CN211626115U

CN211626115U - Atmosphere heat treatment furnace

Info

Publication number: CN211626115U
Application number: CN201922273731.4U
Authority: CN
Inventors: 欧阳建; 杨克辉; 彭伟; 宇文静; 张延�; 张炜鹏
Original assignee: Hunan Gold Furnace Science & Technology Co ltd
Current assignee: Hunan Gold Furnace Science & Technology Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-10-02
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses an atmosphere heat treatment furnace, including the furnace body that has furnace, be used for sealing furnace open-ended activity furnace gate and be used for letting in gaseous air intake assembly in to furnace, install heating element in the furnace, air intake assembly is including locating a plurality of air inlets of furnace bottom and the air inlet pipeline that links to each other with a plurality of air inlets, and a plurality of air inlets encircle the furnace interval and set up, and the direction of admission of two arbitrary air inlets is not on same straight line. The utility model has the advantages of simple structure, low cost, easy control, good temperature uniformity and the like.

Description

Atmosphere heat treatment furnace

Technical Field

The utility model relates to the technical field of kiln equipment, concretely relates to atmosphere heat treatment furnace.

Background

The high-temperature atmosphere sintering furnace is widely used for sintering new materials such as powder metallurgy, functional ceramics and the like. The kiln with the sintering temperature of 1500-plus-1800 ℃ generally adopts molybdenum disilicide as a heating element, firstly, because the molybdenum disilicide has large brittleness at normal temperature and plasticity at high temperature, the installation method is preferably vertical suspension so as to avoid element fracture caused by applying mechanical stress on the heating end of the element, but the installation method causes that the heating power of the longitudinal section of the kiln cannot be independently controlled, so that the temperature difference of the longitudinal direction of the kiln is larger, and the general temperature uniformity (reaching +/-10 ℃) of the high-temperature atmosphere sintering furnace with the sintering temperature of 1500-plus-1800 ℃ is poorer; secondly, the reliability of the stability of the equipment in the temperature range is particularly important, on one hand, the reliability of the structure and the elements in a high-temperature environment is required, and the stability of the kiln machinery and the lining needs to be fully considered when designing the kiln; thirdly, the equipment has good sealing performance, on one hand, the integrity is considered during design, holes are formed as few as possible, meanwhile, sealing treatment needs to be carried out on the holes, and on the other hand, the sealing problem of the furnace door needs to be solved, particularly the sealing in a high-temperature pure oxygen environment; finally, from an economic perspective, further improvement of the thermal efficiency of the equipment, reduction of energy consumption, and the like are still needed, including appropriate furnace lining and heat insulation structures, and better energy conservation and consumption reduction means are adopted.

Along with the continuous subdivision of the market, the requirements of product shape complexity, size precision, internal crystalline phase organization structure and the like are higher and higher, and higher requirements are provided for the aspects of kiln sintering temperature uniformity, sealing property, furnace pressure, energy consumption and the like.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the deficiencies of the prior art and provide an atmosphere heat treatment furnace with simple structure, low cost, easy control and good temperature uniformity.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides an atmosphere heat treatment furnace, is including the furnace body that has furnace, be used for sealing furnace open-ended activity furnace gate and be used for letting in gaseous air intake assembly in to furnace, install heating element in the furnace, air intake assembly including locate the furnace bottom a plurality of air inlets and with a plurality of the inlet line that the air inlet links to each other, a plurality of air inlets encircle the furnace interval and set up, and the direction of admitting air of two arbitrary air inlets is not on same straight line.

As a further improvement of the above technical solution:

the air inlet pipeline comprises a concentrated air supply box connected with an air source, the concentrated air supply box is arranged by being attached to the outer wall of the furnace body, and each air inlet is connected with the concentrated air supply box through a branch air pipe.

And a branch flowmeter for adjusting the gas flow in the branch gas pipes is arranged on each branch gas pipe, and the centralized gas supply box is provided with a total flowmeter for adjusting the gas flow entering the centralized gas supply box.

The centralized air supply box is an annular box body arranged around the furnace body.

The atmosphere heat treatment furnace is provided with an exhaust device, the exhaust device comprises two exhaust valves connected with the hearth, and the two exhaust valves are rotary exhaust valves with unequal calibers.

The heating element is U type, and the furnace body roof is run through from furnace inside to the both ends of U type heating element and extends to the furnace body outside, the furnace body outside is equipped with the sealed capsule in gap between U type heating element and the furnace body, the connection of sealed capsule is used for letting in the trachea of process gas.

