Sealing device for temperature measuring equipment and sensor for vacuum sintering furnace

Abstract

The utility model relates to the technical field of temperature measuring equipment sealing, in particular to a sealing device for temperature measuring equipment and a sensor for a vacuum sintering furnace, which are provided with a first connecting piece, a first sealing piece, a second connecting piece and a third connecting piece. The second connecting piece gradually gets close to the first connecting piece to extrude the first sealing piece, through the supporting effect of the third connecting piece, sealing connection between the first sealing piece and the first sealing cavity and between the first sealing piece and the third connecting piece is achieved, and then the connecting position of the first sealing end and the second connecting piece is sealed. The first sealing piece is matched with the first sealing cavity and the third connecting piece for sealing, so that the vacuum degree of the vacuum furnace is not distorted when the protection tube of the sensor is broken, and a heating body and a product in the hearth of the vacuum furnace are not damaged or scrapped; and the whole sealing structure is simple, is locked and fixed through threads, and is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing of temperature measuring equipment, in particular to a sealing device for temperature measuring equipment and a sensor for a vacuum sintering furnace. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] With the rapid development of domestic photovoltaic, semiconductor and other industries, the vacuum degree requirements for vacuum sintering furnaces are getting higher and higher. Domestic sensors (such as thermocouples, thermal resistors, etc.) can no longer meet the current high requirements of vacuum sintering furnaces due to problems with sealing and measurement accuracy. Equipment manufacturers can only purchase sensors from abroad, which not only increases costs, but also increases the purchase cycle.

[0004] At present, many sensors (such as thermocouples, thermal resistors, etc.) used in ultra-high vacuum sintering furnaces, when the protective tube of the sensor is damaged during use, due to the large pressure difference between the inside and outside of the ultra-high vacuum furnace (that is, the negative pressure is very large, and as the vacuum degree increases, the negative pressure value will continue to increase), the general seal can be easily punctured, causing the vacuum degree of the vacuum furnace to fail, and then causing the heating element and product in the vacuum furnace to be damaged or scrapped; and the sealing design of some manufacturers is more complicated, which is not only troublesome to install but also fails to meet the vacuum degree requirements of the vacuum sintering furnace. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a sealing device for temperature measuring equipment, which is provided with a first connecting member, a first sealing member, a second connecting member and a third connecting member. By adjusting the second connecting member, the second connecting member is gradually approached to the first connecting member to squeeze the first sealing member. Through the supporting effect of the third connecting member, the first sealing member and the first sealing cavity, as well as the third connecting member, are sealed and connected, and then the connection between the first sealing end and the second connecting member is sealed. Through the coordinated sealing of the first sealing member, the first sealing cavity and the third connecting member, it is ensured that when the protective tube of the sensor is broken, the vacuum degree of the vacuum furnace is not distorted, thereby ensuring that the heating element and the product in the furnace of the vacuum furnace will not be damaged or scrapped; and the overall sealing structure is single-piece and fixed by thread locking, which is easy to install.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a sealing device for temperature measuring equipment, comprising

[0007] A first connecting member, the first connecting member comprising a first sealing end and a connecting end connected to the measuring body, the first sealing end being provided with a first sealing cavity, the connecting end being provided with a placement cavity, the first sealing cavity being in communication with the placement cavity;

[0008] a first seal;

[0009] A second connecting member, wherein a second sealing cavity is arranged at one end of the second connecting member, the first sealing end extends into the second sealing cavity and is connected to the second connecting member, one end of the first sealing member is sealedly connected to the first sealing cavity, and the other end is connected to the bottom of the second sealing cavity;

[0010] The third connecting member passes through the first connecting member, the first sealing member and the second connecting member in sequence and is fixedly connected to the second connecting member; the first sealing member is sealed and connected to the first sealing cavity and the third connecting member by adjusting the second connecting member.

[0011] The utility model provides a sealing device for temperature measuring equipment, wherein the first sealing member comprises a first sealing part and a first holding part, and the first sealing member is an integrated structure; one end of the first holding part is fixedly connected to an end of the first sealing member with a larger cross-sectional diameter, and the other end of the first holding part is connected to a second sealing cavity, and the first holding part is sealedly connected to the first sealing cavity; the second connecting member is adjusted, and when the first connecting member gradually approaches the second connecting member, the first holding part squeezes the first sealing part, so that the first sealing member is sealedly connected to the first sealing cavity and the third connecting member, and under the pressure of the first holding part, the first sealing part is deformed, and the first sealing part is supported by the third connecting member, so that the first sealing part is surface-sealed with the first sealing cavity and the third connecting member, thereby ensuring a better sealing effect.

