Central oil fume purification system and air volume control method thereof

Abstract

The application provides a central oil fume purification system and an air volume control method thereof, and relates to the technical field of range hood. The central oil fume purification system comprises a central control unit, a main fan installed in a public flue and a range hood installed on each floor. Each range hood is communicated with the public flue through a respective connecting pipeline, and an air volume adjusting element is arranged on each connecting pipeline. The range hood comprises a self-defined module, and the self-defined module is used for setting a first air volume. The air volume adjusting element comprises a setting unit, and the setting unit is used for setting a second air volume by a user. When the running state of the main fan is an abnormal state and the actual air volume flowing through the air volume adjusting element is greater than the second air volume, the air volume is adjusted through the air volume adjusting element until the actual air volume of the range hood is within the set second air volume value range. The application can solve the problem of uneven air volume distribution of different floors.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of range hood technology, and in particular to a central oil fume purification system and a wind volume control method thereof. BACKGROUND

[0002] With the development of economy and the continuous improvement of people's living conditions, the problem of smoke exhaust in residential buildings is increasingly concerned, and the smoke exhaust system is also diversified. The traditional power source of smoke exhaust is mainly the range hood. At present, the central smoke exhaust purification system based on roof fan is usually used in high-rise buildings, which includes a public flue, and a range hood is arranged in each kitchen on each floor. The range hood is connected with the public flue through a connecting pipe. In different smoke exhaust pipes, sometimes many range hoods work at the same time, and the pressure of the public flue is different at different time periods. In order to ensure good smoke exhaust effect, stable wind volume is required under different smoke exhaust pipe pressures. When the users use the same power range hood, the smoke exhaust volume of high-rise residential buildings is relatively large, and the smoke exhaust volume of the bottom floor is relatively small. This situation is particularly evident during the peak period of range hood use.

[0003] At present, the range hoods on each floor generally adjust the wind volume of each floor through an electric valve. By controlling the opening angle of the electric valve of each user's home, the wind volume of different floors is evenly distributed in cooperation with the roof fan. However, the control method of the existing electric valve is complex, which is related to the structural parameters of each component of the central purification system, such as the range hood, the electric valve, the public flue, etc. This makes the wind volume control more complex, resulting in uneven distribution of wind volume of each floor, and the actual application effect is not ideal.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The first purpose of the present application is to provide a central oil fume purification system, which is simple, stable and reliable in structure, can evenly distribute the wind volume of different floors, and can overcome the above problems or at least partially solve the above technical problems.

[0006] The second purpose of the present application is to provide a wind volume control method of a central oil fume purification system, which is simple, reliable and stable, can evenly distribute the wind volume of different floors, and can overcome the above problems or at least partially solve the above technical problems.

[0007] In order to achieve the above purposes, the present application adopts the following technical solutions:

[0008] One of the purposes of the present application is to provide a central oil fume purification system, which comprises a central control unit, a main fan installed in a public flue, and a range hood installed on each floor. Each range hood is communicated with the public flue through a respective connecting pipe, and a wind volume adjusting element is arranged on each connecting pipe.

[0009] The range hood comprises a self-defining module for setting a first air volume, the range hood being adapted to obtain preset working parameters of the range hood according to the first air volume; the range hood further comprises a sending module for sending actual working parameters of the range hood to a central control unit;

[0010] The central control unit comprises an obtaining module, a receiving module and a processing module; the obtaining module is used for obtaining preset working parameter information of each range hood; the receiving module is used for receiving actual working parameter information sent by each range hood; the processing module is used for comparing the preset working parameters and the actual working parameters of each range hood respectively, and generating a judgment result, and sending the judgment result to a main fan;

[0011] The main fan is used for adjusting the rotating speed of the main fan according to the judgment result, so that the actual working parameters of at least part of the range hoods are adapted to the preset working parameters, and further so that the actual air volumes of at least part of the range hoods are all within a set first air volume value range;

[0012] The air volume adjusting element comprises a setting unit for allowing a user to set a second air volume, the second air volume being greater than the first air volume; the air volume adjusting element is used for adjusting the air volume through the air volume adjusting element when the operating state of the main fan is an abnormal state and the actual air volume flowing through the air volume adjusting element is greater than the second air volume, until the actual air volume of each range hood is within a set second air volume value range.

[0013] In a possible implementation, the range hood comprises a brushless direct current motor, which is adapted to output a constant air volume.

[0014] In a possible implementation, the air volume adjusting element comprises a self-acting adjusting valve, which is adapted to adaptively adjust the opening angle of the adjusting valve.

[0015] In a possible implementation, the operating state of the main fan being an abnormal state comprises at least one of the actual rotating speed of the main fan being outside a rated rotating speed, the actual current of the main fan being outside a rated current, the actual voltage of the main fan being outside a rated voltage or the rated power of the main fan being outside a rated power.

[0016] In a possible implementation, the preset working parameters of the range hood comprise at least one of a preset working current, a preset working rotating speed or a preset working voltage;

[0017] The actual working parameters comprise at least one of an actual working current, an actual working rotating speed or an actual working voltage.

