WO2018040433A1

WO2018040433A1 - Gas water heater and safety control system and method therefor

Info

Publication number: WO2018040433A1
Application number: PCT/CN2016/113301
Authority: WO
Inventors: 薛承志; 代先锋; 梁国荣; 唐晓峨; 钱晓林
Original assignee: 芜湖美的厨卫电器制造有限公司
Priority date: 2016-08-31
Filing date: 2016-12-29
Publication date: 2018-03-08
Also published as: ES2763798T3; EP3312523A4; EP3312523B1; CN107781999A; EP3312523A1

Abstract

Disclosed are a gas water heater and a safety control system and method therefor. The system comprises: an air exhauster (10) used to exhaust waste gas produced during combustion by a gas water heater; a rotary speed detection unit (20) used to detect the rotary speed of the air exhauster (10); a power acquisition unit (30) used to acquire an output power given value of the air exhauster (10); and an air-exhausting control unit (40) respectively connected to the air exhauster (10), the rotary speed detection unit (20) and the power acquisition unit (30), and used to determine an air pressure condition of an air outlet of the air exhauster (10) according to the rotary speed and the output power given value of the air exhauster (10) and to adjust the output power given value of the air exhauster (10) according to the air pressure condition of the air outlet of the air exhauster (10). The system can ensure that a gas water heater has a good combustion condition, guarantees the safe and reliable operation thereof and improves the control accuracy.

Description

Gas water heater and safety control system and method thereof

Technical field

The invention relates to the technical field of water heaters, in particular to a gas water heater and a safety control system and method thereof.

Background technique

At present, gas water heaters commonly found in the market include: D type (natural exhaust type), Q type (forced exhaust type), P type (natural exhaust), type G (forced exhaust) and W type (outdoor) Setup) and so on. Among them, Q-type and G-type gas water heaters are directly equipped with exhaust fans to force the exhaust gas during combustion to prevent the occurrence of residual gas explosion and the like.

In the related art, the Q-type gas water heater mostly uses the wind pressure detecting unit to detect the wind pressure of the tuyere, and then controls the exhaust fan and the ignition unit according to the detected wind pressure to ensure that the gas water heater can work normally. Although the wind pressure detecting unit can avoid the burning operation of the gas water heater under the condition of wind pressure backflow, the cost of the device is high, and the gas water heater is likely to be stopped due to slight wind pressure, and the user cannot use the gas normally.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, the first object of the present invention is to provide a safety control system for a gas water heater, which can ensure that the gas water heater has good combustion conditions, ensure safe and reliable operation of the gas water heater, and has a fast response speed and can provide accurate The air volume increases the control accuracy and the cost is relatively low.

A second object of the invention is to propose a gas water heater.

A third object of the present invention is to provide a safety control method for a gas water heater.

In order to achieve the above object, a first aspect of the present invention provides a safety control system for a gas water heater, comprising: an exhaust fan for exhausting exhaust gas generated when a gas water heater is burned; and a rotation speed detecting unit for detecting the row a speed of the fan; a power acquisition unit for obtaining an output power set value of the exhaust fan; and an exhaust control unit, the exhaust control unit and the exhaust fan, the rotation speed detecting unit, and the power acquisition The units are respectively connected to determine the wind pressure of the air outlet of the exhaust fan according to the rotation speed of the exhaust fan and the output power of the exhaust fan, and adjust the wind pressure according to the air outlet of the exhaust fan. The output power of the exhaust fan is given.

According to the safety control system of the gas water heater according to the embodiment of the present invention, the rotation speed of the exhaust fan is first detected by the rotation speed detecting unit, and the output power of the exhaust fan is obtained by the power acquisition unit, and then the exhaust control unit is based on the rotation speed of the exhaust fan. And the output power of the exhaust fan determines the air pressure of the air outlet of the exhaust fan, and adjusts the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan, thereby realizing the adjustment of the rotational speed of the exhaust fan to ensure During the operation of the gas water heater, the introduced gas and air can achieve good combustion conditions and ensure gas heat. The water is safe and reliable. At the same time, the output power of the exhaust fan is directly adjusted to the active control. Compared with the passive control of the exhaust fan speed, the response speed is fast, and the accurate air volume can be provided, and the control precision is improved. The cost of the entire system is relatively low.

