JP2002130129A - Closed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the efficiency of feeding oil to the piston and cylinder portions of a closed compressor, while preventing an increase of noises and enhancing the efficiency and reliability of the compressor, by stabilizing the amount of oil fed, irrespective of changes in operating condition and volume of a cylinder, etc. SOLUTION: The closed compressor includes an oil reservoir portion 30 provided in the upper surface of a cylinder 6, and an oil capillary 31 open at one end to the oil reservoir portion 30 and open at the other end to the inside of an intake flow passage 23, so that even if the operating frequency or the intake pressure of the compressor is reduced or if the compressor is used with a low cylinder volume, oil can be stably fed because of low head height H, while assuring the amount of oil fed from the capillary 31. The closed compressor of high reliability can thus be obtained while stabilizing its efficiency and preventing an increases of noises.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art High efficiency and low noise are strongly demanded for hermetic compressors used in refrigeration equipment and the like, and maintenance and repair inside hermetic containers cannot be performed. I have. Above all, the sliding part between the piston and cylinder of the reciprocating compressor receives a large surface pressure due to compression and is in a severe sliding state, and the oil sealing of the sliding part affects the leakage of compressed gas. Efficiency is affected, and noise may be generated when each component collides.

[0003] Therefore, lubrication is performed to a sliding portion between a piston and a cylinder, a valve, and the like to improve reliability and efficiency.
In addition, methods for reducing noise have been conventionally devised. As a method of refueling a cylinder, a valve or the like, there is a method disclosed in Japanese Utility Model Publication No. 4-33428, for example.

Hereinafter, an example of the above-described conventional hermetic compressor will be described with reference to the drawings.

FIG. 9 is a front sectional view showing a conventional hermetic compressor, FIG. 10 is a side sectional view taken along the line AA of FIG. 9, and FIG. 11 is a sectional view of a main part of FIG.

9, 10, and 11, reference numeral 1 denotes a sealed container, 2 denotes a mechanical unit, 3 denotes a motor unit, and the mechanical unit 2 and the motor unit 3 are integrally formed by a coil spring 4 with a closed container 1. Supported within. The mechanical unit 2 includes a cylinder 6, a cylinder head 7, a piston 8, a crankshaft 9, a connecting rod 10, a bearing 11, and the like provided integrally with the block 5. The motor unit 3 includes a rotor 12 fixed to the crankshaft 9 and a stator 13, and the stator 13 is fixed to the block 5 by screws. 14 is a suction chamber provided in the cylinder head 7, 15 is a valve plate, 1
Reference numeral 6 denotes a suction hole provided in the valve plate 15, and reference numeral 17 denotes a suction valve for opening and closing the suction hole 16. 18 is a suction pipe, 1
Reference numeral 9 denotes an insertion tube, and reference numeral 20 denotes a close contact coil spring that connects the suction tube 18 and the insertion tube 19. Reference numeral 21 denotes a suction muffler into which an insertion tube 19 is inserted.

A suction pipe 22 has one end opening into the suction muffler 21 and the other end opening into the suction chamber 14 in the cylinder head 7. Reference numeral 23 denotes a suction flow path, which is a generic name of a passage through which the refrigerant gas in the suction pipe 22 and the suction chamber 14 is sucked into the cylinder 6. Reference numeral 24 denotes oil stored at the bottom of the sealed container 1, 25 denotes an oil capillary having one end opened into the oil 24 and the other end opened into the suction pipe 22, 26 a steel strip having spring properties, and 27 a fixing bolt. is there. The oil capillary 25 is connected to the suction pipe 22 and the cylinder head 7 by a steel strip 26 and a fixing bolt 27.
It is fixed to. H is a lift height represented by a vertically upward distance from an upper surface of the oil 24 to an insertion portion of the oil capillary 25 into the suction pipe 22. Reference numeral 28 denotes an oil supply pipe fixed to the lower end of the crankshaft 9 and communicates with an oil supply hole 29 in the crankshaft 9.

The operation of the hermetic compressor constructed as described above will be described below.

The motor section 3 drives the crankshaft 9, connecting rod 10, piston 8, etc. of the mechanical section 2, and from an external cooling circuit (not shown) through a suction pipe 18, a close contact coil spring 20, and an insertion pipe 19, a suction muffler. Refrigerant gas is sucked into 21. This refrigerant gas is supplied to the suction pipe 2
After passing through the suction chamber 16 in the cylinder head 7, the air is intermittently sucked into the cylinder 6 through the suction hole 16 in response to opening and closing of the suction valve 17. The sucked refrigerant gas is compressed by the piston 8 in the cylinder 6, and is discharged from the cylinder 6 by opening a discharge valve (not shown).

In these operations, the refrigerant gas flows through the suction pipe 22 so that the oil capillary 25
, A pressure difference is generated between both ends. This pressure difference serves as a driving force, and the oil 24 accumulated at the bottom of the sealed container 1 is sucked up through the oil capillary 25, and becomes mist-like oil 24 together with the refrigerant gas flowing through the suction pipe 22, and the suction valve 17. Lubricate the piston 8, cylinder 6, etc.

The oil supply by the oil capillary 25 improves the sealing performance between the suction hole 16 and the suction valve 17 and the discharge hole (not shown) and the discharge valve (not shown), and lubricates the piston 8 and the cylinder 6. By improving the sliding, the efficiency and reliability can be improved, and furthermore, the noise generated when each component collides can be reduced.

Oil is supplied by the oil capillary 25 only when the pressure difference generated between both ends of the oil capillary 25 is larger than the pressure due to the weight of the oil 24 corresponding to the head height H.

