Relay and range hood control method

Abstract

The invention discloses a relay and range hood control method, which comprises the following steps that a relay is powered on, and a mutual inductor and a smoke sensor are connected into a circuit; the relay identifies the working state of the range hood through the mutual inductor, and meanwhile, the smoke sensor detects the oil smoke condition in a smoke collecting cavity of the relay in real time: if the range hood is in a starting state, the relay is started; if the range hood is in the power-off state and the smoke sensor does not detect that the smoke exists in the smoke collecting cavity of the relay, the relay continues to keep the power-off state; if the range hood is in a shutdown state and the smoke sensor detects that the smoke exists in the smoke collecting cavity of the relay, the relay is started to operate; compared with the prior art, according to the control method of the relay and the range hood, the connecting line is arranged on the relay to be connected with the mutual inductor, even if the relay and the range hood are not of the same brand, the relay can still judge the working state of the range hood through the mutual inductor, interaction with the range hood is achieved, binding sale is rejected, and a user has free selection.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and particularly to a control method for a relay and a range hood. Background Art

[0002] The split unit includes a range hood and a relay. Existing split units are sold as complete sets. The range hood is connected to the common flue through the relay. The smoke collecting cavity of the range hood is connected to the smoke collecting cavity of the relay, and the smoke collecting cavity of the relay is connected to the common flue. The range hood and the relay cooperate with each other through the control logic controlled by the main control module to achieve the purification of oil fume. Since the relay and the range hood are sold in a set, it brings inconvenience to the user's choice. If the user has already purchased a range hood and wants to add a relay later, the existing range hood needs to be replaced, or after the split unit has been used for a period of time and the user wants to replace the range hood, the relay also needs to be replaced, increasing the user's usage cost and causing waste. Summary of the Invention

[0003] The purpose of the present invention is to provide a control method for a relay and a range hood, which is used to solve the above technical problems.

[0004] A control method for a relay and a range hood is used for the linkage of the relay and the range hood. The range hood is connected to the common flue through the relay. The smoke collecting cavity of the range hood is connected to the smoke collecting cavity of the relay, and the smoke collecting cavity of the relay is connected to the common flue. A smoke sensor is provided in the smoke collecting cavity of the relay, and the smoke sensor is used to detect the oil fume condition entering the smoke collecting cavity of the relay. The relay is also provided with a current transformer, and the current transformer is used to be clamped to the live wire or the neutral wire of the power cord of the range hood. The current transformer is used to detect the current of the range hood and transmit the detected current to the main control board of the relay. The control method for the relay and the range hood includes the following steps:

[0005] Power on the relay, and connect the current transformer and the smoke sensor to the circuit;

[0006] The relay identifies the working state of the range hood through the current transformer, and at the same time the smoke sensor continuously detects the oil fume condition in the smoke collecting cavity of the relay:

[0007] If the range hood is in the on state, turn on the relay;

[0008] If the range hood is in the off state and the smoke sensor does not detect oil fume in the smoke collecting cavity of the relay, the relay continues to maintain the off state;

[0009] If the range hood is in the off state and the smoke sensor detects oil fume in the smoke collecting cavity of the relay, the relay starts to operate.

[0010] According to an embodiment of the present invention, the relay judges the working current of the range hood through a current transformer and calculates the real-time power P of the range hood. If P > 5W, it is judged that the range hood is in the on state; if P ≤ 5W, it is judged that the range hood is in the off state.

[0011] According to an embodiment of the present invention, when the range hood is in the on state, the relay is turned on and operates at a low power. The smoke sensor continuously detects the oil fume condition in the smoke collection cavity of the relay. If the smoke sensor detects that the smoke concentration 0 < C ≤ C1, the relay continues to operate at a low power. If the smoke sensor detects that the smoke concentration C > C1, the relay operates at a high power.

[0012] According to an embodiment of the present invention, when the relay operates at a high power, the relay continues to identify the working state of the range hood through the current transformer, and at the same time, the smoke sensor continues to continuously detect the oil fume condition in the smoke collection cavity of the relay:

[0013] If P > 5W and C > C1, the relay continues to operate at a high power;

[0014] If P > 5W and 0 < C ≤ C1, after the relay operates at a high power for a time T1, it switches to a low power operation;

[0015] If P ≤ 5W and C > C1, the relay continues to operate at a high power;

[0016] If P ≤ 5W and 0 < C ≤ C1, the relay switches to a low power operation;

[0017] If P ≤ 5W and C = 0, the relay stops operating.

