Variable-static-pressure variable-air-volume energy-saving ventilation system

Abstract

The invention discloses a variable-static-pressure variable-air-volume energy-saving ventilation system. Comprising a ventilation fan, a PLC control box, a first air volume sensor, a second air volume sensor, a third air volume sensor, a fourth air volume sensor, a static pressure sensor, a first electric switching value air valve, a second electric switching value air valve, a third electric switching value air valve, a fourth electric switching value air valve, a fifth electric switching value air valve, a sixth electric switching value air valve and a seventh electric switching value air valve. The set static pressure value of the fan can be adaptively adjusted according to the air pressure value actually required by the ventilation system under different air volume scenes, the additional output energy consumption of the fan caused by constant static pressure control is reduced, and the energy utilization rate of the ventilation system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial ventilation, and in particular to a variable static pressure and variable air volume energy-saving ventilation system suitable for ventilation scenes with complex pipe networks. Background Art

[0002] With the development needs of various domestic industries, higher requirements are placed on the wind pressure values ​​of HVAC systems in various special industrial scenarios. For example, in clean environments such as pharmaceutical factories, experimental animal breeding, microbiology laboratories, and semiconductor workshops, the total pressure values ​​of the fans supporting the ventilation systems are mostly between 1000 and 2000 Pa, and the motor power of the fans is often relatively high.

[0003] At present, the "fixed static pressure variable air volume design" is generally used in ventilation application scenarios with changing air volume, that is, a static pressure sensor is set at the starting end of the main air duct or at the most unfavorable point of the system air pressure. When the air volume of the ventilation system changes, it will cause the system static pressure value to change. The fan control system collects the real-time value of the static pressure sensor and compares it with the set static pressure value. When the real-time static pressure value is lower than the set static pressure value, the fan control system will increase the fan operation frequency; when the real-time static pressure value is higher than the set static pressure value, the fan control system will reduce the fan operation frequency.

[0004] The above approach can reduce the fan operating frequency when the actual air volume of the ventilation system is lower than the design air volume value, which is one of the common energy-saving measures. According to the air duct resistance calculation formula: When the actual air volume of the ventilation system decreases, the wind speed V will decrease accordingly, and other parameters that affect the duct resistance value remain unchanged, so the duct system resistance will decrease accordingly, and the output air pressure value required by the fan will also decrease accordingly. However, the core logic of the static pressure control is to maintain the static pressure value of the fan unchanged, which will inevitably lead to the actual output static pressure value of the fan being higher than the ventilation system requirement, resulting in energy waste. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a variable static pressure and variable air volume energy-saving ventilation system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The present invention provides a variable static pressure and variable air volume energy-saving ventilation system, comprising:

[0008] Ventilation fans;

[0009] PLC control box;

[0010] Air volume sensor No. 1, air volume sensor No. 2, air volume sensor No. 3, air volume sensor No. 4;

[0011] Static pressure sensor;

[0012] No. 1 electric on / off air measuring valve, No. 2 electric on / off air measuring valve, No. 3 electric on / off air measuring valve, No. 4 electric on / off air measuring valve, No. 5 electric on / off air measuring valve, No. 6 electric on / off air measuring valve, No. 7 electric on / off air measuring valve, No. 8 electric on / off air measuring valve, No. 9 electric on / off air measuring valve;

[0013] No. 1 air duct main pipe, No. 2 air duct main pipe;

[0014] No. 1 main branch air duct, No. 1 secondary branch air duct, No. 2 secondary branch air duct, No. 3 secondary branch air duct;

[0015] No. 2 main branch air duct, No. 4 secondary branch air duct, No. 5 secondary branch air duct, No. 6 secondary branch air duct;

[0016] No. 3 main branch air duct, No. 7 secondary branch air duct, No. 8 secondary branch air duct, No. 9 secondary branch air duct;

[0017] The ventilation fan, No. 1 air volume sensor, No. 2 air volume sensor, No. 3 air volume sensor, No. 4 air volume sensor, static pressure sensor, No. 1 electric switch air volume valve, No. 2 electric switch air volume valve, No. 3 electric switch air volume valve, No. 4 electric switch air volume valve, No. 5 electric switch air volume valve, No. 6 electric switch air volume valve, No. 7 electric switch air volume valve, No. 8 electric switch air volume valve, No. 9 electric switch air volume valve are all electrically connected to the PLC control box;

[0018] The ends of the No. 1 secondary branch air duct, the No. 2 secondary branch air duct, and the No. 3 secondary branch air duct in the same direction are all connected to one end of the No. 1 main branch air duct, and the ends of the No. 1 secondary branch air duct, the No. 2 secondary branch air duct, and the No. 3 secondary branch air duct in the same direction are connected in pairs;

