JP2013155890A - Heat exchange ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange ventilation device that prevents an outside air of fog and high humidity from being taken in, and also prevents ventilation from being unnecessarily stopped.SOLUTION: A heat exchange ventilation device forms an air supply passage for supplying an outside air into a room via a heat exchanger using an air supply fan, and an air exhaust passage for exhausting an indoor air outside the room via the heat exchanger using an air exhausting fan. The device includes: a fog entry determination means for determining presence of fog using a humidity sensor for detecting humidity of the outside air disposed in the air supply passage; and a stop period adjustment means for adjusting a time length of a stop period of an intermittent operation comprising a stop period of stopping the air supply fan and the air exhausting fan when the fog entry determination means detects generation of the fog, and a detection period of operating the air supply fan for a time length shorter than the stop period for detecting the humidity of the outside air after the stop period.

Description

  The present invention relates to a heat exchange ventilator for exchanging heat between two fluids of a ventilator for supplying and exhausting air mainly used in the air conditioning field, in high humidity of air supply in climatic conditions of outside air, particularly in suction of fog. This relates to the prevention of defects.

  Inhalation of mist in an air supply type ventilation fan generates water due to condensation or condensation of the mist inside the product. In some cases, problems such as wetting the ceiling occurred.

  For this reason, in the conventional ventilation fan, when the outside air humidity detected by the humidity detector provided outside the room exceeds a predetermined value stored in advance in the control circuit, the fan is stopped and fog is prevented from entering. Is published.

Japanese Patent Laid-Open No. 08-014611

  However, with the recent increase in needs for 24-hour ventilation, the possibility of supplying mist and high-humidity air that frequently occur in the morning and evening has further increased, so in the conventional technology for determining operation / stop at ambient air humidity, The problem was that ventilation was stopped unnecessarily.

The present invention has been made in view of the above, and it is an object of the present invention to provide a heat exchange ventilator that can suppress the period during which ventilation is stopped when it takes in fog or high humidity outside air to the minimum necessary. To do.

  In order to solve the above-described problems and achieve the object, in the heat exchange ventilator of the present invention, a box is provided with a built-in air supply fan, an exhaust air blower, and a heat exchanger. The outdoor air is sucked in from the outside suction port, the indoor air is sucked in from the indoor suction port by the air supply air passage that exhausts the air from the indoor side outlet through the heat exchanger, and the exhaust fan, and the outdoor outlet is passed through the heat exchanger In a heat exchange ventilator with an exhaust air path that exhausts air from the outside to the room, a humidity sensor that is installed in the supply air path and detects the humidity of the outdoor air, and a mist intrusion that determines the presence or absence of fog by the humidity detected by the humidity sensor When the generation of mist is detected by the determination means and the mist intrusion determination means, a stop period for stopping the air supply blower and the exhaust blower and a stop period for detecting the humidity of the outdoor air after the stop period And stop period adjusting means for adjusting the time length of the stop period of the intermittent operation consists of a short time detection period for operating the length air supply blower are those with a.

  Since it is possible to adjust the duration of the stop period in intermittent operation control, the ventilation operation restriction due to outdoor humidity conditions (especially when the intake of fog or high humidity air is taken in) is reduced as much as possible, and ventilation is performed. It is possible to maintain as much as possible and make the indoor environment comfortable.

This figure is the perspective view of the state which opened the upper cover which shows the heat exchange ventilation apparatus equipped with the heat exchanger. This figure is a cross-sectional view seen from the opening 15 side of FIG. This figure is a block diagram of the control unit. This figure is a part (first half) of the flowchart showing the control procedure of the control unit. This figure is a part (second half) of the flowchart showing the control procedure of the control unit. This figure is a table of stop time values Tn in intermittent operation control. This figure is an explanatory diagram showing the accumulated time below the second humidity threshold and the stage transition in the intermittent operation control.

Embodiments of a heat exchange ventilator according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a heat exchange ventilator equipped with a heat exchanger with an upper lid opened. FIG. 2 is a cross-sectional view seen from the opening 15 side of FIG. The heat exchange ventilator 50 has a main body box 1 that forms an outer shell, and has an indoor air inlet 4 and an indoor air outlet 6 on one of the opposing side surfaces of the main body box 1, and a chamber on the other side. An outer suction port 5 and an outdoor air outlet 7 are provided. Provided in the heat exchanger 12 made of paper or the like provided between the indoor-side suction port 4, the outdoor-side suction port 5 and the outdoor-side air outlet 7, and the indoor-side air outlet 6 so as to cross each other and perform total heat exchange. The air supply passage (supply air passage) 9 (including the outdoor side intake port 5 and the indoor air outlet 6) and the exhaust passage (exhaust air passage) 8 (the indoor side air inlet 4 and the outdoor air outlet 7) are provided. I have. The humidity sensor 2 and the temperature sensor 3 are installed inside the air supply passage 9 as shown in the figure, and the air condition monitoring of the air supply D is performed by the humidity sensor 2 and the temperature sensor 3.

  And in the supply air passage 9 and the exhaust air passage 10 provided in the main body box 1, the supply air blower 11 and the exhaust blower 10 are respectively configured by blades 21 and an electric motor 26 that form a supply air flow or an exhaust flow. On the other hand, it is provided to be detachable from the blade casing 31 provided in the air supply passage 9 and the exhaust passage 8 and the opening 15 provided on the other side surface of the main body, and exchanges heat between the air supply air flow and the exhaust air flow. The heat exchanger 12 is provided. The opening 15 can be opened and closed by a maintenance cover 28 and is closed.

