EP0440179A2 - Pistolet de pulvérisation pour liquides - Google Patents

Pistolet de pulvérisation pour liquides Download PDF

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Publication number
EP0440179A2
EP0440179A2 EP91101173A EP91101173A EP0440179A2 EP 0440179 A2 EP0440179 A2 EP 0440179A2 EP 91101173 A EP91101173 A EP 91101173A EP 91101173 A EP91101173 A EP 91101173A EP 0440179 A2 EP0440179 A2 EP 0440179A2
Authority
EP
European Patent Office
Prior art keywords
spring
spray gun
compensation wall
nozzle valve
liquid
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Withdrawn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
EP91101173A
Other languages
German (de)
English (en)
Other versions
EP0440179A3 (en
Inventor
Berthold Dr. Daimler
Hans-Gerd Dr. Eckel
Willi Schweikert
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.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0440179A2 publication Critical patent/EP0440179A2/fr
Publication of EP0440179A3 publication Critical patent/EP0440179A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/08—Apparatus to be carried on or by a person, e.g. of knapsack type
    • B05B9/085—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump
    • B05B9/0877—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump the pump being of pressure-accumulation type or being connected to a pressure accumulation chamber
    • B05B9/0883—Apparatus to be carried on or by a person, e.g. of knapsack type with a liquid pump the pump being of pressure-accumulation type or being connected to a pressure accumulation chamber having a discharge device fixed to the container

