Thermocouple assembly and preparation method thereof

Abstract

The invention discloses a thermocouple assembly and a preparation method thereof, relates to the field of aero-engine combustion chamber part testing, and is used for measuring the outlet temperature of a combustion chamber. The thermocouple assembly comprises a rhenium iridium sleeve, a temperature measuring assembly and an insulating part. The rhenium iridium sleeve comprises a first mounting hole; the wall body of the first mounting hole comprises a rhenium material layer and an iridium material layer attached to the outside of the rhenium material layer. The temperature measuring assembly comprises a plug and a thermocouple wire connected with the plug; the end, away from the plug, of the thermocouple wire is located in the first mounting hole of the rhenium-iridium sleeve. The end part of one end, far away from the plug, of the thermocouple wire abuts against the inner wall of the first mounting hole. The insulating part is located in the rhenium-iridium sleeve, and the insulating part is located between the inner wall of the rhenium-iridium sleeve and the thermocouple wire. According to the technical scheme, the temperature of the outlet of the combustion chamber can only be transmitted to the hot contact of the thermocouple wire through the rhenium-iridium sleeve, and accurate measurement of the temperature of the outlet of the combustion chamber is achieved.

Description

Technical Field

[0001] The present invention relates to the field of testing components of an aero-engine combustion chamber, and particularly to a thermocouple assembly and a preparation method thereof. Background Art

[0002] China has basically possessed the ability to independently develop third-generation turbofan and turboshaft engines. However, the current engine R & D level still cannot meet the strong domestic market demand. The key reason is that the internal flow field in the propulsion system is a complex process of chemical reaction, flow, and heat transfer coupling, and the lack of reliable and effective measurement technology has led to our far from sufficient understanding of the basic phenomena and essential laws of the engine internal flow field, restricting the engine technology level. Therefore, the lack of matching high-performance engine measurement technology has become one of the bottlenecks restricting the development of military and civilian aircraft.

[0003] High temperature rise is an important development direction for future aero-engine combustion chambers. For military aircraft, with the continuous increase in the requirements for thrust-to-weight ratio of aero-engines and the continuous increase in engine pressure ratio, the combustion chamber is developing towards high temperature rise. Currently, the combustion chamber being developed with a thrust-to-weight ratio of 10 has an inlet temperature of 850K and an average outlet temperature above 1850K, and the hot spot temperature can reach 2150K. For the fifth-generation aircraft currently being pre-researched in China, the highest outlet temperature can reach above 2300K.

[0004] The inventor found that there are at least the following problems in the prior art: the outlet temperature of the combustion chamber is getting higher and higher, and currently, the industry urgently needs a measuring device capable of measuring the temperature above 2300K at the outlet of the combustion chamber. Summary of the Invention

[0005] The present invention provides a thermocouple assembly and a preparation method thereof for measuring the outlet temperature of a combustion chamber.

[0006] An embodiment of the present invention provides a thermocouple assembly, including:

[0007] A rhenium-iridium sleeve, including a first mounting hole; the wall of the first mounting hole includes a rhenium material layer and an iridium material layer attached to the outside of the rhenium material layer;

[0008] A temperature measuring assembly, including a plug and a thermocouple wire connected to the plug; the end of the thermocouple wire away from the plug is located in the first mounting hole of the rhenium-iridium sleeve, and the end of the thermocouple wire away from the plug abuts against the inner wall of the first mounting hole; and

[0009] An insulating member, located inside the rhenium-iridium sleeve, and the insulating member is located between the inner wall of the rhenium-iridium sleeve and the thermocouple wire.

[0010] In some embodiments, the rhenium-iridium sleeve includes a closed end and an open end; one end of the thermocouple wire away from the plug is configured as a spherical contact and abuts against the inner wall of the closed end of the rhenium-iridium sleeve.

[0011] In some embodiments, the closed end of the rhenium-iridium sleeve is configured as a pointed cone, and the tip angle of the closed end of the rhenium-iridium sleeve is 55° to 65°.