Next, the operation will be described. In the heat exchange ventilator 50 configured as described above, for air conditioning ventilation using the heat exchanger 12, by operating each of the air supply blower 11 and the exhaust blower 10, the room air can be used as a duct. Through the indoor side suction port 4 as shown by arrow A, passes through the heat exchanger 12 and the exhaust passage 8 as shown by arrow B, and is blown out from the outdoor air outlet 7 by the exhaust fan 10 as shown by arrow C. The

  Further, the air is sucked from the outdoor suction port 5 through a duct (not shown) as indicated by arrow D, passes through the heat exchanger 12 and the air supply passage 9 as indicated by arrow E, and is supplied indoors by the air supply blower 11. It blows out from the blower outlet 6 as shown by the arrow F, and is supplied into the room through a duct (not shown). At this time, in the heat exchanger 12, heat exchange is performed between the exhaust flow and the supply air flow, and the exhaust heat is recovered to reduce the cooling / heating load. The humidity sensor 2 and the temperature sensor 3 are installed inside the air supply passage 9 as shown in FIG. 2, and the relative humidity (hereinafter abbreviated as humidity) of the air supply D (arrow D) is measured by the humidity sensor 2; The temperature of the supply air D is measured by the temperature sensor 3. A control unit 30 is provided to drive each of the above devices. A remote controller 40 for operating the heat exchange ventilator 50 is connected to the control unit 30. The control unit 30 communicates with the remote controller 40. The control unit 30 incorporates a CPU and non-volatile memory (not shown) inside, and operates the air supply blower 11 and the exhaust blower 10 based on a stored control program determined in advance according to a signal input from the remote control 40. Let

FIG. 3 is a block diagram of the control unit 30. The control unit 30 receives the humidity detection signal of the supply air D detected by the humidity sensor 2 and the temperature detection signal of the supply air D detected by the temperature sensor 3, and stores a predetermined humidity threshold and Mist intrusion determination means 30a for determining whether or not fog has occurred in the supply air D by comparing with a predetermined temperature threshold value, and stopping to stop the supply air blower 11 and the exhaust blower 10 when it is determined that fog has occurred The stop time Tn, which is the time length (time length) of the period, is adjusted with reference to a predetermined stop time Tn table (FIG. 6) stored in advance in the control unit 30 and provided in the control unit 30. The stop period adjusting means 30b for reading and writing the stage number n as data related to the stop time Tn, which is the length of the stop period for stopping the supply air blower 11 and the exhaust blower 10, between the storage means 30c, And a control unit 30d for controlling the operation of the supply air blower 11 and the exhaust fan 10 on the basis of the stop period of the stop period adjustment means 30b.

Here, the determination of the presence or absence of fog in the mist intrusion determination means 30a will be described. The determination of the mist intrusion determination means 30a is performed inside the heat exchange ventilator 50 when the supply air D is taken into the heat exchange ventilator 50. In particular, since the purpose is to stop the intake of air in a state where moisture is expected to be stored in the heat exchanger 12 due to aggregation or condensation, fog is generated in outdoor air such as outside air taken in as the supply air D. If it is rainwater and water droplets are mixed in the supply air D, or if there is no mist but there is high humidity where condensation may occur in the heat exchanger 50 and condensation may occur In the present invention, including the case of high humidity where no mist is present and no mist is present, it means a broader range than the literal meaning of mist generation.

4 and 5 are flowcharts showing the control procedure of the control unit, FIG. 4 is the first half of the flowchart, and FIG. 5 is the second half of the flowchart. FIG. 6 is a table of stop time values Tn in intermittent operation control. FIG. 7 is an explanatory diagram showing the integration time below the second humidity threshold and the transition of the stage in the intermittent operation control mode. Detailed operation of the heat exchange ventilator 50 will be described with reference to FIGS. 4, 5, and 6. When the power SW (not shown) of the remote controller 40 is turned on, a signal is transmitted to the control unit 30 of the heat exchanging ventilator 50, and air supply is performed based on the air volume setting set by the remote controller 40 by the control unit 30. The operation of the blower 11 and the exhaust blower 10 is started and starts. When started, the process proceeds to step 1 (S1), and the supply air D, which is outdoor air, passes near the humidity sensor 2 and the temperature sensor 3, and the humidity sensor 2 and the temperature sensor 3 set the humidity and temperature of the supply air D, respectively. To detect. Although not shown in the flowchart, humidity detection is continued in S1 for 4 minutes in order to improve humidity detection accuracy.

Then, after 4 minutes, the process proceeds to step 2 (S2). In S2, whether or not the humidity detected in S1 is equal to or higher than a predetermined first humidity threshold and the temperature is equal to or higher than 0 ° C. as a criterion for determining the presence or absence of fog. Determine if the condition is met. In the present embodiment, the first humidity threshold is 90% RH. The reason for setting 90% RH instead of 100% RH is that the detection accuracy of the humidity sensor 2 is generally poor, so that the detection accuracy is taken into consideration, and it is determined that no fog is generated even though fog is actually generated. In order to prevent misjudgment and make a judgment on the safety side, or in the case of high-humidity air that does not contain mist, condensation may occur in the heat exchange ventilator 50 due to condensation. is there. If the determination condition is not satisfied in S3, it is determined that “no fog is generated” and the process proceeds to step 3 (S3). If the determination condition is satisfied, it is determined that “fog is generated” and the operation is intermittently started from the normal operation control mode. It shifts to the operation control mode and proceeds to step 4 (S4).

