Dual dry-burning prevention mechanism and electric water boiler with same

By introducing both active and passive anti-dry-burning mechanisms into the electric water heater, and using a combination of a magnetic ring and a magnetic sensor with a temperature sensor, the problem of heating element dry-burning caused by float ball or microswitch failure is solved, achieving safe and reliable dual protection.

CN224415368UActive Publication Date: 2026-06-26GUANGDONG MAXI ELECTRIC APPLIANCE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG MAXI ELECTRIC APPLIANCE CO LTD
Filing Date
2025-06-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing electric water heaters cannot effectively prevent the heating element from burning dry when the float or microswitch fails, posing a safety hazard.

Method used

It adopts a dual anti-dry-burning mechanism with both active and passive features. Through the combination of a magnetic ring and magnetic sensor with a temperature probe, along with a temperature sensor and main control chip, it achieves dual protection for water volume and temperature, ensuring that the heating element only heats when there is sufficient water.

Benefits of technology

It achieves both active and passive dry-burn protection for electric water heaters, preventing the heating element from dry-burning before water is added. It has a simple structure, low cost, and long service life.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224415368U_ABST
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Abstract

The utility model discloses a double dry -burning prevention mechanism and electric water boiler with the double dry -burning prevention mechanism, double dry -burning prevention mechanism includes display operator and temperature probe, and the front end of temperature probe is equipped with magnetic ring motion rod, and the magnetic ring motion rod is equipped with the magnetic ring that can move under the buoyancy effect, temperature sensor and the magnetic inductor that cooperate with the magnetic ring of temperature probe, display operator includes main control chip, temperature sensor and the magnetic inductor with main control chip electricity is connected. The utility model can realize initiative type + passive type's double dry -burning protection, and whether the water tank is full of water is perceived in advance, if full of water, then allows heating pipe heating, if not full of water, then can not open machine heating, avoids the phenomenon of heating pipe dry -burning before not filling water, simple structure, low in cost, and the effect of dry -burning prevention is good.
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Description

[Technical Field]

[0001] This utility model relates to a dual anti-dry-burning mechanism and an electric water heater equipped with the dual anti-dry-burning mechanism. [Background Technology]

[0002] Most existing electric water heaters use a float ball added to the top of the water tank. When the water in the tank reaches a certain level, the float ball rises, which drives the linkage rod to push the micro switch to turn on the power and make the heating element heat up. When the water in the tank decreases to a certain level, the float ball falls, which drives the linkage rod to push the micro switch to turn off the power and the heating element stops heating, thus achieving the effect of preventing dry burning.

[0003] In the above structure, if the float ball or microswitch fails, the heating element will enter a dry-burning state when power is applied in a waterless state, and the dry-burning cannot be stopped, which will cause danger.

[0004] This utility model is an innovative design based on the aforementioned defects. [Summary of the Invention]

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a dual dry-burn protection mechanism that combines active and passive features. It can detect in advance whether there is a certain amount of water. If there is a certain amount of water, heating is allowed. If there is not a certain amount of water, heating is not allowed. This avoids the phenomenon of the heating element burning dry before water is added. The structure is simple, the cost is low, and the dual anti-dry-burn mechanism has a good anti-dry-burn effect.

[0006] Another objective of this invention is to overcome the shortcomings of the prior art and provide an electric water heater with dual dry-burn protection that combines active and passive protection.

[0007] The purpose of this utility model is achieved as follows:

[0008] A dual anti-dry-burning mechanism is characterized by comprising a display operator and a temperature probe rod. The front end of the temperature probe rod is provided with a magnetic ring moving rod, and the magnetic ring moving rod is provided with a magnetic ring that can move on it under the action of buoyancy. The temperature probe rod is provided with a temperature sensor and a magnetic sensor that cooperates with the magnetic ring. The display operator includes a main control chip, and the temperature sensor and magnetic sensor are electrically connected to the main control chip.

