JP2005214160A - Compressor with built-in electromotive element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor with a built-in electromotive element having high motor efficiency and reliability, wherein the stator of the electromotive element is shrink fitted, stably and tightly mounted and stored into a sealed container formed of an aluminum material. <P>SOLUTION: The compressor 10 comprises the cylindrical sealed container 12 formed of the aluminum material, in which the stator 22 of the electromotive element 14 is stored at a predetermined position. The stored stator 22 is shrink fitted thereto to the extent of satisfying an expression: 0<δ≤3×D, where D(mm) is the inner diameter of the sealed container 12 and δ(μm) is an interference. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor incorporating an electric element, and more particularly, to a compressor incorporating an electric element including a container made of an aluminum material using carbon dioxide among natural refrigerants. is there.

Conventionally, chlorofluorocarbon (R11, R12, R134a, etc.) is generally used as a refrigerant in the refrigeration cycle. However, when CFCs are released into the atmosphere, they have problems such as a large warming effect and ozone layer destruction. For this reason, in recent years, other natural refrigerants having little influence on the environment, such as oxygen (O ₂ ), carbon dioxide (CO ₂ ), hydrocarbon (HC), ammonia (NH ₃ ), and water (H ₂ O), are used. Research on use as a refrigerant has been conducted. Among these natural refrigerants, oxygen and water are low in pressure and difficult to use as refrigerants in the refrigeration cycle, and ammonia and hydrocarbons are flammable, and therefore have a problem that they are difficult to handle. For this reason, a compressor using carbon dioxide has been proposed (see Patent Document 1).

  Conventionally, this type of compressor has a stator that is tightly fitted tightly in an annular shape by shrink fitting along an inner peripheral surface of a predetermined position in an upper space in a sealed container made of a cylindrical iron-based material, An electric element as a drive element having a rotor inserted and installed at a slight interval inside the stator and a compression element that is driven by this electric element to compress the refrigerant are accommodated to start the electric element Then, the compression element is driven, and the refrigerant introduced into the compression element is compressed and discharged.

In recent years, a sealed container made of an aluminum-based material has been proposed in order to reduce the weight of the compressor (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 10-19401 Japanese Patent Application No. 2003-077983

However, when the sealed container is made of an aluminum-based material, the aluminum-based material has an advantage of being significantly lighter than a steel plate, but conventionally, along the inner peripheral surface of a predetermined position of the upper space in the sealed container. The tightening allowance δ used when shrink-fitting and storing the stator is insufficiently tightened, and the stator cannot be mounted stably and tightly, resulting in a problem that the reliability of the compressor is lowered.
On the other hand, when the stator is shrink-fitted and stowed, if the stator is tightened too much, the laminated body in which the donut-shaped electrical steel sheets of the stator are laminated and the teeth of the laminated body are wound by a direct winding (concentrated winding) method. Excessive force is applied to the mounted stator coil, and the laminated body is deformed or broken, the insulation of the winding of the stator coil is impaired, resulting in poor insulation, There was a problem that the interval could not be maintained and the motor efficiency deteriorated.

  The object of the present invention is to solve various problems of the prior art, so that the stator laminate is not deformed or deformed, the insulation of the winding of the stator coil is not impaired, and the stator and rotor are properly connected. By providing a highly reliable compressor with improved motor efficiency in which the stator is shrink-fitted in an airtight container made of aluminum and stably mounted tightly in a closed state with the interval maintained. is there.

The compressor incorporating the electric element according to claim 1 of the present invention for solving the above problem is a compression in which the stator of the electric element is housed in a predetermined position in a cylindrical sealed container made of an aluminum-based material. In the machine
When the inner diameter of the hermetic container is D (mm) and the tightening margin is δ (μm), the stator is shrink-fitted and accommodated within the range represented by the following formula (1).
0 <δ ≦ 3 × D Formula (1)

  The compressor incorporating the electric element according to claim 2 of the present invention is the compressor according to claim 1, wherein Si is 0.1 to 10% by mass, Mg is 0.8 to 1% by mass and / or aluminum-based material. An Al-Mg, Al-Cu, or Al-Mg-Cu-based aluminum-based material containing 0.4 to 0.8 mass% of Cu is used.

