Sealing stop valve with low friction coefficient and long-acting sealing performance

Abstract

The sealing stop valve with the low friction coefficient and the long-acting sealing performance comprises a valve body and a valve deck, a valve rod is connected to the interior of the valve deck in a penetrating mode, the tail end of the valve rod is connected with a valve clack through a flexible connecting mechanism, and side plates are connected to the positions, located on the two sides of a filler shell, of the upper portion of a sleeve; a threaded sleeve is connected to the top of the side plate, a threaded rod is connected to the interior of the threaded sleeve in a threaded mode, an elastic protection mechanism and a hand wheel are arranged on the outer side of the threaded rod, a corrugated pipe is arranged on the outer side of the valve rod, the corrugated pipe has a telescopic function and can be stretched or shortened along with the valve rod, packing and a medium can be separated easily, and the sealing performance of the packing is improved. The elastic force of the first spring and the second spring connected to the outer sides of the first sleeve and the second sleeve in a sleeving mode is utilized, the elastic recovery capacity between the inner walls of the upper side and the lower side of the corrugated pipe is improved, the mechanical strength of the corrugated pipe is improved, the service life of the corrugated pipe is prolonged, and the effect of long-acting sealing performance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, and in particular to a sealed stop valve with a low friction coefficient and long-term sealing performance. Background Art

[0002] The stop valve, also known as the cut-off valve, is a valve widely used in pipeline systems. It uses the valve stem to drive the valve disc to move up and down along the axis of the valve seat sealing surface to achieve the purpose of opening and closing. The stop valve is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to ensure that the sealing surface does not leak. The main function of the stop valve is to control the flow in the pipeline or close the pipeline. Due to the different materials and structures of the stop valve, according to its use and working environment, it can be divided into stop valves of different materials such as stainless steel stop valves, ball stop valves, and copper alloy stop valves.

[0003] At present, when the stop valve is in use, the packing is an important component of the valve seal. It is in direct contact with the valve stem. However, when using an F wrench to operate it, it is easy to use excessive force, resulting in uneven force on the valve stem and causing it to tilt, which increases the friction coefficient between the two and easily causes wear on the packing. As a result, the packing of the valve stem seal will gradually age during use, which in turn causes the valve to leak. Summary of the invention

[0004] In order to achieve the above object, the present invention provides the following technical solutions: A sealed stop valve with low friction coefficient and long-term sealing performance, comprising: A valve body, wherein a valve seat is connected to the inside of the valve body, a valve cover is fixedly connected to the top of the valve body by fixing bolts, a sleeve is fixedly connected to the top of the valve cover, a stuffing shell is fixedly connected to the top of the sleeve, a valve stem is connected to the inside of the stuffing shell, a first sealing mechanism is arranged inside the stuffing shell and outside the valve stem, a second sealing mechanism is arranged outside the valve stem and inside the valve cover, a movable block is fixedly connected to the end of the valve stem, a flexible connection mechanism is arranged at the bottom of the movable block, a valve disc is connected to the bottom of the movable block by the flexible connection mechanism, and the position of the valve disc corresponds to the position of the valve seat; Side plates are connected to both sides of the packing shell above the sleeve, a threaded sleeve is connected to the top of the side plate, a screw is connected to the internal thread of the threaded sleeve, a bearing seat is rotatably connected to the end of the screw, the bottom of the bearing seat is fixedly connected to the valve stem, a pair of first sliders are correspondingly connected to the outside of the bearing seat, a guide rail is slidably connected to the outside of the first slider, and the guide rail is fixedly connected to the inner wall of the side plate; A pair of second limiting holes are opened from top to bottom inside the screw rod, an elastic protection mechanism is arranged on the outer side of the screw rod at the position of the second limiting holes, and a hand wheel is connected to the outer side of the elastic protection mechanism.

[0005] In a possible implementation, the first sealing mechanism includes three polytetrafluoroethylene packing rings and a packing gland. The three polytetrafluoroethylene packing rings are sequentially sleeved on the outside of the valve stem from top to bottom. The packing gland is located on the top of the polytetrafluoroethylene packing ring, and the packing gland is fixedly connected to the packing shell by fixing bolts. The polytetrafluoroethylene packing ring has the advantages of strong sealing, high pressure resistance, strong corrosion resistance, etc., can effectively resist the erosion of chemical media, and reduce friction loss.

