Direct combustion type hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, in particular to a direct combustion type hot blast stove which comprises a box body, a fan, a fire damper and a driving structure, a stove body is fixedly connected in the box body, a combustor is fixedly connected in the middle of one end of the box body, and the output end of the combustor extends into the stove body. The top of one end of the box body is fixedly connected with a backdraft pipe, the backdraft pipe is communicated with the furnace body, the bottom of the box body is fixedly connected with an air inlet pipe below the combustor, the middle part of one side of the box body is fixedly connected with a fan, the bottom of the box body is fixedly connected with an air outlet pipe below the fan, and a filter is fixedly connected between the fan and the combustor in the box body; a fire damper is arranged at the end, away from the combustor, of the box body, a driving structure used for driving the fire damper to move is installed at the end, close to the fire damper, of the box body, and the direct combustion type hot blast stove has the advantages of being accurate in temperature control, capable of saving energy and reducing consumption, safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of hot blast stove technology, and in particular to a direct combustion hot blast stove. Background Technology

[0002] A direct combustion hot air furnace is a thermal energy device that generates high-temperature gas by directly burning natural gas and mixing it with air to form hot air. Its core structure includes a burner, furnace body, fan, and air supply duct. During operation, natural gas is mixed with combustion air in the burner and the generated high-temperature gas is mixed with cooling air in the furnace body to form hot air with a controllable temperature. The hot air is then transported to drying, heating, and other process equipment by the fan. This technology has the advantages of high thermal efficiency and fast response speed and is widely used in industrial drying, coating curing, agricultural greenhouse heating and other fields.

[0003] Traditional hot air furnaces generally use fixed baffles, which cannot dynamically adjust the opening according to real-time temperature requirements. For example, in the wood drying process, high temperature and rapid dehumidification are required in the early stage, and low temperature shaping is required in the later stage. Fixed baffles cannot meet the temperature requirements of different stages, resulting in a low product qualification rate.

[0004] Therefore, it is necessary to provide a new direct-fired hot blast stove to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a direct combustion hot air furnace.

[0006] The direct-fired hot air furnace provided by this utility model includes: a housing, a fan, a baffle plate, and a drive structure. A furnace body is fixedly connected inside the housing. A burner is fixedly connected to the middle of one end of the housing, and the output end of the burner extends into the furnace body. A combustion recovery pipe is fixedly connected to the top of one end of the housing and communicates with the furnace body. An air inlet pipe is fixedly connected to the bottom of the housing below the burner. A fan is fixedly connected to the middle of one side of the housing. An air outlet pipe is fixedly connected to the bottom of the housing below the fan. A filter is fixedly connected inside the housing between the fan and the burner. A baffle plate is provided at the end of the housing away from the burner. A drive structure for moving the baffle plate is installed at the end of the housing near the baffle plate.

[0007] Preferably, the drive structure includes: a protective box, a worm gear, a threaded rod, and a worm. The protective box is fixedly connected to one end of the box near the fire baffle. The worm gear is rotatably connected inside the protective box. The inner wall of the worm gear is threaded. The threaded rod is threadedly connected to the inner wall of the worm gear. One end of the threaded rod is fixedly connected to the fire baffle. The worm is rotatably connected inside the protective box. The worm meshes with the worm gear.

[0008] Preferably, a motor is fixedly connected inside the protective box, and the output end of the motor is fixedly connected to the worm gear.

[0009] Preferably, the end of the baffle plate near the burner is equidistantly connected to multiple sets of sliding columns, and the outer wall of the burner is provided with multiple sets of sliding grooves at equal intervals, and the sliding columns slide in the sliding grooves.

[0010] Preferably, the outer wall of the burner has multiple sets of heat dissipation holes at equal intervals.

[0011] Preferably, the heat dissipation holes and the sliding grooves are arranged alternately.

[0012] Preferably, the outer wall of the threaded rod is provided with multiple sets of internal splines at equal intervals, and the protective box and the box body are provided with external splines at their respective ends that are close to each other. The external splines are slidably connected to the internal splines.

[0013] Preferably, a sealing ring is installed at the end of the protective box that is close to the box body, and the sealing ring is slidably connected to the threaded rod.

[0014] Compared with related technologies, the direct combustion hot blast stove provided by this utility model has the following beneficial effects:

[0015] Precise and flexible adjustment of the fire baffle:

[0016] By driving a worm gear and worm wheel with a motor, which in turn drives a threaded rod, the baffle plate can be infinitely adjusted, thereby controlling the temperature inside the hot air furnace. This allows the hot air furnace to adapt well to temperature-sensitive processes such as drying and curing, further improving energy efficiency and reducing operating costs. Attached Figure Description

[0017] Figure 1 A schematic diagram of the direct combustion hot air furnace provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows the internal structure of the box.

