CN212057223U - Light shows controlgear and electric boiler system - Google Patents
Light shows controlgear and electric boiler system Download PDFInfo
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- CN212057223U CN212057223U CN202020707920.8U CN202020707920U CN212057223U CN 212057223 U CN212057223 U CN 212057223U CN 202020707920 U CN202020707920 U CN 202020707920U CN 212057223 U CN212057223 U CN 212057223U
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Abstract
The utility model provides an optical display control device and an electric boiler system, wherein, the optical display control device comprises an electric energy input port, a data acquisition port, a controller connected with the electric energy input port and the data acquisition port, a driver connected with the controller and a light indicator connected with the driver; the controller starts the light display control equipment to work under the electric energy provided by the electric energy input port, and sends a light color indicating signal corresponding to the electric signal to the driver after receiving the electric signal collected by the data collecting port so as to trigger the light indicator to display the light color corresponding to the light color indicating signal. The utility model discloses make the user in time know the inside temperature of electric boiler according to light colour, and then be convenient for carry out the temperature control of electric boiler to reduce the extravagant requirement that reaches energy saving and emission reduction of the energy.
Description
Technical Field
The utility model belongs to the technical field of electric boiler technique and specifically relates to a light shows controlgear and electric boiler system is related to.
Background
The industrial electric boiler is widely used as large-scale heating equipment, and at present, the electric boiler basically adopts a resistance-type tubular electric heating element heating type electric boiler, can fully utilize off-peak electricity to store and store energy, cut peaks and fill valleys, save electric energy and reduce the emission of harmful gases in cities, is an objective requirement for the development of times and is a necessary trend for the development in the future.
However, such an electric boiler is usually in a closed shell form, and generally, the temperature in the boiler can only be estimated by experience or by measuring the external temperature, so that a user cannot know the temperature state in the boiler in time, and further, the temperature control is not convenient, so that the energy waste is reduced, and the requirements of energy conservation and emission reduction are met.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a light display control device and an electric boiler system, so as to alleviate the above technical problems.
In a first aspect, an embodiment of the present invention provides an optical display control device, wherein the optical display control device includes: the system comprises an electric energy input port, a data acquisition port, a controller, a driver and a light indicator, wherein the controller is connected with the electric energy input port and the data acquisition port; the electric energy input port is used for being connected with an external power supply and supplying electric energy to the light display control equipment; the controller starts the light display control equipment to work under the electric energy provided by the electric energy input port; the data acquisition port is used for connecting a signal output end of the electric boiler and acquiring an electric signal output by the signal output end; the signal output end is used for outputting an electric signal of the temperature collected by the temperature collector in the electric boiler; the controller is also used for receiving the electric signals collected by the data collecting port and outputting light color indicating signals corresponding to the electric signals; the driver is used for receiving the light color indication signal and triggering the light indicator to display the light color corresponding to the light color indication signal.
In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the light indicator is composed of a plurality of light beads; a plurality of lamp beads form a plurality of lamp groups, and the lamp beads of each lamp group are different in light-emitting color.
With reference to the first possible implementation manner of the first aspect, embodiments of the present invention provide a second possible implementation manner of the first aspect, wherein the driver includes a plurality of driving units; each driving unit is connected with one lamp group and used for receiving the light color indicating signal to trigger the lamp beads in the lamp group to be lightened.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the driving unit includes a triode, a current-limiting resistor, and a protection resistor; the collector of the triode is connected with the lamp bank, the first end of the current-limiting resistor and the first end of the protective resistor are both connected with the base of the triode, the second end of the current-limiting resistor is connected with the controller, and the emitter of the triode and the second end of the protective resistor are both grounded.
With reference to the third possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the light display control device further includes a fault indicator light and a plurality of detectors, which are connected to the controller, and each detector is connected to one light group; the controller is also used for outputting a driving electric signal to trigger the fault indicator lamp to light when receiving the detection electric signal sent by the detector.
With reference to the fourth possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the detector includes a first resistor and a second resistor; the first end of the first resistor is connected with the collector of the triode, the second end of the first resistor and the first end of the second resistor are both connected with the controller, and the second end of the second resistor is grounded.
In combination with the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the light display control device further includes an interaction panel connected to the controller, and the interaction panel is provided with a display unit and a setting control; the display unit is used for displaying signals sent or received by the controller; the setting control is used for setting the parameters of the controller.
