JPH08170838A - Structure of indoor unit for air conditioner - Google Patents

Abstract

PURPOSE: To reduce jarring noise without deteriorating an efficiency by a method wherein the fan blade of a cross-flow fan is detected to effect predetermined process and, thereafter, the fore end of a nose unit, extended from the main body of a unit to the side of the cross-flow fan, is advanced or retreated with respect to the cross-flow fan. CONSTITUTION: The heat exchange of air, taken into a cross-flow fan 15 through a suction port 7 by the rotation of the fan 15, is effected when the air is passed through a heat exchanger 13, then, the air is sent out of an outlet port 9. During this operation, a fan blade position detecting device 35 detects the fan blade 23 of the cross-flow fan 15 and a processing device 41 effects a process such as amplifying, waveform shaping and the like with respect to a signal from the fan blade position detecting device 35. Then, an output device 29 advances or retreats the tip end unit 25 of a nose part 11 with respect to the cross-flow fan 15 based on a signal from the processing device 41. According to this method, jarring noise of operation can be reduced without deteriorating the efficiency of the fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit structure of an air conditioner capable of suppressing operating noise.

[0002]

2. Description of the Related Art Generally, an outline of an indoor unit of an air conditioner is as shown in FIG.
Inside the unit main body 107 having
A cross flow fan 113 provided with fan blades 111 at predetermined intervals, and a nose portion 115 extending from the unit body 107 toward the cross flow fan 113 side and forming a guide surface toward the outlet 103. There is.
As a result, the suction port 1 is rotated by the rotation of the cross flow fan 113.
The air taken in from 01 is heat-exchanged when passing through the heat exchanger 109, and is blown out from the air outlet 103.

[0003]

The cross flow fan 113 is
Since the fan blades 111 are provided at predetermined intervals, each fan blade 111 has a region where the flow velocity is fast and a region where the flow velocity is slow, and a vector showing the flow velocity is shown in FIG.

When the flow velocity is represented by a line connecting the tips of the vectors, the portion where the fan blade 111 is located is slow, and the space between the fan blade 111 and the fan blade 111 is fast. You can see that it occurs. Therefore, when each fan blade 111 passes through the nose portion 115 during rotation of the cross flow fan 113, the nose portion 115 undergoes periodic pressure fluctuations, and this pressure fluctuation is a single sound. The noise is emitted from the outlet 103 as an offensive noise.

Conventionally, as one means for solving this problem, for example, by making the intervals of the fan blades 113 uneven, it is possible to eliminate a periodic pressure fluctuation. However, the optimum design conditions are set so that the intervals of the fan blades 111 are substantially equal, and making the intervals of the fan blades 111 unequal results in deviation from the optimum design conditions. The current situation is that efficiency has declined.

Therefore, it is an object of the present invention to provide an indoor unit structure of an air conditioner capable of suppressing annoying noise to a low level without reducing efficiency.

[0007]

To achieve the above object, according to the present invention, a heat exchanger and a fan blade are provided at a predetermined interval in a unit main body having an inlet and an outlet. In an indoor unit provided with a possible cross-flow fan, and a nose portion extending from the unit body toward the cross-flow fan, between the suction port and the air outlet.
A fan blade position detection device that detects a fan blade of the cross-flow fan, a processing device that processes a detection signal from the fan blade position detection device, and a front end portion of the nose portion that cross-flows based on a signal from the processing device. An output device for moving the fan at least forward and backward is provided.

The fan blade position detecting device detects an optical sensor consisting of a light emitting section for emitting light to the fan blade and a light receiving section for receiving the light hitting the fan blade, or pressure fluctuation generated at the front end of the nose section. It is preferable that the microphone be a microphone.

As the output device, it is also possible to generate an interference wave having a phase opposite to the pressure fluctuation generated at the front end portion of the nose portion.

[0010]

According to such an air conditioner, the air taken in from the suction port is exchanged with heat when passing through the heat exchanger by the rotation of the crossflow fan, and is blown out from the blowout port. During this operation, when each fan blade passes through the nose portion, the pressure fluctuation generated at the front end portion of the nose portion is suppressed to be small, and as a result, annoying noise can be reduced. Further, it becomes possible to form the fan blades at even intervals so as to enter the optimum design condition, and the efficiency is not lowered.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to FIGS.

