JPH11303751A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an oil separation and noise reduction in a hermetic- compressor muffler. SOLUTION: This hermetic compressor comprises a partition plate 17 partitioning a space inside a muffler 16 into inner and outer spaces, an oil separation passage formed in the partition plate 17 so as to connect the inner space and the outer space inside the muffler 16, a muffler inlet 19 formed in the inner space inside the muffler 16, and a muffler outlet 20 connecting the inner space inside the muffler 16 to a cylinder 15. In this case, cold gas that flows into the muffler 16 forms a flow along the partition plate 17 and oil whose relative density is larger than that of the cold gas is stored in the outer space outside the partition plate 17 via the oil separation passage by centrifugal force. Accordingly, the amount of the oil is kept appropriate so that the performance stabilizes, and thus the high reliability is provided. Also, by the oil separation passage attenuating a pressure pulse, a noise thereof can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used for a refrigerator or the like.

[0002]

2. Description of the Related Art In recent years, hermetic compressors (hereinafter referred to as compressors) are required to have high energy efficiency, and there is a direct suction system as a suction system therefor. This prior art is disclosed, for example, in Japanese Utility Model Laid-Open No. 58-63382.

An example of the above-mentioned conventional suction system will be described below with reference to the drawings. FIG. 16 is a front view of a conventional compressor, and FIG. 17 is an EE of the conventional compressor in FIG.
18 is a front view of a muffler of a conventional compressor, wherein 1 is a closed container, 2 is a closed container 1
A mechanical unit 3 elastically supported therein has a motor unit 3 disposed above the mechanical unit 2 and a cylinder head 4 constituting the mechanical unit 2. Reference numeral 5 denotes a muffler inlet passage, and reference numeral 6 denotes a muffler into which the muffler inlet passage 5 is inserted. 7 is a muffler 6
And a muffler outlet channel connecting the cylinder head 4 to the muffler.
Reference numeral 8 denotes a suction pipe that penetrates the airtight container and rises inward. Reference numeral 9 denotes a contact coil spring interposed between the muffler inlet flow path 5 and the suction pipe 8.

[0004] Reference numeral 10 denotes oil, 11 denotes an oil capillary having one end opened into the muffler 6 and the other end opened into the oil 10, 12 denotes a steel strip having spring properties, and 13 denotes a muffler 6
And an oil capillary 11 at the same time via a steel strip 12 having spring properties. 14 is a piston and 15 is a cylinder.

[0005] Regarding the compressor configured as described above,
The operation will be described below. The motor unit 3 drives the piston 14 and the like of the mechanical unit 2, and the refrigerant gas is sucked into the muffler 6 from the external cooling circuit (not shown) through the suction pipe 8, the tight coil spring 9, and the muffler inlet channel 5. This refrigerant gas is intermittently sucked into the cylinder 15 through the muffler outlet flow path 7 and the inside of the cylinder head 4.

At this time, the refrigerant gas is hardly leaked into the closed vessel 1 and is sucked into the muffler at a relatively low temperature because there is almost no gap between the close contact coil springs 9. Therefore, the temperature of the refrigerant gas finally sucked into the cylinder 15 is lower than that of the case where the refrigerant gas is once opened into the closed vessel 1 and then sucked into the muffler 6 without the close contact coil spring 9. And the suction mass of refrigerant gas per unit time (refrigerant circulation amount) increases. As a result, the refrigerating capacity is improved, and the efficiency of the hermetic compressor is improved.

The noise generated in the vicinity of the cylinder 15 is attenuated by the space in the muffler 6, and the noise transmitted from the muffler inlet channel 5 to the suction pipe 8 is reduced.

[0008]

However, in the conventional structure described above, the shape of the muffler 6 is box-shaped, the flow of the refrigerant gas is complicatedly disturbed, and stagnation is formed in many places. It becomes loud and generates noise. Further, there is a disadvantage that the oil in the refrigerant gas is not sufficiently separated, and the refrigeration capacity may be reduced due to an increase in the amount of oil taken into the mechanical part.

The present invention solves the conventional problem. The refrigerant gas flowing into the muffler 6 sufficiently separates the oil in the muffler 6 so that excessive oil does not flow into the mechanical section 2 to improve the refrigeration capacity. The effect was obtained. At the same time, another object of the present invention is to provide a hermetic compressor capable of reducing noise by reducing pressure pulsation.