According to an embodiment of the present invention, the exhaust air control unit determines the wind pressure of the air outlet of the exhaust fan according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and according to the exhaust fan When the air outlet pressure condition adjusts the output power of the exhaust fan, wherein the exhaust control unit determines that the air outlet pressure of the exhaust fan is a low wind pressure condition, the row is controlled The output power of the fan is decreased by a first preset value; if the exhaust control unit determines that the wind pressure of the air outlet of the exhaust fan is a wind pressure condition, the output power of the exhaust fan is controlled to be maintained. If the exhaust control unit determines that the air outlet pressure of the exhaust fan is a high wind pressure condition, the output power of the exhaust fan is controlled to increase by a second preset value.

According to an embodiment of the present invention, the safety control system for a gas water heater further includes a system control unit, wherein the system control unit and the exhaust control unit communicate with each other, wherein if the exhaust control unit determines The wind pressure of the air outlet of the exhaust fan is the highest wind pressure condition, or the speed of the exhaust fan is greater than the speed threshold, and the exhaust control unit sends a stop signal to the system control unit, so that the system control unit The gas water heater is stopped according to the shutdown signal.

According to an embodiment of the present invention, the safety control system for a gas water heater further includes: a water supply unit, the water supply unit is connected to the system control unit; a temperature acquisition unit, the temperature acquisition unit, and the system control unit Connected to obtain an outlet set temperature of the gas water heater and a cold water temperature of the gas water heater, wherein the system control unit sets a temperature according to the water supply unit, the outlet water setting temperature, and the cold water temperature. Calculating the total heat required by the gas water heater, and obtaining a current control command and an initial output power given value of the exhaust fan according to the total heat required by the gas water heater.

According to an embodiment of the present invention, the safety control system for a gas water heater further includes a gas unit, the gas unit being connected to the system control unit, the gas unit having a proportional valve, wherein the system control unit is The current control command controls the gas unit by controlling the proportional valve.

According to an embodiment of the invention, the gas water heater is a forced exhaust gas water heater.

In order to achieve the above object, a second aspect of the present invention provides a gas water heater including the above-described safety control system for a gas water heater.

The gas water heater of the embodiment of the present invention can determine the wind pressure of the air outlet of the exhaust fan according to the rotation speed of the exhaust fan and the output power of the exhaust fan through the above-mentioned safety control system, and according to the air pressure of the air outlet of the exhaust fan Adjusting the output power of the exhaust fan to adjust the speed of the exhaust fan to ensure that the gas water heater is mixed with the air to achieve good combustion conditions during operation, ensuring safe and reliable operation of the gas water heater And, since the output power of the exhaust fan is directly adjusted to the active control, compared to the exhaust fan Passive control of the rotational speed not only provides fast response, but also provides a more accurate air volume and improves control accuracy.

In order to achieve the above object, a third aspect of the present invention provides a safety control method for a gas water heater, comprising the steps of: detecting a rotational speed of an exhaust fan in the gas water heater; and obtaining a set value of an output power of the exhaust fan; And determining, according to the rotational speed of the exhaust fan and the output power of the exhaust fan, the wind pressure of the air outlet of the exhaust fan, and adjusting the output of the exhaust fan according to the air pressure of the air outlet of the exhaust fan; Power setpoint.

