Butterfly valve with stably connected butterfly plate and valve rod

Abstract

A butterfly valve with a butterfly plate and a valve rod connected stably comprises a valve body, the butterfly plate and the valve rod, pin holes are formed in the butterfly plate and the valve rod, a combined pin is installed in the pin holes and comprises a fastening sleeve, a taper pin, a full-thread stud and a nut, the outer surface of the fastening sleeve is a cylindrical surface, a taper hole penetrating through the fastening sleeve in the axial direction is formed in the cylindrical surface, and the full-thread stud is installed in the taper pin. An opening penetrating through the fastening sleeve in the axial direction is formed in the side wall of the fastening sleeve, the taper pin is in a circular truncated cone shape, the taper pin is connected into the fastening sleeve in a sliding mode, the taper pin and the fastening sleeve are matched through a conical surface, a threaded hole is formed in the small-diameter end of the taper pin, one end of the full-thread stud is connected into the threaded hole, and the other end of the full-thread stud is connected with the other end of the full-thread stud. And the nut is connected to the full-thread stud. The taper pin is driven by screwing the nut to move towards the end with the small diameter, the fastening sleeve is expanded outwards along the opening, the outer cylindrical face of the fastening sleeve is in complete contact with connecting pin holes in the valve rod and the butterfly plate, gapless fit is achieved, and the butterfly plate and the valve rod can be connected more reliably through the structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of butterfly valves, and in particular relates to a butterfly valve with a butterfly plate and a valve stem firmly connected. Background Art

[0002] The butterfly valve is a regulating valve with a very simple structure. It is widely used in pipelines such as petroleum, chemical, gas, and water treatment. The butterfly valve realizes the opening and closing function of the valve by driving the butterfly plate to rotate through the valve stem. It is used to quickly cut off, connect, and adjust the medium in the pipeline.

[0003] like Figure 5 As shown, the butterfly plate 2 and the valve stem 4 of the existing butterfly valve are usually connected by a cylindrical pin 10 and a pin hole. It is difficult to achieve a gapless fit between the cylindrical pin and the pin hole. When the valve is opened and closed many times, the cylindrical pin is easily loosened or even damaged, causing rotation deviation between the butterfly plate 2 and the valve stem 4, affecting the valve sealing performance and reducing the service life of the valve. In addition, the cylindrical pin is difficult to install and disassemble, increasing the production cost of the valve. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model aims to provide a butterfly valve with a butterfly plate and a valve stem firmly connected.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A butterfly valve with a butterfly plate and a valve stem firmly connected, comprising a valve body, a butterfly plate and a valve stem, the valve body being provided with an axial hole penetrating from top to bottom, the valve stem being installed in the axial hole, the butterfly plate and the valve stem being provided with pin holes, a combination pin being installed in the pin hole, the combination pin comprising a fastening sleeve, a tapered pin, a full-thread stud and a nut, the outer surface of the fastening sleeve being a cylindrical surface and being provided with a tapered hole penetrating the fastening sleeve axially therein, the side wall of the fastening sleeve being provided with an opening penetrating the fastening sleeve axially, the tapered pin being truncated cone-shaped, the tapered pin being slidably connected in the fastening sleeve and the two being matched by a tapered surface, a threaded hole being provided at the end with a smaller diameter of the tapered pin, one end of the full-thread stud being threadedly connected in the threaded hole, the nut being threadedly connected to the full-thread stud, and one side of the nut abutting against the end of the fastening sleeve.

[0007] Preferably, a spring washer is sleeved on the fully threaded stud, and the spring washer is crimped between the end of the fastening sleeve and the nut.

[0008] Preferably, the upper and lower ends of the connection part between the butterfly plate and the valve stem are respectively provided with two pin holes, and a combination pin is installed in each pin hole.

[0009] Beneficial effects of the utility model

[0010] Compared with the prior art, the advantages of the present invention are:

[0011] The utility model drives the cone pin to move toward the end with a smaller diameter by tightening the nut, and stretches the fastening sleeve outward along the opening, so that the outer cylindrical surface of the fastening sleeve is in full contact with the connecting pin hole on the valve stem and the butterfly plate, and a gapless fit is achieved. This structure can make the connection between the butterfly plate and the valve stem more reliable, improve the sealing performance and service life of the valve; and this structure can reduce the diameter of the fastening sleeve by rotating the nut and moving the cone pin in the opposite direction, so that it can be disassembled smoothly, improve the efficiency of installation and disassembly, and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 for Figure 1 A partial enlarged view of the AA in the middle;

[0014] Figure 3 It is a perspective view of the fastening sleeve of the utility model;

[0015] Figure 4 It is a structural schematic diagram of the fastening sleeve of the utility model;

[0016] Figure 5 It is a structural schematic diagram of the existing butterfly plate and valve stem connection structure. DETAILED DESCRIPTION

[0017] 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 in 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.

