Air volume detection method of air system

Abstract

The application discloses a wind volume detection method of a wind system, which comprises the following steps: obtaining a first corresponding relationship between preset working parameters of a fan and wind volume of the fan; obtaining a second corresponding relationship between wind volume of at least one branch air pipe and a pressure parameter according to the first corresponding relationship, wherein the pressure parameter comprises a pressure value at an air outlet of the fan, at a branch device, at a flow channel between the air outlet of the fan and the branch device, or at a connection between the branch device and one of the branch air pipes; obtaining ventilation states of the branch air pipes when the wind system is normally working; and obtaining the wind volume of the branch air pipe in the ventilation state according to the second corresponding relationship matched with the branch air pipe in the ventilation state and a current value of the pressure parameter corresponding to the ventilation state. The wind volume detection is realized at low cost and with high reliability.

Description

Technical Field

[0001] This invention relates to the field of air volume detection, and more specifically, to a method for detecting air volume in a wind system. Background Technology

[0002] Currently, most central ventilation systems on the market can only meet the requirement of supplying fresh air to each room, but they cannot simultaneously and accurately detect the air volume delivered to each room. Traditional air volume detection methods mostly involve testing each duct individually using detection devices (such as Pitot tubes, Venturi tubes, electric heating devices, etc.). When there are numerous ducts in the ventilation system, this method not only makes the ventilation system extremely complex, but the detection devices themselves also cause pressure loss, making it impossible to guarantee detection accuracy. In addition, this detection method is labor-intensive, requiring a lot of manpower and time, resulting in high detection costs.

[0003] Therefore, based on years of experience and practice in related industries, the inventor proposes a method for detecting air volume in a ventilation system to overcome the shortcomings of existing technologies. Summary of the Invention

[0004] The purpose of this invention is to provide a method for detecting air volume in a ventilation system, which can reduce the cost required for detecting the air volume of branch ducts in a ventilation system, while also ensuring the accuracy of air volume detection.

[0005] This invention can be implemented using the following technical solutions:

[0006] The present invention provides a method for detecting the air volume of a ventilation system, the ventilation system including a fan, a distribution device, and multiple branch ducts, wherein the air outlet of the fan is connected to the inlet of the distribution device, and the outlet of the distribution device is connected to the multiple branch ducts.

[0007] The air volume detection method includes:

[0008] Obtain the first correspondence between the preset operating parameters of the fan and the air volume of the fan;

[0009] Based on the first correspondence, a second correspondence between the air volume and pressure parameters of at least one branch duct is obtained. The pressure parameters include the pressure value at the air outlet of the fan, the air distribution device, the flow channel between the air outlet of the fan and the air distribution device, or the connection between the air distribution device and one of the branch ducts.

[0010] Obtain the ventilation status of multiple branch ducts when the air system is operating normally;

[0011] Based on the second correspondence that matches the branch duct in the ventilated state and the current value of the pressure parameter corresponding to the ventilated state, the air volume of the branch duct in the ventilated state is obtained.

[0012] In a preferred embodiment of the present invention

[0013] The step of obtaining the first correspondence specifically includes: obtaining the correspondence between the preset operating parameters and the air volume of the fan when the fan is running at one or more speeds, as the first correspondence.

[0014] In a preferred embodiment of the present invention

[0015] The step of obtaining the second correspondence between the air volume and pressure parameters of at least one branch duct specifically includes: controlling each of the predetermined number of branch ducts to be in a ventilation state individually;

[0016] Based on the first correspondence and the value of the preset working parameter, the air volume of the branch duct in the ventilation state is obtained, and the pressure parameter is obtained, thus forming a second correspondence between the air volume of the branch duct in the ventilation state and the pressure parameter.

[0017] In a preferred embodiment of the present invention

[0018] The second correspondence includes the correspondence between the air volume of the branch duct in ventilation state obtained when the fan is running at one or more speeds and the pressure parameter.

[0019] In a preferred embodiment of the present invention

[0020] The air system also includes multiple flow control devices, which are installed on the branch ducts or the air distribution devices;

[0021] The step of controlling each of the predetermined number of branch ducts to be in an individual ventilation state specifically includes: individually controlling the flow control device corresponding to each branch duct to be in an open state.

[0022] In a preferred embodiment of the present invention

[0023] The air system also includes multiple flow control devices, which are installed on the branch ducts or the air distribution devices;

[0024] The step of obtaining the ventilation status of the multiple branch ducts when the air system is working normally specifically includes: obtaining the opening and closing status of the multiple flow control devices.

[0025] In a preferred embodiment of the present invention

[0026] The step of obtaining the air volume of the branch duct under the ventilation state specifically includes:

[0027] Obtain the current value of the pressure parameter;

[0028] The current value of the pressure parameter is substituted into the second correspondence that matches the branch duct in the ventilated state to obtain the air volume of the branch duct in the ventilated state.

[0029] In a preferred embodiment of the present invention, each of the branch ducts includes at least one first branch duct and at least one second branch duct.

[0030] The step of obtaining the second correspondence between the air volume and pressure parameters of at least one branch duct specifically includes: controlling at least one first branch duct among the multiple branch ducts to be in a ventilation state alone, and obtaining the second correspondence between the air volume and pressure parameters of the at least one first branch duct.

[0031] Keep at least one first branch duct in a ventilated state, and open at least one second branch duct separately;

[0032] Obtain the current value of the pressure parameter, and based on the obtained current value of the pressure parameter and the second correspondence between the air volume of the first branch duct and the pressure parameter, obtain the current value of the air volume of the first branch duct.

[0033] Based on the current value of the pressure parameter, the first correspondence, and the current value of the air volume of the first branch duct, obtain the current value of the air volume of the second branch duct;

[0034] Based on the current value of the air volume of the second branch duct and the current value of the pressure parameter, a second correspondence between the air volume of the second branch duct and the pressure parameter is obtained.

[0035] In a preferred embodiment of the present invention, each of the branch ducts further includes at least one third branch duct. After obtaining the second correspondence between the air volume and pressure parameters of the second branch duct,

[0036] Keep both the first branch duct and the second branch duct in a ventilated state, and open at least one third branch duct separately;

[0037] Based on the current value of the pressure parameter, the first correspondence, and the second correspondence that matches the first branch duct and the second branch duct respectively, the current value of the air volume of the fan, the first branch duct, and the second branch duct is obtained.

