CN207528356U - A kind of multichannel temperature monitoring device for underground heat shallow well - Google Patents
A kind of multichannel temperature monitoring device for underground heat shallow well Download PDFInfo
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- CN207528356U CN207528356U CN201721757757.0U CN201721757757U CN207528356U CN 207528356 U CN207528356 U CN 207528356U CN 201721757757 U CN201721757757 U CN 201721757757U CN 207528356 U CN207528356 U CN 207528356U
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- underground heat
- shallow well
- temperature
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Abstract
Monitor field more particularly to a kind of multichannel temperature monitoring device for underground heat shallow well in real time the utility model is related to temperature.Include monitoring case, temperature sensing network and mounting assembly for the multichannel temperature monitoring device of underground heat shallow well.The utility model collects the optical signal of temperature using optical fiber Bragg grating temperature sensor, corresponding temperature data is converted by monitoring case and is sent to data monitoring center, solves existing monitoring device resistance to corrosion difference and easily by electromagnetic interference, it cannot be guaranteed that operation steady in a long-term in the presence of a harsh environment, the defects of being limited by complex geometry space, and can only realizing point measurement etc..
Description
Technical field
Field is monitored in real time the utility model is related to underground heat shallow well temperature more particularly to a kind of for the mostly logical of underground heat shallow well
Channel temp monitoring device.
Background technology
Shallow layer ground-temperature energy refers to contain Rock And Soil, underground in the range of earth's surface certain depth below (being generally less than 200 meters)
Generally below 25 DEG C of the thermal energy with value of exploiting and utilizing in water and surface water.
At present, China's shallow layer ground-temperature energy research degree is relatively low, and particularly all there is bottles for heat exchange efficiency, energy saving etc.
Neck, trace sth. to its source then for can not it is deterministic capture slim-hole heat exchanger channels in temperature space distribution situation.
The prior art carries out data acquisition using platinum resistance or DS18B20 temperature sensors, anticorrosive with monitoring device
It can force difference and easily by electromagnetic interference, it is impossible to ensure operation steady in a long-term in the presence of a harsh environment, by complex geometry space
The defects of limiting, and can only realizing point measurement etc..
Utility model content
In view of above-mentioned analysis, the utility model is intended to provide a kind of multichannel temperature for underground heat shallow well and monitors dress
It puts, to solve the problems, such as that existing apparatus channel is not expansible and number of sensors is single.
The purpose of this utility model is mainly achieved through the following technical solutions：
A kind of quasi-distributed temperature monitoring device of multichannel for underground heat shallow well, which is characterized in that including monitoring case, temperature
Spend sensing network and mounting assembly；
The temperature sensing network is connected with the connecting hole of monitoring case by communication cable；
The temperature sensing network is made of the temperature sensor string of multichannel, and each temperature sensor string includes at least one
A optical fiber Bragg grating temperature sensor；
Each temperature sensor string is fixedly mounted on by mounting assembly in underground heat shallow well monitoring holes.
The utility model has the beneficial effect that：Optical fiber Bragg grating temperature sensor is selected to measure temperature instead of traditional
Platinum resistance or DS18B20 temperature sensors because optical fiber transmission is lightwave signal, avoids original sensor and are easily done by electromagnetism
The defects of disturbing, and optical fiber is not perishable, can effectively ensure operation steady in a long-term in the presence of a harsh environment.And its temperature sensing
Network is made of multichannel temperature sensing string, solves the problems, such as that existing equipment can only realize that point type monitors.
On the basis of said program, the present invention has also done following improvement：
Further, the mounting assembly includes casing, steel wire rope and fixture；Each temperature sensor string is placed in a set
Guan Zhong, casing is vertical to be arranged in underground heat shallow well monitoring holes；
The temperature sensor string is placed in steel wire rope binding in casing, and the first section of steel wire rope is fixed on ground,
Tail end is equipped with weight, and each temperature sensor on sensor string is fixed on a steel cord by fixture, is set along steel wire rope is vertical
It is placed at the different height position of monitoring holes.
Advantageous effect using above-mentioned further scheme is：Sensor is fixed on the steel wire rope with weight so that steel wire
It restricts the main vertical pulling force of load-bearing, measurement error and damage caused by its own gravity to avoid temperature sensor.And by temperature sensing
Device and steel wire rope are arranged in casing, can not only protect temperature sensor, but also can quickly will be in temperature conduction to sensor.
