CN108626886B - Water heater business turn over water insulation system - Google Patents
Water heater business turn over water insulation system Download PDFInfo
- Publication number
- CN108626886B CN108626886B CN201710165132.3A CN201710165132A CN108626886B CN 108626886 B CN108626886 B CN 108626886B CN 201710165132 A CN201710165132 A CN 201710165132A CN 108626886 B CN108626886 B CN 108626886B
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- Prior art keywords
- sealing
- wall
- water
- sleeve
- pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000009413 insulation Methods 0.000 title claims description 15
- 230000007306 turnover Effects 0.000 title claims description 4
- 238000007789 sealing Methods 0.000 claims abstract description 161
- 238000003466 welding Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to a water inlet and outlet insulating structure of a water heater, which comprises a water pipe, a sleeve sleeved outside the water pipe and fixed on an inner liner in a sealing way and an insulating pipe sleeved outside the sleeve, wherein an annular sealing piece is arranged between the sleeve and the water pipe and consists of an upper part and a lower part, the lower half part of the sealing piece stretches into a central through hole of the insulating pipe, and the sealing piece is in sealing connection with the sleeve and the inner wall of the insulating pipe. The invention has simple integral structure and better sealing performance, can not be damaged due to overlarge pretightening force, and effectively solves the problem of water leakage between the insulating pipe and the water inlet and outlet pipes of the liner water tank.
Description
Technical Field
The invention relates to a water heater, in particular to an insulating structure of a water inlet and outlet pipe of the water heater, and belongs to the technical field of water heater manufacturing.
Background
For the water storage type water heater with the electricity-proof wall, an inlet and outlet insulating pipe is assembled on a liner water inlet and outlet pipe, and the assembly position of the insulating pipe and the liner water tank water inlet and outlet pipe of the existing water heater adopts a mode of sealing the end face of a fiber gasket, such as the electricity-proof wall water inlet and outlet pipe disclosed in 201520867510.9. The end face sealing mode is easy to crush the fiber gasket due to overlarge pretightening force during assembly, so that the sealing between the insulating pipe and the water inlet and outlet pipe of the liner water tank is broken, water leakage is generated, and loss is brought to a user.
Disclosure of Invention
The invention mainly solves the technical problem of providing the water inlet and outlet insulating structure of the water heater, which has the advantages of simple structure, better sealing performance and effective water leakage solving.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the utility model provides a water heater business turn over water insulation system, includes water pipe, suit outside the water pipe and the sleeve pipe of sealed fixed on the inner bag and the insulating tube of suit outside the sleeve pipe be provided with annular sealing member between sleeve pipe and the water pipe, the sealing member comprises upper and lower two parts, the latter half of sealing member stretches into in the central through-hole of insulating tube, all sealing connection between sealing member and sleeve and the inner wall of insulating tube.
Further, the top of the upper half part of the sealing element stretches into the inner container and is in sealing connection with the inner container.
Further, the outer wall of the lower half part of the sealing piece is in sealing connection with the inner wall of the central through hole of the insulating tube in a welding mode.
Further, the joint of the upper half part and the lower half part of the sealing element is in a step-shaped structure.
Further, a sealing gasket is arranged between the bottom of the upper half part of the sealing element and the insulating tube, and the bottom of the upper half part of the sealing element is pressed on the sealing gasket to realize sealing connection with the insulating tube.
Further, the bottom of the sleeve is fixed on the sealing gasket in a pressing mode to achieve sealing connection with the insulating tube.
Further, at least one circle of sealing ring is arranged between the outer wall of the upper half part of the sealing piece and the inner wall of the sleeve to realize sealing connection.
Further, at least one annular mounting groove for mounting a seal ring is provided on the outer wall of the upper half of the seal member, and a lower edge of at least one of the mounting grooves has an outwardly protruding flange.
Further, a stepped gap with a wide upper part and a narrow lower part is formed between the lower edge of the mounting groove and the inner wall of the sleeve.
Further, the outer circumferential surface of the flange is circular arc-shaped in the vertical direction.
