CN206040385U - A wound core structure of locomotive traction transformer - Google Patents

Abstract

A coiled iron core structure of a locomotive traction transformer, the utility model relates to a coiled iron core structure. At present, the laminated core structure transformer has high loss, high noise, low overload, frequent short circuit, and heavy weight. The utility model includes an iron core frame, binding straps, four clips, and a fastening device. The iron core frame is a single-phase two-column coiled iron core structure formed by winding silicon steel sheet strips; the upper and lower iron yokes of the iron core frame The position is equipped with supporting pads matching its cross-sectional shape; the front and rear surfaces and the left and right surfaces of the left and right iron core columns of the iron core frame are pasted with support plates, and the joint surface of the support plates and the iron core is provided with oil flow channels. An insulating partition is provided between the iron yoke and the clip; the binding straps include a large binding strap binding the iron core column and a small binding strap bound on the supporting pad, and the large binding strap binds the support plate and the iron core column. The technical solution improves the stability and reliability of the structure, reduces the weight of the transformer, has low no-load loss and no-load, low noise, good energy-saving effect, and simple manufacturing process.

Description

A wound core structure of locomotive traction transformer

technical field

The utility model relates to a wound iron core structure, in particular to a wound iron core structure of a locomotive traction transformer.

Background technique

With the rapid development of my country's electrified railways in recent years, the number and capacity of locomotive traction transformers are increasing. Although the efficiency of locomotive traction transformers is high, the traction load rate of my country's electrified railways is not high. The equivalent average of a single transformer is The load rate is only between 35% and 45%, and the no-load loss problem of locomotive traction transformer is highlighted. The no-load loss in the transformer loss comes from the core loss, which mainly occurs in the transformer core laminations. The loss caused by the hysteresis and eddy current generated by the alternating magnetic lines of force passing through the core.

In the past, the iron core of the locomotive traction transformer used a laminated core structure. From the structural point of view, due to the particularity of the operating conditions of the locomotive traction transformer, the structure of the transformer itself must be able to meet the acceleration and vibration shock when the locomotive starts, stops, and accelerates and decelerates. In order to increase The stability of the stacked iron core structure generally uses tie rods at the upper and lower iron yokes of the iron core to prevent the misalignment between each layer of silicon steel sheets. This structure can certainly meet the operating requirements of existing locomotive transformers, but its iron core After all, it is not a whole. Frequent vibration and impact will inevitably cause air gaps between the silicon steel sheets, and the opening of the iron yoke through the screw will inevitably increase the eddy current loss of the iron core; from the aspect of manufacturing technology, the stacked iron core structure The manufacturing process is complicated, and the iron core laminations are manually stacked one by one, which is greatly affected by the operator's operation skills, and coil assembly and iron yoke insertion are required. The production process is complicated and the production cycle is long; from the iron core In terms of weight, the laminated iron core is relatively heavy, and in order to increase the stability of the iron core lamination, some fixing devices will be added, which will increase the overall weight of the transformer. Due to the above stacked core structure, manufacturing process and other factors, the transformer has large no-load loss, large no-load current, high noise, high weight, and poor core stability. It is difficult for a transformer with a stacked core structure to meet the low loss, Low noise, high overload, frequent short circuit, light weight and other special requirements.

Utility model content

The technical problem to be solved and the technical task proposed by the utility model are to perfect and improve the existing technical solutions, provide a coiled iron core structure of a locomotive traction transformer, and aim at improving structural reliability and reducing no-load loss. For this reason, the utility model takes the following technical solutions.

