CN214707019U - Wall bushing - Google Patents
Wall bushing Download PDFInfo
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- CN214707019U CN214707019U CN202022918030.4U CN202022918030U CN214707019U CN 214707019 U CN214707019 U CN 214707019U CN 202022918030 U CN202022918030 U CN 202022918030U CN 214707019 U CN214707019 U CN 214707019U
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- wall bushing
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- 239000004020 conductor Substances 0.000 claims abstract description 85
- 230000000694 effects Effects 0.000 claims description 2
- 239000012212 insulator Substances 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract 1
- 210000001503 joint Anatomy 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 21
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 14
- 235000017491 Bambusa tulda Nutrition 0.000 description 14
- 241001330002 Bambuseae Species 0.000 description 14
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 14
- 239000011425 bamboo Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 7
- 208000028659 discharge Diseases 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000746 body region Anatomy 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model relates to a wall bushing, including the wall bushing body that cooperates with the wall body, outdoor barrel and indoor barrel butt joint are at the wall bushing body both ends, the end cover is set up at the sleeve barrel body both ends, in order to seal the inner chamber of sleeve barrel body, the conductor is located in the sleeve barrel body, still include middle shielding barrel, there are two and set up in the both ends department of wall bushing body coaxially with sleeve barrel body, and overhang in the outdoor barrel body and the indoor barrel body of the corresponding side, the conductor passes middle shielding barrel and both ends are all set up eccentrically and are located the sleeve barrel body axis upside, so that it is located in middle shielding barrel some position and corresponding middle shielding barrel coaxial after the conductor warp deformation, when the conductor warp deformation, the conductor middle part is flagging and can make some position and corresponding middle shielding barrel coaxial in middle shielding barrel of the middle shielding barrel in the middle shielding barrel, avoid discharging to take place and need not to set up the support insulator in the sleeve, the flashover phenomenon is avoided, and the wall bushing can stably run for a long time.
Description
Technical Field
The utility model relates to a wall bushing.
Background
Ultra-highThe wall bushing mainly comprises a bushing cylinder and a conductor arranged in the bushing cylinder, wherein the bushing cylinder comprises a transition cylinder (also called wall bushing) used for penetrating through a wall body and a left cylinder and a right cylinder which are respectively connected to two ends of the transition cylinder, one of the left cylinder and the right cylinder is used for being arranged on the outer side of the wall body, and the other one of the left cylinder and the right cylinder is used for being arranged on the inner side of the wall body. The two ends of the sleeve barrel are provided with end covers to seal the inner cavity of the sleeve barrel to contain insulating media such as SF6And in the gas sealing chamber, the conductor is arranged in the center of the sleeve barrel, and two ends of the conductor are connected to the center of the corresponding side end cover, so that the uniformity of an electric field in the wall bushing is ensured.
Because the wall bushing is generally arranged horizontally or obliquely at an angle of 10 degrees and has a longer integral length, under the action of gravity, a conductor of the wall bushing can generate flexural deformation, the distance between the peripheral surface of the conductor and a bushing cylinder is unequal, the nonuniformity of an electric field in the bushing is increased, the field intensity of the conductor is concentrated, and the discharge risk is increased. In order to solve the technical problem, in the prior art, a support insulator is additionally arranged between a sleeve cylinder and a central conductor to support the conductor so as to reduce the deflection deformation of the conductor and keep higher coaxiality between the conductor and the sleeve cylinder, but charges can be gathered on the support insulator in the long-term operation process of equipment, so that the hidden danger of flashover is caused, and the long-term operation reliability of the wall bushing is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wall bushing to the technical problem that the reliability is low among the wall bushing long-term operation in-process among the solution prior art.
The utility model discloses a wall bushing adopts following technical scheme:
a wall bushing comprises a wall bushing body, an outdoor cylinder body and a wall bushing body, wherein the wall bushing body is matched with a wall body, the outdoor cylinder body is butted at one end of the wall bushing body, the indoor cylinder is butted at the other end of the wall-through cylinder and is arranged at the inner side of the wall, the outdoor cylinder, the wall-through cylinder and the indoor cylinder form a sleeve cylinder of the wall-through sleeve, two end covers are arranged at two ends of the sleeve cylinder, so as to seal the inner cavity of the sleeve cylinder body, the conductor is positioned in the sleeve cylinder body, two ends of the conductor are respectively connected with the end covers of the corresponding ends in an electric conduction manner, the wall-penetrating sleeve also comprises two middle shielding cylinders which are coaxially arranged at the two ends of the wall-penetrating cylinder body with the sleeve cylinder body, and is suspended and extended towards the inside of the outdoor cylinder body and the indoor cylinder body on the corresponding side, the conductor passes through the middle shielding cylinder, both ends of the conductor are eccentrically arranged and are positioned on the upper side of the axis of the sleeve cylinder body, so that the conductor is coaxial with the corresponding middle shielding cylinder at a certain position in the middle shielding cylinder after being deflected and deformed.
