KR100447206B1 - Scroll compressor with outer rotor type motor - Google Patents

Abstract

An object of the present invention is to provide a scroll compressor equipped with an outer rotor type electric motor capable of significantly reducing the height of a device, and to replace the conventional subframe to reduce the product cost and the number of assembly processes.

To this end, the present invention, the case forming the exterior; A main frame fixed in the case and having a boss hole protruding downward from a center thereof, and a bearing hole formed at an upper side of the bearing hole, the thrust surface being stepped with a bearing hole; A stator fixed to a lower portion of the main frame and having a hollow central portion thereof; A rotor provided on the outer circumferential surface of the stator in a concentric manner with the stator; A part is fixed to the bottom part of the rotor, the other part is located in the bearing hole of the main frame, has an eccentric part on the upper part, protrudes along the boundary around the lower surface of the eccentric part to contact the thrust surface of the main frame A crank shaft having a thrust portion to be used; A turning scroll for turning by the eccentric portion of the crankshaft; It is fixed to the upper portion of the main frame provides a scroll compressor comprising a fixed scroll is engaged with the swing scroll to perform compression.

Description

Scroll compressor with outer rotor type motor

The present invention relates to a scroll compressor, and more particularly, to a scroll compressor having an outer rotor type electric motor to reduce the height of the device.

In general, a scroll compressor is a device that compresses refrigerant gas by changing a volume of a compression chamber formed by a pair of opposing scrolls, and has higher efficiency, lower vibration and noise than a reciprocating compressor and a rotary compressor. In addition, it is possible to lighten the weight, and the use area is gradually expanding.

Hereinafter, referring to FIG. 1, the configuration and operation of a conventional scroll compressor will be described.

First, the scroll compressor includes a case 1 in which oil is stored at a lower portion thereof, a main frame 2 fixed in the case and having a boss 2a protruding downward from the center thereof, and a bearing hole 2b formed therein; A crank shaft having an inner rotor type electric motor 3 provided below the main frame and the electric motor 3 and inserted into a bearing hole 2b of the main frame and having an eccentric portion 4a thereon. 4) and a swing scroll 5 for pivoting by the eccentric portion 4a of the crankshaft, and a fixed scroll 6 fastened to the main frame 2 to engage with the swing scroll to perform compression. The one side is fixed to the case 1 and the other side is provided at the lower end of the crankshaft 4 to include a subframe 9 supporting the crankshaft.

The inner rotor type electric motor 3 is fixed to the circumferential surface of the crankshaft 4 and is rotated together with the crankshaft, and is fixed to the case 1 and the rotor 3a. ) Is located at the center thereof, and its inner circumferential surface is composed of a stator 3b spaced apart from the outer circumferential surface of the rotor by a predetermined distance.

In addition, in order to offset the centrifugal force generated due to the eccentric portion 4a of the turning scroll 5 and the crankshaft being eccentric from the center of rotation, the eccentricity of the crankshaft eccentric portion 4a of the upper surface of the rotor 3a. The upper counterweight 7 is provided in the direction opposite to the direction, and the lower counterweight 8 is installed in the same direction as the eccentric direction of the crankshaft eccentric portion 4a of the lower surface of the rotor 3a.

The scroll compressor configured as described above rotates the crankshaft 4 while the rotor is rotated by application of power, and rotates the turning scroll 5 fastened to the eccentric portion 4a while the crankshaft rotates. After all, the refrigerant gas is compressed by the swinging motion of the swinging scroll 5.

However, the conventional scroll compressor made as described above has the following problems.

First, since the rotor 3a located on the lower side of the mainframe 2 is fixed to the circumferential surface of the crankshaft 4, which is the same position as the boss 2a of the mainframe, There is a structural limitation that the boss 2a and the rotor 3a of the mainframe occupy a space, respectively, so that the height of the device cannot be reduced.

Secondly, the upper counterweight 7 is located in the direction opposite to the eccentric direction of the crankshaft eccentric portion 4a of the upper surface of the rotor 3a, which is between the boss 2a of the mainframe and the upper surface of the rotor 3a. As it is located at, the size of the device is higher.

