KR20220125564A - Air Conditioner - Google Patents

Abstract

The present invention relates to an air conditioner in which the vane can be stably moved. According to the present invention, the air conditioner comprises: a housing having an outlet formed on one side thereof; a suction cover disposed on one side of the housing and having the housing and a discharge flow passage; a blower fan rotatably disposed inside the housing and allowing air to flow to the outlet; a vane movably disposed in the housing in a direction where the suction cover is disposed and controlling a wind direction of the air flowing the discharge flow passage; a first roller rotatably disposed in the housing and coming in contact with the vane; and a second roller rotatably disposed in the vane and coming in contact with the housing.

Description

Air Conditioner {Air Conditioner}

The present invention relates to an air conditioner, and more particularly, to an indoor unit of a ceiling type air conditioner.

In the case of a ceiling-type air conditioner, it is a device that is installed on the ceiling and supplies heat-exchanged air to the room.

In the ceiling type air conditioner, a plurality of outlets for discharging air into a plurality of spaces may be formed. In addition, a vane for adjusting a wind direction of the discharged air may be disposed at each of the plurality of discharge ports. The vanes may be rotatably disposed at the outlet, or may move linearly and reciprocate in the direction of the outlet, and may be disposed movably.

Patent Registration No. 10-1833413 discloses a structure in which the vane linearly reciprocates in the direction of the outlet. However, in the case of such a vane, the arrangement of the vanes may be changed by vibration of a blowing fan or flow of air, which may cause a scratch between the vane and the housing or a malfunction of the vane.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner in which vanes can stably move. That is, to provide an air conditioner that prevents the vane from coming into contact with the housing when the vane moves in the vertical direction.

Another object of the present invention is to provide an air conditioner capable of stably moving even in vibration in a direction perpendicular to the direction in which the vane moves. An object of the present invention is to provide an air conditioner that prevents both ends of a vane from coming into contact with a housing.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an air conditioner according to an embodiment of the present invention includes a housing having a discharge port on one side, a suction cover disposed on one side of the housing and forming a discharge passage with the housing, and an inner side of the housing A blower fan which is rotatably disposed on the air outlet and flows air to the outlet, and a vane which is movably disposed in a direction in which the suction cover is disposed in the housing and adjusts a wind direction of the air flowing through the outlet channel; The vane may be stably moved by including a first roller rotatably disposed on the housing and in contact with the vane, and a second roller rotatably disposed on the vane and contacting the housing.

In the housing, a vane space in which the vane is accommodated, and a vane hole formed at one side of the vane space so that the vane protrudes out of the housing are formed, and the first roller is a housing forming the vane hole. It is disposed on one side, and can move without contacting the housing of the vane.

A plurality of protrusions protruding from one side of the vane and extending in a direction in which the vane moves are formed in the vane, and the first roller includes at least one of the plurality of protrusions to prevent the vane from moving in the longitudinal direction. It is arranged to be in contact, and it is possible to prevent the vane from moving in the longitudinal direction when the vane moves in the vertical direction.

It is spaced apart in the longitudinal direction of the vane, it is possible to secure the rigidity of the vane.

The vane includes a first surface guiding a wind direction of the air flowing through the discharge passage and a second surface formed in a direction opposite to the first surface, and the first roller is in contact with the first surface. The first inner roller and the first outer roller in contact with the second surface may be in contact with the first surface and the second surface of the vane to maintain a gap between the vane and the housing.

A plurality of protrusions protruding radially outward from the second surface and extending in a vertical direction are formed on the second surface, and a plurality of grooves forming a groove extending in the vertical direction between the plurality of protrusions.

On the first surface, a protrusion that protrudes in the direction of the first inner roller and extends in the vertical direction is formed at a portion in contact with the first inner roller, so that the first inner roller may be in contact with the protrusion.

A roller groove recessed inward to insert the protrusion or the protrusion may be formed on each of the circumferential surfaces of the first inner roller and the first outer roller, thereby preventing the vane from moving in the longitudinal direction.

