JP2001012371A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attempt the simplification of a constitution, minifying and lightening and cost reduction together by constituting a compressor mechanism part and motor part more integrally. SOLUTION: This compressor is provides with a hermetically closed case 2 for storing lubrication oil, a cylindrical cylinder 6 stored in this hermetically closed case 2, a roller 10 stored turnably in this cylinder in such state that its one part is contacted to the inner periphery surface and formed on its outer periphery surface so that the pitch of spiral groove 11 becomes gradually smaller from a fluid suction side toward a fluid delivery side, a spiral blade 12, fitted in this spiral groove protrudingly and readingly, contacting to the cylindrical inner periphery surface of the cylinder, an annular rotor, stored in the roller turnably, for turning this roller in the cylinder and a stator 13 arranged inside this rotor and fixed in the hermetically closed case 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor suitable for a compressor such as a refrigerating cycle device such as an air conditioner or a refrigerating device, and more particularly, to a helical blade type compression mechanism and an electric motor for driving the same. The present invention relates to a compressor that is more integrally configured to reduce the size and weight.

[0002]

2. Description of the Related Art Generally, there are various types of conventional compressors of this type, such as a reciprocating compressor and a rotary compressor. These compressors include a reciprocating compression mechanism or a rotary compression mechanism.
The motor unit for driving the compression mechanism is housed in a closed case.

However, since the electric motors of these compressors are of an inner rotor type in which a rotor is disposed inside a stator, the rotational force of the rotor is transmitted through a transmission mechanism such as an eccentric part of a rotary shaft crank. In many cases, the power is transmitted to the compression mechanism to drive the compression mechanism.

[0004]

However, in such a conventional compressor, the electric motor and the compression mechanism are separately provided, and a transmission mechanism for transmitting the rotational force of the electric motor to the compression mechanism is provided. Therefore, there is a problem that the number of parts is large, the weight is increased, and the number of assembly steps is increased, which leads to an increase in cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to simplify the structure, reduce the size and weight, and reduce the cost by forming the compression mechanism and the electric motor more integrally. An object of the present invention is to provide a compressor that can achieve both the reduction and the reduction.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 comprises an airtight container containing lubricating oil, a cylindrical cylinder housed in the airtight container, And a spiral groove is formed on the outer peripheral surface so that the pitch gradually decreases from the fluid suction side to the fluid discharge side. A roller, a helical blade which is fitted into the helical groove of the roller so as to be freely retractable and comes into contact with the cylindrical inner peripheral surface of the cylinder, and is rotatably housed in the roller, A compressor comprising: an annular rotor that rotates inside the rotor; and a stator that is disposed inside the rotor and fixed in the closed container.

According to a second aspect of the present invention, the rotor is eccentric with respect to the center axis of rotation and slidably contacts the inner peripheral surface of the roller, and the eccentric outer peripheral portion for rotating the roller in the cylinder and the stator. A magnet disposed at a predetermined gap on the inner peripheral surface facing the outer peripheral surface, and a shaft sliding portion rotatably fitted to the center axis of the stator fixed in the closed container,
The compressor according to claim 1, further comprising:

The invention according to claim 3 is the compressor according to claim 1 or 2, further comprising a rotation preventing mechanism for preventing rotation of the roller.

According to a fourth aspect of the present invention, at one end of the stator,
The compressor according to any one of claims 1 to 3, wherein a recess for accommodating one end of the rotor shaft sliding portion is formed around the central axis.

A fifth aspect of the present invention is the compressor according to any one of the first to fourth aspects, wherein the cylinder is fixed to a closed container.

According to a sixth aspect of the present invention, the cylinder is provided with a cylindrical inner peripheral surface slidably in contact with the outer periphery of the blade, and a thrust surface for supporting the thrust surface of the roller. A compressor according to any one of claims 1 to 5.

According to a seventh aspect of the present invention, the stator central shaft and the rotor shaft sliding portion are erected vertically so that the stator and the rotor are vertically arranged, and the lower end of the shaft sliding portion of the rotor is formed. While immersed in the lubricating oil, the lubricating oil is pumped up, and an oil groove for supplying lubricating oil to the outer periphery of the stator central shaft and the sliding portion of the rotor shaft sliding portion is formed on the inner peripheral surface of the rotor shaft sliding portion or the stator central shaft. The compressor according to any one of claims 1 to 6, wherein the compressor is formed on an outer peripheral surface of the compressor.

According to an eighth aspect of the present invention, the rollers are vertically arranged such that one end on the suction side having a large pitch of the spiral groove is located below the other end on the discharge side. 7. The compressor according to 7.

