KR101904002B1 - Swash plate type compressor - Google Patents

Abstract

The present invention relates to a swash plate type compressor, and is characterized in that a suction check valve (500) is installed to prevent vibration noise generated during operation of an opening / closing core (520) for controlling the flow of refrigerant. Such a swash plate type compressor is configured such that the spring S of the suction check valve forms a slope or a step on the spring seating surfaces 515 and 522aa in contact with the opening / closing core 520 or the case 510, The operation of the opening / closing core 520 can be prevented by making a certain portion of the case 510 closely contact with the inner circumferential surface of the case 510.

Description

[0001] SWASH PLATE TYPE COMPRESSOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type compressor, and more particularly, to a swash plate type compressor in which, when an opening degree of a refrigerant pipe introduced into a compressor from a refrigerant line is adjusted through a suction check valve, The present invention relates to a swash plate type compressor capable of stably operating without causing vibration noise due to irregular contact with an inner surface of a case.

Generally, compressors that serve to compress refrigerant in automotive cooling systems have been developed in various forms. Such a compressor includes a reciprocating type in which compression is performed while a refrigerant is compressed and a rotary type in which compression is performed while rotating. In the reciprocating type, there are a crank type in which the driving force of the drive source is transmitted to a plurality of pistons by using a crank, a swash plate type in which the swash plate is transmitted by a swash plate installed shaft, a wobble plate type in which a wobble plate is used, There are vane rotary type, scroll type using revolving scroll and fixed scroll.

Among the above various types of compressors, the swash plate type compressor is driven according to on / off of the air conditioner switch. When the compressor is driven, the temperature of the evaporator is lowered, and when the compressor is stopped, the temperature of the evaporator is raised.

On the other hand, as the swash plate type compressor, there are fixed capacity type and variable capacity type. These compressors are driven by receiving power from the rotational force of the engine of the vehicle. In the fixed capacity type, an electromagnetic clutch is provided to control the operation of the swash plate type compressor. However, in the case of the fixed capacity type having the electromagnetic clutch, there is a problem that the RPM of the vehicle flows when the compressor is driven or stopped, thereby hindering stable vehicle operation.

Therefore, in recent years, a variable displacement type, which is not provided with a clutch, is always driven with the driving of the engine of the vehicle, and can vary the discharge capacity by changing the inclination angle of the swash plate, is widely used. In such a variable displacement swash plate type compressor, a pressure control valve for adjusting the inclination angle of the swash plate is generally used for adjusting the refrigerant discharge amount.

However, in the conventional variable displacement swash plate type compressor, when the suction amount of the refrigerant is reduced, there is a problem that vibration occurs in the suction port and pulsation or roaring occurs.

In order to solve such a problem, a suction check valve 150 shown in FIG. 1 has been proposed in order to gradually change the flow area of the suction port when the suction amount of refrigerant is small to avoid abrupt suction.

The suction check valve 150 includes a case 151, an opening and closing core 153 and a recoil spring 155. The case 151 is a cylindrical body that is opened to serve as a body of the valve 150 And an opening cover 169 is fitted around the opened suction port 161. A discharge port 163 is formed at one side of the side wall surface at a right angle to the suction port 161. [

The opening and closing core 153 is a cylindrical plunger which is installed inside the case 151 so as to be movable in an axial direction and moves up and down inside the case 151 in accordance with the refrigerant pressure applied to the suction port 161, To the discharge port 163, as shown in FIG.

The recoil spring 155 is installed to elastically support the opening / closing core 153 against the pressure of the refrigerant flowing into the case 151 through the suction port 161. The refrigerant pressure The opening / closing core 153 is brought into close contact with the cover 169 so that the suction port 161 can be closed.

The axial groove 171 is formed on the outer peripheral surface of the opening and closing core 153 so that the refrigerant can flow through the axial groove 171 even when the opening and closing core 153 is in close contact with the lid 169 So that a sudden change in the opening of the suction check valve can be prevented even if there is a sudden change in the refrigerant pressure applied to the suction port 161. [

However, since the conventional suction check valve 150 is configured to operate only by the differential pressure between the suction port and the suction chamber of the variable displacement swash plate type compressor, when the differential pressure between the suction port and the suction chamber exceeds a certain limit, Even when the maximum variable operation is not performed, the opening / closing core 153 can be opened to a maximum similar to the case of the maximum variable operation, so that the effect of preventing the occurrence of suction pulsation or noise is insignificant.

In order to solve this problem, in order to adjust the suction amount of the refrigerant flowing into the suction port through the suction check valve, the opening degree of the suction check valve is adjusted not only by the differential pressure between the suction port and the suction chamber but also by the crank chamber pressure An improved suction check valve 250 as shown in FIG. 2 has been proposed so that the occurrence of suction pulsation or roar can be prevented.

The improved suction check valve 250 has a suction port 251a at one side and a discharge port 251b communicating with the suction port 251a when the suction port 251a is opened is passed through the other side, A case 251 in which a guide hole 251d is formed in the other side and a case 251 which is supported inside the case 251 via a spring S so that the flow of refrigerant from the suction port 251a to the discharge port 251b An opening and closing core 252 for adjusting the pressure of the crank chamber 121 and a pressure of the crank chamber 121 is disposed inside the opening and closing core 252 so that the pressure of the crank chamber 121 can be applied to the inside of the opening and closing core 252, And a pressure receiving chamber 253 which penetrates through the guide hole 251d of the case 251 and moves up and down integrally with the opening and closing core 252.

