A novel variable pressure differential load sensing system for quantitative pump and its control method

A technology of load sensitivity and control method, which is applied in the direction of fluid pressure actuators, servo motors, servo motor components, etc., can solve the problems of large heat dissipation, large overflow loss of quantitative pump system, high set value, etc., and achieve reduction The effect of heat dissipation, reduction of overflow loss, and improvement of energy saving

Active Publication Date: 2022-08-05
XUZHOU HEAVY MASCH CO LTD
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  • Abstract
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Problems solved by technology

[0008] The main problem of the above method is: in order to compensate the pressure loss along the pipeline caused by the maximum flow rate, the load sensing valve ΔP needs to be set at a higher pressure, that is, the constant pressure difference is generally set at a higher value, which makes the state (non-working state), the quantitative pump system has a large overflow loss, resulting in a large amount of heat dissipation

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  • A novel variable pressure differential load sensing system for quantitative pump and its control method

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Embodiment 1

[0034] like figure 1 As shown, a new type of variable pressure differential load sensing system for quantitative pump includes load sensing valve 3, safety protection valve 4, pressure compensator 5, first reversing valve 6 and differential pressure control valve 8, load sensing valve 3, safety valve The oil inlet ends of the protection valve 4 and the pressure compensator 5 are both connected to the oil inlet, the load sensitive valve 3 is respectively connected to the differential pressure control mechanism 2 and the safety protection valve 4, and the pressure compensator 5 is connected to the first reversing valve 6;

[0035] The differential pressure control valve 8 includes a damping hole 1 , a differential pressure control mechanism 2 and a second reversing valve 7 . The differential pressure control mechanism 2 is connected to the second reversing valve 7 , and the differential pressure control mechanism 2 is connected to the second reversing valve 7 . There is a dampin...

Embodiment 2

[0045] like figure 1 As shown, a new type of variable pressure differential load sensing system for quantitative pump includes load sensing valve 3, safety protection valve 4, pressure compensator 5, first reversing valve 6 and differential pressure control valve 8, load sensing valve 3, safety valve The oil inlet ends of the protection valve 4 and the pressure compensator 5 are both connected to the oil inlet, the load sensitive valve 3 is respectively connected to the differential pressure control mechanism 2 and the safety protection valve 4, and the pressure compensator 5 is connected to the first reversing valve 6;

[0046] The differential pressure control valve 8 includes a damping hole 1 , a differential pressure control mechanism 2 and a second reversing valve 7 . The differential pressure control mechanism 2 is connected to the second reversing valve 7 , and the differential pressure control mechanism 2 is connected to the second reversing valve 7 . There is a dampin...

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Abstract

The invention discloses a novel variable pressure differential load sensing system of a quantitative pump, comprising a load sensing valve, a safety protection valve, a pressure compensator, a first reversing valve, a differential pressure control valve, a load sensing valve, a safety protection valve and a pressure compensation valve The oil inlet end of the compensator is connected to the oil inlet, the load sensitive valve is respectively connected with the differential pressure control mechanism and the safety protection valve, the pressure compensator is connected with the first reversing valve, and the differential pressure control valve includes a damping hole and a differential pressure control mechanism. and the second reversing valve, the differential pressure control mechanism is connected with the second reversing valve, and a damping hole is arranged between the differential pressure control mechanism and the second reversing valve; The pressure difference of the valve realizes that the flow output is related to the actual demand of the system. Through the variable pressure difference, the overflow loss of the system in the standby state is reduced, thereby improving the energy saving of the system.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection of cranes, and in particular relates to a novel variable pressure differential load sensing system of a quantitative pump and a control method thereof. Background technique [0002] The load-sensing system of the quantitative pump has good energy-saving characteristics and stability, and has been widely used in the hydraulic system of cranes. At present, the method of constant pressure difference control is used, and the pressure difference ΔP of the system is set through the load-sensing valve. When the system is working , so that the pump outlet pressure is always higher than the load pressure by ΔP, so as to achieve adaptive matching between the system pressure and the load pressure. [0003] In the prior art, the commonly used method is the method of constant pressure difference control, and the control principle is: [0004] (1) In the standby state, the hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/05F15B13/02F15B13/04
CPCF15B11/05F15B13/02F15B13/026F15B13/0407F15B2211/20538F15B2211/505
Inventor 杜建西焦国旺张中征
Owner XUZHOU HEAVY MASCH CO LTD
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