DE19811482A1 - Priming system for water jet pump - Google Patents

Abstract

In a water jet pump priming system, a predetermined adjustable pressure head is created by provision of suitable fittings or changes in the outflow piping system. Preferably the pump is fitted with a membrane (6), which has a segmented face extending into the outflow system (8) and which can comprise any material, preferably a soft plastic material. The pump outflow system preferably has a constriction, more preferably in the form of a metal ring, or the pump outflow system has a syphon-like design designed to create an adjustable pressure head.

Description

The invention relates to a system and a method that make it possible for mortaring of screed, concrete, plaster or other dry mixes, hereinafter referred to as mix, in continuous mixers with the mixing water that was previously based on the water jet system pump with metered air or gas and one or more metered doses liquid additives has been enriched, mortarized to an essentially processed ready-to-use mortar with a definable air pore content that can be conveyed using a mortar pump is, the introduction of the mixing water enriched with air and additives against the Internal pressure of the mix in the mortar mixing zone of the continuous mixer or the mixing pump without any external support or additional compressed air.

So that the mortar produced in continuous mixers from mixed material and mixing water is suitable for the If the required quality is achieved for each application, it needs a certain, different amount of evenly distributed air pores. The homogeneous distribution of all materials such as air pores, Adhesion improvers, color pigments etc. have an advantageous effect on the mortar mixture and the end product arrested. Air pores improve the quality of products, make them easier to process and process, reduce material requirements and reduce costs. The air pore formation of the mortar takes place by mortaring the mix. Among other things, there are mixers for the amount of air pores Type, mixing tool and especially the mixing time in contact with air or gas are decisive. Suitable powdery or liquid additives support and stabilize the pore formation. There liquid additives do not first have to be digested by water, their effect takes place when mortaring faster, especially if it is in part or all of the water are distributed homogeneously.

The mortar of the factory-mixed mix is usually carried out continuously working continuous mixers and mixing pumps. Continuous mixers basically consist of  a pipe, at one end of which the mix is continuously fed through the screw conveyor presses and the mixing water with reduced tap water pressure of 1.0 to 2.5 bar a certain distance is continuously and synchronously fed laterally. The mortar by means of a suitable mixing tool inside the pipe in the mortar mixing zone a few seconds essentially with the exclusion of air, the at the other end of the tube Mortar is made ready for processing. Through the mortar in one go Mixing with the exclusion of air reach these mortars despite the increased addition of suitable air pores not the required, calculated proportion of air pores and the desired quality for the intended mortar insert as air-entrained mortar.

If at the pipe end of the continuous mixer, driven by the mixing tool, a Schnec kenpumpe is connected, the system is called a mixing pump and forms a closed system.

The mortar is transported from the mortar mixer to the place where the mortar is needed Various feed pumps such as piston and screw pumps using a flexible feed loop chen. The screw pumps can have their own open reservoir as their own System, so-called feed pumps, be supplied to a continuous mixer.

Continuous mixers, feed and mixing pumps must be used due to their use and the part wise hourly changes of location are accordingly small, compact and mobile. The by ange closed devices generated compressed air is required to apply the mortar.

There are various methods for enriching the mortar with air pores on a larger scale known. Because in the case of the continuous mixers and mixing pumps described, the hydrophobic mixture is well pressed into the mixing tube by means of a screw conveyor, it is necessary that the mixing water under a correspondingly higher pressure into the mix in the mortar mixing zone of the pass mixer or the mixing pump is pressed.

In the in DE 29 18 451 C2, DE 29 18 451 A1, DE 87 17 427 U1 and in the the US 27 24 583 described method is based on the principle of the water jet pump Propellant sucked in a medium (sprayed into a mixing chamber via nozzles), which mixes with the  Air flowing into the mixing chamber via side openings to a corresponding one Mixture or foam swirled, which is made available to the mixer. This procedure are not suitable for continuous mixers and mixing pumps because of the side openings in the mixing chamber the pressure of the foam mixture is insufficient to counter the pressure in the To overcome mortar mixing zone of the continuous mixer or the mixing pump and thereby Foam mixture can not be pressed into the mix.