In the case where the above-described improved suction check valve 250 is applied, when the pressure of the suction port is excessive in a state where the inlet port 251b is not maximally variable, the discharge port 251b can be adjusted to the maximum opening degree by the opening / closing core 252 The pressure of the crank chamber 121 acts on the opening / closing core 252 in a direction opposite to the pressure direction of the suction port, so that the final adjusted opening degree can be reduced. As a result, .

However, in the case of the conventional improved suction check valve 250 as described above, it is possible to prevent the occurrence of suction pulsation or noise, which was a problem in variable operation. However, the gap between the side surface of the opening / closing core 252 and the inner surface of the case 251 Gap may cause noise when the opening / closing core 252 is operated.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the problems described above, and it is an object of the present invention to provide an air conditioner in which a spring installed on a suction check valve forms a slope or a step on a spring seating surface, So that it is possible to prevent the generation of noise when the opening / closing core is operated.

According to another aspect of the present invention, there is provided a swash plate compressor including a cylinder block having a plurality of cylinder bores formed therein, a front head disposed in front of the cylinder block and formed with a crank chamber, A rotary shaft mounted on the rotary shaft so as to be rotatable through one side of the rotary shaft; a rotary shaft integrally rotated with the rotary shaft; A swash plate installed so as to be able to vary the angle with respect to the rotation axis so that the swash plate can be adjusted; and a linear reciprocating motion, which is jointly connected to the edge of the swash plate, Thereby compressing the refrigerant sucked through the suction port, A case having a plurality of pistons to be discharged and a case provided on a pipe connecting the suction port to the suction chamber and having a suction port at one side and a discharge port communicating with the suction port when the suction port is opened, Wherein at least one of the spring seating surfaces formed on the case or the opening and closing core has a spring that is slanted at an angle with respect to the spring, Wherein the opening and closing core is reciprocated in a state in which a part of the opening and closing core closely contacts the inner circumferential surface of the case, And the crank chamber is controlled by the differential pressure between the suction port and the suction chamber and the crank chamber, And a suction check valve is provided on the other side of the casing of the suction check valve so that the pressure of the crank chamber can be applied to the inside of the opening / And a pressure receiving chamber which is located inside the core and accommodates the pressure of the crank chamber and moves up and down integrally with the opening and closing core through the guide hole of the case.

Preferably, the spring seating surface formed in the case is formed to be inclined so that the spring can be slanted.

Preferably, a stepped portion is formed on the spring seating surface formed in the case so that the spring can be contacted obliquely.

The spring seating surface formed on the opening / closing core may be formed to be inclined so that the spring can be slanted.

And a stepped portion is formed on the spring seating surface formed on the opening / closing core so that the spring can be slantedly contacted.

Wherein the case is formed of a hollow cylindrical body having one end in the axial direction and one in the transverse direction through which the suction port and the discharge port are respectively passed and the other end surface in the axial direction through the guide hole, And the pressure receiving chamber is formed as a hollow cylinder which moves up and down along the guide hole.

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The swash plate type compressor according to the present invention comprises a cylinder block having a plurality of cylinder bores formed therein, a front head disposed in front of the cylinder block and formed with a crank chamber, A rotary shaft mounted on the rotary shaft so as to rotate integrally with the rotary shaft and adjust the amount of refrigerant discharged from the rotary shaft; A swash plate installed to be capable of varying the angle with respect to the rotation axis and a linear reciprocating motion along an inner circumferential surface of the cylinder bore by the rotation of the swash plate, A plurality of bubbles to be discharged into the discharge chamber by compressing the refrigerant sucked through the discharge port A case which is provided on a conduit connecting the suction port to the suction chamber and through which a suction port is passed through at one side and a discharge port communicating with the suction port is opened at the other side when the suction port is opened; Wherein at least one of the spring seating surfaces formed on the case or the opening and closing core is provided with a spring for supporting the spring at an angle so as to be in contact with the spring, Wherein the opening / closing core is reciprocated in a state in which a part of the opening / closing core closely contacts the inner circumferential surface of the case, A cylinder for connecting the crank chamber and the channel so as to be adjusted by differential pressure between the suction chamber and the crank chamber And the suction check valve is located inside the opening / closing core so that the pressure of the crank chamber can be applied to the inside of the opening / closing core, And a pressure transmitting rod which receives the pressure of the crank chamber and moves up and down integrally with the opening and closing core through the guide hole of the case.

Wherein the case is formed of a hollow cylindrical body having one end in the axial direction and one in the transverse direction through which the suction port and the discharge port are respectively passed and the other end surface in the axial direction through the guide hole, And the pressure transmitting bar is formed as a solid cylinder moving upward and downward along the guide hole, and a pressure surface receiving pressure of the crank chamber is formed at an end of the hollow cylinder. .

According to the above-described swash plate type compressor, since the spring provided on the suction check valve forms a slope or a step on the spring seating surface contacting with the opening / closing core or the case to allow the opening / closing core to closely contact the inner surface of the case, So that the generation of tremble noise can be prevented in the operation of the core.

