JP2007322078A - Heat exchange ventilator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchange ventilator capable of expanding the lower limit of a usable temperature of a heat exchanger by using accurate temperature information concerning the outside air as control information to carry out control operation. <P>SOLUTION: In the heat exchange ventilator carrying out heat exchange through a heat exchanger 1 between supply and exhaust air flows, a temperature sensor 6 outputting temperature information to a control circuit 12 is provided in a supply air passage 3 of an inlet side portion of a secondary passage of the heat exchanger 1, and operation is controlled by the control circuit 12. In the control circuit 12, the temperature information of the temperature sensor 6 is not fetched during stoppage of a supply air blower 5 forming the supply air flow, and until a time until a temperature of a detection target space provided with the temperature sensor 6 is stabilized, a response time of the temperature sensor 6, and a time responding to an operation stabilization time of an air-blowing related apparatus relevant to air supply have passed from an operation start of the supply air blower 5, the temperature information of the temperature sensor 6 is not used as the control information. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchange ventilator that performs supply and exhaust at the same time, and performs continuous heat exchange between supply and exhaust flows.

  For heat exchange ventilators that supply and exhaust air at the same time and perform continuous heat exchange between the air supply and exhaust streams, the air supply temperature is raised to prevent condensation and frost formation on the heat exchanger in winter Some have a heater (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 60-182629

  In the conventional air-conditioning ventilation fan described above, when a temperature sensor provided between the air supply fan and the heat exchanger detects a temperature below a certain temperature, the control circuit is interposed between the air supply port and the air supply fan. The provided heater is operated so as to warm the outside air to prevent the heat exchanger from condensing. However, when the air supply blower is stopped, the atmosphere in which the temperature sensor is installed is closer to the indoor atmosphere than the actual outside air atmosphere, so the temperature information of the temperature sensor obtained along with the operation of the air supply blower is It is not accurate outside air temperature information. Therefore, even at an outside temperature at which condensation or frost may actually occur, the heater does not operate and causes condensation or frost. On the other hand, there is no risk of condensation or frost on the outside air temperature. If the atmosphere in which the temperature sensor is placed may cause condensation or frost for some reason, the heater operates and wastes power. Will end up. Therefore, the current situation is that the output value of the temperature sensor is set slightly higher.

  The present invention has been made to solve the above-described problems, and the problem is that the accurate temperature information about the outside air is controlled as control information, and the heat exchanger can be used. It is to obtain a heat exchange ventilator that can expand the lower limit of the temperature, and to obtain a heat exchange ventilator that does not consume useless power.

  In order to solve the above-described problems, the present invention provides an exhaust passage and an air supply passage, part of which is composed of a primary passage and a secondary passage of a heat exchanger, and the exhaust passage has an exhaust flow from the room to the outside. The air supply passage incorporates a blower that forms a supply air flow from the outside to the room, and the air supply passage in the inlet side portion of the secondary passage of the heat exchanger has temperature information sent to the control means. The heat exchanging ventilator is provided with a temperature sensor that outputs the air temperature and the operation is controlled by the control means. The control means does not take in the temperature information of the temperature sensor while the blower that forms the supply airflow is stopped. After the start of the operation, the time until the temperature of the detection target space provided with the temperature sensor stabilizes, the response time of the temperature sensor, and the time corresponding to the operation stabilization time of the blower-related equipment related to supply air Until the temperature Employing means to avoid using the temperature information of the service as control information.

  According to the present invention, the temperature information of the temperature sensor is used as the control information after the air stagnated in the detection target space where the temperature sensor is placed is swept away and becomes an actual outside air atmosphere. Therefore, it is possible to perform an accurate control operation. And the lower limit of the temperature which can use a heat exchanger can be extended, and the heat exchange ventilation apparatus which does not consume useless electric power is obtained.

