KR20160034745A - Swash plate compressor with a solid shaft - Google Patents

Abstract

The present invention relates to a swash plate compressor having a solid shaft. According to an embodiment of the present invention, provided is a swash plate compressor comprising: a cylinder body having multiple cylinders arranged in a radial direction, pistons reciprocating inside the cylinder, cylindrical rotary shaft accommodation parts arranged between multiple cylinders, wherein multiple through-holes for connecting the spaces defined by each of the cylinder and the rotary shaft accommodation part are formed in the rotary shaft accommodation part; a suction port for connecting the outside of the cylinder body with the rotary shaft accommodation part; a discharge port for connecting the discharge space formed inside the cylinder body with the outside; a solid shaft rotationally inserted into the rotary shaft accommodation part, while being spaced from the surface of the rotary shaft accommodation part, to include first and second depressed portions which respectively form parts of suction duct and discharge duct by selectively orienting in accordance with the rotation angle; a swash plate which is mounted slantwise against the solid shaft; first and second heads respectively mounted on both ends of the cylinder body, while forming a discharge chamber for connecting the second depressed portion with the discharge space.

Description

Technical Field [0001] The present invention relates to a swash plate compressor having a solid shaft,

The present invention relates to a swash plate compressor having a solid shaft.

The swash plate compressor is a type of a reciprocating compressor that uses a principle in which a swash plate attached to a rotating shaft is slanted with respect to a rotating shaft, and the outer peripheral portion of the swash plate reciprocates parallel to the shaft. Generally, the swash plate compressor is small in volume and can be easily adjusted in compression capacity by adjusting the inclination angle of the swash plate, and thus it is widely used in automotive air conditioners.

The conventional swash plate compressor includes a plurality of cylinders in the body, a piston disposed inside the cylinder, a piston engaged with the outer periphery of the swash plate, and a rotating shaft for rotating the swash plate. In addition, the front head and the rear head provided at both ends of the body include a suction chamber into which the refrigerant is introduced and a discharge chamber in which the compressed refrigerant is discharged. More specifically, the flow path structure is typically formed with a suction side chamber at the center of the front and rear heads, and the suction side chamber is connected to the piston and the cylinder via a suction flow path formed inside the rotation shaft And communicates with the compression chamber defined. In order to form the suction passage, the rotary shaft has a hollow shape.

Meanwhile, since the rotary shaft includes a connecting portion for connecting to an external power source such as a motor, it is required to have rigidity enough to withstand a compression load. However, it is difficult to secure sufficient rigidity with the hollow rotary shaft, There is a high risk that the boundary portion, that is, the neck portion where the connection portion and the suction passage meet is broken. In order to solve this problem, the diameter of the rotating shaft must be increased, but this causes an increase in volume and weight.

In addition, a valve for selectively connecting the cylinder and the suction chamber and the discharge chamber provided in the front and rear heads must be additionally provided, thus complicating the structure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a swash plate compressor having a rotary shaft having a sufficient rigidity without significantly changing the diameter of a rotary shaft as compared with the prior art.

Another object of the present invention is to provide a swash plate compressor in which productivity can be improved by providing a rotary shaft with a shape that is easy to process.

Another object of the present invention is to provide a swash plate compressor capable of simplifying the entire structure by omitting the valve.

According to an aspect of the present invention, there is provided an internal combustion engine including a plurality of cylinders arranged in a circumferential direction, a reciprocating piston in the cylinder, and a cylindrical rotary shaft accommodating portion disposed between the plurality of cylinders, A cylinder body having a plurality of through holes communicating with a space defined by the respective cylinders and the rotation axis receiving portion; A suction port communicating the outside of the cylinder body with the rotation axis receiving portion, and a discharge port communicating with the outside of the cylinder body from a discharge space formed inside the cylinder body; First and second concave portions that are rotatably inserted into the rotary shaft accommodating portion and spaced apart from a surface of the rotary shaft accommodating portion to form a part of a suction flow path and a discharge flow path selectively opposed to the through holes in accordance with a rotation angle, A solid rotating shaft including a part; A swash plate mounted obliquely to the solid rotating shaft; And first and second heads mounted on both ends of the cylinder body, respectively, and having a discharge chamber communicating the second concave portion and the discharge space.

In the above aspect of the present invention, a valve plate used in a conventional swash plate compressor is omitted, a recess is formed around the rotation axis, and a flow path through which the working fluid can flow into the cylinder or from the cylinder when the recess communicates with the through- It is possible to use a solid-state rotary shaft other than the hollow rotary shaft.

