JP3048773B2 - Air conditioning outdoor unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a silencer configured to actively cancel noise to reduce noise including a sound from a compressor of an air conditioner outdoor unit, and an air conditioner outdoor using a control device therefor. It is about the machine.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the noise of an air conditioner, a passive method of sound absorption, sound insulation and the like together with sound source control such as stopping vibration which is a noise source of an air conditioner has been performed. However, in recent years, active methods for canceling sound with sound using the wave nature of sound have been attempted. In these active noise reduction methods, a one-dimensional sound reduction control method such as an air conditioning duct has already been put to practical use.

Further, in the contents disclosed in the official gazette (Hei 2-97877) and the like, in a refrigerator or the like, in order to cancel the noise of the compressor, the machine room is closed leaving a heat radiation opening, and the light propagates through the opening. The noise reduction control method is shown as a one-dimensional sound wave of noise.

[0004]

SUMMARY OF THE INVENTION However, in general ,
The air conditioner, for connection between the machine room and the heat exchanger, piping holes through which pipe there is a machine room. From this hole,
Although noise from the machine room including the compressor leaks, this piping hole cannot be filled for reasons such as vibration, cost, and maintenance. Also, unlike the refrigerator, the installation position of the air-conditioning outdoor unit is often left outdoors, and is easily affected by bad weather such as rain and wind. Becomes In the air-conditioning outdoor unit, the conventional technology is not enough to actively perform the silencing control.

[0005] The above problems cannot be solved by the prior art, and the present invention seeks to solve these problems.

That is, in the air-conditioning outdoor unit, a piping hole for passing piping from the machine room for connection between the machine room and the heat exchanger is provided. However, the present invention reduces noise including the compressor from the hole. In order to actively control the sound as a one-dimensional sound wave, the sound generating means is provided in the pipe hole so that the sound propagated from the pipe hole can be actively eliminated. Further, the present invention also provides a technique for making the apparatus less susceptible to rain and wind even when left outdoors in poor conditions. An air conditioner that also realizes a stable and active silencing control method even in situations where the outside air changes drastically, such as humidity and temperature, reduces costs and takes into account the effectiveness of each device used in active silencers. The purpose is to provide.

[0007]

In order to achieve the above object, an air conditioner outdoor unit according to the present invention provides a waveform signal obtained by the noise detection means based on output signals of the noise detection means and the noise reduction effect detection means. In the air-conditioning outdoor unit having a built-in active silencer composed of a controller for processing the sound and sounding means for outputting the signal as a sound wave, electromagnetic sound, periodic sound such as blade rotation sound, or random sound such as refrigerant flow sound In order to largely eliminate sound, at least one of the sounding means and the muffling effect detecting means are used, and a pipe surrounding the compressor or a pipe connecting the machine room and the heat exchanger is passed through the machine room. In the vicinity of the provided pipe hole, the muffling effect detecting means is provided, and the noise transmitted from the pipe hole is actively eliminated and the sound from the machine room including the compressor, the pipe, the electric box and the like can be muffled. With, before Sound generating means is arranged downward, emitting sound
Prevents rainwater from entering the means and does not cause deterioration of equipment characteristics
It is characterized by having a configuration .

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

According to the active control of noise according to the present invention, since the muffling effect detecting means is provided near the pipe hole so as to muffle the noise at the position of the pipe hole,
The noise in the machine room including the compressor is prevented from being radiated outside through the piping hole. Further, by installing the sounding means downward, rainwater falls down,
Intrusion of rainwater or the like into the sounding means can be prevented, and characteristic deterioration of the sounding means can be prevented.

[0019]

[0020]

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of an air conditioner using an active silencer according to the present invention. In the air conditioner outdoor unit 1, the compressor 2 is entirely cooled to muffle noise from the compressor 2. It is covered with a cylinder 3 made of resin or steel, and a speaker as sounding means 4 is installed on the upper side thereof facing downward.

Further, a vibration pickup is used as the noise detecting means 5 so that noise composed of vibration of the compressor body can be detected. Further, for example, an inexpensive condenser microphone is used as the noise effect detecting means 7.
Is installed in a pipe hole 6 through which the pipe 10 passes, so that the noise radiated from the pipe hole 6 can be detected, and the noise reduction effect by the sound wave from the sound generating means 4 is confirmed.

Since the controller 8 is made compact as shown in the drawing, it can be installed at the same or near the electric box 9 of the outdoor unit 1.

