KR20100054040A - Hermetic compressor - Google Patents

Abstract

PURPOSE: A hermetic compressor is provided to prevent the leakage which is generated from the inside of a compressing chamber and to improve lubricating and cooling efficiency by directly supplying oil to the compressing chamber by an oil supplying unit. CONSTITUTION: A hermetic compressor(100) comprises: a casing(110) which includes a sealed interior space and is connected to an intake pipe and a discharge pipe; a driving unit(120) which is installed in the interior space and generates driving force; a compressing unit(130) is installed in the interior space and compresses refrigerant by the driving unit; an oil supply unit(170) which selectively supplies oil which is saved in the casing inside to the compressing unit. The oil supply unit supplies the oil to the compressing unit while the speed of the rotation of the drive unit is the predetermined speed or less.

Description

Hermetic compressor {HERMETIC COMPRESSOR}

The present invention relates to a hermetic compressor, and more particularly to an inverter compressor employing an inverter motor having a variable rotational speed.

Compressors are mechanisms for compressing compressible fluids using mechanical energy.

Generally, a compressor includes a drive motor generating a driving force and a compression unit receiving a driving force of the driving motor to compress the fluid, and a predetermined amount of oil is used to cool the driving motor or to lubricate and seal the compression unit. It will be manufactured in the state injected inside.

Recently, there is an increasing demand for the development of a compressor whose compression capacity changes with time in order to increase the compression efficiency. For example, a compressor having a variable compression capacity by employing an inverter motor having a variable rotational speed (so-called Inverter compressors are being launched.

However, this causes the following problems.

First, when the inverter compressor is operated at a low speed, the amount of oil flowing into the compression unit decreases, leading to an increase in leakage of the compressive fluid. Is generated.

In order to prevent this, when the proper amount of oil is supplied to the compression unit during the low speed operation, the oil is excessively supplied during the medium / high speed operation, leading to an increase in the amount of oil contained in the discharge gas, which causes the compression efficiency and There is a problem that leads to a decrease in reliability.

An object of the present invention is to provide a hermetic compressor in which a suitable oil can be supplied to a compression unit during low speed operation in a hermetic compressor employing an inverter motor.

In addition, it is an object of the present invention to provide a hermetic compressor that can supply the appropriate oil to the compression unit during the low speed operation of the inverter motor while minimizing the increase in manufacturing cost.

In order to achieve the above object of the present invention, the casing having a sealed inner space, the suction pipe and the discharge pipe is connected; A driving motor installed in the inner space and generating a driving force; A compression unit installed in the inner space and operated by the driving motor to compress the refrigerant; And an oil supply unit for selectively supplying oil stored in the casing to the compression unit.

In addition, as an example related to the present invention, the oil supply unit may be provided to supply oil to the compression unit when the rotational speed of the drive motor is less than a predetermined speed.

In addition, as an example related to the present invention, the oil supply unit is formed by a fixed wrap of a fixed scroll fixed to the inner space of the casing and a turning wrap of a rotating scroll pivoting with respect to the fixed scroll by the driving motor. It can be provided to supply oil to the compression chamber.

In addition, as an example related to the present invention, the compression chamber in which oil is supplied may be provided as a compression chamber at which compression of the refrigerant is started.

In addition, as an example related to the present invention, the oil supply unit may include: an oil supply pipe communicating the oil storage unit and the compression unit inside the casing in which oil is stored; A control valve installed in the oil supply pipe and controlled to open the oil supply pipe only when the rotational speed of the drive motor is equal to or less than a preset speed; And a pressure reducing device provided in the oil supply pipe to lower the pressure of oil.

In addition, as an example related to the present invention, the pressure reducing device may be located at the front of the control valve based on the movement direction of the oil.

In addition, as an example related to the present invention, the oil supply unit may be installed in the inner space of the casing.

In addition, as an example related to the present invention, the oil supply unit may include: an oil supply pipe communicating the oil storage unit and the compression unit inside the casing in which oil is stored; A recovery pipe communicating with the oil supply pipe and an outlet of an oil separator for separating oil from refrigerant discharged from the compression unit; A control valve installed in the oil supply pipe to open the oil supply pipe when the rotational speed of the drive motor is equal to or less than a preset speed; And a pressure reducing device provided in the oil supply pipe to lower the pressure of oil.

In addition, as an example related to the present invention, a check valve may be further provided in the recovery pipe to prevent oil from flowing back from the recovery pipe into the oil separator.

