KR20150088037A - Closed type rotary compressor - Google Patents

Abstract

Provided is a closed-type rotary compressor which can change from a high-pressure closed-type rotary compressor into a low-pressure one, efficiently cool an electric unit, and have a reduced volume as an accumulator. The closed-type rotary compressor of the present invention comprises: a case for forming the exterior; an intake unit placed in the case for taking in low temperature refrigerant gas at a low pressure and oil; an electric unit placed on the top side in the case for generating power; a compressing unit placed on the bottom side of the case for receiving the power from the electric unit and compressing the refrigerant; a guiding pipe extended to the outside of the case for connecting the top and the bottom of the case, which is for guiding the low temperature refrigerant gas at a low pressure from among the refrigerant gas with a low temperature and a low pressure and the oil, which are taken in by the intake unit, to the compressing unit; a discharge unit for being guided to the compressing unit for discharging high temperature compressed refrigerant gas at a high pressure; and a top flange placed in between the electric unit and the compressing unit for letting the inside of the case be divided into the top, where the refrigerant gas at a low temperature and a low pressure exists, and the bottom, where the refrigerant gas at a high temperature and a high pressure exists, and be sealed.

Description

CLOSED TYPE ROTARY COMPRESSOR [0002]

The present invention discloses a low-pressure closed rotary compressor.

Generally, a compressor is a mechanical device that receives power from a power generating device such as an electric motor or a 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, Widely used.

[0003] When a compressor is broadly classified, a reciprocating compressor compresses a refrigerant while linearly reciprocating the piston in 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 reciprocating compressor compressing refrigerant between the rolling piston and the cylinder A rotary compressor for compressing the refrigerant while the rolling piston is eccentrically rotated along the inner wall of the cylinder so that a compression space in which the working gas is sucked and discharged is formed, and a compression space in which the working gas is sucked and discharged between the orbiting scroll and the fixed scroll So that the orbiting scroll is rotated along the fixed scroll to compress the refrigerant.

Most of the rotary compressors use high-pressure rotary compressors. In the case of a high-pressure rotary compressor, there is a problem that the efficiency of the electric units is deteriorated due to the high temperature of the electric units.

One aspect of the present invention provides a sealed rotary compressor in which a high-pressure type closed rotary compressor can be simply changed to a low pressure type.

A closed type rotary compressor capable of efficiently cooling the electric unit is also provided.

Further, the present invention provides an enclosed rotary compressor in which the accumulator is removed to reduce the volume.

A closed type rotary compressor according to an embodiment of the present invention includes a casing forming an outer casing, a suction unit provided in the casing for sucking refrigerant gas and low-temperature low-pressure refrigerant, an electric power unit provided on the upper side of the casing to generate power, A compression unit that is provided on the lower side of the case and compresses the refrigerant by receiving power from the transmission unit; a low-temperature and low-pressure refrigerant gas that is drawn to the outside of the case and communicates with the upper and lower portions of the case, Pressure refrigerant gas guided and compressed by the compression unit to the compression unit, and a discharge unit which is provided between the electric unit and the compression unit, Of the refrigerant gas in the upper portion and the refrigerant gas in the lower portion Separated by characterized in that it comprises a top flange to ensure sealing.

The case may include a body having a cylindrical shape with upper and lower portions opened, an upper cap coupled to an upper portion of the body, and a lower cap coupled to a lower portion of the body.

The suction portion may be provided on the upper cap, and the guide pipe may be provided so as to communicate an upper portion and a lower portion of the body portion, which is separated into upper and lower portions by the top flange.

The low-temperature low-pressure refrigerant gas and the low-temperature low-pressure refrigerant gas sucked into the suction portion are guided to the compression unit through the guide pipe, the low-temperature low-pressure oil falls down from the upper portion of the main body portion to the lower portion, .

The electromotive unit includes a stator fixed to the inside of the case, a rotor rotatably provided in the stator, and a rotor disposed inside the rotor to rotate together with the rotor, And may include a rotatable shaft that is received.

