Pressure balance self-adaptive sealing ball valve

Abstract

The utility model relates to the technical field of ball valves, in particular to a pressure balance self-adaption sealing ball valve which comprises a valve body. A transmission block is in coaxial key connection with the sealing block located at the bottom, penetrates through the bottom of the valve rod and is matched with the transmission groove in an inserted mode. On one hand, under the synchronous fixing effect of the transmission block and the limiting bolt on the valve element, stable installation and fixation of the valve element can be achieved, when the pressure at the two ends of the valve element is inconsistent, the situation that the valve element generates relative displacement cannot occur, and therefore excessive extrusion of the valve element on a sealing piece on one side is avoided, and the sealing performance of the ball valve is guaranteed; on the other hand, when the valve element needs to be detached, the limiting bolt is rotated to enable the connecting rod and the transmission block to move upwards, the transmission block can be separated from the transmission groove, limitation of the transmission block to the valve element is relieved, and then the valve element can be conveniently taken out of the valve body; by means of the design, the valve element can be conveniently and rapidly disassembled and assembled, and the installation stability of the valve element can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a pressure-balanced self-adaptive sealing ball valve. Background Art

[0002] A ball valve is a valve installed on a pipeline. It is driven by a valve stem and rotates around the axis of the ball valve. The ball valve is mainly used to cut off, distribute and change the flow direction of fluids. There is a through hole in the middle of the ball of the ball valve. When the ball rotates 90°, the through hole coincides with or is perpendicular to the axis of the pipeline, thereby opening or closing the fluid.

[0003] The utility model patent with authorization announcement number CN217130389U discloses a pressure-balanced fully welded ball valve, which includes a valve body and a driving device, a driving device is arranged at the top of the valve body, a water inlet flange interface is installed at one end of the valve body, a water outlet flange interface is installed at the other end of the valve body, a pressure relief device is installed on one side of the valve body, a first connecting pipe is embedded and installed at one end of the pressure relief device, the other end of the first connecting pipe is communicated with the water inlet flange interface, a second connecting pipe is embedded and installed at the other end of the pressure relief device, one end of the second connecting pipe is communicated with the water outlet flange interface, a valve core is movably inserted inside the valve body, a valve stem is fixedly installed at the top of the valve core, and the top end of the valve stem passes through the valve body and is sleeved inside the driving device. This pressure-balanced fully welded ball valve is installed with a pressure relief device, and the pressure relief device is connected to the water inlet and water outlet of the valve body by using the first connecting pipe and the second connecting pipe, so that when the internal pressure of the water inlet pipe is too high, the pressure enters the interior of the pressure relief device through the first connecting pipe, and through the coordinated use of the spring, the first mounting seat, the second mounting seat, the sealing gasket and the piston, when the internal pressure value of the pressure relief device is large, the piston is lifted up, so that the first mounting seat overcomes the elastic force of the spring and rises together, when the height of the piston is higher than the height of the second connecting pipe, the pressure enters the water outlet of the valve body through the second connecting pipe, and the pressure value is released, when the pressure value is less than the elastic force of the spring, the piston is reset by the elasticity of the spring, so that the medium will not enter the second connecting pipe, and the pressure is released, so that the user can turn the valve core to control the opening and closing of the ball valve.

[0004] Although the pressure-balanced fully welded ball valve has the effect of improving the internal pressure balance of the ball valve, the device still has the following problems in actual use: the top of the valve core in the device is directly fixedly connected to the valve stem, and the common structure between the valve core and the valve stem is plug-in fixation, that is, a slot is provided at the top of the valve core, and a plug-in block plugged into the slot is provided at the bottom of the valve stem. Although this design is convenient for assembling the valve core, when the pressure at both ends of the valve core is inconsistent, the plug-in structure of the plug-in block and the slot will cause relative displacement between the plug-in block and the slot, that is, under the push of pressure, the valve core will generate more extrusion force on the seal on the other side in the low-pressure zone, and under this extrusion force, the seal in the low-pressure zone on the other side will be more severely worn, thereby affecting the overall sealing of the ball valve. Therefore, the installation method of the valve core has certain limitations. In view of this, we propose a pressure-balanced adaptive sealing ball valve. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one purpose of the utility model is to provide a pressure-balanced adaptive sealing ball valve, which can achieve stable installation and fixation of the valve core by synchronously fixing the valve core with a transmission block and a limit bolt, thereby ensuring the sealing of the ball valve.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A pressure-balanced adaptive sealing ball valve comprises a valve body, a pressure relief device is arranged at the rear side of the valve body, connecting pipes are installed at the left and right sides of the valve body, and a pipe body is arranged between the pressure relief device and the connecting pipe;

