Sleeve structure of thermocouple

Abstract

The utility model provides a sleeve structure of a thermocouple, which comprises an outer sleeve and at least three inner sleeves arranged in the middle of the outer sleeve along the length direction of the outer sleeve, and the outer sleeve and the inner sleeves are molybdenum tubes; the at least three inner sleeves are mutually fixed through fixing pieces, a thermocouple wire is placed in the middle of the inner sleeve, and the thickness of the outer sleeve is larger than that of the inner sleeve. According to the utility model, through the specific design of the outer sleeve and the inner sleeve, the sleeve structure does not pollute the thermocouple wire, the problem of thermocouple oxidation caused by damp does not exist, the assembly clearance is reduced, the thermocouple wire is effectively protected, the exhaust shaking and mutual collision are avoided, the cost of the thermocouple wire is reduced, and the thermocouple is simple in structure and suitable for popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermocouple protection and relates to a sleeve structure of a thermocouple. Background Art

[0002] Hot isostatic pressing is a process that uses equal static pressure at high temperature to press. This method is often used for powder sintering, material densification, diffusion welding, etc. Its advantage is that it combines the advantages of hot pressing and isostatic pressing, but the equipment is expensive and the productivity is low. In the hot isostatic press, the thermocouple is an indispensable key component.

[0003] The prior art solution discloses a molybdenum-copper composite hot pressing head, including a main heating zone, a thermocouple is arranged on the left side of the main heating zone, a temperature sensing wire fixing plate is arranged on the front end outer wall of the main heating zone, a high-temperature sleeve is arranged on the inner wall of the temperature sensing wire fixing plate, and the thermocouple wire harness in the thermocouple passes through the inner wall of the high-temperature sleeve, a soldering zone is arranged at the bottom of the main heating zone, and the main heating zone adopts a molybdenum matrix alloy.

[0004] The prior art solution also discloses a tungsten-rhenium thermocouple, comprising a molybdenum tube, a corundum tube, a tungsten-rhenium wire, a stainless steel tube, boron nitride powder and resin glue. The molybdenum tube is coaxially fixed on the inner side of the stainless steel tube, one end of the molybdenum tube extends to the outer side of the stainless steel tube, the tungsten-rhenium wire coaxially penetrates the stainless steel tube and extends into the inner cavity of the molybdenum tube, and the outer wall of one end of the tungsten-rhenium wire located inside the stainless steel tube and the molybdenum tube is wrapped with a corundum tube.

[0005] The prior art solution also discloses a method for manufacturing a gasifier thermocouple and a thermocouple protection sleeve thereof. The gasifier thermocouple includes a thermocouple and a thermocouple protection sleeve sleeved outside the thermocouple. The thermocouple protection sleeve includes a middle non-metallic protection tube, an inner metal protection tube, and an outer metal protection tube. The non-metallic protection tube is formed by pressureless sintering of submicron silicon carbide powder, and the inner metal protection tube and the outer metal protection tube are respectively smelted from alloys. There are bonding layers between the non-metallic protection tube and the outer metal protection tube and the inner metal protection tube, and a protective layer is provided on the outer surface of the outer metal protection tube.

[0006] However, the existing thermocouple sleeves still have the problem that the graphite used will volatilize at high temperatures, which will cause contamination of the internal thermocouple wire, resulting in inaccurate temperature and deformity, hardening, and breakage; it is easy to be affected by moisture, and moisture at high temperatures will cause oxidation of the thermocouple wire, resulting in damage to the thermocouple; and the assembly gap is too large, which is easy to cause collisions during the gas discharge stage, resulting in damage to the thermocouple wire. Therefore, it is urgent to design and develop a thermocouple sleeve structure that overcomes the defects of the existing technology to meet the needs of actual applications. Utility Model Content

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a sleeve structure for a thermocouple. In the present invention, through the specific design of the outer sleeve and the inner sleeve, the sleeve structure will not contaminate the thermocouple wire, and there will be no problem of thermocouple oxidation caused by moisture. The assembly gap is reduced, the thermocouple wire is effectively protected, the exhaust gas is prevented from shaking and colliding with each other, and the cost of the thermocouple wire is reduced. The structure is simple and suitable for promotion.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a sleeve structure of a thermocouple, which comprises an outer sleeve and at least three inner sleeves centrally arranged in the outer sleeve along the length direction of the outer sleeve, wherein both the outer sleeve and the inner sleeve are molybdenum tubes; at least three inner sleeves are fixed to each other by fixing parts, and a thermocouple wire is centrally placed in the inner sleeve, and the thickness of the outer sleeve is greater than that of the inner sleeve.

