Constant-pressure backflow preventing device for preheating system of diesel engine

Abstract

The invention relates to the technical field of diesel engine preheating system components, in particular to a constant-pressure backflow prevention device for a diesel engine preheating system, which comprises an oil hole inlet a2 flowing into a constant-pressure valve body 1 from a fine filter, the oil hole inlet a2 is communicated with an oil hole outlet b21, the oil hole outlet b21 is communicated with an electromagnetic valve, and the electromagnetic valve is communicated with an oil hole inlet c22 of the constant-pressure valve body 1 through an oil pipe. The oil hole inlet c22 is communicated with the anti-backflow valve 4, the anti-backflow valve 4 is communicated with the oil hole outlet d23, the constant-pressure valve body 1 is integrally formed in a sealed mode, and the anti-backflow valve 4, the damping hole bolt 3, a plurality of oil hole inlets and a plurality of oil hole outlets are arranged in the constant-pressure valve body 1. The diesel oil cleanliness tolerance is high, the pressure stabilizing and flow limiting functions of a constant-pressure backflow preventing device in a preheating system are improved, and the working time and the service life of a flame jet type preheater system are prolonged.

Description

technical field [0001] The invention relates to the technical field of diesel engine preheating system components, in particular to a constant pressure backflow prevention device used in a diesel engine preheating system. Background technique [0002] The flame preheating system is an important system for the cold start of the diesel engine. The diesel engine belongs to the compression ignition engine and has no spark plug ignition. When the diesel engine is cold started, the initial speed of the diesel engine crankshaft is low, and the diesel is easy to condense. Therefore, during the cold start, it is difficult for the gas entering the cylinder to rise to the self-ignition temperature, and a preheating device is required to increase the intake air temperature. At present, the main preheating devices of diesel engines are electric heating wire type preheater and flame jet type preheater, and the invention is applied to the diesel fuel supply pipeline of the flame jet type p...

AI Technical Summary

Problems solved by technology

For example, Chinese Invention Patent Application No. 202022250103.7 discloses a constant pressure stabilization device for a diesel engine preheating system, which uses an anti-backflow check valve, which has the following disadvantages in the preheating system: 1. The diesel engine preheating system pipeline uses a constant pressure stabilizer After the pressure stabilization device is screwed into the installation position by the thread, it is sealed by the O-ring. However, with the shock of the pressure and the vibration of the engine during work, the thread becomes loose, causing the O-ring to move and lose the reverse sealing performance.

2. The existing anti-backflow check valve is a traditional steel ball spring structure with a narrow space and a compact and complex structure. Since the rear end of the anti-backflow check valve is connected to the diesel oil tank, a small amount of impurities may be mixed in the diesel oil, which can easily block the steel ball and lose its function.

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