CN213635626U

CN213635626U - Box top mounting type moisture absorber for transformer

Info

Publication number: CN213635626U
Application number: CN202023073222.6U
Authority: CN
Inventors: 徐健; 张孝银; 徐霄
Original assignee: Jiangsu Huachen Transformer Co ltd
Current assignee: Jiangsu Huachen Transformer Co ltd
Priority date: 2020-06-22
Filing date: 2020-12-18
Publication date: 2021-07-06
Anticipated expiration: 2030-12-18

Abstract

The utility model belongs to the technical field of liquid immersed transformer, in particular to a box top mounting type moisture absorber for transformer, which comprises an upper gland, an annular oil cup, a transparent cylinder and a lower gland, wherein the annular oil cup is of an annular structure with a hollow cross section at the middle part being U-shaped, the outer ring end surface of the annular oil cup is provided with a positioning mounting ring which is convex outwards and is arranged between the upper gland and the transparent cylinder, and the positioning mounting ring is provided with a plurality of air circulation holes which are radially penetrated; one end of the transparent cylinder body, which is far away from the annular oil cup, is supported on the lower gland, and the upper gland and the lower gland are fixedly connected through a screw rod; the transformer oil is filled in the annular oil cup, the transparent cylinder below the annular oil cup is filled with allochroic silica gel, one end of the lower press cover, which is far away from the transparent cylinder, is connected with the cover of the transformer, and the lower press cover is provided with a through hole so that the interior of the transformer is communicated with the interior of the transparent cylinder. With this desiccator direct mount on the transformer case lid, solved the technical problem that can't install the desiccator on the current transformer case lid.

Description

Box top mounting type moisture absorber for transformer

Technical Field

The utility model belongs to the technical field of the liquid immersion transformer, concretely relates to box top installation formula desiccator for transformer.

Background

The liquid-immersed transformer is filled with transformer oil, and when the transformer runs, the temperature of a transformer winding and an iron core changes along with the change of the load and the external environment temperature, so that the volume of the transformer oil changes along with the change of the temperature, namely the pressure in the transformer oil tank changes, and the problem that the oil tank is expanded due to the increase of the pressure is solved. There are currently two solutions: the transformer radiating fin adopts an expandable corrugated sheet as a buffer for oil expansion. The disadvantages of the scheme are as follows: when the expansion volume of the oil is larger than that of the corrugated sheet, the oil tank is broken by expansion or the oil is sprayed outwards through the release valve, so that accidents are easily caused. And secondly, an oil storage cabinet is additionally arranged above the transformer, half transformer oil is filled in the oil storage cabinet, the upper half part of the oil storage cabinet is an air gap, the lower part of the oil storage cabinet is communicated with an oil tank of the transformer, the air part at the upper part of the oil storage cabinet is communicated with a moisture absorber, and the oil expands and contracts and breathes through the moisture absorber to ensure the safety of the oil tank. The disadvantages are as follows: the prior moisture absorber is of a bottom-mounted type, namely, a bent pipe is arranged above the oil conservator, the direction of an interface is changed to be downward, and then the bent pipe is connected with the moisture absorber. Although the oil expansion problem can be solved by the scheme, an oil storage cabinet needs to be added, and the problems of labor waste, time waste and cost increase are solved.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a box top mounting type moisture absorber for a transformer, which is directly mounted on a transformer box cover, thus solving the technical problem that the moisture absorber cannot be mounted on the existing transformer box cover; meanwhile, the breathing structure replaces an expansion type corrugated sheet structure, so that the condition that the transformer is burnt out due to oil leakage caused by expansion and breakage of an oil tank is effectively avoided.

The utility model discloses a realize through following technical scheme: a box top mounting type moisture absorber for a transformer comprises an upper gland, an annular oil cup, a transparent cylinder and a lower gland, wherein the annular oil cup is of an annular structure with a hollow middle part and a U-shaped cross section; one end of the transparent cylinder body, which is far away from the annular oil cup, is supported on the lower gland, and the upper gland and the lower gland are fixedly connected through a screw rod; transformer oil is filled in the annular oil cup, the transparent cylinder body below the annular oil cup is filled with allochroic silica gel, one end of the lower press cover, which is far away from the transparent cylinder body, is connected with the cover of the transformer box, and the lower press cover is provided with a through hole so that the interior of the transformer is communicated with the interior of the transparent cylinder body; an annular groove with an L-shaped section is arranged below the upper gland, the positioning mounting ring is clamped in the annular groove, the air circulation hole is integrally positioned in the annular groove, the side walls of two sides of the annular groove are not contacted with the positioning mounting ring, and the oil level of the transformer oil is higher than the port of the inner side groove of the annular groove.