In S3, the air supply blower 11 and the exhaust blower 10 are continuously operated (normal operation), and the process returns to S1. Therefore, if the humidity of the supply air D remains below the first humidity threshold, the control flow circulates through S1 to S3, and the operation of the supply air fan 11 and the exhaust air fan 10 is continued and the continuous operation is performed. (Continuous operation control mode).

The intermittent operation control mode is entered from S4, which is determined as “fog generation is present” in S3. In S4, the control unit 30 is informed about the stage number n (data related to the stop period) corresponding to each stage in which the stop time Tn of the air supply blower 11 and the exhaust blower 10 in the intermittent operation in the intermittent operation control is changed stepwise. The n value of the stage number n already stored in the provided storage means 30c is read, and the value obtained by adding 1 to the read n value is overwritten and saved in the storage means 30c as a new n value, and updated. Go to step 5 (S5). Although the stage number n is not shown in the flowchart, the n value is stored as it is even if the power SW (not shown) of the remote controller 40 is turned off in each step. When the main power supply (not shown) for supplying power to 50 is turned off, the stored n value is erased and reset. Therefore, when the main power supply (not shown) is turned on thereafter, n = 0. Accordingly, n = 0 at the start when power is supplied to the heat exchange ventilator 50 for the first time after the heat exchange ventilator 50 is installed. In this embodiment, there are four stages of intermittent operation, and the stage number n has an upper limit of 4 in accordance with the number of stages. Therefore, if the stored value is 4, n + 1 remains 4 as well. Become. Note that the number of stages may be arbitrarily reduced or increased without being bound by the present embodiment.

In S5, the stop time (Tn) in which the relationship between the stage number n and the stop time Tn in the intermittent operation control stored in advance in the control unit 30 is determined according to the stage number n value stored in the storage unit 30c in S4. The stop time Tn is determined based on the table (FIG. 6), and the process proceeds to Step 6 (S6).

In S6, a stop period for stopping the operation of the air supply blower 11 and the exhaust air blower 10 is started, the operation of the air supply blower 11 and the exhaust air blower 10 is stopped, and the process proceeds to Step 7 (S7). In S7, the time elapsed since the start of stopping the supply air blower 11 and the exhaust blower 10 in S6 is compared with the stop time Tn determined in S5, and the supply blower 11 and the exhaust blower 10 are stopped. If the elapsed time exceeds the stop time Tn, the process proceeds to step 8 (S8).

In S8, the stop period is ended, and a detection period for detecting the latest outdoor air state is started by restarting the operation of the air supply blower 11 and the exhaust blower 10, and the process proceeds to step 9 (S9). . In S9, the humidity and temperature of the supply air D are detected by the humidity sensor 2 and the temperature sensor 3, respectively, and the process proceeds to Step 10 (S10). In S10, the time elapsed since the operation of the air supply blower 11 and the exhaust blower 10 in S8 is compared with a predetermined detection time Ts stored in advance in the control unit 30, and the air supply blower 11 and the exhaust blower are compared. If the elapsed time from the start of the operation 10 becomes equal to or longer than the detection time Ts, the process proceeds to step 11. In this embodiment, the detection time Ts is set to 4 minutes. The reason is that the humidity detection response of the humidity sensor 2 with respect to the humidity change is poor, so that the humidity detection accuracy is improved by measuring until the humidity change can be sufficiently responded. Therefore, it may be arbitrarily set according to the humidity detection accuracy. However, in order to prevent unnecessary mist from being taken into the heat exchange ventilator 50 as much as possible, it is preferable that the humidity be as short as possible within a range where the humidity can be detected accurately. Further, in consideration of the humidity detection responsiveness of the humidity sensor 2, the humidity detection value during the Ts time may be ignored and the humidity detection value at the end of the Ts time may be used as the humidity value.

In S11, in order to determine again the presence or absence of fog due to the humidity and temperature of the supply air D detected in S9, it is determined whether the detected humidity is equal to or higher than a predetermined first humidity threshold and the temperature is equal to or higher than 0 ° C. Determine if the condition is met. If the determination condition is not satisfied, such as when the humidity of the supply air D is less than the first humidity threshold value, it is determined that “no mist has occurred” (no mist has been generated) and the process proceeds to step 12 (S12). When the determination condition is satisfied, it is determined that “fog has been generated” (fog has been continuously generated), and the process returns to S4. In both cases, the detection period ends.

In S12, the detection period ends, but the operation of the air supply blower 11 and the exhaust blower 10 is continued as it is, and the process proceeds to Step 13 (S13). In S13, the humidity and temperature of the supply air D are detected again by the humidity sensor 2 and the temperature sensor 3, and the process proceeds to step 14 (S14).

In S14, the humidity detected in S13 is equal to or higher than a predetermined first humidity threshold value stored in advance in the control unit 30 in order to determine again the presence or absence of fog due to the humidity and temperature of the supply air D detected in S13. And whether or not the condition for determining whether the temperature is 0 ° C. or higher is satisfied. If the determination condition is not satisfied, such as when the humidity of the supply air D is less than the first humidity threshold value, it is determined that “no mist has occurred” (the state in which the mist has disappeared continues), and the process proceeds to step 15 (S15). If the determination condition is satisfied, it is determined that “fog has occurred” (fog has occurred again), and the process returns to S4.

