Composite magnetic voltage regulator

Abstract

This invention discloses a composite magnetic voltage regulator, relating to the field of voltage regulator technology. It includes a housing and a magnetic core arranged inside the housing. A partition divides the inner cavity of the housing into inner and outer air paths. The windings and regulating coils are located in the inner air path. Inside the housing, a first fan is arranged along the length of the partition. Two first fans are symmetrically distributed front and back around the partition. The air outlet of each first fan is a rectangular outlet. A partition is rotatably mounted inside the rectangular outlet via a second rotating shaft. The second rotating shaft is inserted into the upper part of the partition, which divides the outlet into inner and outer sections. The inner outlet communicates with the inner air path, and the outer outlet communicates with the outer air path. The inner air path encloses all the windings and regulating coils for concentrated and effective heat dissipation, while guiding the airflow of the outer air path to contact other accessories, achieving dynamic airflow adjustment and realizing a composite heat dissipation system combining heat convection and air cooling.

Description

Technical Field

[0001] This invention relates to the field of voltage regulator technology, and more specifically to a composite magnetic voltage regulator. Background Technology

[0002] Magnetic voltage regulators, as key voltage stabilizing devices in power systems, are widely used in industrial, commercial, and residential power supply sectors. Their main function is to precisely control the output voltage by adjusting magnetic flux, ensuring the stable operation of the power system and the normal operation of electrical equipment. Based on different cooling methods, magnetic voltage regulators are generally divided into two types: oil-immersed and dry-type. Among them, dry-type magnetic voltage regulators have gained increasingly widespread application in the market in recent years due to their compact structure, simple maintenance, and environmental friendliness. Dry-type magnetic voltage regulators use an air-cooling system for heat dissipation, using forced airflow to remove the heat generated by the windings and magnetic core during operation, ensuring the equipment operates within a safe temperature range. Its main components include the magnetic core, primary winding, secondary winding, regulating coil, air-cooling system, and control system.

[0003] The regulating coil adjusts the magnetic flux by inputting a direct current, thereby controlling the output voltage. During voltage regulation, the heat generated increases with the increase of the input direct current to the regulating coil. Existing air-cooling systems often cannot adjust the airflow distribution in time to cope with such rapidly changing heat dissipation demands, resulting in delayed heat dissipation and further affecting the temperature control and voltage stability of the equipment. In addition, the lack of precise control over the cooling airflow direction leads to excessively high or low airflow in some areas, failing to meet the heat dissipation needs of different windings. This not only affects the overall heat dissipation effect but may also cause localized overheating or insufficient cooling.

[0004] In summary, existing dry-type magnetic voltage regulators have shortcomings in areas such as air-cooled flow distribution and airflow contact efficiency. These problems not only affect the voltage regulation accuracy and equipment reliability of the magnetic voltage regulator, but also limit its application in power systems with higher requirements. Therefore, we propose a composite magnetic voltage regulator. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention provides a composite magnetic voltage regulator.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a composite magnetic voltage regulator, comprising a housing and a magnetic core arranged inside the housing. A primary winding, an adjusting coil, and a secondary winding are wound on the magnetic core. A partition cover is fitted around the outer side of the magnetic core, dividing the inner cavity of the housing into inner and outer air paths. The winding and adjusting coil are located in the inner air path. A first fan is also arranged inside the housing along the length of the partition cover. Two first fans are arranged symmetrically back and forth with the partition cover as the center. The air outlet of the first fan is a rectangular air outlet. A partition is rotatably installed inside the rectangular air outlet via a second rotating shaft. The second rotating shaft is inserted into the upper part of the partition, dividing the air outlet into inner and outer sections. The inner air outlet communicates with the inner air path, and the outer air outlet communicates with the outer air path. The cross-sectional area of ​​the inner air outlet is proportional to the temperature within the inner air path.