[0019] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the protective box.

[0020] The following are the labels in the diagram: 1. Housing; 2. Furnace body; 3. Burner; 4. Flame recovery tube; 5. Air inlet pipe; 6. Fan; 7. Air outlet pipe; 8. Protective box; 9. Worm gear; 10. Threaded rod; 11. Motor; 12. Sliding column; 13. Sliding groove; 14. Heat dissipation hole; 15. Internal spline; 16. External spline; 17. Sealing ring; 18. Worm gear; 19. Filter; 20. Fire baffle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0022] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0023] Please see Figures 1 to 3 A direct-fired hot blast stove includes: a housing 1, a blower 6, a baffle plate 20, and a drive structure. A furnace body 2 is fixedly connected inside the housing 1. A burner 3 is fixedly connected to the middle of one end of the housing 1, with the output end of the burner 3 extending into the furnace body 2. A combustion recovery pipe 4 is fixedly connected to the top of one end of the housing 1, communicating with the furnace body 2. An air inlet pipe 5 is fixedly connected to the bottom of the housing 1 below the burner 3. A blower 6 is fixedly connected to the middle of one side of the housing 1, and an air outlet pipe 5 is fixedly connected to the bottom of the housing 1 below the blower 6. The air duct 7 and the housing 1 are fixedly connected to a filter 19 between the fan 6 and the burner 3. A baffle plate 20 is provided at the end of the housing 1 away from the burner 3. A drive structure for moving the baffle plate 20 is installed at the end of the housing 1 near the baffle plate 20. Multiple sets of sliding columns 12 are equidistantly rotatably connected at the end of the baffle plate 20 near the burner 3. Multiple sets of sliding grooves 13 are equidistantly opened on the outer wall of the burner 3. The sliding columns 12 slide in the sliding grooves 13. Multiple sets of heat dissipation holes 14 are equidistantly opened on the outer wall of the burner 3. The heat dissipation holes 14 and the sliding grooves 13 are staggered.

[0024] It should be noted that the air diffusers on the outer wall of the burner 3 are arranged in a ring and uniformly, so that the high-temperature gas can be diffused more evenly in the furnace body 2 and avoid local overheating. The air diffusers and the slide groove 13 are staggered to ensure airflow distribution and prevent structural strength from being weakened.

[0025] Please see Figure 1 and Figure 3 The drive structure includes: a protective box 8, a worm gear 9, a threaded rod 10, and a worm 18. The protective box 8 is fixedly connected to one end of the box 1 near the fire baffle 20. The worm gear 9 is rotatably connected inside the protective box 8. The inner wall of the worm gear 9 is threaded. The threaded rod 10 is threadedly connected to the inner wall of the worm gear 9. One end of the threaded rod 10 is fixedly connected to the fire baffle 20. The worm 18 is rotatably connected inside the protective box 8. The worm 18 meshes with the worm gear 9. The motor 11 is fixedly connected inside the protective box 8. The output end of the motor 11 is fixedly connected to the worm 18. Multiple sets of internal splines 15 are equidistantly provided on the outer wall of the threaded rod 10. External splines 16 are provided at the ends of the protective box 8 and the box 1 that are close to each other. The external splines 16 are slidably connected to the internal splines 15. A sealing ring 17 is installed at the ends of the protective box 8 and the box 1 that are close to each other. The sealing ring 17 is slidably connected to the threaded rod 10.

[0026] It should be noted that the sealing ring 17 at the connection between the protective box 8 and the box body 1 is fitted onto the threaded rod 10 to prevent dust and moisture from entering the drive structure and to extend the life of the motor 11, worm gear 9, and worm 18.

[0027] The working principle of the direct combustion hot blast stove provided by this utility model is as follows:

[0028] Combustion and heat exchange process:

[0029] When the burner 3 is started, it ignites the natural gas, producing a high-temperature flame and gas. The output end of the burner 3 extends into the furnace body 2, directly injecting high-temperature gas into the furnace body 2, causing the internal temperature of the furnace body 2 to rise rapidly to the set value. The air inlet pipe 5 is located below the burner 3, and ambient air is forced in by the fan 6. Part of the air participates in the combustion reaction as combustion air, while the other part flows along the gap between the furnace body 2 and the inner wall of the box 1 to cool the box 1 and prevent the outer shell from overheating. The high-temperature gas and the cooling air mix in the furnace body 2 to form hot air with a controllable temperature. The fan 6 extracts the hot air through the air outlet pipe 7 and delivers it to the drying, heating and other process equipment. When the fan 6 extracts the hot air, the hot air will flow through the filter 19 for filtration. The combustion return pipe 4 connects the furnace body 2 and the burner 3, circulating part of the high-temperature exhaust gas to the combustion zone, improving energy utilization and reducing nitrogen oxide emissions.

