Sealing structure for thermocouple of vacuum furnace

Abstract

The utility model relates to the technical field of vacuum furnace temperature measurement, in particular to a sealing structure for a thermocouple of a vacuum furnace, which comprises a thermocouple protection tube, a thermocouple connecting tube, a thermocouple seat, an insulating plate and a binding post, the thermocouple connecting tube is fixed on a furnace body of the vacuum furnace, and two ends of the thermocouple connecting tube are respectively arranged on the inner side and the outer side of the furnace body. The outer end of the thermocouple connecting pipe is fixedly connected with the thermocouple seat in an airtight mode, one end of the thermocouple protecting pipe is inserted into a furnace body from the thermocouple connecting pipe, the other end of the thermocouple protecting pipe is inserted into the thermocouple seat in an airtight mode through a first sealing structure, and a thermocouple wire at the end of the thermocouple protecting pipe is connected to a binding post. The other end of the thermocouple seat is fixedly connected with an insulating plate in an airtight mode, the binding post is fixedly installed on the insulating plate in an airtight mode through a second sealing structure, and the two ends of the binding post are arranged on the two sides of the insulating plate respectively. According to the sealing structure for the thermocouple of the vacuum furnace, two sealing structures are adopted, so that external atmosphere is prevented from entering the vacuum furnace due to breakage of the thermocouple protection tube.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum furnace temperature measurement, in particular to a sealing structure for a vacuum furnace thermocouple. Background Art

[0002] The vacuum furnace thermocouple is an important sensor specially used to measure temperature in vacuum environment. It uses the principle of thermoelectric effect to convert material temperature into electrical signal output, thereby realizing the monitoring and control of vacuum furnace temperature. The sealing structure of vacuum furnace thermocouple is the key part to ensure its normal operation and prevent gas leakage.

[0003] Existing vacuum furnace thermocouples all adopt a single-pass sealing structure, which relies on rotating and tightening the compression nut to compress the sealing ring to achieve a sealing effect. Since the thermocouple protective tube may break during use, air will leak at the break, destroying the vacuum in the furnace, affecting the use of the vacuum furnace, and causing damage to the workpiece being processed in the vacuum furnace. In view of the above problems, a sealing structure for a vacuum furnace thermocouple is provided. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a sealing structure for a thermocouple of a vacuum furnace. The sealing structure for a thermocouple of a vacuum furnace adopts two sealing structures to ensure that the external atmosphere does not enter the vacuum furnace due to the breakage of the thermocouple protective tube, thereby reducing the failure rate and maintenance cost of the vacuum furnace, thereby improving the production efficiency of the vacuum furnace.

[0005] The technical solution of the utility model is as follows:

[0006] A sealing structure for a thermocouple of a vacuum furnace comprises a thermocouple protective tube, a thermocouple pipe, a thermocouple seat, an insulating plate and a terminal. The thermocouple pipe is fixed on the furnace body of the vacuum furnace, and the two ends of the thermocouple pipe are respectively on the inner and outer sides of the furnace body, and the outer end of the thermocouple pipe is airtightly fixedly connected to the thermocouple seat. One end of the thermocouple protective tube is inserted into the furnace body from the thermocouple pipe, and the other end is airtightly inserted on the thermocouple seat through a first sealing structure. The thermocouple wire at the end of the thermocouple protective tube is connected to the terminal, and the other end of the thermocouple seat is airtightly fixedly connected with an insulating plate, and the terminal is airtightly fixedly installed on the insulating plate through a second sealing structure, and the two ends of the terminal are respectively on both sides of the insulating plate.

[0007] The first sealing structure includes an O-ring D, a pressure pad B and a screw plug. A through hole, a sealing installation hole and a threaded hole are sequentially arranged from the outside to the inside at the center of the thermocouple seat. The diameter of the sealing installation hole is larger than the diameter of the through hole. An O-ring D and a pressure pad B are sequentially installed in the sealing installation hole from the outside to the inside. The screw plug cooperates with the threaded hole to press the O-ring D and the pressure pad B.

