Front-mounted pump pressure range protecting circuit without overflow valve
A technology to protect the circuit and pressure range, which is applied in the directions of fluid pressure actuation device, fluid pressure actuation system safety, servo meter circuit, etc. Problems such as difficulty in flow valve selection, etc., to achieve the effect of easy heating, simple design, safety, reliability and cost performance
Pending Publication Date: 2017-11-07
DALIAN DESIGN INST CO LTD CHINA FIRST HEAVY IND +1
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AI Technical Summary
Problems solved by technology
The existing problems are firstly that it is difficult to select the overflow valve with a large flow rate change, and it is difficult to choose a suitable valve, and it is expensive; secondly, once the valve fails, the pressure at the suction port of the main pump will rise sharply, exceeding Rated pressure at pump suction, damage to main pump
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Embodiment Construction
[0018] Such as figure 1 As shown, the pre-pump pressure range protection circuit suitable for canceling the overflow valve includes 1~n parallel-connected pre-pumps 1 driven by motors and 1-n parallel-connected main working pumps driven by motors 4. When the front pump 1 and the main working pump 4 are single, one end of the front pump 1-1 is connected to the pressure oil tank 3 through the pipe i-5 and also connected to the lower end of the main working pump 4 through the pipe v-10, the front pump 1 The other end of -1 is connected with the bottom of main oil tank 7 via pipe ii-6. When there are multiple front pumps 1, the lower part of the main oil tank 7 is connected to one end of the front pump 1-n through the pipe iii-8. The other end of the front pump 1-n is connected to the lower end of the main working pump 4 through the pipe iv-9, and the oil supply pipe 11 is drawn from the top of the working pump 4. It is characterized in that: the connecting pipe between the fron...
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The invention discloses a front-mounted pump pressure range protecting circuit without an overflow valve. The front-mounted pump pressure range protecting circuit comprises front-mounted pumps and main working pumps; when one front-mounted pump and one main working pump are arranged, one end of the front-mounted pump is connected with a pressure oil tank through a pipe i and connected with the lower end of the main working pump through a pipe v, the other end of the front-mounted pump is connected with the lower portion of a main oil tank through a pipe ii, and an oil supply pipe is led out from the upper portion of the main working pump; and when multiple front-mounted pumps are arranged, a pipe iii and a pipe iv are additionally arranged in front of and behind the front-mounted pumps respectively. The front-mounted pump pressure range protecting circuit is characterized in that a damper is additionally arranged on the connecting pipe ii between the front-mounted pumps and the pressure oil tank, and the damping numerical range conforms to the numerical range required by a pump sample. According to the technical scheme, the technical problems that due to the fact that the overflow valve is arranged in an existing circuit, type selection is difficult, the cost is high, heating is liable to occur, and the main pump is likely to be damaged due to the fact that the pressure rises once the overflow valve is failed are solved. The front-mounted pump pressure range protecting circuit is simple in structure, safe and reliable and provides a safety guarantee for the bearing pressure of a suction inlet of the main pump.
Description
technical field [0001] The invention relates to a hydraulic system protection circuit suitable for canceling an overflow valve. Background technique [0002] In a large-flow hydraulic system, in order to ensure good suction performance of the main working pump and prolong the service life of the pump, a pre-pump is usually installed at the suction port of the main working pump, and the pre-pump supplies oil to the suction port of the main working pump. When the number of main working pumps changes due to different working conditions, the oil flow supplied by the front pump to the main pump changes within a certain range, and the excess flow needs to be overflowed. The traditional conventional design is to consider setting a relief valve at the outlet of the pre-pump to stabilize the outlet pressure. The existing problems are firstly that it is difficult to select the overflow valve with a large flow rate change, and it is difficult to choose a suitable valve, and it is expe...
Claims
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IPC IPC(8): F15B20/00
CPCF15B20/00F15B2211/875F15B2211/20576
Inventor 张景胜胡英李德飞康宏志
Owner DALIAN DESIGN INST CO LTD CHINA FIRST HEAVY IND