Circulating current and eddy current low-loss dry-type transformer
By adopting a spring-pushing design with hexagonal inserts and columns and an interlocking core structure in dry-type transformers, the problems of low disassembly efficiency and high loss of cylindrical wind turbines are solved, achieving simple and efficient disassembly and assembly and reduced losses.
Patent Information
- Application Number
- CN202511013374.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-11-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional dry-type transformers have low disassembly efficiency for cylindrical impellers, and existing improvement measures are still quite troublesome and inconvenient, with high eddy current and circulating losses.
The hexagonal insert rod and hexagonal post are used for sliding installation by spring push. The design of thrust and push spring simplifies the disassembly process of the cylindrical wind turbine. The magnetic flux distribution is optimized by interlocking iron core columns and magnetic silicon steel sheets, which reduces eddy current and circulation losses.
It improves the efficiency of disassembly and assembly of the cylindrical impeller, simplifies the operation steps, reduces eddy current and circulation losses, and enhances the heat dissipation effect.
Smart Images
Figure CN120954851A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of transformer technology, and more particularly to a circulating eddy current low-loss dry-type transformer. Background Technology
[0002] Dry-type transformers are an important component of power systems and are widely used in various electrical equipment. However, traditional dry-type transformers generate eddy current losses and circulating current losses during operation, affecting overall energy efficiency.
[0003] In existing dry-type transformers, the cylindrical impellers of the cross-flow cooling fans are mostly connected to the shafts that support and rotate the cylindrical impellers via couplings at both ends. This results in numerous bolts on the two couplings needing to be loosened and rotated step by step during disassembly and cleaning of the cylindrical impellers, which is cumbersome and inconvenient, hindering the improvement of disassembly efficiency. Although some cylindrical impellers use spring-loaded pin-type plug assemblies to connect and fix them to the shaft, which can avoid the above problems and improve the disassembly efficiency to some extent, the two plug assemblies located at both ends of the cylindrical impeller still require step-by-step pulling and driving when separating them from the shaft for disassembly. This operation is still cumbersome and inconvenient, and the effect on improving the disassembly efficiency of the cylindrical impellers is limited. Summary of the Invention
[0004] In view of this, the present invention provides a circulating eddy current low-loss dry-type transformer to solve the problem of low disassembly efficiency of cylindrical wind turbines.
[0005] The technical solution proposed in this invention is: a circulating eddy current low-loss dry-type transformer, specifically including a cross-flow fan, wherein the cross-flow fan is composed of a fan housing, a cylindrical impeller rotatably disposed inside the fan housing, and a motor fixed to the outside of a short side wall of the fan housing. A long hollow shaft is fixedly installed at the center of the cylindrical impeller. A hexagonal shaft hole is opened inside the long hollow shaft. A hexagonal insert is slidably installed at the first end of the hexagonal shaft hole by means of a spring push. A long drive shaft is welded to the tail end of the hexagonal insert. A short hollow shaft is rotatably installed through a short side wall of the fan casing. A hexagonal post is slidably installed inside the short hollow shaft by means of a spring push. The first end of the hexagonal post slides out and engages with the tail end of the hexagonal shaft hole, and this first end slides out and abuts against the tail end of the long drive shaft. The spring force pushing the hexagonal insert is greater than that pushing the hexagonal post. The first end of the hexagonal insert slides out and engages with the central shaft of the motor. A sliding short shaft is welded to the tail end of the hexagonal post, and the sliding short shaft engages with the tail end plate of the short hollow shaft.
[0006] Furthermore, a positioning ring is fixedly connected inside the long hollow shaft, and a force-bearing ring is welded and fitted on the long transmission shaft. The long transmission shaft and the force-bearing ring are in a through-sliding fit. A thrust spring is compressed and fitted on the part of the long transmission shaft located between the positioning ring and the force-bearing ring. The thrust spring is a spring that pushes the hexagonal insert rod.
[0007] Furthermore, a push spring is fitted on the portion of the sliding short shaft located between the hexagonal insert and the end plate of the short hollow shaft. The push spring is a spring that pushes the hexagonal insert.
