KR102051096B1 - 2-stage scroll compressor and refrigerating cycle system having the same - Google Patents

2-stage scroll compressor and refrigerating cycle system having the same Download PDF

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Publication number
KR102051096B1
KR102051096B1 KR1020130079883A KR20130079883A KR102051096B1 KR 102051096 B1 KR102051096 B1 KR 102051096B1 KR 1020130079883 A KR1020130079883 A KR 1020130079883A KR 20130079883 A KR20130079883 A KR 20130079883A KR 102051096 B1 KR102051096 B1 KR 102051096B1
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KR
South Korea
Prior art keywords
scroll
primary
fixed
compression chamber
wrap
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KR1020130079883A
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Korean (ko)
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KR20150006278A (en
Inventor
박준홍
이재상
김철환
Original Assignee
엘지전자 주식회사
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Priority to KR1020130079883A priority Critical patent/KR102051096B1/en
Publication of KR20150006278A publication Critical patent/KR20150006278A/en
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Publication of KR102051096B1 publication Critical patent/KR102051096B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0021—Systems for the equilibration of forces acting on the pump
    • F04C29/0035—Equalization of pressure pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/028—Means for improving or restricting lubricant flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/902—Hermetically sealed motor pump unit

Abstract

The two-stage scroll compressor according to the present invention and the refrigeration cycle apparatus using the same, the two-stage compressor having a high compression efficiency and low compression noise as the scroll-type primary compression unit and the secondary compression unit is provided together in one sealed container. While it can be obtained, as the oil discharged with the refrigerant in each compression unit is recovered to the same sealed container, oil imbalance between the compression units can be prevented in advance, thereby increasing the freezing capacity and preventing wear.

Description

2-stage scroll compressor and refrigeration cycle device using the same {2-STAGE SCROLL COMPRESSOR AND REFRIGERATING CYCLE SYSTEM HAVING THE SAME}

The present invention relates to a scroll compressor, and more particularly to a two-stage scroll compressor and a refrigeration cycle apparatus using the same.

In general, a refrigeration cycle device is a device for keeping the inside of a refrigerator such as a refrigerator at a low temperature by using a refrigeration cycle consisting of a compressor, a condenser, an expander, and an evaporator.

Refrigeration cycle apparatus applied to the refrigerator has been variously changed in response to the multi-function of the refrigerator. For example, a configuration in which a freezer compartment side evaporator and a refrigerator compartment side evaporator are separately provided so as to independently operate the freezer compartment and the refrigerating compartment. In this case, the '1-COMP 2-EVA method' forming a refrigeration cycle by connecting the freezer compartment evaporator and the refrigerator compartment side evaporator to one compressor, or the '2-compression refrigeration cycle' which consists of a plurality of compressors connected in series. COMP 2-EVA method is known.

In the case of 1-COMP 2-EVA system, as the freezer compartment and the refrigerating compartment are cooled by one compressor, the compressor operates with the same cooling capacity regardless of the load size. In the case of the 2-COMP 2-EVA method, the primary compressor (or low stage compressor) and the secondary compressor (or high stage compressor) are properly controlled to operate the compressor according to the load, thus reducing power consumption. can do. However, in the case of 2-COMP 2-EVA method, the refrigerant and oil are circulated in the primary compressor and the secondary compressor in turn depending on the operating conditions, or the refrigeration cycle connected to some compressors, so the oil is condenser or evaporator of the refrigeration cycle. Or there is a problem that is accumulated in the pipe forming the cycle is the capacity of the refrigeration cycle is reduced or the amount of oil in the compressor is insufficient to cause burnout of the compressor.

An object of the present invention is to provide a two-stage scroll compressor and a refrigeration cycle apparatus using the same that can reduce the waste of power consumption and prevent oil shortage by compressing the refrigerant in two stages using a single compressor.

In order to achieve the object of the present invention, a sealed container; A drive motor fixedly coupled to the inside of the hermetic container; A crank shaft coupled to the rotor of the drive motor; A first fixed scroll fixed to the sealed container and having a fixed wrap formed thereon; A primary turning scroll which is eccentrically coupled to the crankshaft and provided with a turning wrap to form a primary compression chamber while pivoting in engagement with the fixed wrap of the primary fixed scroll; A second fixed scroll fixed to the sealed container and having a fixed wrap formed thereon; And a secondary swing scroll which is eccentrically coupled to the crankshaft and is provided with a swing wrap to form a secondary compression chamber while pivoting in engagement with the fixed wrap of the secondary fixed scroll. Can be.

