JPH11324957A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an electric compressor by forming a compression chamber by a cylinder inner face, a fixed rotor and a partitioning vane in a rotor of an electric motor. SOLUTION: In an electric compressor, when a rotor 21 is rotated, the discharging is performed twice per one rotation in the left and right compression chambers. That is, the discharging is performed twice per one rotation of the rotor 1. On this occasion, both chambers perform the suction, compression and discharging cycles in a state that they are shifted from one another by 180 degrees. Further in the electric compressor, all the elements forming a compressing mechanism such as a cylinder 8, a fixed rotor 15, a partitioning vane 31 or the like is accommodated in the rotor 21 of an electric motor 10. Thereby the electric compressor can be made compact without elongated in the axial direction of the electric motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor used for a home or vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, in this type of electric compressor,
The mechanical part of the compressor and the electric motor were connected in series by a shaft. For this reason, there is a problem that the electric compressor becomes longer in the motor axis direction. In particular, when the compressor is hermetically sealed, the electric motor and the mechanical part of the compressor are housed in a hermetically sealed container, so that there is a problem that the hermetically sealed container becomes large, and the installation space and weight increase. .
To solve such a problem, Japanese Patent Laid-Open No. 2-30 / 1990
There is one described in Japanese Patent No. 5380. In this conventional technique, a stator of a motor is fixed to an inner surface of a casing, a rotor of the motor is rotatably supported on a casing via a main shaft, and a piston is reciprocated at a predetermined distance from an end face of the rotor. A swash plate is provided as a motion transmitting mechanism for moving. A plurality of cylinders and pistons that are inclined in the centrifugal direction toward the swash plate with respect to the main shaft are arranged on a fixed circumference in the rotor of the motor. However, in this conventional technique, since a plurality of pistons are arranged on a certain circumference, the diameter of the rotor increases, and a swash plate as a motion transmission mechanism is arranged outside the rotor. Therefore, the length direction is long, and there is still room for improvement.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems existing in the prior art. It is an object of the present invention to provide a compact electric compressor by incorporating a compression mechanism in a rotor of an electric motor.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an electric motor having a sealed container, a stator, a rotor, and the like built in the sealed container.
Within the rotor, a cylinder having a circular cross section formed so as to be eccentric and parallel to the rotation axis of the rotor, and to have the same axis as the rotation axis of the rotor. A fixed rotor having a circular cross section and fixed to the closed container and disposed in the cylinder; and a resiliently extendable and retractable extension from the fixed rotor such that a tip portion is pressed against an inner surface of the cylinder. And a partition vane extending over the entire length in the axial direction of the fixed rotor,
The inner diameter of the cylinder, the eccentric distance of the cylinder and the outer diameter of the fixed rotor are determined such that the outer peripheral surface of the fixed rotor contacts a part of the inner peripheral surface of the rotor, and the contact portion of the fixed rotor is A suction port that opens into the cylinder from the inner peripheral surface of the cylinder is disposed at a portion immediately behind the rear side in the rotation direction, and further, a fixed wall surface that closes an axial end surface of the cylinder with respect to the rotation direction of the partition vane. A discharge port that opens into the cylinder near the outer periphery of the fixed rotor is disposed in the rear portion, and a discharge valve is disposed in the discharge port, and the cylinder inner surface, the fixed rotor, and the partition vane are disposed. The compression chamber is formed by the following.

According to a second aspect of the present invention, in the first aspect of the present invention, the partition vanes comprise two partition vanes symmetrically arranged with respect to an axis of the fixed rotor. And a discharge valve is provided for each partition vane.

According to the third aspect of the present invention, the circular cylinder having a circular cross section is a cylinder having an elliptical or elliptical cross section formed so as to have the same axis as the rotation axis of the rotor. A plurality of the partition vanes,
The outer diameter of the fixed rotor and the minor axis of the cylinder are substantially the same size, and the outer peripheral surface of the stationary rotor is configured to contact both inner surfaces of the minor diameter portion formed at symmetrical positions of the cylinder, A suction port that opens into the cylinder from the inner peripheral surface of the cylinder is provided at a portion immediately rearward of the fixed rotor in the rotation direction of each contact portion, and further, a fixed wall surface that closes an axial end surface of the cylinder. A discharge port that opens into a cylinder near the outer periphery of the fixed rotor, and a discharge valve is disposed at each discharge port, at a position immediately behind the partition vane in the rotation direction of the partition vane; A compression chamber is formed by an inner surface, the fixed rotor, and the partition vane.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the partition vanes are formed from two or four partition vanes radially arranged at regular intervals around the axis of the fixed rotor. It is characterized by becoming.

