JP5747158B2 - Ventilation equipment - Google Patents

Description

  The present invention relates to a ventilation device in which a blade is detachable and a groove of a roll pin and a blade boss engages to prevent the blade from rotating.

  Conventionally, this type of ventilator has a groove in a blade boss, and is known to function as a blade detent by engaging with a roll pin (see, for example, Patent Document 1).

  Hereinafter, the blower will be described.

  The blade has a boss portion at the center, and a plurality of blades are provided on the outer periphery thereof. A shaft hole into which the motor shaft (only the shaft is shown) is inserted in the shaft center portion of the boss portion, and the blade is perpendicular to the shaft hole. The direction groove is formed with an engagement groove that engages with a roll pin inserted into the shaft, and the blade is configured to prevent rotation, and the shaft is inserted into the shaft hole of the boss portion, and then the boss By rotating and fixing the spinner to the tip end side of the part (the fixing mechanism is not shown), the blades are configured to be kept from being pulled out.

Japanese Patent Laid-Open No. 62-10532

  In such a conventional ventilation device, when the DC motor is operated by using positioning, the groove of the roll pin and the blade boss collides with each other, and a sound is generated. It is conceivable to reduce the gap with the roll pin and prevent collision, but if you use a blade with a structure that can be easily attached and detached, there is a problem that it becomes difficult to attach the blade to the motor shaft, and it is attached halfway, An object of the present invention is to provide a blower that prevents collision noise with the groove of the blade boss and is easy to mount the blade.

  In order to achieve the above object, the ventilator according to the present invention includes a DC motor that positions and activates the rotor at the time of activation, a control unit that controls the DC motor, and a motor shaft of the DC motor perpendicular to the axis thereof. And a blade having a boss portion provided in the center with a roller pin inserted and a groove coupled to the roll pin and a blade lock portion held by the motor shaft, and the groove is formed on the motor side of the boss portion. A groove cut from the end face located in a direction along the axis of the shaft, and a side wall of the groove has a slope portion extending from the bottom of the groove toward the opening in the counter-rotating direction of the DC motor; The straight portion is formed in the axial direction of the shaft from the bottom toward the opening, and the blade lock portion is pressed against the holding portion that is in pressure contact with the motor shaft. Accordingly, a pair of pressing portions for moving the holding portion to release the holding force are integrally formed, and the blades are detachably provided. The control portion rotates counterclockwise when the DC motor is activated. When the roll pin is moved in a direction, the DC motor is positioned by applying a voltage so that the roll pin does not slide on the slope, that is, a force smaller than a friction force is applied to the roll pin. It achieves its purpose.

  According to the present invention, a DC motor that positions and starts the rotor at the time of startup, a control unit that controls the DC motor, a roll pin that is inserted into a motor shaft of the DC motor at a right angle to its axis, and the roll pin And a blade having a boss portion provided in the center with a blade lock portion held by the motor shaft, and the groove extends from an end surface located on the motor side of the boss portion to the axis of the shaft. A groove cut in a direction along the wall, and a side wall of the groove has a slope portion extending from the bottom of the groove toward the opening in the counter-rotating direction of the DC motor, and from the bottom to the opening. A straight portion is formed in the axial direction of the shaft, and the blade lock portion moves the holding portion by pressing against the holding portion that is pressed against the motor shaft. A ventilation device in which a pair of pressing portions for releasing the holding force are integrally formed and the blades are detachably provided, wherein the control unit moves in the anti-rotation direction when the DC motor is activated. Is not slipped on the slope, that is, the DC motor is positioned so that a force smaller than a frictional force is applied to the roll pin, and the collision between the roll pin and the groove is made as small as possible. The effect of preventing the collision noise between the blade boss groove and the roll pin can be obtained.

