Air curtain device for dryer

Abstract

The utility model relates to an air curtain device for a dryer. The air curtain device structurally comprises a fan, an air inlet pipe and an air outlet pipe, wherein the fan is arranged on a dryer box body; the air inlet pipe and the air outlet pipe are connected with the fan; the air inlet pipe is connected with the air inlet end of the fan, and the air outlet pipe is connected with the air outlet end of the fan; an air outlet of the air outlet pipe is formed in the inner top of an opening of the dryer, and the air inlet pipe comprises two door-shaped pipes symmetrically arranged on the two sides of the air outlet, an upper longitudinal pipe communicating the two door-shaped pipes and a connecting pipe communicating the upper longitudinal pipe and the draught fan. The two door-shaped pipes are both parallel to the air outlet. The air inlet pipes are arranged on the two sides of the air outlet of the conveying belt and the air outlet of the air curtain, airflow divided by the conveying belt and workpieces on the conveying belt is sucked in, circulation of the airflow is achieved, the problem that the heat preservation effect of an existing dryer is reduced due to the fact that the conveying belt and the workpieces on the conveying belt block the air curtain is solved, and the heat preservation effect of the dryer is improved.

Description

Technical Field

[0001] The utility model relates to an air curtain device, in particular to an air curtain device for a drying machine. Background Art

[0002] The air curtain is an air purification device that uses a high-speed motor to drive a crossflow or centrifugal fan to generate a strong airflow to form an "invisible curtain". This air curtain can not only prevent outdoor bad air from entering the room, keeping the indoor environment clean and comfortable, but also reduce the temperature exchange between indoor and outdoor, improve the energy efficiency of air conditioning, and achieve the purpose of energy saving.

[0003] Chinese utility model patent ZL2016213008720, an air curtain device for a dryer, such as Figure 1 As shown, the air outlet port 9 of the air curtain device is arranged below the conveyor belt, and the air inlet port 8 is installed at the top of the box body 1. When the air curtain device uses the conveyor belt to convey the workpiece into the dryer, the workpiece is blown over by the wind blowing from the bottom up or from both sides, thereby affecting the drying effect and the stability of the workpiece. In addition, due to the existence of the conveyor belt and the workpiece on the conveyor belt, the air curtain that should flow evenly from bottom to top is blocked and cannot smoothly pass through the conveyor belt and the workpiece, which results in the air curtain being unable to fully play its due insulation role. This situation will reduce the insulation effect of the dryer, increase energy consumption, and affect the drying quality and production efficiency of the workpiece. Utility Model Content

[0004] The utility model aims to provide an air curtain device for a dryer, so as to solve the problems of poor heat preservation effect caused by the existing air curtain device blowing over workpieces and the generated air curtain being blocked by a conveyor belt.

[0005] The utility model is implemented as follows: an air curtain device for a dryer, the structure of which includes a fan arranged on a dryer housing and an air inlet pipe and an air outlet pipe connected to the fan; the air inlet pipe is connected to the air inlet end of the fan, and the air outlet pipe is connected to the air outlet end of the fan; the air outlet of the air outlet pipe is arranged on the inner top of the opening of the dryer, and the air inlet pipe includes two door-shaped pipes symmetrically arranged on both sides of the air outlet, an upper longitudinal pipe connecting the two door-shaped pipes, and a connecting pipe connecting the upper longitudinal pipe and the fan; the two door-shaped pipes are parallel to the air outlet.

[0006] Furthermore, the door-shaped tube includes two vertical tubes and an upper horizontal tube connecting the two vertical tubes, an air inlet hole is opened at the lower part of the vertical tube, and the two vertical tubes are arranged oppositely at the two side walls of the dryer box.

[0007] Furthermore, the upper portion of the vertical pipe is inserted into the top plate, and the upper horizontal pipe is located above the top plate.

[0008] Furthermore, the air inlet pipe also includes a lower longitudinal pipe communicating with the lower portions of the two vertical pipes, and air inlet holes are provided on opposite sides of the two lower longitudinal pipes.

[0009] Furthermore, the air outlet of the air outlet pipe faces downward, and the air outlet is in a long strip shape with two ends thereof adjacent to the side walls on both sides of the dryer.

[0010] Furthermore, the vertical tube includes an upper square tube and a lower triangular tube, and an air inlet is provided on the triangular tube.

[0011] Furthermore, one surface of the triangular tube faces the air curtain blown out of the air outlet, and an air inlet hole is provided on the surface, and an angle between the surface and the blowing direction of the air curtain is 45°.

