Sealing mechanism of thermocouple for vacuum heat treatment furnace

Abstract

The utility model discloses a sealing mechanism of a thermocouple for a vacuum heat treatment furnace, belongs to the technical field of thermocouple sealing, and is used for solving the problem of how to improve the convenience of disassembly and assembly of the thermocouple and the applicability to different thermocouples. The sealing mechanism comprises a sealing assembly and a sealing cap; the sealing assembly comprises a sealing sleeve, an upper extrusion part, an elastic part, a lower extrusion part and an extrusion ring; a mounting hole is formed in the sealing sleeve, and an annular supporting surface is arranged on the inner side of the mounting hole; the lower extrusion piece, the elastic piece, the upper extrusion piece and the extrusion ring are sequentially arranged in the mounting hole along the axial direction of the mounting hole, and the lower extrusion piece, the elastic piece and the upper extrusion piece are respectively provided with a sleeve hole for the thermocouple to pass through; the sealing cap is screwed on the sealing sleeve through threads, and is provided with a first communication hole through which the thermocouple passes; when the thermocouple passes through the sealing mechanism, the sealing cap is screwed tightly to extrude the extrusion ring, and the upper extrusion piece is forced to compress the elastic piece, so that the inner wall of the sleeve hole of the elastic piece elastically deforms and clamps the thermocouple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermocouple sealing, in particular to a sealing mechanism of a thermocouple for a vacuum heat treatment furnace. BACKGROUND

[0002] As the core temperature measuring element of temperature measuring instruments, thermocouples are widely used in various temperature measurement scenarios. The working principle of a thermocouple is to directly sense the temperature and convert the measured temperature into a thermoelectric electromotive force signal, which is then further processed by an electrical instrument to display the actual temperature of the measured medium. In temperature testing in a vacuum environment, the use of a thermocouple is particularly critical, and a sealing mechanism is needed to ensure its sealing in a vacuum state.

[0003] In the traditional approach, a thermocouple is often fixed inside a sealing mechanism through the extrusion action of an elastic member. However, the existing sealing mechanism design has the following shortcomings: on the one hand, the disassembly and replacement process is relatively cumbersome, which is not conducive to quick maintenance and replacement of the thermocouple; on the other hand, due to structural limitations, such sealing mechanisms are difficult to adapt to thermocouples of various models and sizes, limiting their application flexibility in a wider range of scenarios.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE INVENTION

[0005] (I) Technical problems solved

[0006] The sealing mechanism of a thermocouple for a vacuum heat treatment furnace provided by the embodiments of the present application can solve the problem of how to improve the convenience of disassembling and assembling a thermocouple and the applicability of different thermocouples.

[0007] (II) Technical solutions

[0008] To solve the above technical problems, the present application provides the following technical solutions:

[0009] A sealing mechanism of a thermocouple for a vacuum heat treatment furnace is provided, comprising a sealing assembly and a sealing cap;

[0010] The sealing assembly comprises a sealing sleeve, an upper extrusion member, an elastic member, a lower extrusion member and an extrusion ring;

[0011] The sealing sleeve is internally provided with a mounting hole, and the inner side of the mounting hole is provided with an annular support surface;

[0012] The lower extrusion member, the elastic member, the upper extrusion member and the extrusion ring are sequentially placed in the mounting hole along the axial direction of the mounting hole, and the lower extrusion member, the elastic member and the upper extrusion member are each provided with a sleeve hole for the thermocouple to pass through;

[0013] The sealing cap is screwed on the sealing sleeve and is provided with a first communication hole for the thermocouple to pass through; when the thermocouple is installed on the sintering furnace through the sealing mechanism, the sealing cap is screwed to extrude the extrusion ring, forcing the upper extrusion piece to compress the elastic piece, so that the inner wall of the sleeve hole of the elastic piece is elastically deformed and clamps the thermocouple.

[0014] In some embodiments, the inside of the mounting hole, the outside of the upper extrusion piece and the outside of the extrusion ring are provided with a key groove, and a rotation stopping key is installed in the key groove to prevent the upper extrusion piece and the extrusion ring from rotating circumferentially relative to the sealing sleeve.

[0015] In some embodiments, the elastic piece is made of a high-temperature-resistant elastic material, which is silica gel or fluororubber.

[0016] In some embodiments, the upper extrusion piece, the lower extrusion piece and the extrusion ring are made of a rigid material, which is stainless steel or copper alloy material.

[0017] In some embodiments, the sealing cap is a nut with threads on the inside, and the sealing sleeve is provided with matching threads on the outside.

[0018] In some embodiments, the bottom of the sealing sleeve is provided with a support seat, which is used for fixedly connecting the sealing mechanism and the sintering furnace.

[0019] In some embodiments, the support seat is a flange plate.

[0020] In some embodiments, the support seat is provided with a second communication hole in communication with the mounting hole.

