Soft sealing butterfly valve

Abstract

The invention relates to the technical field of sealing valves, in particular to a soft sealing butterfly valve which comprises a valve body and an electric output device, the electric output device is mounted on the upper side of the valve body, and the soft sealing butterfly valve further comprises a valve rod, a valve plate, a sealing sleeve, a transmission assembly, an adjusting assembly, a sealing piece and a negative pressure assembly. The valve plate is connected to the outer surface of the valve rod, the sealing sleeve is connected to an inner cavity of the valve body, the transmission assembly is connected to the upper end of the valve rod and connected with the electric output device, the adjusting assembly is connected to the middle of the valve rod, the sealing piece is connected with the adjusting assembly, and the negative pressure assembly is connected to an inner cavity of the valve plate. The force bearing points are arranged on the outer edge of the valve plate, so that the side edge can form stable support when the valve plate deviates, and the purpose of guaranteeing the sealing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sealing valves, in particular to a soft sealing butterfly valve. Background Art

[0002] A soft-sealed butterfly valve is a valve that uses the rotation angle of a butterfly plate to control the flow rate of a fluid. Its sealing sleeve is usually made of elastic material. Soft-sealed butterfly valves are widely used in control systems of fluids such as water, oil, and gas. Types of soft-sealed butterfly valves include single eccentric butterfly valves, double eccentric butterfly valves, and triple eccentric butterfly valves. Double eccentric butterfly valves are widely used because they have better sealing properties than single eccentric butterfly valves and are less expensive than triple eccentric butterfly valves.

[0003] The "eccentricity" of the double eccentric butterfly valve refers to the deviation of the axis of the valve stem from the center of the butterfly valve and the center of the valve body. The double eccentric design can reduce the friction between the valve plate and the sealing ring when opening and closing, thereby improving the sealing performance and durability. However, when the double eccentric butterfly valve is in a closed state, the connection point between the valve stem and the valve plate deviates from the longitudinal center line of the valve plate. Under the action of water flow pressure, the position of the valve stem makes the pressure on the pressure surface of the valve plate on both sides of the valve stem unbalanced, which will cause the pressure on the side with a larger area to be greater than that on the side with a smaller area, making the valve stem susceptible to rotation due to the bias pressure, resulting in a weakened sealing effect.

[0004] In view of the above problems, the prior art provides some solutions. For example, a butterfly valve with publication number CN110671504B is provided with a valve plate limit block. When the butterfly valve is closed, the valve plate is locked by lowering the valve plate limit block to contact the outer surface of the valve plate to prevent the valve plate from being damaged or flipped. However, the valve plate limit block is moved downward at the center of the valve plate to limit the valve plate. When the water pressure is high, the force generated by the outer edge toward the center is relatively large. The deflection force generated by the high water pressure can easily cause the valve plate to be tightly pressed against the valve plate limit block, which can easily lead to indentations on the surface of the valve plate. The indentations on the surface of the valve plate can easily affect the sealing effect of the valve plate.

[0005] Therefore, a soft sealing butterfly valve is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a soft-sealed butterfly valve, which solves the problem that the valve plate is easily deflected when affected by high-pressure water flow, causing the connection surface between the valve plate and the valve body to loosen, thereby affecting the sealing effect. By setting a force point on the outer edge of the valve plate, the side of the valve plate can form a stable support when the valve plate is deflected, thereby achieving the purpose of ensuring the sealing effect.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A soft-sealed butterfly valve comprises a valve body and an electric output device, wherein the electric output device is mounted on the upper side of the valve body, and further comprises a valve stem, a valve plate, a sealing sleeve, a transmission assembly, an adjusting assembly, a sealing member and a negative pressure assembly, wherein the valve stem is connected to the middle of the valve body, the valve plate is connected to the outer surface of the valve stem, the sealing sleeve is connected to the inner cavity of the valve body, the transmission assembly is connected to the upper end of the valve stem and is connected to the electric output device, the adjusting assembly is connected to the middle of the valve stem, the sealing member is connected to the adjusting assembly, and the negative pressure assembly is connected to the inner cavity of the valve plate, the electric output device drives the valve plate to fit the sealing sleeve through the transmission assembly, and after the valve plate and the sealing sleeve are fitted, the transmission assembly switches the power of the electric output device to the adjusting assembly, the adjusting assembly drives the sealing member to fit on the sealing sleeve, and the sealing member adsorbs the sealing sleeve under the action of the negative pressure assembly.

[0009] Through the above scheme, after the valve plate is closed, the adjusting component can make the seal fit with the sealing sleeve, thereby increasing the total area of ​​the butterfly valve sealing surface, achieving the purpose of improving the sealing effect. At the same time, when the valve plate is subjected to force, a fulcrum will be formed between the seal and the sealing sleeve, thereby reducing the force on the valve stem and effectively ensuring the service life of the butterfly valve.