According to the safety control method of the gas water heater according to the embodiment of the invention, the rotational speed of the exhaust fan is first detected, and the output power of the exhaust fan is obtained, and then the exhaust fan is determined according to the rotational speed of the exhaust fan and the output power of the exhaust fan. The air pressure of the air outlet is adjusted, and the output power of the exhaust fan is adjusted according to the air pressure of the air outlet of the exhaust fan, thereby realizing the adjustment of the rotational speed of the exhaust fan, ensuring the gas and the introduced gas during the operation of the gas water heater After the air is mixed, it can achieve good combustion conditions and ensure the safe and reliable operation of the gas water heater. At the same time, the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the exhaust fan speed, not only the response speed is fast, but also a relatively accurate air volume can be provided, and the control precision is improved.

According to an embodiment of the present invention, the wind pressure of the air outlet of the exhaust fan is determined according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and according to the air pressure of the air outlet of the exhaust fan Adjusting the output power of the exhaust fan, including: if it is determined that the air outlet pressure of the exhaust fan is a low wind pressure condition, controlling the output power of the exhaust fan to decrease the first preset value If it is determined that the wind pressure of the air outlet of the exhaust fan is a wind pressure condition, the output power of the exhaust fan is controlled to remain unchanged; if the air pressure of the air outlet of the exhaust fan is determined to be a high wind pressure In the case, the output power of the exhaust fan is controlled to increase by a second preset value.

According to an embodiment of the present invention, the wind pressure of the air outlet of the exhaust fan is determined according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and according to the air pressure of the air outlet of the exhaust fan Adjusting the output power of the exhaust fan, the method further includes: if the wind pressure of the air outlet of the exhaust fan is determined to be the highest wind pressure condition, or the speed of the exhaust fan is greater than the speed threshold, then the gas water heater is controlled Stop.

According to an embodiment of the present invention, the safety control method of the gas water heater further includes: acquiring a water supply amount of the gas water heater, acquiring a water set temperature of the gas water heater, and acquiring a cold water temperature of the gas water heater Calculating a total heat required by the gas water heater according to the water supply amount, the water set temperature, and the cold water temperature, and obtaining a current control command and an initial output of the exhaust fan according to the total heat required by the gas water heater a power set value; controlling the combustion by controlling a proportional valve of the gas unit in the gas water heater according to the current control command.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent from the description of the embodiments in conjunction with the accompanying drawings And easy to understand, where:

1 is a block diagram of a safety control system for a gas water heater in accordance with one embodiment of the present invention;

2 is a graph showing a relationship between an output power set value of an exhaust fan and a rotational speed of an exhaust fan according to an embodiment of the present invention;

3 is a block diagram of a safety control system for a gas water heater according to another embodiment of the present invention;

4 is a graph showing the relationship between the total amount of heat required by the gas water heater and the control amount of the proportional valve and the output power of the exhaust fan according to an embodiment of the present invention;

FIG. 5 is a flow chart of a method of safety control of a gas water heater according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A gas water heater and its safety control system and method according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a block diagram of a safety control system for a gas water heater in accordance with one embodiment of the present invention. As shown in FIG. 1, the safety control system of the gas water heater includes an exhaust fan 10, a rotation speed detecting unit 20, a power acquisition unit 30, and an exhaust air control unit 40.

The exhaust fan 10 is used for exhausting exhaust gas generated when the gas water heater is burned. The rotation speed detecting unit 20 is for detecting the rotation speed of the exhaust fan. The power obtaining unit 30 is configured to obtain an output power given value of the exhaust fan. The exhaust air control unit 40 is connected to the exhaust fan 10, the rotational speed detecting unit 20 and the power acquiring unit 30, respectively, for determining the air outlet pressure of the exhaust fan 10 according to the rotational speed of the exhaust fan 10 and the output power of the exhaust fan 10. And adjusting the output power of the exhaust fan 10 according to the air outlet pressure of the exhaust fan.

