JP3459621B2 - Method for manufacturing rotor of compressor motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor for a compressor, which is formed by integrally molding a rotor core having an oil separating disc and a caulking boss for crimping a balance weight projecting from both ends by aluminum die casting. The present invention relates to a manufacturing method of the rotor.

[0002]

2. Description of the Related Art Generally, a conventional method for manufacturing a rotor for a compressor electric motor includes a rotor core in which thin steel plates such as silicon steel plates are laminated in an axial direction, and end rings located at both ends of the rotor core. A plurality of secondary conductors passing through the rotor core and connecting one end ring and the other end ring are integrally formed by aluminum die casting. 9 and 10 show a rotor of a compressor electric motor. In each drawing, 105 is a rotor, 130 is a first end ring, and 1 is a rotor.
28 is a rotor core. The rotor core 128 is formed by laminating a plurality of 0.5 mm thick electromagnetic steel plates (iron plates for rotors) punched into a predetermined shape. The rotor iron plates are crimped together and integrally laminated (or integrally formed by welding). Although not shown, a second end ring is arranged on the other end side of the rotor 105.

A first end ring 130 located at one end of the rotor core 128 is disposed on both sides of the center of the first end ring 130, and an oil separating disk (not shown) is caulked and fixed. A pair of first caulking bosses 131 and 132 for doing so are provided so as to project from the rotor core 128 on the side of separation. Also, a pair for crimping balance weights (not shown) are provided at positions moved by 20 to 25 degrees from one side connecting the centers of the first caulking bosses 131 and 132 to the centers of the first caulking bosses 131 and 132, respectively. The second caulking bosses 134 and 135 are also the rotor core 1
28 is provided so as to protrude from the separated side.

When the rotor 105 is die cast by an aluminum die casting mold (not shown), the aluminum pouring gate 144 of the die casting mold of the rotor 105 is generally a first caulking boss 132 to a second caulking boss. The first position at the position moved 90 degrees to the 134, 135 side
It was arranged on the side surface of the end ring 130. Further, the degassing port 145 of the molding die of the rotor 105 is the pouring gate 14
4 was disposed on the side surface of the first end ring 130 at a position facing each other with the center of the first end ring 130 interposed therebetween.

[0005]

However, when the rotor is die-cast by the aluminum die-casting die thus constructed, the aluminum introduced from the pouring gate moves 90 degrees from the first caulking boss to the second caulking boss side. Since it was arranged on the side surface of the first end ring at the above position, negative pressure was generated at the roots of the first caulking boss and the second caulking boss that were provided so as to project from the first end ring. This negative pressure causes the first caulking boss and the second
Many nests were formed near the root of the caulking boss, and the strength of the first caulking boss and the second caulking boss had been reduced. Therefore, there is a problem that the second caulking boss is damaged due to the stress when caulking the balance weight.

The present invention has been made in order to solve the problems of the prior art, and provides a method for manufacturing a rotor of a compressor electric motor in which the position of the aluminum injection gate is changed to prevent the caulking boss from being damaged. The purpose is to provide.

[0007]

That is, a method for manufacturing a rotor of a compressor electric motor according to the first aspect of the present invention comprises a rotor core,
First and second end rings located at both ends of the rotor core, and a pair of first caulking bosses projecting on both sides of the center of the first end ring for caulking an oil separating disk. , A pair of second caulking bosses, which are respectively projecting from the first caulking bosses in positions moved by 20 to 25 degrees in the same direction, for caulking the balance weights, and both end rings passing around the rotor iron core. A plurality of secondary conductors to be connected, the first end ring including each caulking boss, the secondary conductor and the second end ring are integrally configured by die casting of aluminum, and an aluminum pouring gate is provided. It is arranged on the side surface of the first end ring at a position moved 110 degrees to 170 degrees from the first caulking boss side to the second caulking boss side, and the gas vent is connected to the pouring gate and the first pouring gate. Across the center of the end ring are those disposed on the side face of the first end ring of the opposing positions.