The beneficial effects are that: set up the middle shielding sleeve coaxial with the sleeve pipe barrel, make the inside electric field of sleeve pipe increase to some extent, make the electric field intensity of wall bushing position reduce simultaneously, satisfy the air electric field criterion, in addition, with at least one end off-centre in the conductor both ends and be located sleeve pipe barrel axis upside, make the position of conductor rise, when conductor flexural deformation, the conductor middle part is flagging and can make the part that is located in the middle shielding sleeve coaxial with the middle shielding sleeve that corresponds in a certain position department, make this position conductor electric field intensity minimum, avoid the discharge phenomenon to take place, meanwhile, need not to set up supporting insulator in the sleeve pipe, the emergence of flashover phenomenon has also been avoided, ensure the operation that the wall bushing can be stable for a long time.
Further, the outdoor cylinder is different in length from the indoor cylinder, and the connection position of the conductor end portion in the longer cylinder on the end cover is higher than the connection position of the other end portion on the corresponding end cover.
The beneficial effects are that: the connecting position of the end part of the conductor in the long cylinder is lifted, and the part of the conductor in the outdoor cylinder is ensured to be coaxial with the corresponding middle shielding cylinder at a certain position after being bent and deformed.
Further, the outdoor cylinder body and the indoor cylinder body are the same in length, and the connecting positions of the two ends of the conductor are equal in height.
The beneficial effects are that: the two ends of the conductor are equal in height, so that the conductor in the outdoor cylinder and the conductor in the indoor cylinder can be coaxial with the corresponding middle shielding cylinder at a certain position after being bent and deformed.
Further, the intermediate shield cylinder has an adduction structure in which a diameter is reduced.
The beneficial effects are that: the middle shielding cylinder is internally contracted, so that the electric field intensity of the outer part of the wall bushing close to the wall bushing area can be reduced.
Further, the conductor is coaxial with the middle shielding cylinder at the minimum diameter of the inner collection structure of the middle shielding cylinder.
The beneficial effects are that: the maximum position of the field intensity in the wall bushing is the minimum diameter position of the middle shielding cylinder, and the electric field intensity is minimum when the conductor at the position is coaxial with the middle shielding cylinder and the bushing cylinder.
Furthermore, the wall bushing further comprises two end shielding cylinders, and the two end shielding cylinders are respectively arranged on the inner end faces of the two end covers and are coaxially arranged with the conductor.
The beneficial effects are that: the end shield can shield the ends of the offset conductors.
Furthermore, one end of each conductor is fixed on the corresponding end cover, and the other end of each conductor is connected to the corresponding end cover through a movable connecting structure.
The beneficial effects are that: one end of the flexible connection can enable the conductor to adapt to expansion with heat and contraction with cold.
Further, the end shielding cylinder is of a closing structure and is used for receiving debris generated by the movable connecting structure in the operation process of the wall bushing.
The beneficial effects are that: the metal debris that produces among the wall bushing operation process is accomodate in the tip shielding section of thick bamboo that has binding off structure, avoids the piece to influence wall bushing's insulating properties.
Furthermore, the movable connecting structure comprises a sliding sleeve fixed on the inner wall surface of the end cover, and the conductor is axially inserted in the sliding sleeve in a sliding fit manner to realize movable connection of the end on the corresponding end cover.
