An indoor positive and negative pressure control system

Abstract

The present invention relates to an indoor positive and negative pressure control system, wherein at least one indoor air inlet fan and at least one indoor exhaust fan are arranged indoors, and a corresponding exhaust outlet is arranged in the indoor space where the indoor air inlet fan is located, wherein the indoor air inlet fan is used to introduce outdoor air into the indoor space, and the indoor exhaust fan is used to introduce indoor air to the outdoor space, and the indoor positive and negative pressure control system further comprises an indoor air quality detection module and a control module, wherein the indoor air quality detection module is arranged near the exhaust outlet, and the control module is used to control the opening and closing of the indoor air inlet fan and the indoor exhaust fan according to the data obtained by the indoor air quality detection module. The present invention realizes a specific flow direction of indoor air by controlling the air volume of indoor air inlet and air outlet, and reduces the mutual contamination of indoor pollutants.

Description

Technical Field

[0001] The invention relates to an indoor positive and negative pressure control system. Background Art

[0002] With the rapid development of the current economy and industry, air pollution in most parts of my country is becoming increasingly serious. In addition to the long-standing problems of indoor formaldehyde and volatile gas pollution, haze has become a hot topic of discussion. During haze weather, the air is filled with a large number of inhalable particles - PM10 and PM2.5 (PM10 and PM2.5 refer to fine particles in the atmosphere with a diameter less than or equal to 10 and 2.5 microns). Among them, PM2.5 can directly invade the human bronchioles and lung cells, directly affecting the ventilation function of the lungs and making the body prone to hypoxia. Therefore, how to purify the air quality of indoor spaces where people spend a long time has become a top priority in ensuring the health of the whole people.

[0003] In the prior art, a positive and negative pressure solution is adopted, and there is a positive and negative pressure difference in multiple spaces indoors, and air flows indoors. The existing fresh air system has no wind pressure control method, and the air purification effect is easily affected. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and provide an indoor positive and negative pressure control system, wherein at least one indoor air inlet fan and at least one indoor exhaust fan are arranged indoors, and corresponding exhaust vents are arranged in the indoor space where the indoor air inlet fan is located, the indoor air inlet fan is used to introduce outdoor air into the indoor space, and the indoor exhaust fan is used to introduce indoor air to the outdoor space.

[0005] The indoor positive and negative pressure control system also includes an indoor air quality detection module and a control module. The indoor air quality detection module is arranged near the exhaust outlet. The control module is used to control the opening and closing of the indoor air intake fan and the indoor exhaust fan according to the data obtained by the indoor air quality detection module.

[0006] The room is provided with a plurality of indoor spaces, and each of the indoor spaces is provided with an indoor exhaust fan and an indoor air inlet fan.

[0007] The indoor air intake fan in the indoor space with the worst air quality is in a closed state, and the indoor exhaust fan is in an open state.

[0008] The indoor air inlet fan is arranged at the top of the indoor space.

[0009] The outdoor air outlet is arranged at the bottom of the indoor space.

[0010] Among the multiple indoor exhaust fans in the room, only one indoor exhaust fan is turned on, and the other indoor exhaust fans are turned off.

[0011] The indoor positive and negative pressure control system further comprises an outdoor air quality detection module, and the outdoor air quality detection module is arranged near the air inlet of the indoor air inlet fan.