In addition, as an example related to the present invention, the oil supply unit is formed by a fixed scroll fixed to an inner space of the casing, a rotating scroll pivoting relative to the fixed scroll by the driving motor, and an inner wall surface of the casing. It may be provided to communicate the back pressure space and the oil storage portion.

According to the hermetic compressor according to the embodiment related to the present invention,

Since the control valve is opened and the oil is supplied to the compression unit during the low speed operation by the oil supply unit at a lower speed or less, there is an advantage in that problems such as leakage increase, efficiency decrease, and discharge gas temperature rise that occur during low speed operation are prevented.

In addition, since the oil is supplied directly to the compression chamber of the compression unit by the oil supply unit, there is an advantage that the efficiency of the leakage prevention and the lubrication / cooling action occurring inside the compression chamber is improved and the reliability is improved.

In addition, when applied to the high pressure hermetic compressor, the oil supply from the oil storage part to the compression chamber is made by the differential pressure of the oil storage part with the relatively high pressure and the compression chamber with the low pressure. There is an advantage of being inexpensive.

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

1 is a view schematically showing 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 in FIG. 1, FIG. 3 is a cross-sectional view of II in FIG. 2. 4 is a view showing another example of the II cross section in FIG. 2, FIG. 5 is a view showing the II-II cross section in FIG. 2, FIG. 6 is a view showing the upper surface of the pump cover in FIG. to be.

First, a hermetic compressor according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 and 2, the hermetic compressor 100 according to the present embodiment forms a main configuration of a refrigeration cycle together with the condenser 20, the expander 30, and the evaporator 40. In this case, the casing The suction pipe 113 coupled to the 110 is connected to the evaporator 40 of the refrigeration cycle, the discharge pipe 114 is connected to the condenser 20 of the refrigeration cycle.

Here, in the pipe connecting the discharge side of the hermetic compressor 100 and the inlet side of the condenser 20, oil mixed in the refrigerant discharged through the discharge tube 114 is separated into the internal space of the hermetic compressor 100. Supplying oil separator 50 may be installed.

Meanwhile, the hermetic compressor 100 includes a compressor casing (hereinafter, abbreviated as 'casing') 110, a driving unit 120, a compression unit 130, and an oil supply unit 170.

The casing 110 is formed to have a closed inner space, a suction pipe 113 through which the low-pressure gaseous refrigerant passing through the evaporator 40 is introduced, and a discharge pipe 114 through which the compressed high-pressure gaseous refrigerant is discharged. ) Are combined.

The main frame 111, which supports one end of the drive unit 120 in the inner space of the casing 110, is driven by the drive unit 120 to compress the refrigerant 돠, the drive unit 120 Subframe 112 supporting the other end of the) is fixedly installed.

On the other hand, the lower half of the compressor casing 110 is provided with an oil supply hole 115 for injecting oil into the inner space of the compressor casing 110.

The oil supply hole 115 may be utilized as a homogeneous hole for communicating 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 addition, the bottom of the casing 110 is provided with a storage oil portion 116 for storing oil for lubricating or cooling the drive unit 120 and the compression unit 130.

The oil stored in the oil storage part 116 is supplied to the compression unit 130 through the operation of the driving unit 120 or the oil supply unit 170.

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

The drive 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 rotary shaft 123 is coupled to the center of the rotor 122, is supported by the main frame 111 and the subframe 112, the rotational force of the rotor 121b the compression unit 130 To pass). In addition, the oil passage 123a is formed in the axial direction of the rotary shaft 123 so that the oil supplied to the compression unit 130 passes.

Here, the drive motor 120 is an inverter motor that can be used to vary the rotation speed.

On the other hand, it may be provided with an oil recovery unit 140 that is linked to the rotary shaft 123 to suck the oil from the oil reservoir 116 into the oil passage (123a).

The oil recovery unit 140 may be provided in various forms, and an example thereof will be described below.

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

The fixed scroll 131 is coupled to the main frame 111 and is fixed, and the check valve 134 for blocking the reverse flow of the discharge gas discharged through the discharge port 131c and the discharge port 131c discharged from the compressed refrigerant ) May be included.

The pivoting scroll 132 is supported by the main frame 111 and is engaged with the fixed scroll 131 and is pivoted by the rotating shaft 123.

