Anti-rotation structure for valve rod of stop valve

Abstract

The utility model relates to a stop valve rod anti-rotation structure which comprises a valve rod, one end of an anti-rotation block is fixedly connected with a valve cover guide rib through a sliding bearing, a plurality of pin shafts are arranged on the two sides of the anti-rotation block in the length direction in a penetrating mode, the valve rod and the anti-rotation block are arranged in a penetrating mode, and the valve rod is perpendicular to the pin shafts. The top end of the valve rod is fixedly connected with a gear, the bottom end of the valve rod is fixedly connected with a gate plate, the gear drives the valve rod to rotate, the valve rod drives the gate plate to move up and down, and the anti-rotation block prevents the valve rod from rotating. The stop valve rod anti-rotation structure has the advantages of reducing friction force, improving smoothness, being convenient to install and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a stop valve stem anti-rotation structure. Background Art

[0002] At present, the stop valve is a valve whose closing part (valve disc) moves along the center line of the valve seat, and is mainly used for regulation and cutting in the pipeline. It has a simple structure and is easy to manufacture and maintain; the sealing surface is not easy to wear and scratch, and there is no relative sliding between the valve disc and the sealing surface of the valve body during opening and closing, so the wear and scratch are not serious, the sealing performance is good, and the service life is long, so it is widely used. The stem of the stop valve usually rotates and rises and falls during the opening and closing process, but when the valve is operated by a gear box, since the gear box stem nut is fixed, the stem can only rise and fall, so the friction resistance between the stem and the valve cover will increase.

[0003] For this reason, we have developed a stop valve stem anti-rotation structure to solve the above problems. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and to provide a stop valve stem anti-rotation structure, which has the advantages of reducing friction, improving finish, facilitating installation, and the like.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a stop valve stem anti-rotation structure, including a valve stem and an anti-rotation block, one end of the anti-rotation block is fixedly connected to a valve cover guide rib through a sliding bearing, a plurality of pins are penetrated on both sides of the length direction of the anti-rotation block, the valve stem is penetrated by the anti-rotation block and is arranged perpendicular to the pins, the top end of the valve stem is fixedly connected to a gear, and the bottom end is fixedly connected to a gate plate, the gear drives the valve stem to rotate, the valve stem drives the gate plate to move up and down, and the anti-rotation block prevents the valve stem from rotating.

[0006] Preferably, a groove is provided at one end of the anti-rotation block, and the groove is pressed against the sliding bearing.

[0007] Preferably, an alloy layer is provided on the outer wall of one end of the valve cover guide rib, and the alloy layer is pressed against the inner wall of the sliding bearing.

[0008] Preferably, a plurality of first through holes are provided on both sides of the anti-rotation block in the length direction, and the first through holes are plugged with the pin shafts.

[0009] Preferably, a second through hole is provided at a middle position of the top end of the anti-rotation block, and the second through hole is plugged into the valve stem.

[0010] Preferably, an external thread is provided at the top end of the valve stem, and an internal thread is provided at the center position of the gear, and the external thread is meshed with the internal thread.

[0011] Preferably, the gear is provided with external teeth evenly distributed around the circumference, and the external teeth are meshed with the adjustment handle.

[0012] Preferably, a screw hole is provided at the top end of the valve stem, and the screw hole is fixedly connected to an opening and closing indicating rod.

[0013] Preferably, a packing seal is provided at a middle position of the valve stem, and the packing seal is crimped by a gland.

[0014] Preferably, the gate seal abuts against a valve body sealing ring, and the valve body sealing ring is fixedly connected to the valve body chamber.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] The valve stem anti-rotation structure of the stop valve described in the utility model reduces the friction force generated by the anti-rotation block; a wear-resistant sliding bearing is added on the basis of the anti-rotation structure, and Stellite alloy is built-up on the valve cover guide rib to increase wear resistance and improve the smoothness of the two friction surfaces during processing; the anti-rotation structure is simplified to facilitate installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the stem anti-rotation structure of the stop valve of the utility model.

[0018] Figure 2 For this utility model Figure 1 Cross-sectional view at AA in the middle. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 and Figure 2 In the invention, a valve stem anti-rotation structure of a stop valve includes a valve stem 2 and an anti-rotation block 1. One end of the anti-rotation block 1 is fixedly connected to a valve cover guide rib 5 through a sliding bearing 4. A plurality of pins 3 are provided on both sides of the anti-rotation block 1 in the length direction. The valve stem 2 is provided with the anti-rotation block 1 and is vertically arranged with the pins 3. The top of the valve stem 2 is fixedly connected to a gear 6, and the bottom of the valve stem 2 is fixedly connected to a gate plate 7. The gear 6 drives the valve stem 2 to rotate, and the valve stem 2 drives the gate plate 7 to move up and down. The anti-rotation block 1 prevents the valve stem 2 from rotating. An alloy layer 51 is provided on the outer wall of one end of the valve cover guide rib 5, and the alloy layer 51 is pressed against the inner wall of the sliding bearing 4. The alloy layer 51 is a surfacing Stellite alloy layer, which improves wear resistance and increases smoothness.

