DE1005251B - Gas-heated instantaneous water heater - Google Patents

Description

Gas-fired water heater The invention relates to a Gas-heated instantaneous water heater with a dynamic pressure difference appealing water switch that controls the burner gas valve. So far you have one such water switch is generally designed in such a way that when it occurs a certain pressure difference the burner gas valve is fully opened.

It is also known to design the burner gas valve as a control valve and to increase the gas supply, the greater the dynamic occurring at the water switch Pressure difference becomes.

The device according to the invention differs from this in that the heating power of the water heater increases when the amount of water is increased automatically reduced.

According to the invention, the arrangement is made so that the N @ 'water deficiency protection responds normally when a minimum amount of water passes through, but that when Increase in the pressure difference and the resulting increase in the water switch stroke a throttling of the gas supply, preferably by an additional one with the gas valve connected throttle body takes place.

Such a reduction in the heating power when the amount of water increases has the following meaning: The normal heating output of a flow heater is dimensioned in such a way that that in winter at relatively low cold water temperatures a certain amount of water can be brought to hot water temperature. If you have such normal heating power in summer z. B. wants to receive only moderately heated water for showering, so you have to either sending an excessive amount of water through the device or a great deal Mix in cold water. So you get moderate at summer temperatures of the cold water heated shower water only in unsuitably large quantities. So far you have this The problem was remedied by setting the burner small by hand and thereby reduced the heating power of the water heater. This is awkward, especially when the water heater is not in the shower room, but z. B. in the kitchen is hung. By contrast, the invention creates the possibility of to automatically reduce the heating power by increasing the amount of water, that is to control the burner remotely through the water. So it takes place in the sense according to the invention, a progressive decrease in temperature by increasing the amount of water instead, so that you can use cool water in relatively small quantities even in summer can be found.

Such an automatic lowering of the heating power can of course also take place in that the water switch at an increased pressure difference controlled burner gas valve individual parts one of several separately fed Parts of the existing burner switches off. `? If the heating output is reduced, a If an increased amount of water flows through the radiator, there is a risk that it will is cooled too much, so that undesirably condensation forms. That can be avoided in a further embodiment of the invention that the water switch a bypass channel through a valve in the waterway parallel to the radiator is controlled in such a way that when the burner output is reduced by the radiator The amount of water flowing is reduced and some of the water through the 1Tebenschlußkanal is directed. By controlling the bypass channel, the enlarged, The amount of water acting on the water switch is divided into one for cooling the radiator sufficient and this penetrating partial flow and one past the radiator partial flow flowing through the bypass channel.

A spring-loaded control body is expediently in the hot water outlet arranged as a water volume regulator, the spring loading of which from the outside, preferably according to a temperature scale, is adjustable.

The invention is based on two schematically illustrated exemplary embodiments explained in more detail.

In Fig. 1, the cold water inlet is denoted by 1. On a flowering thrush 2 a pressure difference arises when the water flows through the channels 3, 4 is transferred to the two chambers 5, 6 of a membrane water switch 7. That Cold water flows through line 9 and a slide valve housing 10, then through a line 11 to the radiator 12, to which a nozzle 13 closed dispensing line 14 is connected. From the dispensing line 14 leads a bypass channel 15 to the valve housing 10.

The gas flowing in at 16 passes through a burner gas valve 17, the is loaded with a valve spring 18 to the burner 19.

