JP5046295B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus including a switch for instructing ignition and extinguishing of a gas burner.

  Conventionally, for example, a gas fan heater has been provided with a momentary operation switch for instructing ignition and extinguishing of a burner. When the operation switch is operated during combustion of the burner, a fire extinguishing process of the burner is performed. I am trying to do it.

  When the user operates the operation switch to extinguish the burner, the operation switch is temporarily in a non-input state (for example, a switch contact point) depending on the operation mode (change in the pressing force with respect to the operation switch due to hand tremors). May be switched to the input state again after returning from the non-input state to the input state (for example, the ON state in which the switch contact is closed).

  In this case, the burner is extinguished when the operation switch is switched from the non-input state to the input state for the first time, but when the operation switch is switched from the non-input state to the input state, On the other hand, the burner is reignited.

Here, FIGS. 5A to 5C are timing charts showing the burner state (combustion state / extinguishing state) in the upper stage and the operation switch state (ON state / OFF state) in the lower stage. is there. Then, in order to address the above disadvantages, as shown in FIG. 5 (a), when the operating switch t ₅₀ in the burner combustion is switched from the OFF state to the ON state from the time t ₅₀ which changed該切as rejection period between (t ₅₀ ~t ₅₄₎ until a predetermined time T _b has elapsed, a configuration which is adapted to prohibit the acceptance of the operation switch has been proposed (e.g., see Patent Document 1).

According to this configuration, since the operation switch at t ₅₂ within a predetermined time period T _b is the ignition process of the burner is not executed even if switched from the OFF state to the ON state, the operation time of the operation switch is short (t ₅₀ ~t ₅₁ ) For the user, it is possible to prevent the burner from being re-ignited against the intention of the user by switching the operation switch between the OFF state and the ON state within the reception prohibition period.
JP 2005-83594 A

The operation mode of the operation switch by the user is various, and some users press the operation switch for a long time when instructing ignition of the burner. When the user presses the operation switch for a long time as described above, as shown in FIG. 5B, the user ends the operation of the operation switch, and the operation switch is changed from the ON state to the OFF state. T ₂₂ from t ₆₁ to t _{63 after} switching is a substantial reception prohibition period. Therefore, it becomes shorter than the substantial reception prohibition period T ₂₁ in FIG.

When the operation of the operation switch by the user is longer, as shown in FIG. 5C, the user ends the operation of the operation switch and the operation switch is switched from the ON state to the OFF state. T ₂₃ from ₇₁ to t ₇₂ is a substantial rejection period is further shortened substantial rejection period.

In this case, t ₇₃ next operation switch is switched from the OFF state to the ON state is out of acceptance inhibition period T _b. In this case, for example, when the user loosens the force pushing the operation switch for a moment, or when the user touches the operation switch unconsciously with a finger once released from the operation switch, the operation switch is in the OFF state. The burner will be re-ignited when switched from ON to OFF.

  Therefore, an object of the present invention is to provide a combustion apparatus that can more reliably prevent reignition of the burner against the intention of the user when an instruction to extinguish the burner is given.

  The present invention has been made in order to achieve the above object, and includes a burner, a momentary type switch for instructing ignition and extinguishing of the burner, and ignition processing of the burner according to an input state of the switch. The present invention relates to a combustion apparatus including a combustion control unit that performs a fire extinguishing process.

The combustion control means executes the fire extinguishing process of the burner when the operation switch is switched from the non-input state to the input state during combustion of the burner, and then the operation switch is first switched from the input state. The period from the time when switching to the non-input state until a predetermined time elapses is set as a reception prohibition period, and when the operation switch is switched from the non-input state to the input state within the reception prohibition period, When the operation switch is switched from the non-input state to the input state with the burner extinguished, the burner ignition processing is executed and the acceptance prohibition period is set. Instead, when the operation switch is switched from the non-input state to the input state for the first time, the fire extinguishing process of the burner is executed .

  According to the present invention, the operation control means extinguishes the burner when the switch is switched from the non-input state to the input state during combustion of the burner, and then the operation switch is moved from the input state. The period from when switching to the non-input state until a predetermined time elapses is set as the reception prohibition period.

  In this case, the reception prohibition period starts from the time when the user completes the operation of the operation switch and the operation switch is switched from the input state to the non-input state. For this reason, even when the user operates the operation switch for a long time, the operation switch is not allowed to be accepted until the acceptance prohibition period elapses after the operation is completed. According to the aspect, it is possible to more reliably prevent the burner from being reignited.

