JPS6036344Y2 - nozzle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle device installed in, for example, a pressure vessel, and particularly to a sleeve structure suitable for reducing thermal shock.

Pressure vessels and drums often require a sudden flow of heating or cooling fluid during operation.

In such cases, thermal stress is generated in the inlet nozzle due to sudden temperature changes, so a thermal sleeve structure is generally used.

FIG. 1 is a sectional view of a main part of a conventional nozzle device.

A sleeve 2 is integrally and concentrically provided inside the nozzle body 1, and a gap 3 is formed between the nozzle body 1 and the sleeve 2.

The sleeve 2 absorbs thermal deformation due to rapid temperature changes on the surface of the nozzle body 1, and the nozzle body 1 and sleeve 2
By causing the fluid to stagnate in the gap 3 formed between the two, heat conduction is reduced and thermal stress in the nozzle body 1 is reduced.

However, in conventional nozzle devices, the nozzle body 1 and the sleeve 2 are integrated, and the temperatures of the nozzle body 1 and the sleeve 2 are different, so stress concentrates on the base 11 of the sleeve 2 and Since thermal deformation is restrained by the nozzle body 1, damage may occur due to thermal fatigue.

Further, the sleeve 2 may be damaged due to long-term thermal effects, and in such a case, the nozzle body 1 must also be replaced with a new one, which is uneconomical.

The object of the present invention is to eliminate the drawbacks of the prior art mentioned above, and to provide a nozzle device that has a long service life and is economical.

To achieve this object, the present invention is characterized in that the nozzle body and the sleeve are separated, and the sleeve is attached to the nozzle body so that the sleeve can be thermally deformed in the radial direction with respect to the nozzle body.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a diagram showing a first embodiment of the present invention.

The flange portion of the nozzle body 1 is vertically divided, and a ring-shaped gasket 5 is interposed between the upper flange portion 4A and the lower flange portion 4B.

The sleeve 3 is composed of a cylindrical portion 6 and a flange portion 7 extending radially outward from one end of the cylindrical portion 6. The flange portion 7 has a long elongated hole 8 along the radial direction of the sleeve 3. Multiple holes are drilled.

The outer diameter of the cylindrical portion 6 is designed to be smaller than the inner diameter of the nozzle body 1, so that when the sleeve 2 is attached to the nozzle body 1, a predetermined gap 3 is formed between the nozzle body 1 and the sleeve 2. ing.

Before joining the upper flange part 4A and lower flange part 4B of the nozzle body 1, the sleeve 2 is attached to the lower flange part 4B of the nozzle body 1 by attaching the flange part 7 of the sleeve 2 to the lower flange part 4B of the nozzle body 1 with screws 9. A gap 3 is formed between the part 6 and the part 6.

Thereafter, the upper flange portion 4A and the lower flange portion 4B are tightened via a gasket 5, but the flange portion 4A is not pressed against the flange portion 7 of the sleeve 2.

Also, since the screw 9 is inserted into the elongated hole 8, the sleeve 2
Expansion and contraction in the radial direction due to thermal effects can be freely performed without being restricted by the nozzle body 1.

FIG. 4 is a diagram showing a second embodiment of the present invention, in which the nozzle body 1
A step portion 10 is formed on the inner peripheral side of the lower flange portion 4B, and the flange portion 7 of the sleeve 2 is attached to the step portion 10 with screws 9.

The radial length of the stepped portion 10 is designed to sufficiently allow thermal expansion of the sleeve 2 in the radial direction.

A predetermined number of elongated holes 8 as shown in FIG. 3 are formed in the flange portion 7 of the sleeve 2, and by forming the step portion 10,
Even if the upper flange portion 4A and the lower flange portion 4B are joined via the flat gasket 5, the upper flange portion 4A
does not come into pressure contact with the flange portion 7 of the sleeve 2.

These allow the sleeve 2 to be thermally deformed in accordance with the temperature of the flowing fluid without being constrained by the nozzle body 1.

FIG. 5 is a diagram showing a third embodiment of the present invention, in which the nozzle body 1
A stepped portion 10 is formed on the inner peripheral side of the upper flange portion 4A, and the flange portion 7 of the sleeve 2 is attached thereto.

FIG. 6 is a diagram showing a fourth embodiment of the present invention.

In this embodiment, a self-tight gasket 5 such as a cone gasket is placed on the inner peripheral side of the joint between the upper flange 4A and the lower flange 4B, and the sleeve 2 is attached to the upper surface of this gasket 5 with screws 9. It is being

The flange portion 7 of the sleeve 2 is provided with a predetermined number of elongated holes 8 as shown in FIG. 3, so that the sleeve 2 is not constrained by the gasket 5 and can easily be thermally deformed in the radial direction.

When a self-tight gasket 5 is used, the internal fluid often comes into direct contact with the gasket 5.
Therefore, the sealing performance of the gasket 5 tends to deteriorate due to the influence of the temperature of the internal fluid.

If the sleeve 2 is arranged from the inner peripheral side to the upper surface side of the gasket 5 as in this embodiment, the gasket 5 can be protected from the internal fluid by the sleeve 2, and high sealing performance can be maintained for a long period of time.

As described in the embodiment, if the nozzle body 1 and the sleeve 2 are separated and the sleeve 2 is fixed to the nozzle body 1 with the screw 9, if the sleeve 2 is damaged, only the sleeve 2 needs to be replaced with a new one. .

The present invention has the above-mentioned structure, and since the sleeve can be easily deformed due to temperature changes without being constrained by the nozzle body, thermal stress on the sleeve is reduced, and a nozzle device with a long service life can be provided. .

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of a conventional nozzle device, Figures 2 and 4 are
5 and 6 are sectional views of essential parts of nozzle devices according to embodiments of the present invention, and FIG. 3 is a partial plan view of a sleeve used in the nozzle devices. 1... Nozzle body, 2... Sleeve,
7...Flange part, 8...Elongated hole, 9.
...screws, 10...steps.

Claims (1)

[Claims for Utility Model Registration] 1. In a nozzle device in which a sleeve is disposed inside a nozzle body, the nozzle body and the sleeve are separate bodies, and the sleeve can be thermally deformed in the radial direction with respect to the nozzle body. A nozzle device characterized in that a sleeve is attached to a nozzle body. 2 Utility Model Registration Claim Paragraph 1 provides that a flange portion is provided at one end of the sleeve, and a long elongated hole is formed in the flange portion along the radial direction of the sleeve. A nozzle device characterized by being attached to the main body.