[0009] The dual anti-dry-burning mechanism described above is characterized in that the temperature probe rod is arranged horizontally, the magnetic ring moving rod is arranged vertically, and the lower part of the magnetic ring moving rod is connected to the temperature probe rod.

[0010] The dual anti-dry-burning mechanism described above is characterized in that the magnetic ring moving rod is provided with a limiting structure that restricts the up-and-down movement of the magnetic ring.

[0011] The dual anti-dry-burning mechanism described above is characterized in that the temperature probe rod is a hollow tube, and the temperature sensor and magnetic sensor are installed inside the temperature probe rod.

[0012] The dual anti-dry-burning mechanism described above is characterized in that it further includes a main controller, which includes a relay, and the relay is electrically connected to the main control chip of the display operator.

[0013] The dual anti-dry-burning mechanism described above is characterized in that the magnetic sensor has pin A and pin B, pin A is connected to the ground wire, pin B is connected to a 5V pull-up resistor, and the magnetic sensor is connected to the I / O interface of the main control chip.

[0014] As described above, the dual anti-dry-burning mechanism is characterized in that when the magnetic ring is located at the lower part of the magnetic ring moving rod, the magnetic ring is close to the magnetic sensor, and pins A and B of the magnetic sensor are connected, the high level is converted to a low level, and output to the I / O interface of the main control chip. The main control chip determines that the low level signal of the I / O interface is a waterless state and sends a command to force the relay of the main controller to disconnect. When the embossed magnetic ring is located at the upper part of the magnetic ring moving rod, the magnetic ring is far from the magnetic sensor, and pins A and B of the magnetic sensor are disconnected and not connected. At this time, the 5V output is a stable 5V signal through the pull-up resistor, which converts the low level to a high level and outputs to the I / O interface of the main control chip. The main control chip determines that the high level signal of the I / O interface is a water-containing state and restores the relay connection of the main controller.

[0015] The dual anti-dry-burning mechanism described above is characterized in that the main control chip is equipped with a first-level temperature detection module, a second-level temperature detection module, a third-level temperature detection module, a fourth-level temperature detection module, a fifth-level temperature detection module, a sixth-level temperature detection module, and a seventh-level temperature detection module; when the temperature sensor detects a water temperature ≥47℃, it initiates dry-burning temperature slope detection; if the water temperature rise rate is ≥2℃ in 4 seconds and this rate is met 7 times consecutively, the main control chip determines that a dry-burning fault has occurred.

[0016] The dual anti-dry-burning mechanism described above is characterized in that the first temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 1st to the 4th second; the second temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 5th to the 8th second; the third temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 9th to the 12th second; the fourth temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 13th to the 16th second; the fifth temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 17th to the 20th second; the sixth temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 21st to the 24th second; and the seventh temperature detection module is used to detect whether the temperature rises by ≥2 degrees Celsius from the 25th to the 28th second.

[0017] An electric water heater with the above-mentioned dual anti-dry-burning mechanism is characterized in that the electric water heater includes a water tank, a heater is provided at the bottom of the water tank, and a temperature probe is arranged above the heater.

[0018] The beneficial effects of this utility model are:

[0019] This invention can achieve dual dry-burn protection with both active and passive features. It can detect in advance whether there is a certain amount of water. If there is a certain amount of water, heating is allowed. If there is not a certain amount of water, heating is not allowed. This avoids the phenomenon of dry burning before water is added. It has a simple structure, low cost, and good dry-burn protection effect.

