Air system balance debugging method and device based on constant static pressure method

Abstract

The invention discloses an air system balance debugging method and device based on a constant static pressure method, and the device comprises a control device, a frequency converter, an air pipe air static pressure sensor, an air volume meter and a communication line, and the air pipe air static pressure sensor and the air volume instrument are respectively connected with the input end of the control device through communication lines. According to the invention, the control device is adopted to drive the fan to perform variable-frequency regulation, so that the manual regulation times and the air volume measurement times are reduced, and the precision and consistency are high; most times, the controller drives the fan to perform frequency conversion, the manual adjustment frequency of the valve is reduced, the measurement frequency of the air volume is reduced, and the workload is greatly reduced; the problems of repeatedly measuring the air volume of the same air port and repeatedly adjusting the same air valve are solved, operation steps are reduced, workload is reduced, and debugging time is saved; by arranging a complete set of automatic control and measurement device, manual operation is reduced, and accuracy and consistency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind system balance debugging, and in particular to a wind system balance debugging method and device based on a constant static pressure method. Background Art

[0002] The energy consumption of building operation accounts for about 20% of the total energy consumption in the country. In the context of dual carbon, building energy conservation has attracted more and more social attention. Hydraulic balance has a vital impact on the normal operation, energy efficiency, comfort and economy of the HVAC system. Hydraulic balance can ensure that each terminal device in the HVAC system obtains the designed flow under the designed conditions, avoids the occurrence of large flow, small temperature difference and high energy consumption conditions caused by hydraulic imbalance, and ensures uniform and comfortable indoor temperature. Common wind system balance debugging methods include: (1) proportional flow method, (2) reference air outlet debugging method and other methods. Common instruments used for wind system balance debugging include: air volume hood, handheld anemometer, electronic micromanometer, L-type pitot tube, clamp ammeter, tachometer, etc.

[0003] However, the above methods have the following problems: (1) Since the air volume of each air outlet is affected by the air outlets next to it, the same air valve needs to be adjusted multiple times, and the air volume measurement of the same air outlet needs to be performed multiple times, which requires a lot of human resources. (2) The debugging process depends on the experience of the personnel. Most of the instruments used are manually operated and read. The operation process is cumbersome, and the readings are subject to human errors or irregular operations. The accuracy and consistency of the debugging results are poor. (3) The debugging cycle is long. Traditional debugging methods often require manual measurement of the air flow data of each air outlet, fan and duct, and adjustment and correction. The process is cumbersome and time-consuming. Especially in large air conditioning systems, balanced debugging may take several days to weeks, which is unacceptable in modern fast-paced projects. Summary of the invention

[0004] The object of the present invention is to provide a wind system balance debugging method and device based on the constant static pressure method to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wind system balancing and debugging device based on the constant static pressure method, comprising a control device, a frequency converter, a duct air static pressure sensor, an air volume meter and a communication line, wherein the frequency converter is connected to the output end of the control device via the communication line, and the duct air static pressure sensor and the air volume meter are respectively connected to the input end of the control device via the communication line.

[0006] Preferably, the frequency converter, the duct air static pressure sensor and the air volume meter are respectively connected to the control device via a wireless communication module.

[0007] Preferably, the control device includes a controller, a power supply, an indicator light and a human-computer interaction module.

[0008] A wind system balancing and debugging method based on a constant static pressure method uses the wind system balancing and debugging device based on a constant static pressure method; and comprises the following steps:

[0009] S1. Preparation: Draw a schematic diagram of the air system to be debugged, and mark the numbers of the air outlets and air valves, and the designed air volume of each air outlet; input the air volume and number of the above air outlets into the control device; determine the position and number of the most hydraulically unfavorable air outlet according to the design drawings and calculation data;

[0010] S2. Preparation and installation of instruments: Connect the frequency converter to the fan power supply and use the frequency converter to power the fan; install the duct air static pressure sensor in the branch duct of the most hydraulically unfavorable vent; cover the air volume meter on the most hydraulically unfavorable vent; adjust the communication between the frequency converter, duct air static pressure sensor, and air volume meter; close the air valves in front of most vents;

[0011] S3. Fully open the air valve in front of the most hydraulically unfavorable air outlet, the air valve on the branch main pipe, and the air valve at the fan outlet, measure the air volume of the air outlet with an air volume meter, and manually adjust the output frequency of the inverter using the human-machine interaction module of the control device until the detected air volume of the most hydraulically unfavorable air outlet is consistent with the designed air volume, and record the static pressure in the air duct in front of the most hydraulically unfavorable air outlet at this time; the indicator light of the control device lights up green;

