Flow regulating valve and method of controlling the same

Abstract

A flow regulating valve and a control method thereof, the valve is provided with a main channel, a first channel, a second channel and a third channel; the main channel comprises an upper cavity, a middle cavity and a lower cavity which are communicated in sequence from top to bottom; the top of the upper cavity is provided with an upper valve cover, the upper cavity is provided with a first spring and a valve core, one end of the first channel is communicated with the upper cavity; the middle cavity is provided with a rod, one end of the second channel is communicated with the middle cavity; the lower cavity is provided with a piston, the upper end of the piston is connected with the bottom of the rod, the bottom of the lower cavity is provided with a lower valve cover, one end of the third channel is communicated with the cavity between the piston and the lower valve cover. Compared with the prior art, the application combines the advantages of plug-in conical valve and hydraulic control one-way valve, realizes the functions of normally closed, large flow and self-locking when conducting according to the actual application requirements, and can automatically increase the valve core opening degree with the decrease of liquid or gas supply pressure, so that the flow of gas and liquid through the flow regulating valve will not decrease due to the decrease of liquid or gas supply pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of flow valves, and in particular to a flow regulating valve and a control method thereof. Background Art

[0002] In the prior art, valves used for pressure oil or gas mainly include cartridge-type cone valves and hydraulically controlled one-way valves.

[0003] The structure of the existing plug-in cone valve is as follows Figure 1 As shown, its working principle is as follows: when pressurized oil or gas enters from the first port 11, the valve port is in a closed state due to the action of the first compression spring 15 on the upper portion of the cone valve core 14, and the pressurized oil or gas cannot flow from the first port 11 through the cone valve core 14 to the second port 12. When pressurized oil or gas enters from the second port 12 and the pressure is sufficient to overcome the spring force of the first compression spring 15, the gravity of the cone valve core 14, and the friction force of the cone valve core 14, the cone valve core 14 moves upward, opening the valve port channel, and the pressurized oil or gas can flow from the second port 12 through the cone valve core 14 to the first port 11. However, its disadvantage is that the pressurized oil or gas can only flow from the second port 12 to the first port 11, but cannot flow from the first port 11 to the second port 12.

[0004] The structure of the existing hydraulically controlled one-way valve is as follows Figure 2 As shown, its operating principle is as follows: when there is no pressurized oil at the control oil port 22, the hydraulically controlled one-way valve operates like a conventional one-way valve. That is, pressurized oil cannot flow from the oil outlet 28 to the oil inlet 27; it can only enter through the oil inlet 27 and exit through the oil outlet 28. When pressurized oil flows into the bottom cavity of the hydraulically controlled one-way valve piston 26 from the control oil port 22, the hydraulically controlled one-way valve piston 26 moves upward, pushing the push rod 25 upward as well. When this upward thrust exceeds the spring force of the second compression spring 24, the weight of the hydraulically controlled one-way valve spool 23, and the friction between the hydraulically controlled one-way valve spool 23 and the valve plate 21, the hydraulically controlled one-way valve spool 23 moves upward, opening the valve. Hydraulic oil then flows from the oil inlet 27 and out of the oil outlet 28. When there is no pressurized oil flowing into the control oil port 22, the upward thrust of the push rod 25 disappears. Under the spring force of the second compression spring 24, the hydraulically controlled one-way valve spool 23 moves downward, closing the valve. This prevents hydraulic oil from flowing out of the oil inlet 27 through the oil outlet 28. Furthermore, when pressurized oil is passed through the control oil port 22, the hydraulically controlled one-way valve can also allow oil to enter through the oil outlet 28 and flow out of the oil inlet 27. Compared to a cartridge-type poppet valve, the hydraulically controlled one-way valve allows oil to enter through the oil inlet 27 and flow out through the oil outlet 28, or vice versa. However, its disadvantage is that as the liquid or gas supply pressure decreases, the flow rate of gas and liquid through the valve body also decreases, making it unable to meet usage requirements. Summary of the Invention

[0005] The present application provides a flow regulating valve and a control method thereof to solve the problem that when the liquid supply or gas supply pressure of the existing valve decreases, the flow rate of gas and liquid flowing through the valve body also decreases, thereby failing to meet usage requirements.

