JP2006170005A - Hermetic compressor and refrigeration cycle apparatus using the same - Google Patents

Abstract

A compact and inexpensive hermetic compressor that can reduce the amount of oil discharged, has a small number of parts, and is provided.
The hermetic compressor includes a compression mechanism part 3 in an upper part of a hermetic case 2, a motor part 4 below the compression mechanism part 3, and a sub-bearing 6 that pivotally supports a rotating shaft 5. And an outer rotor type electric motor comprising a stator 4a and a rotor 4b provided with a predetermined gap from the outer peripheral surface of the stator 4a. The stator 4a is fixed to the auxiliary bearing 6 side, and the rotor 4b is fixed to the stator 4a. It fixes to the rotating shaft 5 in the upper part.
[Selection] Figure 1

Description

  The present invention relates to a hermetic compressor and a refrigeration cycle apparatus using the same, and more particularly to a hermetic compressor with an improved rotor structure of an outer rotor type electric motor used as an electric motor section and a refrigeration cycle apparatus using the same.

  In the conventional hermetic compressor, the stator is fixed to the upper frame side, and the open end of the rotor housing is open to the upper side (for example, Patent Document 1).

  For this reason, the oil that is supplied to the sliding portion of the upper compression mechanism and falls to the lower portion enters the rotor housing and becomes an oil reservoir, which becomes the resistance of the stator and the rotor, and the input increases or the oil reservoir is biased. The vibration caused by the unbalancing caused by.

Further, there is a problem that oil is scattered by the open end, the amount of oil discharged increases, the oil level of the oil reservoir at the lower part of the sealed case is lowered, and reliability is lowered. In addition, since the balancer formed on the crankshaft is interposed, the stator is fixed via the subframe, which increases the number of parts and extends in the axial direction. There was a problem of increased shape and cost.
JP 2004-301038 A

  The present invention has been made in view of the above-described circumstances, and can provide a small and inexpensive hermetic compressor and a refrigeration cycle apparatus using the same, which can reduce the amount of oil discharged, and have a small number of parts. The purpose is to do.

  In order to achieve the above-described object, a hermetic compressor according to the present invention includes a compression mechanism section in an upper portion of a hermetically sealed case, a motor section below the compression mechanism section, and the compression mechanism section and the motor below the motor section. In the hermetic compressor provided with a sub-bearing that supports the rotating shaft that connects the parts, the electric motor part is an outer rotor including a stator and a rotor provided with a predetermined gap from the outer peripheral surface of the stator. In the electric motor, the stator is fixed to the sub-bearing side, and the rotor is fixed to a rotating shaft at an upper portion of the stator.

  A refrigeration cycle apparatus according to the present invention includes the hermetic compressor according to claim 1, a condenser, an expansion device, and an evaporator.

  According to the hermetic compressor according to the present invention, it is possible to reduce the amount of oil discharged, and to provide a small and inexpensive hermetic compressor and a refrigeration cycle apparatus using the same with a small number of parts. it can.

  Further, according to the refrigeration cycle apparatus according to the present invention, for example, when used in an air conditioner, an outdoor unit with low power consumption and small vibration can be realized, and the height of the outdoor unit can be reduced to a small size. Furthermore, an inexpensive air conditioner can be provided.

  Hereinafter, an embodiment of a hermetic compressor according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention.

  As shown in FIG. 1, a hermetic compressor 1 according to the present embodiment compresses a refrigerant gas housed above the hermetic case 2 provided with a refrigerant gas suction pipe 2 a and a discharge pipe 2 b. The compression mechanism unit 3 is provided below the compression mechanism unit 3, and the motor unit 4 that rotationally drives the compression mechanism unit 3 is provided below the motor unit 4. The compression mechanism unit 3 and the motor unit 4 are connected to each other. A sub-bearing 6 that supports one side of the rotating shaft 5 and a main bearing 8 that is provided on a main frame 7 that supports the other side of the rotating shaft 5 and is disposed between the compression mechanism portion 3 and the motor portion 4 are provided. Yes.

The compression mechanism unit 3 has, for example, a scroll type compression mechanism, and meshes the spiral wing 3a ₁ of the fixed scroll 3a with the spiral wing 3b _{1 of} the orbiting scroll 3b that rotates eccentrically in the fixed scroll 3a. Thus, the compression space 3s is formed, and the gas refrigerant sucked from the suction port 3c is compressed and discharged from the discharge port 3d. The compression mechanism unit 3 is fixed to the sealed case 2 by press-fitting the fixed scroll 3 a into the sealed case 2. The fixed scroll 3a is in close contact with the main frame 7 in a fixed state, and the orbiting scroll 3b is in close contact with the main frame 7 in a rotatable state.

  The electric motor unit 4 includes an outer rotor type electric motor, and includes a stator 4a and a rotor 4b provided with a predetermined gap from the outer peripheral surface of the stator 4a.

The stator 4 a includes a winding 4 a ₂ wound around a stator core 4 a ₁ , and the stator 4 a is fixed to the sealed case 2 via a secondary bearing 6 fixed to the sealed case 2. The stator 4a is attached to the auxiliary bearing 6 by screwing the stator 4a to a flat surface formed on the auxiliary bearing 6. Thereby, the sub bearing 6 can be easily fixed to the stator.

