JPS61157249A - Melted material leakage preventing jig for casting rotor - Google Patents

Abstract

PURPOSE:To obtain a melted material leakage preventing jig for a casting rotor applied to a rotor of different diameter by connecting many blocking members by a binding string in series, and individually closing half-closed slots by the members. CONSTITUTION:Half-closed slots 3 having holes 2 are formed on the inner periphery on the outer periphery of a core block 1, gathered to form a rotor. Blocking member 4 is formed of ceramic fiber in a felt shape, a binding string 7 is passed through the holes 6 to be connected in series. A coupler 8 is formed of a hook piece 9, a lock member 10 and a ring member. Thus, the projections 5 of the members 4 are engaged with the holes 2 of the slots 3 by aluminum casting, bound by the string 7 to completely block the holes 2. This core block 1 is set between upper and lower dies, melted aluminum is poured from the inlet of the lower die to cast, thereby forming a cast rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cast aluminum rotor used to close half-open slots in order to prevent aluminum from leaking through the half-open slots when producing the cast aluminum rotor. Regarding a hot water leak prevention jig.

[Technical background of the invention]

Generally, cast aluminum rotors in rotating electric machines have fully closed slots that completely cover the bars, which are the secondary conductors. A semi-closed thrower 1- exposed on the surface is employed.

On the other hand, in a low-pressure casting rotor in which aluminum is cast at low pressure into the rotor shaft, in the case of fully open slots, the casting can be performed without providing a frame to make the circumferential wall of the slot withstand the casting pressure.

However, with half-open slots, it is necessary to take measures to prevent water leakage.

[Problems with background technology]

Conventionally, as a measure to prevent hot water from leaking, the slot was fully open.
There was a method of casting in this state and then cutting the outer periphery of the rotor to expose the bars and obtain the characteristics of a half-open slot. However, this method has the problem that as a result of the cutting process, the fFI layer steel sheets become interconnected, resulting in a large eddy current loss.

Another method is to fit a cylindrical closing jig to the outer periphery of a rotor in which half-open slots are formed, close the half-open slots, and cast in this state.

According to this method, it is necessary to prepare a closing jig for each rotor diameter, which is extremely uneconomical considering that low-speed rotary electric machines are produced in small quantities.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks,
The purpose of this is to eliminate the need for cutting to make semi-closed slots, and also to allow the same jig to be used for casting rotors with different diameters. An object of the present invention is to provide a jig for preventing 184 rotors.

[Summary of the invention]

, l The jig according to the present invention includes rod-shaped closing members of the same number as the number of slots that fit into and close the openings on the circumferential surface of half-open slots, and a binding string that connects these closing members in a series that can be arranged in a circular manner. and a connector that tightens the binding string and presses the closing member in a direction to fit into the opening of the half-open slot, and the closing member prevents leakage from the opening of the half-open slot, Furthermore, since the distance between the closing members can be adjusted, they can also be used for rotors with different diameters or different slot pitches.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

In Fig. 2 to Fig. 5, 1 is an iron core block, and a semi-closed slot 3 is formed on the outer circumferential surface of the iron core block 1, and a semi-closed slot 3 is formed on the circumferential surface of the iron core block 1. one rotor is constructed. 4 is a closing member;
This is made of reramic fiber and is formed into an elastic felt shape. This closing member 4, which will be described in more detail, has a rod shape with a length approximately equal to the length in the axial direction of the iron core block 1, and has a width dimension approximately equal to the width of the opening 2 of the semi-closed slot 3 on the side surface thereof. It is formed in a substantially convex cross section in the direction perpendicular to the axis in which the protruding portion 5 is formed, and holes 6 are formed in the vicinity of both ends thereof, penetrating in the width direction. The number of such closing members 4 equal to the number of half-open slots 3 of the iron core block 1 is prepared, and the binding strings 7 are passed through each hole 6 and connected in a series that can be arranged in a circular manner. The binding cord 7 has a belt shape, but the material may be either flexible or elastic and hard, such as a steel plate.

Reference numeral 8) is a leash tie, which, as shown in FIG. and a ring member 11 received by member 10.

