Plunger type high-pressure pump and high-pressure assembly and plunger sleeve of plunger type high-pressure pump

Abstract

The invention provides a plunger type high-pressure pump (100). The plunger type high-pressure pump (100) comprises a pump shell (20), and a high-pressure assembly containing cavity (201) and a cam shaft cavity (202) are formed in the pump shell (20); a high-pressure assembly (30) is arranged in the high-pressure assembly containing cavity (201), and a cam shaft (40) is arranged in the cam shaft cavity (202) and can drive the high-pressure assembly (30) for carrying out pressurization through a cam driven device (50); and the plunger type high-pressure pump (100) is characterized in that the high-pressure assembly (30) comprises a plunger sleeve (31) fixedly arranged in the high-pressure assembly containing cavity (201), a plunger chamber (311) arranged in the plunger sleeve (31), a plunger (32) capable of moving in the plunger chamber (311) in a reciprocating mode and a valve assembly (33) arranged in a valve cavity (312) in the plunger sleeve (31), the plunger chamber (311) communicates with the valve cavity (312), a sealing element containing chamber (314) is arranged on the plunger sleeve (31), a plunger sealing element (34) is arranged in the sealing element containing chamber(314) so as to provide seal between the plunger (32) and the plunger sleeve (31), the plunger sleeve (31) is further provided with an oil drainage channel (315), one end of the oil drainage channel (315) communicates with the sealing element containing chamber (314), and the other end of the oil drainage channel (315) communicates with the outside of the plunger type high-pressure pump (100).

Description

technical field [0001] The invention relates to a high-pressure pump, in particular to a plunger-type high-pressure pump, its high-pressure assembly, and a plunger sleeve. Background technique [0002] The plunger-type high-pressure pump is widely used in the field of high-pressure fuel pumps. The plunger-type high-pressure pump pushes the plunger through the camshaft to pressurize the fuel in the plunger cavity, and controls the supply of high-pressure fuel to the outside through the control valve. [0003] see figure 1 and figure 2 Shown is a schematic diagram of the basic structure of the plunger-type high-pressure pump in the prior art. The plunger type high-pressure pump 900 includes a housing 90 , and a high-pressure assembly chamber 901 and a camshaft chamber 902 are opened in the housing 90 , and the high-pressure assembly chamber 901 communicates with the camshaft chamber 902 . The camshaft 92 is arranged in the camshaft chamber 902 , and the high-pressure assem...

AI Technical Summary

Problems solved by technology

[0005] However, since the plunger seal 913 is generally made of plastic material, dust may form when the plunger 911 rubs against it at high speed, and dust may form if the temperature of the oil storage tank 916 is too high when the oil storage tank 916 rubs against it at high speed. The distance between the oil groove 916 and the plunger seal 913 is relatively long, so the cooling effect of the fuel on the plunger seal 913 is limited

In addition, the existence of the plug will also make the processing and parts complicated.

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