The vane includes a guide panel for changing a wind direction of the air flowing along the discharge passage, and a connector disposed on one side of the guide panel to move the guide panel, and the first roller is the guide panel. is disposed so as to be in contact with, and the second roller is rotatably disposed on the connector, and can be stably moved by the first roller and the second roller in the upper and lower portions of the vane.

The guide panel includes a first surface for guiding a wind direction of the air flowing through the discharge passage and a second surface formed in a direction opposite to the first surface, and the connector includes a surface parallel to the guide panel. an inner wall forming an inner wall, an outer wall spaced apart from the inner wall in a radial direction, and a connecting wall connecting the ends of the inner wall and the outer wall, wherein the first roller is in contact with the first surface a first inner roller and a first outer roller in contact with the second surface, wherein the second roller includes a second inner roller rotatably disposed on the inner wall and a second inner roller rotatably disposed on the outer wall Stable vertical movement is possible through the first roller and the second roller disposed on both sides in each of the upper and lower portions of the vane, including the two outer rollers.

In the housing, a vane space in which the vane is accommodated, and a vane hole formed at one side of the vane space so that the vane protrudes out of the housing are formed, and the housing forms one side of the vane space, A peripheral wall formed parallel to the side wall, an end wall bent at the upper end of the peripheral wall and contacting the upper end of the connector to limit movement of the vane in one direction, and disposed in the vane space, the other side of the vane a supporter extending downwardly from the end wall to be disposed parallel to, wherein the second inner roller is in contact with the peripheral wall, and the second outer roller is disposed to contact the supporter, a second inner roller and the second outer roller may guide the movement of the vane.

The first inner roller is disposed below the second outer roller, and the first outer roller is disposed below the second inner roller, so that the vane can move stably.

The vane forms a curved surface convex outwardly, and the first inner roller and the second outer roller are disposed at the center of the vane in the longitudinal direction.

The first outer roller is provided with a pair of spaced apart from the first inner roller in the longitudinal direction of the vane in the left and right directions, and the second inner roller is spaced apart from the second outer roller in the longitudinal direction of the vane in the left and right directions. A pair is provided, so that the vanes formed long in the longitudinal direction of the vanes can be moved stably.

The details of other embodiments are included in the detailed description and drawings.

According to the air conditioner of the present invention, there are one or more of the following effects.

First, it is possible to prevent the vane from coming into contact with the vane hole formed in the housing, so there is an advantage in that it is possible to prevent malfunction or friction of the vane.

Second, since the first roller contacts the protrusion or protrusion formed on the vane to limit the longitudinal movement of the vane, there is also an advantage that the vane can stably move even in the vibration of the air conditioner.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of an air conditioner according to an embodiment of the present invention.
2 is a bottom view of an air conditioner according to an embodiment of the present invention.
3A is a cross-sectional view of the air conditioner in a state in which vanes are disposed in a vane space according to an embodiment of the present invention.
3B is a cross-sectional view of the air conditioner in a state in which a vane protrudes on a discharge passage according to an embodiment of the present invention.
4 is an exploded perspective view of a vane, a roller, and a vane motor for moving the vane according to an embodiment of the present invention.
5 is a side view of a state in which a vane, a roller, and a vane motor are coupled according to an embodiment of the present invention.
Figure 6a is a cross-sectional view for explaining the arrangement of the vane and the second roller according to an embodiment of the present invention.
Figure 6b is a cross-sectional view for explaining the arrangement of the vane and the first roller according to an embodiment of the present invention.
7 is a cross-sectional view for explaining the arrangement of a vane, a first outer roller, and a second inner roller according to an embodiment of the present invention.
8 is a cross-sectional view for explaining the arrangement of a vane, a first inner roller, and a second outer roller according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

The upward (U) and downward (D) directions indicated in the drawings will be described based on the bars indicated in the drawings. The inner direction of the air conditioner used in the following description may refer to the central direction of the rotation shaft of the blower fan. The outward direction of the air conditioner may mean a radially outward direction from the rotation shaft of the blower fan. In addition, based on the space described below, the direction in which the space is formed may be described as the inside and the outside as the outside.

Hereinafter, the present invention will be described with reference to the drawings for explaining the air conditioner according to the embodiments of the present invention.

<Entire configuration>

Hereinafter, an air conditioner according to the present embodiment will be described with reference to FIG. 1 .