In the figure, reference numeral 1 shows an indoor unit of the air conditioner 3. The front surface of the unit body 5 of the indoor unit 1 is a suction port 7 having a plurality of slits. Further, the lower surface side is an air outlet 9 having a plurality of louvers 9a, and the suction port 7 and the air outlet 9 are separated by a nose portion 11.

Inside the unit body 5, a heat exchange 13 serving as an evaporator and a cross flow fan 15 are arranged and set.

The heat exchanger 13 is composed of a heat transfer tube 17 bent in a dogleg shape and through which a refrigerant flows and a large number of fins 19, and air taken in from the suction port 7 passes between the fins 19 and the fins 19. When passing, it functions to remove the latent heat of vaporization from the refrigerant flowing in the heat transfer tube 17 through the fins 19 to cool the air into cold air.

The cross flow fan 15 has a shape in which a fan blade 23 is provided at a predetermined interval on a fan body 21, and the suction port 7 is rotated by rotating in the direction of an arrow (FIG. 1A).
The air taken in passes through the heat exchanger 13 and is blown out from the blowout port 9.

On the other hand, the front end portion 25 of the nose portion 11 is formed separately from the nose portion main body 27, and by the output device 29,
The fan blade 23 of the cross flow fan 15 can be moved forward and backward in the arrow B direction.

The output device 29 includes a solenoid coil portion 31.
And solenoid pin 33, and is arranged in the nose portion main body 27. The solenoid pin 33 has a nose portion 11
Is integrally connected to the front end portion 25 of the.

The solenoid coil portion 31 functions to move the solenoid pin 33, that is, the front end portion 25 of the nose portion 11 in the arrow B direction based on the detection signal from the fan blade position detecting device 35.

The fan blade position detecting device 35 is an optical sensor consisting of a light emitting section 37 for emitting light to the fan blade 23 and a light receiving section 39 for receiving the light hitting the fan blade 23. The fan blade 23 passing through is detected, and the detection signal is output to the solenoid coil unit 31 via the processing device 41.

As shown in FIG. 2, the processing device 41 amplifies and conditions the signal from the fan blade position detection device 35 to prepare for the next processing, and the signal from the amplification and waveform shaping part 43. Has a signal delay unit 47 for delaying by the output of the calculation unit 45, and an amplification unit 49 for receiving the output of the signal delay unit 47 and driving the output device 29 described above. The calculation unit 45 measures the passage interval of the fan blades 23, calculates the time required to move the front end portion 25 of the nose portion 11 after detecting the position of the fan blades 23, and calculates the value as the signal delay portion. Function to output to 47.

More specifically, as shown in FIG. 6, the solenoid pin 33 is retracted when a mountain region where the flow velocity between the fan blades 23 and the fan blades 23 is high comes.

In this case, for example, as shown in FIG. 3, the front end portion 25 of the nose portion 11 is eccentrically supported by the cam portion 42 driven by the output device 29 so as to be eccentrically rotatable in the arrow C direction, and the flow velocity increases. It is also possible to prevent the pressure fluctuation from occurring by eccentrically rotating when the region of comes.

In the present invention, the fan blade 23
When the time when the position is detected is close to the time when the front end portion 25 of the nose portion 11 is moved, that is, when the delay time in the signal delay unit 47 is short, and the fan blade position detection device 35 can be installed in such a positional relationship. Is the signal delay unit 4
7 and the calculation unit 45 can be omitted.

According to the indoor unit structure thus constructed, the air taken in from the suction port 7 is heat-exchanged when passing through the heat exchanger 13 by the rotation of the cross flow fan 15, and the heat is exchanged. The fresh air is blown out from the air outlet 9. During operation of the cross flow fan 15, the front end portion 25 of the nose portion 11 repeats advance / retreat (arrow B in FIG. 1) corresponding to a high flow velocity region and a low flow velocity region generated by the fan blades 23. A large pressure fluctuation does not occur in the nose portion 11, and a jarring noise can be suppressed with a single sound. In addition, the fan blades 23 can be formed into a shape having an equal interval that enters the optimum design condition, and the efficiency is not lowered.

