CN104949255B

CN104949255B - Air interchanger

Info

Publication number: CN104949255B
Application number: CN201510141772.1A
Authority: CN
Inventors: 岛康晃; 铃木康浩; 桥本俊彦; 安西辉显; 石黑贤一; 饭尾耕次
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2014-03-28
Filing date: 2015-03-27
Publication date: 2020-01-10
Anticipated expiration: 2035-03-27
Also published as: JP2015190687A; JP6295422B2; CN104949255A

Abstract

The ventilation device of the present invention comprises: an external air suction port (12) for sucking external air, an indoor air supply port (13) for supplying external air to the indoor, an indoor suction port (7) for sucking indoor air, and an exhaust port (14) for exhausting indoor air to the outside. The air conditioner further comprises an air supply fan (3) for sending outside air from an outside air inlet to an indoor air supply port, an exhaust fan (4) for sending indoor air from the indoor air inlet to an exhaust port, and an air cleaning filter (5) for cleaning the outside air, the air cleaning filter being provided on the downstream side of the outside air inlet. The control unit (6) increases the volume of outside air blown by the supply fan by a given amount relative to the volume of indoor air blown by the exhaust fan.

Description

Air interchanger

Technical Field

The present invention relates to a ventilation device for ventilating indoor air.

Background

As a conventional ventilator, an air conditioner is known which automatically switches between ventilation cooling and heating and air purification cooling and heating according to the degree of pollution of indoor air (see, for example, patent document 1).

A conventional ventilation apparatus will be described below with reference to fig. 2. Fig. 2 is a top view of a conventional ventilation apparatus.

The ventilator 101 includes: a blower fan 103, a cold/hot water coil 104, an exhaust fan 106, an air supply fan 107, a total heat exchanger 108, an air cleaner 109, a damper 110, and a sensor 111. The blower fan 103 is driven by the blower motor 102. The cold/hot water coil 104 heats or cools the air discharged from the air blowing fan 103. The exhaust fan 106 and the air supply fan 107 are driven by an exhaust motor 105. The total enthalpy heat exchanger 108 exchanges heat between air discharged to the outside by the exhaust fan 106 and air supplied from the outside by the supply fan 107. The air cleaning device 109 has dust collecting and deodorizing functions. The damper 110 automatically switches whether to guide the air from the room to the ventilation part or to the air cleaning part at a proper time. The sensor 111 senses the degree of contamination from the air in the room.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 63-156946

Disclosure of Invention

In the conventional ventilation device, the demand for air supply purification is high along with the problem of PM2.5, and in particular, even in a ventilation system equipped with a high-performance filter, dust cannot be prevented from entering from a gap of a building. Therefore, the conventional ventilation device has a problem that the indoor environment cannot be maintained at a good cleanliness.

The present invention solves the conventional problems by intentionally increasing the amount of supplied air to be larger than the amount of discharged air, and maintaining the indoor pressure at a positive pressure. This prevents dust from entering through the gap of the building. In addition, the invention can keep the indoor air at a good cleanness because the air supplied to the indoor passes through the filter.

An air exchange device according to an aspect of the present invention includes: an outside air suction inlet for sucking outside air; an indoor air supply port for supplying outdoor air to the indoor space; an indoor suction port for sucking indoor air; and an exhaust port for discharging the indoor air to the outside. In addition, the air supply fan is used for sending the outside air from the outside air suction inlet to the indoor air supply inlet; an exhaust fan for sending indoor air from the indoor suction inlet to the exhaust outlet; and an air cleaning filter provided on the downstream side of the outside air inlet port and used for cleaning the outside air. In addition, the control unit controls the operation of the air supply fan and the air exhaust fan. The control unit increases the volume of the outside air blown by the supply fan by a predetermined amount compared to the volume of the indoor air blown by the exhaust fan.

According to the present invention, the outdoor pollen or suspended particles are removed by the air cleaning filter, and the air volume of the outdoor air is made larger than the air volume of the indoor air by a certain amount, thereby making the indoor space positive pressure. Therefore, the air supplied to the room is clean air passing through the filter, and the indoor space is maintained at a positive pressure, whereby dust can be prevented from entering from the gaps of the building, and a clean air environment of the indoor space can be maintained.

