Box-type hot air circulation system

Abstract

The utility model relates to a box type hot air circulating system, which comprises a furnace body, a heating device and a circulating fan, a heating area and a circulating air duct are arranged in the furnace body, and the circulating air duct comprises side air ducts positioned on two sides of the heating area and a horizontal air duct positioned above the heating area. The heating device is arranged in the horizontal air channel, the power end of the circulating fan is arranged in the upper end of the first side air channel on the input side of the heating area, and a plurality of vortex-shaped air guide plates for guiding hot air to flow into the heating area are arranged in the first side air channel. The input side of the heating area is provided with a flow guide plate assembly capable of adjusting the size of each flow guide ventilation opening. According to the utility model, the uniformity of the heating temperature of the heat treatment equipment is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of heat treatment equipment, and specifically relates to a box-type hot air circulation system. Background Art

[0002] During the heat treatment process of metal material workpieces, the uniformity of heat reception of the workpieces is directly related to the uniformity of internal tissue crystal cells and the stability of mechanical properties. If the workpieces are not heated evenly, a temperature gradient will be formed and thermal stress will be generated, which will affect the product quality of the workpieces. In severe cases, the workpieces will crack or deform. The hot air circulation structure of the heat treatment furnace is the key to ensuring uniform heating of the material area in the furnace chamber.

[0003] In heat treatment equipment, the better the heating uniformity of the heating area, the higher the heat treatment quality of the workpieces. In the prior art, the heating uniformity of heat treatment furnaces can reach ±5°C at best. However, with the continuous transformation and upgrading of the market, this heating temperature uniformity is difficult to meet the production requirements of some industries. For example, industries such as aviation, automotive, and military need to meet the AMS2750 standard. The heat treatment furnace types with traditional air deflector structures have limitations in hot air circulation and often cannot meet the strict temperature uniformity requirements specified by the AMS2750 standard. In order to meet this standard, a common practice in the prior art is to increase the fan power. Although this method can temporarily improve the temperature uniformity in the short term, in the long run, this method not only increases the equipment manufacturing cost but also increases the power consumption and maintenance cost of the equipment.

[0004] The patent with the authorization announcement number CN216845697U discloses a hot air circulation mechanism for a box-type heat treatment furnace. Side air deflector components are provided at the upper, middle, and lower parts of the air deflector mounting frames on both sides of the furnace body. And this mechanism adjusts the magnitude of the circulating air volume in the upper, middle, and lower parts of the furnace body through each side air deflector component, thereby adjusting the temperature uniformity in the furnace to improve the heat treatment quality of the workpieces. However, this mechanism is a traditional hot air circulation method with air intake at the bottom and air outlet at the top of the heating area. After the hot air exits at the top of the heating area, it needs to turn back downward and re-enter the heating area from both sides of the heating area, and its air resistance is relatively large, which will affect the heating uniformity.

[0005] The patent with the authorization announcement number CN205843393U discloses a high-efficiency hot air circulation and diversion device for a heat treatment furnace. The hot air circulation structure of this device also adopts the method of air intake at the bottom and air outlet at the top of the heating area. Although this device arranges structures such as upper horizontal diverters, right vertical diverters, lower horizontal diverters, and left vertical diverters around the heating area to make the hot air form a closed circulation, there will still be relatively large air resistance at the positions where the hot air bends downward and upward, which will affect the heating uniformity. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a box-type hot air circulation system, which greatly improves the uniformity of the heating temperature of the heat treatment equipment.

[0007] The purpose of the present utility model is achieved by the following technical solutions:

[0008] A box-type hot air circulation system includes a furnace body, a heating device and a circulation fan. Inside the furnace body, there are a heating area and a circulation air duct. The circulation air duct includes side air ducts on both sides of the heating area and a horizontal air duct above the heating area. The heating device is arranged in the horizontal air duct. The power end of the circulation fan is arranged inside the upper end of the first side air duct on the input side of the heating area. And there are a plurality of spiral air guiding plates for guiding hot air into the heating area in the first side air duct. A flow guiding plate assembly for adjusting the size of each flow guiding ventilation opening is arranged on the input side of the heating area.

[0009] Each spiral air guiding plate corresponds coaxially to each circulation fan respectively.

