KR20060053193A - Compressor - Google Patents

Abstract

The present invention is a compressor that sucks, compresses, and discharges refrigerant gas from an external refrigerant circuit, and includes a suction port and an oil communicating with the external refrigerant circuit on an outer circumferential surface of a cylinder block having a plurality of bores formed side by side. A suction muffler chamber having a reservoir, coupled to close the rear end of the cylinder block, and having a discharge chamber and a suction chamber therein for communicating the suction muffler chamber and the suction chamber upstream of the suction chamber; By having a suction chamber communication path, it is possible to effectively reduce the pressure pulsation and the resulting noise of the suction gas, improve the lubricity at the initial start, and improve the suction and compression efficiency without causing an increase in the overall length of the compressor as well as an overall volume increase. It provides a compressor that can.

Compressor, front housing, rear housing, cylinder block, oil storage, oil storage groove

Description

Compressor

1 is a cross-sectional view showing a cross section of a conventional compressor.

2 is a cross-sectional view showing a cross section of another conventional compressor.

3 is a sectional view showing a cross section of the compressor according to the first embodiment of the present invention;

4 is a sectional view showing a cross section of a compressor according to a second embodiment of the present invention;

5 shows a rear housing of the compressor according to the invention.

6 is a view showing a valve plate of the compressor according to the present invention;

7 is a cross-sectional view showing a cross section of a compressor according to a third embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

21 cylinder block 22 crankcase

23: front housing 24: valve plate

25: rear housing 26: discharge chamber

26a: discharge port 27: suction chamber

28: drive shaft 29, 30: radial bearing

31: shaft sealing device 32: rotating body

33: sleeve 33a: coupling hole

34: Saphan 35: Shu

36: guillotine piston 37: herb arm

38: guide pin 39: support arm

39a: hole

40: suction muffler chamber 41: suction chamber communication path

42: suction port 43: discharge port

44: inlet port 45: capacity control valve

46: communication hole 46a: protrusion

47: capacity control passage

50: oil reservoir 50a: oil reservoir groove

50b: slope

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor applied to a vehicle air conditioner, and more particularly, to a compressor having a single head piston and having a structure for reducing pressure pulsation of intake gas.

In general, the compressor is applied to the air conditioner of the vehicle, the noise is generated by the pressure pulsation of the intake gas or discharge gas, of which the noise transmitted to the interior of the vehicle through the evaporator, especially along the suction line In order to reduce the noise transmitted to the interior of the vehicle, it is necessary to reduce the pressure pulsation of the intake gas.

In particular, since the variable compressor is operated for a long time at a low flow rate and low lubrication state, the noise due to the pressure pulsation of the suction or discharge gas is increased as compared with the case of the fixed compressor, and thus a structure for reducing such noise is required.

Conventionally, in a variable compressor having a single head piston as a compressor applied to an air conditioner of a vehicle, a cylinder block (1) as shown in FIG. And suction and discharge muffler chambers 2, 4 on which the open sides face each other on the outer circumferential surface of the rear housing 3, and the edges of the open ends of both muffler chambers 2, 4 are joined to each other. By sealing by means of the present invention, it is possible to sufficiently secure the muffler space necessary to alleviate the pressure pulsation of the intake or discharge gas without causing an increase in the electric field of the compressor.

However, such a conventional muffler structure does not lead to an increase in the overall length of the compressor, but since a muffler space is provided on the outer circumferential surface of the housing, expansion of the housing is inevitable, and it is not possible to avoid increasing the total volume of the compressor, so that compact and light weight is strictly required. There is an inadequate problem with the muffler structure of a vehicle compressor.

The technique for solving the above-mentioned conventional problems is disclosed in Korean Patent Publication No. 2004-0021062 (name: compressor), which is filed by the applicant of the present invention, and with reference to FIG. It will be briefly described. As shown in the drawing, a suction muffler chamber 11 having a suction port 12 communicating with an external refrigerant circuit is formed on the outer circumferential surface of the cylinder block 10, and the rear housing 15 has a discharge chamber 16 therein. At least two suction chamber communication paths 18 having a suction chamber 17 and communicating the suction muffler chamber 11 and the suction chamber 17 upstream of the suction chamber 17 are formed.

