KR20070106858A - Variable capacity type swash plate type compressor - Google Patents

Abstract

A variable capacity type swash plate compressor is provided to facilitate discharge of foreign matters by installing a check valve which covers one side of a discharge muffler chamber, and contouring a distal end of a valve element as a conical shape. A variable capacity type swash plate compressor comprises a cylinder block, a front housing, a driveshaft, a plurality of pistons, a rear housing, and a check valve(190). The cylinder bore includes a plurality of cylinder bores inside. The front housing is coupled in front of the cylinder block, defining a crank chamber therein. The driveshaft is rotatably installed in the cylinder block and the front housing. The plurality of pistons is interlocked with a swash plate which is mounted to the driveshaft and rotating inside the crank chamber, and reciprocates inside the cylinder bore. The rear housing is coupled on the rear side of the cylinder block, having a suction chamber and a discharge chamber that are defined by a partition wall, wherein a discharge muffler chamber is defined in the discharge chamber by a barrier to attenuate pulsation pressure caused by discharged refrigerant. The check valve is installed on a refrigerant discharge path of the rear housing, allowing the refrigerant to circulate inside the compressor when an air conditioner is turned off and preventing back flow of the refrigerant. The check valve consists of a cover part(191) inserted and combined to the inside of the barrier to cover one side of the discharge muffler chamber, having a refrigerant inlet(191a) on its middle portion, a valve body(192) combined at one side of the cover part by a connection member(195), having a refrigerant outlet(192a), and a valve element(193) movably installed between the cover part and the valve body, having at least an incline(193a) where contacted by the refrigerant inlet, so as to elastically open and close the refrigerant inlet with an elastic member(194) having a conical distal end and supported at the valve body side, and to facilitate discharge of foreign matters.

Description

Variable capacity swash plate type compressor

1 is a cross-sectional view showing a conventional variable displacement swash plate compressor;

2 is a cross-sectional view showing a check valve in a conventional variable displacement swash plate compressor;

3 is a cross-sectional view showing a variable displacement swash plate compressor according to the present invention;

4 is a cross-sectional view taken along the line A-A in FIG.

5 to 7 are cross-sectional views showing various embodiments of the check valve in the variable displacement swash plate compressor according to the present invention.

<Description of Signs of Major Parts of Drawings>

100: compressor 110: cylinder block

111: cylinder bore 112: suction port

113: suction muffler chamber 120: front housing

121: crankcase 122: bearing

130: rear housing

131: suction chamber 132: discharge chamber

133: discharge passage 134: partition wall

135: bulkhead 136: control valve port

140: valve unit 141: valve plate

142: suction port 143: discharge port

150: drive shaft 160: swash plate

161: rotor 162: hinge means

163: sleeve 164: compression coil spring

165: piston 166: shoe

170: control valve 171: capacity control passage

180: discharge muffler chamber 190: check valve

191: cover portion 191a: refrigerant inlet hole

191b, 193a: slope 191c: bead

192: valve body 192a: refrigerant discharge hole

192b: support 192c: flange

193: valve body 193b: guide

193c: flat

194: elastic member 195: coupling means

196: Retainer

The present invention relates to a variable displacement swash plate compressor, and more particularly, a check valve for circulating the refrigerant inside the compressor at the time of turning off the air conditioner and preventing backflow of the refrigerant to one side of the discharge muffler chamber. Variable-capacity type swash plate compressor that can be installed as a cover type but forms a tip of the valve body in a conical shape to prevent foreign substances from stagnation and smooth discharge, preventing backflow of discharged refrigerant by improving sealing property and reducing the flow resistance of refrigerant. It is about.

Compressor constituting the air conditioner for automobile is a device that selectively receives the power from the power source by the intermittent action of the electronic clutch, sucks the refrigerant gas from the evaporator, compresses it by the linear reciprocating motion of the piston, and discharges it toward the condenser. . These compressors are divided into various types according to the compression method and structure, and among these compressors, variable capacity compressors that can change the compression volume are also widely used.

1 is a cross-sectional view illustrating a conventional general variable displacement swash plate compressor, wherein the variable displacement swash plate compressor 1 includes a cylinder block 10 having a plurality of cylinder bores 11 therein, and the cylinder block. The front housing 20 is coupled to the front of the (10) to form a crank chamber 21 therein, and is coupled through the valve unit 40 to the rear of the cylinder block 10 and the suction chamber 31 and A rear housing 30 having a discharge chamber 32 and a discharge passage 33 is provided.

