DE1943630A1 - Device for checking the circulation of media - Google Patents

Description

Harne, 8000 Munich 25, Frelllgrathttraße 19 4St I 1 I UUDk Elsenacher Straße 17

i «- DipL-ing. R. n. Nanr p, L. Anw. ■ · «> ■ ·,

H.rrminn-Tr.nl.pohl DI D I.-PH VS. Eduard ΒβΙΖίθΓ Telephone: 398011

Telephone: 509 30 r W 39 8012

'»« 2 Diploma lng. W. Herrmann-Trentepohl ³ ' ⁸⁰¹³

Telegram address:. . "_ Telegram address

Bahrpatente Herne PATENTANWÄLTE Babetzpat Munich

Telex 08229853 Telex 05 245 62 '

Γ ~ ■ I bank accounts:

Bayrische Vereinsbank Munich 952287

194363Q

Dresdner Bank AG Herne 20243 « Postal check account Dortmund 55868

L J

Ref .: MO 1817

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Saunier Duval, Paris, France

Device for checking the circulation of media

The invention relates to a test device for Circulation of fluids or media, hereinafter referred to as media, and in particular to a device for testing the Circulation of water that is intended to be used on mixed grass boilers with electronic actuation and control to become, these are boilers in which the opening of a tap for hot water automatically starts and to bring about the regulation of the various organs.

It is known that household mixers and boilers do so are designed so that they can also be used for hot water central heating a room and the supply of wara water

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of this space, it becomes necessary to proceed in such a way that the function with regard to the production of sanitary hot water Torrang has compared to the heating function, this necessity resulting from the fact that already from the derfinition in a mixed gas boiler, these two functions can be fulfilled by a single burner and a single combustion chamber.

In the case of mixing boilers, using the general principles of the operation of the usual devices for instantaneous Generation of warm water by the gas are own, i.e. gas-heated warm water and hot water or. Pool water heaters, this priority is given to the extraction function, generally derived from a device which is activated by the occurrence of hot water circulation in the withdrawal circuit for hot sanitary water.

This device works under the influence of the opening of a Hot water tap, it works either through direct mechanical action or through indirect action such as by opening or closing an electrical contact, on the actuators and controls for the gas circuit and the Water circuits of the boiler, such that the function of the Production of hot water with priority is met.

These devices operated by the water circulation are almost always formed at the moment by a mechanism comprising a membrane, on the faces or sides of which the pressure difference due to the water flow is made to act through a calibrated orifice or through a vacuum device of the venturi type , wherein eineGleitverbindungsstange also provided, which transmits the movements of this membrane on the overall _r controlled organ, which may be a closing flap or electrical contact either.

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The main disadvantage of this known device is to be seen in that their functioning is due to the necessary presence of a sealing system between the sliding connection rod and the box filled with water in which the membrane is located, is not very sure.

The AbäiehuixgsBysterae against water and especially against warm water, If there are sliding pieces, they are quite delicate in their functioning, and their service life is uncertain; are seeded out they press operations or blockages due to. An.pres.s- and Corrosion processes.

In order to remedy the aforementioned disadvantages, attempts have already been made To use test equipment for the circulation of the medium, which was based on the temperature change that a resistance suffers, which is arranged in thermal contact with the fluid and is traversed by a constant or approximately constant current, if this fluid moves immobile and at a speed will; these known electrical or electronic devices however, have a further disadvantage, which is that their inertia is when checking their existence a flow rate or more often when checking the interruption a flow rate if it is a fluid like It is water, which is known to have an increased heat storage capacity, this disadvantage resulting from the fact that the electrical resistance is always in contact with the medium.

The test device according to the invention for media circulation which forms the subject of the invention, now wants this above Disadvantages outlined completely-in! Let cease to exist by a new simple and extremely reliable solution is proposed.

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ORiOINAL INSPECTED

194363Q

The invention is essentially characterized in that a test device is used for the fluid circulation that on * the known principle of changing the value of an electrical resistance works, which is preferably of the type with non-linear Change as a function of temperature, and is heated by an approximately constant current and the effect of cooling of the medium whose circulation does not exist or presence determined in combination with a device should be, the effect of which is such that when it does not exist a fluid circulation is the thermal contact between the test resistor and the fluid is removed by a heat insulating

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Barrier is interposed and that when a Circulation or a fluid flow through the arrangement of the new test device the thermal contact between the test resistor and the fluid by removing this thermal barrier is restored.

