Thermocouple sealing device for vacuum eutectic furnace

Abstract

The utility model relates to a thermocouple sealing device for a vacuum eutectic furnace, which comprises a connecting main body and a thermocouple pressing mechanism, the connecting main body is provided with a through hole, and a mounting step is arranged in the through hole along the circumferential direction; the thermocouple pressing mechanism comprises a pressing block, a sealing block and a bottom plate which are sequentially connected from top to bottom, and a pressing nut pressed on the pressing block, the bottom plate is arranged on the mounting step, the sealing block is constructed to be capable of being compressed, the top end of the pressing block protrudes out of the upper end face of the connecting body, the pressing nut is connected to the connecting body, and the sealing block is arranged on the sealing block. And the pressing block, the sealing block and the bottom plate are respectively provided with thermocouple mounting holes which correspond to one another. According to the thermocouple sealing device provided by the utility model, the connecting main body and the detachable thermocouple pressing mechanism arranged in the connecting main body are arranged, so that the whole device can be conveniently connected with the shell of the vacuum eutectic furnace, and meanwhile, the device is convenient to disassemble and assemble; and by limiting the structure of the thermocouple pressing mechanism, the sealing effect can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum eutectic furnaces, in particular to a thermocouple sealing device used in vacuum eutectic furnaces. Background Art

[0002] The vacuum eutectic furnace is a process welding furnace for high-end products. It can ensure that the welding materials work in a vacuum environment, a nitrogen environment or a formic acid environment. At the same time, it can evenly heat up and cool down the materials and the tube shell to avoid cavitation and excessive oxidation. It has a good effect on improving the accuracy of the welding points and ensuring the accuracy of product performance. During the welding process, a thermocouple is required to detect the temperature in the cavity in real time. The existing thermocouple fixing and sealing method usually seals the thermocouple on the shell of the vacuum eutectic furnace through two opposite sealing sleeves. The sealing sleeve is pressed and fixed with a fixed pressure plate. Due to the alternating hot and cold of the cavity, it is very easy to cause the sealing sleeve to age and deform, and the sealing cannot be guaranteed. Utility Model Content

[0003] The purpose of the utility model is to provide a thermocouple sealing device for a vacuum eutectic furnace, which can solve the technical problems mentioned in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thermocouple sealing device for a vacuum eutectic furnace, comprising a connecting body and a thermocouple clamping mechanism, the connecting body is provided with a through hole, and an installation step is provided in the through hole along the circumferential direction; the thermocouple clamping mechanism comprises a pressing block, a sealing block and a base plate connected in sequence up and down, and a clamping nut pressed on the pressing block, the base plate is seated on the installation step, the sealing block is constructed to be able to be compressed, the top end of the pressing block protrudes from the upper end surface of the connecting body, the clamping nut is connected to the connecting body, and the pressing block, the sealing block and the base plate are respectively provided with thermocouple mounting holes corresponding to each other.

[0005] As a preferred solution, the connecting body includes a connecting end for connecting to the shell and an assembly end for installing a thermocouple clamping mechanism, and the connecting end and the assembly end are integrally formed to ensure overall stability and sealing.

[0006] As a preferred solution, the connection end is constructed as a threaded column structure that matches the mounting hole of the housing, and a circular gasket is sleeved on the periphery of the connection end.

[0007] As a preferred solution, the connecting end is constructed as a connecting flange structure, and the connecting end is provided with an annular groove for installing a sealing ring on a side facing the housing.

[0008] As a preferred solution, the outer surface of the assembly end is provided with a thread that cooperates with the clamping nut.

[0009] As a preferred solution, the thermocouple mounting holes are arranged in multiple groups, and the specific quantity is set according to actual needs.

[0010] As a preferred solution, the upper and lower ends of the sealing block are respectively provided with sloped recessed portions, and the top end of the base plate and the bottom end of the pressure block are respectively provided with snap-fitting positions matched with the recessed portions. The cooperation between the recessed portions and the snap-fitting positions can further improve the sealing performance of the cooperation between the sealing block, the pressure block and the base plate.

[0011] As a preferred solution, a stop key is fixedly provided on the side end of the pressure block, and a stop groove cooperating with the stop key is provided on the inner wall of the connecting body. The cooperation between the stop key and the stop groove can prevent the pressure block from rotating, thereby avoiding twisting off the thermocouple.

