KR102112215B1 - Variable displacement swash plate type compressor - Google Patents

Abstract

The present invention is to install a regulator valve that is dependent on the opening and closing control according to the pressure level of the discharge chamber in the interior of the communication path that enables mutual communication between the discharge chamber and the control chamber of the compressor, and when the internal pressure of the discharge chamber is low through this While sufficient refrigerant is supplied to the interior of the control chamber through the open communication path, when the internal pressure of the discharge chamber is high, the supply amount of refrigerant flowing into the interior of the control chamber through the partially closed communication path is reduced to reduce the inside of the control chamber. Disclosed is a variable capacity swash plate type compressor capable of minimizing noise generated when the air conditioner is turned off by preventing a sudden increase in pressure.
The above-described swash plate type compressor is installed in the communication path 100, and the communication path 100 for connecting the discharge chamber 51 and the control chamber 41 to enable mutual communication, depending on the pressure of the discharge chamber 51 It is provided with a regulator valve 200 that is opened and closed adjustment, the regulator valve 200 is extended from the large diameter portion 220, and the large diameter portion 220 to minimize the flow cross-sectional area of the communication path 100, the communication A spool 210 having a small-diameter portion 240 for maximizing the flow cross-sectional area of the furnace 100 is provided, and the spool 210 has a restoring force in the direction of maximizing the flow cross-sectional area of the refrigerant inside the communication path 100. It is installed so as to be supported by the return spring 300 provided.

Description

Variable displacement swash plate type compressor {VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR}

The present invention relates to a variable-capacity swash plate type compressor, and more specifically, by installing a regulator valve that controls opening and closing according to the internal pressure of the discharge chamber in a communication path that enables mutual communication between the discharge chamber and the control chamber of the compressor. It relates to a variable capacity swash plate type compressor that can improve the noise generated when off.

In general, compressors that serve to compress refrigerant in a vehicle cooling system have been developed in various forms. The compressor can be roughly divided into a reciprocating type that performs compression while reciprocating and a revolving type that performs compression while rotating.

Here, the reciprocating compressor includes a crank type that transmits the driving force of a driving source to a plurality of pistons using a crank, a swash plate type that delivers a swash plate to a rotating shaft, and a wobble plate using a wobble plate. There are Wobble Plate Type, and there are Vane Rotary Type using vanes, and Scroll Type using orbiting scroll and fixed scroll.

In addition, the swash plate type compressor includes a fixed-capacity type having a fixed installation angle of the swash plate, and a variable-capacity type capable of changing the discharge capacity by changing the inclination angle of the swash plate.

In the case of the conventional variable displacement swash plate type compressor, when the air conditioner is turned off, the refrigerant discharged from the discharge chamber through the control valve (ECV) moves to the control room (or crankcase), and the refrigerant introduced into the control room Is moved back to the suction chamber via the orifice hole of the valve plate.

Accordingly, as the refrigerant discharged from the discharge chamber moves to the control chamber, the internal pressure of the control chamber rises rapidly, and the inclination angle of the swash plate located in the driving unit can be minimized by the pressure increase.

By the way, the high-pressure refrigerant flowing into the interior of the control chamber from the discharge chamber causes the occurrence of abnormal vibration and noise in the process of rapidly raising the internal pressure of the control chamber, and the occurrence of the abnormal vibration and noise into the vehicle interior Since it is transmitted and it results in a problem that hinders quietness, an improvement plan is required.

For example, the capacity control mechanism of the variable displacement compressor disclosed in Japanese Unexamined Patent Publication No. 2011-185138 reduces noise through on / off control of the flow path by configuring a check valve on the refrigerant flow path between the discharge chamber and the control chamber. However, in this case, a discontinuous disconnection phenomenon occurs in the flow of the refrigerant, which causes a problem that causes more frequent noise.

