JP3519842B2 - Magnet driven pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet drive pump in which an impeller for sucking and discharging water is rotationally driven in a non-contact state by using magnetic force.

[0002]

2. Description of the Related Art Conventionally, as this type of magnet drive type pump, for example, a structure shown in FIGS. 2 and 3 is known.

A magnet drive type pump indicated by reference numeral 1 in these figures is a pump housing 4 having a water inlet 2 and a water outlet 3, an impeller 5 rotatably mounted in the pump housing 4, and Pump housing 4
And a motor housing 6 partitioned in a liquid-tight state.

The impeller 5 is rotatably supported by a support shaft 7 fixed to the pump housing 4. The end surface of the impeller 5 on the side of the motor housing 6 has a plurality of intervals in the rotational direction. The magnet 8 is attached integrally.

Further, in the motor housing 6,
An electric motor 9 and a drive disk 10 which is disposed so as to face the pump housing 4 and is rotationally driven by the electric motor 9 are provided, and a plurality of drive disks 10 are provided on the end surface of the drive disk 10 on the pump housing 4 side. Magnet 1
1 are integrally mounted at intervals in the rotation direction.

In the magnet drive type pump 1 as described above, when the drive disk 10 is rotationally driven by the electric motor 9, a moving magnetic field is generated by the magnet 11 mounted on the drive disk 10. The moving magnetic field attracts the magnet 8 mounted on the impeller 5 to impart a rotational force to the impeller 5, and the rotation of the impeller 5 causes water to be attracted from the water intake port 2 into the pump housing 4. At the same time, this water is sent to the outside through the spout 3.

[0007]

By the way, the above-mentioned conventional magnet drive pump 1 has the following problems to be improved.

That is, from the viewpoint of suppressing the wear of the impeller 5 due to the thermal effect during rotation, a gap is provided between the impeller 5 and the support shaft 7, and one of the water sucked into the pump housing 4 is provided. Directing contact between the impeller 5 and the support shaft 7 by cooling the fitting portion between the impeller 5 and the support shaft 7 or by interposing water between the impeller 5 and the support shaft 7. However, if foreign matter is mixed in the water sucked into the pump housing 4 for some reason (for example, piping after the magnet drive pump 1 is installed, When air purging or water filling operation of the system is performed, paint, putty, dust, etc. adhering to the pipes are mixed in the water sucked into the pump housing 4), and these foreign matters and the impeller 5 Is a problem that adheres to both together enter a gap between the lifting axis 7.

In the magnet drive pump 1, as described above, the power of the electric motor 9 as the drive source is transmitted to the impeller 5 in a non-contact state by the attraction force of the magnetic force between the magnets 8 and 11. Therefore, if the adhesion force of the foreign matter increases, the impeller 5 cannot rotate due to the attraction force of the magnetic force.

Further, if the rotation of the impeller 5 is stopped, the supply of water is immediately stopped, which may affect other equipment in the piping system. However, it is necessary to avoid the sudden stop of the impeller 5 as much as possible.

The present invention has been made in view of the above-mentioned conventional problems, and is a magnet that allows rotation of the impeller even when the impeller and the support shaft are attached to each other and their relative rotation is restricted. It is a problem to be solved to provide a drive pump.

[0012]

In order to solve the above-mentioned problems, a magnet-driven pump according to a first aspect of the present invention has a pump housing and an impeller rotatably mounted inside the pump housing. And a support shaft that rotatably supports the impeller, wherein the impeller is rotated by a magnetic force applied from the outside of the pump housing, wherein the support shaft is provided in the pump housing. It is characterized in that it is attached so as to be rotatable.

According to a second aspect of the present invention, in the magnet driven pump according to the first aspect, the frictional resistance between the pump housing and the support shaft is set to be larger than the frictional resistance between the impeller and the support shaft. It is characterized by

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. 1. In the following description, parts common to those in FIGS. 2 and 3 are designated by the same reference numerals to simplify the description.

Reference numeral 20 in FIG. 3 shows a magnet drive type pump according to the present embodiment. The magnet drive type pump 20 includes a pump housing 21 and an impeller 22 rotatably mounted inside the pump housing 21.
And a support shaft 23 that rotatably supports the impeller 22.
And the support shaft 23 includes the pump housing 2
The pump housing 21 has a schematic structure in which the pump housing 21 is rotatably attached to the motor housing 1. The motor housing includes an electric motor 9 and a drive disk 10 on which a magnet 11 is mounted, as in the conventional case. It is configured by being attached to 6.

Next, the details will be described. The pump housing 21 is a disk-shaped partition wall 21a partitioning the motor housing 6 from the motor housing 6 in a liquid-tight manner, and the partition wall 21a is attached to the partition wall 21a. And a cover 21b having a bottom and having a bottom and forming a pump chamber 24 therebetween.

The partition wall 21a and the cover 21b close the opening end of the cover 21b.
1a are abutted with each other, and at positions circumferentially spaced from each other, they are interconnected by a plurality of bolts 25 penetrating the side wall of the cover 21b along the axial direction, and between these abutting surfaces. An O-ring 26 that hermetically closes the gap is interposed.

Further, in the center of the bottom of the cover 21b,
Water supply pipe 2 having a water inlet 27 for sucking water therein
8 is integrally projected, and a water discharge port 29 for discharging water is formed at an appropriate position on the side wall.

Further, the partition wall 21a and the cover 21 are provided.
Bearings 30 and 31 to which the respective end portions of the support shaft 23 are fitted are provided in the center of b, respectively. When the support shaft 23 is made of stainless steel, the bearings 30 and 31 are It is made of ceramics.

