CN220672365U - Isolation transformer - Google Patents

Abstract

The utility model provides an isolation transformer, which comprises a supporting framework and a coil, wherein the supporting framework comprises an upper framework, a winding groove and a lower framework which are sequentially connected from top to bottom, the coil comprises a primary coil and a secondary coil, through arranging inlet wires and outlet wires of the primary coil and the secondary coil at two ends of the supporting framework respectively, and arranging inlet wires and outlet wires of the same-level coil at the upper layer and the lower layer of the supporting framework respectively, and simultaneously, the inlet wires and the outlet wires are spaced in the axial direction, so that the four wire ends of the primary coil and the secondary coil of the isolation transformer have no contact risk, the insulation requirement is ensured, secondary insulation materials are cancelled, the sequential winding work of each winding is changed into the unified winding in the final working procedure, the winding working procedure is simplified, the automatic production is comprehensively realized, the cost is reduced, the manual operation is simplified, the automatic production is realized, and the processing production is flexible and the application is flexible.

Description

Isolation transformer

Technical Field

The utility model relates to the technical field of transformers, in particular to an isolation transformer.

Background

An isolation transformer refers to a transformer in which the input winding is electrically isolated from the output winding. According to European and American market certification requirements, certain insulation requirements are required between the primary and the secondary of the isolation transformer. The method specifically comprises the following steps: 1. the contact risk is not required to be caused by the complete insulation between the windings; 2. the insulating tape between the primary and secondary different levels needs to have certain thickness requirements; 3. the secondary insulation is needed before and after the secondary, and the secondary insulation can be added with insulating materials such as adhesive tapes, sleeves, retaining walls and the like, and can also realize physical isolation through means such as a framework structure, a winding process and the like.

Common secondary insulation methods currently include:

1. an insulating adhesive tape is added and stuck at the position with hidden contact trouble to play a role in insulating isolation, for example, the adhesive tape is covered at the exposed wire taking-up position; the disadvantage of this method is that: the adhesive tape needs to be manually cut and pasted, the production efficiency is influenced by manual operation, meanwhile, the position is easy to run, the insulation effect is poor, and compared with the process of sleeving, the adhesive tape is smoother and lower in cost;

2. an insulating sleeve is added, and a teflon sleeve is commonly used; the defects are that: the sleeve needs to be completed in an auxiliary way through an automatic sleeve penetrating machine, the sleeve is retracted after being heated, the sleeve is short and cannot completely cover the exposed position, the sleeve is large in size, the winding flatness is affected, the hanging wire is blocked when entering the groove, and the sleeve cost is high.

Therefore, the utility model designs an isolation transformer structure which can realize full-automatic production by a physical isolation mode and without sleeving, adhesive tape and other secondary insulating materials.

Disclosure of Invention

In order to solve the problems in the prior art, the purpose of the application is to provide an isolation transformer, wherein the structure of a supporting framework of the isolation transformer is changed, and the connection mode of a primary coil and a secondary coil inlet and outlet wire is correspondingly changed, so that the primary coil and the secondary coil inlet and outlet wire are not contacted at all, physical isolation is realized, secondary insulating materials are avoided, full automation is realized in the production process, the production efficiency of the isolation transformer is improved, and the production cost is reduced.

The specific technical scheme comprises the following steps:

the utility model provides an isolation transformer, which comprises a supporting framework and a coil, wherein the supporting framework comprises an upper framework, a winding groove and a lower framework which are sequentially connected from top to bottom in the Y-axis direction, the coil is wound on the winding groove, and the coil comprises a primary coil and a secondary coil; the upper layer framework and the lower layer framework are respectively provided with a plurality of wire hanging pins at two ends in the Z axial direction, and each wire hanging pin comprises a first primary wire hanging pin arranged on the upper layer framework, a first secondary wire hanging pin in the opposite direction, a second primary wire hanging pin in the same direction as the first primary wire hanging pin and a second secondary wire hanging pin in the same direction as the first secondary wire hanging pin; the inlet and outlet wires of the primary coil are respectively connected with the first primary wire hanging pin and the second primary wire hanging pin, the inlet and outlet wires of the secondary coil are respectively connected with the first secondary wire hanging pin and the second secondary wire hanging pin, and axial distances are reserved between the first primary wire hanging pin and the second primary wire hanging pin and between the first secondary wire hanging pin and the second secondary wire hanging pin in the Z-axis direction.

