JPH0473510A - Burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) This invention relates to a combustor that heats a load with the combustion flame of a burner.

(Prior Art) Generally, a combustion machine supplies fuel and combustion air to a burner, ignites the burner, and heats a load with the combustion flame.

In such a combustion machine, when combustion air is supplied to the burner, noise is generated due to the rotation of the combustion fan and ventilation. Furthermore, when the air after combustion is discharged to the outside, noise is generated due to ventilation.

These sounds become noise and cause discomfort to residents.

Therefore, it is conceivable to provide an acoustic muffler in the intake system or exhaust system of the combustion machine.

This acoustic silencing device takes advantage of the property that when sounds with opposite phases collide with each other, they cancel each other out and disappear.It captures the noise, analyzes its frequency, and generates sound waves for silencing that are in opposite phase with the noise and have the same sound pressure. generated and adds to the noise.

(Problem to be Solved by the Invention) However, the above-mentioned acoustic silencer requires a microphone as a means for detecting noise, and is therefore expensive. For this reason, there is a drawback that the cost of the combustion machine increases.

In addition, since the above-mentioned acoustic silencing device creates silencing sound waves after detecting and calculating the noise, it is likely that there will be a time delay before generation occurs, and frequency shifts will occur, which may impair the silencing effect. It may happen.

This invention was developed in consideration of the above-mentioned circumstances, and its purpose is to always provide a good signal without increasing costs and without causing a time delay or frequency shift in the generation of sound waves for silencing noise. An object of the present invention is to provide a combustion machine that can obtain a noise reduction effect.

[Structure of the Invention] (Means for Solving the Problems) This invention supplies fuel and combustion air to a burner,
In a combustor that heats a load with the combustion flame of the burner, means for generating sound waves for silencing in a mode corresponding to the combustion amount of the burner and the amount of combustion air supplied to the burner; A means for radiating air into at least one of an intake path to the burner and an exhaust path from the burner to the outside.

(Function) The system predicts noise from the amount of combustion in the burner and the amount of combustion air supplied to the burner, creates sound waves for silencing, and emits them to the intake system or exhaust system.

The emitted silencing sound waves are added to the noise, and the two cancel each other out and disappear.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a combustion unit, which consists of a burner 2, a suction chamber 3, and a ventilation passage 4, and a parlor 2 is connected to a gas pipe 5.
to a fuel supply source (not shown). A fuel supply control valve 6 is provided in the middle of the gas pipe 5.

The burner 2 burns gas sent from the gas pipe 5.

The suction chamber 3 sucks air through the suction port 3a through the rotation of the combustion fan 7, and uses it as combustion air through the blowout port 3b.
The air is sent from the air to the ventilation path 4.

The ventilation passage 4 serves to guide combustion air to the burner 2.

The fuel supply control valve 6 is for adjusting the amount of gas passing through the gas pipe 5.

The combustion fan 7 uses a fan motor 7M as a driving source.

On the other hand, 11 is a heat exchange unit, which is the above combustion unit]
This heats the load (for example, water) by taking in the heat of combustion. This combustion unit 1 and heat exchange unit 1
1 constitutes a combustion machine for air conditioning.

The heat exchange unit 11 includes a receiving space 12 that once receives hot air from the combustion flame of the burner 2, a convection space 13 that convects hot air overflowing from the receiving space 2, and a convection space 1 that convects hot air overflowing from the receiving space 2.
It consists of an exhaust pipe 14 for discharging the air flowing out from the exhaust pipe 3 to the outside. An exhaust top 15 is provided at the tip of the exhaust pipe 14.

In the combustion unit], a speaker 21 is provided in the ventilation passage 4 which is the intake passage to the burner 2.

In the heat exchange unit 11, a speaker 22 is provided in an exhaust pipe 14 that is an exhaust path from the burner 2 to the outside.

The control circuit is shown in FIG.