Here, a compression chamber defined by the cylinder and the piston may be disposed on both sides of the swash plate, respectively.

The first and second concave portions may be formed on both sides of the swash plate, respectively.

In addition, the first and second concave portions may have a flat bottom surface.

The discharge chamber may communicate with all of the cylinders sequentially facing each other as the rotation shaft rotates.

Further, the discharge space may be disposed between two adjacent cylinders.

The first recess may extend from the swash plate to the through hole.

In addition, the second recess may extend from the through-hole to the discharge chamber.

Also, the cylinder body may be formed by coupling the first and second cylinder bodies.

Here, the first cylinder body may include a partition wall on a surface facing the first head, and a sleeve communicating with the rotation axis receiving portion may be provided at a central portion of the partition wall.

In addition, a space formed between the sleeve and the second concave portion may communicate with a discharge chamber formed in the first head.

The second cylinder body may include a partition wall on a surface facing the second head, and a sleeve communicating with the rotation axis receiving portion may be provided at a central portion of the partition wall.

Further, a space formed between the sleeve and the second concave portion may communicate with a discharge chamber formed in the second head.

According to still another aspect of the present invention, there is provided a rotary compressor comprising: a plurality of cylinders arranged in a circumferential direction; a reciprocating piston in the cylinder; and a cylindrical rotary shaft accommodating portion disposed between the plurality of cylinders, A cylinder body having a plurality of through holes communicating with a space defined by the cylinder of the rotary shaft receiving portion and the cylinder of the cylinder body; A through hole and a suction flow path for guiding a working fluid introduced into the cylinder body into the cylinder and a discharge flow path for discharging the compressed working fluid in the cylinder outside the cylinder body are defined together with the rotation axis accommodating portion Solid rotating shaft; And a swash plate mounted obliquely with respect to the solid rotary shaft, wherein the suction passage and the discharge passage are communicated and blocked sequentially as the rotary shaft rotates with respect to the cylinder.

Here, the suction passage and the discharge passage may be disposed between the outer surface of the rotating shaft and the inner surface of the rotating shaft receiving portion, and extend along the longitudinal direction of the rotating shaft.

Further, the rotation shaft may include first and second concave portions defining the suction passage and the discharge passage.

According to aspects of the present invention having the above-described structure, since a flow path for supplying a working fluid to the cylinder or discharging a working fluid from the cylinder is formed on the outer surface of the rotating shaft, the conventional hollow rotating shaft is not used, .

Further, as compared with the case where the flow path is formed inside the rotating shaft, the flow path can be formed simply by machining the outer surface of the rotating shaft, so that it is possible to reduce the time and cost required for the rotating shaft processing, So that the deterioration can be minimized.

Further, since the conventional valve plate is not used, the structure of the product can be simplified and reliability can be improved.

1 is a cross-sectional view showing a first embodiment of a swash plate compressor according to the present invention.
Fig. 2 is a partial cutaway view showing the internal structure of the first embodiment shown in Fig. 1. Fig.
3 is a side view showing a rotation axis included in the first embodiment shown in FIG.
4 is a perspective view illustrating the rear cylinder body included in the first embodiment shown in FIG.
5 is a perspective view showing the internal structure of the rear cylinder body of FIG.
FIG. 6 is a perspective view showing a front cylinder body included in the first embodiment shown in FIG. 1. FIG.
FIG. 7 is a perspective view showing the internal structure of the front cylinder body of FIG. 6;
8 is a perspective view illustrating a front head included in the first embodiment.
9 is a perspective view showing a rear head provided in the first embodiment.

Hereinafter, an embodiment of a swash plate compressor according to the present invention will be described with reference to the accompanying drawings.

Referring to Figures 1 and 2, a first embodiment 10 of a swash plate compressor according to the present invention is shown. In the first embodiment 10, the front cylinder body 100 and the rear cylinder body 200 are coupled to each other to form a single cylinder body. The front cylinder body 100 includes a cylinder 110 into which a piston to be described later is reciprocably inserted.

Although only one cylinder is shown in Fig. 1, actually, five cylinders are disposed along the circumferential direction. Of course, the number of the cylinders can be arbitrarily changed. The rear cylinder body 200 is provided with a cylinder 210 arranged in line with the cylinder provided in the front cylinder body. A piston is also inserted into the cylinder 210 so as to be reciprocally movable. This will be described later.