Here, a suction port 12 and a suction muffler chamber 13 are formed in the cylinder block 10 so that refrigerant flows into the suction chamber 31.

The drive shaft 50 is rotatably installed on the cylinder block 10 and the front housing 20, and the rotor 61 is firmly mounted on the drive shaft 50 in the crank chamber 21. Is connected to the hinge means 62 and rotates together with the swash plate 60 is mounted to change the inclination angle corresponding to the pressure change of the crank chamber (21).

In addition, a plurality of pistons installed on the outer circumference of the swash plate 60 via the shoe 64 and reciprocating the inside of the cylinder bore 11 in conjunction with the rotational movement of the swash plate 60 to suck / compress the refrigerant. 65 is provided.

The rear housing 30 includes a control valve 80 for varying the pressure difference between the refrigerant suction pressure in the cylinder bore 11 and the gas pressure in the crank chamber 21 so that the inclination angle of the swash plate 60 varies according to the heat load. It is installed in).

In addition, a discharge muffler chamber 90 is provided in the discharge chamber 32 of the rear housing 30 to reduce the pulsation pressure of the discharge refrigerant, and the discharge muffler chamber 90 is formed in the discharge chamber 32. The partition wall 91 is formed by a cover 92 which is coupled to one side of the partition wall 91 and the coolant inlet hole 93 is formed. Accordingly, the refrigerant discharged from the cylinder bore 11 into the discharge chamber 32 moves to the discharge muffler chamber 90 through the small diameter refrigerant inlet hole 93 formed in the cover 92, and then discharge passage 33. It is discharged to outside through). That is, the pulsation pressure is reduced in the process of expanding, reducing, and expanding the refrigerant while passing through the discharge chamber 32, the refrigerant inlet hole 93, and the discharge muffler chamber 90.

Meanwhile, a compression coil spring 63 is installed between the rotor 61 and the swash plate 60 to return to the initial position of the swash plate 60.

As described above, when the drive shaft 50 is rotated by the power of the engine, the variable displacement swash plate compressor 1 includes a swash plate 60 mounted on the drive shaft 50 so that the inclination angle can be adjusted. While rotating together with the 50, the front and rear swings, so that the plurality of pistons 65 coupled to the outer circumference of the swash plate 60 is a distance proportional to the inclination angle of the swash plate 60 of the cylinder block 10 The cylinder bore 11 is reciprocated sequentially.

In this case, the suction stroke (not shown) of the valve unit 40 is opened by the pressure drop in the cylinder bore 11 during the suction stroke of the piston 65 to open the cylinder bore 11 and the suction chamber 31. ) Is communicated with the refrigerant flows into the cylinder bore (11) from the suction chamber (31).

In the compression stroke of the piston 65, the refrigerant is compressed by an increase in the pressure inside the cylinder bore 11, and the discharge valve (not shown) of the valve unit 40 is opened to open the cylinder bore 11. Since the discharge chamber 32 is in communication, the compressed refrigerant is discharged from the cylinder bore 11 to the discharge chamber 32.

In addition, since the inclination angle of the swash plate 60 is adjusted in response to the pressure difference between the pressure in the crank chamber 21 and the suction pressure in the cylinder bore 11, the discharge capacity of the compressor 1 is varied.

On the other hand, in the vehicle in which the clutchless variable displacement swash plate compressor 1 is used as described above, the minimum swash plate angle is maintained when the air conditioner is turned off, but the angle is not 0 °, so the refrigerant is discharged even when the air conditioner is turned off. To prevent this, a check valve 70 is currently used.

The check valve 70 is inserted into the discharge passage 33 of the rear housing 30 to allow the refrigerant to circulate inside the compressor 1 when the air conditioner is turned off, and to prevent the reverse flow of the refrigerant from the outside. .

That is, since the check valve 70 is opened only when a predetermined pressure or more is applied, the check valve 70 is closed due to a slight pressure when the air conditioner is turned off at the minimum swash angle. Therefore, when the air conditioner is off, the refrigerant inside the compressor 1 is circulated inside without being discharged to the outside.

