Box-type heating and holding furnace for heat treatment

Abstract

The utility model discloses a box-type heating and holding furnace for heat treatment, and belongs to the technical field of heat treatment equipment. Comprising a plurality of heat insulation liner units, and each heat insulation liner unit comprises a plurality of fire-resistant heat insulation bricks; the inner sides of the heat insulation inner container units define an inner combustion flue, and a heating unit is arranged in the inner combustion flue. The peripheries of every two adjacent fire-resistant heat-insulating bricks in the heat-insulating inner container units are sleeved with heat-insulating shells, and air ducts are defined by the heat-insulating shells and the two adjacent fire-resistant heat-insulating bricks in the same heat-insulating inner container unit; a sealing door capable of blocking one end of the inner combustion flue and a sealing cover capable of blocking an opening in one end of the inner combustion flue are arranged at the two ends of the heat insulation shell respectively; the air flue communicates with the inner combustion flue, an air inlet communicating with the inner combustion flue is formed in the sealing door, and an air outlet communicating with the air flue is formed in the heat insulation shell. According to the box-type heating and holding furnace for heat treatment, the temperature of each area in the inner combustion flue can be balanced through circulating airflow, and uniform heating of heat treatment is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat treatment equipment, and particularly relates to a box-type heating and heat preservation furnace for heat treatment. Background Art

[0002] In the processing of metal materials, heat treatment is an important process, and its purpose is to improve the properties and microstructure of materials. As a key equipment in the heat treatment process, the performance of the heating and heat preservation furnace directly affects the effect and quality of heat treatment.

[0003] However, the existing heating and heat preservation furnaces have problems such as uneven heating, high energy consumption, and poor heat preservation effect during use. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a box-type heating and heat preservation furnace for heat treatment, which can balance the temperature of each area in the inner furnace channel through the flowing air flow and ensure uniform heating during heat treatment.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a box-type heating and heat preservation furnace for heat treatment, including multiple groups of heat insulation inner tank units, each group of the heat insulation inner tank units including several refractory heat insulation bricks that can enclose to form an annular structure; the inner sides of the multiple groups of heat insulation inner tank units enclose to form an inner furnace channel, and a heating unit is arranged in the inner furnace channel;

[0006] For two adjacent refractory heat insulation bricks in the same group of heat insulation inner tank units, one side edge of them abuts against each other, and the two adjacent sides form an included angle;

[0007] The outer periphery of the refractory heat insulation brick is sleeved with a heat insulation outer shell, and a wind channel is formed between the heat insulation outer shell and two adjacent refractory heat insulation bricks in the same group of heat insulation inner tank units, and the wind channels formed between the multiple groups of heat insulation inner tank units and the heat insulation outer shell correspond to each other and are communicated;

[0008] Both ends of the heat insulation outer shell are respectively provided with a sealing door capable of sealing one end of the inner furnace channel and a sealing cover capable of sealing one end opening thereof;

[0009] The wind channel is communicated with the inner furnace channel, and an air inlet communicated with the inner furnace channel is arranged on the sealing door, and an air outlet communicated with the wind channel is arranged on the heat insulation outer shell.

[0010] Optionally, a ceramic coating is sprayed on the inner wall of the inner furnace channel.

[0011] Optionally, ceramic fiber cotton is filled between two adjacent refractory heat insulation bricks in the same group of heat insulation inner tank units.

[0012] Optionally, the volume of the ceramic fiber cotton accounts for 1 / 3 to 1 / 2 of the air duct.

[0013] Optionally, the thickness of the ceramic coating is 0.25 mm to 0.5 mm.

[0014] Optionally, the heating unit is an electromagnetic heating coil wound around the side wall of the inner furnace duct.

[0015] Optionally, a plurality of layers of brackets are arranged in the inner furnace duct.

[0016] Optionally, two adjacent heat insulation inner tank units are arranged coaxially and offset.

[0017] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: Parts to be heated can be placed in the inner furnace duct and heated by the heating unit. When heating, a gas with a relatively low oxygen content can be introduced into the inner furnace duct through the air inlet. After passing through the inner furnace duct, the gas will enter the branch duct between the heat insulation outer shell and the refractory heat insulation brick, and then be discharged from the air outlet, so as to form a stable air flow circulation in the inner furnace duct, thereby ensuring that the temperatures in all regions of the inner furnace duct are equal. At the same time, since the air flow in the air duct has a certain temperature, it can form a heat preservation area with a certain temperature between the heat insulation outer shell and the refractory heat insulation brick, so as to reduce the temperature difference between the inside and the outside and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 is a schematic structural diagram of a box-type heating and heat preservation furnace for heat treatment in a preferred embodiment of the present utility model;

