JPS6185597A - Flexible supporting equipment for vertical pump - Google Patents

Abstract

PURPOSE:To ensure the supporting of a vertical pump even when its parts are dislocated owing to thermal expansion or earthquake by arranging spherical support at a floor installation part, a mid-cylinder supporting part and a pipe joint. CONSTITUTION:Spherical supporting parts 10a-d are installed in the floor installation part of a vertical pump fixing a flange 7 to a roof slab 2, the part of fixing a middle cylinder 4a to a middle cylinder supporting part and the part of inserting a delivery pipe 6 to a delivery pipe joint 9. Accordingly, this vertical pump has become a kind of multi-indirect joint structure unaffected by dislocations of respective parts due to thermal expansion. Since middle-cylinder supporting is effected, in addition, earthquake durability is also enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to vertical shaft pumps, particularly liquid metal sodium pumps for pool-type fast breeder reactors. a1 This invention relates to a flexible support device for a thick vertical shaft pump such as a main circulation pump that handles heated liquid.

[Prior Art] Conventionally, for example, in a pool-type fast breeder reactor, the main circulation pump for liquid metal sodium is inserted through the floor called the roof slab, that is, the upward flow opening of the eight furnaces, and It is used by inserting the pump discharge pipe into the piping. The pump device is supported by the roof slab in the downward direction where gravity acts, and an intermediate cylinder support section is provided in the lower intermediate cylinder to prevent sway. The pumping device is therefore supported and fixed by the support at the upper roof slab, the support at the intermediate shell and the bayonet pipe. However, since the liquid being handled is at a high temperature, these supporting parts undergo relative displacement due to thermal expansion, resulting in misalignment of the pump device as a whole. Therefore, if the pump device is rigidly fixed on the roof slab, a reaction force will be generated between the piping inside the furnace or the supporting part at the intermediate shell, which may bend the pump device shell or damage the internal structure of the furnace. There is a risk that things may be damaged, thereby causing an accident.

For this purpose, for example, in France, it is known that a complex support device that utilizes elastic deformation is installed at the Lunos slab, but this known technology does not take earthquake countermeasures into consideration, and therefore supports the intermediate shell. No equipment is provided.

Therefore, as a countermeasure against earthquakes, etc., for those that use an intermediate shell support device that also supports the intermediate shell for vibration isolation,
The known support device that utilizes elastic deformation cannot be applied.

[Object of the Invention] Therefore, the object of the present invention is to provide a structure that has sufficient earthquake countermeasures, can completely follow the displacement of each part due to thermal expansion, and
Therefore, it is an object of the present invention to provide a flexible support device for a vertical shaft pump that does not apply excessive force to the corresponding structure.

[Structure of the Invention] According to the present invention, a floor installation part that supports the pump body;
1st year of middle school! ! In a flexible support device for a vertical shaft pump having an intermediate body support part for steadying the cylinder and a pipe joint part, the floor installation part, the intermediate body support part, and the pipe joint part each have a spherical support part. There is.

[Operations and Effects of the Invention] By providing the spherical bearing in this way, a kind of multi-joint structure is created, and the displacement of each part due to thermal expansion is absorbed by the spherical bearing. No force is generated compared to JK products.Also, since there is an intermediate trunk support part, it has high earthquake resistance.

[Example] When carrying out the present invention, it is preferable that the spherical bearing part of the floor mounting part be sealed with a hollow. With this configuration, when applied to a pool-type fast breeder reactor, the entire supporting portion of the roof slab from which the reactor atmosphere tends to leak can be isolated from the reactor atmosphere, making inspection easier. Furthermore, if the bearing part is made of carbon steel, a highly reliable sliding condition can be obtained even in areas where temperature differences are expected.

Furthermore, it is preferable to provide two spherical bearings at the discharge pipe connection in the furnace. With this configuration, the relatively large displacement of the discharge pipe connection in the radial direction can be sufficiently absorbed. be able to.

FIG. 1 illustrates the drawbacks of a conventional pump device 1 that is rigidly supported on a roof slab 2 of a pool type fast breeder reactor. The pump device 1 is equipped with a motor 3 on its upper part, and the motor 3 is supported by a motor stand 3a and a main INJ 4r, and its main body 4 is rigidly supported by the roof slab 2 via a flange 7. An intermediate cylinder 4a is provided below the main cylinder 4, and is rested by an intermediate cylinder support 8 at an intermediate position 114a. A pump casing 5 is installed at the bottom of the intermediate barrel 4a.
A discharge pipe 6 is provided at the lower part of the pump casing 5. When the pump device 1 is installed, the discharge pipe 6 is fitted into the discharge pipe connection part 9.

During operation, the pipe portion 4b near the flange 7 is rigidly supported, so there is no deformation due to thermal expansion. However, the lower part is deformed as shown by the dashed line, so that the center Fi! o is eccentric as shown by line o1. This eccentric weight is indicated by a code.

Due to such eccentricity, there is a risk that not only the intermediate cylinder 4a and the discharge pipe 6 but also the intermediate cylinder support part 8 and the discharge pipe connecting part 9, which are structures, are damaged.

