CS231678B1 - Fluid ring machine wiring - Google Patents

Abstract

The purpose of the invention is to increase the efficiency of operation of a liquid-ring machine operating as a vacuum pump and connected in the working fluid circulation circuit. The stated purpose is achieved by sequentially connecting a bypass valve (7) and a mixer (9) with a connected supply (10) of fresh washing liquid after the circulation pump (6) of the circulation circuit (4). A pressure sensor (11) of the liquid-ring machine is connected to the mixer (S).

Description

f ^{Author * * * * in the order} MIKOLÁSSK FRANTIŠEK RNDr., OLOMOUC (54)

Connection of the liquid-ring machine

The purpose of the invention is to increase the economy of operation of a liquid ring machine operating as a vacuum pump and connected in a working fluid circulation circuit. This is achieved in that a bypass valve (7) and a mixer (9) with a connected supply line (10) are connected successively after the circulation pump (6) of the circulation circuit (4). liquid. A fluid pressure sensor (11) is connected to the mixer (S).

231 678

231 678

BACKGROUND OF THE INVENTION The present invention relates to a liquid ring machine, in particular operated as a vacuum pump.

In liquid-ring machines, working fluids are used not only to form a liquid piston, but also as a cooling medium. The amount of available suction pressure (usually with a vacuum pump) or discharge (usually with a compressor) is a function of the working fluid temperature. It is not possible to achieve a pump suction pressure lower than the saturated vapor pressure of the working fluid at a certain working fluid temperature. In general, the so-called guaranteed parameters of a liquid-ring machine at a working liquid temperature of 15 ° C are given. In most cases, it is not necessary for the liquid ring machine to reach the value of these guaranteed parameters or to achieve these values in the long term, because in most cases the designer chooses the machine with higher parameters to the required parameters. Such a machine then achieves a larger conveyed quantity at the same temperature of 15 ° C, which results in uneconomical operation, since such a machine has to be controlled, for example by sucking into the machine suction from another space. The low working fluid temperature of the liquid ring machine is achieved, for example, by an open circuit of fresh working fluid. The disadvantage of this type of cooling is the high consumption of working fluid. Further, it is known to connect a liquid ring machine with a closed circulation circuit, in which a cooler is connected. The disadvantage of this connection is the high energy consumption for cooling.

The above-mentioned disadvantages and drawbacks of known circuits of liquid-ring machines are essentially eliminated by the invention, which is the connection of a liquid-ring machine, operated in particular as a vacuum pump, consisting of a working fluid circulation circuit. the inner space of the tele231 878 s of the liquid ring machine, and is based on the fact that, between the circulation pump and the inner space of the machine body, a bypass valve and a mixer are connected successively with a fresh working liquid supply connected.

It is a further object of the invention that a suction pressure sensor of a liquid-ring machine is connected to the mixer.

The higher effect of the invention is achieved by optimum operation of the fluid-ring machine by controlling the temperature of the working fluid in dependence on the suction pressure of the machine with a minimum consumption of working fluid and energy.

An example of a particular embodiment of the invention is shown schematically in the accompanying drawing, representing a block diagram of a liquid-circular machine with the present invention.

The circuit according to the invention consists of the liquid-ring machine itself, consisting of a body 1 provided with a suction port 2 and a discharge port 2, after which a working liquid separator 2, a circulation pump 6, a transfer valve 2 with waste connected 8 working fluid, mixer 2 ^{3 with} connected fresh water inlet 10 and the interior of the machine body 1. The mixer 9 is further connected to a suction pressure sensor 11 located in the suction neck 2 of the machine.

In the case of a standstill of a liquid-circular machine, the machine body 1 is usually filled with working fluid. After the start of the liquid ring machine when it starts the circulating pump 6, the working fluid formed in the housing 1 a ring from which dopravovanýV ^ TTebou entrain the working fluid into the discharge port 2 and from there into the separator of Covaci 2 · ^{from the} separator ^{2, the} working fluid is pumped through the circulation pump 6 through the relief valve 2 and the mixer 2 into the body 1. The pressure in the suction port 2 is high at the beginning of the evacuation of the enclosure (not shown) and the working fluid temperature is lower due to its optimum value corresponding to this high suction pressure. circulation circuit 4 ⁱⁿ such ^a case added.

While the machine is running, the pressure in the suction nozzle 2 gradually decreases until at some point the suction pressure drops below the optimum level corresponding to the instantaneous temperature of the working fluid entering the body 1, which has so far been caused by compression losses.

- 3 gas increases. The mixer 2, which to this point has been adjusting the optimum working fluid outlet temperature from mixer 2 »based on the pressure sensor 11, will start adding fresh working fluid to the circulation circuit 8 so that the working fluid temperature / leaving the mixer 2/0 ⁽ ^ P ° ^v) If the suction pressure drops further, the temperature of the working fluid coming out of the mixer 2 and entering the machine body 1. The working fluid circulation will cease and the working fluid will cease if the optimum working fluid temperature is lower than the fresh working fluid temperature. Only the fresh working fluid exits the mixer 2. The excess working fluid is discharged from the overflow valve 2 to the drain 8.

Alternatively, an additional cooler 12 may be provided in the circulation circuit 6 between the circulation pump 6 and the mixer 2 thereof between the circulation pump 6 and the outlet neck 2.

In case of slow changes of suction pressure or failure of pressure sensor 11, mixer 2 can be operated manually. The connection of the mixer 2 ^{and the} pressure sensor 11 is therefore not necessarily necessary.

AND

Claims (2)

SUBJECT OF THE INVENTION 231 678 1 · Connection of a liquid-ring machine, operating in particular as a vacuum pump »consisting of a working fluid circulation circuit in which the liquid-ring machine discharge, the working-liquid separator, the circulation pump and the inner space of the liquid-ring machine body (6) and the inner space of the machine body (1) are connected sequentially a bypass valve (7) and a mixer (9) with connected fresh water supply (10). Connection according to claim 1, characterized in that a suction pressure sensor (11) of the liquid-ring machine is connected to the mixer (9). 1 drawing 231 678