WO2003054391A1

WO2003054391A1 - Suction mechanism of rotary compressor

Info

Publication number: WO2003054391A1
Application number: PCT/KR2002/002386
Authority: WO
Original assignee: Lg Electronics Inc.
Priority date: 2001-12-20
Filing date: 2002-12-18
Publication date: 2003-07-03
Also published as: CN100385117C; CN1620554A; JP2005513339A; KR20030051086A

Abstract

Disclosed is a suction mechanism for a rotary compressor in which one suction pipe is connected to an inside of a compressor in an accumulator and the suction pipe supplies refrigerant to a first compressing unit and a second compressing unit, respectively, thereby reducing a fabricating process and a fabricating cost by applying a single type accumulator and reducing refrigerant leakage by connecting the compressor with one suction pipe.

Description

SUCTION MECHANISM OF ROTARY COMPRESSOR

TECHNICAL FIELD

The present invention relates to a rotary compressor and particularly, to a suction mechanism of a rotary compressor, capable of improving assembling performance and reducing the number of parts of the compressor by improving a suction structure.

BACKGROUND ART Generally, a hermetic compressor is classified into a rotary compressor, a reciprocating compressor and a scroll compressor according

to a method of compressing fluid.

The rotary compressor is one type of the compressor in which fluid is compressed while a rolling piston revolves and rotates inside the cylinder, and a twin type rotary compressor is used in case of a large compression volume. Figure 1 is a cross-sectional view showing a twin type rotary compressor in accordance with the conventional art.

The rotary compressor in accordance with the conventional art includes a hermetic vessel 108 to which the first suction pipe 102, second suction pipe 104 and discharge pipe 106 are respectively connected, a dπving unit 110 which is mounted at an upper portion of the hermetic housing 108, for generating a rotation force, a twin type compressing unit 112 which is mounted at an lower portion of the hermetic vessel 108, for compressing and discharging refrigerant which is sucked to the first and second suction pipes 102 and 104 by a rotation force generated in the driving unit 1 10 to the discharge pipe 106, and an accumulator 114 which is connected with the first and second suction pipes 102 and 104, for filtering foreign materials and liquid refrigerant in refrigerant supplied to the compressing unit 1 12.

The hermetic vessel 108 is formed in a cylindrical shape that an upper

cover 116 and lower cover 1 18 are hermetically assembled to each other. The first and second suction pipes 102 and 104 through which the refrigerant

which passes through the accumulator 114 is sucked to the compressing unit

1 12 are connected to a side portion of the hermetic vessel 108, and the

discharge pipe 106 for discharging compressed refrigerant is connected to

the upper portion thereof.

The driving unit 1 10 is fixedly disposed at an upper portion of the

hermetic vessel 108 and includes a stator 120 to which a power is supplied

from the outside, a rotor 122 which is positioned at a predetermined interval

from the stator 120 at an inner circumference of the stator 120 and rotates by

interacting with the stator 120 when a power is supplied to the stator 120, and

a rotation shaft 124 which is fixed to the center of the rotor 122 and rotates

together with the rotor 122, for transferring the rotation force to the

compressing unit 1 12.

The compressing unit 1 12 includes an upper bearing 126 and a lower

bearing 128 which are mounted at a lower portion of the hermetic vessel 108

at a predetermined interval to rotatably support the rotation shaft 124, a first

compressing unit 130 which is mounted on the lower surface of the upper

bearing 126 and is connected with the first suction pipe 102, for compressing the refrigerant, and a second compressing unit 132 which is divided from the first compressing unit 130 by a dividing plate 134, mounted on the upper surface of the lower bearing 128 and connected with the second suction pipe 104, for compressing the refrigerant. The first compressing unit 130 includes a first cylinder 140 which is mounted between the upper bearing 126 and dividing plate 134 and forms a first compressing chamber 136, and in which a first suction port 138 connected with the first suction pipe 102 is formed, a first rolling piston 144 which is rotably inserted on the outer circumferential surface of the first eccentric ring 142 eccentrically formed on the outer circumferential surface of the rotation shaft 124 and rotates while being abutted on the inner surface of the first compressing chamber 136, a vain (not shown) for dividing the first compressing chamber 136 into a high pressure portion and a lower pressure portion, and a first discharge valve 148 which is formed in the upper bearing 126 and is installed in the first discharge port 146 through which compressed fluid is discharged, for preventing inverse current of fluid which is discharged to the first discharge port 146.

