KR20090013041A - Hermetric compressor and refrigeration cycle device having the same - Google Patents

Abstract

A hermetic compressor and a refrigerating cycle using the same are provided to prevent the re-introduction of separated refrigerant into the compressor for improving the refrigerating performance of the refrigerating cycle. An oil separator(200) separates oil from refrigerant discharged from a compression unit(30). At least an oil pump(100) pumps the oil separated by the oil separator to recover the same, wherein the oil pump is coupled with a crank shaft(23) of a driving motor(20) to be driven by the rotation force of the crank shaft.

Description

Hermetic compressor and refrigeration cycle device using it {HERMETRIC COMPRESSOR AND REFRIGERATION CYCLE DEVICE HAVING THE SAME}

The present invention relates to an oil recovery apparatus for separating oil from a refrigerant discharged from a compression unit of a hermetic compressor and recovering the separated oil back to the compressor.

Compressors are devices that convert mechanical energy into compressive energy of a compressive fluid. In the hermetic compressor, a driving motor generating a driving force and a compression unit for compressing a fluid by receiving the driving force of the driving motor are installed together in an inner space of the hermetic container.

When the hermetic compressor is installed in a refrigerant compression refrigeration cycle, a certain amount of oil is stored in the hermetic container for cooling the driving motor of the compressor or for lubrication and sealing of the compression unit. However, during operation of the compressor, the refrigerant discharged from the compressor is mixed with oil and discharged together in the refrigeration cycle, and some of the oil discharged from the refrigeration cycle cannot be recovered by the compressor but remain in the refrigeration cycle, resulting in oil shortage in the compressor. have. This may cause a decrease in the reliability of the compressor and may lower the heat exchange performance of the cycle by the oil remaining in the refrigeration cycle.

Therefore, conventionally, an oil separator is installed on the discharge side of the compressor to separate oil from the discharged refrigerant, and the separated oil is recovered to the suction side of the compressor to prevent oil shortage of the compressor and to maintain heat exchange performance of the refrigeration cycle. .

However, in the oil recovery device of the conventional hermetic compressor, as the outlet of the oil separator is connected to the suction side of the compressor, the refrigeration cycle is flowed back to the suction side of the compressor from the oil separator of relatively high pressure to the oil as well as the refrigerant. The amount of refrigerant in the device is insufficient, which can reduce the freezing capacity of the refrigeration cycle. In addition, as the hot oil and the refrigerant are sucked into the suction side of the compressor, the temperature of the suction refrigerant is increased to increase the specific volume, thereby reducing the amount of refrigerant suction in the compression unit, thereby reducing the freezing capacity of the compressor.

In view of this, in the related art, in order to reduce the pressure and temperature of the oil or refrigerant recovered from the oil separator to the compressor and to prevent the refrigerant from flowing back to the compressor, a pressure reducing element such as a capillary tube is introduced into the oil return pipe between the oil separator and the suction side of the compressor. It was sought to install more devices. However, even if the pressure reducing device is installed, since the pressure of the oil separator is higher than the suction side pressure of the compressor, the suction pressure and the suction temperature of the compressor are inevitably increased. In particular, the oil pumping amount inside the compressor during the low speed operation of the compressor. There was a problem that the refrigerant is recovered more than the oil rather than reduced to further reduce the refrigeration capacity of the compressor and the refrigeration cycle.

In addition, as the oil separated and recovered in the oil separator is mixed with the refrigerant to be sucked and discharged through the compression unit, oil may be insufficient in the inner space of the casing, which may further deteriorate the reliability of the compressor. .

The present invention solves the problems of the conventional hermetic compressor as described above, and prevents the refrigerant temperature of the casing from being increased by the oil separated from the refrigerant and at the same time the hermetic compressor capable of forcibly recovering the separated oil to the compressor and the same. It is an object of the present invention to provide a refrigeration cycle apparatus applied.

In addition, an object of the present invention is to provide a hermetic compressor and a refrigeration cycle apparatus using the same, which can prevent the oil recovered through the oil separator from being mixed again with the refrigerant.

In order to achieve the object of the present invention, a closed inner space is provided, the casing is provided with a drive motor and a compression unit actuated in the inner space; A crank shaft installed between the drive motor and the compression unit to transmit a driving force of the drive motor to the compression unit, and an oil flow path formed therein; An oil separator separating oil from the refrigerant discharged from the compression unit; And an oil pump which operates by the rotational force of the crankshaft and recovers the oil separated from the oil separator and simultaneously pumps the oil filled in the inner space of the casing to supply the oil flow path of the crankshaft. Provided is a hermetic compressor coupled to the crankshaft of the drive motor and operated by the rotational force of the crankshaft.