Third, the inner rotor type motor 3 in which the rotor 3a is located in the stator 3b has a rotor as compared to the outer rotor type motor in which the rotor (see 40 in FIG. 2) is positioned outside the stator (see 30 in FIG. 2). Since the outer diameter of (3a) is small, in order to cancel the eccentricity when the angular velocity (ω) of the counterweight is equal under the same conditions, the centrifugal force of the counterweight 7 Inevitably, the mass m is inevitably increased in proportion to the decrease in the distance r from the center of rotation of the rotor 3a to the center of gravity of the counterweight 7. In order to increase the mass, the size of the counterweight 7, that is, the height of the counterweight 7 must be increased under the same material, so that the height of the device has a structural limitation that can only be increased with the second problem.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a scroll compressor equipped with an outer rotor type electric motor capable of significantly reducing the height of a device, while reducing the cost of the product and the number of assembly processes. To replace the frame.

1 is a longitudinal sectional view showing a scroll compressor having an inner rotor type electric motor according to the prior art.

Figure 2 is a longitudinal sectional view showing a scroll compressor having an outer rotor type electric motor according to the present invention.

3 is a perspective view showing in detail the stator of FIG.

Figure 4 is a longitudinal sectional view showing another embodiment of a scroll compressor with an outer rotor type electric motor according to the present invention.

Explanation of symbols for main parts of the drawings

10: Case 20: Mainframe

21: boss 22: bearing hole

23: thrust surface 30: stator

30a: hollow portion 40: rotor

50: crankshaft 51: eccentric part

52: thrust part 70: thrust bearing

5: turning scroll 6: fixed scroll

In order to achieve the above object, the present invention, the case forming the exterior; A main frame fixed in the case and having a boss hole protruding downward from a center thereof, and a bearing hole formed at an upper side of the bearing hole, the thrust surface being stepped with a bearing hole; A stator fixed to a lower portion of the main frame and having a hollow central portion thereof; A rotor concentric with the stator on the outer circumferential surface of the stator and maintained in a predetermined gap; A part is fixed to the bottom part of the rotor, the other part is located in the bearing hole of the main frame, has an eccentric part on the upper part, protrudes along the boundary around the lower surface of the eccentric part to contact the thrust surface of the main frame A crank shaft having a thrust portion to be used; A turning scroll for turning by the eccentric portion of the crankshaft; It is fixed to the upper portion of the main frame provides a scroll compressor comprising a fixed scroll is engaged with the swing scroll to perform compression.

Here, the boss of the main frame is preferably located in the hollow portion of the stator in order to further reduce the height of the device.

The thrust surface or the thrust portion itself is preferably an oilless bearing to support the thrust acting in the crankshaft direction.

Therefore, according to the present invention, since the outer rotor-type electric motor having a rotor is provided on the outer circumferential side of the stator, the boss and the rotor of the main frame are provided at different positions, so that the height of the scroll compressor can be significantly reduced. In addition, the cost of the product can be reduced, and the space of the system can be more efficiently utilized when applied to other systems such as a refrigerator or an air conditioner. In addition, since the subframe, which is a conventional single component, is removed and its role is substituted for the thrust surface and the thrust portion, the product cost and the number of assembly processes can be reduced.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a longitudinal sectional view showing a scroll compressor having an outer rotor-type electric motor according to the present invention, Figure 3 is a perspective view showing in detail the stator of Figure 2, Figure 4 is a scroll with an outer rotor-type electric motor according to the present invention A longitudinal sectional view showing another embodiment of the compressor.

Prior to the drawings, the same reference numerals as those in the prior art are assigned to the same structures as in the prior art.

In the scroll compressor including the outer rotor type electric motor according to the present invention, as shown in FIG. 2, a case 10 forming an exterior is provided, and a main frame 20 is fixed in the case. The boss 21 protrudes downward from the center of the center 20, and a bearing hole 22 is formed, and a thrust surface 23 is stepped with a bearing hole in an upper side of the bearing hole 22 of the main frame 20. ) Is formed, and the stator 30 having a hollow central shape is screwed into the bottom surface of the main frame 20, and the rotor 40 is formed on the outer circumferential surface of the stator 30 by maintaining a predetermined void. It is provided.