The rotor of the compressor motor according to a second aspect of the present invention is characterized in that in the above, the aluminum pouring gate is
120 ° to 1 from the first caulking boss to the second caulking boss
It is arranged on the side surface of the first end ring at a position moved by 60 degrees.

The rotor of the compressor motor according to a third aspect of the present invention is the rotor according to the first aspect, wherein the aluminum pouring gate is located at a position that is moved from the first caulking boss to the second caulking boss side by 130 to 140 degrees. 1 End ring is arranged on the side surface.

According to the first aspect of the present invention, the aluminum pouring spout is provided from the first caulking boss to the second caulking boss side.
It is arranged on the side surface of the first end ring which is moved by 10 to 170 degrees, and the gas vent is arranged on the side surface of the first end ring which is opposed to the pouring gate and the center of the first end ring. Therefore, for example, an injection die gate of aluminum die casting is provided as in claim 2 or 3.
120 ° to 1 from the first caulking boss to the second caulking boss
By arranging it on the side surface of the first end ring which is moved by 60 degrees, or by arranging the pouring gate of aluminum on the side surface of the first end ring which is moved by 130 to 140 degrees from the first caulking boss to the second caulking boss side. It is possible to change the flow of the aluminum die casting that flows into the first caulking boss and the second caulking boss. This allows
Since the pressure generated in the first caulking boss and the second caulking boss changes when the aluminum die casting flows in, the aluminum die casting can easily flow into the first caulking boss and the second caulking boss. Therefore, the number of nests formed at the root of the first caulking boss and the second caulking boss can be significantly reduced as in the conventional case, and thus the strength of the first caulking boss and the second caulking boss can be significantly improved. It will be.

In particular, since the incidence of nests in the vicinity of the root of the first caulking boss can be greatly reduced, it is possible to prevent inconveniences such as the first caulking boss sinking into the first end ring when caulking the balance weight. Is possible. Therefore, it is possible to reliably prevent the inconvenience that the root of the first caulking boss is damaged by the nest when crimping the balance weight.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of the compressor. In this figure, reference numeral 1 is a closed container, in which an electric motor 2 is housed on the upper side and a compression element 3 which is rotationally driven by the electric motor 2 is housed on the lower side. The hermetically sealed container 1 is a container that is previously divided into two parts, and the electric motor 2 and the compression element 3 are housed therein, and then hermetically sealed by high frequency welding or the like.

The electric motor 2 is composed of a stator 4 fixed to the inner wall of the hermetic container 1 and a rotor 5 supported inside the stator 4 so as to be rotatable around a rotation shaft 6. . The stator 4 includes a stator winding 7 that applies a rotating magnetic field to the rotor 5.

The compression element 3 comprises a first rotary cylinder 9 and a second rotary cylinder 10 which are partitioned by an intermediate partition plate 8. Eccentric parts 11 and 12 which are rotationally driven by the rotary shaft 6 are attached to the respective cylinders 9 and 10, and the eccentric parts 11 and 12 are 180 degrees out of phase with each other.

Reference numerals 13 and 14 denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate inside the cylinders by rotation of the eccentric portions 11 and 12, respectively.

Reference numerals 15 and 16 denote a first frame body and a second frame body, respectively. The cylinder 9 is sandwiched between the first frame body 15 and the partition plate 8 to form a compression space, and the second frame body 16 is formed. Similarly, the cylinder 10 is sandwiched between the partition plate 8 and the partition plate 8 to form a compression space. The first frame body 15 and the second frame body 16 are provided with bearing portions 17 and 18 of the rotary shaft 6, respectively.

Reference numerals 19 and 20 denote discharge mufflers, which are attached so as to cover the first frame 15 and the second frame 16, respectively. The cylinder 9 and the discharge muffler 19 are communicated with each other through a discharge hole (not shown) provided in the first frame body 15. The cylinder 10 and the discharge muffler 20 are also connected to the second frame body 16.
They are communicated with each other through discharge holes (not shown) provided in the. Two
1 is a bypass pipe provided outside the closed container 1,
It communicates with the inside of the discharge muffler 20.