In addition, the primary fixed scroll and the secondary swing scroll are engaged with each other to form a primary compression chamber, and the secondary fixed scroll and the secondary swing scroll are engaged with each other to form a secondary compression chamber. A compressor in which the discharge side of the and the suction side of the secondary compression chamber communicate with each other; A condenser connected to the discharge side of the compressor; And a plurality of evaporators connected to the condenser, the plurality of evaporators being branched in the middle, wherein one of the plurality of evaporators is in communication with the primary compression chamber, and the other evaporator is connected to the secondary compression chamber. A refrigeration cycle apparatus communicating with the first compression chamber and the second compression chamber may be provided having a two-stage scroll compressor.

The two-stage scroll compressor according to the present invention and the refrigeration cycle apparatus using the same, the two-stage compressor having a high compression efficiency and low compression noise as the scroll-type primary compression unit and the secondary compression unit is provided together in one sealed container. While it can be obtained, as the oil discharged with the refrigerant in each compression unit is recovered to the same sealed container, oil imbalance between the compression units can be prevented in advance, thereby increasing the freezing capacity and preventing wear.

1 is a longitudinal sectional view showing an example of a two-stage scroll compressor according to the present invention;
2 is an enlarged longitudinal sectional view of the compression unit in the compressor according to FIG. 1;
3 is a cross-sectional view showing a first fixed scroll in the compression unit according to FIG.
4 is a sectional view "II-II" showing the primary compression unit in the compression unit according to FIG.
5 is a cross-sectional view of the "III-III" showing the secondary compression unit in the compression unit according to FIG.
Figure 6 is a "IV-IV" sectional view showing a secondary fixed scroll in the compression unit according to Figure 2,
7 is a "VV" sectional view showing the bottom of the intermediate plate in the compression unit according to FIG.
8 is a "VI-VI" sectional view showing the upper surface of the intermediate plate in the compression unit according to FIG.
9 is a system diagram showing an example in which a refrigeration cycle apparatus having a two-stage scroll compressor according to the present embodiment is applied to a refrigerator;
10 is a longitudinal sectional view showing another example of a two-stage scroll compressor according to the present invention.

Hereinafter, a two-stage scroll compressor according to the present invention and a refrigeration cycle apparatus using the same will be described in detail with reference to the attached embodiment.

1 is a longitudinal sectional view showing an example of a two-stage scroll compressor according to the present invention, Figure 2 is a longitudinal sectional view showing an enlarged compression unit in the compressor according to Figure 1, Figures 3 to 8 is "II" according to Figure 2 , "II-II", "III-III" '"IV-IV", "VV", "VI-VI" sectional views.

As shown in this, in the two-stage scroll compressor according to the present embodiment, the drive motor 20 is installed inside the sealed container 10, and the crankshaft 23 to be described later above the drive motor 20. A primary compression unit C1 and a secondary compression unit C2 are installed to support the upper end and compress the refrigerant in two stages, and a lower frame that supports the lower end of the crankshaft 23 under the drive motor 20. 30 may be installed.

The airtight container 10 may be formed by sealing the upper and lower ends of the casing 11 having a cylindrical shape with the upper shell 12 and the lower shell 13, respectively. However, when provided with a plurality of compression units of the scroll type as in the present embodiment may be formed by fastening the casing, the upper shell and the lower shell to each other.

The sealed container 10 is fixedly coupled to the inside of the casing (11) to form a primary fixed scroll (110) forming a primary compression unit (C1), the upper side of the primary fixed scroll (110) a sealed container (10) ) Is fixedly coupled to the intermediate plate 150 for separating the primary compression unit (C1) and the secondary compression unit (C2), the upper side of the intermediate plate 150 is fixedly coupled to the sealed container secondary fixed scroll 120 may be installed.

In addition, the primary fixed scroll 110 is connected to the primary suction port 114 to be described later, the primary suction pipe 15 is connected to guide the refrigerant to the primary compression unit C1 in the refrigeration cycle apparatus, and the secondary fixed scroll The secondary suction pipe 16 may be connected to the secondary suction port 124 to be described later so that the refrigerant may be guided to the secondary compression unit C2 in the refrigeration cycle apparatus. The discharge pipe 17 may be connected to the casing 11 so that the refrigerant compressed in two stages and discharged into the inner space of the sealed container 10 is guided to the refrigeration cycle apparatus.

