Soft-seal pneumatic ball valve

Abstract

The utility model discloses a kind of soft sealing pneumatic ball valves, and its technical solution main point is that ring groove is provided with spacer ring, ring groove is divided into inner sealing groove and outer sealing groove by spacer ring, spacer ring is provided with multiple perforations, the hole wall of perforation adjacent to sphere is relatively inclinedly arranged on the plane where perforation axis is located, outer sealing groove is provided with outer push ring, multiple outer springs that are circumferentially distributed around valve seat axis and outer soft sealing ring that can move synchronously with outer push ring, inner sealing groove is provided with inner push ring, multiple inner springs that are circumferentially distributed around valve seat axis, inner soft sealing ring that can move synchronously with inner push ring and multiple limit rods, which can be radially elastically moved along inner push ring and respectively penetrate multiple perforations, the end portion of multiple limit rods that extends into outer sealing groove can be in contact with the end surface of outer push ring towards sphere, the end portion of multiple limit rods that extends into outer sealing groove is provided with sliding inclined surface that can slide relative to the inclined hole wall of perforation, solve the problem that prior art maintenance cycle is short and prone to leakage.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and more specifically to a soft-seal pneumatic ball valve. Background Technology

[0002] Ball valves control the flow of media in pipelines by rotating the valve ball through the valve stem. They are mainly used in petrochemical, coal chemical, pipeline transportation, and municipal applications. The main seal of existing ball valves is between the ball and the valve seat. There are two sealing methods: the first uses a metal valve seat, forming a hard seal between the seat and the ball; the second uses a non-metallic valve seat or adds a soft sealing element to the valve seat, forming a soft seal between the seat and the ball, or between the sealing element and the ball. Soft seals require less opening and closing torque than hard seals, and the valve seat or sealing element deforms to fully fit the ball surface, resulting in a more stable and effective seal. However, soft seals have drawbacks. Soft sealing elements or non-metallic valve seats wear quickly, leading to gaps between the soft sealing element or non-metallic valve seat and the ball, causing seal failure. They also have short maintenance cycles, and frequent disassembly and assembly of pneumatic actuators and other components can easily cause leaks in other parts, indirectly reducing the overall sealing performance of the ball valve. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pneumatic ball valve with stable sealing between the ball and the valve seat and long maintenance cycle.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a soft-seal pneumatic ball valve, comprising a valve body, a ball located within the valve body, and a valve seat capable of forming a seal with the ball. The valve seat has an annular groove coaxial with the ball on its surface facing the ball. A spacer ring coaxial with the valve seat is disposed within the annular groove. The annular groove is divided by the spacer ring into an inner sealing groove and an outer sealing groove coaxially arranged. Multiple perforations circumferentially distributed around the axis of the spacer ring are disposed on the ring wall. The wall of the perforation near the ball is inclined relative to the plane containing the perforation axis. An outer push ring coaxial with the valve seat is disposed within the outer sealing groove, along with multiple outer springs circumferentially distributed around the valve seat axis and located between the bottom of the outer sealing groove and the outer push ring, and springs capable of moving synchronously with the outer push ring. The outer soft sealing ring is movable and can fit against the ball. The inner sealing groove is provided with an inner push ring coaxial with the valve seat, multiple inner springs that are all limited between the bottom of the inner sealing groove and the inner push ring and are circumferentially distributed around the valve seat axis, an inner soft sealing ring that can move synchronously with the inner push ring and fit against the ball, and multiple limiting rods that can move elastically along the inner push ring and pass through multiple perforations. The ends of the multiple limiting rods that extend into the outer sealing groove can contact the end face of the outer push ring facing the ball. The ends of the multiple limiting rods that extend into the outer sealing groove are provided with sliding inclined surfaces that can slide relative to the inclined hole wall of the perforation. By sliding the sliding inclined surfaces relative to the inclined hole wall of the perforation, the outer push ring is removed from the outer sealing groove, so that the outer soft sealing ring is driven to fit against the ball under the action of the outer spring.

