Automatic fuel flow cut-off safety system with position feedback and independent of the mains, which prevents backburning in the pellet hopper in pellet stoves.

Abstract

This invention relates to a safety system (17) in manual and automatic pellet stoves (12) that prevents the heat and flame in the combustion zone from traveling through the pellet flow line (11) to the pellet hopper (1) and igniting the pellets (backfire). The system comprises a thermostat (8) that closes when the temperature threshold (preferably 100 °C) is exceeded, an on-off system (2) that closes the flow line with horizontal movement, a geared motor (5) that drives this through drive parts (3, 4), first (6) and second (7) position switches that detect the open and closed positions, and an electronic board (10) containing a rechargeable battery pack (18) that provides power independent of the mains. The thermostat (8) and position switches (6, 7) are in the motor's power supply circuit; when the threshold is exceeded, the motor (5) closes the line, and in the closed position, the second switch (7) cuts off the circuit. Since the thermostat remains closed until the line cools down, even if the user opens the flow lever (9) manually, the first switch (6) will reset the circuit and the line will be closed again.

Description

TARIFF A device that prevents backburning into the pellet hopper in pellet stoves. FEEDBACK-BASED AND GRID-INDEPENDENT AUTOMATIC FUEL FLOW CUT-OFF. SECURITY SYSTEM TECHNICAL FIELD

[0001] This invention relates to pellet stoves powered by biomass-based pellet fuels. The invention concerns pellets. This applies to manual (non-electric) pellet stoves where the pellets flow solely by gravity, as well as to other types of pellet stoves. It is also applicable to automatic (electrically powered) pellet stoves where the pellets are conveyed by a screw conveyor / feeder.

[0002] More specifically, the invention is a system that continuously monitors the temperature on the pellet flow line, and this temperature If the temperature exceeds a predetermined threshold (preferably 100 °C), the flow line will be horizontal. a physically closing system that moves in a certain direction, the opening and closing of the said opening- by continuously monitoring the position of the shutdown system with feedback via position switches It also protects against manual attempts to open the closed position during the danger period and is completely network-free. with a safety system that operates independently of electricity, powered by a rechargeable battery pack. It is related. STATE OF THE ART

[0003] Pellet stoves are heating systems that use biomass-based compressed wood pellets as fuel. These are the devices. In commonly known automatic (electric) pellet stoves, pellets are taken from a storage area and... The gas is transported to the combustion chamber via a screw / auger mechanism and an electric motor; combustion occurs in a It is fan-assisted and the system is controlled by an electronic circuit board. These types of stoves are mains-powered. It is dependent on electricity; it cannot operate during power outages and in places without a grid (rural areas, Camping (off-grid use) is not preferred.

[0004] In addition, manual pellet stoves that do not require electricity are also known. This type In stoves, pellets are held in a reservoir at the top and move along a flow line by gravity alone. The fluid flows into the combustion chamber below; combustion takes place in the chamber. These stoves are independent of electricity, Due to their quiet operation and simple design, they are particularly suitable for camping, gardens, and off-grid use. It is valuable.

[0005] Both types of stoves have a common safety vulnerability: combustion with the pellet hopper. The area is connected by a fuel flow line through which the pellets pass, and this line is used during operation. It is clear. Heat transfer and flame propagation (backfire) occur through this line while the stove is operating. This can happen. If heat / flame travels upwards along the flow path, the water waiting in the tank... The pellets can reach their ignition temperature and ignite; this can lead to uncontrolled combustion, equipment damage, and This poses a serious fire risk.

[0006] In the known state of the art, manual stoves generally only offer passive protection against this risk. Measures are being used to ensure that the flow line geometry makes flame propagation more difficult. its design, the use of heat-resistant materials, and the fact that the tank has a lid that can be closed manually. As it is. While these passive measures can delay backfire, actively detecting the event and controlling fuel flow... Because they cannot cut it off, it does not eliminate the risk; it depends on user intervention and the user event He might not be at the stove right away.