Here, the first fixed flow path (F1) is formed in the first fixed scroll 110 and the intermediate plate 150 so that the refrigerant compressed by the first stage in the primary compression unit (C1) to the secondary compression unit (C2). Can be. In addition, an intermediate chamber S3 may be formed on a lower surface of the first fixed scroll 110 so that the discharge side of the first compression unit C1 and the first communication passage F1 communicate with each other.

In addition, the second fixed scroll 120, the intermediate plate 150, and the first fixed scroll 110 are compressed in two stages in the secondary compression unit C2 and discharged into the upper space S1 of the hermetic container 10. The second communication flow path F2 may be formed to guide the lower space S2 of the sealed container 10.

The drive motor 20 may include a stator 21 fixed to the inner surface of the casing 11 and a rotor 22 positioned inside the stator 21 and rotated by interaction with the stator 21. have. The crankshaft 23 that rotates with the rotor 22 may be coupled to the center of the rotor 22.

An oil passage 23a is formed in the center of the crank shaft 23 along the longitudinal direction of the crank shaft 23, and the oil stored in the lower cap 13 is supplied to the upper end of the crank shaft 23. An oil pump 24 may be installed. At the upper end of the crankshaft 23, the first eccentric portion 23b and the second eccentric portion 23c may be formed eccentrically with a phase difference of 180 °.

The primary compression unit C1 may be formed by installing a primary pivot scroll 130 between an upper surface of the primary fixed scroll 110 and a lower surface of the intermediate plate 150. The primary pivot scroll 130 may be eccentrically coupled to the first eccentric portion 23b of the crankshaft 23 to be pivotally supported on the upper surface of the primary fixed scroll 110.

3 and 4, the fixing wrap 112 is formed on the upper surface of the hard plate portion 111 of the primary fixed scroll 110, the fixed wrap on the lower surface of the hard plate portion 131 of the primary turning scroll 130 A turning wrap 132 may be formed to form two pairs of primary compression chambers P1 which are continuously engaged with the 112.

The bearing hole 113 is formed in the center of the hard plate portion 111 of the primary fixed scroll 110 so that the crankshaft 23 penetrates, and the primary surface of the primary fixed scroll 110 is formed on the outer circumferential surface of the hard plate portion 111 of the primary fixed scroll 110. A primary suction port 114 is formed to be connected to the primary suction pipe 15 in a radial direction so as to communicate with the outermost compression chamber of the compression unit C1, and is formed around the bearing hole 113 of the primary fixed scroll 110. The primary discharge port 115 may be formed in the final compression chamber of the primary compression unit (C1) to communicate with the intermediate chamber (S3).

In addition, a plurality of chamber protrusions 116a and 116b are formed on the bottom surface of the first fixed scroll 110 so as to be spaced apart by a predetermined interval in the radial direction so as to form an intermediate chamber S3 therebetween. The chamber plates 117 may be sealedly coupled to the chamber protrusions 116a and 116b. In addition, the first fixed scroll 110 is in communication with the intermediate chamber (S3) and at the same time communicated to the second communication hole 158 of the intermediate plate 150 to be described later discharged to the intermediate chamber (S3) of the first stage compressed refrigerant The first communication hole 118 may be formed to guide the to the secondary compression unit C2.

The first shaft coupling portion 133 may be formed through the center of the hard plate portion 131 of the primary turning scroll 130 so that the first eccentric portion 23b of the crankshaft 23 may be coupled thereto. In addition, a pivoting side first key groove 134 may be formed at an upper surface edge of the hard plate portion 131 of the first pivoting scroll 130 so as to be coupled to the first old dam ring 160 to be described later.

In addition, the hard plate part 131 of the primary turning scroll 130 bypasses a part of the refrigerant that is primarily compressed from the intermediate compression chamber of the primary compression chamber C1 to the back pressure chamber between the intermediate plates 150 to be described later. 1 back pressure hole 135 may be formed. Accordingly, the primary swing scroll 130 is axially supported by the pressure of the back pressure chamber formed between the intermediate plate 150 and the axial direction between the primary fixed scroll 110 and the primary swing scroll 130. Leakage can be effectively prevented.

The secondary compression unit C2 may be formed by installing the secondary swing scroll 140 between the lower surface of the secondary fixed scroll 120 and the upper surface of the intermediate plate 150. The secondary swing scroll 140 may be eccentrically coupled to the second eccentric portion 23c of the crankshaft 23 to be pivotally supported on the upper surface of the intermediate plate 150.

