JPH0552328A - Method of igniting burner - Google Patents

Abstract

PURPOSE:To provide a method of igniting burner capable of performing superior prevention of fading-out phenomenon when the temperature of atmosphere is low without shortening the life of an ignition device or an ignition plug or the like. CONSTITUTION:In the case where the temperature of atmosphere detected by an atmosphere temperature detecting sensor 4 is low, an electrical energization time for an igniting device 2 after detection of ignition detected by an ignition detecting sensor 3 is extended and an ignition continuing time with an ignition plug 1 is extended. In this way, even in the case where the atmosphere temperature is low, a flame is positively set as the burner, and fading-out phenomenon can be well prevented. In addition, in the case where the atmosphere temperature is not low, the ignition continuing time is not extended, so that the life of the igniting device or the igniting plug or the like is not shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner ignition method.

[0002]

2. Description of the Related Art Conventionally, in a burner that burns gas, oil, or the like, when ignition is detected by an ignition detection sensor, ignition is continued for a certain period of time, for example, about 0.3 seconds to prevent extinction. The ignition method was adopted.

[0003]

However, in the conventional burner ignition method, since the ignition duration time after ignition detection is constant, when the ambient temperature is low such as in winter,
There was a problem that the flame was not sufficiently fixed to the burner and the phenomenon of extinguishing could occur. If the ignition duration after ignition detection is set to be long in order to solve this problem, the operating time of the igniter, spark plug, etc. will always be long, regardless of the ambient temperature, so the life of the igniter, spark plug, etc. will be short. Turn into.

It is an object of the present invention to provide a method of igniting a burner capable of favorably preventing the extinguishing phenomenon when the ambient temperature is low without shortening the life of the igniter, spark plug or the like.

[0005]

The present invention is characterized in that the ignition duration time after ignition detection is lengthened when the ambient temperature is low.

[0006]

When the ambient temperature is low, the ignition duration time after ignition detection is lengthened. As a result, the flame is surely fixed on the burner, and the occurrence of the extinguishing phenomenon can be effectively prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is a block diagram of a bath device with a bubble bath function adopting a burner ignition method according to an embodiment of the present invention.
The bathtub water of the bathtub 10 passes from the circulation fitting 11 through the bath return pipe 31, is circulated to the bath heat exchanger 23 by the circulation pump 21, passes through the bath outgoing pipe 32, and returns from the circulation fitting 11 into the bathtub 10. The bath return pipe 31 and the bath outgoing pipe 32 form a circulation path. Further, a bypass passage 33 is provided on the downstream side of the circulation pump 21 so as to bypass the bath heat exchanger 23, and a water amount control valve 27 is provided in the bypass passage 33. The water flow control valve 27 is designed so that the opening degree can be freely adjusted by, for example, an attached servo motor in response to a command from a controller described later.

A water quantity switch 26 is provided on the bath return pipe 31 down to the circulation pump 21 and to the bath heat exchanger 23, and the bath burner 22 is ignited only when the quantity of water passing through the water quantity switch 26 is above a certain level. It is supposed to be done. The bath burner 22 is ignited by the ignition plug 1, and a high voltage is intermittently supplied to the ignition plug 1 from the igniter 2. The ignition of the bath burner 22 is detected by the ignition detection sensor 3. An air introduction pipe 12 which is an air introduction means is connected to the circulation fitting 11. Reference numeral 13 is an air opening / closing valve. More specifically, the air introduction pipe 12 is connected to the negative pressure forming portion of the circulation fitting 11 by the circulating water discharged into the bath 10 so that air is sucked from the negative pressure forming portion and mixed into the discharged circulating water. ing.

Reference numeral 43 is a heat exchanger for hot water supply, 42 is its burner, and 48 is its blower fan. The supplied water enters the hot water supply heat exchanger 43 through the water supply pipe 41, is heated, and is discharged from the hot water supply pipe 44. Water from the water supply pipe 41 or hot water from the hot water supply pipe 44 is sent to the bath return pipe 31 via the drop pipe 50, the drop valve 51, and the three-way switching valve 52 so that water can be supplied to the bathtub 10. .. The hot water outlet pipe 44 is provided with an ambient temperature detection sensor 4 for measuring the temperature around the bath apparatus, and the igniter 2, the ignition detection sensor 3, and the ambient temperature detection sensor 4 are connected to a controller described later. Each burner 22,
Fuel gas is supplied to 42 through a gas pipe 60. Of course, the liquid fuel may be supplied and the burner for the liquid fuel may perform combustion.

Reference numeral 70 denotes a controller, which has a built-in microcomputer and outputs predetermined operation commands to the respective parts of the device in response to information from sensors of the respective parts of the device and commands from a remote controller (not shown).

