CN112018714A - Cable joint protection box - Google Patents
Cable joint protection box Download PDFInfo
- Publication number
- CN112018714A CN112018714A CN202010878571.0A CN202010878571A CN112018714A CN 112018714 A CN112018714 A CN 112018714A CN 202010878571 A CN202010878571 A CN 202010878571A CN 112018714 A CN112018714 A CN 112018714A
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- protection
- fire
- cable
- outside
- cable joint
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
The invention discloses a cable joint protection box which comprises a shell, wherein the shell comprises a protection cavity which is internally provided with a cable joint and used for protecting the cable joint, the protection cavity is provided with a penetration hole which penetrates through the inside and the outside for a cable to penetrate, the shell is provided with a heat dissipation hole which penetrates into the protection cavity from the outside, a heated expansion plug is fixed in the heat dissipation hole, the heated expansion plug is provided with a ventilation hole which penetrates through the inside and the outside, when the ambient temperature of the heated expansion plug reaches a first preset temperature value, the heated expansion plug can expand to seal the ventilation hole so as to seal the heat dissipation hole, and when the internal pressure is increased to reach a preset pressure difference from the inside to the outside, the heated expansion plug can be separated from the heat dissipation. The thermal expansion plug is sealed when the internal temperature is too high, so that the fire is effectively prevented from spreading, the thermal expansion plug can be bounced off under high pressure, the shell is prevented from exploding through pressure relief, the service life is effectively prolonged, and a better fireproof ventilation effect is achieved.
Description
Technical Field
The invention relates to the technical field of cable connection, in particular to a cable joint protection box.
Background
With the development and planning of cities, cable tunnels are used more and more widely. The cables in the cable tunnel are dense, and the ignition result is serious. Of which about 70% of tunnel cables catch fire due to cable splice explosions. Therefore, the fire and explosion prevention of the cable joint in the cable tunnel is particularly important. At present, a fire-proof and explosion-proof box is often installed at a cable joint. And present fire and explosion prevention box is difficult fine to carry out fire and explosion protection, and ventilation effect is not good moreover, easily causes the box internal temperature to rise, increases the conflagration risk.
In summary, how to effectively solve the problems of poor fireproof and ventilation effects and easy explosion of the existing cable joint protection box is a problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a cable splice protection box, which can effectively solve the problems of poor fireproof and ventilation effects and easy explosion of the existing cable splice protection box.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a cable joint protection box, includes the casing, the casing has the protection chamber that is used for protecting cable joint including inside, the protection chamber has the penetration mouth that link up inside and outside in order to be used for the cable to penetrate, be provided with on the casing and link up extremely from the outside the louvre in the protection chamber, the louvre internal fixation has the inflation stopper of being heated, be provided with the inside and outside ventilation hole of link up on the inflation stopper of being heated, when being heated the inflation stopper and reaching first predetermined temperature value at ambient temperature, can expand to sealing the ventilation hole, in order to seal the louvre to when can increasing inside and outside pressure differential to reach predetermined pressure differential, the inflation stopper of being heated can break away from along the pressure differential direction the louvre.
In this cable joint protection box, in the application, when cable joint normally worked, this moment, cable joint's normal intensification, and when leading to the protection chamber intensification, the inflation stopper that is heated this moment is in not expanded state or not expanded to sealing the ventilation hole, just dispels the heat through the ventilation hole. And rise gradually along with inside temperature to when reaching harm peripheral environment, the expansion plug that is heated this moment, because high temperature is heated, lead to the inflation, so that the ventilation hole is closed in order to seal the louvre, with the inside and outside gas exchange of prevention, and then avoid inside intensity of a fire or high-temperature gas to transmit to casing outside environment, thereby prevent the intensity of a fire to distribute, and avoid on fire. And when the cable joint rises in temperature fast to cause inside atmospheric pressure to rise fast, and approach the explosion pressure difference, the pressure difference can push away the thermal expansion stopper this moment, and the louvre ventilates completely this moment, with the pressure release to the protection chamber fast, avoids the explosion. So this cable joint protection box through setting up the louvre to set up the thermal expansion stopper in the louvre, with in inside high temperature, seal when producing the intensity of a fire promptly, prevent the intensity of a fire effectively to stretch, and when inside temperature sharply risees and leads to atmospheric pressure to rise, can bounce open under the high pressure, prevent the casing explosion through the pressure release, and then improve life effectively, play better fire prevention ventilation effect. The cable joint protection box can effectively solve the problems that the existing cable joint protection box is poor in fireproof and ventilation effects and easy to explode.