The bottom of the hearth is provided with a plurality of burning bearing plates for bearing materials through a supporting piece, the plurality of burning bearing plates are mutually spliced to form a flat plate structure, the splicing position of any two adjacent burning bearing plates is provided with at least one vent hole for gas to pass through, and the vent hole is formed by splicing the two adjacent burning bearing plates along respective arranged concave notches.

And a foamed ceramic material furnace lining is arranged on the inner wall of the hearth.

The opening of the hearth is arranged downwards.

The movable furnace door comprises a refractory brick layer, a heat insulation fiber blanket layer and a bottom plate which are sequentially arranged from the inside to the outside of the furnace chamber, a hollow heat insulation cavity is arranged between the heat insulation fiber blanket layer and the bottom plate, a steel wire mesh is arranged in the hollow heat insulation cavity, and the hollow heat insulation cavity is connected with a cooling gas inlet pipe and a cooling gas outlet pipe.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses an atmosphere heat treatment furnace sets up a plurality of air inlets that let in gas in to furnace, and the direction of admission of two arbitrary air inlets is not on same straight line, when letting in gas in to furnace through a plurality of air inlets, can make most gaseous along the rotatory rising of furnace inside wall, can increase gaseous and heating element's contact time, makes gas by quick, abundant heating to the required temperature to improve the temperature homogeneity in the stove. Compared with the prior art of controlling the temperature uniformity by adopting more heating elements or adopting the segmented heating elements, the atmosphere heat treatment furnace also has the advantages of simple structure, low cost and easy control.

Drawings

FIG. 1 is a schematic front view of an atmosphere heat treatment furnace.

FIG. 2 is a schematic structural view of the atmosphere heat treatment furnace in a main sectional view.

FIG. 3 is a schematic sectional view of the heating element mounted on the furnace body.

FIG. 4 is a schematic view of a structure in which a plurality of air inlets are arranged around a furnace.

FIG. 5 is a schematic structural view of a plurality of setter plates spliced with each other.

Illustration of the drawings:

1. a furnace body; 11. a hearth; 12. an air inlet; 13. a centralized gas supply box; 2. a movable oven door; 3. a heating element; 4. a setter plate; 5. and (4) a vent hole.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

As shown in fig. 1 to 4, the atmosphere heat treatment furnace of the present embodiment includes a furnace body 1 having a furnace chamber 11, a movable furnace door 2 for closing an opening of the furnace chamber 11, and an air intake assembly for introducing air into the furnace chamber 11, a heating element 3 is installed in the furnace chamber 11, the air intake assembly includes a plurality of air inlets 12 arranged at the bottom of the furnace chamber 11 and an air intake pipeline connected with the plurality of air inlets 12, the plurality of air inlets 12 are arranged at intervals around the furnace chamber 11, and the air intake directions of any two air inlets 12 are not on the same straight line. This atmosphere heat treatment furnace sets up a plurality of air inlets 12 that let in gas in to furnace 11, and the direction of admitting air of two arbitrary air inlets 12 is not on same straight line, when letting in gas in to furnace 11 through a plurality of air inlets 12, can make most gaseous along the rotatory rise of 11 inside walls of furnace, can increase gaseous and heating element 3's contact time, makes gaseous by quick, abundant heating to the required temperature to improve the temperature homogeneity in the stove. Compared with the prior art of controlling the temperature uniformity by adopting more heating elements 3 or adopting the segmented heating elements, the atmosphere heat treatment furnace also has the advantages of simple structure, low cost and easy control.

In this embodiment, the air inlet pipeline includes a centralized air supply box 13 connected to the air source, the centralized air supply box 13 is disposed adjacent to the outer wall of the furnace body 1, and each air inlet 12 is connected to the centralized air supply box 13 through a branch pipe. The centralized gas supply box 13 is arranged to supply gas to each gas inlet 12, the centralized gas supply box 13 provides a larger space to play a certain role in stabilizing the pressure, and when the total gas amount changes, the gas flow speed of each gas inlet 12 cannot be greatly influenced, so that the stability of a thermal field and a flow in the furnace is facilitated. Meanwhile, the concentrated gas supply box 13 is arranged by being attached to the outer wall of the furnace body 1, partial heat of the furnace body 1 can heat gas in the concentrated gas supply box 13, waste heat utilization is achieved, energy consumption is reduced, and the gas in the concentrated gas supply box 13 is heated firstly and then enters the furnace, so that the positive effect of improving the temperature difference in the furnace is achieved.

In this embodiment, each of the branch pipes is provided with a flow divider for adjusting the gas flow in the branch pipe, so as to adjust the gas flow of each of the gas inlets 12 and achieve the disturbance degree of the gas flow under different temperature conditions. The centralized gas supply box 13 is provided with a total flowmeter for regulating the flow of gas entering the centralized gas supply box 13, and the regulation of the total gas amount can be realized only by regulating the flow of the total flowmeter, so that the requirements of different processes on the atmosphere gas amount are met.

