CN111707390A - Multi-point temperature measuring rod for inner wall of hollow circular tube test piece and temperature measuring method thereof - Google Patents
Multi-point temperature measuring rod for inner wall of hollow circular tube test piece and temperature measuring method thereof Download PDFInfo
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- CN111707390A CN111707390A CN202010756847.8A CN202010756847A CN111707390A CN 111707390 A CN111707390 A CN 111707390A CN 202010756847 A CN202010756847 A CN 202010756847A CN 111707390 A CN111707390 A CN 111707390A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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Abstract
The disclosure provides a multi-point temperature measuring rod for the inner wall of a hollow circular tube test piece and a temperature measuring method thereof; the measuring rod comprises a rod body, a plurality of spring pieces and a plurality of temperature measuring elements; the spring pieces are arranged on the rod wall of the rod body and are distributed along the circumferential direction of the rod body; the spring plate is provided with raised peak parts which can be sprung up and down, and each temperature measuring element is correspondingly arranged on the peak part of one spring plate. The method for measuring the multipoint temperature of the inner wall of the hollow circular tube test piece comprises the following steps: inserting the measuring rod into a hollow circular tube test piece, and enabling all the temperature measuring elements to be in contact with the inner wall of the hollow circular tube test piece; at the moment, the spring piece is extruded by the inner wall of the hollow circular tube test piece to generate flexible deformation, the spring piece generates certain elastic force, the temperature measuring element is in close contact with the inner wall of the hollow circular tube test piece, and multi-point temperature measurement of the inner wall of the hollow circular tube test piece is achieved.
Description
Technical Field
The disclosure relates to temperature measurement of a hollow circular tube, in particular to a multipoint temperature measuring rod for an inner wall of a hollow circular tube test piece and a temperature measuring method thereof.
Background
The turbine blades of aircraft engines are subjected to alternating thermal and mechanical loads, and the thermal mechanical fatigue caused by the superposition of temperature and strain cycles is the main failure mode. The thermomechanical fatigue test based on the material standard test piece is a main means for recognizing the mechanical behavior of the turbine blade in service at present, and has important significance for the service life evaluation, the fault analysis and the like of the turbine blade. Compared with common solid round bar test pieces, solid rectangular section test pieces and the like, the hollow round tube test pieces can obtain faster heating/cooling rate, shorten the cycle time and have better temperature uniformity, and are in the form of material thermal mechanical fatigue test pieces recommended by I SO, European Union, America and national standard making organizations.
In the thermomechanical fatigue test process, in order to realize rapid temperature cycling, high-frequency electromagnetic induction heating is generally adopted, and certain temperature gradients are inevitably generated in the radial direction and the circumferential direction of a test piece. The temperature gradient can generate additional thermal stress on the cross section of the test piece, so that the cross section of the test piece generates an uneven stress field, deviates from a target value, and further influences the accuracy and the effectiveness of a test result. Therefore, it is necessary to perform multi-point measurement of the temperature of the inner wall of the hollow circular tube test piece to evaluate the influence of the radial and circumferential temperature gradients.
When the thermocouple is used for measuring temperature, the thermocouple is ensured to be in good contact with a test piece all the time in the test process, otherwise, temperature measurement errors can be generated, and the method is particularly obvious when induction heating is used. For high-temperature tests of materials of hot end parts of aero-engines adopting induction heating, a welding or pocket connection method is generally adopted to ensure that a thermocouple is in close contact with a test piece. The welding method is to directly weld the thermocouple on the surface of the test piece, and the instantaneous high temperature generated in the welding process inevitably causes initial damage to the surface of the test piece, possibly causes the test piece to fail at a welding point, and the welding point is easy to fall off when bearing thermal mechanical fatigue load, thus causing test failure. For a hollow circular tube test piece, the test piece is usually long and narrow, the inner diameter is small, the technical difficulty of directly welding a temperature thermocouple on the inner wall of the test piece examination section is overlarge, the welding quality is not easy to guarantee, and the feasibility and the measurement precision of temperature measurement are seriously influenced. The pocket connection method is characterized in that a thermocouple measuring point is tightly pressed on the surface of a test piece by using a high-temperature resistant metal wire, and two ends of the metal wire are tensioned by two springs, so that the damage to the surface of the test piece is avoided, and the pocket connection method is a temperature measuring mode recommended in the industry at present. However, the pocket connection method can only fix the thermocouple on the convex surface of the test piece, and is not suitable for measuring the temperature of the inner wall of the hollow circular tube test piece.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present disclosure provides a hollow round tube test piece inner wall multipoint temperature measuring rod and a temperature measuring method thereof, and the specific implementation manner is as follows:
a multi-point temperature measuring rod for the inner wall of a hollow circular tube test piece comprises a rod body, a plurality of spring pieces and a plurality of temperature measuring elements; the spring pieces are arranged on the rod wall of the rod body and are distributed along the circumferential direction of the rod body;
the spring plate is provided with raised peak parts which can be sprung up and down, and each temperature measuring element is correspondingly arranged on the peak part of one spring plate.