The block diagram of the ventilator of Embodiment 1 of this invention Cross-sectional configuration diagram showing the side of the ventilator Detailed view showing details of portion A of FIG. Flowchart of Embodiment 1 of the present invention Detailed view showing details of portion A of FIG. Flowchart of Embodiment 2 of the present invention

  The invention according to claim 1 of the present invention includes a DC motor that positions and activates the rotor at the time of activation, a control unit that controls the DC motor, and a roll that is inserted into the motor shaft of the DC motor at a right angle to its axis. A pin, a blade having a boss portion provided with a groove coupled to the roll pin and a blade lock portion held by the motor shaft in the center, and the groove extends from an end surface located on the motor side of the boss portion. A groove cut in a direction along the axis of the shaft, and a side wall of the groove has a gradient portion extending from the bottom of the groove toward the opening in the counter-rotating direction of the DC motor, and an opening from the bottom A straight portion is formed in the axial direction of the shaft toward the shaft, and the blade lock portion is pressed against the holding portion that is in pressure contact with the motor shaft. A ventilation device that integrally forms a pair of pressing parts for moving and releasing the holding force and detachably installing the blades, and when the control unit operates in the counter-rotating direction when the DC motor is activated, The DC motor is positioned by applying a voltage so that the roll pin does not slide on the slope, that is, a force smaller than a frictional force is applied to the roll pin.

  As a result, when the DC motor is started, the control unit performs positioning in order to specify the position of the rotor, but the blade is rotated in the anti-rotation direction by applying a voltage so that a force smaller than the frictional force is applied to the roll pin. The roll pin does not slide on the gradient even if it is made, and even if the blade is rotated again in the rotation direction, the straight portion of the groove of the blade boss and the roll pin do not collide, and the effect of preventing the collision noise is produced.

  The invention of claim 2 of the present invention has a configuration in which the control means of the DC motor is sensorless. Thereby, since Hall IC etc. which are detecting the position of SN can be reduced, there is an effect that a product can be proposed to the customer at a low price.

  The invention of claim 3 of the present invention has a configuration in which the main body configuration is used for constant current control.

  As a result, the number of Hall ICs that detect the SN position can be reduced, so that products can be proposed to customers at low cost, and the effect of preventing the collision noise between the blade boss and the roll pin when the DC motor is activated is achieved.

  The invention of claim 4 of the present invention has a configuration in which the main body configuration is used for voltage and current control. As a result, the number of Hall ICs that detect the SN position can be reduced, so that products can be proposed to customers at low cost, and the effect of preventing the collision noise between the blade boss and the roll pin when the DC motor is activated is achieved.

  The invention according to claim 5 of the present invention has a configuration in which the main body configuration is used for constant rotation speed control. As a result, the number of Hall ICs that detect the SN position can be reduced, so that products can be proposed to customers at low cost, and the effect of preventing the collision noise between the blade boss and the roll pin when the DC motor is activated is achieved.

  According to a sixth aspect of the present invention, a round cylindrical roll pin inserted into the motor shaft at a right angle to the curve thereof and an O-ring inserted into the motor shaft are provided on the roll pin, and a blade is attached to the roll pin. Sometimes it has a configuration of being sandwiched between straight portions.

  This produces an effect of preventing the collision noise between the blade boss and the roll pin when the DC motor is activated.

  The invention of claim 7 of the present invention has a configuration in which the shape of the roll pin is a round cylinder.

  Thereby, there exists an effect that a blade | wing is easy to mount | wear.

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

(Embodiment 1)
A ceiling-embedded ventilation fan shown in FIG. 1 is embedded in a ceiling of a room and has a suction port 1 corresponding to an opening of a ceiling plate on a lower surface, a frame 3 having a discharge port 2 on a side surface, and a frame 3. A DC motor 4 fixed on the top surface of the frame 3, a driven blade 5, a casing (not shown) surrounding the blade 5, and a lower surface opening of the frame 3 are covered and removed from the room side. And a circuit case 8 which is mounted on the top surface of the frame 3 and houses a control circuit 7 which drives and controls the DC motor 4.

