DE2822047A1 - FROST PROTECTION FOR HIGH PRESSURE CLEANING DEVICES - Google Patents

Description

Frost protection for high pressure cleaning devices

The invention relates to a frost protection device High-pressure cleaning devices, in particular a protection against freezing of the spray lance, in the lance body A shut-off valve which can be manually operated via an operating lever is arranged, with which via a first valve caliper the under high pressure water flow can be controlled and is kept closed in the idle state by the high pressure applied to the valve at the inlet u / ird.

High-pressure cleaning devices mentioned at the beginning are for example known from DT-PS 2 3D4 738, DT-OS 2 346 412 and DT-OS 2 346 413. On the revelation of which we are full referred to in terms of content.

High-pressure cleaning devices are set up outdoors and should also be suitable for (winter operation the operating parts of the high-pressure cleaning device in one arranged enclosed housing. The spray lance (or also several spray lances) is arranged on the outside of the housing and is not against freezing at freezing temperatures protected. There are protective regulations that

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stipulate that the hand-operated shut-off valve installed in Lanzenkörpsr the spray lance is attached when released of the operating lever (idle state) the water flow should close completely, with the shut-off valve through the high water pressure at the valve inlet is closed held ujird. This regulation is therefore necessary that if the LanzB is dropped, it should be avoided, that the shut-off valve opens unintentionally and the hot water under high pressure in an uncontrolled manner into the environment splashed. Due to the recoil of the spray lance lying on the ground and not being held, then takes place an uncontrolled distribution of the spray jet in the environment. This regulation is effective in winter operation disadvantageous insofar as freezing of the spray lance is possible. After the shut-off valve is completely must be closed, a standing water column forms in the spray lance, which freezes and at freezing temperatures leads to damage to the connection hoses and the spray lance.

The object of the present invention is to provide a frost protection device with high pressure cleaning devices, especially one Protection against freezing of the spray lance, to propose, with which a freezing safe with relatively little Aufiuand avoided luird.

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This object is thereby achieved in accordance with the present invention solved that when the UJasser high pressure drops at the valve inlet of the shut-off valve, a control member has a low Passage cross-section to maintain the flow of a Releases the minimum amount of water at the shut-off valve.

An essential feature of the present invention is therefore that a control element interacts with the shut-off valve, that when the water pressure drops for the flow ainer lYlindestiuassermenqe ensures through the spray lance, so that due to the minimum flow through the spray lance sin Avoid freezing. It is essential that the Passage cross-section (leak opening) only when the High water pressure is released so that the above-described Regulation is fulfilled that in the case of underwater high pressure the Shut-off valve must be completely closed. Due to leaks at the shut-off valve, the one at the shut-off valve drops pending high water pressure when the system is idle within one or more hours, and / or the shut-off valve remains closed. If the falling water pressure now reaches a certain minimum pressure (e.g. 10 atm Compared to 70 atm operating pressure), then the control unit opens a small passage cross-section (leak opening) and thus coffins for the flow of a Pflindestujassermengs through the spray lance and thus prevents the formation of a standing water column that can freeze.

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In a first embodiment of the present invention the control member is formed from in the passage cross-section controllable bypass openings within the first valve piston, luobei now, according to the present invention, a second valve caliper is arranged in the first u-valve piston, the flow cross-section between the bypass openings controls. It is essential here that the bypass openings bridge the sealing seat of the shut-off valve, which is closed in the idle state, so that despite the non-actuated Actuating lever a minimum flow rate through the spray lance is annualized. The control of the steering body in Dependence on a low pressure takes place in that the second u-valve piston against its valve seat at high water pressure against the force of a spring closes the flow cross-section, so that the bypass openings bsi high water pressure are locked; and when the water pressure is low, the force of the spring releases the flow cross-section. this means that within the first valve piston, which is assigned to the manually operated shut-off valve, a second Valve piston is arranged, which is below in the opening direction the force of a spring is loaded. If a high water pressure acts on the second valve piston, the valve seat becomes closed and a flow through the bypass openings is prevented. If the water pressure drops, it moves Spring the second valve piston in the opening direction, and lifts the valve piston from its valve seat, whereby

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now Bin DU _r chfluOqUBrschnitt is released within the bypass openings.

