JP2001012372A - Multi-cylinder rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the lowering of the noise of a multi-cylinder rotary compressor effectively. SOLUTION: As gas delivered from a cylinder 9 is delivered toward a motor 2 and gas delivered from the cylinder 10 is delivered from the circumferential direction of a hermetically closed vessel 1 to a space between a stator wire 7 and a rotary compression element 3, a stationary wave is destroyed and the excitation of a gas pole resonance can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder rotary compressor having a plurality of cylinders mounted on, for example, an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art A conventional multi-cylinder rotary compressor 10 of this kind is disclosed.
0 will be described with reference to FIGS. In each figure, 1
Reference numeral 01 denotes an airtight container, in which an electric motor (for example, a DC brushless motor) 102 is housed as an electric element on the upper side, and a rotary compression element 103 rotated by the motor 102 is housed on the lower side. The sealed container 101 has a two-part configuration including a cylindrical shell portion 101A having an open upper end and an end cap portion 101B for closing the upper end opening of the shell portion 101A.
After the rotary compression element 103 is accommodated, the end cap portion 101B is put on the shell portion 101A and sealed by high frequency welding or the like. Also,
The bottom inside the shell portion 101A of the closed container 101 serves as an oil reservoir B.

[0003] The electric motor 102 is supported by a stator 104 fixed to the inner wall of the sealed container 101 and a rotating shaft 106 extending in the axial direction of the cylinder of the sealed container 101.
And a rotor 105 rotatable around the rotation shaft 106. And
The stator 104 has a distributed winding system in which a stator iron core 174 formed by laminating a plurality of substantially donut-shaped stator iron plates and a plurality of teeth 175 formed on the inner periphery of the stator iron core 174 are provided. , And a stator winding (drive coil) 107 for applying a rotating magnetic field to the rotor 105. The outer peripheral surface of the stator core 174 is fixed by contacting the inner wall of the shell 101A of the closed casing 101.

In this case, a plurality of cutouts 176 are formed on the outer peripheral surface of the stator core 174, and the cutouts 176 are separated from the inner wall of the shell portion 101A, and constitute a passage 177 therein.

[0005] The compression element 103 includes a first rotary cylinder 109 and a second rotary cylinder 110 divided by an intermediate partition plate 108. Each cylinder 1
The eccentric portions 111 and 112 that are driven to rotate by the rotary shaft 106 are attached to the eccentric portions 09 and 110, respectively.
The eccentric positions of 11 and 112 are 180 degrees out of phase with each other.

[0006] 113 and 114 are cylinder 10
The first roller and the second roller rotate inside the cylinders 9 and 110, and rotate in the cylinder by rotation of the eccentric portions 111 and 112, respectively. 115 and 116 are a first bearing and a second bearing, respectively.
The first bearing 115 forms a closed compression space of the cylinder 109 with the intermediate partition plate 108, and the second bearing 116 similarly closes the cylinder 110 with the intermediate partition plate 108. Compressed space is formed. Also,
The first bearing 115 and the second bearing 116 are bearing portions 117 and 11 that rotatably support the lower portion of the rotating shaft 106, respectively.
8 is provided.

Reference numerals 119 and 120 denote cup mufflers, which are attached so as to cover the first bearing 115 and the second bearing 116, respectively. The cylinder 109 and the cup muffler 119 are connected to each other through a communication hole (not shown) provided in the first bearing 115, and the cylinder 110 and the cup muffler 120 are connected to a communication hole (not shown) provided in the second bearing 116. Communication. Furthermore, the lower cup muffler 1
Reference numeral 20 communicates with the inside of the upper cup muffler 119 by a through hole 179 penetrating through each bearing and cylinder.

Reference numeral 122 denotes a discharge pipe provided on the closed container 101, and 123 and 124 denote cylinders 10 respectively.
9 and 110 are suction pipes. Reference numeral 125 denotes a sealed terminal which supplies electric power to the stator winding 107 of the stator 104 from the outside of the sealed container 101 (lead wires connecting the sealed terminal 125 and the stator winding 107 are not shown in the figure). Zu).

