Novel structure low-temperature pump

Abstract

The invention belongs to the technical field of fuel supply for internal combustion engines, and in particular, relates to a novel structure low-temperature pump. The novel structure low-temperature pump comprises a cold end area, an air-state cooling area and a hot end area; the air-state cooling area is arranged between the cold end area and the hot end area; the cold end area comprises a cold end pump body and a vacuum insulation cover; a cold end piston is arranged in the cold end pump body; the end part of the cold end piston is designed in a ring groove opening form; the head part of a cold end connecting rod is mounted in a piston opening ring groove; the hot end area comprises a hot end piston; the hot end piston is mounted in a hot end pump body; a pressure relief device is arranged on the hot end piston; a displacement sensor is arranged on the hot end pump body; and a high-pressure air pipe is arranged in the air-state cooling area. The novel structure low-temperature pump has the following beneficial effects: liquefied natural gas in a low-temperature tank can be totally pumped out to improve the vehicle endurance; the structure is simple and effective; the reliabilityis improved; the machining manufacturability is excellent; and the batch production is convenient.

Description

technical field [0001] The invention belongs to the technical field of fuel supply for internal combustion engines, and in particular relates to a low-temperature pump with a new structure. Background technique [0002] In the current market, among internal combustion engine vehicles that use natural gas as fuel, natural gas is carried on the vehicle in two ways: compressed natural gas (CNG) and liquefied natural gas (LNG). Compressed natural gas (CNG) is gaseous natural gas at high pressure, usually one volume of compressed natural gas is converted to 200 standard volumes of natural gas. Liquefied natural gas (LNG) is natural gas in liquid form, usually one volume of LNG is converted into 600 standard volumes of natural gas. CNG vehicles have insufficient continuous driving ability and are suitable for small vehicles such as taxis. Compared with CNG vehicles, the continuous driving capacity of LNG vehicles is greatly increased, and medium and heavy trucks also have enough...

AI Technical Summary

Problems solved by technology

Existing reciprocating piston cryopumps have many defects: the connecting rod of the cryopump is long, and the two ends of the cryopump are connected to the piston through a threaded structure, which is easy to cause stagnation or even jamming during movement; the inside of the cryopump passes through the cone Or flat seal, the sealing surface is easy to leak; the driving end is directly connected to the cold end through ordinary metal parts, and the heat leakage is serious; the carburetor needs to pass the engine coolant during heat exchange, and after a period of use, there will be gas inside the carburetor. Scale cannot be cleaned and maintained; when the piston moves, the displacement cannot be accurately monitored, resulting in piston impact failure, etc.

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