BACKGROUND ART [0002] Generally, a rotary compressor (hereinafter referred to as a " compressor ") includes a cylinder, a roller provided inside the cylinder and forming a compression space together with the cylinder, And a vane that divides the refrigerant into a suction chamber and a compression chamber. The volume of the suction chamber and the compression chamber changes as the roller is moved, thereby compressing the refrigerant.
FIG. 1 is a cross-sectional view showing a compressed portion of a conventional compressor, and FIG. 2 is a cross-sectional view illustrating a portion where the vane of FIG. 1 is in contact with the roller.
1, a conventional compressor includes a cylinder 41 having a cylindrical inner space, a roller 44 rotating in the inner space of the cylinder 41, And a first vane 451 and a second vane 452 provided in the cylinder 41 so as to be movable in the radial direction of the cylinder internal space.
The roller 44 is formed in an elliptical shape such that the major axis MA1 is the same as the diameter of the inner space of the cylinder 41 and contacts the cylinder 41 at both vertexes of the major axis MA1, And is spaced apart from the cylinder 41 at a portion except for both vertex portions of the cylinder 41. [ The roller 44 thus formed is arranged such that the center of rotation of the roller 44 is concentric with the center of the inner space of the cylinder 41.
A first vane nose portion 4513 and a second vane nose portion 4513 protruded toward the roller 44 are formed at the end portion EP of the first vane 451 and the end portion EP of the second vane 452, 4523 are formed. The first vane 451 includes a first vane nose 4513 having a center of curvature CC located inside the first vane 451 and a radius of curvature Is formed to be larger than half of the thickness (t) between the opposite side portions 4511, 4519 of the vane 451. 2, the first vane nose portion 4513 thus formed is in contact with the roller 44 at the entire area (hatched portion) of the first vane nose portion 4513 thereof. Hereinafter, a portion farthest from one side of the first vane nose portion 4513 in contact with the roller 44 is referred to as a first boundary point BP1, and a portion farthest to the opposite side is referred to as a second boundary point BP2 And a portion of the first vane nose portion 4513 that meets the longitudinal center line CL of the first vane 451 is referred to as a center point CP and the first boundary point BP1 and the center of curvature CC And an angle formed by the center point CP and the center point CP is defined as a first angle 1 and a second angle 2 is defined as an angle formed by the second boundary point BP2, The first boundary point BP1 and the second boundary point BP2 are defined as the first boundary point BP1 and the second boundary point BP2 when the sum of the first angle? 1 and the second angle? 451 between the end portion EP of the first vane 451 and the opposite side portions 4511, 4519 of the first vane 451 and the first angle? 1 and the second angle? 2) are the same. The first angle [theta] 1 is approximately 27.25 [deg.] And the second angle [theta] 2 is also approximately 27.25 [deg.], Whereby the operating angle [theta] is approximately 54.5 [deg.].
Reference numerals 414a and 414b denote first and second inlets, respectively, through which the refrigerant to be compressed is sucked. Reference numerals 415a and 415b denote first discharge guide grooves and second discharge guide grooves through which compressed refrigerant is discharged, respectively.
In the conventional compressor, a space in which the first vane 451 and the second vane 452 are formed by the cylinder 41 and the roller 44 is divided into a first compression space S11 and a second compression space S11. And is divided into a compression space S12. The first compression space S11 is partitioned into a first suction chamber S111 and a first compression chamber S112 by the roller 44 and the second compression space S12 is also partitioned into the roller 44 Into a second suction chamber (S121) and a second compression chamber (S122). The first suction port 414a and the first discharge guide groove 415a are provided so as to communicate with the first compression space S11 and the second suction port 414b and the second discharge guide groove 415b And communicates with the second compression space S12.
