JP5111002B2 - Heat exchange ventilator - Google Patents

Description

  The present invention relates to a heat exchange ventilator that includes two blowers driven by a DC motor and performs heat exchange by simultaneous supply and exhaust via a heat exchanger.

  Conventionally, a supply air blower housed in a casing and driven by an air supply motor sucks outdoor air from the outdoor air intake port, and supplies the air from the indoor air outlet through the air supply passage of the air supply filter and heat exchanger into the room. An air passage, an exhaust passage that is driven by an exhaust motor, sucks room air from an indoor suction port, and exhausts the air from an outdoor outlet through the exhaust passage of the exhaust filter and the heat exchanger; and the air supply motor A bypass air supply passage that sucks outdoor air from the outdoor suction port by an air supply blower driven by the air supply, bypasses the air supply passage of the air supply filter and the heat exchanger, and supplies air into the room from the indoor side outlet The indoor air is sucked from the indoor suction port by an exhaust blower driven by the exhaust motor, bypassing the exhaust passage of the exhaust filter and the heat exchanger, There is a heat exchange ventilator that includes a bypass exhaust passage for exhausting the outdoor, (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 05-093536

  However, according to the above-described conventional technique, the air supply and exhaust filters are clogged by long-term operation, and the air path resistance of the air supply path and the exhaust path increases. Therefore, there has been a problem that the supply air and exhaust air volume are reduced.

  Further, an imbalance occurs in the degree of clogging of the air supply and exhaust filter, and an imbalance occurs in the air supply and exhaust air volume. For this reason, there has been a problem that the indoor pressure becomes a negative pressure or a positive pressure to generate a gap air.

  Furthermore, the heat exchange ventilation and the bypass ventilation have a problem that the actual air flow is different even if the set air flow is the same due to the difference in the air flow resistance between the air supply / exhaust passage and the bypass air supply / exhaust passage. .

  The present invention has been made in view of the above, and even if the air supply / exhaust filter is clogged, the air supply / exhaust air volume does not decrease, and there is an imbalance in the degree of clogging of the air supply / exhaust filter. Even if it occurs, there will be no imbalance between the air supply and exhaust airflow, and the set airflow and actual airflow will differ due to differences in airflow resistance between the air supply and exhaust passage and the bypass air supply and exhaust passage. The purpose is to obtain a heat exchange ventilator without air.

In order to solve the above-described problems and achieve the object, the present invention sucks outdoor air from an outdoor suction port by an air supply fan driven by an air supply DC motor, and supplies an air supply passage for an air supply filter and a heat exchanger. Through an air supply passage for supplying air into the room from the indoor air outlet and an air blower driven by an exhaust DC motor, the indoor air is sucked from the indoor air inlet, and the air outlet through the exhaust filter and the exhaust passage of the heat exchanger. an exhaust passage for exhausting the outdoor from, but a heat exchange ventilator to be stored in the casing, the air supply, air supply supplies each sine wave approximation pulse voltage to the exhaust DC motor, an exhaust motor drive means, said Supply air, exhaust DC motor air supply, exhaust motor rotation speed detection means for detecting and outputting the exhaust motor rotation speed, exhaust motor rotation speed detection means, and supply air, exhaust DC motor supply air, and exhaust motor current values are detected. Supply air and exhaust motor current detection means, air volume setting means for setting and outputting a common target air volume for the air supply path and the exhaust path, and the input air supply, exhaust motor rotation speed, air supply, exhaust Based on the motor current value and the common target air volume, the sine wave approximate pulse voltage output of each of the air supply and exhaust motor driving means is controlled so that the air volume of the air supply path and the exhaust path becomes the common target air volume, respectively. A control unit that performs a substantially proportional relationship between a product value of each of the air supply and exhaust motor rotation speeds and each of the air supply and exhaust motor current values, and an air volume of each of the air supply and exhaust passages. In the heat exchange ventilator in which the proportionality constant is substantially constant regardless of the magnitude of the air path resistance due to the supply air, clogging of the exhaust filter, etc., the control unit includes the supply motor rotation speed and the supply motor current. Product value and the exhaust motor speed The value of the product of the number and the exhaust motor current value, so that the composed value of the common target air volume and substantially the same, and controls the air supply, sine wave approximation pulse voltage output of the exhaust motor driving means respectively .

