CN215417824U

CN215417824U - Inverter transformer

Info

Publication number: CN215417824U
Application number: CN202121856726.7U
Authority: CN
Inventors: 钱江
Original assignee: Wuxi Fule Electronics Co ltd
Current assignee: Wuxi Fule Electronics Co ltd
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2022-01-04
Anticipated expiration: 2031-08-10

Abstract

The utility model discloses an inverter transformer, which comprises a framework, an iron core, a high-voltage coil, a low-voltage coil, a fixed support and a support body, wherein the framework is of an annular structure, the iron core is arranged in an inner cavity of the framework in a penetrating mode, the iron core is fixedly arranged on the fixed support, the low-voltage coil is arranged on an outer ring of the framework in a winding mode, the high-voltage coil is arranged on the outer side of the low-voltage coil in a winding mode, the support body is inserted between the low-voltage coil and the high-voltage coil along the axial direction of the framework and is positioned on the same side of the framework, the high-voltage coil is arranged with the low-voltage coil through the support body in a local interval mode to form a heat dissipation air passage, a temperature sensor is arranged in the heat dissipation air passage, the overall size of the temperature sensor is small, and the temperatures of the inner coil and the outer coil can be monitored.

Description

Inverter transformer

Technical Field

The utility model belongs to the field of transformers, and particularly relates to an inverter transformer.

Background

The inverter transformer is an important component of the isolated inverter, plays an important role in the efficiency, the working reliability and the output electrical performance of the inverter, and the design of a magnetic device is a key factor for the success of the development of the inverter.

There are two main types of magnetic devices used in high power inverters: 1. a high-frequency push-pull transformer; 2. industrial frequency transformer of full-bridge topology structure. In the application occasions where the inverter power supply of motor homes, yachts and the like needs high reliability, the high-frequency transformer is rarely applied due to the reasons of high switching frequency, insufficient reliability of thermal aging and the like, and the use of a power frequency transformer is continued all the time. The conventional industrial frequency transformer is designed and developed according to a linear industrial frequency power transformer, and generally has the characteristics of large volume, low efficiency, poor heat dissipation and the like.

Disclosure of Invention

The purpose of the utility model is as follows: in order to overcome the defects in the prior art, the utility model provides an inverter transformer which is small in overall size and capable of monitoring the temperatures of inner and outer coils.

The technical scheme is as follows: in order to achieve the purpose, the technical scheme of the utility model is as follows:

the utility model provides an inverter transformer, includes skeleton, iron core, high-voltage coil, low-voltage coil, fixed bolster and supporter, the skeleton is the loop configuration, the inner chamber of skeleton is worn to establish by the iron core, the iron core is fixed to be set up on the fixed bolster, the low-voltage coil is around establishing on the outer lane of skeleton, the outside of low-voltage coil is around being equipped with high-voltage coil, the supporter is inserted along the axial of skeleton and is established between low-voltage coil and the high-voltage coil, just the supporter is located same one side of skeleton, high-voltage coil passes through the supporter and sets up and constitute the heat dissipation air flue with low-voltage coil local interval, be provided with temperature sensor in the heat dissipation air flue.

Furthermore, the supporting body is of a strip-shaped structure made of insulating materials, and at least one supporting body is arranged on the same side of the framework and is inserted between the low-voltage coil and the high-voltage coil.

Further, the temperature sensor comprises two adjacent supporting bodies arranged at intervals, and the temperature sensor is arranged between the two supporting bodies.

Furthermore, the binding post of high-voltage coil, low-voltage coil is located same one side of skeleton, the supporter sets up corresponding to one side of high-voltage coil, low-voltage coil binding post.

Further, the support body is made of fiber materials.

Further, the iron core is the three post core iron core structures of EI structure, the center pillar core of iron core is worn to establish in the skeleton, all be provided with the insulation board between the axial both ends of high-voltage coil, low-voltage coil and the iron core.

Furthermore, the framework is an insulating paperboard wound to form an annular structure, and the inner ring profile of the framework is the same as the cross section of the center pillar core of the iron core.

Further, the fixed bolster includes that two symmetries set up splint one and splint two in the iron core both sides, it is provided with locking screw and nut to connect on splint one and the splint two.