Next, an aluminum casting method using the jig 12 configured as described above will be explained.

1. First, the protrusions 5 of the closing member 4 are fitted into the openings 2 of each half-open slot 3 of the core block 1 as shown in FIGS. 1 and 5, and the binding string 7 is fitted as shown in FIG. To hook the ring member 11 to the hook piece 9 provided in the figure, the lock member 10 is rotated in the direction of arrow A and locked. By this operation, the restraints 1117 surrounding the iron core block 1 are tightened to have a small diameter, and each closing member 4 is tightened to each half-open slot 3.
The opening 2 is strongly pressed against the outer periphery near the opening 2 of the
be completely closed.

A large number of iron core blocks 1 with closure members 4 attached in this way
4th. ．． 6.8 As shown in Figure 8, cold N1 is placed in the mantle 12.
They are stacked while being alternately inserted with disk-shaped spacers 13 forming ducts, and set between a lower mold 14 and an upper mold 15. The spacer 13 used here has a hole 13a communicating with each half-open slot 3 of the core block 1, and is a molded body of alumina-IJ-land whose binder is water glass or the like which disintegrates in water. .

After setting as described above, a casting operation is performed in which aluminum water is injected from the sprue 16 of the lower mold 14.

After molding, the mold is released, and the spacers 13 are disintegrated with water and removed.

Further, the locking member 4 and the locking member 10 are rotated in the direction opposite to the arrow A to disengage the ring member 11 from the hooking piece 9, thereby disengaging the two ends of the binding string 7 from each other. As a result, the iron core block [1] can be removed from the iron core block [1], and the cast-in rotor is completed. To apply this jig 12 to rotors with different diameters, adjustment holes 1 are formed in advance in multiple stages in the binding string 7.
The hooking piece 9 can be attached to the slot 7 by appropriately selecting the position and adjusting the length, and also by adjusting the slot pitch h! Since the closing member 4 is movable along the binding string 7, it can be freely applied to the rotor.
Further? 1' Closed member 4 for skew of closed slot
Because it has elasticity, it can respond freely. Also, thrower 1
- If the number of closure members 4 is around the same, it is possible to increase or decrease the number of closing members 4 provided on the binding string 7. It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and in particular, the coupling device is not limited to the above-mentioned structure, and the rotor platform that does not require a cooling duct can be constructed using the closing member 4. The length of J may be set to cover the entire length of the slot.

〔Effect of the invention〕

In the present invention, as described above, a large number of closing members are connected in series with a binding string, and each closing member individually closes a half-open slot, so that the same jig can be used for rotors with different diameters. It is possible to provide a heat and moisture prevention jig for a casting rotor which can also be applied.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention,
Fig. 1 is a plan view of the jig, Fig. 2 is a perspective view of a semi-closed slot and the closing member shown therein, Fig. 3 is an enlarged perspective view of a notch in the closing member, and Fig. 4 is a portion showing the state before the mold ceramic mill. Fig. 5 is an enlarged sectional view taken along the v-v line in Fig. 4;
FIG. 7 is a perspective view showing the spacer, FIG. 7 is a perspective view showing the connector, and FIG. 8 is a longitudinal sectional view showing the cast state. In the figure, 1 is a core block, 2 is an opening, 3 is a half-open slot, 4 is a closing member, 5 is a protrusion, 7 is a binding string, 8 is a connector, 13 is a space 41, 1/I is a lower mold , 15 are -1- type. Agent Patent Attorney Nori Chika *To Yu (one idiot) Figure 1 Figure 2 Figure 3 Figure 4 One Figure 5 Figure 6 Figure 1 Nua Figure 7 □-Δ JP-A-1-157249 ( 4) Figure 8, -<"'I T"

Claims (1)

[Claims] 1. A rod-shaped closing member made of an elastic material that fits into the circumferential opening of the semi-closed slot in the rotor so as to close it, and a binding string that connects a large number of the closing members in a series that can be arranged in a circular manner. A leakage prevention jig for a casting rotor, comprising a connecting tool provided on a binding string and tightened in a direction in which each closing member fits into a circumferential opening of a semi-closed slot.