Agricultural machinery oil tank pressure balance breather valve assembly

Abstract

The utility model relates to the technical field of oil tanks, in particular to an agricultural machine oil tank pressure balance breather valve assembly which comprises a rectangular box body, an air guide vertical pipe penetrates through the bottom of the rectangular box body, the interior of the rectangular box body is divided into an exhaust cavity and an air inlet cavity through a partition plate, the exhaust cavity is communicated with the air guide vertical pipe, and the air inlet cavity is communicated with the air guide vertical pipe through an L-shaped air guide pipe. A box cover is arranged at the top of the rectangular box body, an exhaust port and an air inlet are formed in the top of the box cover, an exhaust sealing piece used for blocking the air guide vertical pipe is arranged at the exhaust port, an air inlet sealing piece used for blocking the air inlet is arranged in the air inlet cavity, and dust filtering assemblies are arranged at the positions, located at the exhaust port and the air inlet, of the top of the box cover. According to the pressure balance breather valve assembly of the agricultural machine oil tank, particulate matter in outside air is intercepted in the air inlet and exhaust process through the design of the filter screen plate of the dust filtering assembly, meanwhile, the dynamic sealing function of the sealing piece is combined, direct communication between the interior of the oil tank and the outside is avoided, and the gasoline volatilization rate is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil tank, concretely is agricultural machinery oil tank pressure balance breathing valve subassembly. BACKGROUND

[0002] The agricultural machinery oil tank is an important component for storing fuel in agricultural machinery, mainly used for supplying fuel required by the engine to ensure the normal operation of the mechanical equipment. The design of the oil tank not only needs to consider the storage capacity of the oil, but also must ensure the safety and reliability under various working conditions. During the agricultural operation, due to the factors such as the flow and temperature change of the oil, pressure fluctuation will occur inside the oil tank. If there is no effective pressure regulating mechanism, it may cause the oil tank to deform, oil and gas leakage and even safety hazards, therefore, the oil tank breathing valve is particularly important.

[0003] The patent with publication number CN211852931U discloses an oil tank breathing valve, which comprises a valve body and an air vent hole. The valve body forms a valve cavity that can communicate with the oil tank. The top surface of the valve body is provided with a liquid accumulation groove with a notch facing upward. The air vent hole is located at the top of the valve body, one end of which penetrates through the bottom of the liquid accumulation groove, and the other end of which communicates with the valve cavity of the valve body. The liquid accumulation groove of this scheme can collect the fuel leaked from the air vent hole of the oil tank, reducing the occurrence of dynamic leakage of the oil tank breathing valve.

[0004] However, in the specific use process of the prior art, the air vent hole is usually in an open state. Only when the oil tank is inverted, the valve core will close the air vent hole under the action of gravity and spring return force, so as to avoid the oil in the oil tank from leaking to the outside through the air vent hole, thereby playing a safety protection role. However, in the normal use condition, the design of the air vent hole connects the inside of the oil tank with the outside air, which not only accelerates the volatilization of gasoline, but also may cause the particulate matters in the outside air to enter the oil tank through the air vent hole, resulting in oil pollution and quality decline. Therefore, the existing breathing valve design has many defects in actual use, and needs to be improved. In view of this, we propose the agricultural machinery oil tank pressure balance breathing valve subassembly, which aims to solve the above problems through a more optimal design and structure, realize better pressure balance and sealing performance, and thus improve the safety of the agricultural machinery oil tank. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing agricultural machinery oil tank pressure balance breathing valve subassembly to solve the problems in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The agricultural machinery oil tank pressure balance breathing valve subassembly comprises a rectangular box body, which is used for separating air flow channels and accommodating an exhaust chamber, an air inlet chamber and a gas guide vertical pipe. Figure 1 And Figure 3As shown, the bottom of the rectangular box is provided with a gas guide vertical pipe which is in direct communication with the oil tank pressure balance hole and transmits gas, the rectangular box is divided into an exhaust cavity and an intake cavity by a partition plate, the exhaust cavity is used for temporarily storing and guiding the overpressure gas to be discharged, and the intake cavity is used for receiving the filtered external air and introducing it into the oil tank, the exhaust cavity is in communication with the gas guide vertical pipe, and the intake cavity is in communication with the gas guide vertical pipe through an L-shaped gas guide pipe.

