A mechanically driven control type flow regulating valve

Abstract

The present invention discloses a mechanical drive control type flow regulating valve, which includes a pressure control cavity, a valve seat, an adjustment system, a piston, and a current-limiting plate. The adjustment system includes an adjustment seat and a screw plug and a rectangular spring arranged inside the adjustment seat; the piston is slidably arranged in the pressure control cavity, a current-limiting channel is arranged in the valve seat, slideways corresponding to the current-limiting plate are arranged on both sides of the valve seat, the current-limiting plate is slidably inserted into the current-limiting channel, and both ends are respectively slidably connected with the slideways. The current-limiting plate is used to control the flow cross-sectional area of the current-limiting channel, and a throttle orifice is formed between the upper edge of the current-limiting plate and the valve seat; one end of the current-limiting plate extends into the pressure control cavity and is connected with the piston, and the other end extends into the adjustment seat and is connected with the screw plug through the rectangular spring; the pressure control cavity is connected with a gas source. The present invention realizes real-time adjustment of the flow cross-sectional area, can timely and effectively adjust the flow rate passing through the valve body, and has good practicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of flow control valves, and particularly relates to a mechanically driven control type flow control valve. Background Art

[0002] At present, most flow control valves used in China are for grading and quantitative regulation. The movement of the valve core mostly needs to be controlled by an electromagnetic valve. The finer the adjustment range, the more complex the electromagnetic design, and at the same time, the control program of the electromagnetic valve is also more complex. And installing an electromagnetic valve requires a larger space size, which in turn increases the size and weight of the control valve body. To achieve the purpose of automatic control, various sensors need to be added, which not only increases the manufacturing cost of the electromagnetic valve, but also increases the failure probability synchronously with the increase in the number of electronic components used, increases the maintenance probability of the system, and cannot meet the use requirements under harsh working conditions. The common control valves have high limitations in the use places, high manufacturing and maintenance costs, and the service life and working efficiency under harsh working conditions cannot be guaranteed. Summary of the Invention

[0003] The purpose of the present invention is to provide a mechanically driven control type flow control valve, which drives the piston by controlling the air source, and then drives the flow limiting plate to reciprocate linearly in the flow limiting channel, and then controls the flow cross-sectional area through the flow limiting plate, that is, adjusts the size of the throttle orifice, so as to realize the real-time control of the flow rate of gas passing through the channel, and has good practicability.

[0004] The present invention is mainly realized by the following technical solutions:

[0005] A mechanically driven control type flow control valve includes a pressure control cavity, a valve seat, an adjustment system, a piston, and a flow limiting plate. The adjustment system includes an adjustment seat and a screw plug and a rectangular spring arranged inside the adjustment seat; the pressure control cavity and the adjustment seat are respectively communicated and arranged on the left and right sides of the valve seat. The piston is slidably arranged in the pressure control cavity. A flow limiting channel is arranged in the valve seat. Slideways are arranged on both sides of the valve seat corresponding to the flow limiting plate. The flow limiting plate slidably penetrates through the flow limiting channel and is respectively slidably connected with the slideways at both ends. The flow limiting plate is used to control the flow cross-sectional area of the flow limiting channel. A throttle orifice is formed between the upper edge of the flow limiting plate and the valve seat; one end of the flow limiting plate extends into the pressure control cavity and is connected with the piston, and the other end extends into the adjustment seat and is connected with the screw plug through the rectangular spring; the pressure control cavity is connected with an air source.

[0006] During the use of the present invention, the high-pressure gas source in the pressure control cavity is utilized to drive the piston to overcome the elastic force of the rectangular spring, so as to control the movement of the flow-limiting plate in the sliding groove of the valve seat. When the pressure of the main gas path of the gas source increases, the pressure in the pressure control cavity increases synchronously, pushing the piston to move to the right and reducing the throttling orifice area formed by the flow-limiting plate and the valve seat; when the pressure of the main gas path of the gas source decreases, the pressure in the pressure control cavity decreases synchronously, and the rectangular spring pushes the flow-limiting plate to move to the left, and at this time the throttling orifice area increases. The present invention uses the gas source pressure to push the piston to move, thereby driving the flow-limiting plate to move. The cross-sectional area of the flow-limiting channel is controlled in real time by the flow-limiting plate. The elastic force of the rectangular spring provides a reset force for the flow-limiting plate. The flow-limiting plate moves in real time under the pressure on the piston and the reaction force of the spring, thereby changing the cross-sectional area of the flow path and controlling the flow rate of the gas passing through the channel in real time.