With such a configuration, in the conventional compressor, when the power source is applied, the roller 44 is rotated concentrically in the inner space of the cylinder 41 in contact with the cylinder 41 at two portions. The first vane 451 and the second vane 452 are moved in the radial direction of the inner space of the cylinder 41 while contacting the rollers 44, respectively. Accordingly, the first suction chamber S111 is moved in the circumferential direction of the inner space of the cylinder 41, and the volume thereof is changed to become the first compression chamber S112. At the same time, the second suction chamber S121 is moved in the circumferential direction of the inner space of the cylinder 41, and the volume thereof is changed, and eventually becomes the second compression chamber S122. The refrigerant sucked into the first suction chamber S111 through the first suction port 414a is continuously compressed to a predetermined pressure in the first compression space S12 and then is discharged to the first discharge guide groove 415a, To the outside of the compression section. At the same time, the refrigerant sucked into the second suction chamber (S121) through the second suction port (414b) is continuously compressed to a predetermined pressure in the second compression space (S12), and then the second discharge guide groove (415b) To the outside of the compression section.
However, in the conventional compressor, since the roller 44 is formed in an elliptical shape and the vanes 451 and 452 are moved in the radial direction of the inner space of the cylinder 41, The magnitude of the force acting in the direction perpendicular to the direction of movement is considerably large. This increases the frictional loss between the vanes 451 and 452 and the roller 44 or between the vanes 451 and 452 and the cylinder 41.
The connection portions 4512, 4518, 4522 and 4528 between the end portion EP of the vane and the side portions 4511, 4519, 4521 and 4529 of the vane are formed to be angled, 4528, 4522, and 4528 are worn by the roller 44 because the connection portions 4512, 4518, 4522, and 4528 are included within the range of the operating angle?.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
3 is an exploded perspective view showing the compression unit of FIG. 3, FIG. 5 is a transverse sectional view of the compression unit of FIG. 3, and FIG. 6 is a cross- FIG. 7 is a cross-sectional view illustrating a portion where the vane is in contact with the roller, and FIG. 7 is a cross-sectional view showing the change of the normal direction force acting on the vane tip according to the inclined angle of the vane in FIG. This is the chart shown to illustrate.
3 to 7, a compressor according to an embodiment of the present invention includes a casing 1, a transmission portion 2 provided inside the casing 1, A rotary shaft 31 for transmitting rotational force, and a compression section 4 for compressing and discharging the refrigerant by the rotational force.
The casing 1 may include a cylindrical shell 11, an upper shell 12 covering the upper portion of the cylindrical shell 11, and a lower shell 13 covering the lower portion of the cylindrical shell 11 .
A first refrigerant suction pipe (not shown) communicating with the first compression space S11 of the compression unit 4 to be described later and a second refrigerant suction pipe And a second refrigerant suction pipe (not shown) communicating with the second refrigerant suction port S12 may be provided.
A refrigerant discharge pipe (DP) communicating with the inside of the casing (1) may be provided on the upper shell (12). The refrigerant discharge pipe DP corresponds to a passage through which the compressed refrigerant discharged from the compression unit 4 into the casing 1 is discharged to the outside of the casing 1, An oil separator (not shown) for separating the oil may be connected to the refrigerant discharge pipe DP.
A stator 21 constituting the driving unit 2 is fixed to the upper portion of the cylindrical shell 11 and the stator 21 is formed inside the stator 21 to form the driving unit 2, The rotor 22 rotating by the interaction with the stator 21 can be rotatably provided. The rotary shaft 31 may be press-fitted into the center of the rotor 22 to be engaged therewith.
An oil passage 31a for guiding the oil to the sliding portion is formed in the rotary shaft 31. The lower shell 13 is provided with an oil passage 31a on an end portion EP of the rotary shaft 31 on the lower shell 13 side. An oil feeder 32 for absorbing the oil stored in the oil feeder 32 can be coupled.
The compression section 4 may be provided on the lower side of the transmission section 2.
The compression section 4 includes a cylinder 41 having a cylindrical inner space S1 concentric with the rotary shaft 31 and a cylinder 41 enclosing both sides of the cylinder inner space S1 to form a closed space A main bearing 42 and a sub bearing 43 that support the rotation shaft 31 and a plurality of sub bearing units 43 which are concentrically coupled to the rotation shaft 31 and which are connected to the inner circumferential surface 411 of the cylinder 41 at two portions of the outer circumferential surface 443, A roller 44 which rotates and divides the cylinder internal space S1 into two spaces and a cylinder 44 which is movably provided on the cylinder 41 so as to be in contact with the roller 44, The first vane 451 and the second vane 452 partition the two spaces formed by the first vane 451 and the second vane 452 into two spaces.