  According to the present invention, even if the air supply / exhaust filter is clogged, the air supply / exhaust air volume does not decrease, and even if an imbalance occurs in the degree of clogging of the air supply / exhaust filter, the air supply / exhaust air volume is reduced. It is possible to obtain a heat exchange ventilator that does not cause imbalance.

  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 FIG. 1 is a perspective view showing an embodiment of a heat exchange ventilator according to the present invention, FIG. 2 is a perspective plan view, FIG. 3 is a perspective side view, and FIG. FIG. 5 is a block diagram of the blower control device, FIG. 5 is a characteristic diagram of the product of the air supply and exhaust motor rotation speed and the motor current value, and the air volume of the air supply and exhaust passages, and FIG. It is a control flowchart of the control apparatus of an air blower.

  As shown in FIGS. 1 to 3, in the heat exchange ventilator 100, a heat exchanger 1 that performs heat exchange between outdoor air and room air is installed in a main body casing 2 that is formed in a rectangular parallelepiped box shape. Ventilate the room while exchanging heat by supplying and exhausting air.

  The heat exchange ventilator 100 sucks outdoor air from the outdoor air inlet 26 by the air supply blower 5 and supplies the air from the indoor air outlet 27 to the room through the air supply passage 1a (see FIG. 3) of the heat exchanger 1. An air supply path 4, an exhaust path 6 that sucks room air from the indoor air inlet 24 by the exhaust blower 3, and exhausts the air from the outdoor air outlet 25 through the exhaust passage 1 b (see FIG. 3) of the heat exchanger 1. Is formed. An air supply filter 4a is installed at the inlet of the air supply passage 1a, and an exhaust filter 6b is installed at the inlet of the exhaust passage 1b.

  The heat exchanger 1, the air supply fan 5 and the exhaust air fan 3 are assembled in the main body casing 2, and the air supply path part 12 and the exhaust path part 11 are mounted, whereby the air supply path 4 and the exhaust path 6 are formed. The

  The air supply path 4 uses the opening of the main casing 2 corresponding to the inlet portion 15 of the exhaust passage component 11 as an outdoor suction port 26, and supplies air from the inlet portion 15 of the exhaust passage component 11 from the upper surface of the heat exchanger 1. The air filter 4a and the air supply passage 1a of the heat exchanger 1 are passed from the air supply blower 5 to the outlet portion 14 of the air supply path component 12, and the opening of the main casing 2 corresponding to the opening of the outlet portion 14 is located on the indoor side. It is formed as a ventilation path that serves as the air outlet 27.

  On the other hand, in the exhaust path 6, the opening portion of the main body casing 2 corresponding to the inlet portion 15 of the air supply path component 12 is used as the indoor suction port 24, and the inlet portion 15 of the air supply path component 12 is positioned above the heat exchanger 1. From the surface through the exhaust filter 6b and the exhaust passage 1b of the heat exchanger 1, the exhaust blower 3 leads to the outlet portion 14 of the exhaust passage component 11, and the opening of the main casing 2 corresponding to the opening of the outlet portion 14 is blown to the outdoor side. It is formed as a ventilating passage for the outlet 25.

  Further, the bypass air supply path 10 bypasses the heat exchanger 1 from the outdoor inlet 26 of the air supply path 4 through the inlet portion 15 of the exhaust path part 11 by opening the bypass damper 9 and supplies the air supply path part 12. Is formed as a ventilation path for supplying outdoor air from the outlet portion 14 to the indoor outlet 27.

  Although not shown in the figure, the bypass exhaust passage bypasses the heat exchanger 1 from the indoor intake port 24 of the exhaust passage 6 through the inlet portion 15 of the air supply passage component 12 by opening the bypass damper. 11 is formed as a ventilation path for exhausting room air from the outlet portion 14 to the outdoor air outlet 25.

  A duct connecting cylinder 16 is attached to the outdoor side inlet 26 and the indoor side outlet 27 of the air supply path 4 and the indoor side inlet 24 and the outdoor side outlet 25 of the exhaust path 6.

  The heat exchange ventilator 100 supplies outdoor air to the room through the heat exchanger 1 through the air supply path 4, and simultaneously exhausts the room air to the outside through the heat exchanger 1 through the exhaust path 6. Perform heat exchange ventilation by simultaneous supply and exhaust while performing heat exchange.

  Further, by opening the bypass air supply passage 10 or the bypass exhaust passage with a damper, the supply air blower 5 or the exhaust air blower 3 supplies outdoor air and indoor air without passing through the exhaust filters 4a and 6b and the heat exchanger 1. In addition, air can be supplied and exhausted indoors and indoors, and normal ventilation without heat exchange can also be performed.

