KR101322511B1 - Twin rotary compressor - Google Patents

Abstract

The present invention relates to a rotary twin compressor that can increase the compression capacity by sucking and compressing a refrigerant into two compression spaces, and in particular, a rotary that can simplify the installation structure of the vane that divides the compression space into a suction zone and a discharge zone. The present invention relates to a twin compressor.

The present invention relates to an airtight container, A rotating shaft which is provided in the sealed container and supplies oil while transmitting rotational force; A first compression assembly including a first cylinder into which the refrigerant is sucked in accordance with rotation of the rotary shaft, and a first roller configured to compress the refrigerant while rolling along the inside of the first cylinder; A second compression assembly including a second cylinder into which the refrigerant is sucked in accordance with the rotation of the rotary shaft, and a second roller configured to compress the refrigerant while rolling along the inside of the second cylinder; A unitary vane disposed radially movable in the first and second cylinders so as to contact the first and second rollers, and partitioning the first and second cylinder inner spaces into suction and discharge regions through which refrigerant is sucked and discharged; And, provides a rotary twin compressor comprising a; elastic member for elastically supporting the integral vane in the movement direction.

Description

Rotary Twin Compressor {TWIN ROTARY COMPRESSOR}

The present invention relates to a rotary twin compressor that can increase the compression capacity by sucking and compressing a refrigerant into two compression spaces, and in particular, a rotary that can simplify the installation structure of the vane that divides the compression space into a suction zone and a discharge zone. The present invention relates to a twin compressor.

Generally, a compressor is a mechanical device that receives power from an electric motor or turbine, and compresses air, refrigerant or various other operating gases to increase the pressure. The compressor is used in a household appliance such as a refrigerator and an air conditioner, It is widely used throughout.

Such a compressor is broadly classified into a reciprocating compressor that compresses the refrigerant while linearly reciprocating the piston inside the cylinder so as to form a compression space in which a working gas is sucked and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while eccentrically rotating the roller along the inner wall of the cylinder so as to form a compression space in which a working gas is sucked and discharged between the roller and the cylinder, And a scroll compressor for compressing the refrigerant while the orbiting scroll is rotated along the fixed scroll so as to form a compressed space between the orbiting scroll and the fixed scroll, Respectively.

In particular, a rotary compressor includes two rollers and two cylinders at the top and bottom, a rotary twin compressor for compressing the rest of the total compression capacity of the upper and lower rollers and cylinder pairs, A pair of rollers and two cylinders, two cylinders communicating, one pair compressing a relatively low-pressure refrigerant, and the other pair compressing a relatively high-pressure refrigerant after the low- Compressors and the like.

Korean Patent Publication No. 1994-0001355 discloses a rotary compressor. An electric motor is located inside the shell, and a rotating shaft is installed so as to pass through the electric motor. Further, a cylinder is located in the lower portion of the electric motor, and an eccentric portion fitted in the rotary shaft and a roller fitted in the eccentric portion are located inside the cylinder. The cylinder is provided with a coolant discharge hole and a coolant inflow hole, and a vane is provided between the coolant discharge hole and the coolant inflow hole so as not to mix with the high-pressure coolant compressed by the low-pressure coolant. Also, a spring is provided at one end of the vane in order to maintain the eccentrically rotating roller and the vane in contact with each other. When the rotary shaft is rotated by the electric motor, the eccentric portion and the roller rotate along the inner periphery of the cylinder to compress the refrigerant gas, and the compressed refrigerant gas is discharged through the refrigerant discharge hole.

Republic of Korea Patent Publication No. 10-2005-0062995 discloses a rotary twin compressor. By providing two cylinders for compressing the same capacity, the compression capacity was improved twice as compared to the first stage compressor.

Republic of Korea Patent Publication No. 10-2007-0009958 discloses a rotary two-stage compressor. A low pressure compression element for primary compression of the refrigerant and a high pressure compression element for secondary compression of the refrigerant were provided to improve the degree of compression twice compared to the first stage compressor.

In more detail, the rotary two-stage compressor may be divided into a high pressure compressor filled with a high pressure refrigerant after the inside of the sealed container is compressed and a low pressure compressor filled with a low pressure refrigerant before the inside of the sealed container is compressed. It depends on the installation location of the inlet and outlet pipes.

