JP3480402B2 - Ventilation equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device equipped with a total heat exchanger.

[0002]

2. Description of the Related Art Conventionally, as a ventilation device, a total heat exchanger is arranged across an air supply passage and an exhaust passage, and heat is recovered by exchanging heat between the air supply and the exhaust. In addition, it is known that a CO ₂ sensor is arranged in the exhaust passage to perform ventilation operation control based on the CO ₂ concentration in the exhaust.

Meanwhile, CO ₂ sensor provided in such a ventilator is usually self-calibration formula CO ₂ sensors are employed. Self calibration of the CO ₂ sensor, a minimum value of the output of the CO ₂ sensor as a reference, there is performed a relative sensitivity change the output correction to replace the absolute concentrations, typically, CO in the atmosphere Self-calibration is performed based on ₂ concentrations (about 350 ppm). Therefore, in order to self-calibration of the CO ₂ sensor is performed accurately becomes a necessary condition that the atmosphere to securely contact with the CO ₂ sensor at the installation environment of CO ₂ sensor.

[0004] In this case, the conventional general, under assumption of the CO ₂ concentration of the installation environment of the CO ₂ sensor during the operation stop of the ventilation device such as at night drops to atmospheric concentration levels by natural decay, CO ₂ during operation stop Air in the installation environment comes into contact with the sensor so that self-calibration is automatically performed.

[0005] However, according CO ₂ concentration self-calibration of the CO ₂ sensor based on the natural decay, since it likely may not be expected that depending on its installation environment to lower the CO ₂ concentration to atmospheric level, in such a case , self-calibration of the CO ₂ sensor of CO ₂ concentration above atmospheric density level as a reference is made, CO ₂ sensor indicates the low density of the output value than the actual CO ₂ concentration of the installation environment, consequently by CO ₂ sensor There is concern that the control accuracy of the ventilator will be impaired.

[0006] There are thought to be ensured these circumstances, proper self-calibration relative to the atmospheric concentration levels by supplying CO ₂ aggressive atmosphere during self-calibration of the sensor in the vicinity CO ₂ sensor (e.g. , Japanese Patent Application Laid-Open No. 7-324788).

[0007]

However, in the ventilator such as the above-mentioned conventional example, an exhaust fan is used as a means for supplying the atmosphere to the vicinity of the CO ₂ sensor when the CO ₂ sensor is self-calibrated. Reversible operation is possible, and during self-calibration, this is reversed and the atmosphere is introduced to the CO ₂ sensor side through the exhaust passage, or a fan dedicated to self-calibration is provided, and the structure is complicated, leading to an increase in cost. There was a problem.

[0008] Therefore, the present invention has been made for the purpose of effectively utilizing the essential constituent members of the ventilator to improve the reliability of the ventilation control based on the CO ₂ sensor without increasing the cost. .

[0009]

In the present invention, the following constitution is adopted as a concrete means for solving such a problem.

According to the first aspect of the present invention, the air supply passage 3 is provided which is provided with the air supply fan 7 and introduces the atmosphere into the indoor space 20. An exhaust passage 4 for discharging the exhaust air to the outside of the room is provided, and a total heat exchanger 10 is arranged across the supply passage 3 and the exhaust passage 4 to perform heat exchange between the supply air and the exhaust. together occupy performed, the ventilation apparatus having a CO ₂ sensor 15 in the exhaust passage 4, at the end of the normal ventilation operation, the upper
Both the air supply fan 7 and the exhaust fan 8 are set to the maximum air volume.
The air supply passage 3 into the indoor space 20.
From the outlet 12 to the exhaust introduction port 13 of the exhaust passage 4
A characteristic feature is that air is supplied to the CO ₂ sensor 15 portion by generating an air flow .

In the second invention of the present application, the air supply fan 7 is provided.
An air supply passage for introducing the atmosphere into the indoor space 20 as air supply
3 and an exhaust fan 8 inside the indoor space 20
An exhaust passage 4 for exhausting air as an exhaust air to the outside of the room
On the other hand, the total heat is straddled between the air supply passage 3 and the exhaust passage 4.
The exchanger 10 is arranged to perform heat exchange between the air supply and the air exhaust.
In addition, a CO ₂ sensor 15 is installed in the exhaust passage 4.
In the provided ventilation device, at the end of the normal ventilation operation, only the exhaust fan 8 is operated for a predetermined time while the operation of the air supply fan 7 is stopped, and after the predetermined time elapses, the exhaust fan 8 It is characterized and Turkey to stop the operation.

