Leakage-proof structure of double-seal stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a leak-proof structure of a dual-seal stop valve, which comprises a valve body, a fluid channel is arranged in the valve body, and a first knife switch and a second knife switch are respectively arranged in the valve body and used for cutting off two different positions of the fluid channel. A movable groove for the two knife switches to move up and down is formed in the valve body, a mounting groove is formed in the position, located above the fluid channel, in the valve body, and a first adjusting lead screw and a second adjusting lead screw are rotationally mounted at the top of the mounting groove. By means of the first knife switch and the second knife switch which are arranged in the valve body, two different positions of a fluid channel can be cut off, and the double-sealing effect is achieved. By means of the design, the sealing performance of the stop valve is greatly improved, even if one knife switch leaks, the other knife switch can still provide effective sealing, and therefore it is ensured that a fluid channel is safely cut off, and leakage accidents are prevented.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically to the anti-leakage structure of a double-sealed gate valve. Background Technology

[0002] In industrial production, chemical processing, water treatment, and many other fields, gate valves are critical components of fluid control, and their performance and reliability are paramount. Traditional gate valves typically rely on a single gate or seal to cut off the fluid flow. However, under certain extreme operating conditions or during long-term use, this design may experience a decline in sealing performance due to gate wear, corrosion, or seal aging, leading to fluid leakage. Fluid leakage not only wastes resources but can also pose a serious threat to the production environment, equipment, and even personnel safety. The consequences of leakage are particularly dire when handling toxic, harmful, or flammable and explosive fluids.

[0003] To address this issue, the industry has been exploring more reliable and efficient sealing technologies for gate valves. While some improved designs have been implemented, such as using more wear-resistant and corrosion-resistant materials for the gate and seals, or optimizing the fit between the gate and the sealing seat, these measures often only improve sealing performance to a certain extent and cannot fundamentally solve the problem of single-point failure. Therefore, we propose a leak-proof structure for a double-seal gate valve. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a leak-proof structure for a double-sealed shut-off valve.

[0005] The technical solution of this utility model is:

[0006] The anti-leakage structure of the double-sealed shut-off valve includes a valve body with a fluid channel inside. A first gate and a second gate are respectively installed inside the valve body to cut off the fluid channel at two different positions. A movable groove is provided inside the valve body for the two gates to move up and down. An installation groove is provided inside the valve body above the fluid channel. A first adjusting screw and a second adjusting screw are rotatably installed on the top of the installation groove. The first adjusting screw is threadedly connected to the first gate, and the second adjusting screw is threadedly connected to the second gate. A drive mechanism is installed above the valve body to drive the first and second adjusting screws to rotate respectively.

[0007] As a preferred technical solution, a first driven gear and a second driven gear are coaxially fixed on the outer circumference of the first adjusting screw and the outer circumference of the second adjusting screw, respectively.

[0008] As a preferred technical solution, the driving mechanism includes a valve disc, a driving shaft is coaxially fixed at the bottom of the valve disc, the bottom of the driving shaft extends into the mounting groove, and a driving gear is coaxially fixed at the bottom end of the driving shaft.

[0009] As a preferred technical solution, a fixing ring is rotatably mounted on the outer circumference of the drive shaft via a bearing. The fixing ring is located above the valve body, and a return spring is fixedly installed between the bottom of the fixing ring and the top of the valve body.

[0010] As a preferred technical solution, the drive gear does not mesh with the two driven gears simultaneously, and when the valve disc is not subjected to external force, the drive gear is located between the two driven gears in the vertical direction.

[0011] As a preferred technical solution, when the valve disc moves downward to its lowest position, the drive gear meshes with the second driven gear, and at this time the return spring is compressed to its shortest length. When the valve disc moves upward to its highest position, the drive gear meshes with the first driven gear.

[0012] As a preferred technical solution, two pads are symmetrically fixedly connected to the top of the mounting groove. When the switch contacts the top and the pads, the switch moves upward and disengages from the movable groove.

[0013] As a preferred technical solution, both the first and second knife gates are provided with sealing gaskets on their outer walls, and the knife gates are tightly fitted with the movable groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention utilizes a first and a second gate installed within the valve body to cut off the fluid passage at two different locations, achieving a double-sealing effect. This design significantly improves the sealing performance of the gate valve; even if one gate leaks, the other gate can still provide an effective seal, thereby ensuring the safe cutoff of the fluid passage and preventing leakage accidents. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the valve body in this utility model;

[0018] Figure 3 In this utility model Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 In this utility model Figure 2 Enlarged view at point B in the middle;

[0020] The meanings of the labels in the diagram are as follows:

[0021] 1. Valve body; 10. Fluid passage; 11. First gate; 12. Second gate; 13. Movable groove; 14. Mounting groove; 15. First adjusting screw; 150. First driven gear; 16. Pad; 17. Second adjusting screw; 170. Second driven gear; 2. Valve disc; 20. Drive shaft; 21. Drive gear; 22. Retaining ring; 23. Bearing; 24. Return spring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 This utility model provides a technical solution:

[0024] The leak-proof structure of the double-sealed gate valve includes a valve body 1, within which a fluid passage 10 is provided. A first gate 11 and a second gate 12 are respectively installed within the valve body 1 to cut off the fluid passage 10 at two different positions. A movable groove 13 is provided within the valve body 1 for the two gates to move up and down. An installation groove 14 is provided inside the valve body 1 above the fluid passage 10. A first adjusting screw 15 and a second adjusting screw 17 are rotatably mounted on the top of the installation groove 14. The first adjusting screw 15 is threadedly connected to the first gate 11, and the second adjusting screw 17 is threadedly connected to the second gate 12. A drive mechanism is installed above the valve body 1 to drive the first and second adjusting screws to rotate respectively. By using the first gate 11 and the second gate 12 within the valve body 1, the fluid passage 10 can be cut off at two different positions, achieving a double-sealing effect. This design greatly improves the sealing performance of the gate valve; even if one gate leaks, the other gate can still provide an effective seal, thereby ensuring the safe cutoff of the fluid passage 10 and preventing leakage accidents.

[0025] In a preferred embodiment, a first driven gear 150 and a second driven gear 170 are coaxially fixed on the outer circumference of the first and second adjusting screws, respectively. This design enables the drive mechanism to transmit power through the meshing of the drive gear 21 and the driven gear, thereby driving the screw to rotate and controlling the up and down movement of the guillotine, thus achieving effective power transmission and conversion.

[0026] In a preferred embodiment, the drive mechanism includes a valve disc 2, with a drive shaft 20 coaxially fixed to the bottom of the valve disc 2. The bottom of the drive shaft 20 extends into the mounting groove 14, and a drive gear 21 is coaxially fixed to the drive shaft 20 near its bottom end. This design allows the operator to drive the drive shaft 20 to rotate by operating the valve disc 2, thereby driving the drive gear 21 to rotate, achieving remote control of the switch and improving the convenience and safety of operation.

[0027] In a preferred embodiment, a retaining ring 22 is rotatably mounted on the outer circumference of the drive shaft 20 via a bearing 23. The retaining ring 22 is located above the valve body 1, and a return spring 24 is fixedly installed between the bottom of the retaining ring 22 and the top of the valve body 1. The return spring 24 ensures that the valve disc 2 remains in a neutral position when not subjected to external force, preventing the drive gear 21 from simultaneously meshing with two driven gears and avoiding malfunctions. Furthermore, when the valve disc 2 is subjected to external force, the return spring 24 helps the valve disc 2 quickly return to the neutral position, improving operational stability.

[0028] As a preferred embodiment, the drive gear 21 does not mesh with the two driven gears simultaneously. When the valve disc 2 is not subjected to external force, the drive gear 21 is located between the two driven gears in the vertical direction. This design ensures that the valve disc 2 will not drive any of the gates to move in the initial state, and will only drive the corresponding gate to perform the sealing operation after being subjected to a specific external force, thereby improving the accuracy and safety of the operation.

[0029] In a preferred embodiment, when the valve disc 2 moves downward to its lowest position, the drive gear 21 meshes with the second driven gear 170, at which point the return spring 24 is compressed to its shortest length. When the valve disc 2 moves upward to its highest position, the drive gear 21 meshes with the first driven gear 150. This design allows the operator to control the up-and-down movement of the valve disc 2 to drive the first gate 11 and the second gate 12 for sealing operations, achieving independent control of the two gates and improving operational flexibility and reliability.

[0030] In a preferred embodiment, two pads 16 are symmetrically fixedly connected to the top of the mounting groove 14. When the switch contacts the top of the pads 16, the switch moves upward and disengages from the movable groove 13. The pads 16 are used to reduce the stroke of the switch.

[0031] In a preferred embodiment, both the first gate 11 and the second gate 12 are provided with sealing gaskets on their outer walls, and the gates fit tightly against the movable groove 13. The sealing gaskets further improve the sealing performance between the gates and the movable groove 13, preventing fluid from leaking out from the gap between the gates and the movable groove 13, and ensuring the sealing effect of the shut-off valve.

[0032] The anti-leakage structure of the double-sealed shut-off valve of this utility model is as follows:

[0033] First, the shut-off valve is in its initial state. At this time, the valve disc 2 is not subjected to external force, and the drive gear 21 is located vertically between the two driven gears (i.e., the first driven gear 150 and the second driven gear 170) and is not engaged with them. The return spring 24 remains in its natural state, ensuring that the valve disc 2 and the drive gear 21 are in a neutral position. The first gate 11 and the second gate 12 are both located in the movable groove 13, without cutting off the fluid passage 10, allowing the fluid to pass smoothly.