That is, the rotary two-stage high pressure compressor has an electric motor 1110, a low pressure compression element 1120 and a high pressure compression element 1130, an intermediate plate 1140, inside the sealed container 1101, as shown in FIG. 2. The main bearing 1161 and the sub-bearing 1162, the upper and lower covers (1171, 1172) are provided, the refrigerant compressed in the low-pressure compression element 1120 outside the sealed container 1101 for the high pressure compression element (1130) Is provided with a connection flow path 1180 for guiding the refrigerant flow path, and the inlet pipe 1151 through which the refrigerant is sucked is installed to communicate with the low pressure compression element 1120 through the sealed container 1101, and the outlet pipe through which the refrigerant is discharged. 1152 is installed to communicate with the hermetically sealed container 1101.

On the other hand, the rotary two-stage low pressure compressor is installed so that the inlet tube 1151, through which the refrigerant is sucked, communicates with the hermetically sealed container 1101, as shown in FIG. 3, and the outlet tube 1152, through which the refrigerant is discharged, is a hermetically sealed container ( It is installed to communicate with the high pressure compression element 1130 through the 1101.

As shown in FIG. 3, the rotary two-stage compressor continuously compresses the refrigerant in the low pressure compression element 1120 and the high pressure compression element 1130 as the rotating shaft 1113 rotates. At this time, the low pressure compression element 1120 is composed of a low pressure cylinder 1121, a low pressure eccentric 1122, a low pressure roller 1123, a low pressure vane 1124 and a spring 1125, and a high pressure compression element 1130. Also composed of a high pressure cylinder 1131, a high pressure eccentric 1132, a high pressure roller 1133, a high pressure vane 1134 and a spring 1135, the low pressure eccentric 1112 and the high pressure eccentric 1132 is a rotating shaft ( 1113 to be eccentric in opposite directions to each other.

Therefore, when the rotating shaft 1113 rotates, the refrigerant sucked into the low pressure cylinder 1121 is compressed and discharged while the low pressure roller 1123 rolls along the inside of the low pressure cylinder 1121, and the low pressure vane 1124 is spring 1125. As it is elastically supported by the vane mounting hole 1124h, the suction area and the discharge area are partitioned between the low pressure cylinder 1121 and the low pressure roller 1123 so that the suction and discharge of the refrigerant are performed inside the low pressure cylinder 1121. do. As such, the refrigerant compressed in the low pressure cylinder 1121 and then sucked into the high pressure cylinder 1131 through the connecting flow path 1180 is compressed and discharged while the high pressure roller 1133 rolls along the inside of the high pressure cylinder 1131. However, the high pressure vane 1134 is also elastically supported by the vane mounting hole 1134h by the spring 1135 to partition the suction region and the discharge region between the high pressure cylinder 1131 and the high pressure roller 1133 so as to separate the high pressure cylinder ( 1131 to allow the refrigerant to be sucked and discharged from the inside.

However, the conventional rotary two stage compressor has a low pressure vane and Not only is it difficult to construct a spring that elastically supports the high pressure vanes at the same time, but the number of parts and assembly time increase as each spring is provided, and furthermore, the operation reliability decreases as the low pressure vanes and the high pressure vanes, respectively, are installed separately. There is this.

However, the conventional rotary twin compressor can simplify the parts and installation structure of the vanes because the two vanes are not only eccentric in the same direction with respect to the rotation axis but also operate in the same direction.

The present invention has been made to solve the above-mentioned problems of the prior art, and a rotary twin compressor capable of simplifying a component and an installation structure for dividing the low pressure compression space and the high pressure compression space into the suction region and the discharge region, respectively. The purpose is to provide.

According to an aspect of the present invention, A rotating shaft which is provided in the sealed container and supplies oil while transmitting rotational force; A first compression assembly including a first cylinder into which the refrigerant is sucked in accordance with rotation of the rotary shaft, and a first roller configured to compress the refrigerant while rolling along the inside of the first cylinder; A second compression assembly including a second cylinder into which the refrigerant is sucked in accordance with the rotation of the rotary shaft, and a second roller configured to compress the refrigerant while rolling along the inside of the second cylinder; A unitary vane disposed radially movable in the first and second cylinders so as to contact the first and second rollers, and partitioning the first and second cylinder inner spaces into suction and discharge regions through which refrigerant is sucked and discharged; And, provides a rotary twin compressor comprising a; elastic member for elastically supporting the integral vane in the movement direction.

In addition, the first and second cylinders each include a vane mounting hole having an inner diameter side open, and the integrated vane is seated in the vane mounting hole of the first vane portion and the second vane portion of the vane mounting hole of the first cylinder. It provides a rotary twin compressor comprising a second vane portion and a connecting portion for connecting the first and second vanes in the axial direction.

The rotary twin compressor may further include an intermediate plate installed to partition between the first and second cylinders, and the integrated vane further includes an interference preventing groove further adjacent to the intermediate plate. to provide.

