GB2423034A - Spray gun check-valve arrangement - Google Patents

Spray gun check-valve arrangement Download PDF

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Publication number
GB2423034A
GB2423034A GB0602651A GB0602651A GB2423034A GB 2423034 A GB2423034 A GB 2423034A GB 0602651 A GB0602651 A GB 0602651A GB 0602651 A GB0602651 A GB 0602651A GB 2423034 A GB2423034 A GB 2423034A
Authority
GB
United Kingdom
Prior art keywords
housing
hose
valve
spray
opening
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.)
Granted
Application number
GB0602651A
Other versions
GB0602651D0 (en
GB2423034B (en
Inventor
Joao Jorge Bergner
Juergen Stoeger
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 DE102005006360A priority Critical patent/DE102005006360A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB0602651D0 publication Critical patent/GB0602651D0/en
Publication of GB2423034A publication Critical patent/GB2423034A/en
Application granted granted Critical
Publication of GB2423034B publication Critical patent/GB2423034B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0081Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30Nozzles, 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
    • B05B1/3033Nozzles, 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 the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304Nozzles, 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 the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046Nozzles, 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 the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30Nozzles, 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
    • B05B1/32Nozzles, 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24Spraying 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
    • B05B7/2402Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2416Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/02Processes for applying liquids or other fluent materials performed by spraying

Abstract

A spray gun for operation at an air compressor 12 is indicated, with a hose connecting piece for taking off compressed air and a hose connecting piece for taking off suction power, which has a gun housing 15 with a hose connection 17 for an air hose 13 to the air compressor and a spray nozzle 41 as well as a spray medium supply pipe 20 opening in the air flow path 19 between hose connection 17 and spray nozzle 41. To prevent damage to the air compressor in the event that the air hose 13 connected to the spray gun is inadvertently connected wrongly to the hose connecting piece for taking off suction power, a check valve 22 with a blocking direction pointing towards the hose connection 17 is arranged in the section of the air flow path 19 lying between the hose connection 17 and the opening 21 of the spray medium supply pipe 20.

Description

R. 310265 23.12.04 ROBERT BOSCH GMBH, 70442 Stuttgart Spray gun

Prior art

The invention starts out from a spray gun for operation at an air compressor, which has a hose connecting piece for taking off compressed air and a hose connecting piece for taking off suction power, according to the preamble of claim 1.

Some types of air compressors, in particular so-called HVLP (High Volume Low Pressure) compressors, can operate in blowing and suction mode and for each operating mode have a separate hose connecting piece for putting on an air hose connected to an appliance, such as a spray gun or suction pipe. To be able to use the same air hose for conducting air to the appliances, the hose connecting piece for taking off compressed air and the hose connecting piece for taking off suction power are formed identically. The danger thereby arises that the air hose is placed mistakenly on the incorrect hose connecting piece, which is unsuitable for the operating mode of the appliance connected at the other end of the air hose. If the air hose connected to a spray gun for example is put onto the hose connecting piece for the suction power, then spray medium is sucked via the spray medium supply pipe into the compressor on commencement of the spraying operation due to the suction effect of the air compressor, which can cause not inconsiderable damage to the compressor.

R. 310265 Advantages of the invention The spray gun according to the invention with the features of claim 1 has the advantage that if the air hose is mistakenly put onto the wrong hose connecting piece on the air compressor, any aspiration of spray medium through the closed check valve is reliably prevented. The constantly closed check valve is only opened by the compressed air supplied by the compressor, so that the spray gun can only operate if the air hose has been put onto the correct hose connecting piece on the compressor, namely onto the hose connecting piece for taking off compressed air.

Due to the measures cited in the further claims, advantageous developments and improvements of the spray gun indicated in claim 1 are possible.

Drawing The invention is explained in greater detail in the following description with reference to practical examples shown in the drawing.

Fig. 1 shows a schematic representation of a spraying apparatus with air compressor and spray gun, Fig. 2 and 3 each show a side view of the spray gun in Fig. 1, partly cut away, with closed check valve (Fig. 2) and open check valve (Fig. 3), R. 310265 Fig. 4 shows a spray gun according to Fig. 2 with modified check valve.

