Automatic fire extinguishing device for kitchen stove

Abstract

The utility model discloses a kind of kitchen stove head automatic fire extinguishing device, atomizing spray head in stove top upper is connected medicament bottle by fire extinguishing agent spray pump;One end of trigger rope is installed in trigger mechanism shell, other end hangs heavy block, temperature sensing element above each stove top respectively pulls the corresponding point of trigger rope, temperature sensing element is used to be lost fire fuse and release trigger rope, so that heavy block presses self-starting switch and drives self-starting switch to be conducted, first intermediate relay is started by self-starting switch, and control fire extinguishing agent spray pump conduction;After a certain time of fire extinguishing agent spray pump starting, fire extinguishing agent spray pump is closed, and water spraying starts.Compared with prior art, kitchen range lost fire can be automatically extinguished, ensure kitchen site personnel safety, avoid the threat of kitchen range lost fire to hotel restaurant and nominal loss.

Description

Technical Field

[0001] This utility model relates to fire safety in restaurants and hotels, and more particularly to an automatic fire extinguishing device for kitchen stoves. Background Technology

[0002] The stovetop area in a kitchen is typically 75-80cm high, while the sink area is slightly higher (85-90cm). Commercial kitchens, such as hotels, usually use a uniform height of 80cm, which is suitable for most Chinese adults (women 160-165cm, men 170-175cm).

[0003] When cooking on a gas stove, the high flame can reach 20-30cm. When cooking oil catches fire, the oil temperature is approximately 300-370℃, and once ignited, the flame can instantly leap to 50-110cm, accompanied by thick smoke. In addition, with the range hood operating and providing ample oxygen, the fire height can reach 80-130cm.

[0004] Hotel restaurants are densely populated areas, sometimes spanning multiple floors of accommodation. Hotel restaurant kitchens often have multiple staff members working there, are continuously connected to gas, and store flammable and explosive materials such as flour, starch, and even flammable and explosive chemical cleaning agents. Therefore, it is necessary to design an automatic fire extinguishing system for kitchen stoves. Utility Model Content

[0005] The present invention aims to solve at least one of the aforementioned technical problems by providing an automatic fire extinguishing device for kitchen stoves, which facilitates the rapid extinguishing of fires in kitchen stoves and ensures the safety of densely populated places such as hotels and restaurants.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An automatic fire extinguishing device for a kitchen stove includes a first intermediate relay and:

[0008] The agent supply mechanism includes agent bottles and multiple atomizing nozzles located above corresponding furnace heads, wherein the atomizing nozzles are connected to the agent bottles via extinguishing agent pumps;

[0009] The triggering mechanism includes an automatic start switch, a trigger rope, a weight, and multiple temperature-sensing elements located above corresponding burner heads. The burner head is the stove burner or stove position, used for placing pots and cooking pots. One end of the trigger rope is installed in the housing of the triggering mechanism, and the other end suspends the weight. The multiple temperature-sensing elements pull the trigger rope at corresponding points. The temperature-sensing elements are used to melt and release the trigger rope in case of fire, causing the weight to fall and hit the automatic start switch, thus driving the automatic start switch to conduct. The first intermediate relay is used to be activated by the automatic start switch and control the fire extinguishing agent spray pump to conduct.

[0010] Compared with the prior art, the beneficial effects of this application include: kitchen fires can be automatically extinguished, ensuring the safety of personnel on-site in the kitchen and avoiding threats and nominal losses to the hotel restaurant caused by kitchen fires.

[0011] As an improvement to the above technical solution, the temperature sensing element is a pull rope or lever that can be melted at ≥160℃.

[0012] As an improvement to the above technical solution, the temperature sensing element, the trigger rope, and the self-starting switch are sealed in the housing of the triggering mechanism, and the housing of the triggering mechanism is made of aluminum, copper, or stainless steel.

[0013] As an improvement to the above technical solution, the housing of the triggering mechanism is provided with a bulge corresponding to the temperature sensing element, the temperature sensing element is housed in the bulge, the outer wall of the bulge is provided with heat-receiving fins, and the inner wall of the bulge is provided with heat dissipation fins.

[0014] As an improvement to the above technical solution, the temperature sensing element is a pull rope, which pulls the trigger rope through a movable pulley, and the pull rope is divided into at least 3 sub-ropes that pull the movable pulley together.

[0015] As an improvement to the above technical solution, it also includes a water spraying mechanism and a first time relay. The water spraying mechanism includes multiple water spray heads located above the corresponding burners. The water spray heads are connected to tap water through an on / off valve or to a water storage tank through a water pump. The first time relay is used to control the fire extinguishing agent spray pump to stop after working for time T1, and is also used to control the water pump or the on / off valve to be turned on after the fire extinguishing agent spray pump has been working for time T1.

