阅读说明：本技术 一种卸载阀及其工作方法 (Unloading valve and working method thereof ) 是由 杜建华 王燕丽 杨淑芳 于 2020-06-24 设计创作，主要内容包括：本发明涉及一种卸载阀及其工作方法,属于煤矿技术领域。本发明通过在卸载阀上增加环形的控制腔,该控制腔上可以产生一个和阀芯控制力相反的力,有效的减少了控制力,而环形面积小于控制力作用的面积,合力的方向依然保持原有控制力的方向,由于合力变小加速度变小,从而可以控制阀芯的移动速度,进而达到有效控制换向冲击的目的。(The invention relates to an unloading valve and a working method thereof, and belongs to the technical field of coal mines. According to the invention, the annular control cavity is added on the unloading valve, the control cavity can generate a force opposite to the control force of the valve core, the control force is effectively reduced, the annular area is smaller than the area of the control force, the direction of resultant force still keeps the direction of the original control force, and the acceleration is reduced because the resultant force is reduced, so that the moving speed of the valve core can be controlled, and the aim of effectively controlling the reversing impact is further achieved.)

1. An unloader valve, comprising: the valve comprises a valve body (1), a one-way valve sleeve (2), a one-way valve core (3), a one-way valve spring (4), an unloading unit valve sleeve (5), an unloading unit valve core (6), an unloading unit spring (8) and an electromagnetic directional valve (9);

the check valve comprises a check valve sleeve (2), a check valve spool (3) and a check valve spring (4), wherein the check valve sleeve (2), the check valve spool (3) and the check valve spring (4) form a check valve group which is arranged in a vertical cavity of a valve body (1) from top to bottom, the check valve sleeve (2) is arranged in the vertical cavity of the valve body (1), the check valve spool (3) is arranged in the check valve sleeve (2), and the check valve spring (4) is arranged in the check valve spool (3);

the unloading valve unit is composed of an unloading unit valve sleeve (5), an unloading unit valve core (6) and an unloading unit spring (8), the unloading valve unit is horizontally arranged in a horizontal cavity of the valve body (1), the unloading unit valve sleeve (5) is arranged in the horizontal cavity of the valve body (1), the unloading unit valve core (6) is arranged in the unloading unit valve sleeve (5), and the unloading unit spring (8) is arranged in the unloading unit valve core (6);

the electromagnetic directional valve (9) is arranged on the valve body (1) and is respectively communicated with the vertical cavity and the horizontal cavity in the valve body (1).

2. Unloading valve according to claim 1, further comprising an unloading valve, wherein the gas make-up check valve (7) is mounted on the valve body (1) and communicates with the horizontal cavity of the valve body (1).

3. Unloading valve according to claim 1, characterized in that it has a total of (3) connecting ports: a liquid inlet, a high-pressure outlet and an unloading port.

4. The unloading valve according to claim 3, wherein the pressure port of the electromagnetic directional valve (9) is communicated with the high-pressure outlet, the liquid return port is communicated with the unloading port, a rear cavity of the unloading valve is formed between the inner wall of the horizontal cavity of the valve body (1) and the end face of the unloading unit valve core (6) far away from the gas supplementing one-way valve (7), and the working port of the electromagnetic directional valve (9) is communicated with the rear cavity in the unloading unit valve core (6).

5. Unloading valve according to claim 3, characterised in that between the inner wall of the horizontal cavity of the valve body (1) and the outer edge of the unloading unit spool (6) there is formed a control chamber of the unloading valve, which has a circular cross-section and communicates with the high-pressure outlet of the unloading valve.

6. An unloader valve according to claim 1, wherein the solenoid of the solenoid operated directional valve (9) is de-energised to leave the working port at a non-pressurised condition, and the solenoid of the solenoid operated directional valve (9) is energised to leave the working port at a pressurised condition.

7. An unloader valve according to claim 3, wherein the inlet port is connected to a high pressure port of a plunger pump which provides the liquid.