In addition, the above-described conventional configuration has a drawback that a large amount of oil 10 may flow into the mechanical unit 2 because oil is returned from the external cooling circuit at the time of starting operation or the like. Further, at the time of stable operation, the muffler 6 has a drawback that the performance of the muffler 6 may be lowered by absorbing the heat in the closed vessel 1 and increasing the refrigerant gas temperature.

Another object of the present invention is to reduce the amount of oil 1 in the muffler 6 when the amount of oil returned during startup operation is large.
0 is efficiently separated to prevent start-up failure and improve reliability. It is another object of the present invention to provide a hermetic compressor in which a low-temperature refrigerant gas flows into the mechanical section 2 when the amount of returned oil is small, thereby improving the refrigerating capacity.

In the above-described conventional configuration, the temperature of the sealed container 1 rises during operation at high outside air temperature, so that the muffler 6
The temperature of the refrigerant gas in the muffler 6 rises due to the influence of the heat in the closed vessel 1, and the density of the refrigerant gas decreases. As a result, there is a disadvantage that the refrigeration capacity may be reduced.

Another object of the present invention is to suppress the rise in temperature due to the heat received by the refrigerant gas by shortening the volume of the refrigerant gas flowing through the muffler 6 and the length of the flow path during high ambient temperature operation in which the refrigerant gas temperature rises. It is another object of the present invention to provide a hermetic compressor capable of preventing a decrease in refrigeration capacity.

In the above-described conventional configuration, when an inverter device is provided for controlling the rotation speed, the flow rate of the refrigerant gas flowing into the muffler 6 during the high rotation speed operation is lower than the flow speed during the low rotation speed operation. Therefore, there is a disadvantage that the pressure loss at the muffler or the like becomes large and the pressure of the refrigerant gas sucked into the mechanical unit 2 decreases, so that the refrigerating capacity may decrease.

Another object of the present invention is to reduce the pressure drop caused by a muffler or the like with an increase in the flow rate and increase the refrigerant gas flowing into the machine section 2 at the time of high rotation speed operation, thereby increasing the refrigeration capacity. It is an object of the present invention to provide a hermetic compressor capable of improving the performance.

[0016]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a motor unit, a mechanical unit including a piston, a cylinder, and the like, a closed container containing the motor unit and the mechanical unit and storing oil. , A muffler, a partition plate that partitions the space inside the muffler into an inside space and an outside space, an oil separation passage provided in the partition plate that communicates the inside space and the outside space inside the muffler, and an inside divided by the muffler partition plate And a muffler outlet flow path that communicates the cylinder with the inner space divided by the muffler partition plate.

As a result, the refrigerant gas flowing into the muffler from the muffler inlet passage sufficiently separates the oil in the muffler so that excessive oil does not flow into the mechanical section, thereby obtaining an effect of improving the refrigerating capacity. at the same time,
Noise can be reduced by reducing the pressure pulsation.

Further, the present invention is configured such that an on-off valve for opening and closing the oil separation passage is further provided to the invention described in claim 1.

Thus, the oil can be efficiently separated in the muffler against the oil return phenomenon at the time of start-up operation and the like, and start-up failure is prevented, and the refrigeration capacity is reduced by flowing the low-temperature refrigerant gas into the mechanical section. Can be improved.

The present invention also provides a motor unit, a mechanical unit including a piston, a cylinder, and the like, a sealed container containing the motor unit and the mechanical unit and storing oil, a muffler, and a multi-chamber muffler space. The split valve for splitting and the temperature operating mechanism for adjusting the opening and closing of the split valve are provided.

In this way, the volume of the refrigerant gas flowing through the muffler during operation at high outside air temperature where the temperature of the refrigerant gas rises is reduced, the flow path is shortened, the temperature rise due to the reception of the refrigerant gas is suppressed, and the refrigerating capacity is reduced. The drop can be prevented.