The beneficial effects are that: the movable connection between the conductor and the end cover is simply and conveniently realized by fixing the sliding sleeve on the end cover and matching the conductor with the sliding sleeve plug bush.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a middle wall bushing of the present invention;
fig. 2 is a schematic structural view of an intermediate shielding cylinder in embodiment 1 of the middle wall bushing of the present invention;
fig. 3 is a schematic structural view of an intermediate shielding cylinder in embodiment 3 of the middle wall bushing of the present invention;
the names of the components corresponding to the corresponding reference numerals in the drawings are:
1-a conductor; 2-a wall-penetrating cylinder; 3-outdoor cylinder body; 4-indoor cylinder body; 5-end cover; 6-middle shielding cylinder; 7-end shield cans; 8-a sliding sleeve; 9-large diameter end; 10-small diameter end; 11-equal diameter section; 12-conical section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as the terms first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the recitation of "comprising an … …" may occur without the exclusion of additional like elements present in the process, method, article, or apparatus that comprises the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.
The present invention will be described in further detail with reference to examples.
The utility model provides a wall bushing's embodiment 1, in this embodiment with being applied to extra-high voltage direct current engineering as an example and introduce it:
as shown in fig. 1, the wall bushing comprises a bushing body and a conductor 1 arranged inside the bushing body.
The sleeve barrel comprises a wall-penetrating barrel body 2 located in the middle, the wall-penetrating barrel body 2 is a metal pipe body, and the wall-penetrating sleeve is matched with a wall body through the wall-penetrating barrel body 2. The left end of the wall-through cylinder 2 is connected with the outdoor cylinder 3 through a flange structure, and the right end of the wall-through cylinder is connected with the indoor cylinder 4 through a flange structure. The wall-through cylinder 2, the outdoor cylinder 3 and the indoor cylinder 4 form a casing cylinder of the wall-through casing. The conductor 1 is arranged in a sleeve barrel of the wall bushing and used for realizing the transmission of current.
In order to fill the insulating medium into the sleeve cylinder, the two ends of the sleeve cylinder are provided with end covers 5, and the inner cavity of the sleeve cylinder is sealed into a closed space through the end covers 5 at the two ends. Two ends of the conductor 1 are conductively connected to the end covers 5 on the corresponding sides, so that the conductor 1 is arranged in the sleeve barrel. In this embodiment, the insulating medium filled in the wall bushing is SF6The gas, in other embodiments, the insulating medium within the wall bushing may also be insulating oil.
In order to prevent the discharge phenomenon generated inside the wall bushing, the wall bushing further includes two middle shielding cylinders 6 and two end shielding cylinders 7 disposed inside the bushing cylinder, wherein in this embodiment, the middle shielding cylinder 6 is a cone-shaped structure, and taking the middle shielding cylinder 6 on the left side as an example, as shown in fig. 1 and 2, the large-diameter end 9 of the middle shielding cylinder 6 has an outward flange, the middle shielding cylinder 6 is disposed inside the bushing cylinder by clamping and fixing the outward flange between the flange matching structures of the wall bushing 2 and the outdoor cylinder 3, bolt through holes corresponding to the flange matching structures of the wall bushing 2 and the outdoor cylinder 3 may be disposed on the outward flange of the middle shielding cylinder 6, and of course, the bolt through holes may not be disposed and may be fixed only by clamping.
The middle shielding cylinder 6 is coaxial with the sleeve cylinder, and the small-diameter end 10 of the middle shielding cylinder 6 overhangs towards the inside of the outdoor cylinder 3. The other intermediate shield drum 6 is of the same construction and is cantilevered inwardly of the indoor drum body 4. The toper structure makes middle shielding section of thick bamboo 6 inwards shrink and have the path structure, so can reduce the outside electric field strength that is close to the wall body region of wearing of wall bushing, simultaneously, 6 path end edges of middle shielding section of thick bamboo turn up and form the opening outwards, so can guarantee that the inside electric field strength of wall bushing can not be too big.
The reason why the intermediate shield tube 6 is provided is that SF6Relatively air electricityThe field intensity criterion is high, if the middle shielding cylinder 6 is not arranged, the electric field intensity in the wall bushing is lower, the electric field intensity in the area closer to the wall bushing body 2 exceeds the air electric field criterion, after the middle shielding cylinder 6 is arranged, the electric field intensity in the bushing is increased, and SF6The electric field criterion is higher, and the use requirement is met. The electric field intensity close to the position of the wall bushing cylinder body 2 is reduced, and the air electric field criterion is met.
As shown in fig. 1, two end shield cylinders 7 are provided on the inner wall surfaces of the corresponding side caps 5, respectively, so as to be cantilevered toward the inside of the sleeve cylinder, and are arranged coaxially with the ends of the conductors 1, thereby shielding the ends of the conductors 1. Different from the middle shielding cylinder 6, the mouth of the end shielding cylinder 7 is turned inwards to form a closing structure, so that the end shielding cylinder 7 has a storage function.
