CN210628075U

CN210628075U - Dry-type transformer coil of resin casting belt POM air flue stick

Info

Publication number: CN210628075U
Application number: CN201921375730.4U
Authority: CN
Inventors: 张建国; 包林峰; 张慰
Original assignee: Shanghai Abb Radio And Television Co Ltd
Current assignee: Anyige electric industrial system (Shanghai) Co.,Ltd.
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2020-05-26
Anticipated expiration: 2029-08-22

Abstract

The utility model relates to a resin casting dry-type transformer coil with a POM air flue rod, which comprises a winding, a POM rod, a winding internal mold, a first glass mesh cloth, a second glass mesh cloth and epoxy resin; a first glass grid cloth and a second glass grid cloth are wrapped outside the winding inner die, a plurality of windings are arranged between the first glass grid cloth and the second glass grid cloth, and POM rods are placed in the winding process; the second glass gridding cloth is tightly attached to the winding inner die; the windings are filled with epoxy resin, the POM rods are drawn out after the epoxy resin is solidified and cooled, and the positions of the POM rods are air passages; the winding inner die and the POM rod are both horizontally placed before the epoxy resin is cooled. The utility model discloses place a POM air flue stick during the coil coiling, air flue stick length is unanimous with the wire winding centre form, and POM air flue stick is enveloped together with the winding in the mould during die-filling, and the casting is accomplished, and the coil cooling back utilizes the characteristic that POM material coefficient of thermal expansion is greater than the resin, extracts the POM stick, forms the air flue. The horizontal casting can avoid the distance change between winding sections and the interlaminar dislocation.

Description

Dry-type transformer coil of resin casting belt POM air flue stick

Technical Field

The utility model relates to a dry-type transformer coil, concretely relates to casting is accomplished, and after the coil cooling, utilize the characteristic that POM material coefficient of thermal expansion is greater than the resin, extract the POM stick, form the air flue, adopt horizontal casting can avoid the dry-type transformer coil of the resin casting area POM air flue stick of wire winding intersegmental distance change and interlamination dislocation.

Background

The temperature rise of the dry type transformer coil is related to the heat dissipation area of the coil, the high-capacity foil-wound resin casting dry type transformer coil increases the heat dissipation area, reduces the temperature rise, and a plurality of axial air passages are added in the coil. Due to the structure of the air channel rod, the vertical casting is adopted, the coil wire cakes easily slide off in the die filling and casting process, the distance between the sections of the wire cakes cannot be guaranteed, the layers are staggered, and the coil is scrapped due to short circuit. The horizontal casting can avoid the distance change between the line cake sections and the interlaminar dislocation.

SUMMERY OF THE UTILITY MODEL

To the above problem, the main object of the present invention is to provide a casting method, after cooling the coil, utilizing the coefficient of thermal expansion of the POM material to be greater than the characteristic of the resin, extracting the POM rod, forming the air passage, and adopting horizontal casting to avoid the distance change between the winding sections and the resin casting belt POM air passage rod's dry-type transformer coil with interlaminar dislocation.

The utility model discloses a solve above-mentioned technical problem through following technical scheme: a resin-cast POM air passage bar-containing dry type transformer coil, comprising:

the winding, the POM rod, the winding inner die, the first glass mesh cloth, the second glass mesh cloth and the epoxy resin; a first glass grid cloth and a second glass grid cloth are wrapped outside the winding inner die, a plurality of windings are arranged between the first glass grid cloth and the second glass grid cloth, and POM rods are placed in the winding process; the second glass gridding cloth is tightly attached to the winding inner die; the winding is filled with epoxy resin, the POM rod is drawn out after the epoxy resin is solidified and cooled, the position of the POM rod is an air passage, and the winding inner die and the POM rod are horizontally placed before the epoxy resin is solidified and cooled.

In a specific embodiment of the present invention; the two ends of the winding are provided with outlet terminals, and the middle part is provided with a tapping terminal. The distance between the tapping sections is as follows: 20-50mm, and the distance between the normal sections is 10-20 mm.

In a specific embodiment of the present invention; the distance range between the adjacent air passages is as follows: 2-3 mm.

In a specific embodiment of the present invention; the thickness range of the first glass gridding cloth is as follows: 2.4-4.8 mm.

In a specific embodiment of the present invention; the thickness range of the second glass gridding cloth is as follows: 2.4-4.8 mm.

In a specific embodiment of the present invention; the resin casting dry type transformer coil with the POM air flue rod further comprises a terminal, the terminal is a tap on the winding, a nut is mounted on the terminal and then the terminal is mounted on a tapping plate, a boss is formed after casting, the tapping terminal is used for connecting the winding with an external power supply, and the tapping terminal is used for adjusting voltage.