  The compressor incorporating the electric element according to claim 3 of the present invention is characterized in that in the compressor according to claim 1 or 2, the refrigerant is carbon dioxide.

According to a first aspect of the present invention, there is provided a compressor having a built-in electric element, wherein the electric element has a stator accommodated at a predetermined position in a cylindrical hermetic container made of an aluminum material. Is D (mm), and the tightening margin is δ (μm), the stator is shrink-fitted and stored in a range that satisfies the relationship of the formula (1).
The stator is securely attached tightly at a predetermined position in an airtight container made of an aluminum material, and no excessive force is applied to the stator laminate or stator coil during shrink fitting. Will not be deformed or collapsed, the insulation of the windings of the stator coil will not be impaired, the proper spacing between the stator and rotor will be maintained, motor efficiency, high reliability and light weight There is a remarkable effect that can be achieved.

  The compressor incorporating the electric element according to claim 2 of the present invention is the compressor according to claim 1, wherein Si is 0.1 to 10% by mass, Mg is 0.8 to 1% by mass and / or aluminum-based material. Since Al-Mg, Al-Cu, or Al-Mg-Cu-based aluminum-based material containing 0.4 to 0.8% by mass of Cu is used, the strength of the sealed container can be increased and the stator is more stable. It has a remarkable effect that it can be attached tightly.

  In the compressor incorporating the electric element according to claim 3 of the present invention, the refrigerant is carbon dioxide in the compressor according to claim 1 or 2, so that the refrigerant pressure is higher during operation than the conventional chlorofluorocarbon refrigerant. Even if carbon dioxide, which is a natural refrigerant, is expressed, it has a further remarkable effect that it has sufficient strength and stability and reliability is not impaired.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional explanatory view illustrating an embodiment of a compressor of the present invention.
In FIG. 1, reference numeral 10 denotes an internal intermediate pressure multistage compression rotary compressor that uses carbon dioxide (CO ₂ ) as a refrigerant. The compressor 10 includes a cylindrical sealed container 12 made of an aluminum-based material, and a hermetic seal. The electric element 14 arranged and housed above the internal space of the container 12, the lower rotary compression element 32 (first stage) arranged below the electric element 14 and driven by the rotating shaft 16 of the electric element 14, and The rotary compression mechanism unit 18 is composed of an upper rotary compression element 34 (second stage).
The sealed container 12 has an oil reservoir at the bottom, a container body 12A that houses the electric element 14 and the rotary compression mechanism 18, and a generally bowl-shaped end cap (lid body) 12B that closes the upper opening of the container body 12A. It is configured.
A circular mounting hole 12D is formed in the center of the upper surface of the end cap 12B. A terminal (wiring is omitted) 20 for supplying power to the electric element 14 is fixedly mounted in the mounting hole 12D. ing. Then, an internal / external wiring (not shown) communicating with the inside and outside of the sealed container 12 is connected via the terminal 20 to supply power to the electric element 14.

  The electric element 14 is a so-called magnetic pole concentrated winding type DC motor, and is mounted in an annular shape by shrink fitting at a predetermined position along the inner peripheral surface of the upper space of the cylindrical sealed container 12 made of an aluminum-based material. A stator 22 and a rotor 24 inserted and installed inside the stator 22 with a slight gap therebetween. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the vertical direction.

The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Further, the rotor 24 is formed of a laminated body 30 of electromagnetic steel sheets, like the stator 22, and is formed by inserting a permanent magnet MG into the laminated body 30.
This stator 22 has an inner circumference of the upper space of the hermetic container 12 within the range represented by the above formula (1) when the inner diameter of the hermetic container 12 is D (mm) and the interference is δ (μm). It is attached in an annular shape by shrink fitting at a predetermined position along the surface (a specific example of shrink fitting is shown below).