5 and 6, the fixing wrap 122 is formed on the lower surface of the hard plate portion 121 of the secondary fixed scroll 120, the fixed wrap on the upper surface of the hard plate portion 141 of the secondary turning scroll 140 A turning wrap 142 may be formed to form two pairs of secondary compression chambers P2 continuously engaged with the 122.

A shaft hole 123 is formed in the center of the hard plate portion 121 of the secondary fixed scroll 120 so that the upper end of the crank shaft 23 passes, and the upper end of the crank shaft 23 is formed at the upper end of the shaft hole 123. The first ball bearing 41 may be installed to support the radial direction. In addition, a secondary suction port 124 is formed on the outer circumferential surface of the hard plate part 121 of the secondary fixed scroll 120 so that the secondary suction pipe is connected to communicate with the outermost compression chamber, and the shaft hole 123 of the secondary fixed scroll 120 is formed. The secondary discharge port 125 may be formed to communicate with the upper space (S1) of the closed container 110 in the final compression chamber of the secondary compression unit (C2) around. The second fixed scroll 120 is formed with a third communication hole 126 in communication with the second communication hole 158 of the intermediate plate 150 to be described later, the third communication hole 126 is the secondary suction port 124 ) Can be connected.

The second shaft coupling portion 143 may be formed through the center of the hard plate portion 141 of the secondary turning scroll 140 so that the second eccentric portion 23c of the crankshaft 23 may be coupled thereto. In addition, a turning side second key groove 144 may be formed on the upper edge of the hard plate portion 140 of the second turning scroll 140 so as to be coupled to the second old dam ring 170.

In addition, the hard plate part 141 of the secondary turning scroll 140 bypasses a part of the refrigerant that is secondarily compressed from the intermediate compression chamber of the secondary compression chamber C2 to the back pressure chamber between the intermediate plates 150 to be described later. 2 back pressure holes 145 may be formed. Accordingly, the secondary swing scroll 140 is axially supported by the pressure of the back pressure chamber formed between the intermediate plate 150 and the axial direction between the secondary fixed scroll 120 and the secondary swing scroll 140. Leakage can be effectively prevented.

As shown in Figure 7 and 8, the bottom of the intermediate plate 150, the bottom surface is the hard plate portion 111 of the primary fixed scroll 110, the top surface of the secondary plate fixed plate 120 of the fixed plate 120 Seals 151 are formed to protrude so as to seal each other, and the support 152 to support the bottom of the primary pivot scroll 130 and the top of the secondary pivot scroll 140 at the center of the intermediate plate 150, respectively. ) May extend from the inner circumferential surface of the sealing unit 151 to form a disk.

A through hole 153 is formed in the center of the support part 152 so that the crankshaft 23 penetrates, and a first scroll seating groove 154 into which the primary turning scroll 120 is inserted around the bottom surface of the through hole 153. ) Is formed, and a fixed side first key groove 155 may be formed on the main surface of the first scroll seating groove 154 so that the first old dam ring 160 may be coupled thereto. A second scroll seating groove 156 is formed around the upper surface of the through hole 153, and a second old seat ring 170 is formed on a main surface of the second scroll seating groove 156. The fixed side second key groove 158 may be formed to be coupled. A second portion connected to the first communication hole 118 of the primary fixed scroll 120 at the edge of the support portion 152 or the seal portion 151 for guiding the first compressed refrigerant to the secondary compression portion C2. The communication hole 158 may be formed through.

In addition, a drainage hole 159 is formed in the radial direction from the inner circumferential surface of the through hole 153 to the outer circumferential surface of the sealing portion 151 so as to discharge a part of the oil supplied through the crankshaft 23. The drainage groove 159a may be stepped on the outer circumferential surface of the 151 to allow the drainage hole 158 to communicate with the inner space of the sealed container 10.

A shaft hole 31 is formed in the center of the lower frame 30 so that the lower end of the crank shaft 23 passes, and the lower end of the crank shaft 23 is radially formed in the shaft hole 31 of the lower frame 30. The second ball bearing 42 may be installed to support it.

Meanwhile, each of the fixed wraps 112 and 122 and the turning wraps 132 and 142 of the primary compression unit C1 and the secondary compression unit C2 may be formed in an involute curve. It may be formed to have a curve other than the involute curve. The fixed wrap and the swing wrap of the primary compression section may be formed in the same shape as the fixed wrap and the swing wrap of the secondary compression section.