The check valve 70 is a cover portion 71 is inserted / coupled to the inside of the partition wall 91, the refrigerant inlet hole 71a is formed in the center, and one side of the cover portion 71 as shown in FIG. Coupled to the valve body 72 having a refrigerant discharge hole 72a formed therein, and being elastically installed between the cover portion 71 and the valve body 72 and supported on the valve body 72 side. It consists of the valve body 73 which elastically opens and closes the said refrigerant | coolant inflow hole 71a by the member 74. As shown in FIG.

Here, the cover portion 71 has an extension portion 71b which extends the refrigerant inlet hole 71a in the valve body 73 side direction, and the tip portion of the valve body 73 has the cover portion ( It is formed in the form of a flat (73a) so as to be in flat contact with the extension portion (71b) side of the 71, the edge portion (73b) is formed to surround the outer peripheral surface of the extension (71b). In addition, a plurality of passage grooves 73c are formed in the edge portion 73b of the valve body 73 so that refrigerant may pass through when the check valve 70 is opened.

Accordingly, when the check valve 70 is closed, the valve body 73 comes into flat contact with the extension part 71b of the cover part 71 while the refrigerant is circulated in the compressor 1 when the air conditioner is turned off. At the same time to prevent the reverse flow of the external refrigerant.

However, since the valve body 73 has a structure in which the check valve 70 is closed while being in flat contact with the cover part 71 side, when foreign matter is caught or stuck in the flat contact part, it is difficult to discharge the foreign material. There is a problem that the deterioration. When the sealing property is deteriorated in this way, the refrigerant discharged to the outside flows backward, which causes the function of the check valve 70 to be lost, and there is a problem that noise occurs during the reverse flow.

In addition, the check valve 70 having the above-described structure also has a problem that vortex occurs when opened.

On the other hand, the check valve 70 is provided on the rear side (downstream side) of the discharge muffler chamber 90, causing pulsation noise of the discharge refrigerant, and a separate discharge muffler chamber ( In order to form 90, the cover 92 having the coolant inlet hole 93 formed on one side of the partition wall 91 must be separately coupled, thereby increasing the number of parts and the number of labor.

An object of the present invention for solving the above problems is to install a check valve on one side of the discharge muffler chamber to prevent the backflow of the refrigerant while circulating the refrigerant inside the compressor when the air conditioner (OFF) OFF (OFF) However, by forming the tip of the valve body in a conical shape, it is possible to provide a variable displacement swash plate compressor that can smoothly discharge foreign substances without stagnation, thereby preventing backflow of the discharged refrigerant by improving sealing properties and reducing the flow resistance of the refrigerant. .

The present invention for achieving the above object is a cylinder block having a plurality of cylinder bores therein; A front housing coupled to the front of the cylinder block to form a crank chamber therein; A drive shaft rotatably installed on the cylinder block and the front housing; A plurality of pistons mounted to the drive shaft to reciprocate the inside of the cylinder bore in conjunction with a swash plate rotating in the crank chamber; A rear housing which is coupled to the rear of the cylinder block and has a suction chamber and a discharge chamber partitioned therein by partition walls, and a discharge muffler chamber partitioned by a partition wall to reduce the pulsating pressure of the discharge refrigerant in the discharge chamber; The variable displacement swash plate type compressor comprising a check valve installed on the refrigerant discharge path of the rear housing to allow the refrigerant to circulate in the compressor when the air conditioner is turned off and to prevent the backflow of the refrigerant. A cover part which is inserted / coupled to the inside of the partition wall to cover one side of the discharge muffler chamber and has a coolant inlet hole formed at the center thereof, and is coupled to one side of the cover part by a coupling means and a coolant discharge hole is formed on the cover body; It is installed in a space between the valve body and the valve body and elastically supported by the elastic member supported on the valve body to open and close the refrigerant inlet hole at least has a slope in contact with the refrigerant inlet hole so that the foreign matter is smoothly discharged It characterized by including a valve body.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Repeated description of the same construction and operation as in the prior art will be omitted.

3 is a cross-sectional view showing a variable displacement swash plate compressor according to the present invention, Figure 4 is a cross-sectional view taken along the line AA in Figure 3, Figures 5 to 7 of the check valve in the variable displacement swash plate compressor according to the present invention Sectional drawing showing various embodiments.