In S15, in order to determine whether or not the supply air D is a condition for drying the supply air passage 9 and the heat exchanger 12, the humidity of the supply air D detected in S13 is stored in advance in the control unit 30 as an indication of drying. It is determined whether or not a condition for determining whether the temperature is equal to or lower than a predetermined second humidity threshold and whether the temperature is 0 ° C. or higher is satisfied. In the present embodiment, 85% RH, which is lower than the first humidity threshold, is set as the second humidity threshold. The reason why the difference is provided by making the second humidity threshold lower than the first humidity threshold is that the supply air D does not include the vicinity of the boundary of whether or not fog is generated, and more reliably includes no fog. However, it is for judging whether it is in a state where a drying effect can be obtained by blowing air. If the humidity detected in S13 is equal to or lower than the second humidity threshold, the determination condition is satisfied and the process proceeds to step 16 (S16). If the humidity exceeds the second humidity threshold, the process returns to S13.

  In S16, a timer (not shown) provided in the control unit 30 is reset. In Step 17 (S17), the timer (not shown) reset in S16 is started, and the process proceeds to Step 18 (S18).

In S18, the humidity sensor 2 and the temperature sensor 3 again detect the humidity and temperature of the supply air D, respectively, and the process proceeds to step 19 (S19). In S19, it is determined again whether the supply air D satisfies the determination condition for drying the supply passage 9 and the heat exchanger 12. If the humidity detected in S18 satisfies the determination condition (the state where the drying condition is satisfied continues), the process proceeds to step 20 (S20). If the humidity does not satisfy the determination condition, it is determined that the drying condition is not satisfied, and the process proceeds to S23.

  In S20, a timer (not shown) started in S17 determines whether a predetermined drying time Td stored in advance in the control unit 30 has elapsed. If the elapsed time of a timer (not shown) is equal to or greater than the drying time Td, the process proceeds to step 21. If the elapsed time is less than the drying time Td, the process returns to S18. In the present embodiment, the drying time Td is the amount of water that can be retained in the heat exchanger 12 without being leaked outside the heat exchanger 12 when air having a humidity of 85% RH is passed through the heat exchanger 12. Is set to a time during which the amount of water (1/4 of the limit water amount of the heat exchanger 12) divided by the number of stages of intermittent operation control (four in this embodiment) can be dried. Then, experimentally obtained, Td = 150 minutes.

  In S21, the stage number stored in the storage means 30c is read, and a value obtained by subtracting 1 from the stage number n value is overwritten and saved in the storage means 30c as a new stage number n value, and updated. Go to).

  In S22, it is determined whether or not the value of the stage number n is 0. If the value of the stage number n is not 0, the process returns to S13. When the value of the stage number n is 0, the process leaves the intermittent operation control mode, shifts to the normal operation control mode, and returns to S1.

  In S23, the timer started in S17 is stopped, and in step 24 (S24), it is determined whether the determination condition whether the humidity detected in S18 is larger than the second humidity threshold and smaller than the first humidity threshold is satisfied. . If the determination condition is not satisfied, the humidity is equal to or higher than the first humidity threshold value, and the process returns to S4. If the determination condition is satisfied in S24, the air condition is “no mist generation” but has little effect of drying the heat exchanger 12 or the air supply passage 9, and the process proceeds to step 25 (S25).

  In S25, the humidity sensor 2 and the temperature sensor 3 again detect the humidity and temperature of the supply air D, respectively, and the process proceeds to step 26 (S26). In S26, it is determined whether or not the same determination condition for the occurrence of fog as in S14 is satisfied. If the determination condition is satisfied, it is determined again that “fog has occurred” and the process returns to S4, and the determination condition is not satisfied. Advances to step 27 (S27).

  In S27, it is determined whether or not the same drying conditions as in S15 are satisfied. If the humidity of the intake air D is equal to or lower than the second humidity threshold, it is determined that the drying conditions are satisfied, and the process proceeds to step 28 (S28). If the determination condition is not satisfied in S27, the process returns to S24. In S28, the stopped timer is restarted, and the process proceeds to S20.

If the humidity detection accuracy of the humidity sensor 2 is good, the second humidity threshold value shown in S15, S19 and S27 of this embodiment is not used, and the judgment conditions in S15, S19 and S27 are less than the first humidity threshold value. The determination condition may be that the temperature is 0 ° C. or higher.