[0008] Furthermore, a filter screen retaining frame is rotatably installed on the top opening of the fan housing, and a metal filter screen is connected and covered inside the filter screen retaining frame. When the filter screen retaining frame is rotated to a horizontal position, the metal filter screen covers the top opening of the fan housing. Two mounting rods with a continuous vertical bend structure are symmetrically welded at the edges of the top two ends of the fan casing. Two rectangular positioning blocks are symmetrically rotated and installed at the top of the two mounting rods. Each rectangular positioning block has a convex sliding groove. The filter retainer frame has two extended sliding plates symmetrically welded at both ends. A long handle is welded between the first ends of the two sliding plates, and the two sliding plates slide through and engage with two convex grooves.
[0009] Furthermore, two sets of horizontal ear plates are symmetrically welded to the middle of the outer side of one long sidewall of the fan casing, and U-shaped insert frames are slidably installed on the two sets of horizontal ear plates in the form of spring push.
[0010] Furthermore, one of the long side rods of the filter screen holding frame is widened. When the filter screen holding frame is placed in a horizontal state, the top parts of the two vertical insertion shafts of the U-shaped insertion frame are inserted and connected to the part of the long side rod that protrudes into the fan housing.
[0011] Furthermore, it also includes iron core columns and iron yokes. The iron core columns are made of a row of vertical silicon steel sheets stacked together. The upper and lower ends of the row of silicon steel sheets are each spaced to form a row of slots. The iron yoke is made of a row of magnetically conductive silicon steel sheets stacked together at equal intervals. The iron core columns are arranged at equal intervals in three places, and the iron yoke is arranged symmetrically in two places. The two rows of magnetic silicon steel sheets at the two iron yokes are respectively inserted into the upper and lower slots of the three rows of silicon steel sheets at the three iron core columns.
[0012] Furthermore, an insulating sleeve, a low-voltage winding, and a high-voltage winding are sequentially nested on the iron core column. The outer side of the high-voltage winding is wrapped with a resin-coated shell, and the insulating sleeve is tightly attached to the outer side of the iron core column. Both ends of the high-voltage winding and the low-voltage winding are V-shaped, and the two inclined parts of the V-shaped structure have an inclination angle of 45° relative to the iron core column. Two clamping plates are symmetrically clamped on both sides of the iron yoke. Two lifting lugs are symmetrically welded to the top of the two clamping plates on the upper iron yoke. Two horizontal contact plates are symmetrically welded to the bottom of the two clamping plates on the lower iron yoke. Four cross-flow fans are installed, and two cross-flow fans are symmetrically fixed to the top of each horizontal contact plate. Ventilation gaps are formed between the insulating sleeve and the low-voltage winding, as well as between the low-voltage winding and the high-voltage winding. The top opening of the cross-flow fan is directly opposite the ventilation gap.
[0013] Furthermore, the cylindrical impeller is composed of two symmetrically arranged circular retaining discs and a ring of long blades welded between the outer edges of the circular retaining discs. The two ends of the long hollow shaft are welded and fixed to the inner sides of the two circular retaining discs respectively. The two ends of the hexagonal shaft hole extend to two circular retaining discs. The central rotating shaft penetrates the short side wall of the fan housing. The first ends of the central rotating shaft and the short hollow shaft are respectively in contact with the outer sides of the two circular retaining discs.
[0014] Furthermore, three equally spaced locking bolts are installed through each pair of clamps, and the locking bolts are interlocked with the iron core column and the iron yoke in a through-fitting manner. The locking bolt has two nuts screwed onto its ends, and the two nuts are in contact with the outer sides of the two clamps respectively.
[0015] The circulating eddy current low-loss dry-type transformer provided by this invention has the following beneficial effects: 1. Both the hexagonal insert rod and the hexagonal pin are slidably installed by spring pushing. The cylindrical impeller can be easily and quickly loosened by simply pulling them out from the central rotating shaft and the hexagonal shaft hole, allowing for disassembly and cleaning of the cylindrical impeller. Compared to the existing technology where the two ends of the cylindrical impeller are fixedly connected to the central rotating shaft and the short hollow shaft by couplings, this eliminates the trouble of tightening and loosening numerous bolts on the two couplings before and after disassembly and assembly of the cylindrical impeller. The operation is simple and efficient.
