Multi-point temperature measuring device and method for inner wall of hollow round pipe with adjustable contact pressure
阅读说明：本技术 接触压力可调的空心圆管内壁多点温度测量装置及方法 (Multi-point temperature measuring device and method for inner wall of hollow round pipe with adjustable contact pressure ) 是由 唐诗白 荆甫雷 于 2020-07-31 设计创作，主要内容包括：本公开提供了一种接触压力可调的空心圆管内壁多点温度测量装置及方法。测量装置,包括凸台、螺母、螺栓、数个长条形弹片、以及数个测温元件；螺栓包括螺杆和头部；凸台设有通孔,全部弹片的一端与凸台相连,并沿通孔外围周向间隔分布；弹片另一端设有突起部,每个测温元件对应安装于一个突起部上；螺杆穿过通孔,头部位于全部弹片之间,并且头部与弹片相抵触；螺母从凸台远离弹片的一侧与螺杆旋接。测量方法,包括将测量装置的所有弹片插入空心圆管试件,并使得全部测温元件与空心圆管试件的内壁接触。通过旋紧螺母,使得各弹片受到螺栓头部浅槽向外挤压,产生挠性变形,致使热电偶压紧在试件内壁的不同周向位置,从而实现内壁温度的多点测量。(The disclosure provides a device and a method for measuring the multipoint temperature of the inner wall of a hollow round pipe with adjustable contact pressure. The measuring device comprises a boss, a nut, a bolt, a plurality of strip-shaped elastic sheets and a plurality of temperature measuring elements; the bolt comprises a screw rod and a head part; the lug boss is provided with through holes, and one end of each elastic sheet is connected with the lug boss and is circumferentially distributed at intervals along the periphery of the through holes; the other end of the elastic sheet is provided with a protruding part, and each temperature measuring element is correspondingly arranged on one protruding part; the screw rod penetrates through the through hole, the head part is positioned among all the elastic sheets, and the head part is abutted against the elastic sheets; the nut is screwed with the screw rod from one side of the lug boss far away from the elastic sheet. The measuring method comprises the steps of inserting all the elastic sheets of the measuring device into the 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. By screwing the nut, each elastic sheet is extruded outwards by the bolt head shallow groove to generate flexible deformation, so that the thermocouples are tightly pressed at different circumferential positions of the inner wall of the test piece, and the temperature of the inner wall is measured at multiple points.)
1. A multi-point temperature measuring device for the inner wall of a hollow round tube with adjustable contact pressure is characterized by comprising a boss, a nut, a bolt, a plurality of strip-shaped elastic sheets and a plurality of temperature measuring elements; the bolt comprises a screw and a head connected with the screw;
the boss is provided with a through hole which can pass through the screw rod, one end of each elastic sheet is connected with the boss, and the elastic sheets are circumferentially distributed at intervals along the periphery of the through hole; one end of the elastic sheet, which is far away from the boss, is provided with a protruding part, and each temperature measuring element is correspondingly arranged on one protruding part;
the screw rod penetrates through the through hole from one side of the lug boss connected with the elastic sheets, the head part is positioned between all the elastic sheets, and the head part is abutted to the elastic sheets; the nut is screwed with the screw rod from one side of the lug boss, which is far away from the elastic sheet.
2. The multi-point temperature measuring device with the adjustable contact pressure for the inner wall of the hollow round pipe as claimed in claim 1, wherein the head is provided with a plurality of shallow grooves, and each spring plate is correspondingly embedded in one shallow groove.
3. The multi-point temperature measuring device for the inner wall of the hollow round pipe with the adjustable contact pressure as claimed in claim 1, wherein a flange part surrounding the through hole is arranged on one side surface of the boss; one end of the elastic sheet is fixedly connected with the flange part.
4. The multi-point temperature measuring device for the inner wall of the hollow round pipe with the adjustable contact pressure as claimed in claim 2, wherein the bottom of the shallow groove is a plane.
5. The multi-point temperature measuring device for the inner wall of the hollow circular tube with the adjustable contact pressure as claimed in any one of claims 1 to 4, wherein the number of the elastic sheets is four, the number of the temperature measuring elements is four, and the four elastic sheets are uniformly distributed at intervals along the peripheral direction of the through hole.
6. The multi-point temperature measuring device with the adjustable contact pressure for the inner wall of the hollow round tube as claimed in any one of claims 1 to 4, wherein the elastic sheet is a metal sheet.
7. A multi-point temperature measuring method for the inner wall of a hollow round pipe with adjustable contact pressure is characterized by comprising the following steps:
s1, inserting all the elastic sheets of the measuring device of any one of claims 1 to 6 into a hollow round tube test piece, and enabling all the temperature measuring elements to be in contact with the inner wall of the hollow round 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.
8. The method for measuring the temperature of the inner wall of the hollow round tube with adjustable contact pressure as claimed in claim 7, wherein after the measuring device is inserted into the hollow round tube test piece, the nut can be unscrewed or screwed if necessary to adjust the contact pressure of the temperature measuring element and the inner wall of the hollow round tube test piece.
9. The method for measuring the multi-point temperature of the inner wall of the hollow round pipe with the adjustable contact pressure as claimed in claim 7, wherein before the measuring device is inserted into the hollow round pipe test piece, an annular groove is firstly processed at the inner edge of one port of the hollow round pipe test piece;
and after the measuring device is inserted into the hollow circular tube test piece, the boss is embedded in the annular groove.
10. The method for measuring the temperature of the inner wall of the hollow round tube with the adjustable contact pressure according to claim 7, 8 or 9, wherein the hollow round tube test piece comprises two clamping sections and an examination section located between the two clamping sections, and when the measuring device is inserted into the hollow round tube test piece, the temperature measuring element is located in the examination section.
