Dry-change cross-flow cooling fan

Abstract

The invention relates to the technical field of cross flow fans, in particular to a dry-type transformer cross flow cooling fan. Comprising a lower shell, an upper shell is arranged at the top of the lower shell, a transverse flow impeller is rotationally installed between the lower shell and the upper shell, air inlets are formed in the front ends of the lower shell and the upper shell, transverse plates are welded to the rear ends of the lower shell and the upper shell, and the two transverse plates are distributed up and down to form an air outlet; an intercepting plate is fixedly connected to the bottom of the inner wall of the upper shell, an air channel is formed in the upper shell, and when airflow passes through the air outlet, part of airflow at the air outlet is intercepted by the intercepting plate, enters the air channel and is exhausted upwards to form an air curtain. By means of the intercepting plate and the air channel, part of air outlet airflow is intercepted to form an air curtain to block hot air backflow, air outlet is concentrated in cooperation with the guide plate of the lower shell, the cooling effect is enhanced, meanwhile, the air inlet opening is increased by means of the adjusting assembly, the air inlet amount is increased, and therefore the problems of hot air circulating suction and low cooling efficiency in the background technology are solved.

Description

Technical Field

[0001] This invention relates to the field of crossflow fan technology, and more specifically, to a dry-type crossflow cooling fan. Background Technology

[0002] Dry-type transformers are important power distribution equipment in power systems. Because they generate heat during operation, they need to be equipped with cross-flow cooling fans to cool them down. When the cross-flow cooling fans are working, they first draw in outside air, and after centrifugal compression, blow it from the bottom to the dry-type transformer and flow upward to carry away the heat from the transformer.

[0003] Because the air inlet of the crossflow cooling fan is located above the air outlet, the negative pressure generated at the upper air inlet will capture this part of the air carrying heat again, compress it again and blow it towards the transformer, which reduces the cooling efficiency, makes it difficult to effectively control the transformer temperature, and affects the stable operation of the dry-type transformer. Summary of the Invention

[0004] This invention provides a dry-type cross-flow cooling fan, which uses a baffle plate and air duct to intercept part of the outflow to form an air curtain to block the backflow of hot air. Combined with a guide plate to concentrate the airflow and enhance the cooling effect, the air inlet opening is increased by adjusting the component to increase the air intake volume, thereby solving the problems of hot air circulation and low cooling efficiency mentioned in the background art.

[0005] To achieve the above objectives, the dry-type cross-flow cooling fan includes a lower housing, an upper housing at the top of the lower housing, a cross-flow impeller rotatably mounted between the lower housing and the upper housing, an air inlet at the front end of the lower housing and the upper housing, and a transverse plate welded to the rear end of the lower housing and the upper housing, with the two transverse plates arranged vertically to form an air outlet. A baffle plate is fixedly connected to the bottom of the inner wall of the upper shell. An air passage is opened inside the upper shell. When the airflow passes through the air outlet, the baffle plate intercepts part of the airflow from the air outlet and enters the air passage and is discharged upward to form an air curtain.

[0006] Multiple guide plates are welded to the top of the horizontal plate of the lower housing. The guide plates converge from the side near the lower housing toward the air outlet and toward the center, so that the airflow blown out from the air outlet is concentrated in the center.

[0007] In the above technical solution, the air curtain is formed by the combination of the baffle plate and the air duct to solve the problem of hot air circulation and intake. The air is concentrated by the baffle plate to improve cooling efficiency. The two work together to optimize the airflow path, ensuring that the cooling air effectively acts on the transformer, while blocking heat backflow and continuously providing cold air to the fan.

[0008] Based on the above, an adjustment assembly is installed inside the lower and upper housings. The adjustment assembly includes an arc-shaped baffle that is slidably installed inside the lower and upper housings. A rotating shaft is rotatably installed inside both the lower and upper housings. Multiple gears are fixedly connected to the outer wall of the rotating shaft. Multiple sets of tooth grooves are formed on the outer wall of the arc-shaped baffle. The gears mesh with the tooth grooves. During the adjustment phase, the rotation of the rotating shaft causes the arc-shaped baffle to retract into the inner cavity of the lower and upper housings through the engagement of the gears and tooth grooves, thereby increasing the opening of the air inlet.