The pressure difference between both ends of the oil capillary 25 is mainly caused by the pressure loss due to the pipe friction in the suction muffler 21 and the dynamic pressure drop due to the flow, and the sum of them becomes the total pressure difference. . The former pressure loss due to tube friction is proportional to the square of the density and velocity of the refrigerant gas from the theory of fluid dynamics. On the other hand, the dynamic pressure drop due to the latter flow is proportional to the square of the density and velocity of the refrigerant gas from the theory of fluid dynamics. This dynamic pressure drop is based on the principle that, according to Bernoulli's theorem, which is the law of conservation of fluid energy, the pressure (static pressure) decreases as the velocity energy (dynamic pressure) increases. That is, as the density and speed of the refrigerant gas flowing near the opening of the oil capillary 25 increase, the pressure difference between both ends of the oil capillary 25 increases.

Therefore, the amount of oil supplied by the oil capillary 25 increases as the density and speed of the refrigerant gas flowing near the opening of the oil capillary 25 increase, and the head height H
Increases as the value decreases.

When the crankshaft 9 rotates, the oil 24 is sucked up from the oil supply pipe 28 by centrifugal force, and lubricates the sliding portion between the crankshaft 9 and the bearing 11 through the oil supply hole 29. Then oil 2
4 flows out from the upper end of the bearing 11, flows on the upper surface of the cylinder 6 and the block 5, and returns to the bottom of the closed container 1 again.

[0016]

However, in the above-described conventional configuration, the operation frequency is reduced by converting the hermetic compressor into an inverter, the suction pressure is reduced due to a change in the outside air temperature, or the like. When used in a cylinder capacity, the density and speed of the intake gas decrease, the pressure difference between both ends of the oil capillary 25 decreases, and the amount of oil supplied from the oil capillary 25 decreases. In some cases, the pressure difference between both ends of the oil capillary 25 becomes smaller than the pressure due to the weight of the oil 24 corresponding to the head height H, and it becomes difficult to supply oil. For this reason, there have been drawbacks that the reliability and efficiency are reduced due to the deterioration of the lubrication state and the sealing performance, and that noise when each component collides may increase.

SUMMARY OF THE INVENTION The present invention solves the conventional problems. Even when the operating frequency of a hermetic compressor is reduced, the suction pressure is reduced, or the compressor is used with a low cylinder capacity, the amount of oil supplied from the oil capillary is reduced. It is an object of the present invention to provide a reliable hermetic compressor capable of ensuring stable and stable refueling, stabilizing efficiency, preventing an increase in noise, and having high reliability.

In addition, the above-described conventional configuration has a disadvantage that the oil capillary 25, the steel strip 26, and the fixing bolt 27 are required for oil supply, and the cost of these parts and the cost of assembly are high.

Another object of the present invention is to secure a more stable lubrication than before without using an oil capillary, thereby stabilizing efficiency, preventing an increase in noise, improving reliability, and reducing the number of parts. It is an object of the present invention to provide a hermetic compressor that is small and inexpensive.

Another object of the present invention is to use an oil capillary without using an oil capillary, and without processing a component.
The aim is to secure a more stable lubrication than before, stabilize efficiency, prevent an increase in noise, achieve high reliability, reduce the number of parts and processing steps, and reduce the cost of hermetic compressors. I do.

In the above-described conventional configuration, the oil capillary 25 is in contact with the high-temperature cylinder head 7 at a relatively long distance.
It receives heat while flowing inside and becomes hot. When the high-temperature oil 24 flows into the suction pipe 22, the low-temperature refrigerant gas in the suction pipe 22 receives heat and its temperature rises. Therefore, there is a drawback that the density of the refrigerant gas sucked into the cylinder 6 becomes small, the amount of circulating refrigerant becomes small, and the efficiency may be reduced.

Another object of the present invention is to supply oil directly into the compression chamber using gravity, thereby ensuring a stable oil supply amount irrespective of conditions such as operating frequency, suction pressure and low cylinder volume. A compressor that stabilizes the compressor, prevents noise from increasing, increases reliability, and prevents the refrigerant gas from being received by the oil in the suction flow path. It is intended to be.

Another object of the present invention is to secure a stable lubrication amount, stabilize efficiency, and reduce noise even when the operating frequency is reduced, the suction pressure is reduced, or the cylinder is used with a low cylinder capacity. Increase the reliability and increase the reliability,
An object of the present invention is to provide a hermetic compressor having a high efficiency in which a refrigerant gas is prevented from receiving heat by lowering the temperature of oil supplied into an intake passage, thereby increasing a refrigerant circulation amount.

Another object of the present invention is to reduce the head height and supply oil directly into the compression chamber to reduce the operating frequency, reduce the suction pressure, or use the cylinder in a low cylinder volume. Even in such a case, while ensuring a stable refueling amount, stabilizing the efficiency, preventing an increase in noise, and improving reliability, and preventing the refrigerant gas from being received by the oil in the suction passage by the oil, the refrigerant An object of the present invention is to provide a hermetic compressor having a large circulation amount and high efficiency.

[0025]

According to a first aspect of the present invention, there is provided a motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, and a block, and the motor unit and the mechanical unit housed therein. A sealed container storing oil, a valve plate having a suction hole and fixed to an end face side of the cylinder, a suction flow path communicating the suction hole and a suction muffler, and an upper surface side of the cylinder or the block. And an oil capillary having one end opened to the oil reservoir and the other end opened to the suction passage. With this configuration, the oil sucked up from the bottom of the closed vessel to the crankshaft portion lubricates the sliding portion of the crankshaft, then flows out from the upper end of the bearing, flows over the upper surface of the cylinder or block, and returns to the closed container. Return to the bottom of. In the circulation of the oil, a part of the oil flowing on the upper surface of the cylinder or the block continuously flows into the oil reservoir, and the oil is always stored in the oil reservoir. The oil in the oil reservoir is supplied into the suction passage via the oil capillary, and becomes mist oil together with the refrigerant gas flowing in the suction passage to lubricate the piston, cylinder, and the like. At this time, since the oil reservoir is provided on the upper surface side of the cylinder or the block and is located at a high position, the oil reservoir is vertically upward from the upper surface of the oil in the oil reservoir to the insertion portion of the oil capillary into the suction flow path. The head height represented by the distance is considerably lower than before, and in some cases, the head height becomes zero or less. Therefore, even when the operating frequency of the hermetic compressor is reduced, the suction pressure is reduced, or the differential pressure generated between both ends of the oil capillary when the cylinder is used in a low cylinder volume is small, the head height is low, so the oil capillary is low. Has the effect of stabilizing efficiency, stabilizing efficiency, preventing an increase in noise, and increasing reliability.