[0020] Figure 2 is a schematic top view structural diagram of a box-type heating and heat preservation furnace for heat treatment in a preferred embodiment of the present utility model;

[0021] Figure 3 is in a preferred embodiment of the present utility model Figure 2 a schematic cross-sectional structural diagram taken along line A-A;

[0022] Figure 4 is in a preferred embodiment of the present utility model Figure 2 a schematic cross-sectional structural diagram taken along line B-B;

[0023] Figure 5 is a schematic structural diagram when a plurality of heat insulation inner tank units are arranged together in a preferred embodiment of the present utility model;

[0024] Among them, 1. Heat insulation inner tank unit; 101. Refractory heat insulation brick; 2. Heating unit; 3. Heat insulation outer shell; 4. Sealing door; 5. Sealing cover; 6. Air inlet; 7. Air outlet; 8. Bracket. Detailed implementation mode

[0025] Now, with reference to the accompanying drawings and embodiments, the present utility model will be further described in detail. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0026] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then such directional indications will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Unless otherwise clearly specified and defined, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] As Figures 1 - 5 shown, a box-type heating and heat preservation furnace for heat treatment includes multiple groups of heat insulation inner liner units 1. Each group of heat insulation inner liner units 1 includes several refractory heat insulation bricks 101 that can enclose to form an annular structure. An inner furnace path is formed by enclosing the inner sides of multiple groups of heat insulation inner liner units 1, and a heating unit 2 is arranged in the inner furnace path;

[0028] For two adjacent refractory heat insulation bricks 101 in the same group of heat insulation inner liner units 1, one side edge thereof abuts, and an included angle is formed on its two adjacent sides;

[0029] A heat insulation outer shell 3 is sleeved on the outer periphery of the refractory heat insulation brick 101. A wind channel is formed between the heat insulation outer shell 3 and two adjacent refractory heat insulation bricks 101 in the same group of heat insulation inner liner units 1, and the wind channels formed between multiple groups of heat insulation inner liner units 1 and the heat insulation outer shell 3 correspond to each other and are connected;

[0030] Sealing doors 4 that can block one end of the inner furnace path and sealing covers 5 that can block one end opening are respectively arranged at both ends of the heat insulation outer shell 3;

[0031] The wind channel is connected to the inner furnace path, and an air inlet 6 connected to the inner furnace path is arranged on the sealing door 4, and an air outlet 7 connected to the wind channel is arranged on the heat insulation outer shell 3.

[0032] Specifically, parts to be heated can be placed in the inner furnace passage and heated by the heating unit 2. When heating, a gas with less oxygen content can be introduced into the inner furnace passage through the air inlet 6. After passing through the inner furnace passage, the gas will enter the branch passage between the heat-insulating outer shell 3 and the refractory heat-insulating brick 101, and then be discharged from the air outlet 7, so as to form a stable air flow circulation in the inner furnace passage, thereby ensuring that the temperatures in all regions of the inner furnace passage are equal. At the same time, since the air flow in the air duct has a certain temperature, it can form a heat-preserving region with a certain temperature between the heat-insulating outer shell 3 and the refractory heat-insulating brick 101, so as to reduce the temperature difference between inside and outside and reduce energy loss. Further, the air flow discharged through the air outlet 7 is convenient for heat source recovery, and at the same time, a circulating air path can also be formed between the air outlet 7 and the air inlet 6 through an air pump, an air pipe, etc., so as to reduce energy loss.

[0033] Further, as Figure 5 shown, in order to increase the residence time of the gas with heat in the air duct, thereby increasing its heat preservation effect. Two adjacent heat-insulating inner tank units 1 are arranged coaxially and offset, that is, the two air ducts corresponding to the two heat-insulating inner tank units 1 are offset and communicated. In this technical solution, the one-to-one correspondence of the air ducts means that the number of air ducts formed between one group of heat-insulating inner tank units 1 and the heat-insulating outer shell 3 is equal to the number of air ducts formed between another group of heat-insulating inner tank units 1 and the heat-insulating outer shell 3, and any one of a group of air ducts is only communicated with one of the air ducts in another group.

[0034] The sealing door 4 in this technical solution can be hinged to the heat-insulating outer shell through structures such as hinges and hinges, and can also be fixedly connected to the heat-insulating outer shell through structures such as buckles, so as to facilitate manual operation.

[0035] As described above, a ceramic coating is sprayed on the inner wall of the inner furnace passage. The coating material used for the ceramic coating has a high thermal refractive index, which can reduce heat energy loss and thus improve efficiency.

