CN110440943B - Temperature measuring method - Google Patents
Temperature measuring method Download PDFInfo
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- CN110440943B CN110440943B CN201910607170.9A CN201910607170A CN110440943B CN 110440943 B CN110440943 B CN 110440943B CN 201910607170 A CN201910607170 A CN 201910607170A CN 110440943 B CN110440943 B CN 110440943B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/32—Measuring temperature based on the expansion or contraction of a material the material being a fluid contained in a hollow body having parts which are deformable or displaceable
- G01K5/34—Measuring temperature based on the expansion or contraction of a material the material being a fluid contained in a hollow body having parts which are deformable or displaceable the body being a capsule
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/32—Measuring temperature based on the expansion or contraction of a material the material being a fluid contained in a hollow body having parts which are deformable or displaceable
- G01K5/46—Measuring temperature based on the expansion or contraction of a material the material being a fluid contained in a hollow body having parts which are deformable or displaceable with electric conversion means for final indication
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Abstract
The invention discloses a temperature measuring method, which comprises the following steps: s1, placing the temperature-measuring fluid medium in a container, and arranging a liquid level linkage mechanism linked with the liquid level change of the temperature-measuring fluid medium on the container; s2, converting the liquid level change of the temperature measuring fluid medium caused by thermal expansion and cold contraction into the displacement change of the liquid level linkage mechanism through the liquid level linkage mechanism; s3, detecting a displacement change value generated by the liquid level linkage mechanism through a displacement sensor; and S4, converting the displacement change value into a corresponding temperature signal and outputting the temperature signal. The temperature measuring method provided by the invention adopts the mechanical liquid level linkage mechanism to detect the volume change of the temperature measuring fluid medium, so as to obtain the temperature signal, and the temperature measuring method has the advantages of higher temperature measuring precision, better temperature measuring stability and difficult influence of environmental factors.
Description
Technical Field
The invention belongs to the technical field of temperature measurement, and particularly relates to a temperature measurement method.
Background
At present, body temperature measuring equipment mainly comprises a physical thermometer and a digital thermometer, wherein the physical thermometer mainly comprises a mercury thermometer, an alcohol thermometer and the like, and the digital thermometer mainly comprises an infrared body temperature gun, a thermocouple digital display thermometer and the like.
Among the thermometers, the physical thermometer has been widely accepted due to its low cost and high accuracy, but the physical thermometer has a long measurement time and a great limitation in digital application. Although the digital thermometer has great progress in convenience of use and expansibility of digital application, the measurement accuracy of the digital thermometer is not satisfactory because of being susceptible to environmental factors.
Chinese patent publication No. CN1051636C discloses a temperature sensor, which detects the height of a liquid column of an expansion liquid by a liquid level displacement sensor, and converts a temperature signal into an electrical signal, and this temperature sensor uses a non-contact liquid level displacement sensor to detect the liquid level, and because the non-contact detection mode has low precision and poor stability, the performance of the temperature sensor needs to be improved.
Disclosure of Invention
To solve at least one of the above technical problems, the present invention provides a temperature measurement method.
The purpose of the invention is realized by the following technical scheme:
a temperature measuring method is provided, which comprises the following steps:
s1, placing the temperature-measuring fluid medium in a container, and arranging a liquid level linkage mechanism linked with the liquid level change of the temperature-measuring fluid medium on the container;
s2, converting the liquid level change of the temperature measuring fluid medium caused by thermal expansion and cold contraction into the displacement change of the liquid level linkage mechanism through the liquid level linkage mechanism;
s3, detecting a displacement change value generated by the liquid level linkage mechanism through a displacement sensor;
and S4, converting the displacement change value into a corresponding temperature signal and outputting the temperature signal.
As a further improvement, the container is provided with a liquid level change cavity which generates reciprocating liquid level change along with temperature measurement fluid medium due to expansion with heat and contraction with cold, and the liquid level linkage mechanism is a reciprocating liquid level linkage mechanism which is linked with the liquid level change in the liquid level change cavity.
As a further improvement, the container comprises a container shell, a containing cavity is formed inside the container shell, the temperature measuring fluid medium is placed in the containing cavity, the liquid level change cavity is a push rod cylinder cavity arranged on the container shell, the inner end of the push rod cylinder cavity is communicated to the containing cavity, the outer end of the push rod cylinder cavity is communicated to the outside, the liquid level linkage mechanism comprises an elastic reset mechanism and a push rod which is arranged in the push rod cylinder cavity and can axially move along the push rod cylinder cavity, the periphery of the inner end of the push rod is in sliding seal fit with the wall surface of the push rod cylinder cavity, and the elastic reset mechanism is connected with the push rod and enables the push rod to move towards the.