[0018] In a possible implementation, the first air volume includes a first air volume upper limit value and a first air volume lower limit value, the second air volume includes a second air volume upper limit value and a second air volume lower limit value, the second air volume upper limit value is greater than the first air volume upper limit value, and the second air volume lower limit value is greater than the first air volume lower limit value.

[0019] In a possible implementation, the cooperation between the central control unit and each of the range hood is a wireless communication connection.

[0020] In a possible implementation, the cooperation between the central control unit and the main air blower is a wireless communication connection.

[0021] The second purpose of the present application is to provide an air volume control method of a central oil fume purification system, the central oil fume purification system including a central control unit, a main air blower installed in a public flue, and range hoods installed on each floor, each of the range hoods being in communication with the public flue through a respective connecting pipeline, and each of the connecting pipelines being provided with an air volume adjusting element;

[0022] The air volume control method of the central oil fume purification system includes:

[0023] A first air volume is set in each of the range hoods, and the range hood is adapted to obtain a preset working parameter of the range hood according to the first air volume;

[0024] The preset working parameter of each of the range hoods is set in the central control unit, the range hood feeds back an actual working parameter to the central control unit, the central control unit compares the preset working parameter with the actual working parameter of each of the range hoods respectively, generates a judgment result, and sends the judgment result to the main air blower;

[0025] According to the judgment result of the central control unit, the main air blower adjusts the rotating speed so that the actual working parameter of at least part of the range hoods is adapted to the preset working parameter, and then the actual air volume of at least part of the range hoods is within a set first air volume value range;

[0026] A second air volume is set in the air volume adjusting element, the second air volume is greater than the first air volume, when the operating state of the main air blower is an abnormal state and the actual air volume flowing through the air volume adjusting element is greater than the second air volume, the air volume adjusting element adjusts the air volume so that the actual air volume of each of the range hoods is within a set second air volume value range.

[0027] In a possible implementation, the air volume control method of the central oil fume purification system includes the following steps:

[0028] The preset working parameter of each of the range hoods is set in the central control unit;

[0029] The oil fume exhauster feeds the actual working parameter value to the central control unit when it is turned on.

[0030] The maximum actual working parameter value in all oil fume exhausters is obtained.

[0031] The relationship between the maximum actual working parameter value and the preset working parameter is determined. If the maximum actual working parameter value is greater than the upper limit of the preset parameter, the main fan is turned on, the rotation speed of the main fan is increased, and it is determined whether the rotation speed of the main fan is higher than the highest rotation speed of the main fan. If not, the maximum actual working parameter value in all oil fume exhausters is continuously obtained. If yes, the main fan is not adjusted.

[0032] If the maximum actual working parameter value is less than the upper limit of the preset parameter, it is determined whether the main fan is working. If not, the maximum actual working parameter value in all oil fume exhausters is continuously obtained. If yes, the rotation speed of the main fan is decreased, and it is determined whether the rotation speed of the main fan is lower than the lowest rotation speed of the main fan. If not, the maximum actual working parameter value in all oil fume exhausters is continuously obtained. If yes, the main fan is turned off.

[0033] In a possible implementation, when it is determined that the rotation speed of the main fan is higher than the highest rotation speed of the main fan, the main fan is not adjusted, and the air volume is adjusted through the air volume adjusting element, so that the actual air volume of each oil fume exhauster is within the set second air volume value range.

[0034] In a possible implementation, the first air volume includes a first air volume upper limit value and a first air volume lower limit value, the second air volume includes a second air volume upper limit value and a second air volume lower limit value, the second air volume upper limit value is greater than the first air volume upper limit value, and the second air volume lower limit value is greater than the first air volume lower limit value.

[0035] In a possible implementation, the preset working parameter includes at least one of a preset working current, a preset working rotation speed or a preset working voltage.

[0036] The actual working parameter includes at least one of an actual working current, an actual working rotation speed or an actual working voltage.

[0037] In a possible implementation, the air volume adjusting element includes a self-adjusting valve, which is adapted to self-adaptively adjust the opening angle of the valve.

[0038] In a possible implementation, the operating state of the main fan in the abnormal state includes at least one of that the actual rotation speed of the main fan is outside the rated rotation speed, the actual current of the main fan is outside the rated current, the actual voltage of the main fan is outside the rated voltage or the rated power of the main fan is outside the rated power.

[0039] Compared with the prior art, the technical scheme provided by the application can achieve the following beneficial effects:

[0040] The central oil fume purification system and the air volume adjusting method thereof provided by the application can alleviate the problem of uneven air volume distribution of each floor, and can ensure that the air volume of each floor remains balanced and air volume is self-adaptive. Moreover, the user can operate more conveniently and simply, and no additional sensor is needed. The algorithm is simpler than the method of simply controlling the electric valve, and is reliable and stable, which can improve the user experience effect.

[0041] It should be understood that the foregoing general description and the following detailed description are only examples and are not limiting the application. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the application, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] Figure 1 The structural schematic diagram of the central oil fume purification system provided by an exemplary embodiment of the application is shown in the figure.

