Thermocouple plugging device for high-temperature vacuum furnace

Abstract

The utility model belongs to the technical field of vacuum furnace equipment, and particularly relates to a thermocouple plugging device for a high-temperature vacuum furnace. Comprising a heat preservation layer, a sealing box, a thermocouple assembly and a lifting driving mechanism, the sealing box is installed in a vacuum furnace connecting pipe on a vacuum furnace body, and the heat preservation layer is arranged at the inner side end of the sealing box; the thermocouple assembly penetrates through the sealing box and the heat preservation layer, the sealing assembly is arranged between the thermocouple assembly and the sealing box, and the lifting driving mechanism is arranged at the outer side end of the sealing box, connected with the thermocouple assembly and used for driving the thermocouple assembly to stretch out and draw back. The device is simple in structure and good in sealing performance, temperature measurement of the high-temperature sintering furnace in a low-temperature stage is realized, the thermocouple is removed from a high-temperature area in a high-temperature stage, and meanwhile, the vacuum degree of the vacuum furnace is not influenced in the whole plugging process.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum furnace equipment, in particular to a thermocouple plugging and unplugging device for a high-temperature vacuum furnace. Background Art

[0002] At present, high-temperature vacuum furnaces usually use infrared temperature measuring devices for temperature measurement. However, since the infrared temperature measuring device wants to achieve temperature control in the entire temperature range, it has high requirements for the infrared temperature measuring device, is expensive, and has a low cost-effectiveness ratio. Therefore, the current high-temperature vacuum furnace usually ignores the temperature of the low-temperature section and does not control it. Now, due to the development of the vacuum furnace equipment industry, the temperature control requirements for the low-temperature section of the high-temperature sintering furnace are getting higher and higher. Thermocouples are commonly used temperature measurement tools in low-temperature vacuum furnaces. They have the advantages of accurate temperature measurement and low price. However, since the temperature of the high-temperature section of the high-temperature vacuum furnace exceeds the temperature resistance limit of the thermocouple, thermocouples are used for temperature measurement in the low-temperature stage, and the thermocouples are evacuated from the high-temperature area in the high-temperature stage. Therefore, in response to this requirement, a high-temperature vacuum furnace thermocouple plug-in and pull-out device is urgently needed, and it must be ensured that the entire plug-in and pull-out process does not affect the vacuum degree of the vacuum furnace. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a thermocouple plugging and unplugging device for a high-temperature vacuum furnace to solve the problem that the temperature of the low-temperature section of the current high-temperature sintering furnace is difficult to control.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a high-temperature vacuum furnace thermocouple plugging and unplugging device, comprising a thermal insulation layer, a sealing box, a thermocouple assembly and a lifting drive mechanism, wherein the sealing box is installed in a vacuum furnace pipe on a vacuum furnace body, and an inner side end of the sealing box is provided with a thermal insulation layer; the thermocouple assembly penetrates the sealing box and the thermal insulation layer, and a sealing assembly is provided between the thermocouple assembly and the sealing box, the lifting drive mechanism is arranged at the outer side end of the sealing box, and the lifting drive mechanism is connected to the thermocouple assembly, and the lifting drive mechanism is used to drive the thermocouple assembly to extend and retract.

[0006] The thermocouple assembly comprises an armored thermocouple and a protective tube. The protective tube is sleeved on the outside of the armored thermocouple, and the upper end of the protective tube is locked and fixed with the armored thermocouple through a locking assembly.

[0007] The locking assembly includes a baffle, a locking nut and a sealing ring, wherein the baffle and the sealing ring are sleeved on the armored thermocouple and are sequentially accommodated in countersunk holes provided on the upper end surface of the protective tube from the inside to the outside, and the locking nut is sleeved on the armored thermocouple and is connected to the outer thread provided on the outer circumference of the upper end of the protective tube.

[0008] The sealing assembly comprises a limiting ring, a spacer ring, a spring, a pressure pad sealing ring module and an elastic retaining ring for a hole which are sequentially arranged along the axial direction, wherein the limiting ring and the spacer ring are axially limited by two inner stoppers in the sealing box.