Reference numeral 126 denotes a rotor iron core of the rotor 105, which is formed from an electromagnetic steel sheet having a thickness of 0.3 mm to 0.7 mm as shown in FIG.
A plurality of iron plates for a rotor punched into a shape as shown in FIG. 11 and FIG. 11 are laminated, and are caulked together to be laminated integrally.

In this case, the rotor iron plate of the rotor core 126 is punched out of an electromagnetic steel plate so as to form salient pole portions 128 to 131 constituting four poles.
Reference numerals 135 are concave portions provided so that salient pole portions are formed between the salient pole portions 128 to 131, respectively.

Reference numerals 141 to 144 denote slots for press-fitting the magnetic body 145 (permanent magnet).
In the outer peripheral side of the rotor core 126, they are formed concentrically along the axial direction of the rotating shaft 106.

Reference numeral 146 denotes a hole formed at the center of the rotor iron core 126 and in which the rotating shaft 106 is shrunk. 14
Reference numerals 7 to 150 denote through holes of a size and shape through which rivets 151 for caulking to be described later are passed.
It is drilled corresponding to the inside of 1-144. Furthermore, 1
Reference numerals 61 to 164 denote air holes formed between the through holes 147 to 150 to form oil passages. After laminating a plurality of iron plates for the rotor, the rotor iron core 126 is formed by caulking and integrating them.

On the other hand, the magnetic body 145 is made of a rare earth magnet material such as a praseodymium magnet or a neodymium magnet whose surface is nickel-plated. It is shaped. Each of the slots 141 to 144 has a size into which the magnetic body 145 is inserted.

Next, 166 and 167 are rotor iron cores 126.
Is a flat plate-shaped end member attached to the upper and lower ends, and is formed in a substantially disk shape from a nonmagnetic material such as aluminum or a resin material. The end members 166 and 167 are also provided with through holes at positions corresponding to the through holes 147 to 150.

Reference numeral 172 denotes a disk-shaped oil separating plate which is mounted on the rotor 105 and is located above the end member 166. Reference numeral 173 denotes a balance weight mounted between the plate 172 and the end member 166. is there.

In such a configuration, the stator 104 of the electric motor 102
When the stator winding 107 is energized, a rotating magnetic field is formed and the rotor 105 rotates. Due to the rotation of the rotor 105, the rollers 113 and 114 in the cylinders 109 and 110 are eccentrically rotated via the rotating shaft 106, and the suction pipe 12 is rotated.
The suction gas sucked from 3, 124 is compressed.

The compressed high-pressure gas is discharged from the cylinder 109 into the cup muffler 119 through the communication hole, and the discharge hole 183 formed in the cup muffler 119 is formed.
From above into the closed container 101 (toward the electric motor 102). On the other hand, the liquid is discharged from the cylinder 110 to the cup muffler 120 via the communication hole, discharged through the through hole 179 into the cup muffler 119, and discharged from the discharge hole 183 of the cup muffler 119 into the upper sealed container 101. Is done.

The discharged high-pressure gas passes through a gap in the electric motor 102, reaches a discharge pipe 122, and is discharged to the outside.
On the other hand, oil is contained in the gas, and this oil is separated by the plate 172 or the like before reaching the discharge pipe 122, goes outward by centrifugal force, and flows down to the oil sump B via the passage 177 or the like. Met.

[0019]

As described above, in this kind of multi-cylinder rotary compressor 100, the cylinder 10
9 and the gas discharged from the lower cylinder 110 are discharged from the cup muffler 119 into the space inside the lower sealed container 101 on the lower side of the electric motor 102 in a state of being out of phase by 180 degrees. Excited, closed container 1
A standing wave is generated in the circumferential direction of the cylinder No. 01.

FIG. 12 shows a mode of air column resonance below the electric motor 102. In the figure, and indicate the standing waves of the first-order mode and the second-order mode at the positions indicated by and in FIG. 9, and the pressure indicated by hatching in the figure is higher than that of the other parts. Has become.