[0008] The bottom of the valve body is threadedly connected with a mounting bolt, a valve core is rotatably mounted in the inner cavity of the valve body, a plug hole is provided at the bottom of the valve core, and the top end of the mounting bolt is inserted into the plug hole and rotatably connected with the plug hole, a flow hole is provided on the outer wall of the valve core, and a transmission groove is provided on the top of the valve core;

[0009] A sealing seat is fixed on the top of the valve body, and a cavity connected to the inner cavity of the valve body is opened on the top of the sealing seat; a valve stem is installed in the cavity, and a connecting plate is fixed on the bottom of the valve stem, and the connecting plate is pressed against the top of the valve core; a concave hole is opened on the top of the valve stem, and a connecting cavity is opened below the concave hole, and a connecting ring is fixed in the connecting cavity; the inner bottom of the concave hole is threadedly connected with a limit bolt; a connecting rod is slidably installed at the through hole of the connecting ring, and a spring is sleeved on the connecting rod; sealing blocks are coaxially fixed at the upper and lower ends of the connecting rod, and the sealing block is slidably connected to the connecting cavity, and the upper and lower ends of the spring are respectively pressed against the sealing block and the connecting ring; the bottom end of the limit bolt penetrates into the connecting cavity and presses against the sealing block at the top; a transmission block is coaxially keyed at the sealing block at the bottom, and the transmission block passes through the bottom of the valve stem and is plugged into the transmission groove.

[0010] In addition, the pressure-balanced adaptive sealing ball valve proposed in the application may also have the following additional technical features:

[0011] Specifically, a plurality of key slots are provided at the top end of the outer wall of the valve stem, and the valve stem and the connecting plate are an integrally formed structure.

[0012] Specifically, the cross-sectional shape of the transmission groove is a regular hexagon, and the cross-sectional shape of the transmission block is a regular hexagon.

[0013] Specifically, a sealing member is provided at the connection between the connecting pipe and the valve body, and the outer wall of the valve core is pressed against the sealing member.

[0014] Specifically, a rotation groove is provided on the top of the limiting bolt, and the cross-sectional shape of the rotation groove is a regular hexagon.

[0015] Specifically, the cross-sectional shape of the sealing block is circular, and the size of the sealing block is matched with the size of the connecting cavity.

[0016] Specifically, the overall shape of the valve stem is cylindrical, and the size of the valve stem is matched with the size of the cavity.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] By setting the transmission block and transmission groove, etc.: on the one hand, under the synchronous fixing action of the transmission block and the limit bolt on the valve core, the stable installation and fixation of the valve core can be achieved. When the pressures at both ends of the valve core are inconsistent, the valve core will not produce relative displacement, thereby avoiding excessive squeezing of the valve core on one side of the seal, thereby ensuring the sealing of the ball valve; on the other hand, when the valve core needs to be removed, the limit bolt is turned to make the connecting rod and the transmission block move upward, so that the transmission block can be disengaged from the transmission groove, and the restriction of the transmission block on the valve core is released, thereby facilitating the removal of the valve core from the valve body; this design not only facilitates the rapid disassembly and assembly of the valve core, but also ensures the stability of the valve core installation, while improving the convenience of valve core maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0021] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0022] Figure 4 This is one of the schematic diagrams of a partial explosion structure in the utility model;

[0023] Figure 5 This is a structural cross-sectional view of the valve stem in the utility model;

[0024] Figure 6 This is the second schematic diagram of the partial explosion structure in the utility model.