[0012] In some embodiments, along the length direction of the rhenium-iridium sleeve, a plurality of the insulating members are dispersedly arranged.

[0013] In some embodiments, the thermocouple assembly further includes a transition pipe. One end of the transition pipe is fixedly connected to the rhenium-iridium sleeve, and the other end of the transition pipe is fixedly connected to the temperature measuring assembly; the transition pipe includes a second mounting hole, and one end of the thermocouple wire away from the plug extends into the first mounting hole through the second mounting hole; the first mounting hole and the second mounting hole are communicated and sealed.

[0014] In some embodiments, a protective gas is introduced into the first mounting hole and the second mounting hole.

[0015] In some embodiments, the protective gas includes argon.

[0016] In some embodiments, the end of the second mounting hole away from the first mounting hole is sealed with a sealant.

[0017] In some embodiments, the sealant includes epoxy resin glue.

[0018] In some embodiments, the wall thickness of the rhenium-iridium sleeve is 0.25 mm to 0.50 mm; and / or, the outer diameter of the rhenium-iridium sleeve is 2.5 mm to 3.0 mm; and / or, the diameter of the thermocouple wire (22) is 0.25 mm to 0.38 mm.

[0019] In some embodiments, the thickness of the rhenium material layer is 0.15 mm to 0.30 mm; and / or, the thickness of the iridium material layer is 0.10 mm to 0.20 mm.

[0020] In some embodiments, the insulating member includes a hafnium oxide ceramic tube.

[0021] An embodiment of the present invention further provides a method for preparing a thermocouple assembly, including the following steps:

[0022] Prepare a rhenium-iridium sleeve;

[0023] Sheath an insulating member outside the thermocouple wire of the temperature measuring assembly to obtain a thermocouple wire assembly;

[0024] Insert the thermocouple wire assembly into the rhenium-iridium sleeve.

[0025] In some embodiments, after the step of inserting the thermocouple wire assembly into the rhenium-iridium sleeve, the following steps are further included:

[0026] Introduce a protective gas into the first mounting hole of the rhenium-iridium sleeve;

[0027] Seal the rhenium-iridium sleeve.

[0028] In some embodiments, after the step of preparing the rhenium-iridium sleeve, the following steps are further included:

[0029] Weld and fix the rhenium-iridium sleeve to the adapter pipe, and make the rhenium-iridium sleeve and the adapter pipe be hermetically connected and fixed;

[0030] Fix the adapter pipe to the plug of the temperature measuring assembly.

[0031] In some embodiments, the preparation of the rhenium-iridium sleeve includes the following steps:

[0032] Deposit a rhenium material layer on the surface of the substrate;

[0033] Deposit an iridium material layer outside the rhenium material layer deposited on the surface of the graphite mandrel;

[0034] Remove the graphite mandrel to obtain the rhenium-iridium sleeve.

[0035] In some embodiments, the substrate includes a graphite mandrel.

[0036] For the thermocouple assembly provided by the above technical solution, its measuring end uses a rhenium-iridium sleeve. The rhenium-iridium sleeve includes an independent rhenium material layer and an iridium material layer attached to the outside of the rhenium material layer, and has good high-temperature resistance and oxidation resistance; the thermocouple wire of the temperature measuring assembly extends into the first mounting hole of the rhenium-iridium sleeve. An insulating member is used to make other areas of the thermocouple wire not contact the inner wall of the rhenium-iridium sleeve except for the end portion, and only the hot junction of the thermocouple wire contacts the inner wall of the rhenium-iridium sleeve. The temperature at the combustion chamber outlet can only be transmitted to the hot junction of the thermocouple wire through the rhenium-iridium sleeve, realizing accurate measurement of the temperature at the combustion chamber outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0038] Figure 1 is a schematic structural diagram of the thermocouple assembly provided by the embodiment of the present invention.

[0039] Figure 2 is Figure 1 A partially sectional enlarged schematic view of A.

