JP2006037798A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable compressor preventing minute foreign substance existing in a refrigerating cycle including a compressor from being mixed with refrigerant or oil and intruding in a compressor mechanism. <P>SOLUTION: A lower shell 102 constructing a hermetic vessel is formed in a raised bottom shape. The minute foreign substance 101 stays in the deepest part of a bottom of the raised bottom shape lower shell 102. Since an oil supply mechanism 7 can supply oil without pumping up the minute foreign substance by positioning a suction opening of the oil supply mechanism 7 at the highest part of the raised bottom part, the reliable compressor can be provided at low cost. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hermetic compressor for use in refrigeration air conditioning, hot water supply, refrigerator, etc. for business use, home use, or vehicle use.

  Conventionally, as shown in FIG. 2, this type of hermetic compressor includes a compression mechanism 2 in a hermetic container 1, an electric motor 3 for driving the compression mechanism 2 provided below the compression mechanism 2, and the electric motor. 3 and a crankshaft 4 for transmitting the rotational force 3 to the compression mechanism 2, and the oil 6 of the oil sump 20 provided at the lower part in the sealed container 1 is passed through the crankshaft 4 to the bearing portion 66 of the crankshaft 4 and the compression mechanism And an oil supply mechanism 7 that supplies the two sliding portions.

  As a result, the oil 6 is forcibly supplied to the bearing 66 and the sliding portion of the compression mechanism 2 against the gravity by the oil supply mechanism 7, and the refrigerant gas compressed by the compression mechanism 2 is sealed in a sealed container while ensuring smooth operation. After the motor 3 is cooled through the portion of the motor 3 in 1, the oil is discharged to the outside of the hermetic container 1, and the oil after being supplied to the sliding portion of the bearing portion 66 and the compression mechanism 2 is supplied by supply pressure or gravity. It can move downward and be naturally recovered in the oil sump 20.

  Here, fine oil 100 such as iron powder may be mixed in the oil 6 stored in the oil reservoir 20. The oil 6 in which the fine foreign matter 100 is mixed is forcibly supplied to the bearing portion 66 and the sliding portion of the compression mechanism 2 against the gravity by the oil supply mechanism 7 as it is, and the foreign matter 100 also enters the compression mechanism 2.

Conventionally, in order to solve this problem, as in Patent Document 1, in the oil separator disposed in the refrigerant circuit as shown in FIG. 3, a fine foreign matter removal filter is provided between the refrigerant / oil inflow pipe and the oil outflow pipe. A filter is provided. Therefore, foreign matters such as abrasion powder mixed in the separated oil are removed, and fine foreign matters mixed in the refrigerant are also removed by the filter dryer, so that there is a means that re-inflow into the compressor is prevented.
JP-A-5-005580

  However, none of the conventional methods can satisfactorily remove foreign matter. In the conventional example, an oil separator is also required.

  An object of the present invention is to provide a foreign matter removal method that makes it difficult for fine foreign matter to enter the compressor mechanism without increasing the number of parts and improves the reliability of the compressor.

  A hermetic compressor and a foreign matter removing method according to the present invention include a compression mechanism in a hermetic container, an electric motor for driving the compression mechanism provided below the compression mechanism, and compressing the rotational force of the electric motor. A crankshaft for transmitting to the mechanism portion, and an oil supply mechanism for supplying oil in an oil sump provided in the lower part of the sealed container to the crankshaft bearing portion and the compression mechanism sliding portion through the crankshaft. In order to achieve the above object, the gas discharged from the compression mechanism is discharged from the discharge chamber in the container above the compression mechanism, and from the discharge chamber in the container to the compression mechanism. A compression mechanism communication path communicating with the lower part, a communication path extending from the compression mechanism communication path to the rotor upper chamber, a rotor passage provided in the rotor so as to communicate the rotor upper chamber and the rotor lower chamber, and the rotor lower part Room, Stator upper chamber around the outside of the communication path through the stator or the stator passage provided between the stator and the hermetic container so that the lower part and the upper part of the stator are communicated with each other. In the container, there is a gas passage inside the container that allows it to be discharged outside the sealed container through the external discharge port provided in the part above the position of the upper chamber of the sealed container. The lubricating oil is forcedly supplied to the bearing portion and the sliding portion of the compression mechanism 2 against the gravity by the oil supply mechanism, and the refrigerant gas compressed by the compression mechanism 2 is passed through the motor portion in the sealed container while ensuring a smooth operation. After cooling, the oil is discharged to the outside of the sealed container 1 so that the oil after being supplied to the bearing portion and the sliding portion of the compression mechanism moves downward due to supply pressure and gravity and is naturally recovered in the oil reservoir. can do