Capacity control mechanism for variable displacement compressor of Japanese Patent Laid-Open No. 2011-185138

Accordingly, the present invention has been devised in consideration of the above-mentioned issues, and a regulator valve that is dependent on opening and closing adjustment according to the pressure of the discharge chamber is installed inside a communication path that enables mutual communication between the discharge chamber and the control chamber of the compressor. When the internal pressure of the discharge chamber is low through this, sufficient refrigerant is supplied to the interior of the control chamber through the open communication path, whereas when the internal pressure in the discharge chamber is high, through the partially closed communication path An object of the present invention is to provide a variable capacity swash plate type compressor that minimizes noise generated when the air conditioner is turned off by reducing a supply amount of refrigerant flowing into the control room to prevent a sudden increase in the pressure inside the control room.

The present invention for achieving the above object is provided with a communication path connecting the discharge chamber and the control chamber to enable mutual communication, and a regulator valve installed in the communication path to adjust the opening and closing according to the pressure of the discharge chamber, the The regulator valve has a spool having a large diameter portion that minimizes the flow cross-sectional area of the communication path, and a small diameter portion extending from the large diameter portion and maximizing the flow cross-sectional area of the communication path, wherein the spool flows refrigerant within the communication path. It is characterized in that it is installed so as to be supported by a return spring providing a restoring force in a direction to maximize the cross-sectional area.

In the present invention, the communication path includes a communication path portion corresponding to the large diameter portion of the regulator valve, and a communication path portion corresponding to the small diameter portion of the regulator valve and installing the return spring, and the communication path of the communication path The minor diameter is characterized in that it is set larger than the large diameter of the spool.

In the present invention, the communication path forms a locking jaw in the form of a stepped surface for seating and supporting one end of the return spring between the communication path portion and the communication path portion, and the communication path is provided with an entrance of the spool. It is characterized in that to form a protruding jaw protruding toward the inner center to suppress the departure.

In the present invention, the spool of the regulator valve forms a guide projection for guiding the flow of refrigerant on the surface, and the guide projection is characterized in that it is formed in the form of a spiral projection to help the formation of a vortex in the flow field of the refrigerant.

In the present invention, the spool of the regulator valve has a wing portion protruding outward from the small diameter portion for contact with the return spring, and the wing portion protrudes outward along the axial direction of the spool, while the center of the small diameter portion It is characterized by being arranged radially with respect to.

The variable displacement swash plate type compressor according to the present invention installs a regulator valve that is dependent on opening / closing control in conjunction with the pressure of the discharge chamber in the interior of a communication path that enables mutual communication between the discharge chamber and the control chamber, thereby providing the internal pressure of the discharge chamber. When this is low, sufficient refrigerant can be supplied to the inside of the control room by using the entire area of the communication path according to the opening of the valve, so that the inclination angle of the swash plate can be freely adjusted. The supply of limited refrigerant into the interior of the control room can be made by using the open part of some areas of the entire communication path according to the partial closing of the valve, thereby preventing the pressure inside the control room from rising rapidly. It provides an effect to minimize noise generated when the air conditioner is turned off.

1 is a cross-sectional view showing the entire configuration of a variable displacement swash plate type compressor according to the present invention.
2 is a cross-sectional view partially showing a state in which a regulator valve is installed inside a communication path formed in a cylinder block to communicate between a discharge chamber and a control chamber as a main component of the present invention.
3 is an enlarged perspective view of the spool of the regulator valve shown in FIG. 2.
4 is a cross-sectional view showing an operating state of the regulator valve shown in FIG. 2.

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

When explaining the main configuration of the variable displacement swash plate type compressor prior to the detailed description of the embodiment of the present invention are as follows.

1 is a cross-sectional view showing the entire configuration of a variable displacement swash plate type compressor according to the present invention.

Referring to FIG. 1, the variable displacement swash plate type compressor 10 includes a cylinder block 20 forming an external shape and an internal compression chamber of a compressor, and a rotational shaft rotatably installed on a central portion of the shaft of the cylinder block 20 ( 30), the front housing 40 coupled to the cylinder block 20 to close the front portion of the cylinder block 20, the rear coupled to the cylinder block 20 to close the rear portion of the cylinder block 20 It is configured to include a housing 50 and a valve assembly 60 installed between the cylinder block 20 and the rear housing 50 to regulate suction and discharge of refrigerant.