[0007] Some active safety devices are known in automatic pellet stoves; for example, the feed Thermostats can be used that measure the temperature in the tube and stop the screw conveyor motor. However, this is a known method. 1 35 40 The solutions have significant limitations: (i) They are constantly dependent on grid electricity; whereas electricity The risk of re-ignition is highest if the interruption occurs while the crucible is hot and the reservoir is full, and At this very moment, the stove's own electronic protections also become disabled. (ii) These solutions are only for fuel It stops the feed; it creates a physical barrier in the open flow channel between the pellet hopper and the combustion zone. It doesn't close properly, so since the channel remains open, heat and flames can continue to spread backward. (iii) In gravity-fed manual stoves, there is no feeder / motor to stop; the flow Because it is continuous and passive, the fuel flow must be interrupted by a physical device.

[0008] Another and overlooked shortcoming of known solutions is that these solutions are permissive (permissive) nature. After activating the safety function, these systems... They do not monitor the actual position of the fuel flow system. Therefore, the danger situation has not yet been eliminated. If the user manually opens the flow lever while it is not raised, the protection is completely deactivated and The system wouldn't even be aware of it. In practice, the user wouldn't know why the stove has stopped. Because the lever can be forced open, this creates a real safety hazard.

[0009] Consequently, in the state of the art as it is known; pellet stoves, whether manual or automatic for this purpose, it monitors the temperature in the flow path and closes the flow channel with a physical organ when the threshold is exceeded. by continuously monitoring the organ's position through feedback via position switches, thus detecting danger. It also protects against manual attempts to open the closed position during this time, and does all this independently of the network. There is no integrated safety system that operates using its own battery power. This The invention was developed to address this deficiency. THE PURPOSE OF THE INVENTION

[0010] The purpose of this invention is to reduce the heat in the combustion zone in both manual and automatic pellet stoves. the flame travels down the flow path to the pellet hopper and ignites the pellets in the hopper (return The goal is to provide a safety system that effectively prevents (combustibility).

[0011] Another purpose of the invention is to continuously monitor the flow line temperature, ensuring the temperature is at a predetermined level. When the threshold value (preferably 100 °C) is exceeded, the fuel flow is automatically switched off without requiring user intervention. The goal is to offer a system that cuts off the heat, thus providing protection even when the user is not at the stove.

[0012] Another purpose of the invention is to open and close the flow channel by moving it in the horizontal direction. by physically shutting down the system, not only stopping the feed but also closing the pellet hopper. The goal is also to physically interrupt the heat / flame path between the combustion zones with a barrier.

[0013] One of the main aims of the invention is to disable the safety function by the user. The aim is to ensure that it cannot be abandoned. For this purpose, the system determines the actual position of the on / off system. It constantly monitors with its switches; as long as the danger situation continues, the user can manually open the flow lever. This situation is detected via the position switch, and the flow line is closed again with the help of the motor.

[0014] Another aim of the invention is to create a rechargeable battery that is completely independent of the mains electricity. It operates using a battery pack (preferably two Li-Ion cells connected in series), even in environments without electricity. And in automatic heaters, it offers uninterrupted protection even in the event of a power outage.

[0015] Another purpose of the invention is to audibly alert the user when the system is first activated, To enable monitoring of battery status via the electronic board and to protect the user in case of low voltage. The purpose is to prevent the protection system from losing power by providing a warning. 2 35 EXPLANATION OF THE INVENTION

[0016] To achieve the above purposes, the invention is a backfire inhibitor for a pellet stove (12). safety system (17); pellet flow line (11) extending from pellet hopper (1) to combustion pot (14) A thermostat (8) that senses the temperature on the flow line (11) moves it horizontally. a pellet flow on / off system (2) that opens and closes this system, drive parts (3, 4) an electric motor with a gear that moves through (5), the on / off system (2) The first (6) and second (7) position switches, which detect their positions, receive information from these elements an electronic board (10) that drives the motor (5) and feeds the whole system independently from the mains It contains a rechargeable battery pack (18).

