A liquid flow go-stop gauge

Abstract

The invention discloses a liquid flow go-no go gauge, which comprises an energy storage device, a safety valve, an upper limit flow limiter, a lower limit flower limiter, a left stop valve, a right stop valve, an upper pressure sensor, a flow limiter to be detected, a lower pressure sensor and a flow regulation valve, wherein the safety valve is communicated with the energy storage device; the left stop valve is communicated with the energy storage device after being connected in series with the upper limit flow limiter; the right stop valve is communicated with the energy storage device after being connected in series with the lower limit flow limiter; the upper end of the upper pressure sensor is simultaneously communicated with the left stop valve and the right stop valve, and the lower end of the upper pressure sensor is connected with the oil inlet end of the flow limiter to be detected; the oil outlet end of the flow limiter to be detected is connected with the lower pressure sensor; the lower pressure sensor is communicated with the flow regulation valve. The liquid flow go-no go gauge is simple in structure, low in construction cost, economical and practical, all flow limiters can be detected on line, the detection cost can be lowered, and a judgment method is simple and direct; meanwhile, a system can run under lower pressure, difficulty in implementation is greatly lowered, and the safety is greatly improved.

Description

Technical field: [0001] The invention relates to a flow limiting valve in a high-pressure common rail system of a diesel engine, in particular to a rapid detection device for accurately and simply detecting the flow rate of the flow limiting valve. Background technique: [0002] With the development of the national economy, automobiles have entered ordinary families in China. At present, the number of civilian automobiles has exceeded 12 million, of which diesel vehicles account for a large proportion; Energy saving and emission reduction indicators put forward higher requirements. At present, my country has begun to implement the National IV emission standards and new fuel standards, requiring the fuel supply system to provide diesel engines with precisely timed and quantitative fuel in a higher pressure and more flexible manner, which means that the old mechanical fuel injection The system can no longer meet the new requirements. At the same time, the advantages of the di...

AI Technical Summary

Problems solved by technology

[0007] First, the investment in testing equipment is large, and the cost of testing is high. The value of a single fuel injection gauge alone is more than 300,000 yuan, and it cannot meet the requirements of online testing in the mass production process;

[0008] Second, a special high-flow common rail injector 13 is used as an indirect measurement device. Due to the need for continuous start and stop during the test, the loss of the injector 13 is serious. Because the value of the common rail injector 13 itself is relatively high, about 2000 Yuan / piece, so the use cost is too high;

[0009] Third, after the fuel injector 13 is used for a long time, the fuel injection characteristics of the fuel injector 13 will change, and the return flow will increase, resulting in inaccurate test results;

[0010] Fourth, since the fuel injector 13 is used as the flow regulating device, the system needs to maintain a high pressure to ensure that the instantaneous flow of the fuel injector 13 meets the closing requirements of the restrictor 8, and the system safety factor is low

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