DE1943630C - Device for displaying the flow of a medium - Google Patents

Description

on and allows the fluid to flow through by offering it a flattened cross section in such a way that along the envelope 5 a relatively high speed withdraws. The change in temperature of the resistor is determined immediately, which means that the circulation of the medium in the channel is immediately detected will. On the other hand, as soon as the flow is interrupted, the membrane reverses 11 back to its original position in which the thermal insulation of resistance is ensured. the resistance instantly changing to a different temperature

achieved.

It can thus be seen that a device according to the measure according to the invention does not have any Has inertia in operation, and proves to be very easy to manufacture and assemble.

1 sheet of drawings

Claims (3)

Fluid arranged and flowed through by a constant or in patent claims: approximately constant current when this fluid is immobile and at a speed 1. Device / in order to display the flow being moved. These known electrical or eleccmcs medium with an electrical _{resistance, which is heated by ironic means, however, L:} ne has a relatively constant current. high functional inertia. be it when checking the temperature level in contact with the presence of a flow rate or, in the case of the medium, the presence or absence of checking the interruption of a flow rate. It is possible to determine whether there is a circulation, in particular if it is a fluid such as water, characterized in that it is a matter of which, as is known, has a high heat storage capacity which forms a heat-insulating barrier. This disadvantage results from having bodies which, under the action of a from the fact that the electrical resistance is imclastic force when the medium is at rest at the mer in contact with the medium,
electrical resistance applied to each maintenance The invention is specified in claim 1. mekontakt between the nichtzirkulierenden 15, the object of the function of inertia of a medium and this resistor (3) to prevent such a testing device to avoid this by the the occurrence and at resistance to a flow only when the medium is flowing through the detector arrangement due to which it is in thermal contact. when the pressure difference arises automatically from The display device according to the invention has the resistance stands out, whereby the thermal 20 has the advantage that the temperature compensation Contact between the test resistor and the setting faster, reducing the response time of the Medium can be produced. Device is reduced. 2. Device according to claim 1. thereby advantageous developments of the invention are characterizing.it. that the insulating body is described in the subclaims. a thermally insulating, resilient membrane 35- An example embodiment of the invention (11) consists. * application should now be explained in more detail using the drawing 3. Device according to An.piuch2, characterized in that a section through a Prüfvork indicates that the flexible membrane (11) direction is shown. This can be found in a channel opposite a threshold ..n flow channel of which at 1 and 2 the inlet or outlet pipes is arranged so that the passage cross 3 »are shown, mount. The display device Section of the moving medium according to the invention comprises an electrical resistor between the electrical resistor (3) and stand 3, which is in a thermally insulated plug 4 the resilient membrane (11), when attached to, which is itself removed from an electrically suffering resistor, flattened border envelope 5 is enveloped; The arrangement can be in and thus a greater speed limit can be introduced into a shaft 6, which is located in the pipe 1 were used against the thermal contact surface 'les is recessed in such a way that the resistor 3 with the Resistance favors in the channel circulating medium in contact. An access plug 7 holds the casing 5 and thus the plug in a defined position on the floor. 40 of the shaft 6 and ensures a seal through the seal 8. The resistor can also be easily dismantled. The known devices for displaying the resistor 3 is connected via terminals 9 and 10 Presence of a flow usually indicate a fed. Mechanism comprising a membrane on which- 45 On the opposite of the resistor Ren surfaces or pages one the pressure difference on part is a flexible membrane 11 from a Due to the flow of water through a calibrated, heat-insulating membrane, which is resistant to the corrosive opening or through a negative pressure organ, the medium-resistant membrane acts against the leaves, which is of the Venturi type, with plug 4 also held pressed by the spring 12, the a sliding connection rod is provided which connects the 50 to the movement of this membrane, e.g. B. on a control stroke 13 acts. of the organ, which is either an access plug 14 serves as a bearing for the valve, a closing flap or an electrical contact of the 12 and supplies the acting on the membrane can act. Power. An opening 15 provided in the membrane The main disadvantage of this known device 55 is in connection with the channel is to be seen in the fact that its mode of operation because of the outlet side and the chamber 16.
the necessary presence of a sealing The test device is in a state without fluid circulation systems between the sliding link rod and kulation. The membrane 11 is located the box filled with water in which the spring 112 makes contact Membrane is not very safe. 60 with the test resistor 3, which on the basis of this fact The service life of this sealing system is a matter of itself not in contact with the medium also uncertain, since there will be pressing processes or blocks. The membrane does not only serve as an insulating one cations and corrosion processes. Thermal barrier, but also as a barrier against the In order to remedy the aforementioned disadvantages, there is fluid circulation in the pipe 1 or in the outlet pipe 2.
attempts have already been made to display devices 65 as soon as a fluid movement begins, that is, as soon as the flow of a medium is used, which is based on a relative overpressure in the pipe 1 compared to the temperature change that prevails in a counter pipe 2, the front one rises Part of the memstand suffers, which is in thermal contact with the bran by itself against the action of the spring 12