JP3894009B2 - Hermetic compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hermetic compressor for use in a refrigeration air conditioner, a refrigerator, or the like for business use, home use, or vehicle use.
[0002]
[Prior art]
Conventionally, this type of hermetic compressor is disclosed in JP-A-2001-280282. This will be described with reference to FIG. A compression mechanism 102 in the hermetic container 101, an electric motor 103 for driving the compression mechanism 102 provided below the compression mechanism 102, and a crankshaft 104 for transmitting the rotational force of the electric motor 103 to the compression mechanism 102 portion. And an oil supply mechanism 107 for supplying the oil 106 of the oil reservoir 105 provided at the lower part in the sealed container 101 to the bearing portion 166 of the crankshaft 104 and the sliding portion of the compression mechanism 102 through the crankshaft 104. The gas discharged from the container discharge chamber 131 in the upper part of the compression mechanism 102, the compression mechanism communication path 132 that connects the discharge chamber 131 in the container and the lower part of the compression mechanism 102, and the upper part of the rotor from the compression mechanism communication path 132 The communication path 134 following the chamber 133, the rotor upper chamber 133 and the rotor lower chamber 135 are provided in the rotor 103b so as to communicate with each other. It is provided between the stator 103a or the stator 103a and the sealed container 101 so as to reach the lower part of the motor 103 through the trochanter passage 136 and the rotor lower chamber 135 in order, and to further communicate the lower part and the upper part of the stator 103a. After passing through the formed stator passage 137 to the stator upper chamber 138 around the outside of the communication path 134, it passes through the external discharge pipe 139 provided at a portion of the hermetic container 101 at a position higher than the position of the stator upper chamber 138. An in-container gas passage A is provided so as to be discharged out of the hermetic container 101.
[0003]
In such a configuration, first, the in-container discharge chamber 131 in the upper part of the compression mechanism 102 and the compression mechanism communication path 132 that communicates the in-container discharge chamber 131 with the lower part of the compression mechanism 102 include the compression mechanism 102 and its bearing. 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 discharged to the rotor upper chamber 133. It is guided and passed through the rotor passage 136 of the rotor 103b and discharged to the rotor lower chamber 135 with a strong swirl flow that has been subjected to the rotation of the rotor 103b. By restricting and handling the gas discharged from the compression mechanism 102 in this way, the oil 106 supplied to the gas discharged from the compression mechanism 102 while passing through the inside of the compression mechanism 102 or around the bearing portion 166 and the oil 106 are used. Even if it is in contact with it, gas-liquid separation is performed by the strong swirling flow, and the oil 106 is driven outward to adhere to the inner periphery of the stator 103a of the motor 103, and from the gas near the oil sump 105. The oil 106 accompanying the gas can be efficiently separated because it is separated and hardly dropped on the gas and is dropped and collected in the oil reservoir 105 immediately below.
[0004]
Further, 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 and grows into oil droplets. The gas-liquid separation efficiency by centrifugation is further increased, and the oil droplets to be centrifuged are pressed against the inner periphery of the stator 103a, aggregate and grow further, and drop into the oil reservoir 105 below. The oil 106 is dripped into the oil sump 105, and after reaching the lower part of the stator 103a from the rotor lower chamber 135, it is difficult to take advantage of the gas flow toward the stator passage 137 after being turned upward. The gas flow is caused by centrifugal force at the time of the U-turn, and the oil 106 that is or is going to accompany the oil 106 also helps the gravity to lower the oil. Since the effect of fly shaken off also play toward the reservoir 105, the centrifuged, and still it is possible to increase the recovery rate of the oil remaining in the gas.
[0005]
[Problems to be solved by the invention]
However, in the conventional system, the gas discharged from the compression mechanism is supplied to them while passing through the inside of the compression mechanism or around the bearing portion, and then the oil that is forced to come into contact has a high differential pressure or high speed. Under the condition that the compression mechanism is excessively supplied, the relative amount of the oil to be mixed increases with respect to the gas. Therefore, there is a limit in efficiently separating the gas and the oil even by the centrifugal separation.