In this case, an old dam ring 133 may be provided between the swing scroll 132 and the main frame 111 to induce a swing movement of the swing scroll 132.

In addition, the fixed scroll 131 and the rotating scroll 132 is formed in a spiral, respectively, the fixed wrap 131a and the rotating wrap 132a which are engaged with each other to form two pairs of compression chambers P in succession.

On the other hand, a suction pipe 113 for guiding the refrigerant from the refrigerating cycle is directly connected to the suction port 131b of the fixed scroll 131, and the discharge port 131c of the fixed scroll 131 is an inner space of the casing 110. Is in communication with.

As a result, the inner space of the casing 110 is filled with a refrigerant having a pressure equal to the discharge pressure, and this type of hermetic compressor is referred to as a 'high pressure hermetic compressor'.

Therefore, in the hermetic compressor 100 according to the present embodiment, the oil is supplied through the oil supply unit 170 by the pressure difference between the compression unit 130 and the oil storage unit 116.

The oil supply unit 170, the oil storage unit 116 is located in the lower portion of the compressor 100 and the oil is stored in communication with the compression unit 130 located in the upper portion of the compressor 100 to selectively select the oil It is provided to be supplied with.

In addition, the oil supply unit 170 is provided to operate when the rotational speed of the drive motor 121 constituting the drive unit 120 is less than a predetermined speed.

To this end, the oil supply unit 170, the oil supply pipe 171, the pressure reducing device 173 and the control valve 172.

The oil supply pipe 171 is provided so that the oil storage part 116 and the compression unit 130 inside the casing 110 in which oil is stored communicate with each other. Therefore, one end thereof is provided to be immersed in the oil storage part 116, and the other end thereof is provided to communicate with the compression chamber P of the compression unit 130.

A detailed description of the compression chamber P through which the oil supply pipe 171 communicates will be described later.

The pressure reducing device 173 prevents backflow of oil by lowering the pressure of the oil moved from the oil storage part 116. In addition, an appropriate amount of oil is supplied to the compression chamber (P).

The control valve 172 is controlled to open the oil supply pipe 171 when the rotational speed of the drive motor 121 is less than or equal to a preset speed.

As a result, when the rotational speed of the drive motor 121 is greater than or equal to a predetermined speed, oil is supplied to the compression unit 130 by an oil recovery unit 140 that operates in conjunction with the rotation shaft 123. When the rotational speed of the driving motor 121 is less than or equal to a preset speed, oil is additionally supplied through the oil supply unit 170 in addition to the oil supply by the oil recovery unit 140.

Therefore, it is possible to compensate for the lack of oil due to the low speed rotation of the rotary shaft 123. In addition, during the medium / high speed rotation of the rotary shaft 123 to prevent the problem of excessive supply of oil.

On the other hand, in the present embodiment, the control valve 172 is preferably provided on the rear of the pressure reducing device 173 based on the supply direction of the oil.

That is, by passing the relatively high pressure oil through the pressure reducing device 173 and passing through the control valve 172, it is possible to reduce the power consumption for opening and closing the control valve 172.

Next, in the hermetic compressor 100 according to the present embodiment, a compression chamber P in which oil is supplied through the oil supply unit 170 will be described with reference to FIGS. 3 and 4.

Referring to Figure 3, in the present embodiment, the compression chamber (P) is formed in a pair in a position symmetrical with respect to the center of the fixed scroll (131), the internal pressure is provided to be equal to each other, The oil supply pipe 171 is provided to communicate with the pair of compression chambers at the same time.

As described above, the compression chamber (P) is moved to the center portion of the fixed scroll 131 according to the rotation of the swing scroll 132 to compress the refrigerant therein, the internal pressure of the pair of compression chamber Silver may be provided at the same pressure by making the moving distance of each compression chamber by the turning rotation of the turning scroll 132 the same.

On the other hand, in the present embodiment, the oil supply pipe 171 is preferably provided in communication with the pair of compression chamber in the step of starting compression. That is, it is preferable that the oil supply pipe 171 is provided to supply oil to the compression chamber immediately after the compression chamber is generated by the fixed wrap 131a and the swing wrap 132a.

As a result, the oil is smoothly supplied to the compression chamber in a relatively low pressure state, and since the volume of the compression chamber is formed, the problem of specific volume increase of the refrigerant due to the oil in the relatively high temperature state is prevented.

