CN219935230U - Stuffing box sealing testing device - Google Patents
Stuffing box sealing testing device Download PDFInfo
- Publication number
- CN219935230U CN219935230U CN202321554641.2U CN202321554641U CN219935230U CN 219935230 U CN219935230 U CN 219935230U CN 202321554641 U CN202321554641 U CN 202321554641U CN 219935230 U CN219935230 U CN 219935230U
- Authority
- CN
- China
- Prior art keywords
- pipe body
- sealing
- cable
- stuffing box
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 title claims abstract description 99
- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 239000003566 sealing material Substances 0.000 claims abstract description 40
- 238000005056 compaction Methods 0.000 claims abstract description 16
- 230000006835 compression Effects 0.000 claims description 25
- 238000007906 compression Methods 0.000 claims description 25
- 230000007704 transition Effects 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 210000004907 gland Anatomy 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000565 sealant Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 4
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model discloses a stuffing box sealing testing device, wherein a substitute pipe body is sleeved on a cable in the stuffing box sealing testing device, one end of the substitute pipe body is abutted with a sealing material, and the outer wall of the substitute pipe body is in sealing fit with a mounting hole. The inner hole of the replacement pipe body is communicated with the sealing position between the sealing material and the cable, and the sealing condition between the sealing material and the cable is detected by performing a sealing pressure test on the position between the inner hole of the replacement pipe body and the cable. The other end of the replacement pipe body is connected with a compaction pipe body which is sleeved on the cable in the same way, a sealing piece which is sleeved on the cable is arranged between the replacement pipe body and the compaction pipe body, and the sealing piece enables the sealing piece, the replacement pipe body, the sealing material and the cable to form a sealed test space, so that the accuracy of a compaction detection result of the test space is prevented from being influenced due to the fact that leakage possibly exists between the compaction pipe body and the replacement pipe body. And the accuracy of the obtained sealing material and cable sealing pressure detection result is improved.
Description
Technical Field
The utility model belongs to the technical field of sealing equipment, and particularly relates to a stuffing box sealing testing device.
Background
Stuffing boxes are common sealing devices commonly used to seal cable joints. For the stuffing box of the cable which needs to be sealed and extended out of the underwater structural component, the underwater structural component is provided with a mounting hole, the stuffing box is connected in the mounting hole in a sealing way, and the stuffing box seals the cable passing through the stuffing box. The stuffing box comprises a sealing material and two compression nuts, wherein the two compression nuts are coaxially and alternately positioned at two ends of the mounting hole and are connected with the mounting hole, the cable is coaxially inserted into the two compression nuts, and the sealing material is filled in an annular space formed among the two compression nuts, the cable and the mounting hole to seal the cable. After the stuffing box is in sealing connection with the cable, the sealing quality between the sealing material of the stuffing box and the cable is difficult to determine, and certain potential safety hazards exist, so that a testing tool is required to be adopted to test the sealing state between the sealing material and the cable.
Among the prior art, test fixture includes: and the pipe body is connected with the mounting hole and sleeved on the cable, and one end of the pipe body, which is far away from the sealing material, is provided with a coaxial compression pipe body. A test space for communicating the sealing material to the sealing position of the cable is formed between the pipe body and the peripheral wall of the cable penetrating the pipe body, and the sealing performance of the test space reflects the sealing performance of the sealing material to the sealing position between the cable. And then the sealing state between the sealing material and the cable is tested through the test hole communicated with the test space on the pipe body. In the test fixture, the pipe body and the compaction pipe body are sealed by threads, so that leakage possibly exists, and the sealing result between the sealing material and the cable which are finally measured is difficult to ensure to be accurate.
Disclosure of Invention
The utility model aims to solve the problem that the sealing result between the measured sealing material and the cable is not accurate enough at least to a certain extent. Therefore, the utility model provides a stuffing box sealing testing device.
The embodiment of the utility model provides a stuffing box sealing test device. Be applied to with cable seal complex stuffing box, stuffing box and the mounting hole sealing connection of structure under water, stuffing box has only one gland nut, includes:
the pipe body is replaced by a pipe body, an inner hole is formed in the cable in a sleeved mode, one end of the pipe body is abutted to the sealing material of the stuffing box, and the outer wall of the pipe body is in sealing fit with the mounting hole;
the compaction pipe body is connected with the other end of the replacement pipe body and sleeved on the cable;
the sealing piece is sleeved on the cable and positioned between the replacing pipe body and the compressing pipe body, and seals the replacing pipe body, the compressing pipe body and the cable.