[0008] The invention according to claim 5 is characterized in that carbon dioxide is used as a refrigerant.

Therefore, claim 1 configured as described above.
In the electric compressor described, the rotation of the rotor of the electric motor causes the suction port to rotate together with the rotor. In the cylinder, a compression chamber formed between the fixed rotor and the inner surface of the cylinder is provided after a partition vane where a contact portion between the fixed rotor and the inner surface of the cylinder (hereinafter referred to as a fixed rotor seal portion or simply a seal portion) approaches. Side, ie
Between the seal portion and the partition vane on the front side of the seal portion, the compression chamber is reduced as the seal portion approaches the partition vane, and a compression action is performed. Further, since the compression chamber is connected to the discharge valve via the discharge port, discharge is performed when the refrigerant gas in the compression chamber reaches a predetermined pressure due to the contraction of the compression chamber. On the other hand, between the seal portion and the partition vane on the rear side of the seal portion, suction is performed because the compression chamber is expanded and communicates with the suction port.

Therefore, since the discharge is performed each time the seal portion approaches the partition vane, if the number of the partition vanes is one, the compression is performed once every rotation of the rotor. Like an electric compressor, when two partition vanes are arranged symmetrically with respect to the axis of a fixed rotor, that is, linearly arranged, in two compression chambers partitioned by the two partition vanes, The above-described compression and suction are performed, respectively. For this reason, each time the rotor makes one rotation, it is discharged twice. In the compression chamber located between the two partition vanes, the volume is reduced and compression is performed. In this way, the cylinder formed as an eccentric hole is efficiently used as a compression chamber, and the discharge volume can be increased without increasing the outer shape of the electric compressor.

Further, in the electric compressor according to the first and second aspects, since the compression mechanism is completely integrated in the electric motor, the space is reduced and the weight is reduced. In the field of compressors for vehicle air conditioners, the number of rotations of an electric compressor is about 3 to more than that of an engine driven compressor.
Since the cylinder volume is increased by about 10 times, the cylinder volume may be small, and it is easy to adopt such a configuration.

In the electric compressor according to the third aspect, similarly to the electric compressor according to the first aspect, the compression chamber formed between the seal portion and the partition vane at the front side of the seal portion of the fixed rotor is provided. As the seal portion approaches the partition vane, the seal portion is contracted to perform a compression action. Further, the discharge is performed when the refrigerant gas in the compression chamber reaches a predetermined pressure.
On the other hand, the compression chamber formed between the seal portion and the partition vane on the rear side of the seal portion is enlarged and communicates with the suction port, so that suction is performed. Further, since the cylinder has an elliptical shape or an elliptical shape and is disposed coaxially with the fixed rotor, seal portions are formed at two symmetrical positions. Is doubled. Therefore, the cylinder is more efficiently utilized as a compression chamber, and the discharge volume can be further increased without increasing the outer shape of the electric compressor.

In the electric compressor according to the third aspect, the number of the partition vanes may be an odd number. However, as in the case of the electric compressor according to the fourth aspect, if the partition vanes are arranged at equal intervals as two or four even numbers. , Suction at a symmetrical position sandwiching the rotation axis,
Since compression and discharge are performed, the load balance is balanced,
Vibration and noise are reduced. For example, when four partition vanes are radially arranged at equal intervals as in the electric compressor according to the fourth aspect, the rear side of the partition vanes to which each seal portion (in this case, two locations) approaches, that is, the seal portion is provided. Since the compression chamber formed between the seal portion and the partition vane on the front side is reduced and communicated with the discharge valve via the discharge port,
Discharge is performed when the refrigerant pressure in the compression chamber becomes equal to or higher than a predetermined pressure. Further, the compression chamber formed between the seal portion and the partition vane on the rear side of the seal portion is enlarged and communicates with the suction port, so that suction is performed. Also,
Since the compression chambers located between the partition vanes are hermetically closed and reduced, a compression action is performed. As a result, inhalation,
Compression and discharge are performed symmetrically with respect to the rotor with respect to the axis. In addition, since discharge is performed each time each seal portion approaches each partition vane, discharge is performed eight times each time the rotor makes one rotation.