[0006] In a possible implementation, the second sealing mechanism includes a fixed ring, a bellows and a movable ring, the upper and lower ends of the bellows are fixedly connected to the movable ring and the fixed ring respectively, the inner side of the fixed ring is fixedly connected to the valve stem, the inner side of the movable ring is slidably connected to the valve stem, the outer side of the valve stem is located inside the bellows and is slidably connected with a round tube, the bottom of the round tube is fixedly connected to the fixed ring, the bellows itself has a telescopic function, and can be stretched or shortened with the valve stem, which is conducive to isolating the packing from the medium and has a sealing effect; The outer side of the circular tube is slidably connected with a plurality of first rings from top to bottom, the outer side of the first ring is circumferentially connected with four support frames, one end of the support frame is penetrated and connected with a second ring, the outer side of the second ring is circumferentially provided with eight telescopic components, the upper and lower sides of the telescopic components are respectively connected with an upper disc and a lower disc, and the upper and lower discs are respectively fixed on the upper and lower sides of the inner wall of the corrugated tube bag.

[0007] In a possible implementation, the telescopic assembly includes a second hinge rod, an axial hole is opened at the middle position inside the second hinge rod, the second sleeve passes through the interior of the axial hole, the left end of the second hinge rod is rotatably connected to the first shaft rod, the outer side of the first shaft rod is rotatably connected to the first sleeve, the first sleeve is slidably connected to the first hinge rod, one end of the first hinge rod is rotatably connected to the first hinge seat, the top of the first hinge seat is fixedly connected to the upper disc, the outer side of the first sleeve is fixedly connected to the second fixing plate, the outer side of the first hinge rod is fixedly connected to the first fixing plate, the inner sides of the second fixing plate and the first fixing plate are fixedly connected to the first spring, the first spring is sleeved on the outer sides of the first hinge rod and the first sleeve, and in the process of lifting and lowering the valve stem, the upper disc and the lower disc are driven to extend and retract, and at the same time, the elastic force of the first spring and the second spring sleeved on the outer sides of the first sleeve and the second sleeve is used to increase the elastic recovery capacity between the upper and lower inner walls of the bellows, thereby improving the mechanical strength and service life of the bellows and achieving the effect of long-term sealing performance; The right end of the second hinged rod is rotatably connected to the second shaft rod, the outer side of the second shaft rod is rotatably connected to the second sleeve, the inner side of the second sleeve is slidably connected to the fourth hinged rod, the right end of the fourth hinged rod is rotatably connected to the second hinged seat, the bottom of the second hinged seat is fixedly connected to the lower disk, the outer side of the second sleeve is fixedly connected to the third fixing plate, the outer side of the fourth hinged rod is fixedly connected to the fourth fixing plate, the inner sides of the third fixing plate and the fourth fixing plate are fixedly connected to the second spring, and the second spring is sleeved inside the second sleeve and the fourth fixing plate.

[0008] In a possible implementation, four sliding grooves are circumferentially formed on the outer side of the circular tube, a second sliding block is slidably connected inside the sliding groove, and the second sliding block is fixedly connected to the inner wall of the first ring.

[0009] In a possible implementation, the internal structure of the bellows includes an epoxy resin coating, a substrate, and a polyurethane coating, and the epoxy resin coating, the substrate, and the polyurethane coating are arranged in sequence from the outside to the inside.

[0010] In a possible implementation, a sealing ring is connected to the inner wall of the sleeve near the bottom, and the inner diameter of the sealing ring is larger than the outer diameter of the movable ring.

[0011] In a possible implementation, the flexible connection mechanism includes four connecting rods, both ends of the connecting rods are connected to a base, the top of the base is connected to a third spring, the top of the third spring is fixedly connected to the movable block, a spacer ring is fixedly connected to the middle position of the outer side of the connecting rod, and a fourth spring is sleeved on the left and right sides of the outer side of the connecting rod, the other end of the fourth spring is fixedly connected to a sliding sleeve, the sliding sleeve is sleeved on the outer side of the connecting rod, and the top of the sliding sleeve is fixedly connected to a third articulated seat, the inside of the third articulated seat is rotatably connected to the third articulated rod, one end of the third articulated rod is rotatably connected to the fourth articulated seat, and the top of the fourth articulated seat is fixedly connected to the movable block, so that the valve stem and the valve disc achieve a flexible connection effect, and the movable valve disc can absorb the vibration of the medium during flow without transmitting the vibration to the bellows, thereby extending the fatigue resistance of the bellows and improving the toughness of the bellows.

