High-temperature flue gas ventilation butterfly valve

Abstract

The utility model relates to the technical field of eccentric butterfly valves, and discloses a high-temperature flue gas ventilation butterfly valve which comprises a valve body, a bottom cover is fixedly installed at the bottom of the valve body, a gasket is detachably installed in the bottom cover through a first fixing screw, a lining is fixedly installed on the side, close to the center of the valve body, of the gasket, and the lining is detachably installed on the bottom cover through a second fixing screw. A fixing sleeve is connected between the lining and the gasket in a clamped mode, a valve rod penetrates through the inner wall of the valve body and is rotationally installed, and a valve plate penetrates through the valve rod and is fixedly installed on the valve rod. According to the butterfly valve, the valve rod, the valve plate and the valve body are eccentrically arranged, so that the center line of the valve plate and the center line of the valve seat form two included angles on the long side and the short side of the valve plate, the mechanical abrasion between the valve plate and the valve body can be reduced when the butterfly valve is opened and closed, and in the closing process of the butterfly valve, the valve plate is completely driven by an external hand wheel to rotate, so that the safety of the butterfly valve is improved. Therefore, impact on the valve plate in the high-temperature and high-pressure flue gas transportation process is reduced, and the service life of the butterfly valve is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to eccentric butterfly valve technical field, concretely is a kind of high-temperature flue gas ventilation butterfly valve. BACKGROUND

[0002] Butterfly valve is a kind of valve, and the disc-shaped butterfly plate is used as the opening and closing part, rotates around the valve shaft to achieve the purpose of opening and closing, it is simple in structure, small in size, light in weight, usually composed of valve body, butterfly plate, valve shaft, sealing ring and other components, butterfly valve controls the passage of fluid by rotating butterfly plate, when butterfly plate is parallel to valve body, valve is in full open state, fluid can pass smoothly;When butterfly plate is perpendicular to valve body, valve is in full closed state, fluid is cut off.

[0003] The existing butterfly valve is usually used in normal temperature, low pressure and occasions with low sealing requirement, which greatly limits the use scene of butterfly valve, and simply strengthening its sealing or high-temperature resistance makes the production cost of butterfly valve increase, and the use efficiency is low when dealing with high-temperature flue gas transport medium;In view of this, we propose a kind of high-temperature flue gas ventilation butterfly valve. CONTENT OF UTILITY MODEL

[0004] The utility model aims at providing a kind of high-temperature flue gas ventilation butterfly valve to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of high-temperature flue gas ventilation butterfly valve, including valve body, the bottom of the valve body is fixedly installed with bottom cover, the inside of the bottom cover is detachably installed with gasket by fixed screw one, the gasket is fixedly installed with bushing near the center side of valve body, fixed sleeve is clamped between the bushing and gasket, the inner wall of the valve body is rotatably installed with valve stem, the valve stem is rotatably installed with valve plate, the side wall of the valve plate is detachably installed with pressing plate and sealing ring by fixed screw two, flat key one is arranged between the valve plate and valve stem, the top inner wall of the valve body is fixedly installed with split ring, the top of the split ring is fixedly installed with packing pad, the top of the packing pad is provided with packing, the top of the valve body is fixedly installed with support, the inner wall of the support is detachably installed with packing gland by nut one and stud one, the support between packing gland and is detachably installed with nut two and stud two, the top inner wall of the support is provided with flat key two, the top of the valve stem is rotatably connected with hand wheel, and the hand wheel is rotatably installed on the top side wall of the support.

[0006] Preferably, the valve stem and the valve body are eccentrically arranged, and the back of the valve plate is provided with a triangular connecting piece, the triangular connecting piece is connected with the valve stem through the flat key one, so that the rotation of the valve stem can drive the triangular connecting piece and the valve plate to rotate more stably.

