KR100839957B1 - Rotary compressor - Google Patents

Abstract

A rotary compressor is provided to prevent deterioration of compression efficiency or space utilization caused by re-expansion of compressed refrigerant remaining in a cylinder by removing or minimizing the refrigerant by a remaining gas discharge part. A rotary compressor includes a casing, a driving motor coupled with the casing at a side of the casing, a cylinder(120) coupled with the casing at the other side thereof and having a groove(123) in the shape of half moon, a rotational shaft(130) coupled with the driving motor for transmitting the rotational force of the driving motor, a rolling piston(140) eccentric from the rotational shaft and rotating in the cylinder for compressing compression gas, and a vane(150) mounted to the cylinder for contacting the rolling piston and formed with a remaining gas discharging part(160) to be engaged with the groove at a top dead point of the vane.

Description

Rotary compressors {ROTARY COMPRESSOR}

1 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention,

FIG. 2 is a cross-sectional view taken along the line “II-II” of FIG. 1;

3 is an enlarged cross-sectional view of the main part of FIG.

4A and 4B are cross-sectional views for explaining the operating state of the present invention.

Explanation of symbols on the main parts of the drawings

100: rotary compressor 103: casing

105: refrigerant inlet 107: refrigerant outlet

110: drive motor 111: stator

113: rotor 120: cylinder

121: vaneslit 123: half moon groove

130: rotation axis 131: eccentric portion

140: rolling piston 150: vane

151: elastic member receiving groove 160: residual gas discharge portion

161: contact surface 170: bearing

171: upper bearing 173: lower bearing

180: elastic member

The present invention relates to a rotary compressor, and more particularly, to a rotary compressor having an improved structure for discharging a refrigerant gas.

Generally, the air conditioner is driven in the heating mode and the cooling mode at the request of the user. Warms the room in the heating mode in cold winters and cools the room in the cooling mode in hot summers. In addition, it regulates the humidity of the room, and controls the air in a comfortable clean state.

In general, an air conditioner includes an indoor unit equipped with an indoor heat exchanger and an indoor fan that cools or heats a room, and an outdoor unit having an outdoor heat exchanger, an outdoor fan, a rotary compressor, and the like.

The heating cycle in the heating mode first compresses the refrigerant in the rotary compressor. The compressed refrigerant may be supplied to an indoor heat exchanger, and warm air may be released to the indoor side by heat exchange to keep the room warm.

The cooling cycle by the cooling mode first compresses the refrigerant in the rotary compressor. The compressed refrigerant may be supplied to an outdoor heat exchanger, and cold air may be discharged to the indoor side by heat exchange to keep the indoor cold. Then, the refrigerant passing through the room is supplied to the outdoor heat exchanger.

In this cooling and heating process, the rotary compressor repeats the compression process through the refrigerant, and in the air conditioner, the compression, condensation, expansion, and evaporation processes are continuously performed.

In general, a rotary compressor includes a drive shaft rotated by a change in magnetic flux between a stator and a rotor, a rolling piston coupled to an eccentric portion of the drive shaft and rotated in an inner space of the cylinder according to the rotation of the drive shaft, and radially at one side of the cylinder. It is inserted so as to be capable of linear reciprocating movement, and its end is in line contact with the outer circumferential surface of the rolling piston and includes a vane for converting the space formed by the inner circumferential surface of the cylinder and the outer circumferential surface of the rolling piston into a compression chamber and a discharge chamber. The vanes are housed in a vane chamber formed on one side of the cylinder to allow access to the rolling piston. The cylinder is formed with a half moon groove communicating with the discharge port, and the compressed refrigerant gas is discharged through the discharge port.

However, according to the related art, when the compressed gas is discharged from the cylinder, the refrigerant may not be discharged by the vandal groove or the like and may be re-expanded into the cylinder. Therefore, the prior art has a problem that the efficiency of the compressor is lowered by lowering the volumetric efficiency or compression efficiency of the compressor.

It is therefore an object of the present invention to provide a rotary compressor capable of minimizing residual refrigerant gas inside a cylinder.

Another object of the present invention is to provide a rotary compressor which can reduce the compression loss of the compressor.

According to the present invention, there is provided a rotary compressor comprising: a casing; A driving motor provided at one side of the casing and coupled to the casing; A cylinder provided on the other side of the casing, coupled to the casing, and having a half moon groove; A rotating shaft coupled to the driving motor to transmit a rotational force of the driving motor; A rolling piston provided eccentrically from the rotating shaft to rotate the inside of the cylinder and to compress the refrigerant gas; A vane disposed in the cylinder and disposed in the cylinder to be in contact with the rolling piston; The vane is achieved by a rotary compressor, characterized in that the vane is formed with a residual gas discharge portion engaging the vandal groove at the top dead center.