  Here, fine foreign matters such as iron powder may be mixed in the oil stored in the oil sump. The oil in which the fine foreign matter is mixed is forcibly supplied to the sliding portion of the bearing portion and the compression mechanism against the gravity by the oil supply mechanism as it is, and the fine foreign matter enters the compression mechanism.

  Here, by setting the shape of the lower shell to the raised bottom, fine foreign matter accumulates in the bottommost part of the raised bottom bottom shell, and the suction port of the oil supply mechanism is positioned at the highest part of the raised bottom, The oil supply mechanism is characterized in that it can supply oil without sucking up fine foreign matter.

  Features of the present invention will become apparent from the following detailed description and drawings. The features of the present invention can be used alone or in combination in various combinations as much as possible.

  According to the present invention, the discharge gas from the compression mechanism, the compression mechanism that accompanies the gas, and the oil containing fine foreign matters after being supplied to the bearing portion are separated from the oil by providing a raised bottom on the lower shell. The oil supply mechanism can be separated into foreign matters, and the oil supply mechanism can pump up oil that does not contain fine foreign matters, and can prevent fine foreign matters from entering the compression mechanism.

  Also, by providing a raised bottom on the lower shell, the amount of oil can be reduced and the cost can be reduced without changing the oil level.

  Further, the cost can be reduced by making the raised bottom with an inexpensive resin.

  Further, by creating the raised bottom with a magnet, fine foreign matters made of iron or the like can be adsorbed and the fine foreign matters can be prevented from entering the compressor more reliably.

  Hereinafter, a hermetic compressor according to an embodiment of the present invention and a gas-liquid separation and discharge method thereof will be described with reference to FIG. 1 for understanding of the present invention.

  This embodiment is an example of a case of a hermetic compressor for a refrigeration cycle incorporating a vertical scroll-type compression mechanism, and a compression target is a refrigerant gas. However, the present invention is not limited to this, and various types of compression mechanisms such as a rotary compression mechanism, as well as the gas built in the sealed container together with the electric motor that drives the compression mechanism, are compressed. A hermetic compressor that divides the upper and lower parts and accommodates an electric motor in the lower part is effective when applied to all of them and belongs to the category of the present invention.

(Embodiment 1)
As shown in FIG. 1, the hermetic compressor according to the present embodiment includes a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in the hermetic container 1, and bolts on the main bearing member 11. The scroll type compression mechanism 2 is configured by sandwiching the orbiting scroll 13 meshing with the fixed scroll 12 between the fixed scroll 12 and the rotation of the orbiting scroll 13 between the orbiting scroll 13 and the main bearing member 11. A rotation restricting mechanism 14 such as an Oldham ring that guides the orbit to move in a circular orbit is provided, and the orbiting scroll 13 is moved in an orbit by driving the orbiting scroll 13 eccentrically by the main shaft portion 4a at the upper end of the crankshaft 4. As a result, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 becomes smaller while moving from the outer peripheral side to the center portion. , The refrigerant gas 27 is sucked from the suction pipe 16 communicating with the outside of the sealed container 1 and the suction port 17 in the outer peripheral portion of the fixed scroll 12 and compressed, and the refrigerant gas that exceeds the predetermined pressure is fixed to the fixed scroll. The reed valve 19 is pushed open from the discharge port 18 at the center of 12 and discharged into the sealed container 1 repeatedly.

  The lower end of the crankshaft 4 reaches an oil sump 20 at the lower end of the sealed container 1 and is supported by a secondary bearing 21 fixed by welding or shrink fitting in the sealed container 1 so that it can rotate stably. The electric motor 3 is located between the main bearing member 11 and the auxiliary bearing 21 and is integrally coupled to a stator 3 a fixed to the sealed container 1 by welding or shrink fitting, and an outer periphery in the middle of the crankshaft 4. Balance weights 23 and 24 fixed by pins 22 are provided on the outer peripheral portions of the upper and lower end surfaces of the rotor 3b, so that the rotor 3b and the crankshaft 4 are stabilized. By rotating, the orbiting scroll 13 can be stably moved in a circular orbit.

