KR101882673B1 - Swash plate type compressor - Google Patents

Abstract

The present invention relates to a swash plate type compressor, and more particularly, to a suction check valve (500) capable of effectively reducing pulsation of high frequency components generated during operation of an opening / closing core (520) Is installed. Such a swash plate type compressor has a pressure control valve chamber 540 in which the volume of the swash plate type compressor can be changed under the suction check valve 500 and the pressure of the crank chamber 121 is applied to effectively reduce pulsation of high frequency components By applying a fixing structure for restricting the end position of the spring S to the spring seating surface 522aa so that the spring S supporting the opening / closing core 520 can be positioned at an angle, The occurrence of noise can be prevented.

Description

[0001] SWASH PLATE TYPE COMPRESSOR [0002]

The present invention relates to a swash plate type compressor, and more particularly, to a swash plate type compressor in which 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 effectively reducing the occurrence of vibration noise when operating the opening and closing cores.

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 is installed on the pipe 135 connecting the suction port (not shown) to the suction chamber 132 and is provided between the suction port 132 and the crank chamber 121 So that the opening degree can be controlled. At this time, a passage 136 connecting the crank chamber 121 and the conduit 135 is formed.

On the other hand, the above-described improved suction check valve 250 has a suction port 251a at one side thereof and a discharge port 251b communicating with the suction port 251a when the suction port 251a is opened, A case 251 having a guide hole 251d formed at one side thereof and a case 251 supported by the inside of the case 251 via a spring S so as to extend from the suction port 251a to the discharge port 251b An opening and closing core 252 for adjusting the flow of the refrigerant and a crank chamber 121 located 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 that receives the pressure of the pressure chamber 251 and moves up and down integrally with the opening and closing core 252 through the guide hole 251d of the case 251. [

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, the suction pulsation or the noise that was a problem in the variable operation can be significantly reduced, but the suction pulsation of the high frequency component is still not reduced. In addition, there is a problem that the operation of the opening / closing core 252 generates noise due to the gap between the side face of the opening / closing core 252 and the inner side face of the case 251.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a pressure control valve chamber in which a pulsation of high frequency components can be effectively reduced, It is an object of the present invention to provide a swash plate type compressor in which the opening and closing cores are brought into close contact with the inner side surface of the case by applying a fixing structure for restricting the end position of the spring to the seating surface, .

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 plurality of pistons to be discharged and a differential pressure between the suction port and the suction chamber and between the suction chamber and the crank chamber, the piston being provided on a pipe connecting the suction port to the suction chamber, the opening degree being adjusted by a differential pressure between the suction port and the suction chamber, Wherein the suction check valve has a suction port at one side thereof and a discharge port communicating with the suction port at the time when the suction port is opened is passed through the other side of the suction check valve, A case having a hole formed therein, an opening / closing core supported by a spring on the inside of the case to adjust the flow of the refrigerant leading from the inlet to the outlet, A pressure receiving chamber which moves up and down integrally with the opening / closing core, and a pressure receiving chamber which communicates with the crank chamber And a pressure regulating valve chamber formed between the pressure receiving chamber and the pressure receiving chamber so as to be capable of varying in volume between the pressure receiving chamber and the pressure receiving chamber, A partition plate extending to the inner surface of the passage, an inner surface of the passage, and an outer lower end surface of the case.

Preferably, the passage is formed to communicate with the crank chamber, and the opening degree of the suction check valve is adjusted by a differential pressure between the suction port and the suction chamber and the crank chamber.

Preferably, the passage is formed so as not to communicate with the crank chamber, and the opening degree of the suction check valve is adjusted by a differential pressure between the suction port and the suction chamber.

The partition plate may have a communication hole communicating the pressure regulating valve chamber and the passage so that the pressure of the crank chamber may act on the pressure regulating valve chamber.

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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.

The case and the opening and closing core are each provided with a spring seating surface and the spring seating surface formed on the opening and closing core is provided with a spring top position fixing hook for guiding one side of the spring upper end to be biased toward the center of the spring seating surface desirable.

And a spring lower end position fixing protrusion is formed on the spring seating surface formed in the case to guide the lower end of the spring to be seated at the center of the spring seating surface.

And the inclined surface for guiding the lower end of the spring to be smoothly seated on the spring seating surface formed on the case is formed on the spring lower end position fixing projection.

