A high-efficiency cooling type transformer

Abstract

The application discloses a high-efficiency cooling type transformer, which comprises a base frame (1), a coil assembly (2), a cross-flow cooling fan (3), a shell assembly (4), an impeller (5) and a power source (6), characterized in that an auxiliary rotor (53) is arranged in the inner cavity of the impeller, one end of the auxiliary rotor is connected with a connecting arm (54), the other end of the connecting arm is connected with a second rotating shaft (64), the power source comprises a first motor (61) and a second motor (62), the second rotating shaft is connected with the motor rotor of the second motor, a shaft end disc is connected with a first rotating shaft (63), the first rotating shaft is connected with the motor rotor of the first motor, and the second rotating shaft is installed in the first rotating shaft. The application can adjust the flow velocity and flow path of the airflow in the impeller cavity, thereby effectively improving the air speed and air volume of the cross-flow cooling fan and enhancing the cooling effect of the transformer.

Description

Technical Field

[0001] This invention relates to the field of power equipment and transformer technology, and specifically to a high-efficiency cooling transformer. Background Technology

[0002] Transformers used in power equipment can be classified into oil-immersed transformers and dry-type transformers. Dry-type transformers are further divided into natural cooling and forced cooling. For example... Figure 1 As shown, the existing dry-type transformer includes a base frame 1, a coil assembly 2, and a cross-flow cooling fan 3. The coil assembly 2 is installed on the upper part of the base frame 1, and the cooling fan 3 is installed on the side. The cooling fan 3 is used to force-cool the coil assembly 2. The cross-flow cooling fan 3 includes a housing assembly 4, an impeller 5, and a power source 6. The housing assembly includes a first volute, a second volute, a first side plate 4, and a shaft end side plate. The first volute and the second volute form an air outlet, and the second volute and the first side plate form a first air inlet. A second air inlet is provided on the first side plate. The shaft end side plate is perpendicular to the rotation axis of the impeller. The impeller includes a shaft end disk and blades. Multiple blades are distributed circumferentially along the shaft end disk. The impeller is a single or multi-segment type, and an auxiliary rotor is provided inside the impeller cavity.

[0003] However, existing crossflow cooling fans cannot set / control the speed of the second motor based on the transformer temperature, and cannot control the auxiliary rotor to rotate slowly and continuously according to the adjustment needs of the crossflow cooling fan's wind speed and air volume. As a result, the wind speed and air volume of the cooling fan are low, and the cooling effect on the transformer is poor. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-efficiency cooling transformer. The rotation speed of the second motor is set / controlled based on the transformer temperature. According to the adjustment needs of the crossflow cooling fan's wind speed and air volume, the auxiliary rotor is controlled to rotate slowly and continuously or rotate to a preset position and hold. At this time, the auxiliary rotor can rotate around the rotation axis of the impeller and can passively rotate under the action of airflow, thereby adjusting the airflow speed and flow path in the impeller cavity, thus effectively improving the wind speed and air volume of the crossflow cooling fan and enhancing the cooling effect of the transformer.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A high-efficiency cooling transformer includes a base frame (1), a coil assembly (2), and a cross-flow cooling fan (3). The coil assembly is mounted on the upper part of the base frame, and the cooling fan is mounted on the side. The cooling fan is used to force-cool the coil assembly. The cross-flow cooling fan includes a housing assembly (4), an impeller (5), and a power source (6). The housing assembly includes a first volute (41), a second volute (42), a first side plate (43), and a shaft end side plate (44). An air outlet (47) is formed between the first volute and the second volute, and a first air inlet (45) is formed between the second volute and the first side plate. A second air inlet (46) is provided on the first side plate. The plate is perpendicular to the rotation axis of the impeller. The impeller includes a shaft end disk (51) and blades (52). Multiple blades are distributed circumferentially along the shaft end disk. The impeller is a single or multi-segment type. The impeller is characterized by: an auxiliary rotor (53) is provided in the inner cavity of the impeller (5). One end of the auxiliary rotor is connected to a connecting arm (54). The other end of the connecting arm is connected to a second rotating shaft (64). The power source includes a first motor (61) and a second motor (62). The second rotating shaft is connected to the motor rotor of the second motor. The shaft end disk is connected to the first rotating shaft (63). The first rotating shaft is connected to the motor rotor of the first motor. The second rotating shaft is installed inside the first rotating shaft. The first rotating shaft is a hollow shaft.

