JP2002188569A - Hermetically enclose electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize separation of oil from gas without problems while miniaturizing a hermetic electric compressor. SOLUTION: In this hermetically enclosed electric compressor wherein an electric motor element 2 and a rotary compression element driven by a rotating shaft 6 connected to the electric motor element 2 are accommodated in a closed case, the electric motor element 2 is composed of a stator iron core fixed to an inner wall of the closed case 1 at its outer periphery and having plural tooth parts 75 and slots 78 alternately and continuously formed on its inner periphery, a stator winding 7 wound on each of the tooth parts 75 of the stator iron core and connected in three phases, and a rotor 5 mounted inside of the stator iron core 7, fixed to the rotating shaft 6, and having plural pairs of rare earth magnets 45 mounted oppositely to each other on the inner periphery of the stator iron core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic rotary compressor mounted on, for example, an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art A conventional hermetic rotary compressor 100 will be described with reference to FIGS. In each figure, 10
Reference numeral 1 denotes an airtight container, in which an electric motor (for example, a DC brushless motor) 102 is stored as an electric element on the upper side, and a compression element 103 rotatably driven by the electric motor 102 is stored 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. The electric motor 102 and the compression element are provided in the shell portion 101A. After storing 103, the end cap portion 101
B is placed on the shell portion 101A and sealed by high frequency welding or the like. Further, the bottom of the closed container 101 inside the shell portion 101A is an oil reservoir B.
Becomes

[0003] The electric motor 102 comprises a stator 104 fixed to the inner wall of the closed casing 101 and a rotor 105 rotatably supported around a rotating shaft 106 inside the stator 104. . The stator 104 is distributed over a stator 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 core 174. 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. Eccentric portions 111 and 112 that are driven to rotate by the rotating shaft 106 are attached to the respective cylinders 109 and 110, and the eccentric portions 111 and 112 are 180 degrees out of phase with each other in eccentric position.

[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 the first frame and the second frame, respectively.
The first frame 115 forms a closed compression space of the cylinder 109 with the partition plate 108, and the second frame 116 similarly forms the cylinder 11 with the partition plate 108.
A closed compression space of zero is formed. Further, the first frame 115 and the second frame 116 are provided with bearings 117 and 118, respectively, which rotatably support the lower part of the rotary shaft 106.

Reference numerals 119 and 120 denote cup mufflers, which are attached so as to cover the first frame 115 and the second frame 116, respectively. The cylinder 109 and the cup muffler 119 are communicated with each other through a communication hole (not shown) provided in the first frame 115, and the cylinder 110 and the cup muffler 120 are also connected with a communication (not shown) provided in the second frame 116. It is connected by a hole. Reference numeral 121 denotes a bypass pipe provided outside the closed container 101, and a cup muffler 120.
It communicates with the inside.

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.
5. A plurality of iron plates for a rotor punched in a shape as shown in FIG. 16 are laminated, and they are caulked together and 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 inserting magnetic bodies 145 (permanent magnets).
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 material 145 is made of a rare earth magnet material such as a praseodymium magnet or a neodymium magnet whose surface is nickel-plated, and has a rectangular cross section in its entirety. 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 plate-shaped end face member attached to the upper and lower ends, and is formed in a substantially disk shape from a nonmagnetic material such as stainless steel or brass. 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 is discharged into the closed vessel 101 from a discharge hole (not shown) formed in the cup muffler 119. On the other hand, from the cylinder 110, the cup muffler 120 is provided through the communication hole.
And is discharged into the closed container 101 via the bypass pipe 121.

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 the conventional hermetic rotary compressor 100, the stator winding 107 constituting the stator 104 of the electric motor 102 is of a distributed winding type.
As shown in FIG. 14, this stator winding 107 is
74, it projects relatively large up and down. For this reason, there is a problem that the vertical dimension of the sealed container 101 is also enlarged, and the overall size of the sealed rotary compressor 100 is increased.

Further, the gap inside the stator 104 in which the stator windings 107 are of the distributed winding type is narrowed as shown in FIG. Further, since the upper and lower ends of the concave portions 132 to 135 of the rotor 105 are closed by the end face members 166 and 167 and the plate 172, the concave portions 132 to 135 also do not contribute to the relaxation of the gas flow rate.