In order to prevent the conductor 1 from being deformed by deflection and not being coaxial with the intermediate shield cylinder 6, the conductor 1 is eccentrically arranged in the sleeve cylinder, specifically, the end of the conductor 1 is connected to the center upper side of the end cover 5, so that the end of the conductor 1 is positioned on the upper side of the axis of the sleeve cylinder, and after the conductor 1 is deformed by deflection and droops, the part of the conductor 1 corresponding to the minimum diameter of the intermediate shield cylinder 6 can be coaxial with the intermediate shield cylinder 6. The maximum position of the field intensity in the sleeve is the minimum diameter position of the middle shielding cylinder 6, and the electric field intensity is minimum when the conductor 1 is coaxial with the middle shielding cylinder 6 and the sleeve barrel. The end part shielding cylinder 7 is arranged, so that the overlarge electric field at the end part of the sleeve caused by the eccentric arrangement of the end part of the conductor 1 can be avoided. The potential of the end shielding cylinder 7 is the same as that of the conductor 1, the potential of the middle shielding cylinder 6 is the same as that of the wall-penetrating cylinder 2, and the potential distribution of the shielding cylinders is changed, so that the electric field intensity inside and outside the sleeve is influenced.
In this embodiment, the left end of the conductor 1 is fixedly connected with the left end cover 5 in a conductive manner, the right end is electrically connected with the right end cover 5 in a conductive manner through a movable connection structure, specifically, a sliding sleeve 8 is fixed on the inner wall surface of the end cover 5 on the right side of the wall bushing, the axis of the sliding sleeve 8 is parallel to the axis of the bushing barrel, and the right end of the conductor 1 is axially inserted into the sliding sleeve 8 to movably connect the end with the end cover 5, so that the conductor 1 can adapt to thermal expansion and cold contraction. In other embodiments, both ends of the conductor may be connected to the corresponding end caps through fixed connection structures, of course, both ends of the conductor may be connected to the corresponding end caps through movable connection structures, and each movable connection structure may also be a tension spring.
Because 1 one end swing joint of conductor is on corresponding the side end cover, probably produce vibration, friction and produce the metal piece in the transportation use, the tip shielding section of thick bamboo that has binding off structure can accomodate the metal piece that produces, avoids the metal piece to drop on hollow composite insulator's inner wall and influence wall bushing's shielding and insulating properties.
In this embodiment, the length of the outdoor cylinder 3 is greater than that of the indoor cylinder 4, and therefore, the fixing position of the conductor 1 on the left end cover 5 is higher than that on the right end cover 5, so as to ensure that the portion of the conductor 1 corresponding to the minimum diameter of the left middle shielding cylinder 6 is coaxial with the middle shielding cylinder 6. In other embodiments, the length of the indoor cylinder can be made to be greater than that of the outdoor cylinder according to actual use needs, at this time, the connection position of the right end of the conductor on the right end cover is made to be higher than that of the left end on the left end cover, and of course, when the lengths of the outdoor cylinder and the indoor cylinder are consistent, the positions of the two ends of the conductor are made to be consistent and are both higher than the axis of the sleeve cylinder.
The utility model provides a wall bushing's embodiment 2, this embodiment lies in with embodiment 1's difference, be provided with an end shield section of thick bamboo among embodiment 1, in this embodiment, because the conductor tip electric field is comparatively even, no longer set up an end shield section of thick bamboo in the wall bushing, in order to prevent that the metal debris that the conductor tip produced from influencing wall bushing's insulating properties, set up the storage device who is used for receiving metal debris specially on the end cover internal face, storage device can not have shielding function, if can be for insulating receiver.
The utility model provides a wall bushing's embodiment 3, this embodiment and embodiment 1's difference lie in, and in embodiment 1, middle shielding section of thick bamboo is the toper structure, and in this embodiment, the structure of middle shielding section of thick bamboo is shown as figure 3, and middle shielding section of thick bamboo is used for being equal footpath section 11 with wall bushing complex one end, and one section toper section of 12 that is of overhang end, and the edge of toper section 12 turns up, so makes middle shielding section of thick bamboo have the path structure.