[0040] Reference numerals:

[0041] 1. Rhenium-iridium sleeve; 2. Temperature measuring component; 3. Insulating part; 4. Adapter pipe;

[0042] 11. First mounting hole; 12. Rhenium material layer; 13. Iridium material layer;

[0043] 21. Plug; 22. Thermocouple wire. Detailed implementation mode

[0044] The following combines Figures 1 to 2 to elaborate more details on the technical solutions provided by the present invention. The description of the exemplary embodiments is merely illustrative and shall in no way be construed as any limitation to the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments introduced here. These embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0045] The "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements.

[0046] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to other devices without an intermediate device, or may not be directly connected to other devices but have an intermediate device.

[0047] All terms used in the present disclosure (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary such as should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0048] For technologies, methods and devices known to those of ordinary skill in the relevant art, they may not be discussed in detail, but in appropriate cases, the technologies, methods and devices are regarded as part of the specification.

[0049] The dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. In each drawing, the same reference numerals are attached to common structural elements or structural elements of the same type, and repeated descriptions thereof are appropriately omitted.

[0050] See Figure 1 and Figure 2 Referring to Figure 1 and Figure 2 , an embodiment of the present invention provides a thermocouple assembly, including a rhenium-iridium sleeve 1, a temperature measuring assembly 2, and an insulating member 3. The rhenium-iridium sleeve 1 includes a first mounting hole 11; the wall of the first mounting hole 11 includes a rhenium material layer 12 and an iridium material layer 13 attached to the outside of the rhenium material layer 12. The temperature measuring assembly 2 includes a plug 21 and a thermocouple wire 22 connected to the plug 21; one end of the thermocouple wire 22 away from the plug 21 is located in the first mounting hole 11 of the rhenium-iridium sleeve 1. The end of the thermocouple wire 22 away from the plug 21 abuts against the inner wall of the first mounting hole 11. The insulating member 3 is located inside the rhenium-iridium sleeve 1, and the insulating member 3 is located between the inner wall of the rhenium-iridium sleeve 1 and the thermocouple wire 22.

[0051] The thermocouple wire 22 can be made of tungsten-rhenium material, WRe26-WRe5. The diameter of the thermocouple wire 22 is, for example, 0.25 mm to 0.38 mm, specifically, for example, 0.25 mm, 0.30 mm, 0.35 mm, 0.38 mm. With the diameter of the thermocouple wire 22 within the above parameter range, on the premise of ensuring the strength of the thermocouple wire 22, the thermocouple wire 22 can be made as thin as possible, greatly improving the temperature measurement response speed. Only the end of the thermocouple wire 22 away from the plug 21 (this end is also called the hot junction) contacts the inner wall of the rhenium-iridium sleeve 1, and the other parts of the thermocouple wire 22 do not contact the inner wall of the rhenium-iridium sleeve 1. Such a setting enables the temperature at the combustion chamber outlet to be transmitted to the thermocouple wire 22 through the rhenium-iridium sleeve 1, ensuring accurate measurement of the temperature at the combustion chamber outlet.

[0052] The rhenium-iridium sleeve 1 includes two layers of materials: a rhenium material layer 12 and an iridium material layer 13. The rhenium material layer 12 is pure rhenium, and at 2000 °C, the tensile strength of the rhenium material layer 12 is 30 MPa. The iridium material layer 13 is pure iridium, and at 2000 °C, the tensile strength of the iridium material layer 13 is 80 MPa. It can be seen that the rhenium-iridium sleeve 1 can withstand high-temperature gas temperatures above 2300 K, withstand high-temperature gas erosion, and at the same time play a role in oxidation protection and thermal protection for the thermocouple wire 22. It has reliable strength at high temperatures, can withstand the test vibration environment, and improves the service life of the thermocouple. The rhenium-iridium sleeve 1 is heat-resistant. Even if the temperature in the area to be measured (such as the temperature at the combustion chamber outlet) reaches above 2300 K, it can still normally achieve temperature measurement, broadening the temperature measurement application scenario of the thermocouple assembly.

