JP2011094870A - Fluid conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress noise generated in vibration even in a constitution capable of conveying a vortex ring to a far optional area by driving at a large vibration amplitude. <P>SOLUTION: This fluid conveying device includes: a pressurization chamber 1 having an opening hole 5; a drive device 100 for driving a vibration plate 101 to move forward and backward on the basis of an input signal for pressurizing air in the pressurization chamber and releasing the air from the opening hole; and a signal transmitting means for transmitting an input signal from which a frequency component equal to or larger than a character frequency of the vibration plate is removed to the drive device. The noise generated in vibration can be suppressed without reducing a fluid conveying amount. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fluid conveyance device that conveys, for example, humidified air into a gas phase to indoor and outdoor arbitrary areas.

  As a means for generating humidified air, a method of conveying humidified air by ventilating a vaporizing element holding water, a method of atomizing water by generating fine particles at the water interface by ultrasonic vibration, or water There is a method of evaporating by heating with humidified air generating means. In either method, the generated humidified air is transported to a distant region by being placed in an air current using a fan.

  In the case where the humidified air generated as described above is transported using a fan, since the humidified air released from the outlet of the humidifier diffuses immediately, it is humidified from the vicinity of the outlet, Gradually the whole room is humidified. Therefore, when it is desired to humidify a person or a specific place, an excessive amount of humidification is required. Particularly when used in a wide space, a large amount of humidification is required, resulting in an increase in the size of the humidifier. In addition, when the entire room is humidified, dew condensation on the windows and partial over-humidification become a hotbed for mold growth.

  Therefore, there has been proposed an apparatus in which the generated humidified air is pressurized to generate vortex ring-shaped air so that it can be transported far away. The vortex ring air is excellent in translation and translates while maintaining the shape of the vortex ring while gradually diffusing. For this reason, by forming the vortex ring with humidified air, the humidified air can be diffused in a place where the vortex ring collides with the object and collapses. For this reason, it is possible to control a region where humidification is desired, and it is possible to quickly humidify a predetermined space regardless of whether it is indoors or outdoors.

  By the way, in the humidifying device using the vortex ring as described above, there are a direct drive system (speaker) and a means using a solenoid that operates in the same manner as means for pushing out the humidified air to the outside of the apparatus. In a configuration in which a rectangular wave current is input to the coil and the diaphragm is driven like a speaker, the displacement of the diaphragm does not fully respond to the rectangular wave when current is applied, and transient distortion occurs near the maximum amplitude position. Will be generated and cause abnormal noise, which will make the user uncomfortable.

  Therefore, a member that regulates the displacement of the diaphragm is added to suppress transient distortion (for example, see Patent Document 1), or the direction of the impact sound generated by forming the diaphragm in a convex shape with respect to the compression side. Measures are taken to disperse sound by enlarging the corners (see, for example, Patent Document 2).

JP 2007-261371 A (FIGS. 3 to 6) JP 2007-261373 A (FIGS. 3 to 6)

  However, in the case of a member provided with a member that restricts the variation of the diaphragm in order to suppress transient distortion, the amplitude of the diaphragm, which is an important factor for determining the amount of humidified air transported by the vortex ring, cannot be increased. Although the sound reduction effect is recognized, the amount of humidified air that is the originally required performance is reduced.

  Also, in the case where the diaphragm is formed in a convex shape with respect to the compression side to disperse the generated sound, the direction of pushing out the air is not constant, so a clean vortex ring cannot be formed, and the vortex ring breaks immediately. It cannot be transported far away.

  As described above, conventionally, there is a problem that if the generated abnormal noise is reduced, the generation of the vortex ring is affected.

  The technical problem of the present invention is to be able to suppress abnormal noise generated at the time of vibration even when the vortex ring is driven with a large vibration amplitude and can be transported to an arbitrary distant area.

  A fluid conveyance device according to the present invention includes a pressurizing chamber having an opening hole, a driving device for driving the diaphragm forward and backward based on an input signal, and pressurizing air in the pressurizing chamber to release it from the opening hole. And a signal transmitting means for transmitting an input signal from which a frequency component equal to or higher than the natural frequency of the diaphragm is removed to the driving device.