  Next, the operation of the control unit 30 will be described with a specific example. A case where a changeover switch 35 described later is for a general area will be described. Since the power supply SW (not shown) in the remote controller 40 is turned on, the humidity of the supply air D detected by the humidity sensor 2 is not less than 90% RH, which is the first humidity threshold, and has been detected by the temperature sensor 3. When the temperature of the intake air D is equal to or higher than 0 ° C., it is determined that “fog has been generated” and the process shifts to the intermittent operation control mode. In the intermittent operation control in the intermittent operation control mode (intermittent operation in S4 to S11), four stages with different stop periods are prepared step by step, and each stage operates the air supply fan 11 and the exhaust fan 10. After the stop period is stopped, the operation of the air supply blower 11 and the exhaust blower 10 is restarted and operated for 4 minutes (Ts) to detect the latest state of the air supply D taken from the outside It consists of a detection period. Also, before entering each stage, the stage number n stored in the storage means 30c is read, and n + 1 obtained by adding 1 to the n value is overwritten and updated in the storage means 30c as a new stage number. Since n = 0 is stored at the beginning of the transition to the intermittent operation control mode, the new stage number is n = 0 + 1 = 1, and the transition to the first (1st) stage is performed. The exhaust blower 10 is stopped for one hour, which is a stop time (Tn) corresponding to the stage number n in FIG. 6, and the air supply blower 11 and the exhaust blower 10 are operated during the subsequent detection period of 4 minutes. When the state of D is detected and the humidity is 90% RH or higher and the temperature is 0 ° C. or higher again during the detection period, it is determined that “fog has occurred” and the first (1st ) The stage ends, and 1 is added to the stage number n, so that n = 2 and the process proceeds to the second (2nd) stage.

In the second (2nd) stage, the supply blower 11 and the exhaust blower 10 are stopped for two hours as a stop period, and then the humidity is 90% RH or more which is the first humidity threshold in the detection period, and the temperature is 0 ° C. or more. Is detected again, the second (2nd) stage is determined as “fog is present”, 1 is added to the stage number n, n = 3, and the process proceeds to the third (3rd) stage.

In the third (3rd) stage, after the supply blower 11 and the exhaust blower 10 are stopped for 3 hours as a stop period, the humidity is 90% RH or more which is the first humidity threshold in the detection period, and the temperature is 0 ° C. or more. Is detected again, the third (3rd) stage is determined to be “fog has occurred”, 1 is added to the stage number n, n = 4, and the process proceeds to the force (4th) stage.

In the force (4th) stage, after the supply blower 11 and the exhaust blower 10 are stopped for 4 hours as a stop period, the humidity is 90% RH or more which is the first humidity threshold in the detection period, and the temperature is 0 ° C. or more. Is detected again, the force (4th) stage is temporarily terminated by determining that “fog has occurred”. However, since the force (4th) stage is set to the highest stage, the stage number n also has an upper limit of n = 4. Therefore, n = 4 is maintained and the force (4th) stage is performed once again. Therefore, if the detection at a humidity of 90% RH or higher, which is the first humidity threshold value, and a temperature of 0 ° C. or higher continues in the detection period, the force (4th) stage is repeated.

In any stage, if the supply air D does not exceed the first humidity threshold value of 90% RH during the detection period, it is determined that “fog is not generated”, and the supply air blower 11 remains as it is after the detection period. The operation of the exhaust fan 10 is continued. Then, as shown in FIG. 7, the supply air D is 85% RH or less, which is the second humidity threshold, and the temperature is 0 ° C. in a continuously operated state (the humidity remains below the first humidity threshold). When the accumulated time in the above state is 150 minutes (Td) or more, which is an indication of the drying time, n-1 obtained by subtracting 1 from the stage number n stored in the storage means 30c is set as a new stage number. As a result, the storage means 30c is overwritten and updated, and the operation of the air supply blower 11 and the exhaust blower 10 is continued. From this state, if supply air D again exceeds 90% RH, which is the first humidity threshold, it is determined that “fog has occurred”, and n + 1 value obtained by adding 1 to the stage number stored in storage means 30c. Is updated as a new stage number n, overwritten and stored in the storage means 30c, and intermittent operation control is performed at the stage corresponding to the new stage number n.

Furthermore, if the integration time in the state where the supply air D is 85% RH or less which is the second humidity threshold value and the temperature is 0 ° C. or more is repeated for 150 minutes (Td) or more, the value of the stage number n is gradually decreased. Thus, if the stage number n becomes n = 0, the operation is continued from the intermittent operation control mode while the operation of the air supply blower 11 and the exhaust blower 10 is continued, and the normal operation control mode is returned to the normal operation.

  Next, the function of switching the default value of the stop time Tn according to the area where the heat exchange ventilator 50 is used will be described. As shown in FIG. 2, the control unit 30 is provided with a selector switch 35 that is a switching unit that switches the value of the stop time Tn at each stage in the intermittent operation control. As shown in FIG. 6, when the changeover switch 35 is set for a general area, the stop time Tn is 1 hour (1st stage), 2 hours (2nd stage), 3 hours (3rd stage), 4 hours (4th stage) ) And the changeover switch 35 is set for foggy areas, the stop time Tn is 1 hour (1st stage), 4 hours (2nd stage), 9 hours (3rd stage), 16 hours (4th stage) Set to Therefore, when the heat exchange device 50 is installed, the changeover switch 35 is switched and used according to the area where the heat exchange device 50 is installed.

  In the present embodiment, both the supply air blower 11 and the exhaust air blower 10 are operated during the detection period. However, the air supply air blower 11 only needs to be able to detect the air state of the intake air D with the humidity sensor 2 and the temperature sensor 3. You may only drive.

  Further, in the present embodiment, the example of four stages of the intermittent operation control stages 1 to 4 is shown, but the number of stages is not limited to four stages. Also, the number of stage stages may be different for the general area and the foggy area.