In the electric compressor according to the fifth aspect, since carbon dioxide is used as the refrigerant, the volume of the refrigerant is extremely small as compared with the case where a CFC-based refrigerant is used. This is about one fifth of the case where R134a is used as the system refrigerant. Therefore, in the present electric compressor, the cylinder volume becomes smaller, and it becomes easier to employ the above-described configuration for the rotor of the electric motor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a vehicle air conditioner will be described in detail with reference to FIGS. In FIG. 1, the left side is the front part and the right side is the rear part for convenience of explanation.

FIG. 1 is a longitudinal sectional view of the electric compressor according to the first embodiment, and FIG. 2 is a sectional view taken along the line II-II. In these figures, reference numeral 1 denotes a closed container having a pressure-resistant structure. The closed container 1 includes a cup-shaped container body 2 having a circular cross section and a lid 3 for hermetically sealing the open end of the container body 2. . 4 is an O-ring. At the center of the side wall 2a of the container body 2, there is a cylindrical bulge 2b bulging forward in the axial direction, and a through hole is formed in the center of the bulge 2b as a discharge port 6. I have. A shallow bowl-shaped discharge casing 7 is fixed to the front surface of the bulging portion 2b by a plurality of screws 5 so as to cover the discharge port 6. A fixed rotor 15 that forms a rotating shaft of the electric motor 10 described later protrudes from the front surface of the discharge casing 7. The fixed rotor 15 may be formed integrally with the discharge casing 7, or may be formed as a separate body and connected and fixed. O-rings 7a and 7b provided in connection with the above configuration are sealing O-rings.

The electric motor 10 comprises a stator 11 and a rotor 2
And 1. The stator 11 is press-fitted and fixed to the inner peripheral surface of the container body 2. And this stator 11
Are connected to a power supply via a power supply terminal 12 attached to the cover plate 3. The rotor 21 includes a rear rotor 21b and a front rotor 21a, and both are connected by appropriate means such as bolts. Front rotor 21a
Radial bearing 22 between the fixed rotor 15 and
Are arranged. A cylindrical concave portion 24 is formed at the rear end of the rear rotor 21b, and the bottom surface of the concave portion 24 is brought into contact with the front surface of the discharge casing 7, and further the concave portion 2 is formed.
A radial bearing 23 is disposed between the cylindrical inner peripheral surface of No. 4 and the outer peripheral periphery of the discharge casing 7. Also, at the front of the radial bearing 22 at the center of the front rotor 21a,
A thrust bearing 27 is provided, and a coil spring 29 is interposed between the thrust bearing 27 and the cover plate 3. The coil spring 29 presses the rotor 21 rearward through the thrust bearing 27. The rotor 21 is supported as described above, and is rotatably supported on the same axis as the fixed rotor 15.

At the center of the rear rotor 21b, a cylindrical cylinder 8 is bored. The cylinder 8 is eccentric with the center of the fixed rotor 15, and the eccentric distance, the hole diameter of the cylinder 8, and the outer diameter of the fixed rotor 15 are such that the outer peripheral surface of the fixed rotor 15 is The seal portion 30 is configured to contact a part of the inner peripheral surface and to seal the front and rear portions in the rotational direction with lubricating oil interposed by the contact. The front part of the cylinder 8 is closed by the rear surface of the front rotor 21a, and the rear part of the cylinder 8 is closed by the front surface of the discharge casing 7. As can be understood from FIGS. 2, 4 and 5, a fixed rotor 1 is provided at a portion of the fixed rotor 15 located in the cylinder 8.
5 has two partition vanes 31 accommodated in a vane groove 32 so as to be slidable in the radial direction. These partition vanes 31 have a length extending over the entire length in the cylinder 8. The fixed rotor 15 between the opposed end faces of the two partition vanes 31 is provided with a spring insertion hole communicating with the vane groove 32 at a plurality of locations.
3 are stored respectively. And this coil spring 3
The distal end surface of the partition vane 31 is pressed against the inner peripheral surface of the cylinder 8 by 3 to seal the front and rear of the partition vane 31 in the rotation direction.