Figure 4 is a plan view showing a coupling state of the fixed wrap and the rotating wrap forming the primary compression. Referring to this, when the center of the first shaft coupling portion 133 is referred to as O, and the two contact points are A and B, respectively, the two contact points A and B are connected to the center O of the shaft coupling portion. It can be seen that the angle α defined by the two straight lines is smaller than 360 ° and the distance l between the normal vectors at each contact point is also larger than zero. Accordingly, the compression ratio can be increased since the outer compression chamber immediately before the discharge has a smaller volume than the case where the fixed wrap and the swirl wrap made of the involute curve are provided.

The protrusion 112a protruding toward the first shaft coupling portion 133 is formed near the inner end of the fixed wrap 112, and the contact portion 112b protruding from the protrusion 112a is formed in the protrusion 112a. May be further formed. Accordingly, the inner end of the fixing wrap may be formed to have a larger thickness than other portions.

The first shaft coupling portion 133 may be formed with a recess 132a that is engaged with the protrusion 112a. One side wall of the concave portion 132a may be in contact with the contact portion 112b of the protrusion 112a to form one contact point A of the outer compression chamber.

Meanwhile, the fixed wrap 122 and the swing wrap 142 of the secondary compression unit C2 may be formed in the same shape as the fixed wrap 112 and the swing wrap 132 of the primary compression unit C1. Therefore, description thereof is omitted.

Unexplained sign in the drawing

In the two-stage scroll compressor according to the present embodiment as described above, when the crankshaft 23 rotates by applying power to the driving motor 20, the first compression unit C1 of the first compression unit C1 is rotated by the crankshaft 23. The secondary turning scroll 130 forms a pair of two primary compression chambers P1 while pivoting about the primary fixed scroll 110. Then, the refrigerant is sucked into the primary compression chamber P1 through the primary suction port 114 and is first compressed while moving inward, and the refrigerant compressed in the first stage in the primary compression chamber P1 is fixed first. It is discharged to the intermediate chamber S3 through the primary discharge port 115 of the scroll 110. At this time, since the volume of the intermediate chamber S3 is larger than the final compression chamber volume of the primary compression unit C1, the first stage compressed refrigerant discharged to the intermediate chamber S3 forms an intermediate pressure.

On the other hand, the secondary turning scroll 140 along with the primary turning scroll 130 to form a pair of two secondary compression chamber (P2) while the pivoting movement with respect to the secondary fixed scroll (120). Then, the first stage compressed refrigerant discharged to the intermediate chamber S3 is sucked into the secondary compression chamber P2 of the second compression unit C2 along the flow path, and the refrigerant sucked into the secondary compression chamber P2. In the pivoting movement of the secondary swing scroll 140 is moved inwards and compressed in two stages, the refrigerant compressed in the second stage in the second compression unit (C2) is discharged into the inner space of the sealed container 10 and then refrigerated cycle The process of discharge is repeated.

The two-stage scroll compressor according to the present embodiment as described above is provided with a scroll type primary compression unit and a secondary compression unit in one hermetically sealed container, thereby obtaining high compression efficiency and greatly reducing compression noise.

At the same time, since the primary compression unit and the secondary compression unit are provided in one sealed container, the oil discharged together with the refrigerant is recovered in the same sealed container, thereby preventing oil unbalance between the compression units in advance, thereby increasing the freezing capacity. By preventing wear, it is possible to improve the reliability of the refrigeration cycle apparatus including the compressor.

9 is a system diagram showing an example in which a refrigeration cycle apparatus having a two-stage scroll compressor according to the present embodiment is applied to a refrigerator. As shown in the drawing, in the refrigeration cycle apparatus according to the present embodiment, the first refrigerant pipe L1 is connected to the discharge pipe 17 of the two-stage scroll compressor (hereinafter, referred to as a two-stage compressor) 1, and the first refrigerant A condenser 2 is connected to the middle of the pipe L1, a second refrigerant pipe L2 is connected to the outlet of the condenser 2, an expander 3 is connected to the second refrigerant pipe L2, and an expander. A third refrigerant pipe L3 may be connected to the outlet of (3), and a refrigerant reservoir 4 may be connected to the third refrigerant pipe L3.

