JPH0996283A - Liquid sealed helical compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve suction/delivery efficiency, through improving volumetric efficiency of delivery, and preventing a sealed fluid from heating suction vapor and cooling delivery vapor, by largely taking an opening part area of suction/ delivery ports and an axial directional length of first confined space. SOLUTION: A rotor 3 is eccentrically mounted in a cylinder 2 sealed with an operating medium fluid to have suction/delivery ports 5, the rotor 3 is formed by mounting a single or several streaks of helical blades in a rotor shaft 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical vapor compressor used in refrigeration cycles, heat pump cycles and the like. A compressor used in a refrigeration cycle or a heat pump cycle sucks a working medium gas in a saturated vapor state or a heated vapor state, compresses it to a high temperature, high pressure heated vapor state, and discharges it.

[0002]

2. Description of the Related Art A conventional pump for compressing low-pressure steam, such as a vapor compressor used in a heat pump cycle, has a large scale and has a complicated structure. Therefore, a liquid ring vacuum pump may be used as a vacuum pump having a simple mechanism.

As shown in FIG. 6, an impeller 103 is eccentrically mounted in a cylindrical casing 102 of the liquid ring vacuum pump 101, and an appropriate amount of the sealing liquid 104 is put in the casing 102, and the impeller 103 is inserted. When rotated, the sealing liquid flows along the inner wall of the casing 102 due to the centrifugal force, and creates a void 105 in the center. This void 105 is impeller 1
Along with the rotation of 03, it moves in the radial direction to act as a piston, and acts to suck and discharge steam with respect to the rotation of the position of the impeller ("Fluid Machine" by Hidetoshi Kusama and Toshimichi Sakai, Kyoritsu Shuppan 224-Liquid. See the sealed rotary pump).

[0004]

The liquid-sealed vacuum pump 101, of course, sucks and discharges while rotating the position in an independent space partitioned by the vanes 106. As a result, the suction port and the discharge port cannot be made large, and the volume efficiency of suction and discharge is poor. Further, since the suction and the discharge are performed at the same position in the axial direction of the impeller, the temperature of the sealing liquid becomes the same for both the suction steam and the discharge steam, and the suction steam is heated by this sealing liquid. Since the discharged vapor is cooled, it is a cause of lowering the suction and discharge efficiency.

The present invention has been made in view of the above circumstances, and the opening area of the suction port and the discharge port can be made large, so that the axial length of the space initially confined can be made large. A liquid seal that can improve the suction and discharge volumetric efficiency, and can prevent the liquid seal from heating the intake vapor and cooling the discharge vapor to improve the suction efficiency and the discharge efficiency. An object of the present invention is to provide a rotary helical compressor.

[0006]

To this end, the liquid ring type helical compressor of the present invention encloses a working medium liquid,
A rotor is eccentrically mounted in a cylinder having an absorption port and a discharge port, and the rotor is characterized in that one or several helical blades are mounted on a rotor shaft.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The details of the present invention will be described below with reference to the drawings showing an embodiment.

In FIGS. 1 and 2, reference numeral 1 is a liquid ring type helical compressor. The liquid ring helical compressor 1 is configured by mounting a rotor 3 inside a cylinder 2.

The cylinder 2 has a cylindrical internal space, and has an intake port 4 at one end and a discharge port 5 at the other end. The rotor 3 is mounted in the cylinder 2 at an eccentric position. The rotor 3 has a rotor shaft 7 and a rotor shaft 7
It is composed of one or a plurality of blades 8 spirally attached to the circumference of. The outer diameter D of the rotor 3 is the same in the rotation axis direction.

A sealing liquid 11 is enclosed in the cylinder 2. The same liquid as the working medium is used as the sealing liquid 11, and water or a mixture of water and ethanol can be used. Further, when the same liquid as the working medium is used, if the vapor is too high, a liquid having a low vapor pressure such as oil can be used.

The action of compressing water vapor in the liquid ring helical compressor 1 thus constructed is as follows.
A sealing liquid 11 is sealed in the cylinder 2 from the suction port 4. When the rotor is rotated in this state, the sealing liquid 11 adheres to the inner surface 12 of the cylinder 2 by the action of centrifugal force to form a sealing liquid layer 13, and a void 14 is formed at the center thereof. The thickness of the liquid sealing layer 13 is uniform, whereas the rotor shaft 7 of the rotor 3 is eccentric to the center of the cylinder 2, and the blades 8 are the inner surface 1 of the cylinder.
Since it is immersed in the liquid sealing layer 13 of No. 2, the spiral blade 8 provided on the rotor 3 moves from the liquid surface of the liquid sealing to the void 14 at the center of the cylinder 2 as it rotates, and then it is adjacent to it. An independent space is formed between the blade 8 and the rotor shaft 7 and the liquid sealing layer 13 attached to the inner peripheral portion of the cylinder, and this independent space serves as a compression space 15 for compressing the working gas.