In the third invention of the present application, the air supply fan 7 is provided.
An air supply passage for introducing the atmosphere into the indoor space 20 as air supply
3 and an exhaust fan 8 inside the indoor space 20
A main exhaust passage 4 for exhausting air to the outside as an exhaust air;
The indoor air in the indoor space 20 is exhausted to the outside as exhaust air.
The auxiliary exhaust passage 5 and the main exhaust passage 4 and the auxiliary exhaust passage 5.
Either of these is provided between the exhaust passage 5 and the indoor space.
While providing a switching means 9 for communicating with the space 20,
The total heat exchanger 10 straddles between the passage 3 and the main exhaust passage 4.
Is installed to perform heat exchange between the air supply and exhaust.
In addition, the exhaust passage 4 is provided with a ventilation provided with a CO ₂ sensor 15.
In the device, at the end of the normal ventilation operation, in a state where the auxiliary exhaust passage 5 is communicated with the indoor space 20 by the switching means 9, the air supply fan is stopped while the operation of the exhaust fan 8 is stopped. 7 only and at the end of the basic operating cycle that is operated for a predetermined time, and wherein the score repeated multiple times the basic operating cycle.

[0013]

According to the present invention, the following effects can be obtained by adopting such a configuration.

In the ventilation device according to the first aspect of the present application, the indoor space 2 is provided with the air supply fan 7 and the atmosphere as the air supply.
0, and an exhaust passage 4 for exhausting the indoor air in the indoor space 20 as exhaust gas, and an exhaust passage 4 for introducing the exhaust air to the outside of the indoor space 20.
The total heat exchanger 10 is arranged so as to straddle between the exhaust gas and the exhaust gas to exchange heat between the supply air and the exhaust gas, and the exhaust passage 4 is provided with a CO ₂ sensor 15. At the end of ventilation operation, the above-mentioned air supply fan 7 and exhaust fan
8 and 8 are operated with the maximum air volume,
From the air supply outlet 12 of the air supply passage 3 to the exhaust passage 4
Air is supplied to the CO ₂ sensor 15 portion by generating an air flow toward the exhaust gas introduction port 13 .

Therefore, according to the ventilator according to the invention of claim 1, the CO ₂ sensor 15 portion is provided by using only the air supply fan 7 and the exhaust fan 8 which are originally provided in the ventilator. Since the supply air can be supplied and self-calibration can be performed, the CO ₂ sensor 15 can be constructed at a lower cost than, for example, a case where a special fan or a fan dedicated to self-calibration is provided as in the above-described known example. The self-calibration can be performed accurately, and the cost reduction of the ventilation device and the improvement of the reliability of ventilation control are compatible.

Further , in this case, the air supply fan 7 and the air exhaust fan 8 are operated together by the operation at the end, and the air is supplied from the air supply outlet 12 of the air supply passage 3 into the indoor space 20. since the air flow toward the exhaust inlet 13 of the exhaust passage 4 is produced, the supply air flowing through the exhaust passage 4 through the exhaust inlet 13 is reliably in contact with the CO ₂ sensor 15, the CO ₂ The self-calibration of the sensor 15 is properly performed with the atmospheric concentration level of CO ₂ as a reference, and a high level control accuracy of the ventilation device based on the output of the CO ₂ sensor 15 is secured.

[0017]   Of the present applicationSecond inventionTo the ventilation system
According toIndoor air with air supply fan 7 as air supply
The air supply passage 3 introduced into the space 20 and the exhaust fan 8 are provided.
The indoor air in the indoor space 20 is exhausted to the outside as exhaust air.
And an exhaust passage 4 for
The total heat exchanger 10 is arranged so as to straddle the path 4 and supply and exhaust air.
The heat exchange with the air is performed and the exhaust passage
CO in 4 ₂ In the ventilator equipped with the sensor 15,
At the end of regular ventilation operation,Stop the operation of the air supply fan 7
Operate only the exhaust fan 8 for a predetermined time while stopped
Then, the operation of the exhaust fan 8 is stopped after the lapse of the predetermined time.
LetRukoIt is characterized by.