[0007] To better implement the present invention, further, the flow-through cross-section of the valve seat is in a parabolic profile, and the flow-limiting plate is correspondingly provided in a parabolic profile. The flow-through cross-section of the valve seat of the regulating valve adopts a parabolic profile. By using the movement of the flow-limiting plate to change the throttling orifice cross-sectional area, the flow resistance of the regulating valve is changed. And the change of the throttling orifice area starts quickly and then slows down, that is, high pressure and large flow resistance, low pressure and small flow resistance, so that no matter whether low-pressure or high-pressure gas passes through the regulating valve, the gas mass flow rate remains consistent. The flow-limiting plate adopts the parabolic profile of the valve seat at the position of the flow-limiting channel, ensuring that when the regulating valve is used at low pressure, the opening of the gas channel reaches the maximum, and when it rises to the extreme high pressure during use, the opening of the gas channel is the smallest but will not be completely closed.

[0008] To better implement the present invention, further, the pressure control cavity includes a joint, a piston body, a valve core, and a spring. The piston body is fixedly connected to the valve seat. The piston is slidably arranged in the piston body. One end of the piston body is connected to the control gas source through the joint. The valve core is arranged in the central ventilation hole of the joint, and a spring is arranged between the valve core and the piston body.

[0009] When the flow-limiting plate slides to the leftmost side, the flow-limiting plate contacts the right side of the piston body, forming a left limit point; when the flow-limiting plate slides to the rightmost side, it contacts the left side of the adjustment seat, thus forming a right limit point.

[0010] Micro-grooves are opened on the sealing surface of the valve core to control the gas to quickly enter the pressure control cavity, and the piston also responds quickly. When the pressure of the control gas decreases, the gas in the pressure control cavity slowly flows out through the micro-grooves on the sealing surface of the valve core, and the piston then slowly resets. The "quick opening and slow return" movement characteristics of the flow-limiting plate can be achieved. When the gas source changes frequently, the movement frequency and amplitude of the flow-limiting plate can be effectively controlled, greatly improving the service life of the flow-limiting plate and the rectangular spring.

[0011] To better implement the present invention, further, the piston body is connected to the valve seat by screws, and is hermetically connected to the valve seat through an O-ring seal; the adjusting seat is threadedly connected to the valve seat, and is hermetically connected to the valve seat through a gasket.

[0012] To better implement the present invention, further, the joint is hermetically connected to the piston body through an intake sealing ring, and the free end of the piston body is connected to the end plug through an end sealing ring.

[0013] To better implement the present invention, further, the piston is slidably connected to the piston body through a square sealing ring, and one end of the flow-limiting plate is hinged to the piston by a pin. The flow-limiting plate and the piston are hinged by a pin to ensure the smoothness of the piston pushing the flow-limiting plate during oil-free lubricated movement.

[0014] To better implement the present invention, further, the screw plug is threadedly connected to the adjusting seat, and a cross-screw groove is provided at the free end of the screw plug. The screw plug and the adjusting seat are connected by threads, and the initial pre-pressure of the rectangular spring can be adjusted by turning the screw plug with a cross-screwdriver, broadening the flow range of the self-adaptive flow regulating valve.

[0015] To better implement the present invention, further, the screw plug and the adjusting seat are hermetically connected through a plug sealing ring, a rectangular spring is nested at one end of the screw plug close to the flow-limiting plate, and the rectangular spring is connected to the screw plug through a spring pad. The rectangular spring and the screw plug are positioned by the inner hole and supported by the spring pad to ensure good centering during spring compression and rebound.

