JP5041383B2 - Air volume sensor device for septic tank management - Google Patents

Description

  The present invention relates to a septic tank management air volume sensor device for detecting an abnormality in air supply due to a blower failure or the like in a septic tank in which aeration air is sent by a blower.

  Normally, aeration air is sent to the septic tank by a blower. However, if air is not sent due to a failure of the blower or the like, aerobic microorganisms in the septic tank cannot be activated and normal purification cannot be performed. Therefore, the abnormality of the blower in the septic tank is detected by a sensor so that it can be dealt with immediately.

  For example, Patent Document 1 describes that a pressure sensor is provided at a discharge port of a blower, and a notification is given by turning on an alarm lamp when the discharge pressure of discharged air becomes a minimum pressure or less or a maximum pressure or more. Yes. Patent Document 2 describes that an air volume (speed) sensor can be used in addition to the pressure sensor for detecting an abnormality in the septic tank, but there is no specific description of the air volume sensor.

  Non-Patent Document 1 describes a commercially available gas flow sensor. The measurement principle is that the heat of the heater spreads evenly when there is no wind, but if there is a flow, the upstream is cooled by the flow, and the downstream is heated by the heat of the upstream heater, so that the temperature distribution before and after the heater is Since it changes in proportion to the flow rate, the flow rate is obtained from this ratio.

JP 2002-1343 A JP 2008-6354 A

“Amplifier separation type gas flow sensor FD-V40 series”, [online], Keyence Corporation, [searched January 8, 2009], Internet <URL: http://www.keyence.co.jp/atsuryoku / ryuryou / fd_v40 / ＞

  Since the pressure sensors as described in Patent Documents 1 and 2 have a complicated structure and are very expensive, it is practically difficult to install them in all small septic tanks such as household septic tanks. Further, since there is no specific description of the air volume sensor described in Patent Document 2, it is unclear what configuration the air volume is actually detected. Furthermore, the flow sensor of Non-Patent Document 1 is also complicated in structure and expensive.

  Accordingly, an object of the present invention is to provide an air volume sensor device for septic tank management that has a simple structure and is inexpensive.

  The air volume sensor device for septic tank management according to the present invention is connected in the middle of the air supply path to the septic tank, the case where the air flowing in from the inflow port flows out from the outflow port, and the rotation shaft connects the inflow port and the outflow port. Rotating blades disposed in a direction perpendicular to the flow path and having a rotation axis disposed at a position deviating from the cross section of the flow path connecting the inlet and the outlet, and the rotating blade chamber in the case containing the rotating blades And an encoder for detecting the number of rotations of the rotating shaft.

  According to the air volume sensor device of the present invention, when air is sent in the air supply path to the septic tank, the rotating blades are rotated in the rotating blade chamber by the flow of air, and the rotational speed of the rotating blades is It is detected by the encoder through the rotating shaft.

  The air volume sensor device of the present invention preferably includes an abnormality detection device that detects an abnormality when the rotational speed detected by the encoder fluctuates by a predetermined width or more from a set value. Thereby, since abnormality is detected by the fluctuation range from the air volume during normal operation, it can be used regardless of the specifications of the septic tank to be managed.

  Further, it is desirable that the abnormality detection device detects an abnormality only when a variation of the set value over a predetermined width continues for a predetermined time. As a result, even if a blower stop occurs temporarily due to an instantaneous power failure or the like, it will not be detected as an abnormality when it returns within a predetermined time, and erroneous detection of the abnormality can be prevented.

  The encoder is preferably composed of a rotating disk fixed to the rotating shaft and a photosensor that detects the number of rotations of the rotating disk. This makes it possible to detect the rotational speed of the rotating disk without applying a load to the rotating disk in a non-contact manner.

(1) Connected in the middle of the air supply path to the septic tank, the case where the air flowing in from the inflow port flows out from the outflow port, and the rotating shaft arranged in a direction perpendicular to the flow path connecting the inflow port and the outflow port Rotating blades disposed at positions away from the cross section of the flow path connecting the inlet and the outlet, the rotating blade chamber in the case housing the rotating blades, and the number of rotations of the rotating shaft are detected. The air volume sensor device consisting of an encoder that can detect the rotational speed of the rotating blades with a simple structure at low cost, and can detect abnormalities such as blower failure and clogging of the air supply path to the septic tank. , Can respond immediately.

(2) By including an abnormality detection device that detects an abnormality when the rotation speed detected by the encoder fluctuates by a predetermined width or more from the set value, an abnormality is detected based on the fluctuation range from the air volume during normal operation. It can be used regardless of the specifications of the septic tank, and can be applied to many types of septic tanks at low cost.

