Common-rail pipe pressure-limiting valve matching element pressure-holding stroke detecting device and measuring method

Abstract

The invention provides a common-rail pipe pressure-limiting valve matching element pressure-holding stroke detecting device. The detecting device comprises a workbench. A valve seat positioning body is fixed to the workbench. The valve seat positioning body is internally provided with an airway of which one end is connected to an air inlet interface of the valve seat positioning body and the other end is connected to an orifice of a pressure limiting valve seat fixed to the valve seat positioning body. A flow meter is connected to the air inlet interface. The valve seat positioning body is provided with a sealing ring at the part contacting the pressure limiting valve seat. The pressure limiting valve seat is fixed to the valve seat positioning body through a fastener. A column is fixed to the workbench, a displacement measurer is fixed to the column, and a measuring rod of the displacement measurer presses a pressure limiting valve core. Further, the fastener used to fix the pressure limiting valve seat to the valve seat positioning body is a tightening cap. Further, the top of the valve seat positioning body is provided with a positioning groove, and the pressure limiting valve seat is assembled in the positioning groove. The pressure-holding stroke of a pressure-limiting valve matching element can be measured quantitatively, and the measuring method is simple, efficient, accurate and reliable.

Description

technical field [0001] The invention relates to an internal combustion engine system, in particular to a detection device for a pressure-limiting valve pair of a common rail pipe. Background technique [0002] The structure of the pressure limiting valve couple is as follows figure 1 As shown, it includes a valve seat 5 and a valve core 6, both of which form a mating couple. The sealing surface of the end 61 of the valve core 6 and the valve seat 5 is sealed with a tapered surface. The peripheral surface of the stem 62 in the middle of the spool 6 has flat side surfaces 63 (crossed out parts in the figure, one at the front and the back respectively). The spool 6 can be pressed down with a spring so that the spool 6 presses the valve seat 5. The bottom of the valve seat 5 has an orifice 51 . Fuel with a certain pressure exerts upward pressure on the spool 6 from the orifice 51. When the pressure is too high, the spool 6 moves upward. When the top of the flat side 63 on th...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a detection device for the pressure-holding stroke of the common rail pressure limiting valve couple, and solve the problem of how to measure the pressure-holding stroke of the common rail pressure limiting valve couple Technical problem, judging whether the pressure-holding stroke of the pressure-limiting valve pair is qualified through the change of gas flow rate, the measurement method is simple, efficient and reliable

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