Anti-loosening structure and butterfly valve

Abstract

The utility model discloses an anti-loosing structure and a butterfly valve, the anti-loosing structure comprises a valve body, an inner cavity is arranged in the valve body, a channel is arranged on the side wall of the valve body, and the channel is communicated with the inner cavity and is used for a medium to flow through; a valve seat is arranged in the channel, and the end face, facing the inner cavity, of the valve seat abuts against the inner wall of the channel. A valve seat pressing ring is arranged on the side, away from the inner cavity, of the valve seat in the channel, a plurality of threaded through holes are formed in the side wall of the valve seat pressing ring in the circumferential direction at intervals, and the threaded through holes penetrate through the valve seat pressing ring in the length direction of the channel. First screws are in threaded connection in the threaded through holes, and the tips of the first screws abut against the end face, away from the inner cavity, of the valve seat. The threaded through hole is further internally in threaded connection with an anti-disengaging screw, and the tip end of the anti-disengaging screw abuts against the end face, away from the valve seat, of the first screw. According to the butterfly valve, the two locking anti-loosening lines are used for effectively limiting rotation loosening of the first screw caused by vibration and other external reasons, and the stability of the sealing performance of the butterfly valve in the working process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve manufacturing, in particular to an anti-loosening structure and a butterfly valve. Background Art

[0002] The valve seat and valve body of the three-eccentric side-mounted butterfly valve adopt a split structure. The valve seat is fastened in the internal channel of the valve body by a valve seat pressure ring and a hexagon socket screw to improve the sealing performance of the butterfly valve. However, most existing anti-loosening structures have poor anti-loosening effects. Due to various reasons such as temperature changes, pressure fluctuations and medium erosion, the hexagon socket screws are prone to loosening or even falling off, resulting in reduced sealing performance of the butterfly valve, which ultimately affects the normal use of the butterfly valve. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defects that the anti-loosening effect of the anti-loosening structure applied to butterfly valves in the prior art is poor, the hexagon socket screws are easy to loosen or even fall off, resulting in unstable sealing performance of the butterfly valve, thereby providing an anti-loosening structure and a butterfly valve.

[0004] According to a first aspect of the utility model, an anti-loosening structure is provided, comprising:

[0005] A valve body is provided with an inner cavity therein, and a channel is provided on a side wall of the valve body, the channel is communicated with the inner cavity and is used for the medium to flow through;

[0006] A valve seat is arranged in the channel, and an end surface of the valve seat facing the inner cavity abuts against an inner wall of the channel;

[0007] A valve seat pressure ring is arranged in the passage and located on a side of the valve seat away from the inner cavity, and a plurality of threaded through holes are arranged at intervals along the circumferential direction on the side wall of the valve seat pressure ring;

[0008] A first screw, threadedly connected in the threaded through hole, with a tip abutting against an end surface of the valve seat facing away from the inner cavity;

[0009] An anti-slip screw is threadedly connected in the threaded through hole, and a tip thereof abuts against an end surface of the first screw facing away from the valve seat.

[0010] According to an anti-loosening structure of the utility model, at least the following technical effects are achieved:

[0011] By arranging a plurality of threaded through holes at intervals along the circumference on the valve seat pressure ring, when the valve seat needs to be fastened and locked in the passage of the valve body, firstly, the first screw is threadedly connected in the threaded through hole, so that the tip of the first screw is pressed against the end face of the valve seat facing the valve seat pressure ring, and the first locking anti-loosening line is formed by the thread pre-tightening force between the first screw and the threaded through hole; then, the anti-loosening screw is threadedly connected in the threaded through hole, so that the tip of the anti-loosening screw is pressed against the end face of the first screw away from the valve seat, and the friction between the tip of the anti-loosening screw and the end face of the first screw away from the valve seat is formed to form a second locking anti-loosening line, so that the two locking anti-loosening lines effectively limit the rotation loosening of the first screw caused by external reasons such as vibration, effectively prevent the first screw from loosening or even falling off during the operation of the butterfly valve equipped with the anti-loosening structure, and improve the stability of the sealing performance of the butterfly valve equipped with the anti-loosening structure during the operation. In addition, the anti-loosening structure has a simple structure and is easy to produce and assemble.

[0012] Preferably, the valve seat pressure ring is movably embedded in the channel, and during assembly, one end of the valve seat pressure ring facing away from the valve seat is locked and limited by a locking assembly.

