Central oil fume suction, exhaust and purification system and control method

Abstract

The present invention provides a central oil fume extraction and purification system and control method, comprising: a terminal for transmitting a first operating state of a terminal fan to a corresponding power distribution valve; a valve control switch for obtaining a second operating state of the power distribution valve input by a user and transmitting the second operating state to the corresponding power distribution valve; and a power distribution valve for distributing exhaust power according to the first operating state and the second operating state. When the first operating state indicates that the terminal fan is on, the control host and the terminal fan are coordinated to perform exhaust; when the second operating state indicates that the power distribution valve is on, the control host performs exhaust alone. By jointly controlling the power distribution valve through the terminal fan and the valve control switch, the power distribution valve can distribute the exhaust power of the central oil fume extraction and purification system according to the user's voice preference, thereby reducing operating noise and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of central oil fume suction and exhaust, and in particular to a central oil fume suction and exhaust purification system and a control method. Background Art

[0002] A central oil fume extraction and purification system consists of a main unit, power distribution valves, and a terminal unit. The terminal unit includes an integrated stove and range hood, and also contains a fan. The main unit is installed at the exit of the public flue on the roof of a residential building, while the power distribution valves and terminal units are installed at the exit of each household's flue. The central oil fume extraction and purification system uses the terminal unit to exhaust fumes from multiple kitchens and the main unit to provide auxiliary exhaust for oil fumes within the public flue.

[0003] Although the existing central exhaust and fume purification system has high exhaust efficiency, the main unit fan and terminal unit fan run at the same time, which makes a lot of noise. Users cannot adjust the central exhaust and fume purification system according to their sound preferences, resulting in a poor user experience. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a central oil fume suction and exhaust purification system and control method, which can accurately adjust the working fan according to the user's actual sound preference, thereby reducing operating noise and improving the user's experience.

[0005] In the first aspect, an embodiment of the present invention provides a central oil fume purification system, comprising: a main unit, at least one power distribution valve, and a terminal and a valve control switch uniquely corresponding to each power distribution valve; the power distribution valve is communicatively connected to the main unit, and is communicatively connected to the corresponding terminal and the valve control switch; a terminal fan is provided on the terminal; the terminal is used to send a first operating state of the terminal fan to the corresponding power distribution valve; the valve control switch is used to obtain a second operating state of the power distribution valve input by a user, and send the second operating state to the corresponding power distribution valve; the power distribution valve is used to distribute exhaust power according to the first operating state and the second operating state; wherein, when the first operating state indicates that the terminal fan is on, the main unit and the terminal fan are controlled to perform exhaust in conjunction; when the second operating state indicates that the power distribution valve is on, the main unit is controlled to perform exhaust alone.

[0006] Furthermore, the power distribution valve includes a current detection circuit; the terminal is connected to the power supply through the current detection circuit; the current detection circuit is used to generate a current signal when the first operating state indicates that the terminal fan is on and current passes through the current detection circuit; the power distribution valve is also used to open when the current detection circuit generates a current signal, obtain the preset host operating frequency, and send the preset host operating frequency to the host, so that the host can exhaust air in conjunction with the terminal fan according to the preset host operating frequency; wherein the preset host operating frequency is the third operating frequency.

[0007] Furthermore, the valve control switch includes a switch module and a gear control module; the switch module and the gear control module are respectively communicated with the power distribution valve; the valve control switch is also used to determine that the second operating state of the power distribution valve is on when the switch module is on, and at the same time obtain the gear information input by the user through the gear control module, and send the second operating state and the gear information to the power distribution valve; when the switch module is closed, determine that the second operating state of the power distribution valve is closed, and send the second operating state to the power distribution valve; the power distribution valve is also used to generate a corresponding host operating frequency according to the gear information when the second operating state indicates that the power distribution valve is on, and send the host operating frequency to the host, so that the host can exhaust air separately according to the host operating frequency; wherein, when the gear information is gear 1, the host operating frequency is the first operating frequency; when the gear information is gear 2, the host operating frequency is the second operating frequency; when the gear information is gear 3, the host operating frequency is the third operating frequency.