The cylinder block 20 forms a center bore 21 that penetrates the member in the central portion in the axial direction, and is individually arranged such that a plurality of cylinder bores 22 are radially spaced around the center bore 21. Is formed into. That is, each of the cylinder bore 22 is formed through the cylinder block 20 in the axial direction. In addition, the piston 23 is individually installed inside the cylinder bore 22 so as to reciprocate in a linear direction. Accordingly, the refrigerant can be compressed at high pressure by the reciprocating motion of the piston 23 made inside the cylinder bore 22.

The rotating shaft 30 is rotatably installed inside the center bore 21 formed through the axial direction at the central portion of the cylinder block 20.

The front housing 40 is coupled to the front portion of the cylinder block 20 to form a control chamber 41 (also referred to as a crankcase) therein. In addition, the front housing 40 is rotatably provided with a pulley 42 that is supplied with power from an external power source (not shown) such as an engine, and the rotation shaft 30 is the pulley inside the cylinder block 20 ( It is installed to rotate in conjunction with the rotation of 42).

The rear housing 50 is coupled to the rear portion of the cylinder block 20. In addition, the interior of the rear housing 50 is provided with a discharge chamber 51 and a suction chamber 52 that are selectively communicated with the cylinder bore 22, respectively, and the discharge chamber 51 has a rear housing 50 ) Is formed in a position adjacent to the outer circumferential edge portion, and the suction chamber 52 is formed in the radially inner side of the discharge chamber 51, approximately in the central portion of the rear housing 50.

The valve assembly 60 is to be installed between the cylinder block 20 and the rear housing 50, the suction reed valve 64 and discharge for suction coupled to both sides around the valve plate 61 located in the center A reed valve 66 is provided. In addition, the valve assembly 60 is further configured to further include a gasket 65 installed at the rear of the reed valve 66 for discharge. In this case, the valve plate 61 is in communication with the cylinder bore 22 through the reed valve 64 for discharge and the intake port 63 communicating with the cylinder bore 22 through the suction reed valve 64 Each discharge port 62 is separately provided.

On the other hand, the rotor 70 is installed on one side of the rotating shaft 30, the rotor 70 is configured to rotate integrally with the rotating shaft 30 when the rotating shaft 30 is rotated. To this end, the rotating shaft 30 is installed to penetrate the central portion of the rotor 70 in the control room 41. In addition, a hinge receiving portion 71 is protruded on one side of the rotor 70.

And the swash plate 80 is installed so that the inclination angle can be adjusted to a position spaced apart from the rotor 70 on the rotating shaft 30. To this end, the swash plate 80 is formed with a hinge coupling portion 81 for hinge coupling with the hinge receiving portion 71 of the rotor 70, and the hinge receiving portion 71 and the of the rotor 70 The hinge coupling portion 81 of the swash plate 80 is hinged by a hinge pin 72 so that the swash plate 80 can rotate together when the rotor 70 is rotated. In this case, the swash plate 80 is connected to each piston 23 via a shoe 82, and by rotation of the swash plate 80, the piston 23 linearly reciprocates within the cylinder bore 22 While it is possible to compress the refrigerant.

In addition, in the variable capacity type swash plate type compressor 10, the inclination angle of the swash plate 80 with respect to the rotating shaft 30 can be variably adjusted to adjust the pressure of the refrigerant discharged. To this end, the flow path of the refrigerant in the form of communication between the discharge chamber 51 and the control chamber 41 (A; shown as a dotted arrow in FIG. 1 as corresponding to the control chamber suction path), and the control chamber 41 and the suction chamber (52) A flow path of the refrigerant in the form of communication between them (b; corresponding to the discharge path of the control room, shown by a dotted arrow in FIG. 1) is formed, respectively. In addition, a pressure control valve (not shown) for adjusting the flow of the refrigerant is installed in the control chamber suction path (A).

As a result, the inclination angle of the swash plate 80 is dependently changed by the pressure change inside the control chamber 41 accompanied by the opening and closing action of the pressure regulating control valve. That is, the inclination angle of the swash plate 80 with respect to the rotating shaft 30 may vary from a minimum angle to a maximum angle according to the pressure change of the control room 41, and the cylinder according to the inclination angle of the swash plate 80 In the bore 22, the stroke of the piston 23 is controlled dependently, so that the degree of compression of the refrigerant can be determined.