[0053] In some embodiments, the thickness of the rhenium material layer 12 is 0.15 mm to 0.30 mm, specifically, for example, 0.15 mm, 0.18 mm, 0.20 mm, 0.25 mm, 0.28 mm, 0.30 mm. The rhenium material layer 12 is made of pure rhenium instead of an alloy, ensuring the structural strength of the rhenium-iridium sleeve 1.

[0054] The thickness of the iridium material layer 13 is 0.10 mm to 0.20 mm, specifically, for example, 0.10 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.20 mm. The iridium material layer 13 is made of pure iridium instead of an alloy, taking into account both the structural strength and oxidation resistance of the rhenium-iridium sleeve 1.

[0055] The rhenium-iridium sleeve 1 has extremely small dimensions and an extremely thin thickness, enabling the preparation of a thermocouple assembly with a small diameter of 2.5 mm. After the thermocouple assembly is installed into the thermocouple wire 22, it can meet the temperature measurement requirements of components and regions with different structures, shapes, and sizes at multiple points at the outlet of the combustion chamber test piece.

[0056] In some embodiments, the wall thickness of the rhenium-iridium sleeve 1 is 0.25 mm to 0.50 mm, specifically, for example, 0.25 mm, 0.30 mm, 0.40 mm, 0.50 mm. The rhenium-iridium sleeve 1 is very thin, with a fast temperature measurement response speed and high measurement efficiency.

[0057] The outer diameter of the rhenium-iridium sleeve 1 is 2.5 mm to 3.0 mm, specifically, for example, 2.5 mm, 2.8 mm, 3.0 mm. The rhenium-iridium sleeve 1 has extremely small dimensions, enabling temperature measurement in irregular and narrow spaces.

[0058] See Figure 2 , the rhenium-iridium sleeve 1 includes a closed end and an open end; the end of the thermocouple wire 22 away from the plug 21 is configured as a spherical thermal contact and abuts against the inner wall of the closed end of the rhenium-iridium sleeve 1.

[0059] One end of the rhenium-iridium sleeve 1 is closed and the other end is open. The closed end is used to be directly placed in the area where the temperature needs to be measured, and the open end enables the thermocouple wire 22 of the temperature measurement assembly 2 to be inserted into the rhenium-iridium sleeve 1. After the thermocouple wire 22 is inserted, the rhenium-iridium sleeve 1 can be directly fixedly connected to the plug 21 of the temperature measurement assembly 2, or other components can be arranged between the rhenium-iridium sleeve 1 and the temperature measurement assembly 2, such as the adapter tube 4 introduced later. Then, one end of the adapter tube 4 is fixed to the rhenium-iridium sleeve 1 and the other end is fixed to the plug 21 of the temperature measurement assembly 2. The rhenium-iridium sleeve 1 has small dimensions and is difficult to fabricate. Setting the adapter tube 4 can more conveniently arrange the temperature measurement assembly 2 in a lower-temperature area and also facilitate the plug 21 of the temperature measurement assembly 2 to be plugged into the corresponding component.

[0060] See Figure 2, the adapter tube 4 can be made of heat-resistant metal material. One end of the adapter tube 4 is fixedly connected to the rhenium-iridium sleeve 1, and the other end of the adapter tube 4 is fixedly connected to the temperature measuring component 2; the adapter tube 4 includes a second mounting hole (not shown in the figure), and the end of the thermocouple wire 22 away from the plug 21 extends into the first mounting hole 11 through the second mounting hole. The first mounting hole 11 and the second mounting hole are communicated and sealed. The length of the adapter tube 4 can be set as required. The rhenium-iridium sleeve 1 is located in a high-temperature area with extremely high temperature, while the plug 21 of the temperature measuring component 2 is located in a low-temperature area. The adapter tube 4 plays a connecting role, not only making the rhenium-iridium sleeve 1 can be set shorter, reducing the cost and processing difficulty, but also taking into account the installation and temperature measurement requirements of the temperature measuring component 2.

