A core fast fixing type transformer

Abstract

The application provides a core quick fixing type transformer, and relates to the technical field of transformers. The core quick fixing type transformer comprises a support, a core and a connecting mechanism. The connecting mechanism is connected between the core and the support and is used for positioning the core on the support. The connecting mechanism is configured to allow the core to displace relative to the connecting mechanism when the core is deformed due to thermal expansion and cold contraction, so as to release the constraint stress generated by the core due to thermal expansion and cold contraction, facilitate the release of the constraint stress generated in the process of thermal expansion and cold contraction of the core, reduce the influence of stress concentration in the core on the silicon steel sheet stacking state, and reduce the risk of an increase in no-load loss caused by gaps between the silicon steel sheets.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a transformer with a rapidly fixed iron core. Background Technology

[0002] A transformer is an electrical device used to transmit electrical energy and transform voltage. It typically consists of an iron core and windings wound around that core. Transformers transfer electrical energy between the primary and secondary sides through electromagnetic induction and can step up or step down the input voltage according to actual application requirements. Transformers can be used in power transmission and distribution systems, industrial equipment, and various electrical appliances to meet the power transmission needs at different voltage levels.

[0003] In related technologies, transformers experience increased no-load losses during operation. Increased no-load losses lead to higher operating energy consumption and may increase transformer temperature, which is detrimental to the long-term stable operation of the transformer. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a transformer with a rapidly fixed iron core.

[0005] This application provides a core-fast fixing transformer, comprising: support; Iron core; Windings, wound on the iron core; and A connecting mechanism is provided between the iron core and the bracket to position the iron core on the bracket. The connecting mechanism is configured to: allow the iron core to displace relative to the connecting mechanism when the iron core deforms due to thermal expansion, so as to release the constraint stress generated by the thermal expansion of the iron core; and suppress the contraction displacement of the iron core relative to the connecting mechanism when the iron core deforms due to cold contraction, so as to maintain the tension state of the iron core.

[0006] In some embodiments, a sliding member is also included, which is disposed between the iron core and the connecting mechanism. One side of the sliding member is in contact with the iron core, and the other side is slidably engaged with the connecting mechanism, so that the iron core can move relative to the connecting mechanism through the sliding member.

[0007] In some embodiments, the iron core extends along a first direction, which is opposite to the direction of gravity; The connecting mechanism includes a first connecting member and a second connecting member. The first connecting member is connected between one end of the iron core along the first direction and the bracket, and the second connecting member is connected between the other end of the iron core along the first direction and the bracket. The first connector is located above the second connector in the direction of gravity, and the sliding member is disposed between the first connector and the iron core.

[0008] In some embodiments, a mounting cavity is formed between the sliding member and the first connecting member, a rolling member is disposed in the mounting cavity, the sliding member has an inclined surface on the side facing the mounting cavity, the rolling member is located between the inclined surface and the first connecting member, and contacts the inclined surface and the first connecting member respectively.

[0009] In some embodiments, a wedge-shaped space for accommodating the rolling element is formed between the inclined surface and the first connector; When the iron core expands thermally along the first direction, the rolling element is able to roll within the wedge-shaped space, allowing the sliding element to move relative to the first connecting element along the first direction; When the iron core shrinks along the first direction, the rolling element is clamped by the inclined surface and the first connecting member within the wedge-shaped space to restrict the sliding element from moving relative to the first connecting member in a direction opposite to the first direction.

[0010] In some embodiments, the first connector includes a first clamping member, a second clamping member, and a locking member. The first clamping member and the second clamping member are respectively located on opposite sides of the iron core. The sliding member is respectively located between the first clamping member and the second clamping member and the iron core. The locking member connects the first clamping member and the second clamping member so that the sliding member and the iron core are clamped between the first clamping member and the second clamping member.

[0011] In some embodiments, an oil groove is provided in the mounting cavity, and an oil hole is provided in the sliding member. The oil hole communicates with the bottom of the oil groove and with the sliding engagement area between the sliding member and the first connecting member. The sliding member is in contact with and slides with the first connecting member to form a relatively closed space in the mounting cavity. The gas in the mounting cavity is adapted to generate pressure changes when the temperature changes, so that the lubricating oil in the mounting cavity enters the sliding fit area through the oil hole.

[0012] In some embodiments, the sliding member is provided with a protrusion that extends into the mounting cavity, and the oil groove is formed in the protrusion; The sliding engagement area between the sliding member and the first connecting member is located above the oil groove, and the projection of the sliding engagement area in the direction of gravity is located within the oil groove.

[0013] In some embodiments, the first connector is provided with a limiting groove that communicates with the mounting cavity, and the protrusion is at least partially located within the limiting groove to limit the sliding range of the sliding member relative to the first connector.

[0014] In some embodiments, a spring sheet is provided in the mounting cavity. One end of the spring sheet is connected to the sliding member and located in the oil groove, and the other end is a free end. The free end abuts against the rolling member so that the rolling member remains in contact with the inclined surface and the first connecting member.