[0018] According to an embodiment of the present invention, if P > 5W and 0 < C ≤ C1, the relay operates at a power P1; if P ≤ 5W and 0 < C ≤ C1, the relay operates at a power P2, and P2 > P1.

[0019] According to an embodiment of the present invention, when the relay operates at a high power, the relay calculates the power of the range hood once every interval time T2 based on the current of the range hood detected by the current transformer.

[0020] According to an embodiment of the present invention, when the range hood is in the off state, if the smoke sensor detects that the smoke concentration C > 0, the relay starts and enters the anti-backflow mode.

[0021] According to an embodiment of the present invention, when the range hood is in the shutdown state, if the smoke sensor detects that the smoke concentration C > 0, the relay starts and operates at power P3. The power P3 corresponds to the rated speed W3 of the fan of the relay. The main control board of the relay continuously detects the actual speed W31 of the fan of the relay and calculates the difference between the actual speed W31 and the rated speed W3. If W31 - W3 > ΔW1, the relay continues to operate at power P3. If W31 - W3 ≤ ΔW1, the relay stops operating, where ΔW is the minimum threshold of the set speed difference.

[0022] According to an embodiment of the present invention, when the relay operates at power P3, the smoke sensor continuously detects the smoke concentration in the smoke collection cavity of the relay. If ΔW2 ≥ W31 - W3 > ΔW1, the relay continues to operate at power P3. If W31 - W3 > ΔW2, the relay will increase the power and operate at power P4, where P4 > P3. The power P4 corresponds to the rated speed W4 of the fan of the relay. The main control board of the relay continuously detects the actual speed W41 of the fan of the relay and calculates the difference between the actual speed W41 and the rated speed W4. If W41 - W4 > ΔW1, the relay continues to operate at power P4. If W41 - W4 ≤ ΔW1, the relay will reduce the power to P3 for operation. If ΔW2 ≥ W41 - W4 > ΔW1, the relay will further increase the operating power of its fan.

[0023] According to an embodiment of the present invention, after the relay enters the anti-backflow mode, when the relay operates for a time T1 and the smoke sensor detects that the smoke concentration C = 0 in the smoke collection cavity of the relay, the relay stops operating. After the relay enters the stop operation state from the anti-backflow mode, the smoke sensor detects the oil fume concentration once every interval time T2. When C > 0, the relay starts again.

[0024] Compared with the prior art, the control method of the relay and the range hood of the present invention has the following advantages:

[0025] In the control method of the relay and the range hood of the present invention, a connecting wire is set on the relay to connect the current transformer. The current transformer can be clamped on the live wire or the neutral wire of the power cord of the range hood. Even if the relay and the range hood are not of the same brand, the relay can still judge the working state of the range hood through the current transformer and interact with the range hood, rejecting bundled sales and giving users the freedom to choose.

[0026] In the control method of the relay and the range hood of the present invention, since a smoke sensor is arranged in the smoke collection cavity of the relay, the smoke sensor can detect the smoke state in the smoke collection cavity of the relay. Especially when the relay judges that the range hood is in the shutdown state through the current transformer, if the smoke sensor can still detect that there is oil fume in the smoke collection cavity of the relay, the relay will start and enter the anti-backflow mode to discharge the oil fume, avoiding the oil fume from flowing back into the kitchen space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 System diagram of the range hood and the relay

[0028] Figure 2 Flow direction of the cooking fume when the range hood and the relay are operating normally

[0029] Figure 3 Flow direction of the cooking fume when the cooking fume backs up

[0030] The implementation and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0031] The following will disclose multiple embodiments of the present invention in the form of diagrams. For the sake of clarity, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some conventional structures and components will be shown in a simple schematic manner in the diagrams.

[0032] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, then the directional indications will also change accordingly.

