Gradient type unloading valve of emulsion pump

Abstract

The utility model relates to the technical field of unloading valves, in particular to a gradient type unloading valve of an emulsion pump, which comprises an unloading valve body, the unloading valve body comprises two main valve bodies, each main valve body is provided with a high-pressure liquid outlet, an unloading liquid return port and a pump liquid supply port, the pump liquid supply port is communicated with the high-pressure liquid outlets, the two high-pressure liquid outlets are communicated, and the unloading liquid return port is communicated with the pump liquid supply port. The two unloading liquid return ports are communicated, each main valve body is provided with a pilot valve body, one side of each unloading valve body is provided with two electromagnetic valves, the two electromagnetic valves are connected with the two pilot valve bodies one by one, the set pressures of the two pilot valve bodies are different, when the system pressure of hydraulic oil rises to a first-stage set value, one electromagnetic valve is powered on, and the other electromagnetic valve is powered off; and if the pressure continues to rise to a first-stage set value, one set of main valve bodies are controlled to be opened, small-flow unloading is achieved, pressure rising is restrained, if the pressure continues to rise to a second-stage set value, the other electromagnetic valve is powered on, the other set of main valve bodies are controlled to be opened, large-flow unloading is achieved, the system pressure is rapidly reduced to a safety range, and gradient unloading is achieved.

Description

Technical Field

[0001] This utility model relates to the field of unloading valve technology, and in particular to a gradient unloading valve for an emulsion pump. Background Technology

[0002] Currently, traditional constant pressure unloading valves are widely used in emulsion pump stations in fully mechanized coal mining faces. Their core is a single-stage overflow unloading structure, which fully opens and unloads the system once the system pressure reaches the set value, directly releasing the high-pressure fluid back to the tank. Under normal operating conditions, this type of unloading valve can achieve basic pressure maintenance. However, in high-flow (e.g., 2000 L / min) emulsion pump systems, when unloading the system in a single stage, the system pressure drops suddenly, which can easily cause severe pipeline vibration and intense pressure shock. In addition, instantaneous leakage under high-flow conditions can easily lead to sudden changes in the fluid supply flow rate and violent flow fluctuations. Utility Model Content

[0003] In view of this, the purpose of this utility model is to propose a gradient unloading valve for an emulsion pump to solve the problems of severe pressure shock and severe flow fluctuation under high flow conditions.

[0004] To achieve the above objectives, this utility model provides a gradient unloading valve for an emulsion pump, comprising an unloading valve body. The unloading valve body includes two main valve bodies, each of which is provided with a high-pressure outlet, an unloading return outlet, and a pump supply outlet. The pump supply outlet is connected to the high-pressure outlet, the two high-pressure outlets are connected in series, and the two unloading return outlets are connected in series. Each main valve body is provided with a pilot valve body, and two solenoid valves are provided on one side of the unloading valve body. The two solenoid valves are connected to the two pilot valve bodies one by one, and the set pressure of one pilot valve body is greater than the set pressure of the other pilot valve body.

[0005] When the hydraulic oil system pressure rises to the first-level set value, one solenoid valve is energized, controlling a set of main valve bodies to open, achieving small-flow unloading and suppressing pressure rise. If the pressure continues to rise to the second-level set value, another solenoid valve is energized, controlling another set of main valve bodies to open, achieving large-flow unloading, quickly reducing the system pressure to a safe range, and realizing gradient unloading.

[0006] The pilot valve body has a pilot spring cavity, and a pilot valve spring is disposed within the pilot spring cavity. One side of the pilot spring cavity is connected to a pilot front cavity. One end of the pilot valve spring is connected to a pilot valve core that seals the connection between the pilot spring cavity and the pilot front cavity. The other end of the pilot valve spring is connected to an adjusting screw. The pilot valve body has a damping orifice communicating with the pilot front cavity. The pilot valve body also has an inlet and an outlet communicating with the solenoid valve. The inlet and outlet are respectively connected to the pilot... The front chamber and the pilot spring chamber are connected; a main valve chamber is opened in the main valve body, and the top of the main valve chamber is connected to the pilot front chamber through a damping hole. A main valve core slides in the lower part of the main valve chamber, and the main valve core abuts against the top of the main valve chamber through a main valve spring. The bottom of the main valve chamber is connected to the pump supply port, and the lower side wall of the main valve chamber is connected to the unloading return port. The pump supply port is connected to the pilot front chamber through the main valve oil inlet channel, and the pilot spring chamber is connected to the unloading return port through the main valve return oil pipe.

[0007] Optionally, a first sealing ring is provided between the pilot valve body and the main valve body, which is sleeved on the outside of the main valve oil inlet passage.

[0008] Optionally, a second sealing ring is provided between the pilot valve body and the main valve body, and is sleeved on the outside of the main valve return oil pipeline.

[0009] Optionally, the surface of the unloading valve body is provided with a protective coating.

[0010] Optionally, the two main valve bodies are arranged symmetrically.