The present invention also provides a motor unit, an inverter device for operating the motor unit, a mechanical unit including a piston and a cylinder, a sealed container containing the motor unit and the mechanical unit and storing oil, and a muffler. And an auxiliary passage for communicating the space in the muffler with the space in the sealed container, and an auxiliary passage opening / closing valve for opening and closing the auxiliary passage.

As a result, during high-speed operation, the pressure drop generated in the muffler or the like due to the increase in the flow velocity is reduced, and the amount of the refrigerant gas flowing into the machine section is increased. As a result, the refrigeration capacity can be improved.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a motor unit, a mechanical unit including a piston, a cylinder, and the like; a closed container containing the motor unit and the mechanical unit and storing oil; A muffler, a partition plate that partitions the space inside the muffler into an inside space and an outside space, an oil separation passage provided in the partition plate that communicates the inside space and the outside space inside the muffler, and an inner space divided by the muffler partition plate. A muffler inlet flow path that opens into the space, and a muffler outlet flow path that communicates the cylinder with the inner space divided by the muffler partition plate, and the refrigerant that flows into the muffler inner partition plate from the muffler inlet flow path When the gas forms a flow along the partition plate, the oil having a higher specific gravity than the refrigerant passes through the oil separation passage under centrifugal force and is stored in the space outside the partition plate. The refrigerant density is small to form a flow along the inner space of the partition plate. As a result, oil separation is performed, and the amount of oil in the refrigerant gas flowing into the cylinder via the muffler outlet flow path is appropriately maintained, so that the refrigerating capacity is improved and high reliability is obtained. Further, the oil separation passage has a function of reducing noise by sharing the space as a space for attenuating pressure pulsation generated by the refrigerant gas flowing into the muffler.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, an on-off valve for opening and closing the oil separation passage is provided, and the liquid is returned from the external cooling circuit at the time of starting operation or the like. When oil occurs or when the amount of oil returned is large due to operating conditions, excessive oil sucked into the muffler collides with the on-off valve with a large momentum to push the on-off valve and push it out into the space outside the partition plate. It is. As a result, the amount of oil in the refrigerant gas flowing into the cylinder via the muffler outlet flow path is appropriately maintained, thereby preventing start-up failure and having an effect of obtaining high reliability. When the oil return amount is small, the momentum of the lubricating oil colliding with the on-off valve is small, so the oil separation passage is closed, and the muffler has a double-enclosed structure and is absorbed from the enclosed space. Since the influence of the heat is reduced, the refrigerant gas flowing into the muffler is guided to the cylinder while maintaining a low temperature. As a result, it has the effect of obtaining a higher refrigeration capacity than a muffler without an on-off valve.

According to a third aspect of the present invention, there is provided a motor unit,
A mechanical unit including a piston, a cylinder, and the like, a sealed container that stores the motor unit and the mechanical unit and stores oil,
It consists of a muffler, a dividing valve that divides the space inside the muffler into multiple chambers, and a temperature operating mechanism that adjusts the opening and closing of the dividing valve.
During high ambient temperature operation in which the temperature of the closed vessel and the refrigerant gas rises, the temperature operating mechanism operates the dividing valve to divide the muffler into multiple chambers, resulting in a flow path from the muffler inlet flow path to the muffler outlet flow path. Is shortened and the volume is reduced, so that heat reception of the refrigerant gas from the muffler is suppressed, and a high-density refrigerant gas can be sucked. Therefore, there is an effect that a higher refrigerating capacity can be obtained than a muffler whose flow path is not shortened.

According to a fourth aspect of the present invention, there is provided a motor unit,
An inverter device that drives the motor, a piston,
Open / close the mechanical section consisting of a cylinder, etc., the sealed container containing the motor section and the machine section and storing oil, the muffler, the auxiliary passage connecting the space inside the muffler and the space inside the sealed container, and the auxiliary passage During high-speed operation, the flow rate of the refrigerant gas flowing through the muffler and the like becomes larger than during low-speed operation, so that a pressure drop occurs, and the pressure difference between the closed vessel and the muffler is reduced. As the size increases, the on-off valve opens to suck the refrigerant gas in the closed container and increase the refrigerant gas flowing into the mechanical unit. As a result, it has the effect of improving the refrigeration capacity during high-speed operation. At a low rotation speed, the pressure difference between the inside of the closed vessel and the muffler becomes small, so that the on-off valve closes and functions as a conventional muffler.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hermetic compressor according to the present invention will be described below with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a front view of a hermetic compressor according to a first embodiment of the present invention, and FIG. 2 is a sectional view of the hermetic compressor of the embodiment taken along line AA of FIG. And FIG.
FIG. 4 is a sectional view of an essential part of the hermetic compressor of the embodiment taken along the line BB in FIG. 1, and FIG.
FIG. 3 shows a detailed view of an oil separation passage.