[0033] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the order or sequence. Nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] To further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

[0035] The present invention discloses a control method for a relay and a range hood. The control method for the relay and the range hood disclosed by the present invention is used for the linkage of the relay and the range hood. The range hood is connected to a common flue through the relay. The smoke collecting cavity of the range hood is connected to the smoke collecting cavity of the relay. The smoke collecting cavity of the relay is connected to the common flue. A smoke sensor is provided in the smoke collecting cavity of the relay. The smoke sensor is used to detect the oil fume condition entering the smoke collecting cavity of the relay. The relay is also provided with a current transformer. The current transformer is used to be clamped to the live wire or the neutral wire of the power supply line of the range hood. The current transformer is used to detect the current of the range hood and transmit the detected current to the main control board of the relay. The control method for the relay and the range hood includes the following steps:

[0036] The relay is powered on, and the current transformer and the smoke sensor are connected to the circuit;

[0037] The relay identifies the working state of the range hood through the current transformer, and at the same time the smoke sensor continuously detects the oil fume condition in the smoke collecting cavity of the relay:

[0038] If the range hood is in the on state, the relay is turned on;

[0039] If the range hood is in the off state and the smoke sensor does not detect oil fume in the smoke collecting cavity of the relay, the relay continues to remain in the off state;

[0040] If the range hood is in the off state and the smoke sensor detects oil fume in the smoke collecting cavity of the relay, the relay is turned on and runs.

[0041] The present invention aims to provide a control method for a relay and a range hood, enabling interaction between relays and range hoods of different brands, giving users the freedom to independently select range hoods and relays, which can not only reduce the user's usage cost but also avoid waste. In the control method of the relay and the range hood of the present invention, the relay has a current transformer connecting wire, and the current transformer is connected to the relay through a terminal block. When connecting to the range hood, the current transformer is clamped to the live wire or neutral wire of the power supply wire of the range hood. The current transformer can identify the current passing through the live wire or neutral wire of the power supply wire of the range hood. The relay identifies the working state of the range hood through the current transformer. When the relay identifies that the range hood is in the working state through the current transformer, the relay works and cooperates with the range hood to efficiently suck and exhaust the cooking fumes, achieving the purification of the cooking fumes. When the relay identifies that the range hood is in the shutdown state through the current transformer, the relay stops running, but the smoke sensor in the smoke collecting cavity of the relay can continue to monitor the cooking fume state in the smoke collecting cavity of the relay. When the relay identifies and judges that the range hood is in the shutdown state through the current transformer and the smoke sensor detects that there is cooking fume entering the smoke collecting cavity of the relay, the control module of the relay judges that the cooking fumes in the common flue are pouring back into the smoke collecting cavity of the relay. The relay starts up and runs to discharge the cooking fumes pouring back into the smoke collecting cavity of the relay back into the common flue, preventing the cooking fumes from pouring back into the smoke collecting cavity of the range hood through the smoke collecting cavity of the relay and then being discharged to the kitchen through the suction port of the range hood, polluting the air in the kitchen. When the relay identifies and judges that the range hood is in the shutdown state through the current transformer and the smoke sensor does not detect that there is cooking fume entering the smoke collecting cavity of the relay, the relay stops running.

[0042] In the control method of the relay and the range hood of the present invention, a connecting wire is set on the relay to connect the current transformer, and the current transformer can be clamped to the live wire or neutral wire of the power supply wire of the range hood. Even if the relay and the range hood are not of the same brand, the relay can still judge the working state of the range hood through the current transformer and interact with the range hood, rejecting bundled sales and giving users the freedom of choice. In addition, in the control method of the relay and the range hood of the present invention, since a smoke sensor is provided in the smoke collecting cavity of the relay, the smoke sensor can detect the smoke state in the smoke collecting cavity of the relay. Especially when the relay judges that the range hood is in the shutdown state through the current transformer, if the smoke sensor can still detect that there is cooking fume in the smoke collecting cavity of the relay, the relay will start up and enter the anti-backflow mode to discharge the cooking fumes, avoiding the cooking fumes from pouring back into the kitchen space.

