CZ2005557A3 - Thermostatic regulator of combustion air amount, particularly for solid fuel-burning heating systems - Google Patents

Abstract

The present invention relates to a thermostatic regulator of combustion air amount, comprising a heat-conducting casing (1) being detachably coupled with a regulator body (2). A control shank (4), being permanently pressed against a thermostatic element (3) contained within the casing, is mounted slidably in the casing (1) and the regulator body (2) interior. A radial arm (5), serving for attachment of a lever (6) with a control chain, reaches into the regulator body (2). Swinging motion of said arm (5) is derived from sliding motion of the control shank (4). In the thermostatic element (3) or between the thermostatic element (3) and the casing (1), there is arranged an electric heating body (7) adapted to connection to a temperature control device of the heating body (7) in dependence on a required temperature of the heating system discharge water or air. Pressure of the control shank (4) against the thermostatic element (3) is mediated by a compression spring (8) arranged within the casing (1) and acting against pressure of a piston (9) bearing by its finger (14) against a helix of a regulator control knob (10) attached to the control shank (4). The electric heating body (7) is connected to a control device (11) being selected from the group consisting of a room thermostat, manually operated voltage source for continuous adjustment of a boiler discharge water or air temperature drop. The control device (11) can be also represented by an electronic controller with continuous or step control of output voltage.

Description

Technical field

The present invention relates to an arrangement of a thermostatic regulator of the amount of combustion air, in particular for solid fuel heating devices.

BACKGROUND OF THE INVENTION

Known thermostatic combustion air volume regulators for solid fuel heaters use a thermostatic thermowell, adjusting the outlet water temperature of the heating device by means of a knob directly on the regulator. They differ in construction details, usually in the temperature setting system. The disadvantage of their use is the necessity to adjust the outlet water temperature of the heating device directly on the heating device, which is usually located outside the heated space, usually at the place of storage of solid fuel, ie coal or wood. This means reduced heating comfort for the user.

SUMMARY OF THE INVENTION

Disadvantages of the present state are largely eliminated by the new arrangement of the thermostatic regulator of the amount of combustion air, in particular for solid fuel heating devices comprising a thermally conductive casing to which the regulator body is detachably connected. A thermostatic member is disposed within the housing to which the actuating stem is permanently pressed, displaceably disposed within the housing and the interior of the regulator body, where a radial arm extends into the regulator body for fastening the lever with the control chain; control shaft. SUMMARY OF THE INVENTION An electric heater adapted to be connected to a heater temperature control device is provided in the thermostatic element or between the thermostatic element and the housing, depending on the desired outlet water or air temperature of the heater. In order to press the control shaft against the thermostatic element, the shaft in the housing can be mounted on a compression spring against the pressure of the piston, which rests with its

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thumb to the helix of the regulator control knob attached to the control shaft.

The electric heater may be connected to a control device selected from the group consisting of a room thermostat, a manually operated voltage source for continuously adjusting the amount of the outlet water or boiler air temperature drop when the room thermostat is turned off, and a manually operated voltage source for manually controlling the outlet temperature water or air from the boiler. Alternatively, the electric heater can be connected to an electronic controller with continuous or step output voltage control.

The advantage is to increase the comfort of the user of the solid fuel heating system, which can control the amount of combustion air and thus the temperature of the outlet water or the air of the heating device directly from the heated space. It is also essential that the power of the heating device can be controlled directly by the thermostatic controller of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

For further explanation, embodiments of the invention are illustrated in the accompanying drawings and described in detail below. FIG. 1 is a partial cross-sectional view of the construction of a thermostatic combustion air quantity regulator, the housing of which is a thermostatic member to which a control shaft is pressed, displaceably disposed within the housing and the interior space of the regulator body. A radial arm extends into the regulator body for fastening the lever with the control chain, where the rocking movement of this arm is derived from the sliding movement of the control shaft.

Between the thermostatic element and the housing is provided an electric heater adapted to be connected to a heater temperature control device depending on the desired outlet water or air temperature of the heater. Figures 2a, 2b and 2c show schematically several examples of different heater temperature control devices depending on the desired outlet water or air temperature of the heater.

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DETAILED DESCRIPTION OF THE INVENTION

The thermostatic regulator of the combustion air amount for solid fuel heating devices, for example boilers, fireplace inserts, possibly stoves, comprises a thermally conductive housing 1 of brass, copper, plastic and the like, which forms a regulator pit into which the regulator body 2 is screwed. made of brass or plastic.