Therefore, according to the ventilation device of the second invention of the present application, the air supply originally provided in the ventilation device .
The CO ₂ segregation is performed using only the fan 7 and the exhaust fan 8.
To supply self-calibration by supplying air to the sensor 15 part.
Therefore, special files such as the above-mentioned known examples can be used.
Compared with the case where a fan dedicated to self-calibration is installed,
Accurate self-calibration of the CO ₂ sensor 15 with an inexpensive structure
Can reduce the cost of the ventilation system and ventilation
Both improvement of control reliability is achieved.

Further , in this case, by the operation at the end , only the exhaust fan 8 is operated for a predetermined time while the operation of the air supply fan 7 is stopped, and after the predetermined time has elapsed, the exhaust fan 8 is operated. Since the operation of the exhaust fan 8 is stopped, first, only the exhaust fan 8 is operated, so that the internal pressure of the indoor space 20 becomes a negative pressure state lower than the atmospheric pressure. When the operation is stopped, the atmospheric pressure penetrates from the outdoor side to the indoor space 20 side through the exhaust passage 4 due to the pressure difference between the outdoor space and the indoor space 20, and the invaded atmospheric air is the CO ₂ sensor 15
Surely comes into contact with. As a result, the self-calibration of the CO ₂ sensor 15 is properly performed with the atmospheric concentration level of CO ₂ as a reference, and a high level control accuracy of the ventilation device based on the output of the CO ₂ sensor 15 is secured.

According to the ventilator of the third invention of the present application, the indoor air is supplied by using the air supply fan 7.
The air supply passage 3 introduced into the space 20 and the exhaust fan 8 are provided.
The indoor air in the indoor space 20 is exhausted to the outside as exhaust air.
The main exhaust passage 4 and the indoor air in the indoor space 20
And an auxiliary exhaust passage 5 for discharging the exhaust air to the outside of the room.
Between the main exhaust passage 4 and the auxiliary exhaust passage 5,
Switching means for selectively communicating both with the indoor space 20
9 between the air supply passage 3 and the main exhaust passage 4
The total heat exchanger 10 is arranged over the
While exchanging heat, CO is introduced into the exhaust passage 4.
_In a ventilation system equipped with _two sensors 15,
At the end of the rotation, in the state where the auxiliary exhaust passage 5 is communicated with the indoor space 20 by the switching means 9, the air supply fan 7 is operated while the operation of the exhaust fan 8 is stopped.
Only the end of the basic operating cycle that is operated for a predetermined time, and wherein the score repeated multiple times the basic operation cycle <br/>.

Therefore, according to the ventilator of the third aspect of the present invention , only the air supply fan 7 and the exhaust fan 8 and the switching means 9 that are originally provided in the ventilator are used. Since air can be supplied to the CO ₂ sensor 15 and self-calibration can be performed, the configuration is cheaper than the case where a special fan or a fan dedicated to self-calibration is provided as in the above-mentioned known example. Thus, the CO ₂ sensor 15 can be accurately self-calibrated, and the cost reduction of the ventilation device and the improvement of the ventilation control reliability can be achieved at the same time.

Further, the air by only the air supply fan 7 is operated is introduced into the interior space 20, the space 20 the chamber becomes higher positive pressure than the atmospheric pressure, the interior space 20 Since the exhaust introduction port 13 communicates with the sub exhaust passage 5 by the switching means 9, the atmosphere introduced into the room is discharged to the outside through the sub exhaust passage 5.
It is not introduced into the main exhaust passage 4 side.

In this way, after the operation of only the air supply fan 7 is continued for a predetermined time, the basic operation cycle at the end when the operation of the air supply fan 7 is stopped is repeated a plurality of times. The air supply fan 7 in the operation cycle
Each time the operation of (3) is stopped, the atmosphere on the upstream side (suction side) of the air supply fan 7 is compressed by its flow inertia, and its pressure instantaneously rises to atmospheric pressure or higher. Becomes higher than the internal pressure of the main exhaust passage 4, and due to the pressure difference between the two, a leakage flow of air from the air supply passage 3 side to the main exhaust passage 4 side is generated in the total heat exchanger 10. The generated leaked air is supplied to the side of the CO ₂ sensor 15 and comes into contact therewith, whereby the CO ₂ sensor 1
The self-calibration of 5 is properly performed with the atmospheric concentration level of CO ₂ as a reference, and a high level control accuracy of the ventilation device based on the output of the CO ₂ sensor 15 is secured.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a ventilation device according to the present invention will be specifically described based on preferred embodiments.