As a further improvement, in step S2, the displacement change generated by the liquid level linkage mechanism is an axial displacement change of the push rod, and in step S3, the displacement sensor is used for detecting an axial displacement change value of the push rod.
As a further improvement, in step S4, the axial displacement variation value of the push rod is converted into a corresponding temperature signal by a temperature conversion module connected to the displacement sensor, and the temperature signal is output and displayed by a display module connected to the temperature conversion module.
As a further improvement, the displacement sensor is a capacitive grating sensor or a magnetic grating sensor.
As a further improvement, the capacitive gate sensor is an absolute capacitive gate sensor; or, the grating sensor is an absolute grating sensor; or, the magnetic grid sensor is an absolute magnetic grid sensor.
As a further improvement, an overflow cylinder cavity with an inner end communicated to the containing cavity and an outer end communicated to the outside is arranged on the container shell, an overflow piston capable of axially moving along the overflow cylinder cavity is arranged in the overflow cylinder cavity, and the overflow piston is connected with an overflow spring capable of enabling the overflow piston to move inwards.
As a further improvement, the outer end of the overflow cylinder cavity is in threaded connection with an end cover, the end cover is provided with a guide groove, the overflow piston is fixedly provided with a guide rod penetrating out of the guide groove, the overflow spring is sleeved on the guide rod, and two ends of the overflow spring are respectively propped between the overflow piston and the end cover.
As a further improvement, the main body of the container shell is a flat hexahedron, and a heat conducting grid is formed inside the container shell.
The temperature measuring method provided by the invention comprises the following steps: s1, placing the temperature-measuring fluid medium in a container, and arranging a liquid level linkage mechanism linked with the liquid level change of the temperature-measuring fluid medium on the container; s2, converting the liquid level change of the temperature measuring fluid medium caused by thermal expansion and cold contraction into the displacement change of the liquid level linkage mechanism through the liquid level linkage mechanism; s3, detecting a displacement change value generated by the liquid level linkage mechanism through a displacement sensor; and S4, converting the displacement change value into a corresponding temperature signal and outputting the temperature signal. The temperature measuring method provided by the invention adopts the mechanical liquid level linkage mechanism to detect the volume change of the temperature measuring fluid medium, so as to obtain the temperature signal, and the temperature measuring method has the advantages of higher temperature measuring precision, better temperature measuring stability and difficult influence of environmental factors.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a block flow diagram of a thermometry method of the present invention.
FIG. 2 is a schematic view of a three-dimensional assembly structure of a temperature measuring device for implementing the temperature measuring method of the present invention.
FIG. 3 is a perspective view, partially in section, of a vessel shell of a thermometric apparatus for carrying out the thermometry method of the present invention.
FIG. 4 is a schematic view of an assembly structure of an overflow piston, an overflow spring, an end cover and a guide rod of a temperature measuring device for implementing the temperature measuring method of the present invention.
FIG. 5 is a schematic view of a three-dimensional assembly structure of a push rod, a bearing bush, a constant-pressure breathable film and a sleeve of a temperature measuring device for implementing the temperature measuring method of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
Referring to fig. 1 to 5, an embodiment of the present invention provides a temperature measurement method, including the following steps:
and S1, placing the temperature-measuring fluid medium in a container, and arranging a liquid level linkage mechanism linked with the liquid level change of the temperature-measuring fluid medium on the container. Specifically, a liquid level change cavity which generates reciprocating liquid level change along with temperature measurement fluid medium due to expansion with heat and contraction with cold is arranged on the container, and the liquid level linkage mechanism is a reciprocating liquid level linkage mechanism which is linked with the liquid level change in the liquid level change cavity. More specifically, the container comprises a container shell, a containing cavity is formed inside the container shell, the temperature measuring fluid medium is placed in the containing cavity, the liquid level change cavity is a push rod cylinder cavity arranged on the container shell, the inner end of the push rod cylinder cavity is communicated to the containing cavity, the outer end of the push rod cylinder cavity is communicated to the outside, the liquid level linkage mechanism comprises an elastic reset mechanism and a push rod which is arranged in the push rod cylinder cavity and can axially move along the push rod cylinder cavity, the periphery of the inner end of the push rod is in sliding seal fit with the wall surface of the push rod cylinder cavity, and the elastic reset mechanism is connected with the push rod and enables the push rod to move towards.
