KR20210014574A - Scroll compressor - Google Patents

Abstract

Disclosed is a scroll compressor which extends a compression space, thereby increasing a design volume ratio. The scroll compressor comprises: a main body; a fixed scroll fixed in the main body; a rotating scroll provided to perform a rotating motion with respect to the fixed scroll; and a compression unit provided on the fixed scroll and the rotating scroll. The compression unit includes: an arc unit having prescribed curvature; a curve unit arranged inside the arc unit to be separated from the arc unit by a prescribed distance; and a connection unit connecting the arc unit and the curve unit, and having curvature changing from the arc unit to the curve unit.

Description

Scroll compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor.

The scroll compressor includes a fixed scroll having a fixed wrap, and an orbiting scroll having an orbiting wrap corresponding to the wrap of the fixed scroll, and the orbiting scroll continuously moves between the fixed wrap and the orbiting wrap while rotating relative to the fixed scroll. It is a compressor that sucks and compresses refrigerant by forming a moving compression chamber.

Since such a scroll compressor continuously performs suction, compression, and discharge, it has superior advantages over other types of compressors in terms of vibration and noise generated during operation.

In general, in the orbiting scroll of a scroll compressor, a orbiting wrap is formed on one side of a disk-shaped hard plate, and a boss part is formed on the other side of the hard plate on which the orbiting wrap is not formed. Are combined. This type of scroll compressor has the advantage of reducing the diameter of the hard plate since it can form a revolving wrap over the entire area of the hard plate. However, the action point at which the repulsive force of the refrigerant is applied during compression and the action point at which the reaction force to cancel the repelling force is applied are separated, so that the behavior of the orbiting scroll may become unstable during the operation process, and this may increase the vibration or noise of the scroll compressor. I can.

As an alternative to the scroll compressor described above, there is a through-shaft scroll compressor or a semi-axial scroll compressor in which an action point to which a repulsive force of a refrigerant is applied and an action point for canceling the repulsive force are formed at the same point. In the through-shaft scroll compressor or the semi-axial scroll compressor, since the action point of the repelling force of the refrigerant and the action point of the reaction force act at the same point, it is possible to prevent the orbiting scroll from tilting with respect to the rotation axis.

However, in the through-shaft scroll compressor or the semi-axial through-scroll compressor, since the rotating shaft must be inserted in the center of the hard plate, the orbiting wrap cannot be formed over the entire area of the hard plate. Due to this, the compression space of the compression chamber is reduced, and further, the design volume ratio of the scroll compressor can be reduced.

An aspect of the present invention provides a scroll compressor with an increased design volume ratio by changing the shape of the wrap.

Another aspect of the present invention provides a scroll compressor in which a compression space is expanded by changing a shape of a wrap.

Another aspect of the present invention provides a through-axis scroll compressor or a through-axis scroll compressor with an increased design volume ratio including a wrap structure of a new shape.

According to the idea of the present invention, a scroll compressor includes a main body, a fixed scroll fixed to the inside of the main body, an orbiting scroll provided to orbital movement with respect to the fixed scroll, and a compression provided in the fixed scroll and the orbiting scroll, respectively. Including a portion, wherein the compression portion is an arc portion having a constant curvature, a curved portion disposed inside the arc portion so as to be spaced apart from the arc portion by a predetermined distance, and a connection portion connecting the arc portion and the curved portion, from the arc portion It may include a connection portion having a curvature that changes to the curved portion.

The shape of the curve formed by the connection portion may be any one of a cosine curve, a Bezier curve, a Hermite curve, and a B-spline curve.

The included angle between the first line segment connecting one end of the connection unit and the center of the compression unit and the second line segment connecting the other end of the connection unit and the center of the compression unit may be 100° or more.

When the curved portion is provided in an arc shape having a constant curvature, the arc portion may be referred to as a first arc portion, and the curved portion may be referred to as a second arc portion.

The first arc portion and the second arc portion may each have a constant thickness, and the thickness of the first arc portion and the second arc portion may be the same.

The scroll compressor may further include a rotation shaft that rotates about a rotation axis, and includes an eccentric portion eccentric from the rotation axis, and the eccentric portion further includes a rotation shaft disposed in parallel with the compression portion in a direction crossing the rotation axis. have.

The compression unit may further include a shaft coupling unit disposed inside the second arc unit to be spaced apart from the second arc unit by a predetermined distance, and to which the eccentric unit is coupled.

The shaft coupling portion may include a third arc portion that forms an outer surface of the shaft coupling portion and has a constant curvature.

A distance between the first arc portion and the second arc portion and a distance between the second arc portion and the third arc portion may be the same.

The connecting portion is a curvature that connects the first connecting portion connecting the first arc portion and the second arc portion, the second arc portion and the third arc portion, and changes from the second arc portion to the third arc portion It may include a second connection having a.

The first arc portion and the second arc portion may each include an outer surface and an inner surface, and the third arc portion may include an outer surface.

The first connection portion includes a first connection surface connecting an outer surface of the first arc portion and an outer surface of the second arc portion, and a second connection surface connecting an inner surface of the first arc portion and an inner surface of the second arc portion can do.

The second connection portion may include a third connection surface connecting an outer surface of the second arc portion and an outer surface of the third arc portion.