1 is a perspective view showing a suction check valve employed in a conventional swash plate type compressor.
2 shows an improved suction check valve employed in a conventional swash plate compressor.
3 is a longitudinal sectional view of a swash plate type compressor according to the present invention, showing a swash plate inclined with respect to a rotation axis.
4 is a longitudinal sectional view of a swash plate compressor according to the present invention, showing a swash plate erected in a radial direction of a rotating shaft;
FIG. 5 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a first embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.
6 is a longitudinal sectional view of a suction check valve applied to a swash plate compressor according to a first embodiment of the present invention, showing a state in which the suction port of the suction check valve is opened to the maximum.
7 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a first embodiment of the present invention, in which the suction port of the suction check valve is properly opened.
FIG. 8 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a second embodiment of the present invention, in which the suction port of the suction check valve is properly opened. FIG.
FIG. 9 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a third embodiment of the present invention, in which the suction port of the suction check valve is properly opened; FIG.
10 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a fourth embodiment of the present invention, in which the suction port of the suction check valve is properly opened.
FIG. 11 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a fifth embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.
FIG. 12 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a sixth embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.
FIG. 13 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a seventh embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.
FIG. 14 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to an eighth embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured by the present invention. Also, the thickness of the lines and the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms used are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be based on the entire contents of the present specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a vertical sectional view of a swash plate type compressor according to the present invention, in which a swash plate is inclined with respect to a rotation axis, FIG. 4 is a longitudinal sectional view of the swash plate type compressor according to the present invention, 5 is a longitudinal sectional view of a suction check valve applied to the swash plate type compressor according to the first embodiment of the present invention, showing a state in which the suction port of the suction check valve is closed, and FIG. 6 is a cross- FIG. 7 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to a first embodiment of the present invention, in which the suction port of the suction check valve is opened at maximum; FIG. 8 is a longitudinal sectional view of a suction check valve applied to a compressor, showing a state in which the suction port of the suction check valve is properly opened. FIG.

First, a swash plate compressor according to a first embodiment of the present invention will be described with reference to FIGS. 3 to 7. FIG. The swash plate compressor according to the first embodiment of the present invention roughly includes a housing 100, a rotary shaft 200, a swash plate 300, a plurality of pistons 400, and a suction check valve 500.

The housing 100 is composed of a cylinder block 110, a front head 120 and a rear head 130 as shown in FIGS. 2 and 3, which is an outer body of the swash plate type compressor. Here, the cylinder block 110 is a tubular body disposed at an intermediate portion in the longitudinal direction of the housing 100, and a hollow portion is formed therein to house the plurality of pistons 400 as well as the rotary shaft 200 .

The front head 120 and the rear head 130 are cylinders for closing the open and close ends of the upper cylinder block 110. As shown in FIGS. 3 and 4, the front head 120 includes a cylinder block 110 So that the inclination adjusting mechanism 320 can be received while securing the crank chamber 121 which is the rotating space of the swash plate 300. [

The rear head 130 has a front end open toward the cylinder block 110 and includes a suction chamber 132 for supplying the refrigerant to the cylinder bore 111 of the cylinder block 110 during the suction stroke, A discharge chamber 134 through which the refrigerant in the cylinder bore 111 is discharged is formed. A suction port 131 and a discharge port (not shown), which are connected to the suction chamber 132 and the discharge chamber 134, respectively, are formed on an outer wall surface of the rear head 130. On the other hand, a suction check valve 500 is mounted on the channel 135 connecting the suction port 131 to the suction chamber 132.

3 and 4, the rotating shaft 200 is a means for transmitting the rotational driving force of the external driving source to the inside of the compressor. The rotating shaft 200 penetrates a central portion of the front head 120, And is rotatably mounted. A rotary pulley 140 is coupled to one end of a rotary shaft 200 exposed to the outside of the front head 120 and an external rotary driving force is transmitted to the rotary shaft 200 through the rotary pulley 140 The rotating shaft 200 is rotated.

3, the swash plate 300 is mounted on the rotary shaft 200 in an inclined state. The swash plate 300 is a member for converting the rotational driving force of the rotary shaft 200 into reciprocating linear motion of the piston 400, And rotates together with the rotating shaft 200. At this time, a plurality of shoes 310 are mounted in the circumferential direction of the swash plate 300, and the plurality of pistons 400 are slidably supported by the shoe 310 through the shoe 310.

In particular, the swash plate type compressor shown in FIGS. 3 and 4 is a variable displacement swash plate type compressor. The swash plate type compressor is installed such that the inclination angle of the swash plate 300 is variable, Is 90 DEG, the reciprocation motion of the piston 400 disappears, so that the rotation shaft 200 idles. Conversely, when the swash plate 300 is inclined with respect to the rotary shaft 200 as shown in FIG. 3, the piston 400 reciprocates in the cylinder bore 111 to compress the refrigerant.

The suction check valve 500 installed on the pipeline 135 between the suction port 130 and the suction chamber 132 through which the refrigerant flows from the outside is connected to the suction check valve 500 when the slope of the swash plate 300 approaches 90 °, The amount of inflow of the refrigerant becomes small, and on the contrary, when the inclination becomes smaller than 90 degrees, the inflow amount of the refrigerant increases, thereby increasing the opening degree.

