Dry-type transformer

Abstract

The utility model discloses a dry-type transformer, belongs to the technical field of transformers, and solves the problem that the service life of the dry-type transformer is finally shortened due to the fact that the dry-type transformer which continuously keeps high temperature and continuously generates heat can only keep the dry-type transformer not to be further damaged and the structure of the dry-type transformer is still damaged due to continuous high temperature. Comprising a base frame, a plurality of iron core windings arranged on the base frame and a heat conduction sleeve which is arranged on the base frame and arranged on the iron core windings in a sleeving mode, and an air inlet assembly and an air outlet assembly which are located on the two sides of the heat conduction sleeve are arranged on the base frame respectively. The temperature sensor monitors the temperature of the heat conduction sleeve, the iron core winding is electrified to generate heat which is transmitted to the heat conduction sleeve, and when the temperature exceeds a preset value, the voltage comparison circuit notifies the controller to start the electromagnetic valve and the servo motor, push air to flow, take away heat, prevent the iron core winding from being overheated, and prolong the service life of the transformer.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a dry-type transformer. Background Art

[0002] A dry-type transformer is an electrical transformer that uses no oil as insulation or cooling medium. Instead, it relies primarily on air convection to dissipate heat. Compared to traditional oil-immersed transformers, dry-type transformers offer increased safety because they do not involve flammable materials, reducing the risk of fire and explosion. Furthermore, dry-type transformers have lower maintenance costs because they do not require the regular replacement of insulating oil required for oil-immersed transformers.

[0003] Dry-type transformers are typically used in indoor environments with high fire protection requirements, such as commercial centers, hospitals, high-rise buildings, and subway stations. They are also suitable for applications where space is limited or low noise levels are required. Dry-type transformers are typically made of resin-based insulation materials, which maintain excellent electrical and mechanical properties throughout the transformer's service life, resisting aging, shrinkage, and compression.

[0004] Conventional dry-type transformers typically use fans to slowly guide the air around them, allowing the flowing air to remove the heat generated by the dry-type transformer. However, this heat dissipation efficiency is relatively low. For dry-type transformers that maintain high temperatures and continuously generate heat, this can only prevent further damage to the dry-type transformer. The continued high temperature will still cause damage to the dry-type transformer's structure, ultimately shortening its service life.

[0005] Therefore, a dry-type transformer is proposed to solve or alleviate the above problems. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a dry-type transformer.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A dry-type transformer includes a base frame, a plurality of iron core windings arranged on the base frame, and a heat-conducting sleeve arranged on the base frame and sleeved on the iron core windings. The base frame is provided with an air inlet assembly and an air outlet assembly located on both sides of the heat-conducting sleeve, respectively. The air outlet assembly guides air from the air inlet assembly through the heat-conducting sleeve and then out of the air outlet assembly. The air flow rate in the heat-conducting sleeve is greater than the air flow rate at the air outlet of the air outlet assembly and the air inlet of the air inlet assembly.

[0009] Preferably, there is a gap between the inner ring of the heat-conducting sleeve and the outer ring of the iron core winding.

[0010] Preferably, the horizontal cross-section of the heat-conducting sleeve is olive-shaped, and the width of the gap between the inner ring of the heat-conducting sleeve and the outer ring of the core winding is gradually reduced from both ends to the middle of the heat-conducting sleeve.

[0011] Preferably, the air intake assembly includes several air intake branch pipes connected to the heat-conducting sleeve, several air intake main pipes connected to the several air intake branch pipes, air intake ducts connected to the several air intake main pipes, a reduced-end pipe connected to the air intake duct, and an air intake thick pipe connected to the reduced-end pipe. A support frame is fixedly connected to the base frame, and the air intake thick pipe is fixedly connected to the support frame.

[0012] Preferably, the gas outlet assembly includes several gas outlet branches connected to the heat-conducting sleeve, several gas outlet main pipes connected to the several gas outlet branch pipes, gas outlet ducts connected to the several gas outlet main pipes, flared pipes connected to the gas outlet ducts, and gas outlet thick pipes connected to the flared pipes.

[0013] Preferably, the air outlet assembly further includes a solenoid valve connected to the air outlet thick pipe, an air pump fixedly connected to the base frame and connected to the air outlet thick pipe, and a servo motor transmission-connected to the input end of the air pump.

[0014] Preferably, the device further includes a temperature control circuit, which includes a temperature sensor, a voltage comparison circuit, and a controller. The probe of the temperature sensor is in contact with the outer wall of the thermal sleeve. The temperature sensor collects the temperature of the thermal sleeve and outputs a temperature signal. The input end of the voltage comparison circuit is coupled to the output end of the temperature sensor. After the voltage comparison circuit responds to the temperature signal and the temperature signal is greater than a preset temperature reference signal, it outputs a comparison signal. The input end of the controller is coupled to the output end of the voltage comparison circuit. The output end of the controller is coupled to the solenoid valve and the servo motor. The controller controls the operation of the servo motor and the solenoid valve in response to the comparison signal.

