High-pressure oil pump body with good sealing performance

Abstract

The utility model discloses a high-pressure oil pump body with good sealing performance. The high-pressure oil pump body comprises a shell, a sealing mechanism I and a sealing mechanism II, a piston is slidably connected into a piston hole in the rear side of the shell, the middle of the piston is movably sleeved with a first spring, the first spring is located between the rear side face of the shell and a top plate of the piston, and a connecting opening is formed in the outer side of the shell. The first sealing mechanism comprises a pressing assembly, leather cups and a second spring, the two leather cups which are symmetrically distributed up and down are placed in the piston hole, the outer arc faces of inclined plates of the leather cups are both in sliding connection with the outer arc face of the piston, the pressing assembly is arranged between the two leather cups, and the second spring is arranged on the upper surface of the leather cup at the upper end; the second sealing mechanism is arranged on the outer side of the connecting opening, the first sealing mechanism further comprises a second gasket and a clamping spring, according to the high-pressure oil pump body with the good sealing performance, the connecting position of the piston and the safety valve is sealed in a dynamic compensation mode, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure oil pump body technology, specifically a high-pressure oil pump body with good sealing performance. Background Technology

[0002] The high-pressure fuel pump is a core component of the fuel injection system, primarily used in diesel engines or direct-injection gasoline engines. Its function is to pressurize fuel to tens to hundreds of megapascals and deliver it to the injectors via a common rail. This device typically consists of a plunger, a camshaft drive mechanism, inlet and outlet valves, and sealing components. During operation, the camshaft drives the plunger in a reciprocating motion, compressing and pressurizing the fuel within a sealed chamber. Modern high-pressure fuel pumps often employ electronic control (such as piezoelectric or solenoid valve regulation), allowing for precise adjustment of fuel supply pressure and flow rate to adapt to different operating conditions.

[0003] High-pressure oil pumps typically use highly wear-resistant rubber cups for sealing the plunger position. However, these cups will still wear down over time, causing gaps to appear at the contact surface between the cup and the plunger, significantly reducing the sealing performance. Furthermore, the pump body of a high-pressure oil pump is equipped with a safety valve to protect the pump body. This safety valve is threaded and uses a tapered thread for sealing, which has limited sealing effectiveness under high pressure. Therefore, we propose a high-pressure oil pump body with excellent sealing performance. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a high-pressure oil pump body with good sealing performance. By using dynamic compensation to seal the connection between the piston and the safety valve, the sealing performance is improved, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure oil pump body with good sealing performance, comprising a housing, a sealing mechanism one, and a sealing mechanism two;

[0006] Housing: A piston is slidably connected inside the piston hole on its rear side, and a spring is movably sleeved in the middle of the piston. The spring is located between the rear side of the housing and the top plate of the piston. A connection port is opened on the outer side of the housing.

[0007] Sealing mechanism one: It includes a pressing component, a leather cup and a spring two. Two leather cups are placed inside the piston hole, which are symmetrically distributed vertically. The outer arc surfaces of the inclined plates of the leather cups are slidably connected to the outer arc surfaces of the piston. A pressing component is provided between the two leather cups, and a spring two is provided on the upper surface of the upper leather cup.

[0008] Sealing mechanism two: It is located on the outside of the connection port and seals the connection between the piston and the safety valve through dynamic compensation, thereby improving the sealing performance.

[0009] Furthermore, the sealing mechanism one also includes a gasket two and a retaining ring. The gasket two is placed at the upper end of the piston hole, the upper end of the spring two contacts the lower surface of the gasket two, and the retaining ring is engaged at the upper end of the piston hole. The retaining ring is located at the upper end of the gasket two and presses the rubber cup tightly.

[0010] Furthermore, the sealing mechanism also includes a gasket, which is placed on the upper surface of the upper end of the cup, and the upper surface of the gasket contacts the lower end of the spring to protect the cup.

[0011] Furthermore, the clamping assembly includes a clamping ring, which is placed between two leather cups. The clamping ring has a trapezoidal cross-section, and its inner arc surface contacts the inclined plates of the adjacent leather cups, clamping the inclined plates of the leather cups.

