KR101047693B1 - compressor - Google Patents

Abstract

The present invention relates to a compressor, in which a swash plate having a hub is rotated inclined to rotate in a swash chamber inside the compressor, and a flow path is formed therein so that refrigerant sucked into the compressor from the outside can move to a cylinder bore. A drive shaft having at least one inlet formed in communication with the swash plate chamber and having a pair of outlets at opposite positions to both sides of the inlet and the axial direction; 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 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 hub side of the swash plate is provided with a suction passage communicating with an inlet of the drive shaft, respectively. Is characterized in that the inclined in the rotational direction of the swash plate relative to the radial direction.

According to the compressor according to the present invention, by considering the rotational direction of the swash plate to form a smooth structure of the refrigerant suction on the swash plate hub, the suction resistance of the refrigerant sucked into the drive shaft, as well as the refrigerant suction to increase the refrigerant efficiency There is an effect to improve.

Compressor, swash plate, hub, inlet, euro.

Description

Compressor

1 is a cross-sectional view showing a fixed displacement compressor according to the prior art.

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

3 is a cross-sectional view showing a compressor according to the present invention.

Figure 4 is a perspective view showing a coupling state of the swash plate and the drive shaft according to the present invention.

Figure 5 is a schematic front view showing a coupling state of the swash plate and the drive shaft according to the present invention, Figures 5a to 5c is a view showing each embodiment different in the hub side inlet shape of the swash plate.

*** Explanation of symbols for the main parts of the drawing ***

10: compressor, 11, 11a: front and rear housing,

12: discharge chamber, 20, 20a: cylinder block,

21: cylinder bore, 22: suction passage,

24: slate chamber, 25: shaft supporter,

30: drive shaft, 31: flow path,

40: swashpan, 41: hub,

42: inlet, 43: outlet,

50: piston, 60: valve unit,

70: Muffler.

The present invention relates to a compressor. More specifically, in a structure in which refrigerant is sucked into a cylinder bore through a hollow drive shaft, the refrigerant suction is smoothly formed on the swash plate hub side in consideration of the rotational direction of the swash plate. The present invention relates to a compressor that can reduce the suction resistance of a refrigerant sucked into the furnace, and improve the refrigerant efficiency by increasing the refrigerant suction.

In general, a compressor used in an automobile air conditioner has a function of sucking the vaporized heat exchange medium in the evaporator, compressing the sucked heat exchange medium, and pumping the compressed heat exchange medium to continuously circulate the refrigerant. To make it possible.

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 type compressor compressed by two scroll rotary motions, and a rotary type 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 and wobble plate type, in addition to the swash plate compressor. Type compressors and the like.

1 and 2 illustrate a conventional fixed displacement swash plate type compressor 100, a front housing 110 in which a front cylinder block 120 is incorporated, and a rear cylinder block coupled to the front housing 110. It comprises a rear housing (110a) is built in (120a).

Inside the front and rear housings 110 and 110a, the discharge chamber 112 and the suction chamber, respectively, inside and outside the partition 113 in correspondence with the refrigerant discharge hole and the refrigerant suction hole of the valve plate 161 to be described below. 111 is formed.

Here, the discharge chamber 112 is formed in the first discharge chamber (112a) formed inside the partition wall 113, the outer side of the partition wall 113 is partitioned from the suction chamber 111 and the first discharge chamber (112a) ) And a second discharge chamber 112b communicating through the discharge hole 112c. That is, when the refrigerant in the first discharge chamber 112a passes through the discharge hole 112c having the small diameter, the refrigerant is reduced and enlarged when moving to the second discharge chamber 112b. The pulsation pressure drops to reduce vibration and noise.

On the other hand, a plurality of bolted fastening holes 116 are formed in the circumferential direction of the suction chamber 111. Through the bolt fastening hole 116, the front and rear housings 110 and 110a are fastened and fixed to the mutual bolt 180 in a state where a plurality of components are assembled therein.