  Further, as shown in FIGS. 2 and 3, a round cylindrical roll pin 10 inserted into the motor shaft 9 of the DC motor 4 at a right angle with respect to the longitudinal direction, a groove 12 coupled to the roll pin 10, and the motor shaft 9 hold it. The blade 5 is provided with a boss portion 11 provided with a blade lock portion 9a to be provided in the center, and the groove 12 is cut in a direction along the axis of the motor shaft 9 from the end surface of the boss portion 11 located on the DC motor 4 side. The groove 12 has a side wall 12a having a slope portion 17b extending from the bottom portion 17 of the groove 12 toward the opening portion 17a in the counter-rotating direction of the DC motor 4, and a bottom portion 17 to the opening portion 17a. The straight portion 18 is formed in the axial direction of the motor shaft 9 and the blade lock portion 9a is pressed against the holding portion 13 that is in pressure contact with the motor shaft 9, A pair of pressing portions 14 for moving the holding portion 13 to release the holding force are integrally formed, the motor shaft 9 is held by the holding portion 13, and the holding force of the holding portion 13 is increased by an operation of pinching the pressing portion 14 by a person. The blade structure is provided with an attachment / detachment device 15 that can be easily detached and attached to the blade 5 and the motor shaft 9.

  The control circuit 7 for driving the DC motor 4 is turned on / off the commercial power supply, and the fan notch variable switch 16 (integrated switch) is disposed on the indoor wall and connected to the ceiling embedded ventilation fan.

  The configuration of the control circuit 7 (not shown) includes a switching power supply circuit (for example, an AC-DC converter), a driver IC for controlling the DC motor 4, and a current for varying the notch (for example, weak / strong) of the fan. In order to maintain the current defined by the current detection means, the detection means (for example, a resistor) is provided, and the DC motor 4 is operated at a constant current by feeding back the current value to the switching power supply so that the current is always constant. It is configured to do.

  Since the DC motor 4 does not have a Hall element inside the motor, a sensorless method is adopted, and position detection is not possible. Therefore, until the rotor can be positioned, that is, until the position of the rotor with respect to the stator is determined. A pulsed DC voltage is applied at a certain time interval in a specific phase. For this reason, the motor shaft 9 rotates left and right at regular time intervals. When positioning is completed, an energization signal of forced forced commutation is output, and the DC motor 4 is rotated so as to follow the rotating magnetic field rotor by energization. When the DC motor 4 rotates, an induced voltage is generated in the winding of each phase (U phase, V phase, W phase), and when a signal indicating the positive / negative of each phase terminal voltage including the induced voltage is input as a position signal, The energization signal of forced commutation is automatically switched to the energization signal based on the position signal input (induced voltage), and the DC motor 4 is driven by sensorless driving.

  The above configuration will be described below with reference to the flowchart shown in FIG.

  For example, when a ventilator user operates an embedded ceiling fan, the power is applied to the control circuit 7 when the commercial power is turned on / off, the fan notch variable switch 16 (for example, a strong notch) is set and the power is turned on. Is done. For example, when power is applied to the control circuit 7, a pulsed DC voltage is applied to a specific winding at an interval of 200 mS in the initial energization for 5 seconds.

  When a pulsed DC voltage is applied, the rotor is attracted to a predetermined position of the stator, excessively overshooting, and returned to the opposite direction by the application of the next pulsed DC voltage, centering on the predetermined position. The rotation will be repeated left and right.

  A pair of pressing portions 14 that move the holding portion 13 and release the holding force by pressing the blade locking portion 9a as in the present embodiment, that is, the holding portion 13 that presses against the motor shaft 9, are integrally formed. An attachment / detachment device 15 is provided that holds the motor shaft 9 by the holding portion 13 and releases the holding force of the holding portion 13 by an operation of pinching the pressing portion 14 by a person so that the blade 5 and the motor shaft 9 can be easily attached / detached. In the ventilation device provided with the blade structure, since the blade 5 can be easily attached and detached, the roll pin 10 and the groove 12 are formed so as to be loosely fitted.