[0025] In the figure:

[0026] 1. Valve body; 10. Sealing seat; 11. Mounting bolt; 12. Valve core; 120. Flow hole; 121. Transmission groove; 13. Valve stem; 130. Keyway; 131. Concave hole; 132. Connecting cavity; 133. Connecting ring; 14. Limit bolt; 140. Rotation groove; 15. Sealing block; 16. Connecting rod; 17. Spring; 18. Transmission block;

[0027] 2. Connecting pipe; 20. Sealing member;

[0028] 3. Pressure relief device; 30. Pipe body. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] This embodiment provides a technical solution:

[0031] See also Figure 1-Figure 6As shown, a pressure-balanced adaptive sealing ball valve comprises a valve body 1, a pressure relief device 3 (the prior art) is provided on the rear side of the valve body 1, connecting pipes 2 are installed on the left and right sides of the valve body 1, and a pipe body 30 is provided between the pressure relief device 3 and the connecting pipe 2; a mounting bolt 11 is threadedly connected to the bottom of the valve body 1, a valve core 12 is rotatably installed in the inner cavity of the valve body 1, a plug hole is provided at the bottom of the valve core 12, and the top end of the mounting bolt 11 is inserted into the plug hole and rotatably connected to the plug hole, a flow hole 120 is provided on the outer wall of the valve core 12, and a transmission groove 121 is provided on the top of the valve core 12; a sealing seat 10 is fixed on the top of the valve body 1, and a cavity connected to the inner cavity of the valve body 1 is provided on the top of the sealing seat 10; a valve stem 13 is installed in the cavity, a connecting plate 134 is fixed to the bottom of the valve stem 13, and the connecting plate 134 abuts against Tighten the top of the valve core 12; a recessed hole 131 is provided at the top of the valve stem 13, and a connecting cavity 132 is provided below the recessed hole 131, in which a connecting ring 133 is fixed; the inner bottom of the recessed hole 131 is threadedly connected to a limiting bolt 14; a connecting rod 16 is slidably installed at the through hole of the connecting ring 133, and a spring 17 is sleeved on the connecting rod 16; sealing blocks 15 are coaxially fixed at the upper and lower ends of the connecting rod 16, and the sealing block 15 is slidably connected to the connecting cavity 132, and the upper and lower ends of the spring 17 respectively press against the sealing block 15 and the connecting ring 133; the bottom end of the limiting bolt 14 penetrates into the connecting cavity 132 and presses against the sealing block 15 at the top; the sealing block 15 at the bottom is coaxially keyed with a transmission block 18, which passes through the bottom of the valve stem 13 and is plugged into the transmission groove 121.

[0032] In this embodiment, a plurality of key slots 130 are provided at the top of the outer wall of the valve stem 13, and the valve stem 13 and the connecting plate 134 are an integrally formed structure. The key slots 130 enable the handle or the driving device to be accurately and firmly mounted on the valve stem 13; and the integrally formed structure improves the structural strength between the valve stem 13 and the connecting plate 134.

[0033] In this embodiment, the cross-sectional shape of the transmission groove 121 is a regular hexagon, and the cross-sectional shape of the transmission block 18 is a regular hexagon. This design enhances the matching accuracy and stability between the transmission groove 121 and the transmission block 18, making the transmission smoother and reducing the problem of poor rotation of the valve core 12 due to inaccurate transmission.

[0034] In this embodiment, a seal 20 is provided at the connection between the connecting pipe 2 and the valve body 1, and the outer wall of the valve core 12 is pressed against the seal 20. The seal 20 effectively prevents leakage of the fluid at the connection and improves the sealing performance of the valve core 12.

[0035] In this embodiment, a rotation groove 140 is formed on the top of the limit bolt 14, and the cross-sectional shape of the rotation groove 140 is a regular hexagon. This design facilitates the use of special tools for tightening or loosening operations, thereby improving the convenience of operation.

[0036] In this embodiment, the cross-sectional shape of the sealing block 15 is circular, and the size of the sealing block 15 is adapted to the size of the connecting cavity 132. This design ensures that the sealing block 15 can be tightly filled in the connecting cavity 132 to form an effective sealing effect.

[0037] In this embodiment, the overall shape of the valve stem 13 is cylindrical, and the size of the valve stem 13 is adapted to the size of the cavity. This design facilitates the smooth rotation of the valve stem 13 in the cavity, while ensuring the stability and sealing of the valve stem 13 in the cavity.

[0038] It should be added that the connecting pipe 2 and the valve body 1 in this embodiment are fixedly connected by a flange and multiple bolts. This connection method has the advantages of secure installation and easy disassembly and assembly, ensuring the installation stability of the connecting pipe 2 and the valve body 1 and the stability of the use of the ball valve.