According to a ninth aspect of the present invention, an oil passage for guiding the oil supplied to the shaft sliding portion of the rotor to the outer circumferential sliding portion of the rotor is formed in the rotor.
The compressor according to any one of the above.

According to a tenth aspect of the present invention, there is provided the compressor according to any one of the first to ninth aspects, wherein a rolling bearing is provided between the outer peripheral eccentric portion of the rotor and the inner peripheral surface of the roller. .

According to the first to tenth aspects of the present invention, the eccentric outer peripheral portion of the rotor, which rotates when the stator is energized, is eccentrically rotated in the roller, so that the roller is directly driven to rotate by the rotor. The power transmission mechanism can be omitted as compared with a case where the roller is turned through a power transmission mechanism such as a crank portion of a rotating shaft. For this reason, it is possible to both simplify the configuration of the compressor as a whole and reduce the number of parts, and to improve the transmission efficiency of the rotational force transmitted from the rotor to the rollers. For this reason, since the compression capacity can be improved, the size and weight of the compressor can be further reduced.

According to the second aspect of the present invention, the magnet is provided on the inner peripheral surface of the rotor opposed to the outer peripheral surface of the stator, and the eccentric outer peripheral portion is integrally coupled to the outer periphery of the rotor. Since the shaft sliding portion is externally fitted to the center axis of the stator, the axial length is shorter than when the rotor shaft sliding portion and the stator center axis are juxtaposed along the axial direction. Can be hidden.

According to the third aspect of the present invention, since the rotation of the roller can be prevented by the rotation preventing mechanism, the compression efficiency can be improved.

According to the fourth aspect of the present invention, an annular concave portion is formed at one end of the stator for accommodating one end of the shaft sliding portion of the rotor rotatably fitted to the outer periphery of the center shaft. As a result, the axial length from one end of the stator to the rotor shaft sliding portion can be shortened, and the shaft length of the rotor shaft sliding portion can be increased. Can be achieved.

According to the fifth aspect of the present invention, since the cylinder is fixed to the closed container, the supporting force of the cylinder can be increased. For this reason, the rotation of the roller in the cylinder can be stabilized.

According to the sixth aspect of the present invention, since both the radial surface and the thrust surface of the roller are supported by the cylinder fixed in the closed container, the rotation of the roller in the cylinder can be stabilized.

According to the seventh aspect of the present invention, when the rotor rotates, the lower end of the rotor shaft sliding portion immersed in the lubricating oil in the closed container rotates, so that the inner periphery of the shaft sliding portion is rotated. Oil grooves formed on the surface or outer peripheral surface of the stator center shaft
Lubricating oil in the sealed container is pumped up and supplied to the sliding portion between the rotor shaft sliding portion and the stator center shaft, so that the sliding loss of these sliding portions can be reduced.

According to the eighth aspect of the present invention, since the roller is pushed toward the thrust surface of the cylinder due to the pressure difference, the sealing performance between the thrust surface of the roller and the thrust surface of the cylinder can be improved.

According to the ninth aspect of the present invention, the rotation of the shaft sliding portion of the rotor causes the oil groove in the shaft sliding portion to pump up the lubricating oil in the sealed container, and the shaft sliding portion and the stator Oil is supplied to a sliding portion with the central shaft, and further from this sliding portion to an outer peripheral sliding portion of the rotor through an oil passage, so that sliding loss can be reduced.

According to the tenth aspect of the present invention, since the outer eccentric portion of the rotor slides on the inner peripheral surface of the roller via the rolling bearing, the sliding loss can be reduced.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In these figures, the same or corresponding parts are denoted by the same reference characters.

FIG. 1 is a longitudinal sectional view of a compressor 1 according to a first embodiment of the present invention. In FIG. 1, a compressor 1 integrally includes a helical blade type compression mechanism 3 and an electric motor 4 of an outer rotor type electric motor that drives the compression mechanism 3 in a sealed case 2 which is a sealed container. And then housed in an airtight manner.

The closed case 2 is a lower case 2 having a bottomed cylindrical shape.
The upper end of the opening a is fixed to the lower end of the opening of the closed cylindrical upper case 2b by welding or the like to form a closed container.
An oil reservoir 5 for storing a required amount of lubricating oil is formed on the inner bottom of the closed case 2.

The compression mechanism 3 accommodates a cylindrical cylinder 6 disposed vertically in the closed case 2 so that the center axis thereof extends along the vertical direction. An annular bottom 6a is formed integrally, and an outward flange 7 is integrally provided on the outer peripheral surface of the bottom 6a.
Is fixed to the inner peripheral surface of the closed case 2 in close contact. On the other hand, a disk-shaped central shaft thrust portion 8 which is a thrust receiving member for closing the center hole is attached to the center of the annular bottom portion 6a, and the central shaft thrust portion 8 penetrates in the thickness direction. A plurality of oil holes 8a are formed.