When the gas flow velocity is high, oil is difficult to separate, so that oil easily flows out from the discharge pipe 122. Further, since the stator winding 107 rises high outside the plate 172 as shown in FIG. 14, even if centrifugal force acts, it is difficult for the oil to go to the passage 177 side, which also reduces the oil separating effect. descend.

Therefore, conventionally, as shown in FIG. 14, it is necessary to secure a large space in the closed casing 101 above the stator winding 107 of the stator 104, which also increases the size of the sealed rotary compressor 100. Had been prompted.

On the other hand, in order to promote the flow of the oil into the oil sump B, the oil return passage 177 must be formed with a sufficient size. However, when the notch 176 becomes large, the outer circumference of the stator core 174 becomes larger. Surface and airtight container 101
The contact area with the (shell portion 101A) is reduced, and the strength of the sealed container 101 where the stator core 174 is not in contact is reduced. Therefore, there is also a problem that the closed container 101 is deformed to be depressed inward in the notch 176. Therefore, it is conceivable to form a through-hole in the outer peripheral portion of the stator core 174 without using the notch. However, the oil does not flow smoothly as compared with the case where the oil flows down the inner wall of the closed casing 101.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems, and it is an object of the present invention to reduce the size of a hermetic rotary compressor and to realize separation of oil from gas without hindrance. Aim.

[0025]

The hermetic rotary compressor according to the present invention comprises a hermetically sealed container containing an electric element and a rotary compression element driven by a rotary shaft connected to the electric element. In the hermetic rotary compressor, the electric element has a stator core having an outer periphery fixed to the inner wall of the sealed container and having a plurality of teeth and slots alternately and continuously arranged on the inner periphery thereof,
A stator winding wound around each tooth of the stator core and three-phase connected, and arranged inside the stator core and fixed to the rotating shaft and arranged facing the inner periphery of the stator core And a rotor having a plurality of pairs of rare earth magnets.

Further, the number of teeth is 6, and two pairs of rare earth magnets are provided.

Further, a plurality of concave passages extending over both upper and lower end surfaces of the stator core are provided at predetermined intervals between the stator core and the closed container.

Further, the rotary compression element is housed in the bottom of the sealed container, the electric element is arranged above it, and a discharge pipe is attached to the upper wall of the sealed container. When the distance to the lower surface of the upper wall is L1 and the vertical dimension of the stator winding of the electric element is L2, the range is set to 0.3 ≦ L1 / (L1 + L2) ≦ 0.6.

[0029] The hermetic container is composed of a shell part, which houses the electric element and the rotary compression element, which is open at one end, and an end cap part which closes the opening of the shell part. Is SH, and the distance from the stator core to the edge of the end cap portion is T, where 0.15 <T / SH <0.5.

Further, the passage area of the stator core is set to 3.8% or more of the inner peripheral cross-sectional area of the closed vessel.

[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 compressor C to which the present invention is applied. In this figure, reference numeral 1 denotes a closed container, in which an electric motor 2 is housed on the upper side as an electric element, and a compression element 3 rotated by the electric motor 2 is housed on the lower side. The closed container 1 has a cylindrical shell 1 having an open upper end.
A and an end cap portion 1B for closing the upper end opening of the shell portion 1A.
After the electric motor 2 and the compression element 3 are accommodated in A, the end cap 1B is put on the shell 1A and sealed by high frequency welding or the like. The bottom of the sealed container 1 in the shell portion 1A is an oil reservoir B.
Becomes

The electric motor 2 is a so-called DC brushless motor of a magnetic pole concentrated winding type, and has a stator 4 fixed to the inner wall of the sealed container 1 and rotatably supported inside the stator 4 about a rotation shaft 6. And a rotator 5 formed.
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. The stator winding 7 is directly wound around the tooth portion 75 using the space of the slot portion 78 to form a magnetic pole of the stator 4 by a so-called concentrated series winding method. The stator 4 is constituted.