[0017] Thus, the opening and closing system (2) is activated when the temperature threshold value (11) is exceeded in the flow line. By closing, it physically cuts off the tank's (1) connection with the heat / flame coming from the combustion zone. Also The actual position of the on / off system (2) via the electronic card (10), position switches (6, 7). continues to monitor; even if the user manually opens the flow lever (9) until the line cools down, the motor (5) By restarting the flow line (11), it is closed again. DESCRIPTION OF THE FIGURES

[0018] The invention is described below with the aid of the attached figures and technical drawings. However, this invention The figures are not limited to these examples; they only illustrate specific applications. Figure 1: Placement of the safety system mechanism on the stove and enlarged detail. It is a technical drawing showing the appearance of; pellet hopper (1), horizontally operating pellet flow opening-closing system. (2), drive parts (3, 4), geared motor (5), first and second position switches (6, 7), thermostat (8), flow arm (9), electronic board (10) and pellet flow line (11) are shown in this way. Figure 2: View showing the operating status of the safety system (17) on a cross-section of the stove; On the left, the on / off switch (2) is in the open position (normal operation), on the right it is in the closed position (overheating). state). Figure 3: Side view of the stove, showing the position of the thermostat (8) on the flow line (11). The actuation of the geared motor (5) by moving the on / off system (2) through the drive parts (3, 4), position switches (6, 7), flow arm (9), electronic board (10), battery pack (18) and output terminal (27) shows the settlement. Figure 4: Principal diagram of the control circuit; battery pack (18), charging unit inside the electronic board (10). (20), voltage monitoring unit (21), level indicator LEDs (22) and audible warning element (24) are included. The power supply circuit, starting from the output terminal (27) of the card, connects to the thermostat (8) contact and the second (7) and The motor (5) is reached via the first (6) position switches; the motor drives the on / off system (2). and the position of the organ is mechanically fed back to the switches (6, 7). Explanation of Reference Numbers in Figures 1 Pellet hopper 2. Horizontal pellet flow on / off system (closing mechanism / slide) 3. Drive part of the pellet flow on / off system. 4. Drive part connected to the geared motor. 12 V DC 5 rpm geared motor 6. Pellet flow on / off system, 1st position switch. 7. Pellet flow on / off system, 2nd position switch. 3 35 40 8 100 °C thermostat 9. Pellet flow on / off system lever (manual control lever) Electronic circuit board (electronic control unit) 11 Pellet flow line 12 Pellet stoves (complete) 13 Stove body 14 Burning pots Grill 16 Ash bins 17 Security system (complete) 18 Battery pack (2S Li-Ion; preferably 2×18650) 19 Battery compartment board Charging unit (Type-C) 21 Battery voltage monitoring unit 22 Level indicator LEDs (25% / 50% / 75% / 100%) 23 Low voltage warning unit 24 Audible warning elements (buzzers) Threshold / calibration adjustment element (potentiometer) 26 Power switch 27 Connection sockets / connectors 28 Feeder / screw conveyor (only in automatic stove application) DETAILED DESCRIPTION OF THE INVENTION

[0019] The invention describes the backfire from the combustion chamber to the pellet hopper (1) for a pellet stove (12). It is a safety system that prevents (17). In the preferred application shown in the figures, the stove (12), It is a gravity-fed manual pellet stove; a body (13), a pellet oven in which the pellets are stored. a storage tank (1), a pellet flow line (11) extending down from this tank, and a pellet flow line located at the end of the flow line It includes a combustion pot (14), grate (15) and ash hopper (16). The pellets are without any feeder. It flows from the reservoir (1) through the flow line (11) to the crucible (14) solely by the effect of gravity. This invention This is not limited to this application, but can also be applied to automatic (electrically powered) pellet stoves. Fuel Flow On / Off System and Drive

[0020] A pellet flow opening-closing system on the pellet flow line (11) that opens and closes the cross-section of the line. (2) is located. The opening-closing system (2) will cut the section of the flow line (11). It is designed as a sliding / cover mechanism that moves horizontally. This horizontally movable... regulation; organ movement even under the weight of the pellets and the filling pressure within the flow line. This ensures that it can function properly, making it more difficult for the pellets to compress and block the organ when in a closed position. and is advantageous in that it forms a leak-proof section closure along the flow line (11).

