A line contact check valve

Abstract

The present invention relates to a line contact one-way valve, in particular to a line contact one-way valve that fixes a valve plate through a baffle structure with a through hole, which can be applied to a line contact one-way valve of an engine breathing system. Since a through hole structure is provided on the baffle that fixes the valve plate, the suction resistance of the valve plate when it is separated from the baffle when the one-way valve is closed is reduced, thereby improving the stability of the one-way valve. In addition, the smaller contact area of ​​the line contact reduces the adhesion of the oil at the contact point of the valve plate due to viscosity, and the adhesion resistance of the valve plate when opening the one-way valve is smaller. The small movement resistance and small movement stroke of the valve plate enable the one-way valve to quickly switch between opening and closing, thereby making the one-way valve have higher sensitivity.

Description

Technical Field

[0001] The invention relates to a line contact type one-way valve, in particular to a line contact type one-way valve applied to an engine breathing system. Background Art

[0002] The crankcase breathing system of the engine introduces the oil vapor in the crankcase from the engine intake duct into the engine combustion chamber and burns it to prevent the oil vapor in the crankcase from overflowing and polluting the environment. The oil vapor separator of the traditional engine crankcase breathing system cannot filter the oil particles thoroughly. The oil particles in the oil vapor will gather into oil in the breathing pipe and flow into the engine combustion chamber, resulting in poor combustion of the engine lubricating oil and the generation of pollutant exhaust gas, which deteriorates the environmental emission performance of the engine. Therefore, it is necessary to lead the oil in the breathing pipe back to the crankcase of the engine. Technicians in this field often set a one-way valve to control the oil in the breathing pipe to flow back to the crankcase in one direction to prevent the oil vapor in the crankcase from overflowing. However, the high-speed operation of the engine causes the pressure in the crankcase to change rapidly, and sometimes it is greater than the pressure outside the crankcase and sometimes it is less than the pressure outside the crankcase. Therefore, the one-way valve needs to be sensitive enough, have a certain stability, and be easy to assemble and disassemble. Summary of the invention

[0003] In view of the above circumstances, the present invention is intended to provide a line-contact one-way valve with high sensitivity, good stability and easy assembly and disassembly.

[0004] The present invention discloses a one-way valve, characterized in that:

[0005] Including valve seat, valve plate and baffle;

[0006] The valve plate is arranged between the valve seat and the baffle to realize the opening and closing of the one-way valve;

[0007] The baffle is provided with a plurality of baffle through holes communicating with the front and rear end surfaces of the baffle, wherein the baffle through holes reduce the suction resistance of the valve plate when the valve plate is separated from the baffle when the one-way valve is closed;

[0008] The valve seat has a large total length of sealing band, and the valve disc can obtain a sufficiently large flow cross section in the sealing band section by opening a small opening.

[0009] When the one-way valve is closed, the contact between the valve disc and the valve seat is in line contact.

[0010] When the one-way valve is open, the contact between the valve plate and the baffle is also in a line contact state;

[0011] The smaller contact area of ​​the line contact makes the adhesion of the oil due to viscosity at the contact point of the valve plate smaller, and the valve plate has smaller adhesion resistance when opening the one-way valve. The small movement resistance and small movement stroke of the valve plate enable the one-way valve to quickly switch between opening and closing, thereby achieving high sensitivity of the one-way valve.

[0012] Preferably,

[0013] The top of the valve seat is provided with an inlet countersunk hole, the bottom is provided with an outlet countersunk hole, the bottom surface of the outlet countersunk hole is provided with an inner sealing boss and an outer sealing boss with concentric circles, a valve plate limiting boss is provided between the inner sealing boss and the outer sealing boss, and a plurality of flow holes are provided between the inlet countersunk hole and the outlet countersunk hole of the valve seat;

[0014] A circle of outer edge bosses is arranged at the outer edge of the front end surface of the baffle.

[0015] Preferably,

[0016] The top end surface of the inner sealing boss, the top end surface of the outer sealing boss, the top end surface of the valve plate limiting boss and the top end surface of the outer edge boss on the valve seat are all curved surfaces, and the one-way valve has a larger total sealing belt length through the inner sealing boss and the outer sealing boss;

[0017] When the one-way valve is closed, the contact between the valve disc and the top end face of the inner sealing boss on the valve seat, the top end face of the outer sealing boss and the top end face of the valve disc limiting boss is in a line contact state.

[0018] When the one-way valve is opened, the contact between the valve plate and the top end surface of the outer edge boss is also in a line contact state.

[0019] Preferably,

[0020] A central through hole is arranged at the center of the valve plate, and a plurality of convex teeth are arranged on the edge of the central through hole.