Reference numeral 35 denotes a suction port, one end of which is opened at the rear side of the seal portion 30 of the cylinder 8 in the direction of rotation of the rotor 21 (the direction of the arrow in FIGS. 2 and 4A). The other end is open to the front of the front rotor 21a and communicates with the inside of the sealed container 1. The inside of the closed container 1 is connected to a suction side of an external refrigerant circuit (not shown) through a suction port 34 formed in the lid 3 and is filled with suction gas. The suction port 35 includes a through hole 35a formed in the front rotor 21a and a groove 35b formed in the front end face of the rear rotor 21b.
The processing of the concave groove 35b is performed before connecting the front rotor 21a and the rear rotor 21b, thereby facilitating the processing.

Reference numeral 36 denotes a discharge port formed on the side wall of the discharge casing 7, one end of which is open to the rear side (rear side with respect to the rotation direction of the rotor 21) of the partition vane 31, and the other end thereof. Discharge chamber 39 formed in 7
Open inside. Each of the discharge ports 36 is provided with a discharge valve 37 provided with a retainer 38. The discharge chamber 39 is connected to the discharge side of an external refrigerant circuit (not shown) via the discharge port 6.

Next, the electric compressor configured as described above will be described mainly with reference to FIGS.
FIG. 4 and FIG. 5 are cross-sectional views showing the principle of the cylinder part.
In FIGS. 4 and 5A to 5H, the rotor 21 is
The state change rotated by 5 degrees is shown. Note that, in these drawings, the arrows indicating the rotation directions of the coil spring 33, the vane groove 32, and the rotor 21 are shown only in FIG. 4A, and are omitted in other drawings. The electric motor 10 is connected to the terminal 12
When the rotor 21 is connected to the power supply via the, the rotor 21 rotates in the direction of the arrow in FIG. In FIGS. 4A and 4B, the right compression chamber C11 of the two partition vanes 31 in FIGS. 4 and 5 is the same as the compression chamber C11b in the discharge step located in front of the seal portion 30 of the fixed rotor 15. It is divided into a compression chamber C11a in the suction process located on the rear side. In the compression chamber C11, the portion of C11a expands to FIG. 4C, and the suction process is continued. 4 (d) to FIG. 5 (g), the portion of C11a is one compression chamber C11.
Thus, the compression action is performed. Also, the rotor 21 is 31
When the position rotated by 5 degrees reaches FIG. 5 (h), the compression chamber C1
1a is divided by the seal portion 30. In this state, the compression chamber C11b on the front side of the seal portion 30 is moved to the position shown in FIG.
Although the compression chamber changes continuously from (g), in the compression chamber C11b, the pressure of the refrigerant exceeds a predetermined pressure, and the discharge action is performed. Also, the compression chamber C11 on the rear side of the seal portion 30
At a, a new inhalation action is performed. In this way,
When the rotor 21 makes one rotation, the state returns to the state shown in FIG.

On the other hand, as is clear from FIGS. 4 and 5,
In the compression chamber C12 on the left side in FIGS. 4 and 5 of the partition vane 31, an operation symmetrical to the compression chamber C11 is performed.
That is, the state of FIG. 4A for the compression chamber C12 is the same as the state of FIG. 5E for the compression chamber C11,
The suction, compression, and discharge cycles are performed with the two compression chambers C11 and C12 shifted by 180 degrees.