When such column resonance is excited, low-frequency sounds of 600 Hz to 1.6 kHz increase as shown by hatching in FIG. Such a constant frequency sound is likely to penetrate through the closed casing 101, so that the noise during operation is significantly increased.

Therefore, as shown in FIG.
01, a lower end of the bypass pipe 121 is communicated with a lower cup muffler 120 through a through hole 179, and an upper end of the bypass pipe 121 is placed in the closed vessel 101 above the rotary compression element 103. The structure to open to the wall was adopted.

This is because the gas discharged from the lower cylinder 110 by the bypass pipe 121 is discharged into the closed container 101 from the circumferential direction of the cylinder of the closed container 101 and the standing wave in the lower direction of the electric motor 102 in the circumferential direction. However, since the stator winding 107 constituting the stator 104 of the conventional electric motor 102 is of a distributed winding type, as shown in FIGS. Line 107
Project relatively large up and down from the stator core 174.

Therefore, as shown in FIG.
Considering the bending radius of the motor 21, the upper end is
Since the gas opens toward the outer surface of the stator winding 107 protruding downward from the outer periphery of the stator winding 107 and the gas is discharged from the circumferential direction toward the stator winding 107, the circumferential standing wave is generated. Could not be effectively destroyed. The hatching in FIG. 8 shows the case of the structure of FIG. 13, and the structure of FIG. 9 actually makes the low-frequency sound louder.

The present invention has been made to solve such a conventional technical problem, and has as its object to effectively reduce the noise of a multi-cylinder rotary compressor.

[0026]

A multi-cylinder rotary compressor according to the present invention accommodates an electric element and a rotary compression element in a closed container,
The rotary compression element includes an intermediate partition plate, first and second cylinders provided on both sides of the intermediate partition plate, and eccentric portions whose rotation angles are shifted by 180 degrees from each other. , A rotating shaft extending in and connected to the electric element, a roller fitted in the eccentric portion of the rotating shaft and rotating in the cylinder, and a bearing for closing each opening of the cylinder. A, comprising a stator having a stator winding and fixed to a sealed container, and a rotor supported on a rotating shaft and rotatable inside the stator, The gas discharged from the first cylinder is discharged toward the electric element, and the gas discharged from the second cylinder is discharged into the space between the stator winding and the rotary compression element from the circumferential direction of the sealed container. It is characterized by making it.

A multi-cylinder rotary compressor according to a second aspect of the present invention is characterized in that a bypass pipe for guiding gas discharged from the second cylinder is mounted outside the closed vessel.

In the multi-cylinder rotary compressor according to a third aspect of the present invention, in each of the above-mentioned inventions, the electric element includes a stator core constituting a stator, a plurality of teeth and slots formed in the stator core. And a motor of a magnetic pole concentrated winding type system in which a stator winding is directly wound using a slot portion in each tooth portion.

According to the present invention, the motorized element and the rotary compression element are housed in the closed container, and the rotary compression element is provided with the intermediate partition plate and the first and second rotary plates provided on both sides of the intermediate partition plate. And a rotary shaft having an eccentric portion whose rotation angle is shifted by 180 degrees from each other and extending in the axial direction of the sealed container and connected to the electric element, and a cylinder fitted to the eccentric portion of the rotary shaft, respectively. In addition to a roller that rotates inside and a bearing that seals each opening of the cylinder, the electric element is fixed to a stator having a stator winding and fixed to a sealed container, and supported by a rotating shaft and fixed. In a multi-cylinder rotary compressor composed of a rotor rotatable inside a child, a gas discharged from a first cylinder is discharged toward an electric element and discharged from a second cylinder. Gas winding stator Since the liquid is discharged into the space between the rotary compression elements from the circumferential direction of the closed container, the circumferential standing wave generated in the space in the closed container between the electric element and the rotary compression element is transferred to the second cylinder. It is destroyed by the gas discharged from the air, and it becomes possible to prevent the excitation of the air column resonance.