Preferably, the heated expansion plug is hermetically adhered to the hole wall of the heat dissipation hole along the circumferential direction through silicon-free gel.
Preferably, a fireproof moisture absorption material layer is arranged at the bottom of the protection cavity.
Preferably, the fireproof moisture absorption material layer is a mixture layer containing calcium oxide, calcium carbonate and aluminum hydroxide powder.
Preferably, the housing is a glass fibre reinforced plastic housing.
Preferably, the upper cavity wall of the protection cavity is adhered with a fireproof heat absorption blanket through a bonding agent, so that when the heated temperature reaches a second preset temperature, the bonding agent is disabled, and the fireproof heat absorption blanket falls to cover the cable joint.
Preferably, the outer side of the shell is wrapped with a layer of the fireproof blanket.
Preferably, the protection device further comprises a temperature and humidity sensor for measuring the temperature and the humidity in the protection cavity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cable splice protection box according to an embodiment of the present invention;
FIG. 2 is a schematic view of the installation of a heated expansion plug provided by an embodiment of the present invention;
fig. 3 is a schematic end view of a thermally expansive plug according to an embodiment of the present invention.
The drawings are numbered as follows:
the heat insulation and insulation device comprises a shell 1, a protection cavity 2, a penetration opening 3, heat dissipation holes 4, ventilation holes 5, a fireproof and moisture absorption material layer 6, a fireproof and heat absorption blanket 7 and a heated expansion plug 8.
Detailed Description
The embodiment of the invention discloses a cable joint protection box which can effectively solve the problems that the existing cable joint protection box is poor in fireproof and ventilation effects and prone to explosion.
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.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a cable connector protection box according to an embodiment of the present invention; FIG. 2 is a schematic view of the installation of a heated expansion plug provided by an embodiment of the present invention; fig. 3 is a schematic end view of a thermally expansive plug according to an embodiment of the present invention.
In one embodiment, the present embodiment provides a cable splice protection enclosure for enclosing and protecting a cable splice. Specifically, the cable joint protection box mainly forms a protection cavity 2 through a shell 1, and a cable joint is located in the protection cavity 2 and is protected in a certain sealing mode through the protection cavity 2.
The casing 1 generally mainly includes an upper casing and a lower casing, the casing cavities of the upper casing and the lower casing are oppositely arranged to form a protection cavity 2, the upper casing and the lower casing can be bonded, bolted or welded, and the like, specifically, the casing 1 can be arranged according to requirements, and has certain fire-resistant and heat-resistant capabilities and certain anti-explosion capabilities. Of course, the housing 1 may be a left housing and a right housing separated from each other in the cable extending direction, or may be an integrally molded housing.
Wherein the protection chamber 2 has the penetration 3 that link up inside and outside in order to be used for the cable to penetrate, is generally provided with a penetration 3 respectively at the relative both ends in protection chamber 2 to two cables for connecting penetrate in order to converge in protection chamber 2 from two penetrations 3 respectively and connect. The cables are typically sealed as they pass through the entry port 3.
Wherein casing 1 is last to be provided with heat dissipation hole 4 that link up to in the protection chamber 2 from the outside, and heat dissipation hole 4 internal fixation has the thermal expansion stopper 8, and thermal expansion stopper 8 adopts the thermal expansion material to make, and the coefficient of expansion of thermal expansion material should not undersize to guarantee to have certain inflation volume at thermal expansion stopper 8, it is specific, wherein the thermal expansion material is formed by epoxy, multiple thermoplastic polymer and vermiculite, expandable graphite etc. complex.
Wherein be provided with the ventilation hole 5 inside and outside lining up on the expansion plug 8 that is heated to make protection chamber 2 ventilate inside and outside through ventilation hole 5, with the outside heat dissipation through ventilation hole 5. Wherein the ventilation hole 5 should not too big, should not too little, should make heated expansion stopper 8 when ambient temperature reaches first predetermined temperature value, can expand to seal ventilation hole 5 to realize sealing louvre 4, prevent that the heat outwards scatters and disappears. The first predetermined temperature value is set as required, and is specifically set in a specific application environment, so that the gas reaches the first predetermined temperature and is easy to cause fire when being transmitted to the outside, and the first predetermined temperature value is generally between 300 ℃ and 400 ℃. It should be noted that, in order to facilitate the closing of the vent hole 5 and ensure the ventilation effect, it is preferable that the thermal expansion plug 8 is provided with a honeycomb or array of vent holes 5, so as to ensure that when the ambient temperature reaches the first predetermined temperature, the thermal expansion plug 8 expands towards the hole cavity of the vent hole 5 to close the hole cavity of the vent hole 5, and the hole cavity of the vent hole 5 is closed, so that the whole vent hole 4 is completely closed by the thermal expansion plug 8. It should be noted that the thermally expandable plug 8 should have a certain fire-proof capability because it is highly likely to be in a fire.