Therefore, in the first embodiment, when the rotor 21 makes one rotation, the left and right compression chambers C11 and C1
In step 2, ejection is performed once. That is, discharge is performed twice per rotation of the rotor 21. Further, in the electric compressor according to the first embodiment, since all components constituting the compression mechanism, such as the cylinder 8, the fixed rotor 15, and the partition vane 31, are housed in the rotor 21 of the electric motor 10, The compressor is compactly configured without being elongated in the axial direction of the electric motor 10. The refrigerant used in the electric compressor according to the present embodiment is intended for various refrigerants such as Freon gas such as R134a. When carbon dioxide is used, the discharge pressure and the suction pressure are increased, but the density is reduced. Since the height is high, the cylinder can be made extremely small and small in volume, and a compact configuration can be easily achieved.

Next, a second embodiment will be described with reference to FIG. In the second embodiment, two partition vanes 31 in the first embodiment are used as one, and the other configuration is basically the same as that of the first embodiment. FIG. 6 is a principle cross-sectional view similar to FIGS. 4 and 5, but shows the configuration of the changed part in this drawing. Further, a state change accompanying the rotation of the rotor 21 will be described with reference to FIG. FIG. 6 shows a state in which the rotor 21 is rotated by 90 degrees. In addition, the same reference numerals are given to the same elements and parts as those described in the preceding drawings in the reference numerals shown in FIG. 6, and the description thereof will be simplified. FIG.
6A to 6D, the arrows indicating the rotation directions of the coil spring 33, the vane grooves 32, and the rotor 21 are shown only in FIG. 6A, and are omitted in other drawings.

As shown in FIG. 6A, in the second embodiment, there is basically one compression chamber C2. FIG. 6A shows a state where the compression chamber C2 is at the final position in the suction process. This compression chamber C2 is shown in FIGS.
As shown in (d), the compression chamber C2a formed between the seal portion 30 of the fixed rotor 15 and the partition vane 31 behind the seal portion 30 and the partition vane 31 at the front side of the seal portion 30. It is divided into a compression chamber C2b formed therebetween. Then, the compression chamber C2a is configured as shown in FIGS.
(D) is in the inhalation step. On the other hand, the compression chamber C2b
The compression action is performed in (b) and (c), and as shown in FIG. 6 (d), the internal refrigerant pressure reaches a predetermined pressure, and the discharge action is performed.

In the second embodiment, since the number of partition vanes 31 is one, the structure is simple. However, in the case of the first embodiment, the cylinder 8
Can be used efficiently as a compression chamber, and the discharge capacity can be increased. Therefore, in the case of the first embodiment, the cost is reduced and the size is reduced as compared with the second embodiment.

Next, a third embodiment will be described with reference to FIGS.
It will be described based on. 7 to 9 are cross-sectional views similar to FIG. 4 and FIG.
The state rotated by degrees is shown over time. In addition, the points represented by P in these drawings are merely explanatory symbols for identifying the rotation angle, and have nothing to do with the structure of the electric compressor of the present embodiment. In these drawings, the same elements and components as those described in the previous drawings are denoted by the same reference numerals, and description thereof will be simplified. Note that the coil spring 33 is shown only in FIG. 7A, and is omitted in other drawings.

In the third embodiment, as can be seen from FIGS. 7 to 9, the cylinder 8 in the above embodiment is replaced by a cylinder 308 having an elliptical cross section, and the partition vane 31 in the second embodiment is replaced by a cylinder 308. 4 radially (crossroads)
Are arranged. Further, the diameter of the fixed rotor 15 and the short diameter of the cylinder 308 are made substantially the same, and the fixed rotor 15 is brought into contact with the short diameter portion of the cylinder 308, and this is used as a seal portion 30 to seal the front and rear portions. Therefore, the seal portions 30 are formed at two symmetrical positions, and the suction ports 35 are respectively formed immediately near the rear side of the seal portions 30. Further, the discharge port 36 is connected to each partition vane 3.
1 are formed immediately near the rear side. The above configuration is different from the first embodiment, and other configurations are basically the same.

