KR101093964B1 - Compressor - Google Patents

Abstract

The present invention relates to a compressor, in which a refrigerant is sucked into a cylinder bore through a hollow drive shaft, and the high pressure and high temperature gas remaining in the cylinder bore immediately after compression of the piston is returned to the swash plate chamber and mixed with the refrigerant sucked from the swash plate chamber. By lowering the temperature so as to prevent the cylinder bore from overheating due to the residual gas, the performance of the compressor can be improved.

To this end, the present invention is a swash plate rotating in the swash plate chamber in the compressor is inclined, the flow path is formed inside the refrigerant to be moved into the cylinder bore from the outside, the flow path is in communication with the swash chamber At least one inlet formed therein, and a drive shaft spaced apart from the inlet to form a pair of outlets in opposite directions; The drive shaft is rotatably installed in the shaft support hole and a plurality of cylinder bores are formed at both sides of the swash plate chamber, and the shaft sucked into the cylinder bore sequentially during the rotation of the drive shaft. A front and rear cylinder block having a suction passage communicating the support hole and each cylinder bore; A plurality of pistons mounted on an outer circumference of the swash plate and reciprocating in the cylinder bore in conjunction with a rotational movement of the swash plate; Front and rear housings coupled to both sides of the front and rear cylinder blocks and having discharge chambers formed therein; A compressor comprising a valve unit interposed between the front and rear cylinder blocks and the front and rear housings, wherein the head of the piston is provided with a slot for returning residual gas in the cylinder bore to the swash plate chamber. It is characterized by being formed.

Compressor, drive shaft, flow path, residual gas, refrigerant, swash chamber, piston, slot

Description

Compressor

1 is a cross-sectional view showing a general compressor.

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

3 is an exploded perspective view showing a compressor according to the present invention.

4 is a sectional view showing a compressor according to the present invention;

5 is a perspective view showing a state in which the drive shaft and the swash plate are disassembled in the compressor according to the present invention.

Figure 6 is a perspective view showing the structure of the piston in the compressor according to the present invention.

Figure 7 is an enlarged cross-sectional view showing the main portion of the state immediately after the completion of the compression of the piston in the compressor according to the present invention

Description of the Related Art [0002]

100: compressor 110: front housing

111,121: discharge chamber 112,122: fixing hole

113,123: bolt fastener 118: communication path

120: rear housing 130: front cylinder block

131, 141: cylinder bore 132, 142: suction passage

133,143: shaft support hole 134,144: discharge passage

135,145: Muffler 136: Judge Room

140: rear cylinder block 146: suction port

147: discharge port 150: drive shaft

151: Euro 152: entrance

153: exit 160: swash plate

161: hub 165: shoe

170: piston 171: head

171a: slot 172: bridge

173: Spoke Pocket Boss 174: Spoke Pocket

180: thrust bearing 190: valve unit

191: valve plate 191a: refrigerant discharge hole

191b: communication path 192: discharge lead valve

192a: valve plate 193: fixing pin

200: bolts

The present invention relates to a compressor, and more particularly, in a structure in which refrigerant is sucked into a cylinder bore through a hollow drive shaft, the high pressure and high temperature gas remaining in the cylinder bore immediately after the compression of the piston is returned to the swash chamber to be sucked from the swash chamber. The present invention relates to a compressor capable of improving the performance of the compressor by preventing the cylinder bore from overheating due to the residual gas by lowering the temperature by mixing with the refrigerant.

In general, a compressor for automobiles sucks refrigerant gas discharged after evaporation is completed from an evaporator, converts the refrigerant gas into a refrigerant gas in a high temperature and high pressure state that is easily liquefied, and discharges the refrigerant gas.

There are various kinds of such compressors, such as a swash plate type compressor in which a piston reciprocates by the rotation of an inclined swash plate, a scroll compressor compressed by a rotational motion of two scrolls, and a rotary compressor compressed by a rotary vane. .

Among these, the reciprocating compressor that compresses the refrigerant according to the reciprocating motion of the piston includes crank type and wobble plate type in addition to the swash plate type compressor, and the swash plate type compressor also has a fixed capacity swash plate type compressor and a variable capacity type according to the use. And swash plate compressors.

