JPS6230314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a pump vane for a magnet-driven pump.

Fig. 1 is a vertical sectional view showing a conventional magnet-driven pump. In the figure, 1 and 2 are box cases that face each other and form the pump casing, and 3 is an O-ring provided on the joint surface of these. , 4 is a pump blade rotatably provided within the box cases 1 and 2, 5 is a cylindrical driven magnet provided inside the blade, 6 is a pump shaft provided at the center of the blade 4, 7 is a bearing that rotatably supports the pump shaft in the box cases 1 and 2; 8a and 8b are bearings that support the vane 4 and the pump shaft 6 so as to slide on the bearings; 9 is a bearing that supports the driven magnet 5; Opposingly, a cylindrical drive magnet is placed on the outside of the box case 2, 10 is a magnet fixing plate that fixes this drive magnet by press-fit adhesive, 11 is a magnet fixing plate that fixes this magnet fixing plate to the rotating shaft of the electric motor 12. It's Natsuto.

In the magnet-driven pump configured as described above, when the electric motor 12 is rotated, the driving magnet 9 is rotated by the rotational force of the electric motor 12.
As the blade rotates, the driven magnet 5 rotates, rotating the blade 4, sucking in water in the direction of arrow a, and sending water in the direction of arrow b.

The pump blade 4 is provided with a driven magnet 5 inside, and its outer side is covered with plastic. Even if the driven magnet 5 is damaged by an impact, the repulsive force of the magnet magnetized to N.S6 to 8 poles will cause the pump blade to move outward. It prevents you from leaving. Conventionally, the components of this type of pump blade are divided into four parts: a driven magnet, a pump shaft, a bearing, and a resin molded blade, each of which is molded separately and bonded together using ultrasonic bonding or an adhesive. However, if adhesive is used, the adhesive may flow onto the bearing surface, causing abnormal noise in the sliding parts, and if it adheres to the pump shaft surface, it may not be able to enter the mating parts, or the assembly quality may be affected. There were disadvantages such as poor productivity.

In addition, since this type of pump is also used to convey hot water, the blade material is generally made of glass-filled noryl resin, which has high heat resistance.
In the case of repeated rapid temperature changes (for example -20 to +80℃) or continuous high temperatures,
The problem was that the adhesive part could peel off. To prevent this, ultrasonic bonding is performed, but bonding may not be possible depending on the shape of the parts, and in such cases it is unavoidable to use adhesive to bond.

Furthermore, the driven magnet used in this type of pump is a ferrite-based magnet, which has a different coefficient of thermal expansion from noryl resin.
Even when integrally molded, there was a drawback that the outer resin part of the magnet could crack due to heat shock (for example, rapid temperature changes from -20 to +80°C) or continuous high temperatures.

This invention was made in order to eliminate the drawbacks of the conventional products as described above. After forming a specific primary molded product on the pump shaft, a driven magnet is inserted, and then resin is filled through secondary molding. Provides a method for manufacturing pump vanes for magnet-driven pumps, which can be manufactured without using adhesives, does not peel or crack even in the case of heat shock or continuous high temperature, and provides high quality and high productivity. It is intended to.

The present invention involves inserting and fixing one of the bearings and the pump shaft into a mold, filling the mold with resin through the primary molding port, a base that covers the outer periphery of the pump shaft, a cylindrical magnetic guide concentric with the base, and a magnet guide for these parts. A primary molding step of forming a primary molded product having a disc-shaped wing plate connecting each one end portion, and a guide rib extending from the base into the magnet insertion space formed by these, and the magnet guide. An insertion step in which the driven magnet is inserted into the magnet insertion space using the inner surface of the magnet as a guide, and the pump shaft with the primary molded product and the driven magnet installed is inserted and fixed into another mold together with the other bearing, and the secondary molding port is inserted into the secondary molding port. A magnet-driven pump comprising: a secondary molding step of filling the magnet insertion space with resin to form a resin layer surrounding the driven magnet; and a bonding step of ultrasonically bonding another vane plate to the vane plate. This is a method of manufacturing a pump blade for use in a motor vehicle.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 2 is a side view of the primary molded product, Figs. 3 to 5 are sectional views taken along line AA in Fig. 2 at each step, and Fig. 6 shows a driven magnet, where a is a plan view and b is B. -B is a sectional view, c is a side view, and FIGS. 7 and 8 are plan views showing other examples of driven magnets,
In the figures, the same reference numerals as in FIG. 1 indicate the same or corresponding parts.

