JP2003269355A - Sealed compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To almost restrictively treat a refrigerant and oil, and to deliver gas sufficiently separated from liquid. <P>SOLUTION: Refrigerant gas 27 from a compression mechanism 2 and oil 6 after supply to the compression mechanism 2 and a bearing part 66 are almost restricted, and the refrigerant gas 27 is passed through a rotor passage 36 from a rotor upper chamber 33. The oil 6 is passed through a rotor oil communicating passage 43 from a rotor upper oil communicating passage 43 separately from this refrigerant gas 27, introduced to a rotor lower chamber 35, and offered for forced turning by rotation of a rotor 3b, to centrifuge the gas and the liquid. The refrigerant gas 27 separated from the oil is passed through a stator passage 37 from a lower part of a stator 3a, introduced to a stator upper chamber 38 outside a restricting area, and delivered outside a sealed vessel 1 from a part above a position of the stator upper chamber 38 of the sealed vessel 1. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor for use in refrigeration and air conditioning for business use, home use, or vehicle use, or a refrigerator. [0002] Conventionally, this type of hermetic compressor is disclosed in
001-280282. This will be described with reference to FIG. The compression mechanism 102 is placed in the sealed container 101.
And a compression mechanism 102 provided below the compression mechanism 102
Through the crankshaft 104, the crankshaft 104 for transmitting the rotational force of the motor 103 to the compression mechanism 102, and the oil 106 in the oil sump 105 provided in the lower part of the sealed container 101. An oil supply mechanism 107 that supplies the bearing portion 166 of the crankshaft 104 and the sliding portion of the compression mechanism 102, and the gas discharged from the compression mechanism 102 is discharged into the container discharge chamber 131 in the upper portion of the compression mechanism 102, Discharge chamber 131 and compression mechanism 102
A compression mechanism communication path 132 for communicating the lower part of the compressor, and a communication path 1 extending from the compression mechanism communication path 132 to the rotor upper chamber 133.
34, the rotor passage 13 provided in the rotor 103b so that the rotor upper chamber 133 and the rotor lower chamber 135 communicate with each other.
6, a stator provided between the stator 103a or the stator 103a and the hermetic container 101 so that the lower part 135 of the stator 103a is communicated with the lower part and the upper part of the stator 103a. After passing through the child passage 137 to the stator upper chamber 138 outside the communication path 134, the sealed container 101 passes through the external discharge pipe 139 provided in a portion of the sealed container 101 at a position higher than the position of the stator upper chamber 138. Gas passage A in the container to be discharged outside
It is characterized by providing. In such a configuration, first, the compression mechanism 10
2 and the in-container discharge chamber 131 and the in-container discharge chamber 1
31 and a compression mechanism communication path 132 that allows the lower part of the compression mechanism 102 to communicate with each other.
The gas discharged from the compression mechanism 102 is collectively discharged to the communication path 134 below the compression mechanism 102, and the gas discharged from the communication path 134 is guided to the rotor upper chamber 133. Rotor passage 136 of rotor 103b
Through the inside, the rotor lower chamber 135 is discharged with a strong swirl flow that receives the rotation of the rotor 103b. By restricting and handling the gas discharged from the compression mechanism 102 in this way, the gas discharged from the compression mechanism 102 is compressed into the compression mechanism 1.
