JPH10281088A - Sealed type electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make liquid coolant difficult to be sucked from a suction opening part of an oil feeding mechanism by providing a shelf part which is higher than the bottom part of a sealed container in the lower direction of the suction opening of the oil feeding mechanism. SOLUTION: A shelf part 7 which is higher than the bottom part of a sealed container 1 is provided in the lower direction of a suction opening of an oil feeding pipe 14 supplying ice machine oil to a compression element 2. The length of the oil feeding pipe 14 is shortened so as not to interfere with the shelf part 7. Because compatibility of HFC system coolant and mineral oil or alkylbenzene ice machine oil is not good by this constitution, liquid coolant is reduced near the suction opening part of the oil feeding pipe 14 because the shelf part 7 pushes its way through a liquid coolant layer 6 even in a state that liquid coolant is condensed and stays on the lower side of an ice machine oil layer 5 according to pressure within the sealed container 1 and a temperature condition. When drops of liquid coolant condensed is generated around a suction pipe of a compressor, the liquid coolant becomes difficult to be sucked from the suction opening part of the oil feeding pipe 14 by an action that liquid coolant does not stay near the lower part of the suction opening part of the oil feeding pipe 14 by the shelf part 7 even if the liquid coolant drops down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for refueling a hermetic electric compressor.

[0002]

2. Description of the Related Art In recent years, HFC-based refrigerants (R134a, R407C, R404a) which do not contain chlorine from the viewpoint of environmental friendliness.
Etc.) are becoming mainstream.

Conventionally, hermetic electric compressors are disclosed in
One described in Japanese Patent No. 05587 is known.

FIGS. 7, 8 and 9 show the structure of a conventional hermetic electric compressor, in which 1 is a closed container, 2 is a compression element, 3 is an electric element for driving the compression element 2, and 4 is a compression element. An oil supply pipe for supplying refrigeration oil to the element 2.

[0005] In the compressor configured as described above,
Simultaneously with the start of the compressor, the refrigerating machine oil in the closed casing 1 is sucked from the suction opening of the oil supply pipe 4 and the oil supply to each sliding portion of the compression element 2 is started.

[0006]

However, in the conventional structure described above, in a compressor using an HFC-based refrigerant and a mineral oil or an alkylbenzene-based refrigeration oil, the compatibility between the refrigerant and the refrigeration oil is not good. Depending on the pressure and temperature conditions in the closed vessel 1, the liquid refrigerant is condensed and retained below the refrigerating machine oil tank, and the suction opening of the oil supply pipe 4 is immersed in the condensed and retained liquid refrigerant layer 6. State, the liquid refrigerant is sucked almost continuously from the suction opening of the oil supply pipe,
This state continues until the height of the liquid refrigerant layer 6 becomes lower than the suction opening of the oil supply pipe 4, and thereafter, the liquid refrigerant near the lower part of the suction opening of the oil supply pipe 4 is intermittently sucked. When the liquid refrigerant condensed in a droplet form around the suction pipe of the compressor, the liquid refrigerant drops and accumulates near the lower part of the suction opening of the oil supply pipe 4, so that the suction opening of the oil supply pipe 4 is formed. Therefore, there is a problem that the liquid refrigerant is intermittently sucked and the refrigerating machine oil is hardly supplied to each sliding portion, and the reliability of each sliding portion against wear is reduced.

An object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to make it difficult for liquid refrigerant condensed and retained to be sucked from a suction opening of an oil supply pipe 4.

[0008]

According to the present invention, a shelf higher than the bottom of the closed container is provided below the suction opening of the oil supply mechanism.

[0009] With this arrangement, the shelves separate the liquid refrigerant layer, so that the amount of the liquid refrigerant is reduced near the suction opening of the refueling mechanism.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is such that a shelf higher than the bottom of a closed container is provided below a suction opening of a refueling mechanism, and the shelf forms a liquid refrigerant layer. Separation has the effect of reducing the amount of liquid refrigerant near the suction opening of the refueling mechanism.

According to a second aspect of the present invention, the shelf is formed integrally with the bottom of the closed container by press working. In addition to the same effect as the first aspect of the present invention, the shelf and the closed container are formed. Can be integrated.