[0021] In some embodiments, the rotation stopping key is a strip-shaped key installed in the key groove and extending axially along the mounting hole.

[0022] In some embodiments, the sleeve hole of the elastic piece has a wavy corrugated structure in axial section.

[0023] (Three) beneficial effects

[0024] Compared with the prior art, the technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0025] The sealing mechanism of the thermocouple for the vacuum heat treatment furnace has the advantages of convenient disassembly and assembly: during the installation process, the user only needs to sequentially place the lower extrusion piece, the elastic piece, the upper extrusion piece and the extrusion ring into the mounting hole, and then the assembly is completed by simply screwing the sealing cap. Similarly, the disassembly process only needs to perform the above steps in reverse, which significantly improves the maintenance and replacement efficiency of the thermocouple and ensures the rapid response to the maintenance requirements.

[0026] On the other hand, the sealing mechanism of the present application has high flexibility and wide applicability. Through the effective transmission of the extrusion ring, the sealing cap force is accurately distributed to the upper extrusion piece, which in turn cooperates with the lower extrusion piece to properly extrude the elastic piece, ensuring the stable fixation of the thermocouple. What is particularly important is that for different models and sizes of thermocouples, only the extrusion ring corresponding to the size of the thermocouple needs to be replaced, perfectly adapting to the fixation needs of various thermocouples, greatly enhancing the adaptability and flexibility of the sealing mechanism in diversified application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a front view of the sealing mechanism of the thermocouple for the vacuum heat treatment furnace in the embodiments of the present application;

[0029] Figure 2 is Figure 1 a sectional view of section A in

[0030] Figure 3 is a top view of the sealing mechanism structure of the thermocouple for the vacuum heat treatment furnace in the embodiments of the present application;

[0031] Figure 4 is Figure 3 a sectional view of section B in

[0032] Figure 5 is an exploded view of the sealing mechanism of the thermocouple for the vacuum heat treatment furnace in the embodiments of the present application.

[0033] Reference signs: sealing sleeve 1, lower extrusion piece 2, elastic piece 3, upper extrusion piece 4, extrusion ring 5, sealing cap 6, support seat 7, mounting hole 11, annular support surface 12, rotation stop key 14, sleeve hole 30, first communication hole 61, second communication hole 71.

[0034] Through the above drawings, the specific embodiments of the present application have been shown, and more detailed descriptions will be given in the following. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0036] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are some but not all of the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the utility model.

[0037] The existing thermocouple is usually fixed in the sealing mechanism by the elastic member extrusion mode, but the existing sealing mechanism is inconvenient to disassemble and replace, and is difficult to apply to different models and sizes of thermocouples.

[0038] To solve the above technical problems, the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figures 1 to 5 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 1 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 2 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 1 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 3 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 4 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 3 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to Figure 5 , the sealing mechanism of the thermocouple for the vacuum heat treatment furnace is provided. The vacuum heat treatment furnace takes the sintering furnace as an example. Referring to

[0039] The sealing mechanism of the thermocouple for the vacuum heat treatment furnace includes a sealing assembly, a sealing cap 6 and a support seat 7.

[0040] The sealing assembly includes a sealing sleeve 1, a lower extrusion piece 2, an elastic member 3, an upper extrusion piece 4 and an extrusion ring 5; the sealing sleeve 1 is internally provided with a mounting hole 11, one end of which is threadedly connected with the sealing cap 6, and the other end is integrally connected with the support seat 7; the inside bottom of the mounting hole 11 is provided with an annular support surface 12 facing the sealing cap 6; the lower extrusion piece 2, the elastic member 3, the upper extrusion piece 4 and the extrusion ring 5 are sequentially arranged in the axial direction of the mounting hole 11, and the lower extrusion piece 2, the elastic member 3 and the upper extrusion piece 4 are all provided with sleeve holes for the thermocouple to pass through; one end of the lower extrusion piece 2 abuts against the support surface 12, and the other end contacts the elastic member 3.

[0041] The sealing cap 6 is threadedly connected on the sealing sleeve 1, and is provided with a first communication hole 60 for the thermocouple to pass through; when the thermocouple passes through the sealing mechanism 1 and is installed on the sintering furnace, the sealing cap 6 is tightened to extrude the extrusion ring 5, so as to force the upper extrusion piece 4 to compress the elastic member 3, so that the elastic member 3 is elastically deformed to clamp the thermocouple.

[0042] In some embodiments, to prevent the upper extrusion member 4 and the extrusion ring 5 from rotating circumferentially relative to the sealing sleeve 1, see [reference needed]. Figure 2 As shown, keyways can be provided inside the mounting hole 11, outside the upper extruder 4, and outside the extrusion ring 5, and anti-rotation keys 14 can be inserted into the keyways. For example, the keyways and anti-rotation keys 14 extend axially along the mounting hole 11. The anti-rotation keys 14 can ensure that the extrusion ring 5 and the upper extruder 4 can only move axially, which can improve the fixing effect of the thermocouple and prevent the elastic element 3 from wearing due to rotational friction.

