EP1262720B1 - Degassing device for liquids in a closed or open circuit - Google Patents

Abstract

The bleed for a heating fluid circuit includes a bleed gas container (1) with a feed pipe (11) and a bleed (4) having a rotary suction pump (3) to aspire the fluid over suction stub (28) and with return flow into the circuit. The single feed pipe (11) of the circuit (13) extends into the bleed container from the pipe (11) which opens into the upper half of the container via an injector nozzle (2). The gas pipe (10) opens in a float (14) in the water tank (6).

Description

The invention relates to a device for degassing heating or cooling installations, in which water, oil or water with additives to freeze it prevent, is used for heat transfer. In the fluid circuits These plants are dissolved gases, especially air from the environment, and these promotes corrosion inside the pipes. For this harmful influence to prevent the gases are excreted regularly from the circulatory fluid. This is achieved by means of Druckstufenentgaser, as for example in Heating systems are used. The pressure stage degassing is based on the The principle that - the higher the pressure in a liquid is - the more gas in it can be solved. Therefore, by lowering the pressure in the liquid medium a degassing can be achieved.

From EP 0'856'135 B1 is a method and an apparatus for degassing a liquid in a substantially closed system of a plant known. According to this patent, by means of a circulation pump taken from the substantially closed system to be degassed liquid, by means of a shut-off valve approximately in the form of a solenoid valve in a degassing is sucked in, flows into the underside of these and also flows out through an outlet in the bottom and afterwards through the circulation pump the closed system via a check valve is fed again. In the degassing tank, a cylindrical, standing and top dome-shaped closed container degassing takes place by the vacuum built up therein by the circulation pump. To a negative pressure to generate, is the current in the liquid circulation in circulation pump the degassing interrupted by closing a shut-off valve. The Circulating pump is turned off at certain time intervals for a short time to to vent them. By reopening the solenoid valve, the pressure increases Degassing tank slightly above the atmospheric pressure on and thereby becomes the gas excreted above the liquid level at a reduced pressure upwards over a valve unit at the upper end of the degassing tank in the environment pushed out. It's called the flushing process. After a maximum of 30 Seconds closes the solenoid valve again. To prevent liquid Too fast in the venting unit at the top of the degassing tank is a chicane below the corresponding valve unit in Degassing installed, which must be flowed around by the gas. The Degassing is operated continuously as cycle proceeds cycle. The Circulation pump itself is arranged by means of a separate, on her Degassed degassing vessel. This proves to be important, and this is all 4 until 10 minutes turned off the circulation pump for a few seconds, causing the Pressure in the degassing vessel rises and ejected the collected gases become. Without this degassing of the circulation pump their safe operation would not be guaranteed, because she would run dry. From the feed-back line behind the Circulation pump leads from a line to the top of the Entgasungsbehälters, wherein the line opens via a spray nozzle. Through this Injection of already degassed liquid in the degassing is achieved by the spray effect a very large additional degassing. That too degassing water is whirled up and the spray effect is generated from the nozzle additionally an enlarged water surface. Thus, by these two Effects releases the gases bound in the medium. This degassing process In the vacuum is always the same length as the rinse. When the flushing process medium, the medium flows out of the system very quickly Degassing and the previously released gases are via the deaerator pushed out.

This degassing causes due to their large Entgasungsgefässvolumens from 8 to 12 liters content not insignificant pressure fluctuations in the otherwise closed circulation system of a system, for example a heating system, which are very undesirable. The minimum size of the degassing tank such a plant when using an integrated pressure holding station is about 4 liters. Because the liquid supply into the degassing vessel intermittently takes place, valves are also required, which sometimes pressure shocks and cause flow noise in the fluid circuit. In case of leaking Check valve on the breather is sucked back gas, resulting in wrong Gas measurements leads. Furthermore, the operation of this device has to be ongoing be regulated and controlled, that is, it must be the circulation pump on and be switched off and valves must be opened and closed, What does it all with a corresponding amount of control and Control devices must be accomplished.