In addition, the casing having a suction pipe and a discharge pipe so that the sealed inner space is in communication with the refrigeration cycle; A drive motor installed in the inner space of the casing; A crank shaft coupled to the rotor of the drive motor to rotate together and an oil flow path formed therein; A compression unit installed in the inner space of the casing and coupled to the crankshaft to compress the refrigerant; An oil separator separating oil from the refrigerant discharged from the compression unit; And at least one oil pump installed in the casing and operated by the crankshaft to pump oil, wherein the oil pump includes a first suction port for pumping oil discharged from the compression unit; There is provided a hermetic compressor having a second suction port communicating with an inner space of the casing and allowing oil in the inner space to be pumped.

In addition, a compressor; Condenser; Inflator; And an evaporator, wherein a refrigeration cycle apparatus further comprises an oil separator for separating oil from refrigerant discharged from the compressor between the compressor and the condenser, wherein a driving force of the drive motor is provided in a casing inner space of the compressor. Is provided with at least one oil pump operated by the rotational force of the crankshaft for transmitting the to the compression unit, the oil separator and the oil pump is connected to the oil return pipe to recover the oil separated from the oil separator to the compressor Refrigeration cycle apparatus is provided.

The compressor according to the present invention relates to a hermetic compressor and a refrigeration cycle apparatus employing the same. The present invention is provided with an oil separator for separating the oil from the refrigerant discharged to the inside or outside of the casing and the oil separated from the oil separator is configured to recover with the oil pump operated by the power of the drive motor, the refrigerant and the oil This effectively separates and reduces manufacturing costs. In addition, it is possible to prevent the refrigerant flowed back into the compressor to improve the freezing performance of the refrigeration cycle. In addition, by driving the oil pump using the power of the drive motor it is possible to simplify the configuration of the compressor and reduce the manufacturing cost.

Hereinafter, a hermetic compressor according to the present invention and a refrigeration cycle apparatus using the same will be described in detail based on an embodiment shown in the accompanying drawings.

1 and 2 are a perspective view showing the outside of the scroll compressor as an example of the compressor according to the present invention and a longitudinal cross-sectional view showing the inside.

As shown in the drawing, the scroll compressor 1 according to the present invention includes a compressor casing (hereinafter, abbreviated as a casing) 10 having a sealed inner space and an inner space of the casing 10 to provide driving force. A driving motor 20 is generated, and a compression unit 30 composed of a fixed scroll 31 and a swinging scroll 32 to compress the refrigerant by operating by the drive motor 20.

In the inner space of the casing 10, the main frame 11 and the subframe 12 supporting the crankshaft 23 of the drive motor 20 and the compression unit 30 are connected to the drive motor ( 20) is fixedly installed on both sides. In addition, the casing 10 is connected to the suction pipe 13 and the discharge pipe 14 so that the compressor 1 forms a refrigeration cycle together with the condenser 2, the expander 3, and the evaporator 4, and the suction pipe 13 ) Is connected to the evaporator 4 of the refrigeration cycle while the discharge pipe 14 is connected to the condenser 2 of the refrigeration cycle. In addition, the suction pipe 13 is directly connected to the suction side of the compression unit 30 so that the inner space of the casing 10 may be filled with the refrigerant forming the discharge pressure, while the discharge side of the compression unit 30 is the casing 10. It communicates with the internal space of). And between the discharge tube 14, that is, between the discharge side of the compressor 1 and the inlet side of the condenser 2 from the refrigerant discharged from the compressor 1 to the condenser 2 through the discharge tube 14 The oil separation unit 40 is installed to separate the oil.

The drive motor 20 may be a constant speed motor with a constant rotation speed, but may be used an inverter motor whose rotation speed may be variable in consideration of the multifunctionality of the refrigeration apparatus to which the compressor 1 is applied.

The drive motor 20 includes a stator 21 fixed to an inner circumferential surface of the casing 10, a rotor 22 rotatably disposed inside the stator 21, and the rotor 22. Is coupled to the center of the crankshaft 23 for transmitting the rotational force of the drive motor 20 to the compression unit (30). The crankshaft 23 is supported by the main frame 11 and the subframe 12. An oil passage 23a penetrates through the crank shaft 23 in the axial direction, and a lower end of the oil passage 23a, that is, a lower end of the crank shaft 23, moves toward the oil passage 23a. The oil pump 100 to be described later is installed to be able to pump.

The compression unit 30 is a fixed scroll (31) coupled to the main frame 11, as shown in Figure 2, two pairs of compression chamber (P) to move continuously in engagement with the fixed scroll (31) Slewing scroll 32 to form a, and the rotation scroll 32 and the main frame 11 is installed between the old dam ring 33 to induce the swinging movement of the swing scroll 32, and the fixed scroll 31 It is provided to open and close the discharge port (31c) of the () consists of a check valve 34 for blocking the reverse flow of the discharge gas discharged through the discharge port (31c). A fixed wrap 31a and a swing wrap 32a, which are engaged with each other to form the compression chamber P, are spirally formed in the fixed scroll 31 and the swing scroll 32, respectively. In addition, a suction pipe 13 for guiding the refrigerant from the refrigerating cycle is directly connected to the suction port 31b of the fixed scroll 31, and the discharge port 31c of the fixed scroll 31 is connected to the inner space of the casing 10. Communicating.