In FIGS. 1, 2, 3 and 4, reference numeral 17 denotes a cylindrical partition plate for partitioning the space inside the muffler 16 into an inner space and an outer space. Reference numeral 18 denotes a partition plate provided on the partition plate 17. It is an oil separation passage which communicates the space inside and outside of the oil passage. Reference numeral 19 denotes a muffler inlet passage that opens into an inner space divided by the partition plate 17 of the muffler 16.
Reference numeral 20 denotes a muffler outlet flow path that communicates the inner space divided by the muffler partition plate 17 with the cylinder 15, and is provided at the center of the cylindrical partition plate 17.

The operation of the hermetic compressor constructed as described above will be described below. FIG. 3 shows the flow of the refrigerant gas in the hermetic-type compressor of this embodiment. The flow from the external cooling circuit to the inner side of the partition plate 17 inside the muffler 16 via the suction pipe 8, the tight coil spring 9, and the muffler inlet flow path 19. The refrigerant gas flowing into the partition plate 17
A flow is formed along 7. At this time, the oil 10 in the refrigerant gas is conveyed to the space outside the partition plate 17 through the oil separation passage 18 by centrifugal force, and the refrigerant flows inside the partition plate 17. Then, the refrigerant flows along the partition plate 17 and finally flows from the muffler outlet flow path 20 to the cylinder 1.
Flow to 5. Since the amount of the oil 10 in the refrigerant gas sucked into the cylinder 15 is suppressed by the above refrigerant flow, the performance and performance are stable, and high reliability is obtained.

The partition plate 1 in which the oil 10 is stored
Noise can be reduced by sharing the space outside of 7 as a space for reducing the pressure amplitude of the refrigerant gas.

Next, the above-described oil separation phenomenon will be specifically described with reference to FIG. In the hermetic compressor of this embodiment, as shown in FIG. 4, the refrigerant gas flowing from the muffler inlet passage 19 is supplied to the partition plate 17 by the curvature of the partition plate 17.
Along the muffler 16. In the oil separation passage 18, the oil 10 in the refrigerant gas has a higher specific gravity than the refrigerant, so that the oil 10 is added in the tangential direction of the flow, and further centrifugal force is applied to the oil 10 to be discharged to the space outside the partition plate 17 through the oil separation passage 18. Is done. On the other hand, the refrigerant proceeds along the partition plate 17 as it is, and is taken into the cylinder 15 through the muffler outlet channel 20. As a result, the amount of oil in the refrigerant gas is kept at an appropriate level, and the refrigeration capacity can be improved.

As described above, the hermetic compressor of this embodiment is
A muffler 16, a partition plate 17 for dividing a space inside the muffler 16 into an inside space and an outside space, an oil separation passage 18 provided in the partition plate and communicating between the inside and outside space inside the muffler 16, a partition plate for the muffler 16 A muffler inlet flow path 19 that opens into an inner space divided by 17, and a muffler outlet flow path 20 that communicates the inner space and the cylinder 15 divided by the partition plate 17 of the muffler 16. Muffler 1 from muffler inlet channel 19
When the refrigerant gas flowing into the inside of the partition plate 17 of 6 forms a flow along the partition plate 17, the oil 10 having a higher specific gravity than the refrigerant passes through the oil separation passage 18 under centrifugal force, and It is stored in the outer space. On the other hand,
The refrigerant having a low specific gravity forms a flow along the space inside the partition plate 17. As a result, the oil is separated, and the amount of oil in the refrigerant gas flowing into the cylinder 15 via the muffler outlet flow path 20 is appropriately maintained, so that the performance is stable,
It has the effect of obtaining high reliability, and the noise can be reduced by sharing the oil separation passage 18 as a space for attenuating the pressure pulsation generated from the refrigerant gas flowing into the muffler 16.