Further, according to the present invention, when the user operates the switch to ignite the burner, the setting of the acceptance prohibition period by the combustion control means is not performed. Therefore, when the user operates the operation switch, the burner is quickly extinguished by the combustion control means, and the timing of extinguishing is not delayed.

  The switch is provided by being biased toward the first position by a hinge, and moves from the first position to the second position by a pressing operation by a user. Oppositely provided directly on the circuit board, in the process of moving the key top from the first position to the second position, the non-input state is changed to the input state by the pressing force transmitted from the key top. And a tact switch that switches from an input state to a non-input state due to a decrease in the pressing pressure when the key top moves from the second position to the first position. .

  In the present invention, the tact switch constituting the switch is directly attached to the circuit board. Therefore, when the user presses the key top of the switch, the pressing force is transmitted to the tact switch, and the circuit board is bent when the tact switch is switched from the non-input state to the input state. Arise. If the deflection is large, the details will be described later. In the process in which the user removes the finger from the key top and the deflection of the circuit board decreases, the tact switch instantaneously switches between the input state and the non-input state. It may occur that the switch is made multiple times between.

  Therefore, when the burner extinguishing process is executed by the combustion control means, a period from when the switch is first switched from the input state to the non-input state until a predetermined time elapses is set as the reception prohibition period. By setting, when the switching between the input state and the non-input state of the tact switch due to such bending of the circuit board occurs, the burner is re-ignited against the intention of the user. Can be prevented.

  Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a control block diagram of a gas fan heater which is a combustion apparatus according to the present invention. The gas fan heater includes a controller 10 for controlling the overall operation of the gas fan heater and an operation provided on the upper surface of the gas fan heater. A panel 20, a thermocouple 12 for detecting the combustion state of a burner (not shown), an igniter 13 for applying a high voltage to the ignition electrode of the burner to generate a spark discharge, and a gas supply pipe for supplying fuel gas to the burner A solenoid valve 14 that opens and closes (not shown), a proportional valve 15 that adjusts the opening of the gas supply pipe, a combustion air is supplied to the burner, and the air heated by the burner is used as a warm air outlet. A fan 16 that is sent out indoors (not shown) and a room temperature sensor 17 that detects the room temperature are provided.

  The controller 10 is an electronic unit including a microcomputer, a memory, and the like, and includes an operation control unit 11 that performs a heating operation. The operation panel 20 includes a lock switch 21 for instructing a set / reset in a locked state in which each switch cannot be operated, a lock lamp 22 that is lit when in the locked state, and a room temperature for changing a set room temperature. The DOWN switch 26 and the room temperature UP switch 27, the room temperature display unit 25 for displaying the current room temperature or the set room temperature, the set room temperature lamp 23 that is lit when the set room temperature is displayed on the room temperature display unit 25, and the room temperature display unit 25 The current room temperature lamp 24 that is lit when is displayed, the auto save lamp 28 that is lit during execution of the auto save operation for adjusting the room temperature to be lower than the set room temperature when the room temperature reaches the set room temperature, an air filter (not shown) ) A filter lamp 29 for informing about dust clogging, a combustion lamp 30 that is lit during combustion of the burner, and And a driving switch 31 for instructing start and stop of the tuft driver (corresponding to momentary operation switch for instructing the ignition and extinguishing of the burner of the present invention).

  When the user operates the lock switch 22, the lock state is set, and the lock state is released when the user presses the lock switch 22 for a long time (for example, for 1 second or more) in the lock state.

  The room temperature display unit 25 normally displays the current room temperature, and switches to the set room temperature when the user operates the room temperature DOWN switch 26 or the room temperature UP switch 27. When about 10 seconds elapse after the operation of the room temperature DOWN switch 26 and the room temperature UP switch 27 is finished, the display on the room temperature display unit 25 is switched from the set room temperature to the current room temperature.

  Each switch (the lock switch 21, the room temperature DOWN switch 26, the room temperature UP switch 27, and the operation switch 31) is a momentary type (automatic return type) switch, and is a contact point only while the user is pressing. Becomes ON state (input state), and when the user finishes the pressing operation, the contact returns to OFF state (non-input state). Note that the contact is in the OFF state (input state) only while the user is pressing, and the contact is in the ON state (non-input state) when the user finishes the pressing operation. Also good.