30 is a control section, which includes a comparison/calculation section 31, a combustion amount data storage section 32, an air data storage section 33, a combustion amount setting section 34,
It consists of an air total setting section 35, a comparison/calculation section 36, a silencing sound wave data storage section 37, and a silencing sound wave mote setting section 38.

This control section 30 includes an indoor temperature sensor 41, an operation section 42,
Outside temperature sensor 43, wind speed sensor 44, combustion control section 45
, combustion control section 50, fuel wood,) supply control valve 6, fan motor 7M, intake side sound wave generation section 48, exhaust side sound wave generation section 49
Connect.

The comparison/calculation section 31 has the following functional means (1) to (2).

■When the operation switch of the operation section 42 is turned on, the indoor temperature set by the operation section 42 and the indoor temperature sensor 4
], and sends an operation command to the combustion control unit 45 when the indoor temperature is lower than the set indoor temperature.

■When sending an operation command, calculate the difference between the indoor temperature and the set indoor temperature, read out the combustion amount data corresponding to the obtained temperature difference from the combustion amount data storage section 34, and use the read combustion amount data as the combustion amount. Means for sending to the setting section 34.

(2) Means for reading the air amount data corresponding to the determined temperature difference from the air amount data storage section 35 and sending the read air amount data to the air amount setting section 35 when sending out the operation command.

■When sending an operation command, the read combustion amount data, air amount data, outside air temperature data detected by the outside air temperature sensor 43, and outdoor wind speed data detected by the wind speed sensor 44 are sent to the comparison/calculation section 36. means to do.

The combustion control unit 45 controls the operation of the igniter, flame detector, etc. provided near the burner 2.
When receiving an operation command from the calculation unit 31, the burner 2
control to ignite.

The combustion amount setting section 34 sets the opening degree of the fuel supply control valve 6 based on the combustion amount data from the comparison/calculation section 31.

The air amount setting section 35 sets the speed of the fan motor 7M based on the air amount data from the comparison/calculation section 31.

The comparison/calculation unit 36 reads out a specific sound-muffling sonic pig from the sound-muffling data storage unit 37 based on the combustion amount data and the air amount data from the comparison/calculation unit 31, and
A correction calculation based on the outside air temperature data and wind speed data from the comparison/calculation unit 31 is applied to the read sound-muffling sonic pig, and the corrected sound-muffling data is sent to the sound-muffling sonic motor setting unit 38. .

In this case, the silencing sound wave data to be read is for the combustion unit 1.
These two types of silencing sound wave data correspond to the frequency and sound pressure of the sound generated in the intake system of the heat exchange unit 11, and correspond to the frequency and sound pressure of the sound generated in the exhaust system of the heat exchange unit 11.

That is, the silencing sound wave data recorded in the silencing sound wave data storage section 37 is based on the structure of the combustion unit] and the heat exchange unit 11, the combustion amount of the burner 2, the amount of combustion air supplied to the burner 2, etc. This is frequency/sound pressure data calculated and determined in advance taking into account the frequency and sound pressure of the sound generated in the intake system of the combustion unit 1, and the frequency and sound pressure of the sound generated in the exhaust system of the heat exchange unit 11. Each corresponds to different pressures.

The silencing sonic mode setting section 38 sets the combustion unit based on the two types of silencing sonic data from the comparison/calculation section 36.
A sonic mode with the opposite phase and the same sound pressure as the sound generated in the intake system of the heat exchange unit 11 is set, and a sonic wave mode with the opposite phase and the same sound pressure as the sound generated in the exhaust system of the heat exchange unit 11 is set.

The intake side sonic wave generator 48 is configured to have a sound damping sonic mode setting unit 38.
A sound wave signal is created according to the set sound wave mode and is sent to the speaker 21.

The exhaust side sound wave generator 49 is connected to the silencing sound wave mode setting unit 38.
A sound wave signal is created according to the set sound wave mode and is sent to the speaker 22.