[0006] Based on the above-mentioned existing plug-in cone valve and hydraulically controlled one-way valve, this application designs a flow regulating valve that combines the advantages of both and meets actual application needs, namely, normally closed, large flow, and self-locking when turned on, and can automatically increase the valve core opening as the liquid or gas supply pressure decreases, so that the flow rate of gas and liquid flowing through the valve body will not decrease.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions.

[0008] In one aspect, a flow regulating valve is provided, comprising a valve body, wherein a main channel, a first channel, a second channel, and a third channel are provided in the valve body; the main channel comprises an upper cavity, a middle cavity, and a lower cavity connected in sequence from top to bottom;

[0009] An upper valve cover is provided on the top of the upper cavity, and a first spring and a valve core are provided in the upper cavity, wherein the upper end of the first spring abuts against the upper valve cover, and the lower end abuts against the valve core; a fourth channel is provided in the upper valve cover, one end of the fourth channel is communicated with the first channel, and the other end is communicated with the cavity between the upper valve cover and the valve core; one end of the first channel is communicated with the upper cavity;

[0010] A first rod is provided in the middle cavity, the first rod is located directly below the valve core, and a second spring is sleeved on the first rod; one end of the second channel is connected to the middle cavity;

[0011] A piston is provided in the lower cavity, and the upper end of the piston is connected to the bottom of the first rod; a lower valve cover is provided at the bottom of the lower cavity, and one end of the third channel is connected to the cavity between the piston and the lower valve cover; a through hole is provided in the middle of the lower valve cover, and a second rod is provided in the through hole, the upper end of the second rod is fixedly connected to the bottom of the piston, and the lower end is provided with an annular groove along the circumference of the second rod; a fifth channel is provided in the inner edge of the lower valve cover at a direction perpendicular to the second rod, a ball is provided at one end of the fifth channel close to the second rod, and an adjusting nut is provided at the other end, and a third spring is provided between the adjusting nut and the ball.

[0012] In some embodiments, a return spring is further provided between the piston and the lower valve cover.

[0013] In some embodiments, the bottom of the valve core is truncated cone-shaped; a valve core sleeve is provided in the upper cavity, and the shape of the valve core sleeve matches the shape of the valve core.

[0014] In some embodiments, the diameters of the upper cavity and the lower cavity are larger than that of the middle cavity.

[0015] In some embodiments, the other end of the first channel is connected to a gas source, and the other end of the third channel is connected to the other end of the first channel through a valve; or

[0016] The other end of the first channel is connected to a first gas source, the other end of the third channel is connected to a second gas source, and a valve is provided between the third channel and the second gas source.

[0017] In some embodiments, the valve is a normally-off solenoid valve.

[0018] In another aspect, a control method for the flow control valve is provided, comprising the following steps:

[0019] Open the valve to open the flow regulating valve;

[0020] Loosen the adjusting nut and close the valve to close the flow regulating valve.

[0021] The present application has at least the following technical effects or advantages: it combines the advantages of the plug-in cone valve and the hydraulically controlled one-way valve, and realizes the functions of normally closed, large flow, and self-locking when conductive according to actual application requirements, and can automatically increase the valve core opening as the liquid supply or gas supply pressure decreases, so that the flow rate of gas and liquid flowing through the flow regulating valve will not decrease due to the decrease in liquid supply or gas supply pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of an existing cartridge cone valve;

[0023] Figure 2 It is a structural diagram of an existing hydraulically controlled one-way valve;

[0024] Figure 3 This is a structural diagram of a flow control valve in one embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the principle of a flow control valve in one embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] See also Figure 3 and Figure 4A flow control valve includes a valve body 1, which is provided with a main channel, a first channel 201, a second channel 202, and a third channel 203. The main channel includes an upper cavity 301, a middle cavity 302, and a lower cavity 303, which are connected from top to bottom. Preferably, the upper cavity 301 and the lower cavity 303 have larger diameters than the middle cavity 302.

[0028] The upper valve cover 401 is located at the top of the upper cavity 301. A first spring 501 and a valve core 6 are located within the upper cavity 301. The upper end of the first spring 501 abuts the upper valve cover 401, while the lower end abuts the valve core 6. A fourth channel 204 is located within the upper valve cover 401. One end of the fourth channel 204 communicates with the first channel 201, and the other end communicates with the cavity between the upper valve cover 401 and the valve core 6. One end of the first channel 201 communicates with the upper cavity 301. Preferably, the bottom of the valve core 6 is truncated conically. A valve core sleeve 601 is located within the upper cavity 301, the shape of which matches that of the valve core 6.

