JP2896286B2 - Ventilation system with silencing function for elevator cars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system having a function of silencing an elevator car.

[0002]

2. Description of the Related Art In recent years, with the rise of buildings, elevators as vertical transportation have been required to have higher speed and higher performance. -With the rise of heads, many technical problems have occurred that were not a problem with conventional models. As a typical example, during high-speed operation of a car, loud noise is generated due to turbulence of airflow generated around the car in the hoistway, and this noise enters the car and gives passengers discomfort. There's a problem.

In particular, when the car and the counterweight pass each other at a high speed, or when the car passes near the protruding portion in the hoistway, the air pressure fluctuates greatly, generating loud noises. Intrusion into the car through the vents of the ventilator provided gives passengers discomfort. For this reason, in order to prevent the noise in the hoistway from entering the car as much as possible, a ventilation device with a sound deadening function has been adopted.

[0004] An example of this will be briefly described with reference to FIGS. 3 and 4. A ventilation fan 4 equipped with a silencer 3 with a sound absorbing material is installed above the ceiling 2 of the elevator car 1, fresh air in the hoistway is taken in by the ventilation fan 4, and this air is passed through the muffler 3. The sound is introduced into the car 1 through the air vent 6 around the lighting case 5 of the ceiling 2 in the car 1 while silencing the sound.

[0005] Further, a labyrinth-like exhaust passage 7 is provided in the lower part of the car 1. That is, as shown in FIG.
A skirting board 8 having a plurality of baffle boards 8a is erected and fixed on the floor board 1a of the car 1 while the cover 9 is bolted and nutd 10 so as to cover the outside of the skirting board 8 from the lower outside of the side plate 1b of the car 1.
The cover 9 is also provided with a plurality of baffle plates 9a protruding from the baffle plate 8a of the baseboard 8 in a staggered state.
A zigzag exhaust passage 7 is formed between the baffle plates 8a and 9a. The air inside the vehicle 1 is exhausted from the exhaust passage 7 so as to escape to the outside, and noise from outside is blocked by the baffle plates 8a and 9a.

By the way, as in such a conventional ventilator having a silencing function for an elevator car, a so-called passive type for suppressing the intrusion of noise into the car 1 by using a silencer 3 having a built-in sound absorbing material and an exhaust passage 7 with a baffle plate. In the (passive) noise control system, the noise reduction effect cannot be expected so much due to these functions. That is, since the silencer 3 is installed above the ceiling 2 of the car 1, its size is limited, and the noise in the low frequency range can hardly be absorbed. In particular, 125 in car 1
H _Z band high noise of the low frequency level, it is important to reduce the noise of the low frequency level, it can not absorb little. Further, the exhaust passage 7 aims at the sound insulation effect of the baffle plate, but has a small sound-muffling effect in spite of the complicated structure. For this reason, it was difficult to sufficiently reduce the noise in the car 1.

Therefore, the present applicant has adopted an active noise control method (ANC; Activ Noise Control), which has already been used to suppress the compressor sound of a refrigerator, for silencing a ventilation system of an elevator car. Tried.

The active noise control system detects a target noise with a sound source detecting microphone (sensing microphone) and analyzes a waveform of the noise with a controller receiving the detection signal. By oscillating and hitting opposite-phase sound waves from the active speaker at the same sound pressure to cancel each other's sounds and mute them, low-frequency noise that is difficult to reduce with ordinary sound-absorbing materials is reduced. Is effective.

[0009]

However, adopting the active noise control method in the ventilation system of an elevator car has the following problems. First, when the noise that enters through the ventilation duct of the ventilator is eliminated by the active noise control method, the time during which the sound passes from the position of the microphone for sound source detection installed in the ventilation duct to the position of the active speaker is set. It is necessary to analyze the detection signal from the sound source detection microphone by the controller and output the required sound wave from the active speaker. It takes a considerable amount of time to output air, and the ventilation duct must be lengthened accordingly.