When power is applied to the drive motor 20 in the scroll compressor of the present invention as described above, the crankshaft 23 rotates with the rotor 22 and transmits a rotational force to the turning scroll 32, The turning scroll 32 received the rotational force is rotated by an eccentric distance from the upper surface of the main frame 11 by the old dam ring 33 while the fixed wrap 31a of the fixed scroll 31 and the turning A pair of compression chambers P are continuously formed between the turning wraps 32a of the scroll 32, and the compression chambers P are moved to the center by the continuous turning movement of the turning scrolls 32. As the volume decreases, the refrigerant is compressed. The compressed refrigerant is continuously discharged into the upper space S1 of the casing 10 through the discharge port 31c of the fixed scroll 31 and then moved to the lower space S2 of the casing to discharge the discharge tube 14. The refrigerant is discharged to the condenser (2) of the refrigeration cycle, and the refrigerant discharged to the condenser (2) of the refrigeration cycle is sucked into the compressor (1) through the suction pipe (13) through the expander (3) and the evaporator (4) Repeat a series of steps.

Here, the oil pump 100 operates with the crankshaft 23 while pumping oil separated from the oil filled in the inner space of the casing 10 or the refrigerant discharged from the compression unit 30, and The pumped oil is sucked along the oil passage 23a of the crankshaft 23 to lubricate the compression unit 30 and simultaneously cool the driving motor 20. Looking at this in more detail as follows.

That is, the oil separator 200 for separating the oil from the discharged refrigerant is installed outside the casing 10, the oil separated from the oil separator 200 at the lower end of the oil separator 200 is the oil One end of the oil return pipe 300 for guiding the pump 100 is connected, and the other end of the oil return pipe 300 is connected to the oil pump 100 through the casing 10.

The oil separator 200 is formed in a cylindrical shape having a closed inner space as shown in Figs. 1 and 2 are arranged side by side on the casing 10, the oil separator 200 is an oil recovery pipe ( 300 may be supported by the casing 10 or may be supported by a separate support member 210 such as a clamp that is fixed to the casing 10 by surrounding the oil separator 200.

As shown in FIG. 2, the discharge pipe 14 is connected to the upper sidewall surface of the oil separator 200 so that the refrigerant discharged from the internal space of the casing 10 is guided to the internal space of the oil separator 200. The refrigerant separator 5 is connected to an upper end of the oil separator 200 so that the refrigerant separated from the oil in the internal space of the oil separator 200 moves to the condenser 2 of the refrigeration cycle. The lower end of the 200 is connected to the oil recovery pipe 300 for guiding the oil separated in the inner space of the oil separator 200 to be recovered to the casing 10 or the compression unit 30 to a predetermined depth. . The oil return pipe 300 is made of a metal pipe having a predetermined rigidity so as to stably support the oil separator 200, and the oil separator 200 includes a compressor casing 10 so as to attenuate compressor vibration. It may be bent at an angle disposed in parallel.

And the mesh screen is installed in the inner space of the oil separator 200 to separate the refrigerant and oil or as shown in Figure 3 the discharge pipe 14 is connected to the shaft center of the oil separator 200 is twisted Various ways in which the oil can be separated may be applied, such as allowing the relatively heavy oil to separate as the refrigerant rotates in the form of a cyclone.

The oil pump 100 is composed of a volume pump for pumping oil while the volume is variable, such as a trocoid gear pump. For example, as shown in FIGS. 4 and 5, the oil pump 100 is coupled to a subframe 12 on which the crankshaft 23 is supported, and a pump housing 110 provided with a pumping space 151. An inner gear 120 rotatably disposed in the pumping space 151 of the pump housing 110 and coupled to the crankshaft 23 and engaged with the inner gear 120 to form a variable volume. The outer gear 130 is rotatably disposed in the pumping space 151.

The pump housing 110 is coupled to the upper housing 150 coupled to the subframe 12 and the lower end of the upper housing 150 and the pumping space 151 between the upper housing 150. It consists of a lower housing 160 is formed. A through hole 152 is formed in the bottom surface of the upper housing 150 so that the pin portion 23b of the crankshaft 23 penetrates, and the lower housing 160 includes a first suction port 162 and a second material. 2 suction ports 163 are formed. The first suction port 162 is formed in the radial direction so as to communicate with the oil return pipe 300, the second suction port 163 is formed in the axial direction so as to communicate with the oil suction pipe 400. The oil suction pipe 400 is formed so that its inlet end is immersed in the oil filled in the casing (10).