A coiled iron core structure of a locomotive traction transformer, including an iron core frame, a binding strap for binding the iron core frame, four clips for clamping the upper and lower iron yokes of the iron core, and a fixing clip and the iron core frame The fastening device, the iron core frame is a single-phase two-column coiled iron core structure formed by winding silicon steel sheet strips; the upper and lower iron yoke positions of the iron core frame are provided with supporting pads matching its cross-sectional shape; The front and rear surfaces and the left and right surfaces of the left and right iron core columns of the core frame are provided with support plates, and the joint surface of the support plates and the iron core is provided with an oil flow channel, and an insulating partition is provided between the iron yoke and the clamp of the iron core frame; The binding straps include a large binding strap for binding the iron core column and a small binding strap for binding the support pad, and the large binding strap binds the support plate and the iron core column. By adopting the coiled core structure to replace the stacked core structure of the traditional locomotive traction transformer, the traditional stacked core rods are eliminated, the structural stability and reliability of the core are enhanced, and the weight of the core is reduced. The magnetic flux distribution and temperature distribution of the core are more uniform, there is no air gap in the entire magnetic circuit, the magnetic resistance is small, and the no-load loss and no-load current are lower than those of conventional laminated core transformers.

As a further improvement and supplement to the above technical solution, the utility model also includes the following additional technical features.

The upper and lower iron yokes are provided with one or more sets of symmetrical support pads, and each set of support pads includes four symmetrical right-angled triangle support pads, wherein the triangular hypotenuses of the support pads match the section of the iron yoke . By arranging the supporting pads, the clamping part of the clamping part is made flatter, which facilitates the clamping of the clamping part, and improves the stability and reliability of the clamping part.

The right-angled corner of each of the support pads is provided with a strap groove in the same direction as the cross section of the iron yoke. By increasing the strap groove, the small strap can be stably and firmly bound on the support pad of the iron yoke.

The strap groove is a chamfered groove, and a circular arc transition is formed between the chamfered surface and the triangular right-angled side planes on both sides. The chamfered groove is easy to process, and the arc transition removes the sharp angle, which will not damage the small binding strap.

The fastening device includes a long tie rod, a short tie rod and an iron yoke support plate, the long tie rod is fixedly connected to the clamps on the same side of the iron core frame, and the short tie rod is fixed to the front and rear clamps in the front and rear direction of the iron core , the iron yoke support plate is attached to the outer support pads of the upper and lower iron yokes, and the front and rear ends of the iron yoke support plate are fixedly connected to the clips on both sides. By arranging fixing structures such as tie rods in different directions on the clamp, the iron core frame and the clamp are more firm and reliable.

Both the long tie rod and the short tie rod are double-ended screws, and are fixedly connected to the clip by bolts. Fastened by bolts, easy to disassemble and maintain.

Each clamping piece includes a rectangular clamping plate for clamping the iron core, a long tie rod fixing plate for fixing the long tie rod fixed on the two long sides of the clamping plate, and a support plate fixing plate for fixing the iron yoke support plate , a support plate is fixedly connected between the ends of the long tie rod fixing plate and the ends on both sides of the support plate fixing plate. The rectangular clamping plate is convenient for clamping the iron yoke, and the long tie rod fixing plate, the support plate fixing plate and the support plate enhance the structural strength of the clamp on the one hand, and are also convenient for fixing the long tie rod and the iron yoke support plate.

Each clip is provided with a plurality of bilaterally symmetrical reinforcing ribs, and the reinforcing ribs are vertically connected to the fixing plate and the clamping plate. The structural strength of the clip is enhanced by setting the reinforcing rib.

Each clamping plate is provided with two left-right symmetrical tie rod holes through which short tie rods are penetrated; each long tie rod fixing plate is provided with three tie rod holes on the left, middle and right sides through which long tie rods are penetrated. The clamping structure of the fastening device is more reasonable and firmer by setting the tie rod holes in a reasonable number and position.

The clamping plate of each clamp is provided with a grounding post. The grounding operation of the iron core is facilitated by setting the grounding post.

There are no tie rods at the upper and lower iron yoke positions of the iron core frame and when the clips are fastened, and there are no tie rod perforations for the tie rods at the upper and lower iron yokes of the iron core frame. Simple structure and easy processing.