According to a third aspect of the present invention, the shelf has a cap-like shape. In addition to the same operation as the first aspect, the suction opening of the refueling mechanism has a cap-like rib. Has the effect of suppressing the liquid refrigerant around the shelf from being caught in the suction opening of the refueling mechanism.

According to a fourth aspect of the present invention, a heater is provided outside the closed vessel so that the height of the liquid refrigerant layer in the closed vessel is equal to or less than the height of the shelf. By separating the layers and controlling the heater so that the top surface of the shelf enters the layer of refrigerating machine oil, the effect that the amount of liquid refrigerant near the suction opening of the refueling mechanism is stably reduced. Have.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIGS. 1, 2 and 3 show a first embodiment.
1 shows a hermetic electric compressor according to one embodiment of the invention described. In this embodiment, a shelf 7 higher than the bottom of the closed container is provided below the suction opening of the oil supply pipe 14 for supplying the refrigerating machine oil to the compression element 2, and the oil supply pipe 14 is conventionally provided so as not to interfere with the shelf 7. The length of the tube is shorter than that of.

With the above configuration, in the compressor using the HFC-based refrigerant and the refrigerating machine oil of mineral oil or alkylbenzene, the compatibility between the refrigerant and the refrigerating machine oil is not good, so that the pressure in the closed vessel 1 and the Depending on the temperature condition, even when the liquid refrigerant is condensed and retained below the refrigerator oil layer 5, the shelves 7 separate the liquid refrigerant layer 6 so as to be close to the suction opening of the oil supply pipe 14. The liquid refrigerant is reduced, and, if liquid refrigerant condensed in a droplet around the suction pipe of the compressor is generated, even if the liquid refrigerant drops,
The effect that the shelf 7 does not accumulate near the lower portion of the suction opening of the oil supply pipe 14 has the effect of making it difficult for the liquid refrigerant to be sucked from the suction opening of the oil supply pipe 14,
Since the refrigerating machine oil can be supplied to the compression element 2, an oil film is easily formed on each sliding portion of the compression element 2, thereby improving the durability of the compressor.

(Embodiment 2) FIG. 4 is a sectional view of a main part of a hermetic electric compressor according to one embodiment of the present invention. In the present embodiment, the shelf shown in Embodiment 1 is press-worked. Thereby, it is formed integrally with the bottom of the closed container 2.

With the above configuration, in addition to the same operation and effect as in the first embodiment, the shelf 17 and the closed container can be integrated, and the effect of reducing the cost can be obtained.

(Embodiment 3) FIG. 5 is a sectional view of a main part of a hermetic electric compressor according to a third embodiment of the present invention. In this embodiment, the shelf has a cap-like shape. I have.

With the above configuration, in addition to the same operation and effect as in the first embodiment, the suction opening of the oil supply pipe 14 is surrounded by the cap-shaped rib, so that the liquid refrigerant around the shelf 27 can be removed. The phenomenon that the oil supply pipe 14 is caught in the suction opening of the oil supply mechanism can be avoided, and the effect that the refrigerating machine oil can be more reliably sucked can be obtained. (Embodiment 4) FIG. 6 is a refrigeration cycle diagram according to one embodiment of the present invention, wherein 8 is a heater provided outside the closed vessel, 9 is a condenser, 10 is a throttle, and 11 is evaporation. A refrigerating cycle formed by a compressor provided with a shelf higher than the bottom of the closed vessel below the suction opening of the oil supply pipe according to claim 1 or 2 or 3.

With the above structure, when the height of the liquid refrigerant layer 6 is higher than that of the shelf according to the first or second or third aspect under conditions such as low outside air temperature, the liquid refrigerant layer is heated by the heater 8. By controlling the height of the shelf 6 to be equal to or less than the height of the shelf, the top surface of the shelf enters the refrigerating machine oil layer 5, and stabilizes the liquid refrigerant near the suction opening of the oil supply pipe 14. Due to the effect that it can be reduced, the liquid refrigerant is less likely to be sucked from the suction opening of the oil supply pipe 14, and a more durable refrigeration cycle can be obtained.