As a result, the low frequency sound generated by the excitation of the air column resonance can be reduced, and the compressor can be significantly reduced in noise. In particular, if a bypass pipe for guiding the gas discharged from the second cylinder is attached to the outside of the closed container as in the invention of claim 2, the gas discharged from the second cylinder with a relatively simple structure is provided. Can be discharged between the electric element and the rotary compression element in the circumferential direction, and if the electric element is constituted by a magnetic pole concentrated winding type motor as in the third aspect of the present invention, the stator can be fixed from the stator core. Since the projected size of the child winding becomes smaller,
In order that the gas from the second cylinder can reliably collide with the standing wave in the circumferential direction at a bending radius within a range permitted by the bypass pipe, the excitation of the columnar resonance can be effectively prevented. Become. Further, by employing such a motor, the overall size of the multi-cylinder rotary compressor can be reduced.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of a multi-cylinder rotary compressor C to which the present invention is applied. In this figure, reference numeral 1 denotes a cylindrical hermetic container.
Is stored. The closed container 1 has a two-part structure including a cylindrical shell part 1A having an open upper end and an end cap part 1B closing the upper end opening of the shell part 1A. The electric motor 2 and the compression element are provided in the shell part 1A. After storing 3, the end cap portion 1B is put on the shell portion 1A,
It is constituted by sealing by high frequency welding or the like. In addition, the bottom inside the shell portion 1A of the closed container 1 serves as an oil reservoir B.

The motor 2 is a so-called magnetic pole concentrated winding type DC brushless motor, and is fixed to a stator 4 fixed to the inner wall of the sealed container 1 and a rotating shaft 6 extending in the axial direction of the cylinder of the sealed container 1. And a rotor 5 rotatable about the rotation shaft 6 inside the stator 4. As shown in FIG. 3, the stator 4 includes a stator core 74 formed by laminating a plurality of substantially donut-shaped stator iron plates (silicon steel plates), and a stator for applying a rotating magnetic field to the rotor 5. And a winding (drive coil) 7.

In this case, six teeth 75 are provided on the inner periphery of the stator core 74, and a slot 78 which is open inward and vertically is formed between the teeth 75. A tip portion 75 </ b> A is formed at the tip of the tooth portion 75 so as to extend along the outer surface of the rotor 5. Then, by directly winding the stator winding 7 using the space of the slot portion 78 around the tooth portion 75, the magnetic poles of the stator 4 are formed by a so-called concentrated series winding method, and the four poles and six slots are provided. The stator 4 is constituted.

By adopting such a magnetic pole concentrated winding type DC brushless motor as the electric motor 2, the dimension of the stator winding 7 projecting up and down from the stator core 74 is smaller than that of the conventional one (FIGS. 9 and 13). Significantly reduced. Further, as shown in FIG. 3, since the cross-sectional area of the slot portion 78 of the stator core 74 is increased, as shown in FIG. It has been significantly expanded.

Then, the outer peripheral surface of the stator core 74 is fixed in contact with the inner wall of the shell 1A of the closed casing 1. In this case, a plurality of cutouts 76 (six in the present embodiment) are formed on the outer peripheral surface of the stator core 74 by cutting the circumference in a chord shape, and the cutouts 76 are separated from the inner wall of the shell portion 1A. An oil return passage 77 is formed therein as described later.

On the other hand, the rotary compression element 3 includes a first rotary cylinder 9 and a second rotary cylinder 10 separated by an intermediate partition plate 8. Each cylinder 9,
Eccentric portions 11 and 12 that are driven to rotate by the rotating shaft 6 are attached to 10, and the eccentric portions 11 and 12 are 180 degrees out of phase with each other.

Reference numerals 13 and 14 denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate in the cylinders 9 and 10 by rotation of the eccentric portions 11 and 12, respectively. Reference numerals 15 and 16 denote a first bearing and a second bearing, respectively, and the first bearing 15 is provided between the cylinder 9 and the intermediate partition plate 8.
The second bearing 16 similarly forms a closed compression space of the cylinder 10 between the second bearing 16 and the intermediate partition plate 8. Further, the first bearing 15 and the second bearing 1
The bearing 6 includes bearing portions 17 and 18 that rotatably support the lower portion of the rotating shaft 6.

