Butterfly valve with valve rod soft sealing structure

Abstract

The utility model belongs to the technical field of soft sealing butterfly valves, and particularly relates to a butterfly valve with a valve rod soft sealing structure, which comprises a butterfly valve body and a fixing block arranged on the surface of the butterfly valve body, the surface of the fixing block is connected with a valve rod in a penetrating way, the bottom end of the valve rod is connected with a valve core plate, and the valve core plate is positioned at the center of the butterfly valve body; a first upper sealing gasket is connected to the bottom end, close to the valve rod, of the fixing block, a second upper sealing gasket is connected to the top end, close to the valve rod, of the fixing block, and a clamping plate is connected to an opening in the surface of the fixing block. In addition, the clamping plate is clamped on the fixing block, sealing of a gap at the top end of the butterfly valve body is guaranteed, the effect of water seepage between the valve rod and the top end of the butterfly valve body is avoided, and sealing performance of the valve element plate on the inner wall of the butterfly valve body and waterproofness of the connecting position of the valve rod are guaranteed by using the sealing ring.

Description

Technical Field

[0001] The utility model belongs to the technical field of soft-sealing butterfly valves, and particularly relates to a butterfly valve with a valve stem soft-sealing structure. Background Art

[0002] A soft-sealing butterfly valve refers to a valve whose closing member (butterfly plate) is a disc and rotates around the valve shaft to achieve opening and closing. The butterfly plate is driven by the valve stem. If it rotates 90°, a single opening and closing can be completed. The soft-sealing butterfly valve controls the flow rate of the medium by changing the deflection angle of the butterfly plate. The soft-sealing butterfly valve is decelerated through worm and worm gear transmission (the electric valve is decelerated through the worm and worm gear transmission of the motor). The valve shaft drives the butterfly plate to rotate within 90°, so that the butterfly plate is in an open or closed state to achieve the purpose of connecting or cutting off the medium. Its structure is a double-eccentric sealing structure. When the valve is fully open, the butterfly plate sealing ring is in a relaxed state; when the valve is closed, the sealing ring is squeezed by the valve body sealing surface and the butterfly plate, generating elastic deformation, so that the sealing force between the valve sealing surfaces gradually reaches the maximum value;

[0003] Soft-sealing butterfly valves are widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, food, medicine, water treatment, beverage production, pharmaceutical manufacturing, mining, thermal power plants, nuclear power plants, and hydropower stations. It can be used in various occasions such as sewage treatment, water supply and drainage, seawater desalination, chemical solution and gas pipelines, beverage production lines, various liquid and gas treatments in pharmaceutical production, transportation and processing of petroleum and natural gas, and various liquid and gas treatments in mining and metallurgy production. During the use of the soft-sealing butterfly valve, the valve stem is manipulated to drive the opening of the valve core plate. However, after long-term rotation, friction occurs between the valve stem and the soft-sealing butterfly valve, resulting in gaps, causing water seepage at the valve stem of the soft-sealing butterfly valve, affecting the water closing effect of the soft-sealing butterfly valve, and reducing the sealing effect of the soft-sealing butterfly valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a butterfly valve with a valve stem soft-sealing structure, aiming to solve the problem that in the prior art, during the use of the above-mentioned soft-sealing butterfly valve, the valve stem is manipulated to drive the opening of the valve core plate. However, after long-term rotation, friction occurs between the valve stem and the soft-sealing butterfly valve, resulting in gaps, causing water seepage at the valve stem of the soft-sealing butterfly valve, affecting the water closing effect of the soft-sealing butterfly valve, and reducing the sealing effect of the soft-sealing butterfly valve.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A butterfly valve with a valve stem soft-sealing structure, including a butterfly valve body and a fixing block installed on the surface of the butterfly valve body. The surface of the fixing block is penetrated and connected with a valve stem. The bottom end of the valve stem is connected with a valve core plate, and the valve core plate is located at the center of the butterfly valve body;

[0006] A first upper sealing gasket is connected to the bottom end of the fixed block close to the valve stem, a second upper sealing gasket is connected to the top end of the fixed block close to the valve stem, a clamping plate is connected to the opening on the surface of the fixed block, a mounting plate is connected to the bottom end on the outside of the clamping plate, a sealing ring is connected to the bottom end on the inside of the clamping plate, and a mounting groove is formed at the opening of the fixed block close to the sealing ring.

