JPS60147211A - Judgement of exchange period of air filter - Google Patents

Abstract

PURPOSE:To make it possible to accurately judge the life of an air filter, by measuring the input value of an fan motor changing by the increase in pressure loss due to the clogging of the filter. CONSTITUTION:The input value W of the induction motor 5 for driving a sirocco fan 4 is always read by an external unit 6 and compared with the predetermined input value W2 preset to the external unit 6 and, when the input value W of the fan motor 5 exceeds said set value W2, a lamp 7 is lighted by the signal from the external unit 6 to issue an alarm. The input value of the fan motor changing by the increase in pressure loss due to the clogging of the filter is measured and a point of time, when said measured input value exceeds the input value in the preset amount showing the life of the air filter, is detected to judge the exchange period of the air filter. The life setting alteration of the filter cn be performed easily.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention accurately determines the replacement period C (hereinafter referred to as "life") due to clogging of an air filter (hereinafter referred to as "filter") incorporated in, for example, wall-to-wall equipment. ◎ [Prior art] Conventionally, the most common method for determining the lifespan of nitrogen filters was visual inspection, but this Due to subjective judgment, judgment is often wrong, especially in the case of used filters that cannot be regenerated. If a 7-ton container was used, resulting in a significant decline in movement and overripening due to a reduction in air volume, or if the filter was built into the container after one use, the filter should be removed one by one. aX
It had the disadvantage of being forced to do the troublesome work of releasing υ◎In order to overcome these deficiencies,
Conventionally, as shown in Figure 1, a light emitter (2) and a receiver (31) are placed before and after a filter (1), and the light emitted from the emitter (21) passes through the filter 111. Attempts have been made to detect the lifespan of Filter II+ by reducing the amount of light entering the receiver (3). Although this method is much better than the former visual inspection, it only observes a local part of Filter 11. No, floodlight f21
However, due to reasons such as the possibility of light reduction due to dirt on the optical lens (3), this method was by no means reliable, and the judgment was often incorrect.

Both methods attempt to determine the existence of filter 11) based on the degree of contamination of filter +l+, and their ultimate purpose is to remove filter I1.
The relationship between the amount of Ml (6 or ability) determined by the d fortune of 1 is not clear (8), so it can be said that it is extremely inaccurate as a leveraging method.Other methods A method has been attempted in which the life of the filter '!+ is increased by 2 times depending on the continuous transmission time of the generator. ) The error is significant, except in special cases - not for personal use.

[Summary of the invention]

This invention was made with the purpose of completely improving this complicated original method in x points, and was made by measuring the input power of the fan sweater, which is ashed due to the increase in pressure loss due to white filter clogging. , the meti node of the filter is fJtJ
This method is based on the conventional method of making a judgment.

[,・B Akinozu Example]

FIG. 2 shows an embodiment of the present invention, in which the sirocco fan +41 k +d% is moved by the induction motor f51 (D input (II W is always the external unit 16)), and the external unit ( 6), and input 11@w of 7 motor (5) is the input value w2) l1fI
When Wsk is exceeded, the lamp (7) is turned on by a signal from the external unit 16) and an i-alarm is issued. Figure 3 shows 1. M = 2 This is the result of a central experiment carried out using an apparatus Q having the same size as in Fig. 2, and the present invention will be described in detail below based on this result.

1m horizontal to the graph in Figure 3 VC is sirocco fan +41
Garano Nagi Zuigo, 'i, lil Shinyu ni (Shuttle 1f EPs
, and 1 of the fan motor (5)! :! 1 rollover N and 1 input DC are restricted.

Now, the initial pressure loss of 2° is 23.
#lII When Ay, use, :g(Qa l1et 7
change n, and the rotation at that time f Nr? ”110i
) Orpm human power 11 [iw+ is s a (w).

If we assume that the filter Ill's Kotobuki 6O total pigeon quantity trajectory is down to 80:
, 7 = 4.9rrl/frdn = The life is reached when QaiK is reached, and the input value of the fan motor (5) at that time.
! F'i70 (wl).The pressure loss due to the self-supporting of the shunted filter Ill is PS2 Pe+=8
．． 1.1rtnAJ fan motor (5) rotation speed N2
- Nl = goo rpm liI! That's 11 JD.

This input, IM W2 k 191j external unit (
6), and carefully compare it with the changing input 1 W of the fan motor (5), you can definitely know the life of the filter 111. Method 0 looks at local dirt on the filter I11 and reduces its lifespan.
Bouncing anastomoses and thick filters) 1! In order to fully understand each insect and mouse that passes through the whole world, filter Ill
Nobifp! 141 constant is more accurate and suitable for actual use. -Also, it has the advantage that the lifespan of the filter 11) can be easily extended by changing the filter width.

By the way, in the above explanation, sirocco fan (4) all + I
I explained about the main input 4 Rishu 1 Zhang's "Yangdai lζ" that I used for J, but this +6 Ming? Needless to say, the fan used in the pond can be used to determine the lifespan of the filter in the pond.

〔Effect of the invention〕

As explained above, the present invention is designed to determine the fan motor input value k1llJ, which changes due to the increase in pressure loss due to the replacement of the air filter, and to maintain the service life of the air filter in which the input value is predetermined for one generation. By detecting the point in time when the input value at the airflow rate exceeds the input value and determining that it is time to replace the air filter, the lifespan of the filter can be determined based on the actual airflow rate that passes through the entire air filter (i-). However, it has the effect of making it possible to change the life of the filter and its life cycle easily by controlling the input value.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a fan unit to which all conventional methods have been applied, FIG. 2 is a cross-sectional view of a fan unit according to an embodiment of this invention, and FIG. It is a graph showing English test results according to one example. In the figure, 111 is an air filter, (5) is a fan motor, and (6) is an external unit. In addition, in the figure, the same-acoustic symbol is the same or the t partial sound. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Scope of Claims] At least seven fans driven by an air filter and an induction motor are used, and all input values to the fan motor are measured, and all input values are compared with the human power 1d and a preset input value. The measured input value is the input value set in advance.
A method for determining when it is time to replace an air filter, the method determining that it is time to replace the air filter when the value exceeds .