JP2014105927A - Air-supply and air-exhaust type ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-supply and air-exhaust type ventilator capable of informing each of a clogged state of an air-supply filter and a clogged state of an air-exhaust filter for a long time usage.SOLUTION: This air-supply and air-exhaust type ventilator comprises a control means 40 for detecting a duct pressure loss of each of air-supply passage 14 and ait-exhaust passage 15 in reference to a current and the number of rotation of one DC motor 20 and adjusting an opening area of any of air-supply damper 22 and air-exhaust damper 23 connected to air passage of low duct pressure loss in compliance with a desired number of rotation of the DC motor 20; a repeating means 46 for performing an adjustment again under a specified time; a clogged state judgment means 48 for comparing an initial number of rotation with a number of rotation determined again and judging a clogged state of the air-supply filter 26 and the air-exhaust filter 27 in reference to a difference in the number of rotation; and a filter clogged state informing means 28.

Description

  The present invention relates to a supply / exhaust type ventilator that can maintain a target air volume and maintain a balance between the supply and exhaust air volume when supplying and exhausting air simultaneously with one DC motor.

  The prior art will be described with reference to FIG. Conventionally, this type of supply / exhaust type ventilator includes a DC motor 101 having a supply fan in the supply air path inside the main body 100, a DC motor 102 having a discharge fan in the exhaust air path, Supply / exhaust type ventilation having a heat exchanger 103 at a position where the supply air passage and the exhaust air passage intersect, and a control device 104 capable of independently controlling the drive voltage and the rotational speed of each of the direct current motor 101 and the direct current motor 102. An apparatus has been known (see, for example, Patent Document 1).

JP 2010-190524 A

  Such a conventional supply / exhaust type ventilation device includes a DC motor and fan for exhaust in addition to a DC motor and fan for supplying air inside the main body, and each of the DC air motor and the exhaust air path is provided by each DC motor. By controlling the air volume while detecting pressure loss, the target air volume can be maintained for both supply and exhaust, but two DC motors and a fan must be provided, which increases the volume of the main body and restricts the installation location of the main body. In addition, there is a problem that power consumption increases because two DC motors must be driven.

  Further, in order to realize downsizing of equipment, a supply / exhaust type ventilator having an air supply fan and an exhaust fan with one DC motor as both axes is known. In this case, it is common to arrange an air supply duct and an exhaust duct for connecting to the outside on one side of the product in order to improve workability. This eliminates the degree of freedom of arrangement of the DC motor to which the heat exchanger and the two fans are connected. As a result, it is difficult to maintain the in-machine pressure loss of each of the supply air path and the exhaust air path in an even state of 1: 1. Met. In addition, in addition to in-machine pressure loss, duct pressure loss connected to the outside is taken into account, and the pressure balance applied to the air supply fan and exhaust fan changes, resulting in insufficient air volume, excessive air volume, air supply and exhaust air There was a problem that the balance of air volume of the air became uneven.

  Therefore, it is considered that dampers are provided in the supply air passage and the exhaust air passage, and the opening degree of the damper is adjusted in the initial stage of construction so that the pressure loss of the other air passage is matched with the air passage having one large pressure loss. It was.

  However, it has been found that if the air filter is used for a long period of time, the air supply filter and the exhaust filter are clogged with dust, dust, and insects, and the power consumption of the DC motor for securing the target air volume increases rapidly. Further, since the user does not know the clogged state of the filter, it is necessary to maintain both the air supply filter and the exhaust filter.

  The present invention solves the above problems, and when the filter is clogged during long-term use, the user can check the clogged state of the air supply filter and the exhaust filter, respectively, and perform maintenance efficiently. An object is to provide a supply / exhaust type ventilation device.

