Dry burning prevention protection device group

Abstract

The invention discloses an anti-dry burning protection device group, which is used for controlling a heating device and comprises a floater mechanism and a magnetic induction controller. The floater mechanism is used for detecting the height of the liquid level and provided with a magnetic driving part with the position changing along with the height of the liquid level, and the magnetic driving part is a magnet. The magnetic induction controller is used for being connected with the heating device and used for controlling the heating device to be turned on and turned off, and the magnetic induction controller can be triggered by the magnetic driving part to change the control state of the magnetic induction controller. When the detected liquid level of the floater mechanism changes to be lower than the preset position, the magnetic driving part changes the position and triggers the magnetic induction controller to enter the state of closing the heating device. According to the anti-dry-burning protection device set, the floater mechanism is matched with the magnetic trigger controller to achieve anti-dry-burning protection, reliability is good, and installation and arrangement flexibility is good.

Description

Technical Field

[0001] The present invention relates to a safety protection device, and particularly to a dry - burning prevention protection device group. Background Art

[0002] Some existing devices for heating liquids are usually provided with dry - burning prevention protection devices to prevent dry - burning. The existing dry - burning prevention devices generally adopt liquid sensors. The liquid sensors are inserted into the liquid for detection. The liquid sensors are electrically connected to the heating device through a control circuit. When the liquid sensor detects that the liquid level is lower than a predetermined height, a control electrical signal is generated, and the control circuit controls the heating device to stop heating according to the control electrical signal, thereby avoiding dry - burning. In the foregoing structure, the detection end of the liquid sensor is easily affected by the liquid (such as being wrapped by scale) and loses sensitivity or even fails, resulting in detection failure; in addition, since the liquid sensor needs to output an electrical signal externally, external wiring is required. When installing and setting, reasonable wiring arrangement is needed to ensure the waterproofness of the wiring, and the flexibility of installation and setting is limited. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a dry - burning prevention protection device group, which adopts a float mechanism cooperating with a magnetic trigger controller to achieve dry - burning prevention protection, with good reliability and good flexibility in installation and setting.

[0004] The dry - burning prevention protection device group according to an embodiment of the present invention is used to control a heating device, and includes: a float mechanism for detecting the level of the liquid, the float mechanism being provided with a magnetic drive part whose position changes with the height of the liquid level, the magnetic drive part being a magnet; a magnetic induction controller for being connected to the heating device and for controlling the opening and closing of the heating device, the magnetic induction controller being triggered by the magnetic drive part to change its controlled state; wherein, when the liquid level detected by the float mechanism changes to be lower than a predetermined position, the magnetic drive part changes its position and triggers the magnetic induction controller to enter a state of closing the heating device.

[0005] The anti-dry burning protection device group according to the embodiments of the present invention has at least the following beneficial effects: When the above anti-dry burning protection device group is in use, the float mechanism is set at the position where the liquid level needs to be detected, the magnetic induction controller is set at the corresponding position, and the magnetic induction controller is connected to the heating device. When the float mechanism detects that the liquid level is lower than the predetermined position, the magnetic drive part changes its position and triggers the magnetic induction controller through the magnetic field, so that the heating device is turned off, thereby realizing dry burning protection. The above anti-dry burning protection device group adopts the structure of the float mechanism cooperating with magnetic triggering to realize anti-dry burning protection. The float mechanism is a mechanical structure, which is not easily affected by scale and has good reliability; since the structure of magnetic triggering is a non-contact structure, the float mechanism directly detecting the water level and the magnetic induction controller controlling the heating device can be separately arranged. The float mechanism with a pure mechanical structure does not need to consider wiring problems, and the magnetic induction controller can also be not affected by the liquid due to its separate arrangement, so the flexibility of installation and setting is good.

[0006] According to some embodiments of the present invention, the float mechanism includes a float mounting bracket, a float ball, a swing rod, and a linkage rod. One end of the swing rod is hinged to the float mounting bracket, the float ball is arranged at the other end of the swing rod, one end of the linkage rod is fixed to the swing rod, and the magnetic drive part is arranged at the other end of the linkage rod.

