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Throttle loop

A circuit and oil return port technology, applied in the hydraulic field, can solve problems such as too sensitive adjustment and unfavorable system stability

Active Publication Date: 2012-07-04
ZOOMLION HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] According to formula (6), the larger the diameter of the selected throttle valve, that is, the larger the w, the larger the derivative value when it is adjusted to the vicinity of the maximum pressure. The gain will cause the adjustment to be too sensitive, which is not conducive to the stability of the system

Method used

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Examples

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Embodiment Construction

[0051] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0052] Such as figure 1 As shown, a throttling circuit is provided according to an embodiment of the present invention, wherein the throttling circuit includes a first working port A, a second working port B, a directional flow control valve 1 and four on-off valves 21, 22, 23, 24, the first working port A communicates with the pressure oil port 1P of the directional flow control valve 1, and the four on-off valves 21, 22, 23, 24 are connected in series between the first working port A and the directional flow control valve 1 respectively. Between the first working oil port 1A of the flow control valve 1, between the first working oil port 1A and the second wor...

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Abstract

The invention discloses a throttle loop. The throttle loop comprises a first working port (A), a second working port (B), a directional flow control valve (1) and four switch valves (21, 22, 23, 24), wherein the first working port (A) is communicated with the pressure oil port (1P) of the directional flow control valve (1); the four switch valves (21, 22, 23, 24) are connected between the first working port (A) and the first working oil port (1A) of the directional flow control valve (1), between the first working oil port (1A) and the second working oil port (1B) of the directional flow control valve (1), between the second working oil port (1B) and the second working port (B) of the directional flow control valve (1) and between the second working port (B) and the oil return port (1T) of the directional flow control valve (1) in series respectively. The through-current capability of the throttle loop can be regulated, so that the throttle loop is applicable for a relatively wide pressure regulation range.

Description

technical field [0001] The invention relates to the field of hydraulic pressure, in particular to a throttling circuit. Background technique [0002] The throttle valve is a valve widely used in the hydraulic system, for example, it can be used in the hydraulic valve test system as the loading circuit of the test system to adjust the outlet pressure of the hydraulic valve under test. The throttle valve can use the throttling effect generated when the oil passes through the throttle port to adjust the pressure of the circuit where it is located. When a throttle valve with a certain diameter is used to adjust the circuit pressure, the pressure adjustment is too sensitive and difficult to control accurately for too small a test flow rate; for an excessively large test flow rate, even if the orifice is fully opened, the oil will pass through the orifice There is still a large throttling effect, and the pressure cannot be further reduced, that is, the pressure regulation functio...

Claims

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Application Information

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IPC IPC(8): F15B13/02
Inventor 袁野张军花邹婿邵张劲刘之安
Owner ZOOMLION HEAVY IND CO LTD
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