JP7336629B2 - heat exchange ventilator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchange ventilator for ventilating a room by discharging indoor air to the outdoors and supplying outdoor air to the room.

Conventionally, as this type of ventilation device, there is known a ventilation device in which an air supply filter is provided at an outdoor air inlet for taking in outdoor air, and dust, sand, dust, insects, etc. contained in the outdoor air are removed (see, for example, patent documents 1). However, when used for a long period of time, the air supply filter becomes clogged. If the air supply filter becomes clogged, there is a risk that the power consumption of the air supply motor that drives the air supply fan will increase rapidly in order to ensure a predetermined amount of air supply. Furthermore, there is also a possibility that the performance of the ventilator cannot be obtained due to a decrease in the amount of supplied air. However, it is difficult for the user to notice that the air supply filter is clogged.

In order to solve such a problem, the ventilator described in Patent Document 1 stores the initial values of the current and/or rotation speed of the air supply motor adjusted so that the air volume is constant in the initial stage. there is Then, when the difference between the current and/or rotation speed of the air supply motor adjusted so that the air volume becomes constant again and the initial value of the stored current and/or rotation speed is equal to or greater than a predetermined value, It notifies that the air supply filter is clogged.

JP 2014-105927 A

However, in the ventilation device of Patent Document 1, clogging occurs when the static pressure in the duct accidentally changes greatly due to an environment where a strong wind is blowing outdoors or when the door is opened and closed indoors. There was a possibility that an initial value for determination was acquired. In such a case, the stored initial value of the charge motor current and/or speed will be a value that is significantly different from the charge motor current and/or speed that can be adjusted in the initial stage. There is a fear that the clogging of the air filter cannot be correctly detected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchange ventilator capable of accurately detecting clogging of an air supply filter.

In order to achieve this object, the heat exchange ventilator of the present invention comprises a housing having an outdoor air inlet, an indoor air outlet, an indoor air inlet, and an outdoor air outlet; A heat exchange element that exchanges heat with indoor air sucked from an air intake, and a heat exchange supply that supplies the outdoor air sucked from the outdoor air intake to the room from the indoor air supply opening via the heat exchange element. a heat exchange exhaust air passage through which indoor air sucked from the indoor air inlet is exhausted to the outside from the outdoor air outlet via the heat exchange element; an air supply fan that supplies air to the air supply, an exhaust fan that is provided in the heat exchange exhaust air passage and exhausts air to the outside, and an air supply that is provided in the heat exchange air supply air passage and purifies the outdoor air. A filter and a control unit for controlling the operation of the air supply fan and the exhaust fan, the control unit controlling the number of rotations of the air supply fan when the rotational speed of the air supply fan continues to exceed a predetermined threshold for a predetermined measurement time. The number of times is calculated as an integrated value, the clogging state of the air supply filter is determined based on the integrated value, and when the control unit determines the clogging state of the air supply filter, the clogging of the air supply filter The control unit reduces the number of revolutions of the exhaust fan when determining that the air supply filter is clogged.

According to the heat exchange ventilator of the present invention, the controller calculates the number of times the number of rotations of the air supply fan continues to exceed a predetermined threshold value for a predetermined measurement time as an integrated value, and integrates it into the integrated value. If the value is greater than or equal to a predetermined value, it is notified that the air supply filter is clogged. As a result, it is possible to obtain the effect that the clogging of the air supply filter can be detected with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows roughly the heat exchange ventilator which concerns on 1st Embodiment of this invention. 4 is a flowchart showing clogging determination processing executed by a control unit;

The heat exchange device of the present invention comprises a housing having an outdoor inlet, an indoor outlet, an indoor inlet, and an outdoor outlet, and outdoor air sucked from the outdoor inlet and indoor air sucked from the indoor inlet. a heat exchange element that exchanges heat with the outdoor air inlet, a heat exchange supply air passage through which the outdoor air sucked from the outdoor air inlet is supplied to the room from the indoor air inlet via the heat exchange element, and from the indoor air inlet A heat exchange exhaust air passage through which the sucked indoor air is exhausted to the outside from an outdoor exhaust port via the heat exchange element, and an air supply fan provided in the heat exchange air supply air passage for supplying air to the room. and an exhaust fan provided in the heat exchange exhaust air passage for exhausting air to the outside, an air supply filter provided in the heat exchange air supply passage for purifying the outdoor air, the air supply fan and the A control unit for controlling operation of the exhaust fan is provided, and the control unit calculates the number of times when the number of rotations of the air supply fan continues to exceed a predetermined threshold value for a predetermined measurement time as an integrated value, a notification unit that determines the clogging state of the air supply filter based on the integrated value, and notifies the clogging state of the air supply filter when the control unit determines the clogging state of the air supply filter; there is

