CN101067410A - Inclined plate variable capacity compressor - Google Patents

Abstract

The present invention relates to a variable capacity swash plate type compressor, in which a check valve for circulating refrigerant inside a compressor and preventing a backflow of the refrigerant when an air conditioner is turned off is mounted on a side of a discharge muffler chamber in a cover type so that the discharge muffler chamber is formed by the check valve, thereby reducing the number of components, the number of work processes, and a pulsating pressure (pulsating noise) of discharged refrigerant, allowing that the check valve is mounted at the center of a discharge chamber without any increase in size of the compressor, preventing an overlapping phenomenon of a pulsating pressure waveform of a high-pressure refrigerant at the time of discharge since the check valve is located at the center of the discharge chamber, and preventing a separation of the check valve by fixing the check valve in the discharge chamber via a retainer.

Description

Inclined plate variable capacity compressor

technical field

The present invention relates to a slanting plate type variable capacity compressor, and more particularly to such a slanting plate type variable capacity compressor, that is, a stopper for circulating refrigerant in the compressor and preventing the refrigerant from backflowing when the air conditioner is turned off. The return valve is installed in the form of a cover on one side of the discharge muffler chamber so that the discharge muffler chamber is formed by the check valve, thereby reducing the number of parts, the number of working procedures, and reducing the pulsating pressure of the discharged refrigerant (pulsation noise ), so that the check valve can be installed at the center of the discharge chamber without increasing the size of the compressor, thereby preventing the pulsation pressure waveform superposition phenomenon of the high-pressure refrigerant at the time of discharge due to the check valve being positioned at the center of the discharge chamber, and Separation of the check valve is prevented by securing the check valve in the discharge chamber by means of the retainer.

Background technique

In general, a compressor constituting a car air conditioner operates by selectively receiving driving power from a power source through the restrictive action of an electromagnetic clutch, sucking refrigerant gas from an evaporator, compressing the refrigerant gas through linear reciprocating motion of a piston, and The refrigerant gas is discharged towards the condenser. Such compressors are classified into various types according to compression methods and structures, and variable capacity compressors that can change a compression volume have been widely used among various types of compressors.

FIG. 1 is a cross-sectional view of a swash plate type variable capacity compressor according to the prior art. Referring to FIG. 1 , a swash plate type variable capacity compressor 1 according to the prior art includes: a cylinder block 10 having a plurality of cylinder holes 11 formed therein; a front cover 20 joined to the front of the cylinder block 10 and having a crankcase 21 formed therein; a rear cover 30 which is joined to the rear of the cylinder block 10 by interposing a valve unit 40 therebetween, and has a suction chamber 31, a discharge chamber 32 and discharge channel 33 .

Here, the cylinder block 10 has a suction port 12 and a suction muffler chamber 13 so that refrigerant is introduced into the suction chamber 31 through the suction port 12 and the suction muffler chamber 13 .

In addition, the drive shaft 50 is rotatably installed on the cylinder block 10 and the front cover 20, and the swash plate 60 is installed in the crankcase 21 so that the drive shaft 50 is firmly installed on the rotating member 61 and the hinge device 62 and The drive shaft 50 is connected to rotate together with the drive shaft 50 , and changes the inclination angle corresponding to the pressure change of the crankcase 21 .

In addition, a plurality of pistons 65 are installed on the outer periphery of the swash plate 60 by inserting shoes 64 on the outer periphery of the swash plate 60, so that the pistons 65 move in the cylinder bore 11 in cooperation with the rotational movement of the swash plate 60. The refrigerant is sucked in and compressed while reciprocating inside.

Also, a control valve 80 is installed on the rear cover 30 to change the pressure difference between the refrigerant suction pressure of the cylinder bore 11 and the gas pressure of the crankcase 21 to change the inclination angle of the swash plate 60 .

In addition, a discharge muffler chamber 90 is disposed in the discharge chamber 32 of the rear cover 30 to reduce the pulsation pressure of the discharged refrigerant. The discharge muffler chamber 90 includes a partition wall 91 formed in the discharge chamber 32 and a cover 92 coupled to one side of the partition wall 91 and having a refrigerant inflow hole 93 . Accordingly, refrigerant discharged from the cylinder bore 11 to the discharge chamber 32 moves to the discharge muffler chamber 90 through the small-diameter refrigerant inflow hole 93 formed on the cover 92 , and then is discharged to the outside through the discharge passage 33 . That is, the pulsation pressure is reduced by the process of expanding, contracting, and expanding the refrigerant while sequentially passing through the discharge chamber 32 , the refrigerant inflow hole 93 , and the discharge muffler chamber 90 .