[0016] To better implement the present invention, further, the regulating valve and the external system, the valve seat and the piston body, the valve seat and the adjusting seat, the piston body and the end plug, and the screw plug and the adjusting seat are all sealed with rubber sealing rings. Utilizing the excellent deformability of rubber, gas sealing is achieved with a relatively small pre-tightening force.

[0017] Advantages of the present invention:

[0018] (1) The present invention drives the piston by controlling the gas source, thereby driving the flow-limiting plate to perform a linear reciprocating motion in the flow-limiting channel, and then controlling the flow cross-sectional area through the flow-limiting plate, that is, adjusting the size of the throttle port, to achieve real-time control of the gas flow rate when passing through the channel, which has good practicability;

[0019] (2) After the flow rate of the valve body is adjusted, the flow rate of the valve does not change with the change of the use environment, and no sensors and electronic control components are required for auxiliary control. The induction adjustment in response to environmental changes is completely automatically adjusted by the mechanical structure characteristics of the valve body. The present invention has the advantages of high reliability, wide application range, and being not limited by size and weight;

[0020] (3) The present invention realizes real-time adjustment of the flow cross-sectional area through a piston, a flow-limiting plate, and a rectangular spring, and can timely and effectively adjust the flow rate passing through the valve body; the regulating valve is a fully mechanical structure, without any circuit components for control, with a compact and small structure, and is stable and reliable;

[0021] (4) The present invention is realized through a one-way valve damping control system composed of a valve core. When the air source changes at a high frequency, it can effectively simulate the movement frequency of the control piston, control the reaction frequency of the regulating valve, and improve the service life of the flow-limiting plate, square sealing ring, and rectangular spring;

[0022] (5) The present invention controls the initial adjustment value of the regulating valve by rotating a screw plug, making the application range of the high regulating valve wider. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the regulating valve of the present invention;

[0024] Figure 2 is a top view of the regulating valve of the present invention.

[0025] Wherein: 1. Spring, 2. Connector, 3. Valve core, 4. Inlet sealing ring, 5. Screw, 6. O-ring, 7. Valve seat, 8. Gasket, 9. Rectangular spring, 10. Adjusting seat, 11. Plug sealing ring, 12. Screw plug, 13. Spring washer, 14. Sealing ring, 15. Flow-limiting plate, 16. Pin, 17. Square sealing ring, 18. Piston, 19. Piston body, 20. End sealing ring, 21. End plug. Detailed Embodiments

[0026] Embodiment 1:

[0027] A mechanically driven control type flow regulating valve, as Figure 1 、 Figure 2 shown, includes a pressure control cavity, a valve seat 7, an adjustment system, a piston 18, and a flow-limiting plate 15. The adjustment system includes an adjusting seat 10 and a screw plug 12 and a rectangular spring 9 arranged inside the adjusting seat 10; the left and right sides of the valve seat 7 are respectively and communicatively provided with a pressure control cavity and an adjusting seat 10. The piston 18 is slidably arranged in the pressure control cavity. A flow-limiting channel is arranged in the valve seat 7. Slideways are provided on both sides of the valve seat 7 corresponding to the flow-limiting plate 15. The flow-limiting plate 15 is slidably inserted into the flow-limiting channel, and both ends are respectively slidably connected to the slideways. The flow-limiting plate 15 is used to control the flow cross-sectional area of the flow-limiting channel. A throttling orifice is formed between the upper edge of the flow-limiting plate 15 and the valve seat 7; one end of the flow-limiting plate 15 extends into the pressure control cavity and is connected to the piston 18, and the other end extends into the adjusting seat 10 and is connected to the screw plug 12 through the rectangular spring 9; the pressure control cavity is connected to the air source.

[0028] Further, the flow-through cross-section of the valve seat 7 is in a parabolic profile, and the current-limiting plate 15 is correspondingly arranged in a parabolic profile.

