JP2015083889A - Ventilation device and ventilation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation device capable of controlling exhaust of a given air volume with a simple configuration and without using a special sensor, and further to provide a ventilation system.SOLUTION: A controller 14 is accommodated in a control box 5. A small hole 10a is provided on a casing 10 with which a terminal portion of an exhaust side of a guide vane 13 is brought into contact. A pressure of the air transmitted through the small hole 10a of the casing 10 can be detected by disposing a segment 15a curved by receiving a wind blown from the small hole 10a and an electrostatic touch electrode 15 on a substrate of the controller 14 at positions adjacent to each other. The controller 14 is configured so as to control a rotation speed of a fan 9 such that the pressure of the air transmitted through the small hole 10a obtained by converting an electrostatic capacitance capable of being detected from the electrostatic touch electrode 15 is a predetermined value. Accordingly, a ventilation device which maintains an air volume discharged from an exhaust port 12 at a given volume with a simple configuration and without using a special sensor can be obtained.

Description

  The present invention relates to a ventilation device and a ventilation system that realize exhaust of a constant air volume regardless of the length of a pipe.

  In recent years, ventilators equipped with a DC motor capable of controlling the number of revolutions capable of fine air volume control have been developed. Since such a ventilator is affected by the length of the duct and the outside air pressure, the air volume fluctuates, so a method for controlling the air volume to a constant air volume, for example, as shown in Patent Documents 1 to 3, has been proposed. Yes.

  In Patent Document 1, the entire ventilation air volume is set by the exhaust side of the blower. A pressure sensor for detecting the wind pressure is provided on the exhaust side of the blower, and the air blower is controlled by the control circuit from the pressure detected by the pressure sensor. It is something to control.

  The thing shown in patent document 2 is equipped with the pressure sensor which detects the pressure difference of the upstream of an intake air path, and a downstream side that the thing shown in patent document 1 is difficult to respond | correspond to size reduction of a pressure sensor or a control circuit. The blower is controlled so that the pressure difference detected by the pressure sensor matches a preset target value, and a mounting surface is formed on a part of the intake structure, and the pressure difference is detected on the mounting surface. And a control box containing a control circuit and a pressure sensor is attached to the mounting surface.

  In addition, what is disclosed in Patent Document 3 is an apparatus in which a control circuit measures a characteristic value of a DC motor without using a sensor to estimate an air volume, thereby controlling the DC motor to ensure a predetermined air volume. is there.

JP-A-1-239330 Japanese Patent No. 3399140 Japanese Patent Laid-Open No. 2003-143887

  In such a conventional system, the pressure sensor uses a so-called differential pressure sensor among the pressure sensors, and the pressure sensor is expensive, and the mounting structure of the pressure sensor is complicated. is there.

  In addition, the method of using the DC motor characteristic value for air volume estimation is to obtain the motor characteristic value by experiment and store the data in a storage device (ROM) such as a microcomputer. There was a problem that required time and therefore the development period was long.

  Therefore, the present invention solves the above-described conventional problems, and an object of the present invention is to provide a ventilation device and a ventilation system that can control exhaust of a constant air volume with a simple structure without using a sensor.

  In order to achieve this object, the ventilator of the present invention includes a casing having an inlet and an outlet, a fan motor equipped with a fan housed in the casing, and a control device for driving the fan motor. In the ventilation device, the casing is provided with a small hole for communicating the inside of the guide vane of the fan motor with the outside of the casing, and the control device is provided on an outer wall surface of the casing so as to cover the small hole. And a speed control means for controlling the rotational speed of the fan motor, an electrode capable of detecting a capacitance facing the small hole, and the small hole so as to block between the electrode and the small hole. A section curved by the pressure of air transmitted from the hole is provided inside, and the control device transmits from the small hole converted from the capacitance detected by the electrode. The ventilator is characterized in that the air volume discharged from the exhaust port is kept constant by controlling the rotational speed of the fan motor so that the air pressure becomes a predetermined value. It achieves its purpose.

