Zero-response temperature measurement assembly resistant to high-speed thermal shock

Abstract

The invention discloses a zero-response temperature measurement assembly resistant to high-speed thermal shock, and relates to the field of temperature measurement. According to the invention, the problem that the fitting degree between the thermocouple wire temperature measurement point and the shell cannot be accurately ensured due to the fact that the temperature measurement point of the thermocouple wire is a certain distance away from the armored shell in the existing temperature measurement assembly, and the real-time accurate measurement is affected is solved. A temperature sensitive assembly (2) is inserted into an armored protective tube (1) and is mounted in the armored protective tube (1) through a mounting assembly; the tungsten-rhenium thermocouple (2-3) is installed in the silicon nitride porcelain tube (2-2), the silicon nitride porcelain tube (2-2) is installed in the framework (2-1), the front portion of the tungsten-rhenium thermocouple (2-3) is welded into a sphere and then fixedly connected with the framework (2-1) into a whole in a welding mode, and the framework (2-1) is screwed at the bottom of the front end of the armored protection tube (1). The method is used for measuring the tail flame temperature of the high-speed aircraft.

Description

Technical Field

[0001] The invention relates to the field of temperature measurement, and in particular to a zero-response temperature measurement component resistant to high-speed thermal shock, which is used for rapid measurement of gas temperature under the impact of ultra-high temperature and high-speed hot air flow in the tail flame of a high-speed aircraft. Background Art

[0002] During the flight of a high-speed aircraft in space, the blue flame in the tail flame of the aircraft can reach over 2500℃, and the high temperature and high pressure discharged by some aircraft engines can accelerate to a speed of over 1000m / s. If the temperature of the tail flame is to be accurately and quickly measured under the impact of such high-speed airflow, the temperature measuring component needs to withstand a pressure of at least MPa level. The assembly method of such a high-temperature and high-pressure resistant component is difficult to achieve fast and accurate measurement. The tail flame temperature measuring rod of a high-speed aircraft is relatively long and thin, that is, it belongs to a slender structure.

[0003] Although the conventional armoring method can measure high-temperature and high-speed airflow, the temperature measuring point of the thermocouple wire is a certain distance away from the armor shell after assembly. This distance will make it impossible to accurately ensure the fit between the temperature measuring point of the thermocouple wire and the shell. Some temperature measuring components rely on filling thermal conductive materials such as alumina powder to improve the response time, but the response time is still not ideal after actual testing. Real-time and accurate measurement of the tail flame temperature of an aircraft is an important parameter to ensure flight safety. Therefore, it is urgent to provide a zero-response temperature measuring component that is resistant to high-speed thermal shock.

[0004] In summary, the existing temperature measurement assembly cannot accurately ensure the fit between the temperature measurement point of the thermocouple wire and the shell because the temperature measurement point of the thermocouple wire is at a certain distance from the armored shell, thus affecting the problem of real-time accurate measurement. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that in the existing temperature measuring component, the temperature measuring point of the thermocouple wire is at a certain distance from the armored shell, which makes it impossible to accurately ensure the fit between the temperature measuring point of the thermocouple wire and the shell, thereby affecting real-time accurate measurement, and further to provide a zero-response temperature measuring component that is resistant to high-speed thermal shock.

[0006] The technical solution of the present invention is:

[0007] A high-speed thermal shock-resistant zero-response temperature measurement component comprises a mounting component, an armored protective tube and a temperature-sensitive component, wherein the temperature-sensitive component is inserted into the armored protective tube and installed in the armored protective tube through the mounting component; wherein the temperature-sensitive component comprises a skeleton, a silicon nitride porcelain tube and a tungsten-rhenium thermocouple, wherein the tungsten-rhenium thermocouple is installed in the silicon nitride porcelain tube, wherein the silicon nitride porcelain tube is installed in the skeleton, and the front part of the tungsten-rhenium thermocouple is welded into a spherical shape and then fixedly connected to the skeleton by welding, and the skeleton is screwed on the front end bottom of the armored protective tube.

[0008] Furthermore, the front end bottom of the armored protective tube is processed with an internal thread.

[0009] Furthermore, the skeleton is a cylindrical skeleton, an outer circumferential surface of the skeleton is processed with external threads, and the armored protective tube and the skeleton are screwed and connected via the external threads and internal threads.