[0009] A stepper motor is fixedly installed on the outer wall of the left side plate. A synchronous wheel one is fixedly installed on the left end of the rotating shaft inside the upper housing. A synchronous wheel two is rotatably installed on the outer wall of the left side plate. A synchronous belt is sleeved on the outer wall of the synchronous wheel one and the synchronous wheel two.

[0010] Gear 2 is fixedly connected to the right side of the synchronous pulley 2, and gear 3 is fixedly connected to the left end of the rotating shaft inside the lower housing. Gear 2 and gear 3 mesh with each other.

[0011] In the above technical solution, the upper and lower arc-shaped baffles are moved synchronously by a stepper motor driving gears and synchronous wheel transmission, which flexibly adjusts the size of the air inlet opening. When the temperature is too high, the air volume is increased to enhance the cooling effect, and when the temperature is normal, the opening is reduced to reduce energy consumption. This adapts to the heat dissipation requirements of transformers under different loads and improves the adaptability of the equipment.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up a baffle plate, air duct, air inlet and air outlet, when the crossflow impeller rotates, cold air is drawn in from the air inlet and discharged from the air outlet after being acted upon by the crossflow impeller, cooling the transformer. At this time, the baffle plate intercepts a portion of the airflow from the air outlet, guides it to the air duct and discharges it from the top of the upper casing, forming a vertical air curtain. This air curtain is located between the air inlet and the air outlet, which can prevent the hot air discharged from the dry-type transformer from diffusing towards the air inlet. At the same time, the baffle plate concentrates the remaining airflow and blows it towards the key heat-generating parts of the transformer, enhancing the cooling effect and solving the problem of hot air circulation and intake.

[0013] 2. By setting up an adjustment component, when the transformer load rises and the temperature becomes too high, the stepper motor starts and drives the upper housing's rotating shaft to rotate through synchronous pulley two and synchronous belt. At the same time, gear two and gear three mesh, driving the lower housing's rotating shaft to rotate in the opposite direction. Gear one on the rotating shaft meshes with the tooth groove of the arc-shaped baffle, causing the upper and lower arc-shaped baffles to synchronously retract into the housing cavity, increasing the air inlet opening, increasing the air intake volume, and quickly removing excess heat from the transformer to meet different heat dissipation needs. Attached Figure Description

[0014] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a schematic diagram of the second perspective structure of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the lower shell and the upper shell in this invention; Figure 4 This is a schematic diagram of the airflow path in this invention; Figure 5 This is a cross-sectional structural diagram of the adjustment component in this invention; Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is an exploded view of the regulating component in this invention; Figure 8 for Figure 7 Enlarged structural diagram at point B.

[0015] The meanings of the labels in the diagram are as follows: 1. Lower housing; 11. Guide plate; 2. Upper housing; 21. Cut-off plate; 22. Air duct; 3. Crossflow impeller; 4. Side plate; 5. Servo motor; 6. Air inlet; 7. Adjustment assembly; 71. Arc-shaped baffle; 72. Rotating shaft; 73. Gear 1; 74. Gear groove; 75. Stepper motor; 76. Synchronous pulley 1; 77. Synchronous pulley 2; 78. Synchronous belt; 79. Gear 2; 710. Gear 3; 711. Baffle plate; 8. Air outlet; 9. Support frame; 10. Filter screen. Detailed Implementation

[0016] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0017] Because the existing dry-type transformer crossflow cooling fan has a short distance between the air inlet and outlet, hot air in the room is easily drawn in, resulting in low cooling efficiency and affecting the stable operation of the dry-type transformer.

