CN113819325A - Quick connector with pressure relief function - Google Patents
Quick connector with pressure relief function Download PDFInfo
- Publication number
- CN113819325A CN113819325A CN202110970020.1A CN202110970020A CN113819325A CN 113819325 A CN113819325 A CN 113819325A CN 202110970020 A CN202110970020 A CN 202110970020A CN 113819325 A CN113819325 A CN 113819325A
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- China
- Prior art keywords
- pressure relief
- cylindrical shell
- spring
- sealing ring
- sealing
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Classifications
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- 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
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
- F16L37/0841—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a transversally slidable locking member surrounding the tube
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
A quick joint with a pressure relief function comprises a cylindrical shell, wherein a sealing ring is nested at the outer end part of the cylindrical shell, a pressure relief rod is mounted in the cylindrical shell, the pressure relief rod axially moves in the cylindrical shell, a support ring is nested at the end part of the inner side of the cylindrical shell, a pre-tightening spring is mounted in the cylindrical shell, one end of the pre-tightening spring abuts against the support ring, and the other end of the pre-tightening spring abuts against the sealing ring; the pressure relief rod penetrates through the support ring, the outer end of the pressure relief rod is matched with the sealing ring, so that the sealing ring is kept in a state of blocking a gap between the pressure relief rod and the cylindrical shell, the tail sleeve is arranged at the end part of the inner side of the pressure relief rod, and the pressure relief spring is arranged between the inner side of the support ring and the tail sleeve. The joint separates the pressure relief spring from the pre-tightening spring of the sealing ring independently, the pre-tightening spring provides pre-tightening and restoring force for the sealing ring independently, and the pressure relief spring only provides restoring force for the pressure relief rod, so that the requirements of various pressure relief values and drift diameter combination can be met.
Description
Technical Field
The invention relates to a quick connector of a liquid cooling system, in particular to a quick connector with a pressure relief function.
Background
The quick connector can realize quick connection or disconnection of a flow passage of the liquid cooling system without leakage, and great convenience is provided for installation and maintenance. However, when the fluid connector is disconnected, the liquid cooling system forms a closed rigid cavity, and when the ambient temperature rises, the internal pressure of the system rises sharply, so that the liquid cooling system is damaged due to overpressure, and the like.
In response to this problem, a quick connector with a self-discharging function is generally used to achieve overvoltage protection of the system. The prior self-pressure-discharging quick coupling in the market is shown in fig. 4, and the sealing rod of the structure is movably assembled in the cylindrical shell along the axial direction and is pre-tightened in the cylindrical shell under the action of spring force. When pressure exists in the liquid cooling system, internal pressure acts on the sealing rod, the pressure on the sealing rod is larger along with the increase of the internal pressure, when the acting force of the internal pressure on the sealing rod is larger than the spring force, the sealing rod is pushed out forwards under the action of the internal pressure against the acting force of the spring, a sealing element on the sealing rod moves forwards along with the sealing rod until the sealing relation with the sealing ring is removed, an internal medium flows out, the internal pressure is reduced, and the purpose of overpressure protection is achieved.
The internal pressure is generally equal to the product of the internal pressure and the area of action on the sealing rod (i.e., the area of the inner bore of the sealing ring), i.e., F = P.S, which is relieved of pressure to balance the spring force it overcomes.
The pressure relief spring of this solution also needs to provide a restoring force for the sealing ring, and the force value is limited, for example, when the quick coupling is in a structure with a small drift diameter and a small pressure relief value, the pressure relief spring force is also small, and the spring of this solution is not enough to provide the normally required restoring force for the sealing ring.
Disclosure of Invention
Aiming at the technical problem that the size of the pressure relief spring is limited, the invention aims to provide a quick joint with a pressure relief function.
The purpose of the invention is realized by adopting the following technical scheme. The quick joint with the pressure relief function comprises a cylindrical shell, wherein a sealing ring is nested at the outer end part of the cylindrical shell, a pressure relief rod is mounted in the cylindrical shell, the pressure relief rod axially moves in the cylindrical shell, a support ring is nested at the end part of the inner side of the cylindrical shell, a pre-tightening spring is mounted in the cylindrical shell, one end of the pre-tightening spring abuts against the support ring, and the other end of the pre-tightening spring abuts against the sealing ring; the pressure relief rod penetrates through the support ring, the outer end of the pressure relief rod is matched with the sealing ring to enable the sealing ring to be kept in a state of blocking a gap between the pressure relief rod and the cylindrical shell, the end part of the inner side of the pressure relief rod is provided with a tail sleeve, a pressure relief spring is arranged between the inner side of the support ring and the tail sleeve, and when the internal liquid pressure is larger than a set value, the pressure relief rod overcomes the outward movement of the pressure relief spring to further release the sealing matching relation with the sealing ring.