2 is a cross-sectional view partially showing a state in which a regulator valve is installed inside a communication path formed in a cylinder block to communicate between a discharge chamber and a control chamber as a main component of the present invention, and FIG. 3 is a regulator illustrated in FIG. 2 This is an enlarged perspective view of the valve spool.

2 and 3, the variable-capacity swash plate compressor according to an embodiment of the present invention corresponds to a control room suction path (a) so as to be communicatively connected to the discharge chamber 51 and the control chamber 41 To form a communication path 100. A regulator valve 200 in which opening / closing control is dependent on the pressure of the discharge chamber 51 is installed inside the communication path 100.

Here, the communication path 100 is formed by penetrating the cylinder block 20 in the axial direction, the flow path section 120 for reducing the flow cross-sectional area of the refrigerant, and the flow cross-sectional area than the communication path section 120 It forms a flow path consisting of a multi-stage structure of at least two stages having a large passage portion 140 for setting relatively large. In this case, the communication channel portion 120 is formed in a portion adjacent to the control chamber 41, and the passage portion 140 is formed in a portion adjacent to the discharge chamber 51.

In addition, the communication path 100 forms a stepped surface-shaped locking jaw 160 between the communication path portion 120 and the large passage portion 140, and an inner central portion at the entrance of the communication path 100 A protruding jaw 180 having a shape protruding toward is formed. In this case, the protruding jaw 180 may be embodied as a snap ring (not shown) that is detachably assembled to the inner circumferential surface of the entrance of the communication path 100.

On the other hand, the regulator valve 200 is a spool 210 corresponding to a plunger, and minimizes the flow cross-sectional area of the communication path 100 to flow the refrigerant flowing from the discharge chamber 51 into the control chamber 41. The diameter of the large diameter portion 220, and extending from the large diameter portion 220 to maximize the flow cross-sectional area of the communication path 100 to increase the flow rate of the refrigerant flowing from the discharge chamber 51 to the control chamber 41 A small diameter portion 240 is provided.

In this case, the spool 210 of the regulator valve 200 is installed to be supported by the return spring 300 to provide a restoring force in the direction of maximizing the flow cross-sectional area of the refrigerant in the communication path 100.

In addition, the communication channel portion 120 of the communication path 100 secures a space to correspond to the large diameter portion 220 of the regulator valve 200, and the large passage portion 140 of the communication path 100 Is corresponding to the small-diameter portion 240 of the regulator valve 200 and is configured to secure a space for installing the return spring 300. In particular, the diameter of the communication channel portion 120 of the communication path 100 is set larger than the large-diameter portion 220 of the spool 210, and configured to allow minimal refrigerant flow through the gap formed therebetween. do.

Accordingly, the locking jaw 160 of the communication path 100 is supported by seating one end of the return spring 300, the communication path 100 is located at the entrance, the protruding jaw 180 is the spool By seating and supporting one end of the 210, it is possible to suppress the departure of the regulator valve 200 from the communication path 100 from the interior of the communication path 100.

In addition, the spool 210 of the regulator valve 200 is a guide projection for smoothly guiding the flow of refrigerant flowing into the interior of the control chamber 41 from the discharge chamber 51 to all areas of the surface ( 212). In particular, it is more preferable that the guide protrusion 212 is formed in the form of a spiral protrusion to help the formation of a vortex in the flow field of the refrigerant from the discharge chamber 51 toward the interior of the control chamber 41.

In addition, the spool 210 of the regulator valve 200 is provided with a wing portion 242 protruding outward from the small diameter portion 240 for support through contact with the return spring 300, the The wing portion 242 is formed to be radially disposed with respect to the center of the small diameter portion 240 while protruding outward along the axial direction of the spool 210.

Therefore, the present invention configured as described above is in the interior of the communication path 100 according to the pressure of the refrigerant flowing from the discharge chamber 51 toward the control chamber 41 through a control valve (not shown) when the air conditioner is turned off. The opening and closing action of the installed regulator valve 200 can prevent the pressure inside the control chamber 41 from rising rapidly, thereby minimizing the noise generated.

