IES20160085A2 - Electric convector - Google Patents

Abstract

The invention relates to electrical technology, and specifically to electric convective heaters of domestic and office accommodation. The claimed convector consists of a boxlike body frame with a front panel 1, air-inflow holes 2 located at the bottom and air-outflow holes 3 located in the upper part of the body frame, a back panel 4, a box 5 in which a control block with a cover 6 is placed, and a heating element 7 made from a tubular electric heater. The control block is electrically connected to a current supply 8, made in the form of a feed cable, and is equipped with a button 10 of a two-position mechanical switch 10 (on/off). The current supply 8 is provided with a clamp 11 in the upper part and a temperature transducer 12 which is electrically connected to the control block and fastened to the current supply 8 by means of a bracket 9. The box 5 of the control block is equipped with a display 13, which is placed on the cover 6. The control block is equipped with a protector thermostat 14, fastened to the cover 6 of the box 5 on a platform 15. The box 5 of the control block is connected to the body frame of the convector by means of a mounting element 16. The electrical connection of the temperature transducer 12 to an electric circuit board 19 of the control block is realized by a current lead 18. The technical result is an increase in the accuracy of the temperature regulation. <Figure 1>

Description

ELECTRIC CONVECTOR The invention relates to electrical technology, and specifically to electric convective heaters of domestic and office accommodation.

Electric convectors have found wide application as a consequence of the fact that they do not deplete the air of oxygen and are safe to use, partly because the low temperature of the heating element prevents too-strong heating even of a convector switched on at the highest power, for which the maximum temperature of the surface of the body frame is in the range from 60 to 90°C. In addition, electric convective heaters of simplicity to mount and to use, since during their installation they do not require disruption of existing utility services.

At the present time models of electric convective heaters are being produced in the world in which a temperature transducer is installed in the lower part of the body frame on the right or left side below the heating element or in the lower part of the body frame alongside the air-inlet nozzle or in the upper part of the body frame in the control block of the convectors, on the right or left side.

In particular, a heater is known that has a body frame inside which is located a heating block inserted into a casing and isolated from the body frame, an air-supply block, a transformer from the constant voltage of an on-board electric-transport circuit to an alternating voltage feeding an asynchronous electric motor, and series-connected thermotransducers of the system of protection. The heating block is made in the form of a series of electrically connected heating elements fastened across insulators on brackets. The air-supply block is made in the form of an asynchronous electric motor connected with an impeller and shaper of the air flow. Thermotransducers are installed inside the casing of the heating block on the side of the air-supply block. In one of the walls of the body frame a high and a low feed voltage are fed in (patent RU No. 2343364, 2009).

Also known is a convective electric heater containing a body frame with vertically oriented front and back panels, air-inflow grills located in the lower part of the body frame and airoutflow grills located in the upper part of the body frame, a heating element located so as to permit interaction with the air flow in the lower part of the body frame above the airinflow grills, and an air ionizer located above the heating element, and also a control device, a protector thermostat, a thermal cutout and a temperature transducer, which is placed in the control device (patent RU No. 93943, 2010).

Also known is an electrical device for heating accommodation in the form of an electric calorifier that contains a body frame with air-inflow and air-outflow holes positioned at opposite ends of the body frame, a ventilator, and electric heating elements placed inside the body frame and electrically connected to a control block installed on the outer side of the body frame. The electric calorifier contains a humidity- and temperature-control device, installed on the body frame and electrically connected to the control block of the electric calorifier (patent RU No. 124773, 2013).

None of the convective electric heaters listed above makes it possible for the temperature transducer to determine accurately the temperature in the accommodation, since the temperature transducer in all the variants of its location listed above is situated next to the heating element, and also within the convective flow, including in the control block.

At this moment in time all the temperature transducers, from all manufacturers, in electric convector heaters of the domestic type throughout the world have an error of 5 to 10°C. In other words, they show a temperature of 20°C when the actual temperature in the accommodation is 10-15°C. To hide this defect manufacturers measure the average error of the temperature transducer and then the processor on the electronic circuit board of the appliance automatically adds the given average error when the temperature in the accommodation is calculated. In turn, this leads to the result that the electric convector heater is shoddily fulfilling its function.

