KR100992880B1 - Apparatus capable of protecting driving motor followed by detecting head wind for ventilation system and method thereof - Google Patents

Abstract

According to the present invention, the air supply duct 10 for supplying the outdoor air to the living space by the air supply fan 11, the filter 20 for filtering the contaminants of the outdoor air is provided in the interior of the air supply duct 10, Exhaust duct 30 for exhausting indoor air in the residential space by the exhaust fan 31 to the outside, and is provided on the outdoor side of the exhaust duct 30 by the hydraulic pressure of the indoor air exhausted by the exhaust fan 31. A ventilation system including an exhaust damper 40 which is unidirectionally opened and closed, and a heat exchanger 50 for exchanging indoor air with outdoor air supplied / exhausted by the air supply fan 11 and the air exhaust fan 31, the exhaust fan ( An input unit 120 for setting a fixed rotational speed of the driving motor 110 to rotate 31; A power supply unit 130 supplying an operating voltage (or operating current) corresponding to the fixed rotational speed of the driving motor 110; The rotation speed of detecting the reverse wind by measuring the rotation speed of the driving motor 110 that is variable (increased) by the pressure (or strength) of the back wind supplied to the exhaust duct 30 and determining whether or not it is similar to the fixed rotation speed. Measuring unit 140; When the rotation speed measured by the rotation speed measurement unit 140 and the fixed rotation speed are not similar, the operating voltage of the power supply unit 130 such that the driving motor 110 has the measurement rotation speed corresponding to the fixed rotation speed ( Or a feedback unit 150 for feeding back a reduced operating current); And detecting an operating voltage (or an operating current) of the driving motor 110 fed back in a reduced state by the feedback unit 150 to correspond to the temporary stop of the driving motor 110 preset by the input unit 120. The driving motor protection unit 160 to stop the operation of the driving motor 110 for a predetermined time when the pressure of the counter-wind is greater than the rotational force of the driving motor 110 by determining whether it corresponds to the reference voltage (or reference current). Provided is a driving motor protection device according to a backwind of a ventilation system including.

Ventilation system, air supply, exhaust, blowing fan, drive motor, operating voltage, current, rotation speed, air conditioner, filter, exchange

Description

Apparatus capable of protecting driving motor followed by detecting head wind for ventilation system and method

The present invention relates to a ventilation system, and more particularly, to determine whether a backwind is generated in an exhaust duct of a ventilation system and determining a feedback operating voltage corresponding to a fixed rotational speed of a driving motor according to the pressure of the backwind. The present invention relates to a driving motor protection device and a method according to the reverse wind of the ventilation system that can implement a smooth operation.

In general, the ventilation system is provided in apartment houses to remove dust, bacteria, and odors in the air to clean the air.A plurality of dusts and odors contained in the outdoor air sucked in accordance with the operation of the air circulation fan are provided. Purified by passing through the filter of the purified air is discharged back to the room to purify the indoor air, the indoor air discharged by the operation of the air circulation exhaust fan is forcibly discharged to the outside.

However, although the air supply performance of the ventilation system is improved due to the increase in the wind pressure due to the higher floor of the multi-unit house provided with the ventilation system as described above, there is a problem in that the exhaust performance decreases due to the back wind caused by the increase in the wind pressure.

Therefore, a method for improving the exhaust performance due to the backwind of the ventilation system has been disclosed in Republic of Korea Patent Publication No. 10-1996-38304.

According to the wind pressure detection method of the gas boiler by the exhaust fan rotation speed and the salt voltage disclosed in the above publication, instead of the wind pressure switch provided in the exhaust fan to sense the reverse wind flowing from the outside, the exhaust gas forcibly exhausted It detects the salt voltage generated in proportion to the fan's motor speed and the burner's combustion flame, and if the exhaust fan speed is lower than the reference speed and the salt voltage is higher than the reference salt voltage, the combustion of the boiler is stopped and the exhaust fan Rotation is continued, and the rotation speed of the exhaust fan is re-measured so that if the reference speed is normal combustion, the combustion is stopped.

Here, the conventional exhaust fan rotation speed and the wind pressure detection method of the gas boiler by the salt voltage assumes that the rotation speed of the exhaust fan is reduced by simply reducing the load applied to the exhaust fan when a reverse wind occurs.

However, although the exhaust fan is normally supplied with an operating voltage (or operating current) for rotating at a constant rotation speed, that is, a fixed rotation speed, in order to suppress the occurrence of noise, indoor air is exhausted to the outside by backwind. Since the amount applied to the exhaust fan is reduced, the rotational speed of the exhaust fan is reduced within the error range at the time of designing the exhaust fan rotational speed, for example, ± 5% of the fixed rpm (ex: 1800 ± 100 (rpm). Will increase by)).