[0010] Preferably, the sealing sleeve includes an expansion section, a transition section and a contraction section, and the expansion section, transition section and contraction section are connected to the inner wall of the valve body in sequence from front to back, the inner diameter of the expansion section is greater than the inner diameter of the contraction section, the longitudinal cross-section of the transition section is truncated cone-shaped, and the large and small ends of the transition section are respectively connected to the expansion section and the contraction section.

[0011] Through the above scheme, the truncated cone shape of the transition section cross section can reduce the contact between the valve plate and the sealing sleeve when the valve plate rotates, thereby reducing the wear of the valve plate. At the same time, by setting the contraction section and the expansion section, the inner diameter value of the expansion section is greater than the inner diameter value of the contraction section, so that when the water flows from the contraction section to the expansion section, the flow rate can be slowed down, thereby reducing the impact force on the valve plate, thereby reducing the impact on the valve stem, thereby ensuring that the axial position of the valve stem is fixed, and effectively ensuring the fit between the valve plate and the valve body.

[0012] Preferably, the transmission assembly includes a driving gear, a lower gear, a transmission rod and an upper gear, the driving gear is connected to the power output end of the electric output device, the lower gear is connected to the top of the valve stem, the transmission rod is connected to the inner side of the valve stem, and the upper gear is connected to the top of the transmission rod, thereby, the power of the electric output device can be transmitted to the valve plate, driving the valve plate to rotate.

[0013] Preferably, the driving gear includes a driving wheel, upper teeth and lower teeth, the driving wheel is connected to the power output end of the electric output device, the upper teeth are connected to the rear side of the upper side of the outer surface of the driving wheel, and the lower teeth are connected to the front side of the lower side of the outer surface of the driving wheel, and the upper teeth and the lower teeth are respectively meshed with the upper gear and the lower gear.

[0014] Through the above scheme, when the electric output device drives the active gear to rotate, the upper gear and the lower gear can be driven to rotate respectively, so that when opening the butterfly valve, the position of the sealing sleeve is first adjusted, and then the opening angle of the valve plate is adjusted. When closing the butterfly valve, the valve plate is closed and the position of the sealing sleeve is adjusted.

[0015] Preferably, an upper threaded section and a lower threaded section are distributed above and below the middle part of the transmission rod, and the upper threaded section and the lower threaded section are reverse threads to each other. The adjustment assembly includes a slider, a clamping plate, a hinge rod, a hinge plate and a spring. The two sliders are respectively connected to the upper threaded section and the lower threaded section, the clamping plate is connected to the rear end of the slider, the two hinge rods are respectively connected to the left and right sides of the inner cavity of the valve plate, the two groups of hinge plates are respectively connected to the outer surfaces of the two hinge rods, the number of hinge plates in a group is two, the spring is connected between the two hinge plates, and the slider is triangular.

[0016] Through the above scheme, the upper thread section and the lower thread section are reverse threads to each other, and when the valve stem rotates, it will drive the two sliders to move in the opposite direction. At the same time, the slider is triangular, and when the slider moves, it will squeeze the hinge plate to rotate around the hinge rod, thereby achieving the purpose of adjusting the angle of the hinge plate.

[0017] Preferably, through grooves are provided on the front and rear sides of the valve plate, the hinge plate is "L"-shaped, the short end of the hinge plate passes through the through groove, the rotation trajectory of the hinge plate is adapted to the through groove, and the hinge plate is a hollow structure, thereby facilitating the rotation of the hinge plate. The hinge plate is a hollow structure, thereby facilitating the rotation of the hinge plate.

[0018] Preferably, the sealing member comprises a front sealing plate and a rear sealing plate, the front sealing plate being connected to the front end of the left hinge plate passing through the through groove, the rear sealing plate being connected to the rear end of the right hinge plate passing through the through groove, the outer diameters of the front sealing plate and the rear sealing plate being equal to the diameters of the outer edges of the front and rear sides of the valve plate, respectively, the front sealing plate and the rear sealing plate are both arc-shaped, the number of the front sealing plate and the rear sealing plate are both two, the sum of the arc angles of the two front sealing plates is greater than 180°, and the sum of the arc angles of the two rear sealing plates is greater than 180°.

[0019] Through the above scheme, the sum of the curvature angles of the two front sealing plates is greater than 180° and the sum of the curvature angles of the two rear sealing plates is greater than 180°, so that the total angle covered by the front sealing plates and the rear sealing plates is greater than 360°, and the front sealing plates and the rear sealing plates partially overlap to form a complete sealing surface, thereby achieving a good sealing effect.

