KR101899032B1

KR101899032B1 - Refrigerant suction structure of swash plate type compressor

Info

Publication number: KR101899032B1
Application number: KR1020140155814A
Authority: KR
Inventors: 정상호; 심우신; 고경환; 이재욱
Original assignee: 이래오토모티브시스템 주식회사
Priority date: 2014-11-11
Filing date: 2014-11-11
Publication date: 2018-09-14
Also published as: KR20160056002A

Abstract

SUMMARY OF THE INVENTION It is a technical object of the present invention to provide a suction structure of a swash plate type compressor in which suction valve leads are eliminated to improve mechanical efficiency and cooling efficiency, and also to reduce the number and weight of assembly processes. To this end, the refrigerant suction structure of the swash plate type compressor of the present invention includes a cylinder block having a cylinder bore and a shaft bore formed therein, a shaft rotatably mounted on the shaft yoke and fixed to the swash plate through a swash plate hub, A thrust bearing for rotatably supporting the cylinder block, and a piston rotatably provided on the swash plate and moving forward or backward in the cylinder bore, wherein the thrust bearing of the cylinder block A leading flow path formed in a recessed portion; A trailing path communicating the shaft bore and the cylinder bore; And an intermediate connecting passage formed in the outer circumferential surface of the shaft and extending in the longitudinal direction of the shaft so that the leading passage and the trailing passage are communicated while the piston is retracted from the cylinder bore.

Description

[0001] The present invention relates to a refrigerant suction structure of a swash plate type compressor,

The present invention relates to a swash plate compressor used for automotive air conditioning and the like.

2. Description of the Related Art Generally, a swash plate type compressor is widely used as a compressor of an air conditioner for an automobile. A swash plate is installed on a shaft to rotate a shaft to convert a swash plate rotational motion into a reciprocating motion of a piston, And compression.

1, a conventional swash plate type compressor is provided with a plurality of cylinder bores 111 each having a shaft hole 112 formed at the center thereof and a circumference with respect to the shaft hole 112, A shaft 130 rotatably installed in a shaft hole 112 of the first and second cylinder blocks 110 and 120 and a shaft 130 rotatably installed in the shaft hole 112 of the first and second cylinder blocks 110 and 120, A swash plate 132 provided in the space between the first and second cylinder blocks 110 and 120 through the swash plate hub 131 and the swash plate hub 131 in the first and second cylinder blocks 110 and 120, First and second thrust bearings 140 and 150 rotatably supporting the first and second thrust bearings 120 and 120 and the first and second thrust bearings 140 and 150 rotatably mounted on the swash plate 132, And a piston 160 reciprocating in a bore 111 of the two cylinder blocks 110 and 120.

1, the conventional swash plate type compressor includes a first cover block 170 provided on a surface of the first cylinder block 110 opposite to the surface facing the second cylinder block 120, And a second cover block 180 provided on the opposite side of the second cylinder block 120 facing the first cylinder block 110. The first and second cover blocks 170 180 are respectively provided with a suction valve lead 191 for introducing the refrigerant into the bore 111 of the first and second cylinder blocks 110 and 120 and the first and second cylinder blocks 110 and 120, And a discharge valve lead 192 for discharging the refrigerant of the bore 111 of the compressor.

Accordingly, in the conventional swash plate type compressor, the piston 160 is repeatedly retreated and advanced while the swash plate 132 is rotated together with the shaft 130. When the piston 160 is moved to the bore of the first cylinder block 110 The piston 160 is retracted from the bore of the second cylinder block 120. When the piston 160 retracts from the bore of the first cylinder block 110, When the piston 160 retracts, the suction valve lead 191 opens to allow the refrigerant to flow into the cylinder bore 111. When the piston 160 advances, the suction valve lead 191 191 are closed and the refrigerant is compressed in the cylinder bore 111. When the compression is completed, the discharge valve lead 192 is opened and the compressed refrigerant is discharged in the next cycle.

However, in the conventional swash plate type compressor, the suction valve lead 191 acts as a resistance against the refrigerant flow when the piston 160 retracts (i.e., when the refrigerant is sucked), resulting in a reduction in mechanical efficiency and cooling efficiency, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a refrigerant suction structure of a swash plate type compressor which can eliminate the suction valve lead to improve the mechanical efficiency and the cooling efficiency and reduce the number and weight of the assembly process.

