CN215492121U

CN215492121U - Indirect temperature thermocouple

Info

Publication number: CN215492121U
Application number: CN202121348711.XU
Authority: CN
Inventors: 文东海; 杨亚斐; 徐伟; 李渝东
Original assignee: Chongqing Nanpaike Instrument Technology Co ltd
Current assignee: Chongqing Nanpaike Instrument Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-01-11
Anticipated expiration: 2031-06-17

Abstract

The utility model particularly discloses an indirect temperature measuring thermocouple, which comprises a fixed seat, a mounting base, a sheath, a thermosensitive element, a thermocouple, a compensation lead and a stainless steel pipe, wherein the fixed seat is fixedly arranged on the mounting base; the center of the fixed seat is provided with a through hole along the length direction; one end of the fixed seat is provided with an external thread, and the other end is provided with an internal thread; the fixed seat is connected with the sheath through threads; the fixed seat is connected with the stainless steel pipe through threads; the mounting base is fixedly connected with the sheath; the thermosensitive element is fixedly connected with the mounting base; the thermocouple penetrates through the stainless steel pipe and the through hole of the fixed seat; one end of the thermocouple extends out of the through hole of the fixed seat and is welded with the thermosensitive element, and the other end of the thermocouple is welded with the compensation lead to lead out the stainless steel tube; a corundum core is filled in the through hole of the fixing seat; the stainless steel tube is filled with epoxy. The utility model indirectly measures the real temperature of the inner cavity of the engine by calculating the heat conductivity coefficient of iron and the heat conductivity coefficient of copper.

Description

Indirect temperature thermocouple

Technical Field

The utility model belongs to the technical field of thermocouples, and particularly relates to an indirect temperature measuring thermocouple.

Background

The thermocouple (thermocouple) is a commonly used temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument (secondary instrument).

The basic principle of thermocouple temperature measurement is that two material conductors with different components form a closed loop, when temperature gradients exist at two ends, current passes through the loop, and electromotive force, namely thermoelectric force, exists between the two ends, so-called Seebeck effect (Seebeck effect). The homogeneous conductors of the two different compositions are hot electrodes, the end with the higher temperature being the working end and the end with the lower temperature being the free end, which is usually at some constant temperature. According to the functional relation between the thermoelectromotive force and the temperature, a thermocouple graduation table is manufactured; the scores were obtained at a free end temperature of 0 ℃ with different thermocouples having different scores.

The compensating lead is a pair of insulated leads having the same nominal value as the thermoelectromotive force of the matched thermocouple in a certain temperature range (0-100 ℃), and the thermocouple and the measuring device are connected by the insulated leads so as to compensate the error generated by the temperature change at the connection part of the thermocouple and the thermocouple. A special wire for extending the cold end of thermocouple to the place far from high temp. and where its temp. is stable.

The existing thermocouple can generally test the temperature within the range of-200 ℃ to 1300 ℃, while the temperature of an inner cavity of an engine can reach 3000 ℃, and the existing thermocouple can not directly test the temperature of 3000 ℃.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an indirect temperature thermocouple which can directly test the high temperature of 3000 ℃ so as to solve the problem that the existing ordinary thermocouple cannot directly test the ultrahigh temperature, such as the high temperature in an engine cavity.

In order to achieve the purpose, the technical scheme of the utility model is as follows: an indirect temperature thermocouple comprises a fixed seat, a mounting base, a sheath, a thermosensitive element, a thermocouple, a compensation lead and a stainless steel tube;

the center of the fixed seat is provided with a through hole along the length direction; one end of the fixed seat is provided with an external thread, and the other end of the fixed seat is provided with an internal thread; the sheath is provided with an internal thread matched with the external thread of the fixed seat; one end of the stainless steel pipe is provided with an external thread matched with the internal thread of the fixed seat; the fixed seat is connected with the sheath through threads; the fixed seat is connected with the stainless steel pipe through threads;

the sheath is also provided with a first bayonet matched with the mounting base; the mounting base is fixedly connected with the sheath through the first bayonet; a second bayonet matched with the thermosensitive element is formed in the mounting base; the thermosensitive element is fixedly connected with the mounting base through the second bayonet;

the thermocouple penetrates through the stainless steel pipe and the through hole of the fixed seat; one end of the thermocouple extends out of the through hole of the fixed seat and is welded with the thermosensitive element, and the other end of the thermocouple is welded with the compensation lead to lead out of the stainless steel pipe; a corundum core is filled in the through hole of the fixing seat; and epoxy is filled in the stainless steel tube.

Further, the thermocouple graduation number is T graduation.

Further, the thermosensitive element is a carbon steel measuring piece of 0.5mm or a brass measuring piece of 0.5 mm.

Further, the diameter of the stainless steel pipe is 8 mm; the diameter of the through hole of the fixed seat is 4 mm; the diameter of the internal thread of the fixed seat is 8mm, and the depth of the internal thread of the fixed seat is 10 mm; the external screw thread diameter of fixing base is 20mm, and is highly 12 mm.

Further, the first bayonet is a round hole with the diameter of 17 mm.

Further, the second bayonet is a round hole, and the diameter of the second bayonet is 8.5 mm.

Further, the mounting base is made of polyimide.

The working principle of the technical scheme is as follows: the actual temperature of the inner cavity of the engine is indirectly measured by calculating the heat conductivity coefficient of iron and the heat conductivity coefficient of copper.