[0029] A first rod 701 is provided in the middle cavity 302 and is located directly below the valve core 6 . A second spring 502 is sleeved on the first rod 701 . One end of the second channel 202 is communicated with the middle cavity 302 .

[0030] A piston 8 is positioned within the lower cavity 303, the upper end of which is connected to the bottom of the first rod 701. A lower valve cover 402 is positioned at the bottom of the lower cavity 303, and one end of the third channel 203 communicates with the cavity between the piston 8 and the lower valve cover 402. A through hole is positioned in the middle of the lower valve cover 402, within which a second rod 702 is positioned. The upper end of the second rod 702 is fixedly connected to the bottom of the piston 8, and the lower end of the second rod 702 is provided with an annular groove 703 along the circumference of the second rod 702. A fifth channel is positioned perpendicularly within the lower valve cover 402, with a ball bearing 901 positioned at one end of the fifth channel, near the second rod 702, and an adjusting nut 902 positioned at the other end. A third spring 503 is positioned between the adjusting nut 902 and the ball bearing 901.

[0031] When installing the above flow control valve, Figure 4 As shown, the other end of the first channel 201 can be connected to the gas source (not shown in the figure), the other end of the third channel 203 is connected to the other end of the first channel 201 through the valve 10, and the second channel 202 is connected to the gas / liquid end.

[0032] Alternatively, the other end of the first channel 201 may be connected to a first gas source, and the other end of the third channel 203 may be connected to a second gas source. A valve may be provided between the third channel 203 and the second gas source. The valve may be a normally-off solenoid valve, preferably a two-position normally-off solenoid valve. The second channel 202 may be connected to the gas / liquid end.

[0033] After the flow control valve is installed, the valve 10 is normally closed, the flow passage from the first channel 201 to the second channel 202 is blocked, and the high-pressure fluid cannot flow from the first channel 201 to the second channel 202. The adjusting nut is normally tightened.

[0034] When the flow control valve needs to be opened, the valve 10 is opened, and the high-pressure fluid flows from the third channel 203 into the lower chamber 303 and applies an upward thrust to the bottom of the piston 8, driving the first rod 701 to move upward and contact the bottom of the valve core 6. It continues to move upward to push open the valve core 6, thereby opening the flow path from the first channel 201 to the second channel 202, and the high-pressure fluid can flow from the first channel 201 to the second channel 202. At the same time, the second rod 702 also moves upward, and the ball 901 is stuck in the annular groove 703 under the action of the third spring 503, thereby limiting the first rod 701 to a position that allows the valve core 6 to open.

[0035] After the flow control valve is opened, as the liquid or gas supply pressure of the first gas source decreases, the downward force on the top of the valve core 6 (the sum of the force applied by the first spring 501 and the liquid or gas supply pressure) decreases, while the upward force on the bottom of the valve core 6 remains unchanged, thereby causing the second spring 502 to push the valve core 6 upward, causing the opening of the valve core 6 to increase, so that the flow rate of gas and liquid flowing through the flow control valve will not decrease due to the decrease in liquid or gas supply pressure.

[0036] When the flow regulating valve needs to be closed, the valve 10 is closed to cut off the high-pressure fluid flowing from the third channel 203. At the same time, the adjusting nut 902 is loosened to unlock the first rod 701. The first rod 701 is reset under the action of the first spring 501, and the valve core 6 falls to close the flow regulating valve.

[0037] As a preferred solution, a return spring (not shown in the figure) can be added between the piston 8 and the lower valve cover 402 so that when the flow regulating valve is closed, the first rod 701 is reset under the joint action of the first spring 501 and the return spring, and the closing speed is faster.

[0038] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0039] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved and are not intended to imply that the objects so described must have a given order in time, space, ranking, or in any other manner.

[0040] Although the present invention has been described with respect to a limited number of embodiments, it will be apparent to those skilled in the art, having benefit of the foregoing description, that other embodiments are contemplated within the scope of the invention thus described. Furthermore, it should be noted that the language used in this specification has been selected primarily for readability and didactic purposes, rather than for the purpose of explaining or limiting the subject matter of the present invention. Consequently, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative rather than restrictive of the scope of the invention, which is defined by the appended claims.