DE 31 32 667 A1 describes a system in which the principle of the water jet pump a liquid foaming agent is added to the water in a controlled manner and, using compressed air at 1.4 bar foamed, fed to the mixer. Even if the processed foam turns into a through feed mixer could be added and mixed, this system is not suitable because the corresponding Compressed air is not available, and the system size due to the size of the system is unsuitable for the mobile continuous mixers and mixing pumps described. That too in the Process described in DE 32 22 032 A1, in which mortar with compressed air of 5 to 40 bar above in attached perforated plates locked to the pipeline is not suitable because pipeline can not be used for the intended purpose. In addition, this is also System due to the lack of compressed air and the clogging of the air openings by the current Inappropriate work breaks.

The method described in DE 21 17 000 has not proven itself, requires additional Compressed air and is surface-active due to uneven enrichment of the mixing water Substances as well as clogging of the fine openings through the mortar when working under refractions not suitable.

DE 195 07 366 A1 describes a method in which essentially one batch of solid and a batch of liquid in a quasi continuous mixer are mixed, with a special air pore enrichment with the described system is not reached and is provided, so that due to the plant and its size, the system for the intended use is not suitable.

In the patent application 197 12 936.2 a system and a method is described, which on the The basis of the water jet pump doses air and that in the vacuum chamber further liquid additives can be added. Because the plant with unfavorable water pump or nozzle size, low water pressure, small water flow rate and often  changing installation position (with mobile continuous mixers and mixing pumps) not always or starts immediately, this system is also not completely satisfactory. On the priority of this registration being point out.

All systems and processes described for the additional, metered introduction of air and / or other additives are not suitable for the intended purpose or only achieve them unsatisfactory results.

They are only for open mixing systems, special mortar, certain devices, only with additional ones Compressed air devices or only suitable for the entry of liquid additives or air. she can not or only unevenly dose, tend to clog in the air / mortar area and gluing, require additional provision of compressed air, special control or are so extensive that they are stationary but not in the described small, portable Continuous mixers and mixing pumps can be used.

The invention has for its object a method and a system with a simple, appera To provide tive effort without additional energy or controls, an economical Finding a solution when mortaring the mix with partial or complete exclusion of air dosing the proportion of air pores even with continuous mixers and mixing pumps with a short mixing time bar to increase, the efficiency of the additives to accelerate and the effectiveness To improve the lower dosage, the enriched mixing water with the necessary higher pressure without additional equipment or additional energy against the pressure of the mix press good into the mortar mixing zone of the continuous mixer or the mixing pump.

According to the invention, this object is achieved by the features of the method according to the patent claims 1 and a system according to claim 5 and the further subclaims.

Advantageous further developments result from the subclaims and from the appended claims schematic sketches.

In terms of the method, this object is achieved according to the invention in that it is carried out continuously mixer or the mixing pump mixed mortar at a higher pressure with the exclusion of air the meterable air required for the use of the mortar and possible further meterable air  liquid additives in a predeterminable and repeatable amount homogeneous in the beginning mixed water can be mixed, which means that even with the shortest mixing time Efficiency of the additives improved and the even distribution of the air pores in the mortar is guaranteed, with the introduction of air and possible additives in the line water clogging of the air and additive nozzles is excluded.

The system according to the invention is built on the basis of a water jet pump, which, from Tap water pressure operated, metered air that sucks in the system by its own pressure or several liquid additives can be metered in, which are in the mixing and Swirling expansion chamber into a homogeneous mixing water mixture, which is created by the first pressure in the mix in the mortar mixing zone of the continuous mixer or the mixing pump is pressed. The Lei ensures that the liquid additives are fed in synchronously water pressure in front of the nozzle is controlled by the attached membrane switch. A special, the system downstream starter ensures that the starting of the system even when unfavorable Plant or nozzle size, low flow or pressure of tap water and un own or changing position of the system. By appropriate, replaceable The meterable air and additives are controlled by nozzles and additional metering valves.

