CA2108543C - Blasting gun for compressed air - Google Patents
Blasting gun for compressed airInfo
- Publication number
- CA2108543C CA2108543C CA002108543A CA2108543A CA2108543C CA 2108543 C CA2108543 C CA 2108543C CA 002108543 A CA002108543 A CA 002108543A CA 2108543 A CA2108543 A CA 2108543A CA 2108543 C CA2108543 C CA 2108543C
- Authority
- CA
- Canada
- Prior art keywords
- valve
- air
- blasting gun
- valve body
- gun according
- 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.)
- Expired - Lifetime
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
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
- B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
- B05B1/083—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators the pulsating mechanism comprising movable parts
-
- 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
- B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
Landscapes
- Nozzles (AREA)
- Cleaning In General (AREA)
- Valve Device For Special Equipments (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
The blasting gun for compressed air, in which a dynamic effect of the air is utilized for removing dirt and for cleaning purposes, comprises a built-in oscillator seat valve for producing a pulsating air stream with periodically repeated pressure discharges at a frequency of the order of 2-50 Hz thus causing the valve alternately to open and close an air flow through the blasting gun, this oscillator seat valve comprising a longitudinally displaceable oblong valve body having an end for shutting off the air flow through an air outlet of the gun by resting in contact against a valve seat under the influence of a compression spring, the oblong valve body having another end embodied as a piston displaceable through a closed cylinder. The piston separates an inner volume of the cylinder into two complementary back and front portions, the back portion of the volume being connected to the air outlet which is located on an outer side of the valve seat via a longitudinal bore through the valve body, the front portion of the volume being connected to a pressurized air chamber located on an inner side of the valve seat via a duct.
Description
The present invention relates to a Jblasting gun for compressed air.
The application of compressed air i'or removal of dirt and for cleaning purposes is a well-known and extensively used technique. In order to produce a concentrated and controllable air jet the usual design is a pistol-like tool with an oblong air nozzle and a built-in shut-off valve.
The shut-off valve is manually operated via a pawl or similar trigger mechanism mounted in conneci~ion with the handle of the blasting gun. When the trigger mechanism is activated a concentrated air jet is let out through the nozzle, and by pointing this air jet on to the object to be cleaned it is possible to loosen or blast off dirt and impurities, such as dust, earth, oily coats, etc. The ability of the air jet to loosen old dirt and sticking coats of various kinds depends on the dynamic pressure exerted by the jet, i.e. primarily the jet velocity. The greater the velocity the better the cleaning ef f ect .
However, the jet velocity is limited to the available air pressure, usually 6 bar, and consequently an increase in the cleaning effect can only be achieved by increasing the air flow. Especially for the purpose of: removal of thick sticking coats will the air consumption easily be disproportionately large, and the cleaning method therefore uneconomical.
The basis of the present invention ins the desire to improve the loosening and cleaning effect of tree blasting gun in relation to particularly firmly sticking impurities and at the same time achieve economy in the consumption of compressed air.
The application of compressed air i'or removal of dirt and for cleaning purposes is a well-known and extensively used technique. In order to produce a concentrated and controllable air jet the usual design is a pistol-like tool with an oblong air nozzle and a built-in shut-off valve.
The shut-off valve is manually operated via a pawl or similar trigger mechanism mounted in conneci~ion with the handle of the blasting gun. When the trigger mechanism is activated a concentrated air jet is let out through the nozzle, and by pointing this air jet on to the object to be cleaned it is possible to loosen or blast off dirt and impurities, such as dust, earth, oily coats, etc. The ability of the air jet to loosen old dirt and sticking coats of various kinds depends on the dynamic pressure exerted by the jet, i.e. primarily the jet velocity. The greater the velocity the better the cleaning ef f ect .
However, the jet velocity is limited to the available air pressure, usually 6 bar, and consequently an increase in the cleaning effect can only be achieved by increasing the air flow. Especially for the purpose of: removal of thick sticking coats will the air consumption easily be disproportionately large, and the cleaning method therefore uneconomical.
