PE ball valve with main valve and balance valve opened and closed in linkage mode

Abstract

The PE ball valve comprises a main valve and two bleeding pipes on the two sides of the main valve, the bleeding valves are arranged on the upper portions of the bleeding pipes, a communicating pipe is communicated between the two bleeding pipes, the balance valve is arranged on the communicating pipe, and an opening and closing mechanism for controlling the main valve and the balance valve is arranged on the main valve. The communicating pipe and the balance valve are arranged between the two diffusion pipes, before the main valve is opened, the balance valve on the side edge of the main valve is opened through the opening and closing mechanism, the two diffusion pipes are communicated, high-pressure gas in a pipeline enters the other side of the main valve through the communicating pipe and the diffusion pipes, the pressure difference between the two sides of the main valve is reduced, and the deformation degree of a PP ball of the main valve is reduced; the opening difficulty of the main valve is reduced, and damage caused by violent opening of the main valve is avoided.

Description

Technical Field

[0001] The present invention relates to the field of PE ball valves for gas discharge, and in particular to a PE ball valve with a main valve - balance valve linkage opening and closing structure. Background Art

[0002] PE ball valves are important components in gas PE pipeline systems. According to their classification, there are standard type and double - gas - discharge type valves. The gas - discharge type has gas - discharge pipes welded to both the left and right ends of the valve, which are used to evacuate the gas in the pipeline after the valve is closed. The gas - discharge pipes are located on the end pipes of the valve.

[0003] Currently, most of the valves used in gas pipelines are double - gas - discharge PE ball valves. The ball valve has a symmetrical structure and is mostly a floating ball valve (that is, after the ball valve is closed, the ball moves left and right under the pressure of unilateral air pressure to achieve back - sealing). The ball is commonly made of PP material.

[0004] When the specification of the ball valve is ≥dn315mm, after the valve is closed for a long time, due to the pressure of unilateral air pressure, the PP ball will deform, resulting in an excessive opening torque and the situation where the ball valve cannot be opened smoothly (the longer the placement time, the greater the torque). If a violent opening solution is adopted to increase the torque, it may cause damage to the ball valve and make it unable to open. Summary of the Invention

[0005] The purpose of the present invention is to avoid the deficiencies of the prior art and provide a PE ball valve with a main valve - balance valve linkage opening and closing structure, thereby effectively solving the deficiencies existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a PE ball valve with a main valve - balance valve linkage opening and closing structure, including a main valve and two gas - discharge pipes on both sides of the main valve. Gas - discharge valves are provided at the upper parts of the gas - discharge pipes. A connecting pipe is connected between the two gas - discharge pipes, and a balance valve is provided on the connecting pipe. An opening and closing mechanism for controlling the opening and closing of the main valve and the balance valve is provided on the main valve.

[0007] Further, both the main valve and the balance valve are ball valves. A main linkage shaft is provided upward on the main valve, and a balance linkage shaft is provided upward on the balance valve. The opening and closing mechanism includes a linkage box. A rotating seat is provided in the linkage box. A main gear disk is provided on the upper layer of the rotating seat. A swing rod is eccentrically provided on the main gear disk. Main swing plates and balance swing plates are respectively provided on both sides of the swing rod on the rotating seat. The main swing plate is linked with the main linkage shaft, and the balance swing plate is linked with the balance linkage shaft. A main swing groove is provided on the main swing plate to cooperate with the swing rod, and a balance swing groove is provided on the balance swing plate to cooperate with the swing rod.

[0008] Further, the swing rod is provided in the middle layer of the rotating seat. Support disks are respectively provided on the upper and lower sides of the swing rod. The support disks rotate coaxially with the main gear disk. The main swing groove and the balance swing groove are both provided between the support disks.

