JP2010223155A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable hermetic compressor capable of reducing an oil delivery quantity to a compressor external part, and capable of securing an oil quantity inside a sealed vessel, with a relatively easy constitution, for solving such the conventional problem, though cost is increased, since there is the necessity of separately arranging a separation board or a rib for the oil separation action, in a conventional technology. <P>SOLUTION: A shape of a valve cover is formed in a tapered shape making the upper side smaller than the lower side, and the direction of a refrigerant gas discharge hole is set in the direction for colliding a refrigerant with the coil end of an electric motor stator, so that refrigerant gas discharged from a compression mechanism can be struck to the compression mechanism side coil end, and lubricating oil splashing on an inside space is urged to drip on the compression mechanism side coil end through surface tension, and the oil separation effect is enhanced, and the oil delivery quantity can be reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reduction in oil discharge amount of a hermetic compressor used in refrigeration equipment such as an air conditioner and a refrigerator.

  For conventional hermetic compressors, a number of techniques relating to reducing the oil discharge amount to the outside of the compressor and securing the oil amount inside the hermetic container have been disclosed.

  Among these, for example, as shown in FIG. 4, a compression mechanism unit 106 and an electric motor unit 102 are installed inside the sealed container 101, and between the rotor 103 of the electric motor unit 102 and the compression mechanism unit 106, A separation plate 108 that rotates integrally with the crankshaft 107 is provided. As a result, the lubricating oil scattered in the inner space 109 between the electric motor unit 102, the compression mechanism unit 106, and the compression mechanism unit side coil end 105 of the stator 104 is separated by the separation plate 108 by the coil end 105 on the compression mechanism unit side. It is made to collide with the inner periphery of the gas and separate from the refrigerant gas (see, for example, Patent Document 1).

  As another technique, as shown in FIG. 5, an inner space 109 between the motor unit 102, the compression mechanism unit 106, and the compression mechanism unit side coil end 105 of the stator 104 is formed by a rib 110. Separated from other internal spaces. Thereby, the blow-up of the lubricating oil scattered in the inner space 109 by the refrigerant gas is suppressed, and the oil discharge amount is reduced (see, for example, Patent Document 2).

With these technologies, the amount of oil discharged to the outside of the compressor is reduced and the amount of oil inside the sealed container is secured, thereby improving the reliability of the compressor itself and increasing the coefficient of performance of the entire refrigeration cycle. .
JP 9-264282 A JP-A-3-124991

  However, in the conventional technique, it is necessary to separately provide the separating plate 108 or the rib 110 for the oil separating action, which increases the cost.

  The present invention solves such a conventional problem, and with a relatively easy configuration, it is possible to reduce the oil discharge amount to the outside of the compressor and to ensure the oil amount inside the sealed container. An object is to provide a high hermetic compressor.

  In order to solve the conventional problem, the present invention has a valve cover with a tapered shape in which the upper side is smaller than the lower side, and the direction of the refrigerant gas discharge hole is the direction in which the refrigerant collides with the coil end of the motor stator. This is a hermetic compressor characterized by that.

  As a result, the refrigerant gas discharged from the compression mechanism section can be applied to the compression mechanism section side coil end, so that the lubricating oil scattered in the inner space promotes dripping of the compression mechanism section side coil end due to surface tension. Thus, the oil separation effect can be enhanced and the oil discharge amount can be reduced.

  The hermetic compressor of the present invention provides a highly reliable hermetic compressor that can reduce the amount of oil discharged to the outside of the compressor and ensure the amount of oil inside the hermetic container with a relatively easy configuration. be able to.

