Double-seal valve

Abstract

The double-seal valve comprises a valve body and a valve rod, the valve body is provided with a first pipe opening and a second pipe opening which are communicated with each other, and a positioning pipe is fixed in the first pipe opening; a sealing box is connected into the valve body, the valve rod is rotationally connected with the sealing box, a first screw is connected into the valve rod in a threaded mode, the lower end of the first screw is connected with a first sealing plug, a sliding groove is formed in the inner wall of the valve body, a sliding rod is connected to the first screw, and the sliding rod is slidably connected into the sliding groove. The upper portion in the second pipe opening is connected with a second screw rod, the lower portion in the second pipe opening is connected with a guide rod, the second screw rod is in threaded connection with a transmission block, the guide rod is in sliding connection with a sliding block, a mounting plate is connected between the transmission block and the sliding block, the mounting plate is connected with a second sealing plug, the end of the second screw rod is connected with a first bevel gear, and the valve rod is connected with a second bevel gear. And the first bevel gear is meshed with the second bevel gear. The valve can seal the first pipe orifice and the second pipe orifice at the same time, double sealing is achieved, and leakage is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and specifically relates to a double-sealing valve. Background Art

[0002] A valve is a mechanical device for controlling the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. A valve is a basic component in a pipeline system. A valve sealing pair consists of a valve seat and a closing member, and relies on two precisely machined sealing surfaces on the valve seat and the closing member to be in close contact or the sealing surfaces to be plastically deformed under pressure to achieve sealing. It is the main part to ensure the reliable operation of the valve. Most current valves only have one sealing plug. When the sealing plug seals the valve, there is still a certain leakage amount on its sealing surface, and the sealing performance is average. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a double-sealing valve to solve the problems mentioned in the above background art.

[0004] To solve the above technical problems, the utility model provides the following technical solutions:

[0005] A double-sealing valve includes a valve body, a valve cover is connected to the valve body, a valve rod is rotatably connected to the valve cover through a rotary bearing, a runner is connected to the upper end of the valve rod, a first pipe orifice is provided at the bottom of the valve body, a second pipe orifice communicating with the first pipe orifice is provided on one side of the valve body, and a positioning pipe is fixed in the first pipe orifice; a sealing box is connected in the valve body, the valve rod is rotatably connected to the sealing box, a screw hole extending upward is provided at the bottom of the valve rod, a first screw is threadedly connected in the screw hole, a first sealing plug is connected to the lower end of the first screw, the first sealing plug is located above the positioning pipe, a vertical sliding groove is provided on the inner wall of the valve body, a sliding rod is connected to the first screw near the first sealing plug, and the sliding rod is slidably connected in the sliding groove; the upper part in the second pipe orifice is connected with a second screw, the lower part is connected with a guide rod, a transmission block is threadedly connected to the second screw, a slider is slidably connected to the guide rod, a mounting plate is connected between the transmission block and the slider, a second sealing plug is connected to one side of the mounting plate facing the second pipe orifice, the second sealing plug is aligned with the second pipe orifice, the second screw is rotatably connected to the sealing box, and a first bevel gear is connected to the end of the second screw located in the sealing box, a second bevel gear is connected to the valve rod, and the first bevel gear meshes with the second bevel gear.

[0006] Preferably, the inner wall of the upper end of the positioning pipe is trapezoidal, and a first sealing ring is fixed to the inner wall; the lower part of the first sealing plug is also trapezoidal and matches the positioning pipe.

[0007] Preferably, a second sealing ring is provided on the outer wall of the second sealing plug.

[0008] Preferably, a third sealing ring is provided at the connection between the valve rod and the sealing box.

[0009] Preferably, a fourth sealing ring is provided at the connection between the second screw rod and the sealing box.