[0018] Therefore, in view of the above-mentioned problems, the present invention provides a dry-type cross-flow cooling fan, with reference to... Figure 1-4As shown, the system includes a lower housing 1, with an upper housing 2 on top of the lower housing 1. Side plates 4 are installed on both sides of the lower housing 1 and the upper housing 2. A crossflow impeller 3 is rotatably mounted between the side plates 4. The crossflow impeller 3 consists of multiple blades distributed circumferentially along the rotating shaft, generating continuous and stable airflow during rotation. A servo motor 5 is fixedly mounted on the outer wall of the left side plate 4, and is bolted to the side plate 4. Its output shaft is connected to the rotating shaft on the left side of the crossflow impeller 3 via a coupling, driving the crossflow impeller 3 to rotate at high speed and providing power for airflow transmission. Air inlets 6 are provided at the front ends of the lower housing 1 and the upper housing 2. The air inlets 6 are rectangular openings used to draw in cool indoor air into the crossflow impeller 3. Transverse plates are welded to the rear ends of both the lower housing 1 and the upper housing 2. The transverse plates are long metal strips, and the two transverse plates are arranged parallel to each other to form an air outlet 8. The air outlet 8 faces the windings and core of the dry-type transformer to discharge cooling airflow. The bottom of the inner wall of the upper housing 2 is fixed... A baffle plate 21 is connected to the air outlet 8. The baffle plate 21 is an inclined metal plate located above the air outlet 8. It can block part of the airflow in the air outlet 8. An air passage 22 is opened inside the upper housing 2. The air passage 22 is a long strip channel inside the upper housing 2. One end is connected to the lower part of the baffle plate 21, and the other end passes through the top of the upper housing 2. When the airflow passes through the air outlet 8, the baffle plate 21 will intercept part of the airflow and guide it into the air passage 22. Finally, it will be discharged upward from the top opening of the air passage 22, forming a vertical downward air curtain between the air inlet 6 and the air outlet 8. This prevents the hot air discharged from the dry-type transformer from diffusing towards the air inlet 6. Multiple guide plates 11 are welded to the top of the horizontal plate of the lower housing 1. The guide plates 11 are thin metal plates and are evenly distributed below the air outlet 8. The guide plates 11 converge from the side near the lower housing 1 towards the air outlet 8 and towards the middle, so that the remaining airflow blown out from the air outlet 8 is concentrated at the winding end of the transformer, avoiding airflow dispersion and uneven cooling, thereby enhancing the cooling effect.

[0019] refer to Figure 4As shown, when the crossflow impeller 3 rotates, the blades are arc-shaped and tilted. The blades on the side of the air inlet 6 draw indoor cold air into the flow channel between the blades. After entering the crossflow impeller 3, the air is guided by the blades and does not flow in a straight radial direction, but rather tends to move tangentially along the arc surface of the blades. The central area of ​​the crossflow impeller 3 forms a low-pressure zone due to the continuous rotation of the blades, which generates an inward suction force on the air flowing into the flow channel, causing the airflow to form a spiral trajectory within the flow channel. As the crossflow impeller 3 continues to rotate, the spiral airflow continuously converges and accelerates within the flow channel, gradually forming a stable vortex. Because the air outlet 8 is located at the rear end of the fan, the distance between it and the impeller is less than the distance between the air inlet 6 and the impeller. Furthermore, the upper and lower horizontal plates of the air outlet 8 form a relatively closed airflow channel, which will produce a "guiding effect" on the airflow in the crossflow impeller 3. This causes the vortex center to shift towards the air outlet 8, so that the vortex area is mainly concentrated on the side of the impeller inside that is close to the air outlet 8. This vortex structure and position has two functions. On the one hand, it can gather the dispersed cold air into a continuous and uniform airflow bundle, avoiding uneven cooling caused by airflow interruption. On the other hand, the centrifugal force generated by the vortex can push the airflow towards the air outlet 8.

[0020] refer to Figure 4 As shown, when the airflow generated by the crossflow impeller 3 is delivered to the air outlet 8, the airflow channel in the upper part of the air outlet 8 is blocked by the obstruction plate 21, which is an inclined metal plate. At this time, the airflow is divided into two parts by the obstruction plate 21. One part of the airflow is discharged from the air outlet 8 below the obstruction plate 21 to cool the transformer. The other part of the airflow cannot flow towards the transformer due to the obstruction of the obstruction plate 21, and is instead guided by the obstruction plate 21 to the air passage 22 above it. The air passage 22 is a long strip-shaped channel opened inside the upper shell 2. The inner wall of the channel is smooth, forming a "vertical air curtain". When the dry-type transformer is running, the heat carried away by the cooling airflow will form hot air. This hot air will diffuse in the room, and some will flow towards the air inlet 6. When the hot air comes into contact with the vertically downward air curtain, the airflow pressure generated by the air curtain will resist the hot air, blocking the hot air and preventing it from approaching the air inlet 6, thus solving the problem of hot air circulation and intake.