[0007] Furthermore, the first motor (61) drives the impeller (5) to rotate via the first rotating shaft (63), and the second motor (62) drives the auxiliary rotor (53) to rotate slowly via the second rotating shaft (64) and the connecting arm (54). The rotation speed of the auxiliary rotor is less than that of the impeller. A bearing is provided between the first rotating shaft and the second rotating shaft, and the auxiliary rotor can rotate independently relative to the impeller.

[0008] Furthermore, the end of the auxiliary rotor (53) is connected to the pin (55) by a bearing, the other end of the pin is fixed to the connecting arm (54), and the other end of the connecting arm is fixed to the end of the first rotating shaft (63). At this time, the auxiliary rotor can rotate around the rotation axis of the impeller (5) and can passively rotate under the action of the airflow.

[0009] Furthermore, the end of the auxiliary rotor (53) is fixedly connected to a pin, the other end of the pin is fixed to a connecting arm, and the other end of the connecting arm is fixed to the end of the first rotating shaft. At this time, the auxiliary rotor can only rotate around the rotation axis of the impeller.

[0010] Furthermore, driven by the second rotating shaft (64), the auxiliary rotor (53) can rotate slowly and continuously according to the adjustment needs of the crossflow cooling fan's wind speed and air volume.

[0011] Furthermore, driven by the second rotating shaft (64), the auxiliary rotor can rotate to a preset position and maintain it under different working conditions according to the adjustment needs of the crossflow cooling fan's wind speed and air volume.

[0012] Furthermore, the second motor (62) can rotate in both directions, and the rotation direction of the auxiliary rotor (53) around the rotation axis of the impeller (5) is consistent with the rotation direction of the impeller.

[0013] Furthermore, the auxiliary rotor (53) includes serrated blades or arc-shaped blades disposed on its outer periphery, and multiple serrated blades or arc-shaped blades are evenly distributed circumferentially.

[0014] Furthermore, the second volute is provided with a volute tongue (48), which is the part with the smallest gap between the second volute and the outer periphery of the impeller. The first volute is provided with a throat (49), which is the part with the smallest gap between the first volute and the outer periphery of the impeller. The throat is located upstream of the volute tongue.

[0015] This invention discloses a high-efficiency cooling transformer. Based on the transformer's temperature, the rotation speed of a second motor is set / controlled. According to the adjustment needs of the crossflow cooling fan's air speed and air volume, the auxiliary rotor is controlled to slowly and continuously rotate or rotate to a preset position and hold. At this time, the auxiliary rotor can rotate around the impeller's rotation axis and can passively rotate under the action of airflow, thereby adjusting the airflow velocity and flow path in the impeller cavity. This effectively increases the airflow velocity and air volume of the crossflow cooling fan, enhancing the transformer's cooling effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a dry-type transformer in the prior art;

[0017] Figure 2 This is a schematic diagram of the cooling fan structure of the high-efficiency cooling transformer of the present invention;

[0018] Figure 3 This is a schematic diagram of the cooling fan structure of the high-efficiency cooling transformer of the present invention;

[0019] Figure 4 This is a schematic diagram of the cooling fan structure of the high-efficiency cooling transformer of the present invention.