02, even if it is in contact with the oil 106 supplied to the oil 106 while passing through the bearing portion 166 or the bearing portion 166, the gas 1 is separated by the strong swirl flow, and the oil 1
The stator 103a of the electric motor 103 is chased outside 06
It is attached to the inner periphery of the oil and separated from the gas in the vicinity of the oil sump 105, so that there is almost no chance to get on the gas and it is dropped and collected in the oil sump 105 immediately below. The oil 106 that is present can be separated efficiently. The oil 106 accompanying the gas passing through the rotor passage 136 is pressed against the outer surface of the rotor passage 136 by the centrifugal force generated by the rotation of the rotor 103b, and aggregates from the mist state to grow into oil droplets. Therefore, the gas-liquid separation efficiency by the centrifugal separation is further increased, and the oil droplets that are centrifuged are pressed against the inner periphery of the stator 103a, aggregate, grow larger, and drop into the oil reservoir 105 below. Oil 106 after liquid separation is oil reservoir 10
5 to the stator 10 from the rotor lower chamber 135
After reaching the lower part of 3a, it is difficult to take advantage of the gas flow toward the stator passage 137 by making an upward turn, and the flow of the gas to be turned is accompanied by or will be accompanied by the centrifugal force at the time of the turn. 10
6 is also squeezed into the lower oil reservoir 105 with the help of its gravity, so that the recovery rate of the oil that has been centrifuged and still remaining in the gas can be increased. However, in the conventional system, the gas discharged from the compression mechanism is forced to contact after being supplied to them while passing through the compression mechanism or around the bearing portion. When the oil to be mixed is excessively supplied to the compression mechanism, such as high differential pressure or high speed, the relative amount of oil to be mixed with the gas increases. Are limited in separation. An object of the present invention is to achieve sufficient gas-liquid separation by handling the refrigerant gas and oil almost constrained even under conditions where excessive pressure or high speed oil is supplied to the compression mechanism. Another object of the present invention is to provide a hermetic compressor that can discharge the gas. A hermetic compressor according to the present invention includes a compression mechanism in a hermetic container, an electric motor for driving the compression mechanism provided below the compression mechanism, and an electric motor for the electric motor. A crankshaft for transmitting rotational force to the compression mechanism, and an oil supply mechanism for supplying oil in an oil reservoir provided in the lower part of the hermetic container to the crankshaft bearing and compression mechanism sliding portion through the crankshaft. The gas discharged from the compression mechanism is connected to the discharge chamber in the container at the upper part of the compression mechanism, the compression mechanism communication path communicating from the discharge chamber in the container to the lower part of the compression mechanism, and the compression mechanism communication path to the rotor upper chamber. The rotor passage, the rotor lower chamber, and the rotor lower chamber, which are provided in the rotor so as to communicate between the communication passage, the rotor upper chamber and the rotor lower chamber, sequentially reach the motor, and further communicate the lower and upper portions of the stator. As the stator also Is passed through the stator passage provided between the stator and the airtight container, and after passing through the stator upper chamber around the outside of the communication path, the external portion provided above the position of the airtight container upper chamber of the airtight container. A rotor in which an in-container gas passage is provided to be discharged out of the hermetic container through a discharge pipe, and the oil that has lubricated the compression mechanism communicates with the compression mechanism discharge path below the compression mechanism and the compression mechanism discharge path The upper oil communication path, and the rotor upper oil communication path and the rotor lower chamber are communicated with each other through a rotor oil communication path different from the rotor path provided in the rotor. . In such a configuration, first, the discharge chamber in the container at the upper part of the compression mechanism and the compression mechanism communication passage for communicating the discharge chamber in the container and the lower part of the compression mechanism are connected to the outer periphery of the compression mechanism and its bearing portion. The gas discharged from the compression mechanism is collectively discharged into the communication passage at the lower portion of the compressor, and the gas discharged from the communication passage is guided to the rotor upper chamber to pass through the rotor passage of the rotor. It discharges with a strong swirling flow that receives the rotation of the rotor to the lower rotor chamber. By restricting and handling the gas discharged from the compression mechanism in