And the second compressing unit 132 includes a second cylinder 154 which is fixed on the upper surfaces of the lower bearing 128 and dividing plate 134 to form a second compressing chamber 150, and in which a second suction port 152 which is connected with the second suction pipe 104 is formed, a second rolling piston 158 which is rotably inserted on the outer circumferential surface of the second eccentric ring 156 eccentπcally formed regularly on the rotation shaft 124, and rotates while being abutted on the inner surface of the second compressing chamber 150, a vain (not shown) for dividing the second compressing chamber 156 into the high pressure portion and a low pressure portion, and a second discharge valve 162 which is formed in the lower bearing 128, and is installed in the second discharge port 160 through which the compressed fluid is discharged, for preventing inverse current of the fluid discharged into the second discharge port 160.

The accumulator 114 contains a cylindrical hermetic space and a suction port 164 through which refrigerant is sucked is formed on the upper portion thereof, and a first discharge port 166 connected with the suction pipe 102 and a second discharge port 168 connected with the second suction pipe 104 are respectively formed at the lower portion thereof.

The operation of such twin type rotary compressor in accordance with the conventional art will be described as follows.

When a power is applied to the stator 120, the rotor 122 rotates by an interaction with the stator 120, and the rotation shaft 124 rotates together with the rotor 122.

Then, the refrigerant discharged to the first discharge port 166 of the accumulator 114 flows to the first compressing chamber 136 through the first suction pipe 102, and as the first rolling piston 144 rotates and revolves in the first compressing chamber 136 by rotation of the rotation shaft 124, the refrigerant is compressed and discharged through the first discharge port 146. At the same time, the refrigerant which is discharged into the second discharge port 168 of the accumulator 114 flows into the second compressing chamber 150 through the second suction pipe 104, as the second rolling piston 158 rotates and revolves in the second compressing chamber 150 by rotation of the rotation shaft 124, the refrigerant is compressed and discharged through the second discharge port 160.

The refrigerant discharged to the first and second discharge ports 146 and 160 is discharged to the outside through the discharge pipe 106 which is connected to the upper portion of the hermetic vessel 108.

However, in the twin type rotary compressor in accordance with the conventional art, since the first and second suction pipes are respectively connected to the accumulator to respectively suck the refrigerant to the first and second compressing units, the fabricating process and installation of the accumulator become complicated, fabricating cost increases and the conventional single type accumulator can not be applied, thus to degrade compatibility.

Also, since the first and second suction pipes are respectively connected with the hermetic vessel, the fabricating process becomes complicated and the cost is increased, and also the installation space is increased.

Also, as two suction pipes are installed, more leakage of the refrigerant can be generated and accordingly, the number of the parts for preventing

leakage is increased.

DESCRIPTION OF THE INVENTION

Therefore, an object of the present invention is to provide a suction mechanism of a rotary compressor, capable of reducing fabricating process and cost and improving compatibility of an accumulator by providing an improved structure in which a single type accumulator can be applied by sucking refrigerant to a main body of the twin type rotary compressor through one suction pipe in the accumulator. Also, the other object of the present invention is to provide a suction mechanism of a rotary compressor, capable of reducing leakage of refrigerant by connecting accumulator and compressor main body with a suction pipe, and reducing fabricating process and cost of the main body of the compressor.

