CN206786027U - A kind of high temperature butterfly valve door - Google Patents

Abstract

The utility model discloses a high-temperature butterfly valve, which comprises a valve body, a butterfly plate, a valve stem, a valve stem sleeve and a bottom cover. A keyway is arranged axially on the inner wall of the rod connection hole, and a flat key matching the keyway is fixed axially on the valve stem; a sealing ring installation gap is arranged on the butterfly plate aligned with the valve seat, and the sealing ring is installed A metal sealing ring is arranged in the gap, and a spring gland is arranged outside the sealing ring installation gap, and a spring positioning groove is arranged on the inner wall of the spring gland, and a positioning spring is arranged in the spring positioning groove, and the metal sealing ring is positioned relative to the positioning spring. The other end of the seal ring is provided with a seal ring installation groove, and a C-shaped seal ring is arranged in the seal ring installation groove, and the C-type seal ring is connected with the inner wall surface of the seal ring installation gap. The above-mentioned technical proposal has a reasonable structure design, a simple structure, is not easy to swell, has good sealing performance, good safety, and is convenient to use.

Description

A high temperature butterfly valve

technical field

The utility model relates to the technical field of valves, in particular to a high-temperature butterfly valve.

Background technique

Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The structure of the existing butterfly valve generally includes a valve body, a valve stem, a disc plate, a bottom cover, etc., and the valve plate rotates on the inner cavity of the valve body under the action of the valve stem to realize the function of opening or closing the inner cavity of the valve body.

The existing butterfly valve structure still has deficiencies: the existing butterfly valve is under high-temperature or temperature-alternating working conditions, the valve is swollen and cannot be opened due to expansion between parts, and the sealing performance is poor, which is prone to leakage and poor safety. The service life is short; the connection between the valve stem and the butterfly plate is troublesome, and it is inconvenient to assemble and disassemble.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of the utility model is to provide a high-temperature butterfly valve with reasonable structural design, simple structure, not easy to swell, good sealing performance, good safety and convenient use.

In order to achieve the above purpose, the utility model provides the following technical solutions: a high-temperature butterfly valve, including a valve body, a butterfly plate, a valve stem, a valve stem sleeve and a bottom cover, a valve seat is fixedly arranged in the valve body, and the butterfly valve A valve stem connection hole is arranged axially in the plate, a keyway is axially arranged on the inner wall surface of the valve stem connection hole, and a flat key matching the keyway is fixedly arranged on the valve stem in the axial direction. The lower end of the valve stem passes through the connecting hole of the valve stem, and the flat key is connected with the keyway; the butterfly plate is aligned with the valve seat to be provided with a sealing ring installation gap, and a metal sealing ring is arranged in the sealing ring installation gap, and the A spring gland is arranged outside the installation gap of the sealing ring, and a spring positioning groove is arranged on the inner wall of the spring gland, and a positioning spring is arranged in the spring positioning groove, and one end of the positioning spring is connected with the spring gland for positioning. The other end of the spring is connected with the metal sealing ring, and the other end of the metal sealing ring relative to the positioning spring is provided with a sealing ring installation groove, and a C-shaped sealing ring is arranged in the sealing ring installation groove, and the C-shaped sealing ring is connected with the sealing ring. The inner wall surface of the ring installation notch is connected.

By adopting the above technical scheme, the valve stem and the butterfly plate are connected by flat keys, which are easy to assemble and disassemble. There is a radial gap between the butterfly plates. Under high temperature or temperature alternating conditions, it can shrink radially under the action of the positioning spring to ensure that the valve will not swell due to expansion between parts. It can also ensure that the valve is well sealed, not easy to leak, and has a long service life; the structure design is reasonable, the structure is simple, the use is convenient, and the practicability is good.

The utility model is further configured as follows: the spring gland is provided with connecting screws, and the spring gland is connected and fixed with the butterfly plate through the connecting screws. With this setting, the spring gland is conveniently connected and fixed reliably.

The utility model is further configured as follows: the C-shaped sealing ring is a metal sealing ring, and the opening of the C-shaped sealing ring is arranged axially. Through this setting, the C-shaped sealing ring is set reasonably, and the C-shaped sealing ring and the metal sealing ring form two sealing defense lines inside and outside, and the sealing performance is better.

The utility model is further configured as follows: the valve seat is provided with a tapered sealing surface, and a layer of metal wear-resistant layer is welded on the tapered sealing surface; The sealing surface of the sealing ring is sealed and connected with the metal wear-resistant layer. Through this setting, the structural setting is more reasonable, the sealing performance is better, and the service life of the valve is longer.

