JPS59196994A - Magnetic coupling pump - Google Patents

Abstract

PURPOSE:To reduce noise and vibration by a method wherein a gap is provided between an impeller bearing and the impeller bearing inserting part of a pump impeller to insert an elastic filling member into the gap and keep the concentricity of a pair of impeller bearings. CONSTITUTION:The diameter of the impeller bearing 10 is made smaller than the inner diameter (d) of the impeller bearing inserting part 9-1 by the size 2b. The gap (b) is provided between the impeller bearing 10 and the impeller bearing inserting part 9-1 and the filling member 16 having an elasticity is filled into the gap (b). A pair of impeller bearings 10 are aligned concentrically before the filling member 16 is dried. According to this method, noise, such as knocking sounds or the like, will never be generated between the impeller bearing 10 and the impeller inserting part 9-1 and, further, the pair of impeller bearings 10 are aligned concentrically, therefore, noise, vibration and the like may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetically coupled pump having a structure for driving a bonder via a permanent magnet joint.

Conventional configurations and their problems Conventionally, this type of magnetically coupled pump has a configuration as shown in FIG. 1, as an example. That is, a magnet mounting bracket 3 to which a cylindrical driving permanent magnet 4 is fixed is fixed to the tip of the motor shaft 2 of the drive motor 1. The driving permanent magnet 4
A driven permanent magnet 8, which is magnetically coupled and rotated, is also formed in a cylindrical shape and is placed in the boss portion of the pump impeller 9, and a non-destructive cap 6 is placed on the outside of the driven permanent magnet 8. By attaching the driven permanent magnet 8 to the pump impeller 9 with the mounting screw 7, the end portion of the driven permanent magnet 8 is crimped and fixed to a stepped surface formed on the outer periphery of the pump impeller 9. In addition, the gap 6 allows the liquid to be fed and the driven permanent magnet 8 to
It is designed not to come in direct contact with. Furthermore, a pump chamber 15 is formed by the non-magnetic separator 5 and the casing 14, and the driving permanent magnet 4 is partitioned from the pump chamber 15. An impeller bearing 10 is further press-fitted into the center of the pump impeller 9 and is integrated with the impeller shaft 120 fixed to the casing 14.
The pump impeller 9 rotates around the pump impeller 9. Note that 11 in the figure is a thrust l-bearing fixed to the impeller shaft 12, and 13 is an O-ring. In the magnetically coupled pump having such a configuration, in order to fix the impeller bearing 10 to the impeller bearing insertion portion 9-1, the impeller bearing 10 is press-fitted and fixed. For this reason, when the pump is used with high-temperature water, the expansion coefficient of the synthetic resin of the impeller bearing insertion part 9-1 is generally very thick compared to the sliding material of the impeller bearing 10, so the impeller The bearing insertion portion 9-1 thermally expands and changes from press-fitting to gapping, and the impeller bearing 10 comes out and stagnates in the thrust bearing 11. Further, when the liquid feeding temperature during pump operation decreases, the pump impeller 90 impeller bearing insertion portion 9-1 is compressed by thermal jig (7) and the impeller bearing 10
The fixation with the impeller bearing 10 returns to press-fitting 3, so when it is fixed, the pair of impeller bearings 10 are in contact with the pair of thrust bearings 11, and the thrust bearing 11 of the impeller bearing 10 is fixed.
The sliding resistance against the impeller bearing 10 may become extremely large, causing problems such as the inability to start the pump, or even when the impeller bearing 10 is held in a tight fit due to the high temperature of the liquid being pumped. Noise such as a hitting sound is generated between the insertion portion 9-1 and the insertion portion 9-1.

As a countermeasure for this, in order to prevent the impeller bearing 10 from coming off even under high-temperature water, it is necessary to provide an extremely large press-fitting allowance with the blade 'A''-M receiver insertion part 9-1. The bearing 10 may crack or the impeller bearing insertion portion 9-1 may crack.Furthermore, when a pair of impeller bearings 10 is press-fitted into the impeller bearing insertion portion 9-1, the impeller bearing insertion portion 9-1 may crack. As shown in Fig. 2, due to compressive deformation of 1 and changes over time after press-fitting, the concentricity [W] of the pair of impeller bearings 10 becomes out of alignment by a certain amount, which becomes a major cause of noise and vibration during pump operation. -Mari.

