JP2001027191A - Multi-cylinder rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-cylinder rotary compressor to reduce the number of balancers to prevent the vibration. SOLUTION: In this compressor, a balancer 28 is mounted only on an end part opposite to a rotary compressive element 3 of a rotor 5, the eccentricity of the mass of a first eccentric part 12 is set to be smaller than that of a second eccentric part 11. The balance can be taken for eccentricity without fitting any balancer on the other end of the rotor 5.

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 mounted on, for example, an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art A conventional multi-cylinder rotary compressor 100 will be described with reference to FIG. In this figure, reference numeral 1 denotes a cylindrical hermetic container, in which an electric motor 2 is housed as an electric element on the upper side, and a rotary compression element 103 rotatably driven by the electric motor 2 is housed on the lower side. 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. 1
03, the end cap 1B is attached to the shell 1
A and is sealed by high frequency welding or the like. Further, the shell portion 1A of the closed container 1
The bottom inside is an oil reservoir B.

[0003] The electric motor 2 is a DC brushless motor,
A stator 4 fixed to the inner wall of the closed container 1;
And a rotor 5 which is fixed to a rotating shaft 6 extending in the axial direction of the cylinder and is rotatable about the rotating shaft 6 inside the stator 4. The stator 4 includes a stator iron core 41 formed by laminating a plurality of substantially donut-shaped stator iron plates (silicon steel plates), and a stator winding (drive coil) for applying a rotating magnetic field to the rotor 5. 7 is comprised. The outer peripheral surface of the stator core 41 abuts on the inner wall of the shell 1A of the closed casing 1, and the electric motor 2 is fixed.

On the other hand, the rotary compression element 103 is
And a second rotary cylinder 9 and a first rotary cylinder 110 partitioned by. The rotating shaft 6 includes a second eccentric portion 11 and a first eccentric portion 112 which are driven to rotate in the cylinders 9 and 110, respectively. Are out of phase.

[0005] 13 and 114 are cylinders 9 and 11 respectively.
0, a second roller and a first roller that rotate in the cylinders 9 and 110 by rotation of the eccentric portions 11 and 112, respectively.
Turn around. Reference numerals 15 and 16 denote a first bearing and a second bearing, respectively. The first bearing 15 forms a closed compression space of the cylinder 9 between the first bearing 15 and the intermediate partition plate 8, and the second bearing 16 is similarly formed. A closed compression space of the cylinder 110 is formed between the cylinder 110 and the intermediate partition plate 8. In addition, the first bearing 15 and the second bearing 15
Are provided with bearing portions 17 and 18 that rotatably support the lower portion of the rotating shaft 6.

The first bearing 15 on the upper side is fixed to the inner wall of the shell 1A of the closed casing 1, and the cylinder 9, the intermediate partition plate 8, the cylinder 110 and the second
Of bearings 16 are sequentially fixed.

Next, reference numeral 20 denotes a cup muffler, which is attached so as to cover the lower side of the second bearing 16. still,
The cylinder 9 is communicated with the inside of the sealed container 1 on the bearing 15 through a communication hole (not shown) provided in the bearing 15. Also,
The cylinder 110 and the cup muffler 20 are communicated with each other through a communication hole (not shown) provided in the second bearing 16, and the lower cup muffler 20 is a through hole (not shown) penetrating through the cylinders 9 and 110 and the intermediate partition plate 8. Is connected to the inside of the closed container 1 on the bearing 15 through the opening.

Reference numeral 22 denotes a discharge pipe provided on the closed container 1, and reference numeral 23 denotes a suction pipe connected to the cylinders 9 and 110 (the cylinder 110 is provided with a passage 127). 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).

On the other hand, reference numeral 26 denotes a rotor core of the rotor 5, in which a plurality of rotor iron plates punched out of a magnetic steel sheet having a thickness of 0.3 mm to 0.7 mm into a predetermined shape are laminated, caulked together, and integrated. Are laminated. Also, 128, 129
Are balance weights mounted above and below the rotor core 26.

With the above configuration, 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, 114 in the cylinders 9, 110 are eccentrically rotated via the rotary shaft 6, and the suction gas drawn from the suction pipe 23 is compressed.

