Plastic oil-proof breather valve

Abstract

The utility model relates to a plastic oil-proof ventilation valve which comprises a valve body, an inner hole of the valve body is divided into a first step hole and a second step hole, the first step hole and the second step hole are in transition through a wedge-shaped face, and an oil blocking part is integrally arranged in the first step hole and can enable most of splashed oil to flow back. At least two oil-proof filter elements are arranged in the second stepped hole, and a plurality of oil collecting holes are formed in the oil-proof filter elements, so that oil molecules with large diameters can be blocked by the oil-proof filter elements and can more smoothly flow back into an oil tank from top to bottom through wedge-shaped surfaces; during installation, the oil collecting holes in the two oil-proof filter elements are arranged in a staggered manner, so that direct impact of oil on the breathable film is prevented; a membrane seat is tightly matched in the second step hole, a breathable membrane is arranged between the oil-proof filter element and the membrane seat, and a dustproof cover is arranged on the membrane seat. Oil molecules with small diameters can be blocked by the breathable film, air can freely pass through the breathable film, and therefore air pressure balance of the inner side and the outer side of the oil tank is kept.

Description

Technical Field

[0001] This utility model relates to the field of manufacturing technology of breathable valves, and in particular to a plastic oil-proof breathable valve. Background Technology

[0002] With the continuous advancement of automotive technology, the working environment of key components such as car engines and transmissions has become more complex. For example, in high-performance engines, the operating temperature and pressure range of lubricating oil is constantly expanding. To ensure the normal operation of these components and prevent lubricating oil leakage and the ingress of external impurities, it is also necessary to maintain the internal pressure balance of the components. This has led to the development of plastic oil-proof breather valve technology.

[0003] The trend towards miniaturization and integration of automotive parts has led to more compact interior spaces. Components like the differential in automobiles require good heat dissipation and pressure balance within a limited space, which traditional sealing methods cannot meet. Simply sealing can cause internal heat buildup, increased pressure, and ultimately, seal failure and lubricant leakage.

[0004] Especially in the engine crankcase ventilation system, the oil vent valve plays a crucial role. When the engine is running, high temperatures and pressure changes occur within the crankcase, and lubricating oil mist is present. The oil vent valve can expel exhaust gases from the crankcase while preventing lubricating oil leakage. Without effective oil venting measures, lubricating oil can be drawn into the intake system, leading to incomplete combustion and carbon buildup in the engine.

[0005] In both automatic and manual transmissions, the oil vent valve balances internal pressure. When the transmission is operating, the oil temperature rises, increasing internal pressure. The oil vent valve releases hot air while preventing transmission fluid leakage, ensuring the normal operation and lifespan of the transmission. For example, in dual-clutch transmissions, where the operating environment is more complex, the oil vent valve effectively handles the pressure changes and fluid fluctuations that occur during frequent gear shifts.

[0006] Chinese patent CN110345287A, entitled "A Novel Oil-Proof and Breathable Balance Valve," discloses "

[0020] such as..." Figure 3 or Figure 4 As shown, the straight vent 14 has at least two steps 17, which are staggered and maintain a certain distance. The steps are set to half the size of the straight vent and are staggered. After the oil-proof vent balance valve is connected to the oil tank, if vibration or bumps occur, the staggered arrangement of the multiple steps can effectively prevent oil from seeping into the valve body or the oil-proof vent membrane, thus avoiding oil leakage. "

[0021] As Figure 4As shown, the bottom of the receiving cavity 13 is provided with several ribs 18, and the ribs 18 form inclined gaps 19 that slope towards the straight vent 14. These ribs reduce the contact area between the filter block and the valve body receiving cavity, effectively reducing oil seepage into the valve body during vibration or bumps. Furthermore, the oil can flow through the inclined gaps to the oil tank via the straight vent, thus reducing oil leakage. This technical solution aims to reduce or prevent oil leakage.

[0007] However, this type of valve body integrates at least two layers of steps 17, several ribs 18 and other complex technical features on a single part, which makes manufacturing difficult. Summary of the Invention

[0008] The purpose of this invention is to provide a plastic oil-proof and breathable valve to solve the problems mentioned in the background art.

[0009] To solve the above-mentioned technical problems, this utility model is achieved through the following technical measures: a plastic oil-proof and breathable valve, characterized in that: it includes a hollow, bolt-shaped valve body, the inner hole of the valve body is divided into a first stepped hole and a second stepped hole, the first stepped hole and the second stepped hole are transitioned by a wedge-shaped surface, an oil-blocking part is integrally provided in the first stepped hole, at least two oil-proof filter elements are provided in the second stepped hole, the oil-proof filter elements are provided with a plurality of oil collecting holes, and during installation, the oil collecting holes on the two oil-proof filter elements are staggered; a diaphragm seat is tightly fitted in the second stepped hole, a breathable membrane is provided between the oil-proof filter element and the diaphragm seat, and a dust cover is provided on the diaphragm seat.