Optionally, the inner bore includes:
a communicating hole section for communicating a portion of the cable in contact with the sealant;
and the aperture of the mounting hole section is larger than that of the communication hole section, and the mounting hole section is matched with the sealing piece.
Optionally, the mounting hole section includes:
a smooth portion abutting against a peripheral wall of the seal member, an axial length being smaller than an axial length of the seal member;
and the threaded part is in threaded connection with the compaction pipe body.
Optionally, the inner hole further comprises a transition hole section located between the communication hole section and the mounting hole section, the aperture of the transition hole section is gradually changed, and the sealing piece is provided with a transition surface jointed with the transition hole section.
Optionally, the seal comprises a nitrile rubber seal ring.
Optionally, the stuffing box seal testing device further comprises:
the air supply pump, the air pipes with two ends respectively communicated with the air supply pump and the inner hole, and the pressure gauge arranged on the air pipes.
Optionally, the peripheral wall of the replacement tube body is provided with a test hole communicated with the inner hole and the air tube.
Optionally, the air tube is in threaded engagement with the test hole.
Optionally, the axis of the test hole is perpendicular to the axis of the bore.
Optionally, the replacement pipe body and the compaction pipe body are nuts.
The embodiment of the utility model has at least the following beneficial effects:
when the sealing effect between the sealing material in the stuffing box and the cable is required to be detected, the compression nut on one side of the stuffing box, which is close to the inside of the underwater structural part, is disassembled to expose the sealing material of the stuffing box which is arranged around the cable. And sleeving the replacement pipe body in the stuffing box sealing test device on the cable, so that one end of the replacement pipe body is abutted with the sealing material, and the outer wall of the replacement pipe body is in sealing fit with the mounting hole of the underwater structural member. The inner hole of the replacement pipe body is communicated with the contact part of the sealing material and the cable, and the sealing position between the sealing material and the cable is communicated, so that the sealing condition between the sealing material and the cable can be detected by performing a sealing pressure test on the position between the inner hole of the replacement pipe body and the cable. The other end of the replacement pipe body is connected with the compaction pipe body which is sleeved on the cable in the same way, a sealing piece which is sleeved on the cable is arranged between the replacement pipe body and the compaction pipe body, the sealing piece seals the replacement pipe body, the compaction pipe body and the cable, the sealing piece can enable the sealing piece, the replacement pipe body, the sealing material and the cable to form a sealed test space, and the problem that leakage possibly exists between the compaction pipe body and the replacement pipe body to influence the accuracy of a compaction detection result of the test space is avoided. The sealing element can be pressed by the pressing pipe body, so that stable sealing of the sealing element is facilitated, and accuracy of a sealing pressure detection result between the obtained sealing material and the cable is improved.
Drawings
FIG. 1 is a diagram showing the relationship between a stuffing box and an underwater structure according to the present utility model.
Fig. 2 is a schematic diagram of a usage state of the stuffing box seal testing device provided by the utility model.
Fig. 3 is a schematic structural diagram of an alternative pipe body according to the present utility model.
Fig. 4 is a top view of an alternative tubular body provided by the present utility model.
Reference numerals illustrate: 1. replacing the tube body; 11. an inner bore; 111. a communicating hole section; 112. a mounting hole section; 1121. a smooth portion; 1122. a threaded portion; 113. a transition bore section; 12. a test well; 2. compressing the tube body; 3. a seal; 31. a transition surface; 4. an air supply pump; 5. an air pipe; 6. a pressure gauge; 10. an underwater structure; 101. a mounting hole; 20. a stuffing box; 201. sealing material; 202. a compression nut; 30. and (3) a cable.
Detailed Description
In order to make the present utility model more clearly understood by those skilled in the art, the following detailed description of the technical scheme of the present utility model will be given by way of specific examples with reference to the accompanying drawings.
For ease of understanding, the stuffing box and the underwater structure to which the stuffing box is fitted to which the present utility model is applied will be described first.
