CN113701906B - Method for measuring liquid temperature in liquid cooling loop - Google Patents
Method for measuring liquid temperature in liquid cooling loop Download PDFInfo
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- CN113701906B CN113701906B CN202110989245.1A CN202110989245A CN113701906B CN 113701906 B CN113701906 B CN 113701906B CN 202110989245 A CN202110989245 A CN 202110989245A CN 113701906 B CN113701906 B CN 113701906B
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- 239000007788 liquid Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001816 cooling Methods 0.000 title claims abstract description 44
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- -1 polypropylene Polymers 0.000 claims description 6
- 229910001018 Cast iron Inorganic materials 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 229910001296 Malleable iron Inorganic materials 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000009529 body temperature measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000012945 sealing adhesive Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The embodiment provides a method for measuring liquid temperature in a liquid cooling loop, which is characterized in that a tee pipe fitting is connected into a pipeline to be measured of the liquid cooling loop, a wire of a thermocouple is led into the pipeline to be measured through the tee pipe fitting which is different from an interface connected with the pipeline to be measured, so that the measurement of the liquid temperature in the liquid cooling loop is realized, the operability of the measurement of the liquid temperature in the liquid cooling loop is improved, the test cost is reduced, and the accuracy of the liquid reading temperature is high.
Description
Technical Field
The invention relates to the field of hard disk testing devices, in particular to a method for measuring liquid temperature in a liquid cooling loop.
Background
With the increasing demand in industry for efficient heat dissipation technology, liquid cooling technology gradually becomes one of the mainstream heat dissipation means due to its high green degree and low PUE value (energy consumption ratio), wherein fluid temperature is one of the important indexes for evaluating liquid cooling performance, and accurate measurement is required. However, accurate measurement of fluid temperature at laboratory or testing stages often requires tight seals, accurate instrumentation, and custom tubing, greatly increasing development cycle time and development costs. The following problems generally exist with conventional liquid cooling circuits for measuring fluid temperature:
(1) The heat conductivity coefficient of a pipeline used in a common liquid cooling loop is low, the surface of the pipeline is uneven, and the real liquid temperature cannot be obtained by directly measuring the surface temperature of the pipeline;
(2) The liquid expansion type thermometer is shock-resistant and low in cost, and is generally directly used for reading. If the traditional glass thermometer is placed in a pipeline, the temperature is difficult to read, and the pipeline with excellent flexibility originally cannot be bent and has the risk of breakage due to the placement of the thermometer;
(3) The shooting temperature of the non-contact thermal imager is easily affected by the emissivity of the surface of the pipeline, and the equipment cost is high;
(4) The ultrasonic phase shift technology is adopted to measure the temperature of the fluid in the pipe, and the temperature is measured on each section according to the acoustic characteristics of the liquid, but the temperature is limited by a measuring device, so that the actual operation is not easy;
(5) The existing bimetal thermometer in the market takes a thermal bimetal plate which is spirally shaped around a city thread as a temperature sensing device and is arranged in a protective sleeve, but the minimum size of the bimetal plate is larger than that of a liquid cooling pipeline, and the bimetal plate cannot be sealed well because of a rigid structure.
In view of the above drawbacks, it is desirable to devise a method for measuring the temperature of a liquid in a liquid cooled loop.
Disclosure of Invention
The invention aims to provide a method for measuring the liquid temperature in a liquid cooling loop, which improves the operability of liquid temperature measurement, reduces the measurement cost and improves the temperature measurement precision.
To achieve the above object, the present invention provides a method for measuring a liquid temperature in a liquid cooling circuit, comprising:
disconnecting the pipeline to be measured at the temperature measuring position;
connecting the disconnected pipeline to be tested through two interfaces of the tee pipe fitting; the method comprises the steps of,
and introducing a lead of a thermocouple into the pipeline to be tested through the interface of the tee pipe different from the interface connected with the pipeline to be tested.
Optionally, the tee pipe fitting is a T-shaped tee pipe, and comprises a transverse interface and a vertical interface.
Optionally, the material of the tee pipe fitting comprises polypropylene (PP) or Polyethylene (PE).
Optionally, the transverse joint of the tee pipe fitting is connected with the pipeline to be tested, and the transverse joint is provided with a spiral protrusion.
Optionally, the caliber of the transverse connector is smaller than the caliber of the pipeline to be tested.
