JP2005264749A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor of high reliability positively fixing and insulating a connection part from the circumference using a cover formed in tube shape by winding an inexpensive insulating plastic sheet a plurality of times. <P>SOLUTION: This electric compressor 10 has an electric element 14 and a compression element 18 enclosed in a sealed container 12, and connects lead wires 1 connected to a terminal 20 mounted to the sealed container 12 and connected to an external power source, to motor leader lines 2 connected to a stator coil 28 of the electric element 14, through connection parts 3 to supply electricity to the electric element 14. The connection part 3 is wrapped in the cover 4 formed in tube shape by winding the insulating plastic sheet the plurality of times and welded at a predetermined part at one end. The lead wire 1 is inserted on the opposite side to the welded side of the cover 4, and the motor leader line 2 is inserted in close contact and fixed to the welded side of the cover 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric compressor, and more particularly to an electric compressor that supplies power to an electric element through a terminal connected to an external power source.

Conventionally, the connecting portion of the electric compressor that supplies power to the electric element by connecting the lead wire connected to the terminal connected to the external power source and the motor lead wire connected to the stator coil of the electric element via the connecting portion. It has been proposed to surround with an insulating cover (see Patent Document 1).
JP 2000-297758 A

However, in order to prevent the insulating cover surrounding the connecting portion from coming off, a saw blade-like stopper is formed on one side of the insulating cover. Had.
The object of the present invention is to solve various problems of the prior art, and can be securely fixed using a cover formed of a tubular shape by winding an inexpensive insulating plastic sheet a plurality of times, and the connection portion is reliably insulated from the periphery. It is to provide a highly reliable electric compressor.

An electric compressor according to claim 1 of the present invention for solving the above-mentioned problems is a lead that houses an electric element and a compression element in a sealed container and is connected to a terminal connected to an external power source attached to the sealed container. In the electric compressor for supplying power to the electric element by connecting a wire and a motor lead wire connected to the stator coil of the electric element via a connecting portion,
The periphery of the connection part is formed in a tube shape by winding an insulating plastic sheet a plurality of times, and is wrapped with a cover welded with a predetermined part at one end, and the lead wire is inserted on the opposite side of the welded side of the cover The motor lead wire is closely inserted and fixed to the welded side of the cover.

  According to a first aspect of the present invention, there is provided an electric compressor that houses an electric element and a compression element in a hermetic container and is connected to a terminal connected to an external power source attached to the hermetic container; In the electric compressor for connecting the motor lead wire connected to the stator coil via the connecting portion and feeding the electric element, the periphery of the connecting portion is formed in a tube shape by winding the insulating plastic sheet a plurality of times, A predetermined portion at one end is wrapped with a welded cover, the lead wire is inserted on the opposite side of the cover to the welded side, and the motor lead wire is inserted in close contact with the welded side of the cover It is characterized in that it is fixed and is formed into a tube shape by winding an inexpensive insulating plastic sheet a plurality of times on the welded side of the cover where a predetermined part of one end is welded Since serial motor lead wire is fixedly inserted in close contact, exhibits pale with indeed can be fixed, the connection portions can be insulated from the surrounding and reliable, the remarkable effect that.

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 the electric compressor of the present invention.
In FIG. 1, reference numeral 10 denotes an internal intermediate pressure multistage compression rotary electric compressor using carbon dioxide (CO ₂ ) as a refrigerant. The electric compressor 10 includes a cylindrical sealed container 12 made of an aluminum-based metal, The electric element 14 arranged and housed above the internal space of the sealed container 12 and 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 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 at the center of the upper surface of the end cap 12B, and a terminal 20 for supplying power to the electric element 14 is fixedly mounted in the mounting hole 12D.

The electric element 14 is a so-called magnetic pole concentrated winding type DC motor, and is inserted into the stator 22 in an annular shape along the inner peripheral surface of the upper space of the hermetic container 12, and is inserted inside the stator 22 with a slight gap therebetween. The rotor 24 is installed. The rotor 24 is fixed to a rotating shaft 18 that passes through the center and extends in the vertical direction.
The stator 22 includes 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. Similarly to the stator 22, the rotor 24 is formed of a laminated body 30 of electromagnetic steel plates, and is formed by inserting a permanent magnet MG into the laminated body 30.

The terminal 20 is connected to an external power source (not shown), and the lead wire 1 connected to the terminal 20 and the motor lead wire 2 connected to the stator coil 28 of the electric element 14 are connected via the connection portion 3. Electric power is supplied to the stator coil 28 from an external power source (not shown) via the terminal 20 → the lead wire 1 → the connection portion 3 → the motor lead wire 2.
As will be described later, the connection portion 3 is wrapped with a cover 4 formed around an insulating plastic sheet.

  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 slope 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 rotary shaft 16 with a phase difference of 180 degrees, and the upper and lower 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. The upper support member 54 and the lower support member 56 are also used as the 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.

  For example, mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, or PAG (polyalkyl glycol) is used as the lubricating oil.

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. 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 is energized from an external power source (not shown) through the terminal 20 → the lead wire 1 → the connection portion 3 → the motor lead wire 2, 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. As a result, the inside of the sealed container 12 becomes an intermediate pressure.

