Hydraulic system high and low pressure compound on-line circulation flushing and pressure testing device

Abstract

The invention discloses a high / low-pressure composite online circulating flushing and pressure testing device for a hydraulic system. A first ball valve and a second ball valve are connected in series, the input end of the first ball valve is connected with an oil tank, the output end of the first ball valve is connected with an input end of a large-flow low-pressure screw type flushing pump, the output end of the second ball valve is connected with an input end of a small-flow high-pressure plunger type flushing pump, the output end of the small-flow high-pressure plunger type flushing pump is connected with a high-pressure one-way valve and a high-pressure outlet ball valve in sequence in series, a high-pressure overflow valve is connected with the output end of the high-pressure one-way valve and the oil tank, a filter is connected with a low-pressure return oil ball valve and the oil tank, a high-pressure bypass ball valve is connected with the output end of the high-pressure one-way valve and the input end of the filter, the output end of the large-flow low-pressure screw type flushing pump is connected with a spiral check valve and a low-pressure outlet ball valve in sequence in series, and a low-pressure bypass ball valve is connected with the output end of the spiral check valve and the input end of the filter. Flushing and pressure testing can be performed conveniently for the hydraulic system, requirements for large-flow low-pressure flushing, small-flow high-pressure flushing and pressure testing can be satisfied, the efficiency of flushing and pressure testing of the hydraulic system can be improved, and the cost can be reduced.

Description

technical field [0001] The invention relates to a high-low pressure composite online circulation flushing and pressure testing device for a hydraulic system. Background technique [0002] With the continuous increase of modern industrial automation, the precision and sensitivity of hydraulic transmission control are getting higher and higher, so the hydraulic servo proportional system with high sensitivity and high precision is widely used. The pipeline as the conveying medium in the hydraulic system is like the blood vessels of the human body. The quality of its construction and installation and the cleanliness of the pipeline directly affect the sensitivity and accuracy of the hydraulic system, and even directly affect the normal operation of the hydraulic system. [0003] The hydraulic system needs to be flushed after the construction is completed. The traditional flushing device can only provide large flow and low pressure and cannot meet the high pressure requirements, ...

AI Technical Summary

Problems solved by technology

However, when the flushing workload is very large, the pipe diameter is small, the path is long, and the pipelines A and B behind the valve table have large resistance along the way, the flow supplied by the flushing device will be surplus, and the supply pressure cannot meet the requirements of system flushing. (The flushing pressure is generally required to reach 4-12 MPa), so the flushing quality of the system cannot be guaranteed

[0006] Small flow rate (600L / min) and low pressure (up to 1.6MPa) flushing device flushing main flow is insufficient, when flushing the A and B pipes from behind the valve table to the front of the actuator, the pressure is insufficient in most cases, which cannot meet the requirements of system flushing

[0007] Large flow rate (1000L / min) and high pressure (maximum 16MPa) flushing device flushes the flow of A and B pipes after the valve table; the flushing pressure can meet the working conditions, but the volume of the flushing device is too large, so that it often exceeds the volume of the original system pumping station. On-site transportation, lifting, disassembly and assembly are extremely inconvenient, and even the washing site is often unable to be placed; and the electrical control system is complex, the equipment is easily damaged, the power of the washing device is too large, and the conventional construction power supply cannot be used to start the washing pump at the same time. , maintenance and other costs are extremely high, energy consumption is large, and pressure testing is inconvenient

[0008] The large-flow low-pressure flushing device and the large-flow high-pressure flushing device solve the problem of pipeline online circulation flushing, and can ensure the cleanliness of the pipeline to meet the requirements of NAS7 level, but it is difficult to guarantee the cleanliness requirement of NAS5 level for the hydraulic proportional servo system , often need to be realized through long-term flushing, which is time-consuming and labor-intensive, and increases energy consumption

[0009] Therefore, the traditional flushing device cannot meet the needs of modern construction with fast pace, short construction period, low labor intensity and low cost.

And it is impossible or inconvenient to meet the pressure test inspection of the hydraulic system. In the case of not using the hydraulic system pump for system pressure test, it is necessary to install another pressure test device for pressure test, which increases the construction cost of the system and reduces the system pressure. construction efficiency

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