[0012] In a possible implementation, the top of the valve flap is located outside the movable block and is fixedly connected to a shell, the front and rear side walls of the shell are each provided with a pair of positioning grooves, the interior of the positioning groove is slidably connected to a positioning block, and the positioning block is fixedly connected to the movable block.

[0013] In one possible implementation, the elastic protection mechanism includes a positioning cylinder, a first limiting hole is opened inside the positioning cylinder, a positioning rod is connected through the inside of the first limiting hole and the second limiting hole, a second silicone rubber pad is fixedly connected to the outside of the positioning cylinder, the outside of the second silicone rubber pad is in contact with the handwheel, the second silicone rubber pad and the top of the first limiting hole are connected to the first silicone rubber pad, a gasket is connected above the first silicone rubber pad, a nut is connected above the gasket, and the nut is threadedly connected to the screw, so that when the handwheel is rotated with excessive force, it can weaken part of the lateral pressure applied to the screw, avoid the screw from tilting to one side, and thereby reduce the friction between the valve stem and the packing.

[0014] In the above technical solution, the technical effects and advantages provided by the present invention are: 1. By arranging a bellows on the outside of the valve stem, the bellows itself has a telescopic function and can be stretched or shortened along with the valve stem, which is beneficial to isolating the packing from the medium and achieving a sealing effect. In addition, by arranging an upper disc and a lower disc on the inner walls of the upper and lower sides of the bellows respectively, and arranging a plurality of telescopic first sleeves and second sleeves in the middle of the upper and lower discs, it is convenient to drive the upper and lower discs to telescope during the lifting and lowering of the valve stem. At the same time, the elastic force of the first spring and the second spring is sleeved on the outer sides of the first sleeve and the second sleeve to increase the elastic recovery capacity between the inner walls of the upper and lower sides of the bellows, thereby improving the mechanical strength and service life of the bellows and achieving the effect of long-term sealing performance.

[0015] 2. Fix the positioning cylinder on the screw through the positioning rod, place the handwheel on the positioning cylinder, and then fix the gasket, handwheel and positioning cylinder on the screw by tightening the nut. By setting the second silicone rubber pad on the inner side of the handwheel and the first silicone rubber pad under the gasket, it is beneficial to increase the pressure resistance of the outer side of the screw, so that when the handwheel is rotated excessively, it can weaken the lateral pressure applied to the screw, avoid the screw from tilting to one side, and thus reduce the friction between the valve stem and the packing.

[0016] 3. By setting the third spring, the fourth spring, the third hinged seat, the third hinged rod and the fourth hinged seat, the valve stem and the valve disc can achieve a flexible connection effect. The movable valve disc can absorb the vibration during the flow of the medium without transmitting the vibration to the bellows, thereby extending the fatigue resistance of the bellows and improving the toughness of the bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 An exploded view of the valve cover and valve body of the present invention; Figure 3 is a cross-sectional view of the valve body of the present invention; Figure 4 For the present invention Figure 2 Exploded view of the screw and threaded sleeve; Figure 5 For the present invention Figure 4 Exploded view of the top structure of the middle screw; Figure 6 For the present invention Figure 4 Cross-sectional view of the center side plate, sleeve, housing and gland; Figure 7 For the present invention Figure 4 A schematic diagram of the structure of the bottom of the middle sleeve; Figure 8 For the present invention Figure 7 Exploded view of the middle valve cover and bellows; Fig. 9 is a cross-sectional view of the bellows and valve stem of the present invention; Fig.10 For the present invention Fig. 9 The enlarged view of point A in the middle; Fig.11 A cross-sectional view of the internal structure of the bellows of the present invention; Fig.12 It is a schematic diagram of the overall structure of the upper disc and the lower disc of the present invention; Fig.13 An exploded view of the upper disc and the lower disc of the present invention; Fig.14 It is a structural schematic diagram of the first sleeve, the second hinged rod and the second sleeve of the present invention; Fig.15 This is a schematic structural diagram of the top of the circular tube of the present invention; Fig.16 It is an exploded view of the housing and the valve stem of the present invention.