[0007] Preferably, an air guide plate is rotatably installed inside the partition cover via a first rotating shaft. Two sets of air guide plates are provided, and the two sets of air guide plates are symmetrically distributed front and back with the magnetic core as the center. The first rotating shaft is inserted in the middle of the air guide plate. As the temperature inside the internal air passage rises, the air guide plate rotates toward the direction closer to the magnetic core, so that an air gap with a wider bottom and a narrower top is formed between the air guide plate and the magnetic core.

[0008] Preferably, the outer side of the partition cover is equipped with several fins.

[0009] Preferably, the fins are composed of several fin strips spliced ​​together in the vertical direction, and two adjacent fin strips are slidably assembled in the partition cover along their length direction; two adjacent fins are arranged on both sides of the air guide plate, and the left end of the air guide plate has a through groove that runs from left to right, the number of grooves matching the number of fin strips; the fin strip in the middle is fixedly interlocked with the partition cover, and among the remaining fin strips, two adjacent fin strips are connected by a connecting rod, which is slidably assembled in the through groove at the corresponding position; the end of the fin strip near the magnetic core has a first air duct with an arc-shaped structure, and the lower side of the end of the fin strip near the magnetic core has an arc-shaped guide part.

[0010] Preferably, a second air duct is provided at the lower end of the fin strip, which is narrow at the bottom and wide at the top. The overlapping area between two adjacent second air ducts forms a first air duct. The overlapping area between the adjacent second air ducts and the first air duct forms a second air duct. As the air guide plate rotates toward the direction closer to the magnetic core, the area of ​​the first air duct gradually increases and the area of ​​the second air duct gradually decreases.

[0011] Preferably, one end of the first rotating shaft extends to the outside of the partition cover and is fixedly sleeved with a first gear, which meshes with a first rack; one end of the second rotating shaft extends to the outside of the rectangular air outlet and is fixedly sleeved with a second gear, which meshes with a second rack; a movable frame is installed between the first rack and the second rack; the movable frame is slidably mounted on the partition cover in the horizontal direction; and a horizontally positioned push rod is fixedly connected to the movable frame; the push rod moves linearly in the horizontal direction.

[0012] Preferably, a piston is installed at the end of the push rod, and the piston is slidably sleeved in the inner cavity of the sleeve; the separator has a cavity structure, and the cavity is filled with thermally expanding gas, and the cavities of the sleeve and the separator are connected.

[0013] Preferably, a return spring is fitted onto the outer circumference of the push rod, with one end of the return spring connected to the piston; both ends of the sleeve are provided with through holes.

[0014] Preferably, a second fan is provided inside the housing, which is arranged along the width direction of the partition cover.

[0015] Preferably, an exhaust fan is installed on the top of the casing, and the exhaust fan's outlet is connected to the external environment.

[0016] Compared with the prior art, the present invention provides a composite magnetic voltage regulator, which has the following advantages:

[0017] (1) In this invention, the inner cavity of the outer shell is divided into a first air path and a second air path by setting a partition cover. The first winding, the regulating coil and the second winding are wrapped in the first air path, and other accessories are located in the second air path. The hot air in the first air path moves upward and the relatively low temperature air in the second air path moves downward. The convection flow generated spontaneously by the temperature difference is used to achieve efficient heat transfer, avoid the hot air from lingering in the first air path, and maintain a continuous low temperature environment around the heating elements such as the winding and the regulating coil.

[0018] (2) By setting up a partition, the air outlet of the first fan is divided into two parts, an inner and an outer one, and the inner air outlet is connected to the inner air path. As the temperature in the inner air path rises, the area of ​​the inner air outlet increases, guiding more air path into the inner air path, realizing the adaptive distribution of heat generation and air volume, and meeting the heat dissipation needs of the winding and regulating coil under different working conditions.

[0019] (3) By setting up a guide plate to form an air gap that is wider at the bottom and narrower at the top between it and the magnetic core, the airflow speed in the inner air path is accelerated by utilizing the Venturi effect.

