Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
  • B08B3/02—Cleaning by the force of jets or sprays
  • B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
  • B08B3/028—Spray guns
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B2230/00—Other cleaning aspects applicable to all B08B range
  • B08B2230/01—Cleaning with steam

Definitions

• the invention relates to a handpiece for a steam jet apparatus with a
• a housing having an inlet for a supply line and an outlet for a discharge line and in which a metering valve is arranged with a valve housing in which a linearly displaceable in a direction of displacement valve body is mounted, wherein the valve body with a housing movably held Actuator is coupled, which is movable by the user against the action of a spring force.
• Such handpieces are used in steam blasting equipment, such as those used in the household for cleaning.
• the steam jet devices comprise a steam generator with which steam can be generated, which can then be supplied to the handpiece via a supply line. With the help of the handpiece, the water vapor can be directed to a surface to be cleaned.
• the amount of steam delivered per unit of time can be metered by the user.
• a metering valve with a linearly displaceable valve body which can be moved by the user by means of an actuator.
• a valve opening more or less freely that is, a flow cross-section of the metering valve can be adjusted by the user to dose the amount of steam to be delivered.
• Such handpieces are known for example from DE 44 43 795 C2 and DE 298 16 208 U l. It has also been proposed, for example in EP 0 715 827 A2, to arrange an electrical switch in the handpiece with which the steam supply from the steam jet device to the handpiece can be switched on and off. Such a switch can be used in addition to the metering valve.
• the actuation of the metering valve is carried out in the known from DE 44 43 795 C2 handpiece with the aid of a setting wheel to which a gear is formed.
• the gear meshes with a rack, which is integrally connected to the valve body.
• the thumbwheel can be rotated only by overcoming a certain torque, since it is coupled to the housing of the handpiece via a frictional or elastic connection. Such a configuration may result in the valve maintaining its position even when the hand piece slips off the user. This entails the risk that unintentionally steam is released.
• a return spring is proposed in DE 298 16 208 Ul, which exerts a restoring force on the actuator, so that the actuator when it is released by the user, automatically assumes a rest position in which the flow cross-section the metering valve is minimal.
• the risk of inadvertently giving off steam when the handpiece slips off the user is thereby reduced.
• the return spring of the known from DE 298 16 208 Ul handpiece is designed as a helical compression spring which is clamped between the actuator and a stop of the housing. If the actuator is moved from its rest position, so the return spring compressed and bent to the side. If the user releases the actuator, the return spring pushes the actuator back to the rest position, the actuator pushes the valve body back to its original position.
• the return spring pushes the actuator back to the rest position, the actuator pushes the valve body back to its original position.
• Object of the present invention is to develop a handpiece of the generic type such that it allows a particularly sensitive dosage of the steam delivery.
• the arrangement of at least one spring element laterally adjacent to the valve body in such a way that the valve body is acted upon by a spring force oriented parallel to the displacement direction permits a nearly transverse force-free movement of the valve body, so that the danger is very low that the valve body jams. Under the action of the force acting on the valve body restoring force, this automatically assumes a rest position limiting the flow cross-section of the metering valve when the user releases the actuating member.
• the actuator is coupled to the valve body and can be moved by the user against the action of the force acting on the valve body spring force from its rest position to increase the flow area of the metering valve.
• the almost transverse force-free movement of the valve body makes it possible to meter the delivery of steam very sensitively.
• the handpiece has two spring elements, which are arranged on opposite sides of the valve housing and act on the valve body aligned parallel to the direction of displacement spring forces is particularly advantageous.
• the valve housing in which the valve body is held displaceably, is arranged in such an embodiment between two spring elements, which respectively act on the valve body.