For the gas measurement and the control of the device based thereon often a system is used in which after the breather Check valve is installed to suck in air in the vacuum phase prevent. After the check valve, an aperture is installed. Between the Aperture and the check valve branches off a departure, where an adjustable Pressure switch is mounted in the mbar range. This entire unit is on highest point of the degassing container. Will now gas from the degassing tank ejected, so created before the aperture a minimal back pressure, until gas escapes into the atmosphere. This pressure is from the pressure switch registered and processed in an electronic system. Is after a certain time the Gas exhaust is too low, the device is switched off for 24 hours and then it starts to measure again. Will the check valve leaking, which is easily done can, as soon as condensate is expelled with the gas, so is too much Gas measured and the device stops shutting off. After this system can the rest worked only with a minimum degassing of 2 liters become. Since in an even smaller degassing too small amounts Gas can be eliminated, the pressure switch could no longer register. But the larger the degassing tank, the larger the Pressure fluctuations in the system, which arise in the vacuum phase. These Fluctuations must be recovered with additional equipment.

It is therefore the object of the present invention to provide a device for degassing liquids in a closed or open circuit to provide which the same degassing performance as the above-described Device with a much smaller degassing yields without Regulatory organs in the intake and the pressure line manages, so no solenoid valves, no pressure control valves, no throttle valves or orifices or baffles requires and with which a certain maximum gas content very easy and is certainly sustainable. Not least, it is also an object of the invention, a to provide such device for degassing of liquids that constructive easier and therefore less expensive to manufacture, and the one increased Operational safety and service life guaranteed.

This object is achieved by a device for degassing liquids in a closed or open circuit, consisting of a Degassing tank with a supply line and a breather and subsequent thereto Gas line and a circulation pump for suction of medium via a suction nozzle from the lower region of the degassing tank and Feeding back into the cycle, which is characterized by being the only one Supply line from the circuit to the degassing tank consists of a line, in the upper half of the degassing via an injector nozzle in the Inside flows, and the gas pipe in an associated water tank adjacent to the top of a vertically movably mounted float empties.

Two preferred embodiments of this device are hereafter described in detail with reference to the drawings and their function is explained.

Figur 1:

Die schematische Darstellung der Vorrichtung in einer Variante ohne automatische Nachspeisung in den Wasserbehälter;

Figur 2:

Die schematische Darstellung der Vorrichtung in einer Variante mit automatischer Nachspeisung in den Wasserbehälter;

Figur 3:

Eine Planzeichnung der Vorrichtung gemäss dem Schema nach Figur 1 in einer Ansicht von der Seite her gesehen;

Figur 4:

Eine Ansicht des Entgasungsbehälters der Vorrichtung nach Figur 3 in besagter Figur 3 von links her gesehen;

Figur 5:

Den Schwimmer im Wasserbehälter und der mit ihm gebildete Kontaktschalter.

It shows:

FIG. 1:

The schematic representation of the device in a variant without automatic Nachspeisung in the water tank;

FIG. 2:

The schematic representation of the device in a variant with automatic make-up in the water tank;

FIG. 3:

A plan drawing of the device according to the scheme of Figure 1 seen in a view from the side;

FIG. 4:

A view of the degassing of the device of Figure 3 in said Figure 3 seen from the left;

FIG. 5:

The float in the water tank and the contact switch formed with it.

FIG. 1 shows the essential elements of the device for its operation. The degassing tank 1 has the shape of a horizontal cylinder, here is shown schematically from the side. A circulation pump 3 is in built his drain line 12. The supply line 11 from the circuit 13 leads through a dirt filter 5 and then via an injector nozzle 2 into the interior of the Degassing tank 1, in its upper half. At the top of the degassing tank 1, the gas line 10 is connected to discharge the excreted gases. It leads via the breather 4 in a water tank 6. In this Water tank 6, a float 14 is arranged with a contact switch 9. The water tank 6 is also equipped with an overflow pipe 15. As a result of evaporation, there is a loss of fluid in the water tank 6, so water has to be refilled from time to time, what manually here too took place.

