JP2001268835A - Refrigerant compressor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a refrigerant compressor including a motor unit having high reliability and excellent productivity. A compression mechanism for compressing and discharging a refrigerant;
An electric motor unit 5 including a stator 8 and a rotor 9 for driving the compression mechanism unit is provided.
2, a plurality of teeth 33 are radially installed, and each of these teeth is wound with a winding 31 via an insulating member 40. The insulating member is a resin molded product.
An inner flange portion A, an outer flange portion B, and a body portion C connecting these, and a winding is wound around the body portion, and the body portion includes a winding body portion c in close contact with one end surface of the teeth portion; A pair of teeth insulating portions d which are provided integrally on both side ends of the winding drum portion and are in close contact with both side surfaces of the teeth portion, and are wound around a corner portion 41 which is a connecting portion between the winding drum portion and the teeth insulating portion. R chamfer of 1/2 or more of the wire diameter was provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor constituting a refrigeration cycle of, for example, a refrigerator or an air conditioner, and more particularly to an insulating member for windings of an electric motor.

[0002]

2. Description of the Related Art A compressor used for a refrigerator or an air conditioner, for example, comprises a compression mechanism for compressing a refrigerant, and an electric motor having a stator and a rotor for driving the compression mechanism. .

[0003] In order to pursue energy saving and comfort in the refrigeration cycle operation, the electric motor section has a two-pole or four-pole three-phase winding and is often driven by an inverter power supply. .

[0004] For example, Japanese Patent Application Laid-Open No. 10-288180 discloses a technique for an electric motor section of a refrigerant compressor. Here, as a stator constituting a motor portion, an insulating member (also called a coil bobbin) is fitted into a tooth portion constituting a stator core, and winding is performed on the tooth portion via the insulating member, which is called a so-called concentrated winding. The method is adopted.

On the other hand, Japanese Patent Application No. 11-227539 discloses that
The position and quantity of the resin injection port (gate) when molding the insulating member, the selection and specific material characteristics of the resin molding material, the R at the corner where the inner flange and the winding body intersect.
Techniques such as shapes, combinations of applied refrigerant and refrigerating machine oil, and the like are disclosed.

[0006] That is, the insulating member includes a body portion formed of a rectangular frame fitted into the teeth portion having a rectangular cross section, an inner flange portion integrally provided along an inner peripheral edge and an outer peripheral edge of the body portion, and It consists of an outer collar.

In molding such an insulating member, a mold having a resin injection port has an inner flange portion and an outer flange portion formed on a fixed mold, and a body portion formed on a movable mold. The tooth insulating portion is dug, and the inner and outer collar portions, the winding drum portion forming the body portion, and the tooth insulating portion are integrally formed.

For this reason, a mold for molding an insulating member corresponding to each product shape is used, and the dividing surface (parting surface) between the fixed mold and the movable mold is a winding drum section. And the teeth insulating portion intersect.

[0009]

However, at the corner where the winding body of the body of the insulating member and the teeth insulating portion intersect, the insulating member and the winding come into strong contact due to the tension when the winding is wound. As a result, damage to the winding insulating coating, damage to the insulating member due to pressing of the winding (compression depression), and the like are likely to occur. As a result, poor insulation of the winding and breakage of the inner flange portion starting from a damaged portion of the insulating member due to a large force applied during the magnetizing step occurred.

In addition, since the teeth insulating portion of the insulating member is thin, it is difficult to remove (release) it from the mold.
Cracks occurred at corners where the winding drum section and the teeth insulating section intersected, resulting in insulation failure of the insulating member.
Further, there is a problem that the insulating film of the winding is damaged by burrs generated in a gap between a mating surface (parting surface) between the fixed mold and the movable mold.

[0011] Also, in the motor section in which only the thicknesses of the stator core and the rotor are changed, the length of the teeth insulating section is determined for the integral insulating member, and the insulating member having the same shape and size may be used as it is. could not.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerant compressor provided with a motor having high reliability and excellent productivity.