The air conditioner may be a ceiling type air conditioner installed on a ceiling surface of an indoor space. The air conditioner may be disposed on the upper side of the indoor space and discharge the heat-exchanged air in the lower direction.

In the air conditioner, the upper surface is installed on the ceiling surface of the indoor space, the housing 10 forming the discharge port 40 in the downward direction, the suction cover 30 forming the housing 10 and the discharge passage 42, the suction It is disposed on the upper side of the cover 30, a blower fan 44 for flowing air to the outlet 40, a heat exchanger 48 that heats the air flowing to the outlet 40 by the blower fan 44 with a refrigerant. , and a vane 60 that is movably disposed in the housing 10 in the vertical direction and controls the wind direction of the air flowing through the discharge passage 42 , and is rotatably mounted on the housing 10 and the vane 60 It includes a first roller 90 in contact with, and a second roller 94 rotatably disposed on the vane 60 and in contact with the housing 10 .

The air conditioner 1 is disposed on the upper side of the suction cover 30 and operates an orifice 50 for guiding the air flowing through the suction port 38 to the blowing fan 44 and the blowing fan 44 . It further includes a blower motor (46).

The housing 10 forms a space in which the blowing fan 44 and the heat exchanger 48 are disposed. The housing 10 has an open lower portion. The housing 10 has a hollow inside and may have a bowl shape that is opened in a downward direction.

The housing 10 forms a space in which the blowing fan 44 is disposed, and is opened so that the suction cover 30 is disposed below the space in which the blowing fan 44 is disposed.

The housing 10 includes an outer cover 12 forming an outer shape exposed to the outside, and a first guider 14 for guiding the air discharged to the discharge port 40 through the heat exchanger 48 . The housing 10 is disposed on the upper side of the outer cover 12, the top cover 16 disposed to face the ceiling, the first guider 14 above, and a heat exchanger 48 and a blower fan ( and an inner cover 18 forming a space in which 44) is disposed.

The inner cover 18 extends in the vertical direction and may be disposed to face the heat exchanger 48 . The first guider 14 extends from the lower end of the inner cover 18 . The first guider 14 forms a curved surface extending radially outward from the upper side to the lower side. The first guider 14 has a vane hole 22 formed so that the vane 60 passes therethrough.

Referring to FIGS. 3A to 3B , in the housing 10 , the vane space 20 in which the vane 60 is accommodated and the vane 60 formed below the vane space 20 and moving downward pass through it. A hole 22 is formed. The vane space 20 is disposed above the first guider 14 . The vane hole 22 is formed on one side of the first guider 14 .

Referring to FIG. 6B , a width 22D at which the vane hole 22 is formed in the radial direction of the air conditioner is greater than a width 60L of the vane 60 . However, the width length 22D of the vane hole 22 is formed to be less than three times the width length 60L of the vane 60 . When the width 22D of the vane hole 22 is unlimitedly increased, the air flowing along the first guider 14 may flow to the vane hole 22 to prevent the flow of the discharged air.

Referring to FIGS. 3A to 3B , the housing 10 forms one side of the vane space 20 , and a circumferential wall 24 formed parallel to one side of the vane 60 , and the circumferential wall 24 . and an end wall 26 bent at the upper end of the vane 60 and in contact with the upper end of the vane 60 to limit upward movement of the vane 60 . The housing 10 includes a supporter 28 disposed in the vane space 20 and extending downwardly from the end wall 26 so as to be disposed parallel to the other side surface of the vane 60 .

Referring to FIG. 2 , the suction cover 30 is disposed above the suction panel 32 and the suction panel 32 forming the suction port 38 , and forms a discharge passage 42 with one side of the housing 10 . The second guider 36 and the drain pan 34 disposed below the heat exchanger 48 to temporarily store or discharge condensed water generated in the heat exchanger 48 may be included.

The suction panel 32 has a disk shape, and a plurality of suction ports 38 opened in the vertical direction may be formed.

The second guider 36 may form a discharge passage 42 for sending the air heat-exchanged with the first guider 14 to the discharge port 40 . The discharge flow path 42 may form a flow path inclined in the downward direction and radially outward. The discharge flow path 42 may form a curved flow path for guiding the air moving downward through the heat exchanger 48 radially outward.

