CN109506050A - A kind of cable/conduit sealing device - Google Patents
A kind of cable/conduit sealing device Download PDFInfo
- Publication number
- CN109506050A CN109506050A CN201811549200.7A CN201811549200A CN109506050A CN 109506050 A CN109506050 A CN 109506050A CN 201811549200 A CN201811549200 A CN 201811549200A CN 109506050 A CN109506050 A CN 109506050A
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- frame
- cable
- conduit
- pressing plate
- sealing device
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- 238000007789 sealing Methods 0.000 title claims abstract description 39
- 238000003825 pressing Methods 0.000 claims abstract description 61
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000010425 asbestos Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L5/00—Devices for use where pipes, cables or protective tubing pass through walls or partitions
- F16L5/02—Sealing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a kind of cable/conduit sealing devices, comprising: cylinder shape frame；Seal modules are movably arranged in the frame, and surround the cable/conduit across the frame；Pressing plate is fixedly arranged on the open end of the frame；Wherein, the pressing plate while squeezing the seal modules in the frame with the frame fastener cycle, so that its is generated lateral expansion, the cable/conduit is sealed in the frame.Compared to traditional sealing technique, the present invention is remarkably improved sealability of the device under by underwater immense pressure, directly collision and a variety of harsh conditions such as sea beat and corrosion, the deepwater work demand especially suitable for submarine etc..
Description
Technical field
The present invention relates to cable/conduit technical field of sealing technology, more particularly, to a kind of cable/conduit sealing device.
Background technique
In ship, marine drilling platform and various buildings, often need to be open at the structures such as bulkhead and deck, it is right
Cable/conduit is carried out through operation.In order to seal and protect cable/conduit, it is allowed to not influenced by fire, cigarette, gas and water etc.,
In these openings, it will use to cable/conduit and run through device, i.e. cable/conduit sealing device.
The bathyscaphs such as submarine can be used to execute the tasks such as underwater investigation, sea floor exploration, sea bed exploitation and salvaging, lifesaving, and
It can be used as the movable underwater operation base of diver, or execute combat duty.When the navigation of big depth, submarine wears pressure resistance
The drainage that the cable gland of shell occurs happens occasionally, and certain hidden danger is caused to the safety of submarine.Sealing function is
The no functional reliability that will reliably be directly related to whole system on submarine.
Referring to FIG. 1, Fig. 1 is a kind of existing cable sealing device structural schematic diagram.As shown in Figure 1, the sealing device
Including cylinder shape frame 10, cable 13 is equipped in frame 10.Wherein, close filled with rubber between cable 13 and frame inner wall
Closure material 15 is also wound with asbestos yarn 14 on the surface of cable 13, by the swivel nut 12 at frame both ends that cable 13 is fixed and close
It is enclosed in frame 10.
Above-mentioned cable sealing device needs to wear plug in frame 10 in advance before cable installation, and by frame
Hole for injecting glue 11 dilute glue is injected into the gap between cable and frame inner wall, and need for a long time (about 1 month) wait dilute glue
Natural vulcanization forms rubber packing material 15, could extract plug out.Later when cable 13 is installed, then surface wrap had
The extruding of cable 13 of asbestos yarn 14 is fitted into the space that plug reserves, finally by the swivel nut 12 at frame both ends that cable 13 is fixed
In frame 10.
It can be seen that the installation procedure of above-mentioned cable sealing device is complicated, the period is long, wants to the operative skill of assembly crewman
Ask higher, and inconvenient dismounting, this is because the rubber packing material 15 after vulcanization be it is hard solid-state like, as device needs to change
When, difficulty is big, and is easily damaged cable.In particular, its sealing effect is poor, it is difficult to be resistant to pressure when the big depth of submarine is navigated by water
Impact, to seriously affect the maximum diving depth of submarine.
Summary of the invention
It is an object of the invention to overcome drawbacks described above of the existing technology, a kind of cable/conduit sealing device is provided,
To improve the sealability under big compression shock.
To achieve the above object, technical scheme is as follows:
A kind of cable/conduit sealing device, comprising:
Cylinder shape frame；
Seal modules are movably arranged in the frame, and surround the cable/conduit across the frame；
Pressing plate is fixedly arranged on the open end of the frame；
Wherein, the pressing plate while squeezing the seal modules in the frame with the frame fastener cycle,
So that it is generated lateral expansion, the cable/conduit is sealed in the frame.