  The blower casing portion 13 and the outlet portion 14 of the exhaust path component 11 communicate with each other as an exhaust path. The outlet part 14 opens in two directions perpendicular to the direction of air blowing from the blower casing part 13, and the branch part of the outlet part 14 has an outdoor outlet of the exhaust passage 6 as shown in FIG. 2. A damper plate 7 is provided so that the exhaust passage opening area of the 25 two-way openings can be adjusted.

  The damper plate 7 rotates about a damper shaft (not shown), thereby reducing the exhaust passage opening area of the one-way opening of the two directions in which the outdoor air outlet 25 of the exhaust passage 6 is open. At the same time, the exhaust passage opening area of the opening in the other direction is enlarged.

  The blower casing portion 13 and the outlet portion 14 of the air supply path component 12 communicate with each other as an exhaust path. The outlet portion 14 is opened in two directions perpendicular to the direction of air blowing from the blower casing portion 13 and the branch portion of the outlet portion 14 is blown to the indoor side of the air supply path 4 as shown in FIG. A damper plate 8 is provided so that the exhaust passage opening area of the two outlet openings 27 can be adjusted.

  The damper plate 8 rotates about a damper shaft (not shown), so that the air supply path opening area of one direction of the two air openings 27 in the air supply path 4 is opened. While reducing, the air supply path opening area of the opening of another direction is expanded.

  FIG. 4 is a block diagram of the blower control device, FIG. 5 is a characteristic diagram of the product of the air supply / exhaust DC motor rotation speed and the motor current value, the air supply, and the air flow rate of the exhaust passage. It is a control flowchart of the control apparatus of an air blower.

As shown in FIG. 4, the blower control device 200 includes an air supply, an air supply that drives the exhaust air blowers 5 and 3, an exhaust three-phase DC brushless motor (supply and exhaust DC motor) 22 and 23, an air supply, Supply air and exhaust motor driving means 22a and 23a for supplying a sinusoidal approximate pulse voltage to the exhaust three-phase DC brushless motors 22 and 23, supply air, supply of the exhaust three-phase DC brushless motors 22 and 23, and exhaust motor rotation The air supply and exhaust motor rotation speed detecting means 22c and 23c for detecting and outputting the numbers N ₂₂ and N ₂₃ , the air supply, the air supply for the exhaust three-phase DC brushless motors 22 and 23, the exhaust motor current value I ₂₂ , supply of outputting the I ₂₃ respectively detect and includes an exhaust motor current detecting means 22b, and 23b, the air supply, the air volume setting means 31 for setting the output common target air quantity Q of the exhaust passage 4 and 6, the.

As shown in FIG. 5, the air supply, the air supply driving the exhaust blowers 5, 3, and the exhaust three-phase DC brushless motors 22, 23 supply the air and the exhaust motor rotation speeds N ₂₂ and N ₂₃ , respectively. The product values NI ₂₂ and NI _{23 of the} exhaust motor current values I ₂₂ and I ₂₃ , respectively, and the air volumes Q ₂₂ and Q ₂₃ of the air supply and exhaust passages 4 and 6 are substantially proportional to each other. Further, the proportionality constant is substantially constant regardless of the magnitude of the air path resistance due to air supply, clogging of the exhaust filters 4a, 6b, etc., and the air volume Q ₂₂ is controlled by controlling the product values NI ₂₂ and NI ₂₃ , respectively. , Q ₂₃ can be controlled.

To increase or decrease the air volume _{Q 22, Q 23} may be increased or decreased value _NI 22, _{NI 23} product, to increase or decrease the value _NI 22, _{NI 23} product is, air supply, an exhaust motor drive unit 22a, What is necessary is just to change the supply voltage to the air supply by 23a, the exhaust 3 phase DC brushless motors 22 and 23.

Control unit 30 of the control unit 200 (see FIG. 4) is the product of the value _{NI 22} of the air supply motor rotational speed _{N 22} input air supply motor current value _{I 22,} and the exhaust and the exhaust motor speed _{N 23} motor product of the values NI ₂₃ of current I ₂₃ is, so that substantially the same as the common target air quantity Q inputted from the air volume setting means 31, air supply, an exhaust motor driving means 22a, 23a of each of the sine wave approximation pulse voltage The outputs V ₂₂ and V ₂₃ are controlled.