Furthermore, an outer sealing rubber ring is nested at the matching position of the cylindrical shell and the sealing ring and used for sealing a gap between the sealing ring and the cylindrical shell.
Furthermore, an inner sealing rubber ring is nested at the matched sealing position of the pressure relief rod and the sealing ring and used for sealing a gap between the pressure relief rod and the sealing ring.
Furthermore, the outer wall of the inner side end of the pressure relief rod is nested with a sleeve clamp spring, and the inner side end of the tail sleeve abuts against the sleeve clamp spring.
Furthermore, a clamp spring is nested on the inner wall of the end part of the inner side of the cylindrical shell, the inner side of the support ring abuts against the clamp spring, the outer side of the support ring abuts against the step of the inner wall of the cylindrical shell, and one end of the support ring abuts against one end of the pre-tightening spring.
Furthermore, a gap is reserved between the inner wall of the opposite part of the tail sleeve and the support ring and the pressure relief rod, and the pressure relief spring is sleeved on the pressure relief rod and is embedded in the gap between the tail sleeve and the support ring and the pressure relief rod; the inner walls of the back parts of the tail sleeve and the support ring are arranged on the pressure relief rod in a sliding mode.
Furthermore, the pressure relief rod is provided with a bulge close to the middle position, and when the inner side of the bulge is propped against the support ring, the pressure relief rod and the sealing ring are in a sealing state.
Further, the outer diameter of the inner side of the sealing ring is larger than that of the outer side of the sealing ring, and correspondingly, the outer diameter of the inner side of the outer end part of the cylindrical shell matched with the sealing ring is larger than that of the outer side of the outer end part of the cylindrical shell.
Compared with the prior art, the invention has the advantages that: the joint separates the pressure relief spring from the pre-tightening spring of the sealing ring independently, and the pre-tightening spring provides pre-tightening and restoring force for the sealing ring independently without being influenced by the elasticity of the pressure relief spring; the pressure relief spring is only responsible for the release function, and the pressure relief spring only provides the restoring force for the pressure relief pole, and the pressure relief pole can independently bear the effort of pressure relief spring, and the power value size of pressure relief spring elasticity just can be very nimble like this, and the power value is nimble variable, and internal pressure during the release only needs keep balanced with pressure relief spring's elasticity, just can satisfy the demand that multiple release value and latus rectum combined.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a front cross-sectional view of an embodiment of a quick connector with pressure relief features of the present invention;
FIG. 2 is a schematic structural view of the pressure relief bar and the support ring shown in FIG. 1;
FIG. 3 is a schematic view of the embodiment of FIG. 1 in a pressure relief state;
fig. 4 shows a prior art quick connector with pressure relief.
[ reference numerals ]
1-cylindrical shell, 101-step, 201-outer sealing rubber ring, 202-inner sealing rubber ring, 3-sealing ring, 4-pressure relief rod, 401-bulge, 5-pre-tightening spring, 6-support ring, 7-pressure relief spring, 8-snap spring, 9-tail sleeve, 10-sleeve snap spring, 11-prior art sealing rod, 12-prior art cylindrical shell, 13-prior art sealing ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
One embodiment of a quick coupling with a pressure relief function according to the present invention, as shown in fig. 1 to 3, includes a cylindrical housing 1, and a pressure relief rod 4 is inserted into the cylindrical housing 1, which will be described with reference to the orientation shown in the drawings. The inner wall of the right end part of the cylindrical shell is nested with a sealing ring 3, an outer sealing rubber ring 201 is arranged between the outer wall of the sealing ring and the inner wall of the cylindrical shell, and the outer sealing rubber ring 201 is nested in a ring groove in the inner wall of the cylindrical shell 1 and used for sealing the cylindrical shell 1 and the sealing ring 3. The inner diameter of the right end of the cylindrical shell close to the opening is smaller than the inner diameter of the cylindrical shell main body, and correspondingly, the outer diameter of the left end of the sealing ring 3 is larger than that of the right end, so that the sealing ring 3 is clamped in the cylindrical shell 1.