[0009] Further, a disc-shaped limiting disc is coaxially arranged on the transposition seat. On both sides of the main swing plate in the main swing groove, main limiting edges attached to the arc surface of the limiting disc are provided. On both sides of the balance swing plate in the balance swing groove, balance limiting edges attached to the arc surface of the limiting disc are provided. On one side of the limiting disc close to the swing rod, an avoidance groove is provided.

[0010] Further, the angle by which the main swing groove swings following the swing rod is 90°. The angle by which the balance swing groove swings following the swing rod is 90°. A main angle-changing gear is arranged on the main swing plate. A main linkage gear is arranged on the main linkage shaft in cooperation with the main angle-changing gear. A balance angle-changing gear is arranged on the balance swing plate. A balance linkage gear is arranged on the balance linkage shaft in cooperation with the balance angle-changing gear.

[0011] Further, the number of teeth of both the main angle-changing gear and the balance angle-changing gear is 30. The number of teeth of both the main linkage gear and the balance linkage gear is 31.

[0012] Further, a driving gear linked with the main gear disc is arranged on the transposition seat, and the number of teeth of the driving gear is less than that of the main gear disc.

[0013] Further, a reversing gear is arranged on the transposition seat between the main gear disc and the driving gear, and the reversing gear meshes with the driving gear and the main gear disc respectively.

[0014] Further, a rotating handle extending out of the outside of the linkage box is arranged on the driving gear.

[0015] The above technical solution of the present invention has the following beneficial effects: A communicating pipe and a balance valve are arranged between the two blow-off pipes in the present invention. Before opening the main valve, the balance valve on the side of the main valve is first opened through the opening and closing mechanism to communicate the two blow-off pipes. The high-pressure gas in the pipeline enters the other side of the main valve through the communicating pipe and the blow-off pipe, reducing the pressure difference on both sides of the main valve, reducing the deformation degree of the PP sphere of the main valve, reducing the difficulty of opening the main valve, and avoiding the situation of damage caused by violently opening the main valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of an embodiment of the present invention;

[0017] Figure 2 is a three-dimensional schematic diagram inside the linkage box of an embodiment of the present invention;

[0018] Figure 3 is a three-dimensional exploded schematic diagram inside the linkage box of an embodiment of the present invention;

[0019] Figure 4 is an interface schematic diagram of the swing rod cooperating with the main swing plate and the balance swing plate of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following is a preferred and detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0021] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "rear end", "front end", "head", "tail", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] As Figures 1-4 shown, a PE ball valve with a main valve - balance valve linkage opening and closing in this embodiment includes a main valve 1 and two blow - off pipes 2 on both sides of the main valve 1. Blow - off valves 3 are arranged on the upper parts of the blow - off pipes 2. A connecting pipe 4 is connected between the two blow - off pipes 2. A balance valve 5 is arranged on the connecting pipe 4. An opening and closing mechanism 6 for controlling the opening and closing of the main valve 1 and the balance valve 5 is arranged on the main valve 1; before opening the main valve 1, the balance valve 5 on the side of the main valve 1 is first opened through the opening and closing mechanism 6 to connect the two blow - off pipes 2. The high - pressure gas in the pipeline enters the other side of the main valve 1 through the connecting pipe 4 and the blow - off pipes 2, reducing the pressure difference between the two sides of the main valve 1, reducing the deformation degree of the PP sphere of the main valve 1, reducing the difficulty of opening the main valve 1, and avoiding the situation of damage caused by violently opening the main valve 1;