The basis of the present invention ins the desire to improve the loosening and cleaning effect of tree blasting gun in relation to particularly firmly sticking impurities and at the same time achieve economy in the consumption of compressed air.
According to the present invention, there is provided a blasting gun for compressed air, in which a dynamic effect of the air is utilized for removing dirt and for cleaning purposes, the blasting gun compr_Lsing an oscillator seat valve that, in operation, opens and closes to produce a pulsating air stream comprising periodically repeated pressurized air discharges at a frequency of the order of 2-50 Hz, the oscillator seam valve comprising a longitudinally displaceable oblong valve body having one end forming a cone-shaped tightening disk for shutting off the air flow through an air outlet of the gun by resting in contact against a valve seat under the influence of a compression spring, the oblong valve body having the other end embodied as a piston displaceable through a chamber of a closed cylinder, the piston separating the chamber of the cylinder into first and second portions which are respectively downstream and upstream of the piston, the second portion of the chamber being connected to the air outlet via a longitudinal bore through the valve body, the first portion of the chamber being connected to a pressurized air chamber via a duct upstream of the valve seat.
The oscillating shut-off valve in the blasting gun has the effect that the compressed air - instead of being ejected as a continuous air jet through the nozzle - is here split up into a series of short pressure gusts, more specifically as a pulsating air stream with periodically repeated pressure discharges. These periodical discharges - by way of example with frequencies of 10-20 Hz -~ involve a time-related concentration of the pressure energy of the air so that the peak value of the dynamic pressure o:E the air in the individual C
2a discharge is increased as compared with the dynamic pressure that would be achieved, if the same volume of air was ejected continuously through the nozzle. As already stated, the dynamic pressure in the air jet determines the ability of the air to loosen striking impurities and coats.
._.,a __ 210854 3 In addition to the greater dynamic pressure, the pulsating air jet also has the surprising effect of almost setting the impurities in vibrating motion under the influence of the air pulses. In the case of certain types of impurities and coats, practice has shown that this Effect to a high, degree contributes to increasing the cleaning effect of the blasting gun, as the vibrations cooperate in loosening the substances so that the cleaning operation is much faster, more thorough and more economical with the consumption of compressed air. The blasting gun according to the invention is therefore supposed to a certain extent to be able to replace traditional high-pressure cleaning (water-based jet cleaning) with the advantages this entails, both with regard to economy and environmental protection.
The mode of operation of the oscillating shut-off valve is as follows: in the normal starting position the valve body is held against the valve seat in its closing/sealing position by the coil spring. When compressed air is admitted (by activation of the trigger mechanism of the gun) the pressure is increased on one side of the piston. The pressure exceeds the spring power and the valve opens, which results in a momentary discharge of compressed air and a fall in the pressure. The valve therefore closes again and the cycle is repeated. oscillation continues as long as compressed air is admitted to the valve", i . a . as long as the trigger mechanism is kept: activated. The valve thus gives an automatic alternating opening and closing - under the influence of the static and dynamic pressures of the compressed air - of the passage of air in the blasting gun.
The oscillation action of the valve body presupposes a suitable balanced condition between the valve dimension, the mass of the valve body (= the moving mass) and 'the characteristics of the spring. It is also essential that the valve body can move freely, i.e. with low friction. The frequency depends on these factors in combination with the pressure of the compressed air.
-, Preferably, the piston is furnished with a low-friction sealing ring made of a material with good sliding properties, the sealing ring being designed and embodied to give a tight seal against wall of the cylinder with the lowest possible radial pressure. Preferably the sealing ring is composed of a relatively thin teflon ring supported on one side by an O-ring, both rings being embedded in a ring-shaped groove in the piston. In this design the sealing arrangement satisfies the demand fvr low friction and ease of valve movement. An to expedient measure would be to supply the valve seat or the valve body itself with a rubber-ela~>tic coating with a view to noise level and long life of the valve. Preferably, the end of the valve body that is for resting in contact against the valve seat consists of a rubber-elastic material with good fatigue strength.