Further, it is provided with filler between the underground heat shallow well monitoring holes and casing, it is ensured that casing and the complete coupling of the borehole wall
Close gapless.
Advantageous effect using above-mentioned further scheme is：With the method for backfill by gapless between casing and monitoring holes,
Heat is enabled preferably to be transmitted to temperature sensor, so as to reduce error.
Further, the filler for above return landwaste, magma grouting pour object；Alternatively, it is to include bentonite, cement, sand
With the mixture of water；Alternatively, for in-situ soil.
Advantageous effect using above-mentioned further scheme is：By filler selected as above-mentioned material, can effectively simulate
The soil conditions of script, reduce error to the greatest extent.
Further, the monitoring case, including photosignal transmitting and transmission assembly, photosignal conversion with processing component and
Microcontroller；
The microcontroller emits respectively with photosignal to be connected with transmission assembly, photosignal conversion with processing component；
Photosignal transmitting and transmission assembly and temperature sensing network connection, into the transmission of traveling optical signal；Photosignal emits and transmission
Component is converted with photosignal and is connect with processing component, and the optical signal transmission of temperature sensing network inputs to photosignal is converted
With processing component.
Advantageous effect using above-mentioned further scheme is：A monitoring case is selected, multiple circuits are integrated in monitoring case
In, it was not only convenient for carrying, but also that circuit is protected to exempt from is affected by environment.Sensing data is acquired, and data are adopted by these circuits
Collection, filtering, is converted to digital signal.
Further, the photosignal transmitting and transmission assembly, including scanning light source, fiber coupler, the three port rings of light
Shape device；
The microcontroller is connected with scanning light source circuit signal input；
Scanning light source outputs optical signals to the input port of fiber coupler, each dropping output port of fiber coupler
One sensor string, each remaining third port of optical circulator and photoelectric signal transformation and place are connected by an optical circulator
Reason component is connected.
Advantageous effect using above-mentioned further scheme is：Scanning light source sends out light signal, passes through fiber coupler
Light path is divided into multiple channels so that sensor can multichannel scanning simultaneously.Solves prior art extended channel real-time
The defects of poor.
Further, the scanning light source transmitting single channel C-band continuous spectrum；
Advantageous effect using above-mentioned further scheme is：C-band continuous spectrum is conducive into grating for scanning light source
Thermometric.
Further, the photosignal conversion and processing component, turn including photodetector, Weak Signal Processing device, AD
Parallel operation and data collector；
Photodetector is connected with the third port of optical circulator；Photodetector is connected with Weak Signal Processing device, micro-
After the signal of weak signal processor output carries out analog-to-digital conversion by AD converter, microcontroller is sent to via data collector
Device.
Advantageous effect using above-mentioned further scheme is：Convert optical signal into digital signal and the signal that will be handled well
Microcontroller is sent to, to obtain monitoring temperature.
Further, the quasi-distributed temperature monitoring device of multichannel for underground heat shallow well further includes electric energy supply electricity
Road, the electric energy supply circuit include lightning protection and solar energy converting apparatus；It is additionally provided in the monitoring case and microcontroller
Connected voltage conversion control circuit；
The lightning protection includes lightning rod and earth conductor, and the needle point of the lightning rod is upward, and is led with the ground connection
Body good connection；The terminal height is higher than the top of whole equipment；
The solar energy converting apparatus includes solar panels, rechargeable lithium battery group and intelligent solar charge and discharge control electricity
Road；Solar panel is connected with intelligent solar charge-discharge control circuit, and intelligent solar charge-discharge control circuit is with that can fill
Electric lithium battery is connected, and intelligent solar charge-discharge control circuit is connected with voltage conversion control circuit, powers for whole device.
Advantageous effect using above-mentioned further scheme is：Lithium is filled for this equipment by the electric energy that solar energy converts
Electric battery powered, so as to for whole equipment power, meets field monitoring in practice in the process to power supply the needs of.
Further, data transmission circuit is further included in the monitoring case, data transmission antenna is provided with outside monitoring case, it is described
Data transmission circuit is connected respectively with microcontroller and data transmission antenna, is sent data in control by data transmission antenna
The heart.