Therefore, according to the conventional method of detecting the wind pressure of the gas boiler by the exhaust fan rotation speed and the salt voltage, if the operating voltage (or operating current) supplied to the exhaust fan is not reduced so that the exhaust fan is rotated by a fixed rotation speed, It is not possible to detect the increased rotation speed within the error range, that is, even if the exhaust fan is further rotated by the rotation speed within the error range is determined to have the same rotation speed.

Accordingly, if the operating voltage (or operating current) is not supplied to increase the rotational speed of the exhaust fan to maintain the predetermined rotational speed, there is a problem that the exhaust fan is excessively rotated and overheated or broken.

In addition, if the exact rotational speed of the over-rotating exhaust fan is not known, it is difficult to accurately measure the operating voltage (or operating current) supplied to the exhaust fan to operate at a fixed rotational speed. Reverse wind detection is inaccurate and there is a problem that the ventilation system is not operating smoothly.

Accordingly, an object of the present invention is to accurately detect the rotational speed of the exhaust fan (or the driving motor) that increases with the pressure of the reverse wind, and to operate the voltage corresponding to the fixed rotational speed so as to have a fixed rotational speed before the increased rotational speed ( Or it provides a drive motor protection device and method according to the reverse wind of the ventilation system to enable the operating current) to be fed back.

In addition, another object of the present invention is to measure the feedback operating voltage (or operating current) of the exhaust fan corresponding to the increase in the number of rotation of the exhaust fan backwind of the ventilation system that can detect the more accurate backwind to ensure a smooth exhaust It is to provide a drive motor protection apparatus and a method thereof.

In addition, another object of the present invention is that the feedback operating voltage of the drive motor for rotating the exhaust fan provided in the exhaust duct has a value less than the reference voltage which is a reference for determining the reverse wind, and at the same time or optionally provided in the air supply duct It is to provide a driving motor protection device and a method according to the backwind of the ventilation system that can determine that the backwind occurs when the feedback operating voltage of the drive motor for rotating the air supply fan has a value above the reference voltage.

To this end, according to the present invention, the air supply duct 10, the air supply duct 10 for supplying the outdoor air to the residential space by the air supply fan 11 is provided with a filter for filtering contaminants in the outdoor air ( 20), the exhaust duct 30 for exhausting the indoor air of the living space by the exhaust fan 31 to the outside, the indoor air exhausted by the exhaust fan 31 is provided on the outdoor side of the exhaust duct 30 In the ventilation system including an exhaust damper (40) unidirectionally opened and closed by the hydraulic pressure of the heat exchanger (50) and a heat exchanger (50) for heat-exchanging the indoor air and the outdoor air supplied and exhausted by the exhaust fan (31) An input unit 120 for setting a fixed rotational speed of the driving motor 110 for rotating the exhaust fan 31; A power supply unit 130 supplying an operating voltage (or operating current) corresponding to the fixed rotational speed of the driving motor 110; The rotation speed of detecting the reverse wind by measuring the rotation speed of the driving motor 110 that is variable (increased) by the pressure (or strength) of the back wind supplied to the exhaust duct 30 and determining whether or not it is similar to the fixed rotation speed. Measuring unit 140; When the rotation speed measured by the rotation speed measurement unit 140 and the fixed rotation speed are not similar, the operating voltage of the power supply unit 130 such that the driving motor 110 has the measurement rotation speed corresponding to the fixed rotation speed ( Or a feedback unit 150 for feeding back a reduced operating current); And detecting an operating voltage (or an operating current) of the driving motor 110 fed back in a reduced state by the feedback unit 150 to correspond to the temporary stop of the driving motor 110 preset by the input unit 120. And a driving motor protection unit 160 that stops the operation of the driving motor 110 for a predetermined time when the pressure of the counterwind is greater than the rotational force of the driving motor 110 by determining whether the corresponding reference voltage (or reference current) corresponds. The driving motor protection device according to the reverse wind of the ventilation system is provided.