The compression space 15 starts from the portion A where the liquid sealing layer 13 and the rotor shaft 7 come into contact with each other and gradually increases in cross-sectional area, passes through the portion C having the maximum cross-sectional area, and then gradually decreases in cross-sectional area. The compression space 15 is formed in a spiral shape from the portion A to the portion B, since the rotor shaft 7 and the liquid sealing layer 13 located axially forward are in contact with each other at the minimum sectional area B. . Therefore, the portions A, C and B are axially separated from each other, that is, the suction port 4 and the discharge port 5 are separated from each other. The air compressed in the vicinity of the terminal end of the compression space 15 is sent in the axial direction by the amount of the lead in accordance with a plurality of rotations of the rotor 3,
Discharge from the discharge port 5 at the end of the cylinder 2.

[0013]

Other Embodiments In the above embodiments, the inner diameter of the cylinder 2 and the outer diameter of the rotor 3 are uniform in the axial direction, and the pitch P of the blades 8 of the rotor 3 is also uniform in the axial direction. In order to send the compressed steam having a high compression ratio, the structure may be such that the steam is compressed as it is sent in the axial direction. For that purpose, the volume of the independent compression space 15 decreases as it goes to the discharge port side in the axial direction. It should be structured.

In order to have a structure in which the volume of the compression space 15 becomes smaller as it is sent to the discharge side in the axial direction, as shown in FIG. 3, the pitch Pi of the blades 8 is set to be smaller than that on the suction port side. It may be configured such that it gradually becomes smaller on the side. Further, the diameter of the rotor shaft is configured to be gradually larger on the discharge port side than on the suction port side. By doing so, the volume of the independent compression space 15 can be made smaller gradually on the discharge port side than on the suction port side, and the vapor can be gradually compressed toward the discharge port side rather than the suction port side, resulting in a structure of high pressure. it can.

[0015]

Example An experiment was conducted by manufacturing a liquid ring compressor for an experiment. The outline of the liquid ring type helical compressor for experiment is as follows: rotor shaft diameter 30 mm, helical blade diameter 61 mm, cylinder inner diameter 80
mm, blade pitch 120 mm, total length of spiral blade 250 m
m.

The experimental results are shown in FIGS. 4 and 5. FIG. 4 shows the relationship between the rotation speed and the suction speed, and FIG. 5 shows the relationship between the rotation speed and the volume efficiency.

The experimental conditions were such that air at atmospheric pressure was released at atmospheric pressure, and the experiment was carried out at room temperature. Water is used as the sealing liquid.
Here, we succeeded in sucking and exhaling gas.
Although the volumetric efficiency shows a low value, this is because the interval between the suction port and the helical blade is too large, and it can be expected that a large volumetric efficiency can be obtained by precisely processing this. Further, it can be expected that the rotational speed at which the maximum flow rate is generated is increased by this precise processing.

[0018]

In the liquid ring helical compressor of the present invention, since the suction port and the discharge port are axially spaced, it is not necessary to provide the suction port and the discharge port at the same axial position, and the suction port The open area of the mouth and the discharge port can be made large. Therefore, the axial length of the suction space for initially confining the vapor can be made large, and thus the amount of the vapor to be sucked can be increased. Further, since there is a sealing liquid layer having a large axial length between the suction port and the discharge port, it is possible to give a temperature gradient to the sealing liquid layer in the axial direction, and the suction vapor is sealed in the suction port. It is possible to prevent the liquid sealing helical compressor from being heated by, and to prevent the high temperature and high pressure gas from being cooled to the liquid sealing layer at the discharge port, and thus it is possible to obtain the liquid ring helical compressor having high thermal efficiency.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a liquid ring helical compressor.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical cross-sectional explanatory view of another liquid ring type helical compressor.

FIG. 4 is a graph showing the relationship between the rotation speed and the suction speed.

FIG. 5 is a graph showing the relationship between rotation speed and volume efficiency.

FIG. 6 is a cross-sectional explanatory view of a conventional liquid ring vacuum pump.

[Explanation of symbols]

 1 Liquid ring type helical compressor 2 Cylinder 3 Rotor 4 Suction port 5 Discharge port 7 Rotor shaft 8 Blade 11 Liquid seal 12 Cylinder inner surface 13 Liquid seal layer 14 Vacancy 15 Compressed space

Claims (3)

[Claims] 1. A working medium liquid is sealed, and a rotor is eccentrically mounted in a cylinder having an intake port and a discharge port, and the rotor has one or several helical blades mounted on a rotor shaft. Liquid ring type helical compressor. 2. The liquid ring helical compressor according to claim 1, wherein the pitch of the helical blades is gradually smaller on the discharge port side than on the absorption port side. 3. The liquid ring helical compressor according to claim 1, wherein the rotor shaft of the rotor is gradually larger on the discharge port side than on the absorption port side.