KR101915968B1 - Swash plate type compressor - Google Patents

Abstract

The present invention relates to a swash plate type compressor, in which the opening degree can be adjusted by differential pressure between a suction port (131) and a crank chamber (121), and a suction port And a suction check valve (500) capable of adjusting the opening degree is provided. The swash plate type compressor is installed in the case (not shown) so that the pressure of the crank chamber 121 can be transmitted to the inside of the opening / closing core 520 so that the opening degree can be controlled by the differential pressure between the suction port 131 and the crank chamber 121. A communication hole 514 communicating with the crank chamber 121 is formed under the first and second spring members 510 and 510. The opening and closing core 520 is configured to be elastically supported in both directions by the first spring S1 and the second spring S2 , It is possible to prevent the suction pulsation or the roar that may occur in the variable operation.

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 which compresses a refrigerant sucked from an external refrigerant line by a plurality of reciprocating pistons in accordance with rotation of a swash plate, And the opening degree of the suction check valve mounted between the chambers can be appropriately adjusted according to the amount of refrigerant sucked from the refrigerant line.

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 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.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above problems and it is an object of the present invention to provide an air conditioner in which the opening of a suction check valve is adjusted by a differential pressure between a suction port and a crank chamber And the suction port of the suction check valve gradually closes as the pressure of the crank chamber increases so as to prevent the generation of suction pulsation or noise.

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, And a suction check valve provided on a pipeline connecting the suction port to the suction chamber and whose opening degree is adjusted by a differential pressure between the suction port and the crank chamber, and a passage connecting the crank chamber and the channel Is formed.

The suction check valve is provided with a lid on one side thereof. A suction port, which continuously forms a flow path, passes through the center of the lid, and a discharge port communicating with the suction port when the suction port is opened is passed through And a communication hole communicating with the crank chamber is formed on the other side of the case. The case is supported by a lower end of the case through a first spring, and is supported on the upper end of the case through a second spring, And an opening / closing core for regulating the flow of the refrigerant leading to the discharge port.

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 respectively pass and the other end surface in the axial direction through the communication hole, And is formed as a hollow cylinder whose lower side is opened.

It is preferable that an anti-shake groove 522 is formed on the outer periphery of the opening / closing core 520, the opening / closing core 520 having a length in a direction in which the opening / closing core 520 moves up and down along the inner peripheral surface of the case 510.

And the second spring has a shape in which the diameter gradually decreases toward the opening / closing core.

Preferably, a decompression means is provided between the crank chamber and the pipeline for reducing the pressure of the crank chamber applied to the opening / closing core.

According to the swash plate type compressor as described above, in adjusting the suction amount of the refrigerant flowing into the suction port through the suction check valve, the opening degree of the suction check valve can be adjusted by the differential pressure between the suction port and the crank chamber, The suction port of the suction check valve gradually closes as the pressure of the suction check valve becomes higher, thereby preventing the occurrence of suction pulsation or noise.

1 is a perspective view showing a suction check valve employed in a conventional swash plate type compressor.
FIG. 2 is a longitudinal sectional view of a swash plate type compressor according to an embodiment of the present invention, showing a swash plate inclined with respect to a rotation axis; FIG.
3 is a longitudinal sectional view of a swash plate type compressor according to an embodiment of the present invention, showing a swash plate erected in the radial direction of the rotating shaft.
FIG. 4 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, showing a suction port of a suction check valve properly opened. FIG.
FIG. 5 is a vertical sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, showing a state in which the suction port of the suction check valve is opened to the maximum.
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, showing a state in which the suction port of the suction check valve is largely closed in accordance with an increase in pressure in the crank chamber.

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 the functions of 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. 2 is a longitudinal sectional view of a swash plate type compressor according to an embodiment of the present invention, showing a swash plate inclined with respect to a rotation axis, FIG. 3 is a longitudinal sectional view of a swash plate type compressor according to an embodiment of the present invention, FIG. 4 is a vertical cross-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 And FIG. 5 is a vertical cross-sectional view of a suction check valve applied to the swash plate type compressor according to the embodiment of the present invention, in which the suction port of the suction check valve is opened to the maximum, 1 is a longitudinal sectional view of a suction check valve applied to a compressor of the present invention, showing a state in which a suction port of a suction check valve is substantially closed in accordance with an increase in pressure in a crank chamber.