[0012] S4. Input the static pressure value recorded in S3 into the control device through the human-computer interaction module and use it as the control target value of the controller to automatically control the output frequency of the frequency converter. Move the air volume meter to the hydraulically most unfavorable air outlet of the branch where the S3 measuring air outlet is located, except for the air outlet, and measure the air volume of the air outlet. Adjust the air valve in front of the measured air outlet until the detected air volume of the measured air outlet is the same as the designed air volume, and the indicator light of the control device lights up green; fix the valve position of the air valve and make a mark;

[0013] S5. Move the air volume meter in the direction close to the fan, measure the air volume of the branch outlets in turn, adjust the air valve position in front of the outlets, fix the air valve position when the indicator light is on, and mark it; after completion, move the air volume meter to the next outlet until all outlets of the branch reach the designed air volume;

[0014] S6, move the static pressure sensor 3 and the air volume meter to the next branch, and repeat S3-S5; until the debugging of all branch air ducts is completed;

[0015] S7, move the static pressure sensor 3 to the air duct in front of the most hydraulically unfavorable air outlet, fully open the valve on the main pipe of this branch pipeline, and close the valves of other branch pipelines; input the static pressure value recorded in S3 into the control device through the human-computer interaction module, and use it as the control target value of the controller to automatically control the output frequency of the inverter, and use the air volume meter to check the operating air volume of the most hydraulically unfavorable air outlet. If the test air volume is consistent with the design air volume, the indicator light turns green; if not, fine-tune the air valve on the main pipe of the branch pipeline until the indicator light turns green; fix the valve position of the air valve and make a mark;

[0016] S8. Move the air volume meter to any air outlet on the next air duct branch in the direction close to the fan, and adjust the air valve on the main pipe of the branch until the air volume of the measured air outlet of the branch is consistent with the designed air volume, and the indicator light turns green; fix the valve position of the air valve and mark it;

[0017] S9, repeat S8 until all branches are debugged;

[0018] S10. Connect the fan to the original power supply, operate the fan at the industrial frequency, and adjust the fan outlet air valve until the last measured air volume is consistent with the designed air volume, and the green light comes on; fix the fan outlet air valve position and mark it;

[0019] S11. Remove the air duct static pressure sensor and air volume meter to complete the wind balance debugging of the air system.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. High automation program: The control device is used to drive the fan frequency conversion adjustment, which reduces the number of manual adjustments and air volume measurements, with high accuracy and consistency.

[0022] 2. Fewer manual adjustments: Most of the time, the fan frequency conversion is driven by the controller, which reduces the number of manual adjustments of the valve and the number of air volume measurements, greatly reducing the workload.

[0023] 3. Less workload and time saving: It solves the problem of repeatedly measuring the air volume of the same air outlet and repeatedly adjusting the same air valve, reduces the operating steps, reduces the workload, and saves debugging time.

[0024] 4. High precision and good consistency: By setting up a complete set of automatic control and measuring devices, manual operation can be reduced and accuracy and consistency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a specific flow chart of the present invention.

[0028] In the figure: 1. Control device; 2. Frequency converter; 3. Duct air static pressure sensor; 4. Air volume meter; 5. Communication line. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0030] See also Figure 1 In an embodiment of the present invention, a wind system balancing and debugging device based on a constant static pressure method includes a control device 1, a frequency converter 2, a duct air static pressure sensor 3, an air volume meter 4 and a communication line 5. The frequency converter 2 is connected to the output end of the control device 1 through the communication line 5, and the duct air static pressure sensor 3 and the air volume meter 4 are respectively connected to the input end of the control device 1 through the communication line 5; the control device 1 includes a controller, a power supply, an indicator light and a human-computer interaction module.

[0031] The frequency converter 2, the duct air static pressure sensor 3 and the air volume meter 4 are respectively connected to the control device 1 through a wireless communication module.

[0032] The controller memory in the control device 1 stores a feedback control program using the proportional-integral method, with the static pressure at the most hydraulically unfavorable point in the air duct of the wind system as the control variable; the debugging personnel can input the duct static pressure setting value, the number of each air outlet in the system and the design air volume value into the control device through the human-computer interaction module, and store them in the controller memory, and can manually change the output frequency of the inverter 2; the human-computer interaction module can display the measured air volume and the design air volume of the air outlet of the air volume meter 4, the setting value and the measured value of the air duct air static pressure sensor 3, and the design value and actual value of the output frequency of the inverter 2; the indicator light feedback can be used to detect whether the air volume is consistent with the design air volume. If the detected air volume of the air outlet with a given number is consistent with the design air volume value, the indicator light lights up green.