[0007] According to some embodiments of the present invention, the linkage rod is connected with a mounting cover. The periphery of the mounting cover is fixed to the linkage rod. The mounting cover covers and fixes the magnetic drive part on the linkage rod and closes the magnetic drive part together with the linkage rod.

[0008] According to some embodiments of the present invention, the linkage rod is provided with a pressing boss. The mounting cover covers the pressing boss. The pressing boss abuts against the magnetic drive part. A sealing ring is sleeved on the outer periphery of the pressing boss. The sealing ring is located inside the mounting cover and abuts against the linkage rod, the mounting cover, and the magnetic drive part.

[0009] According to some embodiments of the present invention, the heating device is a burner and obtains gas through a gas valve. The magnetic induction controller is a valve for controlling the on-off of a passage. The magnetic induction controller is connected to the gas passage connected to the gas valve and closes the gas valve by cutting off the gas passage.

[0010] According to some embodiments of the present invention, the gas valve is provided with a flameout protection solenoid valve and a pilot gas output end. The gas valve is connected to a pilot gas assembly, and the pilot gas assembly includes a pilot gas burner and a thermocouple. The pilot gas burner is connected to the pilot gas output end through a pilot gas pipeline. The thermocouple is used to detect the flame of the pilot gas burner, and the thermocouple is electrically connected to the flameout protection solenoid valve. The magnetic induction controller is connected to the pilot gas pipeline and is used to control the on-off of the pilot gas pipeline. The magnetic induction controller is a normally open valve. When the detected liquid level changes to be lower than a predetermined position, the magnetic drive part changes its position and triggers the magnetic induction controller to enter a state of cutting off the pilot gas pipeline.

[0011] According to some embodiments of the present invention, the magnetic induction controller includes a valve body and a valve core. The valve body is provided with an air inlet passage, an air outlet passage, and a valve cavity. The valve core is arranged in the valve cavity, and the valve core has an open valve position and a closed valve position: at the open valve position, the air inlet passage and the air outlet passage are in communication with each other; at the closed valve position, the valve core disconnects the communication between the air inlet passage and the air outlet passage. The valve core is provided with a magnetic linkage part, and the magnetic linkage part is used to drive the valve core to switch positions. The magnetic linkage part and the magnetic drive part are linked and cooperated with each other through a magnetic field. When the magnetic drive part changes its position, it drives the magnetic linkage part to change its position through the magnetic field, so as to drive the valve core to switch positions.

[0012] According to some embodiments of the present invention, the air inlet passage and the air outlet passage are in communication with each other through the valve cavity. The cavity wall of the valve cavity is provided with a communication port for enabling the air inlet passage and the air outlet passage to be in communication. The valve core is provided with a sealing plug, and the sealing plug is used to open and block the communication port respectively when the valve core changes between the open valve position and the closed valve position. The valve core includes a core shaft part, and the core shaft part includes a mounting disc and a connecting shaft. One end of the connecting shaft is connected to the center of the mounting disc, the magnetic linkage part is fixed to the mounting disc, the sealing plug is arranged on the connecting shaft, a communication hole is opened on the cavity wall of the valve cavity, the communication port is the orifice of the communication hole, the sealing plug is arranged opposite to the communication port, a connecting hole is opened at the bottom of the communication hole, the mounting disc is slidably matched with the valve cavity along the axial direction of the connecting shaft, and the other end of the connecting shaft is slidably matched with the connecting hole along the axial direction of the connecting shaft.

[0013] According to some embodiments of the present invention, the valve body includes a main seat body and a sealing cover. The intake passage, the outlet passage, and the communication hole are provided in the main seat body. The main seat body is provided with a cavity groove, the communication hole is opened at the bottom of the cavity groove, the sealing cover is installed on the main seat body and seals the opening of the cavity groove, and the sealing cover and the cavity groove enclose to form the valve cavity.