The plurality of pistons 400 are means for compressing the refrigerant while reciprocating in the cylinder bore 111 by the swash plate 300. As shown in FIGS. 3 and 4, And is reciprocated linearly along the inner peripheral surface of the cylinder bore 111 of the cylinder block 110 by the rotation of the swash plate 300, The refrigerant sucked into the cylinder bore 111 through the discharge port 131 is discharged to an external refrigerant line through a discharge port (not shown) of the rear head 130.

In the swash plate type compressor according to the present invention, the suction check valve 500 whose opening degree is adjusted according to the amount of refrigerant flowing through the suction port 131 is connected to the suction chamber 131 through a pipe connecting the suction port 131 to the suction chamber 132 And includes a case 510, an opening / closing core 520, and a pressure receiving chamber 530, as shown in FIG. The suction check valve 500 is mainly controlled by the differential pressure between the suction port 131 of the rear head 130 and the suction chamber 132 and the crank chamber 121 of the front head 120 Is further added to the pressure in the suction chamber 132 and the opening degree adjustment is performed more precisely by the differential pressure between the suction port 131 and the suction chamber 132 and the crank chamber 121. [ The crank chamber 121 and the channel 135 are connected to each other through the passage 136 for precise opening adjustment.

5 to 7, the case 510 includes a channel 135 connecting the suction port 131 to the suction chamber 132, And an O-ring R is provided between the case 510 and the conduit 135 to maintain airtightness.

The case 510 is formed of a hollow cylinder such as a cylindrical body and the lower end of the case 510 is formed in a closed shape except for the guide hole 514 through which the pressure receiving chamber 530 can pass, A cover 513 is attached to the upper end of the opening in the drawing toward the port 131. A suction port 511 is formed at the center of the lid 513 and forms a flow path continuously with the suction port 131. Therefore, when the suction port 511 is opened, the external refrigerant flowing into the suction port 131 enters the inside of the case 510 through the suction port 511.

The opening and closing core 520 is a means for interrupting the flow of the refrigerant passing through the inside of the case 510 so as to control the flow of the refrigerant from the inlet 511 of the case 510 to the outlet 512 The pressure of the refrigerant flowing through the suction port 511 of the case 510 (also the pressure of the suction port 131) and the pressure of the suction chamber 132 (or the pressure of the suction chamber 132 and the pressure of the crank chamber 121) The opening degree of the inlet port 511 and the outlet port 512 of the case 510 is adjusted. Since the axial groove 521 is formed on the outer circumferential surface of the opening and closing core 520 so that the refrigerant flows through the axial groove 521 even when the opening and closing core 520 is in close contact with the lid 513, It is possible to prevent a sudden change in the opening degree of the opening / closing core 520 due to a sudden change in refrigerant pressure applied to the inlet 511.

On the other hand, the opening / closing core 520 is vertically reciprocated within the case 510 As shown in FIGS. 5 and 6, is supported by a spring S inserted into the lower end of the case 510, and the cover 510 of the case 510 513 and the bottom dead center at which the compression of the spring S is no longer possible. The opening / closing core 520 is reciprocally moved up and down inside the case 510. It is preferable that the opening and closing core 520 is formed to be in contact with the inner circumferential surface of the case 510 so as to be able to slide in the axial direction along the inner circumferential surface thereof in order to suppress noise and vibration, The opening / closing core 520 is formed to have a size that can be spaced apart from the inner circumferential surface of the case 510 by a predetermined distance.

The spring S is resilient repulsion means for supporting the opening and closing core 520 as described above and is disposed between the bottom of the inner space of the case 510 and the opening and closing core 520 to support the opening and closing core 520 And serves to repel the opening / closing core 520 against the pressure of the refrigerant flowing through the inlet 511. 5, the opening / closing core 520 is pushed up to the uppermost position so as to be brought into close contact with the lid 513, while the suction port 511 is closed by the suction port 511. In other words, when there is no pressure of the refrigerant acting through the suction port 511, When the pressure of the refrigerant acting through the discharge port 512 is the maximum, the discharge port 512 is maximally compressed toward the bottom of the case 510 as shown in FIG.

The pressure receiving chamber 530 is a means for allowing the pressure of the crank chamber 121 to additionally act on the opening and closing core 520. The pressure receiving chamber 530 includes a suction port 131 The pressure of the crank chamber 121 can be added to the pressure of the suction chamber 132 so as to correspond to the pressure of the suction port 131 so that the pressure of the suction port 131 can be adjusted by the opening and closing core 520 So that the opening of the discharge port 512 can be appropriately adjusted.

The pressure receiving chamber 530 has a space 522a formed therein so that the pressure of the crank chamber 121 can be applied to the inside of the opening and closing core 520. The inside of the opening and closing core 520 And is formed as a hollow cylinder such as a cylindrical body that passes through the guide hole 514 of the case 510 and moves up and down integrally with the opening / closing core 520.

The bottom of the inner space of the case 510, that is, the lower end of the inner space in the drawing, except for the guide hole 514, forms a spring seating surface 515 where the lower end of the spring S contacts. A pressure acting plate 522 receiving the pressure of the suction port 121, the suction chamber 132 and the crank chamber 121 is formed on the upper side of the open / close core 520, A portion of the inner side surface 522a of the valve seat 522 except the portion where the pressure receiving chamber 530 is located forms a spring seating surface 522aa to which the upper end of the spring S abuts.