In addition, the front and rear cylinder blocks 120 and 120a are provided with a plurality of cylinder bores 121 therein, and the piston bores 121 corresponding to each other of the front and rear cylinder blocks 120 and 120a are provided with a piston ( In addition to 150 being coupled to reciprocate linearly, the piston 150 is coupled via the shoe 145 on the outer periphery of the swash plate 140 inclined to the drive shaft 130.

Accordingly, the piston 150 reciprocates inside the cylinder bore 121 of the front and rear cylinder blocks 120 and 120a in conjunction with the swash plate 140 that rotates together with the drive shaft 130.

The valve unit 160 is installed between the front and rear housings 110 and 110a and the front and rear cylinder blocks 120 and 120a. Here, the valve unit 160 is composed of a valve plate 161 having a refrigerant suction hole and a refrigerant discharge hole, and a suction lead valve 163 and a discharge lead valve 162 installed at both sides thereof.

The valve unit 160 is assembled between the front and rear housings 110 and 110a and the front and rear cylinder blocks 120 and 120a, respectively, in which fixing pins 165 are formed on both sides of the valve plate 161. ) Is assembled in a fixed position while being inserted into the fixing holes 115 formed on the opposite surfaces of the front and rear housings 110 and 110a and the front and rear cylinder blocks 120 and 120a.

On the other hand, the front and rear cylinder blocks (120, 120a) so that the refrigerant supplied to the swash plate chamber 124 provided between the front and rear cylinder blocks (120, 120a) can flow to each of the suction chamber (111). A plurality of suction passages 122 are formed therein, and the second discharge chamber 112b of the front and rear housings 110 and 110a passes through the front and rear cylinder blocks 120 and 120a. ) Are communicated with each other.

Therefore, the suction and compression of the refrigerant may be simultaneously performed in the cylinder bores 121 of the front and rear cylinder blocks 120 and 120a according to the reciprocating motion of the piston 150.

In addition, a shaft support hole 125 is formed at the center of the front and rear cylinder blocks 120 and 120a to support the driving shaft 130, and a needle roller bearing 126 is interposed in the shaft support hole 125. Thus, the drive shaft 130 is rotatably supported.

On the other hand, the upper portion of the outer side of the rear housing 110a supplies the refrigerant transferred from the evaporator during the suction stroke of the piston 150 into the compressor 100, and during the compression stroke of the piston 150 inside the compressor 100 The muffler 170 is formed to discharge the compressed refrigerant in the condenser.

Referring to the refrigerant circulation process of the compressor 100 configured as described above are as follows.

The refrigerant supplied from the evaporator is sucked into the suction part of the muffler 170 and then supplied to the swash plate chamber 124 between the front and rear cylinder blocks 120 and 120a through the refrigerant suction port 171, and the swash plate chamber The refrigerant supplied to 124 flows into the suction chamber 111 of the front and rear housings 110 and 110a along the suction passages 122 formed in the front and rear cylinder blocks 120 and 120a.

Thereafter, the suction lead valve 163 is opened during the suction stroke of the piston 150, wherein the refrigerant in the suction chamber 111 passes through the refrigerant suction hole in the valve plate 161. Is sucked into the interior. In addition, during the compression stroke of the piston 150, the refrigerant inside the cylinder bore 121 is compressed. In this case, the discharge lead valve 162 is opened and the refrigerant is discharged through the refrigerant discharge hole of the valve plate 161. The first discharge chamber 112a of the rear housings 110 and 110a flows. Subsequently, the refrigerant flowing into the first discharge chamber 112a is discharged to the discharge portion of the muffler 170 through the refrigerant discharge port 172 of the muffler 170 via the second discharge chamber 112b and then to a condenser. It will be fluid.

In addition, the refrigerant compressed in the cylinder bore 121 of the front cylinder block 120 is discharged to the first discharge chamber 112a of the front housing 110, and then flows to the second discharge chamber 112b. After flowing along the connecting passage 123 formed in the front and rear cylinder blocks (120, 120a) to the second discharge chamber (112b) of the rear housing (110a) and the refrigerant discharge port 172 together with the refrigerant therein. Through the discharge portion of the muffler 170 is discharged.