With reference to the sixth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the optical display control device further includes a communication port connected to the controller; the communication port is used for connecting an external terminal and transmitting signals transmitted or received by the controller to the external terminal.
In a second aspect, an embodiment of the present invention further provides an electric boiler system, wherein the electric boiler system includes an electric boiler and further includes the above-mentioned light display control device; wherein, a temperature collector is arranged in the furnace chamber of the electric boiler.
In combination with the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, wherein the electric boiler system further includes an external terminal for displaying a signal sent or received by the controller in the optical display control device.
The embodiment of the utility model provides a following beneficial effect has been brought:
the embodiment of the utility model provides a light shows controlgear and electric boiler system, wherein, this light shows controlgear including electric energy input port and data acquisition port, with electric energy input port and data acquisition port all be connected the controller to and the driver of being connected with the controller and the light indicator of being connected with the driver; the controller starts the light display control equipment to work under the electric energy provided by the electric energy input port, and sends a light color indicating signal corresponding to the electric signal to the driver after receiving the electric signal acquired by the data acquisition port so as to trigger the light indicator to display the light color corresponding to the light color indicating signal; the user can know the internal temperature of the electric boiler in time according to the light color, and then temperature control is convenient to carry out, so that the energy waste is reduced, and the requirements of energy conservation and emission reduction are met.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a light display control device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another light display control device according to an embodiment of the present invention;
fig. 3 is a schematic circuit structure diagram of a light display control device according to an embodiment of the present invention;
fig. 4 is an electric boiler system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another electric boiler system according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
An industrial electric boiler, also called electric heating boiler or electric heating boiler, is a boiler device which takes electric power as energy and converts the electric power into heat energy, thereby outputting steam, high-temperature water or organic heat carrier with certain heat energy through boiler conversion.
The heating mode of the existing industrial electric boiler mainly comprises an electromagnetic induction heating mode and a resistance (electric heating pipe) heating mode, and the resistance heating mode adopts a resistance tubular electric heating element for heating, so that the electric boiler is easy to superpose and combine structurally, flexible to control and convenient to maintain and replace, and therefore the existing industrial electric boiler basically adopts a resistance tubular electric heating element heating type electric boiler to provide heat energy for industrial production or life of people. In order to solve the electric boiler confined shell form of current resistance heating mode, can't make the user in time know the problem of stove temperature state, the embodiment of the utility model provides a pair of light shows controlgear and electric boiler system can alleviate above-mentioned technical problem.
For the convenience of understanding the present embodiment, a light display control device disclosed in the embodiments of the present invention will be described in detail first.
The first embodiment is as follows:
the embodiment of the utility model provides a light shows controlgear, as shown in FIG. 1 a light shows controlgear's schematic structure diagram, as shown in FIG. 1, this light shows controlgear includes: the system comprises a power input port 100 and a data acquisition port 101, a controller 102 connected with the power input port 100 and the data acquisition port 101, a driver 103 connected with the controller 102 and a light indicator 104 connected with the driver 103; the electric energy input port 100 is used for connecting with an external power supply and providing electric energy for the optical display control equipment; the controller 102 starts the light display control device to work under the power supplied by the power input port 100; the data acquisition port 101 is used for connecting a signal output end of the electric boiler and acquiring an electric signal output by the signal output end; the signal output end is used for outputting an electric signal of the temperature collected by the temperature collector in the electric boiler; the controller 102 is further configured to receive an electrical signal collected by the data collection port 101, and output a light color indication signal corresponding to the electrical signal; the driver is used for receiving the light color indication signal and triggering the light indicator to display the light color corresponding to the light color indication signal.
The embodiment of the utility model provides an optical display control device, wherein, this optical display control device includes electric energy input port and data acquisition port, the controller that is connected with electric energy input port and data acquisition port all, and the driver that is connected with the controller and the light indicator that is connected with the driver; the controller starts the light display control equipment to work under the electric energy provided by the electric energy input port, and sends a light color indicating signal corresponding to the electric signal to the driver after receiving the electric signal acquired by the data acquisition port so as to trigger the light indicator to display the light color corresponding to the light color indicating signal; the user can know the internal temperature of the electric boiler in time according to the light color, and then temperature control is convenient to carry out, so that the energy waste is reduced, and the requirements of energy conservation and emission reduction are met.