[0008] The second sealing structure includes a pressure pad A and an O-ring C. A sealing ring installation groove is provided on the outer end face of the insulating plate. The O-ring C is installed in the sealing ring installation groove and sleeved on the terminal. The pressure pad A is pressed tightly on the outer end face of the O-ring C.

[0009] The pressure pad A is pressed against the O-ring C through a nut.

[0010] An O-type sealing ring A is installed between the outer end of the thermocouple pipe and the thermocouple seat.

[0011] An O-type sealing ring B is installed between the outer end surface of the thermocouple seat and the insulating plate.

[0012] A pressing ring is arranged at the outer end of the insulating plate, and the pressing ring, the insulating plate and the thermocouple seat are tightly connected so that the insulating plate is pressed tightly on the thermocouple seat.

[0013] An organic glass protective cover is fixedly arranged on the outer side of the pressure ring, and the organic glass protective cover covers the terminal.

[0014] A sealing method for a vacuum furnace thermocouple is provided, wherein the vacuum furnace thermocouple is sealed by providing a first sealing structure and a second sealing structure.

[0015] The thermocouple protective tube is airtightly installed by a first sealing structure, wherein the first sealing structure comprises an O-type sealing ring D, a pressure pad B and a screw plug, a through hole, a sealing installation hole and a threaded hole are sequentially arranged from the outside to the inside at the center of the thermocouple seat, the diameter of the sealing installation hole is larger than the diameter of the through hole, an O-type sealing ring D and a pressure pad B are sequentially installed in the sealing installation hole from the outside to the inside, and the screw plug cooperates with the threaded hole to press the O-type sealing ring D and the pressure pad B tightly;

[0016] The terminal is installed airtightly through a second sealing structure, which includes a pressure pad A and an O-ring C. A sealing ring installation groove is provided on the outer end face of the insulating plate. The O-ring C is installed in the sealing ring installation groove and is sleeved on the terminal, and the pressure pad A is pressed tightly on the outer end face of the O-ring C.

[0017] The beneficial effects of the utility model are:

[0018] The sealing structure for the thermocouple of the vacuum furnace ensures that the external atmosphere does not enter the vacuum furnace due to the breakage of the thermocouple protective tube by adopting two sealing structures, thereby reducing the failure rate and maintenance cost of the vacuum furnace and improving the production efficiency of the vacuum furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.

[0020] In the attached picture:

[0021] Figure 1 This is a schematic diagram of a sealing structure for a vacuum furnace thermocouple according to an embodiment of the utility model;

[0022] The components represented by the reference numerals in the figure are:

[0023] The utility model: 1. a thermocouple protective tube, 2. a thermocouple connecting pipe, 3. an O-type sealing ring A, 4. a thermocouple seat, 5. a screw, 6. an O-type sealing ring B, 7. an insulating plate, 8. a pressure ring, 9. a plexiglass protective cover, 10. a nut, 11. a pressure pad A, 12. an O-type sealing ring C, 13. a terminal, 14. an O-type sealing ring D, 15. a pressure pad B, 16. a screw plug. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, a sealing structure for a thermocouple of a vacuum furnace comprises a thermocouple protective tube 1, a thermocouple pipe 2, a thermocouple seat 4, an insulating plate 7 and a terminal 13. The thermocouple pipe 2 is fixed on the furnace body of the vacuum furnace, and the two ends of the thermocouple pipe 2 are respectively on the inner and outer sides of the furnace body, and the outer end of the thermocouple pipe 2 is airtightly fixedly connected to the thermocouple seat 4. One end of the thermocouple protective tube 1 is inserted into the furnace body from the thermocouple pipe 2, and the other end is airtightly inserted on the thermocouple seat 4 through a first sealing structure. The thermocouple wire at the end of the thermocouple protective tube 1 is connected to the terminal 13, and the insulating plate 7 is airtightly fixedly connected to the other end of the thermocouple seat 4. The terminal 13 is airtightly fixedly installed on the insulating plate 7 through a second sealing structure, and the two ends of the terminal 13 are respectively on both sides of the insulating plate 7.