In the pressure unit from, for example, 1D atü to almost over D atü So there would be a minimum flow through the spray lance flow and prevent freezing of the waterways inside the spray lance and the connection hoses. The underground flow but would only flow as long as there is still pressure from the dBtn high pressure system before the shut-off valve is present. is If this pressure had dropped to zero, then no further water flow would take place and the spray lance would no longer take place would freeze anyway. To avoid this, it is provided in a further embodiment of the present invention, that a low-pressure short-circuit circuit is arranged parallel to the high-pressure circuit of the high-pressure cleaning system is. This low-pressure short-circuit bridges the high-pressure circuit, i.e. also when the pressure in the The high-pressure circuit becomes a low-pressure short-circuit circuit (Minimum amount of water made available so that the minimum flow can flow for any length of time. One end of the low-pressure short circuit starts directly at the UJasserzula uf the high-pressure cleaning system and flows into the connection end of the spray lance, so that the minimum flow taken directly from the water supply by the spray lance will .

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In a further embodiment of the present invention is the control device that guarantees the lYlindost flow depending on the pressure upstream of the shut-off valve, as a time-controlledB arranged on the housing of the washing system fluidischo (hydraulic or pneumatic) piston-cylinder unit, the piston rod on the actuating lever of the shut-off valve attacks, and at frost temperature Bend the operating lever in the opening direction.

This embodiment differs from the first one Embodiment · in that now no longer the pressure upstream of the Sporrventil by the control organ measured, but that the temperature is measured directly and, depending on the temperature, a piston-cylinder unit with its piston rod on the actuating lever dos shut-off valve attacks and the Actuating lever in the opening direction in terms of maintenance a minimum flow rate through the spray zone emotional. This exemplary embodiment assumes that the Sprühlanzo is held on a bracket outside the housing on the housing and that a piston-cylinder unit on the housing is arranged, the piston rod engages the actuating lever of the shut-off valve.

In another embodiment of the present invention it is provided that the control unit as a temperature

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controlled Stollmotor is formed, the actuating arm engages on the operating lever of the shut-off valve, and at Frost temperature doors the operating lever in the opening direction in the sense of maintaining a minimum flow moved by the spray lance. This embodiment too requires that diB SprühlanzB on a bracket on the housing gshaltert is, and that on the housing itself the servomotor is arranged, which engages with its actuating arm on the Bstichtunghebe1 of the shut-off valve of the spray lance.

Several embodiments of the present invention will now be described in more detail with reference to the drawings. In doing so, more can be found in the drawings and their description Advantages and features of the invention.

Show it :

Fig. 1 is a schematic representation of the U / water curve on it Honing pressure cleaning device with the representation of a Low pressure short circuit;

Fig. 2 Vortical section through a shut-off valve, which in The lance body of the spray lances according to FIG. 1 is installed, the valve piston 20 'from the Tschnik belongs and according to the invention by a valve piston is replaced according to Figures 3 and 4;

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3 shows a partial view of a Uertika section through sinen U-valve piston according to the present invention ·;

FIG. 4 overall view of the valve piston according to FIG. 3;

Fig. 5 schematically drawn representation of the second embodiment of the control member :;

FIG. 6 shows a plan view according to FIG. 5 in the direction of dBS arrow UI.

In Fig. 1, the water circuit is a conventional high pressure exercise machine indicated schematically, ujie ar for example from the three publications mentioned at the beginning is known. This known water cycle consists of the U-water inlet 1, to which the water flows in the direction of the arrow 2 and after passing through the transition 3 in direction of the arrow B into the high-pressure washing system 9 is running. The high-density and water enriched with cleaning agents or preservatives then flows through the high-pressure line 10 in the direction of arrow 17 in the one on the high pressure line 10 spray lances 11, 12 connected in parallel. Here, the spray lance 11 is equipped with a high pressure nozzle and the Spray lance 12 with a low pressure nozzle and a washing brush. The respective shut-off valves, not shown in detail, of the spray lances 11, 12 are in the lance bodies Brn 15, 16 arranged and are through the BBtendunghsbel 13,14

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manually operated.

As explained at the outset, the present invention provides a bypass line 4 between the junction 3 at the Ulasser inlet 1 and the inlet side of the spray lances 11, 12 before. The minimum water level that occurs when the high water pressure drops flows through the spray lance 11, 12 at the valve inlet of the shut-off valve, then it is not released from the Removed high pressure line 10, but flows starting from the branch 3 in the direction of arrow 5 via the bypass line 4 and the shut-off valve 6 as well as the double check valve 7 into the spray lances 11, 12 to achieve freezing to avoid frost temperatures. It was initially already pointed out that the bypass line 4 is provided in a preferred embodiment so that the at Freezing temperatures minimum flowing water amount any Time can flow, would this amount of water - in the absence of it the bypass line 4 - are taken from the high pressure line, this would also be possible. These However, the amount of water would only flow for a limited time, provided that in the high pressure system of the cleaning system 9 nothing special Precautions are taken.