On the other hand, in the present embodiment, the ends of the oil supply pipe 171 is connected to each of the pair of compression chambers, it is preferable that the oil is provided to be simultaneously supplied to each compression chamber through the oil supply pipe 171. .

To this end, the oil supply pipe 171 may be branched to communicate with each compression chamber, but a pair of oil supply passages 171a and 171b communicate with the compression chamber are formed in the fixed scroll 131. Ends of the oil supply passages 171a and 171b are preferably provided to communicate with the oil supply pipe 171.

At this time, it is preferable that the length of the pair of oil supply passages 171a and 171b are equally provided such that the amount of oil supplied through the oil supply passages 171a and 171b is the same.

On the other hand, in the present embodiment, the end of the oil supply passage (171a, 171b) or the end of the oil supply pipe 171 is in communication with the compression chamber is the turning scroll 132 as the turning wrap 132a It is preferred that any point of) be positioned at the center of the moving circle trajectory.

As a result, as the turning scroll 131 rotates, the oil supplied through the ends of the oil supply passages 171a and 171b or the ends of the oil supply pipe 171 are alternately supplied to the pair of compression chambers. do.

On the other hand, referring to Figure 4, in the hermetic compressor 100 according to the present embodiment, the compression chamber (P) is formed in a pair in a position symmetrical with respect to the center of the fixed scroll (131), each compression chamber It may be provided with different internal pressures.

This is called "asymmetrical" to be distinguished from the "symmetrical" described above.

In this case, since the compression of the refrigerant starts from a position close to the suction part 131b of the compression space formed by the fixed wrap 131a of the fixed scroll 131, the performance of the compression is increased.

In this case, the end of the oil supply pipe 171 is formed in a position in communication with the pair of compression chambers alternately.

Therefore, it is preferable that the end of the oil supply pipe 171 is installed to be located at the center of the circle trajectory in which any point of the turning wrap 132a moves as the turning scroll 132 rotates.

Next, in the hermetic compressor 100 according to the present embodiment, the configuration and operation of the oil separator 50 and the oil recovery unit 140 will be described.

The oil separator 50 is a device for separating oil from the refrigerant discharged to the outside of the casing 110, is connected to the discharge pipe 114 of the compressor 100, the refrigerant separated oil is discharge pipe Supplyed to the condenser 20 through 55, the separated oil is stored in the oil storage unit 116 through the oil recovery unit 140 to be described later.

The oil separator 50 is formed in a cylindrical shape having a closed inner space and arranged side by side on the casing 110, and the oil separator 50 is connected to an oil recovery pipe 53 to connect the casing. It may be supported by (110) or may be supported by a separate support member 52, such as a clamp that is fixed to the casing 110 wrapped around the oil separator (50).

In addition, a mesh screen is installed in the inner space of the oil separator 50 so that the refrigerant and the oil are separated or the discharge pipe 114 is connected to be offset (off-set) with respect to the axis center of the oil separator 50. 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.

On the other hand, the oil recovery unit 140 is coupled to the rotary shaft 123 is driven to generate a variable volume portion (150a) and pumped by using the variable volume portion (150a), the A pump cover 142 for accommodating an oil pump 150 and coupled to the pump housing 141 installed inside the casing 110 and the pump housing 140 to supply oil to the oil pump 150 is provided. It may include.

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

The oil pump 150 is composed of a volume pump for pumping oil while varying in volume, such as a trocoid gear pump.

As a result, the oil pump 150 is operated by the rotary shaft 123 and pumps oil separated from the oil filled in the inner space of the casing 110 or the refrigerant discharged from the compression unit 130, and The pumped oil is moved upward along the oil flow path 123a of the rotary shaft 123 to lubricate the compression unit 130 and to cool the driving motor 120.

The pump cover 142 is provided with a first suction port 142a for recovering oil separated from the oil separator 50 and a second suction port 142b for recovering oil from the bottom surface of the casing 110.

The first suction port 142a is formed in a radial direction so as to communicate with the oil return pipe 53, and the second suction port 142b is configured to communicate with an oil suction pipe 148 that sucks oil filled in the casing 110. It is formed in the axial direction.

Therefore, the oil suction pipe 148 is preferably formed such that its inlet end is immersed in the oil filled in the casing 110.

In addition, the pump cover 142, the communication groove 153 is formed in the center of the upper surface so that the oil flow path (123a) of the rotary shaft 123 communicates.