FIG. 2 shows the components required for the active noise reduction shown in FIG. 1 and the connection state thereof. As shown in the drawing, the components are composed of several simple parts. The mounting to the machine 1 is free and easy, and not only can the active silence system be retrofitted, but also the standardization with and without the active silence system is possible, so that the cost can be reduced. . The sounding means 4 shown in FIG. 2 is provided with a microphone holding tube 11 so that a condenser microphone can be easily installed.

FIG. 3 is a view showing another embodiment of the air-conditioning outdoor unit according to the present invention.
Is divided into a machine room 13 including the compressor 2 and a blower room having a heat exchanger. Here, in order to mitigate the noise from the compressor 2, a vibration pickup is used as the noise detection means 5 so that noise composed of vibration of the compressor body can be detected. The compressor 2
In the upper part of the machine room 13 including the
In addition, an inexpensive condenser microphone is installed in the pipe hole 6 for passing the pipe 10 of the machine room 13 as the noise effect detecting means 7, and The radiated noise can be detected,
The sound deadening effect by the sound wave from the sound generator 4 is confirmed.

Further, since the sound propagation time between the noise detecting means and the sound generating means is configured to be longer than the processing time in the controller, random noise can be eliminated as a result.

FIG. 4 shows the components required for the active noise reduction shown in FIG. 3 and the connection state thereof. Since the components are composed of three simple parts, they can be mounted on the outdoor unit 1. Free and easy to do. In this example, the controller 8
Is installed in the sound generating means 4, so that the components as a compact active silence system are further simplified, and the mounting to the air conditioner outdoor unit 1 can be freely and easily performed. Since it is easy to retrofit and standardize whether or not an active silence system is provided, cost reduction is further realized.

FIG. 5 shows an embodiment in which noise generated from a pipe hole for leading out a pipe for connecting the air conditioner outdoor unit 1 and the air conditioner indoor unit to the outside is actively silenced. This includes the sounding means 4 and the control
The pipe through tube 14 with a built-in la 8 is used.
This is also compact, and can be easily retrofitted as an active silencer, resulting in cost reduction.

FIG. 6 is a cross-sectional view of the air-conditioning outdoor unit 1 showing various modes when the active noise reduction according to the present invention is applied to the air-conditioning outdoor unit 1. In FIG. 7, the machine room is partitioned by a double wall, and the inside of the machine room is configured as a duct through which sound waves from the sound generating unit 4 can propagate. It is also possible to prevent howling occurring between the sound generating means 5 and the sound generating means 4. The low frequency sound is an active type silencer, and the high frequency sound is silenced by sound absorption and sound insulation by a sound absorbing material. Control becomes possible. Here, a microphone is used as the noise detection means 5 so that all noise from the machine room 13 can be detected.

8 and 9, the machine room 13 is formed in a U-shape or an L-shape so that one-dimensional sound waves are generated in the machine room. Can be changed to various places.

In each of the embodiments shown in FIGS. 1 to 8, the loudspeaker, which is the sound generating means 4, is installed at the upper part so as to face downward, so that the rainwater is supplied to the loudspeaker even in bad weather such as rain and wind. To prevent the speaker characteristics from deteriorating. Therefore, active noise can be eliminated even with the noise of a machine installed in a bad environment such as the air-conditioning outdoor unit 1 or the like. These contrivances can be applied to the reduction of each machine noise other than the air conditioner and are the same technology, and the present invention includes the case where they are applied to the reduction of each machine noise other than the air conditioner.

FIGS. 10 and 11 show the relationship between signal processing means from each device when performing active silencing according to the present invention.

In FIG. 10, reference numeral 30 denotes a mixer, 31
Denotes a filter, 32 denotes LMS (least mean square) control means, and incorporates a DSP (real time signal processing means), 33 denotes a pressure sensor, and 34 denotes a memory. The noise detection means 5
A microphone or a vibration pickup and a pipe vibration pickup are used for the compressor, and they are gathered by a mixer 30 and passed through a filter 31 composed of a correlation function between vibration and noise. Data of a close sound can be collected, and accurate sound processing can be performed. Although not particularly shown in the figure,
When an inverter is installed, the power supply frequency of the inverter output signal is also picked as the silencing effect detection means 7,
Noise from the inverter can also be controlled.

