Pneumatic single-seat regulating valve

Abstract

The utility model provides a pneumatic single-seat regulating valve, which relates to the technical field of single-seat regulating valves, and comprises a valve body and a valve rod, a valve seat of the valve body is provided with a cavity through which the valve rod passes, and the rod surface of the valve rod is fixedly connected with a main gear ring positioned in the cavity. The pneumatic telescopic rod stretches out and draws back to achieve movement of the main rack, then the main gear ring drives the valve rod to rotate, the valve body is opened and closed, the worm and the worm gear ring are arranged, the worm is meshed with the worm gear ring, self-locking of the valve rod in the using process of the valve body is achieved, and due to the fact that the pneumatic telescopic rod is arranged, when the worm is disengaged from the worm gear ring, self-locking of the valve rod is achieved. The position of the main gear ring can be temporarily fixed through the pneumatic telescopic rod, so that the main gear ring is prevented from rotating, and it is guaranteed that the valve rod cannot rotate at the moment when the worm is disengaged from the worm gear ring.

Description

Technical Field

[0001] The utility model relates to the technical field of single-seat regulating valves, in particular to a pneumatic single-seat regulating valve. Background Art

[0002] The single-seat regulating valve is composed of a pneumatic multi-spring diaphragm actuator and a low-resistance straight-through single-seat valve (sleeve valve). The single-seat valve body is a straight-through single-seat cover guide structure, and the valve core is a plunger type structure. Compared with ordinary single-seat valves, it has the characteristics of small size, light weight, and large flow. It is suitable for occasions with large flow and strict leakage requirements.

[0003] For example, a pneumatic single-seat regulating valve in the prior art has a publication number of CN215214803U. The displacement of the valve stem can be observed in real time through the positioning block and the positioning rod in the pneumatic limiter, thereby controlling the opening and closing of the opening and closing port, thereby controlling the flow rate. The pneumatic positioner is connected to the valve stem through a linkage rod. When the valve stem moves, the linkage rod is driven to rotate, thereby making the pneumatic positioner work, and the pneumatic actuator is inflated through the air pipe to keep the pneumatic actuator in a stable state, which is convenient for positioning the new position of the valve stem to adapt to fluids of different pressures, and the accuracy is relatively high.

[0004] However, when the prior art is used and the degree of opening of the valve core needs to be adjusted, it is necessary to first deflate the pneumatic actuator. During the deflation process, the pneumatic actuator loses its position stabilizing effect on the linkage rod, which may cause instantaneous displacement of the valve stem and valve core, affecting the stabilization effect. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art and proposes a pneumatic single-seat regulating valve.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a pneumatic single-seat regulating valve, including a valve body and a valve stem, a valve seat of the valve body is provided with a chamber through which the valve stem passes, a main gear ring in the chamber is fixedly connected to the surface of the valve stem, a main rack meshing with the main gear ring is slidably connected in the chamber, and a pneumatic telescopic rod for driving the main rack to slide is fixedly connected to the cavity wall of the chamber, a worm gear ring is also fixedly connected to the surface of the valve stem, a main slide corresponding to the position of the worm gear ring is slidably connected in the chamber, the main slide slides relative to the worm gear ring, and a secondary slide is slidably connected in the main slide, and a worm for meshing with the worm gear ring is rotatably connected in the secondary slide.

[0007] Preferably, two groups of guide rails are fixedly connected in the chamber from top to bottom, each group of guide rails is provided with two guide rails, and the two groups of guide rails respectively pass through the main rack and the side of the main slide.

[0008] Preferably, an electric telescopic rod is fixedly connected between the outer side wall of the main slide and the cavity wall, and a plurality of spring rods are fixedly connected between the inner side wall of the main slide and the outer side wall of the auxiliary slide.

[0009] Preferably, one end of the worm penetrates through the side wall of the auxiliary slide and extends outwardly and is fixedly connected to a auxiliary gear, and a auxiliary rack meshingly connected to the auxiliary gear is inserted into the outer wall of the auxiliary slide.

[0010] Preferably, an electric push rod whose telescopic end is connected to one end of the auxiliary rack is fixedly connected to the outer wall of the auxiliary slide, and the electric push rod is clearance-matched with the surface of the auxiliary gear and the inner wall of the main slide.

[0011] Preferably, the side edge of the auxiliary slide is sleeved on the main slide, and one side of the opposite outer side of the main slide is fixedly connected with a touch switch for the auxiliary slide to touch.

[0012] Preferably, a handle is inserted at the top end of the valve stem.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are:

[0014] 1. In the utility model, a pneumatic telescopic rod, a main rack and a main gear ring are provided, and the pneumatic telescopic rod is used to extend and retract to realize the movement of the main rack, and then the main gear ring drives the valve stem to rotate, so as to realize the switching of the valve body. A worm and a worm gear ring are provided, and the worm is engaged with the worm gear ring to realize the self-locking of the valve stem during the use of the valve body. Because the pneumatic telescopic rod is provided, when the worm is separated from the worm gear ring, the pneumatic telescopic rod can be used to temporarily fix the position of the main gear ring, thereby preventing the main gear ring from rotating, that is, ensuring that the valve stem will not rotate at the moment when the worm is separated from the worm gear ring.

