Self-closed air inlet device and sintering furnace
Through the self-closed air intake device, the opening and closing of the intake valve core is controlled by airflow impact and gravity. Combined with the semispherical design, the problem of the reduction in the sealing property of the sintering furnace air intake device at high temperatures is solved, and good sealing and safety are achieved.
Patent Information
- Application Number
- CN202422599593.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The air intake device of the existing sintering furnace is prone to deform at high temperatures, resulting in a decrease in airtightness and affecting temperature control and safety.
It adopts a self-closed air intake device, including an intake valve seat, an intake valve core and counterweight block, and uses airflow impact to open and gravity to close, combined with a semi-spoke valve bonnet design to ensure that the sealing is not affected by temperature.
Maintain good sealing in high-temperature environments to prevent process gas leakage, avoid fire running and temperature failure, and improve the safety and process control of the sintering furnace.
Smart Images
Figure CN223137068U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sintering furnaces, in particular to a self-closing air inlet device and a sintering furnace. Background Art
[0002] When a sintering furnace is working, it generally needs to be carried out in an atmosphere of process gases such as inert gas or reducing gas, and it is inevitable to set air inlets. After the air inlet is completed, the air inlet needs to be closed to avoid fire running and problems such as unqualified temperature. In the common air inlet device, gas is directly introduced into the sintering cavity. After the air inlet is closed, the high temperature in the furnace will cause the seal to deform, thereby affecting the airtightness of the air inlet device and resulting in fire running in the sintering furnace and unqualified temperature in the sintering furnace. Summary of the Utility Model
[0003] In view of this, it is necessary to provide a self-closing air inlet device with a simple structure and the airtightness not affected by temperature.
[0004] It is also necessary to provide a sintering furnace equipped with a self-closing air inlet device.
[0005] A self-closing air inlet device includes an air inlet valve seat, an air inlet valve core, and a counterweight. The air inlet valve seat and the air inlet valve core are sleeved and connected. The diameter of the air inlet valve core is smaller than the inner diameter of the air inlet valve seat. A hemispherical valve cap is provided at the upper end of the air inlet valve core, and the radius of the valve cap is greater than the inner diameter of the air inlet valve seat, so that the air inlet valve core is placed on the air inlet valve seat. The lower end of the air inlet valve core extends out of the air inlet valve seat, and the bottom of the air inlet valve core is detachably connected to the counterweight. A plurality of air inlet holes are provided at the lower end of the air inlet valve seat, and process gas enters the air inlet valve seat through the air inlet holes.
[0006] Preferably, an external thread is provided at the lower end of the air inlet valve core. Correspondingly, an internal threaded hole is provided at the center of the counterweight, and the air inlet valve core and the counterweight are threadedly connected.
[0007] Preferably, a strip-shaped groove is provided on the upper surface of the valve cap to facilitate tightening of the air inlet valve core and the counterweight.
[0008] Preferably, a conical groove is provided at the upper end of the air inlet valve seat to maintain the airtightness between the air inlet valve seat and the air inlet valve core.
[0009] A sintering furnace equipped with a self-closing air inlet device includes a furnace shell, a graphite cavity, and a self-closing air inlet device. The furnace shell is provided with an air inlet. The graphite cavity is arranged in the furnace shell, and the self-closing air inlet device is arranged at the bottom of the graphite cavity and penetrates through the side wall of the graphite cavity.
[0010] Beneficial effects: When process gas needs to be supplied into the graphite cavity, first fill the process gas between the furnace shell and the graphite cavity. The process gas then enters the intake valve seat. When the pressure difference between the inside and outside of the graphite cavity is large enough, the process gas will push open the intake valve core. The process gas enters the graphite valve core. The intake valve core is relatively thick, so it is not easy to deform. Even if deformation occurs, the hemispherical structure can deform uniformly, thus still maintaining good sealing performance. When process gas does not need to be supplied, the gas supply at the intake port of the furnace shell stops, the pressure inside the furnace decreases, and the intake valve core closes the outlet of the intake valve under the action of gravity, achieving a sealing effect. The pressure in the gap between the furnace shell and the graphite cavity is always greater than the pressure in the graphite cavity, so as to effectively prevent the overflow of lipid volatiles and the like during the sintering process. Brief Description of the Drawings
[0011] Figure 1 It is a schematic structural view of the self-closing intake device of the present utility model.