The top flange, the case, the stator, the case, the rotor, and the rotating shaft may be fixed by a bond, respectively.

The compression unit may include a plurality of cylinders having an internal space for compressing the low temperature and low pressure refrigerant gas, and a plurality of flanges provided between the plurality of cylinders to form the internal space together with the plurality of cylinders.

Wherein the plurality of cylinders includes a first cylinder fixed to the bottom of the top flange and a second cylinder disposed below the first cylinder, the plurality of flanges comprising the top flange, the first cylinder, A middle flange disposed between the cylinders, and a bottom flange disposed below the second cylinder.

Wherein the bottom flange is provided with an oil storage portion in which oil is stored, and a first oil returning hole and a second oil returning hole are provided in the top flange and the second cylinder, respectively, And can be moved to the oil reservoir through the oil recovery hole and the second oil recovery hole.

A first guide hole communicating with the first oil recovery hole to guide the oil moved through the first oil recovery hole to the second oil recovery hole, At least one third guide hole communicating with the second guide hole is provided in the middle flange and at least one third guide hole communicating with the second guide hole is provided in the middle flange, And at least one fourth guide hole communicating with the second oil recovery hole and guiding the oil to the second oil recovery hole may be provided.

Wherein a lower portion of the rotary shaft is received in the oil reservoir and an oil passage for guiding the oil stored in the oil reservoir between the rotary shaft and the top flange and between the plurality of cylinders and the plurality of flanges, And the oil stored in the oil reservoir may rise along the oil passage when the rotation shaft is rotated.

An oil supply hole for supplying oil raised along the oil flow path between the rotation shaft and the top flange and an oil splash hole for supplying oil raised along the oil flow path between the plurality of cylinders and the plurality of flanges, And the top flange may be provided with an oil groove for supplying the oil supplied to the oil supply hole between the top flange and the first cylinder and a communication portion for communicating the oil supply hole and the oil groove.

The communication portion may guide the oil supplied to the oil supply hole toward the lower side of the oil supply hole, and an oil-less bearing may be provided between the rotation shaft on the oil supply hole and the top flange.

The guide pipe may be provided so as to communicate with an upper portion and a lower portion of the body portion which are separated by the top flange from upper and lower portions, and the suction portion may be provided above the top flange at the upper portion of the body portion.

The low-temperature low-pressure refrigerant gas drawn into the suction portion and the low-temperature low-pressure refrigerant gas in the oil move upward, cool the electric unit, and are guided to the compression unit through the guide pipe, It can fall.

According to the embodiments of the present invention, the high temperature of the electromotive unit is prevented and the efficiency of the electromotive unit is improved, thereby improving the efficiency of the closed rotary compressor and reducing the overall volume of the closed rotary compressor.

1 illustrates a refrigeration cycle in accordance with an embodiment of the present invention.
2 is a sectional view of a closed rotary compressor according to an embodiment of the present invention;
3 is an internal exploded perspective view of a closed rotary compressor according to one embodiment of the present invention.
Fig. 4 is a view showing the flow of refrigerant gas and oil in Fig. 2; Fig.
5 illustrates a flow in which oil is recovered to an oil reservoir according to an embodiment of the present invention.
Fig. 6 is a view showing the flow of oil, which is stored in the oil reservoir in Fig. 2, used for lubricating by rising along the oil passage; Fig.
7 is a sectional view of a closed rotary compressor according to another embodiment of the present invention.

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

As shown in Figure 1, the refrigeration cycle has four strokes of compression, condensation, expansion, and evaporation, and four strokes of compression, condensation, expansion and evaporation cause the refrigerant to flow through the compressor 1, the condenser 3, The valve 5, and the evaporator 7 while circulating.

The compressor (1) compresses and discharges the refrigerant gas in a state of high temperature and high pressure, and the refrigerant gas of high temperature and high pressure discharged from the compressor (1) flows into the condenser (3).

In the condenser (3), the refrigerant compressed in the compressor (1) is condensed into a liquid phase, and heat is discharged to the surroundings through the condensation process.