[0009] The sealing ring module comprises two groups of V-shaped rubber rings arranged back to back, a pressure ring is arranged between the two groups of V-shaped rubber rings, and V-shaped grooves matching the two groups of V-shaped rubber rings are symmetrically arranged on both sides of the pressure ring.

[0010] The limiting ring is made of polytetrafluoroethylene; the spacer ring, pressure pad and pressure ring are all made of aluminum alloy.

[0011] The outer end surface of the sealing box is provided with a box body connecting flange, and the box body connecting flange is connected to the pipe connecting flange provided at the end of the vacuum furnace pipe connecting end by bolts.

[0012] The lifting drive mechanism comprises a cylinder and a clamping plate, wherein the output end of the cylinder is connected to the outer end surface of the sealing box, and the cylinder body of the cylinder is connected to the thermocouple assembly through the clamping plate.

[0013] The outer end surface of the sealing box is provided with a nut for connecting with the output end of the cylinder.

[0014] The material of the thermal insulation layer is carbon felt, the thermal insulation layer is fixedly connected to the inner end of the sealing box by bolts, and the thermal insulation layer is provided with a central hole for the thermocouple assembly to pass through.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. The utility model provides a high-temperature vacuum furnace thermocouple plugging and unplugging device with a simple structure and good sealing performance. It can measure the temperature of a high-temperature sintering furnace in the low-temperature stage and remove the thermocouple from the high-temperature area in the high-temperature stage, while ensuring that the entire plugging and unplugging process does not affect the vacuum degree of the vacuum furnace.

[0017] 2. The sealing box of the utility model adopts double-sided sealing inside, which has better airtightness and will not affect the sealing effect of the vacuum furnace due to the dynamic sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a thermocouple plugging and unplugging device for a high-temperature vacuum furnace according to the utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0020] In the figure: 1 is an insulation layer, 2 is a sealing box, 3 is a splint, 4 is a baffle, 5 is a locking nut, 6 is an armored thermocouple, 7 is a cylinder, 8 is a nut, 9 is a protective tube, 21 is a limit ring, 22 is a spacer ring, 23 is a spring, 24 is a pressure pad, 25 is a pressure ring, 26 is a V-shaped rubber ring, 27 is an elastic retaining ring for a hole, 28 is a connecting flange, 29 is a vacuum furnace connecting pipe, and 31 is a vacuum furnace body. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-2 As shown, the utility model provides a high-temperature vacuum furnace thermocouple plugging and unplugging device, comprising an insulation layer 1, a sealing box 2, a thermocouple assembly and a lifting drive mechanism, wherein the sealing box 2 is installed in a vacuum furnace pipe 29 on a vacuum furnace body 31, and an insulation layer 1 is provided at the inner end of the sealing box 2; the thermocouple assembly passes through the sealing box 2 and the insulation layer 1, and a sealing assembly is provided between the thermocouple assembly and the sealing box 2, the lifting drive mechanism is arranged at the outer end of the sealing box 2, and the lifting drive mechanism is connected to the thermocouple assembly, and the lifting drive mechanism is used to drive the thermocouple assembly to extend and retract, thereby realizing that the thermocouple assembly is evacuated from the high-temperature area in the high-temperature stage, thereby improving the service life of the thermocouple assembly.

[0023] like Figure 1 As shown, in the embodiment of the utility model, the thermocouple assembly includes an armored thermocouple 6 and a protective tube 9, the protective tube 9 is sleeved on the outside of the armored thermocouple 6, and the upper end of the protective tube 9 is locked and fixed to the armored thermocouple 6 through a locking assembly.

[0024] Specifically, the locking assembly includes a baffle 4, a locking nut 5 and a sealing ring, wherein the baffle 4 and the sealing ring are sleeved on the armored thermocouple 6, and are sequentially accommodated in the countersunk holes provided on the upper end surface of the protective tube 9 from the inside to the outside. The locking nut 5 is sleeved on the armored thermocouple 6 and is connected to the outer circumference of the upper end of the protective tube 9 with an external thread, which facilitates disassembly and maintenance while achieving a good sealing effect.