  Further, in the present embodiment, the degree of drying of the heat exchanger 12 is determined based on whether or not the integration of the elapsed time in the state equal to or lower than the second threshold lower than the first humidity threshold is equal to or longer than the drying period Td. The lower the humidity of the air flowing through the exchanger 12 is, the faster the time for drying the heat exchanger 12 is. Therefore, a third humidity threshold value lower than the second humidity threshold value is provided, and the drying period Td ′ shorter than the drying time Td. You may judge the degree of dryness.

  In the present embodiment, whether the humidity detected by the humidity sensor 2 is equal to or higher than a predetermined first humidity threshold and whether the temperature is 0 ° C. or higher is satisfied as a determination condition for the presence or absence of fog. Judging. The reason why the temperature is 0 ° C. or higher is added to the judgment condition. If the temperature is 0 ° C. or lower, the relative humidity is high and the absolute humidity is low. This is because the amount of water accumulated in the ventilator 50 is small, so that water can be sufficiently retained in the heat exchange ventilator 50 and unnecessary ventilation stop (intermittent operation) is not performed. However, in the case of the heat exchange ventilator 50 where the amount of water that can be held by the heat exchange ventilator 50 is small, the humidity detected by the humidity sensor 2 as a determination condition for the presence or absence of mist infiltration is not less than a predetermined first humidity threshold, It is good to perform intermittent operation also on air below 0 ° C.

  In addition, when there is a failure mode that outputs high humidity when the humidity sensor fails, it is necessary to provide an emergency stop function. For example, since it is known that the humidity sensor 2 of the present embodiment outputs a humidity value of 99% RH or more at the time of failure, it is not shown in the flowcharts of FIGS. 4 and 5, but S2, S11, S14, In the humidity determination step in S15, S24, S26, and S27, when the humidity by the humidity sensor 2 is 99% RH or more, the flow from S4 to S11 is repeated thereafter (intermittent operation). If the humidity by the humidity sensor 2 is 99% RH or more for three consecutive times, it cannot be determined whether the humidity sensor 2 is malfunctioning or normal, so the air supply fan 11 and the exhaust fan 10 are operated. An emergency stop is performed, and a display device (not shown) such as an LED provided in the control unit 30 or a display unit of the remote controller 40 is displayed to notify the user that an abnormality has occurred. Instead of making an emergency stop at a continuous number of times when the humidity by the humidity sensor 2 is 99% RH or higher, a timer is started when the humidity is 99% RH or higher, and then a predetermined time ( For example, in the repetition of the flow from S4 to S11 performed at 100 minutes), when the humidity by the humidity sensor 2 in S11 continuously detects 99% RH or more, the emergency stop is made and the user is notified. It may be.

According to the above configuration, when the humidity of the supply air (supply air D) taken in from the outdoor is detected and the “mist generation” is detected by the mist intrusion determination means, the supply fan and the exhaust fan Intermittent operation (in the stop period and the detection period), which is composed of a stop period for stopping the air and a detection period for operating the air supply blower having a shorter duration than the stop period in order to detect the humidity of the outdoor air after the stop period. The system is equipped with a stop period adjustment means that adjusts the length of time (time length) of the stop period in intermittent operation, so depending on the length of fog generation time outdoors (usually outdoors) It is possible to adjust the length of the stop period by changing the stop time Tn in the intermittent operation control, and limit the ventilation operation due to the outdoor humidity condition (the state of the supply air D) (particularly when taking in fog or high humidity air) (Ventilation stop) as little as possible Comb, is maintained as much as possible ventilation, it is possible to the indoor environment comfortable state. In addition, when “the occurrence of fog” is detected, the air supply blower and the exhaust air blower are stopped, so that moisture such as mist is taken in along with the supply of the supply air D to the supply passage and the heat exchanger. Water that has condensed or that has taken in high-humidity air and condensed in the air supply passage or heat exchanger causes water that has dropped beyond the water retention limit of the heat exchanger or water that has condensed in the air supply passage. Can be prevented from flowing out of the heat exchange ventilator as much as possible. In addition to the fog, if the other end opening (outdoor air intake port) of the duct (not shown) connected to the outdoor suction port of the heat exchange ventilator is installed without providing a waterproof cover The same effect can be obtained even when rainwater enters the air taken in due to bad weather.

In addition, when the mist intrusion determining means detects “the occurrence of mist” during the intermittent operation detection period, the stop period adjusting means performs the intermittent operation with the stop period longer than the previous time again, and the stage is Since the stop time is lengthened each time it goes from 1 to 4, the restriction of ventilation operation due to outdoor humidity conditions (especially when the intake of mist or high humidity air is taken in) is reduced as much as possible to maintain ventilation as much as possible. It becomes possible to make the environment comfortable. Explaining in detail, in order to detect the latest outdoor air condition (supply air D state) in intermittent operation control, the air supply fan is operated for a minimum time, and the outdoor air is taken in and detected by the humidity sensor. (It is a detection period, which is 4 minutes in this embodiment), but if the taken-in outdoor air (supply air D) contains mist or high humidity, it is taken into the detection period. Fog is condensed in the heat exchanger or high-humidity air is condensed and water is retained in the heat exchanger, and the fog is generated or high humidity continues. If the outdoor air (supply air D) is continuously taken in, the heat exchanger approaches the limit water amount (water retention limit) that can retain water without drying. Therefore, the number of detection periods until reaching the limit amount of water that can be retained in the heat exchanger is finite unless the heat exchanger is dried on the way. In general, it is considered that the generation frequency of fog is decreased as the continuous generation time becomes longer, that is, the generation frequency of short-time fog is high, but the generation frequency of long-time fog is low. The same applies to high humidity. Although the occurrence frequency of high humidity for a short time is high, the occurrence frequency of high humidity for a long time is low.

