Leakage-proof ball valve

Abstract

The invention discloses an anti-leakage ball valve, which belongs to the technical field of ball valves, and comprises a valve body, a valve rod and a valve core, the valve body is provided with a valve rod hole for the valve rod to pass through, one end of the valve rod extending into the valve body is connected to the valve core, a channel matched with the valve core is formed on the inner side of the valve body, and a left sealing ring and a right sealing ring are arranged in the channel. The left sealing ring and the right sealing ring are located on the left and right sides of the valve element respectively. The center of the valve rod is connected with a center rod, the center rod penetrates through the bottom of the valve element and then is coaxially connected to a first connector rod, the first connector rod is connected with a second connector rod through two connecting rod assemblies, the two connecting rod assemblies are identical in structure and parallel to each other, and the second connector rod is slidably installed in the installation base in the axial direction of the center rod. The second joint rod is connected with the mounting seat through an elastic connecting device, and the mounting seat is rotationally mounted in the base. According to the ball valve, when the valve rod is stressed to deflect, a response can be made in time, so that the ball valve is protected, and leakage is prevented.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ball valves, and particularly relates to a leakage-proof ball valve. BACKGROUND

[0002] As a common opening and closing control element, the ball valve is widely used in petroleum, chemical industry, power plant, urban water supply and drainage and other fluid conveying pipeline systems due to its small fluid resistance, rapid opening and closing, reliable sealing and other advantages. The core working principle is that a ball with a channel in the middle is used as a valve core, which rotates around its own axis in the valve body to realize the flow or block of medium. In actual operation, if the valve stem is forced to rotate when it is deflected, the contact pressure distribution between the valve stem and the surrounding sealing ring or packing will be seriously uneven, the sealing surface on the deflected side may be accelerated wear or plastic deformation due to excessive extrusion, and the opposite side may leak due to reduced contact pressure or even gap, thereby reducing the service life of the device. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a leakage-proof ball valve which can respond in time when the valve stem is deflected under force, thereby protecting the ball valve and preventing leakage.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: The leakage-proof ball valve disclosed by the present application comprises a valve body, a valve stem and a valve core. A valve stem hole is formed in the valve body for the valve stem to pass through. The valve stem extends into the valve body and is connected to the valve core at one end. A channel is formed on the inner side of the valve body and cooperates with the valve core. A left sealing ring and a right sealing ring are installed in the channel and are located on the left and right sides of the valve core, respectively. A center rod is connected to the center of the valve stem. The center rod passes through the bottom of the valve core and is coaxially connected to a first joint rod. The first joint rod is connected to a second joint rod through two groups of link rod assemblies. The two groups of link rod assemblies are identical in structure and are arranged in parallel. The second joint rod is slidably installed in a mounting seat along the axial direction of the center rod. The second joint rod is connected to the mounting seat through an elastic connecting device. The mounting seat is rotatably installed in a base, and the base is fixed to the inner bottom of the valve body.

[0005] Further, an open slot for installing the link rod assembly is formed in the first joint rod and the second joint rod. The link rod assembly comprises a first pin shaft, a first link rod, a second pin shaft, a second link rod and a third pin shaft. The first pin shaft is fixedly connected in the open slot formed in the first joint rod. The first pin shaft is hingedly connected to one end of the first link rod. The other end of the first link rod is hingedly connected to one end of the second link rod through the second pin shaft. The other end of the second link rod is hingedly connected to the third pin shaft. The third pin shaft is fixedly connected in the open slot formed in the second joint rod.

[0006] Furthermore, a threaded hole is provided at the lower end of the center rod, and the first connector rod is detachably connected to the center rod through the threaded hole. By rotating the first connector rod, the length of the first connector rod extending out of the threaded hole can be adjusted.

[0007] Furthermore, a flange is fixedly connected to the upper end of the central rod, and the central hole of the flange is detachably connected to the central rod. The upper end of the valve stem forms a flange platform that mates with the flange.

[0008] Furthermore, the valve body includes a left valve body and a right valve body. The right end face of the left valve body forms a mounting hole that mates with the right valve body. The right valve body presses the right sealing ring against the valve core, and the valve core presses the left sealing ring against the limiting end face formed inside the left valve body.

[0009] Furthermore, a hydraulic channel is provided on the inner side of the left valve body, and the right end face of the left valve body forms the first channel opening of the hydraulic channel. A first piston is slidably sealed and installed in the first channel opening. The first piston is connected to the left valve body through a first elastic support member, and the outer end of the first piston contacts the left end face of the right valve body. The limiting end face of the left valve body forms the second channel opening of the hydraulic channel, and a second piston is slidably sealed and installed in the second channel opening. The second piston is connected to the left valve body through a second elastic support member, and the outer end of the second piston contacts the left end face of the left sealing ring.