[0021] Preferably,

[0022] The valve seat is provided with a tubular column, the inner circle of the tubular column is provided with a valve seat through hole, the outer circle is provided with an annular groove, and the valve plate is sleeved on the outer circle of the tubular column;

[0023] An axial through hole is provided at the center of the baffle, and a chamfer is provided at the rear end opening of the axial through hole;

[0024] The baffle is installed in the annular groove, the edge of the bottom surface of the annular groove is buckled on the chamfered conical surface of the rear end opening of the axial through hole, and the front end surface of the baffle is pressed against the top surface of the annular groove.

[0025] Preferably,

[0026] A pit is arranged inside the inner sealing boss, and the tubular column extends axially from the bottom surface of the pit.

[0027] Preferably,

[0028] A gap is provided between the top of the valve plate limiting boss and the plane where the tops of the inner sealing boss and the outer sealing boss are located.

[0029] Preferably,

[0030] There is a gap between the top end of the outer edge boss and the rear end surface of the valve plate when the one-way valve is in a closed state.

[0031] Preferably,

[0032] A plurality of transverse through holes are arranged on the skirt of the valve seat.

[0033] Preferably,

[0034] An outer annular groove is arranged on the outer circle of the valve seat, a sealing ring is arranged in the outer annular groove, and a longitudinal groove is arranged on the axis of the tubular column.

[0035] The present invention has the following benefits:

[0036] The present invention is directed to an engine crankcase provided with a line contact check valve, which belongs to a line contact check valve that fixes a valve plate through a baffle structure with a through hole, and can be applied to a line contact check valve of an engine breathing system. Since a through hole structure is provided on the baffle that fixes the valve plate, the suction resistance of the valve plate when the one-way valve is closed is reduced, thereby improving the stability of the one-way valve.

[0037] By utilizing the rapid change of the pressure in the crankcase between positive pressure and negative pressure when the engine is running at high speed, the valve plate is fixed by a simple snap-fit ​​structure between the baffle and the valve seat, and the one-way valve is opened and closed by the valve plate. The valve seat involved in the present invention has a large total length of the sealing band, and a sufficiently large flow cross-section can be obtained in the sealing band section by opening the valve plate at a small opening. The small contact area of ​​the line contact makes the adhesion of the oil at the contact point of the valve plate due to viscosity smaller, and the adhesion resistance of the valve plate is smaller when the one-way valve is opened. The small movement resistance of the valve plate and the small movement stroke make the one-way valve quickly switch between opening and closing, so that the one-way valve has a higher sensitivity.

[0038] The descriptions of directions such as “upper”, “lower”, “top” and “bottom” in this specification refer to the directions of the structures in the drawings, and the same shall apply hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a cross-sectional view of the one-way valve structure of the present invention;

[0041] Figure 2 is a view of the valve seat of the present invention;

[0042] Figure 3 It is a view of the valve plate of the present invention;

[0043] Figures 4 to 6 They are Figures 1 to 3 3D schematic diagram of the . DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "parallel", "vertical" and the like appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0049] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0050] The present invention will be further described below in conjunction with the accompanying drawings:

[0051] In one embodiment,

[0052] The present invention discloses a line contact one-way valve, which is characterized by:

[0053] It comprises a valve seat (1), a valve plate (2) and a baffle (3); the valve plate (2) is arranged between the valve seat (1) and the baffle (3) to realize the opening and closing of the one-way valve;

[0054] The baffle plate (3) is provided with a plurality of baffle plate through holes (3-3) communicating with the front and rear end surfaces of the baffle plate (3), wherein the baffle plate through holes (3-3) reduce the suction resistance of the valve plate (2) when it separates from the baffle plate (3) when the one-way valve is closed;

[0055] The valve seat (1) has a relatively large total length of the sealing band, and the valve plate (2) can obtain a sufficiently large flow cross section in the sealing band section by opening the valve plate (2) to a relatively small degree. When the one-way valve is closed, the contact between the valve plate (2) and the valve seat (1) is in a line contact state, and when the one-way valve is opened, the contact between the valve plate (2) and the baffle (3) is also in a line contact state.

[0056] The smaller contact area of ​​the line contact means that the adhesion of the oil at the contact point with the valve plate (2) due to viscosity is smaller, and the adhesion resistance of the valve plate (2) is smaller when the one-way valve is opened. The small movement resistance and small movement stroke of the valve plate (2) allow the one-way valve to quickly switch between opening and closing, thereby achieving high sensitivity of the one-way valve.

