Limiting locking device and butterfly valve

Abstract

The utility model discloses a limiting locking device and a butterfly valve, the limiting locking device comprises a shell, a limiting assembly and a locking assembly, the shell is connected with a valve body and is provided with a limiting cavity, and the shell is provided with a plurality of penetrating parts communicated with the limiting cavity; the limiting assembly is rotationally arranged in the limiting cavity and comprises a limiting piece and a connecting piece which are connected with each other, the limiting piece is provided with a first limiting part and a second limiting part, and the limiting piece has an opening state in which the first limiting part corresponds to the first penetrating part and a closing state in which the second limiting part corresponds to the second penetrating part; a sleeving part and a first locking part are arranged on the connecting piece, and the connecting piece is arranged on a valve rod on the valve body in a sleeving mode through the sleeving part; the locking assembly comprises a plurality of locking pieces, in the opening state, part of the locking pieces are suitable for fixing the valve rod, the connecting piece and the limiting piece, and in the closing state, part of the locking pieces are suitable for fixing the limiting piece. The limiting and locking device with the structure is beneficial to improving the locking stability of the limiting and locking device.

Description

Technical Field

[0001] The utility model relates to the technical field of valve limit switches, in particular to a limit locking device and a butterfly valve. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. Valves 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.

[0003] In the prior art, the part of the valve that controls the on-off of the medium flow is the switch element. The switch element in some valves controls the on-off of the medium flow by its own rotation. For this type of valve, the rotation of the switch element can be controlled by using a limit locking device, so that the switch element is in an open state or a closed state, thereby controlling the on or off of the medium in the valve. When the medium flow is large, the switch element needs to be in a fully open state to increase the discharge volume of the valve. At this time, the switch element can also be locked at the rotation angle when it is fully opened through the limit locking device, so that the switch element is always in a fully open state, thereby increasing the discharge volume of the valve.

[0004] However, the existing limit locking device has low locking stability for the switch element, so that the switch element can easily escape from the lock and rotate under the impact of the medium, thereby leaving the fully open state. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the existing limit locking device has low locking stability for the switch part, making it easy for the switch part to escape from the lock and rotate under the impact of the medium, thereby leaving the fully open state.

[0006] To this end, the utility model provides a limit locking device, comprising:

[0007] A housing, wherein the housing is suitable for connecting with the valve body, the housing has a limiting cavity, and the housing is provided with a first through-portion, a second through-portion, and a third through-portion communicating with the limiting cavity;

[0008] A limit assembly is rotatably arranged in the limit cavity, the limit assembly comprises a limit member and a connecting member connected to each other, the limit member is provided with a first limit portion and a second limit portion, and the limit member has an open state and a closed state, in the open state, the first limit portion corresponds to the first penetration portion, in the closed state, the second limit portion corresponds to the second penetration portion, the connecting member is provided with a sleeve portion and a first locking portion connected to the sleeve portion, and the connecting member is suitable for being sleeved on the valve stem on the valve body through the sleeve portion;

[0009] The locking assembly includes a first locking member, a second locking member and a third locking member. In the open state, the first locking member is suitable for passing through the third through-part and the first locking member to abut against the valve stem to fix the valve stem and the connecting member, and the second locking member is suitable for passing through the first through-part to connect with the first limiting member to fix the limiting member. In the closed state, the third locking member is suitable for passing through the second through-part to connect with the second limiting member to fix the limiting member.

[0010] Optionally, in the above-mentioned limit locking device, a second locking portion is further provided on the connecting member; the locking assembly also includes a fourth locking member, and in the closed state, the fourth locking member is suitable for passing through the third through-portion and the second locking portion to abut against the valve stem to fix the connecting member and the valve stem.

[0011] Optionally, the above-mentioned limit locking device also includes a sealing assembly, which includes a first seal, a second seal and a third seal, the first seal is suitable for being inserted into the first through-hole to seal the first through-hole, the second seal is suitable for being inserted into the second through-hole to seal the second through-hole, and the third seal is suitable for being inserted into the third through-hole to seal the third through-hole.

[0012] Optionally, in the above-mentioned limiting locking device, the shell is further provided with a connecting portion communicating with the limiting cavity; and further comprises a covering member, wherein the covering member is suitable for being connected to the shell through the connecting portion to close the limiting cavity.

[0013] Optionally, in the above-mentioned limiting locking device, the sealing assembly further includes a fourth sealing member, and the fourth sealing member is arranged between the covering member and the shell to seal the gap between the covering member and the shell.

