GB2190308A - Apparatus for application of multi-component compositions - Google Patents

Apparatus for application of multi-component compositions Download PDF

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Publication number
GB2190308A
GB2190308A GB08610968A GB8610968A GB2190308A GB 2190308 A GB2190308 A GB 2190308A GB 08610968 A GB08610968 A GB 08610968A GB 8610968 A GB8610968 A GB 8610968A GB 2190308 A GB2190308 A GB 2190308A
Authority
GB
United Kingdom
Prior art keywords
sprayer
components
pumps
spray nozzle
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08610968A
Other versions
GB8610968D0 (en
Inventor
Viktor Vasilievich Glebov
Arkady Alexeevich Buravtsov
Vladimir Alexandrovich Gordeev
Leonid Avrumovich Gornik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MO N PROIZV OB MEKH
Original Assignee
MO N PROIZV OB MEKH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CH1752/86A priority Critical patent/CH665965A5/en
Application filed by MO N PROIZV OB MEKH filed Critical MO N PROIZV OB MEKH
Priority to DE19863615316 priority patent/DE3615316A1/en
Priority to GB08610968A priority patent/GB2190308A/en
Publication of GB8610968D0 publication Critical patent/GB8610968D0/en
Publication of GB2190308A publication Critical patent/GB2190308A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B05B12/087—Flow or presssure regulators, i.e. non-electric unitary devices comprising a sensing element, e.g. a piston or a membrane, and a controlling element, e.g. a valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1418—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet for supplying several liquids or other fluent materials in selected proportions to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device

Landscapes

  • Nozzles (AREA)
  • Accessories For Mixers (AREA)

Abstract

A spray coating apparatus especially for dispensing two part foaming compositions comprises two hydraulic diaphragm pumps (1) having regulators (2) for adjusting pressure of a working fluid (3), and a sprayer (5) having a spray nozzle connected, through delivery lines (4), to discharge pipes of the pumps (1). Each delivery line (4) comprises a restrictor (6) such as a spray nozzle or a pierced washer. The invention may be used in the construction industry for protecting structural members against corrosion, heat and sound insulation, etc. <IMAGE>