Further, the frame is both ends open, and two pressing plates are divided into two open ends of the frame.
Further, the pressing plate is Hafu-type pressing plate, and the seal modules are Hafu-type seal modules.
Further, the pressing plate is equipped with the fitting surface structure cooperated with the frame end face and squeezes into the frame
Step surface structure.
Further, one or more cable/conduit is equipped in the frame, the pressing plate and seal modules are according to electricity
Cable/pipeline quantity, diameter and distribution form, the multiple split type structures for being arranged respectively to monomer structure or mutually splicing.
Further, the pressing plate and seal modules have the pass matched with the cable/conduit.
Further, the inner wall of the frame is protruded above keeps off equipped with lattice.
Further, the section of the frame is round, polygon or abnormal shape.
Further, the seal modules are elastic rubbery body.
It further, is to be threadedly coupled between the pressing plate and the frame.
The present invention utilizes the extrusion expansion characteristic of seal modules, while carrying out the encapsulation of frame end face using pressing plate, to
It is gradually squeezed in frame, makes seal modules along lateral constantly expansion, so that cable/conduit is sealed in frame.The present invention can
Pressure-resistant performance when sealing is increased to 130 kg/cms by existing 3~4 kg/cm, compared to traditional
Sealing technique is remarkably improved device by underwater immense pressure, directly collision and a variety of harsh conditions such as sea beat and corrosion
Under sealability, the deepwater work demand especially suitable for submarine etc..
Detailed description of the invention
Fig. 1 is a kind of existing cable sealing device structural schematic diagram.
Fig. 2 is a kind of cable/conduit schematic diagram of sealing device of a preferred embodiment of the present invention.
Fig. 3 is a kind of circuit theory schematic diagram of a preferred embodiment of the present invention one.
Fig. 4 is a kind of circuit theory schematic diagram of a preferred embodiment of the present invention two.
Fig. 5 is a kind of seal modules structural schematic diagram of a preferred embodiment of the present invention one.
Fig. 6 is a kind of seal modules structural schematic diagram of a preferred embodiment of the present invention two.
Fig. 7 is a kind of pressure plate structure schematic diagram of a preferred embodiment of the present invention one.
Fig. 8 is a kind of pressure plate structure schematic diagram of a preferred embodiment of the present invention two.
Fig. 9 is the assembled state decomposition diagram of device in Fig. 2.
Figure 10 is a kind of cable/conduit sealing device assembled state decomposition diagram of a preferred embodiment of the present invention two.
Figure 11 is the assembled state schematic diagram of device in Figure 10.
Figure 12 is two kinds of cable/conduit sealing device end face form schematic diagrames of a preferred embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in further detail.
It should be noted that in following specific embodiments, when describing embodiments of the invention in detail, in order to clear
Ground indicates structure of the invention in order to illustrate, spy does not draw to the structure in attached drawing according to general proportion, and has carried out part
Amplification, deformation and simplified processing, therefore, should be avoided in this, as limitation of the invention to understand.
In specific embodiment of the invention below, referring to FIG. 2, Fig. 2 is one kind of a preferred embodiment of the present invention
Cable/conduit schematic diagram of sealing device.As shown in Fig. 2, a kind of cable/conduit sealing device of the invention, comprising: frame
20, the main components such as seal modules 25 and pressing plate 24.
Please refer to Fig. 2.Frame 20 is tubular or cup-shaped structure, has the inner cavity of perforation.At least one end of frame 20 is
Closing or substantially closed open end are carried out by pressing plate 24.If the only one end of frame 20, which passes through pressing plate 24, carries out closing or big
Closing is caused, then the other end of frame 20 can be closed end, but need passing through on the closed end pre- testing cable and/or pipeline 23
Hole.The finish of 20 inner wall surface of frame is preferably high.
Seal modules 25 are loaded in frame 20 using manner, and pass through the side of the cable/conduit 23 of frame 20
It is all surrounded, so that the gap between cable/conduit 23 and frame inner wall is carried out rough filling, but does not need to adopt
With interference fit.Seal modules 25 are preferably provided with the surface profile matched with 20 inner wall of frame and cable/conduit 23.Sealed mould
Block 25 is prefabricated component, can be elasticity or soft rubber body or other applicable sealing material Materials.Seal modules 25 should have quite
Length, with after being compressed axially, along laterally generating enough volume expansions.Seal modules 25 can take the monomer of pull-on type
Structure；Seal modules 25 can also take knockdown multiple seperated splicing constructions, i.e. seal modules 25 can be Hafu-type sealed mould
Block 25.
