阅读说明：本技术 一种液压控制模块及液压系统 (Hydraulic control module and hydraulic system ) 是由 赵锦 谢朝阳 张安民 赵梅 郭方圣 乔战战 孙志远 袁积亨 于 2021-06-30 设计创作，主要内容包括：本发明涉及一种液压控制模块及液压系统,该液压控制系统包括：由定量泵和控制阀构成的控制模块,阀和执行机构。定量泵液压油通过阀流向执行机构,阀为闭中心负载敏感阀,设置负载敏感信号油口；控制模块的进油口与油箱相连,定量泵的出油口与控制阀的进油口和LS1油口相通；控制阀的出油口与油箱或者定量泵的进油口相通。控制阀通过调节开口大小,维持阀进口压力与出口负载压力的压差,使旁通回油从控制阀的进油口至出油口再到定量泵进油口,在外部实现旁通溢流,减少从定量泵出口到油箱的沿程损失,实现节能。(The invention relates to a hydraulic control module and a hydraulic system, wherein the hydraulic control system comprises: the control module comprises a control valve, a valve and an actuating mechanism, wherein the control module comprises a fixed displacement pump and a control valve. The hydraulic oil of the fixed displacement pump flows to the actuating mechanism through the valve, the valve is a closed center load sensitive valve, and a load sensitive signal oil port is arranged; an oil inlet of the control module is connected with an oil tank, and an oil outlet of the constant delivery pump is communicated with an oil inlet of the control valve and an LS1 oil port; the oil outlet of the control valve is communicated with an oil tank or an oil inlet of the fixed displacement pump. The control valve maintains the pressure difference between the inlet pressure and the outlet load pressure of the valve by adjusting the size of the opening, so that bypass return oil flows from the oil inlet to the oil outlet of the control valve to the oil inlet of the constant delivery pump, bypass overflow is realized on the outside, the loss along the way from the outlet of the constant delivery pump to the oil tank is reduced, and energy conservation is realized.)

1. A hydraulic control module, comprising: the control system comprises a fixed displacement pump (1-1) and a control valve (1-2), wherein the control module is provided with an oil inlet, an oil outlet and a hydraulic control port;

an oil inlet of the constant delivery pump (1-1) is connected with an oil inlet of the control module, and an oil outlet of the constant delivery pump (1-1) is connected with an oil outlet of the control module;

the control valve (1-2) is provided with an oil inlet P1, an oil return port T1, a first hydraulic control port LS1 and a second hydraulic control port LS 2;

an oil inlet P1 and a first hydraulic control port LS1 of the control valve (1-2) are connected to an oil outlet of the control module; the second hydraulic control port LS2 of the control valve (1-2) is connected to the hydraulic control port of the control module;

a spring is arranged at the second hydraulic control port LS2 of the control valve (1-2) and is used for calibrating the pressure difference between the first hydraulic control port LS1 and the second hydraulic control port LS 2;

and an oil return port T1 of the control valve (1-2) is connected to an oil inlet of the fixed displacement pump (1-1).

2. A hydraulic control module, comprising: the control system comprises a constant delivery pump (1-1) and a control valve (1-2), wherein the control module is provided with an oil inlet, an oil outlet, a hydraulic control port and an oil return port;

an oil inlet of the constant delivery pump (1-1) is connected with an oil inlet of the control module, and an oil outlet of the constant delivery pump (1-1) is connected with an oil outlet of the control module;

the control valve (1-2) is provided with an oil inlet P1, an oil return port T1, a first hydraulic control port LS1 and a second hydraulic control port LS 2;

an oil inlet P1 and a first hydraulic control port LS1 of the control valve (1-2) are connected to an oil outlet of the control module; the second hydraulic control port LS2 of the control valve (1-2) is connected to the hydraulic control port of the control module;

a spring is arranged at the second hydraulic control port LS2 of the control valve (1-2) and is used for calibrating the pressure difference between the first hydraulic control port LS1 and the second hydraulic control port LS 2;

the return port T1 of the control valve (1-2) is connected to the return port of the control module.

3. A hydraulic control module according to claim 1 or 2, characterized in that the spring force of the control valve (1-2) is adjustable.