[0021] Opening-closing system (2), a drive part (3) connected to it and the motor with this part. Driven by a geared electric motor (5) via a drive part (4) between them. In the preferred application, the motor (5) is powered by 12 V DC and has an output speed of approximately 5 rpm. It is a geared motor. The preference for a low-speed, geared motor provides high torque, making it ideal for pellet handling. 4 35 40 It ensures the completion of the closing action even in a full flow line and the gearbox Its resistance to being pushed back increases the stability of the closed position.

[0022] The system also allows the user to manually turn the pellet flow on and off during normal operation. It includes a flow arm (9). The arm (9) is mechanically connected to the opening-closing system (2); Thus, the organ is a dual-mode organ that can be moved both by hand (with the arm (9)) and by motor (5). It creates a regulation. In normal operation, the user controls the flow with the lever (9); in case of danger, the motor controls it. (5) activates and cuts off the flow regardless of the position of the arm. Location Feedback

[0023] One of the distinctive features of the invention is the constant actual position of the opening and closing system (2). It is monitored as follows. For this purpose, the first position of the opening-closing system (open) is controlled in the system. a first position switch (6) that detects the position (off position) and a second position switch that detects the position (off position). The second position switch (7) is located. These switches (6, 7) display the position of the organ on the electronic board. (10) reports.

[0024] This position feedback performs two functions. Firstly, it improves the movement of the motor (5). By ensuring the mechanism is stopped when the target location is reached, it avoids straining and unnecessary actions. This prevents current draw; this is taken into consideration that the system is powered by a battery pack (18) with limited capacity. It is also important when taken. Secondly, and more critical from the point of view of invention, after the organ (2) is closed then for any reason (especially as a result of the user manually opening the lever (9) to the open position) It allows for the immediate detection of its passage. Control Circuit

[0025] In the preferred application, the control function is electromechanical without requiring a separate processor. It has been realized as follows. The electronic board (10) receives the voltage from the battery pack (18) through an output terminal (27) It provides through the thermostat (8) contact and the first (6) and second (7) position switches, the motor (5) They are interconnected within the power supply circuit. This arrangement is shown in Figure 4.

[0026] The operation of the circuit is as follows: When the flow line (11) temperature is below the threshold value, the thermostat (8) ignition is open and motor (5) is de-energized. When the temperature exceeds the threshold value (preferably 100 °C) the thermostat (8) The contact closes and the supply circuit is completed, energizing the motor (5) in the closing direction; opening- The closing system (2) moves towards the closed position.

[0027] When the on / off system (2) reaches the closed position, the second position detects this position. Switch (7) cuts off the power supply circuit and motor (5) stops. Thus the organ is kept in the closed position. The motor does not draw current unnecessarily; this is because the system has a battery pack (18) with limited capacity. It is also important when considering what it is fed.

[0028] The locking function is activated at this point. The thermostat (8) contact is closed until the flow line (11) cools down. It remains closed until this time. During this time, the user manually opens the flow lever (9) and opens and closes it. If the system (2) is removed from the closed position, the first position switch (6) changes state and the supply It re-establishes its circuit; the motor (5) is energized again and immediately returns the organ (2) to the off position. This cycle repeats with each attempt to open it manually.