The end of the suction pipe 9 is fixed to the side surface of the lower end portion in FIG. 1 of the closed case 2 in a state where the tip of the suction pipe 9 is penetrated. In this state, it is fixed to the side surface of the lower end of the cylinder 6. That is, the lower end of the cylinder 6 is formed at the suction-side end where the fluid such as the refrigerant is sucked from the suction pipe 9.

An annular roller 10 is accommodated in the cylinder 6 so as to freely rotate (revolve), and the lower end of the roller 10 in FIG. 1 is fixed by a thrust surface 6b on the inner surface of the lower end of the cylinder 6 in FIG. It is pivotably supported. Further, a predetermined spiral groove 11 is formed on the outer peripheral surface of the roller 10 so that the pitch gradually decreases from the suction side end at the lower end in FIG. 1 to the discharge side end at the upper end. A spiral helical blade 12 having elasticity is fitted in the spiral groove 11 so as to be able to protrude and retract.

The helical blade 12 is formed of an elastic material, plastics, fluororesin such as Teflon, or fluoroplastics. The helical blade 12 is hermetically contacted with the inner peripheral surface of the cylinder 6, and partitions the annular gap between the inner peripheral surface of the cylinder 6 and the outer peripheral surface of the roller 10 into a plurality of working chambers along the axial direction by the helical blade 12. I have. Each working chamber is defined between two adjacent turns of the helical blade 12 and extends from the contact portion between the inner peripheral surface of the cylinder 6 and the outer peripheral surface of the roller 10 along the helical blade 12 to the next contact portion. It is almost crescent-shaped. Each volume of these working chambers gradually decreases from the suction side at the lower end in FIG. 1 to the discharge side at the upper end in FIG. 1 corresponding to the pitch of the helical blade 12.

Inside the roller 10, an outer rotor type motor section 4 is disposed. That is, the electric motor unit 4 is provided with a stator 13 inside the roller 10 and a bottomed cylindrical rotor 14 fitted on the outer peripheral surface of the stator 13 with a predetermined gap therebetween. The lower end of the central shaft 15 of the stator 13 is fixed on the central shaft thrust portion 8. The stator 13 is electrically connected to a connection terminal 16 via a lead wire at an end of the winding, and the connection terminal 16 is electrically connected to an inner end of an external electric terminal 17 mounted on the sealed case 2. ing.

The rotor 14 is formed integrally or integrally with an annular portion 14a housed in the roller 10 and a bottom portion 14b closing one end of the annular portion 14a.
The rotor magnet 18 is disposed in a ring shape on the inner peripheral surface of a, and the gap between the rotor magnet 18 and the outer peripheral surface of the stator 13 is set at a predetermined interval.

On the other hand, the bottom portion 14b of the rotor 14 has a rotor shaft sliding portion 19, which is a cylindrical rotary cylinder, integrally or integrally protruding at the center thereof. The rotor shaft sliding portion 19 protrudes from the rotor bottom portion 14b on both the inner and outer sides in the axial direction so as to be rotatably fitted on the outer periphery of the stator center shaft 15. The lower end of the rotor shaft sliding portion 19 in the axial direction is the center shaft thrust portion 8 It is slidably abutted on and stands upright. That is, the shaft sliding portion 1 which is a rotating cylinder of the stator center shaft 15 and the rotor 14
9 are erected along the vertical direction, and the electric motor unit 4 is configured to be vertical.

The upper half of the rotor shaft sliding portion 19 above the rotor bottom portion 14b in FIG. 1 is an annular recess 13a formed on the outer periphery of the stator center shaft 15 at the lower end of the stator 13.
It is inserted with play inside. A helical oil groove 20 is formed on at least one of the inner peripheral surface of the rotor shaft sliding portion 19 and the lower outer peripheral surface of the stator center shaft 15, and the rotation of the rotor shaft sliding portion 19 causes the central shaft thrust portion 8 to rotate. The oil pump pumps up the lubricating oil in the oil reservoir 5 from the oil hole 8a and supplies it to the sliding portion between the stator center shaft 15 and the shaft sliding portion 19 through the oil groove 20.