[0010] Preferably, a plurality of axial through holes are provided on the silicon nitride ceramic tube.

[0011] Furthermore, one end of the tungsten-rhenium thermocouple passes through an axial through hole and is screwed into a "twisted" thermocouple at the end of the silicon nitride porcelain tube, and the other end of the tungsten-rhenium thermocouple passes through another axial through hole and is connected to the mounting assembly.

[0012] Furthermore, the front part of the tungsten-rhenium thermocouple is "twisted" and welded into a spherical shape.

[0013] Furthermore, the "twist-like" welding is performed into a spherical shape by welding with tungsten-rhenium alloy solder.

[0014] Preferably, the material of the armored protective tube is tungsten copper alloy.

[0015] Furthermore, the installation assembly includes an insulating protective tube, a tail cover, a pressure plate, screws and a compensation wire. The insulating protective tube is inserted into the armored protective tube and connected to the end of the silicon nitride porcelain tube. The tail cover is screwed on the rear of the armored protective tube. The pressure plate is installed on the tail cover by screws. The compensation wire passes through the pressure plate and is connected to the tungsten-rhenium thermocouple.

[0016] Furthermore, the insulating protective tube and the silicon nitride porcelain tube are bonded together by high temperature ceramic glue.

[0017] Compared with the prior art, the present invention has the following effects:

[0018] 1. In the present invention, at the connection between the armored protective tube 1 and the temperature sensitive component 2, the wire probe of the tungsten-rhenium thermocouple 2-3 is tightened so that the wire is closely fitted to the armored shell (that is, the armored protective tube 1), and the high-temperature heat shock resistance is guaranteed while the front-end temperature acquisition has zero response time. Therefore, as an important component for measuring the tail flame of an aircraft, the present invention can realize the rapid measurement of the gas temperature under the impact of ultra-high temperature and high-speed hot air flow in the tail flame of a high-speed aircraft.

[0019] 2. The present invention fully considers the characteristics of the thermocouple wire of the tungsten-rhenium thermocouple 2-3, that is, the thermocouple wire is particularly soft and thin. In order to ensure that the thermocouple wire can directly contact the measuring point and prevent the thermocouple wire from being deformed, the front end of the thermocouple wire is shaped into a "twisted shape", and the head is welded into a ball shape by argon arc welding. The front end welding ball of the thermocouple wire is fixed to the skeleton section by welding, and the solder is a tungsten-rhenium alloy welding rod. The structural strength of the thermocouple wire is further improved, and the necessary connection medium is provided for the zero-distance contact between the temperature measuring point and the armored shell, which not only ensures the measurement accuracy but also improves the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a cross-sectional view of the connection between the temperature sensitive component 2 and the front bottom of the armored protective tube 1;

[0022] Figure 3 It is a schematic diagram of the connection method between the temperature sensitive component and the armored protective tube;

[0023] Among them: 1. Armored protective tube, 1-1. Internal thread, 2. Temperature sensitive component, 2-1. Skeleton, 2-2. Silicon nitride porcelain tube, 2-3. Tungsten-rhenium thermocouple, 2-4. External thread, 2-5. Axial through hole, 3. Insulating protective tube, 4. Tail cover, 5. Pressure plate, 6. Screws, 7. Compensating wire. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment includes a mounting assembly, which also includes an armored protective tube 1 and a temperature sensitive assembly 2. The temperature sensitive assembly 2 is inserted into the armored protective tube 1 and installed in the armored protective tube 1 through the mounting assembly. The temperature sensitive assembly 2 includes a skeleton 2-1, a silicon nitride porcelain tube 2-2 and a tungsten-rhenium thermocouple 2-3. The tungsten-rhenium thermocouple 2-3 is installed in the silicon nitride porcelain tube 2-2. The silicon nitride porcelain tube 2-2 is installed in the skeleton 2-1. The front part of the tungsten-rhenium thermocouple 2-3 is welded into a spherical shape and fixedly connected to the skeleton 2-1 by welding. The skeleton 2-1 is screwed on the front bottom of the armored protective tube 1.

[0025] This embodiment achieves zero response to the temperature measurement point through seamless connection between the even wire in the skeleton and the armored protective tube, making the temperature measurement more accurate and improving the connection strength, thereby preventing the even wire from breaking or failing under vibration, bumps and the like.

