JPH09151886A - Hermetic type rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve capacity to separate refrigerant gas and misty lubrication oil from each other by an oil separating mechanism and to reduce an amount of lubrication oil discharged to the outside of a machine body. SOLUTION: A rotary compression element 10 and a motor-driven element 20 situated above the rotary compression element 10 are contained in the inner lower part of a closed container 1. A refrigerant pass hole 35 through which refrigerant gas discharged from the rotary compression element 10 passes is vertically formed through the lamination core 32 of a rotor 31. A plate disc-form oil separating disc 41 rotated in synchronism with a crank shaft 21 is arranged at the upper part of the rotor 31. Misty lubrication oil mixed with refrigerant gas passing the refrigerant pass hole 35 formed through the lamination core 32 of the rotor 31 is separated by the oil separation disc 41, and a cap type end member 36 in the shape of a cylinder with a bottom is arranged at least on the lower end face side of the rotor 31 in such a state to communicate with the refrigerant pass hole 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary compressor used in, for example, a refrigerator or an air conditioner, and more particularly to a refrigerant concentration function of a refrigerant gas discharged from a rotary compression element to a rotor in an electric element. By doing so, the ability of the oil separation mechanism to separate the refrigerant gas from the mist-like lubricating oil is enhanced, and the discharge amount of the lubricating oil discharged to the outside of the machine body is reduced.

[0002]

2. Description of the Related Art Conventionally, in a hermetic rotary compressor of this type, as disclosed in, for example, Japanese Utility Model Publication No. 5-7519, a refrigerant gas compressed by a rotary compression element and discharged is in mist form. The oil (lubricating oil) is passed through the gap between the closed container and the stator and the air gap between the stator and the rotor, and the oil is separated in the process, and only the refrigerant gas is discharged to the outside of the machine. .

However, in such a conventional hermetic rotary compressor, if the refrigerant gas and the lubricating oil are not sufficiently separated in the machine, the refrigerant gas containing the lubricating oil flows into the external circuit, which causes , Not only does the cooling efficiency decrease,
The lubricating oil stored in the oil reservoir at the inner bottom of the airtight container was insufficient, and the smooth operation of the compression part of the rotary compression element and the electric element driving this compression part was lost, which in turn resulted in burnout of the machine body. May be caused.

In order to solve the above-mentioned problems, therefore, as shown in FIG. 9, a rotary compression element b is housed in the lower part of the closed container a, and an electric element c is housed in the upper part of the rotary compression element b. This electric element c is rotatably inserted in the stator d and the stator d is rotatably compressed in the central shaft portion thereof.
And a rotor f formed of a laminated iron core incorporating a permanent magnet to which a crankshaft e for driving
A coolant passage hole g for passing the coolant gas discharged from the rotary compression element b is vertically formed therethrough, and an oil separation mechanism h that rotates in synchronization with the crankshaft e is provided above the rotor f. There is a configuration in which mist-like lubricating oil mixed with the refrigerant gas discharged through the refrigerant passage hole g of the rotor f at h is separated.

[0005]

However, in the synchronous motor having the permanent magnet type rotor in such a conventional hermetic rotary compressor, the rotary compression element is indicated by the solid arrow in FIG. The refrigerant gas discharged from b impinges on the lower end surface of the rotor f and enters the refrigerant passage hole g formed through the rotor f and the air gap E formed between the stator d and the rotor f. Since the oil is dispersed, it is not possible to sufficiently exert the ability of the oil separation mechanism h to separate the refrigerant gas and the mist-like lubricating oil.
There is a problem that not only the function of the compressor itself is deteriorated but also the amount of lubricating oil discharged outside the machine body increases.

An object of the present invention is to enhance the ability of an oil separation mechanism to separate a refrigerant gas from a mist-like lubricating oil and to reduce the discharge amount of the lubricating oil discharged to the outside of the machine body. A type rotary compressor is provided.

