Heating device

Abstract

The invention provides a heating device. The heating device is used for heating insulating oil and comprises a shell with a first containing cavity and a mounting hole; the sealed gas storage structure is provided with a telescopic part, and the telescopic part synchronously stretches and retracts along with the sealed gas storage structure; the heating assembly comprises a heating resistor and a conductive assembly, and at least part of the conductive assembly is slidably arranged and connected with the telescopic part so as to synchronously move along with the telescopic part; at least part of the conductive component is in contact with the heating resistor; a first lead end of the heating resistor is electrically connected with the conductive component, a second lead end of the heating resistor is electrically connected with the power supply, and the conductive component is electrically connected with the power supply; when the sealed gas storage structure shrinks, the telescopic part drives at least part of the conductive assembly to move in the first direction, so that the total resistance value of the heating resistor connected to the power supply is reduced. The problem that in the prior art, a voltage transformer and a capacitor cannot adapt to the low-temperature environment is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage transformers, and more particularly, to a heating device. Background Art

[0002] Currently, in a low-temperature environment, the fluidity of the insulating oil in voltage transformers and capacitors is poor, which will affect the insulation performance of the above products.

[0003] However, the minimum operating temperature of voltage transformers and capacitors in the prior art is -40°C. If the temperature is lower than -40°C, insulating oil with better low-temperature performance needs to be replaced. However, no matter how good the insulating oil is, it can only meet the operating environment of -55°C, resulting in voltage transformers and capacitors being unable to adapt to low-temperature environments, which not only affects their normal use but also limits the operating temperature. Summary of the Invention

[0004] The main object of the present invention is to provide a heating device to solve the problem that voltage transformers and capacitors in the prior art cannot adapt to low-temperature environments.

[0005] To achieve the above object, the present invention provides a heating device for heating insulating oil. The heating device includes: a housing having a first accommodating cavity and an installation hole communicating with each other; a sealed gas storage structure disposed in the first accommodating cavity, the sealed gas storage structure having a telescopic portion that synchronously expands and contracts with the sealed gas storage structure; a heating assembly including a heating resistor and a conductive assembly, the heating resistor being disposed on the housing, at least a part of the conductive assembly being slidably disposed and connected to the telescopic portion to move synchronously with the telescopic portion; at least a part of the conductive assembly being in contact with the heating resistor; wherein, a first lead end of the heating resistor is electrically connected to the conductive assembly, a second lead end of the heating resistor is electrically connected to a power source, and the conductive assembly is electrically connected to the power source; when the sealed gas storage structure contracts, the telescopic portion drives at least a part of the conductive assembly to move in a first direction, so that the total resistance value of the heating resistor connected to the power source decreases, thereby increasing the heating power of the heating assembly.

[0006] Further, the sealed gas storage structure further has a fixing portion, the fixing portion is disposed opposite to the telescopic portion, and the fixing portion is fixedly connected to the wall of the first accommodating cavity.

[0007] Further, the conductive assembly includes a first conductive portion and a second conductive portion. The first conductive portion is connected to the telescopic portion to move synchronously with the telescopic portion; at least a part of the first conductive portion is in contact with the heating resistor; the second conductive portion is located at the installation hole, and the first conductive portion is slidably disposed along the extending direction of the second conductive portion; wherein, the first lead end of the heating resistor is electrically connected to the second conductive portion.

[0008] Further, the heating device further includes: an insulating connecting rod connected to the telescopic part, and the first conductive part is disposed at at least one end of the insulating connecting rod; wherein, the extending direction of the insulating connecting rod forms an angle with the first direction.

[0009] Further, the first conductive part includes: a wiring terminal sleeved on the second conductive part to slide along the second conductive part; a conductive sheet disposed on the wiring terminal and on the side of the wiring terminal away from the insulating connecting rod; wherein, the conductive sheet is used to contact the heating resistor.

[0010] Further, the wiring terminal includes: a first straight section attached to the end of the insulating connecting rod; an arc section, one end of the arc section is connected to the first straight section and sleeved on the second conductive part; a second straight section, the other end of the arc section is connected to the second straight section, and the second straight section is attached to the end of the insulating connecting rod and is located on both sides of the insulating connecting rod respectively with the first straight section; wherein, the arc section surrounds to form an installation cavity, and the contact position of the installation cavity with the second conductive part is greater than or equal to one place.