And the lower housing 160 has a communication groove 161 is formed in the center of the upper surface as shown in Figure 6 and 7 so that the oil flow path 23a of the crankshaft 23, the communication groove 161 The first suction guide groove 165 in communication with the first suction port 162 is formed on one side of the side, that is, the surface in contact with the one side surface of the inner gear 120 and the outer gear 130, the first suction A second suction guide groove 166 is formed at one side of the circumferential direction of the guide groove 165 in communication with the second suction port 163, and the first suction guide groove 165 and the second suction guide groove 166 are provided. On the opposite side of the discharge guide groove 167 is formed. Here, the first suction port 162 and the second suction port 163 may be formed to communicate with each other, but when the pressure difference between the first suction port 162 and the second suction port 163 occurs, the oil may flow back. As such, the first suction port 162 and the second suction port 163 may be preferably formed at regular intervals so as not to communicate directly with each other.

The first suction guide groove 165 and the second suction guide groove 166 are formed in an arc shape having an arc angle of about 90 °, and the first suction guide groove 165 and the second suction guide groove. 166 is divided into a partition wall. The discharge guide groove 167 is formed in an arc shape to have an arc angle of approximately 180 °, and the discharge slit 168 is formed on the inner wall of the discharge guide groove 167 so as to communicate with the communication groove 161. Is formed.

The variable volume formed by the inner gear 120 and the outer gear 130 includes a suction volume part V1 and a discharge volume part V2. As shown in Figure 6, the suction volume (V1) is a direction of rotation of the inner gear 120 from the circumferential start end of the first suction guide groove 165 to the end of the second suction guide groove 166. As a result, the volume is gradually increased, and the discharge volume V2 is connected to the suction volume V1 and along the rotational direction of the inner gear 120 from the end to the end of the discharge guide groove 167. The volume is formed to decrease.

On the other hand, the lower half of the compressor casing 10 is provided with an oil supply hole 15 for injecting oil into the inner space of the compressor casing 10. The oil supply hole 15 may utilize a homogeneous hole that communicates the plurality of compressors with each other in order to match the oil level of each compressor when a plurality of compressors are provided.

In the hermetic compressor according to the present invention as described above, the oil separated from the oil and the refrigerant of the casing by using the oil pump is recovered and then supplied to the compression unit as follows.

That is, the inner gear 120 of the oil pump 100 is coupled to the crankshaft 23 to rotate eccentrically between the inner gear 120 and the outer gear 130 and the discharge volume (V1) and discharge Volume V2 is formed. As the first suction port 162 and the second suction port 163 communicate with the suction volume V1, the oil separated from the oil separator 200 is separated into the first suction port 162 as shown in FIG. 8. While the oil is introduced into the first suction guide groove 165 through the recovery pipe 300, the oil filled in the bottom side of the casing 10 is the oil suction pipe 400 as the second suction port 163 as shown in FIG. 9. Is introduced into the second suction guide groove through. The oil introduced into the first suction guide groove is contained in the suction volume portion V1 and flows into the second suction guide groove beyond the partition wall, and the oil introduced into the second suction guide groove is the suction volume portion V1. ) Is moved to the discharge volume V2.

And the oil moved to the discharge volume (V2) is introduced into the discharge guide groove 167, as shown in Figure 10, the oil introduced into the discharge guide groove 167 of the discharge guide groove 167 The oil is introduced into the communication groove 161 through the discharge slit 168 provided on the inner circumferential wall surface, and the oil introduced into the communication groove 161 is sucked into the oil flow path 23a of the crankshaft 23. The oil sucked into the oil passage 23a is pushed up through the oil passage 23a and is sucked upward by the centrifugal force of the crankshaft 23, while a part thereof is supplied to each bearing surface while the rest is at the top. The process is repeated to be scattered in the flow into the compression unit 30 is repeated.

Here, the oil separated by the oil separator 200 is recovered to the oil pump 100 through the oil return pipe 300, and the recovered oil is directly supplied to the bearing surface and the compression unit 30. . However, in the oil recovered through the oil return pipe 300, foreign substances such as welding by-products generated during assembly of the compressor are contained, so that the foreign substances must be filtered to prevent wear of the bearing surface and the compression unit 30. have. Therefore, in the middle of the oil return pipe 300, it may be desirable to install a foreign matter separator (not shown) for filtering foreign matter contained in the oil.

In this way, as the oil separated from the oil separator is forcibly recovered by the oil pump, the oil recovery amount is greatly increased, so that the heat exchange performance of the refrigeration cycle can be increased, thereby greatly improving the cooling capacity of the refrigeration cycle.

In addition, as the forcibly recovered oil flows directly into the oil channel of the crankshaft without passing through the inner space of the compressor casing, the oil is remixed with the sucked refrigerant and the outflow is reduced again. Since the refrigerant can be prevented from being re-expanded after being separated from the refrigerant, the performance and reliability of the compressor can be improved, and the cooling capacity of the refrigeration cycle can be improved.