13 is a rotation prevention groove provided in the pump shaft 6; 14 is a primary molded product; a cylindrical base 15 that covers the outer periphery of the pump shaft 6; a cylindrical magnet guide 16 concentric with this base; one end of each of these. A blade plate 17 extending in a disk shape connecting the parts, a magnet insertion space 18 formed by these, and a base part 1.
5 to the magnet insertion space 18 side, a plurality of guide ribs 2 extend radially leaving a resin inflow space 19.
0, and the magnet insertion space 18 of the blade plate 17
It is composed of a plurality of positioning ribs 21 that extend radially to the side and connect with guide ribs 20. 22
is a U-shaped engagement groove formed at one end of the driven magnet 5 inserted into the magnet insertion space 18;
23 is a resin layer filled in the magnet insertion space 18 including the resin inflow space 19 so as to surround the driven magnet 5;
It covers the opening of the magnet, flows into the groove 22, and engages the driven magnet 5. The guide rib 20 is smaller than the inner diameter of the driven magnet 5. Arrow c indicates the position of the primary forming port, and arrow d indicates the position of the secondary forming port. Reference numeral 24 denotes a vane plate that is ultrasonically bonded to the vane plate 17.

The manufacturing method consists of a primary molding process, a driven magnet 5 insertion process, a secondary molding process, and an adhesion process. In the primary molding process, as shown in Figures 2 and 3, the pump shaft 6 with one bearing 8a attached is inserted and fixed into a mold (not shown), and the resin is poured from the primary molding port (arrow c). The primary molded product 14 is formed around the pump shaft 6 and the bearing 8a.

The pump shaft 6, which has thus formed the primary molded product 14, is taken out from the mold, and in an insertion step, the driven magnet 5 is inserted and positioned using the inner surface of the magnet guide 16 as a guide.

Next, in the secondary forming process, as shown in Figure 4,
The pump shaft 6 equipped with the above-mentioned primary molded product 14 and the driven magnet 5 is inserted and fixed together with the other bearing 8b into another mold (not shown), and resin is filled from the secondary molding port (arrow d). A layer 23 is formed to surround and fix the driven magnet 5. The resin layer 23 fills all the gaps in the resin inflow space 19 formed between the guide ribs 20 and the magnet insertion space 18 including the grooves 22, closes the openings, and closes the bearing 8.
b and the driven magnet 5 are fixed.

In the next bonding step, as shown in FIG. 5, another blade plate 24 is welded to the blade plate 17 by ultrasonic bonding, and the pump blade 4 is completed.

In the pump blade 4 manufactured as described above, since the pump shaft 6 and the primary molded product 14 are joined at the base 15, there is no idle rotation, but if the anti-rotation groove 13 is provided, the effect will be even greater. Become. The resin layer 23 and the primary molded product 14 are engaged with each other through guide ribs 20 and positioning ribs 21 . For this reason, even though the driven magnet 5 is cylindrical, it does not rotate idly, but by providing the driven magnet 5 with an engaging portion with the resin layer 23 consisting of the groove 22, the effect is further enhanced. The rotation can be prevented even if the bearings 8a and 8b are cylindrical, but if they are formed into an irregular shape such as a semi-cylindrical shape, the rotation prevention effect becomes greater.

