DE2644851A1 - Gas filler for sound damping panels - has gas detector with reference and measuring resistors for valve control - Google Patents

Abstract

The gas filler for noise damping plates has nozzle with a blocking valve connected to the inlet of the noise damping plate. A gas detector is connected to the connection nozzles of an air outlet opening of the plate to be filled. The gas detector (7) has a measuring resistor (8) and reference resistor (9), both having temperature coefficients of resistance. The resistors are heated to the same temperature and held in separated chambers (10, 11). The measuring chamber (10) is connected to the connection nozzle (6). The reference chamber is connected only with the atmosphere. The electrically controlled stop valve (4) is operated by the temperature change of the measuring resistor (8).

Description

Vvnri cntun # -, to Gasa. ' U ~ of foam insulation disks.

The invention relates to a device for gas filling of sound insulation panels, consisting of a shut-off valve and an opening of the to filling sound insulation disk to be connected as well as from a with a connection piece to an air outlet opening of the pane to be filled to be connected gas detector.

It is known to improve the sound insulation of an insulating glass pane to fill the air gap with a gas that has both a has better sound and thermal insulation values. For this it has Sulfur hexafluoride proved to be particularly suitable.

Around the air in the space between an insulating glass pane against sulfur hexafluoride to be exchanged is via a lower one, in the space between the insulating glass pane leading opening the gas with a pressure of 0.05 bar via a shut-off valve and introduced a gas filler neck very slowly. To a mixture of the initiated To prevent gas with the air in the space between the panes, must the introduction of the gas very slowly and accordingly over a long period of time take place. A gas filling level of at least 80% is aimed for. The one from the gas Air displaced from the space between the panes escapes through an upper opening in which is plugged into a connection piece of a gas detector.

The latter is used to determine the degree of filling of the sound insulation panel and should thus enable the shut-off valve to be closed in good time.

So far, this control option has been mostly used with very primitive means carried out. For example, the gas flow emerging from the outlet opening is into a vessel with a burning candle. A gas detector known per se would be too expensive for the intended purpose and also unsuitable because respectively only one sound insulation panel could be precisely monitored. The devices used so far thus all require a great deal of time by the operating personnel.

The invention is based on the object explained at the outset To improve the device so that the sound insulation gas filling carried out more cost-effectively can be.

This object is achieved according to the invention in that the gas detector comprises a measuring resistor and a reference resistor, both of which are negative Have temperature coefficients, heated to the same temperature and in one another separate chambers are housed, of which the measuring chamber with the connecting piece is in communication, while the reference chamber only exchanges air with the atmosphere Connection stands, which is due to a change in temperature of the measuring resistor resulting change in resistance after conversion into an electrical signal that is electrical controlled shut-off valve applied.

The heating of the two resistors carried out via a supply voltage can be done at about 700 C. When the gas filling is complete, gas emerges from the upper one Disk opening and thereby acts on the heated measuring resistor. There the thermal conductivity of this gas is worse than that of air, results from the Measuring resistor poorer heat dissipation and a corresponding increase in temperature. This leads to a change in resistance and therefore a change in voltage, which produces an electrical signal. This can be amplified electronically and then serves to close the z.fl. shut-off valve designed as a solenoid valve, whereby the further gas filling is interrupted immediately.

Tests have shown that depending on the filling speed and accordingly Outflow velocity of the gas from the upper 'disk opening at certain Flow conditions through the outflowing gas a cooling of the measuring resistor occurs, so that a negative electrical signal is obtained in the case of the invention Device is not being processed. To fix the- This difficulty is there expedient if the measuring resistor is arranged in a pot-shaped housing that is open at the top is, the bottom of which is directed opposite to the gas flow entering the outlet nozzle is. The gas emerging from the sound insulation panel thus flows to the side of the cup-shaped housing past upwards and emerges from the above this housing Measuring chamber into the atmosphere. However, since the gas is heavier than air, it flows a part of the: escaping gas over the free edge of the housing wall into the cup-shaped housing and does not act on the measuring resistor here is more directly exposed to the exiting gas flow.

Since every temperature change caused from outside the measuring device deß Casdetektors can interfere, it is advantageous if above the pot-shaped Housing and a heat shield at a distance from it, e.g. a Can be aluminum foil.

For the same reason, there can be a distance in front of the air exchange opening or the air exchange openings of the reference chamber, a heat shield is provided be.

Finally, to simplify operation, it can be advantageous if the signal generated by the change in temperature of the measuring resistor also produced an optical or acoustic signal | triggers.