The residual gas discharge portion may extend in a direction in which the rolling piston rotates at an end of the vane to approach the vane.

The residual gas discharge part may be provided in a shape corresponding to the vandal groove.

The residual gas discharge part may be formed at an upper end of the vane.

The vandal groove may be connected to the discharge port.

Hereinafter, a rotary compressor according to the present invention will be described with reference to the accompanying drawings. Rotary compressors are used in a variety of electronic devices such as air conditioners, including ceiling type, window recessed type, indoor stand type, and the like.

As shown in Figures 1 to 3, the rotary compressor 100 according to an embodiment of the present invention, the casing 103, the drive motor 110, the cylinder 120, the rotary shaft 130 and And a rolling piston 140, a vane 150, and a residual gas discharge unit 160. The rotary compressor 100 may further include a bearing 170 and an elastic member 180. Rotary compressor 100 may further include an accumulator (not shown) having a gas-liquid separator (not shown). The rotary compressor 100 sucks and compresses the refrigerant evaporated in the evaporator (not shown) to increase the pressure, thereby making it possible to liquefy (the gas becomes liquid) even at a relatively high temperature.

The casing 103 forms the external appearance of the rotary compressor 100. The casing 103 includes a refrigerant discharge port 107 coupled to the upper portion to discharge the compressed high pressure refrigerant, and a refrigerant suction port 105 communicating with the cylinder 120 to guide the refrigerant to the cylinder 120.

The drive motor 110 includes a stator 111 that receives a power source to form a magnetic field, and a rotor 113 disposed corresponding to the stator 111 and coupled to the rotating shaft 130.

The cylinder 120 is formed so that compressed refrigerant enters and exits a lower region of the casing 103. The cylinder 120 may communicate with the discharge valve 172a to discharge the refrigerant from the cylinder 120. The cylinder 120 is in communication with the refrigerant inlet 105 to inhale the refrigerant. The rolling piston 140 is disposed to eccentrically rotate inside the cylinder 120.

The cylinder 120 includes vane slits 121 disposed on the vanes 150. The cylinder 120 has a recessed half moon groove 123 communicating with the discharge port 172b. The cylinder 120 has an elastic member accommodating part 125 in which the elastic member 180 for pressing the vane 150 toward the rolling piston 140 is accommodated. Vandal groove 123 is formed in the upper portion of the cylinder 120 to communicate with the discharge port (172b).

The recessed cross-sectional shape of the half moon groove 123 is the same as the quarter divided into one embodiment, but may have a variety of shapes differently.

The rotating shaft 130 is provided in an elongated rod shape to transmit the rotational force of the rotor 113 to the rolling piston 140. The rotating shaft 130 includes an eccentric portion 131 protruding eccentrically from the center of the shaft to a portion coupled with the rolling piston 140.

The load generated as the rotary shaft 130 rotates is supported by the upper bearing 171 and the lower bearing 173.

The eccentric portion 131 is provided below the rotating shaft 130 and coupled to the inner circumferential surface of the rolling piston 140.

The rolling piston 140 is coupled to the eccentric portion 131 of the rotating shaft 130 and rotates together with the eccentric portion 131 according to the rotation of the rotating shaft 130, and in contact with the vane 150 in the process of rotating the cylinder 120 may be divided into a compression chamber and a suction chamber.

The vane 150 is coupled to the vane slit 121 of the cylinder 120 so that the vane 150 can linearly reciprocate while being spaced from a proximity or rotation axis of the rotation shaft 130. The vane 150 has an end thereof in contact with the outer circumferential surface of the rolling piston 140 and divides the inside of the cylinder 120 into a compression chamber and a discharge chamber. The vane 150 includes a residual gas discharge unit 160 in an area in contact with the rolling piston 140. Here, the vanes 150 move between the top dead center and the bottom dead center, and the state in which the vanes 150 reaches the top dead center is shown in FIG. 4B, and the state in which the vanes 150 reaches the bottom dead center is shown. As shown in Figure 4a.

The vane 150 has an elastic member receiving groove 151 to which the elastic member 180 is coupled such that the vane 150 is pressed toward the rolling piston 140.

The residual gas discharge unit 160 has a shape in which the vane 150 is engaged with the half moon groove 123 when the vane 150 reaches the top dead center. The residual gas discharge unit 160 extends in the region where the vanes 150 are in contact with the rolling piston 140, and the vandal groove 123 when the rolling piston 140 rotates to reach the top dead center. ) Function to prevent or minimize residual gas.