  In order to achieve this object, the present invention comprises a main body provided with an indoor suction port, an indoor discharge port, an outdoor suction port, and an outdoor discharge port, and the opening area of the outdoor suction port. An air supply damper that adjusts the opening area of the outdoor discharge port, an air supply filter at the outdoor intake port, an exhaust filter at the indoor intake port, the air supply filter, and the air filter Filter clogging state notifying means for displaying the clogged state of the exhaust filter, an air supply passage for communicating outside air from the outdoor side suction port to the indoor side discharge port, and indoor air from the indoor side suction port to the chamber An exhaust air passage communicating with the outer discharge port, an air supply fan and an exhaust fan respectively disposed in the air supply air passage and the exhaust air passage, and a direct current that drives the air supply fan and the exhaust fan by a single drive shaft motor A direct current motor, damper drive control means for driving the supply damper and exhaust damper, direct current motor drive control means for adjusting the drive voltage of the direct current motor, and rotational speed detection for detecting the rotational speed of the direct current motor And a supply / exhaust type ventilator comprising: control means for controlling the drive voltage to the DC motor so as to achieve a target rotational speed by adjusting the opening degree of the supply damper and the exhaust damper. The control means includes target rotational speed determining means for determining the target rotational speed at which the air volume of the supply air path and the exhaust air path becomes a target air volume, and the initial target rotational speed that is the target rotational speed and is initially determined. The target rotational speed is stored in the initial target rotational speed storage means, and the rotational speed detected by the rotational speed detection means is compared with the target rotational speed to control the drive voltage to the DC motor so as to reach the target rotational speed. Rotation control means, timer means for integrating the operation time during which the drive voltage to the DC motor is controlled by the operation control means, and when the operation time accumulated by the timer means exceeds a certain time, The repetitive means for re-determining the target rotational speed by the target rotational speed determining means and the initial target rotational speed and the re-determined target rotational speed are compared. Filter clogging state determining means for determining clogging, and reporting clogged states of the air supply filter and the exhaust filter based on the determination result of the filter clogging state determining means, respectively. It achieves the intended purpose.

  According to the present invention, the main body includes an indoor suction port, an indoor discharge port, an outdoor suction port, and an outdoor discharge port, and an air supply damper that adjusts an opening area of the outdoor suction port; An exhaust damper that adjusts the opening area of the outdoor discharge port, an air supply filter at the outdoor intake port, an exhaust filter at the indoor intake port, and a clogged state of the air supply filter and the exhaust filter, respectively Filter clogging state notification means for displaying, an air supply passage for communicating outside air from the outdoor suction port to the indoor discharge port, and an exhaust air for communicating indoor air from the indoor suction port to the outdoor discharge port A direct current motor that is a direct current motor that drives the air supply fan and the exhaust fan by a single drive shaft, and an air supply fan and an exhaust fan respectively disposed in the air supply path and the exhaust air path; air supply Damper drive control means for driving the damper and the exhaust damper, DC motor drive control means for adjusting the drive voltage of the DC motor, rotation speed detection means for detecting the rotation speed of the DC motor, and the air supply damper, A supply / exhaust type ventilator comprising a control means for controlling the drive voltage to the DC motor so as to adjust the opening of the exhaust damper to a target rotational speed, wherein the control means includes the supply air flow Target rotational speed determining means for determining the target rotational speed at which the air volume of the road and the exhaust air path becomes a target air volume, and an initial target rotational speed memory for storing the initial rotational speed that is the target rotational speed and is initially determined And an operation control means for controlling the drive voltage to the DC motor so as to obtain the target rotational speed by comparing the rotational speed detected by the rotational speed detecting means with the target rotational speed, and the operational control. Timer means for accumulating the operation time for controlling the drive voltage to the DC motor by the stage, and when the operation time accumulated by the timer means exceeds a certain time, the target rotational speed that becomes a target air volume is set to the target A filter clogging state in which it is determined that the filter is clogged by comparing the initial target rotation speed and the re-determined target rotation speed by comparing the initial target rotation speed and the re-determined target rotation speed when the rotation speed difference is greater than a predetermined value. And determining means, so that the operation control means controls the drive voltage of the DC motor, and when the operation time accumulated by the timer means reaches a certain time or longer, the repetition means is the target rotation Acting on a speed determining means to determine the target rotational speed, and the filter clogging state determining means is stored in the initial target rotational speed storage means. Comparing the memorized initial target rotational speed with the re-determined target rotational speed, if the rotational speed difference exceeds a predetermined value, it is determined that the filter is clogged, and the filter clogging state notification means An air supply / exhaust type ventilator that allows a user to check which of the air supply filter and the exhaust filter is clogged and to perform efficient filter maintenance in order to notify the clogged state of the exhaust filter. Can be provided.

