Improved exhaust device of airtight sintering furnace

Abstract

The invention provides an improved exhaust device of an airtight sintering furnace, the sintering furnace is provided with a hearth for placing a fired object, the hearth comprises a solid-state battery or a non-solid-state chemical component (such as hydrogen, lithium, acid, alkali and the like) battery and the like, and a thermal insulation material is coated outside the hearth. The upper portion and the lower portion of the interior of the hearth are each provided with a heating device, each heating device is composed of a plurality of heating bodies, each heating body is arranged on the upper portion and the lower portion of the interior of the hearth, and each heating body is covered with a protective pipe, and a plurality of gas input holes and at least one temperature sensing rod are distributed on the peripheral wall face. A plurality of hole channels penetrating through the thermal insulation material are formed in the gap of the protection pipe below the carrier plate, an exhaust device is connected and fixed below the thermal insulation material, covers all the hole channels and is provided with a collecting disc, the bottom surface of the collecting disc is conical, and an exhaust hole is formed in the collecting disc; and the exhaust hole is connected with a breather pipe and extends to a waste gas collector, so that waste gas generated during firing in the hearth is smoothly and quickly exhausted.

Description

Technical Field

[0001] The present invention provides an exhaust improvement device for an airtight sintering furnace, in particular a sintering furnace which can accelerate the exhaust of waste gas (such as carbon dioxide) in the furnace to facilitate continuous sintering requirements. Background Art

[0002] During the product manufacturing process, heat treatment is often required depending on the material's characteristics or requirements. This process can produce different material properties or enhance the material's original physical properties. This heat treatment is commonly accomplished using a variety of airtight sintering furnaces with varying functional requirements. These furnaces are generally categorized by function, including dry hydrogen furnaces, wet hydrogen furnaces, aged furnaces, nitrogen furnaces, and rapid furnaces. In practice, a suitable external gas is introduced into each sintering furnace to prevent oxidation of the sintered product, control carbon potential, remove impurities within the furnace, and purify the furnace atmosphere.

[0003] However, existing sintering furnaces often require the introduction of gas during the sintering process when firing certain items, such as solid-state or liquid-state batteries. However, this introduced gas, after heating and combustion, forms dense carbon dioxide, which is adsorbed in large quantities in the lower half of the furnace. After the fired product is removed from the furnace opening, some waste gas flows out, but it cannot be effectively and completely exhausted, resulting in some residual waste gas. When the next product is placed in the furnace for firing, the waste gas deposited in the lower half of the furnace affects the firing quality of the new product, resulting in incomplete firing. For manufacturers, this undoubtedly increases the probability of scrap and significantly increases costs. Summary of the Invention

[0004] The purpose of the present invention is to provide an airtight sintering furnace exhaust improvement device to effectively solve the problem in the prior art that a large amount of waste gas will remain in the furnace during continuous firing, resulting in poor quality of fired products and unnecessary cost.

[0005] To achieve the above objectives, the inventors of the present application designed an exhaust device combined with an airtight sintering furnace. The sintering furnace is provided with a furnace chamber with a single opening, in which sintered objects are placed. The outside of the furnace chamber is covered with thermal insulation material, and a furnace door that can be opened and closed is provided on one side of the furnace chamber, and the furnace door corresponds to the opening inside the furnace chamber; heating elements are arranged in an arranged manner and covered with protective tubes on the outer layer and used for heating at the upper and lower parts of the furnace chamber, and a carrier plate for carrying sintered objects is provided inside the furnace chamber, and the carrier plate is provided on the protective tube below. The carrier plate has at least one gap, and a plurality of channels penetrating the thermal insulation material are provided at the intervals of the protective tubes arranged in an arranged manner below the furnace chamber, and an exhaust device is provided below the furnace chamber, which has a collecting tray, which is connected and fixed below the thermal insulation material, and the opening size of the collecting tray is larger than all the channels. The bottom surface of the collecting tray is conical and converges with an exhaust hole, and the exhaust hole is connected to a vent pipe, and the other end of the vent pipe extends to an exhaust gas collector.

[0006] In one embodiment, the carrier plate is formed by splicing multiple plates together, and gaps are provided between each plate.

[0007] In one embodiment, the vent pipe is provided with an air injection port corresponding to the fork near the exhaust hole, and is connected to an external air compressor via a pipeline.

[0008] In one embodiment, a plurality of evenly distributed gas inlets are provided on opposite side walls of the furnace to allow the introduction of corresponding firing gases (such as helium, dry hydrogen, air, etc.).