Advantageous effect using above-mentioned further scheme is：By data by data transmission circuit, it is sent to via antenna
Control centre so that the data monitored can be utilized in Data Control Center.
Other feature and advantage of the utility model will illustrate in the following description, also, from froming the perspective of the advantages of part
It becomes apparent in bright book or is understood by implementing the utility model.The purpose of this utility model and other advantages can
It realizes and obtains by specifically noted structure in the specification, claims and attached drawing write.
Description of the drawings
Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as the limitation to the utility model, entire
In attached drawing, identical reference mark represents identical component.
Fig. 1 is multichannel quasi-distributed temperature real-time test equipment installation of the utility model embodiment for underground heat shallow well
Schematic diagram,
Figure label：1- solar panels, 2- monitorings stent, 3- data transmission antennas, 4- monitoring cases, 5- communication light
Cable, 6- steel wire ropes, 7- underground heat shallow well, 8- backfill well cementation, 9- casings, 10- holding clamps, 11- temperature sensors, 12- weights,
13- lightning rods, 14- earth conductors；
Fig. 2 is the quasi-distributed temperature real-time test equipment electricity of multichannel of underground heat shallow well disclosed in the utility model embodiment
Lu Tu.
Specific embodiment
The preferred embodiment of the utility model is specifically described below in conjunction with the accompanying drawings, wherein, attached drawing forms the application one
Divide, and be used to illustrate the principle of the utility model together with the embodiment of the utility model.
The utility model can realize underground heat shallow well particularly shallow layer ground-temperature energy drilling quasi-distributed temperature monitoring, have
Temperature sensing is sensitive, sensing station flexible arrangement, electromagnetism interference and not by complex geometry space (such as small-bore wellbore)
The features such as being limited compared with adverse circumstances.
As shown in Figure 1, present embodiments provide a kind of quasi-distributed temperature real-time testing system of the multichannel of underground heat shallow well
Device, including solar panels 1, monitoring stent 2, data transmission antenna 3, monitoring case 4 and temperature sensor 11.
Monitoring case 4 is mounted on the upper end of monitoring stent 2, and circuit board and rechargeable lithium battery group are equipped with inside monitoring case 4.
Circuit board includes voltage conversion circuit, photosignal transmitting and transmission assembly, photosignal conversion and processing component, microcontroller
And data transmission circuit；Microcontroller is emitted by photosignal to be connected with transmission assembly with temperature sensing network；Temperature sensing
Network emits with photosignal to be connected with transmission assembly, and via photosignal conversion and processing component, collected data are sent out
It is sent in microcontroller.
Preferably, solar panel 1 is mounted on the upper end of monitoring stent 2, passes through voltage conversion circuit and chargeable lithium
Battery pack is connected, and electric energy is provided for whole equipment.
Specifically, solar panel 1 completes conversion of the solar energy to electric energy, and passes through intelligent solar charge and discharge control
Device is stored into rechargeable lithium battery group；Meanwhile rechargeable lithium battery group is entire by intelligent solar charging-discharging controller
Monitoring system provides the supply of 12V power supplys.
Preferably, lightning protection is further included, the lightning protection includes lightning rod 13 and earth conductor 14, lightning rod 13
Highly higher than the height of monitoring stent 2.
Specifically, photosignal transmitting includes scanning light source, fiber coupler, three ports light rings with transmission assembly；
Microcontroller is connected with scanning light source signal control terminal, and scanning light source outputs optical signals to the input port of fiber coupler, light
Each branch port of fine coupler connects a sensor string, each remaining third of optical circulator by an optical circulator
Port is connected with photoelectric signal transformation with processing component.
Preferably, scanning light source transmitting single channel C-band (1527-1568nm) continuous spectrum, into fiber coupler point
It scans, is scanned while can theoretically realizing 2n (n=0,1,2,3 ...) road optical signal, still simultaneously for multipath light signal
Due to every single order coupler all exist loss, in order to ensure optical signal detection with transmission validity, it is proposed that the value of n be less than etc.