In addition, a valve plate 19 is interposed between the cylinder block 10 and the rear housing 15, and the valve plate 19 opens the suction muffler chamber 11 and the suction communication path 18. At least one communicating hole 19a for communicating is formed.

Accordingly, the refrigerant gas introduced into the suction muffler chamber 11 through the suction port 12 from the external refrigerant circuit is sucked into the suction chamber 17 through the suction chamber communication path 18 formed in the rear housing 15. . The refrigerant gas sucked in this way is compressed according to the action of the single head piston 13 and the drive shaft 14, and then discharged to the discharge chamber 16 through the discharge port 19b and flows out to the external refrigerant circuit through the discharge port 16a. Will be.

Therefore, it is possible to effectively reduce the pressure pulsation and the resulting noise of the intake gas without causing an increase in the overall length of the compressor as well as an increase in the overall volume.

However, since the compressors do not have a structure capable of storing oil contained in the intake gas, the lubricity of the entire compressor may be degraded due to lack of oil during initial startup after the compressor is turned off, thereby resulting in noise. There was a problem.

That is, when the compressor is turned off, when the refrigerant inside the compressor is heated by outside heat or stagnated for a certain time, the oil is separated from the refrigerant and accumulated in a portion. As a result, when the compressor is started (ON), there is a problem in that the oil supply is insufficient in the suction chamber side, and noises are generated due to friction between the valve and the valve plate.

On the other hand, US Patent No. 5,062,773 forms a cylindrical separation chamber on the suction flow path to separate the oil from the refrigerant gas containing the oil, and then supply the separated oil to the swash plate chamber to provide lubrication of the drive shaft and the member supporting the same. It is to achieve.

However, even in such a structure, there is a problem such as noise caused by friction between the valve and the valve plate due to the above problem when the compressor is started after the compressor is turned off, that is, the oil is not supplied to the suction chamber side.

An object of the present invention for solving the above-described problems is to provide a compressor capable of reducing pressure pulsation and noise thereby without increasing the overall length of the compressor as well as increasing the overall volume of the compressor.

Another object of the present invention is to provide an compressor that can improve the lubricity of the compressor and further reduce the noise by forming an oil reservoir in the suction muffler chamber to allow the oil stored in the initial start-up of the compressor to flow into the suction chamber more smoothly. have.

In order to achieve the above object, the present invention includes a suction muffler chamber formed on the outer circumferential surface of the compressor main body to have a suction port and an oil storage unit for storing oil in communication with the external refrigerant circuit; A cylinder block having a plurality of bores formed side by side; A front housing coupled to the front end of the cylinder block to form a crank chamber; A drive shaft supported to rotate freely with respect to the cylinder block and the front housing; A piston which is linearly reciprocated in the bore of the cylinder block in association with the inclined plate element mounted to the drive shaft; And a rear housing coupled to the rear end of the cylinder block, having a discharge chamber and a suction chamber therein, and a suction chamber communication path communicating the suction muffler chamber and the suction chamber upstream of the suction chamber. It is characterized in that for supplying the oil stored in the oil storage unit at the start of the compressor to the suction chamber side via the suction chamber communication path.

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

3 is a cross-sectional view showing a cross section of a compressor according to a first embodiment of the present invention, FIG. 4 is a cross-sectional view showing a cross section of a compressor according to a second embodiment of the present invention, and FIG. 5 is a compressor according to the present invention. Figure 6 shows the rear housing of Figure 6 is a view showing the valve plate of the compressor according to the present invention.