[0011] Further, the outer peripheral surface of the housing includes two first surfaces arranged oppositely, and two heating resistors are arranged on each first surface, and the two heating resistors are respectively located on both sides of the installation hole; wherein, the conductive sheet includes: a first straight sheet contacting with one heating resistor arranged in one first surface; an arc sheet attached to the arc surface of the arc section away from the insulating connecting rod, and one end of the arc sheet is connected to the first straight sheet; a second straight sheet contacting with the other heating resistor arranged in this first surface, and the other end of the arc sheet is connected to the second straight sheet; wherein, the first straight sheet and the second straight sheet are arranged in parallel with each other.

[0012] Further, there is one heating resistor and one first conductive part; or, there are multiple heating resistors, and the multiple heating resistors are connected in parallel, there are multiple first conductive parts, and the multiple first conductive parts are arranged in one-to-one correspondence with the multiple heating resistors.

[0013] Further, the heating resistor includes: a resistor base plate connected to the housing; a resistance wire wound around the resistor base plate along the extending direction of the resistor base plate.

[0014] Further, the heating device further includes: a transition connection structure disposed on the telescopic part, the transition connection structure has an installation recess, and the insulating connecting rod is inserted into the installation recess; a cover plate covering the installation recess to form a second accommodation cavity with the installation recess for accommodating at least part of the insulating connecting rod.

[0015] Applying the technical solution of the present invention, the heating device is used to heat insulating oil. The heating device includes a housing, a sealed gas storage structure and a heating component. The sealed gas storage structure is arranged in the first accommodation cavity and has a telescopic part, and the telescopic part expands and contracts synchronously with the sealed gas storage structure. The heating component includes a heating resistor and a conductive component. The heating resistor is arranged on the housing, and at least part of the conductive component is slidably arranged and connected to the telescopic part to move synchronously with the telescopic part. At least part of the conductive component is in contact with the heating resistor. Wherein, the first lead end of the heating resistor is electrically connected to the conductive component, the second lead end of the heating resistor is electrically connected to the power supply, and the conductive component is electrically connected to the power supply. In this way, the above setting makes the heating resistor a slide rheostat. The larger the total resistance value of the heating resistor connected to the power supply, the smaller the heating power of the heating component, and vice versa. If the temperature of the insulating oil is relatively low, based on the principle of thermal expansion and contraction, it will cause the gas stored in the sealed gas storage structure to contract, the overall sealed gas storage structure will contract, and then drive the telescopic part to contract. The telescopic part synchronously drives at least part of the conductive component to move in the first direction, so that the total resistance value of the heating resistor connected to the power supply is reduced, the heating power of the heating component is increased, and then the insulating oil is heated, thereby ensuring that the mutual inductor can be used normally, solving the problem that voltage mutual inductors and capacitors in the prior art cannot adapt to low-temperature environments, improving the versatility of the mutual inductor, and enabling the mutual inductor to adapt to low-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0017] Figure 1 The front view of the embodiment of the heating device according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 The A-A cross-sectional view of the heating device in

[0019] Figure 3 Shows Figure 1 The side view of the heating device in

[0020] Figure 4 Shows Figure 1 The internal structure schematic diagram of the housing and the sealed gas storage structure of the heating device in

[0021] Figure 5 Shows Figure 1 The structure schematic diagram of the first conductive part, the second conductive part, the insulating connecting rod and the transition connecting structure of the heating device in

[0022] Among them, the above-mentioned drawings include the following reference numerals:

[0023] 10. Housing; 11. First accommodation cavity; 12. Mounting hole; 13. First surface;

[0024] 20. Sealed gas storage structure; 21. Telescopic part; 22. Fixed part;

[0025] 30. Heating resistor; 31. Second lead end; 32. Resistor base plate; 33. Resistance wire;

[0026] 40. First conductive part; 41. Terminal; 411. First straight section; 412. Arc section; 413. Second straight section; 42. Conductive sheet; 421. First straight sheet; 422. Arc sheet; 423. Second straight sheet;

[0027] 50. Second conductive part;

[0028] 60. Insulating connecting rod;

[0029] 70. Transition connection structure; 71. Mounting recess;

[0030] 80. Cover plate;

[0031] 90. Support base. Detailed implementation manners

[0032] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0033] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0034] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower" are generally in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are generally the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contours of the respective components, but the above orientation terms do not limit the present invention.