  In order to achieve this object, the ventilation system of the present invention includes a casing having an inlet and an outlet, a fan motor equipped with a fan accommodated in the casing, a control device for driving the fan motor, and the exhaust. A ventilation system comprising an exhaust duct connected to a mouth, wherein the exhaust duct is provided with a communication hole, and the control device includes a box attached to an outer wall surface of the exhaust duct so as to cover the communication hole. And a speed control means for controlling the rotational speed of the fan motor, wherein the box includes a small hole having a smaller diameter than the communication hole, and an electrode capable of detecting a capacitance directly facing the small hole; A section curved by the pressure of the air transmitted from the hole, and installed on the outer wall of the exhaust duct so that the small hole and the communication hole overlap with each other. The amount of air discharged from the exhaust port is kept constant by controlling the rotational speed of the fan motor so that the pressure of the air transmitted from the small hole converted from the known capacitance becomes a predetermined value. This is a ventilation system, which achieves the intended purpose.

  According to the present invention, the configuration is such that the pressure of the air transmitted from the small hole is detected by converting it into a capacitance with the electrode, so that ventilation with stable exhaust airflow with a simple structure without using a special sensor. The effect that a device and a ventilation system can be provided can be obtained.

External view of ventilation apparatus of Embodiment 1 of the present invention The figure which shows the attachment state of the ventilation device Sectional plan view showing the structure ((a) plan view, (b) enlarged view of C) The figure which shows the electrical structure ((a) The figure which shows an electrical structure, (b) The detailed figure of an example of the conversion circuit of an electrostatic touch electrode) The figure which shows an example of the principle in which an electrostatic touch electrode detects an electrostatic capacitance The figure which shows an example of the change of the detected value of the electrostatic capacitance of an electrostatic touch electrode. Diagram showing the relationship between duct length, static pressure and air volume The figure which shows the voltage which is remembered in the memory of the same CPU Flow chart showing operation of air volume control of the control device The figure which shows the structure of Embodiment 2 of this invention ((a) Top view, (b) Enlarged view of D) The figure which shows the structure of Embodiment 3 of this invention ((a) Top view, (b) Enlarged view shown by E, (c) Enlarged perspective view shown by E)

  Invention of Claim 1 of this invention is a ventilation apparatus provided with the fan motor which mounted | wore with the casing which has the inlet and the exhaust port, the fan accommodated in the said casing, and the said fan motor, The casing is provided with a small hole for communicating the inside of the guide vane of the fan motor with the outside of the casing, and the control device is attached to the outer wall surface of the casing so as to cover the small hole, and the fan Speed control means for controlling the rotation speed of the motor, an electrode that can detect the capacitance directly facing the small hole, and the pressure of air transmitted from the small hole so as to block between the electrode and the small hole In addition, the control device has a section in which the pressure of the air transmitted from the small hole converted from the capacitance detected by the electrode becomes a predetermined value. A ventilator, characterized in that to maintain constant the volume of air discharged from the exhaust port by controlling the rotational speed of the fan motor as. As a result, the air volume can be controlled at low cost.

  According to a second aspect of the present invention, in the ventilator according to the first aspect, the small hole is provided at a position of the casing substantially opposite to a direction of the exhaust flow generated by the rotation of the fan. The ventilator is characterized in that the wind speed of the air discharged from the small hole is increased, and the difference in the detected amount is increased, so that the air volume control can be performed stably.

  According to a third aspect of the present invention, in the ventilator according to the first aspect, the small hole is provided at a position of the casing perpendicular to the direction of the exhaust flow generated by the rotation of the fan. The ventilator is characterized in that the static pressure can be accurately measured without the influence of dynamic pressure, and the air volume control can be performed with high accuracy.