[0006]
It is an object of the present invention to handle a gas that has been sufficiently gas-liquid separated by handling the refrigerant gas and oil almost in a restraint even under conditions where excessive oil such as high differential pressure or high speed is supplied to the compression mechanism. An object of the present invention is to provide a hermetic compressor capable of discharging.
[0007]
[Means for Solving the Problems]
The hermetic compressor of 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 a crank for transmitting the rotational force of the electric motor to the compression mechanism unit. A shaft and an oil supply mechanism that supplies oil in an oil reservoir provided in the lower part of the sealed container to the bearing portion of the crankshaft and the compression mechanism sliding portion through the crankshaft, and the gas discharged from the compression mechanism is a compression mechanism A discharge chamber in the upper container, a compression mechanism communication path communicating from the discharge chamber in the container to the lower portion of the compression mechanism, a communication path continuing from the compression mechanism communication path to the rotor upper chamber, the rotor upper chamber and the rotor lower chamber Through the rotor passage provided in the rotor so as to communicate with the rotor, the lower chamber of the rotor, and under the motor, and further, the stator or the stator and the sealed container are connected so that the lower part and the upper part of the stator are communicated with each other. Fixed between After passing through the passage to the stator upper chamber around the outside of the communication path, it is discharged outside the sealed container through an external discharge pipe provided in a portion of the sealed container above the position of the stator upper chamber. An oil gas passage provided in the container and having lubricated the compression mechanism is connected to the compression mechanism discharge path below the compression mechanism, the rotor upper oil communication path communicating with the compression mechanism discharge path, the rotor upper oil communication path and the rotation The rotor oil communication passage is different from the rotor passage provided in the rotor so as to communicate with the child lower chamber.
[0008]
In such a configuration, first, the in-container discharge chamber at the upper part of the compression mechanism and the compression mechanism communication passage that communicates the in-container discharge chamber and the lower part of the compression mechanism are positioned outside the compression mechanism and its bearing portion. The gas discharged from the compression mechanism is collectively discharged into the communication passage below the compressor, and the gas discharged from the communication passage is guided to the rotor upper chamber and passes through the rotor passage of the rotor. The lower chamber is discharged with a strong swirling flow that receives the rotation of the rotor. 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 swirling flow, the oil is chased 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.
[0009]
In addition, the oil accompanying the gas passing through the rotor passage is pressed against the outer surface of the rotor passage by the centrifugal force generated by the rotation of the rotor and aggregates from the mist state to grow into oil droplets. Liquid separation efficiency is further increased, and the oil droplets that are centrifuged are pressed against the inner circumference of the stator and agglomerate to grow further and drop into the oil sump below. After dropping from the rotor lower chamber to the motor lower chamber, it is difficult to take advantage of the gas flow toward the stator passage after going up, and the U-turn gas flow is accompanied by the centrifugal force at the time of U-turn. The oil that is being or is going to accompany it is spun off and blown toward the lower oil sump with the help of its gravity. It is possible to increase the recovery rate of the oil remaining in the gas.
[0010]
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 from each other. When it reaches the child lower chamber, it is mixed with gas in the state of oil droplets discharged from the compression mechanism and agglomerated as it is, so that the gas-liquid separation efficiency by the centrifugal separation can be further increased.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a hermetic compressor according to an embodiment of the present invention will be described with reference to the drawings for understanding of the present invention.
[0012]
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. However, the present invention is not limited to this, and is applicable to all types of hermetic compressors that compress various types of compression mechanisms, such as rotary compression mechanisms, with the electric motor that drives them and the general gas contained in the hermetic container. Therefore, it is effective and belongs to the category of the present invention.
