Hard sealing butterfly valve

Abstract

The invention discloses a hard sealing butterfly valve which comprises a valve body, a support assembly and a valve rod. The support assembly comprises a support, and a packing gland and a supporting piece are arranged in the support. The supporting piece comprises a supporting plate and a through hole formed in the supporting plate. A connecting hole is formed in the side face of the supporting plate, and the connecting hole is connected with an arranged fastener in a matched mode. The valve rod is further provided with a sliding groove, and one end of the fastener penetrates through the connecting hole and then is inserted into the sliding groove. In conclusion, the problem that the valve clack is damaged due to the fact that the valve rod slides downwards or upwards along the central axis of the valve rod is prevented through the fastener; particularly, the sliding groove is easy and convenient to machine, so that the valve rod is prevented from axially sliding, meanwhile, the machining difficulty of the valve rod can be reduced, and compared with the prior art that a nut is used for limiting and the valve rod is matched with a packing gland to prevent the valve rod from moving upwards, the mode has the advantages of being simple in structure, convenient to machine and high in limiting capacity.

Description

Technical Field

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

[0002] The structure of the butterfly valve in the prior art is roughly the same as the prior art with announcement number CN210068976 U, in which a bracket is installed on the valve body, and the actuator is fixed to the valve body by the bracket; however, in order to prevent the valve stem from axially sliding, that is, moving upward or downward along the central axis of the valve stem, which causes the valve disc to move upward or downward when rotating, resulting in the valve disc being poorly sealed and the valve disc wearing too quickly, it is also necessary to use a related limit piece to be sleeved on the valve stem to prevent the valve stem from sliding upward or downward when the actuator is working, which leads to an axially fixed structure of the valve stem and a large number of parts, as well as an increased difficulty in processing the valve stem. Summary of the invention

[0003] The object of the present invention is to provide a hard-sealed butterfly valve to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hard-sealed butterfly valve, comprising a valve body, a bracket assembly installed on the valve body, and a valve stem that penetrates the bracket assembly and is linked to the valve disc; the bracket assembly comprises a bracket, and a packing gland and a support member for supporting the valve stem are provided in the bracket; the support member comprises a support plate and a through hole opened on the support plate; a connecting hole is provided on the side of the support plate, and the connecting hole is adaptively connected to a fastener provided; a slide groove is also provided on the valve stem, and one end of the fastener is inserted into the slide groove after passing through the connecting hole.

[0005] As a preferred technical solution of the present invention: a mounting seat is further provided inside the bracket, and the support plate is fixed on the mounting seat.

[0006] As a preferred technical solution of the present invention: a support pad is further provided in the through hole, and the valve stem is connected to the support plate via the support pad.

[0007] As a preferred technical solution of the present invention: the number of the slide grooves is two, and the two slide grooves are symmetrically arranged in the radial direction of the valve stem.

[0008] As a preferred technical solution of the present invention: the fastener includes a rod body in contact with the slide groove, and the rod body is also provided with an external thread that matches the thread of the connecting hole.

[0009] As a preferred technical solution of the present invention: a through hole is further provided inside the rod body.

[0010] As a preferred technical solution of the present invention: the cross section of the support pad is in the shape of an I, and the material of the support pad is rubber.

[0011] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. After one end of the fastener is inserted into the slide groove, the fastener can be used to prevent the valve stem from moving upward or downward along its axis, so that the valve stem will not lift the valve disc upward or squeeze the valve disc downward when rotating while ensuring that the valve disc is open, thereby greatly simplifying the processing difficulty of the valve stem and reducing the number of parts for axial limiting the valve stem while protecting the valve disc; 2. Since the valve stem is connected to the bracket through a support member, the support member is used to support and limit the valve stem to reduce the vibration generated by the valve stem when it rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the exploded structure of the bracket assembly of the present invention; Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A; Figure 4 It is a schematic diagram of the exploded structure of the support member of the present invention; Figure 5 It is a partial enlarged schematic diagram of the valve stem of the present invention; Figure 6 It is a schematic diagram of the main structure of the fastener of the present invention.

[0013] In the figure: 1. valve body; 2. valve stem; 3. bracket assembly; 30. bracket; 31. packing gland; 32. support member; 33. mounting seat; 34. support pad; 35. support plate; 36. connecting hole; 37. fastener; 38. through hole; 39. rod body; 310. external thread; 311. through hole; 4. slide groove. DETAILED DESCRIPTION

[0014] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "upper surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0015] See also Figure 1-6 , an embodiment of the present invention: a hard-sealed butterfly valve, comprising a valve body 1, a bracket assembly 3 installed on the valve body 1, and a valve stem 2 that penetrates the bracket assembly 3 and is linked to the valve disc; the bracket assembly 3 comprises a bracket 30, in which a packing gland 31 and a support member 32 for supporting the valve stem 2 are provided; the support member 32 comprises a support plate 35 and a through hole 38 opened on the support plate 35; a connecting hole 36 is provided on the side of the support plate 35, and the connecting hole 36 is adaptively connected with a fastener 37 provided; a slide groove 4 is also provided on the valve stem 2, and one end of the fastener 37 is inserted into the slide groove 4 after passing through the connecting hole 36.