Optionally, the vertical interface of the tee pipe fitting introduces the wire of the thermocouple, and the vertical interface is filled with liquid glue to prevent liquid leakage.
Optionally, the joint of the transverse connector and the pipeline to be tested is wrapped by a sealing adhesive tape.
Optionally, the material of the tee pipe fitting comprises cast iron, stainless steel, alloy steel, calcined cast iron or carbon steel.
Optionally, the transverse interface of the tee pipe fitting is provided with an internal thread and is in spiral connection with a barb head module with an external thread, and the barb head module is connected with the pipeline to be tested.
Optionally, a first rubber ring is further disposed between the transverse interface and the barb head module, so as to achieve end face sealing.
Optionally, the vertical interface of tee bend pipe fitting has the internal thread, and with the self-sealing head screwed connection of external screw thread.
Optionally, a second rubber ring is arranged in the center of the self-sealing head, and the sealing of the second rubber ring to the wire of the thermocouple is achieved by screwing the self-sealing head.
In summary, according to the method for measuring the liquid temperature in the liquid cooling loop provided by the embodiment, the three-way pipe fitting is connected into the pipeline to be measured of the liquid cooling loop, the wire of the thermocouple is led into the pipeline to be measured through the three-way pipe fitting which is different from the interface connected with the pipeline to be measured, so that the measurement of the liquid temperature in the liquid cooling loop is realized, the operability of the measurement of the liquid temperature in the liquid cooling loop is improved, the test cost is reduced, and the accuracy of the liquid reading temperature is high.
Drawings
FIG. 1 is a flow chart of a method for measuring a liquid temperature in a liquid cooling circuit according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a three-way pipe according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a structure of a three-way pipe fitting according to an embodiment of the present invention connected to a pipeline to be measured for measuring a liquid temperature;
FIG. 4 is a schematic view of a three-way pipe according to another embodiment of the present invention;
fig. 5A and 5B are schematic structural views of a self-sealing head according to another embodiment of the present invention;
figure 6 is a schematic view of a barb head module according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a three-way pipe fitting according to another embodiment of the present invention connected to a pipeline to be measured for measuring a liquid temperature.
Wherein, the reference numerals are as follows:
100. 200-tee pipe fittings; 101. 201-a lateral interface; 102. 202-interface; 103-spiral protrusion; 110. 210-a pipeline to be tested; 120. 220-wires of the thermocouple; 130-sealing tape; 140-liquid glue; 230-a first rubber ring; 300-sealing head; 301-a movable nut; 302-fixing the nut; 303-shrapnel; 304-a second rubber ring; 400-barb head module; 401-bolts; 402-plug.
Detailed Description
The method for measuring the temperature of a liquid in a liquid cooled circuit according to the invention is described in further detail below with reference to the accompanying drawings and examples. The advantages and features of the present invention will become more apparent from the following description and drawings, however, it should be understood that the inventive concept may be embodied in many different forms and is not limited to the specific embodiments set forth herein. The drawings are in a very simplified form and are to non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
The terms "first," "second," and the like in the description are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other sequences than described or illustrated herein. Similarly, if a method described herein comprises a series of steps, and the order of the steps presented herein is not necessarily the only order in which the steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method. If a component in one drawing is identical to a component in another drawing, the component will be easily recognized in all drawings, but in order to make the description of the drawings clearer, the specification does not refer to all the identical components in each drawing.
Example 1
Fig. 1 is a flowchart of a method for measuring a liquid temperature in a liquid cooling circuit according to the present embodiment. As shown in fig. 1, the method for measuring the temperature of a liquid in a liquid cooling loop provided in this embodiment includes:
s01: disconnecting the pipeline to be measured at the temperature measuring position;
s02: connecting the disconnected pipeline to be tested through two interfaces of the tee pipe fitting; the method comprises the steps of,
s03: and introducing a lead of a thermocouple into the pipeline to be tested through the interface of the tee pipe different from the interface connected with the pipeline to be tested.
Fig. 2 is a schematic structural diagram of a three-way pipe provided in the present embodiment, and fig. 3 is a schematic structural diagram of a three-way pipe provided in the present embodiment connected to a pipeline to be measured for measuring a liquid temperature. The method for measuring the temperature of the liquid in the liquid cooling circuit according to the present embodiment is described in detail below with reference to fig. 1 to 3.