  Therefore, the roll pin 10 slides in the groove 12 by rotating the rotor left and right as described above. The roll pin 10 may repeatedly collide with the straight portion 18 and the gradient portion 17b alternately.

  However, the collision can be eased by using the present embodiment.

  That is, in order to start the DC motor 4, the initial energization time for positioning the rotor (DC excitation time) does not slide on the gradient portion 17 b regardless of the air volume setting of the ventilator. Positioning is performed by applying a pulsed voltage to the DC motor 4 so that a force smaller than the frictional force is applied to the roll pin 10.

  For example, even if the airflow setting is set to a strong notch, a pulsed DC voltage corresponding to the applied voltage when operating with a weak notch is selected, positioning is performed by applying a voltage to the DC motor 4, and then Then, a forced commutation energization signal that matches the air volume setting is output, and the DC motor 4 is rotated. Note that the effective value of the DC voltage applied to the winding is determined by adjusting the pulse width of the pulsed DC voltage, and the rotational force of the rotor is adjusted by this effective value, and the rotation of the roll pin 10 is grooved. It is possible to make the frictional force smaller than 12.

  When the DC motor 4 rotates, an induced voltage is generated in the winding of each phase (U phase, V phase, W phase), and when a signal indicating the positive / negative of each phase terminal voltage including the induced voltage is input as a position signal, The energization signal of forced commutation is automatically switched from the energization signal to the energization signal based on the position signal input (induced voltage), the DC motor 4 is driven, and after 5 seconds, the current detected by the current detection means (that is, a strong notch) ) Will drive.

Since the ventilator configured as described above always starts from a weak notch when the power is turned on, when positioning the rotor, the current flowing through the DC motor 4 starts with the lowest current.
A collision sound that occurs between the roll pin 10 and the groove 12 can be suppressed.

  The forced weak notch time at startup is 5 seconds, but the effect is the same when the time of the forced weak notch time is varied.

  In addition, in order to start the DC motor 4 this time, the weak notch is selected regardless of the setting of the air volume of the ventilator during the direct current excitation time for positioning the rotor. However, if the rotor position is moved in the counter-rotating direction, and if it moves on the gradient portion 17b, positioning is performed by applying a voltage so that the rotational force is lower than the frictional force. Similar effects can be obtained.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same thing as Embodiment 1 attaches | subjects the same number, and abbreviate | omits the detailed description.

  When a rubber O-ring (not shown) is placed on the roll pin 10 and the blade 4 is fitted to the motor shaft 9, the gap between the roll pin 10 and the groove 12 is eliminated by pinching the groove 12, and no collision sound is generated. .

  Further, as shown in FIG. 6, the motor shaft 9 is provided with a concave groove 20 that engages the holding portion 13, and the motor shaft 9 is provided with a C surface 21 on the curved surface and the concave groove 20, and the C surface 21 motor. Since the longitudinal dimension of the shaft 9 is the same as that of the straight portion 18 provided in the groove 12 of the blade 5, the moment that the holding portion 13 slides on the C surface 21 when the motor shaft 9 is inserted. Thus, the roll pin 10 is inserted into the position of the straight portion 18.

  With the above operation, it is possible to provide a blower that prevents collision noise between the roll pin 10 and the groove 12 of the blade boss and that the blade 5 can be easily attached and does not attach to the halfway end.

(Embodiment 3)
The second embodiment will be described with reference to FIG. Note that description of the same components as those in the first embodiment is omitted.

  The configuration (not shown) of the control circuit 7 includes a switching power supply circuit (for example, an AC-DC converter) and a driver IC for controlling the DC motor 4, and performs control while capturing changes in the DC motor 4.

  The above configuration will be described below with reference to the flowchart shown in FIG.