[0061] See Figure 2 , the closed end of the rhenium-iridium sleeve 1 is configured to be tapered, and the tip angle α of the closed end of the rhenium-iridium sleeve 1 is 55° to 65°, specifically such as 55°, 60°, 65°. Setting the closed end of the rhenium-iridium sleeve 1 to be tapered can reduce the influence of the armored structure on the time constant, shorten the temperature measurement response time of the thermocouple component, and improve the response speed of the thermocouple component for temperature measurement.

[0062] See Figure 2 , in some embodiments, along the length direction of the rhenium-iridium sleeve 1, a plurality of insulating members 3 are dispersedly arranged. The insulating members 3 are not a whole, but independent ones. On the one hand, it is convenient to install the insulating members 3 and the thermocouple wire 22, and on the other hand, it also makes the quality of the thermocouple component very light. Since the length of the rhenium-iridium sleeve 1 of the thermocouple component is generally about 100 mm, and a plurality of insulating members 3 are used, the length dimension of each insulating member 3 is very small, and the total weight of all the insulating members 3 is very light, which will not bring a load-bearing burden to the rhenium-iridium sleeve 1, and also makes the thermocouple component more lightweight and more convenient for installation and use.

[0063] The insulating member 3 is made of hafnium oxide ceramic tube. Ensure that in a high-temperature gas environment above 2300K, the insulating member 3 can also reliably play an insulating role.

[0064] In some embodiments, a protective gas is introduced into the first mounting hole 11 and the second mounting hole. The protective gas includes argon. High-purity argon is sealed in the first mounting hole 11 and the second mounting hole, so that the thermocouple wire 22 in the sleeve can work reliably.

[0065] In some embodiments, the end of the second mounting hole away from the first mounting hole 11 is sealed with a sealant. The sealant specifically includes epoxy resin glue. The epoxy resin glue seals the first mounting hole 11 and the second mounting hole to form a sealed cavity, and the cavity is filled with high-purity argon, so that the thermocouple wire 22 in the sleeve is protected by argon and can be reliably measured.

[0066] An embodiment of the present invention further provides a method for preparing a thermocouple assembly, including the following steps:

[0067] Step 1: Prepare a rhenium-iridium sleeve 1.

[0068] Specifically, the rhenium-iridium sleeve 1 can be prepared by the following method: deposit a rhenium material layer 12 on the surface of the substrate; deposit an iridium material layer 13 outside the rhenium material layer 12 deposited on the surface of the graphite mandrel; remove the graphite mandrel to obtain the rhenium-iridium sleeve 1. By using the above method, the rhenium-iridium sleeve 1 with extremely small dimensions can be reliably prepared. The substrate includes a graphite mandrel. The graphite mandrel has good support strength and is convenient for subsequent removal to form a hollow rhenium-iridium sleeve 1.

[0069] In some embodiments, after step a, it further includes: welding and fixing the rhenium-iridium sleeve 1 to the adapter tube 4, and making the rhenium-iridium sleeve 1 and the adapter tube 4 be hermetically connected and fixed; fixing the adapter tube 4 to the plug 21 of the temperature measuring assembly 2. To save manufacturing costs, a high-temperature alloy adapter tube 4 is used to extend the tail end of the rhenium-iridium sleeve 1 to the low-temperature area for sealing treatment.

[0070] Step 2: Sheath the thermocouple wire 22 of the temperature measuring assembly 2 with an insulating member 3 to obtain a thermocouple wire 22 assembly. There are multiple insulating members 3, and the multiple insulating members 3 are dispersedly arranged along the length direction of the thermocouple wire 22. The insulating member 3 with this structure takes into account the requirements of multiple aspects such as installation efficiency, insulation effect, and lightweight of the thermocouple assembly.

[0071] Step 3: Insert the thermocouple wire 22 assembly into the first mounting hole 11 of the rhenium-iridium sleeve 1, so that the hot junction of the thermocouple wire 22 abuts against the bottom of the first mounting hole 11. The temperature in the area to be measured is transmitted to the hot junction of the thermocouple wire 22 through the rhenium-iridium sleeve 1 and is collected; then the temperature signal is transmitted along the thermocouple wire 22 to the temperature collection component connected to the plug of the temperature measuring assembly 2.