The residual gas discharge unit 160 has a contact surface 161 in contact with the rolling piston 140. The contact surface 161 is in contact with the rolling piston 140 and the radius of curvature that minimizes the refrigerant remaining between the half moon groove 123 and the residual gas discharge unit 160 when the rolling piston 140 reaches the top dead center. Can have

Accordingly, the amount of the refrigerant remaining in the compression chamber may be eliminated or minimized, and the compression efficiency and the volume efficiency of the cylinder 120 may be improved. Therefore, the efficiency of the rotary compressor 100 can be improved.

The bearing 170 supports the load generated by the rotation of the rotor 113 and the rotating shaft 130. The bearing 170 includes an upper bearing 171 and a lower bearing 173.

The upper bearing 171 is coupled with the rotating shaft 130 between the rotor 113 and the cylinder 120. A discharge port 172b communicating with the vandal groove 123 penetrates the upper bearing 171, and a discharge valve 172a disposed at an end of the discharge port 172b is coupled.

The lower bearing 173 supports the rotation shaft 130 under the cylinder 120.

The elastic member 180 elastically presses the vanes 150 toward the rolling piston 140. The elastic member 180 is accommodated in the elastic member receiving groove 151 of the vane 150 and the elastic member receiving portion 125 of the cylinder 120. Accordingly, the vanes 150 may stably move linearly from the vaneslit 121 toward the rolling piston 140.

With this configuration, the operation of the rotary compressor 100 according to an embodiment will be described with reference to FIGS. 4A and 4B as follows.

First, when power is applied to the stator 111, the rotor 113 rotates. As the rotor 113 rotates, the rotating shaft 130 coupled to the rotor 113 rotates, and the rolling piston 140 coupled to the eccentric portion 131 of the rotating shaft 130 moves inside the cylinder 120. Eccentric rotation.

Here, as shown in FIG. 4A, the 'A' region on the left side of the cylinder 120 serves as a suction chamber, and the refrigerant is sucked through the refrigerant suction port 105 as the rolling piston 140 rotates. On the other hand, the 'B' region on the right side of the cylinder 120 serves as a compression chamber, and the refrigerant is compressed as the rolling piston 140 rotates.

By the eccentric rotation of the rolling piston 140, the refrigerant is sucked through the refrigerant suction port 105 and compressed to a predetermined pressure. Thus, when the pressure of the compression chamber inside the cylinder 120 becomes higher than the pressure in the casing 103, the refrigerant is discharged through the refrigerant discharge port 107 through the discharge port 172b.

Here, some of the compressed refrigerant may remain in the half moon groove 123 of the cylinder 120, but as shown in FIG. 4B, the vane 150 reaches the top dead center as soon as the vane 150 reaches the top dead center. Residual gas outlet 160 is engaged. The refrigerant compressed in the compression chamber may be discharged through the discharge port 172b without remaining in the cylinder.

Therefore, it is possible to eliminate or minimize the residual refrigerant gas in the cylinder to prevent the reduction in compression efficiency or space efficiency caused by the re-expansion of the refrigerant remaining compressed. In addition, the compression loss of the compression chamber can be reduced and the efficiency of the rotary compressor can be improved.

The vandal groove and the residual gas discharge part of the rotary compressor according to the present invention may be changed into various shapes within a range capable of achieving the technical idea of the present invention, unlike one embodiment.

As described above, according to the present invention, a decrease in compression efficiency or space efficiency can be prevented.

In addition, the compression loss of the compression chamber can be reduced and the efficiency of the rotary compressor can be improved.

Claims (5)

In a rotary compressor, Casing; A driving motor provided at one side of the casing and coupled to the casing; A cylinder provided on the other side of the casing, coupled to the casing, and having a half moon groove; A rotating shaft coupled to the driving motor to transmit a rotational force of the driving motor; A rolling piston provided eccentrically from the rotating shaft to rotate the inside of the cylinder and to compress the refrigerant gas; A vane disposed in the cylinder and in contact with the rolling piston and moving between a top dead center and a bottom dead center; The vane is a rotary compressor, characterized in that the vane is formed with a residual gas discharge portion engaging the vandal groove at the top dead center. The method of claim 1, And the residual gas discharge portion extends in a direction in which the rolling piston rotates and approaches the vane at an end of the vane. The method of claim 2, And the residual gas discharge part is provided to be accommodated in the vandal groove at the top dead center. The method of claim 1, The residual gas discharge unit is a rotary compressor, characterized in that the vane is formed at the end of the vane in contact with the rolling piston. The method of claim 1, The vandal groove is a rotary compressor, characterized in that connected to the discharge port.

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