UA7401U - Liquid-circular machine - Google Patents

Abstract

A liquid-circular machine has a cylindrical housing with end covers and a working wheel installed in it in eccentric way, this has bushing with end grooves and the blades placed on it, at the end surfaces of those there are arranged radial grooves. The end grooves are made radial. The radial grooves at the end surface of the bushing adjoining the blades are connected to the radial grooves of the blades.

Description

Description of the invention

The useful model belongs to the field of vacuum and compressor engineering and can be used in liquid ring machines.

A known liquid-ring machine, which contains a cylindrical body with end caps and an eccentrically installed working wheel in it, which has a hub and vanes located on it, connected to each other by annular ribs, on the end surfaces of which annular grooves are made to fill them when the wheel is rotated by the working liquid (Av. St. USSR Mo 331186, МПК РО4С 19/00, 19701. 70 Due to the variable depth of immersion of the blades of the impeller in the liquid ring and the inertial inclination of the working fluid within each inter-blade channel, much more often the wheels are not immersed in the liquid ring in its lower part, as a result of which the working cells on the compression and suction sides are connected through the annular grooves on the ends of the connecting blades of the ribs, which contributes to the already quite intense flow of compressed gas through the end gaps between the end covers and the end surfaces of the impeller. These 12 overflows reduce performance, efficiency and maximum suction pressure (of a vacuum pump) or injection (in a compressor), and their compression requires additional power consumption.

As the closest analogue, a fluid-ring machine was chosen, which contains a cylindrical body with end caps and an eccentrically installed impeller in it, which has a bushing and vanes located on it, on the end surfaces of which radial grooves are made, and the bushing is equipped with annular end grooves (see Av. St. USSR Mo 1121500, IPK RO4S 7/00,19/00,19841.

The annular end grooves made on the hub of the impeller of this machine do not effectively cross the path of the flow of compressed gas from the compression side and the discharge side to the suction side through the end gaps between the end caps and the end surfaces of the wheel, because due to the limited dimensions of the wheel hub, their number is always limited for constructive and technological reasons. Radial grooves, made on the end surface of the blades along their entire length, also do not provide effective pt") sealing of the specified overflows, since the working fluid that enters them is thrown back into the liquid ring by inertial forces without creating a hydraulic valve in these grooves, the amount which are also limited by the number of blades.

In addition, in all mass-produced liquid-ring machines, the blades of the impeller consist (37) of a radial part that begins at the hub of the wheel, and a curved part smoothly connected to it, and bent in the direction of rotation of the wheel, which ends at the periphery of the wheel In this regard, the grooves on the end surface of the curved part of the blades must repeat its shape, and their execution is much more technologically complex than on the end surface of the radial part of the blades.

The basis of the useful model is the task of improving the liquid-ring machine by making the grooves on the end surface of the sleeve radial and, at the same time, the grooves located on its surface adjacent to the blades, combined with the radial grooves of the blades to create a labyrinth seal with a hydraulic valve from the working liquid, which ensures a reduction in compressed gas leaks from the compression side of the injection to the suction side through the end gaps, which leads to an increase in the productivity and efficiency of the machine. -

The task is solved by the fact that in a fluid-ring machine, which contains a cylindrical body with end caps and an eccentrically mounted impeller, which has a sleeve with end grooves and vanes are located on it, on the end surfaces of which radial grooves are made, according to with" a useful model, the mountain grooves of the bushing are made radial, and the radial grooves on the end surface of the bushing adjacent to the blades are connected to the radial grooves of the blades.

In addition, the radial grooves on the inter-lobe parts of the end surface of the bushing will be made with a radial size g smaller than the outer radius of the bushing by three times the width of the groove, in an amount that is a multiple of 7 blades. "" The use of a family-ring machine in combination with all the essential features, including excellent ones, ensures the reduction of leakage of compressed gas from the side of compression and injection to the side of suction through the gaps between the end surfaces of the covers and the impeller with the greatest efficiency. The mass flow - from 70 overflows without taking into account the sealing effect of the working fluid in the end gaps can be presented in the form of a formula. (Chistyakov F.M. et al. Centrifugal Compressors - M: Mashinostroenie, 19701:

A; Kg/s

S per - NOT aphid and ser

So where: y - consumption coefficient, which depends on the number of radial grooves on the end surfaces of the hub and wheel blades;

E - the area over which overflows occur through the end gaps, m;

Ar- pressure difference, under the influence of which overflows occur, kg/m; in Meer - the average specific volume of the flowing gas, mU/kg; d - acceleration of free fall, m/s.

Making the end grooves of the bushing radial ensures the formation of greater hydraulic resistance due to the execution of a larger number of grooves on the bushing, each of which forms its own hydraulic seal on the path of overflows.