And S2, converting the liquid level change of the temperature measuring fluid medium caused by thermal expansion and cold contraction into the displacement change of the liquid level linkage mechanism through the liquid level linkage mechanism. Specifically, the displacement change generated by the liquid level linkage mechanism is the axial displacement change of the push rod.
And S3, detecting a displacement change value generated by the liquid level linkage mechanism through a displacement sensor, specifically, the displacement sensor is used for detecting an axial displacement change value of the push rod, and the displacement sensor is a capacitive grating sensor or a magnetic grating sensor.
And S4, converting the displacement change value into a corresponding temperature signal and outputting the temperature signal. Specifically, the axial displacement change value of the push rod is converted into a corresponding temperature signal through a temperature conversion module connected with the displacement sensor, and the temperature signal is output and displayed through a display module connected with the temperature conversion module.
When the temperature measuring method provided by the embodiment of the invention is implemented, the temperature measuring fluid medium can generate an expansion and contraction effect due to temperature change, when the volume of the temperature measuring fluid medium expands, the temperature measuring fluid medium is pushed out of the push rod through the push rod barrel cavity, when the volume of the temperature measuring fluid medium contracts, the push rod retracts through the elastic reset mechanism, so that the push rod can generate corresponding displacement change due to the temperature change, the displacement sensor is used for accurately detecting the displacement of the push rod, the temperature conversion module is used for converting the displacement into a temperature change signal, and the temperature output module is used for outputting the temperature signal. The temperature measuring method provided by the embodiment of the invention adopts the mechanical liquid level linkage mechanism to detect the volume change of the temperature measuring fluid medium, so as to obtain the temperature signal, and the temperature measuring method has the advantages of higher temperature measuring precision, better temperature measuring stability and difficult influence of environmental factors.
In a further preferred embodiment, the displacement sensor is a capacitive grating sensor or a magnetic grating sensor. The measurement precision of the capacitive grating sensor, the grating sensor and the magnetic grating sensor can reach 0.01mm-0.001mm, a relative capacitive grating sensor can be used for measuring tiny position change, and an absolute capacitive grating sensor can also be used for measuring an absolute position. When the displacement sensor is an incremental relative capacitive grating sensor or a magnetic grating sensor, the displacement sensor cannot measure the change of the liquid level height after power failure, and at the moment, if temperature measurement is to be carried out again, the corresponding relation between the liquid level height and a certain initial temperature needs to be reset, preferably, the initial temperature is the maximum measuring range corresponding temperature, and the reset corresponding position is the maximum liquid level height. For this purpose, the displacement sensor is provided with a reset calibration key which can be triggered when the push rod is positioned at the outermost end of the push rod barrel cavity. Because the displacement sensor is provided with a reset calibration key, when the mechanical structure touches the reset calibration key, a reset calibration signal can be generated, and the initial temperature reset is carried out by a built-in control program, so that the reset calibration is realized. The present embodiment is configured such that the reset calibration key can be activated to transmit a reset calibration signal when the push rod is located at the outermost end of the push rod barrel cavity.
In a further preferred embodiment, the capacitive sensor is an absolute capacitive sensor; or, the grating sensor is an absolute grating sensor; or, the magnetic grid sensor is an absolute magnetic grid sensor. The displacement sensor adopts an absolute type capacitive grating sensor or an absolute type magnetic grating sensor, can directly measure the displacement height value, does not need a reset calibration structure, does not need continuous electrification of the sensor, and is electrified only when measurement is needed, so that the electric quantity of a battery can be greatly saved, and the service life is prolonged.