[0015] The utility model has the following beneficial effects:

[0016] In the operation of the present invention, the temperature sensor is responsible for monitoring the temperature of the thermal sleeve. When the core winding of the dry-type transformer is energized, the heat generated is transferred through the gap of the thermal sleeve. The temperature sensor detects this temperature change and converts it into an electrical signal and sends it to the voltage comparison circuit. The circuit compares the received voltage with the preset reference voltage. Once it is detected that the actual voltage exceeds the reference, it indicates that the temperature has risen. At this time, the voltage comparator will send a signal to the controller. After receiving the signal, the controller will start the solenoid valve and servo motor to allow air to enter the thermal sleeve through the air intake assembly. The air flow path starts from the air intake pipe, passes through the shrinking pipe and the air intake duct, and finally enters the thermal sleeve. During this process, the support frame ensures the stability of the system. The air accelerates in the thermal sleeve, takes away the heat generated by the core winding, and then is discharged through the air outlet system. This design effectively prevents overheating of the core winding and extends the service life of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 .

[0020] 1. Base frame; 2. Heat-conducting sleeve; 3. Inlet thick pipe; 4. Support frame; 5. Reduction pipe; 6. Inlet duct; 7. Inlet main pipe; 8. Inlet branch pipe; 9. Outlet branch pipe; 10. Outlet main pipe; 11. Outlet duct; 12. Expanding pipe; 13. Outlet thick pipe; 14. Solenoid valve; 15. Vacuum pump; 16. Servo motor. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] 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 rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use, or are the orientation or position relationship commonly understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0026] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] A dry-type transformer, such as Figure 1 and Figure 2As shown, it includes a base frame 1, a plurality of iron core windings arranged on the base frame 1, and a heat-conducting sleeve 2 arranged on the base frame 1 and sleeved on the iron core windings. The base frame 1 is respectively provided with an air inlet component and an air outlet component located on both sides of the heat-conducting sleeve 2. The air outlet component guides air from the air inlet component through the heat-conducting sleeve 2 and then out of the air outlet component. The air flow rate in the heat-conducting sleeve 2 is greater than the air flow rate at the air outlet of the air outlet component and the air inlet of the air inlet component. There is a gap between the inner ring of the heat-conducting sleeve 2 and the outer ring of the iron core winding. The horizontal cross-section of the heat-conducting sleeve 2 is olive-shaped. The width of the gap between the inner ring of the heat-conducting sleeve 2 and the outer ring of the iron core winding is gradually reduced from the two ends of the heat-conducting sleeve 2 to the middle.

[0028] The air intake assembly includes several air intake branch pipes 8 connected to the heat-conducting sleeve 2, several air intake main pipes 7 connected to the several air intake branch pipes 8, an air intake duct 6 connected to the several air intake main pipes 7, a reduced end pipe 5 connected to the air intake duct 6, and an air intake thick pipe 3 connected to the reduced end pipe 5. A support frame 4 is fixedly connected to the base frame 1, and the air intake thick pipe 3 is fixedly connected to the support frame 4.

[0029] The air outlet assembly includes several air outlet branch pipes 9 connected to the heat-conducting sleeve 2, several air outlet main pipes 10 connected to the several air outlet branch pipes 9, an air outlet duct 11 connected to the several air outlet main pipes 10, an expansion pipe 12 connected to the air outlet duct 11, an air outlet thick pipe 13 connected to the expansion pipe 12, an electromagnetic valve 14 connected to the air outlet thick pipe 13, an air pump 15 fixedly connected to the base frame 1 and connected to the air outlet thick pipe 13, and a servo motor 16 transmission connected to the input end of the air pump 15.

[0030] It also includes a temperature control circuit, which includes a temperature sensor, a voltage comparison circuit, and a controller. The probe of the temperature sensor is in contact with the outer wall of the thermal sleeve 2. The temperature sensor collects the temperature of the thermal sleeve 2 and outputs a temperature signal. The input end of the voltage comparison circuit is coupled to the output end of the temperature sensor. The voltage comparison circuit responds to the temperature signal and outputs a comparison signal after the temperature signal is greater than a preset temperature reference signal. The input end of the controller is coupled to the output end of the voltage comparison circuit. The output end of the controller is coupled to the solenoid valve 14 and the servo motor 16. The controller controls the servo motor 16 and the solenoid valve 14 to operate in response to the comparison signal.

