JPH0774029A - Bag for conservator - Google Patents

Abstract

PURPOSE:To use the bag stably for a long time without damaging the pasted part of a bag body by a method wherein, even when the volume of the bag body is increased or decreased according to a change in the volume of insulating oil inside a conservator body, a deformation stress is not concentrated in the pasted part and strong contact friction or the like is not caused between the bag body and the inside of the conservation body. CONSTITUTION:A bag body 11 which is inserted into a conservator body so as to come into contact with insulating oil is formed by pasting rubberized cloths 12 together. Then, the pasted part 13 of the rubberized cloths 12 is formed at the outer circumference in the axial direction of the bag body 11. In addition, the pasted part 13 is formed in the part of a largest diameter at the outer circumference in the axial direction of the bag body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag for a conservator, which is installed in a conservator connected to a transformer.

[0002]

2. Description of the Related Art Conventionally, a conservator bag formed by sticking a rubberized cloth is inserted into the main body of a conservator that is connected to an insulating oil tank of a transformer to increase or decrease the volume of insulating oil due to temperature changes. It is widely known that a bag for a conservator is formed so as to be absorbed by contraction and expansion.

Then, the bonding portion of the bag for the conservator
(1) is formed at the end (2) in the axial direction as shown in FIG. The bonding at this end (2) is performed by overlapping the upper and lower rubberized cloths (3) with the overlapping portion (4) and the overlapping portion.
It is formed by a rubber-coated cloth for fastening (5) that covers the outer surface of (4). Then, the rubber-coated cloth (3) and the rubber-coated cloth for fastening (5) are usually superposed in an unvulcanized state and vulcanized under pressure to form the bag body (6). .

As described above, when the laminating portion (1) of the rubberized cloth (3) is formed on the end portion (2) in the axial direction of the bag body (6), the rubber is attached to the laminating portion (1). At least the pulling cloth (3) will be located in triple. In addition, when the bonding portion (1) is intended to be reinforced, a reinforcing cloth is fixed to the inner surface of the bag body (6), or a fastening rubberized cloth is attached to the inner surface of the bonding portion (1). In some cases, further fastening may be performed separately from the outer surface.

[0005]

However, when formed in this manner, only the laminating portion (1) in the bag body (6) is thickened, and the laminating portion (1) is hardened, resulting in flexibility. Will be lost. Moreover, the axial end of the bag body (6) is a portion that must always change its shape as the volume of insulating oil in the conservator expands and contracts.

As a result, the bonding portion (1), which is hardened and is less likely to be deformed in shape, protrudes a little outward as shown in FIG. 7 even in the initial stage of use after the bonding is completed. It will be fixed in shape.

Then, the insulating oil increases the volume, and the bag body
When (6) is pressed from the outer surface and the air filling the inside of the bag body (6) is discharged to the outside, it is difficult to change the shape of the bonding part (1), so that FIG. As shown, the bag body (6) further projects outward from the side surface. When the bag body (6) contracts further due to an increase in volume of insulating oil, the shape of the bag becomes hard to be restored, and as shown in FIG. Becomes

In addition, the volume of the insulating oil decreases, and the bag body (6)
When the volume is increased, the increasing force of the volume of the bag body (6) is also applied to the bonding part (1), but the shape is fixed at the bonding part (1) and it is necessary to cope with the expansion. However, the deformation stress concentrates on the cured bonding part (1).

Since the bonding portion (1) projects outward from the side surface of the bag body (6), the bonding portion (1) is formed on the inner surface of the conservator body (7) as shown in FIG. Contact, bag body (6)
Due to the contraction, expansion, etc., the bonding portion (1) in the hardened state is in strong contact with the inner surface of the conservator body (6), resulting in strong friction.

Further, as the bag body (6) contracts and expands,
Hardened bonding part which is the axial end part (2) of the bag body (6)
As shown in FIG. 10, a large number of wrinkles (8) are generated in (1),
As a result of the deformation stress being concentrated on the wrinkles (8), the bag body (6) is easily damaged.

In this way, when strong contact friction is generated with the inner surface of the conservator body (7), or when deformation stress concentrates on the bonding portion (1) as the bag body (6) expands or contracts, this bonding As a result, the joint portion (1) is broken, resulting in airtight leakage of the bag body (6). Conventionally, there have been many cases of damage to the conservator bag due to this breakage.

The present invention is intended to solve the above problems, and prevents the concentration of stress on the bonding portion and the occurrence of hardened strong contact friction between the bonding portion and the inner surface of the conservator body. Then, the conservator bag for a long time,
It is intended to be used in a stable state without damage.

[0013]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention forms a bag main body to be inserted into a conservator main body in contact with insulating oil by laminating a rubberized cloth. The bonded portion of the pulling cloth is formed on the outer circumference in the axial direction of the bag body.

Further, the sticking portion of the rubberized cloth may be formed at the maximum diameter portion on the outer circumference in the axial direction of the bag body.

[0015]

The present invention is formed as described above,
The plurality of rubber-coated cloths forming the bag body are not bonded at the axial end portions of the bag body, but are bonded at the axial outer peripheral portion to form the bonding portion.

Therefore, when the bag main body expands or contracts due to the increase or decrease in volume of the insulating oil in the conservator main body due to temperature change, the deformation of the rubberized cloth due to the expansion or contraction is It occurs at the axial end of the body. However, since the bag main body does not have a bonding portion formed at the axial end, the axial end of the bag main body shown in FIG.
It does not project outward as shown in. Therefore, an unnatural protrusion or the like is not formed on the outside of the formed bag body, and wrinkles are not generated.