Beneficial effects: In locomotive traction transformers, the stability and reliability of the structure are improved, the weight of the transformer is reduced, and the no-load loss and no-load current are higher than those of conventional laminated cores by using coiled iron cores instead of traditional laminated iron core structures. The transformer is greatly reduced, the noise is effectively reduced, the energy saving effect is remarkable, and the manufacturing process is simpler, the utilization rate of the raw material of the transformer silicon steel sheet is high, the manufacturing process precision is easier to control, and the production capacity is greatly improved, which meets the use of electrified railway locomotive traction transformers and green energy saving Require.

Description of drawings

Fig. 1 is a schematic diagram of the front view structure of the utility model.

Fig. 2 is a side view structural diagram of the utility model.

Fig. 3 is a schematic diagram of the top view structure of the utility model.

In the figure: 1-iron core frame; 2-supporting plate; 3-large binding strap; 4-support pad; 5-insulation partition; 6-clip; 7-iron yoke support plate; 9-long tie rod; 10-short tie rod; 11-small binding strap; 601-clamping flat plate; 602-long tie rod fixing plate; 603-support plate fixing plate; 604-support plate;

detailed description

The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings of the description.

As shown in Figure 1-3, a coiled iron core structure of a locomotive traction transformer includes an iron core frame 1, a binding strap for binding the iron core frame 1, and four clips for clamping the upper and lower iron yokes of the iron core 6. The fastening device used to fix the clip 6 and the iron core frame 1. The iron core frame 1 is a single-phase two-column roll core structure formed by winding silicon steel sheet material; the upper and lower iron yoke positions of the iron core frame 1 There is a support pad 4 matching its cross-sectional shape; the front and rear surfaces and the left and right surfaces of the two iron core columns on the left and right sides of the iron core frame 1 are pasted with a support plate 2, and an oil flow channel is opened on the bonding surface of the support plate and the iron core, and the iron core An insulating partition 5 is provided between the iron yoke of the frame 1 and the clip 6; the binding straps include a large binding strap 3 for binding the iron core column and a small binding strap 11 bound on the supporting pad 4, and the large binding strap 3 binds the Support plate 2 and iron core column. By adopting the coiled core structure to replace the stacked core structure of the traditional locomotive traction transformer, the traditional stacked core rods are eliminated, the structural stability and reliability of the core are enhanced, and the weight of the core is reduced. The magnetic flux distribution and temperature distribution of the core are more uniform, there is no air gap in the entire magnetic circuit, the magnetic resistance is small, and the no-load loss and no-load current are lower than those of conventional laminated core transformers.

In order to facilitate the clamping of the clip 6, the upper and lower iron yokes are provided with four sets of symmetrical support pads 4, and each set of support pads 4 includes four symmetrical right-angled triangle support pads 4, wherein the triangular hypotenuses of the support pads 4 Compatible with iron yoke section. By arranging the support pad 4, the clamping part 6 is made flatter, which facilitates the clamping of the clamping part 6, and improves the stability and reliability of the clamping part 6.

In order to facilitate the binding of the binding belt, the right-angled corner of each support pad 4 is provided with a binding groove in the same direction as the cross section of the iron yoke. By increasing the strap groove, the small strap 11 can be stably and firmly bound on the support pad 4 of the iron yoke.

In order to facilitate processing and not damage the binding strap, the binding groove is a chamfered groove, and the transition between the chamfered surface and the triangular right-angled side planes on both sides is a circular arc transition. The chamfered groove is easy to process, and the arc transition removes the acute angle, so the small binding strap 11 will not be damaged.

In order to make the clip 6 and the iron core frame 1 more firm, the fastening device includes a long tie rod 9, a short tie rod 10 and an iron yoke support plate 7, the long tie rod 9 is fixed to the same side of the iron core frame 1, the clip 6, and the short tie rod 10 Fix the front and rear clamps 6 in the front and rear directions of the iron core, and the iron yoke support plate 7 is attached to the outer support pads 4 of the upper and lower iron yokes, and the front and rear ends of the iron yoke support plate 7 are fixed to the clamps 6 on both sides. catch. By arranging fixing structures such as pull rods in different directions on the clip 6, the iron core frame 1 and the clip 6 are more firm and reliable.