Definitions

  • the invention relates to a spray gun for liquids, comprising a manually operable nozzle valve, a manually operable liquid pump with an inlet and an outlet valve and a spring accumulator between the outlet and the nozzle valve.
  • Such a spray gun comprises two functional units connected by a hose line, one of which only comprises the nozzle valve and the other a transport container for the liquid to be sprayed which is to be carried on the back and in which the liquid pump and the spring accumulator are additionally arranged.
  • the spring accumulator consists of an air cushion which, depending on the volume of liquid fed in, experiences a more or less large compression.
  • the liquid pressure available at the nozzle valve is therefore subject to large fluctuations, which adversely affects the quality of the spray resulting from an actuation and favors the formation of liquid drops of a different size and speed.
  • the modules included are also of considerable size. A miniaturization to improve the handiness is excluded.
  • spray cans are used in which the liquid pressure available at the nozzle valve is of approximately the same size during the entire emptying phase. This results in the resulting spray pattern of great uniformity. However, it is based on the use of propellant gases in the spring mechanism, which are not considered to be environmentally friendly. In addition, the uniform spray pattern is lost at low temperatures.
  • the invention has for its object to develop a spray gun for liquids that can be used similarly to a spray can and that makes it possible to generate a spray of balanced droplet size and velocity largely independently of temperature fluctuations.
  • the spring accumulator is limited at least in a partial area by a compensation wall which is resiliently supported on a prestressed spring, the spring being mounted in such a way that there is no significant change in the spring force when the compensation wall is displaced.
  • the path of the compensation wall resulting from a displacement can be limited, for example, by stops on both sides, which are assigned either to the compensation wall itself or to the spring.
  • a mechanical spring is used, for example a coiled spring made of metal. This is so biased and matched to the size of the compensation wall that there is always a liquid pressure in the spring accumulator, which ensures optimal spraying of the liquid contained when the nozzle valve is actuated.
  • liquid pressure which, when the liquid emerges from the nozzle, forms droplets of more uniform Size, distribution and speed guaranteed. It is largely dependent on the type of liquid to be sprayed and the design of the nozzle used and can be determined in an experiment if necessary.
  • a suitable liquid pressure in relation to paints and hair fixers is in the range between 8 and 12 bar. It can be achieved using mechanical springs that are small in size. The spray gun according to the invention can thereby be made small and handy.
  • the path of the compensation wall is dimensioned such that the quantity dose escaping from it when the nozzle valve is operated normally is available up to 2 to 10 times.
  • the spray gun can be used similarly to the known spray cans and, if appropriate, in an upside-down position.
  • the spray gun according to the invention is provided with a manually operable liquid pump, which makes it possible to refill the spring accumulator independently of the actuation of the nozzle valve.
  • the liquid pump can be designed as a piston pump, the hydraulically effective cross section being dimensioned such that a very low actuating force of, for example, 10-30 N is sufficient for feeding the liquid into the spring accumulator.
  • the proposed spray gun is also easy to handle by people with lower physical strength, for example by children.
  • the liquid pump can also be designed as a peristaltic pump.
  • a lever ratio ensures that the actuating force can be easily applied.
  • Another version provides for the installation of an electric liquid pump powered by a battery or accumulator. This is started at the push of a button and switches off as soon as the pressure inside the pressure accumulator exceeds the maximum pressure permitted for optimal spraying of the liquid.
  • the spray gun can be provided with aids which indicate the degree of filling of the spring accumulator. It has proven to be particularly expedient if the compensation wall can be placed on the nozzle valve when the spring accumulator is emptied and if the nozzle valve can be closed by the compensation wall. For this purpose, it is only necessary that the nozzle valve is provided with a closing element arranged inside the spring accumulator, against which the compensation wall or a projection thereof bears when the spring accumulator is emptied, thereby causing the closing element to be pressed against its valve seat. The nozzle valve can then no longer be actuated, which signals to the user with sufficient clarity that the spring reservoir needs to be refilled by actuating the liquid pump.
  • At least one disc spring is used for the elastic support of the compensation wall, which has an S-shaped course of the spring characteristic.
  • the steep rise in the spring characteristic curve at the beginning of an elastic deformation is followed by a very wide range in which the elastic deformations do not cause any significant change in the spring force.
  • a change in this regard only occurs with even larger deformations, which in turn result in a steep increase the spring force are accompanied.
  • Only the central area of the spring characteristic is important in the context of the present invention. It is used in which stops are assigned to the plate spring or the compensation wall which is in engagement with the plate spring in such a way that only elastic deformations of the plate spring can occur within the horizontally running range of the spring characteristic during the intended use.
  • the plate spring can optionally form an integral part of the compensation wall, which considerably simplifies the manufacture of the spray gun according to the invention.
  • a plastic in particular a fiber-reinforced plastic, is expediently used for the production of a corresponding structural part.
  • the compensation wall When using a manually operated piston or peristaltic pump as the liquid pump, the compensation wall should have a hydraulically effective area which is 10 to 150 times as large as that of the liquid pump. In addition to a sufficiently easy operability of the liquid pump, sufficient effectiveness in filling the spring accumulator is achieved.
  • a particularly compact design which is reminiscent of the outer shape of spray cans, can be achieved if the spring accumulator, the compensation wall, the spring and the nozzle valve are arranged coaxially to one another.
  • the pump is formed by a piston pump, there is also the possibility of assigning the pump piston to the above-mentioned elements in a coaxial manner.
  • the unpressurized reserve container for the liquid to be sprayed can also be attached to an upper part in the same way as in the known spray cans, which combines the above-mentioned structural parts. A detachable attachment is also possible and allows further use after a first reserve container has been completely emptied.
  • Figures 1 to 3 Three different versions of spray guns.
  • Figure 4 The characteristic curve of one of the plate springs, which are used in the embodiments according to FIGS. 2 and 3.
  • the spray gun shown in FIG. 1 is intended for spraying a liquid contained in a reserve container 16 without pressure, for example a repair spray for automotive paints.
  • the reserve container 16 is of an essentially rotationally symmetrical shape and is fastened to an upper part 17 by a screw connection.
  • a suction pipe 18 is immersed in it, which is fastened to the inlet valve 4 of the manually operable liquid pump 2.
  • the outlet valve 5 of the liquid pump is arranged in the compensation wall 11, which is mounted in the cover 19 so as to be liquid-tight and displaceable in the vertical direction.
  • a seal 20 is used for sealing provided, for example an O-ring seal, which is arranged in an annular circumferential groove which is open in the radial direction to the outside of a ring projection 21 of the compensation wall 11 which points vertically upward.
  • the ring projection 21 also serves to guide the compensation wall in the vertical direction. In the operating position shown, it touches the stop 12 of the cover with its upwardly projecting end.
  • the compensation wall 11 is provided in the middle area with a one-piece, vertically downwardly projecting hollow cylinder 22, which is axially displaceable and liquid-tight on the hollow piston 23 of the liquid pump 2.
  • the hollow cylinder 22 is supported by a compression spring 24 on the lower part of the hollow piston 23.
  • the interior of the upper part 17 is connected to the interior of the reserve container 16 through an opening 34 and this interior is connected to the atmosphere through a further opening 33.
  • check valves or other suitable ventilation devices can be provided in the openings 33, 34. However, these must be designed in the area of the opening 34 so that leakage liquid passing through the compensation wall 11 can easily get back into the reserve container 16.
  • the cover 19 is provided with a radially inwardly facing annular projection 26 which is provided with a cylindrical opening in the center. This serves to guide the hollow cylinder 22 of the compensation wall 11.
  • the annular projection 26 is additionally provided with a stop 13 to limit the relative mobility of the compensation wall 11 downwards and with a support surface on which the spring 10, which supports the compensation wall 11 in the vertical direction, is made of metallic material is stored.
  • the spring 10 is designed as a helical spring. It is biased by the design and assignment of the stops 12, 13 to the compensation wall 11 such that there is no significant change in the spring force of the spring 10 with any relative displacement of the compensation wall 11 between the stops 12, 13.
  • the nozzle valve 8 is provided with an actuator 14 arranged in the interior of the spring accumulator 9, which is supported by a further compression spring 27 on the actuator of the outlet valve of the liquid pump 2.
  • the further compression spring 27 is dimensioned and designed such that, regardless of the relative assignment of the compensation wall 11 to the stops 12, 13, good operational reliability of the outlet valve 5 of the liquid pump 2 and of the nozzle valve 8 is always ensured.
  • the reference numbers 29 denote through-openings through which leakage liquid that may occur gets back into the reserve container 16.
  • the reserve container 16 can in turn be connected to the atmosphere through a ventilation opening 33.
  • This can also be conveniently replaced by an opening in the Side wall of upper part 17.
  • a check valve is expediently provided in the ventilation opening 33. This prevents liquid from escaping to the outside. this prevents it.
  • the ratio of the hydraulically effective cross sections of the compensation wall 11 and the liquid pump 2 is approximately 20. A small amount of power is required to fill the spring accumulator 9 if the cross section of the liquid pump is even smaller than indicated in the drawing for the sake of clarity. The stroke of the pump can also be chosen longer.
  • FIG. 2 shows an embodiment which differs from the one described above by a relatively simplified structure and which can thereby be produced more cost-effectively.
  • the spring accumulator 9 is preloaded with a plate spring 15, which consists of a glass fiber reinforced plastic and is produced in one piece with the hollow cylinder 22 of the liquid pump 2.
  • the plate spring is snapped into a groove in the cover in the region of its outer circumference and is statically sealed by an O-ring being inserted in relation to the cover 19.
  • the occurrence of leakage losses in the area in question is hereby excluded, and the spray gun can easily be used in an overhead position.
  • the plate spring 15 is provided in the central region with integrally formed, evenly distributed in the circumferential direction and projecting in the vertical direction pin 35, which prevent a further relative displacement of the plate spring 15 when touching the upper stop 12.
  • the stop 13 is formed by projections of a disk 30 which is tied into an undercut in the cover 19.
  • the embodiment shown in Figure 3 differs from that described above in that the liquid pump 2 is formed by a peristaltic pump.
  • the lever 32 is always in the position shown due to the elasticity of the hose 31 in the non-actuated state.
  • the cross-section of the hose 31 is reduced, which results in a shift of liquid components from the interior of the hose 31 into the spring accumulator 9.
  • the actuators of the nozzle valve 8 and the exhaust valve 5 are arranged opposite one another, which makes it possible to use the actuator 14 of the nozzle valve 8 as an upper stop 12 for the relative mobility of the plate spring 15.
  • the plate spring 15 is provided with projections 35 projecting vertically upwards and uniformly distributed in the circumferential direction, which can be placed against the underside of the actuator 14 in the uppermost position of the plate spring 15. In the completely emptied state of the spring accumulator 9, actuation of the nozzle valve is hereby excluded, which signals to the user that the liquid pump has to be refilled.
  • FIG. 4 shows a force-displacement diagram of a spring which is particularly suitable for the elastic prestressing of the spring accumulator of the spray gun proposed.
  • the spring characteristic has an S-shaped course with a particularly large deformation range in which there is no significant change in the spring force.
  • the pressure in the spring accumulator is largely constant regardless of the state of filling, which ensures the achievement of a balanced spray pattern in the entire working area. Exploitation of this effect succeeds in that the mobility of the compensation wall is limited by the targeted attachment of stops to the horizontal area of the spring characteristic of the associated spring.
  • the springs used are able to absorb a large preload. From this point of view, the use of disc springs is preferred.