[0007] Preferably, the axis of the valve stem is eccentric to the center line of the valve plate, and the axis of the valve stem is eccentric to the center line of the valve body, thereby improving the ability of the valve stem and the valve plate to resist the impact force of the transport medium during use of the butterfly valve.

[0008] Preferably, an annular groove is formed in the side wall of the valve plate, the annular groove is matched with the sealing ring, and a threaded hole matched with the second fixing screw is formed in the inner wall of the bottom of the annular groove, and a through hole with a diameter larger than the outer diameter of the second fixing screw is formed in the center of the pressing plate, so that the pressing plate can increase the contact area between the second fixing screw and the sealing ring.

[0009] Preferably, the nut one and the nut two are hexagonal nuts, and the top inner wall of the bracket is provided with a hexagonal hole for mounting the nut one and the nut two, so as to fix the nut one and the nut two, and then cooperate with the stud one and the stud two to fix the packing gland.

[0010] Preferably, the left and right outer walls of the valve plate are fixedly installed with sealing strips, small suction cups are formed in the side walls of the sealing strips, and a sealing ring is fixedly installed on the inner wall of the valve body.

[0011] Preferably, the number of the sealing strips is two groups, the valve plate is elliptical, and the two groups of sealing strips are mirror image arranged on the left and right arc convex parts of the valve plate, the number of the small suction cups is multiple groups, and the multiple groups of small suction cups are evenly distributed in a wave shape on the side of the sealing strip, and the corresponding small suction cups on the two groups of sealing strips are symmetrically arranged on the left and right sides of the valve plate with the center of the valve plate as the center.

[0012] Compared with the prior art, the high-temperature flue gas ventilation butterfly valve has the following advantages

[0013] Beneficial effects:

[0014] 1、The high-temperature flue gas ventilation butterfly valve, by the mutual eccentric arrangement between the valve stem, the valve plate and the valve body, the center lines of the valve plate and the valve seat form two included angles on the long side and the short side of the valve plate, so that the mechanical wear between the valve plate and the valve body can be reduced when the butterfly valve is opened and closed, and in the process of closing the butterfly valve, the rotation of the valve plate is completely driven by the external hand wheel, thereby reducing the impact on the valve plate during the high-temperature and high-pressure flue gas transportation process, and ensuring the service life of the butterfly valve.

[0015] 2. The high-temperature flue gas ventilation butterfly valve, by setting up the sealing band and the small sucking disc of the wavy line array, when the valve plate is closed, due to the eccentricity between the valve rod and the valve plate, the valve rod can realize the opening and closing of the valve body without affecting the sealing ring when rotating, and through the setting of multiple small sucking discs, the connection between the sealing ring and the sealing band can be more stable, the ability of the valve plate to resist the impact of the transportation medium is enhanced, the use safety and service life of the butterfly valve are guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the schematic diagram of the main body structure of the utility model;

[0017] Fig. 2 It is the schematic diagram of the front cross section structure of the utility model;

[0018] Fig. 3 It is the schematic diagram of the side cross section structure of the utility model;

[0019] Fig. 4 It is the schematic diagram of the valve body cross section structure in the second embodiment of the utility model;

[0020] Fig. 5 It is the schematic diagram of the valve plate local expansion structure in the second embodiment of the utility model;

[0021] Fig. 6 It is the schematic diagram of the valve plate structure in the second embodiment of the utility model.

[0022] In the drawing: 1, fixed screw one;2, bottom cover;3, gasket;4, bushing;5, valve body;6, valve rod;7, sealing ring;8, pressing plate;9, fixed screw two;10, flat key one;11, valve plate;12, split ring;13, packing pad;14, packing;15, nut one;16, stud one;17, support;18, flat key two;19, packing gland;20, nut two;21, stud two;22, fixed sleeve;71, sealing band;72, small sucking disc;73, sealing ring. DETAILED DESCRIPTION