2 through 6, the swash plate compressor according to the embodiment of the present invention includes a housing 100, a rotary shaft 200, a swash plate 300, and a plurality of pistons 400.

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. 2 and 3, 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.

As shown in FIGS. 2 and 3, 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 the center 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.

2, 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 rotary 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.

2 and 3 are variable displacement swash plate type compressors. The swash plate type compressor is installed such that the inclination angle of the swash plate 300 varies, and the swash plate 300 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. 2, the piston 400 reciprocates in the cylinder bore 410 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 410 by the swash plate 300 and as shown in Figures 2 and 3, 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 and an opening / closing core 520, as shown in FIG. The intake check valve 500 is opened by the differential pressure between the suction port 131 and the crank chamber 121. When the pressure of the crank chamber 121 is increased during the variable operation, So that the suction port 511 gradually closes, thereby preventing the occurrence of suction pulsation or noise.

The crank chamber 121 and the channel 135 are connected to each other by a passage 136 so that the pressure of the crank chamber 121 can act on the opening and closing core 520, A communication hole 514 communicating with the crank chamber 121 is formed.

4 to 6, the case 510 includes a channel 135 for 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 has a shape that is closed except for the communication hole 514, And a suction port 511 which continuously forms a flow path with the suction port 131 is passed through the center of the lid 513. 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 case 510 is reciprocated in the axial direction in accordance with the differential pressure between 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 crank chamber 121, The opening of the suction port 511 and the discharge port 512 are 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. A vibration preventing groove 522 having a length in a direction in which the opening and closing core 520 moves up and down along the inner circumferential surface of the case 510 is formed on the outer periphery of the opening and closing core 520, 522 can prevent the opening / closing core 520 from vibrating when vertically moving.

On the other hand, the opening / closing core 520 is vertically reciprocated within the case 510 The first spring S1 inserted into the lower end of the case 510 and the second spring S1 inserted into the upper end of the case 510, as shown in Figs. 4 and 5, Is supported by a second spring (S2) and reciprocating between a top dead center at which compression of the second spring (S2) is no longer possible and a bottom dead center at which compression of the first spring (S1) do. The opening and closing core 520 is vertically reciprocated within the case 510. The pressure of the crank chamber 121 directly acts on the lower end of the opening and closing core 520, It is more preferable that the outer circumference of the case 510 is formed to be spaced apart from the inner circumference of the case 510 by a predetermined distance.

The first spring S1 is resilient repulsion means for supporting the opening and closing core 520 from below as described above and is provided between the bottom of the inner space of the case 510 and 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 port 511. The second spring S2 is an elastic resilient means for supporting the opening and closing core 520 from above and is disposed between the lid 513 of the case 510 and the opening and closing core 520 to open and close the opening and closing core 520 And serves to repel the opening / closing core 520 against the pressure of the refrigerant applied to the lower end of the opening / closing core 520 from the crank chamber 121.

4, when the sum of the elastic forces of the first spring S1 and the second spring S2 is zero, the pressure of the refrigerant flowing through the suction port 511 is zero, When the pressure of the refrigerant acting through the suction port 511 is the maximum and the pressure of the crank chamber 121 is not large, as shown in FIG. 5, (S1) is compressed as much as possible toward the bottom of the case (510) so that the discharge port (512) can be opened by the opening / closing core (520) as much as possible. In addition, when the pressure of the crank chamber 121 gradually increases at the time of variable operation, the opening / closing core 520 gradually rises. At this time, the inlet port 511 is substantially closed as shown in FIG. 6, 2 Spring S2 is compressed to the maximum.

