover plate 2415 is a power unit in the automatic drainage structure 240, the power unit controls the sealing member 242 to form another cavity with the inner end surface of the body 241 to achieve the sealing and drainage functions, and meanwhile, the connecting rod fixed on the sealing member 242 is linked with the sealing member 242. When the liquid level in the oil pan 200 under the filter body 241100 rises to a predetermined height, the water entering through the water inlet 2411 of the body 241 generates a thrust force on the surface of the sealing element 242 under the action of pressure, the thrust force acts on the first elastic element 243 and the second elastic element 245 through the connecting rods, the sealing element 242 is driven to separate from the water inlet 2411 through the connecting element 244 and the pre-tightening force of the second elastic element 245 is overcome, and then the water entering through the water inlet 2411 of the drainage structure 240 enters the drainage cavity 2413 and is discharged to the output port 220 through the water outlet 2412 at the lower part.

Because the automatic drainage structure 240 with the double-cavity double-membrane form is designed in the oil bath filter, rainwater can be automatically drained according to the rainwater level in the oil basin 200, the drainage structure 240 not only can realize the rainwater self-draining function, but also can avoid engine oil on the water surface to be drained according to the spring pretightening force mutually controlled by the double membranes (the sealing element 242 and the first elastic element 243) and the elastic force of the second elastic element 245, so that drainage is realized without draining oil, and the pollution to the environment is reduced. Meanwhile, the structure can also reduce the noise generated in the drainage process. Therefore, through some embodiments, the paper filtering module of the oil bath filter is protected, and the problems that the oil consumption is increased and the power performance is reduced to cause the damage of the engine due to the fact that the paper filter element is soaked are avoided.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.