[0010] Compared with existing technologies, the advantages of this invention are as follows: An oil-blocking part is integrally set in the first stepped hole of the valve body, allowing most of the splashed oil to flow back; large-diameter oil molecules are blocked by the oil-proof filter element, and the wedge-shaped surface between the first and second stepped holes allows oil droplets to flow back into the oil tank more smoothly from top to bottom due to gravity; the staggered arrangement of oil collection holes on the two oil-proof filters prevents oil from directly impacting the venting membrane; small-diameter oil molecules are blocked by the venting membrane, while air can freely pass through, thus maintaining the air pressure balance inside and outside the oil tank. This novel valve body structure has simple technical features and is easy to manufacture.

[0011] As an improvement to this utility model, the valve body is provided with an external thread, and the valve body is provided with a sealing groove for placing a sealing ring, the groove being located at the root of the external thread. The purpose of this design is:

[0012] The sealing ring can achieve a more effective sealing effect.

[0013] As an improvement of this utility model, the outer ring of the oil-blocking part is evenly distributed with four air inlet gaps. The purpose of this design is that the air inlet gaps allow the mixture of oil and gas to pass through these four small gaps, allowing pure air to communicate with the outside, thereby maintaining the balance of internal and external pressure.

[0014] As an improvement of this utility model, the valve body is made of PA66+25%GF. The purpose of this design is to provide better strength, rigidity, and wear resistance; better resistance to bending, compression, and torsion; the ability to withstand greater external forces without easily deforming; better heat resistance and strong thermal stability; the ability to withstand temperatures of 200℃ or even higher; and the resistance to deformation, softening, or embrittlement, thus meeting the requirements for applications under certain high-temperature conditions.

[0015] As an improvement to this utility model, cross-shaped ribs are evenly distributed on the wedge-shaped surface. The purpose of selecting this design is:

[0016] This increases the strength of the wedge-shaped surface.

[0017] As an improvement of this utility model, the diaphragm holder is provided with a cross-shaped support surface. The purpose of this design is to flatly press the breathable membrane and prevent it from bending. Attached Figure Description

[0018] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] In the attached diagram:

[0020] Figure 1 This is an exploded view of the plastic oil-proof and breathable valve described in this utility model.

[0021] Figure 2 This is a cross-sectional view of the plastic oil-proof and breathable valve described in this utility model.

[0022] Figure 3 This is a perspective view of the valve body described in this utility model.

[0023] Figure 4 These are six views of the valve body described in this utility model.

[0024] Figure 5 This is a cross-sectional view of the valve body described in this utility model.

[0025] Figure 6 This is a perspective view of the oil-proof filter element described in this utility model.

[0026] Figure 7 This is a perspective view of the diaphragm holder described in this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. First step hole; 3. Second step hole; 4. Wedge-shaped surface; 5. Oil blocking part; 6. Oil-proof filter element; 7. Oil collection hole; 8. Diaphragm seat; 9. Breathable membrane; 10. Dust cover; 11. External thread; 12. Sealing groove; 13. Air inlet gap; 14. Cross rib; 15. Cross-shaped support surface; 16. Sealing ring; 17. Major diameter of thread. Detailed Implementation

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] Example 1

[0030] Please refer to Figure 1 -7.

[0031] This embodiment provides a plastic oil-proof and breathable valve, comprising a hollow, bolt-shaped valve body 1, the valve body 1 being made of PA66+25%GF. This material possesses good strength, rigidity, and wear resistance; it exhibits better resistance to bending, compression, and torsion; it can withstand greater external forces and is not easily deformed; it has good heat resistance and strong thermal stability, capable of withstanding temperatures of 200℃ or even higher; it is not easily deformed, softened, or embrittled, meeting the requirements for some high-temperature applications; it has excellent electrical insulation, maintaining high volume resistivity and breakdown voltage; it has good chemical corrosion resistance, is not prone to chemical reactions, and can be used in harsh environments; it has good dimensional stability, significantly reducing product shrinkage during injection molding; it has good flowability, giving it good processing performance; it has good surface quality, meeting the requirements of applications with high appearance standards; and among plastic parts, it has a relatively high density, ensuring a certain strength, while being lower in density and lighter in weight compared to metal parts.

[0032] In the embodiments of this utility model application, please refer to Figure 5 The inner hole of the valve body 1 is divided into a first stepped hole 2 and a second stepped hole 3. The first stepped hole 2 and the second stepped hole 3 are connected by a wedge-shaped surface 4. Cross ribs 14 are evenly distributed on the wedge-shaped surface 4 to increase the strength of the wedge-shaped surface 4.

[0033] Furthermore, the valve body 1 is provided with an external thread 11, and the valve body 1 is provided with a sealing groove 12 for placing a sealing ring 16, which is located at the starting root of the external thread 11. The sealing ring 16 can play a more effective sealing role.

[0034] Furthermore, the major diameter 17 of the mounting thread of valve body 1 is increased to M16X1.5, which improves the tightening torque and ultimate torque value.