When the bag body expands due to the volume contraction of the insulating oil, as shown in FIG. 3, the bag body is smoothly deformed as the bag body expands in volume, and unnatural deformation stress or the like is concentrated. It does not cause wrinkles or wrinkles.

When the volume of the bag body shrinks due to the volume expansion of the insulating oil, as shown in FIG. 4, the axial end portion of the bag body or the outer peripheral portion close to the axial end portion is removed. It deforms naturally and can absorb the volume expansion of insulating oil.

Since the rubber-coated cloth bonding portion of the bag body is formed on the outer periphery in the axial direction, even if the bag body repeatedly contracts and expands as the volume of insulating oil shrinks, It is hardly affected by the deformation caused by the contraction and expansion. Therefore, wrinkles do not occur, excessive stress is applied to the bonding part, and there is no possibility of damage due to repeated strong contact friction with the inner surface of the conservator body. It becomes possible to use it stably throughout.

If the bonding portion is formed on the maximum diameter portion on the outer circumference in the axial direction of the bag body, the maximum diameter portion is deformed due to the influence of expansion and contraction of the bag body. Since there is almost no such thing, it is possible to further stabilize the protection of the bonded portion.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. (11) is a bag body, which is a rubberized cloth (12) coated with nitrile rubber on both sides of a nylon base cloth. Formed by. In another embodiment, the bag body (11) is made of a rubber cloth (12) having a synthetic resin coating and a base cloth made of nylon cloth coated with nitrile rubber.

The rubberized cloth (12) is limited in its forming width to a certain range because of its manufacturing capability. Therefore, when a large conservator bag is to be formed, a plurality of rubberized cloths (12) must be attached to each other. The bonding portion (13) is not formed on the end portion (14) of the bag body (11) in the axial direction, but the outer periphery of the bag body (11) in the axial direction, particularly the bag body (11). It is desirable to form it in the maximum diameter portion.

Then, the axial end portion (1) of the bag body (11) is
In 4), the rubberized cloth (12) is only curved and folded, and the reinforcing rubbered cloth (15) is attached to the inner surface of the folded back end (14) if necessary.

Further, the laminating portion (13) is a rubberized cloth (12) folded back from the axial end portion (14) of the bag body (11).
And the rubberized cloth (12) folded back from the other end (14) in the axial direction, or the rubberized cloth (12) located only in the middle of the bag body (11) are overlapped, A rubber-coated cloth for fastening (16) is attached to each of the inner surface and the outer surface to form the attaching portion (13).

The present invention is constructed as described above. When the bag body (11) is inserted into the conservator body (17) in contact with the insulating oil, the insulating oil expands due to the influence of the outside temperature. If so, the bag body (11) contracts its volume by the amount of expansion of the insulating oil. Further, when the insulating oil contracts its volume, the bag body (11) expands by the amount of the contraction so that the volume inside the conservator body (17) can be always kept the same.

Then, the expansion of the volume of the bag body (11),
It is the portion located at the end 14 in the axial direction that is most susceptible to the change due to the contraction. The axial end portion (14) does not have a bonding portion (13) that easily hardens, and therefore, as shown in FIGS. 2 to 4, even when the bag body (11) is expanded or contracted, Rubberized cloth at the axial end (14)
No deformation protrusion, wrinkles, etc. occur in (12). Further, since no special hardening occurs, stress does not concentrate on the hardening portion.

Further, since the bonding portion (13) is formed on the outer circumference of the bag body (11) in the axial direction, preferably on the maximum diameter part of the outer circumference of the bag body (11) in the axial direction, the bag body (11) is Almost no deformation due to expansion or contraction. Therefore, the deformation stress is not concentrated on the bonding part (13) and the inner surface of the conservator body (17) is not strongly contacted,
It does not cause strong friction. As a result, the bag body (11) can be stably used without being damaged even during long-term use.

[0028]

Since the present invention is configured as described above, even if the volume of the bag body changes in accordance with the volume change of the insulating oil in the conservator body, the deformation stress concentrates on the bonding portion. It does not cause strong contact friction with the inner surface of the conservator body. Therefore, the bag body is not damaged at the bonding portion and can be used stably for a long period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bag body.

FIG. 2 is an enlarged cross-sectional view of an end portion of the bag body.

FIG. 3 is an enlarged cross-sectional view of an axial end portion of the bag body in a state where contraction has started.

FIG. 4 is an enlarged cross-sectional view of an axial end portion in a state where the bag body is further contracted.

FIG. 5 is a plan view of a bag for a conservator.

FIG. 6 is a cross-sectional view of a conventional bag body.

FIG. 7 is an enlarged sectional view of an axial end portion of a bag body of a conventional example.

FIG. 8 is an enlarged cross-sectional view of an axial end portion of a bag body of a conventional example, showing a state in which the bag body has been contracted.

FIG. 9 is an enlarged cross-sectional view of an axial end portion of a conventional bag main body in a state where contraction has progressed further.

FIG. 10 is a surface view of an axial end portion of a conventional bag body.

[Explanation of symbols]

 11 Bag Main Body 12 Rubberized Cloth 13 Laminated Part 14 End 15 Reinforced Rubberized Cloth 16 Fastening Rubberized Cloth 17 Conservator Main Body

Claims (2)

[Claims] 1. A bag body to be inserted into the conservator body in contact with insulating oil is formed by laminating a rubber-coated cloth,
A bag for a conservator, characterized in that the sticking portion of this rubberized cloth is formed on the outer circumference in the axial direction of the bag body. 2. The conservator bag according to claim 1, wherein the rubber-coated cloth laminating portion is formed in a maximum diameter portion on an outer circumference in the axial direction of the bag body.