The blasting gun according to the invention can, like any ordinary compressed air blasting gun, be combined with an ejector for the supply of liquid o:r grainy material together 20 with the air. Preferably, the blasting gun comprises a pistol portion and a nozzle portion, the pistol portion including a grip supplied with a trigger mechanism for the compressed air, the nozzle portion being exchangeable as one unit. The oscillator seat valve is incorporated in the pistol portion, the nozzle portion having an end connectable to an ejector part for the supply of an admixture to the pulsating air stream to achieve an additional effect. The combination of pulsating compressed air and an additive consisting of an agent for cleaning or for solution gives a powerful increase in the 30 cleaning effect. This procedure is used in special cases where such increase in efficiency is demanded.
The invention will be explained furtlher in connection with the drawing in which:
Fig. 1 is a side view of a compressed air blasting gun according to the invention, Fig. 2 is an enlarged sectional view of a jet nozzle of this blasting gun, Fig. 3 is a separate, enlarged longitudinal section of the oscillatory shut-off valve of the blasting gun, Fig. 4 shows an ejector nozzle intE~nded for use with addition l0 of a liquid simultaneously with the compressed air, Fig. 5 is a similar ejector nozzle .intended for sand blasting, and Fig. 6, is a combined ejector/mixer valve with connections for air and two different liquids simultaneously.
In the embodiment shown in the drawing fig. 1 the blasting gun consists essentially of a handle section 1 (pistol grip) with 20 a trigger lever 2 and trigger guard 3, an extension barrel 4, and an exchangeable nozzle pipe 5. The nozzle pipe has an exchangeable nozzle bit 6. The latter is shown separately in Fig. 2. The handle section 1 contains a not shown shut-off valve, which opens by means of a~ trigger lever 2, and an oscillatory pressure discharge valve. The pressure 'discharge valve is built into the portion of the handle section marked la. The air connection to the blasting gun takes place via a hose coupling 7. The nozzle pipe !i is mounted on the handle section 1 by means of a knurled pipe union nut 8.
Fig. 3 is a separate sectional view of the oscillatory pressure discharge valve. The main component: of the pressure discharge valve is a seat valve, whose seat is designated 9, and the valve body 10. The valve body is embodied in the shape of an oblong, rotationally symmetric body with a longitudinal bore.
One end of the valve body forms a cone-shaped tightening disk .~, 210854 3 11 with a tight fit against the seat. 9. A rubber coating lla is vulcanized on to the cone-shaped part 11. The opposite end of the valve body 10 constitutes a piston 12 embedded in a cylinder 13. Between the piston 12 .and the cone-shaped part 11 the valve body consists of an oblong cylindrical shaft portion 14.
The longitudinal bore in the valve body - in the drawing designated 15 - serves to connect t'.he hindmost part of portion l0 13a of the cylinder 13 to the air dvuct 16 after the seat valve 11, i.e. to the extension barrel 4 and the nozzle pipe 5. The valve body is held home in its seat by a compression spring coil 17 inserted in the cylinder 13~ behind the piston 12.
The other side 13b of the cylinder is connected via an eccentrically positioned, longitudinal bore 18 to an air chamber 19, which is located immed_Lately in front of the seat valve on the pressure side of the latter. The direction of flow through the valve is shown with arrows 20.
The piston part 12 of the valve body is fitted with a low-friction tightening ring composed of a teflon disk 21 and an o-ring 22. The O-ring serves as a supporting disk for the teflon ring, which through its contact against the cylinder wall ensures the tightness of the piston. ' Valve dimension, size and weight of the valve body, spring characteristics, the flow ducts' cross-sectional area, etc. are mutually adjusted so that the desired oscillatory effect is created by itself immediately on the opening of the air flow (by activation of the trigger lever 2). The oscillatory effect is explained above and will not bE~ repeated here. During the oscillatory motion of the valve body the passage of the compressed air through the seat valve is opened and closed, and this gives rise to the desired pulse air with cyclically repeated pressure discharges. The pressure impacts from the pressure discharges are transmitted from the seat valve 9,11 and continues through the extension barrel 4, the nozzle pipe and the nozzle head 6.