[0007] As a preferred embodiment of the butterfly valve with a valve stem soft sealing structure of the present utility model, both the first upper sealing gasket and the second upper sealing gasket are made of rubber.

[0008] As a preferred embodiment of the butterfly valve with a valve stem soft sealing structure of the present utility model, the clamping plate is made of stainless steel, and the clamping plate and the mounting groove on the surface of the fixed block form a clamping structure through the mounting plate.

[0009] As a preferred embodiment of the butterfly valve with a valve stem soft sealing structure of the present utility model, the sealing ring is connected to the clamping plate by glue, and the inner side of the sealing ring is in contact with the surface of the valve stem.

[0010] As a preferred embodiment of the butterfly valve with a valve stem soft sealing structure of the present utility model, a lower sealing gasket is installed at the opening on the bottom surface of the butterfly valve body.

[0011] As a preferred embodiment of the butterfly valve with a valve stem soft sealing structure of the present utility model, a sealing ring is provided at the bottom end of the lower sealing gasket, sealing protrusions are installed on the surface of the sealing ring, both the sealing protrusions and the sealing ring are made of rubber, and a groove is formed at the opening of the butterfly valve body close to the sealing protrusions.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] By using the first upper sealing gasket and the second upper sealing gasket, the present utility model ensures the sealing performance at the connection between the valve stem and the butterfly valve body. In addition, by clamping the clamping plate on the fixed block, the sealing at the top gap of the butterfly valve body is ensured, avoiding water seepage at the top of the valve stem and the butterfly valve body. In addition, by using the sealing ring, the sealing performance of the valve core plate on the inner wall of the butterfly valve body is ensured, and the waterproof performance at the connection of the valve stem is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0015] Figure 1 is a schematic diagram of the overall structure of the soft-sealing butterfly valve of the present utility model;

[0016] Figure 2 is a schematic diagram of the partial sectional structure of the soft-sealing butterfly valve of the present utility model;

[0017] Figure 3 Schematic cross-sectional structure diagram of the butterfly valve body of the present utility model;

[0018] Figure 4 Enlarged structure diagram at position A of the present utility model;

[0019] Figure 5 Schematic structure diagram of the clamping plate of the present utility model;

[0020] Figure 6 Enlarged structure diagram at position B of the present utility model.

[0021] In the figure: 1, butterfly valve body; 2, fixing block; 3, valve stem; 4, valve core plate; 5, first upper sealing gasket; 6, second upper sealing gasket; 7, clamping plate; 71, mounting plate; 72, sealing ring; 73, mounting groove; 8, lower sealing gasket; 9, sealing ring; 91, sealing rib; 92, groove. Specific implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with 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 in 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.

[0023] Please refer to Figures 1-6 , the present utility model provides the following technical solutions: A butterfly valve with a valve stem soft sealing structure includes a butterfly valve body 1 and a fixing block 2 installed on the surface of the butterfly valve body 1. A valve stem 3 penetrates through the surface of the fixing block 2, and the bottom end of the valve stem 3 is connected to a valve core plate 4, and the valve core plate 4 is located at the center of the butterfly valve body 1;

[0024] A first upper sealing gasket 5 is connected to the bottom end of the fixing block 2 near the valve stem 3, a second upper sealing gasket 6 is connected to the top end of the fixing block 2 near the valve stem 3, a clamping plate 7 is connected to the opening of the surface of the fixing block 2, a mounting plate 71 is connected to the outer bottom end of the clamping plate 7, a sealing ring 72 is connected to the inner bottom end of the clamping plate 7, and a mounting groove 73 is opened at the opening of the fixing block 2 near the sealing ring 72.

[0025] Preferably: Both the first upper sealing gasket 5 and the second upper sealing gasket 6 are made of rubber material.

[0026] Preferably: The clamping plate 7 is made of stainless steel, and the clamping plate 7 and the mounting groove 73 on the surface of the fixing block 2 form a clamping structure through the mounting plate 71.

[0027] During specific use, by adopting a clamping method, it is ensured that the clamping plate 7 can be used for a long time.