Further, the lower gland is in threaded connection with the transformer tank cover through a base nut.

Furthermore, the inner ring and the outer ring of the base nut are both provided with threads, and the inner threads of the base nut are matched with the outer threads on the lower gland; the external thread of the base nut is matched with the internal thread on the transformer tank cover.

Furthermore, an annular groove with an L-shaped section is arranged below the upper gland, the positioning mounting ring is clamped in the annular groove, the whole air circulation hole is positioned in the annular groove, and the side walls of two sides of the annular groove are not contacted with the positioning mounting ring.

Furthermore, the free end of the screw rod above the upper gland is connected with a compression nut.

Further, the transparent cylinder is made of glass.

When transformer oil is cooled and sucked, external air enters through the air flow through hole of the annular oil cup, the external air is filtered through the transformer oil and the allochroic silica gel, and the external air enters the inside of the transformer after moisture in the air is filtered; the path is reversed on expiration.

The utility model has the advantages that: 1. the invention has the advantages of simple and reasonable structure, low manufacturing cost, convenient installation and the like;

2. the moisture absorber is directly arranged on the transformer box cover, so that the technical problem that the moisture absorber cannot be arranged on the existing transformer box cover is solved;

3. the breathing type structure replaces the expansion type corrugated sheet structure, so that the situation that the transformer is burnt out due to oil leakage caused by the expansion and the breakage of an oil tank is effectively avoided;

4. an oil storage cabinet is omitted, and the manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

fig. 3 is a schematic view of the installation of the present invention;

in the figure, the transformer oil tank comprises a pressing nut 1, a pressing nut 2, a screw rod 3, an upper pressing cover 3-1, an annular groove 4, an annular oil cup 4-1, a positioning mounting ring 4-2, an air flow through hole 5, transformer oil 6, a transparent cylinder 7, allochroic silica gel 8, a lower pressing cover 9, a base nut 10 and a transformer tank cover.

Detailed Description

The invention will be further explained below with reference to the drawings and examples.

As shown in fig. 1 to 3, a transformer tank top-mounted moisture absorber includes an upper gland 3, an annular oil cup 4, a transparent cylinder 6 and a lower gland 8, wherein the annular oil cup 4 is an annular structure with a hollow central section and a U-shaped cross section (i.e. the annular oil cup 4 is formed by rotating the U-shaped structure 360 ° around an axis outside the U-shaped structure and parallel to the direction of the U-shaped opening, a hollow structure is formed in the central section of the rotating body, the hollow structure is for air circulation), a positioning mounting ring 4-1 protruding outwards is arranged on an outer ring end surface of the annular oil cup 4, the positioning mounting ring 4-1 is arranged between the upper gland 3 and the transparent cylinder 6, a plurality of radially-penetrating air flow holes 4-2 are arranged on the positioning mounting ring 4-1, so that external air can flow into the annular oil cup 4 through the air flow holes 4-2, then flows to the inside of the transparent cylinder 6 from the hollow structure in the middle of the annular oil cup 4, or vice versa, the gas in the transparent cylinder 6 can be led to the atmosphere from the air through hole 4-2; one end of the transparent cylinder 6, which is far away from the annular oil cup 4, is supported on a lower gland 8, and the upper gland 3 and the lower gland 8 are fixedly connected through a screw 2; the free end of the screw rod 2 above the upper gland 3 is connected with a compression nut 1, and the compression nut 1 is matched with the screw rod 2 to fix the upper gland 3, the annular oil cup 4, the transparent cylinder 6 and the lower gland 8 into a whole. The transformer oil is filled in the annular oil cup 4, the transparent cylinder 6 below the annular oil cup 4 is filled with allochroic silica gel 7, the allochroic silica gel 7 is arranged in the transparent cylinder 6 through a breathable silk screen, one end of the lower gland 8, which is far away from the transparent cylinder 6, is connected with the transformer tank cover 10, the lower gland 8 is in threaded connection with the transformer tank cover 10 through a base nut 9, the inner ring and the outer ring of the base nut 9 are both provided with threads, and the inner thread of the base nut 9 is matched with the outer thread on the lower gland 8; the external thread of the base nut 9 is matched with the internal thread on the transformer tank cover 10. The lower gland 8 is provided with a through hole so that the interior of the transformer is communicated with the interior of the transparent cylinder 6. The transparent cylinder 6 is made of glass. As shown in the air path in fig. 3, an air gap of 3cm is reserved at the upper part in the transformer oil tank, when the transformer oil cools and inhales, external air enters through an air through hole 4-2 of an annular oil cup 4, the external air is filtered through two channels of transformer oil 5 and allochroic silica gel 7, and the external air enters into the transformer after moisture in the air is filtered; the path is reversed on expiration. Allochroic silica gel 7 is mostly blue or white granule, and allochroic silica gel 7 turns yellow along with water content's rising colour gradually, sees through transparent barrel 6 and can observe the colour change of allochroic silica gel 7, treats that allochroic silica gel 7 changes to change allochroic silica gel 7 after turning yellow promptly, and the moisture when avoiding influencing follow-up outside air flow to transformer inside filters.