Meanwhile, in the suction check valve applied to the swash plate type compressor according to the first embodiment of the present invention, the opening / closing core 520 is brought into close contact with one side of the case 510 to operate, 5 to 7, the spring seating surface 515 of the case 510 is formed to be inclined.

In this case, when the spring seating surface 515 of the case 510 is inclined, the lower end of the spring S contacts the spring seating surface 515 at an angle. At this time, As the degree of compression of the left and right springs S varies, an unbalance occurs in the repulsive force of the spring S that elastically supports the opening / closing core 520. [ Accordingly, the opening / closing core 520 is inclined in the direction of arrow A so that a certain portion of the side surface of the opening / closing core 520 is brought into close contact with the inner peripheral surface of the case 510.

When the opening and closing core 520 is reciprocally moved inside the case 510 while a certain portion of the side surface of the opening and closing core 520 is kept in close contact with the inner circumferential surface of the case 510, Even when there is a gap between the inner circumferential surfaces of the case 510, the oscillation noise can be prevented when the opening / closing core 520 reciprocates.

The pressure receiving chamber 530 may be integrally formed with the opening and closing core 520 or may be formed separately from the opening and closing core 520 to be coupled to the opening and closing core 520. When the pressure receiving chamber 530 is formed separately and is coupled to the opening / closing core 520, the pressure receiving chamber 530 may be coupled in various ways. However, considering the manufacturing process and the combined durability of the pressure receiving chamber 530, 520 by insert injection.

The cross-sectional area of the inner side surface 522a of the pressure acting plate 522 of the opening / closing core 520 located on the inner side of the pressure receiving chamber 530 is larger than the sectional area of the outer side surface 522b of the pressure acting plate 522 ) Of the cross-sectional area of the first and second electrodes. This is because the pressure of the crank chamber 121 becomes larger than the pressure of the suction port 121 when the variable operation is performed so that the opening and closing core 520 is raised to the top dead center to prevent the inlet port 511 of the case 510 from being closed .

It is preferable that a decompression means 600 for reducing the pressure of the crank chamber 121 applied to the opening and closing core 520 is further provided between the crank chamber 121 and the conduit 135. When the opening / closing core 520 is raised to the top dead center due to an abrupt pressure increase of the crank chamber 121, the inlet 511 of the case 510 may be closed, It is necessary to prevent the pressure in the crank chamber 121 from being excessively increased in the core 520. The depressurizing means 600 includes a passage 136 connecting the crank chamber 121 and the pipeline 135, The cross-sectional area of the light-emitting device can be reduced.

When the pressure reducing means 600 is installed between the crank chamber 121 and the conduit 135, the pressure acting plate 522 is positioned inside the pressure receiving chamber 530 of the inner side surface 522a of the pressure acting plate 522 Sectional area of the portion of the pressure acting plate 522 that is greater than 30% of the sectional area of the outer surface 522b of the pressure acting plate 522. [

Hereinafter, with reference to FIG. 8, a swash plate compressor according to a second embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5 described above.

The swash plate type compressor according to the second embodiment of the present invention has the same overall structure as the swash plate type compressor according to the first embodiment of the present invention described above. That is, the housing 100 is installed on the piping 135 connecting the housing 100, the rotary shaft 200, the swash plate 300, the plurality of pistons 400, and the suction port 131 to the suction chamber 132 The crank chamber 121 and the channel 135 are connected to each other by a passage 136 and the pressure of the crank chamber 121 is set between the crank chamber 121 and the channel 135 The pressure reducing means 600 for reducing the pressure can be further provided. However, the shape of the spring seating surface 515 of the case 510 is different.

That is, in the suction check valve applied to the swash plate type compressor according to the second embodiment of the present invention, the opening / closing core 520 is brought into close contact with one side of the case 510 to operate, A step portion 515a is formed on the spring seating surface 515 of the case 510 as shown in Fig.

When the stepped portion 515a is formed on the spring seating surface 515 of the case 510 as described above, the lower end of the spring S contacts the spring seating surface 515 at an angle. At this time, 530, the unbalance is generated in the repulsive force of the spring S that elastically supports the opening / closing core 520. As shown in FIG. Accordingly, the opening / closing core 520 is inclined in the direction of the arrow B so that a certain portion of the side surface of the opening / closing core 520 is in close contact with the inner peripheral surface of the case 510.

When the opening and closing core 520 is reciprocally moved inside the case 510 while a certain portion of the side surface of the opening and closing core 520 is kept in close contact with the inner circumferential surface of the case 510, Even when there is a gap between the inner circumferential surfaces of the case 510, the oscillation noise can be prevented when the opening / closing core 520 reciprocates.

Hereinafter, a swash plate type compressor according to a third embodiment of the present invention will be described with reference to FIG. 9 and partially with reference to FIGS. 3 to 5 described above.

The swash plate type compressor according to the third embodiment of the present invention has the same overall structure as the swash plate type compressor according to the first embodiment of the present invention described above. That is, the housing 100 is installed on the piping 135 connecting the housing 100, the rotary shaft 200, the swash plate 300, the plurality of pistons 400, and the suction port 131 to the suction chamber 132 The crank chamber 121 and the channel 135 are connected to each other by a passage 136 and the pressure of the crank chamber 121 is set between the crank chamber 121 and the channel 135 The pressure reducing means 600 for reducing the pressure can be further provided. However, the shape of the spring seating surface 522aa of the opening / closing core 520 is different.