A first angle, which is an angle between a line segment connecting one end of the first connection surface and the center of the compression unit, and a line segment connecting the other end of the first connection surface and the center of the compression unit, and one end of the second connection surface and the The line segment connecting the center of the compression unit and the second angle, which is an angle between the line segment connecting the center of the compression unit to the other end of the second connection surface, and the line segment connecting the center of the compression unit to one end of the third connection surface, and the A third angle, which is an enclosed angle of a line segment connecting the other end of the third connection surface and the center of the compression unit, may be different from each other.

The first angle may be 95°, the second angle may be 115°, and the third angle may be 135°.

The distance from the center of the compression part to the connection part is R, the distance from the center of the compression part to the first arc part is R₁, the distance from the center of the compression part to the second arc part is R2, and the thickness of the circular arc part t, the distance at which the center of the eccentric part is eccentric from the center of the rotation shaft is ε, the angle of one end of the first arc with respect to a predetermined reference line is θ₁, and the angle of one end of the second arc with respect to the reference line is θ₂, when the angle to a point of the connection with respect to the reference line is θ,

가 성립할 수 있다.

Can be established.

The center of the shaft coupling portion may be disposed to be shifted from the center of the compression portion.

The shape of the curved portion may be provided as an involute curve having a center offset from the center of the fixed scroll or the orbiting scroll.

According to the idea of the present invention, a scroll compressor includes a main body, a fixed scroll fixed to the inside of the main body, an orbiting scroll provided to orbital movement with respect to the fixed scroll, and a compression provided in the fixed scroll and the orbiting scroll, respectively. A portion including a portion, and the compression portion is a first arc portion having an arc shape, and a second arc portion having the same center as the first arc portion and disposed inside the first arc portion, and the first arc portion and the thickness are The same second arc portion, as a connection portion connecting the first arc portion and the second arc portion, may include a connection portion continuously changing a curvature from the first arc portion to the second arc portion.

The shape of the curve formed by the connection portion may be a cosine curve.

The included angle between the first line segment connecting one end of the connection unit and the center of the compression unit and the second line segment connecting the other end of the connection unit and the center of the compression unit may be 100° or more.

The scroll compressor may further include a rotation shaft that rotates about a rotation axis, and includes an eccentric portion eccentric from the rotation axis, and the eccentric portion further includes a rotation shaft disposed in parallel with the compression portion in a direction crossing the rotation axis. .

The distance from the center of the compression part to the connection part is R, the distance from the center of the compression part to the first arc part is R₁, the distance from the center of the compression part to the second arc part is R₂, and the first arc part The thickness is t, the distance at which the center of the eccentric part is eccentric from the center of the rotation shaft is ε, the angle of one end of the first arc with respect to a predetermined reference line is θ₁, and the end of the second arc with respect to the reference line When the angle is θ₂, and the angle to one point of the connection with respect to the reference line is θ,

가 성립할 수 있다.

Can be established.

According to the idea of the present invention, the scroll compressor includes a main body, a fixed scroll fixed to the inside of the main body, and including a first plate and a fixed wrap formed on the first plate, and a rotating motion with respect to the fixed scroll. And a second diaphragm facing the first diaphragm, and a orbiting scroll including a orbiting wrap and a shaft connecting portion formed on the second diaphragm, and an eccentric portion eccentric from the rotating shaft, and coupled to the shaft connecting portion A rotating shaft, wherein the eccentric portion includes a rotating shaft disposed to pass through the second diaphragm, and the orbiting wrap includes an arc-shaped first arc portion and an inner side of the first arc portion to be spaced apart from the first arc portion. It may include a second arc portion disposed at, and a connection portion connecting the first arc portion and the second arc portion, and having a curvature changing from the first arc portion to the second arc portion.

According to the idea of the present invention, it is possible to provide a scroll compressor with an increased design volume ratio by changing the shape of the wrap.

According to the idea of the present invention, it is possible to provide a scroll compressor in which the compression space is expanded by changing the shape of the wrap.

According to the idea of the present invention, it is possible to provide a through-axis scroll compressor or a through-axis scroll compressor with an increased design volume ratio including a wrap structure of a new shape.

1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.
2 is a plan view of an orbiting scroll in a scroll compressor according to an embodiment of the present invention.
3 is a diagram schematically illustrating the orbiting scroll shown in FIG. 2.
4 is a graph showing the distance from the center of the orbiting scroll to the orbiting wrap in the scroll compressor according to an embodiment of the present invention.
5 is a graph showing an enlarged portion of the graph of FIG. 4.
6 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.
7 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.
8 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.
9 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.
10 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.
11 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.
12 is a plan view of a fixed scroll corresponding to the orbiting scroll shown in FIG. 11.

The embodiments described in the present specification and the configurations shown in the drawings are only preferred examples of the disclosed invention, and there may be various modifications that may replace the embodiments and drawings of the present specification at the time of filing of the present application.

In addition, terms used in the present specification are used to describe the embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It does not preclude the presence or addition of elements, numbers, steps, actions, components, parts, or combinations thereof.

In addition, terms including ordinal numbers such as “first” and “second” used in the present specification may be used to describe various elements, but the elements are not limited by the terms, and the terms are It is used only for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

The terms "top", "rear", "top", "bottom", "top" and bottom" used in the following description are defined based on the drawings, and the shape and position of each component It is not limited.

