KR101480467B1 - Hermetic compressor - Google Patents

Abstract

A hermetic compressor is disclosed. The disclosed hermetic compressor includes a casing having a sealed inner space and connected to a suction pipe and a discharge pipe; A driving motor installed in an inner space of the casing and generating a driving force; A compression unit installed in an internal space of the casing and formed by a compression chamber for compressing a refrigerant by being operated by the driving motor; An oil separator for separating the oil from the refrigerant discharged from the compression unit; And an oil recovery pipe communicating the oil separator and the compression chamber so that the oil separated from the oil separator is supplied to the compression chamber. Accordingly, the oil is introduced into the compression unit after the refrigerant is sucked into the compression unit of the hermetic compressor, It is possible to prevent the loss of the compression efficiency due to the volume increase of the refrigerant sucked and supplied to the suction side of the hermetic compressor.

Compressor, oil return pipe, oil supply flow path

Description

{HERMETIC COMPRESSOR}

The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor provided with an oil recovery device for recovering oil discharged together with a refrigerant in a compressor.

A compressor is a mechanical device that compresses a compressible fluid using mechanical energy.

A hermetic compressor means a compressor in which a driving motor for generating a driving force and a compression unit for receiving a driving force of the driving motor and compressing the fluid are installed together in the inner space of the hermetic container.

Such a hermetic compressor is manufactured such that a certain amount of oil is injected into the sealed container to cool the drive motor of the compressor or to lubricate and seal the compression unit.

However, when the hermetic compressor is operated, a problem of being discharged together with the compressed compressible fluid occurs.

As a result, the oil in the compressor becomes insufficient and the reliability of the compressor is lowered, and the heat exchange performance of the cycle is lowered by the oil remaining in the refrigeration cycle.

Accordingly, there is a need to provide an oil recovery device for separating the oil discharged together with the compressed fluid and returning it to the internal space of the hermetic compressor, and development of a related technology has been a recent issue.

In particular, a key measure in the development of technology relating to oil recovery systems is to increase the efficiency of the compressor while minimizing the increase in manufacturing costs incurred by the addition of oil recovery devices.

An object of the present invention is to provide a hermetic compressor capable of improving the performance of the compressor while minimizing an increase in manufacturing cost by simplifying the structure of the oil recovery device.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner comprising: a casing having a closed inner space and to which a suction pipe and a discharge pipe are connected; A driving motor installed in an inner space of the casing and generating a driving force; A compression unit installed in an internal space of the casing and formed by a compression chamber for compressing a refrigerant by being operated by the driving motor; An oil separator for separating the oil from the refrigerant discharged from the compression unit; And an oil return pipe communicating the oil separator and the compression chamber so that oil separated from the oil separator is supplied to the compression chamber.

According to an embodiment of the present invention, the compression chamber is formed by a fixed lap of the fixed scroll fixed to the inner space of the casing, and a orbiting scroll of the orbiting scroll pivotally moved with respect to the fixed scroll by the drive motor, The oil return pipe may be provided to communicate with the compression chamber through the fixed scroll.

In addition, the oil return pipe may be provided in communication with the compression chamber at the beginning of the compression of the refrigerant.

In addition, the oil return pipe may further include an oil seam end on a path of the oil moving from the outlet of the oil separator to the inside of the compression chamber.

Further, in one embodiment related to the present invention, the compression chambers to which oil is supplied are formed symmetrically with respect to the center of the fixed scroll and formed into a pair having the same internal pressure, and the compression chambers are simultaneously communicated with the oil return pipes .

In one embodiment of the present invention, the pair of compression chambers may be communicated with the oil return pipe through a pair of oil supply passages formed in the fixed scroll, respectively.

In one embodiment of the present invention, the lengths of the oil supply passages connecting the oil return pipe and the compression chambers may be equal to each other.

The end of the oil supply passage communicating with the compression chamber may be located at a center of a circle locus at which an arbitrary point of the end portion of the orbiting wrap moves as the orbiting scroll rotates.

In the meantime, according to one embodiment of the present invention, the compression chambers to which the oil is supplied are formed symmetrically with respect to the center of the fixed scroll, the internal pressures of the compression chambers are different from each other, They can be provided to be alternately communicated.