[0014] Optionally, in the above-mentioned limit locking device, when the shell is connected to the valve body, the end of the valve stem is arranged in the connecting part, so that under the action of external force, the end of the valve stem drives the valve stem to rotate.

[0015] Optionally, the above-mentioned limit locking device further includes a wrench, and the wrench is suitable for being connected to the end of the valve stem so that the wrench drives the valve stem to rotate under the action of an external force.

[0016] Optionally, in the above-mentioned limit locking device, a first identification portion and a second identification portion are further provided on the shell, and in the open state, the indicator portion on the valve stem points to the first identification portion, and in the closed state, the indicator portion on the valve stem points to the second identification portion.

[0017] Optionally, in the above-mentioned limit locking device, a third identification portion and a fourth identification portion are further provided on the shell, the third identification portion is arranged corresponding to the first penetration portion, and the fourth identification portion is arranged corresponding to the second penetration portion.

[0018] Optionally, in the above-mentioned limiting locking device, the shell includes a protective member and a mounting member, the mounting member is arranged between the valve body and the protective member to connect the protective member and the valve body, and the protective member and the mounting member together enclose the limiting cavity.

[0019] A butterfly valve comprises a valve body and the above-mentioned limit locking device.

[0020] The technical solution provided by the utility model has the following advantages:

[0021] 1. The limit locking device provided by the utility model comprises a shell, a limit assembly and a locking assembly. The shell is suitable for connecting with the valve body. The shell has a limit cavity. The shell is provided with a first through-hole, a second through-hole and a third through-hole which are communicated with the limit cavity. The limit assembly is rotatably arranged in the limit cavity. The limit assembly comprises a limit member and a connecting member which are connected to each other. The limit member is provided with a first limit portion and a second limit portion. The limit member has an open state and a closed state. In the open state, the first limit portion corresponds to the first through-hole. In the closed state, the second limit portion corresponds to the second through-hole. Corresponding to the through-part, a sleeve part and a first locking part connected to the sleeve part are provided on the connecting piece, and the connecting piece is suitable for being sleeved on the valve stem on the valve body through the sleeve part; the locking assembly includes a first locking piece, a second locking piece and a third locking piece. When in the open state, the first locking piece is suitable for passing through the third through-part and the first locking piece to abut against the valve stem to fix the valve stem and the connecting piece, and the second locking piece is suitable for passing through the first through-part and connecting with the first limiting part to fix the limiting piece. When in the closed state, the third locking piece is suitable for passing through the second through-part and connecting with the second limiting part to fix the limiting piece.

[0022] The limit locking device of this structure is provided with a limit assembly in the shell and a locking assembly between the shell and the limit assembly, wherein the shell has a limit cavity and a first through-hole, a second through-hole and a third through-hole communicated with the limit cavity, and the limit assembly is rotatably arranged in the limit cavity, and at the same time, the limit assembly includes a limit member and a connecting member connected to each other, wherein the limit member is provided with a first limit portion and a second limit portion, and the limit member has an opening state in which the first limit portion and the first through-hole are correspondingly arranged to The second limiting part and the second penetration part are in a closed state corresponding to each other, a sleeve part and a first locking part connected to the sleeve part are provided on the connecting piece, and when the shell is connected to the valve body, the connecting piece is sleeved on the valve stem on the valve body through the sleeve part, and the locking assembly includes a first locking piece, a second locking piece and a third locking piece, wherein, when the limiting part is in an open state, the first locking piece can pass through the third penetration part and the first locking piece to abut against the valve stem, thereby fixing the connecting piece and the valve stem to prevent the valve stem from idling in the sleeve part under the action of external force. At the same time, the second locking member can pass through the first penetration portion and be connected with the first limiting portion, so as to fix the limit member in the position when in the open state and make the medium in the valve body in the circulation state, and when the limit member is in the closed state, the third locking member can pass through the second penetration portion and be connected with the second limiting portion, so as to fix the limit member in the position when in the closed state and make the medium in the valve body in the isolation state. In addition, the switching of the limit member between the open state and the closed state is achieved by using an external force to rotate the valve stem to drive the connecting member to rotate, and the circulation of the medium in the valve body is controlled by rotating the limit member because the valve stem is connected to the switch member that controls the on and off of the pipeline in the valve body. In summary, by using the second locking member and the third locking member, the limit member is fixed when the limit member is in the open state or the closed state, so that the medium in the valve body is always in the circulation state or the isolation state. At the same time, it is also beneficial to improve the locking stability of the limit locking device, and avoid the switch member in the valve body from getting rid of the lock and rotating under the impact of the medium, thereby changing the state of the medium in the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a front cross-sectional view of a position limiting locking device provided in an embodiment of the utility model;