  In the first aspect of the invention, an electric motor, a compression mechanism driven by the electric motor, and a discharge valve on the upper bearing side to discharge refrigerant gas, or a discharge valve and a cover on the lower bearing side are provided in the sealed container. In the vertical hermetic compressor having a structure for discharging the refrigerant gas through the communication hole in the cylinder and having a valve cover for covering only the flange plane of the upper bearing and introducing the refrigerant gas, the shape of the valve cover is The refrigerant gas discharged from the compression mechanism is compressed by a taper shape with the upper side smaller than the lower side, and the direction of the refrigerant gas discharge hole is the direction in which the refrigerant collides with the coil end of the motor stator. Since it can be applied to the coil end on the part side, dripping of lubricating oil to the coil end on the compression mechanism part side by the surface tension is promoted, and the oil separation effect is enhanced and the oil discharge amount is reduced. It can be.

  According to a second invention, in the first invention, the refrigerant gas discharge hole of the valve cover is composed of a plurality of holes, and the flow rate of the refrigerant gas can be changed by the cross-sectional area of the hole. Since it can be applied to the compression mechanism part side coil end, dripping of lubricating oil to the compression mechanism part side coil end due to surface tension is promoted, the oil separation effect can be enhanced, and the oil discharge amount can be reduced.

  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 vertical cross-sectional view of a vertical hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional perspective view of a compression mechanism section and a stator according to Embodiment 1 of the present invention.

  In FIG. 1, an electric motor unit 2 is installed above the inside of the sealed container 1, and a compression mechanism unit 9 is installed below. The electric motor unit 2 includes a stator 3 having an anti-compression mechanism unit side coil end 4 and a compression mechanism unit side coil end 5, and a rotor 6. A crankshaft 8 is press-fitted and fixed to the rotor 6, and the rotational driving force of the electric motor unit 2 is transmitted to the compression mechanism unit 9. The compression mechanism 9 includes a cylinder 11 having a cylindrical air chamber, a piston 13 rotatably fitted to the eccentric shaft portion of the crankshaft 8, and a vane (not shown) that partitions the air chamber of the cylinder 11. And an upper bearing 10 and a lower bearing 12 installed at both ends of the cylinder 11 in the axial direction.

  With the above configuration, the low-pressure refrigerant gas sucked from the suction hole (not shown) of the compression mechanism section 9 is compressed in the cylinder 11 to become high-pressure refrigerant gas, and is once installed on the upper bearing 10. 17 is discharged. Since the refrigerant gas discharge hole 18 of the valve cover 17 is opposed to the compression mechanism unit side coil end 5, an inner space 19 between the electric motor unit 2, the compression mechanism unit 9, and the compression mechanism unit side coil end 5. Discharged. Thereafter, the refrigerant gas mainly passes through the notch 7 of the stator 3 and is discharged from the discharge pipe 21 to the outside of the compressor.

  On the other hand, a lubricating oil reservoir chamber 14 is provided at the bottom of the sealed container 1, and the lubricating oil stored therein passes through an oil hole 15 provided in the crankshaft 8 as the crankshaft 8 rotates. Then, after each sliding portion of the compression mechanism portion 9 is lubricated, it is discharged from the lubricating oil discharge hole 16 between the upper bearing 10 and the crankshaft 8, and then passes through the communication hole 20 provided on the outer periphery of the compression mechanism portion 9. Then, it returns to the lubricating oil reservoir 14 again.

  The valve cover 17 has a tapered shape in which the upper side is smaller than the lower side, and the direction of the refrigerant gas discharge hole 18 is the direction in which the refrigerant collides with the coil end 5 on the compression mechanism portion side of the stator 3.

  With the above configuration, the refrigerant gas discharged from the compression mechanism unit 9 can be applied to the compression mechanism unit side coil end 5, so that the lubricating oil scattered in the inner space 19 is compressed into the compression mechanism unit side coil end 5. It is possible to obtain an oil separation effect by being promoted to drop by surface tension. The dropped lubricating oil falls from the lower end of the compression mechanism unit side coil end 5 due to gravity, passes through the communication hole 20 provided on the outer periphery of the compression mechanism unit 9, and again becomes the lubricating oil reservoir 14 at the bottom of the sealed container 1. Return to. Therefore, the amount of oil discharged to the outside of the compressor can be reduced, and a sufficient amount of oil can be secured inside the sealed container 1.

