Operation condition detection method for garage air and smoke exhaust system

Abstract

The invention provides an operation condition detection method for an air and smoke exhaust system of a garage, relates to the technical field of air and smoke exhaust system detection, and aims to flexibly and reliably detect each air and smoke exhaust device in the garage. An air flow speed sensor is arranged at an air exhaust pipeline of the air exhaust and smoke exhaust device; when the smoke condition exceeding the threshold value occurs in the kth sub-region, the reference response time of each sub-region is obtained; obtaining correction response time; respectively detecting the numerical value detection condition of the smoke sensor in each sub-region; and the response condition of the air and smoke exhaust device of each sub-area is detected. According to the invention, the method has the advantage that targeted and reliable operation condition detection can be carried out on the distribution of a plurality of air and smoke exhaust devices of the garage.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust and smoke exhaust system detection, and in particular to an operating condition detection method for an exhaust and smoke exhaust system in a garage. Background Art

[0002] With the rapid advancement of urbanization, garages are widely used in buildings such as residential areas, shopping malls and office buildings.

[0003] Underground garages are usually large and closed. Exhaust gases (such as carbon monoxide, carbon dioxide, nitrogen oxides, etc.) emitted by vehicles and potential smoke accumulation will pose a threat to personnel health and environmental safety. In order to ensure the air quality and fire safety in the garage, the exhaust and smoke exhaust system has become an indispensable facility. In addition to letting the exhaust and smoke exhaust system exhaust air and exhaust smoke normally on a daily basis, it is also necessary to monitor the garage environment to prevent sudden large-scale smoke caused by, for example, car failures and human factors, from causing greater safety risks. When the smoke surges to a certain amount, the exhaust and smoke exhaust system needs to respond in time to enhance its work intensity. In order to ensure the safety of the garage, it is necessary to test the operating conditions of the exhaust and smoke exhaust system, such as response reliability, so as to detect problems in time. However, due to the area of ​​the garage, the number and distribution diversity of the exhaust and smoke exhaust devices and the influence of the scope of interaction are relatively complex. Therefore, when testing the operating conditions of the exhaust and smoke exhaust system, it is difficult to set targeted testing standards for each exhaust and smoke exhaust device.

[0004] Therefore, it is necessary to design an operating condition detection method for the garage exhaust and smoke exhaust system, so as to achieve flexible and reliable detection of each exhaust and smoke exhaust device in the garage. Summary of the invention

[0005] The object of the present invention is to provide a method for detecting the operating condition of an exhaust and smoke exhaust system in a garage, which can flexibly and reliably detect each exhaust and smoke exhaust device in the garage.

[0006] The present invention is achieved through the following technical solutions:

[0007] A method for detecting the operating condition of a garage ventilation and smoke exhaust system comprises the following steps:

[0008] Smoke sensors and exhaust devices are respectively arranged in multiple sub-areas in the garage, and air flow velocity sensors are arranged at the exhaust ducts of the exhaust devices;

[0009] All the sub-regions are numbered from 1 to N in sequence, and the sub-region where the smoke condition exceeding the threshold occurs is numbered as k. When the smoke condition exceeding the threshold occurs in the k-th sub-region, the reference response time of each sub-region is obtained respectively;

[0010] Obtaining a modified response time according to the reference response time and the change in smoke density in the sub-area where the smoke condition exceeding the threshold occurs;

[0011] Detecting the value detection status of the smoke sensor in each sub-area respectively according to the corrected response time;

[0012] The response status of the exhaust and smoke exhaust device of each sub-area is detected respectively according to the corrected response time.

[0013] Preferably, the method for respectively obtaining the benchmark response time of each sub-area is:

[0014] The distance L between other sub-areas and the sub-area where the smoke condition exceeding the threshold occurs is obtained respectively. ki ,i≠k,i∈[1,n];

[0015] The reference response time of each sub-region is obtained according to the distances from other sub-regions to the sub-region where the smoke condition exceeding the threshold occurs.

[0016] Preferably, the method of respectively obtaining the reference response time of each sub-area according to the distance from other sub-areas to the sub-area where the smoke condition exceeding the threshold occurs is:

[0017] The relationship function between the smoke concentration and time of each sub-area is established respectively:

[0018]

[0019] Among them, sd ki (t) represents the smoke concentration in the i-th sub-area at time t from the time when smoke occurs in the k-th sub-area, α is the empirical coefficient of the garage, D is the diffusion coefficient of smoke, and exp represents the natural exponential function;

[0020] sd ki (t) is set as the preset first trigger concentration threshold, and the relationship function between smoke concentration and time is solved to obtain the benchmark response time t of the i-th sub-area ki .

