CN204556243U - The common downcomer hermetically-sealed construction of inner pressed hydraulic pressure cover plate - Google Patents

Abstract

The utility model relates to a sealing structure of an internal pressure hydraulic cover plate for a centralized downpipe. A cover plate is placed on the upper end of the concentrated downpipe, a sealing gasket is arranged between the cover plate and the concentrated downpipe, and a The lower surface of the inner cover plate is welded with a connection block, and an internal thread blind hole is opened on the connection block, and a stud bolt is screwed in the internal thread blind hole. The upper surface of the plate is provided with a ring-shaped seal installation groove, the shape of the lower end of the centralized downcomer matches the shape of the seal installation groove, the lower end of the concentrated downcomer is embedded in the seal installation groove, and the stud bolts pass through the backing plate A lock nut is screwed on the stud bolt under the backing plate, and a pressure plate is arranged on the stud bolt between the lock nut and the backing plate. The utility model has the advantages of good sealing effect, high safety performance, reduced labor intensity of workers, simple structure and the like.

Description

Sealing structure of internal pressure hydraulic cover plate for concentrated downpipe

technical field

The utility model relates to a sealing structure of a boiler downcomer, in particular to a sealing structure of an internal pressure water pressure cover plate for a concentrated downcomer.

Background technique

Hydrostatic test is an important means to test the quality of base metal and weld seam in boiler manufacturing. The welding quality of the centralized downcomer on the drum is directly related to the safe operation of the boiler. Due to the low viscosity of water, centralized downcomers of different specifications need to be equipped with hydraulic sealing plates of different specifications for sealing according to different working pressures and test pressures. According to the characteristics of large diameter and wall thickness of downcomers, hydraulic sealing plates need to be large Diameter thick plate. At present, the traditional method of hydraulic test sealing is to determine the hydraulic pressure margin and draw the pipe end margin line according to the size of the pipe diameter and wall thickness before the centralized downpipe hydraulic test. And weld and fix the hydraulic sealing plate assembly, and start the hydraulic pressure. After the water pressure is over, the water pressure margin △L at the pipe end is cut off, the pipe end of the down pipe is machined again, and the utilization rate of the water pressure sealing plate is too low, which causes a lot of waste of pipe materials and welding materials, and increases the labor cost of workers. Labor intensity.

Therefore, the reasonable and economical design of the sealing structure for the centralized downcomer hydrostatic test has become a key to measure whether the hydrostatic test tool is perfect or not.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a sealing structure of an internal pressure hydraulic cover plate for centralized descending pipes with good sealing effect, high safety performance and simple structure.

According to the technical solution provided by the utility model, the sealing structure of the internal pressure hydraulic cover plate for the concentrated downpipe includes a cover plate, a sealing gasket, a connecting block, a stud bolt, a backing plate, a lock nut and a drum; The nozzle with the concentrated downcomer on the drum is set vertically downward, a cover plate is placed on the upper end of the concentrated downcomer, and a gasket is provided between the cover plate and the concentrated downcomer. The lower surface of the cover plate is welded with a connecting block, and an internal thread blind hole is opened on the connecting block, and a stud bolt is screwed in the internal thread blind hole, and a backing plate is placed at the lower end of the concentrated downpipe The upper surface of the upper surface is provided with an annular sealing installation groove, the shape of the lower end of the centralized downcomer matches the shape of the sealing installation groove, the lower end of the concentrated downcomer is embedded in the sealing installation groove, and the stud bolts pass through the backing plate, A lock nut is screwed on the stud bolt under the backing plate, and a pressing plate is arranged on the stud bolt between the lock nut and the backing plate.

The lower surface of the cover plate is provided with a raised portion, and the connecting block is welded on the raised portion.

A handle is fixed on the upper surface of the cover plate.

The gasket is a flexible graphite composite gasket.

The groove width of the sealing installation groove is gradually reduced from top to bottom.

The utility model does not need to add extra hydraulic pressure process allowance when the material preparation of the length of the downcomer is concentrated, and the loss of welding materials and steel plates is reduced. In addition, the cover plate in the utility model is easy to process and is convenient for mass production. And what used sealing gasket in the utility model adopts is a standard part, is easy to purchase, and is convenient to assemble and disassemble. The utility model improves the design of the water pressure sealing structure of the downcomer, not only greatly improves the safety, saves the production cost but also improves the quality of the product. The utility model has the advantages of good sealing effect, high safety performance, reduced labor intensity of workers, simple structure and the like.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the cover plate in the utility model.

Fig. 3 is a structural schematic diagram of the backing plate in the utility model.

Detailed ways

Below in conjunction with specific embodiment the utility model is further described.

