JP3374081B2 - Hermetic rotary compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a hermetic rotary compressor, and more particularly to a structure for quickly eliminating the phenomenon of refrigerant stagnation in an oil sump.

[0002]

2. Description of the Related Art As a hermetic rotary compressor in which a rotary shaft is driven by an electric element and gas is compressed by rotation of a roller, a hermetic rotary compressor is disclosed in, for example, Japanese Unexamined Patent Publication No. 6-323281 (F0).
4C29 / 02) are known. FIG. 4 shows the structure of such a conventional hermetic rotary compressor 100.

That is, in FIG. 4, an electric element D composed of a stator 2 and a rotor 3 and a rotary compression element AA composed of a cylinder 107, a roller 9 and the like are housed inside a closed container 1. The rotor 3 of the electric element D is coupled to the upper part of the rotary shaft 4, and the rotary pongee 4 is rotatably supported by the upper bearing 102 and the lower bearing 103.

Upper and lower bearings 102, 103 of the rotary shaft 4
An eccentric portion 4A is provided between the rollers, and the roller 9 that eccentrically rotates in the cylinder 107 is fitted in the eccentric portion 4A.

The cylinder 107 is provided with a blade which is always kept in contact with the roller 9 by a spring (not shown). Then, from the suction pipe 13, the cylinder 107
The gas sucked therein is compressed as the volume of the compression chamber 17 surrounded by the blade, the roller 9, the upper and lower bearings 102 and 103, and the cylinder 107 is reduced as the roller 9 rotates, and is discharged (not shown). After being discharged into the discharge muffler 11 through the outlet and the discharge valve, it is discharged into the closed container 1 from a small hole (not shown) formed in the discharge muffler 11. The gas discharged into the closed container 1 is discharged from the discharge pipe 12 to the outside of the closed container 1 through the gap between the stator 2 and the rotor 3. Reference numeral 15 is an accumulator connected to the suction pipe 13.

On the other hand, below the closed container 1 is an oil sump 8, and a predetermined amount of oil is stored in this oil sump 8. Then, the oil stored in the oil sump 8 is pumped up by the oil pump 10 provided at the lower end of the rotary shaft 4 and pushed up in the rotary shaft 4, and the rotary compression element AA including the cylinder 107, the roller 9, and the like.
And the sliding surfaces of the rotating shaft 4 and the like are lubricated.

The tip of the rotary shaft 4 extends to the vicinity of the lower part of the oil sump 8, whereby the oil sump 8
Even when the amount of oil stored in is reduced, the oil is pumped up to prevent abrasion of the sliding surfaces such as the rotary compression element AA and the rotary shaft 4.

[0008]

In such a structure, when an oil that is incompatible with the refrigerant is used and the hermetic rotary compressor 100 is stopped for a predetermined time, the refrigerant in the hermetic container 1 becomes an oil. I fall asleep in pool 8. In this state, the refrigerant having a high specific gravity forms a layer under the oil and lays down, so that the oil sump 8 immediately after the compressor starts.
The upper side of the stored refrigerant is blocked with oil, and it is difficult for the refrigerant to escape to the top of the oil. As a result, there is a problem in that the cooling performance (pull-down performance) immediately after startup is reduced.

Further, if the refrigerant stagnates in the lower part of the oil sump 8, only the refrigerant will be pumped up from the oil pump 10, and the oil will not be lubricated on the sliding surface and will be worn. It was

The present invention has been made in order to solve the problems of the prior arts described above, and has a simple structure in which the circulation of refrigerant and the lubrication performance of oil are improved immediately after the compressor is started up. The purpose is to provide a machine.

[0011]

[Means for Solving the Problems] That is, a hermetic compressor according to the present invention includes an electric element housed in a hermetic container, and a rotation housed in the hermetic container and driven by a rotating shaft of the electric element. In a hermetic rotary compressor including a compression element, a communication passage that connects the discharge side of the rotary compression element and an oil sump in the hermetic container, and the pressure and oil on the discharge side of the rotary compression element at startup. The communication passage is opened due to the pressure difference in the sump, and then the pressure on the discharge side and the oil sump
A valve mechanism that closes the communication passage by reducing the force difference is provided.

Further, in the hermetic rotary compressor according to a second aspect of the present invention, in the above, the valve mechanism is made of a spring material having a constant elastic force.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a hermetic rotary compressor C of the present invention.
2 is a vertical sectional side view, and FIG. 2 is an enlarged vertical sectional side view of a main part of the hermetic rotary compressor C. In addition, in FIG.
The same reference numerals as in FIG. In the hermetic rotary compressor C of the present invention, the electric element D including the stator 2 and the rotor 3 is provided inside the hermetic container 1 as described above.
A rotary compression element A including a cylinder 7 and rollers 9 and the like are stored.