Around the one side of the communication groove 153, that is, the first suction guide groove for communicating the variable volume portion 150a formed by the inner gear 151 and the outer gear 152 and the first suction port 142a. 154 is formed in an arc shape.

A second suction guide groove 155 communicating with the second suction port 142b is formed in an arc shape at a position circumferentially spaced from the first suction guide groove 154.

In addition, at the position circumferentially spaced apart from the first suction guide groove 154 and the second suction guide groove 155, the discharge guide groove 156 for discharging the oil pumped by the oil pump 150 is a circle. It is formed into an arc.

In addition, a discharge slit 157 is formed on the inner wall of the discharge guide groove 156 so as to communicate with the communication groove 153.

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

The suction volume V1 is formed to gradually increase in volume along the rotational direction of the inner gear 151 from the circumferential start end to the end of the suction guide groove 155, and the discharge volume V2 is The volume is reduced in the rotational direction of the inner gear 151 from the start end to the end of the discharge guide groove 156 and subsequent to the suction volume V1.

The oil separated from the oil and the refrigerant in the casing 110 using the oil pump 150 as described above is recovered and supplied to the compression unit 130 as follows.

The inner gear 151 of the oil pump 150 is coupled to the rotary shaft 123 to perform eccentric rotation, and between the inner gear 151 and the outer gear 152 between the suction volume V1 and the discharge volume. (V2) is formed.

The first suction port 142a and the second suction port 142b communicate with the suction volume V1.

Therefore, the oil separated from the oil separator 50 flows into the first suction guide groove 154 through the oil return pipe 53 through the first suction port 142a, and into the second suction port 142b. The oil filled on the bottom side of the casing 110 flows into the second suction guide groove 142b through the oil suction pipe 148.

The oil introduced into the first suction guide groove 142a is contained in the suction volume part V1 and flows into the second suction guide groove 142b through the partition wall, and flows into the second suction guide groove 142b. The oil is moved from the suction volume V1 to the discharge volume V2.

The oil moved to the discharge volume V2 flows into the discharge guide groove 156, and the oil introduced into the discharge guide groove 156 is discharged on the inner circumferential wall of the discharge guide groove 156. 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 flow path 123a of the rotation shaft 123.

The oil sucked into the oil passage 123a is pushed up through the oil passage 123a and then upwardly lifted by the centrifugal force of the rotary shaft 123, and a part thereof is supplied to each bearing surface while the rest is at the top. It is scattered in and repeats a series of processes flowing into the compression unit 130.

Hereinafter, a hermetic compressor according to another embodiment of the present invention will be described in detail with reference to FIG. 7.

However, in the description, a configuration overlapping with the above-described embodiment of the present invention and a detailed description thereof will be replaced with the above description and will be omitted below.

7 is a longitudinal sectional view showing the inside of a hermetic compressor according to another embodiment of the present invention.

Referring to FIG. 7, the hermetic compressor 200 according to the present embodiment has the same configuration as most of the above-described embodiments, but the oil supply unit 270 is positioned inside the casing 110 of the hermetic compressor 200. There is a difference in being.

As a result, the space occupied by the hermetic compressor 200 may be reduced, and the oil supply unit 270 may have an advantage of preventing a strength problem and noise caused by vibration that may occur due to the external location.

Hereinafter, with reference to Figure 8 for a hermetic compressor according to another embodiment of the present invention will be described in detail.

However, in the description, a configuration overlapping with the above-described embodiment of the present invention and a detailed description thereof will be replaced with the above description and will be omitted below.

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

Referring to FIG. 8, the hermetic compressor 300 according to the present embodiment has the same configuration as the other embodiment described above, but in this embodiment, the oil supply unit 370 includes the casing 110 in which oil is stored. Oil separator 50 for separating the oil from the refrigerant discharged from the oil supply pipe 371, the oil supply pipe 317 and the compression unit 130 in communication with the oil storage unit 116 and the compression unit 130 therein. Is installed in the recovery pipe 53 and the oil supply pipe 371 that communicate with the outlet of the pump, and open the oil supply pipe 371 when the rotational speed of the driving motor 121 is lower than or equal to a preset speed. There is a difference in that it comprises a pressure reduction device 372 provided in the valve 373 and the oil supply pipe 371 to lower the pressure of the oil.

As a result, while sufficient oil can be supplied during low-speed rotation of the drive motor 121, the oil supply efficiency can be improved by directly supplying the oil separated from the oil separator 50 to the compression chamber P. There is an advantage.