[0014] According to some embodiments of the present invention, the main seat body is provided with a plug-in boss around the opening of the cavity groove, the sealing cover is provided with a mating sunk groove adapted to the plug-in boss, the sealing cover is in plug-in fit with the plug-in boss through the mating sunk groove, and a sealing ring is provided between the sealing cover and the main seat body. The sealing ring abuts against the periphery of the sealing cover at the opening of the mating sunk groove and the periphery of the main seat body at the plug-in boss.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0018] Figure 2 is Figure 1 an enlarged schematic view of part A of

[0019] Figure 3 is a schematic structural diagram of an embodiment of the present invention when the liquid level detected is lower than a predetermined value and the magnetic induction controller is in a state of controlling the heating device to be turned off;

[0020] Figure 4 is Figure 3 an enlarged schematic view of part B of

[0021] Figure 5 is a schematic structural diagram of the float mechanism of an embodiment of the present invention;

[0022] Figure 6 is a schematic structural diagram of an embodiment of the present invention for controlling a burner;

[0023] Figure 7 is a schematic structural diagram of an embodiment of the present invention for controlling the burner to be turned off.

[0024] Reference numerals:

[0025] Heating device 1;

[0026] Float mechanism 100, magnetic drive unit 110, float mounting bracket 120, floating ball 130, swing rod 140, linkage rod 150, mounting cover 160, rod body 141, first nut 142, second nut 143, pressing boss 151, U-shaped head 152, hinge shaft 153, end plate 1521, connecting plate 1522;

[0027] Magnetic induction controller 200, valve body 210, valve core 220, magnetic linkage unit 230, reset elastic member 240, air inlet passage 211, air outlet passage 212, valve cavity 213, communication port 214, communication hole 215, connection hole 216, main seat body 217, sealing cover member 218, sealing plug 221, core shaft member 222, balance elastic member 223, support plate 224, mounting disc 2221, connecting shaft 2222, plugging boss 2171, mating sink 2181;

[0028] Gas valve 300, flameout protection solenoid valve 310, pilot gas output end 320, gas input end 330, main gas output end 340;

[0029] Pilot assembly 400, pilot burner 410, thermocouple 420. Detailed implementation manners

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0034] Referring to Figures 1 to 7 , a dry-run protection device group for controlling a heating device 1, which includes: a float mechanism 100 and a magnetic induction controller 200. The float mechanism 100 is used to detect the liquid level height. The float mechanism 100 is provided with a magnetic drive part 110 whose position changes with the liquid level height, and the magnetic drive part 110 is a magnet. The magnetic induction controller 200 is used to be connected to the heating device 1 and to control the opening and closing of the heating device 1. The magnetic induction controller 200 can be triggered by the magnetic drive part 110 to change its controlled state. Among them, when the detected liquid level of the float mechanism 100 changes to be lower than a predetermined position, the magnetic drive part 110 changes its position and triggers the magnetic induction controller 200 to enter a state of turning off the heating device 1.

[0035] When the above dry-run protection device group is in use, the float mechanism 100 is set to the position where the liquid level needs to be detected, the magnetic induction controller 200 is set to the corresponding position, and the magnetic induction controller 200 and the heating device 1 are connected. When the float mechanism 100 detects that the liquid level is lower than a predetermined position, the magnetic drive part 110 changes its position and triggers the magnetic induction controller 200 through the magnetic field, so that the heating device 1 is turned off, thereby realizing dry-run protection. For the above dry-run protection device group, a structure of the float mechanism 100 cooperating with magnetic triggering is adopted to realize dry-run protection. The float mechanism 100 is a mechanical structure, not easily affected by water scale, and has good reliability; since the magnetic triggering structure is a non-contact structure, the float mechanism 100 directly detecting the water level and the magnetic induction controller 200 controlling the heating device 1 can be separately arranged. The purely mechanical float mechanism 100 does not need to consider wiring problems, and the magnetic induction controller 200 can also be not affected by the liquid due to being able to be separately arranged, so the flexibility of installation and setting is good.