DETAILED DESCRIPTION OF THE INVENTION

In order to achieve the above objects, there is provided a suction mechanism of a rotary compressor which includes a hermetic vessel to which a suction pipe and a discharge pipe are respectively connected, a driving unit for generating a rotation force, first and second compressing units for compressing refrigerant sucked to the suction pipe by the rotation force generated in the driving unit, and an accumulator which is connected with the suction pipe. A first suction port of the first compressing unit and the accumulator are connected to the suction pipe to supply refrigerant to the first compressing unit, and the diverging passage which is diverged from the first suction port is connected with a second suction port of the second compressing unit.

The first suction port is formed at a side of a first cylinder of the first compressing unit to directly connect the suction pipe which is connected with the first compressing chamber of the first compressing unit and the accumulator.

The diverging passage includes a first diverging passage which is formed at a side of the first suction port and a second diverging passage which is formed on a dividing plate which divides the first and second compressing units to connect the first diverging passage and the second suction port of the second compressing unit.

The second suction port is formed at a side of the second cylinder of the second compressing unit to be slanted at a predetermined angle in the upper direction so that the port is connected with the second diverging passage.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a cross-sectional view showing a rotary compressor in accordance with the conventional art;

Figure 2 is a cross-sectional view showing a rotary compressor in accordance with the present invention;

Figure 3 is a partially sectional view showing a compressing unit of the rotary compressor in accordance with an embodiment of the present invention; and

Figure 4 is a partially sectional view showing a compressing unit of the rotary compressor in accordance with a second embodiment of the present invention. MODE FOR CARRYING OUT THE PREFERRED EMBODIMENTS

The present invention will now be described with reference to accompanying drawings.

Figure 2 is a cross-sectional view showing a rotary compressor of the present invention.

With reference to Figure 2, the rotary compressor of the present invention includes a hermetic vessel 6 to which a suction pipe 2 and a discharge pipe 4 are respectively connected, a driving unit 8 which is mounted at an upper portion of the hermetic vessel 6, for generating a rotation force, a twin type compressing unit 10 for compressing refrigerant sucked to the suction pipe 2 by the rotation force generated in the driving unit 8, and an accumulator 12 which is connected with the suction pipe 2, for filtering foreign materials and liquid refrigerant in refrigerant supplied into the inside of the compressor. The hermetic vessel 6 is formed in a cylindrical shape so that the upper cover 14 and lower cover 16 are mounted to be sealed at the upper and lower portions, a suction pipe 2 through which refrigerant passed the accumulator 12 is sucked to the compressing unit 10 is connected to a side surface, and a discharge pipe 4 through which compressed fluid is discharged is connected on the upper surface.

The driving unit 8 includes a stator 18 which is fixed at the upper portion of the hermetic vessel 6 and to which a power is supplied from the outside, a rotor 20 which is positioned on the inner circumference of the stator 18 at a predetermined interval from the stator 18 and rotates by interacting with the stator 18 when the power is supplied to the stator 18, and a rotation shaft 22 which rotates together while being fixed at the center of the rotor 20, for transferring a rotation force to the compressing unit 10.

As shown in Figure 3, the compressing unit 10 in accordance with an embodiment of the present invention includes an upper bearing 24 and a lower bearing 26 which are respectively mounted at the lower portion of the hermetic vessel 6 at a predetermined interval to rotably support the rotation shaft 22, a first compressing unit 28 which is mounted on the lower surface of the upper bearing 24 and is connected with the suction pipe 2 to compress refrigerant, a second compressing unit 30 which is mounted on the upper surface of the lower bearing 26 and is connected with the suction pipe 2 to compress the refrigerant, and a dividing plate 32 for dividing between the first compressing unit 28 and the second compressing unit 30.

The first compressing unit 28 includes a first cylinder 38 which is fixed between the upper bearing 24 and the dividing plate 32 to form the first compressing chamber 34 and in which a first suction port 36 connected with the suction plate 2 is formed, a first rolling piston 42 which is rotatably inserted on the outer circumferential surface of the first eccentric ring 40 and which rotates while being abutted on the inner surface of the first compressing chamber 34, and a first discharge valve 46 which is installed in the first discharge port 44 through which compressed fluid is discharged being formed in the upper bearing 24, for preventing inverse current of fluid discharged through the first discharge port 44.