[0044] Figure 2 The control diagram of the central oil fume purification system provided by an exemplary embodiment of the application is shown in the figure.

[0045] Figure 3 The working curve schematic diagram provided by an exemplary embodiment of the application is shown in the figure.

[0046] Figure 4 The flowchart of the air volume control method of the central oil fume purification system provided by an exemplary embodiment of the application is shown in the figure.

[0047] Figure legend:

[0048] 1-central control unit; 2-common flue; 3-main fan; 4-connection pipeline; 5-air volume adjusting element; 6-exhaust hood.

[0049] The drawings herein are incorporated into the specification and form part of the specification, show embodiments consistent with the application, and together with the specification serve to explain the principles of the application. DETAILED DESCRIPTION

[0050] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further described in detail below in combination with the drawings of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0051] The terms used in the embodiments of the present application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0052] In a specific embodiment, the present application is further described in detail below by specific embodiments and in combination with the drawings.

[0053] Those skilled in the art understand that, as described in the background, the existing central oil fume purification system has more or less defects, for example, the existing structural features can cause a large difference in the smoke exhaust effect of the range hood on high floors and low floors, that is, the air volume on different floors is not evenly distributed, which brings bad actual use effect to some users.

[0054] Therefore, in order to overcome the imperfections of the prior art, the technical solutions of the embodiments of the present application provide a central oil fume purification system and an air volume control method thereof. The central oil fume purification system is composed of a set of system through the cooperation between each component (unit), and in this system, the action of different components is controlled by a reasonable algorithm, so as to achieve the uniform distribution of air volume of the central oil fume purification system on different floors.

[0055] Specifically, as shown in Figure 1 and Figure 2 , the central oil fume purification system can be installed in a multi-story or high-rise building, which comprises a central control unit 1, a main fan 3, a plurality of range hoods 6 and a plurality of air volume adjusting elements 5.

[0056] The central control unit 1 is electrically connected with the main fan 3 and the plurality of range hoods 6, respectively, and the main fan 3 is installed in the public flue 2.

[0057] The plurality of range hoods 6 are respectively installed in different kitchens of each floor, and each range hood 6 is communicated with the public flue 2 through a respective connecting pipeline 4.

[0058] The respective air volume adjusting element 5 is arranged on each connecting pipeline 4.

[0059] It can be understood that the above main fan can also be referred to as a smoke exhaust main machine or an outdoor main machine, which is in communication with the public flue and is generally installed at the top of the public flue. The above range hood and the air volume adjusting element are both multiple, and the specific number thereof needs to be determined according to the specific building and other actual conditions.

[0060] In the central oil fume purification system, the range hood can include a self-defined module, which can be used to set a first air volume, which can be defined as Qd. The first air volume is an air volume that can ensure the effect of the user's oil fume extraction and meet the user's demand. Moreover, the range hood can obtain preset working parameters of the range hood according to the set first air volume Qd, that is, in the range hood system, there is a certain relationship between the air volume and other working parameters such as the speed, current, voltage, etc. When one or more quantities are determined, the quantity of the other parameters can also be determined. Therefore, on the basis of obtaining the first air volume Qd of the user's demand, the range of the current, speed and other working parameters corresponding to the first air volume in the range hood can be known. The specific representation of the relationship between the air volume and the current, speed and other working parameters is known by those skilled in the art according to the prior art, and the embodiments of the present application do not limit it and will not be described in detail.

[0061] The range hood can also include a sending module for sending the actual working parameters of the range hood to the central control unit. Through the setting of the sending module, the actual working parameters of the range hood during operation can be sent to the central control unit, and the central control unit can intelligently analyze and judge the actual working parameters of each range hood.

[0062] In some embodiments, the range hood includes a brushless direct current motor (BLDC), and the range hood can output a constant air volume. The brushless direct current motor has the characteristics of high efficiency, fast response, high reliability, good stability, wide speed regulation range, etc. There are many ways to achieve the method of constant air volume output of the range hood, for example, the motor parameters in the range hood can be detected, the real-time air volume of the exhaust port of the range hood can be obtained according to the motor parameters, the real-time air volume can be kept constant by adjusting the motor parameters, and thus the oil fume extraction effect is ensured; or, a non-feedback manner can also be used, the speed torque control parameters of the motor are designed separately and fixed according to the physical characteristics of the fan, the constant output of the air volume is realized according to the relationship between the speed torque control parameters of the motor and the air volume, and thus the range hood system is maintained in a constant air volume state.

[0063] The range hood can be a BLDC motor driven range hood capable of constant air volume output, which has the ability of parameter feedback, can timely feedback the motor current (P_working_i), rotation speed (P_working_rpm) and other working parameters when the range hood is working, and any one or more of the working parameters can be used as the working point (P_working) to be characterized.

[0064] It should be noted that the specific implementation of the constant air volume output of the range hood is not limited by the embodiments of the present application, and can be selected and set by a person skilled in the art according to the actual situation, which will not be described here.