According to a second aspect of the present invention, there is provided a motor unit,
Machine parts such as crankshaft, piston, cylinder, block, and the motor part and the machine part are housed,
A sealed container storing oil, a valve plate having a suction hole and fixed to an end face side of the cylinder, a suction flow path communicating the suction hole and a suction muffler, and an upper surface side of the cylinder or the block. An oil reservoir provided, and an oil supply passage passing through the cylinder or the block and the valve plate and having one end opening to the oil reservoir and the other end opening to the suction passage or the suction hole. Consists of With this configuration, the effect that the oil is always stored in the oil storage portion is as follows.
This is the same as the first aspect of the present invention. The oil in the oil reservoir is supplied into the suction hole or the suction passage through the oil supply passage, and becomes mist oil together with the refrigerant gas flowing in the suction passage to lubricate the piston, the cylinder, and the like. At this time, since the oil reservoir is provided on the upper surface side of the cylinder or the block and is located at a high position, the oil reservoir extends from the upper surface of the oil in the oil reservoir to the inlet of the oil supply passage or the insertion portion into the suction passage. The head height represented by the vertical upward distance is considerably lower than before, and in some cases, the head height is 0 or less. Therefore, the operating frequency of the hermetic compressor decreases, the suction pressure decreases,
Even when the differential pressure between both ends of the oil supply passage is small when used with a low cylinder capacity, the oil is low and the oil supply passage is stable due to the low head height, stabilizing efficiency, preventing an increase in noise, and reliability. Has an effect of increasing. Further, since the oil supply passage is formed in the cylinder or the block and the valve plate, there is no need to use an oil capillary, and the number of parts is small and the cost can be reduced.

According to a third aspect of the present invention, there is provided a motor unit,
Machine parts such as crankshaft, piston, cylinder, block, and the motor part and the machine part are housed,
An airtight container storing oil, a valve plate having a suction hole and fixed to the end face side of the cylinder, a suction flow passage communicating the suction hole and a suction muffler, the valve plate and the suction flow passage, An oil reservoir provided between the oil reservoir, an oil groove provided on the upper surface of the cylinder and the valve plate and connected to the oil reservoir, and an oil supply communicating the oil reservoir with the suction passage or the suction hole. It consists of a passage. With this configuration, the oil sucked up from the bottom of the closed vessel to the crankshaft portion lubricates the sliding portion of the crankshaft, then flows out from the upper end of the bearing, flows over the upper surface of the cylinder or block, and returns to the closed container. Return to the bottom of. In this oil circulation, a part of the oil flowing on the upper surface of the cylinder or the block continuously flows into the oil reservoir through the oil groove, and the oil is always stored in the oil reservoir. . The oil in the oil reservoir is supplied to the suction passage or the suction hole via the oil supply passage, and becomes mist oil together with the refrigerant gas flowing in the suction passage to lubricate the piston, cylinder, and the like. At this time, the head height, which is represented by the vertical upward distance from the upper surface of the oil in the oil reservoir to the insertion part of the oil supply passage into the suction passage, is considerably lower than in the past, and the normal head height is 0 or less. Therefore,
Even when the operating frequency of the hermetic compressor is reduced, the suction pressure is reduced, or when used in a low cylinder capacity, the head height is low so that stable lubrication can be achieved, stabilizing efficiency and preventing an increase in noise. And has the effect of increasing reliability. Furthermore, if the oil groove is preformed with a cylinder casting mold or valve plate sintering mold, there is no need to process it, and there is no need to use an oil capillary, so the number of parts and processing man-hours are small, It has the effect of reducing costs.

[0028] According to a fourth aspect of the present invention, there is provided a motor unit,
Machine parts such as crankshaft, piston, cylinder, block, and the motor part and the machine part are housed,
A sealed container storing oil, a valve plate having a suction hole and fixed to an end face side of the cylinder, a suction flow path communicating the suction hole and a suction muffler, and an upper surface side of the cylinder or the block. An oil reservoir provided, a compression chamber formed by being surrounded by the cylinder, the piston, and the valve plate; and an oil supply passage having one end opened to the oil reservoir and the other end opened to the compression chamber. And the oil supply passage is configured such that the oil supply passage communicates with the compression chamber only when the piston is near the bottom dead center. With this configuration,
The effect that the oil is always stored in the oil storage portion is the same as that of the first aspect. Further, since the compression chamber is located at a position lower than the oil reservoir, the oil in the oil reservoir flows into the compression chamber via the oil supply passage due to the pressure difference between the closed container and the compression chamber and gravity. At this time, the oil supply passage communicates with the compression chamber only when the piston is near the bottom dead center, that is, only immediately before the end of the suction stroke and only during the initial stage of the compression stroke. Therefore, when the pressure of the refrigerant gas in the compression chamber becomes higher than the pressure in the closed vessel, the oil supply passage is not in communication with the compression chamber, and the refrigerant gas in the compression chamber does not leak from the oil supply passage. Since the oil can be supplied directly into the compression chamber as described above, the refrigerant gas can be prevented from being received by the oil in the suction passage, the refrigerant gas can be sucked into the compression chamber in a state where the temperature is low and the density is large, and the refrigerant circulation amount can be increased. And the effect that the efficiency is increased. In addition, since lubrication is performed using gravity, there is an effect that stable lubrication can be performed regardless of conditions such as the operating frequency, suction pressure, and low cylinder capacity of the hermetic compressor.