The utility model provides a wall bushing's embodiment 4, this embodiment and embodiment 1's difference lie in, in embodiment 1, in order to have better shielding effect, middle shielding section of thick bamboo has the path structure, and in this embodiment, under the prerequisite that satisfies the shielding requirement, middle shielding section of thick bamboo can not have the path section, and the conductor is located in the middle shielding section of thick bamboo some department with middle shielding section of thick bamboo coaxial can.
The utility model provides a wall bushing's embodiment 5, this embodiment and embodiment 1's difference lie in, and in embodiment 1, the equal eccentric settings in conductor both ends, and in this embodiment, wall bushing whole size is shorter, and the conductor only one end eccentric settings, and the central point that the end cover was connected to one end in addition puts, and the conductor is whole to be by connecting the gesture that rises gradually to the one end of eccentric settings at the end cover center and arranges in the sleeve barrel.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A wall bushing, comprising:
the wall-through cylinder is used for matching with a wall body;
the outdoor cylinder is butted at one end of the wall-through cylinder and is used for being arranged on the outer side of the wall body;
the indoor cylinder is butted at the other end of the wall-through cylinder and is used for being arranged on the inner side of the wall body;
the outdoor cylinder, the wall-penetrating cylinder and the indoor cylinder form a sleeve cylinder of the wall-penetrating sleeve;
the two end covers are arranged at the two ends of the sleeve cylinder body so as to seal the inner cavity of the sleeve cylinder body;
the conductor is positioned in the sleeve barrel, and two ends of the conductor are respectively connected to the end covers at the corresponding ends in a conductive manner;
it is characterized by also comprising:
the middle shielding cylinders are arranged at two ends of the wall-through cylinder body coaxially with the sleeve cylinder body and overhang towards the outdoor cylinder body and the indoor cylinder body on the corresponding side;
the conductor penetrates through the middle shielding cylinder, at least one of two ends of the conductor is eccentrically arranged and is positioned on the upper side of the axis of the sleeve cylinder body, so that the conductor is coaxial with the corresponding middle shielding cylinder at a certain position in the middle shielding cylinder after being subjected to flexural deformation.
2. A wall bushing according to claim 1 wherein the outdoor cylinder is of a different length than the indoor cylinder, and wherein the conductor ends in the longer cylinder are connected at the end caps at a higher level than the other end at the corresponding end cap.
3. A wall bushing according to claim 1, wherein the outdoor cylinder is the same length as the indoor cylinder, and the connection locations of the two ends of the conductor are the same height.
4. A wall bushing according to any of claims 1-3, wherein the intermediate shielding cylinder has an inwardly-converging structure with a reduced diameter.
5. A wall bushing according to claim 4, wherein the conductor is coaxial with the intermediate shield cylinder at the smallest diameter of the inner enclosure of the intermediate shield cylinder.
6. A wall bushing according to any of claims 1-3, further comprising two end shield cans, each end shield can being disposed on an inner end face of a respective end cap and coaxially arranged with the conductor.
7. A wall bushing according to claim 6, wherein one end of the conductor is fixed to the respective end cap and the other end is connected to the respective end cap by a flexible connection.
8. The wall bushing of claim 7, wherein the end shield sleeve is of a necked-in configuration for receiving debris generated by the articulating structure during operation of the wall bushing.
9. A wall bushing according to claim 7, wherein the articulation structure comprises a sliding sleeve secured to the inner wall surface of the end cap, the conductor being axially slidably received in the sliding sleeve to effect articulation of the end against the corresponding end cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022918030.4U CN214707019U (en) | 2020-12-08 | 2020-12-08 | Wall bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022918030.4U CN214707019U (en) | 2020-12-08 | 2020-12-08 | Wall bushing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214707019U true CN214707019U (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022918030.4U Active CN214707019U (en) | 2020-12-08 | 2020-12-08 | Wall bushing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670923A (en) * | 2020-12-08 | 2021-04-16 | 平高集团有限公司 | Wall bushing |
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2020
- 2020-12-08 CN CN202022918030.4U patent/CN214707019U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670923A (en) * | 2020-12-08 | 2021-04-16 | 平高集团有限公司 | Wall bushing |
| WO2022121873A1 (en) * | 2020-12-08 | 2022-06-16 | 平高集团有限公司 | Wall bushing |
| CN112670923B (en) * | 2020-12-08 | 2022-09-30 | 平高集团有限公司 | Wall bushing |
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