[0015] The present invention has the following advantages and beneficial effects: (1) The iron core is positioned on the support by the connecting mechanism, and the connecting mechanism is configured to allow the iron core to move relative to the connecting mechanism when the iron core deforms due to thermal expansion, so as to release the constraint stress generated by the iron core due to thermal expansion, which is beneficial to reduce the gap between silicon steel sheets due to constraint stress; the connecting mechanism inhibits the shrinkage displacement of the iron core when the iron core deforms due to cold shrinkage, so that the iron core remains in a tensile state during the cold shrinkage process, which is beneficial to maintain the tightness between silicon steel sheets, reducing the possibility of loosening or gaps between silicon steel sheets after the iron core shrinks, thereby reducing the possibility of the iron core no-load loss increasing; (2) By setting a first connector and a second connector at both ends of the iron core along the first direction, and both the first connector and the second connector are connected to the bracket, the upper and lower ends of the iron core are positioned on the bracket through the connecting mechanism, forming a "tight at both ends" stress state, which is conducive to the iron core and the winding being closely fitted, reducing the air gap between the iron core and the winding, and thus helping to reduce the no-load loss of the iron core. (3) By setting an inclined surface and a rolling element between the sliding element and the first connecting element, a wedge-shaped space is formed between the inclined surface and the first connecting element. When the iron core expands thermally, the rolling element rolls towards the narrow side of the wedge-shaped space to release the thermal expansion displacement of the iron core. When the iron core contracts coldly, the rolling element is clamped by the inclined surface and the first connecting element, which inhibits the reverse movement of the sliding element, thereby suppressing the rate of contraction of the iron core. This helps to keep the iron core in a tensile state during the contraction process, which is suitable for compensating for the dimensional changes caused by the contraction of the iron core and reducing the possibility of looseness or gaps between the silicon steel sheets of the iron core. (4) By setting an oil groove and an oil hole in the mounting cavity, and by utilizing the pressure change of the gas in the mounting cavity during the temperature change process, the lubricating oil enters the sliding fit area between the sliding part and the first connecting part through the oil hole, which is beneficial to lubricate the sliding fit area and facilitates the displacement of the sliding part during the thermal expansion and contraction of the iron core; at the same time, by setting a spring to keep the rolling part in contact with the inclined surface and the first connecting part, it is beneficial to maintain the fit state of the rolling part in the wedge space, thereby taking into account both the lubrication during the sliding process and the unidirectional inhibition function of the rolling part. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the transformer.

[0018] Figure 2 This is a schematic diagram of a transformer.

[0019] Figure 3 This is a partial sectional view of the transformer.

[0020] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0021] The diagram is marked as follows: 100, bracket; 200, iron core; 300, connecting mechanism; 310, first connecting member; 311, mounting cavity; 312, first clamping member; 313, second clamping member; 314, locking member; 315, limiting groove; 320, second connecting member; 400, sliding member; 410, rolling member; 420, inclined surface; 430, oil groove; 440, oil hole; 450, protrusion; 460, spring; 500, oil drain hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] Reference Figure 1 and Figure 2 This application provides a core-fast fixing transformer. Exemplarily, the core-fast fixing transformer is applied in power transformers, distribution transformers, dry-type transformers, oil-immersed transformers, or other electrical equipment that includes a core and support fixing structure.

[0025] In some embodiments, refer to Figure 1 and Figure 2 The quick-fixing transformer for the iron core includes a bracket 100, an iron core 200, and a connecting mechanism 300. The bracket 100 supports the iron core 200 and the windings wound on the iron core 200, and the iron core 200 is positioned on the bracket 100 via the connecting mechanism 300. For example, the bracket 100 can be a clamp, base, housing, or other structural component for supporting the iron core 200, and the specific form of the bracket 100 can be selected according to the transformer's installation method and application scenario.

[0026] It should be understood that the core 200 is typically formed by stacking multiple layers of silicon steel sheets, with the sheets arranged along the stacking direction. During transformer operation, the core 200 undergoes thermal expansion and contraction due to electromagnetic losses and temperature changes, causing dimensional changes along its extension direction (i.e., the first direction). If the core 200 is rigidly fixed by the connecting mechanism 300, the deformation caused by thermal expansion and contraction will be constrained by the connecting mechanism 300, creating constraint stress within the core 200. This constraint stress, acting between the silicon steel sheets, can easily cause gaps between adjacent sheets. The appearance of these gaps increases the magnetic reluctance of the core 200, leading to an increase in no-load losses.

[0027] In some embodiments, the connecting mechanism 300 is configured to: allow the core 200 to displace relative to the connecting mechanism 300 when the core 200 deforms due to thermal expansion, thereby releasing the constraint stress generated by the thermal expansion of the core 200; and suppress the contraction displacement of the core 200 relative to the connecting mechanism 300 when the core 200 deforms due to cold contraction, thereby maintaining the tension of the core 200. Exemplarily, the connecting mechanism 300 may employ a clamping structure, a pressing structure, a plug-in structure, or other structural forms capable of positioning the core 200 on the support 100 and allowing displacement of the core 200 relative to it, while suppressing the contraction displacement when the core 200 contracts due to cold contraction.

