Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
  • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
  • B05B1/323—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening the valve member being actuated by the pressure of the fluid to be sprayed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L59/00—Thermal insulation in general
  • F16L59/04—Arrangements using dry fillers, e.g. using slag wool which is added to the object to be insulated by pouring, spreading, spraying or the like

Definitions

• the present invention relates to a nozzle unit for use at a pre ⁇ cise dosage of liquid in small quantities
• a nozzle body which has a substantially conical nozzle duct in the region near by the nozzle orifice and which at least in the region in the immediate vicinity of the nozzle orifice is made of elastic material, preferably acid-proof rubber.
• a nozzle unit of the type referred to in the introductory paragraph cha ⁇ racterized in that a part of the nozzle body length arranged remotest from the nozzle orifice is provided with a reinforcement, which extends to a region in the immediate vicinity of the nozzle orifice, so that only the elastic material in the immediate vicinity of the nozzle ori ⁇ fice is able to expand as a result of high pressure in the nozzle, whereby a variable nozzle orifice is imparted to the nozzle.
• a nozzle unit is hereby obtained which in a structural simple way is imparted a variable nozzle orifice, which may be adapted to fluids of different viscosities and different rates of flow by a convenient choise of elastic material and wall thichness, which choice will be possible to a skilled in the art.
• the reinforcement ensures that a so-called balloon effect will not occur, which otherwise, might cause an inaccurate dosage or a rupture of the elastic material.
• the nozzle unit is characterized in that the nozzle body throughout is made of elastic material and that the reinforcement comprises an increase of the mate ⁇ rial thickness in the wall of the nozzle body.
• the reinforcement comprises an increase of the mate ⁇ rial thickness in the wall of the nozzle body.
• the nozzle unit is characterized in that the reinforcement comprises a substantialle non-elastic tube with a length shorter than the length of the nozzle body and that the tube is arranged surrounding the nozzle body or embedded therein.
• the reinforcement comprises a substantialle non-elastic tube with a length shorter than the length of the nozzle body and that the tube is arranged surrounding the nozzle body or embedded therein.
• the surrounding tube has a length of about 80 - 95% of the length of the nozzle body as it hereby becomes possible to prevent the balloon effect to occur at any position along substantially the whole extension of the conical part rather than at the transition between the conical part and the cylindrical part.
• the nozzle body has a length of 50 mm and an inner diameter of about 5 mm at the collar, and the surrounding tube has a length of about 40 - 45 mm.
• the surrounding tube may not have a length corresponding to or greater than the length of the nozzle body, since hereby a risk arises for adhering drops which might fall off and reduce the accuracy of dosage.
• Fig. 1 shows a section through a nozzle unit according to the present invention
• Fig. 2 shows a section through the nozzle unit of Fig. 1 and a surrounding tube, and Fig. 3-6 sections, in a reduced scale through further embodiments of a nozzle unit according to the present invention.
• a nozzle unit 1 is shown, comprising a collar 2 for securing and fixing of nozzle body as regards a holder (not shown).
• the nozzle body 1 comprises a cylindrical part 3 and a substantially conical part 4 with a conical nozzle duct 5.
• the conical nozzle duct 5 extends from the nozzle orifice 6 over the greater part of the whole length of the nozzle body 1.
• the nozzle body 1 has substantially con ⁇ stant wall thickness over the whole length and is made of acid-proof rubber, to resist aggressive constituents, such as solvents in the discharged fluid.
• the elasticity of the rubber will depend on the in ⁇ tended use, and it can be chosen with due regard to the properties requested for the nozzle.
• a corresponding nozzle body 1 is shown, which is provi- ded with a reinforcement in the form of a tube 7.
• the tube 7 extends from the collar 2 beyond the transition 8 between the cylindrical part 3 and the conical part 4. Accordingly, at the transition 8 where the section is decreased and where the largest stresses on the wall of the nozzle body occur, the tube 7 will insure that no balloon effect arises in the nozzle body 1 since the expansion thereof is limited of the non-elastic tube 7.
• FIGs. 3-6 show further embodiments of the nozzle body intended to be made of the same material as is the nozzle body shown on Figs. 1 and 2.
• Fig. 3 shows a nozzle body 1, wherein the cylindrical part 3 is of a length considerably larger than the length of the substantially conical part.
• This nozzle body may be sourrounded by a tube (not shown) corresponding to the tube 7 of Fig. 2.
• Fig. 4 shows a nozzle body 1, wherein the substantialle conical part is extending wholly along the length of the nozzle body 1.
• This nozzle body too, may be surrounded by a tube corresponding to the tube 7 of Fig. 2.
• Figs. 5 and 6 show two nozzle bodies, each of which integrally is provided with a reinforcement.
• the nozzle body 1 is provided with a reinforcement in the form of a tube 10 embedded in the very wall 9 of the nozzle 1, in the cylindrical part 3 thereof.
• the tube illustrated extends wholly along the length of the conical part 3.
• the nozzle body is provided with a reinforcement in the form of an increase of the wall thickness, extending along a part of the length of the nozzle body. This increased wall thickness will in the embodi ⁇ ment shown substantially extends along the whole length of the cylin ⁇ drical part.
• nozzle bodies with cylindrical and conical configuration have been explained and illustrated in the above, it is obvious that the nozzle body may be made with a curvature, starting at the nozzle orifice 6 and extending wholly or partly along the length of the nozz ⁇ le body 1.
• a nozzle unit An example of the accuracy obtainable with a nozzle unit according to the present invention may be given.
• an accuracy of dosage of 0,05 ml, depending on the drop size at the nozzle orifice has been achieved. This has been achieved in a nozzle unit, which has a rate of throughput of 10 ml/sec at a pressure of 2,8 bar as measured in the nozzle body orifice.
• the nozzle unit employed had a length of about 50 mm, an inner diameter of about 5 mm at the collar 2 and a diameter of about 0,5 mm at the nozzle orifice 6 and the fluid employed had a viscosity substantially corresponding to the viscosity of water.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Nozzles (AREA)
• Coating Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8101281

Family Applications (1)

Country Status (3)

Cited By (6)

Citations (6)

• 1986
  • 1986-03-11 DK DK112486A patent/DK112486A/da not_active Application Discontinuation
• 1987
  • 1987-03-09 EP EP87902069A patent/EP0264389A1/de not_active Withdrawn
  • 1987-03-09 WO PCT/DK1987/000025 patent/WO1987005537A1/en unknown

Patent Citations (6)

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