[0065] The central control unit includes an acquisition module, a receiving module and a processing module. The acquisition module is configured to acquire preset working parameter information of each range hood. The receiving module is configured to receive actual working parameter information sent by each range hood. The processing module is configured to compare the preset working parameter and the actual working parameter of each range hood respectively, and generate a judgment result, and send the judgment result to the main fan.

[0066] Specifically, in the central control unit, the acquisition module is mainly used to acquire the preset working parameter information of each range hood, and send the acquired preset working parameter information of each range hood to the processing module, that is, the output end of the acquisition module is connected with the input end of the processing module. On the one hand, the output end of the self-defined module of the range hood can be connected with the input end of the acquisition module, so that the preset working parameter information of each range hood can be acquired. On the other hand, after setting the first air volume Qd in each range hood, the preset working parameters of the range hood are directly inputted in the acquisition module of the central control unit, such as the preset working current range and the preset working rotation speed range of the range hood.

[0067] The receiving module is mainly used to receive the actual working parameter information sent by each range hood, and send the received actual working parameter information of each range hood to the processing module. The input end of the receiving module is connected with the output end of the sending module of the range hood, and the output end of the receiving module is connected with the input end of the processing module. The processing module is mainly used for intelligent analysis and comparison of the preset working parameter and the actual working parameter of each range hood, and generates a judgment result, and sends the judgment result to the main fan. The input end of the processing module can be connected with the receiving module and the acquisition module respectively, and the output end of the processing module can be connected with the input end of the main fan.

[0068] The central oil fume purification system, the main fan is mainly used for adjusting the speed of the main fan or controlling the start-stop state of the main fan according to the judgment result of the processing module of the central control unit, so that the actual working parameters of at least part of the range hood are adapted to the preset working parameters, that is, the actual air volume of some range hoods is within the set first air volume range, and then the actual air volume of some range hoods is within the set first air volume range.

[0069] It should be pointed out that the actual working parameters of at least part of the range hood are adapted to the preset working parameters, which can be the actual working parameters of some or some range hoods adapted to the preset working parameters. Generally, these range hoods do not include all range hoods. That is, through the adjustment of the running state of the main fan, the actual air volume of some range hoods can be within the set first air volume range, and when the running state of the main fan is in an abnormal state, the air volume can be adjusted by the air volume adjusting element to make the actual air volume of the range hood exceeding the set air volume range within the specified second air volume range.

[0070] As can be seen above, when the main fan is working normally, the actual working parameters of some range hoods can be within the preset working parameter range, and the air volume of some range hoods can be within the specified range. At this time, the air volume adjusting element can not work. When the main fan in the central oil fume purification system works, or the main fan continuously increases the speed, the pressure in the system will decrease, and the flow (air volume) will increase, so that the air volume of some or some range hoods is greater than the maximum value of the specified air volume range, and at this time the speed of the main fan is higher than the highest speed, or the main fan is in an abnormal running state. Therefore, the central oil fume purification system provided by the application is provided with an air volume adjusting element, which is arranged on each connecting pipeline, so that when the running state of the main fan is in an abnormal running state, the air volume adjusting element is used to adjust the air volume, so that the air volume of each range hood is within the set air volume value range, thereby alleviating the problem of uneven air volume distribution on each floor.

[0071] Specifically, the air volume adjusting element includes a setting unit, which is mainly used for user to set the second air volume, which can be defined as Qv, and the second air volume Qv needs to be greater than the first air volume Qd. The air volume adjusting element is used to adjust the air volume through the air volume adjusting element when the running state of the main fan is in an abnormal state and the actual air volume flowing through the air volume adjusting element is greater than the second air volume, until the actual air volume of each range hood is within the set second air volume value range.

[0072] It can be understood that when setting the second air volume Qv, the range value of the first air volume Qd needs to be referred to, and the range value of the second air volume Qv needs to be greater than the range value of the first air volume Qd. Since the first air volume Qd set by the range hood is less than the second air volume Qv defined by the air volume adjusting element, the air volume adjusting element can not work under normal circumstances.

[0073] Further, with reference to Figure 3 It is shown that the first air volume Qd that can ensure the oil smoke suction effect at each user's home is defined first. On the Qd curve, the following working points can be obtained according to the physical characteristics of the BLDC motor, for example:

[0074] a) On the Qd curve, the upper limit value (P_up_limit) point of the preset working parameter is determined by giving a certain margin to the maximum power limit, so that the preset working current value (P_up_limit_i), the preset working maximum speed (P_up_limit_rpm) and other indicators of the point can be obtained.

[0075] b) On the Qd curve, the lower limit value (P_low_limit) point of the preset working parameter is determined by giving a certain margin to the minimum speed limit, so that the preset working current value (P_low_limit_i), the preset working minimum speed (P_low_limit_rpm) and other indicators of the point can be obtained.