Therefore, in the present invention, the stop period is lengthened as the stage progresses. Therefore, in the case of a short mist that frequently occurs or in a short period of high humidity, the stop period time is short in intermittent operation control and the stop is stopped. After the period is over, check again for the presence or absence of fog, and if there is no fog (even if it is not high humidity), ventilation can be resumed. it can. In addition, even in the case of long-time fog or high humidity with low occurrence frequency, the generation time of fog or high humidity that can be handled by the number of detection periods possible until the heat exchanger reaches the water retention limit can be prolonged. It is possible to prevent the water retention limit from being exceeded as much as possible even with generation of fog or high humidity for a long time.

In addition, storage means for storing a stage number corresponding to the length of time of the stop period (data corresponding to the length of time of the stop period) is provided. ”Is detected, the stop period adjustment means reads the stage number stored in the storage means, adds 1 to the value of the read stage number n, and from the time length corresponding to the read stage number n Further, the value of the new stage number n + 1 corresponding to the longer time length is updated and stored in the storage means, and the time length of the stop period is updated and stored in the storage means, corresponding to the stored stage number (new stage number n + 1). Since the intermittent operation with the length of time to be performed is performed again, the time length of the next stop period can be adjusted longer in consideration of the time length of the previous stop period. It is possible to increase the time length of the stages and gradually stop period As the (increased stage number).

In addition, during the intermittent operation detection period, if the mist intrusion determination means does not detect “the occurrence of fog”, the air supply fan and the exhaust fan are continuously operated, and then continuously for a predetermined time. When the mist intrusion determining means does not detect “the occurrence of fog”, the stop period adjusting means reads the stage number stored in the storage means, and calculates 1 from the value of the read stage number n. The value of the new stage number n-1 corresponding to the time length shorter than the time length corresponding to the read stage number n is updated and stored in the storage means, so that the outdoor air (mist) D) For a heat exchanger in which mist, high humidity, etc. are retained by aggregation / condensation with the intake of D), air containing no mist or high humidity is then continued for a predetermined time (drying period Td). By flowing The number of detection periods up to the water retention limit of the heat exchanger can be increased by the amount that the water retained in the exchanger has evaporated, the heat exchanger has dried, and the amount of water retained has decreased. Only when the intermittent operation is performed next, the length of the stop period can be shortened. Therefore, in response to changes in the outdoor humidity condition (supply air D state) over time, the ventilation operation is restricted by the outdoor humidity condition (supply air D state) (especially ventilation during intake of fog or high-humidity air) It is possible to maintain the ventilation environment as much as possible and make the indoor environment comfortable. In the present embodiment, one drying period Td corresponds to one detection period. Further, the time of the new stop period can be adjusted to be short in consideration of the stored stop period time, and the stop time can be shortened step by step as the stage is lowered (stage number is decreased). .

Furthermore, when the accumulated time (time elapsed time of the timer) of the state below the first humidity threshold and below the second humidity threshold is less than the first humidity threshold is equal to or longer than a predetermined time (drying period Td), If the stop period adjustment means stores in the storage unit the stage number corresponding to the stop period shorter than the stop period stored in the storage means, the stop period adjustment means does not include the air condition near the boundary whether or not there is fog. Since it is possible to reliably measure the time during which air that does not contain mist is blown, the drying condition of the heat exchanger can be accurately determined. Further, if the difference between the first humidity threshold and the second humidity threshold is increased, the degree of drying can be determined even if the humidity detection accuracy is not good by the humidity sensor.

In addition, during the intermittent operation detection period, when the mist intrusion determining means does not detect “the occurrence of mist”, the air supply blower and the exhaust fan are continuously operated, and then the mist intrusion determining means When “the occurrence of fog” is detected, the stop period adjustment means reads the stage number stored in the storage means, adds 1 to the value of the read stage number n, and reads the read stage number n The value of the new stage number n + 1 corresponding to a longer time length than the time length corresponding to is updated and stored in the storage means, and the time number of the stop period is updated and stored in the storage means (new Since the intermittent operation with the time length corresponding to the stage number n + 1) is performed again, the outdoor humidity condition (supply air D) corresponding to the change with time of the outdoor humidity condition (state of supply air D). Limits of ventilation operation by state) (especially ventilation stopped during incorporation of air fog and high humidity) minimize, is maintained as much as possible ventilation, it is possible to the indoor environment comfortable state.

  In addition, since the control unit is provided with switching means for switching the adjustment of the duration of the stop time Tn of each stage in intermittent operation, the area where the heat exchange device is installed or after installation is By changing the changeover switch according to the region or the general region, the adjustment of the length of the stop time Tn can be changed. Fog generation conditions vary greatly from region to region, and some regions do not generate much fog, while other regions generate frequent fog. In general, fog generation tends to take a long time in regions where fog occurs frequently. Therefore, by setting the general area mode in areas where mist does not occur frequently by the switching means, and setting in the fog area area mode in which the length of stop time is longer than in the general area mode in areas where fog is frequent, the ventilation operation is restricted ( (In particular, the suspension of ventilation when taking in mist and high humidity air) will be reduced as much as possible, the ventilation will be maintained as much as possible, the indoor environment will be comfortable, and the water retention limit of the heat exchanger will be exceeded. Can be reduced as much as possible.