An annular groove 3-1 with an L-shaped section is arranged below the upper gland 3, the positioning mounting ring 4-1 is clamped in the annular groove 3-1, the air through hole 4-2 is integrally positioned in the annular groove 3-1, the side walls of the two sides of the annular groove 3-1 are not contacted with the positioning mounting ring 4-1, and the oil level of the transformer oil 5 is higher than the inner side groove port of the annular groove 3-1. The side walls of the two sides of the annular groove 3-1 are not in contact with the positioning mounting ring 4-1, so that the air circulation inside and outside the air through hole 4-2 is not influenced, and the air through hole 4-2 is integrally positioned in the annular groove 3-1, so that rainwater and the like are prevented from entering the annular oil cup 4 from the air through hole 4-2. The oil level of the transformer oil 5 is higher than the port of the inner side groove of the annular groove 3-1, so that the air flowing in from the outside is filtered by the transformer oil 5 and then flows into the transparent cylinder 6 from the middle hollow structure of the annular oil cup 4, and is filtered for the second time by the allochroic silica gel 7.

The moisture absorber is directly arranged on the transformer box cover, so that the technical problem that the moisture absorber cannot be arranged on the existing transformer box cover is solved; meanwhile, the breathing structure replaces an expansion type corrugated sheet structure, so that the condition that the transformer is burnt out due to oil leakage caused by expansion and breakage of an oil tank is effectively avoided.

Claims

1. The utility model provides a top of a case installation formula desiccator for transformer which characterized in that: the oil pump comprises an upper gland (3), an annular oil cup (4), a transparent cylinder (6) and a lower gland (8), wherein the annular oil cup (4) is of an annular structure with a hollow middle part and a U-shaped cross section, a positioning mounting ring (4-1) protruding outwards is arranged on the outer ring end face of the annular oil cup (4), the positioning mounting ring (4-1) is arranged between the upper gland (3) and the transparent cylinder (6), and a plurality of radially-penetrating air circulation holes (4-2) are formed in the positioning mounting ring (4-1); one end of the transparent cylinder body (6) far away from the annular oil cup (4) is supported on the lower gland (8), and the upper gland (3) is fixedly connected with the lower gland (8) through the screw (2); transformer oil (5) is filled in the annular oil cup (4), a transparent cylinder (6) below the annular oil cup (4) is filled with allochroic silica gel (7), one end of the lower gland (8) far away from the transparent cylinder (6) is connected with a transformer box cover (10), and a through hole is formed in the lower gland (8) so that the interior of the transformer is communicated with the interior of the transparent cylinder (6); an annular groove (3-1) with an L-shaped section is arranged below the upper gland (3), the positioning mounting ring (4-1) is clamped in the annular groove (3-1), the side walls of the two sides of the annular groove (3-1) are not contacted with the positioning mounting ring (4-1), and the oil level of the transformer oil (5) is higher than the inner side groove port of the annular groove (3-1).

2. The top-mounted moisture absorber for a transformer tank as claimed in claim 1, wherein: the lower gland (8) is in threaded connection with a transformer tank cover (10) through a base nut (9).

3. The top-mounted moisture absorber for a transformer tank as claimed in claim 2, wherein: the inner ring and the outer ring of the base nut (9) are both provided with threads, and the inner threads of the base nut (9) are matched with the outer threads on the lower gland (8); the external thread of the base nut (9) is matched with the internal thread on the transformer box cover (10).

4. The top-mounted moisture absorber for a transformer tank as claimed in claim 1, wherein: the free end of the screw rod (2) above the upper gland (3) is connected with a compression nut (1).

5. The top-mounted moisture absorber for a transformer tank as claimed in claim 1, wherein: the transparent cylinder (6) is made of glass.

6. The top-mounted moisture absorber for a transformer tank as claimed in claim 1, wherein: the air circulation hole (4-2) is integrally positioned in the annular groove (3-1).