RU2832788C1 - Compressor with liquid ring - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to compressors with a liquid ring. Compressor comprises housing 1 with working chamber installed with possibility of rotation from electric motor, right and left end covers 4 and 3, liquid ring 22 formed in chamber. Compressor is equipped with an auxiliary pump, a set of shutoff valves, suction and injection gas valves 12 and 7 made in cover 4. In cover 4 there are also injection grooves 8 for liquid. In cover 3 there are suction grooves 6 for liquid. Auxiliary pump by means of a set of shutoff valves is made with possibility of pumping liquid into liquid ring 22 from the tank and suction from liquid ring 22 of liquid into the tank to increase or decrease the volume of the working chamber.

EFFECT: invention is aimed at increasing the overall isothermal efficiency by increasing the hydraulic efficiency by excluding the impeller from the main working members.

1 cl, 8 dwg

Description

The claimed technical solution applies to compressors with a liquid ring.

The technical task of the claimed invention is to increase the overall isothermal efficiency of liquid ring machines by increasing the hydraulic efficiency by eliminating the impeller from the main working elements.

A liquid ring machine is known (RU No. 2056537 C1) comprising a housing, a hollow impeller eccentrically placed therein with a gap and with the ability to rotate, with blades forming working chambers, and a stationary hollow distribution shaft with a partition forming an input branch pipe on one end of the shaft and an output branch pipe on the other, fixed parts of bearings are placed on the shaft with an eccentricity, in which channels for supplying and removing liquid are made, while the housing is installed with the ability to rotate from an electric motor and with the formation of a liquid ring, the impeller is freely mounted on bearings on the outer side of the shaft and is made of two end disks and radial flat blades rigidly connected to them, equipped with sealing elements located on the shaft side.

The disadvantages of this design are the discrepancy in the peripheral speeds of rotation of the housing and the rotor (driven by the liquid ring) and the friction of the antifriction material inserts on the stationary hollow shaft and, as a consequence, the violation of the geometry of the liquid ring, and the increased resistance to rotation of the rotor, which leads to a decrease in the efficiency.

The closest device is a liquid-ring machine (RU No. 2294456 C1) containing a housing, an impeller placed in it with eccentricity and the ability to rotate on a fixed distribution shaft with a partition forming an input branch pipe on one end of the shaft and an output branch pipe on the other. The housing is installed with the ability to rotate from an electric motor. On the inner cylindrical surface of the housing, there are rigidly fixed radial blades with an angle of inclination and a length that ensure the transmission of rotation to the impeller. The number of blades in the housing is equal to the number of blades in the impeller.

The disadvantage of this design is the complexity of the design (a hollow shaft located eccentrically, on which an impeller with the ability to rotate is additionally located) and additional power costs for rotating the impeller, which creates hydraulic losses and thereby leads to a decrease in the efficiency of the liquid ring machine.

The technical task of the claimed invention is to increase the overall isothermal efficiency of liquid ring machines by increasing the hydraulic efficiency by eliminating the impeller from the main working elements.

The said task is achieved in that the compressor with a liquid ring comprising a housing with a working chamber mounted with the possibility of rotation from an electric motor, right and left end covers, a liquid ring formed in the working chamber, according to the invention, is provided with an auxiliary pump, a set of shut-off valves, suction and discharge valves for gas, made in the right cover, in which discharge passages for liquid are also made, and in the left cover suction passages for liquid are made, wherein the auxiliary pump by means of a set of shut-off valves is made with the possibility of pumping liquid into the liquid ring from a tank and sucking liquid from the liquid ring into the tank to increase or decrease the volume of the working chamber.

The proposed design is illustrated by drawings, where:

Fig. 1 shows the liquid ring machine assembled without liquid.

Fig. 2 shows a liquid ring machine assembled and filled with liquid.

Fig. 3 shows a simplified schematic diagram of a liquid ring machine.

Fig. 4 shows the process of liquid ring formation.

