Furnace door of vacuum gas quenching furnace
By adopting a double-layer structure design, thermal insulation layer and reinforcement rib structure in the vacuum air quench furnace door, combined with the locking tooth locking ring, the problem of the furnace door being easily deformed and poor sealing under high pressure and high temperature environment is solved, and higher thermal stability and sealing are achieved, reducing maintenance costs.
Patent Information
- Application Number
- CN202421976933.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-15
AI Technical Summary
The existing vacuum air quench furnace doors are prone to deformity under high pressure and high temperature environments, have poor sealing and are prone to damage, resulting in gas leakage and heat loss, and increase maintenance costs.
The double-layer structural design is adopted, including the thermal insulation layer between the first and second steel plates, which enhances the combination of rib structure and locking tooth locking ring, and improves the stiffness, sealing and thermal stability of the furnace door.
It significantly improves the thermal stability and thermal insulation performance of the furnace door, enhances sealing, reduces gas leakage and heat loss, extends the service life of the furnace door, and reduces maintenance costs.
Smart Images
Figure CN222961479U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to heat treatment equipment, in particular to a furnace door of a vacuum quenching furnace. Background Art
[0002] In the field of metal heat treatment, vacuum quenching furnaces are widely used in the manufacturing process of various precision parts because they can perform rapid cooling in an oxygen-free or low-oxygen environment, thereby significantly improving the hardness and strength of metal materials and reducing defects such as oxidation and decarburization. With the increasing requirements for vacuum heat treatment in the manufacturing industry, the quenching pressure requirement of vacuum quenching furnaces has also increased to the level of 20 bar, and the size requirement of vacuum quenching furnaces has reached 1500 mm. During the operation of such large-size and high-pressure vacuum quenching furnaces, the furnace door, as an important component for isolating the inside of the furnace from the external environment, its performance directly affects the heat treatment effect and the stability of the furnace internal environment.
[0003] 1. Traditional furnace doors of vacuum quenching furnaces usually adopt a single-layer metal structure and are connected to the furnace body through simple hinge or sliding mechanisms. Although this design has a simple structure and low cost, it has the following defects under high-temperature and repetitive thermal cycle working conditions:
[0004] 2. Insufficient sealing performance: With the increasing requirements for quenching pressure in the industry, especially when the quenching pressure rises to 20 bar, the metal furnace door is prone to deformation at high temperatures, resulting in a decrease in the sealing performance between the furnace door and the furnace body, which may cause gas leakage inside the furnace and affect the heat treatment effect.
[0005] 3. Large heat loss: Due to the lack of effective heat insulation measures, the furnace door will dissipate a large amount of heat to the external environment at high temperatures, not only reducing the thermal efficiency but also increasing energy consumption.
[0006] 4. Poor durability: Working in a high-temperature environment for a long time makes the furnace door material prone to fatigue and damage, requiring frequent maintenance and replacement, which increases the operating cost.
[0007] 5. High maintenance cost: Since the furnace door is frequently in contact with high temperatures and corrosive gases, its surface is easily oxidized and corroded, and regular maintenance and coating of protective layers are required, which increases the maintenance cost.
[0008] In response to the above problems, although there have been some improvement measures, such as using high-temperature resistant alloy materials and adding simple heat insulation filling layers, these improvements are often limited to the performance improvement of a single aspect and fail to comprehensively solve the challenges faced by the furnace door in actual use in a high-pressure and high-temperature environment. Summary of the Invention
[0009] In view of the above-mentioned defects of the prior art, the technical problems to be solved by the present utility model are that the furnace door of the existing vacuum gas quenching furnace is prone to deformation, poor sealing performance and easy damage under high-pressure and high-temperature environments. The present utility model provides a vacuum gas quenching furnace door with a double-layer structure design, which reduces the deformation amount of the furnace door in the working state and reduces gas leakage; an adiabatic layer is provided to improve the thermal stability of the furnace door; in cooperation with the locking teeth and the locking ring, the furnace door will be tightly pressed on the furnace body during use, improving its sealing performance.
[0010] To achieve the above object, the present utility model provides a vacuum gas quenching furnace door, including a furnace door body and locking teeth, and the locking teeth are arranged on the periphery of the furnace door body; the furnace door body includes a first layer of steel plate and a second layer of steel plate, the first layer of steel plate and the second layer of steel plate are welded together, and an adiabatic layer is arranged between the first layer of steel plate and the second layer of steel plate, and the adiabatic layer uses circulating cooling water for heat insulation; wherein, the first layer of steel plate faces the inside of the vacuum gas quenching furnace, the second layer of steel plate faces the outside of the furnace, a water inlet hole is arranged at the upper end of the second layer of steel plate, a water outlet hole is arranged at the lower end of the second layer of steel plate, and the water inlet hole and the water outlet hole are connected to the circulating cooling water device.