Configuration diagram of Embodiment 1 of the present invention ((a) side view, (b) bottom view) Block diagram of the control circuit of the first embodiment Block diagram of CPU of the first embodiment Control flowchart of basic operation of the first embodiment Control flowchart of characteristic operation of the first embodiment Configuration diagram of conventional technology

  The supply / exhaust type ventilator according to claim 1 of the present invention comprises a main body comprising an indoor suction port, an indoor discharge port, an outdoor suction port, and an outdoor discharge port, and the opening of the outdoor suction port. An air supply damper that adjusts an area; an exhaust damper that adjusts an opening area of the outdoor discharge port; an air supply filter at the outdoor intake port; an exhaust filter at the indoor intake port; and the air supply filter; Filter clogging state notification means for displaying the clogged state of the exhaust filter, an air supply air passage for communicating outside air from the outdoor suction port to the indoor discharge port, and indoor air from the indoor suction port An exhaust air passage communicating with an outdoor discharge port, an air supply fan and an exhaust fan disposed in each of the air supply air passage and the exhaust air passage, and the air supply fan and the exhaust fan are driven by one drive shaft. DC motor DC motor, damper drive control means for driving the air supply damper and exhaust damper, DC motor drive control means for adjusting the drive voltage of the DC motor, and rotation speed detection means for detecting the rotation speed of the DC motor And a supply / exhaust type ventilator comprising: a control means for controlling a drive voltage to the DC motor so as to obtain a target rotational speed by adjusting an opening degree of the supply damper and the exhaust damper; The means includes target rotational speed determining means for determining the target rotational speed at which the air volume of the supply air path and the exhaust air path becomes a target air volume, and an initial target rotational speed that is the target rotational speed and is initially determined. An operation for controlling the drive voltage to the DC motor so as to obtain the target rotational speed by comparing the target rotational speed with the initial rotational speed detected by the rotational speed detection means and the initial target rotational speed storage means for storing Control means, timer means for accumulating the operation time for controlling the drive voltage to the DC motor by the operation control means, and the target air volume when the operation time accumulated by the timer means exceeds a certain time The repetitive means for re-determining the target rotational speed by the target rotational speed determining means and the initial target rotational speed and the re-determined target rotational speed are compared. Filter clogging state determination means for determining the clogging state of the air supply filter and the exhaust filter based on the determination result of the filter clogging state determination means.

  As a result, when the operation control means controls the drive voltage of the DC motor and the operation time accumulated by the timer means reaches a certain time or more, the repetition means acts on the target rotational speed determination means to The rotation speed is determined, and the filter clogging state determination means compares the initial target rotation speed stored in the initial target rotation speed storage means with the re-determined target rotation speed so that the rotation speed difference is a predetermined value. When the above is reached, it is determined that the filter is clogged, and the clogged state of the air supply filter and the exhaust filter is notified by the filter clogging state notification unit, so that the user can determine which of the air supply filter and the exhaust filter. It is confirmed that the filter is clogged and the filter can be efficiently maintained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The supply / exhaust type ventilation apparatus 1 according to the first embodiment of the present invention is installed on a ceiling in a building, or on a ceiling and attic space, or on a side wall. Hereinafter, a case where it is installed on a ceiling will be described.

  A main body 2 shown in FIG. 1A has a rectangular parallelepiped shape having the lowest height direction among the three sides, and is installed in parallel to the ceiling surface 3.

  Moreover, as shown in FIG.1 (b), it has the outdoor side inlet port 5 and the outdoor side discharge port 6 in one side surface 4 including the side of a transversal direction among the height direction and the other two sides, The duct 7 having a diameter of 100 mm can be connected.

  The duct 7 connected to the outdoor suction port 5 and the outdoor discharge port 6 is routed to the building outer wall surface 8 to communicate with outside air outside the building.

  An indoor suction port 9 is formed on the lower surface of the main body 2.

  The opposed surface 10 of the side surface 4 has a discharge port 11 on the indoor side, and similarly has a shape to which a duct 12 having a diameter of about 100 [mm] can be connected.

  In the present embodiment, the duct 12 connected to the room-side discharge port 11 is branched into a plurality of small-diameter ducts 13 and communicates with the ceiling surface of each room to supply outside air into the room.

  The indoor discharge port 11 is branched into a plurality of small-diameter ducts 13. In view of this, by making the indoor outlets 11 of the opposing surface 10 of the main body 2 into a shape that allows a plurality of small-diameter ducts 13 to be connected, the labor of branching the ducts can be saved.

  Inside the main body 2, there are formed an air supply air passage 14 through which outside air introduced from the outside through the duct 7 is supplied indoors, and an exhaust air passage 15 that exhausts indoor air to the outside.

  The supply air passage 14 and the exhaust air passage 15, which are these two ventilation paths, are partitioned by partition plates 16 and 17.

  The supply air passage 14 and the exhaust air passage 15 are respectively provided with a sirocco-type supply fan 18 and an exhaust fan 19.