[0012] As a preferred solution, the pressing block and the bottom plate are both made of metal, and the sealing block is made of polytetrafluoroethylene.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the thermocouple sealing device for a vacuum eutectic furnace provided by the utility model, by providing a connecting body and a detachable thermocouple clamping mechanism installed in the connecting body, makes it easy for the entire device to be connected to the vacuum eutectic furnace shell and easy to disassemble and assemble; and by limiting the structure and material of the thermocouple clamping mechanism, the sealing effect can be ensured; the cooperation of the stop key and the stop groove can prevent the pressing block from rotating, thereby preventing the thermocouple from being twisted off. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a thermocouple sealing device provided in one embodiment of the utility model;

[0015] Figure 2 for Figure 1 Section view in AA direction;

[0016] Figure 3 for Figure 1 Exploded diagram of

[0017] Figure 4 This is a schematic structural diagram of another embodiment of the utility model;

[0018] Figure 5 for Figure 4 Bottom view of .

[0019] The meaning of each number in the figure is:

[0020] 1. Connecting body; 11. Connecting end; 111. Threaded column; 112. Circular gasket; 113. Connecting flange; 114. Annular groove; 12. Assembly end; 121. Stop groove; 2. Installation step; 3. Thermocouple clamping mechanism; 31. Pressing block; 311. Stop key; 32. Sealing block; 321. Recessed portion; 33. Bottom plate; 331. Positioning; 34. Pressing nut; 341. Avoidance hole; 4. Thermocouple installation hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, 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.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation on the present invention.

[0023] See also Figure 1-Figure 2 This embodiment discloses a thermocouple sealing device for a vacuum eutectic furnace, which is connected to the shell of the vacuum eutectic furnace. The thermocouple extends into the interior of the shell and is used to detect the temperature in the cavity.

[0024] The thermocouple sealing device includes a connection body 1 and a thermocouple pressing mechanism 3 installed in the connection body 1. The connection body 1 includes a connection end 11 and an assembly end 12. The connection end 11 is used to connect to the shell, and the assembly end 12 is used to install the thermocouple pressing mechanism 3. In this embodiment, the connection body 1 is an integrally formed structure to ensure overall stability and sealing. A through hole is provided in the center of the connection body 1, and the thermocouple pressing mechanism 3 is arranged in the through hole. The thermocouple is installed in the thermocouple pressing mechanism 3 and extends into the interior of the shell through the through hole.

[0025] See also Figure 1 In this embodiment, the connection end 11 is constructed as a threaded column 111 structure matching the housing mounting hole. The connection end 11 is screwed into the housing mounting hole, and the connection is sealed by a circular gasket 112 sleeved on the connection end 11. Figure 4 , Figure 5 In other embodiments, the connection end 11 may also be constructed as a connection flange 113 structure, which is provided with an annular groove 114 for installing a sealing ring on the side facing the shell. The connection end 11 cooperates with the shell by adopting the connection flange 113 structure, which can improve the application range of the connection end 11 and make the communication between the cavity and the outside world more flexible.

[0026] See also Figure 2 , an installation step 2 for installing the thermocouple clamping mechanism 3 is provided in the through hole along the annular direction. Specifically, the thermocouple clamping mechanism 3 includes a pressure block 31, a sealing block 32 and a bottom plate 33 which are sequentially connected up and down, and a clamping nut 34 which is pressed on the pressure block 31. The pressure block 31, the sealing block 32 and the bottom plate 33 have the same outer diameter, and their outer walls abut against the inner wall of the connecting body 1. The bottom plate 33 at the bottom end is seated on the installation step 2, the sealing block 32 is placed on the bottom plate 33, the pressure block 31 is placed on the sealing block 32, and the top end of the pressure block 31 protrudes from the upper end surface of the connecting body 1 to cooperate with the clamping nut 34. See Figure 2 The outer surface of the assembly end 12 of the connecting body 1 is provided with a thread that cooperates with the clamping nut 34, and the clamping nut 34 is configured to clamp the pressure block 31 by screwing.

[0027] The pressing block 31, the sealing block 32 and the bottom plate 33 are respectively provided with corresponding thermocouple mounting holes 4, which are used to install thermocouples, and the number of the thermocouple mounting holes 4 is set to at least one group, and can also be set to multiple groups according to actual application conditions. Correspondingly, the clamping nut 34 is provided with an avoidance hole 341 for avoiding the thermocouple mounting hole 4. The thermocouple sealing device provided in this embodiment has simple coordination between the various structures, and is also convenient for disassembly and assembly or replacement of the sealing blocks 32 corresponding to different numbers of thermocouple mounting holes 4 according to use requirements.

