TWI770690B - Two-way temperature control gas-tight sintering furnace - Google Patents

Abstract

The present invention provides a bidirectional temperature-controlled air-tight sintering furnace, comprising: an outer furnace and a mobile inner furnace; an accommodating space below the outer furnace can accommodate the inner furnace, and a lifting device on the side is used for accommodating the inner furnace. The inner furnace is sent to the internal positioning, the outer furnace peripheral wall is a heat-resistant structure, and the inner furnace is provided with heating elements and temperature sensing rods, which can provide heating for the upper and middle areas of the interior and detect the instant temperature; the inner furnace has a cart and The cover is covered with a sealing cover, and a heating element is embedded in the surface of the inner furnace, and the surface is provided for placing various fired objects, which can directly heat the lower part of the fired objects. The external gas supply device composed of exhaust pipes is used to provide various atmospheres input in the sealed cover according to different firing objects; the lower part is directly heated through the inner furnace, and the upper part and the inner part are provided with the outer furnace when the internal temperature is uneven or insufficient. The indirect heating in the middle makes the whole sintering furnace achieve the effect of uniform temperature and heat, thereby improving the quality of the sintered products.

Description

Two-way temperature control gas-tight sintering furnace

The present invention relates to the technical category of air-tight sintering furnaces, in other words, it refers to a lift-type air-tight sintering furnace that has internal and external heating functions and can achieve two-way temperature control, so as to maintain the uniform heat effect in the furnace, so as to improve the sintering effect. quality of manufactured products.

According to press, in the manufacturing process of metal material products such as heat pipes, lithium battery powder, graphene, ultra-vacuum thermal conductive plates, etc., different gases need to be introduced into the air-tight sintering furnace for calcination. Calcining is a heating process for metal minerals or other solid materials. Because the sintering process is related to the quality of the heat pipe product, in the sintering process, the first priority is to control the sintering temperature, in order to achieve uniform heating of the product , the party will not produce defective products.

The conventional air-tight sintering furnace usually only has a single heating source, which leads to the inability to accurately control the temperature in the furnace and is unstable, which easily leads to a high defective rate of sintered products. Secondly, in the conventional air-tight sintering furnace, the sealing cover and the base of the furnace are combined. In order to ensure and prevent the gas leakage in the furnace during sintering, a plurality of screws are used around the sealing cover to penetrate and lock the combination. Such an operation not only causes inconvenience and trouble when combining, but also is time-consuming and laborious, and it is difficult to maintain the locking quality, and there is still the possibility of air leakage. In addition, after the sintered material (such as graphene) in the inner furnace is heated and calcined, it is inevitable that molten material will flow down along the periphery of the base and accumulate at the joint of the sealing cover. Even after removing the screw, it is still difficult to open the sealing cover, causing trouble for the operator. The above are the deficiencies that exist in the current conventional technologies, and they are also the ones that the industry needs to solve. the problem.

In view of the lack of conventional technology, the inventor of the present invention has accumulated his professional knowledge in the design and manufacture of precision ceramic technology industrial products for many years.

The main purpose of the present invention is to provide a two-way temperature-controlled air-tight sintering furnace. The inner furnace heats the bottom of the interior and the outer furnace heats the upper and middle parts of the interior, so that the space for firing objects in the inner furnace sealing cover can reach It is indeed the effect of uniform temperature and uniform heat.

Another object of the present invention is to provide a bidirectional temperature-controlled air-tight sintering furnace. A plurality of quick release devices are arranged between the inner furnace and the sealing cover, so that the sealing cover can be quickly combined with the inner furnace to close or separate and open.

Another object of the present invention is to provide a bidirectional temperature-controlled gas-tight sintering furnace, which can provide various gases to enter the sintering space covered by the sealing cover through the external gas supply device provided in the inner furnace, so as to achieve the effect of increasing the sintering temperature. .

Another object of the present invention is to provide a two-way temperature-controlled air-tight sintering furnace. With the corresponding temperature sensing rods in the upper and middle areas of the outer furnace, the real-time temperature can be detected at any time, and heating can be provided in time to accelerate the internal furnace and the inner furnace. The uniform temperature and uniform heat effect inside the sealing cover.

In order to achieve the above objects, the technical means adopted in the present invention is to design a two-way temperature-controlled gas-tight sintering furnace, including: an outer furnace and a mobile inner furnace. The outer furnace is in the shape of a hollow barrel, a number of electrical terminals are arranged on the outer surface of the peripheral wall, and heating elements are arranged inside the peripheral wall. A temperature-sensing rod at a suitable distance to detect the instantaneous temperature of the inner upper and middle regions of the outer furnace; the outer furnace The lower part is an accommodating space, and a lifting device is attached to one side, so that the inner furnace can be sent into/out of the outer furnace by the lifting action after entering the positioning. The inner furnace has a base, a sealing cover and a cart. A heating element is embedded on the surface of the base to provide heating of the inner furnace. The sealing cover covers the base to form a firing space. The cart has a bracket for The base is provided, and there are several quick-release devices, so that the sealing cover can be quickly sealed or separated from the base.