4. A hydraulic control module according to claim 1 or 2, characterized in that the spring force of the control valve (1-2) is not adjustable.

5. A hydraulic system, characterized by comprising a hydraulic control module (1) according to any one of claims 1 to 4, further comprising a valve (2) and an actuator (3);

the valve (2) is provided with an oil inlet, an oil outlet and a load sensitive signal oil port LS 3;

an oil inlet of the hydraulic control module (1) is connected with a hydraulic oil tank, and an oil outlet of the hydraulic control module (1) is connected with an oil inlet of the valve (2);

an oil outlet of the valve (2) is connected with an oil inlet of the actuating mechanism (3);

the load sensitive signal oil port LS3 is respectively connected with an oil outlet of the valve (2) and a hydraulic control port of the hydraulic control module (1);

the oil return port of the actuating mechanism (3) is connected to an oil tank through a valve (2).

6. A hydraulic system as claimed in claim 5, characterized in that the valve (2) is a closed centre load sensitive valve.

7. A hydraulic system according to claim 5, characterized in that the spool of the control valve (1-2) in the hydraulic control module (1) can be arranged to be normally closed.

8. A hydraulic system according to claim 5, characterized in that the hydraulic control module (1) maintains the pressure difference between the inlet pressure and the outlet load pressure of the valve (2) by adjusting the size of the opening of the control valve (1-2) from the inlet to the return.

9. A hydraulic system according to claim 5, characterized in that the valve (2) has a first state and a second state,

when a reversing valve of the valve (2) is in a neutral position, the valve (2) is in a first state, a load sensitive signal oil port LS3 of the valve (2) has no load pressure, when the pressure of a first hydraulic control port LS1 of the control valve (1-2) overcomes the pressure of a spring at a second hydraulic control port LS2, a valve core of the control valve (1-2) moves, an oil inlet and an oil outlet of the control valve (1-2) are communicated, and hydraulic fluid of the fixed displacement pump (1-1) flows back to the fixed displacement pump (1-1) through the control valve (1-2);

when the reversing valve of the valve (2) is in a non-neutral position, the valve (2) is in a second state, a load sensitive signal oil port LS3 of the valve (2) has load pressure, a load sensitive signal oil port LS3 feeds back a load pressure signal to a hydraulic control port of the control module and then feeds back the load pressure signal to a second hydraulic control port LS2 of the control valve (1-2), a valve core of the control valve (1-2) is kept stable under the action of the pressure signal of the first hydraulic control port LS1, the pressure signal of the second hydraulic control port LS2 and a spring force, and the flow supplied to the actuating mechanism (3) is controlled through the size of a reversing valve opening of the control valve (2).

Technical Field

The invention relates to the technical field of engineering machinery hydraulic systems, in particular to a hydraulic control module and a hydraulic system.

Background

The common engineering machinery hydraulic systems at present comprise a quantitative system, a quantitative and variable combined system, a fully variable system and the like. The all-variable system adopts the variable plunger pump to output corresponding flow according to the requirements of the actuating mechanism, realizes energy conservation, reduces the power loss of the hydraulic system, and has obvious energy-saving effect. At present, a quantitative system still occupies a dominant position, is low in cost, easy to maintain and strong in pollution resistance, but the conventional quantitative hydraulic system has the following problems: (1) the full-flow bypass throttling speed regulation is adopted, so that the pressure and flow losses are large, and the energy loss is large; (2) the load sensitive control cannot be realized, the flow output characteristic is greatly influenced by the load pressure, and the controllability is poor; (3) by adopting the open center valve, the hydraulic system has large loss along the way and the system generates heat seriously.

Disclosure of Invention

In order to solve the technical problems, the invention provides a hydraulic control module and a hydraulic system, which realize bypass overflow outside, reduce the loss along the way from the outlet of a constant delivery pump to an oil tank and realize energy conservation.