Specifically, first, the pipeline 110 to be measured is disconnected at the temperature measuring position of the liquid cooling circuit. The pipeline 110 to be tested in the liquid cooling loop is generally a plastic pipeline, which can be cut off at a position where temperature measurement is required, and then the three-way pipe fitting 100 is inserted into the cut pipeline 110 to be tested, and the pipeline 110 to be tested is connected through the three-way pipe fitting 100.
In this embodiment, the tee pipe fitting 100 is a T-shaped tee pipe, and includes a transverse interface 101 and a vertical interface 102, where the transverse interface 101 of the tee pipe fitting 100 is connected to the pipeline 110 to be tested, and the vertical interface 102 of the tee pipe fitting 100 is used for introducing the wire 120 of the thermocouple. The caliber of the transverse connector 101 is smaller than that of the pipeline 110 to be tested, and spiral protrusions 103 are arranged on the transverse connector 101 and the vertical connector 102, so that when the transverse connector 101 is connected with the pipeline 110 to be tested, the three-way pipe fitting 100 and the pipeline 110 to be tested are fixed through the spiral protrusions 103.
When the three-way pipe fitting 100 can be connected to the pipeline 110 to be tested, the joint of the transverse connector 101 and the pipeline 110 to be tested is wrapped by a sealing tape 130 so as to ensure the sealing effect.
In this embodiment, the three-way pipe fitting 100 and the pipeline to be tested 110 are made of plastic materials, for example, the material of the three-way pipe fitting 100 includes polypropylene (PP) or Polyethylene (PE). In other embodiments of the present invention, the three-way pipe fitting may be of other types according to the specificity of the position of the pipeline to be tested, for example, a "Y" three-way pipe fitting may be used.
Then, the wire 140 of the thermocouple is introduced into the pipeline under test 110 through the vertical port 102 of the tee fitting 100. The vertical port 102 is filled with a liquid glue 140 to prevent liquid from leaking out through the vertical port 102 when the liquid temperature is measured.
Then, the data acquisition module is inserted into Agilent, the male end of the thermocouple is inserted into the female end of the tail end of the data acquisition module, the power supply of Agilent equipment is started, agilent is connected to a computer through a USB serial port, agilent software is opened, a configuration instrument is selected, the port name inserted by the thermocouple is checked, and the type of acquired data is set as 'TEMPERATURE', wherein the unit is DEG C. Setting a thermocouple name in the configuration channel according to the selected channel, then clicking a start button to start temperature acquisition, testing the liquid temperature of the liquid cooling loop, and smoothly reading the liquid temperature of an interface at the temperature measurement temperature.
The method is used for testing the liquid cooling condition of a 2p (2 p for short) system in a machine of a certain model, and a thermocouple is introduced between pipelines of two CPUs in a fixing mode of the thermocouple so as to read the outlet liquid temperature of the first CPU, namely the inlet temperature of the second CPU. The 205W CPU of the two intel purley platforms is adopted, the CPU is loaded with 205W, and data are collected according to the method. The obtained data are shown in the following table 1, wherein the outlet temperature of the CPU0 is the temperature obtained by the thermocouple in the method, and the data precision is high.
TABLE 1
According to the energy transfer formula delta t=p 0.86/G (where delta T is the fluid temperature difference, P is the heat, and G is the volume of fluid passing through the cross section in unit hour), the heat carried away by the liquid cooling in the liquid cooling loop can be calculated under the condition of knowing the flow and the temperature difference, so that the heat carried away by the liquid cooling in 5 sets of test data is about 160W, and the remaining about 20% of the heat is carried away by a fan with a duty ratio (fan duty ratio) of 30%.
The method for measuring the liquid temperature in the liquid cooling loop provided by the embodiment has the advantages of simple use principle, very low cost, no blockage to liquid cooling equipment, no influence on fluid flow, very accurate temperature data reading, wide application prospect and capability of being widely applied to daily tests.
The method for measuring the liquid temperature in the liquid cooling loop provided by the embodiment can be operated at the position of the bent pipeline, has good flexibility and is not influenced by the modeling of the loop of the pipe body; because a professional temperature reading instrument and software are used, the reading accuracy is very high; the method can be operated on any section needing to be measured, and is not limited; furthermore, in the implementation, the liquid temperature is measured by only connecting a three-way pipe fitting and a thermocouple wire in the original liquid cooling pipeline, so that the liquid cooling pipeline is easy to seal, and the risk of liquid leakage is avoided; in the liquid temperature measurement process, the pipeline to be measured basically has no resistance, the liquid flow in the pipeline is not influenced, and the heat dissipation is not influenced; in addition, since only the tee material and the sealing material are additionally used, the cost of measurement is very low.