[0038] Based on the current air volume values ​​of the fan, the first branch duct, and the second branch duct, obtain the current air volume value of the third branch duct;

[0039] Based on the current value of the air volume of the third branch duct and the current value of the pressure parameter, a second correspondence between the air volume of the third branch duct and the pressure parameter is obtained.

[0040] This invention provides a method for detecting the air volume of a ventilation system, the ventilation system including a fan, a distribution device, and multiple branch ducts, wherein the air outlet of the fan is connected to the inlet of the distribution device, and the outlet of the distribution device is connected to the multiple branch ducts.

[0041] The air volume detection method includes:

[0042] Obtain the correspondence between the preset operating parameters of the fan and the air volume of the fan;

[0043] Based on the correspondence, obtain the air volume ratio or air resistance ratio among the multiple branch ducts;

[0044] Obtain the ventilation status of multiple branch ducts when the air system is operating normally;

[0045] The air volume of the branch duct in the ventilated state is obtained based on the air volume ratio or air resistance ratio of the branch duct in the ventilated state to the current value of the air volume of the fan.

[0046] In a preferred embodiment of the present invention, the step of obtaining the air volume ratio or air resistance ratio among the plurality of branch ducts specifically includes:

[0047] Each of the predetermined number of branch ducts is individually in a ventilation state;

[0048] Based on the correspondence, the air volume of each branch duct in a predetermined number of individual ventilation states is obtained to obtain the air volume ratio or air resistance ratio among multiple branch ducts.

[0049] In a preferred embodiment of the present invention, when the ventilation areas of the multiple branch ducts are the same, the wind speed ratio among the multiple branch ducts is obtained according to the correspondence between the preset operating parameters of the fan and the air volume of the fan.

[0050] In a preferred embodiment of the present invention, the step of obtaining the wind speed ratio relationship among the plurality of branch ducts specifically includes:

[0051] Each of the predetermined number of branch ducts is individually in a ventilation state;

[0052] Based on the correspondence, the air volume of each branch duct in a predetermined number of individual ventilation states is obtained to obtain the wind speed ratio relationship among multiple branch ducts.

[0053] In a preferred embodiment of the present invention, each of the branch ducts includes at least one first branch duct and at least one second branch duct.

[0054] The step of obtaining the air volume ratio or air resistance ratio among the multiple branch ducts specifically includes: controlling the first branch duct among the multiple branch ducts to be in a ventilation state alone, and obtaining the correspondence between the air volume of the first branch duct and the preset operating parameters of the fan.

[0055] Keep at least one of the first branch ducts in a ventilated state, and open at least one of the second branch ducts separately;

[0056] Obtain the current value of the preset operating parameters of the fan, and obtain the current value of the air volume of the first branch duct based on the obtained current value of the preset operating parameters of the fan and the correspondence between the air volume of the first branch duct and the preset operating parameters of the fan.

[0057] Based on the current values ​​of the preset operating parameters of the fan and the correspondence between the preset operating parameters of the fan and the air volume of the fan, the current value of the air volume of the fan is obtained.

[0058] Based on the current value of the air volume of the fan and the current value of the air volume of the first branch duct, obtain the current value of the air volume of the second branch duct;

[0059] Based on the current air volume values ​​of the first branch duct and the second branch duct, obtain the air volume ratio or air resistance ratio between the first branch duct and the second branch duct.

[0060] In a preferred embodiment of the present invention, each of the branch ducts includes at least one third branch duct;

[0061] After obtaining the airflow ratio or air resistance ratio based on the current airflow values ​​of the first branch duct and the second branch duct,

[0062] Keep both the first branch duct and the second branch duct in a ventilated state, and open at least one of the third branch ducts separately;

[0063] Based on the current value of the air volume of the first branch duct, the air volume ratio or air resistance ratio between the first branch duct and the second branch duct, and the current value of the air volume of the fan, the current value of the air volume of the third branch duct is obtained.

[0064] Based on the current air volume values ​​of the first branch duct, the second branch duct, and the third branch duct, obtain the air volume ratio or air resistance ratio among the first branch duct, the second branch duct, and the third branch duct.

[0065] In a preferred embodiment of the present invention

[0066] The step of obtaining the correspondence specifically includes: obtaining the correspondence between the preset operating parameters of the fan when it is running at one or more speeds and the air volume of the fan, as the correspondence.

[0067] In a preferred embodiment of the present invention, the air volume ratio relationship includes: the air volume ratio obtained when the branch duct is in ventilation state when the fan is running at one or more speeds;

[0068] The wind resistance ratio includes the wind resistance ratio of the branch duct when it is in ventilation mode, obtained when the fan is running at one or more speeds.

[0069] In a preferred embodiment of the present invention

[0070] The air system also includes multiple flow control devices, which are installed on the branch ducts or the air distribution devices;

[0071] The step of controlling a predetermined number of branch ducts to be individually ventilated includes: individually controlling the flow control device corresponding to each branch duct to be in the open state.

[0072] In a preferred embodiment of the present invention

[0073] The air system also includes multiple flow control devices, which are installed on the branch ducts or the air distribution devices;

[0074] The step of obtaining the ventilation status of the multiple branch ducts when the air system is working normally specifically includes: obtaining the opening and closing status of the multiple flow control devices.

[0075] In a preferred embodiment of the present invention, the step of obtaining the air volume of the branch duct in a ventilated state includes:

[0076] Obtain the current value of the air volume of the fan;

[0077] The current value of the air volume is proportionally allocated according to the air volume ratio, air resistance ratio, or air velocity ratio among the branch ducts in the ventilated state, thereby obtaining the air volume of the branch ducts in the ventilated state.

[0078] In a preferred embodiment of the present invention, the preset operating parameters of the fan include one or a combination of the following:

[0079] The current value of the fan,

[0080] The pressure difference between the air inlet and outlet of the fan,

[0081] The pressure value at the air outlet of the fan, or at the air distribution device, or at the flow channel between the air outlet of the fan and the air distribution device, or at the connection point between the air distribution device and one of the branch ducts.

[0082] In a preferred embodiment of the present invention, the air system further includes a pressure detection device, which is disposed at the air outlet of the fan, the air distribution device, or the flow channel between the air outlet of the fan and the air distribution device, and measures the pressure value at the air outlet of the fan, the air distribution device, the flow channel between the air outlet of the fan and the air distribution device, or the connection point between the air distribution device and one of the branch ducts.