Hereinafter, a change in the state of the compression chamber will be described with reference to FIGS. As can be seen from FIGS.
08 is basically divided into four compression chambers C31, C32, C33, and C34 by four partition vanes 31. The rotation of the elliptical cylinder 308 causes the compression chambers C31, C32, C33, and C34 to contract and expand. First, at the rotation position in FIG. 7A, the compression chamber C31 is divided into two by the seal portion 30. That is, the partition vane 31 is provided on the rear side of the seal portion 30.
And a compression chamber C3a formed between the compression chamber C31a and the partition vane 31 in front of the seal portion 30.
1b. In the compression chamber C31a, the suction process is started by communicating with the suction port 35.
Further, in the compression chamber C31b, the volume is reduced by the seal portion 30 approaching the partition vane 31, and the compression chamber C31b is in a state immediately before the completion of the discharge step.

In C31, the portion of C31a is the same as that of FIG.
In (b), there is one compression chamber C31, which is enlarged and the suction action is further continued. 8 (c) and FIG. 8 (d), in the compression chamber C31, the suction port 35
And the compression action is performed. FIG.
At (e), the compression chamber 31 is again divided by the seal portion 30. In FIG. 8E, the compression chamber 31b on the front side of the seal portion 30 is a compression chamber that continuously operates from FIG. 8D, and in the compression chamber 31b on the front side of the seal portion 30, The internal refrigerant pressure is increased to a predetermined pressure, and the discharge operation is performed. Further, at C31a on the rear side of the seal portion 30, a new suction action has been started. The state of FIG. 8E is the same as the state of FIG. 7A, and the rotation angle of the rotor 21 is 180 degrees as can be easily determined from the rotation identification symbol P. 8 (f) to 9 (h) are the same as the changes in FIGS. 7 (a) to 8 (d). On the other hand, FIG.
As can be seen from FIGS. 8A to 8E, the other compression chambers C32, C33, and C34 are delayed from the compression chamber C3 by 90 degrees.
The same suction, compression, and discharge operations as those of 1 are performed.

Thus, when the rotor 21 makes one rotation,
Each of the two seal portions 30 approaches the partition vane 31 once, whereby the compression chambers C31, C
The ejection is performed twice each at 32, C33, and C34. Therefore, in the electric compressor according to this embodiment, the rotor 21
When one rotation is performed, discharge is performed eight times.

In the third embodiment, the number of the partition vanes 31 is four, but the number is not limited to four. For example, the number of compression chambers can be three, but if an even number is used as in this embodiment, each compression chamber C31,
Since C32, C33, and C34 are compressed, sucked, and discharged at symmetrical positions, the loads act symmetrically and cancel each other, so that the load balance is improved, and the vibration and noise are reduced as compared with the above-described embodiment. Is done.

Next, a specific example in which the four partition vanes 31 in the third embodiment are two is described as a fourth embodiment in FIGS. FIGS. 10 to 1
2 is a principle view similar to (a) to (h) in FIGS. 7 to 9 and shows a state in which the rotor 21 is rotated by 45 degrees with time. In these drawings, the same elements and parts as those described in the previous drawings are denoted by the same reference numerals,
The description will be simplified.

In the fourth embodiment, as can be seen from FIGS. 10 to 12, the four partition vanes 31 in the third embodiment are two symmetrically arranged, that is, linearly arranged. Things. Therefore, the discharge port 36 is 2
The two partition vanes 31 are arranged in the vicinity of the rear side of the partition vanes 31, respectively. The above configuration is different from the fourth embodiment, and the other configurations are basically the same as the fourth embodiment. Hereinafter, changes in the state of the compression chamber will be described with reference to these drawings. In these drawings, the coil spring 33 is shown only in FIG. 10A, and is omitted in other drawings.

As can be seen from FIGS. 10 to 12, the inside of the cylinder 308 is basically made up of two partition vanes 31.
It is divided into compression chambers C41 and C42. And
The rotation of the elliptical cylinder 308 causes the compression chambers C41 and C42 to contract and expand. First, FIG.
In the rotational position of (a), the compression chamber C41 is divided into two by the seal portion 30. That is, the seal portion 30
Compression chamber C formed between partition vane 31 at the rear side
41a and a compression chamber C41b formed between the partition vane 31 at the front side of the seal portion 30. Then, in the compression chamber C41a, the suction process is started by communicating with the suction port 35. Further, in the compression chamber C41b, the suction process is completed, and the compression process is now in progress. The compression process in the compression chamber C41b is continued also in FIG. 10 (b), and in FIG. 10 (c), the volume is reduced and the internal refrigerant pressure exceeds a predetermined pressure, and the discharge process is performed. FIG. 11 in which the rotor 21 is rotated 135 degrees.
In the state (d), the discharge process of the compression chamber C41b has been completed, and one compression chamber 41 is formed, which is the final stage of the suction process. Then, as shown in FIG. 11E, the rotor 21 further rotates by 45 degrees, and when the rotor 21 rotates half a half (180 degrees) from the state of FIG.
Return to the same state as (a). Therefore, when the rotor 21 makes one rotation, ejection is performed twice.