• the spring forces exerted by the spring elements are aligned parallel to the direction of displacement of the valve body.
• the handpiece has more than two spring elements, wherein all spring elements exert a parallel to the direction of displacement of the valve body aligned spring force on the valve body.
• the at least one spring element of the handpiece as
• Tension spring designed.
• a helical tension spring has proven to be advantageous.
• the at least one spring element is clamped between the valve body and the valve housing.
• Housing can be pre-assembled, wherein the valve body is inserted into the valve housing and the at least one spring element is fixed on the one hand on the valve housing and on the other hand on the valve body.
• the pre-assembled dosing valve can then be inserted into the housing of the handpiece.
• the valve body comprises a sliding part, which is immersed in a receiving space of the valve housing and is displaceably guided on the inner wall, and two projecting from the receiving space, projecting from the sliding part in different directions holding parts, which each engages a spring element.
• the sliding part can be designed, for example, bolt-like. In particular, a cylindrical configuration of the sliding part has proven to be advantageous.
• valve body is designed in a T-shape.
• the valve body has a central sliding part in the manner of a shank, from which two holding parts in the manner of side arms protrude at right angles in directions facing away from one another.
• the metering valve is designed as a closing valve, with which the steam delivery can be completely interrupted.
• valve housing forms a valve seat to which the valve body is sealingly applied.
• the valve seat may for example be designed in the form of an inner shoulder or step, to which the valve body in a closed position is sealingly applied.
• the valve body comprises at least one sealing ring which surrounds the valve body in the circumferential direction.
• the flow cross-section of the metering valve is continuously variable by the valve body in response to its position in the valve housing more or less releases the flow area of the metering valve.
• the change in the flow cross-section is carried out in stages.
• the user can choose between different metering ranges, wherein the flow cross-section of the metering valve expands in stages between two metering.
• the metering valve can be opened in a first displacement region of the valve body up to a first maximum flow cross-section and can be opened in a second displacement region of the valve body to a second maximum flow cross-section, wherein the second maximum flow cross-section is greater than the first maximum flow cross section.
• the flow cross-section can increase abruptly.
• valve body is formed in stages. This allows a structurally simple way a gradual transition from a first flow cross-section to a second flow cross-section of the metering valve.
• the actuating member is preferably designed as a pivot lever, which is pivotally mounted on the housing about a pivot axis, wherein the pivot axis in a the metering valve facing away from the rear portion of the
• Swivel lever is arranged.
• the positioning of the pivot axis in as large a distance as possible to the metering valve makes it possible to the valve body to move over a relatively large valve travel. This in turn allows a particularly sensitive metering of the amount of steam to be dispensed per unit of time.
• the actuator is coupled to the valve body.
• the coupling takes place via a slotted guide.
• a coupling of the pivot lever to the valve body via a slotted guide in particular in the embodiment of the actuating member as a pivot lever, a coupling of the pivot lever to the valve body via a slotted guide.
• pivot lever is directly coupled to the valve body, without additional mechanical transmission elements are used. This reduces the number of components of the handpiece and thereby facilitates its assembly.
• the actuator in the form of a pivot lever, it is advantageous if this has at least one receptacle at its front end section remote from the pivot axis, in which a driver of the valve body is movably held.
• the receptacle of the pivot lever can be configured for example in the form of a groove, a slot or in the form of a slot.
• the pivot lever has at its front end portion facing away from the pivot axis two extensions which receive at least one end portion of the valve housing between them and are coupled via a slotted guide with the valve body.
• the extensions each have a receptacle for a driver of the valve body.
• the extensions can slide along opposite outer sides of the valve body.
• an actuatable by the actuator electrical switch is arranged in the housing for switching on and off the steam supply from the steam jet device.
