Stepless fine adjustment type regulating valve

Abstract

The stepless fine adjustment type regulating valve comprises a valve body, a valve cover, a valve rod and a driving device, an inlet cavity, an outlet cavity, a central flow channel, a middle cavity and a valve seat are arranged in the valve body, the valve cover covers the upper end of the valve body, the valve rod penetrates through the valve cover and is in transmission connection with the driving device, and a valve clack at the lower end is in sealing fit with the valve seat. An adjusting seat ring in a cover cavity limits rotation through an anti-rotation structure, the upper end and the lower end of a spiral guide rod are limited to the adjusting seat ring and the valve cover respectively, an adjusting sleeve at the upper end of the valve cover can push the adjusting seat ring to ascend and descend through threaded connection, and therefore the screw pitch of the spiral guide rod is changed. The guide ring on the valve rod is matched with the spiral guide rod and spirally moves along the spiral guide rod along with rotation of the valve rod to drive the valve rod to ascend and descend. The stepless fine adjustment of the lifting amount of the valve rod is achieved, and the beneficial effects of being high in adjustment precision, wide in adaptive scene, low in operation and maintenance cost, stable in operation and the like are achieved.

Description

Technical Field

[0001] This invention relates to improvements in the field of valves, and more particularly to an improved invention of a stepless fine-tuning control valve. Background Technology

[0002] In many fields such as industrial production, fluid transportation, and HVAC, control valves are core devices for precisely controlling fluid flow, pressure, and temperature. Their adjustment accuracy directly affects the stability of production processes, energy efficiency, and system operational safety. Traditional control valves generally utilize drive devices, including handwheels, turbines, pneumatic, hydraulic, electric, or pneumatic-hydraulic actuators. The drive device rotates the valve stem nut, which in turn moves the valve stem and valve disc up and down. The valve stem and valve stem nut are connected by a trapezoidal thread. The pitch of the trapezoidal thread has several fixed standard values. Once a fixed pitch is selected, it cannot be adjusted. That is, when fine adjustments to fluid parameters are needed, the amount of rise and fall of the valve stem per revolution is fixed under a fixed pitch, making it impossible to achieve precise control of small amplitudes. This results in very low accuracy for the control valve, and changing the actuator parameters after they are set is relatively troublesome. As a control valve, it requires precise values ​​for flow, stability, and pressure during adjustment. Therefore, traditional control valves cannot be precisely adjusted, leading to poor applicability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a stepless fine-tuning regulating valve.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This stepless fine-tuning regulating valve includes a valve body, a valve cover, a valve stem, and a driving device. The valve body is provided with an inlet cavity, an outlet cavity, a central flow channel, a middle cavity, and a valve seat. The valve cover is fitted onto the upper end of the valve body. The valve stem can be raised and lowered through the valve cover, and the upper end of the valve stem is connected to the driving device. The lower end of the valve stem extends into the middle cavity of the valve body, and a valve disc is provided at the lower end of the valve stem. The valve disc and the valve seat are sealed together. The valve cover has a cover cavity, and a spiral guide rod and an adjusting seat ring are provided within the cover cavity for adjustment. The valve seat ring can slide up and down on the valve stem, and an anti-rotation structure is provided between the adjusting seat ring and the valve cover. The spiral guide rod is arranged around the valve stem, and the pitch of the spiral guide rod is adjustable. The upper end of the spiral guide rod is limited to the adjusting seat ring, and the lower end of the spiral guide rod is limited to the valve cover. An adjusting sleeve threadedly connected to the upper end of the valve cover is provided. The upper end of the adjusting sleeve is exposed outside the valve cover, and the lower end of the adjusting sleeve abuts against the upper end of the adjusting seat ring. The valve stem can move through the adjusting sleeve. A guide ring is fixed on the valve stem, and a guide hole is provided in the guide ring. The corresponding spiral guide rod matches and passes through the guide hole. The guide ring can move spirally along the spiral guide rod.

[0005] The inner diameter of the guide hole is smaller in the middle and larger at both ends, and it has an arc transition.

[0006] The lower end of the valve stem is provided with a fixed sleeve, the valve disc is snapped into the fixed sleeve, a first anti-rotation horizontal pin is provided on one side of the valve disc, and a first anti-rotation vertical groove is provided on the corresponding inner wall of the valve body, the first anti-rotation horizontal pin and the first anti-rotation vertical groove cooperate with each other.

[0007] The lower end of the valve cover is fitted with a limiting sleeve, and the corresponding valve stem passes through the limiting sleeve. The lower end of the corresponding valve stem is provided with a step, which is matched with the limiting sleeve for limiting.

[0008] A sealing ring is provided between the valve stem and the lower end of the valve cover.