[0012] The control module comprises:

[0013] An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data;

[0014] Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ;

[0015] The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform linear fitting and obtain f(T)=a i T+b i ; T is time;

[0016] Judgment unit:

[0017] Calculate the deviation ΔX i ,

[0018] ΔX i =a i -(a1+a2+…+a n ) / n,

[0019] where a1+a2+…+a n 、a i The corresponding wind pressure coefficient C of the air outlet i All positive or all negative;

[0020] When ΔX i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

[0021] The control module comprises:

[0022] An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data;

[0023] Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ;

[0024] The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform linear fitting and obtain f(T)=a iT+b i ; T is time;

[0025] Judgment unit:

[0026] Calculate the deviation ΔX i ,

[0027] ΔX i =|C i |a i -(|C1|a1+|C2|a2+…+|C n |a n ) / n,

[0028] where a1+a2+…+a n 、The wind pressure coefficient C of the air outlet corresponding to ai i All positive or all negative;

[0029] When ΔX i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

[0030] The control module comprises:

[0031] An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data;

[0032] Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ;

[0033] The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform quadratic polynomial fitting and obtain f(T)=a i T 2 +b i T+c i ; T is time;

[0034] Judgment unit:

[0035] when a i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

[0036] The present invention realizes a specific flow direction of indoor air by controlling the air volume of indoor air inlet and outlet, thereby reducing mutual contamination of indoor pollutants.

[0037] The above and other features, aspects and advantages of the present application will be more readily understood with reference to the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 Schematic diagram of wind pressure on high-rise buildings.

[0040] Figure 2 This is a typical layout diagram of indoor fans and detection modules.

[0041] Figure 3 This is a schematic diagram of various modules in an indoor positive and negative pressure control system.

[0042] Indoor air inlet fan 1, indoor exhaust fan 2, indoor air quality detection module 3, outdoor air quality detection module 4, control module. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

[0044] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0045] like Figure 1 As shown in the figure, the wind pressure coefficient of a high-rise building at different monitoring points is very complex. When facing the wind, the wind pressure coefficient will be different when facing wind at different angles. The wind pressure coefficient is a dimensionless parameter, which is certain under given wind direction, building, and building environment. The present invention uses the three-dimensional CFD software airpark that simulates building ventilation to calculate the pressure on the building surface. The calculation formula of the wind pressure coefficient is as follows:

[0046]

[0047] Where P is the building surface pressure generated by wind, V refIt is the wind speed at the same height as the roof of the building but without turbulence. By modeling, the wind pressure coefficients at different monitoring points under different wind directions can be simulated.

[0048] The specific implementation of the present invention is as follows: an indoor positive and negative pressure control system, wherein at least one indoor air inlet fan and at least one indoor exhaust fan are arranged indoors, and corresponding exhaust vents are arranged in the indoor space where the indoor air inlet fan is located, wherein the indoor air inlet fan is used to introduce outdoor air into the indoor space, and the indoor exhaust fan is used to introduce indoor air to the outdoor space,

[0049] The indoor positive and negative pressure control system also includes an indoor air quality detection module and a control module. The indoor air quality detection module is arranged near the exhaust outlet. The control module is used to control the opening and closing of the indoor air intake fan and the indoor exhaust fan according to the data obtained by the indoor air quality detection module.

[0050] The room is provided with a plurality of indoor spaces, and each of the indoor spaces is provided with an indoor exhaust fan and an indoor air inlet fan.

[0051] The indoor air intake fan in the indoor space with the worst air quality is in a closed state, and the indoor exhaust fan is in an open state.

[0052] The indoor air inlet fan is arranged at the top of the indoor space.

[0053] The outdoor air outlet is arranged at the bottom of the indoor space.

[0054] Among the multiple indoor exhaust fans in the room, only one indoor exhaust fan is turned on, and the other indoor exhaust fans are turned off.

[0055] The indoor positive and negative pressure control system further comprises an outdoor air quality detection module, and the outdoor air quality detection module is arranged near the air inlet of the indoor air inlet fan.