The cylinder 41 includes a first vane slot VS1 into which the first vane 451 is slidably inserted, a second vane slot VS2 into which the second vane 452 is slidably inserted, A first suction port 414a for communicating the space S1 with the first refrigerant suction pipe (not shown), a second suction port 414b for communicating the cylinder internal space S1 and the second refrigerant suction pipe (not shown) A first discharge guide groove 415a for communicating the cylinder internal space S1 with a first discharge port 421a to be described later and a second discharge guide groove 415b for communicating the cylinder internal space S1 with a second discharge port 421b And a discharge guide groove 415b.
The first vane slot VS1 includes a first vane guide groove 412a opposed to both side portions 4511 and 4519 of the first vane 451 and a second vane guide groove 412b formed at a rear end of the first vane guide groove 412a And the first spring insertion groove 413a. The first vane guide groove 412a may be formed such that the first vane 451 is inclined and moved in an acute angle with respect to the radial direction of the cylinder internal space S1. That is, the first vane guide groove 412a is formed so that the first vane 451 is connected to the imaginary line connecting the center of rotation of the roller 44 and the center 412aa of the opening of the first vane guide groove 412a RTI ID = 0.0 > IL, < / RTI > At this time, the first vane guide groove 412a may be inclined in the same direction as the rotational direction of the roller 44 with respect to the imaginary line IL. The first vane guide groove 412a may be inclined with respect to the center 412aa of the opening of the first vane guide groove 412a. The center 412aa of the opening of the first vane guide groove 412a may be a point at which the center line of the longitudinal direction of the first vane guide groove 412a and the circle of the inner circumferential surface 411 of the cylinder 41 meet have. A first vane spring 47a for pressing the first vane 451 toward the roller 44 may be inserted into the first spring insertion groove 413a.
The second vane slot VS2 may be symmetrical to the first vane slot VS1 with respect to the center of rotation of the roller 44. [ That is, the second vane slot VS2 includes a second vane guide groove 412b opposed to both side portions 4521 and 4529 of the second vane 452 and a second vane guide groove 412b opposed to the opposite side portions 4521 and 4529 of the second vane guide groove 412b. And a second spring insertion groove 413b formed in the first spring insertion groove 413b. The second vane guide groove 412b may be formed such that the second vane 452 is inclined and moved in an acute angle with respect to the radial direction of the cylinder interior space S1. That is, the second vane guide groove 412b may be formed such that the second vane 452 is tilted and moved within an acute angle with respect to the imaginary line IL. At this time, the second vane guide groove 412b may be inclined in the same direction as the rotational direction of the roller 44 with respect to the imaginary line IL. The second vane guide groove 412b may be inclined with respect to the center 412ba of the opening of the second vane guide groove 412b. The center 412ba of the opening of the second vane guide groove 412b may be a point where the center line of the longitudinal direction of the second vane guide groove 412b and the circle of the inner circumferential surface 411 of the cylinder 41 meet have. A second vane spring 47b for pressing the second vane 452 toward the roller 44 may be inserted into the second spring insertion groove 413b.
The first suction port 414a may be formed on the rotating direction side of the roller 44 (the first suction chamber S111 side to be described later) with respect to the first vane guide groove 412a.
The second suction port 414b may be formed on the rotating direction side of the roller 44 (the second suction chamber S121 side to be described later) with reference to the second vane guide groove 412b.
The first discharge guide groove 415a may be formed on the side opposite to the rotation direction of the roller 44 (on the side of the first compression chamber S 112, which will be described later) with reference to the second vane guide groove 412b.
The second discharge guide groove 415b may be formed on the side opposite to the rotation direction of the roller 44 (the second compression chamber S122 side to be described later) with reference to the first vane guide groove 412a.