First Embodiment FIG. 1 shows a ventilation device 1 according to a first embodiment of the present invention. This ventilation device 1 is a ventilation mode in which heat is recovered between air supply and exhaust (hereinafter referred to as "total heat ventilation").
And a ventilation mode that does not perform such heat recovery (hereinafter referred to as “ordinary ventilation”), which is an air supply / exhaust type ventilation device. 3 and with a can Ru formed main exhaust passage 4,
A sub exhaust passage 5 is further provided on the side of the main exhaust passage 4.

The air supply passage 3 has an air supply inlet 11 provided at one end thereof which is exposed to the outside of the room directly or through an appropriate duct (not shown). The air supply outlet 12 provided at the other end of the air supply passage 3 is exposed to the indoor space 20 directly or through an appropriate duct (not shown). Then, the air supply outlet 1 of the air supply passage 3
An air supply fan 7 is provided at a position closer to the second position.

The main exhaust passage 4 has an exhaust introduction port 13 provided at one end thereof directly or in an appropriate duct (not shown).
It is exposed to the indoor space 20 through. Further, an exhaust air outlet 14 provided at the other end of the main exhaust passage 4
Are exposed to the outside directly or through an appropriate duct (not shown). An exhaust fan 8 is provided near the exhaust outlet 14 of the main exhaust passage 4. Further, the exhaust introduction port 13 is provided with the damper 9
(Corresponding to "switching means" in the claims), the main exhaust passage 4 and the sub-exhaust passage 5 can be selectively communicated with each other, and the damper 9 of the main exhaust passage 4 can be connected. Self-calibration CO ₂
A sensor 15 is provided.

Further, a total heat exchanger 10 is disposed between the air supply passage 3 and the main exhaust passage 4 so as to extend over both of them, and the air supply side of the total heat exchanger 10 is arranged. Passage part 10
Heat is recovered by heat exchange between the supply air passing through A and the exhaust air passing through the exhaust side passage portion 10B.

The damper 9 communicates the exhaust introduction port 13 with the main exhaust passage 4 at the first position shown by the solid line in FIG. 1, and the exhaust introduction port at the second position shown by the broken line. 13 is communicated with the auxiliary exhaust passage 5.

Next, the operation of the ventilation device 1 will be described. Note that FIG. 1 shows an operation mode at the end of the normal ventilation operation.

A: Normal ventilation operation In normal ventilation operation, "total heat ventilation" and "normal ventilation" are selected.

Ventilation operation by "total heat ventilation" is performed by operating both the air supply fan 7 and the exhaust fan 8 in the forward rotation direction with the damper 9 set to the first position. Be seen. In this “total heat ventilation”, the atmosphere is introduced from the outside as an air supply into the indoor space 20 through the air supply passage 3 by the air supply fan 7 while the exhaust fan 8 passes through the main exhaust passage 4 by the exhaust fan 8. The indoor air in the indoor space 20 is exhausted to the outside as exhaust air, and heat exchange is performed between the supply air on the air supply passage 3 side and the exhaust air on the main exhaust passage 4 side. The operation control of "total heat ventilation" is performed by controlling the air volume of the air supply fan 7 and the exhaust fan 8 based on the CO ₂ concentration in the exhaust gas detected by the CO ₂ sensor 15.

In the ventilation operation by "normal ventilation", the damper 9 is set to the second position, and the exhaust fan 8 is set.
This is performed by operating only the air supply fan 7 with the operation of No. 2 stopped. Therefore, the CO ₂ sensor 15 does not function in this "normal ventilation".

[0034] B: Operation for self-calibration operation the CO ₂ sensor 15 for self-calibration of the CO ₂ sensor 15, at the end of the normal ventilation operation, for example, the indoor space 20 finishing daytime business This is performed when the "total heat ventilation" or the "normal ventilation" of the ventilation device 1 is stopped due to the absence of a person, and corresponds to "operation at the end" in the claims.