The air flowing through the discharge passage 42 may flow along the surfaces formed by the first guider 14 and the second guider 36 and may flow outward in the radial direction.

The vane 60 may adjust the wind direction of the air flowing to the outlet 40 . The vane 60 may protrude downward from the housing 10 or may be inserted and disposed inside the housing 10 . Referring to FIG. 4 , the vane 60 may be formed in an arc shape convex outwardly of the air conditioner. A plurality of vanes 60 may be disposed in the housing 10 . Referring to FIG. 2 , four vanes 60a , 60b , 60c , and 60d may be disposed in the housing 10 .

The vane 60 may change the wind direction of the air flowing along the discharge passage 42 . When the vane 60 is disposed in the vane space 20, the air flowing through the discharge passage 42 will flow outward in the radial direction along the surfaces formed by the first guider 14 and the second guider 36. can Referring to FIG. 3A , when the vane 60 is disposed in the vane space 20 , the lower end surface of the vane 60 may be formed in parallel with the surface formed by the first guider 14 . Accordingly, the air flowing along the first guider 14 may flow in a direction parallel to the ceiling surface along the angle of the surface formed by the downstream end of the first guider 14 .

The vane 60 includes a guide panel 62 for changing the wind direction of the air flowing along the discharge passage 42 , and a connector 74 disposed on one side of the guide panel 62 and moving the guide panel 62 . ) is included.

The guide panel 62 has an arc shape convex outwardly of the air conditioner. A connector 74 is disposed above the guide panel 62 . The guide panel 62 includes a first surface 64 disposed to face the peripheral wall 24 .

The guide panel 62 includes a first surface 64 disposed to face the air flowing along the discharge passage 42 and a second surface 68 opposite to the first surface 64 .

Referring to FIG. 4 , a plurality of grooves 72 extending in the vertical direction are formed on the second surface 68 . Between each of the plurality of grooves 72 , a protrusion 70 protruding radially outward from the second surface 68 is formed.

The first roller 90 to be described below may be disposed in contact with one of the plurality of protrusions 70 .

The first surface 64 may be smoothly formed as a surface for guiding the flow of air. However, referring to FIG. 5 , a protrusion 66 may be formed on the first surface 64 at a portion in contact with the first roller 90 .

The connector 74 may be connected to a vane gear to be described below. The connector is disposed above the guide panel 62 . The connector 74 includes an inner wall 76 forming a plane parallel to the guide panel 62 , an outer wall 78 spaced apart from the inner wall 76 in a radial direction, and an inner wall 76 and an outer wall. and a connecting wall 80 connecting the ends of 78 .

The inner wall 76 is disposed to face the peripheral wall 24 forming the vane space 20 of the housing 10 , and the outer wall 78 faces the supporter 28 disposed in the vane space 20 . is laid out

The vane 60 has a second roller 94 disposed on the inner wall 76 facing the peripheral wall 24 or the outer wall 78 facing the supporter 28 .

Referring to FIG. 3B , when the vane 60 moves downward, the guide panel 62 is disposed to protrude downward from the surface formed by the first guider 14 . When the vane 60 protrudes downward of the first guider 14 , the air flowing through the discharge passage 42 may flow downward along the first surface 64 of the guide panel 62 . When the vane 60 protrudes downward of the first guider 14 , the air flowing along the discharge passage 42 may flow downward along the first surface 64 of the guide panel 62 . .

The first roller 90 is disposed on the housing 10 so as to contact the guide panel 62 . The second roller 94 is disposed on the connector 74 of the vane 60 to contact the peripheral wall 24 or the supporter 28 .

Referring to FIG. 6B , the housing 10 includes an inner end 22a disposed inside the vane hole 22 and an outer end 22b disposed outside the vane hole 22 . A first roller 90 is disposed at each of the inner end 22a and the outer end 22b.

The first roller 90 includes a first inner roller 90a rotatably disposed on the inner end 22a and a first outer roller 90b rotatably disposed on the outer end 22b.