In summary, the water inlet and outlet insulating structure of the water heater provided by the invention has the following advantages compared with the prior art:
(1) The double radial sealing between the sealing element and the sleeve and the insulating tube is realized by the sealing connection between the upper half part of the sealing element and the inner wall of the sleeve and the sealing connection between the lower half part of the sealing element and the central through hole of the insulating tube, so that the double radial sealing structure is simple in integral structure, better in sealing performance, free from damage caused by overlarge pretightening force and capable of effectively solving the water leakage problem between the insulating tube and the water inlet and outlet pipes of the liner water tank.
(2) The lower edge of the mounting groove for mounting the sealing ring on the sealing element is designed to be of a flange structure, and a step-shaped gap is formed between the sealing element and the inner wall of the sleeve, so that the sealing element cannot fail due to machining errors of cylindricity, the sealing element can be suitable for the condition of larger cylindricity errors, reliable connection between the sealing element and the sleeve is further ensured, and the occurrence of water leakage is avoided.
Drawings
FIG. 1 is a schematic view of a water heater according to the present invention;
fig. 2 is a schematic structural view of an insulating structure of the present invention.
As shown in fig. 1 and 2, a water pipe 1, a sleeve 2, an insulating pipe 3, a liner 4, a sealing member 5, an upper half 5a, a lower half 5b, a central through hole 6, a seal ring 7, an installation groove 8, an outer wire insert 10, a sealing gasket 11, and a boss 12.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
as shown in fig. 1 and 2, the present invention provides a water inlet and outlet insulation structure of a water heater, which comprises a water pipe 1, a sleeve 2 and an insulation pipe 3. Wherein, water pipe 1 includes inlet tube and outlet pipe with inner bag 4 water tank intercommunication, and in the water tank of inner bag 4 was stretched into to water pipe 1's most, the bottom of water pipe 1 was installed in sleeve pipe 2, and water pipe 1 adopts insulating PPR pipe. The sleeve pipe 2 suit is in the outside of water pipe 1, and the top of sleeve pipe 2 and the bottom sealing fixed connection of inner bag 4, insulating tube 3 then suit is in the outside of sleeve pipe 2. The sleeve 2 and the liner 4 are in sealing and fixed connection in a welding mode, the outer wall of the sleeve 2 is provided with external threads, the insulating tube 3 is provided with internal threads, and the sleeve 2 and the insulating tube 3 are in threaded and fixed connection so as to be convenient to install and maintain. The insulating tube 3 has an external wire insert 10 at its bottom, which is connected to an external line (not shown) via the external wire insert 10.
The water pipe 1 passes through the sleeve pipe 2 from the below when installing and enters the water tank of the inner bag 4, be provided with annular sealing member 5 between the outer wall of water pipe 1 and the inner wall of sleeve pipe 2, pass through hot melt's welded mode fixed connection between the outer wall of water pipe 1 and the inner wall of sealing member 5, guarantee the seal between water pipe 1 and the sealing member 5. The sealing element 5 and the water pipe 1 can be obtained through integral injection molding, or can be in sealing connection through ultrasonic welding and the like.
In this embodiment, the top of the sealing element 5 is wedge-shaped and stretches into the inner container 4, and is in sealing connection with the opening at the bottom of the inner container 4 through compression, so that the sealing element is used as a first barrier at the joint of the water pipe 1 and the inner container 4, water leakage is avoided, and meanwhile, the top of the sealing element 5 can conveniently penetrate through the opening on the inner container 4 to install by utilizing the wedge-shaped shape.
The sealing element 5 is in a cylindrical shape and consists of an upper part and a lower part, the joint of the upper half part 5a and the lower half part 5b of the sealing element 5 is in a step-shaped structure, and the outer diameter of the lower half part 5b of the sealing element 5 is smaller than that of the upper half part 5 a. The bottom of the water pipe 1 is inserted into the upper half part 5a, the inner wall of the upper half part 5a is provided with a step-shaped structure, the bottom of the water pipe 1 is propped against the step of the inner wall, and a certain seal is formed between the water pipe 1 and the sealing piece 5 after the water pipe is installed, so that the smooth flow of water is ensured. The inner diameter of the lower half part 5b is the same as that of the water pipe 1, so that smooth outflow of water flow is ensured, and the resistance of the water flow is not increased.
The lower half part 5b of the sealing member 5 extends downwards into the central through hole 6 of the insulating tube 3, and sealing connection is realized between the outer wall of the lower half part 5b and the inner wall of the central through hole 6 in a hot-melt welding mode. The sealing member 5 and the insulating tube 3 may be connected to each other by ultrasonic welding or the like.