The bearing 30 provided on the partition wall 21a has a storage recess 32 formed on the partition wall 21a.
The bearing 31 mounted integrally inside the cover 21b is mounted integrally inside a storage box 34 supported by a plurality of support legs 33 projecting inside the water supply pipe 28 of the cover 21b. ing.

The support shaft 23 is supported so as to be sandwiched between the bearings 30 and 31, and the clearance between the bearings 30 and 31 is almost zero.

The impeller 22 has a hub portion 22a.
Is attached to the carbon lining material 35,
The lining material 35 is attached to the support shaft 23 through the lining material 35, and the inner diameter of the lining material 35 is 35 μm to 45 μ between the lining material 35 and the outer peripheral surface of the support shaft 23.
It is formed to be slightly larger than the outer diameter of the support shaft 23 so as to form a gap of m.

Therefore, in this embodiment, the friction between the support shaft 23 and the bearings 30 and 31 is set to be larger than the friction between the impeller 22 and the support shaft 23, and the normal state is set. In the rotation of the impeller 22, the impeller 22 is rotated with respect to the support shaft 23 while the rotation of the support shaft 23 is stopped.

Also, the partition wall 21a of the impeller 22.
A plurality of magnets 36 are radially embedded in a surface opposed to the magnets 36, and an attraction force by magnetic force is generated between the magnets 36 and the magnets 11 installed in the motor housing 6.

Next, the operation of the magnet-driven pump 20 according to this embodiment having the above structure will be described.

When the electric motor 9 is started, the drive disk 10 is driven.
When is rotated, the attractive force of the magnet 11 attached to the drive disk 10 and the magnet 36 attached to the impeller 22 gives a rotational force to the impeller 22.

When a rotational force is applied to the impeller 22 in this manner, the impeller 22 is relatively rotated with respect to the support shaft 23, thereby sucking water from the water intake port 27 formed in the cover 21b and This water is pressure-fed toward the peripheral wall portion of the cover 21b, and is sent to the outside through the water discharge port 29 formed in the peripheral wall portion.

During such a water feeding operation, a minute gap is formed between the lining material 35 attached to the impeller 22 and the support shaft 23, so that the pump housing 21 is sucked. Part of the water enters the gap to form a thin film between the two, and direct contact between the lining material 35 and the support shaft 23 is suppressed, and the frictional heat between the two is cooled by the water. It

As a result, the abrasion of the lining material 35 of the impeller 22 is suppressed and the impeller 22 is stably rotated.

Then, some foreign matter enters the gap between the lining material 35 and the support shaft 23 together with the water,
When a phenomenon occurs in which the relative rotation of the two is restrained, the rotational force acting on the impeller 22 is changed by the support shaft 2.
Both bearings 30 that support the support shaft 23 via
Since the support shaft 23 acts on the friction surface with 31 to rotate relative to the bearings 30 and 31, the impeller 22 is immediately locked even when foreign matter is mixed between the lining material 35 and the support shaft 23. The rotation of the impeller 22 is prevented from being suddenly stopped.

Therefore, even if the relative rotation between the impeller 22 and the support shaft 23 is stopped, the water is continuously supplied from the pump housing 21, and as a result, other water connected to the piping system is connected. It is prevented that the device is affected.

Since the rotational position of the impeller 22 shifts to the contact portion with the bearings 30 and 31, the mass of the rotating portion increases and the magnet drive pump 20.
However, by detecting this variation, it is possible to detect the occurrence of an abnormality in the magnet-driven pump 20.

Therefore, the magnet drive pump 20
When the abnormality occurs, the operation of the piping system is stopped without affecting other devices, and then the abnormality of the magnet drive pump 20 can be dealt with.

The shapes, dimensions, etc. of the respective constituent members shown in the above embodiment are merely examples, and can be variously changed based on design requirements and the like.

[0035]

As described above, according to the first aspect of the present invention.
According to the magnet drive type pump of the present invention, since the support shaft that rotatably supports the impeller is rotatably supported by the pump housing in which the impeller is housed, the relative rotation between the impeller and the support shaft is achieved. Even if a phenomenon occurs in which the two are blocked by sticking or the like, the relative rotation between the support shaft and the pump housing can ensure the rotation of the impeller.

Therefore, the problems such as the sudden stop of the impeller and the stop of the water supply are solved, and the problems can be prevented from occurring in the magnet drive type pump itself and other equipment of the piping system in which the magnet drive type pump is installed. can do.

According to the magnet drive type pump of the second aspect of the present invention, the friction resistance between the pump housing and the support shaft is made larger than the friction resistance between the impeller and the support shaft, so that the normal operation is performed. Unnecessary rotation of the support shaft in the impeller can be prevented, the rotation of the impeller can be stabilized, and the rotational mass can be prevented from increasing, so that the pump efficiency can be prevented from lowering.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a magnet drive type pump according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing an example of a conventional magnet drive type pump.

FIG. 3 is a vertical cross-sectional view of a main part showing an example of a conventional magnet drive type pump.

[Explanation of symbols]

20 Magnet drive pump 21 Pump housing 22 Impeller 23 Support shaft 30 ・ 31 bearing

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomoaki Kawazu 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (58) Fields investigated (Int.Cl. ⁷ , DB name) F04D 13 / 02

Claims (2)

(57) [Claims] 1. A pump housing, an impeller rotatably mounted inside the pump housing, and a support shaft that rotatably supports the impeller, the magnetic force applied from the outside of the pump housing. A magnet drive pump in which an impeller is rotated, wherein the support shaft is rotatably attached to the pump housing. 2. The magnet drive pump according to claim 1, wherein the frictional resistance between the pump housing and the support shaft is set to be larger than the frictional resistance between the impeller and the support shaft.