CN110873610A - Device for measuring temperature in equipment cavity - Google Patents
Device for measuring temperature in equipment cavity Download PDFInfo
- Publication number
- CN110873610A CN110873610A CN201811018338.4A CN201811018338A CN110873610A CN 110873610 A CN110873610 A CN 110873610A CN 201811018338 A CN201811018338 A CN 201811018338A CN 110873610 A CN110873610 A CN 110873610A
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- Prior art keywords
- temperature
- measuring
- chamber
- conduit
- cavity
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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
- G01K5/44—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 cylinder and piston
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- 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)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
The invention relates to a device for measuring the temperature in a cavity of equipment, which comprises a temperature measuring element with the characteristics of expansion with heat and contraction with cold, a measuring cylinder and a guide pipe which are positioned outside the cavity of the equipment, a piston which can move in the guide pipe, and a first fixing rod, wherein the first end of the first fixing rod extends into the second end of the guide pipe and is connected with the piston; at least the first end of the temperature measuring element is placed in the equipment chamber, the first end of the conduit is inserted below the liquid level in the measuring cylinder, and the second end of the first fixing rod is connected with the second end of the temperature measuring element. According to the invention, the temperature measuring element deforms when subjected to thermal expansion in the equipment cavity, so that the first fixing rod drives the piston to move in the guide pipe, the pressure in the guide pipe is increased, the water level in the guide pipe is reduced, and then the temperature in the equipment cavity is accurately obtained according to the water level change conditions inside and outside the guide pipe and the functional relation between the deformation quantity of the object and the temperature.
Description
Technical Field
The invention relates to the field of temperature measurement, in particular to a device for measuring the temperature in an equipment cavity.
Background
Currently, devices requiring heating, such as ovens and steam boxes, are becoming important electric appliances in life, and people are more and more interested in making various gourmets by using the devices.
In the process of testing these devices, it is usually necessary to accurately measure the temperature in the cavity of the device while the device is in operation, so as to verify various performance indexes of the device. At present, contact measurement and non-contact measurement are mainly adopted for measuring the temperature in a cavity of equipment. The contact measurement method mainly comprises methods of electric quantity type temperature measurement, photoelectric temperature measurement, thermochromatic temperature measurement and the like; the non-contact temperature measurement method comprises radiation type temperature measurement, spectroscopy temperature measurement and the like.
When a contact measurement method is used for measuring the temperature in the cavity corresponding to the equipment in working, the whole cavity is in a sealed environment in working of the equipment, so that the contact measurement method is difficult to directly and accurately obtain the actual temperature in the cavity of the equipment, and the measurement range of the conventional contact measurement device is difficult to meet the measurement requirement of the temperature in the cavity due to the high temperature in the cavity.
When a non-contact measurement method is adopted to measure the temperature in the corresponding cavity when the equipment works, because the measurement element is not directly positioned in the cavity, the temperature measured by the measurement element has a large error with the actual temperature in the cavity of the equipment, and the measurement result is inaccurate.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a device for measuring the temperature in the equipment chamber, aiming at the above prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a device for measuring the temperature in a chamber of an apparatus, comprising:
the temperature measuring element has the characteristics of expansion with heat and contraction with cold, and at least the first end of the temperature measuring element is placed in the equipment cavity in a temperature measuring state;
the graduated measuring cylinder is positioned outside the cavity of the equipment and is loaded with liquid;
the first end of the conduit is inserted into the measuring cylinder to be below the liquid level of the liquid in the measuring cylinder;
a piston slidably disposed within said conduit adjacent the second end thereof;
and the first end of the first fixed rod extends into the second end of the guide pipe and is connected with the piston, and the second end of the first fixed rod is connected with the second end of the temperature measuring element.
Further, in the device for measuring the temperature in the equipment chamber, the guide pipe is provided with a transverse chamber and a longitudinal chamber which are communicated with each other, the guide pipe is in an inverted L shape, the first end of the guide pipe is positioned in the direction of the longitudinal chamber of the guide pipe, and the piston is positioned in the transverse chamber of the guide pipe.
In the device for measuring the temperature in the equipment cavity, the first end of the temperature measuring element is fixed in the equipment cavity through a second fixing rod.
In a further improvement, in the device for measuring the temperature in the equipment chamber, the first end of the first fixing rod is fixedly connected with the piston.
Further, in the device for measuring the temperature in the equipment chamber, the length of the first fixing rod is greater than or equal to the length of the transverse cavity of the catheter.
In the device for measuring the temperature in the equipment chamber, the guide pipe is provided with a plurality of scales for marking the length.
