Unloading valve and working method thereof

Abstract

The present invention relates to an unloading valve and a working method thereof, and belongs to the technical field of coal mines. The present invention adds an annular control chamber to the unloading valve, and a force opposite to the control force of the valve core can be generated on the control chamber, thereby effectively reducing the control force. The annular area is smaller than the area on which the control force acts, and the direction of the resultant force still maintains the direction of the original control force. As the resultant force decreases, the acceleration decreases, thereby controlling the moving speed of the valve core, thereby achieving the purpose of effectively controlling the switching impact.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mines, and in particular relates to an unloading valve and a working method thereof. Background Art

[0002] The existing unloading valve usually has only one control chamber, and the opening or closing of the unloading valve is controlled by comparing the pressure in the control chamber with the pressure in the front chamber of the valve core. Due to the large control area of ​​this structure, there is a large switching impact when the unloading valve is opened and closed. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is: how to design an unloading valve which can effectively reduce the switching impact.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides an unloading valve, comprising: 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 reversing valve 9;

[0007] The one-way valve sleeve 2, the one-way valve core 3 and the one-way valve spring 4 form a one-way valve group, which is installed in the vertical cavity of the valve body 1 from top to bottom, the one-way valve sleeve 2 is installed in the vertical cavity of the valve body 1, the one-way valve core 3 is installed in the one-way valve sleeve 2, and the one-way valve spring 4 is installed inside the one-way valve core 3;

[0008] 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 installed in the horizontal cavity of the valve body 1, the unloading unit valve sleeve 5 is installed in the horizontal cavity of the valve body 1, the unloading unit valve core 6 is installed in the unloading unit valve sleeve 5, and the unloading unit spring 8 is installed in the unloading unit valve core 6;

[0009] The electromagnetic reversing valve 9 is installed on the valve body 1 and is communicated with the vertical cavity and the horizontal cavity in the valve body 1 respectively.

[0010] Preferably, an unloading valve is also included. The air supply one-way valve 7 is installed on the valve body 1 and is connected to the horizontal cavity of the valve body 1.

[0011] Preferably, the unloading valve has three connecting liquid ports: a liquid inlet, a high-pressure outlet and an unloading port.

[0012] Preferably, the pressure port of the electromagnetic reversing valve 9 is connected to the high-pressure outlet, the return liquid port is connected to the unloading port, and the 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 away from the air supply check valve 7, and the working port of the electromagnetic reversing valve 9 is connected to the rear cavity inside the unloading unit valve core 6.

[0013] Preferably, a control chamber of the unloading valve is formed between the inner wall of the horizontal chamber of the valve body 1 and the outer edge of the valve core 6 of the unloading unit. The control chamber has a circular cross section and is connected to the high-pressure outlet of the unloading valve.

[0014] Preferably, when the electromagnet of the electromagnetic reversing valve 9 loses power, there is no pressure at the working port, and when the electromagnet of the electromagnetic reversing valve 9 is energized, the working port is in a high-pressure state.

[0015] Preferably, the liquid inlet is connected to a high-pressure port of a plunger pump that provides liquid.

[0016] Preferably, the unloading port is connected to a liquid tank of the pumping station.

[0017] Preferably, the high-pressure outlet is connected to a liquid unit.

[0018] The present invention also provides a working method of the unloading valve, comprising the following steps: when the electromagnetic reversing valve 9 is energized, the second rear chamber of the unloading valve is connected to the high-pressure outlet through the electromagnetic reversing valve 9, and the high-pressure liquid acts on the circular area of ​​the rear chamber projection in the unloading unit valve core 6, generating a leftward thrust on the unloading unit valve core 6; the first rear chamber of the unloading valve is connected to the high-pressure outlet through the electromagnetic reversing valve 9, and the high-pressure liquid acts on the annular area of ​​the unloading unit valve core 6, generating a rightward thrust on the unloading unit valve core 6; since the circular area of ​​the second rear chamber projection of the unloading valve is larger than the annular area of ​​the control chamber of the unloading valve, the leftward force on the unloading unit valve core 6 is larger than the rightward force; the unloading unit valve core 6 is in the left position, cooperates with and seals with the unloading unit valve sleeve 5, and at the same time the one-way valve core 3 is opened, and the high-pressure liquid passes through the one-way valve group and flows to the liquid-using unit through the high-pressure outlet;

[0019] When the electromagnetic reversing valve 9 loses power, the second rear chamber of the unloading valve is connected to the unloading port through the electromagnetic reversing valve 9. The liquid in the second rear chamber of the unloading valve has no pressure. The force acting on the annular area of ​​the control chamber of the unloading valve pushes the unloading unit valve core 6 to move to the right, connecting the liquid inlet with the unloading port, and the liquid flows back to the pump station liquid tank through the unloading port.

