Novel breather valve structure and oil tank air filter

Abstract

The novel breather valve structure comprises a base, an upper ventilation chamber and a lower ventilation chamber which are vertically arranged in parallel are arranged in the base, a first ventilation opening is formed in the side wall of the upper ventilation chamber, a second ventilation opening is formed in the lower portion of the upper ventilation chamber, a first valve is arranged at the position of the second ventilation opening, and a second valve is arranged at the position of the second ventilation opening. A third vent is formed in the middle of the first valve, a second valve is arranged at the third vent, a vertical first connecting rod is fixedly connected to the middle of the bottom face of the second valve, a first compression spring and a second compression spring abut against the lower portion of the first valve, and the lower end of the first compression spring abuts against the first connecting rod. The lower end of the second compression spring abuts against the bottom wall of the lower ventilation chamber, and a fourth ventilation opening is formed in the bottom wall of the lower ventilation chamber. The second vent is arranged in the middle of the base, and the first valve and the second valve are close to the first vent, so that the problem that air inside and outside the oil tank cannot be exchanged in time is solved.

Description

A novel breather valve structure and fuel tank air filter Technical Field

[0001] This utility model relates to air filtration technology for fuel tanks, specifically to a novel breather valve structure and a fuel tank air filter. Background Technology

[0002] The operation of the oil pump can cause negative pressure in the oil tank due to oil intake. Additionally, temperature fluctuations can cause liquid oil to evaporate, leading to excessively high pressure within the tank. In these situations, the enclosed space inside the oil tank needs to be connected to the outside atmosphere to draw in air or expel high-pressure gas. This is achieved by adding a primary filter to filter the air, preventing the intake of dust during the intake and exhaust process and ensuring the lifespan of the liquid oil. However, in a fuel tank air filter (publication number CN217490103U), the breather valve's inlet and outlet valves are far from the vent, preventing timely exchange of air between the outside and the tank's internal air, resulting in uncontrolled internal pressure. Furthermore, the breather valve's internal structure creates a tortuous air path, increasing the filter's resistance to airflow and causing significant pressure loss, impacting machine operation. Summary of the Invention

[0003] To address the problems in the existing technology, this utility model provides a novel breather valve structure and a fuel tank air filter, with the aim of enabling timely exchange of external gas and internal fuel tank air.

[0004] A novel breathing valve structure includes a base, within which are arranged an upper ventilation chamber and a lower ventilation chamber arranged vertically. A first ventilation port for connecting to the outside is opened on the side wall of the upper ventilation chamber, and a second ventilation port for connecting to the lower ventilation chamber is opened at the lower part of the upper ventilation chamber. A first valve for sealing the second ventilation port from bottom to top is provided at the second ventilation port. A third ventilation port for connecting the upper and lower ventilation chambers is opened in the middle of the first valve, and a second valve for sealing the third ventilation port from top to bottom is provided at the third ventilation port. A vertical first connecting rod is fixedly connected to the middle of the bottom surface of the second valve. A first compression spring and a second compression spring, both vertical, abut against the lower part of the first valve. The lower end of the first compression spring abuts against the first connecting rod, and the lower end of the second compression spring abuts against the bottom wall of the lower ventilation chamber. A fourth ventilation port for connecting to the space to be ventilated is opened on the bottom wall of the lower ventilation chamber.

[0005] Furthermore, a vertical second connecting rod is fixedly connected to the middle of the top surface of the second valve. The second connecting rod passes through the top wall of the upper vent chamber and moves in coordination with it.

[0006] Furthermore, the bottom wall of the lower ventilation chamber is composed of a fixed plate, which is positioned at the bottom of the side wall of the lower ventilation chamber by a snap ring, and several fourth ventilation ports are distributed on the fixed plate.

[0007] Furthermore, the lower part of the upper vent chamber is an open structure and forms the second vent, the top wall of the lower vent chamber forms an annular platform around the second vent, and the outer edge of the first valve is attached to the annular platform to form a sealing structure.

[0008] Furthermore, the middle part of the first valve protrudes upward to form a guide section, which has a frustum-shaped structure that is larger at the top and smaller at the bottom.

[0009] Furthermore, a first sealing ring is embedded on the outer edge of the first valve, and the first sealing ring is located between the first valve and the annular platform to achieve a sealed connection between the two.