That is, in the suction check valve applied to the swash plate type compressor according to the third embodiment of the present invention, the opening / closing core 520 is brought into close contact with one side of the case 510 to operate, The spring seating surface 522aa of the opening / closing core 520 is formed to be inclined as shown in Fig.

When the spring seating surface 522aa of the opening / closing core 520 is inclined, the upper end of the spring S contacts the spring seating surface 522aa at an angle. At this time, The degree of compression of the spring S on the left and right sides of the drawing varies, and an unbalance occurs in the repulsive force of the spring S that elastically supports the opening / closing core 520. [ Therefore, the opening / closing core 520 is inclined in the direction of the arrow C, so that a certain portion of the side surface of the opening / closing core 520 is in close contact with the inner peripheral surface of the case 510.

When the opening and closing core 520 is reciprocally moved inside the case 510 while a certain portion of the side surface of the opening and closing core 520 is kept in close contact with the inner circumferential surface of the case 510, Even when there is a gap between the inner circumferential surfaces of the case 510, the oscillation noise can be prevented when the opening / closing core 520 reciprocates.

Hereinafter, a swash plate type compressor according to a fourth embodiment of the present invention will be described with reference to FIG. 10 and partially with reference to FIGS. 3 to 5 described above.

The swash plate type compressor according to the fourth embodiment of the present invention is the same in overall construction as the swash plate type compressor according to the first embodiment of the present invention described above. That is, the housing 100 is installed on the piping 135 connecting the housing 100, the rotary shaft 200, the swash plate 300, the plurality of pistons 400, and the suction port 131 to the suction chamber 132 The crank chamber 121 and the channel 135 are connected to each other by a passage 136 and the pressure of the crank chamber 121 is set between the crank chamber 121 and the channel 135 The pressure reducing means 600 for reducing the pressure can be further provided. However, the shape of the spring seating surface 522aa of the opening / closing core 520 is different.

That is, in the case of the suction check valve applied to the swash plate type compressor according to the fourth embodiment of the present invention, the opening / closing core 520 is brought into close contact with one side of the case 510 to operate, A step portion 522aaa is formed on the spring seating surface 522aa of the opening / closing core 520 as shown in Fig.

When the stepped portion 522aaa is formed on the spring seating surface 522aa of the opening / closing core 520, the upper end of the spring S contacts the spring seating surface 522aa at an angle. At this time, The degree of compression of the left and right springs S on the left and right sides of the drawing is different from that of the spring 530 in the drawing, and an unbalance occurs in the repulsive force of the spring S that elastically supports the opening and closing core 520. Accordingly, the opening / closing core 520 is inclined in the direction of the arrow D so that a certain portion of the side surface of the opening / closing core 520 is in close contact with the inner peripheral surface of the case 510.

When the opening and closing core 520 is reciprocally moved inside the case 510 while a certain portion of the side surface of the opening and closing core 520 is kept in close contact with the inner circumferential surface of the case 510, Even when there is a gap between the inner circumferential surfaces of the case 510, the oscillation noise can be prevented when the opening / closing core 520 reciprocates.

Hereinafter, the swash plate type compressor according to the fifth embodiment through the eighth embodiment of the present invention will be described with reference to FIGS. 11 through 14, in part with FIGS. 3 through 10 described above.

The swash plate type compressor according to the fifth to eighth embodiments of the present invention are respectively the same as the swash plate type compressor according to the first to fourth embodiments of the present invention. However, in the case of the swash plate type compressor according to the fifth to eighth embodiments of the present invention, the pressure transmission rod 530 'is used instead of the pressure receiving chamber 530 in the construction of the suction check valve 500, , And the difference is mainly described.

The suction check valve 500 applied to the swash plate compressor according to the fifth to eighth embodiments of the present invention includes a case 510, an opening / closing core 520, and a pressure transmitting rod 530 '.

The pressure transmitting rod 530 'is a means for allowing the pressure of the crank chamber 121 to additionally act on the opening and closing core 520. The pressure transmitting rod 530' The pressure of the crank chamber 121 can be added to the pressure of the suction chamber 132 so as to cope with the pressure so that even if the pressure of the suction port 131 becomes excessive, ) Can be adjusted appropriately.

To this end, the pressure transmitting rod 530 'has a pressing surface 531' which receives the pressure of the crank chamber 121 so that the pressure of the crank chamber 121 can be applied to the inside of the opening / closing core 520, And is formed as a solid rod such as a circular rod which is positioned inside the opening / closing core 520 and moves up and down integrally with the opening / closing core 520 through the guide hole 514 of the case 510 do.

11 to 14, the pressure transmitting rod 530 'may be integrally formed with the opening / closing core 520, may be formed separately from the opening / closing core 520, . When the pressure transmitting rod 530 'is separately formed and coupled to the opening / closing core 520, the pressure transmitting rod 530' may be coupled in various ways. However, considering the manufacturing process and the durability of the pressure transmitting rod 530 ' And is preferably coupled to the core 520 by insert injection.