[0008] Furthermore, the power distribution valve also includes a wind pressure sensor; the wind pressure sensor is communicatively connected to the terminal; the wind pressure sensor is used to obtain the wind pressure of the terminal when the second operating state indicates that the power distribution valve is open; if the wind pressure is negative, the host is working normally; if the wind pressure is not negative, the host is working abnormally; the power distribution valve is also used to send an alarm signal to the terminal when the host is working abnormally.

[0009] Furthermore, the terminal also includes a forced start module; the forced start module is connected to the terminal fan; the forced start module is used to start the terminal fan when an alarm signal is received.

[0010] Furthermore, the terminal also includes an air duct; the air duct is connected to the power distribution valve.

[0011] Furthermore, the system also includes a common flue and a mounting base, wherein each power distribution valve is connected to the common flue; and the main engine is arranged on the common flue through the mounting base.

[0012] In the second aspect, an embodiment of the present invention provides a control method, which is applied to the above-mentioned central oil fume purification system; the method includes: the terminal sends the first operating state of the terminal fan to the corresponding power distribution valve; the valve control switch obtains the second operating state of the power distribution valve input by the user, and sends the second operating state to the corresponding power distribution valve; the power distribution valve distributes exhaust power according to the first operating state and the second operating state; wherein, when the first operating state indicates that the terminal fan is on, the control host and the terminal fan are linked to perform exhaust; when the second operating state indicates that the power distribution valve is on, the control host performs exhaust alone.

[0013] In a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor implements the above-mentioned method when executing the computer program.

[0014] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the program code enables the processor to execute the method described above.

[0015] An embodiment of the present invention provides a central oil fume extraction and purification system and control method, comprising: a main unit, at least one power distribution valve, and a terminal and valve control switch uniquely corresponding to each power distribution valve; the power distribution valve is communicatively connected to the main unit and to the corresponding terminal and valve control; the terminal is provided with a terminal fan; the terminal is configured to transmit a first operating state of the terminal fan to the corresponding power distribution valve; the valve control switch is configured to obtain a second operating state of the power distribution valve input by a user and transmit the second operating state to the corresponding power distribution valve; the power distribution valve is configured to distribute exhaust power according to the first operating state and the second operating state; wherein, when the first operating state indicates that the terminal fan is on, the main unit and the terminal fan are controlled to perform exhaust in conjunction; when the second operating state indicates that the power distribution valve is on, the main unit is controlled to perform exhaust alone. In this method, the method of jointly controlling the power distribution valve through the terminal fan and the valve control switch enables the power distribution valve to distribute the exhaust power of the central oil fume extraction and purification system according to the user's actual sound preference, thereby reducing operating noise and improving the user experience.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1Schematic diagram of a central oil fume suction and exhaust purification system provided in Example 1 of the present invention;

[0020] Figure 2 A schematic diagram of a valve control switch provided in Example 1 of the present invention;

[0021] Figure 3 Schematic diagram of the power distribution valve, valve control switch and terminal provided in the first embodiment of the present invention;

[0022] Figure 4 Schematic diagram of another power distribution valve, valve control switch and terminal provided in the first embodiment of the present invention;

[0023] Figure 5 This is a flow chart of the control method provided in Example 2 of the present invention.

[0024] Icons: 1- host; 2- power distribution valve; 21- current detection circuit; 22- wind pressure sensor; 3- terminal; 31- forced start module; 32- air duct; 4- valve control switch; 41- switch module; 42- gear control module; 5- terminal fan; 6- public flue; 7- installation base. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Centralized range hood extraction and purification systems typically consist of a main unit, power distribution valves, and terminals. Terminals are generally divided into powered (with internal fans) and unpowered (without internal fans). Powered systems are called distributed systems, while unpowered systems are called centralized systems. While distributed systems improve the exhaust efficiency of the entire common flue, the noise generated by the terminals is no different from that of traditional single range hoods, a persistent problem for users. While centralized systems significantly reduce terminal noise, providing a positive user experience, their single-powered approach carries the risk that if the main unit fails, all terminals will be unable to exhaust.