According to the swash plate type compressor as described above, by forming the pressure control valve chamber at the lower end portion of the suction check valve, the pulsation of the high frequency component can be effectively reduced, and the spring The opening / closing core is brought into close contact with the inner surface of the case to operate, so that the occurrence of the noise of the opening / closing operation can be prevented.

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 an 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 type compressor according to an embodiment of the present invention, in which the suction port of the suction check valve is opened to the maximum.
FIG. 7 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, in which the suction port of the suction check valve is properly opened; FIG.
FIG. 8 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to another embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.
9 is a longitudinal sectional view of a suction check valve applied to a swash plate compressor according to another embodiment of the present invention, showing a state in which the suction port of the suction check valve is opened to the maximum.
10 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to another embodiment of the present invention, in which the suction port of the suction check valve is properly opened.

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, FIG. 5 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, in which the suction port of the suction check valve is closed, FIG. 6 is a cross- FIG. 7 is a cross-sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, Fig. 5 is a longitudinal sectional view of the suction check valve, showing a state in which the suction port of the suction check valve is properly opened. Fig.

3 to 7, a swash plate compressor according to an embodiment of the present invention will be described. The swash plate compressor according to an 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.

3 and 4, the housing 100 includes a cylinder block 110, a front head 120, and a rear head 130. As shown in FIGS. 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, a pressure receiving chamber 530, and a pressure regulating valve chamber 540, 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, one end of the case 510 is connected to a pipe (not shown) for connecting the suction port 131 to the suction chamber 132 135 and the other side is provided on a passage 136 connecting the crank chamber 121 and the pipeline 135. At this time, an O-ring (R) is provided between the case (510) and the passageway (136) 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 cover 513 and forms a flow path continuously with the suction port 131. Therefore, when the suction port 511 is opened, the external refrigerant introduced 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.

5 to 7, the opening / closing core 520 includes a case 510 and a case 510. The opening / closing core 520 is a hollow cylindrical body such as a cylindrical body that reciprocates vertically inside the case 510 and opens downward. And is reciprocally moved between the top dead center constrained by the lid 513 of the case 510 and the bottom dead center where 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 is formed with a space portion 530a therein so that the pressure of the crank chamber 121 can be applied to 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 516 on which 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, it is necessary to prevent the generation of noise when the open / close core 520 is operated by bringing the open / close core 520 into close contact with one side of the case 510 to operate. To this end, a spring top position fixing stopper 522aaa for guiding the upper end of the spring S to be biased toward the center of the spring seating surface 522aa is formed on the spring seating surface 522aa formed on the opening / closing core 520, And a spring lower surface position fixing protrusion 516a for guiding the lower end of the spring S to be seated at the center of the spring seating surface 516 is formed on the spring seating surface 516 formed in the case 510 . The spring lower end position fixing protrusion 516a may be formed with an inclined surface 516aa for guiding the lower end of the spring S to be smoothly seated on the spring seating surface 516 formed in the case 510 .

The spring upper end position fixing hook 522aaa is formed on the spring seating face 522aa formed on the opening and closing core 520 and the spring lower face fixing projection 516 formed on the case 510 The spring S supports the opening and closing core 520 in an inclined position with respect to the opening and closing core 520 and the case 510 as shown in FIGS. As a result, the degree of compression of the left and right springs S varies depending on the pressure receiving chamber 530, and an unbalance occurs in the repulsive force of the spring S that elastically supports the opening / closing core 520. The opening / closing core 520 is inclined in an oblique direction of the spring S, and a certain portion of the side surface of the opening / closing core 520 is in close contact with the inner circumferential 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 control valve chamber 540 includes a passage 136 connecting the crank chamber 121 and the conduit 135 and a pressure chamber 530 formed between the pressure receiving chamber 530 and the pressure control valve chamber 540, The pressure regulating valve chamber 540 is formed to extend from the lower end of the pressure receiving chamber 530 to the inner surface 136a of the passage 136 as shown in Figures 5-7 Is formed by the partition plate 541, the inner surface 136a of the passage 136 and the outer lower end surface 515 of the case 510. [

Here, the partition plate 541 has a shape corresponding to a cross-sectional shape of the passage 136. For example, when the sectional shape of the passage 136 is circular, the partition plate 541 is formed in a substantially disc shape.