[0010] However, the space above the ceiling of the elevator car is limited, and if a long ventilation duct is installed, it will protrude around the car and obstruct other equipment in the hoistway. Cannot be installed, and active control of noise cannot be obtained well.

In addition, due to the high speed and high lift of the elevator installed in the high-rise building, the change in the air pressure between the lower floor and the higher floor due to the raising and lowering of the car in the hoistway is large. A pressure difference occurs between the front side and the back side of the active speaker that oscillates sound waves in the duct, and the characteristics of the speaker change, but sound waves cannot be output according to the output signal from the controller. Control cannot be performed properly.

The present invention has been made in view of the above circumstances, and an object of the present invention is to appropriately reduce noise generated in a hoistway and from a ventilation fan and going into a car through a ventilation duct. An object of the present invention is to provide a ventilator with a silencing function for an elevator car which is effective for obtaining a quiet and comfortable high-speed elevator with low noise.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the ventilator with silencing function for an elevator car according to the present invention is provided with a ventilation fan above the ceiling of the car and is taken in by the ventilation fan. A ventilation duct that conducts fresh air into the car is bent and provided above the car ceiling, and the long ventilation duct is provided with a sound absorbing material for absorbing high-frequency noise and an active noise control means for reducing low-frequency noise. It is characterized by comprising.

With this configuration, a long ventilation duct can be secured above the ceiling without protruding outward from the periphery of the car ceiling and obstructing other equipment in the hoistway.
Since the sound absorbing material can be stuck on the entire length of this long ventilation duct, it can reliably absorb and reduce high-frequency noise generated in the hoistway and from the ventilation fan and trying to enter the car through the ventilation duct. become able to.

Further, since the ventilation duct is long, the distance between the microphone for sound source detection and the active speaker installed in the ventilation duct is set to be sufficiently long, and the microphone for sound source detection is set within a time period during which sound passes between them. The controller detects the signal detected in the above and analyzes the waveform of the noise, so that sound waves having the same sound pressure and opposite phase can be accurately oscillated from the active speaker, thereby canceling each other's sounds. The noise can be reduced, and the noise in the low frequency range, which is difficult to reduce with the sound absorbing material, can be reliably and actively controlled to greatly reduce the noise. That is, in the ventilation duct, the noise of the following low-frequency region 600H _Z is actively controlled by active noise control means, more noise high frequency range is absorbed by the sound absorbing material, to be able to reliably reduce a wide range of noise become.

By providing a flow straightening plate in a bent portion of the long ventilation duct, turbulence of air flow can be prevented.
The sound correlation can be achieved between the position where the sound in the ventilation duct is detected by the microphone for sound source detection and the position where the active speaker hits the opposite phase sound to mute the sound. That is, spatial coherence is obtained in the flow direction of the airflow in the ventilation duct, and the above-described active control of noise can be performed more accurately. In addition, since the flow path resistance at the bent portion of the ventilation duct is reduced by the rectifying plate, it is preferable from the aspect of ensuring the flow rate of the ventilation in the car.

Further, by arranging and communicating the ventilation ducts in two upper and lower stages, the space above the ceiling of the car can be three-dimensionally utilized, the ventilation duct can be further extended, and a sound absorbing material is provided over the entire length of the interior. This can increase the noise absorbing effect.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 shows a ceiling 1 of an elevator car 11.
2 shows a plan view of a state in which the ventilation device with a sound deadening function of the present invention is installed on the upper part, and FIG. 2 shows a partial longitudinal sectional view similarly viewed from the front side thereof.

In this embodiment, an air supply system for conducting fresh air into the car 11 as a ventilation device with a sound deadening function,
An exhaust system for exhausting the air in the car 11 to the outside is provided.

The air supply system includes the ceiling 12 of the car 11
And an air supply ventilation fan (blower) 14 installed on the vertical axis near the center of the upper front end, and upper and lower two-stage air supply ducts 15 and 16 connected to the ventilation fan.