[0013]

According to a first aspect of the present invention, there is provided a refrigerant compressor which compresses and discharges a refrigerant, a stator for driving the compression mechanism, and a compressor. In a refrigerant compressor having an electric motor unit composed of a rotor and the stator, a plurality of teeth are radially installed integrally with a yoke that is an annular yoke,
A winding is wound around each tooth portion via an insulating member. The insulating member is a resin molded product, and is formed by connecting an inner flange portion and an outer flange portion and connecting the inner and outer flange portions to each other. And a body on which the wire is wound, wherein the body is in close contact with one end surface of the teeth portion,
It consists of a pair of teeth insulating parts provided integrally on both ends of the winding drum part and extending along both side surfaces of the teeth part, and a corner part which is a connecting part between the winding drum part and the teeth insulating part, It is characterized in that an R chamfer of 1/2 or more of the wire diameter of the winding is provided.

According to a second aspect of the present invention, in the refrigerant compressor according to the first aspect, the winding drum portion forming the winding drum of the insulating member is:
It is characterized in that it is formed to project on a smooth convex surface.

According to a third aspect of the present invention, in the refrigerant compressor according to the first aspect, the insulating member includes a tip end thickness T1 of the teeth insulating portion forming the body portion, and a base thickness of a corner portion between the winding body portion and the teeth insulating portion. The relationship of T2 is set so that T1> T2.

According to a fourth aspect of the present invention, in the refrigerant compressor according to the second aspect, the insulating member has a thickness Tc of a convex portion surface on which a winding drum portion forming a trunk portion is formed and a tip thickness T1 of a tooth insulating portion. Is set such that Tc> T1.

According to a fifth aspect of the present invention, in the refrigerant compressor according to the first aspect, the motor unit includes a non-magnetized permanent magnet embedded in the rotor, and a current passed through each winding of the stator to allow the motor to rotate. The permanent magnet is magnetized, the stator has six slots, and the rotor has four poles.

According to a sixth aspect of the present invention, in the refrigerant compressor according to the first aspect, the mold for molding the insulating member has a mold dividing surface where a tooth insulating portion is formed at a tip end of the tooth insulating portion insertion side. It is characterized by having been provided.

According to a seventh aspect of the present invention, in the refrigerant compressor according to the first aspect, the mold for molding the insulating member includes a surface roughness S1 of the insulating member surface formed by the fixed mold and a movable mold. Is characterized in that the relationship with the surface roughness S2 of the insulating member surface formed by (1) is set to S1 <S2.

[0020] Claim 8 is Claim 1 and Claim 3
In the refrigerant compressor according to any one of the above, the insulating member is fitted from both end surfaces of the teeth portion, and the leading ends of the insulating members overlap each other by 2 mm to 10 mm.

According to a ninth aspect of the present invention, in the refrigerant compressor according to the first aspect, the insulating member is fitted from both end surfaces of the teeth portion, and a separate insulating member is interposed between tips of the insulating members. It is characterized by the following.

By adopting the means for solving the above problems, damage to the insulating coating of the winding and the insulating member can be improved, and insulation failure or breakage of the insulating member when magnetized can be prevented. The same shape of the insulating member can be adopted for products having different thicknesses, so that productivity is improved and reliability is improved.

[0023]

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

In FIG. 1, reference numeral 1 denotes a hermetic refrigerant compressor, and reference numeral 2 denotes an accumulator. The refrigerant compressor 1 is provided with a compression mechanism 4 at a lower part in a closed case 3 and an electric motor part 5 at an upper part. The compression mechanism 4 and the electric motor 5 are connected via a rotating shaft 6.

The electric motor unit 5 includes a stator 8 fixed to the inner surface of the sealed case 3, a rotor 8 disposed inside the stator 8 with a predetermined gap, and the rotary shaft 6 interposed therebetween. 9.

The compression mechanism 4 is composed of two cylinders 1 disposed vertically below a rotary shaft 6 via a partition plate 10.
1A and 11B. The upper surface of the upper cylinder 11 </ b> A is attached and fixed to the main bearing 12. An auxiliary bearing 13 is attached and fixed to the lower surface of the lower cylinder 11B.

The upper and lower surfaces of the cylinders 11A and 11B are partitioned by the partition plate 10, the main bearing 12 and the auxiliary bearing 13, and cylinder chambers 15a and 15b are formed therein. In each of the cylinder chambers 15a and 15b, so-called rotary compression mechanisms 16A and 16B are configured, in which the rollers are eccentrically driven in rotation with the rotation of the rotary shaft 6 and the cylinder chamber is partitioned into a high pressure side and a low pressure side by vanes. You. Cylinder chamber 15 in both cylinders 11A and 11B
a and 15b are connected to the accumulator 2 via the conducting tubes 17a and 17b, respectively.