[0023] Preferably, both the main valve 1 and the balance valve 5 are ball valves. A main linkage shaft 7 is arranged upward on the main valve 1, and a balance linkage shaft 8 is arranged upward on the balance valve 5. The opening and closing mechanism 6 includes a linkage box 9. A rotating seat 10 is arranged in the linkage box 9. A main gear disc 11 is arranged on the upper layer of the rotating seat 10. A swing rod 12 is eccentrically arranged on the main gear disc 11. On both sides of the swing rod 12 on the rotating seat 10, a main swing plate 13 and a balance swing plate 14 are respectively arranged. The main swing plate 13 is linked with the main linkage shaft 7, and the balance swing plate 14 is linked with the balance linkage shaft 8. A main swing groove 15 is arranged on the main swing plate 13 to cooperate with the swing rod 12, and a balance swing groove 16 is arranged on the balance swing plate 14 to cooperate with the swing rod 12. In the linkage box 9, the main gear disc 11 is a component that rotates actively. The rotation of the main gear disc 11 can drive the circumferential rotation of the swing rod 12. During the rotation of the swing rod 12, it can cooperate with the main swing groove 15 and the balance swing groove 16 respectively. In this embodiment, the main swing groove 15 and the balance swing groove 16 are respectively arranged on both sides of the main gear disc 11. When the swing rod 12 swings out from the main swing groove 15 and continues to rotate, it can enter the balance swing groove 16 to drive the balance swing plate 14 to rotate. Similarly, when the swing rod 12 rotates reversely and swings out from the balance swing groove 16 and continues to rotate, it can enter the main swing groove 15 to drive the main swing plate 13 to rotate.

[0024] Thus, the following process can be realized:

[0025] Opening the valve: After rotating the main gear disc 11, the swing rod 12 first enters the balance swing groove 16 to drive the balance swing plate 14 to rotate. The balance swing plate 14 drives the balance linkage shaft 8 to rotate, thereby opening the ball valve of the balance valve 5 (the high-pressure gas in the pipeline enters the other side of the main valve 1 through the connecting pipe 4 and the relief pipe 2, reducing the pressure difference on both sides of the main valve 1 and reducing the torque required to open the main valve 1). Then the swing rod 12 disengages from the balance swing groove 16. Continuing to rotate the main gear disc 11, the swing rod 12 enters the main swing groove 15 to drive the main swing plate 13 to rotate. The main swing plate 13 drives the main linkage shaft 7 to rotate, thereby opening the main valve 1. At this time, the swing rod 12 is at a position where it has disengaged or is about to disengage from the main swing groove 15.

[0026] Closing the valve: Rotating the main gear disc 11 reversely, the swing rod 12 enters the main swing groove 15 to drive the main swing plate 13 to rotate reversely. The main swing plate 13 drives the main linkage shaft 7 to rotate reversely to close the main valve 1 (the two sides of the pipeline are connected through the connecting pipe 4 and the relief pipe 2, and the pressure difference on both sides of the main valve 1 is not large, and the torque required to close the main valve 1 is relatively low). Then the swing rod 12 disengages from the main swing groove 15. Continuing to rotate the main gear disc 11 reversely, the swing rod 12 enters the balance swing groove 16 to drive the balance swing plate 14 to rotate reversely. The balance swing plate 14 drives the balance linkage shaft 8 to rotate reversely, thereby closing the balance valve 5. At this time, the swing rod 12 is at a position where it has disengaged or is about to disengage from the balance swing groove 16.

[0027] Preferably, the swing rod 12 is arranged in the middle layer of the turntable 10. Support disks 17 are respectively arranged on the upper and lower sides of the swing rod 12. The support disks 17 rotate coaxially with the main gear disk 11. The main swing groove 15 and the balance swing groove 16 are both arranged between the support disks 17. The swing rod 12 is connected to the main gear disk 11 through the support disks 17. The support disks 17 limit the swinging directions of the main swing groove 15 and the balance swing groove 16, preventing the main swing plate 13 and the balance swing plate 14 from tilting and increasing the torque resistance.

