Ultra-large-diameter parallel type double-gate-disc gate valve

Abstract

The utility model discloses an ultra-large-diameter parallel type double-gate-disc gate valve which comprises a valve body, a valve seat body is arranged in the valve body, a valve rod capable of moving up and down is arranged in the valve body, the lower end of the valve rod is connected with a wedge-shaped block, and the two sides of the wedge-shaped block are connected with sealing disc bodies. And at least one set of elastic floating pull rod is arranged between the sealing disc bodies. The large sealing disc has the advantage that the sealing surface of the large sealing disc body is prevented from being damaged by friction with the guide plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gate valve, concretely is a kind of super large caliber parallel double gate plate gate valve. BACKGROUND

[0002] When the center of the two sealing disc bodies (i.e., the gate plate) is away from the upper end position of the valve seat body during opening and closing of the conventional parallel double gate plate gate valve, the sealing disc body (i.e., the gate plate) will be turned outward in the upstream and downstream flow direction. To prevent the sealing disc body (i.e., the gate plate) from turning outward during the opening and closing of the valve, two guide plates are arranged on the opposite sealing surfaces on both sides of the sealing disc body (i.e., the gate plate), so that when the sealing disc body (i.e., the gate plate) turns outward, the sealing surface moves against the guide plate. The weight of the sealing disc body of the large-diameter valve reaches several tons, and a large pressure is generated between the sealing surface of the sealing disc body (i.e., the gate plate) and the guide plate, especially when the valve is close to the fully open position, the pressure is the largest, and wear occurs between the sealing surface of the sealing disc body (i.e., the gate plate) and the guide plate. Frequent opening and closing of the valve can easily cause severe damage to the sealing surface of the sealing disc body, leading to sealing failure and shortening the service life of the valve. In order to change this situation, we removed the guide plate structure and arranged two sets of elastic floating pull rod structures between the two sealing disc bodies, which limited the turning outward of the sealing disc body (i.e., the gate plate) in the upstream and downstream flow direction during the opening and closing of the valve, avoiding the friction and damage of the sealing surface of the large sealing disc body and the guide plate. SUMMARY

[0003] The utility model discloses a kind of super large caliber parallel double gate plate gate valves to solve the problems raised in the above background, which has the advantages of avoiding the friction and damage of the sealing surface of the large sealing disc body and the guide plate.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of super large caliber parallel double gate plate gate valve, including valve body, the valve body is provided with valve seat body, the valve body is provided with the valve stem moving up and down, the lower end of the valve stem is connected with wedge, the two sides of the wedge are connected with sealing disc body, at least a set of elastic floating pull rod is provided between the sealing disc body.

[0005] By adopting the above technical scheme, an elastic floating pull rod is arranged between the two sealing disc bodies, which balances the same outward turning gravity of the two sealing disc bodies. Without setting a guide plate, the two sealing disc bodies can not turn outward, thereby avoiding the friction and damage of the sealing surface of the large sealing disc body and the guide plate, and reducing the wear of the sealing surface of the sealing disc body.

[0006] The elastic floating pull rod comprises a connecting sleeve and a threaded cover threadedly connected with the connecting sleeve, a limiting nut is arranged in the connecting sleeve, the limiting nut is threadedly connected with a connecting shaft partially arranged in the connecting sleeve, the limiting nut is always arranged in the connecting sleeve, and the connecting shaft is sleeved with a compression spring arranged on one side of the limiting nut.

[0007] Preferably, the two sealing disc bodies are respectively fixedly connected with left and right supports, and the left and right supports are respectively provided with left and right pin shafts.

[0008] Preferably, an actuating mechanism for driving the valve rod to move up and down is arranged above the valve rod.

[0009] Preferably, a valve cover is connected above the valve seat body.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] During the whole opening and closing process of the valve, the two sealing disc bodies will not be turned outward, the sealing surface of the sealing disc body and the sealing surface of the valve seat body will not be rubbed by the turning outward force of the sealing disc body, the wear of the sealing surface of the sealing disc body is effectively protected, and the service life of the valve is effectively prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structure schematic view of a prior art gate valve with a guide plate;

[0013] Figure 2 It is a structure schematic view of a prior art gate valve in a closed state;

[0014] Figure 3 It is a structure schematic view of an embodiment in a fully open state;

[0015] Figure 4 It is a structure schematic view of an embodiment in a closed state;

[0016] Figure 5 It is an exploded view of the embodiment;

[0017] Figure 6 It is a top view of the valve body;

[0018] Figure 7 It is an enlarged main view and an enlarged top view of the elastic floating pull rod;

[0019] Figure 8 It is an exploded view of the left and right elastic floating pull rods.

[0020] In the diagram: 1. Actuator; 2. Valve stem; 3. Valve cover; 4. Elastic floating tie rod; 5. Sealing disc body; 6. Sealing disc sealing surface; 7. Wedge block; 8. Valve seat sealing surface; 9. Valve body; 10. Left support; 11. Left pin; 12. Connecting sleeve; 13. Limit nut; 14. Compression spring; 15. Threaded cap; 16. Connecting shaft; 17. Right pin; 18. Right support. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In this embodiment of the utility model,

[0023] A type of ultra-large diameter parallel double gate valve, such as Figures 1-8 As shown, the device includes a valve body 9, within which a valve seat body is disposed. A valve stem 2, which moves vertically, is disposed within the valve body 9. A wedge block 7 is connected to the lower end of the valve stem 2. Sealing disc bodies 5 are connected to both sides of the wedge block 7. At least one set of elastic floating tie rods 4 is disposed between the sealing disc bodies 5. A valve seat sealing surface 8 is provided on one side of the valve seat body. A sealing disc sealing surface 6 is provided on one side of the sealing disc body 5.