[0025] Figure 2A top cross-sectional view of a position limiting locking device provided in an embodiment of the utility model;

[0026] Figure 3 A schematic diagram of a partial identification portion of a limit locking device provided in an embodiment of the utility model;

[0027] Figure 4 A schematic diagram of another part of the identification portion of the limit locking device provided in an embodiment of the utility model;

[0028] Description of reference numerals:

[0029] 1-housing; 11-limiting cavity; 12-connecting part; 13-first identification part; 14-second identification part; 15-third identification part; 16-fourth identification part; 17-protective member; 18-installing member;

[0030] 2-limiting assembly; 21-limiting member; 211-first limiting portion; 212-second limiting portion; 22-connecting member; 221-sleeve portion; 222-first locking portion; 223-second locking portion;

[0031] 31-first locking member; 32-second locking member; 33-third locking member; 34-fourth locking member;

[0032] 41-first sealing member; 42-second sealing member; 43-third sealing member; 44-fourth sealing member;

[0033] 5-cover fitting; 6-wrench; 7-valve body; 71-indicator; 8-valve stem. 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 a limitation on 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.

[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] Example 1

[0039] This embodiment provides a limit locking device, such as Figures 1 to 4 As shown, it includes a shell 1, a limiting assembly 2 and a locking assembly. The shell 1 is suitable for connecting with the valve body 7. The shell 1 has a limiting cavity 11. The shell 1 is provided with a first through portion, a second through portion and a third through portion which are connected to the limiting cavity 11; the limiting assembly 2 is rotatably arranged in the limiting cavity 11. The limiting assembly 2 includes a limiting member 21 and a connecting member 22 which are connected to each other. The limiting member 21 is provided with a first limiting portion 211 and a second limiting portion 212. The limiting member 21 has an open state and a closed state. In the open state, the first limiting portion 211 corresponds to the first through portion. In the closed state, the second limiting portion 212 corresponds to the second through portion. The connecting member 22 is provided with a first limiting portion 211 and a second limiting portion 212. A sleeve portion 221 and a first locking portion 222 connected to the sleeve portion 221 are provided, and the connecting member 22 is suitable for being sleeved on the valve stem 8 on the valve body 7 through the sleeve portion 221; the locking assembly includes a first locking member 31, a second locking member 32 and a third locking member 33. When in the open state, the first locking member 31 is suitable for passing through the third penetration portion and the first locking portion 222 to abut against the valve stem 8 to fix the valve stem 8 and the connecting member 22, and the second locking member 32 is suitable for passing through the first penetration portion to connect with the first limiting portion 211 to fix the limiting member 21. When in the closed state, the third locking member 33 is suitable for passing through the second penetration portion to connect with the second limiting portion 212 to fix the limiting member 21.

[0040] The limit locking device of the above structure is provided with a limit assembly 2 in the housing 1 and a locking assembly between the housing 1 and the limit assembly 2, wherein the housing 1 has a limit cavity 11 and a first through portion, a second through portion and a third through portion communicated with the limit cavity 11, wherein the first through portion, the second through portion and the third through portion are respectively a first through hole, a second through hole and a third through hole in this embodiment, and the limit assembly 2 is rotatably provided in the limit cavity 11, and at the same time, the limit assembly 2 includes a limit member 21 and a connecting member 22 connected to each other, and the limit member 21 is In this embodiment, it is a limit block, and the connecting member 22 is a connecting block in this embodiment, wherein the limit member 21 is provided with a first limit portion 211 and a second limit portion 212, and the first limit portion 211 and the second limit portion 212 are respectively a first threaded hole and a second threaded hole in this embodiment, and the limit member 21 has an open state in which the first limit portion 211 is correspondingly arranged with the first through portion and a closed state in which the second limit portion 212 is correspondingly arranged with the second through portion, and the connecting member 22 is provided with a sleeve portion 221 and a first locking portion 222 connected with the sleeve portion 221, and the sleeve portion 22 In this embodiment, the first locking portion 222 is a first locking hole, and when the housing 1 is connected to the valve body 7, the connecting member 22 is sleeved on the valve stem 8 on the valve body 7 through the sleeve portion 221. The locking assembly includes a first locking member 31, a second locking member 32 and a third locking member 33. The first locking member 31, the second locking member 32 and the third locking member 33 are respectively the first bolt, the second bolt and the third bolt in this embodiment. When the limiting member 21 is in the open state, the first locking member 31 can pass through the third penetration portion and the first locking portion 222. It abuts against the valve stem 8, thereby fixing the connecting piece 22 and the valve stem 8 to prevent the valve stem 8 from idling in the sleeve portion 221 under the action of external force. At the same time, the second locking piece 32 can pass through the first through-hole and connect with the first limiting portion 211, thereby fixing the limiting piece 21 in the position when it is in the open state and allowing the medium in the valve body 7 to be in a flowing state. When the limiting piece 21 is in the closed state, the third locking piece 33 can pass through the second through-hole and connect with the second limiting portion 212, thereby fixing the limiting piece 21 in the position when it is in the closed state and allowing the medium in the valve body 7 to be in a blocked state.

