JPS628397Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a canned pump that can improve mechanical strength and reduce cost.

Canned pumps are well known in which a pressurized fluid is caused to flow through a bored space of a rotor. For example, as shown in Fig. 1, a heavy rotor 1 is fixed to the main shaft 3 at one point by a rotor support pipe 2, and fluid is allowed to flow through the rotor support pipe 2 from the impeller 5 side. It is. However, in this canned pump, there were problems in that the rotor support pipe 2 was not particularly reinforced, its mechanical strength was low, and it was difficult to process the rotor and the main shaft to make them coaxial.

Furthermore, as shown in FIG. 2, for example, there is also a rotor in which a long hollow shaft 4 is press-fitted into the rotor 1 so that fluid flows through the hollow shaft 4. However, in such a canned pump, since the hollow shaft 4 is long, the pipe friction loss of the fluid flowing inside the hollow shaft 4 increases.However, if an attempt is made to reduce the pipe friction loss by increasing the inner diameter of the hollow shaft 4, There was a problem in that the sliding bearing became larger, increased frictional resistance, and became more expensive.

The present invention was made in view of these problems, and an object of the present invention is to provide a canned pump that can improve mechanical strength and reduce costs without increasing the frictional resistance inside the pipe.

In this invention, a plurality of rotor supports are provided in a substantially spiral shape in the middle of a main shaft with an impeller fixed to one end.
The above object is achieved by fixedly supporting the rotor support tube to which the rotor is fixed using these rotor supports.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In the canned pump according to this embodiment, the main shaft 11
A rotor support tube 12 is attached to the rotor support tube 12 via a screw-shaped rotor support 10. That is, the rotor support 10 is provided in a substantially spiral shape on the main shaft 11 and extends over substantially the entire length of the rotor support tube 12. The rotor supports 10 are formed so that the height thereof gradually decreases from one end side to the other end side, and are arranged alternately in opposite directions in the circumferential direction of the main shaft 11. 12 is fixedly supported. A rotor 13 is fixed to the outer peripheral surface of the support tube 12. As a result, the rotor 13
is reinforced from the inner circumferential side. On the other hand, an impeller 14 is attached to one end of the main shaft 11, a stator 16 is arranged on the inner circumferential side of the outer cylinder 15, and a suction port guide 17 and a suction side housing 18 are arranged between the impeller 14 and the outer cylinder 15. This forms a suction side flow path. Note 19
is the suction side cover. Further, a discharge side housing 20 and a discharge side cover 21 are provided at the other end of the main shaft 11, thereby forming a discharge side flow path. Note that 22 is a sliding bearing that supports the end of the main shaft.

Thus, when the impeller 14 is rotated by the rotation of the rotor 13, the fluid is sent out in the circumferential direction. At the same time, the center of the impeller becomes a negative pressure, and the suction side fluid flows into it. The fluid discharged from the impeller 14 is guided by the suction port guide 17 to the rotor struts 10 in the rotor support tube 12, passes between the struts 10, passes through the discharge side housing 19, and flows out to the discharge port.

According to the canned pump having such a configuration, since the rotor support 10 is provided inside the rotor 13, the mechanical strength with respect to the weight of the rotor is improved, and the rotor 13
Contact between the stator 16 and the rotor 13 and imbalance of the rotor 13 can be reliably prevented.

Further, coaxial processing between the outer circumferential surface of both ends of the main shaft 11 and the outer circumferential surface of the rotor 13 can be easily performed by improving the rotor support strength.

Moreover, since the length of the rotor support tube 12 is short,
Unlike the conventional canned pump shown in FIG.
Frictional resistance and the like are not a particular problem. The rotor support 10 extends spirally over almost the entire length of the rotor support tube 12 and serves as a guide vane, and smoothly guides the fluid flowing into the rotor support tube 12 to the discharge side. Reduce energy loss. Furthermore, since the structure is simple, it is easy to manufacture and can be provided at low cost.

As detailed in the above embodiments, in the canned pump according to the present invention, the rotor is supported by the shaft with the rotor support provided in the boring space, so that the frictional resistance inside the pipe is not increased. , mechanical strength can be improved, cost can be reduced, and desired objectives can be achieved.

[Brief explanation of drawings]

1 and 2 are sectional views of main parts showing different conventional examples, FIG. 3 is an overall sectional view showing one embodiment of the present invention, and FIG. 4 is an enlarged view of the main parts of FIG. 3. 10...Rotor support, 11...Shaft (main shaft), 1
2... Rotor support tube, 13... Rotor, 14...
impeller.

Claims (1)

[Scope of utility model registration request] A main shaft rotatably disposed within an outer cylinder, an impeller fixed to one end of the main shaft, a rotor support tube arranged substantially coaxially around the middle portion of the main shaft, and fixed to the outer peripheral surface of the rotor support tube. a stator attached to the outer cylinder and disposed opposite to the rotor; a stator provided approximately spirally on the main shaft and extending over substantially the entire length of the rotor support tube; A canned pump characterized by having a plurality of rotor struts that fixedly support the rotor.