JP2001055979A - Cooling medium compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable cooling medium compressor prevented from causing the breakage of an insulating member when wound on tooth portions constituting a stator iron core via the insulating member, as part of a stator for a motor part, and during magnetizing a rotor, superior in adaptability of cooling medium to a refrigerator oil and less in oligomer extraction. SOLUTION: A cooling medium compressor has a compressor mechanism part and a motor part 5 constituted by a stator 8 and a rotor 9, the stator having a stator iron core 30 constituted by a yoke portion 32 as an annular yoke and a plurality of tooth portions 33. A winding 31 is wound on the tooth portions via an insulating member 40, and the insulating member is integrally molded with a resin molding or the tooth portions and constituted by an inside collar portion, an outside collar portion and a barrel portion on which the winding is wound. At least one of gates as resin fill ports in molding the insulating member is located on the inside/outside collar portion.

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 a refrigerator or an air conditioner, for example, and more particularly to an insulating member for a winding 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 the above-mentioned electric motor section, the pursuit of energy saving and comfort in the refrigeration cycle operation has been pursued.
A three-pole or four-pole three-phase winding is provided and driven by an inverter power supply.

[0004] For example, Japanese Patent Application Laid-open No. Hei 10
Japanese Unexamined Patent Publication No. -288180 describes in detail the technology of 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.

In recent years, refrigerants have been switched to HFC refrigerants from the viewpoint of destruction of the ozone layer, and materials that are compatible with HCFC22, which is a conventional refrigerant, and HFC410A, which is a new refrigerant, have been required for refrigerant compressors. I have.

[0006] When the refrigerant is switched, the refrigerating machine oil collected in the compression mechanism section has a high compatibility with the HCFC due to compatibility conditions.
When HFC410A is used, mineral oil is required, and when HFC410A is used, ester oil and polyether oil are required. In addition, HC refrigerant is cited as a next-generation alternative refrigerant to HFC as a new refrigerant, and mineral oil is considered as a suitable refrigerating machine oil, for example.

[0007]

The above-mentioned insulating member is integrally formed along a winding drum portion formed of a rectangular frame fitted into a tooth portion having a rectangular cross section, and along an inner peripheral edge and an outer peripheral edge of the winding drum portion. It consists of an inner flange portion and an outer flange portion which are provided in a standard manner.

When such an insulating member is molded, a resin material is injected from a gate (so-called resin injection port) to be solidified. However, when the gate is provided only in the winding body, If the thickness relationship between the winding drum section and the inner flange is inappropriate, the inner flange may break due to the winding tension of the winding during winding or when magnetizing the rotor magnet with a DC motor. Easy, impairing mass productivity.

The above drawback is that the strength varies depending on the material,
It also differs depending on the amount of glass fiber to be mixed and the amount of filler. Also, if the compatibility between the refrigerant and the refrigerating machine oil is insufficient as the base resin, oligomers (so-called impurities) of low molecular weight components may be extracted, or if natural paraffin wax is used as the internal mold release material, the HFC refrigerant system may be used. The problem is clogging the refrigeration cycle.

[0010] The present invention has been made based on the above circumstances, and has an object to provide a stator of a motor unit when the stator unit is wound around teeth constituting a stator core through an insulating member; and An object of the present invention is to provide a reliable refrigerant compressor that reliably prevents breakage of the insulating member when the rotor is magnetized, has excellent compatibility with the refrigerant and the refrigerating machine oil, and has low oligomer extraction. It is.

[0011]

In order to satisfy the above-mentioned object, a refrigerant compressor of the present invention has a compression mechanism for compressing and discharging a refrigerant and lubricating with refrigerating machine oil. An electric motor unit including a stator and a rotor that drives a compression mechanism unit, wherein the stator includes a yoke portion that is an annular yoke and a plurality of radially installed inside or outside the yoke portion. And a stator core formed by winding a winding around the teeth of the stator core through an insulating member. The insulating member is formed by resin molding to be fitted into the teeth. Or an integral molding with the teeth portion, and is constituted by an inner flange portion and an outer flange portion, and a winding trunk portion around which the winding is wound, connecting the inner and outer flange portions. Mold The position of the gate is a resin injection port at the time, at least one thereof, characterized in that provided on one of said inner flange portion and the outer collar portion.