According to a fifth aspect of the present invention, there is provided a motor unit,
Machine parts such as crankshaft, piston, cylinder, block, and the motor part and the machine part are housed,
A sealed container storing oil, a valve plate having a suction hole and fixed to an end face side of the cylinder, a suction flow passage communicating the suction hole and the suction muffler, and one end opening into the oil. The other end is open to the suction hole or the suction flow passage near the suction hole, and includes an oil supply passage formed in the valve plate. With this configuration, the refrigerant gas flows in the suction flow path, and the oil at the bottom of the sealed container is supplied into the suction flow path via the oil supply path in the same principle as that of the conventional oil capillary. It becomes mist oil with the flowing refrigerant gas and lubricates pistons, cylinders and the like. At this time, the upper end of the oil supply passage is open near the suction hole which is a relatively low position, and the vertical direction from the upper surface of the oil at the bottom of the closed container to the suction hole of the oil supply passage or the insertion portion into the suction flow passage. The head height represented by the upward distance is considerably lower than before. Therefore, the operating frequency of the hermetic compressor decreases,
Even when the suction pressure is low or when the differential pressure between both ends of the oil supply passage is small when used with a low cylinder capacity, the head height is low and stable oiling is possible, stabilizing the efficiency and preventing an increase in noise. And has the effect of increasing reliability. Further, since the oil supply passage is formed in the valve plate, it is almost the shortest length from the oil at the bottom of the closed vessel to the suction hole, and is shorter than the length of the conventional oil capillary. Therefore, the amount of heat received while the oil flows in the oil supply passage is small, the temperature of the oil to be supplied becomes low, the heat of the refrigerant gas is prevented, the amount of circulated refrigerant is increased, and the efficiency is increased. Further, since the oil supply passage is formed in the valve plate, there is no need to use an oil capillary, and the number of parts is small and the cost can be reduced.

According to a sixth aspect of the present invention, there is provided a motor unit,
Machine parts such as crankshaft, piston, cylinder, block, and the motor part and the machine part are housed,
A sealed container for storing oil, a valve plate having a suction hole and fixed to an end face side of the cylinder, a suction flow path communicating the suction hole with a suction muffler, the cylinder, the piston, and the valve plate And a refueling passage having one end opening into the oil and the other end opening into the compression chamber, and the refueling passage only when the piston is near bottom dead center. The oil supply passage is configured to communicate with the compression chamber. With this configuration, the oil supply passage communicates with the compression chamber only when the piston is near the bottom dead center, that is, only during the period immediately before the end of the suction stroke and the beginning of the compression stroke. The pressure in the compression chamber near the bottom dead center of the piston is lower than the pressure in the closed container due to the flow path resistance generated when the refrigerant gas passes through the suction valve, etc., so that the oil is sucked up and supplied directly to the compression chamber. Is done. When the pressure of the refrigerant gas in the compression chamber becomes higher than the pressure in the closed vessel, the oil supply passage is not in communication with the compression chamber, and the refrigerant gas in the compression chamber does not leak from the oil supply passage. Since the oil can be supplied directly into the compression chamber as described above, the refrigerant gas can be prevented from being received by the oil in the suction passage, the refrigerant gas can be sucked into the compression chamber in a state where the temperature is low and the density is large, and the refrigerant circulation amount can be increased. Many,
It has the effect of increasing efficiency. In addition, since the lift height, which is represented by the vertically upward distance from the upper surface of the oil at the bottom of the sealed container to the insertion portion of the oil supply passage into the compression chamber, is considerably lower than in the past, the operating frequency decreases,
Even when the suction pressure is reduced or the cylinder is used with a low cylinder capacity, it has an effect of securing a stable oil supply amount, stabilizing efficiency, preventing an increase in noise, and increasing reliability.

[0031]

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 in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a side sectional view of a hermetic compressor according to Embodiment 1 of the present invention. FIG.
FIG. 2 is a sectional view of a main part of the hermetic-type compressor of the embodiment.

1 and 2, reference numeral 30 denotes a cylinder 6
An oil reservoir 31 is provided on the upper surface side of the oil capillary 31. One end of the oil capillary 31 is opened to the oil reservoir 30, and the other end is opened to the suction passage 23. H is the oil reservoir 3
0 is a lift height represented by a vertically upward distance from the upper surface of the oil 24 to the insertion portion of the oil capillary 31 into the suction passage 23.

The operation of the hermetic compressor constructed as described above will be described below.

From the bottom of the closed container 1, the crankshaft 28
The oil 24 sucked up by the crankshaft 2
After lubricating the sliding portion 8, it flows out from the upper end of the bearing 11 and flows on the upper surface of the cylinder 6 and the block 5,
It returns to the bottom of the closed container 1 again. In the circulation of the oil 24, part of the oil 24 flowing on the upper surface of the cylinder 6 or the block 5 continuously flows into the oil reservoir 30, and the oil 24 is always stored in the oil reservoir 30. Become. The oil 24 in the oil reservoir 30 is supplied into the suction passage 23 via the oil capillary 31, and is supplied to the suction passage 2.
The refrigerant gas flows into the mist 3 and becomes mist oil to lubricate the piston 8, the cylinder 6, and the like. At this time, since the oil reservoir 30 is provided on the upper surface side of the cylinder 6 and is located at a high position, the head height H is considerably lower than that in the related art. Therefore, even when the operating frequency of the hermetic type compressor is reduced, the suction pressure is reduced, or when the differential pressure generated between both ends of the oil capillary 31 when used in a low cylinder capacity is small, the head height H is low. Oil capillary 3
1 enables stable refueling, stabilizes efficiency, prevents an increase in noise, and increases reliability.

