KR101337082B1 - Rotary compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly, to a rotary compressor that can be compressed at a high pressure by partitioning one space and allowing continuous multistage compression to be performed therein.

Rotary compressor according to the present invention is a sealed container; A rotating shaft provided in the sealed container and transmitting a rotational force; A cylinder fixed in the sealed container and into which the refrigerant enters and exits; A roller which is eccentrically connected to the rotating shaft and forms a compression space therebetween while rotating the cylinder inner diameter according to the rotation of the rotating shaft; At least two vanes separating at least two compression spaces between the cylinder and the roller; In addition, the connection flow path for communicating at least two or more compression spaces; it is possible to increase the compression efficiency by reducing the friction loss.

Description

Rotary Compressor {ROTARY COMPRESSOR}

1 is a view showing an example of a conventional rotary twin compressor.

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

Figure 3 is a schematic diagram showing an example of a cycle including a rotary compressor according to the present invention.

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

5 shows an example of a compression assembly applied to FIG. 4.

6 is a view showing another example of a rotary compressor according to the present invention;

7 shows another example of a compression assembly applied to FIG. 6.

8 is a graph showing the efficiency of the rotary compressor according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100: rotary compressor 110: electric motor

120: compression assembly 121: cylinder

122: eccentric portion 123: roller

124a: low pressure inlet 124b: low pressure outlet

124c: High pressure inlet 124d: High pressure outlet

125: first vane 126: first elastic member

127: second vane 128: second elastic member

130: lower bearing 140: upper bearing

151: lower cover 152: upper cover

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly, to a rotary compressor that can be compressed at a high pressure by partitioning one space and allowing continuous multistage compression to be performed therein.

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 that compresses the refrigerant while rotating the orbiting scroll along the fixed scroll so that a compression space in which the working gas is sucked and discharged is formed between the orbiting scroll and the fixed scroll, ).

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.

Korean Patent Publication No. 10-2005-0062995 discloses a rotary twin compressor. Referring to FIG. 1, two cylinders 1035 and 1045 and an intermediate plate 1030 which compress the same capacity are provided, and the compression capacity is improved by twice compared to the first stage compressor.

Republic of Korea Patent Publication No. 10-2007-0009958 discloses a rotary two-stage compressor. Referring to FIG. 2, the compressor 2001 includes an electric motor 2014 having a stator 2007 and a rotor 2008 above an inside of a sealed container 2013, and two rotary shafts 2002 connected to the electric motor are provided. Eccentricity is provided. The main bearing 2009, the high pressure compression element 2020b, the intermediate plate 2015, the low pressure compression element 2020a and the sub bearing 2019 are laminated in order from the electric motor 2014 side with respect to the rotating shaft 2002. . Also disclosed is an intermediate tube 2040 for introducing refrigerant compressed in the low pressure compression element 2020a into the high pressure compression element 2020b.

As described above, the rotary two-stage compressor according to the prior art is provided with a high pressure compression element, a low pressure compression element, an intermediate tube, etc. to form different compression spaces, so that not only the components are complicated but also the product size increases. Since mechanical frictional losses are generated between the cylinder and the eccentric portion in the high pressure compression element and the low pressure compression element, respectively, there is a problem that the compression efficiency due to the mechanical friction loss is reduced.

The present invention has been made to solve the above problems of the prior art, an object of the present invention is to provide a rotary compressor that can reduce the components even if the continuous compression is made.

It is also an object of the present invention to provide a rotary compressor that can reduce mechanical frictional losses even if continuous compression is made.

According to an aspect of the present invention, A rotating shaft provided in the sealed container and transmitting a rotational force; A cylinder fixed in the sealed container and into which the refrigerant enters and exits; A roller which is eccentrically connected to the rotating shaft and forms a compression space therebetween while rotating the cylinder inner diameter according to the rotation of the rotating shaft; At least two vanes separating at least two compression spaces between the cylinder and the roller; And a connection flow passage communicating at least two compression spaces.

In addition, the cylinder is provided with a plurality of vane mounting groove in the inner diameter so that the vanes can be mounted, respectively, the vane provides a rotary compressor characterized in that the spring is elastically supported in the vane mounting grooves.