[0020] Preferably, the negative pressure component includes an airbag and a limit plate, the airbag is located on the upper side of the valve plate inner cavity, the two ends of the airbag are respectively connected to the hinge plates on the left and right sides, the limit plate is connected to the valve plate inner cavity, the limit plate is arc-shaped, the airbag is arc-shaped and the outer edge is wavy.

[0021] Through the above scheme, the airbag is arc-shaped, so when the hinge plate rotates, the airbag can shrink at a good angle. The limiting plate is arc-shaped, so when the airbag shrinks, the limiting plate will not block the airbag. When the airbag opens, the limiting plate blocks the airbag and slows down the opening speed of the airbag.

[0022] Preferably, the middle parts of the expansion section and the contraction section are connected to the deformation section, the outer edges of the front sealing plate and the rear sealing plate are provided with slots, the front sealing plate and the rear sealing plate are connected to the upper hinge rod, and the distance between the front and rear ends of the slot is smaller than the distance between the front and rear ends of the deformation section.

[0023] Through the above scheme, the seal is fitted with the sealing ring, and the front sealing plate and the rear sealing plate are both connected to the upper hinge rod, so that the slot can be evacuated through the upper hinge rod, and the deformation section is fitted with the slot and affected by the negative pressure, so that the deformation section is recessed into the slot, thereby achieving the purpose of improving the sealing effect.

[0024] Preferably, the front sealing plate and the rear sealing plate are both made of hard materials, and the expansion section and the contraction section are both made of hard materials.

[0025] Through the above scheme, when the front sealing plate and the rear sealing plate are in contact with the expansion section and the contraction section, the hard materials can effectively support each other, effectively reducing the stress concentration on the valve stem when the water flow hits the valve plate, and effectively ensuring the stability of the valve stem.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention solves the problem that the valve plate is prone to deflect when affected by high-pressure water flow, which causes the connection surface between the valve plate and the valve body to loosen, thereby affecting the sealing effect. By setting an adjusting component, the adjusting component drives the seal to rotate before the valve is opened so that the seal fits on the sealing sleeve, so that when the valve plate rotates, the rotation trajectory of the seal intersects with the sealing sleeve, thereby forming a support at the outer edge of the valve plate, effectively ensuring the stability of the valve plate and achieving the purpose of ensuring the sealing effect of the valve plate. At the same time, by setting a negative pressure component, when the sealing sleeve contacts the seal, negative pressure is formed at the notch so that the seal is adsorbed on the sealing sleeve, thereby achieving the purpose of improving the sealing effect.

[0028] 2. By setting a sealing member, the front sealing plate and the rear sealing plate are connected at the opposite side of the valve plate's rotational tendency. When the valve plate rotates, the rotation trajectories of the front sealing plate and the rear sealing plate intersect with the expansion section and the contraction section respectively, so that the front sealing plate and the rear sealing plate are limited, thereby achieving the purpose of limiting the rotation angle of the valve plate, and effectively ensuring the sealing effect of the valve body and the valve plate.

[0029] 3. By setting a negative pressure component, when the front sealing plate and the rear sealing plate are respectively fitted with the expansion section and the contraction section, the negative pressure generated by the airbag whose expansion is delayed by the limiting plate acts on the notch through the hinge plate. Since the notch is fitted with the deformation section, the negative pressure causes the deformation section to be recessed toward the inside of the notch, thereby effectively improving the sealing effect. At the same time, the suction force generated by the negative pressure further limits the angle of the valve plate, thereby effectively ensuring the sealing effect between the valve body and the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the rear view angle of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the sealing sleeve part of the present invention;

[0033] Figure 4 For the present invention Figure 3 A magnified schematic diagram of point A;

[0034] Figure 5 It is a structural schematic diagram of the transmission component part of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the regulating component part of the present invention;

[0036] Figure 7 For the present invention Figure 3 An enlarged schematic diagram of point B;

[0037] Figure 8 It is a structural schematic diagram of the valve plate of the present invention in an open state.

[0038] In the figure: 1. valve body; 2. electric output device; 3. valve stem; 4. valve plate; 401. through groove; 5. sealing sleeve; 501. expansion section; 502. transition section; 503. contraction section; 504. deformation section; 6. transmission assembly; 601. driving gear; 6011. driving wheel; 6012. upper teeth; 6013. lower teeth; 602. lower gear; 603. transmission rod; 6031. upper threaded section; 6032. lower threaded section; 604. upper gear; 7. adjustment assembly; 701. slider; 702. card plate; 703. hinge rod; 704. hinge plate; 705. spring; 8. sealing element; 801. front sealing plate; 802. rear sealing plate; 803. notch; 9. negative pressure assembly; 901. airbag; 902. limit plate. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solution of the embodiment of the present invention in conjunction with the drawings of the embodiment of the present invention, so that its working state and structural features are more detailed. Obviously, the described embodiment is only a partial embodiment of the present invention, not a complete embodiment. Based on the embodiment of the present invention, other embodiments obtained by ordinary technicians in this field without making any creativity belong to the protection scope of the present invention.