[0030] Adjustment of fire baffle 20:

[0031] When it is necessary to adjust the baffle plate 20, start the motor 11, and the output shaft drives the worm 18 to rotate. The worm 18 meshes with the worm wheel 9, converting the rotational motion into the rotation of the worm wheel 9. The thread on the inner wall of the worm wheel 9 cooperates with the threaded rod 10, causing the threaded rod 10 to move linearly along the axial direction. One end of the threaded rod 10 is fixedly connected to the baffle plate 20, thereby driving the baffle plate 20 to move horizontally, so that the baffle plate 20 can move closer to or further away from the furnace body 2.

[0032] Fire baffle 20 opening control:

[0033] Fully open state: The threaded rod 10 moves away from the furnace body 2, the baffle plate 20 is fully opened, allowing the high-temperature gas to mix fully with the cooling air, and outputting the highest flow rate of high-temperature hot air;

[0034] Half-open state: By controlling the start and stop time of motor 11 and adjusting the stroke of threaded rod 10, the baffle plate 20 partially blocks the outlet of furnace body 2. At this time, the hot air stays in furnace body 2 for a longer time, and the heat exchange efficiency is improved.

[0035] Closed state: The fire baffle 20 is fully closed, cutting off the main hot air channel, which is used for equipment shutdown or emergency cooling to shorten the response time.

[0036] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A direct-fired hot blast stove, characterized in that, include: Box (1), furnace body (2) is fixedly connected inside the box (1), burner (3) is fixedly connected to the middle of one end of the box (1), the output end of the burner (3) extends into the furnace body (2), a burner pipe (4) is fixedly connected to the top of one end of the box (1), the burner pipe (4) is connected to the furnace body (2), and an air inlet pipe (5) is fixedly connected to the bottom of the box (1) below the burner (3). A fan (6) is fixedly connected to the middle of one side of the housing (1). An air outlet pipe (7) is fixedly connected to the bottom of the housing (1) below the fan (6). A filter (19) is fixedly connected inside the housing (1) between the fan (6) and the burner (3). Fire baffle (20) is provided at the end of the housing (1) away from the burner (3); The drive structure is installed at one end of the housing (1) near the fire baffle (20) for driving the fire baffle (20) to move.

2. The direct-fired hot blast stove according to claim 1, characterized in that, The drive structure includes: a protective box (8), a worm gear (9), a threaded rod (10), and a worm (18). The protective box (8) is fixedly connected to one end of the box (1) near the fire baffle (20). The worm gear (9) is rotatably connected inside the protective box (8). The inner wall of the worm gear (9) is threaded. The threaded rod (10) is threadedly connected to the inner wall of the worm gear (9). One end of the threaded rod (10) is fixedly connected to the fire baffle (20). The worm (18) is rotatably connected inside the protective box (8). The worm (18) meshes with the worm gear (9).

3. The direct-combustion hot blast stove according to claim 2, characterized in that, The protective box (8) has a motor (11) fixedly connected inside, and the output end of the motor (11) is fixedly connected to the worm (18).

4. The direct-fired hot blast stove according to claim 1, characterized in that, The fire baffle (20) is equidistantly connected to a number of sliding columns (12) at one end near the burner (3). The outer wall of the burner (3) is provided with a number of sliding grooves (13) at equal intervals. The sliding columns (12) slide in the sliding grooves (13).

5. The direct-fired hot blast stove according to claim 1, characterized in that, Multiple sets of heat dissipation holes (14) are equidistantly opened on the outer wall of the burner (3).

6. The direct-combustion hot blast stove according to claim 5, characterized in that, The heat dissipation holes (14) and the slides (13) are arranged alternately.

7. The direct-fired hot blast stove according to claim 2, characterized in that, Multiple sets of internal splines (15) are equidistantly provided on the outer wall of the threaded rod (10). External splines (16) are provided at the ends of the protective box (8) and the box body (1) that are close to each other. The external splines (16) are slidably connected to the internal splines (15).

8. The direct-fired hot blast stove according to claim 7, characterized in that, A sealing ring (17) is installed at one end of the protective box (8) and the box body (1) that are close to each other. The sealing ring (17) is slidably connected to the threaded rod (10).

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