  The air supply fan 18 and the exhaust fan 19 are connected to rotating shafts extending on both sides of one DC motor 20.

  Further, a heat exchange element 21 for exchanging the heat of the room air and the outside air is arranged at a position where the supply air passage 14 and the exhaust air passage 15 intersect.

  The heat exchange element 21 has a function of collecting the heat of the exhaust air from the room and supplying it to the supply air from the outside.

  The outdoor suction port 5 and the outdoor discharge port 6 of the main body 2 are provided with an air supply damper 22 and an exhaust damper 23 as dampers that can block intrusion of outside air.

  The air supply damper 22 is disposed in the outdoor suction port 5. The air supply damper 22 is connected to the electric motor 24 through a shaft, and adjusts the opening area of the outdoor-side suction port 5.

  Further, the exhaust damper 23 is disposed at the outdoor discharge port 6. The exhaust damper 23 is connected to the electric motor 25 with a shaft to adjust the opening area of the outdoor discharge port 6.

  Here, examples of the motors 24 and 25 include a stepping motor, and the number of steps can be controlled, and the opening area can be finely set and adjusted.

  An air supply filter 26 and an exhaust filter 27 are provided in the supply air passage 14 and the exhaust air passage 15, respectively.

  The air supply filter 26 and the exhaust filter 27 have a function of preventing dust, dust, insects and the like from entering the inside of the main body 2.

  The air supply passage 14 is arranged in the order of the outdoor air inlet 5, the air supply damper 22, the air supply filter 26, the heat exchange element 21, the air supply fan 18, and the indoor side discharge port 11.

  Further, the exhaust air passage 15 is disposed in the order of the indoor suction port 9, the exhaust filter 27, the heat exchange element 21, the exhaust fan 19, the exhaust damper 23, and the outdoor discharge port 6.

  On the lower surface of the main body 2, filter clogging state informing means 28 for informing the clogging states of the air supply filter 26 and the exhaust filter 27 are provided.

  Here, the filter clogging state notification means 28 may be an LED, for example, and provided with an LED 28a and an LED 28b corresponding to the air supply filter 26 and the exhaust filter 27, respectively. When the LED is turned off, the clogged states of the air supply filter 26 and the exhaust filter 27 can be displayed. If different colors are used for the LED 28a and the LED 28b, it is easier for the user to confirm and it is better.

  FIG. 2 is a block diagram showing the configuration of the control circuit.

  The block of the control circuit has a power supply circuit 30 connected to a commercial power supply 29, and a drive device 31 that drives the DC motor 20, the supply damper 22, and the exhaust damper 23.

  The power supply circuit 30 includes a rectifying / smoothing circuit 32 including a diode bridge and an electrolytic capacitor. Then, the voltage rectified and smoothed by the rectifying and smoothing circuit 32 is dropped through a switching element 33 such as an FET or a switching transformer 34, and a voltage supplied to the DC motor 20 and the driving device 31, for example, DC30 [V] is supplied. Is to be generated.

  The DC motor 20 is a motor having a three-phase (U, V, W phase) stator winding.

  The DC motor 20 includes a drive IC for controlling voltage application to the stator winding, a DC motor drive control means 35, and a Hall element 36 which is a position detection sensor for detecting the position of the rotor. It consists of

  In this embodiment, the voltage supplied to the DC motor 20 is the low-voltage DC 30 [V] connected to the subsequent stage of the switching transformer 34, but is not limited to this.

  For example, the commercial power supply 29 can be driven by high-voltage DC 141 [V] or DC 282 [V] obtained by direct rectification and smoothing.

  The drive device 31 includes a rotation speed detection unit 37, a current detection unit 38, a damper drive control unit 39, and a control unit 40.

  The rotation speed detection means 37 detects the rotation speed of the DC motor 20 from the signal from the Hall element 36.

  The current detection means 38 detects the current of the DC motor 20 by detecting the voltage between both ends of a resistor or the like connected to the U, V, W phase common line of the DC motor 20.

  The damper drive control means 39 drives the electric motors 24 and 25 of the supply damper 22 and the exhaust damper 23.

  The control means 40 receives the signals from the rotational speed detection means 37 and the target rotational speed determination means 43 and controls the DC motor drive control means 35 and the damper drive control means 39 so that the rotational speed of the DC motor becomes the target rotational speed. To achieve the target air volume.

  The damper drive control means 39 drives the motors 24 and 25 of the air supply damper 22 and the exhaust damper 23 according to the signal from the control means 40, and adjusts and controls the opening and closing of each damper.