The utility model is further set as: the lower end of the valve stem sleeve is fixedly connected with the upper end of the valve body, the upper end of the valve stem is set through the valve stem sleeve, and a packing cavity is arranged between the upper end of the valve stem sleeve and the valve stem , the stuffing cavity is provided with stuffing, and the valve stem sleeve is detachably provided with a stuffing gland for closing the upper end opening of the stuffing cavity. Through this setting, the structural setting is more reasonable, and the sealing performance is good.

The utility model is further set as follows: the packing is an oxidation-resistant high-temperature solid force special packing, a packing chamber sealing ring groove is arranged at the bottom of the packing chamber, and a metal C-shaped sealing ring is arranged axially in the packing chamber sealing ring groove , a separation gasket is arranged between the metal C-shaped sealing ring and the packing. Through this setting, the metal C-shaped sealing ring is combined with oxidation-resistant high-temperature solid special packing, which can be used under high-temperature aerobic conditions, and eliminates the failure of flexible graphite packing due to oxidation.

The utility model is further set as follows: the lower end of the valve body is provided with a valve stem positioning hole, the lower end of the valve stem is located in the valve stem positioning hole, and the lower port of the valve stem positioning hole is arranged with a valve stem positioning groove, and the valve stem positioning groove A valve stem bearing is provided, and the valve stem bearing is integrated with the valve stem, and the bottom cover is fixedly connected with the lower port of the valve stem positioning hole of the valve body. Through this setting, the structure of the valve body is more reasonable, the positioning of the valve stem is reliable, and the operation is stable.

The utility model is further configured as follows: the lower end of the valve stem is covered with a stainless steel sleeve, and the lower end of the stainless steel sleeve is connected with the upper end surface of the valve stem bearing. Through this arrangement, the flexibility of rotation at the bottom of the valve stem is improved.

The utility model is further set as follows: the center of the valve stem is set eccentrically with the center of the flow channel of the valve body; the center of the valve stem is set eccentrically with the sealing center of the metal sealing ring. With this arrangement, the structure is simple and easy to process.

The utility model is further configured as follows: the packing gland is provided with several connecting bolts, and the packing gland is connected and fixed with the upper end surface of the valve stem sleeve through the connecting bolts. With this setting, the packing gland is conveniently connected and fixed reliably.

The advantages of the utility model are: compared with the prior art, the structure of the utility model is more reasonable; After the positioning springs and C-shaped sealing rings are installed on both sides, there is a radial gap between the metal sealing plate and the butterfly plate. Under high temperature conditions or temperature alternating conditions, it can shrink radially under the action of the positioning springs to ensure The valve will not swell and cannot be opened due to the expansion between parts, and at the same time, it can ensure that the valve is well sealed, not easy to leak, and has a long service life; the structure design is reasonable, simple in structure, convenient to use, and good in practicability.

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments of the description.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the enlarged schematic diagram of part I in Fig. 1;

Fig. 3 is a top view schematic diagram of the utility model embodiment;

FIG. 4 is an enlarged schematic view of part II in FIG. 1 .

detailed description

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a high temperature butterfly valve disclosed by the utility model includes a valve body 1, a butterfly plate 2, a valve stem 3, a valve stem sleeve 4 and a bottom cover 5, the valve body 1 is fixedly provided with a valve seat 6, and a valve stem connecting hole 21 is arranged axially inside the butterfly plate 2, and a keyway 211 is axially arranged on the inner wall surface of the valve stem connecting hole 21, and a keyway 211 is axially arranged on the inner wall of the valve stem 3. A flat key 7 matching the keyway 211 is fixed axially, the lower end of the valve stem 3 passes through the stem connecting hole 21, the flat key 7 is connected with the keyway 211; the butterfly plate 2 is aligned with the valve seat 6 position is provided with a sealing ring installation gap 22, a metal sealing ring 8 is arranged in the sealing ring installation gap 22, a spring gland 9 is arranged outside the sealing ring installation gap 22, and the inner wall surface of the spring gland 9 A spring positioning groove 91 is arranged on the top, and a positioning spring 10 is arranged in the spring positioning groove 91. One end of the positioning spring 10 is connected with the spring cover 9, and the other end of the positioning spring 10 is connected with the metal sealing ring 8, and the metal sealing ring 8 A sealing ring installation groove 81 is provided at the other end of the positioning spring 10, and a C-shaped sealing ring 11 is arranged in the sealing ring installation groove 81, and the inside of the C-shaped sealing ring 11 and the sealing ring installation gap 22 Wall connection.