Drawings

Fig. 1 is a top sectional view showing a ventilator according to an embodiment of the present invention.

Fig. 2 is a top view of a conventional ventilation apparatus.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below.

Fig. 1 is a top sectional view showing a ventilator according to an embodiment of the present invention. As shown in fig. 1, the heat exchange device 1 of the present embodiment is provided with a heat exchange element 2, an air supply fan 3, and an air discharge fan 4 inside a main body. The supply air fan 3 operates to take outdoor air (outside air a) into the room. The exhaust fan 4 operates to discharge the indoor air (indoor air B) to the outside. When the heat exchange element 2 exchanges air between the indoor air B and the outdoor air a, heat and humidity are exchanged between the indoor air B and the outdoor air a. The air supply fan 3 and the air exhaust fan 4 use centrifugal fans.

The heat exchange device 1 has an outside air intake port 12 through which the outside air a is taken in, and an indoor air supply port 13 through which the taken-in outside air a is supplied to the room. The heat exchange device 1 has an indoor suction port 7 through which the indoor air B is sucked, and an exhaust port 14 through which the sucked indoor air B is discharged to the outside. The outside air a passes through an air supply passage from the outside air intake port 12 to the indoor air supply port 13. The indoor air B passes through an exhaust air passage from the indoor suction port 7 to the exhaust port 14.

In the supply air passage, an outdoor air cleaning filter 5 for cleaning the outdoor air a is provided between the outdoor air inlet 12 and the heat exchange element 2. The outside air a passes through the air cleaning filter 5 almost entirely, and a part of the suspended particles contained in the outside air a is removed. In the exhaust air passage, a pre-filter (pre-filter)15 for protecting the heat exchange element 2 from contamination is provided between the indoor suction port 7 and the heat exchange element 2. A dust sensor 8 for detecting the amount of suspended particles contained in the indoor supply air is provided downstream of the indoor air supply port 13. A dust sensor 9 for detecting the amount of suspended particles contained in the outside air a is provided on the downstream side of the outside air inlet 12 of the outside air a.

In addition, a temperature/humidity sensor 10 is provided in the vicinity of the outside air inlet 12. The temperature/humidity sensor 10 detects the temperature/humidity of the outside air a.

A temperature/humidity sensor 11 is provided near the indoor suction port 7. The temperature/humidity sensor 11 detects the temperature/humidity of the indoor air B. The control unit 6 calculates external resistance of pipes connected to the connection ports of the main body, i.e., the indoor suction port 7, the external air suction port 12, the indoor air supply port 13, and the exhaust port 14, and resistance due to daily filter clogging. Further, the control unit 6 controls the rotation speed of the fan or the motor current. That is, the control unit 6 controls the operations of the air supply fan 3 and the air discharge fan 4. This can always keep the air volume constant.

The control unit 6 performs operation control in an operation mode that is most suitable for an environment such as a season using the dust sensors 8 and 9 and the temperature/

humidity sensors

10 and 11.

Further, the control unit 6 is provided in the main body of the heat exchanger 1, but the control unit 6 may be provided at a position apart from the main body of the heat exchanger 1, or the ventilator may be controlled by the remote control unit 6.

Middle period operation mode

For example, the climate in spring is good, the temperature and humidity are good, and comfort is often the case even if an air conditioner such as an air conditioner is not used. However, in recent years, problems such as pollen, yellow sand, and PM2.5 have been becoming more pronounced from the end of winter to spring, and there is no clean air even outdoors. In such an environment, the exhaust air volume is reduced by controlling the rotation speeds of the supply fan 3 and the exhaust fan 4, that is, the air volume control, based on the amount of suspended particles detected by the dust sensor 9. That is, the control is performed so that the exhaust air volume is smaller than the supply air volume by a certain amount. In other words, the exhaust air volume is reduced with respect to the required ventilation volume (ventilation volume determined according to the building area, temperature conditions, and the like). This causes the indoor space to have a positive pressure, prevents the suspended particles from entering through the window or the gap between the wall surfaces, and maintains a clean air environment in the indoor space. Further, the electric power of the motor is saved by reducing the rotation speed of the exhaust fan 4.

