JPS58124091A - Resin molding method of driving magnet used in magnet pump - Google Patents

Abstract

PURPOSE:To provide an impeller, capable of bearing the torque acted thereto, by forming an impeller part integrally with a synthetic resin part formed at one end of a driven magnet, and thereby increasing the coupled force acted between two parts made of a synthetic resin. CONSTITUTION:A boss P2a is formed by injecting a synthetic resin to the inner peripheral part and the right-side end part of a driven magnet 6 where the synthetic resin injected from a synthetic resin injection port D3 is not applied at the first process of injection molding. An impeller P2 is formed by coupling the boss P2a and a blade P2b with a cover P1 that has been formed at the first process. Therefore, the coupling force acted between the two parts made of a synthetic resin is increased, so that a sufficient strength is imparted to the impeller to bear the torque acted thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a resin molding method for a driven magnet in a magnetic pump.

First, the overall structure of the magnet pump will be explained with reference to FIG. In the figure, 1 is a model, IA is a model axis, 2 is a resin pump casing attached to the load side 7 langes of the model 1, and includes a front casing 2A, a pack casing 2B having an inner cylindrical part 2Ba and an outer cylindrical part 2gb. It consists of: 8 is the inner cylindrical part 2Ba
4 is a bottomed cylindrical magnet holder disposed between the outer cylindrical portion 2Bb and the outer cylindrical portion 2Bb, and is detachably connected to the load side end of the model shaft IA without a key (not shown). It is a cylindrical drive magnet fitted to the inner peripheral surface, and is loosely fitted concentrically to the outer periphery of the inner cylindrical portion 2B& with a micro field □ in between. Reference numeral 5 denotes a synthetic resin impeller arranged inside the pump casing 2, and a circle 1. The A-shaped driven magnet 6 is molded to be concentric with the drive magnet 4. Reference numeral 7 designates an impeller shaft having one end supported by the front casing 2A and the other end supported by the back casing 2B, for rotatably supporting the single blade part 5.

Next, the present invention, that is, the resin molding method of the driven magnet will be explained in detail with reference to FIG.

This resin molding method consists of a first step and a second step. First, the first step will be explained with reference to FIG. The protruding rod part A2 protrudes from the side, and the base +'4A1 is connected to the protruding rod part A2.
A pair of knockout bottle holes passing through in parallel with 8. A8
and a knockout bottle hole A8. A8t is designed to fit the well-known knockout bin 8.8. 6 is a cylindrical driven magnet, the inner diameter part of which fits into the protruding rod part A2 during injection molding of synthetic resin, and its right end. When the protrusion 6a formed near the center comes into contact with the negative side of the substrate A1 and is positioned in the axial direction,
V is formed so that a gap G1 is formed between the driven magnet 6 on a part of the outer periphery of the protrusion 6a and the substrate A1 in the positioned state. B is an injection molding mold paired with injection molding mold A, and the outer circumference of the driven magnet 6 is inserted into the hole B1! - and the opening end is the above - of the substrate A1.
A gap G2 is formed between the outer periphery of the driven magnet 6 and a gap G8 is formed between the left end of the driven magnet 6 and the left end of the driven magnet 6 in a state where the two sides are in contact with each other. B
2. B2 is a synthetic resin injection port disposed at a position facing the left end of the driven magnet 6 of the injection mold B, from which a cover portion P1 covering the outer periphery of the driven magnet 6 and both ends in the axial direction is formed. The synthetic resin is injected in such a way that it looks like this.