The upper half 5a of the sealing element 5 is also in sealing connection with the inner wall of the sleeve 2, in which embodiment preferably at least one ring of sealing ring 7 is arranged between the upper half 5a of the sealing element 5 and the inner wall of the sleeve 2, and a radial seal is achieved by close contact between the sealing ring 7 and the inner wall of the sleeve 2 after installation. In consideration of the manufacturing error of the sleeve 2 and the cylindricity error caused by the non-uniformity of the enamel layer of the actual production process, it is preferable to provide an upper seal ring 7 and a lower seal ring 7. Two annular mounting grooves 8 are correspondingly formed in the outer wall of the upper half 5a of the sealing member 5, and two sealing rings 7 are respectively mounted in the two mounting grooves 8.
Wherein the lower edge of the mounting groove 8 located below has an outwardly protruding flange, which makes the outer circumferential surface of the lower edge of the mounting groove 8 stepped, even if a stepped gap with a wide upper part and a narrow lower part is formed between the lower edge of the mounting groove 8 and the inner wall of the sleeve 2.
Under the action of water pressure, the first sealing ring 7 above is extruded and deformed, if the water pressure is smaller than the contact stress between the sealing ring 7 above and the inner wall of the sleeve 2, an effective static seal is formed, and if the sealing failure is caused by cylindricity error of the sealing ring 7 above, the sealing ring 7 below is displaced under the action of water pressure and moves to the low pressure side, the elastic deformation is increased, and a stepped gap formed between the lower edge of the mounting groove 8 and the inner wall of the sleeve 2 is filled and closed, so that the effective second seal is realized. The two seals are combined, so that the sealing effect is greatly improved, the connection reliability between the sealing element 5 and the sleeve 2 is ensured, and the water leakage problem between the insulating pipe and the water inlet and outlet pipe of the liner water tank is effectively solved.
In this embodiment, the outer circumference of the flange is circular arc-shaped in the vertical direction, after installation, a circular ring-shaped line contact is formed between the flange and the inner wall of the sleeve 2, so that the sealing element 5 cannot fail due to the cylindricity error, and the sealing element can be suitable for the situation that the cylindricity error is relatively large, thereby further ensuring the reliable connection between the sealing element 5 and the sleeve 2 and further avoiding the occurrence of the water leakage phenomenon.
The bottom of the upper half part 5a of the sealing element 5 can be directly in close contact with a shaft shoulder with the diameter of the inner wall of the insulating tube 3 to realize end face sealing, and the sealing among the sleeve 2, the sealing element 5 and the insulating tube 3 is realized by using the sealing ring 7 at the lowest part of the upper half part 5 a. However, in order to further ensure the sealing effect, in this embodiment, a sealing washer 11 is further disposed between the bottom of the upper half 5a of the sealing member 5 and the shoulder of the insulating tube 3, and the sealing washer 11 is preferably a fiber washer, and the bottom of the upper half 5a is pressed against the sealing washer 11 after being mounted to achieve sealing connection between the sealing member 5 and the insulating tube 3.
In the present embodiment, in order to simplify the structure of the seal member 5, the lower surface of the lower edge of the lower mounting groove 8 is directly pressed against the sealing washer 11. At the same time, the bottom of the bushing 2 is pressed against the sealing washer 11 after installation, so that a sealing connection between the bushing 2 and the insulating tube 3 is achieved. Before the sealing element 5 is welded with the insulating tube 3, the sealing gasket 11 is sleeved on the lower half part of the sealing element 5, and the sealing gasket 11 is prevented from falling down after the sealing gasket is inserted into the insulating tube 3 and clamped by the shaft shoulder of the diameter variation part of the insulating tube 3. The shoulder of the insulating tube 3 matched with the sealing gasket 11 is provided with an upward protruding boss 12, and after the installation, the boss 12 presses the sealing gasket 11 from bottom to top to further realize the sealing between the sleeve 2, the sealing element 5 and the insulating tube 3.
In this embodiment, two sealing rings 7 are disposed between the upper half 5a of the sealing member 5 and the inner wall of the sleeve 2, so as to realize radial sealing between the upper half 5a of the sealing member 5 and the sleeve 2, and the lower half 5b of the sealing member 5 is also in sealing connection with the inner wall of the central through hole 6 of the insulating tube 3, so as to realize radial sealing between the lower half 5b of the sealing member 5 and the insulating tube 3, and meanwhile, a sealing gasket 11 is further disposed between the sealing member 5, the sleeve 2 and the insulating tube 3, so as to realize end face sealing.