Herein, the cylinder 41 is formed in such a manner that the first vane guide groove 412a, the first spring insertion groove 413a, the first suction inlet 414a, and the first discharge guide groove 415a are formed in the second The center of the cylinder interior space S1 and the second spring insertion groove 413b, the second intake port 414b, and the second discharge guide groove 415b are symmetrical with respect to the center of the cylinder interior space S1 .
The main bearing 42 includes a first hard plate portion 421 formed in a substantially disc shape and covering the upper surface of the cylinder 41, a first side plate portion 421 protruding upward from the outer peripheral portion of the first hard plate portion 421, And a first bearing part 423 protruding upward from the center of the first hard plate part 421 and passing through the rotation shaft 31. [
The first hard plate 421 is provided with a first discharge port 421a through which the refrigerant compressed in the first compression space S11 is discharged and a second discharge port 421b through which the refrigerant compressed in the second compression space S12, A discharge port 421b may be formed. The first discharge port 421a may be formed at a position corresponding to the first discharge guide groove 415a and the second discharge port 421b may be formed at a position corresponding to the second discharge guide groove 415b. have. The first discharge port 421a and the second discharge port 421b may be formed at intervals of 180 degrees in the circumferential direction and may be positioned on opposite sides of the center axis of the inner space S1. The first discharge port 421a and the second discharge port 421b may be formed in the sub bearing 43, as the case may be.
A first discharge valve 461 for opening and closing the outlet of the first discharge port 421a and a second discharge valve 462 for opening and closing the outlet of the second discharge port 421b are formed on the upper surface of the first hard plate portion 421, May be provided. The first discharge valve 461 and the second discharge valve 462 are provided separately from each other, but the first discharge valve 461 and the second discharge valve 462 are integrally formed with each other, As shown in FIG.
A muffler 5 for accommodating the first discharge valve 461 and the second discharge valve 462 may be provided on the upper surface of the first hard plate portion 421. The first shaft receiving portion 423 can penetrate the center portion of the muffler 5.
The outer circumferential portion of the first side wall portion 422 may be heat shrinkable or welded to the inner circumferential surface 411 of the cylindrical shell 11.
The first shaft receiving portion 423 may be formed with a shaft receiving hole 423a through which the rotation shaft 31 is inserted and supported.
The sub bearing 43 includes a second hard plate portion 431 formed in a substantially disc shape and covering the bottom surface of the cylinder 41 and a second hard plate portion 431 protruding downward from the center of the second hard plate portion 431, And a second bearing part 433 through which the first bearing part 31 passes. The second hard plate portion 431 is coupled to the cylinder 41 and the second axial bearing portion 433 is passed through the same axial line as the axial bearing hole 423a of the first axial bearing portion 423, A shaft hole 433a for supporting the lower end of the shaft 31 can be formed.
The roller 44 may be formed in an elliptical shape in which the outer peripheral surface 443 of the roller contacts the inner peripheral surface 411 of the cylinder 41 at two portions.
More specifically, the roller 44 may be formed in a three-dimensional shape in which a plane formed by an ellipse is projected in a direction perpendicular to the plane. In this case, the major axis MA1 of the ellipse is formed to have the same length as the diameter of the cylinder internal space S1, and the minor axis MA2 of the ellipse may be formed to be shorter than the major axis MA1 of the ellipse. One plane of the stereogram (upper surface of the stereogram) becomes the upper surface 441 of the roller in contact with the first hard plate portion 421, and the other plane (bottom surface of the stereogram) A curved surface (side surface of a three-dimensional figure) which is orthogonal to both the top and bottom surfaces of the three-dimensional graphic form and curved along the ellipse is formed on the inner peripheral surface 411 of the cylinder 41 The outer circumferential surface 443 of the roller opposed to the outer circumferential surface 443 of the roller.