By exchanging the nozzle pipe 5 the blasting gun can be fitted with ejectors of various kinds, cf. Figs. 4, 5 and 6. Fig. 4 shows a combined ejector and mixer valve for liquid. The liquid is supplied via a hose 23. The nozzle pipe of the blasting gun is designated 24. A shut-off valve incorporated in the mixer valve (the ejector) shuts off the liquid supply under the influence of the pressure of they liquid and opens again automatically when the supply of compressed air is opened.
The mixer valve can alternatively serve as an ejector, i.e.
with pressureless supply of liquid. The liquid will then be sucked to the ejector from a not shown tank or container by normal ejector effect, when compressed air is sent through the ejector.
Both as a mixer valve and as an ejector the quantity of liquid is adjustable by means of a flow valve positioned at the intake opening of the ejector nozzle. The flow valve is operated via a finger union nut 23a.
Fig. 5 shows an ejector for use in ;sand blasting: The sand is sucked to the nozzle by the ejector effect via a tubular lance 25. By regulation of the suction ai:r through the suction hose (the so-called false air) the flow of sand can be adjusted to actual needs. Regulation is done by means of an air flow valve (volume regulation valve) 25a built into the upper end of the sand lance.
Fig. 6 shows an injector/mixer valve 26, which in addition to an air admission pipe 27 has two extra openings 28 an 29 for admixture of water and liquid chemicals, respectively. The design makes it possible to mix air + water + chemical in one r~
s and the same jet. This combination is useful, among other things in connection with jobs requiring disinfection or cleaning for grease.
The mixer valve can be used in the following combinations:
1) air only (both liquid intakes are plugged or otherwise closed), 2) air + adjustable volume of water, 3) air + adjustable volume of water + adjustable volume of l0 chemicals, 4) air + adjustable volume of chemicals, 5) air + water-soluble chemical + adjustable (cone ) chemical 5) air-drying after cleaning with water/chemicals.
The invention is not limited to they above shown and explained embodiment. other types of oscillatory pressure discharge valves are also possible. The primary idea of the invention is the conversion of the static energy of the compressed air into a pulsating, concentrated air jet with high dynamic energy 2o content in the individual pressure discharges.
The oscillating shut-off valve in the blasting gun has the effect that the compressed air - instead of being ejected as a continuous air jet through the nozzle - is here split up into a series of short pressure gusts, more specifically as a pulsating air stream with periodically repeated pressure discharges. These periodical discharges - by way of example with frequencies of 10-20 Hz -~ involve a time-related concentration of the pressure energy of the air so that the peak value of the dynamic pressure o:E the air in the individual C
2a discharge is increased as compared with the dynamic pressure that would be achieved, if the same volume of air was ejected continuously through the nozzle. As already stated, the dynamic pressure in the air jet determines the ability of the air to loosen striking impurities and coats.
._.,a __ 210854 3 In addition to the greater dynamic pressure, the pulsating air jet also has the surprising effect of almost setting the impurities in vibrating motion under the influence of the air pulses. In the case of certain types of impurities and coats, practice has shown that this Effect to a high, degree contributes to increasing the cleaning effect of the blasting gun, as the vibrations cooperate in loosening the substances so that the cleaning operation is much faster, more thorough and more economical with the consumption of compressed air. The blasting gun according to the invention is therefore supposed to a certain extent to be able to replace traditional high-pressure cleaning (water-based jet cleaning) with the advantages this entails, both with regard to economy and environmental protection.