During installation, the insulating tube 3 is screwed on the sleeve 2, the sleeve 2 compresses the sealing gasket 11 under the action of pretightening force, so that the end face sealing effect is achieved, and meanwhile, a plurality of radial seals are formed between the sealing piece 5 and the sleeve 2 and the insulating tube 3. By adopting the multiple sealing mode, when the sealing gasket figure 11 is crushed, the sealing structure still has multiple sealing structures to realize the sealing between the insulating pipe 3 and the water inlet and outlet pipe of the water tank of the liner 4, ensure the sealing performance among the water pipe 1, the sleeve 2 and the insulating pipe 3 and thoroughly solve the water leakage problem.
In addition, the bottom of the sealing element 5 presses the shaft shoulder of the sealing gasket 11, and meanwhile, the lower edge of the mounting groove 8 for mounting the sealing ring 7 is designed to be of a circular arc flange structure and forms a special step-shaped gap with the inner wall of the sleeve 2, so that the sealing element 5 cannot fail due to machining errors of cylindricity, the sealing element can be suitable for the condition that the cylindricity errors are relatively large, reliable connection between the sealing element 5 and the water pipe 1 is further ensured, and the phenomenon of water leakage between the insulating pipe 3 and a water inlet and outlet pipe of a liner water tank is effectively avoided.
As mentioned above, similar technical solutions can be derived from the solution content presented in connection with the figures. However, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a water heater business turn over water insulation system, includes water pipe, suit outside the water pipe and sealed sleeve pipe and the insulating tube of suit outside the sleeve pipe on the inner bag, its characterized in that: an annular sealing element is arranged between the sleeve and the water pipe, the sealing element consists of an upper part and a lower part, the top of the upper half part of the sealing element extends into the inner container and is in sealing connection with the inner container, the bottom of the water pipe is inserted into the upper half part, the lower half part of the sealing element extends into the central through hole of the insulating pipe, and the sealing element is in sealing connection with the sleeve and the inner wall of the insulating pipe;
at least one ring of sealing ring is arranged between the outer wall of the upper half part of the sealing piece and the inner wall of the sleeve to realize sealing connection, at least one annular mounting groove is arranged on the outer wall of the upper half part of the sealing piece, the sealing ring is arranged in the mounting grooves, at least one of the lower edges of the mounting grooves is provided with a flange protruding outwards, and a stepped gap with a wide upper part and a narrow lower part is formed between the lower edge of the mounting groove and the inner wall of the sleeve by the flange.
2. The water heater inlet and outlet insulation structure according to claim 1, wherein: the outer wall of the lower half part of the sealing piece is in sealing connection with the inner wall of the central through hole of the insulating tube in a welding mode.
3. The water heater inlet and outlet insulation structure according to claim 1, wherein: the joint of the upper half part and the lower half part of the sealing element is in a step-shaped structure.
4. A water heater inlet and outlet insulation structure according to claim 3, wherein: and a sealing gasket is arranged between the bottom of the upper half part of the sealing element and the insulating tube, and the bottom of the upper half part of the sealing element is tightly pressed on the sealing gasket to realize sealing connection with the insulating tube.
5. The water heater inlet and outlet insulation structure according to claim 4, wherein: the bottom of the sleeve is tightly pressed and fixed on the sealing gasket to realize sealing connection with the insulating tube.
6. The water heater inlet and outlet insulation structure according to claim 1, wherein: the outer circumferential surface of the flange is arc-shaped in the vertical direction.
7. The water heater inlet and outlet insulation structure according to claim 1, wherein: the top of the sealing piece is wedge-shaped and stretches into the inner container, and sealing connection is achieved between the sealing piece and the opening at the bottom of the inner container through compression.
8. The water heater inlet and outlet insulation structure according to claim 1, wherein: the inner wall of the upper half part of the sealing element is provided with a step-shaped structure, the bottom of the water pipe is propped against the step of the inner wall, and after the water pipe is installed, the water pipe and the sealing element form a seal.