[0016] To sum up, since the slide groove 4 is processed on the valve stem 2 and one end of the fastener 37 is inserted into the slide groove 4, the fastener 37 can be used to prevent the valve stem 2 from sliding downward or upward along its axis, thereby preventing the valve disc from being damaged; in particular, the processing of the slide groove 4 is simple and convenient, so while preventing the valve stem 2 from axial sliding, it can also reduce the processing difficulty of the valve stem 2. Compared with the prior art, which uses a nut to limit and cooperates with a packing gland to prevent the valve stem 2 from moving upward, this method has the advantages of simple structure, convenient processing, and strong limiting ability.

[0017] In addition, the support member 32 can limit the valve stem 2 on the bracket 30, thereby reducing the length of the valve stem 2 exposed to the outside, and further ensuring the stability of the valve stem 2 when in use.

[0018] Furthermore, since a mounting seat 33 is also provided inside the bracket 30 and the support plate 35 is fixed on the mounting seat 33, the support plate 35 and the bracket 30 are movably connected, thereby facilitating the independent production and processing of the support plate 35, especially facilitating the maintenance and replacement of the support plate 35 in the later stage.

[0019] Furthermore, since a support pad 34 is also provided in the through hole 38, and the valve stem 2 is connected to the support plate 35 through the support pad 34, the support pad 34 can be sleeved outside the valve stem 2 to ensure the stability of the valve stem 2; wherein the cross section of the support pad 34 is an "I" shape, and the material of the support pad 34 is a rubber material, therefore, while facilitating the installation of the support pad 34, the wear caused by the support pad 34 on the valve stem 2 and the support plate 35 can also be reduced. In addition, the support pad 34 made of rubber material also has the advantage of absorbing and buffering vibrations.

[0020] On the basis of the above scheme, the number of the slide grooves 4 is two, and the two slide grooves 4 are symmetrically arranged in the radial direction of the valve stem 2. Therefore, when one end of the fastener 37 contacts with any end of the slide groove 4, the valve stem 2 can be prevented from continuing to rotate, so that the valve disc can be prevented from excessively rotating when opening or closing. Among them, the two slide grooves 4 are not connected, so when the fastener 37 contacts with any end of any slide groove 4, the valve stem 2 can be prevented from continuing to rotate.

[0021] Specifically, the fastener 37 includes a rod body 39 in contact with the slide groove 4, and the rod body 39 is also provided with an external thread 310 that is threadedly matched with the connecting hole 36. Therefore, the rod body 39 is in contact with the slide groove 4, so that the friction between the slide groove 4 and the rod body 39 can be reduced, so as to reduce the rotation resistance of the valve stem 2; wherein the slide groove 4 is symmetrically arranged in the radial direction of the valve stem 2, and in addition, when the external thread 310 is connected with the connecting hole 36, it is convenient to install and disassemble the fastener 37, and it can ensure that the fastener 37 can be stably and reliably connected to the support plate 35 after installation.

[0022] Furthermore, since a through hole 311 is provided inside the rod body 39, lubricating grease can be poured onto the valve stem 2 through the through hole 311, thereby further reducing the resistance of the valve stem 2 during rotation, and in particular, reducing the noise generated by friction during rotation of the valve stem 2.

[0023] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A hard seal butterfly valve, characterized in that: It comprises a valve body (1), a bracket assembly (3) mounted on the valve body (1), and a valve stem (2) which penetrates the bracket assembly (3) and is linked to the valve disc; The bracket assembly (3) comprises a bracket (30), wherein a packing gland (31) and a support member (32) for supporting the valve stem (2) are provided in the bracket (30); The support member (32) comprises a support plate (35) and a through hole (38) formed on the support plate (35); A connecting hole (36) is provided on the side of the support plate (35), and the connecting hole (36) is adapted to be connected to a fastener (37); The valve stem (2) is also provided with a slide groove (4), and one end of the fastener (37) passes through the connecting hole (36) and is inserted into the slide groove (4).

2. A hard seal butterfly valve according to claim 1, characterized in that: A mounting seat (33) is also provided inside the bracket (30), and the support plate (35) is fixed on the mounting seat (33).

3. A hard seal butterfly valve according to claim 2, characterized in that: A support pad (34) is also provided in the through hole (38), and the valve stem (2) is connected to the support plate (35) via the support pad (34).

4. A hard seal butterfly valve according to claim 1, 2 or 3, characterized in that: The number of the slide grooves (4) is two, and the two slide grooves (4) are symmetrically arranged in the radial direction of the valve stem (2).

5. A hard-sealed butterfly valve according to claim 4, characterized in that: The fastener (37) comprises a rod body (39) in contact with the slide groove (4), and the rod body (39) is also provided with an external thread (310) threadably matched with the connection hole (36).

6. A hard-seal butterfly valve according to claim 5, characterized in that: A through hole (311) is also provided inside the rod body (39).

7. A hard-sealed butterfly valve according to claim 6, characterized in that: The cross section of the support pad (34) is in the shape of an I, and the material of the support pad (34) is rubber.

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