JP3270499B2 - Compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used for refrigeration and air conditioning.

[0002]

2. Description of the Related Art Conventionally, '90 -91 issued in May 1990.
A plurality of compressors connected in parallel shown on page 379 of the National Air Conditioning Equipment Data Book, Package Type Air Conditioner II are generally those shown in FIGS.

Hereinafter, the conventional compressor will be described with reference to this drawing. Note that, for ease of explanation, arrows indicating the flow directions of the refrigerant gas are inserted. FIG. 7 shows a sectional view of a conventional compressor. FIG. 8 is a cross-sectional view of a conventional compressor in which one of the compressor units is operating and the other is stopped.

[0004] In Figs. 7 and 8, reference numerals 1a and 1b denote compressor units, in which compression elements 3a and 3b and electric elements 4a and 4b are housed in hollow cylindrical closed containers 2a and 2b. Reference numerals 5a and 5b denote oil supply pipes of the compressor units 1a and 1b, which extend to the bottom surfaces of the sealed containers 2a and 2b. Reference numeral 6 denotes refrigerating machine oil, which is provided in the closed containers 2a and 2b, and the leading ends of the oil supply pipes 5a and 5b are buried. The compressor units 1a and 1b are connected in parallel by an equalizing pipe 7 and an oil equalizing pipe 8.

[0005] Regarding the compressor configured as described above,
The operation will be described below according to the flow of the refrigerant gas. The low-temperature and low-pressure refrigerant gas is guided from the suction pipes 9a and 9b and reaches the compression elements 3a and 3b. Here, the refrigerant gas passes through the compression process and becomes a high-temperature and high-pressure gas.
a and 10b. The discharged refrigerant gas is supplied to a discharge chamber 11a, which is an upper space in the closed containers 2a and 2b.
11b and the electric element 4 via the communication passages 12a and 12b.
a, 4b, and is led to the refrigerator system via the discharge pipes 13a, 13b.

Next, the flow of the refrigerating machine oil 6 will be described.
The refrigerating machine oil 6 stored at the bottoms of the sealed containers 2a, 2b passes through oil supply pipes 5a, 5b and is supplied to the electric elements 4a, 4b and the compression elements 3a, 3b. Further, a part thereof is taken out through the discharge pipes 13a and 13b by the refrigerant gas and circulates in the refrigerator system, and then, together with the refrigerant gas, the suction pipe 9a.
return to the compressor units 1a, 1b via
It is stored again at the bottom of the sealed containers 2a and 2b.

In such a configuration, when the compressor unit 1a is operating and the compressor unit 1b is stopped by controlling the capacity, etc., the refrigerant oil 6 circulating in the refrigerating system is controlled. Returns only to the operating compressor unit 1a via the suction pipe 9a, so that the operating compressor unit 1a and the stopped compressor unit 1b have an oil level of the refrigerant oil 6. Since there is a difference in height, the oil level is equalized through the oil leveling pipe 8.

In the state where the compressor unit 1a is operating and the compressor unit 1b is stopped, 1a
Since the pressures inside the compressor unit 1b and the unit 1b are different, the refrigerating machine oil 6 flows from the compressor unit 1a having a high pressure to the compressor unit 1b having a low pressure via the oil equalizing pipe 8. To prevent this, the pressure equalizing pipe 7
Is used to equalize the pressure.

[0009]

However, in the above-described conventional configuration, when one compressor unit is operating and the other compressor unit is stopped by controlling the capacity or the like, the operating compressor is not operated. As the oil supply pipe that rotates with the electric element of the unit rotates, and the rotation causes a flow in the same direction in the refrigerating machine oil, as shown in Bernoulli's theorem, outside the rotation axis, here the side of the sealed container The pressure of the refrigerating machine oil increases, which causes the refrigerating machine oil to flow into the stopped compressor unit via the oil equalizing pipe, and the oil level near the oil supply pipe of the operating compressor unit drops, causing poor refueling. Had disadvantages.

A part of the refrigerant gas discharged from the discharge hole of the operating compressor unit is guided into the stopped compressor unit via the pressure equalizing pipe, and the discharge chamber and the communication passage are communicated with each other. Via the discharge pipe to the refrigerator system. At this time, the refrigerating machine oil flows into the stopped compressor unit from the operating compressor unit, and the oil level in the stopped compressor unit has risen significantly. A large amount of gas was taken out to the refrigerator system by the gas, and as a result, there was also a disadvantage that refrigerator oil in the compressor unit was reduced.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a compressor having high reliability of refueling.