[0076] c) In addition, from the stability of control, a preset working recovery value (P_reduce) point can be found below the upper limit value (P_up_limit) point of the preset working parameter on the Qd curve, so that the preset working current value (P_reduce_i), the preset working maximum speed (P_reduce_rpm) and other indicators of the point can be obtained. Of course, according to the actual situation, the preset working recovery value can be set or not set.

[0077] The above indicators can be used as the input of the central control unit, that is, they can be input into the acquisition module of the central control unit, and after being analyzed and processed by the processing module, they are used to execute the control action.

[0078] Further, with reference to Figure 3As shown, the second air volume control point Qv of the set air volume adjusting element is greater than the first air volume Qd. The air volume adjusting element can be a regulating valve with constant air volume self-adaptive adjusting function. As can be seen from the working characteristics of the constant air volume regulating valve, when the flow of the flow regulating valve is less than the specified flow (air volume), the regulating valve does not work. Since the first air volume Qd set by the range hood with BLDC is less than the second air volume Qv specified by the regulating valve, the regulating valve can not work under normal circumstances. When the main fan in the central oil fume purification system works, the pressure in the system is low, which can cause the flow to increase. When the speed of the main fan is higher than its maximum speed or the main fan is in an abnormal operating state, the regulating valve can be used to automatically adjust the air volume, so that the air volume of each range hood is stable within the set air volume value range, and the air volume of each floor can be balanced to achieve air volume self-adaptation.

[0079] Therefore, through the cooperation of the above-mentioned central control unit, main fan, range hood and air volume adjusting element, the system can alleviate the problem of uneven air volume distribution on each floor, and the air volume of one or more range hoods will not be outside the specified range, thereby achieving uniform smoke exhaust effect between each floor, especially between high and low distribution floors. Moreover, the user can operate more conveniently and simply. In addition, the central oil fume purification system does not need to increase additional sensors, and the algorithm is simpler than simply controlling the electric valve, and is more reliable and stable, which can improve the user experience effect.

[0080] In a possible implementation, the air volume adjusting element includes a self-operated regulating valve, which is adapted to self-adaptively adjust the opening angle of the regulating valve.

[0081] According to the embodiments of the present application, through the setting of the air volume adjusting element, the air volume can be adjusted when the main fan is in an abnormal operating state, the dynamic balance of the system air volume is maintained, and the air volume of each range hood is within the specified air volume range.

[0082] It can be understood that the above-mentioned air volume adjusting element can adopt a regulating valve with constant air volume self-adaptive adjusting function. The regulating valve can be a self-operated regulating valve, which can self-adaptively adjust the opening angle of the valve, i.e., the regulating valve can automatically adjust the air volume. Therefore, the self-operated regulating valve can work without relying on external power, and the dynamic balance of the system flow can be conveniently achieved. Therefore, the self-operated regulating valve can not be connected with the central control unit, and the flow can be automatically adjusted to be stable within the specified range.

[0083] The self-operated regulating valve can also be referred to as a self-operated control valve, which is a valve driven by the pressure, temperature, flow and the like of the medium flowing through the valve as energy to automatically work. In the embodiment of the application, the self-operated regulating valve is a self-operated flow regulating valve, which can also be referred to as a self-operated flow control valve, which can work without relying on external power, can set the flow according to the design or actual requirements, can automatically eliminate the pressure difference fluctuation of the system, can keep the flow constant, has the advantages of high regulating precision, energy saving, sensitive response and accurate control and the like.

[0084] It can be understood that, in general, the self-operated flow regulating valve is a double-valve combination in structure, including a manual regulating valve group and an automatic balancing valve group, wherein the manual regulating valve group functions to set the flow, and the automatic balancing valve group functions to maintain the flow constant. Therefore, when the air volume regulating element adopts the self-operated flow regulating valve, the setting unit for the user to set the second air volume can be the manual regulating valve group. Each opening degree of the manual regulating valve group corresponds to a flow, and the relationship between the opening degree and the flow is calibrated by a test bench, and the opening degree display and locking device are provided. The specific structure or model of the self-operated flow regulating valve is not limited in the embodiment of the application, and the specific working principle of the self-operated regulating valve can also be known by those skilled in the art according to the prior art, which will not be described here.

[0085] For example, when the self-operated flow regulating valve is adopted by the air volume regulating element, the set second air volume Qv is 6-24 m 3 / min, and the first air volume Qd is 5-23 m 3 / min; when the running state of the main fan is in an abnormal state, the actual air volume flowing through the regulating valve is greater than the set second air volume Qv, at this time, the automatic balancing valve group in the self-operated flow regulating valve can be used to maintain the air volume in the specified range, and further make the actual air volume of the range hood in the set second air volume range.

[0086] It should be understood that the ranges of the first air volume Qd and the second air volume Qv listed are only exemplary and are not limited thereto, and in actual application, the user demand or actual situation can be flexibly selected and set.

[0087] In a possible implementation, the running state of the main fan in the abnormal state includes at least one of that the actual speed of the main fan is outside the rated speed, the actual current of the main fan is outside the rated current, the actual voltage of the main fan is outside the rated voltage or the rated power of the main fan is outside the rated power.

