Tunnel fan air volume adjusting device

Abstract

This utility model discloses a tunnel ventilation fan airflow adjustment device, relating to the field of tunnel ventilation technology. It includes a connecting seat and a fan cover. Two fan covers are provided, one on each side of the connecting seat. The connecting seat has a ring structure, and multiple through slots are formed at the bottom of its inner sidewall. Multiple extension pipes are fixed at the openings of these slots. This utility model, by setting up the connecting seat, fan cover, through slots, extension pipes, and guide plate, forms a series-connected axial flow fan structure. This series combination improves the device's airflow guidance effect within the tunnel. By adjusting the angle of the guide plate, the inner diameter of the internal channel of the connecting seat is adjusted. At this time, the connecting seat and fan cover form a Venturi tube structure. The connecting seat with the smaller inner diameter acts as the throat of the Venturi tube. When air flows through the connecting seat, the air velocity increases under the Venturi effect, thereby achieving airflow adjustment without adjusting the drive motor speed.

Description

Technical Field

[0001] This utility model relates to the field of tunnel ventilation technology, and in particular to a tunnel ventilation air volume regulating device. Background Technology

[0002] A jet fan is a special type of axial flow fan, primarily used in the longitudinal ventilation systems of tunnels in highways, railways, and subways to provide all the thrust. It can also be used in semi-lateral ventilation systems or sensitive parts of lateral ventilation systems, such as tunnel inlets and outlets, to induce airflow or exhaust smoke. Jet fans are typically suspended from the tunnel ceiling, occupying no building space and requiring no additional ductwork. They are characterized by high efficiency, low noise, stable operation, and easy maintenance.

[0003] Existing tunnel ventilation fans have a relatively simple structure. When ventilating long tunnels, multiple tunnel ventilation fans need to be connected in series to increase airflow in order to ensure ventilation effect. However, while connecting multiple tunnel ventilation fans in series can increase airflow, it is difficult to adjust the air volume. Although existing technologies use adjustable speed DC motors as power sources to adjust the fan air volume, the cost of using adjustable speed DC motors is high. Furthermore, existing tunnel ventilation fans can only guide the air inside the tunnel axially, and the air guidance effect on the area below and outside the tunnel ventilation fan is poor.

[0004] Therefore, it is necessary to invent a tunnel ventilation fan air volume regulating device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a tunnel ventilation fan air volume regulating device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a tunnel ventilation fan air volume adjustment device, including a connecting seat and a fan cover. Two fan covers are provided and respectively located on both sides of the connecting seat. The connecting seat is designed as a ring structure, and multiple through slots are opened at the bottom of the inner side wall of the connecting seat. Multiple extension tubes are fixedly provided at the openings of the multiple through slots, and the multiple extension tubes are fixedly located on the outside of the connecting seat. An air inlet cover is fixedly provided at one end of each of the multiple extension tubes. Guide plates are rotatably provided at the openings of the multiple through slots via pins. The multiple guide plates are designed as arc structures and are located inside the connecting seat. Electric telescopic rods are fixedly provided on the inner side walls of the multiple through slots. Connecting arms are rotatably provided at the output ends of the multiple electric telescopic rods via pins, and the top ends of the multiple connecting arms are movably connected to one end of the lower surface of the multiple guide plates via pins.

[0007] The inner wall of the connecting seat is provided with multiple baffles that can be rotatably mounted on a pin. Each baffle is designed with an arc shape and is staggered with multiple guide plates. A tension spring is fixedly mounted on the lower surface of each baffle away from the pin, and the bottom end of the tension spring is connected to the inner wall of the connecting seat.

[0008] Preferably, extension plates are fixedly provided on both sides of the lower surface of the guide plate, and both ends of the extension plates are designed with arc-shaped structures.

[0009] Preferably, the air intake hood is configured as a horn-shaped structure, and a dustproof plate is fixed to the bottom end of the air intake hood by bolts.