[0040] See also Figures 1 to 8 The present invention provides a soft-sealed butterfly valve, and the technical solution is as follows:

[0041] A soft-sealed butterfly valve comprises a valve body 1 and an electric output device 2, wherein the electric output device 2 is mounted on the upper side of the valve body 1, and the front and rear ends of the valve body 1 are respectively connected to a water outlet pipe and a water inlet pipe, and further comprises a valve stem 3, a valve plate 4, a sealing sleeve 5, a transmission assembly 6, an adjustment assembly 7, a sealing member 8 and a negative pressure assembly 9, wherein the valve stem 3 is connected to the middle part of the valve body 1, and the valve plate 4 is connected to the outer surface of the valve stem 3, and the rotation of the valve stem 3 drives the valve plate 4 to rotate, and the sealing sleeve 5 is connected to the inner cavity of the valve body 1, and when the valve plate 4 rotates to be parallel to the front surface of the valve body 1, the valve plate 4 and the sealing sleeve 5 push the inner cavity of the valve body 1 into the inner cavity of the valve body 1. The transmission assembly 6 is connected to the upper end of the valve stem 3 and is connected to the electric output device 2. The adjusting assembly 7 is connected to the middle of the valve stem 3. The sealing member 8 is connected to the adjusting assembly 7. The negative pressure assembly 9 is connected to the inner cavity of the valve plate 4. The electric output device 2 drives the valve plate 4 to fit the sealing sleeve 5 through the transmission assembly 6. After the valve plate 4 and the sealing sleeve 5 are fitted, the transmission assembly 6 switches the power of the electric output device 2 to the adjusting assembly 7. The adjusting assembly 7 drives the sealing member 8 to fit on the sealing sleeve 5. The sealing member 8 adsorbs the sealing sleeve 5 under the action of the negative pressure assembly 9.

[0042] Through the above solution, after the valve plate 4 is closed, the adjusting assembly 7 can make the sealing member 8 fit with the sealing sleeve 5, thereby increasing the total area of ​​the sealing surface of the butterfly valve, thereby achieving the purpose of improving the sealing effect.

[0043] As an embodiment of the present invention, refer to Figure 3 , Figure 4 and Figure 8 The sealing sleeve 5 includes an expansion section 501, a transition section 502 and a contraction section 503. The expansion section 501, the transition section 502 and the contraction section 503 are sequentially connected to the inner wall of the valve body 1 from front to back. After the valve plate 4 rotates to be parallel to the front end of the valve body 1, the side wall of the valve plate 4 fits with the transition section 502 to complete the separation of the front and rear ends of the inner cavity of the valve body 1. The inner diameter value of the expansion section 501 is greater than the inner diameter value of the contraction section 503. When the water flows, the water flows from the contraction section 503 to the expansion section 501, thereby reducing the water flow and thus reducing the flip The water pressure of the valve plate 4 after the rotation effectively reduces the impact force of the water flow on the valve stem 3 and improves the stability of the valve stem 3. The longitudinal cross-section of the transition section 502 is truncated cone-shaped. The large and small ends of the transition section 502 are respectively connected to the expansion section 501 and the contraction section 503. The outer edge shape of the valve plate 4 is adapted to the truncated cone shape of the transition section 502. After the valve plate 4 is turned over, it can fit well with the transition section 502 to achieve a good sealing effect. The transmission assembly 6 includes a driving gear 601, a lower gear 602, a transmission rod 603 and an upper gear 604. The driving gear 601 is connected to the power output end of the electric output device 2, the lower gear 602 is connected to the top of the valve stem 3, the transmission rod 603 is connected to the inner side of the valve stem 3, and the upper gear 604 is connected to the top of the transmission rod 603. The electric output device 2 can drive the lower gear 602 and the upper gear 604 to rotate through the driving gear 601. The driving gear 601 includes a driving wheel 6011, upper teeth 6012 and lower teeth 6013. The driving wheel 6011 is connected to the power output end of the electric output device 2. The upper teeth 6012 and the lower teeth 6013 are connected to the upper teeth 6013. 12 is connected to the upper side of the outer surface of the driving wheel 6011, and the upper teeth 6012 cover half of the upper side of the outer surface of the driving wheel 6011. The lower teeth 6013 are connected to the lower side of the outer surface of the driving wheel 6011, and the lower teeth 6013 cover the other half of the lower side of the outer surface of the driving wheel 6011. The upper teeth 6012 and the lower teeth 6013 are respectively engaged with the upper gear 604 and the lower gear 602. A friction brake is provided on the upper side of the outer surface of the valve stem 3. When the driving gear 601 is not engaged with the lower gear 602, the valve stem 3 is limited by the friction brake.