The second compressing unit 30 includes a second cylinder 58 which is fixed between the lower bearing 26 and dividing plate 32 to form the second compressing chamber 48 and in which a second suction port 56 connected with the diverging passage 50 which is diverged from the first suction port 36 is formed, a second rolling piston 62 which is rotatably inserted on the outer circumferential surface of the second eccentric ring 60 and which rotates while being abutted on the inner surface of the second compressing chamber 48, and a second discharge valve 66 which is installed in the second discharge port 64 through which compressed fluid is discharged being formed in the lower bearing 26, for preventing inverse current of the fluid discharged through the second discharge port 64.

The diverging passage 50 supplies the refrigerant flowed to the first suction port 36 to the second suction port 56 and includes a first diverging passage 52 which is formed at a side of the first suction port 36, and a second diverging passage 54 which is connected with the first diverging passage 52, and connected with the second suction port 56 by being penetrated at a side of the dividing plate 32.

Here, the second suction port 56 is formed to be slanted at a predetermined angle in the upward direction in the second compressing chamber 48 so that the port 56 is connected with the second diverging passage 54.

The accumulator 12 has a cylindrical hermetic vessel, a suction port 68 for sucking refrigerant is formed in the upper portion thereof, and a discharge port 70 which is connected with the suction pipe 2 is formed in the lower portion thereof. The operation of the twin type rotary compressor in accordance with an embodiment of the present invention with the above structure will be described as follows.

When a power is supplied to the driving unit 8, the rotor 20 rotates together with the rotation shaft 22 by interaction between the stator 18 and rotor 20. Then, refrigerant under the condition of gas generated by filtering liquid refrigerant and foreign materials while passing the accumulator 12 is flowed to the first suction port 36 through the suction pipe 2.

The refrigerant flowed to the first suction port 36 is supplied to the first compressing chamber 34, flowed to the second suction port 56 through the diverging passage 50 formed in the first suction port 36, and supplied to the second compressing chamber 48.

The refrigerant sucked to the first compressing chamber 34 is compressed by rotation and revolution of the first rolling piston 42 caused by rotation of the rotation shaft 22, and the compressed refrigerant is discharged through the first discharge port 44.

Then, the refrigerant sucked to the second compressing chamber 48 through the second suction port 56 is compressed by rotation and revolution of the second rolling piston 62 caused by rotation of the rotation shaft 22, and the compressed refrigerant is discharged through the second discharge port 64.

The refrigerant discharged to the first discharge port 44 and second discharge port 64 is discharged to the outside through the discharge pipe 4 which is connected to the hermetic vessel 6. As described above, the refrigerant passed the accumulator 12 flows to the first suction port 36 through a suction pipe 2, and the refrigerant flowed to the first suction port 36 is supplied to the first compressing chamber 34 of the first compressing unit 28 and flows to the second suction port 56 by passing the second diverging passage 54 which is formed in the first diverging passage 52 and the dividing plate 32. The refrigerant flowed to the second suction port 56 is supplied to the second compressing chamber 48 of the second compressing unit 30.

Figure 4 is a cross-sectional view showing the compressing unit of the twin type compressor in accordance with the second embodiment of the present invention.

In the compressing unit of the twin type compressor in accordance with the second embodiment of the present invention, the first and second compressing units 28 and 30 have identical structures as the first and second compressing units described in the above embodiment, but the suction structure of the refrigerant for supplying the refrigerant to the first and second compressing units is different from that of the first embodiment.

That is, the suction pipe 2 which is connected with the accumulator 12 according to the second embodiment is connected with the second suction port 80 of the second compressing unit 30, and diverging passages 82 and 84 are formed at a side of the second suction port 80 and are connected with the first suction port 86 of the first compressing unit 28.