[0013] Preferably, a circle of mounting grooves is recessed on the surrounding wall of the channel corresponding to the position of the locking assembly, and the locking assembly includes four open rings, and the four open rings include four separate arc-shaped portions, and the four arc-shaped portions form a circular ring structure. The four open rings are detachably connected to the mounting grooves by second screws, and part of the four open rings extends outside the mounting groove and abuts against the end face of the valve seat pressure ring facing away from the valve seat.

[0014] Preferably, each of the arc-shaped portions is provided with a through hole, and the through hole penetrates the arc-shaped portion in the radial direction of the arc-shaped portion, and a second threaded hole is provided in the mounting groove at a position corresponding to the through hole, and during assembly, the second screw passes through the through hole and is threadedly connected in the second threaded hole.

[0015] Preferably, a limiting groove is concavely provided on the outer side wall of the valve seat pressure ring at one end facing away from the valve body; during assembly, the portion of the four-open ring extending to the installation groove is clamped in the limiting groove and abuts against the surrounding wall of the limiting groove.

[0016] Preferably, a first gasket is provided between an end surface of the valve seat facing the inner cavity and an inner wall of the channel.

[0017] Preferably, a circle of embedding grooves is provided on the end surface of the valve seat facing the first gasket, and the first gasket is partially embedded in the embedding grooves.

[0018] A butterfly valve provided according to a second aspect of the utility model includes the anti-loosening structure provided by the first aspect.

[0019] A butterfly valve according to the utility model has at least the following technical effects:

[0020] By arranging a plurality of threaded through holes at intervals along the circumferential direction on the valve seat pressure ring, when the valve seat needs to be fastened and locked in the channel of the valve body, the first screw is first threadedly connected in the threaded through hole, so that the tip of the first screw is tightly abutted against the end face of the valve seat facing the valve seat pressure ring, and the thread pre-tightening force between the first screw and the threaded through hole is used to form a first locking and anti-loosening line; then the anti-slip screw is threadedly connected in the threaded through hole, so that the tip of the anti-slip screw is tightly abutted against the end face of the first screw away from the valve seat, and the friction force between the tip of the anti-slip screw and the end face of the first screw away from the valve seat is used to form a second locking and anti-loosening line, so that the two locking and anti-loosening lines can effectively limit the rotational loosening of the first screw caused by external reasons such as vibration, effectively preventing the first screw from loosening or even falling off during the operation of the butterfly valve, and improving the stability of the sealing performance of the butterfly valve during operation.

[0021] Preferably, it also includes a butterfly plate, which is rotatably connected in the inner cavity, and the butterfly plate has a conducting state that connects the inner cavity with the channel, and a closed state that blocks the inner cavity from the channel; the butterfly plate is driven by the valve stem to rotate and switch between the conducting state and the closed state.

[0022] Preferably, a sealing ring is provided on the outer side wall of the butterfly plate, and when the butterfly plate is in a closed state, the sealing ring is filled between the outer side wall of the butterfly plate and the inner side wall of the valve seat.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 Schematic diagram of a structure of an anti-loosening structure of this embodiment;

[0026] Figure 2 It is a schematic diagram of the structure of the four open loops in this embodiment.

[0027] Description of reference numerals:

[0028] 1-valve body, 11-inner cavity, 12-channel;

[0029] 2-valve seat, 21-first gasket;

[0030] 3-valve seat pressure ring, 31-threaded through hole;

[0031] 41-first screw, 42-anti-slip screw;

[0032] 5-four open rings, 51-arc-shaped portion, 511-perforation;

[0033] 6- butterfly plate, 61- sealing ring. DETAILED DESCRIPTION

[0034] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Embodiment 1

[0039] like Figure 1The figure shows an anti-loosening structure provided by the present embodiment, comprising a valve body 1, wherein an inner cavity 11 is arranged in the valve body 1, and a channel 12 is arranged on the side wall of the valve body 1, wherein the channel 12 is connected with the inner cavity 11 and is used for medium to flow through; a valve seat 2 is arranged in the channel 12, and the end surface of the valve seat 2 facing the inner cavity 11 abuts against the inner wall of the channel 12; a valve seat pressure ring 3 is arranged in the channel 12 on the side of the valve seat 2 away from the inner cavity 11, and the side wall of the valve seat pressure ring 3 A plurality of threaded through holes 31 are arranged at intervals along the circumference of the upper edge, preferably four threaded through holes 31 are arranged here, and the threaded through holes 31 penetrate the valve seat pressure ring 3 along the length direction of the channel 12; a first screw 41 is threadedly connected in the threaded through hole 31, and the tip of the first screw 41 abuts against the end face of the valve seat 2 away from the inner cavity 11; an anti-slip screw 42 is also threadedly connected in the threaded through hole 31, and the tip of the anti-slip screw 42 abuts against the end face of the first screw 41 away from the valve seat 2. It can be understood that the length direction of the channel 12 described in this embodiment refers to Figure 1 The first direction in .