Here, the end of the oil supply passage communicating with the compression chamber may be located at a center of a circular locus at which an arbitrary point of the end portion of the orbiting wrap moves as the orbiting scroll rotates.

According to the hermetic compressor according to an embodiment of the present invention,

Since the oil flows into the compression unit after the refrigerant is sucked into the compression unit of the hermetic compressor, the loss of the compression efficiency due to the volume increase of the refrigerant sucked and supplied to the suction side of the hermetic compressor can be prevented.

Meanwhile, the oil separated from the oil separator is supplied to the compression chamber instead of the suction side of the hermetic compressor. However, in the hermetic compressor related to the present invention, the oil separated from the oil separator is returned to the oil return pipe There is an advantage in that the structure is simple compared to the above, thereby increasing the reliability of the structure and reducing the manufacturing cost.

Further, since the oil separated from the oil separator flows directly into the compression chamber of the compression unit through the oil return pipe, the reliability of lubrication and cooling of the compression unit is improved, and eventually the performance of the compressor is improved.

Hereinafter, an embodiment of the hermetic compressor according to the present invention will be described in detail with reference to FIGS. 1 to 6, with reference to the accompanying drawings.

FIG. 1 is a schematic view of a refrigeration cycle including a hermetic compressor according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the interior of the hermetic compressor and the oil separator in FIG. 1, and FIG. Fig. 5 is a sectional view taken along the line II-II in Fig. 2, Fig. 6 is a sectional view taken along line II-II in Fig. 2, and Fig. Fig.

1 to 3, a closed compressor 100 according to an exemplary embodiment of the present invention includes a condenser 20, an expander 30, and an evaporator 40 as main components of a refrigeration cycle In this case, the suction pipe 113 connected to the casing 110 is connected to the evaporator 40 of the refrigeration cycle, and the discharge pipe 114 is connected to the condenser 20 of the refrigeration cycle.

The hermetic compressor 100 includes a compressor casing 110, a drive motor 120, a compression unit 130, a discharge side of the hermetic compressor 100, a condenser 20 An oil separator 50 installed in a pipe connecting the inlet side of the oil separator 50 for separating the oil mixed in the refrigerant discharged through the discharge pipe 114, And an oil return pipe 180.

Hereinafter, the configuration of the hermetic compressor 100 according to the present embodiment will be described in detail.

First, the casing 110 is formed to have a closed inner space. The casing 110 includes a suction pipe 113 through which the low-pressure gaseous refrigerant having passed through the evaporator 40 flows and a discharge pipe 113 through which the compressed high- (114).

A main frame 111 for supporting one end of the driving unit 120 in the internal space of the casing 110 and driven by the driving unit 120 to compress the refrigerant, And the other end of the sub frame 112 is fixed.

An oil supply hole 115 for injecting oil into the inner space of the compressor casing 110 is formed in the lower half of the compressor casing 110.

When the plurality of compressors are provided, the oil supply hole 115 may be used as a microstructure for communicating a plurality of compressors with each other to make the oil level of the compressors coincide with each other.

The driving unit 120 includes a driving motor 120 installed in an inner space of the casing 110 to generate a driving force and a rotating shaft 123 coupled to the driving motor 120 to be driven do.

The driving motor 120 includes a stator 121a fixed to the inner circumferential surface of the casing 110 and a rotor 121b rotatably disposed inside the stator 121a.

The rotation shaft 123 is coupled to the center of the rotor 122 and is supported by the main frame 111 and the sub frame 112 so that the rotational force of the rotor 121b is transmitted to the compression unit 130 ). An oil passage 123a is formed in the axial direction of the rotary shaft 123 so as to allow the oil supplied to the compression unit 130 to pass therethrough.

Here, the drive motor 120 may be a constant speed motor having a constant rotation speed. However, in consideration of multi-functioning of the refrigerating machine to which the hermetic compressor 100 according to the present embodiment is applied, Can be used.

The compression unit 130 includes a fixed scroll 131 and a rotary scroll 132 that are operated by a rotary shaft 123 driven by the drive motor 120 to compress the refrigerant.