In addition, the cylinder includes a low pressure suction port, a low pressure discharge port, a high pressure suction port, and a high pressure discharge port formed along an inner diameter, and the vanes are provided with a first vane, a low pressure discharge port, and a high pressure installed to partition between the low pressure suction port and the high pressure discharge port. It provides a rotary compressor comprising a second vane installed to partition between the suction inlet.

In addition, the low pressure discharge port, the high pressure suction port, the high pressure discharge port provides a rotary compressor, characterized in that provided with a valve for controlling the access of the refrigerant according to the pressure difference.

In addition, the low pressure suction port and the high pressure discharge port is provided in close proximity, the low pressure suction port and the high pressure suction port is provided in close proximity provided a rotary compressor.

In addition, the first vane and the second vane are installed so that the volume of the high pressure compression space formed between the high pressure suction port and the high pressure discharge port is smaller than the volume of the low pressure compression space formed between the low pressure suction port and the low pressure discharge port. Provides a rotary compressor.

In addition, the first vane and the second vane provides a rotary compressor, characterized in that the volume ratio of the high pressure compression space to the volume of the low pressure compression space is maintained from 0.53 to 0.83.

In addition, the connection passage provides a rotary compressor, characterized in that the inner diameter is formed larger than the inner diameter of the low pressure suction port.

In addition, the connection flow passage may include a bearing in communication with the low pressure discharge port and the high pressure suction port; And, coupled to the bearing to form a low pressure discharge space; provides a rotary compressor comprising a.

In addition, the bearing and the lower cover provides a rotary compressor, characterized in that coupled to one surface of the upper or lower cylinder.

In addition, the connection flow passage is provided with a communication groove for communicating between the low pressure discharge port and the high pressure suction port, and provides a rotary compressor, characterized in that the connection plate is coupled to one surface of the upper or lower surface of the cylinder.

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

3 is a schematic diagram showing an example of a cycle including a rotary compressor according to the present invention. The heating cycle includes components such as rotary compressor 100, condenser 300, evaporator 400, phase separator 500, and four-way valve 600. The condenser 300 constitutes an indoor unit, and the compressor 100, the evaporator 400, and the phase separator 500 constitute an outdoor unit. The refrigerant compressed in the compressor 100 flows into the condenser 300 of the indoor unit through the four-way valve 600, and the compressed refrigerant gas is heat-exchanged with the ambient and condensed. The condensed refrigerant passes through the expansion valve and becomes low pressure. The refrigerant passing through the expansion valve is separated into gas and liquid in the phase separator 500, and the liquid flows into the evaporator 400. The liquid is evaporated by heat exchange in the evaporator 400, and is introduced into the accumulator 200 in a gaseous state, and is introduced into the low pressure compression assembly (not shown) through the refrigerant inlet pipe 102 of the compressor 100 in the accumulator 200. do. In addition, the gas separated in the phase separator 500 is introduced into the compressor 100 through the injection tube 104. The medium pressure refrigerant compressed by the low pressure compression assembly of the compressor 100 and the refrigerant introduced through the injection tube 104 are introduced into the high pressure compression assembly (not shown) of the compressor 100 and compressed to high pressure. The discharge pipe 103 is discharged to the outside of the compressor 100 again.

4 is a view showing an example of a rotary compressor according to the present invention, Figure 5 is a view showing an example of the compression assembly applied to FIG. The rotary compressor according to the first embodiment of the present invention includes an electric motor 100 and a compression assembly 120 in the sealed container 101. In addition, the refrigerant inlet tube 102 and the refrigerant discharge tube 103 are installed to penetrate the sealed container 101, the refrigerant inlet tube 102 is connected to the accumulator, and the refrigerant discharge tube 103 is the sealed container 101. The compressed refrigerant in the inside) is discharged to the outside of the sealed container 101.

First, the motor 110 includes a stator 111, a rotor 112, and a rotation 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 axis of rotation 113 extends from the rotor 112 to the compression assembly 120.