Further, the spring plate still includes: a fixed end located on one side of the peak and a moving end located on the other side of the peak; the fixed end with the body of rod is fixed continuous, remove the end and can follow the body of rod axial slip.
Furthermore, a plurality of shallow grooves are concavely formed in the rod wall of the rod body, and each spring piece is correspondingly arranged in one shallow groove.
Further, the stiff end is straight plate body, the slip end includes an arc portion, the arc portion contradicts in the pole wall of the body of rod.
Furthermore, the groove bottom of the shallow groove is a plane.
Furthermore, one end of the rod body is connected with a boss.
Furthermore, the number of the spring pieces is four, and the number of the temperature measuring elements is four; the four spring pieces are evenly distributed along the circumferential direction of the rod body at intervals.
A multi-point temperature measuring method for the inner wall of a hollow circular tube test piece comprises the following steps:
s1, inserting any one of the measuring rods into a hollow circular tube test piece, and enabling all the temperature measuring elements to be in contact with the inner wall of the hollow circular tube test piece;
and S2, the temperature measuring element obtains the temperature of the contact point of the inner wall of the hollow circular tube test piece.
Further, before the measuring rod is inserted into the hollow circular tube test piece, an annular groove is machined in the inner edge of one port of the hollow circular tube test piece;
and after the measuring rod is inserted into the hollow circular tube test piece, a boss connected with one end of the measuring rod is embedded in the annular groove.
Furthermore, the hollow circular tube test piece comprises two clamping sections and an examination section located between the two clamping ends, and when the measuring rod is inserted into the hollow circular tube test piece, the temperature measuring element is located in the examination section.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic structural view of a measurement bar of the present disclosure;
FIG. 2 is a front view schematic of a measurement stick of the present disclosure;
FIG. 3 is a schematic view of the cross-sectional structure taken along the line B-B in FIG. 2;
FIG. 4 is a schematic view of a spring plate according to the present disclosure;
FIG. 5 is a front view of the spring plate of the present disclosure;
FIG. 6 is a schematic view of the spring plate with a temperature measuring element mounted thereon according to the present disclosure;
FIG. 7 is a schematic structural view of a hollow round tube test piece of the present disclosure;
FIG. 8 is a schematic cross-sectional view of the assembled test rod and hollow round tube test piece of the present disclosure;
fig. 9 is a partially enlarged schematic view at a in fig. 8.
The device comprises a hollow circular tube test piece 1, a measuring rod 2, a spring piece 3, a temperature measuring element 4, a rod body 21, a boss 22 and a groove 11.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
Referring to fig. 1-6 and 8, the embodiment provides a multi-point temperature measuring rod 2 on the inner wall of a hollow circular tube test piece 1, which comprises a rod body 21, a plurality of spring pieces 3 and a plurality of temperature measuring elements 4; the spring pieces 3 are arranged on the rod wall of the rod body 21 and are distributed along the circumferential direction of the rod body 21; according to the requirement of actual temperature measurement, a plurality of spring pieces 3 can be uniformly distributed or distributed at certain intervals; the spring plate 3 has raised peaks which can be sprung up and down, and each temperature measuring element 4 is mounted on the peak of one of the spring plates 3.
This embodiment is through with temperature element 4 install in the peak of spring leaf 3, when the peak receives down extrusion, can produce ascending elasticity for temperature element 4 can hug closely in the inner wall of the hollow pipe test piece 1 of measurationing, prevents not hard up, when guaranteeing the temperature measurement, temperature element 4 with hollow pipe test piece 1 inner wall has reliable contact, improves the stability and the reliability of temperature measurement.
In this embodiment, a plurality of the spring pieces 3 are mounted on the wall of the rod body 21 and distributed along the circumferential direction of the rod body 21, and each of the spring pieces 3 is provided with one of the temperature measuring elements 4, so that the temperature measuring elements 4 can measure the temperatures of different circumferential positions of the inner wall of the hollow circular tube test piece 1 at the same time.