The compressed high-pressure gas is discharged from the upper cylinder 9 into the closed container 1 through the communication hole. On the other hand, the fluid is discharged from the cylinder 110 to the cup muffler 20 through the communication hole, and similarly discharged into the closed container 1 through the through hole.

The gas discharged into the sealed container 1 is
It is discharged from the discharge pipe 22 to the outside through the inside. In addition, the oil is separated and passes between the electric motor 2 and the sealed container 1 and returns to the oil reservoir B.

[0013]

The balancers 128 and 129 are provided for the purpose of canceling out vibrations caused by the eccentric rotation of the eccentric portions 11 and 112 (rollers 13 and 114) in the cylinders 9 and 110. In this case, the mass eccentricity of the cylinder 110 is m1 × r1, and the mass eccentricity of the cylinder 9 is m2 × r
2. The mass eccentricity of the balancer 129 is m3 × r3, the mass eccentricity of the balancer 128 is m4 × r4, the distance from the cylinder 110 to the cylinder 9 is L2, the distance from the balancer 129 to L3, and the distance to the balancer 128 is L4. Then,
The mass eccentricity in each cylinder 110, 9 is m1 × r1 =
m1 × r1 + m4 × r4 = m2 × r2 + m3 × r3 m4 × r4 × L4 = m2 × r2 × L2 + m3 × r3 × L
Balance is achieved when the relationship of 3 holds. Therefore, the mass of each balancer is set so that the relational expression holds (see FIG. 6).

However, in the conventional multi-cylinder rotary compressor, since the lower balancer 129 is required, the number of parts is increased, the cost is increased, the weight is increased, and the productivity is deteriorated. I was

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional technical problem, and has as its object to provide a multi-cylinder rotary compressor capable of reducing the number of balancers for preventing vibration.

[0016]

According to a first aspect of the present invention, there is provided a multi-cylinder rotary compressor in which an electric element and a rotary compression element are housed in a closed container, and the rotary compression element is connected to an intermediate partition plate and an intermediate partition plate. It has a second cylinder provided on the electric element side of the plate, a first cylinder provided on the opposite side of the intermediate partition plate, and first and second eccentric portions whose rotation angles are shifted by 180 degrees from each other. A rotating shaft connected to the electric element, and first and second rollers fitted in first and second eccentric portions of the rotating shaft and rotating in the first and second cylinders, respectively. And a bearing for closing each opening of each cylinder, and the electric element is constituted by a stator and a rotor supported on a rotating shaft and rotatable inside the stator. At the end of the rotor opposite the rotary compression element Is attached only balancer, the mass eccentricity of the first eccentric portion, characterized by being smaller than the mass eccentricity of the second eccentric portion.

In the multi-cylinder rotary compressor according to the second aspect of 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 an intermediate partition plate and on the electric element side of the intermediate partition plate. The second cylinder provided and the first cylinder provided on the opposite side of the intermediate partition plate have a rotation angle of 180 degrees with each other.
A rotating shaft having first and second eccentric portions shifted by degrees and connected to the electric element, and first and second eccentric portions fitted to the first and second eccentric portions of the rotating shaft, respectively; The first and second rollers each rotate in a cylinder, and a bearing that seals each opening of each cylinder. The electric element is mounted on a stator and supported by a rotating shaft inside the stator. A balancer is attached only to the end of the rotor opposite to the rotary compression element, and the first cylinder is made smaller than the second cylinder. It is characterized by being thin.

In the multi-cylinder rotary compressor according to the third aspect of 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 an intermediate partition plate and on the electric element side of the intermediate partition plate. The second cylinder provided and the first cylinder provided on the opposite side of the intermediate partition plate have a rotation angle of 180 degrees with each other.
A rotating shaft having first and second eccentric portions shifted by degrees and connected to the electric element, and first and second eccentric portions fitted to the first and second eccentric portions of the rotating shaft, respectively; The first and second rollers each rotate in a cylinder, and a bearing that seals each opening of each cylinder. The electric element is mounted on a stator and supported by a rotating shaft inside the stator. A balancer is attached only to the end of the rotor opposite to the rotary compression element, and the weight of the first eccentric part is reduced by the second eccentric part. Characterized in that it is lighter than the eccentric part.

