KR100873371B1 - Valve plate of reciprocating comrpessor - Google Patents

Abstract

A valve plate of a reciprocating compressor is provided to prevent the leakage of discharge oil between the valve plate and a cylinder block by branching an oil discharge path, even though the discharge pressure of the oil is high. A valve plate(300) of a reciprocating compressor includes a surface facing a piston and formed with an oil suction path(380a), an oil discharge path(380b) and a refrigerant supply path(390). The oil discharge path is branched into two or more paths(a, b) from the center part thereof toward an outer peripheral part for dispersing the initial pressure of oil properly to discharge the oil with low pressure not to be leaked to the refrigerant supply path, wherein the branched paths are connected to each other by a connection path(c) in the center part. The valve plate is in the shape of circle and the branched paths are extended from the center of the circle in the radial direction for uniform dispersion of the oil pressure.

Description

VALVE PLATE OF RECIPROCATING COMRPESSOR}

The present invention relates to a valve plate of a reciprocating compressor. More particularly, the present invention relates to a valve plate of a reciprocating compressor capable of preventing the discharge oil from leaking into the refrigerant supply passage by lowering the pressure of the discharged oil.

In general, a general reciprocating compressor commonly used as a compressor of a vehicle air conditioner is commonly provided with a piston, a piston drive device, a cylinder block and a valve.

As a representative example of such a reciprocating compressor, swash plate compressors are used in recent years.

In the swash plate type compressor, the inclination angle of the swash plate is changed according to the change of the heat load to achieve precise movement control by controlling the piston feed amount, while the inclination angle of the swash plate is continuously changed to reduce the sudden torque change of the engine by the compressor. There is a feature that can improve the riding comfort of the vehicle even during operation of the compressor.

In the reciprocating compressor, the refrigerant is sucked from the suction chamber, compressed by the piston, and the compressed refrigerant is discharged to the discharge chamber and sent to the cooling cycle.

The conventional swash plate type compressor includes a front housing and a rear housing, a cylinder block disposed between the front housing and the rear housing, a piston reciprocating in the cylinder bore of the cylinder block, and disposed in the housing. And a drive shaft for driving the piston by transmitting a rotational motion from external power, a swash plate connected to the plurality of pistons and connected to the drive shaft, and a swash plate chamber in which the swash plate and the like are accommodated.

In addition, a structure in which oil for lubricating the inside of the compressor is circulated is adopted.

Moreover, in recent years, the structure which forms and circulates the groove | channel which oil flows in the surface which opposes the piston of the said valve plate is adopted.

However, in the related art, only the function of circulating oil is focused without considering the pressure of the oil, and thus, when the pressure acts on the oil flow groove formed on the valve plate, the pressure leaks, thereby degrading the efficiency of the compressor.

In addition, a configuration for discharging the refrigerant remaining in the swash plate chamber is required separately, which also complicates the structure of the compressor.

The present invention has been made to solve the above-mentioned problems, the object of the invention is to reciprocating the compressor of the reciprocating compressor that can prevent the leakage of the leakage between the valve plate and the cylinder block even if the discharge pressure of the oil is high by branching the oil discharge passage To provide a valve plate.

In order to achieve the above object, the valve plate of the reciprocating compressor according to the present invention, the front housing and the rear housing, the cylinder block having a plurality of cylinder bores, and the front housing and the cylinder block can be rotated with respect to the A drive shaft supported by the drive shaft, a swash plate connected to the drive shaft so that the inclination angle can be changed while rotating together, a piston accommodated in the cylinder bore so as to be reciprocated by sliding with the swash plate, and the cylinder block. A valve plate of a reciprocating compressor, comprising a valve plate provided between one end of the rear housing and a rear housing and having a suction port and a discharge port, and a suction chamber and a discharge chamber formed in the rear housing via the valve plate, the surface facing the piston. Oil suction passage, oil discharge passage and refrigerant supply oil Is a capping formation, the oil discharge passage is composed of two or more branch flow path toward the peripheral portion from the central portion, and is characterized in that it is the branch flow path are connected to each other by a connecting passage at the center portion.

In this case, the valve plate is formed in a circular shape, the branch flow path is characterized in that extending radially from the center of the circular.

And, the connection flow path is characterized in that the circular arc having a concentric with the circular.

In addition, the oil suction passage is characterized in that it is formed extending from the central portion toward the opposite side of the oil discharge passage.

In addition, the oil suction passage is characterized in that extending in the radial direction of the circle.

On the other hand, the refrigerant supply passage is extended from the center of the circle toward the outer circumference and characterized in that the refrigerant flow hole is formed through the end.

According to the present invention having the above-described configuration, an oil suction passage, an oil discharge passage, and a refrigerant supply passage are formed on a surface facing the piston, and the oil discharge passage consists of two or more branch passages from the center to the outer peripheral portion. Since the branch passages are connected to each other by the connection passage in the central portion, even if the pressure of the oil discharged through the oil discharge passage is high, the branch passages may be properly dispersed and leaked into the refrigerant supply passage.

