JPS608528Y2 - Sand protection device for underwater rotating machine - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of a sand protection device attached to an underwater motor or the like.

[Prior art]

FIG. 3 is a sectional view showing a conventional device disclosed in, for example, Japanese Patent Publication No. 47-577.
04 is a shaft sealing device whose one end is fitted to the bracket 101;
105 is an end cover to which the other end of the shaft sealing device 104 is fitted, and is fitted to the end surface of the bracket 101 surrounding the shaft sealing device 104; 106 is fitted to the rotating shaft 103;
Annular tongue piece 10 that can come into contact with the outer peripheral surface of the end cover 105
It is a sand cutter with 6a.

With this configuration, during operation, the sand cutter 106 rotates to shake off approaching sand, dust, etc., thereby preventing solid objects from entering the shaft penetrating portion.

By the way, when assembling, the shaft sealing device 104 is fitted onto the bracket 101, and the end cover 105 is attached to the bracket 10.
1.

Next, the sand cutter 106 is fitted onto the rotating shaft 103, and the annular tongue piece 106a comes into contact with the outer peripheral surface of the end cover 105.

However, the shaft sealing device 104 is fitted into the bracket 101 and the end cover 105, and the shaft sealing device 10 is fitted with the end cover 105.
4, the end cover 105 not only becomes large in size, but also
Due to the large size of the end cover 105 and the thick wall structure of the end cover 105, bolts (not shown) are generally used as a means of connecting the end cover 105 and the bracket 101.
etc. are essential, which increases the number of parts and processing steps and becomes uneconomical. Furthermore, if the contact surface of the end cover 5 with the annular tongue piece 106a wears out due to long-term use, the large end This has various drawbacks, such as not only the cover 105 having to be replaced, but also maintenance such as removing bolts and the like becoming troublesome.

[Summary of the idea]

This invention was made for the purpose of improving this drawback, and includes a rotating shaft supported through a bearing in the center and a fitting part concentric with the rotating shaft on the axially outer side of the upper center. A bracket, a shaft sealing device that is entirely inserted into the inner part of the fitting portion of the bracket, formed by molding a thin plate into a bottomed cylinder with a single diameter, and having an opening at one end of the shaft sealing device. The parts are opposed to each other, and the other end of the bottom side protrudes from the fitting part and is arranged in series with the shaft sealing device, and is supported only by fitting on the inner periphery of the fitting part, and the rotating shaft is centered at the bottom part. an end cover having a penetrating hole; and an annular tongue protruding from the fitting portion of the end cover and contacting the outer peripheral surface on the bottom side, and attached to the rotating shaft on the axially outer side of the end cover. A submersible rotating machine that is equipped with a sand guard made of elastic material, which allows for smaller end covers, simpler configuration, elimination of connecting members such as bolts, easier disassembly and assembly, and improved maintainability. The purpose of this system is to provide a sand protection device.

[Example of idea]

The figures will be explained below.

In FIGS. 1 and 2, 1 is a stator frame of an underwater rotary machine, 2 is a bracket fixed to the stator frame 1 via an end plate 3, and 4 is a bearing 6 attached to the center of this bracket. The rotary shaft 6 is supported by a cylindrical part 6 that protrudes from the outer wall of the central part of the bracket 2, and one end of the shaft sealing device 8 comes into contact with the projection part 16 at the back of the fitting part 7 on the inner side of the cylindrical part 6. The entire sealing device 8 has been inserted.

Reference numeral 9 denotes an end cover of a single diameter made by bending a thin plate into a cylinder shape with a bottom.The end cover 9 is formed to have approximately the same outer diameter as the outer circumferential diameter of the shaft sealing device 8. The outer periphery of the side is fitted into the inner periphery of the fitting part 7.

As is clear from FIGS. 1 and 2, the end cover 9 is supported only by the fitting of the fitting portion 7.

The end cover 9 has one end opening 17 facing and abutting against the end of the shaft sealing device 8, and the entire end cover 9 is arranged in series with the shaft sealing device 8, and the bottom 18 side protrudes from the fitting portion 7. ing.

10 is a hole provided in the bottom part 18 of the end cover 9.