Preferably, the flat key 7 and the valve stem 3 are integrally arranged or the flat key 7 and the valve stem 3 are fixed by welding; the positioning spring 10 is a nickel alloy spring, and the metal sealing ring 8 is made of an existing metal wear-resistant material. The valve seat 6 is integrated with the valve body 1 or fixed by welding; the spring cover 9 is limited to the positioning spring 10, and under the action of the positioning spring 10, the metal sealing ring 8 approaches the inner wall surface of the sealing ring installation gap 22 , so that the C-shaped sealing ring 11 is pressed against the inner wall surface of the sealing ring installation notch 22 .

In order to make the structure of the utility model more reasonable, preferably, the spring gland 9 in this embodiment is provided with connecting screws 12 , and the spring gland 9 is connected and fixed to the butterfly plate 2 through the connecting screws 12 .

The C-shaped sealing ring 11 is a metal sealing ring, and the opening of the C-shaped sealing ring 11 is arranged axially.

The valve seat 6 is provided with a conical sealing surface 61, and a metal wear-resistant layer 13 is welded on the conical sealing surface 61; the metal sealing ring 8 is aligned with the metal wear-resistant layer 13 and provided with a sealing ring seal The sealing surface 82 of the sealing ring is in sealing connection with the metal wear-resistant layer 13 .

The lower end of the valve stem sleeve 4 is fixedly connected to the upper end of the valve body 1, the upper end of the valve stem 3 is set through the valve stem sleeve 4, and a packing cavity 41 is arranged between the upper end of the valve stem sleeve 4 and the valve stem 3, The stuffing chamber 41 is provided with a stuffing 14 , and the valve stem sleeve 4 is detachably provided with a stuffing gland 15 for closing the upper end opening of the stuffing chamber 41 . Preferably, the packing 14 is an oxidation-resistant high-temperature solid special packing, and a packing chamber sealing ring groove 411 is arranged at the bottom of the packing chamber 41, and a metal C-shaped sealing ring is arranged axially in the packing chamber sealing ring groove 411 17. A separation gasket 18 is provided between the metal C-shaped sealing ring 17 and the packing 14.

The lower end of the valve body 1 is provided with a valve stem positioning hole 19, the lower end of the valve stem 3 is located in the valve stem positioning hole 19, and the lower port of the valve stem positioning hole 19 is provided with a valve stem positioning groove 20, and the valve stem positioning groove 20 is set There is a valve stem bearing 23, and the valve stem bearing 23 is integrated with the valve stem 3, and the bottom cover 5 is fixedly connected with the lower port of the valve stem positioning hole 19 of the valve body 1. One-piece stem bearing, surfacing or spray welding hard alloy directly on the stem.

Described valve rod 3 lower ends are provided with stainless steel cover 24, and the lower end of described stainless steel cover 24 is connected with the upper end surface of valve rod bearing 23.

The center of the valve stem 3 is set eccentrically to the center of the flow channel of the valve body 1 ; the center of the valve stem 3 is set eccentrically to the sealing center of the metal sealing ring 8 . The double eccentric right conical structure is easier to process than the triple eccentric structure.

Described packing gland 15 is provided with several connecting bolts 25, and packing gland 15 is connected and fixed with the upper end surface of valve stem sleeve 4 by connecting bolts 25.

The valve body 1 is forged and welded, has no leakage points, and meets the reliability requirements of high-temperature working conditions.

In actual application, the valve stem and the butterfly plate are connected by a flat key, which is easy to assemble and disassemble, and the opening and closing torque transmitted by the flat key is safe. There is a radial gap between them. Under high temperature or temperature alternating conditions, they can shrink radially under the action of the positioning spring to ensure that the valve will not be swollen and unable to open due to expansion between parts. At the same time, it can also ensure that the valve is well sealed, not easy to leak, and has a long service life; the structure design is reasonable, the structure is simple, the use is convenient, and the practicability is good.

The specific description of the utility model in the foregoing embodiments is only used to further illustrate the utility model, and cannot be interpreted as limiting the protection scope of the utility model. Technical engineers in the field make some non-essential modifications to the utility model according to the content of the utility model Improvements and adjustments all fall within the protection scope of the present utility model.