As described above, the hermetic-type compressor of the present embodiment includes the oil reservoir 3 provided on the upper surface of the cylinder 6.
0, an oil capillary 31 having one end opened to the oil reservoir 30 and the other end opened to the suction passage 23 is provided. Even when the pressure drops or when the cylinder is used with a low cylinder capacity, the oil supply from the oil capillary 31 is ensured to ensure stable oil supply, stabilizing efficiency, preventing an increase in noise, and a highly reliable sealed type. It can be a compressor.

(Embodiment 2) FIG. 3 is a sectional view of a main part of a hermetic compressor according to Embodiment 2 of the present invention.

In FIG. 3, reference numeral 32 denotes a valve plate having the suction hole 16 and fixed to the end face side of the cylinder 33; 34, an oil reservoir provided on the upper surface side of the cylinder 33; An oil supply passage that passes through the inside and the inside of the valve plate 32, has one end opened to the oil reservoir 34, and the other end opened to the suction hole 16.

The operation of the hermetic compressor configured as described above will be described below.

The operation in which the oil 24 is always stored in the oil storage section 34 is the same as in the first embodiment. The oil 24 in the oil reservoir 34 is supplied into the suction hole 16 through the oil supply passage 35 according to the same principle as the conventional oil capillary 25, and becomes mist-like oil 24 together with the refrigerant gas flowing through the suction hole 16. Lubricate the piston 8, the cylinder 33 and the like. At this time, since the oil reservoir 34 is provided on the upper surface side of the cylinder 33 and is located at a high position, the oil reservoir 34 extends vertically from the upper surface of the oil 24 of the oil reservoir 34 to the insertion portion of the oil supply passage 35 into the suction hole 16. The head height represented by the distance upward in the direction becomes 0 or less. Therefore,
Even when the operating frequency of the hermetic compressor is low, the suction pressure is low, or when the differential pressure between the ends of the oil capillary is small when used in a low cylinder capacity, the head height is low and the oil supply passage is stable. Refueling, stabilizing efficiency, preventing an increase in noise, and increasing reliability. Further, the oil supply passage 35 is provided between the cylinder 33 and the valve plate 3.
Since it is formed in the inside 2, there is no need to use an oil capillary, the number of parts is small, and the cost can be reduced.

As described above, the hermetic compressor according to the present embodiment includes the valve plate 32 having the suction hole 16 and fixed to the end face of the cylinder 33, and the oil reservoir provided on the upper face of the cylinder 33. 34, an oil supply passage 35 that passes through the inside of the cylinder 33 and the valve plate 32, and has one end opened to the oil reservoir 34 and the other end opened to the suction hole 16, so that an oil capillary is used. By ensuring a more stable lubrication than before, it is possible to stabilize efficiency, prevent an increase in noise, achieve a high reliability, a small number of parts, and a low cost hermetic compressor.

(Embodiment 3) FIG. 4 is a cross-sectional view of a main part of a hermetic compressor according to Embodiment 3 of the present invention.

In FIG. 4, reference numeral 36 denotes a valve plate having the suction hole 16 and fixed to the end face side of the cylinder 37, and reference numeral 38 denotes a suction flow passage communicating the suction hole 16 and the suction muffler 21. Reference numeral 39 denotes an oil reservoir provided between the valve plate 36 and the suction passage 38. 40 is provided on the upper surface of the cylinder 37 and the valve plate 36,
The oil groove is connected to the oil reservoir 39. An oil supply passage 41 communicates the oil reservoir 39 with the suction passage 38.

The operation of the hermetic compressor constructed as described above will be described below.

The oil 24 sucked from the bottom of the closed casing 1 to the crankshaft 9 lubricates the sliding portion between the crankshaft 9 and the bearing 11 and then lubricates the bearing 11.
Out of the upper end of the container, flows on the upper surface of the cylinder 37 and the block 5 and returns to the bottom of the closed container 1 again. In the circulation of the oil 24, a part of the oil 24 flowing on the upper surface of the cylinder 37 and the block 5 continuously flows into the oil reservoir 39 through the oil groove 40, and the oil reservoir 39 always has the oil therein. 24 is stored. The oil 24 in the oil reservoir 39 is the same as that of the conventional oil capillary 2.
The oil is supplied into the suction passage 38 through the oil supply passage 41 in the same principle as that of the piston 5, and becomes the mist-like oil 24 together with the refrigerant gas flowing in the suction passage 38.
Lubricate etc. At this time, the oil 2 in the oil reservoir 39
The height of the head, which is represented by the vertically upward distance from the upper surface of the fuel supply passage 4 to the insertion portion of the oil supply passage 41 into the suction passage 38, is 0 or less. Therefore, even when the operating frequency of the hermetic compressor is reduced, the suction pressure is reduced, or even when the compressor is used in a low cylinder capacity, the head height is low, so that stable lubrication can be performed, the efficiency is stabilized, and noise is increased. And reliability is increased. Further, if the oil groove 40 is formed in advance by using a casting mold of the cylinder 37 or a sintering mold of the valve plate 36, there is no need for processing, and there is no need to use an oil capillary. Less,
Cost can be reduced.

As described above, the hermetic-type compressor of the present embodiment has the valve plate 36 having the suction hole 16 and fixed to the end face side of the cylinder 37, and the suction connecting the suction hole 16 and the suction muffler 21. The flow path 38 and the valve plate 36
Oil reservoir 39 provided between the suction passage 38 and
And an oil groove 40 provided on the upper surface of the cylinder 37 and the valve plate 36 and connected to the oil reservoir 39, and an oil supply passage 4 communicating the oil reservoir 39 and the suction passage 38.
As it has a structure equipped with 1, without using an oil capillary, without further processing into parts, by securing a more stable lubrication than before, stabilize efficiency, prevent noise increase, A hermetic compressor having high reliability, a small number of parts and processing steps, and a low cost can be provided.