[0029] When the flow line (11) cools down, the thermostat (8) contact opens, and the supply circuit is permanently interrupted. and the lock condition ends; the user can return to normal operation with the flow lever (9). As can be seen The locking function is powered by the danger condition itself (thermostat contact being closed). and is not subject to the user's will. 35 40

[0030] The implementation of the said control logic by directly connecting the switches, separately It does not require a processor, software, or complex circuitry, draws very low standby current, and It is advantageous in that it is resistant to software errors. However, this form of implementation of the invention not limited to, the same lock logic on the electronic board (10) a microcontroller, comparator The circuit can also be implemented with a logic gate or relay arrangement; in this case, the thermostat (8) and position Switches (6, 7) are connected as inputs to the card and motor (5) is driven by an output stage on the card. Temperature Sensing and Control

[0031] As a temperature sensing element, it will be placed on or in thermal contact with the pellet flow line (11). A thermostat (8) is used, placed near the thermostat in the manner described. In the preferred application, the thermostat in question The element is a limit thermostat with an opening temperature of approximately 100 °C; it opens at the specified limit temperature. When reached, it changes state and signals to the electronic board (10). Thermostat (8), flow line (11) detection of heat near the combustion zone before it reaches the reservoir (1) It is positioned in such a way as to provide this. In alternative applications, this element is an NTC thermistor or It could also be another heat sensing element, such as a thermocouple; in this case, the comparison function is performed by the electronic board. It is performed on (10) and the threshold value can be calibrated with an adjustment element (25).

[0032] Electronic board (10); housing, charging and monitoring the battery pack (18), and also the controller It forms the unit that feeds the circuit. The board (10) includes a power switch (26) and an output terminal (27); The motor (5), thermostat (8) and position switches (6, 7) are connected to the system via this terminal. Card also the audible warning element (24), the level indicator LEDs (22) and the low voltage warning unit (23) It carries. Lock Status and Protection Against Manual Opening

[0033] As the most distinctive feature of the invention, the system has a lock (protection) after the closing process. This situation continues until the thermostat (8) reports that the flow line (11) has cooled down. continues. The actual position of the opening-closing system (2) during the locking state, position switches (6, 7) It is continuously monitored through this method.

[0034] While the locking condition persists, the user attempts to manually open the flow lever (9) and opens- If the closing system (2) leaves the closed position, this movement is controlled by the first position switch (6). It is detected. Because the danger condition persists — that is, the thermostat (8) contact remains closed — the engine (5) immediately By re-energizing, it turns the on / off system (2) back to the off position. This cycle, line This is repeated with each attempt to open it by hand until it cools down.

[0035] Thanks to this arrangement, the security function is protected by the user’s conscious or unconscious intervention. It cannot be disabled. In known solutions, manually activating the flow organ by the user does not fully disable the protection. While eliminating it, this interference is detected by the position switch (6) in the system subject to the invention and the flow line (11) Because it is resealed each time, protection is maintained without interruption.

[0036] When the flow line (11) temperature returns to the safe level, the thermostat (8) changes state, locks the situation ends and the electronic card (10) no longer intervenes in the shutdown; the user It can return to normal operation with the flow lever (9). Thus, the reset is not left to the user's discretion. It becomes dependent on the actual security condition — the cooling of the line. In an alternative application, the lock In addition to the temperature dropping below a threshold to end, a manual reset by the user is also required. It is also foreseeable that this will happen. 6 35 40 Power Supply, Warning and Indicator

[0037] The battery pack (18) powers the electronic board (10) and the motor (5) independently of the mains. Preference In the application, the battery pack (18) consists of two Li-Ion cells (2S) connected in series, preferably two 18650 It consists of a cell and is placed on a battery holder board (19). In this way, the system is connected to the electrical grid. It can operate in environments where it is not available, and in automatic heaters, it provides protection even during power outages. It continues.

[0038] The system also includes a standard Type-C charger unit (20) for recharging the battery pack (18), battery a voltage monitoring unit (21) that monitors the voltage and the occupancy level (25%, 50%, 75%, 100%) It includes level indicator LEDs (22). These LEDs (22) are located on the electronic board (10). It is positioned in a way that is directly visible to the user; thus, user protection You can monitor the system's energy status at any time from the stove's control panel.

[0039] When the battery voltage drops below a certain lower limit, a low voltage warning unit (23) is activated. By entering, it alerts the user with an audible warning element (24) and / or a visual indicator; this is the safety system This is to prevent it from becoming vulnerable due to lack of power.