[0019] Description of reference numerals: 1. Hand wheel; 2. Screw; 3. Side plate; 4. Sleeve; 5. Valve cover; 6. Valve body; 7. Bearing seat; 8. Bellows; 801. Epoxy resin coating; 802. Base material; 803. Polyurethane coating; 9. Valve stem; 10. Shell; 11. Valve disc; 12. Valve seat; 13. First slider; 14. Packing shell; 15. Packing gland; 16. Threaded sleeve; 17. Gasket; 18. First silicone rubber pad; 19. Second silicone rubber pad; 20. First limiting hole; 21. Positioning cylinder; 22. Positioning rod; 23. Second limiting hole; 24. Guide rail; 25. Polytetrafluoroethylene packing ring; 26. Sealing ring; 27. Movable ring; 28. Fixed ring; 29. ​​Round tube; 30. First ring; 31. Support frame; 32. Upper disc; 33. Lower disc Plate; 34, second slider; 35, second sleeve; 36, first hinge seat; 37, first hinge rod; 38, first fixed plate; 39, first spring; 40, second fixed plate; 41, first sleeve; 42, first shaft rod; 43, second hinge rod; 44, shaft hole; 45, second shaft rod; 46, second sleeve; 47, third fixed plate; 48, second spring; 49, fourth fixed plate; 50, second hinge seat; 51, fourth hinge rod; 52, slide groove; 53, movable block; 54, third spring; 55, base; 56, connecting rod; 57, sleeve; 58, fourth spring; 59, spacer ring; 60, third hinge seat; 61, third hinge rod; 62, fourth hinge seat; 63, positioning block; 64, positioning groove; 65, nut. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The embodiments of the present application solve the problems in the prior art by providing a sealed stop valve with a low friction coefficient and long-lasting sealing performance.

[0022] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows: like Figure 1-Figure 16 As shown, a sealing stop valve with low friction coefficient and long-term sealing performance comprises: A valve body 6, the interior of the valve body 6 is connected with a valve seat 12, the top of the valve body 6 is fixedly connected with a valve cover 5 by fixing bolts, the top of the valve cover 5 is fixedly connected with a sleeve 4, the top of the sleeve 4 is fixedly connected with a stuffing shell 14, the interior of the stuffing shell 14 is penetrated and connected with a valve stem 9, a first sealing mechanism is provided inside the stuffing shell 14 and located outside the valve stem 9, a second sealing mechanism is provided outside the valve stem 9 and located inside the valve cover 5, a movable block 53 is fixedly connected to the end of the valve stem 9, a flexible connection mechanism is provided at the bottom of the movable block 53, a valve flap 11 is connected to the bottom of the movable block 53 by the flexible connection mechanism, and the position of the valve flap 11 corresponds to the position of the valve seat 12; Side plates 3 are connected to both sides of the packing shell 14 above the sleeve 4, a threaded sleeve 16 is connected to the top of the side plate 3, the internal thread of the threaded sleeve 16 is connected to the screw 2, the end of the screw 2 is rotatably connected to the bearing seat 7, the bottom of the bearing seat 7 is fixedly connected to the valve stem 9, a pair of first sliders 13 are correspondingly connected to the outer side of the bearing seat 7, the outer side of the first slider 13 is slidably connected to the guide rail 24, and the guide rail 24 is fixedly connected to the inner wall of the side plate 3; A pair of second limiting holes 23 are opened from top to bottom inside the screw rod 2 , and an elastic protection mechanism is arranged on the outer side of the screw rod 2 at the position of the second limiting holes 23 , and a hand wheel 1 is connected to the outer side of the elastic protection mechanism.

[0023] The present invention provides a second sealing mechanism, and the bellows 8 in the first sealing mechanism has a telescopic function, which can be stretched or shortened with the valve stem 9, which is beneficial to isolating the packing from the medium and achieving a sealing effect. In the process of the valve stem 9 rising and falling, the upper disc 32 and the lower disc 33 are driven to telescope, and at the same time, the elastic force of the first spring 39 and the second spring 48 sleeved on the outside of the first sleeve 41 and the second sleeve 46 is used to increase the elastic recovery ability between the upper and lower inner walls of the bellows 8, improve the mechanical strength and service life of the bellows 8, and achieve the effect of long-term sealing performance; by providing the first sealing mechanism, it is beneficial to reduce friction loss; by providing a flexible connection mechanism, the valve stem 9 and the valve flap 11 achieve a flexible connection effect, and the movable valve flap 11 can absorb the vibration of the medium when it flows, but does not transmit the vibration to the bellows 8, thereby extending the fatigue resistance of the bellows 8 and improving the toughness of the bellows 8; by providing an elastic protection mechanism, it is beneficial to weaken the lateral pressure applied to the screw 2, avoid the screw 2 from tilting to one side, and thus reduce the friction between the valve stem 9 and the packing.