[0027] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0028] Example 1:

[0029] Figure 1 This is a schematic diagram of the central oil fume suction and exhaust purification system provided in Example 1 of the present invention.

[0030] Reference Figure 1 The central oil fume purification system includes: a main unit 1, at least one power distribution valve 2, and a terminal 3 and a valve control switch 4 uniquely corresponding to each power distribution valve 2; the power distribution valve 2 is communicatively connected to the main unit 1, and is communicatively connected to the corresponding terminal 3 and valve control switch 4; a terminal fan 5 is provided on the terminal 3.

[0031] Here, the terminal can be any brand or model of range hood or integrated stove, wherein the range hood and integrated stove include a terminal fan. The host is provided with a host fan.

[0032] The power distribution valves and the host computer have two-way communication. Each power distribution valve contains its location information, which includes floor information and user information. The host computer contains the total floor information.

[0033] Furthermore, the system also includes a common flue 6 and a mounting base 7, wherein each power distribution valve 2 is connected to the common flue 6; and the main unit 1 is set on the common flue through the mounting base 7.

[0034] Here, the host exhausts smoke to each terminal through a public flue.

[0035] The terminal is used to send the first operating state of the terminal fan to the corresponding power distribution valve.

[0036] Here, the first operating state is that the terminal fan is turned on or the terminal fan is turned off.

[0037] Furthermore, the terminal 3 further includes an air duct 32 ; the air duct 32 is connected to the power distribution valve 2 .

[0038] Here, the terminal absorbs and exhausts the oil smoke, which then enters the public flue through the air duct. The host assists in exhausting the oil smoke inside the public flue through the air duct.

[0039] The valve control switch is used to obtain the second operating state of the power distribution valve input by the user and send the second operating state to the corresponding power distribution valve.

[0040] Here, refer to Figure 2 The valve control switch is preferably provided with 4 buttons, including a switch button, gear 1, gear 2 and gear 3. Among them, the terminal air volume corresponding to the gear can be set according to actual conditions.

[0041] In actual operation, it can be set to level 1, which corresponds to the terminal air volume reaching 400m3 when the terminal fan is not turned on. 3 / h; Level 2 corresponds to the terminal air volume reaching 500m3 when the terminal fan is not turned on 3 / h; Level 3 corresponds to the terminal air volume reaching 600m3 when the terminal fan is not turned on 3 / h.

[0042] The power distribution valve is used to distribute exhaust power according to the first operating state and the second operating state; when the first operating state indicates that the terminal fan is on, the control host and the terminal fan are linked to perform exhaust; when the second operating state indicates that the power distribution valve is open, the control host performs exhaust alone.

[0043] Here, the second operating state is that the power distribution valve is open or the power distribution valve is closed.

[0044] Specifically, when users require efficient smoke exhaust and have a high noise tolerance, they open the power distribution valve by turning on the terminal fan, allowing the valve to control the terminal fan and the main unit fan for coordinated exhaust. When users have a low noise tolerance, they open the valve control switch to open the power distribution valve, allowing the valve to control the main unit fan alone for silent exhaust.

[0045] In one embodiment, reference Figure 3 The power distribution valve 2 includes a current detection circuit 21; the terminal 3 is connected to the power supply through the current detection circuit 21.

[0046] The current detection circuit is used to generate a current signal when the first operating state indicates that the fan of the terminal is turned on and current passes through the current detection circuit.

[0047] Here, when the user turns on the terminal's fan, the power supply generates current. The power distribution valve is located between the power supply and the terminal. Therefore, when the power distribution valve's current detection circuit detects current, the terminal's fan is on. When the power distribution valve's current detection circuit detects no current, the terminal's fan is off.

[0048] The power distribution valve is also used to open when the current detection circuit generates a current signal, obtain the preset host operating frequency, and send the preset host operating frequency to the host, so that the host can exhaust air in conjunction with the terminal fan according to the preset host operating frequency; wherein the preset host operating frequency is the third operating frequency.