  According to a fourth aspect of the present invention, there is provided a casing having an intake port and an exhaust port, a fan motor equipped with a fan accommodated in the casing, a control device for driving the fan motor, and an exhaust duct connected to the exhaust port. The exhaust duct is provided with a communication hole, and the control device includes a box attached to an outer wall surface of the exhaust duct so as to cover the communication hole, and a rotation of the fan motor. The box includes a speed control means for controlling the speed, the box has a small hole having a smaller diameter than the communication hole, an electrode capable of detecting a capacitance directly facing the small hole, and a pressure of air transmitted from the small hole And is installed on the outer wall of the exhaust duct so that the small hole and the communication hole overlap, and the control device converts the capacitance from the capacitance detected by the electrode. The pressure of the air transmitted from the small holes are ventilation system characterized by keeping constant the volume of air discharged from the exhaust port by controlling the rotational speed of the fan motor to a predetermined value. As a result, the effect of turbulent flow due to the rotation of the fan can be almost eliminated and the static pressure can be detected, and the air volume control can be performed with high accuracy.

  According to a fifth aspect of the present invention, in the ventilating apparatus according to the fourth aspect, the box is accommodated in a diameter of a communication hole that accommodates the section in the vicinity of the small hole of the box and opens the exhaust duct. The box is attached to the exhaust duct so that all the diameters of the small holes can enter.

  As a result, the wind speed can be defined by a small hole in the box, and the small hole in the exhaust duct only needs to be opened to a large size, and the workability on site can be improved.

  According to a sixth aspect of the present invention, in the ventilator according to any one of the first to third aspects, the control device includes a duct length setting means, and the small hole converted from the capacitance detected by the electrode. The ventilator corrects the predetermined value for controlling the number of rotations of the fan motor so that the pressure of air transmitted from the fan reaches a predetermined value. The ventilator is characterized in that the ventilator is installed at a place where the ventilator is installed. The effect of eliminating the error due to the effect of the duct length and controlling the air flow with high accuracy is achieved.

  According to a seventh aspect of the present invention, in the ventilation system according to the fourth or fifth aspect, the control device includes a duct length setting means, and the air transmitted from the small hole converted from the capacitance detected by the electrode. The ventilator is characterized in that the predetermined value for controlling the rotational speed of the fan motor is corrected by a duct length so that the pressure becomes a predetermined value, and the influence of the duct length of the place where the ventilator is installed There is an effect that the airflow control can be performed with high accuracy by eliminating the error due to.

  According to an eighth aspect of the present invention, in the ventilator according to any one of the first to third or sixth aspects, the control device includes a temperature correction thermistor, and the pressure value converted from the capacitance detected by the electrode is used. It is a ventilator that corrects with the ambient temperature detected by the temperature correction thermistor, corrects the change of air density due to the change of temperature, eliminates the error due to the influence of the driving season, etc., and can accurately control the air volume There is an effect.

  According to a ninth aspect of the present invention, in the ventilation system according to the fourth or fifth aspect, the control device includes a temperature correction thermistor, and a pressure value converted from a capacitance detected by the electrode is set in the temperature correction thermistor. It is a ventilator characterized by correcting with the ambient temperature to be detected, and has the effect of correcting the change in the air density due to the change in the air temperature, eliminating the error due to the influence of the driving season, etc., and performing the air volume control with high accuracy.

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

(Embodiment 1)
FIG. 1 is an external view of a ventilation device and a ventilation system.

  FIG. 1 shows a state (ventilation system) in which a ventilator 1 is connected to a plurality of intake boxes 2 by respective intake ducts 3 and an exhaust duct 4 is connected.

  The control box 5 is provided outside the ventilation device 1 and houses a control device 14 described later.

  FIG. 2 is a view showing a state where the ventilation device 1 of FIG. 1 is attached to the ceiling 102 of the building. As shown in FIG. 2, the ventilation device 1 and the intake box 2 are attached to the beam 101 in a suspended state. The lower end of the intake box 2 passes through the ceiling 102 and is covered with the intake grill 6. The tip of the exhaust duct 4 passes through the wall 103 and is covered with the exhaust grill 7.