Pressing plate 24 is fixedly mounted on each open end of frame 20, closes for the end face to frame 20.If
Frame 20 is both ends open, then needs to be respectively arranged in two open ends of frame 20 using two pressing plates 24.If frame
20 have one end be closed end, then the end no longer needs to be closed by pressing plate 24, and only need to using its own structure into
The closing of row end face, and in extruding of another open end of frame 20 by pressing plate 24, the seal modules 25 in frame 20 are generated
Axial reversed squeezing action.Pressing plate 24 can take the monomer structure of pull-on type；Pressing plate 24 can also take knockdown multiple points
Body splicing construction, i.e. pressing plate 24 can be Hafu-type pressing plate 24.
Please refer to Fig. 2 and Fig. 9.When the shell for needing for 23 sealing device of cable/conduit to be mounted on submarine, water craft etc.
Or when on bulkhead, frame 20 first can be welded on punch position.Then the cable/conduit of seal modules 25 and pressing plate 24 will be cased with
23 penetrate in frame 20；Alternatively, if using Hafu-type seal modules 25 and pressing plate 24, can be worn in cable/conduit 23
After entering frame 20, then will be at the gap between the filling cable/conduit 23 of seal modules 25 and 20 inner wall of frame of Hafu-type.It connects
, pressing plate 24 and the end face of frame 20 are fastened.It bolt 22 can be used is screwed into screw hole 26 and fastened.Pressing plate 24 with
In the fastener cycle of frame 20,24 stress of pressing plate will be moved axially simultaneously into frame 20, and gradually in extruded frame 20
Seal modules 25 make seal modules 25 constantly generate lateral volume expansion, until by cable/conduit 23 and 20 inner wall of frame it
Between gap swelling, so that cable/conduit 23 is firmly sealed in frame 20.
Please refer to Fig. 3.In a preferred embodiment of the present invention, lattice gear 21, lattice gear 21 can be equipped on the inner wall of frame 20
The ring-type of protrusion can be formed along 20 inner wall of frame.When frame 20 is longer, can will be separated into inside frame 20 using lattice gear 21 more
A part can enhance the structural strength and stability of frame 20, and can be respectively charged into seal modules 25 from the both ends of frame 20, with
The appropriate length for shortening seal modules 25, improves uniformity when 25 lateral expansion of seal modules, and facilitate installation.Frame 20
End face is machined with the screw hole 26 matched with bolt 22.
Please refer to Fig. 4.Left figure in Fig. 4 is the axial view of frame 20, and right figure is the end view of frame 20.In this hair
In bright another preferred embodiment, when frame 20 is shorter, lattice gear can not be set on the inner wall of frame 20.Add on the end face of frame 20
Work has multiple screw holes 26, can be installed by the pressing plate 24 corresponding with the side of bolt 22.The frame 20 is suitable for relatively thin bulkhead.
Please refer to Fig. 5.Left figure in Fig. 5 is the lateral view of seal modules 25, and right figure is that the end face of seal modules 25 regards
Figure.In a preferred embodiment of the present invention, seal modules 25 use the seal modules 25 of two Hafu-types.This is for single
A kind of seal modules composite structure of cable or pipeline 23.At this point, gap between 20 inner wall of cable/conduit 23 and frame compared with
It is small, the desirable flake of seal modules 25.The seal modules 25 of two Hafu-types are wrapped from the two sides of unit cable or pipeline 23
In the gap enclosed and closed up, and be fitted between 20 inner wall of cable/conduit 23 and frame.
Please refer to Fig. 6.Left figure in Fig. 6 is the end view of seal modules 25, and right figure is the lateral view of seal modules 25
Figure.In another preferred embodiment of the present invention, seal modules 25 use the seal modules 25 of 3 Hafu-types.This is for more
25 composite structure of a kind of seal modules of root cable or pipeline 23 (such as cable or pipeline 23 of 5 different-diameters of diagram).
At this point, frame 20 is cylindrical shape, the seal modules 25 of 3 Hafu-types according to the quantity of multi-cable or pipeline 23, diameter and divide
Cloth form is arranged to the multiple Split module structures mutually spliced, and processes between the mating surface of every two seal modules 25
The pass 27 matched out with cable/conduit 23.