Meanwhile, a compression coil spring 63 is installed between the rotating member 61 and the swash plate 60 to return the swash plate 60 to its original position.

As described above, when the drive shaft 50 is rotated by the driving power of the engine, the swash plate 60 mounted on the drive shaft 50 is swung in the front-rear direction in a manner of adjusting the inclination while rotating together with the drive shaft 50 , thus being coupled to A plurality of pistons 65 on the outer periphery of the swash plate 60 reciprocate sequentially in the cylinder bore 11 of the cylinder block 10 , and the length of the movement distance is proportional to the inclination angle of the swash plate 60 .

Here, during the suction stroke of the piston 65, the suction valve (not shown) of the valve unit 40 is opened by the pressure drop of the cylinder bore 11, and thus the refrigerant is drawn in due to the fluid communication between the suction chamber 31 and the cylinder bore 11. The cylinder bore 11 is introduced from the suction chamber 31 .

In addition, during the compression stroke of the piston 65, the refrigerant is compressed by the pressurization of the cylinder bore 11, and the discharge valve (not shown) of the valve unit 40 is opened, and thus the discharge chamber 32 is fluidly communicated with the cylinder bore 11. The compressed refrigerant is discharged from the cylinder bore 11 to the discharge chamber 32 .

Also, since the inclination angle of the swash plate 60 is adjusted corresponding to the pressure difference between the pressure of the crankcase 21 and the suction pressure of the cylinder bore 11, the displacement of the compressor 1 varies.

At the same time, in the case of installing the clutchless swash plate type variable capacity compressor 1 in the vehicle, when the air conditioner is turned off, the compressor 1 maintains the minimum swash plate angle, but the angle is not 0 degrees, so the air conditioner does not operate discharge refrigerant. In order to prevent the above from happening, a check valve 70 is used in such a compressor 1 .

The check valve 70 is inserted and installed in the discharge passage 33 of the rear cover 30 to circulate the refrigerant inside the compressor 1 and prevent the refrigerant from flowing back from the outside when the air conditioner is turned off.

That is, since the check valve 70 is opened only when a pressure exceeding a predetermined level is applied, it is closed due to insufficient pressure at the minimum inclination angle of the swash plate when the air conditioner is not operating. Therefore, the refrigerant contained in the compressor 1 is circulated in the compressor 1 without being discharged to the outside when the air conditioner is not operating.

However, since the check valve 70 is installed on the rear side (downstream side) of the discharge muffler chamber 90, pulsation noise of the discharged refrigerant is generated.

In addition, since the cover 92 having the refrigerant inflow hole 93 must be additionally bonded to one side of the partition wall 91 to form the discharge muffler chamber 90 within the discharge chamber 32, the number of parts and the number of work processes are increased.

In addition, since the check valve 70 must be inserted and installed in the discharge passage 33 of the rear cover 30 , an installation space for the check valve 70 must be secured, thereby increasing the size of the compressor 1 .

Contents of the invention

Therefore, in order to solve the above-mentioned problems in the prior art, the present invention is made. The object of the present invention is to provide such a swash plate type variable capacity compressor, which is used to circulate the refrigerant in the compressor and prevent the refrigerant from A check valve for backflow when the air conditioner is turned off is installed in the form of a cover on one side of the discharge muffler chamber so that the discharge muffler chamber is formed by the check valve, thereby reducing the number of parts, the number of working procedures, And reduce the pulsating pressure (pulsation noise) of the discharged refrigerant, so that the check valve can be installed in the center of the discharge chamber without increasing the size of the compressor, so that since the check valve is positioned in the discharge chamber The superposition phenomenon of the pulsating pressure waveform of the high-pressure refrigerant at the time of discharge is prevented, and the check valve is prevented from being separated by fixing the check valve in the discharge chamber by means of a retainer.

In order to achieve the above object, according to the present invention, a swash plate type variable capacity compressor is provided, which comprises: a cylinder block, in which a plurality of cylinder holes are formed; a front cover, the front cover engaging to the front of the cylinder block and having a crankcase formed therein; a drive shaft rotatably mounted on the cylinder block and the front cover; a plurality of pistons mounted on the on the drive shaft and reciprocates in the cylinder bore in cooperation with a swash plate rotating in the crankcase; a rear cover joined to the rear of the cylinder block and having therein a suction chamber and a discharge chamber formed to be separated from each other by a partition wall, the discharge chamber having a discharge muffler chamber formed by partitioning by the partition wall to reduce pulsation pressure of the discharged refrigerant; and a check valve, The check valve is installed on the refrigerant discharge channel of the rear cover, so that the refrigerant circulates in the compressor and prevents the refrigerant from flowing back when the air conditioner is turned off. The inclined plate type variable capacity compressor is characterized in that, The check valve is joined to the inner side of the partition wall.