The expansion valve 5 expands the oil, which is the liquid refrigerant in the high-temperature and high-pressure state condensed in the condenser 3, into the low-pressure oil, and the evaporator 7 evaporates the evaporated oil while evaporating the expanded oil in the expansion valve 5 The refrigerant gas is evaporated while achieving the refrigerating effect by heat exchange with the object to be cooled and returned to the compressor 1 at a low temperature and a low pressure state, and the temperature of the air in the indoor space can be controlled through such a cycle.

The low-temperature low-pressure oil discharged from the expansion valve 5 is transferred to the evaporator 7, and the high-temperature low-pressure oil is evaporated in the evaporator 7 to become a low-temperature low-pressure refrigerant gas. It does not reach the low-pressure refrigerant gas and exists as low-temperature low-pressure oil.

Therefore, the refrigerant transferred from the evaporator 7 to the compressor 1 includes the low-temperature low-pressure refrigerant gas and the oil.

2 to 3, the compressor 1 may be a closed type rotary compressor. The closed type rotary compressor 1 includes a case 10 forming an outer appearance, And a compression unit 30 provided under the case 10 and adapted to compress the refrigerant by receiving power from the electric unit 20.

The case 10 includes a body 11 having a cylindrical shape with upper and lower portions opened, an upper cap 13 coupled to an upper portion of the body 11, and a lower cap 15).

The transmission unit 20 includes a cylindrical stator 21 fixed to the inner surface of the case 10, a rotor 23 rotatably installed in the stator 21, The rotary shaft 25 is connected to the compression unit 30 and transmits power to the compression unit 30.

The detailed configuration of the rotary shaft 25 will be described below.

The compression unit 30 includes a plurality of cylinders 40 having internal spaces 41a and 43a partitioned by each other and a plurality of cylinders 40 each having a plurality of internal spaces 41a and 43a, May include a plurality of flanges (50).

Each of the plurality of cylinders 40 has a rolling piston 31 which eccentrically revolves in the internal spaces 41a and 43a and a rolling piston 31 which contacts the rolling piston 31 in the radial direction and which connects the internal spaces 41a and 43a to the suction chamber And a vane chamber 35 which is recessed toward the outside of the inner spaces 41a and 43a so that the vane 33 moves forward and backward .

A plurality of cylinders 40 may be provided or only one cylinder 40 may be provided, but in the embodiment of the present invention, two cylinders 40 are provided for convenience of explanation.

The cylinder 40 includes a first cylinder 41 having a first inner space 41a formed therein and a second cylinder 43 having a second inner space 43a formed therein and disposed below the first cylinder 41 .

The rotary shaft 25 of the transmission unit 20 penetrates through the first inner space 41a and the second inner space 43a and the rotary shaft 25 passes through the first inner space 41a and the second inner space 43a The first and second rolling pistons 31a and 31b may be connected to the first and second rolling pistons 31a and 31b.

The first rolling piston 31a and the second rolling piston 31b can be engaged with the rotary shaft 25 with eccentricities of different directions from each other and are eccentrically rotated on the inner spaces 41a and 43a through the above- The medium can be compressed.

The vane 33 is constituted by a first vane 33a provided in the first cylinder 41 and a second vane 33b provided in the second cylinder 43. The vane 33 is provided to the rolling piston 31 in the radial direction So that the internal spaces 41a and 43a can be partitioned into a suction chamber and a compression chamber.

The vane chamber 35 may include a first vane chamber 37 provided in the first cylinder 41 and a second vane chamber 39 provided in the second cylinder 43.

The first vane chamber 37 has a first vane 33a which is in contact with the first rolling piston 31a and a second vane 33b which is in contact with the first rolling piston 31a. A first vane guide portion 37a for guiding the first vane 33a so that the first vane guide portion 37a can move back and forth together with the rotation of the first rolling pin 31a, And an airtight chamber 37b having a width larger than the width of the portion 37a.

The second vane chamber 39 includes a second vane guide portion 39a which is recessed toward the outside from the inner wall surface of the second inner space 43a to guide the second vane 33b, And a vane spring receiving portion 39b provided with a vane spring 39c for pressing the second vane 33b toward the second rolling piston 31b so as to divide the inner space 43a .

