An airflow regulating device for easy use in dilution fans

Abstract

This utility model discloses an airflow regulating device for a dilution fan, relating to the technical field of steel rolling auxiliary equipment. It includes an air inlet box, with a suction pipe installed on one side of the upper end of the air inlet box. One side of the suction pipe is connected to the suction end of the dilution fan. An air inlet is provided on one side of the air inlet box. An air outlet pipe is connected to the air outlet end of the dilution fan, and a solenoid valve is connected to one end of the air outlet pipe. One end of the solenoid valve is connected to the inlet end of the descending flue via a connecting pipe. A water curtain cooling component is installed on the side of the air inlet box near the air inlet. A controller is installed at the top of the air inlet box. In this utility model, a temperature sensor detects the temperature of the flue gas in the descending flue in real time and transmits the temperature information to the controller. The controller controls the opening and closing of the solenoid valve and the blowing speed of the dilution fan, thereby automatically controlling the amount of cold air. This enables precise protection of the metal preheater in the flue, extends the service life of the equipment, and reduces operating costs.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling auxiliary equipment technology, and in particular to an air volume regulating device that is easy to use for dilution fans. Background Technology

[0002] Dilution fans are cooling devices installed at the inlet of the downdraft flue of hot-rolled steel heating furnaces to protect the metal preheaters in the flue. To fully utilize the waste heat of the high-temperature flue gas and save fuel in the hot-rolled heating furnace, dual preheating of combustion air and fuel gas is commonly used. Metal preheaters are frequently used for this purpose. Since the metal preheaters are made of steel, there are certain limitations on the high-temperature resistance of the steel structure. Excessively high flue gas temperatures can damage the steel structure. To protect the metal preheaters and the preheated gas, dilution fans are often used to protect the flue equipment. Originally, the cooling air volume was supplied by controlling the size of the air intake. However, due to less than ideal on-site conditions, it is difficult to control the size of the air intake, leading to frequent issues that could negatively impact the protection of the preheaters. This results in frequent equipment replacements, high operating costs, and the potential safety hazard of gas preheater leaks.

[0003] The prior art can be referenced in Chinese Patent No. CN110436754A, which discloses a bottom cooling device for the cooling section of a glass furnace. The device is characterized by a blower on one side of the cooling section of the glass furnace, an air supply pipe connected to one end of the blower, a horizontal pipe connected to one end of the air supply pipe, a set of air ducts extending to the bottom of the cooling section of the glass furnace connected in parallel on the horizontal pipe, and a set of air outlets on the air ducts corresponding to the bottom bricks of the cooling section of the furnace. However, this cooling device is used for the bottom of the cooling section of the glass furnace and uses the blower flow rate to achieve the cooling temperature of the molten glass, making it impossible to adjust the air volume in a timely manner.

[0004] Therefore, an airflow regulating device that is easy to use for dilution fans is provided. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an airflow regulating device for dilution fans. It uses a temperature sensor to detect the temperature of the flue gas in the downdraft in real time and transmits the temperature information to a controller. The controller controls the opening and closing of the solenoid valve and the blowing speed of the dilution fan to automatically control the amount of cold air. This enables precise protection of the metal preheater in the flue, extends the service life of the equipment, reduces the operating cost of the equipment, and overcomes the shortcomings of existing technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for regulating airflow in a dilution fan includes an air inlet box, an air suction pipe installed on one side of the upper end of the air inlet box, one side of the air suction pipe connected to the air suction end of the dilution fan, an air inlet on one side of the air inlet box, an air outlet connected to the air outlet end of the dilution fan, a solenoid valve connected to one end of the air outlet pipe, one end of the solenoid valve connected to the inlet end of the descending flue via a pipe, a water curtain cooling component installed on the side of the air inlet box located at the air inlet, and a controller installed on the top of the air inlet box.

[0008] As a further embodiment of this utility model: the water curtain cooling component includes a water pipe fixed to the top of the inner wall of the air inlet box, spray nozzles are installed at equal intervals on the water pipe, one end of the water pipe extends to the outside of the air inlet box and is connected to a water supply valve, and one end of the water supply valve is connected to a water supply device.

[0009] As a further improvement of this utility model: a temperature sensor is located on the descending flue near the inlet end, and the detection head of the temperature sensor is located inside the descending flue.

[0010] As a further improvement of this utility model, the temperature sensor, the solenoid valve, and the drive motor of the dilution fan are all electrically connected to the controller.

[0011] As a further improvement of this utility model, a filter screen is installed on the inner wall of the air inlet box.

[0012] As a further improvement of this utility model, the water pipe is located between the filter screen and the air inlet.

[0013] As a further improvement of this utility model: a drain pipe is connected to the bottom of one side of the air inlet box, and the drain pipe is connected to a water resource recycling device.

[0014] As a further improvement of this utility model, a side door is provided on the other side of the air inlet box.

[0015] The beneficial effects of this utility model are as follows:

[0016] Temperature sensors detect the temperature of flue gas in the downdraft in real time and transmit the temperature information to the controller. The controller controls the opening and closing of the solenoid valve and the blowing speed of the dilution fan to automatically control the amount of cold air. This enables precise protection of the metal preheater in the flue, extends the service life of the equipment, and reduces the operating cost. Attached Figure Description

[0017] Figure 1 This is a first-view three-dimensional structural diagram of an airflow regulating device for use in dilution fans, as proposed in this utility model.

[0018] Figure 2This is a second-view three-dimensional structural diagram of an airflow regulating device for use in dilution fans, as proposed in this utility model.