The rotor 3 of the electric element D is connected to the upper part of the rotary pongee 4, and the rotary shaft 4 has an upper bearing 5 and a lower bearing 6.
It is rotatably supported by. The upper bearing 5 and the lower bearing 6 are fixed to the cylinder 7 so as to seal the upper and lower openings of the cylinder 7. An eccentric portion 4A is formed between the upper and lower bearings 5 and 6 of the rotary shaft 4, and the eccentric portion 4A is formed.
The roller 9 which is eccentrically rotated in the cylinder 7 is fitted into the cylinder.

The cylinder 7 is provided with a blade (not shown) which is kept in contact with the roller 9 by a spring (not shown) at all times. Further, the vertical dimension of the roller 9 is made smaller than the vertical dimension of the cylinder 7, whereby a space is formed between the upper end surface of the roller 9 and the upper bearing 5. Reference numeral 15 is an accumulator connected to the suction pipe 13.

An oil sump 8 is provided below the closed container 1.
A predetermined amount of oil (not shown) is stored in the oil sump 8, the lower end of the rotary shaft 4 extends to the vicinity of the lower part of the oil sump 8, and an oil pump 10 is provided inside. There is. The oil in the oil sump 8 is pumped up by the oil pump 10 and pushed up in the rotary shaft 4, and the rotary compression element A including the cylinder 7, the roller 9, and the sliding surface of the rotary shaft 4 are lubricated.

On the other hand, a muffler 11 is provided on the discharge side of the rotary compression element A, and a communication passage 18 is provided between the muffler 11 and the oil sump 8, and the communication passage 18 allows the inside of the muffler 11 and the oil to flow. It communicates with the pool 8. The communication passage 18 is formed continuously with a relatively large through hole 31 formed in the upper bearing 5, a narrow passage 19 formed vertically through the cylinder 7, and a lower portion of the narrow passage 19. The housing 32 and the through hole 3 formed in the lower bearing 6.
3, the narrow passage 19 communicates with the through hole 31 and the storage portion 32 communicates with the through hole 33.

A valve mechanism 34 is provided in the accommodating portion 32. The valve mechanism 34 has an opening / closing valve 36 at the upper end and a coil spring 20 as a spring member pressed against the opening / closing valve 36.
It consists of and. The coil spring 20 has a certain elastic force, and the on-off valve 36 is constantly urged toward the narrow passage 19 side by the coil spring 20, and the communication passage 18 is closed at the outlet of the narrow passage 19. Then, the pressure inside the rotary compression element A (the pressure inside the muffler 11) is accumulated in the oil reservoir 8
The coil spring 20 is compressed downward so that the opening / closing valve 36 opens the communication passage 18 when the pressure becomes higher than the internal pressure and a pressure difference of a predetermined value or more occurs.

Next, the operation of the above configuration will be described. now,
The hermetic rotary compressor C is stopped, and the refrigerant is in the hermetic container 1
It lies inside and is stored in the lower part of the oil sump 8.
When the hermetic rotary compressor C is started in this state, the gas refrigerant sucked into the cylinder 7 through the suction pipe 13 causes the volume of the compression chamber 17 surrounded by the blade, the roller 9, the lower bearing 6 and the cylinder 7 to be compressed. Is reduced as the roller 9 rotates and is compressed. The gas refrigerant that has been compressed in the compression chamber 17 and becomes high temperature and high pressure is discharged into the discharge muffler 11 through a discharge port and a discharge valve (not shown), and then the discharge muffler 1
1 is discharged into the closed container 1 through a small hole (not shown) provided in the container 1.

At this time, the pressure in the discharge muffler 11 rapidly rises and becomes higher than the pressure in the oil sump 8. When a difference between the pressure in the muffler 11 and the pressure in the oil sump 8 exceeds a predetermined value, the on-off valve 36 is pushed down against the biasing force of the coil spring 20 and the communication passage 18 is opened. As a result, the muffler 11 and the oil sump 8
The inside is communicated.

When the muffler 11 and the oil sump 8 are communicated with each other, the high-pressure gas refrigerant in the muffler 11 is vigorously discharged into the oil sump 8 to stir the refrigerant and oil in the oil sump 8. Become.

As a result, the refrigerant sunk in the oil sump 8 becomes easy to escape from the oil, is gasified, and is rapidly discharged into the closed container 1. Then, the refrigerant that has been laid down by the stirring flows out, so that the lower end of the rotating shaft 4 is filled with oil instead of the refrigerant.