The mode of operation of the oscillating shut-off valve is as follows: in the normal starting position the valve body is held against the valve seat in its closing/sealing position by the coil spring. When compressed air is admitted (by activation of the trigger mechanism of the gun) the pressure is increased on one side of the piston. The pressure exceeds the spring power and the valve opens, which results in a momentary discharge of compressed air and a fall in the pressure. The valve therefore closes again and the cycle is repeated. oscillation continues as long as compressed air is admitted to the valve", i . a . as long as the trigger mechanism is kept: activated. The valve thus gives an automatic alternating opening and closing - under the influence of the static and dynamic pressures of the compressed air - of the passage of air in the blasting gun.
The oscillation action of the valve body presupposes a suitable balanced condition between the valve dimension, the mass of the valve body (= the moving mass) and 'the characteristics of the spring. It is also essential that the valve body can move freely, i.e. with low friction. The frequency depends on these factors in combination with the pressure of the compressed air.
-, Preferably, the piston is furnished with a low-friction sealing ring made of a material with good sliding properties, the sealing ring being designed and embodied to give a tight seal against wall of the cylinder with the lowest possible radial pressure. Preferably the sealing ring is composed of a relatively thin teflon ring supported on one side by an O-ring, both rings being embedded in a ring-shaped groove in the piston. In this design the sealing arrangement satisfies the demand fvr low friction and ease of valve movement. An to expedient measure would be to supply the valve seat or the valve body itself with a rubber-ela~>tic coating with a view to noise level and long life of the valve. Preferably, the end of the valve body that is for resting in contact against the valve seat consists of a rubber-elastic material with good fatigue strength.
The blasting gun according to the invention can, like any ordinary compressed air blasting gun, be combined with an ejector for the supply of liquid o:r grainy material together 20 with the air. Preferably, the blasting gun comprises a pistol portion and a nozzle portion, the pistol portion including a grip supplied with a trigger mechanism for the compressed air, the nozzle portion being exchangeable as one unit. The oscillator seat valve is incorporated in the pistol portion, the nozzle portion having an end connectable to an ejector part for the supply of an admixture to the pulsating air stream to achieve an additional effect. The combination of pulsating compressed air and an additive consisting of an agent for cleaning or for solution gives a powerful increase in the 30 cleaning effect. This procedure is used in special cases where such increase in efficiency is demanded.
The invention will be explained furtlher in connection with the drawing in which:
Fig. 1 is a side view of a compressed air blasting gun according to the invention, Fig. 2 is an enlarged sectional view of a jet nozzle of this blasting gun, Fig. 3 is a separate, enlarged longitudinal section of the oscillatory shut-off valve of the blasting gun, Fig. 4 shows an ejector nozzle intE~nded for use with addition l0 of a liquid simultaneously with the compressed air, Fig. 5 is a similar ejector nozzle .intended for sand blasting, and Fig. 6, is a combined ejector/mixer valve with connections for air and two different liquids simultaneously.
In the embodiment shown in the drawing fig. 1 the blasting gun consists essentially of a handle section 1 (pistol grip) with 20 a trigger lever 2 and trigger guard 3, an extension barrel 4, and an exchangeable nozzle pipe 5. The nozzle pipe has an exchangeable nozzle bit 6. The latter is shown separately in Fig. 2. The handle section 1 contains a not shown shut-off valve, which opens by means of a~ trigger lever 2, and an oscillatory pressure discharge valve. The pressure 'discharge valve is built into the portion of the handle section marked la. The air connection to the blasting gun takes place via a hose coupling 7. The nozzle pipe !i is mounted on the handle section 1 by means of a knurled pipe union nut 8.
Fig. 3 is a separate sectional view of the oscillatory pressure discharge valve. The main component: of the pressure discharge valve is a seat valve, whose seat is designated 9, and the valve body 10. The valve body is embodied in the shape of an oblong, rotationally symmetric body with a longitudinal bore.
One end of the valve body forms a cone-shaped tightening disk .~, 210854 3 11 with a tight fit against the seat. 9. A rubber coating lla is vulcanized on to the cone-shaped part 11. The opposite end of the valve body 10 constitutes a piston 12 embedded in a cylinder 13. Between the piston 12 .and the cone-shaped part 11 the valve body consists of an oblong cylindrical shaft portion 14.