In the device for measuring the temperature in the equipment cavity, the temperature measuring element is integrally positioned in the equipment cavity, and the device further comprises a fixing sleeve partially covering the outer side wall of the temperature measuring element, and the first end and the second end of the temperature measuring element are not covered by the fixing sleeve.
Compared with the prior art, the invention has the advantages that:
firstly, when the temperature in the equipment cavity is measured, the measuring element is arranged in the equipment cavity, so that the temperature measuring element deforms along the moving direction of the first fixing rod when being heated in the equipment cavity, then the deformation generated when the temperature measuring element expands due to heating is utilized to drive the piston to move in the guide pipe through the first fixing rod, and finally the temperature in the equipment cavity is accurately obtained according to the water level change conditions inside and outside the guide pipe and the functional relation between the deformation of the object and the temperature. Because the temperature measuring element is positioned in the equipment cavity, the temperature measuring element can be directly influenced by the change of the temperature in the equipment cavity in real time, so that the obtained temperature in the equipment cavity is more accurate;
moreover, the outer side wall of the temperature measuring element is partially coated by the fixing sleeve, and both ends of the temperature measuring element are not coated by the fixing sleeve, so that the movement stability of the temperature measuring element in the moving direction of the first fixing rod is further ensured, and the subsequent temperature measuring accuracy is improved;
secondly, the deformation of the temperature measuring element generated when the temperature measuring element is heated and expanded can be displayed through the movement change of the piston in the guide pipe and the water level change inside and outside the guide pipe; once the temperature in the equipment cavity rises faster, the movement amount of the piston and the water level change speed inside and outside the guide pipe are more obvious, so that the temperature rising and falling conditions in the equipment cavity can be more intuitively reflected by the movement change of the piston and the water level change in the guide pipe;
thirdly, the measuring device can also be applied to the temperature measurement of other closed chambers, so that the application range of the measuring device is greatly expanded;
in addition, as long as the first fixing rod and the guide pipe with enough length are arranged, the requirement for measuring the ambient temperature of the cavity with a larger temperature change range can be met, so that the measuring range of the measuring device is effectively increased;
finally, because each part adopted by the measuring device is low in price, the whole measuring process is simple and easy to operate, and the measured data is accurate, the cost performance of the temperature measuring device for the temperature in the equipment chamber is greatly improved.
Drawings
FIG. 1 is a schematic view of the arrangement between the measuring device and the oven in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the state of the measurement device in this embodiment when the measurement device starts to measure the temperature in the oven cavity;
fig. 3 is an enlarged view of a portion a in fig. 2.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the present embodiment takes the temperature measurement in the oven cavity as an example, and the measurement device in the present invention is explained. Specifically, the measuring device in this embodiment includes:
the temperature measuring element 1 has the characteristics of expansion with heat and contraction with cold, and at least the first end of the temperature measuring element is placed in the oven cavity in a temperature measuring state;
a graduated cylinder 3 located outside the oven cavity 7 and carrying a liquid; wherein the liquid in this embodiment is water;
a conduit 4 located outside the oven cavity 7, a first end of the conduit 4 being inserted into the measuring cylinder 3 to below the level of the liquid in the measuring cylinder;
a piston 5 slidably disposed within the conduit 4 and adjacent the second end of the conduit 4;
and a first end of the first fixing rod 6 extends into the second end of the conduit 4 and is connected with the piston 5, and a second end of the first fixing rod 6 is connected with a second end of the temperature measuring element 1. In this embodiment, the first end of the first fixing rod 6 is fixedly connected to the piston 5.
Of course, in order to allow the temperature measuring element to be securely placed in the oven cavity, the first end of the temperature measuring element 1 is fixed in the oven cavity by the second fixing lever 9.
In order to facilitate the piston to move along the inner cavity of the catheter under the action of the first fixing rod, the catheter 4 in the embodiment has a transverse cavity and a longitudinal cavity which are communicated with each other, the catheter is in an inverted L shape, the first end of the catheter 4 is located in the direction of the longitudinal cavity of the catheter, and the piston 5 is located in the transverse cavity of the catheter 4. Of course, the catheter 4 of this embodiment has several length-marked scales on it, for example on the outer or inner side wall of the catheter, which are preferably located on the outer side wall of the catheter 4.
Of course, the temperature measuring element 1 in this embodiment may be located in the oven cavity 7 as a whole, and further includes a fixing sleeve 2 partially covering the outer side wall of the temperature measuring element, and both the first end and the second end of the temperature measuring element 1 are not covered by the fixing sleeve 2. Therefore, the movement stability of the temperature measuring element 1 in the moving direction of the first fixing rod can be further ensured, and the subsequent temperature measuring accuracy is improved.