In addition, in autumn in the same middle period, the climate is good as in spring, and the influence of pollen, yellow sand and dust is small. In such an environment, the dust sensor 9 confirms that the amount of dust is small, and the exhaust air volume is reduced. Further, the power saving is performed so that the exhaust air volume is smaller than the supply air volume by a predetermined amount. In other words, the exhaust air volume is reduced relative to the required ventilation volume (ventilation volume determined according to the building area, temperature conditions, and the like).

Summer operation mode

In summer, although the influence of pollen, yellow sand, and dust is small, the temperature and humidity are high and uncomfortable, and the indoor space is set to a cooling operation state for a long time by an air conditioner. In such an environment, when the dust sensor 9 confirms that the amount of dust is small, the exhaust air volume is controlled to 1:1 with respect to the supply air volume, and the air conditioning load is reduced by heat recovery by the heat exchange element 2.

However, even in summer, in an environment with dust pollution along the road, the rotation speeds of the air supply fan 3 and the air discharge fan 4, that is, the air volume control is performed based on the amount of suspended particles detected by the dust sensor 9.

In addition, in summer, mites, molds, and the like propagate indoors due to the influence of heat. Therefore, contaminated air containing dead bodies of mites, mold, or the like is generated in the room. In order to discharge the polluted air to the outside, the supply air volume is increased without reducing the exhaust air volume, and the supply air volume is controlled to be larger than the exhaust air volume by a certain amount. In other words, the supply air volume is increased with respect to the required ventilation volume (ventilation volume determined according to the building area, temperature conditions, and the like). This causes the indoor space to have a positive pressure, prevents the suspended particles from entering through gaps such as windows and wall surfaces, and maintains a clean air environment in the indoor space.

In summer, the operation may be performed such that the supply air volume satisfies the required ventilation volume and the exhaust air volume is larger than the required ventilation volume based on the detection value of the temperature/humidity sensor 10.

Winter operation mode

In winter, the influence of pollen or PM2.5 dust from continents is large in early spring. Further, since the temperature and humidity are low, the indoor space is heated for a long time by the air conditioner. As a result, the temperature difference between the indoor and outdoor becomes large, and natural ventilation (air leakage) from the whole home occurs. In addition, the relative humidity decreases due to heating, and the air becomes dry. Then, the natural ventilation (air leakage) amount is calculated by an experiment based on the indoor/outdoor pressure difference caused by the temperature difference between the temperature/humidity sensor 10 and the temperature/humidity sensor 11 and the C value of the house (the area corresponding to the space of the house). Further, the electric power of the motor is reduced by reducing the exhaust air volume corresponding to the calculated natural ventilation (blow-by) volume. Further, the exhaust air volume is controlled so as to be smaller than the supply air volume by a certain amount based on the amount of suspended particles detected by the dust sensor 9. In other words, the exhaust air volume is reduced with respect to the required ventilation volume (ventilation volume determined according to the building area, temperature conditions, and the like). This causes the indoor space to have a positive pressure, prevents the suspended particles from entering through gaps such as windows and wall surfaces, and maintains a clean air environment in the indoor space. Further, energy saving of the electric power of the motor and heat recovery by air in the heat exchange element 2 can reduce the air conditioning load, and the excessive drying of the indoor space can be prevented by humidity recovery by the heat exchange element 2. As a result, a comfortable environment can be provided to the occupants.

The above-mentioned seasons are examples, and an optimum operation mode is actually determined as follows from the temperature (RA) detected by the temperature/humidity sensor 10 and the temperature (OA) detected by the temperature/humidity sensor 11. Further, the detection results of dust sensor 8 and dust sensor 9 are added to set the optimum operating state.

The operation mode determination is, for example, as follows.

Judging that: … 'winter running mode' under the condition that OA is less than or equal to 20℃,

… 'summer running mode' under the condition that OA is more than or equal to 24℃,

… 'winter running mode' under the condition that OA is more than 20 ℃ and RA is less than or equal to 20℃,

… 'summer running mode' under the condition that OA is more than 20 ℃ and less than 24 ℃ and RA is more than or equal to 24℃,

… 'middle period running mode' of the case that 20 ℃ is less than OA and less than 24 ℃ and 20 ℃ is less than RA and less than 24 ℃,

the operation control is performed as described above.