[0008] The top of the rectangular box is provided with a box cover which is used for sealing the rectangular box and fixing the dust filtering assembly, the top of the box cover is provided with an exhaust port and an intake port, the exhaust port is used for discharging the overpressure gas to the dust filtering assembly, and the intake port is used for introducing the filtered external air, the exhaust port is provided with an exhaust sealing element which is used for plugging the gas guide vertical pipe, the exhaust sealing element controls the opening and closing of the gas guide vertical pipe through air pressure to release the overpressure gas, when the air pressure in the agricultural machine oil tank becomes larger, the internal air pressure pushes the first sealing plate of the exhaust sealing element to move upward, the top of the gas guide vertical pipe is opened, the air in the agricultural machine oil tank can enter the exhaust cavity from the gas guide vertical pipe, then enter the external threaded fixed pipe from the exhaust port, and finally be discharged to the outside from the air hole, so as to realize the internal pressure balance of the agricultural machine oil tank.

[0009] The intake cavity is provided with an intake sealing element which is used for plugging the intake port, the intake sealing element controls the opening and closing of the intake port through negative pressure to prevent the negative pressure of the oil tank, when the air pressure in the agricultural machine oil tank becomes smaller, in order to avoid the negative pressure in the agricultural machine oil tank, the external air pushes the second sealing plate of the intake sealing element to move downward, the intake port is opened, the external air passes through the air hole, the outer pipe and the external threaded fixed pipe of the dust filtering assembly in sequence, and then enters the intake cavity through the intake port, and then passes through the L-shaped gas guide pipe and the gas guide vertical pipe in sequence to enter the agricultural machine oil tank, so as to realize the internal pressure balance of the agricultural machine oil tank.

[0010] The top of the box cover is provided with a dust filtering assembly which is used for filtering the particulate matters in the air and preventing rainwater from entering.

[0011] Preferably, as shown in Figure 1 The bottom of the outer wall of the gas guide vertical pipe is provided with an annular mounting seat, the annular mounting seat is mounted on the outer wall of the agricultural machine oil tank through bolts, and the gas guide vertical pipe is in communication with the pressure balance hole of the agricultural machine oil tank.

[0012] Preferably, as shown in Figure 2 The top of the outer wall of the rectangular box is provided with a frame-shaped butt joint plate, and the frame-shaped butt joint plate is connected with the box cover through bolts and nuts.

[0013] Preferably, in combination with Figure 3 and Figure 4As shown, the exhaust sealing component includes a cross-shaped fixed block. The outer wall of the cross-shaped fixed block is fixedly connected to the inner wall of the exhaust port, which can be fixed by adhesive bonding. The cross-shaped fixed block is used to fix the first fixed tube and provide structural support. The bottom of the cross-shaped fixed block is provided with a first fixed tube, which is used to accommodate a first spring and guide the movement of a first sliding rod. The first spring is provided inside the first fixed tube and is used to provide the reset elastic force of the first sealing plate. The bottom end of the first spring is provided with a first sliding rod, which is used to connect the first spring and the first sealing plate to transmit the air pressure force. The bottom end of the first sliding rod is provided with a first sealing plate, which is used to open the air guide vertical pipe when pushed by air pressure.

[0014] A first rubber pad is bonded to the bottom of the first sealing plate. The bottom of the first rubber pad is in close contact with the top of the air duct. The first rubber pad is used to enhance the sealing of the top of the air duct.

[0015] Preferred, combined Figure 2 and Figure 3 As shown, the air intake seal includes a second fixed tube fixedly connected to the bottom of the inner wall of the air intake chamber. The second fixed tube is used to accommodate the second spring and guide the movement of the second slide rod. The second fixed tube is provided with a second spring, which is used to provide the second sealing plate with a reset elastic force. The top of the second spring is provided with a second slide rod, which is used to connect the second spring and the second sealing plate to transmit the air pressure force. The top of the second slide rod is provided with a second sealing plate, which is used to open the air intake port by being pushed by the external air pressure.

