Oil return one-way valve of crankcase ventilation system

Abstract

The utility model relates to an oil return one-way valve of a crankcase ventilation system, which comprises a valve casing and a valve seat, the inside of the valve casing is communicated with the inside of the valve seat, the valve casing comprises a first valve casing and a second valve casing which are in assembled connection, the second valve casing is movably connected with the valve seat, a valve cavity is arranged in the valve casing, a diaphragm is arranged in the valve cavity, and the diaphragm is arranged in the valve casing. The second valve shell is used for blocking fluid when being attached to the first valve shell in a sealed mode, and supporting ribs are arranged in the second valve shell and used for forming a flow channel for the fluid to pass through. The diaphragm type one-way valve core is adopted, so that the diaphragm can freely move in the valve cavity, the position of the diaphragm is continuously changed in the closing process each time to be in contact with the first valve shell, the stress positions of the surface of the diaphragm and the contact surface of the second valve shell are different when the diaphragm is closed each time, and therefore deformation caused by local continuous stress cannot be caused; the service life of the diaphragm is effectively prolonged, opening is kept through the dead weight of the diaphragm and the dead weight of engine oil, and backflow smoothness can be improved when blow-by pressure is small.

Description

Technical Field

[0001] The utility model belongs to the field of oil return one-way valves, in particular to an oil return one-way valve for a crankcase ventilation system. Background Art

[0002] When the engine is working, some exhaust gas will leak from the piston ring of the combustion chamber into the engine crankcase. These exhaust gases mix with the oil particles inside the engine to form crankcase blowby. An oil-gas separator is generally provided on the engine to separate the oil from the crankcase blowby. The separated oil needs to flow back to the crankcase through the return oil channel, so the inlet side of the return oil channel is connected to the inner cavity of the oil-gas separator, and the other side is connected to the engine crankcase. In order to prevent the crankcase blowby from being discharged to the outside from the return oil channel without oil and gas separation, a return oil check valve is provided.

[0003] The existing oil return check valve partially adopts a spring-type check valve, and an elastic diaphragm-type check valve is also adopted in an application environment with a compact structure. However, both of the above valves are kept normally closed by elastic components, which increases the difficulty of oil return. Conventional diaphragm-type check valves, because the diaphragm is generally in a semi-fixed state and is opened and closed by elastic deformation, the force-bearing part is relatively fixed when closed, which can easily cause deformation of the seal under pressure difference, affecting the sealing performance. Utility Model Content

[0004] The purpose of the present utility model is to provide an oil return check valve for a crankcase ventilation system in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A crankcase ventilation system oil return one-way valve includes a valve housing and a valve seat, the valve housing and the valve seat are internally connected, the valve housing includes a first valve housing and a second valve housing that are assembled together, the second valve housing is movably connected to the valve seat, a valve cavity is provided in the valve housing, a diaphragm is provided in the valve cavity, which is used to block the fluid when it is sealed with the first valve housing, and a supporting rib is provided in the second valve housing, which is used to form a flow channel for fluid to pass through.

[0007] As a further optimization scheme of the present invention, a first return hole connected to the valve cavity is provided on the first valve housing, and a second return hole connected to the valve cavity is provided on the second valve housing, wherein a sealing rib is provided on the surface of the first valve housing around the first return hole. By providing the sealing rib, the local force on the diaphragm can be increased to improve the sealing performance. The area of the first return hole is smaller than the sealing rib, and the diameter of the sealing rib is smaller than the diameter of the diaphragm, and the gap width between the sealing rib and the side wall of the valve cavity is at least twice the width of the gap between the diaphragm and the valve cavity, so that when the diaphragm freely moves in the valve cavity, even if the diaphragm contacts the side wall of the valve cavity, it can still completely cover the sealing rib.

[0008] As a further optimization solution of the present invention, the sealing rib is a circular protrusion that is continuous around the first return hole. By providing the circular sealing rib, the fitting effect with the diaphragm can be further enhanced.

[0009] As a further optimization scheme of the present invention, the cross-section of the sealing rib is semicircular. When the diaphragm is in contact with the sealing rib, a small local deformation is required to achieve a higher sealing performance. In order to make the contact surface between the diaphragm and the sealing rib continuous, a sealing rib with a semicircular cross-section is provided so that the contact surface is continuous and seamless, thereby improving the sealing effect.