The operation at the end of this operation is performed with the damper 9 set to the first position and the main exhaust passage 4 facing the indoor space 20 through the exhaust introduction port 13 for a predetermined time, This is performed by operating both the air supply fan 7 and the exhaust fan 8 at the maximum air volume in the forward rotation direction. When both the air supply fan 7 and the exhaust fan 8 are operated at the maximum air volume in the state where the main exhaust passage 4 faces the indoor space 20 as described above, as shown by a streamline in FIG. The supply air is introduced into the indoor space 20 from the supply air outlet 12, and the air in the indoor space 20 is introduced into the exhaust air introduction port 1
By being discharged from the room 3 through the main exhaust passage 4 to the outside of the room, an air flow flowing from the supply air outlet 12 to the exhaust inlet 13 is generated in the indoor space 20. In the operation at the end of this operation, there is no person in the indoor space 20, therefore, no new CO ₂ is generated, and the atmosphere is sequentially supplied from the air supply passage 3 side as the indoor space 2
When introduced into 0, the CO ₂ concentration in the air discharged to the main exhaust passage 4 side gradually decreases, and finally reaches the atmospheric concentration level. CO _{2 with} such an atmospheric concentration level
When the air having a concentration flows through the main exhaust passage 4, the air positively and surely comes into contact with the CO ₂ sensor 15 arranged in the main exhaust passage 4, thereby increasing the atmospheric concentration level. The CO ₂ sensor 15 used as a reference is self-calibrated, the detection accuracy is restored, and as a result,
The control accuracy by the CO ₂ sensor 15 at the time of “total heat ventilation” operation is improved. Moreover, in the operation at the end of this operation, the air supply fan 7 and the exhaust fan 8 originally provided for achieving the functions of the ventilation device 1 are installed without installing any dedicated member or the like. Since it is realized by using it, the cost of the ventilation device 1 does not increase. That is, the ventilation device 1 of this embodiment
In the above, it is possible to achieve both the control accuracy of the ventilation device 1 by realizing the proper self-calibration of the CO ₂ sensor 15 and the cost reduction of the ventilation device 1.

Second Embodiment FIG. 2 shows a ventilation device 1 according to a second embodiment of the present invention. This ventilation device 1 is a ventilation mode in which heat is recovered between air supply and exhaust (hereinafter referred to as "total heat ventilation").
And a ventilation mode that does not perform such heat recovery (hereinafter referred to as "normal ventilation"), which is an air supply / exhaust type ventilation device. 3 and with a can Ru formed main exhaust passage 4,
A sub exhaust passage 5 is further provided on the side of the main exhaust passage 4.

The air supply passage 3 has an air supply inlet 11 provided at one end thereof which is exposed to the outside of the room directly or through an appropriate duct (not shown). The air supply outlet 12 provided at the other end of the air supply passage 3 is exposed to the indoor space 20 directly or through an appropriate duct (not shown). Then, the air supply outlet 1 of the air supply passage 3
An air supply fan 7 is provided at a position closer to the second position.

The main exhaust passage 4 has an exhaust introduction port 13 provided at one end thereof directly or in an appropriate duct (not shown).
It is exposed to the indoor space 20 through. Further, an exhaust air outlet 14 provided at the other end of the main exhaust passage 4
Are exposed to the outside directly or through an appropriate duct (not shown). Then, the above exhaust outlet 14 near the position of the main exhaust passage 4, an exhaust fan 8 is provided. Further, the exhaust introduction port 13 is provided with the damper 9
(Corresponding to "switching means" in the claims), the main exhaust passage 4 and the sub-exhaust passage 5 can be selectively communicated with each other, and the damper 9 of the main exhaust passage 4 can be connected. Self-calibration CO ₂
A sensor 15 is provided.

Further, a total heat exchanger 10 is arranged between the air supply passage 3 and the main exhaust passage 4 so as to extend over both of them, and the air supply side of the total heat exchanger 10 is provided. Passage part 10
Heat is recovered by heat exchange between the supply air passing through A and the exhaust air passing through the exhaust side passage portion 10B.

The damper 9 communicates the exhaust introduction port 13 with the main exhaust passage 4 at the first position shown by the solid line in FIG. 2, and the exhaust introduction port at the second position shown by the broken line. 13 is communicated with the auxiliary exhaust passage 5.

Next, the operation of the ventilation device 1 will be described. Note that FIG. 2 shows an operation mode at the end of the normal ventilation operation.

A: Normal ventilation operation In the normal ventilation operation, "total heat ventilation" and "normal ventilation" are selected.

Ventilation operation by "total heat ventilation" is performed by operating both the air supply fan 7 and the exhaust fan 8 in the forward rotation direction with the damper 9 set to the first position. Be seen. In this “total heat ventilation”, the atmosphere is introduced from the outside as an air supply into the indoor space 20 through the air supply passage 3 by the air supply fan 7 while the exhaust fan 8 passes through the main exhaust passage 4 by the exhaust fan 8. The indoor air in the indoor space 20 is exhausted to the outside as exhaust air, and heat exchange is performed between the supply air on the air supply passage 3 side and the exhaust air on the main exhaust passage 4 side. The operation control of "total heat ventilation" is performed by controlling the air volume of the air supply fan 7 and the exhaust fan 8 based on the CO ₂ concentration in the exhaust gas detected by the CO ₂ sensor 15.