Next, to explain the second step with reference to FIG. 12, C is an injection molding mold, which has a hole C1 into which the outer peripheral part of the cover part P1 molded in the first step is fitted and supported, and A pair of knockout bottle holes c2 facing the left end of P1. c2, and a well-known knockout bottle 9.9 is fitted into the knockout bottle holes 02, 02. D is an injection molding mold paired with the injection molding mold C, and includes a substrate D1 that comes into contact with the right end of the injection molding mold C and stitches the opening of the hole C1, and a driven magnet 6 from one side of the substrate D1. A protruding rod portion D2 is manufactured and inserted in and out to form a predetermined gap G4 at the inner peripheral portion of the substrate D1, and a synthetic resin injection port D8 passes through the substrate D1 in parallel with the protruding rod portion D2. ls is made,
By the synthetic resin injected from the synthetic resin injection port DB, the synthetic resin flows into the inner peripheral part and the right end of the driven magnet 6 which is not covered with sealant and is formed in the first step. The boss portion P2a and the blade portion P2b are integrally formed with the cover portion P1 formed in the @l step to form an impeller P2.In addition, in the first step, when the injection gi shape is completed, the injection Separate molds A and B from each other,
The driven magnet 6 covered by the cover part P1 is removed from the injection mold A by the knockout bin 8.8, and after the synthetic resin injection I and V shapes in the second step, the injection mold 0.8 is removed from the injection mold A. As is well known, the driven magnet 6 molded on the boss portion P2a of the impeller P2 is removed from the injection molding mold C using the knockout bin 9.9 by rotating D by a distance t from each other. It is.

As described above, this invention is a resin molding method for a driven magnet in a magnet pump molding machine, and is a cylinder that is placed in a space formed by injection molding molds A and B facing each other in the WJ1 process, and is located near the center of one end in the axial direction. A driven magnet having a protrusion is fitted onto a protruding rod portion of the injection mold so that the tip of the protrusion comes into contact with the injection mold A, and the injection mold and the driven magnet are connected to each other. After injection molding a synthetic resin that forms a part of the cover covering the outer side of the driven magnet and the one end in the gap formed between the two, injection molding molds C9D are formed facing each other in a second step. The space is covered with the synthetic resin l1df in the first step of the driven magnet, which is disposed so as to be supported by the inner diameter surface of the injection mold C through the second part of the cover. Since the synthetic resin was injection molded so as to form an impeller with blades disposed on the one end side, the outer periphery of the protrusion, C1'', and the biased portion e of the driven magnet. An impeller part is formed integrally with the synthetic resin part to be formed. Therefore, the bonding force between the synthetic resin part injection-molded in the first step and the synthetic resin part 8d injection-molded in the second step becomes large, so that it can easily withstand the torque acting on the blade. Since there is no need to provide a special protrusion on the injection mold A to form a gap between the right end of the driven magnet and the injection mold A, it is possible to The cleaning of #7 of the injection molding mold A is easy, and production efficiency is improved.

[Brief explanation of drawings]

- Figure 1 is an overall configuration diagram of the magnet pump, Figure 2 is an explanatory diagram of the present invention, Figure 1a is for the first step, and Figure 1 is for the second step. In the figure, 2 is a pump casing, 3 is a magnet holder, 4 is a driving magnet, 6 is a driven magnet, 6a is a protrusion, A is an injection mold, AI is a substrate, and A
2 is a protruding rod, B is an injection mold, B1 is a hole, B2 is an injection port, C is an injection mold, C1 is an injection mold, Dl is a thread plate, and B2 is a protruding rod. part, B3 is the injection port, 01
~G4 is the gap, Pl is part of the cover, B2 is the impeller, P2
a is a boss portion, and P2b is a blade portion. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] ; In the g1 process, the injection molding mold and B are mutually ^t
, I8+] 1. A cylindrical driven magnet having a protrusion near the center of one end in the axial direction, which is arranged in the space formed, is attached to the protruding rod part of the injection molding mold, and the protruding end of the protrusion is attached to the injection molding mold. A synthetic resin is injected to form a part of the cover that covers the outer part of the driven magnet and the one end in the gap formed between the injection molding mold and the driven magnet when they are fitted so that they are in contact with each other. After that, in the second step, the driven magnet is placed in the space formed by the injection molding molds dC and D facing each other so as to be supported by the inner diameter surface of the injection molding mold C through a part of the cover. The synthetic resin is injection-molded so that the portion not covered with the synthetic resin in the first step is covered and an impeller having blades arranged on the one end side is formed. Resin molding method for driven magnets for magnetic pumps.