The following description will be made with reference to fig. 1 to 3 for the working principle of measuring the temperature in the oven cavity by using the measuring device of the present embodiment:
when the oven 8 works, after the temperature in the oven cavity 7 rises to a stable state, the temperature measuring element 1 expands due to the temperature rise;
the temperature measuring element 1 expanded by heat can deform along the direction of the first fixing rod 6, and then the expanded temperature measuring element 1 generates a thrust F through the first fixing rod 60To push the piston 5 in the conduit along the force F0Is moved;
due to the movement of the piston 5, the air inside the conduit 4 is compressed, which in turn causes an increase in the pressure inside the lumen of the conduit between the piston 5 and the first end of the conduit;
after the pressure has increased, the air in the conduit 4 will exert a force F at the increased pressure0The water level in the conduit is pressed down, and the water level outside the conduit (namely the water level in the measuring cylinder 3) is raised, thereby achieving the effect that the internal and external water levels of the conduit are changed due to the thermal expansion of the temperature measuring element. The calculation process for the temperature inside the oven cavity 7 is as follows:
it is assumed that the cross-sectional area of the measuring cylinder 3 is marked SMeasuring cylinderThe cross-sectional area of the conduit 4 is SCatheter tube(ii) a The water level rise of the measuring cylinder 3 (i.e. the water level rise outside the conduit) is marked h1The water level drop in the conduit is marked as h2The initial water level in the measuring cylinder 3 is marked as h; according to the premise that the total volume of water in the whole measuring device is not changed before and after the temperature measuring element is heated and deformed, the following steps can be obtained:
Scatheter tube·(h-h2)+(SMeasuring cylinder-SCatheter tube)·(h+h1)＝SMeasuring cylinder·h；
Since the measuring cylinder 3 is provided with scales h1For data which can be read directly by means of a scale on the measuring cylinder, i.e. h1Is a known quantity, and thus the difference between the water levels inside and outside the conduit 4 can be obtained, wherein the difference between the water levels inside and outside the conduit 4 is marked as △ h,
further, the pressure F generated by the increased pressure in the conduit can be obtained0Size:
F0＝ρwater (W)g△h·SCatheter tube＝ρWater (W)gh1·SMeasuring cylinder；
Where ρ isWater (W)G is the gravity acceleration of the position of the measuring device, and is the water density in the measuring cylinder 3;
due to the inherent properties of the temperature sensing element, at pressure F0Under the action of the force F, the temperature measuring element0Amount of deformation in the direction L1With the force F0Satisfies the known functional relationship L (F), namely L1＝L(F0) (ii) a When the temperature of the temperature measuring element changes, the temperature in the oven cavity 7 is assumed to be t1Temperature t1The deformation L of the temperature measuring element caused by expansion with heat and contraction with cold2Satisfies a known functional relationship L (t), namely L2＝L(t1)；
The total deformation of the temperature measuring element 1 is △ L, △ L because the movement distance of the piston 5 in the guide tube 4 is the total deformation of the temperature measuring element2-L1＝L(t1)-L(F0) Thereby obtaining L (t)1)＝△L+L(F0)；
Due to the pressure L (F)0) Can be based on the existing formula F0＝ρWater (W)gh1·SMeasuring cylinderIs directly obtained, i.e. the pressure F0A known quantity, a value L (F) obtained according to the functional relationship L (F)0) The total deformation △ L of the temperature measuring element 1 can be directly read through the scales on the catheter 4 (or measured by a measuring tool), namely △ L is also a known quantity;
thus, in the formula L (t)1)＝△L+L(F0) Middle, value △ L and value L (F)0) Are all known quantities, by solving the equation L (t)1)＝△L+L(F0) The temperature value t in the oven cavity 7 can be obtained1＝L-1(△L+L(F0)). Wherein L is-1(△L+L(F0) Express the logarithmic value △ L + L (F) according to the functional formula L (t)0) And (5) performing inverse calculation.
In addition, when the oven works normally, the temperature in the cavity of the oven is difficult to accurately estimate, so the length of the first fixing rod 6 is set to be greater than or equal to the length of the transverse cavity of the guide pipe 4 in the embodiment. Therefore, the piston 5 can move in the guide pipe for a large distance due to the expansion deformation of the temperature measuring element in a large degree caused by heating.