[0036] In an embodiment, the float mechanism 100 includes a float mounting frame 120, a float ball 130, a swing rod 140 and a linkage rod 150. One end of the swing rod 140 is hinged to the float mounting frame 120, the float ball 130 is arranged at the other end of the swing rod 140, one end of the linkage rod 150 is fixed to the swing rod 140, and the magnetic drive part 110 is arranged at the other end of the linkage rod 150. The float mechanism 100 can be installed on the liquid container through the float mounting frame 120, and the float ball 130 can be immersed in the liquid to be detected. When the liquid level drops, the float ball 130 can follow the drop, so that the swing rod 140 can swing, and at the same time the linkage rod 150 is driven to swing, so that the magnetic drive part 110 changes its position, thereby triggering the magnetic induction controller 200. The above float mechanism 100 has a simple structure and is easy to implement.

[0037] In an embodiment, a linkage rod 150 is connected with a mounting cover 160. The periphery of the mounting cover 160 is fixed to the linkage rod 150. The mounting cover 160 covers and fixes the magnetic driving part 110 to the linkage rod 150 and closes the magnetic driving part 110 together with the linkage rod 150. With the above structure, the magnetic driving part 110 is firmly fixed, and the closed structure provides good protection for the magnetic driving part 110 to avoid liquid erosion. In the embodiment, the linkage rod 150 and the mounting cover 160 can be fixed by screws, or by riveting, welding, clamping and other methods.

[0038] In an embodiment, the linkage rod 150 is provided with a pressing boss 151. The mounting cover 160 covers the pressing boss 151. The pressing boss 151 abuts against the magnetic driving part 110. A sealing ring is sleeved on the outer periphery of the pressing boss 151. The sealing ring is located inside the mounting cover 160 and abuts against the linkage rod 150, the mounting cover 160 and the magnetic driving part 110. With the above structure, the installation of the magnetic driving part 110 can be more stable and the installation sealing performance can be better.

[0039] In an embodiment, the linkage rod 150 is a sheet metal body. One end of the linkage rod 150 is bent 180 degrees to form a U-shaped head 152. The U-shaped head 152 includes opposite end plates 1521 and a connecting plate 1522. The swing rod 140 includes a rod body 141, a first nut 142 and a second nut 143 arranged on the rod body 141. The rod body 141 is provided with a stud section. The stud section passes through the connecting plate 1522 of the U-shaped head 152. The first nut 142 and the second nut 143 are threadedly connected to the stud section and are respectively arranged on both sides of the connecting plate 1522 of the U-shaped head 152 and clamp and fix the connecting plate 1522 of the U-shaped head 152. The second nut 143 is arranged on the side of the connecting plate 1522 close to the end plate 1521. The end plate 1521 is provided with an opening adapted to the outer contour shape of the second nut 143. The second nut 143 passes through the opening of the end plate 1521, and the opening is non-circular. With the above structure, the linkage rod 150 and the swing rod 140 are positioned and fixed both axially and circumferentially along the swing rod 140. The structure for fixing is simple and easy to manufacture. In the embodiment, the second nut 143 is radially provided with a hinge shaft 153, and the hinge shaft 153 is hinged to the float mounting bracket 120, so that the swing rod 140 can swing.

[0040] In an embodiment, the heating device 1 is a burner and obtains gas through a gas valve 300. The magnetic induction controller 200 is a valve for controlling the on / off of a passage. The magnetic induction controller 200 is connected to the gas passage connected to the gas valve 300 and closes the gas valve 300 by cutting off the gas passage. With the above structure, the magnetic induction controller 200 is specifically a valve, and can control the heating device 1 by controlling the on / off of the gas passage. The structure is simple, and for some purely mechanical gas appliances, the modification is simple and the cost is low.