As shown, the variable displacement swash plate compressor 100 according to the present invention is coupled to the cylinder block 110, a plurality of cylinder bores 111 formed therein, the front of the cylinder block 110 is sealed inside The front housing 120 forming the crank chamber 121 and the valve block 140 are coupled to the rear of the cylinder block 110, and the cylinder block is formed in the inner region by the partition of the partition wall 134. The discharge chamber 132 is filled with the refrigerant introduced from the 110 is formed in the outer housing around the rear housing 130 is formed with the suction chamber 131 is filled with the refrigerant introduced from the outside.

The valve unit 140 may be provided with a valve plate 141 having a suction port 142 and a discharge port 143, and suction valves installed at both side surfaces of the valve plate 141 to open and close the suction port 142. ) And a discharge valve (not shown) for opening and closing the discharge port 143. Therefore, during the suction stroke of the piston 165, the refrigerant is sucked into the cylinder bore 111 from the suction chamber 131, and the compressed refrigerant is discharged from the cylinder bore 111 into the discharge chamber 132 during the compression stroke.

A discharge passage 133 is formed in the rear housing 130 to allow the refrigerant in the discharge chamber 132 to be discharged to the outside, and a control valve port to appropriately adjust the refrigerant capacity of the crank chamber 121. A control valve 170 is installed at 136.

In addition, when the control valve 170 is opened, the capacity control in communication with the crank chamber 121 from the control valve port 136 so that the refrigerant and oil in the discharge chamber 132 flows into the crank chamber 121 side. A passage 171 is formed.

An suction muffler chamber 113 having a suction port 112 is formed at an outer side of the cylinder block 110 to allow refrigerant to flow from the outside, and the suction muffler chamber 113 is a suction chamber of the rear housing 130. It is in communication with 131.

In addition, a driving shaft 150 is rotatably supported on the cylinder block 110 and the front housing 120 through the bearing 122.

On the drive shaft 150 in the crank chamber 121, the rotor 161 is coupled to transmit the rotation of the drive shaft 150 to the swash plate 160, the rotor 161 is the inner surface of the front housing 120 Is rotatably supported.

Then, the swash plate 160 is mounted on the drive shaft 150 to be coupled to the rotor 161 by the hinge means 162 so that the inclination angle can be changed in response to the pressure change of the crank chamber 121.

In addition, the sleeve 163 coupled to the inside of the swash plate 160 is slidably coupled to the drive shaft 150 to enable the inclined movement of the swash plate 160.

A linear reciprocation in the cylinder bore 111 is coupled through a pair of hemispherical shoes 166 facing the outer circumferential side slide surface of the swash plate 160 and the rotational rocking motion of the swash plate 160. A plurality of pistons 165 are installed to suck / compress the refrigerant while moving.

On the other hand, the compression coil spring 164 is installed between the rotor 161 and the sleeve 163 to return to the initial position of the swash plate 160.

In addition, the discharge muffler chamber 180 is formed in the discharge chamber 132 to reduce the pulsation pressure of the discharge refrigerant.

The discharge muffler chamber 180 forms a circular partition wall 135 in a central position of the discharge chamber 132 so that the discharge muffler chamber 180 can be partitioned from the inside of the discharge chamber 132, and an opening side of the partition wall 135 Combining the check valve 190 to be described below is configured.

That is, a check valve 190 is installed on the refrigerant discharge path of the rear housing 130 to allow the refrigerant to circulate inside the compressor 100 when the air conditioner is turned off and to prevent the reverse flow of the refrigerant from the outside. In the present invention, the discharge muffler chamber 180 is formed by the check valve 190.

Here, the check valve 190 is coupled to the inside of the partition 135 to cover one side of the discharge muffler chamber 180, at this time the end of the partition 135 to secure the space of the discharge muffler chamber 180 Are coupled to the side.

The check valve 190 is inserted / coupled to the inside of the partition 135 to cover one side of the discharge muffler chamber 180, and a cover 191 formed with a refrigerant inlet hole (191a) in the center, A valve body 192 coupled to one side of the cover unit 191 and having a refrigerant discharge hole 192a formed therein, and flows in a space between the cover unit 191 and the valve body 192. In addition, the refrigerant inlet hole 191a is opened and closed elastically by the elastic member 194 supported by the valve body 192, and the refrigerant inlet hole 191a is smoothly discharged without being stuck. It consists of the valve body 193 which has the inclined surface 193a at least in the part to make.