On the other hand, a discharge refrigerant pipe 19 is connected to the upper surface of the closed case 3 and communicates with a condenser (not shown). A suction refrigerant pipe 21 is connected to the upper surface of the accumulator 2 and communicates with an evaporator (not shown). An expansion mechanism is connected between the condenser and the evaporator, and a refrigeration cycle configured to sequentially communicate with the accumulator 2 via a refrigerant compressor 1-a condenser-an expansion mechanism-an evaporator is configured.

FIGS. 2A and 2B are a plan view and a front view, respectively, of the electric motor unit 5. A rotor 9 is arranged inside a stator 8. The stator 8 includes a yoke portion 32 which is an annular yoke, and a plurality (six) of teeth portions 33 radially installed at predetermined intervals inside the yoke portion. A stator iron core 30 is provided.

The teeth portion 33 is covered with an insulating member 40 as described later, and the winding 31 is provided through the insulating member. 2A shows the winding 31 with the insulating member 40 omitted, and FIG. 2B shows a state in which a part of the insulating member 40 protrudes from the upper and lower end surfaces of the stator core 30.

The number of slots (teeth portions 33) in the stator 8 is set to six, and the number of poles of the rotor 9 is set to four.
A winding 31 for the stator core 30 is provided so as to be set to the pole.

The rotor 9 includes a yoke portion 35 and a plurality (four) of permanent magnets 36 embedded in the yoke portion 35.
Consists of The permanent magnet 36 is assembled in a non-magnetized state, and magnetized after being assembled as the electric motor unit 5.

FIG. 3 shows a single-type insulating member 40A fitted into each of the six teeth portions 33 from the upper side and the lower side, and a total of 12 insulating members are prepared.

The insulating member 40A comprises an inner flange portion A and an outer flange portion B, and a body portion C connecting the inner and outer flange portions A and B to each other. In particular, the body C is formed in a substantially U-shape in a state in which the body C is formed in a cross section.
, And a pair of surfaces integrally provided at both ends of the winding body and along both side surfaces of the tooth portion 33 are referred to as tooth insulating portions d and d, and f is a tip of the tooth insulating portion d.

In the same figure, the crosses (-) indicate the position of the gate which is a resin injection port when the insulating member 40 is molded, and at least one of the inner flange portion A and the outer flange portion B is provided. It is provided facing one side.

Further, an insulating member 40B as shown in FIG. 4 may be used. In the case of the insulating member 40B, it is an entire type including an upper insulating member 40Ba fitted from the upper side and a lower insulating member 40Bb fitted from the lower side over all six teeth portions 33,
Therefore, only two are required.

FIG. 5A shows an insulating member 40 of the whole type.
FIG. 4B is a plan view of the upper insulating member 40Ba of B, which is fitted from above the teeth 33, and FIG. 4B is a cross-sectional view taken along line bb of FIG.

FIG. 6A shows an insulating member 40 of the whole type.
FIG. 4B is a plan view of a lower insulating member 40 </ b> Bb fitted from below the teeth portion 33, which constitutes B, and FIG. 4B shows a bb cross section of FIG. FIG. 7 is a perspective view of an entire-type insulating member 40B, of which an upper-side insulating member 40Ba.

Upper and lower insulating members 40Ba, 40Bb
Is, as shown in FIG. 5 (a), FIG. 6 (a) and FIG.
Inner flange A and outer flange B, and inner and outer flanges A,
B and a trunk C connecting the two.

In particular, as shown in FIGS. 5 (b) and 6 (b), the teeth 3
The surface close to one end surface of the tooth 3 is referred to as a winding drum portion c, the opposing surfaces along both side surfaces of the tooth portion is referred to as a tooth insulating portion d, and f is a tip of the tooth insulating portion d.

As an embodiment corresponding to claim 1, the insulating member 40 described above (specifically, 40A, 40B
5 (b) and FIG. 6 (b), a corner portion 41 which is a boundary between the winding drum portion c and the teeth insulating portion d has a wire diameter 1 of the winding 31 described above. / 2 or more R chamfers are provided.