[0009] The anti-rotation structure includes a matching second anti-rotation horizontal pin and a second anti-rotation vertical groove. The second anti-rotation horizontal pin is located on one side of the adjusting seat ring, and the second anti-rotation vertical groove is located on the inner wall of the valve cover.

[0010] The lower end of the spiral guide rod is detachably connected to a first anti-rotation vertical rod, and the corresponding valve cover is provided with a first anti-rotation hole.

[0011] The upper end of the spiral guide rod is detachably connected to a second anti-rotation vertical rod, and the corresponding adjustment seat ring is provided with a second anti-rotation hole.

[0012] After the spiral guide rod passes through the guide ring, the upper and lower ends of the spiral guide rod are respectively welded with a second anti-rotation vertical rod and a first anti-rotation vertical rod. The corresponding adjusting seat ring is provided with a second anti-rotation hole, and the valve cover is provided with a first anti-rotation hole.

[0013] The beneficial effects of this invention are as follows: 1. The pitch of the spiral guide rod can be infinitely adjusted through the adjusting sleeve, enabling precise control of the valve stem's lifting and lowering, completely solving the problem of insufficient precision in traditional regulating valves; 2. No need to replace the transmission components, simply rotating the adjusting sleeve switches the adjustment precision, significantly reducing parts and maintenance costs, minimizing downtime, and improving the system's continuous operation capability; 3. The finely adjustable pitch ensures a smooth transition in the valve stem's lifting and lowering action, avoiding sudden changes in flow, effectively reducing system operation risks, and improving safety and reliability; 4. The special diameter design of the guide hole avoids interference with the spiral guide rod. Attached Figure Description

[0014] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the valve in the closed state of the present invention; Figure 2 This is a schematic diagram of the valve in the open state of the present invention; Figure 3 For the present invention Figure 1 AA section view; Figure 4A schematic diagram of the actuator drive structure for this invention. Detailed Implementation

[0016] The accompanying drawings illustrate the structure of the present invention, and further details will be described below in conjunction with the drawings. In this embodiment, the components included in the drawings... Figure 1-4 The stepless fine-tuning regulating valve includes a valve body 1, a valve cover 2, a valve stem 3, and a drive device 4. The valve body 1 has an inlet cavity 5, an outlet cavity 6, a central flow channel 7, a central cavity 8, and a valve seat 9. The inlet cavity 5 and outlet cavity 6 are located on the left and right sides of the central flow channel 7, respectively. The central cavity 8 is located above the central flow channel 7. The valve seat 9 is located at the upper end of the central flow channel 7. The valve cover 2 is fitted onto the upper end of the valve body 1. The valve stem 3 can be raised and lowered through the valve cover 2, and its upper end is connected to the drive device 4. The lower end of the valve stem 3 extends into the central cavity 8 of the valve body 1. A valve disc 10 is provided at the lower end of the valve stem 3, and the valve disc 10 is sealed to the valve seat 9. The valve cover 2 has a cover cavity 11, which contains a spiral guide rod 12 and an adjusting seat ring 13. The adjusting seat ring 13 can... The valve stem 12 is slidably mounted on the valve stem 3, and an anti-rotation structure is provided between the adjusting seat ring 13 and the valve cover 2. The spiral guide rod 12 is arranged around the valve stem 3, and the pitch of the spiral guide rod 12 is adjustable. The upper end of the spiral guide rod 12 is limited to the adjusting seat ring 13, and the lower end of the spiral guide rod 12 is limited to the valve cover 2. The upper end of the valve cover 2 is threadedly connected to the adjusting sleeve 14, the upper end of the adjusting sleeve 14 is exposed outside the valve cover 2, and the lower end of the adjusting sleeve 14 abuts against the upper end of the adjusting seat ring 13. The valve stem 3 can move through the adjusting sleeve 14. The valve stem 3 is provided with a guide ring 15, which is fixed by screws 29. The guide ring 15 is provided with a guide hole 16, and the corresponding spiral guide rod 12 passes through the guide hole 16. The guide ring 15 can move spirally along the spiral guide rod 12.