The flange 50 has a structure in which the upper and lower portions of the plurality of cylinders 41 and 43 are overlapped to form the inner spaces 41a and 43a and the upper flange 51 and the lower flange 51 provided on the upper portion of the first cylinder 41 A middle flange 53 provided between the first cylinder 41 and the second cylinder 43 and a bottom flange 55 provided below the second cylinder 43. [

The top flange 51 and the bottom flange 55 close the upper opening of the first inner space 41a and the lower opening of the second inner space 43a and support the rotary shaft 25, respectively.

The case 10 is provided with a suction portion 60 for sucking refrigerant gas G1 and oil O at a low temperature and a low pressure discharged from the evaporator 7 and a suction portion 60 is provided in the cylinder 40 There is provided a discharge portion 70 for discharging the refrigerant gas G2 of high temperature and high pressure which is sucked into the case 10 and compressed by the compression unit 30. [

Between the lower portion of the bottom flange 55 and the lower cap 15 is provided an oil storage portion 80 in which oil O is stored and the oil O stored in the oil storage portion 80 is connected to the rotation shaft 25 And is transferred to the compression unit 30 for lubrication.

Next, the inside of the compressor 1 is divided into an upper region where a low-pressure refrigerant gas G1 exists and a lower-pressure region where a high-pressure refrigerant gas G2 is present by a top flange 51, Let's take a closer look at the configuration of a rotary compressor.

1 to 3, the casing 10 is provided with a suction section 60 for sucking refrigerant gas G1 and oil O at a low temperature and a low pressure discharged from the evaporator 7, The portion 60 may be provided on the upper cap 13 of the case 10.

The suction unit 60 is directly connected to the evaporator 7 to directly suck the low temperature low-pressure refrigerant gas G1 and the oil O discharged from the evaporator 7.

Only the low-temperature and low-pressure refrigerant gas G1 of the low-temperature low-pressure refrigerant gas G1 and the oil O sucked into the suction unit 60 is transmitted to the compression unit 30 and compressed. Temperature low-pressure refrigerant gas (G1) and the low-temperature and low-pressure oil (O) before the suction of the low-temperature low-pressure refrigerant gas (G1) and the oil (O) G1) must be transmitted to the compression unit (30).

The refrigerant gas G1 of low temperature and low pressure and the oil O of low temperature and low pressure are separated from each other in the case 10 so that only the refrigerant gas G1 of low temperature and low pressure is delivered to the compression unit 30, A guide pipe 90 is provided.

The inside of the case 10 is divided into an upper portion and a lower portion by a top flange 51. The guide pipe 90 is formed by a body portion 11, (Not shown).

One side of the guide pipe 90 connected to the upper part of the body 11 is connected to the upper side of the transmission unit 20 provided inside the body 11 and connected to the lower part of the body 11, The other side of the compression unit 90 can be connected to the cylinder 40 of the compression unit 30. [

4, the low-temperature and low-pressure refrigerant gas G1 and the low-temperature and low-pressure refrigerant gas G1 of the low-temperature and low-pressure refrigerant gas G1 sucked into the suction unit 60 are introduced into the compression unit 90 through the guide pipe 90, The low temperature low-pressure oil O is directly dropped.

The other side of the guide pipe 90 connected to the cylinder 40 is connected to the first cylinder 41 and the second cylinder 43 respectively and is connected to the first cylinder 41 and the second cylinder 43, A first suction pipe 41b and a second suction pipe 43b for sucking the low temperature low-pressure refrigerant gas G1, which is moved through the first suction pipe 90, are provided.

The first connector C1 and the second connector C2 may be inserted into the first suction pipe 41b and the second suction pipe 43b for connection to the other side of the guide pipe 90, respectively.

The low-temperature low-pressure refrigerant gas G1 delivered through the guide pipe 90 is compressed by the high-temperature and high-pressure refrigerant gas G2 in the compression unit 30 and discharged through the discharge portion 70, And the second cylinder 43 are respectively connected to the first discharge pipe 41c and the second discharge pipe 41b which are connected to the discharge portion 70 and through which the high temperature and high pressure refrigerant gas G2 compressed by the compression unit 30 is discharged, 43c.

