JP2014059094A - Supply/exhaust type ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation device capable of maintaining constant control of supply/exhaust air volume and an air volume balance, without reference to a construction state.SOLUTION: A supply/exhaust type ventilation device comprises control means 37 for detecting a duct pressure loss of each of a supply air channel 14 and an exhaust air channel 15 from an electric current and a rotation speed of one DC motor 20 to maintain a predetermined air volume and keep a balance between a supply air volume and an exhaust air volume, and for adjusting an opening area of either of an air supply damper 22 and an exhaust damper 23, which are connected to the air channel with the low duct pressure loss to match the target rotation speed of the DC motor 20.

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 passage inside the main body 100, a DC motor 102 having an exhaust fan in the exhaust air passage, 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 DC motor 101 and the DC 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 a fan for exhausting in addition to a DC motor and a fan for supplying air inside the main body, and each of the DC air motor and the exhaust air path is provided with 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 the miniaturization of equipment, a supply / exhaust type ventilator having a supply fan and an exhaust fan with one DC motor as both shafts 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, and 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.

  The present invention solves the above-mentioned problem, and in a supply / exhaust type ventilator having a supply fan and an exhaust fan using a single DC motor as both shafts, a damper is provided for each of the supply and exhaust air paths. And adjust the opening of the damper of the low pressure loss side air passage so that the low pressure loss side air passage is equal to the high pressure loss side to ensure the target air volume and supply and exhaust air An object of the present invention is to provide a supply / exhaust type ventilation device capable of uniformly controlling the air flow balance.

  In order to achieve this object, the present invention provides an indoor suction port disposed on the front surface of the main body, an indoor discharge port disposed on one side surface, and an outdoor suction port disposed on a surface different from the side surface. An outdoor discharge port, an air supply damper that adjusts an opening area of the outdoor suction port, an exhaust damper that adjusts an opening area of the outdoor discharge port, and outdoor air from the outdoor suction port to the chamber An air supply air passage that communicates with the inner discharge port, an exhaust air passage that communicates indoor air from the indoor air intake port to the outdoor air discharge port, and an intersection of the air supply air passage and the exhaust air passage. A heat exchange element for exchanging heat between outdoor air and room air; supply blades and exhaust blades disposed on the leeward side of the heat exchange element; The driving blade and the exhaust blade are driven by a single drive shaft A C 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 current detection means for detecting current flowing through the DC motor; The rotational speed detecting means for detecting the rotational speed of the DC motor, and one of the air supply damper and the exhaust damper is fully open, and the other damper is adjusted to an opening degree so as to reach a target rotational speed. A supply / exhaust type ventilation apparatus comprising a control means for controlling a drive voltage to the DC motor, wherein the control means includes a target rotational speed of the DC motor, an air supply damper, and an exhaust air with respect to a target air volume. Initial setting means for determining the opening of the damper is provided, and the initial setting means operates the DC motor drive control means to obtain a target air volume and whether the relationship is between the current flowing in the DC motor and the rotational speed. Target exhaust speed determining means for adjusting the drive voltage and calculating the target rotational speed at that time, and the exhaust speed is exhausted by the target rotational speed calculation means with the supply damper fully closed and the exhaust damper fully open. Exhaust air path rotation speed determining means for detecting the rotation speed when the air path achieves the target air volume and setting the rotation speed of the exhaust air path, and the exhaust damper is fully closed and the supply damper is fully opened Then, the target rotational speed calculation means detects the rotational speed when the supply air path realizes the target air volume, and sets the rotational speed of the supply air path as the rotational speed of the supply air path, and the exhaust air Comparing the rotational speed of the road with the rotational speed of the supply air path, and determining the target rotational speed determining means for determining the larger rotational speed as the target rotational speed, and the opening of the damper of the exhaust air path and the supply air path. A damper opening determining means for determining the exhaust air passage and Fully close the damper of the air passage with the larger rotational speed among the air passages of the supply air passage, so that the air passage with the smaller rotational speed becomes the target rotational speed so that the air passage with the smaller rotational speed becomes the target rotational speed. This is to adjust the opening of the damper, thereby achieving the intended purpose.

  According to the present invention, an air supply fan and an exhaust fan are provided on both sides of one DC motor, and the pressure loss of each of the air supply and exhaust air paths is calculated from the relationship between the current of the DC motor and the rotational speed. Thus, it is possible to provide a supply / exhaust type ventilator that can maintain a predetermined air volume by adjusting the damper angle so that the pressure loss of both the air passages is uniform, and can uniformly control the balance of the air supply / exhaust air volume.

