A vacuum heat treatment furnace load test sealing device

Abstract

The utility model relates to the field of heat treatment processing, concretely relates to a vacuum heat treatment furnace load test sealing device, including front -positioned sealing flange and rear -positioned sealing flange, front -positioned sealing flange one side end surface is connected with vacuum furnace body, and sets up O type rubber ring between front -positioned sealing flange and furnace body, and sets up intermediate sealing pad between front -positioned sealing flange and rear -positioned sealing flange, rear -positioned sealing flange is fixedly connected with furnace body, and the wire hole that the front -positioned sealing flange and rear -positioned sealing flange all are provided with position corresponding is provided with for odd silk to pass through, the utility model discloses a sealing connection problem of equipment and thermocouple in the production field load test process is solved, and the load test device convenient for staff dismounting solves the problem of high load test cost and work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment processing, specifically to a sealing device used in the vacuum heat treatment load test process. Background Technology

[0002] Vacuum heat-treated products require a load test during initial processing. By measuring the difference between the actual temperature-reaching time of the part and the temperature-reaching time controlled by the thermocouple in the equipment, the actual holding time for this type of product can be determined, ensuring product quality. Vacuum furnaces operate under vacuum conditions at high temperatures. Consumable thermocouples consist of two metal wires of different materials welded together at one end. The welded end (the temperature-sensing end) must be close to the product, while the other end (the cold junction) extends outside the furnace to connect to a recording instrument. The cold junction typically consists of two 0.5mm metal wires. Ensuring the sealing of consumable thermocouples during load testing in a vacuum furnace is an industry-wide challenge.

[0003] Consumable thermocouples offer advantages such as the ability to be cut to any length, multiple uses from a single purchase, high convenience, and high sensitivity (due to the absence of armor and alumina powder insulation, and a diameter of 0.5mm), resulting in more accurate test data. However, they present a challenge in sealing when used in a vacuum furnace. Two 0.5mm or thinner metal wires must be threaded through the furnace body without any crossing or connection, as any contact between the wires will cause temperature distortion. Therefore, the flange used must be insulated; simultaneously, the flange must withstand a certain pressure and possess sufficient toughness to ensure the test process can withstand 10... -4 It can withstand a negative pressure of 100,000 Pa and a positive pressure of 100,000 Pa (positive pressure is required for the processing of air-quenched products).

[0004] Currently, vacuum furnaces typically use armored thermocouples for load testing, which has disadvantages such as high procurement costs, fixed length, long procurement cycle, need to be scrapped upon expiration, large diameter (generally 3mm) and low sensitivity. Utility Model Content

[0005] The purpose of this utility model is to provide a safe, well-sealed, and convenient heat treatment vacuum furnace load test sealing device to solve the problem of sealing connection between equipment and thermocouples during the load test process on the production site. At the same time, it is a load test device that is easy for employees to disassemble and assemble, thus solving the problems of high load test cost and work efficiency.

[0006] Technical solution: A sealing device for a load test of a vacuum heat treatment furnace includes a front sealing flange 2 and a rear sealing flange 4. One end face of the front sealing flange 2 is connected to the furnace body 6 of the vacuum furnace, and an O-ring is provided between the front sealing flange 2 and the furnace body 6. An intermediate sealing gasket is provided between the front sealing flange 2 and the rear sealing flange 4. The rear sealing flange 4 is fixedly connected to the furnace body. Both the front sealing flange 2 and the rear sealing flange 4 are provided with wire holes corresponding to the positions for the coupling wire to pass through.

[0007] Furthermore, a groove is provided on the end face of the front sealing flange 2 near the furnace body 6, and an O-ring is installed in the groove.

[0008] Furthermore, a cylindrical groove is provided on the end face of the front sealing flange 2 away from the furnace body 6 for installing an intermediate sealing gasket, the height of which is higher than the cylindrical groove.

[0009] Furthermore, the front sealing flange 2 is provided with two rings of threaded holes arranged around the circumference, the diameter of the threaded holes is 1mm, and there is a distance between adjacent threaded holes.

[0010] Furthermore, the rear sealing flange 4 is provided with two rings of threaded holes arranged around the circumference, with a diameter of 1mm and a distance between adjacent threaded holes.

[0011] Furthermore, the threaded holes on the front sealing flange 2 correspond one-to-one with the threaded holes on the rear sealing flange 4.

[0012] Furthermore, the front sealing flange 2 and the rear sealing flange 4 are fixedly connected to the furnace body by bolts.

[0013] Technical effects of this utility model: This invention employs a combination of two bakelite front and rear sealing flanges, which serve both insulating and temperature measurement functions. This prevents short circuits caused by the two thermocouple wires contacting the flanges, thus avoiding temperature distortion. The separate wire holes effectively prevent the wires from crossing and short-circuiting as they pass through the flanges. Simultaneously, the intermediate sealing gasket ensures a seal between the thermocouple wires and the furnace body, maintaining good sealing performance under both positive and negative pressure. This solves the problem of using consumable thermocouples in vacuum furnaces.