[0021] refer to Figure 5-6As shown, an adjustment assembly 7 is installed inside the lower housing 1 and the upper housing 2. The adjustment assembly 7 is used to adjust the opening size of the air inlet 6 according to the transformer temperature. A rotating shaft 72 is rotatably installed inside both the lower housing 1 and the upper housing 2. The rotating shaft 72 is installed inside the lower housing 1 and the upper housing 2 through bearings and can rotate flexibly. Multiple gears 73 are fixedly connected to the outer wall of the rotating shaft 72. The gears 73 are coaxial with the rotating shaft 72 and rotate synchronously with the rotating shaft 72. Multiple sets of toothed grooves 74 are opened on the outer wall of the arc-shaped baffle 71. The teeth of the toothed groove 74 and the gear 73 are matched, and the gear 73 meshes with the toothed groove 74. During the adjustment stage, when the rotating shaft 72 rotates, the gear 73 will drive the arc-shaped baffle 71 to slide along the slide rail inside the housing through the toothed groove 74. When the arc-shaped baffle 71 retracts into the inner cavity of the lower housing 1 and the upper housing 2, the opening of the air inlet 6 increases from the initial state, and the air intake volume increases accordingly to meet the heat dissipation requirements of the transformer under high load. When the arc-shaped baffle 71 extends, it will block part of the air inlet 6, reduce the air intake volume, and reduce energy consumption.

[0022] refer to Figure 7-8 As shown, a stepper motor 75 is fixedly installed on the outer wall of the left side plate 4. The stepper motor 75 can precisely control the rotation angle. A synchronous pulley 76 is fixedly installed on the left end of the rotating shaft 72 inside the upper housing 2. The synchronous pulley 76 is coaxial with the rotating shaft 72. A synchronous pulley 77 is rotatably installed on the outer wall of the left side plate 4. The synchronous pulley 77 has the same diameter as the synchronous pulley 76. A synchronous belt 78 is fitted on the outer wall of the synchronous pulleys 76 and 77. The synchronous belt 78 is made of rubber and has toothed grooves on the inside to ensure that the synchronous pulleys 76 and 77 rotate synchronously in the same direction. A gear 79 is fixedly connected to the right side of the synchronous pulley 77. Gear 2 79 is coaxial with synchronous pulley 2 77. Gear 3 710 is fixedly connected to the left end of the rotating shaft 72 inside the lower housing 1. Gear 3 710 has the same number of teeth and diameter as gear 2 79. Gear 2 79 and gear 3 710 mesh with each other. When synchronous pulley 2 77 drives gear 2 79 to rotate clockwise, gear 3 710 will rotate counterclockwise, which in turn drives the rotating shaft 72 of the lower housing 1 to rotate counterclockwise. This achieves that the rotating shaft 72 in the lower housing 1 and the upper housing 2 rotate in opposite directions, which ultimately drives the upper and lower arc-shaped baffles 71 to retract or extend synchronously, ensuring that the opening size of the upper and lower parts of the air inlet 6 is consistent and the airflow is drawn in evenly.

[0023] refer to Figure 6 As shown, a baffle plate 711 is welded to the end of the arc-shaped baffle 71. The baffle plate 711 is a rectangular metal plate. The arc-shaped baffle 71 and the baffle plate 711 are distributed perpendicularly. The baffle plate 711 can further block the side air from entering the crossflow impeller 3, and at the same time enhance the structural strength of the arc-shaped baffle 71 to prevent it from deforming due to airflow impact.