[0057] Through the above-mentioned embodiments, the valve seat of the line contact one-way valve has a large total length of the sealing band, and the valve disc can obtain a sufficiently large flow cross section in the sealing band section by opening the valve disc to a small degree. The smaller contact area of ​​the line contact makes the adhesion of the oil at the contact point of the valve disc due to viscosity smaller, and the adhesion resistance of the valve disc when opening the one-way valve is smaller. The small movement resistance and small movement stroke of the valve disc enable the one-way valve to quickly switch between opening and closing, making the one-way valve have a higher sensitivity. In addition, the above-mentioned line contact one-way valve, because a through-hole structure is provided on the baffle plate that fixes the valve disc, reduces the suction resistance of the valve disc when it is separated from the baffle plate when closing the one-way valve, thereby improving the stability of the one-way valve.

[0058] In another preferred embodiment,

[0059] The top of the valve seat (1) is provided with an inlet countersunk hole (1-1), and the bottom is provided with an outlet countersunk hole (1-2); the bottom surface of the outlet countersunk hole (1-2) is provided with an inner sealing boss (1-4) and an outer sealing boss (1-5) which are concentric with each other; a valve plate limiting boss (1-6) is provided between the inner sealing boss (1-4) and the outer sealing boss (1-5); and a plurality of flow holes (1-3) are provided between the inlet countersunk hole (1-1) of the valve seat (1) and the outlet countersunk hole (1-2);

[0060] A circle of outer edge bosses (3-1) is arranged at the outer edge of the front end surface of the baffle (3).

[0061] In another preferred embodiment,

[0062] The top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5), the top end surface of the valve plate limiting boss (1-6) and the top end surface of the outer edge boss (3-1) on the valve seat (1) are all curved surfaces, and the one-way valve has a relatively large total sealing belt length through the inner sealing boss (1-4) and the outer sealing boss (1-5);

[0063] When the one-way valve is closed, the contact between the valve plate (2) and the top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5) and the top end surface of the valve plate limiting boss (1-6) on the valve seat (1) is in a line contact state.

[0064] When the one-way valve is opened, the contact between the valve plate (2) and the top end surface of the outer edge boss (3-1) is also in a line contact state.

[0065] In another preferred embodiment,

[0066] A central through hole (2-1) is provided at the center of the valve plate (2), and a plurality of protruding teeth (2-2) are provided on the edge of the central through hole (2-1).

[0067] In another preferred embodiment,

[0068] A tubular column (1-8) is provided on the valve seat (1), a valve seat through hole is provided on the inner circle of the tubular column (1-8), an annular groove (1-10) is provided on the outer circle, and a valve plate (2) is sleeved on the outer circle of the tubular column (1-8);

[0069] An axial through hole is provided at the center of the baffle (3), and a chamfer (3-2) is provided at the rear end opening of the axial through hole;

[0070] The baffle plate (3) is installed in the annular groove (1-10), the edge of the bottom surface of the annular groove (1-10) is buckled on the conical surface of the chamfer (3-2) of the rear end opening of the axial through hole, and the front end surface of the baffle plate (3) is pressed against the top surface of the annular groove (1-10).

[0071] In another preferred embodiment,

[0072] A recess (1-7) is provided inside the inner sealing boss (1-4), and a tubular column (1-8) extends axially from the bottom surface of the recess (1-7).

[0073] In another preferred embodiment,

[0074] A gap is provided between the top of the valve plate limiting boss (1-6) and the plane where the tops of the inner sealing boss (1-4) and the outer sealing boss (1-5) are located.

[0075] In another preferred embodiment,

[0076] There is a gap between the top end of the outer edge boss (3-1) and the rear end surface of the valve plate (2) when the one-way valve is in a closed state.

[0077] In another preferred embodiment,

[0078] A plurality of transverse through holes (1-11) are provided on the skirt of the valve seat (1).

[0079] In another preferred embodiment,

[0080] An outer annular groove is provided on the outer circle of the valve seat (1), a sealing ring (4) is provided in the outer annular groove, and a longitudinal groove (1-9) is provided on the axis of the tubular column (1-8).

[0081] In another preferred embodiment,

[0082] See attached Figure 1 The top of the valve seat (1) is provided with an inlet counterbore (1-1), the bottom is provided with an outlet counterbore (1-2), the bottom surface of the outlet counterbore (1-2) is provided with an inner sealing boss (1-4) and an outer sealing boss (1-5) which are concentric with each other, and a valve plate limiting boss (1-6) is provided between the inner sealing boss (1-4) and the outer sealing boss (1-5); a circle of outer edge bosses (3-1) is provided at the outer edge of the front end surface of the baffle (3).