[0012] The utility model provides a sealing device for temperature measuring equipment, wherein the first sealing cavity is a conical mouth, and the first sealing part is a conical body matching the first sealing cavity, wherein the first sealing part matches the shape and size of the first sealing cavity, and the connection is reliable, thereby achieving a better sealing effect, wherein the taper of the first end seal and the second end seal is between 40 degrees and 65 degrees, and the sealing effect is optimal.

[0013] The utility model provides a sealing device for temperature measuring equipment, wherein the first sealing member comprises a second sealing part and a second holding part, the second sealing part is a cylinder matching the first sealing cavity, the second sealing part is arranged in the first sealing cavity, and the second holding part is arranged in the second sealing cavity; the second connecting member is adjusted, and when the first connecting member gradually approaches the second connecting member, the second holding part holds the second sealing part, so that the second sealing part is sealed and connected with the first sealing cavity and the third connecting member; under the holding of the second holding part, the second sealing part is deformed, and the support of the second sealing part by the third connecting member makes the second sealing part realize surface sealing with the first sealing cavity and the third connecting member, thereby ensuring a better sealing effect.

[0014] The utility model provides a sealing device for a temperature measuring device, wherein the second pressing portion comprises a supporting end and a driving end, the supporting end is connected to the bottom of the second sealing cavity, the driving end is provided with a third sealing cavity, the third sealing cavity is arranged axially, and the cross-sectional diameter gradually decreases from the outside to the inside, the second pressing portion is axially arranged for passing through a second through hole of a third connecting member, the second through hole is communicated with the third sealing cavity; the driving end is sealed and connected to the second sealing portion.

[0015] The utility model provides a sealing device for temperature measuring equipment, which also includes a second sealing member, wherein the third connecting member is provided with a first through hole along the axial direction, the third connecting member includes a limiting end and a second sealing end, the limiting end is connected to the bottom of the placement cavity to limit the third connecting member, the second sealing end is successively passed through the second connecting member and fixedly connected to the second sealing member, the second sealing member is fixedly connected to the first through hole of the second sealing end, the second sealing member is extended into the first through hole of the second sealing end, and the second sealing end is mechanically pressed to fix the second sealing member, so as to avoid that when the protective tube is broken, the negative pressure in the furnace will impact the second sealing member and cause the sealing member to fall off.

[0016] The utility model provides a sealing device for temperature measurement equipment, wherein the outer surface of the first sealing end is provided with threads, the inner wall of the second sealing cavity is provided with threads, and the second connecting piece is connected to the first connecting piece through threads, and the second connecting piece is rotated so that the second connecting piece gradually approaches the first connecting piece to squeeze the first sealing piece to seal the connection between the first sealing end and the third connecting piece, which is easy to operate; through the threaded connection, it is convenient to adjust the pressure of the first sealing piece externally, so as to ensure that the pressure of the first sealing piece can be accurately adjusted according to the vacuum degree in the vacuum furnace during the debugging process, so as to ensure the best sealing effect.

[0017] A sensor for a vacuum sintering furnace comprises a sealing device for a temperature measuring device, a detection unit, a terminal, and a protective tube. The detection unit is arranged in the protective tube and connected to the terminal through the sealing device for the temperature measuring device. The protective tube is fixedly connected to a first connecting piece.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a sealing device for temperature measuring equipment, which includes a first connecting member, a first sealing member, a second connecting member and a third connecting member. By adjusting the second connecting member, the second connecting member gradually approaches the first connecting member to squeeze the first sealing member. Through the supporting effect of the third connecting member, the first sealing member and the first sealing cavity, as well as the third connecting member, are sealed and connected, thereby sealing the connection between the first sealing end and the second connecting member. Through the coordinated sealing of the first sealing member, the first sealing cavity and the third connecting member, it is ensured that when the protective tube of the sensor is broken, the vacuum degree of the vacuum furnace is not distorted, thereby ensuring that the heating element and the product in the furnace of the vacuum furnace will not be damaged or scrapped. The overall sealing structure is single-piece and fixed by threaded locking, which is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a first structural schematic diagram of a sealing device for a temperature measuring device of the utility model;

[0020] Figure 2 for Figure 1 A schematic structural diagram of the first sealing member;

[0021] Figure 3 This is a second structural schematic diagram of a sealing device for a temperature measuring device of the utility model;

[0022] Figure 4 for Figure 3 A schematic structural diagram of the first sealing member;

[0023] Figure 5 The utility model is a sensor for vacuum sintering furnace.