In order to achieve the above object, a refrigerant suction structure of a swash plate compressor according to an embodiment of the present invention includes a cylinder block having a cylinder bore and a shaft bore formed therein, a cylinder block rotatably mounted on the shaft yoke, A thrust bearing which rotatably supports the swash plate hub on the cylinder block and a piston which is rotatably mounted on the swash plate and moves forward or backward in the cylinder bore, A leading passage formed in the cylinder block by being recessed in a portion where the thrust bearing is placed; A trailing path communicating the shaft bore and the cylinder bore; And an intermediate connecting channel formed to be recessed on an outer circumferential surface of the shaft and elongated in a longitudinal direction of the shaft so that the leading passage and the trailing passage are communicated while the piston is retracted from the cylinder bore, And an end portion of the intermediate connecting passage adjacent to the trailing passage is formed to be inclined with respect to the central axis of the shaft and is inclined in a direction in which the trailing passage faces A bushing member is further provided on an inner circumferential surface of the shaft bushing to smooth the rotation of the shaft and to maintain airtightness with the outer circumferential surface of the shaft, and a bore corresponding to the trailing bushing is formed in the bushing member .

When the piston is retracted by the rotation of the shaft, the front passage and the rear passage are communicated by the intermediate connection passage so that the refrigerant flows through the preceding passage, the intermediate connection passage, and the following passage sequentially to the cylinder bore Wherein when the piston is advanced by rotation of the shaft, the front passage and the rear passage are closed by the outer circumferential surface of the shaft on which the intermediate connection passage is not formed, so that the refrigerant sucked into the cylinder bore is prevented from leaking And can be compressed in the cylinder bore.

delete

As another example, a coating layer may be formed on the inner circumferential surface of the shaft hole to smooth the rotation of the shaft and to maintain airtightness with the outer circumferential surface of the shaft.

As another example, a coating layer may be formed on the outer circumferential surface of the shaft to smoothly rotate the shaft relative to the inner circumferential surface of the shaft yoke and to maintain airtightness with the inner circumferential surface of the shaft yoke.

The refrigerant suction structure of the swash plate type compressor according to a modification of the embodiment of the present invention includes a first cylinder block in which a first cylinder bore and a first shaft bore are formed and a second cylinder block in which a second cylinder bore and a second bore are formed, A shaft fixed to the swash plate through a swash plate hub, the first and second swash plate hubs being rotatably supported by the first and second shaft yokes; A second thrust bearing, and a double-headed piston which is rotatably provided on the swash plate and moves forward or backward in the first and second cylinder bores, the refrigerant suction structure of the swash plate type compressor comprising: A first leading passage formed by being recessed in a portion where one thrust bearing is placed; A first trailing oil passage communicating the first shaft hole and the first cylinder bore; A first intermediate connecting passage formed to be recessed on an outer circumferential surface of the shaft and elongated in the longitudinal direction of the shaft so that the first preceding passage and the first following passage are communicated while the piston is retracted from the first cylinder bore; A second leading passage formed by being recessed in a portion of the second cylinder block where the second thrust bearing is placed; A second trailing path communicating the second shaft hole and the second cylinder bore; And a second intermediate connection channel formed to be elongated in the longitudinal direction of the shaft so that the second front passage and the second rear passage are communicated with each other while the piston is retracted from the second cylinder bore, And the first preceding passage may be formed to be recessed in the longitudinal direction of the first cylinder block and the second preceding passage may be formed to be recessed in the longitudinal direction of the second cylinder block , The end portion of the first intermediate connecting passage adjacent to the first following passage may have a shape inclined with respect to the central axis of the shaft and inclined in a direction in which the first following passage faces, Wherein an end portion of the second intermediate connecting passage adjacent to the second following flow passage has a shape inclined with respect to the central axis of the shaft, A first bushing member may be further provided on the inner circumferential surface of the first shaft bushing to smoothly rotate the shaft and maintain airtightness with the outer circumferential surface of the shaft. And the first bushing member may be formed with a first through hole corresponding to the first rear flow passage, the inner circumferential surface of the second bush hole may be provided with an outer circumferential surface of the shaft, A second bushing member may be further provided to maintain airtightness of the second bushing member, and a second bore corresponding to the second rear flow passage may be formed in the second bushing member.