[0040] The anti-loosening structure of this embodiment is characterized by arranging four threaded through holes 31 at intervals along the circumferential direction on the valve seat pressure ring 3. When the valve seat 2 needs to be fastened and locked in the channel 12 of the valve body 1, the first screw 41 is firstly threadedly connected in the threaded through hole 31, so that the tip of the first screw 41 is tightly pressed against the end face of the valve seat 2 facing the valve seat pressure ring 3, and the first locking anti-loosening line is formed by the thread pre-tightening force between the first screw 41 and the threaded through hole 31; then, the anti-loosening screw 42 is threadedly connected in the threaded through hole 31, so that the tip of the anti-loosening screw 42 is pressed against the end face of the valve seat 2 facing the valve seat pressure ring 3. The first screw 41 is pressed against the end face of the first screw 41 away from the valve seat 2, and the friction between the tip of the anti-loosening screw 42 and the end face of the first screw 41 away from the valve seat 2 forms a second locking anti-loosening line, thereby effectively limiting the rotational loosening of the first screw 41 due to external reasons such as vibration by using two locking anti-loosening lines, effectively preventing the first screw 41 from loosening or even falling off during the operation of the butterfly valve equipped with the anti-loosening structure of this embodiment, and improving the stability of the sealing performance of the butterfly valve equipped with the anti-loosening structure of this embodiment during the operation. In addition, the anti-loosening structure of this embodiment is simple in structure and easy to produce and assemble.

[0041] In specific applications, the number of the threaded through holes 31 is reasonably increased or decreased according to the diameter of the cross section of the valve seat pressure ring 3 perpendicular to the first direction. For example, in other embodiments, the threaded through holes 31 are provided with two, three, five or other numbers.

[0042] In some embodiments of the utility model, the valve seat pressing ring 3 is movably embedded in the channel 12, and during assembly, the end of the valve seat pressing ring 3 away from the valve seat 2 is locked and limited by the locking assembly. In this way, when the valve seat 2 is damaged and needs to be repaired and replaced, the locking assembly can be unlocked to release the restriction on the freedom of the valve seat pressing ring 3 to move in the first direction away from the valve seat 2, thereby facilitating the removal of the valve seat pressing ring 3 from the channel 12, and further facilitating the disassembly of the valve seat 2 for repair and replacement, thereby reducing the difficulty of repair and replacement. It should be noted that during assembly, because the first screw 41 is threadedly connected in the threaded through hole 31 and the tip of the first screw 41 abuts against the end face of the valve seat 2, the first screw 41 limits the freedom of the valve seat pressing ring 3 to move in the first direction toward the direction close to the valve seat 2.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments of the utility model, a circle of mounting grooves is recessed on the surrounding wall of the channel 12 corresponding to the position of the locking assembly, and the locking assembly includes four open rings 5, and the four open rings 5 ​​include four separate arc-shaped portions 51, and the four arc-shaped portions 51 form a circular ring structure. The four open rings 5 ​​are detachably connected to the mounting grooves by second screws, and part of the four open rings 5 ​​extends outside the mounting grooves and abuts against the end face of the valve seat pressure ring 3 facing away from the valve seat 2. The four arc-shaped portions 51 are connected in the mounting groove in a circular ring structure by four second screws. At this time, the four arc-shaped portions 51 are respectively in contact with the four positions of the end face of the valve seat pressing ring 3 away from the valve seat 2, thereby realizing the locking and limiting of the valve seat pressing ring 3 along the first direction toward the end face away from the valve seat 2; when the valve seat 2 needs to be removed from the channel 12 for maintenance and replacement, the four second screws are removed, and the four arc-shaped portions 51 can be taken out from the mounting groove respectively, thereby facilitating the removal of the valve seat pressing ring 3 from the channel 12, and then facilitating the disassembly of the valve seat 2 for maintenance and replacement, thereby reducing the difficulty of maintenance and replacement.