[0020] In the diagram: 1. Base frame; 2. Coil assembly; 3. Crossflow cooling fan; 4. Housing assembly; 5. Impeller; 6. Power source; 41. First volute; 42. Second volute; 43. First side plate; 44. Shaft end side plate; 45. First air inlet; 46. Second air inlet; 47. Air outlet; 48. Volute tongue; 49. Throat; 51. Shaft end disc; 52. Blade; 53. Auxiliary rotor; 54. Connecting arm; 55. Pin; 61. First motor; 62. Second motor; 63. First rotating shaft; 64. Second rotating shaft. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figure 1-4 As shown, a high-efficiency cooling transformer includes a base frame 1, a coil assembly 2, and a cross-flow cooling fan 3. The coil assembly 2 is mounted on the upper part of the base frame 1, and the cooling fan 3 is mounted on the side. The cooling fan 3 is used for forced air cooling of the coil assembly 2. The cross-flow cooling fan 3 includes a housing assembly 4, an impeller 5, and a power source 6. The housing assembly 4 includes a first volute 41, a second volute 42, a first side plate 43, and a shaft end side plate 44. An air outlet 47 is formed between the first volute 41 and the second volute 42, and a first air inlet 45 is formed between the second volute 42 and the first side plate 43. A second air inlet 46 is provided on the first side plate 43. The shaft end side plate 44 is perpendicular to the rotation of the impeller 5. The impeller 5 includes a shaft end disk 51 and blades 52. Multiple blades 52 are distributed circumferentially along the shaft end disk 51. The impeller 5 is a single or multi-segment type. The impeller 5 is characterized by having an auxiliary rotor 53 in its inner cavity / impeller cavity. One end of the auxiliary rotor 53 is connected to a connecting arm 54, and the other end of the connecting arm 54 is connected to a second shaft 64. The power source 6 includes a first motor 61 and a second motor 62. The second shaft 64 is connected to the motor rotor of the second motor 62. The shaft end disk 51 is connected to a first shaft 63. The first shaft 63 is connected to the motor rotor of the first motor 61. The second shaft 64 is installed inside the first shaft 63. The first shaft 63 is a hollow shaft.

[0024] Furthermore, the first motor 61 drives the impeller 5 to rotate via the first rotating shaft 63, and the second motor 62 drives the auxiliary rotor 53 to rotate slowly via the second rotating shaft 64 and the connecting arm 54. The rotation speed of the auxiliary rotor 53 is less than that of the impeller 5. A bearing is provided between the first rotating shaft 63 and the second rotating shaft 64, and the auxiliary rotor 53 can rotate independently relative to the impeller 5.

[0025] In one embodiment, the end of the auxiliary rotor 53 is connected to the pin 55 by a bearing, the other end of the pin 55 is fixed to the connecting arm 54, and the other end of the connecting arm 54 is fixed to the end of the first rotating shaft 63. At this time, the auxiliary rotor 53 can rotate around the rotation axis of the impeller 5 and can passively rotate under the action of airflow.

[0026] In another embodiment, the end of the auxiliary rotor 53 is fixedly connected to the pin 55, the other end of the pin 55 is fixed to the connecting arm 54, and the other end of the connecting arm 54 is fixed to the end of the first rotating shaft 63. In this case, the auxiliary rotor 53 can only rotate around the rotation axis of the impeller 5.

[0027] In one embodiment, driven by the second rotating shaft 64, the auxiliary rotor 53 can rotate slowly and continuously according to the adjustment needs of the wind speed and air volume of the crossflow cooling fan 3.

[0028] In another embodiment, driven by the second rotating shaft 64, the auxiliary rotor 53 can rotate to a preset position and maintain it under different operating conditions (based on the temperature of the transformer to set / control the speed of the second motor 62), such as positions P1, P2, P3, etc., according to the adjustment needs of the wind speed and air volume of the crossflow cooling fan 3.

[0029] The present invention discloses a high-efficiency cooling transformer. Based on the temperature of the transformer, the rotation speed of the second motor 62 is set / controlled. According to the adjustment needs of the wind speed and air volume of the crossflow cooling fan 3, the auxiliary rotor 53 is controlled to rotate slowly and continuously or rotate to a preset position and hold. At this time, the auxiliary rotor 53 can rotate around the rotation axis of the impeller 5 and can passively rotate under the action of airflow. This can adjust the flow rate and flow path of the airflow in the impeller cavity, thereby effectively increasing the wind speed and air volume of the crossflow cooling fan 3 and enhancing the cooling effect of the transformer.

[0030] Furthermore, the second motor 62 can rotate in both directions. Preferably, the direction of rotation of the auxiliary rotor 53 around the rotation axis of the impeller 5 is the same as the direction of rotation of the impeller 5.

[0031] Furthermore, the auxiliary rotor 53 includes serrated blades or arc-shaped blades disposed on its outer periphery, with multiple serrated blades or arc-shaped blades evenly distributed circumferentially.

[0032] Furthermore, the second volute 42 is provided with a volute tongue 48, which is the part with the smallest gap between the second volute 42 and the outer periphery of the impeller 5. The first volute 41 is provided with a throat 49, which is the part with the smallest gap between the first volute 41 and the outer periphery of the impeller 5. The throat 49 is located upstream of the volute tongue 48.