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 the first embodiment The figure which shows the angle of the damper at the time of N1> N3 of the same Embodiment 1 ((a) The figure which shows the time of exhaust damper angle detection, (b) Operation | movement explanatory drawing at the time of air volume balance control) The figure which shows the angle of the damper at the time of N1> N3 of the same Embodiment 1 ((a) The figure which shows the time of an air supply damper angle detection, (b) Operation | movement explanatory drawing at the time of air volume balance control at the time of N1 <N3) Block diagram of CPU of Embodiment 2 The figure which shows the rotation speed correction value of the same Embodiment 2. Control flowchart of the second embodiment Configuration diagram of conventional technology

  The supply / exhaust type ventilator according to claim 1 of the present invention includes an indoor suction port disposed on the front surface of the main body, an indoor discharge port disposed on one side surface, and an outdoor suction port disposed on a surface different from the side surface. A discharge damper that adjusts the opening area of the outdoor discharge port, an outdoor damper that adjusts the opening area of the outdoor discharge port, and an outdoor air from the outdoor suction port. An air supply air passage that communicates with the indoor discharge port, an exhaust air passage that communicates indoor air from the indoor air intake port to the outdoor outlet of the previous period, and an intersection between the air supply air passage and the exhaust air passage. A heat exchange element for exchanging heat between outdoor air and indoor air, and supply and exhaust vanes disposed on the leeward side of the heat exchange element, respectively, and the supply and exhaust vanes. DC for driving the air vane and the exhaust vane with a single drive shaft Data, damper drive control means for driving the supply damper and exhaust damper, DC motor drive control means for adjusting the drive voltage of the DC motor, and current detection means for detecting the current flowing through the DC motor; The rotational speed detecting means for detecting the rotational speed of the DC motor, and one of the air supply damper and the exhaust damper is fully open, and the other damper is adjusted to an opening degree so as to reach a target rotational speed. A supply / exhaust type ventilation apparatus comprising a control means for controlling a drive voltage to the DC motor, wherein the control means includes a target rotational speed of the DC motor, an air supply damper, and an exhaust air with respect to a target air volume. Initial setting means for determining the opening degree of the damper is provided, and the initial setting means is driven from the relationship between the current flowing through the DC motor and the rotational speed, which reaches the target air volume by operating the DC motor drive control means. Target rotational speed determining means for adjusting the voltage and calculating the target rotational speed at that time; and in a state where the air supply damper is fully closed and the exhaust damper is fully open, the target rotational speed is calculated by the target rotational speed calculating means. An exhaust air passage rotational speed determining means for detecting the rotational speed when the road realizes the target air volume and setting the rotational speed of the exhaust air passage, and the exhaust damper is fully closed and the supply damper is fully opened. A supply air passage rotation speed determination means that detects a rotation speed when the supply air passage realizes the target air volume by the target rotation speed calculation means and sets the rotation speed of the supply air passage; and the exhaust air passage The target rotational speed determining means for determining the larger rotational speed as the target rotational speed, and determining the opening degree of the exhaust air passage and the supply air path damper The exhaust air passage and the air supply The damper of the wind path with the smaller number of rotations is fully closed so that the damper with the smaller number of rotations becomes the target number of revolutions. The degree of opening is adjusted.

  As a result, even if there is a duct pressure loss difference between the supply and exhaust air passages at each installation site, the exhaust damper is fully closed to create the maximum pressure loss in the exhaust air passage, and the supply air damper is fully opened and the target air volume is reached. , And the current of the DC motor at that time can be detected to calculate the air supply air path pressure loss at the time of construction. It is closed to create a state where the pressure loss of the supply air path is maximum, the exhaust damper is fully opened to realize the rotation speed when realizing the target air volume, and the current of the DC motor at that time is detected to detect the current By calculating the exhaust airway pressure loss and adjusting the damper angle of the airway with the lower pressure loss, the pressure loss in both the air supply airway and the exhaust airway can be made equal and the air volume balance can be made uniform. Play.

  Further, the supply / exhaust type ventilator according to claim 2 is based on the relationship between the rotation speed of the exhaust air passage stored in advance and the correction value based on the rotation speed of the exhaust air passage determined by the exhaust air passage rotation speed determination means. The supply air path correction value calculation means for calculating the correction value of the rotation speed of the supply air path and the supply air path rotation speed determination means rotate when the supply air path calculated by the target rotation speed calculation means realizes the target air volume. Rotational speed correction means for correcting the number by the correction value is provided, and the rotational speed of the supply air passage is used.