The technical scheme adopted by the invention is as follows:

one aspect of the present invention provides a hydraulic control module, including: a fixed displacement pump 1-1 and a control valve 1-2; the hydraulic control module is provided with an oil inlet, an oil outlet and a hydraulic control port;

an oil inlet of the constant delivery pump 1-1 is connected with an oil inlet of the hydraulic control module, and an oil outlet of the constant delivery pump 1-1 is connected with an oil outlet of the hydraulic control module;

the control valve 1-2 is provided with an oil inlet P1, an oil return port T1, a first hydraulic control port LS1 and a second hydraulic control port LS 2;

an oil inlet P1 and a first hydraulic control port LS1 of the control valve 1-2 are connected to an oil outlet of the hydraulic control module; the second hydraulic control port LS2 of the hydraulic control valve 1-2 is connected to the hydraulic control port of the hydraulic control module;

a spring is arranged at the second hydraulic control port LS2 of the control valve 1-2 and is used for calibrating the pressure difference between the first hydraulic control port LS1 and the second hydraulic control port LS 2;

and an oil return port T1 of the control valve 1-2 is connected to an oil inlet of the fixed displacement pump 1-1.

In another aspect, the present invention provides a hydraulic control module, including: the hydraulic control system comprises a fixed displacement pump 1-1 and a control valve 1-2, wherein the hydraulic control module is provided with an oil inlet, an oil outlet, a hydraulic control port and an oil return port;

an oil inlet of the constant delivery pump 1-1 is connected with an oil inlet of the hydraulic control module, and an oil outlet of the constant delivery pump 1-1 is connected with an oil outlet of the hydraulic control module;

the control valve 1-2 is provided with an oil inlet P1, an oil return port T1, a first hydraulic control port LS1 and a second hydraulic control port LS 2;

an oil inlet P1 and a first hydraulic control port LS1 of the control valve 1-2 are connected to an oil outlet of the hydraulic control module; the second hydraulic control port LS2 of the control valve 1-2 is connected to the hydraulic control port of the hydraulic control module;

a spring is arranged at the second hydraulic control port LS2 of the control valve 1-2 and is used for calibrating the pressure difference between the first hydraulic control port LS1 and the second hydraulic control port LS 2;

the oil return port T1 of the control valve 1-2 is connected to the oil return port of the hydraulic control module.

Further, the spring force of the control valve 1-2 is adjustable.

Further, the spring force of the control valve 1-2 is not adjustable.

The third aspect of the invention provides a hydraulic system, which comprises the hydraulic control module 1, a valve 2 and an actuator 3;

the valve 2 is provided with an oil inlet, an oil outlet and a load sensitive signal oil port LS 3;

an oil inlet of the hydraulic control module 1 is connected with a hydraulic oil tank, and an oil outlet of the hydraulic control module 1 is connected with an oil inlet of the valve 2;

an oil outlet of the valve 2 is connected with an oil inlet of the actuating mechanism 3;

the load sensitive signal oil port LS3 is respectively connected with the oil outlet of the valve 2 and the hydraulic control port of the hydraulic control module 1;

the return port of the actuator 3 is connected to the tank via a valve 2.

Further, the valve 2 is a closed center load sensitive valve.

Further, the valve core of the control valve 1-2 in the hydraulic control module 1 can be set to be normally closed.

Furthermore, the hydraulic control module 1 maintains the pressure difference between the inlet pressure and the outlet load pressure of the valve 2 by adjusting the opening size from the oil inlet to the oil return port of the control valve 1-2.

Further, the valve 2 has a first state and a second state,

when the reversing valve of the valve 2 is in a neutral position, the valve 2 is in a first state, the load sensitive signal oil port LS3 of the valve 2 has no load pressure, when the pressure of the first hydraulic control port LS1 of the control valve 1-2 overcomes the pressure of a spring at the second hydraulic control port LS2, the valve core of the control valve 1-2 moves, the oil inlet and the oil outlet of the control valve 1-2 are communicated, and hydraulic fluid of the fixed displacement pump 1-1 flows back to the fixed displacement pump 1-1 through the control valve 1-2;

when the reversing valve of the valve 2 is in a non-neutral position, the valve 2 is in a second state, a load sensitive signal oil port LS3 of the valve 2 has load pressure, a load sensitive signal oil port LS3 feeds back a load pressure signal to a hydraulic control port of the control module and then feeds back the load pressure signal to a second hydraulic control port LS2 of the control valve 1-2, a valve core of the control valve 1-2 maintains stability under the action of a first hydraulic control port LS1 pressure signal, a second hydraulic control port LS2 pressure signal and a spring force, and the flow supplied to the actuating mechanism 3 is controlled through the size of a reversing valve opening of the control valve 2.