In this way, the control section 30 and the sound wave generation section 4849 constitute means for generating sound waves for muffling in a mode corresponding to the combustion amount of the burner 2 and the amount of combustion air supplied to the burner 2. Further, the speakers 21 and 22 constitute means for respectively radiating the generated sound waves for silencing into the intake path to the burner 2 and the exhaust path from the burner 2 to the outside.

Next, the operation in the above configuration will be explained.

When the operating switch of the operating section 42 is turned on, the indoor temperature set by the operating section 42 and the indoor temperature detected by the indoor temperature sensor 41 are compared.

In this comparison, if the indoor temperature is lower than the set indoor temperature, the combustion control section 45 operates and the burner 2 is ignited.

At this time, the opening degree of the fuel supply control valve 6 is controlled based on the difference between the indoor temperature and the set indoor temperature, and the combustion amount of the burner 2 is set. Furthermore, the speed of the fan motor 7M is controlled based on the difference between the indoor temperature and the set indoor temperature, and the combustion fan 7M is controlled.
Set up the suction air foot.

When the burner 2 ignites, the heat exchange unit 1 is heated by its combustion flame, heating the room.

During this operation, noise is generated in the intake system of the combustion unit 1 due to the rotation of the combustion fan 7 and ventilation.

In addition, noise is also generated in the exhaust system of the heat exchange unit 11 due to ventilation.

However, based on the amount of combustion and the amount of combustion air, and taking into account the outside air temperature and outdoor wind speed, we will calculate the silencing sound waves that are in opposite phase to the noise generated in the intake system and the noise that is in opposite phase to the noise generated in the exhaust system. A muffling sound wave is created, which is transmitted to the speaker 21.
It is radiated from 22.

The silencing sound waves emitted from the speaker 21 are added to the noise generated by the rotation of the combustion fan 7 and ventilation, and the two cancel each other out and disappear.

The silencing sound waves emitted from the speaker 22 are transmitted to the exhaust pipe 14
It is added to the noise generated by the ventilation, and the two cancel each other out and disappear.

In this way, since the noise generated in the intake system and the exhaust system is predicted and the silencing sound waves are created, there is no need for conventional means for detecting noise, such as a microphone, and an increase in cost can be avoided.

In addition, since this is so-called feedforward control, which predicts the noise generated in the intake and exhaust systems and creates silencing sound waves, it is no longer the same as the conventional one, which detects noise and calculates it before creating silencing sound waves. In comparison, there is only a time delay until the sound waves for silencing are generated. Therefore, there is no deviation in the frequency of the silencing sound waves, and a good silencing effect can always be obtained.

It should be noted that in the above-mentioned embodiments, a configuration is adopted in which the silencing sound waves are emitted to both the intake system and the exhaust system, or a configuration in which the silencing sound waves are radiated to at least one of them can also be used to obtain a sufficient effect as a noise countermeasure.

[Effects of the Invention] As described above, according to the present invention, in a combustion machine that supplies fuel and combustion air to a burner and heats a load with the combustion flame of the burner, the combustion plate of the burner and the burner are heated. a sound wave generator stage that generates sound waves for silencing in a mode corresponding to the amount of combustion air supplied to the burner; Since it is equipped with a means for emitting radiation to at least one side, it can be used without increasing the cost.
Further, it is possible to provide a combustion machine that can always obtain a good silencing effect without causing a time delay in generating sound waves for silencing noise.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the overall configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a control circuit of the same embodiment. 1 combustion unit, 2... burner, 5 gas pipe, 7...
- Combustion fan, 11... Heat exchange unit, 2]. 22. Speaker, 3o. Control unit. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] In a combustion machine that supplies fuel and combustion air to a burner and heats a load with the combustion flame of the burner, a silencing sound wave of a mode corresponding to the combustion amount of the burner and the amount of combustion air supplied to the burner is used. A combustion machine characterized by comprising: means for generating sound waves, and means for radiating the muffling sound waves to at least one of an intake passage to the burner and an exhaust passage from the burner to the outside.