[0072] After the step of inserting the thermocouple wire 22 assembly into the rhenium-iridium sleeve 1, the following step d is further included: introducing a protective gas into the first mounting hole 11 of the rhenium-iridium sleeve 1; sealing the rhenium-iridium sleeve 1. Introducing the protective gas enables the thermocouple wire 22 to work in an oxygen-isolated environment. In order to introduce high-purity argon gas into the rhenium-iridium sleeve 1 and the adapter tube 4, the rhenium-iridium sleeve 1 and the adapter tube 4 can be first placed in a vacuum environment to pump out the air inside the rhenium-iridium sleeve 1 and the adapter tube 4; then the rhenium-iridium sleeve 1 and the adapter tube 4 are placed in a high-purity argon gas environment, and then encapsulated to isolate the rhenium-iridium sleeve 1 and the adapter tube 4 from the external atmosphere.

[0073] The following introduces some specific preparation methods.

[0074] a) Connect the rhenium-iridium sleeve 1 and the adapter tube 4 by high-temperature brazing, and check the airtightness of the weld. The pressure for airtightness inspection shall not be lower than 0.7 MPa. The material of the adapter tube 4 is a high-temperature-resistant alloy.

[0075] b) Insert the thermocouple wire 22 into the through-hole of the hafnium oxide ceramic tube of the insulator 3 to obtain a thermocouple wire assembly.

[0076] c) Insert the thermocouple wire assembly into the rhenium-iridium sleeve 1 and the adapter tube 4 after welding in step a), and check the insulation of the thermocouple wire 22 to ensure that the hot junction of the thermocouple wire 22 abuts against the bottom of the first mounting hole 11 of the rhenium-iridium sleeve 1.

[0077] d) Place the assembly in step c) as a whole in a vacuum chamber, and the required vacuum degree shall be better than 0.1 bar.

[0078] e) Introduce high-purity argon gas into the vacuum chamber. The pressure difference between the inflation pressure and the pressure of the vacuum chamber shall not be less than 1 atm to ensure that the rhenium-iridium sleeve 1 and the adapter tube 4 are filled with high-purity argon gas.

[0079] f) Open the top cover of the vacuum chamber, keep the high-purity argon gas continuously introduced, and use epoxy resin glue to encapsulate the tail of the armored thermocouple, that is, the end of the adapter tube 4 far from the rhenium-iridium sleeve 1.

[0080] g) Take out the armored thermocouple after the glue has cured. The glue curing time shall be not less than 24 h at room temperature to ensure the tightness of the encapsulation.

[0081] h) Check the insulation and conduction performance of the thermocouple, judge whether the measuring point is intact and whether the hot junction touches the bottom, and finally obtain a thermocouple assembly with performance meeting the requirements.

[0082] The thermocouple assembly obtained by the above technical solution can meet the temperature measurement requirements in an environment above 2300 K, and the size of the rhenium-iridium sleeve 1 of the thermocouple assembly can be set very small to meet the temperature measurement requirements of different environments.

[0083] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection content of the present invention. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0084] In the description of the present invention, under feasible circumstances, each technical feature can be combined with other technical features.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermocouple assembly, characterized in that, Comprising: A rhenium-iridium sleeve (1), including a first mounting hole (11); the wall of the first mounting hole (11) includes a rhenium material layer (12) and an iridium material layer (13) attached to the outside of the rhenium material layer (12); A temperature measuring assembly (2), including a plug (21) and a thermocouple wire (22) connected to the plug (21); one end of the thermocouple wire (22) away from the plug (21) is located in the first mounting hole (11) of the rhenium-iridium sleeve (1), and the end of the thermocouple wire (22) away from the plug (21) abuts against the inner wall of the first mounting hole (11); and An insulating member (3), located inside the rhenium-iridium sleeve (1), and the insulating member (3) is located between the inner wall of the rhenium-iridium sleeve (1) and the thermocouple wire (22).