[0011] Furthermore, radial rib plates and annular rib plates are also arranged between the first layer of steel plate and the second layer of steel plate, and the radial rib plates connect the annular rib plates and the connection part of the first layer of steel plate and the second layer of steel plate; the radial rib plates are arranged evenly.
[0012] Furthermore, reinforcing ribs are also arranged on the surface of the first layer of steel plate facing the furnace interior.
[0013] Furthermore, the reinforcing ribs are arranged in a cross shape.
[0014] Furthermore, the thickness of the first layer of steel plate is set to be 10 - 30 mm.
[0015] Furthermore, the thickness of the second layer of steel plate is set to be 10 - 30 mm.
[0016] Furthermore, the thickness of the adiabatic layer is 50 - 100 mm.
[0017] Furthermore, the number of teeth of the locking teeth is 15 - 30.
[0018] Furthermore, the width of the locking teeth is 150 - 250 mm.
[0019] Furthermore, it also includes a high-temperature oxidation-resistant coating, which is coated on the outer surfaces of the first layer of steel plate and the second layer of steel plate.
[0020] Technical effects
[0021] A vacuum gas quenching furnace door of the present utility model uses a double-layer structure and a heat insulation layer to significantly improve the thermal stability and heat insulation performance of the furnace door; the radial rib plates and annular rib plates in the double-layer structure, and the reinforcing rib structure enhance the stiffness and strength of the furnace door, enhance the sealing performance of the furnace door, and ensure the stability of the vacuum degree and temperature inside the furnace; the toothed locking form around the furnace door body and the circumferential drive mechanism improve the opening and closing efficiency of the furnace door, with uniform force and the furnace door not being easily deformed; the use of a high-temperature anti-oxidation coating extends the service life of the furnace door and reduces the maintenance cost.
[0022] The concept, specific structure and technical effects of the present utility model will be further described below in conjunction with the accompanying drawings to fully understand the purpose, features and effects of the present utility model. Brief Description of the Drawings
[0023] Figure 1 is a schematic diagram of a vacuum gas quenching furnace door of a preferred embodiment of the present utility model;
[0024] Figure 2 is a cross-sectional schematic diagram of a vacuum gas quenching furnace door of a preferred embodiment of the present utility model;
[0025] Figure 3 is a mating schematic diagram of a vacuum gas quenching furnace door of a preferred embodiment of the present utility model. Detailed Description of the Preferred Embodiment
[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0027] In the following description, specific details such as specific internal procedures and technologies are proposed for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.
[0028] As Figures 1 - 3As shown in the figure, a vacuum gas quenching furnace door includes a furnace door body 100 and locking teeth 112. The locking teeth 112 are arranged on the periphery of the furnace door body 100. The furnace door body 100 includes a first layer of steel plate and a second layer of steel plate, which are welded together. An insulating layer 200 is arranged between the first layer of steel plate and the second layer of steel plate, and the insulating layer 200 uses circulating cooling water for heat insulation. Among them, the first layer of steel plate faces the inside of the vacuum gas quenching furnace, the second layer of steel plate faces the outside of the furnace, a water inlet hole 110 is arranged at the upper end of the second layer of steel plate, a water outlet hole 111 is arranged at the lower end of the second layer of steel plate, and the water inlet hole 110 and the water outlet hole 111 are connected to the device of the circulating cooling water.
[0029] A radial rib plate 113 and an annular rib plate 114 are also arranged between the first layer of steel plate and the second layer of steel plate. The radial rib plate 113 connects the annular rib plate 114 and the connection part of the first layer of steel plate and the second layer of steel plate. The radial rib plates 113 are arranged evenly. The thickness of the first layer of steel plate is set to be 10 - 30 mm. The thickness of the second layer of steel plate is set to be 10 - 30 mm. The thickness of the insulating layer is 50 - 100 mm. The thickness of the radial rib plate and the annular rib plate is 10 - 20 mm, and the diameter of the annular rib plate is 500 - 1000 mm. During use, the radial rib plate 113 and the annular rib plate 114 are immersed in the circulating cooling water of the insulating layer 200. Flow channels 201 with a pore diameter of 10 - 30 mm are arranged on both the radial rib plate 113 and the annular rib plate 114 and are used as circulating cooling water channels.