[0007]

In order to solve the above-mentioned problems, the present invention accommodates a rotary compression element in a lower part of an airtight container and an electric element above the rotary compression element. Is formed of a stator and a rotor composed of a laminated iron core having a permanent magnet rotatably inserted in the stator and having a crankshaft for driving the rotary compression element mounted on the central shaft portion thereof. In the hermetically-sealed rotary compressor having a laminated iron core of the rotor, which is vertically formed with a refrigerant passage hole through which a refrigerant gas discharged from the rotary compression element passes, in the upper part of the rotor and the crankshaft. A flat disc-shaped oil separation plate that rotates in synchronization is provided, and a mist-like lubricating oil mixed with the refrigerant gas discharged through the refrigerant passage hole formed through the laminated iron core of the rotor by this oil separation plate is mixed. As they are separated The bottom end side of the rotor has a structure in which a bottomed cylindrical cap-type end member is placed in communication with the refrigerant passage hole. In this case, the cap-type end member is It is also possible to arrange the upper end surface side in communication with the refrigerant passage hole.

Further, according to the present invention, a rotary compression element is housed in the lower part of the closed container, and an electric element is housed in the upper part of the rotary compression element, and the electric element is rotatably installed in the stator and the stator. A rotor made of a laminated iron core having a built-in permanent magnet in which a crankshaft for driving the rotational compression element is mounted on the central axis portion of the rotor. The rotational compression element is formed on the laminated iron core of the rotor. In a hermetic rotary compressor formed by vertically penetrating a refrigerant passage hole through which a refrigerant gas discharged from the rotor is passed, a pair of upper and lower cap-type end members are passed through the refrigerant on upper and lower end surfaces of a laminated iron core of the rotor. A structure in which a cap-type oil separator is fitted and held in a closed state on the upper cap-type end member, and a refrigerant outlet is provided on the peripheral side surface of the oil separator. And what In order to fit and hold the oil separator in the lid state in the upper cap type end member, a locking claw is provided so as to project from the outer surface of the oil separator, and the locking claw is provided in the upper cap mold. The engaging hole is provided so as to correspond to the side surface of the end member.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
1 will be described in detail with reference to the drawings shown in FIG.
3 to 3 show the first embodiment of the hermetic rotary compressor according to the present invention.

As shown in FIG. 1, reference numeral 1 is a closed container,
The closed container 1 includes a cylindrical body 2 having a bottom and a body 2
Is formed with the end case 3 that covers and closes the upper end opening 2a of the lubricating oil O.
Is the oil sump 4 in which is stored.

In the lower part of the closed container 1, for example, a two-cylinder type rotary compression element 10 is housed. The rotary compression element 10 is a pair of upper and lower cylinders arranged with a partition plate 11 interposed therebetween. 12A and 12B, and lower eccentric portions 21A and 21B of a crankshaft 21 which are provided in the compression chambers P1 and P2 of the cylinders 12A and 12B and are rotationally driven by an electric element 20 described later are fitted and inserted into 180 °. Eccentric rollers 13A and 13B that rotate eccentrically in conjunction with each other
And upper and lower bearing members 14A and 14B that are fastened and fixed to the upper and lower end surfaces of the cylinders 12A and 12B by bolts 15A and 15B, respectively, to support the crankshaft 21.
It is composed of

Further, each of the cylinders 12A and 12B
Are formed with refrigerant gas suction passages 16A, 16B communicating with the compression chambers P1, P2, respectively, and these suction passages 16A, 16B are formed on the lower side surface of the body portion 2 of the closed container 1. It is connected to the provided refrigerant gas suction pipes 5A and 5B, respectively.

Further, the upper and lower bearing members 14A, 14
In B, cups 17A, 17A forming a muffler chamber for reducing noise due to pressure pulsation of the refrigerant gas during operation are provided.
B are respectively fitted to the upper cup 17A, and a discharge port 18A communicating with the low-pressure side space 1A in the closed container 1 is provided in the upper cup 17A, and the discharge port 18A is provided in the first compression chamber P1. The compressed refrigerant gas is discharged to the low pressure side space 1A in the closed container 1.

On the other hand, a discharge passage 18B is provided on the outer peripheral edge side of the cylinders 12A, 12B and the lower bearing member 14B, and the discharge passage 18B is provided with a communication pipe 6 provided on the outer side portion of the closed container 1. Communicating with the low-pressure side space 1A in the closed container 1 and discharging the refrigerant gas compressed in the second compression chamber P2 to the low-pressure side space 1A in the closed container 1. is there.

