DE2930872A1 - Programme controlled feed valve for oil or gas heater - has corresponding thermostat and timer switch contacts connected in parallel - Google Patents

Abstract

The heater has a control valve inserted in the fuel feed line, which is opened and closed via a thermostat. The valve is also directly or indirectly coupled to a control unit with a timer programme switch, so as to cut-off the fuel feed for specific intervals at determined points in time. A setting element allows the ratio of the duration of these intervals to the lengths of time between them to be adjusted. Pref. the programme switch has two rotating arms set at an angle to one another, with their rates of rotation and relative angular position being variable. One switch arm controls the closing of the feed valve and the other controls the opening of the feed valve. The thermostat contact controlling valve closure is coupled in parallel the first switch arm contact on the two contacts controlling valve opening are similarly coupled in parallel.

Description

Equipment for heating systems

The invention relates to such devices for heating systems that vol The preamble of claim 1 is included.

Prior art It is known that heating systems sit thermostats to regulate. Complex control systems have several thermostats, a first one in the room, the room temperature of which is to be kept essentially constant, a second, which is the temperature of the hot water leaving the boiler the so-called flow temperature, and a third one that measures the outside temperature recorded.

With a well-designed control system, the room thermostat switches the heating system when the desired room temperature is reached in order to overheat of the room to avoid. The flow thermostat, on the other hand, switches the heating system on again when the flow temperature falls below a suitable value, the is chosen so that the room temperature does not drop so far that the whole Room noticeably cools down and causes the room thermostat to respond.

Because with the drop in room temperature by a fraction of a degree of warmth This is accompanied by a more easily edible, since a clearer drop in the flow temperature.

As a rule, every flow thermostat is also a switch-off temperature assigned so that the radiators are not unnecessarily heated when a room is heated up will. Is the ratio of the switch-off temperatures of the room thermostat and the Incorrectly selected flow thermostat can result in the undesired Room temperature is not reached because the wara water does not even have the temperature which would make it possible for the room to respond to the room thermostat to supply the necessary heat.

Such conditions often occur when the outside temperature has fallen sharply the flow temperature set in the exit time was not readjusted Own modern control systems therefore automatic tracking of the Flow temperature when the outside temperature drops to ensure that in the room thermostat determines the room temperature in each case.

Invention Such control systems work to full satisfaction the user.

By choosing a lower room temperature you can in such systems quite realize the intention to save fuel. However, it is a quantitative one Relationship between the temperature reduction and fuel savings or between an increase in the room temperature and the additional costs of higher energy consumption not to be recognized in the known systems. To remedy this deficiency, the Invention.

The characterization of claim 1 cites the features that go together itt the generic term make up the invention.

Drawing and Explanation In the drawing is an exemplary embodiment the invention shown according to the principle. FIG. 1 shows a functional diagram, Figure 2 shows a suitable combination of thermostat switch contacts in conjunction with the switching contacts of the device according to the invention.

The heating system 1, the control of which the device according to the invention serves, consists of a lower burner 2 and a hot water boiler arranged above it 3. The water @@@@ cooled down in the only partially shown heating system 4 from the return pipe 5 into the hot water boiler 3 and is here when the burner runs, heated up The hot water exits from boiler 3 and is returned to the heating system 4 by the pump 7 installed in the flow pipe 6. "ic Tc-, ratui Utb zurückgepi.iivipten hot water is a flow thermostat 8 measured. In the room in which the heating system is supposed to heat, the temperature monitored by the room thermostat 9. The fuel supply to burner 2 via the line 10 is released or blocked by a switching valve 11. since it at Heating systems as a rule it is not usual to adjust the fuel supply to throttle the energy demand by reducing the pressure. The switching valve is with an electrically controllable actuator 12 equipped. This actuator is in connection with a central control system 14 via a connecting line 13, which the two mentioned thermostats 8 and 9 transmit their status reports.

The control circuit according to the invention is connected to the control system 14 with a Time-controlled breaker 15 connected. This breaker 15 exists essentially consisting of two switching arms 16, 17, which are a given one with the other Include angle 4 and shared by a rotor, not shown, on a Circular path are guided. The two switching arms overflow one after the other Switch contacts.

The first contact closure of the switching arm 16 15st via a reference the circuit explained in more detail in FIG. 2, the closing of the switching valve 11 from. At the second contact closure by the switching arm 17, the switching valve is opened again. This game repeats itself periodically. The rotation time of the motor is freely selectable. The selected angular position α of the switching arm is the ratio of Closing time of the switching valve determined to its opening time, so dal overall the valve is closed for predetermined periods of time at predetermined time intervals held and the fuel supply can be interrupted.