The inlet wire and the outlet wire of the primary coil and the outlet wire of the secondary coil are respectively arranged at two ends of the supporting framework, the inlet wire head and the outlet wire head of the same-level coil are respectively arranged at the upper layer and the lower layer of the supporting framework, and meanwhile, the inlet wire head and the outlet wire head are axially spaced, so that the four wire heads of the primary coil and the secondary coil of the isolation transformer are free from contact risk, and the insulation requirement can be ensured without additionally adding secondary insulation materials (adhesive tapes or sleeves). The winding modes can be combined at will, so that full-automatic production is realized.

Preferably, the first primary hanging wire pin and the first secondary hanging wire pin are both hanging. The upper hanging type pin solves the problem of right-angle wire winding when the wire is wound, and can uniformly wind the wire at the outermost side after all windings are completed, so that all the windings are smoother, the leakage inductance consistency is good, and the leakage inductance level is low.

Preferably, the upper layer skeleton with the lower floor skeleton still is equipped with a plurality of U type metallic channels that run through respectively along Z axial, U type metallic channel with the string of wire pin is adjoined, and the groove depth between upper and lower floor U type metallic channel of same orientation and/or between the U type metallic channel of same layer is different. The wire groove makes inlet wire and be qualified for next round of competitions on can following the wire groove direction and hang the line pin, makes the end of a thread can hang the line perpendicularly, and the depth is different between the U type wire groove on the same direction, including the groove depth of U type wire groove between the different layers sets up to different, and/or the groove depth of same layer U type groove is different for existing Y axle difference in height between the winding, form the interval in X axle direction again, the winding of upper strata and lower floor realizes insulating totally through the difference in height, and primary coil can not contact secondary coil completely, need not secondary insulation modes such as sleeve pipe and insulating tape, can realize automatic routing.

Preferably, the U-shaped wire groove of the upper framework or the U-shaped wire groove of the lower framework is also provided with a gradient guide block. The gradient guide block has the function of further increasing the height difference in the Y-axis direction and avoiding the contact of the coil joints.

Preferably, a tapered structure is arranged between the inner end surfaces of the upper layer framework and the lower layer framework and the winding groove. The upper and lower parts of the winding groove are funnel-shaped, the width is narrowest when the first group of windings are wound, and the width is gradually widened along with the increase of winding coils, so that the interlayer height difference exists between the upper layer winding and the lower layer winding, and complete insulation is realized.

Preferably, the outer winding surfaces of the primary coil and the secondary coil are further covered with insulating tapes, respectively. Poor insulation between coils is avoided.

Preferably, the insulating tape is widened along the two axial ends of the winding groove, a plurality of tooth-shaped openings are formed in the two ends of the insulating tape, and the inlet and outlet wires of the primary coil and the secondary coil are led out from the tooth-shaped openings. The enameled wires are led out from the tooth marks, the edge of a winding framework can be covered by the enameled wires, the width of each layer of winding is increased through the toothed adhesive tape to improve insulation, the problems that the reverse-folding adhesive tape cannot automatically wind, the adhesive tape is easy to run, the winding is wound in and the like can be replaced, the problem that the winding layers are fallen between the windings is solved, the winding quality is ensured, the problem that the winding of the framework side feet can be collided is solved, and insulation is improved.

Preferably, the isolation transformer further comprises a magnetic core, the supporting framework is I-shaped along the X axis, a through hollow magnetic core groove is further formed in the Y axis of the supporting framework, the outer wall of the magnetic core groove, the upper framework and the lower framework form the winding groove, and magnetic core clamping grooves are symmetrically formed in the X axis of the supporting framework; the magnetic core is embedded into the magnetic core groove and the magnetic core clamping groove oppositely by two mountain-shaped sub-magnetic cores, and the coil is arranged between the winding groove and two ends of the magnetic core.