[0010] Furthermore, the first elastic support and the second elastic support have the same structure. The first elastic support includes a slider and a support spring. The slider is fixed to the outside of the first piston. A groove for sliding the slider is opened on the inside of the hydraulic channel. The two ends of the support spring are connected to the slider and the left valve body, respectively.

[0011] Furthermore, the left end of the left valve body is detachably connected to the end valve body, the right end face of the end valve body has a right groove, the left end face of the left valve body has a left groove, and the left groove and the right groove together form part of the hydraulic channel.

[0012] The beneficial effects of this invention are as follows: This invention discloses a leak-proof ball valve. By designing a central rod at the center of the valve stem, when the first and second connecting rods are coaxial, the valve stem rotates normally, allowing the ball valve to operate normally. When the valve stem deflects, the first and second connecting rods of the central rod deflect at the connecting rod assembly and are axially misaligned, preventing the valve stem from rotating and thus preventing the normal opening and closing of the ball valve. This passively allows the operator to react promptly, thereby protecting the ball valve and preventing leakage. Attached Figure Description

[0013] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Magnification at point B; Figure 4 for Figure 1 Enlarged view at point C; Figure 5 This is a schematic diagram of the linkage assembly. Figure 6 This is a schematic diagram of the valve core.

[0014] The following components are labeled in the attached diagram: Valve body 1, Valve stem 2, Valve core 3, Valve hole 4, Channel 5, Left sealing ring 6, Right sealing ring 7, Center rod 8, First connector rod 9, Second connector rod 10, Mounting seat 11, Elastic connecting device 12, Base 13, Opening groove 14, First pin 15, First connecting rod 16, Second pin 17, Second connecting rod 18, Third pin 19, Threaded hole 20, Flange 21, Flange platform 22, Left valve body 23, Right valve body 24, Mounting hole 25, Hydraulic channel 26, First channel opening 27, First piston 28, Second channel opening 29, Second piston 30, Slider 31, Support spring 32, Slide groove 33, End valve body 34, Right groove 35, Left groove 36. Detailed Implementation

[0015] like Figures 1-6 As shown, the present invention discloses a leak-proof ball valve, comprising a valve body 1, a valve stem 2, and a valve core 3. The valve body 1 has a valve stem 2 hole for the valve stem 2 to pass through, and the valve stem 2 hole is perpendicular to the channel 5 of the valve body 1. One end of the valve stem 2 extends into the valve body 1 and is connected to the valve core 3. The valve core 3 is spherical in shape. The inner side of the valve body 1 forms a channel 5 that mates with the valve core 3. A left sealing ring 6 and a right sealing ring 7 are installed in the channel 5. The left sealing ring 6 and the right sealing ring 7 are located on the left and right sides of the valve core 3, respectively, and seal with the left and right sides of the valve core 3, respectively. When the valve core 3 rotates, it plays a sealing role to prevent the ball valve from leaking.

[0016] Specifically, the valve stem 2 disclosed in this invention is also connected to a central rod 8 at its center. The central rod 8 extends along the axial direction of the valve stem 2 and passes through the valve core 3. After passing through the bottom of the valve core 3, the central rod 8 is coaxially connected to the first connector rod 9. The first connector rod 9 is connected to the second connector rod 10 through two sets of connecting rod assemblies. In normal use, the first connector rod 9 and the second connector rod 10 are coaxial. The two sets of connecting rod assemblies have the same structure and are arranged parallel to each other. The second connector rod 10 is slidably installed in the mounting base 11 along the axial direction of the central rod 8. The second connector rod 10 can slide axially relative to the mounting base 11 but will not rotate relative to the mounting base 11. The second connector rod 10 and the mounting base 11 are connected by an elastic connecting device 12. The elastic connecting device 12 can be a tension spring, which can realize the reset of the position of the second connector rod 10. The mounting base 11 is rotatably installed in the base 13, and the base 13 is fixed to the inner bottom of the valve body 1.

[0017] The working principle and process of the device of the present invention are as follows: In normal use, the first connector rod 9 and the second connector rod 10 are coaxial, and the connecting rod assembly corresponds to them in the length direction. When the first connector rod 9 rotates, it can drive the second connector rod 10 to rotate normally. By designing a center rod 8 at the center of the valve rod 2, when the first connector rod 9 and the second connector rod 10 are coaxial, the valve rod 2 rotates normally, and the ball valve can operate normally to realize the opening and closing of the ball valve.