In order to facilitate assembly and disassembly, both the long pull rod 9 and the short pull rod 10 are double-ended screws, and are fixedly connected to the clip 6 by bolts. Fastened by bolts, easy to disassemble and maintain.

In order to make the structure of the clips 6 stable and firm, each clip 6 includes a rectangular clamping flat plate 601 for clamping the iron yoke, and a long pull rod fixed to the two long sides of the clamping flat plate 601 for fixing the long pull rod 9 . The plate 602 and the support plate fixing plate 603 for fixing the iron yoke support plate 7 , and the ends on both sides of the long pull rod fixing plate 602 and the support plate fixing plate 603 are fixedly connected with a support plate 604 . The rectangular clamping flat plate 601 is convenient for clamping the iron yoke, and the long pull rod fixing plate 602, the support plate fixing plate 603 and the support plate 604 have enhanced the structural strength of the clamp 6 on the one hand, and are also convenient for the long pull rod 9 and the iron yoke support plate 7 in addition. fixed.

In order to better improve the structural strength of the clips 6 , each clip 6 is provided with six left and right symmetrical reinforcing ribs 605 , and the reinforcing ribs 605 are vertically connected to the fixing plate and the clamping plate 601 . The structural strength of the clip 6 is enhanced by providing the ribs 605 .

In order to make the fastening force of the clip 6 uniform, each clamping plate 601 is provided with two left and right symmetrical tie rod holes through which the short tie rods 10 are inserted; each long tie rod fixing plate 602 is provided with three holes in the left, middle and right The pull rod hole of long pull rod 9. By setting the tie rod holes in a reasonable number and position, the clamping structure of the fastening device is more reasonable and firmer, and the clamping force distribution of the clamping piece 6 and the iron core frame 1 is more uniform.

In order to facilitate the grounding of the iron core frame 1 , each clip 6 is provided with a grounding post 8 . The grounding operation of the iron core is facilitated by setting the grounding post 8 .

During production, first adjust the relevant parameters of the iron core winding equipment, so that the silicon steel sheet strips of different widths are successively wound, and finally rolled into an iron core frame 1 with a cross-section close to a circle, and the support plate 2 is pasted on the iron core The front and rear surfaces and the left and right surfaces of the core column are tightly bound with large binding bands 3; support pads 4 are placed on the front and rear sides of the upper and lower iron yokes, a total of 4 groups, and each group of 4 blocks is placed on the steps on the side of the iron yoke. Pay attention to the cooperation with the iron core frame 1 and the iron yoke support plate 7, and wrap it tightly with a small binding tape 11; place the four clips 6 on the upper and lower iron yokes of the iron core frame 1, and place between the clip 6 and the iron yoke Insulation partition 5; use long pull rod 9, short pull rod 10 and iron yoke support plate 7 to connect and fasten four clips 6, and finally connect iron core frame 1 and clip 6 at one point through the grounding lead, and then connect clip 6 The grounding post 8 of the transformer is connected with the case cover of the transformer through a ground lead wire, and is grounded after being drawn out from the case cover. In this example, there is no joint between the coiled iron core silicon steel strips, and the magnetic flux distribution and temperature distribution of the iron core tend to be uniform. Since the direction of the working magnetic flux is always along the rolling direction, the directionality can also be fully utilized to achieve The superior electromagnetic performance of the silicon steel sheet, the iron loss process coefficient is significantly reduced, the iron core is vacuum annealed during the manufacturing process, which can basically eliminate the internal stress, there is no high reluctance in the magnetic circuit, and the no-load loss and no-load current ratio Conventional laminated core transformers can reduce about 30%, noise level can be reduced by 7-10dB, core cross-section fill factor is high, overload and short-circuit resistance are strong.