[0043] In some embodiments, considering the requirements for use in high-temperature environments, the elastic element 3 is preferably made of a high-temperature resistant elastic material, such as silicone or fluororubber, both of which can withstand high temperatures and maintain good elastic properties.

[0044] In some embodiments, stainless steel or copper alloy can be selected as the manufacturing material for the sealing sleeve 1, support base 7, upper extruder 4, lower extruder 2 and extrusion ring 5. These materials not only have good mechanical strength, but also resist high-temperature oxidation.

[0045] In some embodiments, the sealing sleeve 1, support base 7, upper extruder 4, lower extruder 2 and extrusion ring 5 are all cylindrical in shape, the mounting hole of the sealing sleeve is also cylindrical, and the outer diameter of the support base 7, upper extruder 4, lower extruder 2 and extrusion ring 5 is consistent with the inner diameter of the mounting hole.

[0046] In some implementations, see Figure 1 As shown, the sealing cap 6 can be a simple nut, and the outer wall of the sealing sleeve 1 has external threads. The thread design facilitates quick assembly and disassembly.

[0047] The bottom of the sealing sleeve 1 is connected to the support seat 7. The support seat is used to fix the sealing mechanism to the sintering furnace. The support seat 7 can be designed in the shape of a flange to facilitate connection with other equipment components. One end of the sealing sleeve 1 is welded to the flange or integrally formed to ensure axial load-bearing strength.

[0048] In some implementations, for ease of maintenance or monitoring, see [reference needed]. Figure 2 and Figure 4 As shown, the sealing cap 6 may have a first connecting hole 61, which communicates with the interior of the compression ring 5; simultaneously, the support base 7 also has a second connecting hole 71, which communicates with the mounting hole 11, thus facilitating inspection or adjustment. The diameters of the first and second connecting holes are 2cm to 5cm, and the inner walls of the holes are coated with a high-temperature resistant ceramic coating to reduce airflow resistance and prevent high-temperature corrosion. In the vacuum sintering furnace, the first and second connecting holes 61 and 71 can also balance the internal and external air pressures of the sealing mechanism, preventing deformation and failure of the elastic element 3 due to negative pressure.

[0049] In some embodiments, in order to improve the service life of the elastic member 3, the following improvements can also be made: the axial cross-section of the sleeve hole 30 of the elastic member 3 has a wavy corrugated structure, and the contact surface of the extrusion ring 5 and the upper extrusion member 4 is a tapered surface matching, and the angle of the tapered surface is 5° to 30°. For example, the corrugated depth of the wavy corrugated structure is 0.5mm to 1.5mm, and the corrugated pitch is 1mm to 3mm, which is used to uniformly distribute the deformation stress of the elastic member at high temperature. The corrugated elastic member increases the radial deformation amount of the elastic member 3 when compressed through the wavy structure, and improves the holding force on the thermocouple; at the same time, the corrugated gap allows the elastic member 3 to freely expand at high temperature, avoiding material cracking caused by local stress concentration. When the tapered surface of the extrusion ring 5 contacts the upper extrusion member 4, the axial locking force of the sealing cap 6 is uniformly converted into a radial component force, so that the elastic member 3 is more evenly stressed, avoiding unilateral wear. The corrugated structure and the tapered surface form a double optimization of elastic enhancement and pressure distribution. Experiments show that under the same locking torque, the clamping force is increased by 25% compared with the flat surface structure, and the insertion resistance of the thermocouple due to uniform contact stress distribution is reduced by 40%.

[0050] In some embodiments, in order to facilitate the installation of one or more thermocouples, the lower extrusion member 2, the elastic member 3, and the upper extrusion member 4 are respectively provided with one or more sleeve holes for the thermocouple to pass through. As shown in Figure 3 and 5 As shown, the lower extrusion member 2, the elastic member 3, and the upper extrusion member 4 are respectively provided with three sleeve holes that can simultaneously pass through the thermocouple.