[0016] A second rubber gasket for sealing the air inlet is adhered to the top of the second sealing plate. The top of the second rubber gasket fits tightly against the bottom of the cover. The second rubber gasket is used to enhance the sealing of the air inlet.

[0017] Preferred, such as Figure 5 As shown, the dust filter assembly includes an externally threaded fixing tube fixedly connected to the top of the box cover. It can be fixed by adhesive bonding. The externally threaded fixing tube is used to connect the outer tube and fix the filter screen plate. The two externally threaded fixing tubes of the dust filter assembly are respectively connected to the exhaust port and the air inlet. The filter screen plate is placed on the top of the externally threaded fixing tube. The filter screen plate is used to intercept particulate matter in the air. The outer thread of the externally threaded fixing tube is connected to the outer tube. The outer tube is used to protect the filter screen plate and form a gas channel. The inner wall of the outer tube is provided with an annular positioning plate for positioning the filter screen plate. The annular positioning plate is used to prevent the filter screen plate from shifting.

[0018] Multiple air holes are provided on the outer wall of the outer tube near the top. The air holes are located above the annular positioning plate. A rain cover is provided on the top of the outer tube to prevent rainwater from directly entering the air holes.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The pressure balance breather valve assembly of this agricultural machinery oil tank, through the filter screen and rain cover design of the dust filter assembly, intercepts particulate matter in the outside air during the intake and exhaust process and prevents rainwater from entering. At the same time, combined with the dynamic sealing function of the seal, it avoids direct communication between the inside of the oil tank and the outside, significantly reducing the gasoline evaporation rate and ensuring the purity of the oil.

[0021] 2. The pressure balance breather valve assembly of this agricultural machinery oil tank utilizes the spring linkage structure of the exhaust seal and the intake seal to automatically open and close the air passage according to the pressure difference inside and outside the oil tank. It can quickly release overpressure gas and introduce external air in time to compensate for negative pressure, thus achieving dynamic balance. Combined with the tight fit design of the oil-resistant rubber gasket, it greatly improves the sealing reliability and avoids oil and gas leakage or the infiltration of external contaminants.

[0022] 3. The pressure balance breather valve assembly of the agricultural machinery oil tank adopts a modular design, such as the bolt connection between the cover and the rectangular box and the threaded disassembly structure of the dust filter assembly, which facilitates quick disassembly and cleaning of the filter screen or replacement of the seals, reducing maintenance costs. At the same time, the overall layout is reasonable and adaptable to the installation requirements of agricultural machinery oil tanks. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the assembly structure of the box cover and the exhaust seal in this utility model;

[0027] Figure 5 This is a schematic diagram of the dust filter assembly structure in this utility model;

[0028] In the diagram: 1. Rectangular box; 10. Air guide vertical pipe; 100. Annular mounting base; 11. Frame-shaped docking plate; 12. Partition plate; 13. Exhaust chamber; 14. Air inlet chamber; 15. L-shaped air guide pipe; 2. Box cover; 20. Exhaust port; 21. Air inlet; 3. Exhaust seal; 30. Cross-shaped fixing block; 31. First fixing pipe; 32. First spring; 33. First sliding rod; 34. First sealing plate; 35. First rubber pad; 4. Air inlet seal; 40. Second fixing pipe; 41. Second spring; 42. Second sliding rod; 43. Second sealing plate; 44. Second rubber pad; 5. Dust filter assembly; 50. External threaded fixing pipe; 51. Filter screen plate; 52. Outer pipe; 520. Air hole; 521. Annular positioning plate; 522. Rain cover. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Please see Figures 1-5 This utility model provides a technical solution:

[0032] The agricultural machinery oil tank pressure balance breather valve assembly includes a rectangular housing 1, which separates the airflow channels and houses the exhaust chamber 13, the intake chamber 14, and the air guide vertical pipe 10. Figure 1 and Figure 3As shown, a vertical air guide pipe 10 is provided through the bottom of the rectangular box 1 and near the left side. The vertical air guide pipe 10 is used to directly connect to the pressure balance hole of the oil tank and transmit gas. The rectangular box 1 is divided into an exhaust chamber 13 and an intake chamber 14 by a partition 12. The exhaust chamber 13 is used to temporarily store and guide the overpressure gas to be discharged. The intake chamber 14 is used to receive filtered outside air and introduce it into the oil tank. The exhaust chamber 13 is connected to the vertical air guide pipe 10. The intake chamber 14 is connected to the vertical air guide pipe 10 through an L-shaped air guide pipe 15.