this way, the gas discharged from the compression mechanism comes into contact with the oil supplied to them while passing through the compression mechanism and around the bearing portion. Even if accompanied, gas-liquid separation is performed by the strong swirl flow, the oil is driven outward, attached to the inner periphery of the stator of the motor, separated from the gas near the oil sump, and there is almost an opportunity to ride on the gas The oil accompanying the gas can be efficiently separated because it is dropped and collected in the oil reservoir immediately below. Also, the oil accompanying the gas passing through the rotor passage is pressed against the outer surface of the rotor passage by the centrifugal force due to the rotation of the rotor and aggregates from the mist state and grows into oil droplets. The gas-liquid separation efficiency by separation is further increased, and the oil droplets that are centrifuged are pressed against the inner circumference of the stator and aggregate to grow further and drop into the oil sump below. After dropping from the rotor lower chamber to the motor lower chamber to drop into the oil sump, it is difficult to take advantage of the gas flow toward the stator passage after going up, and the U-turn gas flow is centrifugal force during U-turn. Because of this, the oil that accompanies or intends to accompany it is spun off and blown toward the lower oil sump with the help of its gravity. , And still it is possible to increase the recovery rate of the oil remaining in the gas. Further, the gas passage from the rotor upper chamber to the rotor communication passage and the oil passage from the compression mechanism discharge passage to the rotor upper oil communication passage and the rotor oil communication passage are separated. When the rotor lower chamber is reached,
Since the oil droplets discharged from the compression mechanism and aggregated as they are are mixed with the gas, the gas-liquid separation efficiency by the centrifugal separation can be further increased. DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic compressor according to an embodiment of the present invention will be described below with reference to the drawings.
For the understanding of the present invention. The embodiment of the present invention is an example of a closed type compressor for a refrigeration cycle incorporating a vertical scroll-type compression mechanism, and a compression target is a refrigerant gas. But,
The present invention is not limited to this, and various compression mechanisms, such as a rotary compression mechanism, are applied to general hermetic compressors that compress general gas contained in a sealed container together with an electric motor that drives the compression mechanism. It is effective and belongs to the category of the present invention. 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 a hermetic container 1 and the main bearing member 1.
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 bolted to 1, and the orbiting scroll 13 between the orbiting scroll 13 and the main bearing member 11.
Is provided with an anti-rotation mechanism 14 such as an Oldham ring that guides it so as to move in a circular orbit, and an orbiting scroll 1 at an eccentric shaft portion 4 a at the upper end of the crankshaft 4.
3 is driven eccentrically so that the orbiting scroll 13 moves in a circular orbit, so that 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. The refrigerant gas that has been used and compressed by sucking and compressing the refrigerant gas from the suction pipe 16 communicating with the outside of the hermetic container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12 becomes the center of the fixed scroll 12. The reed valve 19 is pushed open from the discharge port 18 of the unit and discharged into the sealed container 1 is repeated. 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 member 21 fixed by welding or shrink fitting in the sealed container 1 so that it can rotate stably. Can do. The electric motor 3 is a main bearing member 11.
And a sub-bearing member 21, a stator 3 a fixed to the sealed container 1 by welding or shrink fitting, and a rotor 3 b integrally coupled to the outer periphery of the crankshaft 4. The balance weights 23 and 24 are fixed to the outer peripheral portions of the upper and lower end surfaces of the rotor 3b by pins 22.
Thereby providing a rotor 3b and a crankshaft 4
Can rotate stably, and 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 passes through the oil supply hole 26 passing through the crankshaft 4 and the bearing portions 66 of each part of the compression mechanism 2. Or supplied to each sliding portion of the compression mechanism 2. 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 sump 20. However, actually, as already described, the refrigerant gas 27 shown by the broken line arrow in FIG.
Is accompanied by the oil 6 that has come into contact with the compression mechanism 2 or the supplied oil 6 dripping below the main bearing member 11 is scattered and accompanied. There is a problem that oil cannot be separated and oil is discharged together with the refrigerant gas discharged outside the sealed container 1. In the embodiment shown in FIG. 1, in order to solve such a problem, the refrigerant gas 2 discharged from the compression mechanism 2 is used.