[0018] When valve stem 2 deflects, the first joint rod 9 and the second joint rod 10 of the center rod 8 deflect at the connecting rod assembly and are axially misaligned. At this time, valve stem 2 cannot rotate, preventing the normal opening and closing of the ball valve. This passively allows the operator to react in time, thereby protecting the ball valve and preventing leakage. After subsequent maintenance by personnel, the device can be used normally, and the wear and tear of key connecting parts are also avoided.

[0019] In this embodiment, the first connector rod 9 and the second connector rod 10 are provided with opening slots 14 for mounting the connecting rod assembly. The opening slots 14 can also play a certain limiting and guiding role for the connecting rod assembly, guiding its deflection direction along the opening direction of the slot 14. Taking the structure of one set of connecting rod assemblies as an example, one set of connecting rod assemblies includes a first pin 15, a first connecting rod 16, a second pin 17, a second connecting rod 18, and a third pin 19. The first pin 15 is fixedly connected in the opening slot 14 on the first connector rod 9. The first pin 15 is hinged to one end of the first connecting rod 16. The other end of the first connecting rod 16 is hinged to one end of the second connecting rod 18 through the second pin 17. The other end of the second connecting rod 18 is hinged to the third pin 19. The third pin 19 is fixedly connected in the opening slot 14 on the second connector rod 10. When the valve stem 2 deflects, the first connecting rod 16 and the second connecting rod 18 bend at the second pin 17. Since the first connecting rod 9 and the second connecting rod 10 are axially misaligned, the valve stem 2 cannot rotate, thus preventing the normal opening and closing of the ball valve.

[0020] In this embodiment, a threaded hole 20 is provided at the lower end of the center rod 8. The first connector rod 9 is detachably connected to the center rod 8 through the threaded hole 20. By rotating the first connector rod 9, the length of the first connector rod 9 extending out of the threaded hole 20 can be adjusted. This not only facilitates the connection and disassembly of the first connector rod 9, but also allows for fine adjustment of the relative position of the first connector rod 9 and the second connector rod 10 to meet actual precision requirements.

[0021] In this embodiment, a flange 21 is fixedly connected to the upper end of the central rod 8. The central hole of the flange 21 is detachably connected to the central rod 8. The upper end of the valve stem 2 forms a flange platform 22 that mates with the flange 21, which facilitates the installation and disassembly of the central rod 8.

[0022] In this embodiment, the valve body 1 includes a left valve body 23 and a right valve body 24. The right end face of the left valve body 23 has a mounting hole 25 that mates with the right valve body 24. The right valve body 24 presses the right sealing ring 7 against the valve core 3, and the valve core 3 presses the left sealing ring 6 against the limiting end face formed inside the left valve body 23.

[0023] In this embodiment, a hydraulic channel 26 is provided on the inner side of the left valve body 23. The hydraulic channel 26 is designed as a whole within the left valve body 23. The relevant process principle is existing technology. The structure of the hydraulic channel 26 does not need to be too complex and can be realized in the early stage of mold formation, so it will not be described in detail here. The right end face of the left valve body 23 forms the first channel opening 27 of the hydraulic channel 26. A first piston 28 is slidably sealed and installed in the first channel opening 27. The first piston 28 is connected to the left valve body 23 through a first elastic support member. The outer end of the first piston 28 is in contact with the left end face of the right valve body 24. The limiting end face of the left valve body 23 forms the second channel opening 29 of the hydraulic channel 26. A second piston 30 is slidably sealed and installed in the second channel opening 29. The second piston 30 is connected to the left valve body 23 through a second elastic support member. The outer end of the second piston 30 is in contact with the left end face of the left sealing ring 6.

[0024] This invention designs a hydraulic channel 26 to provide timely remedies in case of failure between the central rod 8 and the connecting rod assembly, ensuring the normal operation of the valve body 1. Specifically, during the installation of the right valve body 24, if the right valve body 24 moves excessively to the left, the right sealing ring 7 applies excessive pressure to the valve core 3 to the left, thus driving the valve core 3 to move to the left. At this time, the right valve body 24 can act on the first piston 28, which applies oil pressure to the second piston 30. The second piston 30 moves outward, thus acting on the left piston, driving the left sealing ring 6 to move to the right and act on the valve core 3 to the right. This balances the force on the right sealing ring 7, reducing the degree of deflection of the valve core 3 or the valve rod 2.