By adopting such a magnetic pole concentrated winding type DC brushless motor as the electric motor 2, the size of the stator winding 7 projecting up and down from the stator core 74 is significantly larger than the conventional one (FIG. 14). Scaled down. Further, as shown in FIG. 3, the cross-sectional area of the slot portion 78 of the stator core 74 is also increased, so that the vertically penetrating gap G formed inside the stator 4 as shown in FIG. It has been significantly expanded.

The dimensional relationship between the stator 4 and the sealed container 1 will be described later in detail.

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 the rotation of the eccentric portions 11 and 12, respectively. Reference numerals 15 and 16 denote a first frame and a second frame, respectively. The first frame 15 forms a closed compression space of the cylinder 9 with the partition plate 8, and the second frame 16 Similarly, a closed compression space of the cylinder 10 is formed between the partition 10 and the partition plate 8. In addition, the first frame 15 and the second frame 16 each have a bearing 17 that rotatably supports the lower part of the rotary shaft 6.
18 are provided.

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

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 iron plate for the rotor of the rotor 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 the respective salient poles. 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 inserting magnetic bodies 45 (permanent magnets). The slots 41 to 44 correspond to the salient pole portions 28 to 31, and are arranged 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 core 26, and the rotary 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 which are attached to the upper and lower ends of the rotor core 26 and are made of a plate made of a nonmagnetic material such as stainless steel or brass, and have substantially the same shape as the rotor core 26. Notches 81... Are formed at positions corresponding to the concave portions 32 to 35 so that
Similar air holes 82 are formed at positions corresponding to 1 to 64 (FIG. 5).

The end members 66 and 67 are also provided with through holes 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).

In this 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 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 cylinder 9 into the cup muffler 19 through the communication hole, and from the discharge holes 83, 83 (FIG. 7) formed in the cup muffler 19, the closed container 101 located above. It is discharged into. on the other hand,
The cup muffler 2 is provided from the cylinder 10 through the communication hole.
0, enters the cup muffler 19 through the through hole 79, and is similarly discharged from the discharge holes 83, 83 into the upper sealed container 1.

The discharged high-pressure gas is supplied to the gap G in the stator 4 of the electric motor 2 or the stator core 7 as shown by an arrow in FIG.
Gap between the rotor 4 and the rotor 5, the concave portion 3 of the rotor core 26
2 to 35, the air holes 61 to 62 and the notches 81 of the end face members 66 and 67, the air holes 82, and so on. Then, the gas hits the plate 72 and moves outward by centrifugal force, the gas is discharged from the discharge pipe 22, and the oil flows down through the passage 77, and returns to the oil reservoir B at the bottom of the sealed container 1.

As described above, the relatively large gap G in the stator 2 and the concave portions 32 to 3 of the rotor core 26 are provided in the electric motor 2.
5, the notches 81... Of the end face members 66 and 67, and the air holes 82 are formed, so that the rising gas flow rate is relatively low. Therefore, gas and oil are easily separated.

Since the motor is of the magnetic pole concentrated winding type, the size of the stator winding 7 projecting upward from the stator core 74 is smaller than that of the conventional motor. Therefore, the oil flowing outward from the plate 72 easily passes over the stator winding 7, hits the inner wall of the closed casing 1 and goes to the passage 77.

As a result, it is not necessary to secure a large space for oil separation in the sealed container 1, and the overall size of the sealed rotary compressor C can be reduced along with the downsizing of the motor 2 itself. Becomes

Here, FIG. 8 shows the distance L1 from the upper end of the stator winding 7 of the motor 2 to the lower surface of the upper wall of the end cap 1B of the closed casing 1, and the length of the stator winding 7 of the stator 4 of the motor 2. When the vertical dimension is L2, the total height L of the hermetic rotary compressor 1 when L1 / (L1 + L2) is variously changed.
And the oil discharge amount from the discharge pipe 22. Each value is expressed as a ratio when the total height L of a conventional hermetic rotary compressor using an AC motor as an electric motor is 100 and the oil discharge amount is 100.

The DC brushless motor in the figure indicates each value in the case of the conventional hermetic rotary compressor 100 shown in FIG.