Description

SPECIFICATION Apparatus for application of multicomponent compositions The invention relates to the field of coating application, and more specifically it deals with an apparatus for application of multi-component compositions.
The invention may be used in the construction industry, mechanical engineering, municipal economy and in other industries for application of coatings to various surfaces so as to protect structural elements against corrosion, for heat- and sound-insulation of rooms and also for sealing joints between adjacent members and for filling voids.
Known in the art is an apparatus for spraying two component compositions such as foamed polyurethane, comprising two coupled piston pumps having a common pneumatic drive motor and flexible hoses connected to an internal mixing spray gun. In this apparatus components are metered by choosing pump pistons of different diameters depending on the desired metering ratio.
The disadvantage of such apparatuses resides in the fact that it is necessary to disassemble and assemble the apparatus for replacing pump pistons when changing over for compositions with a different ratio between components. In addition, there are substantial limitations as to the range of compositions that can be applied because it is not possible to have pistons of various diameters to cover the whole range of eventual materials because the ratio between components may largely vary.
Also known in the art is an apparatus for application of two-component compositions, comprising a pair of diaphragm pumps, each having a working fluid pressure regulator, a sprayer having a spray nozzle, and delivery lines connecting the sprayer to discharge pipes of the pumps. Components are metered infinitely in this apparatus in the range of minimum to maximum delivery rate of the pumps of 1:1.
The apparatus is simpler in manufacture but its serious disadvantage resides in the fact it can only function with an external mixing sprayer, i.e. with a sprayer in which the components are mixed in the spray after escaping from the nozzle. The experience, however, shows that this mixing of components is rather ineffectual and is not suitable, e.g., in applying foamed polyurethane.
When the pumps work with an external mixing sprayer, each of the diaphragm pumps works independently so that pressure regulators can be manipulated to vary the capacity of each pump so as to obtain a desired ratio between the components. If the pumps are used with an internal mixing sprayer, it is practically impossible to obtain a desired ratio between the components as the common mixing chamber of the sprayer will equalize pressure in both delivery lines, and this pressure will be equal to the setting pressure of one of the pressure regulators. A particular feature of the hydraulic diaphragm pumps resides in the fact that pressure in the delivery line is always equal to the pressure setting of the pressure regulator except for a case where the sprayer throughput capacity is equal to, or greater than, the maximum possible capacity of the pump.In case pressure at one of the pumps is increased by setting its pressure regulator respectively, its capacity will also increase with a corresponding pressure increase in the delivery line. This will result in the second pump operation being completely interrupted since its pressure regulator is adjusted to a previous pressure value. It will be apparent that the pumps of this type can only function with an internal mixing sprayer if both pressure regulators have exactly one and the same setting so that it would not be possible to change ratio between the components by using different settings of the pressure regulators of both pumps.
It is an object of the invention to eliminate the disadvantage of the abovedescribed apparatuses.
The invention is based on the problem of the providing an apparatus for application of multi-component compositions built around diaphragm pumps, which is so constructed as to ensure individual metering of components in operation with an internal mixing sprayer.
This object is accomplished by an apparatus for application of multi-component compositions, comprising at least two hydraulic diaphragm pumps each having a working fluid pressure regulator, a sprayer having a spray nozzle, and delivery lines connecting the sprayer to the discharge pipes of the pumps, wherein, according to the invention, each delivery line comprises a restrictor.
The restrictor may be made in the form of spray nozzle or a washer.
Each delivery line preferably has a component flow rate transducer disposed between the restrictor and the sprayer, and the apparatus also comprises a control device having two inputs and an output, and a servo motor connected to one of the working fluid pressure regulators, the inputs of the control device being connected to the component flow rate transducers and the output being connected to the servo motor.
This construction of the apparatus makes it possible to carry out a high-quality coating application to various structural members with a pre-set ratio between components. This ratio can be changed and automatically maintained at the preset level during operation.
The invention substantially resides in the following. The apparatus makes use of an internal mixing sprayer, and restrictors are pro vided at the outlet of each pump to effect a continuous variation of components metering rates in a pre-set ratio between components so that pressure regulators of the pumps can be adjusted independently of one another and any desired ratio between components can be obtained within the limits of actual flow characteristics of the pumps.
A restrictor (or a local resistor) provided in the path of flow of a liquid is known to be used for limiting liquid flow which is ensured by deriving a part of the liquid flow into a drain line, or for creating a pressure difference. In this case, the provision of restrictors is not aimed at limiting the flow of a composition being applied, but is rather designed tor allowing each pump delivery rate to be varied in a desired ratio, no excess of the composition being discharged through a drain line.
The cross-sectional area of the restrictors is preferably chosen in accordance with the cross-sectional area of the spray nozzle and is, e.g., smaller than the cross-sectional area of the spray nozzle. As the pressure setting of the pressure regulators is higher than pressure in the delivery lines connected to the sprayer, the pumps function independently of one another, and a change in pressure in one of the pumps cannot have any effect on operation of the other pump. Therefore the restrictors ensure independent operation of the pumps with the employment of an internal mixing sprayer for application of a coating composition.
The provision of an apparatus with a control device having its inputs connected to the component flow rate transducers installed in each delivery line and the output connected to one of the working fluid pressure regulators ensures selection and automatic maintenance of a pre-set ratio between flow rates of components during operation.
Therefore, the invention allows coating application to be carried out in a better and more economical manner, with the most favourable conditions for metering of components of a coating composition.
The invention will be better understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic view of an apparatus for application of multi-component compositions; Figure 2 is an embodiment of a restrictor of an apparatus shown in Figure 1, in enlargedsectional view; Figure 3 is ditto, another embodiment of a restrictor.
An apparatus which will be herebelow described is designed for application of twocomponent coatings, e.g., foamed polyurethane. It will be apparent that the number of components may be greater than two.
An apparatus shown in Figure 1 consists of two identical units, each comprsing a hydromechanical drive and a diaphragm pump actuated by a working fluid such as oil.
Each unit comprises a hydraulic diaphragm pump 1 having a pressure regulator 2 for adjusting pressure of a working fluid 3, e.g. hydraulic oil. Discharge pipes (unreferenced) of the pumps 1 are connected, via delivery lines 4, to an internal mixing sprayer 5 for spraying components of a composition being applied after their mixing. The sprayer 5 has a spray nozzle (unreferenced) for spraying a composition to a work surface. Each delivery line 4 comprises a restrictor (local hydraulic resistor) 6 which may be made, e.g. in the form of any member which is capable of providing a local restriction of the cross-section of the delivery line 4.
The restrictor may also be made in the form of a reduced portion of the conduit forming the delivery line.
To facilitate manufacture, it is preferred that the restrictor be made in the form of a nozzle 7 (Figure 2) similar to the spray nozzle of the sprayer 5 or in the form of a washer 8 made of any appropriate material having a calibrated orifice (Figure 3), and these elements are installed in any appropriate known manner in the delivery line 4 (Figure 1).
In order to maintain automatically the ratio between components during operation, the apparatus may be provided with component flow rate transducers 9 installed in each delivery line 4 between the restrictor 6 and sprayer 5, and a control device 10 having an output and two inputs which are electrically connected to the component flow rate transducers 9.
The apparatus is also provided with a servo motor 11 operatively connected to the pressure regulator 2 of one of the pumps 1 and electrically connected to the output of the control device 10. The control device 10 may be in the form of a microprocessor or any known electronic system designed for maintaining a pre-set ratio between electrical signals obtained from the component flow rate transducers 9. Upon any deviation from the pre-set ratio between the components a signal of a respective polarity will appear at the output of the control device to control the pressure regulator 2 of working fluid 3 by means of the servo drive motor 11. The component flow rate transducers may be, e.g. in the form of induction transducers.
The control device 10 has a means with a scale 12 for selection of ratios between components of a composition being applied. Each pump 1 has an electric motor 13, a wobbler 14, a plunger 15, a diaphragm 16, a suction valve 17, a discharge valve 18, a relief valve 19, and a filter 20.
The apparatus for application of multi-component compositions according to the invention functions in the following manner.
Before starting operation, the filters 20 are placed into containers with components "A" and "B" (Figure 1), and a desired ratio between the components "A" and "B" is selected on the scale 12 of the control device 10. Then the apparatus is switched on, and oil 3 under pressure created by the plunger 15 of each pump during rotation of the wobbler 14 will impart reciprocations to the diaphragm 16. The components "A" and "B" will be admitted through the suction valves 17 and will be discharged, through the discharge valves 18, to the delivery lines 4 and further to the sprayer 5. If the valves of the sprayer 5 (not shown in the drawing) are closed, pressure of components in the delivery lines will cause the relief valves 19 to open, and the components "A" and "B" will be pumped in a closed circuit back to the respective containers. The apparatus will be idling.When the valves in the sprayer 5 are opened, the relief valves 19 are closed, and the components "A" and "B" will flow through the delivery lines 4 to the internal mixing chamber (not shown in the drawing) of the sprayer 5 and therefrom into atmosphere through the spray nozzle.
When the components of the composition flow through the delivery lines, they act upon the transducers 9, and electrical signals proportional to flow rates of the components "A" and "B" will go to the inputs of the control device 10. If the actual ratio A:B is equal to the ratio between the components set on the scale 12 of the control device 10, there will be no signal at the output of the control device, and the servo motor 11 will not be actuated.
If the flow rate of the component "A" becomes lower for some reason and the flow rate of the component "B" remains the same, the ratio A:B will change, and a signal of a respective polarity will appear at the output of the control device 10. This will result in the servo motor 11 being actuated so as to act upon the pressure regulator 2 of the pump 1 of the unit supplying the component "B"; the pressure will decrease so as to cause a reduction of the flow rate of the component"B".
This decrease will continue until the pre-set ratio between the components A:B is restored. If the flow rate of the component "B" becomes lower, a signal of the opposite polarity will appear at the output of the control device 10, and the servo motor 11 will act upon the pressure controller 2 so that the flow rate of the component "B" might be raised until the pre-set ratio between the components A:B is restored.
It will be apparent from the above description that the apparatus for application of multicomponent compositions ensures a continuous variation of the ratio between components of a composition being sprayed without the influence of adjustment of one pump of the unit on operation of the other pump. This facility makes it possible to work with an internal mixing sprayer so as to ensure high quality of a composition being applied. The apparatus according to the invention also allows the preset ratio between components of a composition being applied to be automatically maintained thus facilitating operation.