  When the fan 9 attached to the fan motor 8 rotates, an air flow is generated in the intake grill 6, the intake box 2, the intake duct 3, the fan 9, the exhaust duct 4, and the exhaust grill 7 as indicated by arrows, and the air in the building is It is discharged outdoors.

  Fig.3 (a) is a figure which shows the structure of a ventilator, and is sectional drawing which looked at the ventilator of FIG. 2 from the lower surface (AB view).

  The ventilation device 1 includes a casing 10 that is an outline of a main body, a fan motor 8 in which a fan 9 is mounted in the casing 10, and a control device 14 that drives the fan motor 8.

  The casing 10 is provided with three intake ports 11 and an exhaust port 12. The fan 9 is a centrifugal blower provided with a scroll casing, and a guide vane 13 serving as a part of the scroll casing is provided around the fan 9. Then, when the fan 9 rotates in the direction of the arrow, the air sucked from the intake port 11 is discharged from the exhaust port 12. The control device 14 is accommodated in a control box 5 provided at a corner portion outside the casing 10.

  In addition, the control box 5 communicates with a part of the exhaust air flow path on the downstream side of the fan 9. That is, the inside of the control box 5 communicates with the exhaust air passage in the scroll casing through the small hole 10 a provided in the casing 10. That is, the control box 5 is attached so as to cover the small hole 10 a from the outside of the casing 10. Note that the end portion of the guide vane 13 may be joined to the casing 10, and a small hole 10 a may be provided in the joining portion so as to penetrate the guide vane 13 and the casing 10.

  On the substrate of the control device 14, an electrostatic touch electrode 15 configured by a copper foil pattern on the printed circuit board 15 b is provided at a position almost directly facing the small hole 10 a. Further, in the control box 5, a section 15a is provided at a position almost facing the small hole 10a so as to block the electrostatic touch electrode 15 and the small hole 10a. The slice 15a is a conductor having a size that substantially covers the electrostatic touch electrode 15, and is a metal flat plate as an example. The section 15a is fixed to the side wall of the control box 5 in FIG. 3, and is configured to bend in the direction of the electrostatic touch electrode 15 by the pressure of air transmitted from the small hole 10a. For the convenience of processing, the effect is the same even if the section 15a is fixed to the casing 10 in an L shape. As will be described in detail later, the control device 14 controls the rotational speed of the fan motor 8 so that the pressure of the air transmitted from the small hole 10a converted from the capacitance detected by the electrostatic touch electrode 15 becomes a predetermined value. Speed control means 23 is provided.

  FIG. 3B is an enlarged view of a portion indicated by C in FIG. 3A, that is, a corner portion of the casing 10 and the control box 5. As shown in FIG. 3, a small hole 10 a having a desired diameter is provided in the casing 10 with which the end portion on the exhaust side of the guide vane 13 abuts. The small hole 10 a is opened so as to face the exhaust flow blown out from the fan motor 8. That is, the exhaust flow blows into the small holes 10a along the flow. The section 15a provided at a position almost facing the small hole 10a is sufficiently separated from the electrostatic touch electrode 15 when the fan motor 8 is not rotating. On the other hand, when the fan motor 8 rotates, the slice 15a is bent by the pressure p of the wind blown from the small hole 10a and approaches the electrostatic touch electrode 15. That is, the slice 15a is made of a curved material. Here, the electrostatic touch electrode 15 can detect, as an analog value, a change in electrostatic capacitance caused by the section 15a being bent by the pressure p and approaching the electrostatic touch electrode 15. An example of the principle and configuration will be described later.

  Here, the pressure p is a dynamic pressure and has a correlation with the exhaust air volume Q, and a substantially proportional relationship is obtained. Further, there is a correlation between the pressure p and the bending amount of the segment 15a, and there is also a correlation with the capacitance value when the segment 15a is bent and approaches the electrostatic touch electrode 15. From this relationship, the capacitance value detected by the electrostatic touch electrode 15 is uniquely correlated with the exhaust air volume. If the capacitance value of the electrostatic touch electrode 15 can be detected, the pressure can be detected and the exhaust air volume can be reduced. You can control it.