[0029] During the use of the present invention, the high-pressure gas source in the pressure control cavity is utilized to drive the piston 18 to overcome the elastic force of the rectangular spring 9, so as to control the movement of the current-limiting plate 15 in the sliding groove of the valve seat 7. When the pressure of the main gas path of the gas source increases, the pressure in the pressure control cavity increases synchronously, pushing the piston 18 to move to the right, reducing the throttling orifice area formed by the current-limiting plate 15 and the valve seat 7; when the pressure of the main gas path of the gas source decreases, the pressure in the pressure control cavity decreases synchronously, and the rectangular spring 9 pushes the current-limiting plate 15 to move to the left, and at this time the throttling orifice area increases. The present invention uses the gas source pressure to push the piston 18 to move, thereby driving the current-limiting plate 15 to move. The size of the flow-through cross-section area of the current-limiting channel is controlled in real time by the current-limiting plate 15. The elastic force of the rectangular spring 9 provides a reset acting force for the current-limiting plate 15. The current-limiting plate 15 moves in real time under the pressure received by the piston 18 and the reaction force of the spring 1, thereby changing the flow-through cross-section area and controlling the flow rate of the gas passing through the channel in real time.

[0030] The flow-through cross-section of the valve seat 7 of the regulating valve adopts a parabolic profile. By using the movement of the current-limiting plate 15 to change the throttling orifice cross-section area, the flow resistance of the regulating valve is changed. And the change of the throttling orifice area starts fast and then slows down, that is, high pressure with large flow resistance and low pressure with small flow resistance, so that no matter whether low-pressure or high-pressure gas passes through the regulating valve, the gas mass flow rate remains consistent. The current-limiting plate 15 adopts the parabolic profile of the valve seat 7 at the position of the current-limiting channel, ensuring that when the regulating valve is used at low pressure, the opening of the gas channel reaches the maximum, and when it rises to the ultimate high pressure during use, the opening of the gas channel is the smallest but will not be completely closed.

[0031] The present invention realizes the driving of the piston 18 by controlling the gas source, and further realizes driving the current-limiting plate 15 to perform linear reciprocating motion in the current-limiting channel. Furthermore, the flow-through cross-section area is controlled by the current-limiting plate 15, that is, the size of the throttling orifice is adjusted, so as to realize the real-time control of the flow rate of the gas passing through the channel, and has good practicability.

[0032] Embodiment 2:

[0033] This embodiment is optimized on the basis of Embodiment 1. The pressure control cavity includes a joint 2, a piston body 19, a valve core 3, and a spring 1. The piston body 19 is fixedly connected to the valve seat 7. The piston 18 is slidably arranged in the piston body 19. One end of the piston body 19 is connected to the control gas source through the joint 2. The valve core 3 is arranged in the central ventilation hole of the joint 2, and a spring 1 is arranged between the valve core 3 and the piston body 19.

[0034] Further, the piston body 19 is connected to the valve seat 7 by screws 5, and the piston body 19 and the valve seat 7 are hermetically connected by an O-ring seal 6; the adjusting seat 10 is threadedly connected to the valve seat 7, and the adjusting seat 10 and the valve seat 7 are hermetically connected by a gasket 8.

[0035] Further, the joint 2 is hermetically connected to the piston body 19 by an intake seal ring 4, and the free end of the piston body 19 is connected to the end plug 21 by an end seal ring 20.

[0036] Further, the piston 18 is slidably connected to the piston body 19 by a square seal ring 17, and one end of the flow limiting plate 15 is hinged to the piston 18 by a pin 16.

[0037] When the flow limiting plate 15 slides to the leftmost side, the flow limiting plate 15 contacts the right side of the piston body 19 to form a left limit point; when the flow limiting plate 15 slides to the rightmost side, it contacts the left side of the adjusting seat 10 to form a right limit point.

[0038] The sealing surface of the valve core 3 is provided with micro-grooves to control the rapid entry of gas into the pressure control cavity. The piston 18 also responds quickly. When the pressure of the control gas decreases, the gas in the pressure control cavity slowly flows out through the micro-grooves on the sealing surface of the valve core 3, and the piston 18 then slowly resets, achieving the "quick opening and slow closing" movement characteristic of the flow limiting plate 15. When the gas source changes frequently, the movement frequency and amplitude of the flow limiting plate 15 can be effectively controlled, greatly improving the service life of the flow limiting plate 15 and the rectangular spring 9.