According to a second aspect, in the refrigerant compressor according to the first aspect, the insulating member has a flexural modulus of 5 GPa.
As described above, a resin mold material having a bending strength of 18 MPa or less and a bending strength of 200 MPa or more is selected.

According to a third aspect of the present invention, in the refrigerant compressor according to the first aspect, the insulating member has a winding body having a thickness of at least 10% larger than a thickness of the inner flange, and the insulating member and the inner flange are wound. A corner portion intersecting with the body portion is set to R1 mm or more.

According to a fourth aspect of the present invention, in the refrigerant compressor according to the first aspect, the gate for molding the insulating member is provided at one point at the tip of the inner flange portion or at the tip of the inner flange portion with respect to one tooth portion. It is characterized in that it is provided at two places with the tip of the flange, or at two places with either the inner or outer flange and the winding body.

According to a fifth aspect of the present invention, in the refrigerant compressor according to the first aspect, PPS (polyphenylene sulfide) or PA is used as a resin mold material constituting the insulating member.
(Polyamide), PBT (polybutylene terephthalate), or LCP (semi / fully aromatic polyester [liquid crystal polymer]), a material with or without glass fiber is selected, and natural paraffin wax is contained as a release agent It is characterized by not having.

According to a sixth aspect, in the refrigerant compressor according to the fifth aspect, the PPS (polyphenylene sulfide) is used.
The above PBT is a linear type glass fiber-containing material having an oligomer content of 1.0 wt% or less.
(Polybutylene terephthalate) is characterized by being a material containing glass fiber and having an oligomer content of 1.5% by weight or less.

According to a seventh aspect of the present invention, in the refrigerant compressor according to the first aspect, the electric motor section includes a non-magnetized permanent magnet embedded in the rotor, and a current passed through each winding of the stator. The permanent magnet is magnetized, the number of slots of the stator is set to six, and the number of poles of the rotor is set to four.

According to an eighth aspect, in the refrigerant compressor according to the first aspect, HCFC, HFC, or HC is used as the refrigerant, and mineral oil, alkylbenzene-based oil, ester-based oil, and polyvinyl ether-based are used as the refrigerating machine oil. It is characterized by combining oils.

By adopting the means for solving the problems as described above, when the stator of the electric motor is wound around the teeth constituting the stator core via an insulating member,
In addition, when the rotor is magnetized, the breakage of the insulating member is reliably prevented, the compatibility between the refrigerant and the refrigerating machine oil is excellent, and the extraction of the oligomer is small.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. First, an embodiment according to claims 1 to 3 will be described. 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 has a stator 8 fixed to the inner surface of the sealed case 3, a rotating member 6 disposed inside the stator 8 with a predetermined gap, and a rotating shaft 6 interposed therebetween. And child 9.

The compression mechanism 4 includes two cylinders 1 arranged 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 disposed 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. It has a stator core 30 formed by lamination.

The teeth portion 33 is covered with an insulating member 40 as described later, and the winding 31 is provided through the insulating member. In FIG. 2A, the insulating member 4
0 is omitted to show the direct winding 31, 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.

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

The rotor 9 comprises a yoke portion 35 and a plurality (four in this case) of permanent magnets 36 buried in the yoke portion 35 and bent into an inverted circular cross section. The permanent magnet 36 is assembled in a non-magnetized state, and is magnetized after being assembled as the motor unit 5.

In contrast to the so-called inner rotor type electric motor unit 5 having the rotor 9 inside the stator 8 as described above, depending on the model, a stator having a plurality of teeth outside the stator yoke may be used. In addition, there is also an outer rotor type electric motor unit having a rotor outside the stator. Here, only the former motor unit will be described.