2. The thermocouple assembly according to claim 1, wherein, The rhenium-iridium sleeve (1) includes a closed end and an open end; one end of the thermocouple wire (22) away from the plug (21) is configured as a spherical hot junction and abuts against the inner wall of the closed end of the rhenium-iridium sleeve (1).

3. The thermocouple assembly according to claim 2, characterized in that, The closed end of the rhenium-iridium sleeve (1) is configured as a sharp cone, and the tip angle of the closed end of the rhenium-iridium sleeve (1) is 55° to 65°.

4. The thermocouple assembly according to claim 1, wherein Along the length direction of the rhenium-iridium sleeve (1), a plurality of the insulating members (3) are dispersedly arranged.

5. The thermocouple assembly according to claim 1, wherein Also comprising: An adapter pipe (4), one end of which is fixedly connected to the rhenium-iridium sleeve (1), and the other end of which is fixedly connected to the temperature measuring assembly (2); the adapter pipe (4) includes a second mounting hole, and one end of the thermocouple wire (22) away from the plug (21) extends into the first mounting hole (11) through the second mounting hole; the first mounting hole (11) and the second mounting hole are communicated and sealed.

6. The thermocouple assembly according to claim 5, wherein, A protective gas is introduced into the first mounting hole (11) and the second mounting hole.

7. The thermocouple assembly according to claim 6, characterized in that, The protective gas includes argon.

8. The thermocouple assembly according to claim 5, wherein The end of the second mounting hole away from the first mounting hole (11) is sealed with a sealant.

9. The thermocouple assembly according to claim 8, wherein The sealant includes epoxy resin glue.

10. The thermocouple assembly according to claim 1, wherein, The wall thickness of the rhenium-iridium sleeve (1) is 0.25 mm to 0.50 mm; and / or, the outer diameter of the rhenium-iridium sleeve (1) is 2.5 mm to 3.0 mm; and / or, the diameter of the thermocouple wire (22) is 0.25 mm to 0.38 mm.

11. The thermocouple assembly according to claim 10, wherein, The thickness of the rhenium material layer (12) is 0.15 mm to 0.30 mm; and / or, the thickness of the iridium material layer (13) is 0.10 mm to 0.20 mm.

12. The thermocouple assembly according to claim 1, wherein, The insulating member (3) includes a hafnium oxide ceramic tube.

13. A method for preparing a thermocouple component, characterized in that, Including the following steps: Preparing the rhenium-iridium sleeve (1); Putting an insulating member (3) outside the thermocouple wire (22) of the temperature measuring assembly (2) to obtain a thermocouple wire (22) assembly; Inserting the thermocouple wire (22) assembly into the rhenium-iridium sleeve (1).

14. The method for preparing a thermocouple assembly according to claim 13, wherein After the step of inserting the thermocouple wire (22) assembly into the rhenium-iridium sleeve (1), the following steps are further included: Introducing a protective gas into the first mounting hole (11) of the rhenium-iridium sleeve (1); Sealing the rhenium-iridium sleeve (1).

15. The method for preparing a thermocouple assembly according to claim 14, wherein, After the step of preparing the rhenium-iridium sleeve (1), it further includes: Weld and fix the rhenium-iridium sleeve (1) to the adapter pipe (4), and make the rhenium-iridium sleeve (1) be hermetically connected and fixed to the adapter pipe (4); Fix the adapter pipe (4) to the plug (21) of the temperature measuring component (2).

16. The method for preparing a thermocouple assembly according to claim 13, wherein, The preparation of the rhenium-iridium sleeve (1) comprises the following steps: Deposit a rhenium material layer (12) on the surface of the substrate; Deposit an iridium material layer (13) outside the rhenium material layer (12) deposited on the surface of the graphite mandrel; Remove the graphite mandrel to obtain the rhenium-iridium sleeve (1).

17. The method for preparing a thermocouple assembly according to claim 16, wherein, The substrate includes a graphite mandrel.

Images