The rotor 4b is plural rows inserted in the groove provided on the inner peripheral surface of the rotor core 4b ₁ of the ring-shaped, provided with a fixed rotor magnet 4b _2, substantially bowl shape provided so as to cover the outer peripheral surface of the rotor core 4b ₁ through the rotor housing 4b _3, and is fixed to the rotating shaft 5 above the stator 4a. Thereby, the rotor housing 4b ₃ supporting the outer periphery of the rotor core 4b ₁ has a structure in which the open end 4b ₄ is directed downward and the closed end side 4b ₆ connected to the rotary shaft 5 via the boss portion 4b ₅ is directed upward. It becomes possible.

  The rotating shaft 5 is a crankshaft having an eccentric portion 5a and a balance weight portion 5b. As described above, one side is pivotally supported by the auxiliary bearing 6, the other side is pivotally supported by the main bearing 8, and further, An oil supply passage 5c is provided so as to pass through the shaft 5 in an eccentrically inclined state, and the oil sucked up from the lower end oil supply opening 5c1 is supplied to the main bearing 8 and the compression mechanism portion 3 through the upper oil supply opening provided near the upper end and the upper end. Then, it drops through the oil supply return path 7 a provided in the main frame 7 and returns to the bottom of the sealed case 2.

  The hermetic compressor according to the present embodiment having the above-described structure operates the compression mechanism unit 3 by energizing the motor unit 4 and the refrigerant gas sucked into the compression mechanism unit 3 through the suction pipe 2a. It compresses and discharges to the airtight case 2 via the discharge pipe 2b.

  In this compression process, the oil sucked into the oil supply passage 5c from the lower end oil supply opening 5c1 with the rotation of the rotary shaft 5 lubricates and cools the sliding portion of the main bearing 8 and the compression mechanism portion 3, and then the oil supply return passage 7a. And then return to the bottom of the sealed case 2.

In the falling oil, the rotor housing 4b ₃ functions as a baffle plate, the oil can be centrifuged to the outer periphery and returned to the bottom of the case, and the amount of oil discharged can be reduced.

  This reduction in the amount of oil discharged is different from the conventional case in which the opening end of the rotor housing is opened upward, so that oil does not collect at the bottom of the rotor housing, and it accumulates between the stator and the rotor. Therefore, the resistance does not increase and the input does not increase, and further, the vibration due to the occurrence of unbalancing due to the bias of the oil sump does not increase.

  Further, unlike the conventional main frame having a high height for providing a bearing or a sub frame for attaching a stator to the main frame provided below the main frame, this embodiment has a reduced number of parts. Increase in cost due to increase, and it becomes small without extending in the axial direction.

  According to the compressor of this embodiment, it is possible to reduce the amount of discharged oil, and it is possible to realize a small and inexpensive hermetic compressor with a small number of parts.

  Next, the refrigeration cycle apparatus provided with the hermetic compressor according to the present invention will be described.

  As shown in FIG. 1, a refrigeration cycle apparatus 11 according to the present invention includes a hermetic compressor 1 having the above-described structure, and a condensing unit that is connected to the hermetic compressor 1 via a discharge pipe 2b to condense refrigerant. And an evaporator 14 that evaporates the refrigerant and is connected to the hermetic compressor 1 via a suction pipe 2a.

  Accordingly, when the refrigeration cycle apparatus according to the present invention is used in, for example, an air conditioner, an outdoor unit with low power consumption and small vibration can be realized, the height of the outdoor unit can be reduced to a small size, and the cost can be reduced. By using a simple compressor, the refrigeration cycle apparatus is also inexpensive.

  In the above embodiment of the compressor, the example in which the scroll mechanism is used for the compression mechanism unit 3 has been described. However, the compressor according to the present invention may be of a rotor type or a reciprocating type, and the stator of the motor unit. May be one in which windings are concentrated on the magnetic pole teeth of the stator core via an insulating member. Further, if the stator is on the auxiliary bearing side (below the motor part), the stator may be fixed to a fixing member formed separately from the auxiliary bearing.

The conceptual diagram of the compressor and refrigeration cycle apparatus which concern on this invention.

Explanation of symbols

1 ... hermetic compressor, 2 ... sealed case, 3 ... compression mechanism, 4 ... motor part, 4a ... stator, 4b ... rotor, 4b 3 _... rotor housing, 4b 4 _... opening end, 5 ... rotary shaft, 5a ... eccentric portions, 5c ... oil supply passage, 5c 1 _... lower oil fill opening, 6 ... auxiliary bearing, 7 ... mainframe, 8 ... main bearing.

Claims (2)

Hermetic compression provided with a compression mechanism part in the upper part of the sealed case, an electric motor part below the compression mechanism part, and a sub-bearing that pivotally supports a rotating shaft connecting the compression mechanism part and the electric motor part below the motor part. In the machine, the electric motor part is an outer rotor type electric motor including a stator and a rotor provided so as to have a predetermined gap from an outer peripheral surface of the stator, and the stator is fixed to the auxiliary bearing side, and A hermetic compressor, wherein a rotor is fixed to a rotating shaft at an upper portion of the stator. A refrigeration cycle apparatus comprising the hermetic compressor according to claim 1, a condenser, an expansion device, and an evaporator.

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