  The control means 40 is constituted by a CPU (Central Processing Unit), and is driven by a DC5 [V] or DC3 [V] voltage formed by dropping the voltage from the applied voltage of the DC motor 20 by the regulator 41.

  Next, the structure of the control means 40 is demonstrated using the block diagram of FIG.

  The control means 40 forms a pulse or an analog signal and transmits the signal to the DC motor drive control means 35, and the DC motor 20 executes speed control and stop.

  The operation of the control means 40 to be described later is implemented in the form of a program in which the counter, RAM, and ROM in the control means 40 cooperate.

  The control means 40 determines the DC motor drive control means 35 from the target rotational speed of the DC motor 20 determined by the target rotational speed determination means 43 with respect to the target air volume 42, and the openings of the supply damper 22 and the exhaust damper 23. The operation control means 44 for controlling the damper drive control means 39, the timer means 45 for integrating the operation time for controlling the drive voltage to the DC motor 20 by the operation control means 44, and the operation time accumulated by the timer means 45. When a predetermined time or more is reached, the repetitive means 46 for re-determining the target rotational speed to be the target air volume 42 by the target rotational speed determining means 43, and the target rotational speed first determined by the target rotational speed determining means 43 as the initial target rotational speed. The initial target rotational speed storage means 47 for storing, the initial target rotational speed and the target rotational speed determined again in each of the supply air passage 14 and the exhaust air passage 15. When the rotational speed difference by comparing the bets becomes a certain value or more is determined that the filter clogging, a filter clogging state determining means 48 for informing the filter clogging the filter clogging state informing unit 28.

  The target rotational speed determining means 43 operates the DC motor drive control means 35 to drive voltage from the relationship between the current detected by the current detecting means 38 and the rotational speed detected by the rotational speed detecting means 37 so that the target air volume 42 is obtained. And the target rotational speed at that time is calculated.

Further, the target rotational speed determining means 43 has the DC motor 20 necessary for holding the target air volume 42 in the duct length range of 0 [m] to 30 [m], for example, 100 [m ³ / h]. The rotational speed and current calculated from the relational expression between the rotational speed and the current are stored in advance as table data for each of the supply air passage 14 and the exhaust air passage 15.

  For example, the duct length may be input every 0, 5, 10 [m] and 5 [m], but is not limited to this, and by subdividing, for example, by having table data for every 1 m, It is also possible to adopt a method for improving the accuracy of air volume control.

  As long as the air pressure loss in the main body 2 has an equal relationship of 1: 1 for both the air supply passage 14 and the exhaust air passage 15, it is only necessary to store one rotation speed and current value.

  However, the pressure loss in the body may not be the same depending on the size restrictions of the main body 2, the size of the heat exchange element 21, and the location of the heat exchange element 21. Therefore, in the present embodiment, table data is stored for each of the supply air passage 14 and the exhaust air passage 15.

  The target rotational speed determination means 43 determines the target rotational speed of the exhaust air passage 15 and the target rotational speed of the air supply air passage 14, respectively.

When the target rotational speed of the exhaust air passage 15 is determined, the exhaust air passage 15 has a target air volume 42, for example, 100 [m ³ / h], with the air supply damper 22 fully closed and the exhaust damper 23 fully open. The voltage is adjusted while maintaining the relationship with the current value when the air volume is realized, and the rotation speed is detected to obtain the target rotation speed of the exhaust air passage 15.

When determining the target rotational speed of the supply air passage 14, the supply air passage 14 has a target air volume 42, for example, 100 [m ³ / h], with the supply damper 22 fully opened and the exhaust damper 23 fully closed. The voltage is adjusted while maintaining the relationship with the current value when realizing the air volume of the air flow, and the rotational speed is detected to obtain the target rotational speed of the air supply air passage 14.

  Then, the target rotational speed of the exhaust air passage 15 and the target rotational speed of the supply air passage 14 are compared, and the larger target rotational speed is output to the operation control means 44 as the target rotational speed for driving the DC motor 20.

  Further, the target rotational speed determination means 43 stores the target rotational speed determined for the first time in the initial target rotational speed storage means 47 as the initial target rotational speed. The initial target rotational speed storage means 47 includes, for example, an EEPROM, and stores the initial target rotational speeds of the exhaust air passage 15 and the supply air passage 14 respectively.

  The operation control means 44 controls the DC motor voltage so as to achieve the target rotational speed determined by the target rotational speed determination means 43. At that time, the air volume of the exhaust air passage 15 and the supply air passage 14 is in a balance of 1: 1. The air volume is balanced by adjusting the damper with the smaller pressure loss in the air path.