  According to the fluid conveyance device of the present invention, it is possible to suppress abnormal noise generated during vibration without reducing the amount of fluid conveyance.

It is side surface sectional drawing which shows the whole structure of the fluid conveying apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which expands and shows the drive device of the fluid conveying apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the signal input part of the drive device of the fluid conveying apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation | movement until humidified air is radiate | emitted as a vortex ring after the signal of the fluid conveying apparatus which concerns on Embodiment 1 of this invention is input. It is a wave form diagram which shows the characteristic of the signal input into the drive device of the fluid conveying apparatus which concerns on Embodiment 1 of this invention. It is a wave form diagram which shows the relationship between the frequency of the signal input into the drive device of the fluid conveying apparatus which concerns on Embodiment 1 of this invention, and a sound pressure compared with the past. It is side surface sectional drawing which shows the whole structure of the fluid conveying apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a side sectional view showing the overall configuration of the fluid conveyance device according to the first embodiment, FIG. 2 is an enlarged sectional view of the driving device, and FIG. 3 shows the configuration of a signal input unit of the driving device. FIG. 4 is a block diagram, FIG. 4 is a flowchart showing the operation from when the signal is input until the humidified air is emitted as a vortex ring, FIG. 5 is a waveform diagram showing the characteristics of the signal input to the drive device, and FIG. FIG. 4 is a waveform diagram showing the relationship between the frequency of a signal input to the driving device and the sound pressure in comparison with the prior art.

  As shown in FIG. 1, the fluid conveyance device, that is, the humidifying device 102 according to the present embodiment has the pressurizing chamber 1 formed on the front side inside the cabinet 30 serving as the outer shell, and the driving device 100 is arranged on the rear side. .

  As shown in FIG. 2, the driving device 100 includes a yoke 10 that is the bottom surface, a center pole 11 that is integrally molded at the center of the yoke 10, a magnet 12 that is fixedly disposed around the center pole 11, and an upper surface of the magnet 12. It has a fixed plate 13, a voice coil 14 to which a drive signal is input, and a voice coil bobbin 15 that is fitted to the center pole 11 and around which the voice coil 14 is wound.

  The magnet 12 uses neodymium, samarium cobalt, ferrite, alnico, or the like. The winding width of the voice coil 14 has an area covering the voice coil bobbin 15, and electromagnetic driving is performed between the voice coil bobbin 15 and the magnet 12 by the input voltage applied to the voice coil 14. It is designed to vibrate.

  The voice coil bobbin 15 is fixed to a fixed position of the diaphragm 101 by an adhesive layer 16. The diaphragm 101 has a larger outer diameter than the voice coil bobbin 15 and is made of a hard and light material. However, when the supplied humidified air is steam, the diaphragm 101 may be further deformed with respect to the steam. It is preferable to use a material having a low heat resistance function. Furthermore, by being provided with a material having a large vibration damping capability such as rubber so as to come into contact with the vibration plate 101, it is possible to prevent amplification due to resonance of abnormal noise generated in the pressurizing chamber 1.

  A frame 17 is provided so as to cover the back surface from the periphery of the diaphragm 101, and one end of the frame 17 and the diaphragm 101 are connected by an edge 18. As a result, the voice coil bobbin 15 is held by the frame 17 via the diaphragm 101 and the edge 18. Unlike the diaphragm used in a general speaker device, the voice coil bobbin 15 and the edge 18 are installed for the purpose of preventing the entry of humidified air into the adhesive layer 16.

  More specifically, the edge 18 has a circular arc shape that protrudes in the pressurizing direction of the diaphragm 101, and has an arc radius (projection amount) that is equal to or greater than the amplitude length of the diaphragm 101. Further, the material of the edge 18 needs to be formed from an elastic material such as a rubber material having elasticity, but if it is too hard, deflection at the end of the diaphragm will occur at the time of vibration. A plurality of vortex rings are generated, which is not preferable. In addition, the edge 18 is connected to the diaphragm 101 and the frame 17 by the diaphragm fixing portion 20 and the frame fixing portion 21 at both ends thereof, and the vibration of the member is suppressed at one or more places among these connecting portions. Occurrence of abnormal noise due to vibration can be suppressed by interposing the damping material.