[0083] In a preferred embodiment of the present invention, the flow control device includes an air valve.

[0084] In a preferred embodiment of the present invention, the air distribution device includes a pressure equalization chamber, and a plurality of the branch ducts are directly connected to the pressure equalization chamber.

[0085] In a preferred embodiment of the present invention, the air system includes a fresh air unit, the fresh air unit is disposed inside the fresh air unit, and the fresh air unit is directly connected to the air distribution device or connected through a pipeline.

[0086] In a preferred embodiment of the present invention, the air system is installed indoors, and the outlets of the plurality of branch air ducts are respectively located in a plurality of rooms.

[0087] As described above, the characteristics and advantages of the air volume detection method for the air system of the present invention are: based on the preset engineering parameters of the fan, the air volume, and the pressure parameters in the air system, it is not necessary to conduct separate tests on each branch duct or each room, which can reduce the cost required to test the air volume of the branch ducts in the air system, while also ensuring the accuracy of air volume detection. Attached Figure Description

[0088] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0089] Figure 1 : This is a schematic diagram of the structure of the air system in the air volume detection method of the air system according to an embodiment of the present invention.

[0090] Figure 2 This is one of the flowcharts for the air volume detection method of the air system according to an embodiment of the present invention.

[0091] Figure 3 This is the second flowchart of the air volume detection method for the air system according to an embodiment of the present invention.

[0092] Figure 4 This is the third flowchart of the air volume detection method for the air system according to an embodiment of the present invention.

[0093] Figure 5 This is the fourth flowchart of the air volume detection method for the air system according to an embodiment of the present invention.

[0094] Figure 6 This is the fifth flowchart of the air volume detection method for the air system according to an embodiment of the present invention.

[0095] Figure 7 This is the sixth flowchart of the air volume detection method for the air system according to an embodiment of the present invention.

[0096] Figure 8 : This is a curve showing the change between air volume and pressure parameters in the branch duct of the air system at different fan speeds in the air volume detection method of the air system according to an embodiment of the present invention.

[0097] Relationship curve graph.

[0098] The reference numerals in the accompanying drawings of this invention are:

[0099] 1. Fan; 2. Air distribution device;

[0100] 3. Branch ducts; 4. Flow control device;

[0101] 5. Fresh air unit; 6. Pressure detection device. Detailed Implementation

[0102] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0103] like Figure 1 As shown, the present invention provides a method for detecting the air volume of a wind system, wherein the wind system includes a fan 1, a wind distribution device 2 and multiple branch ducts 3 (e.g., L1, L2 and L3), the air outlet of the fan 1 is connected to the inlet of the wind distribution device 2, and the outlet of the wind distribution device 2 is connected to the multiple branch ducts 3.

[0104] like Figure 2 As shown, the airflow detection method of the present invention includes the following steps:

[0105] Step S1-1: Obtain the first correspondence between the preset operating parameters of fan 1 and the air volume of fan 1;

[0106] Furthermore, step S1-1 specifically includes: obtaining the correspondence between the preset operating parameters of the fan 1 when it is running at one or more speeds and the air volume of the fan 1, as the first correspondence.

[0107] If only the preset operating parameters of the fan 1 at a certain speed are obtained, then only the air volume of each branch duct 3 under ventilation state at that speed of the fan 1 can be detected.

[0108] Specifically, such as Figure 8 As shown, if only the preset operating parameters of fan 1 at one speed are obtained (e.g., the pressure value P of fan 1), then only one curve showing the relationship between the pressure value P of fan 1 and the air volume Q of fan 1 can be obtained (e.g., ...). Figure 8 Any one of the relationship curves C1, C2, C3, C4 and C5 (each relationship curve corresponds to a different speed of fan 1), and then obtain the first correspondence between the pressure value P of fan 1 and the air volume Q of fan 1 at that speed.

[0109] If the preset operating parameters of the fan 1 at multiple speeds are obtained, the air volume of each branch duct 3 under ventilation conditions can be detected when the fan 1 is at different speeds.

[0110] Specifically, such as Figure 8 As shown, by obtaining the preset operating parameters of fan 1 at multiple speeds (e.g., the pressure value P of fan 1), multiple curves showing the correspondence between the pressure value P of fan 1 and the air volume Q of fan 1 can be obtained (e.g., ...). Figure 8Any number of relationship curves among C1, C2, C3, C4 and C5 (each relationship curve corresponds to a different speed of fan 1), and then obtain the first correspondence between the pressure value P of fan 1 and the air volume Q of fan 1 at different speeds.

[0111] Step S2-1: Based on the first correspondence, obtain the second correspondence between the air volume and pressure parameters of at least one branch duct 3;

[0112] Among them, the pressure parameters include the pressure value at the air outlet of the fan 1, or the pressure value at the air distribution device 2, or the pressure value at the flow channel between the air outlet of the fan 1 and the air distribution device 2, or the pressure value at the connection between the air distribution device 2 and one of the multiple branch ducts 3.

[0113] Because multiple branch ducts 3 are connected to the outlet of the air distribution device 2, in most cases the pressure values ​​at the inlets of multiple branch ducts 3 are basically the same, and the pressure values ​​at the inlets of multiple branch ducts 3 are also basically the same as the pressure parameters listed above. Therefore, the pressure parameters listed above can be used as the pressure values ​​at the inlets of multiple branch ducts 3, and the pressure values ​​at the inlets of multiple branch ducts 3 can be obtained by detecting the pressure value at only one location.

[0114] More precisely, considering the pressure loss of airflow in the system, the closer the pressure parameter is to the branch duct 3, the higher the accuracy. Therefore, among the selected pressure parameters, collecting the pressure parameter at the air distribution device 2 or the pressure parameter at the connection between the air distribution device 2 and one of the branch ducts 3 can help improve the accuracy of the detection to a certain extent.