(Embodiment 4) FIG. 5 is a sectional view of a main part of a hermetic compressor according to Embodiment 4 of the present invention. FIG.
FIG. 3 is a characteristic diagram showing a relationship between pressures of various parts of the hermetic compressor of the embodiment and a communication range of an oil supply passage.

In FIG. 5, reference numeral 42 denotes an oil reservoir provided on the upper surface side of the cylinder 43, and reference numeral 44 denotes a compression chamber formed by being surrounded by the cylinder 43, the piston 8, and the valve plate 15. 45 is an oil reservoir 42 at one end.
, And the other end is an oil supply passage that opens into the compression chamber 44. The oil supply passage 45 is opened so as to communicate with the inside of the compression chamber 44 only when the piston 8 is near the bottom dead center.

The operation of the hermetic compressor configured as described above will be described below.

The operation in which the oil 24 is always stored in the oil storage section 42 is the same as in the first embodiment. Further, the compression chamber 44 is located at a position lower than the oil reservoir 42, and the oil in the oil reservoir 42 is subjected to a pressure difference between the pressure in the closed vessel 1 and the pressure in the compression chamber 44 and two propulsive forces of gravity. It flows into the compression chamber 44 via the oil supply passage 45. At this time, as shown in FIG. 6, the oil supply passage 45 communicates with the inside of the compression chamber 44 only when the piston 8 is near the bottom dead center, that is, only during the period from immediately before the end of the suction stroke to the beginning of the compression stroke. The oil is supplied by a pressure difference between the pressure and the inside of the compression chamber 44 and gravity. Therefore, when the pressure of the refrigerant gas in the compression chamber 44 becomes higher than the pressure in the closed container, the oil supply passage 45 is not in communication with the inside of the compression chamber 44, and
The refrigerant gas inside does not leak from the oil supply passage 45. Since the oil can be directly supplied into the compression chamber 44 in this manner, the refrigerant gas can be prevented from being received by the oil 24 in the suction passage 23, and the refrigerant gas is transferred into the compression chamber 44 at a low temperature and a high density. Inhalation is possible, the refrigerant circulation amount is large, and efficiency is high. In addition, since lubrication is performed using gravity, stable lubrication can be achieved regardless of conditions such as the operating frequency, suction pressure, and low cylinder capacity of the hermetic compressor.

As described above, the hermetic-type compressor of the present embodiment has the oil reservoir 42 provided on the upper surface side of the cylinder 43, and the compression formed by being surrounded by the cylinder 43, the piston 8, and the valve plate 15. A chamber 44 and an oil supply passage 45 having one end opened to the oil reservoir 42 and the other end opened to the compression chamber 44. The oil supply passage 45 is provided in the compression chamber 44 only when the piston 8 is near the bottom dead center. The oil is directly connected to the compression chamber using gravity to secure a stable oil supply regardless of the operating frequency, suction pressure, low cylinder volume, etc. Stabilize, prevent the increase of noise, and increase the reliability,
It is possible to prevent the refrigerant gas from being received by the oil 24 in the suction flow path 23 and to achieve a highly efficient hermetic compressor with a large amount of refrigerant circulation.

(Embodiment 5) FIG. 7 is a sectional view of a main part of a hermetic compressor according to Embodiment 5 of the present invention.

In FIG. 7, reference numeral 46 denotes a valve plate having a suction hole 16 and fixed to the end face side of the cylinder 6, and 47 denotes one end which opens into the oil 24 at the bottom of the sealed container 1 and the other end suctions. The valve plate 46 is opened in the hole 16.
It is a refueling passage formed in. H is a lift height represented by a vertically upward distance from the upper surface of the oil 24 at the bottom of the closed container 1 to the insertion portion of the oil supply passage 47 into the suction hole 16.

The operation of the hermetic compressor configured as described above will be described below.

The flow of the refrigerant gas in the suction passage 23 causes the same principle as that of the conventional oil capillary 25 to be used.
The oil 24 at the bottom of the sealed container 1 is supplied into the suction passage 23 through the oil supply passage 47, and becomes the atomized oil 24 together with the refrigerant gas flowing in the suction passage 23 to lubricate the piston 8, the cylinder 6, and the like. . At this time, the upper end of the fuel supply passage 47 is open to the suction hole 16 which is a relatively low position, and the head height H is considerably lower than in the conventional case. Therefore, even when the operating frequency of the hermetic compressor is reduced, the suction pressure is reduced, or the differential pressure generated between both ends of the oil supply passage when the cylinder is used with a low cylinder capacity is small, the head height H is low, so that it is stable. Refueling, stabilizing efficiency, preventing an increase in noise, and increasing reliability. Further, since the oil supply passage 47 is formed in the valve plate 46, the closed container 1
The length is almost the shortest from the bottom oil 24 to the suction hole 16 and is shorter than the length of the conventional oil capillary 25. Therefore, the amount of heat received while the oil 24 flows in the oil supply passage 47 is small, the temperature of the oil 24 to be oiled is low, the heat reception of the refrigerant gas is prevented, and the refrigerant circulation amount is large.
Increases efficiency. Further, since the oil supply passage 47 is formed in the valve plate 56, it is not necessary to use an oil capillary, the number of parts is small, and the cost can be reduced.