[0010] Furthermore, vertical upper sliding plates are distributed around the third vent on the bottom surface of the first valve, and vertical lower sliding plates are fixedly installed on the bottom wall of the lower vent chamber at the position corresponding to the gap between adjacent upper sliding plates. The side of the lower sliding plate is in contact with and slides with the side of the upper sliding plate. A second clearance opening is provided in the middle of the baffle for making way for the first connecting rod, and the first connecting rod passes through the second clearance opening.

[0011] Furthermore, a flange is integrally installed on the outer wall of the lower part of the base.

[0012] An air filter for a fuel tank includes the novel breather valve structure described above. The lower part of the base protrudes outward to form an annular flange, and the middle part of the top surface of the base protrudes upward to form a boss. An outer cover is threadedly connected to the boss. The outer cover extends downward and covers the middle part of the base. A filter cartridge is disposed between the outer cover and the base. The top of the filter cartridge abuts against the top of the outer cover and seals with it. The lower part of the filter cartridge abuts against the annular flange and seals with it. A first gap is left between the outer wall of the filter cartridge and the side wall of the outer cover. The lower end of the outer cover is an open structure and forms a fifth vent.

[0013] Furthermore, the outer cover is fixed and limited by a nut and a sealing gasket. The nut is threaded onto the boss, and the sealing gasket is sealed between the outer cover and the nut. A pull rope is provided between the nut and the base. The upper end of the pull rope is sleeved on the nut and rotates with it. The lower end of the pull rope is detachably and fixedly connected to the lower part of the base.

[0014] The beneficial effects of this utility model are as follows: by setting the second vent in the middle of the base and placing the first valve and the second valve close to the first vent, the problem of the inability to exchange air inside and outside the oil tank in a timely manner is solved; by improving the various components linked to the first valve and the second valve, as well as the spatial structure of the valve seat, the path of air flow through the filter is optimized, the resistance of the filter to air is reduced, and the performance of the product is effectively improved. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the breather valve structure in this utility model;

[0016] Figure 2 is a schematic diagram of the guide structure of the first valve in this utility model;

[0017] Figure 3 is a schematic diagram of the structure of the fuel tank air filter in this utility model. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.

[0019] A novel breathing valve structure, as shown in Figure 1, includes a base 1. To facilitate fixing the base 1, a flange 15 is integrally formed on the outer wall of the lower part of the base 1. An upper ventilation chamber 11 and a lower ventilation chamber 12 are arranged side-by-side inside the base 1. A first ventilation port 13 for connecting to the outside is opened on the side wall of the upper ventilation chamber 11. A second ventilation port 14 for connecting to the lower ventilation chamber 12 is opened at the lower part of the upper ventilation chamber 11. A first valve 2 for sealing the second ventilation port 14 from bottom to top is provided at the second ventilation port 14. A third ventilation port 23 for connecting the upper ventilation chamber 11 and the lower ventilation chamber 12 is opened in the middle of the first valve 2. A second valve 3 for sealing the third ventilation port 23 from top to bottom is provided at the third ventilation port 23. A vertical first connecting rod 31 is fixedly connected to the middle of the bottom surface of the second valve 3. A first compression spring 41 and a second compression spring 42, both vertical, abut against the lower part of the first valve 2. The first compression spring 41 is coaxially sleeved inside the second compression spring 42. The lower end of the first compression spring 41 abuts against the first connecting rod 31 through the fixing nut 311. The lower end of the second compression spring 42 abuts against the bottom wall of the lower vent chamber 12. A fourth vent 51 for connecting the space to be ventilated is provided on the bottom wall of the lower vent chamber 12. To facilitate manual venting, a vertical second connecting rod 32 is fixedly connected to the middle of the top surface of the second valve 3. The second connecting rod 32 passes through the top wall of the upper vent chamber 11 and moves in cooperation with it. After pressing the second connecting rod 32, the second valve 3 is pushed to move downward. At the same time, the second valve 3 drives the first valve 2 to move, thereby opening the second vent 14 of the first valve 2. The gas in the space to be ventilated passes through the fourth vent 51, the lower vent chamber 12, the second vent 14, the upper vent chamber 11 and the first vent 13 in sequence and connects with the outside, thereby realizing manual venting.