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

The scroll compressor 1 includes a main body 10, a fixed scroll 20 fixed inside the main body 10, an orbiting scroll 100 and a fixed scroll 20 provided to orbital movement with respect to the fixed scroll 20 And compression units 22 and 102 provided on the orbiting scroll 100, respectively, and a driving motor 30 that drives the orbiting scroll 100.

The main body 10 includes an upper cap 11 and a lower cap 12 that are respectively mounted on the upper and lower portions of the main body 10 to seal the inside of the main body 10, and a suction pipe 13 provided to allow refrigerant to flow in. , It may include a discharge pipe 14 provided to be discharged to the outside of the main body 10 after the refrigerant sucked through the suction pipe 13 is compressed.

The fixed scroll 20 includes a first end plate 21 having a disk shape, and a fixed wrap 22 extending downward from the first end plate 21 and forming a compression chamber together with a turning wrap 102 to be described later. can do.

The orbiting scroll 100 includes a second disc 101 in the shape of a disk disposed to face the first diaphragm 21, and extending upward from the second diaphragm 101 and forming a compression chamber together with the fixing wrap 22. It may include a pivot wrap 102 to form. In addition, the orbiting scroll 100 may include a shaft coupling portion 130 provided to insert the eccentric portion 42 of the rotating shaft 40 to be described later.

Hereinafter, the compression units 22 and 102 may refer to including the orbiting wrap 102 of the orbiting scroll 100 and the fixing wrap 22 of the fixed scroll 20. That is, the compression unit may refer to both a turning wrap and a fixed wrap.

The fixed wrap 22 of the fixed scroll 20 and the orbiting wrap 102 of the orbiting scroll 100 may be engaged to form a compression chamber 50. The compression chamber 50 is formed by the fixed scroll 20 and the orbiting scroll 100, and the volume is reduced by the orbiting motion of the orbiting scroll 100. Due to this, the refrigerant sucked into the compression chamber 50 may be compressed.

The refrigerant compressed by entering the compression chamber 50 becomes a high-pressure refrigerant and is discharged, and the refrigerant inside the compression chamber 50 moves the orbiting scroll 100 in a direction away from the fixed scroll 20. You can pressurize.

Since the pressure inside the compression chamber 50 acts in a direction away from the orbiting scroll 100 from the fixed scroll 20, the orbiting scroll 100 is directed toward the fixed scroll 20 at the lower portion of the orbiting scroll 100. A back pressure chamber 18 for transmitting pressure may be provided.

A refrigerant may be filled in the back pressure chamber 18. The back pressure chamber 18 may be formed by the main frame 15, the rotating shaft 40, and the orbiting scroll 100.

An Oldham ring 17 for rotating the orbiting scroll 100 without rotating it may be provided between the orbiting scroll 100 and the main frame 15.

The main frame 15 and the sub-frame 16 are fixed to the upper and lower portions of the body 10, respectively, and a driving motor 30 may be disposed between the main frame 15 and the sub-frame 16. .

The drive motor 30 may include a stator 31 constituting a stator and a rotor 32 constituting a rotor.

The stator 31 may include a stator body 311 and a coil 312 wound around the stator body 311.

The stator body 311 is a laminate in which a large number of electromagnetic steel sheets are stacked, and has a schematic shape of a cylindrical shape. The diameter of the outer circumferential surface of the stator body 311 is formed larger than the diameter of the inner circumferential surface of the casing 10, and the stator main body 311 may be fitted into the casing 10 by force fitting.

The stator body 311 may have a plurality of teeth (not shown) in a circumferential direction at an inner portion facing the outer periphery of the rotor 32. The coil 312 may be disposed in a slot (not shown) existing between adjacent teeth.

The rotor 32 may be a laminate in which a plurality of ring-shaped electronic steel sheets are stacked. The diameter of the inner circumferential surface of the rotor 32 may be smaller than the diameter of the outer circumferential surface of the rotating shaft 40. It is possible to fit the rotating shaft 40 to the rotor 32 by forcefully fitting. As a method of inserting the rotating shaft 40 into the rotor 32, press-fitting can be illustrated. Due to this, the rotating shaft 40 can rotate together with the rotor 32.

The rotating shaft 40 includes a main shaft 41 that is fitted to the rotor 32 and an eccentric part 42 provided on the upper part of the main shaft 41 and having an axial center eccentric from the axial center of the main shaft 41 can do.

The rotation shaft 40 may be mounted between the main frame 15 and the sub frame 16 to transmit rotational force generated from the driving motor 30 to the orbiting scroll 100.

The upper portion of the rotation shaft 40 may be supported by the main frame 15 to be relatively rotatable. The main frame 15 may include a main bearing 15a that supports rotation of the rotating shaft 40.

The lower portion of the rotation shaft 40 may be supported by the sub-frame 16 so as to be relatively rotatable. The sub frame 16 may include a sub bearing 16a that supports rotation of the rotation shaft 40.

The orbiting scroll 100 may include a shaft coupling portion 130 provided so that the eccentric portion 42 is inserted. According to an embodiment of the present invention, the shaft coupling part 130 may be provided to protrude above the end plate 101 of the orbiting scroll 100. With this structure, the eccentric portion 42 may be disposed so as to protrude above the end plate 101, and the eccentric portion 42 may be disposed side by side with the orbiting wrap 102 and the fixed wrap 22. .

The orbiting scroll 100 may include a orbiting bearing 42a provided on the inner surface of the shaft coupling part 130. The slewing bearing 42a may support rotation of the eccentric portion 42.

