Butterfly valve with stable sealing surface structure

Abstract

The utility model discloses a butterfly valve that sealing surface structure is stable, its technical scheme main points are including valve body, the valve seat of being positioned in the valve body, the butterfly plate that can form the sealing with valve seat and drive butterfly plate to rotate the valve stem, be provided with two arc seats that are up and down distribution and all with valve stem coaxial on valve body inner wall, two arc seats all are located the other side of valve stem relative valve seat, be provided with two respectively relative two arc seat outer wall sliding of prevent skew pole on valve stem outer wall, be provided with the close groove of prevent skew pole removal in and be located in the vertical plane of valve seat axis on two arc seat outer wall, make the butterfly plate rotate in the process with valve body inner wall mutual non -interference and after the butterfly plate rotates in place and with valve seat close adhesion through prevent skew pole along arc seat outer wall sliding and to close groove, solved the butterfly plate in the rotation process of existing butterfly plate and caused sealing surface damage and make the problem of poor sealing between butterfly plate and valve seat.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and more specifically to a butterfly valve with a stable sealing surface structure. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve is characterized by a disc-shaped closing element (valve disc or butterfly plate) that rotates around the valve shaft to open and close. Existing butterfly valves, when closed, utilize the thrust of the medium on the butterfly plate to cause the valve stem to bend, resulting in a tight seal between the butterfly plate and the valve seat. However, this design has drawbacks. During the closing process, as the medium flow decreases, the medium accumulates faster on one side of the butterfly plate, gradually increasing the thrust on the plate. This causes the valve stem to bend, and friction occurs between the sealing surface of the butterfly plate and the inner wall of the valve body. This reduces the butterfly plate's rotation efficiency, and frequent opening and closing accelerates wear on the sealing surface, leading to poor sealing between the butterfly plate and the valve seat and potential leakage. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a butterfly valve that can reduce the wear of the sealing surface and has smooth opening and closing.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a butterfly valve with a stable sealing surface structure, comprising a valve body, a valve seat positioned within the valve body, a butterfly plate capable of forming a seal with the valve seat, and a valve stem that drives the butterfly plate to rotate. Two arc-shaped seats are arranged vertically on the inner wall of the valve body and are coaxial with the valve stem. The two arc-shaped seats are positioned opposite the valve seat on the other side of the valve stem. Two anti-skew rods are provided on the outer wall of the valve stem, each sliding relative to the outer walls of the two arc-shaped seats. Each of the outer walls of the two arc-shaped seats has a tight-fitting groove for the anti-skew rods to slide into, located in the vertical plane containing the valve seat axis. By allowing the anti-skew rods to slide along the outer wall of the arc-shaped seats and into the tight-fitting grooves, the butterfly plate does not interfere with the inner wall of the valve body during rotation and, after the butterfly plate has rotated to its position, tightly fits the valve seat.

[0005] As a further improvement of this utility model, the circumference diameter of the end of the arc seat that is not connected to the inner wall of the valve body is smaller than the inner diameter of the valve seat.

[0006] As a further improvement of this utility model, the anti-tilting rod includes a horizontal rod connected to the valve stem and a vertical rod connected to the horizontal rod and capable of sliding relative to the outer wall of the arc seat, wherein the vertical rod is a cylinder.

[0007] As a further improvement of this utility model, a reinforcing rib that does not interfere with the arc seat is provided at the connection between the horizontal bar and the vertical bar.

[0008] The beneficial effects of this utility model are as follows: By sliding the anti-tilt rod along the outer wall of the arc seat and into the sealing groove, the butterfly plate does not interfere with the inner wall of the valve body during rotation and fits tightly with the valve seat after the butterfly plate is rotated into position. Compared with the prior art, this design reduces the influence of the medium on the valve stem when the butterfly plate is not directly aligned with the valve seat, and the valve stem tends to be straight. The butterfly plate does not contact the inner wall of the valve body during rotation, which greatly reduces the wear rate of the butterfly plate sealing surface and ensures the stability of the butterfly plate sealing surface structure. At the same time, the resistance encountered by the butterfly plate during rotation is small, which indirectly improves the efficiency of the butterfly plate rotation and facilitates the opening and closing operation of the butterfly plate. The sealing groove can provide auxiliary positioning when the butterfly plate is rotated into position, improve the accuracy of the rotation angle when the butterfly plate is closed, and facilitate the formation of an effective and stable seal between the butterfly plate and the valve seat. Attached Figure Description