Description of the practical examples

The spraying apparatus shown in schematic representation in Fig. 1 comprises a spray gun 11, an air compressor 12, preferably an HVLP (High Volume Low Pressure) compressor, and an air hose 13 for supplying air from the air compressor 12 to the spray gun 11. The air compressor 12 is designed such that it can both generate compressed air and make suction power available. To this end the air compressor 12 has two hose connecting pieces, to be precise a hose connecting piece that cannot be seen here for taking off compressed air, termed pressure connecting piece in short, onto which the air hose 13 shown in Fig. 1 has been placed, and a hose connecting piece 14 for taking off suction power, termed suction connecting piece 14 in short.

A suction pipe can be connected to this suction connecting piece 14, for example via an air hose. To be able to use the air hose 13 alternately for the spray gun 11 and as an air hose for the suction pipe, the two hose connecting pieces are executed identically. The user therefore has to pay careful attention that he pushes the air hose 13 onto the permissible hose connecting piece on the air compressor 12 in each case for operating the spray gun 11 and the suction pipe.

The spray gun 11 shown enlarged in a side view and partly cut away in Fig. 2 has a gun housing 15 with handle 39 and R. 310265 a spray medium container 16 attached detachably to the gun housing 15. Formed at one end of the gun housing 15 is a hose connection 17 for the air hose 13, and at the end of the gun housing 15 facing away from the hose connection 17 is a spray head 40 with integral spray nozzle 41. The spray nozzle 41 has a spray opening 42, a nozzle needle 43 controlling the spray opening 42 and a closing spring 44, which presses the nozzle needle 43 onto a seat surrounding the spray opening 42 on the spray head 40 and thereby closes the spray opening 42. Between the hose connection 17 and the spray nozzle 41 an air flow path 19 is enclosed by the gun housing 15. In this air flow path 19 a spray medium supply pipe 20 opens close to the spray nozzle 41, which pipe opens at its other pipe end into the spray medium container 16. Arranged in the air flow path 19 between the hose connection 17 and the opening 21 of the spray medium supply pipe 20 is a check valve 22. The check valve 22 is inserted into the air flow path 19 in such a way that its blocking direction points to the hose connection 17. The check valve 22 has in a known manner a valve opening 23, a valve closing organ 24 and a valve closing spring 25, which acts upon the valve closing organ 24 in the direction of closing the valve. The check valve 22 is closed in the pressureless state prevailing in the housing interior and is opened by the compressed air flowing in via the hose connection 17. In the event that the air hose 13 is inadvertently connected to the suction connecting piece 14, it is thereby prevented that spray medium is aspirated from the spray medium container 16 and sucked into the air compressor 12, which would cause not inconsiderable damage to the air compressor 12. The user R. 310265 can notice the incorrect adaptation of the air hose 13 on the air compressor 12 due to the fact that the spray gun 11 does not work. Once the air hose 13 has been switched to the pressure connecting piece of the air compressor 12 the spraying operation can be started.

In the check valve 22 shown in Fig. 2 in the closed state and in Fig. 3 in the open state, the valve opening 23 is formed by a wall opening 26, which is let into a housing cross-wall 27 arranged in the air flow path 19. The valve closing organ 24 is formed by a pivoting flap 28, which is held pivotably on the side of the housing cross-wall 27 facing away from the hose connection 17. The valve closing spring 25 is formed by a compression spring 29, which is supported on the one hand on the pivoting flap 28, to be precise on its rear side facing away from the valve opening 23, and on the other hand on a spring plate 30. In the practical example of Fig. 2 and 3, the spring plate 30 is formed by a second housing cross- wall 31, which is arranged at an axial distance from the first housing cross-wall 27 and is provided with air penetration holes 32. If no compressed air is present at the hose connection 17, as the compressor 12 is not switched on, or if the hose connection is connected to the suction connecting piece 14 when the air compressor 12 is switched on, then the check valve 22 takes up the closed position shown in Fig. 2. If the air hose 13 is placed in an accurate manner onto the pressure connecting piece and the air compressor 12 switched on, then the check valve 22 assumes its open position shown in Fig. 3. By actuating an operating lever 33 a timeselectable spraying process can now be triggered. To this R. 310265 end an operating lever 33 situated ahead of the handle 39 and held pivotably on the housing 11 is connected via a traction cable 45 to the nozzle needle 43, so that by pivoting the operating lever 33 the nozzle needle 43 is moved against the resetting force of the closing spring 44 and the spray opening 42 is released.