[0115] In an optional embodiment of the present invention, such as Figure 3 As shown, each branch duct 3 can be opened individually (only one branch duct 3 is in ventilation state in this step) to obtain the second correspondence between the air volume and pressure parameters of each branch duct 3. Step S2-1 specifically includes:

[0116] Step S201-1: Control each branch duct 3 in a predetermined number of branch ducts 3 to be in an individual ventilation state; wherein, the predetermined number of branch ducts 3 can be all the branch ducts 3 in the air system (i.e., when the total number of branch ducts 3 is three, the predetermined number is 3). When air needs to be supplied to all rooms, it is necessary to control each branch duct 3 in the air system to be in an individual ventilation state; of course, the predetermined number of branch ducts 3 can also be a part of all the branch ducts 3 in the air system (i.e., when the total number of branch ducts 3 is three, the predetermined number is 1 or 2). When air only needs to be supplied to some rooms, it is only necessary to control each branch duct 3 in the air system connected to the room that needs air supply to be in an individual ventilation state.

[0117] Step S202-1: Based on the first correspondence and the value of the preset working parameters, obtain the air volume of the branch duct 3 in the ventilation state alone, and obtain the pressure parameters to form a second correspondence between the air volume and pressure parameters of the branch duct 3 in the ventilation state alone.

[0118] Specifically, when each branch duct 3 is in a ventilation state, the air volume of the branch duct 3 in a ventilation state can be obtained based on the preset operating parameters of the fan 1 at this time and the first correspondence relationship corresponding to the preset operating parameters. At the same time, the pressure parameters at the air distribution device 2 of each branch duct 3 in a ventilation state can be collected respectively. Then, the correspondence relationship between the air volume of each branch duct 3 in a ventilation state and the pressure parameters at the corresponding air distribution device 2 can be obtained, which is the second correspondence relationship.

[0119] Furthermore, the second correspondence specifically includes: the correspondence between the air volume and pressure parameters of the branch duct 3 in a separate ventilation state, obtained when the fan 1 is running at one or more speeds.

[0120] If only the correspondence between the air volume and pressure parameters of a branch duct 3 in ventilation state obtained when the fan 1 is running at a certain speed is obtained, then only the air volume of each branch duct 3 in ventilation state when the fan 1 is running at that speed can be detected.

[0121] Specifically, such as Figure 8 As shown, if only the airflow and pressure parameters of a branch duct 3 in ventilation mode are obtained when the fan 1 is running at one speed, only one point value on the curve corresponding to the pressure value P and the airflow Q of the fan 1 can be obtained (e.g.: Figure 8 The position of the square on any one of the relationship curves C1, C2, C3, C4 and C5 (each square position corresponds to a different speed of fan 1) is used to obtain the second correspondence between the air volume and pressure parameters of the branch duct 3 under ventilation conditions.

[0122] If the correspondence between the air volume and pressure parameters of the branch duct 3 in ventilation state obtained when the fan 1 is running at multiple speeds is obtained, then the air volume of each branch duct 3 in ventilation state at different speeds of the fan 1 can be detected.

[0123] Specifically, such as Figure 8 As shown, by obtaining the correspondence between the air volume and pressure parameters of the branch duct 3 in ventilation state when the fan 1 is running at multiple speeds, multiple point values ​​on the curve corresponding to the pressure value P and the air volume Q of the fan 1 can be obtained (e.g.: Figure 8The positions of the squares on any number of relationship curves among C1, C2, C3, C4 and C5 (each square position corresponds to a different speed of fan 1) are used to obtain the second correspondence between the air volume and pressure parameters of the branch duct 3 under ventilation conditions.

[0124] in addition, Figure 8 Curve C6 in the figure is a measured relationship curve formed by fitting multiple measured points corresponding to the pressure value P and the air volume Q of fan 1. Among them, the curve is formed by... Figure 8 As can be seen, multiple points corresponding to the curve of the relationship between pressure value P and air volume Q of fan 1 fall on or are close to the measured relationship curve. Therefore, the air volume detection method of the present invention has reliable detection accuracy and will not have much impact on the actual user experience of the air system.

[0125] In another alternative embodiment of the invention, such as Figure 1 As shown, each branch duct 3 includes at least one first branch duct L1 and at least one second branch duct L2; the second correspondence between the air volume and pressure parameters of each branch duct 3 can be obtained by sequentially opening each branch duct 3 (in this step, only the branch duct 3 opened for the first time is in a separate ventilation state, and when other branch ducts 3 are opened again, the branch duct 3 opened first is always in a ventilation state). Step S2-1 specifically includes:

[0126] Step S201-1': Control at least one first branch duct L1 among multiple branch ducts 3 to be in ventilation state alone, and obtain the second correspondence between the air volume and pressure parameters of at least one first branch duct L1;

[0127] Specifically, based on the first correspondence between the preset operating parameters of fan 1 and the air volume of fan 1, and the current value of the preset operating parameters of fan 1, the air volume of the first branch duct L1 can be obtained, and the current value of the pressure parameter can be obtained, thus forming a second correspondence between the air volume and the pressure parameter of the first branch duct L1.

[0128] Step S202-1': Keep at least one first branch duct L1 in a ventilated state, and open at least one second branch duct L2 separately (at this time, both the first branch duct L1 and the second branch duct L2 are in a ventilated state).

[0129] Step S203-1': Obtain the current value of the pressure parameter at this time, and according to the obtained current value of the pressure parameter and the second correspondence between the air volume of the first branch duct L1 and the pressure parameter, obtain the current value of the air volume of the first branch duct L1.

[0130] Step S204-1': Based on the current value of the pressure parameter, the first correspondence, and the current value of the air volume of the first branch duct L1, obtain the current value of the air volume of the second branch duct L2;

[0131] Specifically, based on the current value of the pressure parameter and the first correspondence between the preset operating parameters of fan 1 and the air volume of fan 1, the current value of the air volume of fan 1 can be obtained. The current value of the air volume of the second branch duct L2 can be obtained by subtracting the current value of the air volume of fan 1 from the current value of the air volume of the first branch duct L1.

[0132] Step S205-1': Based on the current value of the air volume and the current value of the pressure parameter of the second branch duct L2, obtain the second correspondence between the air volume and the pressure parameter of the second branch duct L2.

[0133] In the above embodiment, the first branch duct L1 is used as a reference duct to obtain the air volume of the second branch duct L2 to be measured. Of course, the number of first branch ducts L1 used as reference ducts can be one or more (when the number of first branch ducts L1 used as reference ducts is multiple, it is necessary to open only one first branch duct L1 used as reference ducts at a time and obtain the corresponding second correspondence, and then make all first branch ducts L1 used as reference ducts in a ventilation state to obtain the air volume of the second branch duct L2 to be measured).