[0026] Specific implementation method 2: Combination Figures 2 to 3 The present embodiment is described. The front end bottom of the armored sheath 1 of the present embodiment is processed with an internal thread 1 - 1 .

[0027] Such a configuration facilitates close connection with the frame 2-1, further ensuring the temperature measurement response speed. Other components and connection relationships are the same as those in the first specific implementation.

[0028] Specific implementation method three: Combination Figure 2 and Figure 3 To explain this embodiment, the skeleton 2-1 of this embodiment is a cylindrical skeleton, and an external thread 2-4 is processed on the outer circumferential surface of the skeleton 2-1. The armored protective tube 1 and the skeleton 2-1 are screwed together through the external thread 2-4 and the internal thread 1-1.

[0029] In this way, a shoulder is provided inside the skeleton corresponding to the external thread 2-4. The processing of the shoulder makes the inner diameter of the skeleton smaller, which is convenient for contacting with the "twisted" thermocouple after welding, ensuring the accuracy of the temperature measurement response and avoiding the problem of excessive solder and the need for longer conduction time. The other components and connection relationships are the same as those of the first or second specific implementation.

[0030] The threaded connection between the armored protective tube 1 and the frame 2-1 in this embodiment can not only quickly combine the two, but also ensure that the contact parts of the two are tightly fitted through the processing of thread parameters, which can ensure zero response of temperature measurement.

[0031] Specific implementation method four: Combination Figure 2 To describe this embodiment, a plurality of axial through holes 2-5 are provided on the silicon nitride porcelain tube 2-2 of this embodiment.

[0032] Such arrangement is used to install the tungsten-rhenium thermocouple 2-3. Other components and connection relationships are the same as any one of the specific embodiments 1 to 3.

[0033] Specific implementation method five: Combination Figure 2 To explain this embodiment, one end of the tungsten-rhenium thermocouple 2-3 of this embodiment passes through an axial through hole 2-5, and is screwed into a "twisted" thermocouple at the end of the silicon nitride porcelain tube 2-2, and the other end of the tungsten-rhenium thermocouple 2-3 passes through another axial through hole 2-5 and is connected to the mounting assembly. This arrangement improves the mechanical strength of the thermocouple after welding, thereby improving the environmental adaptability of the thermocouple. The other components and connection relationships are the same as any one of the specific embodiments one to four.

[0034] Specific implementation method six: Combination Figure 2 To illustrate this embodiment, the front part of the tungsten-rhenium thermocouple 2-3 of this embodiment is welded into a spherical shape in a "twisted shape". In this way, the positive and negative electrodes of the tungsten-rhenium thermocouple are reliably connected together to form a temperature sensing node for testing the measured ambient temperature. The other components and connection relationships are the same as any one of the specific embodiments one to five.

[0035] Specific implementation method seven: Combination Figure 2 The present embodiment is described. In the present embodiment, the "braided shape" is welded into a spherical shape by welding using a tungsten-rhenium alloy solder.

[0036] Such arrangement ensures reliable overlap between the tungsten-rhenium thermocouple wire and the frame, and improves the response time of temperature measurement. Other components and connection relationships are the same as any one of the specific implementation modes 1 to 6.

[0037] Specific implementation method eight: Combination Figures 1 to 3 In this embodiment, the material of the armored protective tube 1 is tungsten copper alloy. In this way, after the integrated processing of the armored protective tube is ensured, the high temperature resistance and pressure resistance of the armored protective tube are guaranteed. The other components and connection relationships are the same as any one of the specific embodiments 1 to 7.

[0038] Specific implementation method nine: Combination Figure 1 The present embodiment is described. The mounting assembly of the present embodiment includes an insulating protective tube 3, a tail cover 4, a pressing plate 5, screws 6 and a compensation wire 7.

[0039] The insulating protective tube 3 is inserted into the armored protective tube 1 and connected to the end of the silicon nitride porcelain tube 2-2. The tail cover 4 is screwed on the rear of the armored protective tube 1. The pressure plate 5 is installed on the tail cover 4 by screws 6. The compensation wire 7 passes through the pressure plate 5 and is connected to the tungsten-rhenium thermocouple 2-3.