[0024] The elastic floating tie rod 4 includes a connecting sleeve 12 and a threaded cap 15 threadedly connected to the connecting sleeve 12. A limiting nut 13 is placed inside the connecting sleeve 12. The limiting nut 13 is threadedly connected to a connecting shaft 16 partially inside the connecting sleeve 12. The limiting nut 13 is always inside the connecting sleeve 12. A compression spring 14 is sleeved on one side of the limiting nut 13.

[0025] The two sealing disc bodies 5 are respectively fixedly connected to a left support 10 and a right support 18, and the left support 10 and the right support 18 are respectively provided with a left pin 11 and a right pin 17.

[0026] An actuator 1 is provided above the valve stem 2 to drive the valve stem 2 to move up and down.

[0027] A valve cover 3 is connected to the top of the valve seat body.

[0028] Working principle:

[0029] Since the two sealing disc bodies 5 are hung in the inner hole of the wedge block 7, when the valve is opened and closed, the actuator 1 drives the valve stem 2 to move up and down, the valve stem 2 is connected with the wedge block 7 to move up and down with the two sealing disc bodies 5, the two sealing disc bodies 5 are balanced outside the wedge block 7, when the center of the left and right sealing disc bodies 5 exceeds the upper end of the sealing surface of the valve seat body, the left and right sealing disc bodies 5 are simultaneously turned outwards to the direction of the upstream and downstream channels of the valve, two sets of elastic floating pull rods 4 are arranged on the back of the two sealing disc bodies 5, and the same outward turning gravity of the two sealing disc bodies 5 is utilized.

[0030] When the valve is opened, the wedge block 7 moves upwards with the valve stem 2, the taper surface of the wedge block 7 also moves upwards, one end of the compression spring 14 abuts against the limiting nut 13 to generate an acting force on the right sealing disc body 5 through the connecting shaft 16 to pull the right sealing disc body 5 to the center of the valve, the sealing surface of the sealing disc body 5 is separated from the sealing surface of the valve seat body, meanwhile, the other end of the compression spring 14 abuts against the plane of the threaded cover 15 to generate an acting force on the left sealing disc body 5 through the connecting sleeve 12 to pull the left sealing disc body 5 to the center of the valve, the sealing surface 6 of the left sealing disc is separated from the sealing surface 8 of the valve seat, and then the wedge block 7 moves upwards with the sealing disc body 5 until the valve is fully opened.

[0031] When the valve is closed, the two sealing disc bodies 5 move downwards with the wedge block 7 until the two sealing disc bodies 5 are in place, the taper surface of the wedge block 7 continues to move downwards, the two sealing disc bodies 5 are pushed to the left and right sealing surfaces 8 of the valve seat, the two sealing disc bodies 5 are compressed through the connecting sleeve 12, the threaded cover 15 and the limiting nut 13 to compress the compression spring 14 until the sealing surface 6 of the sealing disc is combined with the sealing surface 8 of the valve seat, and the valve is fully closed.

[0032] During the opening and closing of the valve, the two sealing disc bodies 5 will not turn outwards, the sealing surface of the sealing disc body 5 will not be rubbed by the outward turning force of the sealing disc body 5, the wear of the sealing surface of the sealing disc body 5 is effectively protected, and the service life of the valve is effectively prolonged.

[0033] The above merely describes a preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model makes equivalent replacement or change, which should be covered in the protection scope of the utility model.

Claims

1. A super-large caliber parallel double-disc gate valve, comprising a valve body (9), a valve seat body is arranged in the valve body (9), a valve rod (2) moving up and down is arranged in the valve body (9), characterized in that: The lower end of the valve stem (2) is connected with a wedge block (7), both sides of the wedge block (7) are connected with sealing disc bodies (5), and at least one set of elastic floating pull rods (4) are arranged between the sealing disc bodies (5).

2. The ultra-large diameter parallel double disk gate valve according to claim 1, characterized in that: The elastic floating pull rod (4) comprises a connecting sleeve (12) and a threaded cover (15) threadedly connected with the connecting sleeve (12), a limiting nut (13) is arranged in the connecting sleeve (12), the limiting nut (13) is threadedly connected with a connecting shaft (16) partially arranged in the connecting sleeve (12), the limiting nut (13) is always arranged in the connecting sleeve (12), and the connecting shaft (16) is sleeved with a compression spring (14) arranged on one side of the limiting nut (13).

3. The ultra-large straightway double-dam plate gate valve according to claim 1, characterized in that: The two sealing disc bodies (5) are respectively fixedly connected with a left support (10) and a right support (18), and the left support (10) and the right support (18) are respectively provided with a left pin shaft (11) and a right pin shaft (17).

4. The ultra-large straightway double-dam plate gate valve according to claim 1, characterized in that: The upper portion of the valve stem (2) is provided with an actuating mechanism (1) for driving the valve stem (2) to move up and down.

5. The ultra-large-port parallel double-dam plate gate valve according to claim 1, characterized in that: The upper portion of the valve seat body is connected with a valve cover (3).

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