Fig. 5 shows the process of gas compression.

Fig. 6 shows the gas injection process.

Fig. 7 shows the process of reverse expansion of gas.

Fig. 8 shows the process of sucking fresh gas into the working chamber.

The proposed compressor with a liquid ring consists of a housing 1 rotating by means of an electric motor, onto which rolling bearings 2 are placed. Fixed end left cover 3 and right cover 4 are placed onto rolling bearings 2. In the fixed end left cover 3 the following are made: a threaded opening 5 and suction grooves 6. In the fixed end right cover 4 the discharge valve 7 is located; the following are made: discharge grooves 8 and a threaded opening 9 for connection with subsequent process equipment, for example, a receiver. Also, in the fixed end right cover 4 the following are made: a threaded opening 10, grooves 11 for liquid drainage (in Fig. 1 the dotted line) and a suction valve 12 for supplying fresh gas. The tightness of the connection of the housing 1 with the fixed end covers 3 and 4 is ensured by the seal 13 made of antifriction material. The closed volume between the housing 1, fixed end covers 3 and 4 is created by the working chamber 14. The design also contains a set of shut-off valves 15, 16 for pumping liquid by means of an auxiliary pump 17 from a tank 18 into the working chamber 14 and shut-off valves 19 for sucking liquid from the working chamber 14 and returning it to the tank 18. The tank 18 is equipped with a liquid level control sensor 20. The rotation of the housing 1 is driven by an electric motor 21.

The claimed compressor with a liquid ring operates as follows: the operating electric motor 21 transmits torque to the housing 1 by means of a gear, wedge-belt or any other type of connection. The set of shut-off valves 15, 16 opens and the auxiliary pump 17 starts, which pumps liquid from the tank 18 into the working chamber 14. The rotating housing 1 captures this liquid, thereby creating a liquid ring 22, which will serve as a kind of piston (Fig. 4). In turn, the auxiliary pump 17 continues to pump liquid into the working chamber 14, the liquid ring begins to narrow (reduce its internal diameter), reduce the volume of the working chamber 14 and thereby compress the gas in the working chamber 23 (Fig. 5). When the required pressure of the compressed gas 23 is reached, the discharge valve 7 will open and the process of injection will occur through the discharge grooves 8, for example, into the receiver (Fig. 6)

Knowing the volume of liquid by which it is necessary to empty tank 18 to achieve the required pressure of compressed gas 23, level control sensor 20 is adjusted. Upon reaching this level, the set of shut-off valves 15, 16 will automatically close and shut-off valve 19 will open. Auxiliary pump 17 will begin to suck liquid from liquid ring 22 and return it to tank 18. Liquid ring 22 will begin to decrease in diameter, thereby increasing the volume of working chamber 14 (Fig. 7). Compressed gas 23 remaining in the dead volume will begin to expand back. At the moment when liquid ring opens suction valve 12, working chamber 14 will be filled with a fresh portion of gas (Fig. 8). Upon reaching the maximum level of liquid in tank 18, shut-off valve 19 will automatically close and set of shut-off valves 15, 16 will open and the process is repeated.

The proposed compressor with a liquid ring allows to increase the overall isothermal efficiency of liquid ring machines by increasing the hydraulic efficiency by eliminating the impeller from the main working parts.

Claims (1)

A compressor with a liquid ring comprising a housing with a working chamber mounted with the possibility of rotation from an electric motor, right and left end covers, a liquid ring formed in the working chamber, characterized in that the compressor with a liquid ring is equipped with an auxiliary pump, a set of shut-off valves, suction and discharge valves for gas made in the right cover, in which discharge passages for liquid are also made, and in the left cover suction passages for liquid are made, wherein the auxiliary pump by means of a set of shut-off valves is made with the possibility of pumping liquid into the liquid ring from a tank and sucking liquid from the liquid ring into the tank to increase or decrease the volume of the working chamber.