Temperature low-pressure refrigerant gas G1 sucked into the suction portion 60 and staying on the upper side of the case 10 and a high-temperature and high-pressure refrigerant gas G2 compressed by the compression unit 30 and staying on the lower side of the case 10, A top flange 51 which is provided inside the case 10 so as to divide the inside of the case 10 into an upper portion and a lower portion is fixed to the body 11 by a bond so that the refrigerant gas G1, and G2 are prevented from leaking.

Since the top flange 51 is fixed to the body 11 by the bond, the inside of the case 10 is filled with the upper portion where the low-temperature low-pressure refrigerant gas G1 stays and the high- G2).

However, since the upper portion of the case 10 including the top flange 51 with respect to the top flange 51 maintains a low temperature and the lower portion maintains a high temperature , And the top flange 51 can be fixed to the body 11 by a bond.

The stator 21, the body 11, the rotor 23 and the rotary shaft 25 located on the upper side in the case 10 can also be fixed by a bond.

As described above, since the upper side of the inside of the case 10 in which the transmission unit 20 is provided is kept at a low temperature, the temperature of the transmission unit 20 can be prevented from being increased, and the efficiency of the transmission unit 20 can be improved The configuration of the accumulator for allowing only the refrigerant gas G1 of low temperature and low pressure discharged from the evaporator 5 and the refrigerant gas G1 of the low temperature and low pressure among the oil O to be sucked into the compressor 1 is eliminated, Can be reduced.

The low temperature low pressure refrigerant gas G1 and the low temperature low pressure refrigerant gas G1 among the low temperature low pressure refrigerant gas G1 and the oil O sucked into the suction unit 60 are transmitted to the compression unit 30 through the guide pipe 90, Pressure low-pressure refrigerant gas G2 and is discharged to the discharge portion 70 and delivered to the condenser 3 so that the low-temperature low-pressure oil O is not guided to the guide pipe 90 and is discharged to the case 10 And is stored in the oil reservoir 80. The oil reservoir 80 is provided in the oil reservoir 80,

The low-temperature, low-pressure oil O that is sucked into the suction portion 60 and falls down is stored in an upper portion of the top flange 51 that hermetically seals the upper portion and the lower portion by dividing the inside of the case 10 into an upper portion and a lower portion.

The low temperature low-pressure oil O falls down and cools down the electric unit 20 located above the top flange 51, thereby preventing the electric unit 20 from becoming hot and thereby improving the efficiency of the electric unit 20 .

The low temperature low-pressure oil O stored in the upper portion of the top flange 51 is discharged through the holes provided in the flange 50 of the compression unit 30 and the cylinder 40, 80).

The top flange 51 is provided with a first oil recovery hole 51a through which the low temperature and low pressure oil O stored on the top flange 51 is recovered to the oil reservoir 80, Is provided with a second oil recovery hole 49 for allowing the oil O moved through the first oil recovery hole 51a to be recovered to the oil reservoir 80. [

The first cylinder 41 is provided with a first oil recovery hole (not shown) so that the oil O moved through the first oil recovery hole 51a provided in the top flange 51 can be moved to the second oil recovery hole 49. [ The first guide hole 45 communicating with the first guide hole 51a is provided.

The first guide hole 45 is communicated with the first oil return hole 51a and the oil O moved through the first oil return hole 51a is guided to the first suction pipe 41b of the first cylinder 41, .

The oil O moved into the first suction pipe 41b is moved to the first internal space 41a together with the low temperature low pressure refrigerant gas sucked into the first suction pipe 41b so that the low temperature low pressure refrigerant gas G1 Is compressed by the high temperature and high pressure refrigerant gas (G2), and is discharged to the discharge portion (70) through the first discharge pipe (41c).

A second guide hole 46 connected to the first discharge pipe 41c is formed in the first cylinder 41 to move the oil O moved to the first discharge pipe 41c to the middle flange 53 do.