[0033] The present invention discloses a high-efficiency cooling transformer. Based on the temperature of the transformer, the rotation speed of the second motor 62 is set / controlled. According to the adjustment needs of the wind speed and air volume of the crossflow cooling fan 3, the auxiliary rotor 53 is controlled to rotate slowly and continuously or rotate to a preset position and hold. At this time, the auxiliary rotor 53 can rotate around the rotation axis of the impeller 5 and can passively rotate under the action of airflow. This can adjust the flow rate and flow path of the airflow in the impeller cavity, thereby effectively increasing the wind speed and air volume of the crossflow cooling fan 3 and enhancing the cooling effect of the transformer.

[0034] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency cooling transformer, comprising a base frame (1), a coil assembly (2), and a crossflow cooling fan (3), wherein the coil assembly is mounted on the upper part of the base frame and the crossflow cooling fan is mounted on the side, the crossflow cooling fan being used for forced air cooling of the coil assembly, the crossflow cooling fan comprising a housing assembly (4), an impeller (5), and a power source (6), the housing assembly comprising a first volute (41), a second volute (42), a first side plate (43), and a shaft end side plate (44), an air outlet (47) being formed between the first volute and the second volute, a first air inlet (45) being formed between the second volute and the first side plate, a second air inlet (46) being provided on the first side plate, the shaft end side plate being perpendicular to the rotation axis of the impeller, the impeller comprising a shaft end disk (51) and blades (52), multiple blades being distributed circumferentially along the shaft end disk, the impeller being a single or multiple segment type, characterized in that: An auxiliary rotor (53) is provided in the inner cavity of the impeller. One end of the auxiliary rotor is connected to a connecting arm (54), and the other end of the connecting arm is connected to a second rotating shaft (64). The power source includes a first motor (61) and a second motor (62). The second rotating shaft is connected to the motor rotor of the second motor. The shaft end disc is connected to the first rotating shaft (63). The first rotating shaft is connected to the motor rotor of the first motor. The second rotating shaft is installed inside the first rotating shaft. The first rotating shaft is a hollow shaft. The first motor drives the impeller to rotate through the first rotating shaft, and the second motor drives the auxiliary rotor to rotate slowly through the second rotating shaft and the connecting arm. The speed of the auxiliary rotor is less than the speed of the impeller. A bearing is provided between the first rotating shaft and the second rotating shaft, and the auxiliary rotor can rotate independently relative to the impeller. The end of the auxiliary rotor is connected to the pin (55) by a bearing, the other end of the pin is fixed to the connecting arm (54), and the other end of the connecting arm is fixed to the end of the first rotating shaft (63). At this time, the auxiliary rotor can rotate around the rotation axis of the impeller and can passively rotate under the action of airflow; or, the end of the auxiliary rotor (53) is fixedly connected to the pin, the other end of the pin is fixed to the connecting arm, and the other end of the connecting arm is fixed to the end of the first rotating shaft. At this time, the auxiliary rotor can only rotate around the rotation axis of the impeller. The speed of the second motor (62) is controlled based on the temperature of the transformer.

2. The high-efficiency cooling transformer as described in claim 1, characterized in that, Driven by the second shaft (64), the auxiliary rotor (53) can rotate slowly and continuously according to the adjustment needs of the crossflow cooling fan's wind speed and air volume.

3. The high-efficiency cooling transformer as described in claim 1, characterized in that, Driven by the second rotating shaft (64), the auxiliary rotor can rotate to a preset position and maintain it under different working conditions according to the adjustment needs of the crossflow cooling fan's wind speed and air volume.

4. A high-efficiency cooling transformer as described in claim 3, characterized in that, The second motor (62) can rotate in both directions, and the rotation direction of the auxiliary rotor (53) around the rotation axis of the impeller (5) is consistent with the rotation direction of the impeller.

5. A high-efficiency cooling transformer as described in claim 1, characterized in that, The auxiliary rotor (53) includes serrated blades or arc-shaped blades disposed on its outer periphery, and multiple serrated blades or arc-shaped blades are evenly distributed circumferentially.

6. A high-efficiency cooling transformer as described in claim 1, characterized in that, The second volute is provided with a volute tongue (48), which is the part with the smallest gap between the second volute and the outer periphery of the impeller. The first volute is provided with a throat (49), which is the part with the smallest gap between the first volute and the outer periphery of the impeller. The throat is located upstream of the volute tongue.

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