Reference numerals 19 and 20 denote cup mufflers, which are attached so as to cover the first bearing 15 and the second bearing 16, respectively. The cylinder 9 and the cup muffler 19 are communicated with each other through a communication hole (not shown) provided in the first bearing 15, and the cylinder 10 and the cup muffler 20 are also connected to the second bearing 1.
6 through a communication hole (not shown).
The lower cup muffler 20 has cylinders 9, 1
0, which communicates with the cup muffler 19 on the upper surface via a through hole 79 penetrating the intermediate partition plate 8.

Further, openings 1C and 1C are formed in the side wall of the shell portion 1A on the side of the cylinder 9 and the side wall of the shell portion 1A on the lower end of the stator winding 7 as shown in FIG. The upper end opening 21A and the lower end opening 21B of the bypass pipe 21 are inserted into the openings 1C and 1C from the outside of the closed container 1, respectively, and are fixed to the shell portion 1A by welding.

The lower end opening 2 of the bypass pipe 21
1B communicates with the inside of the cup muffler 20 through the through hole 79 in the cylinder 9, and the lower end of the upper end opening 21A is lower than the lower end surface of the stator winding 7 of the stator 4. It is more desirable that the upper end opening 21A be completely opened below the stator winding 7 within the allowable range of the bending radius of the bypass pipe 21.

Reference numeral 22 denotes a discharge pipe provided on the closed vessel 1, and reference numerals 23 and 24 denote suction pipes connected to the cylinders 9 and 10, respectively. Reference numeral 25 denotes a sealed terminal for supplying electric power to the stator winding 7 of the stator 4 from outside the sealed container 1 (lead wires connecting the sealed terminal 25 and the stator winding 7 are shown in the drawing). Zu).

Reference numeral 26 denotes a rotor iron core of the rotor 5, which is formed by laminating a plurality of iron plates for a rotor punched out of an electromagnetic steel sheet having a thickness of 0.3 mm to 0.7 mm into a shape as shown in FIGS. They are stacked together.

In this case, the rotor iron plate of the rotor iron core 26 is punched from an electromagnetic steel plate so as to form salient pole portions 28 to 31 constituting four poles of magnetic poles, and 32 to 35 denote respective protruding portions. It is a concave portion provided so that a salient pole portion is formed between the pole portions 28 to 31.

Reference numerals 41 to 44 denote slots for press-fitting the magnetic bodies 45 (permanent magnets). The slots 41 to 44 correspond to the salient pole portions 28 to 31, and are provided on the outer peripheral side of the rotor core 26 in the axial direction of the rotating shaft 6. Along the concentric circle along.

Reference numeral 46 denotes a hole formed at the center of the rotor iron core 26, in which the rotating shaft 6 is shrunk. Numerals 47 to 50 denote through holes of a size and a shape through which rivets 51... To be described later are passed, and are drilled inside the slots 41 to 44. Further, reference numerals 61 to 64 denote air holes formed between the through holes 47 to 50 to form oil passages. After laminating a plurality of rotor iron plates, the rotor iron plates 26 are formed by caulking each other and integrating them.

On the other hand, the magnetic body 45 is made of a rare earth magnet material such as a praseodymium magnet or a neodymium magnet whose surface is plated with nickel.
Its outer shape is rectangular as a whole with a rectangular cross section. Each of the slots 41 to 44 is
5 is large enough to be inserted.

Reference numerals 66 and 67 denote flat end members attached to the upper and lower ends of the rotor core 26, which are made of a plate made of a non-magnetic material such as aluminum or resin.
The recesses 32 to 32 have substantially the same shape as the stator core 26.
Cutouts 81 are formed at positions corresponding to 35,
Similar air holes 82 are also provided at positions corresponding to the air holes 61 to 64.
Are perforated (FIG. 5). And this end face member 6
Through holes 6 and 67 are also provided at positions corresponding to the through holes 47 to 50.