[0041] It can be imagined that the heating device 1 can also be an electric heater, and thus the magnetic induction controller 200 can also be a structure for controlling the on / off of a circuit, such as a reed switch, etc., and can be specifically configured according to actual situations.

[0042] In an embodiment, the gas valve 300 is provided with a flameout protection solenoid valve 310 and a pilot gas output end 320. The gas valve 300 is connected to a pilot gas assembly 400. The pilot gas assembly 400 includes a pilot burner 410 and a thermocouple 420. The pilot burner 410 is connected to the pilot gas output end 320 through a pilot gas pipeline. The thermocouple 420 is used to detect the flame of the pilot burner 410, and the thermocouple 420 is electrically connected to the flameout protection solenoid valve 310. The magnetic induction controller 200 is connected to the pilot gas pipeline and is used to control the on / off of the pilot gas pipeline. The magnetic induction controller 200 is a normally open valve. When the detected liquid level changes to be lower than a predetermined position, the magnetic drive part 110 changes its position and triggers the magnetic induction controller 200 to enter a state of cutting off the pilot gas pipeline. In the embodiment, the gas valve 300 can be connected to a gas source through its gas input end 330 and input gas to the heating device 1 through a main gas output end 340.

[0043] When the gas supplied to the pilot burner 410 is cut off, the flame goes out, the thermocouple 420 loses voltage, and the flameout protection solenoid valve 310 is de-energized, so that the gas valve 300 closes to cut off the gas supply, realizing the gas cut-off supply to the heating device 1. With the above structure, the pilot gas can be cleverly controlled, and the flameout protection solenoid valve 310 is used to cut off the gas supply. The structure of the gas valve 300 itself can be fully utilized to realize gas control. The structure is simple, the modification of existing gas appliances is easy, and since the magnetic induction controller 200 controls the relatively small flow of pilot gas, a large specification volume is not required.

[0044] It can be imagined that in some embodiments, the dry-burning prevention protection device group is not limited to controlling the gas valve 300 by controlling the pilot gas of the gas valve 300. For example, the on / off of the gas passage of the main input or main output of the gas valve 300 can also be controlled directly.

[0045] In an embodiment, the magnetic induction controller 200 includes a valve body 210 and a valve core 220. The valve body 210 is provided with an air inlet passage 211, an air outlet passage 212, and a valve chamber 213. The valve core 220 is disposed in the valve chamber 213. The valve core 220 has an open valve position and a closed valve position: at the open valve position, the air inlet passage 211 and the air outlet passage 212 are in communication with each other; at the closed valve position, the valve core 220 disconnects the communication between the air inlet passage 211 and the air outlet passage 212. The valve core 220 is provided with a magnetic linkage portion 230. The magnetic linkage portion 230 is used to drive the valve core 220 to switch positions. The magnetic linkage portion 230 and the magnetic drive portion 110 are interlocked and cooperated with each other through a magnetic field. When the magnetic drive portion 110 changes its position, the magnetic linkage portion 230 is driven to change its position through the magnetic field, so as to drive the valve core 220 to switch positions. The on-off control of the magnetic induction controller 200 is realized by adopting the above structure, and the structure is simple.

[0046] In an embodiment, the air inlet passage 211 and the air outlet passage 212 are in communication with each other through the valve chamber 213. The chamber wall of the valve chamber 213 is provided with a communication port 214 for enabling the air inlet passage 211 and the air outlet passage 212 to be in communication. The valve core 220 is provided with a sealing plug 221. The sealing plug 221 is used to open and block the communication port 214 respectively when the valve core 220 changes between the open valve position and the closed valve position. The valve core 220 includes a core shaft member 222. The core shaft member 222 includes a mounting disc 2221 and a connecting shaft 2222. One end of the connecting shaft 2222 is connected to the center of the mounting disc 2221. The magnetic linkage portion 230 is fixed to the mounting disc 2221. The sealing plug 221 is disposed on the connecting shaft 2222. A communication hole 215 is formed in the chamber wall of the valve chamber 213. The communication port 214 is the orifice of the communication hole 215. The sealing plug 221 is disposed opposite to the communication port 214. A connecting hole 216 is formed at the bottom of the communication hole 215. The mounting disc 2221 is slidably engaged with the valve chamber 213 along the axial direction of the connecting shaft 2222, and the other end of the connecting shaft 2222 is slidably engaged with the connecting hole 216 along the axial direction of the connecting shaft 2222. By adopting the above structure, the movement of the valve core 220 is stable, and the overall structure for realizing the on-off between channels is simple and concise, which is easy to manufacture and maintain.