In addition, according to the present invention, since oil is appropriately supplied to the internal parts without leakage, it is possible to maintain the efficiency of the compressor.

Moreover, according to this invention, the flow of oil can be made smoother by specifying the shape of the said branch flow path and a connection flow path.

In addition, according to the present invention, it is possible to further smooth the flow of oil by specifying the shape of the oil suction passage.

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

As shown in FIG. 1, the reciprocating compressor 1000 of the present invention includes a cylinder block 110 having a front housing 120 and a rear housing 130, and a plurality of cylinder bores 110a. A drive shaft 140 rotatably supported by the cylinder block 110, a swash plate 150 connected to the drive shaft 140 by a connection link 600, and installed to change an inclination angle while rotating, and the swash plate A piston plate 200 that is reciprocally accommodated in the cylinder bore 110a by sliding with the 150, and a valve plate 300 installed between one end of the cylinder block 110 and the rear housing 130. ) And a suction chamber 131 and a discharge chamber 132 formed in the rear housing 130 via the valve plate 300.

Specifically, the front housing 120 and the rear housing 130 are respectively installed on both sides of the cylinder block 110, the valve plate 300 between the rear housing 130 and the cylinder block 110 It is installed.

In addition, a suction chamber 131 and a discharge chamber 132 are formed in the rear housing 130, and a suction port 331 communicating the cylinder bore 110a and the suction chamber 131 to the valve plate 300. ) And a discharge port 332 which communicates the cylinder bore 110a with the discharge chamber 132, respectively.

In addition, the suction port 331 and the discharge port 332 formed in the valve plate 300, the suction for opening and closing the suction port 331 and the discharge port 332 by the pressure change according to the reciprocating motion of the piston 200. The valve 350 and the discharge valve 360 are respectively provided.

2 and 3, according to the present embodiment, the oil suction passage 380a, the oil discharge passage 380b, and the refrigerant may be disposed on the surface of the valve plate 300 that faces the piston 200. A supply passage 390 is formed.

First, the oil discharge passage 380b is composed of two or more branch flow paths (a) and (b) extending from the center of the valve plate 300 to the outer circumference, and the branch flow paths (a) in the central portion (300a). (b) is mutually connected by the connection flow path c.

In this way, since two or more oil discharge passages 380b are branched, the starting pressure (pressure in the connection passage) of the oil can be properly dispersed and discharged at a low pressure state.

As a result, it is possible to prevent the discharged oil from leaking around the refrigerant supply passage 390 or the like due to the pressure.

In addition, the valve plate 300 is formed in a circular shape and the branch flow paths (a) (b) is preferably extended in the radial direction from the center of the circle. In this way, the pressure dispersion of the oil is made uniform, and the oil flows smoothly.

Furthermore, when the connecting flow path c is formed in an arc shape having concentricity with the circular shape, the flow of oil becomes smoother.

On the other hand, the oil suction passage 380a is formed to extend from the central portion 300a of the valve plate 300 toward the opposite side of the oil discharge passage 380b.

In particular, the oil suction passage 380a extends in the radial direction of the circular valve plate 300, so that oil is smoothly introduced. The outer end of the oil suction passage 380a communicates with the control valve 800 of the rear housing 130. Accordingly, when the oil separated from the refrigerant gas by the oil separator 700 passes through the control valve 800 and is stored in the lower portion of the cylinder block 110, the oil pump 910 passes through the oil suction passage 380a. It is drawn up and distributed to each part.

In addition, the coolant supply passage 390 extends from the center of the circular valve plate 300 to the outer circumference and the coolant flow hole 370 is formed through the outer end thereof. The refrigerant flow hole 370 is in communication with the suction chamber 131 of the rear housing 130.

On the other hand, the cylinder block 110 is formed with a plurality of cylinder bores (110a), the refrigerant introduced from the suction chamber 131 by the piston 200 reciprocating through the cylinder bore (110a) is continuous Is compressed.

The drive shaft 140 is rotatably supported by the front housing 120 and the cylinder block 110, the pulley (P) which is a power source is coupled to one end.

The swash plate 150 is slidably coupled to the piston 200 via the shoe 201.

Furthermore, the swash plate 150 is connected to the drive shaft 140 through a link structure.

That is, the link structure is connected to each of the connecting protrusions 155 formed before and after the swash plate 150, and the connecting protrusions 155 and the driving shaft 140, respectively, through the hinge pins 610. It consists of a link 600.

Accordingly, the connection link 600 and the connection protrusion 155 may be hinged with respect to the drive shaft 140.

Here, the oil separator 700 is built into the discharge chamber 132 of the rear housing 130.