The second intermediate connection passage may be rotationally symmetrical with respect to the first intermediate connection passage by 180 degrees with respect to the shaft.

As described above, the refrigerant suction structure of the swash plate compressor according to the embodiment of the present invention can have the following effects.

According to the embodiment of the present invention, there is provided a technology structure including a leading passage formed in a cylinder block, a trailing passage, and an intermediate connecting passage formed in the shaft, so that when the piston is retracted, And the rear flow passage, the present invention can replace the conventional intake valve lead with this technical configuration, thereby improving the mechanical efficiency and cooling efficiency, There is a remarkable effect of reducing weight. Ultimately, it is possible to raise fuel efficiency while lowering the product price.

1 is a cross-sectional view schematically showing a conventional swash plate type compressor.
2 is a cross-sectional view schematically showing a swash plate type compressor to which a refrigerant suction structure of a swash plate compressor according to an embodiment of the present invention is applied.
3 is a perspective view showing the first cylinder block of the swash plate compressor of FIG.
Fig. 4 is a plan view showing the first cylinder block of Fig. 3. Fig.
5 is a cross-sectional view of the first cylinder block of FIG. 4 taken along the line VV.
FIG. 6 is a view showing a shaft of the swash plate compressor of FIG. 2;
7 is a cross-sectional view schematically showing a modification of the airtight structure between the shaft hole and the shaft.
8 is a cross-sectional view schematically showing another modification of the airtight structure between the shaft hole and the shaft.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

2 is a cross-sectional view schematically showing a swash plate type compressor to which a refrigerant suction structure of a swash plate compressor according to an embodiment of the present invention is applied.

FIG. 3 is a perspective view showing the first cylinder block of the swash plate type compressor of FIG. 2, FIG. 4 is a plan view of the first cylinder block of FIG. 3, And Fig. 6 is a view showing the shaft of the swash plate compressor of Fig.

1 to 6, a refrigerant suction structure of a swash plate compressor according to an embodiment of the present invention includes a first cylinder block 210, a shaft 230, a first thrust bearing 240, And a piston 260. The refrigerant suction structure includes a first front passage 271, a first rear passage 272, and a first intermediate connecting passage 273.

The first cylinder block 210 is formed with a first cylinder bore 211 and a first shaft bore 212 as shown in FIGS. In the first cylinder bore 211, the piston 260 reciprocates while advancing or retreating, and the shaft 230 is rotatably mounted on the first shaft hole 212.

2, the shaft 230 is rotatably provided in the first shaft hole 212 and is fixed to the swash plate 232 through a swash plate hub 231. [ When the shaft 230 is rotated by the driving unit 10, the swash plate 232 is rotated together with the shaft 230 so that the piston 260 rotatably mounted on the swash plate 232 is rotated by the first cylinder bore 211, .

The first thrust bearing 240 serves to rotatably support the swash plate hub 231 to the first cylinder block 210 with respect to the axial direction of the shaft 230 as shown in FIG.

As shown in FIG. 2, the piston 260 is rotatably mounted on the swash plate 232, and reciprocates while advancing or retracting from the first cylinder bore 211.

The first preceding passage 271 is formed by being recessed in a portion of the first cylinder block 210 where the first thrust bearing 240 is placed, as shown in FIGS. Particularly, the second leading passage 274 is formed so as to communicate with the first trailing passage 272 when the first intermediate connecting passage 273 is positioned therein, as shown in Figs. 2 to 5, And is connected to the yoke 212.

The first rear flow passage 272 communicates the first shaft hole 212 and the first cylinder bore 211 as shown in Figs. 2, 3 and 5. 2, the refrigerant flowing into the inside of the swash plate type compressor is supplied to the first intermediate flow path 273 through the first intermediate flow path 273, The first fluid passage 271 and the first fluid passage 272 can be sucked into the first cylinder bore 211 corresponding to the low pressure portion in succession through the first fluid passage 271, the first intermediate fluid passage 273, and the first fluid passage 272 The arrows are long for the second cylinder block 220 to be described later, but the suction process of the refrigerant is the same as that of the first cylinder block 210, see the solid line arrows in Fig. 2).