[0028] By allowing the core 200 to shift relative to the connecting mechanism 300 during thermal expansion, the dimensional changes caused by thermal expansion of the core 200 can be absorbed by the displacement, thereby helping to release the constraint stress caused by thermal expansion of the core 200. At the same time, by suppressing the contraction displacement of the core 200 relative to the connecting mechanism 300 during cold contraction, the core 200 remains in a taut state during the cold contraction process, which helps to maintain the tightness between the silicon steel sheets of the core 200, reducing the possibility of loosening or gaps between the silicon steel sheets. This, in turn, helps to reduce the risk of increased no-load loss of the core 200 and reduce the temperature rise caused by increased no-load loss.

[0029] In some embodiments, refer to Figure 2 and Figure 3 The core-fast fixing transformer also includes a sliding member 400, which is disposed between the core 200 and the connecting mechanism 300. Exemplarily, the sliding member 400 can be a plate-shaped, block-shaped, or other shaped pad. One side of the sliding member 400 is in contact with the core 200, and the other side is in sliding engagement with the connecting mechanism 300, so that the core 200 can move relative to the connecting mechanism 300 via the sliding member 400.

[0030] It should be understood that the side of the sliding member 400 that is in contact with the iron core 200 can be kept relatively fixed to the iron core 200, for example, through friction, adhesion, or positioning structures to prevent relative movement between the sliding member 400 and the iron core 200; the side of the sliding member 400 that cooperates with the connecting mechanism 300 can slide relative to the connecting mechanism 300. By setting the sliding member 400, the relative movement between the iron core 200 and the connecting mechanism 300 is transformed into sliding between the sliding member 400 and the connecting mechanism 300, which helps to avoid damage to the silicon steel sheet caused by direct friction between the iron core 200 and the connecting mechanism 300, and at the same time allows the iron core 200 to move smoothly relative to the connecting mechanism 300 through the sliding member 400 during thermal expansion and contraction.

[0031] For example, the sliding member 400 can be made of a metallic material (such as steel plate or copper plate) or a wear-resistant non-metallic material (such as polytetrafluoroethylene, nylon, or engineering plastics); the surface of the sliding member 400 that mates with the connecting mechanism 300 can be provided with a wear-resistant coating or a lubricating layer to further reduce sliding resistance. The sliding member 400 can be an integral structure or a split structure.

[0032] In some embodiments, refer to Figure 1 and Figure 2 The iron core 200 extends along a first direction, which is opposite to the direction of gravity. That is, the iron core 200 is arranged vertically, and the first direction is vertically upward.

[0033] It should be understood that the first direction is used to define the extension direction of the core 200 and the deformation direction of thermal expansion and contraction. During transformer operation, the core 200 expands or contracts along the first direction.

[0034] In some embodiments, refer to Figure 2 and Figure 3 The connecting mechanism 300 includes a first connecting member 310 and a second connecting member 320. The first connecting member 310 is connected between one end of the iron core 200 along a first direction and the support 100, and the second connecting member 320 is connected between the other end of the iron core 200 along the first direction and the support 100. For example, the first connecting member 310 is located between the upper end of the iron core 200 and the support 100, and the second connecting member 320 is located between the lower end of the iron core 200 and the support 100. The first connecting member 310 is positioned above the second connecting member 320 in the direction of gravity.

[0035] By setting a first connector 310 and a second connector 320 at both ends in the first direction, both ends of the iron core 200 can be positioned on the bracket 100, which helps to improve the fixing stability of the iron core 200.

[0036] In some embodiments, refer to Figure 1 and Figure 2 The first connector 310 and the second connector 320 are both fixedly connected to the bracket 100. The first connector 310 and the second connector 320 are installed on the bracket 100 at intervals along the first direction, so that the two ends of the iron core 200 along the first direction are respectively anchored to the bracket 100 through the first connector 310 and the second connector 320. It should be understood that both ends of the iron core 200 along the first direction maintain a positioning relationship with the bracket 100: when the iron core 200 expands and elongates due to thermal expansion, its elongation displacement is released through a structure that allows relative displacement between the iron core 200 and the first connecting member 310 (such as a structure in which the sliding member 400 and the rolling member 410 cooperate), and the iron core 200 will not bear excessive constraint stress due to both ends being anchored; when the iron core 200 contracts due to cold, the wedging effect of the rolling member 410 inhibits the contraction displacement of the iron core 200 relative to the connecting mechanism 300, so that the iron core 200 remains in a tensioned state during the cold contraction process, thereby maintaining the positioning between the iron core 200 and the bracket 100 under the premise that both ends of the iron core 200 are anchored to the bracket 100, and maintaining a tight fit between the silicon steel sheets of the iron core 200 and between the iron core 200 and the winding.

[0037] In this embodiment, both the first connector 310 and the second connector 320 are fixedly connected to the bracket 100, and the two ends of the iron core 200 along the first direction are jointly constrained by the bracket 100. Under this structure, the iron core 200 will not loosen due to shrinkage during cold contraction, but will be kept taut by the wedging and suppressing effect of the rolling element 410. With both ends of the iron core 200 anchored to the bracket 100, a stress state similar to "tight at both ends" is formed, which is beneficial to improve the fixing strength of the iron core 200 and reduce the possibility of loosening, gaps or air gaps between the silicon steel sheets of the iron core 200 and between the iron core 200 and the winding due to loosening, thereby helping to reduce the no-load loss of the iron core 200.

[0038] Furthermore, since both ends of the iron core 200 along the first direction are anchored to the bracket 100, the vibration and impact loads on the iron core 200 can be jointly borne by the first connector 310 and the second connector 320, which helps to improve the stability and reliability of the iron core 200 fixation and reduce the vibration and noise of the iron core 200 during operation. At the same time, during assembly, it is only necessary to position and lock the two ends of the iron core 200 along the first direction to the first connector 310 and the second connector 320 respectively to complete the fixation of the iron core 200 on the bracket 100. The assembly process is simple and facilitates the rapid fixation of the iron core 200. It also eliminates the need to open through holes in the iron core 200 or use welding or other methods for fixation, which helps to maintain the integrity of the iron core 200 laminations.

[0039] In some embodiments, the sliding member 400 is disposed between the first connector 310 and the core 200. Exemplarily, a single sliding member 400 may be disposed between the core 200 and the first connector 310, or between the core 200 and the first connector 310 and between the core 200 and the second connector 320, or on opposite sides of the core 200.

[0040] By providing a sliding member 400 between the first connector 310 and the iron core 200, the iron core 200 extends upward when it expands thermally, and the sliding member 400 moves relative to the first connector 310 with the iron core 200, thereby allowing thermal expansion displacement at the upper end of the iron core 200; when the iron core 200 contracts coldly, it shortens downward, and the cooperation between the sliding member 400 and the first connector 310 can provide a certain holding effect on the iron core 200.

[0041] In some embodiments, refer to Figure 3 and Figure 4A mounting cavity 311 is formed between the sliding member 400 and the first connecting member 310. A rolling member 410 is provided in the mounting cavity 311. An inclined surface 420 is provided on the side of the sliding member 400 facing the mounting cavity 311. The rolling member 410 is located between the inclined surface 420 and the first connecting member 310, and is in contact with the inclined surface 420 and the first connecting member 310 respectively.

[0042] It should be understood that the mounting cavity 311 is formed by the sliding member 400 and the first connecting member 310 together, and the mounting cavity 311 provides a space for the rolling member 410. The inclined surface 420 is disposed on the side of the sliding member 400 facing the mounting cavity 311. The inclined surface 420 is inclined relative to the first direction, so that a wedge-shaped space is formed between the inclined surface 420 and the first connecting member 310.

[0043] For example, the rolling element 410 can be a ball, roller, needle roller, ball bearing, cylindrical roller, or other rolling element, and the rolling element 410 can be a single element. The rolling element 410 can be made of steel, ceramic, or other high-hardness wear-resistant materials.

[0044] By providing a rolling element 410 between the sliding element 400 and the first connecting element 310, the rolling element 410 can roll between the inclined surface 420 and the first connecting element 310 when the sliding element 400 moves relative to the first connecting element 310. Rolling friction replaces sliding friction, which helps to reduce the frictional resistance when the sliding element 400 moves relative to the first connecting element 310. This facilitates the movement of the core 200 relative to the connecting mechanism 300 through the sliding element 400 during thermal expansion and contraction, and also helps to reduce wear and noise caused by friction.

[0045] In some embodiments, refer to Figure 3 and Figure 4 A wedge-shaped space for accommodating the rolling element 410 is formed between the inclined surface 420 and the first connecting member 310.

[0046] It should be understood that the wedge-shaped space refers to the space formed between the inclined plane 420 and the first connecting member 310, whose cross-sectional dimensions gradually change along a first direction. For example, the first direction is the direction opposite to the direction of gravity; along the first direction, the distance between the inclined plane 420 and the first connecting member 310 gradually decreases, that is, the wedge-shaped space narrows along the first direction (see reference). Figure 4 This allows the rolling element 410 to roll along the inclined surface 420 toward the narrow side of the wedge-shaped space when the sliding element 400 moves in the first direction; the rolling element 410 is accommodated in the wedge-shaped space, and when the position of the rolling element 410 changes in the wedge-shaped space, the clamping state of the inclined surface 420 and the first connecting element 310 on the rolling element 410 changes accordingly.

[0047] In some embodiments, refer to Figure 3 and Figure 4When the core 200 thermally expands along the first direction, the rolling element 410 can roll within the wedge-shaped space to allow the sliding element 400 to move relative to the first connecting element 310 along the first direction. For example, when the core 200 thermally expands and elongates, the core 200 pushes the sliding element 400 upwards along the first direction, and the sliding element 400 tends to move relative to the first connecting element 310 along the first direction. At this time, the rolling element 410 can roll within the wedge-shaped space, keeping the frictional resistance between the sliding element 400 and the first connecting element 310 at a low level, thereby allowing the sliding element 400 to move relative to the first connecting element 310 along the first direction, and releasing the thermal expansion displacement of the core 200.