1 and 2 is a view showing a conventional fixed-capacity swash plate type compressor, briefly described with reference to the following.

As shown, the swash plate compressor 1 is coupled to the front housing 10, the front cylinder block 20 is built, the rear housing is coupled to the front housing 10 and the rear cylinder block 20a ( 10a).

Inside the front and rear housings 10 and 10a, the discharge chamber 12 and the suction are respectively provided inside and outside of the partition wall 13 in correspondence with the refrigerant discharge hole and the refrigerant suction hole of the valve plate 61 to be described below. The yarn 11 is formed.

Here, the discharge chamber 12 is formed in the first discharge chamber 12a formed inside the partition 13, and formed outside the partition 13 so as to be partitioned from the suction chamber 11 and the first discharge chamber 12a. ) And a second discharge chamber 12b communicating through the discharge hole 12c.

That is, when the refrigerant in the first discharge chamber 12a passes through the discharge hole 12c having the small diameter, the refrigerant is reduced and enlarged when moving to the second discharge chamber 12b. The pulsation pressure drops to reduce vibration and noise.

On the other hand, a plurality of bolted fastening holes 16 are formed in the circumferential direction of the suction chamber 11. Through the bolt fastening hole 16, the front and rear housings 10 and 10a are fastened / fixed to the mutual bolts 80 in a state where a plurality of components are assembled therein.

The front and rear cylinder blocks 20 and 20a are provided with a plurality of cylinder bores 21 therein, and the cylinder bores 21 corresponding to each other of the front and rear cylinder blocks 20 and 20a are provided. The pistons 50 are coupled to the linear reciprocating motion as well as the pistons 50 are coupled to the outer circumference of the swash plate 40 inclined to the drive shaft 30 via the shoe 45.

Accordingly, the pistons 50 reciprocate inside the cylinder bore 21 of the front and rear cylinder blocks 20 and 20a in conjunction with the swash plate 40 rotating together with the drive shaft 30.

The valve unit 60 is installed between the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a.

Here, the valve unit 60 is composed of a valve plate 61 having a refrigerant suction hole and a refrigerant discharge hole, and a suction lead valve 63 and a discharge lead valve 62 installed at both sides thereof.

The valve unit 60 is assembled between the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a, respectively, in which fixing pins are formed on both sides of the valve plate 61. 65 is assembled in a fixed position while being inserted into the fixing hole 15 formed on the opposite surface of the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a.

On the other hand, the front and rear cylinder block 20 (20) (so that the refrigerant supplied to the swash plate chamber 24 provided between the front and rear cylinder blocks 20, 20a can flow to each suction chamber 11 ( A plurality of suction passages 22 are formed in 20a, and the second discharge chamber 12b of the front and rear housings 10 and 10a is formed through the front and rear cylinder blocks 20 and 20a. It is communicated with each other by the connecting passage 23.

Therefore, the suction and compression of the refrigerant may be simultaneously performed in the bore 21 of the front and rear cylinder blocks 20 and 20a according to the reciprocating motion of the piston 50.

In addition, a shaft support hole 25 is formed at the center of the front and rear cylinder blocks 20 and 20a to support the drive shaft 30, and a needle roller bearing 26 is formed in the shaft support hole 25. It interposes and supports the said drive shaft 30 rotatably.

On the other hand, the upper portion of the outer side of the rear housing (10a) is supplied with the refrigerant transferred from the evaporator during the intake stroke of the piston 50 into the compressor (1), during the compression stroke of the piston 50 inside the compressor (1) The muffler 70 is formed to discharge the compressed refrigerant in the condenser.

Referring to the refrigerant circulation process of the compressor (1) configured as described above are as follows.

The refrigerant supplied from the evaporator is sucked into the suction part of the muffler 70 and then supplied to the swash plate chamber 24 between the front and rear cylinder blocks 20 and 20a through the refrigerant suction port 71. The refrigerant supplied to 24 flows into the suction chamber 11 of the front and rear housings 10 and 10a along the suction passage 22 formed in the front and rear cylinder blocks 20 and 20a. .

Thereafter, when the piston 50 is in the suction stroke, the suction lead valve 63 is opened by moving the piston 50 from the top dead center to the bottom dead center, wherein the refrigerant in the suction chamber 11 is a valve plate. It is sucked into the cylinder bore 21 through the refrigerant suction hole of the.