Please refer to Fig. 7.Left figure in Fig. 7 is the lateral view of pressing plate 24, and right figure is the end view of pressing plate 24.In this hair
In a bright preferred embodiment, the pressing plate 24 that pressing plate 24 uses 2 Hafu-types is matched.This is for unit cable or pipeline 23
A kind of pressing plate composite structure.At this point, frame 20 is cylindrical shape, also split is circle to the pressing plate 24 of two Hafu-types.Pressing plate 24
On be machined with 28 structure of fitting surface of 20 end face of frame cooperation and 29 structure of step surface for being squeezed into frame 20, this
Sample, the pressing plate 24 after split are provided with flange form.The pressing plate 24 of two Hafu-types is from the two sides of unit cable or pipeline 23
Surrounded and closed up, and from 20 end edge of frame using fitting surface 28 install, lateral dominance with step surface 29 to cable/conduit 23 with
Gap between 20 inner wall of frame enters in frame 20, is formed and is squeezed to seal modules 25.Above-mentioned peace is completed using bolt 22
Dress and extrusion process.The mounting hole 30 by bolt 22 is machined in 28 structure of fitting surface.
Please refer to Fig. 8.Left figure in Fig. 8 is the end view of pressing plate 24, and right figure is the lateral view of pressing plate 24.In this hair
In bright another preferred embodiment, the pressing plate 24 that pressing plate 24 uses 3 Hafu-types is matched.This is for multi-cable or pipeline
A kind of pressing plate composite structure of 23 (such as cables or pipeline 23 of 5 different-diameters of diagram).At this point, frame 20 is cylinder
Shape, also split is circle to the pressing plate 24 of three Hafu-types.The pressing plate 24 of three Hafu-types can be according to multi-cable or pipeline 23
Quantity, diameter and distribution form are arranged to the multiple Split module structures mutually spliced, and in the spelling of 24 module of every two pressing plate
The pass 31 matched with cable/conduit 23 is processed between conjunction face.
Referring to FIG. 10, Figure 10 is a kind of cable/conduit sealing device formed using the component of above-mentioned Fig. 4,6 and 8
Assembled state decomposition diagram.As shown in Figure 10, when needing 23 sealing device of cable/conduit being mounted on submarine, water craft
Deng relatively thin bulkhead on when, frame 20 first can be welded on punch position.Then using the seal modules 25 of Hafu-type and pressure
The seal modules 25 of three Hafu-types are inserted cable/conduit after multi-cable/pipeline 23 penetrates frame 20 by plate 24 one by one
At gap between 23 and 20 inner wall of frame, and it is directed at pass.Then, the pressing plate 24 of six Hafu-types is divided to is two groups, from frame
End face of the both ends of frame 20 respectively with frame 20 is fastened.Bolt 22 can be used, it is equally distributed more on 20 end face of frame
It is screwed into a screw hole 26 to be fastened.In the fastener cycle of each pressing plate 24 and frame 20, generation when pressing plate 24 is fastened
Axial force, will axially simultaneously be moved into frame 20, and gradually three seal modules 25 in extruded frame 20, and make to seal
Module 25 constantly generates lateral volume expansion, until by the gap swelling between 20 inner wall of cable/conduit 23 and frame, thus
Five cable/conduits 23 are firmly sealed in frame 20.Figure 11 is the assembled state schematic diagram of device in Figure 10.In Figure 10
Left figure be assembled state lateral view, right figure be assembled state end view.
Figure 12 is please referred to, Figure 12 is that two kinds of cable/conduit sealing device end face forms of a preferred embodiment of the present invention are shown
It is intended to.As shown in the upper figure of Figure 12, in a frame 20 with elliptic cross-section, a series of cable/conduits 23 are equipped with,
And use the seal modules 25 and pressing plate 24 of a series of Hafu-types with matching.As shown in the following figure of Figure 12, at one
In frame 20 with rectangular section, a series of cable/conduits 23 are equipped with, and use a series of Houghs with matching
The seal modules 25 and pressing plate 24 of formula.Also, the device uses the combining form of three layers of frame 20 superposition, every layer of frame 20
Between connect using being weldingly connected.Above-mentioned stream oriented device is all suitable for scene when cable/conduit needs a large amount of concentration crossing cabins.
As optional embodiment, the section of frame 20 can be round, polygon or abnormal shape；Seal modules 25 are prefabricated
Part can be elasticity or soft rubber body or other applicable sealing material Materials.