[0044] By setting the transmission assembly 6, when the electric output device 2 outputs power, the driving wheel 6011 drives the upper teeth 6012 and the lower teeth 6013 to rotate, and the upper teeth 6012 and the lower teeth 6013 have different coverage ranges, so that when the upper teeth 6012 are meshed with the upper gear 604, the lower teeth 6013 are not meshed with the lower gear 602, and then when the valve plate 4 is opened, the power of the electric output device 2 causes the upper teeth 6012 to first drive the transmission rod 603 to rotate through the upper gear 604, and the lower teeth 6013 then drives the valve stem 3 to rotate through the lower gear 602, so as to achieve the adjustment of the seal 8 position before closing the valve plate 4. The purpose of the arrangement is to effectively avoid the friction between the seal 8 and the sealing sleeve 5. When the valve plate 4 is closed, the lower teeth 6013 first drive the valve stem 3 to rotate through the lower gear 602, and then the upper teeth 6012 drive the transmission rod 603 to rotate through the upper gear 604, thereby realizing the docking of the seal 8 and the sealing sleeve 5 after the valve plate 4 is closed. By delaying the adjustment of the seal 8, the friction between the seal 8 and the sealing sleeve 5 is reduced, and the service life of the seal 8 and the sealing sleeve 5 is improved. At the same time, the docking of the sealing sleeve 5 and the seal 8 can form a stable support, thereby reducing the force on the valve stem 3, and effectively improving the stability of the docking between the valve plate 4 and the transition section 502.

[0045] As an embodiment of the present invention, refer to Figure 5 , Figure 6 , Figure 7 and Figure 8, an upper thread segment 6031 and a lower thread segment 6032 are distributed in the middle of the transmission rod 603, and the upper thread segment 6031 and the lower thread segment 6032 are mutually reverse threads. The adjustment component 7 includes a slider 701, a card plate 702, a hinge rod 703, a hinge plate 704 and a spring 705. The two sliders 701 are respectively connected to the upper thread segment 6031 and the lower thread segment 6032. When the transmission rod 603 rotates, the two sliders 701 move in the opposite direction. The card plate 702 is connected to the rear end of the slider 701. There are two card plates 702. The two card plates 702 are respectively connected to the two sliders 701. The two hinge rods 703 are respectively connected to the left and right sides of the inner cavity of the valve plate 4. The two groups of hinge plates 704 are respectively connected to the two On the outer surface of the hinge rod 703, there are two hinge plates 704 in a group. Two hinge plates 704 are connected to the surface of one hinge plate 704. The spring 705 is connected between the two hinge plates 704. In the initial state, the spring 705 is not subjected to force. When the clamping plate 702 squeezes the hinge plate 704 to rotate, the spring 705 is in an open state. When the clamping plate 702 does not squeeze the hinge plate 704, the spring 705 pulls the hinge plate 704 to fit with the clamping plate 702. The slider 701 is triangular, and then the two side edges of the slider 701 are respectively in contact with the two hinge plates 704. The front and rear sides of the valve plate 4 are provided with through grooves 401. The hinge plate 704 is "L" shaped. The short end of the hinge plate 704 passes through the through groove 401. The rotation trajectory of the hinge plate 704 Matching with the through slot 401, the hinge plate 704 is a hollow structure, thereby reducing the weight of the hinge plate 704, making it easier for the spring 705 to drive the hinge plate 704 to fit with the slider 701, and the sealing member 8 comprises a front sealing plate 801 and a rear sealing plate 802, wherein the front sealing plate 801 is connected to the front end of the left hinge plate 704 passing through the through slot 401, and the rear sealing plate 802 is connected to the rear end of the right hinge plate 704 passing through the through slot 401, and the outer diameters of the front sealing plate 801 and the rear sealing plate 802 are respectively equal to the diameters of the outer edges of the front and rear sides of the valve plate 4, and then when the front sealing plate 801 and the rear sealing plate 802 are rotated to a specified angle value, they overlap with the outer edge of the valve plate 4, thereby effectively improving the force of the front sealing plate 801 and the rear sealing plate 802. The area is improved, and the stable supporting effect of the front sealing plate 801 and the rear sealing plate 802 on the valve plate 4 is improved. The front sealing plate 801 and the rear sealing plate 802 are both arc-shaped. The number of the front sealing plate 801 and the rear sealing plate 802 is two, and the sum of the arc angles of the two front sealing plates 801 is greater than 180°, and the sum of the arc angles of the two rear sealing plates 802 is greater than 180°. The sum of the angles of the two front sealing plates 801 and the rear sealing plates 802 is greater than 360°, so that the inner cavity of the valve body 1 can be completely covered, and the sealing effect is effectively improved. The negative pressure component 9 includes an airbag 901 and a limiting plate 902. The airbag 901 is located on the upper side of the inner cavity of the valve plate 4, and the two ends of the airbag 901 are respectively connected to the hinge plates 704 on the left and right sides.The airbag 901 is connected with the hinge plates 704 on the left and right sides of the upper side. Under the negative pressure state, the inner cavity of the upper hinge plate 704 can be filled with water, so that the tilted end of the upper hinge plate 704 has a tendency to rotate downward, which effectively improves the resetting efficiency of the upper hinge plate 704 when the clamping plate 702 is lost. The limiting plate 902 is connected to the inner cavity of the valve plate 4, and the limiting plate 902 is arc-shaped. The airbag 901 is arc-shaped and the outer edge is wavy. When the airbag 901 contracts, the outer edge of the airbag 901 contacts the limiting plate 902. The middle parts of the expansion section 501 and the contraction section 503 are connected with the deformation section 504. The outer edges of the front sealing plate 801 and the rear sealing plate 802 are provided with notches 803. The plate 801 and the rear sealing plate 802 are both connected to the upper hinge rod 703, the upper front sealing plate 801 is connected to the lower front sealing plate 801, and the upper rear sealing plate 802 is connected to the lower rear sealing plate 802. The distance between the front and rear ends of the notch 803 is smaller than the distance between the front and rear ends of the deformation section 504. Then, through the expansion of the airbag 901, the notches 803 of the front sealing plate 801 and the rear sealing plate 802 can form suction on the deformation section 504, so that the deformation section 504 is partially recessed into the notch 803, thereby effectively improving the sealing effect. The front sealing plate 801 and the rear sealing plate 802 are both made of hard materials, and the expansion section 501 and the contraction section 503 are both made of hard materials.