Example two
The difference between the method for measuring the temperature of the liquid in the liquid cooling loop and the first embodiment is that the three-way pipe fitting connected to the pipeline to be measured of the liquid cooling loop in the embodiment is different, and the method for connecting the three-way pipe fitting to the pipeline to be measured is also different.
Fig. 4 is a schematic structural view of a three-way pipe provided in this embodiment, fig. 5A and 5B are schematic structural views of a self-sealing head provided in this embodiment, fig. 6 is a schematic structural view of a barb head module provided in this embodiment, and fig. 7 is a schematic structural view of a three-way pipe provided in this embodiment connected to a pipeline to be measured for measuring a liquid temperature. The method for measuring the temperature of the liquid in the liquid cooling circuit according to the present embodiment is described in detail below with reference to fig. 1 and fig. 4 to 7.
As shown in fig. 7, the method for measuring the temperature of the liquid in the liquid cooling loop provided in this embodiment includes: the transverse interface 201 of the three-way pipe fitting 200 is connected into the pipeline 210 to be tested through the barb head module 400, and the vertical interface 202 of the three-way pipe fitting 200 is used for realizing the introduction and sealing of the thermocouple wires 220 through the self-sealing head 300.
Specifically, in this embodiment, the three-way pipe fitting 200 is made of metal, and the material of the three-way pipe fitting 200 includes cast iron, stainless steel, alloy steel, calcinable cast iron, carbon steel, or the like. As shown in fig. 4, the lateral connector 201 of the three-way pipe 200 has an internal thread and is screwed with the externally threaded barb head module 200, and is connected with the pipe 210 to be tested through the barb head module 400. Optionally, a first rubber ring 230 is further disposed between the lateral interface 201 and the barb head module 400 to achieve end face sealing. Illustratively, as shown in fig. 6, the barb head module 400 includes a bolt 401 with external threads and a plug 402 with barbs, the bolt 401 is matched with the internal threads of the lateral port 201 of the tee pipe 200, and the connection between the tee pipe 200 and the pipe 210 to be tested is achieved through the screw connection between the bolt 401 and the lateral port 201. And because the tee pipe fitting 200 and the barb module 400 are both made of metal materials, the spiral connection sealing performance is good, and sealing tape is not needed to be used for assisting the sealing of the tee pipe fitting 200 and the barb module 400.
Illustratively, the vertical interface 202 of the tee fitting 200 has internal threads and is threadably coupled to the self-sealing head 300 having external threads. As shown in fig. 5A and 5B, the self-sealing head 300 includes a movable nut 301 and a fixing nut 302 connected to the movable nut, a through hole (not shown in the drawing) connected to the fixing nut 302 is provided with external threads, and cooperates with internal threads of the vertical joint 202 of the three-way pipe fitting 200 to realize connection between the three-way pipe fitting 200 and the self-sealing head 300. Similarly, the three-way pipe fitting 200 and the self-sealing head 300 are made of metal materials, so that the spiral connection has good sealing performance, and the sealing of the two parts is not assisted by using an adhesive tape.
The movable nut 301 is circumferentially provided with a plurality of retractable elastic pieces 303, and a second rubber ring 304 is provided in the center of the movable nut 301, as shown in fig. 5A. The movable nut 301 is rotated, the elastic sheet 303 stretches towards the center of the movable nut 301, and presses the second rubber ring 304, so that the second rubber ring 304 seals the wire 220 of the thermocouple, as shown in fig. 5B and 7.
Compared with the first embodiment, in the process of measuring the liquid temperature in this embodiment, there is no need to wrap the adhesive tape at the joint of the lateral interface 201 of the three-way pipe fitting 200 and the pipeline 210 to be measured, and there is no need to fill the liquid adhesive at the vertical interface 202 of the three-way pipe fitting 200, i.e. in this embodiment, the liquid cooling loop can be sealed without the need of the liquid adhesive and the sealing adhesive tape while measuring the temperature.
