Double-speed jet flow fan

Abstract

The utility model discloses a double-speed jet flow fan which comprises a fan base, silencing cylinders are connected to the two ends of the fan base, a fairing is arranged in the fan base and fixedly connected with the inner wall of the fan base through a plurality of hollow pipes, a double-speed motor is fixedly connected into the fairing, and an impeller is fixedly connected to the driving shaft end of the double-speed motor. According to the utility model, a power frequency motor in the fan is replaced by the double-speed motor, and a half-power operation mode is adopted, so that the daily ventilation is met, and the energy consumption can be reduced.

Description

Technical Field

[0001] This utility model relates to jet fans, and more specifically, to a dual-speed jet fan. Background Technology

[0002] The jet fans in the tunnel are used for daily ventilation. A set of jet fans is installed at intervals in the tunnel, and multiple sets of jet fans are usually installed in the tunnel. The motors in the current jet fans are industrial frequency motors, which can only be fully open or fully closed. In daily use, they are mostly switched on in sections, that is, one set is on and the other is off, so as to meet the daily ventilation needs and reduce energy consumption. However, due to the long distance between the two sets of fully open fan sets, the overall airflow in the tunnel is still insufficient, so there is an urgent need to improve this. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a dual-speed jet fan. By replacing the industrial frequency motor in the fan with a dual-speed motor and operating at half power, it can meet the needs of daily ventilation while reducing energy consumption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a dual-speed jet fan, including a fan base, with silencers connected to both ends of the fan base, a rectifier shroud inside the fan base, the rectifier shroud being fixedly connected to the inner wall of the fan base through multiple hollow tubes, a dual-speed motor being fixedly connected inside the rectifier shroud, and an impeller being fixedly connected to the drive shaft end of the dual-speed motor.

[0005] Furthermore, the silencer is bolted to the fan base, and a sound-absorbing cover is provided inside the silencer. Sound-absorbing cotton is filled between the sound-absorbing cover and the inner wall of the silencer. The two ends of the sound-absorbing cover are fixedly connected to the silencer through flange rings.

[0006] Furthermore, the side wall of the fairing is provided with a second through hole corresponding to the hollow tube, the hollow tube is provided with a hollow channel inside, and the side of the hollow tube facing the impeller is provided with a third through hole, the third through hole is connected to the hollow channel, and the hollow channel is connected to the inside of the fairing through the second through hole.

[0007] Furthermore, the side wall of the fan base is provided with a first through hole, which is connected to the hollow channel.

[0008] Furthermore, the shroud is covered with a first cover on the side facing the impeller. The first cover has a plurality of fourth through holes that connect to the interior of the shroud. The outer contour of the side of the shroud away from the impeller is hemispherical and an opening is provided in the middle of the hemisphere. The third through hole, the hollow channel, the second through hole, the interior of the shroud, and the opening form a first airflow channel. The opening, the interior of the shroud, and the fourth through hole form a second airflow channel.

[0009] Furthermore, the fairing is provided with a clearance cavity, and the inner wall of the fairing is provided with an annular rib on the outer periphery of the opening. The annular rib is located in the clearance cavity, and a mounting cavity is formed in the annular rib. A movable stop is installed in the mounting cavity. The movable stop includes a baffle. The movable stop is movable so that the baffle can be located in the mounting cavity, in the opening, or outside the fairing.

[0010] Furthermore, when the shield is located inside the opening, the sidewall of the shield is in clearance fit with the inner wall of the opening, and the outer contour of the shield is consistent with the hemispherical outer contour of the fairing.

[0011] Furthermore, a second cover is fixedly connected to the end of the annular rib, and a guide platform is provided in the middle of the second cover. Multiple fifth through holes are provided around the guide platform. The clearance cavity, the fifth through holes and the mounting cavity are connected. A guide rod is provided on the side of the cover facing the clearance cavity. The guide rod passes through the guide platform and is inserted into the clearance cavity.

[0012] Furthermore, one end of the guide rod inserted into the clearance cavity is provided with a boss, and a first spring and a second spring are respectively sleeved on the outside of the guide rod. The first spring is located in the mounting cavity, with one end of the first spring abutting against the inside of the cover and the other end abutting against the side of the second cover facing the mounting cavity. The second spring is located in the clearance cavity, with one end of the second spring abutting against the side of the boss and the other end abutting against the side of the second cover facing the clearance cavity.