[0033] The top of the rectangular box 1 is provided with a box cover 2, which is used to seal the rectangular box 1 and fix the dust filter assembly 5. The top of the box cover 2 is provided with an exhaust port 20 and an air inlet 21. The exhaust port 20 is used to discharge overpressure gas to the dust filter assembly 5, and the air inlet 21 is used to introduce filtered outside air. The exhaust port 20 is provided with an exhaust sealing element 3 for sealing the air guide vertical pipe 10. The exhaust sealing element 3 controls the opening and closing of the air guide vertical pipe 10 through air pressure to release overpressure gas. When the air pressure in the agricultural machinery oil tank increases, the internal air pressure pushes the first sealing plate 34 of the exhaust sealing element 3 to move upward, so that the top of the air guide vertical pipe 10 opens, allowing the air in the agricultural machinery oil tank to enter the exhaust chamber 13 from the air guide vertical pipe 10, then enter the external threaded fixed pipe 50 from the exhaust port 20, and finally be discharged to the outside from the air hole 520, so as to achieve pressure balance inside the agricultural machinery oil tank.

[0034] The air intake chamber 14 is equipped with an air intake seal 4 for sealing the air intake port 21. The air intake seal 4 controls the opening and closing of the air intake port 21 through negative pressure to prevent negative pressure in the oil tank. When the air pressure in the agricultural machinery oil tank decreases, in order to avoid negative pressure in the agricultural machinery oil tank, the outside air pushes the second sealing plate 43 of the air intake seal 4 to move downward, so that the air intake port 21 opens. The outside air passes through the air hole 520, the outer tube 52 and the external threaded fixing tube 50 of the dust filter assembly 5 in sequence, and enters the air intake chamber 14 through the air intake port 21. Then, it passes through the L-shaped air guide tube 15 and the air guide vertical tube 10 in sequence to enter the agricultural machinery oil tank, so as to achieve pressure balance inside the agricultural machinery oil tank.

[0035] Dust filter components 5 are provided on the top of the cover 2 and at the positions of the exhaust port 20 and the air inlet 21. The dust filter components 5 are used to filter particulate matter in the air and prevent rainwater from entering.

[0036] In this embodiment, as Figure 1 As shown, an annular mounting seat 100 is provided at the bottom of the outer wall of the air guide vertical pipe 10. The annular mounting seat 100 is installed on the outer wall of the agricultural machinery oil tank by bolts. The air guide vertical pipe 10 is connected to the pressure balance hole of the agricultural machinery oil tank.

[0037] Specifically, such as Figure 2 As shown, a frame-shaped connecting plate 11 is provided on the top of the outer wall of the rectangular box 1. The frame-shaped connecting plate 11 is connected to the box cover 2 by bolts and nuts.

[0038] Furthermore, in combination Figure 3 and Figure 4 As shown, the exhaust seal 3 includes a cross-shaped fixed block 30. The outer wall of the cross-shaped fixed block 30 is fixedly connected to the inner wall of the exhaust port 20, which can be fixed by adhesive. The cross-shaped fixed block 30 is used to fix the first fixed tube 31 and provide structural support. The bottom of the cross-shaped fixed block 30 is provided with the first fixed tube 31. The first fixed tube 31 is used to accommodate the first spring 32 and guide the movement of the first slide rod 33. The first spring 32 is provided inside the first fixed tube 31. The first spring 32 is used to provide the reset elastic force of the first sealing plate 34. The bottom end of the first spring 32 is provided with the first slide rod 33. The first slide rod 33 is used to connect the first spring 32 and the first sealing plate 34 to transmit the air pressure force. The bottom end of the first slide rod 33 is provided with the first sealing plate 34. The first sealing plate 34 is used to open the air guide vertical pipe 10 by being pushed by air pressure.