[0056] The control module comprises:

[0057] An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data;

[0058] Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ;

[0059] The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform linear fitting and obtain f(T)=a i T+b i ; T is time;

[0060] Judgment unit:

[0061] Calculate the deviation ΔX i ,

[0062] ΔX i =a i -(a1+a2+…+a n ) / n,

[0063] where a1+a2+…+a n 、a i The corresponding wind pressure coefficient C of the air outlet i All positive or all negative;

[0064] When ΔX i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

[0065] The control module comprises:

[0066] An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data;

[0067] Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ;

[0068] The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform linear fitting and obtain f(T)=a i T+b i ; T is time;

[0069] Judgment unit:

[0070] Calculate the deviation ΔX i ,

[0071] ΔX i =|C i |a i -(|C1|a1+|C2|a2+…+|C n |a n ) / n,

[0072] where a1+a2+…+a n 、The wind pressure coefficient C of the air outlet corresponding to ai i All positive or all negative;

[0073] When ΔX iWhen it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

[0074] The control module comprises:

[0075] An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data;

[0076] Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ;

[0077] The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform quadratic polynomial fitting and obtain f(T)=a i T 2 +b i T+c i ; T is time;

[0078] Judgment unit:

[0079] when a i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

[0080] The present invention realizes a specific flow direction of indoor air by controlling the air volume of indoor air inlet and outlet, thereby reducing mutual contamination of indoor pollutants.

[0081] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0082] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An indoor positive and negative pressure control system, characterized in that: At least one indoor air inlet fan and at least one indoor air exhaust fan are arranged indoors, and corresponding air outlets are arranged in the indoor space where the indoor air inlet fan is located. The indoor air inlet fan is used to introduce outdoor air into the indoor space, and the indoor air exhaust fan is used to introduce indoor air to the outdoor space. The indoor positive and negative pressure control system further includes an indoor air quality detection module and a control module. The indoor air quality detection module is arranged near the exhaust port. The control module is used to control the opening and closing of the indoor air inlet fan and the indoor exhaust fan according to the data obtained by the indoor air quality detection module. The room is provided with a plurality of indoor spaces, and each of the indoor spaces is provided with an indoor exhaust fan and an indoor air inlet fan. The control module comprises: The indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform a linear fit and get f(T)=a i T+b i ; T is time; Judgment unit: Calculate the deviation ΔX i , ΔX i =a i -(a1+a2+…+a n ) / n, When ΔX i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

2. An indoor positive and negative pressure control system according to claim 1, characterized in that: The indoor air intake fan in the indoor space with the worst air quality is in a closed state, and the indoor exhaust fan is in an open state.

3. An indoor positive and negative pressure control system according to claim 1, characterized in that: The indoor air inlet fan is arranged at the top of the indoor space.

4. An indoor positive and negative pressure control system according to claim 1, characterized in that: Only one of the multiple indoor exhaust fans in the room is turned on, and the other indoor exhaust fans are turned off.

5. An indoor positive and negative pressure control system according to claim 1, characterized in that: The indoor positive and negative pressure control system further comprises an outdoor air quality detection module, and the outdoor air quality detection module is arranged near the air inlet of the indoor air inlet fan.

6. An indoor positive and negative pressure control system according to claim 1, characterized in that: The control module also includes: An outdoor wind direction data acquisition unit, used to acquire and display outdoor wind direction data; Wind pressure coefficient C i The acquisition unit is used to obtain the wind pressure coefficient C of all air outlets in the current wind direction. i ; Second judgment unit: Calculate the deviation ΔX i , ΔX i =|C i |a i -(|C1|a1+|C2|a2+…+|C n |a n ) / n, where a1+a2+…+a n 、The wind pressure coefficient C of the air outlet corresponding to ai i All positive or all negative; When ΔX i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

7. An indoor positive and negative pressure control system according to claim 1, characterized in that: The control module also includes: The second indoor air quality change calculation unit calculates the indoor air quality data A of the air outlet for a preset period of time. i,t , for A i，t Perform a quadratic polynomial fit and obtain f(T)=a i T 2 +b i T+c i ; T is time; The third judgment unit: when a i When it is greater than a preset value, the indoor exhaust fan of the indoor space corresponding to the current air outlet is turned on, and the preset value is a positive number.

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