The partition plate 541 is slidably moved along the inner surface 136a of the passage 136 so that the contact area of the passage 136 with respect to the passage 136 can be increased for stable sliding movement, It is preferable that it is formed in a bent shape as shown in Fig.

A communication hole 541a for communicating the pressure regulating valve chamber 540 with the passage 136 is formed in the partition plate 541 so that the pressure of the crank chamber 121 can act on the pressure regulating valve chamber 540. [ Is formed.

By forming the pressure regulating valve chamber 540 as described above and forming the communication hole 541a communicating the pressure regulating valve chamber 540 and the passage 136, the opening / closing core 520, The pressure of the crank chamber 121 can act on the pressure control valve chamber 540 through the communication hole 541a when the partition plate 530 and the partition plate 541 move up and down integrally, When the pressure in the crank chamber 121 acts on the valve chamber 540, the same effect as that in which the resistance force acts in the opposite direction with respect to the upward movement or downward movement of the opening / closing core 520 can be obtained, The pulsation of the high-frequency component generated in the operation of the opening / closing core 520 can be mitigated.

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

The swash plate type compressor according to the 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, 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 adjusted to the maximum opening degree so that the refrigerant at the maximum flow rate is delivered to the suction chamber 132 do.

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 excessive and the discharge port 512 can be adjusted to the maximum opening degree by the opening / closing core 520 in a state where the suction port 131 is not the maximum variable, The pressure in the crank chamber 121 acts in the direction opposite to the pressure direction of the port 131 so that the final regulated opening degree as shown in Fig. 7 can be reduced, thereby preventing the occurrence of suction pulsations or roar do.

When the opening and closing core 520 of the suction check valve 500 and the pressure receiving chamber 530 and the partition plate 541 are moved up and down integrally in the process of operating the suction check valve 500 as described above, The pressure of the crank chamber 121 acts on the pressure regulating valve chamber 540 through the communication hole 541a formed in the opening / closing core 520 and the pressure regulating valve chamber 540, The pressure in the valve chamber 540 acts as a resistance force in the opposite direction so that the pulsation of the high frequency component in the suction pulsation can be mitigated.

Since the spring S supporting the opening / closing core 520 is always inclined in an oblique direction during the operation of the suction check valve 500 as described above, a certain portion of the side surface of the opening / And is reciprocally moved inside the case 510 in a state of being closely contacted with the inner circumferential surface of the case 510. Therefore, even when there is a gap between the side surface of the opening / closing core 520 and the inner circumferential surface of the case 510, it is possible to prevent vibration noise when the opening / closing core 520 reciprocates.

Hereinafter, a swash plate compressor according to another embodiment of the present invention will be described.

FIG. 8 is a longitudinal sectional view of a suction check valve applied to a swash plate compressor according to another embodiment of the present invention, in which the suction port of the suction check valve is closed, FIG. 9 is a cross- 10 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to another embodiment of the present invention. FIG. 10 is a longitudinal sectional view of a suction check valve applied to a compressor of the present invention, , And the suction port of the suction check valve is properly opened.

Referring to FIGS. 8 to 10, a swash plate compressor according to another embodiment of the present invention will be described with reference to FIGS. 3 and 4 described above. The swash plate type compressor according to another embodiment of the present invention is the same in overall construction as the swash plate type compressor according to the embodiment of the present invention described above. The suction check valve 500 includes a housing 100, a rotary shaft 200, a swash plate 300, a plurality of pistons 400, and a suction check valve 500, A pressure control valve chamber 540 is formed which can effectively reduce the pressure of the spring 520. A fixing structure for restricting the end position of the spring on the spring seating surface is applied Are the same.

In the case of the above-described embodiment of the present invention, the passage 136 is formed to communicate with the crank chamber 121, and the suction check valve 500 is connected to the suction port 131, the suction chamber 132, The passage 136 is formed so as not to communicate with the crank chamber 121 as shown in Figs. 8 to 10 in the case of another embodiment of the present invention, The check valve 500 controls the opening degree by the differential pressure between the suction port 131 and the suction chamber 132. In this respect, there is a difference in the embodiment of the present invention described above.

According to another embodiment of the present invention, the pressure of the crank chamber 121 does not reach the passage 136, and the pressure of the crank chamber 121 does not act on the pressure control valve chamber 540. However, in another embodiment of the present invention, the passage 136 is in communication with the suction chamber 132 through a clearance between the pressure receiving chamber 530 and the case 510, A small amount of pressure is applied.