The first intermediate connecting passage 273 is formed to be recessed on the outer circumferential surface of the shaft 230 and is connected to the first connecting passage 271 and the first connecting passage 271 while the piston 260 is retracted from the first cylinder bore 211 272 are communicated with each other.

2, refrigerant is sucked into the first cylinder bore 211 through the first leading passage 271, the first trailing passage 272, and the first intermediate connecting passage 273, The process of being compressed in the bore 211 will be described. 2 is longer than that of the second cylinder block 220 to be described later, but the suction process of the coolant is the same as that of the first cylinder block 210, so that the explanation will be made with reference to the solid arrows of FIG. 2 .

2, when the piston 260 is retracted (that is, when the refrigerant is sucked) due to the rotation of the shaft 230, the first intermediate connecting passage 273 connects the first leading passage 271 and the first trailing passage 271, The refrigerant can be sucked into the first cylinder bore 211 through the first leading passage 271, the first intermediate connecting passage 273 and the first trailing passage 272 in succession, The first intermediate oil passage 273 is not formed in the shaft 230 and the first oil passage 271 is formed by the outer peripheral surface on which the first intermediate connection passage 273 is not formed when the piston 260 is advanced by the rotation of the shaft 230 And the first following passage 272 are closed so that the refrigerant sucked into the first cylinder bore 211 can be compressed in the first cylinder bore 211 without leaking Although not shown in FIG. 2, it is referred to as a dotted arrow in FIG. 2, assuming that compression is completed).

Therefore, a technique including a first intermediate passage 273 formed in the shaft 230 and a first leading passage 271 formed in the first cylinder block 210, a first trailing passage 272, The refrigerant is sucked into the first cylinder bore 211 through the first leading passage 271, the first intermediate connecting passage 273 and the first trailing passage 272 during the retraction of the piston 260, (191 in FIG. 1) can be eliminated and replaced with this technical configuration, so that the mechanical efficiency and cooling efficiency can be improved, and the number and weight of the assembling process can be reduced There is a remarkable effect.

For example, as shown in FIGS. 3 and 4, when the five first cylinder bores 211 are provided along the perimeter of the first shaft hole 212 as shown in FIG. 3 and FIG. 4, 5 and 5 may be formed so as to lie between the respective first cylinder bores 211 as shown in Figs. 3 and 4, and the above-described first following flow path 272 may be formed as shown in Figs. 3 and 4, As shown in FIG. 5, five holes may be formed to communicate the first cylinder bores 211 and the first shaft holes 212, respectively.

Hereinafter, the refrigerant suction structure of the swash plate type compressor according to the embodiment of the present invention will be described in more detail with reference to FIGS. 2 and 6 again.

Prior to the description, the swash plate type compressor may further include a second cylinder block 220 and a second thrust bearing 250 as shown in FIG. The second cylinder block 220 is formed with the second cylinder bore 221 and the second shaft bore 222 in the same manner as the first cylinder block 210 described above. The second thrust bearing 250 rotatably supports the swash plate hub 231 with respect to the axial direction of the shaft 230 to the second cylinder block 220.

When the swash plate type compressor further includes the second cylinder block 220 and the second thrust bearing 250, the piston 260 becomes a double-headed piston having a double head, and according to an embodiment of the present invention 2 and 6, the refrigerant suction structure of the swash plate type compressor further includes a second leading passage 274, a second trailing passage 275, and a second intermediate connecting passage 276 can do.

The second leading passage 274 is formed by being recessed in a portion of the second cylinder block 220 where the second thrust bearing 250 is placed and has the same structure as the first leading passage 271 described above.

The second trailing passage 275 communicates the second shaft hole 222 and the second cylinder bore 221 and has the same structure as the first trailing passage 272 described above.

2 and 6, the second intermediate connecting passage 276 is formed by being recessed on the outer circumferential surface of the shaft 230, while the piston 260 is retracted from the second cylinder bore 221, And is formed long in the longitudinal direction of the shaft 230 so that the leading passage 274 and the second trailing passage 275 are communicated with each other.