In this embodiment, the concentrated gas supply tank 13 is an annular tank body arranged around the furnace body 1, and can more effectively utilize waste heat.

In this embodiment, the atmosphere heat treatment furnace is provided with an exhaust device, the exhaust device includes two exhaust valves connected to the furnace chamber 11, and the two exhaust valves are rotary exhaust valves with unequal calibers. Because the requirements of the process on furnace pressure and exhaust amount are different in different stages in the sintering process of the atmosphere heat treatment furnace, the opening of the exhaust valve needs to be adjusted to meet the process requirements of furnace pressure in different stages. However, at a high working temperature (for example, 1500-. The rotary exhaust valve with two unequal calibers is adopted, can be flexibly adjusted in multiple modes of full closing, full opening, only large opening and only small opening according to requirements, can meet the exhaust requirements of different stages, is an existing common valve, and has the advantages of low cost, convenience in maintenance and convenience in operation.

In this embodiment, heating element 3 is the U type, and U type heating element 3's both ends run through 1 roof of furnace body from 11 insides of furnace and extend to 1 outsides of furnace body, also heating element 3 adopts the hoist and mount mode to install at 1 top of furnace body, and 1 outsides of furnace body are equipped with the sealed capsule in gap between U type heating element 3 and the furnace body 1, and the connection of sealed capsule is used for letting in process gas's trachea. The process gas is introduced into the sealed cabin through the gas pipe, so that the overheating damage of elements such as the connecting terminal of the U-shaped heating element 3 can be avoided. Meanwhile, the mounting holes for mounting the U-shaped heating elements 3 are intensively arranged on the top wall of the furnace body 1, so that the number of holes formed in the furnace body 1 is reduced, and the sealing performance is improved. In this embodiment, a plurality of heating elements 3 are installed in the furnace 11, and a plurality of heating elements 3 are distributed around the furnace 11, so as to be convenient for controlling the distribution of the heating temperature and the temperature field in the furnace 11, and the heating elements 3 are molybdenum disilicide elements. Preferably, in order to better control the heating temperature and the distribution of the temperature field in the furnace 11, the furnace 11 is divided into a plurality of temperature zones according to needs, and the temperature in the furnace is correspondingly adjusted by adding a temperature control module according to the measured values of the temperature zones. When the heating element 3 adopts a hoisting mode, the gas which rotates and rises is easier to be fully contacted with the heating element 3 to be heated, and the temperature uniformity in the furnace is more favorably improved.

In order to further reduce the temperature difference in the hearth 11, especially the temperature difference in the longitudinal direction of the hearth 11, preferably, a plurality of groups of special U-shaped silicon-molybdenum rods are arranged, the structural shape and the installation mode of the U-shaped silicon-molybdenum rods are the same as those of the U-shaped heating element 3, the length of the heating end is 25-50% shorter than that of a common silicon-molybdenum rod, and the temperature distribution above and below the hearth can be effectively improved through the compensation heating of the heating part of the special U-shaped silicon-molybdenum rods under the control of an independent control loop.

In this embodiment, 11 bottoms of furnace install the polylith through the supporting piece support and are used for bearing the weight of the fever board 4 that holds of material, as shown in fig. 5, polylith holds fever board 4 and splices each other and forms a plate structure, arbitrary two adjacent concatenation departments that hold fever board 4 have at least one air vent 5 that supplies gas to pass through, air vent 5 is formed by the respective indent breach amalgamation that sets up in two adjacent 4 borders of holding fever board, also the border department that splices each other of two adjacent 4 of holding fever board all is equipped with the indent breach, the indent breach amalgamation of two adjacent 4 of holding fever board becomes an air vent 5. The vent holes 5 can be used for allowing gas introduced from the bottom of the hearth 11 to pass through, so that the gas can conveniently flow to the upper part of the hearth 11, and the uniformity of the temperature in the furnace is improved. The vent holes 5 are formed through the concave notches arranged at the edges of the burning bearing plates 4, so that the burning bearing plates 4 bearing materials can be placed close to each other, and the space utilization rate of the hearth 11 can be improved.

In the embodiment, the inner wall of the hearth 11 is provided with the foamed ceramic material furnace lining, so that the possibility of fire penetration at the side part of the furnace body 1 is avoided, the safety of equipment is improved, the thermal expansion rate of the foamed ceramic material furnace lining is almost zero, the density of the foamed ceramic material furnace lining is lower than that of bricks, and the thermal shock property is good. Preferably, a plurality of refractory material blocks are assembled between the furnace lining and the furnace body 1, so that the overall heat-insulating performance of the equipment can be ensured. Preferably, the foamed ceramic material furnace lining is formed by splicing foamed ceramic plates, and is convenient to manufacture, install and maintain.