[0010] The flow guiding plate assembly includes an adjustable flow guiding plate, a fixed flow guiding plate and a mounting side beam. The left and right ends of the fixed flow guiding plate are respectively fixed on the corresponding mounting side beams. A first flow guiding side baffle is arranged at the lower end of the fixed flow guiding plate. The adjustable flow guiding plate is movably arranged on the corresponding fixed flow guiding plate. And a second flow guiding side baffle is arranged at the upper end of the adjustable flow guiding plate. The flow guiding ventilation opening is formed between the first flow guiding side baffle and the corresponding second flow guiding side baffle.

[0011] The fixed flow guiding plate includes a first flow guiding bottom plate. The left and right ends of the first flow guiding bottom plate are respectively fixed on the corresponding mounting side beams. A first flow guiding side baffle is arranged at the lower end of the first flow guiding bottom plate. The adjustable flow guiding plate includes a second flow guiding bottom plate. And the second flow guiding bottom plate is movably arranged on the first flow guiding bottom plate. A second flow guiding side baffle is arranged at the upper end of the second flow guiding bottom plate.

[0012] A plurality of fixed flow guiding plates are arranged in the second side air duct on the output side of the heating area. And an adjustable flow guiding plate with an adjustable air guiding angle is arranged between the fixed flow guiding plate and the output side of the heating area.

[0013] A bending air guiding plate is arranged at the connection between the second side air duct and the horizontal air duct.

[0014] A furnace lining is arranged inside the furnace body. An inner box body is arranged inside the furnace lining. And the circulation air duct is formed between the inner box body and the heating area.

[0015] The advantages and positive effects of the present utility model are:

[0016] 1. In the present utility model, the heating device is arranged in the horizontal air duct and before the air inlet of the circulation fan. In this way, the hot air formed after being heated by the heating device directly enters the circulation fan for dispersion and stirring, and is output from the air outlet of the circulation fan and directly flows into the heating area along the first side air duct. It does not need to flow through an approximately right-angled bend downward once like in the prior art, which can reduce the air resistance and effectively improve the heating uniformity.

[0017] 2. In the present utility model, a vortex-shaped air guide plate is arranged in the first side air duct to guide the hot air output from the air outlet of the circulation fan into the heating area. The vortex-shaped air guide plate can improve the fan performance. Therefore, the present utility model can improve the heating temperature uniformity without using a fan with a larger power like in the prior art. At the same time, the air resistance of the vortex-shaped air guide plate is relatively small.

[0018] 3. In the present utility model, a deflector plate assembly capable of adjusting the sizes of each diversion ventilation opening is arranged on the input side of the heating area. In this way, the present utility model can adjust the wind speed and air volume of the hot air reaching each point in the heating area according to actual needs, thereby further improving the uniformity of the workpiece heating temperature. And considering factors such as the workpiece shape, processing error, installation error, etc., the present utility model can also ensure that the heat treatment equipment operates in the best state by adjusting the sizes of each diversion ventilation opening of the deflector plate assembly.

[0019] 4. In the present utility model, a fixed deflector plate is arranged in the second side air duct on the output side of the heating area to guide the cold air output from the heating area to blow uniformly and dispersedly towards the heating device. And an adjustable deflector plate capable of adjusting the air guiding angle is arranged between the fixed deflector plate and the output side of the heating area, which can further ensure that the equipment can reach the optimal hot air circulation state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the front view of the utility model,

[0021] Figure 2 is Figure 1 the A-A view in

[0022] Figure 3 is Figure 1 the enlarged view at B in

[0023] Figure 4 is Figure 1 the enlarged view at C in

[0024] Figure 5 is Figure 4 the installation schematic diagram of the air plate hinge shaft in

[0025] Among them, 1 is the furnace body, 101 is the furnace lining, 102 is the inner box body, 103 is the heating area, 2 is the circulation air duct, 201 is the spiral air guide plate, 202 is the adjustable air guide plate, 2021 is the air plate hinge shaft, 2022 is the locking nut, 2023 is the hinge shaft side beam, 203 is the fixed air guide plate, 2031 is the bent air guide plate, 3 is the deflector assembly, 301 is the adjustable deflector, 3011 is the second deflector side baffle, 3012 is the second deflector bottom plate, 302 is the fixed deflector, 3021 is the first deflector side baffle, 3022 is the first deflector bottom plate, 303 is the locking bolt, 304 is the installation side beam, 305 is the deflector ventilation opening, 4 is the heating device, and 5 is the circulation fan. Detailed implementation mode