(Embodiment 2)
FIG. 3 is a cross-sectional perspective view of the compression mechanism section and the stator according to Embodiment 2 of the present invention.

  In the example shown in FIG. 3, the same components as those shown in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 3, a plurality of refrigerant gas discharge holes 18 of the valve cover 17 of the compression mechanism 9 are provided. The flow rate of the refrigerant gas can be changed by the cross-sectional area of the refrigerant gas discharge hole 18 and can be applied to the compression mechanism unit side coil end 5 by the optimum flow rate, so that lubricating oil can be applied to the compression mechanism unit side coil end. The dripping due to the surface tension is promoted to 5 and the oil separation effect can be enhanced and the oil discharge amount can be reduced.

(Embodiment 3)
In recent years, a compressor using an HFC refrigerant not containing chlorine has been developed from the viewpoint of protecting the ozone layer. It is also possible to use a compressor having this mechanism for such an HFC refrigerant.

(Embodiment 4)
In addition, a compressor using a natural refrigerant such as carbon dioxide has been developed from the viewpoint of preventing global warming. The present invention can also be applied to a compressor using such a natural refrigerant.

(Embodiment 5)
Normally, various types of oil are used in the compressor depending on the refrigerant used and the material used for the compression mechanism section 4. The present invention relates to natural products or oils derived from natural products such as naphthenic oil, paraffin oil and alkylbenzene oil, which are mainly used in compressors, and synthetic oils such as polyether oils and polyol ester oils, or the above natural oils. It is also possible to apply to mixed oils of oils derived from products or natural products and synthetic oils.

  As described above, the vertical hermetic compressor according to the present invention can reduce the oil discharge amount to the outside of the compressor and secure the oil amount inside the hermetic container with a relatively easy configuration. It can be applied not only to a harmony machine but also to a dehumidifier.

1 is a longitudinal sectional view of a vertically placed hermetic compressor according to Embodiment 1 of the present invention. Sectional perspective view of compression mechanism and stator in Embodiment 1 of the present invention Sectional perspective view of compression mechanism and stator in embodiment 2 of the present invention Longitudinal sectional view of a vertical hermetic compressor showing a first conventional example Vertical sectional view of a vertical hermetic compressor showing a second conventional example

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 3 Stator 4 Anti-compression mechanism part side coil end 5 Compression mechanism part side coil end 6 Rotor 7 Notch 8 Crankshaft 9 Compression mechanism part 10 Upper bearing 11 Cylinder 12 Lower bearing 13 Piston 14 Lubricant oil reservoir Chamber 15 Oil hole 16 Lubricating oil discharge hole 17 Valve cover 18 Refrigerant gas discharge hole 19 Internal space 20 Communication hole 21 Discharge pipe

Claims (5)

An electric motor in a sealed container, a compression mechanism driven by the electric motor, and a discharge valve on the upper bearing side to release refrigerant gas, or a discharge valve and cover on the lower bearing side to provide a communication hole in the cylinder In the vertical hermetic compressor having a structure that discharges the refrigerant gas and having a valve cover that covers only the flange plane of the upper bearing and introduces the refrigerant gas, the shape of the valve cover is lower than that of the lower side. A hermetic compressor having a tapered shape with a small upper side, and a direction of the refrigerant gas discharge hole being a direction in which the refrigerant gas collides with a coil end of the motor stator. 2. The hermetic compressor according to claim 1, wherein the refrigerant gas discharge hole of the valve cover includes a plurality of holes. 3. The hermetic compressor according to claim 1, wherein HCFC, HFC or the like not containing chlorine is used as a refrigerant. 3. The hermetic compressor according to claim 2, wherein a natural refrigerant such as carbon dioxide, ammonia or helium is used as a refrigerant. Natural products such as naphthenic oil, paraffin oil, and alkylbenzene oil, or oils derived from natural products, and synthetic oils such as polyether oils and polyol ester oils, or mixed oils of the above natural products or natural product-derived oils and synthetic oils The hermetic compressor according to claim 1 or 2, wherein