[0010] Preferably, a motor bracket is fixedly installed inside the fan cover, a drive motor is fixedly installed in the middle of the motor bracket, and fan blades are fixedly installed on the output shaft of the drive motor.

[0011] Preferably, a mounting base is provided above the connecting base, and a connecting frame is fixedly provided between the mounting base and the connecting base.

[0012] Preferably, the mounting base has mounting holes at all four corners of its upper surface, and the mounting holes are designed as strip-shaped structures.

[0013] Preferably, both ends of the connecting seat and the fan cover are fixedly provided with connecting flanges, and two adjacent connecting flanges are connected by bolts.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. This utility model, by setting up a connecting seat, a fan cover, a through groove, an extension pipe, and a guide plate, forms a series axial flow fan structure with the connecting seat and the fan cover. The series combination improves the device's air guiding effect in the tunnel. By adjusting the angle of the guide plate, the inner diameter of the channel inside the connecting seat is adjusted. At this time, the connecting seat and the fan cover form a Venturi structure. The connecting seat with the smaller inner diameter serves as the throat part of the Venturi. When the air flows through the connecting seat, the air velocity increases under the Venturi effect, thereby achieving the adjustment of the device's air volume without adjusting the speed of the drive motor. This allows the device to complete the air volume regulation and control even when using a low-cost AC motor, reducing the cost of the device.

[0016] 2. This utility model, by setting up a through groove, an extension pipe, an air inlet hood, and a guide plate, allows the connecting seat and the fan hood to form a Venturi structure when the guide plate flips upward during use. At this time, the extension pipe and the air inlet hood form a secondary pipe structure of the Venturi. When the air flows through the inside of the connecting seat, the flow velocity increases. At this time, the air outside the air inlet hood is drawn into the connecting seat under the negative pressure, so as to realize the extraction and guidance of air below and on the side of the device, thereby improving the range of air guidance inside the tunnel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional schematic diagram of the overall structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the connector of this utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the through groove of this utility model.

[0021] In the diagram: 1. Connecting seat; 2. Fan cover; 3. Through slot; 4. Extension pipe; 5. Air inlet cover; 6. Guide plate; 7. Electric telescopic rod; 8. Connecting arm; 9. Baffle; 10. Tension spring; 11. Extension plate; 12. Dustproof plate; 13. Drive motor; 14. Motor bracket; 15. Fan blade; 16. Mounting seat; 17. Connecting frame. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides, for example Figure 1-4 The tunnel ventilation fan air volume adjustment device shown includes a connecting seat 1 and a fan cover 2. Two fan covers 2 are provided and are respectively located on both sides of the connecting seat 1. The connecting seat 1 is designed as a ring structure, and multiple through slots 3 are opened at the bottom of the inner side wall of the connecting seat 1. Multiple extension pipes 4 are fixed at the slot openings of the multiple through slots 3, and the multiple extension pipes 4 are fixed at the outer side of the connecting seat 1. An air inlet cover 5 is fixed at one end of each of the multiple extension pipes 4. A guide plate 6 is rotatably provided at the slot openings of the multiple through slots 3 through a pin. The multiple guide plates 6 are designed as arc structures and are located inside the connecting seat 1. An electric telescopic rod 7 is fixed at the inner side wall of each of the multiple through slots 3. A connecting arm 8 is rotatably provided at the output end of each of the multiple electric telescopic rods 7 through a pin. The top ends of the multiple connecting arms 8 are movably connected to one end of the lower surface of each of the multiple guide plates 6 through pins. It should be noted that the electric telescopic rod 7 adopts the corresponding structure in the prior art, and is equipped with a power supply and a controller to ensure that it can drive the connecting arm 8 to move up and down.

