JPH03295513A - Liquid pump for apparatus - Google Patents

Abstract

PURPOSE:To eliminate the failure of adhesion and welding and the labor of working, and to improve the quality and the cost by providing and forming integrally a projecting part and a rotary shaft guide part on the cover of an impeller, and also, constituting the impeller of a synthetic resin material, embedding a magnetic material, and forming integrally the projecting part and the guide part. CONSTITUTION:An impeller main body 19 is formed in a roughly cap-like shape whose driving side is recessed, and on the opposite side to a blade 18, a ring- shaped magnetic material containing space 20 is provided. In this magnetic material containing space 20, a magnetic material 22 is provided, and an opening of a driving source 8 side is closed by welding, etc., in a tightly closed-up state with a cover 21. On the center part of the driving source 8 side of the cover 21, and on its opposite side, a hemispherical projecting part 21a, and a guide part 21b for supporting a fixed shaft 17 are formed integrally, respectively. Therefore, between the cover 21, and the projecting part 21a and the guide part 21b, loose fitting, etc., are not generated, and at the time of rotation of an impeller 10, a stable rotation which scarcely generates surface waving and vibration, etc., is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid pump for equipment used for tapping hot water in electric water heaters and the like.

BACKGROUND OF THE INVENTION In recent years, electric water heaters that easily dispense hot water by rotating a liquid pump have become mainstream.

Conventionally, in this type of liquid pump, magnets are attached to opposing portions of a drive source such as a motor and an impeller, and the rotation of the drive source is transmitted to the impeller through magnetic coupling via a partition wall.

Then, on the impeller side, the magnet and the rotating shaft of the impeller are fixed to the impeller body by adhesives, welding, etc., and the end of the rotating shaft fixed to the impeller body along with the magnet is still in contact with the partition wall, and the contact part is The impeller was designed to rotate as a fulcrum.

Problems to be Solved by the Invention However, since the impeller is constructed by combining a magnet, a rotating shaft, and a lid in an impeller body, it is particularly difficult to fit the lid and the rotating shaft in the fitted state. When backlash occurred, vibration and noise were generated due to the surface runout of the impeller at the start of operation or when idling. Furthermore, the surface run-out causes irregular loads on the rotating shaft, which causes significant wear at the end.As a result, the gap between the impeller and the casing changes, causing poor liquid discharge and impeller failure. There were problems such as damage caused by hitting the casing.

In addition, when the impeller is exposed to hot water, the adhesion or welding between the impeller body and the magnet comes off due to the difference in thermal expansion coefficient, and the magnet is no longer fixed to the impeller, allowing accurate rotation of the drive source to be transmitted to the impeller. This sometimes resulted in impeller damage.

The present invention solves such conventional problems, and an object of the present invention is to provide a liquid pump for equipment that can always reliably transmit the rotation of an impeller.

Means for Solving the Problem 7゜In order to achieve the above object, the first means for solving the problem of the present invention includes an impeller facing into the liquid passage, a driving source,
A liquid pump having a means for transmitting the rotation of the drive source to an impeller, the impeller having a main body having blades on the non-driving side and a magnetic material storage space on the driving side, and a main body that has a magnetic material storage space inside the impeller. and a lid that closes the drive source side opening of the magnetic material storage space, the lid has a convex portion on the outside that supports the rotation of the impeller, and a rotation guide portion is provided on the inside of the convex portion. It is something that

A second means for solving the problem is that the impeller main body is formed of a synthetic resin material, a magnetic material is embedded therein, and a convex part and a guide part are integrally molded in the impeller main body.

Function As mentioned above, since the convex part and the rotation guide part are integrally formed on the lid of the impeller by the first problem solving means, there is no play between the convex part or the rotation guide part and the lid when the impeller rotates. There is no friction and no abnormal rotation.