  A duct length setting means 26 and a temperature correction thermistor 16 are also mounted on the control device 14. The duct length setting means 26 may be set as a combination such as a dip switch or may be set as an analog like a volume.

  FIG. 4A is a diagram illustrating an electrical configuration of the control device 14.

  In recent years, electrostatic touch key switches have been widely used due to the design requirements of home appliances, and a circuit that can control electrostatic touch key switches from a configuration that uses a conventional IC dedicated to electrostatic touch key switches. In addition, a configuration using a microcomputer incorporating software is increasing, and this configuration can be the simplest and cheapest configuration. An electrostatic touch key switch is a switch in which an electrostatic touch electrode is touched with a finger. There are various methods for detecting the electrostatic touch electrode in both the dedicated IC and the microcomputer. Here, an example of a microcomputer for detecting the electrostatic touch electrode will be described.

  The control device 14 connected to the fan motor 8 energizes the resistor 18 connected to the temperature correction thermistor 16 with the power source 19 and converts the voltage across the temperature correction thermistor 16 into a digital value by the A / D converter 21. And input to the CPU 22a (central processing unit such as a microcomputer). The electrostatic touch electrode 15 formed of a copper foil pattern on the printed circuit board 15b of the control device 14 and the input port of the TCU (touch key control unit) 20 of the microcomputer 22 are electrically connected. The capacitance is converted into a digital value and used as an input to the CPU 22a. The speed control means 23 is connected as an output of the CPU 22a, and the air volume setting switch 24 and the duct length setting means 26 are connected as inputs of the CPU 22a.

  Here, as the speed control means 23, for example, a pulse width modulation (PWM) speed adjusting device is used.

  FIG. 4B is a diagram showing an example of the configuration of the conversion circuit of the electrostatic touch electrode 15 in detail.

  Capacitors Cr, Cc and resistor Rc are external components necessary for operating TCU 20, and resistor Rr is a protective resistor that protects port CH0 from static electricity and the like. In addition, the electrostatic touch electrode 15 has a stray capacitance Cx between a surrounding conductor (a substrate pattern, a metal casing, or ground (earth)) even when there is nothing around, and the TCU 20 is electrostatically charged. The stray capacitance of the touch electrode 15 is measured.

  FIG. 5 is a diagram illustrating an example of the principle by which the electrostatic touch electrode detects the capacitance.

の関係が成り立つ。ここで静電タッチ電極１５に指などの導体を近づけると、導体の持つ浮遊容量がＣｘに加わることになり、静電タッチ電極１５の浮遊容量Ｃｘが増加することになる。この時電圧Ｖａは低下することになり、この電圧の変化をＣＨｘＡで計測すれば、浮遊容量Ｃｘの変化量がデジタル値で得られることになる。このデジタル値への変換の方式も各社各様である。 As a function of the TCU 20, first, the ports CHxA and CHxB of the microcomputer 22 are disconnected, and the capacitor Cc is charged to the voltage Vc by CHxC. Next, when the port CHxC is disconnected and CHxA and CH0 to be measured are connected, the circuit is divided in voltage.

The relationship holds. When a conductor such as a finger is brought close to the electrostatic touch electrode 15 here, the stray capacitance of the conductor is added to Cx, and the stray capacitance Cx of the electrostatic touch electrode 15 is increased. At this time, the voltage Va decreases, and if the change in voltage is measured by CHxA, the amount of change in the stray capacitance Cx can be obtained as a digital value. Each company also has a method for converting this digital value.

  FIG. 6 is a diagram illustrating an example of a change in the measured value T of the capacitance of the electrostatic touch electrode 15.

  The figure shows an example of an electrostatic touch key switch. When the user touches the key switch portion with a finger, a change appears in the measured value T with time, and it can be detected that an attempt is made to press the switch. In the first embodiment, the measurement value T in a changing state indicated by an arrow in which the segment 15a approaches or leaves the electrostatic touch electrode 15 is used.