Although only one second guide hole 46 is shown on the drawing and is connected to the first discharge pipe 41c, a plurality of second guide holes 46 may be provided.

When the second guide holes 46 are provided in plurality, the first guide pipe 45 is connected to the first suction pipe 41b in addition to being connected to the first discharge pipe 41c, Is moved to the first discharge pipe 41c together with the low temperature and low pressure refrigerant gas G1 and is moved to the middle flange 53 through the second guide hole 46 and the remaining part is moved to the first suction pipe 41b To the middle flange 53 through the second guide hole 46 directly.

The middle flange 53 is provided with a third guide hole 53a communicating with the second guide hole 46.

Although the third guide hole 53a is shown as having one third guide hole 53a in the drawing, the third guide hole 53a may be formed in a position corresponding to the number of the second guide holes 46 because it communicates with the second guide hole 46 May be provided.

The second cylinder 43 is provided with a fourth guide hole 47 communicating with the third guide hole 53a and one fourth guide hole 47 is shown in the figure, And may be provided in a number corresponding to the number of the third guide holes 53a since they communicate with the holes 53a.

The second cylinder 43 is provided with a second oil recovery hole 49 for recovering the oil O moved through the fourth guide hole 47 to the oil reservoir 80, (49) is connected to the second discharge pipe (43c).

The oil O sucked into the suction portion 60 and dropped is supplied to the first cylinder 41 through the first oil return hole 51a provided in the top flange 51 and the first guide hole 45 The first suction pipe 41b is moved and the oil O moved to the first suction pipe 41b is moved to the first discharge pipe 41c.

The oil O moved to the first discharge pipe 41c flows through the second guide hole 46 and the third guide hole 53a and the fourth guide hole 47 to the second discharge The oil O moved to the second discharge pipe 43c is moved to the oil reservoir 80 through the second oil recovery hole 49 and is stored.

6, a lower portion of the rotary shaft 25 is accommodated in the oil reservoir 80, and an oil passage 25a is provided in the rotary shaft 25 so that when the rotary shaft 25 is rotated, The oil O stored in the oil passage 80 rises along the oil passage 25a.

The oil O rising along the oil passage 25a is transmitted to the compression unit 30 to lubricate the oil passage 25. Specifically, the oil O rising along the oil passage 25a flows through the rotary shaft 25, The lubricant is transferred between the flanges 51 and between the plurality of cylinders 40 and the plurality of flanges 50 to lubricate them.

An oil supply hole 25b connected to the oil passage 25a is formed in the rotary shaft 25 so that the oil O rising along the oil passage 25a is supplied between the rotary shaft 25 and the top flange 51 do.

The oil supply hole 25b is connected to the oil passage 25a at one side and extends to a surface where the rotary shaft 25 and the top flange 51 are in contact with each other to supply oil between the rotary shaft 25 and the top flange 51 Supply.

 The oil passage 25a may be provided so as to extend to the top of the top flange 51 so that the oil O can be supplied to all the surfaces in contact with the rotating shaft 25 and the top flange 51, The upper portion is filled with the low-pressure refrigerant gas and the lower portion is filled with the high-pressure refrigerant gas. Therefore, the oil O rising through the oil passage 25a can not be supplied to the upper portion of the oil passage 25a.

Therefore, the oil passage 25a is provided so as to extend only to the height at which the oil O can rise, and the oil supply hole 25b is provided on the upper side of the oil passage 25a. The oil O can not be supplied to the upper surface of the oil supply hole 25b.

Since oil O is not supplied to the upper surface of the oil supply hole 25b among the surfaces where the rotary shaft 25 and the top flange 51 are in contact with each other, (B) may be provided.

A part of the oil O rising along the oil passage 25a is supplied to the contact surface between the rotary shaft 25 and the top flange 51 through the oil supply hole 25b to lubricate the remaining portion, (50) and the plurality of cylinders (40) to lubricate them.