[0048] In some embodiments, when the core 200 shrinks along the first direction, the rolling element 410 is clamped by the inclined surface 420 and the first connecting element 310 within the wedge-shaped space, thereby restricting the sliding element 400 from moving relative to the first connecting element 310 in a direction opposite to the first direction. For example, when the core 200 shrinks, it tends to move in a direction opposite to the first direction (downward), and the sliding element 400 subsequently tends to move downward relative to the first connecting element 310. At this time, the rolling element 410 is clamped by the inclined surface 420 and the first connecting element 310 within the wedge-shaped space, thus inhibiting the downward movement of the sliding element 400. This makes it difficult for the sliding element 400 to move significantly downward relative to the first connecting element 310 in a short period of time, thereby inhibiting the shrinkage rate of the core 200 and helping to maintain the core 200 in a taut state during the shrinkage process.

[0049] It should be understood that the iron core 200 is always clamped and positioned by the connecting mechanism 300 during the thermal expansion and contraction process. The clamping effect of the connecting mechanism 300 on the iron core 200 is not relieved due to the contraction of the iron core 200. The restraint of the sliding member 400 by the rolling member 410 in the wedge-shaped space is only used to limit the rate and amount of the contraction displacement of the iron core 200. Under the wedge resistance of the rolling member 410, the iron core 200 can still undergo a certain amount of contraction displacement, so that the iron core 200 remains taut during the contraction process, avoiding the iron core 200 from becoming loose due to free contraction. This is conducive to maintaining the tightness between the silicon steel sheets of the iron core 200 and avoiding looseness or gaps between the silicon steel sheets.

[0050] It should be understood that the iron core 200 is formed by stacking multiple layers of silicon steel sheets, and the two ends of the iron core 200 along the first direction are anchored to the bracket 100 by the connecting mechanism 300. When the two ends of the iron core 200 along the first direction are stretched and in a taut state, the silicon steel sheets of the iron core 200 can adhere tightly to each other, similar to the state in which the strands of a rope remain tightly attached when stretched at both ends; when the two ends of the iron core 200 are no longer stretched and become loose, the silicon steel sheets of the layers are prone to loosening or gaps. Therefore, when the iron core 200 is cold-shrinking, this application uses the wedge-shaped space formed by the inclined surface 420 and the first connecting member 310 to wedge the rolling member 410, suppressing the shrinkage displacement of the iron core 200, so that the iron core 200 remains in a taut state during the cold-shrinking process, thereby maintaining the tightness between the silicon steel sheets of the iron core 200, reducing the possibility of loosening or gaps between the silicon steel sheets, and thus helping to reduce the no-load loss of the iron core 200.

[0051] With the above structure, when the core 200 expands thermally, the sliding member 400 is allowed to move relative to the first connecting member 310 to release the thermal expansion displacement. When the core 200 contracts coldly, the wedge action of the rolling member 410 suppresses the reverse movement of the sliding member 400, thereby keeping the core 200 in a taut state during the contraction process. This helps to reduce the possibility of loosening or gaps between the silicon steel sheets of the core 200 during the contraction process, and thus helps to maintain the compactness of the stacked core 200 and reduce the risk of increased no-load loss.

[0052] It should be understood that the inclination angle of the inclined plane 420, the size of the wedge-shaped space, and the size of the rolling element 410 can be set according to the deformation of the iron core 200, the clamping force requirements, and the assembly space. For example, the angle between the inclined plane 420 and the first direction can be any angle within the range of 10° to 60°, such as 10°, 15°, 20°, 30°, 45°, 60°, etc. When the inclination angle of the inclined plane 420 is small, the wedge-shaped space has a stronger suppressive effect on the rolling element 410, which is beneficial to improving the reliability of suppressing the reverse movement of the sliding element 400 during cold contraction. When the inclination angle of the inclined plane 420 is large, the rolling resistance of the rolling element 410 is small, which is beneficial to the smooth movement of the sliding element 400 during thermal expansion. The specific angle can be selected based on actual needs.

[0053] In some embodiments, refer to Figure 2 and Figure 3 The first connecting member 310 includes a first clamping member 312, a second clamping member 313, and a locking member 314. The first clamping member 312 and the second clamping member 313 are respectively located on opposite sides of the iron core 200. The sliding member 400 is respectively located between the first clamping member 312, the second clamping member 313, and the iron core 200. The locking member 314 connects the first clamping member 312 and the second clamping member 313 so that the sliding member 400 and the iron core 200 are clamped between the first clamping member 312 and the second clamping member 313.

[0054] It should be understood that the first clamping member 312 and the second clamping member 313 are respectively located on opposite sides of the iron core 200, for example, on opposite sides of the iron core 200 in the silicon steel sheet stacking direction. The two are arranged opposite each other and together clamp the iron core 200. The sliding member 400 may include two parts corresponding to the first clamping member 312 and the second clamping member 313 respectively. The sliding member 400 is located between the first clamping member 312 and the iron core 200 and between the second clamping member 313 and the iron core 200, so that both opposite sides of the iron core 200 are engaged with the clamping members through the sliding member 400.

[0055] For example, the first clamping member 312 and the second clamping member 313 can be plate-shaped clamping members, angular clamping members, slot-shaped clamping members, or other structural members that can fit and clamp the iron core 200; the first clamping member 312 and the second clamping member 313 can be an integral structure or a separate structure. The locking member 314 is used to lock the first clamping member 312 and the second clamping member 313 relative to each other. For example, the locking member 314 can be a bolt, stud, screw, buckle, pin, clamp, or other connecting member that can bring the two clamping members close to each other and keep them in a clamped state; there can be multiple locking members 314, and the multiple locking members 314 can be arranged at intervals along the extension direction of the iron core 200.