The closest to the proposed electric convector is a convective electric heater containing a convection chamber formed by a face panel and a back body frame having a boxlike structure and forming side walls; in the lower part is located an air-inflow grill, and in the upper part are located outflow holes for the passage of air and functional elements that are fixed inside the convection chamber by mounting elements; the functional elements placed in the lower part of the convection chamber are a heating element with a current supply, and a control block with a switch-on button; the mounting elements are made in the form of a left and a right plastic mounting body frame, each of which contains a housing for fixing the functional elements and a catch for interlocking with the side walls of the convection chamber. It contains as a functional element a thermotransducer installed in a hole ofthe mounting body frame (patent RU 141837, 2014).

The known convector ensures the possibility of placing the thermotransducer at the point of air inflow, i.e. of increasing the accuracy of measurements of the air temperature in the accommodation and also of protecting it from undesirable overheating as a result of a temperature shock. At the same time, depending on the positioning (for example, from the point of view of the location of windows, cold walls, air currents and other features), the heater maintains a temperature in the accommodation that differs by 2-4°C, in either direction, from that specified by the user. In addition, if the location has high ceilings and a narrow space between walls, an electric convective heater with the temperature transducer located at the bottom will not heat the air in the given location to the prescribed temperature, since a thermotransducer down below will switch off the heating element earlier than it should.

The object of the invention is to increase the effectiveness of an electric convector by increasing the accuracy ofthe temperature regulation.

The technical result is an increase in the accuracy of the temperature regulation.

The problem posed is solved by the fact that the claimed electric convector contains a body frame with air-inflow holes located at the bottom and air-outflow holes located in the upper part of the body frame, a heating element, a control block and a current supply, wherein the control block is an electric circuit board placed in a box, and a temperature transducer electrically connected to the control block, characterized in that the temperature transducer is installed on the current supply.

The body frame can be equipped additionally with mounting elements for mounting on a wall, which are located on the back wall of the body frame.

It is preferable that the front panel of the body frame be made to be heat-transferring.

The box with the control block is made with a cover on which can be placed a display with control elements. The box with the control block is positioned in the upper part of the body frame of the electric convector.

The control block is equipped with a switch-on button and can be additionally equipped with a protector thermostat.

For the electric circuit board it is preferable to use a processor.

For the heating element tubular electric heaters are used.

The air-inflow and air-outflow holes are preferably realized in the form of a louvre board.

For the current supply a feed cable is used, connected at one end to the control block, the other end being equipped with a plug for plugging into an electrical-energy source.

For the temperature transducer use can be made, for example, but not limited thereto, of the temperature transducer of the brand Ballu BEC/EVE-1500 or the brand Electrolux ECH/AG2-1000EF, for example. The temperature transducer is equipped with a bracket for fastening to the current supply and for mechanical protection from damage. The bracket is made from polymer material, and preferably from polyethylene. The bracket can be made in the form of a capsule with perforations.

The positioning of the temperature transducer on the current supply makes it possible to determine the temperature in the accommodation with an error of not more than 3°C, since: 1. the temperature transducer is at a distance of more than 40-50 cm (depending on the model) from the body frame of the heating element; 2. the temperature transducer, being situated on the outside of the convector and not inside the body frame, is outside the active convection process, i.e. it measures the temperature in the accommodation and not the temperature of the heated air that is produced and emerges from the body frame of the convector on account of its aerodynamic properties.

This makes it possible for the temperature transducer, in all cases and in all types of accommodation, to display the temperature in the accommodation with maximum accuracy, and means that the electric convective heater with this positioning maintains exactly the temperature that was prescribed by the user.

The claimed electric convector is illustrated by examples of concrete implementation. In particular, example 1 shows an electric convector with a temperature transducer with a metallic terminal on the current supply and with a bracket for fixing the temperature transducer and providing same with mechanical protection from damage. Example 2 shows an electric convector with a temperature transducer without a metallic terminal, where a capsule in which the temperature transducer is placed is used as a bracket for fixing the temperature transducer to the current supply and for mechanical protection of the temperature transducer supply from damage.

Examples of concrete implementation are illustrated by the following figures: Fig. 1 depicts the general form of the claimed convector; Fig. 2 depicts the same, viewed from the front; Fig. 3 depicts the same, viewed from the side; Fig. 4 depicts the same, viewed from above; Fig. 5 shows the electric circuit of the claimed convector; Fig. 6 shows the box of the control block with current supply as in example 1; Fig. 7 shows the box of the control block with current supply as in example 2; Fig. 8 shows a 3D model of the current supply with temperature transducer as in example 1; Fig. 9 shows a 3D model of the current supply with temperature transducer as in example 2; Fig. 10 shows a 3D model of the claimed convector with temperature transducer as in example 2.