[0020] To facilitate the assembly of the first valve 2 within the lower vent chamber 12, the bottom wall of the lower vent chamber 12 is composed of a fixing plate 5. The fixing plate 5 is positioned at the bottom of the side wall of the lower vent chamber 12 by a snap ring 52. Several fourth vents 51 are distributed on the fixing plate 5, and the second compression spring 42 abuts against the fixing plate 5. During assembly, the first valve 2 and the second compression spring 42 are first placed inside the lower vent chamber 12, and then the fixing plate 5 is installed at the lower part of the lower vent chamber 12. In addition, to ensure that the first compression spring 41 and the first connecting rod 31 have sufficient room for movement, a first clearance opening 53 is provided on the fixing plate 5 for the first compression spring 41 and the first connecting rod 31 to make way. In this embodiment, the first compression spring 41 and the first connecting rod 31 are both disposed through the first clearance opening 53. To facilitate the entry of the second valve 3 into the upper vent chamber 11, the lower part of the upper vent chamber 11 is an open structure and forms the aforementioned fourth vent. The second vent 14 allows the second valve 3 to be directly inserted into the upper vent chamber 11 through the open structure. The top wall of the lower vent chamber 12 forms an annular platform 16 around the second vent 14. The outer edge of the first valve 2 is attached to the annular platform 16 to form a sealing structure. To facilitate the installation of the first valve 2 at the second vent 14, the middle part of the first valve 2 protrudes upward to form a guide part 21, which is a frustoconical structure that is larger at the top and smaller at the bottom. To ensure the sealing performance of the first valve 2 to the second vent 14, a first sealing ring 22 is embedded on the outer edge of the first valve 2. The first sealing ring 22 is located between the first valve 2 and the annular platform 16 and achieves a sealing connection between the two. To ensure the sealing performance of the second valve 3 to the third vent 23, a second sealing ring 33 is embedded on the outer edge of the second valve 3. The second sealing ring 33 is located between the first valve 2 and the second valve 3 and achieves a sealing connection between the two.

[0021] In addition, due to the large diameter of the first valve 2, in order to improve the stability of the first valve 2 when it moves, as shown in Figure 2, vertical upper sliding plates 24 are distributed around the third vent 23 on the bottom surface of the first valve 2. Vertical lower sliding plates 54 are fixedly installed on the bottom wall of the lower vent chamber 12 at the position corresponding to the gap between adjacent upper sliding plates 24. The side of the lower sliding plate 54 is in contact with and slides with the side of the upper sliding plate 24, thereby guiding the first valve 2 up and down. A baffle 25 is integrally provided at the lower part of the upper sliding plate 24. The baffle 25 is located between the upper sliding plates 24. The upper end of the first compression spring 41 abuts against the baffle 25 and indirectly abuts against the first valve 2 through the baffle 25 and the upper sliding plate 24. A second clearance port 251 is opened in the middle of the baffle 25 to allow the first connecting rod 31 to move. The first connecting rod 31 passes through the second clearance port 251.

[0022] An air filter for a fuel tank includes the novel breather valve structure described above, as shown in Figure 3. The lower part of a base 1 protrudes outward to form an annular flange 17. The center of the top surface of the base 1 protrudes upward to form a boss 18. An outer cover 7 is threaded onto the boss 18. The outer cover 7 extends downward and covers the center of the base 1. A filter cartridge 6 is disposed between the outer cover 7 and the base 1. The top of the filter cartridge 6 abuts against the top of the outer cover 7 and seals with it. The lower part of the filter cartridge 6 abuts against the annular flange 17 and seals with it. The outer wall of the filter cartridge 6 and the side of the outer cover 7... A first gap is left between the walls, and the lower end of the outer cover 7 is an open structure forming a fifth vent. The outer cover 7 is fixed and limited by a nut 8 and a sealing gasket 81. The nut 8 is threaded onto the boss 18, and the sealing gasket 81 is sealed between the outer cover 7 and the nut 8. To prevent the nut 8 from being lost, a pull rope 9 is provided between the nut 8 and the base 1. The upper end of the pull rope 9 is sleeved on the nut 8 and rotates with it. The lower end of the pull rope 9 is detachably and fixedly connected to the lower part of the base 1. Specifically, the lower end of the pull rope 9 is bolted to the base 1 through a fixing ear plate 91.