[0010] In the utility model, through the specific design of the outer sleeve and the inner sleeve, the sleeve structure will not contaminate the thermocouple wire, and there is no problem of thermocouple oxidation caused by moisture. The assembly gap is reduced, the thermocouple wire is effectively protected, the exhaust gas is prevented from shaking and colliding with each other, the cost of the thermocouple wire is reduced, the structure is simple, and it is suitable for promotion.

[0011] It should be noted that the “at least three” in the present invention may be, for example, 3, 4, 5, 6, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0012] It should be noted that the molybdenum tube is used in the present invention because the melting point of molybdenum is as high as 2620°C. Compared with existing graphite, steel, etc., it has good high temperature performance and corrosion resistance, and is very suitable for high temperature use conditions of hot isostatic pressing.

[0013] It should be noted that in the present invention, the thickness of the outer sleeve is greater than that of the inner sleeve, which can better protect the inner sleeve and the thermocouple wire, and can also reduce the overall size of the sleeve and increase the loading amount. If it is not set in this way, that is, the thickness of the two is the same, or the thickness of the outer sleeve is less than that of the inner sleeve, the outer sleeve will be easily bent or broken. This is because the outer sleeve is the first line of defense against contact with the outside world, and is mainly used to protect against collisions and bending at high temperatures. In a limited space, ensuring that the wall thickness of the outer sleeve is as thick as possible can effectively protect the inner sleeve and the thermocouple wire.

[0014] As a preferred technical solution of the present invention, the inner diameter of the outer sleeve is 16-17 mm, for example, it can be 16 mm, 16.1 mm, 16.2 mm, 16.3 mm, 16.4 mm, 16.5 mm, 16.6 mm, 16.7 mm, 16.8 mm, 16.9 mm, 17 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] As a preferred technical solution of the present invention, the outer diameter of the outer sleeve is 20-21 mm, for example, it can be 20 mm, 20.1 mm, 20.2 mm, 20.3 mm, 20.4 mm, 20.5 mm, 20.6 mm, 20.7 mm, 20.8 mm, 20.9 mm, 21 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] In the utility model, the inner diameter of the outer sleeve is 16-17 mm and the outer diameter is 20-21 mm, because within this range, the wall thickness of the outer sleeve is sufficient to protect against accidental collisions and bending at high temperatures. If it is not within this range, it will lead to reduced loading space or insufficient strength, because too thick a tube wall will take up too much loading space, and too thin a tube wall will cause insufficient strength.

[0017] As a preferred technical solution of the present invention, the length of the outer sleeve is 2400-2500mm, for example, it can be 2400mm, 2410mm, 2420mm, 2430mm, 2440mm, 2450mm, 2460mm, 2470mm, 2480mm, 2490mm, 2500mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] As a preferred technical solution of the present invention, the inner diameter of the inner sleeve is 4.5-4.6 mm, for example, it can be 4.5 mm, 4.51 mm, 4.52 mm, 4.53 mm, 4.54 mm, 4.55 mm, 4.56 mm, 4.57 mm, 4.58 mm, 4.59 mm, 4.6 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] As a preferred technical solution of the utility model, the outer diameter of the inner sleeve is 6.5-6.6 mm, for example, it can be 6.5 mm, 6.51 mm, 6.52 mm, 6.53 mm, 6.54 mm, 6.55 mm, 6.56 mm, 6.57 mm, 6.58 mm, 6.59 mm, 6.6 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] In the utility model, the inner diameter of the inner sleeve is 4.5-4.6 mm and the outer diameter is 6.5-6.6 mm, because within this range, the outer sleeve and the thermocouple wire can be better matched. If it is not within this range, the thermocouple wire and the inner sleeve will shake, increasing the risk of collision. This is because if the inner diameter is too large, it cannot match the size of the thermocouple, and if the outer diameter is too large, it cannot fit tightly with the outer sleeve, and in order to ensure a certain strength of the inner sleeve.

[0021] As a preferred technical solution of the utility model, the length of the inner sleeve is 2400-2500mm, for example, it can be 2400mm, 2410mm, 2420mm, 2430mm, 2440mm, 2450mm, 2460mm, 2470mm, 2480mm, 2490mm, 2500mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] As a preferred technical solution of the present invention, the distance between the outer side of the inner sleeve and the inner side of the outer sleeve is 1 to 1.2 mm, for example, it can be 1 mm, 1.02 mm, 1.04 mm, 1.06 mm, 1.08 mm, 1.1 mm, 1.12 mm, 1.14 mm, 1.16 mm, 1.18 mm, 1.2 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] In the utility model, the distance between the outer side of the inner sleeve and the inner side of the outer sleeve is 1 to 1.2 mm. This is because within this range, the inner sleeve can be tightly fitted into the outer sleeve after the molybdenum wire is tied and fixed. If it is not within this range, there will be a gap between the inner and outer sleeves. This is because this distance is matched with the thickness of the molybdenum wire. If it is too large or too small, it will cause inconvenience in molybdenum wire bundling.

