Knife gate valve capable of preventing seal ring from falling off

Abstract

The utility model discloses a knife gate valve that can prevent the seal ring from falling off, and its technical scheme points are as follows: a valve body, a gate plate inserted into the valve body and a seal ring capable of forming a soft seal with the gate plate, a groove for accommodating the seal ring is arranged in the valve body, the seal ring is provided with a supporting groove with an opening facing the groove bottom, a tenon capable of extending into the supporting groove and supporting the seal ring is arranged in the groove, and the inner wall and the outer wall of the seal ring are tightly combined with the two groove walls of the groove by supporting the seal ring with the tenon, thereby solving the problem that the seal ring is prone to falling off in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of knife gate valve technology, and more specifically to a knife gate valve that can prevent the sealing ring from falling off. Background Technology

[0002] As attached Figure 1 As shown, the existing soft-seal knife gate valve includes a valve body 1, a gate 2, and a sealing ring 3. A groove 4 is machined on the sealing surface of the valve body 1, and the sealing ring 3 is installed in the groove 4. After the gate 2 moves down into place, the sealing ring 3 fits tightly with one side of the gate 2 to form a soft seal. However, the existing technology has defects. The sealing ring 3 is made of soft material, and the sealing ring 3 is easily deformed by environmental influences or adheres to the gate 2 and is easily moved by the gate 2. Both of the above situations will cause the sealing ring 3 to detach from the groove 4, resulting in a short service life. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a knife gate valve that can prevent the sealing ring from falling off.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a knife gate valve that prevents the sealing ring from falling off, comprising a valve body, a gate plate inserted into the valve body, and a sealing ring that can form a soft seal with the gate plate. The valve body is provided with a groove for accommodating the sealing ring. The sealing ring is provided with a support groove with its opening facing the bottom of the groove. A tenon is provided in the groove that can extend into the support groove and support the sealing ring. The tenon supports the sealing ring so that the inner wall and outer wall of the sealing ring are tightly fitted with the two groove walls of the groove, respectively.

[0005] As a further improvement of this utility model, the support groove is a V-shaped groove, and the tenon has a triangular cross-sectional shape with its large end facing the bottom of the groove.

[0006] As a further improvement of this utility model, a positioning groove is provided on the bottom of the groove for partial accommodation of the tenon.

[0007] As a further improvement of this utility model, the groove is a dovetail groove.

[0008] The beneficial effects of this utility model are as follows: By using tenons to open the sealing ring, the inner and outer walls of the sealing ring are tightly fitted with the two groove walls of the groove. Compared with the prior art, this design, which uses tenons to open the sealing ring, ensures the connection stability of the sealing ring in the groove by the static friction between the groove and the sealing ring, as well as the static friction between the tenons and the sealing ring, thus preventing the sealing ring from coming out of the groove and indirectly extending the service life of the sealing ring. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of existing technology;

[0010] Figure 2 This is a schematic diagram of the present invention;

[0011] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0012] Reference numerals in the attached diagram: 1. Valve body; 2. Gate; 3. Sealing ring; 4. Groove; 5. Spreading groove; 6. Tenon; 7. Positioning groove. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0014] Reference Figures 1 to 3 As shown, a knife gate valve that can prevent the sealing ring from falling off in this embodiment includes a valve body 1, a gate plate 2 inserted in the valve body 1, and a sealing ring 3 that can form a soft seal with the gate plate 2. A groove 4 for accommodating the sealing ring 3 is provided in the valve body 1.

[0015] Based on the aforementioned prior art, the sealing ring 3 is made of rubber material. It can be manufactured by using a specified mold and injection molding process to produce a sealing ring 3 with a support groove 5. Alternatively, the support groove 5 can be further cut into one of the annular surfaces of the sealing ring 3 in the prior art. The support groove 5 is a V-shaped groove with its opening located on the annular surface of the sealing ring 3. The support groove 5 is coaxial with the sealing ring 3 and is annular. The cross-sectional shape of the tenon 6 is triangular. The cross-sectional profile dimension of the support groove 5 in its natural state is smaller than that of the cross-sectional profile dimension of the tenon 6. There are two main types of tenon 6 structures: first, the tenon 6 is a tenon block and there are multiple of them; second, the tenon 6 is an annular body that can be coaxial with the sealing ring 3. The structure of the aforementioned two types of tenon 6 is selected according to the actual production requirements.