In the present embodiment, the method of determining the season uses 2 conditions of the outside air and the indoor air, but the determination may be made only by the outside air.

In this way, the collection of dust by the air cleaning filter plays an extremely important role in order to perform optimum operation control in each season or environment. The dust sensor 8 detects dust in the air supply path, that is, dust entering from the main body gap due to filter clogging. Thereby, it is confirmed whether the air cleaning filter functions normally. This causes dust sensor 8 to notify the filter replacement timing.

As described above, the ventilation device of the present embodiment includes: an external air suction port 12 for sucking external air, an indoor air supply port 13 for supplying external air into the room, an indoor suction port 7 for sucking indoor air, and an exhaust port 14 for discharging indoor air to the outside. The air cleaner includes an air supply fan 3 for supplying outside air from an outside air inlet 12 to an indoor air supply port 13, an exhaust fan 4 for supplying indoor air from an indoor air inlet 7 to an exhaust port 14, and an air cleaning filter 5 for cleaning outside air provided on the downstream side of the outside air inlet 12. The operation of the air supply fan 3 and the air discharge fan 4 is controlled by the control unit 6. The control unit 6 increases the volume of the outside air blown by the supply fan 3 by a certain amount compared to the volume of the room air blown by the exhaust fan 4.

Thus, the outdoor pollen or suspended particles are removed by the air cleaning filter 5, and the outdoor air volume is made larger than the indoor air volume by a certain amount, thereby making the indoor space positive in pressure. Therefore, the air supplied to the room is almost all clean air passing through the filter, and dust can be prevented from entering from the gap of the building, thereby maintaining a clean air environment of the indoor space.

Further, a dust sensor 8 for detecting the amount of dust in the outside air is provided. When the amount of dust detected by dust sensor 8 exceeds a predetermined value, controller 6 increases the volume of outside air by a predetermined amount compared to the volume of indoor air. Thus, since the dust sensor 8 detects the suspended particles and the ventilation air volume is automatically controlled according to the detected amount, almost all the air supplied to the room is clean air passing through the filter, and the indoor positive pressure of the indoor space can be adjusted according to the amount of the suspended particles. Therefore, it is possible to further prevent dust from entering from the gap of the building, maintain a clean air environment of the indoor space, and reduce the difference between the air volume of the outside air and the air volume of the indoor air when the amount of suspended particles is small, thereby achieving energy saving.

Further, a first temperature sensor corresponding to the temperature/humidity sensor 10 for detecting the temperature of the outside air is included. The control unit 6 operates such that the external air volume satisfies the necessary ventilation amount and the indoor air volume is larger than the necessary ventilation amount when it is determined that the summer season is the season based on the detection value of the first temperature sensor. When it is determined that the air volume of the outside air satisfies the required ventilation volume based on the detection value of the first temperature sensor, the control unit 6 operates so that the air volume of the indoor air is smaller than the required ventilation volume. Thus, the sensor detects the indoor and outdoor temperature, and the ventilation air volume is automatically controlled according to the temperature difference. Therefore, the air supplied to the room is almost all clean air passing through the filter, and the indoor space is maintained at a positive pressure, thereby preventing dust from entering from the gaps of the building and maintaining a clean air environment of the indoor space. Further, since the temperature difference between the indoor and outdoor sides is large in winter, natural ventilation (air leakage) can be estimated, the number of times of ventilation can be adjusted, and energy saving can be achieved.

The necessary ventilation amount is an amount of ventilation required to ventilate the indoor space. The necessary ventilation amount varies according to the size of the indoor space. The control unit 6 controls the operation of the air supply fan 3 and the air discharge fan 4 based on a preset necessary ventilation amount.

Further, a second temperature sensor corresponding to the temperature/humidity sensor 11 for detecting the temperature of the indoor air is provided. The determination of summer, winter and middle period is performed based on the detection value of the first temperature sensor corresponding to the temperature and humidity sensor 10 and the detection value of the second temperature sensor corresponding to the temperature and humidity sensor 11. This enables ventilation according to the season.