The valve body 17 is connected to the diaphragm by a valve rod 20 of the water switch 7 connected. On the valve rod 20 is a conical one Control body 21 attached, which with the passage cross section of the valve 17 is a variable Throttle valve forms. They also sit on the valve rod 20, which is the valve housing 10 penetrates, two valve pistons 22, 23, one of which, 22, the mouth of the Shunt channel 15 and the other of the mouth of the line 11 is assigned. At the The nozzle 13 is opened by the dynamic pressure difference in the chambers 5, 6 raised the membrane of the water switch 7 and thereby in a known manner the burner gas valve 17 is open. The amount of water is increased by further turning up of the nozzle 13 is enlarged, the pressure difference increases and causes one further stroke of the water switch 7, so that the control body 21 in the passage opening occurs and the gas supply to the burner 19 throttles the more, the higher the pressure difference on the water switch 7. At the same time, the bypass channel is created by the valve piston 22 15 released to the extent that the line 11 is throttled by the valve piston 23 will. So only a partial current flows through the radiator 12, while the Remaining water passes through the bypass channel 15 directly to the tap 14. The heat exchanger 12, which is heated with reduced power, is passed through the partial flow cooled sufficiently and not too much, so that condensation forms is avoided. By an additional spring 24, which acts in the same way as the valve spring 18, but only comes into operation when the throttling of the gas begins by the control body 21, one can achieve a flatter control characteristic in the control range achieve.

In Fig. 2 is a mixer connected to the device according to Fig. 1 shown schematically. The hot water supply opening 25 is of a conical, acting as a water flow regulator control body 26 dominated, which is under the influence a spring 27 stands. The cold water inflow opening 28 to the mixer tap is controlled by a valve body 29, which is connected to a thermostat 31 located in the mixing chamber 30 connected is. By means of a camshaft 32 to be actuated from the outside, at the same time the tension of the spring 27 and the position of the thermostatic valve 29/31 are set will. This setting can be made according to a temperature scale (not shown) will.

The water volume regulator 26, 27 holds independently of pressure fluctuations a constant amount of water determined by the tension of the spring 27 in the supply network. The larger the set amount of water, the stronger it becomes, as described above, throttled the gas supply through the control body 21 and thus the heating power of the Device degraded. As a result, the temperature of the water increases as it increases the amount of water decreases progressively, you can use the water flow regulator 26, 27 in spite of relatively low outlet temperatures due to its limited setting range to adjust. By the inflow of cold water to the mixer tap, the amount of which is reduced by the Thermostatic valve 29/31 is determined, the outlet temperature can be further reduced will. So it is possible even in summer when the temperature of the cold water is proportionate is high to achieve low outlet temperatures with low flow rates.

Claims (7)

PATENT CLAIMS: 1. Gas-heated instantaneous water heater, its burner gas valve when a dynamic pressure difference occurs at the water switch from this is fully opened, characterized in that when the pressure difference increases and the resulting increase in the water switch stroke, a throttling the gas supply takes place. 2. Gas-heated water heater according to claim 1, characterized characterized in that the throttling of the gas supply by means of an additional, finite the throttle body connected to the burner gas valve. 3. Gas-heated instantaneous water heater according to claim 1 or 2, wherein the opening of the burner gas valve by the stroke of the water switch takes place against the action of a valve spring, marked, by an additional spring acting in the same direction as the valve spring (18) (24), which only comes into effect in the control range with an increased water switch stroke. 4. Gas-heated water heater according to claim 1, characterized in that the Throttling of the gas supply in the event of an increased pressure difference by switching off individual ones Parts of a burner consisting of several separately fed parts takes place. 5. Gas-heated instantaneous water heater according to one of claims 1 to 4, characterized in that that from the water switch (7) a bypass channel lying in the waterway parallel to the radiator (15) is controlled by a valve (22, 23) in such a way that when the burner output is reduced the amount of water flowing through the radiator (12) is reduced and some of the water is passed through the bypass channel (15). 6. Gas-heated instantaneous water heater according to one of claims 1 to 5, characterized in that in the hot water outlet a spring-loaded control body (26, 27) is arranged as a flow regulator, whose Spring loading from the outside, preferably according to a temperature scale, is adjustable. 7. Gas-heated water heater according to claim 6, characterized in that the Control body (26, 27) regulates the flow of hot water to a mixer tap, the flow of cold water is regulated by a thermostatically controlled valve (29, 30), and that the setting values the control body and the thermostatically controlled valve can be changed together are. Publications considered: German Patent No. 647 449.