[0005] As a further improvement of this utility model, the inner push ring and the outer push ring are respectively provided with positioning pins that can be inserted into the inner spring and the outer spring.

[0006] As a further improvement of this utility model, the bottom of the inner sealing groove and the outer sealing groove are respectively provided with positioning grooves for one end of the inner spring and the outer spring to extend into.

[0007] The beneficial effects of this utility model are as follows: by sliding the inclined plane relative to the inclined hole wall of the perforation and exiting the outer sealing groove, the outer push ring is driven by the outer spring to bring the outer soft sealing ring into contact with the ball. Compared with the existing technology, this design can make up for the failure of the inner soft sealing ring in time by the outer soft sealing ring, ensuring the stability of the soft seal between the valve seat and the ball, extending the maintenance cycle, and indirectly improving the overall sealing performance of the ball valve. Attached Figure Description

[0008] Figure 1 This is a front sectional view of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 Diagram showing the state of the inner soft seal ring after wear and the limiting rod still restricting the movement of the outer push ring; Figure 4 for Figure 3 Diagram showing the state of the inner soft seal ring after wear and the limiting rod not restricting the movement of the outer push ring; Figure 5 This is a perspective view of the valve seat in this utility model; Figure 6 for Figure 5 Exploded view.

[0009] Reference numerals in the attached diagram: 1. Valve body; 2. Ball; 3. Valve seat; 4. Annular groove; 5. Spacer ring; 51. Perforation; 6. Inner sealing groove; 61. Inner push ring; 62. Inner spring; 63. Inner soft sealing ring; 64. Limiting rod; 65. Sliding inclined surface; 7. Outer sealing groove; 71. Outer push ring; 72. Outer spring; 73. Outer soft sealing ring; 8. Positioning pin; 9. Positioning groove. Detailed Implementation

[0010] 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.