  Thus, the supply air path rotation speed determination means corrects the rotation speed when the supply air path calculated by the target rotation speed calculation means achieves the target air volume with the correction value by the rotation speed correction means to correct the supply air path. By setting the rotation speed, the effect of air leakage from the exhaust air passage side to the air supply air passage side inside the main body can be eliminated, and the target air amount can be secured and the air amount of the air supply and exhaust can be made the same. .

  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.

  The supply air passage 14 is arranged in the order of the outdoor side intake port 5, the supply air damper 22, the heat exchange element 21, the supply air 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 heat exchange element 21, the exhaust fan 19, the exhaust damper 23, and the outdoor discharge port 6.

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

  The control circuit block includes a power supply circuit 27 connected to a commercial power supply 26, and a driving device 28 that drives the DC motor 20, the supply damper 22, and the exhaust damper 23.

  The power supply circuit 27 includes a rectifying / smoothing circuit 29 including a diode bridge and an electrolytic capacitor. Then, the voltage rectified and smoothed by the rectifying and smoothing circuit 29 is dropped through a switching element 30 such as an FET or a switching transformer 31, and a voltage supplied to the DC motor 20 and the driving device 28, 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 32, and a hall element 33 which is a position detection sensor for detecting the position of the rotor. It consists of

  In the present 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 31. However, the present invention is not limited to this.

  For example, the commercial power supply 26 can be driven by high-voltage DC 141 [V] or DC 282 [V] obtained by direct rectification and smoothing.

  The drive device 28 includes a rotation speed detection means 34, a current detection means 35, a damper drive control means 36, and a control means 37.

  The rotation speed detection means 34 detects the rotation speed of the DC motor 20 from the signal from the Hall element 33.

  The current detection means 35 detects the current flowing in the U, V, and W phases of the DC motor 20.

  The damper drive control means 36 drives the motors 24 and 25 of the supply damper 22 and the exhaust damper 23.

  The control means 37 receives the signals from the rotation speed detection means 34 and the current detection means 35 and controls the DC motor drive control means 32 and the damper drive control means 36.

  The current detection means 35 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 36 drives the motors 24 and 25 of the air supply damper 22 and the exhaust damper 23 according to a signal from the control means 37, and adjusts and controls the opening and closing of each damper.

  The control means 37 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 38.

  Next, the structure of the control means 37 is demonstrated using the block diagram of FIG.

  The control means 37 forms a pulse or analog signal and transmits the signal to the DC motor drive control means 32, and the DC motor 20 executes speed control and stop.

  The operation of the control means 37 to be described later is implemented in the form of a program in which the counter, the RAM, and the ROM in the control means 37 cooperate.

  Target air volume control means for controlling the DC motor drive control means 32 and the damper drive control means 36 with respect to the target air volume 39 from the determined target rotational speed of the DC motor 20 and the openings of the supply damper 22 and the exhaust damper 23. 40, and an initial setting means 41 for determining the target rotational speed and the opening degree of the air supply damper 22 and the exhaust damper 23 in the initial start-up of the supply / exhaust type ventilation apparatus 1.

  The initial setting means 41 includes target rotation speed calculation means 42 for calculating the target rotation speed from the target air volume 39, exhaust air path rotation speed determination means 43 for calculating the rotation speed of the exhaust air path 15, and rotation of the supply air path 14. Damper opening degree for determining the opening degree of the supply air passage rotational speed determining means 44 for calculating the number, the target rotational speed determination means 48, and the opening degree of the air supply damper 22 for the air supply air path 14 and the exhaust damper 23 for the exhaust air path 15 respectively. The determination means 45 is provided.

  The target rotational speed calculation means 42 operates the DC motor drive control means 32 to adjust the drive voltage from the relationship between the current flowing through the DC motor 20 and the rotational speed that is the target air volume, and calculates the target rotational speed at that time. It is.

Further, the target rotational speed calculation means 42 has the DC motor 20 necessary for holding a target air volume 39 in the range of the duct length 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 exhaust air passage speed determining means 43 is configured so that the exhaust air passage 15 is brought into a target air volume, for example, 100 [m ³ / m] by the target speed calculating means 42 in a state where the air supply damper 22 is fully closed and the exhaust damper 23 is fully opened. The rotational speed when the air volume h] is realized is detected and used as the rotational speed of the exhaust air passage 15.