[0020] (4) By setting heat dissipation fins, the high temperature heat in the first air path is transferred to the outer air path, avoiding the heat concentration in the inner air path. When the temperature in the inner air path rises, the heat dissipation fins form a stepped structure with a wider bottom and a narrower top along with the air guide plate. At each step, the direction of some airflow is changed through the first air duct and the arc-shaped guide part, which increases the contact area and contact time of the airflow and the winding and the adjustment coil, thereby improving the heat exchange efficiency.

[0021] (5) The two adjacent second air ducts overlap to form the first air duct. As the air guide plate rotates towards the magnetic core, the area of ​​the first air duct gradually increases, allowing more cold air from the bottom to be transported directly upward. The adjacent second air ducts overlap with the first air duct to form the second air duct, which guides the cold air at the bottom of the inner air path to move upward and then discharges it through the second air ducts at different heights, thereby improving the heat dissipation efficiency of different height areas in the inner air path and greatly reducing the probability of local overheating.

[0022] (6) By setting the push rod to move in the horizontal direction, the movement of the air guide plate and the partition plate is synchronously driven. At the same time, the temperature rise in the internal air path causes the expansion gas in the inner cavity of the partition to expand due to heat. The expansion gas then increases the pressure on the piston, thereby realizing the linear movement of the push rod in the horizontal direction. This avoids the need to add drive components, which not only reduces manufacturing costs but also reduces electromagnetic interference generated when the external drive components are controlled. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the entire composite magnetic voltage regulator in the embodiment;

[0025] Figure 2 This is a schematic diagram of the internal structure of the entire composite magnetic voltage regulator in the embodiment.

[0026] Figure 3 This is a schematic diagram of the exhaust fan assembly in the embodiment;

[0027] Figure 4 for Figure 2 Another structural diagram from a different angle;

[0028] Figure 5 This is a schematic cross-sectional view of the first fan in the embodiment;

[0029] Figure 6 This is a schematic diagram of the assembly of the partition cover in the embodiment;

[0030] Figure 7 This is a schematic diagram of the assembly of the air guide plate in the embodiment;

[0031] Figure 8 This is a schematic diagram of the assembly of the heat sink fins in the embodiment;

[0032] Figure 9 This is a partial cross-sectional structural diagram of the partition cover in the embodiment;

[0033] Figure 10 This is a schematic diagram of the assembly of the first gear and the second gear in the embodiment;

[0034] Figure 11 This is a schematic cross-sectional view of the finned strip in the embodiment.

[0035] In the diagram: 1. Outer casing; 2. Magnetic core; 3. Primary winding; 4. Adjustment coil; 5. Secondary winding;

[0036] 6. Partition cover; 61. Air guide plate; 62. First rotating shaft; 63. First gear; 64. Through slot; 65. Fin; 651. Fin strip; 652. Connecting rod; 653. First air duct; 654. Second air duct; 655. Arc-shaped guide part; 66. First rack; 67. Movable frame; 68. Push rod; 69. Piston; 610. Sleeve; 611. Return spring; 612. Through hole;

[0037] 7. First fan; 71. Rectangular air outlet;

[0038] 8. Partition plate; 81. Second rotating shaft; 82. Second gear; 83. Second rack;

