JP3018171B2 - Helical liquid ring 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 helical type liquid ring compressor. It can be used for compressors for refrigeration cycles and heat pump cycles, pumps for transporting gases for the chemical industry, and vacuum pumps.

[0002]

2. Description of the Related Art A compressor used in a refrigeration cycle or a heat pump cycle draws in a working medium gas in the form of saturated steam or heated steam, and compresses and discharges it to a high-temperature, high-pressure heated steam.

A conventional compressor for compressing low-pressure steam, such as a steam compressor used in a heat pump cycle, is considerably large and has a complicated structure. Therefore, a liquid ring compressor may be used as a compressor having a simple mechanism. Further, a helical type liquid ring compressor which has been developed from this liquid ring compressor has been devised.

In this liquid ring type compressor, an impeller having spiral helical blades is arranged in a casing and the liquid is sealed. When the impeller is rotated, the sealed liquid adheres to the inner surface of the casing by the action of centrifugal force to form a sealed layer, and forms a void in the center. This space forms an independent compression space for compressing the working gas, and as this compression space goes from the absorption port side to the discharge port side, the volume is gradually reduced, and the working gas is compressed to discharge from the discharge port. I do. As described above, in the helical liquid-ring type compressor, the working space for sucking, compressing, and discharging gas moves axially from the suction port side to the discharge port side, but the liquid sealing for forming the working space is performed. Is also conveyed to the discharge port side at the same time. For this reason, a state where the liquid for sealing the working space is insufficient on the suction port side occurs. In order to satisfy the shortage of the sealing liquid at the suction port side, a method of tilting the entire compressor so that the suction port side is downward and supplying the sealing liquid to the suction port side (1), a supply amount of the sealing liquid from the outside Although the method (2) is already known, the method (1) is a method of returning the sealing liquid through the space between the center of the casing and the impeller eccentric from it, but the sealing liquid is insufficient at the suction port side. Once the return amount due to gravity and the amount due to the pushing action of the impeller are balanced in the state described above, the state of insufficient liquid sealing at the suction port side continues throughout the operation. The method (2) may be able to supply an appropriate amount of sealing liquid, but if it is necessary to supply a certain amount or more of sealing liquid, the power of the pump installed outside will increase significantly. Can be considered.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to surely solve the shortage of the sealing liquid on the suction port side, and also requires a large-scale supply device for the sealing liquid. It is an object of the present invention to provide a helical liquid-ring type compressor having a liquid-supplying mechanism that does not require a liquid supply.

[0006]

In response to this object, a helical type liquid ring compressor according to the present invention has an impeller having helical blades eccentrically arranged in a cylindrical inner casing. has a discharge port of the suction port and the working medium gases of the working medium gases across said inner casing, wherein
In the compressor that uses meet the working liquid into the inner casing, further established the cylindrical outer <br/> casing outside the inner casing, before the side where the discharge port is located
Install a liquid return port near the end of the inner casing,
End of the inner casing on the side where the suction port is located
A sealed liquid suction port near the part,
During the operation of the compressor, the sealed liquid is filled between the inner casings.
It is characterized in that the use <br/> have characterized Rukoto as a passage for returning the working liquid inlet from the sealing fluid return port.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing one embodiment. 1 and 2, reference numeral 1 denotes a helical liquid ring compressor. The helical liquid ring compressor 1 is configured by mounting an impeller 3 inside an inner casing 2 and arranging an outer casing 4 outside the inner casing 2.

The casing 2 has a cylindrical internal space, and has a suction port 5 and a sealed liquid suction port 6 at one end, and a discharge port 7 and a sealed liquid return port 8 at the other end. The impeller 3 is mounted in the inner casing 2 at an eccentric position. Impeller 3
Is composed of a rotor shaft 11 and one or a plurality of blades 12 spirally mounted around the rotor shaft 11. The pitch of the blades 12 is gradually smaller on the discharge port 7 side than on the suction port 5 side.

A sealing liquid 13 is sealed in the inner casing 2. As the sealing liquid 13, a liquid having a lower vapor pressure than the working medium is used.

The outer casing 4 is fixed and houses the inner casing 2 concentrically or eccentrically therein. A gap 14 is formed between the inner casing 2 and the outer casing 4. This gap 14 is a cylindrical gap when the inner casing 2 and the outer casing 4 are arranged concentrically.

The inner casing 2 is fixed or rotatably supported on the outer casing 4. When the inner casing 2 is rotatably supported with respect to the outer casing 4, a bearing (not shown) such as a roller bearing is arranged between the inner casing 2 and the outer casing 4 to rotate the inner casing 2. Support as much as possible. Inner casing 2
A gap 14 between the outer casing 4 and the outer casing 4 forms a passage for the sealed liquid from the sealed liquid return port 8 to the sealed liquid suction port 6.