[0028] Preferably, the sealing ring 72 is connected to the clamping plate 7 by glue, and the inner side of the sealing ring 72 is in contact with the surface of the valve stem 3.

[0029] During specific use, by using the sealing ring 72, it is convenient to seal the top opening of the butterfly valve body 1 and improve the sealing performance at the connection of the valve stem 3.

[0030] Preferably, a lower sealing gasket 8 is installed at the bottom opening of the butterfly valve body 1.

[0031] During specific use, by using the lower sealing gasket 8, it is convenient to seal the connection between the valve stem 3 and the bottom opening of the butterfly valve body 1.

[0032] Preferably, a sealing ring 9 is provided at the bottom end of the lower sealing gasket 8, and sealing ridges 91 are installed on the surface of the sealing ring 9. Both the sealing ridges 91 and the sealing ring 9 are made of rubber. A groove 92 is formed at the opening of the butterfly valve body 1 near the sealing ridges 91.

[0033] During specific use, by using the sealing ridges 91, it is convenient to stably install the sealing ring 9 and ensure the water-stopping effect at the bottom end of the butterfly valve body 1.

[0034] The working principle of the present utility model during specific use: First, by using the first upper sealing gasket 5 and the second upper sealing gasket 6, the primary sealing performance at the connection between the valve stem 3 and the butterfly valve body 1 is ensured. In addition, the clamping plate 7 is clamped on the fixed block 2. During specific use, the mounting plate 71 at the bottom end of the clamping plate 7 is clamped and butted with the mounting groove 73 on the surface of the fixed block 2. Then, the sealing ring 72 contacts the valve stem 3 to isolate the butterfly valve body 1 from the outside, ensuring the sealing of the top gap of the butterfly valve body 1 and avoiding water seepage at the top of the valve stem 3 and the butterfly valve body 1. In addition, by using the sealing ring 9, during specific use, the sealing ridges 91 on the surface of the sealing ring 9 are fitted into the inner wall of the groove 92 to ensure the sealing performance of the valve core plate 4 on the inner wall of the butterfly valve body 1 and ensure the waterproof performance at the connection of the valve stem 3.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A butterfly valve with a valve stem soft seal structure, comprising a butterfly valve body (1) and a fixed block (2) installed on the surface of the butterfly valve body (1), characterized in that: A valve rod (3) penetrates and is connected to the surface of the fixed block (2), and a valve core plate (4) is connected to the bottom end of the valve rod (3). The valve core plate (4) is located at the center of the butterfly valve body (1). A first upper sealing gasket (5) is connected to the fixed block (2) near the bottom end of the valve rod (3), and a second upper sealing gasket (6) is connected to the fixed block (2) near the top end of the valve rod (3). A clamping plate (7) is connected to the opening of the surface of the fixed block (2). An installation plate (71) is connected to the outer bottom end of the clamping plate (7), and a sealing ring (72) is connected to the inner bottom end of the clamping plate (7). An installation groove (73) is formed at the opening of the fixed block (2) near the sealing ring (72).

2. The butterfly valve with a valve stem soft seal structure according to claim 1, characterized in that: Both the first upper sealing gasket (5) and the second upper sealing gasket (6) are made of rubber material.

3. The butterfly valve with a valve stem soft seal structure according to claim 1, wherein: The clamping plate (7) is made of stainless steel, and the clamping plate (7) and the installation groove (73) on the surface of the fixed block (2) form a clamping structure through the installation plate (71).

4. A butterfly valve with a valve stem soft seal structure according to claim 1, characterized in that: The sealing ring (72) is connected to the clamping plate (7) by glue, and the inner side of the sealing ring (72) is in contact with the surface of the valve rod (3).

5. The butterfly valve with a valve stem soft seal structure according to claim 1, characterized in that: A lower sealing gasket (8) is installed at the opening of the bottom surface of the butterfly valve body (1).

6. The butterfly valve with a valve stem soft seal structure according to claim 5, characterized in that: A sealing ring (9) is arranged at the bottom end of the lower sealing gasket (8). A sealing rib (91) is installed on the surface of the sealing ring (9). Both the sealing rib (91) and the sealing ring (9) are made of rubber material. A groove (92) is formed at the opening of the butterfly valve body (1) near the sealing rib (91).

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