  The oil supply mechanism 7 is driven by a pump 25 driven at the lower end of the crankshaft 4, and the oil 6 in the oil reservoir 20 is passed through the oil supply hole 26 passing through the crankshaft 4 and the bearing portions 66 and the compression mechanisms of the respective parts of the compression mechanism 2. 2 is supplied to each sliding part. The supplied oil 6 flows out and drops below the main bearing member 11 through the bearing portion 66 so as to obtain a clearance by supply pressure or gravity, and is finally collected in the oil reservoir 20.

  However, in practice, as described above, there is a problem that the fine foreign matter 100 generated in the compressor 2 is pumped up together with the oil 6 from the oil supply mechanism 7 and enters the compressor 2.

  In the embodiment shown in FIG. 1, a raised bottom 100 is provided on the lower shell 102 in order to solve such a problem.

  The discharged gas containing the fine foreign matter 100 passing through the rotor passage 36 reaches the oil level of the auxiliary bearing 21 or the oil reservoir 20 from the rotor passage 36 by the centrifugal force generated by the rotation of the rotor 3b. The fine foreign matter 100 is deposited on the bottom of the oil reservoir 20 by its own weight.

  At this time, by providing the raised bottom 100 on the lower shell 102, the fine foreign matter 100 is deposited on the outer peripheral portion of the lower shell 102 by the raised bottom 100. And the oil supply mechanism 7 is located in the highest part of the raising bottom part, and can pump up the oil 6 in which the fine foreign material 100 does not exist.

  The oil supply mechanism 7 supplies the oil 6 separated from the fine foreign matter 100 as described above, and the oil supply in which the oil 6 in the oil reservoir 20 is vertically passed through the crankshaft 4 by the pump 25 driven at the lower end of the crankshaft 4. The holes 26 can be supplied to the bearing portions 66 of the respective portions of the compression mechanism 2 and the sliding portions of the compression mechanism 2.

  As described above, the hermetic compressor according to the present invention can prevent entry of fine foreign matter existing in the refrigeration cycle into the compressor, so that in addition to refrigeration equipment such as an air conditioner and a refrigerator, It can also be applied to uses such as a heat pump type hot water supply device.

Sectional drawing which shows one closed type compressor which concerns on embodiment of this invention Sectional view showing a conventional example Sectional view showing a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 4a Main shaft part 6 Oil 7 Oil supply mechanism 11 Main bearing member 12 Fixed scroll 13 Orbiting scroll 14 Rotation restriction mechanism 15 Compression chamber 16 Intake pipe 17 Intake port 18 Exhaust Outlet 19 Lead wire 20 Oil reservoir 21 Sub-bearing 22 Pin 23, 24 Balance weight 25 Pump 26 Oil supply hole 27 Refrigerant gas 31 Discharge chamber in container 32 Compression mechanism communication path 33 Rotor upper chamber 34 Communication path 35 Rotor lower chamber 36 Rotor passage 37 Stator passage 38 Stator upper chamber 39 External discharge pipe 66 Bearing portion 100 Raised bottom 101 Fine foreign matter 102 Lower shell

Claims (5)

A compression mechanism in the sealed container, an electric motor for driving the compression mechanism provided below the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism, and a lower part in the sealed container It has an oil supply mechanism that supplies the oil in the oil reservoir provided through the crankshaft to the bearing portion of the crankshaft and the sliding portion of the compression mechanism. A hermetic compressor characterized in that when pumping up, the oil is pumped up from the top of the raised bottom, preventing fine foreign matter from pumping up together. 2. The hermetic compressor according to claim 1, wherein the bottom of the oil sump is provided with a raised bottom shape, so that the amount of oil to be sealed can be reduced and the cost can be reduced without changing the oil level. 2. The hermetic compressor according to claim 1, wherein the raised bottom portion is made of an inexpensive resin. 2. The hermetic compressor according to claim 1, wherein the raised bottom portion is made of a magnet so that iron powder or the like is kept in the lower shell portion. The hermetic compressor according to any one of claims 1 to 4, wherein carbon dioxide refrigerant is used and oil having a viscosity of 60 or more is used.