Regarding the muffler outlet flow path 20, the same effect can be obtained by setting the partition plate 17 at a position other than the center and inserting the flow path into the muffler 16 by opening the space inside the partition plate 17.

Further, the muffler inlet pipe 19 can be installed in addition to the end face of the partition plate 17 and the end face of the muffler 16, and the same effect can be obtained by opening the space inside the partition plate 17 of the muffler 16. Is obtained.

Even if the shape of the partition plate 17 is other than a cylinder, the same effect can be obtained if oil separation is performed in the oil separation passage 18.

(Embodiment 2) FIG. 5 is a cross-sectional view of a principal part taken along line AA in FIG. 1 when a large amount of oil is used in a hermetic compressor in Embodiment 2 of the present invention. FIG. 2 is a sectional view of an essential part taken along line AA in FIG. 1 when the amount of oil of the hermetic compressor of the embodiment is small.

5 and 6, reference numeral 21 denotes an on-off valve for opening and closing the oil separation passage. In this embodiment, 21 is further provided in the hermetic compressor according to the first embodiment.

The operation of the hermetic compressor constructed as described above will be described below. In general, a large amount of oil or liquid refrigerant stored in the external cooling circuit flows into the mechanical section during a start-up operation or the like. Oil and liquid refrigerant that has entered the cylinder may cause liquid compression, and by eliminating excess oil and liquid refrigerant on the path before flowing into the cylinder, start-up failures are reduced,
High reliability can be ensured by stabilizing the refrigeration capacity.

In the hermetic compressor of the second embodiment, when the oil returns from the external cooling circuit during startup operation or the like, the refrigerant gas flowing into the muffler 16 reaches the oil dividing passage 18 along the partition plate 17. Since the momentum of the oil colliding with the on-off valve due to excessive oil 10 is large, the on-off valve 21 is pushed open to separate the oil 10 into the partition plate 1 as shown in FIG.
To the space outside of 7. As a result, liquid compression caused by a large amount of oil return at the time of starting or the like was prevented, and stable operation was realized. Also, during stable operation, as shown in FIG. 6, normally, the oil amount of the refrigerant gas is stable, so the on-off valve 21 is closed, and the refrigerant gas flows only inside the partition plate 17, so that the refrigerant gas is received from the closed vessel 1. By suppressing the influence of heat, the concentration of the refrigerant gas sucked into the cylinder 15 is increased, and the performance can be improved.

As described above, the hermetic compressor of the present embodiment
The hermetic compressor according to the first embodiment is further provided with an oil separation passage 21. When a large amount of oil is returned from the external cooling circuit during a start-up operation or the like, excessive oil 10 sucked into the muffler 16 is The large momentum collides with the on-off valve to push open the on-off valve 21 and is discharged to the space outside the partition plate 17. As a result, the muffler outlet flow path 20
Thus, the amount of oil in the refrigerant gas flowing into the cylinder 15 via the valve is properly maintained, so that starting failure is prevented and high reliability is obtained. When the oil return amount is small during stable operation or the like, since the momentum of the lubricating oil colliding with the on-off valve is small, the on-off valve 21 is in a state where the oil separation passage 18 is closed. , And the influence of heat obtained from the inside of the closed vessel 1 is reduced, so that the refrigerant gas flowing into the muffler 16 is guided to the cylinder 15 while maintaining a low temperature. As a result, the on-off valve 21
Thus, it is possible to obtain a higher refrigeration capacity than the muffler 16 having no refrigeration system.

The same effect can be obtained not only in the initial stage of starting the oil, but also in the case where excessive oil returns from the external cooling circuit during stable operation.

(Embodiment 3) FIG. 7 is a front view of a hermetic compressor according to a third embodiment of the present invention, and FIG. 8 is a cross-sectional view of the hermetic compressor taken along line CC in FIG. FIG. 9
FIG. 10 is a cross-sectional view of a main part of the muffler of the hermetic compressor of the embodiment at a low outside air temperature, and FIG. 10 is a cross-sectional view of a main part of the muffler of the hermetic compressor of the embodiment at a high outside air temperature.