[0046] By setting the adjustment component 7, when the valve is opened, the rotation of the transmission rod 603 can drive the upper and lower sliders 701 to move in the opposite direction, so that the clamping plate 702 moves, and then the clamping plate 702 drives the sealing member 8 to rotate through the hinge plate 704, so that the sealing member 8 shrinks to a position close to the center of the valve plate 4 surface, and then the sealing sleeve 5 will not contact the sealing member 8 when the valve plate 4 rotates. When the valve is closed, the valve first fits with the transition section 502, and then drives the transmission rod 603 to rotate and adjust the position of the sealing member 8, and drives the sealing member 8 to rotate through the hinge plate 704, so that the sealing member 8 fits with the inner wall of the sealing sleeve 5. Since the valve stem 3 of the eccentric butterfly valve deviates from the center point of the valve plate 4, the valve plate 4 The force point of 4 is on the right side in the figure. The valve plate 4 is affected by the water pressure, and the force of the right side's forward deviation is greater than the force of the left side's backward deviation. By setting the front sealing plate 801 on the left side of the front end of the valve plate 4, when the valve plate 4 is subjected to force, the front sealing plate 801 is in rigid contact with the expansion section 501 to bear force, thereby reducing the rotation tendency of the valve stem 3. At the same time, the force point of the valve plate 4 is on the right side, and the right side of the valve plate 4 is deflected forward. By setting the rear sealing plate 802 on the right side of the rear side of the valve plate 4, when the valve plate 4 rotates, the valve plate 4 will make the rear sealing plate 802 in rigid contact with the contraction section 503 to bear force, thereby reducing the rotation tendency of the valve stem 3, and effectively improving the stability of the valve stem 3.

[0047] When the butterfly valve is closed, the seal 8 is in rigid contact with the sealing sleeve 5, so that when the surface of the valve plate 4 is unevenly stressed and loose around the valve stem 3, a rigid supporting force can be given to the side of the valve plate 4, thereby ensuring the sealing effect of the butterfly valve.

