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

Abstract

The utility model discloses a zero-response temperature measurement assembly resistant to high-speed thermal shock, and relates to the field of temperature measurement. According to the utility model, the problem that the fitting degree between the thermocouple wire temperature measuring point and the housing cannot be accurately ensured and the real-time accurate measurement is influenced because the temperature measuring point of the thermocouple wire is separated from the armored housing by a certain distance in the existing temperature measuring assembly is solved. A temperature sensitive assembly (2) is inserted in an armored protective tube (1) and is installed in the armored protective tube (1) through an installation 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 device is used for measuring the tail flame temperature of the high-speed aircraft.

Description

Technical Field

[0001] The utility model relates to the field of temperature measurement, in particular to a high-speed thermal shock-resistant zero-response temperature measurement component, 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 is a slender structure.

[0003] Although conventional armoring methods can measure high-temperature, high-speed airflow, the temperature measurement 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 measurement point of the thermocouple wire and the shell. Some temperature measurement components rely on filling with thermally 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 aircraft tail flame temperature is an important parameter to ensure flight safety. Therefore, there is an urgent need to provide a zero-response temperature measurement component that can withstand 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 a certain distance away from the armored shell, thereby affecting real-time and accurate measurement. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that in the existing temperature measuring assembly, 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 thus provide a zero-response temperature measuring assembly that is resistant to high-speed thermal shock.

[0006] The technical solution of the utility model is:

[0007] A high-speed thermal shock-resistant zero-response temperature measurement assembly comprises a mounting assembly, an armored protective tube, and a temperature-sensitive assembly. The temperature-sensitive assembly is inserted into the armored protective tube and installed in the armored protective tube via the mounting assembly. The temperature-sensitive assembly comprises a frame, a silicon nitride porcelain tube, and a tungsten-rhenium thermocouple. The tungsten-rhenium thermocouple is installed in the silicon nitride porcelain tube, which is installed in the frame. The front portion of the tungsten-rhenium thermocouple is welded into a spherical shape and then fixedly connected to the frame by welding. The frame is screwed onto 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, and an external thread is processed on the outer circumferential surface of the skeleton. The armored protective tube and the skeleton are screwed together through the external thread and the internal thread.

[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 welded into a spherical shape through a "twisted shape".

[0013] Furthermore, the "twisted shape" is welded 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. The present invention tightens the wire probe of the tungsten-rhenium thermocouple 2-3 at the connection between the armored protective tube 1 and the temperature-sensitive component 2, ensuring a tight fit between the wire probe and the armored shell (i.e., the armored protective tube 1). This ensures zero response time for front-end temperature acquisition while also ensuring high-temperature thermal shock resistance. Therefore, as an important component for measuring aircraft tail plume, the present invention can achieve rapid measurement of gas temperature under the impact of ultra-high-temperature, high-speed thermal airflow in the tail plume of high-speed aircraft.

[0019] 2, the utility model discloses the full consideration of tungsten rhenium thermocouple 2-3's filament characteristic, that is filament especially soft and thin, in order to guarantee that filament can directly contact measuring point, in order to filament not deformation, the front end of tungsten rhenium thermocouple 2-3 is shaped " spiral", and the ball is welded into spherical through argon arc welding ginger head electric welding, and the welding ball of tungsten rhenium filament spiral front end is fixed together with the skeleton section through the welding mode, and the solder is tungsten rhenium alloy electrode. Further improve the structural strength of thermoelectric couple filament, provide necessary connecting medium for the zero distance contact between temperature measuring point and armored shell, improve the service life while guaranteeing the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the whole structure schematic diagram of the utility model;

[0021] Figure 2 It is the section view of temperature sensitive component 2 and armored protection pipe 1 front end bottom connection;

[0022] Figure 3 It is temperature sensitive component and armored protection pipe connection mode schematic diagram;

[0023] Among them: 1, armored protection pipe, 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 protection pipe, 4, tail cover, 5, pressing plate, 6, screw, 7, compensation lead. DETAILED DESCRIPTION

[0024] Specific implementation mode one: combine Figures 1 to 3 Explain this implementation mode, this implementation mode includes installation component, it also includes armored protection pipe 1 and temperature sensitive component 2, temperature sensitive component 2 is inserted in armored protection pipe 1 and is installed in armored protection pipe 1 through installation component;Wherein, temperature sensitive component 2 includes skeleton 2-1, silicon nitride porcelain tube 2-2 and tungsten rhenium thermocouple 2-3, tungsten rhenium thermocouple 2-3 is installed in silicon nitride porcelain tube 2-2, silicon nitride porcelain tube 2-2 is installed in skeleton 2-1, and the front part of tungsten rhenium thermocouple 2-3 is welded into spherical and is fixedly connected with skeleton 2-1 through welding mode and is integrated, and skeleton 2-1 is screwed in the front end bottom of armored protection pipe 1.