A fourth refrigerant pipe (L4) is connected to the outlet of the refrigerant storage unit (4), and a refrigerant switching valve (5) consisting of a three-way valve is connected to the fourth refrigerant pipe (L4) to control the flow direction of the refrigerant. The first branch pipe L41 may be connected to the first outlet of the refrigerant switching valve 5, and the second branch pipe L42 having the expander 6 may be connected to the second outlet.

A freezer compartment side evaporator 7 is connected to the first branch pipe L41, and a refrigerating compartment side evaporator 8 is connected to the second branch pipe L42, respectively, and a fifth refrigerant pipe ( L5), the sixth refrigerant pipe (L6) is connected to the outlet of the refrigerator compartment side evaporator 8, respectively, the fifth refrigerant pipe (L5) to the primary suction pipe 15, the sixth refrigerant pipe (L6) is 2 It may be connected to the primary suction pipe 16, respectively.

The other end of the refrigerant storage unit 4 is connected with a bypass tube L7, and the bypass tube L7 is connected to the sixth refrigerant tube L6 between the freezer compartment side evaporator 8 and the secondary suction tube 16. Can be connected.

In the refrigeration cycle apparatus according to the present embodiment as described above, the refrigerant switching valve according to the operation mode of the refrigerator selectively controls the flow direction of the refrigerant toward the freezer compartment side evaporator or the refrigerator compartment side evaporator to operate both the freezer compartment and the refrigerator compartment of the refrigerator. Simultaneous operation or freezer operation, which operates only the freezer compartment, or the refrigerating compartment operation, which operates only the refrigerating compartment, may be performed.

For example, in the simultaneous operation mode in which both the freezing compartment and the refrigerating compartment are operated, the refrigerant passing through the condenser 2 and the expander 3 is frozen while both the first and second outlets of the refrigerant switching valve 5 are opened. The evaporator 7 and the refrigerator compartment side evaporator 8 are moved in the directions.

Then, the refrigerant sucked into the primary compression unit C1 via the freezer compartment side evaporator 7 is discharged after being compressed in the first stage by the primary compression unit C1, and the intermediate chamber S3 in the primary compression unit C1. The refrigerant of the first stage compressed medium pressure discharged to the second stage is sucked into the secondary compression unit C2. At this time, the refrigerant passing through the refrigerating chamber side evaporator 8 is sucked into the secondary compression unit C2 through the sixth refrigerant pipe L6 and the secondary suction pipe 16, and is combined with the refrigerant compressed in the first stage to form the secondary compression unit. Inhaled at (C2).

Then, the refrigerant compressed through the first stage and the refrigerant passing through the refrigerating chamber side evaporator 8 are compressed in the secondary compression unit C2 and discharged into the sealed container internal space of the compressor 1, and in the secondary compression unit C2. The refrigerant discharged into the inner space of the sealed container moves to the condenser 2 through the discharge tube 17 and the first refrigerant tube L1 to condense, and the refrigerant condensed in the condenser 2 is the second refrigerant tube L2. ), The expander (3) and the third refrigerant pipe (L3) after passing through a series of processes circulating while being distributed from the refrigerant switching valve (5) toward the freezer compartment evaporator (7) and the refrigerator compartment side evaporator (8). do.

On the other hand, in the freezer compartment operation mode, the refrigerant switching valve 5 blocks the refrigerating compartment side evaporator 7, that is, the second outlet, and opens only the first outlet, which is the freezer compartment side evaporator 8, to pass through the condenser 2. The refrigerant is allowed to move only toward the freezing chamber side evaporator (7). Here, the primary compression unit (C1) and the secondary compression unit (C2) is a refrigerant of the refrigerating cycle by repeating a series of processes to circulate while continuously compressing the refrigerant sucked into the primary compression unit (C1) in two stages To quickly compress to a pressure suitable for freezer operation.

On the other hand, in the refrigerating chamber operation mode, the refrigerant switching valve 5 blocks the first outlet and opens the second outlet. Then, the primary compression unit C1 is stopped and only the secondary compression unit C2 starts operation. Then, the refrigerant passing through the condenser 2 moves only in the direction of the refrigerating chamber side evaporator 8 and is compressed in the first stage through the secondary suction port 124 in the secondary compression unit C2 to move to the condenser 2. By repeating the process of the refrigerant cycle of the refrigeration cycle apparatus to be compressed to a pressure suitable for the operation of the refrigerator compartment without overcompression.

