RU2414625C1 - Multi-stage liquid-ring compressor - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: multi-stage liquid-ring compressor includes external rotor 1 and internal rotor 31, which can be rotated from external drives 2 and 18 respectively. Rotor 1 forms liquid ring 6 with free surface 8 in ambient gas medium during rotation with working liquid. Rotor 31 is arranged with eccentricity in liquid ring 6 and has discs 7, 10, 12, and 14 which do not go beyond limits of liquid ring 6 and form hydraulic locks in pairs with discs 5, 16 of rotor 1. Closed suction cavity filled with gas and impeller put on rotor 31 shaft is located between locks in each section of liquid ring 6. In flow part of impeller there located is suction chamber 9 cyclically going beyond volume limits of liquid ring 6 during rotor 31 rotation. Delivery channel 24 with delivery valve 25 enters suction cavity of impeller of the next stage. Ratio of rotation frequencies of rotors 1 and 31 is permanent.

EFFECT: enlarging the range of gas pressures required for the consumer.

Description

The invention relates to the class of liquid-ring machines, the scope of which is wide enough and includes those branches of industrial and agricultural production, where there is a need for suction or compression of air or gases. In this class of machines, the main functional element is a liquid ring, part of which fills a limited volume in the flowing part of the impeller and, moving when the impeller rotates, sucks or displaces a certain volume of gas, i.e. plays the role of a fluid piston.

A vacuum hydro-ring pump is known (see RU 2240445 C2, F04C 7/00, November 20, 2004), comprising a rotatable cylindrical body with a working fluid, an impeller eccentrically placed in it, a stationary gas distribution pipe divided into input and output channels. Rotation through the pulley is communicated to the impeller. The working fluid transmits rotation from the impeller to the housing.

Presented as the closest prototype, the device has two rotors - an external one, designed to create a liquid ring, and an internal one with an impeller in the form of an impeller with end disks. Both rotors rotate in one direction, which significantly reduces friction losses in the liquid ring, complementing the set of useful properties of liquid ring machines, which are widely used as compressors and vacuum pumps. However, like any other volumetric single-stage compressor, the device in question can be used only in a limited range of gas pressures required by the consumer.

To solve the problem of reducing the negative impact of the noted drawback of liquid-ring compressors and expanding the scope of their application, it is proposed to use a multi-stage liquid-ring compressor, which includes an external rotor, made with the possibility of rotation from an external drive, creating during rotation with the working fluid coming from the device supply, a liquid ring with a free surface in the surrounding gas environment, formed by a shell with side walls and disks that determine the radius the free surface of the liquid ring, axially divided by disks into sections forming steps, an internal rotor arranged eccentrically in the liquid ring, rotatable from an external drive, having disks not extending from the liquid ring, forming in pairs with disks external rotor hydraulic locks, between which in each section of the liquid ring there is a closed suction cavity filled with gas and a working cup sitting on the shaft of the internal rotor is placed ECO, in the flowing part of which there is a suction chamber cyclically emerging during rotation of the internal rotor from the limits of the volume of the liquid ring section, designed to transfer a portion of gas from the suction cavity to the increased pressure zone of the liquid ring section, and a discharge channel with a discharge valve that goes into the working suction cavity wheels of the next stage, while the ratio of rotor speeds is unchanged.

The drawing shows a schematic representation of the proposed device.

The external rotor 1 rotates around axis 29, receives rotation from the drive 2 and is intended to create a liquid ring 6 with a free surface 8 in the surrounding gas environment. The bearings 3 of the rotor 1 are located on the fixed pins 33 of the compressor housing. When a working fluid is supplied to a rotating rotor 1 through a channel 20 of a supply device located on a fixed housing, a liquid ring is formed, formed by a shell with side walls. Disks 5, 16 determine the radius of the free surface of the liquid. The liquid ring is axially divided into sections using discs 11, 22. Excess liquid is removed from the ring through channel 4.