[0017] The core adjustment principle of this invention is based on the cooperation between the adjustable pitch helical guide rod 12 and the guide ring 15. The specific working process is as follows: Pre-adjustment stage of pitch: Rotate the adjusting sleeve 14 exposed outside the valve cover 2. Since the adjusting sleeve 14 is threadedly connected to the valve cover 2, the adjusting sleeve 14 will rise and fall vertically. The lower end of the adjusting sleeve 14 abuts against the adjusting seat ring 13. When the adjusting sleeve 14 moves down, it pushes the adjusting seat ring 13 to slide downward in the cover cavity 11 of the valve cover 2. When the adjusting sleeve 14 moves up, the adjusting seat ring 13 is reset by the spiral guide rod 12. The anti-rotation structure between the adjusting seat ring 13 and the valve cover 2 can prevent the adjusting seat ring 13 from rotating. When the adjusting seat ring 13 moves up and down, it will drive the upper end of the spiral guide rod 12 to rise and fall synchronously. The lower end of the spiral guide rod 12 is limited to the valve cover 2, thereby changing the degree of curvature of the spiral guide rod 12, realizing stepless adjustment of the pitch, and meeting the accuracy requirements of the valve stem 3's lifting amplitude under different working conditions. When the adjusting seat ring 13 is in the highest position, the spiral guide rod 12 is in the maximum extension state, and the pitch is the largest at this time. When the spiral guide rod 12 is compressed and restricted by the guide ring 15, the pitch is the smallest at this time.

[0018] During valve regulation: The drive device 4 (handwheel, turbine, pneumatic, hydraulic, electric, etc.) drives the valve stem 3 to rotate, and the guide ring 15 on the valve stem 3 rotates synchronously with the valve stem 3. Since the spiral guide rod 12 passes through the guide hole 16 of the guide ring 15, under the spiral guidance of the spiral guide rod 12, the guide ring 15 will move spirally along the spiral guide rod 12, thereby driving the valve stem 3 to achieve lifting and lowering actions. When the valve stem 3 descends, it will drive the lower valve disc 10 to move closer to the valve seat 9 until the valve disc 10 and the valve seat 9 are sealed together, closing the valve passage; when the valve stem 3 rises, the valve disc 10 moves away from the valve seat 9, opening the valve passage and realizing the flow and flow regulation of the fluid.

[0019] As a further improved embodiment, the inner diameter of the guide hole 16 is smaller in the middle and larger at both ends, with an arc-shaped transition. Since the portion of the helical guide rod 12 that passes through the guide hole 16 is a helically bent cylindrical shape, if the guide hole 16 were a straight hole, interference would occur when the helical guide rod 12 passes through it. Therefore, using the aforementioned specially shaped guide hole 16 effectively avoids interference with the helical guide rod 12, ensuring smooth movement.

[0020] As a further improved specific implementation, the lower end of the valve stem 3 is provided with a fixing sleeve 17, and the lower end of the valve stem 3 is provided with a lower limit position of the fixing sleeve 17. The valve disc 10 is snapped into the fixing sleeve 17. Specifically, the valve disc 10 is sleeved on the lower end of the fixing sleeve 17, and there is a snap-fit ​​groove and a snap-fit ​​head between the two. A first anti-rotation horizontal pin 18 is provided on one side of the valve disc 10, and a first anti-rotation vertical groove 19 is provided on the inner wall of the corresponding valve body 1. The first anti-rotation horizontal pin 18 and the first anti-rotation vertical groove 19 slide vertically and are circumferentially limited, which can prevent the valve disc 10 from rotating with the valve stem 3 and ensure the precise sealing fit between the valve disc 10 and the valve seat 9.

[0021] As a further improved specific implementation, a limiting sleeve 20 is embedded at the lower end of the valve cover 2, and the corresponding valve stem 3 passes through the limiting sleeve 20. The lower end of the corresponding valve stem 3 is provided with a step 21, which cooperates with the limiting sleeve 20 to limit the maximum upward stroke of the valve stem 3 and prevent the valve stem 3 from detaching from the valve body 1.

[0022] As a further improved specific implementation, a sealing ring 22 is provided between the valve stem 3 and the lower end of the valve cover 2, and an annular groove is provided on the corresponding valve cover 2. The sealing ring is embedded in the annular groove. Preferably, the sealing ring is an O-ring, and multiple layers can be provided, which effectively improves the sealing performance of the valve cover 2 and prevents fluid leakage.

[0023] As a further improved specific implementation, the anti-rotation structure includes a matching second anti-rotation horizontal pin 23 and a second anti-rotation vertical groove 24. The second anti-rotation horizontal pin 23 is disposed on one side of the adjusting seat ring 13, and the second anti-rotation vertical groove 24 is disposed on the inner wall of the valve cover 2. The second anti-rotation horizontal pin 23 is restricted to sliding up and down within the second anti-rotation vertical groove 24 to restrict the adjusting seat ring 13 from rotating and affecting the pitch adjustment of the spiral guide rod 12.