A front head 300 and a rear head 400 are mounted on the front and rear cylinder bodies, respectively. A discharge chamber, which will be described later, is provided in the front and rear heads 300 and 400 so that the compressed working fluid can be discharged to the outside of the cylinder body.

A rotating shaft (500) is rotatably mounted inside the cylindrical body. A swash plate 600 is disposed at an approximately center portion of the rotary shaft 500 so as to be inclined with respect to the rotary shaft and the rotary shaft and the swash plate are coupled by a hub 602 provided at the center of the swash plate 600. Here, the swash plate may be fixed to have a fixed angle, or may be configured to adjust the compression capacity by changing the angle with the rotation axis by an arbitrary angle adjusting means.

The piston assembly is coupled to the outer circumference of the swash plate 600. Specifically, the piston assembly includes a coupling portion 604 configured to move in the left-right direction (reference in FIG. 1) of the swash plate while freely rotating the swash plate 600, A piston 608, 610 is provided. Since the two cylinders 110 and 210 are aligned in a line, the two pistons 608 and 610 can advance or retract together in the respective cylinders. Accordingly, the first embodiment constitutes a so-called double head swash plate compressor, but in some cases, the cylinder and the piston may be provided on only one side.

Meanwhile, a rear sleeve 120 (see FIGS. 4 and 5) is formed inside the rear cylinder body 100 to support the vicinity of one end of the rotation shaft. The rear sleeve 120 has a substantially cylindrical shape and is formed to have substantially the same inner diameter as the outer diameter of the rotating shaft. Further, a through hole 122 passing through the rear sleeve 120 is further formed. The through hole 122 is formed to communicate the inside of the rear sleeve 120 and the cylinder 110.

A partition wall 130 is formed at the rear-head-side end of the rear cylinder body 100. The partition 130 is formed to close each of the cylinders 110 and the rear sleeve 120 is formed to protrude from the partition 130 by a predetermined distance. In addition, a discharge space 140 is formed between two adjacent cylinders of the respective cylinders, and the discharge space 140 is formed to penetrate the partition 130. Accordingly, the discharge space 140 communicates with the discharge chamber formed in the rear head to be described later. A discharge muffler 150 communicating with the discharge space is provided at one side of the rear cylinder body, and a discharge port 152 is formed in the discharge muffler 150.

6 and 7) is provided with a front sleeve 220 in which the other end of the rotation shaft is supported. The front sleeve 220 is basically similar to the rear sleeve 220 in the front cylinder body 200 . The front sleeve 220 is also provided with a through hole 222 communicating with the cylinder 210 and protruded from the partition 230 provided on the surface facing the front head. Common.

The discharge space 240 formed between the adjacent two cylinders 210 of the front cylinder body 200 communicates with the discharge space 140 provided in the rear cylinder body 100. Accordingly, the compressed working fluid that has passed through the discharge space formed in the front cylinder body 200 is configured to be discharged to the outside through the discharge muffler and the discharge port. The front cylinder body 200 is further provided with a mount portion 250 for fixing the first embodiment to an object such as a vehicle and has a suction port communicated with a suction space formed inside the cylinder body 252 are also formed.

The suction space 260 is formed between the front and rear cylinder bodies, and specifically refers to a cylindrical space formed between the front and rear sleeves. The above swash plate is disposed in the suction space 260, and the remaining space except for the swash plate acts as a space where the working fluid inhaled temporarily. The suction port 252 penetrates the outer wall of the rear cylinder body and is formed to communicate with the suction space 260 to guide the working fluid into the suction space.

Referring to FIG. 3, a rotating shaft 500 is shown rotatably mounted within the cylindrical body. The rotary shaft 500 has a substantially cylindrical shape of a solid shape. The rotation shaft 500 includes a shaft 510 to which the swash plate is coupled, a spline 520 coupled to an external power source to rotate the rotation shaft, and a shaft 520 coupled to the shaft 510 and the spline 520. [ Shaped tapered neck portion 530 as shown in FIG.

The shaft 510 is in contact with the inner surfaces of the front and rear sleeves so that the rotating shaft can be rotatably supported in the cylinder body. The shaft portion 510 is formed with first concave portions 540 and 542 and second concave portions 550 and 552. Each of the recesses is recessed from the circumferential surface by polishing the outer circumferential surface of the shaft portion in a planar shape. As a result, a space is formed between each of the inner surfaces of the sleeves and the concave portion, and the space thus formed can function as a flow path of the working fluid.