The structure of the above-described orbiting scroll is referred to as a semi-axial through structure, and hereinafter, a semi-axial through-scroll compressor will be described as an example. However, the present invention is not limited thereto, and the present invention can be applied to a through-axis scroll compressor.

In the case of a semi-axial or through-shaft scroll compressor, the action point at which the repulsive force of the refrigerant is applied during compression and the action point at which the reaction force to offset the repulsive force is applied are applied at the same point, thus preventing the problem of increasing vibration or noise as the orbiting scroll tilts. The advantage is that you can do it. However, in the case of a semi-axial or through-shaft scroll compressor, since the rotating shaft must be inserted in the center of the slewing plate of the slewing scroll, it is not possible to form a slewing wrap over the entire area of the slewing scroll. There is a disadvantage of lowering the volume ratio. According to the idea of the present invention, there is disclosed a scroll compressor having a semi-axial or through-shaft structure, improving a wrap shape to expand a compression space, and further increase a design volume ratio.

2 is a plan view of an orbiting scroll in a scroll compressor according to an embodiment of the present invention.

Hereinafter, the orbiting wrap shape of the orbiting scroll will be described as an example. Due to the characteristics of the scroll compressor, the fixed wrap shape of the fixed scroll corresponds to the orbiting wrap shape, so the following description is applicable also to the fixed wrap of the fixed scroll.

Referring to FIG. 2, the orbiting scroll 100 according to an embodiment of the present invention may include a hard plate 101 and a orbiting wrap protruding upward from the hard plate 101.

The orbiting wrap includes a first arc portion 110 having a constant curvature, a second arc portion 120 disposed inside the first arc portion 110 and having a constant curvature, and the first arc portion 110 It may include a connection part 140 connecting the second arc part 120.

The first arc portion 110 may be provided in an arc shape having a predetermined radius. The second arc portion 120 may be provided in an arc shape, similar to the first arc portion 110, and may be formed in an arc shape whose center coincides with the first arc portion 110 and has a smaller radius. .

A shaft coupling portion 130 may be disposed inside the second arc portion 120, and an outer surface of the shaft coupling portion 130 may form a third arc portion 131. The third arc portion 131 may be provided in an arc shape having a center coincident with the first arc portion 110 and the second arc portion 120 and having a smaller radius than the second arc portion 120.

The first arc portion 110 may have a thickness t1. The second arc portion 120 may have a thickness t2.

According to the idea of the present invention, the thickness t1 of the first arc portion 110 and the thickness t2 of the second arc portion 120 may be provided equally. Therefore, t1 = t2 can be established.

In addition, the distance d1 between the first arc portion 110 and the second arc portion and the distance d2 between the second arc portion 120 and the third arc portion 131 may be provided equally. Therefore, d1 = d2 can be established.

Since the first arc portion 110 and the second arc portion 120 are provided in an arc shape that is a part of a circle having a constant radius, they may have a constant curvature.

According to the idea of the present invention, the connecting portion 140 connecting the first arc portion 110 and the second arc portion 120 has a curvature that varies from the first arc portion 110 to the second arc portion 120. I can. The curvature of the connection portion 140 may be provided to change continuously from the first arc portion 110 to the second arc portion 120. The connection part 140 may be provided to have a shape of any one of a cosine curve, a Bezier curve, a Hermite curve, or a B-spline curve. The specific shape of the connection part 140 will be described later.

According to an embodiment of the present invention, the included angle of a line segment connecting one end of the connection unit 140 and the center of the orbiting scroll 100 and a line segment connecting the other end of the connection unit 140 and the center of the orbiting scroll 100 is α may be 135°. In this case, one end of the connection part 140 may indicate a point at which the first arc part 110 and the connection part 140 are connected. The other end of the connection part 140 may indicate a point at which the second arc part 120 and the connection part 140 are connected.

3 is a diagram schematically illustrating the orbiting scroll shown in FIG. 2. 4 is a graph showing the distance from the center of the orbiting scroll to the orbiting wrap in the scroll compressor according to an embodiment of the present invention. 5 is a graph showing an enlarged portion of the graph of FIG. 4.

3 is a view showing an outer surface of a first arc portion, an outer surface of a second arc portion, and an outer surface of a third arc portion and a connection portion in the orbiting scroll shown in FIG. 2.

In Fig. 3, R₁ denotes the distance from the center of the orbiting scroll to the first arc, R₂ denotes the distance from the center of the orbiting scroll to the second arc, and R denotes the distance from the center of the orbiting scroll to the connection. Point.

In addition, θ₁ denotes an angle of one end of the connecting portion with respect to a predetermined reference line, θ₂ denotes an angle of the other end of the connecting portion with respect to the reference line, and θ denotes an angle of one point of the connecting portion with respect to the reference line. In this case, one end of the connection part may indicate a point at which the first arc part and the connection part are connected, and the other end of the connection part may indicate a point at which the second arc part and the connection part are connected.

Referring to FIG. 3, the distance from the center of the orbiting scroll to the first arc portion is constant at R₁, and the distance from the center of the orbiting scroll to the second arc portion is constant at R₂. The connecting portion connects the first arc portion and the second arc portion with a variable curvature, and the distance between each point of the connecting portion and the center of the orbiting scroll continuously changes.

4 is a graph showing the distance from the center of the orbiting scroll to the connection portion according to the change of the angle.