In addition, the integrated vane provides a rotary twin compressor further comprising a mounting groove in which the elastic member is seated in the radial direction at the connection portion on the side opposite to the first and second rollers.

The rotary twin compressor according to the present invention configured as described above applies an integrated vane to be in contact with the two rollers even when two rollers are rolled inside the two cylinders in order to partition the two compression spaces, and at the same time, the integrated vane is one elastic. The elastic support of the member allows the two rollers and one vane to operate in the same phase while being in contact with each other, thereby increasing operational reliability, reducing the number of parts and simplifying the assembly process, thereby increasing productivity. In addition, since the connecting portion connecting the first and second vanes to the intermediate plate is configured to form an integrated vane, even when the integrated vane reciprocates linearly in a radial direction, the leakage of the refrigerant can be reduced and the compression performance can be improved. There is an advantage.

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

4 is a view showing an example of a rotary twin compressor according to the present invention. As shown in FIG. 4, the rotary twin compressor according to the present invention includes a sealed container 101, an electric motor 110 generating rotational force, a first compression assembly 120 compressing a part of the sucked refrigerant, and a sucked refrigerant. A second compression assembly 130 for compressing the rest of the second intermediate plate 140 partitioning the first and second compression assemblies 120 and 130, and a first discharge space communicating with the lower side of the first compression assembly 120. The first bearing 161 and the cover 171, the second bearing 162 and the cover 172 constituting the second discharge space communicated with the upper side of the second compression assembly 130 are configured to include. Of course, the rotary twin compressor 100 constitutes a part of a refrigeration cycle including a condenser, a capillary tube or an electronic expansion valve, and an evaporator, and after the gas-liquid refrigerant is separated from the accumulator (A), only the gas refrigerant is a rotary twin compressor ( 100).

At this time, the first and second inlet pipes 151 and 152 for sucking the refrigerant through the first and second compression assemblies 120 and 130 are respectively penetrated into the sealed container 101, and the high pressure refrigerant is discharged to the upper side of the sealed container 101. Outflow pipe 152 is installed, the closed container 101 is filled with a high-pressure refrigerant compressed in the first and second compression assemblies (120,130).

The electric motor 110 includes a stator 111, a rotor 112, and a rotating shaft 113. The stator 111 is provided with coils wound around lamination lamination of ring-shaped electromagnetic steel plates and lamination. The rotor 112 also has a lamination laminated with an electromagnetic steel plate. The rotating shaft 113 passes through the center of the rotor 112 and is fixed to the rotor 112. When the electric current is applied to the electric motor 110, the rotor 112 rotates by the mutual electromagnetic force between the stator 111 and the rotor 112, and the rotary shaft 113 fixed to the rotor 112 also rotates together with the rotor 112 Rotate together. The rotating shaft 113 extends from the rotor 112 to the first compression assembly 120 so as to pass through the center portion of the first compression assembly 120, the intermediate plate 140, and the second compression assembly 130.

The first compression assembly 120 and the second compression assembly 130 have a middle plate 140 therebetween, and the first compression assembly 120-the middle plate 140-the second compression assembly 130 from the bottom. The second compression assembly 120, the middle plate 140, and the second compression assembly 130 may be stacked in order from the bottom. In addition, regardless of the stacking order of the first compression assembly 120, the intermediate plate 140, and the second compression assembly 130, the first bearing 161 and the first bearing 161 and the first compression assembly 120, 130 may be disposed on the lower and upper portions, respectively. Two bearings 162 are installed to assist the rotation of the rotary shaft 113, and support the load of each component of the two-stage compression assembly (120, 130) stacked vertically. The second bearing 162 installed on the upper side is welded to the sealed vessel 101 by three points to support the load of the two-stage compression assemblies 120 and 130 and is fixed to the closed vessel 101.

A first discharge space in which the refrigerant compressed in the first compression assembly 120 is temporarily stored by the first bearing 161 and the cover 171 is formed below the first compression assembly 120, and the second compression assembly A second discharge space in which the refrigerant compressed in the second compression assembly 130 is also temporarily stored by the second bearing 162 and the cover 172 is formed on the upper side, and the first and second discharge spaces are It serves as a buffer space on the refrigerant passage. Of course, discharge ports 161h and 162h and discharge valves 161a and 162a are provided in the first and second bearings 161 and 162 so that the refrigerant compressed into the first and second discharge spaces can flow in and out. Holes communicating with the inside of the sealed container 101 may also be provided at the 171 and 172.