Specifically, the first recess extends from a hub (602) of the swash plate to a lower portion of the through hole, and the second recess extends from a lower portion of the through hole to an outer end of the front and rear sleeves. Accordingly, the working fluid existing between the first concave portion and the sleeve inner surface can flow into the cylinder due to the backward movement of the piston when the first concave portion faces the through hole, thereby forming a part of the suction flow path . In addition, the space between the second concave portion and the sleeve inner surface can discharge the compressed working fluid from the instant cylinder when the second concave portion faces the through-hole due to the pressure caused by the forward movement of the piston, Can be formed. At this time, the width of the first and second concave portions and the position on the circumference can be determined by a person skilled in the art in consideration of the position and the number of the respective cylinders and the stroke of the piston.

Referring to FIG. 8, the front head 300 is shown. The front head 300 is formed with a sleeve 302 in which a spline portion 520 of the rotating shaft is inserted in the center of the front head 300. An outer surface of the sleeve 302 is provided with a discharge chamber 310 are formed. The sleeve 302 is provided with a neck portion 304 at an end opposite to the front cylinder body and an end portion of the front sleeve is inserted and fixed inside the neck portion 304.

A plurality of grooves 306 are formed in the enlarged diameter portion 304. The grooves 306 extend radially outwardly of the sleeve 302 and extend in the longitudinal direction of the sleeve 302 . Accordingly, the compressed working fluid discharged through the front sleeve and the second concave portion can be introduced into the discharge chamber 310 through the enlarged diameter portion 304 and the groove 306.

Here, it can be seen that the working fluid discharged from all the cylinders provided in the front cylinder body flows into the one discharge chamber 310. The discharge chamber 310 has a volume larger than the volume of each cylinder, and receives the working fluid discharged from the cylinder sequentially in accordance with the rotation of the rotating shaft, so that it functions as a kind of muffler. Accordingly, pulsation of the working fluid can be reduced by using the discharge chamber 310 even if a separate muffler is not provided.

Referring to FIG. 9, the rear head 400 is shown. The rear head 400 is formed with a sleeve insertion portion 410 through which the end of the sleeve 120 of the rear cylinder body is inserted into the center of the rear head 400. The front end of the front head 300 is inserted into the inner circumferential surface of the sleeve insertion portion 410, A plurality of grooves 412 are formed so that the compressed working fluid can pass therethrough. In addition, a discharge chamber 430 is formed on the outer periphery of the sleeve insertion portion 410, similar to the front head 300. Here, the discharge chambers 430 formed in the front head and the rear head respectively communicate with the discharge spaces 140 and 240 formed in the cylinder body. Accordingly, the working fluids discharged from the cylinders provided in the front and rear cylinder bodies pass through the discharge chambers 310 and 430, respectively, and then flow into the discharge space and finally discharged to the outside through the discharge port.

The discharge chamber 420 provided in the rear head is formed not only larger than the cylinder but also communicates with all the cylinders provided in the rear cylinder body, thereby contributing to the reduction of pulsation.

A mounting portion 430 is formed on the outer circumferential surface of the rear head 400 to mount the first embodiment to a vehicle or the like.

Now, the operation of the first embodiment will be described.

The working fluid flowing through the suction port 252 is collected in the suction space 260. The working fluid present in the suction space 260 also flows between the front and rear sleeves 120 and 220 and the first concave portions 540 and 542 of the rotating shaft. In this state, when the external power is supplied to rotate the rotation shaft, one end of the first concave portion opposes the through holes 122, 222.

At this time, the circumferential position of the first concave portion is set so that the piston moves from the top dead center to the bottom dead center when the first concave portion starts to face the through hole. Accordingly, due to the retraction of the piston, a negative pressure is formed inside the cylinder, so that the working fluid existing in the first concave portion is sucked into the cylinder.

The width of the first concave portion is set so that the through hole does not face the first concave portion when the piston reaches the bottom dead center. Then, when the rotating shaft continues to rotate, the through hole is closed by the shaft portion of the rotating shaft, so that the working fluid introduced into the cylinder is compressed as the piston advances.

When the rotation shaft further rotates, the second concave portions 550 and 552 start to face the through holes. Here, the circumferential position of the second concave portion is set so as to start to face the through-hole before the piston reaches the vicinity of the image front. The width of the second concave portion is set so as not to face the through hole immediately after the piston reaches the top dead center. Therefore, when the second concave portion starts to face the through-hole, the compressed working fluid in the cylinder is discharged to the outside of the cylinder through the through-hole and flows into the discharge chamber provided in the front or rear head as described above . Here, the compression ratio of the working fluid can be adjusted by adjusting the position and the width of the second concave portion.