[0025] In this embodiment, the first elastic support and the second elastic support have the same structure. The first elastic support includes a slider 31 and a support spring 32. The slider 31 is fixed to the outside of the first piston 28. The inner side of the hydraulic channel 26 is provided with a groove 33 for the slider 31 to slide. The two ends of the support spring 32 are respectively connected to the slider 31 and the left valve body 23. The first elastic support and the second elastic support are designed to restore the first piston 28 and the second piston 30 to their original positions. After the ball valve maintenance is completed, it is beneficial to reuse the device.

[0026] In this embodiment, the left end of the left valve body 23 is detachably connected to the end valve body 34. The right end face of the end valve body 34 is formed with a right groove 35, and the left end face of the left valve body 23 is formed with a left groove 36. The left groove 36 and the right groove 35 are combined to form part of the channel 5 of the hydraulic channel 26, which can facilitate the forming of the hydraulic channel 26 and also facilitate the subsequent cleaning of the interior of the hydraulic channel 26, reducing blockage during use.

Claims

1. A leak-proof ball valve, characterized by: The utility model provides a valve, including valve body, valve rod, valve core, the valve body is seted up the valve rod hole for the valve rod to pass through, the valve rod is inserted into the valve body one end and is connected to the valve core, the inside of valve body forms the passageway with the cooperation of valve core, the passageway is installed left seal ring and right seal ring, left seal ring and right seal ring are located the left and right sides of valve core respectively, the center of valve rod is connected with the center rod, and the center rod passes through the bottom of valve core and is coaxially connected to the first joint rod, and the first joint rod is connected with the second joint rod through two groups of connecting rod assemblies, and the structure of two groups of connecting rod assemblies is completely same and is set up parallel to each other, and the second joint rod is slidably installed in the mounting seat along the axial direction of center rod, and the second joint rod is connected with the mounting seat through the elastic connecting device, and the mounting seat is rotatably installed in the base, and the base is fixed on the inside bottom of valve body.

2. A leak-proof ball valve according to claim 1, characterized in that: The first joint rod and the second joint rod are provided with opening slots for installing the connecting rod assemblies, and the connecting rod assemblies include a first pin, a first connecting rod, a second pin, a second connecting rod, and a third pin. The first pin is fixedly connected in the opening slot of the first joint rod. The first pin is hingedly connected to one end of the first connecting rod. The other end of the first connecting rod is hingedly connected to one end of the second connecting rod through the second pin. The other end of the second connecting rod is hingedly connected to the third pin. The third pin is fixedly connected in the opening slot of the second joint rod.

3. A leak-tight ball valve according to claim 2, characterized in that: A threaded hole is formed in the lower end of the center rod. The first joint rod is detachably connected to the center rod through the threaded hole. The length of the first joint rod extending out of the threaded hole can be adjusted by rotating the first joint rod.

4. A leak-tight ball valve according to claim 3, characterized in that: A flange is fixedly connected to the upper end of the center rod. A central hole of the flange is detachably connected to the center rod. The upper end of the valve rod forms a flange table for cooperating with the flange.

5. A leak-tight ball valve according to any one of claims 1-4, characterized in that: The valve body includes a left valve body and a right valve body. The right end surface of the left valve body forms a mounting hole for cooperating with the right valve body. The right valve body presses the right seal ring against the valve core. The valve core presses the left seal ring against a limiting end surface formed on the inside of the left valve body.

6. A leak-tight ball valve according to claim 5, characterized in that: A hydraulic passage is formed on the inside of the left valve body. The right end surface of the left valve body forms a first passage opening of the hydraulic passage. A first piston is slidably and sealingly installed in the first passage opening. The first piston is connected to the left valve body through a first elastic support. The outer end of the first piston is in contact with the left end surface of the right valve body. The limiting end surface of the left valve body forms a second passage opening of the hydraulic passage. A second piston is slidably and sealingly installed in the second passage opening. The second piston is connected to the left valve body through a second elastic support. The outer end of the second piston is in contact with the left end surface of the left seal ring.

7. A leak-tight ball valve according to claim 6, characterized in that: The first elastic support and the second elastic support have the same structure. The first elastic support includes a sliding block and a support spring. The sliding block is fixed to the outside of the first piston. A sliding groove is formed on the inside of the hydraulic passage for the sliding block to slide. The two ends of the support spring are connected to the sliding block and the left valve body, respectively.

8. A leak-tight ball valve according to claim 7, characterized in that: A left end of the left valve body is detachably connected to an end valve body. A right recess is formed on the right end surface of the end valve body. A left recess is formed on the left end surface of the left valve body. The left recess and the right recess combine to form part of the hydraulic passage.

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