[0025] In the embodiment of the utility model, the lifting drive mechanism includes a cylinder 7 and a clamping plate 3, wherein the output end of the cylinder 7 is connected to the outer end surface of the sealing box 2, and the cylinder body of the cylinder 7 is connected to the protective tube 9 of the thermocouple assembly through the clamping plate 3.

[0026] Specifically, the clamping plate 3 is a two-section split structure, one side of which is fixed to the cylinder body of the cylinder 7 by bolts, and the other side is clamped and fixed by the two-section clamping plate. The protective tube 9 is a hollow optical axis with a smooth outer surface. The armored thermocouple 6 passes through the protective tube 9, and the protective tube 9 and the armored thermocouple 6 are sealed and fixed together by the rubber ring, the baffle 4 and the locking nut 5, so that the protective tube 9, the armored thermocouple 6 and the cylinder body can achieve synchronous action, and the expansion and contraction of the armored thermocouple 6 is achieved by controlling the cylinder. In this way, when the cylinder 7 executes the extension and contraction commands, the protective tube 9 and the armored thermocouple 6 are driven to achieve the purpose of insertion and extraction.

[0027] In the embodiment of the utility model, the sealing box 2 is a hollow cylindrical structure, and the outer end face of the sealing box 2 is provided with a box body connecting flange, which is connected to the pipe flange 28 provided at the end of the vacuum furnace pipe 29 by bolts and is sealed by a rubber ring.

[0028] Furthermore, a nut 8 is welded on the box connecting flange at the outer end of the sealing box 2, and the output end of the cylinder 7 is threadedly connected and fixed to the nut 8.

[0029] Specifically, the material of the insulation layer 1 is carbon felt, and the insulation layer 1 is fixedly connected to the inner end of the sealing box 2 by bolts, and the insulation layer 1 is provided with a central hole for the thermocouple assembly to pass through. Further, the insulation layer 1 is composed of multiple layers of circular carbon felt pads, and is fixed to the sealing box 2 by stud bolts made of stainless steel.

[0030] like Figure 2 As shown, in the embodiment of the utility model, the sealing assembly is sleeved on the outer side of the protective tube 9 and is accommodated in the central hole of the sealing box 2. Specifically, the sealing assembly includes a limiting ring 21, a spacer ring 22, a spring 23, a pressure pad 24, a sealing ring module and a hole elastic retaining ring 27 which are sequentially arranged along the axial direction, wherein the limiting ring 21 and the spacer ring 22 are axially limited by two stepped inner stoppers in the sealing box 2.

[0031] In the embodiment of the utility model, the sealing ring module includes two groups of V-shaped rubber rings 26 arranged back to back, a pressure ring 25 is provided between the two groups of V-shaped rubber rings 26, and V-shaped grooves matching the two groups of V-shaped rubber rings 26 are symmetrically provided on both sides of the pressure ring 25.

[0032] Specifically, the limiting ring 21 is made of polytetrafluoroethylene and is placed at the lower end of the center hole of the sealing box 2 to play a guiding role. The spacer ring 22, the pressure pad 24, and the pressure ring 25 are all made of aluminum alloy, which can well protect the smoothness of the sealing surface under the dynamic sealing structure, avoid damage to the sealing surface of the protective tube during the action process, and affect the sealing effect. The spacer ring 22 is placed on the limiting ring 21 to fix the limiting ring 21. The spring 23, the pressure pad 24, a group of V-shaped rubber rings 26, the pressure ring 25, another group of V-shaped rubber rings 26, and the hole elastic retaining ring 27 are placed on the spacer ring 22 in sequence. The hole spring retaining ring 27 is set at the outermost side of the sealing groove for axial limitation of the entire sealing assembly. The upper and lower groups of V-shaped rubber rings 26 and the pressure ring 25 are symmetrically placed, and multiple V-shaped rubber rings are placed on both ends, so that the vacuum degree of the vacuum furnace can be well guaranteed regardless of the insertion or extraction action.

[0033] During operation, compressed air is introduced into the cylinder 7 by switching the control valve, and the pressure energy of the compressed air is converted into mechanical energy to drive the cylinder to make linear and reciprocating motions, thereby realizing the insertion and extraction motions of the armored thermocouple 6. The protective tube 9 passes through all the internal components of the sealing box 2, and forms a complete dynamic sealing structure with the sealing box 2. At the same time, the sealing form of multiple groups of V-shaped rubber rings 26 can fully ensure the sealing effect regardless of the insertion or extraction motion.