  The voice coil bobbin 15 and the frame 17 are connected by a damper 22 made of a stretchable member or a pleated member, and the voice coil bobbin 15 is elastically held at a predetermined position by the damper 22. . Further, when the voice coil bobbin 15 is moved up and down by the electromagnetic drive of the magnet 12 and the voice coil 14, the damper 22 does not hinder the movement of the damper 22 and does not wobble from side to side with respect to the vertical movement. It also has a supporting function.

  In the humidifying device 102, the pressurizing chamber 1 is formed on the front side of the driving device 100, and the shape of the cabinet 30 serving as the outline of the pressurizing chamber 1 is various shapes such as a rectangular parallelepiped shape, a cylindrical shape, and a spherical shape. Can be adopted. On the bottom surface of the pressurizing chamber 1, a water storage unit 3 that temporarily stores the water in the water storage tank 6 is provided. A humidified air generating means 4 for generating steam by heating the water in the water storage section 3 is provided around the water storage section 3 so that the generated steam can be directly introduced into the pressurizing chamber 1. In addition, a circular opening hole 5 for radiating humidified air introduced into the pressurizing chamber 1 toward an arbitrary area is formed on the front wall of the pressurizing chamber 1.

  The humidified air generating means 4 is composed of a heating wire provided on the outer periphery of the water storage unit 3 and generates heat by passing an electric current through the heating wire, and heats the heat conducted to the water in the water storage unit 3. By this, steam is generated. The humidified air generating means 4 only needs to be able to generate humidified air. For example, as long as it is a method of generating steam by heating water, a ceramic heater or other heater may be used instead of the heating wire, As other methods, a method of atomizing water with ultrasonic waves or a method of atomizing by spraying from a fine hole nozzle may be used.

  The area of the opening hole 5 is set in a range of approximately ½ to 1/10 of the area of the diaphragm 101. When the area of the opening hole 5 is larger than ½ of the area of the diaphragm 101, it is necessary to increase the amplitude and the excitation force of the diaphragm 101, and there is a problem that abnormal noise increases. Further, when the area of the opening hole 5 is smaller than 1/10 of the area of the diaphragm 101, the signal input can be lowered and the problem of abnormal noise is almost eliminated, but the diameter of the generated vortex ring is reduced. For this reason, the flight distance of the vortex ring is shortened, and the humid air cannot be effectively conveyed with respect to the size of the diaphragm.

  An installation piece 40 for fixing the drive device 100 in a predetermined position is formed in the cabinet 30 so as to protrude inward, and a drive device air chamber 41 is provided on the rear side of the cabinet 30 by the drive device 100. It is defined. Further, an air valve (breathing hole) 43 having an arbitrary shape is formed at an arbitrary position on the back surface 42 of the cabinet 30. When the air valve 43 is not provided, the diaphragm 101 of the driving device 100 receives the influence of the pressure in the driving device air chamber 41 via the voice coil bobbin 15, which causes a problem that the driving of the diaphragm 101 is obstructed. To do. By providing the air valve (breathing hole) 43, the pressure in the driving device air chamber 41 can be made the same as the pressure of the outside air, and the diaphragm 101 can be freely moved.

  The shape of the pressurizing chamber 1 may be rectangular or cylindrical, but when the structure is particularly narrowed toward the opening hole 5 as shown in FIG. 1, the pressurized air is pressurized. Since it becomes a laminar flow in the chamber 1, the wind speed in the opening hole 5 is increased, and the flight distance of the vortex ring tends to be increased, which is preferable.

  In addition, when the humidified air to be supplied is steam, the member of the pressurizing chamber 1 is preferably made of a heat-resistant material so as not to be deformed with respect to the steam, and further has a good thermal conductivity. By using, dew condensation on the inner wall surface of the pressurized chamber can be suppressed.

  Furthermore, by constituting the member of the pressurizing chamber 1 from a material having a large vibration damping ability such as rubber, vibration of the pressurizing chamber 1 itself due to resonance of abnormal noise generated in the pressurizing chamber 1 is suppressed. be able to.