[0015] 2. In the utility model, by setting a spring rod, a sub-gear and a sub-rack, the sub-rack is used to drive the sub-gear to rotate, so that the worm can be rotated, and then the relative position of the worm and the worm wheel ring can be adjusted. Because the spring rod is set, the elastic force of the spring rod can be used to automatically push the worm to engage the worm wheel ring after the worm rotates until the spiral groove on its surface is aligned with the spiral groove on the side of the worm wheel ring, thereby ensuring that the valve stem can be smoothly locked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structural schematic diagram of a pneumatic single-seat regulating valve is proposed for the utility model;

[0017] Figure 2 The utility model proposes a pneumatic single-seat regulating valve Figure 1 A schematic cross-sectional structure diagram of ;

[0018] Figure 3 The utility model proposes a pneumatic single-seat regulating valve Figure 2 A schematic cross-sectional structure diagram of ;

[0019] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0020] Legend: 1. Valve body; 2. Chamber; 3. Valve stem; 4. Handle; 5. Main gear ring; 6. Main rack; 7. Pneumatic telescopic rod; 8. Worm gear ring; 9. Electric telescopic rod; 10. Main slide; 11. Auxiliary slide; 12. Worm; 13. Auxiliary rack; 14. Electric push rod; 15. Auxiliary gear; 16. Touch switch; 17. Guide rail; 18. Spring rod. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0023] like Figure 1-4As shown, a pneumatic single-seat regulating valve comprises a valve body 1 and a valve stem 3, a handle 4 is inserted at the top of the valve stem 3, the valve body 1 is a single-seat regulating valve of any existing model, a chamber 2 through which the valve stem 3 passes is opened on the valve seat of the valve body 1, a main gear ring 5 in the chamber 2 is fixedly connected to the surface of the valve stem 3, a main rack 6 meshing with the main gear ring 5 is slidably connected in the chamber 2, and a pneumatic telescopic rod 7 for driving the main rack 6 to slide is fixedly connected to the cavity wall of the chamber 2, the main rack 6 is driven to move by the extension and retraction of the pneumatic telescopic rod 7, the main rack 6 is meshed with the main gear ring 5 by the main rack 6, so that the main gear ring 5 rotates with the movement of the main rack 6, thereby driving the valve stem 3 to rotate, so as to realize the switching of the valve body 1, a worm gear ring 8 is also fixedly connected to the surface of the valve stem 3, a main slide seat 10 corresponding to the position of the worm gear ring 8 is slidably connected in the chamber 2, the main slide seat 10 slides relative to the worm gear ring 8, and a sub-slide seat 11 is slidably connected in the main slide seat 10, the main An electric telescopic rod 9 is fixedly connected between the outer wall of the slide 10 and the wall of the chamber 2, and a plurality of spring rods 18 are fixedly connected between the inner wall of the main slide 10 and the outer wall of the auxiliary slide 11. A worm 12 for engaging with the worm gear ring 8 is rotatably connected in the auxiliary slide 11. The electric telescopic rod 9 is extended and retracted to realize the movement of the main slide 10 relative to the worm gear ring 8, and the sliding of the auxiliary slide 11 is realized synchronously, thereby realizing the movement of the worm 12 in the auxiliary slide 11, so that the worm 12 is engaged with or disengaged from the worm gear ring 8. When the worm 12 is engaged with the worm gear ring 8, the worm gear ring 8 can be prevented from rotating, that is, the valve stem 3 is prevented from rotating, that is, the valve stem 3 is locked. When the worm 12 is disengaged from the worm gear ring 8, the valve stem 3 can rotate with the rotation of the main gear ring 5. The spring rod 18 can realize the movable installation of the auxiliary slide 11 and the main slide 10, that is, when the position of the main slide 10 remains unchanged, the auxiliary slide 11 can be moved within the moving range.

[0024] In addition, two sets of guide rails 17 are fixedly connected from top to bottom in the chamber 2, and each set of guide rails 17 is provided with two, and the two sets of guide rails 17 respectively pass through the sides of the main rack 6 and the main slide 10. The provided guide rails 17 ensure that the main rack 6 and the main slide 10 can only slide in one direction, that is, slide relative to the valve stem 3.

