JPH11107916A - Sealed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the noise leakage within an inlet passage and to reduce the attenuation of pressure wave or reflected wave by providing, on the curved part protruded downward of the inlet passage, a lubricating oil discharge passage having one end opened into the inlet passage and the other end opened in the same height as the opening end of the lubricating oil discharge passage within the internal space of a sealed vessel. SOLUTION: A lubricating oil passage 20 is provided in the curved part 19a protruded vertically downward of an inlet passage 19. The lubricating oil passage 20 has one end opened into the inlet passage 19 and the other end opened in the same height as the opening end of the inlet passage within the internal space of a sealed vessel 1. According re this structure, the pressure wave or reflected wave within the inlet passage 20 is prevented from leaking into the internal space of the sealed vessel 1 since a lubricating oil is consequently collected in the lubricating oil passage 20. Namely, the noise leakage within the inlet passage 20 can be prevented, and the attenuation of pressure amplitude of the pressure wave or reflected wave 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 There is a strong demand for improved hermetic performance of hermetic compressors used in refrigerators and the like.

For this reason, when the suction of the refrigerant gas into the cylinder is completed, the pressure in the cylinder is raised above the low pressure of the refrigeration cycle, and the density of the refrigerant gas sucked into the cylinder is increased. That is, there is a hermetic compressor as disclosed in Japanese Patent Application Laid-Open No. 6-50262 for improving the refrigeration capacity by supercharging.

Hereinafter, an example of a conventional hermetic compressor for improving the refrigeration capacity by supercharging will be described with reference to the drawings.

FIG. 13 is a longitudinal sectional view of a conventional hermetic compressor with improved refrigeration capacity, and FIG. 14 is a front view taken along line AA. FIG. 15 is a sectional view of an essential part taken along line BB of FIG. FIG. 16 is a cross-sectional view of the compression element in a suction start state, and FIG.
8 is a cross-sectional view during the suction operation of the compression element, and FIG. 19 is a cross-sectional view at the time of completion of the suction of the compression element.

13, 14 and 15, reference numeral 1 denotes a sealed container, 2 denotes an electric compression element, which is hermetically sealed by a coil spring 5 so that a mechanical part 3 is located at an upper part and a motor part 4 is located at a lower part. It is elastically supported by the container 1. The mechanical unit 3 includes a cylinder 7, a cylinder head 8, a piston 9, a crankshaft 10, a connecting rod 11, a bearing 12, and the like provided integrally with the block 6. The motor unit 4 includes a rotor 13 fixed to the crankshaft 10 and a stator 14, and the stator 14 is fixed to the block 6 by screws.
Reference numeral 15 denotes a lubricating oil, which is stored in a lower portion of the closed container 1. 1
Reference numeral 6 denotes a valve plate which has a suction hole 16a and is disposed on the end face of the cylinder 7. The suction hole 16a communicates with the inside of the cylinder 7. A suction lead 17 opens and closes the suction hole 16a. Reference numeral 18 denotes a suction channel, one end of which is open to the space in the closed container 1, and the other end of which is directly connected to the valve plate 16.

The operation of the hermetic compressor configured as described above will be described below. In FIG. 16, the flow of the refrigerant gas is stopped because the suction hole 16 a is blocked by the suction lead 17.

In FIG. 17, the piston 9 moves to the right, and the volume in the cylinder 7 increases rapidly. Therefore, a pressure difference is generated between the space inside the cylinder 7 and the space inside the closed container 1, and the refrigerant gas starts flowing rightward (inside the cylinder 7). At the same time, the pressure wave Wa is generated near the valve plate 16 due to the sudden increase in the volume in the cylinder 7.
Is generated, and the pressure wave propagates in the suction flow path 18 toward the space in the sealed container 1 in the direction opposite to the flow of the refrigerant gas through the suction hole 16a.

In FIG. 18, the pressure wave Wa that has reached the space inside the closed vessel 1 becomes a reflected wave Wb whose phase is inverted in the space inside the closed vessel 1 where the refrigerant gas is stagnated, and the refrigerant gas flows through the suction flow path 18 inside the suction flow path 18. Propagates in the same direction as the flow.

In FIG. 19, the reflected wave Wb whose phase is inverted in the space inside the closed container 1 propagates in the forward direction with the flow of the refrigerant gas and returns to the suction hole 16a again.

By making the time when the reflected wave Wb reaches the suction hole 16a coincide with the suction stroke, the pressure energy of the reflected wave Wb can be added at the time when suction is completed, so that the suction pressure increases.

Due to the supercharging effect, the cylinder 7 is filled with a refrigerant gas having a higher density, the amount of refrigerant discharged per compression stroke increases, the amount of circulating refrigerant increases, and the refrigerating capacity increases greatly. To improve.