Of course, the measuring device in this embodiment can also be applied to other devices requiring the measurement of the temperature in the chamber.
Claims (7)
1. A device for measuring the temperature in a chamber of an apparatus, comprising:
the temperature measuring element (1) has the characteristics of expansion with heat and contraction with cold, and at least the first end of the temperature measuring element (1) is placed in the equipment cavity in a temperature measuring state;
a graduated measuring cylinder (3) which is positioned outside the chamber of the equipment and is loaded with liquid;
the conduit (4) is positioned outside the cavity of the equipment, and the first end of the conduit (4) is inserted into the measuring cylinder (3) to be below the liquid level of the liquid in the measuring cylinder;
a piston (5) slidably disposed within said conduit (4) and adjacent to the second end of the conduit (4);
and the first end of the first fixing rod (6) extends into the second end of the guide pipe (4) and is connected with the piston (5), and the second end of the first fixing rod (6) is connected with the second end of the temperature measuring element (1).
2. The device for measuring the temperature in the equipment chamber according to claim 1, wherein the conduit (4) has a transverse chamber and a longitudinal chamber which are communicated with each other, and the conduit is in an inverted L shape, the first end of the conduit (4) is located in the direction of the longitudinal chamber of the conduit, and the piston (5) is located in the transverse chamber of the conduit (4).
3. The apparatus for measuring the temperature in a chamber of an apparatus according to claim 1, wherein the first end of the temperature measuring element (1) is fixed in the chamber of the apparatus by a second fixing rod (9).
4. Device for measuring the temperature in the chamber of an apparatus according to claim 1, characterized in that the first end of the first fixing rod (6) is fixedly connected to the piston (5).
5. Device for measuring the temperature inside the chamber of an apparatus according to claim 2, characterized in that the length of said first fixing bar (6) is greater than or equal to the length of the transversal cavity of said catheter (4).
6. Device for measuring the temperature in the chamber of an apparatus according to any of claims 1 to 5, characterized in that the conduit (4) is provided with a plurality of scales marking the length.
7. The device for measuring the temperature in the equipment chamber according to any one of claims 1 to 5, wherein the temperature measuring element (1) is entirely located in the equipment chamber, and further comprises a fixing sleeve (2) partially covering the outer side wall of the temperature measuring element (1), and the first end and the second end of the temperature measuring element (1) are not covered by the fixing sleeve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811018338.4A CN110873610A (en) | 2018-09-03 | 2018-09-03 | Device for measuring temperature in equipment cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811018338.4A CN110873610A (en) | 2018-09-03 | 2018-09-03 | Device for measuring temperature in equipment cavity |
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| Publication Number | Publication Date |
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| CN110873610A true CN110873610A (en) | 2020-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811018338.4A Pending CN110873610A (en) | 2018-09-03 | 2018-09-03 | Device for measuring temperature in equipment cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928123A (en) * | 2020-07-22 | 2020-11-13 | 东营市乾润石油工程技术服务有限责任公司 | Telescopic sign board |
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| CN207437062U (en) * | 2017-11-28 | 2018-06-01 | 陕西晟大钻探科技有限公司 | A kind of oil reservoir logging dynamic monitor |
| CN207445664U (en) * | 2017-11-15 | 2018-06-05 | 陕西森弗天然制品有限公司 | Temperature monitoring device in a kind of Cordyceps militaris extract extraction process |
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2018
- 2018-09-03 CN CN201811018338.4A patent/CN110873610A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010082787A (en) * | 2000-02-21 | 2001-08-31 | 유현식 | Method for measuring the polymer sintering temperature using TMA-Dilatometer |
| CN2490822Y (en) * | 2000-04-03 | 2002-05-15 | 李沂清 | High sensitive gas-liquid thermometer for vegetable greenhouse |
| CN2478089Y (en) * | 2001-05-30 | 2002-02-20 | 姜树芳 | Long-range thermo detector |
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| CN104111125A (en) * | 2014-08-05 | 2014-10-22 | 苏州路之遥科技股份有限公司 | Temperature sensor and temperature regulator |
| CN207445664U (en) * | 2017-11-15 | 2018-06-05 | 陕西森弗天然制品有限公司 | Temperature monitoring device in a kind of Cordyceps militaris extract extraction process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928123A (en) * | 2020-07-22 | 2020-11-13 | 东营市乾润石油工程技术服务有限责任公司 | Telescopic sign board |
| CN111928123B (en) * | 2020-07-22 | 2022-03-18 | 东营市乾润石油工程技术服务有限责任公司 | Telescopic sign board |
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Application publication date: 20200310 |
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