Some of the main advantages of the invention are listed below:
The most important advantage of the invention is that the system is controlled and operated completely independently of the existing continuous mixer or the mixing pump, only from the tap water pressure, which can also be less than 2.0 bar, in order to do this with metered air and metered liquid To press admixed mixing water into the mix of the mortar mixing zone of the continuous mixer or the mixing pump or to make it available for another use, whereby any blockage of the nozzles is avoided by the enrichment via the mixing water. The meterability of air and liquid additives makes it possible for the first time to determine the proportion of air pores in the mortar, which can be predetermined and repeated at any time, so that the quality of the mortar can be restored at any time and thus complies with the required quality assurance.

Another advantage is the small size and the simple installation of the system and its installation without any changes to the continuous mixer or the mixing pump by simple Intermediate closing in the mixing water supply hose without any tools usual and existing couplings. The installation does not require any knowledge and that System no maintenance. An additional inlet opening after the preparation of the mixing water enables further addition and mixing of paint or other liquid media through appropriate own pressure.

A major advantage of the system is that the possible, homogeneous addition tion of liquid additives the use of the powdery additives used at the factory the air void fraction of the mortar can be reduced significantly or completely rotary mixers and mixing pumps that were obtained in the laboratory for the technical values of the mortar underlying properties achieved and by additional increase in the proportion of air pores new and further areas of application of mortar from continuous mixers and mixing pumps be opened.

It is advantageous that the synchronous metering to the mixing water without special control or separate energy is carried out by the system and that through interchangeable nozzles Connection with a special starter is already a system size for the use of common through running mixer is sufficient, because the special starter even with low water flow or low ensures that the system starts up according to tap water pressure.

Even this short and incomplete list shows that the invention is the simplest Extensive and essential mortar in a way that is inexpensive and requires little investment improvements as well as material and cost savings can be achieved.

The invention is described below with the aid of two execution systems, one below the other can also be combined, described with reference to the accompanying drawings. Attention is drawn to the priority of patent application 197 12 936.2.

Fig. 1 shows schematically a system that doses air independently, whereby another additive from a higher-lying container, controlled synchronously by the membrane switch, can be dosed to the vacuum chamber and both media are mixed with the water in the mixing chamber to form an evenly enriched mixing water , as well as the arrangement of the downstream starter.

Fig. 2 shows schematically a system in which two systems are connected in parallel, one metering the air, sucking in independently, the second metering an additive from a deep-lying container, mixing all media in the system evenly to enriched mixing water and the arrangement of the downstream starter.

FIG. 3 schematically shows the membrane switch indicated in FIG. 1 by 20 in detail and in the open position.

FIG. 4 schematically shows the membrane switch indicated in FIG. 1 with 20 in detail and in the closed position.

Fig. 5 shows schematically one of the indicated in Fig. 1 with 35 , consisting of more than two segments, disc-like starter, which is connected directly downstream of the system, is arranged in the outgoing line of the mixing water.

FIG. 6 schematically shows one of the disk-like starters indicated in FIG. 2 by 37 , which is designed in the manner of a washer, has various incisions and is arranged at a short distance from the system in the outlet line of the mixing water.