[0035] In the embodiments of this utility model application, please refer to Figure 3 An oil-blocking part 5 is integrally formed inside the first stepped hole 2, and four air inlet gaps 13 are evenly distributed on the outer ring of the oil-blocking part 5. The air inlet gaps 13 allow the mixture of oil and gas to pass through these four small gaps, allowing pure air to communicate with the outside, thereby maintaining the balance of internal and external pressure.

[0036] In the embodiments of this utility model application, please refer to Figure 1 and Figure 2 The second step hole 3 is provided with three oil-proof filter elements 6. Each oil-proof filter element 6 is provided with a plurality of oil collection holes 7. During installation, the oil collection holes 7 on the three oil-proof filter elements 6 are staggered with each other.

[0037] In the embodiments of this utility model application, please refer to Figure 7 A diaphragm seat 8 is tightly fitted inside the second stepped hole 3. A breathable membrane 9 is disposed between the oil-proof filter element 6 and the diaphragm seat 8. A dust cover 10 is provided on the diaphragm seat 8. Furthermore, a cross-shaped support surface 15 is provided on the diaphragm seat 8. This structure can flatly press the breathable membrane 9 and prevent the breathable membrane 9 from bending.

[0038] This embodiment provides a plastic oil-proof and breathable valve, which is connected as follows: three oil-proof filter elements 6 are placed into the inner hole of the valve body 1 at once, and need to be placed flat; the rough surface of the breathable membrane 9 is placed on the upper surface of the countersunk hole of the diaphragm seat 8 with the membrane facing outward, and needs to be placed flat; the diaphragm seat 8 after the membrane is placed is subjected to secondary injection molding to become the diaphragm seat 8 assembly (diaphragm seat 8 + breathable membrane 9); the lower half of the groove of the diaphragm seat 8 assembly is fitted with the valve body 1 and pressed into place, and then ultrasonic welding is performed; the dust cover 10 is assembled with the diaphragm seat 8, and the positioning points need to be aligned, and then ultrasonic welding is performed; the sealing ring 16 is fitted into the sealing groove 12 of the valve body 1 and installed in place.

[0039] The beneficial effects of this utility model are as follows: The valve body 1 is made of PA66+25%GF material, which greatly increases the overall strength of the product, making the valve body 1 less prone to breakage under stress, and giving the product good chemical resistance, heat resistance and good appearance; the major diameter of the thread 17 of the valve body 1 is increased to M16X1.5, which improves the tightening torque and ultimate torque value; the diaphragm inside the entire part adopts a secondary injection molding assembly method, which gives the product good sealing performance; the entire part is equipped with three oil-proof filter elements 6, which can not only meet the requirements of dust and water protection, but also effectively block oil and gas and prevent oil and gas from overflowing from the product.

[0040] An oil-blocking part 5 is integrally set in the first stepped hole 2 of the valve body 1, which allows most of the splashed oil to flow back; large-diameter oil molecules can be blocked by the oil-proof filter element 6, and the wedge-shaped surface 4 between the first stepped hole 2 and the second stepped hole 3 allows oil droplets to flow back into the oil tank more smoothly from top to bottom by gravity; the oil collecting holes 7 on the two oil-proof filter elements 6 are staggered to prevent oil from directly impacting the vent membrane 9; small-diameter oil molecules can be blocked by the vent membrane 9, and air can pass freely through the vent membrane 9, thereby maintaining the air pressure balance inside and outside the oil tank. The valve body 1 with this novel structure has simple technical features and is easy to manufacture.

[0041] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A plastic oil-proof and breathable valve, characterized in that: The valve body (1) is hollow and bolt-shaped. The inner hole of the valve body (1) is divided into a first stepped hole (2) and a second stepped hole (3). The first stepped hole (2) and the second stepped hole (3) are connected by a wedge-shaped surface (4). An oil-blocking part (5) is integrally provided in the first stepped hole (2). At least two oil-proof filter elements (6) are provided in the second stepped hole (3). Several oil collection holes (7) are provided on the oil-proof filter elements (6). During installation, the oil collection holes (7) on the two oil-proof filter elements (6) are staggered. A diaphragm seat (8) is tightly fitted in the second stepped hole (3). A breathable membrane (9) is provided between the oil-proof filter element (6) and the diaphragm seat (8). A dust cover (10) is provided on the diaphragm seat (8).

2. The plastic oil-proof and breathable valve according to claim 1, characterized in that: The valve body (1) is provided with an external thread (11) and a sealing groove (12) for placing a sealing ring (16) is provided on the valve body (1), the position of which is located at the starting root of the external thread (11).

3. The plastic oil-proof and breathable valve according to claim 1, characterized in that: The outer ring of the oil-blocking part (5) has four air intake gaps (13) evenly distributed.

4. The plastic oil-proof and breathable valve according to claim 1, characterized in that: The valve body (1) is made of PA66+25%GF.

5. The plastic oil-proof and breathable valve according to claim 1, characterized in that: Cross-shaped ribs (14) are evenly distributed on the wedge-shaped surface (4).

6. The plastic oil-proof and breathable valve according to claim 1, characterized in that: The diaphragm seat (8) is provided with a cross-shaped support surface (15).

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