(3) Since the abnormality detection device detects an abnormality only when a fluctuation within a predetermined range of the set value continues for a predetermined time, even if a blower stop occurs temporarily due to an instantaneous power failure or the like, within a predetermined time When it returns to, it is not detected as an abnormality, and it is possible to prevent erroneous detection of the abnormality.

(4) Since the encoder is composed of a rotating disk fixed to the rotating shaft and a photosensor for detecting the number of rotations of the rotating disk, a load is applied to the rotating disk in a non-contact manner. The number of rotations of the rotating disk can be detected without any problems, so it is possible to detect abnormalities such as blower failures and clogging of the air supply path to the septic tank, with little effect on the air being pumped to the septic tank. It becomes.

It is a schematic block diagram of the air volume sensor apparatus in embodiment of this invention. It is the perspective view which abbreviate | omitted the upper case of the air quantity sensor main body of FIG. It is a top view of the air volume sensor main body of FIG. FIG. 4 is a front view of FIG. 3. FIG. 5 is a right side view of FIG. 4. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

  FIG. 1 is a schematic configuration diagram of an air volume sensor device for septic tank management according to an embodiment of the present invention. 2 is a perspective view in which the upper case of the air flow sensor main body of FIG. 1 is omitted, FIG. 3 is a plan view of the air flow sensor main body of FIG. 1, FIG. 4 is a front view of FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line BB in FIG.

  In FIG. 1, an air volume sensor device for septic tank management in an embodiment of the present invention includes an air volume sensor main body 1 connected in the middle of a hose H as an air supply path for supplying air to a septic tank R by a blower B, and an air volume. A microcomputer (hereinafter referred to as “microcomputer”) 2 to which a detection signal of the sensor main body 1 is input, a modem 3 connected to the microcomputer 2, and a personal computer for septic tank management (hereinafter referred to as “personal computer”). ) 4 and a modem 5 connected to the personal computer 4.

  When the microcomputer 2 detects an abnormality based on the detection signal input from the air flow sensor main body 1, the microcomputer 2 is an abnormality detection device that notifies the personal computer 4 through the communication line via the modem 3. The personal computer 4 receives the notification from the microcomputer 2 through the modem 5 and notifies the administrator of the occurrence of an abnormality by displaying on the display 4a, an alarm, or the like.

  As shown in FIGS. 2 to 7, the air volume sensor main body 1 includes a rotary blade 11 and an encoder 12 in a case 10. The case 10 includes an upper case 10a and a lower case 10b. The case 10 is provided with nipples 13a and 13b for connecting the hose H. One of the nipples 13a and 13b is connected to the hose H on the blower B side, and the other is connected to the hose H on the septic tank R side. In this embodiment, the opening on the nipple 13a side is described as the inflow port 14a, and the opening on the nipple 13b side is described as the outflow port 14b. However, the air flow sensor main body 1 can be used in any direction.

  Further, the case 10 is provided with a rotary blade chamber 15 in which the rotary blade 11 is accommodated and an encoder chamber 16 in which the encoder 12 is accommodated. The rotary blade chamber 15 and the encoder chamber 16 are separate chambers. The rotating shaft 11 a of the rotary blade 11 is disposed in a direction perpendicular to the flow path connecting the inlet 14 a and the outlet 14 b and is rotatably supported by bearings 17 at both ends of the rotary blade chamber 15. The rotating shaft 11 a extends through the rotating blade chamber 15 to the encoder chamber 16. A rotating disk 12a constituting the encoder 12 is fixed to the tip of the rotating shaft 11a.

  The rotary blade 11 is configured by four substantially semicircular plates 11b erected on the rotation shaft 11a at intervals of 90 ° around the rotation direction. Each substantially semicircular plate 11b is provided in parallel to the axis of the rotating shaft 11a. The rotary blade chamber 15 is formed in a shape that follows the shape of the rotary blade 11 in a sectional view of FIG. Moreover, the rotating shaft 11a is arrange | positioned in the position remove | deviated from the flow-path cross section which connects the inflow port 14a and the outflow port 14b. Therefore, the air flowing in from the inflow port 14a collides with one of the rotating blades 11 as shown in FIG. 6, and flows out from the outflow port 14b by pushing the rotating blades 11 around the rotating shaft 11a.

  The encoder 12 includes the above-described rotating disk 12a and a photosensor 12b that detects the number of rotations of the rotating disk 12a. The photo sensor 12b emits light from one side with the rotating disk 12a interposed therebetween and receives light from the other side. A plurality of through holes are formed in the rotating disk 12a at predetermined intervals along the outer periphery. The encoder 12 detects the number of rotations by counting the passage of the through hole of the rotating disk 12a rotated by the photosensor 12b.