[0016] Second, by using the power transmission of the long drive shaft in conjunction with the rebound pushing effect of the thrust spring and the positive pushing effect of the push spring, the insertion, locking and unlocking operations of the hexagonal plug and the hexagonal pin can be driven in one go. This eliminates the trouble of having to drive the above two operations step by step, making the operation simple and time-saving, and helping to improve the disassembly and assembly efficiency of the cylindrical wind turbine.
[0017] 3. When the filter screen retainer frame is swung upwards and upright, the metal filter screen is flipped towards the resin-coated shell. At this time, a large gap is formed between the metal filter screen and the resin-coated shell. This large gap provides operating space for the hands to clean the dust that has accumulated on the inside of the metal filter screen. With this large and relatively open operating space, the dust on the inside of the metal filter screen can be cleaned easily and thoroughly.
[0018] Fourth, the two yokes can connect and conduct the three core columns, forming a closed magnetic flux loop. The two rows of magnetically conductive silicon steel sheets are staggered with the three rows of vertical silicon steel sheets. The staggered connection can further optimize the distribution of magnetic flux in the closed loop and reduce magnetic flux leakage. The two ends of the high-voltage winding and the low-voltage winding are both V-shaped. The two inclined parts of the V-shaped structure have an inclination angle of 45° relative to the core column. This 45° inclination angle makes the winding angle of the winding on the inclined part of the V-shaped structure 45° relative to the core column. When the winding angle of the winding is 45°, the eddy current loss and circulating current loss of the transformer can be significantly reduced. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.
[0020] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.
[0021] In the attached diagram: Figure 1 A schematic diagram of the overall structure of the present invention is shown; Figure 2 This is a schematic diagram of the overall bottom side view of the present invention; Figure 3 A half-section internal structure diagram of the high-voltage winding and the low-voltage winding in this invention is shown. Figure 4 The present invention is shown Figure 3 Enlarged structural diagram of section D in the middle; Figure 5 The diagram shows the structural schematics of the high-voltage winding and the low-voltage winding in this invention; Figure 6 A schematic diagram showing the disassembly and separation state of the yoke and the core column in this invention is shown; Figure 7 A schematic diagram of the horizontally placed contact plate structure in this invention is shown; Figure 8 A schematic diagram of the horizontally closed state of the metal filter screen in this invention is shown; Figure 9 A bottom-view schematic diagram of the fan housing in this invention is shown; Figure 10 The present invention is shown Figure 9 Enlarged structural diagram of section A; Figure 11 This diagram illustrates the swinging and upright state of the filter holding frame in this invention. Figure 12 A schematic diagram showing the disassembly state of the rectangular positioning block in this invention is provided. Figure 13 A schematic diagram of the half-section internal structure of the fan casing in this invention is shown; Figure 14 A schematic diagram showing the installation position of the long hollow shaft in this invention is provided. Figure 15 A schematic diagram of the internal structure of the cylindrical wind turbine in this invention is shown in half section. Figure 16 The present invention is shown Figure 15 Enlarged structural diagram of section B; Figure 17 The present invention is shown Figure 15 Enlarged structural diagram of section C; Figure 18 A schematic diagram of the transmission shaft in this invention is shown; Figure 19 A schematic diagram of the central rotating shaft in this invention is shown.