The operation time during which the drive voltage to the DC motor 20 is controlled by the timer means 45 and the operation control means 44 is integrated. For example, when operated for 1 hour at 100 [m ³ / h], the timer means 45 stores 1 and stores 2 for 2 hours. Further, here, the integration is performed every hour, but the integration timing can be changed to 30 minutes and 90 minutes.

  The repeating means 46 sends a command to the target rotational speed determining means 43 when the value accumulated by the timer means 45 becomes a certain value or more, so that the target rotational speed is determined again. For example, if the constant value of the timer means 45 is 1000, the repeat means 46 sends a command to the target rotational speed determination means 43 when the integrated value of the operating time becomes 1000. The constant value can be changed to 5000, 10000.

  The filter clogging state determining means 48 compares the initial target rotational speed with the determined target rotational speed again, and determines that the filter is clogged when the rotational speed difference exceeds a certain value. To notify the filter clogging. In other words, since the target rotational speed that becomes the target air volume 42 increases as the pressure loss of the filter increases due to dust, dust, insects, etc., the rotational speed difference obtained by subtracting the initial target rotational speed from the target rotational speed that has been determined again is the filter. It becomes clogged. For example, if the constant value of the filter clogging state determining means 48 is 100 [rpm], the filter clogging state determining means 48 sends a command to the filter clogging state notifying means 28 when the rotational speed difference is 100 [rpm] or more. Is. The constant value may be, for example, a rotational speed increase value when the power consumption of the DC motor increases rapidly, and may be stored in advance in a CPU ROM or the like. In addition, the constant value may be the same value in the exhaust air passage 15 and the supply air passage 14, but is not limited to this, and when the pressure loss in the body is not the same, the exhaust air passage 15 and the supply air passage 14 respectively. A value may be provided.

  In the above configuration, a basic operation for determining the repetitive target rotational speed, which is a premise of the present embodiment, and maintaining the air volume balance between the supply air and the exhaust will be described with reference to the flowchart shown in FIG.

  In this flow, the step of fully opening the air supply damper 22 and the exhaust damper 23 (STEP 1), the step of determining the target rotational speed in the exhaust air passage 15 with respect to the target air volume 42 (STEP 2), and the supply of air to the target air volume 42 are performed. Step (STEP 3) for determining the target rotational speed in the air air passage 14; Step (STEP 4) for determining the target rotational speed for driving the DC motor 20; It consists of a returning step (STEP 5). Then, the target rotational speed determination means 43 is executed in a state where the ducts 7 and 12 are connected to the main body 2 and can be operated.

  When the power is first turned on or a command from the repetition means 46 is sent to the target rotational speed determination means 43, the control means 40 fully opens the supply damper 22 and the exhaust damper 23 as shown in STEP1.

Next, as shown in STEP 2, the target rotational speed determination means 43 controls the damper drive control means 39 to fully close the air supply damper 22 while keeping the exhaust damper 23 fully open. Then, the DC motor drive control means 35 is controlled by the operation control means 44 so as to match the relational expression between the current and the rotation speed in the exhaust air passage 15 stored in advance in the target rotation speed determination means 43, and the DC motor 20 is To drive. Thereby, one target rotational speed N1 can be obtained. This target rotational speed N1 is rotational speed information necessary for maintaining a target air volume 42, for example, 100 [m ³ / h], in the length of the duct actually connected to the exhaust air passage 15.

Next, as shown in STEP 3, the target rotational speed determination unit 43 controls the damper drive control unit 39 to bring the air supply damper 22 into a fully open state and the exhaust damper 23 into a fully closed state. Then, the DC motor drive control means 35 is controlled by the operation control means 44 so as to match the relational expression between the current and the rotation speed in the supply air passage 14 stored in advance in the target rotation speed determination means 43, and the DC motor. 20 is driven. Thereby, one target rotational speed N2 can be obtained. This target rotational speed N2 is rotational speed information necessary for maintaining a target air volume 42, for example, 100 [m ³ / h], in the length of the duct actually connected to the supply air path 14.

  Next, as shown in STEP 4, the target rotational speed determination means 43 compares the target rotational speed N 1 of the exhaust air passage 15 with the target rotational speed N 2 of the air supply air passage 14, and the operation control means 44 controls the direct current motor drive control. A target rotational speed for controlling the means 35 is determined.