[0030] A reinforcing rib 115 is also arranged on the surface of the first layer of steel plate facing the furnace interior. The reinforcing ribs are arranged in a cross shape, and the thickness of the reinforcing ribs is 10 - 20 mm.
[0031] In addition, the number of the locking teeth is 15 - 30. The width of the locking teeth is 150 - 250 mm. The locking teeth on the furnace door body cooperate with the locking ring 300 on the furnace body. The number of the locking rings is the same as the number of the locking teeth, and the sizes match. When the furnace door is closed and opened, an external driving device drives the locking ring 300 to rotate to achieve rapid opening and closing. The external driving device can be a motor gear mechanism or a cylinder connecting rod mechanism.
[0032] Another preferred embodiment of the present utility model further includes a high - temperature oxidation - resistant coating 116, which is coated on the outer surfaces of the first layer of steel plate and the second layer of steel plate. This coating is formed by a spraying process, is tightly connected to the surface of the furnace door, and has good high - temperature resistance, corrosion resistance, and wear resistance.
[0033] The following will illustrate the use state of a vacuum gas quenching furnace door of the present utility model in a vacuum gas quenching furnace.
[0034] During operation, the furnace door is driven by the rotating mechanism to fit with the furnace body of the vacuum gas quenching furnace, and then the locking ring starts to rotate under the action of the driving device, so that the locking ring is aligned with the locking teeth of the furnace door, and the furnace door is also tightly closed on the furnace body of the vacuum gas quenching furnace, and the furnace door is closed; the furnace door circulating cooling water pump switch is turned on, and the cooling water in the furnace door circulates; the heat treatment function of the vacuum gas quenching furnace is turned on, and the vacuum gas quenching furnace performs the set heat treatment processes such as vacuuming, heating, heat preservation, pressurized inflation, and rapid cooling; during the heat treatment process, the furnace door will experience high temperature, vacuum, high pressure and other working conditions, all of which maintain stable performance and shape; after the heat treatment is completed, the temperature in the vacuum gas quenching furnace returns to room temperature, the air pressure returns to normal atmospheric pressure, and the furnace door is closed to circulate cooling water; the locking ring starts to rotate under the action of the driving device, so that the locking ring and the locking teeth of the furnace door are completely staggered, and the furnace door is driven away from the vacuum gas quenching furnace by the rotating mechanism, and the furnace door is opened.
[0035] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.
Claims
1. A vacuum gas quenching furnace door, characterized in that: It includes a furnace door body and locking teeth, and the locking teeth are arranged on the periphery of the furnace door body; the furnace door body includes a first layer of steel plate and a second layer of steel plate, the first layer of steel plate and the second layer of steel plate are welded, and an insulating layer is arranged between the first layer of steel plate and the second layer of steel plate, and the insulating layer uses circulating cooling water for heat insulation; wherein, the first layer of steel plate faces the inside of the vacuum air quenching furnace, and the second layer of steel plate faces the outside of the furnace, the upper end of the second layer of steel plate is provided with a water inlet hole, and the lower end of the second layer of steel plate is provided with a water outlet hole, and the water inlet hole and the water outlet hole are connected to a circulating cooling water device.
2. A vacuum gas quenching furnace door as claimed in claim 1, characterized in that: A radial rib plate and an annular rib plate are further provided between the first steel plate and the second steel plate. The radial rib plate connects the annular rib plate and the connection between the first steel plate and the second steel plate. The radial rib plates are arranged to be evenly distributed.
3. A vacuum gas quenching furnace door as claimed in claim 1, characterized in that: The first steel plate is also provided with reinforcing ribs on one side facing the furnace.
4. A vacuum gas quenching furnace door as claimed in claim 3, characterized in that: The reinforcing ribs are arranged in a cross shape.
5. The vacuum gas quenching furnace door according to claim 1, characterized in that: The thickness of the first layer of steel plate is set to 10-30 mm.
6. A vacuum gas quenching furnace door as claimed in claim 1, characterized in that: The thickness of the second steel plate is set to 10-30 mm.
7. The vacuum gas quenching furnace door according to claim 1, characterized in that: The thickness of the thermal insulation layer is 50-100 mm.
8. The vacuum gas quenching furnace door according to claim 1, characterized in that: The number of teeth of the locking teeth is 15-30.
9. The vacuum gas quenching furnace door according to claim 1, characterized in that: The width of the locking teeth is 150-250 mm.
10. The vacuum gas quenching furnace door according to claim 1, characterized in that: It also includes a high temperature anti-oxidation coating, which is coated on the outer surfaces of the first steel plate and the second steel plate.