[0047] In an embodiment, the communication hole 215 is the part where the air inlet passage 211 is directly communicated with the valve chamber 213, and the air outlet passage 212 is directly communicated with the valve chamber 213. The orifice of the communication hole 215, that is, the communication port 214, can control the communication and disconnection between the air inlet passage 211 and the valve chamber 213, so as to control the communication and disconnection between the air inlet passage 211 and the air outlet passage 212. In other embodiments, the communication port 214 may also be at other positions, for example, it is the communication port for the air outlet passage 212 and the valve chamber 213 to communicate with each other.

[0048] In an embodiment, a reset elastic member 240 is provided between the valve core 220 and the valve body 210. The valve core 220 has a tendency to be held in the open valve position through the reset elastic member 240, so that the magnetic induction controller 200 forms a normally open valve. The reset elastic member 240 can be a spring or other elastic structure.

[0049] In the embodiment, while the magnetic induction controller 200 is a normally open valve, the magnetic drive part 110 drives the magnetic linkage part 230 to act through repulsive force and drives the valve core 220 to the closed valve position. When the magnetic drive part 110 is away from the magnetic linkage part 230, the valve core 220 is reset to the open valve position through the reset elastic member 240. It can be imagined that the linkage between the magnetic drive part 110 and the magnetic linkage part 230 is not limited to using repulsive force. For example, it can also be linked through attractive force. When the magnetic drive part 110 and the magnetic linkage part 230 are linked through repulsive force, they are magnets with the same polarity on the corresponding sides; when the magnetic drive part 110 and the magnetic linkage part 230 are linked through attractive force, the magnetic linkage part 230 can be made of a metal that can be attracted by a magnet, such as iron, cobalt, nickel and their alloys.

[0050] In the embodiment, the plug 221 is elastic and sleeved on the outer periphery of the core shaft member 222. A cylindrical balance elastic member 223 is provided between the core shaft member 222 and the plug 221. The balance elastic member 223 is sleeved on the core shaft member 222 and is used to apply elastic force to the plug 221. With the above structure, when the plug 221 presses against and blocks the communication port 214, the attitude of the plug 221 can be automatically adjusted through the balance elastic member 223, so that the communication port 214 is blocked more stably and accurately.

[0051] In the embodiment, a support plate 224 is provided on one side of the plug 221. The support plate 224 is sleeved on the core shaft member 222 and is in contact with the plug 221. The balance elastic member 223 is provided between the support plate 224 and the core shaft member 222; a middle sink is provided on one side of the support plate 224 and a middle boss is formed on the other side. A protruding platform adapted to the middle sink is provided on the side of the plug 221 close to the support plate 224 and is inserted into the middle sink. One end of the balance elastic member 223 is sleeved on the middle boss and the other end abuts against the core shaft member 222. With the above structure, the elastic plug 221 can be fitted through the support plate 224. The balance elastic member 223 abuts against the support plate 224, and the support plate 224 can provide support for the plug 221 and the balance elastic member 223, so that the two can cooperate better; and through the setting of the protruding platform and the middle sink, the cooperation between the balance elastic member 223, the support plate 224 and the plug 221 can be made more stable. In the embodiment, the balance elastic member 223 can be a spring or other elastic structure.