[0020] This utility model of electric water heater can achieve dual dry-burn protection of active and passive types. It can detect in advance whether the water tank of the electric water heater is full. If it is full, the heating element is allowed to heat. If it is not full, it cannot be turned on to heat, thus avoiding the phenomenon of the heating element dry-burning before water is added, and has a long service life. [Attached Image Description]

[0021] Figure 1 This is a structural diagram of the present invention when it is fixed in the water tank of an electric water heater;

[0022] Figure 2 yes Figure 1 A sectional view;

[0023] Figure 3 This is a structural diagram of the utility model and the heater;

[0024] Figure 4 This is a structural diagram of the utility model and the heater;

[0025] Figure 5 This is the circuit schematic diagram of this utility model;

[0026] Figure 6 This is the circuit diagram of the magnetic sensor of this utility model;

[0027] Figure 7 This is a schematic diagram of the main control chip of this utility model.

Detailed Implementation Methods

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] A dual anti-dry-burning mechanism includes a display operator 1 and a temperature probe 2. The front end of the temperature probe 2 is provided with a magnetic ring moving rod 3. The magnetic ring moving rod 3 is provided with a magnetic ring 4 that can move on it under the action of buoyancy. The temperature probe 2 is provided with a temperature sensor 5 and a magnetic sensor 6 that cooperates with the magnetic ring. The display operator 1 includes a main control chip 7, and the temperature sensor 5 and the magnetic sensor 6 are electrically connected to the main control chip 7.

[0030] In this invention, the temperature probe 2 is arranged horizontally, and the magnetic ring moving rod 3 is arranged vertically, with the lower part of the magnetic ring moving rod 3 connected to the temperature probe 2.

[0031] This utility model provides limiting structures 31 at both the upper and lower ends of the magnetic ring moving rod 3 to restrict the up and down movement of the magnetic ring. The limiting structure 31 includes limiting blocks, limiting rings, limiting sleeves, or limiting plates, etc., provided at the upper and lower ends of the magnetic ring moving rod 3.

[0032] The magnetic ring 4 of this invention has a central through hole 41 for fitting onto the magnetic ring moving rod 3. The magnetic ring 4 is a hollow structure, giving it a certain degree of buoyancy. The magnetic ring 4 is circular in shape, but it can also be other shapes, such as square or prismatic, and all are designed to be hollow.

[0033] like Figure 1 , Figure 2 As shown, the temperature probe 2 of this invention is a hollow tube, and the temperature sensor 5 and the magnetic sensor 6 are installed inside the temperature probe 2. The temperature sensor 5 and the magnetic sensor 6 of this invention adopt a two-in-one structure and are connected by a connecting wire 51. The rear end of the temperature probe 2 is connected to a fixing cover 110 fixed on the water tank 100. The fixing cover 110 is provided with a hole 111 for the connecting wire 51 to pass through.

[0034] The magnetic sensor 6 of this invention can be a magnetically controlled switch, and the magnetic ring 4 is a magnetic float.

[0035] This utility model also includes a main controller 8, which includes a relay 81, and the relay 81 is electrically connected to the main control chip 7 of the display operator 1.

[0036] The main control chip 7 of this utility model is also provided with a magnetic induction circuit. The magnetic induction circuit is provided with an I / O interface 70. The magnetic sensor 6 of this utility model is provided with pin A 61 and pin B 62. Pin A 61 is connected to ground wire 63, and pin B 62 is connected to 5V pull-up resistor 64. The magnetic sensor 6 is connected to the I / O interface 70 of the main control chip 7.

[0037] When this invention is installed inside the water tank of an electric water heater, when the water level in the tank is low, the magnetic ring is located at the lower part of the magnetic ring moving rod, and the magnetic ring is close to the magnetic sensor. The A and B pins of the magnetic sensor are connected, the high level is converted to a low level, and output to the I / O interface of the main control chip. The main control chip determines that the low level signal of the I / O interface indicates a waterless state and sends a command to force the relay of the main controller to disconnect, disconnecting the power supply, and the heater of the electric water heater does not work. When the water level in the tank rises to a certain height, the embossed part on the magnetic ring is located at the upper part of the magnetic ring moving rod, the magnetic ring is far away from the magnetic sensor, and the A and B pins of the magnetic sensor are disconnected and no longer connected. At this time, a stable 5V signal is output through the pull-up resistor, causing the low level to convert to a high level and output to the I / O interface of the main control chip. The main control chip determines that the high level signal of the I / O interface indicates a water-containing state, restores the relay connection of the main controller, connects the power supply, and the heater of the electric water heater starts to work, thereby achieving the effect of active anti-dry burning.