[0083] The top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5), the top end surface of the valve plate limiting boss (1-6) and the top end surface of the outer edge boss (3-1) on the valve seat (1) are all curved surfaces. The inner sealing boss (1-4) and the outer sealing boss (1-5) enable the one-way valve to have a relatively large total sealing belt length. When the one-way valve is closed, the contact between the valve plate (2) and the top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5) and the top end surface of the valve plate limiting boss (1-6) on the valve seat (1) is in a line contact state. When the one-way valve is opened, the contact between the valve plate (2) and the top end surface of the outer edge boss (3-1) is also in a line contact state.

[0084] At this point, the working principle of the one-way valve of the present invention can be understood:

[0085] When the pressure on the outlet side of the crankcase is greater than the pressure on the inlet side, the force generated by the pressure difference on both sides of the valve plate (2) presses the valve plate (2) against the top end surface of the outer sealing boss (1-5) and the top end surface of the inner sealing boss (1-4) of the valve seat (1) to close the one-way valve, thereby preventing the oil vapor in the engine crankcase from overflowing. When the pressure on the outlet side is much greater than the pressure on the inlet side, the valve plate (2) is deformed by a deformation amount of a gap δ1 into the flow hole (1-3) and then presses against the top surface of the valve plate limiting boss (1-6) of the valve seat (1). When the one-way valve is in a closed state, there is a gap δ2 between the top end of the outer edge boss (3-1) and the rear end surface of the valve plate (2). When the pressure on the outlet side of the one-way valve is lower than the pressure on the inlet side, the force generated by the pressure difference pushes the valve plate (2) to move a gap of length δ2 and then presses on the top surface of the outer edge boss (3-1) to open the one-way valve. The inlet of the valve seat (1) is connected to the breathing duct outside the engine crankcase, and the outlet counterbore (1-2) is connected to the inner cavity of the engine crankcase. Under the action of the pressure difference force, the oil at the inlet of the valve seat (1) flows into the engine crankcase from the flow hole (1-3) of the valve seat (1), the opening opened by the valve plate (2) and the outlet counterbore (1-2) of the valve seat (1), thereby realizing the reflux of the oil outside the crankcase into the crankcase.

[0086] It can be understood that the most critical aspects of the above embodiments are:

[0087] When the one-way valve is closed, the contact between the valve plate (2) and the top end face of the outer sealing boss (1-5), the top end face of the inner sealing boss (1-4), and the top end face of the valve plate limiting boss (1-6) is in a line contact state; when the one-way valve is opened, the contact between the valve plate (2) and the top end face of the outer edge boss (3-1) is also in a line contact state; wherein, the contact area of ​​the line contact is small, so that the adhesion force generated by the viscosity of the oil at the contact point of the valve plate (2) is small, and the adhesion resistance of the valve plate (2) from the top end face of the outer sealing boss (1-5), the top end face of the inner sealing boss (1-4), and the top end face of the valve plate limiting boss (1-3) on the valve seat (1) when the one-way valve is opened is small, and the movement resistance of the valve plate (2) is small and the movement stroke is small, so that the one-way valve can be quickly switched between opening and closing, thereby achieving high sensitivity of the one-way valve.

[0088] In another preferred embodiment,

[0089] See attached Figure 1-3, a center through hole (2-1) is provided at the center of the valve plate (2), and a plurality of convex teeth (2-2) are provided at the edge of the center through hole (2-1). A tubular column (1-8) is provided on the valve seat (1), the inner circle of the tubular column (1-8) is provided with a valve seat through hole, and the outer circle is provided with an annular groove (1-10), and the valve plate (2) is sleeved on the outer circle of the tubular column (1-8). An axial through hole is provided at the center of the baffle plate (3), and a chamfer (3-2) is provided at the rear end opening of the axial through hole. The baffle plate (3) is installed in the annular groove (1-10), and the edge of the bottom surface of the annular groove (1-10) is buckled on the conical surface of the chamfer (3-2) of the rear end opening of the axial through hole, and the front end surface of the baffle plate (3) is pressed against the top surface of the annular groove (1-10). A recess (1-7) is provided inside the inner sealing boss (1-4), and a tubular column (1-8) extends axially from the bottom surface of the recess (1-7). In addition, an outer annular groove is provided on the outer circle of the valve seat (1), a sealing ring (4) is provided in the outer annular groove, and a longitudinal groove (1-9) is provided on the axis of the tubular column (1-8).