In order to confirm the effect of the insulating member 40 described above, a winding is applied to an insulating member in which the radius of the R-chamfer of the corner portion 41 is variously changed. The deformation state of the cross section, the dent deformation at the corner, the broken state of the inner flange A after magnetization, and the like were evaluated.

Specifically, the insulating member 40 is connected to the stator core 30
And the winding 31
Is performed by setting a constant tension and a constant winding speed. At this time, the inner flange portion A of the insulating member 40
Is 50 to 100 kgf.

As a material of the insulating members 40A and 40B, a PPS resin (polyphenylene sulfide) material is selected.

The wire diameter of the winding 31 is φ1.0 mm, and as shown in FIG.
R: 0.1, R: 0.3, R: 0.5, R: 1.0,
R: Performed with five types of 2.0 (mm).

FIGS. 9A to 9D illustrate the details of the evaluation obtained under the above conditions. That is, in FIG. 9A, the state of breakage of the insulating film 42 covering the winding 31 after winding was observed. In FIG. 9B, the amount of deformation of the winding 31 after winding with respect to the initial wire diameter was measured. FIG.
9 (c), the amount of depression of the corner portion 41 of the insulating member 40 was measured, and FIG. 9 (g) shows a gg section of FIG. 9 (c). In FIG. 9D, the presence or absence of cracks at the base of the inner flange A after magnetization was confirmed.

The above four items were evaluated, and the evaluation results are summarized in Table 1 below. The deformation of the winding after the winding and the depression of the corner portion 41 are R: 0.5 (m) in Table 1.
m) are shown as relative values when the specification is set to 1.0.

[0048]

[Table 1]

From the above results, according to the specifications, the insulation film 42 on the surface of the winding 31 was not damaged and the winding 3
1 and the deformation of the insulating member 40 can be small. It was also found that no cracks occurred at the root of the inner flange A after the magnetization.

On the other hand, according to the specifications, since the radius of chamfering is small, stress is concentrated at the corner 41, and the insulating coating 42 is damaged and the winding 31 is deformed. Becomes large. Further, it has been found that, during magnetization, the inner flange portion A concentrates stress on the dent portion due to a force to fall down to the rotor 9 side, and this dent becomes a starting point to cause cracks.

That is, the radius of chamfer is set to 1/2 (0.5
By setting the above, the stress concentration at the time of winding can be reduced, and the reliability can be improved. However, R
Increasing the chamfer reduces the thickness of the corner portion 41 and lowers the strength of the insulating member 40. Therefore, the R chamfer is preferably in the range of 1/2 to 4 times the wire diameter.

An embodiment corresponding to claim 2 is shown in FIG.
Is shown in Here, the surface of the winding drum portion c in the drum portion C forming the insulating member 40 is formed as a gently convex convex portion 44. The convex portion 44 has a height (convex height) that comes into contact when the winding 31 is wound.

As shown in FIG. 8A, in the normal configuration, a winding gap 43 is formed between the winding body c and the winding 31, so that stress concentrates on the corner 41. .
However, by forming the protrusions 44 shown in FIG. 10, the protrusions receive part of the tension of the winding 31 and the winding gap as described above does not occur. Therefore, the contact force of the winding 31 with respect to the corner 41 is reduced, the damage of the insulating coating 42 of the winding is prevented, and the depression of the corner 41 can be prevented.

The convex portion 44 has a distance between both corner portions 41 of the winding drum portion c, an R shape of the corner portion 41,
The winding 31 and the insulating member 40 are set depending on various conditions such as the wire diameter and elastic force of the winding 31 and the tension of the winding 31.
The effect is greater as the contact length is longer.

The sectional shape of the convex portion 44 is shown in FIG.
Although a gentle arc shape is preferable over the entire surface as shown in FIG. 11, the present invention is not limited to this, and a convex portion 44a having only a central portion as shown in FIG. As shown in FIG. 11B, a similar effect can be obtained by forming a concave portion at the center portion and forming convex portions 44b on both sides thereof.

FIG. 12 shows an embodiment corresponding to claim 3.
And FIG. First, as shown in FIG.
The relationship between the thickness T1 of the tip f of the teeth insulating portion d and the base side of the tip and the thickness T2 of the corner portion 41 was set to T1> T2.

