CN208547420U - A kind of Direct Air-Cooled temperature field on-Line Monitor Device - Google Patents
A kind of Direct Air-Cooled temperature field on-Line Monitor Device Download PDFInfo
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- CN208547420U CN208547420U CN201821163254.5U CN201821163254U CN208547420U CN 208547420 U CN208547420 U CN 208547420U CN 201821163254 U CN201821163254 U CN 201821163254U CN 208547420 U CN208547420 U CN 208547420U
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Abstract
The utility model discloses a kind of Direct Air-Cooled temperature field on-Line Monitor Devices, it include: several cable for measuring temperature A, it is arranged in aerial condenser lateral surface at regular intervals, and is located at the outer surface for the immediate system radiator tube bank being connected with direct air cooling system steam-distributing pipe；Cable for measuring temperature B, the direct air cooling system fan outlet being arranged on the inside of aerial condenser；Several temperature transducers are arranged at regular intervals on several cable for measuring temperature A and cable for measuring temperature B；Collector is connect with several cable for measuring temperature A and the cable for measuring temperature B；Host is monitored, is connect with the collector.The utility model has the following beneficial effects:, using bussing technique, construction includes the integrated temperature field on-Line Monitor Device of multiple temperature points using digital intelligent temperature sensor, realizes multiple spot large area temperature monitoring, be conducive to the antifreeze work of direct air cooling system.
Description
Technical field
The utility model relates to thermal power plant's Direct Air-Cooling Technology fields, in particular to a kind of Direct Air-Cooled temperature field
On-Line Monitor Device.
Background technique
Direct air cooling system is that the steam discharge of steam turbine is sent to the air cooling tubes condenser of outdoor arrangement by coarse blow-off line
Interior, axis stream cooling blower makes air flow through the outer surface of radiator, steam discharge is cooled to water, condensed water pumps back-steam through condensation again
The heat regenerative system of turbine.The advantages of direct air cooling system is that equipment is few, and system is simple, and capital expenditure is few, and land occupation is few, air capacity tune
Section is flexible.The disadvantage is that coarse blow-off line seals difficult when operation, maintain the vacuum in gland steam exhauster difficult, when starting vacuumizes
The time needed is long.It when winter environment temperature is lower than 0 DEG C, is easy to freeze, freezing tube bank causes to leak, and influences the safety of unit
Property and economy.It is that unit runs a critically important job that direct air cooling system is antifreeze, at present using covering, manual inspection,
Improve the modes such as back pressure, manual inspection heavy workload, not only labor intensive, financial resources, and real-time is poor, affects unit effect
Benefit.Common temp measuring method has thermocouple and thermal resistance in industry, due to the complicated sexual incompatibility direct air cooling system of its installation
Multipoint temperature monitoring.
Utility model content
To solve the above problems, the purpose of this utility model is to provide a kind of Direct Air-Cooled temperature field on-line monitorings to fill
It sets, using digital intelligent temperature sensor, using bussing technique, construction exists comprising the integrated temperature field of multiple temperature points
Line monitoring device realizes multiple spot large area temperature monitoring, is conducive to the antifreeze work of direct air cooling system.
The utility model provides a kind of Direct Air-Cooled temperature field on-Line Monitor Device, comprising:
Several cable for measuring temperature A, are arranged in aerial condenser lateral surface at regular intervals, and are located at and direct air cooling system
The outer surface of the connected immediate system radiator tube bank of steam-distributing pipe；
Cable for measuring temperature B, the direct air cooling system fan outlet being arranged on the inside of aerial condenser；
Several temperature transducers are arranged at regular intervals on several cable for measuring temperature A and cable for measuring temperature B；
Collector is connect with several cable for measuring temperature A and the cable for measuring temperature B；
Host is monitored, is connect with the collector.
It is further improved as the utility model, the tube bank of immediate system radiator is by multiple fair current unit pipe bundles and multiple
Counter flow cell tube bank composition, multiple fair current unit pipe bundles form fair current area, and multiple counter flow cells restrain to form countercurrent zone, adjacent
Fair current unit pipe bundles and counter flow cell restrain to form concurrent-countercurrent junctional area；
Several cable for measuring temperature A include at least one the first cable for measuring temperature and at least one the second thermometrics of parallel arrangement
Cable；
Several temperature transducers on first cable for measuring temperature are arranged on the temperature point of countercurrent zone, second thermometric
Several temperature transducers on cable are arranged in fair current area temperature point, concurrent-countercurrent junctional area temperature point and countercurrent zone temperature and survey
Point on.
