CN103852398B - A kind of dust filter screen differential static pressure abatement detecting method based on temperature adjustmemt - Google Patents

Abstract

The invention relates to a temperature-corrected method for detecting the static pressure difference of the failure of a dust collection filter. Build the dust collection filter failure detection experimental system: arrange the upper computer and fault alarm of the static pressure difference acquisition module of the dust collection filter in the purifier system; establish a data collection and recording system; the air purifier runs continuously in the experimental environment, At the same time, the host computer monitors the static pressure difference P(k) and the ambient temperature T(k) of the dust collection filter of the air purifier system in real time, k represents the current running time, and records the total running time of the air purifier. The temperature-based correction method can estimate the change of the static pressure difference at the same basic temperature reference value online, and realize the online diagnosis of the dust collection filter screen fault of the air purifier system. Finally, this method is applied to the failure detection of the dust collection filter of the subsequent related air purifier system. The correction method is completed through programming, which reduces the product hardware cost and improves the flexibility, reliability and accuracy of the system.

Description

A method for detecting the static pressure difference failure of dust collection filter based on temperature correction

technical field

The invention relates to a fault diagnosis technology, in particular to a temperature correction-based method for detecting the static pressure difference of the failure of a dust collection filter.

Background technique

In recent decades, with the development of industry and the provision of personal living standards, people have paid more and more attention to air quality. However, the statistical results in 2012 show that only 40.9% of the 325 prefecture-level and above cities meet the environmental air quality standards; only 23.9% of the 113 key environmental protection cities meet the environmental air quality standards. For improving air quality, people have proposed many effective methods and measures. Among them, air purifiers are the most commonly used and most effective tools for improving indoor air quality that is most closely related to people's lives.

Air purification series products can absorb, decompose or transform various air pollutants to a certain extent, thereby improving air cleanliness. But the key equipment among them - the filter screen (including dust collection, deodorization, formaldehyde removal and dehumidification), as the use time increases, its efficacy will gradually decay or even completely lose. If the changes in the efficacy of these filters cannot be grasped in real time, the invalid filters will inevitably cause health damage to users.

In the prior art, the feasible methods for filter screen failure mainly include dust photoelectric detection method, filter screen resistance detection method and differential pressure detection method.

The dust photoelectric detection method uses the detection of the amount of dust per unit volume after the air passes through the air purifier to determine whether the filter screen is invalid. When the cleanliness of the original air is good, before and after the air purifier purifies the air, the unit value of the amount of dust per unit volume of the air will not change significantly, so it will lead to false alarms, and its limitations are obvious.

The resistance detection method determines whether the filter screen is invalid by detecting the resistance change between fixed distances in the filter screen, and the change of the filter screen resistance can be affected by many factors other than dust, and the accuracy of this method is not high.

The differential pressure method is to detect the failure of the filter screen by detecting the front and rear wind pressure difference passing through the filter screen, which is easily disturbed by the change of air temperature. Therefore, the above-mentioned methods have great limitations on the sensitivity and robustness of filter failure detection.

Contents of the invention

The present invention aims at the problem that the above method has great limitations on the fault diagnosis of filter screen failure in the prior art, and proposes a method for detecting the static pressure difference of dust collection filter screen failure based on temperature correction.

Based on the method of detecting the static pressure difference on both sides of the air inlet and outlet of the dust collection filter to determine its effectiveness, this method takes into account the uncertainty disturbance of the static pressure difference caused by the change of the dry air density caused by the fluctuation of the ambient temperature. , the factors that affect the accuracy of detecting the failure of the dust collection filter, are corrected using the correction method based on temperature parameters. The static pressure difference change at the same basic temperature reference value can be estimated online, and the online diagnosis of the dust collection filter screen fault of the air purifier system is realized.