[0041] In addition, the switching of the limit member 21 between the open state and the closed state is achieved by using an external force to rotate the valve stem 8 to drive the connecting member 22 to rotate, and the circulation of the medium in the valve body 7 is controlled by rotating the limit member 21 because the valve stem 8 is connected to the switch member in the valve body 7 that controls the on and off of the pipeline. In summary, by using the second locking member 32 and the third locking member 33, the limit member 21 is fixed when the limit member 21 is in the open state or the closed state, so that the medium in the valve body 7 is always in the circulation state or the isolation state. At the same time, it is also beneficial to improve the locking stability of the limit locking device, thereby preventing the switch member in the valve body 7 from getting rid of the lock and rotating under the impact of the medium, thereby changing the state of the medium in the valve body 7.

[0042] Specifically, when the limit member 21 needs to switch from the open state to the closed state, the second locking member 32 needs to be removed from the first limit portion 211 first, so that the limit member 21 can rotate under the drive of the valve stem 8, so that the limit member 21 can switch from the open state to the closed state. Similarly, when the limit member 21 needs to switch from the closed state to the open state, the third locking member 33 needs to be removed from the second limit portion 212 first.

[0043] The limit locking device provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, a second locking portion 223 is also provided on the connecting member 22; the locking assembly also includes a fourth locking member 34. When in the closed state, the fourth locking member 34 is suitable for passing through the third through-portion and the second locking portion 223 to abut against the valve stem 8 to fix the connecting member 22 and the valve stem 8.

[0044] The limit locking device of the above structure, through the second locking portion 223 opened on the connecting member 22 and the setting of the locking assembly also includes a fourth locking member 34. The second locking portion 223 is a second locking hole in the present embodiment, and the fourth locking member 34 is a fourth bolt in the present embodiment. Therefore, when the limit member 21 is in the closed state, the fourth locking member 34 can pass through the third through-portion and the second locking portion 223 to abut against the valve stem 8, thereby making the connection between the connecting member 22 and the valve stem 8 more stable, which is beneficial to improving the connection strength between the connecting member 22 and the valve stem 8.

[0045] The limit locking device provided in this embodiment is as follows: Figure 2 As shown, it also includes a sealing assembly, which includes a first seal 41, a second seal 42 and a third seal 43. The first seal 41 is suitable for being inserted into the first through-portion to seal the first through-portion, the second seal 42 is suitable for being inserted into the second through-portion to seal the second through-portion, and the third seal 43 is suitable for being inserted into the third through-portion to seal the third through-portion.

[0046] The limit locking device of the above structure is provided with a sealing component on the shell 1, and the sealing component specifically includes a first seal 41, a second seal 42 and a third seal 43. The first seal 41, the second seal 42 and the third seal 43 are respectively the first screw plug, the second screw plug and the third screw plug in the present embodiment, wherein the first seal 41 can be inserted into the first through-hole to block the first through-hole, the second seal 42 can be inserted into the second through-hole to block the second through-hole, and the third seal 43 can be inserted into the third through-hole to block the third through-hole, so as to prevent the medium from flowing into the limit cavity 11 through the first through-hole, the second through-hole and the third through-hole when the limit locking device is placed into the medium along with the valve body 7, and corroding the limit assembly 2, thereby reducing the locking stability of the limit locking device.

[0047] Specifically, when the second locking member 32 or the third locking member 33 needs to be removed, the first sealing member 41 or the second sealing member 42 needs to be removed from the shell 1 first, so that the second locking member 32 or the third locking member 33 is exposed to the outside, and then the staff can remove the second locking member 32 or the third locking member 33.