In addition, as the oil is recovered using one oil pump and the oil of the casing is pumped, the oil pump may be simplified to reduce manufacturing costs. In addition, as the oil pump is operated by using the driving force of the drive motor, the configuration of the compressor can be simplified to further reduce the manufacturing cost.

On the other hand, if there is another embodiment for the oil pump in the hermetic compressor according to the present invention.

That is, in the above-described embodiment, one oil pump was configured to perform the operation of recovering the oil separated from the oil separator and the operation of pumping the oil filled in the inner space of the casing. As shown in FIG. 11, the first oil pump 1100 is provided with a plurality of oil pumps to recover oil, while the second oil pump 1200 receives oil filled in the inner space of the casing 10. To do the pumping work.

To this end, the first oil pump 1100 and the second oil pump 1200, such as the oil pump 100 of the above-described embodiment is to be composed of a trocoid gear pump having a first variable volume and a second variable volume Can be. In this case, the first oil pump 1100 and the second oil pump 1200 may be disposed on both upper and lower sides along the axial direction.

12 and 13, the first oil pump 1100 is inserted into the first pumping space 1151 of the pump housing 1110 and coupled to the crankshaft 23 to perform eccentric rotation. The first inner gear 1210 and the first outer gear 1220 that meshes with the first inner gear 1210 to form a first variable volume.

The second oil pump 1200 is inserted into the second pumping space 1161 of the pump housing 1110 and coupled to the crank shaft 23 to the second inner gear 1310 and the eccentric rotation, and the first The second outer gear 1320 is engaged with the inner gear 1310 to form a second variable volume.

The pump housing 1110 is disposed on an upper housing 1111 coupled to the subframe 12, an intermediate housing 1112 disposed on a bottom surface of the upper housing 1111, and a bottom surface of the intermediate housing 1112. And a lower housing 1113 which is fastened to the upper housing 1111 together with the intermediate housing 1112.

A first pumping space 1151 is formed at a bottom of the upper housing 1111 so that the first inner gear 1210 and the first outer gear 1220 are inserted therein, and in the center of the first pumping space 1151. A first pin hole 1152 is formed to penetrate the pin portion 23b of the crankshaft 23.

A second pumping space 1161 is formed at a bottom of the intermediate housing 1112 so that the second inner gear 1310 and the second outer gear 1320 are inserted, and a center of the second pumping space 1161 is formed. The second pin hole 1162 is formed in the crankshaft 23 so that the pin portion 23b of the crankshaft 23 passes therethrough.

13 and 14, in the radial direction of the intermediate housing 1112, a first suction port 1163 communicating with the oil return pipe 300 is formed, and the first suction port 1163 is formed in the radial direction of the intermediate housing 1112. A first suction guide groove 1165 for communicating with the first suction volume V11 between the first inner gear 1210 and the first outer gear 1220 is formed in a semicircular arc shape.

The first discharge guide groove 1166 allows the first discharge volume portion V12 to communicate with the first inner gear 1210 and the first outer gear 1220 on the opposite side of the first suction guide groove 1165. Is formed on the outer wall of the first discharge guide groove 1166 to allow the oil of the first discharge guide groove 1166 to guide the oil into the inner space of the casing 10. It is formed to communicate with the inner space of the casing (10). The first discharge slit 1167 may be formed in a hole shape.

As shown in FIGS. 13 and 15, a communication groove 1171 is formed at the center of the lower housing 1113 so as to communicate with the oil flow path 23a of the crankshaft 23. A second suction port 1172 is formed in the axial direction in communication with the oil suction pipe 400, and the second suction port 1172 is formed between the second inner gear 1310 and the second outer gear 1320. A second suction guide groove 1173 for communicating with the second suction volume V21 is formed in a semicircular arc shape. In addition, a second discharge guide groove 1174 for allowing a second discharge volume V22 between the second inner gear 1310 and the second outer gear 1320 to communicate with the opposite side of the second suction guide groove 1173. And a second discharge slit on the inner wall surface of the second discharge guide groove 1174 to guide the oil of the second discharge guide groove 1174 to the oil flow path 23a of the crankshaft 23. 1175 is formed to communicate with the communication groove.

In the oil pump of the scroll compressor according to the present invention as described above, the oil is separated from the oil separator 200 of the first oil pump 1100 through the oil return pipe 300 and the first suction port 1163. Flows into the first suction guide groove 1165 constituting the first suction volume V11, and the oil of the first suction guide groove 1165 moves to the first discharge volume V12 to guide the first discharge guide. The oil is introduced into the groove 1166, and the oil of the first discharge guide groove 1166 is discharged into the inner space of the casing 10 through the first discharge slit 1167.

At the same time, the oil filled in the inner space of the casing 10 and the oil recovered into the inner space of the casing 10 through the first oil pump 1100 are the oil suction pipe 400 and the second suction port 1172. Through the second suction guide groove (1173) constituting the second suction volume (V21) of the second oil pump (1200), the oil in the second suction guide groove (1173) is the second discharge volume portion Move to V22 to flow into the second discharge guide groove 1174, and the oil of the second discharge guide groove 1174 flows into the communication groove 1171 through the second discharge slit 1175. In addition, the oil of the communication groove 1171 repeats a series of processes supplied to each bearing surface and the compression unit 30 through the oil passage 23a of the crankshaft 23.