Next, the compression assembly 120 is divided into a low pressure compression space (P1) and a high pressure compression space (P2), the lower bearing 130 and the upper bearing 140 is installed on the lower and upper, respectively, such a lower bearing 130 ) And the upper bearing 140 not only assist the rotation of the rotary shaft 113 but also support the load of the compression assembly 120.

In more detail, the compression assembly 120 includes a cylinder 121, an eccentric portion 122, a roller 123, a plurality of inlets 124a and 124c and outlets 124b and 124d, first vanes 125 and a first one. The first elastic member 126, the second vane 127, and the second elastic member 128 are included. Of course, the eccentric portion 122 may be formed integrally with the rotary shaft 113, the roller 123 is rotatably installed on the eccentric portion 122, the roller 123 is rotated in accordance with the rotation of the rotary shaft 113 It rotates while rolling along the inner diameter of the cylinder 121.

At this time, in order to form a low pressure compression space (P1) and a high pressure compression space (P2) between the cylinder 121 and the roller 123, the low pressure suction port 124a formed in the inner diameter of the cylinder 121, the inner diameter of the cylinder 121 And a low pressure discharge port 124b and a high pressure suction port 124c respectively formed over the lower end, and a high pressure discharge port 124d formed over the inner diameter and the upper end of the cylinder 121, respectively, on both sides of the first vane 125. The low pressure suction port 124a and the high pressure discharge port 124d are formed, and the low pressure discharge port 124b and the high pressure suction port 124c are formed on both sides of the second vane 127. That is, the space in the cylinder 121 is partitioned between the roller 123 and the first and second vanes 125 and 127 so that the refrigerant before and after compression coexists in the low pressure compression space P1 or the high pressure compression space P2. In this case, the refrigerant before and after compression coexist.

Of course, since the low pressure refrigerant is compressed in the low pressure compression space (P1) and then further compressed in the high pressure compression space (P2), the low pressure compression space (P1) should be configured wider than the high pressure compression space (P2). For this reason, it is preferable that the internal angle between the low pressure suction port 124a and the low pressure discharge port 124b is larger than the internal angle between the high pressure suction port 124c and the high pressure discharge port 124d.

In addition, in order to reduce the dead volume in the low pressure compression space (P1) and the high pressure compression space (P2), the low pressure inlet 124a and the high pressure discharge port 124d divided by the first vane 125 are installed close to each other. In addition, the low pressure discharge port 124b and the high pressure discharge port 124d divided by the second vane 127 are also preferably installed in close proximity to each other. At this time, the first vane 125 is installed to be elastically supported by the first elastic member 126 in the slit-shaped first vane mounting hole 125h formed between the low pressure suction port 124a and the high pressure discharge port 124d. The second vane 127 is also installed to be elastically supported by the second elastic member 128 in the slit-shaped second vane mounting hole 127h formed between the low pressure discharge port 124b and the high pressure discharge port 124d. The first and second elastic members 126 and 128 are means for applying a force to the first and second vanes 125 and 127 so that the first and second vanes 125 and 127 maintain contact with the roller 123. It is preferable to be installed to support the two vanes (125, 127), respectively.

Next, the lower bearing 130 has a lower cover 151 coupled to the lower portion, and the refrigerant discharged from the low pressure discharge port 124b between the lower bearing 130 and the lower cover 151 to the high pressure inlet 124c. As a space temporarily stored before being introduced, a low pressure discharge space D1 serving as a kind of connection flow path or a buffer space is provided. In addition, the lower bearing 130 is formed with a suction passage 131 through which the low pressure discharge port 124b and the low pressure discharge space D1 communicate with each other, and the low pressure discharge valve is opened and closed by a pressure difference on the suction passage 131. 132 is provided, the discharge passage 133 is formed in communication with the high pressure suction port 124c and the high pressure discharge space (D2), the high pressure suction valve is also opened and closed on the discharge passage 133 by a pressure difference 134 is provided.

At this time, the refrigerant flowing into the low pressure inlet 124a has a relatively low pressure, while the refrigerant discharged into the low pressure discharge space D1 through the low pressure discharge port 124b is primarily compressed to increase the pressure of the refrigerant. In consideration of this, it is preferable that the inner pressure of the low pressure discharge space D1 is larger than the inner diameter of the low pressure suction port 124a or the inner diameter of the refrigerant inlet pipe 102.