[0090] In the above embodiment, the protruding teeth (2-2) on the edge of the center hole (2-1) of the valve plate (2) are sleeved on the outer circle of the tubular column (1-8) to achieve radial positioning and accurate installation. When the baffle (3) is assembled on the tubular column (1-8), the axial through hole of the baffle (3) squeezes the tubular column (1-8) to cause it to produce elastic deformation and shrink toward the axis, so that the baffle (3) falls into the annular groove (1-10) on the outer circle of the tubular column (1-8). After the baffle plate (3) falls into the annular groove (1-10), the tubular column (1-8) is elastically deformed under the tension, and the edge of the bottom surface of the annular groove (1-10) is buckled on the chamfered (3-2) conical surface of the rear end opening of the axial through hole of the baffle plate (3). The longitudinal and transverse pressing forces generated by the pressure on the chamfered (3-2) conical surface of the rear end opening of the baffle plate (3) cause the front end surface of the baffle plate (3) to press against the top surface of the annular groove (1-10), so that the baffle plate (3) is fixed in the annular groove (1-10). The sealing ring (4) on the outer circle of the valve seat (1) separates the space on both sides of the inlet and outlet from the outside of the one-way valve.

[0091] In another preferred embodiment,

[0092] See attached Figure 1-3 A gap is provided between the top of the valve plate limiting boss (1-6) and the plane where the tops of the inner sealing boss (1-4) and the outer sealing boss (1-5) are located, and a gap is provided between the top of the outer edge boss (3-1) and the rear end surface of the valve plate (2) when the one-way valve is in a closed state. The above arrangement is not only conducive to accurate positioning during the assembly process, but also convenient for installation.

[0093] The skirt of the valve seat (1) is provided with a plurality of transverse through holes (1-11), so that when the one-way valve needs to be replaced, the hook of the caliper is buckled into the transverse hole (1-11) and the one-way valve can be removed from its installation hole by pulling it outwards.

[0094] It should be noted that Figures 4 to 6 They are Figures 1 to 3 3D schematic diagrams of the , which can be referenced to each other.