  If an obstacle such as the water storage unit 3 is arranged in the vibration direction, turbulent flow is likely to occur, and the initial speed of the generated vortex ring cannot be obtained, making it difficult to transport to a distant place. The air pushed out by the vibration plate 101 preferably forms a laminar flow in the pressurizing chamber 1. For this reason, in the present embodiment, the water storage unit 3 is disposed at the bottom of the pressurizing chamber 1 that does not interfere with the vibration direction of the vibration plate 101 that is vibrated by the driving device 100.

  A signal to the driving device 100 is input through the path shown in FIG. That is, the household power supply signal 51 supplied from the outside is input to the driving device 100 through the arbitrary waveform generator 52, the low-pass filter 53 that transmits only the low frequency band, and the amplifier 54.

Next, the operation of the humidifier 102 of this embodiment will be described with reference to FIGS.
The water storage tank 6 to which water is supplied from the outside is installed in the tank storage unit. As a result, a certain amount of water flows into the water reservoir 3 through the water distribution pipe 8. The water flowing into and stored in the water storage section 3 is heated by the humidified air generating means 4 to generate steam, and the steam is introduced from the water storage section 3 into the pressurizing chamber 1 to fill it. Humidified air is generated.

  When a DC voltage is applied to the driving device 100 in this state, the vibration plate 101 of the driving device 100 vibrates, the volume in the pressurizing chamber 1 fluctuates due to the amplitude thereof, and the humidified air in the pressurizing chamber 1 from the opening hole 5. Becomes vortex-shaped air and is pushed out of the pressurizing chamber. When the humidified air passes through the opening hole 5 and decelerates in the vicinity of the opening hole edge due to friction with the edge of the opening hole 5 and the wind speed distribution is made between the opening hole center part, A vortex is generated, and vortex ring air is generated as a whole. The generated vortex ring air gradually diffuses from the outer periphery of the vortex ring and translates until the shape of the vortex ring cannot be maintained. Air transported at the point where the vortex ring collapses diffuses and increases the humidity around the vortex ring collapse point.

  Next, the operation of the driving apparatus 100 will be described with reference to FIG. 3 based on the flowchart of FIG. A household power supply signal 51 supplied from a household power supply is generated by an arbitrary waveform generator 52 into a rectangular wave or a sawtooth wave. Since the rectangular wave or sawtooth wave generated by the arbitrary waveform generator 52 becomes a signal having the frequency of the entire band, the high frequency band of this signal is removed by the low-pass filter 53. The signal from which the high frequency band has been removed by the low-pass filter 53 is amplified to 0.2 to 1.5 V by the amplifier 54 and then input to the driving device 100 to vibrate the diaphragm 101. As a result, it is possible to suppress generation of unpleasant noise in the high frequency band generated from the diaphragm 101. In particular, as shown in FIG. 6, the low-pass filter 53 is used to remove a frequency band that is equal to or higher than the natural frequency of the diaphragm 101, thereby reliably preventing a large noise from being generated due to the resonance of the diaphragm 101. And unpleasant noise generated from the diaphragm 101 can be greatly suppressed.

  Further, even if the signal from which the high frequency band has been removed by the low pass filter 53 is boosted by the amplifier 54, the signal generated thereby does not include the high frequency band, and therefore the high frequency band generated from the diaphragm 101 is not included. The excitation force of the diaphragm 101 can be increased while suppressing the generation of unpleasant noise. In particular, by removing the high frequency band equal to or higher than the natural frequency of the diaphragm with the low-pass filter 53, it is possible to easily increase the signal in the low frequency band equal to or lower than the natural frequency of the diaphragm. The exciting force 101 can be increased. For this reason, it is possible to sufficiently carry the humidified air by the vortex ring to a long distance.

  The waveform generated by the arbitrary waveform generator 52 is a sawtooth wave with a large rising input and gradually decaying, so that the diaphragm 101 pushed out by the rising waveform can be slowly returned to the initial position. As a result, it is possible to suppress the phenomenon that the inside of the pressurizing chamber 1 becomes negative pressure due to the vibration plate 101 returning quickly, and the force that returns to the pressurizing chamber 1 side acts on the vortex ring and breaks. Can be performed stably.

  In addition, it is preferable that the low-pass filter 53 has a sharper band cut-off because it can suppress noise generated in the vicinity of the cut-off band. Such control can be performed by using a Chebyshev filter.