[0021] Preferably, the method for obtaining the corrected response time according to the reference response time and the change in smoke density in the sub-area where the smoke condition exceeding the threshold occurs is:

[0022]

[0023] Among them, t ki is the benchmark response time of the ith sub-region, t ′ ki is the corrected response time of the ith sub-region, v SDkis the average change rate of the smoke concentration in the kth sub-area over time.

[0024] Preferably, the empirical coefficient α is obtained by fitting experimental data in a corresponding car garage.

[0025] Preferably, the method for detecting the numerical detection status of the smoke sensor in each sub-area respectively according to the corrected response time is:

[0026] At the time when smoke occurs in the kth sub-area, ′ ki After a certain time, check the smoke sensor value of the i-th sub-area, if the smoke sensor value is not less than the second trigger concentration threshold, the smoke sensor of the i-th sub-area passes the detection, otherwise the smoke sensor of the i-th sub-area fails the detection, and the second trigger concentration threshold is less than the first trigger concentration threshold;

[0027] Among them, t ′ ki is the corrected response time of the i-th sub-area, and when the smoke sensor reaches the first trigger concentration threshold, the exhaust and smoke exhaust device starts to respond and perform smoke exhaust work.

[0028] Preferably, the method for detecting the response of the exhaust and smoke exhaust device of each sub-area according to the modified response time is:

[0029] At the time when smoke occurs in the kth sub-area, ＜ ki After +δ time, check whether the air flow velocity sensor of the i-th sub-area reaches the corresponding threshold value, if so, the exhaust and smoke exhaust device of the i-th sub-area passes the test, otherwise, the exhaust and smoke exhaust device of the i-th sub-area fails the test;

[0030] Wherein, δ is a preset response time error parameter.

[0031] Preferably, the response time error parameter is no greater than 0.1 second.

[0032] Preferably, a plurality of indicator lights are provided, each of which is used to indicate the detection result of the smoke sensor and the exhaust and smoke exhaust device of each sub-area.

[0033] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0034] The present invention performs independent detection by respectively setting smoke sensors and exhaust and smoke exhaust devices in multiple sub-areas, so as to facilitate accurate detection of each part of the operating condition of the entire exhaust and smoke exhaust system;

[0035] The present invention calculates the reference response time of other sub-areas after a smoke condition exceeding a threshold value appears in one sub-area according to the smoke characteristics and the interval distribution characteristics of each word area, and can effectively use the map characteristics and smoke characteristics to provide an excellent reference response time as a basis;

[0036] The present invention dynamically calculates the corrected response time in combination with the reference response time and the change in smoke concentration, so that the system can adjust the reference standard according to the actual situation, not only to adapt to the differences and regional distribution of different smoke types, but also to make adjustments according to the real-time situation of smoke diffusion from the actual source, thereby improving the accuracy and reliability of the response time used as a reference;

[0037] The present invention performs working condition detection on the sensor used for detection and the device used for exhausting smoke and air respectively, providing a more comprehensive detection;

[0038] The present invention can formulate highly targeted working condition detection indicators for the detection and response devices of the exhaust and smoke exhaust systems of each sub-area, and has stronger reliability and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic flow chart of an operating condition detection method for a garage exhaust and smoke exhaust system provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0040] 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Example 1

[0042] This embodiment provides a method for detecting the operating condition of a garage exhaust system. Figure 1 , including the following steps:

[0043] Smoke sensors and exhaust devices are respectively arranged in multiple sub-areas in the garage, and air flow velocity sensors are arranged at the exhaust ducts of the exhaust devices;

[0044] All the sub-regions are numbered from 1 to N in sequence, and the sub-region where the smoke condition exceeding the threshold occurs is numbered as k. When the smoke condition exceeding the threshold occurs in the k-th sub-region, the reference response time of each sub-region is obtained respectively;

[0045] Obtaining a modified response time according to the reference response time and the change in smoke density in the sub-area where the smoke condition exceeding the threshold occurs;

[0046] Detecting the value detection status of the smoke sensor in each sub-area respectively according to the corrected response time;

[0047] The response status of the exhaust and smoke exhaust device of each sub-area is detected respectively according to the corrected response time.