[0035] In order to solve the problem that voltage transformers and capacitors in the prior art cannot adapt to low-temperature environments, the present application provides a heating device.

[0036] As Figures 1 to 5As shown in the figure, the heating device is used to heat insulating oil. The heating device includes a housing 10, a sealed gas storage structure 20, and a heating component. The housing 10 has a first accommodation cavity 11 and a mounting hole 12 that communicate with each other. The sealed gas storage structure 20 is disposed in the first accommodation cavity 11. The sealed gas storage structure 20 has a telescopic portion 21, and the telescopic portion 21 expands and contracts synchronously with the sealed gas storage structure 20. The heating component includes a heating resistor 30 and a conductive component. The heating resistor 30 is disposed on the housing 10. At least a part of the conductive component is slidably disposed and connected to the telescopic portion 21 to move synchronously with the telescopic portion 21; at least a part of the conductive component is in contact with the heating resistor 30. Among them, the first lead end of the heating resistor 30 is electrically connected to the conductive component, the second lead end 31 of the heating resistor 30 is electrically connected to a power source, and the conductive component is electrically connected to the power source. When the sealed gas storage structure 20 contracts, the telescopic portion 21 drives at least a part of the conductive component to move in the first direction, so that the total resistance value of the heating resistor 30 connected to the power source decreases, and the heating power of the heating component increases.

[0037] Applying the technical solution of this embodiment, the above setting makes the heating resistor 30 a sliding rheostat. The greater the total resistance value of the heating resistor 30 connected to the power source, the smaller the heating power of the heating component, and vice versa. If the temperature of the insulating oil is relatively low, based on the principle of thermal expansion and contraction, it will cause the gas stored in the sealed gas storage structure 20 to contract, and the overall sealed gas storage structure 20 will contract, thereby driving the telescopic portion 21 to contract. The telescopic portion 21 synchronously drives at least a part of the conductive component to move in the first direction, so that the total resistance value of the heating resistor 30 connected to the power source decreases, and the heating power of the heating component increases, thereby heating the insulating oil, and ensuring that the mutual inductor can be used normally, solving the problem that the voltage mutual inductor and capacitor in the prior art cannot adapt to low temperature environments, improving the versatility of the mutual inductor, and enabling the mutual inductor to adapt to low temperature environments.

[0038] In this embodiment, when the sealed gas storage structure 20 contracts to the left, the conductive component moves to the left. Due to the relationship of resistance parallel connection, the greater the resistance of the heating resistor 30 connected to the circuit, the smaller the total resistance value of the heating resistor 30, and the greater the heating power P of the heating component.

[0039] In this embodiment, the heating device is a mutual inductor heating device.

[0040] It should be noted that the type of the heating device is not limited to this, and it can be used in any sealed container that meets the following characteristics:

[0041] 1. Inside a sealed space;

[0042] 2. Due to the change of the volume of the medium in the space with external variables (such as temperature change, force change, etc.), it prompts the resistance value of the connected heating resistor to change, so that the medium is heated to a suitable temperature.

[0043] Optionally, the heating device is a capacitor heating device or a transformer heating device.

[0044] In this embodiment, when the temperature of the insulating oil reaches a preset temperature value, based on the principle of thermal expansion and contraction, the gas stored in the sealed gas storage structure 20 will expand, causing the overall expansion of the sealed gas storage structure 20, which in turn drives the expansion of the telescopic part 21. The telescopic part 21 synchronously drives the first conductive part 40 to move in the second direction, so that the resistance of the heating resistor 30 connected to the power supply increases, reducing the heating power of the heating component, and then realizing the intelligent adjustment of the temperature of the insulating oil. Here, the first direction is opposite to the second direction.

[0045] In this embodiment, in a low-temperature environment, the heating component is used to heat the insulating oil to ensure the normal use of the insulating oil and improve the insulation performance of the mutual inductor.

[0046] In this embodiment, the heating power of the heating component can be automatically adjusted according to the temperature of the insulating oil.

[0047] As Figure 4 shown, the sealed gas storage structure 20 further has a fixing part 22, which is arranged opposite to the telescopic part 21 and fixedly connected to the wall of the first accommodation cavity 11. In this way, the above setting of the fixing part 22 can fix the position of the sealed gas storage structure 20 in the first accommodation cavity 11 to prevent the sealed gas storage structure 20 from moving or shifting, which may affect the normal operation of the heating component.

[0048] Optionally, the sealed gas storage structure 20 is a bellows.