[0039] 9. Exhaust fan; 10. Secondary fan. Detailed Implementation

[0040] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] This embodiment proposes a composite magnetic voltage regulator, such as... Figures 1 to 11As shown, the device includes a housing 1 and a magnetic core 2 arranged inside the housing 1. A primary winding 3, an regulating coil 4, and a secondary winding 5 are wound on the magnetic core 2. The composite magnetic voltage regulator controls the magnetic flux in the magnetic core 2 by inputting a DC current to the regulating coil 4, thereby regulating the output voltage of the secondary winding 5. During this process, changes in the current of the regulating coil 4 affect the saturation level and permeability of the magnetic core 2. For example, assuming the input voltage of the primary winding 3 remains constant and the load resistance remains constant, if the input current of the regulating coil 4 gradually increases, the total magnetic flux in the magnetic core 2 increases, and the magnetic core 2 approaches saturation. The decrease in permeability leads to a decrease in the inductance of regulating coil 4, which in turn reduces the reactance of primary winding 3. Since the voltage of primary winding 3 remains constant, the decrease in reactance results in an increase in the AC current of primary winding 3. The induced voltage of secondary winding 5 is determined by magnetic flux; an increase in magnetic flux leads to an increase in the induced voltage of secondary winding 5. With a constant load resistance, the increased output voltage leads to an increase in the output current of secondary winding 5. According to Joule's law, the heat generated in the winding is proportional to the square of the current. An increase in current leads to an increase in the heat generated in the winding coil, requiring an optimized air-cooling system for effective cooling. For heat dissipation, existing dry-type magnetic voltage regulators typically use fans to directly blow cold air onto each winding and accessory, dissipating heat through natural airflow. While this design alleviates heat accumulation to some extent, the lack of a dedicated airflow path results in uneven cold air distribution, making it difficult to achieve efficient heat dissipation under high load conditions. Therefore, in this embodiment, a partition cover 6 is fitted around the outer side of the magnetic core 2. The partition cover 6 divides the inner cavity of the outer shell 1 into inner and outer airflow paths. The windings and regulating coil 4 are located in the inner airflow path, while the remaining accessories are located in the outer airflow path. The interior of the outer shell 1 is also equipped with a distribution system along the length of the partition cover 6. The first fan 7 is provided, and there are two first fans 7, which are symmetrically distributed front and back with the partition cover 6 as the center. The air outlet of the first fan 7 is provided with a rectangular air outlet 71. A partition 8 is rotatably installed inside the rectangular air outlet 71 through a second rotating shaft 81. The second rotating shaft 81 is inserted in the upper part of the partition 8. The partition 8 divides the air outlet into two parts, an inner air outlet and an outer air outlet, which are connected to the inner air path and an outer air outlet and an outer air path. When the input current of the regulating coil 4 increases, the temperature in the inner air path rises, and the partition 8 rotates away from the magnetic core 2, increasing the cross-sectional area of ​​the inner air outlet and guiding more air volume to the inner air path.

[0042] In this embodiment, sliders are installed at the lower ends of both ends of the partition 8. An arc-shaped groove is provided in the rectangular air outlet 71 corresponding to the position of the slider, and the slider is slidably assembled in the groove. When the partition 8 rotates outward, the slider rotates outward synchronously in the groove. The groove limits the rotation range of the slider, so that the partition 8 is vertically set in the initial state, making the cross-sectional areas of the inner and outer air outlets equal. As the input current in the regulating coil 4 increases, the partition 8 rotates outward synchronously. The groove limits its maximum rotation angle, ensuring the minimum heat dissipation requirements of other accessories and avoiding overheating of the accessories.

[0043] When the partition 8 rotates outward, the air volume distributed to the inner air passage increases. In order to further improve the heat dissipation efficiency of components such as windings and coils, in this embodiment, a guide plate 61 is rotatably installed inside the partition cover 6 via a first rotating shaft 62. Two sets of guide plates 61 are provided, and the two sets of guide plates 61 are symmetrically distributed front and back with the magnetic core 2 as the center. The first rotating shaft 62 is inserted in the middle of the guide plate 61. As the temperature inside the inner air passage rises, the guide plate 61 rotates towards the direction closer to the magnetic core 2, so that an air gap with a wider bottom and a narrower top is formed between the guide plate 61 and the magnetic core 2. The Venturi effect is used to accelerate the airflow speed in the inner air passage, thereby improving the heat dissipation efficiency of components such as windings and regulating coils 4.