• Steam delivery in the manner described above are controlled by means of the metering valve and the actuator.
• the steam supply can be switched on and off by means of the actuator and the electric switch.
• steam can only be supplied to the handpiece by the steam jet device when the user actuates the electrical switch in the handpiece by means of the actuating element.
• the actuation takes place against the action of the spring force, which acts on the valve body and is transmitted from this to the actuator. If the steam supply has been switched on, the user can very sensitively dose the amount of steam delivered by the handpiece per unit of time by moving the actuating member counter to the acting spring force. If he releases the actuator again, this is due to the acting spring force automatically back to its rest position and the steam supply is turned off.
• the pivot axis is arranged in a the metering valve remote rear pivot lever section, it is advantageous if the switch in the area is positioned between the pivot axis of the pivot lever and the metering valve.
• the actuator is preferably lockable. It is favorable if the actuating element can be locked in its rest position, in which the flow cross-section of the metering valve is minimal. The risk that unintentionally steam is released, can be kept very low.
• the range of motion of the actuator is adjustable by means of an actuator. It can be provided, for example, that the user can choose between a smaller and a larger range of motion of the actuator. If he chooses the smaller range of motion, he can change the flow area of the metering valve, starting from a minimum value to an intermediate value. On the other hand, if he chooses the larger range of movement of the actuator, he can change the flow area of the metering valve from its minimum value on the intermediate value up to a maximum value. The actuator can thus only be moved until it assumes an end position specified by the actuator.
• the actuator may for example be designed in the form of a setting wheel which is rotatably mounted on the housing and having a cam which limits the range of movement of the actuating member. It is particularly favorable when the actuator can be locked in its rest position by means of the actuator.
• the actuator thus assumes the function, the range of motion of the actuator, on the one hand admit, and in addition, the actuator takes over the function of locking the actuator in its rest position.
• a separate discharge line can connect to the metering valve. This can be connected with the interposition of a sealing element to the valve housing.
• the discharge line is integrally formed on the valve housing.
• Dispensing line and valve housing can thus form a one-piece component.
• An additional sealing element between the discharge line and the valve housing can be omitted.
• Figure 1 is a longitudinal sectional view through a first embodiment of a handpiece according to the invention
• Figure 2 is a sectional view taken along the line 2-2 in Figure 1;
• FIG. 3 shows a longitudinal sectional view of a second embodiment of a handpiece according to the invention and FIG. 4 shows a sectional view along the line 4-4 in FIG. 3.
• FIGS. 1 and 2 show a first embodiment of a handpiece according to the invention, which is referenced 10 overall is. It comprises a housing 12 which is formed by two interconnected, preferably screwed or riveted half shells 14, 16. It is designed substantially tubular and has an inlet section 18 and an outlet section 20, which merge into one another to form an angle of the order of 45 °.
• the input section 18 has, on its rear side 22 facing away from the outlet section 20, an inlet 24, into which a supply line 26 connects, which connects the handpiece 10 to a steam jet device, not shown in the drawing, and supplies hot steam to the handpiece 10.
• the supply line 26 comprises a protective tube 28, which is clamped between the two half-shells 14 and 16 and surrounds a steam-carrying inner tube 30.
• the inner tube 30 extends within the housing 12 up to its output section 20, in which a metering valve 32 is arranged with a valve housing 34, which comprises a hose nipple 36, to which the inner tube 30 is connected.
• the hose nipple 36 opens into a receiving space 38 of the valve housing 34 to which an inwardly directed step 40, which forms a valve seat, integrally connects a discharge line 42 having a free end 44 facing away from the input section 18 end 46 of the output section 20 stands out. In the region of the end face 46, the output section 20 forms an outlet 48, which is penetrated by the free end 44 of the discharge line 42.
• the receiving space 38 of the valve housing 34 is aligned colinearly to the discharge line 42 and has a rear open end 50 at a distance from the mouth region of the hose nipple 36.