Claims (4)

CLAIMS:
1. An apparatus for application of multicomponent compositions, comprising at least two hydraulic diaphragm pumps, each having a working fluid pressure regulator, a sprayer having a spray nozzle, and delivery lines, each delivery line having a restrictor, the delivery lines connecting the sprayer to discharge pipes of the pumps.
2. An apparatus as claimed in claim 1, wherein the restrictors are made in the form of a spray nozzle or a washer.
3. An apparatus as claimed in claim 1 or 2, wherein a component flow rate transducer is provided in each delivery line, between the restrictor and the sprayer, and wherein there are also provided a control device having two inputs and an output, and a servo motor connected to one of the working fluid pressure regulators, the inputs of the control device being connected to the component flow rate transducers and the output being connected to the servo motor.
4. An apparatus as claimed in any of the foregoing claims substantially as hereinabove described with reference to, and as shown in the accompanying drawings.
GB08610968A 1986-05-06 1986-05-06 Apparatus for application of multi-component compositions Withdrawn GB2190308A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH1752/86A CH665965A5 (en) 1986-05-06 1986-04-29 DEVICE FOR APPLYING MULTIPLE MIXTURES.
DE19863615316 DE3615316A1 (en) 1986-05-06 1986-05-06 AGGREGATE FOR APPLYING MULTIPLE MIXTURES
GB08610968A GB2190308A (en) 1986-05-06 1986-05-06 Apparatus for application of multi-component compositions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08610968A GB2190308A (en) 1986-05-06 1986-05-06 Apparatus for application of multi-component compositions

Publications (2)

Publication Number Publication Date
GB8610968D0 GB8610968D0 (en) 1986-06-11
GB2190308A true GB2190308A (en) 1987-11-18

Family

ID=10597383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08610968A Withdrawn GB2190308A (en) 1986-05-06 1986-05-06 Apparatus for application of multi-component compositions

Country Status (3)

Country Link
CH (1) CH665965A5 (en)
DE (1) DE3615316A1 (en)
GB (1) GB2190308A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250894A1 (en) * 2001-04-19 2002-10-23 Alfred Konzett Dosing device for feeding disinfectant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250894A1 (en) * 2001-04-19 2002-10-23 Alfred Konzett Dosing device for feeding disinfectant

Also Published As

Publication number Publication date
DE3615316A1 (en) 1987-11-12
GB8610968D0 (en) 1986-06-11
CH665965A5 (en) 1988-06-30

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)