[0021] The anti-rotation block 1 is arranged at the middle position between the external thread 201 and the pressure cover 81. A groove 13 is arranged at one end of the anti-rotation block 1, and the groove 13 is pressed with the sliding bearing 4. The sliding bearing 4 is arranged perpendicular to the valve stem 2. A plurality of first through holes 11 are arranged on both sides of the length direction of the anti-rotation block 1, preferably 2, which are arranged on both sides of the valve stem 2 respectively. A second through hole 12 is arranged at the middle position of the top of the anti-rotation block 1. The first through hole 11 is plugged with the pin 3. The second through hole 12 is plugged with the valve stem 2.

[0022] A screw hole 202 is provided at the center of the top of the valve stem 2, an external thread 201 is provided at the top of the valve stem 2, a packing seal 8 is penetrated at the middle position of the valve stem 2, and a gate 7 is provided at the bottom. The gate 7 is sealed against the valve body sealing ring 71, and the valve body sealing ring 71 is fixedly connected to the valve body chamber. An internal thread 601 is provided at the center of the gear 6, and the external thread 201 is meshed with the internal thread 601. The gear 6 is provided with external teeth 602 evenly distributed around the circumference, and the external teeth 602 are meshed with the adjustment handle 61. The packing seal 8 is crimped by the gland 81. The screw hole 202 is fixedly connected to an opening and closing indicator rod 9. The opening and closing indicator rod 9 is provided with markings "C" for closing and "O" for opening.

[0023] First, install the sliding bearing 4 into the groove 13 of the anti-rotation block 1; then insert the second through hole 12 of the anti-rotation block 1 into the valve stem 2, drill through the first through hole 11 of the pin, insert the pin 3 and weld it; open and close the valve 3 times to check if there is any jamming at the anti-rotation block. Therefore, an anti-rotation structure is designed at the valve stem and the valve cover, which will cause friction resistance between the valve stem anti-rotation block and the valve cover, making the valve torque larger.

[0024] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A stop valve stem anti-rotation structure, characterized in that: The invention comprises a valve stem (2) and an anti-rotation block (1), one end of the anti-rotation block (1) is fixedly connected to a valve cover guide rib (5) via a sliding bearing (4), a plurality of pins (3) are penetrated on both sides of the anti-rotation block (1) in the length direction, the valve stem (2) penetrates the anti-rotation block (1) and is vertically arranged with the pins (3), the top end of the valve stem (2) is fixedly connected to a gear (6), and the bottom end is fixedly connected to a gate plate (7), the gear (6) drives the valve stem (2) to rotate, the valve stem (2) drives the gate plate (7) to move up and down, and the anti-rotation block (1) prevents the valve stem (2) from rotating.

2. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: A groove (13) is provided at one end of the anti-rotation block (1), and the groove (13) is pressed against the sliding bearing (4).

3. The stem anti-rotation structure of the stop valve according to claim 2, characterized in that: An alloy layer (51) is provided on the outer wall of one end of the valve cover guide rib (5), and the alloy layer (51) is pressed against the inner wall of the sliding bearing (4).

4. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: A plurality of first through holes (11) are provided on both sides of the anti-rotation block (1) in the length direction, and the first through holes (11) are plugged into the pin shafts (3).

5. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: A second through hole (12) is provided at the middle position of the top end of the anti-rotation block (1), and the second through hole (12) is plugged into the valve stem (2).

6. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: An external thread (201) is provided at the top end of the valve stem (2), and an internal thread (601) is provided at the center of the gear (6), and the external thread (201) is meshed with the internal thread (601).

7. The stem anti-rotation structure of the stop valve according to claim 6, characterized in that: The gear (6) is provided with external teeth (602) evenly distributed around the circumference, and the external teeth (602) are meshed with the adjustment handle (61).

8. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: A screw hole (202) is provided at the top end of the valve stem (2), and the screw hole (202) is fixedly connected to an opening and closing indicating rod (9).

9. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: A packing seal (8) is provided at the middle position of the valve stem (2), and the packing seal (8) is crimped by a gland (81).

10. The stem anti-rotation structure of the stop valve according to claim 1, characterized in that: The gate plate (7) is sealingly abutted against a valve body sealing ring (71), and the valve body sealing ring (71) is fixedly connected to the valve body chamber.

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