Further, the other compression chamber C42 is provided as shown in FIG.
In (a), like the compression chamber 41, it is divided into two by the seal part 30. That is, it is divided into a compression chamber C42a formed between the partition vane 31 on the rear side of the seal portion 30 and a compression chamber C42b formed between the partition vane 31 on the front side of the seal portion 30. The compression chamber C42a changes in the same manner as the compression chamber C41a,
The compression chamber C42b changes similarly to the compression chamber C41b.

Therefore, when the rotor 21 makes one rotation, the seal portion 30 is located twice in each of the two divided compression chambers C41 and C42, and when the rotor 21 makes one rotation,
Each ejection is performed twice. Therefore, in the electric compressor according to this embodiment, the discharge is performed four times when the rotor 21 makes one rotation. In addition, each compression chamber C41, C
Since compression, suction, and discharge are performed at the symmetrical position 42, the load is well balanced, and vibration and noise are reduced as in the third embodiment.

In the third and fourth embodiments, the cylinder 308 has an elliptical cross section, but may have an oval shape. In addition, the seal portion 30 of the fixed rotor 15 is a line contact seal portion 30.
As shown in FIG. That is, the cylinder 508
May be formed into a distorted elliptical shape, that is, an arc portion may be formed on the minor diameter portion of the ellipse so as to make surface contact with a part of the outer peripheral surface of the fixed rotor 15, and this surface contact portion may be used as the seal portion 530. . In addition, if comprised in this way, the sealing property before and behind the seal part 530 can be improved, and compression efficiency can be improved.

[0039]

Since the present invention is configured as described above, the following effects can be obtained. According to the first to fifth aspects of the present invention, since the compression mechanism is completely integrally formed in the electric motor, the size of the electric motor is reduced, and the installation space is reduced. According to the second aspect of the present invention, in addition to the above effects, the cylinder can be efficiently reduced and enlarged, and the discharge volume can be increased without increasing the outer shape of the electric compressor.

According to the third aspect of the present invention, in addition to the above effects, the cylinder can be more efficiently reduced and enlarged, and the discharge volume can be further increased without increasing the outer shape of the electric compressor. . According to the fourth aspect of the invention, in addition to the above-described effects, suction, compression, and discharge are performed at symmetrical positions sandwiching the rotation axis, so that the load is well balanced and vibration and noise are reduced. According to the fifth aspect of the invention, in addition to the above-described effects, since carbon dioxide is used as the refrigerant, the discharge capacity may be small, and the compression mechanism is downsized.
It becomes easier to employ the above configuration in the rotor of the electric motor.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view around a discharge chamber in FIG. 1;

FIGS. 4A to 4D are explanatory diagrams of the principle of the first embodiment, in which the state in which the rotor is rotated by 45 degrees is shown with time in (a) to (d).

5 is an explanatory diagram of the principle of the first embodiment, similar to FIG. 4; FIG.
(H).

FIGS. 6A to 6D are explanatory diagrams of the principle of the second embodiment, in which the state in which the rotor is rotated by 90 degrees is shown over time in FIGS.

FIGS. 7A to 7C are explanatory diagrams of the principle of the third embodiment, in which the state in which the rotor is rotated by 45 degrees is shown with time in FIGS.

8 is an explanatory diagram of the principle of the third embodiment, similar to FIG. 7; FIG.
(F).

9 is an explanatory diagram of the principle of the third embodiment, similar to FIG. 8, and FIG. 9 (g) and FIG.