That is, the rotary compression element 10 passes through the suction passages 16A, 16B from the refrigerant gas suction pipes 5A, 5B by the eccentric rotation of the eccentric rollers 13A, 13B by the rotational driving of the crankshaft 21 of the electric element 20. The refrigerant gas sucked into the compression chambers P1 and P2 of the cylinders 12A and 12B is compressed, the compressed high-pressure refrigerant gas is discharged into the closed container 1, and the rotor 31 of the electric element 20 is also compressed. It is discharged to the high pressure side space 1B in the upper part of the closed container 1 through the refrigerant passage hole 35 and the air gap E provided in the above, or is further discharged from the discharge pipe 7 provided in the end case 3 to the outside of the machine body. As a result, the refrigeration unit circuit (not shown) is made to discharge.

The electric element 20 for driving the crankshaft 21 which is interlocked with the rotary compression element 10 is a stator 22 housed and fixed in the upper part of the hermetically sealed container 1, and is freely rotatable on the stator 22. A permanent magnet (not shown) embedded in the rotor 31 and a rotor 31 in which the upper part of the crankshaft 21 is fixed to the central shaft portion of the rotor 31 in a press-fitted state. And the stator 22 is
Laminated iron core 23 composed of a laminated body of thin iron plates in which a silicon steel plate is punched into a substantially annular shape and slots are formed on the inner periphery thereof.
And a fixed winding 24 formed by winding a plurality of layers on the laminated iron core 23 with a predetermined angular difference in the circumferential direction, and a vertical groove is formed on the outer peripheral side surface of the stator 22. Two
5 is cut along the up-down direction, and a channel through which the refrigerant gas and the mist-like lubricating oil can pass is formed in the vertical groove 25 with the inner peripheral side surface of the closed container 1. ing.

On the other hand, the rotor 31 has a cylindrical laminated iron core 32 having flat upper and lower end surfaces in which permanent magnets (not shown) made of a laminated body of silicon steel plates are embedded, and the center of the laminated iron core 32. An insertion hole 33, through which the crankshaft 21 is formed through the shaft portion, is inserted and fixed in a press-fitted state, and a plurality of insertion holes through which a rod-shaped fixing member such as a rivet formed through the outer peripheral portion of the insertion hole 33 is inserted. 34, a plurality of refrigerant passage holes 35 formed vertically through the outer peripheral portion of the insertion hole 34, and end members 36 and 36 arranged on the upper and lower end surfaces 32a and 32b of the laminated iron core 32, respectively. It is assembled.

As shown in FIGS. 2 and 3, each of the end members 36 has a bottomed cylindrical cap shape, and the laminated iron core 32 of the rotor 31 is provided in the bottom surface corresponding portion 36a.
A communication hole 37 corresponding to the coolant passage hole 35 formed through is formed.

The laminated iron core 32 of the rotor 31 and the upper and lower cap-type end members 36, 36 are assembled and coupled to each other by, for example, rivets 38 as fixing members, whereby the rotor 31 A permanent cap (not shown) embedded in the laminated iron core 32 is prevented from popping out during rotation, and a lower cap-type end member disposed on the lower end surface 32b of the laminated iron core 32. 36 has a refrigerant concentration function of concentrating the refrigerant gas discharged from the rotary compression element 10 and the mist-like lubricating oil toward the refrigerant passage hole 35 opening to the lower end surface 32b side of the laminated iron core 32.

Further, between the inner peripheral side surface of the laminated iron core 23 of the stator 22 and the outer peripheral side surface of the laminated iron core 32 of the rotor 31, there is a subtlety that refrigerant gas and mist-like lubricating oil can pass. A large air gap E is formed.

Further, reference numeral 41 in the drawing is a disc-shaped oil separation plate made of a non-magnetic metal material such as brass or bronze, and this oil separation plate 41 is on the side of the upper space 1B serving as the high pressure chamber of the closed container 1. Is mounted on the upper end portion 21a of the crankshaft 21 of the electric element 20 facing the above with a bolt 39, and is arranged so as to be synchronously rotatable so as to be located above the rotor 31. After passing through the refrigerant passage hole 35 of the rotor 31 and the air gap E, the rotor 3
The refrigerant gas and the mist-like lubricating oil from the rotary compression element 10 discharged into the space S between the upper surface of 1 and the lower surface of the oil separation plate 41 are radially dispersed by the centrifugal force due to the rotation of the oil separation plate 41, The stator 22 located on the outer periphery thereof
By spraying and adhering the mist-like lubricating oil to the stator winding 24, the refrigerant gas and the mist-like lubricating oil are separated.