In FIG. 4, ε denotes a distance at which the axial center of the eccentric portion 42 is eccentric from the axial center of the main shaft 41, and t denotes the thickness of the first arc portion 110 and the second arc portion 120.

As shown in Fig. 4, the distance R from the center of the orbiting scroll to the connection portion satisfies the following equation.

When the connection part 140 connecting the first arc part 110 and the second arc part 120 is referred to as the first connection part, the second arc part 120 and the third arc part 131 are connected to each other. The distance R between the connection part (not shown) and the center of the orbiting scroll satisfies the following equation.

More specifically, referring to FIG. 5, the distance R from the center of the orbiting scroll to the other end of the connection part 140 to the other end of the connection part 140 satisfies the following equation.

Through the above equation, it can be seen that the connection portion is provided with a cosine curve. In addition, it can be seen that the connection portion is provided with a cosine curve ranging from 0° to 180° in the cosine curve, which is the same even if α changes.

Although not shown in the drawings, according to another embodiment of the present invention, the connection part 140 is a curve of any one of a Bezier curve, a Hermite curve, or a B-spline curve. Can be provided. The above-described curves have advantages in that curvature continuity is ensured, and a change in curvature of the curve is gentle and thus a degree of freedom in shape is high.

Hereinafter, various embodiments of the present invention will be described. In the following examples, descriptions of portions overlapping with the above-described embodiments will be omitted.

6 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention. As described above, the shape of the orbiting wrap of the orbiting scroll is described as an example, but it is also applicable to the fixed wrap of the fixed scroll.

Referring to FIG. 6, the orbiting scroll 200 may include a hard plate 201 and a orbiting wrap protruding upward from the hard plate 201. The orbiting wrap includes a first arc portion 210 having a constant curvature, a second arc portion 220 disposed inside the first arc portion 210 and having a constant curvature, and the first arc portion 210 It may include a connection part 240 connecting the second arc part 220. A shaft coupling portion 230 may be disposed inside the second arc portion 220, and an outer surface of the shaft coupling portion 230 may form a third arc portion 231. The second arc portion 231 may be provided in an arc shape having a center coincident with the first arc portion 210 and the second arc portion 220 and having a smaller radius than the second arc portion 220.

The first arc portion 210 may have a thickness t1. The second arc portion 220 may have a thickness t2. The thickness t1 of the first arc portion 210 and the thickness t2 of the second arc portion 220 may be the same. Therefore, t1 = t2 can be established. In addition, the distance d1 between the first arc portion 210 and the second arc portion and the distance d2 between the second arc portion 220 and the third arc portion 231 may be provided equally. Therefore, d1 = d2 can be established.

According to another embodiment of the present invention, the included angle of the line segment connecting the center of the orbiting scroll 200 with one end of the connection unit 240 and the line segment connecting the center of the orbiting scroll 200 with the other end of the connection unit 240 is α may be 100°. In FIG. 6, it is shown that α is 100°, but this is only an example. According to an embodiment of the present invention, α may be provided at 100° or more.

The connection part 240 may be provided in any one of a cosine curve, a Bezier curve, a Hermite curve, or a B-spline curve.

7 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.

Referring to FIG. 7, the first arc portion 310 and the second arc portion 320 may each include an outer surface and an inner surface. Specifically, the first arc portion 310 may include an outer surface 311 and an inner surface 312. The second arc part 320 may include an outer surface 321 and an inner surface 322.

In addition, the connecting portion is a first connecting portion 340 connecting the first arc portion 310 and the second arc portion 320, and a second connecting portion 340 connecting the second arc portion 320 and the shaft coupling portion 330 It may include a connection portion 350.

The first connector 340 may include an outer surface 341 and an inner surface 342, and the second connector 350 may include an outer surface 351 and an inner surface 352. Hereinafter, the outer surface 341 and the inner surface 342 of the first connection portion may indicate a first connection surface and a second connection surface, respectively. The outer surface 351 of the second connection part may indicate a third connection surface.

According to another embodiment of the present invention, the connection portion includes a first connection surface 341 connecting the outer surface 311 of the first arc portion and the second arc portion 321, and the inner surface 312 and the first arc portion. It may include a second connection surface 342 connecting the inner surface 322 of the second arc portion, and a third connection surface 351 connecting the outer surface 322 of the second arc portion and the third arc portion 331 .

The connection portion may be provided with any one of a cosine curve, a Bezier curve, a Hermite curve, or a B-spline curve.

Referring to FIG. 7, the angle between the line segment connecting one end of the first connecting surface 341 and the center of the orbiting scroll and the line segment connecting the other end of the first connecting surface 341 and the center of the orbiting scroll is referred to as α₁. . The included angle of a line segment connecting one end of the second connecting surface 342 and the center of the orbiting scroll and a line segment connecting the other end of the second connecting surface 342 and the center of the orbiting scroll is referred to as α₂. The included angle of the line segment connecting one end of the third connecting surface 343 and the center of the orbiting scroll and the line segment connecting the other end of the third connecting surface 343 and the center of the orbiting scroll is referred to as α₃.

According to another embodiment of the present invention, the α₁, the α₂, and the α₃ may be different from each other. In more detail, α₃ may be provided larger than α₂, and α₂ may be provided larger than α₁. For example, as shown in FIG. 7, α₁ may be 95°, α₂ may be 115°, and α₃ may be 135°.