[0024] refer to Figure 3As shown, multiple support frames 9 are fixedly connected between the lower housing 1 and the upper housing 2. The support frames 9 are evenly distributed inside the air inlet 6 to support the upper housing 2 and prevent the fan from deforming after long-term use. A filter screen 10 is installed between two adjacent support frames 9. The filter screen 10 is located on the outside of the crossflow impeller 3 and can filter dust and debris in the air to prevent them from entering the crossflow impeller 3 and causing blade wear.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry variable cross-flow cooling fan characterized by, Include: The lower shell (1), the top of the lower shell (1) is provided with the upper shell (2), the lower shell (1) and the upper shell (2) are rotatably installed with cross flow impeller (3), the front end of the lower shell (1) and the upper shell (2) is provided with air inlet (6), the rear end of the lower shell (1) and the upper shell (2) is welded with transverse plate, two transverse plates are distributed up and down to form air outlet (8); The inner wall of the upper shell (2) is fixedly connected with the cut-off plate (21), and the inside of the upper shell (2) is provided with the air channel (22), when the airflow passes through the air outlet (8), the cut-off plate (21) intercepts part of the airflow of the air outlet (8) to enter the air channel (22) and is discharged upward to form the air curtain.

2. A dry variable crossflow cooling fan as claimed in claim 1, characterized in that: The top of the transverse plate of the lower shell (1) is welded with a plurality of guide plates (11), the guide plates (11) are folded to the middle from the side close to the lower shell (1) to the direction of the air outlet (8), so that the airflow blown out from the air outlet (8) is concentrated to the middle.

3. A dry variable crossflow cooling fan as claimed in claim 1, wherein: The both sides of the lower shell (1) and the upper shell (2) are provided with side plates (4), and the rotating shafts of the both sides of the cross flow impeller (3) are rotatably installed in the side plates (4).

4. A dry variable crossflow cooling fan as claimed in claim 3, characterized in that: The outer wall of the left side plate (4) is fixedly installed with a servo motor (5), and the output shaft of the servo motor (5) is connected with the rotating shaft of the left side of the cross flow impeller (3).

5. A dry variable crossflow cooling fan as claimed in claim 3, wherein: The inside of the lower shell (1) and the upper shell (2) is provided with an adjusting assembly (7), the adjusting assembly (7) comprises an arc-shaped baffle (71) slidably installed in the inside of the lower shell (1) and the upper shell (2), a rotating shaft (72) rotatably installed in the inside of the lower shell (1) and the upper shell (2), a plurality of gear wheels (73) fixedly connected with the outer wall of the rotating shaft (72), a plurality of tooth grooves (74) formed in the outer wall of the arc-shaped baffle (71), the gear wheels (73) and the tooth grooves (74) are engaged, and the adjusting stage, the rotating shaft (72) is rotated to drive the arc-shaped baffle (71) to shrink in the inner cavity of the lower shell (1) and the upper shell (2) through the cooperation of the gear wheels (73) and the tooth grooves (74), and the opening of the air inlet (6) is increased.

6. A dry variable crossflow cooling fan as claimed in claim 5, characterized in that: The outer wall of the left side plate (4) is fixedly installed with a step motor (75), the left end of the rotating shaft (72) in the inside of the upper shell (2) is fixedly installed with a synchronous wheel (76), and the outer wall of the left side plate (4) is rotatably installed with a synchronous wheel (77), and the outer walls of the synchronous wheel (76) and the synchronous wheel (77) are sleeved with a synchronous belt (78).

7. A dry variable crossflow cooling fan as claimed in claim 6, characterized in that: The right side of the synchronous wheel (77) is fixedly connected with a gear wheel (79), the left end of the rotating shaft (72) in the inside of the lower shell (1) is fixedly connected with a gear wheel (710), and the gear wheel (79) and the gear wheel (710) are engaged with each other.

8. A dry variable pitch cooling fan as claimed in claim 5, wherein: The end of the arc-shaped baffle (71) is welded with a wind shield (711), and the arc-shaped baffle (71) and the wind shield (711) are vertically distributed.

9. A dry variable pitch cooling fan as claimed in claim 1, wherein: The lower shell (1) and the upper shell (2) are fixedly connected with a plurality of support frames (9), and the support frames (9) are located in the inside of the air inlet (6).

10. A dry variable crossflow cooling fan as claimed in claim 9, characterized in that: A filter screen (10) is installed between two adjacent support frames (9) and is located on the outer side of the cross-flow impeller (3).

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