[0012] Furthermore, the clamping assembly includes trapezoidal grooves and spring plates. Trapezoidal grooves are provided on both the upper and lower sides of the clamping ring. Spring plates are evenly distributed inside the trapezoidal grooves. The spring plates are L-shaped and are fixedly connected to the bottom wall of the adjacent trapezoidal groove and the side of the trapezoidal groove near the piston, thereby improving the rebound effect.

[0013] Furthermore, the sealing mechanism also includes a sealing ring. A sealing ring is placed between the bottom wall of the piston cup and the inclined plate of the piston cup. The outer arc surface of the sealing ring is slidably connected to the outer arc surface of the piston, thereby increasing the sealing performance.

[0014] Furthermore, the second sealing mechanism includes a sleeve, a sealing groove, a second sealing ring, and a third sealing ring. A sleeve is provided on the outer side of the connection port. A sealing groove is formed on the inner arc surface of the sleeve. The second sealing ring and the third sealing ring are placed inside the sealing groove. The third sealing ring has a trapezoidal cross-section. The second sealing ring is located between the side wall of the sealing groove and the outer arc surface of the third sealing ring to seal the connection port.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-pressure oil pump body with good sealing performance has the following advantages:

[0016] 1. The piston moves in and out at high frequency, causing wear on the inclined plate of the piston cup. Spring 2 presses down to tighten the upper piston cup, and the upper piston cup presses down on the tightening ring. The tightening ring generates a reaction force on the inclined plates of the two piston cups, keeping the inclined plates of the piston cups in sealed contact with the outer arc surface of the piston. The sealing ring 1 is a redundant seal, which increases the sealing effect and improves the sealing performance at the piston position of the high-pressure oil pump body.

[0017] 2. The cross-section of sealing ring three is trapezoidal, which makes the contact area between sealing ring three and safety valve gradually increase after the sealing ring three wears. The highly resilient sealing ring two squeezes sealing ring three, so that the inner arc surface of sealing ring three is always in close contact with safety valve, ensuring the sealing effect at the connection position of the outer shell. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial cross-sectional view of the sealing mechanism of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the clamping assembly of this utility model;

[0021] Figure 4 This is a partial cross-sectional view of the sealing mechanism 2 of this utility model.

[0022] In the diagram: 1. Outer shell, 2. Piston, 3. Spring 1, 4. Sealing mechanism 1, 41. Sealing ring 1, 42. Pressing assembly, 421. Tightening ring, 422. Trapezoidal groove, 423. Spring plate, 43. Leather cup, 44. Gasket 1, 45. Spring 2, 46. Gasket 2, 47. Snap ring, 5. Connecting port, 6. Sealing mechanism 2, 61. Sleeve, 62. Sealing groove, 63. Sealing ring 2, 64. Sealing ring 3. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This embodiment provides a technical solution: a high-pressure oil pump body with good sealing performance, including a housing 1, a sealing mechanism 1 4 and a sealing mechanism 2 6;

[0025] Outer shell 1: Piston 2 is slidably connected inside the piston hole on its rear side. Spring 3 is movably sleeved in the middle of piston 2. Spring 3 is located between the rear side of outer shell 1 and the top plate of piston 2. Connection port 5 is opened on the outer side of outer shell 1.

