JP3541220B2 - Helical liquid ring compressor - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a liquid ring compressor, particularly to a helical liquid ring compressor, including a refrigeration cycle and a heat pump, and can be used as a general compressor, a blower and a vacuum pump, and can be used in a chemical industry, a machine industry, It can be applied to many industries such as food industry, agriculture, forestry and fisheries.
[0002]
[Prior art]
A conventional helical liquid-ring type compressor has an impeller having spiral blades in a cylindrical casing, as described in, for example, Japanese Patent Application Laid-Open No. 50-124209, and the liquid is sealed. Has been injected. When the impeller is rotated by the driving device, the sealing liquid adheres to the inner surface of the casing by the action of centrifugal force to form a sealing liquid, and the impeller boss surface, the sealing surface and Form a void surrounded by the blade surface. This space forms an isolated compression space for compressing the gas, and the volume gradually decreases as the compression space moves from the suction side to the discharge side to compress the working gas and discharge it from the discharge side.
[0003]
On the other hand, in a typical liquid-sealed compressor, the blades are mounted parallel to the shaft and have a shape inclined in the rotation direction, so that the casing and the impeller are farthest from the position where the blade comes closest to the casing and the impeller. In the process of rotating to the position, that is, in the process in which the blade gradually escapes from the boss surface from the sealing liquid, the sealing liquid is easily released in the radial direction from the boss surface, and conversely, the blade is most likely to be the casing and the impeller. In the process of rotating from the distant position to the position where the casing and the impeller come closest to each other, that is, in the process of sinking the blade in the sealing liquid, it is easy to store the sealing liquid in the direction of the root of the blade.
[0004]
[Problems to be solved by the invention]
However, in the conventional helical liquid ring compressor described above, the blade surface is inclined with respect to the axis of the impeller due to the spiral shape of the blade, and the sealed liquid flows out to the discharge side along the blade surface. I do. At this time, since the liquid is more likely to flow out in the circumferential direction having less resistance than in the radial direction, the efficiency of storing the sealed liquid in the blade is reduced. Therefore, the efficiency of storing the sealing liquid in the blade and releasing the sealing liquid from the blade becomes poor.
In particular, if the impregnation capacity of the impeller is poor, the seal liquid may separate from the boss surface at the closest point between the impeller and the casing. Performance is significantly reduced.
[0005]
Conventionally, at a position where the impeller and the casing are closest to each other, as a technique for preventing the sealing liquid from separating from the boss surface,
(1) The supply pressure of the sealing liquid supplied into the casing of the compressor is increased.
(2) The device is tilted so that the discharge portion is directed upward with the suction portion of the compressor downward, and the static pressure of the sealed liquid on the suction side is increased by gravity acting on the sealed liquid.
It is known.
However, these methods could not completely prevent the sealing liquid from separating from the boss surface.
[0006]
The present invention has been proposed in order to solve such problems of the conventional technology.The present invention has been proposed to improve the storage performance of a sealing liquid in a compression space, and to seal the boss surface at the closest point between the impeller and the casing. It is an object of the present invention to provide a helical type liquid ring compressor in which a phenomenon that liquid is separated is prevented, a sealing of a compression space is completed, and performance as a compressor is improved.
[0007]
[Means for Solving the Problems]
In order to achieve this object, a helical type liquid ring compressor according to the present invention is provided with an eccentrically provided impeller having a helical blade forming a part of a partition of a working space in a casing, and the casing is provided with a seal. In a helical liquid-ring type compressor in which a sealing liquid is supplied and a driving device rotates and operates an impeller, a shape assist that gives a component force for moving the sealing liquid in a root direction of the blade is provided. One or more blades are provided so as to fit between both ends of the boss of the impeller.
[0008]
The helical liquid ring compressor according to the present invention is characterized in that the auxiliary wings are provided continuously in the axial direction of the impeller.
Further, the helical type liquid ring compressor according to the present invention is characterized in that the auxiliary wing is provided intermittently in the axial direction of the impeller.
Also, the helical liquid ring compressor according to the present invention is characterized in that the auxiliary wing is provided in parallel with the axis of the impeller.
