JPS6060295A - pump equipment - Google Patents

Abstract

PURPOSE:To permit to dismantle or inspect a mechanical seal or bearings without dismantling an impeller by a method wherein a hollow shaft is arranged at the outer periphery of a shaft, to which the impeller is connected, and the hollow shaft is secured to the impeller shaft through a connecting rod while the hollow shaft is supported by bearings. CONSTITUTION:The hollow shaft 4b is arranged at the outer periphery of the shaft 4a, to which the impeller 3b is connected, and the shaft 4a is secured to the hollow shaft 4b through the connecting rod 4c. The sealing section 5, such as the mechanical seal or the like, is arranged between a back surface cover 2 and the hollow shaft 4b. The shaft 4a, to which the impeller 3b is connected, is supported by the bearings 6a, 6b of a bearing tube 6 through the hollow shaft 4b. Accordingly, in case the sealing section 5 of the mechanical seal or the like and the bearings 6a, 6b are to be dismantled and inspected, the shaft 4a can be separated from the hollow shaft 4b by removing the connecting rod 4c. The sealing section 5 and the bearings 6a, 6b may be dismantled and inspected easily by removing the housing 7 and the back surface cover 2 under remaining the shaft 4b in the pump casing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a pump that requires the disassembly and assembly of the pump to be kept to the minimum necessary and to simplify the disassembly and assembly.

[Background of the invention]

The entire structure of a conventional pump of this type is shown in FIG. This pump has been used in a nuclear power plant for a long time, but when disassembling the pump's mechanical seal 5 and bearings 6a and 6b'i, remove the casing 1 and rear cover 2, and then remove the impeller. After removing the oak) 3a, impeller 3b, and back cover 2, the mechanical seal 5 and bearings 6a and 6b will be completely disassembled, and the entire structure will be inspected and replaced. With such a structure, the highly radioactive impeller 3bi is exposed when disassembling and reassembling the pump, which increases radiation exposure and poses a serious problem.

[Purpose of the invention]

An object of the present invention is to enable mechanical seals and bearings to be disassembled and inspected without completely disassembling the impeller.

[The key to the invention]

The present invention solves the problem by separating the shaft of the pump into a shaft that serves the impeller and a shaft that has mechanical seals and bearings, and connects each shaft with a connecting rod. The shaft is provided with a fixing means for fixing the impeller shaft and the hollow shaft, and the hollow shaft is entirely supported by bearings. .

[Embodiments of the invention]

An embodiment of the present invention will now be described with reference to FIG.

In the figure, reference numeral 1 denotes a pump casing with a suction port 1ai opened at the front, and a rear cover 2 is attached to the rear side of the pump casing 1, and an impeller 3b is attached to the rear cover 2.
An fc-connected shaft 4a protrudes through the shaft. The impeller 3b is attached to the shaft 4a by an impeller nut 3a. Axis 4a
A hollow shaft 4b is disposed around the outer periphery of the shaft. The shaft 4a and the hollow shaft 4b are fixed by a fixing means, for example a connecting rod 4c.

A shaft sealing portion 5 such as a mechanical seal is arranged between the back cover 2 and the hollow shaft 4b. Further, the shaft 4a connected to the impeller 3b2 is supported by bearings 6a and 6b of the bearing sleeve 6 via the hollow shaft 4b.

With the above configuration, the shaft sealing part 5 such as a mechanical knob, the bearings 6a, 6b', (when inspecting the separate layer 1, the connecting rod 4
By removing C, the shaft 4a and the shaft 4b1 can be separated. The impeller 3b and the shaft 4b to which the impeller 3b is fully connected remain inside the pump casing 1, and the shaft seal 5 and bearings 6a, 6b can be easily disassembled by removing the rear cover 2 and housing 7. Can be inspected.

Therefore, parts of the pump that have a relatively short lifespan, such as shaft seals and bearings, can be disassembled to the minimum necessary, and the effect of reducing exposure to radiation is extremely small. be.

〔Effect of the invention〕

As explained above, according to the present invention, the pump can be disassembled and
Since assembly can be carried out within a minimum range, disassembly and assembly can be simplified not only for pumps installed in places with poor environmental conditions, but also for other pumps.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional pump, and FIG. 2 is a sectional view of a pump according to the invention. ■ Pump casing, 2... Rear cover, 3b...
- Impeller, 4a...shaft, 4b...hollow shaft, 4C series connecting rod, 6a, 6b...bearing. Figure 1 Figure 2

Claims (1)

[Claims] In a pump device in which a shaft to which an impeller is fully connected protrudes from the back of a pump casing with a suction port fully open at the front, and is supported by a bearing in a bearing tube attached to the back of the pump casing, the shaft to which the impeller is fully connected protrudes. A pump device characterized in that a hollow shaft is disposed on the outer periphery of the pump, a fixing means casing is provided for fixing the impeller shaft and the hollow shaft, and the hollow shaft is supported by the bearing.