FIGS. 10A to 10C are explanatory diagrams of the principle of the fourth embodiment, in which (a) to (c) show states in which the rotor is rotated by 45 degrees at a time.

11 is an explanatory diagram of the principle of the fourth embodiment, similar to FIG. 10, and shows states of continuation from FIG. 10 over time (d) to (f).

12 is an explanatory diagram of the principle of the fourth embodiment, similar to FIG. 11, in which (g) and (h) show states of continuation from FIG. 11 over time.

FIG. 13 shows a modification of the third and fourth embodiments.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Container main body, 3 ... Lid, 7 ... Discharge chamber, 8, 308, 508 ... Cylinder, 10 ... Electric motor, 11 ... Stator, 21 ... Rotor, 15 ... Fixed rotor,
30, 530: seal part, 31: partition vane, 33 ...
Coil spring, 35 ... suction port, 36 ... discharge port, 3
9 ... Discharge valve, C11, C12, C2, C31, C32,
C33, C34, C41, C42 ... compression chambers.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takashi Ban 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation

Claims (5)

[Claims] An electric motor including a closed container, a stator, a rotor, and the like built in the closed container; and an eccentric and parallel to an axis of rotation of the rotor within the rotor. A cylinder having a circular cross section formed so as to be fixed to the closed container so as to have the same axis as the rotation axis of the rotor, and having a circular cross section disposed in the cylinder. A fixed rotor; and a partition vane that is elastically extended and retractable from the fixed rotor so that a tip end portion thereof is pressed against the inner surface of the cylinder, and extends over the entire length of the fixed rotor in the axial direction. The inner diameter of the cylinder, the eccentric distance of the cylinder and the outer diameter of the fixed rotor so that the outer peripheral surface of the fixed rotor contacts a part of the inner peripheral surface of the rotor,
A suction port that opens into the cylinder from the inner circumferential surface of the cylinder is disposed at a portion immediately rearward of the contact portion of the fixed rotor with respect to the rotation direction, and further includes a fixed wall surface that closes an axial end surface of the cylinder. A discharge port that opens in a cylinder near the outer periphery of the fixed rotor is disposed in a portion immediately rearward of the partition vane in the rotation direction, and a discharge valve is disposed in the discharge port, and the cylinder inner surface and An electric compressor, wherein a compression chamber is formed by the fixed rotor and the partition vanes. 2. The partition vane comprises two partition vanes symmetrically arranged with the axis of the fixed rotor interposed therebetween, and the discharge port and the discharge valve are arranged for each partition vane. The electric compressor according to claim 1, wherein: 3. An electric motor having a hermetically sealed container, a stator, a rotor, and the like built in the hermetically sealed container, wherein the rotor has the same axis as the rotation axis of the rotor in the rotor. The formed cross-sectional shape is an elliptical or elliptical cylinder, and the cross-sectional shape fixed to the closed container so as to be the same axis as the rotation axis of the rotor, and disposed in the cylinder. A circular fixed rotor, and a plurality of partitions extending from the fixed rotor elastically so as to be able to move forward and backward such that a tip end portion thereof is pressed against an inner surface of the cylinder, and having a longitudinal direction extending in the axial direction of the fixed rotor. A vane, wherein the outer diameter of the fixed rotor and the minor axis of the cylinder are substantially the same, so that the outer peripheral surface of the stationary rotor is in contact with both inner surfaces of the minor diameter portions existing at symmetric positions of the cylinder. And the fixed rotor A suction port that opens into the cylinder from the inner circumferential surface of the cylinder is disposed at a portion immediately rearward of the rotation direction of each contact portion, and further, a fixed wall surface that closes an axial end surface of the cylinder, A discharge port that opens in a cylinder near the outer periphery of the fixed rotor is disposed in each of the rear-nearest portions in the rotation direction of each partition vane, and a discharge valve is disposed in each discharge port. An electric compressor, wherein a compression chamber is formed by an inner surface, the fixed rotor, and the partition vane. 4. The electric compressor according to claim 3, wherein said partition vanes are composed of two or four partition vanes radially arranged at equal intervals around an axis of said fixed rotor. . 5. The electric compressor according to claim 1, wherein carbon dioxide is used as the refrigerant.