[0023] Example one

[0024] As Figs. 1-3The utility model provides a technical scheme: a high temperature flue gas ventilation butterfly valve, including valve body 5, the bottom fixed mounting of valve body 5 has bottom cover 2, the inside of bottom cover 2 is detachably installed with gasket 3 through fixed screw one 1, gasket 3 is fixedly installed with bushing 4 near valve body 5 centre one side, fixed sleeve 22 is clamped between bushing 4 and gasket 3, the inner wall of valve body 5 is installed with valve stem 6, valve stem 6 is installed with valve plate 11, the sidewall of valve plate 11 is detachably installed with pressing plate 8 and sealing ring 7 through fixed screw two 9, flat key one 10 is arranged between valve plate 11 and valve stem 6, the top inner wall of valve body 5 is fixedly installed with split ring 12, the top of split ring 12 is fixedly installed with packing 13, the top of packing 13 is provided with packing 14, the top of valve body 5 is fixedly installed with support 17, the inner wall of support 17 is detachably installed with packing gland 19 through nut one 15 and stud one 16, nut two 20 and stud two 21 are detachably installed between packing gland 19 and support 17, the top inner wall of support 17 is provided with flat key two 18, the top end of valve stem 6 is drivingly connected with hand wheel, and the hand wheel is rotatably installed on the top sidewall of support 17.

[0025] In an embodiment of the utility model, the valve plate 11 is arranged in the internal cavity of the valve body 5, and the valve stem 6 is arranged eccentrically between the valve body 5, and the back of the valve plate 11 is provided with a triangular connecting piece, which is connected with the valve stem 6 through the flat key one 10, so that the rotation of the valve stem 6 can drive the triangular connecting piece and the valve plate 11 to rotate more stably, thereby ensuring the stable adjustment of the butterfly valve. In addition, a hole is formed in the bottom of the valve body 5, which is used for installing the bushing 4, and the hole penetrates the bottom inner wall of the valve body 5, and the bottom cover 2 is arranged directly below the hole, thereby ensuring the sealing of the bottom of the valve body 5 under the blocking of the gasket 3 and the fixed sleeve 22, and the stable assembly state of the valve stem 6 can be ensured, thereby facilitating the user to open and close the butterfly valve and adjust it. Furthermore, a transmission assembly is arranged in the top of the support 17, which connects the hand wheel and the top end of the valve stem 6, so that the user can rotate the hand wheel while cooperating with the transmission assembly to drive the valve stem 6 to rotate, thereby cooperating with the valve plate 11 to open and close the butterfly valve.

[0026] In addition, the axis of the valve rod 6 is eccentric to the center line of the valve plate 11 and the axis of the valve rod 6 is eccentric to the center line of the valve body 5, so that the valve rod 6 and the valve plate 11 have the ability to resist the impact force of the medium during the use of the butterfly valve, so that the butterfly valve forms a three-eccentric sealing structure. When the butterfly valve is in a fully open state, the sealing surface of the valve plate 11 is completely separated from the sealing surface inside the valve body 5. Due to the formation of the angle between the center line of the valve body 5 and the center line of the sealing surface of the valve plate 11, the long and short radii of the valve plate 11 change, and the tangent of the rotation track of the sealing surface of the valve plate 11 forms two angles with the sealing surface of the valve body 5. Because of the existence of the two angles, when the butterfly valve is opened, the sealing surface of the valve plate 11 will immediately separate from the sealing surface of the valve body 5 at the moment of opening. When closing, only at the moment of closing, the sealing surface of the valve plate 11 will contact and press the sealing surface of the valve body 5, so as to completely eliminate the mechanical wear and tear between the two sealing surfaces of the sealing pair of the valve plate 11 during opening and closing. When the butterfly valve is closed, the sealing pressure between the two sealing surfaces of the sealing pair can be generated by the driving torque applied to the rotating shaft of the valve plate 11. Not only the sealing between the two sealing surfaces of the sealing pair caused by the aging, cold flow, and elastic failure of the elastic material of the elastic seat in the conventional butterfly valve is eliminated, but also the sealing pressure can be adjusted by changing the driving torque, so that the sealing performance and service life of the three-eccentric sealing butterfly valve are greatly improved.