In addition, according to the present invention, while the indoor air is exhausted to the exhaust duct 30 by the exhaust fan 31 rotated by the drive motor 110 of the exhaust damper 40 by the pressure of the reverse wind generated from the outside When the opening is not easy, and thus the amount of internal air exhausted in the exhaust duct 30 decreases so that the load applied to the driving motor 110 decreases, the rotation speed of the driving motor 110 is set to the fixed rotation speed. Drive motor protection due to the reverse wind of the ventilation system including the drive motor 110 is increased by the error range (± 5% of the fixed rpm) at the time of design despite the supply of an operating voltage (or operating current) to rotate as much as In the method, the driving motor 110 for rotating the exhaust fan 31 by the input unit 120 is set to have a fixed rotational speed and the driving motor 110 by the power supply unit 130 is set to the fixed rotational speed. Motion to rotate A first step of supplying a voltage Vsp; A second step of outputting the rotation speed of the driving motor 110 as a pulse signal by a hall sensor (not shown) of the rotation speed measurement unit 140; A third step in which the rotation speed measured by the rotation speed measurement unit 140 by the feedback unit 150 and the fixed rotation speed set by the input unit 120 are compared; When the measured rotational speed of the drive motor 110 is increased by the differential pressure according to the back wind pressure than the fixed rotational speed, the power supply so that the measured rotational speed of the drive motor 110 by the feedback unit 150 to correspond to the fixed rotational speed A fourth step in which the operating voltage Vsp of the supply unit 130 is down and the feedback operating voltage Vfd corresponding thereto is fed back to the driving motor 110; A fifth step of detecting a feedback operating voltage (or operating current) Vfd fed back by the driving motor protection unit 160 to the driving motor 110 by the feedback unit 150; And the feedback operating voltage Vfd is compared with the reference voltage (or reference current) Vref corresponding to the temporary stop of the driving motor 110 in which the detected feedback operating voltage Vfd is preset by the input unit 120. When the value of Vref or less, the driving motor protection method according to the reverse wind of the ventilation system including a sixth step of the operation of the driving motor 110 is stopped for a predetermined time by the drive motor protection unit 160 is provided.

Therefore, according to the present invention, the feedback operation voltage corresponding to the fixed rotational speed so as to accurately detect the rotational speed of the driving motor increases with the pressure of the counter-winding and the drive motor has a fixed rotational speed before the increased rotational speed ( Or the operating current) is fed back to prevent excessive rotation of the driving motor, thereby preventing overheating and damage.

In addition, by accurately detecting the operating voltage fed back so that the driving motor maintains a fixed rotation speed as the rotational speed of the driving motor increases and comparing it with a preset reference voltage, the exhaust damper cannot be completely opened due to the backwind pressure. It is determined that normal exhaustion is not possible due to the rotation of the motor, and through this, the operation of the driving motor may be stopped for a certain time to ensure smooth exhaustion.

In addition, the drive motor for rotating the air supply fan provided in the air supply duct has a value less than or equal to the reference voltage, which is a reference for determining the reverse wind, while the feedback operation voltage of the drive motor for rotating the exhaust fan provided in the exhaust duct. When it is determined that the feedback operating voltage has a value greater than or equal to the reference voltage, it is determined that the reverse wind occurs, thereby preventing the ventilation system from operating smoothly due to the incorrect reverse wind detection caused by the malfunction of the driving motor.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a driving motor protection device according to the reverse wind of the ventilation system according to a preferred embodiment of the present invention, Figure 2 is a side cross-sectional view showing a ventilation system to which the driving motor protection device according to the reverse wind of FIG. .

1 and 2, the driving motor protection device 100 according to the reverse wind of the ventilation system according to an embodiment of the present invention, the outdoor air is supplied to the living space by the air supply fan 11 An exhaust duct provided in the air supply duct 10 and the air supply duct 10 to filter contaminants of outdoor air and an exhaust fan 31 to exhaust indoor air in a residential space to the outside ( 30) the exhaust damper 40 and the air supply fan 11 which are provided at the outdoor side of the exhaust duct 30 and are opened and closed only in one direction (outside) by the hydraulic pressure of the indoor air exhausted by the exhaust fan 31; In a ventilation system including a heat exchanger (50) for exchanging outdoor air and indoor air supplied / exhaust by an exhaust fan (31), a fixed rotational speed of the drive motor (110) for rotating the exhaust fan (31) is Operating voltage (or operation) corresponding to the fixed rotation speed of the input unit 120 and the driving motor 110 to be set The rotational speed of the driving motor 110 which is variable (increased) by the power supply unit 130 supplying current) and the pressure (or intensity) of the backwind supplied to the exhaust duct 30 and measures the rotational speed When the rotation speed measured by the rotation speed measurement unit 140 and the rotation speed measurement unit 140 that detects the reverse wind by determining whether or not the similarity is not the same as the fixed rotation speed, the driving motor 110 is connected to the fixed rotation speed. The driving motor fed back in the reduced state by the feedback unit 150 and the feedback unit 150 to allow the operating voltage (or operating current) of the power supply unit 130 to be reduced so as to have a corresponding measurement rotation speed. Detects the operating voltage (or operating current) of the 110 to determine whether or not it corresponds to the reference voltage (or reference current) corresponding to the temporary stop of the driving motor 110 preset by the input unit 120 to determine whether the The pressure is greater than the rotational force of the drive motor 110 The operation of the right drive motor 110 and a predetermined time the drive motor protection unit 160 is stopped.