[0016] During assembly, the tenon 6 is first placed in the expansion groove 5. Then, the annular surface of the sealing ring 3 with the expansion groove 5 is oriented towards the groove 4. By manually applying pressure to the sealing ring 3, one end of the sealing ring 3 smoothly enters the groove 4. Then, the pressure is released, the sealing ring 3 returns to its original shape, and the expansion groove 5 returns to its open state. As the sealing ring 3 goes deeper into the groove 4, the tip of the tenon 6 enters the expansion groove 5 first. Then, the side wall of the tenon 6 contacts and slides relative to the groove wall of the expansion groove 5. The expansion groove 5 is gradually expanded by the tenon 6, and the sealing ring 3 deforms until the sealing ring 3 touches the bottom of the groove 4. The tenon 6 is inserted into the expansion groove 5 and the expansion groove 5 is expanded to its maximum. The inner wall and outer wall of the sealing ring 3 are tightly fitted with the two groove walls of the groove 4, respectively.

[0017] Compared with existing technologies, this design uses the tenon 6 to open the sealing ring 3, so that the static friction between the groove 4 and the sealing ring 3, as well as the static friction between the tenon 6 and the sealing ring 3, together ensure the connection stability of the sealing ring 3 in the groove 4, prevent the sealing ring 3 from coming out of the groove 4, and indirectly extend the service life of the sealing ring 3.

[0018] As one specific implementation of the improvement, when the sealing ring 3 is not installed in place, the tenon 6 is prone to translation within the groove 4, affecting the subsequent assembly efficiency of the sealing ring 3 and the tenon 6. To solve the aforementioned problem, refer to Figure 3 As shown, a positioning groove 7 is machined on the bottom of the groove 4 to partially accommodate the tenon 6. This design ensures that the tenon 6 is in a fixed position in the groove 4, which facilitates the smooth insertion of the tenon 6 into the support groove 5. Compared with the design of gluing the tenon 6 to the bottom of the groove 4, it is easier to replace the tenon 6.

[0019] As one specific implementation method of the improvement, refer to Figure 3 As shown, the groove 4 is a dovetail groove. Compared with the rectangular cross-section of the groove 4, this design can further improve the connection stability of the sealing ring 3 in the groove 4 and more effectively prevent the sealing ring 3 from coming out of the groove 4.

[0020] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A knife gate valve capable of preventing the sealing ring from falling off, comprising a valve body (1), a gate plate (2) inserted into the valve body (1), and a sealing ring (3) capable of forming a soft seal with the gate plate (2), wherein the valve body (1) is provided with a groove (4) for accommodating the sealing ring (3), characterized in that: The sealing ring (3) is provided with a support groove (5) with the opening facing the bottom of the groove (4). The groove (4) is provided with a tenon (6) that can extend into the support groove (5) and support the sealing ring (3). The sealing ring (3) is supported by the tenon (6) so that the inner wall and outer wall of the sealing ring (3) are tightly fitted with the two groove walls of the groove (4).

2. A knife gate valve according to claim 1 that prevents the sealing ring from falling off, characterized in that: The support groove (5) is a V-shaped groove, and the tenon (6) has a triangular cross-section with its large end facing the bottom of the groove (4).

3. A knife gate valve according to claim 1 or 2 that prevents the sealing ring from falling off, characterized in that: The groove (4) has a positioning groove (7) on the bottom for partial accommodation of the tenon (6).

4. A knife gate valve according to claim 1 or 2 that prevents the sealing ring from falling off, characterized in that: The groove (4) is a dovetail groove.

Images