  That is, when the target rotational speed N1 ≧ the target rotational speed N2, the target rotational speed N1 is set as the target rotational speed. Further, when the target rotational speed N1 <the target rotational speed N2, the target rotational speed N2 is set as the target rotational speed.

  In other words, the operation control means 44 is commanded to a target rotational speed that can satisfy the target air volume when the air path pressure loss of the exhaust air path 15 and the supply air path 14 is larger.

  At that time, since it is driven by one DC motor 20, the air volume with the smaller air path pressure loss becomes larger.

  Therefore, in order to balance the air flow, the balance between the exhaust air passage 15 and the supply air passage 14 is adjusted by adjusting the damper opening degree of the smaller target rotational speed so that the target rotational speed becomes larger. Can be taken.

  Next, as shown in STEP 5, the timer unit 45 integrates the operation time from the end of STEP 4 to obtain T 1. Next, the repeating unit 46 compares the set values T2 and T1 for causing the target rotational speed determining unit 43 to perform the operation again. If T1 <T2, the operation is continued with the content determined in STEP4. During operation, the timer means 45 accumulates time and updates T1. After the update, the repeater 46 compares T1 and T2 again and repeats the update of T1 until T1> T2. When T1> T2, the repeating unit 46 causes the above flow to start from STEP1.

  As described above, it has been described that the air flow is readjusted according to the increase in the pressure loss of the filter due to dust, dust, insects, etc. by periodically performing the above flow.

  In STEP 4 of FIG. 4, the target rotational speed determining means 43 compares the target rotational speed N1 of the exhaust air passage 15 with the target rotational speed N2 of the air supply air passage 14, and the operation control means 44 is a DC motor drive control means. The target rotational speed for controlling 35 is determined, but the target when the pressure loss of the exhaust air passage 15 or the supply air passage 14 is increased by the clogging of the filter due to dust, dust, insects, etc., and the target air volume 42 is reached. As the rotational speed increases, the power consumption of the DC motor 20 may increase rapidly.

  That is, in order to secure the required air volume with low power consumption, it is necessary to notify the user of clogging of the exhaust filter 27 or the air supply filter 26 and have the filter maintained.

  Therefore, as in the present embodiment, the filter clogging state determining means 48 determines the filter clogging state by comparing the initial target rotational speed with the determined target rotational speed, and notifies the user. It becomes extremely important.

  Next, the operation will be described with reference to the flow of FIG.

  In this flow, the step of fully opening the air supply damper 22 and the exhaust damper 23 (STEP 1), the step of determining the target rotational speed in the exhaust air passage 15 with respect to the target air volume 42 (STEP 2), and the supply of air to the target air volume 42 are performed. A step (STEP 3) for determining the target rotational speed in the air air passage 14, a step (STEP 4) for storing the target rotational speed determined for the first time, an initial target rotational speed of the exhaust air passage 15 and a target rotational speed determined again. A step of determining the filter clogging state (STEP 5), a step of comparing the initial target rotation speed of the supply air passage 14 with the determined target rotation speed again to determine the filter clogging state (STEP 6), The step of determining the target rotational speed for driving the DC motor 20 (STEP 7), and the operation time is integrated and when it exceeds a certain level, ST Back to P1 consists of step (STEP8). Since the operations other than STEP 4 to STEP 6 are the same as the operations described in the basic flow, detailed description thereof will be omitted.

  By STEP3, the target rotational speed N1 of the exhaust air passage 15 and the target rotational speed N2 of the air supply air passage 14 have been determined.

  Next, as shown in STEP 4, when the target rotational speed is determined for the first time, the target rotational speed determining means 43 sets the determined target rotational speed N1 and the target rotational speed N2 as the initial target rotational speed N1 ′ and the initial target rotational speed. N2 ′ is stored in the initial target rotational speed storage means 47. That is, the rotation speed in a state where the exhaust filter 27 and the air supply filter 26 are not clogged with dust, dust, insects, or the like is stored as an initial value. When the target rotational speed is determined for the first time, STEP5 to STEP6 are not performed.

  Next, as shown in STEP 5, the filter clogging state determination means 48 subtracts the initial target rotational speed N1 'from the determined target rotational speed N1 of the exhaust air passage 15 to calculate the rotational speed difference. If the rotational speed difference is equal to or greater than a predetermined value N1d stored in advance, for example, 100 [rpm], it is determined that the filter is clogged, and a command is sent to the filter clogging state notification means 28. When receiving the command, the filter clogging state notifying means 28 notifies that the exhaust filter 27 is clogged.