Next, the upper bearing 140 has an upper cover 152 coupled to the upper portion, and a high pressure discharge space D2 communicating with the high pressure discharge port 124d between the upper bearing 140 and the upper cover 152 is provided. . In addition, the upper bearing 140 has a discharge passage 141 through which the high pressure discharge port 124d and the high pressure discharge space D2 communicate with each other, and the upper cover 152 has an airtight container from the high pressure discharge space D2 on its upper surface. The discharge port 153 discharged to the inside 101 is provided. Of course, the high-pressure refrigerant passing through the discharge port 153 of the upper cover 152 is discharged to the outside through the refrigerant discharge pipe 103 located on the upper portion of the sealed container 101.

Of course, the high pressure discharge space (D2) is provided on the lower bearing 130 side, the low pressure discharge space (D1) may be provided in various ways to be provided on the upper bearing 140 side.

Looking at the operation of the rotary compressor configured as described above, the eccentric portion 122 is rotated by the rotation of the rotary shaft 113 as the electric motor 110 is operated, the roller 123 is along the inner diameter of the cylinder 121 1 While rotating and sucking the refrigerant in the low pressure compression space (P1) to compress first, and then the refrigerant compressed primarily in the high pressure compression space (P2) is further compressed and discharged to a high pressure state.

First, when the roller 123 is rolled along the inner diameter of the cylinder 121 between the low pressure suction port 124a and the low pressure discharge port 124b, the roller 123 is formed between the cylinder 121 and the roller 123 and the first vane 125. As the inlet volume of the low pressure compression space P1 increases, the pressure becomes low, and the refrigerant flows in through the low pressure inlet 124a. On the other hand, the refrigerant is compressed while the volume of the discharge portion of the low pressure compression space P1 formed between the cylinder 121, the roller 123, and the second vane 127 is reduced, and the compressed refrigerant opens the low pressure discharge port 124b. It discharges to the low pressure discharge space D1 through. Of course, the low pressure discharge valve 132 is opened and closed by the pressure difference between the pressure of the discharge portion of the low pressure compression space (P1) and the low pressure discharge space (D1).

On the other hand, when the roller 123 is rolled along the inner diameter of the cylinder 121 between the high pressure suction port 124c and the high pressure discharge port 124d, it is formed between the cylinder 121 and the roller 123 and the second vane 127. As the inlet volume of the high pressure compression space P2 increases, the pressure becomes low, and the refrigerant flows through the high pressure inlet 124c. Of course, the high-pressure intake valve 134 is opened and closed by the pressure of the low pressure discharge space (D1) and the inlet pressure difference of the high pressure compression space (P2). On the other hand, as the volume of the discharge portion of the high pressure compression space P2 formed between the cylinder 121 and the roller 123 and the first vane 125 decreases, the refrigerant is further compressed, and the compressed refrigerant further discharges the high pressure. It discharges to the high pressure discharge space D2 via 124d. Of course, the high pressure discharge valve 142 is opened and closed by the pressure difference between the pressure of the discharge portion of the high pressure compression space (P2) and the high pressure discharge space (D2).

6 is a view showing another example of a rotary compressor according to the present invention, Figure 7 is a view showing another example of the compression assembly applied to FIG. Rotary compressor according to the second embodiment of the present invention is formed in the same manner as the first embodiment, the refrigerant compressed in the low pressure compression space (P1) on the compression assembly 120 side of the high pressure compression space of the compression assembly 120 A kind of connection flow path leading to P2 is configured as one connection plate 230.

At this time, the connecting plate 230 is provided with a communication groove 231 for communicating a low pressure discharge port 124b communicating with the low pressure compression space (P1) and a high pressure suction port (124c) communicating with the high pressure compression space (P2) on one surface. The connecting plate 230 may be coupled to one surface of the upper or lower surface of the cylinder 121, but the lower bearing may be omitted, and the connecting plate 230 may be coupled to the lower surface of the cylinder 121.