[0011] Reference Figures 1 to 6 As shown, a soft-seal pneumatic ball valve of this embodiment includes a valve body 1, a ball 2 located inside the valve body 1, and a valve seat 3 that can form a seal with the ball 2. An annular groove 4 coaxial with the valve seat 3 is provided on the surface of the valve seat 3 facing the ball 2. Based on the aforementioned prior art, the spacer ring 5 has multiple perforations 51 circumferentially distributed around its axis on its ring wall. The inner wall of one end of each perforation 51 is obliquely cut to create an inclined hole wall, referred to as the inclined hole wall. The other end of the spacer ring 5 is then inserted into the annular groove 4 and welded to the bottom of the groove. The spacer ring 5 divides the inner cavity of the annular groove 4 into an independent inner sealing groove 6 and an outer sealing groove 7, coaxial with the valve seat 3. One end of the outer soft sealing ring 73 is bonded to the annular surface of the outer push ring 71. The inner wall is machined with a receiving groove adjacent to the outer push ring 71, which is used to bond one end of the inner soft sealing ring 63 to the annular surface of the inner push ring 61. The inner push ring 61 includes an arc ring and a limiting assembly with the same number as the through hole 51. The limiting assembly includes a limiting shell that can weld arc rings on both sides, a limiting rod 64 that is limited to one end in the limiting shell, and a limiting spring that is limited to the limiting shell and pushes the limiting rod 64 out of the limiting shell. The end of the limiting rod 64 that is outside the limiting shell is machined with a sliding inclined surface 65 that can fit against the inclined wall of the hole and slide relative to the inclined wall of the hole. During assembly, multiple workers are required to work together to lay the valve seat 3 flat so that the openings of the outer sealing groove 7 and the inner sealing groove 6 are both facing upwards. Multiple outer springs 72 are installed in the outer sealing groove 7 and distributed along the length of the outer sealing groove 7. The multiple outer springs 72 are perpendicular to the bottom of the outer sealing groove 7. Then, the outer push ring 71 and the outer soft sealing ring 73 are first installed in the outer sealing groove 7. One end of each of the multiple outer springs 72 is in contact with the outer push ring 71, maintaining external force to press the outer soft sealing ring 73 so that the outer push ring 71... The height of the inner spring 62 is lower than the height of the connection between the inclined wall of the hole and the through hole 51. Then, multiple inner springs 62 are installed into the inner sealing groove 6 and distributed along the length of the inner sealing groove 6. The multiple inner springs 62 are perpendicular to the bottom of the inner sealing groove 6. Then, the limiting rod 64 is manually pressed into the limiting shell, and the inner push ring 61 and the inner soft sealing ring 63 are first installed into the inner sealing groove 6. The limiting rod 64 moves towards the inner wall of the spacer 5 under the action of the limiting spring without being subjected to external force. The end of the limiting rod 64 touches the inner wall of the spacer 5. As the inner push ring 61 and the inner soft sealing ring 63 continue to move synchronously into the inner sealing groove 6, one end of each of the multiple inner springs 62 contacts the inner push ring 61. The end of the limiting rod 64 separates from the inner wall of the spacer ring 5 and contacts the corresponding inclined wall of the hole. The sliding inclined surface 65 slides against the corresponding inclined wall of the hole until the end of the limiting rod 64 passes through the through hole 51 and enters the receiving groove on the inner wall of the outer soft sealing ring 73. One side wall of the limiting rod 64 contacts the outer push ring 71. At this time, the outer soft sealing ring 73 is removed. The force applied continues to press the inner soft sealing ring 63 into the soft sealing groove 6. The length of the limiting rod 64 extending into the outer sealing groove 7 increases and drives the outer push ring 71 and the outer soft sealing ring 73 to move into the outer sealing groove 7 as a whole. After the sliding inclined surface 65 separates from the inclined wall of the hole, the limiting rod 64 will not extend further. The sliding inclined surface 65 has not completely entered the outer sealing groove 7. Finally, the valve seat 3 containing the inner soft sealing ring 6 and the outer soft sealing ring 7 is installed in the valve body 1, and the ball 2 and other parts are assembled on the valve body 1 one after another. Initially, the inner spring 62 pushes the inner push ring 61, causing the inner soft sealing ring 63 to fully adhere to the surface of the ball 2. The outer push ring 71 is restricted by the limiting rod 64 and cannot move under the action of the outer spring 72. The end face of the outer soft sealing ring 73 facing the ball 2 is not adhered to the surface of the ball 2 and is located in the outer sealing groove 7. After long-term use, the inner soft sealing ring 63 wears and shortens, the inner spring 62 gradually lengthens, and the outer push ring 71 can move under the push of the outer spring 72 as the inner spring 62 changes. The distance between the outer soft sealing ring 73 and the ball 2 decreases, the limiting rod 64 moves towards the inclined wall of the hole, and the sliding inclined surface 65 partially adheres to the inclined wall of the hole. As the inner soft sealing ring 63 wears and shortens, the inner soft sealing ring 63 moves towards the inclined wall of the hole, and the outer soft sealing ring 63 moves towards the inclined wall of the hole. As the length of the sealing ring 63 continues to shorten, the limiting rod 64 slides relative to the inclined wall of the hole and gradually exits the outer sealing groove 7 until the limiting rod 64 separates from the outer push ring 71. The outer spring 72 pushes the outer push ring 71 and the outer soft sealing ring 73 to move as a whole, so that one end of the outer sealing ring 73 is in contact with the surface of the ball 2. At this time, the inner spring 62 has little or no elasticity due to its extension. The inner soft sealing ring 63 has little or no contact with the surface of the ball 2. The outer soft sealing ring 73 and the inner soft sealing ring 63 form a double seal or replace the inner soft sealing ring 63 to make up for the seal between the valve seat 3 and the ball 2, until the outer soft sealing ring 73 fails due to wear. At this time, the sealing ring needs to be disassembled and replaced. Compared with existing technologies, this design can compensate for the failure of the inner soft sealing ring 63 by the outer soft sealing ring 73 in a timely manner, ensuring the stability of the soft seal between the valve seat 3 and the ball 2, extending the maintenance cycle, and indirectly improving the overall sealing performance of the ball valve.