Specifically, in the working process of the gas water heater, the rotation speed detecting unit 20 detects the rotation speed of the exhaust fan 10 in real time, and determines the wind pressure of the air outlet of the exhaust fan 10 according to the current output power setting value of the exhaust fan 10, and then according to the outflow The tuyere wind pressure condition adjusts the output power setting value of the exhaust fan 10, thereby realizing the adjustment of the rotation speed of the exhaust fan 10, ensuring that the gas water heater is mixed with the air to achieve good combustion conditions during the operation of the gas water heater. To ensure the safety and reliability of gas water heaters. At the same time, the output power of the exhaust fan is directly adjusted to the active control. Compared with the passive control of the exhaust fan speed, the response speed is fast, and the accurate air volume can be provided, and the control precision is improved. The cost of the entire system is relatively low.

In an embodiment of the present invention, the exhaust air control unit 40 determines the wind pressure of the air outlet of the exhaust fan 10 according to the rotational speed of the exhaust fan 10 and the output power of the exhaust fan 10, and according to the air outlet of the exhaust fan 10 Pressure regulation When the output power of the fan 10 is given a value, if the exhaust air control unit 40 determines that the air outlet pressure of the exhaust fan 10 is a low wind pressure condition, the output power of the exhaust fan 10 is controlled to decrease by a first preset. If the exhaust air control unit 40 determines that the air outlet pressure of the exhaust fan 10 is a neutral pressure condition, the output power of the exhaust fan 10 is kept constant; if the exhaust control unit 40 determines the outlet of the exhaust fan 10 When the tuyere wind pressure condition is a high wind pressure condition, the output power of the exhaust fan 10 is controlled to increase by a second preset value. The first preset value and the second preset value may be calibrated according to actual conditions, and the first preset value and the second preset value may be fixed values, or may be dynamically adjusted according to actual conditions.

Specifically, as shown in FIG. 2, at a certain output power given value of the exhaust fan 10, if the rotational speed R of the exhaust fan 10 is located below the first curve R1 (area I), the air outlet of the exhaust fan 10 is illustrated. The wind pressure is relatively small. At this time, the exhaust air control unit 40 controls the output power of the exhaust fan 10 to decrease by a first preset value, that is, the output power set value P=P-ΔP1 to reduce the rotational speed of the exhaust fan 10. If the rotational speed R of the exhaust fan 10 is located above the first curve R1 and below the second curve R2 (area II), it indicates that the wind pressure of the air outlet of the exhaust fan 10 and the rotational speed of the exhaust fan 10 are more suitable when the wind When the pressure is increased, due to the physical characteristics of the exhaust fan, the exhaust fan 10 naturally increases the rotational speed, so there is no need to adjust the output power set value of the exhaust fan 10; if the rotational speed R of the exhaust fan 10 is located above the second curve R2 and located The lower portion of the third curve R3 (region III) indicates that the wind pressure of the air outlet of the exhaust fan 10 is relatively large. At this time, the exhaust air control unit 40 controls the output power of the exhaust fan 10 to increase by a second preset value, that is, Output power set value P = P + ΔP2 to improve the exhaust fan 10 Rotating speed.

That is, when the output power of the exhaust fan 10 is given as P1, if the detected rotational speed of the exhaust fan 10 is R<C, the output power of the exhaust fan 10 is set to P1-ΔP1; ≤ R < B, the output power of the exhaust fan 10 is kept constant by P1; if B ≤ R < A, the output power of the exhaust fan 10 is adjusted to P1 + ΔP2, thereby realizing the exhaust fan The active control of the speed ensures that the air volume of the exhaust fan and the wind pressure of the air outlet can be quickly balanced to ensure that the gas water heater has good combustion conditions.

According to an embodiment of the present invention, as shown in FIG. 3, the safety control system of the gas water heater further includes: a system control unit 50, and the system control unit 50 and the exhaust control unit 40 communicate with each other, wherein if the exhaust control The unit 40 determines that the air outlet pressure of the exhaust fan 10 is the highest wind pressure condition, or the exhaust speed of the exhaust fan 10 is greater than the speed threshold, and the exhaust control unit 40 sends a shutdown signal to the system control unit 50 to cause the system control unit 50 to The shutdown signal controls the gas water heater to stop.