FIG. 2 shows the device which is practically the same but additionally with an automatic water make-up to compensate for water loss in the Water tank 6 due to evaporation. In the water tank 6, this is a refill valve 7 with hinged thereto float 36 installed. About this will be at Demand cold water fed from the power line 8 in the water tank 6. In addition, with this version with automatic water make-up, the water tank is 6 via an additional connecting line 17 with integrated magnet 45 and check valve 16 connected to the degassing tank 1, to which also a pressure gauge 18 is connected.

FIG. 3 shows a plan drawing of the device according to the diagram of Figure 1 seen in a view from the side. The device is on a mounting plate 26 constructed. About rubber bearing 27 is the circulation pump. 3 bolted to this mounting plate 26. Your suction nozzle 28 is with the bottom the cylindrical degassing tank 1 connected. You can see here in the figure 1 located on the right side of the face 29 of the cylindrical degassing container 1, where the supply line or suction line 11 in the degassing 1 is led into it. At the top of the fitting 21 in the supply line 11 is a manometer 19 grown. On the bottom of this fitting includes 21 replaceable dirt filter 5 a. The pressure line 12 of the circulation pump. 3 leads from the pump head 24 back into the circuit 13 of the system. Of the Pump head 24 is equipped with a pressure adjustment screw 25, so so the delivery pressure of the pump 3 is adjustable. At the top of the degassing tank 1 is a breather 4 attached, at the upper end of the gas line 10 via a Check valve 22 is connected. This gas line 10 leads into the adjacent water tank 6 and there acted on the gas pressure from above a float 14. This closes with a float switch one Contact or interrupt this depending on the. In the water tank 6 you can see also the overflow pipe 15. The level in this water tank. 6 fluctuates in operation between the marked minimum and maximum. at Below the minimum water must be refilled, which is manual here has to be done. The device is equipped with a control unit 23, which processes the signals of the contact switch 9 and corresponding to the Pump 3 controls. In a particularly advantageous embodiment as shown in FIG. 2 was introduced, the make-up of water is done automatically. These too Functions are then monitored and controlled by the control unit 23. On the other hand, if the level exceeds the maximum, then flows Excess water over the overflow pipe 15 to the outside.

FIG. 4 shows a view of the degassing vessel 1 of the device according to Figure 3, but in the position of the device shown in this figure 3 seen from the left. So you can see the cylindrical degassing container. 1 from the side in a longitudinal section, so that the look inside is released. The peculiarity of the whole degasser is that the Degassing with such a compact degassing 1 is feasible, the as shown here only 72mm in the inner diameter and 190mm in length measures and has a content of only about 0.5 to 0.7 liters. To be efficient To achieve degassing with such a very small degassing tank 1, is the shape and the arrangement of the injection nozzle 2, as well as the placement of Deaerator 4 of great importance. It should have a relatively large water surface be present and during injection of the gas to be degassed to a good turbulence of the same can be achieved. To achieve this is in one horizontally arranged tubular container with two-sided end faces 29,30 the one end face 29 above the central axis of an injection nozzle. 2 built-in. It is important that the jet of injected from the injector nozzle Water is a bundled, sharp, that is sharp-pointed ray. The beam thereby bounces against the opposite wall 30 of the degassing container. 1 does not catch the water in the degassing vessel 1 and injects it a page. This would namely exposed the suction of water and the Pump would even suck in air. The injection effect by impact of the thin Beam on the opposite wall 30 causes a whirling up of the entire Water surface 20 in the degassing tank 1. Due to this impact on the Rear wall 30 of the degassing tank 1, the water parts are atomized what leads to an increased outgassing. Very important is the arrangement of the Outlet 37 to the breather 4. This must be slightly above the injector 2 be offset backwards, so that its central axis slightly behind the Nozzle mouth is located. Thereby, the breather 4 by the injector immediately emptied if there is some water in it. This is also the Area where, when filling the degassing tank 1 to last an empty space remains exist in which collect the gases and unhindered in the breather. 4 reach. Only when the water flows after the free gases on the Breather 4 excreted.