[0010] As a further optimization scheme of the present invention, a slope is provided on the surface of the second valve housing around the second return hole. After the engine oil enters the valve cavity, it flows downward from the four sides of the diaphragm. In order to facilitate the engine oil to converge into the second return hole, an inwardly concave slope is provided to facilitate the return of the engine oil.

[0011] As a further optimization scheme of the present invention, the second valve housing and the first valve housing both have an extension portion, and the extension portion is nested inside and outside to form a valve cavity. This scheme forms an inside-outside nested assembly effect by setting the assembly method of the first valve housing and the second valve housing, and this assembly method is conducive to sealing.

[0012] As a further optimized solution of the present invention, the movable connection between the valve seat and the second valve housing is a threaded connection.

[0013] As a further optimization solution of the present invention, a sealing ring is further provided at the fitting position of the internally threaded sleeve and the externally threaded barrel to improve the sealing effect of the threaded connection.

[0014] As a further optimization solution of the present invention, the outer circumferential surfaces of the second valve housing and the valve seat are both provided with flat surfaces for easy screwing, so as to facilitate removal of the second valve housing from the valve seat for easy inspection and replacement.

[0015] The beneficial effects of the present invention are:

[0016] The utility model adopts a diaphragm-type one-way valve core, which allows the diaphragm to move freely in the valve cavity. It continuously changes its position to contact the first valve housing during each closing process. Each time the diaphragm is closed, the force position of the contact surface between its surface and the second valve housing is different, so it will not cause local continuous force and deformation, effectively improving the service life of the diaphragm. It is kept open by the deadweight of the diaphragm and the deadweight of the engine oil, which can improve the smoothness of the backflow when the blowby pressure is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2It is a schematic diagram of the cross-sectional structure of the present utility model.

[0019] Figure 3 This utility model Figure 2 A magnified view of the structure of part A.

[0020] In the figure: 1. first valve housing; 11. first return hole; 12. sealing rib; 13. valve chamber; 2. second valve housing; 21. second return hole; 22. supporting rib; 3. valve seat; 4. diaphragm; 5. sealing ring. DETAILED DESCRIPTION

[0021] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example 1

[0023] like Figure 1-3 As shown, a crankcase ventilation system oil return one-way valve includes a valve housing and a valve seat 3. The valve housing and the valve seat 3 are internally connected. The valve housing includes a first valve housing 1 and a second valve housing 2 that are assembled and connected. The second valve housing 2 is movably connected to the valve seat 3. A valve cavity 13 is provided in the valve housing. A diaphragm 4 is provided in the valve cavity 13 for blocking the fluid when sealingly fitted with the first valve housing 1. Support ribs 22 are provided in the second valve housing 2 for forming a flow channel for fluid to pass through.

[0024] In this solution, the diaphragm 4 is disc-shaped, and the side wall of the valve cavity 13 is also cylindrical. By adopting a diaphragm 4-type one-way valve core, the diaphragm 4 can move freely in the valve cavity 13. It continuously changes its position and contacts the first valve housing 1 during each closing process. Each time the diaphragm 4 is closed, the force position of the contact surface between its surface and the second valve housing 1 is different, so it will not cause local continuous force and deformation, effectively improving the service life of the diaphragm, and it is kept open by the weight of the diaphragm and the weight of the engine oil, which can improve the smoothness of the reflux when the blowby pressure is relatively low.

[0025] The first valve housing 1 is provided with a first return hole 11 connected to the valve chamber 13, and the second valve housing 2 is provided with a second return hole 21 connected to the valve chamber 13, wherein a sealing rib 12 is provided on the surface of the first valve housing 1 around the first return hole 11. By providing the sealing rib 12, the local force on the diaphragm 4 can be increased to improve the sealing performance. The area of the first return hole 11 is smaller than the sealing rib 12, and the diameter of the sealing rib 12 is smaller than the diameter of the diaphragm 4, and the gap width between the sealing rib 12 and the side wall of the valve chamber 13 is at least twice the width of the gap between the diaphragm 4 and the valve chamber 13, so that when the diaphragm 4 freely moves in the valve chamber 13, even if the diaphragm 4 contacts the side wall of the valve chamber 13, it can still completely cover the sealing rib 12.

[0026] Furthermore, in order to improve the contact effect between the sealing rib 12 and the diaphragm 4, the sealing rib 12 is a continuous circular protrusion surrounding the first return hole 11, and the cross-section of the sealing rib 12 is semicircular. When the diaphragm 4 is in contact with the sealing rib 12, it requires local slight deformation to have a higher sealing performance. In order to make the contact surface between the diaphragm 4 and the sealing rib 12 continuous, a sealing rib 12 with a semicircular cross-section is provided so that the contact surface is continuous and seamless, thereby improving the sealing effect.