[0049] Optionally, the fixing part 22 is adhesively connected, welded, connected by fasteners, or threadedly connected to the wall of the first accommodation cavity 11. In this way, the above setting makes the connection method between the fixing part 22 and the first accommodation cavity 11 more diverse, meeting different usage requirements and working conditions, and also improving the processing flexibility of the staff.

[0050] As Figure 1 and Figure 2As shown, the conductive component includes a first conductive part 40 and a second conductive part 50. The first conductive part 40 is connected to the telescopic part 21 to move synchronously with the telescopic part 21. At least part of the first conductive part 40 is in contact with the heating resistor 30; the second conductive part 50 is located at the mounting hole 12, and the first conductive part 40 is slidably arranged along the extending direction of the second conductive part 50. Among them, the first lead end of the heating resistor 30 is electrically connected to the second conductive part 50. In this way, if the temperature of the insulating oil is relatively low, based on the principle of thermal expansion and contraction, the gas stored in the sealed gas storage structure 20 will contract, the overall sealed gas storage structure 20 will contract, and then drive the telescopic part 21 to contract. The telescopic part 21 synchronously drives the first conductive part 40 to move in the first direction, so that the total resistance value of the heating resistor 30 connected to the power supply decreases, and the heating power of the heating component increases.

[0051] As Figure 2 , Figure 3 and Figure 5 As shown, the heating device further includes an insulating connecting rod 60. The insulating connecting rod 60 is connected to the telescopic part 21, and the first conductive part 40 is arranged at at least one end of the insulating connecting rod 60. Among them, the extending direction of the insulating connecting rod 60 forms an angle with the first direction. Optionally, the extending direction of the insulating connecting rod 60 is perpendicular to the first direction. In this way, the above settings ensure on the one hand that the telescopic part 21 can be connected to the first conductive part 40, improving the connection stability between the two; on the other hand, it makes the disassembly and assembly of the two easier and simpler, reducing the disassembly and assembly difficulty.

[0052] In this embodiment, there are two first conductive parts 40, and the two first conductive parts 40 are respectively arranged at both ends of the insulating connecting rod 60.

[0053] As Figure 2 and Figure 5 As shown, the first conductive part 40 includes a wiring terminal 41 and a conductive sheet 42. The wiring terminal 41 is sleeved on the second conductive part 50 to slide along the second conductive part 50, and the conductive sheet 42 is arranged on the wiring terminal 41 and is located on the side of the wiring terminal 41 away from the insulating connecting rod 60. Among them, the conductive sheet 42 is used to contact the heating resistor 30. In this way, the above settings ensure on the one hand that the first conductive part 40 can be conductively connected to the second conductive part 50, and further ensure that the heating resistor 30 can operate normally, improving the operating reliability of the heating resistor 30; on the other hand, the above settings make the structure of the first conductive part 40 simpler, easier to process and implement, reducing the processing cost and processing difficulty of the first conductive part 40.

[0054] In this embodiment, the wiring terminal 41 is made of copper.

[0055] As Figure 2 and Figure 5As shown, the terminal 41 includes a first straight section 411, an arc section 412 and a second straight section 413. The first straight section 411 is attached to the end of the insulating connecting rod 60. One end of the arc section 412 is connected to the first straight section 411 and sleeved on the second conductive part 50. The other end of the arc section 412 is connected to the second straight section 413. The second straight section 413 is attached to the end of the insulating connecting rod 60 and is located on both sides of the insulating connecting rod 60 respectively with the first straight section 411. Wherein, the arc section 412 surrounds to form an installation cavity, and the contact position between the installation cavity and the second conductive part 50 is greater than or equal to one place. In this way, on the one hand, the above setting realizes the sleeving of the terminal 41 on the second conductive part 50, and the terminal 41 can slide along the extending direction of the second conductive part 50 to realize the adjustment of the resistance value of the access power supply; on the other hand, the above setting makes the structure of the terminal 41 simpler, easier to process and realize, and reduces the processing cost and processing difficulty of the terminal 41.

[0056] Specifically, the terminal 41 is connected to the insulating connecting rod 60 through the first straight section 411 and the second straight section 413, thereby increasing the contact area between the terminal 41 and the insulating connecting rod 60 and improving the connection stability between the two. The arc section 412 is in conductive contact with the second conductive part 50 to ensure that a loop can be realized inside the heating component after power-on and ensure that the heating resistor 30 can operate normally.