[0020] (III) Beneficial effects

[0021] The present invention adds an annular control chamber to the unloading valve, and the control chamber can generate a force opposite to the valve core control force, thereby effectively reducing the control force. The annular area is smaller than the area on which the control force acts, and the direction of the resultant force still maintains the direction of the original control force. Since the resultant force decreases, the acceleration decreases, thereby controlling the movement speed of the valve core, thereby achieving the purpose of effectively controlling the switching impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the present invention when the electromagnetic reversing valve is powered;

[0023] Figure 2 This is a structural diagram of the present invention when the electromagnetic reversing valve is de-energized;

[0024] Figure 3 Schematic diagram of the circuit of the present invention, wherein a is the schematic diagram of the electromagnetic reversing valve in the energized state, and b is the schematic diagram of the electromagnetic reversing valve in the de-energized state. DETAILED DESCRIPTION

[0025] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0026] The invention provides an unloading valve used for loading and unloading control of an emulsion pump and a spray pump in mechanized coal mining.

[0027] like Figure 1 As shown, the unloading 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 supply one-way valve 7, an unloading unit spring 8, and an electromagnetic reversing valve 9;

[0028] The one-way valve sleeve 2, the one-way valve core 3 and the one-way valve spring 4 form a one-way valve group, which is installed in the vertical cavity of the valve body 1 from top to bottom. The one-way valve sleeve 2 is installed in the vertical cavity of the valve body 1, the one-way valve core 3 is installed in the one-way valve sleeve 2, and the one-way valve spring 4 is installed inside the one-way valve core 3;

[0029] 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 installed in the horizontal cavity of the valve body 1, the unloading unit valve sleeve 5 is installed in the horizontal cavity of the valve body 1, the unloading unit valve core 6 is installed in the unloading unit valve sleeve 5, and the unloading unit spring 8 is installed in the unloading unit valve core 6;

[0030] The electromagnetic reversing valve 9 is installed on the valve body 1 and communicated with the vertical cavity and the horizontal cavity in the valve body 1 respectively, and the opening and closing of the unloading valve are controlled by the internal fluid channel. The air supply check valve 7 is installed on the valve body 1 and communicated with the horizontal cavity of the valve body 1.

[0031] like Figure 2 As shown, the unloading valve has three connecting liquid ports: liquid inlet, high pressure outlet and unloading port. The liquid inlet is connected to the high pressure port of the plunger pump that provides liquid, the unloading port is connected to the pump station liquid tank, and the high pressure outlet is connected to the liquid unit.

[0032] like Figure 3 As shown, the pressure port (P port) of the electromagnetic reversing valve 9 is connected to the high-pressure outlet, the return liquid port is connected to the unloading port, and the rear chamber ② 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 away from the air replenishing one-way valve 7, and the working port of the electromagnetic reversing valve 9 is connected to the rear chamber ② in the unloading unit valve core 6.

[0033] The control chamber ① (with a circular cross 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 valve core 6 of the unloading unit and is connected to the high-pressure outlet of the unloading valve, that is, Figure 3 The A port in the unloading valve is connected, and the high-pressure liquid acts on the annular area of ​​the control chamber ① of the unloading valve, generating a rightward thrust on the unloading valve core 6.

[0034] When the electromagnet of the electromagnetic reversing valve 9 loses power, its working port is connected to the liquid receiving box with the Y port, and there is no pressure at the working port. When the electromagnet of the electromagnetic reversing valve 9 is energized, the working port is connected to the P port, and the working port is in a high pressure state.

[0035] like Figure 1 As shown, when the electromagnetic reversing valve 9 is energized, the rear chamber ② of the unloading valve is connected to the high-pressure outlet through the electromagnetic reversing valve 9, and the high-pressure liquid acts on the circular area of ​​the projection of the rear chamber ② in the unloading unit valve core 6, generating a leftward thrust on the unloading unit valve core 6, and the rear chamber ① of the unloading valve is connected to the high-pressure outlet through the electromagnetic reversing valve 9, and the high-pressure liquid acts on the annular area of ​​the unloading unit valve core 6, generating a rightward thrust on the unloading unit valve core 6. Since the circular area of ​​the projection of the rear chamber ② of the unloading valve is larger than the annular area of ​​the control chamber ① of the unloading valve, the leftward force on the unloading unit valve core 6 is larger than the rightward force, and the unloading unit valve core 6 is in the left position, cooperates with and seals the unloading unit valve sleeve 5, and at the same time, the one-way valve core 3 is opened, and the high-pressure liquid passes through the one-way valve valve group and flows to the liquid-using unit through the high-pressure outlet.