The longitudinal bore in the valve body - in the drawing designated 15 - serves to connect t'.he hindmost part of portion l0 13a of the cylinder 13 to the air dvuct 16 after the seat valve 11, i.e. to the extension barrel 4 and the nozzle pipe 5. The valve body is held home in its seat by a compression spring coil 17 inserted in the cylinder 13~ behind the piston 12.
The other side 13b of the cylinder is connected via an eccentrically positioned, longitudinal bore 18 to an air chamber 19, which is located immed_Lately in front of the seat valve on the pressure side of the latter. The direction of flow through the valve is shown with arrows 20.
The piston part 12 of the valve body is fitted with a low-friction tightening ring composed of a teflon disk 21 and an o-ring 22. The O-ring serves as a supporting disk for the teflon ring, which through its contact against the cylinder wall ensures the tightness of the piston. ' Valve dimension, size and weight of the valve body, spring characteristics, the flow ducts' cross-sectional area, etc. are mutually adjusted so that the desired oscillatory effect is created by itself immediately on the opening of the air flow (by activation of the trigger lever 2). The oscillatory effect is explained above and will not bE~ repeated here. During the oscillatory motion of the valve body the passage of the compressed air through the seat valve is opened and closed, and this gives rise to the desired pulse air with cyclically repeated pressure discharges. The pressure impacts from the pressure discharges are transmitted from the seat valve 9,11 and continues through the extension barrel 4, the nozzle pipe and the nozzle head 6.
By exchanging the nozzle pipe 5 the blasting gun can be fitted with ejectors of various kinds, cf. Figs. 4, 5 and 6. Fig. 4 shows a combined ejector and mixer valve for liquid. The liquid is supplied via a hose 23. The nozzle pipe of the blasting gun is designated 24. A shut-off valve incorporated in the mixer valve (the ejector) shuts off the liquid supply under the influence of the pressure of they liquid and opens again automatically when the supply of compressed air is opened.
The mixer valve can alternatively serve as an ejector, i.e.
with pressureless supply of liquid. The liquid will then be sucked to the ejector from a not shown tank or container by normal ejector effect, when compressed air is sent through the ejector.
Both as a mixer valve and as an ejector the quantity of liquid is adjustable by means of a flow valve positioned at the intake opening of the ejector nozzle. The flow valve is operated via a finger union nut 23a.
Fig. 5 shows an ejector for use in ;sand blasting: The sand is sucked to the nozzle by the ejector effect via a tubular lance 25. By regulation of the suction ai:r through the suction hose (the so-called false air) the flow of sand can be adjusted to actual needs. Regulation is done by means of an air flow valve (volume regulation valve) 25a built into the upper end of the sand lance.
Fig. 6 shows an injector/mixer valve 26, which in addition to an air admission pipe 27 has two extra openings 28 an 29 for admixture of water and liquid chemicals, respectively. The design makes it possible to mix air + water + chemical in one r~
s and the same jet. This combination is useful, among other things in connection with jobs requiring disinfection or cleaning for grease.
The mixer valve can be used in the following combinations:
1) air only (both liquid intakes are plugged or otherwise closed), 2) air + adjustable volume of water, 3) air + adjustable volume of water + adjustable volume of l0 chemicals, 4) air + adjustable volume of chemicals, 5) air + water-soluble chemical + adjustable (cone ) chemical 5) air-drying after cleaning with water/chemicals.
The invention is not limited to they above shown and explained embodiment. other types of oscillatory pressure discharge valves are also possible. The primary idea of the invention is the conversion of the static energy of the compressed air into a pulsating, concentrated air jet with high dynamic energy 2o content in the individual pressure discharges.