In conclusion the present invention utilizes the extrusion expansion characteristic of seal modules, the encapsulation of frame end face is being carried out using pressing plate
While, it is gradually squeezed into frame, makes seal modules along lateral constantly expansion, so that cable/conduit is sealed in frame.
Pressure-resistant performance when sealing can be increased to 130 kg/cms, phase by existing 3~4 kg/cm by the present invention
Than traditional sealing technique, it is a variety of by underwater immense pressure, directly collision and sea beat and corrosion etc. to be remarkably improved device
Sealability under harsh conditions, the deepwater work demand especially suitable for submarine etc..
Above-described to be merely a preferred embodiment of the present invention, the patent that the embodiment is not intended to limit the invention is protected
Range is protected, therefore all with the variation of equivalent structure made by specification and accompanying drawing content of the invention, similarly should be included in
In protection scope of the present invention.
Claims (10)
1. a kind of cable/conduit sealing device characterized by comprising
Cylinder shape frame；
Seal modules are movably arranged in the frame, and surround the cable/conduit across the frame；
Pressing plate is fixedly arranged on the open end of the frame；
Wherein, the pressing plate while squeezing the seal modules in the frame, make it with the frame fastener cycle
Lateral expansion is generated, the cable/conduit is sealed in the frame.
2. cable/conduit sealing device according to claim 1, which is characterized in that the frame be both ends open, two
The pressing plate is divided into two open ends of the frame.
3. cable/conduit sealing device according to claim 1, which is characterized in that the pressing plate is Hafu-type pressing plate, institute
Stating seal modules is Hafu-type seal modules.
4. cable/conduit sealing device according to claim 1, which is characterized in that the pressing plate is equipped with and the frame
The fitting surface structure of end face cooperation and the step surface structure squeezed into the frame.
5. cable/conduit sealing device according to claim 1, which is characterized in that be equipped in the frame one to multiple
A cable/conduit, the pressing plate and seal modules are arranged respectively to list according to the quantity of cable/conduit, diameter and distribution form
Body structure or the multiple split type structures mutually spliced.
6. cable/conduit sealing device according to claim 1, which is characterized in that the pressing plate and seal modules have
The pass matched with the cable/conduit.
7. cable/conduit sealing device according to claim 1, which is characterized in that the inner wall of the frame, which protrudes above, to be set
There is lattice gear.
8. cable/conduit sealing device according to claim 1, which is characterized in that the section of the frame is round, more
Side shape or abnormal shape.
9. cable/conduit sealing device according to claim 1, which is characterized in that the seal modules are elastic rubber
Body.
10. cable/conduit sealing device according to claim 1, which is characterized in that between the pressing plate and the frame
To be threadedly coupled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549200.7A CN109506050A (en) | 2018-12-18 | 2018-12-18 | A kind of cable/conduit sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549200.7A CN109506050A (en) | 2018-12-18 | 2018-12-18 | A kind of cable/conduit sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN109506050A true CN109506050A (en) | 2019-03-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811549200.7A Pending CN109506050A (en) | 2018-12-18 | 2018-12-18 | A kind of cable/conduit sealing device |
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| Country | Link |
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| CN (1) | CN109506050A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685629A (en) * | 2021-10-26 | 2021-11-23 | 江苏景瑞农业科技发展有限公司 | Air cooling duct fast connecting structure for air cooling unit |
| CN115030552A (en) * | 2022-06-28 | 2022-09-09 | 科兴建工集团有限公司 | Winding and compaction type glue injection plugging structure and method for cable bushing penetrating through outer wall |
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| CN113685629A (en) * | 2021-10-26 | 2021-11-23 | 江苏景瑞农业科技发展有限公司 | Air cooling duct fast connecting structure for air cooling unit |
| CN113685629B (en) * | 2021-10-26 | 2021-12-28 | 江苏景瑞农业科技发展有限公司 | Air cooling duct fast connecting structure for air cooling unit |
| CN115030552A (en) * | 2022-06-28 | 2022-09-09 | 科兴建工集团有限公司 | Winding and compaction type glue injection plugging structure and method for cable bushing penetrating through outer wall |
| CN115030552B (en) * | 2022-06-28 | 2024-05-03 | 科兴建工集团有限公司 | Outer wall cable bushing penetrating winding compaction type glue injection plugging structure and method |
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