[0051] The assembly steps of the sealing mechanism of the vacuum heat treatment furnace thermocouple are as follows: the lower extrusion member 2 is installed in the mounting hole 11, and the end face thereof abuts against the support surface 12; the elastic member 3, the upper extrusion member 4, and the extrusion ring 5 are sequentially placed, wherein when the thermocouple is installed on the sealing mechanism, it needs to sequentially pass through the sealing cap 6, the extrusion ring 5 in the sealing sleeve 1, the upper extrusion member 4, the elastic member 3, the lower extrusion member 2, and the support seat 7, and is preliminarily fixed by the pre-tightening force of the elastic member 3 and the sleeve hole 30; the sealing cap 6 is screwed on one end of the sealing sleeve 1 until the extrusion ring 5 is compressed; during the screwing process, the extrusion ring 5 pushes the upper extrusion member 4 to compress the elastic member 3, the sleeve hole 30 of the elastic member 3 shrinks radially so that its volume is compressed, and the elastic member clamps the thermocouple from the inside of the sleeve hole 30. When disassembling, only the above steps are operated in reverse, that is, the sealing cap 6 is rotated in reverse, the pressure on the extrusion ring 5 is released, the elastic member 3 rebounds, and the inner diameter of the sleeve hole 30 returns, so that the thermocouple can be taken out.

[0052] The sealing mechanism of the thermocouple for the vacuum heat treatment furnace has the advantages of convenient disassembly and assembly. When installing, only the lower extrusion piece 2, the elastic piece 3, the upper extrusion piece 4 and the extrusion ring 5 are sequentially installed in the installation hole 11, and then the sealing cap 6 is screwed and locked. When disassembling, reverse operation is performed. The disassembly and replacement process is more convenient, which is beneficial to quickly maintain and replace the thermocouple. On the other hand, the sealing mechanism of the above technical solution transmits the force of the sealing cap 6 to the upper extrusion piece 4 through the extrusion ring 5, and then extrudes the elastic piece 3 through the lower extrusion piece 2 and the upper extrusion piece 4 to fix the thermocouple. When different models and sizes of thermocouples need to be adapted, only the extrusion ring 5 corresponding to the size of the thermocouple needs to be replaced, and then the different deformation amounts of the elastic piece 3 are adapted to the fixing requirements of different thermocouples, which improves the applicability of different thermocouples and the application flexibility in a wider range of scenarios.

[0053] It should be noted that the sealing mechanism of the thermocouple for the vacuum heat treatment furnace can adjust the deformation amount of the elastic piece 3 by changing the length of the extrusion ring 5 on the basis of the tight thread cooperation between the sealing cap 6 and the sealing sleeve 1. Compared with the traditional way of adjusting the deformation amount of the elastic piece by adjusting the length of the thread cooperation, the length of the tight thread cooperation between the sealing cap 6 and the sealing sleeve 1 is not reduced, and different thermocouples can be adapted, and the comprehensive performance is improved.

[0054] The above is only an optional embodiment of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing mechanism of a thermocouple for a vacuum heat treatment furnace, characterized by, The sealing assembly and the sealing cap are included; The sealing assembly includes a sealing sleeve, an upper extruding piece, an elastic piece, a lower extruding piece and an extruding ring; The sealing sleeve is internally provided with a mounting hole, and the inner side of the mounting hole is provided with an annular supporting surface; The lower extruding piece, the elastic piece, the upper extruding piece and the extruding ring are sequentially placed in the mounting hole along the axial direction of the mounting hole, and the lower extruding piece, the elastic piece and the upper extruding piece are all provided with sleeve holes through which the thermocouple passes; The sealing cap is screwed on the sealing sleeve through threads, and is provided with a first communication hole through which the thermocouple passes; when the thermocouple passes through the sealing mechanism and is installed on the sintering furnace, the sealing cap is tightened to extrude the extruding ring, force the upper extruding piece to compress the elastic piece, and make the inner wall of the sleeve hole of the elastic piece elastically deform and clamp the thermocouple.

2. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 1, characterized by, The inner side of the mounting hole, the outer side of the upper extruding piece and the outer side of the extruding ring are provided with key grooves, and a rotation stopping key is installed in the key grooves to prevent the upper extruding piece and the extruding ring from rotating circumferentially relative to the sealing sleeve.

3. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 2, characterized by, The rotation stopping key is in the shape of a strip and extends axially along the mounting hole and is installed in the key groove.

4. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 1, characterized by, The elastic piece is made of a high-temperature-resistant elastic material, and the high-temperature-resistant elastic material is silicone or fluororubber.

5. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 1, characterized by, The upper extruding piece, the lower extruding piece and the extruding ring are made of a rigid material, and the rigid material is stainless steel or copper alloy material.

6. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 1, characterized by, The sealing cap is a nut with threads on the inner side, and the outer side of the sealing sleeve is provided with matching threads.

7. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 1, characterized by, A supporting seat is externally connected to the bottom of the sealing sleeve, and the supporting seat is used for fixedly connecting the sealing mechanism and the sintering furnace.

8. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 7, characterized by, The supporting seat is a flange plate.

9. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 7, characterized by, The supporting seat is provided with a second communication hole which is in communication with the mounting hole.

10. The sealing mechanism for a thermocouple of a vacuum heat treatment furnace according to claim 1, characterized by, The axial cross section of the sleeve hole of the elastic piece has a wavy corrugated structure.

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