[0016] As an improvement to the above technical solution, a second time relay is also included, which is used to control the water pump to stop working after time T2.

[0017] As an improvement to the above technical solution, it also includes a solenoid valve for switching on and off the gas pipeline and a fourth intermediate relay. The first intermediate relay is used to control the fourth intermediate relay to be turned on, and the fourth intermediate relay is used to control the solenoid valve to be turned off. The first intermediate relay is self-locking.

[0018] As an improvement to the above technical solution, it also includes an audible and visual alarm and a fourth intermediate relay. The first intermediate relay is used to control the fourth intermediate relay to conduct, and the fourth intermediate relay is used to control the audible and visual alarm to be powered on and started. The first intermediate relay is self-locking.

[0019] As an improvement to the above technical solution, the kitchen is equipped with an electrical box located away from the stove. The first intermediate relay is installed in the electrical box, which is also equipped with a manual switch for controlling the power supply of the first intermediate relay. The manual switch is equipped with a locking pin to prevent it from malfunctioning. Attached Figure Description

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a circuit diagram of the automatic fire extinguishing device for kitchen stoves according to an embodiment of this utility model;

[0022] Figure 2 This is a control flowchart of the automatic fire extinguishing device for kitchen stoves according to an embodiment of this utility model;

[0023] Figure 3 This is a schematic diagram of the triggering mechanism of the automatic fire extinguishing device for kitchen stoves according to an embodiment of this utility model;

[0024] Figure 4 for Figure 3 An abbreviated diagram of the triggering mechanism is shown;

[0025] Figure 5 for Figure 4 This diagram shows the structure of the trigger mechanism after the bulge cover is opened;

[0026] Figure 6 for Figure 5 A partial view of the triggering mechanism is shown;

[0027] Figure 7 for Figure 5 Showing a front view of the triggering mechanism.

[0028] The accompanying drawings are only one specific embodiment of this utility model, and the form and structure of this specific embodiment should not limit the extension of other embodiments.

[0029] Automatic start switch SB1, manual switch SB2;

[0030] First intermediate relay KA1, fourth intermediate relay KA4;

[0031] HL sound and light alarm;

[0032] Solenoid valve KP1;

[0033] Extinguishing agent spray pump M1, water pump M2;

[0034] Triggering mechanism 100, housing 110, bulge 111, heated fins 112, heat dissipation fins 113, triggering rope 120, weight 130, temperature sensing element 140, movable pulley 150. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figure 5 , Figure 7 and Figure 1 This utility model provides an automatic fire extinguishing device for kitchen stoves, including a first intermediate relay KA1 and:

[0037] The agent supply mechanism includes agent bottles and multiple atomizing nozzles located above the corresponding furnace heads. The atomizing nozzles are connected to the agent bottles via extinguishing agent pump M1.

[0038] The triggering mechanism 100 includes an automatic start switch SB1, a trigger rope 120, a weight 130, and multiple temperature sensing elements 140 located above corresponding burner heads. The burner head is the stove burner or stove position, a work position for placing pots and cooking pots. One end of the trigger rope 120 is installed in the housing 110 of the triggering mechanism 100, and the other end suspends the weight 130. The multiple temperature sensing elements 140 pull the corresponding points of the trigger rope 120. The temperature sensing element 140 is used to release the trigger rope 120 when it is melted by fire, causing the weight 130 to fall and hit the automatic start switch SB1, thereby driving the automatic start switch SB1 to conduct. The first intermediate relay KA1 is used to be activated by the automatic start switch SB1 and control the fire extinguishing agent spray pump M1 to conduct.

[0039] The extinguishing agent contained in the bottle can be protein foam (P), which uses animal protein hydrolysate as a base. It forms a foam layer by covering the surface of the burning material, isolating oxygen. It is used after being mixed with water in a certain proportion. The foam has strong stability and good resistance to reignition. Extinguishing agents can also be fluoroprotein foam (FP), aqueous film-forming foam (AFFF), alcohol-resistant foam (AR), etc.

[0040] The processor integrates functions such as intermediate relays and time relays. The solution using the processor is an equivalent replacement for the first intermediate relay KA1 mentioned above.

[0041] During normal cooking, the flame height can reach 20-30cm, while the flame height can reach 50-110cm. With the range hood running and sufficient oxygen, the flame height can reach 80-130cm. Therefore, the temperature sensing element 140 is located at ≥50cm above the burner.

