A high-pressure oil pump and an oil inlet valve thereof

Abstract

The application provides an oil inlet valve, which comprises a gasket and a plurality of valve plates, the surface of the gasket is provided with a plurality of gasket through holes, the valve plate is provided with a valve through hole, each valve through hole corresponds to a gasket through hole, and the valve plate is arranged on the gasket, wherein when power fluid flows from the gasket through hole to the valve through hole, the power fluid pushes the valve plate to make the valve plate tilt to form an inclination angle greater than 0 with the gasket; when power fluid flows from the valve through hole to the gasket through hole, the power fluid pushes the tilted valve plate to reset. The oil inlet valve realizes the flow effect through the cooperation of the gasket through hole and the valve through hole, and realizes the pressure regulating effect through the existence of the valve plate; the spread of the pressure fluctuation of the low-pressure cavity of the high-pressure pump to the low-pressure oil pipe is reduced, and the throttling problem when the low-pressure oil circuit supplies large oil to the high-pressure cavity is avoided, so that the performance of the high-pressure pump and the low-pressure oil pipe is improved, and the structure is simple and the work is reliable.

Description

Technical Field

[0001] This invention relates to valve bodies, and more specifically to a high-pressure oil pump and its inlet valve. Background Technology

[0002] In the high-pressure pump of a gasoline engine's direct injection fuel system, the backflow of high-pressure fuel from the plunger chamber into the low-pressure chamber during the overflow stroke causes significant pressure fluctuations in the low-pressure chamber. These pressure fluctuations propagate to the low-pressure fuel line, increasing its impact load and leading to decreased reliability and cavitation at the high-pressure pump inlet. Particularly under high-speed conditions, the pressure fluctuations in the low-pressure chamber are severe, resulting in more intense pressure shocks to the low-pressure fuel line and increasing the likelihood of rupture, posing a serious challenge to its reliability. Therefore, it is necessary to minimize the propagation of fuel pressure fluctuations from the low-pressure chamber to the low-pressure fuel line to reduce the risk of rupture and improve its durability and reliability.

[0003] Currently, a pressure fluctuation damper is commonly used to reduce fuel pressure fluctuations in the low-pressure chamber of a high-pressure pump. Simultaneously, a throttling orifice is placed at the inlet of the low-pressure chamber to suppress the propagation of pressure fluctuations from the low-pressure chamber to the low-pressure fuel line. International patent WO20120957189A3 discloses a high-pressure pump with a variable cross-section fuel passage at the pump's inlet end. This passage includes a throttling orifice connecting the low-pressure chamber and the inlet. This throttling orifice further reduces fuel pressure fluctuations propagating to the low-pressure fuel line.

[0004] In the aforementioned prior art, a throttling orifice is installed in the oil inlet passage of the high-pressure pump. However, the size of the throttling orifice directly affects the fuel flow rate. When the orifice area is small, the high-pressure pump experiences significant throttling at high flow rates, resulting in decreased fuel supply efficiency. When the orifice area is large, it cannot effectively suppress the propagation of pressure fluctuations in the low-pressure chamber to the low-pressure oil pipe.

[0005] Therefore, it is necessary to provide an oil inlet valve that facilitates flow regulation. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an oil inlet valve that facilitates flow regulation.

[0007] The technical solution adopted by this invention to solve its technical problem is: an oil inlet valve, comprising a gasket and a plurality of valve plates, wherein the surface of the gasket is provided with a plurality of gasket through holes, and each valve plate is provided with a valve through hole, each valve through hole corresponding to one of the gasket through holes, and the valve plate is disposed on the gasket.

[0008] When the power fluid flows from the gasket through hole to the valve through hole, the power fluid pushes against the valve plate, causing the valve plate to tilt up and form an angle greater than 0 with the gasket.

[0009] When the hydraulic fluid flows from the valve through-hole to the gasket through-hole, the hydraulic fluid pushes against the raised valve plate to reset it.

[0010] Preferably, the valve plate blocks the gasket through hole.

[0011] Preferably, the gasket through hole and the valve through hole are coaxially fixed, and the diameter of the gasket through hole is larger than the diameter of the valve through hole.

[0012] Preferably, the gasket through-hole and the valve through-hole are circular, elliptical, triangular, rectangular, or regular polygonal in shape.

[0013] Preferably, the perforations of the pad are arranged circumferentially.