Reference numeral 22 is a discharge pipe provided on the closed container 1, and 23 and 24 are suction pipes connected to the cylinders 9 and 10, respectively. Further, reference numeral 25 is a closed terminal for supplying electric power to the stator winding 7 of the stator 4 from the outside of the closed container 1 (the sealed terminal 25 and the stator winding 7).
(The lead wire connecting to and is not shown). Reference numeral 30 is a first end ring located at one end of the rotor core 28, which will be described later, and 38 is a second end ring located at the other end of the rotor core 28.

FIG. 2 is a partial sectional view of the rotor 5 shown in FIG. 1 (state before being press-fitted into the rotary shaft 6). In this figure, 28 is a rotor core, which is a laminate of a plurality of 0.5 mm thick electromagnetic steel plates (iron plates for rotors) punched into a predetermined shape. The electromagnetic steel sheets are crimped to each other and integrally laminated (or integrally formed by welding).

The first end ring 30 is provided at one end of the rotor core 28, and the oil separating disks 26 are provided on both sides of the center of the first end ring 30.
Pair of first caulking bosses 31 and 3 for caulking
2 are projected (Fig. 3). Further, a pair of second caulking bosses 34, 35 for caulking the balance weight 33 with respect to the compression element 3 from the first caulking bosses 31, 32 in the same direction are provided in a protruding manner.

The second end ring 38 is located at the other end of the rotor core 28, and is also provided with caulking bosses 39, 40 for caulking and fixing the balance weight 41 to the compression element 3. These first end ring 30, first caulking bosses 31, 32, second caulking bosses 3
4, 35, the second end ring 38, and the caulking boss 3
The rotor 5 composed of 9, 40 is integrally formed by die casting of aluminum.

The disc 26 for oil separation is fitted into the first caulking bosses 31, 32 and has a shape so as to be caulked and fixed, and is caulked and fixed to the first caulking bosses 31, 32. The balance weight 33 is the second
The second caulking boss 34, the shape and weight of which are fitted to the caulking bosses 34, 35 so that the caulking can be fixed.
It is fixed by crimping to 35. Similarly, the balance weight 41 is fitted into the caulking bosses 39 and 40, and its shape and weight are configured so that the caulking can be fixed.
The balance weight 41 is crimped and fixed to 0.

The second caulking bosses 34 and 35 are provided at positions (arrows in FIG. 3) moved by 20 to 25 degrees from the first caulking bosses 31 and 32, respectively. Further, the caulking bosses 39, 40 are located on the second caulking bosses 34, 35 side, and are provided at positions moved by 21.2 to 24.2 degrees with respect to the first caulking bosses 31, 32 (arrows in FIG. 4). Reference numeral 42 denotes a plurality of secondary conductors formed on the side surface of the rotor core 28, and has a skewed shape that passes through the periphery of the rotor core 28 and connects both end rings 30, 38.

Here, FIG. 5 shows changes in the position (angle) and porosity of the pouring gate 44 (boss-gate in the figure) from the first caulking boss 32 on one side. The number of nests on the vertical axis (0 to 1
4), the angle (40 degrees to 20 degrees) of the pouring gate 44 with respect to the first caulking boss 32 position (boss position in the figure) on one side on the horizontal axis.
0 degree) is shown. From this figure, the angle of the pouring spout 44 from the first caulking boss 32 is 9 at 100 degrees, 8 at 110 degrees, 7.2 at 120 degrees, 6 at 130 degrees, 5 at 140 degrees, and 150 degrees. 6.8, 7 at 160 degrees, 170
It can be seen that there are eight at 9 degrees and nine at 180 degrees. That is, the angle of the pouring spout 44 from the first caulking boss 32 is 1
It is known from the experimental results that the minimum (5) is obtained at 40 degrees.