[0022] List of reference numerals in the attached diagram: 1. Iron core post; 101. Insulating sleeve; 2. Iron yoke; 3. Resin-coated shell; 4. High-voltage winding; 5. Low-voltage winding; 6. Clamping plate; 601. Locking bolt; 602. Nut; 603. Horizontal contact plate; 7. Cross-flow fan; 701. Fan housing; 7011. Horizontal ear plate; 702. Cylindrical impeller; 7021. Circular retaining disc; 7022. Long strip blades; 7023. Long hollow shaft; 7024. Hexagonal insert rod; 7025. Drive shaft; 7026. Positioning ring; 7027. Force ring; 7028. Thrust spring; 7029. Hexagonal shaft hole; 703. Motor; 7031. Central rotating shaft; 704. U-shaped insert frame; 7041. Retaining ring; 705. Filter screen retaining frame; 7051. Metal filter screen; 7052. Slide plate; 7053. Long strip handle plate; 706. Mounting rod; 7061. Rectangular positioning block; 707. Short hollow shaft; 7071. Hexagonal insert post; 7072. Sliding short shaft; 7073. Push spring. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0024] Please refer to Figures 1 to 19 Example 1: This embodiment proposes a circulating eddy current low-loss dry-type transformer, including a cross-flow fan 7. The cross-flow fan 7 is composed of a fan housing 701, a cylindrical impeller 702 rotatably disposed inside the fan housing 701, and a motor 703 fixed to the outside of a short side wall of the fan housing 701. A long hollow shaft 7023 is fixedly installed at the center of the cylindrical impeller 702. A hexagonal shaft hole 7029 is opened inside the long hollow shaft 7023. A hexagonal insert 7024 is slidably installed at the first end of the hexagonal shaft hole 7029 by means of a spring push. A long drive shaft 7025 is welded to the tail end of the hexagonal insert 7024. A short hollow shaft 707 is rotatably installed through a short side wall of the fan housing 701. A hexagonal insert 7071 is slidably installed inside the short hollow shaft 707 by means of a spring push. The first end of the sliding part of 1 is inserted into the tail end of the hexagonal shaft hole 7029, and the first end of the sliding part is in contact with the tail end of the transmission long shaft 7025; the spring force of the spring that pushes the hexagonal plug 7024 is greater than the spring that pushes the hexagonal plug 7071; the first end of the sliding part of the hexagonal plug 7024 is inserted into the central rotating shaft 7031 of the motor 703; a sliding short shaft 7072 is welded to the tail end of the hexagonal plug 7071, and the sliding short shaft 7072 is slidably connected to the tail end blocking plate of the short hollow shaft 707.
[0025] Preferably, a positioning ring 7026 is fixedly connected inside the long hollow shaft 7023, and a force-bearing ring 7027 is welded and fitted on the long transmission shaft 7025. The long transmission shaft 7025 and the force-bearing ring 7027 are in a through-sliding fit. A thrust spring 7028 is compressed and fitted on the part of the long transmission shaft 7025 located between the positioning ring 7026 and the force-bearing ring 7027. The thrust spring 7028 is a spring that pushes the hexagonal insert 7024.
[0026] Preferably, a push spring 7073 is compressed and fitted on the portion of the sliding short shaft 7072 located between the hexagonal insert 7071 and the end plate of the short hollow shaft 707, and the thrust spring 7028 is a spring that pushes the hexagonal insert 7071.
[0027] Preferably, a filter holding frame 705 is rotatably mounted on the top opening of the fan housing 701. A metal filter 7051 is connected and covered inside the filter holding frame 705. When the filter holding frame 705 is rotated to a horizontal position, the metal filter 7051 covers the top opening of the fan housing 701. Two mounting rods 706 with a continuous vertical bend structure are symmetrically welded to the edges of the top two ends of the fan housing 701. Two rectangular positioning blocks 7061 are symmetrically rotatably mounted on the top parts of the two mounting rods 706. Each of the two rectangular positioning blocks 7061 has a convex sliding groove. Two extended sliding plates 7052 are symmetrically welded to both ends of the filter holding frame 705. A long strip plate 7053 is welded between the first ends of the two sliding plates 7052. The two sliding plates 7052 slide through and engage with the two convex sliding grooves.
[0028] Preferably, two sets of horizontal ear plates 7011 are symmetrically welded to the middle of the outer side of a long sidewall of the fan housing 701. A U-shaped insert frame 704 is slidably installed on the two sets of horizontal ear plates 7011 in the form of spring push. Each set of horizontal ear plates 7011 is composed of two horizontal ear plates 7011 arranged vertically and vertically. Two vertical insert shafts of the U-shaped insert frame 704 are respectively slidably engaged with the two sets of horizontal ear plates 7011. A retaining ring 7041 is welded and fitted on the vertical insert shaft. A spring is compressed and fitted on the part of the vertical insert shaft between the retaining ring 7041 and the upper horizontal ear plate 7011. The spring is a spring that pushes the U-shaped insert frame 704.
