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CN-224214286-U - High-pressure oil pump body with good sealing performance

CN224214286UCN 224214286 UCN224214286 UCN 224214286UCN-224214286-U

Abstract

The utility model discloses a high-pressure oil pump body with good sealing performance, which comprises a shell, a first sealing mechanism and a second sealing mechanism, wherein a piston is connected inside a piston hole at the rear side of the shell in a sliding manner, a first spring is movably sleeved in the middle of the piston, the first spring is positioned between the rear side of the shell and a top plate of the piston, a connecting port is formed in the outer side of the shell, the first sealing mechanism comprises a pressing component, leather cups and a second spring, two leather cups which are symmetrically distributed up and down are arranged inside the piston hole, the outer cambered surfaces of inclined plates of the leather cups are in sliding connection with the outer cambered surfaces of the piston, the pressing component is arranged between the two leather cups, a second spring is arranged on the upper surface of the leather cup at the upper end of the sealing mechanism, the second sealing mechanism further comprises a second gasket and a clamp spring, and the high-pressure oil pump body with good sealing performance seals the connecting position of the piston and a safety valve in a dynamic compensation manner, so that the sealing performance is improved.

Inventors

  • ZHAO HONGFENG

Assignees

  • 富顺安建汽车零部件(东莞)有限公司

Dates

Publication Date
20260508
Application Date
20250620

Claims (7)

  1. 1. The high-pressure oil pump body with good sealing performance is characterized by comprising a shell (1), a first sealing mechanism (4) and a second sealing mechanism (6); The piston hole at the rear side of the shell (1) is internally and slidably connected with a piston (2), the middle part of the piston (2) is movably sleeved with a first spring (3), the first spring (3) is positioned between the rear side surface of the shell (1) and the top plate of the piston (2), and a connecting port (5) is formed in the outer side of the shell (1); The sealing mechanism I (4) comprises a pressing component (42), leather cups (43) and a spring II (45), wherein the two leather cups (43) which are vertically and symmetrically distributed are arranged in the piston hole, the outer cambered surfaces of the inclined plates of the leather cups (43) are both in sliding connection with the outer cambered surfaces of the pistons (2), the pressing component (42) is arranged between the two leather cups (43), and the spring II (45) is arranged on the upper surface of the leather cup (43) at the upper end; And a second sealing mechanism (6) which is arranged outside the connecting port (5).
  2. 2. The high-pressure oil pump body with good sealing performance according to claim 1, wherein the first sealing mechanism (4) further comprises a second gasket (46) and a clamp spring (47), the second gasket (46) is arranged at the upper end of the piston hole, the upper end of the second spring (45) is in contact with the lower surface of the second gasket (46), the clamp spring (47) is clamped at the upper end of the piston hole, and the clamp spring (47) is located at the upper end of the second gasket (46).
  3. 3. A pump body of a high-pressure oil pump with good sealing performance according to claim 1, wherein the first sealing mechanism (4) further comprises a first gasket (44), the first gasket (44) is arranged on the upper surface of a leather cup (43) at the upper end, and the upper surface of the first gasket (44) is contacted with the lower end of a second spring (45).
  4. 4. The high-pressure oil pump body with good sealing performance according to claim 1, wherein the pressing assembly (42) comprises a pressing ring (421), the pressing ring (421) is arranged between two leather cups (43), the cross section of the pressing ring (421) is trapezoid, and the intrados of the pressing ring (421) is respectively contacted with the inclined plates of the adjacent leather cups (43).
  5. 5. The high-pressure oil pump body with good sealing performance according to claim 4, wherein the pressing assembly (42) comprises trapezoid grooves (422) and spring pieces (423), the trapezoid grooves (422) are formed in the upper side and the lower side of the pressing ring (421), the uniformly distributed spring pieces (423) are arranged in the trapezoid grooves (422), the spring pieces (423) are L-shaped, and the spring pieces (423) are fixedly connected between the bottom wall of each adjacent trapezoid groove (422) and one surface, close to the piston (2), of each trapezoid groove (422).
  6. 6. The high-pressure oil pump body with good sealing performance according to claim 1, wherein the first sealing mechanism (4) further comprises a first sealing ring (41), the first sealing ring (41) is arranged between the bottom wall of the leather cup (43) and the inclined plate of the leather cup (43), and the outer cambered surfaces of the first sealing ring (41) are in sliding connection with the outer cambered surfaces of the pistons (2).
  7. 7. The high-pressure oil pump body with good sealing performance according to claim 1, wherein the second sealing mechanism (6) comprises a sleeve (61), a sealing groove (62), a second sealing ring (63) and a third sealing ring (64), the sleeve (61) is arranged on the outer side of the connecting port (5), the sealing groove (62) is formed in the inner cambered surface of the sleeve (61), the second sealing ring (63) and the third sealing ring (64) are arranged in the sealing groove (62), the section of the third sealing ring (64) is trapezoid, and the second sealing ring (63) is located between the side wall of the sealing groove (62) and the outer cambered surface of the third sealing ring (64).