The beneficial effects of this technical scheme lie in: high temperature tests up to 3000 ℃ can be directly performed.

Drawings

FIG. 1 is a schematic structural diagram of an indirect temperature thermocouple of the present invention;

FIG. 2 is a schematic structural view of a fixing base of an indirect temperature thermocouple according to the present invention;

FIG. 3 is a schematic structural diagram of a sheath of an indirect temperature thermocouple of the present invention;

FIG. 4 is a schematic structural diagram of a mounting base of an indirect temperature thermocouple according to the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: 1. a fixed seat; 2. mounting a base; 21. a second bayonet; 3. a sheath; 31. a first bayonet; 4. a thermosensitive element; 5. a thermocouple; 6. a compensation wire; 7. a stainless steel tube; 8. a corundum core; 9. and (4) epoxy.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiments are substantially as shown in figures 1 to 4 of the accompanying drawings: an indirect temperature thermocouple comprises a fixed seat 1, a mounting base 2, a sheath 3, a thermosensitive element 4, a thermocouple 6, a compensation lead 6 and a stainless steel tube 7; the center of the fixed seat 1 is provided with a through hole along the length direction; one end of the fixed seat 1 is provided with an external thread, and the other end is provided with an internal thread; the sheath 3 is provided with an internal thread matched with the external thread of the fixed seat 1; one end of the stainless steel tube 7 is provided with an external thread matched with the internal thread of the fixed seat 1; the fixed seat 1 is connected with the sheath 3 through threads; the fixed seat 1 is connected with the stainless steel pipe 7 through threads; the sheath 3 is also provided with a first bayonet 31 matched with the mounting base 2; the mounting base 2 is fixedly connected with the sheath 3 through a first bayonet 31; a second bayonet 21 matched with the thermosensitive element 4 is arranged on the mounting base 2; the thermosensitive element 4 is fixedly connected with the mounting base 2 through a second bayonet 31; the upper and lower surfaces of the thermosensitive element 4 should be kept clean and tidy, and other impurities cannot be adhered; the fixed seat 1, the mounting base 2 and the thermosensitive element 4 enclose a cavity; the thermocouple 5 penetrates through the stainless steel pipe 7 and the through hole of the fixed seat 1; one end of the thermocouple 5 extends out of the through hole of the fixed seat 1 and is welded with the thermosensitive element 4, the other end of the thermocouple is welded with the compensation lead 6 to lead out a stainless steel tube 7, and the length of the compensation lead 6 is two meters; the corundum core 8 is filled in the through hole of the fixed seat 1 to keep insulation; the stainless steel tube 7 is filled with epoxy 9.

Specifically, the thermocouple 5 is indexed by T; the thermosensitive element 4 is a carbon steel measuring piece of 0.5mm or a brass measuring piece of 0.5 mm; the diameter of the stainless steel tube 7 is 8 mm; the diameter of the through hole of the fixed seat 1 is 4 mm; the diameter of the internal thread of the fixed seat 1 is 8mm, and the depth is 10 mm; the diameter of the external thread of the fixed seat 1 is 20mm, and the height of the external thread is 12 mm; the first bayonet 31 is a round hole with the diameter of 17 mm; the second bayonet 21 is a round hole with the diameter of 8.5 mm; the mounting base 2 is made of polyimide, which has the characteristics of high temperature resistance and good insulation.

The thermocouple of the utility model has the graduation number of T graduation, the anode of the thermocouple is pure copper (TP), and the cathode of the thermocouple is copper-nickel alloy (TN, constantan). The main characteristics are that in the cheap metal thermocouple, its accuracy is highest and the uniformity of the thermal wire is good. The shape of fixing base can carry out the field design according to the demand of difference, and nonrust steel pipe is inside to be sealed up with the epoxy, adds the fixed glue between the screw thread when sheath and fixing base fastening, makes fixing base and sheath become whole, and later stage is undetachable. Because the temperature of the inner cavity of the engine can reach 3000 ℃, the common thermocouple cannot be directly tested, the indirect temperature measuring thermocouple provided by the utility model mainly utilizes the heat conductivity coefficient of iron and the heat conductivity coefficient of copper to indirectly measure the real temperature of the inner cavity of the engine through calculation.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. An indirect temperature thermocouple, characterized in that: comprises a fixed seat, a mounting base, a sheath, a thermosensitive element, a thermocouple, a compensation lead and a stainless steel pipe;

2. An indirect thermometric thermocouple according to claim 1, wherein: the thermocouple graduation number is T graduation.

3. An indirect thermometric thermocouple according to claim 1, wherein: the thermosensitive element is a carbon steel measuring sheet with the thickness of 0.5mm or a brass measuring sheet with the thickness of 0.5 mm.

4. An indirect thermometric thermocouple according to claim 1, wherein: the diameter of the stainless steel pipe is 8 mm; the diameter of the through hole of the fixed seat is 4 mm; the diameter of the internal thread of the fixed seat is 8mm, and the depth of the internal thread of the fixed seat is 10 mm; the external screw thread diameter of fixing base is 20mm, and is highly 12 mm.

5. An indirect thermometric thermocouple according to claim 1, wherein: the first bayonet is a round hole with the diameter of 17 mm.

6. An indirect thermometric thermocouple according to claim 1, wherein: the second bayonet is a round hole, and the diameter is 8.5 mm.

7. An indirect thermometric thermocouple according to claim 1, wherein: the mounting base is made of polyimide.