8. An unloader valve according to claim 3, wherein the unloader port is connected to a pump station tank.

9. An unloader valve according to claim 3, wherein the high pressure outlet is connected to a liquid cell.

10. A method of operating an unloader valve as defined in any one of claims 5 to 9, comprising the steps of: when the electromagnetic directional valve (9) is electrified, the second rear cavity of the unloading valve is communicated with the high-pressure outlet through the electromagnetic directional valve (9), high-pressure liquid acts on the circular area projected by the rear cavity in the unloading unit valve core (6) to generate leftward thrust on the unloading unit valve core (6), the first rear cavity of the unloading valve is communicated with the high-pressure outlet through the electromagnetic directional valve (9), the high-pressure liquid acts on the annular area of the unloading unit valve core (6) to generate rightward thrust on the unloading unit valve core (6), because the circular area projected by the second rear cavity of the unloading valve is larger than the annular area of the control cavity of the unloading valve, the leftward force borne by the unloading unit valve core (6) is larger than the rightward force, the unloading unit valve core (6) is positioned at the left side and is matched and sealed with the unloading unit valve sleeve (5), the one-way valve core (3) is opened at the same time, and the high-pressure liquid passes through the one-way valve group, flows to the liquid using unit through the high-pressure outlet;

when the electromagnetic directional valve (9) is powered off, the second rear cavity of the unloading valve is communicated with the unloading port through the electromagnetic directional valve (9), liquid in the second rear cavity of the unloading valve has no pressure, the force acting on the annular area of the control cavity of the unloading valve pushes the unloading unit valve core (6) to move rightwards, the liquid inlet is communicated with the unloading port, and the liquid flows back to a liquid tank of a pump station through the unloading port.

Technical Field

The invention belongs to the technical field of coal mines, and particularly relates to an unloading valve and a working method thereof.

Background

The existing unloading valve generally only has one control cavity, and the opening or closing of the unloading valve is controlled by comparing the pressure of the control cavity with the pressure of a front cavity of a valve core. Due to the fact that the control area of the structure is large, great reversing impact exists when the unloading valve is opened and closed.

Disclosure of Invention

Technical problem to be solved

The technical problem to be solved by the invention is as follows: how to design an unloading valve capable of effectively reducing reversing impact.

(II) technical scheme

In order to solve the above technical problem, the present invention provides an unloading valve, including: the valve comprises a valve body 1, a one-way valve sleeve 2, a one-way valve spool 3, a one-way valve spring 4, an unloading unit valve sleeve 5, an unloading unit valve spool 6, an unloading unit spring 8 and an electromagnetic directional valve 9;

the check valve comprises a check valve sleeve 2, a check valve core 3 and a check valve spring 4, wherein the check valve sleeve 2, the check valve core 3 and the check valve spring 4 form a check valve group which is arranged in a vertical cavity of a valve body 1 from top to bottom, the check valve sleeve 2 is arranged in the vertical cavity of the valve body 1, the check valve core 3 is arranged in the check valve sleeve 2, and the check valve spring 4 is arranged in the check valve core 3;

the unloading unit valve sleeve 5, the unloading unit valve core 6 and the unloading unit spring 8 form an unloading valve unit which is horizontally arranged in a horizontal cavity of the valve body 1, the unloading unit valve sleeve 5 is arranged in the horizontal cavity of the valve body 1, the unloading unit valve core 6 is arranged in the unloading unit valve sleeve 5, and the unloading unit spring 8 is arranged in the unloading unit valve core 6;

the electromagnetic directional valve 9 is arranged on the valve body 1 and is respectively communicated with the vertical cavity and the horizontal cavity in the valve body 1.

Preferably, the air supply check valve further comprises an unloading valve, and the air supply check valve 7 is installed on the valve body 1 and is communicated with the horizontal cavity of the valve body 1.

Preferably, the unloading valve has 3 connecting liquid ports: a liquid inlet, a high-pressure outlet and an unloading port.