The working fluid thus introduced into the discharge chamber flows through the discharge space into the discharge muffler 150 provided in the front cylinder body, and then is discharged to the outside through the discharge port 152. [ Here, the discharge muffler 150 may be replaced with the discharge chamber, so that it may be omitted in some cases.

An example in which the discharge space and the discharge muffler are omitted can also be considered. In this case, the discharge ports may be formed to communicate with the discharge chambers provided in the front head and the rear head, respectively.

It is also possible to consider a configuration in which the working fluid discharged from the second concave portion is directly discharged to a separate discharge chamber instead of the front or rear head. In this case, the front or rear head may be omitted.

Claims (16)

A plurality of cylinders arranged in a circumferential direction, a reciprocating piston in the cylinder, and a cylindrical rotation axis accommodating portion disposed between the plurality of cylinders, wherein the rotation axis accommodating portion is provided with the respective cylinders and the rotation axis accommodating portion A cylinder body having a plurality of through holes communicating with a defined space;
A suction port communicating the outside of the cylinder body with the rotation axis receiving portion, and a discharge port communicating with the outside of the cylinder body from a discharge space formed inside the cylinder body;
First and second concave portions that are rotatably inserted into the rotary shaft accommodating portion and spaced apart from a surface of the rotary shaft accommodating portion to form a part of a suction flow path and a discharge flow path selectively opposed to the through holes in accordance with a rotation angle, A solid rotating shaft including a part;
A swash plate mounted obliquely to the solid rotating shaft; And
And first and second heads mounted on both ends of the cylinder body, respectively, and having a discharge chamber communicating the second concave portion and the discharge space. The method according to claim 1,
And compression chambers defined by the cylinder and the pistons are disposed on both sides of the swash plate, respectively. 3. The method of claim 2,
And the first and second concave portions are formed on both sides of the swash plate, respectively. The method according to claim 1,
Wherein the first and second recesses have flat bottom surfaces. The method according to claim 1,
Wherein the discharge chamber communicates with all the cylinders sequentially opposed to each other in accordance with rotation of the rotation shaft. The method according to claim 1,
Wherein the discharge space is disposed between two adjacent cylinders. The method according to claim 1,
And the first concave portion extends from the swash plate to the through hole. The method according to claim 1,
And the second concave portion extends from the through-hole to the discharge chamber. The method according to claim 1,
Wherein the cylinder body is formed by coupling the first and second cylinder bodies. 10. The method of claim 9,
Wherein the first cylinder body includes a partition wall on a surface facing the first head, and a sleeve communicating with the rotation axis receiving portion is provided at a central portion of the partition wall. 11. The method of claim 10,
And a space formed between the sleeve and the second concave portion communicates with a discharge chamber formed in the first head. 10. The method of claim 9,
Wherein the second cylinder body includes a partition wall on a surface facing the second head, and a sleeve communicating with the rotation axis receiving portion is provided at a central portion of the partition wall. 13. The method of claim 12,
And a space formed between the sleeve and the second concave portion communicates with a discharge chamber formed in the second head. A plurality of cylinders arranged in a circumferential direction, a reciprocating piston in the cylinder, and a cylindrical rotation axis accommodating portion disposed between the plurality of cylinders, wherein the rotation axis accommodating portion is provided with the respective cylinders and the rotation axis accommodating portion A cylinder body having a plurality of through holes communicating with a defined space;
A through hole and a suction flow path for guiding a working fluid introduced into the cylinder body into the cylinder and a discharge flow path for discharging the compressed working fluid in the cylinder outside the cylinder body are defined together with the rotation axis accommodating portion Solid rotating shaft; And
And a swash plate mounted obliquely with respect to the solid rotating shaft,
Wherein the suction passage and the discharge passage are sequentially communicated and blocked with respect to the cylinder as the rotary shaft rotates. 15. The method of claim 14,
Wherein the suction passage and the discharge passage are disposed between an outer surface of the rotating shaft and an inner surface of the rotating shaft receiving portion and extend along the longitudinal direction of the rotating shaft. 16. The method of claim 15,
Wherein the rotary shaft includes first and second concave portions defining the suction passage and the discharge passage.

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