[0057] In this embodiment, the terminal 41 is an integrally formed structure.

[0058] As Figures 1 to 3 shown, the outer peripheral surface of the housing 10 includes two first surfaces 13 arranged oppositely. Two heating resistors 30 are arranged on each first surface 13, and the two heating resistors 30 are respectively located on both sides of the installation hole 12. Wherein, the conductive sheet 42 includes a first straight sheet 421, an arc sheet 422 and a second straight sheet 423. The first straight sheet 421 is in contact with a heating resistor 30 arranged in one first surface 13. The arc sheet 422 is attached to the arc surface of the arc section 412 far from the insulating connecting rod 60. One end of the arc sheet 422 is connected to the first straight sheet 421, the second straight sheet 423 is in contact with another heating resistor 30 arranged in this first surface 13, and the other end of the arc sheet 422 is connected to the second straight sheet 423. In this way, on the one hand, the above setting ensures that the conductive sheet 42 can be in contact with the two heating resistors 30 located in the same first surface 13 to realize the function of the sliding rheostat; on the other hand, it ensures that the conductive sheet 42 is in conductive contact with the terminal 41 to ensure that a loop can be realized inside the heating component after power-on. At the same time, the above setting makes the structure of the conductive sheet 42 simpler, easier to process and realize, and reduces the processing cost and processing difficulty of the conductive sheet 42.

[0059] In this embodiment, heating resistors 30 are provided only on two first surfaces 13 of the housing 10, so that the structure of the heating device is simpler, easier to process and implement, and the processing cost and difficulty of the heating device are reduced.

[0060] It should be noted that the setting position of the heating resistor 30 is not limited to this, and can be adjusted according to the working conditions and usage requirements. In other embodiments not shown in the drawings, the housing is a cube and its outer peripheral surface further includes two second surfaces arranged oppositely, the two second surfaces are located between the two first surfaces, and two heating resistors are also provided on each second surface.

[0061] Optionally, the first flat piece 421 and the second flat piece 423 are arranged parallel to each other. In this way, the above setting reduces the installation accuracy of the conductive piece 42, so as to ensure that as long as one flat piece contacts the heating resistor 30, the other flat piece will necessarily contact the heating resistor 30.

[0062] Optionally, there is one heating resistor 30 and one first conductive part 40; or, there are multiple heating resistors 30, and the multiple heating resistors 30 are connected in parallel, and there are multiple first conductive parts 40, and the multiple first conductive parts 40 are arranged in one-to-one correspondence with the multiple heating resistors 30. In this way, the above setting makes the selection of the number of the heating resistor 30 and the first conductive part 40 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0063] In this embodiment, there are four heating resistors 30, two heating resistors 30 are located on one first surface 13, and the other two heating resistors 30 are located on the other first surface 13, and the four heating resistors 30 are connected in parallel. There are four first conductive parts 40, and the four first conductive parts 40 are arranged in one-to-one correspondence with the four heating resistors 30. In this way, on the premise of ensuring that the heating component can heat the insulating oil, the above setting reduces the overall processing cost and difficulty of the heating device.

[0064] As Figure 2 shown, the heating resistor 30 includes a resistor base plate 32 and a resistance wire 33. Among them, the resistor base plate 32 is connected to the housing 10, and the resistance wire 33 is wound around the resistor base plate 32 along the extension direction of the resistor base plate 32. In this way, the above setting makes the structure of the heating resistor 30 simpler, easier to process and implement, and reduces the processing cost and difficulty of the heating resistor 30.

[0065] In this embodiment, the housing 10 has a through hole, and the resistor base plate 32 is arranged in the through hole and connected to the housing 10.

[0066] As Figure 2 、 Figure 3 and Figure 5As shown, the heating device further includes a transition connection structure 70 and a cover plate 80. Among them, the transition connection structure 70 is arranged on the telescopic part 21. The transition connection structure 70 has an installation recess 71, and the insulating connecting rod 60 is inserted into the installation recess 71. The cover plate 80 covers the installation recess 71 to form a second accommodation cavity for accommodating at least part of the insulating connecting rod 60 between the cover plate 80 and the installation recess 71. In this way, the above settings make the disassembly and assembly of the insulating connecting rod 60 and the telescopic part 21 easier and simpler, reducing the disassembly and assembly difficulty between the two. At the same time, after the two are assembled, the cover plate 80 covers the installation recess 71 to prevent the insulating connecting rod 60 from falling out of the installation recess 71 and affecting the assembly stability of the two.