In FIGS. 7, 8, 9 and 10, reference numeral 22 denotes a muffler, and reference numeral 24 denotes a temperature operating mechanism for controlling the opening and closing of a dividing valve 23 for dividing the space inside the muffler 22 into multiple chambers. A spring that sometimes extends and contracts when the temperature is low.

The operation of the hermetic compressor configured as described above will be described below. In general, during operation at a high outside air temperature, the muffler 2
Numeral 2 receives heat from inside the closed vessel 1 to increase the temperature of the refrigerant gas and decrease the density of the refrigerant gas. As a result, the refrigerating capacity is reduced, so that the performance can be maintained by preventing the temperature of the refrigerant gas flowing into the cylinder 15 from the external cooling circuit from increasing at the time of high outside air temperature operation.

The hermetic compressor according to the third embodiment operates at the temperature operating mechanism 2 when operating at a low outside air temperature, for example, at an outside air temperature of 10 ° C.
The pressure pulsation generated by the refrigerant gas is attenuated in the muffler 22 by reducing the noise by reducing the pressure of the pulsation generated by the refrigerant gas by making the split valve 23 have a large space inside the muffler 22 as shown in FIG. can do. On the other hand, outside temperature is 30 ℃
When the outside air temperature is high as described above, the temperature of the sealed container 1 and the refrigerant gas rises, and the spring as the temperature operating mechanism 24 extends to divide the dividing valve 23 into two chambers in the muffler 22 as shown in FIG. The path through which the refrigerant gas flows from the muffler inlet flow path 5 to the muffler outlet flow path 7 is shorter than the path at low outside air temperature, and the volume of the refrigerant gas is reduced, thereby reducing the influence of the heat received by the muffler 22 on the refrigerant gas. it can. As a result, it is possible to obtain a higher refrigerating capacity than the undivided muffler 22 at a low outside air temperature.

As described above, the hermetic compressor of the present embodiment includes the muffler 22, the dividing valve 23 for dividing the space inside the muffler 22 into multiple chambers, and the temperature operating mechanism 24 for adjusting the opening and closing of the dividing valve 23. During the high outside air temperature operation in which the temperature of the sealed container 1 and the refrigerant gas rises, the temperature operating mechanism 24 operates the dividing valve 23 to divide the inside of the muffler 22 into multiple chambers, and through the muffler inlet flow path 5 to the muffler outlet flow. Muffler 22 by shortening the path flowing to path 7 and reducing the volume.
The influence of the heat received by the refrigerant gas from the gas. As a result, a higher refrigerating capacity than the undivided muffler 22 can be obtained.

(Embodiment 4) FIG. 11 is a front view of a hermetic compressor according to a fourth embodiment of the present invention, and FIG. 12 is a cross-sectional view of the hermetic compressor taken along line DD in FIG. FIG. 13 shows a control block diagram of a refrigeration system including the hermetic compressor according to the embodiment, and FIG. 14 shows a cross-sectional view of a main part of the muffler of the hermetic compressor of the embodiment during low-speed operation. FIG. 15 is a sectional view of a main part of the muffler of the hermetic compressor of the embodiment at the time of high rotation speed operation.

FIG. 11, FIG. 12, FIG. 13, FIG. 14, FIG.
Reference numeral 26 denotes an inverter device that operates the motor unit 25 at at least two or more specific frequencies. 28
Reference numeral 29 denotes an auxiliary passage for communicating the space in the muffler 27 and the space in the closed casing 1, and reference numeral 29 denotes an auxiliary passage opening / closing valve for opening and closing the auxiliary passage 28.

The operation of the hermetic compressor constructed as described above will be described below. In general, when an inverter device is provided to perform rotation speed control, the flow rate of the refrigerant gas flowing into the muffler at a high rotation speed operation increases more than the flow speed at a low rotation speed operation. The loss increases and the pressure of the refrigerant gas sucked into the mechanical unit decreases, so that the refrigerating capacity decreases. Therefore, high refrigeration capacity can be obtained by increasing the amount of refrigerant gas to the cylinder without lowering the pressure in the muffler.