[0014] The device proposed in this utility model has a simple and compact structure, low processing and manufacturing cost, convenient operation for testing, high accuracy of test results, and good versatility and applicability of flange sealing. The size can be adjusted according to the equipment interface size and the number of thermocouples to accommodate more vacuum furnaces. It reduces testing costs, improves the accuracy of test results, and shortens the thermocouple procurement cycle and frequency, saving time and costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the sealing device for load testing of the vacuum heat treatment furnace of this utility model; Figure 2 This is a schematic diagram of the "O"-shaped rubber ring structure of this utility model; Figure 3 This is a schematic diagram of the front sealing flange of this utility model; Figure 4 This is a schematic diagram of the overall structure of the intermediate sealing gasket of this utility model; Figure 5 This is a schematic diagram of the structure of the rear-mounted sealing flange of this utility model; Figure 6 This is a structural schematic diagram of the fastening bolt of this utility model; Wherein: 1—"O" ring rubber ring, 2—front sealing flange, 3—intermediate sealing gasket, 4—rear sealing flange, 5—fastening bolt, 6—furnace body connection, 7—consumable thermocouple, 8—"O" ring rubber ring groove, 9—threaded hole, 10—bolt fixing hole, 12—cylindrical groove, 13—fastening nut. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings: like Figure 1 As shown, the sealing device of this utility model includes a front sealing flange 2 and a rear sealing flange 4. One end face of the front sealing flange 2 is connected to the furnace body 6 of the vacuum furnace, and an O-ring is provided between the front sealing flange 2 and the furnace body 6. An intermediate sealing gasket is provided between the front sealing flange 2 and the rear sealing flange 4. The rear sealing flange 4 is fixedly connected to the furnace body. Both the front sealing flange 2 and the rear sealing flange 4 are provided with wire holes corresponding to the positions for the coupling wire to pass through.

[0019] The front sealing flange 2 has a slot on the end face near the furnace body 6, and an O-ring is installed in the slot.

[0020] The front sealing flange 2 has a cylindrical groove on the end face away from the furnace body 6 for installing an intermediate sealing gasket, and the height of the intermediate sealing gasket is higher than the cylindrical groove.

[0021] The front sealing flange 2 is provided with two rings of threaded holes arranged around the circumference. The diameter of the threaded holes is 1mm, and there is a distance between adjacent threaded holes.

[0022] The rear sealing flange 4 is provided with two rings of threaded holes arranged around the circumference. The diameter of the threaded holes is 1mm, and there is a distance between adjacent threaded holes.

[0023] The threaded holes on the front sealing flange 2 correspond one-to-one with the threaded holes on the rear sealing flange 4.

[0024] The front sealing flange 2 and the rear sealing flange 4 are fixedly connected to the furnace body by bolts.

[0025] When installing the load test sealing device, follow the sequence from left to right as shown in the diagram. First, insert the 1 "O" ring into the groove of the 2 front sealing flange and connect it to the furnace body 6. Then, pass the thermocouple wires 7 one by one through the 1mm wire hole of the 2 front sealing flange, pierce the 3 intermediate sealing gasket, and then pass them through the 1mm wire hole of the 4 rear sealing flange. Finally, use the 5 fastening bolts to connect the entire assembled sealing device to the vacuum furnace. The hot end of the thermocouple should be inserted into the furnace and close to the product, while the cold end should be connected to the external recorder.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A sealing device for load testing of a vacuum heat treatment furnace, characterized in that, It includes a front sealing flange and a rear sealing flange. One end face of the front sealing flange is connected to the vacuum furnace body, and an O-ring is installed between the front sealing flange and the furnace body. An intermediate sealing gasket is installed between the front sealing flange and the rear sealing flange. The rear sealing flange is fixedly connected to the furnace body. Both the front sealing flange and the rear sealing flange are provided with wire holes corresponding to the position for the coupling wire to pass through.

2. The vacuum heat treatment furnace load test sealing device according to claim 1, characterized in that, A groove is provided on the end face of the front sealing flange near the furnace body, and an O-ring is installed in the groove.

3. The vacuum heat treatment furnace load test sealing device according to claim 2, characterized in that, A cylindrical groove is provided on the end face of the front sealing flange away from the furnace body for installing an intermediate sealing gasket. The height of the intermediate sealing gasket is higher than the cylindrical groove.

4. The vacuum heat treatment furnace load test sealing device according to claim 1, characterized in that, The front sealing flange is provided with two rings of threaded holes arranged around the circumference. The diameter of the threaded holes is 1mm, and there is a distance between adjacent threaded holes.

5. The vacuum heat treatment furnace load test sealing device according to claim 4, characterized in that, The rear sealing flange is provided with two rings of threaded holes arranged around the circumference. The diameter of the threaded holes is 1mm, and there is a distance between adjacent threaded holes.

6. The vacuum heat treatment furnace load test sealing device according to claim 5, characterized in that, The threaded holes on the front sealing flange correspond one-to-one with the threaded holes on the rear sealing flange.

7. The vacuum heat treatment furnace load test sealing device according to claim 1, characterized in that, The front sealing flange and the rear sealing flange are fixedly connected to the furnace body by bolts.

Images