8 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.

Referring to FIG. 8, the orbiting scroll 400 may include a hard plate 401 and a orbiting wrap protruding above the hard plate 401. The orbiting wrap includes a first arc portion 410 having a constant curvature, a second arc portion 420 disposed inside the first arc portion 410 and having a constant curvature, and a first arc portion 410 It may include a connection part 440 connecting the second arc part 420. A shaft coupling portion 430 may be disposed inside the second arc portion 420, and an outer surface of the shaft coupling portion 430 may form a third arc portion 431. The second arc portion 431 may be provided in an arc shape having a center coincident with the first arc portion 410 and the second arc portion 420 and having a smaller radius than the second arc portion 420.

The first arc portion 410 may have a thickness t1. The second arc portion 420 may have a thickness t2. The thickness t1 of the first arc portion 410 and the thickness t2 of the second arc portion 420 may be the same. Therefore, t1 = t2 can be established. In addition, the distance d1 between the first arc portion 210 and the second arc portion and the distance d2 between the second arc portion 420 and the third arc portion 431 may be provided equally. Therefore, d1 = d2 can be established.

The connection part 440 may be provided as any one of a cosine curve, a Bezier curve, a Hermite curve, or a B-spline curve.

Referring to FIG. 8, in the scroll compressor according to another embodiment of the present invention, the axial center of the eccentric part 42 may be provided to be eccentric by a predetermined distance from the center of the orbiting scroll 400. For example, the axial center of the eccentric portion 42 may be eccentric upward by the center of the orbiting scroll 400 and e. Through this structure, the scroll compressor according to another embodiment of the present invention can reduce the size of the shaft coupling portion 430. Accordingly, the compression space of the scroll compressor can be expanded, and further, the design volume ratio can be increased.

9 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.

Referring to FIG. 9, according to another embodiment of the present invention, the scroll compressor may be a general scroll compressor, not a semi-axial or through-axis scroll compressor. A general scroll compressor refers to a structure in which the eccentric portion of the rotating shaft is inserted into the boss protruding below the end plate 501 of the orbiting scroll 500, and the entire area of the upper part of the end plate 501 of the orbiting scroll 500 You can form a swivel wrap over it. Such a general scroll compressor is advantageous in terms of compression space and design volume ratio.

According to another embodiment of the present invention, while having a general scroll compressor structure, a plurality of circular arc portions 510, 520, and 530 having a constant curvature of the orbiting wrap, and the connection portions 540, 550 connecting the arc portions. 560) may be included. The arc portions 510, 520, 530 are disposed inside the first arc portion 510 and the first arc portion 510 and are provided to be spaced apart from the first arc portion 510 And, it may include a third arc portion 530 disposed inside the second arc portion 520 and provided to be spaced apart from the second arc portion 520. The connection parts 540, 550, 560 are provided with a first connection part 540 connecting one end of the first arc part 510 and one end of the second arc part 520, and the other end of the second arc part 520 A second connection part 550 connecting one end of the third arc part 530 and a third connection part 560 extending from the other end of the third arc part 530 may be included. The shape of the connection portions 540, 550, and 560 may be provided as a part of a cosine curve, and the curvature may continuously change between the arc portions 510, 520, and 530. Alternatively, the connection portions 540, 550, and 560 may be provided to have any one of a Bezier curve, a Hermite curve, or a B-spline curve. Through this structure, the compression space can be expanded and the design volume ratio can be increased compared to the wrap of the conventional involute structure.

10 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.

Referring to FIG. 10, the orbiting scroll 600 may have a semi-axial or through-axis scroll compressor structure. The orbiting scroll 600 may include a hard plate 610 and a orbiting wrap protruding from the upper part of the hard plate 601. The orbiting wrap includes an arc portion 610 having a constant curvature, a shaft coupling portion 620 disposed inside the arc portion 610 and provided to insert an eccentric portion 42 (see FIG. 1), and an arc portion ( It may include a connection part 630 connecting the 610 and the shaft coupling part 620.

The arc portion 610 may be provided in an arc shape having a predetermined radius. The shaft coupling portion 620 may be provided in an involute curve whose center is offset. In other words, the shaft coupling portion 620 may be provided as an involute curve having a center (c2) offset from the center (c1) of the hard plate 601 provided in a circular shape. An eccentric portion 42 may be inserted in the center of the shaft coupling portion 620.

The connection part 630 may be provided to connect one end of the arc part 610 and one end of the shaft coupling part 620. The connection part 630 may be provided to have any one of a cosine curve, a Bezier curve, a Hermite curve, or a B-spline curve. The above-described curves have advantages in that curvature continuity is ensured, and a change in curvature of the curve is gentle and thus a degree of freedom in shape is high.

In addition, as described above, the connection part 630 may have any one shape of a Bezier curve, a Hermite curve, or a B-spline curve. Hereinafter, a Bezier curve, a Hermite curve, or a B-spline curve is referred to as a connection curve.

According to another embodiment of the present invention, since the connection part 630 has a shape of a connection curve, the thickness t of the turning wrap can be optimized by adjusting the weight of the connection curve. In other words, in the process of optimizing the thickness (t) of the turning wrap, the thickness of the wrap can be finely adjusted by adjusting the weight of the connection curve. As described above, the curvature continuity of the connection curve is ensured, and the change in curvature of the curve is gentle and the shape freedom is high. It is easy to optimize the wrap thickness (t) by adjusting the weight using this feature of the connection curve.