The supply air passage rotation speed determination means 44 is a state in which the supply air passage 14 is set to a target air volume, for example, 100 [m ³ / m] by the target rotation speed calculation means 42 in a state where the exhaust damper 23 is fully closed and the supply damper 22 is fully opened. h] is the rotation speed when the air volume is realized.

  The target rotational speed determination means 48 compares the rotational speed of the exhaust air passage 15 and the rotational speed of the air supply air passage 14 and determines the larger rotational speed as the target rotational speed.

  The damper opening degree determining means 45 fully closes the damper of the air passage having the larger rotational speed of the air passages of the exhaust air passage 15 and the supply air passage 14, and the air passage having the smaller rotational speed is the target rotation. The opening degree of the damper of the air passage with the smaller rotational speed is determined so as to be a number.

  In the above configuration, the operation for maintaining the air volume balance between the air supply 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) and the step of determining the rotational speed in the exhaust air path 15 with respect to the target air volume by the exhaust air path speed determining means 43 (STEP 2). The step of determining the rotation speed in the supply air path 14 with respect to the target air volume by the supply air path rotation speed determination means 44 (STEP 3), and the step of determining the target rotation speed by the target rotation speed determination means 48 (STEP 4). And the step (STEP 5) which determines the opening degree of the air supply damper 22 and the exhaust damper 23 by the damper opening degree determination means 45 is comprised. And it is performed in a state in which 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 test operation switch (not shown) is pressed, the control means 37 fully opens the air supply damper 22 and the exhaust damper 23 as shown in STEP 1.

Next, as shown in STEP 2, the exhaust air passage rotational speed determining means 43 controls the damper drive control means 36 to fully close the air supply damper 22 while keeping the exhaust damper 23 fully open. Then, the DC motor 20 is driven by controlling the DC motor drive control means 32 so as to match the relational expression between the current and the rotational speed in the exhaust air passage 15 stored in advance in the target rotational speed calculation means 42. Thereby, one rotation speed N1 can be obtained. This rotational speed N1 is rotational speed information necessary for maintaining a target air volume, for example, 100 [m ³ / h], in the length of the duct 7 actually connected to the exhaust air passage 15.

Next, as shown in STEP 3, the supply air path rotation speed determination unit 44 controls the damper drive control unit 36 to fully open the supply damper 22 and fully close the exhaust damper 23. Then, the DC motor 20 is driven by controlling the DC motor drive control means 32 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 calculation means 42. Thereby, one rotation speed N2 can be obtained. The rotational speed N2 is rotational speed information necessary for maintaining a target air volume, for example, 100 [m ³ / h] when the exhaust damper 23 is fully closed.

  Next, as shown in STEP 4, the target rotational speed determination means 48 compares the rotational speed N 1 determined by the exhaust air path rotational speed determination means 43 with the rotational speed N 2 determined by the supply air path rotational speed determination means 44. The target rotational speed will be determined.

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

  That is, when the rotational speed N1> the rotational speed N2, the air path pressure loss of the exhaust air path 15 is higher than the air path pressure loss of the supply air path 14. If the supply air passage 14 is not adjusted, the air volume of the supply air passage 14 becomes larger than that of the exhaust air passage 15.

  Therefore, the air supply path 14 needs to be able to realize the target air volume with the pressure loss increased again.

  The damper opening determining means 45 adjusts the damper opening in STEP5. The exhaust damper 23 adjusts the angle of the air supply damper 22 connected to the low pressure loss air passage while maintaining the fully closed state. The target rotational speed at this time is the rotational speed N1 of the DC motor 20 determined and calculated in the exhaust air passage 15 determined by the pressure loss of the exhaust air passage 15.

  First, the damper opening degree determining means 45 is a DC motor so as to match the relationship between the current value corresponding to the target rotational speed N1 and the rotational speed in the supply air passage 14 stored in advance in the target rotational speed calculating means 42. 20 and the damper angle of the air supply damper 22 is gradually closed so that the target rotational speed N1 can be maintained.

  Next, as shown in FIG. 5A, the state of the main body 2 stores the angle θ1 of the air supply damper 22 when the operating rotational speed in the air supply air passage 14 becomes N1.

