JPH04123887A - Welded structural metal vessel, sheath for gas insulating opening/closing device and tank for gas insulating transformer - Google Patents

Abstract

PURPOSE:To improve working efficiency by joining a barrel tube and a branch tube with arc welding and joining each part of the barrel tube and the branch tube and flanges with laser beam welding. CONSTITUTION:In a welded structural metal vessel, the metal-made barrel tube 2, the branch 3 joined as branching from the axial direction thereof and the flanges 4a, 4b joined to each end parts of the branch tube 3 and the barrel tube 2, are arranged. Further, each joined part is weld-joined. Then, the barrel tube 2 and the branch tube 3 are joined with the arc welding. Further, each end part of the barrel tube 2 and the branch tube 3 and the flanges 4a, 4b are joined with the laser beam welding. By this method, the mechanical processing efficiency is improved and cost of the material is reduced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a welded structure metal container, a sheath for a gas insulated switchgear, and a tank for a gas insulated transformer. The present invention relates to a welded structure metal container, a sheath for a gas insulated switchgear, and a tank for a gas insulated transformer, which are suitable for those formed using a welded structure.

[Conventional technology]

In conventional welded metal containers, such as pressure vessels, it is necessary to join the flange to the end of the melter, and arc welding is known as a method for this joining.

However, this arc welding requires full penetration welding to ensure airtightness, and if greater precision is required, it is necessary to machine the flange surface after welding.

On the other hand, an example of a method using laser welding when joining a pipe and a flange is disclosed in Japanese Patent Application Laid-open No. 59189092, for example.

[Problem to be solved by the invention]

The above-mentioned conventional technology, especially Japanese Patent Application Laid-Open No. 59-189092, is an example of providing a work method in which the method for joining a flange and a pipe (hereinafter referred to as bile duct) is simply changed from arc welding to laser welding. , there is no consideration given to the structure and manufacturing method of the actual metal container, and there are many commonly used metal containers with branch pipes, especially those used in gas-insulated switchgear sheaths. Things are not considered at all. For this reason, arc welding is still mainly used to manufacture metal containers with branch pipes.

However, when the body tube and the flange are welded using arc welding, the flange collapses due to welding heat, making it necessary to apply pre-strain. Therefore, in order to achieve the precision of the container, machining of the flange is required after welding, which requires a large amount of man-hours and has been a problem.

In particular, after welding the branch pipe and bile duct, unless the ends of the branch pipe and body pipe are made with high precision, it will be difficult to join them to the flange, so the ends must be processed. Deformation of the flange is unavoidable, and after welding, it is necessary to maintain accuracy through machining, which poses a major manufacturing problem.

Furthermore, the conventional technology described above does not take into account the fact that when the container becomes large, a large machine is required for flange processing, which reduces the effect of machining before welding. This was a particular problem in the case of large containers.

The present invention has been made in view of the above points, and its purpose is to reduce the number of man-hours even when joining flanges to the body pipe of a metal container having a branch pipe and each end of the branch pipe. It is an object of the present invention to provide a welded structure metal container, a sheath for a gas insulated switchgear, and a tank for a gas insulated transformer, which are obtained by performing welding and joining with high precision without requiring any additional costs. Another object of the present invention is to provide a metal sealed container and flange that are particularly suitable for large containers and can improve machining efficiency.

[Means to solve the problem]

The present invention connects a metal bile duct and a branch pipe that branches from the axial direction of the bile duct and joins them together by arc welding, and laser beam welds the flanges that are joined to each end of the branch pipe and the body pipe. A welded structure metal container formed by joining. A welded structure metal container, wherein at least a joint portion between each end of the bile duct and the branch pipe and the flange is joined by laser beam welding.

A welded structure metal container in which the welded joints are all joined by laser beam welding. A metal formed by welding and joining each end of a metal upper container having a flange at the end with a flange using a laser beam, and each end of a metal lower container which is combined with the upper container and having a flange at the end. Sealed container. A flange in which multiple parts are joined together by laser beam welding, and the planar shape is approximately oval. A metal upper tank, a metal lower tank coupled to the upper tank, and flanges joined by laser beam welding to the ends of the upper and lower tanks, respectively. A gas insulated transformer tank that houses the transformer body with the flanges joined by laser beam welding bolted together and insulating gas sealed inside. The flange has an oval planar shape, and is formed by dividing the flange into a plurality of parts and joining them by laser beam welding. A circuit breaker, a disconnector, a bus bar, etc. are each housed in a sheath filled with insulating gas, and the flanges joined to the ends of the sheath are bolted together, and the flanges joined to the sheath and the ends thereof are connected with bolts. is a sheath for gas insulated switchgear that is joined by laser beam welding. The sheath that accommodates the main bus bar among the bus bars is located below the axis of the breaker, and the sheath and flange that connect the main bus bars, and the sheath that branches almost perpendicularly from the sheath of the main bus bar and connects equipment other than the main bus bar. The gas insulated switchgear sheath is formed by joining the sheath that houses the sheath and the flange by laser beam welding.