In the operation process of the refrigeration cycle device as described above, the oil is circulated with the primary compression unit (C1) and the secondary compression unit (C2) while moving with the refrigerant, but the primary compression unit (C1) and secondary compression As the unit C2 is installed in one airtight container 10 and oil is supplied by one crankshaft 23, the primary compression unit C1 and the secondary compression unit C2 according to the operation mode of the refrigerator are provided. Oil imbalances between the can be prevented in advance.

On the other hand, if there is another embodiment of a two-stage scroll compressor according to the present invention.

That is, in the above-described embodiment, the intermediate plate is fixedly installed between the primary fixed scroll and the secondary fixed scroll, and the primary swing scroll is disposed between the primary fixed scroll and the intermediate plate, and between the secondary fixed scroll and the intermediate plate. The secondary turning scroll is provided in each of the present embodiment, but as shown in FIG. 10, the first fixed scroll and an integral fixed scroll 210 in which the second fixed scroll is integrally formed are formed so that the primary turning scroll 220 and It is to be arranged between the secondary turning scroll (230). In the drawings, reference numeral 15 denotes a primary suction tube, 16 secondary suction tube, 17 discharge tube, 20 drive motor, 21 stator, 22 rotor, 23 crankshaft, 231 secondary discharge port, and 240 The first frame, 250 is the second frame, and 251 is the discharge hole.

Even in this case, the basic configuration and operation effects are similar to those of the two-stage scroll compressor and the refrigeration cycle apparatus employing the same. However, in the present exemplary embodiment, since the first fixed scroll and the second fixed scroll form one fixed scroll 210 integrated with each other and serve as an intermediate plate of the above-described embodiment, a separate intermediate plate may not be required.

In addition, since the discharge port 211 of the primary compression chamber P1 and the suction port 212 of the secondary compression chamber P2 are connected to the integrated fixed scroll 210, an additional intermediate chamber may not be required. .

Therefore, as the intermediate plate and the intermediate chamber are removed in the above-described embodiment, not only the material cost and the assembly cost can be reduced, but also the compactness of the compressor can be achieved by reducing the space occupied by the intermediate plate and the intermediate chamber.

23: crankshaft 23b, 23c: first and second eccentric portion
41,42: bearing 110: primary fixed scroll
112: primary fixed wrap 114: primary inlet
115: primary discharge port 116a, 116b: chamber protrusion
120: secondary fixed scroll 122: secondary fixed wrap
124: secondary inlet 125: secondary outlet
130: 1st turn scroll 132: 1st turn wrap
133: shaft coupling portion 135: back pressure hole
140: 2nd turning scroll 142: 2nd turning wrap
143: shaft coupling portion 145: back pressure hole
150: intermediate plate F1: first communication hole
F2: second communication channel

Claims (14)