[0036] As described above, as Figure 4 shown, ceramic fiber cotton is filled between two adjacent refractory heat-insulating bricks 101 in the same group of heat-insulating inner tank units 1. By filling the gaps between the refractory heat-insulating bricks 101 with ceramic fiber cotton, the inner furnace passage is sealed and heat-insulated, and at the same time, gas loss can also be reduced.

[0037] As described above, preferably, the volume of the ceramic fiber cotton accounts for 1 / 3 - 1 / 2 of the air duct to ensure the effect of sealing and heat preservation.

[0038] In this embodiment, preferably, the thickness of the ceramic coating is 0.25 mm - 0.5 mm.

[0039] As Figures 3 - 4As shown, in this technical solution, the heating unit 2 is an electromagnetic heating coil wound around the side wall of the inner furnace passage. The electromagnetic heating coil is an application of the existing electromagnetic induction technology, which can convert electrical energy into heat energy to heat the parts.

[0040] Furthermore, several layers of brackets 8 are arranged in the inner furnace passage for carrying the parts to be processed.

[0041] Working principle: The parts to be heated can be placed in the inner furnace passage, and then the sealing door 4 is closed and the electromagnetic heating coil is powered on. When heating, a gas with less oxygen content can be introduced into the inner furnace passage through the air inlet 6. After passing through the inner furnace passage, the gas will enter the sub-passage between the heat insulation outer shell 3 and the refractory heat insulation brick 101, and then be discharged from the air outlet 7, so as to form a stable air flow circulation in the inner furnace passage, thus ensuring that the temperatures in all areas of the inner furnace passage are equal. At the same time, since the air flow in the air duct has a certain temperature, it can form a heat preservation area with a certain temperature between the heat insulation outer shell 3 and the refractory heat insulation brick 101 to reduce the temperature difference between inside and outside and reduce energy consumption.

[0042] Based on the ideal embodiments of the present invention as inspiration, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A box-type heating and holding furnace for heat treatment, characterized in that: It comprises a plurality of groups of heat-insulating inner liner units (1), each group of the heat-insulating inner liner units (1) comprising a plurality of refractory heat-insulating bricks (101) that can be arranged to form a ring-shaped structure; the inner sides of the plurality of groups of heat-insulating inner liner units (1) are arranged to form an inner furnace channel, and a heating unit (2) is arranged in the inner furnace channel; Two adjacent refractory insulation bricks (101) in the same group of insulation liner units (1) have their one side edges abutting against each other, and their adjacent two sides form an angle; The outer periphery of the refractory heat-insulating brick (101) is provided with a heat-insulating outer shell (3), and an air duct is formed between the heat-insulating outer shell (3) and two adjacent pieces of the refractory heat-insulating brick (101) in the same group of the heat-insulating inner liner units (1), and the air ducts formed between the multiple groups of the heat-insulating inner liner units (1) and the heat-insulating outer shell (3) correspond to each other one by one and are connected; Both ends of the heat-insulating outer shell (3) are respectively provided with a sealing door (4) capable of sealing one end of the inner furnace channel and a sealing cover (5) capable of sealing an opening at one end thereof; The air duct is in communication with the inner furnace duct, and the sealing door (4) is provided with an air inlet (6) in communication with the inner furnace duct, and the heat-insulating outer shell (3) is provided with an air outlet (7) in communication with the air duct.

2. The box-type heating and holding furnace for heat treatment according to claim 1, characterized in that: A ceramic coating is sprayed on the inner wall of the inner furnace channel.

3. The box-type heating and holding furnace for heat treatment according to claim 1, characterized in that: Ceramic fiber wool is filled between two adjacent refractory insulation bricks (101) in the same group of the insulation liner units (1).

4. The box-type heating and holding furnace for heat treatment according to claim 3, characterized in that: The volume of the ceramic fiber cotton accounts for 1 / 3 to 1 / 2 of the air duct.

5. The box-type heating and holding furnace for heat treatment according to claim 2, characterized in that: The thickness of the ceramic coating is 0.25 mm to 0.5 mm.

6. The box-type heating and holding furnace for heat treatment according to claim 1, characterized in that: The heating unit (2) is an electromagnetic heating coil surrounding the side wall of the inner furnace.

7. The box-type heating and holding furnace for heat treatment according to claim 1, characterized in that: Several layers of brackets (8) are arranged in the inner furnace.

8. The box-type heating and holding furnace for heat treatment according to claim 1, characterized in that: Two adjacent heat-insulating liner units (1) are coaxially staggered.

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