• a T-shaped valve body 52 with a sliding part in the form of a central shaft 54 emerges.
• the shaft 54 is slidably guided on the inner wall 56 of the receiving space 38 and extends with a front end portion 58 in the direction of discharge line 42 to over the stage 40 of the valve housing 34.
• the shaft 54 is surrounded by a front sealing ring 60, which in the illustrated in Figures 1 and 2 closed position of the metering valve 32 at the valve seat forming a step 40 sealingly.
• the shaft 54 of the valve body 52 has a lateral flattening 62.
• the shaft 54 is surrounded by a rear sealing ring 64, which bears sealingly against the inner wall 56 of the receiving space 38.
• the rear sealing ring 64 is arranged at a distance from the step 40 in the receiving space 38 and ensures that over the hose nipple 36 in the receiving space 38 incoming steam can not escape via the open end 50 of the receiving space to the rear.
• the shaft 54 protrudes with its rear end region out of the receiving space 38. In its projecting area, it carries two holding parts in the form of a first side arm 66 and a second side arm 68, which project in perpendicular directions from the shaft 54 in opposite directions.
• the valve housing 34 has, in the direction of the discharge line 42 at a distance from the step 40, a first holding wing 70 and a second holding wing 72, which are aligned parallel to the side arms 66, 68. Between the first retaining wing 70 and the first side arm 66, a first closing spring 74 is inserted. clamped and between the second retaining wing 72 and the second side arm 68, a second closing spring 76 is clamped.
• the two closing springs 74, 76 are each designed as helical tension springs and act on the valve body 52 with parallel to the shaft 54 aligned spring forces. Contrary to the action of the spring forces, the valve body 52, starting from its closed position shown in FIGS.
• the front sealing ring 60 lifts off from the step 40 and releases a flow cross-section of the metering valve 32. If the flattening 62 of the shaft 54 reaches the step 40, the throughflow cross section of the metering valve 32 suddenly increases.
• the handpiece 10 comprises an actuating member in the form of a pivoting lever 78, which is pivotable about a pivot axis 80 and engages with an actuating portion 82 in the input portion 18, a housing opening 84 and can be detected by the user.
• the pivot axis 80 is arranged in a metering valve 32 facing away from the rear end portion 86 of the pivot lever 78 and therefore has a considerable distance from the metering valve 32.
• the pivot lever 78 In its dosing valve 32 facing the front end portion 88, the pivot lever 78 has a first extension 90 and a second extension 92, which receive a rear end portion of the valve housing 34 and between a first guide slot 94 and a second guide slot 96 have.
• the first guide slot 94 is penetrated by the first side arm 66 of the valve body 52 and the second guide slot 96 is penetrated by the second side arm 68 of the Valve body 52 penetrated.
• the two side arms 66 and 68 form carriers, which in combination with the guide slots 94 and 96 when pivoting the pivot lever 78 transmit its pivoting movement in the manner of a slotted guide into a linear displacement movement of the valve body 52. If the pivoting lever 78 is pivoted clockwise in the housing 12 from its rest position shown in FIG.
• valve body 52 is thereby displaced to the rear so that the throughflow cross section of the metering valve 32 is increased, the front sealing ring 60 being at a distance from the step 40 occupies, so that on the inner tube 30 and the hose nipple 36 in the valve housing 34 incoming steam pass through the stage 40 and can be discharged via the integrally connected to the metering valve 32 discharge line 42.
• the valve body 52 is acted upon here by the two closing springs 74, 76 with aligned parallel to the direction of displacement spring forces.
• the movement of the pivot lever 78 thus takes place counter to the action of the force exerted by the closing springs 74, 76 spring forces. If the user releases the pivoting lever, the valve body 52 automatically moves into its closed position, in which the front sealing ring 60 sealingly bears against the step 40, thereby interrupting the flow path for the steam.
• an actuator in the form of a setting wheel 98 is rotatably mounted in the housing 12, which protrudes through an opening 100 of the housing 12 from the housing 12 partially outwardly and within the housing 12 a radially outward directed cam 102 carries, which cooperates with a setting wheel 98 facing abutment surface 104 of the pivot lever 78.