In this way, the oil separated in the oil separator is guided to the oil flow path of the crankshaft after passing through the inner space of the casing. Even in this case, the effects are almost similar to those of the above-described embodiment. However, in the present embodiment, when the oil separated from the oil separator is not directly guided to the oil flow path of the crankshaft, but is first recovered to the inner space of the casing and then guided to the oil flow path of the crankshaft, it is applied to the refrigeration cycle. There is no risk that foreign matter remaining on the pipeline of the refrigeration cycle will flow directly into the oil channel of the crankshaft. Accordingly, there is no need to install a foreign matter filtration device that is usually provided at the suction side of the compressor, so that the overall manufacturing cycle can be reduced in cost.

On the other hand, the scroll compressor according to the present invention and a second oil pump for pumping the oil of the casing in the refrigeration cycle apparatus using the same if there is another embodiment as follows.

That is, in the above-described embodiment, the second oil pump is composed of a volumetric pump, such as a trocoid gear pump, but in the present embodiment, the second oil pump 1300 is composed of an axial flow pump, such as a propeller pump, as shown in FIG. will be.

In this case, the first oil pump 1100 is configured in the same manner as in FIGS. 13 and 14, and the second oil pump 1300 is inserted into the pin part 23b of the crankshaft 23. Can be. Detailed description thereof will be omitted. However, in this case, the second oil pump 1300 may have a shortage of oil supply during low speed operation as compared to the trocoid gear pump as in the above-described embodiment, but in a low capacity compressor, the manufacturing cost for the second oil pump 1300 may be reduced. Can be.

On the other hand, if there is another embodiment for the installation position of the oil separator 200 in the scroll compressor of the present invention and the refrigeration cycle apparatus using the same.

That is, in the above-described embodiments, the oil separator 200 is disposed outside the casing of the compressor, but in this embodiment, the oil separator 200 is installed inside the casing 10.

For example, as shown in FIG. 17, the oil separator 200 is separated from an inner space of the casing 10 and fixedly installed in the inner space of the casing 10, and the oil separation cap ( An oil separation tube 252 and the compression unit 30 which communicate with one side of the wall 251 and separate the refrigerant and oil filled in the inner space of the casing 10 while flowing into the oil separation cap 251. ) Is installed between the oil separator 200 and the separation cover 253 to separate the discharge side of the compression unit 30 from the oil separator 200.

And the upper side of the oil separation cap 251, the discharge pipe 14 is deeply inserted into the inner space, that is, the separation space of the oil separation cap 251 is sealed and coupled, the oil separation cap 251 and the separation cover An oil recovery flow path 254 is formed between 253 so that the oil separated in the inner space of the oil separation cap 251 exits the oil separation cap 251 and is recovered to the inner space of the casing 10. And, the oil recovery passage 254 is connected to the oil recovery pipe 300, the other end of the oil recovery pipe 300 is connected to the suction side of the oil pump 100 for forcibly pumping the separated oil. . Here, the oil pump may be the same as the above-described embodiment, that is, the oil pump 100 of FIG. 2 or the same as FIG. 13 or FIG. 16.

The oil separation pipe 252 is installed so that the inlet end is in communication with the upper space (S1) of the casing 10, the outlet end is in communication with the inner space of the oil separation cap 251. In addition, the oil separation pipe 252 may be curved or bent as shown in the discharge pipe 14 of FIG. 3 so that the oil is separated while the refrigerant and the oil guided to the oil separation cap 251 spirally rotate. .

The process of separating and recovering oil in the scroll compressor according to the present embodiment as described above is similar to the above-described embodiment, and thus a detailed description thereof will be omitted.

However, in this embodiment, as the oil separator 200 is installed inside the compressor casing 10, the flow direction of the refrigerant and the oil is slightly different from the above-described embodiment. That is, the refrigerant discharged from the compression chamber P moves to the lower space S2 in which the driving motor 20 is installed through the inlet fluid passage (not shown) and then to the upper space through the outlet fluid passage (not shown). Move to S1.

Then, the refrigerant is introduced into the oil separation cap 251 through the oil separation pipe 252 and the oil is separated while turning inside the oil separation cap 251. The refrigerant separated from the oil moves to the refrigeration cycle through the discharge pipe 14, while the oil separated from the refrigerant flows into the oil flow of the crankshaft 23 through the oil recovery pipe 300 by the oil recovery pump 100. The sequence of steps returned to 23a is repeated.

Here, as shown in FIG. 18, the oil return pipe 300 may be drawn out of the casing 10 and then inserted into the casing 10 to be connected to the oil pump 100. In this case, a heat dissipation member (not shown) may be installed in the middle of the oil recovery pipe 300, or a capillary path 310 may be formed.