In this embodiment, the number of the spring pieces 3 and the temperature measuring elements 4 can be determined according to temperature measuring points required to be set, for example, when there are four temperature measuring points, the number of the spring pieces 3 is four, and the number of the temperature measuring elements 4 is four; the four spring pieces 3 are evenly distributed along the circumferential direction of the rod body 21 at intervals.
In the present embodiment, the temperature measuring element 4 is preferably a thermocouple. The thermocouple may be fixedly mounted to the peak of the spring plate 3 through a welding process.
In this embodiment, the rod wall of the rod body 21 is concavely provided with a plurality of shallow grooves, and each spring plate 3 is correspondingly installed in one of the shallow grooves. The groove bottom of the shallow groove is a plane. In the embodiment, the shallow grooves are formed in the rod wall of the rod body 21 and used for mounting the spring piece 3, so that the position of the spring piece 3 is relatively fixed, and the spring piece 3 is connected with the rod body 21 more firmly.
In order to facilitate the connection between the spring plate 3 and the rod 21, the spring plate 3 further includes: the fixing end is positioned on one side of the peak and fixedly connected with the rod body 21, and in the embodiment, the spring piece 3 is arranged in the shallow groove, the groove bottom of the shallow groove is a plane, so that the fixing end of the spring piece 3 can be tightly attached to the groove bottom of the shallow groove, the installation is more stable, and the fixing end is made into a straight plate body. It should be noted that, the above is only an embodiment, when the bottom of the shallow groove is a cambered surface, the fixing end may also be made into a plate body with a cambered surface, so that the fixing end can be attached to the bottom of the shallow groove.
The spring plate 3 further includes: a moving end located on the other side of the peak; the moving end can slide axially along the rod body 21. In order to reduce the sliding friction force and reduce the damage of the sliding to the rod body 21, in this embodiment, the sliding end includes an arc portion, and the arc portion abuts against the rod wall of the rod body 21.
Referring to fig. 1 and 8, in the present embodiment, a boss 22 is connected to one end of the rod body 21. The boss 22 can prevent the measuring rod 2 from completely entering the hollow circular tube test piece 1, so that the position of the temperature measuring element 4 cannot be determined, and the limiting and positioning effects are achieved.
Example two
Referring to fig. 1 to 9, the present embodiment provides a method for measuring multi-point temperature of an inner wall of a hollow circular tube test piece 1, including the following steps:
s1, inserting the measuring rod 2 into the hollow circular tube test piece 1, and bringing all the temperature measuring elements 4 into contact with the inner wall of the hollow circular tube test piece 1; at the moment, the spring piece 3 is extruded by the inner wall of the hollow circular tube test piece 1 to generate flexible deformation, the spring piece 3 generates certain elastic force, and the temperature measuring element 4 is in close contact with the inner wall of the hollow circular tube test piece 1, so that the multipoint temperature measurement of the inner wall of the hollow circular tube test piece 1 is realized.
And S2, the temperature measuring element obtains the temperature of the contact point of the inner wall of the hollow circular tube test piece.
The hollow circular tube test piece 1 comprises two clamping sections and an examination section located between the two clamping ends, and when the measuring rod 2 is inserted into the hollow circular tube test piece 1, the temperature measuring element 4 is located in the examination section. Before the measuring rod 2 is inserted into the hollow circular tube test piece 1, an annular groove 11 is machined in the inner edge of one port of the hollow circular tube test piece 1; after the measuring rod 2 is inserted into the hollow circular tube test piece 1, the boss 22 connected with one end of the measuring rod 2 is embedded in the annular groove 11 to play a role in positioning and limiting, and at the moment, the temperature measuring element 4 is just positioned in the examination section.
EXAMPLE III
Referring to fig. 1 to 9, the present embodiment is further described based on the first embodiment and the second embodiment.
In this embodiment, four temperature measurement points are taken as an example, at this time, the number of the spring pieces 3 and the number of the temperature measurement elements 4 are four, and the inner diameter of the hollow circular tube test piece 1 is D. One end of the measuring rod 2 is connected with a boss 22, the boss 22 is matched with the groove 11 at one port of the hollow circular tube test piece 1, the diameter of the rod body 21 of the measuring rod 2 is D, and D is smaller than D.
Four rectangular flat-bottom shallow grooves which are uniformly distributed in the circumferential direction are machined in the middle upper portion of the rod body 21 of the measuring rod 2 and used for mounting the spring piece 3, and the axial length of each shallow groove is A. The fixed end of the spring piece 3 is installed in the shallow groove through welding, the radial total height of the measuring rod 2, the spring piece 3 and the temperature measuring element 4 is H, and H is larger than D.