Here, the drive motor 110 is preferably a DC brushless motor (BLDC).

The input unit 120 sets a fixed rotation speed such that the driving motor 110 is always rotated at a constant rotation speed.

The power supply unit 130 may supply an operating voltage at which the driving motor 110 is rotated at the set fixed speed, for example, Vsp = 6V corresponding to a fixed speed of the set driving motor 110 at 1800 rpm. Supply. Here, the power supply unit 130 may supply an operating current corresponding to the operating voltage.

The rotation speed measuring unit 140 outputs a frequency generator (FG) for outputting the rotation speed of the driving motor 110 as a pulse signal through a hall sensor (not shown) provided at one side of the driving motor 110. Include.

Here, the exhaust damper 40 does not open easily due to the back wind pressure generated from the outside while the indoor air is exhausted to the exhaust duct 30 by the exhaust fan 31 rotated by the drive motor 110. Accordingly, when the amount of indoor air exhausted by the exhaust duct 30 decreases and the load applied to the driving motor 110 decreases, the rotation speed of the driving motor 110 is rotated by the set fixed rotation speed. Although the voltage (or operating current) is supplied, the error range at the time of design increases, for example, ± 5% of the fixed rpm (ex: 1800 ± 100 (rpm)).

Therefore, according to the rotation speed measuring unit 140, even if the measured rotation speed of the drive motor 110 is reduced to more than the fixed rotation speed due to the generation of the differential pressure in accordance with the pressure of the reverse wind can be accurately measured.

When the rotation speed measured by the rotation speed measurement unit 140 and the fixed rotation speed set by the input unit 120 are not the same, that is, the exhaust damper 40 may be caused by the differential pressure depending on the counter wind pressure. ) Is not easy to open and the amount of indoor air exhausted is reduced so that the measured rotational speed of the drive motor 110 is greater than the fixed rotational speed. The operating voltage Vsp of the power supply unit 130 is reduced so as to correspond to the feedback operation voltage Vfd corresponding to the feedback to the driving motor 110.

Here, the feedback operation voltage Vfd is preferably stored in advance to correspond to the fixed rotational speed of the drive motor 110.

For example, in a state in which the operating voltage at the fixed rotational speed of the drive motor 110 is 1800 rpm, Vsp = 6V, the air that is not easily opened due to the pressure of the counter-air of the outdoor air is not easily opened. If the load applied to the driving motor 110 decreases as the amount of Δ decreases, and the operating voltage at which the measured rotational speed is fixed again when the measurement rotational speed of the driving motor 110 is 1900 rpm is Vsp = 5V, the driving motor The feedback operation voltage Vfd = 5V corresponding to the operating voltage Vsp = 5V is fed back to 110. After that, when the operating speed of the driving motor 110 is 1870 rpm, when the operating voltage is Vsp = 4V, the feedback operating voltage corresponding to the operating voltage Vsp = 4V is applied to the driving motor 110. Vfd = 4V is fed back. After that, when the operating speed of the driving motor 110 is 1850 rpm and the operating voltage Vsp = 3V, the feedback operating voltage corresponding to the operating voltage Vsp = 3V is applied to the driving motor 110. Vfd = 3V is fed back.

Meanwhile, Vfd = 3V among the operating voltages fed back to the driving motor 110 through the input unit 120 may be set as a reference voltage Vref for temporarily stopping the operation of the driving motor 110. The voltage Vref preferably corresponds to the feedback operating voltage state when the exhaust damper 40 cannot be completely opened according to the pressure of the reverse wind, and thus normal exhaustion is not possible due to the rotation of the driving motor 110.

Therefore, according to the feedback unit 150, the operation voltage is lowered so that the measured rotational speed of the drive motor 110 is increased to correspond to the fixed rotational speed again due to the differential pressure generated by the pressure of the reverse wind drive motor 110 to the feedback operating voltage By being fed back, it is possible to prevent excessive rotation of the driving motor 110 to prevent overheating and damage.

The driving motor protection unit 160 detects a feedback operating voltage (or operating current) Vfd of the driving motor 110 fed back by the feedback unit 150, and sets the driving motor 110 in advance by the input unit 120. When the feedback operation voltage Vfd has a value less than or equal to the reference voltage Vref, the operation of the driving motor 110 is stopped for a predetermined time compared to the reference voltage (or reference current) Vref corresponding to the temporary operation stop timing.