As is clear from this figure, the space inside the sealed container 1 above the stator 4 is reduced to perform L1 / (L
When (1 + L2) becomes 0.3, the total height L is reduced to 77% of that of the AC motor-sealed rotary compressor, but the oil discharge amount is increased to 90% (the conventional DC motor-sealed rotary compressor 100 is also 90%). %).

On the other hand, when the space inside the sealed container 1 above the stator 4 is enlarged, and L1 / (L1 + L2) becomes 0.6, the total height L becomes equal to that of the AC motor-sealed rotary compressor. It is equivalent (100%), but the oil discharge is drastically reduced to 8%.

Therefore, in the embodiment, 0.3 ≦ L1 / (L1
+ L2) ≦ 0.6.
Thereby, the height of the hermetic rotary compressor C is remarkably reduced while the oil discharge amount from the hermetic container 1 is made equal to the conventional one, or while the height of the hermetic rotary compressor C is made equal to the conventional one, The oil discharge amount can be significantly reduced.

The lowermost stage in FIG. 8 shows the inner peripheral cross-sectional area Y of the sealed container 1 of the total passage area (passage area vertically communicated) X of the stator 4 portion including the area of the passage 77 and the gap G. The ratio is shown.

That is, X = the area of the passage 77 + the area of the gap G Y = the inner peripheral cross-sectional area of the closed container 1 The ratio of the lowermost stage in FIG. 8 = X / Y × 100 (%) The sealing above the stator 4 When the ratio of the total height L is reduced to 77% by reducing the space in the container 1, if the ratio is 3.8% or more, the oil discharge amount becomes equal to or less than the conventional amount (less than the AC motor). . Therefore, in the embodiment, the above ratio is set to 3.8% or more.

In particular, the passage area of the gap G is set larger than the area of the passage 77. In the example of FIG. 2, the area of the gap G is 266.4 square millimeters, and the area of the passage 77 is 24.
6.0 square millimeters.

FIG. 9 shows another embodiment of the rotor 5. In this case, in the rotor core 26, through holes 84, 84 penetrating vertically through the rotor core 26 and the end face members 66, 67 are formed at positions corresponding to the upper side of the discharge holes 83, 83 of the cup muffler 19. I have. This allows the gas discharged from the discharge holes 83, 83 to smoothly flow into the through holes 61 to 64 as shown by the arrows in FIG. 9 and to rise, so that the gas flow rate is further reduced to improve the oil separation property. It can be further improved.

FIGS. 10 and 11 show another embodiment of the stator 4. FIG. In this case, the cutouts 76 formed at six locations on the outer peripheral surface of the stator core 74 have a concave shape in which the cross-sectional shape is narrower and narrower on the outer peripheral side of the stator 4 and the inner side is wider in an elliptical shape, as shown in each figure. The outer peripheral surface of the stator core 74 other than the constricted portion comes into contact with the inner wall of the shell 1B of the closed casing 1.

As a result, a passage 77 is formed in the notch 76 in which the cross-sectional shape is narrow on the outer peripheral side of the stator 4 and wide on the inner side, so that the area of the passage 77 for returning oil is widened. However, the contact area between the stator 4 and the sealed container 1 can be increased. In particular, since the area of one non-contact portion can be reduced, inconveniences such as the closed container 1 being depressed inward can be avoided.

In this case, since the passage 77 communicates with the inner wall of the shell 1B, the oil can smoothly flow down the inner wall.

Next, FIG. 12 shows another embodiment of the hermetic rotary compressor C of the present invention. In this case, a bypass pipe 21 is attached to the outside of the closed casing 1, and the bypass pipe 21 communicates the through hole 79 with the space inside the closed casing 1 below the electric motor 2. Thereby, the gas discharged to the cup muffler 20 also flows into the bypass pipe 21 and is discharged horizontally from the upper end outlet to the lower side of the electric motor 2. In the drawing, the same reference numerals as those in FIG. 1 perform the same or similar functions, and the dimensional relationship between L1 and L2 is also set as in FIG.