[0026] Sealing mechanism 4: It includes a pressing assembly 42, a cup 43, and a second spring 45. Two cups 43, symmetrically arranged vertically, are placed inside the piston hole. The outer arc surfaces of the inclined plates of the cups 43 are slidably connected to the outer arc surfaces of the piston 2. A pressing assembly 42 is provided between the two cups 43. A second spring 45 is provided on the upper surface of the upper cup 43. Sealing mechanism 4 also includes a second gasket 46 and a retaining ring 47. The second gasket 46 is placed at the upper end of the piston hole. The upper end of the second spring 45 contacts the lower surface of the second gasket 46. A retaining ring 47 is engaged at the upper end of the piston hole, located above the second gasket 46. Sealing mechanism 4 also... The assembly includes a gasket 44, which is placed on the upper surface of the upper cup 43. The upper surface of the gasket 44 contacts the lower end of the spring 45. The clamping assembly 42 includes a top ring 421, which is placed between the two cups 43. The top ring 421 has a trapezoidal cross-section, and its inner arc surface contacts the inclined plates of the adjacent cups 43. The clamping assembly 42 includes a trapezoidal groove 422 and spring plates 423. The top ring 421 has trapezoidal grooves 422 on both its upper and lower sides. The trapezoidal grooves 422 are filled with evenly distributed spring plates 423. The spring plates 423 are L-shaped. 23 is fixedly connected to the bottom wall of the adjacent trapezoidal groove 422 and the side of the trapezoidal groove 422 near the piston 2 respectively. The sealing mechanism 4 also includes a sealing ring 41. The sealing ring 41 is placed between the bottom wall of the cup 43 and the inclined plate of the cup 43. The outer arc surface of the sealing ring 41 is slidably connected to the outer arc surface of the piston 2. After the second spring 45 is installed, the second gasket 46 is pressed on to compress the second spring 45 and put it in a springback state. Then the retaining ring 47 is installed to prevent the second spring 45 from falling off. The first gasket 44 prevents the second spring 45 from damaging the upper cup 43. When the high-pressure oil pump body is put into use, the piston 2 is in the piston hole The piston 2 slides up and down repeatedly, causing wear on the inclined plate of the cup 43. The second spring 45 rebounds and presses down the upper cup 43. The upper cup 43 presses down the tightening ring 421. The tightening ring 421 generates a reaction force on the inclined plates of the two cups 43, pushing the inclined plates of the cups 43 outward and pressing the piston 2. At the same time, the trapezoidal groove 422 makes the inner side of the tightening ring 421 have a certain elasticity, ensuring that the inner arc surface of the tightening ring 421 is tightly fitted with the inner side of the inclined plates of the two cups 43. The spring plate 423 increases the elasticity of the inner side of the tightening ring 421. The sealing ring 41 is a redundant seal design, which adds another layer of protection to the sealing of the piston 2.

[0027] Sealing mechanism 2 6: It is located on the outside of the connection port 5. Sealing mechanism 2 6 includes a sleeve 61, a sealing groove 62, a second sealing ring 63, and a third sealing ring 64. The sleeve 61 is located on the outside of the connection port 5. The inner arc surface of the sleeve 61 has a sealing groove 62. The second sealing ring 63 and the third sealing ring 64 are placed inside the sealing groove 62. The cross-section of the third sealing ring 64 is trapezoidal. The second sealing ring 63 is located between the side wall of the sealing groove 62 and the outer arc surface of the third sealing ring 64. When installing the safety valve, the lower end of the safety valve is located inside the sleeve 61. The outer arc surface of the lower end of the safety valve fits with the inner arc surface of the third sealing ring 64 to achieve a seal. The safety valve is installed in a threaded form and needs to be screwed into the sleeve 61. This causes some wear to the third sealing ring 64. The second sealing ring 63 has a certain elasticity. The second sealing ring 63 squeezes the third sealing ring 64 inward, so that the inner arc surface of the third sealing ring 64 always keeps in contact with the lower outer arc surface of the safety valve.