[0011] Optionally, the main valve body, pilot valve body, and solenoid valve are detachably mounted on the unloading valve body.

[0012] The beneficial effects of this utility model are as follows: The gradient unloading valve of the emulsion pump provided by this utility model allows a solenoid valve to be energized when the system pressure of the hydraulic oil rises to the first set value, thereby controlling a set of main valve bodies to open and achieve small-flow unloading, suppressing the pressure rise. If the pressure continues to rise to the second set value, another solenoid valve is energized to control another set of main valve bodies to open and achieve large-flow unloading, quickly reducing the system pressure to a safe range and achieving gradient unloading. Under high-flow conditions, the fluid supply flow is stable. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a partial structural schematic diagram of the present invention.

[0016] In the diagram: 1. Unloading valve body; 2. Main valve body; 21. Main valve chamber; 22. Main valve core; 23. Main valve spring; 24. High-pressure outlet; 25. Unloading return port; 26. Pump supply port; 27. Damping orifice; 28. Main valve inlet channel; 29. ​​Main valve return pipe; 3. Pilot valve body; 31. Pilot valve core; 32. Pilot valve spring; 33. Pilot spring chamber; 34. Pilot front chamber; 4. Solenoid valve; 41. Inlet; 42. Outlet. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] like Figures 1 to 2As shown, a gradient unloading valve for an emulsion pump includes an unloading valve body 1, which comprises two main valve bodies 2. Each main valve body 2 is provided with a high-pressure outlet 24, an unloading return port 25, and a pump supply port 26. The pump supply port 26 is connected to the high-pressure outlet 24. The two high-pressure outlets 24 and the two unloading return ports 25 are connected. Each main valve body 2 is provided with a pilot valve body 3. Two solenoid valves 4 are provided on one side of the unloading valve body 1. The two solenoid valves 4 are connected to the two pilot valve bodies 3 one by one. The set pressure of the two pilot valve bodies 3 is different, with the set pressure of one pilot valve body 3 being greater than that of the other pilot valve body 3. The two pilot valve bodies 3 are respectively provided with a first-level set value and a second-level set value, with the first-level set value being less than the second-level set value.

[0020] When the hydraulic oil system pressure is lower than the set value during the loading state, the main valve body 2 is closed, and the high-pressure hydraulic oil that enters the unloading valve body 1 through the pump supply port 26 is output to the system through the high-pressure outlet port 24.

[0021] In the gradient unloading state, when the system pressure of the hydraulic oil rises to the first-level set value, one solenoid valve 4 is energized, controlling a set of main valve bodies 2 to open, realizing small-flow unloading and suppressing pressure rise. If the pressure continues to rise to the second-level set value, another solenoid valve 4 is energized, controlling another set of main valve bodies 2 to open, realizing large-flow unloading, quickly reducing the system pressure to a safe range, and realizing gradient unloading.

[0022] In addition, if any solenoid valve 4 fails, the other solenoid valve 4 can independently complete the unloading control to avoid system pressure loss and achieve redundant control.

[0023] The pilot valve body 3 has a pilot spring cavity 33, and a pilot valve spring 32 is disposed within the pilot spring cavity 33. One side of the pilot spring cavity 33 is connected to a pilot front cavity 34. One end of the pilot valve spring 32 is connected to a pilot valve core 31 that blocks the connection between the pilot spring cavity 33 and the pilot front cavity 34, and the other end of the pilot valve spring 32 is connected to an adjusting screw. The pilot valve body 3 has a damping hole 27 that communicates with the pilot front cavity 34. The pilot valve body 3 has an inlet 41 and an outlet 42 that communicate with the solenoid valve 4. The inlet 41 and the outlet 42 are respectively connected to the pilot front cavity 34. The main valve body 2 has a main valve chamber 21, the top of which is connected to the pilot front chamber 34 through a damping hole 27. A main valve core 22 slides in the lower part of the main valve chamber 21. The main valve core 22 abuts against the top of the main valve chamber 21 through a main valve spring 23. The bottom of the main valve chamber 21 is connected to the pump supply port 26. The lower side wall of the main valve chamber 21 is connected to the unloading return port 25. The pump supply port 26 is connected to the pilot front chamber 34 through the main valve oil inlet channel 28. The pilot spring chamber 33 and the unloading return port 25 are connected through the main valve return oil pipe 29.

[0024] When the solenoid valve 4 is energized, hydraulic oil flows from the pump supply port 26 through the main valve inlet channel 28 to the pilot front chamber 34 in the pilot valve body 3. A small portion of hydraulic oil also flows into the upper part of the main valve chamber 21 through the damping hole 27. The hydraulic oil flowing into the pilot front chamber 34 acts on the pilot valve core 31. When the pressure rises to a level sufficient to overcome the spring force of the pilot valve spring 32, the pilot valve core 31 moves axially, the pilot valve body 3 opens, and the hydraulic oil flows through the pilot spring chamber 33, the main valve return oil pipe 29, and the unloading return port 25, flowing back to the oil tank. At this time, the pilot unloading valve plays an unloading role.