On the other hand, FIG. 6 shows a sectional view of the die casting mold 43 of the rotor 5. In this figure, 43 is a die casting mold, and 4 is a rotor 5 molded by the die casting mold 43. Further, 44 is a pouring spout for injecting aluminum die casting into the die casting mold 43, and 45 is a degassing port for discharging internal gas when the aluminum die casting is flown into the die casting mold 43 from the inflow spout 44. (FIG. 7).

The pouring gate 44 is moved from the first caulking boss 32 on one side to the second caulking bosses 34 and 35 on the one side by 110 to 170 degrees as shown in FIG. 8, more specifically, from the first caulking boss 32 to the second caulking boss 34. , On the 35 side 120
It is disposed on the side surface of the first end ring 30 at a position moved by 1 to 160 degrees, more specifically at a position moved by 130 to 140 degrees from the first caulking boss 32 to the second caulking bosses 34, 35. Also, the gas vent 45 is the pouring gate 44.
Is disposed on the side surface of the first end ring 30 at a position opposed to the center of the first end ring 30. Although the pouring gate 44 is located at a position moved by a predetermined angle from the first caulking boss 32 on one side, it may be provided at a position moved by the same angle from the first caulking boss 31 on the other side. In this case as well, the gas vent 45 is connected to the inlet 44 and the first
It is arranged on the side surface of the first end ring 30 at a position facing each other with the center of the end ring 30 in between.

When aluminum die casting is poured from the pouring gate 44, a skewed secondary conductor 42 is formed which passes around the rotor core 28 and connects both end rings 30 and 38. At the same time, the die casting of aluminum flows into the second end ring 38, the caulking bosses 39, 40, etc., and further, the first end ring 30,
First caulking bosses 31, 32, second caulking bosses 34, 35
And the rotor 5 is die cast. In this case, the pouring spout 44 is provided from the first caulking boss 32 on one side to the second caulking boss 32 on one side.
Since the caulking bosses 34, 35 are provided at positions moved by 130 to 140 degrees, the first caulking bosses 32, the second caulking bosses 34, 35 near the roots of the nest are formed by the die casting of aluminum with the flow changed. The situation is low. In the die casting mold 43, the air that has escaped due to the inflowing aluminum die casting is discharged from the gas vent 45, and the rotor 5 is aluminum die casting.

As described above, the pouring spout 4 is provided on the side surface of the first end ring 30 at a position moved from the first caulking boss 32 on one side to the second caulking bosses 34, 35 by 130 to 140 degrees.
4 is arranged, it is possible to change the flow of the aluminum die casting that flows into the first caulking bosses 31, 32 and the second caulking bosses 34, 35. This allows
First caulking boss 3 at the time of aluminum die casting
By changing the pressure inside the first and second caulking bosses 34 and 35 by changing the pressure inside the first and second caulking bosses 34 and 35, the pressure inside the first and second caulking bosses 34 and 35 can be changed significantly. The strength of the first caulking bosses 31, 32 and the second caulking bosses 34, 35 can be significantly improved while being reduced.

Further, since the number of nests generated near the roots of the first caulking bosses 31, 32, the second caulking bosses 34, 35 and the caulking bosses 39, 40 can be greatly reduced, the first end ring 30 and the second caulking bosses 30 Since the weight of the end ring 38 is also stable, the weight adjustment of the balance weights 33, 41 is small, and the balancer effect with good accuracy can be obtained.