[0025] Further discussion: one end of the worm 12 extends through the side wall of the auxiliary slide 11 and extends outward, and is fixedly connected to a secondary gear 15; a secondary rack 13 meshing with the secondary gear 15 is inserted into the outer wall of the auxiliary slide 11; an electric push rod 14 whose telescopic end is connected to one end of the secondary rack 13 is fixedly connected to the outer wall of the auxiliary slide 11; the secondary rack 13 is moved by the telescopic end of the electric push rod 14, and then the secondary gear 15 meshing with the secondary rack 13 drives the worm 12 to rotate; by rotating the worm 12, while the position of the main slide 10 remains unchanged, by rotating the worm 12, the spiral groove on the surface of the worm 12 is aligned with the spiral groove on the side of the worm wheel ring 8, and under the elastic extension and pushing action of the spring rod 18, the worm 12 engages with the worm wheel ring 8, and the electric push rod 14 is used to move the secondary rack 13. The surfaces of the push rod 14 and the auxiliary gear 15 are matched with the clearance of the inner wall of the main slide 10 to prevent the electric push rod 14 and the auxiliary gear 15 from being damaged by friction when the auxiliary slide 11 slides. The side of the auxiliary slide 11 is sleeved on the main slide 10, and the opposite outer sides of the main slide 10 are fixedly connected with a touch switch 16 for the auxiliary slide 11 to touch. The touch switch 16 is electrically connected to the electric push rod 14. When the spiral groove of the worm 12 is aligned with the spiral groove on the side of the worm wheel ring 8, and under the elastic extension and pushing action of the spring rod 18, the worm 12 engages with the worm wheel ring 8, the auxiliary slide 11 moves accordingly to touch the touch switch 16 on the main slide 10, and the touch switch 16 cuts off the power to the electric push rod 14, that is, the worm 12 automatically stops rotating.

[0026] Working principle: the pneumatic telescopic rod 7 is extended and retracted to drive the main rack 6 to move, so that the main gear ring 5 rotates with the movement of the main rack 6, and then drives the valve stem 3 to rotate, so that the valve body 1 is switched. After the valve stem 3 stops rotating, the electric telescopic rod 9 pushes the main slide 10 and the auxiliary slide 11 to move toward the valve stem 3 until the worm 12 in the auxiliary slide 11 is against the side of the worm gear ring 8, and the spring rod 18 is in a compressed state. Then the electric push rod 14 pushes the auxiliary rack 13 to move, so that the auxiliary gear 15 drives the worm 12 to rotate, so that the spiral groove on the surface of the worm 12 is aligned with the spiral groove on the side of the worm gear ring 8, and under the elastic extension push of the spring rod 18, the worm 12 bites the worm gear ring 8, so that the valve stem 3 is locked.

[0027] The wiring diagram of the pneumatic telescopic rod 7, the electric telescopic rod 9, the electric push rod 14 and the touch switch 16 in the utility model belongs to the common knowledge in the field, and its working principle is a well-known technology. The model is selected according to the actual use. Therefore, the control method and wiring arrangement of the pneumatic telescopic rod 7, the electric telescopic rod 9, the electric push rod 14 and the touch switch 16 are no longer explained in detail.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pneumatic single-seat regulating valve, comprising a valve body (1) and a valve stem (3), characterized in that: The valve seat of the valve body (1) is provided with a chamber (2) through which the valve stem (3) passes; a main toothed ring (5) located in the chamber (2) is fixedly connected to the surface of the valve stem (3); a main rack (6) meshing with the main toothed ring (5) is slidably connected in the chamber (2); and a pneumatic telescopic rod (7) for driving the main rack (6) to slide is fixedly connected to the wall of the chamber (2); a worm gear ring (8) is also fixedly connected to the surface of the valve stem (3); a main slide seat (10) corresponding to the position of the worm gear ring (8) is slidably connected in the chamber (2); the main slide seat (10) slides relative to the worm gear ring (8), and a secondary slide seat (11) is slidably connected in the main slide seat (10); a worm (12) for meshing with the worm gear ring (8) is rotatably connected in the secondary slide seat (11).

2. The pneumatic single-seat regulating valve according to claim 1, characterized in that: Two groups of guide rails (17) are fixedly connected from top to bottom in the chamber (2), each group of guide rails (17) is provided with two, and the two groups of guide rails (17) respectively penetrate the side of the main rack (6) and the main slide seat (10).

3. The pneumatic single-seat regulating valve according to claim 1, characterized in that: An electric telescopic rod (9) is fixedly connected between the outer wall of the main slide (10) and the wall of the chamber (2), and a plurality of spring rods (18) are fixedly connected between the inner wall of the main slide (10) and the outer wall of the auxiliary slide (11).

4. The pneumatic single-seat regulating valve according to claim 1, characterized in that: One end of the worm (12) penetrates through the side wall of the auxiliary slide (11) to extend outward and is fixedly connected to a secondary gear (15); the outer wall of the auxiliary slide (11) is plugged with a secondary rack (13) meshingly connected to the secondary gear (15).

5. The pneumatic single-seat regulating valve according to claim 4, characterized in that: The outer wall of the auxiliary slide (11) is fixedly connected with an electric push rod (14) whose telescopic end is connected to one end of the auxiliary rack (13); the electric push rod (14) and the surface of the auxiliary gear (15) are clearance-matched with the inner wall of the main slide (10).

6. The pneumatic single-seat regulating valve according to claim 4, characterized in that: The side edge of the auxiliary slide (11) is sleeved on the main slide (10), and a touch switch (16) for the auxiliary slide (11) to touch is fixedly connected to one side of the opposite outer side of the main slide (10).

7. The pneumatic single-seat regulating valve according to claim 1, characterized in that: A handle (4) is inserted at the top end of the valve stem (3).

Images