[0025] When the solenoid valve 4 is not energized, the hydraulic oil flows from the inlet through the main valve inlet channel 28 to the pilot chamber 34. A small portion of the hydraulic oil flows through the damping orifice 27 into the upper part of the main valve chamber 21. The hydraulic oil flowing into the pilot chamber 34 flows through the solenoid valve 4 into the pilot spring chamber 33. The hydraulic oil from the pilot chamber 34 passes through the inlet 41, the solenoid valve 4, and the outlet 42 in sequence to the pilot spring chamber 33. After passing through the main valve return oil pipeline 29 and the unloading return port 25, it flows back to the oil tank. The pilot unloading valve does not function.

[0026] The surface of the unloading valve body 1 is provided with a protective coating to facilitate the protection of the unloading valve body 1. The protective coating can be a zinc plating coating or a phosphate coating.

[0027] A first sealing ring is provided between the pilot valve body 3 and the main valve body 2, which is sleeved on the outside of the main valve oil inlet channel 28 for easy sealing.

[0028] A second sealing ring is provided between the pilot valve body 3 and the main valve body 2, which is sleeved on the outside of the main valve return oil pipe 29 for easy sealing.

[0029] The two main valve bodies 2 are symmetrically arranged to facilitate the connection of the two high-pressure liquid outlets 24 and the two unloading return liquid outlets 25.

[0030] The main valve body 2, pilot valve body 3, and solenoid valve 4 are detachably mounted on the unloading valve body 1. In this way, the main valve body 2, pilot valve body 3, and solenoid valve 4 are all independent modules that can be disassembled and replaced individually without disassembling the unloading valve body 1 as a whole.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples. The present invention is not limited to the above-described embodiments, that is, it does not mean that the present invention must rely on the above methods and structures to be implemented. Under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0032] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gradient unloading valve for an emulsion pump, comprising an unloading valve body (1), characterized in that, The unloading valve body (1) includes two main valve bodies (2). Each main valve body (2) is provided with a high-pressure outlet (24), an unloading return port (25), and a pump supply port (26). The pump supply port (26) is connected to the high-pressure outlet (24). The two high-pressure outlets (24) are connected in series, and the two unloading return ports (25) are connected in series. Each main valve body (2) is provided with a pilot valve body (3). Two solenoid valves (4) are provided on one side of the unloading valve body (1). The two solenoid valves (4) are connected to the two pilot valve bodies (3) one by one. The set pressure of one pilot valve body (3) is greater than the set pressure of the other pilot valve body (3).

2. The gradient unloading valve for an emulsion pump according to claim 1, characterized in that, The pilot valve body (3) has a pilot spring cavity (33) inside, and a pilot valve spring (32) is installed inside the pilot spring cavity (33). One side of the pilot spring cavity (33) is connected to a pilot front cavity (34). One end of the pilot valve spring (32) is connected to a pilot valve core (31) that blocks the connection between the pilot spring cavity (33) and the pilot front cavity (34). The other end of the pilot valve spring (32) is connected to an adjusting screw. The pilot valve body (3) has a damping hole (27) that communicates with the pilot front cavity (34). The pilot valve body (3) has an inlet (41) and an outlet (42) that communicate with the solenoid valve (4). The inlet (41) and the outlet (42) are respectively connected to the pilot front cavity (34). The main valve body (2) is connected to the pilot spring cavity (33); a main valve cavity (21) is provided in the main valve body (2), the top of the main valve cavity (21) is connected to the pilot front cavity (34) through the damping hole (27), a main valve core (22) slides in the lower part of the main valve cavity (21), the main valve core (22) is abutted against the top of the main valve cavity (21) through the main valve spring (23), the bottom of the main valve cavity (21) is connected to the pump supply port (26), the lower side wall of the main valve cavity (21) is connected to the unloading return port (25), the pump supply port (26) is connected to the pilot front cavity (34) through the main valve oil inlet channel (28), and the pilot spring cavity (33) is connected to the unloading return port (25) through the main valve return oil pipe (29).

3. The gradient unloading valve for an emulsion pump according to claim 2, characterized in that, A first sealing ring is provided between the pilot valve body (3) and the main valve body (2) and sleeved on the outside of the main valve oil inlet channel (28).

4. The gradient unloading valve for an emulsion pump according to claim 2, characterized in that, A second sealing ring is provided between the pilot valve body (3) and the main valve body (2) and sleeved on the outside of the main valve return oil pipe (29).

5. The gradient unloading valve for an emulsion pump according to claim 1, characterized in that, The surface of the unloading valve body (1) is provided with a protective coating.

6. The gradient unloading valve for an emulsion pump according to claim 1, characterized in that, The two main valve bodies (2) are arranged symmetrically.

7. The gradient unloading valve for an emulsion pump according to claim 1, characterized in that, The main valve body (2), pilot valve body (3) and solenoid valve (4) are detachably mounted on the unloading valve body (1).

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