  The heat exchanging ventilator according to the present invention includes an exhaust passage and an air supply passage which are partially independent of each other, and are constituted by a primary passage and a secondary passage of the heat exchanger. The exhaust passage incorporates an exhaust blower that forms an exhaust flow from the room to the outside. A supply air blower for forming a supply air flow from the outside to the room is incorporated in the supply passage. A temperature sensor such as a thermistor is provided in the air supply passage at the inlet side portion of the secondary passage of the heat exchanger. In addition, a heater is provided in the vicinity of the outdoor suction port of the air supply duct in the air supply passage to raise the temperature of the air supply flowing through the air supply duct. A normally closed electric shutter that opens and closes the air supply duct is provided upstream of the heater of the air supply duct, and a normally closed electric shutter that opens and closes the exhaust duct is provided in the vicinity of the outdoor outlet of the exhaust duct. . The air supply blower, the exhaust blower, the heater, and each electric shutter are controlled by a control circuit. The temperature information of the temperature sensor is taken into the control circuit as control information. The control circuit does not capture the temperature information of the temperature sensor while the supply air blower is stopped, and the temperature of the detection target space (supply passage) where the temperature sensor is provided is stable after the supply air blower starts operation. Do not use the temperature information of the temperature sensor as control information until the time corresponding to the response time of the temperature sensor, the response time of the temperature sensor, and the time until the operation of the fan or electric shutter of the air supply blower stabilizes To. The time until the temperature of the detection target space is stabilized becomes longer as the cross-sectional area of the air supply passage is larger. In this heat exchanging ventilator, since the detection target space where the temperature sensor is placed becomes an actual outside air atmosphere, the temperature information of the temperature sensor is used as control information and the necessity of energizing the heater is determined. Therefore, it is possible to perform an accurate control operation based on accurate outside air temperature information. Since the output value of the temperature sensor is not set to a high value in advance, the lower limit of the usable temperature of the heat exchanger can be expanded, and a heat exchange ventilator that does not consume useless power can be obtained.

Embodiment 1 FIG.
1 is a block diagram showing a heat exchange ventilator according to the present embodiment, FIG. 2 is a flowchart showing temperature detection processing of the control circuit, FIG. 3 is a time chart showing temperature detection processing, and FIG. 4 is another temperature detection processing. The flowchart which shows. As shown in FIG. 1, the heat exchange ventilator of the present embodiment includes an exhaust passage 2 and an air supply passage 3 which are independent from each other, part of which is composed of a primary passage and a secondary passage of the heat exchanger 1. It has. The exhaust passage 2 incorporates an exhaust blower 4 that forms an exhaust flow from the room to the outside. The air supply passage 3 incorporates an air supply blower 5 that forms an air supply air flow from the outdoor to the indoor. A temperature sensor 6 such as a thermistor is provided in the supply passage 3 at the inlet side portion of the secondary passage of the heat exchanger 1. A heater 8 is provided in the vicinity of the outdoor suction port of the air supply duct 7 in the air supply passage 3 to raise the temperature of the air supply flowing through the air supply duct 7. A normally closed electric shutter 9 for opening and closing the air supply duct 7 is provided upstream of the heater 8 in the air supply duct 7, and a normally closed electric motor for opening and closing the exhaust duct 10 is provided near the outdoor outlet of the exhaust duct 10. A shutter 11 is provided.

  The supply blower 5, the exhaust blower 4, the heater 8, and the electric shutters 9 and 11 are controlled by a control circuit 12 having a microcomputer. The control circuit 12 is provided with drive contacts for turning on / off the electric shutters 9 and 11 together with the drive circuits of the air supply blower 5 and the exhaust blower 4, and the electric shutters 9 and 11 are driven by the drive contacts. Is turned on and off. Further, the control circuit 12 is provided with a drive contact for turning on / off the heater 8, and the power of the heater 8 is turned on and off by this drive contact. The temperature sensor 6 and the remote controller 13 are connected to the input side of the control circuit 12 by signal lines.

  When the power is turned on, the control circuit 12 performs a temperature detection process according to the flowchart shown in FIG. That is, the delay time T is calculated in step # 1. The delay time T includes a time T1 until the operation of the fan of the air supply fan 5 and the electric shutter 9 is stabilized, and a detection target space (supply) in which the temperature sensor 6 is provided from when the air supply fan 5 starts operation. The time T2 until the air staying in the air passage) is swept away and the temperature is stabilized is compared with the response time T3 of the temperature sensor 6 and added to subtract the overlapping time. Then, the process proceeds to step # 2, and it is determined whether or not the supply air blower 5 is turned on. If it is turned on, the process proceeds to step # 3, and if it is turned off, the outside air does not enter the supply passage 3, so that the temperature is increased. No detection is performed.