A sand guard 11 is fixed to the rotating shaft 4 on the side of the end cover 9, and is made of an elastic material such as nitrile rubber, and its tip contacts the outer peripheral surface of the end cover 9 on the bottom 18 side. An annular tongue piece 12 is integrally formed.

13 is a thrust bearing, 14 is a thrust disk, and 15 is a can.

In the structure as described above, the end cover 9 is first press-molded from a thin plate and processed into a bottomed cylindrical shape.

When assembling, insert the throw part 1 at the back of the fitting part 7 of the bracket 2.
6, the entire shaft sealing device 8 is first inserted, and then the outer peripheral edge of the cylindrical end cover 9 on the opening 17 side is brought into contact with the shaft sealing device 8 and fitted into the fitting portion 7. .

Here, the entire end cover 9 is located outside in the axial direction in series with the shaft sealing device 8, and the outer peripheral edge on the opening side of the end cover 9 has elasticity due to the press molding of the thin plate. For,
The end cover 9 is supported outside the shaft sealing device 8 only by fitting into the inner peripheral portion of the fitting portion 7.

By the way, it is inevitable that the outer circumferential surface of the end cover 9 will wear out at the contact part with the annular tongue piece 12 due to long-term use. In this case, only the small end cover 9 would be replaced.

[Effect of idea]

As described above, in this invention, an end cover is formed by forming a thin plate into a cylindrical shape with a bottom, and this end cover is arranged in series with a shaft sealing device and fitted into a fitting part. Therefore, the outer circumferential diameter of the end cover can be made extremely small, and the end cover can be significantly downsized and its shape simplified, which has the special effect of making it possible to significantly downsize the underwater rotary machine. Furthermore, since the end cover is supported by the fitting portion only by fitting, the end cover itself can not only be securely attached to the bracket by utilizing the radial elastic force of the cylindrical thin plate, but also The number of parts can be reduced by eliminating the need for bolts to attach the end cover to the bracket, and there is no need for a flange on the end cover for inserting bolts, and there is no need to tap the bracket, increasing productivity. In addition, from this point of view, the end cover and the submersible rotary machine can be significantly downsized.Furthermore, since the opening at one end of the end cover faces the end of the shaft sealing device, , can position the shaft sealing device,
It has the effect of preventing the shaft seal device from falling off from the fitting part with an extremely simple structure, and furthermore, since the end cover is fitted to the fitting part in series with the shaft seal device, the end cover can be prevented from falling off from the fitting part. When attaching and detaching the cover, it becomes possible to handle the end cover completely separately from the shaft sealing device, which not only makes assembly or disassembly work extremely easy, but also makes maintenance easier especially when the end cover is worn out. In addition, only the inexpensive end cover needs to be replaced, which has the effect of making maintenance extremely economical.

[Brief explanation of drawings]

Figures 1 and 2 relate to an embodiment of this invention. Figure 1 is an overall view with a partial cross section, Figure 2 is a sectional view of the main part, and Figure 3 is a sectional view of a conventional device. It is. Note that the same reference numerals in the figures indicate the same parts. In the figure, 1 is a stator frame, 2 is a bracket, 4 is a rotating shaft, 5 is a bearing, 7 is a fitting part, 8 is a shaft sealing device, 9 is an end cover, 10 is a hole, 11 is a sand guard, 12 16 is an annular tongue piece, 16 is a pitched portion, 17 is an opening, and 18 is a bottom portion.

Claims (1)

[Scope of utility model registration request] A bracket that supports a rotating shaft through a bearing at a center portion and has a fitting portion concentric with the rotating shaft outside the center portion in the axial direction, and the bracket is entirely inserted into the inner part of the fitting portion of the bracket. The shaft sealing device is formed by molding a thin plate into a bottomed cylindrical shape with a single diameter, and has one open end facing one end of the shaft sealing device and the bottom side of the other end protruding from the fitting portion. an end cover disposed in series with the shaft sealing device, supported only by fitting on the inner periphery of the fitting portion, and having a hole in the center of the bottom through which the rotating shaft passes; and the fitting in this end cover. A sand guard for a submersible rotary machine is provided with a sand guard made of an elastic body, which has an annular tongue protruding from the end cover and comes into contact with the outer circumferential surface of the bottom side, and is attached to the rotary shaft on the axially outer side of the end cover. equipment.