[0010] Preferably, a limiting block is connected to one end of the guide rod away from the second pipe orifice.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] Rotate the runner to drive the valve stem to rotate. During the rotation of the valve stem, the first screw rod moves downward, so that the first sealing plug seals the positioning pipe. During the rotation of the valve stem, the second screw rod is driven to rotate through the cooperation of the second bevel gear and the first bevel gear, so as to drive the second sealing plug to seal the second pipe orifice, thereby simultaneously completing the sealing of the first pipe orifice and the second pipe orifice, realizing double sealing, and thus preventing leakage. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the present utility model;

[0014] Figure 2 is a sectional view of the present utility model;

[0015] In the figure: 1 - valve body, 2 - valve cover, 3 - valve stem, 4 - runner, 5 - first pipe orifice, 6 - second pipe orifice, 7 - positioning pipe, 8 - sealing box, 9 - screw hole, 10 - first screw rod, 11 - first sealing plug, 12 - chute, 13 - sliding rod, 14 - second screw rod, 15 - guide rod, 16 - transmission block, 17 - slider, 18 - mounting plate, 19 - second sealing plug, 20 - first bevel gear, 21 - second bevel gear, 22 - first sealing ring, 23 - second sealing ring, 24 - third sealing ring, 25 - fourth sealing ring, 26 - limiting block. Detailed Embodiments

[0016] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] Embodiment 1

[0018] Please refer to Figure 1 and Figure 2, A double-sealed valve, comprising a valve body 1, a valve cover 2 is connected to the valve body 1, a valve rod 3 is rotatably connected to the valve cover 2 through a rotary bearing, a runner 4 is connected to the upper end of the valve rod 3, a first pipe orifice 5 is provided at the bottom of the valve body 1, a second pipe orifice 6 communicating with the first pipe orifice is provided on one side of the valve body 1, and a positioning pipe 7 is fixed in the first pipe orifice 5; a sealing box 8 is connected inside the valve body 1, the valve rod 3 is rotatably connected to the sealing box 8, a threaded hole 9 extending upward is provided at the bottom of the valve rod 3, a first screw rod 10 is threadedly connected in the threaded hole 9, a first sealing plug 11 is connected to the lower end of the first screw rod 10, the first sealing plug 11 is located above the positioning pipe 7, a vertical sliding groove 12 is provided on the inner wall of the valve body 1, a sliding rod 13 is connected to the first screw rod 10 near the first sealing plug, and the sliding rod 13 is slidably connected in the sliding groove 12; the upper part inside the second pipe orifice 6 is connected with a second screw rod 14, the lower part is connected with a guide rod 15, a transmission block 16 is threadedly connected to the second screw rod 14, a slider 17 is slidably connected to the guide rod 15, a mounting plate 18 is connected between the transmission block 16 and the slider 17, a second sealing plug 19 is connected to one side of the mounting plate 18 facing the second pipe orifice, the second sealing plug 19 is aligned with the second pipe orifice 6, the second screw rod 14 is rotatably connected to the sealing box 8, and a first bevel gear 20 is connected to the end of the second screw rod 14 located inside the sealing box, and a second bevel gear 21 is connected to the valve rod 3, and the first bevel gear 20 meshes with the second bevel gear 21.

[0019] During use, rotate the runner 4 to drive the valve rod 3 to rotate. Since the first screw rod 10 is threadedly connected inside the valve rod 3 and one side of the first screw rod 10 is slidably connected in the sliding groove 12 through the sliding rod 13, the valve rod 3 drives the first screw rod 10 to move downward during rotation until the first sealing plug seals the positioning pipe. At this time, the upper part of the first screw rod 10 is still threadedly connected in the threaded hole 9; during the rotation of the valve rod 3, the second screw rod 14 is driven to rotate through the cooperation of the second bevel gear 21 and the first bevel gear 20, thereby driving the second sealing plug 19 to seal the second pipe orifice 6, so as to simultaneously complete the sealing of the first pipe orifice 5 and the second pipe orifice 6, achieving double sealing and preventing leakage.

[0020] The inner wall of the upper end of the positioning pipe 7 is trapezoidal, and a first sealing ring 22 is fixed on the inner wall; the lower part of the first sealing plug 11 is also trapezoidal and matches the positioning pipe 7. After the first sealing plug seals the positioning pipe, the sealing performance of the positioning pipe can be improved through the action of the first sealing ring.