In addition, the crankshaft 50 is positioned in the hollow portion 30a of the stator and the bearing hole 22 of the main frame, and the lower portion of the crankshaft 50 is fixed to the bottom of the rotor 40. The upper part of the crankshaft 50 is slidably provided in the bearing hole 22 of the main frame, and a predetermined amount of eccentricity is provided at an end portion located above the bearing hole 22 of the crankshaft 50. The thrust part 52 which has the eccentric part 51 which protrudes along the periphery with respect to the lower surface of the said eccentric part 51 among the crankshafts 50, and contacts the thrust surface 23 is formed. The upper portion of the main frame 20 is provided with a pivoting scroll 5 for pivoting by the eccentric portion 51 of the crankshaft so as to be movable, and the upper portion of the main frame 20. The fixed scroll (6) which performs compression by engaging with (5) is fixed The.

Here, the stator 30, as shown in FIG. 3, is formed by stacking a plurality of electrical steel sheet 31 having an empty central portion. Specifically, a plurality of slots 31a are formed radially on the outer circumferential surface of the electrical steel sheet 31, and screw fastening holes for fixing the stator to the bottom surface of the main frame 20 on the inner circumferential surface of the electrical steel sheet 31. 31b) is formed, and the slots 31a and the screw fastening holes 31b formed in the electrical steel sheets 31 are stacked to correspond to each other, and then coils 32 are wound around the slots.

In addition, the rotor 40, as shown in Figure 2, is formed with a rotor housing 41, the upper portion of which forms a body, the rotor conductor 42 is pressed into the inner peripheral surface of the rotor housing 41 Is done. In addition, the rotor conductor 42 is formed by stacking a plurality of electrical steel plates (not shown) like the stator 30. In addition, the bottom of the rotor housing 41 is fixed to the circumferential surface of the crankshaft 50.

On the other hand, the boss 21 of the main frame, as shown in Figure 2, in order to further reduce the height of the device is preferably located in the hollow portion 30a of the stator.

In addition, the thrust surface 23 and the thrust portion 52, as shown in Figure 2, to support the crankshaft 50 from gravity, the main frame 20 and the crankshaft ( It is formed integrally with 50), and replaces the role of the conventional subframe (see 9 of FIG. 1). Here, the thrust surface 23 or the thrust portion 52 is preferably an oilless bearing itself.

In addition, as shown in Figure 2, the rotor 40 is preferably provided with a balance weight (61, 62) for balancing the rotor during rotor rotation. Specifically, the upper counterweight 61 is integrally provided or separately mounted on the upper portion of the rotor housing 41 opposite to the eccentric direction of the crankshaft eccentric portion 51, and the rotor housing 41 The lower counterweight 62 is integrally provided or separately mounted on the lower side opposite to the upper counterweight 61.

1 and 2, the difference between the scroll compressor with an outer rotor type motor according to the present invention and the scroll compressor with an inner rotor type motor according to the prior art will be described in detail.

First, as the rotor 40 is provided at a position different from the boss 21 of the main frame, and the boss 21 of the main frame is located at the hollow portion 30a which is a position avoiding the upper surface of the stator 30, As the boss 21 of the frame is inserted into the hollow portion 30a of the stator, the overall height of the device can be reduced.

Second, since the rotor 40 is provided at a different position from the boss 21 of the mainframe, even if the counterweight 61 is installed on the upper surface of the rotor 40, the rotor 40 does not interfere with the boss 21 of the mainframe. The height of the device can be further reduced by the height.

Third, the outer rotor type electric motor applied to the present invention has a larger outer diameter of the rotor 40 than the conventional inner rotor type electric motor, so that the centrifugal force of the counterweight 61 for offsetting the eccentricity is It is possible to reduce the mass m in inverse proportion to the distance r from the center of rotation of the rotor 40 to the center of gravity of the counterweight 61. In other words, assuming that the same centrifugal force is obtained, the rotor 40 of the present invention has a relatively large outer diameter compared to the conventional rotor (see 3a in FIG. 1), thereby allowing a relatively low mass. Here, reducing the mass means that the size of the counterweight 61, that is, the height, can be reduced under the same material, and thus, the height of the device can be further reduced.