[0013]

However, in the above-described conventional configuration, the structure of the suction flow path 18 has a plurality of bent portions because the long suction flow path 18 is provided in the limited closed container 1. Therefore, the mist-like lubricating oil in the sealed container 1 accumulates at the bent portion of the suction flow channel 18, the flow channel cross-sectional area of the suction flow channel 18 decreases, and the pressure amplitude of the pressure wave Wa and the reflected wave Wb decreases. , The supercharging effect is reduced. For this reason, the rise rate of the suction pressure was reduced, and there was a possibility that a high refrigeration capacity could not be obtained.

When a lubricating oil discharge hole is provided in the suction flow passage 18 so that lubricating oil does not accumulate in the suction flow passage 18, pressure waves Wa and reflected waves Wb leak from the lubricating oil discharge hole, and noise is generated. Also, there was a possibility that a high refrigerating capacity could not be obtained due to a decrease in the rate of increase in the suction pressure due to a decrease in the supercharging effect.

SUMMARY OF THE INVENTION The present invention solves the conventional problems and prevents noise from leaking in the suction passage and reduces the attenuation of the pressure amplitude of the pressure wave and the reflected wave, thereby stabilizing the noise without increasing the noise. It is an object of the present invention to provide a hermetic-type compressor in which a suction pressure is increased by a supercharging effect and a high refrigerating capacity is obtained.

Another object of the present invention is to prevent noise leakage in the suction passage, reduce noise generated from the opening end of the suction passage, and reduce attenuation of pressure amplitude of pressure waves and reflected waves. By doing so, it is possible to provide a hermetic-type compressor capable of obtaining a high refrigerating capacity by increasing the suction pressure with a low noise and a stable supercharging effect.

Further, in the above-mentioned conventional configuration, the suction pressure increases due to the supercharging effect from the time of initial startup of the hermetic compressor. For this reason, torque was insufficient, and there was a possibility of starting failure.

Another object of the present invention is to prevent a start-up failure by suppressing the supercharging effect at the time of initial startup and to prevent an increase in suction pressure, and to increase the suction pressure by the supercharging effect during normal operation to increase the refrigerating capacity. It is an object of the present invention to provide a hermetic compressor capable of obtaining the following.

In addition, the above-described conventional structure has a long suction passage 1.
8 is provided in the limited closed container 1,
Has a plurality of bends. Therefore, the pressure wave Wa
And the reflected wave Wb cause irregular reflection at the bent portion of the suction flow path 18, and the pressure amplitude of the pressure wave Wa and the reflected wave Wb decreases,
The supercharging effect decreases. For this reason, the rise rate of the suction pressure was reduced, and there was a possibility that a high refrigeration capacity could not be obtained.

Another object of the present invention is to provide a hermetic seal which increases the suction pressure by reducing the irregular reflection of pressure waves and reflected waves at the bent portion of the suction flow path and prevents a decrease in the supercharging effect, thereby obtaining a high refrigerating capacity. It is an object to provide a type compressor.

[0021]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a motor as a power source, mechanical parts such as a crankshaft, a piston and a cylinder driven by the motor, a motor and a machine. And a valve plate disposed on an end surface of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is an open end. The suction channel arranged in the closed container space, a bent portion that is vertically downwardly convex in the suction channel, and one end is opened in the suction channel vertically below the bent portion, and the other end is opened. In the closed container space, a lubricating oil discharge flow path is provided which has an open end at the same height as the open end in the suction flow path and which is convex downward in the vertical direction.

With this, it is possible to prevent noise leakage in the suction flow passage, reduce the attenuation of the pressure amplitude of the pressure wave and the reflected wave, and reduce the suction pressure by a stable supercharging effect without increasing noise. It can be raised to obtain high refrigeration capacity.

Further, according to the present invention, a motor part as a power source, mechanical parts such as a crankshaft, a piston and a cylinder driven by the motor part, a motor part and a mechanical part are housed, and lubricating oil is stored. A sealed container, a valve plate disposed on the end face of the cylinder and having a suction hole,
One end is substantially directly connected to the suction hole of the valve plate, and the other end is a suction channel arranged in the closed container space as an open end, and a bent portion that projects vertically downward in the suction channel,
One end is opened in the suction flow path vertically below the bent portion, and the other end is arranged vertically downward with the open end disposed vertically below the open end in the suction flow path in the closed container space. It is composed of a convex lubricating oil discharge channel.

This prevents noise leakage in the suction passage, reduces noise generated from the opening end of the suction passage, and reduces attenuation of the pressure amplitude of the pressure wave and the reflected wave, thereby achieving low noise. In addition, the suction pressure is increased by a stable supercharging effect, and a high refrigerating capacity can be obtained.

Further, according to the present invention, a motor section as a power source, a crankshaft driven by the motor section,
A hermetically sealed container containing a mechanical part such as a piston and a cylinder, a motor part and a mechanical part and storing lubricating oil, a valve plate disposed on an end surface of the cylinder and having a suction hole, and one end of the valve plate having a suction hole. And a suction flow path disposed at a position facing the lubricating oil surface in the space inside the sealed container as the open end at the other end.