[0048] In order to avoid the wear of the seal 8 caused by contact with the sealing sleeve 5 when the butterfly valve is opened and closed, the seal 8 is first removed when the butterfly valve is opened, and the seal 8 is then fitted with the sealing sleeve 5 for support after the butterfly valve is closed:

[0049] When the butterfly valve is opened and water flows, the electric output device 2 transmits power to the active gear 601, and the active gear 601 transmits power to the upper gear 604 through the upper teeth 6012, thereby driving the transmission rod 603 to rotate. When the transmission rod 603 rotates, the upper threaded section 6031 and the lower threaded section 6032 respectively drive the two sliders 701 to move away from each other, and the slider 701 drives the clamping plate 702 to move and squeeze the hinge plate 704, so that the hinge plate 704 rotates around the hinge rod 703. When the hinge plate 704 rotates, it drives the front sealing plate 801 and the rear sealing plate 802 to close to the center of the valve plate 4. At this time, the active gear 601 transmits power to the lower gear 602 through the lower teeth 6013, thereby driving the valve stem 3 to rotate. The rotation of the valve stem 3 drives the valve plate 4 to open. At this time, the transmission rod 603 is not subjected to force and rotates with the valve stem 3;

[0050] When the butterfly valve is closed, the lower teeth 6013 mesh with the lower gear 602, and when it is closed, the valve stem 3 drives the valve plate 4 to rotate. When the valve plate 4 is closed, the upper teeth 6012 mesh with the upper gear 604 and drive the upper gear 604 to rotate. The upper gear 604 drives the sliders 701 to move closer to each other through the transmission rod 603, and then the hinge plate 704 is separated from the clamping plate 702 and affected by the spring 705, and the hinge plate 704 is reset and moved closer.

[0051] After the butterfly valve is closed, since the rotation axis of the valve plate 4 deviates from the center of the valve plate 4, when the water pressure acts on the valve plate 4, the two sides of the pressure surface of the valve plate 4 are located on the two sides of the valve stem 3 and are subjected to uneven force, which will cause the valve stem 3 to tend to rotate in the direction with greater force. Therefore, by setting the sealing member 8, when the valve plate 4 is closed, the two sides of the valve plate 4 are limited, the support points of the valve plate 4 are increased, and the rotation force of the valve stem 3 is reduced. Specifically, by setting the front sealing plate 801 and the rear sealing plate 802, when the valve plate 4 is closed, the front sealing plate 801 is in contact with the left side of the front end surface of the valve plate 4, and the rear sealing plate 802 is in contact with the right side of the rear end surface of the valve plate 4. When the valve plate 4 has a tendency to rotate, the front sealing plate 801 is rigidly supported by the expansion section 501, and the rear sealing plate 802 is rigidly supported by the contraction section 503, which will form a supporting force on the valve plate 4 to ensure the stability of the valve plate 4.

[0052] When the butterfly valve is closed, in order to improve the sealing effect of the butterfly valve, the lateral sealing area of ​​the butterfly valve is increased to ensure the sealing effect of the butterfly valve. Specifically, when the butterfly valve is opened, the rotation of the hinge plate 704 will cause the airbag 901 to shrink. After the hinge plate 704 is reset, the airbag 901 tends to open. The airbag 901 forms suction on the notch 803 through the hinge plate 704. The limit plate 902 slows down the opening speed of the airbag 901, and then after the front sealing plate 801 and the rear sealing plate 802 are respectively fitted with the expansion section 501 and the contraction section 503, negative pressure is formed at the notch 803, so that the notch 803 forms negative pressure on the deformation section 504, and then the deformation section 504 is recessed into the notch 803, thereby achieving the purpose of improving the sealing effect.

[0053] Although the embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes and modifications may be made to the embodiments to obtain other effects with an understanding of the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft-sealed butterfly valve, comprising a valve body (1) and an electric output device (2), wherein the electric output device (2) is mounted on the upper side of the valve body (1), and is characterized in that: The valve stem (3) further comprises a valve plate (4), a sealing sleeve (5), a transmission assembly (6), an adjusting assembly (7), a sealing member (8) and a negative pressure assembly (9), wherein the valve stem (3) is connected to the middle part of the valve body (1), the valve plate (4) is connected to the outer surface of the valve stem (3), the sealing sleeve (5) is connected to the inner cavity of the valve body (1), the transmission assembly (6) is connected to the upper end of the valve stem (3) and is connected to the electric output device (2), the adjusting assembly (7) is connected to the middle part of the valve stem (3), and the sealing member (8) is connected to the inner cavity of the valve body (1). The negative pressure component (9) is connected to the inner cavity of the valve plate (4); the electric output device (2) drives the valve plate (4) to fit with the sealing sleeve (5) through the transmission component (6); after the valve plate (4) and the sealing sleeve (5) are fitted, the transmission component (6) switches the power of the electric output device (2) to the adjustment component (7); the adjustment component (7) drives the sealing member (8) to fit on the sealing sleeve (5); and the sealing member (8) adsorbs the sealing sleeve (5) under the action of the negative pressure component (9).