The mass eccentricity in the first cylinder is m1 ×
r1, the mass eccentricity in the second cylinder is m2 × r2,
According to the present invention, when the mass eccentricity of the balancer is m4 × r4 and the distances from the first cylinder to the second cylinder and the balancer are L2 and L4, respectively, according to the present invention, m1 × r1
<M2 × r2> By selecting the weight and mounting position of the balancer, eccentric balance is obtained as m1 × r1 + m4 × r4 = m2 × r2 m4 × r4 × L4 = m2 × r2 × L2 Will be able to

That is, the eccentric balance can be obtained without attaching a balancer which is usually attached to the rotary compression element side of the rotor, so that the number of parts is reduced and the weight is reduced without increasing vibration and noise. Thus, productivity can be improved.

[0021]

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 according to one embodiment of the present invention. Note that FIG.
The same reference numerals are used for the same components. That is, 1 is a cylindrical airtight container, and an electric motor 2
A rotary compression element 3 that is driven to rotate by the electric motor 2 is housed on the lower side. 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 electric motor 2 is a DC brushless motor,
A stator 4 fixed to the inner wall of the closed container 1;
And a rotor 5 which is fixed to a rotating shaft 6 extending in the axial direction of the cylinder and is rotatable about the rotating shaft 6 inside the stator 4. The stator 4 includes a stator iron core 41 formed by laminating a plurality of substantially donut-shaped stator iron plates (silicon steel plates), and a stator winding (drive coil) for applying a rotating magnetic field to the rotor 5. 7 is comprised. The outer peripheral surface of the stator core 41 abuts on the inner wall of the shell 1A of the closed casing 1, and the electric motor 2 is fixed.

On the other hand, the rotary compression element 3 includes a second rotary cylinder 9 and a first rotary cylinder 10 separated by an intermediate partition plate 8. Each cylinder 9,
A second eccentric portion 11 and a first eccentric portion 12 of the rotary shaft 6 that is driven to rotate by the rotary shaft 6 are provided in 10, and these eccentric portions 11 and 12 are located at eccentric positions. Are one with each other
80 degrees out of phase.

Reference numerals 13 and 14 denote a second roller and a first 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.

The upper first bearing 15 is fixed to the inner wall of the shell portion 1A of the closed casing 1, and the cylinder 9, the intermediate partition plate 8, the cylinder 10 and the second bearing 16 are sequentially arranged below the upper first bearing 15. It has a fixed structure.

Next, reference numeral 20 denotes a cup muffler, which is attached so as to cover the lower side of the second bearing 16. still,
The cylinder 9 is communicated with the inside of the sealed container 1 on the bearing 15 through a communication hole (not shown) provided in the bearing 15. Also,
The cylinder 10 and the cup muffler 20 are communicated with each other through a communication hole (not shown) provided in the second bearing 16, and the lower cup muffler 20 is connected to the cylinders 9 and 10 and the intermediate partition plate 8.
Through the through hole (not shown) penetrating through the inside of the sealed container 1 on the bearing 15.

Reference numeral 22 denotes a discharge pipe provided on the closed container 1, and reference numeral 23 denotes a suction pipe connected to the cylinders 9, 10 (the cylinder 10 is provided with a passage 27). Also, 25
Is 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 not shown).

On the other hand, reference numeral 26 denotes a rotor core of the rotor 5, in which a plurality of rotor iron plates punched into a predetermined shape from an electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm are laminated, caulked together, and integrated. Are laminated. Reference numeral 28 denotes a balancer (balance weight) attached to the upper end of the rotor core 26.

With the above configuration, 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. The rotation of the rotor 5 causes the rollers 13 and 14 in the cylinders 9 and 10 to rotate eccentrically via the rotation shaft 6, and the suction gas drawn from the suction pipe 23 is compressed.