[0022]

As is apparent from the above embodiment, according to the first aspect of the present invention, in the hermetic electric compressor using an HFC-based refrigerant and a mineral oil or an alkylbenzene-based refrigerating machine oil, By providing a shelf higher than the bottom of the closed container below the suction opening of the oil supply mechanism of the compressor, the advantageous effect that the liquid refrigerant is less likely to be sucked from the suction opening of the oil supply mechanism is obtained.

According to the second aspect of the present invention, HF
In a hermetic electric compressor in which a C-based refrigerant and a mineral oil or an alkylbenzene-based refrigerating machine oil are used, a shelf higher than the bottom of the hermetic container is provided below a suction opening of the compressor, and the shelf is By being formed integrally with the bottom of the closed container by press working, it is advantageous that liquid refrigerant is not easily sucked from the suction opening of the oil supply mechanism, and the cost is reduced by integrating the shelf and the closed container. The effect is obtained.

According to the third aspect of the present invention, HF
In a hermetic electric compressor in which a C-based refrigerant and a mineral oil or an alkylbenzene-based refrigerating machine oil are used, a shelf higher than the bottom of the hermetic container is provided below a suction opening of the compressor, and the shelf is With the cap-like shape, the suction opening of the refueling mechanism is surrounded by the cap-like ribs, so that an advantageous effect of suppressing suction of the liquid refrigerant around the shelf can be obtained.

According to the fourth aspect of the present invention, at least a condenser, a throttle, and an evaporator are provided.
A refrigerating apparatus provided with a heater outside the hermetic container so that the height of the liquid refrigerant condensed and retained in the hermetic container is equal to or less than the height of the shelf portion, thereby providing an HFC-based refrigerant. And when using a mineral oil or an alkylbenzene-based refrigerating machine oil, even if the height of the liquid refrigerant layer is higher than the shelf according to claim 1 or 2 or 3 under conditions such as low outside air temperature, By heating the compressor, the amount of staying liquid refrigerant can be reduced, and by setting the calorific value of the heater such that the height of the liquid refrigerant layer is equal to or less than the height of the shelf, the ceiling of the shelf can be cooled. The surface enters the refrigerating machine oil layer, and the liquid refrigerant near the suction opening of the refueling mechanism is not stabilized, so that an advantageous effect that almost no liquid refrigerant is sucked from the suction opening of the refueling mechanism can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention described in claim 1;

FIG. 2 is an enlarged sectional view of a portion B in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III ′ of FIG. 1;

FIG. 4 is a sectional view of an essential part of a hermetic electric compressor according to a second embodiment of the present invention described in claim 2;

FIG. 5 is a sectional view of an essential part of a hermetic electric compressor according to a third embodiment of the present invention described in claim 3;

FIG. 6 is a refrigeration cycle diagram according to a fourth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a conventional hermetic electric compressor.

8 is an enlarged sectional view of a portion A in FIG. 7;

9 is a sectional view taken along line IX-IX 'of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression element 3 Electric element 5 Refrigerator oil layer 6 Liquid refrigerant layer 7 Shelf 8 Heater 9 Condenser 10 Restrictor 11 Evaporator 14 Oil supply pipe 17 Shelf 27 Shelf

Claims (4)

[Claims] 1. A compression element in a closed container using an HFC-based refrigerant and a mineral oil or an alkylbenzene-based refrigerating machine oil,
A hermetic electric compressor including an electric element for driving the compressor, an oil supply mechanism for supplying refrigerating machine oil to the compression element, and a shelf higher than the bottom of the hermetic container below a suction opening thereof. . 2. The hermetic electric compressor according to claim 1, wherein the shelf is formed integrally with the bottom of the closed vessel by press working. 3. The shelf according to claim 1, wherein said shelf has a cap-like shape.
The hermetic electric compressor as described. 4. A liquid refrigerant having at least a condenser, a throttle, and an evaporator, and the compressor according to claim 1 or 2, wherein the height of the liquid refrigerant condensed and retained in the closed vessel is equal to or less than the height of the shelf. A refrigeration system that has a heater outside the closed container so that