In the compression stroke of the piston 50, the refrigerant inside the cylinder bore 21 is compressed by the piston 50 moving from the bottom dead center to the top dead center. At this time, the discharge lead valve 62 is opened. The refrigerant flows to the first discharge chamber 12a of the front and rear housings 10 and 10a through the refrigerant discharge hole of the valve plate.

Subsequently, the refrigerant flowing into the first discharge chamber 12a is discharged to the discharge portion of the muffler 70 through the refrigerant discharge port 72 of the muffler 70 through the second discharge chamber 12b and then to the condenser. It will be fluid.

Meanwhile, the refrigerant compressed in the cylinder bore 21 of the front cylinder block 20 is discharged to the first discharge chamber 12a of the front housing 10 and then flows to the second discharge chamber 12b. Along the connecting passage 23 formed in the front and rear cylinder blocks 20 and 20a, the second discharge chamber 12b of the rear housing 10a flows to the refrigerant discharge port 72 together with the refrigerant therein. Through the discharge portion of the muffler 70 is discharged.

However, the above-described conventional compressor 1 has a loss due to the suction resistance caused by the complicated refrigerant passage inside, a loss due to the elastic resistance of the suction lead valve 63 when the valve unit 60 is opened and closed. There was a problem that the suction volume efficiency of the refrigerant is reduced.

On the other hand, a technique for reducing the loss caused by the elastic resistance of the suction lead valve 63 is disclosed in Korean Patent Publication No. 2003-47729 (name: lubrication structure in a fixed capacity piston compressor). That is, the above technology applies a suction shaft integrated suction rotary valve without a suction lead valve, and allows the refrigerant to directly enter the cylinder bore from the rear of the driving shaft through the inside of the driving shaft in order to reduce the loss caused by the suction resistance. will be.

In the case of the compressors, oil is mixed in the refrigerant for lubrication of the driving unit (swash plate, shoe, piston, etc.) and the friction unit inside the compressor to circulate the air conditioning system.

In addition, in the domestic patent application No. 2005-74186 filed by the applicant of the present invention, the cylinder bore formed in the cylinder block the refrigerant sucked into the compressor inside the drive shaft that is inclinedly coupled to the swash plate rotating in the swash plate chamber inside the compressor. It has been disclosed a compressor having a structure in which a flow path is formed so as to move to a side, and an inlet and an outlet are spaced apart from both sides of the flow path.

Here, the inlet of the flow passage is formed through one side of the hub and the drive shaft of the swash plate, or formed in opposite directions on both sides of the drive shaft. In the latter case, one inlet is formed at a position spaced apart from each other so as not to face the other inlet.

In addition, the outlet of the flow path is formed so as to communicate with the suction passage of each cylinder bore, the cylinder bore provided on both sides of the swash plate chamber during rotation of the drive shaft is formed on both sides of the drive shaft in opposite directions to each other at the same time so as to suck the refrigerant It is.

However, in the above prior arts, the compressed high temperature and high pressure immediately after the completion of the compression of the piston, that is, immediately after the piston moves past the bottom dead center to the highest top dead center and maximally compresses the refrigerant sucked into the cylinder bore of the cylinder block. By remaining in the gap between the valve unit and the cylinder bore interposed between the cylinder block and the housing without completely discharging the refrigerant, the cylinder bore may overheat causing thermal deformation. There was a problem of deteriorating the performance of the compressor, such as the suction is not made smoothly.

Accordingly, the present invention has been made to solve the above-described problems, and in the structure in which the refrigerant is sucked into the cylinder bore through the hollow drive shaft, the high-pressure high temperature gas remaining in the cylinder bore immediately after the compression of the piston is returned to the swash chamber. The purpose of the present invention is to provide a compressor that can improve the performance of the compressor by preventing the cylinder bore from overheating due to the residual gas by lowering the temperature by mixing with the refrigerant sucked from the swash plate chamber.