With this, it is possible to prevent a start-up failure by suppressing the supercharging effect at the time of initial starting and to prevent an increase in suction pressure, and to obtain a high refrigeration capacity by increasing the suction pressure by the supercharging effect during normal operation. .

Further, according to the present invention, a motor unit as a power source, a crankshaft driven by the motor unit,
A hermetically sealed container containing a mechanical part such as a piston and a cylinder, a motor part and a mechanical part and storing lubricating oil, a valve plate disposed on an end surface of the cylinder and having a suction hole, and one end of the valve plate having a suction hole. The suction passage is substantially directly connected to the suction passage, and the other end thereof is formed as an open end in such a manner that the suction passage arranged in the space inside the closed container and the junction between the passages in the suction passage communicate at an inclination of approximately 135 degrees. And one or more bent portions.

[0028] Thereby, irregular reflection of pressure waves and reflected waves at the bent portion of the suction flow path is reduced, and a reduction in supercharging effect is prevented, thereby increasing suction pressure and obtaining high refrigerating capacity.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a motor unit as a power source, mechanical units such as a crankshaft, a piston, and a cylinder driven by the motor unit, a motor unit and a mechanical unit. And a sealed container storing lubricating oil, a valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end serving as an open end. A suction flow path arranged in the closed container space, a bent portion that projects vertically downward in the suction flow path, and one end opens into the suction flow path vertically below the bent portion and the other end is sealed. A lubricating oil discharge flow path that is convex in the vertical direction and has an opening end at the same height as the opening end in the suction flow path in the space inside the container, and the lubricating oil accumulated in the suction flow path Is discharged from the lubricating oil discharge passage into the closed container. That. In addition, since the lubricating oil accumulates in the lubricating oil discharge flow path, it is possible to prevent pressure waves and reflected waves in the suction flow path from leaking into the closed container space.

[0030] Thus, noise leakage in the suction flow path can be prevented, and the attenuation of the pressure amplitude of the pressure wave and the reflected wave can be reduced. Therefore, the suction pressure can be increased by a stable supercharging effect without increasing noise. It has the effect that a high refrigeration capacity improvement effect can be obtained.

According to a second aspect of the present invention, a motor unit serving as a power source, mechanical units such as a crankshaft, a piston, and a cylinder driven by the motor unit, and the motor unit and the mechanical unit are housed. And a valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is disposed in the closed container inner space as an open end. Suction channel, a bent portion that projects vertically downward in the suction channel, one end of which opens into the suction channel vertically below the bent portion, and the other end forms the suction channel in the closed container space. And a lubricating oil discharge flow path that is convex downward in the vertical direction in which the opening end is disposed vertically downward with respect to the opening end inside.
The lubricating oil accumulated in the suction flow path is discharged from the lubricating oil discharge flow path into the closed container.

Further, since the lubricating oil accumulates in the lubricating oil discharge passage, it is possible to prevent pressure waves and reflected waves in the suction passage from leaking into the space inside the closed container. As a result, the attenuation of the pressure amplitude of the pressure wave or the reflected wave can be reduced, so that the suction pressure is increased by the stable supercharging effect, and a high refrigerating capacity improvement effect can be obtained.

Furthermore, noise leakage in the suction passage can be prevented, and the space in the lubricating oil discharge passage becomes a side-branch type resonator, attenuating noise of an arbitrary frequency in the suction passage, and reducing the noise in the suction passage. This has the effect of reducing noise generated from the open end.

According to a third aspect of the present invention, there is provided a motor unit serving as a power source, mechanical units such as a crankshaft, a piston, and a cylinder driven by the motor unit, and a motor unit and a mechanical unit housed therein. And a valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end serving as an open end in the space inside the closed container. Before starting the initial operation, the pressure of the refrigeration system is high and a large amount of refrigerant gas is dissolved in the lubricating oil, and the oil level of the lubricating oil is high. The opening end of the passage is close to the oil surface, and the volume of space near the opening end of the suction passage is reduced.

As a result, at the time of initial startup, the pressure wave generated in the vicinity of the valve plate cannot be reflected well at the opening end of the suction passage, and the rise rate of the suction pressure due to the reflected wave is greatly reduced. Can also be reduced.

Also, during normal operation, the amount of refrigerant gas dissolved in the lubricating oil is small, the oil level is lower than at the time of initial startup, and a sufficient space volume near the opening end of the suction passage can be secured. Thus, during normal operation, a supercharging effect can be obtained from the start.

Therefore, at the time of initial startup, the effect of suppressing the supercharging effect is to prevent the torque shortage and to prevent the starting failure, and at the time of the normal operation, the suction pressure is increased by the supercharging effect to obtain a high refrigerating capacity.

According to a fourth aspect of the present invention, there is provided a motor unit serving as a power source, mechanical units such as a crankshaft, a piston and a cylinder driven by the motor unit, and a motor unit and a mechanical unit housed therein. And a valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is disposed in the closed container inner space as an open end. Pressure, which has reached the wall surface of the suction flow channel bent portion, which is formed by the suction flow channel and one or more bent portions formed so that the junction between the flow channels in the suction flow channel communicates at an inclination of approximately 135 degrees. Since the waves and the reflected waves are reflected at an angle of approximately 45 degrees with respect to the incident angle, the distortion of the pressure waves and the reflected waves after the wall reflection can be reduced.