That is, since some refrigerant is contained in the refrigerant sucked from the discharge chamber 132 of the rear housing 130, the oil is separated by centrifugal force through the oil separator 700, so that only the pure gaseous refrigerant is used as the refrigerant cycle. Can be distributed through.

In more detail, the oil separator 700 includes an inner recess 710 having a gas outlet 711 and an outer circumference formed along a circumference of the inner recess 710 and communicating with the discharge hole 332. And a recess 720 and an oil outlet 730 communicating from the inner recess 710 to the control valve 800.

Hereinafter, the operation of the valve plate according to the present invention will be described schematically while explaining the operation structure of the compressor and the flow structure of the refrigerant and oil.

First, when the compressor 1000 is operated, the pulley P connected to the engine (not shown) rotates, and the drive shaft 140 installed in the pulley P rotates.

As the drive shaft 140 rotates, the swash plate 150 rotates in a variable inclination, and the piston 200 performs a compression action while sliding by the swash plate 150. The refrigerant flows into the suction chamber 131 of the rear housing 130 according to the operation of the piston 200, and is continuously supplied to the cylinder bore 110a through the suction port 331 of the valve plate 300.

In addition, the refrigerant introduced through the inlet 331 of the valve plate 300 is compressed in the cylinder bore 110a by the piston 200, and the compressed refrigerant opens the discharge hole 332 of the valve plate 300. It flows into the outer recess 720 of the oil separator 700 through.

Subsequently, the refrigerant is introduced into the inner recess 710 from the outer circumference recess 720 through the refrigerant introduction groove 741 formed in the guide wall 740, and the refrigerant gas and the oil are separated by centrifugal force.

At this time, the oil having a high density accumulates at the bottom of the side of the inner recess 710 outside the gas outlet 711 and is continuously directed to the control valve 800 through the oil outlet 730.

The oil passing through the control valve 800 is supplied to the swash plate chamber 120a or the peripheral parts through the oil distribution hole 145 formed to penetrate along the longitudinal direction of the drive shaft 140 by the oil pump 910.

Then, the oil passing through each component is introduced into the cylinder bore (110a) through the oil discharge passage (380b) through the parts around the oil pump 910, and then the refrigerant that was present by the operation of the piston 200 Together with the discharge chamber 132.

Meanwhile, some refrigerant gas existing in the swash plate chamber 120a is introduced into the suction chamber 131 through the refrigerant flow hole 370 through the refrigerant suction hole 146 formed through the drive shaft 140. The refrigerant introduced into the suction chamber 131 is mixed with the refrigerant introduced through the cooling cycle.

In FIG. 1, the solid line represents the flow path of oil and the dotted line represents the flow path of the refrigerant.

The foregoing is only one embodiment of the present invention, and if the housing, the swash plate, the drive shaft, the piston and the cylinder bore, etc., can also be applied to the reciprocating compressor of other general configuration.

1 is a longitudinal sectional view showing a structure of a compressor to which a valve plate according to the present invention is applied.

2 is a front view showing the structure of the valve plate according to the present invention.

3 is a perspective view showing the structure of a valve plate according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: cylinder block 110a: cylinder bore

120: front housing 121: slate chamber

130: rear housing 140: drive shaft

150: swash plate 200: piston

201: shoe 300: valve plate

331: suction port 332: discharge port

700: oil separator 710: internal recess

720: external recess 730: oil outlet

1000: Swash Plate Compressor

Claims (6)

A front and rear housing, a cylinder block having a plurality of cylinder bores, a drive shaft rotatably supported with respect to the front housing and the cylinder block, and connected to the drive shaft so that the inclination angle can be changed while rotating together. A swash plate, a piston that is reciprocally accommodated in the cylinder bore by sliding with the swash plate, a valve plate installed between one end and the rear housing of the cylinder block, the inlet and the outlet being formed, and the valve plate. In the valve plate of the reciprocating compressor consisting of a suction chamber and a discharge chamber formed in the rear housing via a; An oil suction passage, an oil discharge passage, and a refrigerant supply passage are formed on a surface facing the piston, wherein the oil discharge passage includes two or more branch passages from the center to the outer periphery, and the branch passages in the connection portion are connected to the connection passage. Connected to each other by The valve plate has a circular shape, wherein the branch flow path is a valve plate of the reciprocating compressor, characterized in that extending radially from the center of the circle. delete The method of claim 1, The connecting passage is a valve plate of the reciprocating compressor, characterized in that the circular arc having a concentric with the circular. The method according to claim 1 or 3, And the oil suction passage extends from the central portion toward the opposite side of the oil discharge passage. The method of claim 4, wherein The oil suction passage is a valve plate of the reciprocating compressor, characterized in that extending in the radial direction. The method of claim 4, wherein The refrigerant supply passage extends from the center of the circle toward the outer circumference and the valve plate of the reciprocating compressor, characterized in that the refrigerant flow hole is formed through.

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