[0039] When the valve core 12 needs to be removed, the user first inserts the wrench into the rotating groove 140 and rotates it, the limit bolt 14 rotates and moves upward, and at the same time, under the elastic action of the spring 17, the sealing block 15 and the connecting rod 16 move upward, and the connecting rod 16 drives the transmission block 18 to move upward at the same time, and the bottom end of the transmission block 18 disengages from the transmission groove 121, and the restriction of the transmission block 18 on the valve core 12 is released. Then the user loosens the mounting bolt 11, and the top of the mounting bolt 11 disengages from the valve core 12, and the restriction of the mounting bolt 11 on the valve core 12 is released. Finally, the user can take out the valve core 12.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A pressure-balanced adaptive sealing ball valve, comprising a valve body (1), a pressure relief device (3) being provided at the rear side of the valve body (1), connecting pipes (2) being installed at the left and right sides of the valve body (1), and a pipe body (30) being provided between the pressure relief device (3) and the connecting pipe (2), characterized in that: The bottom of the valve body (1) is threadedly connected with a mounting bolt (11), a valve core (12) is rotatably mounted in the inner cavity of the valve body (1), a plug hole is provided at the bottom of the valve core (12), and the top end of the mounting bolt (11) is inserted into the plug hole and rotatably connected to the plug hole, a flow hole (120) is provided on the outer wall of the valve core (12), and a transmission groove (121) is provided at the top of the valve core (12); A sealing seat (10) is fixed on the top of the valve body (1), and a cavity communicating with the inner cavity of the valve body (1) is formed on the top of the sealing seat (10); a valve stem (13) is installed in the cavity, and a connecting plate (134) is fixed on the bottom of the valve stem (13), and the connecting plate (134) is pressed against the top of the valve core (12); a concave hole (131) is formed on the top of the valve stem (13), and a connecting cavity (132) is formed below the concave hole (131), and a connecting ring (133) is fixed in the connecting cavity (132); the inner bottom of the concave hole (131) is threadedly connected to a limiting bolt (14); the through hole of the connecting ring (133) is slidably connected to the inner bottom of the concave hole (131); ... A connecting rod (16) is movably installed, and a spring (17) is sleeved on the connecting rod (16); sealing blocks (15) are coaxially fixed at both upper and lower ends of the connecting rod (16), and the sealing block (15) is slidably connected to the connecting cavity (132), and the upper and lower ends of the spring (17) respectively press against the sealing block (15) and the connecting ring (133); the bottom end of the limiting bolt (14) penetrates into the connecting cavity (132) and presses against the sealing block (15) at the top; a transmission block (18) is coaxially keyed at the sealing block (15) at the bottom, and the transmission block (18) passes through the bottom of the valve stem (13) and is plugged into the transmission groove (121).

2. The pressure-balanced adaptive sealing ball valve according to claim 1, characterized in that: A plurality of key grooves (130) are provided at the top end of the outer wall of the valve stem (13), and the valve stem (13) and the connecting plate (134) are an integrally formed structure.

3. The pressure-balanced adaptive sealing ball valve according to claim 1, characterized in that: The cross-sectional shape of the transmission groove (121) is a regular hexagon, and the cross-sectional shape of the transmission block (18) is a regular hexagon.

4. The pressure-balanced adaptive sealing ball valve according to claim 1, characterized in that: A sealing member (20) is provided at the connection between the connecting pipe (2) and the valve body (1), and the outer wall of the valve core (12) is pressed against the sealing member (20).

5. The pressure-balanced adaptive sealing ball valve according to claim 1, characterized in that: A rotation groove (140) is provided at the top of the limiting bolt (14), and the cross-sectional shape of the rotation groove (140) is a regular hexagon.

6. The pressure-balanced adaptive sealing ball valve according to claim 1, characterized in that: The cross-sectional shape of the sealing block (15) is circular, and the size of the sealing block (15) is compatible with the size of the connecting cavity (132).

7. The pressure-balanced adaptive sealing ball valve according to claim 1, characterized in that: The overall shape of the valve stem (13) is cylindrical, and the size of the valve stem (13) is compatible with the size of the cavity.

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