The right-hand member of pressure relief pole 4 slides and sets up in sealing ring 3, and the right-hand member external diameter of pressure relief pole 4 is greater than the external diameter and the right-hand member outer wall of pressure relief pole main part and has seted up the annular, and nested in the annular has interior sealing rubber ring 202, and when the right-hand member position of pressure relief pole 4 was in sealing ring 3, interior sealing rubber ring 202 was in the encapsulated situation to sealing pressure relief pole 4 and sealing ring 3. The right end part of the pressure relief rod moves out of the sealing ring 3, and the inner sealing rubber ring 202 releases the sealing state of the pressure relief rod 4 and the sealing ring 3. The opening of the pressure relief rod 4 close to the left end of the cylindrical shell is sleeved with a support ring 6, the outer diameter of the left end of the support ring 6 is larger than that of the right end of the support ring, and the pressure relief rod 4 and the support ring 6 can move axially relatively. An annular groove is formed in the inner wall, close to the opening, of the left end portion of the cylindrical shell, a clamp spring 8 is nested in the annular groove, the outer wall of the left end portion of the support ring is tightly attached to the inner wall of the cylindrical shell 1, the edge of the left end face of the support ring abuts against the clamp spring, the edge of the right end face of the left end portion of the support ring is matched with a step 101 in the inner wall of the cylindrical shell, and the support ring 6 is limited in the inner cavity of the cylindrical shell 1. The right end of the pressure relief rod 4 close to the support ring is provided with a bulge 401, and the right end surface of the support ring 6 is abutted against the left end surface of the bulge 401. The support ring 6 is provided with a passage for communicating the inside and outside of the cylindrical housing 1.
The pressure relief rod 4 between the support ring 6 and the sealing ring 3 is sleeved with a pre-tightening spring 5, the left end of the pre-tightening spring 5 is abutted against the support ring 6 under the action of self elasticity, and the right end of the pre-tightening spring is abutted against the sealing ring 3.
The left side part of the pressure relief rod 4 penetrates through the support ring 6 and extends out of the cylindrical shell 1, and a sleeve clamp spring 10 is nested in an outer wall groove of the left end part of the pressure relief rod 4. The left end part of the pressure relief rod 4 is sleeved with a tail sleeve 9, and the left end of the tail sleeve 9 abuts against a sleeve clamp spring 10. The pressure relief rod 4 between the tail sleeve 9 and the support ring 6 is sleeved with a pressure relief spring 7, one end of the pressure relief spring 7 is propped against the tail sleeve, and the other end of the pressure relief spring is propped against the support ring 6. Gaps are reserved between the inner wall of the left end part of the tail sleeve tightly attached to the outer wall of the pressure relief rod and between the inner wall of the right end part of the tail sleeve and the outer wall of the pressure relief rod, and the left end part of the pressure relief spring 7 is nested in the gaps. Gaps are reserved among the inner wall of the right end part of the support ring, which is attached to the outer wall of the pressure relief rod, the inner wall of the left end part of the support ring and the outer wall of the pressure relief rod, and the right end part of the pressure relief spring 7 is nested in the gaps. The pressure relief lever 4 tends to move leftward by the elastic force of the pressure relief spring 7. When the internal pressure reaches a set value, the right end part of the pressure relief rod is stressed and moves to the right side to drive the sleeve clamp spring 10 to move, so that the tail sleeve 9 is driven to move to the right, the pressure relief spring 7 is compressed, the right end part of the pressure relief rod moves out of the sealing ring 3, and pressure relief is started; when the internal pressure is lower than the set value, the pressure relief rod 4 moves leftwards and resets under the action of the restoring force of the pressure relief spring 7.
When pressure exists in the joint (the left end of the joint faces towards the inner side, and the right end of the joint faces towards the outer side), the right end part and other parts of the pressure relief rod 4 are subjected to rightward pressure under the action of an internal medium, the outward pressure applied to the pressure relief rod 4 is increased along with the increase of the internal pressure, the pressure can just overcome the friction force and the elastic force of the pressure relief spring 7, namely, the pressure set value of the joint is reached, and when the internal pressure is continuously increased, the left end face of the bulge on the pressure relief rod is gradually separated from the right end face of the support ring under the action of the internal pressure, the right end part of the pressure relief rod is pushed out of the sealing ring, when the pressure relief rod is pushed out to a certain distance, the sealing state of the inner sealing rubber ring on the pressure relief rod 4 is released, and the medium flows out to achieve the pressure relief purpose. Along with the continuation of the pressure relief process, the internal pressure reduces, and the restoring force of release spring 7 overcomes internal pressure, and decompression pole 4 resumes to original position under the effect of release spring 7, realizes sealed function once more.