[0028] The working principle of the high-pressure oil pump body with good sealing provided by this utility model is as follows: During assembly, each component is installed in its corresponding position. Sealing ring 1 (41) and sealing ring 3 (64) are both nitrile rubber sealing rings, possessing excellent fuel oil resistance. Sealing ring 2 (63) is a natural rubber sealing ring, possessing good resilience. After installing spring 2 (45), gasket 2 (46) is pressed on, compressing spring 2 (45) and placing it in a rebound state. Then, snap ring 47 is installed to prevent spring 2 (45) from falling off. Gasket 1 (44) prevents spring 2 (45) from damaging the upper end of the cup 43. When installing the safety valve, the lower end of the safety valve is located inside the sleeve 61. The outer arc surface of the lower end of the safety valve fits against the inner arc surface of sealing ring 3 (64) to achieve a seal. The safety valve is installed in a threaded form, requiring screwing into the sleeve 61, which causes some wear to sealing ring 3 (64). Sealing ring 2 (63) has… With a certain degree of elasticity, sealing ring 2 63 presses sealing ring 3 64 inward, ensuring that the inner arc surface of sealing ring 3 64 always remains in contact with the lower outer arc surface of the safety valve. When the high-pressure oil pump body is put into use, piston 2 slides up and down repeatedly inside the piston hole, causing wear on the inclined plate of the cup 43. Spring 2 45 rebounds and presses down on the upper cup 43. The upper cup 43 presses down on the tightening ring 421. The tightening ring 421 generates a reaction force on the inclined plates of the two cups 43, pushing the inclined plates of the cups 43 outward and pressing the piston 2. At the same time, the trapezoidal groove 422 provides a certain degree of elasticity to the inner side of the tightening ring 421, ensuring that the inner arc surface of the tightening ring 421 is tightly fitted with the inner side of the inclined plates of the two cups 43. Spring plate 423 increases the elasticity of the inner side of the tightening ring 421. Sealing ring 1 41 is a redundant seal design, adding another layer of protection for the sealing performance of piston 2.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-pressure oil pump body with good sealing performance, characterized in that: It includes a housing (1), a sealing mechanism one (4), and a sealing mechanism two (6); The outer shell (1) has a piston (2) slidably connected inside the piston hole on its rear side. A spring (3) is movably sleeved in the middle of the piston (2). The spring (3) is located between the rear side of the outer shell (1) and the top plate of the piston (2). A connection port (5) is opened on the outer side of the outer shell (1). Sealing mechanism 1 (4): It includes a pressing component (42), a leather cup (43) and a spring 2 (45). Two leather cups (43) are placed inside the piston hole, which are symmetrically distributed vertically. The outer arc surface of the inclined plate of the leather cup (43) is slidably connected to the outer arc surface of the piston (2). A pressing component (42) is provided between the two leather cups (43). A spring 2 (45) is provided on the upper surface of the upper leather cup (43). Sealing mechanism 2 (6): It is located on the outside of the connection port (5).

2. The high-pressure oil pump body with good sealing performance according to claim 1, characterized in that: The sealing mechanism 1 (4) further includes a gasket 2 (46) and a retaining ring (47). The gasket 2 (46) is placed at the upper end of the piston hole. The upper end of the spring 2 (45) contacts the lower surface of the gasket 2 (46). The retaining ring (47) is snapped into the upper end of the piston hole. The retaining ring (47) is located at the upper end of the gasket 2 (46).

3. The high-pressure oil pump body with good sealing performance according to claim 1, characterized in that: The sealing mechanism (4) further includes a gasket (44), which is placed on the upper surface of the upper cup (43), and the upper surface of the gasket (44) is in contact with the lower end of the spring (45).

4. The high-pressure oil pump body with good sealing performance according to claim 1, characterized in that: The clamping assembly (42) includes a clamping ring (421), which is placed between two leather cups (43). The clamping ring (421) has a trapezoidal cross section, and the inner arc surface of the clamping ring (421) contacts the inclined plate of the adjacent leather cup (43).

5. The high-pressure oil pump body with good sealing performance according to claim 4, characterized in that: The clamping assembly (42) includes a trapezoidal groove (422) and a spring plate (423). The top ring (421) has trapezoidal grooves (422) on both the upper and lower sides. The trapezoidal grooves (422) are provided with evenly distributed spring plates (423) inside. The spring plates (423) are L-shaped and are fixedly connected to the bottom wall of the adjacent trapezoidal grooves (422) and the side of the trapezoidal grooves (422) near the piston (2).

6. The high-pressure oil pump body with good sealing performance according to claim 1, characterized in that: The sealing mechanism (4) further includes a sealing ring (41). The sealing ring (41) is placed between the bottom wall of the leather cup (43) and the inclined plate of the leather cup (43). The outer arc surface of the sealing ring (41) is slidably connected to the outer arc surface of the piston (2).

7. The high-pressure oil pump body with good sealing performance according to claim 1, characterized in that: The second sealing mechanism (6) includes a sleeve (61), a sealing groove (62), a second sealing ring (63) and a third sealing ring (64). The sleeve (61) is provided on the outside of the connection port (5). The inner arc surface of the sleeve (61) is provided with a sealing groove (62). The second sealing ring (63) and the third sealing ring (64) are placed inside the sealing groove (62). The cross-section of the third sealing ring (64) is trapezoidal. The second sealing ring (63) is located between the side wall of the sealing groove (62) and the outer arc surface of the third sealing ring (64).

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