Claims (10)
1. Blasting gun for compressed air, in which a dynamic effect of the air is utilized for removing dirt and for cleaning purposes, the blasting gun comprising an oscillator seat valve that, in operation, opens and closes to produce a pulsating air stream comprising periodically repeated pressurized air discharges at a frequency of the order of 2-50 Hz, the oscillator seat valve comprising a longitudinally displaceable oblong valve body having one end forming a cone-shaped tightening disk for shutting off the air flow through an air outlet of the gun by resting in contact against a valve seat under the influence of a compression spring, the oblong valve body having the other end embodied as a piston displaceable through a chamber of a closed cylinder, the piston separating the chamber of the cylinder into first and second portions which are respectively downstream and upstream of the piston, the second portion of the chamber being connected to the air outlet via a longitudinal bore through the valve body, the first portion of the chamber being connected to a pressurized air chamber via a duct upstream of the valve seat.
2. Blasting gun according to claim 1, wherein the piston is furnished with a low-friction sealing ring, the sealing ring being designed and embodied to give a tight seal against the wall of the cylinder with the lowest possible radial pressure.
3. Blasting gun according to claim 2, wherein the sealing ring is composed of a relatively thin teflon ring supported on one side by an O-ring, both rings being embedded in a ring-shaped groove in the piston.
4. Blasting gun according to claim 1, wherein said one end of the valve body for shutting off the air flow consists of a rubber-elastic material.
5. Blasting gun according to claim 1, comprising a pistol portion and a nozzle portion, the pistol portion including a grip supplied with a trigger mechanism for activating an introduction of pressurized air into the pressurized air chamber, the nozzle portion being exchangeable as one unit, the oscillator seat valve being incorporated in the pistol portion, the nozzle, portion having an output connectable to an input of an ejector for combining the pulsating air stream with a material and ejecting an admixture thereof.
6. Blasting gun according to claim 5, wherein the ejector is for combining the pulsating air stream with a liquid, and the ejector has a shut-off valve for the liquid, the said shut-off valve being designed for opening under the influence of compressed air in the ejector, when the gun is activated.
7. Blasting gun according to claim 2, wherein the low-friction sealing ring is made of teflon.
8. Blasting gun according to claim 1, wherein said one end of the valve body for shutting off the air flow is coated with a rubber-elastic material.
9. Blasting gun according to claim 4 or 8, wherein the rubber elastic material is selected from the group comprising polyurethane and synthetic rubber.
10. Blasting gun according to claim 5, wherein the material combined with the pulsating air stream is selected from the group comprising cleaning liquid, water and sand.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK0687/91 | 1991-04-17 | ||
| DK68791A DK170523B1 (en) | 1991-04-17 | 1991-04-17 | Compressed air blower |
| PCT/DK1992/000122 WO1992018260A1 (en) | 1991-04-17 | 1992-04-13 | Blast gun for compressed air |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2108543A1 CA2108543A1 (en) | 1992-10-18 |
| CA2108543C true CA2108543C (en) | 1999-11-23 |
Family
ID=8096393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002108543A Expired - Lifetime CA2108543C (en) | 1991-04-17 | 1992-04-13 | Blasting gun for compressed air |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0580711B1 (en) |