With this configuration, the number of times the number of rotations of the air supply fan continues to exceed a predetermined threshold for a predetermined measurement time is calculated as an integrated value, and when the integrated value is equal to or greater than the predetermined value, the air supply is performed. It notifies that the air filter is clogged. As a result, even in environments where there is a strong wind blowing outdoors, or where the static pressure inside the duct accidentally changes significantly due to the opening and closing of the door indoors, the clogging of the air supply filter can be notified. It has the effect that it can be performed with high accuracy.

The control unit in the present invention may determine that the air supply filter is clogged when the integrated value exceeds a predetermined integrated threshold.

With this configuration, by setting a predetermined integrated threshold value that has been measured in advance, it is possible to accurately determine clogging.

Further, the control unit in the present invention may reduce the number of revolutions of the exhaust fan when determining that the air supply filter is clogged.

With this configuration, even when the amount of air supplied is reduced due to clogging of the air supply filter, the number of rotations of the exhaust fan is reduced, thereby maintaining positive pressure in the room and preventing the intrusion of dust and pollen. Prepare.

In addition, the control unit in the present invention may be configured to stop the air supply fan when the integrated value exceeds a second integrated value larger than the integrated threshold value.

As the clogging of the air supply filter progresses, the amount of air supplied by the air supply fan decreases and the sound and vibration increase. By stopping the air supply fan at the point in time, it is possible to suppress noise and vibration.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

(First embodiment)
First, referring to FIG. 1, a heat exchanging ventilator 1 according to a first embodiment of the present invention will be described. FIG. 1 is a schematic diagram schematically showing a heat exchanging ventilator 1. As shown in FIG. The heat exchange ventilator 1 has an outdoor air outlet 4 and an outdoor air inlet 5 on the side of a box-shaped housing (main body) 2, and an indoor air inlet 6 and an indoor air outlet 7 on the side opposite to the side. is provided.

The heat exchange ventilator 1 also includes a heat exchange element 14 that exchanges heat between outdoor air sucked from the outdoor air inlet 5 and the indoor air outlet 7 and indoor air sucked from the indoor air inlet 6 . The heat exchange element 14 constitutes the heat exchange section of the present invention, and the total heat is exchanged between the supply air passing through the heat exchange supply air passage 8 and the exhaust air passing through the heat exchange exhaust air passage 9. Heat exchange is performed by the exchange method. The heat exchange element 14 either supplies all the heat (temperature and humidity) of the exhausted air to the supplied air or supplies all the heat of the supplied air to the exhausted air. In addition, in the present invention, the heat exchange element 14 is not necessarily an essential component, and the heat exchange element 14 may not be provided.

Outdoor air sucked from the outdoor air inlet 5 is heat exchanged through the heat exchange element 14 and supplied to the room from the indoor air outlet 7. Heat exchange between the air supply air passage 8 and the indoor air sucked from the indoor air inlet 6. A heat exchange exhaust air passage 9 is provided for exhausting air to the outside from an outdoor outlet via an element 14 . Fresh outdoor air (outside air, supply air) introduced from the outdoor air inlet 5 and polluted indoor air (exhaust air) introduced from the indoor air inlet 6 are separated from each other by the air supply fan 12 and the exhaust fan 13. It flows through the heat exchange supply air passage 8 and the heat exchange exhaust air passage 9 respectively by operation.

The air supply fan 12 is driven by the control unit 20 and guides the air sucked from the outdoor air inlet 5 to the indoor air outlet 7 through the heat exchange air supply air passage 8 at a predetermined amount of air supplied. The air guided to the indoor air outlet 7 is supplied into the room. On the other hand, the exhaust fan 13 is driven by the control unit 20 and guides the exhaust air sucked from the indoor air inlet 6 to the outdoor air outlet 4 through the heat exchange exhaust air passage 9 at a predetermined exhaust air volume. The air guided to the outdoor air outlet 4 is exhausted outdoors.

An air supply filter 15 is provided at the outdoor air inlet 5 . The air supply filter 15 removes dirt, dust, dust, insects, etc. contained in the outdoor air and prevents them from being introduced into the room.