Fig. 1 is a diagram showing a matching relationship between a stuffing box and an underwater structural member according to the present utility model, and referring to fig. 1, it is known that in an embodiment of the present utility model, an underwater structural member 10 has a mounting hole 101, a stuffing box 20 is sealingly connected in the mounting hole 101, and the stuffing box 20 seals a cable 30 passing through the stuffing box 20. The stuffing box 20 includes a sealing material 201 and two compression nuts 202, the two compression nuts 202 are coaxially and spacedly positioned at both ends of the mounting hole 101 and are connected with the mounting hole 101, the cable 30 is coaxially inserted into the two compression nuts 202, and the sealing material 201 is filled in an annular space formed between the two compression nuts 202, the cable 30 and the mounting hole 101 to seal the cable 30.
In the stuffing box 20, the compression nut 202 located on the side of the underwater structure 10 contacting the water flow may be fixedly and hermetically connected to the underwater structure 10. The sealing effect of the stuffing box 20 is increased. The gland nut 202 on the side, far away from the underwater structural member 10, in contact with water flow can be in threaded connection with the underwater structural member 10, so that the detection operation and the like of the gland 20 are facilitated. The underwater structure 10 may be the hull of some vessels or the hull of diving equipment, as the utility model is not limited in this regard. The sealant may include at least two of asbestos rope impregnated with a gum solution, polyurethane structural gum, and carbon fiber hybrid sealing filler.
Fig. 2 is a schematic diagram of a usage state of the stuffing box seal testing device provided by the present utility model, and referring to fig. 2, it can be known that an embodiment of the present utility model provides a stuffing box seal testing device. Applied to the stuffing box 20 in sealing engagement with the cable 30, the stuffing box 20 is in sealing connection with the mounting hole 101 of the underwater structure 10, and the stuffing box 20 has only one compression nut 202, comprising:
instead of the tube body 1, an inner hole 11 is provided for being sleeved on the cable 30, one end of the inner hole is abutted against the sealing material 201 of the stuffing box 20, and the outer wall is in sealing fit with the mounting hole 101.
The pressing pipe body 2 is connected with the other end of the replacing pipe body 1 and sleeved on the cable 30.
And the sealing piece 3 is sleeved on the cable 30 and positioned between the replacement pipe body 1 and the compression pipe body 2, and seals the replacement pipe body 1, the compression pipe body 2 and the cable 30.
When it is necessary to detect the sealing effect between the sealing material 201 in the stuffing box 20 and the cable 30, the compression nut 202 on the side of the stuffing box 20 close to the inside of the underwater structure 10 is detached to expose the sealing material 201 of the stuffing box 20 disposed around the cable 30. The replacement pipe body 1 in the stuffing box sealing test device is sleeved on the cable 30, one end of the replacement pipe body 1 is abutted against the sealing material 201, and the outer wall of the replacement pipe body 1 is in sealing fit with the mounting hole 101 of the underwater structural member 10. Instead of the inner hole 11 of the pipe body 1 communicating the contact part of the sealing material 201 and the cable 30 and communicating the sealing position between the sealing material 201 and the cable 30, the sealing condition between the sealing material 201 and the cable 30 can be detected by performing a sealing pressure test on the position between the inner hole 11 of the pipe body 1 and the cable 30. The other end of the replacement tube body 1 is connected with a compression tube body 2 which is sleeved on the cable 30, a sealing piece 3 which is sleeved on the cable 30 is arranged between the replacement tube body 1 and the compression tube body 2, the sealing piece 3 seals the replacement tube body 1, the compression tube body 2 and the cable 30, the sealing piece 3 can enable the sealing piece 3, the replacement tube body 1, the sealing material 201 and the cable 30 to form a sealed test space, and the problem that leakage possibly exists between the compression tube body 2 and the replacement tube body 1 to influence the accuracy of a seal pressure detection result of the test space is avoided. The pressing pipe body 2 can also press the sealing element 3, so that stable sealing of the sealing element 3 is facilitated, and accuracy of a sealing pressure detection result between the obtained sealing material 201 and the cable 30 is improved.
In some embodiments of the present utility model, the seal 3 comprises a nitrile rubber seal. The sealing element 3 adopts the nitrile rubber sealing ring, can be conveniently sleeved on the cable 30, is also convenient for being matched with the replacement pipe body 1, has a good overall sealing effect and is low in sealing cost.
In some embodiments provided by the present utility model, the seal 3 may also comprise an elastic sealing ring that fits over the cable 30. The utility model is not limited in this regard.