[0028] Preferably, a disk-shaped limit disk 18 is coaxially arranged on the turntable 10. Main limit edges 19 that are attached to the arc surface of the limit disk 18 are respectively arranged on both sides of the main swing groove 15 on the main swing plate 13. Balance limit edges 20 that are attached to the arc surface of the limit disk 18 are respectively arranged on both sides of the balance swing groove 16 on the balance swing plate 14. An avoidance groove 21 is arranged on one side of the limit disk 18 close to the swing rod 12. When the swing rod 12 cooperates with the main swing groove 15 of the main swing plate 13, the positions of both sides of the main swing groove 15 correspond to the avoidance groove 21. The avoidance groove 21 can allow the main swing plate 13 to rotate normally. At the same time, the outer circular part of the limit disk 18 is in contact with the balance limit edges 20, and the balance swing plate 14 is restricted from swinging. It can be realized that when the main valve 1 is opened and closed (when the swing rod 12 is not cooperating with the balance swing groove 16), the balance valve 5 remains in the current state. Similarly, when the swing rod 12 cooperates with the balance swing groove 16 of the balance swing plate 14, the positions of both sides of the balance swing groove 16 correspond to the avoidance groove 21. The avoidance groove 21 can allow the balance swing plate 14 to rotate normally. At the same time, the outer circular part of the limit disk 18 is in contact with the main limit edges 19, and the main swing plate 13 is restricted from swinging. It can be realized that when the balance valve 5 is opened and closed (when the swing rod 12 is not cooperating with the main swing groove 15), the main valve 1 remains in the current state. Thus, it can be realized that only one main gear disk 11 drives the main valve 1 and the balance valve 5 to be intermittently opened and closed in the order required by the pipeline, without mutual influence, and the operation is more convenient.

[0029] Preferably, the angle by which the main swing groove 15 swings following the swing rod 12 is 90° (i.e., during the process from the swing rod 12 rotating into the main swing groove 15 to the swing rod 12 rotating out of the main swing groove 15, the swing angle of the main swing plate 13 is 90°), and the angle by which the balance swing groove 16 swings following the swing rod 12 is 90° (i.e., during the process from the swing rod 12 rotating into the balance swing groove 16 to the swing rod 12 rotating out of the balance swing groove 16, the swing angle of the balance swing plate 14 is 90°). A main angle-changing gear 22 is provided on the main swing plate 13, a main linkage gear 23 is provided on the main linkage shaft 7 in cooperation with the main angle-changing gear 22, a balance angle-changing gear 24 is provided on the balance swing plate 14, and a balance linkage gear 25 is provided on the balance linkage shaft 8 in cooperation with the balance angle-changing gear 24. In this embodiment, the main angle-changing gear 22, the main linkage gear 23, the balance angle-changing gear 24, and the balance linkage gear 25 are all arranged on the lower layer of the turntable 10; the main swing plate 13 drives the main linkage shaft 7 to rotate through the cooperation of the main angle-changing gear 22 and the main linkage gear 23. The number of teeth of the main angle-changing gear 22 is less than that of the main linkage gear 23 (the opening and closing of the valve is a 90° rotation of the sphere, but since the PE ball valve is assembled with multiple parts and there are assembly clearances in each part), so the rotation angle output to the main linkage shaft 7 needs to be increased to ensure the 90° rotation of the main valve 1 ball valve; similarly, the number of teeth of the balance angle-changing gear 24 is less than that of the balance linkage gear 25, and the rotation angle output to the balance linkage shaft 8 is increased to ensure the 90° rotation of the balance valve 5 ball valve;

[0030] Preferably, the number of teeth of both the main angle-changing gear 22 and the balance angle-changing gear 24 is 30, and the number of teeth of both the main linkage gear 23 and the balance linkage gear 25 is 31. When the main swing plate 13 and the balance swing plate 14 rotate 90°, it can output a 93° rotation to the main linkage shaft 7 and the balance linkage shaft 8;

[0031] Preferably, a driving gear 26 linked to the main gear disc 11 is provided on the turntable 10, and the number of teeth of the driving gear 26 is less than that of the main gear disc 11; in this embodiment, the number of teeth of the driving gear 26 is half of the number of teeth of the main gear disc 11. Rotating the driving gear 26 to control the main gear disc 11 can achieve the effect of reducing force;

[0032] Preferably, a reversing gear 27 is provided on the turntable 10 between the main gear disc 11 and the driving gear 26, and the reversing gear 27 meshes with the driving gear 26 and the main gear disc 11 respectively; the rotation directions of the reversing gear 27, the main gear disc 11, and the driving gear 26 are the same;

[0033] Preferably, a rotating handle 28 extending outside the linkage box 9 is provided on the driving gear 26, and the rotation of the driving gear 26 can be controlled through the rotating handle 28.

