JPS5845779Y2 - Lining structure nozzle with pipe expansion - Google Patents

Description

[Detailed explanation of the idea] For equipment that uses high-grade corrosion-resistant materials such as titanium and tantalum, even if the main body can be made of clad material, openings such as nozzles, especially those with a small diameter, will have a lining structure.

In particular, for materials that cannot be welded with dissimilar metals such as titanium or tanker, a lining structure is inevitable because the entire nozzle cannot be made of a corrosion-resistant material.

The present invention can be used for openings such as nozzles with such a lining structure, and is intended to streamline manufacturing and simplify the structure.

A nozzle structure according to the prior art will be explained with reference to FIGS. 1 to 4.

First, FIG. 1 shows an example of a lining nozzle structure for titanium clad equipment.

The main body is made of clad steel consisting of a base metal 1 and a clad material 2, and a nozzle 3 is attached to this main body by installation welding 4.
is attached with a lining sleeve 5 on the inner diameter side, an inner lining 6 on the inner side of the device, and a seat surface lining 7 on the flange seat side with installation welds 8, 9° 10, respectively.

This nozzle is normally fastened to a flange 15 of a pipe 14 via a gasket 13 with bolts 16 and nuts 17.

In this structure, the inner lining 6 is flanged in a cylindrical shape with a knuckle 6a provided at the connection part with the lining sleeve 5, and is connected and attached to the lining sleeve 5 by welding 9 at the tip of the collar.

Next, the structure shown in Fig. 4 will be explained. In this case, the nozzle has piping inside the device, and the attachment of the nozzle 3 to the base material 1 is the same as in Fig. 1. However, since the inner lining 6 has a structure in which the lining sleeve 5 protrudes inside the device, it cannot be exposed and attached to the lining sleeve 5 by circumferential welding, and it cannot be attached to the outer surface of the lining sleeve 5. An inner lining plate 20 is also welded and attached by welding 9.

Further, the lining sleeve 5 has a sleeve thick part 19 through a tapered part 18, and includes a weld 10 between the lining sleeve 5 and the seat surface lining 7 and an attachment weld 9 between the inner lining 6 and the lining sleeve 5. This is also done in this thick portion 19.

However, in the structure shown in Fig. 1, the inner lining 6 has a knuckle portion 6a, so when the equipment starts operating, the lining sleeve 5, inner lining 6, etc. are the first to be heated to the base material 1 of the main body, the nozzle 3, etc. Due to the thermal expansion difference based on the temperature difference, a gap 12 is created between the inner lining 6 and the nozzle 3, the base material 1 of the main body, and the cladding material 2. This occurs in the shape shown in Figure 3.

Note that there is a gap 11 between the lining sleeve 5 and the inner diameter of the nozzle 3, as shown in FIG.

In this lining structure, the lining sleeve 5
If it is more extensible than the nozzle 3, the sheet surface side is fixed by connection with the piping 14, so it extends toward the inside of the device, and a gap 12 is created at the inner lining 6 as shown in FIG. The thermal expansion difference between the lining sleeve 5 and the nozzle 3 is absorbed, and the occurrence of thermal stress is reduced.

However, if the nozzle 3 is more extensible than the lining sleeve 5, the difference in thermal expansion cannot be absorbed, so the thermal stress of the lining material is not reduced much, and the lining material and each attachment weld 8, 9. 10 will be affected.

With the structure shown in Figure 1, the reliability of operation is
The problem lies in the difficulty of molding the inner lining 6 during manufacturing, especially the flange part from the knuckle 6a to the attachment part with the lining sleeve 5.

The inner lining 6 is bent along the curvature of the base material 1 and the cladding material 2 of the main body, and is then subjected to flange processing, which makes molding difficult and requires male and female molds for each size. A particular problem is that the cost of jigs and tools is also large.

Next, in the structure shown in FIG. 4, since the lining sleeve 5 has a thick wall portion 19, the first problem is that the lining sleeve 5 requires a thick material.

This lining sleeve 5 has a tapered part 18 and a thick part 1.
The purpose of providing the welds 9 is to reduce the thermal stress generated in the lining sleeve at the attachment welds 9 and 10, which tend to be a bottleneck in terms of strength.

The inner lining 6 is provided with a contact plate 20 in order to make the attachment weld 9 with the lining sleeve 5 as large as possible.

Considering the deformation of the inner lining 6, this abutment plate 20 has the opposite effect of reducing the deformability and increasing the stress of the lining sleeve 5, which also poses a problem.