The oil groove 2 is provided in the rotor bottom 14b.
0, open to the outer peripheral surface of the annular portion 14a, and form an oil passage 21 for supplying oil to the outer peripheral surface of the annular portion 14a. Further, an oil supply groove 22 communicating with the oil passage 21 is connected to the rotor annular portion. It is formed on the outer peripheral surface of the roller 14a so as to supply oil to a sliding portion with the inner peripheral surface of the roller 10.

On the outer peripheral surface of the rotor annular portion 14a, the outer eccentric portion 1 is eccentric with respect to the rotation center axis O of the rotor 14 by a predetermined amount and slidably contacts the inner peripheral surface of the roller 10.
The roller 10 is rotated (revolved) in the cylinder 6 by eccentric rotation of the rotor outer eccentric portion 14c.

Since the rotor outer eccentric portion 14c rotates inside the roller 10 in a state of contact with the inner peripheral surface thereof, the frictional force of the contact portion also rotates the roller 10 itself to reduce the compression efficiency. There are cases.

Therefore, a rotation preventing mechanism is provided for engaging one end (lower end in FIG. 1) of the roller 10 with the inner surface of the cylinder bottom 6a through an Oldham mechanism (joint) 23 to prevent the rotation of the rotor 10 itself. Thus, a decrease in compression efficiency is prevented.

A discharge pipe 24 is mounted above the suction pipe 9, for example, on one side of the sealed case 2.
An inner open end of the discharge pipe 24 is opened near a discharge-side open end (the upper end in FIG. 1) in the cylinder 6, and the refrigerant or the like discharged into the sealed case 2 from the discharge-side open end of the cylinder 6. The compressed fluid is discharged from the discharge pipe 24 to a refrigeration cycle device or the like.

Next, the operation of the compressor 1 will be described.

First, when the rotor 14 is rotated by energization of the stator 13 of the motor unit 4, the outer eccentric portion 14c of the rotor 14 eccentrically rotates while slidably contacting the inner peripheral surface of the annular roller 10. .

For this reason, the roller 10 rotates (revolves) in the cylinder 6, and slides and rotates while the outer peripheral surface of the helical blade 12 is in contact with the inscribed surface of the cylinder 6. At this time, the rotation of the roller 10 is prevented because the roller 10 is engaged with the cylinder 6 by the Oldham mechanism 23. Thereby, each part of the helical blade 12 is largely pushed into the spiral groove 11 as it approaches the contact portion between the outer peripheral surface of the roller 10 and the inner peripheral surface of the cylinder 6, while, as it separates, the outer radial direction from this contact portion Increase the amount of protrusion.

Thus, the fluid such as the refrigerant from the suction pipe 9 is supplied to the adjacent helical blades 12 on the suction side of the cylinder 6.
Are sequentially sucked into the working chamber between the windings, compressed while being sequentially transferred to the discharge port side, and then temporarily discharged into the sealed case 2 from the discharge port at the upper end opening of the cylinder 6, and then externally frozen from the discharge pipe 24. Discharged in a cycle or the like.

When the shaft sliding portion 19 of the rotor 14 rotates, the lubricating oil in the oil sump 5 is discharged by the oil hole 8a by the pumping action of the rotation of the oil groove 20 of the shaft sliding portion 19.
Through the oil groove 20 and the stator center shaft 1
5 and the rotor shaft sliding portion 19 are supplied with oil, and furthermore, the oil passage 21 in the rotor bottom portion 14b and the rotor annular portion 14
a The oil is supplied to the sliding portion between the outer peripheral surface of the rotor annular portion 14 and the inner peripheral surface of the roller 10 through the oil supply groove 22 on the outer peripheral surface, so that the sliding loss of these sliding portions can be reduced.

When the eccentric outer peripheral portion 14c of the rotor 14 rotates within the roller 10, the roller 10 can be directly driven to rotate by the rotor 14, so that
In the case where the roller 10 is turned through the transmission mechanism such as the crank portion of the rotation shaft by the rotation force of the rotor 14, the transmission mechanism can be omitted. Therefore, the structure of the compressor 1 as a whole can be simplified and the number of parts can be reduced, and the transmission efficiency of the rotational force transmitted from the rotor 14 to the roller 10 can be improved. For this reason, the size and weight of the compressor 1 can be further reduced.

Further, a magnet 18 is provided on the inner peripheral surface of the rotor 14 facing the outer peripheral surface of the stator 13, and an eccentric outer peripheral portion 14 c is integrally formed on the outer periphery of the rotor 14.
Since the shaft sliding portion 19, which is a rotating cylinder of the rotor 14, is externally fitted to the stator center shaft 15, the size and weight of the rotor 14 itself can be reduced.

Further, the roller 1 is driven by the Oldham mechanism 23.
Since zero rotation can be prevented, the compression efficiency can be improved.