[0044] Based on the above scheme, since the partition cover 6 encloses the primary winding 3, the regulating coil 4, and the secondary winding 5 in the inner air passage, the heat generated by the windings and coils during operation raises the air temperature in the inner air passage, reduces the density of the hot air, and causes it to move upward, carrying away the generated heat. As the hot air rises, the relatively cool air in the outer air passage is introduced, forming a circulating flow. This air exchange promotes the continuous transfer and dissipation of heat. However, the heat concentration in the inner air passage may cause local overheating of the magnetic core 2, increasing the risk of saturation of the magnetic core 2, and thus causing instability in the output voltage. Therefore, in this embodiment, several fins 65 are installed on the outside of the partition cover 6 to increase the contact area between the partition cover 6 and the relatively cool air in the outer air passage, thereby improving the heat dissipation efficiency.

[0045] In addition, in the internal airflow path, the airflow and the windings and coils generate heat exchange and rise upwards. During this process, the contact time between the airflow and the heating element is limited, resulting in a decrease in heat exchange efficiency. Therefore, in this embodiment, the fins 65 are composed of several fin strips 651 spliced ​​together in the vertical direction, and two adjacent fin strips 651 are slidably assembled in the partition cover 6 along their length direction; two adjacent fins 65 are arranged on both sides of the air guide plate 61, and the left end of the air guide plate 61 has a through groove 64 that runs from left to right. The number of through grooves 64 is adapted to the number of fin strips 651; the fin strip 651 in the middle is fixedly inserted and connected to the partition cover 6, and among the remaining fin strips 651, a connecting rod 652 is installed between two adjacent fin strips 651 on the left and right sides. The connecting rod 652 is slidably assembled in the through groove 64 at the corresponding position; the end of the fin strip 651 near the magnetic core 2 has a first arc-shaped structure. Air duct 653; In this embodiment, the first air duct 653 has a quarter-circle arc structure, and the diameter of the first air duct 653 gradually increases from bottom to top; an arc-shaped guide portion 655 is provided on the lower side of the end of the fin strip 651 near the magnetic core 2; When the air guide plate 61 rotates toward the direction of approaching the magnetic core 2, several fin strips 651 in the fin 65 form a stepped structure that gradually approaches the magnetic core 2, so that an air gap with a wider bottom and a narrower top is formed between the fin 65 and the magnetic core 2, which increases the flow speed of the airflow. At the same time, when part of the upward airflow passes through the first air duct 653 or the arc-shaped guide portion 655, the direction of movement is changed to move toward the direction of approaching the magnetic core 2 through the first air duct 653 or the arc-shaped guide portion 655, which increases the contact area between the airflow and the winding and coil, and also appropriately reduces the airflow speed, taking into account the airflow speed and the contact time between the airflow and the heating element, thus improving the heat exchange efficiency.

[0046] In the internal airflow path, the temperature of the airflow gradually increases as it moves upward. Since the primary winding 3 is arranged above the regulating coil 4, when the airflow moves to the vicinity of the primary winding 3, the temperature difference between it and the primary winding 3 is small, resulting in a decrease in heat exchange efficiency. Therefore, in this embodiment, a second airflow channel 654 is provided at the lower end of the fin strip 651, which is narrow at the bottom and wide at the top. The overlapping area between two adjacent second airflow channels 654 forms a first airflow channel. The overlapping area between adjacent second airflow channels 654 and the first airflow channel 653 forms a second airflow channel. As the air guide plate 61 rotates toward the direction closer to the magnetic core 2, the area of ​​the first airflow channel gradually increases, and the area of ​​the second airflow channel gradually decreases. Some airflow that does not come into contact with the regulating coil 4 can move upward through the first airflow channel and be discharged through the first airflow channel 653 at different positions during the upward movement. This achieves the purpose of inputting low-temperature air to the area near the primary winding 3, alleviating the uneven temperature rise from bottom to top in the internal airflow path. It should be noted that in the initial state, the area of ​​the first air passage is the smallest, the area of ​​the second air passage is the largest, the amount of gas moving upward through the first air passage is the smallest, and most of the gas changes direction through the arc-shaped guide 655; as the area of ​​the first air passage increases, the amount of gas moving upward through the first air passage increases, and this part of the gas can change direction through the first air passage 653 at different positions, thereby achieving the purpose of delivering cold air to areas at different heights.