Further, according to the second problem solving means, the magnetic material is embedded in the impeller and the convex portion and the rotation guide portion are integrated, so there is no need to fix the magnetic material and the impeller. Further, secondary processing such as fixing the lid is no longer necessary.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 to 3 show an electric water heater and a liquid pump for discharging hot water therefrom. As shown in FIG. 3, in an electric water heater, hot water in a container 2 containing a heating element 1 is
The liquid is forcibly fed to the outlet channel 4 by the liquid pump 3 and discharged from the outlet 6. Note that a check valve 6 is provided in the hot water outlet path 4, and a lid 7 is attached to the container 2.

As shown in FIG.
It is intended to be communicated to. More specifically, the drive side case 12 and the casing 13 are connected in the axial direction with a magnetically permeable partition wall 11 in between. A drive plate 15 is provided in one of the drive-side cases 12 and includes a magnetic material 14 and is directly connected to the drive source 8 . In addition, the casing 13 contains the impeller 1o, and has a suction port 16 in the center of the front.
Each has a discharge port (not shown) in a part of the outer periphery.

The casing 13 naturally constitutes a part of the outlet channel 4.

The impeller 10 is configured to rotate around a fixed shaft 17, and its detailed configuration is as shown in FIG.

That is, the impeller main body (hereinafter referred to as the main body) 19 with the blades 18 formed on the non-drive side has a substantially cap-like shape with the drive side concave, and therefore has a circular magnetic material storage space on the side opposite to the blade forming surface. It has 2o. A magnetic material 22 is disposed inside the magnetic material storage space 20, and the opening on the drive source 8 side is hermetically closed with a lid 21 by welding or the like. A hemispherical protrusion 21a is provided at the center of the lid 21 on the drive source 8 side, and the fixed shaft 1 is provided on the opposite side.
A guide portion 21b for supporting 7 is integrally formed.

Further, the magnetic material 22 provided inside the magnetic material storage space 2o corresponds to the magnetic material 14 on the drive side, and biases the impeller 10 toward the drive source 8 side by the attraction force due to magnetic coupling, and the convex portion 21
a is in contact with the partition wall 11. As the magnetic material 14 on the drive side rotates, the impeller 10 rotates synchronously around the abutting portion of the convex portion 21a as a fulcrum.

In the above configuration, the rotation of the drive source 8 is caused by the magnetic material 14.2.
2 is transmitted to the impeller 1o by magnetic coupling. The impeller 10 sucks the hot water in the container 2 by rotating, sends it to the high water passage 4, and discharges it from the soil water spout 6.

At this time, the impeller 10 is supported by a convex portion 21a and a rotating guide portion 21b that are integrally provided on the lid 21, and the convex portion 21a abuts the partition wall 11 and the boss portion 21a supports the fixed shaft 17. It rotates.

In this way, since the convex part 21a and the guide part 21b are integrally formed on the lid 21 of the impeller 10, the lid 21 and the convex part 21a
Unlike the conventional case, there is no problem with the fitting between the guide portion 21b (rotating shaft portion) and the guide portion 21b (rotating shaft portion). Therefore, when the impeller 1o rotates, stable rotation with less surface runout and vibration can be obtained, and a reliable liquid suction and spout bath with low noise can be achieved.

Note that by using fluororesin as the material of the lid 21, the convex portion 2
The slipperiness and abrasion resistance of 1a, boss portion 21a, and guide 21b can be improved.

Embodiment 2 This embodiment 2 is different from the first embodiment, as shown in FIGS. 4 to 6, in that the impeller is formed of a synthetic resin material, and the convex portion and the guide are embedded with a magnetic material. The main feature is that the parts are also integrally formed. This will be explained in detail below. Note that the same reference numerals are used for the same constituent members as in the first embodiment.

In FIG. 4, 18A is a blade, and on the opposite side from the blade 18A is a substantially circular magnetic pole plate 23, which is in contact with the magnetic pole plate 23.
A substantially circular magnetic material 22A having the same diameter is integrally embedded with a synthetic resin material such as polypropylene or Noryl. A side wall 24 having a hemispherical convex portion 24a at the center is formed on the driving source side. A guide portion 24b for supporting the fixed shaft 17 is provided on the back side of the convex portion 24a and coaxially with the convex portion 24a.