After setting the above dimensions, the upper insulating member 40Ba and the lower insulating member 40Bb are fitted as shown in FIG. The overlapping margins f obtained by overlapping the leading ends f of these insulating members are in contact with each other, so that the overlapping margins are pressed down, and the gap between the overlapping margins f is filled, so that the insulation characteristics are improved.

According to the relationship T1> T2 described above,
In particular, T1 is the contact thickness when winding 31 is wound.
That is, by having this thickness T1, the winding 3
By receiving a part of the tension of 1, the contact force of the winding with respect to the corner portion 41 is reduced, and the same effect as the above-described convex portion 44 is obtained. In addition, it is more effective if the cross-sectional shape of the winding drum portion c is the same gentle arc-shaped surface as the convex portion 44.

FIG. 12 and FIG.
2 shows an embodiment corresponding to FIG. That is, first,
As described with reference to FIG. 10, the relationship between the thickness Tc of the convex portion 44 of the winding drum portion c and the thickness T1 on the tip end f side of the teeth insulating portion d is set to Tc> T1.

This is because even if T1 is small, the distance between the corner portions 41 of the upper insulating member 40Ba and the lower insulating member 40Bb is longer than the distance between the corner portions 41 on both sides of the winding drum portion c. The windings 31 can make sufficient contact.

On the other hand, the thickness Tc of the winding drum portion c may be increased by increasing the radius of the corner 41 of the insulating member and by increasing the height of the projection 44 because the distance between the corners 41 is short. As required, Tc must be thick. Therefore, further effects are exhibited by setting Tc> T1.

An embodiment corresponding to claim 5 will be described again with reference to FIGS. 1 and 2 (a). That is, in the DC motor as the electric motor unit 5, it is necessary to magnetize the permanent magnet 36 of the rotor 9 at the time of assembling. However, during this magnetization, the magnetizing current flows through the winding 31 of the stator 8, and the flange of the insulating member 40 may be deformed by the electromagnetic force of the winding 31.

At this time, cracks occurred due to the depressions formed in the insulating member 40. As shown in the results of Table 1, the use of the insulating member 40 having the above-described characteristics was achieved. Good results were obtained by preventing cracking due to electromagnetic force.

FIG. 14 shows an embodiment corresponding to claim 6.
(A) to (c) and FIGS. 15 (a) and (b).
First, referring to FIG. 15, FIG. 15A is a schematic configuration of the injection molding process, and includes an injection molding machine 60, a mold 46, and a movable mold 4 constituting the mold.
7 and the fixed mold 48, and a dividing surface 49 (parting surface) of each mold 47, 48, and the like. FIG.
Shows an enlarged view of only the mold 46 described above.

To begin with the injection molding by the injection molding machine 60, a resin material is put into a hopper 63 connected to the injection molding machine 60. Processing machine cylinder 6
In 1, the screw 62 rotates and sends the resin material put into the hopper 63 to the tip side. On the way, cylinder 6
The charged resin material is heated and melted by the heater H embedded in the thickness of the resin material. The fluorine resin melted by the retreat of the screw 62 is stored at the tip side, and the molten fluorine resin is injected into the mold 46 by the straight movement of the screw 62.

The temperature of the mold 46 is set to a temperature at which the molten resin is cooled and solidified. The molten resin injected from the processing machine 60 through the injection path 53 of the fixed mold 48 constituting the mold 46 is guided into the cavity from the injection port 54 as a gate, where it is collected and collected. Cooling and solidifying based on a predetermined time setting
Will be formed. In addition, the position of the injection port 54 serving as the gate is provided on at least one of the inner flange portion A and the outer flange portion B of the body portion C.

At a timing when the molten resin is cooled and solidified in the cavity, the movable mold 47 is driven backward,
The movable mold 47 and the fixed mold 48 are divided at the position of the division surface 49. At this time, the injection port 54 is cut off from the formed insulating member 40.

The protruding plate 52 advances with respect to the insulating member 40 remaining in the movable mold 47, and the protruding pin 50 provided here pushes out the insulating member 40 and removes it from the mold 46.

More specifically, as shown in FIG. 2B, the fixed mold 48 is formed by a first divided mold 48a and a second divided mold 48a.
The injection path 53 can be taken out by opening the split molds 48a and 48b to each other.