[0134] Furthermore, such as Figure 1 As shown, each branch duct 3 also includes at least one third branch duct L3, and after step S205-1', it further includes:

[0135] Step S206-1': Keep both the first branch duct L1 and the second branch duct L2 in a ventilated state, and open at least one third branch duct L3 separately;

[0136] Step S207-1': Obtain the current value of the air volume of the first branch duct L1 based on the current value of the pressure parameter, the first correspondence, and the second correspondence between the air volume of the first branch duct L1 and the pressure parameter; and obtain the current value of the air volume of the second branch duct L2 based on the current value of the pressure parameter, the first correspondence, and the second correspondence between the air volume of the second branch duct L2 and the pressure parameter.

[0137] Step S208-1': Based on the current value of the air volume of fan 1, the current value of the air volume of the first branch duct L1, and the current value of the air volume of the second branch duct L2, obtain the current value of the air volume of the third branch duct L3.

[0138] Specifically, the current value of the air volume of the fan 1 is obtained by subtracting the current value of the air volume of the first branch duct L1 and the current value of the air volume of the second branch duct L2 from the current value of the air volume of the fan 1.

[0139] Step S209-1': Based on the current value of the air volume and the current value of the pressure parameter of the third branch duct L3, obtain the second correspondence between the air volume and the pressure parameter of the third branch duct L3.

[0140] Step S3-1: Obtain the ventilation status of multiple branch ducts 3 when the air system is working normally;

[0141] Step S4-1: Based on the second correspondence that matches the branch duct 3 in the ventilation state and the current value of the pressure parameter corresponding to the ventilation state, obtain the air volume of the branch duct 3 in the ventilation state.

[0142] Furthermore, such as Figure 4 As shown, step S4-1 specifically includes:

[0143] Step S401-1: Obtain the current value of the pressure parameter at the air distribution device 2;

[0144] Step S402-1: Substitute the current value of the pressure parameter into the second correspondence that matches the branch duct 3 in the ventilated state to obtain the air volume of the branch duct 3 in the ventilated state.

[0145] Specifically, such as Figure 8 As shown, when multiple branch ducts 3 are in a ventilated state, the air volume of each branch duct 3 in the ventilated state can be obtained based on the current value of the pressure parameter collected, such as at the air distribution device 2, and the second correspondence relationship corresponding to the pressure parameter obtained in advance (for example, the relationship curve corresponding to the current value of the pressure parameter is found in C1, C2, C3, C4 and C5, and the square position corresponding to the current value of the pressure parameter on the relationship curve is the current value of the pressure parameter at the air distribution device 2 and the second correspondence relationship corresponding to the pressure parameter obtained in advance).

[0146] In an optional embodiment of the present invention, such as Figure 1 As shown, the air system also includes multiple flow control devices 4, each of which is respectively installed on the corresponding branch duct 3 or the air distribution device 2. In step S201-1, the specific operation of controlling each branch duct 3 in the predetermined number of branch ducts 3 to be in a ventilation state individually includes: individually controlling the flow control device 4 corresponding to each branch duct 3 to be in an open state, so that each branch duct 3 in the predetermined number of branch ducts 3 can be in a ventilation state individually.

[0147] Furthermore, in step S3-1, the specific operation of obtaining the ventilation status of multiple branch ducts 3 when the air system is operating normally includes: obtaining the on / off status of each branch duct 3 by acquiring the on / off status of multiple flow control devices 4. When the flow control device 4 is in the open state, the corresponding branch duct 3 is in the ventilation state; when the flow control device 4 is in the closed state, the corresponding branch duct 3 is in the disconnected state.

[0148] In an optional embodiment of the present invention, the preset operating parameters of the fan 1 include: the current value I of the fan 1, or the pressure difference ΔP between the air inlet and the air outlet of the fan 1, or the pressure value P of the fan 1 (which may be the pressure value at the air outlet of the fan 1, or the pressure value at the air distribution device 2, or the pressure value at the flow channel between the air outlet of the fan 1 and the air distribution device 2, or the pressure value at the connection between the air distribution device 2 and one of the multiple branch ducts 3). Of course, it can also be any two or a combination of three parameters among the current value I, the pressure difference ΔP, and the pressure value P. The preset operating parameters are the operating parameters of the fan 1 in its operating state, and they correspond one-to-one with the air volume of the fan 1 in the corresponding operating state. Each rotational speed of the fan 1 corresponds to a specific preset operating parameter and the corresponding air volume.

[0149] In an optional embodiment of the present invention, such as Figure 1 As shown, the air system also includes a pressure detection device 6. The pressure detection device 6 is located at the air outlet of the fan 1, the air distribution device 2, or the flow channel between the air outlet of the fan 1 and the air distribution device 2. The pressure detection device 6 is used to detect the pressure value at the air outlet of the fan 1, the air distribution device 2, or the flow channel between the air outlet of the fan 1 and the air distribution device 2, or the pressure value at the connection point between the air distribution device 2 and one of the multiple branch ducts 3. Since the air distribution device 2 is closest to the branch duct 3, the accuracy of the detected pressure value is highest when the pressure detection device 6 is located at the air distribution device 2.

[0150] Furthermore, such as Figure 1 As shown, the pressure detection device 6 includes a wind pressure sensor.

[0151] Furthermore, such as Figure 1 As shown, the flow control device 4 includes an air valve.

[0152] Furthermore, such as Figure 1 As shown, the air distribution device 2 includes a pressure equalization chamber, and multiple branch ducts 3 are directly connected to the pressure equalization chamber, which is the inner cavity of the air distribution static pressure box. When multiple branch ducts 3 are all connected to the pressure equalization chamber, the pressure values ​​at the inlets of the multiple branch ducts 3 are equal or differ very little, which can further ensure the reliability of obtaining the pressure values ​​at the inlets of multiple branch ducts 3 by detecting only one pressure value.

[0153] Furthermore, such as Figure 1 As shown, the air system includes a fresh air unit 5, with a fan 1 installed inside the fresh air unit 5. The fresh air unit 5 can be directly connected to the air distribution device 2 or connected through a pipeline, thereby achieving the purpose of delivering fresh air to each room.

[0154] Furthermore, the air system is installed indoors, and the outlets of multiple branch ducts 3 are respectively located in multiple rooms, so that fresh air can be delivered to the corresponding rooms through each branch duct 3.

[0155] Furthermore, the ventilation system also includes an air volume display device (not shown), which displays the air volume of each branch duct 3 in the ventilation state.