[0012] The utility model provides air inlet pipes on both sides of the conveyor belt and the air curtain outlet to inhale the air flow diverted by the conveyor belt and the workpieces thereon, thereby realizing the circulation of the air flow, solving the problem that the conveyor belt and the workpieces thereon in the existing dryer block the air curtain, causing the heat preservation effect of the dryer to decrease, and improving the heat preservation effect of the dryer. The utility model provides lower longitudinal pipes for air intake at the bottom of both sides of the conveyor belt, further enhancing the circulation effect of the air flow. The lower longitudinal pipes are located on the bottom surface of the dryer, and can collect the air flow blocked by the conveyor belt and the workpieces and flowing to the bottom, and guide it into the air inlet pipe to form a complete air curtain cycle, which not only improves the utilization rate of the air flow, but also further reduces the heat loss of the dryer. The upper part of the vertical pipe of the utility model is penetrated in the top plate, and the upper longitudinal pipe is arranged on the top plate, avoiding passing from below or above the air outlet, preventing the upper longitudinal pipe from blocking the air curtain and the problem that the dryer has a gap at the inlet and outlet, resulting in high energy consumption of the dryer, improving the integrity and effect of the air curtain, and further reducing the heat loss. The utility model arranges the air outlet at the inner top of the opening of the dryer and arranges it downward, which solves the problem in the prior art that the workpiece is easily blown over by the wind. Since the wind blows from top to bottom, the workpiece is less affected by the wind when it is transmitted on the conveyor belt, thereby ensuring the stability of the workpiece and the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an existing air curtain device for a drying machine.

[0014] Figure 2 It is a structural schematic diagram of the utility model.

[0015] Figure 3 It is a structural schematic diagram of the utility model from another angle.

[0016] Figure 4 It is a structural schematic diagram of a drying machine including the utility model.

[0017] In the figure: 1. fan; 2. air inlet duct; 3. air outlet duct; 4. air outlet; 5. dryer casing; 6. conveyor belt; 21. upper longitudinal pipe; 22. connecting pipe; 23. vertical pipe; 24. upper horizontal pipe; 25. lower longitudinal pipe; 26. air inlet hole; 51. side wall; 52. top plate. DETAILED DESCRIPTION

[0018] like Figure 2-Figure 4 As shown, the utility model includes a fan 1 arranged on a dryer housing 5, and an air inlet pipe 2 and an air outlet pipe 3 connected to the fan 1. The air inlet pipe 2 is connected to the air inlet end of the fan 1, and the air outlet pipe 3 is connected to the air outlet end of the fan 1. The air inlet pipe 2 and the air outlet pipe 3 are both penetrated in the top plate 52 of the dryer housing 5. The air outlet 4 of the air outlet pipe 3 is arranged at the inner top of the opening of the dryer housing 5, and the air outlet 4 is in a long strip shape. The two ends of the air outlet 4 are adjacent to the side walls on both sides of the dryer housing 5. The air outlet 4 is arranged downward to ensure that the wind can be blown downward evenly to form an air curtain. This air curtain can effectively prevent external cold air from entering the dryer housing 5, keep the temperature inside the dryer housing 5 stable, and reduce heat loss.

[0019] The air inlet pipe 2 includes two gate-shaped pipes arranged on both sides of the air outlet, an upper longitudinal pipe 21 connecting the two gate-shaped pipes, and a connecting pipe 22 connecting the upper longitudinal pipe 21 and the air inlet end of the fan 1. The two gate-shaped pipes are parallel to the air outlet, and the gate-shaped pipe includes two vertical pipes 23 arranged at two side walls 51 of the dryer housing 5 and an upper horizontal pipe 24 connecting the two vertical pipes 23. An air inlet hole 26 is opened at the lower part of the vertical pipe 23.

[0020] The upper part of the vertical pipe 23 is passed through the top plate 52, and the upper horizontal pipe 24 and the upper longitudinal pipe 21 are both located above the top plate 52, avoiding passing under the air outlet. This can prevent the upper longitudinal pipe 21 from blocking the airflow formed by the wind curtain device, ensuring the integrity and effect of the wind curtain. At the same time, the upper longitudinal pipe 21 is prevented from passing through the gap between the air outlet 4 and the top plate 52, and the air outlet 4 can be close to the top plate 52, avoiding leaving a gap, optimizing the overall structure of the wind curtain device, and further enhancing the sealing and effect of the wind curtain. The fan 1 is set on the top plate 52, which is convenient for installation, commissioning and maintenance, and improves the convenience of operation.

[0021] The vertical pipe 23 is located on both sides of the conveyor belt 6. The upper end of the air inlet 26 on the vertical pipe 23 is higher than the upper end of the conveyor belt 6, and the lower end extends to the inner bottom of the dryer housing 5, so as to suck the airflow diverted by the conveyor belt 6 and the workpieces thereon into the air inlet pipe. The vertical pipe 23 is located on both sides of the conveyor belt 6, and can directly suck the airflow diverted by the conveyor belt 6 and the workpieces thereon. The lower end of the air inlet of the vertical pipe 23 extends to the inner bottom of the dryer housing 5, and the airflow blown out of the air outlet 4 is blocked by the conveyor belt 6 and the workpieces, and flows to the gap between the conveyor belt 6 and the side wall 51, and then is sucked into the air inlet of the vertical pipe 23. The air inlet pipe 2 sucks the air blown out of the air outlet pipe 3 through the air inlet, and then blows it out through the air outlet 4 of the fan 1, thereby realizing the recycling of the airflow.