(Concrete example)
D (mm) = 109,
Tightening allowance δ (μm) = 100
Upper limit of interference δ (μm) = 3 × D = 3 × 109 = 327 (μm)
A sealed container 12 made of an aluminum-based material containing 0.1 to 10% by mass of Si, 0.8 to 1% by mass of Mg or 0.4 to 0.8% by mass of Cu is heated to about 200 ° C. After that, the stator 22 was inserted into a predetermined position along the inner peripheral surface of the upper space of the hermetic container 12, and was cooled to room temperature and shrink-fitted while maintaining the state.

  If the tightening allowance δ (μm) is the lower limit value 0 of the above formula (1), the tightening is insufficient, the stator cannot be mounted stably and tightly, and the reliability of the compressor may be lowered. When δ (μm) exceeds the upper limit value 3 × D of the above formula (1), it is overtightened, and an excessive force is applied to the laminated body 26 and the stator coil 28 of the stator 22 so that the laminated body 26 becomes There is a risk that deformation, breakage, insulation of the windings of the stator coil 28 may be impaired and insulation failure may occur, and an appropriate distance between the stator 22 and the rotor 24 may not be maintained.

  The aluminum-based material used in the present invention is not particularly limited, but an aluminum-based material containing 0.1 to 10% by mass of Si, 0.8 to 1% by mass of Mg and / or 0.4 to 0.8% by mass of Cu is preferable. Can be used. If Si is less than the lower limit value of 0.1% by mass or exceeds the upper limit value of 10% by mass, the strength may be insufficient. Similarly, Mg and Cu may have insufficient strength if less than the lower limit value or exceeds the upper limit value. .

  Since the stator 22 is shrink-fitted and stored in this manner, it can be stably and tightly attached to a predetermined position along the inner peripheral surface of the upper space of the sealed container 12. When the shrink fitting is performed, excessive force is not applied to the laminated body 26 and the stator coil 28 of the stator 22, so that the laminated body 26 is not deformed or broken, and the insulation of the winding of the stator coil 28 is impaired. Therefore, an appropriate distance between the stator 22 and the rotor 24 is maintained, so that the motor efficiency can be improved and the reliability is improved.

  An intermediate partition plate 36 is sandwiched between the lower rotary compression element 32 and the upper rotary compression element 34. That is, the lower rotary compression element 32 and the upper rotary compression element 34 include an intermediate partition plate 36, an upper cylinder 38 and a lower cylinder 40 disposed above and below the intermediate partition plate 36, and the upper and lower cylinders 38, 40. The upper and lower rollers 46 and 48 are rotated omnidirectionally by upper and lower omnidirectional portions 42 and 44 provided on the rotating shaft 16 with a phase difference of 180 degrees, and the upper and lower cylinders are in contact with the upper and lower rollers 46 and 48. 38 and 40 are divided into a low pressure chamber side and a high pressure chamber side, respectively, and the upper opening surface of the upper cylinder 38 and the lower opening surface of the lower cylinder 40 are closed to support the bearing of the rotary shaft 16. An upper support member 54 and a lower support member 56 are also used as supporting members.

On the other hand, the upper support member 54 and the lower support member 56 are respectively provided with a suction passage 60 (the upper suction passage is not shown) that communicates with the inside of the upper and lower cylinders 38 and 40 through a suction port (not shown), and a part thereof is recessed. Discharge silencing chambers 62 and 64 formed by closing the recessed portion with an upper cover 66 and a lower cover 68 are provided.
The discharge silencer chamber 64 and the inside of the sealed container 12 are communicated with each other through a communication passage that penetrates the upper and lower cylinders 38 and 40 and the intermediate partition plate 36, and an intermediate discharge pipe 121 is provided upright at the upper end of the communication passage. The intermediate pressure refrigerant gas compressed by the lower rotary compression element 32 is discharged from the intermediate discharge pipe 121 into the sealed container 12.

Carbon dioxide (CO ₂ ) is used as the refrigerant, and the oil as the lubricating oil is, for example, an existing oil such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkyl glycol), or the like. used.