[0013]
As shown in FIG. 1, the hermetic compressor of 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 bolts on the main bearing member 11. The scroll-type compression mechanism 2 is configured by sandwiching the orbiting scroll 13 that meshes 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. Then, an anti-rotation mechanism 14 such as an Oldham ring that guides the circular scroll to move is provided, and the orbiting scroll 13 is eccentrically driven by the eccentric shaft portion 4 a 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 moves small from the outer peripheral side to the center portion. The refrigerant gas that has become a predetermined pressure or higher as the refrigerant gas is compressed by sucking and compressing the refrigerant gas from the suction pipe 16 communicating with the outside of the sealed container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12 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.
[0014]
The lower end of the crankshaft 4 reaches the oil sump 20 at the lower end of the sealed container 1 and is supported by the auxiliary bearing member 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 member 21, and is integrally formed with a stator 3 a fixed to the sealed container 1 by welding or shrink fitting, and the outer periphery in the middle of the crankshaft 4. Balance weights 23 and 24 are provided at the outer peripheral portions of the upper and lower end surfaces of the rotor 3b, and the rotor 3b and the crankshaft 4 are stabilized. And the orbiting scroll 13 can be stably moved in a circular orbit.
[0015]
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 sump 20.
[0016]
However, in fact, as described above, the refrigerant gas 27 shown by the broken line arrow in FIG. 1 discharged from the compression mechanism 2 is accompanied by the oil 6 that is in contact with the compression mechanism 2 or the main bearing member 11. There is a problem that the supplied oil 6 dripping below is scattered and accompanied, and the oil cannot be sufficiently separated conventionally and the oil is discharged together with the refrigerant gas discharged outside the sealed container 1. .
[0017]
In the embodiment shown in FIG. 1, in order to solve such a problem, the refrigerant gas 27 discharged from the compression mechanism 2 is compressed into the container discharge chamber 31 above the compression mechanism 2 and the container discharge chamber 31. A compression mechanism communication path 32 for communicating the lower part of the mechanism 2, a communication path 34 continuing from the compression mechanism communication path 32 to the rotor upper chamber 33, and the rotor 3 b so as to communicate the rotor upper chamber 33 and the rotor lower chamber 35. The stator 3a or the stator 3a and the hermetic container 1 so as to reach the lower part of the motor 3 through the rotor passage 36 and the rotor lower chamber 35 provided in this order, and to communicate with the lower part and the upper part of the stator 3a. After passing through the stator passage 37 provided between them and the stator upper chamber 38 around the outside of the communication path 34, the external discharge provided in the portion above the position of the stator upper chamber 38 of the sealed container 1. Outside sealed container through pipe 39 It is provided with a container inside the gas passage A that to be discharged.
[0018]
The in-container discharge chamber 31 of the in-container gas passage A and the compression mechanism communication passage 32 are positioned outside the compression mechanism 2 and its bearing portion 66 to allow the refrigerant gas 27 discharged from the compression mechanism 2 to flow. Collective discharge is performed 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 and allows the refrigerant gas 27 to enter the rotor passage 36 in a state in which it slowly turns due to the rotation of the rotor 3b and the balance weight 23 and moves downward. The passing through rotor lower chamber 35 is discharged with a strong swirl flow B that has been subjected to the rotation of the rotor 3b.
[0019]
On the other hand, the oil 6 supplied to the compression mechanism 2 by the oil supply mechanism 7 lubricates the bearing portions 66 of the compression mechanism 2 and the sliding portions of the compression mechanism 2, and then is discharged from the compression mechanism discharge path 41 to the lower portion of the compression mechanism 2. Is done. After that, it passes through the rotor upper oil communication passage 42 which is a space separated from the rotor upper chamber 33, 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.
[0020]
In this way, the refrigerant gas 27 discharged from the compression mechanism 2 is restrained and handled, so that the refrigerant gas 27 discharged from the compression mechanism 2 is supplied to them while passing through the compression mechanism 2 and around the bearing portion 66. Even if the oil 6 comes into contact with the oil 6 and is accompanied by it, gas separation is performed by the strong swirling flow B, and the oil 6 is driven outward to adhere to the inner periphery of the stator 3a and close to the oil reservoir 20. The oil 6 is effectively separated from the refrigerant gas 27 as indicated by a solid arrow, and thereafter, the separated oil 6 is dripped into the oil reservoir immediately below while being transferred, and is collected with almost no opportunity to ride the refrigerant gas 27. Therefore, the oil 6 accompanying the refrigerant gas 27 can be efficiently separated and recovered.