In particular, the second intermediate connection passage 276 may be rotationally symmetrical with respect to the first intermediate connection passage 273 by 180 degrees with respect to the shaft 230 as shown in FIG. When the first leading passage 271 and the first trailing passage 272 are connected by the first intermediate connecting passage 273 while the shaft 230 is rotated, the second leading passage 274 and the second trailing passage 272, When the second leading passage 274 and the second trailing passage 275 are connected by the second intermediate connecting passage 276, the first leading passage 271 and the first trailing passage 272 are closed, ) Is closed. That is, the first and second intermediate connection passages 273 and 276 serve as valves for opening and closing.

Each of the first and second shaft holes 212 and 222 has a bushing member 281 formed on each inner circumferential surface thereof to smooth the rotation of the shaft 230 and maintain airtightness with the outer circumferential surface of the shaft 230. [ And the bushing member 281 may be provided with a through hole 281a corresponding to the first or second following flow paths 272 and 275, respectively. Therefore, since the airtightness is maintained between the first and second shaft holes 212 and 222 and the shaft 230, the refrigerant can be prevented from leaking during compression, and the refrigerant can be smoothly compressed.

Hereinafter, with reference to FIG. 7, a modification of the airtight structure between the first and second shaft holes 212 and 222 and the shaft 230 will be described.

7 is a cross-sectional view schematically showing a modification of the airtight structure between the shaft hole and the shaft.

As shown in FIG. 7, on the inner circumferential surfaces of the first and second shaft holes 212 and 222, in order to smooth the rotation of the shaft 230 and to maintain the airtightness with the outer circumferential surface of the shaft 230 A coating layer 282 may be formed.

Hereinafter, another modification of the airtight structure between the first and second shaft holes 212 and 222 and the shaft 230 will be described with reference to FIG.

8 is a cross-sectional view schematically showing another modification of the airtight structure between the shaft hole and the shaft.

8, the shaft 230 is smoothly rotated with respect to the inner circumferential surface of the first and second shaft holes 212, 222, and at the same time, the first and second soccer balls 212, A coating layer 283 may be formed to maintain airtightness with the inner circumferential surface of the yoke 212 (222).

As described above, the refrigerant suction structure of the swash plate type compressor according to the embodiment of the present invention can have the following effects.

According to an embodiment of the present invention, a technical constitution including the leading passage 271, the trailing passage 272, and the intermediate connecting passage 273 formed in the cylinder block 210, And the refrigerant is sucked into the cylinder bore 211 through the leading passage 271, the intermediate connecting passage 272 and the trailing passage 273 at the retraction of the piston 260, It is possible to replace the suction valve lead (191 in Fig. 1) with this technical structure, thereby improving the mechanical efficiency and the cooling efficiency, and there is a remarkable effect of reducing the number and weight of the assembly process. Ultimately, it is possible to raise fuel efficiency while lowering the product price.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

210: first cylinder block 211: first cylinder bore
212: first shaft hole 220: second cylinder block
221: first cylinder bore 222: second soccer yoke
230: shaft 231: swash plate hub
232: swash plate 240: first thrust bearing
250: second thrust bearing 260: piston
271: first preceding passage 272: first following passage
273: first intermediate connecting passage 274: second preceding connecting passage
275: second rear flow path 276: second intermediate connection flow path

Claims

A thrust bearing which rotatably supports the swash plate hub on the cylinder block, and a thrust bearing which rotatably supports the swash plate hub on the cylinder block, and a thrust bearing which rotatably supports the swash plate hub on the cylinder block, And a piston which is rotatably provided in the cylinder bore and moves forward or backward in the cylinder bore,
A leading passage formed in the cylinder block by being recessed in a portion where the thrust bearing is placed;
A trailing path communicating the shaft bore and the cylinder bore; And
An intermediate connecting passage formed in the outer circumferential surface of the shaft and extending in the longitudinal direction of the shaft so that the leading passage and the trailing passage are communicated while the piston is retracted from the cylinder bore;
Lt; / RTI >
The pre-
Wherein the cylinder block is formed to be recessed in the longitudinal direction of the cylinder block,
Wherein an end portion of the intermediate connection passage, which is adjacent to the following flow passage,
The shaft having a shape that is inclined with respect to the center axis of the shaft and inclined in a direction in which the trailing path faces,
On the inner peripheral surface of the shaft yoke,
A bushing member is further provided for smoothly rotating the shaft and maintaining airtightness with the outer circumferential surface of the shaft,
In the bushing member,
A through hole corresponding to the following flow path is formed
Refrigerant suction structure of swash plate type compressor.