The invention achieves the following beneficial effects:

the oil inlet of the control valve in the control module is communicated with the oil outlet of the constant delivery pump, and the oil return port of the control valve is communicated with the oil inlet of the constant delivery pump or directly connected with the oil tank, so that bypass return oil can return from the control valve, bypass overflow is realized on the outside, the flow entering the valve is reduced, the loss along the way from the outlet of the constant delivery pump to the oil tank is reduced, and energy conservation is realized.

The hydraulic system of the invention conveys the hydraulic fluid output by the control module to the actuating mechanism through the valve, the valve is provided with the load sensitive signal oil port to sense whether the load pressure exists or not, and the opening size of the control valve is adjusted, thus realizing the load sensitive control of the quantitative system.

The load-sensitive control module has high integration degree, simple system and low cost.

Drawings

FIG. 1 is a hydraulic schematic of one embodiment of a constant displacement pump based load sensitive control module of the present invention;

FIG. 2 is a hydraulic schematic of another embodiment of a constant displacement pump based load sensitive control module according to the present invention;

FIG. 3 is a hydraulic schematic of one embodiment of the hydraulic system of the present invention;

description of reference numerals:

1-a hydraulic control module; 1-1-quantitative pump; 1-2-control valve; 2-a valve; and 3, executing the mechanism.

Detailed Description

The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The invention provides a hydraulic control module, as shown in a hydraulic schematic diagram shown in fig. 1, 2 and 3, the hydraulic control module 1 comprises: a fixed displacement pump 1-1 and a control valve 1-2. The control module 1 is provided with an oil inlet, an oil outlet, a hydraulic control port and an oil return port.

Specifically, the fixed displacement pump 1-1 is a hydraulic actuator for supplying hydraulic fluid, and the fixed displacement pump 1-1 returns oil through a control valve 1-2;

an oil inlet of the constant delivery pump 1-1 is connected with an oil inlet of the hydraulic control module, and an oil outlet of the constant delivery pump 1-1 is connected with an oil outlet of the hydraulic control module;

the control valve 1-2 is provided with an oil inlet, an oil return port, a first hydraulic control port LS1 and a second hydraulic control port LS2,

an oil inlet P1 and a first hydraulic control port LS1 of the control valve 1-2 are connected to an oil outlet of the hydraulic control module, and the first hydraulic control port LS1 is used for transmitting the pressure of the oil outlet of the hydraulic control module to a valve core of the control valve 1-2;

the second hydraulic control port LS2 of the control valve 1-2 is connected to a hydraulic control port of a hydraulic control module, and the second hydraulic control port LS2 is used for transmitting the pressure of the hydraulic control port of the hydraulic control module to a valve core of the control valve 1-2;

a spring is arranged at a second liquid control port LS2 of the control valve 1-2 and used for calibrating the pressure difference at two ends of a valve core of the control valve 1-2; the spring force of the control valve 1-2 can be adjusted or not;

the first hydraulic control port LS1 and the second hydraulic control port LS2 of the control valve 1-2 act on a valve core of the control valve 1-2 together with spring force to control the valve core of the control valve 1-2 to move;

the oil return port of the control valve 1-2 is communicated with the oil inlet of the fixed displacement pump 1-1 and can also be connected back to the hydraulic control module.

Referring to fig. 1, in an embodiment of the present invention, an oil outlet T1 of a control valve 1-2 is connected to an oil inlet of a fixed displacement pump 1-1, and is configured to return hydraulic fluid flowing through the control valve 1-2 from the fixed displacement pump 1-1 to the fixed displacement pump 1-1.

Referring to fig. 2, in one embodiment of the present invention, the oil outlet T1 of the control valve 1-2 is connected to an oil return port of the hydraulic control module for returning the hydraulic fluid flowing through the control valve 1-2 of the fixed displacement pump 1-1 to the hydraulic control module.