In the ventilation operation by "normal ventilation", the damper 9 is set to the second position, and the exhaust fan 8 is used.
This is performed by operating only the air supply fan 7 with the operation of No. 2 stopped. Therefore, the CO ₂ sensor 15 does not function in this "normal ventilation".

[0045] B: Operation for self-calibration operation the CO ₂ sensor 15 for self-calibration of the CO ₂ sensor 15, at the end of the normal ventilation operation, for example, the indoor space 20 finishing daytime business This is performed when the "total heat ventilation" or the "normal ventilation" of the ventilation device 1 is stopped due to the absence of a person, and corresponds to "operation at the end" in the claims.

In this operation at the end, as shown by the solid line in FIG. 2, the damper 9 is set to the first position and the main exhaust passage 4 is connected to the indoor space 2 via the exhaust introduction port 13.
It is performed in the state of facing 0.

First, as shown in FIG. 2, while the operation of the air supply fan 7 is stopped, only the exhaust fan 8 is operated at the maximum air volume for a predetermined time. By the maximum air volume operation of only the exhaust fan 8, the internal pressure of the indoor space 20 drops and becomes below atmospheric pressure. Next, after a lapse of a predetermined time,
The operation of the exhaust fan 8 is stopped. Then, since the upper Symbol interior space 20 is less than or equal to the negative pressure atmosphere, the pressure difference between the atmospheric pressure of the internal pressure and the outside of the indoor space 20,
The atmosphere is sucked into the indoor space 20 through the main exhaust passage 4. Then, the self-calibration line as this air sucked into the indoor space 20 side through the main exhaust passage 4 is in contact with an active part in the CO ₂ sensor 15, which the CO ₂ sensor 15 by the reference air density level That is, the detection accuracy is restored, and as a result, the control accuracy by the CO ₂ sensor 15 during the "total heat ventilation" operation is improved. Moreover, in the operation at the end of this operation, the air supply fan 7 and the exhaust fan 8 originally provided for achieving the functions of the ventilation device 1 are installed without installing any dedicated member or the like. Since it is realized by using it, the cost of the ventilation device 1 does not increase. That is, in the ventilator 1 of this embodiment, it is possible to achieve both control accuracy of the ventilator 1 by realizing proper self-calibration of the CO ₂ sensor 15 and cost reduction of the ventilator 1.

Third Embodiment FIG. 3 shows a ventilation device 1 according to a third embodiment of the present invention. This ventilation device 1 is a ventilation mode in which heat is recovered between air supply and exhaust (hereinafter referred to as "total heat ventilation").
And a ventilation mode that does not perform such heat recovery (hereinafter referred to as “ordinary ventilation”), which is an air supply / exhaust type ventilation device. 3 and a main exhaust passage 4 are formed, and a sub-exhaust passage 5 is further provided on the side of the main exhaust passage 4.

The air supply passage 3 has an air supply inlet 11 provided at one end thereof which is exposed to the outside of the room either directly or through an appropriate duct (not shown). The air supply outlet 12 provided at the other end of the air supply passage 3 is exposed to the indoor space 20 directly or through an appropriate duct (not shown). Then, the air supply outlet 1 of the air supply passage 3
An air supply fan 7 is provided at a position closer to the second position.

The main exhaust passage 4 has an exhaust introduction port 13 provided at one end thereof directly or in an appropriate duct (not shown).
It is exposed to the indoor space 20 through. Further, an exhaust air outlet 14 provided at the other end of the main exhaust passage 4
Are exposed to the outside directly or through an appropriate duct (not shown). An exhaust fan 8 is provided near the exhaust outlet 14 of the main exhaust passage 4. Further, the exhaust introduction port 13 is provided with the damper 9
(Corresponding to "switching means" in the claims), the main exhaust passage 4 and the sub-exhaust passage 5 can be selectively communicated with each other, and the damper 9 of the main exhaust passage 4 can be connected. Self-calibration CO ₂
A sensor 15 is provided.