The purpose of this invention is to obtain a lining structure in a simpler shape that can absorb the thermal expansion difference and thermal stress between the lining material and the main body or nozzle in openings such as nozzles that are lined with high-grade corrosion-resistant materials such as titanium. That is.

This invention involves expanding the corrosion-resistant lining material at the opening of the nozzle, etc. in equipment made of high-grade corrosion-resistant material such as clad steel, and using a group provided on the nozzle body side to connect the lining material and the nozzle. By absorbing thermal expansion differences and thermal stress, it protects welded parts that tend to become weak points in terms of strength.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 to 7.

First, FIG. 5 shows an overall cross-sectional view of a nozzle according to an embodiment of the present invention.

The lining sleeve 5 is attached to the seat surface lining 7 by an attachment weld 10 in the same manner as in the prior art, but on the inner side of the device, it is bitten into the group 22 attached to the inner side of the nozzle 3 by pipe expansion, and the inner surface It is attached to the lining 6 by an attachment weld 9.

FIG. 6 shows partial details of the inner lining 6 side during operation, and shows the lining sleeve 5 and nozzle 3.
Since the difference in thermal expansion between the inner lining 6, the nozzle 3, and the inner surface of the main body is absorbed and alleviated by the group 22, there is no gap 12 between the inner lining 6, the nozzle 3, and the inner surface of the main body, and the gap 11 on the inner surface of the nozzle 3 is also Since the tube 5 has been expanded and is in close contact with the inner surface of the nozzle 3, it is absent from the initial stage.

In FIG. 7, a backing metal 23 is used to make the mounting weld 9 between the lining sleeve 5 and the inner lining 6 more reliable.
It is inserted into the nozzle 3 after being previously attached to the lining sleeve 5.

With this structure, the mounting weld 9 in this part can reliably weld the entire plate thickness of the inner lining 6.
is highly reliable, and even if the thermal expansion, absorption and relaxation of thermal stress in the group 22 is insufficient, it will not become a strength bottleneck in transmitting the axial force that deforms the inner lining 6.

On the other hand, regarding the expansion of the lining sleeve 5, roller expansion is possible for small diameter nozzles, but in consideration of overall reliability and workability, an elastic material such as rubber or
According to the uniform pipe expansion method using hydraulic pressure, etc., no problems arise in terms of work.

As described above, according to the present invention, even in a nozzle with a lining structure made of high-grade corrosion-resistant material, it is not necessary to form a knuckle part on the lining on the inner surface of the device or to expose it for connection welding with the lining sleeve. A lining structure with high strength and reliability can be obtained.

Therefore, it is not necessary to process the inner lining to expose it, and it is possible to omit jigs such as molds, tools, and molding operations.

This molding work and related work, jigs, and tooling costs account for a considerable portion of the equipment manufacturing cost, for example, in titanium clad equipment, so a significant effect can be obtained in reducing manufacturing costs and shortening the manufacturing process.

In addition, even in the case of a nozzle in which the lining sleeve protrudes due to the piping inside the device, as shown in the prior art, there is no need to thicken the lining sleeve or taper the inner diameter side of the sleeve, reducing material costs. Both processing costs can be reduced.

[Brief explanation of drawings]

1 to 4 show nozzle structures according to the prior art, and FIG. 1 is a vertical cross-sectional view showing one example, FIG.
FIG. 3 is a partially enlarged detailed view, FIG. 4 is a vertical cross-sectional view showing another example, and FIGS. 5 to 7 show examples of the lining structure nozzle combined with pipe expansion according to the present invention. FIG. 5 is a longitudinal sectional view, and FIGS. 6 and 7 are partially enlarged detailed views. 1... Main body base material, 2... Clad material, 3... Nozzle, 4, 8 to 10, 21, 24.
...Mounting welding, 5...Lining sleeve, 6...Inner lining, 7...Seat surface snub, 11.12...Gap, 14
...Piping, 15...Flange, 18.
...Taper part, 19... Thick wall part, 20
...Inner lining backing plate, 22...Group, 23...Backing metal.

Claims (1)

[Scope of utility model registration request] In a nozzle for a device that adopts a lining structure, a group is provided in the nozzle body, a portion of the nozzle portion corresponding to the group of lining material is attached to the nozzle body by pipe expansion, and both ends of the lining material are connected to the inner lining material of the device and the sheet. A nozzle with a lining structure that uses pipe expansion and is characterized by being welded to the surface lining material.