The hermetic compressor according to the present embodiment operates at a low rotational speed of, for example, a power supply frequency of 40 Hz.
And the pressure difference in the muffler 27 is small. Accordingly, as shown in FIG. 14, there is no movement of the gas refrigerant while the auxiliary passage opening / closing valve 29 is kept closed. On the other hand, for example, during high-speed operation at a power supply frequency of 70 Hz, a pressure drop occurs in the muffler 27 and the like due to an increase in the circulation amount. As shown, the auxiliary passage opening / closing valve 29 is opened to allow the refrigerant gas in the sealed container 1 to flow into the muffler 27 on the low pressure side. As a result, the refrigerant gas flowing into the cylinder 15 is replenished, and the refrigeration capacity at a high rotation speed can be improved.

As described above, in the hermetic compressor of the present embodiment, the inverter device 26 that operates the motor section 25 at at least two or more specific frequencies, and the auxiliary passage 28 includes the space inside the muffler 27 and the inside of the hermetic container. 1 space. Further, an auxiliary passage opening / closing valve 29 for opening and closing the auxiliary passage 28
In the high rotation speed operation, the flow rate of the refrigerant gas in the flow path before flowing into the muffler 27 increases compared to that in the low rotation speed operation, so that a pressure drop occurs. When 29 opens, the refrigerant gas in the closed container 1 is sucked and the refrigerant gas flowing into the cylinder 15 is increased. As a result, it is possible to improve the refrigeration capacity for high-speed operation.

[0054]

As described above, according to the first aspect of the present invention, there is provided a muffler, a partition plate for partitioning a space inside the muffler into an inside space and an outside space, and an inside and outside inside the muffler provided on the partition plate. An oil separation passage communicating with the space, a muffler inlet flow passage opening into the inner space divided by the muffler partition plate, and a muffler outlet flow passage communicating the inner space divided by the muffler partition plate with the cylinder. When the refrigerant gas flowing from the muffler inlet flow path to the inside of the muffler partition plate forms a flow along the partition plate, oil having a specific gravity greater than that of the refrigerant is subjected to centrifugal force and subjected to an oil separation passage. And is stored in the space outside the partition plate. On the other hand, the refrigerant having a low specific gravity forms a flow along the space inside the partition plate. as a result,
Oil separation is performed, and the amount of oil in the refrigerant gas flowing into the cylinder via the muffler outlet flow path is maintained properly, so that the performance is stable and high reliability is obtained. By sharing the passage as a space for attenuating the pressure pulsation generated by the refrigerant gas flowing into the muffler, noise can be reduced.

The invention described in claim 2 is the same as the claim 1.
In addition to the invention described in the above, the opening and closing valve that opens and closes the oil separation passage is provided, and when the amount of oil returned from the external cooling circuit during startup operation or the like is large, excess oil sucked into the muffler is large. When the momentum collides with the on-off valve, the on-off valve is pushed open and discharged to the space outside the partition plate. As a result, the amount of oil in the refrigerant gas flowing into the cylinder via the muffler outlet flow path is properly maintained, so that start-up failure is prevented and high reliability is obtained. When the amount of oil returned during stable operation is small, since the momentum of the lubricating oil colliding with the on-off valve is small, the on-off valve is in a state in which the oil separation passage is closed. As a result, the refrigerant gas flowing into the muffler is guided to the cylinder while maintaining a low temperature because the influence of the heat obtained from the inside of the closed vessel is reduced. As a result, it is possible to obtain a higher refrigerating capacity than a muffler without an on-off valve.

Further, the invention according to claim 3 comprises a muffler, a dividing valve for dividing the space inside the muffler into multiple chambers, and a temperature operating mechanism for adjusting the opening and closing of the dividing valve. During high ambient temperature operation when the temperature rises, the temperature operating mechanism operates the dividing valve to divide the muffler into multiple chambers, shorten the path that flows from the muffler inlet flow path to the muffler outlet flow path, and reduce the volume Suppresses the effect of heat received by the refrigerant gas from the muffler. As a result, a higher refrigerating capacity than a muffler that is not divided can be obtained.