When the oil separator is installed inside the casing as described above, the compressor and the oil separator can be manufactured integrally, thereby simplifying the configuration of the refrigeration cycle including the compressor. And it is possible to simplify the piping for connecting the oil separator to the compressor can further reduce the manufacturing cost.

Meanwhile, in the above embodiments, one compressor is connected to one oil separator, but in particular, when the oil separator is installed outside the compressor casing, a plurality of compressors may be connected to one oil separator. Of course, even when the oil separator is installed inside the compressor casing, a plurality of compressors may be connected to one oil separator.

Although the scroll compressor has been described as an example, the present invention is not limited to the scroll compressor but may be equally applied to a so-called hermetic compressor in which a driving motor such as a rotary compressor and a compression unit are installed in the same casing.

1 is a perspective view showing a state in which a hermetic compressor according to the present invention is connected to a refrigeration cycle,

Figure 2 is a longitudinal sectional view showing an embodiment of the oil pump applied to the scroll compressor of the hermetic compressor according to Figure 1,

3 is a cross-sectional view taken along line I-I of FIG. 2;

4 is an exploded perspective view of the oil pump in the scroll compressor according to FIG. 2;

Figure 5 is a longitudinal cross-sectional view showing the assembly of the oil pump in the scroll compressor according to FIG.

6 is a plan view showing a lower housing including an inner gear and an outer gear in the oil pump according to FIG. 5;

7 is a plan view showing an upper surface of the lower housing in which the inner gear and the outer gear are removed from the oil pump according to FIG. 6;

8 to 10 is a plan view schematically showing a process of pumping oil in the oil pump according to FIG.

Figure 11 is a longitudinal sectional view showing another embodiment of the oil pump applied to the scroll compressor of the hermetic compressor according to Figure 1,

12 is an exploded perspective view of the oil pump according to FIG. 11;

13 is a longitudinal sectional view showing the cooking oil pump according to FIG.

14 is a plan view showing a first oil pump in the oil pump according to FIG.

15 is a plan view showing a second oil pump in the oil pump according to FIG.

16 is a longitudinal sectional view showing another embodiment of the second oil pump in the oil pump according to FIG. 11;

17 is a longitudinal sectional view showing another embodiment of the oil separator in the scroll compressor according to FIG. 2;

18 is a longitudinal sectional view showing another embodiment of the oil return pipe in the scroll compressor including the oil separator according to FIG.

** Description of symbols for the main parts of the drawing **

10 casing 13: suction pipe

14: discharge tube 20: drive motor

23: crankshaft 23a: oil euro

23b: pin 100: oil pump

110: pump housing 150: upper housing

151: pumping space 160: lower housing

161: communication groove 162: first suction port

163: second suction port 165: first suction guide groove

166: second suction guide groove 167: discharge guide groove

168: discharge slit 200: oil separator

251: oil separation cap 252: oil separation pipe

253: separation cover 254: oil recovery passage

300: oil recovery pipe 1100: pump housing

1111: upper housing 1112: intermediate housing

1113: lower housing 1151: first pumping space

1152: first pin hole 1161: second pumping space

1162: second pin hole 1163: first suction port

1165: first suction guide groove 1166: first discharge guide groove

1167: first discharge slit 1171: communication groove

1172: second suction port 1173: the second suction guide groove

1174: second discharge guide groove 1175: the second discharge slit

1200: first oil pump 1210: first inner gear

1220: first outer gear 1300: second oil pump

1310: second inner gear 1320: second outer gear

2000: Oil recovery pump V1: Suction volume part

V2: discharge volume V11: first suction volume

V12: first discharge volume V21: second suction volume

V22: second discharge volume

Claims (21)