FIG. 4 shows a second embodiment.
In this embodiment, the fan blade position detecting device 35 is provided with the microphone 51, and the output device 29 is provided with the speaker 5.
3 are adopted respectively.

The microphone 51 is arranged in the nose portion 11 and functions to detect the pressure fluctuation input through the guide hole 55.

The speaker 53 is arranged in the nose section 11 and outputs an interference wave b which respectively interferes with the high-velocity mountain region a generated by the fan blade 23 in response to the pressure fluctuation detected by the microphone 51. To function.

Since the other constituent elements are the same as those of the above-mentioned embodiment, the same reference numerals are given and detailed description thereof will be omitted.

According to this embodiment, the fan blade 23
The pressure fluctuation generated by the interference with the interference wave b can suppress a single jarring noise generated in the nose portion 11.

[0030]

As described above, according to the present invention, it is possible to suppress a single jarring noise generated by hitting the nose portion, and to obtain an indoor unit with low driving noise. Become. Moreover, it is possible to form the fan blades at even intervals so as to enter the optimum design condition, and the efficiency is not lowered.

[Brief description of drawings]

FIG. 1 is a cutting explanatory view of an indoor unit embodying the present invention.

FIG. 2 is a block diagram of a processing device.

FIG. 3 is a sectional view showing another embodiment of the output device.

FIG. 4 is a cutting explanatory view similar to FIG. 1 showing a second embodiment.

FIG. 5 is a cutting explanatory view of an indoor unit showing a conventional example.

FIG. 6 is an explanatory view showing a flow velocity generated by a fan blade.

[Explanation of symbols]

 1 Indoor Unit 5 Unit Body 7 Suction Port 9 Outlet 11 Nose 13 Heat Exchanger 15 Cross Flow Fan 23 Fan Blade 25 Front End 29 Output Device 35 Fan Blade Position Detecting Device 41 Processing Device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Koido 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Inside Toshiba Living Space Systems Technology Research Institute (72) Inventor Takeshi Mishima Shin-Sugita-cho, Isogo-ku, Yokohama, Kanagawa No. 8 Institution of Toshiba Living Space Systems Technology Co., Ltd. (72) Inventor Ai Kurai No. 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture

Claims (6)

[Claims] 1. A heat exchanger, a rotatable cross-flow fan having fan blades provided at predetermined intervals in a unit body having a suction port and a blow-out port, and between the suction port and the blow-out port. In an indoor unit provided with a nose portion extended from the unit body toward the cross flow fan side, a fan blade position detection device for detecting a fan blade of the cross flow fan and a detection signal from the fan blade position detection device are processed. And an output device for moving the front end portion of the nose portion forward and backward with respect to the cross flow fan based on a signal from the processing device. Construction. 2. An output device for advancing / retracting the front end portion of the nose portion with respect to the cross flow fan is provided at least in the nose portion main body of the nose portion.
The indoor unit structure of the described air conditioner. 3. The indoor unit structure for an air conditioner according to claim 1, wherein the processing device for processing the detection signal from the fan blade position detection device includes a delay element. 4. The fan blade position detection device is an optical sensor including a light emitting unit that emits light to the fan blade and a light receiving unit that receives light that has hit the fan blade. Indoor unit structure of the air conditioner. 5. The indoor unit structure for an air conditioner according to claim 1, wherein the fan blade position detection device is a microphone that detects a pressure fluctuation generated at a front end portion of the nose portion. 6. A heat exchanger, a rotatable cross-flow fan having fan blades provided at predetermined intervals in a unit main body having a suction port and a blowout port, and between the suction port and the blowout port, In an indoor unit provided with a nose portion extended from the unit body toward the cross flow fan side, a fan blade position detection device for detecting a fan blade of the cross flow fan and a detection signal from the fan blade position detection device are processed. And an output device for generating, based on a signal from the processing device, an interference wave having a phase opposite to the pressure fluctuation generated at the front end of the nose portion. Knit structure.