In the housing 1 is inserted a thermostatic member 3, which is under permanent pressure of the compression spring 8, the opposite end of which rests over the plate 12 on the projections 13 in the regulator body 2. The spring 8 presses the actuating shaft 4 to the thermostatic element 3 via the spacer and teflon washer, to which the plastic actuating or actuating device is screwed at its opposite end. On the inner side of the knob 10 facing the open end of the regulator body 2, a helix is formed, to which a thumb 14 of the shaped piston 9 is loosely received in the regulator body 2. On the opposite side of the piston 9, there are support projections 15 for contact with the fork of the radial arm 5, swinging arranged in the grips 16 of the regulator body 2. A lever 6 extends through the fork body of the radial arm 5, at the free end of which a control chain is hinged, which is connected to a flap of the supply air to the heating device. The swinging movement of this arm 5 is derived from the sliding movement of the control shaft 4. Between the thermostatic member 3 and the housing 1, or directly in the thermostatic member 3, an electric heater 7 is arranged adapted to be connected to the heater temperature control device 7 depending the outlet water or air temperature of the heating device. The heater 7 may be positioned between the front of the thermostatic element 3 and the bottom of the well or the thermowell. of the housing 1. (it can be glued to the face) or it can be adjacent to the cylindrical peripheral surface of the thermostatic element or it can be built directly in the thermostatic element

The sump, respectively. the housing 1 of the regulator is screwed into the body of the heating device, namely in the area of the hot water outlet from the boiler or fireplace insert or the hot air outlet from the stove. The temperature of the water is influenced by the thermostatic member 3 which, depending on it, extends the control shaft 4. The sliding movement of this shaft 4 is transmitted via the adjusting knob 10 and the piston 9 to the fork of the radial arm 5 and further to the lever 6 with a chain that opens or closes the combustion air to the heating device. By rotating the setting knob TO, the relative position of the piston 9 and the stem 4 can be preset to influence the temperature to which the outlet water temperature of the heating device is regulated. By placing the electric heater 7 on the thermostat 3, it is possible to raise the temperature of the thermostatic member 3 over the temperature of the leaving water of the heating device and thereby change the temperature setting to which the controller maintains the temperature of the leaving water of the heating device. In doing so, the mechanical temperature setting by the knob 10 is retained and the controller can function as a conventional current controller, which is important, for example, in the event of a power failure, electrical equipment failure or thermostat failure. Applying electrical voltage to the regulator only decreases the mechanically adjusted temperature by a value proportional to the applied voltage or voltage. heating power of electric heating element 7.

In FIG. 2a, the terminals of the electric heater 7 of the controller are connected to a control device 11 formed by an electronic controller with continuous or stepwise control of the output voltage. These electronic controllers are commercially available, are usually used with an output of 0 to 10 volts, and are either indoor (that is to maintain the set room temperature) or weather-compensated (taking into account the outdoor temperature and calculating and controlling the water temperature to the heating system). and can still correct this temperature with respect to room temperature). Their continuous or step output signal directly controls the outlet temperature and thus the output of the heating equipment (boilers, fireplace inserts, stoves) for solid fuels.

In Fig. 2b the outlets of the electric heater 7 of the regulator are connected to a control device 11 consisting of a manually operated voltage source for continuously adjusting the amount of temperature drop of the outlet water or boiler air when the room thermostat is switched off or air from the boiler. The user has a continuous voltage setting to the controller, a controlled voltage source or a divider by means of an output voltage setting potentiometer, which itself controls the temperature of the outlet water or air of the heating device. It is very simple and fluent temperature control, but it is not related to the room temperature of the heated space. For users, this is similar to a conventional conventional controller, where it sets the temperature directly on the controller, but in this case, the controller can be placed directly in the room and does not have to go to the boiler basement to change the temperature setting.

In Fig. 2c the outlets of the electric heater 7 of the controller are connected to a control device 11 formed by a standard room thermostat, i.e.

X solutions with compromise cost and convenience between the two above. The voltage here is routed from a voltage source (for example, an adjustable voltage source) through a room thermostat to the controller. If the room temperature is lower than that set on the room thermostat, its contacts are open and the boiler is heating to the temperature set on the mechanical setting knob 10 directly on the controller. When the set room temperature is reached, the room thermostat closes the contact and the controller is energized (to the electric heater 7). which will lower the set temperature of the outlet water or air of the heating device. This will reduce the output of the heating device and the temperature of the radiator water, the room temperature of the heated space will be reduced, then the room thermostat will open the contact and the process will be repeated. In this case, the user or service technician selects a suitable source voltage when setting up the system, which determines the temperature drop (the voltage source can be supplied already set at the factory) and subsequently the system only works according to the room thermostat setting. For example, the voltage of the source is set to 7 volts, causing a drop from the set 70 ° C on the combustion air volume regulator to 55 ° C after the voltage is applied to the regulator (into the electric heater 7).