The heat exchange ventilator 1 is provided with a notification unit 22 and a completion input receiving unit 23 on the outer surface of the housing 2 or at a position away from the housing 2 . The notification unit 22 is composed of, for example, a light-emitting diode, and lights the light-emitting diode when the air supply filter 15 is clogged, and turns off the light-emitting diode when the air supply filter 15 is not clogged, thereby indicating that the air supply filter 15 is clogged. I will notify you.

The completion input reception unit 23 is configured by, for example, a push-type switch. When the user or the maintenance worker completes the maintenance of the air supply filter 15, the push-down switch of the completion input reception unit 23 is pressed, and the input indicating that the maintenance of the air supply filter 15 is completed is performed for heat exchange ventilation. It is accepted by the device 1 .

A control unit 20 that controls the operation of the heat exchange ventilator 1 is provided inside or outside the heat exchange ventilator 1 . The control unit 20, for example, executes constant air volume control for adjusting the current (current value) and/or the rotation speed of the air supply fan 12 so that the air volume is constant. In addition, the control unit 20 executes constant air volume control for adjusting the current (current value) and/or rotation speed of the exhaust fan 13 so that the exhaust air volume is constant.

Further, the control unit 20 determines whether or not the air supply filter 15 is clogged by executing a clogging determination process which will be described later with reference to FIG. 2 .

Next, referring to FIG. 2, clogging determination processing executed by the control unit 20 will be described. FIG. 2 is a flow chart showing the clogging determination process. In this clogging determination process, the controller 20 detects the rotation speed of the air supply fan 12 adjusted so that the air supply air volume is constant at every predetermined time T, and the number of revolutions of the air supply fan 12 is continuously adjusted for a predetermined measurement time and is equal to or higher than a predetermined threshold value. Clogging of the air supply filter 15 is determined by calculating and determining the number of times when it becomes , as an integrated value. The predetermined time T may be every 3 seconds, for example, and may be a time during which the constant air volume control is likely to be stabilized. Further, the predetermined measurement time may be set to, for example, one hour, and the time may be set so as to eliminate the influence of the opening and closing of doors and windows and sudden wind.

Specifically, when the clogging determination process is executed, first, the control unit 20 detects the rotation speed of the air supply fan 12 (S1). As a result, while the rotation speed of the air supply fan 12 is unstable (S2: No), the process of S2 is repeated, and when it is determined that the rotation speed of the air supply fan 12 has stabilized (S2: Yes), S3 to process. That is, the process of S2 waits until the rotation speed of the air supply fan 12, which has been adjusted so that the amount of air supplied is constant, stabilizes.

In the process of S3, it is determined whether or not the current rotation speed rpm_now of the air supply fan 12 is greater than a predetermined rotation speed rpm_LIMIT (S3). Then, if the current rotation speed rpm_now of the air supply fan 12 is smaller than rpm_LIMIT (S4: No), the integrated value COUNT_now is set to "0" (S9) and the process returns to S1. The predetermined rotation speed rpm_LIMIT may be, for example, the maximum rotation speed at which the supply fan 12 can adjust the supply air volume to be constant.

On the other hand, if it is determined that rpm_now is greater than rpm_LIMIT (S4: Yes), the integrated value COUNT_now is incremented by "1" and the process proceeds to S5. That is, the process of S3 waits until rpm_now becomes greater than rpm_LIMIT.

In the processing of S5, it is determined whether or not the integrated value COUNT_now is greater than a predetermined duration (number of times) FIL_TIMER1 (S5). Then, if the integrated value COUNT_now is smaller than FIL_TIMER1 (S5: No), the process returns to S1. On the other hand, when it is determined that COUNT_now is greater than FIL_TIMER1 (S5: Yes), the light-emitting diode of the notification unit 22 is turned on to notify that the air supply filter 15 is clogged (S6), and the process of S7 is performed. Move to At this time, the clogging may be notified and the rotational speed of the exhaust fan 13 may be reduced.

In S6, the number of rotations of the exhaust fan 13 is decreased stepwise or to a predetermined number of rotations every predetermined time T. As a result, even when the air supply filter 15 is clogged and the air volume is reduced, it is possible to maintain a positive pressure in the room and prevent dust and pollen from entering from the outside.

Also, FIL_TIMER1 is set to 175 times, for example, and clogging is detected when the state where rpm_now is greater than rpm_LIMIT continues for one week, thereby preventing malfunction due to changes in air density due to typhoons or temporary climate changes. becomes possible.