  Then, as shown in FIG. 5B, the exhaust damper 23 is changed from the fully closed state to the fully opened state.

By doing in this way, the air path pressure loss of the supply air path 14 and the exhaust air path 15 can be maintained uniformly. The DC motor 20 can secure a target air volume, for example, 100 [m ³ / h] in both the supply air path 14 and the exhaust air path 15 by being driven at the rotational speed N1.

  The control means 37 controls the supply / exhaust type ventilator 1 on the condition of the angle of the supply air damper 22 adjusted as described above in addition to the condition that the exhaust damper 23 is fully opened and the rotational speed N1. Both the supply air passage 14 and the exhaust air passage 15 secure the target air volume to ventilate the building.

  Further, when the rotational speed N1 <the rotational speed N2, the air path pressure loss of the supply air path 14 is higher than the air path pressure loss of the exhaust air path 15. If the exhaust air passage 15 is not adjusted, the air volume in the exhaust air passage 15 becomes larger than that in the supply air passage 14.

  Therefore, the exhaust air passage 15 needs to be able to realize the target air volume with the pressure loss increased again.

  The air supply damper 22 is fully closed, and the angle of the exhaust damper 23 is adjusted similarly as shown in STEP 5. The target rotational speed at this time is the rotational speed N2 of the DC motor 20 determined and calculated in the supply air passage 14.

  First, the damper opening degree determining means 45 is a DC motor so as to match the relationship between the current value corresponding to the target rotational speed N2 and the rotational speed in the exhaust air passage 15 stored in advance in the target rotational speed calculating means 42. 20 and the damper angle of the exhaust damper 23 is gradually closed so that the target rotational speed N2 can be maintained.

  Next, as shown in FIG. 6A, the state of the main body 2 is stored as the angle θ2 of the exhaust damper 23 when the operating rotational speed in the exhaust air passage 15 becomes N2.

  Then, as shown in FIG. 6B, the air supply damper 22 is changed from the fully closed state to the fully opened state.

By doing in this way, the air path pressure loss of the supply air path 14 and the exhaust air path 15 can be maintained uniformly. The DC motor 20 can secure a target air volume, for example, 100 [m ³ / h] in both the supply air path 14 and the exhaust air path 15 by being driven at the rotation speed N3.

  The control means 37 controls the supply / exhaust type ventilator 1 on the condition of the angle of the exhaust damper 23 adjusted as described above in addition to the condition that the supply damper 22 is fully opened and the rotational speed N2. Both the supply air passage 14 and the exhaust air passage 15 secure the target air volume to ventilate the building.

  Further, when the rotational speed N1 = the rotational speed N2, the air path pressure loss of the supply air path 14 and the exhaust air path 15 is already equal.

In this case, both the air supply damper 22 and the exhaust damper 23 are fully opened, and the DC motor 20 is driven at the rotational speed N1. As a result, a target air volume, for example, an air volume of 100 [m ³ / h] can be secured together with the supply air path 14 and the exhaust air path 15.

  As described above, in the first embodiment of the present invention, the pressure loss difference between the two can be eliminated by adjusting the damper angle with the lower pressure loss.

  As a result, even when the DC motor 20 is driven at a single rotational speed, it is possible to ensure the air volume of both the supply air and the exhaust air and at the same time keep the air volume balance between the supply air and the exhaust air.

  Further, among the rotation speed results detected by the exhaust air path rotation speed determination means 43 and the supply air path rotation speed determination means 44, the damper connected to the air flow path that detects the higher rotation speed is fully opened. I made it.

  Thereby, the energy loss of the DC motor 20 caused by closing the damper can be reduced by adjusting the opening area of only the damper having the lower airway pressure loss.

  The above flow is executed only when the power is turned on or when a test operation switch (not shown) is operated. Therefore, the damper does not need to be fully closed during normal use, and the user does not feel discomfort due to noise generated when the damper is fully closed.

  In addition, even if the target air flow or the balance between air supply and exhaust air is not uniform due to remodeling or clogging of the equipment, the user can set any arbitrary value by turning on the power or operating the test run switch (not shown). It can also be reset at the timing.

(Embodiment 2)
As described above, the first embodiment has explained that the angle of the damper is adjusted in order to achieve the target air volume with high accuracy.

  4, the exhaust air passage rotational speed determination means 43 controls the damper drive control means 36 to fully close the supply damper 22 while keeping the exhaust damper 23 fully open.