5 to 7, the valve body 193 may be formed in various forms including the inclined surface 193a having a front end contacting the refrigerant inlet hole 191a of the cover 191.

That is, the tip portion of the valve body 193 shown in FIG. 5 is formed in a conical shape, and the tip portion of the valve body 193 shown in FIG. 6 is formed in a cone shape, and the end portion thereof is formed in a plane 193c. The valve body 193 illustrated in FIG. 7 is formed to have the same structure as that of FIG. 6, but is formed such that the plane 193c formed at the end thereof is recessed to a certain depth. Of course, the above is an example of the valve body 193 and in addition to this can be formed in various forms.

6 and 7, the opening and closing operation of the valve body 193 is smooth and stable because the pressure of the refrigerant can be uniformly formed when the end portion of the valve body 193 is formed in the plane 193c.

On the other hand, it is preferable that the inclined surface 191b is formed in the portion of the refrigerant inlet hole 191a of the cover portion 191 in contact with the inclined surface 193a of the valve body 193. Therefore, when the check valve 190 is closed, the inclined surface 191b of the refrigerant inlet hole 191a and the inclined surface 193a of the valve body 193 may improve sealing properties. In addition, since the foreign matter is smoothly discharged without stagnation by the inclined surface 193a, the sealing property is further improved to prevent backflow of the external refrigerant.

A guide 193b protrudes from the rear end of the valve body 193, and a support part slidably supports the guide 193b on an inner side surface of the valve body 192 corresponding to the guide 193b. 192b) is formed. That is, the valve body 192 is formed to have a cross-section of the "c" shape and the support portion 192b is formed to protrude in the center of the inner surface of the valve body 192, the inner side of the guide 193b sliding It is inserted as possible.

In addition, one end of the elastic member 194 is supported by being fitted to the outer circumferential surface of the support part 192b.

In addition, the coupling unit 195 for coupling the cover unit 191 and the valve body 192 forms a flange 192c on one side outer circumferential surface of the valve body 192, and on one side of the cover unit 191 It is made by forming a bead (191c) bent to surround the flange (192c).

On the other hand, the check valve 190 is preferably press-fitted / coupled to the inside of the partition wall 135, in this case, the retainer to prevent the separation after the coupling of the check valve 190 on the inside of the partition wall (135). 196 is combined.

In addition, the check valve 190 is coupled to the partition 135 formed at the center of the discharge chamber 132 is installed in the center of the discharge chamber 132 to prevent the superposition of the pulsating pressure waveform when discharging the high-pressure refrigerant do.

In the present invention, since the discharge muffler chamber 180 is formed by the check valve 190, the components for separately forming the discharge muffler chamber 90 (formerly known) can be omitted. Can be reduced and the pulsation pressure (pulsation noise) of the discharged refrigerant can be reduced, and the check valve 190 is installed in the discharge muffler chamber 180 where the installation area is secured to check without increasing the size of the compressor 100. Valve 190 can be installed.

Hereinafter, the refrigerant circulation process of the variable displacement swash plate compressor 100 according to the present invention will be described.

First, when the drive shaft 150 is rotated by the power of the engine, the swash plate 160 mounted on the drive shaft 150 is rotated together with the drive shaft 150 to swing in the front and rear direction, thereby swash plate 160 A plurality of pistons 165 coupled to the outer circumference of the sequential reciprocating movement in the cylinder bore 111 of the cylinder block 110 is repeated intake / compression stroke.

Here, the suction stroke of the piston 165, the suction valve (not shown) of the valve unit 140 is opened by the pressure drop in the cylinder bore 111, the cylinder bore 111 and the suction chamber 131 ) Is communicated with the refrigerant supplied into the suction chamber 131 through the suction port 112 and the suction muffler chamber 113 from the outside into the cylinder bore (111).

In addition, during the compression stroke of the piston 165, the refrigerant is compressed by an increase in the pressure inside the cylinder bore 111, and the discharge valve (not shown) of the valve unit 140 is opened to the cylinder bore 111. Since the discharge chamber 132 is in communication with each other, the compressed refrigerant is discharged from the cylinder bore 111 to the discharge chamber 132.