The fixed scroll 131 is fixedly coupled to the main frame 111 and includes a discharge port 131c through which the compressed refrigerant is discharged and a check valve 134 for blocking the back flow of discharge gas discharged through the discharge port 131c ).

The orbiting scroll (132) is supported by the main frame (111) and is positioned to engage with the fixed scroll (131) and pivotally moved by the rotating shaft (123).

At this time, an oriling 133 may be provided between the orbiting scroll 132 and the main frame 111 to guide the orbiting scroll 132 to rotate.

The fixed scroll 131 and the orbiting scroll 132 are formed in a spiral shape with a fixed lap 131a and a orbiting lap 132a which are meshed with each other to form a pair of two compression chambers P in series.

The compression chamber P includes a fixed lap 131a of a fixed scroll 131 fixed to an inner space of the casing 100 and a fixed lap 131a which is pivotally moved with respect to the fixed scroll 131 by the driving motor 120 And is formed by the orbiting wrap 132a of the orbiting scroll 132. The internal volume of the orbiting scroll 132 is changed by the rotation of the orbiting scroll 132 to compress the internal refrigerant.

The compression chamber P is moved to the center of the fixed scroll 131 by the rotation of the orbiting scroll 132 and the compressed refrigerant is discharged through a discharge port formed in the fixed scroll 131 .

The suction port 131b of the fixed scroll 131 is directly connected to the suction pipe 113 for guiding the refrigerant from the refrigeration cycle and the discharge port 131c of the fixed scroll 131 is connected to the inner space of the casing 110 Respectively.

As a result, the internal space of the casing 110 is filled with refrigerant having the same pressure as the discharge pressure, and the hermetic compressor of this type is called a "high-pressure hermetic compressor".

Alternatively, the suction side of the compression unit 130 may be connected to the internal space of the casing 110 so that the internal space of the casing 110 may be filled with the refrigerant at the same pressure as the suction pressure, A hermetic compressor directly connected to the discharge side of the compression unit 130 is called a "low-pressure hermetic compressor".

In FIG. 2, the hermetic compressor according to the present embodiment is a high-pressure hermetic compressor. However, the present invention is not limited to this and can be applied to a low-pressure hermetic compressor.

The oil separator 50 is an apparatus for separating oil from a refrigerant discharged to the outside of the casing 110 and connected to the discharge pipe 114 of the compressor 100, And the separated oil is connected to the compression unit 130 through the oil return pipe 180. The compression unit 130 is connected to the condenser 20 via the oil return pipe 180,

The oil separator 50 is formed in a tubular shape having a closed inner space and is disposed in parallel to one side of the casing 110. The oil separator 50 is connected to the oil return pipe 180, Or may be supported by a separate support member 52, such as a clamp, which is supported on the casing 110 or wrapped around the oil separator 50 and fixed to the casing 110.

A mesh screen is installed in the inner space of the oil separator 50 to separate the refrigerant and the oil or to connect the discharge pipe 114 to the oil separator 50 so as to be off- So that the refrigerant can be rotated in the cyclone form and relatively heavy oil can be separated and the oil can be separated.

The oil return pipe 180 connects the lower part of the oil separator 50 where the separated oil is stored and the compression unit 130 to the compression chamber P ).

In the present embodiment, the oil return pipe 180 may further include a pressure reducing means 181 such as a capillary.

This prevents oil or refrigerant from flowing backward from the compression chamber (P) to the inner space of the oil separator (50).

The oil return pipe 180 communicates the outlet of the oil separator 50 with the compression chamber P through the fixed scroll 131.

In the present embodiment, the compression chambers P are formed in a pair (P1, P2) symmetrically with respect to the center of the fixed scroll 131, and their internal pressures are made equal to each other , And the oil return pipe 180 is provided so as to communicate with the pair of compression chambers P1 and P2 at the same time.

As described above, the compression chamber P is moved to the central portion of the fixed scroll 131 in accordance with the rotation of the orbiting scroll 132 to compress the refrigerant therein. The pair of compression chambers P1, P2 can be provided at the same pressure by making the moving distances of the respective compression chambers by the orbiting scroll of the orbiting scroll 132 the same.