[0052] In an embodiment, the valve body 210 includes a main seat body 217 and a cover member 218. The intake passage 211, the outlet passage 212, and the communication hole 215 are provided in the main seat body 217. The main seat body 217 is provided with a cavity groove, the communication hole 215 is provided at the bottom of the cavity groove, the cover member 218 is installed on the main seat body 217 and covers the opening of the cavity groove, and the cover member 218 and the cavity groove enclose a valve cavity 213. With the above structure, during assembly, the valve core 220 can be directly inserted into the main seat body 217 through the opening of the cavity groove, and then the cover member 218 is installed to complete the assembly, which is convenient for assembly.

[0053] In an embodiment, the main seat body 217 is provided with a plugging boss 2171 around the opening of the cavity groove, the cover member 218 is provided with a mating sunk groove 2181 adapted to the plugging boss 2171, the cover member 218 is plugged and mated with the plugging boss 2171 through the mating sunk groove 2181, and a sealing ring is provided between the cover member 218 and the main seat body 217. The sealing ring abuts against the positions around the opening of the mating sunk groove 2181 of the cover member 218 and the positions around the plugging boss 2171 of the main seat body 217. With the above structure, a stable seal can be formed between the cover member 218 and the main seat body 217, and at the same time, the cooperation between them is stable and the installation positioning is accurate.

[0054] In an embodiment, the cover member 218 and the main seat body 217 can be fixed by screws, or by means such as riveting, welding, clamping, etc.

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0056] The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A dry-run protection device group for controlling a heating device (1), characterized in that, Comprising: A float mechanism (100) for detecting the liquid level height, wherein the float mechanism (100) is provided with a magnetic drive part (110) whose position changes with the liquid level height, and the magnetic drive part (110) is a magnet; A magnetic induction controller (200) for connecting with the heating device (1) and for controlling the opening and closing of the heating device (1), and the magnetic induction controller (200) can be triggered by the magnetic drive part (110) to change its controlled state; Wherein, when the liquid level detected by the float mechanism (100) changes to be lower than a predetermined position, the magnetic drive part (110) changes its position and triggers the magnetic induction controller (200) to enter a state of closing the heating device (1).

2. The anti-dry burning protection device group according to claim 1, characterized in that: The float mechanism (100) includes a float mounting bracket (120), a float ball (130), a swing rod (140) and a linkage rod (150). One end of the swing rod (140) is hinged to the float mounting bracket (120), the float ball (130) is arranged at the other end of the swing rod (140), one end of the linkage rod (150) is fixed to the swing rod (140), and the magnetic drive part (110) is arranged at the other end of the linkage rod (150).

3. The anti-dry burning protection device group according to claim 2, wherein: The linkage rod (150) is connected with a mounting cover (160), the periphery of the mounting cover (160) is fixed to the linkage rod (150), and the mounting cover (160) covers and fixes the magnetic drive part (110) to the linkage rod (150) and closes the magnetic drive part (110) together with the linkage rod (150).

4. The anti-dry burning protection device group according to claim 3, characterized in that: The linkage rod (150) is provided with a pressing boss (151), the mounting cover (160) covers the pressing boss (151), the pressing boss (151) abuts against the magnetic drive part (110), and a sealing ring is sleeved on the outer periphery of the pressing boss (151). The sealing ring is located inside the mounting cover (160), and the sealing ring abuts against the linkage rod (150), the mounting cover (160) and the magnetic drive part (110).

5. The anti-dry burning protection device group according to claim 1, wherein: The heating device (1) is a burner and obtains gas through a gas valve (300), the magnetic induction controller (200) is a valve for controlling the on-off of a passage, the magnetic induction controller (200) is connected to the gas passage connected to the gas valve (300), and closes the gas valve (300) by cutting off the gas passage.