In order to realize the temperature measuring method, the embodiment of the invention also provides a temperature measuring device, the temperature measuring device comprises a container shell 1, and a containing cavity 2 is formed inside the container shell 1. The container shell 1 is a metal container shell, the container shell 1 is made of metal materials, the preferred materials are alloy steel with high heat conduction efficiency such as stainless steel, and the heat conductivity of the metal materials is far greater than that of glass materials, so that efficient heat conduction can be realized, and rapid measurement is guaranteed. The main body of the container shell 1 is a flat hexahedron, preferably a flat cuboid structure, so that the contact area with a measured object is increased as much as possible under the same volume, and the heat conduction efficiency is improved. The container shell is internally provided with a heat conduction grid, the heat conduction grid divides the containing cavity into a plurality of sub-containing cavities which are communicated with each other, the grid is formed in the container shell, the heat conduction rate can be further increased, meanwhile, the heat conduction grid structure can enhance the rigidity of the container, and the structural safety is further improved. The cavity 2 is filled with a temperature measurement fluid medium, the temperature measurement fluid medium is liquid metal or liquid metal alloy, such as mercury or gallium-indium alloy, and the thermal volume expansion coefficient of the liquid metal is extremely stable in a common temperature range, so that the measurement accuracy can be ensured. The container shell 1 is provided with a push rod barrel cavity 3, the inner end of the push rod barrel cavity is communicated to the containing cavity 2, the outer end of the push rod barrel cavity is communicated to the outside, a push rod 4 capable of axially moving along the push rod barrel cavity 3 is arranged in the push rod barrel cavity 3, and the periphery of the inner end of the push rod 4 is in sliding sealing fit with the wall surface of the push rod barrel cavity 3. The push rod 4 is connected with an elastic reset mechanism 5 which enables the push rod 4 to move towards the inner end and a displacement sensor 6 which is used for detecting the displacement of the push rod 4. Displacement sensor 6 is connected with and is used for turning into the temperature conversion module 7 of temperature change signal with the displacement volume, temperature conversion module 7 is connected with the temperature output module 8 that is used for exporting temperature signal, displacement sensor 6, temperature conversion module 7, temperature output module 8 are connected with power 9, and power 9 supplies power to displacement sensor 6, temperature conversion module 7, temperature output module 8. Wherein, the temperature output module 8 can be a display such as a dot matrix LED screen or a liquid crystal screen to display the temperature; temperature output module also can be voice prompt such as speaker to carry out the voice broadcast temperature, temperature output module 8 can also send temperature signal to third party's equipment through wireless transmission's mode.
The temperature measuring device of this embodiment is at the during operation, because the change of temperature can make temperature measurement fluid medium produce expend with heat and contract with cold effect, when the volume expansion of temperature measurement fluid medium, the push rod is released through push rod barrel chamber to temperature measurement fluid medium, when the volume shrink of temperature measurement fluid medium, elasticity canceling release mechanical system makes the push rod retract, the change of temperature can make the push rod produce corresponding displacement change like this, the displacement volume of rethread displacement sensor accurate detection push rod, the temperature conversion module turns into the temperature change signal with the displacement volume, rethread temperature output module output temperature signal. The temperature measuring device provided by the invention adopts a mechanical mechanism to detect the volume change of the temperature measuring fluid medium, so that a temperature signal is obtained, and the temperature measuring device is not easily influenced by environmental factors, and has stable performance, high reliability and high safety.
As a further preferred embodiment, the container housing 1 is fixed on a bottom plate 10, two rows of positioning pillars 11 are symmetrically arranged on the bottom plate 10 along the length direction of the push rod 3, a guide frame 12 capable of sliding on the bottom plate 10 along the length direction of the push rod is arranged between the two rows of positioning pillars 11, the elastic reset mechanism 5 is a plurality of torsion springs fixed on the guide frame 12, each torsion spring has two free ends, the two free ends are respectively abutted against one corresponding positioning pillar of the two rows of positioning pillars 11, and under the action of the torsion springs, one end of the guide frame 12 is abutted against the outer end of the push rod 4. The reset mechanism with the torsion springs can enable the elastic reset force acting on the guide frame and the push rod to be more balanced, so that the volume proportion change caused by the expansion and contraction effect of the temperature measurement fluid medium is more linear due to the change of the temperature, and the measurement result is more accurate.
As a further preferred embodiment, the bottom plate 10 is provided with a push rod limiting mechanism 13 for limiting the outward sliding of the push rod 4 to a predetermined position and a guide frame limiting mechanism 14 for limiting the outward sliding of the guide frame 12 to a predetermined position. The push rod limiting mechanism 13 and the guide frame limiting mechanism 14 can prevent the push rod 4 from being rushed out of the push rod barrel cavity 3, and safety is guaranteed.