[0009] Figure 1 This is the front view of the present invention;

[0010] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0011] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0012] Figure 4 for Figure 3 Diagram showing the state of the anti-misalignment rod when it has not been rotated into the tight groove;

[0013] Figure 5 This is a partial perspective view of the present invention;

[0014] Figure 6 This is a perspective view of the anti-tilting rod in this utility model.

[0015] Reference numerals: 1. Valve body; 2. Valve seat; 3. Butterfly plate; 4. Valve stem; 5. Arc seat; 6. Anti-tilting rod; 61. Horizontal rod; 62. Vertical rod; 63. Reinforcing rib; 7. Tightening groove. Detailed Implementation

[0016] 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.

[0017] Reference Figures 1 to 6 As shown, a butterfly valve with a stable sealing surface structure according to this embodiment includes a valve body 1, a valve seat 2 positioned inside the valve body 1, a butterfly plate 3 that can form a seal with the valve seat 2, and a valve stem 4 that drives the butterfly plate 3 to rotate.

[0018] Based on the aforementioned prior art, the arc seat 5 is a portion of a cylinder whose inner diameter matches the diameter of the valve stem 4. A tight groove 7 is machined on the outer wall of the arc seat 5. Two arc seats 5 are positioned on the inner wall of the valve body 1 by welding and are distributed vertically. Both arc seats 5 are coaxially arranged with the valve stem 4 and face the valve seat 2. Thus, the arc seats 5 and the valve seat 2 are located on opposite sides of the valve stem 4. The tight groove 7 and the axis of the valve seat 2 are located in the same vertical plane. Then, two threads are machined on the outer wall of the valve stem 4. The anti-skew rod 6 includes an integrally formed horizontal rod 61, a vertical rod 62, and a connecting piece that can fit against the outer wall of the valve stem 4. The connecting piece has a through hole. The vertical rod 62 and the connecting piece are respectively positioned at both ends of the horizontal rod 61. The connecting piece is fitted against the outer wall of the valve stem 4 and the through hole and the threaded hole are coaxial. The anti-skew rod 6 is fixedly connected to the valve stem 4 by using bolts that pass through the connecting piece and screw into the valve stem 4. The vertical rod 62 fits against the outer wall of the arc seat 5, and the horizontal rod 61 spans the end of the arc seat 6 that is not connected to the inner wall of the valve body 1.

[0019] Initially, the medium in the inner cavity of valve body 1 is in a flowing state, flowing from the location of the arc seat 5 to the location of valve seat 2. Valve stem 4 remains straight or has a slight bend. Vertical rod 62 is in contact with the outer wall of arc seat 5 and is adjacent to one of the side walls of arc seat 5. During the closing process, butterfly plate 3 rotates with valve stem 4, and vertical rod 62 slides relative to the outer wall of arc seat 5. As the flow rate of the medium supplied to valve body 1 decreases, the thrust of the medium on butterfly plate 3 gradually increases. Vertical rod 62 is tightly pressed against the outer wall of arc seat 5, valve stem 4 remains straight, butterfly plate 3 is structurally stable and does not contact the inner wall of valve body 1, until butterfly plate 3 rotates to contact the valve seat. 2. In the opposite position, the vertical rod 62 is directly opposite the sealing groove 7. Under the thrust of the medium, the butterfly plate 3 causes the valve stem 4 to bend and deform. The vertical rod 62 enters the corresponding sealing groove 7. The sealing surface of the butterfly plate 3 is tightly fitted with the sealing surface of the valve seat 2. During the opening process, the vertical rod 62 moves out of the sealing groove 7 and slides relative to the outer wall of the arc seat 6. The bending degree of the valve stem 4 decreases, and the sealing surface of the butterfly plate 3 and the sealing surface of the valve seat 2 move away from each other. As the valve stem 4 continues to rotate, the vertical rod 62 slides along the outer wall of the arc seat 6. The flow rate of the medium supplied to the valve body 1 gradually increases, the thrust of the medium on the butterfly plate 3 gradually decreases, and the valve stem 4 gradually returns to the initial state.