[0043] Relay and range hood control method of the present invention. The relay determines the working current of the range hood through a current transformer, and calculates the real-time power P of the range hood. If P > 5W, it is determined that the range hood is in the on state; if P ≤ 5W, it is determined that the range hood is in the off state. A fixed resistor is connected in series on the connection circuit of the current transformer. When the current transformer is clamped to the live wire or neutral wire of the power supply line of the range hood, when the range hood is running and the current passes through the power supply line of the range hood, the current transformer will detect the current of the range hood. After the current is transmitted to the fixed resistor through the connection wire of the current transformer, a voltage can be detected at the fixed resistor on the main control board of the relay. Since the resistance value of the fixed resistor is fixed, after the main control board of the relay detects the voltage at the fixed resistor, it can deduce the current flowing through the current transformer. The proportional value of the current induction between the current transformer and the range hood is fixed. According to the current of the current transformer, the main control board of the relay can convert the current into the input current of the range hood. Since the input voltage of the range hood is fixed and P = UI, the main control board of the relay can calculate the real-time power of the range hood. When the real-time power P of the range hood ≤ 5W, the exhaust fan of the range hood cannot be started, and the main control board of the relay thus determines that the range hood is in the off state. If the main control board of the relay calculates that the real-time power P of the range hood > 5W through the current transformer, the main control board of the relay determines that the range hood is in the on state. The main control board of the relay adjusts its own on / off state according to the operating state of the range hood, and adjusts its own operating power according to the smoke concentration in its smoke collecting cavity detected by the smoke sensor.

[0044] Relay and range hood control method of the present invention. When the range hood is in the on state, the relay is turned on and operates at a low power. The smoke sensor continuously detects the oil fume condition in the smoke collecting cavity of the relay. If the smoke sensor detects that the smoke concentration 0 < C ≤ C1, the relay continues to operate at a low power. If the smoke sensor detects that the smoke concentration C > C1, the relay operates at a high power. The range hood is connected to the common flue through the relay. When the relay is not operating, it is equivalent to an obstacle between the range hood and the common flue, which will cause resistance to the flow of the oil fume discharged from the range hood to the common flue and affect the exhaust effect of the range hood. Therefore, in the relay and range hood control method of the present invention, after the relay determines that the range hood is in the on state through the current transformer, the relay starts to operate at a low power. The power generated by the relay operating at a low power should not be less than the resistance it generates to the oil fume itself, so as to ensure that after the range hood is connected to the relay, when the oil fume is small, the relay does not affect the exhaust effect of the range hood, and when the oil fume is large, the relay can provide additional power to ensure the exhaust effect of the range hood.

[0045] The control method of the relay and the range hood of the present invention is provided with a smoke concentration sensor. When the range hood is operating, the oil fume discharged by the range hood will enter the smoke collection cavity of the relay. The smoke sensor detects the concentration of the oil fume entering the smoke collection cavity of the relay. When the oil fume concentration 0 < C ≤ C1, the smoke concentration in the smoke collection cavity is relatively small. The main control board of the relay judges through the oil fume concentration that the user does not operate the range hood at high power, indicating that the generation speed of the oil fume is not fast at this time. The relay operates at low power, and it can meet the exhaust requirement of the range hood without hindering the oil fume from passing through the relay and entering the common flue. When the smoke sensor in the smoke collection cavity of the relay detects that the smoke concentration C in the smoke collection cavity of the relay is > C1, it indicates that the amount of oil fume generated is relatively large, and the range hood already needs to operate at high power to exhaust the oil fume in time. At this time, the relay needs to operate at high power to supplement the exhaust power and assist the range hood to quickly discharge the generated oil fume, so as to purify the air in the use space in time.

[0046] The control method of the relay and the range hood of the present invention adjusts the operating power of the relay according to the smoke concentration detected by the smoke sensor when the range hood is operating, so that the relay can assist the range hood to quickly and efficiently discharge the oil fume, avoid the escape of the oil fume, and provide a healthy cooking environment for users.