The present invention provides a static pressure difference detection method for dust collection filter failure based on temperature correction. The static pressure difference acquisition module of the network, the host computer and the fault alarm; the second step: establish a data acquisition and recording system; the third step: make the air purifier run continuously in the experimental environment, and the host computer monitors the air purifier system in real time The static pressure difference P(k) and the ambient temperature T(k) of the dust collection filter, k represents the current running time, and use the host computer data acquisition and recording system to record the total running time of the air purifier; the fourth step: adopt The correction method based on the ambient temperature T(k) corrects the static pressure difference P(k) in real time, and obtains the corrected static pressure difference P'(k) under the same reference temperature value; the fifth step: in the dust collection filter Determine the static pressure difference threshold β of the fault alarm when it fails; the sixth step: perform the failure detection of the dust collection filter of the air purifier according to the static pressure difference threshold β.

Preferably, in the fourth step, the real-time correction of the static pressure difference P(k) using a correction method based on the ambient temperature T(k) includes: calculating the corrected static pressure difference P'(k) at time k as In the formula, n≥1T(k) represents the ambient temperature.

Preferably, in the sixth step, performing the failure detection of the dust collection filter of the air purifier according to the static pressure difference threshold β includes: the host computer judges the residual e(k)=||P'(k)-P at the current moment ′(0)|| and the static pressure difference threshold β, when the residual e(k) is greater than the static pressure difference threshold β, the fault alarm will send out an alarm.

Applying the above-mentioned method of the present invention to the failure detection of the dust collection filter of the relevant air purifier system, wherein the correction method can be completed by programming, which can further reduce the product hardware cost and improve the flexibility, reliability and accuracy of the system sex. The beneficial effect of the present invention is that: the temperature-corrected static pressure difference detection method for the failure of the dust collection filter of the present invention has the ability to diagnose the failure of the dust collection filter, and at the same time has strong sensitivity and robustness, and overcomes the existing technology for Defects such as false alarms and poor detection accuracy during dust filter detection. It can be widely used in the detection of dust collection filters of various air purification equipment.

Description of drawings

Fig. 1 is the main detection hardware structure design block diagram that the present invention realizes;

Fig. 2 is a flow chart of a temperature-corrected static pressure difference failure detection method for a dust collection filter according to an embodiment of the present invention;

Fig. 3 is the change trend diagram of the static pressure difference on both sides of the inlet and outlet of the dust collection filter screen of the air purifier of the present invention;

Fig. 4 is a trend diagram of the static pressure difference between the inlet and outlet of the dust collection filter of the air purifier after temperature correction according to the present invention.

It should be noted that the accompanying drawings are used to illustrate the present invention, but not to limit the present invention.

detailed description

In order to make the content of the present invention clearer and easier to understand, the present invention will be further described below through specific embodiments of the present invention.

The realization method first establishes the static pressure difference detection hardware system as shown in the hardware structure block diagram in Fig. Conduit 3 leads to a measurable static pressure difference. The standard electric signal of the static pressure difference is obtained through the high-precision differential pressure sensor 4 with a suitable range, and the relevant software is compiled to realize the computer acquisition, filtering and recording of the original data of the static pressure difference. /D conversion acquisition equipment collects, records and analyzes relevant data, and judges whether the air purifier is invalid in real time.

Fig. 2 is a flowchart of a method for detecting failure of a static pressure difference of a dust collection filter based on temperature correction according to an embodiment of the present invention. As shown in Figure 2, the method for detecting the failure of the static pressure difference of the dust collection filter based on temperature correction according to the embodiment of the present invention may include the following steps:

The first step S1: Build the dust collection filter failure detection experimental system, which includes: the static pressure difference acquisition module of the dust collection filter, the host computer and the fault alarm;

Second step S2: setting the static pressure difference acquisition module in the air purifier to collect static pressure difference data, thereby establishing a data acquisition and recording system;

The third step S3: the air cleaner runs continuously in the experimental environment (at the same time, the static pressure difference acquisition module as the data acquisition and recording system collects the static pressure difference data), and the upper computer monitors the dust collection of the air cleaner system in real time The static pressure difference P(k) of the filter screen and the ambient temperature T(k), k the current running time, and use the data acquisition and recording system to record the total running time of the air purifier;