  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. Then, the second stage of compression is performed by the operation of the vane 50 to form 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, It is discharged to the outside and used in circulation.

2 (1) to 2 (6) show an embodiment of a process for creating a cover for wrapping the connecting portion between the lead wire and the motor lead wire of the electric compressor of the present invention shown in FIG. 1, and wrapping the connecting portion. It is explanatory drawing explaining these.
In FIG. 2 (1), it is resistant to refrigerants and lubricating oils such as polyester, polyamide, polyolefin, polycarbonate, engineering plastics, thermoplastic elastomers, thermosetting plastics and the like having a thickness of about 50 μm, and is excellent in heat resistance and strength. An insulating plastic sheet 70 having characteristics is prepared. It is preferable from the viewpoint of strength, stability, fixability, and the like that the thickness is about 150 μm when the thickness is wound a plurality of times such as 2 to 4 times to form a tube. In a single turn, the tube formed is unstable, the strength is low, and the tube cannot be positioned and closely adhered.

  Then, as shown in FIG. 2 (2), the insulating plastic sheet 70 is wound a plurality of times to form a tube 71 (for example, a length of about 50 mm and an inner diameter of about 5 mm).

Then, as shown in FIG. 2 (3), a predetermined portion at one end of the tube 71 is welded using a known method and apparatus. Reference numeral 72 denotes a welded portion, and 73 denotes an unwelded portion. The shape and dimensions of the welded portion 72 may be such that the lead wire 1 can be inserted on the opposite side of the welded side of the tube 71, and the motor lead wire 2 can be inserted into the unwelded portion 73 of the tube 71 and fixed. There is no particular limitation.
Since the motor lead wire 2 is inserted into and closely fixed to the unwelded portion 73, the inner diameter D1 of the unwelded portion 73 and the outer diameter D2 (for example, about 0.5 to 1.2 mm) of the motor lead wire 2 are obtained. It is important that welding is performed so that the inner diameter D1 of the unwelded portion 73 is substantially the same or slightly larger than the outer diameter D2 of the motor lead wire 2.
That is, D1 ≧ D2 is satisfied, but if the inner diameter D1 of the unwelded portion 73 is too large than the outer diameter D2 of the motor lead-out wire 2, the position becomes unsteady and the position is not fixed, and it is positioned and closely adhered. Can not be fixed.

  Then, as shown in FIG. 2 (4), the motor lead wire 2 is inserted from one end of the tube 71 and pulled out a little from the other end of the tube 71. Reference numeral 74 denotes an end for connecting to the lead wire 1.

  Next, as shown in FIG. 2 (5), the lead wire 1 and the motor lead wire 2 are connected and soldered. Reference numeral 75 denotes a solder weld.

  Then, as shown in FIG. 2 (6), after solder welding, the tube 71 can be moved to a predetermined position, fixed at that position, and the connecting portion 3 can be wrapped with the cover 4.

  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 type of the electric compressor. Specifically, the reciprocating electric compressor, the vibration electric compressor, and the multi-vane type are used. A rotary electric compressor, a scroll type electric compressor, or the like may be used, and the number of compression stages may be at least one stage of compression.

  The electric 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, and a water heater. It can be used usefully.

  The electric compressor of the present invention houses an electric element and a compression element in a sealed container, and connects to a lead wire connected to a terminal connected to an external power source attached to the sealed container, and to a stator coil of the electric element. In an electric compressor that connects a motor lead wire through a connecting portion and supplies power to the electric element, the periphery of the connecting portion is formed in a tube shape by winding an insulating plastic sheet a plurality of times, and a predetermined portion at one end is formed Wrapped in a welded cover, the lead wire is inserted on the opposite side of the cover to the welded side, and the motor lead wire is closely inserted and fixed on the welded side of the cover An inexpensive insulating plastic sheet is wound a plurality of times to form a tube shape, and the motor drawer is formed on the welded side of a cover where a predetermined portion at one end is welded. Because There is fixedly inserted in close contact reliably with can be fixed, it can insulate the connecting portion from the peripheral, high reliability, since a marked effect that a higher industrial value.

It is a section explanatory view explaining one embodiment of the electric compressor of the present invention. (1) to (6) describe an embodiment of a process for creating a cover for wrapping the connection portion between the lead wire and the motor lead wire of the Endo compressor of the present invention shown in FIG. 1 and wrapping the connection portion. It is explanatory drawing to do.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead wire 2 Motor lead wire 3 Connection part 4 Cover 10 Rotary compressor 12 Sealed container 12A Container main body 12B End cap 12D Mounting hole 14 Electric element 18 Rotation compression mechanism part 20 Terminal 28 Stator coil 70 Insulating plastic sheet

Claims (1)

An electric element and a compression element are housed in a sealed container, and a lead wire connected to a terminal connected to an external power source attached to the sealed container and a motor lead wire connected to a stator coil of the electric element are connected to each other. In an electric compressor that is connected via a power supply to the electric element,
The periphery of the connection part is formed in a tube shape by winding an insulating plastic sheet a plurality of times, and is wrapped with a cover welded with a predetermined part at one end, and the lead wire is inserted on the opposite side of the welded side of the cover The electric compressor is characterized in that the motor lead wire is closely inserted and fixed to the welded side of the cover.

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