That is, in the state where the reference voltage Vref set by the input unit 120 is set to correspond to Vfd = 3V among the operating voltages fed back down to the driving motor 110, the feedback down supply is supplied to the driving motor 110. When the voltage is Vfd = 3V, opening of the exhaust damper 40 is not completely possible due to the pressure of the reverse wind, and it is determined that normal exhaustion is impossible due to the rotation of the driving motor 110.

Therefore, according to the driving motor protection unit 160, by accurately detecting the operating voltage fed back so that the driving motor 110 maintains a fixed rotation speed according to the increase in the rotation speed of the driving motor 110 and compares it with a predetermined reference voltage When the feedback operation voltage has a value less than or equal to the reference voltage, the operation of the driving motor 110 may be stopped for a predetermined time to prevent excessive rotation or idling of the driving motor 110.

Hereinafter, with reference to the drawings will be described the operation and effect of the preferred embodiment of the present invention.

3 is a control flowchart illustrating a method of protecting a driving motor according to a reverse wind of a ventilation system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the driving motor protection method according to the reverse wind of the ventilation system according to the preferred embodiment of the present invention is as follows.

First, the driving motor 110 for rotating the exhaust fan 31 by the input unit 120 is set to have a fixed rotational speed, and the driving motor 110 by the power supply unit 130 is set to the fixed rotational speed. The operating voltage Vsp to be rotated is supplied (S100).

Here, before the step S100, the opening of the exhaust damper 40 is not easily performed due to the differential pressure according to the pressure of the counter-air of the outdoor air, which is applied to the driving motor 110 as the amount of indoor air exhausted is reduced. When the load decreases and the measured rotation speed of the driving motor 110 increases, the operating voltage Vsp or the feedback operating voltage Vfd corresponding to the measured rotation speed again is preferably stored in advance.

In addition, the driving damper 40 may not be completely opened in response to the pressure of the reverse wind in the feedback operating voltage Vfd corresponding to the operating voltage Vsp of the driving motor 110 stored and stored through the input unit 120. When the normal exhaust is not possible due to the rotation of the reference voltage Vref for stopping the operation of the drive motor 110 for a predetermined time is preferably stored.

After the step S100, the exhaust damper 40 is not easily opened by the pressure of the reverse wind generated from the outside during the exhaust to the exhaust duct 10 by the exhaust fan 31 rotated by the drive motor 110. Accordingly, when the amount of indoor air exhausted by the exhaust duct 30 decreases and the load applied to the driving motor 110 decreases, the rotation speed of the driving motor 110 is rotated by the set fixed rotation speed. Although the voltage (or operating current) is supplied, the error range at the time of design increases, for example, ± 5% of the fixed rpm (ex: 1800 ± 100 (rpm)), at this time, the rotation speed measuring unit 140 The rotational speed of the driving motor 110 is output as a pulse signal by the Hall sensor (not shown) of (S110).

Thereafter, the rotation speed measured by the rotation speed measurement unit 140 by the feedback unit 150 is compared with the fixed rotation speed set by the input unit 120 (S120).

In the step S120, when the measured rotational speed and the fixed rotational speed are not the same or similar within a predetermined range, that is, the measured rotational speed of the drive motor 110 is increased to be greater than the fixed rotational speed due to the differential pressure according to the counter-wind pressure. In operation S130, the operating voltage Vsp of the power supply unit 130 is lowered by the feedback unit 150 so that the measured rotational speed of the driving motor 110 corresponds to the fixed rotational speed, and the corresponding feedback operating voltage Vfd is driven by the feedback unit 150. It is fed back to 110 (S140).

For example, in a state in which the fixed rotational speed of the drive motor 110 set by the input unit 120 is 1800 rpm and the operating voltage of the power supply unit 130 maintaining the fixed rotational speed is Vsp = 6V, When the load applied to the drive motor 110 is reduced due to the differential pressure, the measured rotational speed of the drive motor 110 is 1900 rpm, so that the measured rotational speed of the drive motor 110 becomes 1800 rpm, the fixed rotational speed again. To this end, the feedback operation voltage corresponding thereto causes Vfd = 5V to be fed back to the driving motor 110.

If, in the step S120, the measured rotational speed and the fixed rotational speed are the same or similar within a predetermined range, that is, the measured rotational speed and the fixed rotational speed of the drive motor 110 due to the differential pressure according to the backwind pressure If the difference is within a predetermined range (S130), the feedback unit 150 proceeds to step S110.