[0088] It can be understood that the running state of the main fan is in an abnormal state, which can be characterized by various parameters of the main fan, and can be mainly represented by the running parameters of the main fan. For example, when the actual speed of the main fan is outside the rated speed, i.e., the actual speed of the main fan is higher than the highest speed, the running state of the main fan is in an abnormal state; or when the actual current of the fan is outside the rated current, the running state of the main fan is in an abnormal state; or when the actual voltage of the main fan is outside the rated voltage, the running state of the main fan is in an abnormal state, and the like.

[0089] According to the embodiment of the present application, when the main fan is in an abnormal running state, the air volume can be adjusted by the air volume adjusting element to maintain the dynamic balance of the system air volume, so that the air volume of each range hood is within the specified air volume range.

[0090] In a possible implementation, the preset working parameters of the range hood include, but are not limited to, at least one of a preset working current, a preset working speed or a preset working voltage.

[0091] Correspondingly, the actual working parameters include, but are not limited to, at least one of an actual working current, an actual working speed or an actual working voltage.

[0092] The preset working parameters are obtained according to the actual needs of the user of the range hood and correspond to the first air volume of the range hood, which can be a current, a voltage or a speed, etc.

[0093] It should be pointed out that the preset working parameters and the actual working parameters in the embodiment of the present application are not limited to the above three, and the preset parameters will not be described here.

[0094] In a possible implementation, the first air volume includes a first air volume upper limit value and a first air volume lower limit value, the second air volume includes a second air volume upper limit value and a second air volume lower limit value, the second air volume upper limit value is slightly larger than the first air volume upper limit value, and the second air volume lower limit value is slightly larger than the first air volume lower limit value; any point value of the second air volume can be slightly larger than any point value of the first air volume, that is, the second air volume needs to be greater than the first air volume, and the difference between them should not be too large, thereby helping to achieve uniform distribution of air volume of different floors.

[0095] When the running state of the main fan is in an abnormal state and the actual air volume is greater than the second air volume, the air volume is adjusted by the air volume adjusting element until the actual air volume is within the second air volume range.

[0096] To further ensure the uniform distribution of air volume on different floors, optionally, when setting the first air volume and the second air volume, the difference between the second air volume and the first air volume is within a certain range, for example, the difference between the second air volume and the first air volume is ≤2m 3 / min, that is, 0 < second air volume - first air volume ≤ 2m 3 / min, further, the difference between the second air volume and the first air volume is ≤1.5m 3 / min, further, the difference between the second air volume and the first air volume is ≤1m 3 / min; further, the difference between the second air volume and the first air volume is ≤0.5m 3 / min. For example, the difference between the second air volume and the first air volume can be 1m 3 / min, can be 0.5m 3 / min, can be 0.8m 3 / min, etc. For example, when the second air volume control point is 6m 3 / min, the first air volume control point can be 5m 3 / min; or, when the second air volume control point is 10m 3 / min, the first air volume control point can be 9.5m 3 / min; thus, the difference between the two is small, which can achieve the effect of uniform distribution of air volume on different floors.

[0097] Thus, the difference in air volume distribution of the range hood of each user can be ensured as much as possible, and the effect of uniform distribution of air volume on different floors can be achieved.

[0098] Further, in order to reduce the influence of wiring on each decoration user, the central oil fume purification system preferably uses a wireless method for information transmission.

[0099] In a possible implementation, the cooperation between the central control unit and each range hood is wireless communication connection.

[0100] In a possible implementation, the cooperation between the central control unit and the main air fan is wireless communication connection.

[0101] Optionally, wireless transmission can use any one or several of wireless communication methods such as wireless radio frequency, Bluetooth, WIFI, etc. The embodiments of the present application do not limit the specific wireless connection method between the central control unit and each range hood, and the specific wireless connection method between the central control unit and the main air fan, which can be selected and set according to actual conditions.

[0102] Referring to Figure 1 and Figure 2As shown, this application embodiment also provides a method for controlling the air volume of a central fume purification system. The central fume purification system includes a central control unit 1, a main fan 3 installed in a public flue 2, and fume hoods 6 installed on each floor. Each fume hood 6 is connected to the public flue 2 through its own connecting pipe 4, and each connecting pipe 4 is equipped with an air volume regulating element 5.

[0103] The airflow control methods for central kitchen fume purification systems include:

[0104] A first air volume is set in each range hood, and the range hood is adapted to obtain the preset operating parameters of the range hood based on the first air volume;

[0105] The preset operating parameters of each range hood are set in the central control unit. The range hoods feed back their actual operating parameters to the central control unit. The central control unit compares the preset operating parameters of each range hood with the actual operating parameters, generates a judgment result, and sends the judgment result to the main fan.

[0106] Based on the judgment result of the central control unit, the main fan speed is adjusted so that the actual working parameters of at least some range hoods are adapted to the preset working parameters, thereby ensuring that the actual air volume of at least some range hoods is within the set first air volume value range.