The roller 44 formed in this manner is in contact with the upper surface 441 of the roller in contact with the main bearing 42 and the bottom surface 442 of the roller in contact with the sub bearing 43 and the outer peripheral surface 443 of the roller, The inner circumferential surface 411 of the cylinder 41 is concentric with the inner cylinder space S1 and the rotational axis 31 while the vertexes V1 and V2 of the ellipse in the major axis MA1 are in contact with the inner circumferential surface 411 of the cylinder 41, As shown in FIG. At this time, a portion of the outer circumferential surface 443 of the roller other than the vertex portions V1 and V2 of the ellipse in the major axis MA1 may be spaced apart from the inner circumferential surface 411 of the cylinder 41. [
The first vane 451 may have a substantially rectangular shape having a predetermined length, width, and height. Here, the length of the vane is a distance extending in the moving direction of the vane, the width of the vane is a distance in a direction perpendicular to the longitudinal direction of the vane on a plane perpendicular to the rotation axis 31, And a distance in a direction perpendicular to both the direction and the width direction. The length of the first vane 451 may be such that the first vane 451 does not separate from the first vane guide groove 412a when the first vane 451 is moved in contact with the roller 44. The width of the first vane 451 can be appropriately adjusted in consideration of the strength of the vane, the volume of the compression space, and the like. The height of the first vane 451 may be such that the two spaces defined by the first vane 451 do not communicate with each other. That is, the height of the first vane 451 may be set to a height at which the first vane 451 can contact the first and second long plate portions 421 and 431.
The first vane 451 is provided with a first vane 451 protruding from the end portion EP toward the roller 44 in a longitudinal direction EP of the first vane 451 opposed to the roller 44, 1 vane nose portion 4513 may be formed. The radius of curvature R of the first vane nose portion 4513 may be equal to half the thickness t between the opposite side portions 4511 and 4519 of the first vane 451. The first vane nose portion 4513 may have a semi-circular shape in cross section perpendicular to the rotation axis 31. Accordingly, the first vane nose portion 4513 may be connected to both side portions 4511 and 4519 of the first vane 451 without being tilted. That is, the first vane nose portion 4513 can meet with both sides 4511 and 4519 of the first vane 451, respectively.
The second vane 452 may be formed in the same manner as the first vane 451. That is, the second vane 452 may have a substantially rectangular shape having a predetermined length, width, and height. The second vane 452 has a longitudinally extending end EP of the second vane 452 opposed to the roller 44. The second vane 452 protrudes from the end portion EP toward the roller 44 in a convex manner. 2 vane nose portion 4523 can be formed. The second vane nose portion 4523 may have a curvature radius R equal to half the thickness t between the opposite side portions 4521 and 4529 of the second vane 452. The second vane nose portion 4523 may have a semicircular shape in cross section perpendicular to the rotation axis 31. Accordingly, the second vane nose portion 4523 may be connected to both side portions 4521 and 4529 of the second vane 452 without being tilted. That is, the second vane nose portion 4523 can meet with both sides 4521 and 4529 of the second vane 452, each having a common tangent line.
The first vane 451 and the second vane 452 formed as described above are inserted into the first vane guide groove 412a and the second vane guide groove 412b to rotate the rotation center And may be inclined in the same direction as the rotational direction of the roller 44 within an acute angle with respect to the imaginary line IL. Accordingly, the first vane 451 is inclined more than the conventional case (when the vane is moved in the radial direction of the cylinder inner space), and the first vane 451 is inclined with respect to the virtual line IL, (S122) side so as to be in contact with the roller (44). Also, the second vane 452 is inclined more than the conventional case (when the vane is moved in the radial direction of the cylinder inner space), and the second compression chamber S122) so as to be in contact with the roller (44).
Here, the first vane 451 and the second vane 452 are divided into a first compression space S11 and a second compression space S12 by a space defined by the cylinder 41 and the roller 44, . More specifically, the first vane 451 is in contact with one side of the roller 44 and the second vane 452 is in contact with the other side of the roller 44. The first vane 451, The first compression space S11 and the second compression space S12 may be formed on the left and right sides of the imaginary partition wall around virtual partition walls formed by the roller 44 and the second vane 452 . The first compression space S11 is partitioned into a first suction chamber S111 and a first compression chamber S112 by the roller 44 contacting the inner peripheral surface 411 of the cylinder 41, The compression space S12 may be partitioned into the second suction chamber S121 and the second compression chamber S122 by the roller 44 contacting the inner circumferential surface 411 of the cylinder 41. [
The operation and effect of the compressor according to one embodiment of the present invention are as follows.