[0047] The control method of the relay and the range hood of the present invention, when the relay operates at high power, the relay continues to identify the working state of the range hood through the mutual inductor, and at the same time the smoke sensor continues to detect the oil fume condition in the smoke collection cavity of the relay in real time:

[0048] If P > 5W and C > C1, the relay continues to operate at high power;

[0049] If P > 5W and 0 < C ≤ C1, the relay continues to operate at high power for a time T1 and then switches to low power operation;

[0050] If P ≤ 5W and C > C1, the relay continues to operate at high power;

[0051] If P ≤ 5W and 0 < C ≤ C1, the relay switches to low power operation;

[0052] If P ≤ 5W and C = 0, the relay stops operating.

[0053] When the range hood is operating and the relay is operating at high power, it indicates that the oil fume concentration is relatively high at this time. However, during the process of the range hood and the relay operating at high power, the oil fume is discharged, and the concentration of the oil fume will gradually decrease. Continuing to operate the relay at high power at this time will cause waste of the relay power.

[0054] The control method of the relay and the range hood according to the present invention, during the operation of the range hood and the relay, the smoke sensor is used to detect the smoke concentration in the smoke collection cavity of the relay in real time, and at the same time, the running power of the range hood is calculated in real time through the mutual inductor. If P > 5W and C > C1, it indicates that the range hood is in operation and a large amount of oil fume is generated. The relay needs to continue to operate at a high power to assist the range hood in sucking and discharging the oil fume in time, ensuring the purification effect of the range hood and preventing oil fume from escaping. If P > 5W and 0 < C ≤ C1, it indicates that the concentration of the oil fume entering the relay becomes smaller. At this time, it can be judged that the generation speed of the oil fume becomes slower. After the relay operates at a high power for a time T1, it switches to a low power operation. During the operation of the relay, it is also possible that the range hood is actively shut down or mis-shut down. If the relay calculates the power P of the range hood through the mutual inductor and P ≤ 5W, it indicates that the range hood is in the shutdown state. At this time, the smoke sensor will continue to detect the smoke concentration in the smoke collection cavity entering the relay. If P ≤ 5W and C > C1, it indicates that the concentration of the oil fume in the smoke collection cavity entering the relay is still relatively large, but at this time the range hood is in the shutdown state. The range hood may be faulty or mis-shut down. At this time, the relay needs to continue to operate at a high power to continue sucking the oil fume, so as to suck and discharge the oil fume when the range hood is not operating, ensuring the user's cooking environment. After the range hood is not operating and the relay operates at a high power for a period of time, if the generation speed of the oil fume becomes smaller, the smoke concentration in the smoke collection cavity entering the relay will also become smaller, and even after the oil fume stops being generated, the concentration of the oil fume in the smoke collection cavity entering the relay will even become 0. Therefore, when P ≤ 5W and 0 < C ≤ C1, it indicates that the generation speed and amount of the oil fume become smaller. At this time, the relay only needs to switch to a low power operation to meet the requirements of sucking and discharging the oil fume. When P ≤ 5W and C = 0, no oil fume is generated in the use space, and the relay can enter the shutdown state.

[0055] For the control method of the relay and the range hood according to the present invention, if P > 5W and 0 < C ≤ C1, the relay operates at power P1; if P ≤ 5W and 0 < C ≤ C1, the relay operates at power P2, and P2 > P1.

[0056] When P > 5W, it indicates that the range hood is in an operating state. At this time, if the relay does not operate, the relay will form a wind resistance between the range hood and the common flue. However, as long as the relay operates, the resistance of the relay to the oil fume will decrease. When P > 5W and 0 < C ≤ C1, the optimal operating power of the relay is such that the power provided by the relay can just overcome the resistance it generates to the passing of the oil fume; when P ≤ 5W and 0 < C ≤ C1, the range hood is not operating, and the air duct and exhaust fan of the range hood form a wind resistance for the oil fume to enter the relay. When P ≤ 5W, the power provided by the relay needs to overcome the wind resistance formed by the range hood, and the power provided by the relay also needs to provide a flow rate for the oil fume to ensure that the relay operates and purifies the oil fume when the range hood is not operating. Therefore, when P ≤ 5W and 0 < C ≤ C1, the relay operates at a low power P2, but the power P2 is greater than the operating power P1 of the relay when P > 5W and 0 < C ≤ C1.

