CN205580230U - Jumbo size thin wall interface butt joint welded structure - Google Patents

Abstract

The utility model provides a jumbo size thin wall interface butt joint welded structure, between steam turbine low pressure jar steam drain and condenser throat entry, set up the connection middleware of a similar flange structure, be called for short the dummy -flange, it is adj. Tabularly to connect the middleware, steam turbine low pressure jar steam drain and one side welding of being connected the middleware, condenser throat entry and the opposite side welding of being connected the middleware, this kind of butt joint welded structure, can solve the too big welding difficult problem that arouses in wrong limit that the deformation in the jumbo size thin wall interface manufacture process leads to effectively, under the prerequisite of ensuring the quality of products, can reduce and make and the construction degree of difficulty, simple operation.

Description

A large-scale thin-wall interface butt welding structure

technical field

The utility model belongs to the field of manufacturing and installation engineering of condensers of wet-cooling thermal power generating units, and in particular relates to a large-size thin-wall interface butt welding structure.

Background technique

At present, in the wet-cooled steam turbine unit, the exhaust steam of the low-pressure cylinder of the steam turbine enters the throat inlet of the condenser downwards. During the construction of the unit, the throat inlet of the condenser must be connected with the exhaust port of the low-pressure cylinder of the steam turbine at the construction site. . Due to the relatively large size of the throat inlet of the condenser, for a 300MW unit, the size of the throat inlet of the condenser is about 7500X5000mm. For an interface part of this size, there must be a large size deformation during the manufacturing (welding) process. Therefore, in the practice of specific engineering construction, it is necessary to directly connect the exhaust port of the low-pressure cylinder of the steam turbine with the throat inlet of the condenser at the construction site. Since both are large-scale thin-walled interfaces, there is a large amount of dimensional deformation. If the direct butt two interface method is adopted as shown in Figure 1, the horizontal displacement of the upper and lower parts will be large due to the dimensional deformation, and alignment welding will be very difficult, and the construction quality will not be guaranteed.

Utility model content

The purpose of the utility model is to provide a welding structure for two large-sized thin-walled joints that are prone to dimensional deformation when butt jointed by using specific auxiliary connectors.

In order to achieve the above purpose, the utility model provides a large-sized thin-wall interface butt welding structure, including the exhaust port of the low-pressure cylinder of the steam turbine, the inlet of the throat of the condenser, and the connecting intermediate piece. Between the throat inlet of the condenser, there is a connecting intermediate piece similar to a flange structure. The connecting intermediate piece is in the shape of a plate. The exhaust port of the low-pressure cylinder of the steam turbine is welded to one side of the connecting intermediate piece. Connect the other side of the middle piece to solder.

Further, the connecting intermediate piece is made of steel plate.

Further, the connection intermediate piece has a shape similar to a flange, and no flange connection holes are distributed on the outer periphery.

Further, the connecting intermediate piece has the same shape and size as the exhaust port of the low-pressure cylinder of the steam turbine.

Further, the width of the connecting intermediate piece is 20-200 mm, and a carbon steel plate with a thickness of 10-50 mm is selected.

When the utility model is performing butt welding between the exhaust port of the low-pressure cylinder of the steam turbine and the inlet of the throat of the condenser, the connection intermediate piece similar to the flange structure is used for auxiliary construction, which can quickly, conveniently and effectively solve the problems caused by deformation. Soldering problems caused by excessive misalignment.

Description of drawings

Figure 1 is a schematic diagram of the existing interface butt welding structure;

Fig. 2 is a schematic diagram of a welding structure using connecting middleware;

Among them, 1 steam turbine low-pressure cylinder exhaust port, 2 condenser throat inlet, 3 connecting intermediate parts, 4 welding seam

detailed description

The utility model will be further described below in conjunction with accompanying drawing 2. It should be understood that the content described here is only for illustrating and explaining the utility model, and is not intended to limit the utility model.

As shown in Figure 2, the welding structure involved in the utility model includes the exhaust port of the low-pressure cylinder of the steam turbine, the inlet of the throat of the condenser, and the connecting intermediate piece, between the exhaust port of the low-pressure cylinder of the steam turbine and the inlet of the throat of the condenser, Set up a connection intermediate piece similar to a flange structure, referred to as a false flange. The connection intermediate piece is plate-shaped. Welded on one side.

In the process of construction and installation of the utility model, firstly, the corresponding connecting intermediate piece is prefabricated according to the exhaust port of the low-pressure cylinder of the steam turbine. The connecting intermediate piece has the same shape and size as the exhaust port of the low-pressure cylinder of the steam turbine. A certain width is reasonably determined according to the amount of misalignment and deformation between the exhaust port of the low-pressure cylinder and the throat inlet of the condenser during on-site construction. It can be approximately 20-200mm wide, and the thickness can be determined according to the material thickness and thickness required by the welding process. The pressure on the interface is reasonably selected, about 10-50mm is optional. After the manufacturing is completed, the connection intermediate piece has a flange-like appearance, but there are no flange connection holes distributed on the outer periphery; between the exhaust port of the low-pressure cylinder of the steam turbine and the inlet of the throat of the condenser, according to the thickness of the prefabricated connection parts , reserve the corresponding gap distance, the gap distance is equal to the thickness of the connecting middle piece plus twice the welding gap, the welding gap is 1-3mm; the welding groove treatment process is carried out on the upper and lower pipeline interface parts, which is used to connect the middle Welding construction between parts; place the connecting middle part between the exhaust port of the low-pressure cylinder of the steam turbine and the inlet of the throat of the condenser. Weld with the other side of the connecting middle piece; first weld the lower part of the connecting middle piece, use multiple wedge-shaped tools to insert between the connecting middle piece and the contact surface of the throat inlet of the condenser, and adjust the gap to the required welding gap , fix the position of the connecting parts by spot welding, remove the wedge tool for lower welding; after the lower welding is completed, then perform upper welding; weld the upper and lower parts of the connecting middleware inside the interface; remove the excessively long connection inside and outside the interface Middle piece, the distance between the edge of the middle piece and the edge of the weld seam is 10-30mm. In this way, the welding problem caused by excessive misalignment caused by deformation can be quickly, conveniently and effectively solved.

Finally, it should be noted that: the above is only an explanation of the utility model, and is not intended to limit the utility model. Although the utility model has been described in detail, for those skilled in the art, it can still understand the aforementioned Modifications to the technical solutions recorded, or equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (5)

1. large size, thin walled interface docking a Welding Structure, including turbine low pressure cylinder steam drain, condenser throat entrance, Connect middleware, it is characterised in that between turbine low pressure cylinder steam drain and condenser throat entrance, place one and be similar to The connection middleware of flange arrangement, connects middleware plate-shaped, turbine low pressure cylinder steam drain and the side weldering being connected middleware Connect, condenser throat entrance and the opposite side welding being connected middleware.

Welding Structure the most according to claim 1, it is characterised in that connect middleware and be processed into by steel plate.

Welding Structure the most according to claim 1, it is characterised in that connect middleware and there is the shape of similar flange, Periphery is not distributed flange connecting hole.

Welding Structure the most according to claim 1, it is characterised in that connect middleware and have and turbine low pressure cylinder row The shape and size that steam ports is consistent.

Welding Structure the most according to claim 2, it is characterised in that connecting middleware width is 20-200mm, choosing It is the carbon sheet of 10-50mm with thickness.