However, in this case, in addition to FIG.
0.15 <T / SH <0.5, where SH is the stack thickness of the stator core 74 and T is the distance from the stator core 74 to the lower end edge (indicated by 1BB) of the end cap portion 1B. Each dimension is set as follows.

Here, since the motor of the magnetic pole concentrated winding type has a small number of slots, the cogging torque is large and the motor vibration is also large. This motor vibration is transmitted to the sealed container 1 and transmitted to the outside as noise.
The vibration of the closed container 1 increases as the distance T from the lower end 4 to the lower end edge 1BB of the end cap portion 1B increases.

This situation is shown in FIG. That is,
It can be seen that the sound pressure level increases when the distance T increases and T / SH = 1. Therefore, by setting the dimension range as in the embodiment, the vibration of the sealed container 1 itself can be suppressed, and the noise can be reduced. In order to reduce noise, there is a method of increasing the height of the end cap portion 1B. However, this method cannot be adopted because the height of the hermetic rotary compressor C is increased.

The lower limit of 0.15 is determined within the practical range of the structure. Further, such a dimensional relationship is naturally applied to the embodiment of FIG.

[0072]

As described above in detail, according to the present invention, in a hermetic rotary compressor, an electric element is provided with an outer periphery fixed to an inner wall of a closed container and a plurality of teeth and slots on the inner periphery. A stator core having alternately and continuously, a stator winding wound around each tooth portion of the stator core and three-phase connected, and arranged inside the stator core and fixed to the rotating shaft. By comprising a rotor having a plurality of pairs of rare earth magnets arranged opposite to the inner circumference of the stator core,
The protrusion dimension of the stator winding from the stator core in the rotation axis direction is reduced, and the oil separating effect is also improved.

As a result, it is not necessary to secure a large space for oil separation in the sealed container, and the overall size of the sealed rotary compressor can be reduced together with the downsizing of the electric element itself. It becomes.

Further, a plurality of concave passages extending at both upper and lower ends are formed at predetermined intervals on the outer peripheral surface of the stator and are brought into contact with the inner wall of the sealed container. Inconveniences such as deformation of the container can be avoided.

Further, the rotary compression element is housed in the bottom of the sealed container, the electric element is disposed above the rotary compression element, and a discharge pipe is attached to the upper wall of the sealed container. When the distance to the lower surface of the upper wall is L1 and the vertical dimension of the stator of the electric element is L2, if each dimension is set so that 0.3 ≦ L1 / (L1 + L2) ≦ 0.6, sealing Reducing the height of the hermetic rotary compressor significantly while keeping the oil discharge amount from the container equal to the conventional one, or significantly reducing the oil discharge amount while keeping the height size of the hermetic rotary compressor the same as before Is what you can do.

The hermetically sealed container is composed of a shell having an open end, which accommodates the electric element and the rotary compression element, and an end cap which closes the opening of the shell, and a stator core of a stator of the electric element. Is SH, and the distance from the stator core to the edge of the end cap portion is T. Since each dimension is set so that 0.15 <T / SH <0.5, the cogging torque is set. Therefore, even when a magnetic pole concentrated winding type motor, which tends to increase the vibration, is used, the vibration of the sealed container itself can be suppressed and the noise can be reduced.

Further, since the passage area in the stator core is set to 3.8% or more of the inner peripheral cross-sectional area of the sealed container, the oil discharge amount can be further reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a hermetic rotary compressor according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of the hermetic rotary compressor shown in FIG.

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

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

FIG. 5 is a bottom view of a rotor of the hermetic rotary compressor shown in FIG.

FIG. 6 is a top view of a rotor of the hermetic rotary compressor shown in FIG.

FIG. 7 is an enlarged vertical sectional side view of a motor portion of the hermetic rotary compressor shown in FIG.

FIG. 8 is a diagram showing the relationship between the total height of the hermetic rotary compressor and the oil discharge amount when L1 and L2 in FIG. 1 are changed.

FIG. 9 is an enlarged sectional view of an electric motor portion of a hermetic rotary compressor according to another embodiment of the present invention.

FIG. 10 is a plan sectional view of a hermetic rotary compressor according to another embodiment of the present invention.