It is further improved as the utility model, first cable for measuring temperature is located at the upper of second cable for measuring temperature
Side.
It is further improved as the utility model, several cable for measuring temperature A include first first of parallel arrangement
Cable for measuring temperature, the first cable for measuring temperature of Article 2, first the second cable for measuring temperature and the second cable for measuring temperature of Article 2.
It is further improved as the utility model, several temperature transducers are encapsulated in several cable for measuring temperature
Inside the A and cable for measuring temperature B.
It is further improved as the utility model, several temperature transducers pass through CAN converter and the acquisition
Device connection, the collector are connect by CAN converter with the monitoring host.
It is further improved as the utility model, the collector includes microprocessor and connects with the microprocessor
Connect power module, telecommunication circuit, crystal oscillating circuit, display circuit, multiplex temperature collection circuit, reset circuit, warning circuit, temperature
Setting button circuit and CAN bus circuit.
It further being improved as the utility model, several temperature transducers are monobus type temperature sensor,
And it is connect with the microprocessor.
The utility model has the following beneficial effects:
1, using digital intelligent temperature sensor, using bussing technique, construction includes the integration of multiple temperature points
Temperature measurement component, temperature transducer utilize thermally sensitive crystal vibration signal, directly obtain temperature data by counting, steady
Qualitative, accuracy is better than traditional infrared temperature measurement apparatus；
2, cable for measuring temperature distribution arrangement, and the temperature characterisitic restrained according to fair current unit pipe bundles and counter flow cell, in fair current
Area, countercurrent zone and concurrent-countercurrent junctional area are respectively arranged temperature transducer, realize multiple spot large area temperature monitoring, region is avoided to leak
It surveys, improves measurement accuracy；
3, the profiling temperatures that outer surface is restrained by monitoring immediate system radiator, judge immediate system radiator pipe
Radiating state inside beam, whether help judges to freeze in heat-exchanging tube bundle, it can be achieved that the antifreeze early warning of air cooling system, in radiator pipe
Beam takes corresponding safeguard procedures before freezing；
4, it by the profiling temperatures of direct air cooling system fan outlet inside the cooling triangle of monitoring A type, helps to judge
The inhomogeneities of air side flow, realizes the operation of the guidance to air cooling unit back pressure, and winter operation can play reduction back pressure
Effect, achieve the purpose that it is energy-saving, avoid unit operation back pressure it is excessively high, cause blower power consumption excessive, influence operational safety；
5, operations staff's inspection workload can be effectively reduced, provides accurate data in real time, intuitively for operations staff,
It for making the judgement of operating condition, and takes appropriate measures in time, improves working environment, reduce labor intensity.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of Direct Air-Cooled temperature field on-Line Monitor Device described in the utility model embodiment；
Fig. 2 is the arrangement schematic diagram of cable for measuring temperature described in the utility model embodiment.
In figure,
1, direct air cooling system steam-distributing pipe；2, immediate system radiator pipe；31, cable for measuring temperature A；32, cable for measuring temperature
B；4, temperature transducer；5, collector；6, direct air cooling system blower；7, host is monitored；81, first the first cable for measuring temperature；
82, the first cable for measuring temperature of Article 2；83, first the second cable for measuring temperature；84, the second cable for measuring temperature of Article 2.
Specific embodiment
Below by specific embodiment and in conjunction with attached drawing, the utility model is further described in detail.
As shown in Figure 1, a kind of Direct Air-Cooled temperature field on-Line Monitor Device described in the utility model embodiment, comprising:
Several cable for measuring temperature A 31, cable for measuring temperature B 32, several thermometrics on several cable for measuring temperature A 31 and cable for measuring temperature B 32
Sensor 4, collector 5 and monitoring host 7.