[0027] In addition, an annular groove is formed in the side wall of the valve plate 11, which is matched with the sealing ring 7. Threaded holes are formed in the inner wall of the bottom of the annular groove, which are matched with the fixing screws 9. A through hole is formed in the center of the pressing plate 8, which has a diameter larger than the outer diameter of the fixing screws 9, so that the pressing plate 8 can increase the contact area between the fixing screws 9 and the sealing ring 7, so that the sealing ring 7 can be replaced while maintaining a stable installation state during assembly.

[0028] Further, the nut 15 and the nut 20 are hexagonal nuts, and the top inner wall of the bracket 17 is provided with a hexagonal hole for installing the nut 15 and the nut 20, so as to fix the nut 15 and the nut 20, and then fix the packing gland 19 by cooperating with the stud 16 and the stud 21. Specifically, the inside of the bracket 17 is provided with a packing cavity, and the bottom of the packing cavity is paved with a packing pad 13 to block the bottom position. By filling the packing in the packing cavity, the wear of the valve rod 6 is reduced, and the stability and safety of the butterfly valve are ensured. The arc-shaped inner wall of the valve body 5 is provided with an auxiliary ring matched with the sealing ring 7 to ensure the stability of the butterfly valve when it is closed.

[0029] Example two

[0030] Please refer to the drawings in the specification Figs. 4-6In the embodiment of the utility model, the left and right sides of valve plate 11 are fixedly installed with sealing strips 71, small sucking discs 72 are arranged on the side walls of sealing strips 71, and sealing rings 73 are fixedly installed on the inner walls of valve body 5.

[0031] In the embodiment of the utility model, the number of sealing strips 71 is set to two groups, valve plate 11 is set to an oval shape, and the two groups of sealing strips 71 are mirror image arranged on the left and right sides of the arc-shaped convex parts of valve plate 11, in addition, the number of small sucking discs 72 is set to multiple groups, and the multiple groups of small sucking discs 72 are evenly distributed in a wave shape on the side surfaces of sealing strips 71, and the corresponding small sucking discs 72 arranged on the two groups of sealing strips 71 are symmetrically arranged on the left and right sides of valve plate 11 with the center of valve plate 11 as the center, further, the number of sealing rings 73 is set to two groups, and the cross section of sealing ring 73 is set to an isosceles right trapezoidal shape, so as to improve the fit between sealing strip 71 and sealing ring 73, and further ensure the sealing performance of valve plate 11 when closing, specifically, when valve plate 11 is closed, due to the eccentric arrangement between valve rod 6 and valve plate 11, valve rod 6 can realize the opening and closing of valve body 5 without affecting sealing ring 73 when rotating, and through the arrangement of multiple groups of small sucking discs 72, the connection between sealing ring 73 and sealing strip 71 can be more stable, the ability of valve plate 11 to resist the impact of the transportation medium is enhanced, and the use safety and service life of the butterfly valve are ensured.

[0032] In the utility model, when in use, through the mutual eccentric arrangement between valve rod 6, valve plate 11 and valve body 5, the center lines of valve plate 11 and valve body 5 form two included angles on the long side and the short side of valve plate 11, so that the mechanical wear between valve plate 11 and valve body 5 can be reduced when the butterfly valve is opened and closed, and in the process of closing the butterfly valve, the rotation of valve plate 11 is completely driven by the external hand wheel, so as to reduce the impact on valve plate 11 in the process of transporting high-temperature and high-pressure flue gas, and ensure the service life of the butterfly valve.

[0033] The foregoing has made a detailed description of the utility model in general, but some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit and principles of the utility model are within the protection scope of the utility model.