[0048] The limit locking device provided in this embodiment is as follows: Figure 1 As shown, the housing 1 is further provided with a connecting portion 12 communicating with the limiting cavity 11 ; and further comprises a covering member 5 , which is suitable for being connected to the housing 1 through the connecting portion 12 to close the limiting cavity 11 .

[0049] The limit locking device of the above structure is through a connecting portion 12 opened on the shell 1 and a covering member 5 connected to the shell 1. The connecting portion 12 is a connecting groove in the present embodiment, and the covering member 5 is a top cover in the present embodiment. Since the connecting portion 12 is connected to the limit cavity 11, when the limit locking device is placed into the medium along with the valve body 7, the medium can flow into the limit cavity 11 through the connecting portion 12. Therefore, the connecting portion 12 is covered by the covering member 5, thereby blocking the limit cavity 11 and preventing the medium from flowing into the limit cavity 11.

[0050] The limit locking device provided in this embodiment is as follows: Figure 1 As shown, the sealing assembly further includes a fourth sealing member 44 , which is disposed between the cover member 5 and the housing 1 to seal the gap between the cover member 5 and the housing 1 .

[0051] The limit locking device of the above structure also includes a fourth seal 44 by setting a sealing assembly. The fourth seal 44 is a rubber ring in this embodiment. The fourth seal 44 is specifically arranged between the cover 5 and the shell 1, so as to seal the gap between the cover 5 and the shell 1 to prevent the medium from flowing into the limit cavity 11 through the gap. Of course, the more seals are arranged between the cover 5 and the shell 1, the better the sealing performance between the cover 5 and the shell 1.

[0052] The limit locking device provided in this embodiment is as follows: Figure 1 As shown, when the housing 1 is connected to the valve body 7, the end of the valve stem 8 is arranged in the connecting portion 12, so that under the action of external force, the end of the valve stem 8 drives the valve stem 8 to rotate.

[0053] The limit locking device of the above structure is configured such that the end of the valve stem 8 is arranged in the connecting portion 12. When the shell 1 is connected to the valve body 7, the end of the valve stem 8 needs to be arranged in the connecting portion 12. Therefore, when the state of the medium in the valve body 7 is changed, the valve stem 8 can be driven to rotate by an external force, so that the valve stem 8 drives the switch member connected to the valve stem 8 to rotate, thereby changing the state of the medium in the valve body 7. At the same time, the valve stem 8 will also drive the connecting member 22 and the limit member 21 to rotate, thereby switching the limit member 21 between the open state and the closed state. When the limit member 21 is in the open state or the closed state, the limit member 21 is fixed by the locking assembly, thereby ensuring that the medium in the valve body 7 is always in one state.

[0054] The limit locking device provided in this embodiment is as follows: Figure 1 As shown, a wrench 6 is also included, and the wrench 6 is suitable for being connected to the end of the valve stem 8 so that the wrench 6 drives the valve stem 8 to rotate under the action of an external force.

[0055] The limit locking device of the above structure uses a wrench 6 that can be connected to the end of the valve stem 8. When the state of the medium in the valve body 7 needs to be changed, that is, when the valve stem 8 needs to be rotated, the wrench 6 can be connected to the end of the valve stem 8 first, and then an external force can be used to drive the valve stem 8 to rotate, thereby increasing the power arm and facilitating the operation of the staff.

[0056] Specifically, when the wrench 6 is needed to drive the valve stem 8 to rotate, the cover 5 needs to be removed from the shell 1 so that the end of the valve stem 8 can be exposed to the outside, and then the wrench 6 can be connected to the end of the valve stem 8 and drive the valve stem 8 to rotate under the action of external force.

[0057] The limit locking device provided in this embodiment is as follows: Figure 3 and Figure 4As shown, the housing 1 is further provided with a first identification portion 13 and a second identification portion 14 . In the open state, the indicator portion 71 on the valve stem 8 points to the first identification portion 13 . In the closed state, the indicator portion 71 on the valve stem 8 points to the second identification portion 14 .