5 is a view showing an example of the first compression assembly of the rotary twin compressor according to the present invention from the bottom. As illustrated in FIG. 5, the first compression assembly 120 includes a first cylinder 121, a first eccentric portion 122, a first roller 123, and a first vane portion B1. The first cylinder 121 is provided with a vane mounting hole 124h in which the first vane portion 122 is elastically supported by the elastic member S at an inner diameter thereof, and has a sealed container 101 at one side of the vane mounting hole 124h. While the inlet 126 is provided to connect the first inlet pipe 151 penetrating through the (), the outlet 127 is provided on the other side of the vane mounting hole (124h) in communication with the first discharge space. That is, the inner space of the first cylinder 121 is divided into the suction region S and the discharge region D by the first roller 123 and the first vane portion B1, and the refrigerant before and after compression is removed. It coexists in one cylinder 121.

Accordingly, when the first eccentric portion 122 is rotated together with the rotation shaft 113, the first roller 123 is rolled along the inside of the first cylinder 121, and the first vane portion B1 causes the first vane portion B1 to rotate. The refrigerant sucked into the suction area through the first inlet pipe 151 and the suction port 126 is divided into a suction area S and a discharge area D between the cylinder 121 and the first roller 123. After being compressed in the discharge region D, the discharge is performed through the discharge port 127 and the first discharge space.

6 is a view showing an example of the second compression assembly of the rotary twin compressor according to the present invention from the top. As shown in FIG. 6, the second compression assembly 130 includes a second cylinder 131, a second eccentric portion 132, a second roller 133, and a second vane portion B2. Since the compression assembly 120 is configured in the same manner as the compression assembly 120, detailed descriptions of components and operations will be omitted. However, like the first eccentric portion 122 (shown in FIG. 5), the second eccentric portion 132 is eccentric so as to have the same phase with respect to the rotation axis 113, and the vane mounting in which the second vane portion B2 is mounted. The hole 134h, the suction port 136 in communication with the second inlet pipe 152, and the discharge port 137 in communication with the second discharge space are vane mounting holes 124h formed in the first cylinder 121 (shown in FIG. 5). It is formed in the inner diameter of the 2nd cylinder 131 so that it may also be located in the same position as FIG. 5, the suction port 126 (shown in FIG. 5), and the discharge port 127: shown in FIG.

7 is a view illustrating a vane installation structure of the rotary twin compressor according to the present invention. The integrated vane B is installed over the first and second cylinders 121 and 131, and the first vane part B1 and the second cylinder 131 located in the vane mounting hole 124h of the first cylinder 121. The second vane part B2 and the first and second vane parts B1 and B2 positioned in the vane mounting hole 134h are connected to each other in an axial direction. Of course, the first and second vanes B1 and B2 are formed in a radial direction shorter than the radial lengths of the respective vane mounting holes 124h and 125h so as to be movable in the radial direction. The two vanes B1 and B2 form curved surfaces that contact the first and second rollers 122 and 132 to reduce the contact area and to move smoothly.

At this time, the integrated vane (B) is a mounting groove (Bh) is seated elastic member (S) is seated in the center of the outer peripheral surface of the connection portion (B3) to be elastically supported on the inner surface of the sealed container 101 by one elastic member (S) ), And the integrated vane B has a top dead center point at which the first and second vanes B1 and B2 protrude from the inside of the vane mounting holes 124h and 134h of the first and second cylinders 121 and 131. TDC: Top dead center and reciprocating linear motion between bottom dead center (BDC: Bottom dead center) which is a point seated in the vane mounting holes (124h, 134h) of the first and second cylinders (121, 131). In addition, the integrated vane B is opposite to the mounting groove Bh, that is, the connection portion B3 so that the first and second vanes B1 and B2 are not interfering with the intermediate plate 140 even when the first and second vanes B1 and B2 are positioned at the top dead center TDC. The anti-interference groove BH may be provided at the center of the inner circumferential surface, or the connecting portion B3 may be formed to connect the outer circumferential side of the first and second vanes B1 and B2 as a whole. Of course, the connection part B3 may further reduce the leakage of the refrigerant by allowing the first and second vane parts B1 and B2 to be coupled with each other by the intermediate plate 140.

On the other hand, the elastic member (S) may be used a kind of coil spring, between the mounting groove (Bh) of the connecting portion (B3) and the inner surface of the sealed container 101 to elastically support the integral vane (B) in the radial direction. Is installed on.