Several cable for measuring temperature A 31 are arranged in aerial condenser lateral surface at regular intervals, and are located at and direct air cooling system
The outer surface of the connected immediate system radiator tube bank 2 of steam-distributing pipe 1.Cable for measuring temperature B 32 is arranged in aerial condenser
The direct air cooling system blower 6 of side exports.Several temperature transducers 4 are arranged on several cable for measuring temperature A 31 at regular intervals, are surveyed
Several temperature transducers 4 are arranged on warm cable B 32 at regular intervals.Several cable for measuring temperature A 31 and cable for measuring temperature B 32 connect
To collector 5, collector 5 is connect with monitoring host 7.
Immediate system radiator tube bank 2 is made of multiple fair current unit pipe bundles and the tube bank of multiple counter flow cells, multiple fair currents
Unit pipe bundles form fair current area, and multiple counter flow cells restrain to form countercurrent zone, adjacent fair current unit pipe bundles and counter flow cell pipe
Beam forms concurrent-countercurrent junctional area.In order to monitor the outside wall temperature of immediate system radiator tube bank 2, avoid due to interior media temperature
Spend it is low cause the tube bank of immediate system radiator 2 to be freezed, and lead to the direct air cooling system equipment interruption of service, several cable for measuring temperature
A 31 includes at least one the first cable for measuring temperature and at least one the second cable for measuring temperature of parallel arrangement.Wherein, the first thermometric electricity
Several temperature transducers 4 on cable are arranged on the temperature point of countercurrent zone, to monitor the outside wall temperature of counter flow cell tube bank, the
Several temperature transducers 4 on two cable for measuring temperature are arranged in fair current area temperature point, concurrent-countercurrent junctional area temperature point and adverse current
On area's temperature point, to monitor the temperature in fair current area, concurrent-countercurrent junctional area and countercurrent zone, and accurately keeping away for the ease of measurement
Exempt from error, the first cable for measuring temperature and the second cable for measuring temperature are arranged in parallel.
Under normal circumstances, the Temperature Distribution of fair current unit pipe bundles outer wall is that upper relative superiority or inferiority is low, and the temperature of counter flow cell tube bank
It is distributed exactly the opposite, is lower high low；And adverse current is restrained and is easily freezed when running at low ambient temperatures, therefore, temperature
The distribution of measuring point directly affects the temperature field monitoring precision of air cooling tubes condenser.It is restrained according to fair current unit pipe bundles and counter flow cell
Temperature characterisitic, the first cable for measuring temperature is preferably arranged in the top of the second cable for measuring temperature, the monitoring of the first cable for measuring temperature emphasis is inverse
The low-temperature region temperature in area is flowed, the second cable for measuring temperature emphasis monitors low-temperature region temperature, the concurrent-countercurrent junctional area temperature in fair current area,
And combine the high-temperature area temperature of monitoring countercurrent zone.
As shown in Fig. 2, several cable for measuring temperature A 31 include first the first cable for measuring temperature of parallel arrangement in the present embodiment
81,82, first the second cable for measuring temperature 83 of the first cable for measuring temperature of Article 2 and the second cable for measuring temperature of Article 2 84.Certainly it arranges
Item number is not limited to that, during actual arrangement, according to the size and demand of the cooling triangle of A type, can be set more
First cable for measuring temperature and the second cable for measuring temperature.
Wind speed profile inside the cooling triangle of A type is uneven, and the air after air cooling system is heated is returned to air-cooled
System entry is sucked again by direct air cooling system blower 6, and hot backflow phenomenon easily occurs, by several surveys on cable for measuring temperature B32
The direct air cooling system blower 6 that temperature sensor 4 is arranged on the inside of the cooling triangle of A type exports, to monitor direct air cooling system wind
The temperature that machine 6 exports can help the degree for judging to occur heat reflux, adjust direct air cooling system blower 6 in real time according to temperature
Revolving speed, heat reflux influence before make adjusting.Countercurrent zone, fair current area and the concurrent-countercurrent monitored in conjunction with cable for measuring temperature A31
The temperature of junctional area obtains the profiling temperatures of the cooling triangle of entire A type, avoids test leakage region, is immediate system radiator
The antifreeze offer reference frame of tube bank 2, while also foundation can be provided to the back pressure selection of air cooling unit.