[0019] The ends of the No. 4 secondary branch air duct, the No. 5 secondary branch air duct, and the No. 6 secondary branch air duct in the same direction are all connected to one end of the No. 2 main branch air duct, and the ends of the No. 4 secondary branch air duct, the No. 5 secondary branch air duct, and the No. 6 secondary branch air duct in the same direction are connected in pairs;

[0020] The ends of the No. 7 secondary branch air duct, the No. 8 secondary branch air duct, and the No. 9 secondary branch air duct in the same direction are all connected to one end of the No. 3 main branch air duct, and the ends of the No. 7 secondary branch air duct, the No. 8 secondary branch air duct, and the No. 9 secondary branch air duct in the same direction are connected in pairs;

[0021] The other end of the No. 1 main branch air duct and the other end of the No. 2 main branch air duct are connected to one end of the No. 2 air duct trunk;

[0022] The other end of the No. 3 main branch air duct and the other end of the No. 2 air duct main pipe are connected to one end of the No. 1 air duct main pipe;

[0023] The other end of the No. 1 air duct main pipe is connected to the ventilation fan;

[0024] The No. 1 electric switch air volume valve and the No. 4 air volume sensor are arranged on the No. 1 secondary branch air duct in sequence;

[0025] The No. 2 electric switch air measuring valve is provided on the No. 2 secondary branch air duct;

[0026] The No. 3 electric switch air measuring valve is provided on the No. 3 secondary branch air duct;

[0027] The No. 7 electric switch air measuring valve is provided on the No. 4 secondary branch air duct;

[0028] The No. 8 electric switch air measuring valve is provided on the No. 5 secondary branch air duct;

[0029] The No. 9 electric switch air measuring valve is provided on the No. 6 secondary branch air duct;

[0030] The No. 6 electric switch air measuring valve is provided on the No. 7 secondary branch air duct;

[0031] The No. 5 electric switch air measuring valve is provided on the No. 8 secondary branch air duct;

[0032] The No. 4 electric switch air measuring valve is provided on the No. 9 secondary branch air duct;

[0033] The No. 1 air volume sensor is provided on the No. 1 main branch air duct;

[0034] The No. 2 main branch air duct is provided with the No. 2 air volume sensor;

[0035] The No. 3 air volume sensor is provided on the No. 3 main branch air duct;

[0036] The static pressure sensor is provided on the other end of the No. 1 air duct main pipe.

[0037] As a preferred technical solution of the present invention, the total pressure value required by the ventilation fan is n=4, that is, the P required by the ventilation fan 全压 =P1+P2+P3+P4, the P total pressure value is automatically calculated based on the real-time air volume data measured by the air volume sensor.

[0038] As a preferred technical solution of the present invention, the ventilation fan P 全压 =P 动压 +P 静压 , according to the air dynamic pressure formula in the duct:

[0039] The speed V is the wind speed of the duct closest to the ventilation fan.

[0040] As a preferred technical solution of the present invention, the static pressure sensor is installed on the ventilation main pipe close to the ventilation fan, and the static pressure sensor setting value is:

[0041]

[0042] Where V n V is the wind speed of the air duct closest to the ventilation fan, n =V4, n=4, static pressure sensor setting value P 静压 A variable that changes according to the air volume in the ventilation system.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The present invention can adaptively adjust the set static pressure value of the fan according to the wind pressure value actually required by the ventilation system in different air volume scenarios, reduce the additional output energy consumption of the fan caused by constant static pressure control, and improve the energy utilization rate of the ventilation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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:

[0046] Figure 1 It is a schematic diagram of the overall structure of the system of the present invention; DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, the present invention provides a variable static pressure variable air volume energy-saving ventilation system, including a ventilation fan 1, a PLC control box 2, a No. 1 air volume sensor 301, a No. 2 air volume sensor 302, a No. 3 air volume sensor 303, a No. 4 air volume sensor 304, a static pressure sensor 4, a No. 1 electric switch air volume valve 501, a No. 2 electric switch air volume valve 502, a No. 3 electric switch air volume valve 503, a No. 4 electric switch air volume valve 504, a No. 5 electric switch air volume valve 505, a No. 6 electric switch air volume valve 506, a No. 7 electric switch air volume valve 507, a No. 8 electric switch air volume valve 508, a No. 9 electric switch air volume valve 509, a No. 10 electric switch air volume valve 501, a No. 11 electric switch air volume valve 502, a No. 12 electric switch air volume valve 503, a No. 13 electric switch air volume valve 504, a No. 14 electric switch air volume valve 505, a No. 15 electric switch air volume valve 506, a No. 16 electric switch air volume valve 507, a No. 17 electric switch air volume valve 508, a No. 18 electric switch air volume valve 509, a No. 19 electric switch air volume valve 510, a No. 20 electric switch air volume valve 511, a No. 21 electric switch air volume valve 512, a No. 22 electric switch air volume valve 513, a No. 23 electric switch air volume valve 514, a No. 24 electric switch air volume valve Electric on-off air measuring valve 507, electric on-off air measuring valve No. 8 508, electric on-off air measuring valve No. 9 509, air duct main No. 1 6, air duct main No. 2 7, main branch air duct No. 1 8, secondary branch air duct No. 1 801, secondary branch air duct No. 2 802, secondary branch air duct No. 3 803, main branch air duct No. 2 9, secondary branch air duct No. 4 901, secondary branch air duct No. 5 902, secondary branch air duct No. 6 903, main branch air duct No. 3 10, secondary branch air duct No. 7 1001, secondary branch air duct No. 8 1002, secondary branch air duct No. 9 1003.