The pressure of the passage 136 also affects the pressure of the pressure regulating valve chamber 540 through the communication hole 541a formed in the partition plate 541. [

Therefore, even in the case of another embodiment of the present invention, when the opening / closing core 520 and the pressure receiving chamber 530 and the partition plate 541 are moved upward and downward integrally in operation of the opening / closing core 520, The pressure of the passage 136 acts on the pressure regulating valve chamber 540 so that when the pressure of the passage 136 acts on the pressure regulating valve chamber 540, It is possible to obtain the same effect as a resistance force acting in the opposite direction with respect to the direction movement and to mitigate the pulsation of the high frequency component generated during operation of the opening / closing core 520.

According to the swash plate type compressor of the present invention, by forming the pressure control valve chamber at the lower end of the suction check valve, the pulsation of the high frequency component can be effectively reduced, and the spring is brought into contact with the opening / The opening / closing core is brought into close contact with the inner side surface of the case by applying a fixing structure for restricting the end position of the spring to the spring seating surface, thereby preventing the generation of shaking noise during operation of the opening / closing core.

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
516: Spring bearing surface 516a: Spring lower end position fixing projection
516aa: inclined surface 520: opening / closing core
522aa: a spring seat surface 522aaa: a spring stopper for fixing the spring upper position
530: Pressure receiving chamber 540: Pressure regulating valve chamber

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 opening degree of the suction port 131 is adjusted on the basis of the differential pressure between the suction port 131 and the suction chamber 132, or the suction port 132 is provided on the pipe 135 connecting the suction port 131 to the suction chamber 132, 131), and a suction check valve (500) whose opening degree is adjusted by a differential pressure between the suction chamber (132) and the crank chamber (121)
The suction check valve 500 has a suction port 511 at one side and a discharge port 512 communicating with the suction port 511 when the suction port 511 is opened is passed through the other side, A case 510 having a guide hole 514 formed therein;
An opening and closing core 520 which is supported on the inside of the case 510 via a spring S and regulates the flow of refrigerant from the inlet 511 to the outlet 512;
A pressure receiving chamber 530 located inside the opening / closing core 520 and moving up and down integrally with the opening / closing core 520 through the guide hole 514 of the case 510;
A passage 136 formed to extend in the direction of the crank chamber 121 in communication with the conduit 135 and a pressure regulating member 136 capable of varying the volume between the pressure accommodating chambers 530 to relieve pulsation of high- And a valve chamber (540)
The pressure regulating valve chamber 540 includes a partition plate 541 extending from the lower end of the pressure receiving chamber 530 to an inner surface 136a of the passage 136 and an inner surface 136a of the passage 136, And an outer lower end surface (515) of the case (510). The method according to claim 1,
The passage 136 is formed to communicate with the crank chamber 121 and the suction check valve 500 is connected to the crank chamber 121 by the pressure difference between the suction port 131 and the suction chamber 132 and the crank chamber 121 And the opening degree of the compressor is adjusted. The method according to claim 1,
The passage 136 is formed so as not to communicate with the crank chamber 121 and the suction check valve 500 is controlled by the differential pressure between the suction port 131 and the suction chamber 132 Characterized by a swash plate compressor. delete The method according to claim 1,
The partition plate 541 is provided with a communication hole 541a communicating the pressure control valve chamber 540 and the passage 136 so that the pressure of the crank chamber 121 may act on the pressure control valve chamber 540, Is formed on the outer circumferential surface of the swash plate compressor. The method of claim 5,
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. The method of claim 6,
Spring seating surfaces 516 and 522aa are formed on the case 510 and the opening and closing core 520. One end of the spring S is seated on the spring seating surface 522aa formed on the opening and closing core 520, (522aaa) for fixing the upper end of the spring to be biased toward the center of the surface (522aa) of the swash plate type compressor. The method of claim 7,
A spring lower end position fixing protrusion 516a for guiding the lower end of the spring S to be seated at the center of the spring seating surface 516 is formed on the spring seating surface 516 formed in the case 510 Lt; / RTI > The method of claim 8,
Wherein the spring lower end position fixing protrusion 516a is formed with an inclined surface 516aa for guiding the lower end of the spring S to be smoothly seated on the spring seating surface 516 formed in the case 510. [ Expression compressor.

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