[0057] In the control method of the relay and the range hood of the present invention, when the relay operates at a high power, the relay calculates the power of the range hood once every interval time T2 based on the current of the range hood detected by the current transformer. During the normal use of the range hood, the user will adjust the operating power of the range hood according to the generation of the oil fume. Especially in an automatically controlled range hood, the range hood itself will adjust its own operating power according to the generation of the oil fume. When the relay operates at a high power, it indicates that the conditions for starting the relay power operation are met at the moment of strong smoke generation; during the user's cooking process, opening the pot lid or stir-frying the ingredients will also be the conditions for starting the high-power operation of the relay; however, if the relay adjusts its operating power according to the range hood at any time, the operating power of the relay will change frequently. Therefore, when the relay operates at a high power, the relay calculates the operating power of the range hood once every interval time T2, judges the working state of the range hood based on the current operating power of the range hood, and then adjusts its own operating power according to the smoke concentration detected by the smoke sensor, which can not only respond to the operating state of the range hood in a timely manner, but also avoid waste of the relay power and ensure the purification effect of the range hood and the relay on the oil fume.

[0058] The control method of the relay and the range hood of the present invention is as follows. When the range hood is in the shutdown state, if the smoke sensor detects that the smoke concentration C > 0, the relay starts and enters the anti-backflow mode. When both the range hood and the relay are in the shutdown state, the air in the used space will not flow from the range hood to the smoke collection cavity of the relay. However, when both the range hood and the relay are in the shutdown state and there is cooking fume entering the smoke collection cavity of the relay and being detected by the smoke sensor, the main control board of the relay can determine that the cooking fume in the common flue has backflowed into the smoke collection cavity of the relay. If the relay does not start exhausting, the cooking fume in the common flue will pass through the smoke collection cavity of the relay, enter the smoke collection cavity of the range hood, and then be discharged from the air outlet of the range hood into the kitchen space, polluting the air in the kitchen space. Therefore, when both the range hood and the relay are in the shutdown state, as long as the smoke sensor detects that the smoke concentration C in the smoke collection cavity of the relay > 0, the relay will start, suck the air in the kitchen space, and discharge the cooking fume entering its smoke collection cavity into the common flue, avoiding the backflow of cooking fume into the kitchen space.

[0059] The control method of the relay and the range hood of the present invention is as follows. When the range hood is in the shutdown state, if the smoke sensor detects that the smoke concentration C > 0, the relay starts and operates at power P3. Power P3 corresponds to the rated speed W3 of the fan of the relay. The main control board of the relay continuously detects the actual speed W31 of the fan of the relay and calculates the difference between the actual speed W31 and the rated speed W3. If W31 - W3 > ΔW1, the relay continues to operate at power P3. If W31 - W3 ≤ ΔW1, the relay stops operating, where ΔW is the minimum threshold of the set speed difference. When there is backflow of cooking fume, the air flow is discharged into the smoke collection cavity of the relay through the common flue. However, when the relay starts, it immediately starts exhausting air in the reverse direction to the common flue. When exhausting air in the reverse direction, the relay sucks the air in the kitchen space. When there is no cooking fume in the air in the kitchen space, the air flow in the smoke collection cavity of the relay does not contain cooking fume, and the smoke sensor immediately detects that the cooking fume concentration is 0. However, after the relay stops operating, there will still be backflow of cooking fume from the common flue. Therefore, when entering the anti-backflow mode, using the detection value of the smoke sensor to control the operation of the relay has the problem of continuously starting and stopping the relay. To solve this problem, in the control method of the relay and the range hood of the present invention, the fan of the relay adopts a constant air volume operation mode. When the relay enters the anti-backflow mode, the main control board of the relay continuously monitors the actual speed of the fan of the range hood of the relay and compares the actual speed of the fan of the range hood of the relay with the rated speed of the fan of the range hood of the relay. When the cooking fume in the common flue backflows into the smoke collection cavity of the relay, the relay starts and maintains a constant air volume operation. When there is cooking fume flowing back into the smoke collection cavity of the relay from the common flue, it forms a wind resistance, which hinders the relay from exhausting air to the common flue. To maintain a constant air volume, the fan of the relay needs to increase its speed for operation. Therefore, when the relay enters the anti-backflow mode, the main control board of the relay continuously detects the speed of the fan. Only when W31 - W3 ≤ ΔW1 and the actual speed is close to the rated speed, it indicates that there is no backflow of cooking fume in the common flue or the amount of backflowed cooking fume is very small, and the relay stops operating.