7 is a container discharge chamber 31 in the upper part of the compression mechanism 2, a compression mechanism communication path 32 that connects the discharge chamber 31 in the container and the lower part of the compression mechanism 2, and the compression mechanism communication path 32 to the rotor upper chamber 33. The communication path 34, the rotor upper chamber 33 and the rotor lower chamber 35 are communicated with each other through the rotor passage 36 and the rotor lower chamber 35 provided in the rotor 3b in order to communicate with the rotor 3b. 3a passes through the stator 3a or the stator passage 37 provided between the stator 3a and the hermetic container 1 so that the lower part and the upper part communicate with each other. After that, an in-container gas passage A is provided so as to be discharged out of the sealed container through an external discharge pipe 39 provided in a portion of the sealed container 1 beyond the position of the stator upper chamber 38. The in-container discharge chamber 31 of the in-container gas passage A and the compression mechanism communication passage 32 are located outside the compression mechanism 2 and its bearing portion 66, and are discharged from the compression mechanism 2. The gas 27 is collectively discharged to the communication path 34 below the compression mechanism 2. Subsequently, the communication path 34 guides the discharged refrigerant gas 27 to the rotor upper chamber 33, thereby rotating the rotor 3.
b and the balance weight 23 are rotated under the influence of the rotation of the balance weight 23, enter the rotor passage 36, pass through the lower passage 35, and discharge to the rotor lower chamber 35 with the strong swirl flow B subjected to the rotation of the rotor 3b. Let On the other hand, the oil 6 supplied to the compression mechanism 2 by the oil supply mechanism 7 is the bearing portion 66 of the compression mechanism 2 or the compression mechanism 2.
Each of the sliding portions is lubricated and then discharged from the compression mechanism discharge passage 41 to the lower portion of the compression mechanism 2. Thereafter, the rotor upper chamber 33
It passes through the rotor upper oil communication passage 42 which is a space separated from the rotor passage 36, and then reaches the rotor lower chamber 35 through the rotor oil communication passage 43 different from the rotor passage 36. In some cases, the balance weight 23 may be configured so that the rotor upper chamber 33 and the rotor upper oil communication passage 42 are separated from each other. By restricting and handling the refrigerant gas 27 discharged from the compression mechanism 2 in this way, the refrigerant gas 27 discharged from the compression mechanism 2 is moved into the compression mechanism 2 or the bearing portion 66.
Even if the oil 6 that has been supplied to the oil 6 comes in contact with it and passes through it, gas-liquid separation is performed by the strong swirling flow B, and the oil 6 is driven outward to drive the inner circumference of the stator 3a. The oil 6 is effectively separated from the refrigerant gas 27 near the oil reservoir 20 as indicated by a solid line arrow, and the oil 6 separated thereafter is dropped into the oil reservoir immediately below and is carried on the refrigerant gas 27. Since the recovery is performed with almost no opportunity, the oil 6 accompanying the refrigerant gas 27 can be efficiently separated and recovered. The refrigerant gas 27 passing through the rotor passage 36 is also shown in FIG.
Since the oil 6 accompanying the oil is pressed against the outer surface of the rotor passage 36 by the centrifugal force generated by the rotation of the rotor 3b and aggregates from the mist state to grow into oil droplets, the gas-liquid separation efficiency by the centrifugal separation is further increased. The oil droplets that are to be centrifuged and separated are pressed against the inner circumference of the stator 3a, aggregate, and further grow and drop into the oil reservoir 20 below.
The oil 6 after gas-liquid separation drops into the oil reservoir 20, but after reaching the motor lower chamber from the rotor lower chamber 35, it is difficult to take advantage of the flow C of the refrigerant gas 27 toward the stator passage 37 after making an upward turn. In addition, the flow C of the refrigerant gas 27 that makes a U-turn is caused to act by causing the centrifugal force at the time of U-turn to shake the oil 6 that is or is going to accompany it toward the lower oil reservoir 20 with the help of its gravity, and also to blow it off. As a result, the recovery rate of the oil 6 that has been centrifuged and that still remains in the refrigerant gas 27 can be increased. Further, the rotor passage 3 extends from the rotor upper chamber 33.