Has the advantages that: the low-voltage coil is arranged on the inner side of the high-voltage coil, the whole volume can be reduced, the insulation distance to the ground can be increased, and the safety of the transformer can be improved. On the other hand, the low-voltage coil on the inner side can exchange heat with air, so that the transformer is efficiently cooled, and meanwhile, the temperature is detected through the temperature sensor.

Drawings

FIG. 1 is a perspective view of the overall structure of the present invention;

fig. 2 is an exploded view of the overall structure of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in the attached fig. 1 and 2, an inverter transformer comprises a framework 1, an iron core 2, a high-voltage coil 3, a low-voltage coil 4, a fixed support 11 and a support body 6, wherein the framework 1 is of an annular structure, the framework 1 is an insulating paperboard which is of an annular structure and is wound on the framework, the inner ring profile of the framework 1 is the same as the cross section of a middle column core of the iron core, the iron core 2 is of a three-column core iron core structure of an EI structure, the middle column core of the iron core 2 is arranged in the framework 1 in a penetrating manner, insulating plates 15 are arranged between the two axial ends of the high-voltage coil 3 and the low-voltage coil 4 and the iron core 2, the iron core 2 is arranged in an inner cavity of the framework 1 in a penetrating manner, the iron core 2 is fixedly arranged on the fixed support 11, the fixed support 11 comprises a first clamping plate 11a and a second clamping plate 11b which are symmetrically arranged on two sides of the iron core 2, and a locking screw 7 and a nut 14 are connected on the first clamping plate and the second clamping plate, and both ends of the locking screw 7 are sleeved with a flat pad 9 and an insulating pad 12.

The low-voltage coil 4 is wound on the outer ring of the framework 1, the high-voltage coil 3 is wound on the outer side of the low-voltage coil 4, the supporting body 6 is inserted between the low-voltage coil 4 and the high-voltage coil 3 along the axial direction of the framework, the supporting body 6 is positioned on the same side of the framework 1, the high-voltage coil 3 is arranged at a local interval with the low-voltage coil 2 through the supporting body 6 and forms a heat dissipation air channel, a local bulge is formed between the high-voltage coil 3 and the low-voltage coil 4, the rest coil parts are still in insulated contact with each other, air gaps can be greatly reduced, the low-voltage coil on the inner side can also exchange heat with air, the transformer is dissipated heat efficiently, the temperature sensor 5 is arranged in the heat dissipation air channel, the temperature of the coil can be monitored, and the transformer can move and stop working when the temperature rise exceeds the design requirement under the extreme use condition, the transformer is protected, and the transformer can be recovered after the temperature is recovered to be normal.

The supporter 6 is the strip structure of insulating material, supporter 6 is the fibre material, the center pillar core shape adaptation of skeleton and iron core for the skeleton is rectangle annular structure, contains one at least on the same one side of skeleton supporter 6 inserts and establishes between low voltage coil 4 and high voltage coil, carries out the uplift to high voltage coil through supporter 6, in order to form the air flue.

The temperature sensor comprises two adjacent supporting bodies 6 arranged at intervals in the embodiment, and the temperature sensor 5 is arranged between the two supporting bodies 6 so as to ensure the installation space of the temperature sensor.

High-voltage coil 3, low-voltage coil 4's binding post lie in same one side of skeleton 1, supporter 6 sets up corresponding to one side of high-voltage coil 3, low-voltage coil 4 binding post, do benefit to and dispel the heat to coil joint region, also do benefit to the whole external equipment of transformer and work a telephone switchboard.

The high-voltage coil 3 is formed by winding enameled wires with high insulation property and high strength, wherein the enameled wires are wound for a certain number of turns, such as 76 turns, and then the enameled wires are wound for a certain number of turns, such as 38 turns, after one end is drawn out, and the leading-out wires of the high-voltage coil 3 are respectively provided with the terminals 13 with the insulation sheaths.