In a modified embodiment, the measuring chamber and reference chamber can be used spatially close, separated from each other by a partition, in a common be housed cup-shaped housing, which is preferably made of a material with low thermal conductivity. This ensures that any Temperature fluctuations in the environment affect both chambers equally.

With the new device it is possible for the first time to have several locks filling with gas at the same time without any personnel expenditure for filling controls, each disc is precisely electronically monitored individually. With the Device not only several disks, but also disks of any and different Size to be filled. The device is particularly easy to attach because the Gas filler neck and the connecting piece only in bores of a spacer need to be inserted into the sound insulation panel.

The new device works maintenance-free, with day and night operation possible, as no more personnel are required to monitor the gas filling. It is operated with harmless low voltage.

In the drawing, an exemplary embodiment is shown in FIG Invention shown schematically. They show: FIG. 1 in side view and in part In a longitudinal section, a sound insulation panel with an attached device for gas filling and FIG. 2 shows a cross section along the line II-II in FIG.

The illustrated sound insulation panel 1 has a filling opening 2, into which a gas filler neck 3 is inserted, which is equipped with a shut-off valve 4 is. The gas is supplied via a gas bottle and an intermediate fitting to reduce the gas pressure.

In an air outlet opening 5 of the sound insulation panel 1 is a connection piece 6 of a gas detector 7 inserted. The latter includes a measuring resistor 8 and one Reference resistor 9, both of which have a negative temperature coefficient and are heated to the same temperature via a supply voltage. The two Resistors 8,9 are housed in separate chambers 10,11, from which the measuring chamber 10 is in communication with the connecting piece 6, while the Reference chamber 11 via an air exchange opening 12 only exchanges air with the atmosphere Connection.

Measuring chamber 10 and reference chamber 11 are spatially tight, only through a partition 17 separated from one another, in a common pot-shaped housing 13 housed, the bottom 13a of the gas flow entering the connecting piece 6 is opposite. This gas flow is via channels 14 on the side wall 13 guided along upwards, where it comes out of the Gas detector leaks into the atmosphere. However, part of this gas stream flows because of the higher specific weight of the gas over the edge of the housing into the housing 13 and acts on the measuring resistor 8 located there.

The cup-shaped housing 13 is covered by a heat shield 15, while the air exchange opening of the reference chamber 11 by a corresponding Heat shield 16 is protected in the form of a sheet metal jacket.

Due to a change in temperature of the Mefi resistor 8 resulting change in resistance is shown in a circuit not shown converted into an electrical signal and electronically amplified and can then be used a line 18 acts on the shut-off valve 4, which is designed as an electric solenoid valve.

Claims (7)

"Device for the gas filling of shell panes" 2 patent claims: 1. Device for the gas filling of Schalldammscheibatn, consisting of a with. provided with a shut-off valve and to an opening of the sound insulation panel to be filled to be connected gas filler neck as well as from one with a connecting piece an air outlet opening of the pane to be filled, gas detector to be connected, it is noted that the gas detector (7) has a measuring resistor (8) and a reference resistor (9), both of which have a negative temperature coefficient have, heated to the same temperature and in separate chambers (10,11) are accommodated, of which the measuring chamber (10) with the connecting piece (6) is in communication, while the reference chamber (11) only with the atmosphere is in air-exchanging connection, which is due to a change in temperature of the measuring resistor (8) resulting change in resistance after conversion into an electrical one Signal applied to the electrically controlled shut-off valve (4). 2. Apparatus according to claim 1, characterized in that the measuring resistor (8) is arranged in a pot-shaped housing (13) open at the top, the bottom of which (13a) is directed in the opposite direction to the gas flow entering the connecting piece (6). 3. Apparatus according to claim 1 or 2, characterized in that a heat shield above the cup-shaped housing (13) and at a distance therefrom (15) is provided. 4 Device according to claim 1, 2 or 3, characterized in that at a distance in front of the air exchange opening (s) (12) or - A heat shield (16) is provided for the openings of the reference chamber (11) is 5. Device according to one of the preceding claims, characterized in that that the signal generated by the temperature change of the measuring resistor (8) also triggers an optical or acoustic signal. 6. Device according to one of the preceding claims, characterized in that that the measuring chamber (10) and the reference chamber (11) are spatially sealed by a partition (17) separated from each other, housed in a common pot-shaped housing (13) are. 7. Apparatus according to claim 6, characterized in that the common Cup-shaped housing (13) made of a material with a low coefficient of thermal conductivity consists.