The upper air supply ventilation duct 15 has a base end connected to the upper suction port 14 a of the air supply ventilation fan 14.
It is a bent and long structure that stands up a little from here, extends horizontally to the left, bends there, and extends horizontally rearward to open the tip. The lower air supply ventilation duct 16 is
The base end is connected to the discharge port 14b right beside the ventilation fan 14 for air supply, and extends horizontally to the left from here, and bends there to extend horizontally further rearward.
1 is a bent and long structure connected to an air supply port 17 provided on the left side of the ceiling 12.

That is, upper and lower air supply ventilation ducts 1
5 and 16 are both bent horizontally and extended, and cage 1
The length is set to a range that does not protrude from the periphery of the first ceiling 12 and that does not abnormally increase upward. The air supply port 16 communicates with the inside of the car 11 via a space 19 around the ceiling lighting case 18 in the car 11.

The exhaust system includes an exhaust ventilation fan (blower) 2 installed substantially vertically symmetrically with respect to the air supply system, at a position near the center of the upper front end of the ceiling 12 of the car 11 in the vertical direction.
And two upper and lower exhaust ventilation ducts 25 and 26 respectively connected to the exhaust duct 4 and exhaust ventilation ducts 25 and 26.

The upper-stage exhaust ventilation duct 25 has a base end connected to the upper discharge port 24a of the exhaust ventilation fan 24,
This is a bent long structure in which it stands slightly up, extends horizontally to the right, bends there and extends horizontally rearward, and has an open end. The lower exhaust ventilation duct 26 is
The base end is connected to the suction port 24b right beside the exhaust ventilation fan 24, extends horizontally to the right from here, bends therefrom and extends horizontally further rearward, the lower end of which is the ceiling of the car 11 12 is a bent and long structure connected to an exhaust port 27 erected on the right side of FIG.

That is, the upper and lower two-stage exhaust ventilation duct 2
Like the above-mentioned air supply system, each of the air supply systems 5 and 26 is bent horizontally and extended so as not to protrude from the periphery of the ceiling 12 of the car 11 to the outside and not to be abnormally high. Is set. The exhaust port 27 communicates with the inside of the car 11 via a space 29 around the ceiling illumination case 18 inside the car 11.

By operating the air supply ventilation fan 14, fresh air in the hoistway is supplied to the upper air supply ventilation duct 1.
5 is taken in from the front end, is introduced into the car 11 from the air supply port 17 through the lower air supply ventilation duct 16 through the ventilation fan 14, while the car 11 is operated by the operation of the exhaust ventilation fan 24. The inside air is led out of the exhaust port 27 into the lower exhaust ventilation duct 26, passes through the upper exhaust ventilation duct 25 through the ventilation fan 24, and is exhausted to the outside from the tip through the inside of the car 11. Is forcibly ventilated.

Here, a sound absorbing material (not shown) for absorbing high-frequency noise is provided on the inner surfaces of the ventilation ducts 15, 16, 25, and 26, which are set to be long as described above, over the entire length. Have been.

Along the long ventilation ducts 16 and 26 for the air supply and the exhaust, ANC equipment as active noise control means (Activ Noise Control) for reducing low-frequency noise, That is, a microphone 31 for sound source detection (sensing microphone), an active speaker 32, and a microphone 33 for evaluation are attached to each. Also, ANC
The equipment controller 34 is the ceiling 1 of the car 11.
2 and are wired and connected to each of the above-described ANC devices so that signals can be transmitted and received as indicated by broken lines.

The sound source detecting microphone 31 is installed near each of the ventilation fans 14 and 24 of the lower ventilation ducts 16 and 26 for air supply and exhaust, respectively, and detects noise passing through its internal position. I do.

The active speakers 32 are installed near the air inlet 17 and the air outlet 27 at the ends of the lower ventilation ducts 16 and 26 for air supply and exhaust, respectively.
A sound wave is oscillated toward the internal position. The active speaker 32 analyzes the waveform of the noise in the duct by the controller 34 which receives the detection signal of the microphone 31 for detecting the sound source, and oscillates the sound in the duct with the same sound pressure and the opposite phase to the noise in the duct based on this. It works to cancel each other's sounds and mute them.