[Effect]

In the present invention, when the trunk tube and the branch tube are joined by arc welding, thermal deformation occurs, but after machining this to achieve precision, a flange is attached to each end of the bile duct and the branch tube using a laser beam that minimizes thermal deformation. Since they can be joined by welding, there is no need for machining after the final welding, which reduces the number of man-hours and allows for highly accurate products to be obtained. In particular, the above-mentioned advantages are more remarkable in a sheath constructed by combining a plurality of devices, such as a gas-insulated switchgear.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, in which a body tube 2 and a body tube 2 are shown.
A branch pipe 3 joined by arc welding a substantially perpendicular to the axial direction of The sheath 1 includes a seat 6 and a seat 6, and is used, for example, in a gas-insulated switchgear. In this embodiment, the sheath 1 is constructed by joining the trunk pipe 2 and the flange 4a and the branch pipe 3 and the flange 4 by laser beam welding. In this example, by performing arc welding a before laser beam welding, after absorbing the thermal deformation caused by arc welding,
Since laser beam welding can be performed, a highly accurate sheath 1 can be obtained, and when used in an assembled structure, the effect of improving workability and assembly accuracy can be obtained.

FIGS. 2 and 3 show a second embodiment of the present invention, and similarly to FIG. and a sheath IA constituted by flanges 4a and 4b, a stay 5, and a seat 6, which are respectively joined to the ends of the branch pipe 3. In this embodiment, the trunk pipe 2, the flange 4a, and the branch pipe 3
Laser beam welding 6 is applied to the flange 4b, the body pipe 2, the seat 6, the stay 5, and the joints between the body pipe 2 and the branch pipe 3.
is applied. That is, in the case of the embodiment shown in FIG.
By performing high-precision welding with a laser after absorbing the deformation of arc welding by performing arc welding a first, it is possible to easily provide a high-precision tubular container. However, in the case of the embodiment shown in FIG. 2, the branch pipe 3 is flared in advance, and the trunk pipe 2
Since laser beam welding is applied when the branch pipe 3 is welded to the sheath, the sheath can be formed by low distortion welding that is compatible with automation and has high precision.

The details of the cross-sections of the joints between the flange 4a and the body pipe 2, and between the flange 4b and the branch pipe 3 are shown in FIGS. 4 and 5, respectively. , and the end of the branch pipe 3 and the flange 4b are of course joined by laser beam welding, and the corners are fillet welded from the inside and outside using a laser beam. In this way, the flange 4a.

The collapse of the 4b is also reduced compared to arc welding, and a great effect can be obtained by reducing the pre-straining work, shaping work, post-weld machining work, and workpieces.

Next, using Fig. 6 and Fig. 7, gas insulated switchgear (
An example in which the present invention is applied to a GIS (abbreviated as GIS) will be described.

As shown in the figure, the GIS has a circuit breaker 11° bus bar 12. It is roughly composed of a disconnector 13, a lightning arrester 14, and the like. These units 1- have a structure in which a main circuit conductive part 17 is supported by an insulator 18 in a welded sheath 1 as shown in FIG. 1, and the space is filled with highly insulating SF6 gas. ing.

In addition, each unit has a flange 4 of each sheath 1.
They are connected by bolts or the like via a or 4b. Normally, the container is sealed with SFa gas at 4 to 5 atmospheres, but this only needs to be filled during installation. Therefore, the flanges 4a and 4b of the sheath 1 have
The flatness of the surfaces is such that the adhesion between them is good and the sealing performance of the ring is effectively utilized, and the angle is perpendicular to the sheath that is located below the trunk tube on the wtim of the circuit breaker 11 and covers the conductive part 17 of the main bus bar. It is required that the flange 4b of the branch pipe 3 extending to the main body pipe 2 has a high surface angle with respect to the flange 4a of the body pipe 2. In this embodiment, the body tube and flange of the sheath housing each device and the branch tube and flange are joined by laser beam welding, so the above accuracy can be easily obtained.
The efficiency of assembly work can be improved.