  Then, the DC motor 20 is driven by controlling the DC motor drive control means 32 so as to match the relational expression between the current and the rotational speed in the exhaust air passage 15 stored in advance in the target rotational speed calculation means 42.

  At this time, the exhaust damper 23 is fully closed to obtain one rotation speed N1 on the supply air passage 14 side. However, air leaks from the exhaust air passage 15 to the supply air passage 14, and the supply air passage 14 Since the air volume due to this leakage is added, the air volume that can be supplied from the outside may be insufficient.

  The cause of air leakage is caused by manufacturing variations of the supply / exhaust type ventilation device 1, for example, gaps in the joint between the main body 2 and the partition plate 16 shown in FIG. I think.

  That is, in order to realize the target air volume with high accuracy, it is necessary to increase the rotational speed.

  Therefore, in the present embodiment, the initial setting means 41 includes a supply air path correction rotation speed determination means 49 instead of the supply air path rotation speed determination means 44 of the first embodiment.

  The supply air path correction rotation speed determination means 49 supplies the air flow from the relationship between the rotation speed of the exhaust air path 15 stored in advance and the correction value based on the rotation speed of the exhaust air path 15 calculated by the exhaust air path rotation speed determination means 43. The supply air path correction value calculation means 50 for calculating the correction value of the rotation speed of the air flow path 14 and the rotation speed of the supply air path 14 when the supply air path 14 calculated by the target rotation speed calculation means 42 realizes the target air volume. Is provided with a rotation speed correction means 51 for correcting the above-mentioned value by the correction value.

  The configuration of the control means 37 will be described with reference to the block diagram of FIG. The control means 37 controls the DC motor drive control means 32 and the damper drive control means 36 with respect to the target air volume 39 from the determined target rotational speed of the DC motor 20 and the opening degrees of the supply damper 22 and the exhaust damper 23. And an initial setting means 41 for determining the target rotational speed and the opening degree of the air supply damper 22 and the exhaust damper 23 at the initial startup of the supply / exhaust type ventilation device 1.

  The initial setting means 41 includes target rotation speed calculation means 42 for calculating the target rotation speed from the target air volume 39, exhaust air path rotation speed determination means 43 for calculating the rotation speed of the exhaust air path 15, and rotation of the supply air path 14. Supply air path correction rotation speed determination means 49 for calculating the number, target rotation speed determination means 48, damper opening degree for determining the opening degree of the supply air damper 22 and the exhaust damper 23 of the supply air path 14 and the exhaust air path 15 The determination means 45 is provided.

  The supply air path correction rotation speed determination means 49 corrects and stores the rotation speed of the exhaust air path 15 stored in advance shown in FIG. 8 based on the rotation speed of the exhaust air path 15 calculated by the exhaust air path rotation speed determination means 43. From the relationship of values, an air supply air path correction value calculation means 50 for calculating a correction value of the rotation speed of the air supply air path 14 and a speed correction means 51 which is corrected by the correction value to obtain the rotation speed of the air supply air path 14 are provided. It is provided. For example, as shown in FIG. 8, when the rotation speed calculated by the exhaust air path rotation speed determination means 43 is N1_2, the correction value of the supply air path 14 is set to 1.04.

  The target rotational speed calculation means 42 operates the DC motor drive control means 32 to adjust the drive voltage from the relationship between the current flowing through the DC motor 20 and the rotational speed that is the target air volume, and calculates the target rotational speed at that time. It is.

  The target rotational speed determination means 48 compares the rotational speed of the exhaust air passage 15 and the rotational speed of the air supply air passage 14 and determines the larger rotational speed as the target rotational speed.

  In the above configuration, the operation for maintaining the air volume balance between the air supply 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) and the step of determining the rotational speed in the exhaust air path 15 with respect to the target air volume by the exhaust air path speed determining means 43 (STEP 2). The step of determining the rotation speed in the supply air path 14 with respect to the target air volume by the supply air path rotation speed determination means 44 (STEP 3), and the step of determining the target rotation speed by the target rotation speed determination means 48 (STEP 4). And the step (STEP 5) which determines the opening degree of the air supply damper 22 and the exhaust damper 23 by the damper opening degree determination means 45 is comprised.

  After the power is turned on or when the test operation switch is pressed, the control means 37 fully opens the air supply damper 22 and the exhaust damper 23 as shown in STEP 1.

  Next, as shown in STEP 2, the exhaust air passage rotation speed determination means 43 controls the damper drive control means 36 to hold the exhaust damper 23 in a fully open state and to fully close the air supply damper 22.