The evaluation microphone 33 is connected to the active speaker 3 at the tip of each of the lower ventilation ducts 16 and 26.
2 is further provided near the air supply port 17 and the exhaust port 27 side, and the active speaker 32 is used to detect again the muffled sound which is hit by the opposite sound wave at the same sound pressure and reduced. The function of feeding back to the speaker 34 to correct the sound oscillating from the active speaker 32 is performed.

In the air supply duct 16 and the exhaust duct 26, the flow of the air flow is reversed, and the noise generated by the hoistway and the ventilation fans 14 and 24 and entering the duct is reduced. Since the frequency range and the sound pressure level are different, active control of noise is separately performed by the controller 34 in the supply system and the exhaust system.

In particular, a plurality of straightening plates 3 are provided in the bent portion 16a in the middle of the lower ventilation duct 16 for supplying air.
5 are attached in parallel along the curved surface at equal intervals to suppress turbulence in the airflow in the ventilation duct 16 and
The sound of the sound source detection microphone 31 and the sound of the active speaker 32 are correlated so that C works effectively.

Further, the active speakers 32 attached to the leading end portions of the lower and upper ventilation ducts 16 and 26 for the air supply and the exhaust are covered with a box 36 from the outside, and are provided with a high lift elevator car. Even if the internal pressure of the hoistway fluctuates with the vertical movement, the pressure difference between the front side 32a and the rear side 32b of the speaker 32 is not changed.

With the above configuration, when the ventilation fans 14 and 24 are operated to ventilate the car 11 and operate the elevator to raise and lower the car 11, the car 11 is generated in the hoistway. The noise generated from the ventilation fans 14 and 24 and the ventilation ducts 15 and 16 and 25 and 26
Although it is attempted to enter the inside of the car 11 through the inside, the noise is surely reduced.

That is, the ventilation ducts 15, 16 and 25,
26 are bent in the middle and arranged in two stages, so that air does not protrude around the ceiling 12 of the car 11 or become abnormally high to obstruct other equipment in the hoistway, and air supply is performed. A long ventilation duct can be secured in both the system and the exhaust system, and a sound absorbing material can be attached to the entire length of the long ventilation duct, so the sound absorbing area is long, and the ventilation duct generated from the hoistway and the ventilation fan It is possible to reliably absorb and reduce high-frequency noise that is going to enter the car 11 through the inside.

Further, since the ventilation ducts 16 and 26 are bent and sufficiently long, the mutual distance between the sound source detection microphone 31 and the active speaker 32 installed in each of the ventilation ducts 16 and 26 can be set sufficiently long. During the time when the sound passes, the controller 34 receives a signal obtained by detecting noise by the microphone 31 for sound source detection, analyzes the waveform of the noise, and applies a sound wave having the same sound pressure and opposite phase from the active speaker 32. Oscillation can be ensured. As a result, the sound in the duct is canceled out to muffle the sound, and the noise in the low frequency range, which is difficult to reduce with the sound absorbing material, can be reliably and actively controlled to greatly reduce the noise.

Further, the sound remaining in the duct is detected by the evaluation microphone 33 and fed back to the controller 34.
Correct noise control is performed while correcting the sound oscillating from the active speaker 32.

[0039] Thus in a ventilation duct, noise 600H _Z following low frequency region is actively controlled by active noise control means, more noise high frequency range is sufficiently absorbed by the sound absorbing material, to ensure a wide range of noise It can be reduced. Incidentally, within the cage 11 to obtain the effect of reducing the Otay 5~10dB to 60～600Hz, largest 125H _Z
The noise at the low frequency level of the band can be reliably reduced.