Several temperature transducers 4 are encapsulated in inside several cable for measuring temperature A31 and cable for measuring temperature B32, avoid exposed cause
Damage, cause measurement inaccuracy.Temperature transducer 4 in the utility model uses digital intelligent temperature sensor, uses
Bussing technique, the temperature transducer 4 of multiple temperature points, which is integrated in inside cable for measuring temperature, forms integrated temperature measurement component.
For the ease of acquiring while realization to multiple temperature transducer 4, several temperature transducers 4 pass through CAN converter
It is connect with collector 5, at this point, collector 5 is connect by CAN converter with monitoring host 7.What each temperature transducer 4 generated
Temperature data is uploaded to collector 5 by CAN converter and converts CAN message information, then by CAN converter CAN message
Information is converted into the monitoring identifiable position data of 7 serial ports of host, is transmitted on monitoring host 7 by serial ports.
Wherein, collector 5 includes microprocessor and the power module for external power supply connecting with microprocessor, use
In the crystal oscillator electricity for realizing the telecommunication circuit communicated between monitoring host 7, offer 4 the operation is stable frequency of oscillation of temperature transducer
Road, the display circuit for realizing temperature display, the multiplex temperature collection circuit of the temperature acquisition of the multiple temperature transducers 4 of realization, reality
The temperature of reset circuit, warning circuit, realization temperature setting and the inquiry of realizing temperature alarming that existing temperature transducer 4 resets is set
It sets key circuit and realizes the CAN bus circuit that multiple temperature transducers 4 connect.Several temperature transducers 4 are monobus type
Temperature sensor, and connect with microprocessor, integrate temperature measurement and AD conversion, can directly export digital quantity.
In the present embodiment, temperature transducer 4 uses 1-wire digital temperature sensor DS18B20, has the advantage that
(1) single bus interface is used, only needs a port pin can be realized when connecting with microprocessor two-way with microprocessor
Communication, can be serial ports and is also possible to other I/O mouthfuls, directly export measured angle value.Monobus is economical good, anti-interference
The advantages that ability is strong, and the scene temperature for being suitable for adverse circumstances measures, easy to use.(2) measurement temperature range is wide, measurement accuracy
The measurement range of high DS18B20 is -55 DEG C~+125 DEG C；Within the scope of -10~+85 DEG C, precision is ± 0.5 DEG C.(3) make
Any peripheral cell is not needed in.(4) multiple DS18B20 can it is in parallel on a single bus, realize multi-point temperature measurement.(5)
DS18B20 can by endophyte circuit, can directly by data/address bus power, external power supply can not be connect, thus make be
Structure of uniting is simpler, and reliability is higher.(6) Measurement Resolution of DS18B20 can be 9~12 by program setting.(7) it bears
When pressing characteristic electric power polarity reversed, thermometer will not be burnt because of fever, but cisco unity malfunction.It is (8) internal to contain EEPROM,
After system is powered down, it still can be reserved for the setting value of resolution ratio and alarm temperature.