[0028] In this embodiment, the sealing block 32 is constructed to be compressible and is preferably made of high-temperature resistant polytetrafluoroethylene. The pressure block 31 and the bottom plate 33 must both have sufficient hardness and are preferably made of metal. When the tightening nut 34 applies pressure to the pressure block 31, the pressure block 31 and the bottom pressure plate with sufficient hardness can cause extrusion deformation to the middle sealing block 32, thereby ensuring the overall sealing of the device.

[0029] Combination Figure 3 Furthermore, in the present embodiment, the upper and lower ends of the sealing block 32 located in the middle are respectively recessed inward to form a sloped recessed portion 321. Correspondingly, the top end of the bottom plate 33 and the bottom end of the pressing block 31 are respectively provided with a clamping position 331 matched with the recessed portion 321. The cooperation between the recessed portion 321 and the clamping position 331 can further improve the sealing performance of the cooperation between the sealing block 32, the pressing block 31 and the bottom plate 33.

[0030] In actual application, when the clamping nut 34 abuts against the pressing block 31, the pressing block 31 may be driven to rotate during further tightening and screwing, which may easily cause the thermocouple to be twisted off. Therefore, in this embodiment, a stop key 311 is fixedly provided at the side end of the pressing block 31, and correspondingly, a stop groove 121 cooperating with the stop key 311 is provided on the inner wall of the assembly end 12 of the connecting body 1, so that the pressing block 31 can be prevented from rotating by the cooperation of the stop key 311 and the stop groove 121.

[0031] The thermocouple sealing device for a vacuum eutectic furnace provided by the utility model has a simple overall structure, convenient operation, easy disassembly and assembly, and the sealing effect can be guaranteed. According to actual tests, the sealing effect has a wide range, which can achieve positive pressure of 3 bar and negative pressure of 3.0x10 -8 mbar, and the temperature is 80℃ for normal operation.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A thermocouple sealing device for a vacuum eutectic furnace, characterized in that: include: A connecting body (1), the connecting body (1) being provided with a through hole, and a mounting step (2) being provided in the through hole along a circumferential direction; The thermocouple clamping mechanism (3) comprises a clamping block (31), a sealing block (32) and a base plate (33) connected in sequence from top to bottom, and a clamping nut (34) pressed on the clamping block (31); the base plate (33) is seated on the mounting step (2); the sealing block (32) is configured to be compressible; the top end of the clamping block (31) protrudes from the upper end surface of the connecting body (1); the clamping nut (34) is connected to the connecting body (1); and the clamping block (31), the sealing block (32) and the base plate (33) are respectively provided with corresponding thermocouple mounting holes (4).

2. The thermocouple sealing device according to claim 1, characterized in that: The connecting body (1) comprises a connecting end (11) for connecting to a shell and an assembling end (12) for installing a thermocouple pressing mechanism (3); the connecting end (11) and the assembling end (12) are integrally formed.

3. The thermocouple sealing device according to claim 2, characterized in that: The connection end (11) is constructed as a threaded column (111) structure matching the housing mounting hole, and a circular gasket (112) is sleeved on the periphery of the connection end (11).

4. The thermocouple sealing device according to claim 2, characterized in that: The connecting end (11) is constructed as a connecting flange (113) structure, and the connecting end (11) is provided with an annular groove (114) for installing a sealing ring on a side facing the housing.

5. The thermocouple sealing device according to claim 2, characterized in that: The outer surface of the assembly end (12) is provided with a thread that matches the compression nut (34).

6. The thermocouple sealing device according to claim 1, characterized in that: The thermocouple mounting holes (4) are arranged in multiple groups.

7. The thermocouple sealing device according to claim 1, characterized in that: The upper and lower ends of the sealing block (32) are respectively provided with sloped recessed portions (321), and the top end of the bottom plate (33) and the bottom end of the pressing block (31) are respectively provided with latching positions (331) matched with the recessed portions (321).

8. The thermocouple sealing device according to claim 1, characterized in that: A stop key (311) is fixedly provided at the side end of the pressing block (31), and a stop groove (121) cooperating with the stop key (311) is provided on the inner wall of the connecting body (1).

9. The thermocouple sealing device according to claim 1, characterized in that: The pressing block (31) and the bottom plate (33) are both made of metal, and the sealing block (32) is made of polytetrafluoroethylene.

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