Referring to FIG. 6B , on the circumferential surface of the first roller 90 , a roller groove 92 having an inwardly recessed shape is formed. The protrusion 66 formed on the first surface 64 of the guide panel 62 or the protrusion 70 formed on the second surface 68 of the guide panel 62 may be disposed in the roller groove 92 . That is, the protrusion 66 or the protrusion 70 is disposed in the roller groove 92 formed in the first roller 90 , so that the movement in the centrifugal direction of the vane 60 can be prevented.

The first inner roller 90a is rotatably disposed on the inner end 22a and is disposed in contact with the first surface 64 of the guide panel 62 . The first outer roller 90b is rotatably disposed on the outer end 22b and is disposed in contact with the second surface 68 of the guide panel 62 .

The first inner roller 90a and the first outer roller 90b prevent contact between the vane 60 and the housing 10 when the vane 60 moves.

Referring to FIG. 6B , the first inner roller 90a is disposed at the center of the vane hole 22 in the longitudinal direction. A pair of the first outer roller 90b may be provided to be spaced apart from the first inner roller 90a in both longitudinal directions of the vane. Here, the longitudinal direction of the vane hole 22 may mean a direction in which the vane hole 22 extends while forming a curved surface. The first inner roller 90a is disposed between a pair of first outer rollers 90b spaced apart from each other.

Referring to FIG. 6A , the second roller 94 is rotatably disposed on the vane 60 and rotatably disposed on the vane 60 with the second inner roller 94a contacting the peripheral wall 24 . and a second outer roller 94b in contact with the supporter 28 .

The second inner roller 94a is rotatably disposed on the inner wall 76 of the connector 74 , and the second outer roller 94b is rotatably disposed on the outer wall 78 of the connector 74 .

The second inner roller 94a is rotatably disposed on the inner wall 76 of the connector 74 and is disposed in contact with the peripheral wall 24 . The second outer roller 94b is rotatably disposed on the outer wall 78 of the connector 74 and is disposed in contact with the supporter 28 .

The second inner roller 94a and the second outer roller 94b may stably guide the vertical movement of the vane 60 .

Referring to FIG. 6A , the second outer roller 94b is disposed at the center of the vane 60 in the longitudinal direction. A pair of the second inner roller 94a may be provided to be spaced apart from the second outer roller 94b on both sides of the vane in the longitudinal direction. Here, the longitudinal direction of the vane 60 may mean a direction in which the vane 60 extends while forming a curved surface. The second outer roller 94b is disposed between a pair of second inner rollers 94a spaced apart from each other.

Referring to FIG. 7 , the pair of second inner rollers 94a may be disposed above each of the pair of first outer rollers 90b. A pair of second inner rollers 94a maintain a gap between the vane 60 and the peripheral wall 24 , and a pair of first outer rollers 90b is disposed between the housing 10 and the vane 60 . spacing can be maintained.

Referring to FIG. 8 , the second outer roller 94b may be disposed above the first inner roller 90a. The second outer roller 94b may maintain a gap between the supporter 28 and the vane 60, and the first inner roller 90a may maintain a gap between the first housing 10 and the vane 60. have.

Referring to FIG. 4 , the air conditioner 1 includes a vane motor 100 for moving a vane 60 in the vertical direction, a first vane gear 104 connected to the vane motor 100 and rotating, from one side. It includes a second vane gear 106 connected to the vane 60 and meshing with the first vane gear 104 from the other side, and a motor cover 108 for fixing the vane motor 100 to the housing 10 .

The first vane gear 104 may be a spur gear connected to the vane motor 100 and rotating. The second vane gear 106 may be a rack gear that meshes with the first vane gear 104 and moves in the vertical direction according to the rotation of the first vane gear 104 . The second vane gear 106 may have a lower end connected to the connector 74 . By the movement of the second vane gear 106 , the vane 60 may move downward through the vane hole 22 .