[0033] A wind system balancing and debugging method based on a constant static pressure method uses the wind system balancing and debugging device based on a constant static pressure method; and comprises the following steps:

[0034] S1. Preparation: Draw a schematic diagram of the air system to be debugged, and mark the numbers of the air outlets and air valves, and mark the design air volume of each air outlet; and input the air volume and number of the above air outlets into the control device 1; determine the position and number of the most hydraulically unfavorable air outlet according to the design drawings and calculation data;

[0035] S2. Preparation and installation of instruments: Connect the frequency converter 2 to the fan power supply and use the frequency converter 2 to power the fan; install the duct air static pressure sensor 3 in the branch duct of the hydraulically most unfavorable vent; cover the air volume meter 4 on the hydraulically most unfavorable vent; adjust the communication between the frequency converter 2, the duct air static pressure sensor 3, and the air volume meter 4; close the air valves in front of most vents;

[0036] S3. Fully open the air valve in front of the most hydraulically unfavorable air outlet, the air valve on the branch main pipe, and the air valve at the fan outlet, measure the air volume of the air outlet with the air volume meter 4, and manually adjust the output frequency of the inverter 2 using the human-machine interaction module of the control device 1 until the detected air volume of the most hydraulically unfavorable air outlet is consistent with the designed air volume, and record the static pressure in the air duct in front of the most hydraulically unfavorable air outlet at this time; the indicator light of the control device 1 lights up green;

[0037] S4, input the static pressure value recorded in S3 into the control device 1 through the human-computer interaction module, and use it as the control target value of the controller, automatically control the output frequency of the frequency converter 2, move the air volume meter 4 to the hydraulically most unfavorable air outlet of the branch where the S3 measuring air outlet is located, and measure the air volume of the air outlet, adjust the air valve in front of the measured air outlet, until the detected air volume of the measured air outlet is the same as the designed air volume, and the indicator light of the control device 1 lights up green; fix the valve position of the air valve and make a mark;

[0038] S5. Move the air volume meter 4 in the direction close to the fan, measure the air volume of the branch outlet in turn, adjust the air valve position in front of the outlet, fix the air valve position when the indicator light is on, and mark it; after completion, move the air volume meter 4 to the next outlet until all outlets of the branch reach the designed air volume;

[0039] S6, move the static pressure sensor 3 and the air volume meter 4 to the next branch, and repeat S3-S5; until the debugging of all branch air ducts is completed;

[0040] S7, move the static pressure sensor 3 to the air duct in front of the most hydraulically unfavorable air outlet, fully open the valve on the main pipe of this branch pipeline, and close the valves of other branch pipelines; input the static pressure value recorded in S3 into the control device 1 through the human-computer interaction module, and use it as the control target value of the controller to automatically control the output frequency of the inverter 2, and use the air volume meter 4 to check the operating air volume of the most hydraulically unfavorable air outlet. If the test air volume is consistent with the design air volume, the indicator light turns green; if not, fine-tune the air valve on the main pipe of the branch pipeline until the indicator light turns green; fix the valve position of the air valve and make a mark;

[0041] S8. Move the air volume meter 4 to any air outlet on the next air duct branch in the direction close to the fan, and adjust the air valve on the main pipe of the branch until the air volume of the measured air outlet of the branch is consistent with the designed air volume, and the indicator light turns green; fix the valve position of the air valve and mark it;

[0042] S9, repeat S8 until all branches are debugged;

[0043] S10. Connect the fan to the original power supply, operate the fan at the industrial frequency, and adjust the fan outlet air valve until the last measured air volume is consistent with the designed air volume, and the green light comes on; fix the fan outlet air valve position and mark it;

[0044] S11, remove the air duct static pressure sensor 3 and the air volume meter 4 to complete the wind balance debugging of the wind system.