[0024] As a preferred technical solution of the utility model, the fixing piece is a molybdenum wire.

[0025] As a preferred technical solution of the utility model, the thickness of the molybdenum wire is 1 to 1.1 mm, for example, it can be 1 mm, 1.01 mm, 1.02 mm, 1.03 mm, 1.04 mm, 1.05 mm, 1.06 mm, 1.07 mm, 1.08 mm, 1.09 mm, 1.1 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] It should be noted that the utility model uses molybdenum wire to bind and fix the inner sleeve, and the outer sleeve and the inner sleeve are made of the same material, which can prevent material damage caused by different thermal expansion.

[0027] Exemplarily, the method for using the sleeve structure in the utility model includes:

[0028] Insert the three-zone thermocouple wire with insulating ceramic beads into the inner sleeve (make sure the thermocouple wire is about 0.25mm away from the inner wall of the inner sleeve on both sides), bind the three inner sleeves firmly with molybdenum wire, insert them into the outer sleeve and connect them to the cold isostatic press equipment for fixation (the gap between the three inner sleeves and the outer sleeve is about 1mm, and they can be tightly configured with the outer sleeve after binding with molybdenum wire).

[0029] Compared with the prior art, the beneficial effects of the utility model are:

[0030] In the utility model, through the specific design of the outer sleeve and the inner sleeve, the sleeve structure will not contaminate the thermocouple wire, and there is no problem of thermocouple oxidation caused by moisture. The assembly gap is reduced, the thermocouple wire is effectively protected, the exhaust gas is prevented from shaking and colliding with each other, the cost of the thermocouple wire is reduced, the structure is simple, and it is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A cross-sectional view of a sleeve structure provided for a specific embodiment of the utility model;

[0032] Among them, 1-outer casing; 2-inner casing; 3-molybdenum wire. DETAILED DESCRIPTION

[0033] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0035] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0036] In a specific embodiment, the utility model provides a thermocouple sleeve structure, such as Figure 1 As shown, the sleeve structure includes an outer sleeve 1, and at least three inner sleeves 2 centrally arranged in the outer sleeve 1 along the length direction of the outer sleeve 1, and the outer sleeve 1 and the inner sleeve 2 are both molybdenum tubes; at least three inner sleeves 2 are fixed to each other by fixing parts, and the inner sleeve 2 is used to place the electric wire centrally, and the thickness of the outer sleeve 1 is greater than the thickness of the inner sleeve 2.

[0037] It should be noted that the “at least three” in the present invention may be, for example, 3, 4, 5, 6, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0038] It should be noted that the molybdenum tube is used in the present invention because the melting point of molybdenum is as high as 2620°C. Compared with existing graphite, steel, etc., it has good high temperature performance and corrosion resistance, and is very suitable for high temperature use conditions of hot isostatic pressing.

[0039] Furthermore, the inner diameter of the outer sleeve 1 is 16-17 mm, for example, it can be 16 mm, 16.1 mm, 16.2 mm, 16.3 mm, 16.4 mm, 16.5 mm, 16.6 mm, 16.7 mm, 16.8 mm, 16.9 mm, 17 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0040] Furthermore, the outer diameter of the outer sleeve 1 is 20-21 mm, for example, it can be 20 mm, 20.1 mm, 20.2 mm, 20.3 mm, 20.4 mm, 20.5 mm, 20.6 mm, 20.7 mm, 20.8 mm, 20.9 mm, 21 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0041] Furthermore, the length of the outer sleeve 1 is 2400-2500 mm, for example, it can be 2400 mm, 2410 mm, 2420 mm, 2430 mm, 2440 mm, 2450 mm, 2460 mm, 2470 mm, 2480 mm, 2490 mm, 2500 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0042] Furthermore, the inner diameter of the inner sleeve 2 is 4.5-4.6 mm, for example, it can be 4.5 mm, 4.51 mm, 4.52 mm, 4.53 mm, 4.54 mm, 4.55 mm, 4.56 mm, 4.57 mm, 4.58 mm, 4.59 mm, 4.6 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0043] Furthermore, the outer diameter of the inner sleeve 2 is 6.5-6.6 mm, for example, it can be 6.5 mm, 6.51 mm, 6.52 mm, 6.53 mm, 6.54 mm, 6.55 mm, 6.56 mm, 6.57 mm, 6.58 mm, 6.59 mm, 6.6 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0044] Furthermore, the length of the inner sleeve 2 is 2400-2500 mm, for example, it can be 2400 mm, 2410 mm, 2420 mm, 2430 mm, 2440 mm, 2450 mm, 2460 mm, 2470 mm, 2480 mm, 2490 mm, 2500 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0045] Furthermore, the distance between the outer side of the inner sleeve 2 and the inner side of the outer sleeve 1 is 1 to 1.2 mm, for example, it can be 1 mm, 1.02 mm, 1.04 mm, 1.06 mm, 1.08 mm, 1.1 mm, 1.12 mm, 1.14 mm, 1.16 mm, 1.18 mm, 1.2 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0046] Furthermore, the fixing piece is a molybdenum wire 3 .