The conventional compressor 100 has a loss of refrigerant due to a loss of suction resistance caused by a complicated refrigerant flow path and loss due to elastic resistance of the suction lead valve 163 during the opening and closing operation of the valve unit 160. There was a problem that the suction volume efficiency is reduced.

On the other hand, a technique for reducing the loss caused by the elastic resistance of the suction lead valve is disclosed in Korean Patent Publication No. 2003-47729 (name: lubrication structure in a fixed displacement piston compressor). That is, the above technique applies a drive shaft integrated rotary suction valve without a suction lead valve and allows the refrigerant to directly enter the cylinder bore from the rear of the drive shaft through the inside of the drive 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 part inside the compressor to circulate the air conditioning system.

However, the above-described conventional techniques have not been able to secure the refrigerant suction passage sufficiently due to the enormous constraint in processing and increasing the size of the refrigerant suction passage behind the drive shaft, thereby increasing the refrigerant suction resistance.

In order to solve this problem, the applicant of the present invention has applied for a compressor that can allow the refrigerant supplied to the swash plate chamber to be directly sucked into the cylinder bore through the hollow drive shaft in accordance with the patent application No. 2005-74185.

According to the compressor having such a structure, by forming a flow path inside the drive shaft and allowing the refrigerant supplied to the swash chamber to be directly sucked into the cylinder bore through the flow path as the drive shaft rotates, thereby providing uniform refrigerant to each cylinder bore on both sides of the swash chamber. As well as the distribution is made, the flow of the refrigerant to the drive unit, such as the swash plate and the drive shaft in the swash plate chamber can be increased to improve the lubrication performance by the oil.

However, since the inlet formed in the hub of the swash plate, which is a rotating body, is formed perpendicular to the drive shaft, the suction resistance of the refrigerant sucked into the inside of the drive shaft is increased while the refrigerant is not sucked smoothly, thereby reducing the refrigerant efficiency. There was a problem. In particular, the problem that the refrigerant suction is sharply reduced at the rotational speed of more than 5000rpm.

The present invention has been made to solve the above problems, in the structure in which the refrigerant is sucked into the cylinder bore through the hollow drive shaft formed inlet formed on the swash plate hub side inclined in the rotational direction of the swash plate, the refrigerant of the inlet By forming the suction side surface into a smooth structure, the purpose of reducing the suction resistance of the refrigerant sucked into the drive shaft, as well as to increase the refrigerant suction to improve the refrigerant efficiency.

According to the compressor according to the present invention devised to achieve the object as described above, the swash plate having a hub to be rotated in the swash plate chamber inside the compressor is inclined, and the refrigerant sucked into the compressor from the outside into the cylinder bore A drive shaft having a flow path formed therein, wherein the flow path has at least one inlet communicating with the swash plate chamber, and a pair of outlets in opposite directions to the inlet and the axially spaced sides; 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 the cylinder bore in conjunction with a rotational movement of the swash plate; A front and rear housing 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 hub side of the swash plate communicates with the inlet of the drive shaft, respectively, and the rotation direction of the swash plate with respect to the radial direction. And a suction passage formed to be inclined to each other, the inlet and the suction passage of the driving shaft penetrate both sides of the driving shaft and the hub of the swash plate to communicate with the swash plate chamber, and a pair is formed in opposite directions to each other, and the outlet of the driving shaft is formed. Is characterized in that formed to communicate with the suction passage of the front, rear cylinder block.

The refrigerant suction side surface of the suction passage inlet may be formed in at least one of a chamfer shape and a shape having a curvature so as to smoothly flow the refrigerant to reduce the suction angle at which the refrigerant is sucked.

In addition, the suction passage is preferably formed such that its inner wall surface has a curvature.

