JPS6147320B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to barrel-shaped casings used in turbo compressors and turbo pumps.

[Conventional technology]

A conventional casing of this kind is constructed by integrally connecting a shell 1 and a head flange 2 with bolts 3, as described in Japanese Patent Laid-Open No. 51-8607.
(FIG. 1) A casing constructed in this manner is effective in the case of low pressure, but in the case of high pressure, the bolt diameter becomes very large, and there is a risk that machining and workability will be significantly deteriorated.

In order to eliminate the above disadvantages, there is a method of joining the joint surfaces of the shell 1 and the head flange 2 by welding 4 as shown in Fig. 2, but in this case, thick welding is required and there is no defect. Welding requires a lot of effort. Furthermore, since the shell 1 and the head flange 2 are integrated, final machining is not easy.

Therefore, as shown in FIG.
An O-ring 9 is attached to the shell 1 and the head flange 2 via a holder 10 in order to integrally connect the head flange 2 with the shell 1 and the head flange 2, and to prevent leakage to the outside.
A means for attaching each of a and 9b has been proposed.

[Problem that the invention seeks to solve]

By the way, in the above means, the O-ring holder 10 is fixed to the shell 1, and the O-rings 9a and 9a are provided between the shell 1 and the O-ring holder 10 and between the head flange 2 and the O-ring holder 10, respectively.
9b, the pressure in these two O-rings 9a and 9b acts as an axial force on the O-ring holder 10, so the holder rigidity and bolt strength must be strong enough to withstand this axial force. . If the holder rigidity and bolt strength are insufficient, the sealing performance will deteriorate. Furthermore, when replacing the O-ring, it is necessary to disassemble the head flange 2, which deteriorates maintainability.

Furthermore, it is not easy to attach the bolt 8 from the inside of the shell 1, and there is a risk that the bolt 8 may fall off during use, resulting in poor workability.

In view of the above, it is an object of the present invention to increase the rigidity of the O-ring holder to ensure sealing and to improve workability and maintainability.

[Means for solving problems]

The above purpose is to provide a protrusion provided inside the shell,
In a casing formed by joining the shoulders provided on the head flange and joining them together, a positioning pin is provided on the joint surface on the inside of the shell at the joint, and a notch is provided on the other joint surface. This is achieved by pressing the O-ring and inserting the protrusion of the O-ring holder which is bolted to the shell and head flange.

[Effect]

With the above configuration, when internal pressure acts on the shell and head flange, the head flange tends to be pressed in the axial direction, but this pressing force is firmly restrained by the O-ring, O-ring holder, and bolt. Also, although the internal pressure tends to cause the shell to expand in the radial direction, this expansion force is restrained by the O-ring holder and the bolt. This ensures a secure seal. Furthermore, by removing only the O-ring holder, the O-ring can be easily replaced and maintainability is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 4 and 5, 1 is a shell provided with a protrusion 5 on the inside, 2 is a head flange integrally connected to the shell 1, and has a shoulder 6 that joins the protrusion 5 of the shell 1. It is. Reference numeral 13 denotes a dowel pin embedded in the vertical surface 11 of the protruding portion 5 of the shell 1 which is joined to the vertical surface of the shoulder portion 6 of the head flange 2;
Reference numeral 4 denotes a guide hole provided in the vertical surface of the shoulder 6 of the head flange 2, and a dowel pin 13 for positioning is inserted into this guide hole 14.

15 is a notch provided in the horizontal surface 12 of the shoulder 6 provided on the head flange 2; 16 is the notch 1;
O-ring inserted into 5, 17 is the notch 1
5 and presses the O-ring 16.
7a, this holder 17
The structure is fixed to the shell 1 and the head flange 2 by bolts 18 and 19, respectively, so that the rigidity is high.

This embodiment has the above-mentioned configuration, and when internal pressure acts on the shell 1 and the head flange 2, the head flange 2 is pushed to the right in FIG. 5, and at the same time the shell 1 is expanded in the radial direction. Do it like this. However, the pressing force of the former is firmly restrained by the O-ring 16, the O-ring holder 17, and the bolts 18, 19, and the stretching force of the latter is firmly restrained by the O-ring holder 17 and the bolts 18, 19.
is strongly restrained. Also bolts 18, 19
By tightening, the protruding part 5 of the shell 1 is attached to the shoulder part 6 of the head flange 2 via the knock pin 13.
Since the shell 1 and the head flange 2 are held by the O-ring holder 17, the shell 1 and the head flange 2 can be positioned.

Furthermore, when replacing the O-ring, use the O-ring holder 1.
This can be done by removing 7, which improves maintainability. Moreover, since the shell and head flange can be assembled by simply inserting the dowel pin 13 into the shell guide hole 14 with the dowel pin 13 attached to the head flange in advance, the work efficiency is improved.

In this embodiment, the notch 15 for inserting the O-ring 16 is provided on the head flange 2 side, but the same effect can be obtained by providing the notch 15 in the protrusion 5 of the shell 1 instead. can.

〔Effect of the invention〕

As explained above, according to the present invention, by tightening the O-ring holder, the O-ring can be fixed and fixed to the head flange, and the rigidity of the O-ring holder can be sufficiently increased. Therefore, sealing performance is improved. Furthermore, since the O-ring can be replaced without disassembling the head flange, maintainability is improved.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views showing how the shell and head flange are connected in a conventional barrel-shaped casing, Figure 4 is a cross-sectional view showing an embodiment of the barrel-shaped casing of the present invention, and Figure 5 is the same. FIG. 3 is an enlarged detailed view of the main part of the embodiment. 1...Ciel, 2...Head flange, 13...
...Knot pin, 15...Notch, 17...O-ring holder.

Claims (1)

[Claims] 1. In a casing formed by joining and integrally connecting a protrusion provided on the inside of the shell and a shoulder provided on the head flange, a positioning pin is provided on the joint surface of the joint on the inside of the shell, The other joint surface is provided with a notch, and the O-ring is pressed and the protrusion of the O-ring holder, which is fixed to the shell and head flange with bolts, is inserted into the notch. Barrel-shaped casing.