That is, when power is applied to the electromotive unit 2 and the rotor 22 and the rotation shaft 31 are rotated, the roller 44 is rotated together with the rotation shaft 31, Two rotations can be done when rotating. More specifically, when the roller 44 is rotated from 0 DEG to 180 DEG, if the point of time when the long axis MA1 of the roller is coaxial with the imaginary line IL is 0 DEG, The refrigerant is sucked into the suction chamber S111 and the second suction chamber S121 respectively and simultaneously the refrigerant is compressed in the first compression chamber S112 and the second compression chamber S122, Can be discharged to the inner space (S2) of the muffler (5) through the discharge port (421a) and the second discharge port (421b). The refrigerant is sucked into the first suction chamber S111 and the second suction chamber S121 when the roller 44 rotates from 180 to 360 degrees and the refrigerant is sucked into the first compression chamber S112, The refrigerant is compressed in the second compression chamber S122 and then discharged to the inner space S2 of the muffler 5 through the first discharge port 421a and the second discharge port 421b . The refrigerant discharged into the internal space S2 of the muffler 5 can be discharged to the outside of the compressor through the refrigerant discharge pipe DP through the internal space S3 of the casing 1. [ The first suction chamber S111 and the second suction chamber S121 when the roller 44 is rotated from 0 DEG to 180 DEG are rotated such that the roller 44 is rotated from 180 DEG to 360 DEG The first compression chamber S112 and the second compression chamber S122 may be used. That is, the first suction chamber S111 and the second suction chamber S121 can be changed into the first compression chamber S112 and the second compression chamber S122 while the roller 44 is rotated have. The first compression chamber S112 and the second compression chamber S122 are rotated in the first suction chamber S111 and the second suction chamber S121 while the roller 44 is rotated, . The refrigerant introduced into the first compression space S11 from the first suction port 414a is discharged to the first discharge port 421a after being compressed and is discharged from the second suction port 414b through the second compression The refrigerant introduced into the space S12 is compressed and discharged to the second discharge port 421b. This process occurs twice during one rotation of the roller 44. [
In this series of processes, the roller 44 is rotated concentrically with the rotary shaft 31. As the refrigerant is simultaneously sucked and compressed in the first compression space S11 and the second compression space S12, The gas forces transmitted to the center of the rotary shaft 31 among the gas forces generated by the compression of the refrigerant are canceled each other so that the reaction force in the radial direction becomes almost zero and the vibration of the compressor can be remarkably reduced.
The first vane 451 and the second vane 452 are connected to the second compression chamber S122 and the first compression chamber S112 on the basis of the virtual line IL, 44), the compression efficiency can be improved and the friction loss can be reduced. This action and effect will be described in more detail with the first vane 451 as an example.
That is, the first vane 451 can be in contact with the roller 44 on the side opposite to the rotation direction of the roller 44 (on the side of the second compression chamber S122) with respect to the imaginary line IL . The first vane 451 is in contact with the roller 44 within a predetermined range of the working angle θ so that the working angle θ is the centerline CL of the first vane 451 And may be biased toward the rotating direction of the roller 44 as a reference. That is, a portion farthest from the first vane nose portion 4513 toward the first compression space S11 is referred to as a first boundary point BP1, and the first vane nose portion 4513, A portion farthest to the second compression space S12 side among the portions of the first vane nose portion 4513 contacting the roller 44 is referred to as a second boundary BP2, The center of gravity CC of the first vane nose portion 4513 and the center point CP of the first vane nose portion 4513 are referred to as a center point CP, And the angle formed by the second boundary point BP2, the center of curvature CC of the first vane nose portion 4513 and the center point CP is defined as a first angle? 2), the operating angle (?) is a sum of the first angle (? 1) and the second angle (? 2), and the first angle? 1 is larger than the second angle Can be . In the case of this embodiment, the first angle? 1 may be about 53.5 °, and the second angle? 2 may be about 20.9 °.