The invention also provides a hydraulic system, see fig. 3, comprising a control module 1, a valve 2 and an actuator 3. The valve 2 is used to deliver hydraulic fluid output by the hydraulic control module 1 to the actuator 3.

An oil inlet of the hydraulic control module 1 is connected with an oil tank, an oil outlet P port of the hydraulic control module 1 is connected with an oil inlet P2 port of the valve 2, an oil outlet A1 port of the valve 2 is connected with an inlet of the executing mechanism 3, and an LS3 port of the valve 2 is connected with an oil outlet of the valve 2 and a hydraulic control port of the hydraulic control module 1 respectively. The return of the actuator 3 is connected to the tank via a valve 2.

Hydraulic oil of the fixed displacement pump 1-1 flows to the actuating mechanism 3 through the valve 2; the valve 2 is a closed center load sensitive valve and is provided with a load sensitive signal oil port LS 3; an LS1 port of the control valve 1-2 is communicated with an oil outlet of the fixed displacement pump 1-1, an LS2 port of the control valve 1-2 is connected with a load sensitive signal oil port LS3 of the valve 2, a P1 port of the control valve 1-2 is communicated with an oil outlet of the fixed displacement pump 1-1, and a T1 port of the control valve 1-2 is communicated with an oil inlet of the fixed displacement pump 1-1. The control valve 1-2 maintains the pressure difference between the inlet pressure and the outlet load pressure of the valve 2 by adjusting the opening size, so that the flow passing through the valve 2 to the actuating mechanism 3 is only related to the opening area of the reversing valve of the valve 2 and is not related to the load. LS1 of the control valve 1-2, LS2 and spring force act together on a valve core of the control valve 1-2, and the valve core of the control valve 1-2 moves; the control valve 1-2 directly passes the surplus flow of the fixed displacement pump 1-1 from the P1 port to the T1 port of the control valve 1-2 and then flows to the oil inlet of the fixed displacement pump 1-1, so that the flow entering the valve 2 from the fixed displacement pump 1-1 is adjusted by the requirement of an actuating mechanism, and the power loss of the system is reduced.

The working principle of the hydraulic system of the invention is as follows:

the valve core of the control valve 1-2 can be set to be a normally closed type, when the reversing valve of the valve 2 is in a neutral position, the actuating mechanism 3 does not act, when the LS3 port of the valve 2 has no load pressure, the LS2 of the control valve 1-2 has no pressure, the LS1 port of the control valve 1-2 is applied to one end of the valve core from the oil outlet of the fixed displacement pump 1-1, when the pressure of the LS1 port overcomes the pressure of a spring, the valve core of the control valve 1-2 is moved, the P1 port of the control valve 1-2 is communicated with the T port, and oil at the oil outlet of the fixed displacement pump 1-1 flows to the T1 through the control valve 1-2 and then flows to the oil inlet of the fixed displacement pump 1-1 or an oil tank.

When the reversing valve of the valve 2 moves and the LS3 port of the valve 2 has load pressure, the valve core of the control valve 1-2 is kept stable under the action of LS1, LS2 and spring force, so that the flow rate flowing to the actuating mechanism 3 is independent of the load and only related to the opening size of the reversing valve of the valve 2, when the flow rate of the fixed-quantity pump 1-1 is larger than the flow rate required by the actuating mechanism 3, the outlet pressure of the fixed-quantity pump 1-1 is increased, the pressure of the LS1 port of the control valve 1-2 is increased, the control valve 1-2 moves downwards, the opening from the P1 port to the T1 of the control valve 1-2 is increased, and the redundant flow rate of the fixed-quantity pump 1-1 flows to the oil tank through the control valve 1-2; when the flow rate of the fixed displacement pump 1-1 is smaller than the flow rate required by the actuator 3, the outlet pressure of the fixed displacement pump 1-1 is reduced, and the control valve 1-2 moves upwards, so that the openings of the control valves P1 to T1 tend to be closed, and the flow rate of the fixed displacement pump 1-1 meets the flow rate required by the actuator 3.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.