In 4.The port 1 of three independent port photocirculator circuits is respectively enterd per channel optical signal, and enters temperature sensing from port 2
Device, the optical signal that temperature information is carried in temperature sensor are entered, and pass through port 3 by the port 2 of three port photocirculators
Enter photosignal conversion and processing component.Optical circulator can realize the separation to incident light and reflected light, ensure that light
Signal is not interfere with each other, and realizes effective differentiation of transmitting signal and data-signal.
Specifically, photosignal conversion with processing component include photodetector, Weak Signal Processing device, AD converter and
Data collector.Optical circulator circuit is connected with three port of ground of photodetector；Photodetector and Weak Signal Processing device
It is connected, after the signal that Weak Signal Processing device exports carries out analog-to-digital conversion by AD converter, is sent to via data collector
Microcontroller.
Specifically, microcontroller includes data storage circuitry and microprocessor.Photosignal conversion is turned with processing component
The data of change are sent in microprocessor, and microprocessor is simultaneously stored data into data storage circuitry, then by data transmission electricity
Road is sent to Data Control Center.
It should be noted that microcontroller can be achieved using existing various chips, only it is excitation scanning light source transmitting
The sensing terminal data of input are stored in internal memory by light wave, control the conversion of voltage, and program is conventional program, this reality
It applies example and is not related to improvement to microcontroller Program agreement.
Temperature sensor 11 is connected by communication cable 5 with the optical circulator inside monitoring case 4.
Specifically, temperature sensor 11 is made of multichannel optical fiber Bragg grating temperature sensor (FBG) string, Mei Geguang
Fine Bragg grating temperature sensor string is at least connected 1 temperature sensors of high precision, anti-by grating sensor wavelength change
Inductive sensing device ambient temperature situation.
Below with a specific Installation Example, illustrate installation and the principle of the monitoring device of the present embodiment.
According to shallow layer ground-temperature energy Exploitation and utilization model, different drilling kinds, can be respectively in connection with this practicality with utilizing method
The monitoring device of new embodiment carries out monitoring respectively.
Specifically, background value monitoring holes are generally single hole single channel, and channel diameter about 100mm can be new by using this practicality
The multichannel of type embodiment carries out quasi-distributed hierarchical monitor；The general single-hole multi-channel in heat transfer experiments hole is reconnoitred, channel is in underground
Using connection, binary channels U-tube is formed, single channel diameter about 32mm can respectively be monitored with reference to multichannel；It is general to develop and use hole
It is about 32mm for diplopore (exploitation hole and water injection hole) single channel or multichannel, single channel diameter, distinguishes using multichannel split
It adopts hole and water injection hole monitors respectively.
After shallow layer ground-temperature energy shallow bore hole pore-forming, zinc-plated casing of going into the well (or PE types U-tube), by above return landwaste, magma into
Row grouting pours or the mixture according to detection requirement using bentonite, cement, sand and water, can also be increased according to earthen backfill in situ
Add heat exchange accuracy backfill, it is ensured that casing and borehole wall complete coupling gapless.
The sensor string of temperature sensing network and steel wire rope of going into the well are gone into the well by the binding of steel card by portable winch, steel wire
Weight is fixed at tail of rope end, ensures that steel wire rope keeps vertical and goes into the well, each sensor is separately fixed on steel wire rope, utilizes steel wire rope
Main vertical pulling force is undertaken, to avoid temperature sensor because its own gravity causes measurement error and damage.
The channel of sensor string and the position of decentralization are recorded, by steel wire rope by bundled fixed at the wellhead casing pipe of ground,
Steel wire rope is made to be relatively fixed with casing, in order to avoid casing settlement influence monitoring data.
Electric energy supply circuit is further included for the quasi-distributed temperature monitoring device of multichannel of underground heat shallow well, wherein, electric energy
Supply circuit includes lightning protection and solar energy converting apparatus.Lightning protection includes lightning rod and earth conductor, the lightning rod
Needle point it is upward, and with the earth conductor good connection, and terminal height be higher than whole equipment top.
Solar energy converting apparatus includes solar panels, rechargeable lithium battery group and intelligent solar charge-discharge control circuit；
Solar panel is connected with intelligent solar charge-discharge control circuit, intelligent solar charge-discharge control circuit and chargeable lithium
Battery is connected, and intelligent solar charge-discharge control circuit is connected with voltage conversion control circuit, powers for whole device.