The operation of compressing steam in the helical liquid ring compressor 1 having the above-described structure is as follows.
The sealing liquid 13 is sealed in the inner casing 2. When the impeller 3 is rotated in this state, the sealing liquid 13 adheres to the inner surface 16 of the inner casing 2 by the action of centrifugal force to form a sealing layer 17. While the thickness of the sealing layer 17 is uniform, the impeller 3
Since the rotor shaft 11 is located eccentrically with respect to the center of the inner casing 2, a space 18 is formed between the lower portion of the rotor shaft 11 and the liquid sealing layer 17. This space 18 is divided in the axial direction by adjacent blades, and forms an independent space. This independent space 18 becomes a compression space 21 for compressing the working gas.

The volume of the compression space 21 is gradually reduced from the suction port 5 to the discharge port 7 to compress the gas. The compression space 21 moves from the suction port side to the discharge port side as the impeller 3 rotates, and is discharged from the discharge port. As the compression space 21 moves in the axial direction of the inner casing 2, the sealing liquid 13 also moves in the axial direction, moves from the suction port 5 side to the discharge port 7 side, and exits with the gas from the discharge port 7 together with the gas. It is again supplied into the inner casing 2 through the cylindrical gap 14 between the inner casing 2 and the outer casing 4.

The liquid is supplied from the suction port 5 side to the vicinity of the impeller 3 by selecting a position where the sealed liquid suction port 6 is provided and as shown in FIGS. 2) a method of flowing from the outer casing of the inner casing as shown in FIG. 3 and FIG.
Although there are various ways, both are effective, and it is also possible to combine both (a) and (b).

As described above, the inner casing 2 may be supported by bearings and may have a rotatable structure. This rotatable structure is known as an existing technology that helps reduce the rotational friction generated between the impeller and the inner casing 2 (Liquid ring rotary pump, by Imari Amari, Power Inc., p. 174, 1984), the sealing liquid
For the return passage, the casing has a cylindrical double structure.
For the first time, introducing existing technology to reduce fluid friction
It becomes possible. The space between the cylinders is sealed from the discharge side to the suction side.
Even when the liquid returns, the inner casing rotates due to the rotation of the inner casing.
Rotational force is also applied to the sealing liquid flowing between the ring and the outer casing.
The sealing liquid supplied on the suction side spreads over the entire circumference of the impeller.
And are evenly supplied.

[0016]

According to the present invention, another casing is provided outside the casing of the liquid ring type compressor having spiral blades,
The space between the inner casing and the outer casing is used as a liquid passage from the discharge side to the suction side. As a result, a sufficient liquid is supplied from the suction port side over the entire circumference of the impeller of the compressor.

In the helical liquid ring type compressor, it is necessary to supply a sufficient amount of liquid to the suction portion, but it is not necessary to supply a large amount of liquid from outside by a liquid pump or the like.

As is apparent from the above description, according to the present invention, a shortage of the sealing liquid at the suction port can be reliably eliminated, and a sealing liquid supply mechanism which does not require a large-scale supply device for the sealing liquid. And a helical liquid ring type compressor having the same.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a helical liquid ring compressor according to the present invention.

FIG. 2 is an explanatory longitudinal sectional view of a helical liquid ring compressor according to the present invention.

FIG. 3 is an explanatory perspective view of another helical liquid ring compressor of the present invention.

FIG. 4 is an explanatory longitudinal sectional view of another helical liquid ring compressor of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Helical liquid-ring type compressor 2 Inner casing 3 Impeller 4 Outer casing 5 Suction port 6 Sealing liquid suction port 7 Discharge port 8 Sealing liquid return port 11 Rotor shaft 12 Blade 13 Sealing liquid 14 Gap 16 Inner surface 17 Sealing layer 18 Vacancies 21 Compressed space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 19/00 F04C 18/00 F04C 18/107 F04C 27/02 F04C 7/00

Claims (2)

(57) [Claims] An impeller having spiral blades has a cylindrical shape.
Be arranged eccentrically in the inner casing has a discharge port of the suction port and the working medium gases of the working medium gases across said inner <br/> casing, use satisfies the working liquid into the inner casing In the compressor, further installing a cylindrical outer casing outside the inner casing,
End of the inner casing on the side where the discharge port is located
A liquid return port is installed near the port, and the suction port is
Liquid inlet near the end of the inner casing on the side to be sealed
Installing the outer casing and the inner casing
During the operation of the compressor, the sealed liquid is transferred from the sealed liquid return port to the front.
Kifu liquid <br/> helical form Liquid Ring compressor, wherein Rukoto used as a passage for returning to the suction port. 2. The inner casing has a structure rotatable around a rotation axis parallel to a rotation axis of the impeller in the outer casing, and the sealed liquid flows from the sealed liquid return port to the sealed liquid suction port. 2. The helical liquid ring compressor according to claim 1, wherein a rotational force in the same direction as that of the impeller can be applied to the liquid seal while moving.