[0039] A first rubber pad 35 is bonded to the bottom of the first sealing plate 34. The bottom of the first rubber pad 35 is tightly fitted to the top of the air guide vertical pipe 10. The first rubber pad 35 is used to enhance the sealing of the top of the air guide vertical pipe 10.

[0040] Furthermore, in combination Figure 2 and Figure 3 As shown, the air intake seal 4 includes a second fixed tube 40 fixedly connected to the bottom of the inner wall of the air intake chamber 14. The second fixed tube 40 is used to accommodate the second spring 41 and guide the movement of the second slide rod 42. The second fixed tube 40 is provided with the second spring 41, which is used to provide the second sealing plate 43 with the return spring force. The top of the second spring 41 is provided with the second slide rod 42, which is used to connect the second spring 41 and the second sealing plate 43 to transmit the air pressure force. The top of the second slide rod 42 is provided with the second sealing plate 43, which is used to open the air intake port 21 when pushed by the external air pressure.

[0041] A second rubber pad 44 for sealing the air inlet 21 is bonded to the top of the second sealing plate 43. The top of the second rubber pad 44 is tightly fitted to the bottom of the cover 2. The second rubber pad 44 is used to enhance the sealing of the air inlet 21.

[0042] Furthermore, such as Figure 5As shown, the dust filter assembly 5 includes an externally threaded fixing tube 50 fixedly connected to the top of the cover 2, which can be fixed by adhesive bonding. The externally threaded fixing tube 50 is used to connect the outer tube 52 and fix the filter screen plate 51. The externally threaded fixing tubes 50 of the two dust filter assemblies 5 are respectively connected to the exhaust port 20 and the air inlet 21. The filter screen plate 51 is placed on the top of the externally threaded fixing tube 50. The filter screen plate 51 is used to intercept particulate matter in the air. The outer thread of the externally threaded fixing tube 50 is connected to the outer tube 52. The outer tube 52 is used to protect the filter screen plate 51 and form a gas channel. The inner wall of the outer tube 52 is provided with an annular positioning plate 521 for positioning the filter screen plate 51. The annular positioning plate 521 is used to prevent the filter screen plate 51 from shifting.

[0043] Multiple air holes 520 are provided on the outer wall of the outer tube 52 near the top. The air holes 520 are located above the annular positioning plate 521. A rain cover 522 is provided on the top of the outer tube 52 to prevent rainwater from directly entering the air holes 520.

[0044] In this embodiment, the pressure balance breather valve assembly for the agricultural machinery oil tank is used by first aligning the air guide vertical pipe 10 with the pressure balance hole on the outer wall of the agricultural machinery oil tank via the annular mounting base 100, and then fixing the annular mounting base 100 to the outer wall of the oil tank with bolts, so that the air guide vertical pipe 10 is connected to the inside of the oil tank; then aligning the box cover 2 with the rectangular box body 1 via the frame-shaped connecting plate 11, and locking it with bolts and nuts to ensure a sealed connection between the box cover 2 and the rectangular box body 1; when the air pressure inside the oil tank increases due to oil flow or temperature changes, the high-pressure gas pushes the first sealing plate 34 of the exhaust seal 3 to move upward against the elastic force of the first spring 32, so that the top of the air guide vertical pipe 10 opens, and the gas enters the exhaust chamber 13 through the air guide vertical pipe 10, flows into the external threaded fixing pipe 50 of the dust filter assembly 5 through the exhaust port 20, and then is discharged to the outside through the air hole 520 of the outer pipe 52, completing the overpressure release; during this process, the filter screen plate 51 of the dust filter assembly 5 intercepts external particles, and the rain cover 522 prevents rainwater from entering;

[0045] When negative pressure is generated inside the fuel tank, outside air enters the outer pipe 52 through the air hole 520 of the dust filter assembly 5. After being filtered by the external threaded fixed pipe 50 and the filter screen plate 51, it enters the intake chamber 14 from the air inlet 21, which pushes the second sealing plate 43 of the intake seal 4 to compress the second spring 41 and move it downward. The air is then introduced into the fuel tank through the L-shaped air guide pipe 15 and the air guide vertical pipe 10 to complete the negative pressure compensation.