9. The water heater inlet and outlet insulation structure according to claim 1, wherein: the inner diameter of the lower half part of the sealing element is the same as the inner diameter of the water pipe.
10. The water heater inlet and outlet insulation structure according to claim 1, wherein: the outer wall of the water pipe is fixedly connected with the inner wall of the sealing element in a hot melting welding mode; or by integral injection molding; or sealing connection is realized by an ultrasonic welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165132.3A CN108626886B (en) | 2017-03-20 | 2017-03-20 | Water heater business turn over water insulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165132.3A CN108626886B (en) | 2017-03-20 | 2017-03-20 | Water heater business turn over water insulation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108626886A CN108626886A (en) | 2018-10-09 |
| CN108626886B true CN108626886B (en) | 2023-10-24 |
Family
ID=63686394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710165132.3A Active CN108626886B (en) | 2017-03-20 | 2017-03-20 | Water heater business turn over water insulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108626886B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2304697A1 (en) * | 1973-01-31 | 1974-08-15 | Georg Walz | INSULATED PIPE COUPLING AND METHOD OF MANUFACTURING THEREOF |
| US4972967A (en) * | 1990-01-16 | 1990-11-27 | Soltech, Inc. | Water heater construction and sealing device therefor |
| US5509566A (en) * | 1988-04-04 | 1996-04-23 | Soltech, Inc. | Water heater construction and sealing device therefor |
| AU5427101A (en) * | 2000-07-13 | 2002-01-17 | Rheem Australia Pty Limited | Heater element |
| DE10242643A1 (en) * | 2002-09-13 | 2004-03-25 | Heatec Thermotechnik Gmbh | Hot water generator has coiled tube inside chamber divided by insulating body into two interior parts, with burner, support tubes standing o n protuberances on base dish with seal |
| WO2010069107A1 (en) * | 2008-12-17 | 2010-06-24 | 海尔集团公司 | Heating unit for water heater |
| CN202133089U (en) * | 2011-06-02 | 2012-02-01 | 海尔集团公司 | Water heater |
| KR101267263B1 (en) * | 2013-01-03 | 2013-05-27 | (주)한도엔지니어링 | Pipe's connecting structure preventing a water leakage |
| CN202973549U (en) * | 2012-11-12 | 2013-06-05 | 广东万和电气有限公司 | Structure for connecting electric water heater with electricity-proof wall |
| CN206739629U (en) * | 2017-03-20 | 2017-12-12 | 青岛经济技术开发区海尔热水器有限公司 | A kind of water heater Inlet and outlet water insulation system |
-
2017
- 2017-03-20 CN CN201710165132.3A patent/CN108626886B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2304697A1 (en) * | 1973-01-31 | 1974-08-15 | Georg Walz | INSULATED PIPE COUPLING AND METHOD OF MANUFACTURING THEREOF |
| US5509566A (en) * | 1988-04-04 | 1996-04-23 | Soltech, Inc. | Water heater construction and sealing device therefor |
| US4972967A (en) * | 1990-01-16 | 1990-11-27 | Soltech, Inc. | Water heater construction and sealing device therefor |
| AU5427101A (en) * | 2000-07-13 | 2002-01-17 | Rheem Australia Pty Limited | Heater element |
| DE10242643A1 (en) * | 2002-09-13 | 2004-03-25 | Heatec Thermotechnik Gmbh | Hot water generator has coiled tube inside chamber divided by insulating body into two interior parts, with burner, support tubes standing o n protuberances on base dish with seal |
| WO2010069107A1 (en) * | 2008-12-17 | 2010-06-24 | 海尔集团公司 | Heating unit for water heater |
| CN202133089U (en) * | 2011-06-02 | 2012-02-01 | 海尔集团公司 | Water heater |
| CN202973549U (en) * | 2012-11-12 | 2013-06-05 | 广东万和电气有限公司 | Structure for connecting electric water heater with electricity-proof wall |
| KR101267263B1 (en) * | 2013-01-03 | 2013-05-27 | (주)한도엔지니어링 | Pipe's connecting structure preventing a water leakage |
| CN206739629U (en) * | 2017-03-20 | 2017-12-12 | 青岛经济技术开发区海尔热水器有限公司 | A kind of water heater Inlet and outlet water insulation system |
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| Publication number | Publication date |
|---|---|
| CN108626886A (en) | 2018-10-09 |
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