Therefore, the pressure wave and the reflected wave can propagate without being attenuated even in the bent portion of the suction passage, a high supercharging effect can be obtained, and a high refrigerating capacity can be obtained by increasing the suction pressure. It has the action of:

[0040]

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 cross-sectional view of the hermetic compressor of FIG. Indicates that
FIG. 3 is a sectional view of a main part of the suction flow channel of the embodiment.

In FIGS. 1, 2 and 3, reference numeral 16 denotes a valve plate disposed on the end face of the cylinder 7 and having a suction hole 16a. One end 19 is substantially directly connected to the suction hole 16a of the valve plate 16. The other end is a suction pipe as a suction flow path arranged in the space inside the closed container 1 as an open end. Reference numeral 19a denotes a bent portion of the suction pipe 19 which projects downward in the vertical direction, and reference numeral 20 denotes one end of the suction pipe 19 which is opened vertically below the bent portion 19a in the suction pipe 19, and the other end of which is formed in the space inside the closed container 1. 19 is a lubricating oil discharge flow path composed of a U-shaped tube having a vertically downwardly projecting U-shaped tube, the opening end of which is arranged at the same height as the opening end of the inside 19.

The operation of the hermetic compressor configured as described above will be described below. The pressure wave generated in the vicinity of the valve plate 16 during the suction stroke propagates in the direction opposite to the flow of the refrigerant gas, becomes a reflected wave whose phase is inverted in the space inside the closed container 1, propagates in the forward direction with the flow of the refrigerant gas, and sucks again. It returns to the hole 16a.

During the suction stroke, this reflected wave is
When the pressure reaches a, the pressure energy of the reflected wave is added at the time of completion of the suction, and the suction pressure increases.

For this reason, by filling the cylinder 7 with a refrigerant gas having a higher density, the amount of refrigerant discharged per compression stroke is increased, the amount of circulated refrigerant is increased, and the refrigerating capacity can be improved.

Further, since the lubricating oil 15 accumulated in the bent portion 19a of the suction pipe 19 can be discharged into the closed container 1 by the U-shaped tube 20, the pipe cross-sectional area of the suction pipe 19 can be prevented from decreasing. As a result, it is possible to prevent the pressure amplitude of the pressure wave or the reflected wave from attenuating, and to obtain a stable supercharging effect.

Further, the lubricating oil discharge passage 20
5, the pressure wave and the reflected wave in the suction pipe 19 are prevented from leaking into the space inside the closed container 1,
Noise leakage can be prevented, and a decrease in pressure energy of pressure waves and reflected waves can be reduced.

Therefore, by obtaining a stable supercharging effect without increasing noise, the suction pressure is increased and a high refrigerating capacity is obtained.

As described above, the hermetic compressor of this embodiment is
A valve plate 16 having an intake hole 16a disposed on an end surface of the cylinder 7 and one end substantially directly connected to the intake hole 16a of the valve plate 16, and the other end disposed in the space inside the closed container 1 as an open end. A suction pipe 19, and a bent portion 19a which is formed to project vertically downward in the suction pipe 19;
And one end of the suction pipe 1 is vertically below the bent portion 19a.
9 and the other end of the suction pipe 1
9 has a U-shaped tube 20 which is vertically convex downwardly and has an open end at the same height as the open end of the inside of the closed container 1 without lubricating oil 15 accumulating in the suction pipe 19. It is possible to prevent the noise leak in the suction pipe 19 by preventing the pressure wave and the reflected wave in the suction pipe 19 from leaking into the space inside the sealed container 1 while preventing the noise leak in the suction pipe 19.
Since the attenuation of the pressure amplitude of the pressure wave or the reflected wave can be reduced, the suction pressure can be increased by a stable supercharging effect without increasing the noise, and a high refrigerating capacity can be obtained.

In this embodiment, the suction pipe 1
9 is almost directly connected to the suction hole 16a of the valve plate 16, but even if it is connected via a small space, substantially the same effect can be obtained.

In the present embodiment, the suction passage is the suction pipe 19. However, instead of the pipe, for example, a passage provided in a mechanical section or a muffler-shaped passage may be used. Similar effects can be obtained.

Further, in this embodiment, the lubricating oil discharge passage is the U-shaped tube 20, but the same effect can be obtained as long as the inside of the suction pipe 19 and the space in the closed container are not directly communicated. Can be.

(Embodiment 2) FIG. 4 is a front view of a hermetic compressor according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of the hermetic compressor of FIG. Indicates that
FIG. 6 is a cross-sectional view of a main part of the suction passage of the embodiment.