By this efficient degassing is only a negative pressure in the container of -0.2 to -0.5 bar needed and still it will be an excellent outgassing reached. The pressure values for the operation are at the Druckeinstellschraube 25th adjustable. That the operation of this device only with very little Suppressing, additionally brings the advantage that the pump 3 is not in a cavitation area comes and thus spared. To the vacuum not to drop below -0.5 bar, this is electronically from the Control unit 23 controlled. The negative pressure is in the version with automatic water refilling by means of a pressure sensor and the Version without automatic water make-up by means of a pressure switch 39 measured. When used with the pressure switch 39 is the through Pump generated vacuum monitored by the pump after falling below -0.5 bar is switched off with a time delay. There is a normal degassing cycle from a pump running time of 3.5 min. and a downtime of 1.5 min If the value falls below -0.5 bar, the pump switches off after 1.5 minutes. This time delay is adjustable in a menu of the control unit 23. at the version with the pressure sensor, the shutdown is made staggered. Trigger point is again a negative pressure. At a value of -0.5 bar occurs one first timed period of max. 3.0 min. Running time in force until reaching from -0.65 bar negative pressure. However, if the pressure drops below -0.65 bar, then a second time control activated, which only has a maximum duration of 1.5 Min. When the vacuum reaches a value of -0.8 bar, the pump becomes 3 shut off immediately. These times are also in the menu of the control unit 23 adjustable. The described control has the advantage that at a poor basic setting of the vacuum, or if the set value changed, the device is still running optimally controlled.

The intake manifold 28 to the pump 3 is located just below the injector 2. This is designed so large that always plenty of water for Pump 3 passes, whereby a dry run protection is realized. Im shown For example, the suction line 11 thus opens via the injector nozzle 2 into the upper one Half of the interior of the degassing tank 1. The liquid medium is injected as shown and its beam hits on the opposite end face 30 of the degassing tank 1 on. About the degassing 1 is the breather 4, from which the gas line 10 via a reflux barrier in Form of a check valve 22 into the water tank 1 leads.

In Figure 5, the detailed structure of the float 14 in the water tank 6 shown. This part of the degassing unit assumes the function of Monitoring and registration of pressurized gases. Moreover he monitors the water level in the water or feed tank 6. Der Float 14 is this at an inlet 31 for the incoming gas with parallel thereto anti-rotation pin 32 vertically displaceable guided. The inflow pipe 31 and the anti-rotation bolt 32 are at a Retaining plate 33 is mounted, which is mounted in the interior of the water tank 6. One Reed switch 34 is also attached to the support plate 33 and acts with a Permanent magnet 35 together, at the top of the float 14th is mounted.

The gas-carrying inlet pipe 31 of the gas line 10 from the breather to Float switch is so small dimensioned, in the order of approx. 2.0mm diameter, the gases at a high speed in the Base hole 38 of the float 14 and reach this even at very small Press gas still down. Will the float 14 when flowing out Moving down about 1mm or more, this is registered by the reed switch 34 and sends its signal to a control unit 23, which it further processed. The second function of the float 14 is as follows Float 14 due to lack of water in the water tank 6 not so far can go up to close the contact in the reed switch 34, a Alarm condition caused. The one opened at a due Nachfüisung Solenoid valve is closed. This will cause a suction of air in the Degassing tank 1 prevents. The alarm will also be triggered if in the Supply the power line an error has occurred. So it is with this system imperative that there is always a certain water level in the vessel 6, namely, first to accurately register the gas content and secondly to a Suction of air at a possibly defective backstop 22 in the breather 4 to avoid.