[0024] In the figure: a first connecting member 10; a first sealing end 11; a connecting end 12; a first sealing cavity 13; a placement cavity 14; a first sealing member 20; a first sealing portion 21; a first holding portion 22; a second sealing portion 23; a second holding portion 24; a second through hole 25; a supporting end 241; a driving end 242; a third sealing cavity 243; a second connecting member 30; a second sealing cavity 31; a third connecting member 40; a first through hole 41; a limiting end 42; a second sealing end 43; a wiring terminal 50; a protective tube 60; and a second sealing member 70. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the utility model, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model 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 therefore cannot be understood as a limitation on the utility model.

[0027] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0028] At present, the sensors used in domestic ultra-high vacuum sintering furnaces have a vacuum degree of 10-5Pa when the protection tube is damaged, and the sealing effect is not good. When the sensor protection tube is broken, the vacuum furnace will be distorted, and the overall structure of the current sensor sealing mechanism is complex, and the installation and disassembly are uniformly convenient. The technical solution in the embodiment of this application is to solve the above problems. The overall idea is as follows: Figure 1 and Figure 3 As shown, the embodiment of the present application provides a sealing device for a temperature measuring device, which is provided with a first connecting member, a first sealing member, a second connecting member and a third connecting member. By adjusting the second connecting member 30, the second connecting member 30 is gradually approached to the first connecting member 10 to squeeze the first sealing member 20, and the supporting effect of the third connecting member is used to achieve a sealed connection between the first sealing member 20 and the first sealing cavity 13, and the third connecting member 40, thereby sealing the connection between the first sealing end 11 and the second connecting member 30, and the coordinated sealing of the first sealing member 20 and the first sealing cavity 13 and the third connecting member 40 ensures that when the protective tube 60 of the sensor is broken, the vacuum degree of the vacuum furnace is not distorted, thereby ensuring that the heating element and the product in the furnace of the vacuum furnace will not be damaged or scrapped; and the overall sealing structure is single-piece and fixed by thread locking, which is easy to install.

[0029] This design can be used in other sealing detection equipment and sealing equipment.

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1 and Figure 3As shown, a sealing device for a temperature measuring device includes a first connecting member 10, a first sealing member 20, a second connecting member 30 and a third connecting member 40; by rotating the third connecting member 40, the third connecting member 40 is made close to the first connecting member 10 to squeeze the first sealing member, thereby achieving sealing between the first sealing member 20 and the first sealing cavity 13, and the third connecting member 40, thereby ensuring sealing between the first sealing member 10 and the second connecting member 30.

[0032] like Figure 1 and Figure 3 As shown, a sealing device for temperature measurement equipment includes a first connector 10, a first seal 20, a second connector 30 and a third connector 40; the first connector 10 includes a first sealing end 11 and a connecting end 12 connected to a measuring body, the first sealing end 11 is provided with a first sealing cavity 13, the connecting end 12 is provided with a placement cavity 14, and the first sealing cavity 13 is communicated with the placement cavity 14; one end of the second connector 30 is provided with a second sealing cavity 31, the first sealing end 11 extends into the second sealing cavity 31 and is connected to the second connector 30, one end of the first seal 20 is sealed and connected to the first sealing cavity 13, and the other end is sealed and connected to the second sealing cavity 14. The bottom of the sealing cavity 31 is connected; the third connecting member 40 passes through the first connecting member 10, the first sealing member 20 and the second connecting member 30 in sequence, and is fixedly connected to the second connecting member 30; by adjusting the second connecting member 30, the first sealing member 20 is sealed and connected to the first sealing cavity 13 and the third connecting member 40, that is, by adjusting the second connecting member 30, the first connecting member 10 is gradually approached to the second connecting member 30 to squeeze the first sealing member 20, thereby realizing the sealed connection between the first sealing member 20 and the first sealing cavity 13, and the third connecting member 40, and then the connection between the first sealing end 11 and the second connecting member 30 is sealed.