[0013] Furthermore, the inner wall of the rectifier is provided with multiple limiting ribs, the dual-speed motor is located in the area surrounded by the multiple limiting ribs, the number of hollow tubes is six and they are evenly distributed along the axis of the fan base, the hollow tubes are welded and fixed to the inner wall of the fan base, and the hollow tubes, rectifier and dual-speed motor are fixed by bolts.

[0014] In summary, this utility model has the following beneficial effects:

[0015] By replacing the existing power frequency motors with dual-speed motors, each fan unit's dual-speed motor operates at half power during daily ventilation, which ensures that each fan unit can provide ventilation, reduces energy consumption, and effectively improves the ventilation effect inside the tunnel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0017] Figure 2 for Figure 1 Enlarged view at point A;

[0018] Figure 3 for Figure 1 A partial schematic diagram.

[0019] Reference numerals: 1. Fan base; 11. First through hole; 2. Silencer; 21. Silencer cover; 22. Silencing cotton; 23. Flange ring; 3. Dual-speed motor; 31. Impeller; 4. Radiator; 41. Limiting rib; 42. Clearance cavity; 43. Annular rib; 44. Opening; 45. Mounting cavity; 46. Second through hole; 5. Hollow tube; 51. Hollow channel; 52. Third through hole; 6. First cover; 61. Fourth through hole; 7. Second cover; 71. Fifth through hole; 72. Guide platform; 8. Movable stop; 81. Baffle; 82. Guide rod; 83. Boss; 9. First spring; 100. Second spring. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 3 As shown in the figure, this embodiment discloses a dual-speed jet fan, including a fan base 1. Silencing cylinders 2 are connected to both ends of the fan base 1. The silencers 2 are bolted to the fan base 1. A sound-absorbing cover 21 is provided inside the silencers 2. Sound-absorbing cotton 22 is filled between the sound-absorbing cover 21 and the inner wall of the silencers 2. The two ends of the sound-absorbing cover 21 are fixedly connected to the silencers 2 via flange rings 23. The sound-absorbing cotton 22 is fire-resistant quartz wool, and the sound-absorbing cover 21 is a porous sleeve. By setting the silencers 2 at both ends of the fan base 1, the fan base 1 can play a role in flame retardancy and noise reduction, thereby reducing tunnel noise.

[0022] The fan base 1 is equipped with a rectifier 4 inside. The rectifier 4 is fixedly connected to the inner wall of the fan base 1 through multiple hollow tubes 5. A dual-speed motor 3 is fixedly connected inside the rectifier 4. An impeller 31 is fixedly connected to the drive shaft end of the dual-speed motor 3. The dual-speed motor 3 is a motor with two power and speed, namely, full power speed and half power speed. This motor is existing technology, and its specific structure and principle will not be described in detail in this specification. By replacing the existing industrial frequency motor with the dual-speed motor 3, the dual-speed motor 3 of each fan unit operates at half power during daily ventilation, which can ensure that each fan unit can ventilate, reduce energy consumption, and effectively improve the ventilation effect in the tunnel.

[0023] The inner wall of the rectifier 4 is provided with multiple limiting ribs 41. The dual-speed motor 3 is located in the area enclosed by the multiple limiting ribs 41. There are six hollow tubes 5, which are evenly distributed along the axis of the fan base 1. The hollow tubes 5 are welded and fixed to the inner wall of the fan base 1. The hollow tubes 5, the rectifier 4 and the dual-speed motor 3 are fixed by bolts. Through the above settings, the dual-speed motor 3, the rectifier 4, the hollow tubes 5 and the fan base 1 can be fixed. The fixing method is simple, convenient and reliable.

[0024] The sidewall of the shroud 4 is provided with a second through hole 46 corresponding to the hollow tube 5. The hollow tube 5 is provided with a hollow channel 51 inside. The side of the hollow tube 5 facing the impeller 31 is provided with a third through hole 52. The third through hole 52 is connected to the hollow channel 51. The hollow channel 51 is connected to the inside of the shroud 4 through the second through hole 46. The outer contour of the side of the shroud 4 away from the impeller 31 is hemispherical and an opening 44 is provided in the middle of the hemisphere. The third through hole 52, the hollow channel 51, the second through hole 46, the inside of the shroud 4, and the opening 44 form a first airflow channel. The side of the shroud 4 facing the impeller 31 is covered with a first cover 6. The first cover 6 is provided with a plurality of fourth through holes 61 that connect to the inside of the shroud 4. The opening 44, the inside of the shroud 4, and the fourth through holes 61 form a second airflow channel.