Generally, because the internal temperature of an electric boiler is high, a flat cable made of a high-temperature resistant material is required to connect the data acquisition port 101 with a signal output end of the electric boiler so as to realize transmission of an electric signal; the electric signal output by the signal output end is the electric signal of the temperature collected by the temperature collector arranged in the furnace cavity of the electric boiler, and the temperature can be collected by the thermocouple temperature sensor in the embodiment in order to accurately collect the temperature in the furnace cavity. Among them, the thermocouple sensor belongs to one of self-generating sensors, and is widely used for measuring the surface temperature of gas and solid in boilers and pipelines because the thermocouple sensor does not need an external power supply for supplying power and is convenient to use when the thermocouple sensor is used for measurement.
The light indicator 104 is composed of a plurality of lamp beads; a plurality of lamp beads form a plurality of lamp groups, and the lamp beads of each lamp group are different in light-emitting color. For convenience of description, the light indicator is composed of 9 light beads, each 3 light beads form a light group, and the light emitting colors of the light beads in the 3 light groups are red, green and blue, respectively.
In order to drive the light beads in the 3 light groups to be turned on, a driver is required to be provided with a plurality of driving units; for easy understanding, fig. 2 shows a schematic structural diagram of another light display control device, and as shown in fig. 2, since the number of the lamp groups 200 is 3, the number of the driving units 201 arranged in the driver 103 is also 3, and each driving unit 201 is connected to one lamp group 200 for receiving the light color indication signal to trigger the lighting of the lamp beads in the lamp group.
The lighting color indicating signal is a duty ratio signal for driving the lamp beads to be lightened, when the lighting color indicating signal is actually used, a duty ratio signal table is stored in the controller in advance, a plurality of specific electric signals and duty ratio signals of each lamp group in one-to-one correspondence with the specific electric signals are stored in the duty ratio signal table; for example, the electric signal of the temperature currently output by the signal output end received by the controller is 5V, and it can be known from the table that a lamp group with a red light emitting color corresponds to a 50% duty cycle signal, a lamp group with a green light emitting color corresponds to a 30% duty cycle signal, and a lamp group with a blue light emitting color corresponds to a 70% duty cycle signal, and then the controller can send the duty cycle signal corresponding to each lamp group to the correspondingly connected driving unit to drive the lamp beads in the corresponding lamp group to be turned on.
Because the electrical signals of the current temperature output by the signal output end are different, the duty ratio signals corresponding to the three lamp groups are different, so that the lighting time of the lamp beads in the three lamp groups is different, and therefore, different color transformation can be brought to people visually, so that a user can know the internal temperature of the electric boiler in time according to the light color, for example, when the temperature of the electric boiler is 1000-700 ℃, the corresponding light color is red, when the temperature of the electric boiler is 699-400 ℃, the corresponding light color is orange, when the temperature of the electric boiler is 399-60 ℃, the corresponding light color is yellow, and when the temperature of the electric boiler is 59-10 ℃, the corresponding light color is blue.
Generally, the controller is usually a Central Processing Unit (CPU) of the entire optical display control device, and may be configured with a corresponding operating system and a control interface, and specifically, may be a Digital logic controller that can be used for automation control, such as a single chip, a DSP (Digital Signal Processing), an ARM (Advanced RISC machine, ARM processor), and the like, and may load a control instruction to a memory at any time for storage and execution, and meanwhile, may have a built-in Unit such as a CPU instruction and a data memory, an input/output Unit, a power module, and a Digital analog Unit, and may be specifically set according to an actual use situation, which is not limited in this embodiment.
Fig. 3 is a schematic circuit diagram of a light display control device, which is illustrated in fig. 3 by taking a lamp set and a driving unit as an example, wherein the driving unit includes a transistor Q1, a current limiting resistor R1 and a protection resistor R2; the collector of the triode Q1 is connected to the lamp set 200, the first end of the current-limiting resistor R1 and the first end of the protection resistor R2 are both connected to the base of the triode Q1, the second end of the current-limiting resistor R1 is connected to the controller 102, and the emitter of the triode Q1 and the second end of the protection resistor R2 are both grounded.
Preferably, the resistance of the current limiting resistor R1 can be 10 kilo ohms, the resistance of the protection resistor R2 can be 563 ohms, the collector of the triode Q1 is connected with the negative electrode of the lamp bead in the lamp bank 200, the positive electrode of the lamp bead is connected with the power supply, and when the controller sends the light color indication signal to the driving unit, the lamp bead in the lamp bank 200 is turned on due to conduction of the triode Q1.