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] As Figures 1 to 5 shown, the present utility model includes a furnace body 1, a heating device 4 and a circulation fan 5. Among them, a heating area 103 and a circulation air duct 2 are provided inside the furnace body 1. And the circulation air duct 2 includes side air ducts on both sides of the heating area 103 and a horizontal air duct above the heating area 103. The heating device 4 is arranged in the horizontal air duct. The power end of the circulation fan 5 is arranged inside the upper end of the first side air duct on the input side of the heating area 103. And as Figure 2 shown, a plurality of spiral air guide plates 201 for guiding hot air into the heating area 103 are provided inside the first side air duct. And each spiral air guide plate 201 corresponds to each circulation fan 5 coaxially one by one. A plurality of fixed deflectors 203 are provided inside the second side air duct on the output side of the heating area 103. And the cold air output after heat exchange by the heating area 103 flows into the horizontal air duct along each fixed deflector 203. The cold air is heated by the heating device 4 inside the horizontal air duct to form hot air again and flows into the heating area 103 again under the action of the circulation fan 5. Among them, as Figure 1 shown, compared with the prior art, the present utility model firstly arranges the circulation fan 5 inside the upper end of the first side air duct instead of directly above the heating area 103. At the same time, the present utility model arranges the heating device 4 inside the horizontal air duct and before the suction port of the circulation fan 5. In this way, the hot air formed after being heated by the heating device 4 directly enters the circulation fan 5 for dispersion and stirring. And the hot air after dispersion and stirring is output from the air outlet of the circulation fan 5 and directly flows into the heating area 103 along the first side air duct. It does not need to flow downward in an approximately right angle bend like the prior art after output. In this way, the air resistance can be reduced and the heating uniformity can be effectively improved. In addition, as Figure 2As shown, compared with the prior art, the present utility model does not arrange a conventional air deflector in the first side air duct, but uses a vortex-shaped air deflector 201 to guide the hot air output from the air outlet of the circulation fan 5 into the heating area 103. The vortex-shaped air deflector 201 can improve the fan performance. Through experimental measurement, if there is no such vortex-shaped air deflector 201 structure, the fan performance will decrease by more than 50%. Therefore, the present utility model can achieve the purpose of improving the heating temperature uniformity without using a fan with a larger power as in the prior art. At the same time, the wind resistance of the vortex-shaped air deflector 201 is relatively small.

[0028] As Figures 1 to 4 shown, a deflector assembly 3 for adjusting the size of each diversion ventilation opening 305 is provided on the input side of the heating area 103. As Figure 3 shown, the deflector assembly 3 includes an adjustable deflector 301, a fixed deflector 302, and an installation side beam 304. The fixed deflector 302 includes a first diversion bottom plate 3022, and the left and right ends of the first diversion bottom plate 3022 are respectively fixed on the corresponding installation side beams 304. A first diversion side baffle 3021 is provided at the lower end of the first diversion bottom plate 3022. The adjustable deflector 301 includes a second diversion bottom plate 3012, and the second diversion bottom plate 3012 is movably and adjustably arranged on the first diversion bottom plate 3022. A second diversion side baffle 3011 is provided at the upper end of the second diversion bottom plate 3012. The diversion ventilation opening 305 is formed between the first diversion side baffle 3021 and the corresponding second diversion side baffle 3011. When it is necessary to change the size of the diversion ventilation opening 305, the operator only needs to adjust the position of the second diversion bottom plate 3012 relative to the first diversion bottom plate 3022 to change the distance between the second diversion side baffle 3011 and the corresponding first diversion side baffle 3021, thereby achieving the purpose of changing the size of the diversion ventilation opening 305. The purpose of the present utility model adopting the deflector assembly 3 is that due to the various shapes of heat treatment workpieces, and affected by factors such as processing errors and installation errors, it is often difficult to ensure that the equipment is in the best state during the debugging of heat treatment equipment in the prior art. Therefore, the present utility model designs a deflector assembly 3 for adjusting the size of each diversion ventilation opening 305 to adjust the wind speed and air volume of the hot air blowing to each point in the heating area 103, which can not only further improve the uniformity of the workpiece heating temperature, but also ensure that the equipment is in the best state according to the actual situation on site.