[0058] The limit locking device of the above structure is provided with a first identification portion 13 and a second identification portion 14 on the shell body 1 and an indication portion 71 on the valve stem 8. In the present embodiment, the first identification portion 13 and the second identification portion 14 are respectively engraved with the words "open" and "closed" on the shell body 1, and the indication portion 71 is an indication groove provided on the end of the valve stem 8 in the present embodiment, wherein the first identification portion 13 corresponds to the open state of the limit member 21, and the second identification portion 14 corresponds to the closed state of the limit member 21. Therefore, when the staff rotates the valve stem 8, they can determine the state of the limit member 21 and the state of the medium in the valve body 7 by observing the position pointed to by the indication portion 71 on the valve stem 8, namely the first identification portion 13 and the second identification portion 14.

[0059] The limit locking device provided in this embodiment is as follows: Figure 3 and Figure 4 As shown, the housing 1 is further provided with a third identification portion 15 and a fourth identification portion 16 , the third identification portion 15 is provided corresponding to the first penetration portion, and the fourth identification portion 16 is provided corresponding to the second penetration portion.

[0060] The limit locking device of the above structure is provided with a third identification portion 15 and a fourth identification portion 16 on the shell 1. The third identification portion 15 and the fourth identification portion 16 in this embodiment are respectively engraved on the shell 1 as “open limit” and “closed limit”, wherein the third identification portion 15 is provided corresponding to the first through-portion and corresponds to the open state of the limit member 21, and the fourth identification portion 16 is provided corresponding to the second through-portion and corresponds to the closed state of the limit member 21. Therefore, when the operator uses the locking assembly to fix the limit member 21, the operator can first observe the position pointed to by the indicator portion 71 on the valve stem 8 to determine the state of the limit member 21, and then use the locking assembly to pass through the through-portion corresponding to the third identification portion 15 or the fourth identification portion 16, thereby fixing the limit member 21 in the open state or the closed state.

[0061] The limit locking device provided in this embodiment is as follows: Figure 1 and Figure 3 As shown, the housing 1 includes a protective member 17 and a mounting member 18 . The mounting member 18 is disposed between the valve body 7 and the protective member 17 to connect the protective member 17 and the valve body 7 . The protective member 17 and the mounting member 18 together enclose a limiting cavity 11 .

[0062] The limit locking device of the above structure is provided with a shell 1 including a protective member 17 and a mounting member 18. The protective member 17 is a protective shell in this embodiment, and the mounting member 18 is a mounting plate in this embodiment, so that during the actual installation process of the limit locking device, the mounting member 18 can be first installed on the valve body 7, and then the protective member 17 can be installed on the mounting member 18, and finally the three can be connected together by bolts passing through the bolt holes provided on the protective member 17, the mounting member 18 and the valve body 7 in sequence. When the protective member 17 is installed on the mounting member 18, it is necessary to first sleeve the connecting member 22 on the valve stem 8, and connect and fix the connecting member 22 and the valve stem 8 through the first locking member 31, so that the limit member 21 can rotate in the limit cavity 11 surrounded by the protective member 17 and the mounting member 18 under the action of external force, and drive the valve stem 8 to rotate synchronously, so as to finally control the state of the medium in the valve body 7.

[0063] The limit locking device provided by the utility model has the following limit locking process:

[0064] First, remove the cover 5 from the housing 1, and connect the wrench 6 to the end of the valve stem 8; then, use external force to make the wrench 6 drive the valve stem 8 to rotate, and the valve stem 8 drives the connecting piece 22 and the limiter 21 connected thereto to rotate, so that the limiter 21 is in an open state or a closed state; then, remove the first sealing member 41 or the second sealing member 42 from the housing 1, and pass the second locking member 32 through the first through-hole to connect with the first limiter 211 or pass the third locking member 33 through the second through-hole to connect with the second limiter 212, so as to fix the limiter 21, so that the limiter 21 is always in an open state or a closed state; then, insert the first sealing member 41 into the first through-hole or insert the second sealing member 42 into the second through-hole to achieve the sealing of the limiter cavity 11; finally, connect the cover 5 to the housing 1. At this point, the limiter locking process of the limiter locking device is completed.