The present invention for achieving the above object is a swash plate rotating in the swash plate chamber inside the compressor is inclined, the flow path is formed inside the refrigerant to be moved into the cylinder bore from the outside, the swash plate At least one inlet formed in communication with the seal, and a drive shaft spaced apart from the inlet to form a pair of outlets in opposite directions;

The drive shaft is rotatably installed in the shaft support hole and a plurality of cylinder bores are formed at both sides of the swash plate chamber, and the shaft sucked into the cylinder bore sequentially during the rotation of the drive shaft. A front and rear cylinder block having a suction passage communicating the support hole and each cylinder bore;

A plurality of pistons mounted on an outer circumference of the swash plate and reciprocating in the cylinder bore in conjunction with a rotational movement of the swash plate;

Front and rear housings coupled to both sides of the front and rear cylinder blocks and having discharge chambers formed therein; In the compressor comprising a valve unit interposed between the front, rear cylinder block and the front, rear housing,

The head of the piston is formed with slots for returning the residual gas in the cylinder bore to the swash plate chamber, respectively.

The slot is characterized in that the portion is in communication with the suction passage and the swash plate chamber when the piston reaches the top dead center where the compression is completed after passing through the bottom dead center.

In addition, in the present invention, the inlet of the flow path is formed in the opposite direction to each other through the both sides of the hub and the drive shaft of the swash plate to communicate with the swash plate chamber, the outlet is to communicate with the suction passage of the cylinder block Characterized in that formed.

Further, in the present invention, the valve unit is a valve plate formed with a plurality of refrigerant discharge holes to communicate with each of the cylinder bore and the discharge chamber of the front and rear housings, and is provided on one side of the valve plate to open and close the discharge hole It characterized in that the discharge lead valve made of.

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.

Figure 3 is an exploded perspective view showing a compressor according to the present invention, Figure 4 is a cross-sectional view showing a compressor according to the present invention, Figure 5 is a perspective view showing the disassembled drive shaft and the swash plate in the compressor according to the present invention, Figure 6 Is a front view showing the structure of the rear cylinder block in the compressor according to the present invention, Figure 7 is an enlarged cross-sectional view showing the structure of the rear cylinder block and the head of the piston when the piston in the bottom dead center position in the compressor according to the present invention.

The present invention employs a structure of a compressor capable of allowing the refrigerant supplied to the swash plate chamber to be directly sucked into the cylinder bore through the hollow drive shaft.

According to the compressor having such a structure, a flow path is formed inside the drive shaft and the refrigerant supplied to the swash chamber is directly sucked into the cylinder bore through the flow path according to the rotation of the drive shaft, thereby uniforming the cylinder bore on both sides of the swash chamber. Not only the distribution of the refrigerant is made but also the flow of the refrigerant to the drive unit, such as the swash plate and the drive shaft in the swash plate chamber has the advantage that the lubrication performance by the oil can be improved.

The present invention adopts a structure of such a compressor, by adopting a structure for returning the high temperature and high pressure gas remaining in the cylinder bore immediately after the completion of the compression of the piston to the swash plate chamber, and the smooth suction of the refrigerant during the refrigerant intake process, It is to improve the performance of the compressor by preventing overheating.

That is, the compressor according to the present invention, as shown in the drawing, the drive shaft 150 and the drive shaft 150 is coupled to the swash plate 160 to rotate in the swash plate chamber 136 in the compressor 100 inclined; The front and rear cylinder blocks 130 and 140 rotatably installed in the shaft support holes 133 and 143, and are mounted on the outer circumference of the swash plate 160 via a shoe 165 and rotate the swash plate 160. A plurality of pistons 170 reciprocating inside the cylinder bores 131 and 141 formed on both sides of the swash plate chamber 136 of the front and rear cylinder blocks 130 and 140 in conjunction with the front and rear cylinder blocks; The front and rear housings 110 and 120 coupled to both sides of the blocks 130 and 140 and the discharge chambers 111 and 121 are formed therein, and the front and rear cylinder blocks 130 and 140. It is configured to include a valve unit 190 interposed between the front and rear housings 110 and 120, respectively.

The front and rear housings 110 and 120 are formed with a plurality of bolt fastening holes 113 and 123 at edges of the inside, and the front and rear housings through the bolt fastening holes 113 and 123. 110 and 120 are fastened / fixed to the mutual bolts 200 in the state in which the above components are assembled. Of course, the front and rear cylinder blocks 130, 140 and the valve unit 190 is formed with bolt fastening holes 138, 148, 194 so that the bolt 200 can pass through.