Specifically, as shown in FIG. 2, at a certain output power given value of the exhaust fan 10, if the rotational speed R of the exhaust fan 10 is located above the third curve R3 (area IV), the air outlet of the exhaust fan 10 is illustrated. The wind pressure is too high, and it is necessary to control the gas water heater to stop. For example, when the output power of the exhaust fan 10 is given as P1, if the speed of the exhaust fan 10 is R≥A, the gas water heater is controlled to be stopped; or, if current The speed of the exhaust fan 10 is higher than the set speed threshold (the highest limit speed), then the hot water heater is controlled to stop, thereby effectively ensuring the safety of the gas water heater.

According to an embodiment of the present invention, as shown in FIG. 3, the safety control system of the gas water heater described above further includes: The water supply unit 60 and the temperature acquisition unit (not specifically shown in the drawings). The water supply unit 60 is connected to the system control unit 50, and the temperature acquisition unit is connected to the system control unit 50. The temperature acquisition unit is configured to acquire the water set temperature of the gas water heater and the cold water temperature of the gas water heater. The system control unit 50 is configured according to the water supply unit 60. The water supply amount, the effluent set temperature and the cold water temperature are used to calculate the total heat required by the gas water heater, and the current control command and the initial output power of the exhaust fan 10 are obtained according to the total heat required by the gas water heater.

Further, as shown in FIG. 3, the safety control system of the gas water heater further includes: a gas unit 70 connected to the system control unit 50, and the gas unit 70 has a proportional valve (not specifically shown), wherein The system control unit 50 controls the gas unit 70 by controlling the proportional valve according to the current control command.

Specifically, after the gas water heater is powered on, the system control unit 50 first calculates the gas water heater to heat the cold water to the set water temperature according to the set water temperature of the gas water heater set by the user, the water supply amount of the water supply unit 60, and the cold water temperature. The total heat required, then, as shown in FIG. 4, the system control unit 50 acquires the control amount of the proportional valve (ie, the current control command) in the gas unit 70 according to the total heat required by the gas water heater, and acquires the output power of the exhaust fan 10 to The value is set as the initial output power reference. Finally, the system control unit 50 controls the proportional valve according to the acquired control amount of the proportional valve to control the gas unit 70, and transmits the initial output power set value to the exhaust control unit 40 through the CAN bus or the like.

After receiving the initial output power set value, the exhaust air control unit 40 controls the exhaust fan 10 according to the initial output power set value, and starts to detect the rotational speed of the exhaust fan 10 in real time by the rotational speed detecting unit 20. If the detected rotational speed of the exhaust fan 10 is in the region I, the output power of the exhaust fan 10 is given by P = P _initial - ΔP1, where P is _initially the initial output power given value; if the detected exhaust fan 10 is rotated It located in the region II, with ventilator output 10 for a given value of P = P _initial; if the rotation speed detected exhaust fan 10 is located in the region III, the ventilator output 10 for a given value of P = P _{_initial} + △ P2. According to the above steps, the cycle is continued until the output speed of the exhaust fan 10 is located in the area IV, or the speed of the exhaust fan 10 is greater than the speed threshold, or the user control stop command is received to control the gas water heater to stop.

During the operation of the gas water heater, if the effluent set temperature changes, or the water supply amount of the water supply unit 60 changes, the system control unit 50 reacquires the control amount of the proportional valve and the initial output power of the gas water heater, and according to the above The steps control the gas water heater.

In the embodiment of the present invention, the gas water heater may be a forced exhaust gas water heater, which is not limited herein.

FIG. 5 is a flow chart of a method of safety control of a gas water heater according to an embodiment of the present invention. As shown in FIG. 5, the safety control method of the gas water heater includes the following steps:

S1, detecting the rotation speed of the exhaust fan in the gas water heater.