[0024] like Figure 6 As shown, the first sealing mechanism includes three polytetrafluoroethylene packing rings 25 and a packing gland 15. The three polytetrafluoroethylene packing rings 25 are sequentially sleeved on the outer side of the valve stem 9 from top to bottom. The packing gland 15 is located on the top of the polytetrafluoroethylene packing rings 25, and the packing gland 15 is fixedly connected to the packing shell 14 by fixing bolts.

[0025] The present invention arranges a polytetrafluoroethylene packing ring 25 in the packing shell 14. The polytetrafluoroethylene packing ring 25 has the advantages of strong sealing, high pressure resistance, strong corrosion resistance, etc., can effectively resist the erosion of chemical media, and reduce friction loss.

[0026] like Figure 8-Figure 15 As shown, the second sealing mechanism includes a fixed ring 28, a bellows 8 and a movable ring 27. The upper and lower ends of the bellows 8 are fixedly connected to the movable ring 27 and the fixed ring 28 respectively. The inner side of the fixed ring 28 is fixedly connected to the valve stem 9. The inner side of the movable ring 27 is slidably connected to the valve stem 9. The outer side of the valve stem 9 is located inside the bellows 8 and is slidably connected with a round tube 29. The bottom of the round tube 29 is fixedly connected to the fixed ring 28. When the valve stem 9 rises, the fixed ring 28 rises synchronously and squeezes the bellows 8. Similarly, when the valve stem 9 descends, the fixed ring 28 descends synchronously and stretches the bellows 8. The outer side of the circular tube 29 is slidably connected with a plurality of first rings 30 from top to bottom, the outer side of the first ring 30 is circumferentially connected with four support frames 31, one end of the support frame 31 is penetrated and connected with a second ring 35, and the outer side of the second ring 35 is circumferentially provided with eight telescopic components, the upper and lower sides of the telescopic components are respectively connected with an upper disc 32 and a lower disc 33, the upper disc 32 and the lower disc 33 are respectively fixed on the upper and lower sides of the inner wall of the tube bag of the bellows 8, during the lifting and lowering process of the valve stem 9, the upper disc 32 and the lower disc 33 are driven to extend and retract, and at the same time, the elastic force of the first spring 39 and the second spring 48 connected to the outer side of the first sleeve 41 and the second sleeve 46 is utilized to increase the elastic recovery capacity between the upper and lower inner walls of the bellows 8, thereby improving the mechanical strength and service life of the bellows 8 and achieving the effect of long-term sealing performance.

[0027] In some examples, the telescopic assembly includes a second hinge rod 43, an axial hole 44 is opened at the middle position inside the second hinge rod 43, a second ring 35 passes through the interior of the axial hole 44, the left end of the second hinge rod 43 is rotatably connected to the first shaft rod 42, the outer side of the first shaft rod 42 is rotatably connected to the first sleeve 41, the interior of the first sleeve 41 is slidably connected to the first hinge rod 37, one end of the first hinge rod 37 is rotatably connected to the first hinge seat 36, the top of the first hinge seat 36 is fixedly connected to the upper disc 32, the outer side of the first sleeve 41 is fixedly connected to the second fixing plate 40, the outer side of the first hinge rod 37 is fixedly connected to the first fixing plate 38, the inner sides of the second fixing plate 40 and the first fixing plate 38 are fixedly connected to the first spring 39, the first spring 39 is sleeved on the outer sides of the first hinge rod 37 and the first sleeve 41, when the upper disc 32 and the lower disc 33 are squeezed, it is convenient for the first hinge rod 37 to telescope along the first sleeve 41; The right end of the second hinged rod 43 is rotatably connected to the second shaft rod 45, the outer side of the second shaft rod 45 is rotatably connected to the second sleeve 46, the inside of the second sleeve 46 is slidably connected to the fourth hinged rod 51, the right end of the fourth hinged rod 51 is rotatably connected to the second hinge seat 50, the bottom of the second hinge seat 50 is fixedly connected to the lower disc 33, the outer side of the second sleeve 46 is fixedly connected to the third fixing plate 47, the outer side of the fourth hinged rod 51 is fixedly connected to the fourth fixing plate 49, the inner sides of the third fixing plate 47 and the fourth fixing plate 49 are fixedly connected to the second spring 48, the second spring 48 is sleeved on the inside of the second sleeve 46 and the fourth fixing plate 49, so as to facilitate the extension and retraction of the fourth hinged rod 51 along the second sleeve 46.