Wherein the thermal expansion plug 8 is plugged in the heat dissipation hole 4 and fixed in the heat dissipation hole 4, so that when the internal pressure increases to the internal and external pressure difference and reaches the predetermined pressure difference, the thermal expansion plug 8 can be separated from the heat dissipation hole 4 along the pressure difference direction before the shell is broken, namely, the pressure difference when the shell 1 is broken is larger than the pressure difference when the thermal expansion plug 8 is separated from the heat dissipation hole 4, namely, the pressure difference is larger than the predetermined pressure difference. Because of being lasting high-speed high temperature in protection chamber 2 promptly, and lead to inside gas expansion, pressure crescent, reach the predetermined pressure difference promptly, casing 1 is under this predetermined pressure difference this moment, still can not appear breaking, and heated expansion stopper 8 is under the effect of pressure difference, remove to outside low pressure department, louvre 4 forms pressure release ventilation channel this moment until breaking away from louvre 4, in order can be fast to carrying out the pressure release to the inside high-pressure gas in protection chamber 2, and then avoid 1 inside further steps up of casing effectively, and then avoid the pressure difference too big and lead to the explosion. In order to avoid that the internal and external pressure difference does not reach the predetermined pressure difference, the thermal expansion plug 8 is separated from the heat dissipation hole 4, or the internal and external pressure difference cannot be separated from the heat dissipation hole 4 when the internal and external pressure difference reaches the predetermined pressure difference, therefore, the connecting force between the thermal expansion plug 8 and the hole wall of the heat dissipation hole 4 should be adjusted to ensure that the thermal expansion plug starts to be separated from the heat dissipation hole 4 and the heat dissipation hole 4 can be.
In this cable joint protection box, in the application, when cable joint normally worked, this moment, cable joint's normal intensification, and when leading to protection chamber 2 to heat up, heated expansion stopper 8 was in unexpanded state or did not expand to sealing ventilation hole 5 this moment, just dispels the heat through ventilation hole 5. And rise gradually along with inside temperature to when reaching harm peripheral environment, the expansion plug 8 that is heated this moment, because high temperature is heated, lead to the inflation, so that ventilation hole 5 closes with sealed louvre 4, with the inside and outside gas exchange of prevention, and then avoid inside intensity of a fire or high-temperature gas to transmit to the 1 outside environment of casing, thereby prevent the intensity of a fire to distribute, and avoid catching a fire. And when the cable joint rises temperature fast to cause inside atmospheric pressure to rise fast, and approach the explosion pressure difference, the pressure difference can push away heated expansion plug 8 this moment, and louvre 4 ventilates completely this moment, with the pressure release to protection cavity 2 fast, avoids the explosion. So this cable joint protection box is through setting up louvre 4 to set up thermal expansion stopper 8 in louvre 4, with in inside high temperature, seal when producing the intensity of a fire promptly, prevent the intensity of a fire effectively to stretch, and when inside temperature sharply risees and leads to atmospheric pressure to rise, can bounce open under the high pressure, prevent 1 explosion of casing through the pressure release, and then improve life effectively, play better fire prevention ventilation effect. The cable joint protection box can effectively solve the problems that the existing cable joint protection box is poor in fireproof and ventilation effects and easy to explode.
Wherein thermal expansion stopper 8 can be fixed in louvre 4 through the bloated tight, but considering that thermal expansion stopper 8 itself still can appear thermal expansion, so lead to the later stage to expand too big easily, and lead to the tension force too big, can't break away from louvre 4, based on this, this is preferred wherein thermal expansion stopper 8 seals the adhesion along circumference through the pore wall of no silica gel and louvre 4, and when the pressure differential was too big, when reaching above-mentioned predetermined pressure differential promptly, the adhesion between thermal expansion stopper 8 and louvre 4 pore wall breaks away from for thermal expansion stopper 8 can break away from louvre 4. Wherein louvre 4 can circular port, quad slit or slotted hole, generally sets up the upside in protection chamber 2. A plurality of heat dissipation holes 4 may be provided, and heat expansion plugs 8 are respectively provided, and the heat dissipation holes 4 are generally provided at the end of the housing 1 along the cable extending direction.