[0025] This implementation mode makes seamless connection between filament in skeleton and armored protection pipe, makes zero response with temperature measuring point, is more accurate to temperature measurement, also improves connection strength, prevents filament from breaking or failure under the environment such as vibration, jolt.

[0026] Specific implementation mode two: combine Figures 2 to 3 Explain this implementation mode, the front end bottom of armored protection pipe 1 of this implementation mode is processed with internal thread 1-1.

[0027] In this way, the skeleton 2-1 is connected closely, and the temperature measurement speed is further ensured. The other components and connection relationships are the same as those in the first embodiment.

[0028] The third embodiment is combined with the first embodiment. Figure 2 The fourth embodiment is combined with the first embodiment. Figure 3 In this embodiment, the skeleton 2-1 is a cylinder skeleton, and an external thread 2-4 is formed on the outer circumferential surface of the skeleton 2-1. The armored protective tube 1 and the skeleton 2-1 are connected through the external thread 2-4 and the internal thread 1-1.

[0029] In this way, a shoulder is arranged at the position corresponding to the external thread 2-4 in the skeleton. The shoulder is processed to reduce the inner diameter of the skeleton, so that the contact between the skeleton and the hot-wire thermocouple after welding is ensured, the accuracy of temperature measurement is ensured, and the problem of too much solder and too long conduction time is avoided. The other components and connection relationships are the same as those in the first or second embodiment.

[0030] In this embodiment, the threaded connection between the armored protective tube 1 and the skeleton 2-1 not only quickly combines the two, but also ensures that the contact position of the two is closely attached through the processing of the thread parameters, which ensures the zero response of temperature measurement.

[0031] The fourth embodiment is combined with the first embodiment. Figure 2 In this embodiment, a plurality of axial through holes 2-5 are formed in the silicon nitride ceramic tube 2-2.

[0032] In this way, the tungsten-rhenium thermocouple 2-3 is installed. The other components and connection relationships are the same as those in any one of the first to third embodiments.

[0033] The fifth embodiment is combined with the first embodiment. Figure 2 In this embodiment, one end of the tungsten-rhenium thermocouple 2-3 passes through one axial through hole 2-5 and is twisted into a hot-wire thermocouple at the end of the silicon nitride ceramic 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 with the installation assembly. In this way, the mechanical strength of the hot-wire thermocouple after welding is improved, thereby improving the environmental adaptability of the hot-wire thermocouple. The other components and connection relationships are the same as those in any one of the first to fourth embodiments.

[0034] The sixth embodiment is combined with the first embodiment. Figure 2 In this embodiment, the front part of the tungsten-rhenium thermocouple 2-3 is welded into a spherical 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 temperature of the measured environment. The other components and connection relationships are the same as those in any one of the first to fifth embodiments.

[0035] Specific implementation method seven: combination Figure 2 This embodiment will be described. In this embodiment, the "twisted shape" is welded into a spherical shape by welding using tungsten-rhenium alloy solder.

[0036] This arrangement ensures reliable connection 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 embodiments 1 to 6.

[0037] Specific implementation method eight: combination Figures 1 to 3 In this embodiment, the armored protective tube 1 is made of a tungsten-copper alloy. This configuration ensures both high-temperature and high-pressure resistance while ensuring integrated processing. The remaining components and connections are identical to those in any of the first through seventh embodiments.

[0038] Specific implementation method nine: Combination Figure 1 To illustrate this embodiment, the mounting assembly of this 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] This configuration 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 embodiments 1 to 8.

[0041] Specific implementation method ten: Combination Figure 1 To describe this embodiment, the insulating protective tube 3 and the silicon nitride porcelain tube 2 - 2 are bonded together by high-temperature ceramic adhesive.

[0042] This arrangement 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 1 to 9.

[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 Explain the working principle of this utility model:

[0047] After the temperature sensitive component is initially made, the temperature sensitive component is connected with the armored protective tube, the front end of the armored protective tube has internal threads, the outer surface of the skeleton has external threads, and the two are connected through thread screwing, and the screwing is stopped until the tight fit.

[0048] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-speed thermal shock-resistant zero-response temperature measurement assembly, comprising a mounting assembly, 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 is installed in the armored protective tube (1) through an installation component; The temperature sensitive component (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), and 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 onto 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 into a "twisted" thermocouple at the end of the silicon nitride porcelain tube (2-2). 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.

7. The high-speed thermal shock-resistant zero-response temperature measurement component according to claim 6, characterized in that: The "twist 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. The 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) through screws (6); and the compensation 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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