[0012] As one specific implementation method of the improvement, refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the inner push ring 61 and the outer push ring 71 are respectively provided with positioning pins 8 that can pass through the inner spring 62 and the outer spring 72. The length of the positioning pin 8 is less than the distance between the push ring and the bottom of the sealing groove. By inserting the positioning pin 8 into the end of the corresponding spring, the end of the spring is in direct contact with the ring surface of the corresponding push ring. The direction of the spring force is constant and it will not bend, thus improving the spring transmission efficiency.

[0013] As one specific implementation method of the improvement, refer to Figures 2 to 4 As shown, positioning grooves 9 are respectively provided on the bottom of the inner sealing groove 6 and the outer sealing groove 7 for one end of the inner spring 62 and the outer spring 72 to extend into. Inserting one end of the spring into the positioning groove 9 in the corresponding sealing groove can prevent the spring from tipping over and improve assembly efficiency.

[0014] 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 soft-seal pneumatic ball valve, comprising a valve body (1), a ball (2) located within the valve body (1), and a valve seat (3) capable of forming a seal with the ball (2), wherein the valve seat (3) has an annular groove (4) coaxial with the valve seat (3) on its surface facing the ball (2), characterized in that: The annular groove (4) is provided with a spacer ring (5) coaxial with the valve seat (3). The annular groove (4) is divided into an inner sealing groove (6) and an outer sealing groove (7) coaxially arranged by the spacer ring (5). The annular wall of the spacer ring (5) is provided with a plurality of perforations (51) arranged in a circular pattern around the axis of the spacer ring (5). The perforation wall of the perforation (51) near the ball (2) is inclined relative to the plane where the axis of the perforation (51) is located. The outer sealing groove (7) is provided with an outer push ring (71) coaxial with the valve seat (3), a plurality of outer springs (72) located between the bottom of the outer sealing groove (7) and the outer push ring (71) and arranged in a circular pattern around the axis of the valve seat (3), and an outer soft sealing ring (73) that can move synchronously with the outer push ring (71) and fit with the ball (2). The inner sealing groove (6) is provided with an inner push ring (61) coaxial with the valve seat (3), a plurality of inner springs (72) located between the bottom of the outer sealing groove (7) and the outer push ring (71) and arranged in a circular pattern around the axis of the valve seat (3), and an outer soft sealing ring (73) that can move synchronously with the outer push ring (71) and fit with the ball (2). The groove (6) consists of an inner spring (62) distributed circumferentially between the bottom of the groove and the inner push ring (61) and around the axis of the valve seat (3); an inner soft sealing ring (63) that can move synchronously with the inner push ring (61) and fit against the ball (2); and multiple limiting rods (64) that can move radially elastically along the inner push ring (61) and pass through multiple through holes (51). The ends of the multiple limiting rods (64) that extend into the outer sealing groove (7) can fit against the outer push ring (61). 71) The end face of the ball (2) touches the ball. The ends of the multiple limiting rods (64) that extend into the outer sealing groove (7) are provided with sliding slopes (65) that can slide relative to the inclined hole wall of the through hole (51). By sliding the sliding slopes (65) relative to the inclined hole wall of the through hole (51), the outer sealing groove (7) is removed, so that the outer push ring (71) drives the outer soft sealing ring (73) to fit against the ball (2) under the action of the outer spring (72).

2. The soft-seal pneumatic ball valve according to claim 1, characterized in that: The inner push ring (61) and the outer push ring (71) are respectively provided with positioning pins (8) that can pass through the inner spring (62) and the outer spring (72).

3. A soft-seal pneumatic ball valve according to claim 1 or 2, characterized in that: The bottom of the inner sealing groove (6) and the outer sealing groove (7) are respectively provided with positioning grooves (9) for one end of the inner spring (62) and the outer spring (72) to extend into.

Images