As described above, the hermetic-type compressor of the present embodiment has the valve plate 46 having the suction hole 16 fixed to the end face side of the cylinder 6 and one end in the oil 24 at the bottom of the hermetic container 1. It is open and the other end is opened to the suction hole 16 and is provided with the oil supply passage 47 formed in the valve plate 46. Therefore, the operating frequency is reduced, the suction pressure is reduced, and the low cylinder capacity is reduced. Even when used in, by ensuring a stable oil supply amount, stabilizing the efficiency, preventing an increase in noise, and increasing the reliability, and by lowering the temperature of the oil 24 supplied to the suction passage, By preventing heat reception of the refrigerant gas, a hermetic compressor with high refrigerant circulation amount and high efficiency can be provided.

(Embodiment 6) FIG. 8 is a sectional view of a main part of a hermetic compressor according to Embodiment 6 of the present invention. Also,
The characteristic diagram showing the relationship between the pressure of each part of the hermetic compressor of the embodiment and the communication range of the oil supply passage is the same as FIG.

In FIG. 8, reference numeral 48 denotes a compression chamber formed by being surrounded by a cylinder 49, a piston 8, and a valve plate 15. Reference numeral 50 denotes an opening in the oil 24 at one end and an opening in the compression chamber 48 at the other end. Refueling passage. Refueling passage 5
0 is open so that it communicates with the inside of the compression chamber 48 only when the piston 8 is near the bottom dead center. H is a lift height represented by a vertically upward distance from the upper surface of the oil 24 at the bottom of the closed container 1 to the insertion portion of the oil supply passage 50 into the compression chamber 48.

The operation of the hermetic compressor configured as described above will be described below.

As shown in FIG. 6, the oil supply passage 50 communicates with the inside of the compression chamber 48 only when the piston 8 is near the bottom dead center, that is, only during the period immediately before the end of the suction stroke and the beginning of the compression stroke. The pressure in the compression chamber 48 near the bottom dead center of the piston 8 is
Due to the flow path resistance generated when the refrigerant gas passes through the suction valve 17 and the like, the pressure becomes lower than the pressure in the closed vessel 1, so that the oil 24 is sucked up and supplied directly into the compression chamber 48. When the pressure of the refrigerant gas in the compression chamber 48 becomes higher than the pressure in the closed container, the oil supply passage 50 is connected to the compression chamber 4.
8, the refrigerant gas in the compression chamber 48 does not leak from the oil supply passage 50. Thus, the compression chamber 48
Since the oil can be directly supplied to the inside, the refrigerant gas can be prevented from being received by the oil 24 in the suction passage 23, the refrigerant gas can be sucked into the compression chamber 48 at a low temperature and a high density, and the refrigerant circulation amount And the efficiency is high. The head height H is considerably lower than before, so even when the operating frequency is reduced, the suction pressure is reduced, or when the cylinder is used with a low cylinder capacity, a stable refueling amount is secured and the efficiency is stabilized. This can prevent an increase in noise and increase reliability.

As described above, the hermetic compressor according to the present embodiment comprises the cylinder 49, the piston 8, the valve plate 15
A compression chamber 48 formed by being surrounded by
Refueling passage 5 which opens into the inside and the other end opens into the compression chamber 48
0, and the refueling passage 50 is opened so that the piston 8 communicates with the inside of the compression chamber 48 only when the piston 8 is near the bottom dead center. By doing so, even if the operating frequency is reduced, the suction pressure is reduced, or if the cylinder is used with a low cylinder capacity, a stable oil supply is ensured, the efficiency is stabilized, and the noise is prevented from increasing.
In addition, it is possible to improve the reliability and prevent the refrigerant gas from being received by the oil 24 in the suction passage 23, thereby providing a hermetic compressor having a large refrigerant circulation amount and high efficiency.

[0062]

As described above, according to the first aspect of the present invention, the oil reservoir provided on the upper surface side of the cylinder or the block has one end opened to the oil reservoir and the other end provided in the suction passage. The oil capillaries are designed to have an oil capillary that opens to the air, so even if the operating frequency of the hermetic compressor is reduced, the suction pressure is reduced, or the cylinder is used with a low cylinder capacity, the amount of oil supplied from the oil capillary can be reduced. Secure and stable lubrication, stabilize efficiency, prevent noise increase,
A highly reliable hermetic compressor can be obtained.

The invention according to claim 2 is characterized in that a valve plate having a suction hole and fixed to the end face side of the cylinder, an oil reservoir provided on the upper surface side of the cylinder or the block, Through the inside and the valve plate, one end opens to the oil reservoir,
The other end is provided with an oil supply passage that opens to the suction hole.This ensures stable oil supply more than before without using an oil capillary, stabilizing efficiency and preventing an increase in noise. A hermetic compressor having high reliability, a small number of parts, and low cost can be provided.

The invention according to claim 3 provides a valve plate having a suction hole and fixed to the end face side of the cylinder, a suction flow passage communicating the suction hole with the suction muffler, a valve plate and the suction flow passage. An oil sump provided between the passage and the upper surface of the cylinder and the valve plate,
It has an oil groove that connects to the oil reservoir and an oil supply passage that connects the oil reservoir to the suction passage or suction hole. By securing the above stable lubrication, it is possible to stabilize the efficiency, prevent an increase in noise, achieve high reliability, reduce the number of parts and processing steps, and achieve a low cost hermetic compressor.

According to a fourth aspect of the present invention, there is provided an oil reservoir provided on an upper surface side of a cylinder or a block, a compression chamber formed by being surrounded by a cylinder, a piston, and a valve plate; The oil supply passage is opened to communicate with the compression chamber only when the piston is near the bottom dead center. By supplying oil directly to the compression chamber, a stable oil supply is ensured irrespective of conditions such as operating frequency, suction pressure, and low cylinder volume, stabilizing efficiency, preventing an increase in noise, and increasing reliability. At the same time, it is possible to prevent the refrigerant gas from being received by the oil in the suction passage, thereby providing a highly efficient hermetic compressor having a large refrigerant circulation amount.