DS18B20 is mainly made of 4 parts: 64 ROM, temperature sensor, non-volatile temperature alarming trigger TH and
TL, configuration register.Low-power consumption wait state will be entered after DS18B20 starting, when needing to be implemented temperature measurement and AD conversion,
Microprocessor issues instruction and completes temperature measurement and AD conversion, and DS18B20 is by the temperature data of generation in the form of two bytes
It stores in the temperature register of scratch pad memory, then, DS18B20 continues to remain waiting for state.When DS18B20 is by external electrical
When source powers, microprocessor initiates " reading time slot " after temperature transition instruction, passes through to read the temperature data measured
Bus completes the data communication with microprocessor.DS18B20 by temperature value and can be stored in TH after completing a temperature transition
The customized alarm preset value of user of each byte is compared in (high temperature trigger) and TL (low temperature trigger), deposit
S flag bit in device points out positive and negative when S=1 (be positive when S=0, be negative) of temperature value, if the temperature measured be higher than TH or
Lower than TL numerical value, alert if is set up, and set will be identified to an alarm inside DS18B20, at this point, microprocessor passes through sending
All DS18B20, which alarm, in search command [ECH] detection bus of alarming identifies, then, to the DS18B20 of alarm mark set
This search command will be responded.The temperature-measurement principle of DS18B20: the frequency of oscillation of low-temperature coefficient crystal oscillator is influenced by temperature very
Small, the pulse signal for generating fixed frequency gives subtraction count device 1, and high-temperature coefficient crystal oscillator varies with temperature its concussion frequency
Rate is substantially change, pulse input of the generated signal as subtraction count device 2, and when counting door opening, DS18B20 is just to low
It is counted after the clock pulses that temperature coefficient oscillator generates, and then completes temperature measurement.The opening time of door is counted by height
Temperature coefficient oscillator determines, every time before measurement, radix corresponding to -55 DEG C is respectively implanted 1 He of subtraction count device first
In temperature register, subtraction count device 1 and temperature register be preset at -55 DEG C corresponding to a base value.Subtraction count
Device 1 carries out subtraction count, the temperature when the preset value of subtraction count device 1 reduces to 0 to the pulse signal that low-temperature coefficient crystal oscillator generates
The value for spending register will add 1, and the preset of subtraction count device 1 will be loaded into again, and subtraction count device 1 restarts to low temperature system
The pulse signal that number crystal oscillator generates is counted, and so circulation stops temperature register when subtraction count device 2 count down to 0
Value adds up, and the numerical value in temperature register is measured temperature at this time.Slope accumulator is for compensating and correcting thermometric process
In it is non-linear, improve and measure accurate system, export the preset value for correcting subtraction count device, as long as counting door does not close yet
It closes and just repeats the above process, until temperature register value reaches measured angle value.
The on-line equipment of the utility model uses multilayer scene for a wide range of temperature field monitoring system of air cooling tubes condenser
Bus structures, this mode is very easy to the monitoring to Air-Cooling Island, cost reduces, wiring is simple.To realize that Air-Cooling Island is big
Area occupied temperature monitoring, cable for measuring temperature is as basic temperature element, the shortcomings that avoiding Conventional thermoelectric resistance thermometric mode, and can be with
According to the arbitrarily devised temperature measuring point distribution scheme of the design feature of Air-Cooling Island, preferred arrangement and monitoring effect.Temperature sensor thermometric
- 55 DEG C~+125 DEG C of range, temperature measurement error 0.0625 DEG C of resolution ratio, fully meets air cooling system temperature monitoring less than 0.5 DEG C
Needs.
The monitoring method of the Direct Air-Cooled temperature field on-Line Monitor Device of the utility model, comprising the following steps:
Step 1, several cable for measuring temperature A 31, and every thermometric are arranged at certain intervals respectively in aerial condenser lateral surface
Several temperature transducers 4 are arranged on cable A 31 at certain intervals.
Step 2, a cable for measuring temperature B 32, and thermometric are arranged in the outlet of direct air cooling system blower 6 of aerial condenser
Several temperature transducers 4 are arranged on cable B 32 at certain intervals.
Step 3, by several cable for measuring temperature A 31 and cable for measuring temperature B 32 connection collector 5, and collector 5 and monitoring are led
Machine 7 connects.
Step 4, the temperature transducer 4 on several cable for measuring temperature A 31 and cable for measuring temperature B 32 detects corresponding temperature survey respectively
The temperature of point, collector 5 acquire the temperature value of all temperature transducers 4 and are sent to monitoring host 7.
Step 5, since each temperature transducer 4 has carried out address code in advance, monitoring host 7 receives all temperature
It after value, is compared respectively with the temperature given threshold of each temperature value corresponding temperature measuring point, and temperature is carried out according to comparison result
Spend early warning.