Looking at the installation process of the integrated vane B and the elastic member S as described above, the first and second vane portions B1 and B2 in the vane mounting holes 124h and 134h of the first and second cylinders 121 and 131, respectively. Is fitted so that one end of the elastic member (S) is supported by the mounting groove (Bh) of the connecting portion (B3) and the other end of the elastic member (S) is supported on the inner side of the sealing container (101). .

Looking at the operation of the rotary twin compressor 100 is applied, such as the vane (B) as described above, as the rotary shaft 113 is rotated, the first and second eccentric portions 122 and 132 are rotated, the first and second rollers The volume of the suction area S and the discharge area D inside the first and second cylinders 121 and 131 changes as the 123 and 133 rolls along the inside of the first and second cylinders 121 and 131. At this time, the integrated vane (B) is elastically supported by the elastic member (S) while maintaining the contact with the first and second rollers (122, 132) inside the first and second cylinders (121, 131), respectively, the suction area (S) and The vane B also has a top dead center (TDC) and a bottom dead center in the radial direction while the first and second rollers 123 and 133 are rolled once inside the first and second cylinders 121 and 131. One round trip linear movement between (BDC).

At this time, when the first roller 123 is rolled along the inside of the first cylinder 121, the suction region S of the first cylinder 121 gradually widens and the pressure decreases, so that the first inlet pipe 151 and the suction port are reduced. As the refrigerant is sucked through 126 and the discharge area D of the first cylinder 121 becomes narrow and the pressure increases, the compressed refrigerant is discharged through the discharge port 127 and the first discharge space. Of course, the same compression action is also performed inside the second cylinder 131 as in the inside of the first cylinder 121, but the compression process is repeated once each time the rotating shaft 113 rotates one half, half of the total amount of refrigerant. Each of them is compressed in the first and second cylinders 121 and 131.

As such, the rotary twin compressor 100 not only has the same phase but also applies the integrated vane B having the first and second vanes B1 and B2 operated in the same direction, so that the integrated vane B At the same time, as it is operated in contact with the first and second rollers 123 and 132, a gap is formed between the integrated vane B and the first and second rollers 123 and 132, and the refrigerant is between the suction area S and the discharge area D. Operation failure such as leakage can be reduced, and even if the integrated vanes B are moved in the radial direction, the first and second vanes B1 and B2 are vane mounting holes 124h and 134h of the first and second cylinders 121 and 131. Since the connection portion B3 is engaged with the intermediate plate 140 while being moved from the inside, leakage of the refrigerant can be reduced.

In the foregoing, the present invention has been described in detail by way of examples on the basis of the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

1 is a view showing an example of a conventional rotary two-stage high pressure compressor.

2 is a view showing an example of a conventional rotary two-stage low pressure compressor.

Figure 3 is a view showing the vane installation structure of a conventional rotary two-stage compressor.

4 is a view showing an example of a rotary twin compressor according to the present invention.

5 shows an example of a first compression assembly of a rotary twin compressor according to the invention from below;

6 shows an example of a second compression assembly of a rotary twin compressor according to the invention from the top.

7 is a view showing a vane installation structure of the rotary twin compressor according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

110: electric motor 120: first compression assembly

130: second compression assembly 140: intermediate plate

151: first inflow pipe 152: second inflow pipe

153: outflow pipe B: integral vane

S: elastic member

Claims (4)

chest; A rotating shaft which is provided in the sealed container and supplies oil while transmitting rotational force; A first compression assembly including a first cylinder into which the refrigerant is sucked in accordance with rotation of the rotary shaft, and a first roller configured to compress the refrigerant while rolling along the inside of the first cylinder; A second compression assembly including a second cylinder into which the refrigerant is sucked in accordance with the rotation of the rotary shaft, and a second roller configured to compress the refrigerant while rolling along the inside of the second cylinder; A unitary vane disposed radially movable in the first and second cylinders so as to contact the first and second rollers, and partitioning the first and second cylinder inner spaces into suction and discharge regions through which refrigerant is sucked and discharged; And, And a resilient member for elastically supporting the integral vanes in the moving direction. The method of claim 1, The first and second cylinders each include a vane mounting hole with an inner diameter side open. The integrated vane includes a first vane part seated in the vane mounting hole of the first cylinder, a second vane part seated in the vane mounting hole of the second vane part, and a connection part connecting the first and second vane parts in an axial direction. Rotary twin compressor, characterized in that. The method of claim 2, The rotary twin compressor further includes an intermediate plate installed to partition between the first and second cylinders, The integrated vane further comprises an interference preventing groove at a connection adjacent to the intermediate plate. The method of claim 2, The integrated vane further comprises a mounting groove in which the elastic member is seated in the radial direction at the connection portion on the side opposite to the first and second rollers.

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