The claimed electric convector consists of a boxlike body frame with a front panel 1, airinflow holes 2 located at the bottom and air-outflow holes 3 located in the upper part of the body frame, a back panel 4, a box 5 in which a control block with a cover 6 is placed, and a heating element 7 made from a tubular electric heater. The control block is electrically connected to a current supply 8, made in the form of a feed cable, and is equipped with a button 10 of a two-position mechanical switch (on/off). The current supply 8 is provided with a clamp 11 in the upper part and a temperature transducer 12 which is electrically connected to the control block and fastened to the current supply 8 by means of a bracket 9 (example 1). The temperature transducer 12 is fastened to the current supply 8 by means of a capsule 17 (example 2). The box 5 of the control block is equipped with a display 13, which is placed on the cover 6. The control block is equipped with a protector thermostat 14, fastened to the cover 6 of the box 5 on a platform 15. The box 5 of the control block is connected to the body frame of the convector by means of a mounting element 16. The electrical connection of the temperature transducer 12 to an electric circuit board 19 ofthe control block is realized by a current lead 18.

The claimed electric convector works as follows. After the electric convector has been switched on by plugging the current lead 8 into a domestic electric circuit (the plug of the current lead is not shown) and the button 10 ofthe two-position mechanical switch (on/off) has been switched on, the temperature transducer 12, fastened to the current lead 8 by means of the bracket 9 or capsule 17, determines the temperature of the surroundings in the accommodation and sends a signal to the processor on the electric circuit board 19, and the temperature readings appear on the display 13. By means of the control elements on the cover 6 of the box 5 of the control block, the user prescribes the desired temperature in the accommodation, e.g. 25°C. After this, by means of a relay, the processor of the electric circuit board 19 supplies current to the heating element 7 and the air entering through the air-inflow holes 2 is heated. The heated air, passing out through the air-outflow holes 3, heats the air in the accommodation. Heat transfer is also effected through the heat-transferring front panel 1 of the body frame. Every period of time (varying from 10 seconds to 5 minutes, for different temperature transducers) the temperature transducer measures the temperature in the accommodation and transmits the data to the processor of the electric circuit board 19. The processor cross-checks the data with the temperature set up by the user. When the temperature of the surroundings reaches 25°C a signal from the temperature transducer 12 arrives at the processor of the electric circuit board 19 of the control block, which changes the magnitude of the electric current passing through the heating element 7 and switches it off. After this the temperature transducer 12 continues to measure and send data to the processor of the electric circuit board 19. If the temperature readings in the accommodation fall below the temperature readings prescribed by the user, the processor of the electric circuit board 19 sends a signal to switch on the heating element 7. The protector thermostat 14, which is connected up in parallel to the current supply 8 and set to a temperature critical for the given convector, operates continuously. Correspondingly, when the temperature inside the convection chamber of the convector begins to exceed the critical temperature, the protector thermostat 14 breaks the electric circuit, and then, after the temperature inside the body frame falls to an acceptable value, the protector thermostat 14 closes the electric circuit again (Fig. 5) and the convector resumes the usual regime of operation.

Thanks to the claimed construction the electric convector, in comparison with existing models, ensures more-accurate maintenance of the prescribed temperature in the accommodation being heated, i.e. makes it possible to maintain the prescribed temperature of the accommodation with maximum accuracy by excluding errors in the determination of the temperature readings associated with the passage of a convective air current across the temperature transducer. Use of the claimed electric-convector construction makes it possible to maintain constant climate control at precisely the temperature that was prescribed by the user.

Claims (5)

CLAIMS:

1. Electric convector containing a body frame with air-inflow holes located at the bottom and air-outflow holes located in the upper part of the body frame, a heating element, a control block and a current supply, wherein the control block is an electric circuit board placed in a box, and a temperature transducer electrically connected to the control block characterized in that the temperature transducer is installed on the current supply.

2. Electric convector according to Claim 1, characterized in that the temperature transducer is fixed on the current supply by a bracket.

3. Electric convector according to Claim 2, characterized in that the bracket is made in the form of a capsule, optionally characterized in that the bracket is made from polymer material, optionally characterized in that, for the heating element, tubular electric heaters are placed in the lower part of the body frame, and optionally characterized in that the box of the control block is positioned in the upper part of the body frame and equipped with a switch-on button.

4. Electric convector according to Claim 1, characterized in that the box of the control block contains a display.

5. Electric convector according to Claim 1, characterized in that the control block contains a protector thermostat.