[0025] The first sealing structure includes an O-ring D14, a pressure pad B15 and a screw plug 16. A through hole, a sealing installation hole and a threaded hole are sequentially arranged from the outside to the inside at the center of the thermocouple seat 4. The diameter of the sealing installation hole is larger than the diameter of the through hole. An O-ring D14 and a pressure pad B15 are sequentially installed in the sealing installation hole from the outside to the inside. The screw plug 16 cooperates with the threaded hole to press the O-ring D14 and the pressure pad B15.

[0026] The second sealing structure includes a pressure pad A11 and an O-ring C12. A sealing ring installation groove is provided on the outer end face of the insulating plate 7. The O-ring C12 is installed in the sealing ring installation groove and is sleeved on the terminal 13. The pressure pad A11 is pressed tightly on the outer end face of the O-ring C12. The pressure pad A11 is pressed tightly on the O-ring C12 through a nut 10.

[0027] An O-type sealing ring A3 is installed between the outer end of the thermocouple pipe 2 and the thermocouple seat 4.

[0028] An O-type sealing ring B6 is installed between the outer end surface of the thermocouple seat 4 and the insulating plate 7 .

[0029] A pressing ring 8 is provided at the outer end of the insulating plate 7 , and the pressing ring 8 , the insulating plate 7 and the thermocouple seat 4 are fastened together so that the insulating plate 7 is pressed against the thermocouple seat 4 .

[0030] An organic glass protective cover 9 is fixedly provided on the outer side of the pressing ring 8 , and the organic glass protective cover 9 covers the terminal 13 .

[0031] In a specific embodiment, the thermocouple pipe 2 is welded on the furnace body, the thermocouple seat 4 is connected to the thermocouple pipe 2 by bolts, with an O-ring 3A between them, the thermocouple seat 4 is lined with a thermocouple protective tube 1, the outer diameter of the thermocouple protective tube 1 is sleeved with an O-ring D14, a copper pressure pad B15 and a screw plug 16, and the copper pressure pad B15 and the O-ring D14 are pressed by the screw plug 16, and the above structure reaches the first sealing structure; the thermocouple wire at the end of the thermocouple protective tube 1 is connected to the copper terminal 13 and fixed with a screw 5, the outside of the thermocouple seat 4 is provided with an insulating plate 7, which is pressed by a pressure ring 8, and an O-ring B6 is provided between the thermocouple seat 4 and the insulating plate 7, and an O-ring 12C is also provided between the copper terminal 13 and the insulating plate 7, and the pressure pad A11 and the O-ring 12C are pressed by a copper nut 10 to form a second sealing structure, and a plexiglass protective cover 9 is fixed on the pressure ring 8 to protect the copper terminal 13.

[0032] The sealing method for the vacuum furnace thermocouple is used to seal the vacuum furnace thermocouple by setting a first sealing structure and a second sealing structure; the thermocouple protective tube 1 is airtightly installed by the first sealing structure, the first sealing structure includes an O-type sealing ring D14, a pressure pad B15 and a screw plug 16, and a through hole, a sealing installation hole and a threaded hole are sequentially arranged in the center of the thermocouple seat 4 from the outside to the inside, the diameter of the sealing installation hole is larger than the diameter of the through hole, and O-type sealing holes are sequentially installed in the sealing installation hole from the outside to the inside. Ring D14 and pressure pad B15, the screw plug 16 cooperates with the threaded hole to press the O-ring D14 and the pressure pad B15; the terminal 13 is airtightly installed through a second sealing structure, the second sealing structure includes a pressure pad A11 and an O-ring C12, a sealing ring installation groove is provided on the outer end face of the insulating plate 7, the O-ring C12 is installed in the sealing ring installation groove and is sleeved on the terminal 13, and the pressure pad A11 is pressed on the outer end face of the O-ring C12.