Airtight containers;
A drive motor fixedly coupled to the inside of the sealed container;
A crank shaft coupled to the rotor of the drive motor;
A first fixed scroll fixed to the sealed container and having a fixed wrap formed thereon;
A primary pivoting scroll eccentrically coupled to the crankshaft and provided with a pivoting wrap to form a primary compression chamber while pivoting in engagement with the stationary wrap of the primary fixed scroll;
A second fixed scroll fixed to the sealed container and having a fixed wrap formed thereon; And
And a secondary turning scroll which is eccentrically coupled to the crankshaft and provided with a turning wrap to form a secondary compression chamber while pivoting in engagement with the fixed wrap of the secondary fixed scroll.
An intermediate plate is provided between the primary turning scroll and the secondary turning scroll to support the back of the primary turning scroll and the secondary turning scroll, respectively.
And a through hole through which the crankshaft penetrates the intermediate plate, and a drainage hole penetrating from the through hole to the outer circumferential surface to communicate with the inner space of the sealed container. The method of claim 1,
And a discharge side of the primary compression chamber and a suction side of the secondary compression chamber are configured to communicate with each other. The method of claim 2,
The suction side of the primary compression chamber and the suction side of the secondary compression chamber are respectively communicated with respective suction pipes coupled through the sealed container so as to communicate with the evaporator of the refrigerating cycle apparatus, respectively.
The second compression chamber is a two-stage scroll compressor in communication with the inner space of the sealed container. The method of claim 1,
And the first fixed scroll and the second fixed scroll are integrally formed to be fixedly installed in the airtight container between the primary swing scroll and the secondary swing scroll. The method of claim 1,
The first turning scroll is formed with a first back pressure hole for exhausting the refrigerant between the back surface of the first turning scroll and one side of the intermediate plate in the first compression chamber,
And a second back pressure hole formed in the secondary swing scroll to exhaust the refrigerant between the rear surface of the secondary swing scroll and the other side of the intermediate plate in the secondary compression chamber. The method of claim 1,
One end of the crankshaft is formed with a primary eccentric portion and a secondary eccentric portion to be coupled to the primary turning scroll and the secondary turning scroll, respectively,
And the first eccentric portion and the second eccentric portion are formed with a phase difference of 180 degrees on a plane. The method of claim 1,
One side of the crankshaft is supported by a frame fixed to the hermetic container at one side of the drive motor,
And the other side of the crankshaft is supported by the secondary fixed scroll by passing through the primary fixed scroll, the primary pivot scroll, the intermediate plate, and the secondary pivot scroll on the other side of the drive motor. delete Airtight containers;
A drive motor fixedly coupled to the inside of the hermetic container;
A crank shaft coupled to the rotor of the drive motor;
A first fixed scroll fixed to the sealed container and having a fixed wrap formed thereon;
A primary pivoting scroll eccentrically coupled to the crankshaft and provided with a pivoting wrap to form a primary compression chamber while pivoting in engagement with the stationary wrap of the primary fixed scroll;
A second fixed scroll fixed to the sealed container and having a fixed wrap formed thereon; And
And a secondary turning scroll which is eccentrically coupled to the crankshaft and provided with a turning wrap to form a secondary compression chamber while pivoting in engagement with the fixed wrap of the secondary fixed scroll.
An intermediate chamber is formed between the primary compression chamber and the secondary compression chamber to guide the refrigerant discharged from the primary compression chamber to the secondary compression chamber.
A chamber protrusion is formed on the rear surface of the primary fixed scroll to accommodate the discharge port of the primary compression chamber.
And a chamber cover coupled to the upper end of the chamber protrusion so that the intermediate chamber is formed inside the chamber protrusion. The method of claim 9,
And the first fixed scroll and the second fixed scroll are integrally formed to be fixedly installed in the airtight container between the primary swing scroll and the secondary swing scroll. The method of claim 9,
One end of the crankshaft is formed with a primary eccentric portion and a secondary eccentric portion to be coupled to the primary turning scroll and the secondary turning scroll, respectively,
And the first eccentric portion and the second eccentric portion are formed with a phase difference of 180 degrees on a plane. compressor;
A condenser connected to the discharge side of the compressor; And
And a plurality of evaporators connected to the condenser and provided with a plurality of branches in the middle.
The compressor,
12. A refrigeration cycle apparatus having a two-stage scroll compressor comprising the two-stage scroll compressor of any one of claims 1 to 7. The method of claim 12,
A secondary suction port is formed in the secondary fixed scroll to communicate with the secondary compression chamber,
And the secondary suction port has a two-stage scroll compressor communicating with the discharge side of the primary compression chamber and through the sealed container and communicating with the evaporator. The method of claim 13,
A refrigerant storage unit is installed between the condenser and the plurality of evaporators, and the refrigerant storage unit has a two-stage scroll compressor connected in parallel with the plurality of evaporators by a refrigerant pipe and communicating with the secondary compression chamber by a bypass pipe. Cycle device.

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US10465954B2 (en) 2017-02-06 2019-11-05 Emerson Climate Technologies, Inc. Co-rotating compressor with multiple compression mechanisms and system having same
US11111921B2 (en) * 2017-02-06 2021-09-07 Emerson Climate Technologies, Inc. Co-rotating compressor
WO2021097297A1 (en) 2019-11-15 2021-05-20 Emerson Climate Technologies, Inc Co-rotating scroll compressor
US11624366B1 (en) 2021-11-05 2023-04-11 Emerson Climate Technologies, Inc. Co-rotating scroll compressor having first and second Oldham couplings
US11732713B2 (en) 2021-11-05 2023-08-22 Emerson Climate Technologies, Inc. Co-rotating scroll compressor having synchronization mechanism
KR20230149904A (en) * 2022-04-20 2023-10-30 엘지전자 주식회사 Scroll compressor
KR102639608B1 (en) * 2022-04-20 2024-02-26 엘지전자 주식회사 Scroll compressor
KR20240017262A (en) * 2022-07-29 2024-02-07 엘지전자 주식회사 Scroll Compressor

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