In the system shown in FIG. 1, the tap water 1 , reduced in pressure, is metered and controlled by the existing continuous mixer or the mixing pump, by means of a hose 2 into the system 3 and through the exchangeable nozzle 4 into the vacuum chamber 5 . Here, air is drawn in from the tap water 1 via the line 6 and a liquid additive is fed from the container 14 via the line 7 to the negative pressure chamber 5 by means of its own downward pressure and passes through the narrowing into the mixing and expanding chamber 8 as evenly enriched with air and additive Mixing water 9 . The mixing and expanding chamber 8 is connected to a starter 35 for faster starting at low differential pressure or the position of the system in the mixing water supply line 10 . Through the feed line 10 , after passing through the fine screen 12 , coupling connection 11 , the mixing water 9 is passed on to the mortar mixing zone of the continuous mixer or the mixing pump 13 with a correspondingly higher pressure. In the feed lines 6 and 7 are the suitable screens 15 and interchangeable flow restrictors 18 , which are supported by additional metering valves 16 . In the supply line 7 is a controlled by the reduced pressure of the tap water 1 membrane switch 20 , which releases the synchronous addition of the additive only when the tap water 1 flows through. In the mixing and expanding chamber 8 there is a connection 19 through which, independently of the system 3, dixotropic additives such as paint or the like can be sprayed in with the appropriate pressure.

In the system shown in FIG. 2, the tap water 1 , which is reduced in pressure, is metered and controlled by the existing continuous mixer or the mixing pump, by means of hose 2 into the two systems 3 and through the exchangeable nozzles 4 into the vacuum chambers 5 . Here, from the tap water 1, air is fed via the line 6 , a liquid additive from the lower-lying container 14 after passing through the sieve 15 via the line 7 through the suction of the tap water 1 to one of the vacuum chambers 5 and passes through the constrictions into the mixing and Expanding chamber 8 as evenly enriched mixing water 9 . The mixing and expanding chamber 8 is followed by a starter 37 for faster starting with a low differential pressure or an unfavorable position of the system in the mixing water supply line 10 . Through the feed line 10 , after passing through the fine screen 12 , hitch be connection 11 , the mixing water is forwarded to the mortar mixing zone of the continuous mixer or the mixing pump 13 with a correspondingly higher pressure. In the feed lines 6 and 7 there are suitable screens 15 and interchangeable flow restrictors 18 , which are supported by additional metering valves 16 . In the mixing and expanding chamber 8 is a connection 19 through which 3 dixotropic additives such as paint or the like can be sprayed with a suitable pressure regardless of the system.

In Fig. 3, 1 is the tap water reduced in pressure and 3 the system to which the membrane switch consisting of parts 23 and 24 ( Fig. 1. 20 ) is connected. The membrane 25 acted upon by the tap water 1 is clamped between the parts 23 and 24 . The parts 23 and 24 are firmly pressed together by a union nut 26 (clamping ring or the like.), The membrane 25 serving as a seal. The membrane 25 is at its center connected to the pressure plate 27 , on the shear-resistant connecting rods 28 , the squeeze surface 29 is fixed. The flexible supply hose 7 for the additional liquid additive to be metered in is passed through the adjustment openings 32 between the squeeze surface 29 and the abutment 30 . The compression spring 33 is arranged between the abutment 30 and the pressure plate 27 with a corresponding preload. When incoming tap water 1 is compressed by the membrane 25 and pressure plate 27, the compression spring 33 , whereby the shear-resistant connecting rods 28 lifts the squeeze surface 29 from the abutment 30 and the inflow of liquid additive from the container 14 through the flexible supply hose 7 to the vacuum chamber 5 of the system 3 opens.

FIG. 4 shows the membrane switch described in FIG. 3 in the closed state. In the absence of tap water pressure 1 , the membrane 25 is pushed back by the compression spring 33 preloaded between the pressure plate 27 and the abutment 30 , as a result of which the shear-resistant connecting rods 28 press the squeeze surface 29 against the abutment 30 and the inflow of the additional liquid additive from the container 14 through the flexible feed hose 7 to prevent vacuum chamber 5 by squeezing.

In the Fig. 5, 35 of the illustrated in Fig. 1 disc-shaped starter in plan view, comprised of a corresponding flexible material, forms a closed surface in the resting state generates a certain back pressure with inflowing mixing water, the immediate onset of the plant and thus the immediate suction power is reached, the individual segments 36 of the starter opening and not obstructing the mixing water outflow.