The first vane 451 is moved in the direction of the imaginary line IL to contact the roller 44 (hereinafter, referred to as 'conventional'), The volume of the first compression chamber S122 may be increased to increase the amount of refrigerant suction in the first suction chamber S111 and the volume of the second compression chamber S122 may be decreased to increase the refrigerant compression amount in the second compression chamber S122. The reference point at which the first vane 451 is tilted is located on the imaginary line IL at a position closer to the center of rotation of the roller 44 than the center 412aa of the opening of the first vane guide groove 412a , The volume increase amount of the first suction chamber (S111) and the volume decrease amount of the second compression chamber (S122) can be reduced. Therefore, the reference point at which the first vane 451 is tilted is located at the center 412aa of the opening of the first vane guide groove 412a on the imaginary line IL or at a position distant from the center of rotation of the roller 44 It may be desirable to be positioned. On the other hand, with the same principle, the volume of the second suction chamber S121 is increased by the second vane 452 to increase the refrigerant suction amount of the second suction chamber S121, S112) may be reduced to increase the refrigerant compression amount in the first compression chamber (S112). As the refrigerant suction amount of the first suction chamber S111 and the refrigerant compression amount of the first compression chamber S112 are increased, the compression efficiency of the first compression space S11 is improved, The compression efficiency of the second compression space S12 can be improved as the refrigerant suction amount of the second compression chamber S121 and the refrigerant compression amount of the second compression chamber S122 are increased.
In addition, the first vane 451 may have a reduced force acting on the first vane 451. The action force acting on the first vane 451 includes a force Fn applied to the first vane 451 by the roller 44 (hereinafter referred to as a vane normal force) There may be a gas pressure generated by the refrigerant compressed in the second compression chamber S122. The force V applied to the roller 44 by the torque of the roller 44 is applied to the roller 44 and the first vane 451, Is a normal direction component perpendicular to the common tangent line of the portion where the first vane 451 contacts. At this time, the distance from the rotation center of the roller 44 to the portion where the roller 44 and the first vane 451 are in contact with each other (hereinafter referred to as a "contact portion") may be longer than in the prior art. Thus, the force and the distance at the same torque are inversely proportional to each other, so that the magnitude of the force F on the contact portion can be reduced, and the vane normal force Fn can be reduced. In addition, the angle? Between the line of action of the force F above the contact portion and the line of action of the vane normal force Fn may be larger than in the prior art. Accordingly, the vane normal force Fn can be further reduced. Accordingly, abrasion and friction loss between the first vane 451 and the roller 44 can be reduced. The friction loss between the first vane 451 and the first vane guide groove 412a generated by the reaction force of the vane normal force Fn may be reduced. Next, the gas force may be applied in a direction perpendicular to the surface of the first vane 451. At this time, as the first vane 451 is inclined with respect to the imaginary line IL, the force acting on the moving direction side of the first vane 451 out of the gas force becomes larger than the conventional one, The force acting in the direction perpendicular to the moving direction of the first vane 451 can be made smaller than the conventional one. Accordingly, the friction loss between the first vane 451 and the first vane guide groove 412a generated by the reaction force of the gas force is reduced, and the movement of the first vane 451 can be more smoothly performed .
The first vane nose portion 4513 and the second vane 452 nose portion 4523 are formed on the side portions 4511 and 4519 of the first vane 451 and the side portions 4511 and 4519 of the second vane 452, The rollers 44 can be prevented from being abraded by being formed not to engage with the rollers 4521 and 4529. This function and effect will be described in more detail with the first vane nose portion 4513 as an example.
That is, the first vane nose portion 4513 is formed so that the radius of curvature R is equal to half of the thickness t between the side portions 4511 and 4519 of the first vane 451, 451, 451, 451, respectively. Accordingly, the first vane nose portion 4513 may be formed not to be angled with both side portions 4511 and 4519 of the first vane 451. Accordingly, even if the first vane 451 is inclined with respect to the imaginary line IL, the first vane nose portion 4513 (more precisely, the end of the first vane) and the first vane 451 The problem that the connecting portions 4512 and 4518 between the side portions 4511 and 4519 of the roller 44 is worn by the roller 44 can be suppressed.