Preferably, at least one of the wire hanging pins of the upper layer framework or the wire hanging pins of the lower layer framework is provided with a metal elastic sheet, and the metal elastic sheet is in press-fit contact with the magnetic core. The metal spring sheet is used for replacing the original process of connecting the magnetic core at the tail wire of 5-10mm on the shielding and auxiliary winding, the original process needs to be connected with the magnetic core after tin coating, the mode of connecting the spring sheet at the edge of the framework is used, and the magnetic core and the framework are assembled by pressing contact, so that the problems of difficult wire-leaving, manual tin coating, manual operation of connecting the magnetic core by binding and winding, and the quality problems of falling off and wire falling and the like of the original process are solved.

Preferably, the metal elastic sheet is arranged on the wire hanging pin which is the most close to the wire hanging pin. Avoiding interference with the connection of other incoming and outgoing lines and the wire hanging pins.

According to the utility model, the inlet wires and the outlet wires of the primary coil and the secondary coil are respectively arranged at two ends of the supporting framework, the inlet wires and the outlet wires of the same-level coil are respectively arranged at the upper layer and the lower layer of the supporting framework, and meanwhile, the inlet wires and the outlet wires are axially spaced, so that the four wires of the primary coil and the secondary coil of the isolation transformer are free from contact risks, the insulation requirement is ensured, the secondary insulation material is cancelled, the original sequential winding work of each winding is changed into the unified winding work of all windings in the final working procedure, the winding working procedure is simplified, the automatic production is comprehensively realized, the cost is reduced, the manual operation is simplified, the automatic production is realized, and the processing production and the application are flexible.

Drawings

Figures 1-7 are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the utility model. Many of the intended advantages of other embodiments and embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

FIG. 1 is a schematic perspective view of an isolation transformer according to the present utility model;

FIG. 2 is an exploded schematic view of an isolation transformer according to the present utility model;

FIG. 3 is a perspective view of one embodiment of a support frame for an isolation transformer according to the present utility model;

FIG. 4 is a schematic cross-sectional view of one embodiment of an isolation transformer according to the present utility model;

FIG. 5 is a schematic diagram of another embodiment of a winding slot of an isolation transformer according to the present utility model;

fig. 6 is a perspective view of an insulating tape of an isolation transformer according to the present utility model;

FIG. 7 is a bottom perspective view of an isolation transformer according to the present utility model;

1. a support skeleton; 2. a coil; 3. an insulating tape; 4. a magnetic core; 5. an insulating sleeve; 6. a metal spring plate; 10. an upper layer skeleton; 101. a first primary wire hanging pin; 102. a first secondary wire hanging pin; 103. an upper layer U-shaped wire groove; 11. a lower layer skeleton; 111. a second primary wire hanging pin; 112. a second secondary wire hanging pin; 113. a lower U-shaped wire groove; 114. a gradient guide block; 12. a wire winding groove; 13. a magnetic core slot; 14. a magnetic core clamping groove; 20. a primary coil; 21. a secondary coil; 30. an inner insulating tape; 31. an outer insulating tape.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The present utility model will be described in detail with reference to fig. 1 to 7.

Fig. 1 is a perspective view of an isolation transformer according to the present utility model, and fig. 2 is an exploded view of the present utility model. As shown in fig. 1 and 2, the utility model provides an isolation transformer, which comprises a supporting framework 1 and a coil 2, wherein the supporting framework 1 comprises an upper framework 10, a winding groove 12 and a lower framework 11 which are sequentially connected from top to bottom in the Y-axis direction, the coil 2 is wound on the winding groove 12, and the coil 2 comprises a primary coil 20 and a secondary coil 21; the two ends of the upper layer skeleton 10 and the lower layer skeleton 11 in the Z axial direction are respectively provided with a plurality of wire hanging pins, including a first primary wire hanging pin 101 arranged on the upper layer skeleton 10, a first secondary wire hanging pin 102 in the opposite direction, a second primary wire hanging pin 111 arranged on the lower layer skeleton 11 in the same direction as the first primary wire hanging pin 101, and a second secondary wire hanging pin 112 in the same direction as the first secondary wire hanging pin 102; the inlet and outlet wires of the primary coil 20 are respectively connected with the first primary wire hanging pin 101 and the second primary wire hanging pin 111, the inlet and outlet wires of the secondary coil 21 are respectively connected with the first secondary wire hanging pin 102 and the second secondary wire hanging pin 112, and axial spaces are respectively formed between the first primary wire hanging pin 101 and the second primary wire hanging pin 111 and between the first secondary wire hanging pin 102 and the second secondary wire hanging pin 112 in the Z-axis direction.

