High-temperature butterfly valve

Abstract

The utility model provides a high-temperature butterfly valve, which comprises a valve body, a valve seat, a valve core and a valve core, the valve plate is installed in the valve body, a sealing structure is arranged on the edge of the end face of the valve plate in the circumferential direction, and the sealing structure comprises a tip abutting against the valve seat; the valve rod penetrates through the valve body and the valve plate in the radial direction and is movably connected with the valve body. The sealing structure with the tip end is arranged on the valve plate to abut against the valve seat, surface contact sealing is changed into line contact sealing, when the valve is closed, the sealing structure can push away adhered particulate matter, sealing is achieved, and the problem that the medium leakage amount is increased due to the fact that the particulate matter adheres to the inner wall of the valve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a high-temperature butterfly valve. Background Art

[0002] High-temperature butterfly valves are widely used in high-temperature gas pipelines in metallurgy, building materials, chemicals, power stations, glass and other industries. As a high-temperature gas medium flow regulating or cutting device, high-temperature butterfly valves can be used in conjunction with various actuators to form equipment with different performances. In the prior art, high-temperature butterfly valves generally use surface contact between the valve plate and the valve seat to achieve sealing.

[0003] Chinese patent CN105090537A discloses a low-leakage high-temperature butterfly valve and its use in marine diesel engines, the high-temperature butterfly valve includes a valve body, a valve plate is arranged in the valve body, sealing baffles are arranged on both sides of the valve plate, a sealing member is arranged between the valve plate and at least one of the sealing baffles, and one end of the sealing member is fixed on the valve plate or the sealing baffle. The invention fixes the sealing member on the sealing baffle or the valve plate, and when the valve opening is 0, the sealing is completed by the elastic deformation of the sealing member, the sealing performance is good, and the direct contact between the sealing baffle and the valve plate is avoided, thereby improving the sealing performance, reducing the strict requirements on the flatness and surface roughness of the valve plate and the sealing baffle, and a small amount of particulate matter adhering to the valve plate and the sealing baffle will not cause a significant deterioration in the sealing effect, and has the advantages of good sealing effect and high reliability.

[0004] However, this technical solution has the following problems: first, the valve stem and valve seat are connected by a shaft sleeve, which is prone to thermal expansion in a long-term high-temperature environment, causing particles to enter the shaft sleeve and cause the shaft to stick; second, one end of the seal is embedded in the groove of the valve plate or baffle, and the other end is in surface contact with the valve plate or sealing baffle. During long-term use, particles such as catalysts will adhere to the inner wall of the valve, resulting in the seal and the valve plate or valve seat cannot be fully fitted, causing increased medium leakage. Utility Model Content

[0005] The purpose of the utility model is to provide a high-temperature butterfly valve in view of the deficiencies in the prior art. By arranging a sealing structure with a pointed end on the valve plate to abut against the valve seat, the surface contact seal is changed to a line contact seal. When the valve is closed, the sealing structure can push away the adhered particles to achieve sealing, thereby solving the problem of increased medium leakage caused by particles adhering to the inner wall of the valve.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A high temperature butterfly valve, comprising:

[0008] a valve body, on the inner side of which a valve seat is mounted;

[0009] A valve plate, installed in the valve body, with a sealing structure provided circumferentially on the edge of its end surface, wherein the sealing structure includes a tip abutting against the valve seat;

[0010] The valve stem radially passes through the valve body and the valve plate and is movably connected to the valve body.

[0011] As a preference, the valve seat is in the shape of a circular ring and is arranged in two sections on both sides of the valve stem.

[0012] As a preference, the sealing structure is arranged between the valve seat and the valve plate, and two sides constituting a tip on the cross section of the sealing structure are straight lines or curves, and the tip points to the valve seat.

[0013] As a preference, a heat insulation layer is circumferentially arranged on the inner wall of the valve body, and the heat insulation layer is axially arranged on both sides of the valve seat.

[0014] As a preference, a plurality of reinforcing ribs are arranged circumferentially of the valve seat, wherein the reinforcing ribs are connected to the valve body and are arranged to gradually contract radially inwardly along the valve seat.

[0015] As a preference, mounting seats are provided on both end surfaces of the valve plate, and the valve stem is installed in the mounting seats.

[0016] As a preference, the valve stem is sealedly connected to the valve body, and a packing and a bearing are provided at the connection, and the bearing is arranged outside the packing.

[0017] As a preferred embodiment, an adjusting bolt is installed at one end of the valve stem, and the other end is connected to a driving unit.

[0018] As a preferred embodiment, a limiting member is installed inside the driving unit.

[0019] As a preference, the thermal insulation layer is a casting layer.

[0020] The beneficial effects of the utility model are:

[0021] (1) The utility model provides a sealing structure on the valve plate to abut against the valve seat. When the valve is closed, the tip of the sealing structure will push away particles attached to the inner wall of the butterfly valve to both sides, so that a line seal is formed between the valve plate and the valve seat, thereby improving the reliability of the seal.

[0022] (2) The utility model provides a plurality of reinforcing ribs around the valve seat in combination with a cast insulation layer, thereby enhancing the structural strength of the valve seat and the insulation layer, thereby making the valve have better high temperature resistance.

[0023] (3) The utility model provides a high-temperature resistant bearing, which plays a role in positioning and guiding the valve stem and has a small deformation during use. Combined with the packing provided on the inner side thereof, it prevents particles from entering between the valve stem and the bearing and affecting the normal rotation of the valve stem, avoiding the problem of shaft sticking, and ensuring the stability and sealing of the valve stem during rotation.