7, the first vane 451 may be inclined with respect to the imaginary line IL by 10 to 20 degrees with respect to the vane normal force Fn and the working angle? In the range of about < / RTI > When the vane normal force Fn is reduced, wear and frictional loss between the first vane 451 and the roller 44 can be reduced as described above. The connecting portions 4512 and 4518 between the first vane nose portion 4513 and the side portions 4511 and 4519 of the first vane 451 are in the range of the operating angle? So that the problem of the connection portions 4512 and 4518 abrading the roller 44 can be prevented in advance. 7,? Is an angle at which the first vane 451 is tilted with respect to the imaginary line IL, and an angle tilted in the rotational direction of the roller 44 with respect to the imaginary line IL And the angle of inclination of the roller 44 in the direction opposite to the rotation is expressed as a negative value.
In this embodiment, the connection portions 4512 and 4518 between the first vane nose portion 4513 and the opposite side portions 4511 and 4519 of the first vane 451 do not abrade the roller 44, The radius of curvature R of the first vane nose portion 4513 is formed in a semicircular shape having the same half of the thickness t between the opposite side portions 4511 and 4519 of the vane. However, as shown in Fig. 8, The radius of curvature R of the vane nose portion 4513 may be formed to be smaller than half the thickness t between the opposite side portions 4511 and 4519 of the vane. In this case, the connecting portions 4512 and 4518 are formed to be stepped and angled, but they are not located within the range of the operating angle?, So that the roller 44 may not be worn. Therefore, in this case, the abrasion of the roller 44 by the connecting portions 4512 and 4518 is suppressed, and it is not necessary to process the connecting portions 4512 and 4518 so that the tolerance management is facilitated The manufacturing cost can be reduced. Further, as shown in FIG. 9, the first vane nose portion may be formed to have a plurality of curvature radii R1 and R2. That is, the first vane nose portion 4513 has a first curved portion 4513a extending from the side portions 4511 and 4519 of the first vane and a second curved portion 4513c extending from the first curved portion 4513a Wherein the first curved portion 4513a is formed such that the radius of curvature R1 is smaller than half the thickness t between the opposite side portions 4511 and 4519 of the first vane 451 and the second curved portion 4513c May be formed such that the radius of curvature R2 is larger than half the thickness t between the opposite side portions 4511 and 4519 of the first vane 451. [ At this time, the first curved portion 4513a may be formed so as to have a common tangent to the side portions 4511 and 4519 and the second curved portion 4513c of the first vane 451, respectively. Accordingly, since the side portions 4511 and 4519, the first curved portion 4513a, and the second curved portion 4513c of the vane are gently connected without being bent, wear of the roller 44 is suppressed, Since the contact portion (hatched portion) of the first vane 451 is dispersed, wear of the first vane 451 can be suppressed. In this case, the first angle? 1 is approximately 27.2 °, the second angle? 2 is approximately 20.5 °, and the operating angle may be approximately 47.7 °. Of course, the second vane 452 may also have the same effect.
The end portion EP of the first vane 451 is formed to be symmetrical with respect to the longitudinal center line CL of the first vane 451, The end portion EP of the first vane 451 is formed in the longitudinal direction of the first vane 451 as shown in FIG. Only a part of the end portion EP of the first vane 451 may be formed as the first vane nose portion 4513. [ That is, the first vane nose portion 4513 may be formed only in the range of the operating angle? Of the end portion EP of the first vane 451. In this case, the first vane nose portion 4513 is disposed on the rotation direction side of the roller 44 (on the side of the first suction chamber S111 side The portion other than the first vane nose portion 4513 may not be processed separately from the end portion EP of the first vane 451. Accordingly, The corner portion 4516 located on the opposite side of the first vane nose portion 4513 with respect to the longitudinal center line CL of the first vane 451 The volume of the second compression chamber S122 can be reduced and the compression efficiency can be further increased since the second vane 452 is further protruded to the outside of the first vane 451 than the above embodiment. The same action and effect can be obtained.