4, 5, and 6, reference numeral 16 denotes a valve plate disposed on the end face of the cylinder 7 and having a suction hole 16a. One end 21 is substantially directly connected to the suction hole 16a of the valve plate 16. The other end is a suction pipe as a suction flow path arranged in the space inside the closed container 1 as an open end. Reference numeral 21a denotes a bent portion of the suction pipe 21 which projects downward in the vertical direction. Reference numeral 22 denotes one end of the suction pipe 21 which opens into the suction pipe 21 below the bent portion 21a in the vertical direction, and the other end of which is formed in the space inside the sealed container 1. A J-shaped tube as a lubricating oil discharge flow path that is vertically downwardly convex with the opening end disposed vertically below the opening end inside 21.

The operation of the hermetic compressor configured as described above will be described below. The pressure wave generated in the vicinity of the valve plate 16 during the suction stroke propagates in the direction opposite to the flow of the refrigerant gas, becomes a reflected wave whose phase is inverted in the space inside the closed container 1, propagates in the forward direction with the flow of the refrigerant gas, and sucks again. It returns to the hole 16a.

During the suction stroke, this reflected wave is
When the pressure reaches a, the pressure energy of the reflected wave is added at the time of completion of the suction, and the suction pressure increases.

Therefore, by filling the cylinder 7 with a refrigerant gas having a higher density, the amount of refrigerant discharged per compression stroke increases, the amount of refrigerant circulation increases, and the refrigerating capacity can be greatly improved. it can.

Further, since the lubricating oil 15 accumulated in the bent portion 21a of the suction pipe 21 can be discharged into the closed container 1 by the J-shaped tube 22, the pipe cross-sectional area of the suction pipe 21 can be prevented from decreasing. As a result, it is possible to prevent the pressure amplitude of the pressure wave or the reflected wave from attenuating, and to obtain a stable supercharging effect.

Further, lubricating oil 1 is contained in the J-shaped tube 22.
5, the pressure wave and the reflected wave in the suction pipe 21 are prevented from leaking into the space inside the sealed container 1,
Noise leakage can be prevented, and a decrease in pressure energy of pressure waves and reflected waves can be reduced.

In addition, the space inside the J-shaped tube 22 becomes a side branch type resonator, and the noise to be reduced can be adjusted to an arbitrary frequency in the suction pipe 21 by adjusting the inner diameter and space length of the J-shaped tube. Attenuate noise, suction pipe 2
1 can reduce noise generated from the opening end.

Therefore, the suction pressure is increased by obtaining a stable supercharging effect with low noise, and a high refrigerating capacity can be obtained.

As described above, the hermetic compressor of this embodiment is
A valve plate 16 having an intake hole 16a disposed on an end surface of the cylinder 7 and one end substantially directly connected to the intake hole 16a of the valve plate 16, and the other end disposed in the space inside the closed container 1 as an open end. A suction pipe 21 and a bent portion 21a that is convex downward in the vertical direction in the suction pipe 21
And one end of the suction pipe 2 is vertically below the bent portion 21a.
1 and the other end is a suction pipe 2
1 has a vertically downwardly projecting J-shaped tube 22 having an opening end disposed vertically below the opening end of the inside 1, so that the lubricating oil 15 does not accumulate in the suction pipe 21. It is possible to discharge the pressure wave and the reflected wave in the suction pipe 21 to the space inside the closed container 1 while discharging the gas into the closed container 1.

As a result, the attenuation of the pressure amplitude of the pressure wave or the reflected wave can be reduced, so that the suction pressure can be increased by a stable supercharging effect and a high refrigerating capacity can be obtained.

Further, noise leakage in the suction pipe 21 can be prevented, and the space inside the J-shaped tube 22 becomes a side branch type resonator, which attenuates an arbitrary frequency in the suction pipe 21 and opens the suction pipe 21. Noise generated from the end can be reduced.

In this embodiment, the suction pipe 2
1 is almost directly connected to the suction hole 16a of the valve plate 16, but even if it is connected via a small space, substantially the same effect can be obtained.

In the present embodiment, the suction flow path is the suction pipe 21. Instead of the pipe, for example, a flow path provided in a mechanical section or a flow path provided in a muffler shape may be used. Similar effects can be obtained.

In this embodiment, the J-shaped tube 22 is used. However, the same effect can be obtained if the inside of the suction pipe 21 and the space in the closed container are not directly communicated with each other and there is a space in the communication passage portion. Can be.

(Embodiment 3) FIG. 7 is a front view of a hermetic compressor before the initial start according to a third embodiment of the present invention, and FIG. 8 is an EE diagram of the hermetic compressor of FIG. FIG. 9 shows a front view of the hermetic compressor after the initial start-up of the embodiment.

7, 8, and 9, reference numeral 16 denotes a valve plate disposed on the end face of the cylinder 7 and having a suction hole 16a, and 23 has one end substantially directly connected to the suction hole 16a of the valve plate 16. And a suction pipe serving as a suction flow path, the other end of which is disposed as an open end at a position facing the surface of the lubricating oil 15 in the space inside the closed container 1.