[0156] The features and advantages of the air volume detection method for the air system of the present invention are as follows:

[0157] I. The air volume detection method of this air system determines the air volume in the branch duct 3 by detecting the current value of the pressure parameter in the air system and combining the first correspondence between the preset working parameters of the fan 1 and the air volume of the fan 1, and the second correspondence between the air volume and the pressure parameter of the branch duct 3 under the independent ventilation state. This method does not require the installation of an air volume detection device on each branch duct 3, thus reducing the detection cost.

[0158] Second, in the air volume detection method of this air system, the pressure parameters of the air system can be detected at the location of the air distribution device 2 near the branch duct 3, so as to avoid pressure loss during the detection process and effectively improve the accuracy of air volume detection.

[0159] like Figure 1 As shown, the present invention provides a method for detecting the air volume of a wind system, wherein the wind system includes a fan 1, a wind distribution device 2 and multiple branch ducts 3 (e.g., L1, L2 and L3), the air outlet of the fan 1 is connected to the inlet of the wind distribution device 2, and the outlet of the wind distribution device 2 is connected to the multiple branch ducts 3.

[0160] like Figure 5 As shown, the airflow detection method of the present invention includes the following steps:

[0161] Step S1-2: Obtain the correspondence between the preset operating parameters of fan 1 and the air volume of fan 1;

[0162] Furthermore, step S1-2 specifically includes: obtaining the correspondence between the preset operating parameters of the fan 1 when it is running at one or more speeds and the air volume of the fan 1.

[0163] If only the preset operating parameters of the fan 1 at a certain speed are obtained, then only the air volume of each branch duct 3 under ventilation state at that speed of the fan 1 can be detected.

[0164] If the preset operating parameters of the fan 1 at multiple speeds are obtained, the air volume of each branch duct 3 under ventilation conditions can be detected when the fan 1 is at different speeds.

[0165] Step S2-2: Based on the correspondence between the preset operating parameters of the fan 1 and the air volume of the fan 1, obtain the air volume ratio or air resistance ratio between multiple branch ducts 3.

[0166] In an optional embodiment of the present invention, such as Figure 6 As shown, each branch duct 3 can be opened individually (only one branch duct 3 is in ventilation state in this step) to obtain the air volume ratio or air resistance ratio between each branch duct 3. Step S2-2 specifically includes:

[0167] Step S201-2: Control the multiple branch ducts 3 in the predetermined number of branch ducts 3 to be in a ventilation state individually;

[0168] The predetermined number of branch ducts 3 can be all the branch ducts 3 in the ventilation system (with attachments). Figure 1 For example, considering all three branch ducts L1, L2, and L3, when air needs to be supplied to all rooms, each branch duct 3 in the air system needs to be individually ventilated. Of course, the predetermined number of branch ducts 3 can also be a portion of all branch ducts 3 in the air system (as shown in the attached diagram). Figure 1 For example, any one or any two branch ducts of L1, L2 and L3 can be used to supply air to only some rooms. When only some rooms need to be supplied with air, it is only necessary to control each branch duct 3 connected to the room that needs to be supplied with air in the air system to be in ventilation state separately.

[0169] Step S202-2: Based on the correspondence between the preset operating parameters of the fan 1 and the air volume of the fan 1, obtain the air volume of each branch duct 3 in a predetermined number of individual ventilation states, to obtain the air volume ratio or air resistance ratio among multiple branch ducts 3. The air volume ratio among multiple branch ducts 3 can be obtained through the air resistance ratio. This method of obtaining the air volume ratio through the air resistance ratio of branch ducts 3 is applicable to branch ducts 3 of all lengths and diameters; the greater the air resistance, the smaller the air volume (air resistance and air volume are inversely proportional).

[0170] In an optional embodiment of the present invention, when the ventilation areas of multiple branch ducts 3 are the same or similar, the wind speed ratio between multiple branch ducts 3 can also be obtained according to the correspondence between the preset operating parameters of the fan 1 and the air volume of the fan 1.

[0171] Furthermore, the specific steps for determining the wind speed ratio among multiple branch ducts 3 include: First, controlling multiple branch ducts 3 in a predetermined number to be individually in a ventilation state; then, based on the correspondence between the preset operating parameters of the fan 1 and the air volume of the fan 1, obtaining the air volume of each branch duct 3 individually in a ventilation state, to obtain the wind speed ratio among multiple branch ducts 3. This method of determining the air volume ratio among multiple branch ducts 3 through the wind speed ratio is only applicable to branch ducts 3 with the same or similar ventilation areas. When the ventilation areas of each branch duct 3 are the same or similar, a higher wind speed results in a higher air volume (wind speed and air volume are directly proportional).

[0172] Furthermore, the air volume ratio among multiple branch ducts 3 specifically includes: the air volume ratio obtained when the fan 1 is running at one or more speeds and the branch duct 3 is in ventilation state alone.

[0173] If only the proportional relationship of the air volume of the branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at a certain speed, then only the air volume of each branch duct 3 in ventilation state when the fan 1 is running at that speed can be detected.

[0174] If the proportional relationship of the air volume of the branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at multiple speeds, then the air volume of each branch duct 3 in ventilation state can be detected when the fan 1 is running at different speeds.

[0175] Furthermore, the wind resistance ratio among multiple branch ducts 3 specifically includes: the wind resistance ratio of branch ducts 3 when they are individually in ventilation state, obtained when the fan 1 is running at one or more speeds.

[0176] If only the proportional relationship of the wind resistance of the branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at a certain speed, then only the air volume of each branch duct 3 in ventilation state can be detected when the fan 1 is running at that speed.

[0177] If the proportional relationship of the wind resistance of the branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at multiple speeds, then the air volume of each branch duct 3 in ventilation state can be detected at different speeds of the fan 1.

[0178] Furthermore, the wind speed ratio among multiple branch ducts 3 specifically includes: when the diameter and length of multiple branch ducts 3 are the same, the wind speed ratio of each branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at one or more speeds.

[0179] If only the proportional relationship of the wind speed of the branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at a certain speed, then only the air volume of each branch duct 3 in ventilation state can be detected when the fan 1 is running at that speed.

[0180] If the proportional relationship of the wind speed of the branch duct 3 when it is in ventilation state is obtained when the fan 1 is running at multiple speeds, then the air volume of each branch duct 3 in ventilation state can be detected at different speeds of the fan 1.