Both sides of the drive shaft 150 are rotatably installed in the shaft support holes 133 and 143 of the front and rear cylinder blocks 130 and 140, and one end thereof penetrates the center of the front housing 110. It extends and is engaged with the electromagnetic clutch (not shown).

On the other hand, since the swash plate 160 is moved forward and backward while the swash plate 160 is rotated in an inclined state while the compressor 100 is driven, the swash plate 160 flows from side to side by an axial load so that the swash plate 160 is deformed. Or the driving shaft 150 may be deformed, and in order to prevent this, generally, a thrust bearing 180 is interposed between both ends of the swash plate 160 and the front and rear cylinder blocks 130 and 140. have.

The swash plate 160 rotating in the swash plate chamber 136 is inclinedly coupled to the drive shaft 150, and the suction refrigerant sucked into the swash plate chamber 136 through the suction port 146 from the outside is swash plate. A flow path 151 is formed to communicate the swash plate chamber 136 and the cylinder bores 131 and 141 so as to move through the 160 to the cylinder bores 131 and 141.

In the flow path 151, an inlet 152 serving as a refrigerant suction passage for sucking the refrigerant and an outlet 153 for discharging the refrigerant are formed at positions spaced apart from each other. The inlet 152 is formed to communicate with the swash plate chamber 136, the outlet 153 is formed to communicate with each of the suction passage 132, 142 of the front, rear cylinder block 130, 140. do.

Here, the inlet 152 of the flow path 151 is formed by vertically penetrating one side of the hub 161 and the drive shaft 150 of the swash plate 160. Only one inlet 152 of the flow path 151 may be formed on one side of the driving shaft 150, or two may be formed on both sides thereof in opposite directions.

The outlet 153 of the flow path 151 is formed in opposite directions on both sides of the drive shaft 151 while being spaced apart from the inlet 152 of the flow path 151 so that the swash plate chamber when the drive shaft 150 rotates ( Refrigerant may be sucked into the cylinder bores 131 and 141 provided at both sides of the 136 at the same time.

That is, since the swash plate 160 is formed to be inclined, the piston 170 disposed in opposite directions among the plurality of pistons 170 coupled to the outer circumference of the swash plate 160 performs the same suction or compression stroke. Both outlets 153 of the flow path 151 must be formed in opposite directions so that the refrigerant can be sucked into the cylinder bores 131 and 141 provided on both sides of the swash plate chamber 136 at the same time.

Of course, the direction of each outlet 153 of the flow path 151 formed in the drive shaft 150 may vary depending on the design purpose such as the number of the piston 170.

In addition, the front and rear cylinder blocks 130 and 140 may have a plurality of cylinder bores 131 and 141 respectively formed at both sides of the swash plate chamber 136, and may support the driving shaft 150 at the center thereof. Axial support hole 133, 143 is formed to be.

In addition, the front and rear cylinder blocks (130, 140), the refrigerant sucked into the flow path 151 of the drive shaft 150 in the swash plate chamber 136, each cylinder bore (sequential) during rotation of the drive shaft 150 ( Suction passages 132 and 142 communicating with the shaft support holes 133 and 143 and the respective cylinder bores 131 and 141 are formed to be sucked into the 131 and 141.

Meanwhile, as shown in FIG. 6, the piston 170 has a pair of heads 171 on both sides of the bridge 172, and the heads 171 are disposed at the front and rear sides facing each other. It is inserted into the cylinder bores 131 and 141 to reciprocate in a sliding manner. In addition, on both sides of the central cutout cut in the lower portion of the bridge 172, the shoe pocket bosses 173 protrude from each other in the axial direction, and the hemispherical shoe pockets 174 are formed on the open surfaces of the shoe pocket bosses 173, respectively. This is molded and the shoe 165 is slidably seated there.

However, the piston 170 is not completely in contact with the end surface corresponding to the compression surface of the cylinder bores 131 and 141 due to the dimensional tolerances, whereby the valve unit 190 and the cylinder bore 131 will be described later. A constant gap G is formed between the 141s (see FIG. 7).