[0029] The present utility model can select the adjustment and fixation structure of the second diversion bottom plate 3012 according to actual needs. For example, as Figure 3As shown, multiple groups of adjusting screw holes can be provided on the second diversion bottom plate 3012 along the height direction. The second diversion bottom plate 3012 is fixedly connected to the first diversion bottom plate 3022 through locking bolts 303, and each locking bolt 303 passes through a corresponding group of adjusting screw holes.

[0030] As Figure 3 shown, a plurality of fixed diversion plates 203 are provided in the second side air duct on the output side of the heating area 103, and as Figure 1 and Figures 4 to 5 shown, an adjustable air guide plate 202 is provided between the fixed diversion plate 203 and the output side of the heating area 4. The adjustable air guide plate 202 can adjust the air guide angle according to actual needs. Due to the influence of production manufacturing, installation and various other error factors, in the prior art, it is very difficult to make the equipment in an optimal state during the trial operation of the heat treatment equipment. However, the present utility model can adjust the angle of the adjustable air guide plate 202 according to the actual on-site situation, and then adjust the air outlet guiding angle of the heating area 103, so that the cold air output by the heating area 103 can be evenly dispersed and output, and further enable the equipment to reach an optimal hot air circulation state.

[0031] The adjustable air guide plate 202 can adopt a suitable angle adjustment structure according to actual needs. For example, as Figures 4 to 5 shown, each adjustable air guide plate 202 can be installed on a wind plate hinge shaft 2021. Both ends of the wind plate hinge shaft 2021 are clamped and fixed on the corresponding side hinge shaft side beam 2023 through two locking nuts 2022. When one of the locking nuts 2022 is loosened during adjustment, the wind plate hinge shaft 2021 can rotate and drive the adjustable air guide plate 202 to rotate to achieve angle adjustment. When the adjustable air guide plate 202 is adjusted in place, the operator then tightens the two locking nuts 2022 again to fix the end of the wind plate hinge shaft 2021 on the corresponding side hinge shaft side beam 2023.

[0032] As Figure 1 shown, a bending air guide plate 2031 is provided at the connection between the second side air duct and the horizontal air duct to guide the cold air to blow towards the heating device 4. The fixed diversion plate 203 and the bending air guide plate 2031 can be used to evenly disperse the circulating cold air output by the heating area 103 to ensure that it can evenly blow towards the heating device 4 to achieve uniform heating. In addition, the air outlet side of the heating area 103 can adopt a conventional air outlet structure according to actual needs, or adopt the diversion plate assembly 3 capable of adjusting the size of the diversion ventilation opening 305.

[0033] As Figure 1As shown in the figure, a furnace lining 101 is provided inside the furnace body 1, and an inner box body 102 is provided inside the furnace lining 101. A circulation air duct 2 is formed between the inner box body 102 and the heating area 103. The inner box body 102 is a sealed structure, and the utility model separates the circulation air duct 2 from the furnace lining 101 by using the inner box body 102. This can effectively reduce heat loss and avoid damage to the furnace lining 101 caused by hot air blowing and contamination of the hot air circulation system, thereby reducing product quality.

[0034] The heating device 4 is a well-known technology in the art and is a commercially available product. For example, the heating element in CN216845697U can be adopted.

[0035] The working principle of the utility model is as follows:

[0036] As Figure 1 shown in the figure, first, the utility model arranges the heating device 4 in the horizontal air duct and before the suction port of the circulation fan 5. In this way, the hot air formed after being heated by the heating device 4 directly enters the circulation fan 5 for dispersion and stirring, and is output from the air outlet of the circulation fan 5 and directly flows into the heating area 103 along the first side air duct. It does not need to flow downward in an approximately right-angled bend like the prior art, which can reduce wind resistance and effectively improve heating uniformity.

[0037] As Figure 2 shown in the figure, second, the utility model arranges a vortex-shaped air guide plate 201 in the first side air duct to guide the hot air output from the air outlet of the circulation fan 5 into the heating area 103. The vortex-shaped air guide plate 201 can improve the performance of the fan. Through experimental calculation, if there is no structure of the vortex-shaped air guide plate 201, the fan performance will drop by more than 50%. Therefore, the utility model can achieve the purpose of improving the heating temperature uniformity without using a fan with a larger power like the prior art. At the same time, the wind resistance of the vortex-shaped air guide plate 201 is relatively small.