Thereafter, the feedback operating voltage (or operating current) Vfd fed back to the driving motor 110 by the feedback unit 150 by the driving motor protection unit 160 is detected (S150).

In step S150, the detected feedback operating voltage Vfd is compared with the reference voltage (or reference current) Vref corresponding to the temporary stop time of the driving motor 110 preset by the input unit 120. When Vfd has a value equal to or less than the reference voltage Vref (S160), the operation of the driving motor 110 is stopped by the driving motor protection unit 160 for a predetermined time (S170).

For example, the operating voltage supplied to the driving motor 110 while the reference voltage Vref set by the input unit 120 is set to correspond to Vfd = 3V among the operating voltages supplied to the driving motor 110 is fed back down. When Vfd = 3V, the exhaust damper 40 cannot be completely opened due to the reverse wind pressure, and thus normal exhaustion is not possible due to the rotation of the drive motor 110. Therefore, the operation of the drive motor 110 is stopped for a predetermined time and is excessive. Rotation or idling is prevented.

In step S150, the detected feedback operating voltage Vfd is compared with the reference voltage (or reference current) Vref corresponding to the temporary stop time of the driving motor 110 preset by the input unit 120. When the operating voltage Vfd has a value exceeding the reference voltage Vref (S160), the driving motor protection unit 160 proceeds to step S150.

Thereafter, when a predetermined time for which the operation of the driving motor 110 is paused in step S170 is exceeded (S180), the driving motor protection unit 160 proceeds to step S100.

If, in step S170, if the predetermined time for which the operation of the drive motor 110 is paused is not exceeded (S180), the drive motor protector 160 proceeds to step S170.

Therefore, according to the present invention as described above, the rotational speed of the drive motor to increase accurately according to the pressure of the reverse wind and accurately corresponds to the fixed speed so that the drive motor has a fixed speed before the increased speed By feedback the feedback operating voltage (or operating current), it is possible to prevent the excessive rotation of the drive motor 110 to prevent overheating and damage.

In addition, by accurately detecting the operating voltage fed back so that the driving motor maintains a fixed rotation speed as the rotational speed of the driving motor increases and comparing it with a preset reference voltage, the exhaust damper cannot be completely opened due to the backwind pressure. It is determined that normal exhaustion is impossible due to the rotation of the motor, and through this, the operation of the driving motor is stopped for a predetermined time, thereby preventing excessive rotation or idling of the driving motor and enabling smooth exhaustion.

On the other hand, according to the drive motor protection device and the method according to the reverse wind of the ventilation system according to a preferred embodiment of the present invention, the reference operating voltage of the drive motor for rotating the exhaust fan provided in the exhaust duct is a reference for determining the reverse wind If it has a value less than the voltage, but it is determined to be the reverse wind, but at the same time as the determination of the reverse wind according to the above method, the input unit, the power supply unit, the rotation speed measuring unit, the feedback unit and the driving motor protection unit air supply duct The air supply fan may be further provided on one side of the air supply fan, and the reverse wind may be determined when the feedback operation voltage of the driving motor for rotating the air supply fan provided in the air supply duct is greater than or equal to the reference voltage.

For example, in the state where the operating voltage at the fixed rotational speed of the drive motor for rotating the air supply fan 11 is 1800 rpm Vsp = 6V, the amount of air supplied by the backwind pressure of the outdoor air increases. If the operating voltage of Vsp = 7V is such that the measured rotational speed becomes fixed again when the measured rotational speed of the driving motor is 1700 rpm because the load applied to the driving motor is large, the feedback operating voltage corresponding to the operating voltage Vsp = 7V is applied to the driving motor. Vfd = 7V is fed back. After that, when the operating speed of the drive motor is 1670 rpm and the operating voltage is Vsp = 8V, the feedback rotational voltage Vfd = 8V corresponding to the operating voltage Vsp = 8V is fed back to the driving motor. do. After that, when the operating speed of the driving motor is 1650 rpm and the operating voltage Vsp = 9V is applied to the fixed speed again, the feedback operating voltage Vfd = 9V corresponding to the operating voltage Vsp = 9V is supplied to the driving motor. do.

In addition, the feedback operation voltage (or operating current) Vfd of the fed back drive motor is detected and compared with the reference voltage (or reference current) Vref corresponding to the temporary stop time of the driving motor preset by the input unit, thereby providing the feedback. When the operating voltage Vfd has a value equal to or greater than the reference voltage Vref, the operation of the driving motor is stopped for a predetermined time.