[0095] In another preferred embodiment,

[0096] A one-way valve comprises a valve seat (1), a valve plate (2), a baffle (3) and a sealing ring (4); an annular groove is provided on the outer circle of the valve seat (1); the sealing ring (4) is installed in the outer annular groove of the valve seat (1); a flow channel inlet countersunk hole (1-1) is provided on the top of the valve seat (1); a flow channel outlet countersunk hole (1-2) is provided on the bottom of the valve seat (1); a plurality of flow holes (1-3) are provided between the inlet countersunk hole (1-1) and the outlet countersunk hole (1-2) of the valve seat (1); an inner sealing boss (1-4) and an outer sealing boss (1-5) are provided on the bottom surface of the outlet countersunk hole (1-2) of the valve seat (1); the top end surface of the inner sealing boss (1-4) is a curved surface; the top end surface of the outer sealing boss (1-5) is also a curved surface; the inner sealing boss (1-4) is provided with a curved surface; the inner sealing boss (1-5) is provided with a curved surface; the inner sealing boss (1-4) is provided with a curved surface; the inner sealing boss (1-5) is provided with a curved surface; the inner sealing boss (1-4) is provided with a curved surface; the inner sealing boss (1-5) is provided with a curved surface; the inner sealing boss (1-5) is provided with a curved surface; the inner sealing boss (1-4) is provided with a curved surface; the inner sealing boss (1-5) is provided with a curved surface; the inner sealing boss (1-5) is provided with a curved surface; the inner sealing boss (1-1 ... The top ends of the sealing boss (1-4) and the outer sealing boss (1-5) are in the same plane, a valve plate limiting boss (1-6) is provided in the flow hole (1-3) between the inner sealing boss (1-4) and the outer sealing boss (1-5), the top end surface of the valve plate limiting boss (1-6) is a curved surface, a gap δ1 is provided between the top end of the valve plate limiting boss (1-6) and the plane where the top ends of the inner sealing boss (1-4) and the outer sealing boss (1-5) are located, a pit (1-7) is provided inside the inner sealing boss (1-4), a tubular column (1-8) extends axially from the bottom surface of the pit (1-7), a longitudinal groove (1-9) is provided on the axis of the tubular column (1-8), an annular groove (1-10) is provided on the outer circle of the tubular column (1-8), and a groove (1-11) is provided on the outer circle of the valve plate limiting boss (1-6). The skirt of the seat (1) is provided with a plurality of transverse through holes (1-11), the center of the valve plate (2) is provided with a through hole (2-1), and the edge of the center hole (2-1) of the valve plate (2) is provided with a plurality of convex teeth (2-2), the convex teeth (2-2) on the edge of the center hole (2-1) of the valve plate (2) are sleeved on the outer circle of the tubular column (1-8) on the valve seat (1) to achieve radial positioning, the longitudinal groove (1-9) on the tubular column (1-8) on the valve seat (1) and the gap between the outer circle of the tubular column (1-8) and the center hole (2-1) of the valve plate (2) constitute the flow gap inside the inner sealing boss (1-4), the gap between the outer edge of the valve plate (2) and the hole wall of the outlet counterbore (1-2) of the valve seat (1) constitutes the flow gap outside the outer sealing boss (1-5), A circle of bosses (3-1) is arranged at the outer edge of the front end surface of the baffle (3); the top end surface of the bosses (3-1) at the outer edge of the front end of the baffle (3) is a curved surface; a through hole is arranged at the axis of the baffle (3) and a chamfer (3-2) is arranged at the rear end opening of the through hole; a plurality of through holes (3-3) are arranged on the baffle (3) to connect the front and rear end surfaces of the baffle (3); the baffle (3) is installed in an annular groove (1-10) on the outer circle of the tubular column (1-8) on the valve seat (1); when the baffle (3) is installed on the tubular column (1-8) of the valve seat (1), the axial center hole of the baffle (3) squeezes the tubular column (1-8) of the valve seat (1) to cause elastic deformation and shrinkage toward the axis, so that the baffle (3) falls into the annular groove (1-10) on the outer circle of the tubular column (1-8) on the valve seat (1);After the tubular column (1-8) of the valve seat (1) falls into the annular groove (1-10) of the tubular column (1-8) of the valve seat (1) after the baffle plate (3), the tubular column (1-8) on the valve seat (1) is elastically deformed under the tension, and the edge of the bottom surface of the outer annular groove (1-10) of the tubular column (1-8) of the valve seat (1) is buckled on the chamfered (3-2) conical surface