[0044] In order to facilitate the assembly of the four arc-shaped portions 51 in the installation groove and to facilitate the removal of the four arc-shaped portions 51 from the installation groove, specifically, the outer diameter of the circular ring structure formed by the four arc-shaped portions 51 abutting against each other is smaller than the diameter of the installation groove.

[0045] As a further improvement of the above technical solution, each of the arc-shaped portions 51 is provided with a through hole 511, and the through hole 511 penetrates the arc-shaped portion 51 in the radial direction of the arc-shaped portion 51, and a second threaded hole is provided in the mounting groove at a position corresponding to the through hole 511; when the arc-shaped portion 51 is assembled and connected in the mounting groove, it is only necessary to pass the second screw through the through hole 511 and thread it in the corresponding second threaded hole; when the arc-shaped portion 51 needs to be removed from the mounting groove, it is only necessary to unscrew the second screw from the corresponding second threaded hole; the entire disassembly and assembly process is easy to operate. In order to prevent the nut of the second screw from being exposed, specifically, the through hole 511 is set as a countersunk hole.

[0046] In some embodiments of the utility model, a limiting groove is concavely provided on the outer side wall of the end of the valve seat pressure ring 3 away from the valve body 1; during assembly, the portion of the four-open ring 5 extending to the installation groove is clamped in the limiting groove and abuts against the surrounding wall of the limiting groove. The limiting groove provides a larger contact area for the four-open ring 5, further improving the locking and limiting effect of the four-open ring 5 on the end face of the valve seat pressure ring 3 away from the valve seat 2.

[0047] In order to further improve the sealing performance of the abutment between the end surface of the valve seat 2 facing the inner cavity 11 and the inner wall of the channel 12, as shown in FIG. Figure 1 As shown, in some embodiments of the present invention, a first gasket 21 is provided between the end surface of the valve seat 2 facing the inner cavity 11 and the inner wall of the channel 12 .

[0048] Specifically, a circle of embedding grooves is provided on the end surface of the valve seat 2 facing the first gasket 21, and the first gasket 21 is partially embedded in the embedding grooves. The position of the first gasket 21 is limited by the embedding grooves, so as to prevent the first gasket 21 from being displaced relatively large along the radial direction of the valve seat 2, thereby reducing the sealing performance of the abutment between the end surface of the valve seat 2 and the inner wall of the channel 12.

[0049] Embodiment 2

[0050] like Figure 1 and Figure 2 A butterfly valve provided in this embodiment is shown, including the anti-loosening structure described in the first embodiment.

[0051] The butterfly valve of this embodiment has four threaded through holes 31 arranged at intervals along the circumferential direction on the valve seat pressure ring 3. When the valve seat 2 needs to be fastened and locked in the channel 12 of the valve body 1, the first screw 41 is firstly threadedly connected in the threaded through hole 31, so that the tip of the first screw 41 is tightly pressed against the end face of the valve seat 2 facing the valve seat pressure ring 3, and the thread pre-tightening force between the first screw 41 and the threaded through hole 31 forms a first locking anti-loosening line; then the anti-loosening screw 42 is threadedly connected in the threaded through hole 31, so that the anti-loosening screw 42 is fastened in the threaded through hole 31. The tip of the screw 42 is pressed against the end face of the first screw 41 away from the valve seat 2, and the friction between the tip of the anti-loosening screw 42 and the end face of the first screw 41 away from the valve seat 2 forms a second locking and anti-loosening line. The two locking and anti-loosening lines can effectively limit the rotational loosening of the first screw 41 due to external reasons such as vibration, and effectively prevent the first screw 41 from loosening or even falling off during the operation of the butterfly valve of this embodiment, thereby improving the stability of the sealing performance of the butterfly valve of this embodiment during operation.

[0052] In some embodiments of the utility model, the butterfly valve further includes a butterfly plate 6, which is rotatably connected in the inner cavity 11, and has a conducting state in which the inner cavity 11 is connected to the channel 12, and a closing state in which the inner cavity 11 is blocked from the channel 12; the butterfly plate 6 is driven to rotate by a valve stem to switch between the conducting state and the closing state, and one end of the valve stem extends outside the valve body 1. The valve stem extending outside the valve body 1 drives the butterfly plate 6 to rotate in the inner cavity 11, so as to adjust the butterfly plate 6 to switch between the conducting state and the closing state.