[0040] Audible warning element (24) when the on / off system (2) is triggered for the first time and the flow is interrupted. It activates and audibly warns the user. This initial warning is functional: the user is aware that the stove... that it does not stop on its own, the safety system (17) due to an overheating / re-ignition risk He understands that it has been activated and instead of forcing the lever (9), he intervenes in the stove properly. Audible warning, The user announces the event even when they are not at the stove.

[0041] External components such as motor (5), thermostat (8) and position switches (6, 7), electronic board (10) It connects to the system via the connection sockets / connectors (27) on it. The system is a power switch It can be opened and closed with (26). How the System Works

[0042] The operating principle of the safety system subject to the invention is as follows:

[0043] (a) While the furnace (12) is working, pellets flow from the storage (1) through the flow line (11) to the pot (14); opening- The closing system (2) is in the open position and this position is confirmed by the first position switch (6). The thermostat (8) continuously monitors the temperature of the flow line (11).

[0044] (b) The heat / flame flow line in the combustion zone moves upward along (11) and detection If the temperature at the point exceeds the threshold value (preferably 100 °C), the thermostat (8) changes state and The electronic board (10) drives the motor (5) in the closing direction.

[0045] (c) The motor (5) opens and closes the system (2) horizontally via the drive parts (3, 4). by moving it to the off position; when the second position switch (7) indicates the off position, the motor is stopped. Since the flow line (11) is closed, both the pellet flow stops and the tank (1) and the combustion zone are closed. The path of heat / flame between them is interrupted by a physical barrier.

[0046] (d) At the same time the user is warned by the audible warning element (24). Ignition of pellets in the tank (1) (Backfire) is thus prevented.

[0047] (e) Electronic card (10) maintains the lock status and monitors the position switches (6, 7) continues. If the user opens the flow lever (9) manually at this time, the first position switch (6) detects this and The motor (5) is restarted and the opening-closing system (2) is closed again; this cycle continues until the line cools down. It is repeated that many times. 7 35 40

[0048] (f) When the flow line (11) temperature drops below the threshold value, thermostat (8) changes state, locks The situation ends and the stove can return to normal operation.

[0049] (g) All these functions are powered from the mains thanks to the rechargeable battery pack (18). It is performed independently; the battery status is indicated by the level indicators (22) on the electronic board (10) It is monitored and the user is also warned at low voltage (23, 24).

[0050] In the application of the invention to automatic (electrically powered) stoves, pellets are transferred from the hopper (1) to the pot. (14) is conveyed by a feeder / screw (28); safety system (17) is again on the flow line (11) It is installed and the stove operates independently of its own battery, separate from the control system and mains electricity. It works with group (18). Thus, protection is maintained even in case of power failure.

[0051] The applications described above are examples only. Type of stove (manual / automatic), Type of temperature sensing element, threshold value, motor speed and supply voltage, on / off switch. such as the form of the system and drive components, the type of position switches, the number of batteries, and the circuit topology. The details may be modified without exceeding the scope of the invention. The scope of protection of the invention is defined by the claims. It is determined. 8

Claims

REQUESTS 1. For a pellet stove (12), the heat and / or flame in the combustion zone must pass through the pellet flow line (11). a safety device that prevents the pellets in the pellet hopper (1) from igniting (re-ignition) by advancing into the pellet hopper. The system (17) has the following feature: — on the pellet flow line (11) extending from the pellet hopper (1) to the combustion zone or on the thermal contact a thermostat (8) placed near the line to detect the temperature of the line in question; — located on the pellet flow line (11) and in open and closed position A pellet flow shut-off system that moves between and closes a section of the line with a physical barrier. system (2); — the opening and closing system (2) is moved by means of at least one drive part (3, 4). an electric motor (5); — at least one position switch (6, 7) that detects the position of the on / off system (2); — according to the information from the thermostat (8) and the said position switch (6, 7) the engine (5) triggered by activating the switch when the perceived temperature exceeds a predetermined threshold value. an electronic card (10) that puts the shutdown system (2) into the closed position; — and the system which powers the electronic card (10) and the motor (5) independently from the grid. Rechargeable battery that allows it to continue working even when mains power is unavailable or interrupted. a usable battery pack (18) It includes.