[0027] Furthermore, in order to improve the oil reflux effect, a slope is provided on the surface of the second valve housing 2 around the second reflux hole 21. After the oil enters the valve chamber 13, it flows downward from the four sides of the diaphragm 4. In order to facilitate the oil to converge into the second reflux hole 21, an inwardly concave slope is provided to facilitate the oil reflux.

[0028] The second valve housing 2 and the first valve housing 1 both have an extension portion, which is nested inside and outside to form a valve cavity 13. The nested assembly effect is conducive to sealing. Specifically, as shown in the figure, the first valve housing 1 extends out of the inner cylinder, and the second valve housing 2 extends out of the outer cylinder. The inner and outer cylinders are nested with each other, and the two can be sealed by welding, bonding, etc., or sealed by threads.

[0029] The valve seat 3 and the second valve housing 2 are movably connected via a threaded connection. The valve seat 3 includes an internally threaded sleeve. The second valve housing 2 extends an externally threaded sleeve in a direction away from the valve cavity 13, which threads into the internally threaded sleeve. A sealing ring 5 is also provided at the interface between the internally threaded sleeve and the externally threaded sleeve. The outer circumferences of both the second valve housing 2 and the valve seat 3 are provided with flat surfaces for easy threading. The valve seat allows the externally threaded sleeve of the second valve housing 2 to threadably engage the internally threaded sleeve of the valve seat 3, facilitating installation of the first and second valve housings 1 and 2.

[0030] The specific implementation method is as follows: when the blow-by gas pressure in the crankcase increases, the diaphragm 4 is pushed upward to fit the sealing rib 12 to prevent the blow-by gas from being directly discharged into the atmosphere; after the crankcase blow-by gas is separated from the oil and gas, the separated engine oil enters the first valve housing 1. When the accumulated engine oil level reaches a certain level, the pressure of the engine oil acting on the diaphragm is greater than the pressure difference at both ends of the diaphragm, the diaphragm opens, and the engine oil then flows into the valve cavity 13 through the first reflux hole 11, flows into the second reflux hole 21 through the gap between the support ribs 22, and flows back to the crankcase.

[0031] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A crankcase ventilation system oil return check valve, comprising a valve housing and a valve seat (3), wherein the interiors of the valve housing and the valve seat (3) are in communication, and wherein: The valve housing comprises a first valve housing (1) and a second valve housing (2) which are assembled and connected. The second valve housing (2) is movably connected to the valve seat (3). A valve cavity (13) is provided in the valve housing. A diaphragm (4) is provided in the valve cavity (13) for blocking the fluid when sealingly fitted with the first valve housing (1). Support ribs (22) are provided in the second valve housing (2) for forming a flow channel for the fluid to pass through.

2. The oil return check valve for a crankcase ventilation system according to claim 1, characterized in that: The first valve housing (1) is provided with a first return hole (11) communicating with the valve cavity (13), and the second valve housing (2) is provided with a second return hole (21) communicating with the valve cavity (13), wherein a sealing rib (12) is provided on the surface of the first valve housing (1) around the first return hole (11).

3. The crankcase ventilation system oil return check valve according to claim 2, characterized in that: The sealing rib (12) is a circular protrusion that is continuous and surrounds the first reflow hole (11).

4. The crankcase ventilation system oil return check valve according to claim 3, characterized in that: The cross section of the sealing rib (12) is semicircular.

5. The crankcase ventilation system oil return check valve according to claim 2, characterized in that: The surface of the second valve housing (2) is provided with a slope surface around the second return hole (21).

6. The crankcase ventilation system oil return check valve according to claim 1, characterized in that: The second valve housing (2) and the first valve housing (1) both have an extension portion, and the extension portion is nested and assembled inside and outside to form a valve cavity (13).

7. The crankcase ventilation system oil return check valve according to claim 1, characterized in that: The movable connection between the valve seat (3) and the second valve housing (2) is a threaded connection.

8. The crankcase ventilation system oil return check valve according to claim 7, characterized in that: A sealing ring (5) is also provided at the fitting position between the valve seat (3) and the second valve housing (2).

9. The oil return check valve for a crankcase ventilation system according to claim 7, characterized in that: The outer circumferential surfaces of the second valve housing (2) and the valve seat (3) are both provided with flat surfaces for easy screwing.

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