[0042] The trigger mechanism 100 is located above the stove. It is understandable that the encapsulation of the self-starting switch SB1 and the cable connected to the self-starting switch SB1 are made of flame-retardant materials. The cable connected to the self-starting switch SB1 is even encapsulated in a fire-resistant insulating tube, such as a ceramic tube.

[0043] The operation process of this utility model can be as follows: (Refer to...) Figures 3 to 5 , Figure 7 A trigger rope 120 above a four-position kitchen stove is pulled by four temperature sensing elements 140. Each temperature sensing element 140 pulls the trigger rope 120. The deviation of the trigger rope 120 corresponding to each temperature sensing element 140 / the amount pulled away is h. The height of the idle weight 130 and the self-starting switch SB1 is ≤h.

[0044] Reference Figures 5 to 7 When at least one burner of the stove catches fire, at least one temperature sensing element 140 releases the trigger rope 120, and the weight 130 can fall and press the self-starting switch SB1, causing the self-starting switch SB1 to conduct briefly or continuously.

[0045] Reference Figure 1 , Figure 2 When the first intermediate relay KA1 is energized, the fire extinguishing agent spray pump M1 controlled by it is powered on and puts into operation. The fire extinguishing agent spray pump M1 draws the fire extinguishing agent in the agent bottle to the atomizing nozzle. The multiple atomizing nozzles spray the stove and kitchen countertop below. The fire extinguishing agent itself depressurizes and foams, and / or reacts with high-temperature oil to foam. The foaming fire extinguishing agent isolates oxygen and oil, and the fire in the kitchen is extinguished.

[0046] Furthermore, as described below, after extinguishing the fire with the extinguishing agent, water should be sprayed onto the burner to cool the stove and prevent secondary fires.

[0047] Understandably, in the event of a kitchen fire, personal safety and property security are the top priority, and contamination of food inside the stove by fire extinguishing agents is an acceptable loss.

[0048] Compared with the prior art, the beneficial effects of this application include: kitchen fires can be automatically extinguished, ensuring the safety of personnel on-site in the kitchen and avoiding threats and nominal losses to the hotel restaurant caused by kitchen fires.

[0049] The temperature-sensing element 140 is a pull cord or lever that can be melted at ≥160℃. The pull cord can directly pull the trigger cord 120. The pull cord can be set with a diameter of 0.4-1mm to facilitate faster melting (burning and / or drying) of the cord. For example, nylon, cotton thread, hemp thread, waxed thread, and silk thread can be carbonized and broken at temperatures above 120℃. The pulling force of the 0.4-1mm diameter cord is ≥0.3kg. A weight 130 of 0.3kg or more can pull the trigger cord 120 and cause it to fall. The lever is used to drive the trigger cord 120 to bend and deflect at the corresponding point, i.e., to pull. The lever can be an easily meltable wax block, and the surface of the wax block can be covered with a pad to prevent the wax block from being crushed.

[0050] Ideally, the weight 130 should be ≥0.3kg, and the trigger rope 120 should also be a fine diameter.

[0051] In practice, oil contamination on the trigger rope 120 and the self-starting switch SB1 can affect the movement of the trigger rope 120 and / or the conductivity of the self-starting switch SB1. (Refer to...) Figures 3 to 7 In some embodiments of this utility model, the housing 110 of the trigger mechanism 100 is a sealed shell, and the temperature sensing element 140, the trigger rope 120, and the self-starting switch SB1 are sealed in the housing 110 of the trigger mechanism 100. The housing 110 of the trigger mechanism 100 is made of aluminum, copper, or stainless steel. Aluminum has a thermal conductivity of 237 W / m·K, and copper has a thermal conductivity of 401 W / m·K. High thermal conductivity makes them resistant to high temperatures, and they do not absorb too much heat, reducing heat loss and enabling them to quickly transfer heat to the interior.

[0052] Reference Figures 3 to 7 In some embodiments of this utility model, the housing 110 of the triggering mechanism 100 is provided with a bulge 111 corresponding to a temperature sensing element 140. The temperature sensing element 140 is housed in the bulge 111. The outer wall of the bulge 111 is provided with heat-receiving fins 112, and the inner wall of the bulge 111 is provided with heat dissipation fins 113.