[0033] The sealing structure for the thermocouple of the vacuum furnace ensures that the external atmosphere does not enter the vacuum furnace due to the breakage of the thermocouple protective tube by adopting two sealing structures, thereby reducing the failure rate and maintenance cost of the vacuum furnace and improving the production efficiency of the vacuum furnace.

Claims

1. A sealing structure for a vacuum furnace thermocouple, It is characterized in that The invention comprises a thermocouple protective tube (1), a thermocouple pipe (2), a thermocouple seat (4), an insulating plate (7) and a terminal (13), wherein the thermocouple pipe (2) is fixed on a furnace body of a vacuum furnace, the two ends of the thermocouple pipe (2) are respectively located on the inner and outer sides of the furnace body, the outer end of the thermocouple pipe (2) is airtightly fixedly connected to the thermocouple seat (4), one end of the thermocouple protective tube (1) is inserted into the furnace body from the thermocouple pipe (2), and the other end is airtightly inserted into the thermocouple seat (4) through a first sealing structure, the thermocouple wire at the end of the thermocouple protective tube (1) is connected to the terminal (13), the insulating plate (7) is airtightly fixedly connected to the other end of the thermocouple seat (4), the terminal (13) is airtightly fixedly installed on the insulating plate (7) through a second sealing structure, and the two ends of the terminal (13) are respectively located on both sides of the insulating plate (7).

2. A sealing structure for a vacuum furnace thermocouple according to claim 1, It is characterized in that The first sealing structure comprises an O-type sealing ring D (14), a pressure pad B (15) and a screw plug (16). A through hole, a sealing installation hole and a threaded hole are sequentially arranged from the outside to the inside at the center of the thermocouple seat (4). The diameter of the sealing installation hole is larger than the diameter of the through hole. The O-type sealing ring D (14) and the pressure pad B (15) are sequentially installed in the sealing installation hole from the outside to the inside. The screw plug (16) cooperates with the threaded hole to press the O-type sealing ring D (14) and the pressure pad B (15).

3. A sealing structure for a vacuum furnace thermocouple according to claim 1, It is characterized in that The second sealing structure comprises a pressure pad A (11) and an O-type sealing ring C (12). A sealing ring installation groove is provided on the outer end surface of the insulating plate (7). The O-type sealing ring C (12) is installed in the sealing ring installation groove and sleeved on the terminal (13). The pressure pad A (11) is pressed tightly against the outer end surface of the O-type sealing ring C (12).

4. A sealing structure for a vacuum furnace thermocouple according to claim 3, It is characterized in that The pressure pad A (11) is pressed against the O-ring C (12) via the nut (10).

5. The sealing structure for a vacuum furnace thermocouple according to claim 1, It is characterized in that An O-type sealing ring A (3) is installed between the outer end of the thermocouple pipe (2) and the thermocouple seat (4).

6. A sealing structure for a vacuum furnace thermocouple according to claim 1, It is characterized in that An O-type sealing ring B (6) is installed between the outer end surface of the thermocouple seat (4) and the insulating plate (7).

7. The sealing structure for a vacuum furnace thermocouple according to claim 1, It is characterized in that A pressing ring (8) is provided at the outer end of the insulating plate (7), and the pressing ring (8), the insulating plate (7) and the thermocouple seat (4) are fastened together so that the insulating plate (7) is pressed tightly against the thermocouple seat (4).

8. A sealing structure for a vacuum furnace thermocouple according to claim 7, It is characterized in that A plexiglass protective cover (9) is fixedly arranged on the outer side of the pressure ring (8), and the plexiglass protective cover (9) covers the terminal (13).

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