It is preferable that the second spring S2 has such a shape that its diameter gradually decreases toward the opening and closing core 520. This is because when the pressure of the crank chamber 121 rises, The initial compression of the second spring S2 is smoothly performed and the compression resistance of the second spring S2 is gradually increased as the opening and closing core 520 is raised. So that the opening and closing core 520 can be smoothly moved up and down.

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.

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

The swash plate 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, 3, the function 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.

2, when the inclination of the swash plate 300 is the maximum, the stroke of each piston 400 becomes the maximum, so that the amount of the refrigerant flowing from the outside through the suction port 131 is maximized 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 first spring S1 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 is 90 DEG as shown in Fig. 3, the reciprocation of each piston 400 disappears and the piston bore 111 remains stationary. At this time, the amount of the refrigerant flowing through the suction port 131 is minimized. In this case, as shown in FIG. 3, the opening / closing core 520 is rotated by the elastic force of the first spring S1 and the second spring S2, Is located at an appropriate place.

As the inclination of the swash plate 300 varies during variable operation of the swash plate type compressor, the refrigerant pressure acting on the opening / closing core 520 through the suction port 511 changes, but the pressure of the refrigerant flowing through the suction port 511 When the boring between the pressure of the suction port 131 and the pressure of the crank chamber 121 becomes equal to or more than a certain limit, the opening / closing core 520 is fully lowered, ) Is also compressed to the maximum. However, in this case, as the pressure of the refrigerant applied to the lower end of the opening / closing core 520 from the crank chamber 121 gradually rises, the opening / closing core 520 also gradually rises so that the opening of the discharging opening 512 is appropriately adjusted .

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 of the crank chamber 121 acts in a direction opposite to the pressure direction of the port 131 so that the opening of the discharge port 512 can be appropriately adjusted so that the generation of suction pulsation or noise .

According to the swash plate type compressor according to the above-described embodiment of the present invention, when the suction amount of refrigerant flowing into the suction port is adjusted through the suction check valve, the opening degree of the suction check valve is adjusted by the differential pressure between the suction port and the crank chamber The suction port of the suction check valve is gradually closed as the pressure of the crank chamber is increased, so that the occurrence of suction pulsation or noise can be prevented.

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
514: communication hole 520: opening / closing core

Claims (6)

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
A suction check valve 500 installed on a pipeline 135 connecting the suction port 131 to the suction chamber 132 and adjusted in opening by a differential pressure between the suction port 131 and the crank chamber 121, And a passage 136 connecting the crank chamber 121 and the conduit 135 is formed,
The suction check valve (500)
And a lid 513 is attached to one side of the lid 513. A suction port 511 is formed at the center of the lid 513 to form a continuous flow path with the suction port 131. When the suction port 511 is opened, A case 510 having a discharge port 512 communicating with the crank chamber 511 and communicating with the crank chamber 121 at the other side thereof; And
Is supported at the lower end of the case 510 through a first spring S1 and is supported at the upper end of the case 510 via a second spring S2 so that the discharge port 512 And an opening / closing core (520) for regulating the flow of the refrigerant to the cooling /
An axial groove 521 is formed on an outer circumferential surface of the opening and closing core 520 so that the refrigerant can flow through the axial groove 521 even when the opening and closing core 520 is in close contact with the lid 513 and,
Wherein the first spring (S1) has a constant diameter, and the second spring (S2) has a shape in which the diameter gradually decreases toward the opening / closing core (520). delete The method according to claim 1,
The case is formed by a hollow cylindrical body having the inlet port (511) and the outlet port (512) penetrating through one end surface in the axial direction and one side surface in the transverse direction, and the communication hole (514) passing through the other end surface in the axial direction, Wherein the core (520) is formed of 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 method of claim 3,
Wherein a swing prevention groove (522) having a length in a direction in which the opening / closing core (520) moves up and down along the inner circumferential surface of the case (510) is formed on the outer periphery of the opening / closing core (520). delete The method according to claim 1,
Wherein a depressurizing means (600) for reducing the pressure of the crank chamber (121) applied to the opening / closing core (520) is provided between the crank chamber (121) and the pipeline (135).

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