[0024] The inner wall of the connecting seat 1 is rotatably provided with multiple baffles 9 via pins. Each baffle 9 is an arc-shaped structure and is staggered with multiple guide plates 6. A tension spring 10 is fixedly provided at the lower surface of each baffle 9 away from the pin, and the bottom end of the tension spring 10 is connected to the inner wall of the connecting seat 1. The tension spring 10 is used to reset the baffle 9. It should be noted that, considering that the baffle 9 is in contact with the inner wall of the connecting seat 1 after being reset, the tension spring 10 may affect the contact between the baffle 9 and the connecting seat 1. When installing the tension spring 10, a corresponding groove can be opened on the lower surface of the baffle 9 and the inner wall of the connecting seat 1 to accommodate the tension spring 10. This method is a common technical method in the field and will not be described in detail here.

[0025] Both sides of the lower surface of the guide plate 6 are fixed with extension plates 11, and both ends of the extension plates 11 are set with arc-shaped structures. The extension plates 11 are used to block the space on both sides of the guide plate 6 after it is flipped upward.

[0026] The air intake hood 5 is designed with a trumpet-shaped structure, and the bottom end of the air intake hood 5 is fixed with a dustproof plate 12 by bolts. The dustproof plate 12 is used to prevent dust and debris from entering the device.

[0027] A motor bracket 14 is fixedly installed inside the fan cover 2. A drive motor 13 is fixedly installed in the middle of the motor bracket 14. A fan blade 15 is fixedly installed on the output shaft of the drive motor 13. The drive motor 13 and the fan blade 15 form the power mechanism of the axial flow fan. It adopts the corresponding structure in the prior art. The drive motor 13 is equipped with a corresponding power supply and control switch to ensure normal operation.

[0028] A mounting base 16 is provided above the connecting base 1, and a connecting bracket 17 is fixed between the mounting base 16 and the connecting base 1. Mounting holes are provided through the four corners of the upper surface of the mounting base 16, and the mounting holes are designed as strip structures. Connecting flanges are fixed at both ends of the connecting base 1 and the fan cover 2, and adjacent connecting flanges are connected by bolts. It should be noted that the connection method of connecting flanges and bolts adopts existing technology, which will not be described in detail here.

[0029] Working principle of this utility model:

[0030] When this device is in use, the connecting seat 1 is fixed to the top of the tunnel via the mounting seat 16 and expansion bolts. The fan cover 2 is installed on the outside of the connecting seat 1 via bolts and connecting flanges. The fan cover 2 and the connecting seat 1 form a series structure. When ventilating the inside of the tunnel, the drive motor 13 inside the fan cover 2 drives the fan blades 15 to rotate. The fan blades 15 shear the air, causing the air in the channel formed by the connecting seat 1 and the fan cover 2 to flow. The air in the channel then drives the air in the tunnel to flow, thereby achieving ventilation inside the tunnel.

[0031] When the air volume of the device needs to be adjusted, the electric telescopic rod 7 is extended outward by controlling the electric telescopic rod 7 to drive the bottom end of the connecting arm 8 to move upward. The connecting arm 8 drives one end of the guide plate 6 to move upward, so that the guide plate 6 rotates around the pin shaft. After the guide plate 6 rotates, it separates from the through groove 3. During the rotation of the guide plate 6, the baffle 9 is pushed upward, so that the guide plate 6 and the baffle 9 form the guide plate structure inside the connecting seat 1. After the guide plate 6 and the baffle 9 are flipped upward, the internal area of ​​the connecting seat 1 is reduced. At this time, the connecting seat 1 and the fan cover 2 form a venturi structure, and the connecting seat 1 is the throat part of the venturi structure. When the air flows through the connecting seat 1, the flow velocity increases under the venturi effect, thereby achieving the effect of increasing the air volume of the device.

[0032] Furthermore, when the guide plate 6 rotates upward and separates from the through groove 3, the channel between the extension tube 4 and the connecting seat 1 is opened. At this time, the extension tube 4 and the air inlet hood 5 form a venturi secondary tube structure. As the air velocity increases when it flows through the connecting seat 1, the pressure at the slot opening of the through groove 3 on the inside side of the connecting seat 1 increases. At this time, the air at the bottom of the air inlet hood 5 is drawn into the interior of the connecting seat 1 under the action of negative pressure, so as to guide the air below and outside of the device, thereby increasing the air volume of the device and increasing the air guidance range.