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  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP19910101173 1990-02-02 1991-01-30 Spray gun for liquids Withdrawn EP0440179A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4003039 1990-02-02
DE19904003039 DE4003039A1 (de) 1990-02-02 1990-02-02 Spruehpistole fuer fluessigkeiten

Publications (2)

Publication Number Publication Date
EP0440179A2 true EP0440179A2 (fr) 1991-08-07
EP0440179A3 EP0440179A3 (en) 1991-12-04

Family

ID=6399253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910101173 Withdrawn EP0440179A3 (en) 1990-02-02 1991-01-30 Spray gun for liquids

Country Status (2)

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EP (1) EP0440179A3 (fr)
DE (1) DE4003039A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29514080U1 (de) * 1995-09-01 1995-10-12 Gloria-Werke H. Schulte-Frankenfeld Gmbh & Co, 59329 Wadersloh Behälter zum Sammeln von Abfallstoffen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT57559B (de) * 1912-01-29 1913-02-10 Hermann Strumpf Zerstäuber.
DE1804838A1 (de) * 1968-10-24 1970-06-11 Schlossar Edmund Fluessigkeitszerstaeuber mit handbetaetigter Druckerzeugungseinrichtung
JPS5425245B1 (fr) * 1971-05-08 1979-08-27
GB1485767A (en) * 1973-12-06 1977-09-14 Unilever Ltd Pump dispenser
US4167941A (en) * 1976-10-05 1979-09-18 James D. Pauls, Ltd. (Limited Partnership) Mechanically operated dispensing device for increasing discharge pressure and dispensing time
FR2380076A1 (fr) * 1977-02-15 1978-09-08 Normos Norbert Dispositif de dosage et pulverisation des liquides comportant un soufflet
US4174055A (en) * 1977-04-20 1979-11-13 James D. Pauls & J. Claybrook Lewis & Associates, Ltd. Non-aerosol pressure dispenser
DE3208954A1 (de) * 1982-03-12 1983-09-22 Bayer Ag, 5090 Leverkusen Dosierpistole
DE3633173A1 (de) * 1986-09-30 1988-04-07 Mega Prod Verpack Marketing Foerdereinrichtung

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Publication number Publication date
DE4003039A1 (de) 1991-08-08
EP0440179A3 (en) 1991-12-04

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