[0060] For the control method of the relay and the range hood of the present invention, when the relay operates at power P3, the smoke sensor continuously detects the smoke concentration in the smoke collection cavity of the relay. If △W2≥W31 - W3>△W1, the relay continues to operate at power P3. If W31 - W3>△W2, the relay will increase the power and operate at power P4, where P4>P3, and the power P4 corresponds to the rated speed W4 of the fan of the relay. The main control board of the relay continuously detects the actual speed W41 of the fan of the relay and calculates the difference between the actual speed W41 and the rated speed W4. If W41 - W4>△W1, the relay continues to operate at power P4. If W41 - W4≤△W1, the relay will reduce the power to P3 for operation. If △W2≥W41 - W4>△W1, the relay will further increase the operating power of its fan. When the relay enters the anti-backflow mode, if the gap between the actual speed W31 of the fan of the relay and the rated speed W3 of the fan of the relay is too large, it indicates that the wind resistance in the common flue is very large. At this time, operating the fan of the relay at power P3 may not be very effective in discharging the oil fume that has backflowed into the smoke collection cavity of the relay. Therefore, when W31 - W3>△W2, the fan of the relay provides power for operation to increase the exhaust air volume and quickly discharge the oil fume that has backflowed into the smoke collection cavity of the relay into the common flue. After the fan of the relay increases the power to P4, if W41 - W4>△W1, the relay continues to operate at power P4. If △W2≥W41 - W4>△W1, the relay will further increase the operating power of its fan. If W41 - W4≤△W1, it indicates that the actual speed of the fan of the relay is close to its rated speed, and the amount of oil fume backflowing from the common flue into the smoke collection cavity of the relay is very small. The relay can reduce the power of its fan to P3 for operation.

[0061] The control method of the relay and the range hood of the present invention is as follows: after the relay enters the anti-backflow mode, when the relay runs for a time T1 and the smoke sensor detects that the smoke concentration C in the smoke collection cavity of the relay is 0, the relay stops running. After the relay enters the stopped running state from the anti-backflow mode, the smoke sensor detects the oil fume concentration every interval of time T2. When C>0, the relay starts again. When the range hood is in the shutdown state and oil fume backflows into the smoke collection cavity of the relay, the relay starts and runs at a low power, and discharges the oil fume that has backflowed into the smoke collection cavity of the relay into the common flue. When the relay runs, it will suck the air in the kitchen space. When there is no oil fume in the air in the kitchen space, there is no oil fume in the air flow in the smoke collection cavity of the relay, and the smoke sensor immediately detects that the oil fume concentration is 0. However, after the relay stops running, oil fume will still backflow from the common flue. Therefore, in other embodiments of the control method of the relay and the range hood, when the range hood stops running and there is oil fume backflow, when the relay runs for enough time T1 and its smoke sensor detects that the smoke concentration C = 0, the relay stops running to avoid waste caused by long-term operation of the relay. However, after the relay enters the stopped running state from the anti-backflow mode, the smoke sensor will detect the smoke concentration in the smoke collection cavity of the relay every interval of time T2. When the smoke concentration C>0, the relay starts again and exhausts the backflowing oil fume, which can not only avoid long-term operation of the relay but also avoid a large amount of oil fume from backflowing into the kitchen space.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for a relay and a range hood, used for the linkage between a relay and a range hood, characterized in that: The range hood is connected to the public flue through the relay, the smoke collecting chamber of the range hood is connected to the smoke collecting chamber of the relay, the smoke collecting chamber of the relay is connected to the public flue, a smoke sensor is provided in the smoke collecting chamber of the relay, the smoke sensor is used to detect the condition of the oil smoke entering the smoke collecting chamber of the relay, the relay is also provided with a mutual inductor, the mutual inductor user card is connected to the live wire or the neutral wire of the power line of the range hood, the mutual inductor is used to detect the current of the range hood and transmit the detected current to the main control board of the relay, the control method of the relay and the range hood includes the following steps: The relay is powered on, and the mutual inductor and the smoke sensor are connected to the circuit; The relay identifies the working status of the range hood through the mutual inductor, and the smoke sensor detects the smoke status in the smoke collecting chamber of the relay in real time: If the range hood is in the on state, the relay is turned on; If the range hood is in the off state, and the smoke sensor does not detect that there is oil smoke in the smoke collecting chamber of the relay, the relay continues to remain in the off state; If the range hood is in the off state, and the smoke sensor detects that there is oil smoke in the smoke collecting chamber of the relay, the relay is turned on and operated.