The refrigerant gas thus separated is
The mist-like lubricating oil is discharged to the outside of the machine through the discharge pipe 7, and is returned to the oil sump 4 at the inner bottom portion of the closed container 1 along the stator winding 24 of the stator 22.

Reference numeral 50 in the drawing denotes an accumulator as a gas-liquid separation device connected to the suction pipes 5A and 5B for the refrigerant gas to the rotary compression element 10, and this accumulator 50
Is connected to the downstream side of a refrigeration unit circuit (not shown),
Further, it is fixed to the outer side of the closed container 1 by a mounting member 51 such as a band.

FIGS. 4 to 8 show a second embodiment of the hermetic rotary compressor according to the present invention, in which an upper cap type end disposed on the upper end surface 32a of the laminated iron core 32 of the rotor 31. The member 36 has a structure in which a cap-type oil separator 41 is fitted and held in a covered state, and a refrigerant outlet 42 is provided on the upper peripheral side surface of the oil separator 41. , These upper cap type end members 36
The engagement separation between the oil separation body 41 and the oil separation body 41 is provided by projecting the locking claw 43 on the outer surface of the oil separation body 41, and the locking claw 43 is made to correspond to the side surface of the upper cap type end member 36. It is configured to be engaged with the provided locking hole 36A.

[0025]

As is apparent from the above description, according to the present invention, the rotary compression element is housed in the lower part of the closed container, and the electric element is housed in the upper part of the rotary compression element. , A rotor composed of a laminated iron core having a permanent magnet internally rotatably inserted in the stator and having a crankshaft for driving a rotary compression element mounted on a central shaft portion thereof.
In a hermetically-sealed rotary compressor having a vertically extending coolant passage hole through which a refrigerant gas discharged from a rotary compression element passes in a laminated iron core of the rotor, a flat plate that rotates in synchronization with a crankshaft on an upper portion of the rotor. A disk-shaped oil separation plate is provided, and this oil separation plate separates the mist-like lubricating oil mixed with the refrigerant gas discharged through the refrigerant passage hole formed through the laminated iron core of the rotor. Since the bottom end cylindrical cap-type end member is arranged in communication with the refrigerant passage hole on the lower end surface side of the rotor, the permanent magnet embedded in the laminated iron core pops out when the rotor rotates. Can be prevented.

Moreover, the cap-type end member can be provided with a refrigerant concentrating function of concentrating the refrigerant gas discharged from the rotary compression element toward the refrigerant passage hole opening to the lower end surface side of the laminated iron core. In addition, the mist-like lubricating oil that mixes with the refrigerant gas can be efficiently passed through the refrigerant passage hole, whereby the separation ability of the refrigerant gas and the mist-like lubricating oil can be enhanced, and the conventional fuselage body It is possible to reduce the amount of lubricating oil discharged to the outside.

Further, according to the present invention, the cap-type end member is arranged on the upper end surface side of the rotor so as to communicate with the refrigerant passage hole, so that the fixed winding side of the stator is generated by the centrifugal force generated by the rotation of the oil separation plate. It is possible to prevent the refrigerant gas and the mist-like lubricating oil that are blown toward the air from being blown to the rough winding portion below the fixed winding of the stator on the peripheral side surface of the cap-type end member, and thereby the refrigerant gas is prevented. Since the mist-like lubricating oil is constantly sprayed on the dense winding portion above the fixed winding of the stator, the ability to separate the refrigerant gas and the mist-like lubricating oil can be further enhanced.

Further, in claim 3, since a pair of upper and lower cap type end members are respectively arranged on the upper and lower end surfaces of the laminated iron core of the rotor so as to communicate with the refrigerant passage holes, the upper and lower cap type members are arranged. The end member can double as the conventional end ring, and when the rotor rotates,
It is possible to prevent the permanent magnets embedded in the laminated iron core from popping out, and by doing so, it is possible to reduce the number of components of the rotor and improve the assembly workability.