[0107] A second air volume is set in the air volume regulating element. The second air volume is greater than the first air volume. When the main fan is in an abnormal operating state and the actual air volume flowing through the air volume regulating element is greater than the second air volume, the air volume regulating element adjusts the air volume so that the actual air volume of each range hood is within the set second air volume value range.

[0108] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the air volume control method described above can be referred to the corresponding process in the aforementioned central fume purification system embodiment, and will not be repeated here.

[0109] This airflow adjustment method can alleviate the problem of uneven airflow distribution across floors, preventing one or more range hoods from exceeding their specified airflow range. It ensures balanced airflow across all floors, achieving adaptive airflow. Furthermore, it is more convenient and simpler for users to operate, requiring no additional sensors. Algorithmically, it is simpler, more reliable, and more stable than simply controlling an electric valve, thus enhancing the user experience.

[0110] Specifically, such as Figure 4 As shown in the figure, this application provides a method for controlling the air volume of a central kitchen fume purification system, including the following steps:

[0111] S1. Set the preset operating parameters for each range hood in the central control unit;

[0112] wherein, the first air volume Qd is set in the self-defined module of each range hood, and the range hood is adapted to obtain preset working parameters of the range hood according to the first air volume Qd, and the preset working parameters can be preset working current, preset working voltage or preset working speed;

[0113] The preset working parameters of each range hood can be directly input into the acquisition module of the central control unit, or the input end of the acquisition module of the central control unit can be electrically connected with the output end of the self-defined module of the range hood.

[0114] S2, turning on the range hood, and feeding the actual working parameter value of the range hood to the central control unit;

[0115] The range hood can be a BLDC motor driven range hood capable of constant air volume output, which has the ability of parameter feedback, and can timely feedback the current, speed and other working parameters of the motor when the range hood is working. The actual working parameters can be fed to the central control unit by using the sending module of the range hood.

[0116] S3, waiting, and acquiring the maximum actual working parameter value in all range hoods;

[0117] Judging the relationship between the maximum actual working parameter value and the preset working parameter, if the maximum actual working parameter value is greater than the upper limit of the preset parameter, turning on the main fan, increasing the speed of the main fan, and judging whether the speed of the main fan is higher than the highest speed of the main fan, if not, continuing to acquire the maximum actual working parameter value in all range hoods, if yes, the main fan does not make adjustment;

[0118] If the maximum actual working parameter value is less than the upper limit of the preset parameter, judging whether the main fan is working, if not, continuing to acquire the maximum actual working parameter value in all range hoods, if yes, reducing the speed of the main fan, and judging whether the speed of the main fan is lower than the lowest speed of the main fan, if not, continuing to acquire the maximum actual working parameter value in all range hoods, if yes, turning off the main fan.

[0119] Wherein, when the working speed of a range hood in the whole system is lower than the lowest speed, the air volume continues to increase, and the air volume can be adjusted by the air volume adjusting element, so that the actual air volume of the range hood is within the set second air volume value range.

[0120] Wherein, when it is judged that the speed of the main fan is higher than the highest speed of the main fan, the main fan does not make adjustment, and the air volume is adjusted by the air volume adjusting element, so that the actual air volume of each range hood is within the set second air volume value range.

[0121] In the air volume control method of the central oil fume purification system, the explanation and description of the air volume adjusting element, the first air volume, the second air volume, etc. can refer to the corresponding description in the foregoing central oil fume purification system embodiment, and will not be repeated here.

[0122] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A central cooking fume purification system, characterized in that, The system comprises a central control unit, a main fan installed in a common flue, and a plurality of hoods installed on each floor, each of the hoods being connected to the common flue through a respective connecting pipeline, and each of the connecting pipelines being provided with a wind volume adjusting element; The hood comprises a self-defining module for setting a first wind volume, and the hood is adapted to obtain preset working parameters of the hood according to the first wind volume; the hood further comprises a sending module for sending actual working parameters of the hood to the central control unit; The central control unit comprises an obtaining module, a receiving module, and a processing module; the obtaining module is used to obtain preset working parameter information of each hood; The receiving module is used to receive actual working parameter information sent by each hood; The processing module is used to compare the preset working parameters and the actual working parameters of each hood respectively, and generate a judgment result, and send the judgment result to the main fan; The main fan is used to adjust the rotating speed of the main fan according to the judgment result, so that the actual working parameters of at least part of the hoods are adapted to the preset working parameters, and the actual wind volumes of at least part of the hoods are within the set first wind volume range; The wind volume adjusting element comprises a setting unit for setting a second wind volume by a user, the second wind volume being greater than the first wind volume; the first wind volume comprises a first upper limit value and a first lower limit value, the second wind volume comprises a second upper limit value and a second lower limit value, the second upper limit value being greater than the first upper limit value, and the second lower limit value being greater than the first lower limit value; The wind volume adjusting element is used to adjust the wind volume through the wind volume adjusting element when the operating state of the main fan is an abnormal state and the actual wind volume flowing through the wind volume adjusting element is greater than the second wind volume, until the actual wind volume of each hood is within the set second wind volume range; The operating state of the main fan being an abnormal state includes at least one of the actual rotating speed of the main fan being outside a rated rotating speed, the actual current of the main fan being outside a rated current, the actual voltage of the main fan being outside a rated voltage, or the rated power of the main fan being outside a rated power; The wind volume adjusting element comprises a self-powered adjusting valve adapted to self-adaptively adjust the opening angle of the adjusting valve.