[0009] In one embodiment, at least one temperature sensing rod is protruded from any inner wall surface of the furnace.

[0010] In one embodiment, the fired object is a solid-state battery or a non-solid-state battery with chemical components (such as hydrogen, lithium, acid, alkali, etc.) or a graphene resistor.

[0011] The beneficial effects of the present invention are: The present invention combines an exhaust device with an airtight sintering furnace to accelerate the discharge of waste gas generated in the furnace during the firing process, thereby avoiding adverse effects on the quality of the fired products, greatly improving practicality, and achieving substantial effects such as shortening working hours, reducing costs, and increasing mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] FIG1 is an overall front view of an airtight sintering furnace according to a preferred embodiment of the present invention; FIG2 is a top view of a furnace structure according to a preferred embodiment of the present invention; FIG3 is a diagram showing the internal structure of a furnace according to a preferred embodiment of the present invention; FIG4 is a structural diagram of an exhaust device according to a preferred embodiment of the present invention; FIG5 is a schematic diagram of the exhaust gas flow direction of the exhaust device of a preferred embodiment of the present invention.

[0014] Description of Reference Numerals Sintering furnace 1 furnace 2 Heating tube 21 Carrier board 22 Slit 221 Protection tube 211 Air inlet 23 Temperature sensor 24 Hole 25 Insulation material 3 Exhaust device 5 Exhaust hole 52 Collection tray 51 Ventilation tube 53 Gas injection port 531 Exhaust gas collector 54 Burnt objects 6. DETAILED DESCRIPTION

[0015] Referring to Figure 1, the present invention relates to an airtight sintering furnace exhaust improvement device, comprising: a sintering furnace 1 located in the upper half and a control box panel located in the lower half (not shown). The sintering furnace 1 primarily fires specific firing materials, such as solid-state batteries or non-solid chemical composition batteries (such as lead, acid, hydrogen, alkali, lithium, etc.) or graphene resistors. After being placed, the sintering, melting, debinding, pre-firing, and firing processes are performed as needed. Various compatible gases are injected from the outside in a timely manner to enable the sintering furnace 1 to achieve a variety of different maximum temperature variations. The control box panel is similar to the prior art and at least has operating function keys such as a power switch, status display, heating, cooling, and gas injection. Since the basic structure and function of the sintering furnace 1 are not the focus of this application, they will not be elaborated on here.

[0016] As shown in FIG1 , the sintering furnace 1 has a furnace chamber 2 with a single opening, in which various fired objects are placed. The outside of the furnace chamber 2 is covered with a heat-insulating material 3 , and a closable furnace door (not shown) is provided on one side thereof, and the furnace door corresponds to the opening inside the furnace chamber 2 .

[0017] Please also refer to Figure 1-3As shown, the upper part of the interior of the furnace 2 is provided with heating elements 21 arranged in an array and covered with a protective tube 211 on the outside, and the heating elements 21 have a heating function. A carrier plate 22 is provided below to carry the fired object 6. The carrier plate 22 has at least one gap 221. In this embodiment, the carrier plate 22 is in the form of a plurality of plates spliced together, and a gap 221 is provided between each plate. Below the carrier plate 22, heating elements 21 arranged in an array and covered with a protective tube 211 on the outside are also provided, and the heating elements 21 have a heating function; a plurality of evenly distributed air inlets 23 are provided on the opposite side walls of the furnace 2 to add suitable firing gases such as helium, dry hydrogen, air, etc. as needed, and at least one temperature sensing rod 24 is protruded on any inner wall surface. In this embodiment, the temperature sensing rod 24 on each inner wall surface is designed to have a different height so as to sense the temperature difference between the high and low positions in the furnace 2, thereby improving and achieving consistency in a timely manner. Furthermore, a plurality of circular holes 25 are formed at intervals between the protective tubes 211 arranged below the furnace 2 , and the holes 25 penetrate the heat-insulating material 3 .

[0018] Please also refer to Figure 1 、 Figure 4 As shown, an exhaust device 5 is provided below the furnace 2 of the sintering furnace 1, and the exhaust device 5 is connected and fixed below the thermal insulation material 3. The exhaust device 5 includes a rectangular collecting tray 51. The opening size of the collecting tray 51 must be larger than all the channels 25. The bottom surface of the collecting tray 51 is conical and converges with an exhaust hole 52. The exhaust hole 52 is further connected to a vent pipe 53, and the other end of the vent pipe 53 extends to the exhaust gas collector 54; and an air injection port 531 is provided on the vent pipe 53 corresponding to the fork near the exhaust hole 52, and an external air compressor is connected by a pipeline to provide external pressure to accelerate the discharge of the exhaust gas.