S2, obtaining the output power of the exhaust fan.

S3, judging the wind pressure of the air outlet of the exhaust fan according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and adjusting the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan.

Specifically, in the working process of the gas water heater, the rotational speed of the exhaust fan is detected in real time, and the wind output of the exhaust fan of the exhaust fan is determined according to the current output power of the exhaust fan, and then the exhaust fan is according to the wind pressure of the air outlet. The output power is adjusted to adjust the speed of the exhaust fan to ensure that the gas water heater is mixed with the air to achieve good combustion conditions during operation, ensuring the safety and reliability of the gas water heater. . At the same time, the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the exhaust fan speed, not only the response speed is fast, but also a relatively accurate air volume can be provided, and the control precision is improved.

In an embodiment of the present invention, the wind pressure of the air outlet of the exhaust fan is determined according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and the output power of the exhaust fan is adjusted according to the air pressure of the air outlet of the exhaust fan. The fixed value includes: if it is determined that the air outlet pressure of the exhaust fan is a low wind pressure condition, the output power of the exhaust fan is controlled to decrease by a first preset value; if it is determined that the air outlet of the exhaust fan is a stroke In the case of pressure, the output power of the exhaust fan is kept constant; if it is judged that the air pressure of the air outlet of the exhaust fan is a high wind pressure condition, the output power of the exhaust fan is increased by a second preset value.

Specifically, as shown in FIG. 2, under a given output power of the exhaust fan, if the rotational speed R of the exhaust fan is located below the first curve R1 (area I), the wind pressure of the air outlet of the exhaust fan is indicated. Smaller, at this time, the output power of the exhaust fan is controlled to decrease by a first preset value, that is, the output power set value P=P-ΔP1, to reduce the speed of the exhaust fan; if the exhaust speed R of the exhaust fan is at the first Above the curve R1 and below the second curve R2 (Zone II), the wind pressure at the air outlet of the exhaust fan is more suitable than the speed of the exhaust fan. When the wind pressure increases, the exhaust air is exhausted due to the physical characteristics of the exhaust fan. The opportunity naturally increases the speed, so there is no need to adjust the output power setpoint of the exhaust fan; if the speed R of the exhaust fan is above the second curve R2 and below the third curve R3 (Zone III), then the exhaust fan is The wind pressure at the air outlet is relatively large. At this time, the output power of the exhaust fan is controlled to increase by a second preset value, that is, the output power set value P=P+ΔP2 to increase the speed of the exhaust fan.

That is to say, when the output power of the exhaust fan is given as P1, if the detected exhaust fan speed R<C, the output power of the exhaust fan is set to P1-△P1; if C≤R< B, the output power of the exhaust fan is kept constant. P1 is unchanged; if B≤R<A, the output power of the exhaust fan is adjusted to P1+△P2, so that the active control of the exhaust fan speed can be realized, and the air volume of the exhaust fan and the wind pressure of the air outlet can be ensured. The balance is quickly reached to ensure that the gas water heater has good combustion conditions.

Further, the wind pressure of the air outlet of the exhaust fan is determined according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and the output power of the exhaust fan is adjusted according to the air pressure of the air outlet of the exhaust fan, and includes: If it is judged that the wind pressure of the air outlet of the exhaust fan is the highest wind pressure condition, or the speed of the exhaust fan is greater than the speed threshold, the gas water heater is controlled to stop.

Specifically, as shown in FIG. 2, at a certain output power setting value of the exhaust fan, if the rotational speed R of the exhaust fan is located above the third curve R3 (area IV), the wind pressure of the air outlet of the exhaust fan is indicated. Too high, it is necessary to control the gas water heater to stop. For example, when the output power of the exhaust fan is set to P1, if the speed of the exhaust fan is R≥A, the gas water heater is controlled to stop; or, if the current exhaust fan speed Above the set speed threshold (maximum limit speed), the hot water heater is controlled to stop, thus effectively ensuring the safety of the gas water heater.