2. The control method of the relay and the range hood according to claim 1, characterized in that: The relay determines the working current of the range hood through the mutual inductor and calculates the real-time power P of the range hood. If P>5W, the range hood is determined to be in the on state; if P≤5W, the range hood is determined to be in the off state.

3. The control method of the relay and the range hood according to claim 2, characterized in that: The range hood is in the on state, the relay is on and runs at low power, the smoke sensor detects the oil smoke condition in the smoke collecting chamber of the relay in real time, if the smoke sensor detects the smoke concentration 0<C≤C1, the relay continues to run at low power, if the smoke sensor detects the smoke concentration C>C1, the relay runs at high power.

4. The control method of the relay and the range hood according to claim 3, characterized in that: When the relay is running at high power, the relay continues to identify the working state of the range hood through the mutual inductor, and the smoke sensor continues to detect the oil smoke condition in the smoke collecting chamber of the relay in real time: If P>5W and C>C1, the relay continues to operate at high power; If P>5W and 0<C≤C1, the relay continues to operate at high power for T1 and then switches to low power operation; If P≤5W and C>C1, the relay continues to operate at high power; If P≤5W and 0<C≤C1, the relay switches to low power operation; If P≤5W and C=0, the relay stops running.

5. The control method of the relay and the range hood according to claim 4, characterized in that: If P>5W and 0<C≤C1, the relay operates at power P1; if P≤5W and 0<C≤C1, the relay operates at power P2, P2>P1.

6. The control method of the relay and the range hood according to claim 4, characterized in that: When the relay operates at high power, the relay calculates the power of the range hood once every time interval T2 through the current of the range hood detected by the mutual inductor.

7. The control method of the relay and the range hood according to claim 1, characterized in that: When the range hood is in the off state, if the smoke sensor detects that the smoke concentration C>0, the relay is started and enters the anti-backflow mode.

8. The control method of the relay and the range hood according to claim 7, characterized in that: When the range hood is in the off state, if the smoke sensor detects that the smoke concentration C>0, the relay starts and runs at power P3, and the power P3 corresponds to the rated speed W3 of the relay's fan. The main control board of the relay detects the actual speed W31 of the relay's fan in real time, and calculates the difference between the actual speed W31 and the rated speed W3. If W31-W3>△W1, the relay continues to run at power P3. If W31-W3≤△W1, the relay stops running, where △W is the set minimum threshold of the speed difference.

9. The control method of the relay and the range hood according to claim 8, characterized in that: When the relay operates at power P3, the smoke sensor detects the smoke concentration in the smoke collecting chamber of the relay in real time. If △W2≥W31-W3>△W1, the relay continues to operate at power P3. If W31-W3>△W2, the relay will increase the power and operate at power P4, wherein P4>P3, and power P4 corresponds to the rated speed W4 of the fan of the relay. The main control board of the relay detects the actual speed W41 of the fan of the relay in real time, and calculates the difference between the actual speed W41 and the rated speed W4. If W41-W4>△W1, the relay continues to operate at power P4. If W41-W4≤△W1, the relay will reduce the power to P3. If △W2≥W41-W4>△W1, the relay will further increase the operating power of its fan.

10. The control method of the relay and the range hood according to claim 7, characterized in that: After the relay enters the anti-backflow mode, when the relay runs for T1 and the smoke sensor detects that the smoke concentration C=0 in the smoke collecting chamber of the relay, the relay stops running. After the relay enters the stopped running state from the anti-backflow mode, the smoke sensor detects the oil smoke concentration once every interval T2. When C>0, the relay starts again.

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