It should be noted that the circuit structure shown in fig. 3 is only one implementation manner for implementing voltage conversion in this embodiment, and a user may also convert the NPN transistor Q1 into a PNP transistor according to needs, which is not illustrated here, and the resistances of the current limiting resistor R1 and the protection resistor R2 may be set according to actual needs, which is not limited here.
In order to be able to detect the lamp sets, as shown in fig. 2, the light display control device further includes a fault indicator lamp 202 connected to the controller 102 and a plurality of detectors 203, one for each detector 203; the controller 102 is further configured to output a driving electrical signal to trigger the fault indicator lamp 202 to light when receiving the detection electrical signal sent by the detector 203.
In fig. 3, a detector is illustrated as an example, and the detector 203 includes a first resistor R3 and a second resistor R4; the first end of the first resistor R3 is connected to the collector of the transistor Q1, the second end of the first resistor R3 and the first end of the second resistor R4 are both connected to the controller 102, and the second end of the second resistor R4 is grounded.
The plurality of lamp beads in each lamp group are connected in series, when the controller 102 sends the light color indication signal to the driving unit 201 to drive the lamp beads in the lamp group to be turned on, if any lamp bead in the lamp group is damaged, the controller receives a low-level detection electric signal, and then the controller outputs the driving electric signal to trigger the fault indicator lamp 202 to be turned on, so as to prompt a user to replace the light indicator.
When the plurality of lamp beads in each lamp group are connected in parallel, when the controller 102 sends the light color indication signal to the driving unit 201 to drive the lamp beads in the lamp group to light up, if all the lamp beads in the lamp group are damaged, the controller will receive the low-level detection electrical signal, and then the controller outputs the driving electrical signal to trigger the fault indicator lamp 202 to light up, and prompts the user to replace the light indicator.
As shown in fig. 3, the resistance of the first resistor R3 is 100 kohm, and the resistance of the second resistor R4 is 10 kohm, and in actual use, the resistances of the first resistor R3 and the second resistor R4 may be set according to actual needs, which is not limited herein.
In order to facilitate the user to know the temperature condition in the electric boiler in detail, as shown in fig. 2, the light display control device further includes an interactive panel 204 connected with the controller 102, the interactive panel 204 is provided with a display unit 205 and a setting control 206; the display unit 205 is used for displaying signals sent or received by the controller; the setting control 206 is used to set the parameters of the controller.
Generally, in order to facilitate the user to operate and check the temperature in the furnace, the interactive panel may be installed on any side of the Light display control device, and the Light indicator and the fault indicator are also installed on the side where the interactive panel is installed, the display unit 205 on the interactive panel may be implemented by using an LED (Light-Emitting Diode) for the display screen, and may display the temperature electrical signal acquired by the temperature acquisition device on the display screen in a digital or text manner, in this embodiment, the temperature may be displayed on the display screen in a percentage manner, for example, when the temperature is 1000 degrees celsius, the corresponding percentage is 100%, and the current temperature condition of the electric boiler may be accurately known by scaling down the percentage; the display mode of the display screen can be flexibly selected according to the requirement.
In specific implementation, a user may set parameters of the controller through the setting control, for example, the setting control may set a corresponding relationship between a specific electrical signal and a duty ratio signal corresponding to each lamp group in a duty ratio signal table stored in the controller. Besides the above functions, the interactive panel can display other information, such as company trademark and controller power-on information, as required.
As shown in fig. 2, the light display control device further includes a communication port 207 connected to the controller 102; the communication port 207 is used for connecting an external terminal and transmitting a signal transmitted or received by the controller to the external terminal.
In order to enable a manufacturer or a user to know the condition of the electric boiler in time, generally, the controller 102 of the optical display control device can communicate with an external terminal of the manufacturer or the user through the communication port 207, the external terminal can be an intelligent mobile phone, a tablet personal computer and other intelligent terminals capable of being networked, an application program APP matched with the controller can be installed on the external terminal in advance, the user can check a received or sent signal uploaded by the controller through logging in the application program APP, and therefore the manufacturer and the user can conveniently know the temperature condition of the current electric boiler and the working condition of the light indicator.