Description of drawings

The above and other objects, features and advantages of the present invention will be clear from the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings, in which:

Fig. 1 is a cross-sectional view of a swash plate type variable capacity compressor according to the prior art;

Fig. 2 is a cross-sectional view of the inclined plate type variable capacity compressor according to the present invention;

Fig. 3 is a sectional view taken along line A-A of Fig. 2;

4 is a partially enlarged sectional view of a discharge muffler chamber of a swash plate type variable capacity compressor according to the present invention; and

Fig. 5 is a sectional view of a check valve of a swash plate type variable capacity compressor according to the present invention.

Detailed ways

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the present invention, descriptions of components and operations that are the same as those of the related art will be omitted.

Fig. 2 is a sectional view of a swash plate type variable capacity compressor according to the present invention, Fig. 3 is a sectional view taken along line A-A of Fig. 2 , Fig. 4 is a partially enlarged sectional view of a discharge muffler chamber of a slant plate type variable capacity compressor, And Fig. 5 is a sectional view of the check valve of the swash plate type variable capacity compressor.

As shown in the figure, the swash plate type variable capacity compressor 100 according to the present invention includes: a cylinder block 110 having a plurality of cylinder holes 111 formed therein; a front cover 120 joined to the front of the cylinder block 110 and having a sealed crankcase 121 formed therein; a rear cover 130 joined to the rear of the cylinder block 110 by interposing a valve unit 140 therebetween, and having partition walls 134 The discharge chamber 132 and the suction chamber 131 are formed separately. The discharge chamber 132 is formed in the inner area and is filled with the refrigerant introduced from the cylinder block 110, and the suction chamber 131 is formed in the outer area and is filled with the refrigerant introduced from the outside. agent.

The valve unit 140 includes: a valve plate 141 having a suction hole 142 and a discharge hole 143; a suction valve (not shown) installed on one side of the valve plate 141 to open and close the suction hole 141; A valve (not shown) is installed on the other side of the valve plate 141 to open and close the discharge hole 143 . Accordingly, during a suction stroke of the piston 165 , refrigerant is sucked from the suction chamber 131 to the cylinder bore 111 , and then compressed refrigerant is discharged from the cylinder bore 111 to the discharge chamber 132 during a compression stroke of the piston 165 .

The rear cover 130 has a discharge passage 133 for discharging the refrigerant of the discharge chamber 132 to the outside, and a control valve 170 is installed on the control valve port 136 of the rear cover 130 to properly control the refrigerant content in the crankcase 121 .

Additionally, a content control passage 171 is in fluid communication from the control valve port 136 to the crankcase 121 to introduce refrigerant and oil from the discharge chamber 132 into the crankcase 121 when the control valve 170 is open.

The cylinder block 110 is formed on its outer side with a suction muffler chamber 113 having a suction port 112 to introduce refrigerant from the outside, and the suction muffler chamber 113 is connected to the suction muffler chamber 113 of the rear cover 130. Chamber 131 is in fluid communication.

Also, a drive shaft 150 is mounted on the cylinder block 110 and the front cover 120, and is rotatably supported by a bearing 122 interposed therebetween.

Inside the crankcase 121 , a rotating member 161 is coupled to the driving shaft 150 to transmit the rotational force of the driving shaft 150 to the swash plate 160 , and is rotatably supported on the inner surface of the front cover 120 .

In addition, the swash plate 160 is connected to the rotating member 161 through a hinge device 162 , and is installed on the driving shaft 150 in such a manner as to change an inclination angle corresponding to a pressure change of the crankcase 121 .

In addition, a sleeve 163 is installed on the inner surface of the swash plate 160 in a manner that allows the swash plate 160 to tilt, and is slidably coupled to the drive shaft 150 .

A plurality of pistons 165 are installed on the sliding surface of the swash plate 160 periphery in such a way that a pair of hemispherical shoes 166 facing each other are interposed between the pistons 165 and the swash plate 160, so that the plurality of pistons 165 can The refrigerant is sucked and compressed while linearly reciprocating within the cylinder bore 111 according to the rotational motion of the swash plate 160 .

Meanwhile, a compression coil spring 164 is installed between the rotating member 161 and the sleeve 163 to return the swash plate 160 to its original position.

Also, a discharge muffler chamber 180 is formed in the discharge chamber 132 to reduce the pulsation pressure of the discharged refrigerant.