[0050] First, according to the distribution of the exhaust duct network, determine the circuit with the most unfavorable wind pressure. Taking this attached figure as an example, the circuit with the most unfavorable wind pressure is: No. 1 secondary branch air duct 801 ~ No. 1 main branch air duct 8 ~ No. 2 air duct main 7 ~ No. 1 air duct main 6 ~ ventilation fan 1.

[0051] According to the calculation formula of duct resistance: For the exhaust system, in the above formula, only the wind speed v is a variable, and the other parameters are fixed values ​​and are constants.

[0052] The wind speed of the No. 1 secondary branch duct 801 is V1 obtained by converting the real-time wind speed Q1 value of the No. 4 wind speed sensor 304 (Note: The same below), the duct resistance is P1 (Note: According to the duct resistance calculation formula, it can be obtained by substituting V1, the same below).

[0053] The wind speed of the No. 1 main branch air duct 8 is V2 obtained by numerical calculation and conversion of the real-time air volume Q2 of the No. 1 air volume sensor 301, and the air duct resistance is P2.

[0054] The air duct main pipe No. 2 7, the air duct wind speed is V3 calculated and converted by the sum of the real-time air volumes of the No. 1 air volume sensor 301 and the No. 2 air volume sensor 302 Q3, and the air duct resistance is P3.

[0055] Duct main 6 No. 1, duct wind speed is V4 calculated and converted from the sum of real-time air volumes of air volume sensor No. 1 301, air volume sensor No. 2 302 and air volume sensor No. 3 303 by Q4, and duct resistance is P4.

[0056] The required total pressure for ventilation fan 1 In this embodiment, n=4, that is, the P required by the ventilation fan 1 全压 =P1+P2+P3+P4, where P 全压 The value is automatically calculated based on the real-time air volume data measured by the air volume sensor.

[0057] For ventilation fan 1, P 全压 =P 动压 +P 静压 , according to the air dynamic pressure formula in the duct:

[0058] (wherein speed V is the wind speed of the air duct closest to the ventilation fan. In this embodiment, V=V3).

[0059] The static pressure sensor 4 is installed on the ventilation main pipe close to the ventilation fan 1. The static pressure sensor 4 is set to

[0060]

[0061] Where V nis the wind speed of the air duct closest to the ventilation fan. In this embodiment, V n =V4, n=4. Static pressure sensor 4 set value P 静压 A variable that changes according to the air volume in the ventilation system.

[0062] When one or more of the No. 1 to 9 electric switch air volume valves (501 to 509) are closed or opened, the PLC control box 2 will automatically calculate the P according to the air volume sensor. 静压 The static pressure setting of the ventilation fan 1 changes automatically to achieve the energy-saving design requirements of variable static pressure and variable air volume.