The sealing structure of the internal pressure hydraulic cover plate for the concentrated downpipe includes a cover plate 1, a gasket 2, a connecting block 3, a stud bolt 4, a backing plate 5, a lock nut 6, a concentrated downpipe 7 and a drum. 10; the nozzle with the centralized downcomer 7 on the drum 10 is arranged vertically downward, and a cover plate 1 is placed on the upper end of the concentrated downcomer 7, and the outer diameter of the cover plate 1 is the same as the outer diameter of the drum 7 The diameters of the circles are equal, a gasket 2 is provided between the cover plate 1 and the centralized downcomer 7, a connecting block 3 is welded on the lower surface of the cover plate 1 located in the drum 10, and an internal thread blind is opened on the connecting block 3. hole, a stud bolt 4 is screwed in the internally threaded blind hole, a backing plate 5 is placed at the lower end of the centralized downcomer 7, and an annular sealing installation groove 5.1 is opened on the upper surface of the backing plate 5, and the centralized downcomer 7 The shape of the lower end of the lower end matches the shape of the seal installation groove 5.1, and the lower end of the centralized downcomer 7 is embedded in the seal installation groove 5.1, and the stud bolt 4 passes through the backing plate 5, and the stud bolt under the backing plate 5 4 is screwed with a lock nut 6 , and a pressure plate 8 is provided on the stud bolt 4 between the lock nut 6 and the backing plate 5 .

The lower surface of the cover plate 1 is provided with a raised portion 1.1, the diameter of the raised portion 1.1 is smaller than the diameter of the inner circle of the drum 7, and the connecting block 3 is welded on the raised portion 1.1.

A handle 9 is fixed on the upper surface of the cover plate 1 .

The gasket 2 is a flexible graphite composite gasket.

The groove width of the sealing installation groove 5.1 is gradually reduced from top to bottom.

When installing, first adjust the position of the drum 10, place the mouth of the drum 10 with the centralized downcomer 7 downward, and place it vertically, and place the cover plate 1 with two curved handles 9 welded thereon with the flexible graphite composite material. The gasket 2 seals the nozzle of the downcomer (located inside the drum 10). Spot-weld the connection block 3 with internal thread blind holes on the cover plate 1, and place the backing plate 5 on the other nozzle of the machined centralized downcomer 7 (located outside the drum 10), and then connect the connection block The position of the cover plate 1 is fixed by the pretightening force of the stud bolt 4 and the lock nut 6 .

Before the pressure test, it should be checked whether the connecting bolts of each connecting part of the test product are fully assembled and fastened. Check whether the test equipment is sealed before pressing up, clean up the inside of the drum 10 and exhaust the internal air before flushing. As the test pressure of the hydraulic pressure rises, the pressure of the pipe hole cover plate on the downcomer is increasing, which plays a role of complete sealing. After the working pressure is reduced, various inspections can be carried out.

The improved structure of the utility model protects the downcomer because the force of the water pressure cover plate does not directly act on the downcomer. Such a set of sealing structures can be used in hydraulic tests of various types of downcomers of the drum, thereby reducing the production cost.

Claims (5)

1. a common downcomer hermetically-sealed construction for inner pressed hydraulic pressure cover plate, is characterized in that: it comprises cover plate (1), sealing gasket (2), contiguous block (3), stud bolt (4), backing plate (5), set nut (6), common downcomer (7) and drum (10), by on drum (10) with the mouth of pipe of common downcomer (7) in arranging straight down, cover plate (1) is placed with in the upper end of common downcomer (7), sealing gasket (2) is provided with between cover plate (1) and common downcomer (7), contiguous block (3) is welded with at the lower surface of the cover plate (1) being positioned at common downcomer (7), contiguous block (3) offers blind screw hole, stud bolt (4) is bolted with in blind screw hole, backing plate (5) is placed with in the bottom of common downcomer (7), the sealing mounting groove (5.1) of annular is offered at the upper surface of backing plate (5), the bottom shape of common downcomer (7) and the form fit of sealing mounting groove (5.1), the bottom of common downcomer (7) embeds in sealing mounting groove (5.1), and described stud bolt (4) is through backing plate (5), the stud bolt (4) of backing plate (5) below is bolted with set nut (6), stud bolt (4) between set nut (6) and backing plate (5) is provided with pressing plate (8).

2. the common downcomer hermetically-sealed construction of inner pressed hydraulic pressure cover plate as claimed in claim 1, is characterized in that: the lower surface of described cover plate (1) is provided with lug boss (1.1), this lug boss (1.1) is welded with described contiguous block (3).

3. the common downcomer hermetically-sealed construction of inner pressed hydraulic pressure cover plate as claimed in claim 1, is characterized in that: be fixed with handle (9) at the upper surface of cover plate (1).

4. the common downcomer hermetically-sealed construction of inner pressed hydraulic pressure cover plate as claimed in claim 1, is characterized in that: described sealing gasket (2) is flexible graphite combined sealing gasket.

5. the common downcomer hermetically-sealed construction of inner pressed hydraulic pressure cover plate as claimed in claim 1, is characterized in that: the groove width of described sealing mounting groove (5.1) is from top to bottom in reducing setting gradually.