2. A soft-sealed butterfly valve according to claim 1, characterized in that: The sealing sleeve (5) comprises an expansion section (501), a transition section (502) and a contraction section (503); the expansion section (501), the transition section (502) and the contraction section (503) are sequentially connected to the inner wall of the valve body (1) from front to back; the inner diameter of the expansion section (501) is greater than the inner diameter of the contraction section (503); the longitudinal cross-section of the transition section (502) is truncated cone-shaped; the large and small ends of the transition section (502) are respectively connected to the expansion section (501) and the contraction section (503).

3. A soft-sealed butterfly valve according to claim 2, characterized in that: The transmission assembly (6) comprises a driving gear (601), a lower gear (602), a transmission rod (603) and an upper gear (604); the driving gear (601) is connected to the power output end of the electric output device (2); the lower gear (602) is connected to the top of the valve stem (3); the transmission rod (603) is connected to the inner side of the valve stem (3); and the upper gear (604) is connected to the top of the transmission rod (603).

4. A soft-sealed butterfly valve according to claim 3, characterized in that: The driving gear (601) comprises a driving wheel (6011), upper teeth (6012) and lower teeth (6013); the driving wheel (6011) is connected to the power output end of the electric output device (2); the upper teeth (6012) are connected to the rear side of the upper side of the outer surface of the driving wheel (6011); the lower teeth (6013) are connected to the front side of the lower side of the outer surface of the driving wheel (6011); the upper teeth (6012) and the lower teeth (6013) are respectively meshed with the upper gear (604) and the lower gear (602).

5. The soft-sealed butterfly valve according to claim 3, characterized in that: An upper threaded section (6031) and a lower threaded section (6032) are distributed above and below the middle of the transmission rod (603), and the upper threaded section (6031) and the lower threaded section (6032) are mutually inversely threaded. The adjustment component (7) comprises a slider (701), a clamping plate (702), a hinge rod (703), a hinge plate (704) and a spring (705). The two sliders (701) are respectively connected to the upper threaded section (6031) and the lower threaded section (6032), the clamping plate (702) is connected to the rear end of the slider (701), the two hinge rods (703) are respectively connected to the left and right sides of the inner cavity of the valve plate (4), the two groups of hinge plates (704) are respectively connected to the outer surfaces of the two hinge rods (703), the number of hinge plates (704) in one group is two, the spring (705) is connected between the two hinge plates (704), and the slider (701) is triangular.

6. A soft-sealed butterfly valve according to claim 5, characterized in that: The valve plate (4) is provided with through grooves (401) on both the front and rear sides; the hinge plate (704) is in an "L" shape; the short end of the hinge plate (704) passes through the through groove (401); the rotation trajectory of the hinge plate (704) is adapted to the through groove (401); and the hinge plate (704) is a hollow structure.

7. A soft-sealed butterfly valve according to claim 6, characterized in that: The sealing member (8) comprises a front sealing plate (801) and a rear sealing plate (802), wherein the front sealing plate (801) is connected to the front end of the left hinge plate (704) passing through the through groove (401), and the rear sealing plate (802) is connected to the rear end of the right hinge plate (704) passing through the through groove (401), and the outer diameters of the front sealing plate (801) and the rear sealing plate (802) are respectively equal to the diameters of the outer edges of the front and rear sides of the valve plate (4), and the front sealing plate (801) and the rear sealing plate (802) are both arc-shaped, and the number of the front sealing plates (801) and the rear sealing plates (802) are both two, and the sum of the arc angles of the two front sealing plates (801) is greater than 180°, and the sum of the arc angles of the two rear sealing plates (802) is greater than 180°.

8. A soft-sealed butterfly valve according to claim 7, characterized in that: The negative pressure component (9) comprises an airbag (901) and a limiting plate (902); the airbag (901) is located on the upper side of the inner cavity of the valve plate (4); the two ends of the airbag (901) are respectively connected to the hinge plates (704) on the left and right sides; the limiting plate (902) is connected to the inner cavity of the valve plate (4); the limiting plate (902) is arc-shaped; the airbag (901) is arc-shaped and has a wavy outer edge.

9. A soft-sealed butterfly valve according to claim 7, characterized in that: The middle parts of the expansion section (501) and the contraction section (503) are both connected to a deformation section (504); the outer edges of the front sealing plate (801) and the rear sealing plate (802) are both provided with notches (803); the front sealing plate (801) and the rear sealing plate (802) are both connected to the upper hinge rod (703); and the distance between the front and rear ends of the notch (803) is smaller than the distance between the front and rear ends of the deformation section (504).

10. A soft-sealed butterfly valve according to claim 9, characterized in that: The front sealing plate (801) and the rear sealing plate (802) are both made of hard materials, and the expansion section (501) and the contraction section (503) are both made of hard materials.

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