[0047] Based on the above scheme, in this embodiment, the partition 8 and the air guide plate 61 are driven by the same power source to minimize the electromagnetic interference generated during the control of the power drive components. Specifically, one end of the first rotating shaft 62 extends to the outside of the partition cover 6 and is fixedly sleeved with the first gear 63, which meshes with the first rack 66; one end of the second rotating shaft 81 extends to the outside of the rectangular air outlet 71 and is fixedly sleeved with the second gear 82, which meshes with the second rack 83. A movable frame 67 is installed between the first rack 66 and the second rack 83, and the movable frame 67 is slidably assembled in the horizontal direction on the partition cover 6. On the partition 6, a horizontally arranged push rod 68 is fixedly connected to the movable frame 67. The push rod 68 is connected to the output end of the linear drive component. When the input current of the regulating coil 4 increases, the linear drive component drives the push rod 68 to move away from the partition 6. The first rack 66 and the second rack 83 drive the first gear 63 and the second gear 82 to rotate respectively. The rotation of the first gear 63 drives the air guide plate 61 to rotate towards the magnetic core 2, so that an air gap with a wider bottom and a narrower top is formed between the air guide plate 61 and the magnetic core 2. The rotation of the second rack 83 drives the partition 8 to rotate away from the partition 6, increasing the air intake of the inner air passage.

[0048] To avoid electromagnetic interference from the linear drive components, this embodiment utilizes the principle of gas thermal expansion to drive the push rod 68 in a horizontal linear motion. Specifically, a piston 69 is installed at the end of the push rod 68, and the piston 69 is slidably fitted into the inner cavity of the sleeve 610. The partition cover 6 has a cavity structure, and the cavity is filled with thermally expanding gas. The sleeve 610 and the cavity of the partition cover 6 are connected. When the input current of the regulating coil 4 increases, the gas temperature in the inner air path rises, and the thermally expanding gas in the cavity of the partition cover 6 expands and increases in volume, which increases the gas pressure in the sleeve 610. The gas exerts an outward pushing force on the piston 69, causing the piston 69 to move outward, thereby driving the push rod 68 to move outward in the horizontal direction. This design achieves adaptive adjustment of temperature, air intake volume, and airflow velocity in the inner air path.

[0049] Based on the above scheme, in order to achieve automatic reset of piston 69, in this embodiment, a reset spring 611 is sleeved on the outer circumferential surface of push rod 68, and one end of reset spring 611 is connected to piston 69; in order to ensure that the expanding gas in sleeve 610 can expand due to heat, through holes 612 are provided at both ends of sleeve 610 so that the gas pressure outside piston 69 is equal to that of the environment.

[0050] If the first fan 7 fails, all heat-generating components will lose effective heat dissipation, which may lead to overheating and damage to the equipment. Therefore, redundancy needs to be designed. For this purpose, in this embodiment, a second fan 10 is provided inside the outer casing 1 along the width direction of the partition cover 6, and there are two second fans 10 arranged symmetrically on the left and right with the partition cover 6 as the center.

[0051] In order to further improve the heat exchange efficiency of the internal and external air ducts, in this embodiment, an exhaust fan 9 is installed on the top of the outer casing 1, and the air outlet of the exhaust fan 9 is connected to the external environment.