[0033] It should be noted that the connecting seat 1 and the fan cover 2 in this embodiment can be set as multiple sets. This embodiment and the accompanying drawings only provide a schematic diagram of the composition of one set of connecting seat 1 and two sets of fan covers 2. In practical applications, the number of connecting seats 1 and fan covers 2 can be increased according to the requirements.

[0034] It should be further explained that the method of increasing the air volume of the device by changing the direction of the guide plate 6 to change the internal channel area of ​​the connecting seat 1 in this embodiment can be applied not only to axial flow fans whose power source is a non-speed-adjustable drive motor 13, but also to axial flow fans whose power source is a speed-adjustable motor. The technical solution in this embodiment can still achieve this effect.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tunnel ventilation fan air volume regulating device, comprising a connecting seat (1) and a fan cover (2), characterized in that: The fan cover (2) is provided in two and is respectively provided on both sides of the connecting seat (1). The connecting seat (1) is provided in a ring structure. Multiple through slots (3) are provided at the bottom of the inner side wall of the connecting seat (1). Multiple extension tubes (4) are fixed at the slot openings of the multiple through slots (3). The multiple extension tubes (4) are fixed at the outer side of the connecting seat (1). An air inlet cover (5) is fixed at one end of the multiple extension tubes (4). A guide plate (6) is rotatably provided at the slot openings of the multiple through slots (3) through a pin. The multiple guide plates (6) are provided in an arc structure. The multiple guide plates (6) are located inside the connecting seat (1). An electric telescopic rod (7) is fixedly provided on the inner side wall of the multiple through slots (3). A connecting arm (8) is rotatably provided at the output end of the multiple electric telescopic rods (7) through a pin. The top ends of the multiple connecting arms (8) are movably connected to one end of the lower surface of the multiple guide plates (6) through pins. The inner sidewall of the connecting seat (1) is provided with multiple baffles (9) that can be rotatably provided by a pin. The multiple baffles (9) are all designed with an arc shape, and the multiple baffles (9) are respectively staggered with multiple guide plates (6). The lower surface of the multiple baffles (9) away from the pin is fixedly provided with a tension spring (10), and the bottom end of the tension spring (10) is connected to the inner sidewall of the connecting seat (1).

2. The tunnel ventilation fan air volume regulating device according to claim 1, characterized in that: The guide plate (6) has extension plates (11) fixed on both sides of its lower surface, and both ends of the extension plates (11) are arc-shaped.

3. The tunnel ventilation fan air volume regulating device according to claim 1, characterized in that: The air intake hood (5) is designed with a horn-shaped structure, and a dustproof plate (12) is fixed to the bottom of the air intake hood (5) by bolts.

4. The tunnel ventilation fan air volume regulating device according to claim 1, characterized in that: The fan cover (2) is fixedly provided with a motor bracket (14), and a drive motor (13) is fixedly provided in the middle of the motor bracket (14). The output shaft of the drive motor (13) is fixedly provided with fan blades (15).

5. The tunnel ventilation fan air volume regulating device according to claim 1, characterized in that: A mounting base (16) is provided above the connecting seat (1), and a connecting frame (17) is fixedly provided between the mounting base (16) and the connecting seat (1).

6. The tunnel ventilation fan air volume regulating device according to claim 5, characterized in that: The mounting base (16) has mounting holes at the four corners of its upper surface, and the mounting holes are designed as strip-shaped structures.

7. The tunnel ventilation fan air volume regulating device according to claim 1, characterized in that: Both ends of the connecting seat (1) and the fan cover (2) are fixed with connecting flanges, and two adjacent connecting flanges are connected by bolts.

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