After removing the cooling and solidified resin in the insulating member 40 and the injection path 53 from the split molds 48a and 48b, the movable mold 47 and the fixed mold 4 are removed.
8 is closed and the same process is repeated again.

FIGS. 14 (a) to 14 (c) are partial cross-sectional views showing the state of the mold dividing surface 49 of the portion constituting the teeth insulating portion d. A dividing surface 49 is provided at a position corresponding to the tip e of the tooth insulating portion d.

The shape of the tooth insulating portion d in the thickness direction is divided into a fixed mold 48 and a movable mold 47 shown in FIG. 14B and an insulating member 40 shown in FIG.
There is provided a slope (taper) necessary for taking out the slab. Therefore, the thickness of the tooth insulation portion d is
<This is the relationship of the tip e, and by providing such a divided surface 49, the resistance when the insulating member 40 is removed from the mold can be reduced, and the occurrence of cracks can be prevented.

More specifically, since the stator core 30 is formed by laminating magnetic steel plates, the corners of the teeth 33 cannot be chamfered or the like, and the corners of the insulating member 40 located at these corners cannot be formed. 41 also cannot be subjected to large chamfers. If the resistance when removing the molded insulating member 40 from the mold is large, the corner portion 4
In this case, concentrated stress is generated at the point 1 and causes a crack.

However, here, the above-described divided surface 4
Due to the presence of 9, the movable mold 47 is opened, and at the same time, one surface of the tooth insulating portion d is opened. Further, since the insulating member 40 remaining in the movable mold 47 is pushed up and taken out by the protruding pin 50, the frictional resistance between the movable mold 47 and the insulating member 40 is greatly reduced, and the corner 4
The load on 1 is reduced to prevent the occurrence of cracks.

Further, burrs 51 generated on the dividing surface 49 are formed.
However, since the winding 30 is formed at a position distant from the corner portion 41 that receives the most stress, even if the burr 51 remains in the manufacturing process, the stress on the winding 30 is small, Failure can be prevented.

As for the burr removal processing, the burr 51 is generated at the tip end e, and compared with the burr generated at a deep position such as in the teeth insulating portion d.
Deburring is easy. Further, the relationship of the thickness T1> T2 of the teeth insulating portion d according to claim 3 can be easily formed by this mold configuration.

The effect is greater as the above-described dividing surface 49 is closer to the tip e of the insulating member d.
Although it is desirable to provide the dividing surface 49 at the forefront, FIG.
The upper and lower insulating members 40Ba and 40Bb fitted from the upper and lower sides shown in FIG.
Depending on the shape of the overlap allowance f, it may be difficult in terms of the mold configuration.

FIG. 16 shows a mold structure as a comparative example. That is, the following mold configuration is also conceivable. Here, the division surface 49 is provided near the corner portion 41, and the teeth insulating portion d is entirely formed in the movable mold 47.
Therefore, the thickness of the teeth insulating portion d in order to provide an inclination necessary to take out the insulating member 40 from the movable mold 47 has a relationship of winding drum portion c <tip e (T1 <T2).

Further, it is necessary to reduce the thickness and the inclination so that the insulation distance between the stator core 30 and the winding 31 cannot be increased. Therefore, the resistance when the insulating member 40 is removed from the movable mold 47 is large, and there is a possibility that cracks may occur in the corners.

FIG. 17 shows an embodiment corresponding to claim 7.
Is shown in Assuming the mold configuration of claim 6, the relationship between the insulating member surface roughness 46a formed by the fixed mold 48 and the insulating member surface roughness 46b formed by the movable mold 47 is 44a <44b. It is set to be.

Basically, the surface roughness of the insulating member 40 is determined by the surface roughness of the mold because the surface roughness of the mold is transferred. Specifically, if the surface roughness of the fixed mold 48 is set to be small, the surface roughness 46a of the insulating member 40 is reduced.

With such a setting, when the fixed mold 48 and the movable mold 47 are opened, the frictional resistance of the insulating member 40 with respect to the fixed mold 48 decreases, and the insulating member 4
The stress to zero is reduced. The load on the corner portion 41 is reduced to prevent the occurrence of cracks. Since the winding 31 is wound on the surface of the insulating member having the small surface roughness 46a, there is also an effect of preventing the winding insulating film 42 from being damaged.