[0028] In some examples, four slide grooves 52 are circumferentially opened on the outer side of the circular tube 29, and the second slider 34 is slidably connected inside the slide groove 52. The second slider 34 is fixedly connected to the inner wall of the first ring 30 to facilitate the first ring 30 to move freely up and down.

[0029] In some examples, the internal structure of the bellows 8 includes an epoxy resin coating 801, a substrate 802 and a polyurethane coating 803, which are arranged in sequence from the outside to the inside. The epoxy resin coating 801 has excellent adhesion, chemical corrosion resistance and mechanical strength. It can effectively prevent corrosive media from penetrating into the surface of the bellows 8 and provide long-term protection. The polyurethane coating 803 has the advantages of high hardness, good wear resistance and good flexibility. It can adapt to the deformation and vibration of the bellows 8 during use and provide good anti-corrosion protection.

[0030] In some examples, a sealing ring 26 is connected to the inner wall of the sleeve 4 near the bottom. The inner diameter of the sealing ring 26 is larger than the outer diameter of the movable ring 27. The provision of the sealing ring 26 facilitates positioning and sealing of the movable ring 27.

[0031] The present invention provides a bellows 8 on the outer side of the valve stem 9. The bellows 8 itself has a telescopic function and can be stretched or shortened along with the valve stem 9, which is beneficial to isolating the filler from the medium and achieving a sealing effect. In addition, an upper disc 32 and a lower disc 33 are respectively provided on the upper and lower inner walls of the bellows 8, and a plurality of telescopic first sleeves 41 and second sleeves 46 are provided in the middle position of the upper and lower discs 32 and 33, so that the upper and lower discs 32 and 33 can be driven to telescope during the lifting and lowering of the valve stem 9. At the same time, the elastic force of the first spring 39 and the second spring 48 is sleeved on the outer sides of the first sleeve 41 and the second sleeve 46 to increase the elastic recovery capacity between the upper and lower inner walls of the bellows 8, thereby improving the mechanical strength and service life of the bellows 8 and achieving the effect of long-term sealing performance.

[0032] like Figure 7-Figure 8 and Fig.16 As shown, the flexible connection mechanism includes four connecting rods 56, both ends of the connecting rods 56 are connected to a base 55, the top of the base 55 is connected to a third spring 54, the top of the third spring 54 is fixedly connected to the movable block 53, the middle position of the outer side of the connecting rod 56 is fixedly connected to a spacer ring 59, the outer side of the connecting rod 56 is located on the left and right sides of the spacer ring 59 and is sleeved with a fourth spring 58, the other end of the fourth spring 58 is fixedly connected to a sliding sleeve 57, the sliding sleeve 57 is sleeved on the outer side of the connecting rod 56, and the sliding sleeve 57 The top of the valve disc 11 is fixedly connected to a third articulated seat 60, the inside of the third articulated seat 60 is rotatably connected to a third articulated rod 61, one end of the third articulated rod 61 is rotatably connected to a fourth articulated seat 62, and the top of the fourth articulated seat 62 is fixedly connected to the movable block 53. When the valve disc 11 is vibrated, with the cooperation of the fourth spring 58, the third articulated seat 60, the third articulated rod 61, the fourth articulated seat 62 and the third spring 54, it is beneficial to buffer the vibration and reduce the impact of the vibration on the bellows 8.

[0033] In some examples, the top of the valve flap 11 is located on the outside of the movable block 53 and is fixedly connected to the outer shell 10. The front and rear side walls of the outer shell 10 are each provided with a pair of positioning grooves 64. The interior of the positioning groove 64 is slidably connected to a positioning block 63. The positioning block 63 is fixedly connected to the movable block 53, so that the movable block 53 and the valve flap 11 can move up and down.

[0034] The present invention achieves a flexible connection effect between the valve stem 9 and the valve flap 11 by arranging a third spring 54, a fourth spring 58, a third hinge seat 60, a third hinge rod 61 and a fourth hinge seat 62. The movable valve flap 11 can absorb the vibration during the flow of the medium without transmitting the vibration to the bellows 8, thereby extending the fatigue resistance of the bellows 8 and improving the toughness of the bellows 8.