Referring to the drawings, the front end of the cylinder block 21 having at least five bores installed side by side is closed by the front housing 23 forming the crank chamber 22, and the rear end of the cylinder block 21, the discharge chamber 26, It is closed by the rear housing 25 which provided the suction chamber 27 in the outer area. The valve plate 24 is interposed between the cylinder block 21 and the rear housing 25.

Here, the valve plate 24 is provided with a suction lead valve (not shown) and a discharge lead valve (not shown) to open and close the suction port 44 and the discharge port 43, respectively.

In addition, the shaft sealing device 31 is provided at the front housing 23 side of the drive shaft 28 supported by the radial housings 29 and 30 in the front housing 23 and the cylinder 21, respectively. It is installed. On the drive shaft 28 in the crank chamber 22, a rotating body 32 is fitted to fix the rotation of the drive shaft 28 to the swash plate 34. The rotating body 32 is supported on the inner side of the front housing 23 so as to be rotatable.

In addition, a sleeve 33 is fitted on the drive shaft 28 so as to be slidable.

Coupling holes 33a protrude from the left and right sides of the sleeve 33, and engagement holes of the swash plate 34 are fitted into the coupling holes 33a so as to allow an inclined movement of the swash plate 34.

A pair of hemispherical shoes 35 are in contact with each other on the slide surface of the swash plate 34, and the hemispherical shoes 35 are spherically coupled with the single head piston 36 inserted into each bore to form the single head piston 36. ) Is moored to the swash plate 34.

On the front side of the swash plate 34, a pair of hub arms 37 constituting the hinge mechanism extend over the top dead center position of the swash plate 34, and each hub arm 37 and the rotating body 32 penetrate them. The guide pin 38 to be fastened is fitted.

On the other hand, the rear side of the rotating body 32 is provided with a pair of support arms 39 constituting the hinge mechanism, the guide pin 38 is fitted into the hole (39a) provided through each support arm (39). Since the movement of the swash plate 34 is restricted by this, the hole 39a of the support arm 39 has its center inclination angle set so that the top position of the single head piston 36 is always stably maintained. have.

Further, the rotating body 32, the sleeve 33 and the swash plate 34 constitute the inclined plate element of the present invention.

Reference numeral 45 denotes a capacity control valve, which functions to appropriately adjust the capacity of the refrigerant gas in the crank chamber 22 connected by the capacity control passage 47.

In addition, a suction muffler chamber 40 having a suction port 42 communicating with an external refrigerant circuit is installed on an outer circumferential surface of the cylinder block 21, and the rear housing 25 is illustrated in FIG. 5. At least two suction chamber communication paths 41, for example, two suction chamber communication paths 41, which communicate with the suction muffler chamber 40 and the suction chamber 27, are provided on an upstream side of the suction chamber 27.

Preferably, the cross sectional area of each suction chamber communication path 41 is made smaller than the cross sectional area of the opening of the suction muffler chamber 40. Furthermore, it is preferable that each suction chamber communication path 41 has a direction perpendicular to the central axis of the suction chamber 27.

Thus, by forming at least two suction chamber communication paths 41 in the rear housing 25, the refrigerant gas flowing into the suction chamber 27 in the rear housing 25 from the suction muffler chamber 40 is sucked in the suction muffler chamber 40. The inflow rate is increased while passing through the suction chamber communication path 41 having a relatively reduced cross-sectional area than the opening of. Therefore, when the refrigerant gas flows into the suction chamber 27 at an increased speed, the refrigerant gas can be supplied to the entire suction chamber 27 quickly and evenly, so that the refrigerant gas is sucked into the crank chamber 22 from the suction chamber 27. And compression efficiency can be improved.

In addition, by forming at least two suction chamber communication paths 41 in the rear housing 25, the flow of refrigerant gas flowing into the suction chamber 27 from the suction muffler chamber 40 can be dispersed, thereby reducing the pressure drop amount of the refrigerant gas. This can be prevented from growing.

Between the cylinder block 21 and the rear housing 25, as shown in FIG. 6, the valve plate 24 may be interposed.