[0067] As Figure 1 and Figure 3 As shown, the heating device further includes a support base 90. Among them, the support base 90 is arranged on the outer surface of the housing 10 and on both sides of the installation hole 12, and the second conductive part 50 is inserted through the support base 90. In this way, the above settings make the second conductive part 50 be erected on the housing 10 and have a preset gap with the housing 10, so that the first conductive part 40 can slide along it.

[0068] In this embodiment, the second conductive part 50 is a rod-shaped structure. There are two support bases 90, and the two support bases 90 respectively support both ends of the rod-shaped structure, thereby improving the connection stability between the second conductive part 50 and the housing 10.

[0069] In this embodiment, the heating resistor 30 is bonded to the outer surface of the housing 10, and the top of the heating resistor 30 protrudes slightly to facilitate contact conduction with the conductive sheet 42.

[0070] Optionally, the power supply is an external power supply or is powered by the coil of the transformer body.

[0071] Specifically, the working principle of the heating device is as follows:

[0072] When the temperature of the insulating oil decreases, the volume of the sealed gas storage structure 20 shrinks, and the telescopic part 21 drives the insulating connecting rod 60 to move to the left (the first direction), so that the first conductive part 40 moves to the left synchronously, then the resistance connected to the power supply decreases. According to Ohm's law, with the voltage unchanged, when the resistance decreases, the heating power increases, so as to heat the insulating oil through the heating component.

[0073] When the temperature of the insulating oil increases, the volume of the sealed gas storage structure 20 increases, and the telescopic part 21 drives the insulating connecting rod 60 to move to the right (the second direction). Similarly, the resistance connected to the power supply increases, and the heating power decreases. When the temperature of the insulating oil increases to a certain temperature, when the first conductive part 40 slides to the insulated part (without winding resistance wire) of the resistance sheet, the entire circuit is in an open state.

[0074] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects:

[0075] The heating device is used to heat insulating oil. The heating device includes a housing, a sealed gas storage structure, and a heating component. The sealed gas storage structure is disposed in the first accommodation cavity and has a telescopic portion, and the telescopic portion synchronously expands and contracts with the sealed gas storage structure. The heating component includes a heating resistor and a conductive component. The heating resistor is disposed on the housing, and at least a part of the conductive component is slidably disposed and connected to the telescopic portion to move synchronously with the telescopic portion. At least a part of the conductive component is in contact with the heating resistor. Wherein, the first lead end of the heating resistor is electrically connected to the conductive component, the second lead end of the heating resistor is electrically connected to the power supply, and the conductive component is electrically connected to the power supply. In this way, the above arrangement makes the heating resistor a sliding rheostat. The larger the total resistance value of the heating resistor connected to the power supply, the smaller the heating power of the heating component, and vice versa. If the temperature of the insulating oil is relatively low, based on the principle of thermal expansion and contraction, it will cause the gas stored in the sealed gas storage structure to contract, the overall sealed gas storage structure will contract, and then drive the telescopic portion to contract. The telescopic portion synchronously drives at least a part of the conductive component to move in the first direction, so that the total resistance value of the heating resistor connected to the power supply is reduced, the heating power of the heating component is increased, and then the insulating oil is heated, thereby ensuring that the mutual inductor can be used normally, solving the problem that the voltage mutual inductor and capacitor in the prior art cannot adapt to low temperature environments, improving the versatility of the mutual inductor, and enabling the mutual inductor to adapt to low temperature environments.

[0076] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0077] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0078] It should be noted that the terms "first", "second", etc. in the description, claims, and drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0079] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heating device for heating insulating oil, characterized in that, the heating device comprises: a housing (10) having a first accommodation cavity (11) and a mounting hole (12) communicating with each other; a sealed gas storage structure (20) disposed in the first accommodation cavity (11), the sealed gas storage structure (20) having a telescopic portion (21), and the telescopic portion (21) telescoping synchronously with the sealed gas storage structure (20); a heating assembly including a heating resistor (30) and a conductive assembly, the heating resistor (30) being disposed on the housing (10), at least a part of the conductive assembly being slidably disposed and connected to the telescopic portion (21) to move synchronously with the telescopic portion (21); at least a part of the conductive assembly being in contact with the heating resistor (30); wherein, a first lead end of the heating resistor (30) is electrically connected to the conductive assembly, a second lead end (31) of the heating resistor (30) is electrically connected to a power supply, and the conductive assembly is electrically connected to the power supply; when the sealed gas storage structure (20) contracts, the telescopic portion (21) drives at least a part of the conductive assembly to move in a first direction, so that the total resistance value of the heating resistor (30) connected to the power supply decreases, thereby increasing the heating power of the heating assembly.