Preferably, a pressure port of the electromagnetic directional valve 9 is communicated with the high-pressure outlet, a liquid return port is communicated with the unloading port, a rear cavity of the unloading valve is formed between the inner wall of the horizontal cavity of the valve body 1 and the end face of the unloading unit valve core 6, which is far away from the gas supplementing one-way valve 7, and a working port of the electromagnetic directional valve 9 is communicated with the rear cavity in the unloading unit valve core 6.

Preferably, a control cavity of the unloading valve is formed between the inner wall of the horizontal cavity of the valve body 1 and the outer edge of the unloading unit valve core 6, has a circular ring-shaped cross section, and is communicated with a high-pressure outlet of the unloading valve.

Preferably, when the electromagnet of the electromagnetic directional valve 9 is powered off, the working port has no pressure, and when the electromagnet of the electromagnetic directional valve 9 is powered on, the working port is in a high-pressure state.

Preferably, the liquid inlet is connected to a high pressure port of a plunger pump that provides liquid.

Preferably, the unloading port is connected to a pump station liquid tank.

Preferably, the high-pressure outlet is connected with a liquid unit.

The invention also provides a working method of the unloading valve, which comprises the following steps: when the electromagnetic directional valve 9 is electrified, the second rear cavity of the unloading valve is communicated with the high-pressure outlet through the electromagnetic directional valve 9, high-pressure liquid acts on the projected circular area of the rear cavity in the unloading unit valve core 6 to generate leftward thrust on the unloading unit valve core 6, the first rear cavity of the unloading valve is communicated with the high-pressure outlet through the electromagnetic directional valve 9, the high-pressure liquid acts on the annular area of the unloading unit valve core 6 to generate rightward thrust on the unloading unit valve core 6, the leftward force borne by the unloading unit valve core 6 is greater than the rightward force due to the fact that the projected circular area of the second rear cavity of the unloading valve is greater than the annular area of the control cavity of the unloading valve, the unloading unit valve core 6 is located at the left side position, is matched and sealed with the unloading unit valve sleeve 5, meanwhile, the one-way valve core 3 is opened, and the high-pressure liquid flows to the liquid using unit through the one-way;

when the electromagnetic directional valve 9 loses power, the second rear cavity of the unloading valve is communicated with the unloading port through the electromagnetic directional valve 9, liquid in the second rear cavity of the unloading valve has no pressure, the force acting on the annular area of the control cavity of the unloading valve pushes the valve core 6 of the unloading unit to move rightwards, the liquid inlet is communicated with the unloading port, and the liquid flows back to a liquid tank of a pump station through the unloading port.

(III) advantageous effects

According to the invention, the annular control cavity is added on the unloading valve, the control cavity can generate a force opposite to the control force of the valve core, the control force is effectively reduced, the annular area is smaller than the area of the control force, the direction of resultant force still keeps the direction of the original control force, and the acceleration is reduced because the resultant force is reduced, so that the moving speed of the valve core can be controlled, and the aim of effectively controlling the reversing impact is further achieved.

Drawings

FIG. 1 is a structural diagram of the electromagnetic directional valve in an energized state according to the present invention;

FIG. 2 is a structural diagram of the electromagnetic directional valve in a power-off state according to the present invention;

fig. 3 is a schematic circuit diagram of the present invention, wherein a is a schematic diagram of the electromagnetic directional valve in the power-on state, and b is a schematic diagram of the electromagnetic directional valve in the power-off state.

Detailed Description

In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

The invention provides an unloading valve which is used for loading and unloading control of an emulsion pump and a spray pump in mechanized coal mining.