[0038] The main control chip 7 of this utility model is equipped with a first-level temperature detection module 71, a second-level temperature detection module 72, a third-level temperature detection module 73, a fourth-level temperature detection module 74, a fifth-level temperature detection module 75, a sixth-level temperature detection module 76, and a seventh-level temperature detection module 77. The main control chip 7 also includes a dry-burning temperature slope detection module; when the temperature sensor detects a water temperature ≥47℃, the dry-burning temperature slope detection module initiates the dry-burning temperature slope detection program; if the water temperature rise rate is ≥2℃ in 4 seconds, and this rate is met 7 times consecutively, the main control chip determines it to be a dry-burning fault.

[0039] The first-level temperature detection module 71 of this invention detects whether the temperature rises by ≥2 degrees Celsius from the 1st to the 4th second; the second-level temperature detection module 72 detects whether the temperature rises by ≥2 degrees Celsius from the 5th to the 8th second; the third-level temperature detection module 73 detects whether the temperature rises by ≥2 degrees Celsius from the 9th to the 12th second; the fourth-level temperature detection module 74 detects whether the temperature rises by ≥2 degrees Celsius from the 13th to the 16th second; the fifth-level temperature detection module 75 detects whether the temperature rises by ≥2 degrees Celsius from the 17th to the 20th second; the sixth-level temperature detection module 76 detects whether the temperature rises by ≥2 degrees Celsius from the 21st to the 24th second; and the seventh-level temperature detection module 77 detects whether the temperature rises by ≥2 degrees Celsius from the 25th to the 28th second. This achieves a passive anti-dry-burning effect, which can be activated after the active anti-dry-burning mechanism fails. This invention provides dual dry-burn protection, combining active and passive features. It detects in advance whether the water tank (or inner liner) is full. If it is full, the heating element is allowed to heat; if it is not full, the machine cannot be turned on to heat, thus preventing the heating element from dry-burning before water is added.

[0040] This utility model also includes an electric water heater with the above-mentioned dual anti-dry-burning mechanism. The electric water heater includes a water tank 100, a heater 101 is provided at the lower part of the water tank 100, and a temperature probe 2 is provided above the heater 101, so that the magnetic ring 4, the temperature sensor 5 and the magnetic inductor 6 that cooperates with the magnetic ring are also provided above the heater 101.

[0041] The heater 101 of this utility model can be a fishhook-shaped heating tube or a circular heating tube, etc. One end of the heater 101 is connected to a fixed cover 110 fixed on the water tank 100, and a connection terminal 120 is provided at the end of the heater 101 that passes through the fixed cover 110.

[0042] In this invention, the temperature probe 2, magnetic ring 4, temperature sensor 5, and magnetic induction sensor 6 that cooperates with the magnetic ring are positioned above the heater 101. This prevents dry-burning heating when there is water at the temperature sensor 5 and magnetic induction sensor 6 but no water at the heater location. This electric water heater provides both active and passive dry-burning protection. It detects in advance whether the water tank is full; if full, heating is allowed; if not full, heating is not allowed, preventing dry-burning of the heating element before water is added, thus extending its service life.

Claims

1. A dual anti-dry-burning mechanism, characterized in that... It includes a display operator (1) and a temperature probe (2). The front end of the temperature probe (2) is provided with a magnetic ring moving rod (3). The magnetic ring moving rod (3) is provided with a magnetic ring (4) that can move on it under the action of buoyancy. The temperature probe (2) is provided with a temperature sensor (5) and a magnetic sensor (6) that cooperates with the magnetic ring. The display operator (1) includes a main control chip (7). The temperature sensor (5) and the magnetic sensor (6) are electrically connected to the main control chip (7).