Further, the helical liquid ring compressor according to the present invention is characterized in that the auxiliary wing is provided non-parallel to the axis of the impeller.
The helical liquid ring compressor according to the present invention is characterized in that the auxiliary wing has a streamlined cross section.
The helical liquid ring compressor according to the present invention is characterized in that the surface of the auxiliary wing is subjected to a low friction treatment.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a helical liquid ring compressor according to the present invention will be described with reference to the drawings.
In FIG. 1, a helical liquid ring compressor 1 is configured by eccentrically disposing an impeller 3 in a cylindrical casing 2.
FIG. 2 shows an impeller 3 disposed in the casing 2. The impeller 3 is a cylindrical boss 4 fitted on a driving rotary shaft 7 and a spiral mounted on the surface of the boss 4. It is composed of blades 5 in the shape of a letter.
[0010]
Further, the auxiliary wing 6 has a length in the axial direction with respect to the blade 5 of the impeller 3, does not contact the surface of the boss 4, and has a cross-sectional shape inclined toward the rotation direction 8. It is provided to fit between both ends. The center line of the auxiliary wing 6 is provided parallel or non-parallel (substantially parallel) to the axis of the impeller 3.
The auxiliary wing 6 is provided so as not to participate in the formation of the working space 20 as shown in FIG.
[0011]
The examples shown in FIGS. 1, 2 and 3 show a case where there are four spiral blades 5 and four auxiliary wings 6, but the number of auxiliary wings 6 may be one or more.
In addition, in order to reduce the fluid resistance of the auxiliary wing 6, it is desirable to make the cross section of the auxiliary wing 6 streamlined, or to perform a known friction reduction process on the surface of the auxiliary wing 6.
Further, in the example shown in the drawing, the diameter of the boss 4 of the impeller 3 is made the same in the axial direction, and the spiral pitch of the blade 5 is adjusted from the side of the suction port 9 disposed at one end of the casing 2 to the casing 2. The diameter of the wings of the impeller is changed in the axial direction, and the pitch of the spiral blades is made uniform in the axial direction. The present invention is also applicable to a helical type liquid ring type compressor in which the diameter of a boss of an impeller is changed in an axial direction and a pitch of a spiral blade is changed in an axial direction. .
[0012]
A suction chamber 11 and a discharge chamber 12 are provided outside the suction port 9 and the discharge port 10, respectively. A suction pipe 13 and a discharge pipe 14 are connected to each other. The suction chamber 11 and the discharge chamber 12 are provided with a bearing device 15 and a shaft sealing device 16.
A sealing liquid 17 is sealed in the casing 2, and a liquid having a lower vapor pressure than the gas to be compressed is used as the sealing liquid 17.
[0013]
The operation of compressing gas in the helical liquid-ring type compressor 1 configured as described above is as follows.
When the impeller 3 is rotated in the rotation direction 8 in a state where the sealing liquid 17 is sealed in the casing 2, the sealing liquid 17 adheres to the inner surface 18 of the casing 2 by the action of the centrifugal force, and the liquid seal 19 is formed. Form. While the thickness of the sealing liquid 19 is substantially uniform in the circumferential direction, the impeller 3 is located at an eccentric position with respect to the center of the casing 2. A space 20 is formed in the space.
[0014]
This space 20 is separated in the axial direction by the adjacent blades 5 to form an independent space. This space 20 is used as a working space 20 for compression.
The working space 20 moves from the suction port 9 side to the discharge port 10 side as the impeller 3 rotates, compresses the gas by gradually reducing its volume, and discharges the gas from the discharge port 10.
[0015]
To perform such a series of operations, as shown in FIG. 3, at a position 21 where the casing 2 and the impeller 3 are closest, the liquid seal 19 is brought into contact with the surface of the boss 4 of the impeller 3 by the sealing liquid 17. It is essential that they exist.
In the present invention, as described above, the auxiliary wing 6 has a length in the axial direction with respect to the blade 5 of the impeller 3, does not contact the surface of the boss 4, and is inclined in the rotation direction 8. Since the auxiliary wing 6 having the shape is provided, the sealing liquid 17 receives a component force in the root direction of the blade on the plane orthogonal to the rotation axis by the auxiliary wing 6.