FIG. 3 shows a single-type insulating member 40A fitted into each tooth 33 from the upper side and the lower side. A total of twelve insulating members 40A are provided, each of which has an inner flange portion a and an outer flange portion b, and a winding drum portion c which connects these inner and outer flange portions a and b, and on which the winding 31 is wound. It is composed of

The crosses shown in FIG. 3 indicate the position of the gate which is the resin injection port when molding the insulating member 40A. The leading end or the proximal end, and the winding drum section c.

As shown in FIG. 4, the insulating member 40A is of a single type, and has different cross-sectional shapes, and the position of the corresponding gate (marked by x).
Shows the case where is set up to. Regardless of the type, a gate for molding is provided at one point at the tip of the inner flange portion a. In addition, is shown as a comparative example, and the position of the gate was set to the winding drum section c.

Alternatively, an insulating member 40 as shown in FIG.
B may be used. In this case, the entire type is fitted from the upper side and the lower side over all the teeth portions 33, and thus two are prepared.

FIG. 6A shows an entire type of insulating member 40B.
FIG. 4B is a plan view of the upper insulating member fitted from above the teeth portion 33, FIG. 4B is a cross-sectional view taken along line BB of FIG. 4A, and FIG. The (A) CC section is shown.

FIG. 7A shows a whole type of insulating member 40B.
FIG. 4B is a plan view of the lower insulating member fitted from below the teeth portion 33, FIG. 4B is a cross-sectional view taken along the line BB of FIG. 4A, and FIG. The CC section of A) is shown. FIG. 8 shows an upper type insulating member 40B of the whole type.
FIG.

As the whole type of insulating member 40B, the inner flange portion a and the outer flange portion b, and the inner and outer flange portions a and b are connected to each other and the winding drum portion c around which the winding 31 is wound. Be composed. The insulating member 40B is also used for the teeth 3
3 is a resin molded product to be fitted into the teeth portion 33, which is a separate component. Alternatively, depending on the type of the insulating member, it may be molded integrally with the teeth 33.

As shown in FIGS. 5 to 7, the position of the gate (indicated by a cross in the figure), which is a resin injection port when molding the insulating member 40B, is at least one of which is inside and outside. It is characterized in that it is provided on the flange portions a and b.

In molding the above insulating members 40A and 40B, a strength test was conducted for the above-mentioned gates having different positions of the gates, and the strength against falling down of the inner flange portion a was obtained.

More specifically, as shown in FIG. 9, the insulating member 40A is sectioned and placed so that the tips of the inner flange portion a and the outer flange portion b are in contact with a slope H inclined at a predetermined angle. A strength test was performed in which a load F was applied to the corner between the portion a and the winding drum portion c.

As a result, as shown in FIG. 10 (A), a change in the flexural modulus (GPa) with respect to the compressive strength (%) is obtained.
It is necessary to secure the pressure not less than GPa and not more than 18 GPa.

As shown in FIG. 10B, a change in bending strength (MPa) with respect to compression strength (%) is obtained.
Flexural strength 200MPa as ideal material for insulating member 40
It is necessary to secure the above.

As described above with reference to FIG. 4, detailed dimensional relationships when the gate positions are variously changed are shown in Table 1. Here, the actual thickness of the inner flange portion a in each specification, the thickness of the winding drum portion c, and the dimension of the R portion where the inner flange portion a and the winding drum portion c intersect are set, and are shown above. Such a strength test was performed. The winding 31 in assembling the stator 8 was performed at a constant tension and winding speed, the load applied to the flange was 500 to 100 kgf, and PPS (polyphenylene sulfide) was selected as a material.

[0043]

[Table 1]

FIG. 11 is a graph showing the intensity ratio in Table 1. From the above results, it was found that the specification was the most excellent, and the strength was maximized by setting the thickness of the winding drum portion c to be 10% thicker than the flange portion. In order to prevent concentration of stress in the R portion, R1 mm or more is necessary, and preferably R2 mm or more.