2. According to claim 1, the security system is (17); its feature is the opening-closing of the electronic card (10). After the system (2) is switched off, the thermostat (8) reports that the flow line (11) has cooled down. will maintain a lock state and throughout that lock state the position switch (6, 7) will be unlocked. by restarting the motor (5) when it reports that the closing system (2) has moved to the open position The opening and closing system (2) is designed to be closed again.

3. According to claim 2, the security system is (17); its feature is the open position of the on / off system (2). a first position switch (6) that detects the closed position and a second position switch (7) that detects the closed position including; the electronic card (10) receives the signal from the first position switch (6) during the lock state. This is when the system interprets the user's attempt to manually open the door as an error and initiates the closing process again.

4. The safety system (17) is according to claim 2 or 3; its feature is that the pellet flow of the stove (12) is controlled by the user. mechanically related to the opening and closing system (2) which enables it to be opened and closed manually. It includes a flow lever (9); so that the opening and closing system (2) can be done both manually with the said lever (9) and It can be driven by the motor (5) and form a dual-mode arrangement and in case of danger the motor (5) It is the interruption of the flow regardless of the position of the arm (9).

5. Security system (17) according to any of the previous requirements; its feature is opening-closing The system (2) has a slide that opens and closes the cross-section of the pellet flow line (11) by moving in the horizontal direction. It is organized in this way.

6. The safety system (17) according to any of the previous requirements; its feature is the engine (5) a geared DC motor, preferably with a 12 V DC supply and an output speed of approximately 5 rpm It has an engine. 9 35 40 7. Security system (17) according to any of the previous requirements; its feature is the electronic card (10), when the on / off system (2) reaches the target position, the signal from the relevant position switch (6, 7) It is arranged in such a way as to stop the motor (5) with the signal and thus the mechanism The aim is to prevent strain and unnecessary current draw.

8. The safety system (17) is according to any of the previous requirements; its feature is that the thermostat (8) opens. It is a limit thermostat with a temperature of approximately 100 °C.

9. The safety system (17) according to any of the previous requirements; its feature is the thermostat (8), flow near the combustion zone on line (11), before the heat reaches the pellet hopper (1) It is positioned in a way that allows it to be perceived.

10. Security system (17) according to any of the previous requirements; its feature is opening-closing an audible warning element that alerts the user when the system (2) is triggered for the first time and cuts off the fuel flow. (24) is included.

11. The security system (17) according to any of the previous requirements; its feature is the battery pack (18) Two Li-Ion cells (2S) connected in series, preferably placed on a battery holder board (19) It consists of 18,650 cells.

12. The security system (17) according to any of the previous requirements; its feature is the battery pack (18) It includes a Type-C charging unit (20) for recharging.

13. The security system (17) according to any of the previous requirements; its feature is the battery pack (18) a voltage monitoring unit (21) that monitors the voltage and an electronic board (10) that shows the load level Level indicator LEDs (22) positioned in a way that is visible to the user. It includes.

14. The security system (17) is based on any of the previous requirements; its feature is that the battery voltage is specified. a low voltage warning unit (23) which alerts the user when it falls below a lower limit and an audible It contains a warning element (24).

15. The security system (17) according to any of the previous requirements; its feature is the threshold in question. The temperature value can be adjusted with an adjustment element (25), preferably a potentiometer.

16. The safety system (17) is according to any of the previous requirements; its feature is the pellet in question. The stove (12) is a gravity-fed manual (non-electric) stove and the pellets are fed by a feeder It is the flow from the reservoir (1) through the flow line (11) to the ladle (14) by the effect of gravity alone.

17. The safety system (17) is according to any of claims 1 to 15; its feature is that the pellet in question automatic conveying the pellets of the stove (12) from the storage (1) to the pot (14) by a feeder / screw (28). (electrically powered) stove and safety system (17) from the stove's own control system and can operate independently of the grid electricity with its own battery pack (18) in case of a power outage It provides even the most basic protection.

