Dustproof and moistureproof valve rod structure for gate valve

Abstract

The valve rod structure comprises a fixing frame arranged on the gate valve, a hand wheel is rotationally arranged on the fixing frame, and a valve rod of the gate valve penetrates through the circle center of the fixing frame and is in threaded connection with a screw hole formed in the circle center of the hand wheel. The lower surface of the fixing frame is arranged on a sealing cylinder connected to the outer side of the valve rod in a sleeving mode, the sealing cylinder is connected with the outer side of a valve body of the gate valve, an annular fixing base is fixedly installed on the upper surface of the fixing frame through fixing bolts, and the lower portion of the valve rod is arranged in the sealing cylinder in a sealed mode and is protected in a sealed mode through the sealing cylinder. The upper portion of the valve rod is sleeved with the telescopic pipe, and the telescopic pipe can extend or retract when the top plate moves up and down along with the valve rod, so that the valve rod is always sealed and protected by the telescopic pipe, and dust or moisture and the like are prevented from entering the telescopic pipe and polluting or rusting the valve rod. And the operation flexibility of the valve and the working stability of the whole system are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valve accessories, and particularly relates to a valve stem structure for a gate valve with dust and moisture protection. Background Technique

[0002] A gate valve is a common type of valve, widely used in various fluid control systems, such as water treatment, petrochemical and other fields. For a rising-stem gate valve, the handwheel (or other driving mechanism) is stationary on the valve stem nut. When the handwheel (or other driving mechanism) rotates, the valve stem moves up and down, thereby starting the gate valve, opening and closing the pipeline and controlling the flow rate. The rising-stem gate valve has the advantage of being easy to observe the opening and closing state, but the valve stem thread is exposed, and it is easy to enter dust or other impurities. For gate valves used outdoors or exposed to harsh environments, the valve stem part is also affected by factors such as moisture, which may lead to the valve stem being contaminated or rusted, not only affecting the operation flexibility of the valve, but also seriously may cause the failure or damage of the entire system. For this reason, we propose a valve stem structure for a gate valve with dust and moisture protection. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the existing defects, and provide a valve stem structure for a gate valve with dust and moisture protection. The valve stem is always under the sealed protection of the telescopic tube, avoiding dust or moisture from entering and contaminating or rusting the valve stem, ensuring the operation flexibility of the valve and the working stability of the entire system, and can effectively solve the problems in the background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A valve stem structure for a gate valve with dust and moisture protection, including a fixing frame arranged on the gate valve, the handwheel is rotatably arranged on the fixing frame, the valve stem of the gate valve penetrates through the center of the fixing frame and is threadedly connected to the screw hole opened at the center of the handwheel. The lower surface of the fixing frame is provided with a sealing cylinder sleeved outside the valve stem, and the sealing cylinder is connected to the outside of the valve body of the gate valve. The upper surface of the fixing frame is fixedly installed with an annular fixing base through fixing bolts. The fixing base is coaxially arranged with the valve stem and sleeved outside the valve stem. The top end of the valve stem is fixedly provided with a top plate. A telescopic tube is arranged between the top plate and the fixing base. The telescopic tube is sleeved outside the valve stem. And an air inlet and outlet is opened on the upper surface of the top plate, and a moisture-proof filter tube is installed on the air inlet and outlet. A moisture-absorbing material layer is arranged inside the moisture-proof filter tube.

[0005] As a preferred technical solution of the utility model, an annular sealing gasket is arranged between the fixing base and the fixing frame.

[0006] As a preferred technical solution of the utility model, at least one annular groove is opened on the lower surface of the fixing base, and at least one annular protrusion corresponding to the groove is arranged on the upper surface of the sealing gasket.

[0007] As a preferred technical solution of the present utility model, two filter meshes are arranged on the inner surface of the moisture-proof filter tube, and the two filter meshes are respectively arranged on the upper and lower sides of the moisture-absorbing material layer.

[0008] As a preferred technical solution of the present utility model, a plurality of auxiliary springs are evenly arranged between the top plate and the fixed base, and the auxiliary springs are evenly arranged in a circular array on the outer peripheral side of the valve stem.

[0009] As a preferred technical solution of the present utility model, a plurality of multi-stage telescopic rods corresponding to the auxiliary springs are evenly arranged between the top plate and the fixed base, and the multi-stage telescopic rods are arranged inside the corresponding auxiliary springs.