Since the magnet guide 16 is formed by primary molding, no excessive force is applied during insertion of the driven magnet 5 and secondary molding, and no cracks or the like occur. Further, by forming uneven steps at the tip of the magnet guide 16, it is possible to prevent water from entering and improve compatibility with the resin layer 23.

Incidentally, the engagement portion with the resin layer 23 provided on the driven magnet 5 is not limited to the U-shaped groove shown in FIG. 6, but may be an uneven portion provided in other shapes and positions. For example, as shown in Figure 7, a V provided on the outer periphery
It may be a letter-shaped groove 25 or a rectangular groove 26 provided on the inner circumference as shown in FIG. 8, but the one shown in FIG. 6 is easier to process.

Further, the present invention is applicable not only to the production of pump vanes for pumps for other purposes, but also for hot water conveyance pumps.

As described above, according to the present invention, after the pump shaft is formed with a specific primary molded product, a driven magnet is inserted and the resin layer is filled by secondary molding, so that the following effects can be achieved. is obtained.

Since there is no need to use adhesive to manufacture pump blades, productivity and quality are improved, and pump blades can be manufactured at low cost.

Because the filled resin layer engages between the ribs provided on the vane and with the engaging portion of the magnet,
There is no idle rotation of the magnet due to thermal expansion.

Since the magnet is inserted after the magnet guide is formed by primary molding, there is no cracking on the outer periphery of the magnet.

Serviceability is improved because the parts are integrated.

Thermal stability can be measured even in the case of long-term heat shock or continuous high-temperature use, so long-term use is possible.

Since the molding is performed in stages, there is no molding of thick parts, so sink marks, cavities, etc. do not occur, and unbalance during rotation can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional magnet-driven pump, Fig. 2 is a side view of the primary molded product, Figs. The figures show a driven magnet, in which a is a plan view, b is a sectional view taken along the line B-B, c is a side view, and FIGS. 7 and 8 are plan views showing other examples of driven magnets. In each figure, the same reference numerals indicate the same or equivalent parts, 1 and 2 are the box case, 4 is the blade, 5 is the driven magnet, 6 is the pump shaft, and 7, 8a, 8b.
is a bearing, 9 is a drive magnet, 12 is an electric motor, 1
4 is a primary molded product, 15 is a base, 16 is a magnet guide, 17 and 24 are wing plates, 18 is a magnet insertion space, 20 is a guide rib, 21 is a positioning rib, 22 is a groove, and 23 is a resin layer. .

Claims (1)

[Claims] 1. One bearing and the pump shaft are inserted and fixed in a mold, and resin is filled from the primary molding port to cover the outer periphery of the pump shaft, and a cylindrical magnetic guide concentric with the base. , a primary molding step of forming a primary molded product having a disk-shaped wing plate connecting one end of each of these, and a guide rib extending from the base into the magnet insertion space formed by these; An insertion step of inserting the driven magnet into the magnet insertion space using the inner surface of the magnet guide as a guide, and inserting and fixing the pump shaft with the primary molded product and the driven magnet installed into another mold together with the other bearing, and 2. The method includes a secondary molding step of filling the magnet insertion space with resin from a secondary molding port to form a resin layer surrounding the driven magnet, and an adhesion step of ultrasonically bonding another blade plate to the blade plate. A method for manufacturing a pump vane for a magnet-driven pump, characterized in that: 2. The method of manufacturing a pump vane for a magnet-driven pump according to claim 1, wherein a positioning rib extending from the vane plate to the magnet insertion space is formed in the primary forming step. 3. A method of manufacturing a pump blade for a magnet-driven pump according to claim 1 or 2, characterized in that an engagement portion with the resin layer is formed on the driven magnet. 4. The method of manufacturing a pump vane for a magnet-driven pump according to claim 3, wherein the engaging portion with the resin layer is a groove. 5. A method of manufacturing a pump blade for a magnet-driven pump according to any one of claims 1 to 4, characterized in that a rotation prevention groove is formed on the outer periphery of the pump shaft.