In some embodiments provided by the present utility model, the inner bore 11 may comprise:
the communication hole section 111 is used for communicating with the part of the cable 30 contacted with the sealing material 201.
The mounting hole section 112 has a larger diameter than the communication hole section 111, and is fitted with the seal member 3.
Instead of the inner bore 11 of the pipe body 1 including the communication hole section 111 and the mounting hole section 112, the communication hole section 111 communicates with the portion of the cable 30 that is in contact with the seal material 201, a seal pressure detection may be performed to reflect the sealing condition between the seal material 201 and the cable 30. The mounting hole section 112 with the aperture larger than the communication hole section 111 is matched with the sealing element 3, so that the sealing element 3 can be conveniently mounted, and the sealing element 3 is positioned in the mounting hole section 112, so that the mounting space occupied by the sealing element 3 can be reduced, and the whole size of the stuffing box sealing test device is more compact.
In some embodiments provided by the present utility model, the mounting hole section 112 may include:
the smooth portion 1121 abuts against the peripheral wall of the seal member 3, and has an axial length smaller than that of the seal member 3.
The screw portion 1122 is screwed to the pressure pipe body 2.
In the mounting hole section 112, the smooth portion 1121 abuts against the peripheral wall of the sealing member 3, so that the sealing member 3 can be mounted on the smooth portion 1121 conveniently, the axial length of the smooth portion 1121 is smaller than that of the sealing member 3, the sealing member 3 can be pressed in the smooth portion 1121 by the pressing pipe body 2, the sealing member 3 expands in the radial direction of the cable 30, and the sealing effect of the sealing member 3 can be effectively improved. The threaded portion 1122 in the mounting hole section 112 is in threaded connection with the compression pipe body 2, so that stable connection with the compression pipe body 2 can be achieved, the compression pipe body 2 can effectively compress the sealing element 3, a certain sealing effect is achieved through threaded fit, and the overall tightness of the stuffing box sealing test device can be improved.
In some embodiments provided by the utility model, the inner bore 11 further comprises a transition bore section 113 between the communication bore section 111 and the mounting bore section 112, the bore diameter of the transition bore section 113 being graded, and the seal 3 having a transition surface 31 conforming to the transition bore section 113.
The hole diameter of the transition hole section 113 is gradually changed between the connecting hole section and the mounting hole section 112, so that the transition between the communication hole section 111 and the mounting hole section 112 with different hole diameters can be conveniently realized, and the sealing element 3 is provided with the transition surface 31 attached to the transition hole section 113, so that the sealing performance between the sealing element 3 and the inner hole 11 of the replacement pipe body 1 can be improved. And the transition surface 31 can be pressed on the transition hole section 113 by the pressing pipe body 2, and the sealing performance is improved to a certain extent.
Referring to fig. 2, in some embodiments of the present utility model, the stuffing box seal testing device further includes:
an air supply pump 4, an air pipe 5 with two ends respectively communicated with the air supply pump 4 and the inner hole 11, and a pressure gauge 6 arranged on the air pipe 5.
The gas supply pump 4 may pump gas and transfer the gas through the gas connected to the gas supply pump 4 to the inner bore 11 of the replacement tube body 1 in communication with the gas pipe 5. The pressure gauge 6 on the air pipe 5 reflects the pressure of the air pipe 5 and the inner hole 11 communicated with the air pipe 5, and the pressure of the inner hole 11 is the pressure between the sealing material 201 and the cable 30. The pressure of the inner hole 11 is maintained for a period of time by maintaining the pressure of the air supply pump 4 unchanged, whether the indication of the pressure gauge 6 is changed or not is observed, and if the indication is unchanged, the sealing condition between the sealing material 201 communicated with the inner hole 11 of the pipe body 1 and the cable 30 is good, and the leakage is possibly lower.
It should be noted that, the air supply pump 4, the air pipe 5 and the pressure gauge 6 are only one way of performing the seal pressure detection in cooperation with the present utility model, and in other embodiments provided by the present utility model, the structure of performing the seal pressure detection in cooperation with the present utility model may be configured as an air bottle, the air pipe 5 and the pressure gauge 6, or a control valve for controlling the on/off of the air flow transmission to control the pressure unchanged may be additionally provided on the air pipe 5. The utility model is not limited in this regard.