A casing having a sealed inner space and connected with a suction pipe and a discharge pipe; A driving motor installed in the inner space of the casing and generating a driving force; A compression unit installed in the inner space of the casing and operated by the driving motor to compress the refrigerant; An oil separator separating oil from the refrigerant discharged from the compression unit; And And at least one oil pump pumping and recovering oil separated from the oil separator. The oil pump is hermetic compressor coupled to the crankshaft of the drive motor is operated by the rotational force of the crankshaft. The method of claim 1, The oil pump is provided with one, the one oil pump to recover the oil separated in the oil separator and at the same time pumping the oil filled in the inner space of the casing. The method of claim 1, The oil pump is provided with a plurality, wherein the first oil pump to recover the oil separated in the oil separator while the other second oil pump pumps the oil filled in the inner space of the casing. The method of claim 3, The second oil pump is hermetically coupled compressor consisting of a volume pump coupled to the crankshaft to generate a variable volume and pumping oil using the variable volume. The method of claim 3, The second oil pump is a hermetic compressor consisting of a propeller pump coupled to the oil flow path of the crankshaft to generate a pumping force while rotating with the crankshaft. The method according to any one of claims 1 to 5, The oil separator is a hermetic compressor installed on the outside of the casing. The method according to any one of claims 1 to 5, The oil separator is a hermetic compressor installed in the casing. A casing having a suction pipe and a discharge pipe so that the sealed inner space communicates with the refrigeration cycle; A drive motor installed in the inner space of the casing; A crank shaft coupled to the rotor of the drive motor to rotate together and an oil flow path formed therein; A compression unit installed in the inner space of the casing and coupled to the crankshaft to compress the refrigerant; An oil separator separating oil from the refrigerant discharged from the compression unit; And And at least one oil pump installed in the casing and operated by the crankshaft to pump oil. The oil pump is a hermetic compressor having a first inlet for pumping the oil discharged from the compression unit and a second inlet for communicating with the inner space of the casing to pump the oil in the inner space. The method of claim 8, The first suction port and the second suction port are provided in one oil pump, and the oil pumped through the first suction port and the oil pumped through the second suction port are combined to guide the oil flow path of the crankshaft. . The method of claim 8, The oil pump includes a pump housing having a first suction port and a second suction port, and having a pumping space, an inner gear rotatably inserted into the pumping space of the pump housing, and coupled to the crankshaft to rotate, and the inner side. An outer gear rotatably inserted into the pumping space together with a gear and engaged with the inner gear to form a variable volume; The pump housing is formed by separating the first suction guide groove communicating with the first suction port and the second suction guide groove communicating with the second suction port, At least one discharge guide groove is formed opposite the first suction guide groove and the second suction guide groove so as to communicate with the oil flow path of the crankshaft. The method of claim 10, A communication groove is formed in the pump housing so as to communicate with the oil flow path of the crankshaft, and the first suction guide groove, the second suction guide groove and the discharge guide groove are formed in an arc shape around the communication groove, respectively. An airtight compressor in which a discharge slit is formed between the inner circumferential wall of the guide groove and the wall of the communication groove to allow oil to pass therethrough. The method of claim 8, The oil pump is a hermetic compressor having a first oil pump having the first suction port and a second oil pump having the second suction port along the axial direction. The method of claim 12, The first oil pump may be rotatably inserted into the first pump housing having a first pumping space and a first pumping space of the first pump housing to communicate with the first suction port, and coupled to the crankshaft to rotate. A first inner gear and a first outer gear rotatably inserted into the first pumping space together with the first inner gear and engaged with the first inner gear to form a first variable volume; The first pump housing is formed with a first suction guide groove in which the first suction port is in communication, the first suction guide groove is a hermetic compressor having a first discharge guide groove in communication with the inner space of the casing is formed. . The method of claim 12, The second oil pump may be rotatably inserted into the second pump housing having a second pumping space and the second pumping space of the second pump housing so as to communicate with the second suction port, and coupled to the crankshaft to rotate. A second inner gear and a second outer gear rotatably inserted with the second inner gear in a second pumping space and engaged with the second inner gear to form a second variable volume; The second pump housing is formed with a second suction guide groove in which the second suction port is in communication, the opposite side of the second suction guide groove is a hermetic compressor having a second discharge guide groove in communication with the oil flow path of the crankshaft. . The method according to any one of claims 8 to 14, The casing is a hermetic compressor in which the inner space is in communication with the suction pipe, the discharge side of the compression unit is in communication with the discharge pipe. The method according to any one of claims 8 to 14, The suction side of the compression unit is in communication with the suction pipe, the inner space of the casing is hermetic compressor in communication with the discharge pipe. A compressor including a drive motor and a compression unit operated by the drive motor in a sealed inner space of the casing; A condenser connected to the discharge side of the compressor; An expander coupled to the condenser; An evaporator connected to the inflator and connected to the suction side of the compressor; And And an oil separator installed between the compressor and the condenser to separate oil from the refrigerant. At least one oil pump is provided in the inner space of the casing of the compressor to be coupled to the crankshaft of the drive motor to pump oil separated from the oil separator and to pump oil filled in the inner space of the casing. Refrigeration cycle apparatus, characterized in that. The method of claim 17, The oil pump is a refrigeration cycle device of the outlet side is in direct communication with the oil flow path provided in the crankshaft, the oil recovered in the oil separator is supplied to the oil flow path of the crankshaft. The method of claim 18, In the middle of the oil return pipe refrigeration cycle device further comprises a foreign matter separator for filtering foreign matter contained in the oil. The method of claim 17, A plurality of oil pumps are provided, at least one of the plurality of oil pumps has an outlet side communicating with the inner space of the casing of the compressor, the oil recovered from the oil separator is the inner space of the casing of the compressor Refrigeration cycle device to be supplied to the oil passage provided in the crankshaft through. The method according to any one of claims 17 to 20, Refrigerating cycle apparatus is connected to the oil separator a plurality of compressors.

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