According to an embodiment of the present invention, the safety control method of the gas water heater further includes: obtaining a water supply amount of the gas water heater, obtaining a water set temperature of the gas water heater, and acquiring a cold water temperature of the gas water heater; and according to the water supply amount and the water output Set the temperature and cold water temperature to calculate the total heat required by the gas water heater, and obtain the current control command and the initial output power of the exhaust fan according to the total heat required by the gas water heater; and control the proportion of the gas unit in the gas water heater according to the current control command Valve for combustion control.

Specifically, after the gas water heater is powered on, the total heat required for the gas water heater to heat the cold water to the set temperature of the water outlet is calculated according to the set water temperature, the water supply amount and the cold water temperature of the gas water heater set by the user, and then, for example, As shown in FIG. 4, the control quantity of the proportional valve in the gas unit (ie, the current control command) is obtained according to the total heat required by the gas water heater, and the output power set value of the exhaust fan is obtained as the initial output power given value. Finally, the proportional valve is controlled according to the obtained control amount of the proportional valve to control the gas unit, and the exhaust fan is controlled according to the initial output power given value.

The speed of the exhaust fan is detected in real time and judged. In the initial output power reference value P _initial lower, if the rotational speed of the exhaust fan detected in an area I, the power output of the exhaust fan setpoint P = P _Initial - △ P1; if the rotational speed of the exhaust fan detected in the region of II, Then, the output power of the exhaust fan is given by the _initial value P=P; if the detected rotational speed of the exhaust fan is located in the area III, the output power of the exhaust fan is given by the _initial value P=P _initial + ΔP2. According to the above steps, the cycle is continued until the output speed of the exhaust fan is in the area IV, or the speed of the exhaust fan is greater than the speed threshold, or the user control stop command is received to control the gas water heater to stop.

During the operation of the gas water heater, if the set temperature of the effluent changes, or the amount of water supply changes, the control amount of the proportional valve and the initial output power of the gas water heater are regained, and the gas water heater is controlled according to the above steps.

In addition, embodiments of the present invention also provide a gas water heater including the above-described safety control system for a gas water heater.

The gas water heater of the embodiment of the present invention can determine the wind pressure of the air outlet of the exhaust fan according to the rotation speed of the exhaust fan and the output power of the exhaust fan through the above-mentioned safety control system, and according to the air pressure of the air outlet of the exhaust fan Adjusting the output power of the exhaust fan to adjust the speed of the exhaust fan to ensure that the gas water heater is mixed with the air to achieve good combustion conditions during operation, ensuring safe and reliable operation of the gas water heater Moreover, since the output power of the exhaust fan is directly adjusted to the active control, compared with the passive control of the exhaust speed of the exhaust fan, not only the response speed is fast, but also a relatively accurate air volume can be provided, and the control precision is improved. .

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature may be "on" or "under" the second feature unless otherwise specifically stated and defined. The first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A safety control system for a gas water heater, comprising:

An exhaust fan for exhausting exhaust gas generated when the gas water heater is burned;

a rotation speed detecting unit, configured to detect a rotation speed of the exhaust fan;

a power acquisition unit, configured to acquire an output power of the exhaust fan; and

An exhaust air control unit, the exhaust air control unit is respectively connected to the exhaust fan, the rotation speed detecting unit and the power acquiring unit, and is configured to be given according to the rotation speed of the exhaust fan and the output power of the exhaust fan The value determines the wind pressure of the air outlet of the exhaust fan, and adjusts the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan.
The safety control system for a gas water heater according to claim 1, wherein the exhaust air control unit determines an air outlet of the exhaust fan according to a rotational speed of the exhaust fan and an output power of the exhaust fan In the case of wind pressure, and according to the wind pressure of the air outlet of the exhaust fan, the output power of the exhaust fan is adjusted, wherein

If the exhaust control unit determines that the air outlet pressure condition of the exhaust fan is a low wind pressure condition, controlling the output power of the exhaust fan to decrease by a first preset value;