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

3 is a cross-sectional view showing a compressor according to the present invention, Figure 4 is a perspective view showing a coupling state of the swash plate and the drive shaft according to the present invention, Figure 5 is a schematic front view showing a coupling state of the swash plate and the drive shaft according to the present invention. , (a) to (c) are views showing respective embodiments in which the hub side inlet shape of the swash plate is different.

In the compressor according to the present invention, as shown in FIG. 3, the swash plate 40 having the hub 41 is inclinedly coupled to rotate in the swash plate chamber 24 inside the compressor 10, and the compressor ( 10) a flow path 31 is formed to move the refrigerant sucked into the cylinder bore 21, and the flow path 31 is formed with one or more inlets 32 in communication with the swash plate chamber 24; A drive shaft 30 having a pair of outlets 33 formed in opposite directions from each other at positions spaced apart from both sides of the inlet 32 in the axial direction; The drive shaft 30 is rotatably installed in the shaft support hole 25, and a plurality of cylinder bores 21 are formed at both sides of the swash plate chamber 24, and sucked into the flow path 31 of the drive shaft 30. Front and rear cylinder blocks formed with a suction passage 22 for communicating the shaft support hole 25 and each cylinder bore 21 so that the refrigerant can be sucked into each cylinder bore 21 sequentially during the rotation of the drive shaft (30). (20, 20a); A plurality of pistons (50) mounted on an outer circumference of the swash plate (40) via a shoe (45) and reciprocating in the cylinder bore (21) in conjunction with a rotational movement of the swash plate (40); Front and rear housings 11 and 11a coupled to both sides of the front and rear cylinder blocks 20 and 20a and having discharge chambers 12 formed therein, respectively; Since the valve unit 60 interposed between the front and rear cylinder blocks 20 and 20a and the front and rear housings 11 and 11a, respectively, is the same as the prior art, a detailed description of the above configuration will be given below. It will be omitted.

Compressor 10 according to the present invention, as shown in Figures 3 to 5, the suction passage (each connected to the inlet 32 of the drive shaft 30 on the hub 41 side of the swash plate 40 ( 42 is formed through, and the suction passage 42 is formed to be inclined at a predetermined angle along the rotational direction of the swash plate 40 with respect to the radial direction from the center of the hub 41.

Here, the suction passage 42 is formed so that one end is in communication with the swash plate chamber 24, the other end is in communication with the inlet 31 of the drive shaft 30, the swash plate chamber 24 and the drive shaft 30 The flow path 31 is allowed to communicate.

In addition, as shown in (a) to (c) of Figure 5, the refrigerant suction side surface of the inlet of the suction passage 42, the chamfer shape or the flow of the refrigerant of a predetermined size so that the suction angle is reduced It is preferable to have at least one of the shapes which have predetermined curvature so that it may become smooth.

In addition, the suction passage 42 is preferably formed such that the inner wall surface has a predetermined curvature, as shown in FIG.

In other words, the refrigerant in the swash plate chamber 24 is sucked through the suction passage 42 in a direction opposite to the rotation of the swash plate 40 rotated by the drive shaft 30, and suction of the refrigerant at the inlet of the suction passage 42 is performed. As the side surface is formed to have a chamfer or curvature, or the inner wall surface of the suction passage 42 is formed to have a predetermined curvature, the suction resistance of the refrigerant is reduced and the refrigerant suction is smooth to obtain the effect of increasing the refrigerant efficiency. do.

Of course, it is also possible to vary the size of the chamfer or curvature of the refrigerant suction side surface according to the shape of the swash plate 40, the hub 41, the drive shaft 30, etc. configured in the compressor 10.

In the compressor 10 according to the present invention, when the drive shaft 30 selectively receives power from an electromagnetic clutch (not shown) rotates, the swash plate 40 coupled thereto rotates, and at this time, The plurality of pistons 50 linked to the rotational movement repeatedly perform the action of sucking and compressing the refrigerant while reciprocating the inside of the cylinder bore 21 of the cylinder blocks 20 and 20a.