As shown in the comparative example, when the gate position is provided only at the winding drum portion c, the strength of the inner flange portion a decreases due to the orientation of the resin. As described above, the case where the gate position is provided at the tip of the inner flange portion a is the strongest and can withstand the actual winding 31.

By molding the insulating member 40 after selecting the gate position in this manner, when the winding 31 is formed on the winding drum portion c, the inner flange portion a does not fall, and the stator 8 does not fall. The result that the assemblability of this was good was obtained.

As an embodiment corresponding to claim 4, the position of the gate is set as follows. That is, as the second specification, it is provided at two places, the tip of the inner flange portion a and the tip of the outer flange portion b. As a third specification, it is provided at two places, the tip of the inner flange portion a and the winding drum portion c. As a fourth specification, an inner flange portion a
In two places. Even with the above gate position setting,
There was obtained a result that the inner flange a at the time of the winding 31 did not fall down and the assemblability of the stator 8 was good.

The following is the selection of the material constituting the insulating member 40 according to the fifth and sixth embodiments. Select PPS (polyphenylene sulfide),
Linear type with glass fiber, no filler,
When a non-natural paraffin wax is used as the internal release agent, the content of the oligomer is 0.6 wt%. Crosslinked type P
PS contains too many oligomers and is not suitable. Further, when the filler is filled, the strength of the flange portion is insufficient, which is not preferable. The glass fiber content may be between 10% and 60%.

When PBT (polybutylene terephthalate) is selected and is a hydrolysis-resistant type or a low-oligomer type having a glass fiber content of 30% and no internal mold release agent, the contained oligomer is 0.8%. Normal PB
In T, the amount of oligomer is large, and natural paraffin wax is used as an internal release agent, which is not preferable. The glass fiber content may be 10% to 40%.

PA (polyamide) 6 or PA6
When 6 was selected and the glass fiber content was 30% and no internal release agent was used, the content of oligomer was 1.0% by weight. The glass fiber content may be 0 to 40%.

When LCP (semi-wholly aromatic polyester [liquid crystal polymer]) was selected, the amount of glass fiber was 40%, and when an agent other than natural paraffin wax was used as an internal release agent, the content of oligomer was 0.5 wt%. .

As an embodiment of the present invention, as shown in FIGS. 1 and 2A again, the rotor 9 constituting the electric motor unit (DC brushless motor) 5 together with the stator 8 is described.
Consists of a yoke portion 35 and a plurality of permanent magnets 36 embedded in the yoke portion 35 and bent into an inverted circular cross section. In the case of a DC motor, in order to fit the permanent magnet 36 into the rotor 9, Magnetization is required during assembly.

At the time of this magnetization, the magnetizing current flows through the winding 31 of the stator 8 and the winding 31 is deformed by the electromagnetic force. By using the insulating member 40 having the above-described characteristics, Good results were obtained without falling due to electromagnetic force and preventing cracking.

According to an eighth embodiment, the refrigerant is R2
In Refrigeration oil 2 is a combination using 4 GSD and refrigerant 41
At 0 A, the refrigerating machine oil was a combination using a polyol ester oil.

When the refrigerant is R410, there is no problem even if the refrigerating machine oil is polyether oil. Further, good results were obtained by using a propane refrigerant as the HC refrigerant and a mineral oil as the refrigerating machine oil and using the refrigerant compressor of FIG. 1 to constitute an air conditioner.

A refrigerator R as shown in FIG.
0. In the refrigerant compressor C constituting the refrigeration cycle together with the condenser 51, if isobutane is used as the refrigerant and mineral oil is used as the refrigeration oil, it is optimal for low temperature use.

[0057]

As described above, according to the refrigerant compressor of the present invention, when the stator of the motor is wound around the teeth constituting the stator core via the insulating member, the rotor is used. When magnetized, breakage of the insulating member is reliably prevented, the compatibility between the refrigerant and the refrigerating machine oil is excellent, the amount of oligomers can be reduced, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a refrigerant compressor, showing 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 gate positions corresponding to insulating members having different specifications according to the embodiment.