Meanwhile, in the present embodiment, it is preferable that the oil return pipe 180 is provided so as to communicate with the pair of compression chambers P1 and P2 at the beginning of compression. That is, the oil return pipe 180 is provided so that oil is supplied to the compression chambers P1 and P2 immediately after the compression chambers P1 and P2 are formed by the fixed lap 131a and the orbiting lap 132a The wind is big.

As a result, the oil is smoothly supplied to the compression chambers P1 and P2 which are relatively low in pressure, and the volume of the compression chambers P1 and P2 is once formed, .

In the present embodiment, the ends of the oil return pipes 180 are connected to the pair of compression chambers P1 and P2, respectively, so that oil flows through the oil return pipes 180 to the compression chambers P1 , P2) at the same time.

It is also possible to branch the oil return pipe 180 to the compression chambers P1 and P2 so as to communicate with the compression chambers P1 and P2. It is preferable that the oil supply passages 180a and 180b of the oil supply passages 180a and 180b are formed and the ends of the oil supply passages 180a and 180b are communicated with the oil return pipe 180. [

In this case, the lengths of the pair of oil supply passages 180a and 180b are preferably the same so that the amount of oil supplied through the oil supply passages 180a and 180b is the same.

In this embodiment, the ends of the oil supply passages 180a and 180b communicating with the compression chambers P1 and P2 or the ends of the oil return pipe 180 are connected to each other by the orbiting scroll 132 It is preferable to be provided so as to communicate with the compression space C formed by the fixed wraps 131a of the fixed scroll 131 so that any point of the orbiting wrap 132a is located at the center of the moving circle locus .

As the orbiting scroll 131 turns, the oil supplied through the ends of the oil supply passages 180a and 180b or the end of the oil return pipe 180 is supplied to the pair of compression chambers P1 , P2).

The hermetic compressor 100 according to the present embodiment may further include an oil supply unit 140 for supplying the oil stored in the casing 110 to the compression unit 130 and the drive unit 120 have.

This will be described below with reference to Figs. 4 to 6. Fig.

4 to 6, the fuel supply unit 140 is coupled to the rotating shaft 123 to generate a variable volume portion 150a, and the variable volume portion 150a is used to pump the oil, A pump housing 150 accommodating the oil pump 150 and installed inside the casing 110; a pump housing 140 coupled to the pump housing 140 to supply oil to the oil pump 150; And may include a pump cover 142.

The pump housing 141 is formed with a pump receiving portion 141b in which the oil pump 150 is accommodated and a pin portion 123b communicating with the receiving space and extending from the rotating shaft 123 is inserted and received And a through-receiving portion 141a.

The pump housing 141 is coupled to the lower portion of the subframe 112 or is formed integrally with the subframe 112.

The oil pump 150 is constituted by a displacement pump that pumps the oil while varying in volume, such as a trochoidal gear pump.

That is, the oil pump 150 includes an internal gear 151 rotatably received in a pump receiving portion 141b formed in the pump housing 110 and coupled to the rotating shaft 123 to rotate eccentrically, And an outer gear 152 rotatably disposed in the pump accommodating portion 141b so as to be engaged with the inner gear 151 to form a variable volume portion 150a.

The oil pump 150 is operated by the rotary shaft 123 to pump the oil filled in the internal space of the casing 110 or the oil separated from the refrigerant discharged from the compression unit 130, The pumped oil is moved upward along the oil passage 123a of the rotary shaft 123 to lubricate the compression unit 130 and to cool the drive motor 120. [

The pump cover 142 is provided with an oil suction port 142b for recovering oil from the bottom surface of the casing 110. [

The oil suction port 142b is formed in the axial direction to communicate with the oil suction pipe 148 for sucking the oil filled in the casing 110. [

Therefore, it is preferable that the inlet end of the oil suction pipe 148 is formed to have a length that can be locked to the oil filled in the casing 110.

The pump cover 142 is formed with a communication groove 153 so that the oil passage 123a of the rotating shaft 123 communicates with the center of the upper surface.

A suction guide groove 155 communicating with the oil suction port 142b is formed in a circular arc around the one side of the communication groove 153.

At a position spaced apart from the suction guide groove 155 in the circumferential direction, a discharge guide groove 156 through which the oil pumped by the oil pump 150 is discharged is formed in an arc shape.