[0039] Other parts of this embodiment are the same as those of Embodiment 1, so they will not be described in detail.

[0040] Embodiment 3:

[0041] This embodiment is optimized on the basis of Embodiment 1 or 2. The screw plug 12 is threadedly connected to the adjusting seat 10, and a cross-screw groove is provided at the free end of the screw plug 12. The screw plug 12 and the adjusting seat 10 are threadedly connected, and by turning the screw plug 12 with a cross-screwdriver, the initial pre-pressure of the rectangular spring 9 can be adjusted, broadening the flow range of the self-adaptive flow regulating valve.

[0042] The screw plug 12 and the adjusting seat 10 are hermetically connected by a plug seal ring 11. A rectangular spring 9 is nested at one end of the screw plug 12 close to the flow limiting plate 15, and the rectangular spring 9 is connected to the screw plug 12 by a spring washer 13. The rectangular spring 9 and the screw plug 12 are positioned by the inner hole and supported by the spring washer 13 to ensure good centering when the spring 1 compresses and rebounds.

[0043] Other parts of this embodiment are the same as those of the above Embodiment 1 or 2, so they will not be described in detail.

[0044] Embodiment 4:

[0045] A mechanically driven and controlled flow regulating valve, as Figure 1 , Figure 2 shown, the control air source access joint 2 is connected to the piston body 19 and is tightly sealed by the intake sealing ring 4. The valve core 3 is inserted into the central vent hole of the joint 2, the spring 1 is sleeved on the other side of the valve core 3, and the other side of the spring 1 is inserted into the groove of the piston body 19. The end plug 21 is connected to the piston body 19 and is sealed by the end sealing ring 20. The pressure control cavity is composed of the end plug 21, the piston body 19, the piston 18, the joint 2, and the valve core 3.

[0046] The square sealing ring 17 is nested in the groove of the piston 18 and is installed inside the piston body 19 together. The square sealing ring 17 can slide freely inside the piston body 19. One side of the flow limiting plate 15 is connected to the piston 18 through the pin 16, and after connection, it is inserted into the slideway designed inside the valve seat 7. The piston body 19 is connected to the valve seat 7 by using the screw 5 and is sealed by the O-ring 6; one side of the adjusting seat 10 is connected to the valve seat 7 and is locked by the self-thread of the adjusting seat 10, and the two are sealed by the gasket 8. The other side of the adjusting seat 10 is installed with the screw plug 12, and the screw plug 12 and the adjusting seat 10 are sealed by the plug sealing ring 11. A rectangular spring 9 is nested on the side of the screw plug 12 close to the flow limiting plate 15, and the screw plug 12 and the rectangular spring 9 are separated by the spring washer 13 in the middle, and one end of the sleeve rectangular spring 9 contacts the flow limiting plate 15.

[0047] As Figure 2 shown, the flow-through cross-section of the valve seat 7 adopts a parabolic profile, and the flow limiting plate 15 adopts the same parabolic profile. When the flow limiting plate 15 slides, the rib on the flow limiting plate 15 is used to control the size of the throttling port area formed with the valve seat 7, and it starts fast and then slows down, so that no matter how the gas pressure passing through the valve body changes, the gas mass velocity remains the same, and when the flow limiting plate 15 slides to the limit position, the valve will not be completely closed and still has flow-through performance.

[0048] As Figure 1 shown, when using the present invention, the valve seat 7 is fixedly installed by using bolts to act as the air inlet, sealed by the sealing ring 14, and an intake pipe is installed on one side of the valve seat 7.

[0049] As Figure 1 shown, when using the present invention, use a cross screwdriver to rotate the screw plug 12 to adjust the initial pre-pressure of the rectangular spring 9, that is, when the system requires a high flow rate, increase the compression amount of the rectangular spring 9, and the initial pre-tightening force is adjusted larger. When a smaller flow rate is required, the pre-tightening force is adjusted smaller accordingly.