FIG. 5 is a front view of the entire type of insulating member of the embodiment.

FIG. 6 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. 7 is a plan view and a partial cross-sectional view of a lower-side insulating member of the overall embodiment of the same type.

FIG. 8 is a perspective view of the upper-side insulating member of the overall embodiment of the same type.

FIG. 9 is a diagram illustrating a strength test method for the insulating member according to the embodiment.

FIG. 10 is a diagram showing a strength test result of the embodiment.

FIG. 11 is a diagram showing strength ratios at gate positions corresponding to insulating members having different specifications according to the embodiment.

FIG. 12 is a diagram showing a refrigeration cycle in a refrigerator according to another embodiment.

[Explanation of symbols]

 Reference numeral 4: compression mechanism, 8: stator, 9: rotor, 5: electric motor, 32: yoke, 33: teeth, 30: stator core, 40: insulating member, 31: winding, a: inside Flange, b: outer flange, c: wound body, 36: permanent magnet.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 3/44 H02K 3/44 Z 15/03 15/03 G (72) Inventor Yoshiaki Inaba Fuji Shizuoka Prefecture 336 Tatehara-shi, Tokyo Toshiba Carrier Co., Ltd.F-term (reference) PP11 QA10 QB01

Claims (8)

[Claims] 1. A refrigerant compressor comprising: a compression mechanism for compressing and discharging a refrigerant and lubricated by refrigerating machine oil; and a motor unit including a stator and a rotor for driving the compression mechanism. In the above, the stator includes a stator core composed of a yoke portion that is an annular yoke, and a plurality of teeth portions radially installed inside or outside the yoke portion. A winding is wound around the teeth via an insulating member, and the insulating member is molded integrally with the resin molded product or the teeth fitted into the teeth, and the inner flange and the outer flange and And a winding drum portion around which the inner and outer flange portions are connected, and a winding is wound. The position of the gate as a resin injection port when molding the insulating member is determined by at least one of One , The refrigerant compressor, characterized in that provided on one of said inner flange portion and the outer collar portion. 2. The insulating member has a flexural modulus of 5 GP.
2. The refrigerant compressor according to claim 1, wherein a resin mold material having a bending strength of not less than 18 GPa and a bending strength of not less than 200 MPa is selected. 3. The insulating member according to claim 1, wherein a thickness of the winding body is at least 10% larger than a thickness of the inner flange, and a corner portion where the inner flange and the winding body intersect is R1 mm or more. The refrigerant compressor according to claim 1, wherein the refrigerant compressor is set. 4. A gate for molding the insulating member is provided at one position at the tip of the inner flange portion with respect to one tooth portion, or at two positions at the tip of the inner flange portion and the tip of the outer flange portion, or at the inner and outer flanges. The refrigerant compressor according to claim 1, wherein the refrigerant compressor is provided at two positions, one of the portions and the winding drum portion. 5. A resin mold material for forming the insulating member, wherein PPS (polyphenylene sulfide), PA
(Polyamide), PBT (polybutylene terephthalate), or LCP (semi / fully aromatic polyester [liquid crystal polymer]), a material with or without glass fiber is selected, and natural paraffin wax is contained as a release agent The refrigerant compressor according to claim 1, wherein the compressor is not provided. 6. The PPS (polyphenylene sulfide) is a linear type glass fiber-containing material, and the oligomer content is 1.0 wt% or less. The PBT (polybutylene terephthalate) is a glass fiber-containing material. And oligomer content is 1.5wt
% Or less. 7. The motor section, wherein a non-magnetized permanent magnet is buried in the rotor, and a current is passed through each winding of the stator to magnetize the permanent magnet of the rotor. 6 slots and 4 poles of the rotor
The refrigerant compressor according to claim 1, wherein the refrigerant compressor is set to a pole. 8. The refrigerant may be HCFC, HFC, HC
2. A refrigerating machine oil comprising a combination of a mineral oil, an alkylbenzene-based oil, an ester-based oil, and a polyvinyl ether-based oil.
A refrigerant compressor as described in the above.