• the setting wheel 98 acts via a latching connection with an inside the housing half shell 14 integrally formed locking lug 106 together, with the aid of the adjusting wheel 98 can be fixed in three positions.
• a first position of the setting wheel 98 is shown in FIG. In this position, the cam 102 bears against the abutment surface 104 of the pivoting lever 78, so that it is locked in its rest position. He can not be pivoted inward thus.
• the adjusting wheel 98 can be pivoted in Figure 1 counterclockwise in a second position in which the cam 102 occupies a first, relatively small distance from the contact surface 104 of the pivot lever 78 in its rest position. This makes it possible to pivot the pivot lever 78 over a first range of motion and thus to move the valve body 52 over a first displacement range.
• the setting wheel 98 can be pivoted counterclockwise in a third position.
• the cam 102 takes a relatively large distance to the contact surface 104 of the pivot lever 78 in its rest position. This makes it possible to pivot the pivot lever 78 over a relatively large range of motion and thus to move the valve body 52 over a large displacement range.
• FIGS. 3 and 4 show a second embodiment of a handpiece according to the invention, which is referenced 110 overall. This is designed substantially identical to that described above with reference to Figures 1 and 2 handpiece 10. For identical components, therefore, the same reference numerals are used in Figures 3 and 4 as in Figures 1 and 2 and to avoid repetition is with respect These components referred to the above explanations.
• a valve body 112 which is surrounded by a single sealing ring 114, is used in the handpiece 110.
• the sealing ring 114 is arranged at a distance from the step 40 in the receiving space 38 and ensures that steam can not escape via the open end 50 of the receiving space 38 to the rear.
• the function of the sealing ring 114 thus corresponds to the function of the rear sealing ring 64 of the handpiece 10th
• a sealing of the receiving space 38 in the region of the step 40 in the direction of the discharge line 42 is not required for the handpiece 110 in the rest position of the pivot lever 78, since with the aid of an electrical switch 116, the supply of steam from the steam jet device to the handpiece 110 can be electrically controlled.
• the supply of steam from the steam jet device to the handpiece 110 can be electrically controlled.
• the pivoting lever 78 can then be pivoted further inwardly into the housing 12, wherein the switching cam 122 pushes the switch plunger 120 into a housing of the electrical switch 116, without changing the switching position of the switch 116.
• the amount of steam to be dispensed in a similar manner as in the handpiece 10 by means of the pivot lever 78 and the metering valve 32 are metered. If the user releases the pivoting lever 78 again, this is pivoted back by the closing springs 74, 76 via the valve body 52 into its rest position and the steam supply is switched off by means of the electric switch 116.
• the valve body 52 is guided friction in the receiving space 38 of the valve housing 34, wherein it is subject to virtually no lateral forces.
• the two closing springs 74 and 76 it is acted upon with parallel to the direction of displacement spring forces. The risk that the valve body 52 jammed in the valve housing 34, there is practically no. The steam output can thus be metered very sensitively.
• the two closing springs 74 and 76 are arranged in the output section 20 of the housing 12 laterally adjacent to the valve housing 34. As a result, in the input section 18 between the actuating portion 82 of the pivot lever 78 and the inner tube 30, a clearance can be created for the arrangement of the electrical switch 116.
• the handpieces 10 and 110 are thus characterized not only by a very sensitive metering of the amount of steam to be dispensed but also by a cost-effective production.

Landscapes

• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Lift Valve (AREA)
• Surgical Instruments (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Nozzles (AREA)
• Coating Apparatus (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43589530

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Citations (5)

Family Cites Families (5)

• 2009
  • 2009-12-10 DE DE102009059044A patent/DE102009059044A1/de not_active Withdrawn
• 2010
  • 2010-11-23 ES ES10787349.9T patent/ES2449306T3/es active Active
  • 2010-11-23 JP JP2012542438A patent/JP5364851B2/ja active Active
  • 2010-11-23 WO PCT/EP2010/068033 patent/WO2011069819A1/de active Application Filing
  • 2010-11-23 EP EP10787349.9A patent/EP2509722B1/de active Active
  • 2010-11-23 CN CN201080056214.0A patent/CN102655952B/zh active Active

Patent Citations (5)

Also Published As

Similar Documents

Legal Events