The method of claim 1,
When the piston is retracted by the rotation of the shaft, the front passage and the rear passage are communicated by the intermediate connection passage so that the refrigerant flows through the preceding passage, the intermediate connection passage, and the following passage sequentially to the cylinder bore Inhaled,
When the piston is advanced by the rotation of the shaft, the front passage and the rear passage are closed by the outer circumferential surface of the shaft on which the intermediate connecting passage is not formed, so that the refrigerant sucked into the cylinder bore is compressed felled
Refrigerant suction structure of swash plate type compressor.

delete

The method of claim 1,
On the inner peripheral surface of the shaft yoke,
A coating layer is formed to smooth the rotation of the shaft and maintain airtightness with the outer circumferential surface of the shaft
Refrigerant suction structure of swash plate type compressor.

The method of claim 1,
On the outer peripheral surface of the shaft,
The shaft is smoothly rotated with respect to the inner circumferential surface of the shaft hole and a coating layer is formed to maintain the airtightness with the inner circumferential surface of the shaft hole
Refrigerant suction structure of swash plate type compressor.

A first cylinder block having a first cylinder bore and a first shaft bore formed therein, a second cylinder block having a second cylinder bore and a second bore formed therein, and a second cylinder block rotatably installed in the first and second sole yokes, First and second thrust bearings rotatably supporting the swash plate hub to the first and second cylinder blocks, respectively, and first and second thrust bearings rotatably mounted on the swash plate, Wherein the refrigerant suction structure of the swash plate type compressor includes a double-headed piston which advances or retreats in the two cylinder bores,
A first leading passage formed in the first cylinder block by being recessed in a portion where the first thrust bearing is placed;
A first trailing oil passage communicating the first shaft hole and the first cylinder bore;
A first intermediate connecting passage formed to be recessed on an outer circumferential surface of the shaft and elongated in the longitudinal direction of the shaft so that the first preceding passage and the first following passage are communicated while the piston is retracted from the first cylinder bore;
A second leading passage formed by being recessed in a portion of the second cylinder block where the second thrust bearing is placed;
A second trailing path communicating the second shaft hole and the second cylinder bore; And
A second intermediate connecting passage formed to be long in the longitudinal direction of the shaft so that the second preceding passage and the second following passage are communicated with each other while the piston is retracted from the second cylinder bore;
Lt; / RTI >
The first preceding passage
Wherein the first cylinder block is formed to be recessed in the longitudinal direction of the first cylinder block,
The second preceding passage
The second cylinder block is formed to be recessed in the longitudinal direction thereof,
And an end portion of the first intermediate connection passage adjacent to the first rear flow passage,
Wherein the shaft has a shape that is inclined with respect to a central axis of the shaft and is inclined in a direction in which the first rear flow path faces,
And an end portion of the second intermediate connection passage, which is adjacent to the second rear flow passage,
The second rear flow path having a shape inclined with respect to the central axis of the shaft and inclined in a direction in which the second rear flow path faces,
On the inner peripheral surface of the first shaft yoke,
A first bushing member is further provided to smooth the rotation of the shaft and maintain airtightness with the outer circumferential surface of the shaft,
In the first bushing member,
A first through hole corresponding to the first following passage is formed,
And an inner circumferential surface of the second shaft yoke,
A second bushing member is further provided to smooth the rotation of the shaft and maintain the airtightness with the outer circumferential surface of the shaft,
In the second bushing member,
And a second through hole corresponding to the second rear flow path is formed
Refrigerant suction structure of swash plate type compressor.

The method of claim 6,
The second intermediate connection channel
Wherein the first intermediate connecting passage is symmetrical with respect to the first intermediate connecting passage by 180 degrees
Refrigerant suction structure of swash plate type compressor.