The low-voltage coil 4 is wound by high-precision copper strips in two layers, such as 0.51 × 78.5mm specification, and the middle of the low-voltage coil is insulated and isolated by insulating paper 10. The first layer of inner circle is drawn forth with the right angle, the certain number of turns of coiling, if 9 circles, first layer copper strips tail end is drawn forth with the oblique angle, second layer copper strips is drawn forth with the oblique angle, the certain number of turns of coiling, if 9 circles, the tail end of second layer copper strips is drawn forth with the right angle, the right angle is drawn forth all on it, the oblique angle is placed below with the symmetric mode, and turn over the outside to high-voltage coil 3, the tail end of first layer copper strips is connected with the head end of second layer copper strips, in order to constitute complete low-voltage coil, and the joint portion turns over to turn over to high-voltage coil outside, can fully dispel the heat to the joint portion, prevent that local temperature is too high.

The overall production and assembly installation sequence is as follows:

s1: the bobbin is provided with a framework 1, and the joint is stuck and sealed by an adhesive tape;

s2: winding a first layer of low-voltage coil 4, inserting isolation insulation paper 10 after winding, fixing by using an adhesive tape, and winding by using a second layer of copper strip according to the method described above to finish the low-voltage coil;

s3: a temperature controller 5 and a support body 6 are arranged on the leading-out side of the low-voltage coil, are fixed by an adhesive tape and are coated with insulating paper to form an air passage;

s4: winding to finish the high-voltage coil;

s5: inserting the steel sheets into the coil in a crossed manner one by one, wherein no gap exists between the I strip and the E sheet, and the surface is smooth until the total thickness of the iron core 1 meets the specified requirement;

s6: and a fixed bracket 11 is installed and installed at the bottom and the upper part of the iron core by using a locking bolt 7, a flat gasket 9, an insulating gasket 12, a bracket I11 a, a flat gasket, the iron core 2, a bracket II 11b and a nut 14 in sequence.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the utility model and these are intended to be within the scope of the utility model.

Claims

1. An inverter transformer, characterized in that: comprises a framework (1), an iron core (2), a high-voltage coil (3), a low-voltage coil (4), a fixed bracket (11) and a supporting body (6), the framework (1) is of an annular structure, the iron core (2) is arranged in the inner cavity of the framework (1) in a penetrating way, the iron core (2) is fixedly arranged on the fixed support (11), the low-voltage coil (4) is wound on the outer ring of the framework (1), the high-voltage coil (3) is wound on the outer side of the low-voltage coil (4), the support body (6) is inserted between the low-voltage coil (4) and the high-voltage coil (3) along the axial direction of the framework, and the support body (6) is positioned on the same side of the framework (1), the high-voltage coil (3) is arranged at a local interval with the low-voltage coil (4) through the support body (6) to form a heat dissipation air passage, and a temperature sensor (5) is arranged in the heat dissipation air passage.

2. The inverter transformer according to claim 1, wherein: the supporting body (6) is of a strip-shaped structure made of insulating materials, and at least one supporting body (6) is arranged on the same side of the framework and is inserted between the low-voltage coil (4) and the high-voltage coil.

3. The inverter transformer according to claim 2, wherein: comprises two adjacent supporting bodies (6) arranged at intervals, and the temperature sensor (5) is arranged between the two supporting bodies (6).

4. The inverter transformer according to claim 2, wherein: the binding post of high pressure coil (3), low pressure coil (4) is located same one side of skeleton (1), supporter (6) set up corresponding to one side of high pressure coil (3), low pressure coil (4) binding post.

5. The inverter transformer according to claim 2, wherein: the supporting body (6) is made of fiber materials.

6. The inverter transformer according to claim 1, wherein: iron core (2) are the three-column core iron core structure of EI structure, the center pillar core of iron core (2) is worn to establish in skeleton (1), all be provided with between the axial both ends of high-voltage coil (3), low-voltage coil (4) and iron core (2) insulation board (15).

7. The inverter transformer according to claim 6, wherein: the iron core is characterized in that the framework (1) is an insulating paperboard which is wound to form an annular structure, and the inner ring profile of the framework (1) is the same as the section of a center pillar core of the iron core.

8. The inverter transformer according to claim 1, wherein: the fixed support (11) comprises a first clamping plate (11a) and a second clamping plate (11b) which are symmetrically arranged on two sides of the iron core (2), and the first clamping plate and the second clamping plate are connected and provided with a locking screw rod (7) and a nut (14).