[0036] like Figure 2 As shown, when the electromagnetic reversing valve 9 loses power, the rear chamber ② of the unloading valve is connected with the unloading port through the electromagnetic reversing valve 9. The liquid in the rear chamber ② of the unloading valve has no pressure. The force acting on the annular area of ​​the control chamber ① of the unloading valve pushes the unloading unit valve core 6 to move to the right, connecting the liquid inlet with the unloading port, and the liquid flows back to the pump station liquid tank through the unloading port.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An unloading valve, characterized in that: include: Valve body (1), one-way valve sleeve (2), one-way valve core (3), one-way valve spring (4), unloading unit sleeve (5), unloading unit core (6), air supply one-way valve (7), unloading unit spring (8), solenoid reversing valve (9); The one-way valve sleeve (2), the one-way valve core (3) and the one-way valve spring (4) form a one-way valve assembly, which is installed in the vertical cavity of the valve body (1) from top to bottom, the one-way valve sleeve (2) is installed in the vertical cavity of the valve body (1), the one-way valve core (3) is installed in the one-way valve sleeve (2), and the one-way valve spring (4) is installed inside the one-way 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 mounted in a horizontal cavity of the valve body (1); the unloading unit valve sleeve (5) is mounted in the horizontal cavity of the valve body (1); the unloading unit valve core (6) is mounted in the unloading unit valve sleeve (5); and the unloading unit spring (8) is mounted in the unloading unit valve core (6); The electromagnetic reversing valve (9) is mounted on the valve body (1) and is respectively connected to the vertical cavity and the horizontal cavity in the valve body (1); The unloading valve has three connecting liquid ports: a liquid inlet, a high-pressure outlet and an unloading port; The pressure port of the electromagnetic reversing valve (9) is in communication with the high-pressure outlet, the liquid return port of the electromagnetic reversing valve (9) is in communication with the unloading port, a rear chamber 1 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) away from the air supply check valve (7), and the working port of the electromagnetic reversing valve (9) is in communication with the rear chamber 1 in the unloading unit valve core (6).

2. The unloading valve according to claim 1, characterized in that: The air supply one-way valve (7) is mounted on the valve body (1) and is connected to the horizontal cavity of the valve body (1).

3. The unloading valve according to claim 1, characterized in that: A control chamber of the unloading valve is formed between the inner wall of the horizontal chamber of the valve body (1) and the outer edge of the valve core (6) of the unloading unit. The control chamber has a circular cross section and is connected to the high-pressure outlet of the unloading valve.

4. The unloading valve according to claim 1, characterized in that: When the electromagnet of the electromagnetic reversing valve (9) loses power, there is no pressure at the working port; when the electromagnet of the electromagnetic reversing valve (9) is energized, the working port is in a high-pressure state.

5. The unloading valve according to claim 1, characterized in that: The liquid inlet is connected to a high-pressure port of a plunger pump that provides liquid.

6. The unloading valve according to claim 1, characterized in that: The unloading port is connected to the pump station liquid tank.

7. The unloading valve according to claim 1, characterized in that: The high-pressure outlet is connected to a liquid unit.

8. A method for operating an unloading valve according to any one of claims 3 to 7, characterized in that: The following steps are involved: When the electromagnetic reversing valve (9) is energized, the rear chamber 1 of the unloading valve is connected to the high-pressure outlet through the electromagnetic reversing valve (9), and the high-pressure liquid acts on the circular area of ​​the projection of the rear chamber 1 in the unloading unit valve core (6), generating a leftward thrust on the unloading unit valve core (6). The rear chamber 2 of the unloading valve is connected to the high-pressure outlet through the electromagnetic reversing valve (9), and the high-pressure liquid acts on the annular area of ​​the unloading unit valve core (6), generating a rightward thrust on the unloading unit valve core (6). Since the circular area of ​​the projection of the rear chamber 1 of the unloading valve is larger than the annular area of ​​the control chamber of the unloading valve, the leftward force on the unloading unit valve core (6) is larger than the rightward force, and the unloading unit valve core (6) is in the left position, cooperating with and sealing the unloading unit valve sleeve (5). At the same time, the one-way valve core (3) is opened, and the high-pressure liquid passes through the one-way valve group and flows to the liquid-using unit through the high-pressure outlet; When the electromagnetic reversing valve (9) loses power, the rear chamber 1 of the unloading valve is connected to the unloading port through the electromagnetic reversing valve (9). The liquid in the rear chamber 1 of the unloading valve has no pressure. The force acting on the annular area of ​​the control chamber of the unloading valve pushes the unloading unit valve core (6) to move rightward, connecting the liquid inlet with the unloading port, and the liquid flows back to the pump station liquid tank through the unloading port.

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