[0065] The limit locking device provided by the utility model is provided with a limit assembly 2 arranged in a housing 1 and a locking assembly arranged between the housing 1 and the limit assembly 2, wherein the housing 1 has a limit cavity 11 and a first through portion, a second through portion and a third through portion communicated with the limit cavity 11, and the limit assembly 2 is rotatably arranged in the limit cavity 11, and at the same time, the limit assembly 2 includes a limit member 21 and a connecting member 22 connected to each other, wherein the limit member 21 is provided with a first limit portion 211 and a second limit portion 212, and the limit member 21 has a first limit portion 211 and a first through portion correspondingly arranged The connecting member 22 is provided with a sleeve portion 221 and a first locking portion 222 connected with the sleeve portion 221, and when the housing 1 is connected to the valve body 7, the connecting member 22 is sleeved on the valve stem 8 on the valve body 7 through the sleeve portion 221, and the locking assembly includes a first locking member 31, a second locking member 32 and a third locking member 33, wherein, when the limiting member 21 is in the open state, the first locking member 31 can pass through the third penetration portion and the first locking portion 222 to abut against the valve stem 8, thereby fixing the connecting member 22 and the valve stem 8 to avoid When an external force is applied, the valve stem 8 idles in the sleeve portion 221. At the same time, the second locking member 32 can pass through the first penetration portion and connect with the first limiting portion 211, thereby fixing the limiting member 21 in the position when in the open state and making the medium in the valve body 7 flow. When the limiting member 21 is in the closed state, the third locking member 33 can pass through the second penetration portion and connect with the second limiting portion 212, thereby fixing the limiting member 21 in the position when in the closed state and making the medium in the valve body 7 in the isolated state. In addition, the switching of the limiting member 21 between the open state and the closed state is achieved by rotating the valve stem 8 using an external force. The reason why the valve stem 8 is connected to the switch member in the valve body 7 for controlling the on-off of the pipeline is that the connecting member 22 is driven to rotate, and the circulation of the medium in the valve body 7 is controlled by rotating the limiting member 21. In summary, by using the second locking member 32 and the third locking member 33, the limiting member 21 is fixed when the limiting member 21 is in the open state or the closed state, so that the medium in the valve body 7 is always in the circulation state or the isolation state. At the same time, it is also beneficial to improve the locking stability of the limiting locking device, and avoids the switch member in the valve body 7 from getting rid of the lock and rotating under the impact of the medium, thereby changing the state of the medium in the valve body 7.

[0066] Example 2

[0067] This embodiment provides a butterfly valve, such as Figures 1 to 4As shown, it includes a valve body 7 and the above-mentioned limit locking device. The butterfly valve of the above-mentioned structure is connected to the above-mentioned limit locking device by setting the valve body 7, that is, through the limit assembly 2 set in the shell 1 and the locking assembly set between the shell 1 and the limit assembly 2, wherein the shell 1 has a limit cavity 11 and a first through-hole, a second through-hole and a third through-hole connected to the limit cavity 11, and the limit assembly 2 is rotatably set in the limit cavity 11. At the same time, the limit assembly 2 includes a limit member 21 and a connecting member 22 connected to each other, wherein the limit member 21 is provided with a first limit portion 211 and a second limit portion 212, and the limit member 21 has an open state in which the first limit portion 211 is correspondingly provided with the first through-hole and a closed state in which the second limit portion 212 is correspondingly provided with the second through-hole, and the connecting member 22 is provided with a sleeve portion 221 and a first locking portion 222 connected with the sleeve portion 221, and the shell 1 is connected to the valve body 7. When the limit member 21 is in the open state, the first locking member 31 can pass through the third penetration portion and the first locking member 222 to abut against the valve stem 8, thereby fixing the connecting member 22 and the valve stem 8 to prevent the valve stem 8 from idling in the sleeve portion 221 under the action of external force. At the same time, the second locking member 32 can pass through the first penetration portion and connect with the first limiting portion 211, thereby fixing the limit member 21 in the open state and making the medium in the valve body 7 flow. When the limit member 21 is in the closed state, the third locking member 33 can pass through the second penetration portion and connect with the second limiting portion 212, thereby fixing the limit member 21 in the closed state and making the medium in the valve body 7 in the isolated state.

[0068] In addition, the switching of the limit member 21 between the open state and the closed state is achieved by using an external force to rotate the valve stem 8 to drive the connecting member 22 to rotate, and the circulation of the medium in the valve body 7 is controlled by rotating the limit member 21 because the valve stem 8 is connected to the switch member in the valve body 7 that controls the on and off of the pipeline. In summary, by using the second locking member 32 and the third locking member 33, the limit member 21 is fixed when the limit member 21 is in the open state or the closed state, so that the medium in the valve body 7 is always in the circulation state or the isolation state. At the same time, it is also beneficial to improve the locking stability of the limit locking device, thereby preventing the switch member in the valve body 7 from getting rid of the lock and rotating under the impact of the medium, thereby changing the state of the medium in the valve body 7.