Claims

1. A high-temperature flue gas ventilation butterfly valve, comprising a valve body (5), characterized in that: The bottom of the valve body (5) is fixedly mounted with a bottom cover (2), the interior of the bottom cover (2) is detachably mounted with a gasket (3) by means of a fixing screw (1), a bushing (4) is fixedly mounted on the gasket (3) near the center of the valve body (5), a fixing sleeve (22) is clamped between the bushing (4) and the gasket (3), the inner wall of the valve body (5) is penetrated and rotatably mounted with a valve stem (6), the valve stem (6) is penetrated and fixedly mounted with a valve plate (11), the side wall of the valve plate (11) is detachably mounted with a pressure plate (8) and a sealing ring (7) by means of a fixing screw (9), a flat key (10) is provided between the valve plate (11) and the valve stem (6), the top of the valve body (5) is provided with a fixing screw (9), and a fixing screw (10) is provided between the valve plate (11) and the valve stem (6). A split ring (12) is fixedly installed on the inner wall, a stuffing pad (13) is fixedly installed on the top of the split ring (12), a stuffing pad (14) is provided on the top of the stuffing pad (13), a bracket (17) is fixedly installed on the top of the valve body (5), a stuffing gland (19) is detachably installed on the inner wall of the bracket (17) through a nut (15) and a stud (16), a nut (20) and a stud (21) are detachably installed between the stuffing gland (19) and the bracket (17), a flat key (18) is provided on the top inner wall of the bracket (17), and a hand wheel is transmission-connected to the top end of the valve stem (6), and the hand wheel is rotatably installed on the top side wall of the bracket (17).

2. The high-temperature flue gas ventilation butterfly valve according to claim 1, characterized in that: The valve stem (6) and the valve body (5) are eccentrically arranged, and a triangular connector is provided on the back of the valve plate (11), and the triangular connector is connected to the valve stem (6) via a flat key (10).

3. The high-temperature flue gas ventilation butterfly valve according to claim 1, characterized in that: The axis of the valve stem (6) is eccentrically arranged with respect to the center line of the valve plate (11), and the axis of the valve stem (6) is eccentrically arranged with respect to the center line of the valve body (5).

4. The high-temperature flue gas ventilation butterfly valve according to claim 1, characterized in that: An annular groove is provided on the side wall of the valve plate (11), the annular groove is adapted to the sealing ring (7), and a threaded hole adapted to the second fixing screw (9) is provided on the bottom inner wall of the annular groove, and a through hole having a diameter larger than the outer diameter of the second fixing screw (9) is provided at the center of the pressure plate (8).

5. The high-temperature flue gas ventilation butterfly valve according to claim 1, characterized in that: The nut 1 (15) and the nut 2 (20) are both hexagonal nuts, and a hexagonal hole for installing the nut 1 (15) and the nut 2 (20) is provided on the top inner wall of the bracket (17), so as to facilitate fixing the nut 1 (15) and the nut 2 (20).

6. The high-temperature flue gas ventilation butterfly valve according to claim 1, characterized in that: Sealing belts (71) are fixedly mounted on the left and right outer walls of the valve plate (11), small suction cups (72) are provided on the side walls of the sealing belts (71), and a sealing ring (73) is fixedly mounted on the inner wall of the valve body (5).

7. The high-temperature flue gas ventilation butterfly valve according to claim 6, characterized in that: The number of the sealing belts (71) is two, and the valve plate (11) is arranged in an elliptical shape, and the two groups of sealing belts (71) are mirror-imaged and arranged on the arc-shaped protrusions on the left and right sides of the valve plate (11), the number of the small suction cups (72) is multiple, and the multiple groups of small suction cups (72) are uniformly distributed in a wavy shape on the side of the sealing belt (71), and the small suction cups (72) correspondingly arranged on the two groups of sealing belts (71) are symmetrically arranged on the left and right sides of the valve plate (11) with the center of the valve plate (11).

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