[0031] When the present invention is actually applied, the temperature of the heat-conducting sleeve 2 is detected by the temperature sensor. Only when the core winding of the dry-type transformer is energized and heated, the core winding generates heat and is transferred to the heat-conducting sleeve 2 through the gap. The temperature sensor detects the temperature on the heat-conducting sleeve 2 and outputs a temperature signal to the voltage comparison circuit. The voltage comparison circuit can compare the voltage of the temperature signal with the reference voltage of the temperature reference signal. After determining that the voltage of the temperature signal is greater than the reference voltage of the temperature reference signal, the voltage comparison circuit including the voltage comparator outputs a comparison signal to the controller. The controller can control the solenoid valve 14 to energize, thereby making the air outlet pipe 13 conductive. At the same time, the controller also controls the servo motor 16 to work. The output shaft of the servo motor 16 drives the vacuum pump 15 to work, thereby guiding the air to flow. The air enters the air intake duct 6, the air intake main pipe 7, and the air intake branch pipe 8 in this order through the air intake thick pipe 3 and the shrinking pipe 5, and then flows into the heat-conducting sleeve 2. The setting of the support frame 4 can prevent the air from shaking when it flows quickly into the shrinking pipe 5 and the air intake thick pipe 3. Since the width of the gap between the heat-conducting sleeve 2 and the iron core winding changes, the air flow can become faster and then slow down when it passes through the air outlet branch pipe 9. Finally, the hot air leaves through the air outlet main pipe 10, the air outlet duct 11, the expanding pipe 12, and the air outlet thick pipe 13 in this order, so that the fast-flowing air can quickly take away the heat generated on the iron core winding, avoiding the temperature of the iron core winding from being continuously high. Ultimately, the dry-type transformer is not easily damaged due to continuous high temperature and can maintain a longer service life.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dry-type transformer, characterized in that: The invention comprises a base frame (1), a plurality of iron core windings arranged on the base frame (1), and a heat-conducting sleeve (2) arranged on the base frame (1) and sleeved on the iron core windings. The base frame (1) is provided with an air inlet component and an air outlet component located on both sides of the heat-conducting sleeve (2). The air outlet component guides air from the air inlet component through the heat-conducting sleeve (2) and then out of the air outlet component. The air flow rate in the heat-conducting sleeve (2) is greater than the air flow rate at the air outlet of the air outlet component and the air inlet of the air inlet component.

2. A dry-type transformer according to claim 1, characterized in that: There is a gap between the inner ring of the heat-conducting sleeve (2) and the outer ring of the iron core winding.

3. A dry-type transformer according to claim 2, characterized in that: The horizontal cross-section of the heat-conducting sleeve (2) is olive-shaped, and the width of the gap between the inner ring of the heat-conducting sleeve (2) and the outer ring of the core winding is gradually reduced from the two ends of the heat-conducting sleeve (2) to the middle.

4. The dry-type transformer according to claim 1, characterized in that: The air intake assembly comprises a plurality of air intake branch pipes (8) in communication with the heat-conducting sleeve (2), a plurality of air intake main pipes (7) in communication with the plurality of air intake branch pipes (8), an air intake duct (6) in communication with the plurality of air intake main pipes (7), a constricted pipe (5) in communication with the air intake duct (6), and an air intake thick pipe (3) in communication with the constricted pipe (5); a support frame (4) is fixedly connected to the base frame (1), and the air intake thick pipe (3) is fixedly connected to the support frame (4).

5. The dry-type transformer according to claim 1, characterized in that: The gas outlet assembly comprises a plurality of gas outlet branch pipes (9) in communication with the heat-conducting sleeve (2), a plurality of gas outlet main pipes (10) in communication with the plurality of gas outlet branch pipes (9), a gas outlet conduit (11) in communication with the plurality of gas outlet main pipes (10), an expansion pipe (12) in communication with the gas outlet conduit (11), and a gas outlet thick pipe (13) in communication with the expansion pipe (12).

6. The dry-type transformer according to claim 5, characterized in that: The air outlet assembly further comprises a solenoid valve (14) connected to the air outlet thick pipe (13), an air extraction pump (15) fixedly connected to the base frame (1) and connected to the air outlet thick pipe (13), and a servo motor (16) transmission-connected to the input end of the air extraction pump (15).

7. The dry-type transformer according to claim 6, characterized in that: The invention also includes a temperature control circuit, which includes a temperature sensor, a voltage comparison circuit, and a controller. The probe of the temperature sensor contacts the outer peripheral wall of the heat-conducting sleeve (2). The temperature sensor collects the temperature of the heat-conducting sleeve (2) and outputs a temperature signal. The input end of the voltage comparison circuit is coupled to the output end of the temperature sensor. The voltage comparison circuit responds to the temperature signal and outputs a comparison signal after the temperature signal is greater than a preset temperature reference signal. The input end of the controller is coupled to the output end of the voltage comparison circuit. The output end of the controller is coupled to the electromagnetic valve (14) and the servo motor (16). The controller controls the servo motor (16) and the electromagnetic valve (14) to operate in response to the comparison signal.

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