The operation of the hermetic compressor constructed as described above will be described below. Before the initial start-up, since the pressure of the refrigeration system is high and a large amount of refrigerant gas is dissolved in the lubricating oil 15 and the oil level of the lubricating oil 15 is high, the opening end of the suction pipe 23 is close to the oil level, and the opening of the suction pipe 23 is opened. The volume of space near the edge decreases.

As a result, the pressure wave generated in the vicinity of the valve plate 16 cannot be reflected well at the opening end of the suction pipe 23 at the time of the initial startup, and the rise rate of the suction pressure due to the reflected wave is greatly reduced. The starting torque can also be reduced.

Further, during normal operation, the amount of refrigerant gas dissolved in the lubricating oil 15 is small, so that the oil level is lower than at the time of initial startup, and a sufficient space volume near the opening end of the suction pipe 23 can be secured.

During normal operation, the pressure wave generated in the vicinity of the valve plate 16 during the suction stroke propagates in the direction opposite to the flow of the refrigerant gas, and becomes a reflected wave whose phase has been inverted in the space inside the closed casing 1, and becomes a reflected wave. It propagates in the forward direction with the flow and returns to the suction hole 16a again.

During the suction stroke, this reflected wave is
When the pressure reaches a, the pressure energy of the reflected wave is added at the time of completion of the suction, and the suction pressure increases.

Therefore, by filling the cylinder 7 with a refrigerant gas having a higher density, the amount of refrigerant discharged per compression stroke increases, the amount of circulating refrigerant increases, and the refrigerating capacity can be greatly improved. it can.

Therefore, at the time of initial startup, by suppressing the supercharging effect, it is possible to prevent torque shortage and prevent starting failure, and at the time of normal operation, it is possible to obtain a high refrigerating capacity by increasing the suction pressure by the supercharging effect.

As described above, the hermetic compressor of this embodiment is
A valve plate 16 disposed on an end surface of the cylinder 7 and having a suction hole 16a; one end substantially connected directly to the suction hole 16a of the valve plate 16; Before the initial start-up, in which the refrigerant gas is dissolved in the lubricating oil 15 and the oil level of the lubricating oil 15 is high, the opening end of the suction pipe 23 has an oil level. , And the volume of space near the opening end of the suction pipe 23 decreases. This allows the valve plate 16
Since the pressure wave generated in the vicinity cannot be reflected well at the opening end of the suction pipe 23 and the rise rate of the suction pressure due to the reflected wave is greatly reduced, the refrigeration capacity is reduced and the starting torque can be reduced.

Further, during normal operation, the amount of refrigerant gas dissolved in the lubricating oil 15 is small, so that the oil level is lower than at the time of initial startup, and a sufficient space volume near the opening end of the suction pipe 23 can be secured. As a result, during normal operation, a supercharging effect is obtained from the start, and a high refrigerating capacity can be obtained by increasing the suction pressure.

Therefore, at the time of the initial start-up, the supercharging effect is suppressed and the rise of the suction pressure is prevented, thereby preventing the start-up failure. At the time of normal operation, the suction pressure is raised by the supercharge effect to obtain a high refrigerating capacity. .

In this embodiment, the suction pipe 2
3 is almost directly connected to the suction hole 16a of the valve plate 16, but even if it is connected via a small space, almost the same effect can be obtained.

In the present embodiment, the suction flow path is the suction pipe 23. Instead of the pipe, for example, a flow path provided in a mechanical section or a flow path provided in a muffler shape may be used. Similar effects can be obtained.

(Embodiment 4) FIG. 10 is a front view of a hermetic compressor according to a fourth embodiment of the present invention, and FIG. 11 is a cross-sectional view of the hermetic compressor of FIG. FIG. 12 is a sectional view of a main part of the suction flow channel of the embodiment.

In FIGS. 10, 11 and 12, reference numeral 16 denotes a valve plate disposed on the end face of the cylinder 7 and having a suction hole 16a.
6 is a suction pipe which is substantially directly connected to the suction hole 16a, the other end of which is disposed as an open end in the space inside the closed container 1 as a suction flow passage. One or more bends formed to communicate with each other at an inclination of approximately 135 degrees.

The operation of the hermetic compressor configured as described above will be described below. The pressure wave generated in the vicinity of the valve plate 16 during the suction stroke propagates in the direction opposite to the flow of the refrigerant gas, becomes a reflected wave whose phase is inverted in the space inside the closed container 1, propagates in the forward direction with the flow of the refrigerant gas, and sucks again. It returns to the hole 16a.

At this time, the bent portion 24a of the suction pipe 24
Since the pressure wave and the reflected wave reaching the wall surface are reflected at an angle of about 45 degrees with respect to the incident angle, the distortion of the pressure wave and the reflected wave after the wall surface reflection can be reduced.

During the suction stroke, this reflected wave is
When the pressure reaches a, the pressure energy of the reflected wave is added at the time of completion of the suction, and the suction pressure increases.