[0021] A second sealing ring 23 is provided on the outer wall of the second sealing plug 19. After the second sealing plug seals the second pipe orifice, the sealing performance of the second pipe orifice can be improved through the action of the second sealing ring.

[0022] A third sealing ring 24 is provided at the connection between the valve stem 3 and the sealing box 8. Through the action of the third sealing ring, the sealing performance at the connection between the valve stem and the sealing box can be improved, preventing liquid from entering the sealing box.

[0023] A fourth sealing ring 25 is provided at the connection between the second screw rod 14 and the sealing box 8. Through the action of the fourth sealing ring, the sealing performance at the connection between the second screw rod and the sealing box can be improved, preventing liquid from entering the sealing box.

[0024] Embodiment 2

[0025] The difference between this embodiment and Embodiment 1 is that a limiting block 26 is connected to the end of the guide rod far from the second pipe orifice. By connecting the limiting block 26 to the guide rod, it is possible to prevent the slider from falling off the guide rod during the movement.

[0026] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood 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 double seal valve, characterized in that: The valve body (1) comprises a valve cover (2) connected to the valve body (1), a valve stem (3) rotatably connected to the valve cover (2) via a rotary bearing, the upper end of the valve stem (3) being connected to a rotating wheel (4), a first pipe opening (5) being provided at the bottom of the valve body (1), a second pipe opening (6) being connected to the first pipe opening being provided on one side of the valve body (1), a positioning tube (7) being fixed in the first pipe opening (5); a sealing box (8) being connected in the valve body (1), the valve stem (3) being rotatably connected to the sealing box (8), a screw hole (9) extending upwardly being provided at the bottom of the valve stem (3), a first screw rod (10) being threadedly connected in the screw hole (9), a first sealing plug (11) being connected at the lower end of the first screw rod (10), the first sealing plug (11) being located above the positioning tube (7), a vertical sliding groove (12) being provided on the inner wall of the valve body (1), a second pipe opening (6) being connected to the first pipe opening being provided on one side of the valve body (1), a positioning tube (7) being fixed in the first pipe opening (5); a sealing box (8) being connected in the valve body (1), the valve stem (3) being rotatably connected to the sealing box (8), a screw hole (9) extending upwardly being provided at the bottom of the valve stem (3), a first screw rod (10) being threadedly connected in the screw hole (9), a first sealing plug (11) being located above the positioning tube (7), a vertical sliding groove (12) being provided on the inner wall of the valve body (1), a second screw rod (10) being provided near the first sealing plug The plug is connected with a slide rod (13), and the slide rod (13) is slidably connected to the slide groove (12); the upper part of the second pipe mouth (6) is connected with a second screw rod (14), and the lower part is connected with a guide rod (15); the second screw rod (14) is threadedly connected with a transmission block (16), and the guide rod (15) is slidably connected with a slider (17); a mounting plate (18) is connected between the transmission block (16) and the slider (17); a second sealing plug (19) is connected to the side of the mounting plate (18) facing the second pipe mouth, and the second sealing plug (19) is aligned with the second pipe mouth (6); the second screw rod (14) is rotatably connected to the sealing box (8), and the end of the second screw rod (14) located in the sealing box is connected with a first bevel gear (20); the valve stem (3) is connected with a second bevel gear (21), and the first bevel gear (20) is meshed with the second bevel gear (21).

2. A double sealing valve according to claim 1, characterized in that: The inner wall of the upper end of the positioning tube (7) is trapezoidal, and a first sealing ring (22) is fixed to the inner wall; the lower part of the first sealing plug (11) is also trapezoidal and matches the positioning tube (7).

3. A double sealing valve according to claim 2, characterized in that: A second sealing ring (23) is provided on the outer wall of the second sealing plug (19).

4. A double sealing valve according to claim 3, characterized in that: A third sealing ring (24) is provided at the connection between the valve stem (3) and the sealing box (8).

5. A double sealing valve according to claim 4, characterized in that: A fourth sealing ring (25) is provided at the connection between the second screw (14) and the sealing box (8).

6. A double sealing valve according to any one of claims 1 to 5, characterized in that: One end of the guide rod (15) away from the second pipe opening is connected to a limiting block (26).

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