Furthermore, the valve plate 24 preferably has at least one communication hole 46 for communicating the suction muffler chamber 40 and the suction chamber communication path 41.

The communication hole 46 of the valve plate 24 is formed in the same shape as the suction chamber communication path 41 and the refrigerant gas passing through the communication hole 46 of the valve plate 24 is the suction chamber communication path 41. By smoothly passing through it can be smoothly introduced into the suction chamber 27 is preferred.

On the other hand, the suction port 42 formed in the suction muffler chamber 40 is in communication with the external refrigerant circuit, the suction port 42 is so far away from the suction chamber communication path 41 the front housing 23 ), For example, at least 20 mm or more toward the front housing 23 from the suction chamber communication passage 41.

In this way, the refrigerant gas introduced into the suction muffler chamber 40 from the external refrigerant circuit can be smoothly flowed into the suction chamber 27 of the rear housing 25 to prevent the pressure drop of the refrigerant gas. You can do it.

In addition, an oil reservoir 50 is formed in the suction muffler chamber 40 to store oil contained in the refrigerant gas introduced through the suction port 42.

That is, in the process of passing the refrigerant gas through the suction muffler chamber 40 at the start of the compressor, the oil contained in the refrigerant gas hits the inner wall surface of the suction muffler chamber 40 and flows down to the oil storage unit 50. To be stored in.

The oil stored in this way remains in the oil storage unit 50 when the compressor is OFF, and supplies oil to the suction chamber 27 in which oil is insufficient at the initial start of the compressor, and supplies the oil to the suction chamber 27 side. The formed oil forms an oil film on the valve plate 24 or the discharge / suction lead valve to reduce noise such as a contact sound during opening and closing of the valve (not shown). Meanwhile, some of the oil supplied to the suction chamber 27 is introduced into the crank chamber 22 to lubricate the sliding part, thereby improving the lubricity of the compressor at the initial start of the compressor.

As shown in FIG. 3, the first embodiment of the oil storage unit 50 includes a protrusion 46a at an outlet side of the suction muffler chamber 40 to store oil.

Here, the protrusion 46a is formed by making the communication hole 46 of the valve plate 24 smaller than the outlet side region of the suction muffler chamber 40.

Accordingly, the oil storage part 50 is formed at the lower portion of the suction muffler chamber 40 by the protrusion 46a, and oil contained in the refrigerant gas passing through the suction muffler chamber 40 is stored. In addition, the oil stored in the oil storage unit 50 is introduced into the suction chamber 27 along the suction refrigerant passing through the suction muffler chamber 40 when the compressor starts up.

In addition, when the oil storage unit 50 is configured by the protrusion 46a, the oil storage unit may be easily adjusted by adjusting the size of the communication hole 46 so that the protrusion 46a can easily adjust the height d. The size (height) of the 50 can also be easily adjusted.

Here, the height d of the protrusion 46a is such that the height d of the protrusion 46a may be introduced into the suction chamber 27 along with the refrigerant into which the oil stored in the oil storage unit 50 is sucked. Preferably, the height d of the protrusion 46a is set to about 5 mm.

On the other hand, the protrusion 46a may form an inclined surface in the oil storage unit 50 side so that oil stored in the oil storage unit 50 flows more smoothly into the suction chamber 27 side when the compressor is started. .

In addition, the second embodiment of the oil storage unit 50 may be configured by forming an oil storage groove 50a directly under the suction muffler chamber 40 of the cylinder block 21, as shown in FIG. .

At this time, the oil storage groove (50a) is formed with an upward inclined surface (50b) toward the suction chamber 27 side, the oil stored in the oil storage groove (50a) at the start of the compressor more smoothly toward the suction chamber 27 side. It is desirable to allow the inflow.

7 is a cross-sectional view of a compressor according to a third embodiment of the present invention. The suction muffler chamber 40 may be formed only at the cylinder block 21 side as shown in FIGS. 3 and 4, but FIG. It may be formed over the front housing 23 and the cylinder block 21 as shown in FIG.