An embodiment corresponding to claim 8 will be described with reference to FIG.
(A) and (b). In other words, the distance 55 at which the overlap allowance f overlaps at the tip of the insulating members 40Ba and 40Bb fitted from the upper side and the lower side is determined as shown in FIG.
In FIG. 18A, it is 2 mm, and in FIG. 18B, it is 10 mm.

Since the stator core 30 is formed by laminating magnetic steel sheets, manufacturing variations are likely to occur in the thickness direction. Therefore, the above-mentioned overlap margin f is set as the length 56 in consideration of the distance 55 that overlaps with the dimensional tolerance of the manufacturing variation.

Here, as described above, the relationship between the thicknesses T1 and T2 of the teeth insulating portion d is set to T1> T2, and the overlap margin f is suppressed by the winding 31, so that as shown in FIG. Even at a short distance of 2 mm, predetermined insulation properties were obtained.

Further, it is possible to increase the thickness of the overlap margin f, and the resin easily flows.
As shown in (b), molding can be performed even if the distance 55 is extended to 10 mm. Therefore, the overlapping distance 55 of the overlap allowance f is preferably in the range of 2 mm to 10 mm from the balance between the insulating properties and the formability.

In the mold configuration of the comparative example described above with reference to FIG.
In the case of <T2, a gap has to be formed between the overlap allowance and the winding to deteriorate the insulation properties, so the distance had to be set to 4 mm.

Further, the resin does not flow because the thickness of the overlapping margin is small, and the distance is limited to 6 mm from the viewpoint of molding. In other words, it is desired to secure a long distance from the viewpoint of insulation properties, but there is a limit on the distance in the molding process, and it is necessary to minimize the manufacturing variation of the stator core.

Therefore, by configuring the distance 55 in the range of 2 to 10 mm as in the above-described embodiment, even if the manufacturing variation of the stator core 30 is large, it is possible to cope with the problem and improve the manufacturability.

An embodiment corresponding to claim 9 is shown in FIG.
Shown in

That is, a separate intermediate insulating member 57 having an overlapping margin f that matches the insulating members 40B _a1 and 40B _b1 fitted from the upper side and the lower side is provided.
The intermediate insulating member 57 has a cross section of the same shape as that of the tooth insertion portion d, and includes upper and lower insulating members 40B _a1 and 40B _b1.
Are overlapped, and an overlap margin f is formed. By interposing the intermediate insulating member 57 between them, even if the thickness of the stator core 33 increases, there is no need to prepare a new mold, and the insulating member 40B can be used as it is.

The motor section 5 improves the efficiency of the compression mechanism section 4 and compensates for the lack of torque by the thickness of the stator core 33. For this reason, by providing the intermediate insulating member 57, the range of use of the insulating member 40B is expanded and the manufacturability is excellent.

[0093]

As described above, according to the present invention, damage to the insulating coating of the winding and the insulating member can be improved, defective insulation and breakage of the insulating member when magnetized can be prevented, and the thickness of the stator core can be reduced. Thus, the same shape of the insulating member can be used for products having different characteristics, thereby improving the productivity and achieving an effect of improving reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a refrigerant compressor according to an embodiment of the present invention.

FIG. 2 is a plan view and a front view of a motor unit according to the embodiment.

FIG. 3 is a front view of the split type insulating member of the embodiment.

FIG. 4 is a diagram showing insulating members and gate positions of different specifications of the embodiment.

FIG. 5 is a plan view and a partial cross-sectional view of an upper-side insulating member as a whole type according to the embodiment;

FIG. 6 is a plan view and a partial cross-sectional view of a lower-side insulating member as a whole type according to the embodiment;

FIG. 7 is a perspective view of an upper-side insulating member of the whole type according to the embodiment;

FIG. 8 is a partial cross-sectional view of the teeth insulating portion to be fitted into the teeth portion of the embodiment, and a surface illustrating R of a corner portion.

FIG. 9 is a perspective view, a front view, and a partial cross-sectional view illustrating a damaged state of the embodiment.

FIG. 10 is a partial cross-sectional view showing a projection of the insulating member of the embodiment.

FIG. 11 is a partial cross-sectional view showing a protrusion of another modification of the insulating member of the embodiment.

FIG. 12 is a partial cross-sectional view showing the thickness of the teeth insulating portion of the insulating member according to the embodiment.