[0181] In another alternative embodiment of the invention, such as Figure 1 As shown, each branch duct 3 includes at least one first branch duct L1 and at least one second branch duct L2; the airflow ratio or air resistance ratio between the branch ducts 3 can be obtained by sequentially opening each branch duct 3 (in this step, only the branch duct 3 opened for the first time is in a separate ventilation state, and when other branch ducts 3 are opened again, the branch duct 3 opened first always remains in a ventilation state). Step S2-2 specifically includes:

[0182] Step S201-2': Control the first branch duct L1 in the multiple branch ducts 3 to be in ventilation state alone, and obtain the correspondence between the air volume of the first branch duct L1 and the preset working parameters of the fan 1;

[0183] Step S202-2': Keep at least one first branch duct L1 in a ventilated state, and open at least one second branch duct L2 separately;

[0184] Step S203-2': Obtain the current value of the preset operating parameters of the fan 1, and obtain the current value of the air volume of the first branch duct L1 according to the obtained current value of the preset operating parameters of the fan 1 and the correspondence between the air volume of the first branch duct L1 and the preset operating parameters of the fan 1.

[0185] Step S204-2': Based on the current value of the preset operating parameters of fan 1 and the correspondence between the preset operating parameters of fan 1 and the air volume of fan 1, obtain the current value of the air volume of fan 1.

[0186] Step S205-2': Based on the current value of the air volume of fan 1 and the current value of the air volume of the first branch duct L1, obtain the current value of the air volume of the second branch duct L2. The current value of the air volume of the second branch duct L2 can be obtained by subtracting the current value of the air volume of the first branch duct L1 from the current value of the air volume of fan 1.

[0187] Step S206-2': Based on the current air volume values ​​of the first branch duct L1 and the second branch duct L2, obtain the air volume ratio or air resistance ratio between the first branch duct L1 and the second branch duct L2.

[0188] Furthermore, such as Figure 1 As shown, each branch duct 3 also includes at least one third branch duct L3, and after step S206-2', it further includes:

[0189] Step S207-2': Keep both the first branch duct L1 and the second branch duct L2 in a ventilated state, and open at least one third branch duct L3 separately;

[0190] Step S208-2': Based on the current value of the air volume of the first branch duct L1, the air volume ratio or air resistance ratio between the first branch duct L1 and the second branch duct L2, and the current value of the air volume of the fan 1, obtain the current value of the air volume of the third branch duct L3.

[0191] Specifically, based on the current air volume of the first branch duct L1 and the air volume ratio or air resistance ratio between the first branch duct L1 and the second branch duct L2, the current air volume of the second branch duct L2 can be obtained; by subtracting the current air volume of the first branch duct L1 and the current air volume of the second branch duct L2 from the current air volume of the fan 1, the current air volume of the third branch duct L3 can be obtained.

[0192] Step S209-2': Based on the current air volume values ​​of the first branch duct L1, the second branch duct L2, and the third branch duct L3, obtain the air volume ratio or air resistance ratio among the first branch duct L1, the second branch duct L2, and the third branch duct L3.

[0193] Step S3-2: Obtain the ventilation status of multiple branch ducts 3 when the air system is working normally;

[0194] Step S4-2: Based on the air volume ratio or air resistance ratio of the branch duct 3 in the ventilated state and the current value of the air volume of the fan 1, obtain the air volume of the branch duct 3 in the ventilated state.

[0195] Furthermore, such as Figure 7 As shown, step S4-2 specifically includes:

[0196] Step S401-2: Obtain the current value of the air volume of fan 1;

[0197] Step S402-2: Based on the air volume ratio or air resistance ratio between the branch ducts 3 in the ventilated state, the current value of the air volume is proportionally allocated to obtain the air volume of the branch ducts 3 in the ventilated state.

[0198] Specifically, when multiple branch ducts 3 are in a ventilated state, the current airflow of fan 1 can be obtained based on the current preset operating parameters of fan 1 and the pre-obtained correspondence between the preset operating parameters of fan 1 and the airflow of fan 1. Alternatively, the current airflow of fan 1 can be determined by collecting the current pressure parameter at the air distribution device 2. Alternatively, an airflow detection device can be installed at the air outlet of fan 1, the air distribution device 2, or the flow channel between the air outlet of fan 1 and the air distribution device 2 to collect the total airflow in the air system in real time (i.e., the current airflow of fan 1). The obtained current airflow of fan 1 is then proportionally distributed according to a pre-obtained ratio (i.e., the ratio of airflow to airflow or the ratio of air resistance in each branch duct 3 under ventilated conditions), thereby obtaining the airflow of each branch duct 3 in a ventilated state.

[0199] In an optional embodiment of the present invention, such as Figure 1 As shown, the air system also includes multiple flow control devices 4, each of which is respectively installed on the corresponding branch duct 3 or the air distribution device 2. In step S2-2, the specific operation of controlling each branch duct 3 in the predetermined number of branch ducts 3 to be in a ventilation state individually includes: individually controlling the flow control device 4 corresponding to each branch duct 3 to be in an open state, so that each branch duct 3 in the predetermined number of branch ducts 3 can be in a ventilation state individually.

[0200] Furthermore, in step S3-2, the specific operational steps for obtaining the ventilation status of multiple branch ducts 3 when the air system is operating normally include: obtaining the on / off status of each corresponding branch duct 3 by acquiring the on / off status of multiple flow control devices 4. When the flow control device 4 is in the open state, the corresponding branch duct 3 is in the ventilation state; when the flow control device 4 is in the closed state, the corresponding branch duct 3 is in the disconnected state.

[0201] In an optional embodiment of the present invention, the preset operating parameters of the fan 1 include: the current value I of the fan 1, or the pressure difference ΔP between the air inlet and the air outlet of the fan 1, or the pressure value P of the fan 1 (which may be the pressure value at the air outlet of the fan 1, or the pressure value at the air distribution device 2, or the pressure value at the flow channel between the air outlet of the fan 1 and the air distribution device 2, or the pressure value at the connection between the air distribution device 2 and one of the multiple branch ducts 3). Of course, it can also be any two or a combination of any three parameters among the current value I, the pressure difference ΔP, and the pressure value P. The preset operating parameters of the fan 1 are parameters already determined by the fan 1 itself; each rotational speed of the fan 1 corresponds to a determined preset operating parameter and the corresponding airflow.