Stationary monitoring stent and lightning-arrest external member, installation solar panel, monitoring case, connecting wire simultaneously respectively pass temperature
Sense network is connected to the optical circulator flange of ground monitoring system according to channel.
Below with a specifically used example, illustrate the use of the monitoring device of the present embodiment.
Start monitoring system power supply, microcontroller by scanning light source send out control signal (including：Sweep spacing and wave
Long range etc.), laser signal enters fiber coupler group and is divided into multichannel optical signal, and each channel optical signal passes through one respectively
The optical circulator of three ports is entered in fixed sensor string.
The pre-embossed grid meeting reflected laser signals of temperature sensor, after being changed by ambient temperature, pre-embossed raster grid
Variation can be followed, the form of expression is the centre wavelength of wavelength departure sensor original state that is reflected, and offset is sensed
Device itself coefficient and environment temperature control, sensor itself coefficient are constant, test indoor measurement, therefore optical grating reflection wavelength is inclined
Shifting amount (wavelength difference of test wavelength and centre wavelength) and variation of ambient temperature amount (temperature difference of test environment and calibration environment)
Direct proportionality.
Specifically, be additionally provided with data transmission antenna outside monitoring case, data transmission circuit respectively with microcontroller and data
Transmission antenna is connected, and control centre is sent data to by data transmission antenna.The reflection wavelength for carrying temperature information passes through light
Circulator enters photoelectric sensor assembly and is converted to ultra-weak electronic signal, and digital signal is converted by shaping, amplification, analog signal
Enter acquisition module data afterwards to acquire, and preserved after final data are handled by microprocessor module to data memory module
And it is sent to Data Control Center using antenna and wireless public network.
In conclusion the utility model embodiment provides a kind of quasi-distributed temperature prison of multichannel for underground heat shallow well
Device is surveyed, realizes the quasi-distributed temperature survey of shallow layer ground-temperature energy underground heat shallow well, has that channel is expansible, sensor series number
The features such as measuring more, electromagnetism interference and not limited by adverse circumstances such as complex geometry spaces, is commonly led to per channel by single
The transmission of temperature signal can be realized in news optical cable connection, while with the increase of temperature in borehole test space resolution ratio, unit letter
The procurement cost of breath substantially reduces, and a kind of effective prison is provided for the longer-term networkization measurement of shallow well high precision temp degrees of data
Survey technology.
The preferable specific embodiment of the above, only the utility model, but the scope of protection of the utility model is not
This is confined to, in the technical scope that any one skilled in the art discloses in the utility model, can be readily occurred in
Change or replacement, should be covered within the scope of the utility model.
Claims (10)
1. a kind of multichannel temperature monitoring device for underground heat shallow well, which is characterized in that including monitoring case, temperature sensing network
And mounting assembly；
The temperature sensing network is connected with the connecting hole of monitoring case by communication cable；
The temperature sensing network is made of the temperature sensor string of multichannel, and each temperature sensor string includes at least one light
Fine Bragg grating temperature sensor；
Each temperature sensor string is fixedly mounted on by mounting assembly in underground heat shallow well monitoring holes.
2. the multichannel temperature monitoring device according to claim 1 for underground heat shallow well, which is characterized in that the installation
Component includes casing, steel wire rope and fixture；Each temperature sensor string is placed in a casing, and casing is vertical to be arranged on underground heat
In shallow well monitoring holes；
The temperature sensor string is placed in steel wire rope binding in casing, and the head end of steel wire rope is fixed on ground, tail end
Equipped with weight, each temperature sensor on sensor string is fixed on a steel cord by fixture, is set to along steel wire rope is vertical
At the different height position of monitoring holes.
3. the multichannel temperature monitoring device according to claim 2 for underground heat shallow well, which is characterized in that the underground heat
Filler is provided between shallow well monitoring holes and casing, it is ensured that casing and borehole wall complete coupling gapless.
4. the multichannel temperature monitoring device according to claim 3 for underground heat shallow well, which is characterized in that the filling
Object is above returns landwaste, magma grouting pours object；Alternatively, it is the mixture for including bentonite, cement, sand and water；Alternatively, to be in situ
Soil.