[0056] With the cooperation of the first clamping member 312, the second clamping member 313 and the locking member 314, the first connecting member 310 can clamp and fix the iron core 200 and the sliding member 400, which is conducive to keeping the sliding member 400 close to the iron core 200. At the same time, the clamping force can be adjusted by the locking degree of the locking member 314, which makes it easy to adjust the clamping force according to the specifications of the iron core 200 and the operating conditions, so that the iron core 200 can be reliably positioned and can move relative to the first connecting member 310 through the sliding member 400 when thermally expanding and contracting.

[0057] In some embodiments, the clamping fixing structure described above simplifies the fixing and assembly process of the iron core 200. For example, during assembly, the sliding member 400 and the iron core 200 can be placed between the first clamping member 312 and the second clamping member 313. Then, the locking member 314 brings the first clamping member 312 and the second clamping member 313 closer together and clamps them, thus completing the positioning and fixing of the iron core 200 on the bracket 100. This eliminates the need for through holes in the iron core 200 or welding and other fixing methods, reducing the steps and time required for fixing and assembling the iron core 200, and enabling rapid fixing of the iron core 200. Simultaneously, the locking member 314 can be a detachable connector such as a bolt, facilitating the loosening of the locking member 314 to disassemble the iron core 200 when needed, which is beneficial for the inspection and maintenance of the iron core 200. In some embodiments, the structure of the second connecting member 320 is the same as that of the first connecting member 310.

[0058] In some embodiments, refer to Figure 3 and Figure 4 An oil groove 430 is provided inside the mounting cavity 311, and an oil hole 440 is provided in the sliding member 400. The oil hole 440 is connected to the bottom of the oil groove 430 and to the sliding fit area between the sliding member 400 and the first connecting member 310. The sliding member 400 and the first connecting member 310 are in contact and sliding fit, so that the mounting cavity 311 forms a relatively closed space. The gas in the mounting cavity 311 is suitable to generate pressure changes when the temperature changes, so that the lubricating oil in the mounting cavity 311 enters the sliding fit area through the oil hole 440.

[0059] It should be understood that the sliding fit area refers to the area where the sliding member 400 and the first connecting member 310 are in contact with each other and slide relative to each other. The oil groove 430 is used to contain lubricating oil, and the oil hole 440 connects the oil groove 430 and the sliding fit area, forming a channel for lubricating oil to flow from the oil groove 430 to the sliding fit area.

[0060] It should be understood that the mounting cavity 311 is a relatively enclosed space formed by the sliding member 400 and the first connecting member 310 fitting together. Besides accommodating the rolling member 410 and the oil groove 430, the mounting cavity 311 also contains gas and lubricating oil. Because the mounting cavity 311 is relatively enclosed, when the transformer operating temperature rises, the gas inside the mounting cavity 311 expands due to heat, increasing its pressure. This pressure acts on the lubricating oil in the oil groove 430, pushing the lubricating oil through the oil hole 440 into the sliding fit area. When the temperature decreases, the gas inside the mounting cavity 311 contracts, decreasing its pressure, and the lubricating oil flows back to the oil groove 430 under gravity through the oil hole 440. Thus, with the periodic temperature changes during transformer operation, the lubricating oil can periodically or intermittently enter the sliding fit area to lubricate the sliding mating surfaces between the sliding member 400 and the first connecting member 310.

[0061] By setting up oil grooves 430 and oil holes 440, and using the air pressure changes in the mounting cavity 311 caused by temperature changes to drive the lubricating oil, the friction force of the sliding member 400 relative to the first connecting member 310 during movement can be maintained at a low level, which is beneficial to reduce friction and wear, reduce noise during sliding, and facilitate the smooth movement of the iron core 200 through the sliding member 400 when it expands and contracts with heat.

[0062] For example, the oil groove 430 may be located in the bottom region of the mounting cavity 311, and the oil hole 440 may be a through hole, a stepped hole, or other type of channel formed on the sliding member 400; the number of oil holes 440 may be one or more. The lubricating oil may be transformer oil, mineral oil, synthetic oil, or other oils suitable for transformer lubrication.

[0063] In some embodiments, refer to Figure 3 and Figure 4The sliding member 400 is provided with a protrusion 450, which extends into the mounting cavity 311, and an oil groove 430 is formed in the protrusion 450.

[0064] It should be understood that the protrusion 450 is the portion of the sliding member 400 that extends into the mounting cavity 311, and the oil groove 430 is integrally formed by the protrusion 450. That is, the oil groove 430 is part of the structure of the sliding member 400 itself, rather than a separate component independently disposed in the mounting cavity 311. Exemplarily, the protrusion 450 can be integrally formed with the sliding member 400, for example, by casting, forging, stamping, machining, etc.; the protrusion 450 can also be welded to the sliding member 400 or fixedly connected by other means, so that there is no fitting gap between the protrusion 450 and the sliding member 400.