Further, the invention according to claim 5 is characterized in that a valve plate having a suction hole and fixed to the end face side of the cylinder, one end of which opens into the oil at the bottom of the sealed container, and the other end of which has a suction hole or Opened in the suction flow path near the suction hole and provided with an oil supply passage formed in the valve plate, so that the operating frequency is reduced, the suction pressure is reduced, or when used in a low cylinder capacity. However, by ensuring a stable oil supply, stabilizing efficiency, preventing an increase in noise, improving reliability, and lowering the temperature of oil supplied to the suction passage, the heat received by the refrigerant gas can be reduced. Prevent,
A hermetic compressor having a large amount of refrigerant circulation and high efficiency can be obtained.

Further, the invention according to claim 6 is characterized in that a compression chamber formed by being surrounded by a cylinder, a piston and a valve plate, and an oil supply passage having one end opened into the oil and the other end opened into the compression chamber. The oil supply passage is open so that it communicates with the compression chamber only when the piston is near the bottom dead center, so lowering the head height and supplying oil directly to the compression chamber lowers the operating frequency. Or when the suction pressure is reduced or the cylinder is used with a low cylinder capacity, ensure a stable oil supply, stabilize the efficiency, prevent the noise from increasing, increase the reliability, and increase the reliability To prevent the refrigerant gas from receiving heat by the oil, and the refrigerant circulation amount is large,
A highly efficient hermetic compressor can be provided.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of an essential part of the hermetic compressor according to the embodiment.

FIG. 3 is a sectional view of a main part of a hermetic compressor according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a third embodiment of a hermetic compressor according to the present invention.

FIG. 5 is a sectional view of a main part of a fourth embodiment of a hermetic compressor according to the present invention.

FIG. 6 is a characteristic diagram showing the relationship between the pressure of each part and the communication range of the oil supply passage in the fourth embodiment and the sixth embodiment of the hermetic compressor according to the present invention.

FIG. 7 is a sectional view of a main part of a fifth embodiment of a hermetic compressor according to the present invention.

FIG. 8 is a sectional view of a main part of a sixth embodiment of the hermetic compressor according to the present invention.

FIG. 9 is a front sectional view of a conventional hermetic compressor.

FIG. 10 is a side sectional view taken along the line AA of FIG. 9;

FIG. 11 is a sectional view of a main part of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Machine part 3 Motor part 5 Block 6 Cylinder 8 Piston 9 Crankshaft 15 Valve plate 16 Suction hole 21 Suction muffler 23 Suction flow path 24 Oil 30 Oil storage part 31 Oil capillary 32 Valve plate 33 Cylinder 34 Oil storage part 35 Oil supply passage 36 Valve plate 37 Cylinder 38 Intake flow path 39 Oil reservoir 40 Oil groove 41 Oil supply passage 42 Oil reservoir 43 Cylinder 44 Compression chamber 45 Oil supply passage 46 Valve plate 47 Oil supply passage

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[Procedure amendment]

[Submission date] February 7, 2001 (2001.2.7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (6)

[Claims] 1. A motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, a block, etc., a closed container containing the motor unit and the mechanical unit and storing oil, and a cylinder having a suction hole. A valve plate fixed to the end face of the cylinder, a suction passage communicating the suction hole and the suction muffler, an oil reservoir provided on the upper surface side of the cylinder or the block, and one end of the oil reservoir provided to the oil reservoir. A hermetic compressor comprising an oil capillary which is open and the other end of which is open in the suction passage. 2. A motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, and a block, a closed container containing the motor unit and the mechanical unit and storing oil, and a cylinder having a suction hole. A valve plate fixed to the end face of the cylinder, a suction flow path communicating the suction hole with the suction muffler, an oil reservoir provided on the upper surface side of the cylinder or the block, and inside the cylinder or the block. And an oil supply passage passing through the valve plate and having one end open to the oil reservoir and the other end opening in the suction flow passage or the suction hole. 3. A motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, a block, etc., a closed container containing the motor unit and the mechanical unit and storing oil, and a cylinder having a suction hole. A valve plate fixed to the end face side of the valve, a suction passage communicating the suction hole and the suction muffler, an oil reservoir provided between the valve plate and the suction passage, the cylinder and the cylinder. A hermetic compressor comprising: an oil groove provided on an upper surface of a valve plate and connected to the oil reservoir; and an oil supply passage communicating the oil reservoir with the suction passage or the suction hole. 4. A motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, a block, etc., a closed container containing the motor unit and the mechanical unit and storing oil, and a cylinder having a suction hole. A valve plate fixed to the end face side of the cylinder, a suction passage communicating the suction hole and the suction muffler, an oil reservoir provided on the upper surface side of the cylinder or the block, the cylinder, the piston, A compression chamber formed by being surrounded by a valve plate, and an oil supply passage having one end opened to the oil reservoir and the other end opened to the compression chamber, and the piston is provided only when the piston is near bottom dead center. A hermetic compressor in which the oil supply passage is configured such that the oil supply passage communicates with the compression chamber. 5. A motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, a block, etc., a closed container containing the motor unit and the mechanical unit and storing oil, and a cylinder having a suction hole. A valve plate fixed to an end surface of the suction port, a suction flow path communicating the suction hole with the suction muffler, one end opening into the oil, and the other end being the suction hole or the suction port near the suction hole. A hermetic compressor comprising an opening in a flow passage and an oil supply passage formed in the valve plate. 6. A motor unit, a mechanical unit such as a crankshaft, a piston, a cylinder, and a block, a closed container containing the motor unit and the mechanical unit and storing oil, and a cylinder having a suction hole. A valve plate fixed to the end surface of the cylinder, a suction passage communicating the suction hole and the suction muffler, a compression chamber formed by being surrounded by the cylinder, the piston, and the valve plate; The oil supply passage is formed such that the oil supply passage communicates with the compression chamber only when the piston is near the bottom dead center. Hermetic compressor.