[0014] Preferably, the valve plate includes an integrally formed stem and blade;

[0015] The valve through-hole is formed on the blade;

[0016] One end of the stem, away from the leaves, is fixed to the gasket.

[0017] Preferably, the stem is curved relative to the surface of the pad to form an arc.

[0018] Preferably, this type of oil inlet valve also includes a positioning block, with one end of the stem away from the blade fixed to the positioning block, and the positioning block being fixedly connected to the gasket.

[0019] The beneficial effect of this invention is that this type of oil inlet valve achieves the effect of flow by using a gasket through hole to cooperate with a valve through hole, and achieves the effect of pressure regulation by the presence of a valve plate;

[0020] This type of inlet valve reduces the propagation of pressure fluctuations from the low-pressure chamber of the high-pressure pump to the low-pressure oil pipe, and avoids the throttling problem when the low-pressure oil circuit supplies a large amount of oil to the high-pressure chamber. This improves the performance of the high-pressure pump and the low-pressure oil pipe, while also being simple in structure and reliable in operation.

[0021] The present invention also provides a high-pressure oil pump, including a high-pressure oil pump body and an oil inlet connector fixed at the oil inlet.

[0022] An oil inlet valve as described above is fixed at the oil inlet connector, and the valve plate is located on the side away from the opening of the oil inlet connector.

[0023] Preferably, the high-pressure oil pump body has an annular chamber at the oil inlet, and the bottom of the annular chamber has a locking chamber.

[0024] The oil inlet valve is fitted inside the fitting chamber, the gasket is pressed against the bottom wall of the fitting chamber, and the stem extends into the oil inlet.

[0025] The oil inlet connector is threaded into the annular chamber and the end of the oil inlet connector abuts against the annular chamber.

[0026] The beneficial effects of this invention are that when fuel with large pressure fluctuations in the low-pressure chamber flows back to the low-pressure chamber inlet through the inlet valve, the pressure fluctuations are weakened, thereby avoiding the pressure impact of fuel pressure fluctuations on the low-pressure oil pipe and reducing the risk of early damage; it also avoids the throttling of the inlet valve when the high-pressure pump has a large fuel flow rate, and the high-pressure pump has a simple structure and reliable operation. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the preferred embodiment of an oil inlet valve according to Embodiment 1 of the present invention.

[0029] Figure 2 This is a cross-sectional schematic diagram of the preferred embodiment of an oil inlet valve according to Embodiment 1 of the present invention.

[0030] Figure 3 This is a cross-sectional schematic diagram of two working positions of the valve plate according to Embodiment 1 of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure of the valve through hole in Embodiment 1 of the present invention, which is elliptical.

[0032] Figure 5 This is a schematic diagram of the valve through-hole being triangular in Embodiment 1 of the present invention.

[0033] Figure 6 This is a schematic diagram of the valve through-hole being rhomboid in Embodiment 1 of the present invention.

[0034] Figure 7 This is a schematic diagram of the valve through-hole being a regular hexagon in Embodiment 1 of the present invention.

[0035] Figure 8 This is a schematic diagram of the structure of the five valve plates in Embodiment 1 of the present invention.

[0036] Figure 9 This is a schematic diagram of the structure of the six valve plates in Embodiment 1 of the present invention.

[0037] Figure 10 This is a schematic diagram of the structure in Embodiment 1 of the present invention, showing the formation of an arc in the stem.

[0038] Figure 11 This is a schematic diagram of the preferred embodiment of an oil inlet valve according to Embodiment 1 of the present invention.

[0039] Figure 12This is a schematic diagram of the optimal embodiment of a high-pressure oil pump according to Embodiment 2 of the present invention.

[0040] In the picture:

[0041] Gasket 1, through hole 101;

[0042] Valve plate 2, valve through hole 201, blade 202, rounded corner 2021, stem 203, curve 2031;

[0043] Positioning block 3, oil inlet valve A, oil inlet B, oil inlet connector C, high-pressure oil pump body D;

[0044] Low-pressure chamber 4, high-pressure chamber 5, annular chamber wall 6, and clamping chamber wall 7. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Rather, embodiments of the invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0046] In the description of this invention, 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] Example 1,

[0049] like Figures 1-3 As shown, an oil inlet valve A includes a gasket 1 and several valve plates 2. The surface of the gasket 1 has several gasket through holes 101, and each valve plate 2 has a valve through hole 201. Each valve through hole 201 corresponds to one gasket through hole 101. The valve plate 2 covers the gasket 1.