[0041] Finally, it should be noted that the present invention does not explain in detail the common knowledge recognized by technicians in this field. The above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow control valve, comprising a valve body, characterized in that: The valve body is provided with a main channel, a first channel, a second channel and a third channel; the main channel includes an upper cavity, a middle cavity and a lower cavity which are sequentially connected from top to bottom; An upper valve cover is provided on the top of the upper cavity, and a first spring and a valve core are provided in the upper cavity, wherein the upper end of the first spring abuts against the upper valve cover, and the lower end abuts against the valve core; a fourth channel is provided in the upper valve cover, one end of the fourth channel is communicated with the first channel, and the other end is communicated with the cavity between the upper valve cover and the valve core; one end of the first channel is communicated with the upper cavity; A first rod is provided in the middle cavity, the first rod is located directly below the valve core, and a second spring is sleeved on the first rod; one end of the second channel is connected to the middle cavity; A piston is provided in the lower cavity, the upper end of the piston being connected to the bottom of the first rod; a lower valve cover is provided at the bottom of the lower cavity, one end of the third channel is connected to the cavity between the piston and the lower valve cover; a through hole is provided in the middle of the lower valve cover, a second rod is provided in the through hole, the upper end of the second rod is fixedly connected to the bottom of the piston, and the lower end is provided with an annular groove along the circumference of the second rod; a fifth channel is provided in the inner edge of the lower valve cover perpendicular to the second rod, a ball is provided at one end of the fifth channel close to the second rod, and an adjusting nut is provided at the other end, and a third spring is provided between the adjusting nut and the ball; When the flow control valve is installed, the other end of the first channel is connected to the gas source, the other end of the third channel is connected to the other end of the first channel through the valve, and the second channel is connected to the gas / liquid end; After the flow control valve is installed, the valve is closed in a normal state, the flow passage from the first channel to the second channel is in a closed state, and the high-pressure fluid cannot flow from the first channel to the second channel; the adjusting nut is in a tightened state in a normal state; When the flow regulating valve needs to be opened, the valve is opened, and the high-pressure fluid flows from the third channel into the lower chamber and applies an upward thrust to the bottom of the piston, driving the first rod to move upward and contact the bottom of the valve core. The rod continues to move upward to push open the valve core, thereby opening the flow passage from the first channel to the second channel, and the high-pressure fluid can flow from the first channel to the second channel. At the same time, the second rod also moves upward, and the ball is stuck in the annular groove under the action of the third spring, thereby limiting the first rod to a position that allows the valve core to open. After the flow control valve is opened, as the liquid or gas supply pressure of the first gas source decreases, the downward force on the top of the valve core decreases, while the upward force on the bottom of the valve core remains unchanged, thereby causing the second spring to push the valve core upward, causing the valve core to open wider, so that the flow rate of gas and liquid flowing through the flow control valve will not decrease due to the decrease in liquid or gas supply pressure; When the flow regulating valve needs to be closed, the valve is closed to cut off the high-pressure fluid flowing from the third channel, and at the same time, the adjusting nut is loosened to unlock the first rod. The first rod is reset under the action of the first spring, and the valve core falls to close the flow regulating valve; A return spring is added between the piston and the lower valve cover, so that when the flow regulating valve is closed, the first rod is reset under the joint action of the first spring and the return spring, and the closing speed is faster.

2. The flow control valve according to claim 1, characterized in that: A return spring is further provided between the piston and the lower valve cover.

3. The flow control valve according to claim 1, characterized in that: The bottom of the valve core is in a truncated cone shape; a valve core sleeve is provided in the upper cavity, and the shape of the valve core sleeve matches the shape of the valve core.

4. The flow control valve according to claim 1, characterized in that: The diameters of the upper cavity and the lower cavity are larger than those of the middle cavity.

5. The flow control valve according to any one of claims 1 to 4, characterized in that: Another connection mode of the flow regulating valve: the other end of the first channel is connected to the first gas source, the other end of the third channel is connected to the second gas source, and a valve is provided between the third channel and the second gas source.

6. The flow control valve according to claim 5, characterized in that: The valve is a normally-off solenoid valve.

7. A method for controlling a flow control valve according to claim 5 or 6, characterized in that: The steps include: Open the valve to open the flow regulating valve; Loosen the adjusting nut and close the valve to close the flow regulating valve.

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