Further, a total heat exchanger 10 is arranged between the air supply passage 3 and the main exhaust passage 4 so as to extend over both of them, and the air supply side of the total heat exchanger 10 is arranged. Passage part 10
Heat is recovered by heat exchange between the supply air passing through A and the exhaust air passing through the exhaust side passage portion 10B.

The damper 9 communicates the exhaust introduction port 13 with the main exhaust passage 4 at the first position shown by the broken line in FIG. 3, and the exhaust introduction port at the second position shown by the solid line. 13 is communicated with the auxiliary exhaust passage 5.

Next, the operation of the ventilation device 1 will be described. Note that FIG. 3 shows an operation mode at the end of the normal ventilation operation.

A: Normal ventilation operation In normal ventilation operation, "total heat ventilation" and "normal ventilation" are selected.

Ventilation operation by "total heat ventilation" is performed by operating both the air supply fan 7 and the exhaust fan 8 in the forward rotation direction with the damper 9 set to the first position. Be seen. In this “total heat ventilation”, the atmosphere is introduced from the outside as an air supply into the indoor space 20 through the air supply passage 3 by the air supply fan 7 while the exhaust fan 8 passes through the main exhaust passage 4 by the exhaust fan 8. The indoor air in the indoor space 20 is exhausted to the outside as exhaust air, and heat exchange is performed between the supply air on the air supply passage 3 side and the exhaust air on the main exhaust passage 4 side. The operation control of "total heat ventilation" is performed by controlling the air volume of the air supply fan 7 and the exhaust fan 8 based on the CO ₂ concentration in the exhaust gas detected by the CO ₂ sensor 15.

In the ventilation operation by "normal ventilation", the damper 9 is set to the second position and the exhaust fan 8 is used.
This is performed by operating only the air supply fan 7 with the operation of No. 2 stopped. Therefore, the CO ₂ sensor 15 does not function in this "normal ventilation".

[0057] B: Operation for self-calibration operation the CO ₂ sensor 15 for self-calibration of the CO ₂ sensor 15, at the end of the normal ventilation operation, for example, the indoor space 20 finishing daytime business This is performed after the person is absent and the "total heat ventilation" or the "normal ventilation" of the ventilation device 1 is stopped, and corresponds to "operation at the end" in the claims.

The operation at the end of this operation is as shown in FIG.
The damper 9 is set to the first position, and the main exhaust passage 4 is exposed to the indoor space 20 via the exhaust introduction port 13. If it explained based on the flowchart shown the operation of this end in FIG. 4 as follows.

That is, first, in step S1, a counter "Ca" for counting the number of basic operations at the end is set, and further in step S2,
A timer "Ta" that defines the operating time of the air supply fan 7 is set. Then, the air supply fan 7 is operated at the maximum air volume for the time "Ta" (steps S3 and S4). After a lapse of a predetermined time, a timer "Tb" that defines the stop time of the air supply fan 7 is set (step S5),
The operation of the air supply fan 7 is stopped. The cycle from the start to the stop of the supply fan 7 is the basic operation cycle of the operation at the end.

Then, this basic operation cycle is repeatedly executed a plurality of times at intervals of time "Tb", that is, until the cycle execution number "C" reaches the preset count "Ca" (steps S8-step). S
9).

When the basic operation cycle is repeated in this manner, as shown in FIG. 3 , only the supply fan 7 is operated so that the atmosphere is introduced into the indoor space 20 through the supply passage 3. The interior space 20 is in a positive pressure state higher than atmospheric pressure. However, the atmosphere introduced into the indoor space 20 does not pass through the main exhaust passage 4 because the exhaust introduction port 13 communicates with the auxiliary exhaust passage 5 by the switching means 9. It is discharged to the outside through the passage 5.

On the other hand, when the operation of the air supply fan 7 is stopped after the time "Ta" is continued in each basic operation cycle, the air supply fan 7 is stopped every time the operation of the air supply fan 7 is stopped. The atmosphere on the upstream side (suction side) of the fan 7 is compressed by its flow inertia and its pressure instantaneously rises above atmospheric pressure, and the internal pressure of the air supply passage 3 is higher than the internal pressure of the main exhaust passage 4. Get higher As a result, the differential pressure between the air supply passage 3 and the main exhaust passage 4 causes a leak flow of air in the total heat exchanger 10 from the air supply passage 3 side toward the main exhaust passage 4 side. This leaked air is supplied to the side of the CO ₂ sensor 15 and comes into contact therewith, whereby the CO ₂ sensor 1
The self-calibration of 5 is properly performed with the atmospheric concentration level of CO ₂ as a reference, the detection accuracy is restored, and as a result, the control accuracy by the CO ₂ sensor 15 at the time of "total heat ventilation" operation is improved. Is. Moreover, the operation at the end of this operation is a self-calibration operation by using the air supply fan 7 originally provided for achieving the function of the ventilation device 1 without installing any dedicated member or the like. Therefore, the cost of the ventilation device 1 does not increase. That is, in the ventilator 1 of this embodiment, it is possible to achieve both control accuracy of the ventilator 1 by realizing proper self-calibration of the CO ₂ sensor 15 and cost reduction of the ventilator 1.