[0048] This embodiment can independently detect the smoke condition of each sub-area and the operating status of the exhaust and smoke exhaust equipment, and realize the refined management of the operating conditions of the entire exhaust and smoke exhaust system. The air flow velocity sensor can detect the working intensity of each exhaust and smoke exhaust device. Normally, the exhaust and smoke exhaust device is in the normal exhaust and smoke exhaust mode. When the smoke sensor detects that the smoke has reached a certain high concentration, the system should adjust the exhaust and smoke exhaust device in time to increase the efficiency and strength of the exhaust and smoke exhaust. This embodiment detects whether the smoke sensor and the exhaust and smoke exhaust device can respond quickly within the effective time after the smoke reaches a certain high concentration. This embodiment can generate an accurate reference response time, that is, a benchmark response time, by utilizing map features (such as the mutual distance of sub-areas) and the characteristics of smoke diffusion, as the basis for subsequent monitoring and response. On this basis, the basic benchmark response time is corrected in a more targeted manner in combination with the actual changes in smoke concentration at the source of occurrence, thereby improving the accuracy and reliability of the reference response time of the facilities in each sub-area. Furthermore, targeted operating condition detection indicators can be formulated for the smoke sensors and exhaust and smoke exhaust devices in each sub-area, thereby improving the accuracy and reliability of the operating condition detection of the exhaust and smoke exhaust system of the entire garage.

[0049] In this embodiment, the method for respectively obtaining the reference response time of each sub-area is:

[0050] The distance L between other sub-areas and the sub-area where the smoke condition exceeding the threshold occurs is obtained respectively. ki ,i≠k,i∈[1,N];

[0051] The reference response time of each sub-region is obtained according to the distances from other sub-regions to the sub-region where the smoke condition exceeding the threshold occurs.

[0052] As a preferred solution, the method of obtaining the reference response time of each sub-area according to the distance from other sub-areas to the sub-area where the smoke condition exceeding the threshold occurs is:

[0053] The relationship function between the smoke concentration and time of each sub-area is established respectively:

[0054]

[0055] Among them, sd ki (t) represents the smoke concentration in the i-th sub-area at time t from the time when smoke occurs in the k-th sub-area, α is the empirical coefficient of the garage, D is the diffusion coefficient of smoke, and exp represents the natural exponential function;

[0056] sd ki (t) is set as the preset first trigger concentration threshold, and the relationship function between smoke concentration and time is solved to obtain the benchmark response time t of the i-th sub-area ki .

[0057] On this basis, the method for obtaining the corrected response time according to the reference response time and the change in smoke density in the sub-area where the smoke condition exceeding the threshold occurs is:

[0058]

[0059] Among them, t ki is the benchmark response time of the ith sub-region, t ′ ki is the corrected response time of the ith sub-region, is the average change rate of the smoke concentration in the kth sub-area over time.

[0060] The correction response time is obtained by referring to the actual change of the smoke concentration at the source. Assuming that the diffusion rate of the source remains unchanged, the time when the smoke starts to occur at the source is t ki The concentration at Its changing speed at this time is By seeking Compared to Ratio A variation deviation reference standard can be obtained when equal When the ratio is 1, no correction is required. ki When the ratio is less than 1, it means that the source of the radiation has slowed down, so the diffusion rate and concentration will be reduced to a certain extent, and the reference time also needs to be increased, so it is corrected to t ki Multiply by the inverse of the ratio On the contrary, when the ratio is greater than 1, it means that the source of the emission has become faster, so the diffusion rate and concentration will increase to a certain extent, and it is also corrected to t ki Multiply by the inverse of the ratio

[0061] Furthermore, the empirical coefficient α is obtained by fitting experimental data in a corresponding car garage.

[0062] Next, the method for detecting the numerical detection status of the smoke sensor in each sub-area according to the corrected response time is as follows:

[0063] At the time when smoke occurs in the kth sub-area, ′ ki After a certain time, check the smoke sensor value of the i-th sub-area, if the smoke sensor value is not less than the second trigger concentration threshold, the smoke sensor of the i-th sub-area passes the detection, otherwise the smoke sensor of the i-th sub-area fails the detection, and the second trigger concentration threshold is less than the first trigger concentration threshold;

[0064] Among them, t ′ ki is the corrected response time of the i-th sub-area, and when the smoke sensor reaches the first trigger concentration threshold, the exhaust and smoke exhaust device starts to respond and perform smoke exhaust work.

[0065] On the other hand, the method for detecting the response of the exhaust and smoke exhaust device of each sub-area according to the modified response time is:

[0066] At the time when smoke occurs in the kth sub-area, 3 ki After +δ time, check whether the air flow velocity sensor of the i-th sub-area reaches the corresponding threshold value, if so, the exhaust and smoke exhaust device of the i-th sub-area passes the test, otherwise, the exhaust and smoke exhaust device of the i-th sub-area fails the test;

[0067] Wherein, δ is a preset response time error parameter. The response time error parameter provides an allowable reaction time for each exhaust and smoke exhaust device.