The spring of the existing joint needs to provide enough restoring force for the sealing ring 3 and keep balance with the internal pressure during pressure relief, the magnitude of the force value is relatively fixed, flexible pressure relief balance force cannot be provided, and as can be known from F = P.S, the combination of specific pressure relief pressure and path cannot be met. The joint separates the pressure relief spring 7 from the pre-tightening spring 5 of the sealing ring 3 independently, and the pre-tightening spring 5 provides pre-tightening and restoring force for the sealing ring 3 independently without being influenced by the elasticity of the pressure relief spring 7. The pressure relief spring 7 is only responsible for the release function, and pressure relief spring 7 only provides the restoring force for pressure relief pole 4, and pressure relief pole 4 can independently bear the effort of pressure relief spring 7, and the power value size of 7 elasticity of pressure relief spring just can be very nimble like this, and the power value is nimble variable, and internal pressure only needs to keep balance with the elasticity of pressure relief spring 7 during the release, just can satisfy the demand that multiple release value and latus rectum combined.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a quick-operation joint of area release function, includes tube-shape casing (1), tube-shape casing (1) outer tip nestification has sealing ring (3), installation pressure relief pole (4) in tube-shape casing (1), and pressure relief pole (4) axial displacement is in tube-shape casing (1), its characterized in that: a support ring (6) is nested at the end part of the inner side of the cylindrical shell (1), a pre-tightening spring (5) is installed in the cylindrical shell (1), one end of the pre-tightening spring is abutted against the support ring (6), and the other end of the pre-tightening spring is abutted against the sealing ring (3); the pressure relief rod (4) penetrates through the support ring (6), the outer end of the pressure relief rod is matched with the sealing ring (3) to enable the sealing ring (3) to be kept in a state of blocking a gap between the pressure relief rod (4) and the cylindrical shell (1), the end part of the inner side of the pressure relief rod (4) is provided with a tail sleeve (9), a pressure relief spring (7) is arranged between the inner side of the support ring and the tail sleeve (9), and when the internal liquid pressure of the pressure relief rod (4) is larger than a set value, the pressure relief spring (7) is overcome to move outwards so as to release the sealing matching relation with the sealing ring (3).
2. The quick connector with pressure relief function as claimed in claim 1, wherein: and the outer sealing rubber ring (201) is nested at the matching position of the cylindrical shell (1) and the sealing ring (3) and is used for sealing the gap between the sealing ring (3) and the cylindrical shell (1).
3. The quick connector with pressure relief function as claimed in claim 1, wherein: an inner sealing rubber ring (202) is nested at the matched sealing position of the pressure relief rod (4) and the sealing ring (3) and is used for sealing a gap between the pressure relief rod (4) and the sealing ring (3).
4. The quick connector with pressure relief function as claimed in claim 1, wherein: the outer wall of the inner side end of the pressure relief rod (4) is nested with a sleeve clamp spring (10), and the inner side end of the tail sleeve (9) abuts against the sleeve clamp spring (10).
5. The quick connector with pressure relief function as claimed in claim 1, wherein: the inner wall of the end part of the inner side of the cylindrical shell (1) is nested with a snap spring (8), the inner side of the support ring (6) abuts against the snap spring (8), the outer side of the support ring abuts against a step (101) of the inner wall of the cylindrical shell, and one end of the support ring abuts against one end of the pre-tightening spring (6).
6. The quick connector with pressure relief function as claimed in claim 1, wherein: gaps are reserved between the inner walls of the opposite parts of the tail sleeve (9) and the support ring (6) and the pressure relief rod (4), and the pressure relief spring (7) is sleeved on the pressure relief rod (4) and is embedded in the gaps between the tail sleeve (9) and the support ring (6) and the pressure relief rod (4); the inner walls of the back parts of the tail sleeve (9) and the support ring (6) are arranged on the pressure relief rod (4) in a sliding mode.
7. The quick connector with pressure relief function as claimed in claim 1, wherein: the pressure relief rod (4) is provided with a bulge (401) close to the middle position, and when the inner side of the bulge (401) is propped against the support ring (6), the pressure relief rod (4) and the sealing ring (3) are in a sealing state.