The execution of radial grooves on the end surface of the sleeve adjacent to the blades, connected with 65 radial grooves of the blades, contributes to the formation of a hydraulic seal from the working fluid in these channels and simplifies the manufacturing technology, since they are formed in one pass of the same cutting tool.

The configuration of the radial grooves in their cross-section is determined by the shape of the forming tool, and their maximum depth lies within 0.8...1 mm and can decrease to zero as it is removed from the axis of rotation of the wheel.

The execution of radial grooves on the interblade sections of the end surface of the bushing with a radial size g smaller than the outer radius of the bushing by three times the width of the groove ensures the closure of the sealing working fluid in these grooves with the formation of a hydraulic seal, which also reduces the size. The execution of grooves with a larger radial size leads to an insufficient thickness of the bridges between the grooves and the working cells, as a result of which the conditions for the formation of a water seal and the associated 7/0 Sealing effect, which is expressed in the increase in the value of y, are violated. The execution of grooves with a smaller radial size leads to the appearance of additional overflows through the end gaps in the zone of thicker bridges (which is caused by an increase in E and n) between the grooves and working cells and the associated losses of productivity and power. The number of radial grooves on the interblade parts of the end surface of the bushing, a multiple of the number of wheel blades, allows placing a larger number of grooves on the bushing, which increases the labyrinth resistance on the 75 path of overflows due to the reduction of RE, р, etc. The multiplication factor is determined by the dimensions of the hub and the number of blades of the wheel.

As a result, productivity and efficiency of the machine increase.

In fig. 1 shows the longitudinal section of the liquid ring machine; in fig. 2 - cross-section of the machine, made in the plane of its end gap.

The liquid-ring machine contains a cylindrical body 1, an eccentric impeller 2 installed in it, consisting of a bushing C and vanes 4, the rotation of which creates a liquid ring 5, and end caps 6. Radial grooves 7 are made on the vaneless parts of the end surface of the bushing C , in an amount that is a multiple of the blades 4, with a radial size g smaller than the outer radius of the bushing Z by three times the width of the groove, and on the end surface of the bushing 3 adjacent to the blades 4, radial grooves 8 are made, connected with radial grooves 9, made on end surfaces of the radial part of the blades 4. 7

A fluid ring machine works like this. Inside the housing 1, closed from the ends with caps 6, when the impeller 2 rotates, a fluid ring 5 is formed, from which the working fluid enters the radial grooves 7 on the interblade parts of the end surface of the sleeve 3, as well as the radial grooves 8 on the end surface of the sleeve З, which adjacent to the blades 4 and the radial grooves 9 connected to them on the end surfaces of the radial part of the blades 4. In the radial grooves 7 and 8 and the radial grooves 9, when they are filled with the working fluid, a hydraulic seal is formed, which, together with the labyrinthine resistance of these grooves, is an obstacle on the path of the flow of compressed gas from the area of compression and injection to the area of suction through the end gaps between the impeller 2 and the end caps 6. As a result, the productivity and efficiency of the machine increase, and the power consumed by it decreases.

This design of the liquid-ring machine has the following advantages: 1. The productivity of the machine increases due to the reduction of the mass flow rate of compressed gas overflows through the end gaps. " 2. The compressive power of compressed gas flows decreases. - 3. Specific power decreases and efficiency increases due to increased internal tightness of the machine. s b M "is K : г" | Ж Ж 6 -- cha . - . ' -t

M FLOUR shk | (Ikh ; ; p Й u ki

M // 1-p-2 th ay, Pi M shchi z lila .sh 70 pi I- p s

he

WHAT t KO

C I gives | t 7 Y i U, I re 60 in ZAM K p

You are the current one in Fig. 1 A

A-A higher; 7 St x 9 U jus. and

As. -at

OM i i A 7 Languages - - I iii. y pre likh p I c

PO, -

Ua - -41.. 2 I and Tykh she she Vy nya U : x I x g k-- what 2

Fig. 2

Claims (2)

"- Formula of the invention about , , , , . , . " 1. A liquid-ring machine containing a cylindrical body with end caps and an eccentrically installed working wheel in it, which has a bushing with end grooves and vanes located on it, on the Me Z5 end surfaces of which radial grooves are made, which differs in that the end the grooves of the sleeve are radial, and the radial grooves on the end surface of the sleeve adjacent to the blades are connected to the radial grooves of the blades. " 2. The liquid-ring machine according to claim 1, which is characterized by the fact that the radial grooves on the interblade parts of the end surface of the bushing are made with a radial size g smaller than the outer radius of the bushing by three times o, 70 The width of the groove, in a number that is a multiple of the number of blades. c Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2005, M 6, 15.06.2005. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. -I sh" ("c) another 50 So 60 b5