Subsequently, the refrigerant discharged into the discharge chamber 132 is a high temperature and high pressure refrigerant, and the check valve 190 is opened by the high pressure refrigerant. When the check valve 190 is opened, the discharge chamber ( The refrigerant discharged to the 132 passes through the refrigerant inlet hole 191a and the refrigerant discharge hole 192a of the check valve 190 to the discharge muffler chamber 180, and is then discharged to the outside through the discharge passage 133. Will be.

At this time, the refrigerant in the discharge chamber 132 is enlarged in the discharge chamber 132 in the process of moving to the discharge muffler chamber 132 after passing through the check valve 190, and reduced while passing through the check valve 190 As the discharge muffler chamber 180 expands again, the pulsation pressure of the discharge refrigerant is reduced.

On the other hand, when the air conditioner is turned off, as described above, the swash plate angle of the swash plate 160 is minimized so that there is almost no flow of the coolant and the pressure of the coolant is small so that the check valve 190 is closed, so that the coolant is compressed in the compressor ( In addition to the circulation in the interior 100, the backflow of the external refrigerant is prevented.

According to the present invention, when the air conditioner is off (OFF), the refrigerant is circulated in the compressor and prevents the reverse flow of the refrigerant to install a check valve on one side of the discharge muffler chamber as a cover type, but the tip of the valve body is conical By forming the phase, foreign matter is smoothly discharged without stagnation, thereby preventing backflow of the discharged refrigerant due to the improvement of sealing property and reducing the flow resistance of the refrigerant.

In addition, since the check valve is installed on one side of the discharge muffler chamber as a cover type, the discharge muffler chamber is formed by the check valve, thereby reducing the number of parts and labor and reducing the pulsation pressure (pulsation noise) of the discharge refrigerant.

Claims (5)

A cylinder block 110 having a plurality of cylinder bores 111 therein; A front housing 120 coupled to the front of the cylinder block 110 to form a crank chamber 121 therein; A drive shaft 150 rotatably installed on the cylinder block 110 and the front housing 120; A plurality of pistons 165 mounted to the drive shaft 150 to reciprocate the inside of the cylinder bore 111 in association with the swash plate 160 rotating in the crank chamber 121; The suction chamber 131 and the discharge chamber 132 are partitioned by the partition wall 134 and coupled to the rear of the cylinder block 110, and the pulsation pressure of the discharge refrigerant is reduced in the discharge chamber 132. A rear housing 130 in which a discharge muffler chamber 180 is partitioned by partition walls 135; Is installed on the refrigerant discharge path of the rear housing 130 variable to include a check valve 190 to allow the refrigerant to circulate in the compressor 100 when the air conditioner (OFF) OFF and to prevent the back flow of the refrigerant In the capacitive swash plate compressor, The check valve 190 is inserted / coupled to the inside of the partition 135 to cover one side of the discharge muffler chamber 180, and a cover 191 formed with a coolant inlet hole (191a) in the center, and A valve body 192 which is coupled to one side of the cover part 191 by a coupling means 195 and a refrigerant discharge hole 192a is formed, and is movable in a space between the cover part 191 and the valve body 192. In addition, the refrigerant inlet hole 191a is opened and closed elastically by the elastic member 194 supported by the valve body 192, and at least a portion of the refrigerant inlet hole 191a contacts the refrigerant inlet hole 191a so as to smoothly discharge the foreign matter. A variable displacement swash plate compressor comprising a valve body (193) having an inclined surface (193a). The method of claim 1, A variable displacement swash plate compressor, characterized in that the tip portion of the valve body (193) has a conical shape. The method of claim 1, A variable displacement swash plate type compressor, characterized in that the tip portion of the valve body (193) is formed in a conical shape, the end portion thereof is formed in a plane (193c). The method of claim 3, wherein A variable displacement swash plate compressor, characterized in that the plane (193c) formed at the end of the valve body (193) is recessed to a certain depth. The method of claim 1, The refrigerant inlet hole (191a) is a variable displacement swash plate type compressor, characterized in that the inclined surface (191b) is formed in a portion in contact with the inclined surface (193a) of the valve body (193).

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