[0025] like Figure 1 As shown, when the impeller 31 rotates clockwise, the airflow direction inside the fan base 1 is from left to right. At this time, a small portion of the airflow, when passing through the inside of the fan base 1, will enter the hollow tube 5 through the third through hole 52, and then enter the rectifier 4 along the hollow channel 51 and the second through hole 46 to contact the dual-speed motor 3, thereby cooling the dual-speed motor 3. After passing through the dual-speed motor, the airflow will flow out from the opening 44. When the impeller 32 rotates counterclockwise, the airflow direction inside the fan base 1 is from right to left. At this time, most of the airflow flows towards the impeller 31 along the hemispherical contour of the rectifier 4. A small portion of the airflow enters the rectifier 4 after passing through the opening 44 and contacts the dual-speed motor 3, thereby cooling the dual-speed motor 3. After passing through the dual-speed motor 3, the airflow will flow out from the fourth through hole 61. With the above design, while protecting the dual-speed motor 3 through the rectifier 4, the heat dissipation effect of the dual-speed motor 3 can be ensured, avoiding the impact on the service life of the dual-speed motor 3 due to the setting of the rectifier 4.

[0026] like Figure 2As shown, the fairing 4 has a clearance cavity 42 inside. An annular rib 43 is provided on the inner wall of the fairing 4 around the opening 44. The annular rib 43 is located within the clearance cavity 42, forming a mounting cavity 45. A movable stop 8 is installed within the mounting cavity 45. The movable stop 8 includes a baffle 81, which is movable to allow the baffle 81 to be located within the mounting cavity 45, within the opening 44, or outside the fairing 4. Specifically, a second cover 7 is fixedly connected to the end of the annular rib 43. A guide platform 72 is provided in the middle of the second cover 7. Multiple fifth through holes 71 are provided around the guide platform 72. The clearance cavity 42 and the fifth through holes 71... The hole 71 is connected to the mounting cavity 45. The cover 81 is provided with a guide rod 82 on the side facing the relief cavity 42. The guide rod 82 passes through the guide platform 72 and is inserted into the relief cavity 42. One end of the guide rod 82 inserted into the relief cavity 42 is provided with a boss 83. A first spring 9 and a second spring 100 are respectively sleeved on the outside of the guide rod 82. The first spring 9 is located in the mounting cavity 45. One end of the first spring 9 abuts against the inside of the cover 81 and the other end abuts against the side of the second cover 7 facing the mounting cavity 45. The second spring 100 is located in the relief cavity 42. One end of the second spring 100 abuts against the side of the boss 83 and the other end abuts against the side of the second cover 7 facing the relief cavity 42.

[0027] With the above design, when the dual-speed motor 3 is not working or is started at half power, the baffle 81 is located inside the opening 44. At this time, the baffle 81 can block larger flying insects and some dust from entering the fairing 4. The side wall of the baffle 81 is fitted with the inner wall of the opening 44 with a clearance, and the outer contour of the baffle 81 is consistent with the hemispherical outer contour of the fairing 4.

[0028] When the dual-speed motor 3 rotates forward and starts at half power, the airflow entering the shroud 4 is small and cannot push the movable baffle 8. At this time, the airflow flows out from the gap between the baffle 81 and the opening 44 after passing through the dual-speed motor 3. When the dual-speed motor 3 rotates forward and starts at full power, the dual-speed motor 3 needs better heat dissipation. At this time, the airflow entering the shroud 4 is large, and the airflow pushes the movable baffle 8 to move. The second spring 100 is compressed, causing the baffle 81 to move to the right and beyond the shroud 4. The gap between the baffle 81 and the opening 44 becomes larger, thus facilitating the passage of airflow. When the dual-speed motor 3 reverses and starts at half power, the airflow cannot push the movable baffle 8 to the left. At this time, most of the airflow can diffuse outward along the outer contour of the baffle 81, while a small portion of the airflow flows into the rectifier 4 through the gap between the baffle 81 and the opening 44 to cool the dual-speed motor 3. When the dual-speed motor 3 reverses and starts at full power, the airflow can push the baffle 81 toward the mounting cavity 45 and compress the first spring 9. At this time, the gap between the baffle 81 and the opening 44 becomes larger, allowing more airflow to enter the rectifier 4 to cool the dual-speed motor 3.