[0050] As Figure 1As shown in the figure, when using the present invention, the rectangular spring 9, spring pad 13, and spiral plug 12 form an adjustment system for setting the set value of the gas flow rate passing through the self-adaptive regulating valve. Rotate the spiral plug 12 with a cross screwdriver to increase the compression amount of the rectangular spring 9, improve the pre-tightening force of the flow-blocking movement system, and require a greater pressure in the pressure chamber to push the piston 18, thereby increasing the system adjustment flow rate set value of the self-adaptive regulating valve. When moving away, the flow rate set value decreases, and under the action of a small pressure, the control system can respond.

[0051] The present invention drives the piston 18 by controlling the gas source, and further drives the flow-limiting plate 15 to perform a linear reciprocating motion in the flow-limiting channel. Furthermore, the cross-sectional area of the flow passage is controlled by the flow-limiting plate 15, that is, the size of the throttle port is adjusted, so as to realize the real-time control of the gas flow rate when passing through the channel, and has good practicability.

[0052] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A mechanical drive control type flow regulating valve, characterized in that, It includes a pressure control cavity, a valve seat (7), an adjustment system, a piston (18), and a flow-limiting plate (15). The adjustment system includes an adjustment seat (10) and a screw plug (12) and a rectangular spring (9) arranged inside the adjustment seat (10); on the left and right sides of the valve seat (7), a pressure control cavity and an adjustment seat (10) are respectively and communicatively arranged. The piston (18) is slidably arranged in the pressure control cavity. A flow-limiting channel is arranged in the valve seat (7). Slideways corresponding to the flow-limiting plate (15) are arranged on both sides of the valve seat (7). The flow-limiting plate (15) slidably penetrates through the flow-limiting channel, and both ends are respectively slidably connected to the slideways. The flow-limiting plate (15) is used to control the flow cross-sectional area of the flow-limiting channel. A throttling orifice is formed between the upper edge of the flow-limiting plate (15) and the valve seat (7); one end of the flow-limiting plate (15) extends into the pressure control cavity and is connected to the piston (18), and the other end extends into the adjustment seat (10) and is connected to the screw plug (12) through the rectangular spring (9); the pressure control cavity is connected to a gas source; The pressure control cavity includes a joint (2), a piston body (19), a valve core (3), and a spring (1). The piston body (19) is fixedly connected to the valve seat (7). The piston (18) is slidably arranged in the piston body (19). One end of the piston body (19) is connected to a control gas source through the joint (2). The valve core (3) is arranged in the central ventilation hole of the joint (2). A spring (1) is arranged between the valve core (3) and the piston body (19). The sealing surface of the valve core is provided with air guiding grooves; The flow cross-section of the valve seat (7) is a parabolic profile, and the opening of the flow-limiting plate (15) is correspondingly arranged as a parabolic profile.

2. The mechanical drive control type flow regulating valve according to claim 1, characterized in that The piston body (19) is connected to the valve seat (7) through screws (5), and the piston body (19) and the valve seat (7) are hermetically connected through an O-ring (6); the adjustment seat (10) is threadedly connected to the valve seat (7), and the adjustment seat (10) and the valve seat (7) are hermetically connected through a gasket (8).

3. The mechanical drive control type flow regulating valve according to claim 1, wherein The joint (2) is hermetically connected to the piston body (19) through an intake sealing ring (4). The free end of the piston body (19) is connected to an end plug (21) through an end sealing ring (20).

4. A mechanical drive control type flow regulating valve according to claim 1, characterized in that, The piston (18) is slidably connected to the piston body (19) through a square sealing ring (17). One end of the flow-limiting plate (15) is hinged to the piston (18) through a pin (16).

5. A mechanical drive control type flow regulating valve according to any one of claims 1-4, characterized in that, The screw plug (12) is threadedly connected to the adjustment seat (10), and the free end of the screw plug (12) is provided with a cross-screw groove.

6. The mechanical drive control type flow regulating valve according to claim 5, wherein, The screw plug (12) and the adjustment seat (10) are hermetically connected through a plug sealing ring (11). A rectangular spring (9) is nested at one end of the screw plug (12) close to the flow-limiting plate (15), and the rectangular spring (9) is connected to the screw plug (12) through a spring washer (13).

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