[0012]

In order to achieve the above object, a compressor of the present invention extends from a compression element, an electric element, a refrigerating machine oil, and a compression element in a hollow cylindrical closed container and is immersed in the refrigerating machine oil. A plurality of compressor units having an oil supply pipe, a pressure equalizing pipe communicating the plurality of compressor units at an upper part, and a plurality of compressor units communicating at a lower part, and further to near the center of the closed container. It has a configuration with an extended oil equalizing pipe.

Another compressor of the present invention has, in addition to the structure of the present invention, an oil equalizing pipe having an opening in a direction opposite to the rotation direction of the oil supply pipe.

Further, another compressor according to the present invention includes a plurality of oil supply pipes extending from a compression element, an electric element, a refrigerating machine oil, and a compression element and immersed in the refrigerating machine oil in a hollow cylindrical hermetic container. A compressor unit, a pressure equalizing pipe communicating with the plurality of compressor units at the upper part, an oil equalizing pipe communicating with the plurality of compressor units at the lower part, and a portion near the center of the hermetic container at the bottom of the compressor unit. And a plurality of radially mounted resistance plates.

[0015]

In the compressor of the present invention, since the oil equalizing pipe extends to the vicinity of the center of the closed vessel, the opening of the oil equalizing pipe is influenced by the pressure generated by the flow of the refrigerating machine oil in the same rotational direction as the oil supply pipe rotates. It is located where it does not receive. Therefore, it is possible to prevent the refrigerating machine oil from flowing into the stopped compressor unit. As a result, it is possible to prevent the refrigerating machine oil from being taken out to the refrigerating system due to an increase in the level of the refrigerating machine oil.

Further, since the compressor of the present invention further includes the oil equalizing pipe having an opening in a direction opposite to the rotation direction of the oil supply pipe, the dynamic pressure generated by the flow of the refrigerating machine oil accompanying the rotation of the oil supply pipe. Refrigeration oil can be equalized without being affected by the temperature.

Further, since the compressor of the present invention has a plurality of resistance plates radially attached from the vicinity of the center of the hermetic container at the bottom of the compressor unit, the compressor obstructs the flow of the refrigerating machine oil, and the hermetic seal is thereby prevented. By preventing the pressure on the side of the container from increasing, it is possible to prevent the refrigerating machine oil from flowing into the stopped compressor unit. As a result, it is possible to prevent the refrigerating machine oil from being taken out to the refrigerating system due to an increase in the level of the refrigerating machine oil.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the 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.

FIG. 1 is a sectional view of a compressor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the compressor of the embodiment when one of the compressor units is operating and the other is stopped. In FIG. 1 and FIG. 2, reference numeral 14 denotes an oil equalizing pipe which communicates the compressor units 1a and 1b at the lower part and further extends to near the center of the closed containers 2a and 2b.

Regarding the compressor configured as described above,
The operation when the compressor unit 1a is operating and the compressor unit 1b is stopped during the capacity control will be described below. The refrigerating machine oil 6 stored in the bottoms of the sealed containers 2a and 2b flows in the same rotational direction as the oil supply pipe 5a interlocked with the electric element 4a of the operating compressor unit 1a rotates. Yields
As shown in Bernoulli's theorem, the pressure of the refrigerating machine oil 6 on the side of the closed container 2a increases, but since the oil equalizing pipe 14 is extended to near the center of the closed container 2a, the oil equalizing pipe 14
The pressure at the opening of the refrigeration oil 6 is low, and
4 to prevent the compressor unit 1b from flowing into the stopped compressor unit 1b.
Can be measured.

Further, by equalizing the refrigerating machine oil 6 of the compressor units 1a and 1b, the rise of the oil level of the refrigerating machine oil 6 in the compressor unit 1b is suppressed, whereby the operation is performed. Discharge hole 10 of compressor unit 1a
a part of the refrigerant gas discharged from the discharge chamber 1a is guided into the stopped compressor unit 1b through the pressure equalizing pipe 7,
1b and the communication passage 12b to fill the electric element 4b and prevent a large amount of the refrigerating machine oil 6 from being taken out to the refrigerating system caused by being guided to the refrigerating system via the discharge pipe 13b. A certain amount of refrigeration oil 6 can be kept in 1b.

Next, a second embodiment of the compressor according to the present invention will be described with reference to the drawings. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIGS. 3 and 4 are sectional views of a compressor according to a second embodiment of the present invention. 3 and 4, reference numeral 15 denotes an opening 15a, 1 in the direction opposite to the rotation direction of the oil supply pipes 5a, 5b.
5b is an oil equalizing pipe.

With respect to the compressor configured as described above,
The operation will be described below. The refrigerating machine oil 6 stored at the bottom in the closed containers 2a and 2b is supplied to the electric elements 4a and 4b.
The rotation of the oil supply pipes 5a and 5b causes a flow in the same rotational direction in accordance with the rotation, and a dynamic pressure is generated by the flow in the same direction.
Since the oil equalizing pipe 15 having the a and 15b is provided, the refrigerating machine oil 6 of the compressor units 1a and 1b can be made uniform without being affected by the dynamic pressure.