As a further preferred embodiment, the capacitive grating sensor or the magnetic grating sensor each includes a fixed grating sheet 61 and a movable grating sheet 62, the fixed grating sheet 61 is fixed relative to the base plate 10, and the movable grating sheet 62 is fixedly mounted on the guide frame 12. The bottom plate 10 is provided with a housing 15, and the grid positioning sheet 61 is fixed on the inner surface of the housing 15. Therefore, the movable grid piece can move along with the push rod, and when the push rod generates axial displacement, the movable grid piece and the fixed grid piece also generate relative displacement, so that the displacement of the push rod is detected. In addition, the space formed by the outer cover and the bottom plate wraps the container shell, the guide frame, the push rod limiting mechanism, the guide frame limiting mechanism, the torsion spring, the positioning column, the displacement sensor, the temperature conversion module and the like, and the protective effect can be achieved.
As a further preferred embodiment, the container shell 1 is provided with an overflow cylinder chamber 16 with an inner end communicated to the cavity 2 and an outer end communicated to the outside, an overflow piston 17 capable of moving along the axial direction of the overflow cylinder chamber 16 is arranged in the overflow cylinder chamber 16, and the overflow piston 17 is connected with an overflow spring 18 capable of moving the overflow piston 17 inwards. The overflow cylinder cavity is integrally cylindrical, the outer peripheral surface of the overflow piston is in sliding sealing fit with the wall surface of the overflow cylinder cavity, the overflow spring applies certain overflow pressure to the overflow piston, the overflow cylinder cavity, the overflow piston and the overflow spring form an overflow structure, when the temperature of a temperature measurement object exceeds the overflow pressure, redundant temperature measurement fluid media can automatically enter the overflow cylinder cavity and cannot flow out to the outside, the failure of a media container is prevented, and the temperature measurement device is protected.
As a further preferred embodiment, the outer end of the overflow cylinder cavity 16 is connected with an end cover 19 by a thread, the end cover 19 is provided with a guide groove, the overflow piston 17 is fixedly provided with a guide rod 20 penetrating through the guide groove, the overflow spring 18 is sleeved on the guide rod 20, and two ends of the overflow spring 18 are respectively propped between the overflow piston 17 and the end cover 19. In the structure, the position of the end cover in the overflow cylinder cavity can be adjusted by rotating the end cover, so that the elastic force applied to the overflow piston by the overflow spring is adjusted, and the effect of adjusting the overflow pressure is achieved.
As a further preferred embodiment, the inner end of the overflow cylinder chamber 16 is communicated with a section of the push rod cylinder chamber 3 near the outer end. In the structure, only when the temperature of the test object exceeds the limit, the temperature measuring method firstly reaches the maximum range, namely the push rod moves to the outermost end, the overflow cylinder cavity is communicated with the containing cavity through the push rod cylinder cavity to realize the overflow effect, and redundant temperature measuring fluid media can automatically enter the overflow cylinder cavity. Therefore, the influence of the overflow structure on the expansion volume and the contraction volume of the temperature measurement fluid medium when the test object is in a normal test temperature range can be reduced.
As a further preferable embodiment, the inner end of the push rod 4 is provided with a constant pressure air-permeable membrane 21, the inner side surface of the constant pressure air-permeable membrane 21 is in contact with the temperature measurement fluid medium, the constant pressure air-permeable membrane 5 is specifically a polytetrafluoroethylene microporous membrane, and the polytetrafluoroethylene microporous membrane (PTFE membrane) is a microporous membrane made of polytetrafluoroethylene as a raw material by a special process through methods such as rolling, extrusion, biaxial stretching and the like. The PTFE membrane has a fibril-like microporous structure, the porosity is more than 85%, 14 hundred million micropores are formed in each square centimeter, and the pore diameter ranges from 0.02 mu m to 15 mu m. The polytetrafluoroethylene microporous membrane is air permeable but does not allow passage of the temperature measuring fluid medium. And the push rod 4 is provided with a gas guide groove 22 for communicating the outer side surface of the constant-pressure gas-permeable membrane 5 with the outside. Specifically, the inner pot head of push rod 4 be equipped with sliding seal complex sleeve 23 between the wall in push rod barrel chamber 3, the bottom surface of sleeve 23 is provided with air vent 24, constant pressure ventilated membrane 21 sets up on the interior bottom surface of sleeve 23. The constant-pressure air-permeable membrane 21 is in contact with the temperature-measuring fluid medium through the vent hole 24. In order to facilitate the arrangement of the air guide groove, a bearing bush 25 positioned in the sleeve 23 is arranged at the inner end of the push rod 4, the air guide groove 22 is arranged on the bearing bush 25, the position of the air guide groove 22 corresponds to that of the vent hole 24, and the outer diameter of the push rod 4 is smaller than the diameter of the push rod barrel cavity 3. When the temperature measuring fluid medium in the cavity 2 is heated to expand in volume, redundant air in the cavity 2 is compressed, the pressure is increased to be higher than atmospheric pressure, the air is exhausted to the outside along the air guide groove 22 on the bearing bush 25 after passing through the vent hole 24 and the constant-pressure air-permeable film 21, the temperature measuring fluid medium extrudes the sleeve 23, and the sleeve 23 is pressurized to drive the push rod 4 to do linear motion. Therefore, when the temperature is measured, the air sucked in the container cavity can be exhausted, the pressure of the container cavity is kept stable, and the accuracy of the temperature measurement value is kept.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore should not be construed as limiting the scope of the present invention.