[0030]

As described above in detail, according to the present invention, the aluminum pouring spout is arranged on the side surface of the first end ring at a position moved 110 to 170 degrees from the first caulking boss to the second caulking boss side, and The first opening is located at a position facing the pouring spout with the center of the first end ring in between.
Since it is arranged on the side surface of the end ring, for example, an aluminum die casting pouring gate is provided from the first caulking boss to the second caulking boss side as described in claim 2 or 3.
Arranged on the side of the first end ring at a position moved by 0 to 160 degrees, or arranged an aluminum injection gate on the side of the first end ring at a position moved by 130 to 140 degrees from the first caulking boss to the second caulking boss side. By doing so, it is possible to change the flow of the aluminum die casting that flows into the first caulking boss and the second caulking boss.
As a result, when aluminum die casting is introduced, the first
Since the pressure generated in the caulking boss and the second caulking boss changes, it becomes possible to facilitate the inflow of the aluminum die cast into the first caulking boss and the second caulking boss. Therefore, the first caulking boss and the second
Since the number of nests generated at the root of the caulking boss can be significantly reduced, the strength of the first caulking boss and the second caulking boss can be significantly improved.

In particular, since the incidence of nests near the root of the first caulking boss can be greatly reduced, it is possible to prevent inconveniences such as the first caulking boss sinking into the first end ring when caulking the balance weight. Is possible. Therefore, it is possible to reliably prevent the inconvenience that the root of the first caulking boss is damaged by the nest when crimping the balance weight.

[Brief description of drawings]

FIG. 1 is a sectional view of a compressor.

FIG. 2 is a partial cross-sectional view of a rotor.

FIG. 3 is a plan view of a rotor on a first end ring side.

FIG. 4 is a plan view of a rotor on a side of a second end ring.

FIG. 5: Position (angle) of the pouring spout from the first caulking boss
It is a figure which shows the change of a nest.

FIG. 6 is a cross-sectional view of a die casting mold showing a positional relationship between a pouring gate and a gas vent with respect to a rotor.

FIG. 7 is a plan view of a die casting mold showing a positional relationship between a pouring gate and a gas vent with respect to a rotor.

8 is a plan view of the rotor for explaining the positions of the pouring gate and the gas vent of FIG. 7. FIG.

FIG. 9 is a plan view of a rotor showing a positional relationship between a pouring gate and a gas vent of a conventional die casting mold.

FIG. 10 is a front view of the rotor showing the positional relationship between the pouring gate and the gas vent of the die casting mold of FIG.

[Explanation of symbols]

1 closed container 2 electric motor 3 compression elements 4 stator 5 rotor 6 rotation axes 9 First rotary cylinder 10 Second rotary cylinder 26 discs 28 rotor core 30 First end ring 31 First Caulking Boss 32 1st caulking boss 33 Balance weight 34 Second Caulking Boss 35 Second Caulking Boss 38 Second end ring 42 Secondary conductor 43 Die casting mold 44 pouring sprue 45 Degassing port

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Claims (3)

(57) [Claims] 1. A rotor core, first and second end rings located at both ends of the rotor core, and projections provided on both sides of the center of the first end ring for separating oil. A pair of first caulking bosses for caulking fixation, and 20 degrees to 25 degrees in the same direction from the first caulking bosses.
A pair of second crimping bosses for projecting the balance weights for crimping the balance weights, and a plurality of secondary conductors passing around the rotor core and connecting the both end rings, A method of manufacturing a rotor of a motor for a compressor, wherein the first end ring including each caulking boss, the secondary conductor, and the second end ring are integrally formed by die casting of aluminum. Is disposed on the side surface of the first end ring at a position moved 110 degrees to 170 degrees from the first caulking boss to the second caulking boss side, and the gas vent is opposed to the pouring gate and the center of the first end ring. A method for manufacturing a rotor of a compressor electric motor, characterized in that the rotor is disposed on a side surface of the first end ring at a position. 2. The compressor according to claim 1, wherein an aluminum pouring spout is arranged on the side surface of the first end ring at a position moved 120 degrees to 160 degrees from the first caulking boss to the second caulking boss side. Electric motor rotor. 3. The compressor according to claim 1, wherein the aluminum pouring spout is arranged on the side surface of the first end ring at a position moved from the first caulking boss to the second caulking boss side by 130 to 140 degrees. Electric motor rotor.