According to a preferred embodiment of the invention, this combined with the Widerstandsprüfgerät device consists of a flexible membrane heat-insulating material which is request confirm against the effects of the fluid, wherein said membrane ^Λ designed such that in the absence of fluid circulation it is pushed completely against the metallic surface , through which the thermal contact between the resistor and the fluid is established ", and that when a fluid circulation occurs, it moves away by itself from this surface under the influence of the movement of the medium, in such a way that instantaneous thermal contact between the one in motion Fluid and the resistance is established.

In another feature of the invention, there is the membrane j when in rest position against the thermal contact surface of the resistance is pressed, also in contact with the Section or threshold of a partition that does the job

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a lock against the fluid circulation takes over, such that immediately after the fluid has come into circulation, the part of the membrane surface which is located in front of this partition causes the result will raise itself to let fluid through, in-d * m this is offered a flattened passage cross-section, of a significant speed gradient against the favors thermal contact surface of the resistor.

An example embodiment of the invention will now be based on the accompanying drawing will be explained in more detail, in which a section through a test device is shown. These can be installed in a channel from which the inlet or outlet pipes are turned off at 1 and 2. The fluid circulation tester according to the invention comprises an electrical test resistor 3, which is in a thermally insulated plug 4 is attached, which is itself enveloped by an electrically conductive sheath 5; the arrangement can be placed in a shaft 6 are introduced, which is recessed in the tube 1, deraart that the resistor 3 balances the circulating in the channel.

An access plug 7 holds the sheath 5 and thus the plug in place a defined Stelling on the floor of the shaft 6 and ensures a seal through the seal 8. Also is easy dismantling of the resistor possible.

Resistor 3 is fed via connections 9 and 10.

On the part opposite the resistor, a flexible membrane 11 is made of a wärmrei soli he endem and-against the Corrosive effects of the medium resistant membrane held pressed against the plug 4 by the spring 12, which is on the with the membrane 11 firmly connected stop 13 acts.

A tongue plug 14 serves as a bearing for the spring 12 and provides the weight acting on the membrane. An opening 15 provided in the membrane is in connection with the

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Canal and Chamber 16.

The test device is shown in a state with no fluid circulation. The membrane 11 is under pressure the spring 12 in contact with the test resistor 3, due to this fact itself not in contact with the. Medium is coming. This membrane serves not only as an insulating thermal barrier but also as a barrier against the fluid circulation in the pipe 1 or in the outlet pipe 2.

Once fluid movement begins, ie, äobald in the pipe 1, a relative pressure versus above that prevailing in the pipe 2, ^v of the front part of the diaphragm 11 tries to raise itself against the action of the spring 12 and allows the fluid by p .by this is offered a flattened cross-section in such a way that this fluid tries to flow along the envelope 5 at a relatively high speed. The change in temperature of the resistor is determined immediately, which means that the circulation of the medium in the duct is detected immediately. As soon as the flow ^{1 is} interrupted, however, the membrane 11 returns to its starting position, in which the thermal insulation of the resistor is ensured, the resistor immediately reaching a constant temperature, a characteristic for the light circulation of the fluid.

It can thus be seen that a device according to the invention Measure does not show any inertia in operation and itself proves to be very easy to manufacture and assemble.

The detector for the fluid circulation thus comprises, according to the embodiment shown, an electrical resistor 3, the is used in combination with a device that is a heat insulating barrier such that a compliant Diaphragm 11 is pressed against the resistance and any thermal Contact between this and the medium is avoided. As soon as fluid circulation begins, the membrane rises;

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there is a heat exchange between the fluid and the resistor, whose temperature change makes it possible to immediately determine the presence of a circulation.

Claims

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Claims (3)

Claims / Device for plaguing and checking the circulation- one Medium or a! Fluid, with an electrical through a constant current heated resistor, its temperature change in contact with the medium, the presence or absence of it allows a circulation to be determined, characterized in that the detector for the fluid circulation in combination with a heat-insulating barrier Device is used which is normally "pushed" against the electrical resistance; and "any thermal contact between the non-circulating medium and this resistance when it occurs a circulation or a fluid flow through the Detector arrangement to prevent the thermal contact between the test resistor and the medium by elimination this insulating barrier can be restored. 2. Apparatus according to claim 1, characterized in that the insulating barrier is formed by a heat insulating; compliant membrane, which is pressed intimately against the resistance in such a way that the occurrence of an eluid circulation it from Resistance removed, which is immediately in thermal contact with the moving medium. 3. Apparatus according to claim 2, characterized in that the compliant membrane in the vicinity of a partition wall of the inlet channel is arranged such that the passage cross section of the in Movement located Plüids between the electrical resistance and the flexible membrane, when this is removed from this resistance, is flattened and thus a larger one Favored speed gradients against the thermal contact surface of the resistor. 00 9 8 10 / U50S