  As shown in the first embodiment, the function built in the commercially available microcomputer can be used and wiring can be performed with the wiring pattern of the substrate without preparing a special sensor. Therefore, the ventilation device and the ventilation system can be configured with a very simple configuration. An air volume control device can be provided.

FIG. 7 is a diagram showing PQ characteristics of a general ventilation device. The load curve for each duct length in the figure shows that the load varies greatly depending on the length of the exhaust duct 4. The piping diameter of the exhaust duct 4 is uniformly determined in terms of construction from the size of the exhaust port 12. Here, if the length of the exhaust duct 4 is 10 m or less, which is a general duct length, for example, when trying to obtain 400 m ³ / h, an approximate air volume can be obtained if a predetermined pressure is 25 Pa. However, if the duct length reaches 25 m, 400 m ³ / h cannot be obtained unless the predetermined pressure is set to 80 Pa in consideration of the duct length.

  FIG. 8 is a diagram showing the air volume setting stored in the internal memory (ROM) of the CPU 22 and the stray capacitance (predetermined value) of the electrostatic touch electrode 15 corresponding to the set air volume.

For example, when the air volume setting switch 24 is set to be weak (V ₁ ) and the ambient temperature is 25 ° C., it indicates that the predetermined value serving as the target value of the stray capacitance of the electrostatic touch electrode 15 is T ₁ . Furthermore, provided the same information table for each duct length setting value set from the duct length setting means 26, changing reading a predetermined value T ₁ which is a target value of the stray capacitance of the electrostatic touch electrode 15 in accordance with the duct length be able to.

  Next, the air volume control operation of the control device 14 will be described with reference to FIG.

In S1 (step 1), the control device 14 reads the set value of the air volume setting switch 24 with a voltage, for example, reads a weak (V ₁ ) of the duct length of 5 m in FIG. Read ambient temperature, eg 25 ° C. From this two settings, predetermined value T ₁ which is a target value of the stray capacitance of the electrostatic touch electrode 15 described in FIG. 8 step S3 is obtained.

Next, in S4, the set value of the duct length described in FIGS. 7 and 8 is read from the duct length setting means 26, for example, a duct length of 10 m is obtained. The predetermined value T ₁ is read as, for example, T ₁₀ from the information table adjusted to the duct length of 10 m.

Next, in S5, the stray capacitance of the electrostatic touch electrode 15, i.e., by comparing the value T to TCU20 detects the predetermined value T _10, T <If T ₁₀ sections 15a is too far from the electrostatic touch electrode 15 Therefore, the fan motor 8 is accelerated (S6), and the segment 15a is brought closer to the electrostatic touch electrode 15. Next, sections 15a if T> T ₁₀ at S7 is because it is too close to the electrostatic touch electrode 15, decelerates the fan motor 8 (S8) away sections 15a from the electrostatic touch electrode 15.

  The above operation is performed in the form of a CPU program in which the RAM and ROM in the CPU 22a work together.

  Such an operation is repeated and the pressure p is kept constant by the electrostatic touch electrode 15. As described above, since the pressure p and the exhaust air volume Q of the ventilation device 1 are correlated, the exhaust air volume Q is kept constant by keeping the pressure p constant.

  As described above, from the movement of the segment 15a installed outside the small circular hole 10a having a diameter of about 1 mm provided in the portion constituting the exhaust passage of the casing 10 and the stray capacitance of the electrostatic touch electrode 15, By controlling the rotational speed of the fan motor 8 so that the pressure p transmitted from the small hole 10a detected by the computer becomes a predetermined value, the amount of exhaust air discharged from the exhaust port 12 can be kept constant.

(Embodiment 2)
Since this embodiment is the same except for FIG. 3 in FIGS. 1 to 9 described in the first embodiment, FIG. 10 replacing FIG. 3 will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 10A is a cross-sectional plan view showing the same structure as FIG. 3A, and FIG. 10B is an enlarged view of D in FIG. 10A.