The inlet and outlet wires of the primary coil 20 and the secondary coil 21 are respectively arranged at two ends of the supporting framework 1, the inlet wire heads and the outlet wire heads of the same-level coils are respectively arranged at the upper layer and the lower layer of the supporting framework, and meanwhile, the inlet wire heads and the outlet wire heads are axially spaced, so that the four wire heads of the primary coil 20 and the secondary coil 21 of the isolation transformer are arranged at intervals in staggered layers, the contact risk is avoided, and the insulation requirement can be ensured without additionally adding secondary insulation materials (adhesive tapes or sleeves). The winding modes can be combined at will, so that full-automatic production is realized.

The winding mode comprises winding of the coil from top to bottom, winding of the coil from bottom to top, or winding of the coil from top to bottom, winding of the coil from bottom to top, and full-automatic production of the coil can be realized by any combination due to no contact risk of the incoming wire and the outgoing wire head.

The coil material comprises enameled wires, three layers of insulated wires, film covered wires, three layers of stranded wires or litz wires and the like.

In a specific embodiment, with continued reference to fig. 1 and 2, the first primary wire hanging pin 101 and the first secondary wire hanging pin 102 are both hanging. The problem of pressure right angle receipts line when receiving the line can be solved to hanging pin mode on adopting, after all windings are accomplished, receive the line in unison in the outside for all windings are more level, and leakage inductance uniformity is good, and leakage inductance level is low.

Fig. 3 is a perspective view of a specific embodiment of the support frame 1, in which the winding slots 12 are straight up and down. The upper layer framework 10 and the lower layer framework 11 are further provided with a plurality of through U-shaped wire grooves 103 (upper layer) and 113 (lower layer) along the Z axial direction respectively, the U-shaped wire grooves 103 and 113 are respectively adjacent to wire hanging pins of the upper layer and the lower layer, each U-shaped wire groove is adjacent to one wire hanging pin, and groove depths between the upper layer U-shaped wire groove and the lower layer U-shaped wire groove in the same direction and/or between the U-shaped wire grooves of the same layer are different.

The wire groove makes inlet wire and be qualified for next round of competitions on can following the wire groove direction and hang the line pin, makes the end of a thread can hang the line perpendicularly, and the depth of groove is different between the U type wire groove on the same direction, including the groove depth setting of U type wire groove between the different layers is different, and/or the groove depth of same layer U type groove is different for existing Y axle difference in height between the winding, form the interval in X axle direction again, the winding of upper strata and lower floor realizes insulating totally through the difference in height, primary coil 20 can not contact secondary coil 21 totally, need not to add secondary insulation modes such as sleeve pipe and insulating tape, can realize automatic routing.

FIG. 4 is a schematic cross-sectional view of an embodiment of the present utility model. In a specific embodiment, a gradient guide block 114 is further disposed in the U-shaped wire groove 103 of the upper skeleton 10 or the U-shaped wire groove 113 of the lower skeleton 11. The gradient guide block 114 serves to further increase the height difference in the Y-axis direction, and further avoid contact of the coil joints.

Fig. 5 is a schematic diagram of another embodiment of a winding slot of an isolation transformer according to the present utility model, wherein a tapered structure is formed between the inner end surfaces of the upper layer bobbin 10 and the lower layer bobbin 11 and the winding slot 12. The upper and lower parts of the winding groove 12 are funnel-shaped, the width is narrowest in the first group of winding, and the width is gradually widened along with the increase of winding coils, so that the interlayer height difference exists between the upper layer winding and the lower layer winding, and the insulating performance is better.