[0019] Figure 3 This is a third-view perspective three-dimensional structural diagram of an airflow regulating device for use in dilution fans, as proposed in this utility model.

[0020] Figure 4 This utility model proposes an airflow regulating device that is easy to use with dilution fans. Figure 3 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Air inlet box; 2. Temperature sensor; 3. Downdraft flue; 4. Connecting pipe; 5. Air outlet pipe; 6. Dilution fan; 7. Solenoid valve; 8. Suction pipe; 9. Water supply valve; 10. Filter screen; 11. Drain pipe; 12. Side door; 13. Water pipe; 14. Air inlet; 15. Spray head; 16. Controller. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Example 1, referring to Figure 1-4 A device for adjusting the air volume of a dilution fan includes an air inlet box 1, an air suction pipe 8 installed on one side of the upper end of the air inlet box 1, one side of the air suction pipe 8 connected to the air suction end of the dilution fan 6, an air inlet 14 provided on one side of the air inlet box 1, an air outlet pipe 5 connected to the air outlet end of the dilution fan 6, a solenoid valve 7 connected to one end of the air outlet pipe 5, and one end of the solenoid valve 7 connected to the inlet end of the descending flue 3 via a pipe 4. A water curtain cooling component is provided on one side of the air inlet box 1 located at the air inlet 14, and a controller 16 is installed on the top of the air inlet box 1.

[0024] Temperature sensor 2 is located on the descending flue 3 near the inlet end, and the detection head of temperature sensor 2 is located inside the descending flue 3.

[0025] Temperature sensor 2, solenoid valve 7 and the drive motor of dilution fan 6 are all electrically connected to controller 16.

[0026] Connect the pipe 4 on the solenoid valve 7 to the inlet side of the descending flue 3. The temperature sensor 2 detects the temperature of the flue gas in the descending flue 3 in real time and transmits the temperature information to the controller 16. The controller 16 controls the opening and closing of the solenoid valve 7 and the blowing speed of the dilution fan 6 to automatically control the amount of cold air. This can achieve precise protection of the metal preheater in the flue, extend the service life of the equipment, and reduce the operating cost of the equipment.

[0027] Example 2 is an optimization based on Example 1, specifically:

[0028] The water curtain cooling component includes a water pipe 13 fixed to the top of the inner wall of the air inlet box 1. Spray heads 15 are installed at equal intervals on the water pipe 13. One end of the water pipe 13 extends to the outside of the air inlet box 1 and is connected to a water supply valve 9. One end of the water supply valve 9 is connected to a water supply device. A filter screen 10 is installed on the inner wall of the air inlet box 1. The water pipe 13 is located between the filter screen 10 and the air inlet 14. A drain pipe 11 is connected to the bottom of one side of the air inlet box 1. The drain pipe 11 is connected to a water resource recycling device. A side door 12 is provided on the other side of the air inlet box 1.

[0029] When the water supply valve 9 is opened, each spray head 15 sprays water simultaneously at the air inlet 14 to form a water curtain. During the operation of the dilution fan 6, a negative pressure is generated inside the air inlet box 1. Outside air enters from the air inlet 14 and comes into contact with the water curtain. The water curtain can reduce the temperature of the air, keeping the air entering the descending flue 3 at a low temperature. The filter screen 10 can block external impurities and dust. The filter screen 10 can be cleaned by opening the side door 12 periodically.

[0030] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A device for regulating the air volume of a dilution fan, comprising an air inlet box (1), characterized in that, A suction pipe (8) is installed on one side of the upper end of the air inlet box (1). One side of the suction pipe (8) is connected to the suction end of the dilution fan (6). An air inlet (14) is provided on one side of the air inlet box (1). An air outlet pipe (5) is connected to the air outlet end of the dilution fan (6). One end of the air outlet pipe (5) is connected to a solenoid valve (7). One end of the solenoid valve (7) is connected to the inlet end of the descending flue (3) through a pipe (4). A water curtain cooling component is provided on one side of the air inlet box (1) located at the air inlet (14). A controller (16) is installed on the top of the air inlet box (1).

2. A flow regulating device for dilution air fan according to claim 1, wherein, The water curtain cooling component includes a water pipe (13) fixed to the top of the inner wall of the air inlet box (1), and spray nozzles (15) are installed at equal intervals on the water pipe (13). One end of the water pipe (13) extends to the outside of the air inlet box (1) and is connected to a water supply valve (9). One end of the water supply valve (9) is connected to a water supply device.

3. A damper assembly for use in a dilution air fan according to claim 1, wherein, A temperature sensor (2) is located on the descending flue (3) near the inlet end, and the detection head of the temperature sensor (2) is located inside the descending flue (3).

4. A damper assembly for use in a dilution air fan according to claim 3, wherein, The drive motors of the temperature sensor (2), solenoid valve (7) and dilution fan (6) are all electrically connected to the controller (16).

5. A damper assembly for use in a dilution air fan according to claim 2, wherein, The inner wall of the air inlet box (1) is equipped with a filter screen (10).

6. A flow regulating device for a dilution air fan as defined in claim 5, wherein The water pipe (13) is located between the filter screen (10) and the air inlet (14).

7. The air volume control device for dilution air fan of claim 1, wherein, The bottom of one side of the air inlet box (1) is connected to a drain pipe (11), which is connected to a water resource recycling device.

8. A damper assembly for use in a dilution air fan according to claim 7, wherein, A side door (12) is provided on the other side of the air inlet box (1).

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