6 and the oil passage from the compression mechanism discharge passage 41 to the rotor upper oil communication passage 42 and the rotor oil communication passage 43 are separated from each other, so that the rotor lower chamber 35 is reached. At that time, in order to mix with gas in the state of oil droplets discharged from the compression mechanism 2 and agglomerated as they are,
Gas-liquid separation efficiency by the centrifugal separation can be further increased. Since mixing of the refrigerant gas 27 and the oil 6 in the vicinity of the rotor upper chamber 33 is suppressed, a small amount of refrigerant gas 2 leaks directly from the vicinity of the rotor upper chamber 33 to the stator upper chamber 38.
The oil 6 contained in the flow 7 is mainly only a small amount of the oil 6 supplied at the time of the compression chamber 15, and the oil separation efficiency with respect to the refrigerant gas 27 discharged to the outside of the sealed container 1 can be further increased. As is apparent from the above description, according to the present invention, the gas discharged from the compression mechanism, the accompanying compression mechanism and the oil after being supplied to the bearing portion are supplied. Handle it almost constrained, and after passing through the rotor passage, it is subjected to strong centrifugal separation by rotating the rotor to perform efficient centrifugation, and then the gas u-turn in the lower chamber of the motor and the resulting oil centrifugation As a result, the main part of the motor part is to prevent the oil from entering the rotor passage from the compression mechanism and contact with the gas before oil separation while discharging from the stator passage to the stator upper chamber. A gas sufficiently separated from oil can be discharged and supplied outside the sealed container while cooling the discharge gas.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a hermetic compressor according to an embodiment of the present invention. FIG. 2 is a sectional view showing a conventional hermetic compressor. Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 6 Oil 7 Oil supply mechanism 17 Suction port 18 Discharge port 20 Oil reservoir 23, 24 Balance weight 27 Refrigerant gas 31 In-container discharge chamber 32 Compression mechanism communication passage 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 41 Compression mechanism discharge passage 42 Rotor upper oil communication passage 43 Rotor oil communication passage

   ──────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Kono             1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric             Within Sangyo Co., Ltd. (72) Inventor ▲ Yoshi ▼ Hirofumi Ta             1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric             Within Sangyo Co., Ltd. F-term (reference) 3H029 AA02 AA14 AB03 BB05 BB35                       CC07 CC16 CC44                 3H039 AA12 BB16 CC12 CC27 CC32

Claims (1)

What is claimed is: 1. A compression mechanism in a sealed container; an electric motor for driving a compression mechanism provided below the compression mechanism; and a rotational force of the electric motor for transmitting to the compression mechanism section. And an oil supply mechanism that supplies 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, and the gas discharged from the compression mechanism is Discharge chamber in the container at the upper part of the compression mechanism, a compression mechanism communication path communicating from the discharge chamber in the container to the lower part of the compression mechanism, a communication path extending from the compression mechanism communication path to the rotor upper chamber, the rotor upper chamber and the rotor Stator or stator and hermetic container so that the lower passage and the upper portion of the stator communicate with each other through the rotor passage provided in the rotor so as to communicate with the lower chamber and the lower chamber of the rotor. Established between After passing through the stator passage and into the stator upper chamber around the outside of the communication path, it is discharged out of the sealed container through an external discharge pipe provided in a portion of the sealed container above the position of the stator upper chamber. A gas passage in the container is provided, and oil that has lubricated the compression mechanism is a compression mechanism discharge passage at the bottom of the compression mechanism, a rotor upper oil communication passage that communicates with the compression mechanism discharge passage, and this rotor upper oil communication passage. And a rotor oil communication passage that is different from the rotor passage provided in the rotor so as to communicate with the rotor lower chamber.