That is, when the internal pressure of the discharge chamber 51 is low, as shown in FIG. 2, the return spring 300 presses the spool 210 of the regulator valve 200 toward the discharge chamber 51. Since the large diameter portion 220 is located at a part of the communication path 100 away from the communication path portion 120, the internal flow cross-sectional area of the communication path 100 can be secured to the maximum, and through this, The flow of refrigerant from the discharge chamber (51) to the control chamber (41) can be made smoothly.

In contrast, when the internal pressure of the discharge chamber 51 is high, as shown in FIG. 4, the spool 210 of the regulator valve 200 compresses the return spring 300 while the control chamber 41 Since the large-diameter portion 220 is moved toward and is located at a portion entering the small-diameter portion 240 of the communication path 100, the internal flow cross-sectional area of the communication path 100 is switched to a minimum state, Through this, the flow rate of the refrigerant supplied from the discharge chamber 51 to the control chamber 41 is minimized, thereby preventing the internal pressure of the control chamber 41 from rapidly increasing. As a result, the present invention can prevent the internal pressure of the control room 41 from suddenly increasing when the air conditioner is turned off, thereby minimizing the generated noise.

As described above, preferred embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited by the specific embodiments described above, and has ordinary knowledge in the technical field to which the present invention pertains. Of course, various forms of modifications and variations are possible within the technical spirit of the present invention and within the scope of the claims described below.

10-compressor 20-cylinder block
22-cylinder bore 23-piston
30-rotation axis 40-front housing
50-rear housing 51-discharge room
52-suction chamber 60-valve assembly
61-valve plate 62-discharge outlet
63- Suction port 64- Suction reed valve
66-Discharge reed valve 65-Gasket
66- Discharge reed valve 80- Swash plate
100- communication path 120- communication path
140-The passage 160-Jungchin
180-protrusion jaw 200-regulator valve
210-Spool 220-Daekyung
240-small diameter 300-return spring

Claims (9)

A communication path (100) connecting the discharge chamber (51) and the control chamber (41) to enable mutual communication; And
It is installed in the communication path 100 is provided with a regulator valve 200 that is opened and closed adjustment according to the pressure of the discharge chamber 51,
The regulator valve 200,
Large diameter portion 220 to minimize the flow cross-sectional area of the communication path 100; And
It is provided with a spool 210 having a small diameter portion 240 extending from the large diameter portion 220 to maximize the flow cross-sectional area of the communication path 100,
The spool 210 is installed to be supported by the return spring 300 to provide a restoring force in the direction of maximizing the flow cross-sectional area of the refrigerant in the communication path 100,
The communication path 100 corresponds to the communication path portion 120 corresponding to the large-diameter portion 220 of the regulator valve 200, and the small-diameter portion 240 of the regulator valve 200, and the return spring 300 ) Is provided with a passage (140) for installing,
A variable capacity swash plate type compressor, characterized in that the diameter of the communication channel portion (120) of the communication path (100) is set larger than the large diameter portion (220) of the spool (210). delete delete The method according to claim 1,
The communication path 100 forms a stepped surface-shaped locking jaw 160 for seating and supporting one end of the return spring 300 between the communication path 120 and the large passage 140. , The communication path 100 is a variable-capacity swash plate type compressor, characterized in that to form a protruding jaw (180) protruding toward the inner center to suppress the departure of the spool (210) at the entrance. The method according to claim 4,
The protruding jaw 180 is a variable capacity swash plate type compressor, characterized in that it consists of a snap ring detachably assembled to the inner circumferential surface of the entrance of the communication path (100). The method according to claim 1,
The spool 210 of the regulator valve 200 is a variable displacement swash plate type compressor characterized in that it forms a guide projection (212) for guiding the flow of the refrigerant on the surface. The method according to claim 6,
The guide projection 212 is a variable displacement swash plate type compressor, characterized in that made of a spiral to help the formation of a vortex in the flow field of the refrigerant. The method according to claim 1,
The spool 210 of the regulator valve 200 is provided with a variable-capacity swash plate, characterized in that it has a wing portion 242 protruding outward from the small diameter portion 240 for contact with the return spring 300 Type compressor. The method according to claim 8,
The wing portion 242 is a variable displacement swash plate type compressor, characterized in that radially disposed with respect to the center of the small diameter portion 240 while protruding outward along the axial direction of the spool (210).

Images