[0050] When the power fluid flows from the gasket through hole 101 to the valve through hole 201, the power fluid pushes against the valve plate 2 to make the valve plate 2 tilt up and form an inclination angle greater than 0 with the gasket 1; when the power fluid flows from the valve through hole 201 to the gasket through hole 101, the power fluid pushes against the tilted valve plate 2 to make it return to its original position.

[0051] The gasket 1 can be cylindrical, and a number of through holes 101 are distributed in a circular shape, and the circular shape is coaxial with the gasket 1 itself.

[0052] By setting the valve plate 2 to block the through hole 101, when the power fluid enters through the through hole 101, it will first impact the valve plate 2. This impact will first greatly reduce the pressure of the power fluid itself and slow down its flow speed. Simultaneously, the valve plate 2 will be impacted and tilted to form an angle. At this time, the power fluid will pass through the through hole 101 at a relatively fast speed and enter the high-pressure pump along the side wall surface of the valve plate 2 or the through hole 201.

[0053] Here, the gasket through-hole 101 and the valve through-hole 201 are coaxially fixed, and the diameter of the gasket through-hole 101 is larger than the diameter of the valve through-hole 201. This design ensures that the power fluid will inevitably impact the valve plate 2 after entering the gasket through-hole 101, thus ensuring that the valve plate 2 is tilted.

[0054] like Figures 4-7 As shown, the gasket through-hole 101 and the valve through-hole 201 are circular, elliptical, triangular, rectangular, or regular polygonal in shape. Preferably, the cross-sectional shape of the gasket through-hole 101 is circular, and the cross-sectional shape of the valve through-hole 201 is also circular. If other shapes are used, it is only necessary to ensure that the cross-section of the valve through-hole 201 is completely contained within the cross-section of the gasket through-hole 101 along the axial direction of the gasket 1.

[0055] like Figure 8 and 9 As shown, the number of valve plates 2 can be multiple, such as four, five, six or even more, depending on the specific needs.

[0056] like Figure 10As shown, the valve plate 2 includes an integrally formed stem 203 and a blade 202; the valve through hole 201 is formed on the blade 202; one end of the stem 203, away from the blade 202, is fixed to the gasket 1. The stem 203 is thinner than the blade 202, and the stem 203 is elongated, which facilitates the lifting and lowering of the blade 202.

[0057] The stem 203 is curved relative to the surface of the gasket 1 to form an arc. This arc facilitates further bending and curling of the blades 202, thereby enabling the entry of the kinetic fluid.

[0058] This type of oil inlet valve A also includes a positioning block 3. One end of the stem 203, away from the blade 202, is fixed to the positioning block 3, and the positioning block 3 is fixedly connected to the gasket 1. The positioning block 3 is integrally formed with the stem 203 and the blade 202, enhancing the stability of the overall structure.

[0059] like Figure 11 As shown, the edges on both sides of the stem 203 are curved 2031. The use of this curved 2031 provides good guidance for the subsequent curling of the leaves 202, ensuring the stability of the overall structure. The leaves 202 are fan-shaped, with a rounded corner 2021 on one side.

[0060] Example 2

[0061] like Figure 12 As shown, Embodiment 2 is based on Embodiment 1.

[0062] A high-pressure oil pump includes a high-pressure oil pump body D and an oil inlet connector C fixed at the oil inlet B.

[0063] An inlet valve A, as described in Embodiment 1, is fixed at the inlet connector C. The valve plate 2 is positioned on the side away from the opening of the inlet connector C. Here, "side away from the opening of the inlet connector C" means that when fuel (i.e., the fuel referred to in Embodiment 1, but could also be alcohol or other power fluid) is injected into the inlet connector C, it first contacts the gasket 1 and then impacts the valve plate 2. In other words, the distance between the valve plate 2 and the opening of the inlet connector C is greater than the distance between the gasket 1 and the opening of the inlet connector C.

[0064] This type of high-pressure oil pump reduces pressure fluctuations when fuel with large pressure fluctuations in the low-pressure chamber 4 flows back to the inlet B of the low-pressure chamber 4 through the inlet valve A. This avoids pressure shocks to the low-pressure oil pipe caused by fuel pressure fluctuations, reducing the risk of early damage. It also avoids throttling of the inlet valve A when the high-pressure pump has a large fuel flow rate. The high-pressure pump has a simple structure and reliable operation.