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

10: housing 14: first guider
20: vane space 22: vane hole
24: peripheral wall 26: end wall
28: supporter 30: suction cover
32: suction panel 36: second guider
38: intake port 40: discharge port
42: discharge flow path 44: blowing fan
48: heat exchanger 60: vane
62: guide panel 64: first side
66: protrusion 68: second surface
70: protrusion 72: groove
74: connector 76: inner wall
78: outer wall 80: connection wall
90: first roller 92: roller groove
90a: first inner roller 90b: first outer roller
94: second roller 94a: second inner roller
94b: second outer roller 100: vane motor
104: first vane gear 106: second vane gear

Claims (14)

a housing forming a discharge port on one side;
a suction cover disposed on one side of the housing and forming a discharge passage with the housing;
a blowing fan rotatably disposed inside the housing and flowing air to the outlet;
a vane movably disposed in the housing in a direction in which the suction cover is disposed and for controlling a wind direction of the air flowing through the discharge passage;
a first roller rotatably disposed on the housing and in contact with the vane; and
and a second roller rotatably disposed on the vane and contacting the housing. The method of claim 1,
In the housing, a vane space in which the vane is accommodated, and a vane hole formed at one side of the vane space so that the vane protrudes out of the housing are formed,
The first roller is an air conditioner disposed on one side of the housing forming the vane hole. The method of claim 1,
A plurality of protrusions protruding from one side of the vane and extending in the direction in which the vane moves are formed in the vane,
The first roller is disposed in contact with at least one of the plurality of protrusions to prevent the vane from moving in a direction in which the rotation shaft of the first roller is formed. 4. The method of claim 3,
The plurality of protrusions are spaced apart from each other in the longitudinal direction of the vane. The method of claim 1,
The vane is
A first surface for guiding a wind direction of the air flowing through the discharge passage and a second surface formed in a direction opposite to the first surface,
The first roller may include a first inner roller in contact with the first surface and a first outer roller in contact with the second surface. 6. The method of claim 5,
The second surface has a plurality of protrusions protruding radially outward from the second surface and extending in the vertical direction, and a plurality of grooves forming grooves extending in the vertical direction between the plurality of protrusions. energy. 7. The method of claim 6,
In the first surface, a protrusion is formed in a portion in contact with the first inner roller to protrude in the direction of the first inner roller and extend in the vertical direction. 8. The method of claim 7,
An air conditioner in which a roller groove recessed inward to insert the protrusion or the protrusion is formed on each of the circumferential surfaces of the first inner roller and the first outer roller. The method of claim 1,
The vane is
and a guide panel for changing a wind direction of the air flowing along the discharge passage, and a connector disposed on one side of the guide panel to move the guide panel,
The first roller is disposed to be in contact with the guide panel, and the second roller is rotatably disposed on the connector. 10. The method of claim 9,
The guide panel includes a first surface for guiding a wind direction of the air flowing through the discharge passage and a second surface formed in a direction opposite to the first surface,
The connector includes an inner wall forming a plane parallel to the guide panel, an outer wall spaced apart from the inner wall in a radial direction outward, and a connecting wall connecting the inner wall and ends of the outer wall,
The first roller includes a first inner roller in contact with the first surface and a first outer roller in contact with the second surface,
The second roller may include a second inner roller rotatably disposed on the inner wall and a second outer roller rotatably disposed on the outer wall. 11. The method of claim 10,
In the housing, a vane space in which the vane is accommodated, and a vane hole formed at one side of the vane space so that the vane protrudes out of the housing are formed,
The housing includes a peripheral wall that forms one side of the vane space and is formed parallel to the inner wall, and an end wall that is bent at the upper end of the peripheral wall and contacts the upper end of the connector to limit movement of the vane in one direction. and a supporter disposed in the vane space and extending downward from the end wall so as to be disposed parallel to the other side of the vane,
The second inner roller is in contact with the peripheral wall, and the second outer roller is in contact with the supporter. 12. The method of claim 11,
The first inner roller is disposed below the second outer roller,
The first outer roller is an air conditioner disposed below the second inner roller. 11. The method of claim 10,
The vane forms a convex curved surface in the outward direction,
The first inner roller and the second outer roller are disposed in the longitudinal center of the vane. 14. The method of claim 13,
The first outer roller is provided with a pair spaced apart from the first inner roller in the longitudinal direction of the vane left and right;
and the second inner roller is provided with a pair spaced apart from the second outer roller in the longitudinal direction of the vane left and right.

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