[0053] Reference Figures 5 to 7 In some embodiments of this utility model, the temperature sensing element 140 is a pull rope, which pulls the trigger rope 120 through a movable pulley 150. The pull rope is divided into at least three sub-ropes that jointly pull the movable pulley 150. According to the force principle of the movable pulley 150, the force on the pull rope is less than the force on the trigger rope 120. (Refer to...) Figure 5 , Figure 6 The pull rope is divided into three sections to pull the movable pulley 150 together, and the trigger rope 120 is divided into two sections to pull the movable pulley 150. The pull rope is subjected to a force F1, and the trigger rope 120 is subjected to a force F2. Therefore, according to the force principle of the movable pulley 150, 3F1 = 2F2. Therefore, with the same weight 130, a thinner rope that is easier to break can be selected for the pull rope.

[0054] Reference Figure 1 , Figure 2In some embodiments of this invention, a water spraying mechanism and a first time relay KT1 are also included. The water spraying mechanism includes multiple water nozzles located above corresponding burner heads. The water nozzles are connected to tap water via an on / off valve or to a water storage tank via a water pump M2. The first time relay KT1 is used to control the extinguishing agent spray pump M1 to stop working after a time T1, and also to control the water pump M2 or the on / off valve to be turned on after the extinguishing agent spray pump M1 has worked for a time T1. In this invention, the extinguishing agent, atomized and deposited onto the burner head, for a time T1, isolates the oil on the stove from oxygen, thus extinguishing the fire. After this time T1, water is sprayed onto the stove, which not only further extinguishes any remaining flames but also lowers the temperature of the stove and its oil, preventing secondary fires.

[0055] Reference Figure 1 , Figure 2 In some embodiments of this utility model, it also includes a solenoid valve KP1 and a fourth intermediate relay KA4 for switching on and off the gas pipeline. The first intermediate relay KA1 is used to control the fourth intermediate relay KA4 to conduct, and the fourth intermediate relay KA4 is used to control the solenoid valve KP1 to be energized and shut off, so as to shut off the gas pipeline. The first intermediate relay KA1 is self-locking. Therefore, during the T1 time when the first intermediate relay KA1 is working, the fire extinguishing agent spray pump M1, the fourth intermediate relay KA4 and the solenoid valve KP1 are kept energized. While the stove sprays the fire extinguishing agent, the stove is stably shut off.

[0056] Reference Figure 1 , Figure 2 In some embodiments of this utility model, a second time relay KT2 is also included, which is used to control the water pump M2 to stop working after time T2.

[0057] Reference Figure 1 , Figure 2 In some embodiments of this utility model, it also includes an audible and visual alarm HL and a fourth intermediate relay KA4. The first intermediate relay KA1 is used to control the fourth intermediate relay KA4 to conduct, and the fourth intermediate relay KA4 is used to control the audible and visual alarm HL to be energized and activated. The first intermediate relay KA1 controls the fire extinguishing agent spray pump M1 to start working, that is, to start extinguishing the fire, and the audible and visual alarm is activated. The first intermediate relay KA1 is self-locking, so during the T1 time when the first intermediate relay KA1 is working, the fire extinguishing agent spray pump M1, the fourth intermediate relay KA4 and the audible and visual alarm HL remain energized. During the T1 time when the fire extinguishing agent is sprayed from the stove, the audible and visual alarm HL maintains the warning for at least T1 time. The audible and visual alarm HL is installed in the kitchen and / or the security room, and alerts the kitchen staff and security personnel for a sufficiently long time to avoid panic in the hotel restaurant. In the event of a fire, the kitchen staff and security personnel can determine whether to prepare an apology for the late service or whether to evacuate and persuade customers to leave.

[0058] Reference Figure 1 , Figure 2 Ideally, the fourth intermediate relay KA4 is self-locking, ensuring that even if the first intermediate relay KA1 is de-energized after time T1, the solenoid valve KP1 and the audible and visual alarm HL will continue to operate stably. After the solenoid valve KP1 and the audible and visual alarm HL have been operating stably for at least time T1, the operator can determine, based on the actual situation, whether to stop the audible and visual alarm and whether to maintain the energization of the solenoid valve KP1. For example, if the operator closes the manual valve on the gas pipeline during the stable operation time T1 of the solenoid valve KP1, the solenoid valve KP1 can be allowed to open again after time T1.

[0059] In some embodiments of this utility model, the kitchen is equipped with an electrical box located away from the stove. A first intermediate relay KA1, a first time relay KT1, etc., are housed in the electrical box. The electrical box also includes a manual switch SB2 for controlling the energization of the first intermediate relay KA1. The manual switch SB2 is equipped with a locking pin (i.e., a safety pin) to prevent malfunction. When the automatic start switch SB1 fails to operate, kitchen personnel can first remove the locking pin (i.e., the safety pin), thereby activating the manual switch SB2, allowing the fire extinguishing agent spray pump M1, water pump M2, etc., to operate sequentially according to the circuit diagram.