Furthermore, in order to avoid the situation that the humidity inside the housing 1 is too high due to the arrangement of the vent holes 5, a fire or heat generation and temperature rise inside the protection cavity 2 are more easily caused. For this purpose, the bottom of the protective chamber 2 is preferably provided with a layer 6 of a fireproof moisture-absorbing material. Specifically, the fireproof moisture absorbing material layer 6 is preferably a mixture layer containing calcium oxide, calcium carbonate, and aluminum hydroxide powder. When moisture exists in the interior, the calcium oxide absorbs moisture to form calcium hydroxide, and the calcium hydroxide absorbs heat to decompose at 350-600 ℃ so as to play a role in reducing the temperature. And the aluminum hydroxide begins to decompose and absorb heat at about 250 ℃, and both release a large amount of water vapor to play a role in cooling. And the calcium carbonate is decomposed at 800-900 ℃, and carbon dioxide and calcium oxide are decomposed by heat absorption, so that the mixture layer can play a good role in inhibiting fire.
Further, in order to ensure the anti-explosion capability, the housing 1 is preferably a glass fiber reinforced plastic housing, which has the advantages of light weight, strong anti-explosion capability and the like, and preferably adopts a pressure difference capable of resisting 4.5MPa (megapascal). The preferred casing 1 here includes upper casing and inferior valve, and wherein upper casing and inferior valve are the glass steel material of 10 millimeters thick, and upper casing and inferior valve adopt the fastening screw fixed connection, and upper casing and inferior valve form the ear limit on both sides promptly to carry out screwed connection through the ear limit.
Further, in order to achieve a better fireproof effect, the upper cavity wall of the protection cavity 2 is preferably adhered with a fireproof heat absorption blanket 7 through a bonding agent, so that when the heated temperature reaches a second preset temperature, the bonding agent fails, the fireproof heat absorption blanket 7 falls to cover the cable connector, the fire of the cable connector is prevented from spreading outwards, and the fireproof effect can be achieved well. It should be noted that the fire-proof heat-absorbing blanket 7 is preferably arranged right above the cable joint, so as to ensure that the fire-proof heat-absorbing blanket 7 can be well covered on the cable joint when falling. Specifically, the binder is preferably an organic glue.
Correspondingly, the outer side of the casing 1 may be wrapped with a layer of the fire blanket to effectively organize the fire to spread outwards through the outer fire blanket, and it should be noted that the outer fire blanket should not interfere with the heat dissipation holes 4 to dissipate heat, and should be provided with corresponding heat dissipation holes.
Further, for the inside condition of prediction in advance that can be better, it is preferable here still including being used for measuring the humiture sensor of temperature and humidity in the protection chamber 2, it is specific can set up humiture sensor in protection chamber 2 to through wire or wireless mode, transmit the humiture signal that humiture sensor acquireed to the monitoring station of rear side, in order to make things convenient for the monitoring station to monitor the humiture in the protection chamber 2, so that when the appearance is unusual, can in time perceive.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a cable joint protection box, includes the casing, the casing has the protection chamber that is used for protecting cable joint including inside, the protection chamber has the penetration mouth that link up inside and outside in order to be used for the cable to penetrate, a serial communication port, be provided with on the casing and link up extremely from the outside protection intracavity's louvre, the louvre internal fixation has the thermal expansion stopper, be provided with the ventilation hole that link up inside and outside on the thermal expansion stopper, when the ambient temperature reaches first predetermined temperature value, can expand to sealing the ventilation hole, in order to seal when internal pressure increases to the internal and external pressure difference and reaches predetermined pressure difference, the thermal expansion stopper can break away from along the pressure difference direction the louvre before the casing breaks.
2. The cable splice protection enclosure of claim 1, wherein the heat expandable plug is sealingly bonded circumferentially to the walls of the heat dissipation aperture by a silicone-free gel.
3. The cable splice protection enclosure of claim 1, wherein a fire-resistant moisture-absorbing material layer is disposed on a bottom of the protection cavity.
4. The cable splice protection box of claim 3, wherein said layer of fire and moisture absorbent material is a layer of a mixture comprising calcium oxide, calcium carbonate, and aluminum hydroxide powder.