2. The heating device according to claim 1, characterized in that, the sealed gas storage structure (20) further has a fixing portion (22), the fixing portion (22) being disposed opposite to the telescopic portion (21), and the fixing portion (22) being fixedly connected to the wall of the first accommodation cavity (11).

3. The heating device according to claim 1, characterized in that, the conductive assembly includes a first conductive portion (40) and a second conductive portion (50), the first conductive portion (40) being connected to the telescopic portion (21) to move synchronously with the telescopic portion (21); at least a part of the first conductive portion (40) being in contact with the heating resistor (30); the second conductive portion (50) being located at the mounting hole (12), and the first conductive portion (40) being slidably disposed along the extending direction of the second conductive portion (50); wherein, the first lead end of the heating resistor (30) is electrically connected to the second conductive portion (50).

4. The heating device according to claim 3, characterized in that, the heating device further comprises: an insulating connecting rod (60) connected to the telescopic portion (21), and the first conductive portion (40) being disposed at at least one end of the insulating connecting rod (60); wherein, the extending direction of the insulating connecting rod (60) is disposed at an angle with respect to the first direction.

5. The heating device according to claim 4, characterized in that, the first conductive portion (40) includes: a connection terminal (41) sleeved on the second conductive portion (50) to slide along the second conductive portion (50); a conductive sheet (42) disposed on the connection terminal (41) and located on a side of the connection terminal (41) away from the insulating connecting rod (60); Wherein, the conductive sheet (42) is used to contact the heating resistor (30).

6. The heating device according to claim 5, characterized in that the terminal (41) includes: a first straight section (411) attached to the end of the insulating connecting rod (60); a curved section (412), one end of the curved section (412) is connected to the first straight section (411) and sleeved on the second conductive part (50); a second straight section (413), the other end of the curved section (412) is connected to the second straight section (413), the second straight section (413) is attached to the end of the insulating connecting rod (60) and is located on both sides of the insulating connecting rod (60) respectively with the first straight section (411); Wherein, the curved section (412) surrounds to form a mounting cavity, and the contact position between the mounting cavity and the second conductive part (50) is greater than or equal to one place.

7. The heating device according to claim 6, characterized in that the outer peripheral surface of the housing (10) includes two first surfaces (13) arranged oppositely, two of the heating resistors (30) are arranged on each of the first surfaces (13), and the two heating resistors (30) are respectively located on both sides of the mounting hole (12); wherein, the conductive sheet (42) includes: a first flat sheet (421) in contact with one of the heating resistors (30) arranged in one of the first surfaces (13); a curved sheet (422) attached to the curved surface of the curved section (412) away from the insulating connecting rod (60), one end of the curved sheet (422) is connected to the first flat sheet (421); a second flat sheet (423) in contact with the other heating resistor (30) arranged in this first surface (13), the other end of the curved sheet (422) is connected to the second flat sheet (423); Wherein, the first flat sheet (421) and the second flat sheet (423) are arranged parallel to each other.

8. The heating device according to claim 3, characterized in that there is one heating resistor (30) and one first conductive part (40); or, there are multiple heating resistors (30), and the multiple heating resistors (30) are connected in parallel, there are multiple first conductive parts (40), and the multiple first conductive parts (40) are arranged in one-to-one correspondence with the multiple heating resistors (30).

9. The heating device according to claim 1, characterized in that the heating resistor (30) includes: a resistor base plate (32) connected to the housing (10); a resistance wire (33) wound around the resistor base plate (32) along the extending direction of the resistor base plate (32).

10. The heating device according to claim 4, characterized in that the heating device further includes: a transition connection structure (70) arranged on the telescopic part (21), the transition connection structure (70) has a mounting recess (71), and the insulating connecting rod (60) is inserted into the mounting recess (71); A cover plate (80) is provided to cover the installation recess (71), and a second accommodation cavity for accommodating at least a part of the insulating connecting rod (60) is formed by surrounding between the cover plate (80) and the installation recess (71).

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