The compressed high-pressure gas is discharged from the upper cylinder 9 into the closed container 1 through the communication hole. On the other hand, the air is discharged from the cylinder 10 to the cup muffler 20 through the communication hole, and similarly through the through hole,
It is discharged into.

The gas discharged into the closed container 1 is a motor 2
It is discharged from the discharge pipe 22 to the outside through the inside. The oil is separated and returns to the oil sump B between the electric motor 2 and the sealed container 1.

By the way, in the case of the present invention, the lower first
The amount of eccentricity of the first eccentric portion 12 which rotates eccentrically in the cylinder 10 is set smaller than that of the second eccentric portion 11 on the upper side. Thereby, the mass eccentricity of the cylinder 10 is m1 × r1, and the mass eccentricity of the cylinder 9 is m2 × r2.
Then, m1 × r1 <m2 × r2...

The mass eccentricity of the balancer 28 is m4 ×
r4, cylinder 10 to cylinder 9 and balancer 28
Assuming that the respective distances to L2 and L4 are respectively, the weight and mounting position of the balancer 28 are selected, and eccentricity is set as follows: m1 × r1 + m4 × r4 = m2 × r2 ·· m4 × r4 × L4 = m2 × r2 × L2 ·· They are balanced (see Figure 2).

That is, the eccentric balance can be obtained without attaching a balancer normally attached to the lower end of the rotor 5 (m3 × r3 = 0, FIG. 2), and the balancer can be installed without increasing vibration and noise. , The number of parts can be reduced, the weight can be reduced, and the productivity can be improved.

FIG. 3 is a longitudinal sectional side view of another multi-cylinder rotary compressor C of the present invention. In this figure, the same reference numerals as those in FIG. In this case, the thickness dimension H1 of the lower first cylinder 50 (corresponding to the cylinder 10 in FIG. 1) is smaller than the thickness dimension H2 of the upper cylinder 9, and the first dimension is adjusted accordingly. Eccentric part 52
(Corresponding to the eccentric part 12 in FIG. 1), the first roller 54 (FIG.
The roller (corresponding to the roller 14) is also reduced in thickness (up and down) dimensions.

According to such a configuration, the relationship between the mass eccentricity m1 × r1 in the cylinder 50 and the mass eccentricity m2 × r2 in the cylinder 9 is represented by the above-mentioned m1 × r1 <m2 × r2.
The balancer 2 at the upper end of the rotor 5
Eccentricity balance can be obtained only with 8.

Here, the upper and lower cylinders 9, 50 (10)
The maximum bearing load will be generated in the lower bearing 16 due to the gas compression load in the above, but the lower cylinder 50 is made thinner, the eccentric amount of the eccentric part 52 is increased, and the outer diameter of the roller 54 is reduced. By reducing the load, the load on the cylinder 50 is reduced, and the compressive load generated therein is reduced to reduce the load on the bearing 16, thereby improving the reliability.

Next, FIG. 4 shows a vertical sectional side view of still another multi-cylinder rotary compressor C of the present invention. In this figure, the same reference numerals as those in FIG. In this case, the weight of the lower first eccentric portion 62 (corresponding to the eccentric portion 12 of FIG. 1) and the first roller 64 (corresponding to the roller 14 of FIG. 13 is lighter. As a method for reducing the weight, the amount of eccentricity is increased by making the eccentric portion 62 hollow inside. The thickness of the roller 64 may be reduced.

According to such a configuration, the first cylinder 10
The relationship between the mass eccentricity m1 × r1 of the second cylinder 9 and the mass eccentricity m2 × r2 of the second cylinder 9 is expressed as m1 × r1 <m2
.Times.r2..., So that the eccentric balance can be achieved only by the balancer 28 at the upper end of the rotor 5.

[0040]

As described in detail above, according to the present invention, the first
The mass eccentricity of the cylinder is m1 × r1, the mass eccentricity of the second cylinder is m2 × r2, the mass eccentricity of the balancer is m4 × r4, and each distance from the first cylinder to the second cylinder and the balancer is When L2 and L4 are respectively set, the above-mentioned m1 × r1 <m2 × r2 can be satisfied. Therefore, by selecting the weight and mounting position of the balancer, m1 × r1 + m4 × r4 = m2 × r2, m4
The eccentric balance can be obtained as xr4 x L4 = m2 x r2 x L2.