[0202] In an optional embodiment of the present invention, such as Figure 1 As shown, the air system also includes a pressure detection device 6. The pressure detection device 6 is located at the air outlet of the fan 1, the air distribution device 2, or the flow channel between the air outlet of the fan 1 and the air distribution device 2. The pressure detection device 6 is used to detect the pressure value at the air outlet of the fan 1, the air distribution device 2, the flow channel between the air outlet of the fan 1 and the air distribution device 2, or the connection point between the air distribution device 2 and one of the multiple branch ducts 3. Since the air distribution device 2 is closest to the branch duct 3, the accuracy of the detected pressure value is highest when the pressure detection device 6 is located at the air distribution device 2.

[0203] Furthermore, such as Figure 1 As shown, the pressure detection device 6 includes a wind pressure sensor.

[0204] Furthermore, such as Figure 1 As shown, the flow control device 4 includes an air valve.

[0205] Furthermore, such as Figure 1 As shown, the air distribution device 2 includes a pressure equalization chamber, and multiple branch ducts 3 are directly connected to the pressure equalization chamber, which is the inner cavity of the air distribution static pressure box. Under this connection method, the air volume ratio or air resistance ratio among the multiple branch ducts 3 does not change or changes very little with the change of the opening and closing state of the multiple branch ducts 3.

[0206] Furthermore, such as Figure 1 As shown, the air system includes a fresh air unit 5, with a fan 1 installed inside the fresh air unit 5. The fresh air unit 5 can be directly connected to the air distribution device 2 or connected through a pipeline, thereby achieving the purpose of delivering fresh air to each room.

[0207] Furthermore, the air system is installed indoors, and the outlets of multiple branch ducts 3 are respectively located in multiple rooms, so that fresh air can be delivered to the corresponding rooms through each branch duct 3.

[0208] Furthermore, the ventilation system also includes an air volume display device (not shown), which displays the air volume of each branch duct 3 in the ventilation state.

[0209] The features and advantages of the air volume detection method for the air system of the present invention are as follows:

[0210] The air volume detection method of this air system detects the current air volume of the fan 1 and combines it with the pre-acquired air volume ratio or air resistance ratio between each branch duct 3. The current air volume can be distributed according to the ratio, without the need to install an air volume detection device on each branch duct 3, which effectively improves detection efficiency and reduces detection costs.

[0211] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for detecting air volume in a ventilation system, characterized in that, The air system includes a fan, an air distribution device, and multiple branch ducts. The air system is installed indoors, and the outlets of the multiple branch ducts are respectively located in multiple rooms. The air outlet of the fan is connected to the inlet of the air distribution device, and the outlet of the air distribution device is connected to the multiple branch ducts. The air volume detection method includes: Obtain the first correspondence between the preset operating parameters of the fan and the air volume of the fan; The step of obtaining the first correspondence includes: obtaining the correspondence between the preset operating parameters and the air volume of the fan when the fan is running at one or more speeds, as the first correspondence; Based on the first correspondence, a second correspondence between the air volume and pressure parameters of at least one branch duct is obtained. The pressure parameters include the pressure value at the air outlet of the fan, the air distribution device, the flow channel between the air outlet of the fan and the air distribution device, or the connection between the air distribution device and one of the branch ducts. The step of obtaining the second correspondence between the air volume and pressure parameters of at least one branch duct includes: Each of the predetermined number of branch ducts is individually in a ventilation state; Based on the first correspondence and the value of the preset working parameter, the air volume of the branch duct in the ventilation state is obtained, and the pressure parameter is obtained, forming a second correspondence between the air volume of the branch duct in the ventilation state and the pressure parameter. Obtain the ventilation status of multiple branch ducts when the air system is operating normally; Based on the second correspondence that matches the branch duct in the ventilated state and the current value of the pressure parameter corresponding to the ventilated state, the air volume of the branch duct in the ventilated state is obtained in real time. The step of acquiring the air volume of the branch duct in real time under the ventilation state includes: Obtain the current value of the pressure parameter; The current value of the pressure parameter is substituted into the second correspondence that matches the branch duct in the ventilated state to obtain the air volume of the branch duct in the ventilated state.

2. The air volume detection method for a wind system according to claim 1, characterized in that, The second correspondence includes the correspondence between the air volume of the branch duct in ventilation state obtained when the fan is running at one or more speeds and the pressure parameter.

3. The air volume detection method for a wind system according to claim 1, characterized in that, The air system also includes multiple flow control devices, which are installed on the branch ducts or the air distribution devices; The step of controlling each of the predetermined number of branch ducts to be in an individual ventilation state specifically includes: individually controlling the flow control device corresponding to each branch duct to be in an open state.

4. The air volume detection method for a wind system according to claim 1, characterized in that, The air system also includes multiple flow control devices, which are installed on the branch ducts or the air distribution devices; The step of obtaining the ventilation status of the multiple branch ducts when the air system is working normally specifically includes: obtaining the opening and closing status of the multiple flow control devices.

5. The air volume detection method for a wind system according to any one of claims 1 to 4, characterized in that, The preset operating parameters of the fan include one or a combination of the following: The current value of the fan, The pressure difference between the air inlet and outlet of the fan, The pressure value at the air outlet of the fan, or at the air distribution device, or at the flow channel between the air outlet of the fan and the air distribution device, or at the connection point between the air distribution device and one of the branch ducts.

6. The air volume detection method for a wind system according to any one of claims 1 to 4, characterized in that, The air system also includes a pressure detection device, which is located at the air outlet of the fan, the air distribution device, or the flow channel between the air outlet of the fan and the air distribution device, and measures the pressure value at the air outlet of the fan, the air distribution device, the flow channel between the air outlet of the fan and the air distribution device, or the connection point between the air distribution device and one of the branch ducts.

7. The air volume detection method for a wind system according to claim 3 or 4, characterized in that, The flow control device includes an air valve.

8. The air volume detection method according to any one of claims 1 to 4, characterized in that, The air distribution device includes a pressure equalization chamber, and multiple branch ducts are directly connected to the pressure equalization chamber.

9. The air volume detection method according to any one of claims 1 to 4, characterized in that, The air system includes a fresh air unit, which is installed inside the fresh air unit. The fresh air unit is directly connected to the air distribution device or connected through a pipeline.

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