[0040] Such arrangement is used to improve the insulation performance of the thermocouple node in a mechanical environment and a thermal environment. Other components and connection relationships are the same as any one of the specific implementation modes 1 to 8.

[0041] Specific implementation method ten: Combination Figure 1 The present embodiment is described. The insulating protective tube 3 and the silicon nitride porcelain tube 2 - 2 of the present embodiment are bonded together by high temperature ceramic glue.

[0042] Such a configuration is used to fix the tungsten-rhenium thermocouple wire, reduce the thermal response area of ​​the thermocouple temperature sensing node, and improve the reliability of the thermocouple wire in a mechanical environment. Other components and connection relationships are the same as any one of the specific embodiments one to nine.

[0043] The tungsten-rhenium pair wire and the compensation wire in this embodiment are connected together by welding.

[0044] The armored protective tube and the tail cover of this embodiment are screwed together by threads.

[0045] The compensation wire of this embodiment is fixed by the pressing plate of the tail cover.

[0046] according to Figures 1 to 3 The working principle of the present invention is described:

[0047] After the temperature sensitive component is initially manufactured, it is connected to the armored protective tube. The front end of the armored protective tube has an internal thread, and the outer surface of the frame has an external thread. The two are connected by screwing and rotating until they fit tightly. After tightening, the even wire and the armored protective tube are rigidly connected by metal, and the heat conduction speed is fast.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A zero-response temperature measurement component resistant to high-speed thermal shock, comprising a mounting component, characterized in that: It also includes an armored protective tube (1) and a temperature sensitive component (2), wherein the temperature sensitive component (2) is inserted into the armored protective tube (1) and installed in the armored protective tube (1) through an installation component; The temperature sensitive component (2) comprises a frame (2-1), a silicon nitride porcelain tube (2-2) and a tungsten-rhenium thermocouple (2-3); the tungsten-rhenium thermocouple (2-3) is installed in the silicon nitride porcelain tube (2-2), the silicon nitride porcelain tube (2-2) is installed in the frame (2-1), and the front part of the tungsten-rhenium thermocouple (2-3) is welded into a spherical shape and fixedly connected to the frame (2-1) by welding, and the frame (2-1) is screwed on the front bottom of the armored protective tube (1).

2. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 1, characterized in that: The front end bottom of the armored protective tube (1) is processed with an internal thread (1-1).

3. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 2, characterized in that: The skeleton (2-1) is a cylindrical skeleton, and an external thread (2-4) is processed on the outer circumferential surface of the skeleton (2-1). The armored protective tube (1) and the skeleton (2-1) are screwed together via the external thread (2-4) and the internal thread (1-1).

4. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 3, characterized in that: A plurality of axial through holes (2-5) are provided on the silicon nitride porcelain tube (2-2).

5. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 4, characterized in that: One end of the tungsten-rhenium thermocouple (2-3) passes through an axial through hole (2-5) and is screwed at the end of the silicon nitride porcelain tube (2-2) to form a "twisted" thermocouple. The other end of the tungsten-rhenium thermocouple (2-3) passes through another axial through hole (2-5) and is connected to the mounting assembly.

6. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 5, characterized in that: The front part of the tungsten-rhenium thermocouple (2-3) is welded into a spherical shape in a "twisted" manner.

7. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 6, characterized in that: The "twisted" shape is welded into a spherical shape using tungsten-rhenium alloy solder.

8. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 1, characterized in that: The material of the armored protective tube (1) is tungsten-copper alloy.

9. A high-speed thermal shock resistant zero-response temperature measurement component according to claim 1 or 8, characterized in that: The installation assembly includes an insulating protective tube (3), a tail cover (4), a pressure plate (5), screws (6) and a compensation wire (7). The insulating protective tube (3) is inserted into the armored protective tube (1) and connected to the end of the silicon nitride porcelain tube (2-2); the tail cover (4) is screwed on the rear of the armored protective tube (1); the pressing plate (5) is installed on the tail cover (4) by means of screws (6); and the compensating wire (7) passes through the pressing plate (5) and is connected to the tungsten-rhenium thermocouple (2-3).

10. The high-speed thermal shock resistant zero-response temperature measurement component according to claim 9, characterized in that: The insulating protective tube (3) and the silicon nitride porcelain tube (2-2) are bonded together by high-temperature ceramic glue.

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