Therefore, by filling the cylinder 7 with a refrigerant gas having a higher density, the amount of refrigerant discharged per compression stroke increases, the amount of circulating refrigerant increases, and the refrigerating capacity can be greatly improved. it can.

At this time, the bent portion 24a of the suction pipe 24
Since the pressure wave and the reflected wave reaching the wall surface are reflected at an angle of about 45 degrees with respect to the incident angle, the distortion of the pressure wave and the reflected wave after the wall surface reflection can be reduced.

Accordingly, the pressure wave and the reflected wave can be propagated without being attenuated even at the bent portion 24a of the suction pipe 24. During the suction process, the reflected wave is generated by the suction hole 16a.
By reaching a, the pressure energy of the reflected wave is added at the time of completion of the suction, and the suction pressure can be increased.

Therefore, by filling the cylinder 7 with a refrigerant gas having a higher density, the amount of refrigerant discharged per compression stroke increases, the amount of refrigerant circulation increases, and the refrigerating capacity can be greatly improved. it can.

As described above, the hermetic compressor of this embodiment is
A valve plate 16 having an intake hole 16a disposed on an end surface of the cylinder 7 and one end substantially directly connected to the intake hole 16a of the valve plate 16, and the other end disposed in the space inside the closed container 1 as an open end. The suction pipe 24 includes one or more bent portions 24a formed so that the joint between the flow paths communicates with the suction pipe 24 at an inclination of approximately 135 degrees. The arriving pressure wave or reflected wave is reflected at an angle of approximately 45 degrees with respect to the incident angle, so that distortion of the pressure wave or the reflected wave after the wall reflection can be reduced.

Accordingly, even at the bent portion 24a of the suction pipe 24, the pressure wave and the reflected wave can propagate without being attenuated, a high supercharging effect can be obtained, and a high refrigerating capacity can be obtained by increasing the suction pressure. be able to.

In this embodiment, the suction pipe 2
4 is almost directly connected to the suction hole 16a of the valve plate 16, but even if it is connected via a small space, substantially the same effect can be obtained.

In the present embodiment, the suction flow passage is the suction pipe 24. Instead of the pipe, for example, a flow passage provided in a mechanical section or a muffler-shaped flow passage may be used. Similar effects can be obtained.

[0095]

As described above, the first aspect of the present invention provides a motor as a power source, mechanical parts such as a crankshaft, a piston and a cylinder driven by the motor, a motor and a mechanical part. And a sealed container storing lubricating oil, a valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end serving as an open end. A suction flow path arranged in the closed container space, a bent portion that projects vertically downward in the suction flow path, and one end opens into the suction flow path vertically below the bent portion and the other end is sealed. Prevents noise leakage in the suction flow path because it consists of an opening end in the suction flow path and an opening end at the same height as the lubricating oil discharge flow path that is convex downward in the container space. As well as pressure and reflected wave pressure Can attenuation can be reduced, to obtain a high refrigerating capacity to increase the suction pressure by stable supercharging effect without increasing noise.

Further, the invention according to claim 2 houses a motor unit as a power source, mechanical units such as a crankshaft, a piston and a cylinder driven by the motor unit, and a motor unit and a mechanical unit. A sealed container storing the lubricating oil, a valve plate disposed on an end face of the cylinder and having a suction hole, and one end substantially connected directly to the suction hole of the valve plate, and the other end as an open end in the space inside the sealed container. The arranged suction flow path, a bent portion that projects vertically downward in the suction flow path, and one end that opens into the suction flow path vertically below the bent portion, and the other end sucks in the closed container space. The lubricating oil discharge flow path has a vertically downwardly convex lubricating oil discharge path in which an opening end is disposed vertically below the open end in the flow path, so that lubricating oil does not accumulate in the suction flow path. Can be discharged into a sealed container The pressure wave and the reflected wave in the suction passage can be prevented leakage into the sealed container space. This allows
Since the attenuation of the pressure amplitude of the pressure wave or the reflected wave can be reduced, the suction pressure can be increased by a stable supercharging effect, and a high refrigerating capacity can be obtained.

Further, noise leakage in the suction flow passage can be prevented, and the space in the lubricating oil discharge flow passage becomes a side branch type resonator to attenuate noise of an arbitrary frequency in the suction flow passage, thereby reducing the noise in the suction flow passage. Noise generated from the open end can be reduced.

According to a third aspect of the present invention, there is provided a motor unit serving as a power source, a mechanical unit such as a crankshaft, a piston and a cylinder driven by the motor unit, and a motor unit and a mechanical unit. A sealed container storing lubricating oil, a valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end serving as an open end in the space inside the closed container. Since it is composed of a lubricating oil surface and a suction flow path arranged at a position facing the lubricating oil surface, it suppresses the supercharging effect at the time of initial startup and prevents a rise in suction pressure, thereby preventing poor startup and
During normal operation, the suction pressure is increased by the supercharging effect, and a high refrigeration capacity can be obtained.