The utility model discloses an actively advance the effect and lie in: the utility model provides a dry-type transformer coil of resin casting area POM air flue stick has following advantage: the utility model provides a dry-type transformer coil of resin casting area POM air flue stick places a POM air flue stick during the coil coiling, and air flue stick length is unanimous with the wire winding centre form, and POM air flue stick and winding are enveloped together in the mould during die filling, and the casting is accomplished, and after the coil cooling, utilize the characteristic that POM material coefficient of thermal expansion is greater than the resin, extract the POM stick, form the air flue. The utility model discloses a horizontal casting can avoid wire winding intersegmental distance change and dislocation between the layer.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the utility model after casting and forming.

The utility model discloses the name that well reference numeral corresponds:

the device comprises a winding 1, a POM rod 2, a winding inner die 3, a first glass mesh cloth 4, a second glass mesh cloth 5, an air passage 6, a tapping terminal 7, epoxy resin 8 and an outlet terminal 9.

Detailed Description

The following provides a preferred embodiment of the present invention with reference to the accompanying drawings to explain the technical solutions of the present invention in detail.

Fig. 1 is a schematic structural diagram of the present invention. Fig. 2 is a schematic diagram of the utility model after casting and forming. As shown in the above figure, the utility model provides a dry-type transformer coil of resin casting area POM air flue stick, dry-type transformer coil of resin casting area POM air flue stick includes: the winding comprises a winding 1, a POM rod 2, a winding inner die 3, a first glass mesh cloth 4, a second glass mesh cloth 5 and epoxy resin 8; the winding inner die 3 is coated with a first glass mesh cloth 4 and a second glass mesh cloth 5, a plurality of windings 1 are arranged between the first glass mesh cloth 4 and the second glass mesh cloth 5, and the POM rod 2 is positioned in the windings 1.

The winding 1 is filled with epoxy resin 8, and POM stick 2 is taken out after epoxy resin 8 solidifies the cooling, and the position of POM stick 2 is air flue 6, and the interval scope between adjacent air flue 6 is: 2-3 mm.

The thickness ranges of the first glass gridding cloth 4 and the second glass gridding cloth 5 are as follows: 2.4-4.8 mm.

In the specific implementation process, wire outlet terminals are arranged at two ends of the winding, and tapping terminals are arranged in the middle of the winding. The distance between the tapping sections is as follows: 20-50mm, and the distance between the normal sections is 10-20 mm.

The resin casting dry type transformer coil with the POM air flue rod further comprises terminals, the terminals are taps on the winding, nuts are mounted on the terminals and then the terminals are mounted on tapping plates, a boss is formed after casting, the outgoing line terminals 9 are used for connecting the winding with an external power supply, and the tapping terminals 7 are used for adjusting voltage.

The utility model provides a two piece net cloth, respectively in the inside and outside of winding, the winding carries out the epoxy pouring after the mould is adorned, and epoxy adds thermal curing after the pouring is accomplished and becomes integrative, and epoxy is used for encapsulating and filling the winding usefulness, plays insulating effect.

A POM air passage rod is placed when a coil is wound, the length of the air passage rod is consistent with that of a winding inner die, the POM air passage rod and the winding are encapsulated in a die together when the die is installed, casting is completed, and the POM rod is pulled out to form an air passage by utilizing the characteristic that the thermal expansion coefficient of a POM material is greater than that of resin after the coil is cooled.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.

Claims

1. A resin casting belt POM air flue bar dry type transformer coil is characterized in that: the dry type transformer coil of the POM air flue rod of the resin casting belt comprises:

the winding, the POM rod, the winding inner die, the first glass mesh cloth, the second glass mesh cloth and the epoxy resin; a first glass grid cloth and a second glass grid cloth are wrapped outside the winding inner die, a plurality of windings are arranged between the first glass grid cloth and the second glass grid cloth, and POM rods are placed in the winding process; the second glass gridding cloth is tightly attached to the winding inner die; the windings are filled with epoxy resin, the POM rods are drawn out after the epoxy resin is solidified and cooled, and the positions of the POM rods are air passages; and the winding inner die and the POM rod are horizontally placed before the epoxy resin is solidified and cooled.

2. The resin-cast POM air duct bar-equipped dry-type transformer coil as claimed in claim 1, wherein: wire outlet terminals are arranged at the two ends of the winding, and tapping terminals are arranged at the middle part of the winding; the distance between the tapping sections is as follows: 20-50mm, and the distance between the normal sections is 10-20 mm.

3. The resin-cast POM air duct bar-equipped dry-type transformer coil as claimed in claim 1, wherein: the distance range between the adjacent air passages is as follows: 2-3 mm.

4. The resin-cast POM air duct bar-equipped dry-type transformer coil as claimed in claim 1, wherein: the thickness range of the first glass gridding cloth is as follows: 2.4-4.8 mm.

5. The resin-cast POM air duct bar-equipped dry-type transformer coil as claimed in claim 1, wherein: the thickness range of the second glass gridding cloth is as follows: 2.4-4.8 mm.

6. The resin-cast POM air duct bar-equipped dry-type transformer coil as claimed in claim 1, wherein: the length of the POM rod is equal to that of the winding inner die.