In addition, a cap-type oil separator is fitted and held in the upper cap-type end member in a covered state, and a refrigerant outlet is provided on the upper peripheral side surface of the oil separator, so that a refrigerant gas is generated. Mist-like lubricating oil
Since it is always blown to the dense winding portion above the fixed winding of the stator, the ability to separate the refrigerant gas and the mist-like lubricating oil can be further enhanced.

Further, according to the present invention, when the oil separating body is fitted and held on the upper cap type end member in the covered state, a locking claw is provided so as to project on the outer surface of the oil separating body. Since the claw is engaged with the locking hole provided corresponding to the side surface of the upper cap type end member, the oil separator can be easily attached and detached and replaced.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing a first embodiment of a hermetic rotary compressor according to the present invention.

FIG. 2 is a bottom view of a lower cap-type end member that is also arranged on the lower end surface of the rotor of the electric element.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view schematically showing a second embodiment of the hermetic rotary compressor according to the present invention.

FIG. 5 is a plan view of an upper cap-type end member that is also arranged on the upper end surface of the rotor of the electric element.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a plan view of an oil separator fitted to an upper cap type end member that is also arranged on the upper end surface of the rotor of the electric element.

8 is a cross-sectional view taken along the line CC of FIG.

FIG. 9 is a schematic sectional view of a conventional hermetic rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airtight container, 1A ... Low pressure side space, 1B ... High pressure side space, 10 ... Rotating compression element, 20 ... Electric element, 21 ... Crank shaft, 22 ... Fixed Child, 31 ... Rotor, 35 ... Refrigerant passage hole, 36, 36 ... Cap type end member, 37 ... Communication hole, 41 ... Oil separation plate, P1, P2 ... Compression Room.

Claims (4)

[Claims] 1. A rotary compression element is housed in a lower part of an airtight container, and an electric element is housed in an upper part of the rotary compression element, and the electric element is rotatably inserted in the stator and A rotor formed of a laminated iron core having a built-in permanent magnet, in which a crankshaft for driving the rotary compression element is mounted on a central shaft portion, and a refrigerant discharged from the rotary compression element to the laminated iron core of the rotor. In a hermetic rotary compressor having a refrigerant passage hole that allows gas to pass therethrough in the vertical direction, a flat disk-shaped oil separation plate that rotates in synchronization with the crankshaft is provided on the rotor, and the oil separation plate is provided. At the same time, the mist-like lubricating oil mixed with the refrigerant gas discharged through the refrigerant passage hole formed through the laminated iron core of the rotor is separated, and the bottomed cylinder is provided on the lower end surface side of the rotor. -Shaped cap-type end member Hermetic rotary compressor, characterized in that was placed in communication with the refrigerant passing hole. 2. The hermetic rotary compressor according to claim 1, wherein the cap-type end member is arranged on the upper end surface side of the rotor so as to communicate with the refrigerant passage hole. 3. A rotary compression element is housed in the lower part of a hermetic container, and an electric element is housed in the upper part of the rotary compression element. The electric element and a stator are rotatably inserted in the stator. A rotor formed of a laminated iron core having a built-in permanent magnet, in which a crankshaft for driving the rotary compression element is mounted on a central shaft portion, and a refrigerant discharged from the rotary compression element to the laminated iron core of the rotor. In a hermetic rotary compressor formed by vertically penetrating a refrigerant passage hole for passing gas, a pair of upper and lower cap-type end members are connected to the refrigerant passage hole on the upper and lower end face sides of the laminated iron core of the rotor. Characterized in that a cap-type oil separator is fitted and held in the upper cap-type end member in a covered state, and a refrigerant outlet is provided on the upper peripheral side surface of the oil separator. Closed rotation pressure Machine. 4. When the oil separation body is fitted and held on the upper cap type end member in a covered state, a locking claw is provided so as to project on an outer surface of the oil separation body, and the locking claw is provided on the upper cap. The hermetic rotary compressor according to claim 3, wherein the hermetically sealed rotary compressor is engaged with a locking hole provided corresponding to a side surface of the mold end member.