[0018] In the description of the present invention, it should be noted that the terms "upper / lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] See also Figure 1-4 The utility model provides a technical solution: a butterfly valve with a butterfly plate and a valve stem firmly connected, comprising a valve body 1, a butterfly plate 2 and a valve stem 4, wherein the valve body 1 is provided with an axial hole penetrating from top to bottom, the valve stem 4 is installed in the axial hole, the butterfly plate 2 and the valve stem 4 are provided with pin holes, a combination pin 3 is installed in the pin hole, the combination pin 3 comprises a fastening sleeve 5, a tapered pin 6, a full-thread stud 7 and a nut 9, such as Figure 3 , 4 As shown, the outer surface of the fastening sleeve 5 is a cylindrical surface and a tapered hole is provided therein which penetrates the fastening sleeve 5 axially. The side wall of the fastening sleeve 5 is provided with an opening 20 which penetrates the fastening sleeve 5 axially. The tapered pin 6 is truncated cone-shaped. The tapered pin 6 is slidably connected in the fastening sleeve 5 and the two are matched through a tapered surface. A threaded hole is provided at the end with a small diameter of the tapered pin 6. One end of the full-thread stud 7 is threadedly connected in the threaded hole. The nut 9 is threadedly connected to the full-thread stud 7, and one side of the nut 9 abuts against the end of the fastening sleeve 5.

[0021] The utility model drives the cone pin 6 to move toward the end with a smaller diameter by tightening the nut 9, and stretches the fastening sleeve 5 outward along the opening 20, so that the outer cylindrical surface of the fastening sleeve 5 is in full contact with the connecting pin holes on the valve stem 4 and the butterfly plate 2, and a gapless fit is achieved. This structure can make the connection between the butterfly plate 2 and the valve stem 4 more reliable, improve the sealing performance and service life of the valve; and this structure can reduce the diameter of the fastening sleeve 5 by rotating the nut 9 and moving the cone pin 6 in the opposite direction, so that it can be smoothly disassembled, thereby improving the efficiency of installation and disassembly and reducing the production cost.

[0022] Furthermore, a spring washer 8 is sleeved on the full-thread stud 7 , and the spring washer 8 is crimped between the end of the fastening sleeve 5 and the nut 9 , so as to prevent the nut 9 and the full-thread stud 7 from loosening.

[0023] Further, if Figure 1 As shown, the upper and lower ends of the connection between the butterfly plate 2 and the valve stem 4 are each provided with two pin holes, and a combination pin 3 is installed in each pin hole to ensure that the upper and lower ends of the connection between the butterfly plate 2 and the valve stem 4 have equal strength and the torque is evenly transmitted.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve with a butterfly plate and a valve stem firmly connected, comprising a valve body (1), a butterfly plate (2) and a valve stem (4), wherein the valve body (1) is provided with an axial hole extending vertically therethrough, the valve stem (4) is installed in the axial hole, and pin holes are provided on the butterfly plate (2) and the valve stem (4), characterized in that: A combination pin (3) is installed in the pin hole. The combination pin (3) comprises a fastening sleeve (5), a tapered pin (6), a fully threaded stud (7) and a nut (9). The outer surface of the fastening sleeve (5) is a cylindrical surface and is provided with a tapered hole axially penetrating the fastening sleeve (5). The side wall of the fastening sleeve (5) is provided with an opening (20) axially penetrating the fastening sleeve (5). The tapered pin (6) is truncated cone-shaped. The tapered pin (6) is slidably connected in the fastening sleeve (5) and the two are matched through a tapered surface. A threaded hole is provided at the end of the tapered pin (6) with a smaller diameter. One end of the fully threaded stud (7) is threadedly connected in the threaded hole. The nut (9) is threadedly connected to the fully threaded stud (7). One side of the nut (9) abuts against the end of the fastening sleeve (5).

2. A butterfly valve with a stable connection between the butterfly plate and the valve stem according to claim 1, characterized in that: A spring washer (8) is sleeved on the fully threaded stud (7), and the spring washer (8) is crimped between the end of the fastening sleeve (5) and the nut (9).

3. A butterfly valve with a stable connection between the butterfly plate and the valve stem according to claim 1, characterized in that: Two pin holes are respectively provided at the upper and lower ends of the connection portion between the butterfly plate (2) and the valve stem (4), and a combination pin (3) is installed in each pin hole.

Images