[0060] Reference Figure 1 The manual switch SB2 and the automatic start switch SB1 are the engines that determine whether each electrical appliance starts. Only the manual switch SB2 can be installed on the electrical box to prevent accidental activation.

[0061] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. An automatic fire extinguishing device for kitchen stoves, characterized in that, Including the first intermediate relay (KA1) and: The agent supply mechanism includes an agent bottle and multiple atomizing nozzles located above corresponding furnace heads. The atomizing nozzles are connected to the agent bottle via an extinguishing agent pump (M1). The triggering mechanism (100) includes an automatic start switch (SB1), a trigger rope (120), a weight (130), and multiple temperature sensing elements (140) located above the corresponding burners. One end of the trigger rope (120) is installed in the housing (110) of the triggering mechanism (100), and the other end suspends the weight (130). The multiple temperature sensing elements (140) pull the corresponding points of the trigger rope (120). The temperature sensing element (140) is used to release the trigger rope (120) by melting in case of fire, causing the weight (130) to fall and hit the automatic start switch (SB1) to drive the automatic start switch (SB1) to conduct. The first intermediate relay (KA1) is used to be activated by the automatic start switch (SB1) and control the fire extinguishing agent spray pump (M1) to conduct.

2. The automatic fire extinguishing device for kitchen stoves according to claim 1, characterized in that, The temperature sensing element (140) is a pull rope or lever that can be melted at ≥160℃.

3. The automatic fire extinguishing device for kitchen stoves according to claim 1, characterized in that, The temperature sensing element (140), the trigger rope (120) and the self-starting switch (SB1) are sealed in the housing (110) of the trigger mechanism (100), which is made of aluminum, copper or stainless steel.

4. The automatic fire extinguishing device for kitchen stoves according to claim 3, characterized in that, The housing (110) of the triggering mechanism (100) is provided with a bulge (111) corresponding to the temperature sensing element (140), the temperature sensing element (140) is housed in the bulge (111), the outer wall of the bulge (111) is provided with heat-receiving fins (112), and the inner wall of the bulge (111) is provided with heat dissipation fins (113).

5. The automatic fire extinguishing device for kitchen stoves according to claim 1, 3, or 4, characterized in that, The temperature sensing element (140) is a pull rope, which pulls the trigger rope (120) through a movable pulley (150), and the pull rope is divided into at least 3 sub-ropes that pull the movable pulley (150) together.

6. The automatic fire extinguishing device for kitchen stoves according to any one of claims 1 to 4, characterized in that, It also includes a water spraying mechanism and a first time relay (KT1). The water spraying mechanism includes multiple water spray heads located above the corresponding burners. The water spray heads are connected to tap water through an on / off valve or to a water storage tank through a water pump (M2). The first time relay (KT1) is used to control the fire extinguishing agent spray pump (M1) to stop after working for time T1, and is also used to control the water pump (M2) or the on / off valve to be turned on after the fire extinguishing agent spray pump (M1) has been working for time T1.

7. The automatic fire extinguishing device for kitchen stoves according to claim 6, characterized in that, It also includes a second time relay (KT2), ​​which is used to control the water pump (M2) to stop after working for time T2.

8. The automatic fire extinguishing device for kitchen stoves according to claim 6, characterized in that, It also includes a solenoid valve (KP1) and a fourth intermediate relay (KA4) for switching on and off the gas pipeline. The first intermediate relay (KA1) is used to control the fourth intermediate relay (KA4) to be turned on, and the fourth intermediate relay (KA4) is used to control the solenoid valve (KP1) to be turned off. The first intermediate relay (KA1) is self-locking.

9. The automatic fire extinguishing device for kitchen stoves according to claim 6, characterized in that, It also includes an audible and visual alarm (HL) and a fourth intermediate relay (KA4). The first intermediate relay (KA1) is used to control the fourth intermediate relay (KA4) to be turned on, and the fourth intermediate relay (KA4) is used to control the audible and visual alarm (HL) to be powered on and started. The first intermediate relay (KA1) is self-locking.

10. The automatic fire extinguishing device for kitchen stoves according to any one of claims 1 to 4, characterized in that, The kitchen is equipped with an electrical box located away from the stove. The first intermediate relay (KA1) is located in the electrical box. The electrical box is also equipped with a manual switch (SB2) for controlling the power supply of the first intermediate relay (KA1). The manual switch (SB2) is equipped with a locking pin to prevent it from malfunctioning.

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