  Then, the DC motor drive control unit 32 is controlled to drive the DC motor 20 so as to match the relational expression between the current and the rotation number in the exhaust air passage 15 stored in the target rotation number calculation unit 42 in advance. One rotation speed N1 is obtained.

  Then, the supply air path correction value calculation means 50 calculates the correction value Rh1 of the rotation speed of the supply air path 14 from the rotation speed N1 of the exhaust air path 15 determined by the exhaust air path rotation speed determination means 43.

  Next, as shown in STEP 3, the supply air path rotation speed determination means 44 controls the damper drive control means 36 so that the supply air damper 22 is fully opened and the exhaust damper 23 is fully closed.

  Then, by driving the DC motor 20 by controlling the DC motor drive control means 32 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 calculation means 42, One rotation speed N2 is obtained.

  Then, the rotational speed correction means 51 determines a correction value Rh1 in STEP2 according to the rotational speed on the exhaust side, and multiplies the rotational speed N2 to obtain the rotational speed N3.

This rotational speed N3 is the rotational speed information necessary for maintaining a target air volume, for example, 100 [m ³ / h] with the exhaust damper 23 opened in the working duct length connected to the supply air passage 14. It is.

  Next, as shown in STEP 4, the target rotational speed determination means 48 compares the rotational speed N 1 determined by the exhaust air path rotational speed determination means 43 with the rotational speed N 3 determined by the supply air path rotational speed determination means 44. The target rotational speed will be determined.

  That is, when the rotational speed N1> the rotational speed N3, the rotational speed N1 is set as the target rotational speed. If the rotation speed N1 <the rotation speed N3, the rotation speed N3 is set as the target rotation speed. Further, when the rotational speed N1 = the rotational speed N3, the rotational speed N1 is set as the target rotational speed.

  Then, in STEP 5, the damper opening degree determining means 45 adjusts the damper opening degree. That is, when the rotational speed N1> the rotational speed N3, the air path pressure loss of the exhaust air path 15 is higher than the air path pressure loss of the supply air path 14. If the supply air passage 14 is not adjusted, the air volume of the supply air passage 14 becomes larger than that of the exhaust air passage 15.

  Therefore, the air supply path 14 needs to be able to realize the target air volume with the pressure loss increased again.

  The exhaust damper 23 adjusts the angle of the air supply damper 22 connected to the low pressure loss air passage while maintaining the fully closed state. The target rotational speed at this time is the rotational speed N1 of the DC motor 20 determined and calculated in the exhaust air passage 15 determined by the pressure loss of the exhaust air passage 15.

  Then, the DC motor 20 is controlled so that the relationship between the current value corresponding to the target rotational speed N1 and the rotational speed in the supply air passage 14 stored in advance in the target rotational speed calculating means 42 matches the target rotational speed N1, and the target rotational speed N1 is set. The damper angle of the supply air damper 22 is gradually closed so as to be maintained.

  Further, when the rotational speed N1 <the rotational speed N3, the air path pressure loss of the supply air path 14 is higher than the air path pressure loss of the exhaust air path 15. If the exhaust air passage 15 is not adjusted, the air volume in the exhaust air passage 15 becomes larger than that in the supply air passage 14.

  Therefore, the exhaust air passage 15 needs to be able to realize the target air volume with the pressure loss increased again.

  The supply damper 22 is fully closed, and the angle of the exhaust damper 23 is adjusted. The target rotational speed at this time is the rotational speed N3 of the DC motor 20 determined and calculated in the supply air passage 14. Then, the DC motor 20 is controlled to match the relationship between the current value corresponding to the target rotational speed N3 and the rotational speed in the exhaust air passage 15 stored in advance in the target rotational speed calculating means 42, and the target rotational speed N3. So that the damper angle of the exhaust damper 23 is gradually closed.

Next, in the case of N1 = N3, since the air path pressure loss of the supply air path 14 and the exhaust air path 15 is already equal, both the air supply damper 22 and the exhaust damper 23 are fully opened, and the DC motor 20 is rotated at the rotational speed. By driving at N1, it is possible to secure a target air volume, for example, 100 [m ³ / h], together with the supply air path 14 and the exhaust air path 15.