On the side surface of the container main body 12A of the sealed container 12, the suction passage 60 (upper side is not shown) of the upper support member 54 and the lower support member 56, the discharge silencer chamber 62, the upper side of the upper cover 66 (on the lower end of the electric element 14). The sleeves 142 and 143 are fixed by welding at positions corresponding to the substantially corresponding positions.
In addition, one end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted and connected in the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 60 of the lower cylinder 40. Further, one end of a refrigerant discharge pipe 96 is inserted and connected into the sleeve 143, and one end of the refrigerant discharge pipe 96 communicates with the discharge silencer chamber 62.

When the stator coil 28 of the electric element 14 of the compressor 10 is energized via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 rotate eccentrically in the upper and lower cylinders 38 and 40.
Thereby, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56 is transferred between the roller 48 and the vane 52. It is compressed by the operation to become an intermediate pressure, and is discharged from the intermediate discharge pipe 121 into the sealed container 12 through a communication path (not shown) from the high pressure chamber side of the lower cylinder 40. Thereby, the inside of the sealed container 12 becomes an intermediate pressure.
The refrigerant discharged into the sealed container 12 is cooled by removing heat from the sealed container 12.

  The intermediate-pressure refrigerant gas is drawn into a low pressure chamber side of the upper cylinder 38 of the upper rotary compression element 34 from a suction port (not shown) via a suction passage (not shown) formed in the upper support member 54, and the roller 46. The second stage of compression is performed by the operation of the vane 50 to generate high-pressure and high-temperature refrigerant gas, and from the high-pressure chamber side, through a discharge port (not shown), and through a discharge silencer chamber 62 formed in the upper support member 54, a refrigerant discharge pipe 96. More discharged to the outside.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Moreover, each part structure of this invention is not restricted to the said embodiment, For example, the following various deformation | transformation are possible within the technical scope as described in a claim.

  In the above description, the two-stage compression rotary compressor has been described. However, the present invention is not particularly limited in the form of the compressor, and specifically, a reciprocating compressor, a vibration compressor, and a multi-vane rotary compressor. A scroll compressor or the like may be used, and the number of compression stages may be at least one stage of compression.

  The compressor of the present invention includes a home air conditioner, a commercial air conditioner (package air conditioner), an automotive air conditioner, a home refrigerator, a commercial refrigerator, a commercial freezer, a commercial freezer refrigerator, a showcase, a vending machine, a water heater, etc. It can be used for.

  The compressor incorporating the electric element of the present invention is a compressor in which the stator of the electric element is housed at a predetermined position in a cylindrical airtight container made of an aluminum material, and the inner diameter of the airtight container is D (mm). When the fastening margin is δ (μm), the stator is shrink-fitted and accommodated within the range of the relation of the formula (1), so that the stator is at a predetermined position in the sealed container made of an aluminum material. Since the stator stack and stator coil are not excessively applied during shrink fitting, the stack does not deform or break down. The insulation of the wire is not impaired, the appropriate distance between the stator and the rotor is maintained, the motor efficiency is high, the reliability is high, and the weight can be reduced, so the industrial utility value is high.

It is a section explanatory view explaining one embodiment of the compressor of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Airtight container 14 Electric element 18 Rotary compression mechanism part 22 Stator 24 Rotor 28 Stator coil 32 Lower rotary compression element 34 Upper rotary compression element 94 Refrigerant introduction pipe 96 Refrigerant discharge pipe

Claims (3)

In the compressor in which the stator of the electric element is stored in a predetermined position in a cylindrical sealed container made of an aluminum-based material,
An electric element characterized in that the stator is shrink-fitted and accommodated within the range of the following formula (1) where the inner diameter of the sealed container is D (mm) and the interference is δ (μm). Built-in compressor.
0 <δ ≦ 3 × D Formula (1) Al-Mg-based, Al-Cu-based or Al-Mg-Cu containing 0.1 to 10 mass% Si, 0.8 to 1 mass% Mg and / or 0.4 to 0.8 mass% Cu as an aluminum-based material 2. The compressor according to claim 1, wherein an aluminum-based material is used. The compressor according to claim 1 or 2, wherein the refrigerant is carbon dioxide.

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