An annular recess 13a is provided at the lower end around the center axis 15 of the stator for accommodating the upper end of a rotor shaft sliding section 19 rotatably fitted on the outer periphery of the center axis 15.
Is formed, it is possible to increase the axial length of the axial sliding portion 19 of the rotor while suppressing an increase in the axial length of the rotor 14 itself. Thereby, the rotation of the rotor 14 can be stabilized.

FIG. 2 is a longitudinal section of a compressor 1A according to a second embodiment of the present invention. This compressor 1A
Removes the oil passage 21 of the rotor bottom portion 14b and the oil supply groove 22 of the outer peripheral surface of the rotor annular portion 14a in the compressor 1 while the outer peripheral surface of the outer eccentric portion 14c of the rotor 14 and the inner peripheral surface of the roller 10 are removed. Rolling bearings 25 are interposed at the upper and lower ends between them to reduce the sliding loss of these sliding parts. The other configuration is the same as the configuration of the compressor 1 described above.

[0052]

As described above, according to the present invention, since the roller of the compression mechanism is directly driven to rotate by the rotor of the electric motor, the rotational force of the rotor is transmitted to the roller via a transmission mechanism such as a crank of the rotary shaft. The transmission mechanism can be omitted as compared with the case of turning. For this reason, it is possible to both simplify the configuration of the compressor as a whole and reduce the number of parts, and to improve the transmission efficiency of the rotational force transmitted from the rotor to the rollers. For this,
It is possible to further reduce the size and weight of the compressor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a compressor according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a compressor according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Compressor 2 Hermetic case 3 Helical blade type compression mechanism part 4 Electric motor part 6 Cylinder 10 Roller 11 Helical groove 12 Helical blade 13 Stator 14 Rotor 14a Rotor annular part 14b Rotor bottom part 14c Rotor peripheral eccentric part 18 Rotor magnet 19 Rotor shaft sliding Moving part 20 Oil groove 21 Oil passage 22 Oil supply groove 23 Oldham mechanism

Claims (10)

[Claims] An airtight container containing lubricating oil, a cylindrical cylinder housed in the airtight container, and a swivel housed in the cylinder with a part of its inner peripheral surface in contact with the cylinder. A roller in which a spiral groove is formed on the outer peripheral surface so that the pitch gradually decreases from the fluid suction side to the fluid discharge side; A helical blade that is in contact with the cylindrical inner peripheral surface of the cylinder, an annular rotor that is rotatably housed in the roller and rotates the roller in the cylinder, and that is disposed inside the rotor, A stator fixed in a closed container. 2. The rotor is eccentric with respect to its rotation center axis and slidably contacts an inner peripheral surface of a roller, and opposes an eccentric outer peripheral portion for rotating the roller in a cylinder and an outer peripheral surface of a stator. It is characterized by comprising a magnet disposed at a predetermined gap on the inner peripheral surface, and a shaft sliding portion rotatably fitted to the center axis of the stator fixed in the sealed container. The compressor according to claim 1. 3. The compressor according to claim 1, further comprising a rotation preventing mechanism for preventing rotation of the roller. 4. The stator according to claim 1, wherein a recess for accommodating one end of the rotor shaft sliding portion is formed at one end of the stator around the central axis. compressor. 5. The compressor according to claim 1, wherein the cylinder is fixed to a closed container. 6. The cylinder according to claim 1, wherein the cylinder has a cylindrical inner peripheral surface slidably in contact with an outer periphery of the blade, and a thrust surface for supporting a thrust surface of the roller. A compressor according to any one of the preceding claims. 7. A stator and a rotor are vertically arranged with a stator center shaft and a rotor shaft sliding portion arranged vertically, and a lower end of the shaft sliding portion of the rotor is immersed in lubricating oil. On the other hand, an oil groove is formed on the inner peripheral surface of the rotor shaft sliding portion or the outer peripheral surface of the stator central shaft for pumping up the lubricating oil and supplying lubricating oil to the outer periphery of the stator central shaft and the sliding portion of the rotor shaft sliding portion. The compressor according to any one of claims 1 to 6, wherein: 8. The compressor according to claim 7, wherein the rollers are vertically arranged such that one end on the suction side having a large pitch of the spiral groove is located below the other end on the discharge side. 9. The rotor according to claim 7, wherein an oil passage for guiding the oil supplied to the shaft sliding portion of the rotor to the outer peripheral sliding portion of the rotor is formed in the rotor. The described compressor. 10. The compressor according to claim 1, wherein a rolling bearing is provided between an outer eccentric portion of the rotor and an inner peripheral surface of the roller.