In FIG. 11, 41 is a temperature or humidity sensor, 42 is a memory, 43 is LMS control means, and 44 and 45.
Is an adaptive filter. In the configuration shown in FIG. 11, further, when the outside air changes rapidly such as humidity and temperature, the humidity in the machine room 13 or the duct in the duct is reduced.
By storing the transfer function of the temperature in the memory 42 in advance and providing a configuration for selecting the humidity or temperature at that time by the adaptive filter 44, the optimum transfer function can be designated at any time even in bad weather conditions. Therefore, stable noise reduction control is realized.

The present invention can be implemented in other types of air conditioners, and their application is also included in the present invention.

[0036]

As described above, according to the present invention, the noise from the piping hole 6 in the machine room 13 including the compressor 2 is actively reduced in contrast to the active control of the noise only by the prior art. The sound can be muted, and as in the air conditioner outdoor unit 1,
Even if the influence of rain water is left in the prone bad weather receiving, in any weather for any time optimal transfer function is specified, a stable noise reduction control is achieved, moisture, severe conditions such as temperature outside air air change Even below, the characteristic deterioration of each device required for active control is also prevented. In addition, since each device is compact and has a structure that can be detached and attached even later, it is possible to share an active silence system with and without an active silence system, thereby realizing cost reduction.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an air-conditioning outdoor unit using an active silencer according to the present invention.

FIG. 2 is a diagram showing devices required for active silencing shown in FIG. 1 and their connection states;

FIG. 3 is a diagram showing another example of an air-conditioning outdoor unit using the active silencer according to the present invention.

FIG. 4 is a diagram showing each device necessary for the active silencing shown in FIG. 3 and a connection state thereof.

FIG. 5 is a diagram showing an embodiment in a case where noise generated from a pipe hole is actively silenced.

FIG. 6 is a diagram showing various aspects of active noise reduction in an air conditioner outdoor unit.

FIG. 7 is a diagram showing an embodiment in which the machine room in the air-conditioning outdoor unit is doubled.

FIG. 8 is a view showing an embodiment in which a machine room of the air-conditioning outdoor unit has a U-shape.

FIG. 9 is a diagram showing an embodiment in which the machine room in the air-conditioning outdoor unit has an L-shape.

FIG. 10 is a diagram illustrating an example of a processing unit of a signal from each device in the air-conditioning outdoor unit.

FIG. 11 is a block diagram showing another example of the processing means of the signal from each device in the air-conditioning outdoor unit, in which an optimal transfer function is designated at any time according to humidity and temperature in the air-conditioning outdoor unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air conditioning outdoor unit 9 ... Electric box 2 ... Compressor 10 ... Piping 3 ... Tube 11 ... Microphone holding tube 4 ... Sound generation means (speaker) 12 ... Heat exchanger 5 ... Noise detection means (pickup) 13 ... Machine room 6 ... Piping hole 14 ... Pipe through hole 7 ... Sound-absorbing effect detecting means (microphone) 15 ... Sound absorbing material 8 ... Controller

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor: Mitsuru Nakamura 2520, Oaza, Kata-shi, Ibaraki Pref.Hitachi, Ltd.Automotive Equipment Division (72) Inventor: Hiroto Akutsu 1070, Ma, Katsuta-shi, Ibaraki Co., Ltd. Inside the Mito Plant of Hitachi, Ltd. Inside the factory (72) Inventor Takeshi Hida 390 Muramatsu, Shimizu-shi, Shizuoka Pref. Inside the Shimizu Factory, Hitachi, Ltd. (56) References JP-A-3-76500 (JP, A) JP-A 1-298898 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 5/00 G01H 3/00 G10K 11/16

Claims (1)

(57) [Claims] 1. An active type comprising a controller for processing a waveform signal obtained by the noise detecting means based on output signals of the noise detecting means and the silencing effect detecting means, and a sound generating means for outputting the signal as a sound wave. In an air conditioner outdoor unit with a built-in silencer, at least one sound is required to largely eliminate periodic noise such as electromagnetic noise and blade rotation noise or random noise such as refrigerant flow noise.
In order to pass a pipe surrounding the compressor or a pipe connecting the machine room and the heat exchanger using the sound generating means and the muffling effect detecting means, the muffling effect is provided near a pipe hole provided in the machine room. Detecting means is provided, which actively cancels noise transmitted from the pipe hole, makes it possible to muffle sound from a machine room including a compressor, a pipe, an electric box, and the like, and the sounding means faces downward.
To prevent rainwater from entering the sounding means,
An air-conditioning outdoor unit characterized in that it is configured not to deteriorate .