In a specific embodiment, with continued reference to fig. 1 and 2, the outer winding surfaces of the primary coil 20 and the secondary coil 21 are further covered with an insulating tape 3, including an inner insulating tape 30 and an outer insulating tape 31, respectively. The insulation tape is arranged between the coils, so that poor insulation between the coils can be avoided.

The insulating tape is a Mala tape.

Fig. 6 is a perspective view of an insulating tape. In a specific embodiment, the insulating tape 3 is widened along the two axial ends of the winding groove 12, two ends of the insulating tape are provided with a plurality of tooth-shaped openings, and the incoming and outgoing lines of the primary coil and the secondary coil are led out from the tooth-shaped openings.

After the original mala adhesive tape is widened by about 1mm, tooth marks are cut at the edge, enameled wires are led out from the tooth marks, the edges of a winding framework can be covered, each layer of winding can be improved in insulation mode by increasing the width through the toothed adhesive tape, the problems that the reverse folding adhesive tape cannot automatically wind, the adhesive tape is easy to run, winding is easy to roll in the winding and the like can be solved, the problem that winding layers fall between the windings is solved, the quality is guaranteed, the problem that the winding of the framework edge is broken is solved, the width is widened, and insulation is improved.

In a specific embodiment, as shown in fig. 1-3, the isolation transformer further includes a magnetic core 4, the supporting frame 1 is i-shaped along the X-axis, the supporting frame 1 is further provided with a through hollow magnetic core slot 13 along the Y-axis, the outer wall of the magnetic core slot 13, the upper frame 10 and the lower frame 11 form the winding slot 12, and magnetic core clamping slots 14 are symmetrically arranged along the X-axis of the supporting frame 1; the magnetic core 4 is embedded into the magnetic core groove 13 and the magnetic core clamping groove 14 which are opposite to each other by two mountain-shaped sub-magnetic cores, and the coil 2 is arranged between the winding groove 12 and two ends of the magnetic core 4.

The magnetic core 4 is used for generating electromagnetic induction with the primary coil 20 and the secondary coil 21 to change voltage output, the magnetic core 4 is composed of two symmetrical mountain-shaped sub-magnetic cores, mountain roots in the middle of the sub-magnetic cores are inserted into the magnetic core grooves 13, mountain roots at two ends are positioned outside the coils by the magnetic core clamping grooves 14, and the structure is convenient for assembling and fixing the magnetic core 4 and the supporting framework 1.

The magnetic core is made of conventional ferrite material.

In order to avoid the problem that the magnetic core 4 is damaged by contact with the outside and poor insulation occurs, an insulating sleeve 5 is further sleeved on the outer surface of the magnetic core 4.

In a specific embodiment, as shown in fig. 7, at least one of the wire hanging pin of the upper layer skeleton 10 or the wire hanging pin of the lower layer skeleton 11 is provided with a metal spring sheet 6, and the metal spring sheet 6 is in press-fit contact with the magnetic core 4. The metal spring 6 is used for replacing the original process of connecting the magnetic core at the tail wire of 5-10mm on the shielding and auxiliary winding, the original process needs to connect the magnetic core after tin coating, the mode of connecting the spring by using the framework edge band is adopted, and the problems of difficult wire-leaving, manual tin coating, manual operation of connecting the magnetic core by binding and winding, and quality problems of falling off and wire falling and the like of the original process are solved by pressing contact during assembling the magnetic core and the framework, and the automatic installation of the spring can be realized by using the metal spring 6 to connect the magnetic core 4, so that the production efficiency is improved, the consistency is good, and the performance is more stable.

In a specific embodiment, the metal spring plate 6 is disposed on the wire hanging pin that is the most adjacent wire hanging pin. Avoiding interference with the connection of other incoming and outgoing lines and the wire hanging pins.