[0023] When automatically intake air, if the air pressure in the space to be ventilated is lower than the outside air pressure, the first valve 2 presses down the second compression spring 42 and opens the second vent 14. Air then enters the space to be ventilated after passing through the fifth vent, filter cartridge 6, first vent 13, upper vent chamber 11, second vent 14, lower vent chamber 12, and fourth vent 51 in sequence. When automatically exhaust air, if the outside air pressure is lower than the air pressure in the space to be ventilated, the second valve 3 presses up the first compression spring 41 via the first connecting rod 31 and opens the third vent 23. Gas in the space to be ventilated then passes through the fourth vent 51, lower vent chamber 12, third vent 23, upper vent chamber 11, first vent 13, filter cartridge 6, and fifth vent in sequence before being exhausted to the outside. This achieves the automatic intake and exhaust function.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel breathing valve structure, comprising a base, characterized in that: The base has an upper vent chamber and a lower vent chamber arranged side by side. A first vent is provided on the side wall of the upper vent chamber to connect to the outside. A second vent is provided at the bottom of the upper vent chamber to connect to the lower vent chamber. A first valve is provided at the second vent to block the second vent from bottom to top. A third vent is provided in the middle of the first valve to connect the upper vent chamber and the lower vent chamber. A second valve is provided at the third vent to block the third vent from top to bottom. A vertical first connecting rod is fixedly connected to the middle of the bottom surface of the second valve. A first compression spring and a second compression spring, both vertical, are abutted below the first valve. The lower end of the first compression spring abuts against the first connecting rod, and the lower end of the second compression spring abuts against the bottom wall of the lower vent chamber. A fourth vent is provided on the bottom wall of the lower vent chamber to connect to the space to be ventilated.

2. The novel breathing valve structure according to claim 1, characterized in that: A vertical second connecting rod is fixedly connected to the middle of the top surface of the second valve. The second connecting rod passes through the top wall of the upper vent chamber and moves in coordination with it.

3. The novel breathing valve structure according to claim 1, characterized in that: The bottom wall of the lower ventilation chamber is composed of a fixed plate, which is positioned at the bottom of the side wall of the lower ventilation chamber by a snap ring, and several fourth ventilation ports are distributed on the fixed plate.

4. The novel breathing valve structure according to claim 3, characterized in that: The lower part of the upper vent chamber is an open structure and forms the second vent. The top wall of the lower vent chamber forms an annular platform around the second vent. The outer edge of the first valve is attached to the annular platform to form a sealing structure.

5. The novel breathing valve structure according to claim 4, characterized in that: The middle part of the first valve protrudes upward to form a guide section, which has a frustum-shaped structure that is larger at the top and smaller at the bottom.

6. The novel breathing valve structure according to claim 4, characterized in that: A first sealing ring is embedded on the outer edge of the first valve. The first sealing ring is located between the first valve and the annular platform and achieves a sealing connection between the two.

7. The novel breathing valve structure according to claim 1, characterized in that: Vertical upper slide plates are distributed around the third vent on the bottom surface of the first valve. Vertical lower slide plates are fixedly installed on the bottom wall of the lower vent chamber at the position corresponding to the gap between adjacent upper slide plates. The side of the lower slide plate is in contact with and slides with the side of the upper slide plate. A baffle is integrally installed at the lower part of the upper slide plate. The baffle is located between the upper slide plates. The upper end of the first compression spring abuts against the baffle. A second clearance opening is opened in the middle of the baffle to allow the first connecting rod to pass through the second clearance opening.

8. The novel breathing valve structure according to claim 1, characterized in that: A flange is integrally installed on the outer wall at the bottom of the base.

9. A fuel tank air filter, characterized in that: The novel breathing valve structure as described in claim 1 includes a base with a lower part protruding outward to form an annular flange, a top surface of the base with a middle part protruding upward to form a boss, an outer cover threadedly connected to the boss, the outer cover extending downward and covering the middle part of the base, a filter cartridge disposed between the outer cover and the base, the top of the filter cartridge abutting against the top of the outer cover and sealingly engaging with it, the lower part of the filter cartridge abutting against the annular flange and sealingly engaging with it, a first gap being left between the outer wall of the filter cartridge and the side wall of the outer cover, and the lower end of the outer cover having an open structure forming a fifth vent.

10. The fuel tank air filter according to claim 9, characterized in that: The outer cover is fixed and limited by a nut and a sealing gasket. The nut is threaded onto the boss, and the sealing gasket is sealed between the outer cover and the nut. A pull rope is provided between the nut and the base. The upper end of the pull rope is sleeved on the nut and rotates with it. The lower end of the pull rope is detachably and fixedly connected to the lower part of the base.

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