  2 is a longitudinal sectional view of the operation panel 20. Each switch of the operation panel 20 includes a tact switch 60 directly attached to the circuit board 50, and the circuit board 50 is attached to the spacer portion 52 by a screw 52. The key top 62 is attached to the case 51 via a hinge 61. Each switch is urged upward by the hinge 61, and by the pressing operation by the user's finger F, the key top 62 is lowered to contact the tact switch 60, and the tact switch 60 is turned on. At this time, if the pressing pressure by the user's finger F is high, the downward deflection of the circuit board 50 increases.

The steady position where the key top 62 is not operated by the user and the key top 62 is above corresponds to the first position of the present invention. Further, the position where the key top 62 is operated by the user, moves downward and contacts the tact switch 60, and the tact switch 60 is in the ON state corresponds to the second position of the present invention. When the person's finger F is separated from the key top 62, the key top 62 is separated from the tact switch 60 by the urging force of the hinge 61 and returns to the steady position. At this time, if the downward deflection of the circuit board 50 is large, the key top 62 returns to the steady state before the circuit board 50 and is separated from the tact switch 60, and the tact switch 60 is changed from the ON state to the OFF state. Switch to.

  Then, the circuit board 50 is bent upward due to the reaction, and the tact switch 60 contacts the key top 62 and the tact switch 60 is instantaneously switched from the OFF state to the ON state. As a result, the tact switch 60 is turned off.

  As described above, when the tact switch 60 is directly attached to the circuit board 50, when the user lifts his / her finger from the key top 62 due to the influence of the bending of the circuit board 50 when the key top 62 is pressed. In addition, it may occur that the tact switch 60 instantaneously changes from the ON state to the OFF state to the ON state and then to the OFF state.

  Next, with reference to FIG. 3, the process by the operation control means 11 when the user operates the operation switch 31 when the heating operation is being performed and the burner is in the combustion state will be described.

FIG. 3A to FIG. 3C show the burner state (combustion state / fire extinguishing state) on the upper stage and the operation switch 21 state (ON state / OFF state) on the lower stage. Figure 3 (a), the operation control means 11, during combustion of the burner, when the operation switch 31 is operated by the t ₁₀ (when the operation switch 31 is switched from the OFF state to the ON state) The solenoid valve 14 is closed to extinguish the burner.

Then, the operation control means 11 thereafter starts from the time t ₁₁ when the operation switch 31 first returns from the ON state to the OFF state until Ta (corresponding to a predetermined time of the present invention) elapses (t _{11 to} t ₁₄ ) is set as a reception prohibition period during which the operation of the operation switch 31 is not accepted. As a result, when the user operates the operation switch 31 to instruct the stop of the heating operation and the fire extinguishing process of the burner is executed, the operation switch 31 is erroneously touched after returning to the OFF state. , by loosening the pressing force against the operation switch 31 momentarily, when the operation switch 31 at t ₁₂ in the rejection period has Tsu switched from the OFF state to the oN state, the burner is prevented from being re-ignited.

  In addition, referring to FIG. 2, as described above, when the user lifts his / her finger from the operation switch 31, the tact switch 60 constituting the operation switch 31 is instantaneously caused by the influence of the bending of the circuit board 50. Even if the state changes from the ON state to the OFF state to the ON state and then changes to the OFF state, if such a change in the state of the tact switch 60 occurs within the reception prohibition period, the ON state is changed from the second OFF state to the ON state. Switching to is not accepted.

  Therefore, after the burner is extinguished by the first switching from the OFF state to the ON state, the user's intention is to switch from the second OFF state to the ON state due to the bending of the circuit board 50. On the other hand, it is possible to prevent the burner from being ignited again.

Note that when the operation switch 31 at t ₁₅ after rejection period has elapsed is Tsu switched from the OFF state to the ON state, the operation control means 11 starts a heating operation to ignite the burner.

And thus, between the time t ₁₁ the operation switch 31 is Tsu switched from the ON state to the OFF state until the predetermined time Ta elapses (t ₁₁ ~t _14), by a rejection period, FIG. As shown in FIG. 3B and FIG. 3C, even when the user presses the operation switch 31 for a long time and instructs to stop the heating operation, the burner is re-ignited due to the user's erroneous operation. Can be prevented.

FIG. 3B shows a force for pressing the operation switch 31 at t ₂₁ and t ₂₃ after the user starts the operation of the operation switch 31 at t ₂₀ (the operation switch 31 switches from the OFF state to the ON state). This shows the case where is loosened for a moment. operation switch 31 at t ₂₁ ~t ₂₂ and t ₂₃ ~t ₂₄ is after the switched momentarily OFF state from the ON state, the operation switch 31 is restored to the ON state.