8. The quick connector with pressure relief function as claimed in claim 1, wherein: the outer diameter of the inner side of the sealing ring is larger than that of the outer side of the sealing ring, and correspondingly, the outer diameter of the inner side of the outer end part of the cylindrical shell matched with the sealing ring (3) is larger than that of the outer side of the cylindrical shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110970020.1A CN113819325B (en) | 2021-08-23 | 2021-08-23 | Quick connector with pressure relief function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110970020.1A CN113819325B (en) | 2021-08-23 | 2021-08-23 | Quick connector with pressure relief function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113819325A true CN113819325A (en) | 2021-12-21 |
| CN113819325B CN113819325B (en) | 2023-06-27 |
Family
ID=78913487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110970020.1A Active CN113819325B (en) | 2021-08-23 | 2021-08-23 | Quick connector with pressure relief function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113819325B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0038056A2 (en) * | 1980-04-14 | 1981-10-21 | Deere & Company | Quick-acting coupling for hoses or the like |
| DE3317259A1 (en) * | 1983-05-11 | 1984-11-15 | Robert Bosch Gmbh, 7000 Stuttgart | Control valve |
| DE102009053635A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure relief valve |
| CN104500895A (en) * | 2014-12-16 | 2015-04-08 | 中航光电科技股份有限公司 | Quick coupling assembly |
| CN104696549A (en) * | 2013-12-06 | 2015-06-10 | 苏州金莱克精密机械有限公司 | High pressure washer with improved unloading valve |
| CN105953008A (en) * | 2016-06-24 | 2016-09-21 | 中航光电科技股份有限公司 | Female connector and fast connector assembly using same |
| CN205639986U (en) * | 2016-05-05 | 2016-10-12 | 徐工集团工程机械股份有限公司 | Quick -operation joint who has voltage limiting function |
| CN108488454A (en) * | 2018-05-18 | 2018-09-04 | 武汉船用机械有限责任公司 | A kind of pipeline pressure bleed-off system |
| CN108626451A (en) * | 2017-03-21 | 2018-10-09 | 天津安宇华泰科技发展有限公司 | A kind of sealed cabinet double-direction relief device |
| CN109114341A (en) * | 2017-06-22 | 2019-01-01 | 中航光电科技股份有限公司 | A kind of liquid cooling system and its quick coupling female connector |
| CN110608328A (en) * | 2018-06-15 | 2019-12-24 | 中国科学院沈阳自动化研究所 | Gas-liquid disconnecting device with wrong insertion preventing function for space experiment cabinet and using method of gas-liquid disconnecting device |
| CN110608337A (en) * | 2018-09-30 | 2019-12-24 | 中航光电科技股份有限公司 | Quick-operation joint subassembly and female joint thereof |
-
2021
- 2021-08-23 CN CN202110970020.1A patent/CN113819325B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0038056A2 (en) * | 1980-04-14 | 1981-10-21 | Deere & Company | Quick-acting coupling for hoses or the like |
| DE3317259A1 (en) * | 1983-05-11 | 1984-11-15 | Robert Bosch Gmbh, 7000 Stuttgart | Control valve |
| DE102009053635A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure relief valve |
| CN104696549A (en) * | 2013-12-06 | 2015-06-10 | 苏州金莱克精密机械有限公司 | High pressure washer with improved unloading valve |
| CN104500895A (en) * | 2014-12-16 | 2015-04-08 | 中航光电科技股份有限公司 | Quick coupling assembly |
| CN205639986U (en) * | 2016-05-05 | 2016-10-12 | 徐工集团工程机械股份有限公司 | Quick -operation joint who has voltage limiting function |
| CN105953008A (en) * | 2016-06-24 | 2016-09-21 | 中航光电科技股份有限公司 | Female connector and fast connector assembly using same |
| CN108626451A (en) * | 2017-03-21 | 2018-10-09 | 天津安宇华泰科技发展有限公司 | A kind of sealed cabinet double-direction relief device |
| CN109114341A (en) * | 2017-06-22 | 2019-01-01 | 中航光电科技股份有限公司 | A kind of liquid cooling system and its quick coupling female connector |
| CN108488454A (en) * | 2018-05-18 | 2018-09-04 | 武汉船用机械有限责任公司 | A kind of pipeline pressure bleed-off system |
| CN110608328A (en) * | 2018-06-15 | 2019-12-24 | 中国科学院沈阳自动化研究所 | Gas-liquid disconnecting device with wrong insertion preventing function for space experiment cabinet and using method of gas-liquid disconnecting device |
| CN110608337A (en) * | 2018-09-30 | 2019-12-24 | 中航光电科技股份有限公司 | Quick-operation joint subassembly and female joint thereof |
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|---|
| 吴金群;张周卫;薛佳幸;: "弹簧组弹性阀座结构分析", 机械研究与应用 * |
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| Publication number | Publication date |
|---|---|
| CN113819325B (en) | 2023-06-27 |
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