And (3) installing the measuring rod 2 into the hollow circular tube test piece 1 until the boss 22 of the measuring rod 2 is embedded in the groove 11 of the hollow circular tube test piece 1, and completing the assembly of the measuring rod 2 and the hollow circular tube test piece 1.
And H is more than D, so that all the spring pieces 3 are extruded by the inner wall of the hollow circular tube test piece 1 to generate flexible deformation, the length of the deformed spring pieces 3 is L, and L is less than A. In this embodiment, the four temperature measuring elements 4 are respectively pressed by the four spring pieces 3 at different circumferential positions of the inner wall of the test piece, so that the temperature of four points of the inner wall temperature can be measured simultaneously.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (10)
1. A multi-point temperature measuring rod for the inner wall of a hollow circular tube test piece is characterized by comprising a rod body, a plurality of spring pieces and a plurality of temperature measuring elements; the spring pieces are arranged on the rod wall of the rod body and are distributed along the circumferential direction of the rod body;
the spring plate is provided with raised peak parts which can be sprung up and down, and each temperature measuring element is correspondingly arranged on the peak part of one spring plate.
2. The multi-point temperature measuring rod for the inner wall of the hollow circular tube test piece according to claim 1, wherein the spring plate further comprises: a fixed end located on one side of the peak and a moving end located on the other side of the peak; the fixed end with the body of rod is fixed continuous, remove the end and can follow the body of rod axial slip.
3. The multi-point temperature measuring rod for the inner wall of the hollow round tube test piece as claimed in claim 1, wherein the rod wall of the rod body is concavely provided with a plurality of shallow grooves, and each spring piece is correspondingly arranged in one of the shallow grooves.
4. The multi-point temperature measuring rod for the inner wall of the hollow round tube test piece as claimed in claim 2, wherein the fixed end is a flat plate, and the sliding end comprises an arc part which abuts against the rod wall of the rod body.
5. The multi-point temperature measuring rod for the inner wall of the hollow circular tube test piece according to claim 3, wherein the bottom of the shallow groove is a plane.
6. The multi-point temperature measuring rod for the inner wall of the hollow circular tube test piece as claimed in claim 1, wherein a boss is connected to one end of the rod body.
7. The multi-point temperature measuring rod for the inner wall of the hollow circular tube test piece as claimed in any one of claims 1 to 6, wherein the number of the spring pieces is four, and the number of the temperature measuring elements is four; the four spring pieces are evenly distributed along the circumferential direction of the rod body at intervals.
8. The method for measuring the multipoint temperature of the inner wall of the hollow circular tube test piece is characterized by comprising the following steps of:
s1, inserting the measuring rod of any one of claims 1 to 7 into a hollow circular tube test piece so that all the temperature measuring elements are in contact with the inner wall of the hollow circular tube test piece;
and S2, the temperature measuring element obtains the temperature of the contact point of the inner wall of the hollow circular tube test piece.
9. The method for measuring the multipoint temperature of the inner wall of the hollow circular tube test piece according to claim 8, wherein before the measuring rod is inserted into the hollow circular tube test piece, an annular groove is firstly processed at the inner edge of one port of the hollow circular tube test piece;
and after the measuring rod is inserted into the hollow circular tube test piece, a boss connected with one end of the measuring rod is embedded in the annular groove.
10. The method according to claim 8 or 9, wherein the hollow circular tube test piece comprises two clamping sections and an examination section located between the two clamping sections, and when the measuring rod is inserted into the hollow circular tube test piece, the temperature measuring element is located in the examination section.
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| CN202010756847.8A CN111707390B (en) | 2020-07-31 | 2020-07-31 | Multi-point temperature measuring rod for inner wall of hollow circular tube test piece and temperature measuring method thereof |
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| CN202010756847.8A CN111707390B (en) | 2020-07-31 | 2020-07-31 | Multi-point temperature measuring rod for inner wall of hollow circular tube test piece and temperature measuring method thereof |
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| CN111707390B CN111707390B (en) | 2022-04-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113405682A (en) * | 2021-06-16 | 2021-09-17 | 中国原子能科学研究院 | Pipe inner wall temperature measuring device |
| CN114354334A (en) * | 2021-12-31 | 2022-04-15 | 东方电气集团东方汽轮机有限公司 | Turbine blade is long-term service operating mode analogue test device of material for shaping |
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| CN111707390B (en) | 2022-04-05 |
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