In a preferred embodiment, a temperature sensing rod is arranged in the center of the base surface, and an external gas supply device has an air inlet pipe which penetrates through the base surface and has a relatively long length and a relatively long length. A short exhaust pipe, the other ends of the intake and exhaust pipes extend from the bottom of the base to the position below the handle of the cart, and there is a tar filter device at the end of the exhaust pipe to provide a filter for the entrained gas after combustion. Impurities are then output for use.

In a preferred embodiment, the opening peripheral edge of the sealing cover has a pressing plate protruding outward in a ring, so that the quick device can be pressed and tightly combined.

In a preferred embodiment, the base surface has a plurality of equidistantly arranged and recessed channels to provide embedded heating elements.

In a preferred embodiment, a temperature-sensing rod and an external air supply device are provided upwardly through the center of the disc, consisting of an air inlet pipe longer than the temperature-sensing rod and a shorter than the temperature-sensing rod. Exhaust pipe composition.

In a preferred embodiment, the sealing cover is a hollow cylinder with a certain height, which can fit the cover and cover the base, and can be placed inside the outer furnace without contacting the heat-resistant structure.

In a preferred embodiment, the cart is provided with a power connector for power supply connection on the left side, and a temperature connector on the right side.

(1): External furnace

(11): Heating element

(12): Terminals

(13): Thermometer

(14): accommodating space

(15): Lifting device

(16): Inner furnace temperature gauge

(17): Outer furnace temperature gauge

(2): Inner furnace

(21): Base

(211): Disc

(212): Groove

(213): Channel

(214): heating element

(215): Thermometer

(216): Shelf

(22): External gas supply device

(221): intake pipe

(222): exhaust pipe

(223): Tar filter device

(23): Sealing cover

(231): Platen

(24): Cart

(241): Bracket

(242):Quick release device

(243): Power Connector

(244):Temperature Connector

(25): accumulator device

The first figure is an exploded view of the overall structure of a bidirectional temperature-controlled air-tight sintering furnace according to a preferred embodiment of the present invention.

The second figure is a schematic diagram of the structure of the inner furnace in a preferred embodiment of the present invention.

The third figure is a schematic diagram of the operation of the external gas supply device of the inner furnace in a preferred embodiment of the present invention.

The fourth figure is a schematic diagram (1) of the implementation of the airtight sintering furnace according to a preferred embodiment of the present invention.

The fifth figure is a schematic diagram (2) of the implementation of the airtight sintering furnace according to a preferred embodiment of the present invention.

The sixth figure is a schematic diagram (3) of the implementation of the airtight sintering furnace according to a preferred embodiment of the present invention.

FIG. 7 is a schematic diagram of the implementation of the external gas supply device of the airtight sintering furnace according to a preferred embodiment of the present invention.

Please refer to the first figure, which discloses a preferred embodiment of a bidirectional temperature-controlled gas-tight sintering furnace, the specific structure of which includes: an outer furnace (1) and a mobile inner furnace (2).

Please continue to refer to the first to sixth figures, the upper half of the outer furnace (1) is a hollow barrel shape composed of a heat-resistant structure on the peripheral wall, and heating elements (11) are evenly distributed inside the heat-resistant structure, A plurality of electrical connection terminals (12) are arranged on the outer surface of the peripheral wall, and the heating element (11) is turned on to perform heating by turning on the power supply, so that the outer furnace (1) can provide the effect of external heating; in the outer furnace (1) The inner surface of the peripheral wall is appropriately provided with two temperature sensing rods (13) spaced at appropriate distances, so as to detect the real-time temperature of the upper and middle regions of the outer furnace (1) at any time; The lower half is an accommodating space (14), and a lifting device (15) is attached to one side to allow the inner furnace (2) to enter into the accommodating space (14) for positioning, by means of The inner furnace (2) can be sent into the outer furnace (1) for positioning by the lifting action of the lifting device (15).