11 is a plan view of an orbiting scroll in a scroll compressor according to another embodiment of the present invention.

Referring to FIG. 11, the orbiting scroll 700 may have a general scroll compressor structure. The orbiting scroll 700 may include a hard plate 701 and a orbiting wrap protruding from the upper part of the hard plate 701. The orbiting wrap includes an arc portion 710 having a certain curvature, a curved portion 720 disposed inside the arc portion 710, and a connection portion 730 connecting the arc portion 710 and the curved portion 720 It may include.

The arc portion 710 may be provided in an arc shape having a predetermined radius. The curved portion 720 may be provided as an involute curve whose center is offset. In other words, the curved portion 720 may be provided as an involute curve having a center c2 offset from the center c1 of the hard plate 701 provided in a circular shape.

The connection part 630 may be provided to connect one end of the arc part 610 and one end of the curved part 620. The connection part 630 may be provided to have any one of a cosine curve, a Bezier curve, a Hermite curve, or a B-spline curve. The above-described curves have advantages in that curvature continuity is ensured, and a change in curvature of the curve is gentle and thus a degree of freedom in shape is high.

In addition, as described above, the connection part 730 may have any one shape of a Bezier curve, a Hermite curve, or a B-spline curve. Hereinafter, a Bezier curve, a Hermite curve, or a B-spline curve is referred to as a connection curve.

According to another embodiment of the present invention, since the connection portion 730 has a shape of a connection curve, the thickness t of the turning wrap can be optimized by adjusting the weight of the connection curve. In other words, in the process of optimizing the thickness (t) of the turning wrap, the thickness of the wrap can be finely adjusted by adjusting the weight of the connection curve. As described above, the curvature continuity of the connection curve is ensured, and the change in curvature of the curve is gentle and the shape freedom is high. It is easy to optimize the wrap thickness (t) by adjusting the weight using this feature of the connection curve.

12 is a plan view of a fixed scroll corresponding to the orbiting scroll shown in FIG. 11.

Referring to FIG. 12, the fixed scroll 20a includes a disk-shaped end plate 21a and a fixed wrap extending downward from the end plate 21a and forming a compression chamber 50 (see Fig. 1) together with the orbiting wrap. 22a). 12 is a plan view showing the fixed wrap (22a) of the fixed scroll (20a) after arranging it to face upward.

According to another embodiment of the present invention, the thickness t of the fixed wrap 22a of the fixed scroll 20a satisfies the following equation.

E in the above equation indicates the eccentric distance. The eccentric distance refers to the distance between the center of the rotation shaft 40 and the center of the eccentric portion 42 shown in FIG. 1. In addition, T _min represents the minimum thickness of the fixing wrap 22a, and T _max represents the maximum thickness of the fixing wrap 22a. According to another embodiment of the present invention, the thickness (t) of the fixed wrap (22a) satisfies the above equation, thereby reducing the thrust area and thrust loss through optimization of the fixed wrap thickness (t). It can have an effect.

Meanwhile, although not shown in the drawing, the thickness of the fixed wrap of the fixed scroll corresponding to the orbiting scroll 600 shown in FIG. 10 also satisfies the following equation.

E in the above equation indicates the eccentric distance. The eccentric distance refers to the distance between the center of the rotation shaft 40 and the center of the eccentric portion 42 shown in FIG. 1. In addition, T _min represents the minimum thickness of the fixing wrap, and T _max represents the maximum thickness of the fixing wrap. According to another embodiment of the present invention, since the thickness of the fixed wrap satisfies the above equation, it is possible to have a technical effect of reducing a thrust area and reducing thrust loss through optimization of the fixed wrap thickness.

In the above, specific embodiments have been illustrated and described. However, it is not limited only to the above-described embodiments, and those of ordinary skill in the technical field to which the invention pertains will be able to perform various changes without departing from the gist of the technical idea of the invention described in the following claims. .

1: scroll compressor
20: fixed scroll
100, 200, 300, 400, 500, 600, 700: orbiting scroll
110: 1st arc part
120: 2nd arc part
130: shaft coupling portion
140: connection
30: drive motor
40: rotating shaft
50: compression chamber

Claims (22)