[0033] The third connecting member 40 not only supports the first sealing member 20 , but is also sealedly connected to the first sealing member 20 .

[0034] like Figure 2 As shown, the first sealing member 20 includes a first sealing portion 21 and a first pressing portion 22, and the first sealing member 20 is an integrated structure; one end of the first pressing portion 22 is fixedly connected to the end of the first sealing portion 21 with a larger cross-sectional diameter, and the other end of the first pressing portion 22 is connected to the second sealing cavity 31, and the first pressing portion 22 is sealed and connected to the first sealing cavity 13; the second connecting member 30 is adjusted, and when the first connecting member 10 gradually approaches the second connecting member 30, the first pressing portion 22 squeezes the first sealing portion 21, so that the first sealing member 20 is sealed and connected to the first sealing cavity 13, and the third connecting member 40.

[0035] Preferably, the first sealed cavity 13 is a conical opening, and the first sealing portion 21 is a conical body matching the first sealed cavity 13 , that is, the shape and size of the first sealing portion 21 match the first sealed cavity 13 .

[0036] During assembly, the third connecting member 40 passes through the first connecting member 10 from the placement cavity 14 of the connecting end 12, and the third connecting member 40 is limited by the limiting end 42, and then the first sealing member 20 is inserted from the second sealing end 43, and the second sealing cavity 31 of the second connecting member 30 is threadedly connected with the first sealing end 11 of the first sealing member 10. By rotating the second connecting member 30, the second connecting member 30 gradually approaches the first connecting member 10, and the first sealing portion 21 of the first sealing member 20 is pressed into the first sealing cavity 13 to achieve the sealing of the connection between the first connecting member 10 and the second connecting member 30; finally, the second sealing member 70 is installed in the second sealing end 43, and the second sealing end 43 is pressed and held, so that the third sealing end 43 is mechanically deformed, so as to achieve the sealing of the second sealing member 70 and the second sealing end 43, that is, the sealing of the first through hole 41 of the third connecting member 40.

[0037] like Figure 3 and Figure 4 As shown, the first sealing member 20 includes a second sealing portion 23 and a second holding portion 24, the second sealing portion 23 is a cylinder matching the first sealing cavity 13, the second sealing portion 23 is arranged in the first sealing cavity 13, and the second holding portion 24 is arranged in the second sealing cavity 31; the second connecting member 30 is adjusted, and when the first connecting member 10 gradually approaches the second connecting member 30, the second holding portion 24 holds the second sealing portion 23, so that the second sealing portion 23 is sealed and connected with the first sealing cavity 13 and the third connecting member 40.

[0038] The second pressing portion 24 includes a supporting end 241 connected to the second sealing cavity 31 and a driving end 242 connected to the second sealing portion 23. The supporting end 241 is connected to the bottom of the second sealing cavity 31, and the driving end 242 is provided with a third sealing cavity 243. The third sealing cavity 243 is arranged along the axial direction, and the cross-sectional diameter gradually decreases from the outside to the inside. The second pressing portion 24 is axially provided with a second through hole 25 for passing through the third connecting member 40, and the second through hole 25 is communicated with the third sealing cavity 243; and the cross-sectional diameter of the driving end 242 is 1.1mm. The cross-sectional diameter of the second pressing portion 24 and the cross-sectional diameter of the first sealing cavity 13 are substantially equal, or the cross-sectional diameter of the second pressing portion 24 and the cross-sectional diameter of the first sealing cavity 13 are equal, and the cross-sectional diameter of the driving end 242 is slightly smaller than the cross-sectional diameter of the second pressing portion 24 and the cross-sectional diameter of the first sealing cavity 13. By rotating the second connecting member 30, the second connecting member 30 gradually approaches the first connecting member 10, and the driving end 242 of the second pressing portion 24 presses the second sealing portion 23, so that the second sealing portion 23 is deformed. A portion of the driven end 242 is compressed to seal the connection between the second sealing portion 23 and the first sealing cavity 13, and the connection between the second sealing portion 23 and the third connecting member 40, wherein the second pressing portion 24 is made of a hard metal material, and the second sealing portion 23 is made of a ductile metal material or alloy, or graphene material. Since the second sealing portion 23 made of a ductile metal material or alloy, or graphene material, is compressed and deformed greatly along the direction of the force when it is compressed, the end face of the second pressing portion 24 is mainly pressed against the outer side of the end face of the second sealing portion 23 during pressing, and the second sealing portion 23 is The outer side deformation becomes larger, and the connection between it and the first sealing cavity 13 is sealed very well, while the connection with the third connecting piece 40 is not sealed well in actual use. By designing the end of the second pressing portion 24 as a conical third sealing cavity 243, when the second pressing portion 24 presses the end face of the second sealing portion 23, the deformed second sealing portion 23 will enter the third sealing cavity 243 and fill and compact the remaining cavity of the third sealing cavity 243, thereby achieving good sealing at the connection between the second sealing portion 23 and the third connecting piece 40, and at the same time achieving the fixation of the third connecting piece 40, and the driving end 242 is sealed and connected to the second sealing portion 23.