Due to the presence of the gap G, when the piston 170 reaches the top dead center where the suction of the refrigerant passes through the bottom dead center of starting the refrigerant suction process and reaches the top dead center where the compression is completed, the refrigerant of the high temperature and high pressure is compressed. The gas is not completely discharged through the discharge chamber and remains in the gap G. When the high-temperature, high-pressure refrigerant gas is left in the gap G, the cylinder blocks 131 and 141 are overheated, which causes a problem of deteriorating the performance of the compressor as a whole.

Therefore, in order to solve this problem, slots 171a having a predetermined length and depth are respectively formed in both heads 171 of the piston 170.

The slot 171a is formed at the site side in contact with the surfaces of the cylinder bores 131 and 141, and the head of the piston 170 proximate to the shoe pocket 174 for mounting the shoe 165. 171) It is formed to a certain distance from each end surface. In particular, the slot 171a is partially in the suction passages 132 and 142 and the swash plate chamber 136 when the piston 170 reaches the top dead center where the compression is completed after passing through the bottom dead center. It is formed to communicate with. Herein, the depth of the slot 171a may be in communication with the suction passages 132 and 142 when the piston 170 reaches the highest top dead center position.

According to this structure, as shown in FIG. 7, when the piston is at the top dead center, the high temperature and high pressure refrigerant gas remaining in the gap G passes through the suction passage 132 to the slot of the piston 170. It flows to the swash plate chamber 136 through 171a, and the piston is mixed with the relatively low temperature low pressure refrigerant sucked from the swash plate chamber 136 during the suction process of the refrigerant moving from the top dead center to the bottom dead center. The temperature will be lowered. As a result, the suction of the refrigerant and the overheating of the cylinder bore 131 can be prevented, thereby greatly improving the performance of the compressor as a whole.

In addition, the outer surface of one of the front and rear cylinder block 130, 140, the suction port 146 in communication with the swash plate chamber 136 to supply an external refrigerant to the swash plate chamber 136, and Discharge ports 147 communicating with the discharge chambers 111 and 121 are formed to discharge the refrigerant in the discharge chambers 111 and 121 of the front and rear housings 110 and 120 to the outside.

Accordingly, the discharge passage 134 connecting the discharge chambers 111 and 121 and the discharge port 147 of the front and rear housings 110 and 120 to the front and rear cylinder blocks 130 and 140. At this time, the outer surface of the cylinder block 130, 140 is formed with a muffler 135, 145 to expand the discharge passage 134 to reduce the pulsation pressure of the discharge refrigerant to reduce the noise do.

In addition, the valve unit 190 has a plurality of refrigerant discharge holes 191a to communicate the cylinder bores 131 and 141 with the discharge chambers 111 and 121 of the front and rear housings 110 and 120. Is formed on the valve plate 191 and the discharge lead valve 192 which is installed at one side of the valve plate 191 to open and close the refrigerant discharge hole 191a.

That is, the discharge lead valve 192 is installed in the discharge chambers 111 and 121 of the front and rear housings 110 and 120 on the basis of the valve plate 191 to compress the stroke of the piston 170. The valve plate 192a is elastically deformed to open the refrigerant discharge hole 191a and to close the refrigerant discharge hole 191a when the suction stroke is performed.

In addition, the valve plate 191 has refrigerant in the discharge chambers 111 and 121 of the front and rear housings 110 and 120 discharge passages 134 of the front and rear cylinder blocks 130 and 140. A communication path 191b is formed to communicate the discharge chambers 111 and 121 with the discharge passages 134 and 144 so as to be discharged to the discharge port 147 via the 144.

Meanwhile, the valve unit 190 has fixing pins 193 provided on both sides of the valve plate 191 facing the front and rear housings 110 and 120 and the front and rear cylinder blocks 130 and 140. It is coupled and fixed while being inserted into the fixing holes 112 and 122 formed on the surface.

As described above, in the compressor 100 according to the present invention, when the driving shaft 150 selectively receives power from an electronic clutch (not shown), the swash plate 160 rotates, and the swash plate ( The plurality of pistons 170 linked to the rotational movement of 160 repeats the action of sucking and compressing the refrigerant while reciprocating inside the cylinder bores 131 and 141 of the front and rear cylinder blocks 130 and 140. It will be done.