Further, a heat exchanger corresponding to the heat exchange element 2 for exchanging heat between the outside air and the indoor air is included. Thus, the heat discarded together with the discharged air in the heat exchanger is recovered at the time of air supply, and is returned to the room. Therefore, the air supplied to the room is almost all clean air passing through the filter, and the indoor space is maintained at a positive pressure, whereby it is possible to prevent dust from entering from the gaps of the building, maintain a clean air environment of the indoor space, and reduce the air conditioning load by heat recovery.

Further, the ventilation device of the present embodiment includes: an external air suction port 12 through which external air is sucked, an indoor air supply port 13 through which external air is supplied into the room, an indoor suction port 7 through which indoor air is sucked, and an exhaust port 14 through which indoor air is exhausted to the outside. The air cleaner includes an air supply fan 3 for supplying outside air from an outside air inlet 12 to an indoor air supply port 13, an exhaust fan 4 for supplying indoor air from an indoor air inlet 7 to an exhaust port 14, and an air cleaning filter 5 for cleaning outside air provided on the downstream side of the outside air inlet 12. Further, a first temperature sensor corresponding to the temperature/humidity sensor 10 for detecting the temperature of the outside air and a second temperature sensor corresponding to the temperature/humidity sensor 11 for detecting the temperature of the indoor air are provided. The operation of the air supply fan 3 and the air discharge fan 4 is controlled by the control unit 6. The temperature detected by the first temperature sensor is RA, and the temperature detected by the second temperature sensor is OA. The control unit 6 increases the volume of the outside air blown by the supply fan 3 by a predetermined amount in comparison with the volume of the room air blown by the exhaust fan 4 when OA is not more than 20 ℃, when OA is less than 24 ℃ and RA is not more than 20 ℃, or when OA is less than 20 ℃ and RA is less than 24 ℃, or when RA is less than 20 ℃ < OA is less than 24 ℃. The control unit 6 controls the volume of the outside air sent by the supply fan 3 and the volume of the indoor air sent by the exhaust fan 4 to be 1:1 when OA is equal to or higher than 24 ℃ or 20 ℃ < OA < 24 ℃ and RA is equal to or higher than 24 ℃.

Thus, the outdoor pollen or suspended particles are removed by the air cleaning filter 5, and the outdoor air volume is made larger than the indoor air volume by a certain amount, thereby making the indoor space positive in pressure. Therefore, the air supplied to the room is almost all clean air passing through the filter, and dust can be prevented from entering from the gap of the building, thereby maintaining a clean air environment of the indoor space. Further, the air conditioning load can be reduced by equalizing the volume of outside air and the volume of indoor air.

The present invention is applicable to a ventilator used in a house or the like, and particularly to a ventilator and a ventilation system that simultaneously perform air supply and air discharge.

Claims

1. A ventilation device, comprising:

an outside air suction inlet for sucking outside air;

an indoor air supply port for supplying the outside air to the indoor space;

an indoor suction port for sucking indoor air;

an exhaust port for exhausting the indoor air to the outside;

an air supply fan for sending the outside air from the outside air inlet to the indoor air supply port;

an exhaust fan for sending the indoor air from the indoor suction port to the exhaust port; and

an air cleaning filter provided on the downstream side of the outside air inlet and used for cleaning the outside air,

the operation of the air supply fan and the air exhaust fan is controlled by a control part,

the control unit increases the volume of the outside air blown by the supply fan by a predetermined amount compared to the volume of the room air blown by the exhaust fan,

further comprising a first temperature sensor that detects the temperature of the outside air,

the control unit operates such that the volume of the outside air satisfies a required ventilation amount and such that the volume of the indoor air is smaller than the required ventilation amount when it is determined that the air flow rate is in the winter season or in the middle period based on the detection value of the first temperature sensor.

2. The air gasper of claim 1, wherein:

further comprising a dust sensor for detecting the amount of dust in the outside air,

the control unit increases the volume of the outside air by a predetermined amount from the volume of the indoor air when the amount of the dust detected by the dust sensor exceeds a predetermined value.

3. The ventilation device according to claim 1 or 2, wherein:

further comprising a second temperature sensor detecting a temperature of the indoor air,

the control unit determines summer, winter, and middle periods based on the detection value of the first temperature sensor and the detection value of the second temperature sensor.

4. The air gasper of claim 1, wherein:

further comprising a heat exchanger for exchanging heat between the outside air and the indoor air.