[0029] The fan base 1 has a first through hole 11 on its side wall. The first through hole 11 is connected to the hollow channel 51. There is one first through hole 11 and it is directly opposite one of the hollow channels 51. The first through hole 11 is used for the wire harness of the dual-speed motor 3 to pass through.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A dual-speed jet fan, characterized in that, Includes a fan base (1), with silencers (2) connected to both ends of the fan base (1), and a rectifier (4) provided inside the fan base (1). The rectifier (4) is fixedly connected to the inner wall of the fan base (1) through multiple hollow tubes (5). A dual-speed motor (3) is fixedly connected inside the rectifier (4), and an impeller (31) is fixedly connected to the drive shaft end of the dual-speed motor (3).

2. The dual-speed jet fan according to claim 1, characterized in that, The silencer (2) is connected to the fan base (1) by bolts. The silencer (2) is provided with a soundproof cover (21). The soundproof cover (21) and the inner wall of the silencer (2) are filled with soundproof cotton (22). The two ends of the soundproof cover (21) are fixedly connected to the silencer (2) by flange rings (23).

3. A dual-speed jet fan according to claim 1, characterized in that, The side wall of the shroud (4) is provided with a second through hole (46) corresponding to the hollow tube (5). The hollow tube (5) is provided with a hollow channel (51) inside. The side of the hollow tube (5) facing the impeller (31) is provided with a third through hole (52). The third through hole (52) is connected to the hollow channel (51). The hollow channel (51) is connected to the inside of the shroud (4) through the second through hole (46).

4. A dual-speed jet fan according to claim 3, characterized in that, The fan base (1) has a first through hole (11) on its side wall, and the first through hole (11) is connected to the hollow channel (51).

5. A dual-speed jet fan according to claim 3, characterized in that, The shroud (4) is covered with a first cover (6) on the side facing the impeller (31). The first cover (6) has a plurality of fourth through holes (61) that connect to the interior of the shroud (4). The outer contour of the side of the shroud (4) away from the impeller (31) is hemispherical and an opening (44) is provided in the middle of the hemisphere. The third through hole (52), the hollow channel (51), the second through hole (46), the interior of the shroud (4) and the opening (44) form a first airflow channel. The opening (44), the interior of the shroud (4) and the fourth through hole (61) form a second airflow channel.

6. A dual-speed jet fan according to claim 5, characterized in that, The fairing (4) is provided with a clearance cavity (42). The inner wall of the fairing (4) is provided with an annular rib (43) on the outer periphery of the opening (44). The annular rib (43) is located in the clearance cavity (42). The annular rib (43) forms a mounting cavity (45). A movable stop (8) is installed in the mounting cavity (45). The movable stop (8) includes a cover (81). The movable stop (8) is movable so that the cover (81) can be located in the mounting cavity (45), in the opening (44), or outside the fairing (4).

7. A dual-speed jet fan according to claim 6, characterized in that, When the shield (81) is located inside the opening (44), the side wall of the shield (81) is in clearance fit with the inner wall of the opening (44) and the outer contour of the shield (81) is consistent with the hemispherical outer contour of the fairing (4).

8. A dual-speed jet fan according to claim 7, characterized in that, The end of the annular rib (43) is fixedly connected to a second cover (7). The second cover (7) has a guide platform (72) in the middle. The guide platform (72) has multiple fifth through holes (71) around its periphery. The clearance cavity (42), the fifth through holes (71) and the mounting cavity (45) are connected. The baffle (81) has a guide rod (82) on the side facing the clearance cavity (42). The guide rod (82) passes through the guide platform (72) and is inserted into the clearance cavity (42).

9. A dual-speed jet fan according to claim 8, characterized in that, The guide rod (82) has a boss (83) at one end inserted into the clearance cavity (42). A first spring (9) and a second spring (100) are respectively sleeved on the outside of the guide rod (82). The first spring (9) is located in the mounting cavity (45). One end of the first spring (9) abuts against the inside of the cover (81) and the other end abuts against the side of the second cover (7) facing the mounting cavity (45). The second spring (100) is located in the clearance cavity (42). One end of the second spring (100) abuts against the side of the boss (83) and the other end abuts against the side of the second cover (7) facing the clearance cavity (42).

10. A dual-speed jet fan according to claim 1, characterized in that, The inner wall of the rectifier (4) is provided with multiple limiting ribs (41). The dual-speed motor (3) is located in the area enclosed by the multiple limiting ribs (41). There are six hollow tubes (5) and they are evenly distributed along the axis of the fan base (1). The hollow tubes (5) are welded and fixed to the inner wall of the fan base (1). The hollow tubes (5), the rectifier (4) and the dual-speed motor (3) are fixed by bolts.

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