The operation of this apparatus will now be explained in detail and explains. The pump 3 with integrated pressure control delivers water from the Degassing tank 1, which creates a negative pressure in this. Once a Pressure difference between the interior of the degassing tank 1 and the Plant system is created, the water begins in the intake 11 via the injection nozzle 2 to flow into the degassing tank 1. That by the Nozzle 2 inflowing water reaches a high due to the nozzle 2 Speed and a jet effect arises. After Bernoulli's Flow law thereby arises in the jet and also over the nozzle 2 stronger negative pressure, the very fast the breather 4 of any in it emptied existing water. Because of the pump power more water out the degassing vessel 1 is sucked as water through the injection nozzle. 2 flows in anyway creates a negative pressure in the degassing 1. By a Regulation of the pressure adjusting screw 25 on the pump head 24 becomes a achieved uniform flow in the negative pressure of the water to be degassed. The small length of the degassing tank 1 causes the water jet bounced on the inside of the end face 30 while a strong turbulence the water particles generated. Additionally comes with sinking water level in the Degassing tank 1, the effect of the nozzle 2 to carry on the yes not yet degassed water is injected. Due to the impact on the front side 30 the water particles are atomized, with the gases from the water be excreted. This entire package of measures and effects increases the performance of degassing and allows operation with a very small degassing vessel 1 having a content of less than one as shown Liter. Even with this small degassing tank 1 can take up to 5 minutes without Interruption be degassed. Thereafter, the circulation pump 3 for 1½ minutes shut off to expel the released gas through the breather 4. The Condition of the circulation pump 3 allows only a minimal backflow of Water too. But this reflux is sufficient to cope with any gases collected in the pump head 24, return to the degassing tank 1 allow. However, the majority of liquid flows after stopping the Circulation pump 3 via the injection nozzle 2 in the degassing tank 1 after what in turn causes a pressure increase in its interior. Once a pressure increase is exceeded by +0.01 bar in the degassing tank 1, all free gases through the breather 4, the check valve 22 and the gas line 10th directed into the water tank 6. The over this gas line 10 in the Water tank 6 flowing gases now act with the float 14 in Water tank 6 together. That under pressure and with increased speed namely flowing gas pushes the float 14 in the container 6 after below, if the gas volume is large enough. This movement of the float 14 is registered by means of the contact switch 9. Remains the contact switch 9th Closed for a long time, so there is no degassing and the gas content in Circuit 13 is therefore harmless. At the same time prevents the water mask around the float 14 and the mouth of the gas line 10, a suction of air in the degassing tank 1, which would otherwise cause a false gas measurement, if the check valve 22 leaks. The buoyancy of the floating body 14 depends on the height of the water level in the container 6, and this Buoyancy is used to determine the shutdown of the device. Sinks the level far, the buoyancy is reduced and already a low gas flow the gas pipe 10 is able to push the float 14 down and the Disconnect contact switch 9. The float 14 is always complete immersed in water.

The version with automatic water supply is a connecting cable 17 with integrated magnet 45 and a check valve 16 between the water tank 6 and the degassing tank 1 available. Moreover if a refill valve 7 with float 36 is installed in the container 6, through the line 8, if necessary, cold water from the power line to flow can. By means of the automatic make-up will always be consistent Ensures water level in the container 6, which ensures that the buoyancy of the floating body 14 is always the same. The float 36 of the refill valve 7 itself also has the additional function of monitoring the water level. If, for some reason, the water level falls below the minimum, it will the refilling process and degassing interrupted. Same monitoring has the device without water make-up when it falls below the minimum water level, for example due to evaporation.