The discharge muffler chamber 180 is constituted in such a manner that an annular partition wall 135 is formed at the center of the discharge chamber 132 to partition the discharge muffler chamber 180 from the inside of the discharge chamber 132, and a check valve 190 which will be described below Combined to the opening of the partition wall 135 .

That is, the check valve 190 is installed on the refrigerant discharge passage of the rear cover 130 to circulate the refrigerant inside the compressor 100 and prevent backflow of the refrigerant introduced from the outside when the air conditioner is in an off state. In the present invention, the discharge muffler chamber 180 is formed by the check valve 190 .

Therefore, the check valve 190 is joined to the inner side of the partition wall 135 to cover one side of the discharge muffler chamber 180 , and in this case is positioned at the end of the partition wall 135 to secure a space for discharging the muffler chamber 180 .

Here, it is preferable that the check valve 190 is forcibly joined to the inner side of the partition wall 135 , and in this case, a retainer 195 is installed on the inner surface of the partition wall 135 to prevent the check valve 190 from being separated from the partition wall 135 . Meanwhile, seating claws 135 a for seating the check valve 190 on the inner surface of the partition wall 135 are formed on the inner surface of the partition wall 135 .

In addition, since the check valve 190 is coupled to the partition wall 135 formed at the center of the discharge chamber 132, the check valve 190 is also installed at the center of the discharge chamber 132, thereby preventing a pulsating pressure waveform superposition phenomenon from occurring when high-pressure refrigerant is discharged.

As described above, since the discharge muffler chamber 180 is formed by the check valve 190, parts for forming the discharge muffler chamber 90 (used in the prior art) can be omitted, and thus the compressor 100 according to the present invention can reduce The number of parts and the number of work processes can be reduced and the pulsating pressure (pulsating noise) can be reduced, and since the check valve 190 is installed in the discharge muffler chamber 180 which can secure the installation area, it is possible to reduce the size of the compressor 100 without increasing the size of the compressor 100. Install the check valve 190 below.

Check valve 190 may be one of various known check valves. As shown in FIG. 5 , the check valve 190 includes: a cover portion 191 inserted into and joined to the inner side of the partition wall 135 and having a refrigerant inflow hole 191a formed in the center thereof; a valve body 192 joined to the cover portion 191 and a valve 193, which is not fixedly (fluidically) installed between the cover portion 191 and the valve body 192 for passing through the elastic member 194 supported on the valve body 192 The refrigerant inflow hole 191a is elastically opened and closed.

The valve body 192 has a cross section formed in a "" shape, and includes a support claw 192b protrudingly formed in the center thereof for supporting the elastic member 194, and a flange 192c formed at an outer peripheral surface on one side thereof.

In this case, the cover portion 191 and the valve body 192 are engaged with each other in such a manner that the valve body 192 is inserted into a bead 191b protrudingly formed on one side of the cover portion 191, and the bead 191b is bent. to surround the flange 192c of the valve body 192 .

When the air conditioner is off, since the minimum inclination angle of the swash plate is maintained but it is not 0 degrees, the refrigerant is discharged to the outside even when the air conditioner is off, but in this case, because the amount of refrigerant discharged So small that the pressure is insufficient, so the check valve 190 does not open. That is, since the check valve 190 is opened only when pressure exceeding a predetermined level is applied, the check valve 190 does not open due to insufficient pressure at the minimum inclination angle of the swash plate when the air conditioner is in an off state.

Therefore, when the air conditioner is in an off state, the compressor 100 does not discharge the refrigerant contained therein to the outside, but circulates the refrigerant therein and prevents the occurrence of backflow of the refrigerant introduced from the outside.

The following will describe the refrigerant cycle process of the swash plate type variable capacity compressor 100 according to the present invention.

First, when the drive shaft 150 is rotated by the driving power of the engine, the swash plate 160 mounted on the drive shaft 150 is rocked in the front-rear direction while rotating together with the drive shaft 150 , thereby being coupled to the outer circumference of the swash plate 160 . The piston 165 repeatedly performs a suction stroke and a compression stroke while sequentially reciprocating within the cylinder bore 111 of the cylinder block 110 .

Here, when the piston 165 performs the suction stroke, since the suction valve (not shown) of the valve unit 140 is opened by the pressure drop of the cylinder bore 111, the cylinder bore 111 and the suction chamber 131 are fluidly communicated with each other, so by the suction The refrigerant supplied from the suction port 112 and the suction muffler chamber 113 to the suction chamber 131 from the outside is introduced into the cylinder bore 111 .

In addition, when the piston 165 performs a compression stroke, since the refrigerant is compressed by the pressurization of the cylinder bore 111 and the discharge valve (not shown) of the valve unit 140 is opened to fluidly communicate the cylinder bore 111 and the discharge chamber 132 with each other, Compressed refrigerant is discharged from the cylinder bore 111 to the discharge chamber 132 .