[0046] During maintenance, the outer tube 52 can be disassembled to clean or replace the filter screen 51, or the internal seals can be inspected by loosening the bolts of the frame-shaped connecting plate 11. Throughout the process, the first rubber pad 35 and the second rubber pad 44 respectively enhance the sealing of the air guide vertical pipe 10 and the air inlet 21, and the airflow channels separated by the partition 12 ensure pressure regulation efficiency.

[0047] 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 preferred examples and are not intended to limit the 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. An agricultural machinery oil tank pressure balance breather valve assembly, comprising a rectangular housing (1), characterized in that: A vertical air duct (10) is provided through the bottom of the rectangular box (1) and near the left side. The rectangular box (1) is divided into an exhaust chamber (13) and an air inlet chamber (14) by a partition (12). The exhaust chamber (13) is connected to the vertical air duct (10). The air inlet chamber (14) is connected to the vertical air duct (10) through an L-shaped air duct (15). The top of the rectangular box (1) is provided with a box cover (2). The top of the box cover (2) is provided with an exhaust port (20) and an air inlet (21). An exhaust seal (3) is provided at the exhaust port (20) to seal the vertical air duct (10). An air inlet seal (4) is provided in the air inlet chamber (14) to seal the air inlet (21). A dust filter assembly (5) is provided at the top of the box cover (2) and at the positions of the exhaust port (20) and the air inlet (21).

2. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 1, characterized in that: The bottom of the outer wall of the air guide vertical pipe (10) is provided with an annular mounting seat (100), which is installed on the outer wall of the agricultural machinery oil tank by bolts. The air guide vertical pipe (10) is connected to the pressure balance hole of the agricultural machinery oil tank.

3. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 1, characterized in that: The top of the outer wall of the rectangular box (1) is provided with a frame-shaped connecting plate (11), which is connected to the box cover (2) by bolts and nuts.

4. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 1, characterized in that: The exhaust seal (3) includes a cross-shaped fixed block (30), the outer wall of which is fixedly connected to the inner wall of the exhaust port (20). The bottom of the cross-shaped fixed block (30) is provided with a first fixed tube (31), a first spring (32) is provided inside the first fixed tube (31), a first sliding rod (33) is provided at the bottom end of the first spring (32), and a first sealing plate (34) is provided at the bottom end of the first sliding rod (33).

5. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 4, characterized in that: The bottom of the first sealing plate (34) is bonded with a first rubber pad (35), and the bottom of the first rubber pad (35) is tightly fitted with the top of the air guide pipe (10).

6. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 1, characterized in that: The air intake seal (4) includes a second fixed tube (40) fixedly connected to the bottom of the inner wall of the air intake cavity (14), a second spring (41) is provided inside the second fixed tube (40), a second slide rod (42) is provided at the top of the second spring (41), and a second sealing plate (43) is provided at the top of the second slide rod (42).

7. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 6, characterized in that: The top of the second sealing plate (43) is bonded with a second rubber pad (44) for sealing the air inlet (21), and the top of the second rubber pad (44) is tightly fitted to the bottom of the box cover (2).

8. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 1, characterized in that: The dust filter assembly (5) includes an external threaded fixing tube (50) fixedly connected to the top of the cover (2). The two external threaded fixing tubes (50) of the dust filter assembly (5) are respectively connected to the exhaust port (20) and the air inlet (21). A filter screen plate (51) is placed on the top of the external threaded fixing tube (50). An outer tube (52) is threadedly connected to the outer side of the external threaded fixing tube (50). An annular positioning plate (521) for positioning the filter screen plate (51) is provided on the inner wall of the outer tube (52).

9. The agricultural machinery oil tank pressure balance breather valve assembly according to claim 8, characterized in that: The outer tube (52) has multiple air holes (520) on its outer wall near the top. The air holes (520) are located above the annular positioning plate (521). The top of the outer tube (52) is provided with a rain cover (522).

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