5. the multichannel temperature monitoring device for underground heat shallow well according to one of claim 1-4, which is characterized in that institute
Monitoring case is stated, including photosignal transmitting and transmission assembly, photosignal conversion and processing component and microcontroller；
The microcontroller emits respectively with photosignal to be connected with transmission assembly, photosignal conversion with processing component；Photoelectricity
Signal transmitting and transmission assembly and temperature sensing network connection, into the transmission of traveling optical signal；Photosignal emits and transmission assembly
It converts with photosignal and is connect with processing component, the optical signal transmission of temperature sensing network inputs to photosignal is converted and located
Manage component.
6. the multichannel temperature monitoring device according to claim 5 for underground heat shallow well, which is characterized in that the photoelectricity
Signal emits includes scanning light source, fiber coupler, three ports light rings with transmission assembly；
The microcontroller is connected with scanning light source control terminal；
Scanning light source outputs optical signals to the input port of fiber coupler, and each dropping output port of fiber coupler passes through
One optical circulator connects a sensor string, each remaining third port of optical circulator and photoelectric signal transformation and processing group
Part is connected.
7. the multichannel temperature monitoring device according to claim 6 for underground heat shallow well, which is characterized in that the scanning
Light source emits single channel C-band continuous spectrum.
8. the multichannel temperature monitoring device according to claim 6 for underground heat shallow well, which is characterized in that the photoelectricity
Signal is converted includes photodetector, Weak Signal Processing device, AD converter and data collector with processing component；
Photodetector is connected with the third port of optical circulator；Photodetector is connected with Weak Signal Processing device, faint letter
After the signal of number processor output carries out analog-to-digital conversion by AD converter, microcontroller is sent to via data collector.
9. the multichannel temperature monitoring device according to claim 1 for underground heat shallow well, which is characterized in that described to be used for
The quasi-distributed temperature monitoring device of multichannel of underground heat shallow well further includes electric energy supply circuit, and the electric energy supply circuit includes keeping away
Thunder equipment and solar energy converting apparatus；The voltage conversion control circuit being connected with microcontroller is additionally provided in the monitoring case；
The lightning protection includes lightning rod and earth conductor, and the needle point of the lightning rod is upward, and good with the earth conductor
Good connection；The terminal height is higher than the top of whole equipment；
The solar energy converting apparatus includes solar panels, rechargeable lithium battery group and intelligent solar charge-discharge control circuit；
Solar panel is connected with intelligent solar charge-discharge control circuit, intelligent solar charge-discharge control circuit and chargeable lithium
Battery is connected, and intelligent solar charge-discharge control circuit is connected with voltage conversion control circuit, powers for whole device.
10. the multichannel temperature monitoring device according to claim 1 for underground heat shallow well, which is characterized in that the prison
Further include data transmission circuit in measuring tank, be provided with data transmission antenna outside monitoring case, the data transmission circuit respectively with it is micro-
Controller is connected with data transmission antenna, and control centre is sent data to by data transmission antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721757757.0U CN207528356U (en) | 2017-12-15 | 2017-12-15 | A kind of multichannel temperature monitoring device for underground heat shallow well |
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| CN201721757757.0U CN207528356U (en) | 2017-12-15 | 2017-12-15 | A kind of multichannel temperature monitoring device for underground heat shallow well |
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| CN207528356U true CN207528356U (en) | 2018-06-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113008401A (en) * | 2021-03-15 | 2021-06-22 | 江苏省水文地质工程地质勘察院 | System and method for monitoring field ground temperature of buried pipe ground source heat pump heat exchange system |
| CN116291394A (en) * | 2023-03-23 | 2023-06-23 | 中国地质大学（北京） | Shallow well soil layer stepped geothermal temperature measurement drilling device |
-
2017
- 2017-12-15 CN CN201721757757.0U patent/CN207528356U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113008401A (en) * | 2021-03-15 | 2021-06-22 | 江苏省水文地质工程地质勘察院 | System and method for monitoring field ground temperature of buried pipe ground source heat pump heat exchange system |
| CN116291394A (en) * | 2023-03-23 | 2023-06-23 | 中国地质大学（北京） | Shallow well soil layer stepped geothermal temperature measurement drilling device |
| CN116291394B (en) * | 2023-03-23 | 2024-02-02 | 中国地质大学（北京） | Shallow well soil layer stepped geothermal temperature measurement drilling device |
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