The pressure of the suction port 121 and the suction chamber 132 and the pressure of the crank chamber 121 transmitted through the pressure transmission rod 530 ' And the sectional area of the pressing surface 531 'of the pressure transmitting rod 530' is not more than 30% of the sectional area of the outer surface 522b of the pressure acting plate 522 . This is because the pressure of the crank chamber 121 becomes larger than the pressure of the suction port 121 when the variable operation is performed so that the opening and closing core 520 is raised to the top dead center to prevent the inlet port 511 of the case 510 from being closed .

When the pressure reducing means 600 is installed between the crank chamber 121 and the conduit 135, the cross sectional area of the pressure applying surface 531 'of the pressure transmitting rod 530' Sectional area greater than 30% of the cross-sectional area of the outer side surface 522b of the second side wall 522b.

Hereinafter, the operation of the swash plate type compressor according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the second to eighth embodiments of the present invention shown in FIGS. 8 to 14 Operation of the swash plate type compressor is the same as that of the first embodiment, and a description thereof will be omitted.

The swash plate compressor according to the first embodiment of the present invention is configured to vary the opening degree of the suction check valve 500 according to the flow rate of the refrigerant flowing from the external refrigerant line through the suction port 131, And as shown in FIG. 4, the role of the suction check valve 500 becomes more important in the case of the variable displacement swash plate type compressor in which the inclination of the swash plate 300 can be varied.

3, when the inclination of the swash plate 300 is the maximum, the stroke of each piston 400 becomes the maximum, and therefore the amount of the refrigerant flowing from the outside through the suction port 131 becomes maximum do. Accordingly, the opening / closing core 520, which has closed the suction port 511 of the suction check valve 500, reaches the bottom dead center while compressing the spring S to the maximum. When the opening / closing core 520 reaches the bottom dead point, the suction port 511 of the suction check valve 500 as well as the discharge port 512 are also adjusted to the maximum opening degree M so that the refrigerant at the maximum flow rate is sucked into the suction chamber 132 ).

Conversely, when the inclination of the swash plate 300 becomes 90 deg. As shown in Fig. 4, the reciprocation of each piston 400 disappears and the piston bores 111 remain stationary. At this time, the amount of the refrigerant flowing through the suction port 131 is minimized. In this case, as shown in FIG. 5, the opening / closing core 520 closes the suction port 511 by the reaction force of the spring S.

In the variable operation of the swash plate type compressor, the slope of the swash plate 300 varies, so that the refrigerant pressure acting on the opening / closing core 520 through the suction port 511 varies, but the suction port 511 and the suction chamber The opening / closing core 520 is lowered to the maximum, and the spring S is also compressed to the maximum, even if the differential pressure between the two is not the maximum variable. 7, the pressure of the refrigerant from the crank chamber 121 acts on the inner surface 522a of the pressure acting plate 522 of the opening / closing core 520 through the pressure receiving chamber 530 So that the opening degree of the discharge port 512 can be appropriately adjusted by raising the opening / closing core 520.

That is, even when the pressure of the suction port 131 is excessively high and the discharge port 512 can be adjusted to the maximum opening degree M by the opening / closing core 520, , The pressure of the crank chamber 121 acts in the direction opposite to the pressure direction of the suction port 131, so that the finally adjusted opening degree as shown in FIG. 7 can be reduced. As a result, It is possible to prevent the occurrence of a roar.

The opening and closing core 520 is rotated in a direction in which the opening of the discharge port 512 is adjusted by the reciprocating operation of the opening and closing core 520 as described above, A certain part of the side surfaces thereof are in close contact with the inner surface of the case 510 so that they can operate without shaking noise even if there is a gap between the side surface of the opening / closing core 520 and the inner circumferential surface of the case 510 .

According to the swash plate type compressor of the present invention, when adjusting the suction amount of the refrigerant flowing into the suction port through the suction check valve, the spring installed on the suction check valve contacts the opening / And the opening / closing core is brought into close contact with the inner surface of the case to operate, so that the occurrence of vibration noise can be prevented in operation of the opening / closing core. Further, The crank chamber pressure can be adjusted not only by the pressure difference of the crank chamber pressure but also by the crank chamber pressure.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that the invention may be variously modified and changed.

100: housing 110: cylinder block
120: front head 121: crank chamber
130: rear head 131: suction port
132: suction chamber 135: channel
136: passage 200: rotating shaft
300: swash plate 400: piston
500: Suction check valve 510: Case
511: Inlet port 512: Outlet port
515: spring seating surface 515a:
520: opening / closing core 522aa: spring bearing surface
522aaa: stepped portion 530: pressure receiving chamber
530 ': pressure transmitting rod 531': pressing surface

Claims (9)