Solid fuel heaters cannot be turned off completely, as is the case with a gas or electric boiler. The solid fuel boiler has mechanically set a certain minimum output, which it will maintain regardless of the combustion air volume regulator (usually there is a screw that keeps the doors at least open, which are chain operated by the combustion air volume regulator or draft). From the point of view of boiler efficiency it is better if the temperature changes only a little, so the voltage is set on site according to the particular heating system. In this case, all the controls work the other way than usual, as for cooling. By applying voltage to the electric heater 7, the boiler output and temperature are reduced. Some boilers work in conjunction with a thermostatic or actuator controlled valve that maintains a constant return temperature to the boiler or an outlet temperature from the boiler to prevent condensation in the boiler at low temperatures. Likewise, the temperature to the heating system can be controlled by a control that controls the mixing valve and controls the temperature to the heating system, for example for underfloor heating. In all these cases, an electrostatically controlled thermostatic controller according to the present invention can be advantageously used. It can be controlled directly by the used regulation or it can work, for example, with a thermostatic three-way valve that controls the return water to the boiler.

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This keeps it at 60 ° C, for example, at full boiler output, the temperature at the boiler outlet is for example 80 ° C (depending on the output of the circulation pump). If the regulator lowers the temperature to 70 ° C, the boiler output will be halved. If the temperature on the controller is lowered, for example, to 60 ° C, the boiler outlet temperature will be maintained according to the set mechanical minimum; if it is 40% of maximum output, the outlet temperature will be maintained at 68 ° C. Thus, the boiler will still operate at a return temperature of 60 ° C, which is important to prevent the desired condensation. Its outlet temperature will be regulated between 68 / C and T80 ° C and thus its output in the range from 40 to

100%. This is a substantial change since it is clear that the boiler output is controlled directly. Without the thermostatic three-way valve, temperatures can be set in the same range (68Xf to 80 ° C), but the boiler output does not need to change in the same range. As the return temperature is not kept constant, the return water drops back to the boiler as the outlet temperature from the boiler decreases, thus the temperature difference on the boiler will be higher than when using the return thermostatic valve, so the boiler will operate at higher output. Combined with keeping the return flow constant, the output temperature changes precisely as the outlet temperature changes.

Claims (5)

PATENT CLAIMS Thermostatic regulator of the amount of combustion air, in particular for solid fuel heating devices, comprising a thermally conductive casing (1) with which the regulator body (2) is detachably connected, in the casing (1) a thermostatic element (3) to which the control shaft (4) is pushed permanently in the housing (1) and the interior of the regulator body (2), wherein a radial arm (5) extends into the regulator body (2) for fastening the lever (6) with the control chain; the rocking movement of this arm (5) is derived from a sliding movement of the control shaft (4), characterized in that an electric heating element (7) is arranged between the thermostatic element (3) and the housing (1), adapted to be connected to a temperature control device the heating element (7) depending on the desired outlet water or air temperature of the heating device. Thermostatic regulator of the amount of combustion air, in particular for solid fuel heating devices, comprising a thermally conductive casing (1) with which the regulator body (2) is detachably connected, in the casing (1) a thermostatic element (3) to which the control shaft (4) is pushed permanently in the housing (1) and the interior of the regulator body (2), wherein a radial arm (5) extends into the regulator body (2) for fastening the lever (6) with the control chain; the swinging movement of this arm (5) is derived from the sliding movement of the control shaft (4), characterized in that an electric heating element (7) is arranged in the thermostatic element (3), adapted to be connected to the heating element temperature control device (7). depending on the desired leaving water or heating air temperature. Thermostatic regulator according to claim 1 or 2, characterized in that, in order to press the control shaft (4) against the thermostatic element (3), the shaft (4) is mounted in the housing (1) on a compression spring (8) against the piston pressure (8). 9), which bears with its thumb (14) to the helix of the control knob (10) of the regulator fixed to the control shaft (4). Thermostatic controller according to one of Claims 1 to 3, characterized in that the electric heating element (7) is connected to a control device (11) selected from X »>>> >>> -> groups, including a room thermostat, a manually operated voltage source for continuously adjusting the amount of the outlet water or boiler air temperature drop when the room thermostat is turned off, and a manually operated voltage source for manually controlling the boiler water or air outlet temperature. Thermostatic controller according to one of Claims 1 to 3, characterized in that the electric heating element (7) is connected to a control device (11) consisting of an electronic regulator with continuous or step control of the output voltage.