[0024] As a further improved specific implementation, the lower end of the spiral guide rod 12 is detachably connected to a first anti-rotation vertical rod 25, preferably by a threaded connection. The corresponding valve cover 2 is provided with a first anti-rotation hole 26. The first anti-rotation vertical rod 25 is inserted into the first anti-rotation hole 26 to limit the twisting of the lower end of the spiral guide rod 12. The first anti-rotation vertical rod 25 is detachable to facilitate the spiral guide rod 12 passing through the guide ring 15.

[0025] As a further improved specific implementation, the upper end of the spiral guide rod 12 is detachably connected to a second anti-rotation vertical rod 27, preferably by a threaded connection. The corresponding adjusting seat ring 13 is provided with a second anti-rotation hole 28. The second anti-rotation vertical rod 27 is matched and inserted into the second anti-rotation hole 28 to limit the upper end of the spiral guide rod 12 from twisting. The second anti-rotation vertical rod 27 is detachable to facilitate the spiral guide rod 12 passing through the guide ring 15.

[0026] As a further improved specific implementation, after the spiral guide rod 12 passes through the guide ring 15, the lower end of the spiral guide rod 12 is welded to the first anti-rotation vertical rod 25, and the upper end of the spiral guide rod 12 is welded to the second anti-rotation vertical rod 27. The corresponding valve cover 2 is provided with a first anti-rotation hole 26, and the first anti-rotation vertical rod 25 is matched and inserted into the first anti-rotation hole 26. The corresponding adjusting seat ring 13 is provided with a second anti-rotation hole 28, and the second anti-rotation vertical rod 27 is matched and inserted into the second anti-rotation hole 28.

[0027] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stepless fine-tuning regulating valve, comprising a valve body, a valve cover, a valve stem, and a driving device, wherein the valve body is provided with an inlet chamber, an outlet chamber, a central flow channel, a central cavity, and a valve seat; the valve cover is fitted onto the upper end of the valve body; the valve stem is vertically and vertically mounted on the valve cover, and the upper end of the valve stem is connected to the driving device for transmission; the lower end of the valve stem extends into the central cavity of the valve body; a valve disc is provided at the lower end of the valve stem, and the valve disc is sealed to the valve seat; characterized in that: The valve cover has a cover cavity containing a spiral guide rod and an adjusting seat ring. The adjusting seat ring can slide up and down on the valve stem, and an anti-rotation structure is provided between the adjusting seat ring and the valve cover. The spiral guide rod is arranged around the valve stem, and the pitch of the spiral guide rod is adjustable. The upper end of the spiral guide rod is limited to the adjusting seat ring, and the lower end of the spiral guide rod is limited to the valve cover. An adjusting sleeve threadedly connected to the upper end of the valve cover is provided, with the upper end of the adjusting sleeve protruding outside the valve cover and the lower end of the adjusting sleeve abutting against the upper end of the adjusting seat ring. The valve stem can move through the adjusting sleeve. A guide ring is fixed on the valve stem, and a guide hole is provided in the guide ring. The corresponding spiral guide rod matches and passes through the guide hole, and the guide ring can move spirally along the spiral guide rod.

2. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: The inner diameter of the guide hole is smaller in the middle and larger at both ends, and it has an arc transition.

3. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: The lower end of the valve stem is provided with a fixed sleeve, the valve disc is snapped into the fixed sleeve, a first anti-rotation horizontal pin is provided on one side of the valve disc, and a first anti-rotation vertical groove is provided on the corresponding inner wall of the valve body, the first anti-rotation horizontal pin and the first anti-rotation vertical groove cooperate with each other.

4. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: The lower end of the valve cover is fitted with a limiting sleeve, and the corresponding valve stem passes through the limiting sleeve. The lower end of the corresponding valve stem is provided with a step, which is matched with the limiting sleeve for limiting.

5. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: A sealing ring is provided between the valve stem and the lower end of the valve cover.

6. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: The anti-rotation structure includes a matching second anti-rotation horizontal pin and a second anti-rotation vertical groove. The second anti-rotation horizontal pin is located on one side of the adjusting seat ring, and the second anti-rotation vertical groove is located on the inner wall of the valve cover.

7. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: The lower end of the spiral guide rod is detachably connected to a first anti-rotation vertical rod, and the corresponding valve cover is provided with a first anti-rotation hole.

8. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: The upper end of the spiral guide rod is detachably connected to a second anti-rotation vertical rod, and the corresponding adjustment seat ring is provided with a second anti-rotation hole.

9. The stepless fine-tuning regulating valve as described in claim 1, characterized in that: After the spiral guide rod passes through the guide ring, the upper and lower ends of the spiral guide rod are respectively welded with a second anti-rotation vertical rod and a first anti-rotation vertical rod. The corresponding adjusting seat ring is provided with a second anti-rotation hole, and the valve cover is provided with a first anti-rotation hole.

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