JPH01310514A - Rotor of mixer - Google Patents

Abstract

PURPOSE:To make a rotor of a mixer at low cost by covering a cast magnet consisting of a rare earth element, a transition metal, boron and copper with resin. CONSTITUTION:A magnet 101 is magnetized in the longitudinal direction and is covered with a cover 102 made of resin such as Teflon. In other words, a rotor of this mixer is made by covering the cast magnet (R-TM-B-Cu cast magnet) 101 consisting of a rare earth element (including yttrium (Y)), a transition metal, boron (B) and copper (Cu) with the resin 102. Therefore, the rotor has a strong attracting force with a fixed driving side of the mixer and even a fluid of a high viscosity can be mixed well. What's more, no restriction is put on the shape of the rotor as in the case of using an Alnico magnet, thereby the rotor can be manufactured at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor for a stirring device used for mixing and stirring chemicals and the like.

[Prior Art] Generally, the rotor of a stirring device has a structure in which a permanent magnet 202 is contained in a resin cover 201, as shown in FIG. The rotor of a conventional stirring device uses a ferrite magnet or an alnico magnet as a permanent magnet. Teflon resin was often used for the cover due to its chemical resistance.

[Problems to be Solved by the Invention] However, the rotor of a conventional stirring device using ferrite magnets has the following drawbacks: (1) The attraction force with the stationary side is not sufficient, and it is difficult to handle liquids with particularly high viscosity. In many cases, sufficient stirring was not performed.

(2) Sintered ferrite magnets are easily broken, requiring careful handling during rotor manufacture.

Furthermore, rotors of conventional stirring devices using alnico magnets have the following drawbacks: (1) Alnico magnets have a small coercive force and are easily demagnetized, so care must be taken when handling them.

(2) In order to make the permeance coefficient of the magnet sufficiently large,
Since the magnet cannot be used unless it is elongated, it is difficult to make a small one, which is inconvenient when used to stir a small amount of liquid. For example, when a magnet is made into a cylinder, the ratio of length to diameter needs to be about 4 or more.

For the reasons mentioned above, it has recently been considered to use rare earth magnets that have a large maximum energy product and a large coercive force, but the manufacturing process is complicated and the price of the magnets is high.
It was difficult to put it into practical use in applications such as the rotor of a stirring device due to cost issues.

Therefore, the present invention aims to solve these problems.
The purpose is to use R-TM on the rotor of the stirring device.
By using -B-CJQ magnets, problems associated with using ferrite magnets or alnico magnets can be avoided, and a low-cost rotor for a stirring device can be provided.

[Means for Solving the Problems] The rotor of the stirring device of the present invention is a cast member whose basic composition is a rare earth element (including yttrium (Y)), a transition metal, boron (B), and copper (C1). Magnet (R-TM
-B -CuR magnet) is enclosed in resin.

[Example] Table 1 shows R used in the rotor of the stirring device according to the present invention.
-TM-B-The alloy composition of the Cu cast magnet is shown.

Table 1 Weighed rare earth metals (P, ), transition metals (F8), boron (B) and copper (CU) in the two types of compositions shown in Table 1,
Table 2 shows the magnetic properties of magnets obtained by melting in an induction heating furnace and then casting. Ferrite magnets generally have (BH)
The upper limit is about 55.

Further, for alnico magnets, the upper limit is approximately iHo = 2.

The rotor of the stirring device obtained by inserting the R-TM-B-Cu cast magnet into the resin described above can sufficiently stir even highly viscous liquids, is difficult to demagnetize, and has an elongated magnet shape. Since there are no restrictions on shape, it is possible to manufacture small items.

Table 2 and FIG. 1 show a sectional view of the rotor of the stirring device of the present invention. As shown in the figure, the magnet 101 is magnetized in the longitudinal direction and is enclosed in a cover 102 made of resin such as Teflon.

It should be noted that the magnet composition shown as an example is a composition that was able to obtain good results through experimental confirmation. A typical example is shown in which praseodymium (Pl) is used as the rare earth metal and iron (Fo) is used as the transition metal. Although specific composition examples are omitted, it has been confirmed that the coercive force of the magnet increases by replacing a portion of Pr with dysprosium (DV). In addition, rare earth metals such as cerium (C,) and neodymium (Nd), which are cheaper than Pr, are also available.
) could also be used to partially replace Pr.

Regarding transition metals, part of F6 is replaced by cobalt (C.

), the temperature characteristics of the magnet were significantly improved, and it was confirmed that it could withstand use at considerably high temperatures. Furthermore, by substituting a part of Fo with nickel (N1), the coercive force of the magnet was increased.

[Effects of the Invention] As described above, the rotor of the stirring device of the present invention has many advantages over conventional ones, and is extremely superior mainly in the following points.

(1) The suction force between the fixed drive side of the m-pushing device is large, and even liquids with high viscosity can be sufficiently stirred.

(2) The rotor shape is not limited as in the case of using alnico magnets.

(3) Low cost because cast magnets are used.

[Brief explanation of the drawing]

FIG. 1 is a sectional view 101 of the rotor of the stirring device of the present invention.
Magnet 102...Cover Figure 2 is a cross-sectional view of the rotor of a conventional stirring device 201...Cover 202...Magnet Applicant Seiko Epson Corporation Agent Patent Attorney Kizobe Suzuki (t!l 1 person 1st)
figure

Claims (1)

[Claims] A cast magnet (hereinafter referred to as R-TM-B-Cu cast magnet) whose basic composition consists of rare earth elements (including yttrium (Y)), transition metals, boron (B), and copper (Cu) is enclosed in resin. A rotor of a stirring device characterized by: