JP2005299462A - Sealed compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed compressor having high performance and high reliability and capable of preventing blow-up of refrigerating machine oil by exhaust gas even in a type of machine, in which oil level assembled in, especially, a multiple refrigerant system changes large. <P>SOLUTION: Position of a refrigerant discharge hole 7 of a muffler 6 is arranged higher than a lower end of a coil end 3c of a stator 3a of a motor. With this structure, even if the oil 8 level rises a little, since the discharge position is higher in comparison with a current one, large blow-up of the oil level 8 is prevented, and furthermore, even if the oil level 8 rises higher than the discharge hole 7, refrigerant is discharged to a space formed by the oil level 8 and the inner periphery of the coil end 3c, and when oil passes through a clearance between the stator 3 and a rotor 3b and a clearance between the stator 3a and a slot clearance, oil can be separated. An efficient compressor having high reliability is thereby obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hermetic compressor used in an air conditioner or the like.

  In general, it is known that when refrigeration oil is mixed in a refrigeration cycle, the heat resistance of the heat exchanger increases, the pressure loss of the piping increases, and the efficiency of the refrigeration cycle decreases. Moreover, when the discharge amount of refrigerating machine oil increases, there is a problem that the compressor becomes insufficiently lubricated and the reliability of the compressor is impaired. For this reason, various oil separation means are provided in a hermetic compressor used in an air conditioner or the like.

  Hereinafter, an example of the prior art will be described with reference to the drawings (for example, see Patent Document 1).

As shown in FIG. 3, the gas refrigerant compressed by the compression mechanism unit 2 is discharged into the sealed container 1 from the discharge hole 7 provided in the muffler 6, and the gap between the stator 3 a and the rotor 3 b of the electric motor 3, And, it passes through the gap between the stator 3a and the sealed container 1 and is guided to the upper space. Thereafter, in the vicinity of the oil separation plate 13 constituted by a thin plate installed on the rotor 3b, the gas refrigerant and the oil accompanying it are centrifuged, and only the gas refrigerant is discharged from the discharge pipe. On the other hand, after the refrigerating machine oil lubricates the compressor rear portion 2, most of the refrigerating machine oil falls below the upper and lower bearings 11 and 12 and returns to the refrigerating machine oil sump 10.
JP-A-62-147082

  As described above, in the above prior art, the refrigerating machine oil stored in the bottom of the sealed container is foamed during the operation of the compressor, dissolved in the gas discharged from the compressor element in the form of mist, and led to the upper part of the sealed container. Since the oil component is separated near the opening end of the discharge pipe inlet, when the circulation rate of the refrigeration cycle is increased, the force of the discharge gas flow rate is greater than the centrifugal force of rotation of the oil separation plate. Is strong and sufficient oil separation action cannot be expected. Also, in a fluctuating operating environment, if the refrigerant level increases excessively or constantly and the oil level rises, the exhaust hole position installed in the muffler is lower than the oil level, and the exhaust gas The refrigeration oil is blown upward, and as a result, the discharge amount of the refrigeration oil is increased and the efficiency of the refrigeration cycle is reduced.

  Furthermore, when the exhaust hole of the muffler is provided at a low position or in the vicinity of the crankshaft that drives the compression mechanism, when the refrigerating machine oil that lubricates the crankshaft returns from the upper bearing to the refrigerating machine oil sump, it is blown up by the exhaust gas, Increases the discharge amount of refrigeration oil. This tendency is particularly noticeable in inverter models that operate at high speed.

  From the above phenomenon, the efficiency of the refrigeration cycle is reduced, and the level of the refrigeration machine oil reservoir of the compressor is drastically lowered, resulting in insufficient lubrication of the compression mechanism, leading to a decrease in reliability.

  The present invention solves the above-described conventional problems, and has high performance and high reliability without blowing up refrigeration oil by exhaust gas even in a model in which the oil level incorporated in a multi-refrigerant system varies greatly. An object is to provide a compressor.

  In order to solve the above-mentioned problems, the present invention provides a case where the oil level fluctuates by making the exhaust hole of the muffler for discharging the compressed refrigerant from the compression mechanism portion into the sealed container higher than the lower end of the coil end of the motor stator. But it prevents the situation where refrigeration oil is blown up.

  Furthermore, the discharge direction is in the direction of the gap formed between the inner periphery of the coil end and the outer periphery of the rotor end ring, so that the return path of the refrigerating machine oil that has finished crankshaft lubrication is partitioned by the end ring and blown up. Can be prevented.

  The hermetic compressor of the present invention can prevent the refrigerating machine oil from flowing into the cycle, and can provide a high-performance and highly reliable compressor.

  The first invention has a discharge pipe above the airtight container and an electric motor in the upper part inside the airtight container, and a compression mechanism portion driven by the electric motor below, and the compression mechanism portion discharges the compressed refrigerant upward. In a hermetic electric compressor having a discharge hole, a valve for opening and closing the same, and a muffler that covers these and has a discharge hole for discharging compressed refrigerant into the sealed container, the position of the refrigerant discharge hole of the muffler Is disposed above the lower end of the coil end of the motor stator, so that even when the oil level rises, it is not greatly blown up. Furthermore, even when the oil level rises and exceeds the discharge hole, the gap between the stator and the rotor and the slot slot of the stator are small because the oil is discharged into the space formed by the oil level and the inner periphery of the coil end. Oil is separated when passing through the gap.

  According to a second aspect of the present invention, by providing a muffler discharge hole in the gap direction formed by the inner periphery of the coil end of the motor stator and the outer periphery of the rotor end ring, the crankshaft lubrication is finished and the exhaust is discharged from the upper part of the upper bearing. When the refrigerating machine oil returns to the lower refrigerating machine oil sump, the path and the discharge direction are partitioned by an end ring, and the blow-up can be prevented.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a diagram showing a hermetic compressor according to a first embodiment of the present invention.

  The discharge pipe and the upper part of the closed container 1 are provided with an electric motor 3 at the upper part of the closed container 1 and the compression mechanism part 2 driven by the electric motor 3 at the lower part. The compression mechanism part 2 discharges the compressed refrigerant upward. In a hermetic electric compressor having a muffler 6 having a discharge hole 4 for opening and closing, a valve 5 for opening and closing it, and a discharge hole 7 for discharging the compressed refrigerant into the sealed container 1. By disposing the position of the refrigerant discharge hole 7 above the lower end of the coil end 3c of the motor stator 3a, even if the oil level 8 rises somewhat, the discharge position is higher than before, so the oil level 8 There is no big blow. Therefore, a large amount of refrigeration oil discharge to the refrigeration cycle in the initial operation can be prevented. Further, even when the oil level 8 rises to become the discharge hole 7 or more, since it is discharged to the space formed by the oil level 8 and the inner periphery of the coil end 3c, the gap between the stator 3a and the rotor 3b, When passing through a small gap such as a slot gap of the stator 3a, the oil is separated. As a result, the efficiency of the refrigeration cycle can be prevented from decreasing, and the lack of lubrication resulting from the decrease in oil level can be avoided to provide a highly reliable compressor.

(Embodiment 2)
FIG. 2 is a view showing a hermetic compressor according to the second embodiment of the present invention.

A discharge hole 7 for the muffler 6 is provided in a gap direction formed between the inner periphery of the coil end 3c of the motor stator 3a and the outer periphery of the end ring 3b of the rotor 3b. In order to prevent the refrigerating machine oil discharged from the upper part of the upper bearing 11 from returning to the lower refrigerating machine oil pool 10 after the lubrication of the crankshaft 9 is returned, the refrigerating machine oil path is prevented from being blown up by exhaust gas. The discharge direction is formed by partitioning the discharge direction with the end ring 3b. Further, by arranging the discharge holes 7 in the direction of small gaps such as the gap between the stator 3a and the rotor 3b and the slot gap of the stator 3a, an oil separation effect when the refrigerant passes can be expected.

  As described above, the hermetic compressor in the present invention can be applied to all hermetic electric compressors regardless of the size.

The figure which shows the hermetic compressor in the 1st Embodiment of this invention The figure which shows the hermetic compressor in the 2nd Embodiment of this invention The figure which shows the hermetic compressor of the conventional form

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Electric motor 3a Stator 3b Rotor 3c Coil end 3d End ring 4 Discharge hole 5 Valve 6 Muffler 7 Discharge hole 8 Oil surface 9 Crankshaft 10 Refrigerating machine oil reservoir 11 Upper bearing 12 Lower bearing 13 Oil separation Plate 14 Discharge pipe

Claims (2)

A discharge pipe and an electric motor in the upper part inside the closed container are provided above the closed container, and a compression mechanism part driven by the electric motor is provided in the lower part. The compression mechanism part includes a discharge hole for discharging the compressed refrigerant upward, and In a hermetic electric compressor having a valve that opens and closes and a muffler that covers these and has a discharge hole for discharging the compressed refrigerant into the sealed container, the position of the refrigerant discharge hole of the muffler is fixed to the motor. A hermetic compressor, which is disposed above the lower end of a coil end of a child. 2. The hermetic compressor according to claim 1, wherein a discharge hole of a muffler is provided in a gap direction formed by an inner periphery of a coil end of the motor stator and an outer periphery of the rotor end ring.