In summary, the present embodiment provides a method for measuring a liquid temperature in a liquid cooling loop, in which a three-way pipe is connected to a pipeline to be measured of the liquid cooling loop, a wire of a thermocouple is led into the pipeline to be measured through the three-way pipe different from an interface connected with the pipeline to be measured, so as to measure the liquid temperature in the liquid cooling loop, improve operability of liquid temperature measurement in the liquid cooling loop, reduce test cost, and have high accuracy of liquid reading temperature.
It should be noted that, the method and structure in this embodiment are described in a progressive manner, and the following description of the method and structure focuses on the differences between the previous method and structure, and for the structure disclosed in this embodiment, the description is relatively simple because of the correspondence with the method disclosed in the embodiment, and the relevant points refer to the description of the method section.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the claims, and any person skilled in the art may make any possible variations and modifications to the technical solution of the present invention using the method and technical content disclosed above without departing from the spirit and scope of the invention, so any simple modification, equivalent variation and modification made to the above embodiments according to the technical matter of the present invention fall within the scope of the technical solution of the present invention.
Claims (9)
1. A method of measuring a temperature of a liquid in a liquid cooled loop, comprising:
disconnecting the pipeline to be measured at the temperature measuring position;
connecting the disconnected pipeline to be tested through two interfaces of the tee pipe fitting; the method comprises the steps of,
the lead of the thermocouple is led into the pipeline to be tested through the interface of the tee pipe different from the interface connected with the pipeline to be tested;
the tee pipe fitting is a T-shaped tee pipe and comprises a transverse interface and a vertical interface;
the vertical interface of the three-way pipe fitting is provided with an internal thread and is in spiral connection with the self-sealing head with the external thread;
the self-sealing head comprises a movable nut and a fixed nut connected with the movable nut;
a plurality of telescopic elastic sheets are circumferentially arranged in the movable nut, and a second rubber ring is arranged in the center of the movable nut;
and the movable nut is rotated, the elastic sheet stretches towards the center of the movable nut, and the second rubber ring is extruded to seal the wire of the thermocouple by the second rubber ring.
2. The method of measuring the temperature of a liquid in a liquid cooled circuit according to claim 1, wherein the material of the tee fitting comprises polypropylene or polyethylene.
3. The method of measuring the temperature of a liquid in a liquid cooled circuit according to claim 2, wherein a lateral interface of the tee fitting is connected to the pipe under test and the lateral interface has a helical protrusion.
4. A method of measuring the temperature of a liquid in a liquid cooled circuit according to claim 3, wherein the transverse port has a smaller diameter than the conduit under test.
5. The method of measuring the temperature of a liquid in a liquid cooled circuit according to claim 4, wherein a vertical port of the tee fitting is introduced into a wire of the thermocouple and the vertical port is filled with a liquid gel to prevent leakage of the liquid.
6. The method of measuring the temperature of a fluid in a fluid-cooled circuit according to claim 4, wherein the junction of the lateral port and the pipe to be measured is wrapped with a sealing tape.
7. The method of measuring the temperature of a liquid in a liquid cooled circuit according to claim 1, wherein the material of the tee fitting comprises cast iron, stainless steel, alloy steel, malleable cast iron or carbon steel.
8. The method of measuring the temperature of a liquid in a liquid cooling circuit according to claim 7, wherein the transverse interface of the three-way pipe fitting is provided with internal threads and is in threaded connection with a barb head module with external threads, and the barb head module is connected with the pipeline to be measured.
9. The method of measuring the temperature of a liquid in a liquid cooled loop according to claim 8, wherein a first rubber ring is further provided between the lateral interface and the barb head module to effect an end face seal.
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| CN202110989245.1A CN113701906B (en) | 2021-08-26 | 2021-08-26 | Method for measuring liquid temperature in liquid cooling loop |
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| CN209296166U (en) * | 2018-11-07 | 2019-08-23 | 湖南汉华京电清洁能源科技有限公司 | A kind of small-bore pipeline temperature measuring equipment |
| CN211480849U (en) * | 2019-12-20 | 2020-09-11 | 西安宇斌信息科技有限公司 | Explosion-proof junction box wire outlet hole seal structure |
| CN212363500U (en) * | 2020-07-20 | 2021-01-15 | 中国科学院近代物理研究所 | Temperature measuring device for low-temperature negative-pressure fluid in pipe |
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| CN113701906A (en) | 2021-11-26 |
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