The modified spray gun shown in Fig. 4 differs from the spray gun 11 described previously only due to another constructive formation of the check valve. In this check valve 22' the valve opening 23 is surrounded by a valve seat 34, which interacts with the valve closing organ 24 to release and close the valve opening 23. Valve seat 34 and valve opening 23 are formed here by an annular radial web 35 moulded onto the gun housing 15, the inner annular surface 351 of which web is in the form of a truncated cone and encloses an opening 36 tapering in the direction of the hose connection 17. The valve closing organ 24 is formed by a cone body 37 guided axially movably in the gun housing 15. The angle of slope of the surface area of the cone body 37 corresponds to the angle of slope of the inner annular surface 351 of the radial web 35, so that the cone body 37 is able to lie with its surface area flat on the inner annular surface 351 of the radial web 35. The valve closing spring 25 is again formed as a compression spring 29, which is supported on the one hand on the cone body 37 and on the other hand on the spring plate 30, which is formed in the same manner as with the check valve 22 in Fig. 2 and 3 by the second housing cross-wall 31. The compression spring 29 is taken up here on the spring plate R. 310265 side on a guide pin 38 protruding axially from the housing cross- wall 31.

The check valve 22' is shown in the closed state in Fig. 4, the cone body 37 partially protruding through the opening 36. The surface of the cone body 37 protruding through forms a pressure impingement surface for the compressed air present at the hose connection 17. If the air hose 13 pushed onto the hose connection 17 is connected correctly to the air compressor 12, hence pushed onto the pressure connecting piece, then the cone body 37 is moved to the right in Fig. 4 against the resetting force of the compression spring 29 by the compressed air acting on this pressure surface of the cone body 37. The cone body 37 lifts off the valve seat 34, and the compressed air can now flow via the annular gap between cone body 37 and inner annular surface 351 of the radial web 35 towards the spray nozzle 41.

Claims (8)

  1. R. 310265 23.12.04 ROBERT BOSCH GMBH, 70442 Stuttgart Claims 1. Spray gun
    for operation at an air compressor (12), which has a hose connecting piece for taking off compressed air and a hose connecting piece (14) for taking off suction power, with a gun housing (15), which has a hose connection (17) for an air hose (13) to the air compressor (12) and a spray nozzle (41), and with a spray medium supply pipe (20) opening in the air flow path (19) between hose connection (17) and spray nozzle (41), characterized in that arranged in the section of the air flow path (19) lying between the hose connection (17) and the opening (21) of the spray medium supply pipe (20) is a check valve (22; 22') with a blocking direction pointing towards the hose connection (17)
  2. 2. Spray gun according to claim 1, characterized in that the check valve (22) has a valve opening (23) , a valve closing organ (24) and a valve closing spring (25) acting on the valve closing organ (24) in the valve closing direction and that the valve opening (23) is formed by a wall opening (26) in a housing cross-wall (27) arranged in the air flow path (19), the valve closing organ (24) by a pivoting flap (28) held pivotably on the housing cross-wall (27) on its side facing away from the hose connection (17) and the valve R. 310265 closing spring (25) by a compression spring (29), which is supported on the one hand on the pivoting flap (28) on its side facing away from the wall opening (26) and on the other hand on a spring plate (30) fixed in the housing.
  3. 3. Spray gun according to claim 1, characterized in that the check valve (22') has a valve opening (23) , a valve seat (34) surrounding the valve opening (23), a valve closing organ (24) and a valve closing spring (25) pressing the valve closing organ (24) onto the valve seat (34) and that the valve seat (34) is formed by an annular radial web (35) moulded onto the gun housing (15), the inner annular surface (351) of which web, enclosing an opening (36) tapering towards the hose connection (17) , is formed as a truncated cone, the valve closing organ (24) is formed by a cone body (37) that is axially movable in the gun housing (15), which body lies with its surface area on the annular surface (351) and protrudes partly through the opening (36), and the valve closing spring (25) is formed by a compression spring (29) , which is supported on the one hand on the cone body (37) on its rear side facing away from the hose connection (17) and on the other hand on a spring plate (30) fixed in the housing.
  4. 4. Spray gun according to claim 2 or 3, characterized in that the spring plate (30) fixed in the housing is formed by a second housing cross-wall (31) with air penetration holes (32), which is arranged at an axial R. 310265 distance from the first housing cross-wall (27) in the air flow path (19)
  5. 5. Spray gun according to claim 4, characterized in that the compression spring (29) is pushed with its spring end on the housing cross-wall side onto a guide pin (38) protruding axially from the second housing cross- wafl (31)
  6. 6. Spray gun according to one of claims 1 - 5, characterized in that the spray medium supply pipe (20) opens into a spray medium container (16)
  7. 7. Spray gun according to claim 6, characterized in that the spray medium container (16) is attached detachably to the gun housing (15)
  8. 8. A spray gun substantially as herein described with reference the accompanying drawings.
GB0602651A 2005-02-11 2006-02-09 Spray gun and associated check valve arrangement Expired - Fee Related GB2423034B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102005006360A DE102005006360A1 (en) 2005-02-11 2005-02-11 spray gun