FIG. 11 is a plan view of a stator core and a rotor core of the hermetic rotary compressor shown in FIG.

FIG. 12 is a vertical sectional side view of a hermetic rotary compressor according to yet another embodiment of the present invention.

FIG. 13 is a diagram illustrating noise values when SH and T in FIG. 12 are changed.

FIG. 14 is a vertical sectional side view of a conventional hermetic rotary compressor.

FIG. 15 is a plan sectional view of the hermetic rotary compressor shown in FIG.

FIG. 16 is a plan view of a stator core and a rotor core of the hermetic rotary compressor of FIG. 15;

[Explanation of symbols]

 C Compressor 1 Airtight container 1A Shell part 1B End cap part 2 Motor 4 Stator 5 Rotor 6 Rotating shaft 7 Stator winding 26 Rotor core 32-35 Concave part 66, 67 End face member 74 Stator core 76 Notch 77 Passage 81 Notch

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 19/10 H02K 19/10 A 5H621 21/14 21/14 M 5H622 (72) Inventor Go Higuchi Keihan, Moriguchi-shi, Osaka 2-5-5 Hondori Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Dai Matsuura Osaka 2-5-5 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (72) Inventor Arisa Sato 2-5-5 Keihanhondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Hashimoto Akira 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term (reference) in Sanyo Electric Co., Ltd. 3H003 AA05 AB04 AC03 AD01 BG08 CD01 CF04 5H605 AA01 BB07 BB17 CC01 CC02 CC03 CC04 CC05 CC08 CC09 CC10 DD09 DD11 EA06 5H607 BB01 BB07 BB14 FF07 5H609 BB03 BB19 PP02 PP05 PP06 PP07 PP08 PP09 PP10 PP11 QQ01 QQ10 QQ13 QQ16 RR27 RR37 RR42 5H619 AA03 BB01 BB06 BB13 BB24 PP01 PP02 PP04 PP08 PP10 PP14 5H621 GA04 HH01 JK11 JK13 5H622 AA03 CA02 CA10 CA13 CB03 CB05 DD02 PP10

Claims (6)

[Claims] 1. A hermetic rotary compressor in which an electric element and a rotary compression element driven by a rotary shaft connected to the electric element are housed in a closed container, wherein the electric element is provided in the hermetic container. A stator core having an outer periphery fixed to the inner wall of the container and having a plurality of teeth and slots alternately and continuously arranged on the inner periphery thereof; and a three-phase connection wound around each tooth of the stator core. And a rotor having a plurality of pairs of rare-earth magnets arranged inside the stator core and fixed to the rotating shaft and opposed to the inner periphery of the stator core. A hermetic electric compressor characterized by comprising. 2. The method according to claim 1, wherein the number of teeth is six and the rare earth magnet is two.
2. The hermetic electric compressor according to claim 1, wherein the hermetic electric compressor is a pair. 3. The hermetic rotary compressor according to claim 2, wherein a plurality of concave passages extending over both upper and lower end surfaces of the stator core are provided at predetermined intervals between the stator core and the hermetic container. . 4. The rotary compression element is housed in a bottom portion of the closed container, and the electric element is disposed above the rotation compression element.
A discharge pipe is attached to the upper wall of the closed container, the distance from the upper end of the stator winding of the electric element to the lower surface of the upper wall of the closed container is L1, and the vertical dimension of the stator winding of the electric element is L.
4. The hermetic rotary compressor according to claim 3, wherein when the number is set to 2, the range is set to 0.3 ≦ L1 / (L1 + L2) ≦ 0.6. 5. The hermetic container includes a shell part that houses the electric element and the rotary compression element, one end of which is open, and an end cap part that closes the opening of the shell part, and a stator of the electric element. The thickness of the core is SH, and the distance from the stator core to the edge of the end cap is T.
5. The hermetic rotary compressor according to claim 4, wherein 0.15 <T / SH <0.5. 6. The hermetic rotary compressor according to claim 5, wherein a passage area in the stator core is set to 3.8% or more of an inner peripheral cross-sectional area of the hermetic container.