[0052] In the description of this invention, the terms "first," "second," "another," and "yet another" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of embodiments of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0054] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite magnetic voltage regulator, comprising a housing (1) and a magnetic core (2) disposed inside the housing (1), wherein a primary winding (3), an adjusting coil (4) and a secondary winding (5) are wound on the magnetic core (2), characterized in that: A partition cover (6) is fitted on the outside of the magnetic core (2). The partition cover (6) divides the inner cavity of the outer shell (1) into two air paths, an inner one and an outer one. The winding and the regulating coil (4) are located in the inner air path. The outer shell (1) is also equipped with a first fan (7) arranged along the length of the partition cover (6). There are two first fans (7) and they are symmetrically distributed in front and behind with the partition cover (6) as the center. The air outlet of the first fan (7) is provided with a rectangular air outlet (71). A partition (8) is rotatably installed in the rectangular air outlet (71) through a second rotating shaft (81). The second rotating shaft (81) is inserted in the upper part of the partition (8). The partition (8) divides the air outlet into two, an inner one and an outer one. The inner air outlet is connected to the inner air path, and the outer air outlet is connected to the outer air path. The cross-sectional area of ​​the inner air outlet is proportional to the temperature in the inner air path. Inside the partition cover (6), a guide plate (61) is rotatably mounted via a first rotating shaft (62). The guide plate (61) has two sets, and the two sets of through-slot guide plates (61) are symmetrically distributed front and back with the magnetic core (2) as the center. The first rotating shaft (62) is inserted in the middle of the guide plate (61). As the temperature inside the internal air passage increases, the guide plate (61) rotates toward the direction closer to the magnetic core (2), so that an air gap with a wider bottom and a narrower top is formed between the guide plate (61) and the magnetic core (2). Several fins (65) are installed on the outside of the partition cover (6); The fins (65) are composed of several fin strips (651) spliced ​​together in the vertical direction, and two adjacent fin strips (651) are slidably assembled in the partition cover (6) along their length direction; two adjacent fins (65) are arranged on both sides of the air guide plate (61), and the left end of the air guide plate (61) is provided with a through groove (64) that runs from left to right, the number of through grooves (64) matching the number of fin strips (651); the fin strips (651) in the middle and the partition cover (65) are arranged together in the partition cover (65). The shroud (6) is fixedly connected. Among the remaining fin strips (651), a connecting rod (652) is installed between two adjacent fin strips (651). The connecting rod (652) is slidably assembled in the corresponding slot (64). A first air duct (653) with an arc structure is opened at the end of the fin strip (651) near the magnetic core (2). An arc-shaped arc guide part (655) is provided on the lower side of the end of the fin strip (651) near the magnetic core (2). The lower end of the fin strip (651) is provided with a second air duct (654) that runs vertically through the bottom. The second air duct (654) has a boot-shaped structure that is narrow at the bottom and wide at the top. The overlapping area between two adjacent second air ducts (654) forms a first air duct. The overlapping area between the adjacent second air ducts (654) and the first air duct (653) forms a second air duct. As the air guide plate (61) rotates toward the direction closer to the magnetic core (2), the area of ​​the first air duct gradually increases and the area of ​​the second air duct gradually decreases. One end of the first rotating shaft (62) extends to the outside of the partition cover (6) and is fixedly sleeved with the first gear (63), which meshes with the first rack (66); one end of the second rotating shaft (81) extends to the outside of the rectangular air outlet (71) and is fixedly sleeved with the second gear (82), which meshes with the second rack (83); a movable frame (67) is installed between the first rack (66) and the second rack (83); the movable frame (67) is slidably mounted on the partition cover (6) in the horizontal direction; and a push rod (68) is fixedly connected to the movable frame (67) in a horizontal position; the push rod (68) moves linearly in the horizontal direction.

2. The composite magnetic voltage regulator according to claim 1, characterized in that: A piston (69) is installed at the end of the push rod (68), and the piston (69) is slidably sleeved in the inner cavity of the sleeve (610); the partition cover (6) has a cavity structure and is filled with thermal expansion gas, and the cavities of the sleeve (610) and the partition cover (6) are connected.

3. The composite magnetic voltage regulator according to claim 2, characterized in that: A return spring (611) is fitted on the outer circumference of the push rod (68), and one end of the return spring (611) is connected to the piston (69); both ends of the sleeve (610) are provided with through holes (612).

4. The composite magnetic voltage regulator according to claim 1, characterized in that: The interior of the outer casing (1) is provided with a second fan (10) arranged along the width direction of the partition cover (6).

5. The composite magnetic voltage regulator according to claim 1, characterized in that: An exhaust fan (9) is installed on the top of the outer casing (1), and the exhaust fan (9) is connected to the external environment.

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