[0035] like Figure 1-Figure 5 As shown, the elastic protection mechanism includes a positioning cylinder 21, a first limiting hole 20 is opened inside the positioning cylinder 21, a positioning rod 22 is connected to the inside of the first limiting hole 20 and the second limiting hole 23, a second silicone rubber pad 19 is fixedly connected to the outer side of the positioning cylinder 21, the outer side of the second silicone rubber pad 19 is in contact with the handwheel 1, the second silicone rubber pad 19 and the top of the first limiting hole 20 are connected to the first silicone rubber pad 18, a gasket 17 is connected above the first silicone rubber pad 18, a nut 65 is connected above the gasket 17, and the nut 65 is threadedly connected to the screw 2.

[0036] The present invention places the handwheel 1 on the positioning cylinder 21, and then fixes the gasket 17, the handwheel 1 and the positioning cylinder 21 on the screw 2 by tightening the nut 65. By arranging the second silicone rubber pad 19 on the inner side of the handwheel 1 and the first silicone rubber pad 18 under the gasket 17, it is beneficial to increase the pressure resistance of the outer side of the screw 2, and when the handwheel 1 is rotated with excessive force, it can weaken part of the lateral pressure applied to the screw 2, avoid the screw 2 from tilting to one side, and thereby reduce the friction between the valve stem 9 and the packing.

[0037] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sealed stop valve with low friction coefficient and long-term sealing performance, characterized in that: include: A valve body (6), wherein the interior of the valve body (6) is connected to a valve seat (12), the top of the valve body (6) is fixedly connected to a valve cover (5) via fixing bolts, the top of the valve cover (5) is fixedly connected to a sleeve (4), the top of the sleeve (4) is fixedly connected to a stuffing shell (14), the interior of the stuffing shell (14) is penetrated by a valve stem (9), a first sealing mechanism is provided inside the stuffing shell (14) and located outside the valve stem (9), a second sealing mechanism is provided outside the valve stem (9) and located inside the valve cover (5), a movable block (53) is fixedly connected to the end of the valve stem (9), a flexible connection mechanism is provided at the bottom of the movable block (53), a valve flap (11) is connected below the movable block (53) via the flexible connection mechanism, and the position of the valve flap (11) corresponds to the position of the valve seat (12); Side plates (3) are connected to both sides of the packing shell (14) above the sleeve (4), a threaded sleeve (16) is connected to the top of the side plate (3), the internal thread of the threaded sleeve (16) is connected to a screw (2), the end of the screw (2) is rotatably connected to a bearing seat (7), the bottom of the bearing seat (7) is fixedly connected to the valve stem (9), the outer side of the bearing seat (7) is correspondingly connected to a pair of first sliders (13), the outer side of the first slider (13) is slidably connected to a guide rail (24), and the guide rail (24) is fixedly connected to the inner wall of the side plate (3); A pair of second limiting holes (23) are provided inside the screw rod (2) from top to bottom, an elastic protection mechanism is provided on the outside of the screw rod (2) at the position of the second limiting holes (23), and a hand wheel (1) is connected to the outside of the elastic protection mechanism.

2. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 1, characterized in that: The first sealing mechanism comprises three polytetrafluoroethylene packing rings (25) and a packing gland (15), wherein the three polytetrafluoroethylene packing rings (25) are sleeved on the outer side of the valve stem (9) in sequence from top to bottom, the packing gland (15) is located on the top of the polytetrafluoroethylene packing rings (25), and the packing gland (15) is fixedly connected to the packing shell (14) by fixing bolts.

3. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 1, characterized in that: The second sealing mechanism comprises a fixed ring (28), a bellows (8) and a movable ring (27); the upper and lower ends of the bellows (8) are fixedly connected to the movable ring (27) and the fixed ring (28) respectively; the inner side of the fixed ring (28) is fixedly connected to the valve stem (9); the inner side of the movable ring (27) is slidably connected to the valve stem (9); the outer side of the valve stem (9) is located inside the bellows (8) and is slidably connected to a round tube (29); the bottom of the round tube (29) is fixedly connected to the fixed ring (28); The outer side of the circular tube (29) is slidably connected to a plurality of first rings (30) from top to bottom, the outer side of the first rings (30) is circumferentially connected to four support frames (31), one end of the support frame (31) is penetrated and connected to a second ring (35), and the outer side of the second ring (35) is circumferentially provided with eight telescopic components, the upper and lower sides of the telescopic components are respectively connected to an upper disc (32) and a lower disc (33), and the upper and lower discs (32) and the lower disc (33) are respectively fixed to the upper and lower sides of the inner wall of the tube bag of the corrugated tube (8).

4. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 3, characterized in that: The telescopic assembly comprises a second hinged rod (43), an axial hole (44) is provided at an inner middle position of the second hinged rod (43), the second sleeve (35) passes through the inner part of the axial hole (44), the left end of the second hinged rod (43) is rotatably connected to the first shaft rod (42), the outer side of the first shaft rod (42) is rotatably connected to the first sleeve (41), the inner part of the first sleeve (41) is slidably connected to the first hinged rod (37), one end of the first hinged rod (37) is rotatably connected to the first hinged seat (36), the top of the first hinged seat (36) is fixedly connected to the upper disc (32), the outer side of the first sleeve (41) is fixedly connected to the second fixing plate (40), the outer side of the first hinged rod (37) is fixedly connected to the first fixing plate (38), the inner sides of the second fixing plate (40) and the first fixing plate (38) are fixedly connected to the first spring (39), and the first spring (39) is sleeved on the outer sides of the first hinged rod (37) and the first sleeve (41); The right end of the second hinged rod (43) is rotatably connected to the second shaft rod (45), the outer side of the second shaft rod (45) is rotatably connected to the second sleeve (46), the interior of the second sleeve (46) is slidably connected to the fourth hinged rod (51), the right end of the fourth hinged rod (51) is rotatably connected to the second hinged seat (50), the bottom of the second hinged seat (50) is fixedly connected to the lower disc (33), the outer side of the second sleeve (46) is fixedly connected to the third fixing plate (47), the outer side of the fourth hinged rod (51) is fixedly connected to the fourth fixing plate (49), the inner sides of the third fixing plate (47) and the fourth fixing plate (49) are fixedly connected to the second spring (48), and the second spring (48) is sleeved inside the second sleeve (46) and the fourth fixing plate (49).

5. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 3, characterized in that: Four sliding grooves (52) are formed in an annular direction on the outer side of the circular tube (29), and a second sliding block (34) is slidably connected inside the sliding groove (52), and the second sliding block (34) is fixedly connected to the inner wall of the first sleeve ring (30).

6. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 3, characterized in that: The internal structure of the bellows (8) comprises an epoxy resin coating (801), a substrate (802) and a polyurethane coating (803), wherein the epoxy resin coating (801), the substrate (802) and the polyurethane coating (803) are arranged in sequence from the outside to the inside.

7. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 3, characterized in that: A sealing ring (26) is connected to the inner wall of the sleeve (4) near the bottom, and the inner diameter of the sealing ring (26) is greater than the outer diameter of the movable ring (27).

8. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 1, characterized in that: The flexible connection mechanism comprises four connecting rods (56), both ends of the connecting rods (56) are connected to a base (55), the top of the base (55) is connected to a third spring (54), the top of the third spring (54) is fixedly connected to the movable block (53), a spacer ring (59) is fixedly connected to the middle position of the outer side of the connecting rod (56), the outer side of the connecting rod (56) is sleeved with a fourth spring (58) on both the left and right sides of the spacer ring (59), the other end of the fourth spring (58) is fixedly connected to a sliding sleeve (57), the sliding sleeve (57) is sleeved on the outer side of the connecting rod (56), and the top of the sliding sleeve (57) is fixedly connected to a third hinge seat (60), the inside of the third hinge seat (60) is rotatably connected to a third hinge rod (61), one end of the third hinge rod (61) is rotatably connected to a fourth hinge seat (62), and the top of the fourth hinge seat (62) is fixedly connected to the movable block (53).

9. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 8, characterized in that: The top of the valve flap (11) is located outside the movable block (53) and is fixedly connected to the housing (10). The front and rear side walls of the housing (10) are each provided with a pair of positioning grooves (64). The interior of the positioning groove (64) is slidably connected to a positioning block (63). The positioning block (63) is fixedly connected to the movable block (53).

10. A sealed stop valve with low friction coefficient and long-term sealing performance according to claim 1, characterized in that: The elastic protection mechanism comprises a positioning cylinder (21), a first limiting hole (20) is formed inside the positioning cylinder (21), a positioning rod (22) is connected to the inside of the first limiting hole (20) and the second limiting hole (23), a second silicone rubber pad (19) is fixedly connected to the outside of the positioning cylinder (21), the outside of the second silicone rubber pad (19) is in contact with the hand wheel (1), the top of the second silicone rubber pad (19) and the first limiting hole (20) are connected to the first silicone rubber pad (18), a gasket (17) is connected above the first silicone rubber pad (18), a nut (65) is connected above the gasket (17), and the nut (65) is threadedly connected to the screw rod (2).

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