A cylinder block 110 having a plurality of cylinder bores 111 formed therein and a front head 120 disposed in front of the cylinder block 110 and formed with a crank chamber 121, And a rear head (130) having a port (131), a suction chamber (132), a discharge port and a discharge chamber (134) formed therein to form an outer body;
A rotating shaft 200 rotatably mounted through one side of the housing 100;
A swash plate 300 mounted on the rotary shaft 200 and integrally rotated with the rotary shaft 200 so as to be able to vary the angle with respect to the rotary shaft 200 so that the refrigerant discharge amount can be adjusted;
And is linearly reciprocated along the inner circumferential surface of the cylinder bore 111 by the rotation of the swash plate 300 so as to be reciprocated relative to the edge of the swash plate 300, A plurality of pistons (400) for compressing the refrigerant and discharging the compressed refrigerant to the discharge chamber (134); And
The suction port 511 is provided on a conduit 135 connecting the suction port 131 to the suction chamber 132. The suction port 511 penetrates through one side of the suction port 131 and communicates with the suction port 511 when the suction port 511 is opened. A case 510 in which a discharge port 512 for discharging the refrigerant from the suction port 511 to the discharge port 512 is connected to the discharge port 512; And at least one of the spring seating surfaces 515 and 522a formed in the case 510 or the opening and closing core 520 is formed so that the spring S can be slantedly contacted And a suction check valve (500)
The opening / closing core 520 is operated in an inclined state so that a part of the opening / closing core 520 reciprocates while closely contacting the inner circumferential surface of the case 510,
The suction check valve 500 further includes a passage connecting the crank chamber and the channel so that the opening degree of the suction check valve 500 can be adjusted by a differential pressure between the suction port and the suction chamber and the crank chamber, The suction check valve 500 is disposed at the other side of the case 510 so that the pressure of the crank chamber 121 can be applied to the inside of the opening / closing core 520, Receiving chamber 530 which is positioned inside the crank chamber 121 and accommodates the pressure of the crank chamber 121 and moves up and down integrally with the opening / closing core 520 through the guide hole 514 of the case 510 Further comprising: a compressor for compressing the refrigerant. The method according to claim 1,
Wherein the spring seating surface (515) formed in the case (510) is formed to be inclined so that the spring (S) can be tilted. The method according to claim 1,
Wherein a stepped portion (515a) is formed on the spring seating surface (515) formed in the case (510) so that the spring (S) can be slantedly contacted. The method according to claim 1,
Wherein the spring seating surface (522aa) formed on the opening / closing core (520) is formed to be inclined so that the spring (S) can be slantedly contacted. The method according to claim 1,
Wherein a stepped portion (522aaa) is formed on a spring seating surface (522aa) formed in the opening / closing core (520) so that the spring (S) can be slantedly contacted. delete The method according to claim 1,
The case 510 is formed as a hollow cylindrical body having the suction port 511 and the discharge port 512 penetrating through one end surface in the axial direction and one side in the transverse direction and the guide hole 514 passing through the other axial end surface of the case 510 , The opening and closing core 520 is formed as a hollow cylinder which moves up and down in the axial direction along the inner circumferential surface of the case 510 and opens downward. The pressure receiving chamber 530 is formed along the guide hole 514 And a hollow cylindrical body that moves up and down. A cylinder block 110 having a plurality of cylinder bores 111 formed therein and a front head 120 disposed in front of the cylinder block 110 and formed with a crank chamber 121, And a rear head (130) having a port (131), a suction chamber (132), a discharge port and a discharge chamber (134) formed therein to form an outer body;
A rotating shaft 200 rotatably mounted through one side of the housing 100;
A swash plate 300 mounted on the rotary shaft 200 and integrally rotated with the rotary shaft 200 so as to be able to vary the angle with respect to the rotary shaft 200 so that the refrigerant discharge amount can be adjusted;
And is linearly reciprocated along the inner circumferential surface of the cylinder bore 111 by the rotation of the swash plate 300 so as to be reciprocated relative to the edge of the swash plate 300, A plurality of pistons (400) for compressing the refrigerant and discharging the compressed refrigerant to the discharge chamber (134); And
The suction port 511 is provided on a conduit 135 connecting the suction port 131 to the suction chamber 132. The suction port 511 penetrates through one side of the suction port 131 and communicates with the suction port 511 when the suction port 511 is opened. A case 510 in which a discharge port 512 for discharging the refrigerant from the suction port 511 to the discharge port 512 is connected to the discharge port 512; And at least one of the spring seating surfaces 515 and 522a formed in the case 510 or the opening and closing core 520 is formed so that the spring S can be slantedly contacted And a suction check valve (500)
The opening / closing core 520 is operated in an inclined state so that a part of the opening / closing core 520 reciprocates while closely contacting the inner circumferential surface of the case 510,
The suction check valve 500 further includes a passage connecting the crank chamber and the channel so that the opening degree of the suction check valve 500 can be adjusted by a differential pressure between the suction port and the suction chamber and the crank chamber, The suction check valve 500 is disposed at the other side of the case 510 so that the pressure of the crank chamber 121 can be applied to the inside of the opening / closing core 520, A pressure transmitting rod 530 'which is positioned inside the crank chamber 121 and accommodates the pressure of the crank chamber 121 and moves up and down integrally with the opening / closing core 520 through the guide hole 514 of the case 510, Further comprising: a compressor for compressing the refrigerant. The method of claim 8,
The case 510 is formed as a hollow cylindrical body having the suction port 511 and the discharge port 512 penetrating through one end surface in the axial direction and one side in the transverse direction and the guide hole 514 passing through the other axial end surface of the case 510 , The opening and closing core 520 is formed as a hollow cylindrical body which moves up and down in the axial direction along the inner circumferential surface of the case 510 and the lower side is opened, , And a pressure surface (531 ') for receiving the pressure of the crank chamber (121) is formed at an end thereof.

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