[0038] As Figure 1 and Figure 3 shown in the figure, third, the utility model is provided with a deflector assembly 3 for adjusting the sizes of the respective diversion ventilation openings 305 on the input side of the heating area 103. In this way, the wind speed and air volume of the hot air blowing to each point in the heating area 103 can be adjusted according to actual needs, thereby further improving the uniformity of the workpiece heating temperature. Considering factors such as the shape of the workpiece, machining errors, and installation errors, the utility model can also ensure that the heat treatment equipment operates in an optimal state by adjusting the sizes of the respective diversion ventilation openings 305 of the deflector assembly 3.

[0039] In addition, as Figure 1 and Figures 4 to 5As shown in the figure, in the second side air duct on the output side of the heating area 103 of the present utility model, a plurality of fixed flow guiding plates 203 are provided to guide the cold air output from the heating area 103 to blow uniformly and dispersedly towards the heating device 4, and an adjustable air guiding plate 202 capable of adjusting the air guiding angle is provided between the fixed flow guiding plate 203 and the output side of the heating area 4. In this way, the present utility model can adjust the air outlet guiding angle of the heating area 103 according to the actual on-site situation, so as to further ensure that the equipment can reach the optimal hot air circulation state.

[0040] In an application example of the present utility model, the set heating temperature of the heat treatment equipment is 550 °C. In this application example, the temperatures of each point in the heating area 103 are detected in real time by a plurality of temperature sensors arranged at different positions in the heating area 103. The maximum detected heating temperature value is 549.6 °C, and the minimum detected heating temperature value is 548.1 °C. Therefore, the present utility model can achieve a temperature uniformity temperature difference of ±2 °C in the working area, thus greatly improving the heating temperature uniformity of the heat treatment equipment.

Claims

1. A box-type hot air circulation system, characterized in that: It includes a furnace body (1), a heating device (4) and a circulation fan (5). Inside the furnace body (1), there is a heating area (103) and a circulation air duct (2). And the circulation air duct (2) includes side air ducts on both sides of the heating area (103) and a horizontal air duct above the heating area (103). The heating device (4) is arranged in the horizontal air duct. The power end of the circulation fan (5) is arranged inside the upper end of the first side air duct on the input side of the heating area (103). And there are a plurality of spiral air guide plates (201) for guiding hot air into the heating area (103) arranged in the first side air duct. A deflector assembly (3) for adjusting the size of each diversion ventilation opening (305) is arranged on the input side of the heating area (103).

2. The box-type hot air circulation system according to claim 1, wherein: Each spiral air guide plate (201) corresponds coaxially to each circulation fan (5).

3. The box-type hot air circulation system according to claim 1, characterized in that: The deflector assembly (3) includes an adjustable deflector (301), a fixed deflector (302) and an installation side beam (304). The left and right ends of the fixed deflector (302) are respectively fixed on the installation side beam (304) on the corresponding side. A first diversion side baffle (3021) is arranged at the lower end of the fixed deflector (302). The adjustable deflector (301) is movably arranged on the corresponding fixed deflector (302). And a second diversion side baffle (3011) is arranged at the upper end of the adjustable deflector (301). The diversion ventilation opening (305) is formed between the first diversion side baffle (3021) and the corresponding second diversion side baffle (3011).

4. The box-type hot air circulation system according to claim 3, characterized in that: The fixed deflector (302) includes a first diversion bottom plate (3022). The left and right ends of the first diversion bottom plate (3022) are respectively fixed on the installation side beam (304) on the corresponding side. A first diversion side baffle (3021) is arranged at the lower end of the first diversion bottom plate (3022). The adjustable deflector (301) includes a second diversion bottom plate (3012). And the second diversion bottom plate (3012) is movably arranged on the first diversion bottom plate (3022). A second diversion side baffle (3011) is arranged at the upper end of the second diversion bottom plate (3012).

5. The box-type hot air circulation system according to claim 1, wherein: A plurality of fixed deflectors (203) are arranged in the second side air duct on the output side of the heating area (103). And an adjustable air guide plate (202) with an adjustable air guide angle is arranged between the fixed deflector (203) and the output side of the heating area (4).

6. The box-type hot air circulation system according to claim 5, wherein: A bending air guide plate (2031) is arranged at the junction of the second side air duct and the horizontal air duct.

7. The box-type hot air circulation system according to claim 1, wherein: A furnace lining (101) is arranged inside the furnace body (1). An inner box body (102) is arranged inside the furnace lining (101). And the circulation air duct (2) is formed between the inner box body (102) and the heating area (103).

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