[0034] The embodiments of the present invention are provided by way of example and description, and are not exhaustive or limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the present invention and its practical application, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A PE ball valve with a main valve - balance valve linkage for opening and closing, characterized in that: It includes a main valve and two blow-off pipes on both sides of the main valve. Blow-off valves are provided at the upper parts of the blow-off pipes. A connecting pipe is connected between the two blow-off pipes, and a balance valve is provided on the connecting pipe. An opening and closing mechanism for controlling the main valve and the balance valve is provided on the main valve.

2. The PE ball valve with the main valve and the balance valve linked for opening and closing according to claim 1, wherein: Both the main valve and the balance valve are ball valves. A main linkage shaft is provided upward on the main valve, and a balance linkage shaft is provided upward on the balance valve. The opening and closing mechanism includes a linkage box. A rotating seat is provided in the linkage box. A main gear disk is provided on the upper layer of the rotating seat. A swing rod is eccentrically provided on the main gear disk. On both sides of the swing rod on the rotating seat, a main swing plate and a balance swing plate are respectively provided. The main swing plate is linked with the main linkage shaft, and the balance swing plate is linked with the balance linkage shaft. A main swing groove is provided on the main swing plate to cooperate with the swing rod, and a balance swing groove is provided on the balance swing plate to cooperate with the swing rod.

3. A PE ball valve with main valve-balance valve linkage opening and closing according to claim 2, characterized in that: The swing rod is provided in the middle layer of the rotating seat. Support disks are respectively provided on the upper and lower sides of the swing rod. The support disks rotate coaxially with the main gear disk. The main swing groove and the balance swing groove are both provided between the support disks.

4. A PE ball valve with main valve-balance valve linkage opening and closing according to claim 2, characterized in that: A disk-shaped limit disk is coaxially provided on the rotating seat. Main limit edges attached to the arc surface of the limit disk are respectively provided on both sides of the main swing groove on the main swing plate. Balance limit edges attached to the arc surface of the limit disk are respectively provided on both sides of the balance swing groove on the balance swing plate. An avoidance groove is provided on one side of the limit disk close to the swing rod.

5. The PE ball valve with linkage opening and closing of the main valve and the balance valve according to claim 4, wherein: The angle of swing of the main swing groove following the swing rod is 90°, and the angle of swing of the balance swing groove following the swing rod is 90°. A main angle-changing gear is provided on the main swing plate. A main linkage gear is provided on the main linkage shaft to cooperate with the main angle-changing gear. A balance angle-changing gear is provided on the balance swing plate. A balance linkage gear is provided on the balance linkage shaft to cooperate with the balance angle-changing gear.

6. The PE ball valve with linkage opening and closing of the main valve and the balance valve according to claim 5, characterized in that: The number of teeth of both the main angle-changing gear and the balance angle-changing gear is 30, and the number of teeth of both the main linkage gear and the balance linkage gear is 31.

7. The PE ball valve with the main valve and the balance valve linked for opening and closing according to claim 2, wherein: A driving gear linked with the main gear disk is provided on the rotating seat, and the number of teeth of the driving gear is less than that of the main gear disk.

8. A PE ball valve with main valve-balance valve linkage opening and closing according to claim 7, characterized in that: A reversing gear is provided between the main gear disk and the driving gear on the rotating seat, and the reversing gear meshes with the driving gear and the main gear disk respectively.

9. A PE ball valve with a main valve - balance valve linkage opening and closing according to claim 7, characterized in that: A rotating handle extending outside the linkage box is provided on the driving gear.

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