of the rear end opening of the axial through hole of the baffle plate (3). The longitudinal pressing force and the lateral pressing force generated by the pressure on the chamfered (3-2) conical surface of the rear end opening of the baffle plate (3) cause the front end surface of the baffle plate (3) to press against the top surface of the annular groove (1-10) on the outer circle of the tubular column (1-8) of the valve seat (1), so that the baffle plate (3) is fixed on the tubular column (1-8) of the valve seat (1). ), the sealing ring (4) on the outer circle of the valve seat (1) separates the space on both sides of the inlet and outlet from the outside of the one-way valve. When the pressure on the outlet side is greater than the pressure on the inlet side, the force generated by the pressure difference on both sides of the valve plate (2) presses the valve plate (2) against the top surface of the inner sealing boss (1-4) and the top surface of the outer sealing boss (1-5) of the valve seat (1) to close the one-way valve, thereby preventing the oil vapor in the engine crankcase from overflowing. When the pressure on the outlet side is greater than the pressure on the inlet side, the valve plate (2) is deformed by being recessed into the flow hole (1-3) to a deformation amount of the length of the gap δ1, and then presses against the top surface of the valve plate limiting boss (1-6) of the valve seat (1). The outer edge boss (3-1) at the front end of the baffle plate (3) is There is a gap δ2 between the top end and the rear end face of the valve plate (2) when the one-way valve is in a closed state. When the pressure on the outlet side of the one-way valve is less than the pressure on the inlet side, the force generated by the pressure difference pushes the valve plate (2) by a displacement of the length of the gap δ2 and then presses on the top face of the boss (3-1) at the front outer edge of the baffle (3) to open the one-way valve. The inlet countersunk hole (1-1) of the valve seat (1) is connected to the breathing duct outside the engine crankcase. Under the action of the pressure difference force, the oil in the inlet countersunk hole (1-1) of the valve seat (1) flows into the engine crankcase from the flow hole (1-3) of the valve seat (1), the opening opened by the valve plate (2) and the outlet countersunk hole (1-2) of the valve seat (1), thereby realizing the reflux of the oil outside the crankcase into the crankcase. The valve seat ( The top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5), the top end surface of the valve plate limiting boss (1-6) and the top end surface of the outer edge boss (3-1) at the front end of the baffle plate (3) are all arranged to be curved surfaces. When the one-way valve is closed, the valve plate (2) is in line contact with the top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5) and the top end surface of the valve plate limiting boss (1-6) on the valve seat (1). When the one-way valve is opened, the valve plate (2) is also in line contact with the top end surface of the outer edge boss (3-1) at the front end of the baffle plate (3). The small contact area of ​​the line contact reduces the adhesion of the oil at the contact point of the valve plate (2) due to viscosity.The valve disc (2) has a small adhesive resistance when it separates from the inner sealing boss (1-4), the outer sealing boss (1-5) and the valve disc limiting boss (1-6) when opening the one-way valve, and separates from the boss (3-1) at the front end outer edge of the baffle plate (3) when closing the one-way valve. When the valve disc (2) is closed, it separates from the baffle plate (3) to produce a suction effect. The through hole (3-3) on the baffle plate (3) allows the fluid at the bottom of the baffle plate (3) to quickly enter the gap between the valve disc (2) and the baffle plate (3) through the through hole (3-3), thereby reducing the valve disc (2) separating from the baffle plate (3) when closing the one-way valve. The suction resistance is small, the valve seat (1) is provided with an inner sealing boss (1-4) and an outer sealing boss (1-5), so that the one-way valve has a larger total length of the sealing belt, and the valve plate (2) can obtain a sufficiently large flow cross section in the sealing belt section by opening a small opening. The valve plate (2) has a small movement resistance and a small movement stroke, so that the one-way valve can be quickly switched between opening and closing, thereby achieving high sensitivity of the one-way valve. In addition, when the one-way valve needs to be replaced, the hook of the caliper is buckled into the transverse through hole (1-11) of the skirt of the valve seat (1) and pulled outward to conveniently remove the one-way valve from its installation hole.