[0068] As a further preferred solution, the response time error parameter is no greater than 0.1 second.

[0069] Finally, it is also possible to preferably provide a plurality of indicator lights, each of which is used to indicate the detection results of the smoke sensor and the exhaust and smoke exhaust device of each sub-area.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 method for detecting the operating condition of a garage exhaust and smoke exhaust system, characterized in that: The following steps are involved: Smoke sensors and exhaust devices are respectively arranged in multiple sub-areas in the garage, and air flow velocity sensors are arranged at the exhaust ducts of the exhaust devices; All the sub-regions are numbered from 1 to N in sequence, and the sub-region where the smoke condition exceeding the threshold occurs is numbered as k. When the smoke condition exceeding the threshold occurs in the k-th sub-region, the reference response time of each sub-region is obtained respectively; Obtaining a modified response time according to the reference response time and the change in smoke density in the sub-area where the smoke condition exceeding the threshold occurs; Detecting the value detection status of the smoke sensor in each sub-area respectively according to the corrected response time; The response status of the exhaust and smoke exhaust device of each sub-area is detected respectively according to the corrected response time.

2. The operating condition detection method for a garage exhaust system according to claim 1, characterized in that: The method for respectively obtaining the benchmark response time of each sub-area is: The distance L between other sub-areas and the sub-area where the smoke condition exceeding the threshold occurs is obtained respectively. ki ,i≠k,i∈[1,N]; The reference response time of each sub-region is obtained according to the distances from other sub-regions to the sub-region where the smoke condition exceeding the threshold occurs.

3. The operating condition detection method for a garage exhaust system according to claim 2, characterized in that: The method of obtaining the reference response time of each sub-area according to the distance from other sub-areas to the sub-area where the smoke condition exceeding the threshold occurs is: The relationship function between the smoke concentration and time of each sub-area is established respectively: Among them, sd ki (t) represents the smoke concentration in the i-th sub-area at time t from the time when smoke occurs in the k-th sub-area, α is the empirical coefficient of the garage, D is the diffusion coefficient of smoke, and exp represents the natural exponential function; sd ki (t) is set as the preset first trigger concentration threshold, and the relationship function between smoke concentration and time is solved to obtain the benchmark response time t of the i-th sub-area ki .

4. The method for detecting the operating condition of the ventilation and smoke exhaust system of a garage according to claim 3, characterized in that: The method for obtaining the corrected response time according to the reference response time and the change in smoke density in the sub-area where the smoke condition exceeding the threshold occurs is: Among them, t ki is the benchmark response time of the ith sub-region, t ′ ki is the corrected response time of the ith sub-region, is the average change rate of the smoke concentration in the kth sub-area over time.

5. The method for detecting the operating condition of the ventilation and smoke exhaust system of a garage according to claim 4, characterized in that: The empirical coefficient α is obtained by fitting experimental data in the corresponding car garage.

6. The method for detecting the operating condition of the ventilation and smoke exhaust system of a garage according to claim 1, characterized in that: The method for detecting the numerical detection status of the smoke sensor in each sub-area according to the modified response time is as follows: At the time when smoke occurs in the kth sub-area, ′ ki After a certain time, check the smoke sensor value of the i-th sub-area, if the smoke sensor value is not less than the second trigger concentration threshold, the smoke sensor of the i-th sub-area passes the detection, otherwise the smoke sensor of the i-th sub-area fails the detection, and the second trigger concentration threshold is less than the first trigger concentration threshold; Among them, t ′ ki is the corrected response time of the i-th sub-area, and when the smoke sensor reaches the first trigger concentration threshold, the exhaust and smoke exhaust device starts to respond and perform smoke exhaust work.

7. The method for detecting the operating condition of the ventilation and smoke exhaust system of a garage according to claim 1, characterized in that: The method for detecting the response of the exhaust and smoke exhaust device of each sub-area according to the modified response time is as follows: At the time when smoke occurs in the kth sub-area, ′ ki After +δ time, check whether the air flow velocity sensor of the i-th sub-area reaches the corresponding threshold value, if so, the exhaust and smoke exhaust device of the i-th sub-area passes the test, otherwise, the exhaust and smoke exhaust device of the i-th sub-area fails the test; Wherein, δ is a preset response time error parameter.

8. The method for detecting the operating condition of the ventilation and smoke exhaust system of a garage according to claim 7, characterized in that: The response time error parameter is no greater than 0.1 second.

9. The method for detecting the operating condition of a garage exhaust system according to claim 1, characterized in that: A plurality of indicator lights are provided, each of which is used to indicate the detection result of the smoke sensor and the exhaust and smoke exhaust device in each sub-area.

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