[0020] Compared to existing technologies, this design minimizes the impact of the medium on the valve stem 4 when the butterfly plate 3 is not directly aligned with the valve seat 2, keeping the valve stem 4 nearly straight. The butterfly plate 3 does not contact the inner wall of the valve body 1 during rotation, significantly reducing the wear rate of the butterfly plate 3's sealing surface and ensuring the stability of the sealing surface structure. Simultaneously, the low resistance experienced by the butterfly plate 3 during rotation indirectly improves its rotation efficiency, facilitating its opening and closing operations. The tight groove 7 provides auxiliary positioning for the butterfly plate 3 when it is fully rotated, improving the accuracy of the rotation angle when the butterfly plate 3 is closed, and promoting an effective and stable seal between the butterfly plate 3 and the valve seat 2.

[0021] As one specific implementation method of the improvement, refer to Figure 2 As shown, the circumference diameter of the end of the arc seat 5 that is not connected to the inner wall of the valve body 1 is smaller than the inner diameter of the valve seat 2. This design can significantly reduce the length of the valve stem 4 affected by the medium, indirectly improving the bending resistance of the valve stem 4, while reducing the possibility that the edge of the butterfly plate 3 will come into contact with the inner wall of the valve body 1 due to the thrust of the medium.

[0022] As one specific implementation method of the improvement, refer to Figure 6 As shown, the vertical rod 62 is a cylinder. This design reduces the contact area between the vertical rod 62 and the outer wall of the arc seat 5, thereby improving the relative sliding efficiency and indirectly improving the rotation efficiency of the valve stem 4.

[0023] As one specific implementation method of the improvement, refer to Figure 6 As shown, there is a gap between the end faces of the horizontal rod 61 and the arc seat 5. A reinforcing rib 63 that does not interfere with the arc seat 5 is integrally formed at the connection between the horizontal rod 61 and the vertical rod 62. This design can improve the connection stability between the horizontal rod 61 and the vertical rod 62 and avoid the phenomenon that the vertical rod 62 breaks relative to the horizontal rod 61 when the butterfly plate 3 is subjected to the thrust of the medium.

[0024] 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 butterfly valve with a stable sealing surface structure, comprising a valve body (1), a valve seat (2) positioned within the valve body (1), a butterfly plate (3) capable of forming a seal with the valve seat (2), and a valve stem (4) driving the butterfly plate (3) to rotate, characterized in that: The valve body (1) has two arc seats (5) arranged vertically and coaxially with the valve stem (4) on its inner wall. The two arc seats (5) are located on the other side of the valve stem (4) relative to the valve seat (2). The valve stem (4) has two anti-skew rods (6) that slide relative to the outer walls of the two arc seats (5). The outer walls of the two arc seats (5) are provided with tight grooves (7) for the anti-skew rods (6) to move into and located in the vertical plane where the axis of the valve seat (2) is located. The anti-skew rods (6) slide along the outer wall of the arc seats (5) and into the tight grooves (7) so that the butterfly plate (3) does not interfere with the inner wall of the valve body (1) during rotation and fits tightly with the valve seat (2) after the butterfly plate (3) is rotated into place.

2. The butterfly valve with a stable sealing surface structure according to claim 1, characterized in that: The circumference diameter of the end of the arc seat (5) that is not connected to the inner wall of the valve body (1) is smaller than the inner diameter of the valve seat (2).

3. A butterfly valve with a stable sealing surface structure according to claim 1 or 2, characterized in that: The anti-tilting rod (6) includes a horizontal rod (61) connected to the valve stem (4) and a vertical rod (62) connected to the horizontal rod (61) and capable of sliding relative to the outer wall of the arc seat (5). The vertical rod (62) is a cylinder.

4. The butterfly valve with a stable sealing surface structure according to claim 3, characterized in that: The connection between the horizontal rod (61) and the vertical rod (62) is provided with a reinforcing rib (63) that does not interfere with the arc seat (5).

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