The inner furnace (2) further comprises: a base (21), a sealing cover (23) and a cart (24). Wherein the base (21) is a concentric cylinder with different diameters (the upper step is small, the lower step is large), a disc (211) is formed on the top surface, and a groove (212) is arranged on the periphery of the bottom to collect the inner furnace (212). 2) Impurities (such as tar, etc.) that flow down along the periphery of the base (21) after heating and burning; the surface of the disc (211) has a plurality of equally spaced and recessed channels (213), and the inside of the channel (213) A series-connected heating element (214) is embedded so as to generate heat energy after being energized and can be heated by the base (21), and a temperature sensing rod (215) is pierced upward in the center of the disc (211), and An external air supply device (22) is composed of an intake pipe (221) longer than the temperature sensing rod (215) and an exhaust pipe (222) shorter than the temperature sensing rod (215), and is installed in the temperature sensing rod (215) The end of the exhaust pipe (222) is provided with a tar filter device (223) to filter the impurities entrained by the combusted gas before outputting for use. The sealing cover (23) has a certain height and is a hollow cylindrical body with one end closed and one end open. It is necessary to be able to be placed inside the outer furnace (11) without contacting the heat-resistant structure. The sealing cover (23) can fit the cover The base (21) is provided with a pressing plate (231) protruding outwardly on the periphery of the opening, so that the quick device can be pressed and tightly combined. The cart (24) has a bracket (241) on which the base (21) is placed, and a plurality of quick release devices (242) are arranged around the periphery to provide the base (21) when the sealing cover (23) is tightly closed. When the pressure plate (231) is quickly pressed by a plurality of quick release devices (242) to achieve a sure sealing effect; and the air inlet pipe (221) and the exhaust pipe (222) of the external air supply device (22) are connected to each other. It bends and extends from the bottom of the base (21) to the space below the push handle of the cart (24) and is fixed, and the two sides are arranged on A power connector (243) connected with a power supply is arranged on the left side, and a temperature connector (244) is arranged on the right side.

In practice, the objects to be fired, such as heat pipes, lithium battery powder, graphene, ultra-vacuum heat-conducting plates, etc., are placed in the inner furnace (2), that is, the objects to be fired are directly placed on the surface of the base (21), or After the layered rack (216) is used for layering, cover the sealing cover (23), use the quick release device (242) to quickly combine and seal, and push the cart (24) to move the inner furnace (2) to the outer furnace (2). 1) The lower accommodating space (14) is then fed into the barrel-shaped heat-resistant structure above the outer furnace (1) by the lifting device (15), and the heating and the external gas supply device (22) can be started after completion. Introduce suitable gas types, such as nitrogen, hydrogen, nitrogen-hydrogen mixed gas, etc., and heat the temperature to the desired firing temperature according to the type of firing object.

During the heating and firing process, the external gas supply device (22) continuously supplies and inputs the required gas, so that when the external gas is input into the inner furnace (2) through the relatively long air inlet pipe (221), it can be sealed by The upper part of the firing space in the cover (23) is squeezed downward to fill the entire firing space, and the external gas will be exhausted by the relatively short exhaust pipe (222) located below the firing space. gas, it is easier to achieve the uniform heat effect of the firing space inside the inner furnace (2), which can effectively improve the sintering quality of the fired object.

During the firing process, the temperature in the inner furnace (2) can be known from the inner furnace temperature gauge (16) on the front of the body of the outer furnace (1), and the temperature between the inner furnace (2) and the outer furnace (1) is It is known from the outer furnace temperature table (17) on the inner side of the outer furnace (1). There are three inner furnace thermometers (16), which respectively display the real-time temperatures of the upper, middle and lower sections of the temperature sensing rods (214) arranged on the base (21); the outer furnace thermometers (17) have two in total, Then, the instantaneous temperature of the two temperature sensing rods (13) in the upper part and the middle part of the inner peripheral wall of the outer furnace (1) is correspondingly displayed respectively. Since the bottom of the inner furnace (2) is initially heated directly, when the inner furnace temperature gauge (16) indicates that the immediate temperature of the lower section has reached the preset calcining temperature, under normal circumstances, it indicates the inner furnace temperature of the middle section and the upper section. The instantaneous temperature of the meter (16) has not yet reached the demand and is decreasing upward. At this time, the furnace temperature meter (17) located outside the inner side of the outer furnace (1) senses the lack of immediate temperature synchronously, and will automatically start the outer furnace (1). The heating element (11) of the inner furnace (2) is indirectly heated to raise the temperature of the upper part and the middle part of the inner furnace (2) to above the required temperature, so as to make the sealing cover (23) and the base of the whole inner furnace (2) The firing space between (21) achieves the temperature uniformity effect.

Since the gas during the firing process is in a closed space, impurities generated during combustion, such as tar, will be entrained in the exhaust gas. Therefore, the filter device (223) at the end of the exhaust pipe (222) will entrain the exhaust gas. Impurities are filtered and then output for use.