The double check valve 7 is in a preferred embodiment of the present invention provided so that during the operating state of the cleaning system 9

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water flowing to the spray lances 11, 12 in the direction of arrow 17 not via the bypass line 4 in the opposite direction to the direction of arrow 5 in the U / water inlet pushed back. The stopcock 6 is closed in summer and open in winter to allow a flow in the summer a lYlindestujassBruppe through the spray lances 11,12 to avoid.

In the following drawings 2 to 4 it is now shown ujie in a first embodiment of the present invention the flow of a minimum amount of water when it is reached the frost temperature is guaranteed by the spray lances 11, 12 ujird.

Fig. 2 shows a valve body 5G, on dsm a flange 18 is attached, which is assigned to the water inlet and a flange 19 which is outflow on the Ilia ssb. On the flange 18 so the water flows from the high pressure line 10 into the lance body 15,16 of the spray lances 11,12 and exits from the flange 19 in Pfailrichtung 24 the Wentilkörper 50, provided that the pivotally mounted at the pivot point 41 operating lever 13, ^ k in the indicated arrow direction is operated by hand.

It should now be noted that the valve piston 20 'shown in Fig. 2 belongs to the prior art and the following description, referring to the valve piston

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and whose function relates, only serves to better illustrate the invention.

The valve piston 20 'is located in the illustrated Position in the closed position, uieil the valve seat 23 sealing on the seal 22 rests. The operating lever 13, 14 displaced in the direction of the arrow, so it is the valve piston 20 'moved upwards so that the valve seat 23 releases the ring seal 22 and the water in the direction of the arrow 27 flows through from flange 18 to flange 19.

The following description relates to the essentials of the invention Features of the present invention. According to the invention it is now provided that the conventional, valve piston 20 belonging to the prior art by a The valve piston shown in FIG. 4 is replaced. This valve piston 20 shown in FIG. 4 is shown enlarged in partial axial section in FIG. 3. In its external structure, i.e., its outer contours, the valve piston 20 shown in Figs. 3 and 4 corresponds exactly to that shown in Fig. 2 Valve piston 20 '. That is, the valve piston 20 is insertable in the valve body 50 shown in FIG the valve seat 23 rests against the seal 22. The seal 22 is only indicated in FIG. 3; however, all are that Valve body 50 associated parts can be seen in FIG. It is now essential to the present invention that

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that in the idle state, i.e. when the operating lever is not actuated 13,14, the water pressure acting on the pressure plate 42 from the high pressure line 10 the valve under the force of the Spring 21 (not shown in Fig. 3) keeps closed, in which the valve seat 23 to the seal 22 as shown in Fig. 3 and pressed. If the actuating lever 13, 14 is pivoted, the valve body 20 moves axially lifted up and the pressure cup flows in direction of the arrow between the valve seat 23 and the seal 22 through and reaches the flange 19, ωο it then in the direction of arrow 24 in the high-pressure or low-pressure nozzle of the spray lance 11, 12 flows in.

The main difference of the present invention is that, according to FIG. 3, the valve piston 20 is an axial Has bore 25 which, for manufacturing reasons, is sealed at the top by a threaded bolt 26, It is essential here that bypass openings 31 are upstream of the valve seat 23 and further bypass openings 34 downstream of the valve seat 23, which are connected to one another through the axial bore 25.

If now UJasser high pressure is applied to the flange 18, the entire valve piston 20 due to the force of the faders 21 and due to the water pressure on the pressure plate 42 in a sealing manner (valve seat 23) pressed against the sealing surface 22. Equal

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measure the high pressure via the bypass opening 31 and the axial bore 25 on the pressure plate 28 of the second valve piston 3D arranged in the interior of the valve piston 20, so that its valve seat 33 is pressed against the inner seal 43. The UJasserdurohfluss in the direction of the arrow 32 through the bypass line is hereby closed.

If the water pressure drops from, for example, 70 atmospheres to 10 atü ab, then add an appropriately dimensioned one Schujach spring 29 the valve piston 30 axially upwards, so that the valve seat 33 releases the sealing surface 43 and the water flows in the direction of arrow 32 into the bypass bore 31 and downstream of the valve seat 23 assigned to the first valve piston leaves the bypass bore 34. When the High water pressure to a certain low pressure is released .also the flow cross-section of the bypass openings 31,25,34 and a certain minimum amount of water flows into the Spray lance and thus prevents a standing water column, so that freezing is avoided.