The bearings 28 of the inner rotor 31 are located in the eccentric bores of the trunnions 33. The rotor 31 rotates around the axis 30, receives rotation from the drive 18, the ratio of rotor speeds is constant. On the shaft of the inner rotor 31, there are disks 7, 10, 12, 14, the peripheral areas of which do not go beyond the limits of the liquid ring during rotation and which, in pairs with the corresponding disks 5, 11, 22, 16 of the outer rotor 1, form hydraulic locks that create closed cavities filled with gas suction 27, 23, 21 and the discharge cavity 17. The cavity 27 is connected by a channel 32 to the compressor suction pipe, and from the cavity 17, the gas enters the discharge pipe through the channel 19. The impellers 26, 13, 15 of each compressor stage are located on the shaft of the inner rotor 31 and are placed in the corresponding sections of the liquid ring. The flowing part of the impeller consists of a suction chamber 9 located on the periphery of the wheel in the form of an open vessel with a discharge valve 25 in the bottom and a discharge channel 24 that outputs compressed gas to the suction cavity of the next stage. That is, the discharge channel of each previous stage is the suction channel for the next stage after it. When the suction chamber 9 is rotated together with the rotor 31, its peripheral edges go out of the liquid ring volume and enter the suction cavity, the suction chamber 9 is filled with gas and transfers a portion of the gas to the high pressure region of the liquid ring, where gas is extruded through valve 25 into channel 24 .

The number of steps can be any - from one or more.

As can be seen from the schematic drawing, there is a need for a sealing device for the gap between the rotor shaft 31 and the compressor housing in the area of the suction pipe. In the high-pressure region, it is necessary to seal the gap between the outer rotor 1 and the compressor housing, as well as the gap between the inner rotor 31 and the compressor housing.

Thus, in contrast to the vacuum ring pump considered as the closest prototype, the proposed device has an external rotor equipped with an external drive, designed to create a liquid ring with a free surface in the surrounding gas environment. The liquid ring is formed by a sidewall with a sidewall. The radius of the free surface of the liquid ring is determined by the disks. In addition, there are disks that divide the liquid ring in the axial direction into sections forming steps.

The internal rotor, like the impeller of the prototype, is eccentric in the liquid ring, has an external drive, which, unlike the prototype, allows, in combination with the drive of the external rotor, to maintain an unchanged ratio of rotor speeds.

In contrast to the prototype, disks are located on the shaft of the inner rotor, the peripheral areas of which do not go beyond the limits of the liquid ring during rotation. The indicated disks of the internal rotor in pairs with the corresponding disks of the external rotor form hydraulic locks, which create closed suction cavities filled with gas and an injection cavity, from which the gas enters the discharge pipe through the channel.

The impellers are also located on the shaft of the inner rotor, placed in the corresponding sections of the fluid ring. The flowing part of each impeller consists of a suction chamber located on the periphery of the wheel in the form of an open vessel with a discharge valve in the bottom and a discharge channel that discharges compressed gas into the suction cavity of the next stage and is the suction channel for this next stage. When the suction chamber rotates, along with the internal rotor, its peripheral edges go beyond the limits of the liquid ring volume and enter the suction cavity, the suction chamber is filled with gas and transfers a portion of gas to the high pressure region of the liquid ring, where a portion of gas is extruded through the discharge valve into the discharge channel.

Thus, the flow part of the impeller of the proposed device differs from the flow part of the impeller of the closest prototype.

Claims (1)

A multistage liquid-ring compressor, which includes an external rotor, made with the possibility of rotation from an external drive, creating, when rotating with a working fluid coming from the supply device, a liquid ring with a free surface in the surrounding gas environment, formed by a shell with side walls and disks determining the radius of the free surface of the liquid ring axially divided by disks into sections forming steps, an internal rotor placed with an eccentric itet in the liquid ring, made to rotate from an external drive, having disks not extending from the limits of the liquid ring, forming water locks in pairs with the disks of the external rotor, between which in each section of the liquid ring there is a closed suction cavity filled with gas and placed on the internal shaft the rotor of the impeller, in the flowing part of which there is a suction chamber cyclically emerging during rotation of the inner rotor from the limits of the volume of the liquid ring section, before Assigning to transfer a portion of gas from the suction chamber to the high pressure fluid zone of the ring section and the discharge channel with a pressure valve, leaving the cavity suction impeller next stage, wherein the ratio of the rotor speed is constant.