The coiled iron core structure of a locomotive traction transformer shown in Figures 1-3 above is a specific embodiment of the utility model, which has already reflected the substantive features and progress of the utility model, and can be used in the utility model according to actual use needs. Under the inspiration of , the equivalent modification of its shape, structure and other aspects are all within the scope of protection of this scheme.

Claims (11)

1. A coiled iron core structure of a locomotive traction transformer, including an iron core frame (1), a binding strap for binding the iron core frame (1), and four clips (6 ), the fastening device for fixing the clip (6) and the iron core frame (1), is characterized in that: the iron core frame (1) is a single-phase two-column coil formed by winding silicon steel sheet strips Iron core structure; the upper and lower iron yokes of the iron core frame (1) are provided with support pads (4) matching the cross-sectional shape; An insulating partition (5) is provided between the iron yoke of the iron core frame (1) and the clamp (6); The small binding strap (11) on the support block (4), the large binding strap (3) binds the strut plate (2) and the iron core post. 2. The wound core structure of a locomotive traction transformer according to claim 1, characterized in that: the upper and lower iron yokes are provided with one or more sets of symmetrical support pads (4), and each set supports The pads (4) include four symmetrical right-angled triangular support pads (4), wherein the triangular hypotenuses of the support pads (4) match the cross-section of the iron yoke. 3. The coiled iron core structure of a locomotive traction transformer according to claim 1, characterized in that: the right-angled corner of each support pad (4) is provided with a strap in the same direction as the cross section of the iron yoke groove. 4. The wound core structure of a locomotive traction transformer according to claim 3, characterized in that: the strap groove is a chamfered groove, and the chamfered surface and the triangular right-angled side planes on both sides are circles arc transition. 5. The wound core structure of a locomotive traction transformer according to claim 1, characterized in that: the fastening device includes a long tie rod (9), a short tie rod (10) and an iron yoke support plate (7) , the long tie rod (9) is fixedly connected to the same side clamp (6) of the iron core frame (1), and the short tie rod (10) is fixed to the front and rear clamps (6) of the iron core in the front and rear direction, so The above-mentioned iron yoke support plates (7) are attached to the outer support pads (4) of the upper and lower iron yokes, and the front and rear ends of the iron yoke support plates (7) are fixedly connected to the clips (6) on both sides. 6. The wound core structure of a locomotive traction transformer according to claim 5, characterized in that: the long tie rod (9) and the short tie rod (10) are both double-ended screws, and are connected by bolts and clamps (6) Fixed connection. 7. The wound core structure of a locomotive traction transformer according to claim 1, characterized in that each clamp (6) includes a rectangular clamping plate (601) for clamping the iron yoke, fixed to the clamp The long pull rod fixing plate (602) used to fix the long pull rod (9) and the support plate fixing plate (603) used to fix the iron yoke support plate (7) on the two long sides of the holding plate (601), the long A support plate (604) is fixedly connected between ends on both sides of the tie rod fixing plate (602) and the support plate fixing plate (603). 8. The coiled iron core structure of a locomotive traction transformer according to claim 7, characterized in that: each clip (6) is provided with a plurality of left and right symmetrical reinforcement ribs (605), and the reinforcement The ribs (605) are vertically connected with the fixing plate and the clamping plate (601). 9. The coiled iron core structure of a locomotive traction transformer according to claim 7, characterized in that: each clamping plate (601) is provided with two symmetrical short tie rods (10) Pull rod holes; each long pull rod fixing plate (602) is provided with 3 pull rod holes in the left, middle and right for passing through the long pull rods (9). 10. The wound core structure of a locomotive traction transformer according to claim 1, characterized in that: each clip (6) is provided with a grounding post (8). 11. A coiled iron core structure of a locomotive traction transformer according to claim 1, characterized in that: when the iron core frame (1) is fastened with the upper and lower iron yoke positions and the clip (6), there is no through-center tie rod, and the iron core There is no tie rod perforation for the center tie rod at the upper and lower iron yokes of the frame.