As such, in the present invention, the suction muffler chamber 40 may be formed in various forms on the outer circumferential surface of the compressor main body, and thus the size of the oil storage unit 50 may be freely adjusted together with the suction muffler chamber 40. will be.

Hereinafter, the operation of the present invention having the above-described configuration will be described.

The refrigerant gas introduced into the suction muffler chamber 40 from the external refrigerant circuit through the suction port 42 passes through the suction chamber communication path 41 formed in the rear housing 25 to the suction chamber 27 in the rear housing 25. Inhalation will occur.

In this case, some of the oil contained in the refrigerant gas passing through the suction muffler chamber 40 is stored in the oil storage unit 50.

In this way, the refrigerant gas sucked into the suction chamber 27 is compressed in accordance with the action of the single head piston 36 and the drive shaft 28 and then discharged through the discharge port 43 to the discharge chamber 26 to discharge the discharge port 26a. Through the external refrigerant circuit.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, this is merely exemplary, and those skilled in the art may realize various modifications and other equivalent embodiments therefrom. I can understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention having the configuration as described above can effectively reduce the pressure pulsation and the resulting noise of the intake gas without increasing the overall length of the compressor, as well as the overall volume increase.

In addition, in the present invention, the refrigerant gas flowing into the suction chamber from the suction muffler chamber can be introduced into the suction chamber quickly and evenly, thereby improving the suction and compression efficiency of the refrigerant gas.

In addition, by forming an oil reservoir in the suction muffler chamber, the oil stored during the initial startup of the compressor flows more smoothly into the suction chamber, thereby improving lubricity at the initial startup of the compressor, thereby improving the lubrication of the valves and valve plates on the suction chamber side. Noise caused by friction is further reduced.

Claims (7)

A suction muffler chamber 40 formed on an outer circumferential surface of the compressor main body to have a suction port 42 communicating with an external refrigerant circuit and an oil storage part 50 storing oil; A cylinder block 21 having a plurality of bores formed side by side therein; A front housing 23 coupled to the front end of the cylinder block 21 to form a crank chamber 22; A drive shaft 28 supported to rotate freely with respect to the cylinder block 21 and the front housing 23; A piston (36) linearly reciprocating in the bore of the cylinder block (21) in association with the inclined plate element mounted to the drive shaft (28); And It is coupled to close the rear end of the cylinder block 21, has a discharge chamber 26 and the suction chamber 27 therein, the suction muffler chamber 40 and the upstream side of the suction chamber 27 A rear housing 25 having a suction chamber communication path 41 for communicating the suction chamber 27; And supplying oil stored in the oil storage unit (50) to the suction chamber (27) via the suction chamber communication path (41) at the start of the compressor. The method of claim 1, A valve plate 24 is interposed between the cylinder block 21 and the rear housing 25, and the valve plate 24 communicates the suction muffler chamber 40 and the suction chamber communication path 41. Compressor characterized in that it has a communication hole (46). The method of claim 2, The oil storage unit (50) is provided with a protrusion (46a) on the outlet side of the suction muffler chamber 40, characterized in that the compressor is made to store oil. The method of claim 3, wherein The projecting portion (46a) is characterized in that formed by forming the communication hole 46 of the valve plate 24 smaller than the outlet side region of the suction muffler chamber (40). The method of claim 3, wherein The height d of the protrusion 46a is formed at a height d enough to flow into the suction chamber 27 along with the refrigerant into which the oil stored in the oil storage unit 50 is sucked when the compressor starts up. Compressor, characterized in that. The method of claim 1, The oil storage unit 50 is characterized in that the oil storage groove (50a) formed in the lower portion of the suction muffler chamber (40) of the cylinder block (21). The method of claim 6, The oil storage groove (50a) is characterized in that the upward inclined surface (50b) is formed toward the suction chamber (27) side.

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