Since the fuel supply is during the opening time of the switching valve is constant per unit of time, the product of the amount of fuel corresponds to per Timing and opening time for the fuel consumed. Hence the angle This is a direct measure of the maximum fuel consumption per time period.

The speed of the motor has no influence on this. At high speed the angle * is swept over in short periods of time, at a lower speed in longer periods of time. In both cases, the sum of these periods is within 24 Hours or any other period of time.

If at any time within the determined by this breaker opening time of the room thermostat or the flow thermostat switches off the switching valve, then the current energy demand required for space heating is below that preset maximum limit. On the other hand, it is at the preselected maximum limit the fuel consumption is quite possible that the temperature is the necessary measure not reached. Then you can push the limit to higher consumption through appropriate Shift change of angle s.

Rierdurch also receives a statement about the additional consumption and thus about the cost of the temperature increase. This link between the Angle alpha and the cost per day or any other unit of time one expediently calculate and display the at by a computer 18 the breaker is connected. The well-known external thermostat 19, which the Ab switches temperature of the flow thermostat, can lead to a corresponding Adjustment of the angle * can be used, since bit of decreasing outside temperature the fuel requirement increases.

If the setting values are changed, the consumption will be higher easily exceeded the point at which the room or flow thermostat again the shutdown of the heating takes over. If one wants to recognize this point, one must in each case the switch position in all three control units 8, 9, 15 be displayed so that the effective control unit or the transition of the effectiveness from one to the other control unit becomes recognizable during readjustment. This assumes that the shutdown by all three control units is equal, while with of activation the breaker 15 has priority over switching on received by the other two control units. The required switch configuration is explained in more detail based on rlgur 2 in the following.

In Figure 2, the switching contacts of the three control units 8, 9, 15 shown. Here is an explanation for the contacts of the rough and the forerun thermostats One changeover switch each U8, U9 re-selects, while as contacts of the breaker 15 its switching arms 16, 17 are used.

The normally closed contacts A8, A9, changeover switches U8 and U9 and the switching arm 16 are connected in parallel. In series with each of these contacts there is an indicator lamp L8, L9, L16. This parallel connection is in series.

with a control winding 20 of the actuator 12, which closes of the switching valve causes. When the contacts are closed, the control winding 20 connected to the power source.

When the switching arm 16 causes the switching valve to close, that is when the first one closes, only the L16 assigned loupe burns.

The other two display lobes then remain vibrating a time cycle permanently dark, as neither the room temperature nor the flow temperature are the ones set Can reach shutdown values due to a lack of heat supply, and thus these shutdown contacts A8 and A9 remain open. If, however, one of the two thermostat contacts U8 or closes U9 earlier, then the corresponding display L8, L9 lights up first. overflows then the switch arm 16 also has its contact, then it also lights up assigned lamp L16 on.

From the display of the lamps it can thus be seen whether the temperature from room thermostats, from the flow thermostat or by limiting the fuel supply is bestiuot The working contacts of changeover switches U8 and U9 are also connected in parallel, the switching arm 17 is, however, with this parallel connection in Line. A control winding 21 in the actuator 12 is connected to the switching arm 17, which causes the switching valve to open. The switching valve is controlled by the contact arrangement only opened when the switching arm 17 closes and one of the two at the same time Make contacts E8, E9 the changeover switch U8 or U9 is closed.

This arrangement of the various contacts of the thermostats du breaker is ensured that the angle e is actually the decisive one May represents the fuel consumption and as the only measured value in the calculator comes in. The rest of the data for the cost of fuel consumption, namely size the amount of fuel flowing through the line 10 per unit of time and the respective The price of a unit of quantities must be known to the computer in a known manner. such as fl. a numeric keypad can be entered. The linkage of the measured value with these two input values takes place in also known circuits such as well-known facilities are also available for displaying the final result.

Claims (5)

Patent claims device for a heating system operated with gas or oil with a switching valve in the fuel supply line, its opening and closing can be controlled by thermostats, characterized by one with the switching valve directly or indirectly connected control system with a time-controlled one Interrupter that for predetermined periods of time at predetermined time intervals the Fuel supply interrupted. 2. Device according to claim 1, characterized by control elements for setting the ratio of the duration of the time periods to the length of the time intervals. 3. Device according to claim 2, characterized by an interrupter with two at an angle to each other, rotating switching arms (16, 17), their Speed and angle setting are changeable and the first of which is closing, the second causes the switching valve to open. 4. Device according to claim 3, characterized in that the Closing the switching valve causing shut-off contacts of the thermostats and the Interrupter are connected in parallel while the opening of the switching valve causing switch-on contacts of the thermostats are parallel and with the corresponding Contact of the breaker are connected in series. 5. Device according to claim 4, characterized in that with each Switch-off contact an indicator lamp is connected in series.