[0053] In order to further improve the sealing effect of blocking the connection between the inner cavity 11 and the channel 12 when the butterfly plate 6 is in a closed state, specifically, a sealing ring 61 is provided on the outer wall of the butterfly plate 6. When the butterfly plate 6 is in a closed state, the sealing ring 61 is filled between the outer wall of the butterfly plate 6 and the inner wall of the valve seat 2.

[0054] In order to facilitate the accurate assembly of the sealing ring 61 on the outer wall of the butterfly plate 6 to achieve a better sealing effect, more specifically, a circle of positioning grooves is recessed on the outer wall of the butterfly plate 6 corresponding to the position of the sealing ring 61, and the sealing ring 61 is partially embedded in the positioning grooves.

[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An anti-loosening structure, characterized in that: include: A valve body (1) is provided with an inner cavity (11) therein, and a channel (12) is provided on a side wall of the valve body (1), wherein the channel (12) is communicated with the inner cavity (11) and is used for a medium to flow through; A valve seat (2) is arranged in the channel (12), and an end surface of the valve seat (2) facing the inner cavity (11) abuts against an inner wall of the channel (12); A valve seat pressure ring (3) is arranged in the passage (12) and is located on a side of the valve seat (2) facing away from the inner cavity (11), and a plurality of threaded through holes (31) are arranged at intervals along the circumferential direction on a side wall of the valve seat pressure ring (3); A first screw (41) is threadedly connected in the threaded through hole (31), and the tip thereof abuts against an end surface of the valve seat (2) facing away from the inner cavity (11); an anti-slip screw (42) threadedly connected in the threaded through hole (31), with the tip abutting against the end surface of the first screw (41) facing away from the valve seat (2); The valve seat pressure ring (3) is movably embedded in the channel (12), and during assembly, the end of the valve seat pressure ring (3) that is away from the valve seat (2) is locked and limited by a locking assembly; The surrounding wall of the channel (12) is provided with a circle of mounting grooves at a position corresponding to the position of the locking assembly. The locking assembly includes four open rings (5), and the four open rings (5) include four separate arc-shaped portions (51). The four arc-shaped portions (51) form a circular ring structure. The four open rings (5) are detachably connected to the mounting grooves by a second screw. Part of the four open rings (5) extends outside the mounting groove and abuts against the end surface of the valve seat pressure ring (3) facing away from the valve seat (2).

2. The anti-loosening structure according to claim 1, characterized in that: A through hole (511) is provided on each of the arc-shaped portions (51), and the through hole (511) penetrates the arc-shaped portion (51) in a radial direction of the arc-shaped portion (51). A second threaded hole is provided in the mounting groove at a position corresponding to the through hole (511). During assembly, the second screw passes through the through hole (511) and is threadedly connected in the second threaded hole.

3. The anti-loosening structure according to claim 1, characterized in that: A limiting groove is provided on the outer side wall of the end of the valve seat pressure ring (3) facing away from the valve body (1); during assembly, the portion of the four-open ring (5) extending to the installation groove is clamped in the limiting groove and abuts against the surrounding wall of the limiting groove.

4. An anti-loosening structure according to any one of claims 1 to 3, characterized in that: A first gasket (21) is provided between the end surface of the valve seat (2) facing the inner cavity (11) and the inner wall of the channel (12).

5. The anti-loosening structure according to claim 4, characterized in that: A circle of embedding grooves is arranged on the end surface of the valve seat (2) facing the first gasket (21), and the first gasket (21) is partially embedded in the embedding grooves.

6. A butterfly valve, characterized in that: The invention comprises the anti-loosening structure as described in any one of claims 1 to 5.

7. A butterfly valve according to claim 6, characterized in that: The valve also includes a butterfly plate (6), which is rotatably connected in the inner cavity (11), and has a conducting state in which the inner cavity (11) is connected to the channel (12), and a closing state in which the inner cavity (11) and the channel (12) are blocked; the butterfly plate (6) is driven by the valve stem to rotate and switch between the conducting state and the closing state.

8. A butterfly valve according to claim 7, characterized in that: A sealing ring (61) is provided on the outer side wall of the butterfly plate (6); when the butterfly plate (6) is in a closed state, the sealing ring (61) is filled between the outer side wall of the butterfly plate (6) and the inner side wall of the valve seat (2).

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