  The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 10B, a small hole 12 a having a desired diameter is provided on the side surface of the exhaust port 12 as a configuration for communicating a part of the exhaust air passage and the outside air in the first embodiment.

  A static pressure P that is perpendicular to the direction of the exhaust flow and that corresponds to the value of the exhaust air flow rate Q is generated on the wall surface of the exhaust port 12 (proportional to the square root of Q).

  The section 15a is fixed to the control box 5, and is set to bend toward the electrostatic touch electrode 15 by the wind blown from the small hole 12a. Even if the section 15a is fixed to the casing 10 as a flat plate for convenience in processing, the effect is the same. The electrostatic touch electrode 15 is disposed at a position approaching when the segment 15a is curved, and the rotational speed of the fan motor 8 is controlled so that the static pressure P becomes constant as described in the operation of the first embodiment. By doing so, the exhaust air volume Q can be made constant.

(Embodiment 3)
In the present embodiment, the exhaust duct 4 is attached to the ventilation device 1, that is, the ventilation system is implemented. Since this embodiment is the same except for FIG. 3 in FIGS. 1 to 9 described in the first embodiment, FIG. 11 instead of FIG. 3 will be described. The same parts as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. A characteristic part of the present embodiment is that a hole corresponding to the small hole 12a of the second embodiment is formed by a communication hole 4a provided in the exhaust duct 4 and a small hole 25a provided in the box 25 incorporating the detector. Composed. That is, the communication hole 4 a is provided on the side surface of the exhaust duct 4. And the box 25 which provided the small hole 25a is attached so that the communicating hole 4a and the small hole 25a may overlap.

  11 (a) is a cross-sectional plan view showing the same structure as FIG. 3 (a), FIG. 11 (b) is an enlarged view of E in FIG. 11 (a), and FIG. 11 (c) is a perspective view thereof. is there.

  A method for installing the box 25 will be described. A communication hole 4a and holes 4b and 4c are provided in the exhaust duct 4 attached to the exhaust port 12 at the construction site, and the box 25 is fixed with screws 4d and 4e. The communication hole 4a is a communication hole that communicates with a small hole 25a having a desired diameter provided in the box 25. A section 15 a is fixed in the box 25, the electrostatic touch electrode 15 is provided on the printed board 15 b, and the lead wire 15 c is connected to the control device 14 in the control box 5. A small hole 25a is provided at the bottom of the box 25 where the electrostatic touch electrode 15 is installed. The box 25 is installed so that all of the small holes 25a enter the communication holes 4a.

  As described in the second embodiment, a static pressure is generated on the wall surface of the exhaust duct 4 according to the value of the exhaust air volume Q, which is perpendicular to the direction of the exhaust flow.

  The section 15a is fixed to the box 25 and is set to bend toward the electrostatic touch electrode 15 by the wind blown from the small hole 25a. The electrostatic touch electrode 15 is disposed at a position approaching when the slice 15a is curved, and controls the rotation speed of the fan motor 8 so that the pressure P becomes constant as described in the operation of the first embodiment. Thus, the exhaust air volume Q can be made constant.

  In the present embodiment, since the small hole 25a for detecting the pressure is provided at a position away from the exhaust port 12, the exhaust air volume Q is in a laminar flow state, and the dynamic pressure is further increased than in the second embodiment. Since a stable static pressure is generated without being affected, the pressure P is also stabilized and the exhaust air volume can be controlled with high accuracy.

  Moreover, since the pressure P is defined by the diameter of the small hole 25a of the box 25 by specifying it in the construction instruction so that the diameter of the communication hole 4a is larger than that of the small hole 25a, the performance can be confirmed in the state before the mounting. And fine-tuning can be performed, and workability on site is also improved. This is because the box 25 is manufactured in a factory and the small hole 25a can be precisely machined to a required diameter in advance by machining, whereas the communication hole 4a of the exhaust duct 4 is machined locally at the time of construction. This is because it is difficult to machine into an accurate diameter. With this configuration, the box 25 can be easily constructed without any restrictions during construction.