With this system of the gas guidance it does not matter whether in case of a leaking Check valve 22 on the breather 4 about a small amount of water from the Water tank 6 is sucked in, or if about condensation over the breather 4 is eliminated with. The gas measurement will nevertheless always be correct. As probably the most important feature of this degassing is to mention that no Regulators such as solenoid valves, pressure control valves, throttle valves or Apertures are required for the function of degassing. The device is thus greatly simplified compared to the known solutions and also considerably compact. Their simple construction helps them to a very high operational safety, because none of the installed elements are prone to failure, and also of course, the simple construction allows the device to be cheaper than to produce existing solutions.

Claims (9)

1. A device for degassing fluids in a closed or open circuit (13), consisting of a degassing container (1) with a supply conduit (11) and a bleed device (4) and a gas conduit (10) connecting thereto and a circulatory pump (3) for suctioning medium via a suction union (28) from the lower region of the degassing container (3) and for feeding it back into the circuit (13), characterised in that the single feed conduit which leads from the circuit (13) into the degassing container (1) consists of a pure supply conduit (11) without any type of control elements, which in the upper half of the degassing container (1) opens into the inside of this via an injector nozzle (2), and the gas conduit (10) opens in an associated water container (6) applied on the upper side of a float (14) which is mounted therein in a vertically movable manner.
2. A device according to claim 1, characterised in that the degassing container (1) is formed by a lying cylinder with front sides (29, 30), whose volume is less than one litre, and that the injector nozzle (2) is installed in the upper half of the one front side (29) and is directed towards the opposite front side (30), and that the suction union (28) of the suction conduit (12) of the degassing container (1) is led out from below the nozzle (2) through the cylinder wall out of the degassing container (1), and the gas conduit (10) is led out from above the nozzle (2) through the cylinder wall out of this.
3. A device according to one of the preceding claims, characterised in that the degassing container (1) forms a lying cylinder with an inner diameter of less than 100 mm.
4. A device according to one of the preceding claims, characterised in that the float (14) is mounted in the water container (6) on a retaining plate (33) in that the gas-leading inflow pipe (31) of the gas conduit (10) from the bleed device (4) to the float (14) leads into a vertical base bore (38) of the float (14), and the retaining plate (33) is equipped with a reed switch (34) with which the float (14) forms a contact switch (9), and that a memory-programmable control unit (23) with a menu and display is present in which the signal of the contact switch (9) may be processed so that a degassing cycle of a settable pump running time and pump standstill time may be operated.
5. A device according to one of the preceding claims, characterised in that the float (14) in the water container (6) is mounted on a retaining plate (33) which is equipped with a reed switch (34) with which the float (14) forms a contact switch (9) in that a permanent magnet (35) is present on the upper side of the float (14) and cooperates with the reed switch (34) which is arranged in the retaining plate (33) of the float (14).
6. A device according to one of the preceding claims, characterised in that for preventing an increase in pressure or a reduction of the vacuum in the degassing container below the value of -0.5 bar, the memory-programmable control unit (23) is connected to a pressure sensor in the degassing container (1), so that the pump may be switched off after several time-controlled periods.
7. A device according to claim 6, characterised in that for preventing an increase in pressure or a reduction of the vacuum in the degassing container (1) below the value of -0.5 bar, the memory-programmable control unit (23) is connected to a pressure sensor in the degassing container (1) so that with a value of -0.5 bar, a first time-controlled period may be activated, and on reaching -0.65 bar vacuum a second time control may be activated, and after reaching -0.8 bar the pump may be switched off.
8. A device according to one of the claims 1 to 5, characterised in that for preventing an increase in pressure or a reduction of the vacuum in the degassing container (1) below the value of -0.5 bar, after falling short of (below) -0.5 bar, the pump may be switched off in a time-delayed manner by way of a pressure switch (39).
9. A device according to one of the preceding claims, characterised in that the circulatory pump (3) comprises a pump head (24) with a pressure setting screw (25) and a dirt filter (5).

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