[0065] By forming the oil groove 430 on the protrusion 450 of the sliding member 400, there is no assembly gap between the oil groove 430 and the sliding member 400. This helps to prevent the lubricating oil from leaking through the gap between the oil groove 430 and the sliding member 400, allowing the lubricating oil to be kept in the oil groove 430 and effectively pushed to the sliding mating area by air pressure, thereby improving the reliability of lubrication.

[0066] In some embodiments, refer to Figure 3 and Figure 4 The sliding engagement area between the sliding member 400 and the first connecting member 310 is located above the oil groove 430, and the projection of the sliding engagement area in the direction of gravity is located within the oil groove 430. It should be understood that since the sliding engagement area is located above the oil groove 430, lubricating oil dripping or overflowing from the sliding engagement area can fall into the oil groove 430 under the action of gravity, that is, the opening range of the oil groove 430 is directly below the sliding engagement area.

[0067] By positioning the projection of the sliding fit area in the direction of gravity within the oil groove 430, the oil droplets or oil formed due to lubrication in the sliding fit area can be effectively received by the oil groove 430. This helps reduce the loss of lubricating oil to other areas of the mounting cavity 311, allowing the lubricating oil to circulate between the sliding fit area and the oil groove 430, improving the utilization rate of the lubricating oil, and also helps maintain the cleanliness of the mounting cavity 311.

[0068] In some embodiments, refer to Figure 3 and Figure 4 The first connector 310 is provided with a limiting groove 315, which communicates with the mounting cavity 311. The protrusion 450 is at least partially located within the limiting groove 315 to limit the sliding range of the sliding member 400 relative to the first connector 310.

[0069] It should be understood that the limiting groove 315 is a groove structure provided on the first connecting member 310. The limiting groove 315 communicates with the mounting cavity 311, and the protrusion 450 extends into the limiting groove 315. When the sliding member 400 slides relative to the first connecting member 310, the protrusion 450 moves with the sliding member 400 within the limiting groove 315. When the protrusion 450 moves to the end of the limiting groove 315, the groove wall of the limiting groove 315 blocks the protrusion 450, thereby restricting the sliding member 400 from continuing to slide.

[0070] For example, the limiting groove 315 can be a strip groove, a rectangular groove or a groove of other shapes extending along the first direction; the extension length of the limiting groove 315 can be set according to the sliding range allowed by the sliding member 400.

[0071] By setting the limiting groove 315, the sliding range of the sliding member 400 relative to the first connecting member 310 is limited, which helps to prevent the sliding member 400 from sliding too much relative to the first connecting member 310 and detaching from the first connecting member 310 or interfering with other components. This helps to improve the reliability of the cooperation between the sliding member 400 and the first connecting member 310, and facilitates matching with the allowable deformation of the iron core 200.

[0072] In some embodiments, refer to Figure 3 and Figure 4 A spring piece 460 is provided in the mounting cavity 311. One end of the spring piece 460 is connected to the sliding member 400 and located in the oil groove 430, and the other end is a free end. The free end abuts against the rolling member 410 so that the rolling member 410 keeps in contact with the inclined surface 420 and the first connecting member 310.

[0073] It should be understood that the spring sheet 460 is a sheet-like element with elastic deformation capability. One end (fixed end) of the spring sheet 460 is connected to the sliding member 400, and the free end of the spring sheet 460 extends towards the rolling member 410 and abuts against the rolling member 410. In its natural state, the spring sheet 460 applies an elastic force to the rolling member 410 in the direction of the inclined surface 420 and the first connecting member 310, so that the rolling member 410 remains in contact with the inclined surface 420 and the first connecting member 310 under the action of the elastic force of the spring sheet 460.

[0074] For example, the spring sheet 460 can be a metal spring sheet, a spring plate, a leaf spring, or other sheet-like structure with elastic recovery capability; the spring sheet 460 can also be replaced by a spring, an elastic rubber block, an elastic pad, or other elastic element capable of applying elastic force to the rolling element 410. The connection between the fixed end of the spring sheet 460 and the sliding element 400 can be welding, riveting, bolting, or snap-fitting, or the spring sheet 460 and the sliding element 400 can be integrally formed.

[0075] By setting the spring plate 460, the rolling element 410 tends to maintain contact with the inclined surface 420 and the first connecting member 310 under the elastic force of the spring plate 460. This helps to prevent the rolling element 410 from detaching from the inclined surface 420 or the first connecting member 310 during the movement of the sliding member 400 and losing its fit. This allows the rolling element 410 to maintain contact with the inclined surface 420 and the first connecting member 310 during thermal expansion and contraction, thereby helping to maintain the unidirectional suppression function of the rolling element 410 in the wedge-shaped space and improving the reliability of the core 200 in adapting to thermal expansion and contraction.

[0076] In some embodiments, refer to Figure 3 and Figure 4 The spring plate 460 has an arc-shaped area that matches the shape of the rolling element 410, supporting the rolling element 410 and limiting its rolling position, allowing it to roll within the arc-shaped area. The arc-shaped area also has an oil drain hole 500, which communicates with the oil groove 430. Lubricating oil dripping onto the spring plate 460 flows into the oil groove 430 through the oil drain hole 500. When the rolling element 410 rolls within the arc-shaped area, the lubricating oil remaining there lubricates it; excess lubricating oil flows into the oil groove 430 through the oil drain hole 500. This helps maintain lubrication of the rolling element 410 while reducing oil accumulation on the spring plate 460, facilitating the return of lubricating oil to the oil groove 430 for recycling.