On the inner side wall of the discharge guide groove 156, a discharge slit 157 is formed to communicate with the communication groove 153.

Meanwhile, the variable volume portion 150a formed in the oil pump 150 includes a suction volume V1 and a discharge volume V2.

The suction volume V1 is formed to gradually increase in volume along the rotation direction of the inner gear 151 from the circumferential starting end to the end of the suction guide groove 155. The discharge volume V2 And is formed so as to follow the rotation direction of the inner gear 151 from the start end to the end of the discharge guide groove 156, which leads to the suction volume V1.

The oil in the casing 110 and the oil separated from the refrigerant are recovered using the oil pump 150 and supplied to the compression unit 130 in the following manner.

The inner gear 151 of the oil pump 150 is coupled to the rotating shaft 123 and eccentrically rotates so that a suction volume V1 and a discharge volume V1 are formed between the inner gear 151 and the outer gear 152. [ (V2) is formed.

The oil suction port 142b communicates with the suction volume V1 and the oil filled in the bottom of the casing 110 communicates with the suction guide groove 155 through the oil suction pipe 148 ≪ / RTI > The oil introduced into the suction guide groove 155 moves from the suction volume V1 to the discharge volume V2.

The oil that has flowed into the discharge volume V2 flows into the discharge guide groove 156 and the oil introduced into the discharge guide groove 156 is discharged through the discharge hole formed in the discharge- The oil flows into the communication groove 153 through the slit 157 and the oil introduced into the communication groove 153 is sucked into the oil passage 123a of the rotary shaft 123.

The oil sucked into the oil passage 123a is pushed up through the oil passage 123a and is raised upward by the centrifugal force of the rotating shaft 123 so that a part of the oil is supplied to the respective bearing surfaces, And flows into the compression unit 130 repeatedly.

Hereinafter, another embodiment of the hermetic compressor according to the present invention will be described in detail with reference to Fig.

However, in describing the above description, the construction overlapping with the embodiment of the hermetic compressor related to the present invention described above and the detailed description thereof are the same as those described above, and will be omitted hereafter.

7 is a cross-sectional view illustrating a compression chamber of a hermetic compressor according to another embodiment of the present invention.

7, the hermetic compressor 200 according to the present embodiment is different from the hermetic compressor 100 according to the above-described embodiment of the present invention in that the structure of the compression chamber P and the structure of the compression chamber P The oil return pipe 280 for supplying oil to the oil return pipe 280 is different from that of the oil return pipe 280, and the other structures are the same.

In the hermetic compressor 200 according to the present embodiment, the compression chambers P are formed in a pair (P1, P2) at symmetrical positions with respect to the center of the fixed scroll 231, P2 are provided with different internal pressures. This is called "asymmetric type" to distinguish it from the "symmetric type" described above.

In this case, since compression of the refrigerant starts from a position close to the suction portion 231b of the compression space formed by the fixed wraps 231a of the fixed scroll 231, the compression performance is improved.

On the other hand, in the present embodiment, the end of the oil return pipe 280 is formed at a position where it alternately communicates with the pair of compression chambers P1 and P2.

Therefore, the end of the oil return pipe 280 is preferably positioned at the center of the circular locus at which an arbitrary point of the orbiting wrap 232a moves as the orbiting scroll 232 rotates.

Hereinafter, another embodiment of the hermetic compressor according to the present invention will be described in detail with reference to Fig.

However, in describing the above description, the construction overlapping with the embodiment of the hermetic compressor related to the present invention described above and the detailed description thereof are the same as those described above, and will be omitted hereafter.

8 is a longitudinal sectional view showing the inside of a hermetic compressor and an oil separator according to another embodiment of the present invention.

Referring to FIG. 8, in the hermetic compressor 300 according to the present embodiment, the oil separator 250 is installed inside the casing 310 of the hermetic compressor 300.

That is, the compressed refrigerant discharged from the compression unit 130 is discharged to the inside of the casing 310 to circulate the inside of the casing 310, and a part of the oil is separated and falls to the lower part of the casing 310, The oil and compressed refrigerant are introduced into the oil separator 250 through the inlet 252 of the oil separator 250 located inside the casing 310.