Next, with reference to FIG. 6, the control method of the sine wave approximate pulse voltage outputs V ₂₂ and V ₂₃ of the air supply and exhaust motor driving means 22a and 23a by the control unit 30 of the control device 200 will be described. First, in step S <b> 10, it is determined whether an operation stop signal is input to the control unit 30. If YES, the process proceeds to step S12, and the air supply and exhaust motor drive means 22a and 23a are turned off.

  If NO, the process proceeds to step S14 and the common target air volume value Q input from the air volume setting means 31 is confirmed. Next, it progresses to step S16 and it is judged whether the heat exchange ventilation apparatus 100 is set to the heat exchange ventilation mode. If it is YES, it will progress to step S18 and will set the common target air volume Q at the time of heat exchange ventilation as a control target. If NO, the process proceeds to step S20, and the bypass common target air volume Qb is set as a control target.

Next, the process proceeds to step S30, in which it is determined whether or not the product value NI _{22 of} the supply motor rotation speed N ₂₂ and the supply motor current value I ₂₂ is substantially the same as the common target air volume Q (Qb). If YES, the process proceeds to step S32, determines whether the abnormality is not whether the air supply motor rotational speed _{N 22} and the air supply motor current value _{I 22} (limit low rotational speed Ns _{<N 22} <limit high rotational speed Nr And, if the limit low current Is <I ₂₂ <limit high current Ir, YES, otherwise NO).

If NO, the process proceeds to step S12, and the air supply and exhaust motor drive means 22a, 23a are turned off. If YES, the process proceeds to step S34, to maintain the current sine wave approximation pulse voltage output _{V 22} of the air supply motor drive unit 22a.

If the determination in step S30 is NO, the process proceeds to step S36, and whether or not the product value NI _{22 of} the supply motor rotation speed N ₂₂ and the supply motor current value I ₂₂ is smaller than the common target air flow rate Q (Qb). Determine. If YES, the process proceeds to step S38, the process returns to step S30 sine wave approximation pulse voltage output _{V 22} of the air supply motor drive unit 22a by a predetermined amount UP, if NO, the process proceeds to step S39, air supply motor drive returning to step S30 sine wave approximation pulse voltage output _{V 22} of the means 22a by a predetermined amount DOWN, until the step S30 is YES, a step S30～S38, repeated S39.

Proceed to the next step S34 to step S40, the product of the value _{NI 23} of the exhaust motor rotational speed _{N 23} and the exhaust motor current value _{I 23} is equal to or substantially the same as the common target airflow Q (Qb). If YES, the process proceeds to step S42, the exhaust motor speed _{N 23} and determines whether the abnormality is not whether the air supply motor current value _{I 23} (limit low rotational speed Ns _{<N 23} <limit high rotational speed Nr, And if the limit low current Is <I ₂₃ <the limit high current Ir, YES, otherwise NO).

If NO, the process proceeds to step S12, and the air supply and exhaust motor drive means 22a, 23a are turned off. If YES, the process proceeds to step S44, to maintain the current sine wave approximation pulse voltage output _{V 23} of the air supply motor drive unit 23a.

If the determination of step S40 is NO, the process proceeds to step S46, determines that the exhaust motor rotational speed _{N 23} product of the values _{NI 23} of the exhaust motor current value _{I 23} is, whether the common target airflow Q (Qb) is less than To do. If YES, the process proceeds to step S48, the process returns to step S40 sine wave approximation pulse voltage output _{V 23} of the exhaust motor drive unit 23a by a predetermined amount UP, if NO, the process proceeds to step S49, the exhaust motor drive unit 23a return the sine wave approximation pulse voltage output _{V 23} in step S40 by a predetermined amount DOWN, until the step S40 is YES, a step S40～S48, repeated S49.

Returns to the next step S44 to step S10, thereafter repeating the step S10~ step S44, air supply, and controls the discharge motor driving means 22a, 23a sine wave approximation of each pulse voltage output _{V 22, V 23.}

As described above, according to the heat exchange ventilator 100 of the embodiment, the air supply, exhaust filter 4a, supply air even 6b is clogged, the exhaust air volume Q _22, Q ₂₃ is not reduced, the air supply , exhaust filter 4a, even if unbalance in the degree of clogging of 6b, the air supply, exhaust air volume _{Q 22, Q} without imbalance occurs in _23, further air supply, an exhaust passage 4 and 6, Due to the difference in airflow resistance between the bypass air supply and the exhaust airway, the actual airflow will not differ even if the set airflow is the same.