Numeral 72 is a disk-shaped oil separating plate mounted on the rotor 5 above the end member 66, and 73 is a balance weight mounted between the plate 72 and the end member 66. (See FIGS. 4 and 6).

With the above arrangement, when the stator winding 7 of the stator 4 of the electric motor 2 is energized, a rotating magnetic field is formed and the rotor 5 rotates. Due to the rotation of the rotor 5, the rollers 13 and 14 in the cylinders 9 and 10 are eccentrically rotated via the rotary shaft 6, and the suction gas drawn from the suction pipes 23 and 24 is compressed.

The compressed high-pressure gas is discharged from the upper cylinder 9 into the cup muffler 19 through the communication hole, and the discharge holes 83 and 8 formed in the cup muffler 19 are formed.
It is discharged into the closed container 101 from above 3 (in the direction of the electric motor 4) (indicated by a broken arrow in FIG. 7). On the other hand, cylinder 10
Is discharged into the cup muffler 20 through the communication hole, a part of the liquid enters the cup muffler 19 through the through hole 79, and is similarly discharged from the discharge holes 83, 83, while the rest is bypassed from the lower end opening 21B. Enter the pipe 21 and open the upper end 2
The air is discharged from 1A into the lower space of the electric motor 2 (the space between the electric motor 2 and the rotary compression element 3) from the circumferential direction of the cylinder of the sealed container 1.

At this time, at least half of the upper end opening 21A of the bypass pipe 21 is opened below the stator winding 7 as described above. Directly collide with the circumferential standing wave that is about to occur in the space.

Thus, the circumferential standing wave generated in the space inside the closed vessel 1 between the electric motor 2 and the rotary compression element 3 is effectively destroyed, and the excitation of the columnar resonance is prevented beforehand. Therefore, the low-frequency sound generated by the excitation of the columnar resonance is reduced, and the noise of the multi-cylinder rotary compressor C can be significantly reduced.

In the embodiment, the gas discharged from the cylinder 10 is guided to both the cup muffler 19 and the bypass pipe 21. However, the invention is not limited thereto, and the gas may be guided to only the bypass pipe 21.

The gas discharged into the sealed container 1 is discharged from the discharge pipe 22 to the outside through each passage in the electric motor 2. Further, the oil is separated by the plate 72 and the passage 7
7 and returns to the oil sump B.

[0055]

As described in detail above, according to the present invention, an electric element and a rotary compression element are housed in a closed container, and the rotary compression element is provided on both sides of the intermediate partition plate and the intermediate partition plate. First and second cylinders, an eccentric portion whose rotational angle is shifted by 180 degrees from each other, a rotary shaft extending in the axial direction of the sealed container and connected to the electric element, and eccentricity of the rotary shaft. A roller that is fitted into each part and rotates within the cylinder, and a bearing that is configured with a bearing that seals each opening of the cylinder, and that the electric element has a stator winding and is fixed to a sealed container, In a multi-cylinder rotary compressor comprising a rotor supported on a rotating shaft and rotatable inside a stator, a gas discharged from the first cylinder is discharged toward an electric element, Discharged from the second cylinder As a result, the air is discharged into the space between the stator windings and the rotary compression element from the circumferential direction of the closed container, so that the circumferential direction generated in the space inside the closed container between the electric element and the rotary compression element is fixed. The standing wave is destroyed by the gas discharged from the second cylinder, and it becomes possible to prevent the excitation of the columnar resonance.

As a result, low-frequency sound generated by the excitation of air column resonance can be reduced, and the compressor can be significantly reduced in noise. In particular, if a bypass pipe for guiding the gas discharged from the second cylinder is attached to the outside of the closed container as in the invention of claim 2, the gas discharged from the second cylinder with a relatively simple structure is provided. Can be discharged between the electric element and the rotary compression element in the circumferential direction, and if the electric element is constituted by a magnetic pole concentrated winding type motor as in the third aspect of the present invention, the stator can be fixed from the stator core. Since the projected size of the child winding becomes smaller,
In order that the gas from the second cylinder can reliably collide with the standing wave in the circumferential direction at a bending radius within a range permitted by the bypass pipe, the excitation of the columnar resonance can be effectively prevented. Become. Further, by employing such a motor, the overall size of the multi-cylinder rotary compressor can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a multi-cylinder rotary compressor according to an embodiment to which the present invention is applied.