In the processing of S7, it is determined whether or not the maintenance of the air supply filter 15 has been completed from the completion input reception unit 23 (S7). Then, when the completion of maintenance is input from the completion input reception unit 23 (S7: Yes), the light emitting diode of the notification unit 22 is turned off, and the notification that the air supply filter 15 is clogged is terminated (S8). ). At this time, the rotation speed of the exhaust fan 13 may be returned to the initial state. On the other hand, if the completion of maintenance is not input from the completion input reception unit 23 (S7: No), the process proceeds to S11.

In the processing of S11, it is determined whether or not the integrated value COUNT_now is greater than a predetermined duration (number of times) FIL_TIMER2 (S11). Then, if the integrated value COUNT_now is smaller than FIL_TIMER2 (S11: No), the process returns to S1. On the other hand, if it is determined that COUNT_now is greater than FIL_TIMER2 (S11: Yes), the air supply fan 12 is stopped (S12). As a result, it is possible to prevent excessive vibration and noise caused by the air supply fan 12 whose output has increased due to the constant air volume control. At this time, the rotation speed of the exhaust fan whose rotation speed was reduced in the process of S6 may be returned to the original ventilation air volume setting. FIL_TIMER2 may be, for example, 720 times, and abnormal clogging may be detected when rpm_now is greater than rpm_LIMIT for one month.

Next, in the process of S13, it is determined whether or not the maintenance of the air supply filter 15 has been completed from the completion input receiving section 23 (S13). When the completion of maintenance is input from the completion input reception unit 23 (S13: Yes), the light emitting diode of the notification unit 22 is turned off, and the notification that the air supply filter 15 is clogged is terminated (S14). ). At this time, the operation of the air supply fan 12 is started. On the other hand, if the completion of maintenance is not input from the completion input reception unit 23 (S13: No), the process returns to S1. That is, until the maintenance is completed, the stop of the air supply fan 12 or the reduction of the rotation speed of the exhaust fan 13 is continued.

Although the air supply filter 15 is described in the present embodiment, clogging of the exhaust filter may be detected by providing an exhaust filter on the side of the exhaust fan 13 and performing similar filter clogging.

The present invention has been described above based on the embodiments, but the present invention is not limited to the above-described embodiments, and it is easily understood that various modifications and improvements are possible without departing from the scope of the present invention. It can be inferred. Further, the numerical values given in each of the above embodiments are examples, and it is naturally possible to employ other numerical values.

INDUSTRIAL APPLICABILITY The heat exchange ventilator according to the present invention is effective as a heat exchange ventilator that ventilates a room by discharging indoor air to the outside and supplying outdoor air to the room.

1 heat exchange ventilator 2 housing 4 outdoor outlet 5 outdoor inlet 6 indoor inlet 7 indoor outlet 8 heat exchange supply air passage 9 heat exchange exhaust air passage 10 air supply motor 12 air supply fan 13 exhaust fan 14 heat exchange Element 15 Air supply filter 20 Control unit 22 Reporting unit 23 Completion input receiving unit

Claims (3)

a housing having an outdoor inlet, an indoor outlet, an indoor inlet, and an outdoor outlet;
a heat exchange element for exchanging heat between outdoor air sucked from the outdoor air inlet and indoor air sucked from the indoor air inlet;
a heat exchange supply air passage through which the outdoor air sucked from the outdoor air intake is supplied to the room from the indoor air supply opening via the heat exchange element;
a heat exchange exhaust air passage through which the indoor air sucked from the indoor air inlet is exhausted to the outside from the outdoor air outlet via the heat exchange element;
an air supply fan provided in the heat exchange air supply path for supplying air to the room;
an exhaust fan provided in the heat exchange exhaust air passage for exhausting air to the outdoors;
a supply air filter provided in the heat exchange supply air passage for purifying outdoor air;
A control unit for controlling the operation of the air supply fan and the exhaust fan,
The control unit calculates, as an integrated value, the number of times the number of rotations of the air supply fan continues to exceed a predetermined threshold value for a predetermined measurement time, and based on the integrated value, clogging of the air supply filter is detected. determine the state of
A notification unit that notifies the clogged state of the air supply filter when the control unit determines the clogged state of the air supply filter ,
The heat exchange ventilator according to claim 1, wherein the controller reduces the number of revolutions of the exhaust fan when determining that the air supply filter is clogged. 2. The heat exchange ventilator according to claim 1, wherein the controller determines that the air supply filter is clogged when the integrated value exceeds a predetermined integrated threshold. 3. The heat exchange ventilator according to claim 2 , wherein the controller stops the air supply fan when the integrated value exceeds a second integrated value larger than the integrated threshold value.

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