[0069] Of course, the limit locking device provided in this embodiment can be connected not only to a butterfly valve, but also to a ball valve and other valves that realize the flow of medium in the valve body 7 by rotating the switch member.

[0070] 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. A limit locking device, characterized in that: include: A housing (1), the housing (1) being suitable for being connected to a valve body (7), the housing (1) having a limiting cavity (11), and the housing (1) being provided with a first through-portion, a second through-portion and a third through-portion which are in communication with the limiting cavity (11); A limit assembly (2) is rotatably arranged in the limit cavity (11), the limit assembly (2) comprising a limit member (21) and a connecting member (22) connected to each other, the limit member (21) is provided with a first limit portion (211) and a second limit portion (212), and the limit member (21) has an open state and a closed state, in the open state, the first limit portion (211) corresponds to the first penetration portion, in the closed state, the second limit portion (212) corresponds to the second penetration portion, the connecting member (22) is provided with a sleeve portion (221) and a first locking portion (222) connected to the sleeve portion (221), and the connecting member (22) is suitable for being sleeved on the valve stem (8) on the valve body (7) through the sleeve portion (221); A locking assembly comprises a first locking member (31), a second locking member (32) and a third locking member (33); in the open state, the first locking member (31) is suitable for passing through the third through-portion and the first locking member (222) to abut against the valve stem (8) to fix the valve stem (8) and the connecting member (22); and the second locking member (32) is suitable for passing through the first through-portion to connect with the first limiting portion (211) to fix the limiting member (21); in the closed state, the third locking member (33) is suitable for passing through the second through-portion to connect with the second limiting portion (212) to fix the limiting member (21).

2. The limit locking device according to claim 1, characterized in that: The connecting member (22) is also provided with a second locking portion (223); the locking assembly further comprises a fourth locking member (34); in the closed state, the fourth locking member (34) is adapted to pass through the third through-portion and the second locking portion (223) and abut against the valve stem (8) to fix the connecting member (22) and the valve stem (8).

3. The limit locking device according to claim 1 or 2, characterized in that: The invention also includes a sealing assembly, which includes a first sealing member (41), a second sealing member (42) and a third sealing member (43), wherein the first sealing member (41) is suitable for being inserted into the first through-hole to seal the first through-hole, the second sealing member (42) is suitable for being inserted into the second through-hole to seal the second through-hole, and the third sealing member (43) is suitable for being inserted into the third through-hole to seal the third through-hole.

4. The limit locking device according to claim 3, characterized in that: The shell (1) is also provided with a connecting portion (12) communicating with the limiting cavity (11); and further comprises a covering member (5), wherein the covering member (5) is suitable for being connected to the shell (1) via the connecting portion (12) so as to close the limiting cavity (11).

5. The limit locking device according to claim 4, characterized in that: The sealing assembly further comprises a fourth sealing member (44), wherein the fourth sealing member (44) is arranged between the cover member (5) and the shell (1) to seal the gap between the cover member (5) and the shell (1).

6. The limit locking device according to claim 5, characterized in that: When the housing (1) is connected to the valve body (7), the end of the valve stem (8) is arranged in the connecting portion (12), so that under the action of an external force, the end of the valve stem (8) drives the valve stem (8) to rotate.

7. The limit locking device according to claim 6, characterized in that: It also comprises a wrench (6), wherein the wrench (6) is suitable for being connected to the end of the valve stem (8), so that under the action of an external force, the wrench (6) drives the valve stem (8) to rotate.

8. The limit locking device according to claim 7, characterized in that: The shell (1) is also provided with a first identification portion (13) and a second identification portion (14); in the open state, the indicator portion (71) on the valve stem (8) points to the first identification portion (13); in the closed state, the indicator portion (71) on the valve stem (8) points to the second identification portion (14).

9. The limit locking device according to claim 8, characterized in that: The housing (1) is also provided with a third identification portion (15) and a fourth identification portion (16); the third identification portion (15) is arranged corresponding to the first penetration portion, and the fourth identification portion (16) is arranged corresponding to the second penetration portion.

10. The limit locking device according to claim 9, characterized in that: The housing (1) comprises a protective member (17) and a mounting member (18); the mounting member (18) is arranged between the valve body (7) and the protective member (17) to connect the protective member (17) and the valve body (7); and the protective member (17) and the mounting member (18) together enclose the limiting cavity (11).

11. A butterfly valve, characterized in that: It comprises a valve body (7) and a limit locking device as claimed in any one of claims 1 to 10.

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