[0077] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A core-fast fixing transformer, characterized in that, include: Bracket (100); Iron core (200); The winding is wound on the iron core (200); as well as A connecting mechanism (300) is connected between the iron core (200) and the bracket (100) for positioning the iron core (200) on the bracket (100); The connecting mechanism (300) is configured to: allow the iron core (200) to move relative to the connecting mechanism (300) when the iron core (200) deforms due to thermal expansion, so as to release the constraint stress of the iron core (200) caused by thermal expansion; and suppress the contraction displacement of the iron core (200) relative to the connecting mechanism (300) when the iron core (200) deforms due to cold contraction, so as to maintain the tension of the iron core (200).

2. The core-fast fixing transformer according to claim 1, characterized in that, It also includes a sliding member (400), which is disposed between the iron core (200) and the connecting mechanism (300). One side of the sliding member (400) is in contact with the iron core (200), and the other side is in sliding cooperation with the connecting mechanism (300) so that the iron core (200) can move relative to the connecting mechanism (300) through the sliding member (400).

3. A core-fast fixing transformer according to claim 2, characterized in that, The iron core (200) extends along a first direction, which is opposite to the direction of gravity; The connecting mechanism (300) includes a first connecting member (310) and a second connecting member (320). The first connecting member (310) is connected between one end of the iron core (200) along the first direction and the bracket (100), and the second connecting member (320) is connected between the other end of the iron core (200) along the first direction and the bracket (100). The first connector (310) is located above the second connector (320) in the direction of gravity, and the sliding member (400) is disposed between the first connector (310) and the iron core (200).

4. A core-fast fixing transformer according to claim 3, characterized in that, A mounting cavity (311) is formed between the sliding member (400) and the first connecting member (310). A rolling member (410) is provided in the mounting cavity (311). An inclined surface (420) is provided on the side of the sliding member (400) facing the mounting cavity (311). The rolling member (410) is located between the inclined surface (420) and the first connecting member (310) and is in contact with the inclined surface (420) and the first connecting member (310) respectively.

5. A core-fast fixing transformer according to claim 4, characterized in that, A wedge-shaped space for accommodating the rolling element (410) is formed between the inclined surface (420) and the first connecting member (310); When the iron core (200) expands thermally along the first direction, the rolling element (410) is able to roll within the wedge-shaped space to allow the sliding element (400) to move relative to the first connecting element (310) along the first direction; When the iron core (200) shrinks along the first direction, the rolling element (410) is clamped by the inclined surface (420) and the first connecting element (310) in the wedge-shaped space to restrict the sliding element (400) from moving relative to the first connecting element (310) in a direction opposite to the first direction.

6. A core-fast fixing transformer according to claim 3, characterized in that, The first connector (310) includes a first clamping member (312), a second clamping member (313), and a locking member (314). The first clamping member (312) and the second clamping member (313) are respectively located on opposite sides of the iron core (200). The sliding member (400) is respectively located between the first clamping member (312) and the second clamping member (313) and the iron core (200). The locking member (314) connects the first clamping member (312) and the second clamping member (313) so that the sliding member (400) and the iron core (200) are clamped between the first clamping member (312) and the second clamping member (313).

7. A core-fast fixing transformer according to claim 4, characterized in that, An oil groove (430) is provided in the mounting cavity (311), and an oil hole (440) is provided in the sliding member (400). The oil hole (440) communicates with the bottom of the oil groove (430) and communicates with the sliding engagement area between the sliding member (400) and the first connecting member (310). The sliding member (400) is attached to and slides with the first connecting member (310) so that the mounting cavity (311) forms a relatively closed space. The gas in the mounting cavity (311) is adapted to generate pressure changes when the temperature changes so that the lubricating oil in the mounting cavity (311) enters the sliding fit area through the oil hole (440).

8. A core-fast fixing transformer according to claim 7, characterized in that, The sliding member (400) is provided with a protrusion (450) that extends into the mounting cavity (311), and the oil groove (430) is formed in the protrusion (450); The sliding engagement area between the sliding member (400) and the first connecting member (310) is located above the oil groove (430), and the projection of the sliding engagement area in the direction of gravity is located within the oil groove (430).

9. A core-fast fixing transformer according to claim 8, characterized in that, The first connector (310) is provided with a limiting groove (315), the limiting groove (315) is in communication with the mounting cavity (311), and the protrusion (450) is at least partially located in the limiting groove (315) to limit the sliding range of the sliding member (400) relative to the first connector (310).

10. A core-fast fixing transformer according to claim 8, characterized in that, A spring piece (460) is provided in the mounting cavity (311). One end of the spring piece (460) is connected to the sliding member (400) and located in the oil groove (430). The other end is a free end, which abuts against the rolling member (410) so that the rolling member (410) remains in contact with the inclined surface (420) and the first connecting member (310).

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