[0029] Preferably, one of the long side bars of the filter holding frame 705 is widened. When the filter holding frame 705 is placed in a horizontal state, the top parts of the two vertical insertion shafts of the U-shaped insertion frame 704 are inserted and connected to the part of the long side bar that protrudes into the fan housing 701.
[0030] Preferably, the cylindrical impeller 702 is composed of two symmetrically arranged circular retaining discs 7021 and a ring of elongated blades 7022 welded between the outer edges of the circular retaining discs 7021. The two ends of the long hollow shaft 7023 are welded and fixed to the inner sides of the two circular retaining discs 7021 respectively. The two ends of the hexagonal shaft hole 7029 extend to the two circular retaining discs 7021. The central rotating shaft 7031 penetrates the short sidewall of the fan housing 701. The first ends of the central rotating shaft 7031 and the short hollow shaft 707 respectively abut against the outer sides of the two circular retaining discs 7021.
[0031] Implementation 2: This embodiment is based on Implementation 1, but with the following additions: The core column 1 is made of a row of vertically stacked silicon steel sheets, with slots formed at intervals at both ends of the stacked silicon steel sheets. The yoke 2 is made of a row of magnetically conductive silicon steel sheets stacked at equal intervals. There are three such magnetically conductive silicon steel sheets on the core column 1, and two such magnetically conductive silicon steel sheets on the yoke 2. The two rows of magnetically conductive silicon steel sheets on the two yoke 2 locations are respectively inserted into the upper and lower slots of the three rows of silicon steel sheets on the core column 1. An insulating sleeve 101 is fitted onto the core column 1 in an inner-outer nesting manner. The system includes a low-voltage winding 5 and a high-voltage winding 4. The high-voltage winding 4 is wrapped with a resin-coated shell 3, and the insulating sleeve 101 is tightly attached to the outside of the iron core column 1. Two clamping plates 6 are symmetrically clamped on both sides of the iron yoke 2. Two lifting lugs are symmetrically welded to the top of the two clamping plates 6 on the upper iron yoke 2, and two horizontal contact plates 603 are symmetrically welded to the bottom of the two clamping plates 6 on the lower iron yoke 2. Four cross-flow fans 7 are provided, and two cross-flow fans 7 are symmetrically fixedly installed at the top of each horizontal contact plate 603.
[0032] Preferably, ventilation gaps are formed between the insulating sleeve 101 and the low-voltage winding 5, as well as between the low-voltage winding 5 and the high-voltage winding 4, and the top opening of the cross-flow fan 7 is directly opposite the ventilation gap.
[0033] Preferably, three locking bolts 601 are installed through each pair of clamping plates 6 at equal intervals. The locking bolts 601 are interlocked with the iron core column 1 and the iron yoke 2. Two nuts 602 are screwed onto both ends of the locking bolts 601. The two nuts 602 are pressed against the outer side of the two clamping plates 6 respectively.
[0034] The following section provides a detailed explanation of the working principles, specific details, implementation steps, functions and interrelationships of each feature, and their roles in realizing this technical solution: When the hexagonal insert 7071 and the hexagonal rod 7024 are respectively inserted into the tail end of the hexagonal shaft hole 7029 and the central rotating shaft 7031, the cylindrical impeller 702 can be inserted and positioned between the central rotating shaft 7031 and the short hollow shaft 707, and the cylindrical impeller 702 can be connected to the motor 703 for transmission. Both the hexagonal rod 7024 and the hexagonal insert 7071 are slidably installed by spring pushing, and only need to be respectively connected to the central rotating shaft. The cylindrical impeller 702 can be easily and quickly loosened by removing 7031 and the hexagonal shaft hole 7029, allowing for disassembly and cleaning of the cylindrical impeller 702. Compared to the existing technology where the two ends of the cylindrical impeller 702 are fixedly connected to the central rotating shaft 7031 and the short hollow shaft 707 respectively by couplings, this eliminates the trouble of tightening and loosening numerous bolts on the two couplings before and after disassembling and assembling the cylindrical impeller 702, making the operation simple and efficient.