Here, the diverging passages 82 and 84 include a first diverging passage 82 which is formed at a side of the second suction port 80 and a second diverging port 84 which is formed at a side of the dividing plate 32 to connect between the first diverging passage 82 and the first suction port 86.

The first suction port 86 is formed to have a predetermined angle in a downward direction from a side of the first compressing chamber 34 so that it can be connected with the second dividing passage 84.

The operation of the twin type rotary compressor in accordance with the second embodiment of the present invention will be described as follows.

The refrigerant flowed to the second suction port 80 through the suction pipe 2 in the accumulator is supplied to the second compressing chamber 48, flowed to the first suction port 86 through the first and second diverging passages 82 and 84 and supplied to the first compressing chamber 34. The process that the refrigerant is compressed and discharged in the first and second compressing chambers 34 and 48 is identical as in the above- described embodiment, and accordingly the description will be omitted.

INDUSTRIAL APPLICABILITY

As so far described, in a suction mechanism of a rotary compressor, since a suction pipe is connected into the compressor and the suction pipe supplies refrigerant respectively to the first and second compressing units in the accumulator, a single type accumulator can be applied, thus to reduce fabricating process and cost and improve compatibility of the accumulator.

Also, the accumulator and twin type compressor can be connected to a suction pipe, thus to reduce leakage of refrigerant and reducing fabricating process and cost.

Claims

1. A suction mechanism of a rotary compressor comprising: a hermetic vessel to which a suction pipe and a discharge pipe are respectively connected; a driving unit for generating a rotation force; first and second compressing units for compressing refrigerant sucked to the suction pipe by the rotation force generated in the driving unit; and an accumulator which is connected with the suction pipe; wherein a first suction port of the first compressing unit and the accumulator are connected to the suction pipe to supply refrigerant to the first compressing unit, and a diverging passage which is diverged from the first suction port is connected with a second suction port of the second compressing unit.

2. The mechanism of claim 1 , wherein the first suction port is formed at a side of a first cylinder of the first compressing unit to directly connect the suction pipe which is connected with the first compressing chamber of the first compressing unit and the accumulator.

3. The mechanism of claim 1 , wherein the diverging passage includes a first diverging passage which is formed at a side of the first suction port and a second diverging passage which is formed on a dividing plate which divides the first and second compressing units to connect the first diverging passage and the second suction port of the second compressing unit.

4. The mechanism of claim 3, wherein the second suction port is formed at a side of the second cylinder of the second compressing unit to be slanted at a predetermined angle in the upper direction so that the port is connected with the second diverging passage.

5. A suction mechanism of a rotary compressor comprising: a hermetic vessel to which a suction pipe and a discharge pipe are respectively connected; a driving unit for generating a rotation force; first and second compressing units for compressing refrigerant sucked to the suction pipe by the rotation force generated in the driving unit; and an accumulator which is connected with the suction pipe; wherein a second suction port which is formed in the second compressing unit and the accumulator are connected to a suction pipe to supply refrigerant to a second compressing chamber of the second compressing unit, and a diverging passage which is diverged from the second suction port is connected with a first suction port formed in the first compressing unit to supply the refrigerant to a first compressing chamber of the first compressing unit.

6. The mechanism of claim 5, wherein the second suction port is formed at a side of the second cylinder to connect the second compressing chamber formed in the second cylinder of the second compressing unit and a suction pipe connected with the accumulator.

7. The mechanism of claim 5, wherein the diverging chamber includes a first diverging passage which is formed at a side of the second suction port and a second diverging passage which is formed on a dividing plate which divides the first and second compressing units to connect the first diverging passage and the first suction port of the first compressing unit.

8. The mechanism of claim 7, wherein the first suction port is formed at a side of the first cylinder to be slanted at a predetermined angle in the downward direction so that the port is connected with the first diverging passage.