[0039] like Figure 1 and Figure 3As shown, a sealing device for a temperature measuring device includes a first connecting member 10, a first sealing member 20, a second connecting member 30, a second sealing member 70 and a third connecting member 40; the third connecting member 40 is provided with a first through hole 41 along the axial direction, the third connecting member 40 includes a limiting end 42 and a second sealing end 43, the limiting end 42 is connected to the bottom of the placement cavity 14 to limit the third connecting member 40, the second sealing end 43 is successively passed through the second connecting member 30 and fixedly connected to the second sealing member 70, and the second sealing member 70 is fixedly connected in the first through hole 41 of the second sealing end 43.

[0040] like Figure 1 and Figure 3 As shown, a sealing device for temperature measurement equipment includes a first connector 10, a first seal 20, a second connector 30 and a third connector 40; the outer surface of the first sealing end 11 is provided with a thread, the inner wall of the second sealing cavity 31 is provided with a thread, the second connector 30 is connected to the first connector 10 through the thread, and the first connector 10 is rotated so that the first connector 10 gradually approaches the second connector 30 to squeeze the first seal 20 to seal the connection between the first sealing end 11 and the third connector 40. By rotating the third connector 40, the third connector 40 is close to the first connector 10 to squeeze the first seal, so as to achieve the sealing between the first seal 20 and the first sealing cavity 13, and the third connector 40, and then ensure the sealing between the first seal 10 and the second connector 30; through the threaded connection, it is convenient to adjust the pressure of the first seal 20 from the outside, so as to ensure that the pressure of the first seal 20 can be accurately adjusted according to the vacuum degree in the vacuum furnace during the debugging process, so as to ensure the best sealing effect and the best holding force, and extend the life of the first seal.

[0041] During assembly, the third connecting member 40 passes through the first connecting member 10 from the placement cavity 14 of the connecting end 12, and the third connecting member 40 is limited by the limiting end 42, and then the first sealing member 20 is inserted from the second sealing end 43, and the second sealing cavity 31 of the second connecting member 30 is threadedly connected with the first sealing end 11 of the first sealing member 10, and the second connecting member 30 is rotated to gradually approach the first connecting member 10, and then the second sealing portion 23 is pressed by the second pressing portion 24, so that the second sealing portion 23 is pressed into the first sealing cavity 13 to achieve the sealing of the connection between the first connecting member 10 and the second connecting member 30; finally, the second sealing member 70 is installed in the second sealing end 43, and the second sealing end 43 is pressed to make the third sealing end 43 mechanically deformed, so as to achieve the sealing of the second sealing member 70 and the second sealing end 43, that is, the sealing of the first through hole 41 of the third connecting member 40.

[0042] like Figure 5As shown, a sensor for a vacuum sintering furnace includes a sealing device for a temperature measuring device, a detection unit, a terminal 50, and a protective tube 60. The detection unit is arranged in the protective tube 60 and connected to the terminal 50 through the sealing device for the temperature measuring device. The protective tube 60 is fixedly connected to the first connecting member 10.

[0043] During installation, the protection tube 60 is extended into the furnace, and the connection end 12 is welded and sealed to the furnace, and connected to external components through the connection terminal 50 to achieve measurement of the temperature in the furnace.

[0044] The above are only specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any changes or replacements that are not conceived through creative work should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.