In the inlet stroke of the piston 50, an external refrigerant is supplied into the swash plate chamber 24 through the refrigerant suction port 71, and then the inlet 42 formed to be inclined at the hub 41 side of the swash plate 40. ) Through the flow path 31 in the drive shaft 30 corresponding to the suction through the outlet 43 into the cylinder bore 21.

In addition, during the compression stroke of the piston 50, the refrigerant sucked into the cylinder bore 21 is compressed by the piston 50 and then discharged to the discharge chambers 12 of the front and rear housings 11 and 11a. The refrigerant is discharged to the refrigerant discharge port 72 through the discharge passage 44 and the muffler 70 of the front and rear cylinder blocks 20 and 20a.

As described above, the present invention forms a flow path 31 inside the hollow drive shaft 30 and moves the refrigerant sucked into the swash plate chamber 24 to the cylinder bore 21 through the flow path 31. In the configuration of a fixed displacement swash plate type compressor of the suction rotary valve type, the suction capacity of the suction valve 42 is formed to be inclined along the rotational direction of the swash plate 40 to facilitate the suction of the refrigerant. The same method and configuration can be applied to various types of compressors such as electric compressors as well as swash plate compressors, and the same effects can be obtained.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

According to the compressor according to the present invention as described above, in the structure in which the refrigerant is sucked into the cylinder bore through the hollow drive shaft, the suction passage formed on the side of the swash plate hub so as to communicate with the inlet of the drive shaft inclined in the rotational direction of the swash plate inclined And by forming the refrigerant suction side of the suction passage inlet in a smooth structure, it is possible to reduce the suction resistance of the refrigerant sucked into the drive shaft and to increase the refrigerant suction to improve the refrigerant efficiency. .

Claims (4)

The swash plate 40 having the hub 41 is inclined to rotate in the swash plate chamber 24 inside the compressor 10, and the refrigerant sucked into the compressor 10 from the outside moves to the cylinder bore 21. A flow path 31 is formed so that the flow path 31 is formed with at least one inlet 32 communicating with the swash plate chamber 24, and is spaced apart from both sides of the inlet 32 in the axial direction. A drive shaft 30 in which a pair of outlets 33 are formed in opposite directions; The drive shaft 30 is rotatably installed in the shaft support hole 25, and a plurality of cylinder bores 21 are formed at both sides of the swash plate chamber 24, and sucked into the flow path 31 of the drive shaft 30. Front and rear cylinder blocks formed with a suction passage 22 for communicating the shaft support hole 25 and each cylinder bore 21 so that the refrigerant can be sucked into each cylinder bore 21 sequentially during the rotation of the drive shaft (30). (20, 20a); A plurality of pistons (50) mounted on an outer circumference of the swash plate (40) via a shoe (45) and reciprocating in the cylinder bore (21) in conjunction with a rotational movement of the swash plate (40); Front and rear housings 11 and 11a coupled to both sides of the front and rear cylinder blocks 20 and 20a and having discharge chambers 12 formed therein; In the compressor comprising a valve unit (60) interposed between the front and rear cylinder blocks (20, 20a) and the front and rear housings (11, 11a), On the hub 41 side of the swash plate 40 is provided with a suction passage 42 in communication with each of the inlet 32 of the drive shaft 30 and inclined in the rotational direction of the swash plate 40 with respect to the radial direction, , The inlet 32 and the suction passage 42 of the drive shaft 30 pass through both sides of the hub 41 of the drive shaft 30 and the swash plate 40 to communicate with the swash plate chamber 24, respectively. Compressor, characterized in that the pair is formed in the opposite direction, the outlet (33) of the drive shaft (30) is in communication with the suction passage (22) of the front and rear cylinder block (20, 20a). The method of claim 1, The refrigerant suction side surface of the inlet of the suction passage (42), characterized in that at least one of the shape having a chamfer shape or a curvature so that the flow of the refrigerant to reduce the suction angle to the refrigerant is reduced. The method according to claim 1 or 2, The suction passage (42) is characterized in that the inner wall is formed so as to have a curvature. delete

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