If, however, high water pressure on the flange 18 of the shut-off valve is applied, the valve piston 30 is pressed against the force of the spring 29 with its valve seat 33 against the seal 43, so that the entire shut-off valve remains closed.

5 and 6 is a second embodiment of the

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• *

f?

present invention shown schematically. The control organ controls the flow of the minimum amount of auxiliary water not dependent on the U-water pressure applied to the shut-off valve. Rather, the control takes place in Dependence on the temperature. For this purpose, a piston-cylinder unit is on the housing 38 of the high-pressure cleaning system arranged, which in the exemplary embodiment consists of a piston 36 which is displaceable in a cylinder 35. At the Piston 36 attaches a piston rod 37 which, with its free end, is attached to the actuating lever 13, 14 of the shut-off valve of the spray lance 11.12 is applied. The control of the piston-cylinder unit 35,36,37 now takes place in such a way that when freezing temperatures are reached the piston 36 is moved in the direction of the arrow 40, so that, according to FIG. 6, the actuating lever 13, 14 in the direction of the arrow 40 is moved and thereby the shut-off valve is opened in order to allow the flow of a certain [YlindestwassBrvol to allow.

In a further embodiment not shown in detail the control unit can also be used as a temperature-controlled servomotor be designed, the actuating arm engages the actuating lever 13, 14 of the shut-off valve, and at freezing temperatures the operating lever 13,14 in the opening direction to Moved passage of a certain minimum amount of water.

It is only essential for all implementation examples that the

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Freezing of the spray lances 11, 12 is avoided by the fact that when the system is idle, i.e. when the system is not operated Operating lever 13,14, a minimum flow through the Spray lances 11, 12 cause ujird. This will be elaborate electrical heaters avoided.

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Claims (7)

B InI * Applicant: Firns Guido Oberdörfer,
UJorkstraßB 22, 7919 Be l Claims ή. Früstschutzsichsrung boi high-pressure cleaning devices, in particular securing the freezing of the spray lance, in the lance body of which there is a shut-off valve / valve that can be manually operated via an actuating lever, with which the through-flow of water supplied under high pressure can be monitored via a first valve piston and that is at high pressure when the water inlet is at rest is kept closed, characterized in that a control element is used to lower the high water pressure at the valve inlet of the shut-off valve
(29, 30; 35,36,37) βϊπθπ small passage cross-section for 909847/0434 F-er nsp rougher Remote hchri 'iber liprerhznrt Bank accounts Lindau (B ' No • tiih Lind.ui ■ Β » Ni 1.89 Lindau (O8'iS: ^ji GW 05 4 374 according to Veremhnrunq B'iyer club bank ι change -B Bayer Hypotht.-ken-t Preservation of the flow of a quantity of lYlinduasserat Shut-off valve releases. 2. Frost protection device according to claim 1, characterized in that the stowage organ (29,3G) is formed from bypass openings (31,34) within the first valve piston with controllable flow cross-section (2U), and that in the flow cross section (33) of the EJyps connections (31,34) t) in the second valve piston (30) to— guordnut, which is contrary to the force at high mass pressure A spring (29) closes the flow cross-section (33) and at low water pressure with the force of the spring (29) releases the flow cross section (33). 3. Frost protection device according to claim 2, characterized characterized in that the bypass openings (31,34) are controllable in cross section with the one connecting them The flow cross-section bridge the valve seat (23) of the first valve piston (20). 4. Frost protection according to one or more of the preceding claims, characterized that the second valve piston (30) under the force of the spring (29) its valve seat (33) approximately at a pressure of 1G atü releases. 909847/0434 - 3 - 5. Frost protection according to one or more of the preceding claims, characterized in that the high pressure circuit (10) the The cleaning system is short-circuited by a bypass line (4) which is connected to the inlet side at the UJasserzula (1) the spray lance (11,12) connects, and that in the bypass line (4) a shut-off valve (6) and a double check valve (7) are arranged. 6. Frost protection device according to claim 1, characterized in that the control member (35,36,37) is formed from a temperature-controlled fluidischsn arranged on the housing of the washing system Piston-cylinder unit (35,36,37), the Bn piston rod (37) acts on the actuating lever (13,14) of the shut-off valve, and in freezing temperatures the actuating lever (13,14) in Opening direction determined. 7. Frost protection device according to claim 1, characterized in that the control member as temperature-controlled servomotor is formed whose Actuating arm on the actuating lever (13, 14) of the shut-off valve angrBift, and at freezing temperatures the actuating lever (13,14) is moved in the opening direction. 8847/043 4 -4-