[0010] As a preferred technical solution of the present utility model, the moisture-proof filter tube is a transparent tube, and the moisture-absorbing material layer is a discoloring silica gel layer.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: The lower part of the valve stem is hermetically arranged in the sealing cylinder, which seals and protects the lower part of the valve stem, preventing dust and impurities from entering and isolating the influence of moisture. The upper part of the valve stem is sleeved in the telescopic tube. When the top plate moves up and down with the valve stem, the telescopic tube can extend or shorten, so that the valve stem is always under the sealing protection of the telescopic tube, preventing dust or moisture from entering and contaminating or corroding the valve stem, ensuring the operation flexibility of the valve and the working stability of the whole system. Since the internal space of the telescopic tube changes when it extends or shortens, and the internal and external air pressures are inconsistent, the external air will squeeze the telescopic tube and cause it to deform, affecting its sealing protection of the valve stem. Therefore, an air inlet and outlet is provided to allow air to enter when the telescopic tube extends and to discharge air when the telescopic tube compresses, ensuring consistent internal and external air pressures and preventing it from deforming, further improving the use stability. A detachable moisture-proof filter tube is arranged on the air inlet and outlet. The moisture-absorbing material layer inside it can adsorb moisture in the air, thus preventing the valve stem from being corroded. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is a schematic side view structural diagram of the present utility model;

[0014] Figure 3 is a schematic structural diagram of the moisture-proof filter tube of the present utility model;

[0015] Figure 4 is a schematic structural diagram of the multi-stage telescopic rod of the present utility model.

[0016] In the figure: 1 fixing bracket, 2 handwheel, 3 sealing cylinder, 4 fixed base, 5 fixing bolt, 6 sealing gasket, 7 protrusion, 8 telescopic tube, 9 top plate, 10 valve stem, 11 air inlet and outlet, 12 moisture-proof filter tube, 13 filter screen, 14 auxiliary spring, 15 multi-section telescopic rod, 16 moisture-absorbing material layer. Detailed implementation manner

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-4 , the present invention provides a technical solution: a valve stem structure for a dust-proof and moisture-proof gate valve, including a fixing bracket 1 provided on the gate valve, a handwheel 2 is rotatably provided on the fixing bracket 1, the valve stem 10 of the gate valve penetrates through the center of the fixing bracket 1 and is threadedly connected to a threaded hole opened at the center of the handwheel 2. The lower surface of the fixing bracket 1 is provided with a sealing cylinder 3 sleeved outside the valve stem 10. The sealing cylinder 3 is connected to the outside of the valve body of the gate valve. The lower part of the valve stem 10 is hermetically arranged in the sealing cylinder 3, which seals and protects the lower part of the valve stem 10 to prevent dust and impurities from entering and isolate the influence of moisture.

[0019] The upper surface of the fixing bracket 1 is fixedly installed with an annular fixed base 4 through a fixing bolt 5. The fixed base 4 is coaxially arranged with the valve stem 10 and sleeved outside the valve stem 10. The top of the valve stem 10 is fixedly provided with a top plate 9. A telescopic tube 8 is arranged between the top plate 9 and the fixed base 4. The telescopic tube 8 is sleeved outside the valve stem 10, and the upper part of the valve stem 10 is sleeved in the telescopic tube 8. The telescopic tube 8 can be extended or shortened when the top plate 9 moves up and down with the valve stem 10, so that the valve stem 10 is always under the sealing protection of the telescopic tube 8, preventing dust or moisture from entering and contaminating or rusting the valve stem, ensuring the operation flexibility of the valve and the working stability of the entire system.

[0020] Since the internal space of the telescopic tube 8 changes when it is extended or shortened, and the internal and external air pressures are inconsistent, the external air will squeeze the telescopic tube 8 and cause the telescopic tube 8 to deform, affecting its sealing protection of the valve stem. Therefore, an air inlet and outlet 11 is provided to allow air to enter when the telescopic tube 8 is extended and discharge air when the telescopic tube 8 is compressed, ensuring that the internal and external air pressures are consistent and preventing it from deforming, further improving the use stability.

[0021] A moisture-proof filter tube 12 is installed on the air inlet and outlet 11. A moisture-absorbing material layer 16 is arranged inside the moisture-proof filter tube 12. A detachable moisture-proof filter tube 12 is arranged on the air inlet and outlet 11. The moisture in the air can be adsorbed through the moisture-absorbing material layer 16 arranged therein, thereby preventing the valve stem from being rusted.

[0022] In a preferred technical solution, an annular sealing gasket 6 is arranged between the fixed base 4 and the fixed frame 1 for sealing the connection between the fixed base 4 and the fixed frame 1 to improve the moisture-proof and dust-proof effects. At least one annular groove is formed on the lower surface of the fixed base 4, and at least one annular protrusion 7 corresponding to the groove is arranged on the upper surface of the sealing gasket 6. The protrusion 7 is clamped into the groove, which can further improve the sealing performance of the sealing gasket 6.

[0023] The valve stem 10 and the top plate 9 can be fixedly connected, and the valve stem 10 does not penetrate through its top; or it can penetrate through the upper surface of the top plate 9 and be fixed by bolts, etc., for the convenience of maintenance and repair, etc. When adopting this method, a corresponding sealing structure, such as a sealing ring, etc., is also arranged at the connection between the top plate 9 and the valve stem 10.

[0024] In a preferred technical solution, two filter meshes 13 are arranged on the inner side surface of the moisture-proof filter tube 12. The two filter meshes 13 are respectively arranged on the upper and lower sides of the moisture-absorbing material layer 16 for fixing the moisture-absorbing material layer 16. After working for a period of time, the moisture-absorbing material layer 16 will fail due to adsorbing more moisture. Therefore, the moisture-proof filter tube 12 is set to be replaceable so as to quickly replace the new moisture-proof filter tube 12 after the moisture-absorbing material layer 16 fails.