The fourth step S4: Use the correction method based on the ambient temperature T(k) to correct the static pressure difference P(k) in real time, and calculate the corrected static pressure difference P'(k) at the same reference temperature value:

${\mathrm{<span\; class="notranslate">\; P</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; \&lsqb;</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1.1774</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1.4128</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 250</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 50</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1.4128</span>}<span\; class="notranslate">\; \&rsqb;</span>}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>$

The fifth step S5: determine the static pressure difference threshold β for fault alarm when the dust collection filter fails;

The sixth step S6: according to the static pressure difference threshold β, perform the failure detection of the dust collection filter of the air purifier. Specifically, for example, the upper computer judges the residual error e(k)=||P'(k)-P'(0)|| and the size of the static pressure difference threshold β , when the residual e(k) is greater than the static pressure difference threshold β, the fault alarm will issue a fault (failure) alarm.

Fig. 3 shows the variation trend diagram of the static pressure difference on both sides of the inlet and outlet of the dust collection filter screen of the air purifier in the embodiment of the present invention. In the example of the trend graph shown, the horizontal axis is time and the unit is day, and the vertical axis is static pressure difference and the unit is Pa. It can be seen from Fig. 3 that when the air purifier is actually started, in the first 32 days, the static pressure difference obtained by the detection system designed by the present invention is gradually increasing, which is in line with actual expectations. However, in subsequent experiments, the change was not obvious, and there was a deviation from the actual situation.

Obviously, such a deviation is caused by the influence of the laboratory and ambient temperature in the later period. As shown in Fig. 4, after the static pressure difference is corrected for temperature in the present invention, the change trend is in line with expectations, and the static pressure difference threshold value for determining the fault alarm when the dust collection filter of the present invention fails can be obtained. Obtaining the threshold value can realize the failure detection of the dust collection filter of the air purifier.

It should be noted that, unless otherwise specified, the terms "first", "second", "third" and other descriptions in the specification are only used to distinguish each component, element, step, etc. in the specification, rather than to express The logical relationship or sequence relationship between various components, elements, and steps, etc.

It can be understood that although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or be modified to be equivalent to equivalent changes. Example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, which do not deviate from the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims (3)

1. a dust filter screen inefficacy differential static pressure detection method based on temperature adjustmemt, it is characterised in that comprise the steps:

First step: build dust filter screen failure detection experimental system, wherein arrange dust filter screen in air purifier system Differential static pressure acquisition module, host computer and fault alarm；

Second step: set up data acquisition and recording system；

Third step: make air purifier run continuously in experimental situation, host computer monitors air purifier system in real time simultaneously Differential static pressure P (k) of the dust filter screen of system and ambient temperature T (k), k represents the current time of running, and utilizes host computer data acquisition The total duration run with record system record air purifier；

4th step: use modification method based on ambient temperature T (k) that differential static pressure P (k) is revised in real time, obtain same Revised differential static pressure P ' (k) under reference temperature value；

5th step: determine the differential static pressure threshold values β of fault alarm when dust filter screen lost efficacy；

6th step: perform air purifier dust filter screen failure detection according to differential static pressure threshold values β.

Dust filter screen inefficacy differential static pressure detection method based on temperature adjustmemt the most according to claim 1, it is characterised in that institute State in the 4th step, use modification method based on ambient temperature T (k) that differential static pressure P (k) is revised in real time and include: calculate k Revised differential static pressure P ' (k) in moment is N >=1 in formula, T (k) represents ambient temperature.

Dust filter screen inefficacy differential static pressure detection method based on temperature adjustmemt the most according to claim 1, it is characterised in that institute State in the 6th step and include according to differential static pressure threshold values β execution air purifier dust filter screen failure detection: host computer judges current The size of residual error e (k) in moment=| | P ' (k)-P ' (0) | | and differential static pressure threshold values β, when residual error e (k) is more than differential static pressure threshold values β Time, fault alarm i.e. sends warning.