[0035] The hexagonal insert 7071 is held in a position where it is engaged with the hexagonal shaft hole 7029 by being pushed by the push spring 7073. Since the spring force of the push spring 7073 is greater than that of the thrust spring 7028, when the hexagonal insert 7071 is pushed into the tail end of the hexagonal shaft hole 7029 by the push spring 7073, the hexagonal insert 7071 can push and drive the transmission shaft 7025 to compress the thrust spring 7028 and slide towards the motor 703. The transmission shaft 7025 also drives the hexagonal rod 7024 to slide in the same direction, controlling the head end of the hexagonal rod 7024 to engage with the central rotating shaft 7031. The hexagonal insert 7071 and the hexagonal shaft hole 7029 can be withdrawn by sliding the short shaft 7072. When the hexagonal insert 7071 is driven to withdraw, it compresses the push spring. 7073 releases the top-pressing holding force of the push spring 7073 acting on the thrust spring 7028 through the transmission long shaft 7025. At this time, the compressed thrust spring 7028 can automatically push back to drive the transmission long shaft 7025 and the hexagonal plug 7024 away from the motor 703 and control the hexagonal plug 7024 to be pulled away from the central rotating shaft 7031. Then, through the power transmission of the transmission long shaft 7025 and in conjunction with the rebound pushing effect of the thrust spring 7028 and the positive pushing effect of the push spring 7073, the insertion and locking and unlocking operations of the hexagonal plug 7024 and the hexagonal plug 7071 can be driven and implemented at one time. This can save the trouble of driving and implementing the above two operations step by step, making the operation simple and time-saving, and helping to improve the disassembly and assembly efficiency of the cylindrical impeller 702.
[0036] When the top parts of the two vertical insertion shafts of the U-shaped insert frame 704 are inserted and connected to the widened long side rod of the filter screen holding frame 705, the filter screen holding frame 705 can be inserted and positioned in a state of horizontal contact with the top opening of the fan housing 701. In this state, the metal filter screen 7051 is horizontally covered by the top opening, and the metal filter screen 7051 can intercept and filter impurities in the outside air, preventing excessive dust accumulation inside the fan housing 701 and on the cylindrical impeller 702. The filter screen holding frame 705 is slidably installed on the top parts of the two sliding plates 7052 and two rectangular positioning blocks 7061. The filter screen holding frame 705 can slide along the two rectangular positioning blocks 7061 towards or away from the clamping plate 6 on the lower side. The filter screen holding frame 705 is rotatably installed on the top parts of the two mounting rods 706 through the two rectangular positioning blocks 7061, and it can swing up and down around the two top parts. When the filter screen holding frame 705 swings upward and stands upright (refer to...), Figure 11 The metal filter 7051 is flipped to face the resin-coated shell 3, at which point a large gap is formed between the metal filter 7051 and the resin-coated shell 3. This large gap provides operating space for the hand to clean the dust stuck and accumulated on the inside of the metal filter 7051. With this large and relatively open operating space, the dust on the inside of the metal filter 7051 can be cleaned easily and thoroughly.
[0037] When the U-shaped insert frame 704 and the filter screen holding frame 705 slide off, the filter screen holding frame 705 can be released. When cleaning the metal filter screen 7051, first release the filter screen holding frame 705, and then slide the filter screen holding frame 705 away from the lower clamping plate 6. When the filter screen holding frame 705 is pulled out from the space below the resin-coated shell 3, swing the filter screen holding frame 705 upward to flip it into an upright position for cleaning. In the above process, the upward swinging operation when the filter screen holding frame 705 is pulled out from the space below the resin-coated shell 3 can avoid the resin-coated shell 3 from blocking or interfering with the upward movement of the filter screen holding frame 705. Therefore, the sliding installation design of the filter screen holding frame 705 can ensure the normal and effective implementation of the upward movement of the filter screen holding frame 705.