[0012] Figure 2 It is a schematic structural view of the sintering furnace equipped with the self-closing intake device of the present utility model.
[0013] In the figure: self-closing intake device 10, intake valve seat 20, intake hole 201, conical groove 202, intake valve core 30, valve cap 301, strip groove 3011, counterweight 40, furnace shell 50, graphite cavity 60. Detailed Embodiment
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0015] Please refer to Figure 1 , a self-closing intake device 10 includes an intake valve seat 20, an intake valve core 30, and a counterweight 40. The intake valve seat 20 and the intake valve core 30 are sleeved and connected. The diameter of the intake valve core 30 is smaller than the inner diameter of the intake valve seat 20. A hemispherical valve cap 301 is provided at the upper end of the intake valve core 30. The radius of the valve cap 301 is greater than the inner diameter of the intake valve seat 20, so that the intake valve core 30 is placed on the intake valve seat 20. The lower end of the intake valve core 30 extends out of the intake valve seat 20. The bottom of the intake valve core 30 is detachably connected to the counterweight 40. A plurality of intake holes 201 are provided at the lower end of the intake valve seat 20, and process gas enters the intake valve seat 20 through the intake holes 201.
[0016] The intake valve seat 20 of the present utility model is used to cooperate with the intake valve core 30 and can maintain good sealing performance after the intake is completed. At the same time, the intake valve seat 20 is also used for the diversion of process gas. The process gas enters the intake valve seat 20 along the intake port of the intake valve seat 20 and finally enters the sintering cavity. The intake valve seat 20 can be connected to the intake pipeline or can be connected to the furnace shell 50 with a gap.
[0017] The intake valve core 30 of the present utility model is used to control the process gas to enter the sintering cavity and, at the same time, maintain the sealing performance of the sintering cavity when the process gas does not enter. The opening of the valve core is opened by the impact of air flow or air pressure; the closing of the valve core is closed by its own gravity.
[0018] It can be understood that both the intake valve seat 20 and the intake valve core 30 are made of high-temperature resistant materials, such as alloys, graphite, etc. If the material itself has a relatively large density, the material valve core can be made hollow to reduce the weight of the intake valve core 30. A hemispherical valve cap 301 is provided at the upper end of the intake valve core 30, and the valve cap 301 controls the entry of the process gas. The hemispherical design helps to evenly distribute the force, reduces the damage to the material when colliding with the intake valve seat 20, and improves the sealing performance. At the same time, when deformation occurs, the deformation in all directions is relatively uniform, and it can still maintain good sealing with the intake valve seat 20.
[0019] There are various detachable connection methods between the intake valve core 30 and the counterweight 40, such as snap connection, spot welding, pin connection, etc.
[0020] In a preferred embodiment, an external thread is provided at the lower end of the intake valve core 30. Correspondingly, an internal threaded hole is provided at the center of the counterweight 40, and the intake valve core 30 and the counterweight 40 are threadedly connected.
[0021] In a preferred embodiment, in order to facilitate the rotation of the intake valve core 30, a strip-shaped groove 3011 is provided on the upper surface of the valve cap 301 to facilitate tightening the intake valve core 30 and the counterweight 40. Since the valve cap 301 is round and relatively slippery, by providing the strip-shaped groove 3011, tools such as a screwdriver can be used to tighten the intake valve core 30 and the counterweight 40.