[0049] Here, when the terminal fan is on, regardless of the terminal fan and valve control switch positions, the power distribution valve will report the demand to the host computer as if the valve control switch is in position 3. When the valve control switch is in position 3, the corresponding host computer operating frequency is the third operating frequency F3.

[0050] Specifically, when the terminal fan is turned on, the actual terminal air volume is the sum of the current terminal fan air volume and the terminal air volume when the host operates at the third operating frequency F3.

[0051] If only one terminal fan is currently on, the actual operating frequency of the main engine is the third operating frequency F3. If multiple terminal fans are currently on, the actual operating frequency of the main engine is determined based on all power distribution valves. In this case, the actual operating frequency of the main engine is greater than the third operating frequency F3.

[0052] In one embodiment, reference Figure 3 The valve control switch 4 includes a switch module 41 and a gear control module 42; the switch module 41 and the gear control module 42 are respectively connected to the power distribution valve for communication.

[0053] In actual operation, refer to Figure 2 The switch module can be a switch button, and the gear control module can be a gear button.

[0054] The valve control switch is also used to determine that the second operating state of the power distribution valve is on when the switch module is on, and at the same time obtain the gear information input by the user through the gear control module, and send the second operating state and gear information to the power distribution valve; when the switch module is closed, determine that the second operating state of the power distribution valve is off, and send the second operating state to the power distribution valve.

[0055] Among them, when the gear information is gear 1, the host operating frequency is the first operating frequency; when the gear information is gear 2, the host operating frequency is the second operating frequency; when the gear information is gear 3, the host operating frequency is the third operating frequency.

[0056] The power distribution valve is also used to generate a corresponding host operating frequency according to the gear information when the second operating state indicates that the power distribution valve is open, and send the host operating frequency to the host so that the host can exhaust air separately according to the host operating frequency.

[0057] Here, when the gear information is gear 1, the terminal air volume is 400m 3 / h, the host operating frequency is the first operating frequency F1; when the gear information is gear 2, the terminal air volume is 500m 3 / h, the host operating frequency is the second operating frequency F2; when the gear information is gear 3, the terminal air volume is 600m 3 / h, the main engine operating frequency is the third operating frequency F3. The main engine operating frequency here refers to the main engine operating frequency when only one power distribution valve is operating in the central oil fume purification system. When multiple power distribution valves are operating simultaneously in the central oil fume purification system, the actual main engine operating frequency is the sum of the main engine operating frequencies corresponding to all power distribution valves.

[0058] In one embodiment, reference Figure 4The power distribution valve 2 further includes a wind pressure sensor 22, which is in communication with the terminal 3. The terminal 3 further includes a forced start module 31, which is in communication with the terminal fan 5.

[0059] Here, the power distribution valve may or may not include a wind pressure sensor, and the terminal may or may not include a forced start module.

[0060] Specifically, assuming the power distribution valve does not include an air pressure sensor and the terminal does not include a forced start module, when the user turns on the valve control switch, if the main unit fan is not operating normally, the terminal will not be able to extract the fume, and a large amount of fume will be generated in the user's kitchen. In this case, the user can turn on the terminal fan to extract the fume.

[0061] The wind pressure sensor is used to obtain the wind pressure of the terminal when the power distribution valve is open in the second operating state; if the wind pressure is negative, the host is working normally; if the wind pressure is not negative, the host is working abnormally.

[0062] Here, when the terminal air pressure is negative, the main unit fan operates normally. When the terminal air pressure is positive, other users on the same floor are using the main unit fan, resulting in low smoke exhaust efficiency. Therefore, the terminal fan needs to be turned on to improve smoke exhaust efficiency. When the terminal air pressure is zero, the main unit fan may be malfunctioning and needs to be turned on for smoke exhaust.

[0063] The power distribution valve is also used to send an alarm signal to the terminal when the host machine is working abnormally.

[0064] The forced start module is used to start the terminal fan when an alarm signal is received.

[0065] Here, the terminal that can start the terminal fan according to the alarm signal is a fixed model terminal including a forced start module.