[0045] Specific:

[0046] A wind system balance debugging method based on a constant static pressure method comprises the following steps:

[0047] S1. Preparation: Draw a schematic diagram of the air system to be debugged, and mark the numbers of the air outlets and air valves, as shown in the figure above; mark the design air volume of each air outlet; and input the air volume and number of the above air outlets into the control device 1; determine that the most hydraulically unfavorable air outlet is G33 according to the design drawings and calculation data;

[0048] S2. Preparation and installation of instruments: Connect the inverter 2 to the air conditioning box or the fan power supply, and use the inverter to power the fan; install the duct air static pressure sensor 3 at point P3; cover the air volume meter 4 on the hydraulic G33 air outlet; and adjust the communication between the inverter 2, the duct air static pressure sensor 3, the air volume meter 4 and the control device 1; turn off V11, V12, V13, V21, V22 and V23;

[0049] S3, adjust V33, V3 and V0 to the fully open state, measure the air volume of G33 with the air volume meter 4, and manually adjust the output frequency of the inverter 2 using the human-computer interaction module of the control device 1 until the actual air volume of G33 is consistent with the designed air volume, and record the static pressure at point P3 at this time; the indicator light of the control device 1 lights up green;

[0050] S4, input the static pressure value of point P3 recorded in step S3 into the control device 1 through the human-computer interaction module, and use it as the control target value of the controller to automatically control the output frequency of the frequency converter 2 to maintain the static pressure value of point P3 unchanged; move the air volume meter 4 to the G32 air outlet, measure the air volume at the air outlet, adjust the air valve V32 until the G32 air volume is the same as the design air volume, and the indicator light of the control device 1 lights up green; fix the valve position of the air valve V32 and make a mark;

[0051] S5. Move the air volume meter 4 to the air outlet G31, adjust the air valve V31, and when the indicator light is on, fix the valve position of the air valve V31 and make a mark;

[0052] S6, move the duct air static pressure sensor 3 and the air volume meter 4 to the second branch, install the duct air static pressure sensor 3 at point P2, and install the air volume meter 4 at the air outlet G23;

[0053] Close the air valve V3, adjust the air valves V2 and V23 to fully open, manually adjust the output frequency of inverter 2 until the test air volume of G23 is consistent with the design air volume, and record the static pressure value at point P2;

[0054] The static pressure value at point P2 is input into the control device 1, and the static pressure value at point P2 is used as the control variable to control the output frequency of the frequency converter 2 so that the static pressure value at point P2 remains unchanged at the input value;

[0055] Move the air volume meter 4 to the air outlet G22, and adjust the valve position of the air valve V22 until the measured air volume at the air outlet G22 is consistent with the designed air volume, and the indicator light turns green;

[0056] Move the air volume meter 4 to the air outlet G21, and adjust the valve position of the air valve V21 until the measured air volume at the air outlet G21 is consistent with the designed air volume, and the indicator light turns green;

[0057] Move the duct air static pressure sensor 3 and air volume meter 4 to the first branch, install the duct air static pressure sensor 3 at point P1, and install the air volume meter 4 at the air outlet G13;

[0058] Close air valve V2 and fully open air valves V1 and V13; manually adjust the output frequency of inverter 2 until the test air volume of G13 is consistent with the design air volume, and record the static pressure value at point P1;

[0059] The static pressure value at point P1 is input into the control device 1, and the static pressure value at point P1 is used as a control variable to control the output frequency of the frequency converter 2 so that the static pressure value at point P1 remains unchanged at the input value;

[0060] Move the air volume meter 4 to the air outlet G12, and adjust the valve position of the air valve V12 until the measured air volume at the air outlet G12 is consistent with the designed air volume, and the indicator light turns green;

[0061] Move the air volume meter 4 to the air outlet G11, and adjust the valve position of the air valve V11 until the measured air volume at the air outlet G11 is consistent with the designed air volume, and the indicator light turns green;

[0062] S7, move the duct air static pressure sensor 3 to the P3 position, fully open valves V0 and V3, and close valves V1 and V2; input the static pressure value at point P3 recorded in step S3 into the control device 1 through the human-computer interaction module, and use it as the control target value of the controller to automatically control the output frequency of the inverter 2 to maintain the measured static pressure value at point P1 unchanged;

[0063] S8. Move the air volume meter 4 to G21 and adjust V2 until the measured air volume of G21 is consistent with the designed air volume and the indicator light turns green; fix the position of the V2 air valve and mark it;

[0064] S9, move the air volume meter 4 to G11, adjust V1 until the measured air volume of G11 is consistent with the designed air volume, and the indicator light turns green; fix the position of the V1 air valve and mark it;

[0065] S10, connect the fan back to the original power supply, run the fan at industrial frequency, adjust the fan outlet air valve V0 until the measured air volume of G11 is consistent with the designed air volume, and the green light comes on; fix the valve position of the fan outlet air valve V0 and mark it;

[0066] S11, remove the air duct static pressure sensor 3 and the air volume meter 4 to complete the wind balance debugging of the wind system.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind system balancing and debugging device based on the constant static pressure method, characterized in that: The invention comprises a control device (1), a frequency converter (2), a duct air static pressure sensor (3), an air volume meter (4) and a communication line (5), wherein the frequency converter (2) is connected to the output end of the control device (1) via the communication line (5), and the duct air static pressure sensor (3) and the air volume meter (4) are respectively connected to the input end of the control device (1) via the communication line (5).