FIG. 13 is a partial cross-sectional view showing the thickness of the teeth insulating portion in the embodiment with the upper and lower insulating members fitted to each other.

FIG. 14 is a partial cross-sectional view showing the configuration of a mold according to the embodiment and the operation during molding.

FIG. 15 is a sectional view showing an injection molding machine and a mold, and a sectional view of the mold according to the embodiment.

FIG. 16 is a partial cross-sectional view showing the configuration of a mold and the operation during molding as a comparative example.

FIG. 17 is a partial cross-sectional view illustrating surface states of a mold and an insulating member according to the embodiment.

FIG. 18 is a partial cross-sectional view showing the overlap of the upper and lower sides of the insulating member according to the embodiment.

FIG. 19 is a partial cross-sectional view showing a configuration of a separate insulating member of the embodiment.

[Explanation of symbols]

 4 Compression mechanism section, 8 stator, 9 rotor, 5 electric motor section, 32 yoke section, 33 teeth section, 30 stator core, 40 insulating member, 40A insulating member, 40B insulating Reference numeral 31: winding wire, A: inner flange portion, B: outer flange portion, C: trunk portion, c: winding trunk portion, d: teeth insulating portion, 41: corner portion, 44: convex portion, 47: movable side Mold, 48: Fixed mold, 57: Intermediate insulating member.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H003 AA05 AB04 AC03 AD03 CA01 CA02 CD01 CD03 CD07 CE02 CE03 CE05 CF04 5H002 AA07 AB06 5H604 AA08 BB01 BB12 BB14 BB17 CC05 CC16 DA24 DB03 PB03 5H621 GA01 GA04 GB08

Claims (9)

[Claims] A compression mechanism for compressing and discharging the refrigerant;
In a refrigerant compressor including an electric motor unit including a stator and a rotor that drives the compression mechanism unit, the stator includes a plurality of teeth integrally formed with a yoke that is an annular yoke. It is installed radially, and a winding is wound around each tooth portion via an insulating member. The insulating member is a resin molded product, and includes an inner flange portion, an outer flange portion, and inner and outer flange portions. A body portion connected and wound around the winding portion, wherein the body portion is provided integrally with both ends of the winding body portion in close contact with one end surface of the teeth portion, and the teeth portion is provided integrally with both ends of the winding body portion. A pair of tooth insulation portions extending along both side surfaces of the winding portion, and a corner portion which is a connecting portion between the winding drum portion and the tooth insulation portion is provided with an R chamfer of 1/2 or more of a wire diameter of the winding. Refrigerant compressor characterized by the above-mentioned. 2. The refrigerant compressor according to claim 1, wherein the winding body forming the body of the insulating member is formed to project from a smooth convex surface. 3. A relationship between the tip thickness T1 of the teeth insulating portion forming the body portion and the root thickness T2 of the corner portion between the winding body portion and the teeth insulating portion is set as T1> T2. The refrigerant compressor according to claim 1, wherein: 4. In the insulating member, a relationship between a thickness Tc of a convex surface on which a winding drum portion forming the drum portion is formed and a tip thickness T1 of the teeth insulating portion is set to Tc> T1. The refrigerant compressor according to claim 2, wherein: 5. The motor section, wherein a non-magnetized permanent magnet is embedded in a rotor, and a current is passed through each winding of the stator to magnetize the permanent magnet of the rotor. 2. The refrigerant compressor according to claim 1, wherein the number of slots is six, and the number of poles of the rotor is four. 6. The mold according to claim 1, wherein the mold for molding the insulating member has a mold dividing surface for forming the teeth insulating portion provided at a tip end on the side where the teeth insulating portion is inserted. Refrigerant compressor. 7. A mold for molding the insulating member, wherein the surface roughness of the insulating member surface formed by the fixed mold is S1.
And the surface roughness S2 of the insulating member surface formed by the movable mold.
2. The refrigerant compressor according to claim 1, wherein the relationship is set to S1 <S2. 8. The insulating member is of a two-part type that is fitted from both end surfaces of the teeth portion, and the distal ends of the insulating members are set so as to overlap each other by 2 to 10 mm. The refrigerant compressor according to claim 3. 9. The insulating member according to claim 1, wherein said insulating member is fitted from both end faces of said teeth portion, and a separate insulating member is interposed between tips of said insulating members.
A refrigerant compressor as described in the above.