[0025] In a further preferred technical solution, the moisture-proof filter tube 12 is a transparent tube, and the moisture-absorbing material layer 16 is a discoloring silica gel layer. The discoloring silica gel has the characteristic that its own color changes from blue to red after absorbing moisture. The staff can observe the color of the moisture-absorbing material layer 16 through the transparent moisture-proof filter tube 12 every time the gate valve is operated to judge whether it needs to be replaced.

[0026] The moisture-absorbing material layer 16 can also be selected from cobalt-free orange silica gel desiccant or cobalt-free blue silica gel desiccant in discoloring silica gel, or anhydrous copper sulfate that will turn into blue copper sulfate pentahydrate after absorbing moisture.

[0027] In an optional technical solution, a plurality of auxiliary springs 14 are evenly arranged between the top plate 9 and the fixed base 4. The auxiliary springs 14 are evenly arranged in a circular array on the outer peripheral side of the valve stem 10. The auxiliary springs 14 are used to assist the telescopic tube 8 to extend or shorten and reset, further improving the use stability.

[0028] Further optionally, a plurality of multi-stage telescopic rods 15 corresponding to the auxiliary springs 14 are evenly arranged between the top plate 9 and the fixed base 4. The multi-stage telescopic rods 15 are arranged inside the corresponding auxiliary springs 14 to prevent the springs 14 from bending, tilting or other deformations, so as to avoid interference between the telescopic tube 8 and the auxiliary springs 14 when the telescopic tube 8 contracts. The multi-stage telescopic rod 15 at least includes three telescopic rods sleeved in sequence. When it extends, its length is the distance between the top plate 9 and the upper surface of the fixed frame 1 when the gate valve is opened, and when it is retracted to the shortest, its length is the distance between the top plate 9 and the upper surface of the fixed frame 1 when the gate valve is closed.

[0029] The parts not disclosed in the present invention are all prior arts, and their specific structures, materials and working principles will not be elaborated in detail. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve stem structure for a globe valve with dust and moisture protection, comprising a fixing frame (1) arranged on the globe valve, a handwheel (2) is rotatably arranged on the fixing frame (1), the valve stem (10) of the globe valve penetrates through the center of the fixing frame (1) and is threadedly connected to a threaded hole opened at the center of the handwheel (2), and it is characterized in that: The lower surface of the fixing frame (1) is provided with a sealing cylinder (3) sleeved outside the valve stem (10). The sealing cylinder (3) is connected to the outside of the valve body of the gate valve. The upper surface of the fixing frame (1) is fixedly installed with an annular fixing base (4) through fixing bolts (5). The fixing base (4) is coaxially arranged with the valve stem (10) and sleeved outside the valve stem (10). The top end of the valve stem (10) is fixedly provided with a top plate (9). A telescopic tube (8) is arranged between the top plate (9) and the fixing base (4). The telescopic tube (8) is sleeved outside the valve stem (10). And an air inlet / outlet (11) is opened on the upper surface of the top plate (9). A moisture-proof filter tube (12) is installed on the air inlet / outlet (11). A moisture-absorbing material layer (16) is arranged inside the moisture-proof filter tube (12).

2. The valve stem structure for a dust-proof and moisture-proof gate valve according to claim 1, characterized in that: An annular sealing gasket (6) is arranged between the fixing base (4) and the fixing frame (1).

3. The valve stem structure for a dust-proof and moisture-proof gate valve according to claim 2, wherein: At least one annular groove is opened on the lower surface of the fixing base (4). At least one annular protrusion (7) corresponding to the groove is arranged on the upper surface of the sealing gasket (6).

4. A valve stem structure for a dust-proof and moisture-proof gate valve according to claim 1, characterized in that: Two filter meshes (13) are arranged on the inner side surface of the moisture-proof filter tube (12). The two filter meshes (13) are respectively arranged on the upper and lower sides of the moisture-absorbing material layer (16).

5. A valve stem structure for a dust-proof and moisture-proof gate valve according to claim 1, characterized in that: A plurality of auxiliary springs (14) are evenly arranged between the top plate (9) and the fixing base (4). The auxiliary springs (14) are evenly arranged in a circular array on the outer peripheral side of the valve stem (10).

6. The valve stem structure for a dust-proof and moisture-proof gate valve according to claim 5, characterized in that: A plurality of multi-stage telescopic rods (15) corresponding to the auxiliary springs (14) are evenly arranged between the top plate (9) and the fixing base (4). The multi-stage telescopic rods (15) are arranged inside the corresponding auxiliary springs (14).

7. A valve stem structure for a dust-proof and moisture-proof gate valve according to any one of claims 1-6, characterized in that: The moisture-proof filter tube (12) is a transparent tube. The moisture-absorbing material layer (16) is a color-changing silica gel layer.

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