  As described above, the heat exchange ventilator according to the present invention is useful as a device installed in a place where there is a lot of dust.

It is a see-through | perspective perspective view which shows embodiment of the heat exchange ventilation apparatus concerning this invention. It is a perspective top view of the heat exchange ventilation apparatus of an embodiment. It is a see-through | perspective side view of the heat exchange ventilation apparatus of embodiment. It is a block block diagram of the control apparatus of an air blower. It is a characteristic figure of the value of the product of a motor rotation speed and an electric current value, air supply, and the air volume of an exhaust path. It is a control flowchart of the control apparatus of an air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 1a Air supply path 1b Exhaust path 4a Air supply filter 6b Exhaust filter 2 Main body casing (casing)
DESCRIPTION OF SYMBOLS 3 Exhaust air blower 4 Air supply path 5 Supply air blower 6 Exhaust path 7 Damper board 8 Damper board 9 Bypass damper 10 Bypass air supply path 11 Exhaust path part 12 Supply air path part 13 Blower casing part 14 Outlet part 15 Inlet part 16 Duct connection Tube 22, 23 Supply / exhaust 3-phase DC brushless motor (supply / exhaust DC motor)
22a, 23a Air supply / exhaust motor drive means 22b, 23b Air supply / exhaust motor current detection means 22c, 23c Air supply / exhaust motor rotation speed detection means 24 Indoor air inlet 25 Outdoor air outlet 26 Outdoor air inlet 27 Chamber Inner outlet 30 Control unit 31 Air volume setting means 100 Heat exchange ventilator 200 Controller

Claims (2)

An air supply path that sucks outdoor air from the outdoor air inlet by an air supply fan driven by an air supply DC motor, and supplies the air from the indoor side outlet to the room through the air supply passage of the air supply filter and the heat exchanger;
The heat stored in the casing is exhausted from the outdoor outlet through the exhaust filter and the exhaust passage of the heat exchanger through the exhaust passage of the exhaust filter and the heat exchanger. an exchange ventilator,
An air supply and exhaust motor driving means for supplying a sinusoidal approximate pulse voltage to each of the air supply and exhaust DC motors;
The supply air, the supply air of the exhaust DC motor, the supply air that detects and outputs the exhaust motor rotation speed, and the exhaust motor rotation speed detection means;
An air supply and exhaust motor current detecting means for detecting and outputting the air supply, the exhaust DC motor supply, and the exhaust motor current value, respectively;
An air volume setting means for setting and outputting a common target air volume for the air supply path and the exhaust path;
Based on the input air supply, exhaust motor speed, supply air, exhaust motor current value, and common target air volume, the air supply path and exhaust path air volume respectively become the common target air volume. A control unit for controlling the sine wave approximate pulse voltage output of each of the air and exhaust motor driving means;
A value of a product of each of the air supply and exhaust motor rotation speeds and each of the air supply and exhaust motor current values is substantially proportional to an air volume of each of the air supply and exhaust paths, and the air supply In a heat exchange ventilator where the proportionality constant is substantially constant regardless of the magnitude of the wind path resistance due to clogging of the exhaust filter, etc.
The control unit is configured such that a product value of the supply motor rotation speed and the supply motor current value and a product value of the exhaust motor rotation speed and the exhaust motor current value are substantially the same as the common target airflow value. In addition, a heat exchange ventilator for controlling the sinusoidal approximate pulse voltage output of each of the air supply and exhaust motor driving means . The supply air blower driven by the supply air DC motor sucks outdoor air from the outdoor suction port, and supplies air into the room from the indoor side air outlet, bypassing the air supply passage of the air supply filter and the heat exchanger. A bypass airway,
A bypass exhaust passage that sucks room air from the indoor side suction port by an exhaust blower driven by the exhaust DC motor, bypasses the exhaust passage of the exhaust air filter and the heat exchanger, and exhausts the outdoor air from the outdoor outlet. ,
Further comprising
The controller includes a bypass common target air volume in which a product value of the supply motor rotation speed and the supply motor current value and a product value of the exhaust motor rotation speed and the exhaust motor current value are input from the air volume setting unit. 2. The heat exchange ventilator according to claim 1, wherein the sine wave approximate pulse voltage output of each of the air supply and exhaust motor driving means is controlled so as to be substantially the same as the value of the air supply.

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