  By adding such a control signal, as shown in FIG. 5, a low frequency band of 50 Hz or less where a large excitation force can be obtained is amplified, and a frequency band of more than the natural frequency of diaphragm 101 is cut off. Therefore, it is possible to reduce noise without reducing the ability to convey the vortex ring to an arbitrary area.

Embodiment 2. FIG.
FIG. 7 is a side sectional view showing the overall configuration of the fluid conveyance device, that is, the humidifying device according to the second embodiment of the present invention. In the figure, the same parts as those of the first embodiment are denoted by the same reference numerals. is there. In the description, reference is made to FIG.

  In the humidifier 102 according to the embodiment of the present invention, the driving device 100 and the pressurizing chamber 1 are configured in the same manner as in the first embodiment. However, the input signal 51 from the household power supply is input to the driving device 100 through the amplifier 53 without being limited in frequency band. In the pressurizing chamber 1, a frequency detection microphone 61 is disposed near the diaphragm 101 between the diaphragm 101 and the opening hole 5 of the pressurizing chamber 1, and the speaker 62 is disposed near the opening hole. Has been placed. Other configurations are the same as those of the first embodiment.

  Next, the operation of the humidifier according to the present embodiment will be described based on FIG. 7 with reference to FIG. As described above, since the signal input to the driving apparatus 100 is not limited in frequency band, abnormal noise is generated by propagating from the voice coil bobbin 15 through the diaphragm 101 during excitation. The generated abnormal sound is collected by the frequency detection microphone 61 to acquire frequency data, and a signal having a phase opposite to that of the acquired frequency data is output from the speaker 62 disposed at a position close to the opening hole. This antiphase signal is output only for abnormal noise, and does not affect the normal vibration operation.

  By adopting such a configuration, the abnormal noise generated from the diaphragm 101 is canceled out by a signal having an antiphase near the opening hole, and no sound is generated outside the apparatus. Further, at this time, the speaker 62 that outputs a signal having an opposite phase is disposed inside the opening hole, so that the configuration that does not affect the formation of the vortex ring can be achieved.

  The object of the present invention is not limited to humidified air, and does not refuse to be used as a scent used in aromatherapy, or as a moisture-retaining component typified by hyaluronic acid.

  With the above-described configuration, even if the vortex ring can be transported to a distant arbitrary area by driving with a large vibration amplitude, it is possible to mute the abnormal noise generated at the time of excitation by canceling the signal with an opposite phase.

  As an application example of the present invention, a humidifying device that conveys humidified air, an aroma device that conveys a fragrance component, or an air conditioner equipped with the same can be considered.

  DESCRIPTION OF SYMBOLS 1 Pressurization chamber, 3 Water storage part, 4 Humidified air generating means, 5 Open hole, 6 Water storage tank, 8 Water distribution pipe, 10 York, 11 Center pole, 12 Magnet, 13 Plate, 14 Voice coil, 15 Voice coil bobbin, 16 Viscosity Adhesive layer, 17 frame, 18 edge, 20 diaphragm fixing part, 21 frame fixing part, 22 damper, 30 cabinet, 40 installation piece, 41 air chamber for driving device, 42 back of cabinet, 43 air valve, 51 household power supply Signal, 52 Arbitrary waveform generator, 53 Low-pass filter, 54 Amplifier, 61 Frequency detection microphone, 62 Speaker, 100 Drive device, 101 Diaphragm, 102 Humidifier (fluid transport device).

Claims (4)

A pressurizing chamber having an opening hole;
A driving device for driving the diaphragm forward and backward based on an input signal to pressurize and release the air in the pressurizing chamber from the opening hole;
A fluid conveyance device comprising: a signal transmission unit configured to transmit the input signal from which a frequency component equal to or higher than the natural frequency of the diaphragm is removed to the driving device.   2. The fluid conveyance device according to claim 1, wherein the signal transmitting means further includes an amplifier for transmitting the input signal obtained by amplifying a frequency component equal to or lower than the natural frequency of the diaphragm to the driving device.   The fluid conveyance device according to claim 1, wherein a vibration damping material is applied to a component of the device.   2. The fluid conveyance device according to claim 1, wherein the signal transmission unit transmits the waveform of the input signal to the driving device as a rectangular wave or a sawtooth wave.

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