As mentioned above, the present invention solves the above-mentioned drawbacks by providing a flexible support for the pump device 1.

The present invention will be described in detail below with reference to FIGS. 2 to 4. Components in these drawings that correspond to those in FIG.

According to the present invention, there is a part that supports the flange 7, which is a floor installation part, on the roof slab 2, a part that supports the intermediate ff4/l 3 on the intermediate shell support part 8, and a part that inserts the discharge pipe 6 into the discharge pipe connection part 9. and spherical bearing portions 10a and 10b, respectively.
, 10c, 10d h<sQ'J (the discharge piping 6 is provided twice).

Since each of these spherical bearings is substantially the same in one layer, they will be described with reference to J5 and reference numeral 810 in FIGS. 3 and 4.

FIG. 3 shows a spherical support portion 10 (!-) provided in a portion of the roof slab 2 that supports the 7-9 units 3a.

An outer tube 12 is attached to the roof slab 2 with a base 11 removed using an appropriate number of bolts 13, and the outer tube 12 supports a concave ring 14. This concave ring 14 has an axis of 0
It has a spherical concave surface 14a centered on its axis O on its side. On the other hand, the motor base 3a is provided with a convex ring 15, which has a convex surface 15a that matches the concave surface 14a.

As can be seen in FIGS. 3 and 4, a pin 16 is provided that projects inwardly from the concave ring 14, and the tip of the pin 16 extends into a hole 17 provided in the convex surface 15a of the convex ring 15. This hole 17 and pin 16 are provided to limit relative rotation. It is preferable to assemble the concave ring 14 by dividing it into an appropriate number. Furthermore, the convex surface 15a and the concave surface 14a need to have a hardness difference in order to prevent galling. The other spherical bearings are also constructed substantially in the same manner as described above.

In FIG. 3, 20 is a motor shaft, 21 is a coupling, 22 is a main shaft joint, and 23 is a shaft sealing device.

When the present invention is installed on the roof slab of a nuclear reactor, the supporting device is necessarily large in size to support the entire load of the pump, and is also required to be reliable.

The motor stand 3 is designed to isolate the atmosphere inside the reactor from the outside and prevent, for example, sodium vapor from entering the supporting part.
A shield cylinder 25 is provided between the outer surface of the roof slab 2 and the inner surface of the roof slab 2, and the upper end of the shield 15m25 is taken between the base 11 and the outer cylinder 12, and an O-ring is attached to the lower surface of the shield cylinder 25. 2
6 and sealed.

In addition, a shaft seal V is placed at the lower end via a bellows 27.
It is attached between the base plate 28 and the retaining ring 29 with bolts 31. And on the top surface of the board 28 is an O-ring 3.
0 is provided and is also sealed. Therefore, although the atmosphere inside the furnace reaches the space S around the outer periphery of the shielding shell 25, it does not reach the spherical support 10 or the outside.

By preventing the infiltration of the furnace atmosphere (e.g. sodium vapor) in this way, it is easier to inspect the bearing parts.
There is no need to worry about radioactive contamination.

In this way, ordinary carbon steel can be used as the supporting material, for example, without using rustless copper such as austenitic stainless steel. Carbon steel has better thermal conductivity and a smaller coefficient of thermal expansion than austenitic steel, so deformation can be made relatively small.

For example, when the present invention is implemented in a nuclear reactor, the intermediate support portion and discharge piping inside the reactor are eccentric by several tens of millimeters due to the difference in thermal expansion during the operating state of the reactor. In this case, the main body 4
As shown by a center line 02 in the figure, it pivots on a straight line connecting the centers of the spherical bearings 10a and 10b. In this state, the pump's discharge pipe 6 no longer matches the discharge pipe connection portion 9. However, as shown in FIG. 2, the spherical support portions 100 and 10d can sufficiently absorb this eccentricity lh, and no unreasonable load is applied to the pump body or structures.

[Summary] As described above, according to the present invention, since each part is supported by a spherical bearing part, deformation due to thermal expansion can be followed, and damage to each part can be prevented. In addition, the earthquake-resistant TI4 structure is sufficient.

[Brief explanation of drawings]

Is Figure 1 the conventional Go 1? FIG. 2 is a side view showing an example of a flexible support device for a vertical shaft pump embodying the present invention, and FIG. 3 is an enlarged view of the spherical support shown in FIG. 2. FIG. 1... Pump device 2... Roof slab 6...
Discharge piping 8... Intermediate barrel support part 9... Piping connection part 10.10a, 10b, 10c, 10d...
・Spherical bearing part 1-4・i・Concave ring 15...
・Convex ring patent applicant Koihara Seisakusho Co., Ltd. Figure 2

Claims (2)

[Claims] (1) In a flexible support device for a vertical shaft pump, which has a floor installation part that supports the pump body, an intermediate cylinder support part that rests the intermediate cylinder, and a piping joint part, the floor installation part and the intermediate cylinder support part A flexible support device for a vertical shaft pump, characterized in that the and the piping joint each have a spherical support. (2) The flexible support device for a vertical shaft pump according to claim 1, wherein the spherical support portion of the floor mounting portion is sealed with a bellows.