[0022] In a preferred embodiment, a conical groove 202 is provided at the upper end of the intake valve seat 20 to maintain the sealing performance between the intake valve seat 20 and the intake valve core 30. If the upper end of the intake valve seat 20 is flat, then the intake valve core 30 and the intake valve seat 20 are likely to knock out a notch on the end face during the bumping process, thereby affecting the sealing performance. By providing the conical groove 202 at the upper end of the intake valve seat 20, the intake valve seat 20 is touched by a surface, which can effectively reduce the damage caused by the collision.
[0023] Furthermore, the present invention also proposes a sintering furnace equipped with a self-closing intake device 10.
[0024] Specifically, please refer to Figure 2 , a sintering furnace equipped with a self-closing intake device 10 includes a furnace shell 50, a graphite cavity 60, and a self-closing intake device 10. The furnace shell 50 is provided with an air inlet. The graphite cavity 60 is arranged in the furnace shell 50, and the self-closing intake device 10 is arranged at the bottom of the graphite cavity 60 and penetrates through the side wall of the graphite cavity 60.
[0025] There are two areas in the sintering furnace of the present utility model. One is the graphite cavity 60, that is, the sintering cavity, which is used for high-temperature sintering of the incoming materials. The other is the area between the graphite cavity 60 and the furnace shell 50, which is used for installing various parts and also plays a role in heat insulation, and can be called the heat preservation area. Generally, process gas enters the graphite cavity 60 by setting a pipeline, and the pipeline passes through the heat preservation area and the side wall of the graphite cavity 60 to communicate with the inside of the graphite cavity 60. At the same time, the side wall of the graphite cavity 60 is provided with a conventional intake device. After long-term use, these intake devices will be deformed due to temperature changes. However, due to the setting of the self-closing intake device 10 in the sintering furnace of the present utility model, its special structure makes it not easy to deform, and even if it is deformed, it does not affect the sealing performance. At the same time, the process gas entering the heat preservation area not only serves as the source of the process gas in the graphite cavity 60, but also, because the pressure in the heat preservation area is higher than that in the graphite cavity 60, it can prevent the volatiles such as lipids from escaping and causing air pollution in the workshop, and even affecting the physical health of workers.
[0026] The above-disclosed are only the preferred embodiments of the present utility model. Of course, the scope of rights of the present utility model cannot be limited thereby. Those of ordinary skill in the art can understand the whole or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present utility model still fall within the scope covered by the utility model.
Claims
1. An air intake device with self - closing function, characterized in that: It includes an intake valve seat, an intake valve core, and a counterweight. The intake valve seat and the intake valve core are sleeved and connected. The diameter of the intake valve core is smaller than the inner diameter of the intake valve seat. A hemispherical valve cap is provided at the upper end of the intake valve core, and the radius of the valve cap is larger than the inner diameter of the intake valve seat so that the intake valve core is placed on the intake valve seat. The lower end of the intake valve core extends out of the intake valve seat, and the bottom of the intake valve core is detachably connected to the counterweight. A number of intake holes are provided at the lower end of the intake valve seat, and process gas enters the intake valve seat through the intake holes.
2. The self-closing air intake device according to claim 1, wherein: External threads are provided at the lower end of the intake valve core. Correspondingly, an internal threaded hole is provided at the center of the counterweight, and the intake valve core and the counterweight are threadedly connected.
3. The self-closing air intake device according to claim 2, wherein: A strip-shaped groove is provided on the upper surface of the valve cap to facilitate tightening of the intake valve core and the counterweight.
4. The self-closing air intake device according to claim 1, characterized in that: A conical groove is provided at the upper end of the intake valve seat to maintain the sealing performance between the intake valve seat and the intake valve core.
5. A sintering furnace equipped with a self-closing air intake device, characterized in that: It includes a furnace shell, a graphite cavity, and a self-closing intake device. The furnace shell is provided with an air inlet. The graphite cavity is arranged in the furnace shell, and the self-closing intake device is arranged at the bottom of the graphite cavity and penetrates through the side wall of the graphite cavity.