[0038] When the cylindrical impeller 702 is driven by the high-speed rotation of the motor 703, it generates a blowing cooling airflow inside the fan housing 701. The generated blowing cooling airflow is blown upward through the top port of the fan housing 701. The blown cooling airflow flows into the ventilation gap between the insulating sleeve 101 and the low-voltage winding 5 and between the low-voltage winding 5 and the high-voltage winding 4, and carries away the heat of the low-voltage winding 5, the high-voltage winding 4 and the iron core column 1 through the flow in the gap, thereby cooling down the three components.
[0039] The two iron yokes 2 can connect and conduct the three iron core columns 1 and form a closed magnetic flux loop with the three iron core columns 1. The two rows of magnetically conductive silicon steel sheets are staggered and inserted with the three rows of vertical silicon steel sheets. The staggered connection can further optimize the magnetic flux distribution and reduce magnetic flux leakage.
[0040] Both ends of the high-voltage winding 4 and the low-voltage winding 5 are V-shaped structures. The two inclined parts of the V-shaped structure have an inclination angle of 45° relative to the iron core column 1. This 45° inclination angle makes the winding angle of the winding on the inclined part of the V-shaped structure 45° relative to the iron core column 1. When the winding angle of the winding is 45°, the eddy current loss and circulating current loss of the transformer can be significantly reduced (this conclusion is obtained by simulation through finite element analysis software).
[0041] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.
[0042] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.
[0043] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A circulating eddy current low-loss dry-type transformer, comprising a cross-flow fan (7), wherein the cross-flow fan (7) is composed of a fan housing (701), a cylindrical impeller (702) rotatably disposed inside the fan housing (701), and a motor (703) fixed to the outside of a short side wall of the fan housing (701); Its features are, A long hollow shaft (7023) is fixedly installed at the center of the cylindrical impeller (702). A hexagonal shaft hole (7029) is opened inside the long hollow shaft (7023). A hexagonal insert (7024) is slidably installed at the head end of the hexagonal shaft hole (7029) by a spring push. A long drive shaft (7025) is welded to the tail end of the hexagonal insert (7024). A short hollow shaft (707) is rotatably installed through a short side wall of the fan housing (701). A hexagonal insert (7071) is slidably installed inside the short hollow shaft (707) by a spring push. The hexagonal insert (7071)... The first end of 71) slides out and is inserted into the tail end of the hexagonal shaft hole (7029), and the first end slides out and is in contact with the tail end of the transmission long shaft (7025); the spring force of the spring that pushes the hexagonal plug (7024) is greater than the spring that pushes the hexagonal plug (7071); the first end of the hexagonal plug (7024) slides out and is inserted into the central rotating shaft (7031) of the motor (703); a sliding short shaft (7072) is welded to the tail end of the hexagonal plug (7071), and the sliding short shaft (7072) slides through the tail end plug plate of the short hollow shaft (707).
2. The circulating eddy current low-loss dry-type transformer according to claim 1, characterized in that, The long hollow shaft (7023) is internally fixed with a positioning ring (7026), and a force-bearing ring (7027) is welded and fitted on the long transmission shaft (7025). The long transmission shaft (7025) and the force-bearing ring (7027) are in a through-sliding fit. A thrust spring (7028) is compressed and fitted on the part of the long transmission shaft (7025) between the positioning ring (7026) and the force-bearing ring (7027). The thrust spring (7028) is a spring that pushes the hexagonal insert (7024).
3. The circulating eddy current low-loss dry-type transformer according to claim 1, characterized in that, The sliding short shaft (7072) is partially compressed between the hexagonal insert (7071) and the end plate of the short hollow shaft (707), and a push spring (7073) is installed. The push spring (7028) is a spring that pushes the hexagonal insert (7071).