[0047] Furthermore, the thickness of the molybdenum wire 3 is 1 to 1.1 mm, for example, it can be 1 mm, 1.01 mm, 1.02 mm, 1.03 mm, 1.04 mm, 1.05 mm, 1.06 mm, 1.07 mm, 1.08 mm, 1.09 mm, 1.1 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0048] It should be noted that the utility model uses molybdenum wire 3 to bind and fix the inner sleeve 2, and the outer sleeve 1 and the inner sleeve 2 are made of the same material, which can prevent material damage caused by different thermal expansion.

[0049] Exemplarily, the method for using the sleeve structure in the utility model includes:

[0050] Insert the three-zone thermocouple wire with insulating ceramic beads into the inner sleeve 2 (make sure the thermocouple wire is about 0.25mm away from the inner wall of the inner sleeve 2 on both sides), firmly bind the three inner sleeves 2 with molybdenum wire 3, and insert them into the outer sleeve 1 to connect to the cold isostatic pressing machine equipment and fix them (the gap between the three inner sleeves 2 and the outer sleeve 1 is about 1mm, and after bundling the molybdenum wire 3, they can be tightly configured with the outer sleeve 1).

[0051] Example 1

[0052] This embodiment provides a thermocouple sleeve structure, wherein:

[0053] The sleeve structure includes an outer sleeve 1 and three inner sleeves 2 centrally arranged in the outer sleeve 1 along the length direction of the outer sleeve 1. The outer sleeve 1 and the inner sleeve 2 are both molybdenum tubes; the three inner sleeves 2 are fixed to each other by molybdenum wires 3, and the inner sleeve 2 is used to centrally place the electric wire, and the thickness of the outer sleeve 1 is greater than that of the inner sleeve 2.

[0054] The inner diameter of the outer sleeve 1 is 16 mm, the outer diameter of the outer sleeve 1 is 20 mm, and the length of the outer sleeve 1 is 2400 mm.

[0055] The inner diameter of the inner sleeve 2 is 4.5 mm, the outer diameter of the inner sleeve 2 is 6.5 mm, and the length of the inner sleeve 2 is 2400 mm.

[0056] The distance between the outer side of the inner sleeve 2 and the inner side of the outer sleeve 1 is 1 mm. The thickness of the molybdenum wire 3 is 1 mm.

[0057] In summary, the utility model adopts the specific design of the outer sleeve 1 and the inner sleeve 2, so that the sleeve structure will not contaminate the thermocouple wire, and there is no problem of thermocouple oxidation caused by moisture. It also reduces the assembly gap, effectively protects the thermocouple wire, avoids exhaust shaking and collision, reduces the cost of the thermocouple wire, has a simple structure, and is suitable for promotion.

[0058] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. A thermocouple sheath structure, characterized in that: The sleeve structure comprises an outer sleeve, and at least three inner sleeves centrally arranged in the outer sleeve along the length direction of the outer sleeve, and both the outer sleeve and the inner sleeve are molybdenum tubes; At least three of the inner sleeves are fixed to each other through a fixing piece, and the inner sleeve is used to centrally place the galvanic wire, and the thickness of the outer sleeve is greater than that of the inner sleeve.

2. The sheath structure of the thermocouple according to claim 1, characterized in that: The inner diameter of the outer sleeve is 16-17 mm.

3. The sheath structure of the thermocouple according to claim 1, characterized in that: The outer diameter of the outer sleeve is 20-21 mm.

4. The sheath structure of the thermocouple according to claim 1, characterized in that: The length of the outer sleeve is 2400-2500 mm.

5. The sheath structure of the thermocouple according to claim 1, characterized in that: The inner diameter of the inner sleeve is 4.5-4.6 mm.

6. The sheath structure of the thermocouple according to claim 1, characterized in that: The outer diameter of the inner sleeve is 6.5-6.6 mm.

7. The sheath structure of the thermocouple according to claim 1, characterized in that: The length of the inner sleeve is 2400-2500 mm.

8. The sheath structure of the thermocouple according to claim 1, characterized in that: The distance between the outer side of the inner sleeve and the inner side of the outer sleeve is 1 to 1.2 mm.

9. The sheath structure of the thermocouple according to claim 1, characterized in that: The fixing piece is a molybdenum wire.

10. The thermocouple sheath structure according to claim 9, characterized in that: The thickness of the molybdenum wire is 1-1.1 mm.

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