According to a fourth aspect of the present invention, there is provided a motor unit as a power source, a mechanical unit such as a crankshaft, a piston, and a cylinder driven by the motor unit, and a motor unit and a mechanical unit. A sealed container storing the lubricating oil, a valve plate disposed on an end face of the cylinder and having a suction hole, and one end substantially connected directly to the suction hole of the valve plate, and the other end as an open end in the space inside the sealed container. The arranged suction channel and the junction between the channels in the suction channel are almost 1
Since it is composed of at least one bent portion formed so as to communicate with an inclination of 35 degrees, the pressure wave or the reflected wave reaching the wall surface of the bent portion of the suction passage is approximately 45 degrees with respect to the incident angle. , The distortion of the pressure wave and the reflected wave after the reflection on the wall surface can be reduced.

Therefore, the pressure wave and the reflected wave can propagate without being attenuated even in the bent portion of the suction flow path, and a high supercharging effect can be obtained. Can be.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the hermetic compressor of FIG.

FIG. 3 is a cross-sectional view of a main part of the suction channel according to the embodiment.

FIG. 4 is a front view of a hermetic compressor according to a second embodiment of the present invention.

FIG. 5 is a sectional view of the hermetic compressor of FIG. 4 of the embodiment taken along line CC.

FIG. 6 is a sectional view of a main part of the suction channel of the embodiment.

FIG. 7 is a front view of a hermetic compressor before initial startup according to a third embodiment of the present invention.

8 is a cross-sectional view of the hermetic compressor of FIG. 7 of the embodiment taken along line EE.

FIG. 9 is a front view of the hermetic compressor after the initial start-up of the embodiment.

FIG. 10 is a front view of a hermetic compressor according to a fourth embodiment of the present invention.

FIG. 11 is a cross-sectional view of the hermetic compressor of FIG.
Sectional view at line F

FIG. 12 is a cross-sectional view of a main part of the suction channel of the embodiment.

FIG. 13 is a longitudinal sectional view of a conventional hermetic compressor with improved refrigeration capacity.

14 is a front view of the conventional hermetic compressor of FIG. 13 taken along line AA.

15 is a cross-sectional view of a main part of the conventional hermetic compressor of FIG. 14 taken along line BB.

FIG. 16 is a cross-sectional view of the compression element in a suction start state.

FIG. 17 is a sectional view of an initial stage of a suction operation of a compression element.

FIG. 18 is a cross-sectional view during a suction operation of the compression element.

FIG. 19 is a sectional view at the time of completion of suction of the compression element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 3 Mechanical part 4 Motor part 7 Cylinder 9 Piston 10 Crankshaft 15 Lubricating oil 16 Valve plate 16a Suction hole 19 Suction pipe 19a Bending part 20 Lubricating oil discharge flow path 21 Suction pipe 21a Bending part 22 J-shaped tube 23 Suction Pipe 24 Intake pipe 24a Bend

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shuhei Sugimoto 4-5-2-5 Takaida Hondori, Higashiosaka-shi, Osaka Matsushita Refrigerator Co., Ltd.

Claims (4)

[Claims] An airtight container containing a motor unit serving as a power source, a mechanical unit such as a crankshaft, a piston, and a cylinder driven by the motor unit, and containing the motor unit and the mechanical unit and storing lubricating oil. A valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is disposed in the closed container space as an open end. A suction channel, a bent portion that is vertically downwardly convex in the suction channel, and one end opens into the suction channel at a vertically lower side of the bent portion, and the other end is in the closed container space. A hermetic compressor comprising a lubricating oil discharge flow path having a vertically downwardly convex lubricating oil discharge flow path having an open end at the same height as an open end in the suction flow path. 2. A hermetic container containing a motor section as a power source, a mechanical section such as a crankshaft, a piston and a cylinder driven by the motor section, and containing the motor section and the mechanical section and storing lubricating oil. A valve plate disposed on an end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is disposed in the closed container space as an open end. A suction flow path, a bent portion that is vertically downwardly convex in the suction flow path, and one end opens into the suction flow path vertically below the bent portion in the suction flow path, and the other end is formed in the closed container space. A hermetic compressor including a lubricating oil discharge flow path that is vertically downwardly convex and has an opening end vertically lower than an opening end in the suction flow path. 3. A hermetic container containing a motor section as a power source, a mechanical section such as a crankshaft, a piston, and a cylinder driven by the motor section, and the lubricating oil containing the motor section and the mechanical section. A valve plate disposed on an end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is an open end in the space inside the closed container. A hermetic compressor comprising a suction passage arranged at a position facing the surface. 4. A hermetic container containing a motor section as a power source, a mechanical section such as a crankshaft, a piston and a cylinder driven by the motor section, and containing the motor section and the mechanical section and storing lubricating oil. A valve plate disposed on the end face of the cylinder and having a suction hole, one end of which is substantially directly connected to the suction hole of the valve plate, and the other end of which is disposed in the closed container space as an open end. The suction flow path and the junction between the flow paths in the suction flow path are substantially 1
A hermetic compressor comprising one or more bent portions formed so as to communicate with each other at an inclination of 35 degrees.