Further, in the invention according to claim 4, the inverter device for operating the motor unit at at least two or more specific frequencies, and the auxiliary passage communicates the space in the muffler with the space in the closed container. Further, when the engine is operated at a high rotation speed, the flow rate of the refrigerant gas in the flow path before flowing into the muffler 27 is higher than that at the time of low rotation speed operation. As a result, a pressure drop occurs, but when the auxiliary passage opening / closing valve 29 is opened, the refrigerant gas in the closed casing 1 is sucked and the refrigerant gas flowing into the cylinder 15 is increased. As a result, it is possible to improve the refrigeration capacity for high-speed operation.

[Brief description of the drawings]

FIG. 1 is a front view of Embodiment 1 of a hermetic compressor according to the present invention.

FIG. 2 is a longitudinal sectional view of the hermetic compressor of the embodiment, taken along line AA in FIG. 1;

FIG. 3 is a vertical sectional view of the hermetic compressor of the embodiment taken along line BB in FIG. 2;

FIG. 4 is a detailed view of an oil separation passage of FIG. 3 of the hermetic compressor of the embodiment.

FIG. 5 is a vertical sectional view taken along line AA of FIG. 1 when the amount of oil of the hermetic compressor of the second embodiment is large.

FIG. 6 is a longitudinal sectional view taken along line AA of FIG. 1 when the amount of oil of the hermetic compressor of the embodiment is small.

FIG. 7 is a front view of Embodiment 3 of the hermetic compressor according to the present invention.

FIG. 8 is a vertical cross-sectional view of the hermetic compressor of the embodiment, taken along line CC in FIG. 7;

FIG. 9 is an essential part cross-sectional view of the muffler of the hermetic compressor of the embodiment at a low outside air temperature;

FIG. 10 is a cross-sectional view of a main part of the muffler of the hermetic compressor of the embodiment at the time of high outside temperature.

FIG. 11 is a front view of a fourth embodiment of the hermetic compressor according to the present invention.

FIG. 12 is a vertical sectional view of the hermetic compressor of the embodiment taken along line DD in FIG. 11;

FIG. 13 is a block diagram of Embodiment 4 of controlling a refrigeration apparatus including a hermetic compressor according to the present invention.

FIG. 14 is an essential part cross-sectional view of the muffler at a low rotation speed of the hermetic compressor of the embodiment.

FIG. 15 is a cross-sectional view of a main part of the muffler of the hermetic compressor of the embodiment at a high rotation speed.

FIG. 16 is a front view of a conventional hermetic compressor.

FIG. 17 is a longitudinal sectional view of the conventional hermetic compressor taken along line EE in FIG. 16;

FIG. 18 is a front view of a muffler 6 of the conventional hermetic compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Mechanical part 3 Motor part 14 Piston 15 Cylinder 16 Muffler 17 Partition plate 18a, 18b Oil separation passage 19 Muffler inlet flow path 20 Muffler outlet flow path 21a, 21b Open / close valve 22 Muffler 23 Split valve 24 Temperature operating mechanism 25 Motor Part 26 Inverter device 27 Muffler 28 Auxiliary passage 29 Auxiliary passage opening / closing valve

Claims (4)

[Claims] 1. A motor unit, a mechanical unit including a piston, a cylinder, etc., a sealed container containing the motor unit and the mechanical unit and storing oil, a muffler, and a space inside the muffler inside and outside. A partition plate for partitioning the muffler, an oil separation passage provided in the partition plate and communicating the inner and outer spaces in the muffler, and a muffler inlet flow opening to an inner space divided by the partition plate of the muffler. A hermetic compressor having a muffler outlet flow path that communicates a passage, an inner space divided by the partition plate of the muffler, and the cylinder. 2. The hermetic compressor according to claim 1, further comprising an on-off valve for opening and closing the oil separation passage. 3. A motor unit, a mechanical unit including a piston, a cylinder, and the like, a sealed container containing the motor unit and the mechanical unit and storing oil, a muffler, and a space inside the muffler divided into multiple chambers. And a temperature control mechanism for controlling the opening and closing of the split valve. 4. A motor unit, an inverter device for operating the motor unit, a mechanical unit including a piston, a cylinder, and the like; a sealed container housing the motor unit and the mechanical unit and storing oil; and a muffler. A hermetic compressor comprising: an auxiliary passage communicating the space in the muffler with the space in the closed container; and an auxiliary passage opening / closing valve for opening and closing the auxiliary passage.