That is, in the suction stroke of the piston 170, an external refrigerant is supplied into the swash plate chamber 136 through the suction port 146, and then the inlet 152 and the auxiliary inlet of the flow path 151 of the drive shaft 150 are provided. It is sucked directly into the cylinder bores 131 and 141 through 154.

In the compression stroke of the piston 170, after the refrigerant sucked into the cylinder bores 131 and 141 is compressed by the piston 170, the discharge chamber 111 of the front and rear housings 110 and 120 is compressed. It is discharged to the 121 is discharged to the discharge port 147 through the discharge passage 134, 144 and the muffler 135, 145 of the front and rear cylinder blocks 130, 140.

As described above, the present invention forms a flow path 151 inside the hollow drive shaft 150 to supply the refrigerant sucked into the swash plate chamber 136 to the cylinder bores 131 and 141 through the flow path 151. The high pressure high temperature gas remaining in the cylinder bore immediately after the compression of the piston is applied to the swash chamber by applying a structure in which the slot 171a is formed in the piston 170 of the fixed displacement swash plate type compressor of the drive shaft-integrated suction rotary valve type that moves to By returning to improve the performance of the compressor during the next refrigerant suction process, it can be applied in the same method and configuration to various types of compressors such as the fixed capacity swash plate compressor as well as the electric compressor, the same effect can be obtained It is.

According to the present invention described above, in the structure in which the refrigerant is sucked into the cylinder bore through the hollow drive shaft, the high-pressure hot gas remaining in the cylinder bore immediately after the compression of the piston is returned to the swash chamber to be mixed with the refrigerant sucked from the swash chamber. Therefore, by lowering the temperature, the cylinder bore can be prevented from being overheated due to the residual gas, thereby greatly improving the performance of the compressor.

Claims (4)

The swash plate 160 rotating in the swash plate chamber 136 inside the compressor 100 is inclinedly coupled therein, and the flow path allows the refrigerant sucked into the compressor 100 from the outside to move to the cylinder bores 131 and 141. 151 is formed, and at least one inlet 152 is formed in the flow path 151 to communicate with the swash plate chamber 136, and a pair of outlets 153 are spaced apart from the inlet 152. Drive shafts 150 formed in opposite directions to each other; The drive shaft 150 is rotatably installed in the shaft support holes 133 and 143, and a plurality of cylinder bores 131 and 141 are formed at both sides of the swash plate chamber 136 and the flow path of the drive shaft 150 is provided. The shaft support holes 133 and 143 and each cylinder bore 131 and 141 may be sucked into the cylinder bore 131 and 141 sequentially during the rotation of the drive shaft 150. Front and rear cylinder blocks 130 and 140 formed with suction passages 132 and 142 communicating therewith; A plurality of pistons (170) mounted on an outer circumference of the swash plate (160) via a shoe (165) and reciprocating in the cylinder bores (131, 141) in conjunction with a rotational movement of the swash plate (160); Front and rear housings 110 and 120 coupled to both sides of the front and rear cylinder blocks 130 and 140 and having discharge chambers 111 and 121 formed therein, respectively; In the compressor comprising a valve unit 190 interposed between the front, rear cylinder block 130, 140 and the front, rear housing 110, 120, respectively, In the head 171 of the piston 170, slots 171a for returning residual gas in the cylinder bores 131 and 141 to the swash plate chamber 136 are formed, respectively. The slot 171a is formed to communicate with the suction passages 132 and 142 and the swash plate chamber 136 when the piston 170 reaches the top dead center where the compression is completed after passing through the bottom dead center. Compressor, characterized in that. delete The method of claim 1, The inlet 152 of the flow path 151 penetrates both sides of the hub 161 of the swash plate 160 and the drive shaft 150 so as to communicate with the swash plate chamber 136, a pair is formed in the opposite direction to each other, The outlet (153) is characterized in that the compressor is formed to communicate with the suction passage (132) (142) of the front and rear cylinder block (130) (140). The method of claim 1, The valve unit 190 has a plurality of refrigerant discharge holes 191a to communicate with each of the cylinder bores 131 and 141 and the discharge chambers 111 and 121 of the front and rear housings 110 and 120. Compressor, characterized in that formed in the valve plate 191 and the discharge lead valve 192 is installed on one side of the valve plate 191 to open and close the discharge hole (191a).

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