In Fig. 6 37 is the disc-shaped starter shown in Fig. 2 in plan view, which consists of appropriate flexible material, in the idle state forms a surface with a round cut-out 38 in the middle, generates a certain back pressure when the mixing water flows in the immediate start of the system and thus the immediate suction power is achieved, the individual segments 39 of the starter opening and not obstructing the outflow of the mixing water.

Claims (10)

1. A method for the metered, uniform mixing of air and liquid additives in mortar, concrete and other mixtures, characterized in that air is metered in using the principle of the water jet pump and at least part of the reduced tap water, which is sucked into the vacuum chamber flow one or more liquid additives into the system and mix it from the water in the downstream mixing and expanding chamber to an enriched mixing water, which is pressed into the mix in the mortar mixing zone of the continuous mixer or the mixing pump with correspondingly higher pressure,
that the system is connected to a membrane switch operated by tap water pressure, which synchronously controls the supply of additional liquid additives flowing in with its own pressure, in that the membrane opens the supply line 7 through the membrane switch when the tap water is pressurized by lifting the squeezing device, or closes in the absence of tap water pressure using the squeeze device,
that a starter downstream of the system ensures the immediate suction power (starting) of the system even with a small amount or low differential pressure of the tap water and after work breaks. 2. The method according to claim 1, characterized in that the mixing and expanding a closed chamber up to the mortar mixing zone of the continuous mixer or the mixing pump Pipe system exists in which a corresponding dynamic pressure arises, so that the enriched Mixing water is injected into the mix at a higher pressure than that in the mortar mixing zone is, the pressure difference between the mortar mixing zone and reduced tap water pressure can be less than 2.0 bar. 3. The method according to claim 1, characterized in that the metering of the intake air by means of interchangeable flow limiter 18 or metering valve 16 is preferably carried out by changing the tap water pressure 1 or the interchangeable nozzles 4 . 4. The method according to claim 1, characterized in that the metering of additional liquid additives by means of interchangeable flow limiter 18 or metering valve 16 is preferably carried out by mixing the liquid additive with neutral liquid. 5. Plant for the enrichment of the mixing water for the production of mortars with determinable and metered air pore content for performing the method according to claim 1 to 4, characterized in that the vacuum chamber of the plant has at least one additional opening to which a feed line for additives flowing with its own pressure can be connected
that the system is connected to an additional, replaceable membrane switch 20 operated by tap water in front of the nozzle 4 ,
that a starter is connected directly to the system, but can also be installed in the mixing water drainage system at a short distance after the system. 6. Plant according to claim 5, characterized in that the membrane switch consists essentially of two half-shells, of which the membrane is held, which simultaneously serves the two half-shells as a seal, the membrane being connected to the squeezing device by means of corresponding connec tion parts and between the membrane pressure plate and abutment a compression spring with calculated preload is installed, which presses the supply line 7 in the absence of pressure 7. Plant according to claim 5, characterized in that in the mixing and expanding Chamber is a connection option, through the additional additives or dixotropic media how color slurry or the like can be initiated with appropriate pressure. 8. Plant according to claim 5, characterized in that the starter 37 consists of a rigid or correspondingly flexible transversely installed in the flow disc which has an adapted round cutout opening, the closed surface is preferably divided into individual segments which bend up with a larger flow of mixing water and thus the round opening is enlarged. 9. Plant according to claim 5, characterized in that the starter 35 consists of a, with certain flexibility equipped disc, which is divided into more than two segments, generates a low dynamic pressure, which ensures that the system starts, but accordingly the flow rate of the mixing water opens and enables unimpeded flow. 10. Plant according to one of claims 1 to 5 and 7 to 9, characterized in that two or more systems are connected in parallel and the funding of the additive from the deeper containers made by a separate system.