  Next, the filter clogging state determination means 48 calculates the difference in rotation speed by subtracting the initial target rotation speed N2 'from the determined target rotation speed N2 of the air supply air passage 14 again as shown in STEP6. If the rotational speed difference is equal to or greater than a predetermined value N1d stored in advance, for example, 100 [rpm], it is determined that the filter is clogged, and a command is sent to the filter clogging state notification means 28. When the filter clogging state notifying means 28 receives the command, it notifies that the air supply filter 26 is clogged.

  As described above, the initial target rotational speed is compared with the re-determined target rotational speed, and the clogged state of the exhaust filter 27 and the air supply filter 26 is determined based on the rotational speed difference. If the filter is clogged, notification is made. By doing so, the user can confirm which of the exhaust filter 27 and the air supply filter 26 is clogged, and can efficiently maintain the filter.

  The above flow is continued even when the filter is clogged, but the operation may be stopped when the DC motor becomes clogged to a state where the necessary air volume cannot be achieved.

  The air conditioner according to the present invention secures a predetermined air volume and keeps a balance between the air supply and exhaust air volume when exhausting and supplying air simultaneously with a single DC motor. This is useful for supply / exhaust air conditioners.

DESCRIPTION OF SYMBOLS 1 Supply / exhaust type ventilator 2 Main body 3 Ceiling surface 4 Side surface 5 Outdoor suction port 6 Outdoor discharge port 7 Duct 8 Building outer wall surface 9 Indoor suction port 10 Opposing surface 11 Indoor discharge port 12 Duct 13 Small-diameter duct 14 Supply Airflow path 15 Exhaust airflow path 16 Partition plate 17 Partition plate 18 Air supply fan 19 Exhaust fan 20 DC motor 21 Heat exchange element 22 Air supply damper 23 Exhaust damper 24 Electric motor 25 Electric motor 26 Air supply filter 27 Exhaust filter 28 Filter clogging state notification Means 29 Commercial power supply 30 Power supply circuit 31 Driving device 32 Rectification smoothing circuit 33 Switching element 34 Switching transformer 35 DC motor drive control means 36 Hall element 37 Speed detection means 38 Current detection means 39 Damper drive control means 40 Control means 41 Regulator 42 Target Air volume 43 Target rotation Number determination means 44 Operation control means 45 Timer means 46 Repetition means 47 Initial target rotational speed storage means 48 Filter clogging state determination means

Claims (1)

The main body includes an indoor suction port, an indoor discharge port, an outdoor suction port, and an outdoor discharge port, an air supply damper that adjusts an opening area of the outdoor suction port, and the outdoor discharge port An exhaust damper that adjusts the opening area, an air supply filter at the outdoor suction port, an exhaust filter at the indoor suction port, and a filter clogging state that displays the clogging state of the air supply filter and the exhaust filter, respectively An air supply passage for communicating outside air from the outdoor suction port to the indoor discharge port; an exhaust air flow passage for communicating indoor air from the indoor suction port to the outdoor discharge port; and the supply air flow An air supply fan and an exhaust fan respectively disposed on the road and the exhaust air passage, a DC motor that drives the air supply fan and the exhaust fan by a single drive shaft, and drives the air supply damper and the exhaust damper Damper drive control means, DC motor drive control means for adjusting the drive voltage of the DC motor, rotation speed detection means for detecting the rotation speed of the DC motor, and opening degrees of the supply damper and the exhaust damper. A supply / exhaust type ventilator having a control means for controlling a drive voltage to the DC motor to be adjusted to a target rotational speed, wherein the control means includes the supply air path and the exhaust air path. Target rotational speed determining means for determining the target rotational speed at which the air volume becomes the target air volume, initial target rotational speed storage means for storing the initial rotational speed that is the target rotational speed and is initially determined, and the rotational speed detection An operation control means for comparing the rotation speed detected by the means with the target rotation speed to control the drive voltage to the DC motor so as to reach the target rotation speed, and driving to the DC motor by the operation control means Timer means for integrating the operating time for controlling the pressure, and when the operating time accumulated by the timer means exceeds a certain time, the target rotational speed to be the target air volume is determined again by the target rotational speed determining means. A filter clogging state determination unit that compares the initial target rotation speed with the re-determined target rotation speed and determines that the filter is clogged when a difference in rotation speed exceeds a predetermined value. A supply / exhaust type ventilator that reports the clogging states of the air supply filter and the exhaust filter based on the determination result of the clogging state determination means.

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