Therefore, the driving motor protection method according to the reverse wind of the ventilation system according to the above configuration, after the step S100 to S150 or at the same time the feedback operating voltage (or operating current) Vfd of the drive motor for rotating the air supply fan 11 Detecting and comparing it to a reference voltage (or reference current) Vref corresponding to a temporary stop time of the driving motor preset by the input unit, and the detected feedback operating voltage Vfd is input to the input unit 120 in step S160. The air supply fan 11 simultaneously with the feedback operating voltage Vfd having a value equal to or less than the reference voltage Vref compared to the reference voltage (or reference current) Vref corresponding to the temporary operation stop timing of the driving motor 110 preset by the controller. The method may further include determining a case in which the feedback operation voltage Vfd of the driving motor to rotate has a value equal to or greater than the reference voltage Vref.

Therefore, according to the present invention as described above, the feedback operation voltage of the drive motor for rotating the exhaust fan provided in the exhaust duct has a value less than the reference voltage which is a reference for determining the reverse wind, and at the same time or optionally provided in the air supply duct If the feedback operating voltage of the driving motor for rotating the supplied air supply fan has a value equal to or greater than the reference voltage, it is determined that a reverse wind occurs, thereby preventing the ventilation system from operating smoothly due to incorrect reverse wind detection caused by a malfunction of the driving motor. It can prevent.

Although the present invention has been described with reference to the specific embodiments, various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

1 is a block diagram showing a drive motor protection device according to the reverse wind of the ventilation system according to an embodiment of the present invention;

2 is a side cross-sectional view showing a ventilation system to which the driving motor protection device according to the reverse wind of FIG. 1 is applied; And

3 is a control flowchart illustrating a method of protecting a driving motor according to a reverse wind of a ventilation system according to an exemplary embodiment of the present invention.

Claims (11)