  In step # 3, it is determined whether or not the operation mode has been changed. If there is a change in the operation mode, the temperature detection delay timer is cleared in step # 5. If there is no change in the operation mode, a delay is made in step # 4. The timer is compared with the delay time T. If the delay timer is equal to or shorter than the delay time T, the delay timer is counted in step # 7, but the temperature sensor 6 does not detect the temperature. If the delay timer exceeds the delay time T, the temperature is detected by the temperature sensor 6 in step # 6, and the operation mode is controlled using this as control information. Replace with the operation mode to finish the process. FIG. 3 is a time chart of such temperature detection processing. Further, as shown in the flowchart of FIG. 4, temperature detection may be performed first, and it may be determined whether or not to control the operation mode based on the detected temperature. In this case, the delay time T is calculated in the same manner as in the previous section, the supply air blower 5 is turned on and the operation mode is not changed, the temperature detection delay timer is compared with the delay time T, and the delay timer exceeds the delay time T. Then, the operation mode is controlled based on the temperature detected by the temperature sensor 6.

  Thus, temperature measurement and control of the operation mode are performed only when the ON time of the air supply blower 5 has exceeded the delay time T, so that temperature measurement at an unstable timing such as when the operation mode is changed can be performed. , It is possible not to perform control by it. As a result, the accuracy of temperature measurement can be improved, the malfunction can be prevented by the reliable measurement of the actual temperature, and an accurate control operation based on accurate outside air temperature information can be performed.

  Regarding the delay time T, when the diameter of the air supply passage 3 is small and the temperature stabilization time of the detection target space is extremely short compared to the response time of the temperature sensor 6, the temperature stabilization time of the detection target space is ignored. Also good. In addition, by making T1 and T2 variable according to the number of components related to the supply of air in the supply passage 3, the operation responsiveness of the supply blower 5 can be improved.

  The method of setting the delay time T for temperature detection of the temperature sensor according to the present invention can also be used for an air conditioner. The time until the stable operation of the members constituting the air conditioner such as the fan and compressor is T1, the time until the room temperature is stabilized is T2, the response time of the temperature sensor is T3, and the delay time T Is calculated.

It is a block block diagram which shows a heat exchange ventilation apparatus. (Embodiment 1) It is a flowchart which shows the temperature detection process of a control circuit. (Embodiment 1) It is a time chart which shows a temperature detection process. (Embodiment 1) It is a flowchart which shows another temperature detection process. (Embodiment 1)

Explanation of symbols

  1 heat exchanger, 2 exhaust passage, 3 air supply passage, 4 exhaust air blower, 5 air supply air blower, 6 temperature sensor, 12 control circuit.

Claims (2)

  A part of the path is provided with an exhaust passage and an air supply passage composed of a primary passage and a secondary passage of a heat exchanger, and a blower for forming an exhaust flow from the room to the outside is incorporated in the exhaust passage. The air passage incorporates a blower that forms a supply air flow from the outside to the room, and a temperature sensor that outputs temperature information to the control means is provided in the supply passage in the inlet side portion of the secondary passage of the heat exchanger. The heat exchange ventilator is configured to control the operation by the control means, and the control means does not take in the temperature information of the temperature sensor while the blower that forms the supply airflow is stopped. The time from the start of operation until the temperature of the detection target space provided with the temperature sensor stabilizes, the response time of the temperature sensor, and the time corresponding to the operation stabilization time of the blower-related equipment related to supply air Until then, Heat exchange ventilator to not use the temperature information as the control information of the serial temperature sensor.   It is a heat exchange ventilation apparatus of Claim 1, Comprising: Time until the temperature of the detection object space in which the temperature sensor was provided becomes stable, Response time of the said temperature sensor, Operation stability of the ventilation related apparatus regarding air supply A heat exchange ventilator that can change the time according to the time.

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