[Brief description of drawings]

FIG. 1 is an operation explanatory view of a ventilation device according to a first embodiment of the present invention.

FIG. 2 shows a ventilation device according to a second embodiment of the present invention.
It is a work dynamic state diagram.

FIG. 3 is an operation explanatory view of a ventilation device according to a third embodiment of the present invention.

4 is a control flowchart of the ventilator shown in Fig.

[Explanation of symbols]

1 is a ventilation device, 2 is a casing, 3 is an air supply passage, 4 is a main exhaust passage, 5 is a sub exhaust passage, 6 is a partition wall, 7 is an air supply fan, 8 is an exhaust fan, 9 is a damper, 10 is Total heat exchanger, 11 is air supply inlet, 12 is air supply outlet, 13 is exhaust inlet, 14 is exhaust outlet, 15 is CO ₂ sensor, 20
Is an indoor space.

Claims (3)

(57) [Claims] 1. An interior space (20) comprising an air supply passage (3) for introducing air into the indoor space (20) as an air supply, and an exhaust fan (8). And an exhaust passage (4) for exhausting indoor air as an exhaust to the outside of the room, while a total heat exchanger (10) is arranged across the air supply passage (3) and the exhaust passage (4). together occupy performed heat exchange between the exhaust and air supply, and to the exhaust passage (4) is a ventilation apparatus having a CO ₂ sensor (15), at the end of the normal ventilation operation, the air supply Fan (7) and exhaust
Operate the air fan (8) together with the maximum air volume,
An air supply outlet of the air supply passage (3) in the inner space (20)
From (12) to the exhaust inlet (13) of the exhaust passage (4)
A ventilator characterized by supplying air supply to the CO ₂ sensor (15) part by generating an air flow toward . 2. An air supply is provided with a fan (7) for air supply.
And the air supply passageway (3) that is introduced into the indoor space (20)
A room in the above-mentioned indoor space (20) equipped with an air fan (8)
Equipped with an exhaust passage (4) that exhausts air as exhaust air to the outside
On the other hand, between the air supply passage (3) and the exhaust passage (4)
A total heat exchanger (10) is placed across the space between the air supply and the exhaust.
Heat exchange in the exhaust passage (4)
Is a ventilation device equipped with a CO ₂ sensor (15), and when the normal ventilation operation is completed, only the exhaust fan (8) is operated for a predetermined time while the operation of the air supply fan (7) is stopped. The exhaust fan (8) which has been operated and has passed the predetermined time.
Ventilation device comprising a benzalkonium stops the operation of the. 3. A supply fan (7) is provided for supplying air to the atmosphere.
And the air supply passageway (3) that is introduced into the indoor space (20)
A room in the above-mentioned indoor space (20) equipped with an air fan (8)
A main exhaust passage (4) for exhausting air to the outside as an exhaust air;
The indoor air in the indoor space (20) is exhausted to the outside.
And an auxiliary exhaust passage (5) for discharging the main exhaust gas.
Both of these are provided between the air passage (4) and the auxiliary exhaust passage (5).
Means for selectively communicating with the indoor space (20)
While being provided with (9), it straddles between the air supply passage (3) and the main exhaust passage (4).
A total heat exchanger (10) is installed to exchange heat between the air supply and the exhaust.
The exhaust passage (4) is replaced with CO
A ventilator provided with _two sensors (15), in a state where the auxiliary exhaust passage (5) is communicated with the indoor space (20) by the switching means (9) at the end of a normal ventilation operation , that is operated by the exhaust fan (8) the air supply fan (7) while stopping the operation of only the predetermined time is at the end of the basic operating cycle, the the basic operation cycle a plurality of times repeatedly score Ventilation device characterized by.