  The ventilator according to the present invention can be applied to a ventilator of a simultaneous air supply / exhaust type ventilator because the ventilator of the present invention can supply a stable displacement regardless of the pipe length or the external pressure. Useful for all devices.

DESCRIPTION OF SYMBOLS 1 Ventilator 4 Exhaust duct 4a Communication hole 8 Fan motor 9 Fan 10 Casing 10a Small hole 11 Intake port 12 Exhaust port 12a Small hole 14 Control device 15 Electrostatic touch electrode 15a Section 16 Temperature correction thermistor 23 Speed control means 24 Air volume setting Switch 25 Box 25a Small hole 26 Duct length setting means

Claims (9)

A ventilator comprising a casing having an air inlet and an air outlet, a fan motor equipped with a fan housed in the casing, and a control device for driving the fan motor,
The casing is provided with a small hole for communicating the inside of the fan motor guide vane with the outside of the casing,
The controller is
While being attached to the outer wall surface of the casing so as to cover the small hole,
Speed control means for controlling the rotational speed of the fan motor;
An electrode that can detect the capacitance directly facing the small hole;
A section that is curved by the pressure of the air transmitted from the small hole so as to block between the electrode and the small hole is provided inside,
Further, the control device discharges from the exhaust port by controlling the rotation speed of the fan motor so that the pressure of the air transmitted from the small hole converted from the capacitance detected by the electrode becomes a predetermined value. A ventilator characterized by maintaining a constant air volume. The ventilator according to claim 1, wherein the small hole is provided at a position of the casing substantially opposite to a direction of the exhaust flow generated by the rotation of the fan. The ventilator according to claim 1, wherein the small hole is provided at a position of the casing perpendicular to a direction of an exhaust flow generated by rotation of the fan. A ventilation system comprising a casing having an air inlet and an air outlet, a fan motor equipped with a fan housed in the casing, a control device for driving the fan motor, and an exhaust duct connected to the air outlet,
The exhaust duct is provided with a communication hole,
The controller is
A box attached to the outer wall surface of the exhaust duct so as to cover the communication hole;
Comprising a speed control means for controlling the rotational speed of the fan motor;
The box is
A small hole having a smaller diameter than the communication hole,
An electrode that can detect the capacitance directly facing this small hole,
With a section curved by the pressure of the air transmitted from the small hole,
Installed on the outer wall of the exhaust duct so that the small hole and the communication hole overlap,
The controller controls the amount of air discharged from the exhaust port by controlling the rotational speed of the fan motor so that the pressure of the air transmitted from the small hole converted from the capacitance detected by the electrode becomes a predetermined value. Ventilation system characterized by keeping constant. Storing the section close to the small hole of the box;
The ventilation system according to claim 4, wherein the box is attached to the exhaust duct so that the entire diameter of the small hole of the box is within the diameter of the communication hole opened in the exhaust duct. The control device includes a duct length setting means, and the predetermined value for controlling the rotational speed of the fan motor so that the pressure of the air transmitted from the small hole converted from the capacitance detected by the electrode becomes a predetermined value. The ventilation apparatus according to any one of claims 1 to 3, wherein the ventilation apparatus corrects the duct length. The control device includes a duct length setting means, and the predetermined value for controlling the rotational speed of the fan motor so that the pressure of the air transmitted from the small hole converted from the capacitance detected by the electrode becomes a predetermined value. The ventilation system according to claim 4 or 5, wherein the ventilation length is corrected by the duct length. The control device includes a temperature correction thermistor, and corrects a pressure value converted from a capacitance detected by the electrode with an ambient temperature detected by the temperature correction thermistor. Ventilation device. The ventilation system according to claim 4, 5 or 7, wherein the control device includes a temperature correction thermistor, and corrects a pressure value converted from a capacitance detected by the electrode with an ambient temperature detected by the temperature correction thermistor.

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