The oil separated from the oil separator 250 is then accumulated on the bottom of the case 251 of the oil separator 250 so that the oil returning from the bottom of the case 251 to the compression chamber P The oil is supplied to the compression chamber P through the pipe 380.

In this case, the configuration for supplying the oil to the compression chamber P and the position of the compression chamber P to which the oil is supplied are the same as in the above-described embodiment, and will not be described here.

The foregoing has been shown and described with respect to specific embodiments of the invention. However, the present invention can be embodied in various forms without departing from its spirit or essential characteristics, so that the above-described embodiments should not be limited by the details of the detailed description, Even those embodiments which are not individually listed in the description should be construed broadly within the spirit and scope defined in the appended claims. And all changes and modifications that fall within the technical scope of the appended claims and their equivalents shall be covered by the appended claims.

1 is a schematic view illustrating a refrigeration cycle including a hermetic compressor according to an embodiment of the present invention;

FIG. 2 is a longitudinal sectional view showing the inside of the hermetic compressor and the oil separator in FIG. 1,

3 is a cross-sectional view taken along line I-I in Fig. 2,

4 is an exploded view of the fuel supply unit shown in Fig. 2,

Fig. 5 is a cross-sectional view of II-II in Fig. 2,

FIG. 6 is a top view of the pump cover in FIG. 2,

7 is a sectional view showing a compression chamber of a hermetic compressor according to another embodiment of the present invention,

8 is a longitudinal sectional view showing the inside of a hermetic compressor and an oil separator according to another embodiment of the present invention.

Claims (10)

A casing having a closed inner space and connected to the suction pipe and the discharge pipe; A driving motor installed in an inner space of the casing and generating a driving force; A compression unit installed in an internal space of the casing and formed by a compression chamber for compressing a refrigerant by being operated by the driving motor; An oil separator for separating the oil from the refrigerant discharged from the compression unit; And And an oil recovery pipe communicating the oil separator and the compression chamber so that oil separated from the oil separator is supplied to the compression chamber, Wherein the oil return pipe is further provided with an oil seizing step on the oil path from the outlet of the oil separator to the inside of the compression chamber. delete A casing having a closed inner space and connected to the suction pipe and the discharge pipe; A driving motor installed in an inner space of the casing and generating a driving force; A compression unit installed in an internal space of the casing and formed by a compression chamber for compressing a refrigerant by being operated by the driving motor; An oil separator for separating the oil from the refrigerant discharged from the compression unit; And And an oil recovery pipe communicating the oil separator and the compression chamber so that oil separated from the oil separator is supplied to the compression chamber, Wherein the compression chamber is formed by a fixed lap of the fixed scroll fixed to the inner space of the casing and a orbiting wrap of the orbiting scroll pivotally moved with respect to the fixed scroll by the drive motor, And the oil return pipe is provided so as to communicate with the compression chamber through the fixed scroll. The method according to claim 1 or 3, Wherein the compression chambers are formed in pairs in symmetrical positions with respect to the center of the fixed scroll, wherein each compression chamber is provided to have the same internal pressure, And each of the compression chambers simultaneously communicates with the oil return pipe. 4. The oil recovery system according to claim 1 or 3, And the compression chamber communicates with a compression chamber at a stage where compression of the refrigerant starts. 5. The method of claim 4, Wherein the pair of compression chambers are simultaneously communicated with the oil return pipe through a pair of oil supply passages formed in the fixed scroll. delete The method according to claim 6, Wherein an end of the oil supply passage communicating with the compression chamber is located at a center of a circle locus at which an arbitrary point of the orbiting wrap moves as the orbiting scroll rotates. 5. The method of claim 4, Wherein the compression chambers are formed symmetrically with respect to the center of the fixed scroll, and each of the compression chambers is provided to have a different internal pressure, And each of the compression chambers alternately communicates with an end of the oil return pipe. 10. The method of claim 9, Wherein an oil supply passage is formed in the fixed scroll so as to communicate with the compression chamber and the end of the oil supply passage is located at the center of a circle locus at which an arbitrary point of the orbiting wrap moves as the orbiting scroll rotates.

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