The top flange 51 is provided with an oil groove 51b for supplying the oil O supplied to the oil supply hole 25b to the contact surface between the top flange 51 and the first cylinder 41, And the oil groove 51b are communicated with each other.

The oil passage 25a is provided to supply the oil O to the contact surface between the plurality of flanges 50 including the contact surface between the top flange 51 and the first cylinder 41 and the plurality of cylinders 40, A plurality of oil scattering holes 25c may be provided.

A part of the oil O rising along the oil passage 25a flows into the oil passage hole 25b provided below the oil passage hole 25b before rising to the upper portion of the oil passage 25a provided with the oil passage hole 25b 25c so as to be supplied to the contact surfaces between the plurality of flanges 50 and the plurality of cylinders 40. [

As shown in Fig. 7, the suction portion 61 may be provided on the body portion 11 of the case 10.

The suction portion 61 may be provided above the top flange 51 at an upper portion of the body 11 divided into upper and lower portions with respect to the top flange 51.

When the suction portion 61 is provided on the body portion 11, the low-temperature low-pressure refrigerant gas G1 and the low-temperature and low-pressure refrigerant gas G1, Is transferred to the compression unit (30) through the guide pipe (90) and compressed into the high temperature and high pressure refrigerant gas (G2).

The low temperature and low pressure refrigerant gas G1 moves in the upward direction to cool the electric unit 20 so that the temperature of the electric unit 20 can be prevented from being increased and the efficiency of the electric unit 20 can be improved.

When the suction unit 61 is provided on the body 11, the electric unit 20 is cooled by the low-temperature low-pressure refrigerant gas G1, so that the suction unit 60 is provided on the upper cap 13, The efficiency of cooling the electric unit 20 may be better than that in the case where the electric unit 20 is cooled by the oil O of the power unit 20.

When the suction portion 61 is provided on the body portion 11, the suction portion 60 is disposed on the upper cap 13 except for the portion where the electric unit 20 is cooled by the refrigerant gas G1 of low temperature and low pressure. And the flow of the refrigerant gas (G1, G2) and the oil (O) is the same as that in the case where the refrigerant gas is provided in the refrigerant circuit.

While the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Should be interpreted.

1: Closed rotary compressor 3: Condenser
5: expansion valve 7: evaporator
10: Case 11:
13: upper cap 15: lower cap
20: electric power unit 21: stator
23: Rotor 25:
25a: Oil flow path 25b: Oil supply hole
25c: Oil splash hole
30: compression unit 31: rolling piston
31a: first rolling piston 31b: second rolling piston
33: Vane 33a: 1st vane
33b: second vane 35: vane chamber
37: first vane chamber 37a: first vane guide portion
37b: sealing chamber 39: second vane chamber
39a: second vane guide portion 39b: vane spring receiving portion
39c: Vane spring
40: cylinder 41: first cylinder
41a: first internal space 41b: first suction pipe
41c: first discharge pipe 43: second cylinder
43a: second inner space 43b: second suction pipe
43c: second discharge pipe 45: first guide hole
46: second guide hole 47: fourth guide hole
49: Second oil recovery hole
50: flange 51: top flange
51a: first oil recovery hole 51b: oil groove
51c: communicating portion 53: middle flange
53a: third guide hole 55: bottom flange
60, 61: suction portion
70:
80: Oil reservoir
90: guide piping
G1: low temperature low pressure refrigerant gas G2: high temperature high pressure refrigerant gas
O: Oil
C1: first connector C2: second connector
B: Oilless bearing

Claims (15)