  In the air volume sensor device having the above configuration, the air volume sensor main body 1 is first installed in the middle of the hose H, the fluctuation range of the air volume during normal operation is measured, and the initial set value and the allowable fluctuation range are set based on the measurement result. . That is, an initial setting value and an allowable fluctuation range of the rotation speed detected by the encoder 12 during normal operation are set. The microcomputer 2 is abnormal when the rotation speed detected by the encoder 12 fluctuates by a predetermined width or more from a preset setting value, that is, when a fluctuation of, for example, −30% or less or 10% or more occurs from the set air volume Set to be judged.

  In the present embodiment, the microcomputer 2 is set to detect an abnormality when the fluctuation continues for a predetermined time (for example, 30 minutes or more) in order to prevent erroneous detection during an instantaneous power failure.

  According to this air volume sensor device, when air is sent to the septic tank R by the hose H, the rotating blade 11 of the air volume sensor body 1 is rotated in the rotating blade chamber 15 by the flow of this air, and this rotating blade 11 is detected by the encoder 12 through the rotating shaft 11a. When the blower B is broken or the hose H is clogged, the air flow is decelerated or stopped, so the rotational speed of the rotary blade 11 is reduced or becomes zero.

  At this time, the microcomputer 2 detects an abnormality as described above based on the detection signal input from the air volume sensor main body 1. When the microcomputer 2 detects an abnormality, the microcomputer 2 notifies the personal computer 4 through the modem 3 via a communication line. The personal computer 4 receives the notification from the microcomputer 2 through the modem 5 and notifies the administrator of the occurrence of an abnormality by displaying on the display 4a, an alarm, or the like.

  As described above, according to the air volume sensor device of the present embodiment, it is possible to detect an abnormality in the supply of air for aeration at a low cost with a simple structure, and there is a malfunction in the blower or clogging of the air supply path to the septic tank. It is possible to detect abnormalities such as and respond immediately.

  In particular, in the air volume sensor main body 1 according to the present embodiment, the encoder 12 includes a rotating disk 12a fixed to the rotating shaft 11a of the rotating blade 11 and a photosensor 12b that detects the number of rotations of the rotating disk 12a. Therefore, it is possible to detect the rotational speed of the rotating disk 11 without applying a load to the rotating disk 11 in a non-contact manner, and hardly affect the air pressure-fed to the septic tank R.

  The air volume sensor device in the present embodiment is configured such that the air volume sensor main body 1, the microcomputer 2 and the modem 3 are installed in the septic tank R, and the personal computer 4 and the modem 5 are installed in a place away from the septic tank R. It is also possible to install the main body 1 in the septic tank R and send a detection signal output from the air volume sensor main body 1 to the microcomputer 2 or the personal computer 4 installed at a location away from the septic tank R to detect an abnormality. is there.

  The air volume sensor device for septic tank management of the present invention is useful as a device for detecting an abnormality in air supply due to a blower failure or the like in a septic tank in which aeration air is sent by a blower.

1 Airflow sensor body 2 Microcomputer
3,5 Modem 4 Personal computer (PC)
DESCRIPTION OF SYMBOLS 10 Case 11 Rotating blade 11a Rotating shaft 11b Approximate semicircular plate 12 Encoder 12a Rotating disk 12b Photo sensor 13a, 13b Nipple 14a Inlet 14b Outlet 15 Rotating blade chamber 16 Encoder chamber 17 Bearing

Claims (4)

A case connected in the middle of an air supply path for supplying aeration air to the septic tank by a blower, and causing the air flowing in from the inlet to flow out from the outlet;
A rotation axis is arranged in a direction perpendicular to the flow path that connects the inlet and the outlet in a straight line , and the rotation axis deviates from a flow path cross section that connects the inlet and the outlet in a straight line. Four substantially semicircular plates standing on the rotation axis at 90 ° intervals around the rotation direction, and each of the approximately semicircular plates is an axis of the rotation shaft. Rotating blades provided in parallel with
A rotary blade chamber in the case in which the rotary blade is accommodated , and a cross section cut in a direction perpendicular to a flow path that connects the inlet and the outlet in a straight line along the axis of the rotary shaft. , A shape along the shape of the rotary blade, and a rotary blade chamber formed so that a gap with the rotary blade is extremely narrow ,
An air volume sensor device for septic tank management, comprising an encoder for detecting the rotational speed of the rotating shaft.
  The air volume sensor device for septic tank management according to claim 1, further comprising an abnormality detection device that detects an abnormality when a rotational speed detected by the encoder fluctuates by a predetermined width or more from a set value.   The air volume sensor device for septic tank management according to claim 2, wherein the abnormality detection device detects an abnormality only when a variation of the set value over a predetermined width continues for a predetermined time.   The septic tank management according to any one of claims 1 to 3, wherein the encoder includes a rotating disk fixed to the rotating shaft and a photosensor that detects the number of rotations of the rotating disk. Airflow sensor device.

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