2. The wind system balancing and debugging device based on the constant static pressure method according to claim 1 is characterized in that: The frequency converter (2), the air duct air static pressure sensor (3) and the air volume meter (4) are respectively connected to the control device (1) via a wireless communication module.

3. A wind system balancing and debugging device based on the constant static pressure method according to claim 1 or 2, characterized in that: The control device (1) comprises a controller, a power supply, an indicator light and a human-computer interaction module.

4. A wind system balance debugging method based on the constant static pressure method, characterized in that: A wind system balancing and debugging device based on a constant static pressure method according to claim 3 is used; comprising the following steps: S1. Preparation: Draw a schematic diagram of the air system to be debugged, and mark the numbers of the air outlets and air valves, and the design air volume of each air outlet; input the air volume and number of the above air outlets into the control device (1); determine the position and number of the most hydraulically unfavorable air outlet based on the design drawings and calculation data; S2. Preparation and installation of instruments: connect the frequency converter (2) to the fan power supply and use the frequency converter (2) to power the fan; install the duct air static pressure sensor (3) in the branch duct of the hydraulically most unfavorable air outlet; cover the air volume meter (4) on the hydraulically most unfavorable air outlet; adjust the communication between the frequency converter (2), the duct air static pressure sensor (3), and the air volume meter (4); S3, fully open the air valve in front of the most hydraulically unfavorable air outlet, the air valve on the branch main pipe, and the air valve at the fan outlet, measure the air volume of the air outlet with an air volume meter (4), and manually adjust the output frequency of the frequency converter (2) using the human-machine interaction module of the control device (1) until the detected air volume of the most hydraulically unfavorable air outlet is consistent with the designed air volume, and record the static pressure in the air duct in front of the most hydraulically unfavorable air outlet at this time; the indicator light of the control device (1) lights up green; S4, input the static pressure value recorded in S3 into the control device (1) through the human-computer interaction module and use it as the control target value of the controller to automatically control the output frequency of the frequency converter (2), move the air volume meter (4) to the hydraulically most unfavorable air outlet of the branch where the air outlet of S3 is located, except for the air outlet, and measure the air volume of the air outlet, adjust the air valve in front of the measured air outlet until the detected air volume of the measured air outlet is the same as the designed air volume, and the indicator light of the control device (1) lights up green; fix the valve position of the air valve and make a mark; S5. Move the air volume meter (4) in the direction close to the fan, measure the air volume of the branch outlets in turn, adjust the valve position of the air valve in front of the outlets, fix the valve position of the air valve when the indicator light is on, and mark it; after completion, move the air volume meter (4) to the next outlet until all outlets of the branch reach the designed air volume; S6, move the static pressure sensor 3 and the air volume meter (4) to the next branch, and repeat S3-S5; until the debugging of all branch air ducts is completed; S7, move the static pressure sensor 3 to the air duct in front of the most hydraulically unfavorable air outlet, fully open the valve on the main pipe of this branch pipe, and close the valves of other branch pipes; input the static pressure value recorded in S3 into the control device (1) through the human-computer interaction module, and use it as the control target value of the controller to automatically control the output frequency of the frequency converter (2), and use the air volume meter (4) to check the operating air volume of the most hydraulically unfavorable air outlet. If the test air volume is consistent with the design air volume, the indicator light turns green; if not, fine-tune the air valve on the main pipe of the branch pipe until the indicator light turns green; fix the valve position of the air valve and make a mark; S8. Move the air volume meter (4) to any air outlet on the next air duct branch in the direction close to the fan, and adjust the air valve on the main pipe of the branch until the air volume at the measured air outlet of the branch is consistent with the designed air volume and the indicator light turns green; fix the valve position of the air valve and mark it; S9, repeat S8 until all branches are debugged; S10. Connect the fan to the original power supply, operate the fan at the industrial frequency, and adjust the fan outlet air valve until the last measured air volume is consistent with the designed air volume, and the green light comes on; fix the fan outlet air valve position and mark it; S11, remove the air duct static pressure sensor (3) and the air volume meter (4), and complete the wind balance debugging of the wind system.

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