Claims (10)

1. A high-temperature butterfly valve, comprising a valve body (1), a butterfly plate (2), a valve stem (3), a valve stem cover (4) and a bottom cover (5), fixedly arranged in the valve body (1) There is a valve seat (6), which is characterized in that: a valve stem connection hole (21) is axially arranged in the butterfly plate (2), and a keyway is axially arranged on the inner wall surface of the valve stem connection hole (21) (211), the valve rod (3) is axially fixed with a flat key (7) matching the keyway (211), and the lower end of the valve rod (3) passes through the valve rod connection hole (21) , the flat key (7) is connected with the keyway (211); the butterfly plate (2) is aligned with the valve seat (6) and is provided with a sealing ring installation gap (22), and the sealing ring installation gap (22) A metal sealing ring (8) is provided, and a spring gland (9) is arranged outside the installation gap (22) of the sealing ring, and a spring positioning groove (91) is arranged on the inner wall of the spring gland (9). , the spring positioning groove (91) is provided with a positioning spring (10), one end of the positioning spring (10) is connected to the spring gland (9), and the other end of the positioning spring (10) is connected to the metal sealing ring (8) , the metal sealing ring (8) is provided with a sealing ring installation groove (81) relative to the other end of the positioning spring (10), and a C-shaped sealing ring (11) is arranged in the sealing ring installation groove (81), so The C-shaped sealing ring (11) is connected with the inner wall surface of the sealing ring installation notch (22). 2. A high-temperature butterfly valve according to claim 1, characterized in that: the spring gland (9) is provided with a connecting screw (12), and the spring gland (9) is connected by the connecting screw (12) Connect and fix with butterfly plate (2). 3. A high-temperature butterfly valve according to claim 2, characterized in that: the C-shaped sealing ring (11) is a metal sealing ring, and the opening of the C-shaped sealing ring (11) is arranged axially. 4. A high-temperature butterfly valve according to claim 3, characterized in that: the valve seat (6) is provided with a conical sealing surface (61), and a layer of Metal wear-resistant layer (13); the metal sealing ring (8) is aligned with the metal wear-resistant layer (13) to be provided with a sealing ring sealing surface (82), and the sealing ring sealing surface (82) and the metal wear-resistant layer (13) Sealed connection. 5. A high-temperature butterfly valve according to claim 4, characterized in that: the lower end of the valve stem sleeve (4) is fixedly connected to the upper end of the valve body (1), and the upper end of the valve stem (3) passes through The valve stem sleeve (4) is provided, and a stuffing chamber (41) is arranged between the upper end of the valve stem sleeve (4) and the valve stem (3). The stuffing chamber (41) is provided with a filler (14), and the valve stem The sleeve (4) is detachably provided with a packing gland (15) for closing the upper end opening of the packing chamber (41). 6. A high-temperature butterfly valve according to claim 5, characterized in that: the packing (14) is an oxidation-resistant high-temperature solid special packing, and the bottom of the packing chamber (41) is provided with a packing chamber sealing ring groove (411), a metal C-shaped sealing ring (17) is arranged axially in the stuffing cavity sealing ring groove (411), and a separation gasket (17) is arranged between the metal C-shaped sealing ring (17) and the filler (14). 18). 7. A high-temperature butterfly valve according to claim 1, characterized in that: the lower end of the valve body (1) is provided with a valve stem positioning hole (19), and the lower end of the valve stem (3) is located in the valve stem positioning hole (19). ), and the lower port of the valve stem positioning hole (19) is set with the valve stem positioning groove (20), the valve stem positioning groove (20) is provided with a valve stem bearing (23), and the valve stem bearing (23) is connected The rod (3) is integrally arranged, and the bottom cover (5) is fixedly connected with the lower port of the valve rod positioning hole (19) of the valve body (1). 8. A high-temperature butterfly valve according to claim 7, characterized in that: the lower end of the valve stem (3) is covered with a stainless steel sleeve (24), and the lower end of the stainless steel sleeve (24) is in contact with the valve stem bearing ( 23) The upper end face connection. 9. A high-temperature butterfly valve according to claim 1, characterized in that: the center of the valve stem (3) is set eccentrically with the center of the flow path of the valve body (1); the center of the valve stem (3) The sealing center of the center and the metal sealing ring (8) is set eccentrically. 10. A high-temperature butterfly valve according to claim 5, characterized in that: the packing gland (15) is provided with several connecting bolts (25), and the packing gland (15) is connected through the connecting bolts (25) It is connected and fixed with the upper end surface of the valve stem sleeve (4).