[0022] The air inlet on the vertical pipe 23 is provided on the side facing the wind curtain. The upper part of the vertical pipe 23 is a square tube, and the lower part of the vertical pipe 23 is a triangular tube. One surface of the triangular tube faces the wind curtain blown out of the air outlet, and this surface directly faces the wind curtain blown out from the air outlet 4. The air inlet is provided on this surface so that the airflow dispersed or diverted by the wind curtain can be smoothly sucked into the vertical pipe 23, thereby realizing the circulation of the airflow. The angle between this surface and the blowing direction of the wind curtain is 45°. Such a design helps to maximize the airflow capture efficiency of the air inlet. The other two surfaces of the triangular tube are coplanar with the two surfaces of the square tube, and another surface of the triangular tube is adjacent to the wall, and the last surface faces away from the blowing area of ​​the air outlet.

[0023] The air inlet pipe 2 further includes two lower longitudinal pipes 25, which are used to connect the lower parts of the two adjacent vertical pipes 23 of the two door-shaped pipes, and air inlet holes 26 are provided on the opposite sides of the two lower longitudinal pipes 25. The lower longitudinal pipes 25 are located on the bottom surface of the dryer housing 5. The lower longitudinal pipes 25 are used to collect the airflow blocked by the conveyor belt 6 and the workpiece and flowing to the bottom, so that the airflow forms a cycle and constitutes a complete air curtain.

[0024] The air inlet holes on the vertical pipe 23 and the air inlet holes on the lower longitudinal pipe 25 can be independent small holes distributed in an array, or can be one or more slits. In this embodiment, the air inlet holes on the vertical pipe 23 and the lower longitudinal pipe 25 are a row of independent small holes, and multiple rows of air inlet holes can be provided to ensure sufficient airflow.

[0025] A lower transverse pipe (not shown in the figure) is arranged between the lower parts of the two vertical pipes 23 on each side of the air outlet 4, and air inlet holes are opened on the opposite sides of the two lower transverse pipes. The lower transverse pipe can further increase the circulation efficiency of the airflow.

[0026] The air inlet holes of the vertical pipe 23 and the lower longitudinal pipe 25 suck the gas blown out of the air outlet 4, forming a circulation between the air outlet 4 and the air inlet pipe 2, reducing the demand for fresh air, thereby reducing energy consumption. At the same time, it reduces the entry of outdoor pollutants, which helps to maintain the cleanliness of the indoor environment.

[0027] A filter element is arranged in the air inlet pipe 2, and the filter element filters the air entering the fan 1, reduces the entry of dust and impurities, and protects the cleanliness and normal operation of the internal components of the air curtain device.

[0028] An air curtain device is installed at the inlet and outlet of the dryer housing 5 to reduce the heat loss in the dryer housing 5. When the dryer is running, the air curtain device at the inlet will form an inward airflow barrier to prevent the external cold air from directly flowing into the dryer housing 5, thereby reducing the heat loss. Similarly, the air curtain device at the outlet will also form an outward airflow barrier to prevent the hot air in the dryer housing 5 from being quickly replaced by the external cold air when it is discharged, further reducing the heat loss.

Claims

1. An air curtain device for a dryer, characterized in that: It includes a fan arranged on a dryer housing and an air inlet pipe and an air outlet pipe connected to the fan; the air inlet pipe is connected to the air inlet end of the fan, and the air outlet pipe is connected to the air outlet end of the fan; the air outlet of the air outlet pipe is arranged on the inner top of the opening of the dryer, and the air inlet pipe includes two door-shaped pipes symmetrically arranged on both sides of the air outlet, an upper longitudinal pipe connecting the two door-shaped pipes, and a connecting pipe connecting the upper longitudinal pipe and the fan; the two door-shaped pipes are parallel to the air outlet.

2. The air curtain device for a dryer according to claim 1, characterized in that: The door-shaped pipe comprises two vertical pipes and an upper horizontal pipe connecting the two vertical pipes. An air inlet hole is opened at the lower part of the vertical pipe. The two vertical pipes are arranged oppositely at the two side walls of the drying machine box.

3. The air curtain device for a dryer according to claim 2, characterized in that: The upper portion of the vertical pipe is inserted into the top plate of the dryer housing, and the upper horizontal pipe is located above the top plate of the dryer housing.

4. The air curtain device for a dryer according to claim 2, characterized in that: The air inlet pipe also includes a lower longitudinal pipe communicating with the lower parts of the two vertical pipes, and air inlet holes are provided on opposite sides of the two lower longitudinal pipes.

5. The air curtain device for a dryer according to claim 1, characterized in that: The air outlet of the air outlet pipe faces downward, and the air outlet is in a long strip shape with two ends thereof adjacent to the side walls on both sides of the dryer.

6. The air curtain device for a dryer according to claim 2, characterized in that: The vertical pipe comprises an upper square pipe and a lower triangular pipe, and an air inlet is provided on the triangular pipe.

7. The air curtain device for a dryer according to claim 6, characterized in that: One surface of the triangular tube faces the air curtain blown out of the air outlet, an air inlet hole is provided on the surface, and an angle between the surface and the blowing direction of the air curtain is 45°.

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