18. A switch-on / switching system (2) that opens and closes the pellet flow line (11) of a pellet stove (12). It is a control circuit for controlling the motor (5); its feature is: — a grid-independent power supply housing a rechargeable battery pack (18) and an electronic board (10) carrying an output terminal (27); 35 — a shut-off when the temperature of the pellet flow line (11) exceeds a predetermined threshold value. thermostat (8) contact; — a second position switch (7) that detects the closed position of the on / off system (2); — and a first position that detects when the on / off system (2) leaves the closed position. key (6) including; and the thermostat (8) contact and the first (6) and second (7) position switches, inside the motor's (5) supply circuit, (a) When the thermostat (8) contact is closed, it will energize the motor (5) to shut it off, (b) power supply with the second position switch (7) when the on / off system (2) reaches the closed position. will cut the circuit, (c) opening-closing system (2) when it leaves the closed position via the first position switch (6) By resetting the power supply circuit, it will energize the motor (5) to turn it off again, (d) When the thermostat (8) contact opens, it will permanently cut off the supply circuit. It is the way in which they are connected to each other.

19. It is a control circuit according to claim 18; its feature is that the lock function in question is activated by the thermostat (8) contact. by directly connecting the position switches (6, 7) to each other, a separate processor or software It is realized electromechanically without the use of any other method.

20. It is a control circuit according to claim 18; its feature is that the lock function in question is controlled by an electronic board (10) implemented with a microcontroller, comparator circuit, logic gate or relay arrangement the thermostat (8) and position switches (6, 7) are connected as inputs to the card and the motor (5) It is driven by an output stage on the card.

21. The control circuit according to any of the claims 18 to 20; its feature is that the thermostat (8) opens. a limit thermostat with a temperature of approximately 100 °C, and position switches (6, 7) are microswitches It is a (micro switch).

22. A switch-on / shut-off system (2) that opens and closes the pellet flow line (11) of a pellet stove (12). The electronic board (10) that feeds the motor (5) consists of two Li-Ion cells connected in series. housing or connecting to the battery pack (18), a recharge of the battery pack (18) Type-C charging unit (20), voltage monitoring unit (21) that monitors its voltage, user on the card Level indicator LEDs (22) are positioned in such a way that they can be seen by a low voltage The warning unit (23) is an audible warning that is activated when the on / off system (2) is triggered for the first time. The element (24) and the motor (5) in question include an output terminal (27) connected to the supply circuit; This allows the card (10) to power the security function independently of the mains electricity.

23. According to Claim 22, the electronic card (10) is a feature of which is according to any of Claims 18 to 21. It forms part of the control circuit.

24. An electronic board (10) and a battery containing two Li-Ion cells connected in series, according to claim 22 or 23. Printed circuit board assembly including the slot card (19).

25. A pellet stove (12) which has a safety system according to any of Claims 1 to 17. (17), a control circuit according to any of Claims 18 to 21 or any of Claims 22 to 24. According to one, it contains an electronic card (10). 11 35 26. A method of preventing backfire in a pellet stove (12); its feature is the following steps It includes: — the temperature of the pellet flow line (11) extending from the pellet hopper (1) to the combustion zone Monitoring with thermostat (8); — an electronic system will shut down if the temperature exceeds a predetermined threshold (preferably 100 °C). The pellet flow opening-closing system (2) is closed by driving a motor (5) by card (10). bringing it to the position and closing the flow line (11) with a physical barrier; — confirming that the closed position has been reached with a position switch (7) and the motor (5) stopping; — When the on / off system (2) is triggered for the first time, the user will hear (24) warning; — Maintaining a lock-in state until the temperature drops below the threshold value, and during this period The opening and closing system (2) moves to the open position with a position switch (6) If detected, the motor (5) is restarted and the flow line (11) is closed again; — The lock state is terminated and normal operation resumes when the temperature drops below the threshold value. permission to work; — and all these steps are completed with an off-grid rechargeable battery pack (18) This is achieved through nutrition. 12

Images