Next, the operation will be described. FIG. 2 is a flowchart for explaining the ignition operation of the burner 42. At the time of combustion, the controller 70 starts energizing the igniter 2 (step S1). As a result, a high voltage is intermittently supplied from the igniter 2 to the spark plug 1, and the spark of the spark plug 1 ignites the burner 42. On the other hand, the controller 70 determines from the detection signal from the ambient temperature detection sensor 4 whether the ambient temperature is 0 degrees Celsius or higher (step S2), and sets the igniter timer if it is not higher than 0 degrees Celsius (step S3). ). This igniter timer is built in the controller 70 and is realized by hardware or software. Further, the controller 70 determines whether or not 0.3 seconds or more have elapsed since the ignition detection sensor 3 was confirmed to be turned on by the signal from the ignition detection sensor 3 (step S4). That is, when the burner 42 is ignited by the spark of the spark plug 1,
The ignition detection sensor 3 is turned on by the flame, but 0.3 times after the ignition detection sensor 3 is turned on so that the flame is fixed to the burner 42 and burns stably.
Ignition is continued for a second. If it is determined that 0.3 seconds or more have passed since the ignition detection sensor 3 was turned on,
The controller 70 determines whether the igniter timer is 0, that is, whether the time is up (step S5),
If the time has not expired, the igniter timer is decremented by 1 at a predetermined timing (step S6), and the process returns to step S5. If it is determined in step S5 that the igniter timer has timed out, the energization of the igniter 2 is stopped (step S7), and this routine ends. If it is determined in step S4 that 0.3 seconds or more have not elapsed since the ignition detection sensor 3 was turned on, the process returns to step S2. If it is determined in step S2 that the ambient temperature is 0 degrees Celsius or higher, the igniter timer is cleared (step S8), and the process proceeds to step S4.

As described above, when the ambient temperature is less than 0 degrees Celsius, the ignition time is extended by the predetermined time set by the igniter timer, so that the flame is reliably fixed to the burner 42 and the extinguishing phenomenon occurs. It can be prevented well. Moreover, since the ignition time is not extended when the ambient temperature is 0 ° C. or higher, the life of the spark plug 1 and the igniter 2 is not shortened.

Other operations of the bath apparatus with a bubble bath function are as follows. That is, when the bubble bath operation is instructed from a remote controller (not shown),
The controller 70 issues a fully open command to the water amount control valve 27 of the bypass passage 33. On the other hand, when the reheating operation is instructed from the remote controller, the controller 70 keeps the water volume control valve 2 until the water volume switch 26 detects a water volume above a certain level and outputs an ON signal.
7, the operation command is issued in the direction of narrowing the opening degree from the fully opened state.

Now, when the operation switch is turned on by a remote controller (not shown), the controller 70
Determines whether the ON command is an ON command for the additional heating operation or an ON command for the bubble bath operation. In the case of the bubble bath, the circulation pump 21 is turned on and detected by a pressure sensor (not shown) provided in the bath return pipe 31 or the like. On the condition that the water is circulated, a command to fully open the water quantity control valve 27 is issued.

On the other hand, when the controller 70 determines that the on command is additional heating, the controller 70 turns on the circulation pump 21 and operates to squeeze the water amount control valve 27 from the fully opened state on condition that water is circulated. Order. That is, the servomotor of the water quantity control valve 27 is driven to gradually and gradually decrease the opening degree from the fully opened state. During that time, the controller 70 waits for a switch-on signal from the water amount switch 26, and when the water amount switch 26 is turned on, stops narrowing down the water amount control valve 27 and issues an ignition command for the bath burner 22.

When the opening degree of the water quantity control valve 27 is decreased, the water quantity distributed to the heat exchanger 23 side increases, so that the water quantity to the heat exchanger 23 side is increased even if the total water quantity is relatively small. By doing so, reheating can be performed normally. Extremely speaking, if the total amount of water is equal to or more than a certain amount of water required to turn on the water amount switch 26, reheating is possible. Therefore, even if the piping becomes long and the amount of circulating water decreases to some extent, reheating can be performed normally. When it is determined that there is no water circulation, a safe operation is instructed and the operation is stopped.

Although the ambient temperature detecting sensor 4 is installed on the tap pipe 44 in the above embodiment, the ambient temperature detecting sensor 4
May be installed anywhere as long as the temperature around the installation position of the burner 42 can be measured.

In the above embodiment, the ignition method of the present invention is adopted only for the ignition of the hot water supply burner 42. However, the ignition method of the present invention may be adopted for the ignition of the burner 22 for the bath. ..

In the above embodiment, the ignition time is extended when the temperature detected by the ambient temperature detecting sensor 4 is less than 0 degrees Celsius, but the reference temperature for extending the ignition time does not necessarily have to be 0 degrees Celsius. Absent. In addition, a plurality of reference temperatures may be provided and the extension time may be changed in a plurality of stages according to the temperature. Further, the extension time may be increased in an analog manner as the temperature decreases.

[0020]

The present invention has the above-described structure, and since the ignition duration time after ignition detection is lengthened when the ambient temperature is low, the ambient temperature is low without shortening the life of the igniter, spark plug, or the like. It is possible to favorably prevent the occurrence of the disappearance phenomenon.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bath device with a bubble bath function adopting a burner ignition method according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an ignition operation of a bath burner.

[Explanation of symbols]

 1 Spark plug 2 Igniter 3 Ignition detection sensor 4 Ambient temperature detection sensor 42 Burner 44 Hot water pipe

Claims (1)

[Claims] 1. A method of igniting a burner, characterized in that the ignition duration time after ignition detection is lengthened when the ambient temperature is low.