By providing the rectifying plate 35 in the bent portion 16a in the middle of the long ventilation duct 16 as described above, the turbulence of the airflow can be prevented, and the sound in the ventilation duct 16 can be detected by the sound source detection microphone 31. The correlation between the sound can be achieved between the position where the sound is detected and the position where the sound of the opposite phase is hit by the active speaker 32 to mute the sound. That is, spatial coherence is obtained in the flow direction of the airflow in the ventilation duct, and the above-described active control of noise can be performed more accurately. Further, since the flow path resistance of the bent portion 16a of the ventilation duct 16 is reduced by the rectifying plate 35, it is preferable from the viewpoint of securing the flow rate of the ventilation in the car.

The ventilation duct 16 in the upper part of the air supply system shown in FIGS. 1 and 2 can be omitted, and the ANC equipment provided in the ventilation duct 26 in the lower part of the exhaust system, ie, the sound source detection The microphone 31, the active speaker 32, and the evaluation microphone 33 may be omitted. Thus, the noise in the car 11 can be considerably reduced.

[0042]

As described above, the ventilation system with muffler function of the elevator car according to the present invention is constructed as described above, so that it does not protrude around the ceiling of the car and obstruct other equipment in the hoistway. A long ventilation duct can be ensured, and a sound absorbing material can be attached to the entire length of the long ventilation duct to reliably absorb and reduce high-frequency noise, and the distance between the microphone for sound source detection and the active speaker Can be set long enough, and within the time during which the sound passes, the signal detected by the microphone for sound source detection is received by the controller and the waveform of the noise is analyzed, and a sound wave having the same sound pressure and the opposite phase is generated. Oscillation can be performed accurately from the active speaker, thereby canceling out each other's sound, thereby suppressing noise in the low-frequency range and reliably reducing the noise.

That is, the noise generated from the hoistway and the ventilation fan and going into the car through the ventilation duct can be reliably reduced in the ventilation duct in a wide range from low frequency to high frequency. Therefore, it is effective to obtain a quiet and comfortable high-speed elevator with little noise.

Further, by providing a rectifying plate in a bent portion in the middle of a long ventilation duct, turbulence of the air flow can be prevented, and the sound in the ventilation duct is detected by a microphone for sound source detection and the active speaker has an opposite phase. The sound can be correlated with the position where the sound hits, spatial coherence can be obtained in the flow direction of the air flow in the ventilation duct, active control of noise can be performed more accurately, and the bent part of the ventilation duct The flow path resistance can be reduced, and it is also effective in securing the flow rate of ventilation in the car.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a ventilation device with a sound deadening function for an elevator car according to the present invention.

FIG. 2 is a partial sectional view of the embodiment.

FIG. 3 is a schematic sectional view of a car having a conventional ventilation device with a sound deadening function.

FIG. 4 is a partial detailed sectional view of the conventional example.

[Explanation of symbols]

11 ... basket, 12 ... ceiling, 14, 24 ... ventilation fan, 1
5, 16, 25, 26 ... ventilation duct, 31. 32, 3
3, 34: Active noise control means (31: microphone for sound source detection, 32: active speaker, 33: evaluation microphone, 34: controller.

Continuation of the front page (56) References JP-A-63-139891 (JP, A) JP-A-4-209188 (JP, A) JP-A-49-148648 (JP, U) Japan Society of Mechanical Engineers No. Proceedings of 936 Technology Lecture “Recent Technologies and Advances in Elevators and Amusement Facilities” (February 22, 1993), 108 Ultra-high-speed elevator noise reduction technology, Japan Society of Mechanical Engineers 31-34 Page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66B 11/20

Claims (3)

(57) [Claims] 1. A ventilation fan is provided above the ceiling of a car, and a ventilation duct for conducting fresh air taken in by the ventilation fan into the car is provided at the upper part of the car so as to be bent and long. A ventilation device with a silencing function for an elevator car, wherein a duct is provided with a sound absorbing material for absorbing high frequency noise and an active noise control means for reducing low frequency noise. 2. The ventilator according to claim 1, wherein the ventilation duct is provided with a flow straightening plate in a bent portion on the way. 3. The ventilator according to claim 1, wherein the ventilation ducts are arranged in two upper and lower stages so as to communicate with each other.