[0066] An embodiment of the present invention provides a central oil fume extraction and purification system, comprising: a main unit, at least one power distribution valve, and a terminal and valve control switch uniquely corresponding to each power distribution valve; the power distribution valve is communicatively connected to the main unit and is communicatively connected to the corresponding terminal and valve control; a terminal fan is provided on the terminal; the terminal is configured to transmit a first operating state of the terminal fan to the corresponding power distribution valve; the valve control switch is configured to obtain a second operating state of the power distribution valve input by a user and transmit the second operating state to the corresponding power distribution valve; the power distribution valve is configured to distribute exhaust power according to the first operating state and the second operating state; wherein, when the first operating state indicates that the terminal fan is on, the main unit and the terminal fan are controlled to perform exhaust in conjunction; when the second operating state indicates that the power distribution valve is on, the main unit is controlled to perform exhaust alone. In this manner, the method of jointly controlling the power distribution valve through the terminal fan and the valve control switch allows the power distribution valve to select silent exhaust or high-efficiency exhaust according to the user's actual preference, thereby reducing operating noise and improving the user's experience.

[0067] Example 2:

[0068] Figure 5 This is a flow chart of the control method provided in Example 2 of the present invention.

[0069] Reference Figure 5 , control methods include:

[0070] In step S101 , the terminal sends the first operating state of the terminal fan to the corresponding power distribution valve.

[0071] In step S102 , the valve control switch obtains the second operating state of the power distribution valve input by the user, and sends the second operating state to the corresponding power distribution valve.

[0072] In step S103, the power distribution valve distributes exhaust power according to the first operating state and the second operating state; when the first operating state indicates that the terminal fan is on, the control host and the terminal fan are linked to perform exhaust; when the second operating state indicates that the power distribution valve is on, the control host performs exhaust alone.

[0073] An embodiment of the present invention provides a control method, comprising: a host, at least one power distribution valve, and a terminal and valve control switch uniquely corresponding to each power distribution valve; the power distribution valve is communicatively connected to the host and to the corresponding terminal and valve control; a terminal fan is provided on the terminal; the terminal is configured to transmit a first operating state of the terminal fan to the corresponding power distribution valve; the valve control switch is configured to obtain a second operating state of the power distribution valve input by a user and transmit the second operating state to the corresponding power distribution valve; the power distribution valve is configured to distribute exhaust power based on the first operating state and the second operating state; wherein, when the first operating state indicates that the terminal fan is on, the host and the terminal fan are controlled to perform exhaust in conjunction; when the second operating state indicates that the power distribution valve is on, the host is controlled to perform exhaust alone. In this method, the method of jointly controlling the power distribution valve through the terminal fan and the valve control switch enables the power distribution valve to distribute exhaust power of the central oil fume purification system according to the user's actual sound preference, thereby reducing operating noise and improving the user experience.

[0074] An embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the control method provided in the above embodiment are implemented.

[0075] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. The computer-readable medium stores the computer program, and when the computer program is executed by a processor, the steps of the control method of the above embodiment are executed.

[0076] The computer program product provided in the embodiments of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the previous method embodiments. For specific implementation, please refer to the method embodiments and will not be repeated here.

[0077] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0078] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0079] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0080] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0081] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A central oil fume extraction and purification system, characterized in that: include: A host, at least one power distribution valve, and a terminal and a valve control switch uniquely corresponding to each power distribution valve; The power distribution valve is in communication with the host, and is in communication with the corresponding terminal and the valve control switch; the terminal is provided with a terminal fan; The terminal is used to send the first operating state of the fan of the terminal to the corresponding power distribution valve; The valve control switch is configured to obtain a second operating state of the power distribution valve input by a user and send the second operating state to the corresponding power distribution valve; The power distribution valve is used to distribute exhaust power according to the first operating state and the second operating state; when the first operating state indicates that the terminal fan is turned on, the host and the terminal fan are controlled to exhaust in conjunction; when the second operating state indicates that the power distribution valve is turned on, the host is controlled to exhaust alone; The valve control switch includes a switch module and a gear control module; the switch module and the gear control module are respectively connected to the power distribution valve for communication; The valve control switch is further configured to, when the switch module is on, determine that the second operating state of the power distribution valve is on, simultaneously obtain gear information input by the user through the gear control module, and send the second operating state and the gear information to the power distribution valve; when the switch module is off, determine that the second operating state of the power distribution valve is off, and send the second operating state to the power distribution valve; The power distribution valve is further configured to generate a corresponding host operating frequency according to the gear information when the second operating state indicates that the power distribution valve is open, and send the host operating frequency to the host, so that the host performs exhaust separately according to the host operating frequency; Among them, when the gear information is gear 1, the host operating frequency is the first operating frequency; when the gear information is gear 2, the host operating frequency is the second operating frequency; when the gear information is gear 3, the host operating frequency is the third operating frequency.