[0034] When a sealing operation is required, the operator selects which gate to drive based on the needs. If the first gate 11 needs to be driven for sealing, the operator moves the valve disc 2 upward. As the valve disc 2 moves upward, the drive shaft 20 and drive gear 21 also move upward. When the drive gear 21 meshes with the first driven gear 150, continuing to rotate the valve disc 2 will drive the first adjusting screw 15 to rotate. Since the first adjusting screw 15 is threadedly connected to the first gate 11, the first gate 11 will move upward as the first adjusting screw 15 rotates, gradually cutting off the first position of the fluid passage 10.

[0035] If the second gate 12 needs to be driven for sealing, the operator moves the valve disc 2 downwards. Similarly, as the valve disc 2 moves downwards, the drive gear 21 meshes with the second driven gear 170, driving the second adjusting screw 17 to rotate. The second gate 12 then moves downwards, cutting off the fluid passage 10 at its second position.

[0036] During the movement of the drive gate, the return spring 24 is stretched or compressed according to the direction of movement of the valve disc 2. When the valve disc 2 moves to its limit position (i.e., the highest or lowest position), the return spring 24 is also stretched or compressed to its limit. At this time, if the operator stops applying external force to the valve disc 2, the return spring 24 will quickly release energy, helping the valve disc 2 to quickly return to the neutral position, ensuring that the drive gear 21 does not mesh with two driven gears simultaneously, and avoiding misoperation.

[0037] When both gates cut off the fluid passage 10, a double seal is achieved. Even if one gate leaks, the other gate can still maintain an effective seal, thus ensuring the safe cut-off of the fluid passage 10.

[0038] Furthermore, the sealing gasket on the outer wall of the gate fits tightly against the movable groove 13, further improving the sealing performance. When the gate moves up or down to contact the pad 16, the gate will disengage from the movable groove 13, reducing the gate's stroke and ensuring that the gate fits tightly against the pad 16 when cutting off the fluid passage 10, thus enhancing the sealing effect.

[0039] In summary, the anti-leakage structure of the double-sealed shut-off valve of this utility model achieves double sealing of the fluid channel 10 and remote control operation through the coordinated action of the first gate 11 and the second gate 12 set in the valve body 1, as well as the corresponding drive mechanism, return spring 24 and other components, thereby improving the sealing performance, ease of operation and safety of the shut-off valve.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A leak-proof structure for a double-sealed shut-off valve, characterized in that: The valve includes a valve body (1), which has a fluid channel (10) inside. The valve body (1) is provided with a first gate (11) and a second gate (12) to cut off the fluid channel (10) at two different positions. The valve body (1) has a movable groove (13) for the two gates to move up and down. The valve body (1) has an installation groove (14) above the fluid channel (10) inside. The top of the installation groove (14) is rotatably mounted with a first adjusting screw (15) and a second adjusting screw (17). The first adjusting screw (15) is threadedly connected to the first gate (11), and the second adjusting screw (17) is threadedly connected to the second gate (12). The valve body (1) is equipped with a drive mechanism for driving the first adjusting screw and the second adjusting screw to rotate respectively.

2. The anti-leakage structure of the double-sealed shut-off valve as described in claim 1, characterized in that: A first driven gear (150) and a second driven gear (170) are coaxially fixed on the outer circumference of the first adjusting screw and the outer circumference of the second adjusting screw, respectively.

3. The anti-leakage structure of the double-sealed shut-off valve as described in claim 2, characterized in that: The drive mechanism includes a valve disc (2), and a drive shaft (20) is coaxially fixed at the bottom of the valve disc (2). The bottom of the drive shaft (20) extends into the mounting groove (14), and a drive gear (21) is coaxially fixed at the bottom end of the drive shaft (20).

4. The anti-leakage structure of the double-sealed shut-off valve as described in claim 3, characterized in that: A fixing ring (22) is rotatably mounted on the outer circumference of the drive shaft (20) via a bearing (23). The fixing ring (22) is located above the valve body (1), and a return spring (24) is fixedly installed between the bottom of the fixing ring (22) and the top of the valve body (1).

5. The anti-leakage structure of the double-sealed shut-off valve as described in claim 4, characterized in that: The drive gear (21) does not mesh with the two driven gears at the same time. When the valve disc (2) is not subjected to external force, the drive gear (21) is located between the two driven gears in the vertical direction.

6. The anti-leakage structure of the double-sealed shut-off valve as described in claim 5, characterized in that: When the valve disc (2) moves downward to its lowest position, the drive gear (21) meshes with the second driven gear (170), at which time the return spring (24) is compressed to its shortest position. When the valve disc (2) moves upward to its highest position, the drive gear (21) meshes with the first driven gear (150).

7. The anti-leakage structure of the double-sealed shut-off valve as described in claim 6, characterized in that: Two pads (16) are symmetrically fixedly connected to the top of the mounting groove (14). When the switch contacts the top and the pads (16), the switch moves upward away from the movable groove (13).

8. The anti-leakage structure of the double-sealed shut-off valve as described in claim 7, characterized in that: Both the first knife gate (11) and the second knife gate (12) are provided with sealing gaskets on their outer walls, and the knife gates are tightly fitted with the movable groove (13).

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