A case forming an appearance;
A suction unit provided in the case and sucking refrigerant gas and oil at a low temperature and a low pressure;
A power transmission unit provided on the upper side of the case to generate power;
A compression unit provided on the lower side of the case to compress the refrigerant by receiving power from the electric unit;
A guide pipe extending to the outside of the case so as to communicate the upper portion and the lower portion of the case and guiding the low temperature low pressure refrigerant gas drawn into the suction portion and the low temperature low pressure refrigerant gas in the oil to the compression unit;
A discharge unit for discharging the compressed high-temperature and high-pressure refrigerant gas guided by the compression unit; And
A top flange provided between the electromotive unit and the compression unit to separate the inside of the case into an upper portion in which a low-temperature low-pressure refrigerant gas exists and a lower portion in which a high-temperature and high-pressure refrigerant gas exists;
Wherein the compressor comprises: The method according to claim 1,
Wherein the case includes a body having a cylindrical shape with upper and lower portions opened, an upper cap coupled to an upper portion of the body, and a lower cap coupled to a lower portion of the body. 3. The method of claim 2,
Wherein the suction portion is provided in the upper cap, and the guide pipe is provided so as to communicate the upper portion and the lower portion of the body portion, which is separated into the upper portion and the lower portion by the top flange. The method of claim 3,
The low-temperature low-pressure refrigerant gas sucked into the suction unit and the low-temperature low-pressure refrigerant gas in the oil are guided to the compression unit through the guide pipe, and the low-temperature low-pressure oil falls down from the top of the main body to the bottom, Wherein the first and second rotary compressors are connected to each other. 5. The method of claim 4,
The electromotive unit includes a stator fixed to the inside of the case, a rotor rotatably provided in the stator, and a rotor disposed inside the rotor to rotate together with the rotor, And a rotating shaft which is accommodated in the housing. 6. The method of claim 5,
Wherein the top flange, the case, the stator, the case, the rotor, and the rotary shaft are fixed by a bond. The method according to claim 6,
Wherein the compression unit includes a plurality of cylinders having an inner space for compressing a low temperature and low pressure refrigerant gas and a plurality of flanges provided between the plurality of cylinders to form the inner space together with the plurality of cylinders Sealed rotary compressor. 8. The method of claim 7,
Wherein the plurality of cylinders includes a first cylinder fixed to the bottom of the top flange and a second cylinder disposed below the first cylinder,
Wherein said plurality of flanges include a top flange, a middle flange disposed between said first cylinder and said second cylinder, and a bottom flange disposed below said second cylinder. 9. The method of claim 8,
Wherein the bottom flange is provided with an oil storage portion in which oil is stored, and a first oil returning hole and a second oil returning hole are provided in the top flange and the second cylinder, respectively, And the second oil recovery hole is moved to the oil reservoir through the oil recovery hole and the second oil recovery hole. 10. The method of claim 9,
A first guide hole communicating with the first oil recovery hole to guide the oil moved through the first oil recovery hole to the second oil recovery hole, At least one third guide hole communicating with the second guide hole is provided in the middle flange and at least one third guide hole communicating with the second guide hole is provided in the middle flange, And at least one fourth guide hole communicated to guide the oil to the second oil recovery hole. 10. The method of claim 9,
Wherein a lower portion of the rotary shaft is received in the oil reservoir and an oil passage for guiding the oil stored in the oil reservoir between the rotary shaft and the top flange and between the plurality of cylinders and the plurality of flanges, And the oil stored in the oil reservoir rises along the oil passage when the rotation shaft is rotated. 12. The method of claim 11,
An oil supply hole for supplying oil raised along the oil flow path between the rotation shaft and the top flange and an oil splash hole for supplying oil raised along the oil flow path between the plurality of cylinders and the plurality of flanges, Wherein the top flange is provided with an oil groove for supplying the oil supplied to the oil supply hole between the top flange and the first cylinder and a communication portion for communicating the oil supply hole and the oil groove. compressor. 13. The method of claim 12,
Wherein the communication portion guides oil supplied to the oil supply hole to a lower portion of the oil supply hole and an oilless bearing is provided between the rotation shaft and the top flange on the upper side of the oil supply hole. 3. The method of claim 2,
Wherein the guide pipe is provided so as to communicate with an upper portion and a lower portion of the body separated by the top flange and the suction portion is provided on an upper portion of the top flange at an upper portion of the body portion. 15. The method of claim 14,
The low-temperature low-pressure refrigerant gas drawn into the suction portion and the low-temperature low-pressure refrigerant gas in the oil move upward, cool the electric unit, and are guided to the compression unit through the guide pipe, And the refrigerant is dropped.

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