Technical Field
The disclosure relates to temperature measurement of the inner wall of a hollow round pipe, in particular to a multi-point temperature measurement device and method for the inner wall of the hollow round pipe with adjustable contact pressure.
Background
An aircraft engine is one of the core components of an aircraft, and a large number of components of the aircraft engine are subjected to high-temperature, high-pressure and high-rotation-speed working loads under complicated and severe working conditions, and turbine blades are the most representative components subjected to the high loads. Blades of aircraft engines are subject to asymmetric cyclic loads and temperature variations during take-off, cruise, landing, shutdown, etc., which can lead to low cycle fatigue failure and thermal engine cycle fatigue failure of the blade material. Therefore, the research on the fatigue performance of the single crystal material and the fatigue life prediction become the basic work for the structural strength design of the turbine blade.
Statistics of the data show that in the event of failure of a gas turbine jet engine, a percentage of 49% is associated with fatigue. The turbine is used as an important hot-end component of the engine, the working condition of the turbine is worse, and the problem of fatigue failure is more prominent. During operation, due to the frequent change of flight conditions, the engine will repeatedly go through the processes of starting, accelerating, decelerating and stopping, so that the temperature, pressure and rotor speed of the combustion gas will change accordingly. Therefore, the temperature field distribution of the turbine component and the mechanical load experienced thereby are actually in a variable state, i.e., a thermo-mechanical fatigue (TMF) state. TMF will cause severe degradation of mechanical properties of turbine materials, and is undoubtedly a serious challenge for structural reliability and durability of the engine.
To simulate the above TMF conditions, TMF tests performed under laboratory conditions included both mechanical load and temperature cycling. 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 ISO, European Union, USA and national standard establishment. 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. However, the surface of the test piece is easily subjected to initial damage due to instantaneous high temperature generated during welding, and in addition, due to the fact that the length-diameter ratio of the TMF test piece is large, the technical difficulty of a welding method is too large, insufficient welding is easily caused, and welding spots are invalid when the temperature of the inner wall of the hollow circular tube test piece is measured.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present disclosure provides a device and a method for measuring temperature of multiple points on the inner wall of a hollow circular tube with adjustable contact pressure, which are specifically implemented as follows:
a multi-point temperature measuring device with adjustable contact pressure for the inner wall of a hollow round tube comprises a boss, a nut, a bolt, a plurality of strip-shaped elastic sheets and a plurality of temperature measuring elements; the bolt comprises a screw and a head connected with the screw;
the boss is provided with a through hole which can pass through the screw rod, one end of each elastic sheet is connected with the boss, and the elastic sheets are circumferentially distributed at intervals along the periphery of the through hole; one end of the elastic sheet, which is far away from the boss, is provided with a protruding part, and each temperature measuring element is correspondingly arranged on one protruding part;
the screw rod penetrates through the through hole from one side of the lug boss connected with the elastic sheets, the head part is positioned between all the elastic sheets, and the head part is abutted to the elastic sheets; the nut is screwed with the screw rod from one side of the lug boss, which is far away from the elastic sheet.
Furthermore, the head is provided with a plurality of shallow grooves, and each spring plate is correspondingly embedded in one of the shallow grooves.
Furthermore, a flange part surrounding the through hole is arranged on one side surface of the boss; one end of the elastic sheet is fixedly connected with the flange part.
Furthermore, the groove bottom of the shallow groove is a plane.
Furthermore, the number of the elastic sheets is four, the number of the temperature measuring elements is four, and the four elastic sheets are uniformly distributed at intervals along the peripheral circumference of the through hole.
Furthermore, the elastic sheet is a metal sheet.
A multi-point temperature measuring method for the inner wall of a hollow round pipe with adjustable contact pressure comprises the following steps:
s1, inserting all the elastic sheets of the measuring device 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, after the measuring device is inserted into the hollow circular tube test piece, the nut can be unscrewed or screwed if necessary to adjust the pressure of the temperature measuring element contacting the inner wall of the hollow circular tube test piece.
Further, before the measuring device 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 device is inserted into the hollow circular tube test piece, the boss is embedded in the annular groove.
Furthermore, the hollow circular tube test piece comprises two clamping sections and an examination section positioned between the two clamping ends, and when the measuring device is inserted into the hollow circular tube test piece, the temperature measuring element is positioned 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 view of an assembly of the measurement device of the present disclosure;
FIG. 2 is an exploded schematic view of a measurement device of the present disclosure;
fig. 3 is a schematic structural view of the spring plate of the present disclosure after being assembled on the boss;
FIG. 4 is a schematic view of the structure of FIG. 3 in the direction C;
FIG. 5 is a schematic structural view of a boss of the present disclosure;
FIG. 6 is a front view structural schematic of a boss of the present disclosure;
fig. 7 is a schematic structural view of a spring plate according to the present disclosure;
FIG. 8 is a schematic view of an assembly structure of the elastic sheet and the temperature measuring element according to the present disclosure;
FIG. 9 is a schematic structural view of a bolt of the present disclosure;
FIG. 10 is a front view structural schematic of the head of the bolt of the present disclosure;
FIG. 11 is a schematic structural view of a hollow round tube test piece of the present disclosure;
FIG. 12 is a schematic structural view of a hollow round tube test piece of the present disclosure before machining a groove;
FIG. 13 is a schematic view of the measuring device of the present disclosure, with the nut not tightened;
FIG. 14 is a schematic view of a measuring device of the present disclosure after the nut has been tightened;
FIG. 15 is a schematic diagram of the mechanism of the present disclosure after assembly of the measurement device with a hollow round tube test piece;
FIG. 16 is an enlarged partial schematic view taken at a in FIG. 15;
the hollow round tube test piece comprises a hollow round
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.
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