Next, an example in which the present invention is applied to a tank of a gas insulated transformer will be explained based on FIGS. 8, 9, 10, and 11.

As shown in FIG. 11, the tanks of the gas insulated transformer are bolted together at flanges 32 and 32' to which the upper tank 30 and lower tank 31 are joined. The planar shape of the flange 32 is usually an ellipse as shown in FIG. 9, and the mating surface is machined after welding to the upper tank body.

In this embodiment, the flange 32' of the lower tank 31 is divided into four parts as shown in FIGS. 4 and 10.
29) After processing the backing groove 33 in these, the four members are joined by laser beam welding, and also joined to the lower tank body by laser beam welding. In addition, 21 is a ring, 22 is a transformer side plate, 23 is a transformer flange, 24 is a vertical stay, and 25 is a horizontal stay.

According to this embodiment, the flange, which was conventionally machined in one piece with a large machine, can be machined in parts, thereby improving the efficiency of machining and further reducing material costs.

〔Effect of the invention〕

According to the welded structure metal container, the sheath for a gas insulated switchgear, and the tank for a gas insulated transformer of the present invention described above, a bile duct made of metal and a branch pipe branched from the axial direction of the bile duct and joined together. A welded structure metal container formed by joining by arc welding and flanges joined to each end of the branch pipe and the trunk pipe by laser beam welding, at least each end of the trunk pipe and the branch pipe and the A welded structure metal container in which the joint portion with the flange is formed by laser beam welding; a welded structure metal container in which the welded joint portions are all joined by laser beam welding; A metal formed by welding and joining each end of a metal upper container having a flange at the end with a flange using a laser beam, and each end of a metal lower container which is combined with the upper container and having a flange at the end. A sealed container, a flange whose planar shape is approximately oval, with each part divided into multiple parts joined together by laser beam welding, a metal lower tank, and a metal tank connected to the upper tank. the lower tank, and the upper tank,
and flanges that are laser beam welded to the ends of the lower tank, respectively, and the flanges that are laser beam welded to the upper and lower tanks are bolted together, with an insulating gas sealed inside. A tank for a gas insulated transformer that houses a transformer body, the flange having an oval shape in plan view, and a tank for a gas insulated transformer that is formed by dividing into a plurality of parts and joining them by laser beam welding; A circuit breaker, a disconnector, a bus bar, etc. are each housed in a sheath filled with insulating gas, and the flanges joined to the ends of the sheaths are bolted together, and the flanges joined to the sheath and the ends thereof are connected with bolts. is a sheath for a gas insulated switchgear that is joined by laser beam welding, the sheath housing the main bus bar among the bus bars is located below the breaker axis, and the sheath and flange connect the main bus bars; and a sheath for a gas insulated switchgear, which is formed by joining the sheath and flange by laser beam welding, which are branched almost perpendicularly from the sheath of the main busbar and are joined to a sheath that accommodates equipment other than the main busbar. Even if flanges are to be joined to each end of the trunk pipe and branch pipe, it does not require many man-hours to manufacture, and can be achieved by welding and joining with high precision. If applied to a sheath or a tank for a gas insulated transformer, the work efficiency will be further improved.Furthermore, if it is a large container, the machining efficiency can be improved, so the effect is immeasurable.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the welded structure metal container of the present invention, Fig. 2 is a perspective view showing another embodiment of the welded structure metal container of the invention, and Fig. 3 is a cross section of Fig. 2. Figure 4 is a cross-sectional view of the joint between the end of the bile duct and the flange, Figure 5 is a cross-section of the joint between the end of the branch pipe and the flange, and Figure 6 is a gas-insulated switchgear adopting the present invention. A plan view showing , Fig. 7 is a
Fig. 8 is a front view showing the upper tank of the gas insulated transformer, Fig. 9 is a bottom view of Fig. 8, Fig. 10 is a perspective view of the flange adopted therein, Fig. FIG. 8 is a front view showing a transformer tank in which an upper tank and a lower tank are combined, and FIG. 12 is a side view of FIG. 11. 1. IA/Sheath, 2. Trunk pipe, 3. Branch pipe, 4 a
. 4b... flange, 5... stay, 6 seat, 7 bushing, 8... gangway, 9... circuit breaker operator, 1o disconnector operator, 11... circuit breaker, 12 bus bar, 13 disconnector, 14 ・surge arrester , 15.Single-phase busbar, 16..3-phase bracket busbar, 17..Main circuit conductive part, 18.Insulator, 19.
...SFg gas, 20...GiB, 21...O link, 22.Transformer side plate, 23..Transformer flange, 24
・Vertical slur, 25 ・Horizontal slur 26.27, 28.2
9...Flange member, 30 Transformer upper tank, 31...
Transformer lower tank, 32・Upper tank flange, 32'・
Lower tank flange, fig. fig. fig. fig.