Next, a third embodiment of the compressor according to the present invention will be described 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.

FIGS. 5 and 6 are sectional views of a compressor according to a third embodiment of the present invention. 5 and 6, 16a,
Reference numeral 16b denotes a resistance plate mounted radially from the vicinity of the center of the sealed containers 2a, 2b at the bottoms of the compressor units 1a, 1b.

With respect to the compressor configured as described above,
The operation will be described below. The refrigerating machine oil 6 stored at the bottom in the closed containers 2a and 2b is supplied to the electric elements 4a and 4b.
As the oil supply pipes 5a and 5b rotate in conjunction with the rotation, a flow in the same rotational direction occurs with the rotation.
The flow of the compressor units 1a and 1b can be made uniform by preventing the increase in pressure on the side surfaces of the closed containers 2a and 2b due to the presence of the flow passages a and 16b.

[0028]

As described above, the present invention provides a plurality of oil-supply pipes each having a compression element, an electric element, refrigeration oil, and an oil supply pipe extending from the compression element and immersed in the refrigeration oil in a hollow cylindrical closed container. A compressor unit, a pressure equalizing pipe communicating the plurality of compressor units at an upper part, and an oil equalizing pipe communicating the plurality of compressor units at a lower part and further extending to near the center of the closed vessel; Therefore, it is possible to prevent the refrigerating machine oil from flowing into the stopped compressor unit. As a result, it is possible to prevent the refrigerating machine oil from being taken out to the refrigerating system due to an increase in the level of the refrigerating machine oil.

Further, since the compressor is composed of the oil equalizing pipe having an opening in the direction opposite to the rotation direction of the oil supply pipe, the compressor is affected by the dynamic pressure generated by the flow of the refrigerating machine oil accompanying the rotation of the oil supply pipe. Without refrigerating machine oil, equalization can be achieved.

The present invention also provides a plurality of compressor units including a compression element, an electric element, a refrigerating machine oil, and an oil supply pipe extending from the compression element and immersed in the refrigerating machine oil in a hollow cylindrical closed container. An equalizing pipe communicating the plurality of compressor units at the upper part, an oil equalizing pipe communicating the plurality of compressor units at the lower part, and radially attached from the vicinity of the center of the sealed container at the bottom of the compressor unit. Since the compressor is composed of a plurality of resistance plates, the flow of the refrigerating machine oil is obstructed and the pressure on the side of the sealed container is prevented from increasing, thereby preventing the refrigerating machine oil from flowing into the stopped compressor unit. can do. As a result, it is possible to prevent the refrigerating machine oil from being taken out to the refrigerating system due to an increase in the level of the refrigerating machine oil.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the compressor of the embodiment when one of the compressor units is operating and the other is stopped.

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

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view of a third embodiment of the compressor according to the present invention.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a sectional view of a conventional compressor.

FIG. 8 shows one compressor unit of the conventional compressor operating;
Sectional view when the other compressor unit is stopped

[Explanation of symbols]

 1a, 1b Compressor unit 2a, 2b Closed vessel 3a, 3b Compression element 4a, 4b Electric element 5a, 5b Oil supply pipe 6 Refrigerator oil 7 Equalizing pipe 14 Equalizing pipe 15 Equalizing pipe 15a, 15b Opening 16a, 16b Resistance plate

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 41/06 F04B 39/02 F04C 23/00 F04C 29/02 321

Claims (3)

(57) [Claims] 1. A plurality of compressor units each including a compression element, an electric element, a refrigerating machine oil, and an oil supply pipe extending from the compression element and immersed in the refrigerating machine oil, in a hollow cylindrical closed container, and the plurality of compression units. A compressor comprising: a pressure equalizing pipe communicating with a compressor unit at an upper portion; and an oil equalizing tube communicating with the plurality of compressor units at a lower portion and further extending to near the center of the closed vessel. 2. The compressor according to claim 1, further comprising an oil equalizing pipe having an opening in a direction opposite to a rotation direction of the oil supply pipe. 3. A plurality of compressor units each including a compression element, an electric element, a refrigerating machine oil, and an oil supply pipe extending from the compression element and immersed in the refrigerating machine oil, in a hollow cylindrical closed container, and the plurality of compression units. A pressure equalizing pipe communicating the compressor unit at the upper part, an oil equalizing pipe communicating the plurality of compressor units at the lower part, and a plurality of resistance plates radially attached from the vicinity of the center of the closed container at the bottom of the compressor unit. And a compressor equipped with.