Fourth, since the outer diameter of the rotor 40 is larger than the conventional one, the torque can be made larger in proportion to the position of the gap between the inner circumferential surface of the rotor 40 and the outer circumferential surface of the stator 30.

Fifth, the thrust portion 23 formed on the crankshaft 50 and the thrust surface 23 formed on the main frame 20 are removed and the subframe (refer to 9 of FIG. 1), which is a conventional single component, is removed. As the 52 is replaced, the product cost and the number of assembly processes can be reduced.

On the other hand, at least one communication port 41a through which oil or gas can pass is preferably formed at the bottom of the rotor housing 41. That is, when the device starts to start up, oil (not shown) stored in the lower part of the case 10 rises up to the main frame 20 along the oil lift path 50a formed inside the crankshaft 50, and then lubricates the bearing part of the main frame side. In this case, the lubricated oil does not accumulate on the bottom of the rotor housing 41 so as to smoothly move to the bottom of the case 10, and also to allow the refrigerant gas to flow smoothly.

Meanwhile, as described above, the thrust face 23 and the thrust portion 52 are supported to support the crankshaft 50 from gravity, and the thrust acts in the crankshaft direction. The thrust surface and the thrust portion itself may be oilless bearings, but in another embodiment, as shown in FIG. 4, a separate thrust bearing 70 between the thrust surface 23 and the thrust portion 52. ) May be further provided to more preferably support the thrust acting in the axial direction. The same reference numerals as the reference numerals of FIG. 2 indicate the same members having the same function.

Therefore, by providing a scroll compressor equipped with an outer rotor type electric motor according to the present invention, it is possible to significantly reduce the height of the device, to reduce the unit cost of the product and to be applied to other systems such as refrigerators or air conditioners. The space of the city system can be utilized more efficiently. In addition, since the subframe, which is a conventional single component, is removed and its role is substituted for the thrust surface and the thrust portion, the product cost and the number of assembly processes can be reduced.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

As described above, the present invention has the following effects by providing a scroll compressor having an outer rotor type electric motor.

First, according to the present invention, as the height of the scroll compressor can be reduced, the cost of the product can be reduced and the space of the system can be used more efficiently when applied to other systems such as a refrigerator or an air conditioner. .

Second, according to the present invention, there is an advantage that can reduce the size of the counterweight compared to the prior art.

Third, according to the present invention, there is an advantage that can increase the torque compared to the prior art.

Fourth, according to the present invention, as the subframe, which is a conventional single component, is removed and its role is replaced by the thrust surface and the thrust portion, the product cost and the number of assembly processes can be reduced.

It also includes all the effects mentioned in the detailed description of the invention.

Claims (4)

A case forming an exterior; A main frame fixed in the case and having a boss hole protruding downward from a center thereof, and a bearing hole formed at an upper side of the bearing hole, the thrust surface being stepped with a bearing hole; It is fixed to the lower portion of the main frame, the center of the stator and the hollow shape, A rotor provided on the outer circumferential surface of the stator in a concentric manner with the stator; A part is fixed to the bottom part of the rotor, the other part is located in the bearing hole of the main frame, has an eccentric part on the upper part, protrudes along the boundary around the lower surface of the eccentric part to contact the thrust surface of the main frame A crank shaft having a thrust portion to be used; A turning scroll for turning by the eccentric portion of the crankshaft; And a fixed scroll fixed to an upper portion of the main frame to perform compression by engaging with the swinging scroll. The method of claim 1, The boss of the mainframe, the scroll compressor, characterized in that located in the hollow portion of the stator. The method according to claim 1 or 2, And the thrust surface or the thrust portion is an oilless bearing. The method according to claim 1 or 2, And a thrust bearing is further provided between the thrust surface and the thrust portion.