2. The central cooking fume purification system according to claim 1, characterized in that, The hood comprises a brushless DC motor adapted to output a constant wind volume.

3. The central cooking fume purification system according to claim 1, characterized in that, The preset working parameters of the hood include at least one of a preset working current, a preset working rotating speed, or a preset working voltage; The actual working parameters include at least one of an actual working current, an actual working rotating speed, or an actual working voltage.

4. The central cooking fume purification system according to claim 1, characterized in that, The central control unit and each of the hoods are connected in wireless communication.

5. The central cooking fume purification system according to claim 1, wherein The central control unit and the main fan are connected in wireless communication.

6. A method for controlling the air volume of a central cooking fume purification system, characterized in that, The central oil fume purification system comprises a central control unit, a main fan installed in a public flue, and an oil fume extractor installed on each floor, each of the oil fume extractors is communicated with the public flue through a connecting pipeline, and a wind volume adjusting element is arranged on each connecting pipeline; the wind volume adjusting element comprises a self-adjusting valve, which is adapted to self-adaptively adjust the opening angle of the adjusting valve; The wind volume control method of the central oil fume purification system comprises the following steps: A first wind volume is set in each oil fume extractor, and the oil fume extractor is adapted to obtain preset working parameters of the oil fume extractor according to the first wind volume; The preset working parameters of each oil fume extractor are set in the central control unit, the actual working parameters of the oil fume extractor are fed back to the central control unit, the central control unit compares the preset working parameters with the actual working parameters of each oil fume extractor respectively, generates a judgment result, and sends the judgment result to the main fan; According to the judgment result of the central control unit, the main fan adjusts the rotating speed, so that the actual working parameters of at least part of the oil fume extractors are adapted to the preset working parameters, and then the actual wind volumes of at least part of the oil fume extractors are in the set first wind volume value range; A second wind volume is set in the wind volume adjusting element, the second wind volume is greater than the first wind volume, the first wind volume comprises a first upper limit value and a first lower limit value, the second wind volume comprises a second upper limit value and a second lower limit value, the second upper limit value is greater than the first upper limit value, and the second lower limit value is greater than the first lower limit value; When the operating state of the main fan is an abnormal state, and the actual wind volume flowing through the wind volume adjusting element is greater than the second wind volume, the wind volume adjusting element adjusts the wind volume, so that the actual wind volume of each oil fume extractor is in the set second wind volume value range; The operating state of the main fan is an abnormal state, which comprises at least one of the following: the actual rotating speed of the main fan is out of the rated rotating speed, the actual current of the main fan is out of the rated current, the actual voltage of the main fan is out of the rated voltage, or the rated power of the main fan is out of the rated power.

7. The method of claim 6, wherein the air volume control method of the central cooking fume purification system is characterized by, The wind volume control method of the central oil fume purification system comprises the following steps: The preset working parameters of each oil fume extractor are set in the central control unit; The oil fume extractor is started, and the actual working parameter value of the oil fume extractor is fed back to the central control unit; The maximum actual working parameter value in all oil fume extractors is obtained; The relationship between the maximum actual working parameter value and the preset working parameters is judged, if the maximum actual working parameter value is greater than the upper limit of the preset parameters, the main fan is started, the rotating speed of the main fan is increased, and whether the rotating speed of the main fan is higher than the highest rotating speed of the main fan is judged, if not, the maximum actual working parameter value in all oil fume extractors is continuously obtained, if yes, the main fan is not adjusted; If the maximum actual working parameter value is less than the upper limit of the preset parameters, whether the main fan works is judged, if not, the maximum actual working parameter value in all oil fume extractors is continuously obtained, if yes, the rotating speed of the main fan is decreased, and whether the rotating speed of the main fan is lower than the lowest rotating speed of the main fan is judged, if not, the maximum actual working parameter value in all oil fume extractors is continuously obtained, if yes, the main fan is stopped.

8. The method of claim 7, wherein the air volume control method of the central cooking fume purification system is characterized by, When it is judged that the rotation speed of the main fan is higher than the highest rotation speed of the main fan, the main fan is not adjusted, and the air volume is adjusted by the air volume adjusting element, so that the actual air volume of each of the range hood is within the set second air volume value range.

9. The method of claim 6-8, wherein the method further comprises: The preset working parameter includes at least one of a preset working current, a preset working rotation speed, or a preset working voltage. The actual working parameter includes at least one of an actual working current, an actual working rotation speed, or an actual working voltage.

10. The method of claim 6-8, wherein the method further comprises: The air volume adjusting element includes a self-adjusting valve, which is adapted to self-adaptively adjust the opening angle of the valve.

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