[0097] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A line contact check valve, characterized in that: The valve seat (1) comprises a valve plate (2), a baffle (3) and a sealing ring (4). An annular groove is arranged on the outer circle of the valve seat (1). The sealing ring (4) is installed in the outer annular groove of the valve seat (1). A flow channel inlet countersunk hole (1-1) is arranged on the top of the valve seat (1). A flow channel outlet countersunk hole (1-2) is arranged on the bottom of the valve seat (1). A plurality of flow holes (1-3) are arranged between the inlet countersunk hole (1-1) and the outlet countersunk hole (1-2) of the valve seat (1). An inner sealing boss (1-4) and an outer sealing boss (1-5) are arranged on the bottom surface of the outlet countersunk hole (1-2) of the valve seat (1). The top end surface of the inner sealing boss (1-4) is a curved surface. The top end surface of the outer sealing boss (1-5) is also a curved surface. The top ends of the inner sealing boss (1-4) and the outer sealing boss (1-5) are In the same plane, a valve plate limiting boss (1-6) is provided in the flow hole (1-3) between the inner sealing boss (1-4) and the outer sealing boss (1-5); the top end surface of the valve plate limiting boss (1-6) is a curved surface; a gap δ1 is provided between the top of the valve plate limiting boss (1-6) and the plane where the tops of the inner sealing boss (1-4) and the outer sealing boss (1-5) are located; a pit (1-7) is provided inside the inner sealing boss (1-4); a tubular column (1-8) extends axially from the bottom surface of the pit (1-7); a longitudinal groove (1-9) is provided on the axis of the tubular column (1-8); an annular groove (1-10) is provided on the outer circle of the tubular column (1-8); and a plurality of transverse through holes are provided on the skirt of the valve seat (1). (1-11), a through hole (2-1) is provided at the center of the valve plate (2), and a plurality of convex teeth (2-2) are provided at the edge of the center hole (2-1) of the valve plate (2), and the convex teeth (2-2) at the edge of the center hole (2-1) of the valve plate (2) are sleeved on the outer circle of the tubular column (1-8) on the valve seat (1) to achieve radial positioning, and the longitudinal groove (1-9) on the tubular column (1-8) on the valve seat (1) and the gap between the outer circle of the tubular column (1-8) and the center hole (2-1) of the valve plate (2) constitute the flow gap inside the inner sealing boss (1-4), and the gap between the outer edge of the valve plate (2) and the hole wall of the outlet counterbore (1-2) of the valve seat (1) constitutes the flow gap outside the outer sealing boss (1-5), and the front end of the baffle (3) A circle of bosses (3-1) is arranged at the outer edge of the surface, the top end surface of the bosses (3-1) at the outer edge of the front end of the baffle (3) is a curved surface, a through hole is arranged at the axis of the baffle (3) and a chamfer (3-2) is arranged at the rear end opening of the through hole, a plurality of through holes (3-3) are arranged on the baffle (3) to connect the front and rear end surfaces of the baffle (3), the baffle (3) is installed in the annular groove (1-10) on the outer circle of the tubular column (1-8) on the valve seat (1), when the baffle (3) is installed on the tubular column (1-8) of the valve seat (1), the axial center hole of the baffle (3) squeezes the tubular column (1-8) of the valve seat (1) to make it produce elastic deformation and shrink toward the axis, so that the baffle (3) falls into the annular groove (1-10) on the outer circle of the tubular column (1-8) on the valve seat (1),After the tubular column (1-8) of the valve seat (1) falls into the annular groove (1-10) of the tubular column (1-8) of the valve seat (1) after the baffle plate (3), the tubular column (1-8) on the valve seat (1) is elastically deformed under the tension, and the edge of the bottom surface of the outer annular groove (1-10) of the tubular column (1-8) of the valve seat (1) is buckled on the chamfered (3-2) conical surface of the rear end opening of the axial through hole of the baffle plate (3). The longitudinal pressing force and the lateral pressing force generated by the pressure on the chamfered (3-2) conical surface of the rear end opening of the baffle plate (3) cause the front end surface of the baffle plate (3) to press against the top surface of the annular groove (1-10) on the outer circle of the tubular column (1-8) of the valve seat (1), so that the baffle plate (3) is fixed on the tubular column (1-8) of the valve seat (1). ), the sealing ring (4) on the outer circle of the valve seat (1) separates the space on both sides of the inlet and outlet from the outside of the one-way valve. When the pressure on the outlet side is greater than the pressure on the inlet side, the force generated by the pressure difference on both sides of the valve plate (2) presses the valve plate (2) against the top surface of the inner sealing boss (1-4) and the top surface of the outer sealing boss (1-5) of the valve seat (1) to close the one-way valve, thereby preventing the oil vapor in the engine crankcase from overflowing. When the pressure on the outlet side is greater than the pressure on the inlet side, the valve plate (2) is deformed by being recessed into the flow hole (1-3) to a deformation amount of the length of the gap δ1, and then presses against the top surface of the valve plate limiting boss (1-6) of the valve seat (1). The outer edge boss (3-1) at the front end of the baffle plate (3) is There is a gap δ2 between the top end and the rear end face of the valve plate (2) when the one-way valve is in a closed state. When the pressure on the outlet side of the one-way valve is less than the pressure on the inlet side, the force generated by the pressure difference pushes the valve plate (2) by a displacement of the length of the gap δ2 and then presses on the top face of the boss (3-1) at the front outer edge of the baffle (3) to open the one-way valve. The inlet countersunk hole (1-1) of the valve seat (1) is connected to the breathing duct outside the engine crankcase. Under the action of the pressure difference force, the oil in the inlet countersunk hole (1-1) of the valve seat (1) flows into the engine crankcase from the flow hole (1-3) of the valve seat (1), the opening opened by the valve plate (2) and the outlet countersunk hole (1-2) of the valve seat (1), thereby realizing the reflux of the oil outside the crankcase into the crankcase. The valve seat ( The top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5), the top end surface of the valve plate limiting boss (1-6) and the top end surface of the outer edge boss (3-1) at the front end of the baffle plate (3) are all arranged to be curved surfaces. When the one-way valve is closed, the valve plate (2) is in line contact with the top end surface of the inner sealing boss (1-4), the top end surface of the outer sealing boss (1-5) and the top end surface of the valve plate limiting boss (1-6) on the valve seat (1). When the one-way valve is opened, the valve plate (2) is also in line contact with the top end surface of the outer edge boss (3-1) at the front end of the baffle plate (3). The small contact area of ​​the line contact reduces the adhesion of the oil at the contact point of the valve plate (2) due to viscosity.The valve disc (2) has a small adhesive resistance when it is separated from the inner sealing boss (1-4), the outer sealing boss (1-5) and the valve disc limiting boss (1-6) when the one-way valve is opened, and when it is separated from the front end outer edge boss (3-1) of the baffle plate (3) when the one-way valve is closed. When the valve disc (2) is separated from the baffle plate (3) when the one-way valve is closed, a suction effect is generated. The through hole (3-3) on the baffle plate (3) allows the fluid at the bottom of the baffle plate (3) to quickly enter the gap between the valve disc (2) and the baffle plate (3) through the through hole (3-3), thereby reducing the valve disc (2) from separating from the baffle plate (3) when the one-way valve is closed. The valve seat (1) is provided with an inner sealing boss (1-4) and an outer sealing boss (1-5), so that the one-way valve has a larger total length of the sealing belt. The valve plate (2) can obtain a sufficiently large flow cross section in the sealing belt section by opening a smaller opening. The valve plate (2) has a small movement resistance and a small movement stroke, so that the one-way valve can be quickly switched between opening and closing, thereby achieving high sensitivity of the one-way valve. When the one-way valve needs to be replaced, the hook of the caliper is buckled into the transverse through hole (1-11) of the skirt of the valve seat (1) and pulled outward to conveniently remove the one-way valve from its installation hole.

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