4. A circulating eddy current low-loss dry-type transformer according to claim 1, characterized in that, A filter holding frame (705) is rotatably mounted on the top opening of the fan housing (701). A metal filter (7051) is connected and covered inside the filter holding frame (705). When the filter holding frame (705) is rotated to a horizontal position, the metal filter (7051) covers the top opening of the fan housing (701). Two mounting rods (706) with a continuous vertical bend structure are symmetrically welded at the edges of the top two ends of the fan housing (701). Two rectangular positioning blocks (7061) are symmetrically rotated at the top of the two mounting rods (706). A convex sliding groove is opened on both rectangular positioning blocks (7061). Two extended sliding plates (7052) are symmetrically welded to both ends of the filter screen retaining frame (705). A long strip plate (7053) is welded between the head ends of the two sliding plates (7052). The two sliding plates (7052) are in sliding fit with the two convex sliding grooves.
5. A circulating eddy current low-loss dry-type transformer according to claim 4, characterized in that, Two sets of horizontal ear plates (7011) are symmetrically welded to the middle position of the outer side wall of one long side wall of the fan housing (701). A U-shaped insert frame (704) is slidably installed on the two sets of horizontal ear plates (7011) in the form of spring push.
6. A circulating eddy current low-loss dry-type transformer according to claim 5, characterized in that, The filter holding frame (705) has a widened long side rod. When the filter holding frame (705) is placed in a horizontal state, the top part of the two vertical insertion shafts of the U-shaped insertion frame (704) is inserted and connected to the part of the long side rod that protrudes into the fan housing (701).
7. A circulating eddy current low-loss dry-type transformer according to claim 1, characterized in that, It also includes a core column (1) and a yoke (2). The core column (1) is made of a row of vertical silicon steel sheets stacked together. The upper and lower ends of the row of silicon steel sheets are each spaced to form a row of slots. The yoke (2) is made of a row of magnetically conductive silicon steel sheets stacked together at equal intervals. The core column (1) is set at three equal intervals, and the yoke (2) is set at two symmetrical locations. The two rows of magnetic silicon steel sheets of the two iron yokes (2) are respectively connected to the upper and lower slots of the three rows of silicon steel sheets of the three iron core columns (1).
8. A circulating eddy current low-loss dry-type transformer according to claim 7, characterized in that, The core post (1) is fitted with an insulating sleeve (101), a low-voltage winding (5) and a high-voltage winding (4) in an inner and outer nested manner. The high-voltage winding (4) is wrapped with a resin-coated shell (3) on the outside. The insulating sleeve (101) is in close contact with the outside of the core post (1). The two ends of the high-voltage winding (4) and the low-voltage winding (5) are both V-shaped structures. The two inclined parts of the V-shaped structure have an inclination angle of 45° relative to the core post (1). Two clamping plates (6) are symmetrically clamped on both sides of the iron yoke (2). Two lifting lugs are symmetrically welded to the top of the two clamping plates (6) on the upper iron yoke (2). Two horizontal contact plates (603) are symmetrically welded to the bottom of the two clamping plates (6) on the lower iron yoke (2). The cross-flow fan (7) is provided in four places. Two cross-flow fans (7) are symmetrically fixedly installed at the top of each horizontal contact plate (603). Ventilation gaps are formed between the insulating sleeve (101) and the low-voltage winding (5), as well as between the low-voltage winding (5) and the high-voltage winding (4). The top opening of the cross-flow fan (7) is directly opposite the ventilation gap.
9. A circulating eddy current low-loss dry-type transformer according to claim 1, characterized in that, The cylindrical impeller (702) is composed of two symmetrically arranged circular retaining discs (7021) and a ring of long strip blades (7022) welded between the outer edges of the circular retaining discs (7021). The two ends of the long hollow shaft (7023) are welded and fixed to the inner sides of the two circular retaining discs (7021). The two ends of the hexagonal shaft hole (7029) extend to two circular retaining discs (7021), the central rotating shaft (7031) penetrates the short side wall of the fan housing (701), and the first ends of the central rotating shaft (7031) and the short hollow shaft (707) respectively abut against the outer side of the two circular retaining discs (7021).
10. A circulating eddy current low-loss dry-type transformer according to claim 8, characterized in that, Three locking bolts (601) are installed at equal intervals on each pair of clamping plates (6). The locking bolts (601) are interlocked with the iron core column (1) and the iron yoke (2). The locking bolt (601) has two nuts (602) screwed on at both ends, and the two nuts (602) press against the outer side of the two clamps (6) respectively.