Of course, while the refrigerant flowing into the low pressure inlet 124a has a relatively low pressure, the refrigerant discharged into the connection groove 231 through the low pressure discharge port 124b is primarily compressed, so that the pressure of the refrigerant is relatively high. In consideration of the above, it is preferable that the inner diameter of the connecting groove 231 is larger than the inner diameter of the low pressure suction port 124a or the inner diameter of the refrigerant inlet pipe 102.

In addition, the components of the second embodiment are the same as those of the first embodiment, and the detailed description thereof will be omitted since the operation state is the same.

8 is a graph showing the efficiency of the rotary compressor according to the present invention. The efficiency of the rotary compressor according to the present invention can be seen that the volume ratio of the high pressure compression space to the volume of the low pressure compression space is higher than 93% within the range of 0.53 to 0.83. As such, each volume of the low pressure compression space and the high pressure compression space in the cylinder is determined by the installation positions of the first and second vanes, and in order to match the volume ratio of the high pressure compression space to the volume of the low pressure compression space as described above. The interior angle of the first and second vanes is preferably determined within a range of 90 ° to 170 °.

In the above, the present invention has been described in detail by taking a rotary compressor equipped with a low pressure compression space and a high pressure compression space based on 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.

In the rotary compressor according to the present invention configured as described above, since the refrigerant is multi-stage compressed in a space partitioned by one cylinder, a roller, and a plurality of vanes, not only the component parts but also the size of the product can be reduced. There is an advantage to this.

In addition, in the rotary compressor according to the present invention, even if only one roller is rotated once in one cylinder, since the compressor is multi-stage compressed along each compression space partitioned by a plurality of vanes and a connection flow path connecting them. It is an object of the present invention to provide a rotary compressor that can reduce mechanical frictional losses and thus increase compression efficiency.

Claims (11)

chest; A rotating shaft provided in the sealed container and transmitting a rotational force; A cylinder fixed in the sealed container and including a low pressure suction port, a low pressure discharge port, a high pressure suction port, and a high pressure discharge port formed along an inner diameter through which the refrigerant enters and exits; A roller which is eccentrically connected to the rotating shaft and forms a compression space therebetween while rotating the cylinder inner diameter according to the rotation of the rotating shaft; A first vane installed to partition between the low pressure suction port and the high pressure discharge port separating at least two compression spaces between the cylinder and the roller, and a second vane provided to partition between the low pressure discharge port and the high pressure suction port; And, And a connecting flow passage having an inner diameter communicating at least two compression spaces larger than an inner diameter of the low pressure suction port. The method of claim 1, The cylinder is provided with a plurality of vane mounting groove in the inner diameter so that the vanes can be mounted respectively, And the vanes are elastically supported in the vane mounting grooves by respective springs. The method of claim 1, Low pressure discharge port, high pressure inlet port, high pressure discharge port is a rotary compressor, characterized in that provided with a valve for controlling the inlet and out of the refrigerant according to the pressure difference. The method of claim 1, Low pressure suction port and high pressure discharge port are installed in close proximity, Rotary compressor characterized in that the low pressure suction port and the high pressure suction port is installed in close proximity. The method of claim 1, The first vane and the second vane are rotary type, characterized in that the volume of the high pressure compression space formed between the high pressure suction port and the high pressure discharge port is smaller than the volume of the low pressure compression space formed between the low pressure suction port and the low pressure discharge port. compressor. 6. The method of claim 5, The first vane and the second vane are rotary compressors, characterized in that the volume ratio of the high pressure compression space to the volume of the low pressure compression space is maintained from 0.53 to 0.83. The method of claim 1, The connection flow passage includes a bearing in communication with the low pressure discharge port and the high pressure suction port; And a lower cover coupled to the bearing to form a low pressure discharge space. The method of claim 7, wherein The bearing and the lower cover is a rotary compressor, characterized in that coupled to one surface of the upper or lower cylinder. The method of claim 1, The connecting flow path is provided with a communication groove for communicating between the low pressure discharge port and the high pressure suction port, the rotary compressor characterized in that the coupling plate is coupled to one of the upper or lower surface of the cylinder. delete delete

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