6. The anti-dry burning protection device group according to claim 5, characterized in that: The gas valve (300) is provided with a flameout protection solenoid valve (310) and a pilot gas output end (320). The gas valve (300) is connected to a pilot gas assembly (400). The pilot gas assembly (400) includes a pilot gas burner (410) and a thermocouple (420). The pilot gas burner (410) is connected to the pilot gas output end (320) through a pilot gas pipeline. The thermocouple (420) is used to detect the flame of the pilot gas burner (410), and the thermocouple (420) is electrically connected to the flameout protection solenoid valve (310). The magnetic induction controller (200) is connected to the pilot gas pipeline and is used to control the on-off of the pilot gas pipeline. The magnetic induction controller (200) is a normally open valve. When the detected liquid level changes to be lower than a predetermined position, the magnetic drive part (110) changes its position and triggers the magnetic induction controller (200) to enter a state of cutting off the pilot gas pipeline.

7. The anti-dry burning protection device group according to claim 5, characterized in that: The magnetic induction controller (200) includes a valve body (210) and a valve core (220). The valve body (210) is provided with an air inlet channel (211), an air outlet channel (212), and a valve cavity (213). The valve core (220) is arranged in the valve cavity (213). The valve core (220) has an open valve position and a closed valve position: at the open valve position, the air inlet channel (211) and the air outlet channel (212) are in communication with each other; at the closed valve position, the valve core (220) disconnects the communication between the air inlet channel (211) and the air outlet channel (212). The valve core (220) is provided with a magnetic linkage part (230). The magnetic linkage part (230) is used to drive the valve core (220) to switch positions. The magnetic linkage part (230) and the magnetic drive part (110) are linked and cooperated with each other through a magnetic field. When the magnetic drive part (110) changes its position, it drives the magnetic linkage part (230) to change its position through the magnetic field, so as to drive the valve core (220) to switch positions.

8. The anti-dry burning protection device group according to claim 7, characterized in that: The intake passage (211) and the outlet passage (212) communicate with each other through the valve cavity (213). A communication port (214) for enabling the intake passage (211) and the outlet passage (212) to communicate is provided on the cavity wall of the valve cavity (213). The valve core (220) is provided with a plug (221), and the plug (221) is used to open and block the communication port (214) respectively when the valve core (220) changes between the open valve position and the closed valve position; the valve core (220) includes a core shaft member (222), the core shaft member (222) includes a mounting disc (2221) and a connecting shaft (2222), one end of the connecting shaft (2222) is connected to the center of the mounting disc (2221), the magnetic linkage part (230) is fixed to the mounting disc (2221), the plug (221) is arranged on the connecting shaft (2222), a communication hole (215) is opened on the cavity wall of the valve cavity (213), the communication port (214) is the orifice of the communication hole (215), the plug (221) is arranged opposite to the communication port (214), a connecting hole (216) is opened at the bottom of the communication hole (215), the mounting disc (2221) is in sliding fit with the valve cavity (213) along the axial direction of the connecting shaft (2222), and the other end of the connecting shaft (2222) is in sliding fit with the connecting hole (216) along the axial direction of the connecting shaft (2222).

9. The anti-dry burning protection device group according to claim 8, characterized in that: The valve body (210) includes a main seat body (217) and a cover member (218). The intake passage (211), the outlet passage (212) and the communication hole (215) are arranged in the main seat body (217). The main seat body (217) is provided with a cavity groove, the communication hole (215) is opened at the bottom of the cavity groove, the cover member (218) is installed on the main seat body (217) and covers the orifice of the cavity groove, and the cover member (218) and the cavity groove enclose to form the valve cavity (213).

10. The anti-dry burning protection device group according to claim 9, wherein: The main seat body (217) is provided with a plug-in boss (2171) around the orifice of the cavity groove. The cover member (218) is provided with a mating sunk groove (2181) adapted to the plug-in boss (2171). The cover member (218) is in plug-in fit with the plug-in boss (2171) through the mating sunk groove (2181). A sealing ring is arranged between the cover member (218) and the main seat body (217), and the sealing ring abuts against the periphery of the cover member (218) at the orifice of the mating sunk groove (2181) and the periphery of the main seat body (217) at the plug-in boss (2171).

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