If the exhaust air control unit determines that the air outlet pressure condition of the exhaust fan is a stroke pressure condition, the output power of the exhaust fan is controlled to remain unchanged;

If the exhaust air control unit determines that the air outlet pressure of the exhaust fan is a high wind pressure condition, the output power of the exhaust fan is controlled to increase by a second preset value.
The safety control system for a gas water heater according to claim 1 or 2, further comprising a system control unit, wherein the system control unit and the exhaust control unit communicate with each other, wherein

If the exhaust control unit determines that the air outlet pressure condition of the exhaust fan is the highest wind pressure condition, or the exhaust fan speed is greater than the speed threshold, the exhaust control unit sends a shutdown signal to the system control a unit, wherein the system control unit controls the gas water heater to stop according to the shutdown signal.
The safety control system for a gas water heater according to claim 3, further comprising:

a water supply unit, the water supply unit being connected to the system control unit;

a temperature acquisition unit, the temperature acquisition unit is connected to the system control unit, and configured to acquire a water set temperature of the gas water heater and a cold water temperature of the gas water heater, wherein

The system control unit calculates the total heat required by the gas water heater according to the water supply amount of the water supply unit, the set water set temperature, and the cold water temperature, and obtains a current control command according to the total heat required by the gas water heater. The initial output power of the exhaust fan is a given value.
A safety control system for a gas water heater according to claim 4, further comprising a gas unit The gas unit is connected to the system control unit, and the gas unit has a proportional valve, wherein

The system control unit controls the gas unit by controlling the proportional valve according to the current control command.
The safety control system for a gas water heater according to claim 1, wherein the gas water heater is a forced exhaust gas water heater.
A gas water heater characterized by comprising a safety control system for a gas water heater according to any one of claims 1-6.
A safety control method for a gas water heater, characterized in that the method comprises the following steps:

Detecting a rotation speed of the exhaust fan in the gas water heater;

Obtaining an output power set value of the exhaust fan;

Determining the wind pressure of the air outlet of the exhaust fan according to the rotational speed of the exhaust fan and the output power of the exhaust fan, and adjusting the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan Desired point.
The safety control method for a gas water heater according to claim 8, wherein the wind pressure of the air outlet of the exhaust fan is determined according to the rotation speed of the exhaust fan and the output power of the exhaust fan, and according to The wind pressure of the air outlet of the exhaust fan adjusts the output power of the exhaust fan, including:

If it is determined that the wind pressure of the air outlet of the exhaust fan is a low wind pressure condition, the output power of the exhaust fan is controlled to decrease by a first preset value;

If it is determined that the wind pressure of the air outlet of the exhaust fan is a wind pressure condition, the output power of the exhaust fan is controlled to remain unchanged;

If it is determined that the wind pressure of the air outlet of the exhaust fan is a high wind pressure condition, the output power of the exhaust fan is controlled to increase by a second preset value.
The safety control method for a gas water heater according to claim 8 or 9, wherein the wind pressure of the air outlet of the exhaust fan is determined according to the rotational speed of the exhaust fan and the output power of the exhaust fan, And adjusting the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan, and further comprising:

If it is determined that the wind pressure of the air outlet of the exhaust fan is the highest wind pressure condition, or the speed of the exhaust fan is greater than the speed threshold, the gas water heater is controlled to be stopped.
The method for safety control of a gas water heater according to claim 8, further comprising:

Obtaining a water supply amount of the gas water heater, obtaining a water set temperature of the gas water heater, and acquiring a cold water temperature of the gas water heater;

Calculating a total heat required by the gas water heater according to the water supply amount, the water set temperature, and the cold water temperature, and obtaining a current control command and an initial output power of the exhaust fan according to the total heat required by the gas water heater Desired point;

The combustion control is performed by controlling a proportional valve of the gas unit in the gas water heater according to the current control command.