[0063] 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 variable static pressure and variable air volume energy-saving ventilation system, characterized in that: include: Ventilation fan (1); PLC control box (2); No. 1 air volume sensor (301), No. 2 air volume sensor (302), No. 3 air volume sensor (303), No. 4 air volume sensor (304); Static pressure sensor (4); No. 1 electric on / off air measuring valve (501), No. 2 electric on / off air measuring valve (502), No. 3 electric on / off air measuring valve (503), No. 4 electric on / off air measuring valve (504), No. 5 electric on / off air measuring valve (505), No. 6 electric on / off air measuring valve (506), No. 7 electric on / off air measuring valve (507), No. 8 electric on / off air measuring valve (508), and No. 9 electric on / off air measuring valve (509); No. 1 air duct main pipe (6), No. 2 air duct main pipe (7); No. 1 main branch air duct (8), No. 1 secondary branch air duct (801), No. 2 secondary branch air duct (802), No. 3 secondary branch air duct (803); No. 2 main branch air duct (9), No. 4 secondary branch air duct (901), No. 5 secondary branch air duct (902), No. 6 secondary branch air duct (903); No. 3 main branch air duct (10), No. 7 secondary branch air duct (1001), No. 8 secondary branch air duct (1002), No. 9 secondary branch air duct (1003); The ventilation fan (1), the No. 1 air volume sensor (301), the No. 2 air volume sensor (302), the No. 3 air volume sensor (303), the No. 4 air volume sensor (304), the static pressure sensor (4), the No. 1 electric switch air volume valve (501), the No. 2 electric switch air volume valve (502), the No. 3 electric switch air volume valve (503), the No. 4 electric switch air volume valve (504), the No. 5 electric switch air volume valve (505), the No. 6 electric switch air volume valve (506), the No. 7 electric switch air volume valve (507), the No. 8 electric switch air volume valve (508), and the No. 9 electric switch air volume valve (509) are all electrically connected to the PLC control box (2); The ends of the No. 1 secondary branch air duct (801), the No. 2 secondary branch air duct (802), and the No. 3 secondary branch air duct (803) in the same direction are all connected to one end of the No. 1 main branch air duct (8), and the ends of the No. 1 secondary branch air duct (801), the No. 2 secondary branch air duct (802), and the No. 3 secondary branch air duct (803) in the same direction are connected in pairs; The ends of the No. 4 secondary branch air duct (901), the No. 5 secondary branch air duct (902), and the No. 6 secondary branch air duct (903) in the same direction are all connected to one end of the No. 2 main branch air duct (9), and the ends of the No. 4 secondary branch air duct (901), the No. 5 secondary branch air duct (902), and the No. 6 secondary branch air duct (903) in the same direction are connected in pairs; The ends of the No. 7 secondary branch air duct (1001), the No. 8 secondary branch air duct (1002), and the No. 9 secondary branch air duct (1003) in the same direction are all connected to one end of the No. 3 main branch air duct (10), and the ends of the No. 7 secondary branch air duct (1001), the No. 8 secondary branch air duct (1002), and the No. 9 secondary branch air duct (1003) in the same direction are connected in pairs; The other end of the No. 1 main branch air duct (8) and the other end of the No. 2 main branch air duct (9) are both connected to one end of the No. 2 air duct main pipe (7); The other end of the No. 3 main branch air duct (10) and the other end of the No. 2 air duct main pipe (7) are connected to one end of the No. 1 air duct main pipe (6); The other end of the No. 1 air duct main pipe (6) is connected to the ventilation fan (1); The No. 1 secondary branch air duct (801) is provided with the No. 1 electric switch air volume valve (501) and the No. 4 air volume sensor (304) in sequence; The No. 2 secondary branch air duct (802) is provided with the No. 2 electric switch air measuring valve (502); The No. 3 secondary branch air duct (803) is provided with the No. 3 electric switch air measuring valve (503); The No. 7 electric on / off air measuring valve (507) is provided on the No. 4 secondary branch air duct (901); The No. 8 electric on / off air measuring valve (508) is provided on the No. 5 secondary branch air duct (902); The No. 9 electric on / off air measuring valve (509) is provided on the No. 6 secondary branch air duct (903); The No. 6 electric on / off air measuring valve (506) is provided on the No. 7 secondary branch air duct (1001); The No. 5 electric on / off air measuring valve (505) is provided on the No. 8 secondary branch air duct (1002); The No. 4 electric on / off air measuring valve (504) is provided on the No. 9 secondary branch air duct (1003); The No. 1 main branch air duct (8) is provided with the No. 1 air volume sensor (301); The No. 2 main branch air duct (9) is provided with the No. 2 air volume sensor (302); The No. 3 main branch air duct (10) is provided with the No. 3 air volume sensor (303); The static pressure sensor (4) is provided on the other end of the No. 1 air duct main pipe (6).

2. A variable static pressure and variable air volume energy-saving ventilation system according to claim 1, characterized in that: The total pressure value required by the ventilation fan (1) n = 4, i.e. the P required by the ventilation fan (1) 金压 =P1+P2+P3+P4, the P total pressure value is automatically calculated based on the real-time air volume data measured by the air volume sensor.

3. The variable static pressure and variable air volume energy-saving ventilation system according to claim 1, characterized in that: The ventilation fan (1) P 全压 =P 动压 +P 静压 , according to the air dynamic pressure formula in the duct: The speed V is the wind speed of the duct closest to the ventilation fan.

4. The variable static pressure and variable air volume energy-saving ventilation system according to claim 1, characterized in that: The static pressure sensor (4) is installed on a ventilation main pipe close to the ventilation fan (1), and the static pressure sensor (4) is set to: Where V n V is the wind speed of the air duct closest to the ventilation fan, n =V4, n=4, static pressure sensor (4) set value P 静压 A variable that changes according to the air volume in the ventilation system.

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