Accordingly, eccentric balance can be obtained without mounting a balancer which is usually mounted on the rotary compression element side of the rotor, so that the number of parts is reduced and the weight is reduced without increasing vibration and noise. Therefore, the productivity can be improved.

[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 diagram illustrating a relationship between mass eccentricity of a cylinder and a balancer in the multi-cylinder rotary compressor of the present invention.

FIG. 3 is a vertical sectional side view of a multi-cylinder rotary compressor according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional side view of a multi-cylinder rotary compressor according to still another embodiment of the present invention.

FIG. 5 is a vertical sectional side view of a conventional multi-cylinder rotary compressor.

FIG. 6 is a diagram illustrating the relationship between the mass eccentricity of a cylinder and a balancer in a conventional multi-cylinder rotary compressor.

[Explanation of symbols]

 C Multi-cylinder rotary compressor 1 Airtight container 2 Electric motor (Electric element) 3 Rotary compression element 4 Stator 5 Rotor 6 Rotary shaft 8 Intermediate partition plate 9, 10, 50 Cylinder 11, 12, 52, 62 Eccentric part 13, 14, 54, 64 Roller 15, 16 Bearing 28 Balancer

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Sawabe 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Midori Nikawame 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd. (72) Inventor Masazumi Sakaniwa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H029 AA04 AA09 AA13 AA21 AB03 BB21 BB32 CC02 CC07 CC09 CC30 5H615 AA01 BB01 BB04 BB14 PP01 PP12 PP24 PP28 QQ02 SS05 SS54

Claims (3)

[Claims] An electric element and a rotary compression element are housed in a sealed container, and the rotary compression element is provided with an intermediate partition plate, a second cylinder provided on the electric element side of the intermediate partition plate, and A first cylinder provided on the opposite side of the intermediate partition plate, and first and second cylinders whose rotation angles are shifted by 180 degrees from each other;
A rotating shaft having an eccentric portion and connected to the electric element,
First and second rollers respectively fitted in the first and second eccentric portions of the rotating shaft and rotating in the first and second cylinders, and bearings for closing respective openings of the respective cylinders And a multi-cylinder rotary compressor comprising the electric element, a stator, and a rotor supported on the rotating shaft and rotatable inside the stator. A balancer was attached only to the end of the rotor opposite to the rotary compression element, and the mass eccentricity of the first eccentric portion was set smaller than the mass eccentricity of the second eccentric portion. A multi-cylinder rotary compressor. 2. 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, a second cylinder provided on the electric element side of the intermediate partition plate, and A first cylinder provided on the opposite side of the intermediate partition plate, and first and second cylinders whose rotation angles are shifted by 180 degrees from each other;
A rotating shaft having an eccentric portion and connected to the electric element,
First and second rollers respectively fitted in the first and second eccentric portions of the rotating shaft and rotating in the first and second cylinders, and bearings for closing respective openings of the respective cylinders And a multi-cylinder rotary compressor comprising the electric element, a stator, and a rotor supported on the rotating shaft and rotatable inside the stator. A balancer is attached only to the end of the rotor opposite to the rotary compression element, and the first cylinder is
A multi-cylinder rotary compressor characterized by being thinner than the second cylinder. 3. 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, a second cylinder provided on the electric element side of the intermediate partition plate, and A first cylinder provided on the opposite side of the intermediate partition plate, and first and second cylinders whose rotation angles are shifted by 180 degrees from each other;
A rotating shaft having an eccentric portion and connected to the electric element,
First and second rollers respectively fitted in the first and second eccentric portions of the rotating shaft and rotating in the first and second cylinders, and bearings for closing respective openings of the respective cylinders And a multi-cylinder rotary compressor comprising the electric element, a stator, and a rotor supported on the rotating shaft and rotatable inside the stator. A multi-cylinder, wherein a balancer is attached only to the end of the rotor opposite to the rotary compression element, and the weight of the first eccentric portion is lighter than that of the second eccentric portion. Rotary compressor.