In this embodiment, the opening of the furnace 11 is arranged downward, that is, the atmosphere heat treatment furnace is a bell jar furnace. In other embodiments, the opening of the hearth 11 can be upward.

In this embodiment, activity furnace gate 2 includes the firebrick layer of following 11 insides of furnace and arranging in proper order to outside direction, thermal-insulated fibre blanket layer and bottom plate, be equipped with a cavity thermal-insulated chamber between thermal-insulated fibre blanket layer and the bottom plate, be equipped with the wire net in the cavity thermal-insulated chamber, the cavity thermal-insulated chamber is connected with cooling gas lets in pipe and cooling gas discharge pipe, let in cooling gas to the cavity thermal-insulated chamber through cooling gas lets in the pipe, gas in the cavity thermal-insulated chamber is discharged through the cooling gas discharge pipe, can form cooling gas flow and cool off wire net and whole activity furnace gate 2. The movable furnace door 2 has good heat insulation performance and high safety.

The above description is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, the modifications and changes obtained without departing from the technical idea of the present invention shall be considered as the protection scope of the present invention.

Claims

1. An atmosphere heat treatment furnace, including furnace body (1) that has furnace (11), be used for sealing furnace (11) open-ended activity furnace gate (2) and be used for to the furnace (11) in the subassembly of admitting air of letting in gas, install heating element (3) in furnace (11), its characterized in that: the air inlet assembly comprises a plurality of air inlets (12) arranged at the bottom of the hearth (11) and a plurality of air inlet pipelines connected with the air inlets (12), the air inlets (12) are arranged around the hearth (11) at intervals, and the air inlet directions of any two air inlets (12) are not on the same straight line.

2. The atmospheric heat treatment furnace of claim 1, wherein: the air inlet pipeline comprises a centralized air supply box (13) connected with an air source, the centralized air supply box (13) is arranged by being attached to the outer wall of the furnace body (1), and each air inlet (12) is connected with the centralized air supply box (13) through a branch air pipe.

3. The atmospheric heat treatment furnace of claim 2, wherein: the branch gas pipes are provided with branch flow meters for adjusting the gas flow in the branch gas pipes, and the centralized gas supply box (13) is provided with a total flow meter for adjusting the gas flow entering the centralized gas supply box (13).

4. The atmospheric heat treatment furnace of claim 3, wherein: the centralized air supply box (13) is an annular box body arranged around the furnace body (1).

5. The atmospheric heat treatment furnace of claim 1, wherein: the atmosphere heat treatment furnace is provided with an exhaust device, the exhaust device comprises two exhaust valves connected with a hearth (11), and the two exhaust valves are rotary exhaust valves with unequal calibers.

6. The atmospheric heat treatment furnace of claim 1, wherein: heating element (3) are the U type, and the both ends of U type heating element (3) run through furnace body (1) roof from furnace (11) inside and extend to furnace body (1) outside, furnace body (1) outside is equipped with the sealed capsule with gap seal between U type heating element (3) and furnace body (1), the connection of sealed capsule is used for letting in process gas's trachea.

7. The atmospheric heat treatment furnace of claim 1, wherein: the utility model discloses a kiln furnace, including furnace (11), furnace (11) bottom is installed the polylith through the supporting piece support and is used for bearing burning board (4) of material, and polylith bears burning board (4) and splices each other and form a flat plate structure, and the concatenation department of arbitrary two blocks of adjacent burning boards (4) has at least one air vent (5) that supply gas to pass through, air vent (5) are formed by the respective indent breach amalgamation that sets up in two blocks of adjacent burning boards (4) border.

8. The atmospheric heat treatment furnace of claim 1, wherein: and a foamed ceramic material furnace lining is arranged on the inner wall of the hearth (11).

9. The atmospheric heat treatment furnace of claim 1, wherein: the opening of the hearth (11) is arranged downwards.

10. The atmospheric heat treatment furnace according to any one of claims 1 to 9, characterized in that: the movable furnace door (2) comprises a refractory brick layer, a heat insulation fiber blanket layer and a bottom plate which are sequentially arranged from the inside to the outside direction of the furnace chamber (11), a hollow heat insulation cavity is arranged between the heat insulation fiber blanket layer and the bottom plate, a steel wire mesh is arranged in the hollow heat insulation cavity, and the hollow heat insulation cavity is connected with a cooling gas inlet pipe and a cooling gas outlet pipe.