Description

High-pressure oil pump body with good sealing performance Technical Field The utility model relates to the technical field of high-pressure oil pump bodies, in particular to a high-pressure oil pump body with good sealing performance. Background The high-pressure oil pump is a core component of a fuel injection system, is mainly used for a diesel engine or a direct injection gasoline engine in a cylinder, and has the function of pressurizing fuel to high pressure of tens to hundreds of megapascals and delivering the fuel to an oil injector through a common rail pipe. The device is generally composed of a plunger, a cam driving mechanism, an oil inlet and outlet valve and a sealing assembly, and the plunger is driven to reciprocate by a cam shaft during operation, so that fuel oil is compressed and boosted in a closed cavity. Modern high-pressure oil pumps are controlled electronically (such as piezoelectric or electromagnetic valve adjustment), so that the oil supply pressure and flow can be accurately adjusted, and the requirements of different working conditions are met. The plunger position of high-pressure oil pump usually adopts the leather cup of high wearability to seal, but the leather cup still can be worn and torn down for a long time operation, and the gap appears in the contact surface of leather cup and plunger, and leakproofness greatly reduced to the relief valve protection pump body can be installed to the pump body of high-pressure oil pump, and the relief valve is threaded installation, seals through the cone screw thread, and sealed effect is limited under the high pressure environment, for this reason, we propose a high-pressure oil pump body that leakproofness is good. Disclosure of utility model The utility model aims to overcome the existing defects, and provides the high-pressure oil pump body with good sealing performance, the connecting position of the piston and the safety valve is sealed in a dynamic compensation mode, the sealing performance is improved, and the problems in the background technology can be effectively solved. In order to achieve the aim, the utility model provides the technical scheme that the high-pressure oil pump body with good sealing performance comprises a shell, a first sealing mechanism and a second sealing mechanism; The piston hole at the rear side of the shell is internally connected with a piston in a sliding way, the middle part of the piston is movably sleeved with a first spring, the first spring is positioned between the rear side surface of the shell and the top plate of the piston, and the outer side of the shell is provided with a connecting port; The sealing mechanism I comprises a pressing component, a leather cup and a spring II, wherein the leather cup which is vertically and symmetrically distributed is arranged in the piston hole, the outer cambered surface of the inclined plate of the leather cup is in sliding connection with the outer cambered surface of the piston, the pressing component is arranged between the two leather cups, and the spring II is arranged on the upper surface of the leather cup at the upper end; and the second sealing mechanism is arranged at the outer side of the connecting port and seals the connecting position of the piston and the safety valve in a dynamic compensation mode, so that the sealing performance is improved. Further, the first sealing mechanism further comprises a second gasket and a clamp spring, the second gasket is arranged at the upper end of the piston hole, the upper end of the second spring is in contact with the lower surface of the second gasket, the clamp spring is clamped at the upper end of the piston hole, and the clamp spring is located at the upper end of the second gasket and compresses the leather cup. Further, the first sealing mechanism further comprises a first gasket, the first gasket is arranged on the upper surface of the leather cup at the upper end, and the upper surface of the first gasket is contacted with the lower end of the second spring to protect the leather cup. Further, the pressing assembly comprises a pressing ring, the pressing ring is arranged between two leather cups, the section of the pressing ring is trapezoid, the inner cambered surfaces of the pressing ring are respectively contacted with the inclined plates of the adjacent leather cups, and the inclined plates of the leather cups are pressed. Further, compress tightly the subassembly and include dovetail groove and spring leaf, the dovetail groove has all been seted up to the upper and lower both sides of top tight circle, and the inside in dovetail groove all is provided with evenly distributed's spring leaf, and the spring leaf is the L type, and the spring leaf is fixed connection respectively between the diapire in adjacent dovetail groove and the one side that dovetail groove is close to the piston, improves the rebound effect. Further, the first sealing mechanism further comprises a first sealing rin