When arranging cable for measuring temperature A 31, several cable for measuring temperature A 31 are arranged in and direct air cooling system steam-distributing pipe
The outer surface of 1 connected immediate system radiator tube bank 2, immediate system radiator tube bank 2 is by multiple fair current unit pipe bundles and more
A counter flow cell tube bank composition, multiple fair current unit pipe bundles form fair current area, and multiple counter flow cells restrain to form countercurrent zone, adjacent
Fair current unit pipe bundles and counter flow cell restrain to form concurrent-countercurrent junctional area, wherein it is several on a part of cable for measuring temperature A 31
Temperature transducer 4 is arranged on the temperature point of countercurrent zone, and several temperature transducers 4 on another part cable for measuring temperature A 31 are arranged
On fair current area temperature point, concurrent-countercurrent junctional area temperature point and countercurrent zone temperature point.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of Direct Air-Cooled temperature field on-Line Monitor Device characterized by comprising
Several cable for measuring temperature A (31), are arranged in aerial condenser lateral surface at regular intervals, and are located at and direct air cooling system
The outer surface of the connected immediate system radiator tube bank (2) of steam-distributing pipe (1)；
Cable for measuring temperature B (32) is arranged in direct air cooling system blower (6) outlet on the inside of aerial condenser；
Several temperature transducers (4) are arranged in several cable for measuring temperature A (31) and the cable for measuring temperature B at regular intervals
(32) on；
Collector (5) is connect with several cable for measuring temperature A (31) and the cable for measuring temperature B (32)；
It monitors host (7), is connect with the collector (5).
2. Direct Air-Cooled temperature field according to claim 1 on-Line Monitor Device, which is characterized in that immediate system radiator
Tube bank (2) is made of multiple fair current unit pipe bundles and the tube bank of multiple counter flow cells, and multiple fair current unit pipe bundles form fair current area, more
A counter flow cell restrains to form countercurrent zone, and adjacent fair current unit pipe bundles and counter flow cell restrain to form concurrent-countercurrent junctional area；
Several cable for measuring temperature A (31) include at least one the first cable for measuring temperature and at least one the second thermometrics of parallel arrangement
Cable；
Several temperature transducers (4) on first cable for measuring temperature are arranged on the temperature point of countercurrent zone, second thermometric
Several temperature transducers (4) on cable are arranged in fair current area temperature point, concurrent-countercurrent junctional area temperature point and countercurrent zone temperature
It spends on measuring point.
3. Direct Air-Cooled temperature field according to claim 2 on-Line Monitor Device, which is characterized in that the first thermometric electricity
Cable is located at the top of second cable for measuring temperature.
4. Direct Air-Cooled temperature field according to claim 2 on-Line Monitor Device, which is characterized in that several thermometric electricity
Cable A (31) includes first the first cable for measuring temperature (81) of parallel arrangement, the first cable for measuring temperature of Article 2 (82), first second
Cable for measuring temperature (83) and the second cable for measuring temperature of Article 2 (84).
5. Direct Air-Cooled temperature field according to claim 1 on-Line Monitor Device, which is characterized in that several thermometrics pass
Sensor (4) is encapsulated in several cable for measuring temperature A (31) and the cable for measuring temperature B (32) is internal.
6. Direct Air-Cooled temperature field according to claim 1 on-Line Monitor Device, which is characterized in that several thermometrics pass
Sensor (4) is connect by CAN converter with the collector (5), and the collector (5) passes through CAN converter and the monitoring
Host (7) connection.
7. Direct Air-Cooled temperature field according to claim 1 on-Line Monitor Device, which is characterized in that the collector (5)
Power module, telecommunication circuit, crystal oscillating circuit, display circuit, multichannel temperature are connect including microprocessor and with the microprocessor
Spend Acquisition Circuit, reset circuit, warning circuit, temperature setting key circuit and CAN bus circuit.
8. Direct Air-Cooled temperature field according to claim 7 on-Line Monitor Device, which is characterized in that several thermometrics pass
Sensor (4) is monobus type temperature sensor, and is connect with the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821163254.5U CN208547420U (en) | 2018-07-23 | 2018-07-23 | A kind of Direct Air-Cooled temperature field on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821163254.5U CN208547420U (en) | 2018-07-23 | 2018-07-23 | A kind of Direct Air-Cooled temperature field on-Line Monitor Device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208547420U true CN208547420U (en) | 2019-02-26 |
Family
ID=65425215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821163254.5U Active CN208547420U (en) | 2018-07-23 | 2018-07-23 | A kind of Direct Air-Cooled temperature field on-Line Monitor Device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208547420U (en) |
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2018
- 2018-07-23 CN CN201821163254.5U patent/CN208547420U/en active Active
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