Claims

1. A sealing device for a temperature measuring device, characterized in that: include A first connecting member (10), the first connecting member (10) comprising a first sealing end (11) and a connecting end (12) connected to a measuring body, the first sealing end (11) being provided with a first sealing cavity (13), the connecting end (12) being provided with a placement cavity (14), the first sealing cavity (13) being in communication with the placement cavity (14); A first sealing member (20); a second connecting member (30), wherein a second sealed cavity (31) is provided at one end of the second connecting member (30), the first sealed end (11) extends into the second sealed cavity (31) and is connected to the second connecting member (30), and one end of the first sealing member (20) is sealedly connected to the first sealed cavity (13), and the other end is connected to the bottom of the second sealed cavity (31); A third connecting member (40), wherein the third connecting member (40) passes through the first connecting member (10), the first sealing member (20) and the second connecting member (30) in sequence and is fixedly connected to the second connecting member (30); by adjusting the second connecting member (30), the first sealing member (20) is sealedly connected to the first sealing cavity (13) and the third connecting member (40).

2. A sealing device for a temperature measuring device as claimed in claim 1, characterized in that: The first sealing member (20) comprises a first sealing portion (21) and a first pressing portion (22), and the first sealing member (20) is an integrated structure; one end of the first pressing portion (22) is fixedly connected to an end of the first sealing portion (21) having a larger cross-sectional diameter, and the other end of the first pressing portion (22) is connected to the second sealing cavity (31), and the first pressing portion (22) is sealedly connected to the first sealing cavity (13); the second connecting member (30) is adjusted, and when the first connecting member (10) gradually approaches the second connecting member (30), the first pressing portion (22) presses the first sealing portion (21), so that the first sealing member (20) is sealedly connected to the first sealing cavity (13) and the third connecting member (40).

3. A sealing device for a temperature measuring device as claimed in claim 2, characterized in that: The first sealing cavity (13) is a conical opening, and the first sealing portion (21) is a conical body matching the first sealing cavity (13).

4. A sealing device for a temperature measuring device as claimed in claim 1, characterized in that: The first sealing member (20) comprises a second sealing portion (23) and a second pressing portion (24); the second sealing portion (23) is a cylindrical body matching the first sealing cavity (13); the second sealing portion (23) is arranged in the first sealing cavity (13); and the second pressing portion (24) is arranged in the second sealing cavity (31); the second connecting member (30) is adjusted, and when the first connecting member (10) gradually approaches the second connecting member (30), the second pressing portion (24) presses the second sealing portion (23), so that the second sealing portion (23) is sealed and connected to the first sealing cavity (13) and the third connecting member (40).

5. A sealing device for a temperature measuring device as claimed in claim 4, characterized in that: The second pressing portion (24) comprises a supporting end (241) and a driving end (242); the supporting end (241) is connected to the bottom of the second sealing cavity (31); the driving end (242) is provided with a third sealing cavity (243); the third sealing cavity (243) is arranged along the axial direction and has a cross-sectional diameter that gradually decreases from the outside to the inside; the second pressing portion (24) is axially arranged to pass through a second through hole (25) of the third connecting member (40); the second through hole (25) is in communication with the third sealing cavity (243); and the driving end (242) is sealingly connected to the second sealing portion (23).

6. A sealing device for a temperature measuring device as claimed in claim 1, characterized in that: The third connecting member (40) further comprises a second sealing member (70). The third connecting member (40) is provided with a first through hole (41) along the axial direction. The third connecting member (40) comprises a limiting end (42) and a second sealing end (43). The limiting end (42) is connected to the bottom of the placement cavity (14) to limit the third connecting member (40). The second sealing end (43) passes through the second connecting member (30) and is fixedly connected to the second sealing member (70). The second sealing member (70) is fixedly connected to the first through hole (41) of the second sealing end (43).

7. A sealing device for a temperature measuring device as claimed in claim 1, characterized in that: The outer surface of the first sealing end (11) is provided with threads, the inner wall of the second sealing cavity (31) is provided with threads, and the second connecting piece (30) is connected to the first connecting piece (10) via threads.

8. A sensor for a vacuum sintering furnace, characterized in that: The invention comprises a sealing device for a temperature measuring device as claimed in any one of claims 1 to 7, a detection unit, a terminal (50), and a protective tube (60), wherein the detection unit is arranged in the protective tube (60) and connected to the terminal (50) via the sealing device for the temperature measuring device, and the protective tube (60) is fixedly connected to the first connecting member (10).

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