According to the utility model, the inlet wires and the outlet wires of the primary coil and the secondary coil are respectively arranged at two ends of the supporting framework, the inlet wires and the outlet wires of the same-level coil are respectively arranged at the upper layer and the lower layer of the supporting framework, and meanwhile, the inlet wires and the outlet wires are axially spaced, so that the four wires of the primary coil and the secondary coil of the isolation transformer are free from contact risks, the insulation requirement is ensured, the secondary insulation material is cancelled, the original sequential winding work of each winding is changed into the unified winding work of all windings in the final working procedure, the winding working procedure is simplified, the automatic production is comprehensively realized, the cost is reduced, the manual operation is simplified, the automatic production is realized, and the processing production and the application are flexible.

While the principles of the utility model have been described in detail in connection with the preferred embodiments, it should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the present utility model and are not intended to limit the scope of the utility model. The details of the embodiments are not to be taken as limiting the scope of the utility model, and any obvious modifications based on equivalent changes, simple substitutions, etc. of the technical solution of the utility model fall within the scope of the utility model without departing from the spirit and scope of the utility model.

Claims (10)

1. The isolation transformer is characterized by comprising a supporting framework and a coil, wherein the supporting framework comprises an upper framework, a winding groove and a lower framework which are sequentially connected from top to bottom in the Y-axis direction, the coil is wound on the winding groove, and the coil comprises a primary coil and a secondary coil; the upper layer framework and the lower layer framework are respectively provided with a plurality of wire hanging pins at two ends in the Z axial direction, and each wire hanging pin comprises a first primary wire hanging pin arranged on the upper layer framework, a first secondary wire hanging pin in the opposite direction, a second primary wire hanging pin in the same direction as the first primary wire hanging pin and a second secondary wire hanging pin in the same direction as the first secondary wire hanging pin; the inlet and outlet wires of the primary coil are respectively connected with the first primary wire hanging pin and the second primary wire hanging pin, the inlet and outlet wires of the secondary coil are respectively connected with the first secondary wire hanging pin and the second secondary wire hanging pin, and axial distances are reserved between the first primary wire hanging pin and the second primary wire hanging pin and between the first secondary wire hanging pin and the second secondary wire hanging pin in the Z-axis direction.

2. The isolation transformer of claim 1, wherein the first primary wire-hanging pin and the first secondary wire-hanging pin are both hanging.

3. An isolating transformer as claimed in claim 2, wherein the upper layer frame and the lower layer frame are further provided with a plurality of through U-shaped wire grooves along the Z-axis, respectively, the U-shaped wire grooves are adjacent to the wire hanging pins, and the depths of the grooves between the upper layer and the lower layer U-shaped wire grooves in the same direction and/or between the U-shaped wire grooves in the same layer are different.

4. An isolation transformer according to claim 3, wherein a gradient guide block is further provided in the U-shaped conductor groove of the upper layer frame or the U-shaped conductor groove of the lower layer frame.

5. An isolation transformer according to claim 1, wherein the inner end surfaces of the upper and lower bobbins are tapered with the winding slot.

6. An isolation transformer according to claim 1, wherein the outer surrounding surfaces of the primary coil and the secondary coil are further covered with insulating tape, respectively.

7. The isolating transformer as in claim 6, wherein said insulating tape is widened along the axial direction of the two ends of said winding slot, a plurality of tooth-like openings are provided at the two ends of said insulating tape, and the incoming and outgoing lines of said primary coil and said secondary coil are each led out from said tooth-like openings.

8. The isolating transformer according to claim 1, further comprising a magnetic core, wherein the supporting framework is in an i shape along the X-axis, the supporting framework is further provided with a hollow magnetic core groove penetrating along the Y-axis, the outer wall of the magnetic core groove, the upper framework and the lower framework form the winding groove, and the X-axis of the supporting framework is symmetrically provided with magnetic core clamping grooves; the magnetic core is embedded into the magnetic core groove and the magnetic core clamping groove oppositely by two mountain-shaped sub-magnetic cores, and the coil is arranged between the winding groove and two ends of the magnetic core.

9. The isolating transformer of claim 8, wherein at least one of the wire hanging pins of the upper layer frame or the wire hanging pins of the lower layer frame is provided with a metal spring, and the metal spring is in press-fit contact with the magnetic core.

10. An isolating transformer as in claim 9, wherein the metal spring is disposed on the wire hanging pin furthest to the side of the wire hanging pins.