The light display control equipment can start the light display control equipment to work under the condition that the controller normally operates, and sends a light color indicating signal corresponding to the electric signal to the driver after receiving the electric signal collected by the data collecting port so as to trigger the light indicator to display the light color corresponding to the light color indicating signal; the user can know the internal temperature of the electric boiler in time according to the light color, and then temperature control is convenient to carry out, so that the energy waste is reduced, and the requirements of energy conservation and emission reduction are met.
Example two:
the embodiment of the present invention further provides an electric boiler system, such as the schematic structural diagram of the electric boiler system shown in fig. 4, and as shown in fig. 4, the electric boiler system 400 includes an electric boiler 401, and further includes the above-mentioned light display control device 402; wherein, a temperature collector 403 is installed in the furnace chamber of the electric boiler.
On the basis of fig. 4, fig. 5 shows a schematic structural diagram of another electric boiler system, as shown in fig. 5, the electric boiler system further includes an external terminal 500 for displaying signals sent or received by the controller 102 in the light display control device.
The embodiment of the utility model provides an electric boiler system, the light that provides with above-mentioned embodiment shows controlgear and has the same technical characteristic, so also can solve the same technical problem, reach the same technological effect.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing embodiment of the light display control device, and is not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A light display control apparatus characterized by comprising: the system comprises an electric energy input port, a data acquisition port, a controller, a driver and a light indicator, wherein the controller is connected with the electric energy input port and the data acquisition port;
the electric energy input port is used for being connected with an external power supply and supplying electric energy to the optical display control equipment;
the controller starts the light display control equipment to work under the electric energy provided by the electric energy input port;
the data acquisition port is used for connecting a signal output end of the electric boiler and acquiring an electric signal output by the signal output end; the signal output end is used for outputting an electric signal of the temperature collected by the temperature collector in the electric boiler;
the controller is also used for receiving the electric signals collected by the data collecting port and outputting light color indicating signals corresponding to the electric signals;
the driver is used for receiving the light color indication signal and triggering the light indicator to display the light color corresponding to the light color indication signal.
2. The light display control apparatus of claim 1 wherein the light indicator is comprised of a plurality of light beads;
the lamp beads form a plurality of lamp groups, and the light emitting color of the lamp beads of each lamp group is different.
3. The light display control apparatus of claim 2, wherein the driver comprises a plurality of driving units;
each driving unit is connected with one lamp group and used for receiving the light color indicating signal to trigger the lamp beads in the lamp group to be lightened.
4. The light display control device according to claim 3, wherein the driving unit includes a transistor, a current limiting resistor, and a protection resistor;
the collector of the triode is connected with the lamp bank, the first end of the current-limiting resistor and the first end of the protective resistor are both connected with the base of the triode, the second end of the current-limiting resistor is connected with the controller, and the emitter of the triode and the second end of the protective resistor are both grounded.
5. The light display control device according to claim 4, further comprising a fault indicator light and a plurality of detectors connected to the controller, each of the detectors being connected to one of the light sets;
the controller is also used for outputting a driving electric signal to trigger the fault indicator lamp to be lightened when receiving the detection electric signal sent by the detector.
6. The light display control apparatus of claim 5, wherein the detector comprises a first resistor and a second resistor;
the first end of the first resistor is connected with the collector of the triode, the second end of the first resistor and the first end of the second resistor are both connected with the controller, and the second end of the second resistor is grounded.
7. The light display control device according to claim 1, further comprising an interactive panel connected to the controller, the interactive panel being provided with a display unit and a setting control;
the display unit is used for displaying the signals sent or received by the controller;
the setting control is used for setting the parameters of the controller.
8. The light display control device of claim 7, further comprising a communication port connected to the controller;
the communication port is used for connecting an external terminal and sending signals sent or received by the controller to the external terminal.
9. An electric boiler system, characterized in that the electric boiler system comprises an electric boiler, further comprising a light display control device according to any one of claims 1-8;
wherein, a temperature collector is arranged in the furnace chamber of the electric boiler.
10. The electric boiler system according to claim 9, further comprising an external terminal for displaying the signal transmitted or received by the controller in the light display control device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020707920.8U CN212057223U (en) | 2020-04-30 | 2020-04-30 | Light shows controlgear and electric boiler system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020707920.8U CN212057223U (en) | 2020-04-30 | 2020-04-30 | Light shows controlgear and electric boiler system |
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| CN212057223U true CN212057223U (en) | 2020-12-01 |
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