2. The dual anti-dry-burning mechanism according to claim 1, characterized in that... The temperature probe rod (2) is set horizontally, and the magnetic ring moving rod (3) is set vertically. The lower part of the magnetic ring moving rod (3) is connected to the temperature probe rod (2).

3. The dual anti-dry-burning mechanism according to claim 1, characterized in that... The magnetic ring moving rod (3) is provided with a limiting structure (31) to restrict the up and down movement of the magnetic ring.

4. The dual anti-dry-burning mechanism according to claim 1, characterized in that... The temperature probe (2) is a hollow tube, and the temperature sensor (5) and magnetic sensor (6) are installed inside the temperature probe (2).

5. The dual anti-dry-burning mechanism according to claim 1, characterized in that... It also includes a main controller (8), which includes a relay (81) and is electrically connected to the main control chip (7) of the display operator (1).

6. The dual anti-dry-burning mechanism according to claim 1, characterized in that... The magnetic sensor (6) has pin A (61) and pin B (62). Pin A (61) is connected to ground (63), and pin B (62) is connected to a 5V pull-up resistor (64). The magnetic sensor (6) is connected to the I / O interface (70) of the main control chip (7).

7. A dual anti-dry-burning mechanism according to claim 6, characterized in that... When the magnetic ring is located at the lower part of the magnetic ring moving rod, the magnetic ring is close to the magnetic sensor, and pins A and B of the magnetic sensor are connected, changing the high level to a low level and outputting to the I / O interface of the main control chip. The main control chip determines that the low level signal of the I / O interface indicates a waterless state and sends a command to force the relay of the main controller to disconnect. When the magnetic ring is located at the upper part of the magnetic ring moving rod, the magnetic ring is far from the magnetic sensor, and pins A and B of the magnetic sensor are disconnected and no longer connected. At this time, the 5V output is a stable 5V signal through the pull-up resistor, changing the low level to a high level and outputting to the I / O interface of the main control chip. The main control chip determines that the high level signal of the I / O interface indicates a water-containing state and restores the relay connection of the main controller.

8. The dual anti-dry-burning mechanism according to claim 1, characterized in that... The main control chip (7) is equipped with a first-level temperature detection module (71), a second-level temperature detection module (72), a third-level temperature detection module (73), a fourth-level temperature detection module (74), a fifth-level temperature detection module (75), a sixth-level temperature detection module (76), and a seventh-level temperature detection module (77). When the temperature sensor detects that the water temperature is ≥47℃, it starts the dry burning temperature slope detection. If the water temperature rise rate is ≥2℃ in 4 seconds and meets this rate in 7 consecutive tests, the main control chip determines that it is a dry burning fault.

9. A dual anti-dry-burning mechanism according to claim 8, characterized in that... The first temperature detection module (71) is used to detect whether the temperature rises by ≥2 degrees from the 1st to the 4th second. The second temperature detection module (72) is used to detect whether the temperature rises by ≥2 degrees from the 5th to the 8th second. The third temperature detection module (73) is used to detect whether the temperature rises by ≥2 degrees from the 9th to the 12th second. The fourth temperature detection module (74) is used to detect whether the temperature rises by ≥2 degrees from the 13th to the 16th second. The fifth temperature detection module (75) is used to detect whether the temperature rises by ≥2 degrees from the 17th to the 20th second. The sixth temperature detection module (76) is used to detect whether the temperature rises by ≥2 degrees from the 21st to the 24th second. The seventh temperature detection module (77) is used to detect whether the temperature rises by ≥2 degrees from the 25th to the 28th second.

10. An electric water heater with a dual anti-dry-burning mechanism as described in any one of claims 1-9, characterized in that... The electric water heater includes a water tank (100), a heater (101) is provided at the bottom of the water tank (100), and a temperature probe (2) is provided above the heater (101).