Testing device for jetting precision of jet pump

Abstract

The invention discloses a testing device for the jetting precision of a jet pump. The testing device comprises a shell, an expansion body separator and a real-time reader. Scales are arranged on the side wall of the shell, an inner pipe stretching into the shell is arranged on the side wall of the bottom end of the shell, a liquid inlet pipe used for being connected with a jetting pipe of the jet pump is arranged on the outer side of the inner pipe, and a gas-liquid outlet and a liquid backflow port are formed in the top end of the shell. The expansion body separator is arranged at the top end of the shell and comprises a spherical outer shell and a spherical inner shell. A discharging port is formed in the outer wall of the spherical outer shell, and the spherical outer shell communicates with the liquid backflow port. The spherical inner shell is fixedly arranged in the spherical outer shell, a plurality of radial spraying pipes are arranged on the circumferential wall of the spherical inner shell and are aligned with the inner wall of the spherical outer shell, and the gas-liquid outlet penetrates the spherical outer shell and communicates with the spherical inner shell. The real-time reader is used for reading the volume variation of liquid in the shell in real time through a differential pressure sensor. The testing device can accurately detect the jetting precision under different jetting flow degrees.

Description

technical field [0001] The invention relates to the field of precision testing of jet pumps, in particular to a testing device for jetting precision of jet pumps. Background technique [0002] The accuracy test of the existing SCR (Selective Catalytic Reduction, selective catalytic reduction technology) urea injection pump is to unplug the injection pipe, then put it into a designated container to collect the urea solution, and finally weigh it on a micro balance. Compare the weighing result with the set pump injection volume, and finally draw the conclusion of the injection accuracy of the pump. [0003] The main shortcoming that prior art scheme exists: [0004] 1. The testing process is cumbersome, requiring continuous collection and weighing of urea. [0005] 2. During the test, due to the gas-assisted injection system, it is difficult to ensure that the urea escapes from the temporary collection container, or there will inevitably be urea dripping during the test, res...

AI Technical Summary

Problems solved by technology

[0004] 1. The test process is cumbersome and requires continuous collection and weighing of urea

[0005] 2. During the test, due to the gas-assisted injection system, it is difficult to ensure that the urea escapes from the temporary collection container, or there will inevitably be urea dripping during the test, resulting in insufficient measurement accuracy

[0006] 3. The test accuracy of the balance itself or air disturbance, or foreign objects are likely to cause errors

[0007] 4. There is a time difference in the process of repeated plugging and unplugging, which will also lead to test errors

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