  As described above, air leakage between the supply air passage 14 and the exhaust air passage 15 is corrected and corrected, and by adjusting the damper angle with the lower pressure loss, a structure in which airflow leakage occurs inside the main body 2. Also, the pressure loss of both is equal, and the DC motor 20 is driven at one rotational speed, and the air volume of both the supply air and the exhaust air can be ensured while the air volume balance between the supply air and the exhaust air is kept uniform.

  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, and is used simultaneously in general houses and the like. 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 Supply fan 19 Exhaust fan 20 DC motor 21 Heat exchange element 22 Supply air damper 23 Exhaust damper 24 Electric motor 25 Electric motor 26 Commercial power supply 27 Power supply circuit 28 Drive device 29 Rectification smoothing circuit DESCRIPTION OF SYMBOLS 30 Switching element 31 Switching transformer 32 DC motor drive control means 33 Hall element 34 Rotation speed detection means 35 Current detection means 36 Damper drive control means 37 Control means 38 Regulator 39 Target air volume 40 Target air volume control means 41 Initial setting means 42 Target rotation speed Calculation means 43 Exhaust air passage rotation speed Determination means 44 Supply air path rotation speed determination means 45 Damper opening determination means 48 Target rotation speed determination means 49 Supply air path correction rotation speed determination means 50 Supply air path correction value calculation means 51 Speed correction means 100 Main body 101 For air supply DC motor equipped with a fan 102 DC motor equipped with an exhaust fan 104 Control device

Claims (2)

An indoor suction port disposed in front of the main body, an indoor discharge port disposed on one side surface, an outdoor suction port and an outdoor discharge port disposed on a surface different from the side surface, and an opening of the outdoor suction port An air supply damper that adjusts the area, an exhaust damper that adjusts the opening area of the outdoor discharge port, an air supply passage that communicates outdoor air from the outdoor suction port to the indoor discharge port, and indoor air An exhaust air passage that communicates from the indoor suction port to the outdoor discharge port, and a heat exchange element that is arranged at the intersection of the supply air passage and the exhaust air passage to exchange heat between outdoor air and indoor air A supply blade and an exhaust blade disposed on the leeward side of the heat exchange element, respectively, and the supply blade and the exhaust blade are driven by a single drive shaft. DC motor, the supply damper and the exhaust Damper drive control means for driving the drive, DC motor drive control means for adjusting the drive voltage of the DC motor, current detection means for detecting the current flowing through the DC motor, and rotation for detecting the rotational speed of the DC motor Control for controlling the drive voltage to the DC motor so that the number of detecting means, one of the air supply damper and the exhaust damper is fully open, and the other damper is adjusted to the target rotational speed by adjusting the opening degree. The control means includes an initial setting means for determining a target rotational speed of the DC motor and openings of the supply damper and the exhaust damper with respect to a target air volume. The initial setting means operates the DC motor drive control means to adjust the drive voltage from the relationship between the current flowing in the DC motor and the rotation speed to reach the target air volume, and calculates the target rotation speed at that time And a target rotational speed when the exhaust air passage realizes the target air volume by the target rotational speed calculating means in a state where the supply damper is fully closed and the exhaust damper is fully opened. The exhaust air passage speed determining means for detecting the exhaust air passage rotational speed and the exhaust air damper being fully closed with the exhaust damper fully closed and the supply air damper being fully open, A supply air passage rotation speed determination means that detects the rotation speed when realizing the target air volume and sets the rotation speed of the supply air passage, and compares the rotation speed of the exhaust air passage with the rotation speed of the supply air passage. And a target rotational speed determining means for determining the larger rotational speed as the target rotational speed, and a damper opening determining means for determining the opening degree of the damper of the exhaust air passage and the supply air passage. Of the air supply air passages, the one with the higher rotation speed A supply / exhaust type ventilator, wherein the damper is fully closed, and the opening degree of the damper of the air passage with the smaller rotational speed is adjusted so that the air passage with the smaller rotational speed becomes the target rotational speed . The initial setting means is a correction value for the rotation speed of the air supply air passage based on the relationship between the rotation speed of the exhaust air passage stored in advance and the correction value based on the rotation speed of the exhaust air passage determined by the exhaust air passage rotation speed determination means. The supply air path rotation speed determination means corrects the rotation speed when the supply air path calculated by the target rotation speed calculation means achieves the target air volume with the correction value. 2. The supply / exhaust type ventilator according to claim 1, further comprising a rotation speed correction means, wherein the rotation speed corrected by the rotation speed correction means is set as the rotation speed of the supply air passage.

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