  The switching power supply circuit includes current detection means, reads the load change state based on the detected current, controls the DC motor 4 while constantly changing the current and voltage by varying the voltage applied to the load, In the control circuit 7 that can keep the ventilation airflow constant even when the duct resistance changes due to the influence of outside wind, etc., the ventilator user sets the airflow to a strong level and turns on the power to the ceiling-mounted ventilation fan. The DC motor 4 tries to stabilize at a position where the duct resistance and the air volume are balanced, but only at the time of start-up, the lowest voltage (for example, 5V) defined by the switching power supply circuit is output for 5 seconds to start constant voltage. DC excitation time during which the rotor is positioned), the lowest voltage is selected regardless of the intention of the ventilator user, the DC motor 4 is operated, positioning is completed, and forced commutation is performed. Outputting an energization signal to rotate the DC motor 4. When the DC motor 4 rotates, an induced voltage is generated in the winding of each phase (U phase, V phase, W phase), and when a signal indicating the positive / negative of each phase terminal voltage including the induced voltage is input as a position signal, The energization signal of forced commutation is automatically switched from the energization signal to the energization signal based on the position signal input (induced voltage), the DC motor 4 is driven, and after 5 seconds, the constant voltage drive circuit changes to the voltage / current drive circuit. Since the control is performed by switching, when the rotor is positioned, the current flowing through the DC motor 4 starts with the lowest voltage, so that the collision noise occurring between the roll pin 10 and the groove 12 can be suppressed.

  The effect is the same even when the control method of the control circuit 7 is controlled by the number of rotations and the initial energization is always controlled by the minimum number of rotations.

  Moreover, there are current-rotational speed control, voltage-rotational speed control, etc. as a method for keeping the ventilation air flow constant, but the effect is the same even if the DC motor 4 is operated using the lowest notch that can be output by the control circuit only at the initial energization. Is.

  The ventilating apparatus according to the present invention can be widely applied to a ventilating apparatus provided with a blade mounting device in which a roll pin is provided on a shaft of a motor and a groove engaging with the roll pin is provided on a boss portion of the blade to prevent the blade from rotating.

4 DC motor 5 blade 7 control circuit 8 circuit case 9 motor shaft 9a blade lock portion 10 roll pin 11 boss portion 12 groove 12a side wall 13 holding portion 14 pressing portion 15 attachment / detachment device 16 commercial power supply on / off, fan notch variable switch 17 bottom portion 17a Opening part 17b Gradient part 18 Straight part 20 Concave groove 21 C surface

Claims (7)

  A DC motor for positioning and starting the rotor at the time of startup, a control unit for controlling the DC motor, a roll pin inserted into the motor shaft of the DC motor at a right angle to its axis, and a groove and motor coupled to the roll pin A blade having a boss portion provided in the center with a blade lock portion held by the shaft, and the groove is cut in a direction along an axis of the shaft from an end surface located on the DC motor side of the boss portion. A side wall of the groove has a gradient portion that extends from the bottom of the groove toward the opening in the counter-rotating direction of the DC motor, and an axial direction of the shaft from the bottom to the opening. A straight portion is formed, and the blade lock portion is released from the holding force that moves the holding portion by pressing against the holding portion that presses against the motor shaft. A ventilation device in which a pair of pressing portions to be integrally formed and the blades are detachably provided, wherein the control unit operates in a counter-rotating direction when the DC motor is activated, and the roll pin is on the gradient. A ventilation device for applying a voltage to the DC motor so as not to slip, that is, a force smaller than a frictional force is applied to the roll pin.   The ventilation apparatus according to claim 1, wherein the DC motor control means is sensorless.   The ventilator according to claim 1 or 2, wherein the main body configuration is used for constant current control.   The ventilator according to claim 1, 2 or 3, wherein the main body configuration is used for voltage and current control.   The ventilator according to claim 1, 2, 3, or 4, wherein the main body configuration is used for constant rotation speed control.   A round cylindrical roll pin inserted into the motor shaft at a right angle to the curve and an O-ring to be inserted into the motor shaft on the roll pin, and when the blade is attached to the roll pin, it is sandwiched between straight portions The ventilator according to claim 1.   The ventilator according to claim 1, wherein the roll pin has a round cylindrical shape.

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