Aspects of the Invention The present invention takes these conventional problems into consideration, and provides a magnetically coupled pump with a low noise and low vibration type in which an impeller bearing is properly fixed in an impeller bearing insertion portion. The purpose is to

Structure of the Invention In order to achieve the above-mentioned object, the present invention is directed to inserting and fixing a pair of impeller bearings into the impeller bearing insertion portion of a pump impeller, in which the impeller bearing and the impeller of the pump impeller A circumferential gap is provided in the bearing insertion part, and the impeller bearing is fixed to the pump impeller by filling the gap with elasticity, and the pair of impeller bearings is configured to maintain concentricity. Based on this configuration, a pump with low noise and low vibration is realized.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Note that in FIGS. 2 and 3, the same members as those in FIG. 1 described above are designated by the same reference numerals. As shown in FIG.
In the configuration press-fitted to -1, the state shown in FIG. 3 occurs when the temperature is high. In other words, if the expansion amount of the impeller bearing insertion part 9-1 when the liquid is sent with high temperature water during pump operation is 2b, then d-2b is at least 2b smaller than the inner diameter d of the impeller bearing insertion part 9-1. The diameter of the impeller bearing 1o is determined.

The gap is filled with silicone rubber 16 all around the circumference as shown in FIG. 4, and the impeller bearing 1o is held in the impeller bearing insertion portion 9-1. Also, before the silicone rubber 16 dries, the impeller shaft 1 of the pair of impeller bearings 1o is
2 penetrates the impeller bearing 100 as shown in FIG.
The impeller shaft 12 is aligned with a simple assembly jig C whose inner diameter is opposite, and the assembly jig C is removed after the silicone rubber 16 has dried.

Therefore, the pair of impeller bearings 1o can be easily assembled concentrically by using a simple assembly jig C.

During pump operation, even if the impeller bearing insertion part 9-1 thermally expands due to high-temperature liquid feeding, the impeller bearing 1o is held by the silicone rubber 16, so it will not come off, and the impeller bearing insertion part 9-1 will not come out. Making noise such as impact sounds between
SL: None.

As is clear from the description of the above embodiments, the present invention provides a method for inserting and fixing the impeller bearing into the pump impeller, and the impeller bearing insertion portion of the pump impeller. A gap is provided in the circumferential direction, and after the gap is fixed to the pump impeller using an elastic filler, concentricity is achieved using a simple assembly jig. Even if there is thermal expansion in the impeller bearing insertion part of the pump impeller due to temperature changes during liquid delivery, the impeller bearing will be Since it is held and does not come off, and the sliding resistance of the impeller bearing against the thrust bearing is kept constant t7, there will be no problem of inability to start the pump. Even when the liquid is being fed at a high temperature, the impeller bearing will not be able to penetrate into the impeller bearing insertion part. Since the impeller bearing is held by the filling rate that increases the impeller bearing insertion portion, no noise such as impact noise is generated between the impeller bearing and the impeller bearing insertion portion. Furthermore, even if the inner diameter of the impeller bearing through which the impeller shaft passes and the diameter of the shaft inserted into the impeller bearing insertion part are out of concentricity, the impeller bearing and the impeller bearing insertion part of the pump impeller may Since the concentricity deviation is absorbed by the gap, there is no need to tighten the precision of concentricity between the inner diameter and outer diameter of the impeller bearing, and costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional magnetically coupled pump, Fig. 2 is a partial longitudinal sectional view of a pump impeller bearing press-fitted to explain the present invention, and Fig. 3 is a longitudinal sectional view of a conventional magnetically coupled pump during thermal expansion. FIG. 4 is a partial vertical cross-sectional view showing the state in which the impeller bearing is fixed to the pump impeller according to an embodiment of the present invention. FIG. It is a partial vertical cross-sectional view of the bearing aligned with the assembly jig. 1... Drive motor, 2... Motor shaft, 4... Drive permanent magnet, 8 Drive permanent magnet, 9...・・・Pump impeller, 9-1... Impeller bearing insertion part, 10-・Blade 2
R1a 1llilt, 16... Silicone rubber. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 13 ) 4 Figure 2 q- to Figure 3 Figure 4 q-/ Anl

Claims (1)

[Claims] The drive part on the motor side and the pump chamber containing the pump impeller are separated by a separator made of a thin non-magnetic plate, and a cylindrical permanent magnet fixed to the prime mover rotating shaft and a cylindrical permanent magnet fixed to the pump impeller are used. The pump impeller is rotated in a non-contact state by the mutual magnetic coupling force of A magnetically coupled pump having an impeller bearing fixed to the pump impeller by an elastic filler with a circumferential gap provided in the impeller bearing insertion portion of the pump impeller.