main body;
A fixed scroll fixed inside the main body;
An orbiting scroll provided to orbital movement with respect to the fixed scroll; And
Compression units provided on the fixed scroll and the orbiting scroll, respectively; Including,
The compression unit,
An arc part with a constant curvature,
A curved portion disposed inside the arc portion so as to be spaced apart from the arc portion by a predetermined distance; and
A connecting portion connecting the arc portion and the curved portion, the scroll compressor comprising a connecting portion having a curvature varying from the arc portion to the curved portion. The method of claim 1,
The shape of the curve formed by the connection portion is any one of a cosine curve, a Bezier curve, a Hermite curve, and a B-spline curve. The method of claim 2,
A scroll compressor having an included angle of 100° or more between a first line segment connecting one end of the connection portion and a center of the compression unit, and a second line segment connecting the other end of the connection unit and the center of the compression unit. The method of claim 1,
When the curved portion is provided in an arc shape having a constant curvature, the arc portion is referred to as a first arc portion, and the curved portion is referred to as a second arc portion. The method of claim 4,
The first arc portion and the second arc portion each have a constant thickness,
A scroll compressor in which the thickness of the first arc portion and the thickness of the second arc portion are the same. The method of claim 5,
A rotation shaft rotating about a rotation shaft, the rotation shaft including an eccentric portion eccentric from the rotation shaft, the eccentric portion disposed in parallel with the compression portion in a direction crossing the rotation shaft; Scroll compressor further comprising a. The method of claim 6,
The compression unit,
Further comprising a shaft coupling portion disposed inside the second arc portion to be spaced apart from the second arc portion a predetermined distance, the eccentric portion coupled,
The shaft coupling part,
A scroll compressor comprising a third circular arc portion forming an outer surface of the shaft coupling portion and having a constant curvature. The method of claim 7,
A scroll compressor in which a distance between the first arc portion and the second arc portion and a distance between the second arc portion and the third arc portion are the same. The method of claim 7,
The connection part,
A first connection part connecting the first arc part and the second arc part,
A scroll compressor comprising a second connecting portion connecting the second arc portion and the third arc portion and having a curvature varying from the second arc portion to the third arc portion. The method of claim 9,
The first arc portion and the second arc portion each include an outer surface and an inner surface,
The third circular arc portion scroll compressor including an outer surface. The method of claim 10,
The first connection portion includes a first connection surface connecting an outer surface of the first arc portion and an outer surface of the second arc portion, and a second connection surface connecting an inner surface of the first arc portion and an inner surface of the second arc portion and,
The second connection portion, a scroll compressor including a third connection surface connecting the outer surface of the second arc portion and the outer surface of the third arc portion. The method of claim 11,
A first angle that is an enclosed angle between a line segment connecting one end of the first connection surface and the center of the compression unit, and a line segment connecting the other end of the first connection surface and the center of the compression unit,
A second angle, which is an enclosed angle between a line segment connecting one end of the second connection surface and the center of the compression unit, and a line segment connecting the other end of the second connection surface and the center of the compression unit,
A scroll compressor in which a third angle, which is an enclosed angle between a line segment connecting one end of the third connection surface and the center of the compression unit, and a line segment connecting the other end of the third connection surface and the center of the compression unit, is different from each other. The method of claim 12,
The first angle is 95°, the second angle is 115°, and the third angle is 135°. The method of claim 7,
The distance from the center of the compression part to the connection part is R, the distance from the center of the compression part to the first arc part is R₁, the distance from the center of the compression part to the second arc part is R2, and the thickness of the circular arc part t, the distance at which the center of the eccentric part is eccentric from the center of the rotation shaft is ε, the angle of one end of the first arc with respect to a predetermined reference line is θ₁, and the angle of one end of the second arc with respect to the reference line is θ₂, when the angle to a point of the connection with respect to the reference line is θ,

The scroll compressor is established. The method of claim 7,
The center of the shaft coupling portion is a scroll compressor disposed to be offset from the center of the compression portion. The method of claim 1,
The shape of the curved portion is provided as an involute curve having a center offset from the center of the fixed scroll or the orbiting scroll. main body;
A fixed scroll fixed inside the main body;
An orbiting scroll provided to orbital movement with respect to the fixed scroll; And
Compression units provided on the fixed scroll and the orbiting scroll, respectively; Including,
The compression unit,
A first circular arc in the shape of an arc,
A second arc portion having the same center as the first arc portion and disposed inside the first arc portion, the second arc portion having the same thickness as the first arc portion;
A connecting portion connecting the first arc portion and the second arc portion, the scroll compressor including a connecting portion whose curvature continuously changes from the first arc portion to the second arc portion. The method of claim 17,
The shape of the curve formed by the connection part is a cosine curve. The method of claim 17,
A scroll compressor having an included angle of 100° or more between a first line segment connecting one end of the connection portion and a center of the compression unit, and a second line segment connecting the other end of the connection unit and the center of the compression unit. The method of claim 17,
A rotation shaft rotating about a rotation shaft, the rotation shaft including an eccentric portion eccentric from the rotation shaft, the eccentric portion disposed in parallel with the compression portion in a direction crossing the rotation shaft; Scroll compressor further comprising a. The method of claim 20,
The distance from the center of the compression part to the connection part is R, the distance from the center of the compression part to the first arc part is R₁, the distance from the center of the compression part to the second arc part is R2, and the thickness of the circular arc part t, the distance at which the center of the eccentric part is eccentric from the center of the rotation shaft is ε, the angle of one end of the first arc with respect to a predetermined reference line is θ₁, and the angle of one end of the second arc with respect to the reference line is θ₂, when the angle to a point of the connection with respect to the reference line is θ,

The scroll compressor is established. main body;
A fixed scroll fixed inside the main body and including a first plate and a fixed wrap formed on the first plate;
A orbiting scroll provided to orbit with respect to the fixed scroll and including a second diaphragm facing the first diaphragm, and a orbiting wrap and a shaft coupling portion formed on the second diaphragm; And
A rotation shaft including an eccentric portion eccentric from the rotation shaft, and coupled to the shaft coupling portion, wherein the eccentric portion is disposed to pass through the second plate; Including,
The turning wrap,
A first circular arc in the shape of an arc,
A second arc portion disposed inside the first arc portion to be spaced apart from the first arc portion;
A scroll compressor comprising a connecting portion connecting the first arc portion and the second arc portion and having a curvature varying from the first arc portion to the second arc portion.

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