An air supply duct 10 for supplying outdoor air to a living space by the air supply fan 11, a filter 20 and an exhaust fan 31 for filtering contaminants in the outdoor air by being provided inside the air supply duct 10. Exhaust duct 30 for exhausting the indoor air of the residential space to the outside by the exhaust duct 30, the exhaust damper unidirectionally opened and closed by the hydraulic pressure of the indoor air exhausted by the exhaust fan 31 A ventilation system comprising a heat exchanger (50) for heat-exchanging indoor air and indoor air supplied and exhausted by an air supply fan (11) and an exhaust fan (31), An input unit 120 for setting a fixed rotational speed of the driving motor 110 for rotating the exhaust fan 31; A power supply unit 130 supplying an operating voltage (or operating current) corresponding to the fixed rotational speed of the driving motor 110; The rotation speed of detecting the reverse wind by measuring the rotation speed of the driving motor 110 that is variable (increased) by the pressure (or strength) of the back wind supplied to the exhaust duct 30 and determining whether or not it is similar to the fixed rotation speed. Measuring unit 140; When the rotation speed measured by the rotation speed measurement unit 140 and the fixed rotation speed are not similar, the operating voltage of the power supply unit 130 such that the driving motor 110 has the measurement rotation speed corresponding to the fixed rotation speed ( Or a feedback unit 150 for feeding back a reduced operating current); And Detects the operating voltage (or operating current) of the drive motor 110 fed back in the reduced state by the feedback unit 150 and corresponds to the temporary stop of the drive motor 110 preset by the input unit 120. And a driving motor protection unit 160 to stop the operation of the driving motor 110 for a predetermined time when the pressure of the counterwind is greater than the rotational force of the driving motor 110 by determining whether the voltage corresponds to the reference voltage (or reference current). Drive motor protection device according to the reverse wind of the ventilation system, characterized in that. The driving motor protection apparatus according to the reverse wind of the ventilation system, characterized in that the direct-current brushless motor (BLDC). The frequency generator 140 of claim 1, wherein the rotation speed measuring unit 140 outputs the rotation speed of the driving motor 110 as a pulse signal through a hall sensor (not shown) provided at one side of the driving motor 110. Driving motor protection device according to the reverse wind of the ventilation system, characterized in that it comprises a. The method of claim 1, wherein the reference voltage corresponds to a feedback operating voltage state when the exhaust damper 40 cannot be completely opened according to the pressure of the reverse wind, and thus normal exhaustion is not possible due to the rotation of the driving motor 110. Drive motor protection device against backwind of ventilation system. The air supply duct 10 further includes an input unit 120, a power supply unit 130, a rotation speed measuring unit 140, a feedback unit 150, and a driving motor protection unit 160. When the feedback operating voltage of the driving motor 110 for rotating the exhaust fan 31 of the duct 30 is equal to or higher than the reference voltage, and at the same time, the feedback wind voltage of the driving motor for rotating the air supply fan 11 is higher than the reference voltage. Drive motor protection device according to the reverse wind of the ventilation system, characterized in that the judging. The exhaust damper 40 is not easily opened due to the pressure of the reverse wind generated from the outside while the indoor air is exhausted to the exhaust duct 30 by the exhaust fan 31 rotated by the driving motor 110. Accordingly, when the amount of indoor air exhausted from the exhaust duct 30 decreases and the load applied to the driving motor 110 decreases, the operating voltage (or rotational speed) of the driving motor 110 is rotated by the set fixed rotation speed (or In the drive motor protection method according to the reverse wind of the ventilation system including the drive motor 110 to increase by an error range (± 5% of the fixed rpm) at the time of the design despite the supply of the operating current),  The driving motor 110 for rotating the exhaust fan 31 by the input unit 120 is set to have a fixed rotational speed, and the driving motor 110 is rotated at the fixed rotational speed by the power supply unit 130. A first step of supplying an operating voltage Vsp; A second step of outputting the rotation speed of the driving motor 110 as a pulse signal by a hall sensor (not shown) of the rotation speed measurement unit 140; A third step in which the rotation speed measured by the rotation speed measurement unit 140 by the feedback unit 150 and the fixed rotation speed set by the input unit 120 are compared; When the measured rotational speed of the drive motor 110 is increased by the differential pressure according to the back wind pressure than the fixed rotational speed, the power supply so that the measured rotational speed of the drive motor 110 by the feedback unit 150 to correspond to the fixed rotational speed A fourth step in which the operating voltage Vsp of the supply unit 130 is down and the feedback operating voltage Vfd corresponding thereto is fed back to the driving motor 110; A fifth step of detecting a feedback operating voltage (or operating current) Vfd fed back by the driving motor protection unit 160 to the driving motor 110 by the feedback unit 150; And The feedback operating voltage Vfd is compared with the reference voltage (or reference current) Vref corresponding to the temporary stop time of the driving motor 110 in which the detected feedback operating voltage Vfd is preset by the input unit 120. And a sixth step in which the operation of the driving motor 110 is stopped by the driving motor protection unit 160 for a predetermined time when it has the following value. According to claim 6, Before the first step, when the load applied to the drive motor 110 is small so that the measured rotational speed of the drive motor 110 increases the operating voltage Vsp to the fixed rotational speed again Or a feedback operating voltage Vfd corresponding thereto is stored in advance, and the driving motor protection method according to the reverse wind of the ventilation system. The rotation of the driving motor 110 according to claim 7, wherein the exhaust damper 40 cannot be completely opened in response to the pressure of the reverse wind among the feedback operating voltages Vfd corresponding to the operating voltage Vsp of the driving motor 110 that is set and stored. And a reference voltage Vref which stops the operation of the driving motor 110 for a predetermined time when normal exhaustion is impossible by setting and storing the reference voltage Vref. The method of claim 6, wherein after the sixth step, when the temporary stop time of the driving motor is exceeded, the first step is to proceed to the first step. The method of claim 6, wherein after or at the same time as the first step, The drive motor 110 for rotating the air supply fan 11 by the input unit 120 is set to have a fixed rotational speed and the drive motor 110 by the power supply unit 130 is rotated to the set fixed rotational speed A seventh step of supplying an operating voltage Vsp; An eighth step of outputting the rotation speed of the driving motor 110 as a pulse signal by a hall sensor (not shown) of the rotation speed measurement unit 140; A ninth step in which the rotation speed measured by the rotation speed measurement unit 140 by the feedback unit 150 and the fixed rotation speed set by the input unit 120 are compared; When the measured rotational speed of the drive motor 110 is lower than the fixed rotational speed due to the differential pressure according to the back wind pressure, the power supply so that the measured rotational speed of the drive motor 110 by the feedback unit 150 to correspond to the fixed rotational speed A tenth step in which the operating voltage Vsp of the supply unit 130 is increased and the feedback operating voltage Vfd corresponding thereto is fed back to the driving motor 110; And An eleventh step of detecting a feedback operating voltage (or operating current) Vfd fed back by the driving motor protection unit 160 to the driving motor 110 by the feedback unit 150. Drive motor protection according to the method. 12. The method of claim 10, wherein the sixth step comprises the steps of the driving motor for rotating the air supply fan 11 while the feedback operating voltage Vfd of the driving motor for rotating the exhaust fan 31 has a value equal to or less than the reference voltage Vref. And a feedback operation voltage Vfd having a value greater than or equal to the reference voltage Vref. The driving motor protection method according to the reverse wind of the ventilation system, characterized in that the operation of the driving motor is stopped for a predetermined time.

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