FIG. 2 is a plan sectional view of the multi-cylinder rotary compressor shown in FIG.

FIG. 3 is a plan view of a stator core and a rotor core of the multi-cylinder rotary compressor shown in FIG.

FIG. 4 is a vertical side view of a rotor of the multi-cylinder rotary compressor shown in FIG. 1;

FIG. 5 is a bottom view of the rotor of the multi-cylinder rotary compressor shown in FIG.

FIG. 6 is a top view of a rotor of the multi-cylinder rotary compressor shown in FIG.

FIG. 7 is an enlarged vertical sectional side view of a bypass pipe portion of the multi-cylinder rotary compressor shown in FIG. 1;

FIG. 8 is a diagram showing a sound pressure level of noise generated by a multi-cylinder rotary compressor.

FIG. 9 is a vertical side view of a conventional multi-cylinder rotary compressor.

FIG. 10 is a plan sectional view of the multi-cylinder rotary compressor shown in FIG. 9;

FIG. 11 is a plan view of a stator core and a rotor core of the multi-cylinder rotary compressor shown in FIG. 9;

12 is a diagram illustrating an air column resonance mode in a space below the electric motor of the multi-cylinder rotary compressor shown in FIG.

FIG. 13 is a vertical sectional side view of another conventional multi-cylinder rotary compressor.

[Explanation of symbols]

 C Multi-cylinder rotary compressor 1 Closed vessel 1A Shell part 1B End cap part 2 Electric motor (electric element) 4 Stator 5 Rotor 6 Rotary shaft 7 Stator winding 9, 10 Cylinder 11, 12 Eccentric part 13, 14 Roller 19 , 20 Cup muffler 21 Bypass tube 26 Rotor core 74 Stator core 75 Tooth portion 76 Slot portion 83 Discharge hole

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tsuyoshi Higuchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd. (72) Inventor Dai Matsuura 2-5-5 Sanyo Electric Co., Ltd., Moriguchi-shi, Osaka (72) Inventor Yuasa Sato Keihanmoto, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. F-term (reference) 3H029 AA04 AA09 AA13 AB03 BB00 BB21 BB26 CC07 CC23 CC25 CC27 CC28 CC29 5H603 AA09 BB01 BB07 BB10 BB12 CA01 CA05 CB02 CB17 CC05 CC07 CC11 CD04 CD21

Claims (3)

[Claims] An electric element and a rotary compression element are housed in a closed container, and the rotary compression element is provided with an intermediate partition plate, and first and second cylinders provided on both sides of the intermediate partition plate, respectively. It has eccentric parts whose rotation angles are shifted by 180 degrees from each other,
A rotary shaft extending in the axial direction of the closed container and connected to the electric element, a roller fitted in an eccentric portion of the rotary shaft and rotating in the cylinder, and a respective opening of the cylinder is sealed. And a bearing, and the electric element has a stator winding and is fixed to the hermetic container, and is rotatably supported inside the stator supported by the rotating shaft. A multi-cylinder rotary compressor including a rotor, wherein the gas discharged from the first cylinder is discharged toward the electric element, and the gas discharged from the second cylinder is fixed to the stator. A multi-cylinder rotary compressor, wherein the discharge is performed in a space between a winding and the rotary compression element from a circumferential direction of the hermetic container. 2. The multi-cylinder rotary compressor according to claim 1, wherein a bypass pipe for guiding gas discharged from the second cylinder is mounted outside the closed vessel. 3. The electric element includes a stator core constituting a stator, and a plurality of teeth and slots formed on the stator core, and is fixed to each tooth using the slots. The multi-cylinder rotary compressor according to claim 1 or 2, wherein the motor is a magnetic pole concentrated winding type motor in which a child winding is directly wound.