After the fired object has completed the sintering process, it needs to be cooled so that the fired object can be easily taken out. In terms of calcination temperature, it is generally below 1200 degrees Celsius, which varies with different fired objects. Therefore, due to the limitation of aging, forced cooling must be carried out to avoid wasting too much time. After the temperature is lowered to about 3-400 degrees Celsius through the cooling of the sintering furnace, the inner furnace (2) can be lowered and removed from the outer furnace (1) to continue cooling. The forced cooling includes: outdoor cooling and indoor cooling The second is to move the inner furnace (2) outdoors for natural cooling within a predetermined period of time. When the temperature drops to about 150 degrees Celsius, the inner furnace (2) can be moved to an indoor air-conditioning room for further cooling. Cool until the temperature drops to about 50 degrees Celsius. In the above cooling process, since the sealing cover (23) is not disassembled, the external gas supply device (22) still needs to be used to continuously supply gas to keep the gas circulation in the firing space in the sealing cover (23), which can also accelerate cooling.

Please refer to Fig. 7, in order to speed up the process of firing objects and achieve mass production For the purpose, in practice, usually one outer furnace (1) is matched with multiple inner furnaces (2); when the first inner furnace (2) is sintered, the first inner furnace (2) Move to the outside to continue cooling, at this time, the second inner furnace (2) can be sent into the outer furnace (1) for sintering, and so on, without completely interrupting the temperature of the outer furnace (1) again. Heating to the desired target temperature can also save energy consumption. At the same time, when the inner furnace (2) is cooled after being removed from the outer furnace (1), it needs to be connected to an external gas supply device (22). and interface, each group of interfaces can be connected to an inner furnace (2), and the interface can be connected to the air intake pipe (221) on the cart (24) by pipeline, and each group of flowmeters can be connected in series with 3~5 A cart (24) for the inner furnace (2), and so on, to achieve the effect of saving gas.

To sum up, the "two-way temperature-controlled air-tight sintering furnace" of the present invention is unprecedented and has not been disclosed to the market. Moreover, the present invention can indeed solve the deficiencies of conventional technologies, achieve the intended design purpose, and fully meet the requirements of the invention patent. The gist of the application is to file an application in accordance with the law.

(1): External furnace

(12): Terminals

(14): accommodating space

(15): Lifting device

(16): Inner furnace temperature gauge

(17): Outer furnace temperature gauge

(2): Inner furnace

(21): Base

(211): Disc

(2114): Heating element

(215): Thermometer

(22): External gas supply device

(221): intake pipe

(222): exhaust pipe

(223): Tar filter device

(23): Sealing cover

(231): Platen

(24): Cart

(241): Bracket

(242):Quick release device

(243): Power Connector

(244):Temperature Connector

Claims (6)

A bidirectional temperature-controlled air-tight sintering furnace, comprising: an outer furnace, the outer furnace is in the shape of a hollow barrel, a plurality of electrical terminals are arranged on the outer surface of the peripheral wall, and heating elements are arranged in the peripheral wall, and the heating is conducted by turning on the power supply. The element is used for external heating, and two temperature-sensing rods are arranged on the inner surface of the peripheral wall at an appropriate distance to detect the real-time temperature of the upper and middle areas of the outer furnace; the lower part of the outer furnace is an accommodating space, and one side is attached There is a lifting device, which enables the inner furnace to enter/leave the outer furnace by lifting and lowering after entering the positioning; and a mobile inner furnace, which has a base, a sealing cover and a cart, and the top surface of the base has a A heating element is embedded in the disc to provide the heating effect of the inner furnace. A temperature-sensing rod and an external gas supply device are inserted upward through the center of the disc, which is composed of an air inlet pipe and an exhaust pipe. The sealing cover is a A firing space is formed by covering the base, the cart has a bracket to provide the base to place, and is provided with a plurality of quick release devices, so that the sealing cover can be fastened or separated from the base. The bidirectional temperature-controlled air-tight sintering furnace as claimed in claim 1, wherein the external gas supply device has a relatively long intake pipe and a relatively short exhaust pipe passing through the surface of the base The other ends of the intake and exhaust pipes extend from the bottom of the base to the position below the handle of the cart, and there is a filter device at the end of the exhaust pipe to filter the impurities entrained by the combustion gas before outputting for use. According to the bidirectional temperature-controlled airtight sintering furnace described in item 1 of the scope of the patent application, the opening periphery of the sealing cover has a pressing plate protruding outward in a ring, so as to be pressed tightly by the quick device. The bidirectional temperature-controlled air-tight sintering furnace according to the first claim of the patent application scope, wherein the surface of the disc has a plurality of equidistantly arranged and recessed channels to provide embedded heating elements. The bidirectional temperature-controlled air-tight sintering furnace described in item 1 of the scope of the application, wherein the sealing cover has a certain It is necessary to have a highly hollow cylindrical body, which can fit to cover the base, and can be placed inside the outer furnace without contacting the heat-resistant structure. The two-way temperature-controlled air-tight sintering furnace described in claim 1, wherein the cart is provided with a power connector on the left side for power supply connection, and a temperature connector on the right side.

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