[0034] The utility model provides a high-temperature vacuum furnace thermocouple plugging and unplugging device, which has a simple structure and good sealing performance, and can realize the temperature measurement of the high-temperature sintering furnace in the low-temperature stage, and remove the thermocouple from the high-temperature area in the high-temperature stage, while ensuring that the entire plugging and unplugging process does not affect the vacuum degree of the vacuum furnace. The inside of the sealing box adopts double-sided sealing, which has better airtightness and will not affect the sealing effect of the vacuum furnace due to the dynamic sealing structure.

[0035] The above description is only an implementation method of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A thermocouple plugging and unplugging device for a high temperature vacuum furnace, characterized in that: The invention comprises a heat-insulating layer (1), a sealing box (2), a thermocouple assembly and a lifting drive mechanism, wherein the sealing box (2) is installed in a vacuum furnace pipe (29) on a vacuum furnace body (31), and the inner side end of the sealing box (2) is provided with a heat-insulating layer (1); the thermocouple assembly penetrates the sealing box (2) and the heat-insulating layer (1), and a sealing assembly is provided between the thermocouple assembly and the sealing box (2); the lifting drive mechanism is arranged at the outer side end of the sealing box (2), and the lifting drive mechanism is connected to the thermocouple assembly, and the lifting drive mechanism is used to drive the thermocouple assembly to extend and retract.

2. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 1, characterized in that: The thermocouple assembly comprises an armored thermocouple (6) and a protective tube (9), wherein the protective tube (9) is sleeved on the outside of the armored thermocouple (6), and the upper end of the protective tube (9) is locked and fixed to the armored thermocouple (6) via a locking assembly.

3. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 2, characterized in that: The locking assembly comprises a baffle (4), a locking nut (5) and a sealing ring, wherein the baffle (4) and the sealing ring are sleeved on the armored thermocouple (6) and are sequentially accommodated in countersunk holes provided on the upper end surface of the protective tube (9) from the inside to the outside, and the locking nut (5) is sleeved on the armored thermocouple (6) and is connected to the outer circumference of the upper end of the protective tube (9) by an external thread.

4. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 1, characterized in that: The sealing assembly comprises a limiting ring (21), a spacer ring (22), a spring (23), a pressure pad (24), a sealing ring module and a hole elastic retaining ring (27) which are arranged in sequence along the axial direction, wherein the limiting ring (21) and the spacer ring (22) are axially limited by two internal stoppers in the sealing box (2).

5. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 4, characterized in that: The sealing ring module comprises two groups of V-shaped rubber rings (26) arranged back to back, a pressure ring (25) is arranged between the two groups of V-shaped rubber rings (26), and V-shaped grooves matching the two groups of V-shaped rubber rings (26) are symmetrically arranged on both sides of the pressure ring (25).

6. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 5, characterized in that: The limiting ring (21) is made of polytetrafluoroethylene; the spacer ring (22), the pressure pad (24) and the pressure ring (25) are all made of aluminum alloy.

7. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 1, characterized in that: The outer end surface of the sealing box (2) is provided with a box body connecting flange, and the box body connecting flange is connected to a pipe flange (28) provided at the end of the vacuum furnace pipe (29) by bolts.

8. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 1, characterized in that: The lifting drive mechanism comprises a cylinder (7) and a clamping plate (3), wherein the output end of the cylinder (7) is connected to the outer end surface of the sealing box (2), and the cylinder body of the cylinder (7) is connected to the thermocouple assembly through the clamping plate (3).

9. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 8, characterized in that: The outer end surface of the sealing box (2) is provided with a nut (8) for connecting to the output end of the cylinder (7).

10. The high temperature vacuum furnace thermocouple plugging and unplugging device according to claim 1, characterized in that: The material of the thermal insulation layer (1) is carbon felt. The thermal insulation layer (1) is fixedly connected to the inner end of the sealing box (2) by means of bolts. The thermal insulation layer (1) is provided with a central hole for the thermocouple assembly to pass through.

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