[0024] In summary, the utility model has the advantages of strong sealing, high structural strength, stable operation under high temperature conditions, etc., and is particularly suitable for high-temperature flue gas ducts with more particulate matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a schematic diagram of a cross-sectional structure of a square in side view of the utility model;

[0027] Figure 3 For this utility model Figure 2 The local enlarged schematic diagram of point I in the middle;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model in the top view direction. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] Example

[0032] like Figure 1-4 As shown, this embodiment provides a high-temperature butterfly valve, including: a valve body 1, on the inner side of which a valve seat 11 is installed; a valve plate 2, which is installed in the valve body 1, and a sealing structure 21 is circumferentially arranged on the edge of its end face, and the sealing structure 21 includes a tip abutting against the valve seat 11; a valve stem 3, which radially passes through the valve body 1 and the valve plate 2, and is movably connected to the valve body 1. The valve seat 11 is annular, and is arranged on both sides of the valve stem 3 in two sections. The sealing structure 21 is arranged between the valve seat 11 and the valve plate 2, and the two sides of the tip on its cross section are straight lines or curves, and the tip points to the valve seat 11, and the sealing structure 21 is evenly distributed on the edge of the end face of the valve plate 2 with the center of the circle of the valve plate 2 as the rotation center. It should be noted that in this embodiment, the cross section of the sealing structure 21 is an isosceles triangle, and its base is located on the valve plate 2, but the shape of the sealing structure 21 can also be other forms, as long as it has a tip portion facing the valve seat 11.

[0033] By providing a sealing structure 21 on the valve plate 2 to abut against the valve seat 11, when the valve is closed, the tip of the sealing structure 21 will push away the particles attached to the inner wall of the butterfly valve to both sides, so that a line seal is formed between the valve plate 2 and the valve seat 11, thereby improving the reliability of the seal.

[0034] like Figure 2 As shown, the inner wall of the valve body 1 is provided with a heat insulation layer 12 in the circumferential direction, and the heat insulation layer 12 is axially arranged on both sides of the valve seat 11, and its boundary is Figure 2 The heat insulation layer 12 is a casting layer, and in this embodiment, the casting material is cement. The valve seat 11 is provided with a plurality of reinforcing ribs 13 in the circumferential direction, and the reinforcing ribs 13 are connected to the valve body 1 and are gradually contracted radially inwardly along the valve seat 11.

[0035] By arranging a plurality of reinforcing ribs 13 around the valve seat 11 and cooperating with the cast heat insulation layer 12, the structural strength of the valve seat 11 and the heat insulation layer 12 is enhanced, so that the valve has better high temperature resistance.

[0036] like Figure 1 , 2 As shown, mounting seats 22 are provided at both end surfaces of the valve plate 2 , and the valve stem is installed in the mounting seats 22 and is fixedly connected to the valve plate 2 in the circumferential direction.

[0037] like Figure 4 As shown, the valve stem 3 is sealed and connected to the valve body 1 , and a packing 31 and a bearing 32 are provided at the connection. The bearing 32 is arranged outside the packing 31 , and the bearing 32 is preferably a high temperature resistant bearing.

[0038] By providing a high-temperature resistant bearing 32, the valve stem 3 is positioned and guided while having a small deformation during use. The packing 31 provided on the inner side thereof can prevent particles from entering between the valve stem 3 and the bearing 32 and affecting the normal rotation of the valve stem, thereby avoiding the problem of shaft sticking and ensuring the stability and sealing of the valve stem during rotation.

[0039] like Figure 1 , 4 As shown, an adjusting bolt 4 is installed at one end of the valve stem 3, which can adjust the valve stem 2 axially to compensate for the thermal expansion of the valve stem, and the other end is connected to a driving unit 5 for driving the valve stem 2 to rotate. A limit member 6 is installed inside the driving unit 5 to prevent the valve stem 3 from excessive rotation during use.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature butterfly valve, characterized in that: include: a valve body, on the inner side of which a valve seat is mounted; A valve plate is installed in the valve body, and a sealing structure is provided circumferentially on the edge of the end surface of the valve plate, wherein the sealing structure includes a tip abutting against the valve seat; A valve stem radially passes through the valve body and the valve plate and is movably connected to the valve body; The valve seat is annular and is arranged in two sections on both sides of the valve stem; The sealing structure is arranged between the valve seat and the valve plate, and the two sides constituting the tip on the cross section of the sealing structure are straight lines or curves, and the tip points to the valve seat.

2. A high temperature butterfly valve according to claim 1, characterized in that: A heat insulation layer is circumferentially arranged on the inner wall of the valve body, and the heat insulation layer is axially arranged on both sides of the valve seat.

3. A high temperature butterfly valve according to claim 1, characterized in that: The valve seat is provided with a plurality of reinforcing ribs in the circumferential direction. The reinforcing ribs are connected to the valve body and are gradually contracted inwardly along the radial direction of the valve seat.

4. A high temperature butterfly valve according to claim 1, characterized in that: Mounting seats are arranged on both end surfaces of the valve plate, and the valve stem is mounted in the mounting seats.

5. A high temperature butterfly valve according to claim 1, characterized in that: The valve stem is sealed and connected to the valve body, and a filler and a bearing are arranged at the connection, and the bearing is arranged outside the filler.

6. A high temperature butterfly valve according to claim 1, characterized in that: An adjusting bolt is installed at one end of the valve stem, and a driving unit is connected to the other end.

7. A high temperature butterfly valve according to claim 6, characterized in that: A limiting member is installed inside the driving unit.

8. A high temperature butterfly valve according to claim 2, characterized in that: The heat insulation layer is a casting layer.

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