[0065] The high-pressure oil pump body D has an annular chamber at the oil inlet B, and the bottom of the annular chamber has a locking chamber.

[0066] The oil inlet valve A is locked in the locking chamber, the gasket 1 is pressed against the bottom wall of the locking chamber, and the stem 203 extends into the oil inlet B;

[0067] The oil inlet connector C is threaded into the annular chamber and the end of the oil inlet connector C abuts against the annular chamber.

[0068] The annular compartment is formed by an annular compartment wall 6, and a threaded connection groove is machined on the inner side of the annular compartment wall 6. The locking compartment is formed by a locking compartment wall 7.

[0069] When the high-pressure pump is filled with fuel, the fuel supply pump provides low-pressure fuel at 3 to 6.5 bar. The fuel flows through the gasket hole 101 of the gasket 1 through the fuel inlet connector C, and then collides with the vane 202 of the valve plate 2. At this time, the hydraulic pressure of the fuel becomes the thrust of the vane 202 of the valve plate 2. This thrust causes the vane 202 to undergo elastic deformation starting from its stem 203, thereby separating the vane 202 from the valve plate 2. The low-pressure fuel quickly flows from the fuel passage on the outer periphery of the valve plate 2 to the fuel inlet B in the high-pressure fuel pump body D. Furthermore, the fuel entering the low-pressure chamber 4 flows into the high-pressure chamber 5.

[0070] Conversely, when the passage between the low-pressure chamber 4 and the high-pressure chamber 5 of the high-pressure oil pump body D is cut off, the fuel in the low-pressure chamber 4 generates abnormal pressure fluctuations due to the "water hammer" effect. These pressure fluctuations are accompanied by fuel flowing back to the inlet B. At this time, the hydraulic pressure generated by the fuel pushes the valve plate 2 back onto the gasket 1. The vane 202 and the gasket 1 are tightly fitted together, and the fuel can only pass through the small-diameter valve through hole 201 on the vane 202. The fuel fluctuations flowing back to the low-pressure oil pipe through the small-diameter valve through hole 201 are further weakened.

[0071] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An oil inlet valve characterized by comprising: It includes a gasket and several valve plates, wherein the surface of the gasket has several through holes. A valve through hole is formed on the valve plate, and each valve through hole corresponds to a gasket through hole. The valve plate is covered on the gasket. When the power fluid flows from the gasket through hole to the valve through hole, the power fluid pushes the valve plate to make the valve plate tilt up and form an inclination angle greater than 0 with the gasket. When the power fluid flows from the valve through hole to the gasket through hole, the power fluid pushes against the raised valve plate to reset it. The valve plate includes an integrally formed stem and a blade; the valve through hole is formed on the blade; one end of the stem away from the blade is fixed to the gasket; It also includes a positioning block, with one end of the stem furthest from the leaf fixed to the positioning block, and the positioning block being fixedly connected to the gasket; the positioning block is located in the middle of the gasket; The stem is curved relative to the surface of the pad to form an arc, and the edges on both sides of the stem are curved; The valve plate blocks the through hole of the gasket; The gasket through hole and the valve through hole are coaxially fixed, and the diameter of the gasket through hole is larger than the diameter of the valve through hole; Several of the aforementioned through holes are distributed circumferentially.

2. The oil admission valve according to claim 1, characterized in that The gasket through-hole and the valve through-hole are circular in shape.

3. A high-pressure oil pump comprising a high-pressure oil pump body and an oil inlet joint fixed at an oil inlet port, characterized by An oil inlet valve as described in any one of claims 1 to 2 is fixed at the oil inlet connector, wherein the valve plate is disposed on the side away from the inlet of the oil inlet connector.

4. The high-pressure oil pump according to claim 3, characterized by The high-pressure oil pump body has an annular chamber at the oil inlet, and the bottom of the annular chamber has a locking chamber. The oil inlet valve is fitted inside the fitting chamber, the gasket is pressed against the bottom wall of the fitting chamber, and the stem extends into the oil inlet. The oil inlet connector is threaded into the annular chamber and the end of the oil inlet connector abuts against the annular chamber.

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