5. The cable splice protection enclosure of claim 1, wherein the housing is a fiberglass housing.
6. The cable splice protection enclosure of any one of claims 1-5, wherein the upper chamber wall of the protection chamber is affixed with a fire-resistant heat-absorbing blanket by a bonding agent such that when the heated temperature reaches the second predetermined temperature, the bonding agent fails to allow the fire-resistant heat-absorbing blanket to fall over the cable splice.
7. The cable splice protection enclosure of claim 6, wherein the exterior of said housing is wrapped with a layer of said fire-blocking blanket.
8. The cable splice protection enclosure of claim 6, further comprising a temperature and humidity sensor for measuring temperature and humidity within the protection cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010878571.0A CN112018714A (en) | 2020-08-27 | 2020-08-27 | Cable joint protection box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010878571.0A CN112018714A (en) | 2020-08-27 | 2020-08-27 | Cable joint protection box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112018714A true CN112018714A (en) | 2020-12-01 |
Family
ID=73503778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010878571.0A Pending CN112018714A (en) | 2020-08-27 | 2020-08-27 | Cable joint protection box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112018714A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2608637A (en) * | 2021-07-08 | 2023-01-11 | Viridian Solar Ltd | Fire enclosure |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201733055U (en) * | 2009-09-04 | 2011-02-02 | 邵珠合 | Cable joint explosion-proof box |
| CN202309010U (en) * | 2011-08-25 | 2012-07-04 | 3M中国有限公司 | Fireproof protection box for protecting intermediate joint of cable |
| CN203954498U (en) * | 2014-04-25 | 2014-11-26 | 深圳市谱尼测试科技有限公司 | A kind of high-low temperature chamber automatic fire extinguisher |
| CN205657411U (en) * | 2016-05-04 | 2016-10-19 | 北京永安世联工程技术有限公司 | Cable intermediate head protects box |
| CN106099829A (en) * | 2016-08-18 | 2016-11-09 | 上海市政工程设计研究总院（集团）有限公司 | A kind of wet environment cable connector fireproof protection box |
| CN106129926A (en) * | 2016-08-18 | 2016-11-16 | 上海市政工程设计研究总院（集团）有限公司 | A kind of non-wet environment cable connector fireproof protection box |
| CN206442098U (en) * | 2016-11-30 | 2017-08-25 | 广东安诺新材料科技有限公司 | A kind of totally enclosed type cable connector waterproof fireproofing anti-explosion safety box |
| CN111265800A (en) * | 2020-04-01 | 2020-06-12 | 上海联捷消防科技有限公司 | Novel fire blanket capable of automatically extinguishing fire |
-
2020
- 2020-08-27 CN CN202010878571.0A patent/CN112018714A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201733055U (en) * | 2009-09-04 | 2011-02-02 | 邵珠合 | Cable joint explosion-proof box |
| CN202309010U (en) * | 2011-08-25 | 2012-07-04 | 3M中国有限公司 | Fireproof protection box for protecting intermediate joint of cable |
| CN203954498U (en) * | 2014-04-25 | 2014-11-26 | 深圳市谱尼测试科技有限公司 | A kind of high-low temperature chamber automatic fire extinguisher |
| CN205657411U (en) * | 2016-05-04 | 2016-10-19 | 北京永安世联工程技术有限公司 | Cable intermediate head protects box |
| CN106099829A (en) * | 2016-08-18 | 2016-11-09 | 上海市政工程设计研究总院（集团）有限公司 | A kind of wet environment cable connector fireproof protection box |
| CN106129926A (en) * | 2016-08-18 | 2016-11-16 | 上海市政工程设计研究总院（集团）有限公司 | A kind of non-wet environment cable connector fireproof protection box |
| CN206442098U (en) * | 2016-11-30 | 2017-08-25 | 广东安诺新材料科技有限公司 | A kind of totally enclosed type cable connector waterproof fireproofing anti-explosion safety box |
| CN111265800A (en) * | 2020-04-01 | 2020-06-12 | 上海联捷消防科技有限公司 | Novel fire blanket capable of automatically extinguishing fire |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2608637A (en) * | 2021-07-08 | 2023-01-11 | Viridian Solar Ltd | Fire enclosure |
| WO2023281066A1 (en) * | 2021-07-08 | 2023-01-12 | Viridian Solar Limited | Fire enclosure |
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Application publication date: 20201201 |