2. The central oil fume suction and exhaust purification system according to claim 1 is characterized in that: The power distribution valve includes a current detection circuit; the terminal is connected to the power supply through the current detection circuit; The current detection circuit is configured to generate a current signal when the first operating state indicates that the fan of the terminal is turned on and current flows through the current detection circuit; The power distribution valve is also used to open when the current detection circuit generates the current signal, obtain the preset host operating frequency, and send the preset host operating frequency to the host, so that the host can exhaust air in conjunction with the terminal fan according to the preset host operating frequency; wherein the preset host operating frequency is the third operating frequency.

3. The central oil fume suction and exhaust purification system according to claim 1 is characterized in that: The power distribution valve further includes a wind pressure sensor; the wind pressure sensor is communicatively connected to the terminal; The wind pressure sensor is used to obtain the wind pressure of the terminal when the second operating state indicates that the power distribution valve is open; if the wind pressure is negative, the host is operating normally; If the wind pressure is not negative, the host is working abnormally; The power distribution valve is also used to send an alarm signal to the terminal when the host machine works abnormally.

4. The central oil fume suction and exhaust purification system according to claim 3 is characterized in that: The terminal further includes a forced start module; the forced start module is connected to the terminal fan; The forced start module is used to start the terminal fan when the alarm signal is received.

5. The central oil fume suction and exhaust purification system according to claim 1 is characterized in that: The terminal further includes an air duct; the air duct is connected to the power distribution valve.

6. The central oil fume suction and exhaust purification system according to claim 1 is characterized in that: The system further comprises a common flue and a mounting base, wherein each of the power distribution valves is connected to the common flue; and the main unit is arranged on the common flue via the mounting base.

7. A control method, characterized in that: Applicable to the central oil fume extraction and purification system according to any one of claims 1 to 6; the method comprises: The terminal sends the first operating state of the terminal fan to the corresponding power distribution valve; The valve control switch acquires a second operating state of the power distribution valve input by a user, and sends the second operating state to the corresponding power distribution valve; The power distribution valve distributes exhaust power according to the first operating state and the second operating state; when the first operating state indicates that the terminal fan is on, the host and the terminal fan are controlled to exhaust in conjunction; when the second operating state indicates that the power distribution valve is open, the host is controlled to exhaust alone; The valve control switch includes a switch module and a gear control module; the switch module and the gear control module are respectively connected to the power distribution valve for communication; When the switch module is turned on, the valve control switch determines that the second operating state of the power distribution valve is on, and simultaneously obtains the gear information input by the user through the gear control module, and sends the second operating state and the gear information to the power distribution valve; when the switch module is turned off, the valve control switch determines that the second operating state of the power distribution valve is off, and sends the second operating state to the power distribution valve; When the second operating state indicates that the power distribution valve is open, the power distribution valve generates a corresponding host operating frequency according to the gear information, and sends the host operating frequency to the host, so that the host performs exhaust separately according to the host operating frequency; Among them, when the gear information is gear 1, the host operating frequency is the first operating frequency; when the gear information is gear 2, the host operating frequency is the second operating frequency; when the gear information is gear 3, the host operating frequency is the third operating frequency.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the method according to claim 7 is implemented.

9. A computer-readable medium, characterized in that The computer-readable medium stores program code, and when the processor executes the program code, the program code is used to implement the method according to claim 7.

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