In the above configuration, the magnetic pole plate 23 is provided together with the magnetic material 22A, but it may be formed integrally with only the magnetic material 22A. Note that the operation is the same as in the first embodiment.

In this way, the impeller 1oA is integrated with the magnetic material 22A embedded in the impeller body, which is made of a synthetic resin material. This eliminates rattling of the magnetic material 22A, improves dynamic balance during slow rotation, and eliminates vibration and noise. In addition, since the side wall 24, convex portion 24a, guide portion 24b, etc. of the impeller 10A are integrally formed with resin together with the blade 22A, there is no need for gluing or welding that is conventionally seen, and this type of defect or misfit is avoided. Failure of the impeller 10A due to other factors is also eliminated.

The one shown in FIG. 6 has a convex portion 25a and a guide portion 25b in addition to a magnetic material 22B and a magnetic pole plate 23B. For example, a rotating shaft 26 made of a fluororesin material is embedded in the impeller body and integrally molded, thereby further improving the wear resistance of the impeller 10B.

Moreover, what is shown in FIG. 6 is a magnetic material 22C1 magnetic pole plate 23
After embedding the impeller 1oC in the same manner as described above, the rotary shaft 25 is press-fitted and attached to the impeller 1oC to improve workability and wear resistance.

Effects of the Invention As is clear from the description of each of the embodiments above, the liquid pump of the device of the present invention is formed by integrally providing a convex portion and a rotating shaft guide portion on the impeller cover, so that it is not necessary to use a conventional impeller. There will be no fitting play between the lid and the rotating shaft. Therefore, when the impeller rotates, stable rotation with less surface runout and vibration can be obtained, and reliable liquid transfer is possible with less noise.

In addition, the impeller is made of synthetic resin and embedded with magnetic material,
By integrally forming the convex part and the guide part, for example, even if the impeller is exposed to hot water and subjected to a thermal load, the magnetic material does not shake inside the impeller, and the impeller and the magnetic material are always connected. It rotates as one unit, which provides good dynamic balance during rotation and eliminates vibration and noise. In addition, since the outer frame of the impeller is integrally molded with resin, there is no need for gluing or welding that is conventionally seen, eliminating this type of defect and processing effort, and the resin layer during molding can be replaced with the conventional lid and impeller body. It is possible to achieve significant improvements in terms of both quality and cost.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an impeller in Example 1 of the liquid pump of the present invention, Fig. 2 is a sectional view of a liquid pump incorporating the impeller, and Fig. 3 is a sectional view of an electric water heater incorporating the liquid pump. , FIG. 4, FIG. 5, and FIG. 6 are sectional views of the impeller of Example 2, respectively. 1o...impeller, 22...magnetic material,
18...Blade, 19...Main body (impeller body), 2o...Magnetic material storage space, 21...
...Lid, 21a...Protrusion, 21b...-
...Guide section.

Claims (2)

[Claims] (1) An impeller facing into the liquid passage, a drive source, and a magnetic transmission means for transmitting the rotation of the drive source to the impeller, the impeller having blades on the side opposite to the drive source and blades on the side of the drive source. It consists of a main body having a magnetic material storage space, a magnetic material installed inside the magnetic material storage space, and a lid that closes the drive source side opening of the magnetic material storage space, and this lid supports the rotation of the impeller on the outside. What is claimed is: 1. A liquid pump for equipment, which has a convex portion and integrally has a guide portion that rotates coaxially with the convex portion inside. (2) An impeller facing into the liquid passage, a drive source, and a magnetic transmission means for transmitting the rotation of the drive source to the impeller, the impeller being made of synthetic resin and having blades on the side opposite to the drive source. A liquid pump is a device in which a magnetic material is embedded in the drive source side, and a convex part for rotation support and a rotation guide part are integrally molded.