[0016]
At this time, the auxiliary wing 6 is installed so that the center line of the cross section thereof is parallel or almost parallel to the rotation axis 7 of the impeller 3, so that the liquid flowing along the surface of the auxiliary wing 6 is axially Hardly imparts the power of As a result, the force in the radial direction toward the boss 4 surface is not reduced.
Therefore, when the auxiliary wing 6 is located at a position between the position 22 where the casing 2 and the impeller 3 are farthest away from each other and the position 21 where the casing 2 and the impeller 3 are closest, the sealing liquid 17 is applied to the root of the blade 5. Or the direction of the surface of the boss 4 so that the sealing liquid 17 comes into contact with the surface of the boss 4 of the impeller 3 at the position 21 where the casing 2 and the impeller 3 are closest.
[0017]
Further, between a position 21 where the casing 2 and the impeller 3 are closest to each other and a position 22 where the casing 2 and the impeller 3 are farthest apart, the sealing liquid 17 is centrifuged in the radial direction, that is, from the root of the blade 5 to the tip of the blade 5. Although released by force, the auxiliary wing 6 does not hinder the movement of the liquid sealing 17 because the auxiliary wing 6 has a cross-sectional shape inclined toward the rotation direction 8.
[0018]
【The invention's effect】
As described above, according to the present invention, an impeller having spiral blades forming a part of a partition of a working space is eccentrically provided in a casing, and a sealing liquid serving as a seal is supplied to the casing. In a helical liquid-ring type compressor in which an impeller is rotated and operated by a driving device, the impeller is provided with a single auxiliary wing or an auxiliary wing having a shape that gives a component force to the sealing liquid to move in the root direction of the blade. By providing a plurality of sheets, it is possible to easily discharge the sealing liquid from the impeller root and to store the sealing liquid in the impeller root, and to achieve a special effect that a stable liquid seal can be formed at each position.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a helical liquid ring compressor according to the present invention.
FIG. 2 is an explanatory view of an impeller of a helical liquid ring compressor according to the present invention.
FIG. 3 is a cross-sectional view of a helical liquid ring compressor according to the present invention.
FIG. 4 is an explanatory view of an impeller of a conventional helical liquid ring compressor.
FIG. 5 is a cross-sectional view of a conventional helical liquid ring compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Helical liquid-ring type compressor 2 Casing 3 Impeller 4 Boss 5 Blade 6 Auxiliary wing 7 Rotating shaft 8 Rotation direction 9 Suction port 10 Discharge port 11 Suction chamber 12 Discharge chamber 13 Suction pipe 14 Discharge pipe 15 Bearing device 16 Shaft seal Device 17 Seal liquid 18 Casing inner surface 19 Liquid seal 20 Vacancy (working space)
21 Position where the casing and the impeller are closest 22 Position where the casing and the impeller are farthest

Claims (7)

An impeller having helical blades forming a part of a partition of the working space is eccentrically provided in a casing, a sealing liquid serving as a seal is supplied to the casing, and the impeller is rotated and operated by a driving device. In the helical liquid-ring type compressor, a single or plural sheets of auxiliary wings are provided between the boss ends of the impeller, so that the auxiliary wings are shaped to give a component force for moving the sealing liquid in the root direction of the blades. A helical type liquid ring compressor characterized by being provided. The helical type liquid ring compressor according to claim 1, wherein the auxiliary wings are provided continuously in the axial direction of the impeller. 2. The helical type liquid ring compressor according to claim 1, wherein the auxiliary wing is provided intermittently in the axial direction of the impeller. The helical type liquid ring compressor according to any one of claims 1 to 3, wherein the auxiliary wing is provided in parallel with the axis of the impeller. The helical liquid ring compressor according to any one of claims 1 to 3, wherein the auxiliary wing is provided non-parallel to the axis of the impeller. The helical type liquid ring compressor according to any one of claims 1 to 5, wherein a cross-sectional shape of the auxiliary wing is streamlined. The helical liquid ring compressor according to any one of claims 1 to 6, wherein a surface of the auxiliary wing is subjected to a low friction treatment.

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