Publications (3)

Publication Number Publication Date
GB0602651D0 GB0602651D0 (en) 2006-03-22
GB2423034A true GB2423034A (en) 2006-08-16
GB2423034B GB2423034B (en) 2007-06-13

Family

ID=36119819

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0602651A Expired - Fee Related GB2423034B (en) 2005-02-11 2006-02-09 Spray gun and associated check valve arrangement

Country Status (3)

Country Link
CN (1) CN1817480A (en)
DE (1) DE102005006360A1 (en)
GB (1) GB2423034B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446785A (en) * 2007-02-20 2008-08-27 Sandra Quirk Foam spraying device
EP3351309A1 (en) * 2017-01-22 2018-07-25 Graco Minnesota Inc. Check valve with nonlinear force load for hvlp spraying

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008000389A1 (en) * 2008-02-25 2009-08-27 Robert Bosch Gmbh A spray gun system
DE102008000400A1 (en) * 2008-02-25 2009-08-27 Robert Bosch Gmbh Transportable paint sprayer
DE102008000396A1 (en) * 2008-02-25 2009-08-27 Robert Bosch Gmbh Spray gun with an extension device for extending the handle of the spray gun
DE102008000394A1 (en) * 2008-02-25 2009-08-27 Robert Bosch Gmbh A spray gun system
US7971806B2 (en) * 2008-12-30 2011-07-05 Graco Minnesota Inc. Poppet check valve for air-assisted spray gun
CN103521377B (en) * 2013-09-30 2016-03-30 无锡夕阳康科技有限公司 Multi-functional suction-jet type spray gun

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1272530A (en) * 1969-05-15 1972-05-03 Spraying Systems Co Spray guns
US4630642A (en) * 1984-12-03 1986-12-23 Tom Mcguane Industries, Inc. Check valve and water injection systems and fuel systems utilizing the same
GB2180778A (en) * 1985-09-24 1987-04-08 Azzimonti Giovanni Mec Srl Air-delivery adjusting device in a spray-gun
JPH02261559A (en) * 1989-03-31 1990-10-24 Nichibei:Kk Spray gun
EP0464282A2 (en) * 1990-06-18 1992-01-08 Copeland Corporation Scroll compressor discharge valve
US5388767A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with check valve
US5918628A (en) * 1997-06-17 1999-07-06 Parker-Hannifin Corporation Multi-stage check valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1272530A (en) * 1969-05-15 1972-05-03 Spraying Systems Co Spray guns
US4630642A (en) * 1984-12-03 1986-12-23 Tom Mcguane Industries, Inc. Check valve and water injection systems and fuel systems utilizing the same
GB2180778A (en) * 1985-09-24 1987-04-08 Azzimonti Giovanni Mec Srl Air-delivery adjusting device in a spray-gun
JPH02261559A (en) * 1989-03-31 1990-10-24 Nichibei:Kk Spray gun
EP0464282A2 (en) * 1990-06-18 1992-01-08 Copeland Corporation Scroll compressor discharge valve
US5388767A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with check valve
US5918628A (en) * 1997-06-17 1999-07-06 Parker-Hannifin Corporation Multi-stage check valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446785A (en) * 2007-02-20 2008-08-27 Sandra Quirk Foam spraying device
EP3351309A1 (en) * 2017-01-22 2018-07-25 Graco Minnesota Inc. Check valve with nonlinear force load for hvlp spraying
US10589301B2 (en) 2017-01-22 2020-03-17 Graco Minnesota Inc. Check valve with nonlinear force load for HVLP spraying

Also Published As

Publication number Publication date
DE102005006360A1 (en) 2006-08-24
GB2423034B (en) 2007-06-13
GB0602651D0 (en) 2006-03-22
CN1817480A (en) 2006-08-16

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100209