[0021]
Further, the oil 6 accompanying the refrigerant gas 27 passing through the rotor passage 36 is pressed against the outer surface of the rotor passage 36 by the centrifugal force caused by the rotation of the rotor 3b, and aggregates from the mist state and grows into oil droplets. Further, the gas-liquid separation efficiency by the centrifugal separation is further enhanced, and the oil droplets to be centrifuged are pressed against the inner periphery of the stator 3a to aggregate, grow larger and drop into the oil reservoir 20 below. The separated oil 6 drops into the oil reservoir 20, and 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 turning upward. The flow C of the refrigerant gas 27 that makes the U-turn is caused by the centrifugal force at the time of the U-turn, and the oil 6 that accompanies or intends to accompany the oil 6 also helps the gravity to the lower oil reservoir 20. Only shaken, and since the action flick, the centrifuged, also can increase the recovery of oil 6 are still remaining in the refrigerant gas 27.
[0022]
Further, a gas passage from the rotor upper chamber 33 to the rotor passage 36 and an 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. Therefore, when it reaches the rotor lower chamber 35, it mixes with the gas in the state of oil droplets discharged from the compression mechanism 2 and agglomerated as it is, so that the 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, the oil 6 contained in a small amount of the refrigerant gas 27 leaking directly from the vicinity of the rotor upper chamber 33 to the stator upper chamber 38 is Only a small amount of oil 6 supplied mainly at the time of the compression chamber 15 is obtained, and the oil separation efficiency with respect to the refrigerant gas 27 discharged outside the sealed container 1 can be further increased.
[0023]
【The invention's effect】
According to the present invention, as is apparent from the above description, the discharge gas from the compression mechanism and the compression mechanism that accompanies the discharge gas and the oil that has been supplied to the bearing portion are substantially restrained and handled. After passing through the passage and subjecting it to strong centrifugal separation by rotation of the rotor and performing efficient centrifugation, gas u-turn in the lower chamber of the motor and the resulting centrifugal separation of the oil, from the stator passage to the upper portion of the stator The main cause is to prevent contact with the gas before oil separation entering the rotor passage from the compression mechanism while discharging to the chamber, and discharge the gas outside the sealed container. However, the gas from which the oil has been sufficiently separated can be discharged and supplied outside the sealed container.
[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.
DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 6 Oil 7 Oil supply mechanism 17 Inlet 18 Discharge 20 Oil sump 23, 24 Balance weight 27 Refrigerant gas 31 Discharge chamber 32 in the container 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 41 Compression mechanism discharge passage 42 Rotor upper oil communication passage 43 Rotor oil communication passage

Claims (1)

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 An oil supply mechanism for supplying the oil in the provided oil reservoir to the bearing portion of the crankshaft and the compression mechanism sliding portion through the crankshaft,
Gas discharged from the compression mechanism is discharged from the discharge chamber in the container above the compression mechanism, a compression mechanism communication path communicating from the discharge chamber in the container to the lower portion of the compression mechanism, and the communication from the compression mechanism communication path to the rotor upper chamber. The rotor passage and rotor lower chamber provided in the rotor so as to communicate the 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. After passing through the stator or the stator passage provided between the stator and the airtight container to the stator upper chamber around the outside of the communication path, and then provided in a portion above the position of the stator upper chamber of the airtight container. A gas passage in the container is provided to be discharged out of the sealed container through the external discharge pipe formed,
Oil that has lubricated the compression mechanism communicates the compression mechanism discharge path below the compression mechanism, the rotor upper oil communication path communicating with the compression mechanism discharge path, and the rotor upper oil communication path and the rotor lower chamber. Thus, a hermetic compressor characterized in that it passes through a rotor oil communication path different from the rotor path provided in the rotor.

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