In this case, t ₂₂ and t ₂₄ operation switch 31 is Tsu switched from the OFF state to the ON state, since both the acceptance prohibition period (t ₂₁ ~t _25), operation control means 11 does not start the heating operation The burner ignition process is not executed.

Next, FIG.3 (c) has shown the case where the operation time of the operation switch 31 by a user is short. Immediately after the user in t ₃₀ ~t ₃₁ has operated the operation switch 31, for example incorrectly shows the case where had touched the operation switch 31 at t ₃₂ ~t ₃₃ and from t ₃₁ the predetermined time T _a is elapsed (T _{31 to} t ₃₄ ) is set as the reception prohibition period.

In this case, since t ₃₂ when the operation switch 31 is switched from the OFF state to the ON state due to an erroneous operation is within the reception prohibition period (t _{31 to} t ₃₄ ), the operation control means 11 does not start the heating operation, and the burner The ignition process is not executed. Note that when the operation switch 31 at t ₃₅ after a lapse of reception prohibition period (t ₃₁ ~t ₃₄₎ is has Tsu switched from the OFF state to the ON state, the operation control means 11 is ignited process of the burner to start the heating operation Execute.

  Next, with reference to FIG. 4, the process by the operation control means 11 when the user operates the operation switch 31 when the heating operation is stopped and the burner is in the fire extinguishing state will be described.

FIG. 4 shows the state of the burner (combustion state / extinguishing state) in the upper stage, and the state of the operation switch 31 (ON state / OFF state) in the lower stage, as in FIGS. 3 (a) to 3 (c). It is a thing. Operation control means 11, when the operation switch 31 is operated at t ₄₀ (when the operation switch 31 is Tsu switched from the OFF state to the ON state), and starts the heating operation by executing the ignition process of the burner.

In this case, unlike FIG. 3 (a) ~ FIG 3 (c), the operation control means 11, when the operation switch 31 at t ₄₁ has Tsu switched from the ON state to the OFF state, the acceptance prohibition period Not set. Therefore, when the user has operated the operation switch 31 at t _42, the operation control means 11 stops the heating operation immediately extinguish the burner. Thereby, it is possible to prevent the user from feeling uncomfortable or uneasy because the heating operation is continued and the fire extinguishing process of the burner is not performed even though the user performs the heating operation stop operation.

  In the present embodiment, the gas fan heater is shown as the combustion apparatus of the present invention. However, any combustion apparatus having a burner such as a gas stove and a switch for instructing ignition / extinguishing of the burner may be used. Applicable.

The control block diagram of a gas fan heater. The longitudinal cross-sectional view of the switch with which the operation panel was attached. The timing chart when an operation switch is operated when a burner is in a combustion state. The timing chart when the operation switch is operated when the burner is in a fire extinguishing state. In the conventional gas fan heater, a timing chart when the operation switch is operated when the burner is in a combustion state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Controller, 11 ... Operation control means, 20 ... Operation panel, 31 ... Operation switch, 50 ... Circuit board, 51 ... Case (of operation panel), 60 ... Tact switch, 61 ... Hinge, 62 ... Key top

Claims (2)

Combustion comprising a burner, a momentary type operation switch for instructing ignition and extinguishing of the burner, and combustion control means for executing ignition processing and extinguishing processing of the burner according to the input state of the operation switch In the device
The combustion control means includes
When the operation switch is switched from the non-input state to the input state during combustion of the burner, the fire extinguishing process of the burner is executed, and then the operation switch is first switched from the input state to the non-input state. Is set as a reception prohibition period until a predetermined time elapses, and when the operation switch is switched from the non-input state to the input state within the reception prohibition period, the ignition process of the burner is not performed ,
Further, when the operation switch is switched from the non-input state to the input state with the burner extinguished, the burner is ignited, and without setting the acceptance prohibition period, A combustion apparatus , wherein when the operation switch is switched from a non-input state to an input state, the burner is extinguished . The operation switch is provided by being biased toward the first position by a hinge, and moves from the first position to the second position by a pressing operation by a user, and faces the key top. In the process of moving the key top from the first position to the second position, the non-input state is changed to the input state by the pressing force transmitted from the key top. And a tact switch that switches from an input state to a non-input state due to a decrease in the pressing force in the process of switching the key top from the second position to the first position. The combustion apparatus according to claim 1.

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