[0019] The other ends of all the air inlets 23 arranged on the inner wall of the furnace 2 are connected to air inlet pipes and are distributed around the outside of the sintering furnace 1 to connect to an external air supply source, so as to introduce external gases such as helium, dry hydrogen, air, etc. into the furnace 2 in a timely manner for combustion protection reaction.

[0020] See also Figure 5 As shown, in practice, the gas after the combustion reaction inside the furnace 2 will flow downward due to the pressure, and the carbon dioxide generated after the gas combustion will flow downward due to its own high density, enter the channel 25 through the gap 221 of the carrier plate 22, and then fall into the collection tray 51, and then enter the ventilation pipe 53 through the convergent exhaust hole 52, and finally flow to the exhaust collector 54.

[0021] According to the above-mentioned sintering furnace 1, a suitable heating method is selected according to the type of the sintered object 6. The combustion reaction generated by injecting different gases through the air inlet 23 is used to make the space temperature in the furnace 2 reach the most suitable temperature for the required heat treatment.

[0022] In practice, when introducing external gas, the type of external gas source is selected. The gas is connected to the interior of the furnace 2 through the corresponding air inlet holes 23. The external gas supply is evenly introduced into the furnace 2 through the multiple air inlet holes 23. After the burning object 6 is heated, burned, and sintered, waste gases such as carbon dioxide generated in the furnace 2 are discharged through the exhaust holes 52, through the vent pipe 53, and then into the waste gas collector 54 outside the sintering furnace 1. Because the gas injection port 531 on the vent pipe 53 can be connected to an external air compressor via a pipeline, the input air pressure can accelerate the exhaust of waste gases, greatly reducing the possibility of defects affecting the burning object 6 in the furnace 2.

[0023] When the furnace 2 of the sintering furnace 1 is cooled, nitrogen gas can be injected from different directions through the air inlet 23 to fill the furnace 2 for nitrogen cooling. When the temperature of the furnace 2 drops to normal, the furnace door is opened to discharge the waste gas.

[0024] In summary, the airtight sintering furnace exhaust improvement device of the present invention can effectively and quickly discharge the waste gas generated in the furnace 2 during the combustion process, avoiding adverse effects on the quality of the fired products. It not only greatly improves practicality, but also contributes to the firing utilization in high-end industries, and effectively solves the problem in the prior art that a large amount of waste gas remains in the furnace 2 under continuous firing, resulting in poor product quality of the fired products and high firing costs.

[0025] However, the above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Therefore, all simple modifications and equivalent structural changes made using the contents of the present invention description and drawings should be included in the patent scope of the present invention.

Claims

1. An airtight sintering furnace exhaust improvement device, wherein the sintering furnace has a single-opening furnace chamber for placing sintered objects therein, is surrounded by a heat-insulating material, and has an openable and closable furnace door provided on one side, the furnace door corresponding to the furnace chamber opening; heating elements are arranged above and below the furnace chamber and are covered with protective tubes for heating, the device being characterized by: A carrier plate for carrying fired objects is provided in the furnace, and the carrier plate is arranged on the protective tube below. The carrier plate has at least one slit. A plurality of holes penetrating the thermal insulation material are provided at the intervals of the protective tubes arranged below the furnace. An exhaust device is provided below the furnace, and the exhaust device has a collecting tray, which is connected and fixed below the thermal insulation material. The opening size of the collecting tray is larger than all the holes. The bottom surface of the collecting tray is conical and converges to an exhaust hole. The exhaust hole is then connected to a vent pipe and extends to an exhaust gas collector.

2. The airtight sintering furnace exhaust improvement device according to claim 1, characterized in that: The carrier plate is formed by splicing multiple plates together, and gaps are provided between each plate.

3. The airtight sintering furnace exhaust improvement device according to claim 1, characterized in that: The ventilation pipe is provided with an air injection port corresponding to the fork near the exhaust hole, and is connected to an external air compressor through a pipeline.

4. The airtight sintering furnace exhaust improvement device according to claim 1, characterized in that: A plurality of evenly distributed air inlets are provided on opposite side walls of the furnace to allow the corresponding firing gases to be added.

5. The airtight sintering furnace exhaust improvement device according to claim 1, characterized in that: At least one temperature sensing rod is protruded from any inner wall surface of the furnace.

6. The airtight sintering furnace exhaust improvement device according to claim 1, characterized in that: The fired product refers to a solid-state battery or a non-solid-state chemical composition battery or a graphene resistor.

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