Next, the refrigerant discharged to the discharge chamber 132 is a high-temperature and high-pressure refrigerant, so that the check valve 190 is opened by the high-pressure refrigerant. When the check valve 190 is opened, the refrigerant discharged to the discharge chamber 132 moves to the discharge muffler chamber 180 after passing through the refrigerant inflow hole 191 a and the refrigerant outflow hole 192 a, and then is discharged to the outside through the discharge passage 133 .

In this case, during the process of the refrigerant moving to the discharge muffler chamber 180 after passing through the check valve 190, the refrigerant expands in the discharge chamber 132, contracts while passing through the check valve 190, and discharges in the discharge muffler chamber. The chamber 180 is re-expanded, thereby reducing the pulsating pressure of the discharged refrigerant.

Meanwhile, as described above, when the air conditioner is not operating, since the inclination angle of the swash plate 160 is the smallest resulting in less flow of refrigerant and a lower pressure of the refrigerant, the check valve 190 is closed, and thus the refrigerant flows in the compressor 100. Inner loop.

As described above, according to the present invention, since the check valve that circulates the refrigerant inside the compressor and prevents the refrigerant from flowing back when the air conditioner is off is installed in the form of a cover on one side of the discharge muffler chamber, and the discharge The muffler chamber is formed by the check valve, so the swash plate type variable capacity compressor can reduce the number of components, the number of working processes, and reduce the pulsating pressure (pulsating noise) of the discharged refrigerant.

Also, the swash plate type variable capacity compressor allows the check valve to be installed in the discharge muffler chamber, which ensures an installation space for the check valve without increasing the size of the compressor.

In addition, since the check valve is positioned at the center of the discharge chamber, the slant plate type variable capacity compressor prevents a pulsating pressure waveform superimposition phenomenon when discharging high-pressure refrigerant.

In addition, the swash plate type variable capacity compressor can prevent the check valve from being separated by fixing the check valve in the discharge chamber by means of the retainer.

While the invention has been described with reference to specific illustrative embodiments, the invention is not to be limited by the embodiments but only by the appended claims. It is to be understood that changes or modifications may be made to the described embodiments by those skilled in the art without departing from the scope and spirit of the invention.

Claims (5)

1. variable capacity swash plate type compressor, this variable capacity swash plate type compressor comprises:

Cylinder block (110), this cylinder block have formation a plurality of cylinder-bore (111) within it;

Front shroud (120), this front shroud join the anterior of described cylinder block (110) to and have formation crankcase (121) within it;

Live axle (150), this live axle are rotatably installed on described cylinder block (110) and the described front shroud (120);

A plurality of pistons (165), described piston are installed on the described live axle (150), and move back and forth in described cylinder-bore (111) with the swash plate (160) of rotation in described crankcase (121) with matching;

Back cover (130), this back cover joins the rear portion of described cylinder block (110) to, and have suction chamber (131) and the drain chamber (132) that forms in the mode that separates each other by spaced walls (134) therein, described drain chamber (132) has by partition wall (135) separates the vent silencer chamber (180) that forms, to reduce the fluctuation pressure of refrigerant emission; And

Safety check (190), this safety check are installed on the refrigeration agent discharge passage of described back cover (130), thereby refrigeration agent is circulated in described compressor (100) and prevent that refrigeration agent from refluxing when air conditioner is closed,

This variable capacity swash plate type compressor is characterised in that described safety check (190) is engaged to the inboard of described partition wall (135).

2. variable capacity swash plate type compressor according to claim 1 is characterized in that, described safety check (190) is installed in the central authorities of described drain chamber (132).

3. variable capacity swash plate type compressor according to claim 1, it is characterized in that, one retainer (195) is bonded to described partition wall (135), to prevent that this safety check separates with described partition wall (135) after described safety check (190) has been bonded to the inboard of described partition wall.

4. variable capacity swash plate type compressor according to claim 1 is characterized in that, described safety check (190) comprising: cap (191), this cap have formation refrigeration agent ostium (191a) in the central; Valve body (192), this valve body are engaged in a side of described cap (191) and its and are formed with refrigeration agent tap hole (192a); And valve (193), this valve is not fixedly mounted between described cap (191) and the described valve body (192), is used for opening and closing described refrigeration agent ostium (191a) by elastic component (194) elasticity that is supported on the described valve body (192).

5. variable capacity swash plate type compressor according to claim 1 is characterized in that, described safety check (190) is forced to the inboard that crimping is bonded to described partition wall (135).

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