| JP (1) | JP2638302B2 (en) |
| AU (1) | AU655974B2 (en) |
| BR (1) | BR9205897A (en) |
| CA (1) | CA2108543C (en) |
| DE (1) | DE69206140T2 (en) |
| DK (1) | DK170523B1 (en) |
| ES (1) | ES2081107T3 (en) |
| HU (1) | HU217286B (en) |
| RU (1) | RU2107558C1 (en) |
| WO (1) | WO1992018260A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE503140C2 (en) * | 1992-05-07 | 1996-04-01 | Dart Engineering Ag | Device at media transmitting unit |
| US5966847A (en) * | 1996-03-14 | 1999-10-19 | Concept Engineering Group, Inc. | Pneumatic excavator |
| KR101053440B1 (en) * | 2008-11-24 | 2011-08-02 | 한전케이피에스 주식회사 | Cleaning gun |
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| CN103624038B (en) * | 2013-12-23 | 2016-06-29 | 中国石油大学(华东) | Flexible blast-jet type pipe cleaner for crude oil pipeline |
| CN104324822B (en) * | 2014-09-25 | 2017-03-15 | 北京北机机电工业有限责任公司 | A kind of injection apparatus |
| JP6730070B2 (en) * | 2016-04-21 | 2020-07-29 | ダイセン株式会社 | Air nozzle device, air duster, and air chipper |
| CN107088484B (en) * | 2017-06-28 | 2023-07-18 | 迈德乐喷雾系统广州有限公司 | Small-sized air atomizing nozzle |
| EP3702053A4 (en) * | 2017-10-24 | 2020-12-09 | NSK Ltd. | Nozzle structure, blowing device, and method for producing components, bearings, direct-acting devices, steering devices and vehicles |
| JP7083674B2 (en) * | 2018-03-22 | 2022-06-13 | 株式会社マキタ | Portable blower |
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| US4077569A (en) * | 1976-10-04 | 1978-03-07 | Teledyne Industries, Inc. | Fluid-flow pulsator |
| SU1122494A1 (en) * | 1983-05-10 | 1984-11-07 | Калининский Ордена Трудового Красного Знамени Политехнический Институт | Method of hydraulic abrasive machining of parts |
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| US4933017A (en) * | 1987-08-28 | 1990-06-12 | Lemaks Industries, Inc. | Apparatus and method for opening drains |
| DE3901933A1 (en) * | 1989-01-24 | 1990-08-02 | Suttner Gmbh & Co Kg | Injector arrangement, in particular for high-pressure water cleaning devices |
| DK166766B1 (en) * | 1990-03-20 | 1993-07-12 | K F Ind As | PORTABLE HIGH PRESSURE CLEANER |
-
1991
- 1991-04-17 DK DK68791A patent/DK170523B1/en not_active IP Right Cessation
-
1992
- 1992-04-13 BR BR9205897A patent/BR9205897A/en not_active IP Right Cessation
- 1992-04-13 ES ES92909449T patent/ES2081107T3/en not_active Expired - Lifetime
- 1992-04-13 WO PCT/DK1992/000122 patent/WO1992018260A1/en active IP Right Grant
- 1992-04-13 EP EP92909449A patent/EP0580711B1/en not_active Expired - Lifetime
- 1992-04-13 CA CA002108543A patent/CA2108543C/en not_active Expired - Lifetime
- 1992-04-13 JP JP50846792A patent/JP2638302B2/en not_active Expired - Lifetime
- 1992-04-13 RU RU93057725A patent/RU2107558C1/en active
- 1992-04-13 AU AU16566/92A patent/AU655974B2/en not_active Expired
- 1992-04-13 HU HU9302926A patent/HU217286B/en unknown
- 1992-04-13 DE DE69206140T patent/DE69206140T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DK170523B1 (en) | 1995-10-16 |
| JP2638302B2 (en) | 1997-08-06 |
| DK68791A (en) | 1992-10-18 |
| HU217286B (en) | 1999-12-28 |
| EP0580711A1 (en) | 1994-02-02 |
| HU9302926D0 (en) | 1994-01-28 |
| DK68791D0 (en) | 1991-04-17 |
| CA2108543A1 (en) | 1992-10-18 |
| DE69206140D1 (en) | 1995-12-21 |
| WO1992018260A1 (en) | 1992-10-29 |
| BR9205897A (en) | 1994-07-26 |
| HUT66814A (en) | 1995-01-30 |
| EP0580711B1 (en) | 1995-11-15 |
| AU655974B2 (en) | 1995-01-19 |
| ES2081107T3 (en) | 1996-02-16 |
| JPH06506868A (en) | 1994-08-04 |
| DE69206140T2 (en) | 1996-05-30 |
| AU1656692A (en) | 1992-11-17 |
| RU2107558C1 (en) | 1998-03-27 |
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