In conclusion, although the present invention has been described with reference to the preferred embodiments, it should be noted that, although various changes and modifications may be made by those skilled in the art, they should be included in the scope of the present invention unless they depart from the scope of the present invention.
Claims (6)
1. A temperature measurement method is characterized by comprising the following steps:
s1, placing the temperature-measuring fluid medium in a container, and arranging a liquid level linkage mechanism linked with the liquid level change of the temperature-measuring fluid medium on the container;
s2, converting the liquid level change of the temperature measuring fluid medium caused by thermal expansion and cold contraction into the displacement change of the liquid level linkage mechanism through the liquid level linkage mechanism;
s3, detecting a displacement change value generated by the liquid level linkage mechanism through a displacement sensor;
s4, converting the displacement change value into a corresponding temperature signal and outputting the temperature signal;
the container is provided with a liquid level change cavity which generates reciprocating liquid level change along with temperature measurement fluid medium due to expansion with heat and contraction with cold, and the liquid level linkage mechanism is a reciprocating liquid level linkage mechanism which is linked with the liquid level change in the liquid level change cavity;
the container comprises a container shell, a containing cavity is formed in the container shell, the temperature-measuring fluid medium is placed in the containing cavity, the liquid level change cavity is a push rod barrel cavity arranged on the container shell, the inner end of the push rod barrel cavity is communicated to the containing cavity, the outer end of the push rod barrel cavity is communicated to the outside, the liquid level linkage mechanism comprises an elastic reset mechanism and a push rod which is arranged in the push rod barrel cavity and can move along the axial direction of the push rod barrel cavity, the periphery of the inner end of the push rod is in sliding seal fit with the wall surface of the push rod barrel cavity, and the elastic reset mechanism is connected with the push rod and enables the push;
the container shell is provided with an overflow cylinder cavity, the inner end of the overflow cylinder cavity is communicated with the containing cavity, the outer end of the overflow cylinder cavity is communicated with the outside, an overflow piston capable of axially moving along the overflow cylinder cavity is arranged in the overflow cylinder cavity, and the overflow piston is connected with an overflow spring capable of enabling the overflow piston to inwards move;
the outer end of the overflow cylinder cavity is in threaded connection with an end cover, a guide groove is formed in the end cover, a guide rod penetrating out of the guide groove is fixedly arranged on the overflow piston, the overflow spring is sleeved on the guide rod, and two ends of the overflow spring are respectively propped between the overflow piston and the end cover;
the inner of push rod is provided with the constant voltage ventilated membrane, the medial surface of constant voltage ventilated membrane with the temperature measurement fluid medium contacts, and the constant voltage ventilated membrane specifically is polytetrafluoroethylene micropore film.
2. A method of measuring temperature according to claim 1, wherein: in step S2, the displacement change generated by the liquid level linkage mechanism is an axial displacement change of the push rod, and in step S3, the displacement sensor is used for detecting an axial displacement change value of the push rod.
3. A method of measuring temperature according to claim 2, wherein: in step S4, the axial displacement variation value of the push rod is converted into a corresponding temperature signal by the temperature conversion module connected to the displacement sensor, and the temperature signal is output and displayed by the display module connected to the temperature conversion module.
4. A method of thermometry according to any one of claims 1 to 3, wherein: the displacement sensor is a capacitive grating sensor or a magnetic grating sensor.
5. The method of claim 4, wherein: the capacitive gate sensor is an absolute capacitive gate sensor; or, the grating sensor is an absolute grating sensor; or, the magnetic grid sensor is an absolute magnetic grid sensor.
6. A method of thermometry according to any one of claims 1 to 3, wherein: the container shell is mainly flat hexahedron, and a heat conduction grid is formed inside the container shell.
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