Fig. 3 is a schematic structural diagram of a replacement tube according to the present utility model, and referring to fig. 2 and 3, in some embodiments of the present utility model, a test hole 12 is provided on a peripheral wall of the replacement tube 1 to connect the inner hole 11 and the air tube 5. The addition of test wells 12 may facilitate the implementation of a seal pressure test.
In some embodiments of the present utility model, the trachea 5 is threadably engaged with the test well 12.
The air pipe 5 is in threaded fit with the test hole 12, so that the air pipe is good in sealing performance, and the air pipe 5 and the test hole 12 are convenient to assemble and disassemble.
Referring to fig. 3, in some embodiments of the present utility model, the axis of the test hole 12 is perpendicular to the axis of the inner hole 11.
The axis of the test hole 12 is perpendicular to the axis of the inner hole 11, so that the processing of the test hole 12 on the pipe body 1 is replaced conveniently, and the gas is conveyed conveniently.
Fig. 4 is a top view of a replacement tube according to the present utility model, and referring to fig. 4, in some embodiments of the present utility model, the replacement tube 1 and the compression tube 2 are nuts.
The pipe body 1 and the compaction pipe body 2 are replaced by nuts, and the appearance of the nuts can be convenient to install and detach. It should be noted that, referring to fig. 4, the top view of the pressing tube 2 is also a hexagonal nut structure.
The installation and use of the stuffing box 20 and the cable 30 in the utility model all meet the standards of CB-T3667.1-1995 ship cabling and electrical equipment installation accessories.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The utility model provides a packing box sealing test device, its characterized in that is applied to the packing box with cable seal fit, packing box and the mounting hole sealing connection of structure under water, the packing box has only one gland nut, includes:
the pipe body is replaced by a pipe body, an inner hole is formed in the cable in a sleeved mode, one end of the pipe body is abutted to the sealing material of the stuffing box, and the outer wall of the pipe body is in sealing fit with the mounting hole;
the compaction pipe body is connected with the other end of the replacement pipe body and sleeved on the cable;
the sealing piece is sleeved on the cable and positioned between the replacing pipe body and the compressing pipe body, and seals the replacing pipe body, the compressing pipe body and the cable.
2. The stuffing box seal test device of claim 1, wherein said internal bore comprises:
a communicating hole section for communicating a portion of the cable in contact with the sealant;
and the aperture of the mounting hole section is larger than that of the communication hole section, and the mounting hole section is matched with the sealing piece.
3. The stuffing box seal test device of claim 2, wherein said mounting hole section comprises:
a smooth portion abutting against a peripheral wall of the seal member, an axial length being smaller than an axial length of the seal member;
and the threaded part is in threaded connection with the compaction pipe body.
4. The stuffing box seal testing device of claim 2, wherein said internal bore further comprises a transition bore section between said communication bore section and said mounting bore section, said transition bore section having a gradual change in bore diameter, said seal having a transition surface in engagement with said transition bore section.
5. The stuffing box seal test device of any of claims 1-4, wherein said seal comprises a nitrile rubber seal.
6. The stuffing box seal test device according to any one of claims 1 to 4, further comprising:
the air supply pump, the air pipes with two ends respectively communicated with the air supply pump and the inner hole, and the pressure gauge arranged on the air pipes.
7. The stuffing box seal testing device according to claim 6, wherein said substitute pipe body peripheral wall has a test hole communicating said inner hole and said air pipe.
8. The stuffing box seal test device of claim 7, wherein said air tube is threadedly engaged with said test bore.
9. The stuffing box seal test device of claim 7, wherein the axis of said test bore is perpendicular to the axis of said bore.
10. The stuffing box seal testing device of any one of claims 1 to 4, wherein said replacement tube and said compression tube are nuts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321554641.2U CN219935230U (en) | 2023-06-16 | 2023-06-16 | Stuffing box sealing testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321554641.2U CN219935230U (en) | 2023-06-16 | 2023-06-16 | Stuffing box sealing testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219935230U true CN219935230U (en) | 2023-10-31 |
Family
ID=88496070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321554641.2U Active CN219935230U (en) | 2023-06-16 | 2023-06-16 | Stuffing box sealing testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219935230U (en) |
-
2023
- 2023-06-16 CN CN202321554641.2U patent/CN219935230U/en active Active
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