As shown in fig. 1, the unloading valve includes: the valve comprises a valve body 1, a one-way valve sleeve 2, a one-way valve core 3, a one-way valve spring 4, an unloading unit valve sleeve 5, an unloading unit valve core 6, an air supplementing one-way valve 7, an unloading unit spring 8 and an electromagnetic directional valve 9;

the check valve comprises a check valve sleeve 2, a check valve core 3 and a check valve spring 4, wherein the check valve sleeve 2, the check valve core 3 and the check valve spring 4 form a check valve group which is arranged in a vertical cavity of a valve body 1 from top to bottom, the check valve sleeve 2 is arranged in the vertical cavity of the valve body 1, the check valve core 3 is arranged in the check valve sleeve 2, and the check valve spring 4 is arranged in the check valve core 3;

the unloading unit valve sleeve 5, the unloading unit valve core 6 and the unloading unit spring 8 form an unloading valve unit which is horizontally arranged in a horizontal cavity of the valve body 1, the unloading unit valve sleeve 5 is arranged in the horizontal cavity of the valve body 1, the unloading unit valve core 6 is arranged in the unloading unit valve sleeve 5, and the unloading unit spring 8 is arranged in the unloading unit valve core 6;

the electromagnetic directional valve 9 is installed on the valve body 1, is respectively communicated with a vertical cavity and a horizontal cavity in the valve body 1, and is controlled by an internal fluid channel to open and close the unloading valve. The air supply one-way valve 7 is arranged on the valve body 1 and communicated with the horizontal cavity of the valve body 1.

As shown in fig. 2, the unloading valve has 3 connecting liquid ports: a liquid inlet, a high-pressure outlet and an unloading port. The liquid inlet is connected with a high-pressure port of a plunger pump for providing liquid, the unloading port is connected to a pump station liquid tank, and the high-pressure outlet is connected with a liquid unit.

As shown in fig. 3, a pressure port (P port) of the electromagnetic directional valve 9 is communicated with the high-pressure outlet, a liquid return port is communicated with the unloading port, a rear cavity of the unloading valve is formed between the inner wall of the horizontal cavity of the valve body 1 and the end surface of the unloading unit valve core 6 far away from the gas supplementing one-way valve 7, and a working port of the electromagnetic directional valve 9 is communicated with the rear cavity in the unloading unit valve core 6.

A control cavity (with a circular section) of the unloading valve is formed between the inner wall of the horizontal cavity of the valve body 1 and the outer edge of the unloading unit valve core 6 and is communicated with a high-pressure outlet of the unloading valve, namely is connected with the port A in the figure 3, and high-pressure liquid acts on the circular area of the control cavity (i) of the unloading valve and generates a rightward thrust on the unloading valve core 6.

When the electromagnet of the electromagnetic directional valve 9 loses power, the working port and the Y port are communicated with the liquid receiving box, and the working port has no pressure. When the electromagnet of the electromagnetic directional valve 9 is electrified, the working port is communicated with the port P, and the working port is in a high-pressure state.

As shown in figure 1, when the electromagnetic directional valve 9 is electrified, the rear cavity of the unloading valve is communicated with the high-pressure outlet through the electromagnetic directional valve 9, the high-pressure liquid acts on the circular area of the projection of the rear cavity in the valve core 6 of the unloading unit, generates leftward thrust on the valve core 6 of the unloading unit, a rear cavity (I) of the unloading valve is communicated with a high-pressure outlet through an electromagnetic directional valve 9, high-pressure liquid acts on the annular area of the valve core 6 of the unloading unit, the valve core 6 of the unloading unit generates a thrust force to the right, because the circular area of the projection of the rear cavity of the unloading valve is larger than the annular area of the control cavity of the unloading valve, the leftward force applied to the valve core 6 of the unloading unit is larger than the rightward force, the valve core 6 of the unloading unit is positioned at the left side position and is matched and sealed with the valve sleeve 5 of the unloading unit, meanwhile, the valve core 3 of the one-way valve is opened, and high-pressure liquid flows to the liquid using unit through the high-pressure outlet by passing through the valve group of the one-way valve.

As shown in figure 2, when the electromagnetic directional valve 9 is powered off, the rear cavity II of the unloading valve is communicated with the unloading port through the electromagnetic directional valve 9, the liquid of the rear cavity II of the unloading valve has no pressure, the force acting on the annular area of the control cavity I of the unloading valve pushes the valve core 6 of the unloading unit to move rightwards, the liquid inlet is communicated with the unloading port, and the liquid flows back to a liquid tank of a pump station through the unloading port.

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.