Claims (11)

[Claims] 1. It includes a metal body pipe, a branch pipe that branches from the axial direction of the body pipe and is joined to the body pipe, and a flange that is joined to each end of the branch pipe and the body pipe, and each joint is joined by welding. The welded structure metal container is characterized in that the trunk pipe and the branch pipe are joined by arc welding, and each end of the trunk pipe and the branch pipe and the flange are joined by laser beam welding. Welded construction metal container. 2. It includes a metal body pipe, a branch pipe that branches from the axial direction of the body pipe and is joined to the body pipe, and a flange that is joined to each end of the branch pipe and the body pipe, and each joint is joined by welding. What is claimed is: 1. A welded structure metal container comprising: a welded structure metal container, wherein at least a joint portion between each end of the trunk pipe and the branch pipe and the flange is joined by laser beam welding; 3. It includes a metal body pipe, a branch pipe that branches from the axial direction of the body pipe and is joined to the body pipe, and a flange that is joined to each end of the branch pipe and the body pipe, and each joint is joined by welding. 1. A welded structure metal container comprising: a welded structure metal container, wherein the welded joints are all joined by laser beam welding. 4. It consists of a metal upper container having a flange at the end, and a metal lower container coupled to the upper container and having a flange at the end, and the end of each container and the flange are welded together, The welded flanges are bolted together to form a sealed metal container, and the ends of the upper and lower containers and the flanges are joined by laser beam welding. Features a sealed metal container. 5. The end surfaces of the upper and lower containers are approximately oval in shape,
5. The metal sealed container according to claim 4, wherein the flanges that are joined by laser beam welding to the upper and lower containers each having an oval end face shape are formed in a substantially oval shape. 6. A flange characterized by having a plurality of divided parts joined together by laser beam welding and having a substantially oval planar shape. 7. A metal upper tank, a metal lower tank coupled to the upper tank, and flanges welded to the ends of the upper and lower tanks, respectively, the flanges being welded to the upper and lower tanks, respectively. In a tank for a gas insulated transformer that houses the transformer body with the flanges bolted together and the transformer body sealed inside with insulating gas, the ends of the upper and lower tanks and each flange are welded by laser beam welding. A tank for a gas insulated transformer characterized by being formed by joining. 8. A metal upper tank, a metal lower tank coupled to the upper tank, and flanges welded to the ends of the upper and lower tanks, respectively, the flanges being welded to the upper and lower tanks, respectively. In a tank for a gas insulated transformer, the flanges are bolted together and house a transformer body with an insulating gas sealed inside, and the flanges have an oval planar shape and are divided into a plurality of parts. A tank for a gas insulated transformer, characterized in that it is formed by joining two parts by laser beam welding. 9. A metal upper tank, a metal lower tank coupled to the upper tank, and flanges welded to the ends of the upper and lower tanks, respectively, the flanges being welded to the upper and lower tanks, respectively. In a tank for a gas insulated transformer that houses the transformer body with the flanges bolted together and the transformer body sealed inside with insulating gas, the ends of the upper and lower tanks and each flange are welded by laser beam welding. For a gas insulated transformer, characterized in that each flange is formed by being joined together, each of the flanges has an oval planar shape, and the flanges are formed by being divided into a plurality of parts and being joined together using a laser beam. tank. 10. In a sheath for a gas insulated switchgear, which is constructed by housing a disconnector, a disconnector, a bus bar, etc. in a sheath filled with insulating gas, and bolting flanges joined to the ends of the sheath. A sheath for a gas insulated switchgear, characterized in that the sheath and the flange joined to the end thereof are joined by laser beam welding. 11. The sheath that accommodates the main bus bar among the bus bars is located below the breaker axis, and the sheath and flange that connect the main bus bars, and the sheath that branches out almost perpendicularly from the sheath of the main bus bar and are connected to other than the main bus bar. 11. The sheath for a gas-insulated switchgear according to claim 10, wherein the sheath and the flange are joined by laser beam welding to be joined to the sheath housing the equipment.