On the other hand, in the present embodiment, the recovery pipe 53 may be further provided with a check valve (53a) to prevent the oil recovered from the oil separator 50 to flow back to the oil separator (50). have.

Hereinafter, a hermetic compressor according to another embodiment of the present invention will be described in detail with reference to FIG. 9.

However, in the description, a configuration overlapping with the above-described embodiment of the present invention and a detailed description thereof will be replaced with the above description and will be omitted below.

9 is a longitudinal sectional view showing the inside of a hermetic compressor according to another embodiment of the present invention.

Referring to FIG. 9, the hermetic compressor 400 according to the present embodiment has the same configuration as the above-described embodiment, but the oil supply unit 470 according to the present embodiment includes an inner space of the casing 110. Back pressure is formed by the fixed scroll 131 is fixed to the rotating scroll 132 and the rotating scroll 132 and the casing 110 by the driving motor 121 to the fixed scroll 131 There is a difference in that the space 433 is provided so as to communicate with the oil storage part 116.

In the case of the back pressure space (433) is a space in which a pressure between the suction pressure and the discharge pressure is generally applied to the back pressure space (433) to prevent the leakage of the refrigerant from the compression chamber (P) by supplying a relatively high pressure oil There is an advantage.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential characteristics thereof, and therefore, the embodiments described above should not be limited by the contents of the detailed description, and also described above. Even if the embodiments are not listed one by one in the detailed description, they should be broadly interpreted within the spirit and scope defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1 is a view schematically showing 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 in FIG. 1; FIG.

3 is a cross-sectional view of the I-I in Figure 2,

4 is a view showing another example of an I-I cross section in FIG.

FIG. 5 is a cross-sectional view of II-II in FIG. 2;

Figure 6 is a view showing the upper surface of the pump cover in Figure 2,

7 is a longitudinal sectional view showing the inside 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 according to another embodiment of the present invention;

9 is a longitudinal sectional view showing the inside of a hermetic compressor according to another embodiment of the present invention.

Claims (10)

A casing having a sealed inner space and connected to a suction pipe and a discharge pipe; A driving unit installed in the inner space and generating a driving force; A compression unit installed in the inner space and operated by the driving unit to compress the refrigerant; And And an oil supply unit for selectively supplying the oil stored in the casing to the compression unit. According to claim 1, wherein the oil supply unit, Hermetic compressor for supplying oil to the compression unit when the rotational speed of the drive unit is less than the predetermined speed. According to claim 1, wherein the oil supply unit, A hermetic compressor for supplying oil to a compression chamber formed by a fixed wrap of a fixed scroll fixed to an inner space of the casing and a pivoting wrap of a rotating scroll rotating about the fixed scroll by the driving unit. The method of claim 3, wherein The compression chamber in which oil is supplied is a hermetic compressor of a compression chamber at which compression of a refrigerant starts. According to claim 1, wherein the oil supply unit, An oil supply pipe for communicating oil reservoir with the compression unit inside the casing in which oil is stored; A control valve installed in the oil supply pipe and controlled to open the oil supply pipe only when the rotational speed of the driving unit is less than or equal to a preset speed; And And a pressure reducing device provided in the oil supply pipe to lower the pressure of oil. The method of claim 5, wherein the pressure reducing device, Hermetic compressor located in front of the control valve based on the movement direction of the oil. 6. The hermetic compressor according to claim 5, wherein the oil supply unit is installed in an inner space of the casing. According to claim 1, wherein the oil supply unit, An oil supply pipe for communicating oil reservoir with the compression unit inside the casing in which oil is stored; A recovery pipe communicating with the oil supply pipe and an outlet of an oil separator for separating oil from refrigerant discharged from the compression unit; A control valve installed in the oil supply pipe to open the oil supply pipe when the rotational speed of the drive unit is equal to or less than a preset speed; And And a pressure reducing device provided in the oil supply pipe to lower the pressure of oil. The method of claim 8, wherein the recovery pipe, And a check valve further preventing oil from flowing back from the recovery pipe to the inside of the oil separator. According to claim 1, wherein the oil supply unit, A fixed scroll fixed to the inner space of the casing, a swing scroll pivoting with respect to the fixed scroll by the drive unit, and a back pressure space formed by an inner wall surface of the casing and a closed type communicating with the oil storage part. compressor.

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