In addition, as an example of Kirita frequent occurrence area, for example, based on the meteorological statistics data of the Japan Meteorological Agency, Hachinohe of Hokkaido Wakkanai, Kitamieda, Kushiro, Yutake, Monbetsu, Abashiri, Kotobuki, Esashi, Tomakomai, Muroran, Urakawa, Obihiro, Nemuro, Aomori Prefecture Miyako, Iwate Prefecture, Ishinomaki, Miyagi Prefecture, Onahama, Fukushima Prefecture, Okunikko, Tochigi Prefecture, Isogo, Chiba Prefecture, Tateyama, Irozaki, Shizuoka Prefecture, Omaezaki, Karuizawa, Nagano Prefecture, Cape Muroto, Nagasaki Prefecture These include areas such as Hirado in the prefecture, Mt. Unzen, Mt. Aso in Kumamoto Prefecture, and generally in the vicinity of mountainous areas, lakes, rivers, and coasts.

DESCRIPTION OF SYMBOLS 1 Main body box 2 Humidity sensor 3 Temperature sensor 4 Indoor side inlet port 5 Outdoor side inlet port 6 Indoor side outlet 7 Outdoor side outlet 8 Exhaust passage (exhaust air path)
9 Air supply passage (supply air passage)
DESCRIPTION OF SYMBOLS 10 Exhaust air blower 11 Supply air blower 12 Heat exchanger 30 Control part 30a Fog intrusion determination means 30b Stop period adjustment means 30c Storage means 30d Control means 35 Changeover switch (switching means)
50 Heat exchange ventilator n Stage number Tn Stop time Ts Detection time Td Drying time

Claims (8)

The main body box incorporates an air supply fan, an exhaust air fan, and a heat exchanger. The air supply fan sucks outdoor air from the outdoor suction port, and supplies the indoor air from the indoor outlet through the heat exchanger. In the heat exchange ventilator in which an air supply air passage to be ventilated and an exhaust air passage for sucking room air from the indoor side suction port through the heat exchanger and exhausting the air from the outdoor side outlet through the heat exchanger are formed.
A humidity sensor disposed in the supply air path to detect the humidity of outdoor air;
Mist intrusion determining means for determining the presence or absence of mist based on the detected humidity of the humidity sensor;
From the stop period for detecting the humidity of outdoor air after the stop period and the stop period for stopping the air supply blower and the exhaust blower performed when the fog intrusion determining unit detects the occurrence of fog A heat exchanging ventilator comprising: a stop period adjusting unit that adjusts a time length of the stop period of the intermittent operation configured by a detection period in which the air supply blower is operated for a short time length. In the detection period, when the fog intrusion determining unit detects the occurrence of fog, the stop period adjusting unit performs the intermittent operation again with the time length of the stop period being longer than the previous time. Item 2. The heat exchange ventilator according to Item 1. Storage means for storing data corresponding to the length of the stop period;
In the detection period, when the fog intrusion determination unit detects the occurrence of fog, the stop period adjustment unit reads the data stored in the storage unit and corresponds to the read data. New data corresponding to a longer time length than the time length is updated and stored in the storage means, and the intermittent operation with the time length of the stop period set to the time length corresponding to the new data is performed again. The heat exchange ventilator according to claim 2, wherein In the detection period, when the mist intrusion determination means does not detect the generation of mist, while continuously operating the air supply blower and the exhaust air blower,
After that, when the mist intrusion determining means does not detect the occurrence of mist continuously for a predetermined time, the stop period adjusting means reads the data stored in the storage means, and reads the read The heat exchange ventilator according to claim 3, wherein new data corresponding to a time length shorter than a time length corresponding to the data is updated and stored in the storage means. In the detection period, when the mist intrusion determination means does not detect the generation of mist, while continuously operating the air supply blower and the exhaust blower,
Thereafter, when the mist intrusion determining means detects the occurrence of fog, the stop period adjusting means reads the data stored in the storage means, and is longer than the time length corresponding to the read data. The new data corresponding to the time length is updated and stored in the storage means, and the intermittent operation is performed again with the time length of the stop period set to the time length corresponding to the new data. 3. The heat exchange ventilator according to 3. When the humidity of the outdoor air detected by the humidity sensor exceeds a predetermined first threshold, the mist intrusion determination means determines that the generation of mist has been detected, and if it is equal to or less than the first threshold The heat exchange ventilator according to any one of claims 1 to 5, wherein it is determined that the generation of fog is not detected. In the detection period, when the humidity of the outdoor air detected by the humidity sensor is less than the first threshold value, the mist intrusion determination means determines that the generation of mist is not detected, and the air supply blower and the air supply While continuously operating the exhaust fan,
Thereafter, the humidity of the outdoor air detected by the humidity sensor continues below the first threshold, and the accumulated time in a state equal to or lower than a predetermined second humidity threshold lower than the first threshold is equal to or longer than a predetermined time. In this case, the stop period adjustment unit reads the data stored in the storage unit, and updates the storage unit with new data corresponding to a time length shorter than the time length corresponding to the read data. The heat exchange ventilator according to claim 4, wherein the heat exchange ventilator is stored. The heat exchange ventilator according to any one of claims 1 to 7, further comprising a switching unit that switches an adjustment degree of the stop period.

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