Therefore, the oil can be pumped up from the lower end of the rotary shaft 4, and the oil can be smoothly supplied to each sliding surface. This makes it possible to prevent wear of the sliding surface.

Since the pressure in the closed container 1 rises due to the discharge of the gas refrigerant from the muffler 11, the pressure difference between the muffler 11 and the oil sump 8 rapidly decreases or disappears thereafter. Therefore, since the coil spring 20 is expanded again and the communication passage 18 is closed by the opening / closing valve 36, the stirring in the oil reservoir 8 is performed only at the time of starting.

Next, FIG. 3 shows another embodiment of the present invention. In this case, instead of the coil spring as the spring material,
A leaf spring 20A curved in a U shape is used. Then, the leaf spring 20A is accommodated in the slightly larger storage portion 32A while lying sideways, and the on-off valve 36 is attached to the upper surface of the leaf spring 20A in this state. The other structure is similar to that of FIG.

Like the above-mentioned coil spring, the leaf spring 20A also constantly urges the opening / closing valve 36 toward the narrow passage 19 side so that the communication passage 18 is formed.
Is closed. Similarly, immediately after the start of the hermetic rotary compressor C, the leaf spring 20A similarly causes the inside of the muffler 11 and the oil sump 8
The communication passage 18 is opened when a predetermined pressure difference occurs therein, and then the communication passage 18 is closed by reducing the pressure difference between the muffler 11 and the oil sump 8. As a result, the same effect as that of the communication passage 18 described above is exhibited.

[0027]

As described above in detail, according to the present invention, there are provided the electric element housed in the closed container and the rotary compression element housed in the closed container and driven by the rotating shaft of the electric element. In a hermetic rotary compressor, when the difference between the pressure on the discharge side of the rotary compression element and the pressure on the oil sump increases, as well as the communication passage that connects the discharge side of the rotary compression element and the oil sump in the hermetic container. Since the valve mechanism for opening the passage is provided, the oil sump is agitated by the discharge gas immediately after the start-up, and the refrigerant and the oil lying in the oil sump are mixed with each other, so that the refrigerant easily escapes.

As a result, it becomes possible to prevent the refrigerant circulation amount in the refrigeration cycle from decreasing. Further, since the refrigerant in the oil sump comes out, the oil can be smoothly supplied to the sliding portion, and the oil sump is not always stirred, but the oil sump is stirred only at the start. This also makes it possible to suck up the oil smoothly, and to effectively eliminate the occurrence of wear as a whole.

Furthermore, since no special heater or the like is used, increase in power consumption and increase in failure rate are eliminated.

According to the second aspect of the present invention, in addition to the above, the valve mechanism is made of a spring material having a constant elastic force. Therefore, a portion between the discharge side and the oil sump, which occurs immediately after starting, is formed. By utilizing the pressure difference, the spring member can be deformed against the biasing force thereof, and thereby the communication passage can be opened.

As a result, the communication passage can be opened and closed with a simple structure without using a complicated electrical / mechanical structure, so that the cost can be reduced and the assembling workability can be improved. It will be like this.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a hermetic rotary compressor of the present invention.

FIG. 2 is an enlarged vertical side view of a rotary compression element of a hermetic rotary compressor.

FIG. 3 is an enlarged vertical side view of a rotary compression element of a hermetic rotary compressor according to another embodiment of the present invention.

FIG. 4 is a vertical sectional side view of a conventional hermetic rotary compressor.

[Explanation of symbols]

A rotary compression element C hermetic rotary compressor D electric element 1 closed container 4 rotation axes 4A Eccentric part 5 Upper bearing 6 Lower bearing 7 cylinders 8 oil sump 9 Laura 17 Compression chamber 18 passages 20 coil spring 20A leaf spring 34 valve mechanism 36 open / close valve

Claims (2)

(57) [Claims] 1. A hermetic rotary compressor provided with an electric element housed in a hermetic container and a rotary compression element housed in the hermetic container and driven by a rotation shaft of the electric element. A communication passage that connects the discharge side of the compression element and the oil reservoir in the closed container, and at startup, the communication passage is opened by the pressure difference between the discharge side of the rotary compression element and the oil reservoir , and then the discharge side. And the pressure difference between the oil sump
A hermetic rotary compressor characterized by comprising a valve mechanism that closes a communication path by reduction . 2. The hermetic rotary compressor according to claim 1, wherein the valve mechanism is made of a spring material having a constant elastic force.