JP3635931B2 - Liquid fuel vaporization combustion system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid fuel vaporization type combustion apparatus that mixes and vaporizes vaporized liquid fuel with supplied air. This combustion apparatus is used for, for example, a hot water supply apparatus.
[0002]
[Prior art]
In a hot water supply apparatus equipped with a conventional liquid fuel vaporization type combustion apparatus, for example, when an operation switch is turned on, a standby operation is performed instead of a combustion operation, and a hot water supply request is received by opening a currant or the like. Sometimes the combustion operation is started.
[0003]
The above-described standby operation refers to heating the vaporizer that vaporizes the liquid fuel to a required temperature and applying vaporization preheating so that the combustion operation can be performed immediately.
[0004]
Conventionally, the vaporization preheating temperature during the standby operation and the vaporization temperature during the combustion operation are fixed to required values that are uniquely determined by experiments or the like.
[0005]
[Problems to be solved by the invention]
In the above-described conventional example, when the environmental temperature is low, such as in winter, when the combustion operation is started, the liquid fuel once vaporized in the carburetor may re-liquefy and emit white smoke. .
[0006]
Although this phenomenon is not a problem for the device itself, it may fall into the sense that an abnormal situation has occurred for the user, and complains to the device manufacturer that the device has failed. Sometimes it does.
[0007]
In consideration of the above circumstances, if the temperature of the vaporizer is set higher than the above-mentioned fixed value, the temperature is excessively high in use in summer or in a warm area, so that electricity consumption is wasted. There is a concern that it will increase.
[0008]
Accordingly, an object of the present invention is to prevent the occurrence of a phenomenon in a liquid fuel vaporization type combustion apparatus in which the vaporized liquid fuel is reliquefied and emits white smoke or the like even under a low environmental temperature condition such as winter.
[0009]
[Means for Solving the Problems]
In the present invention, especially in environmental temperature is low conditions such as winter, so as to generate the required specification signal, depending on to respond to this designation signal, the vaporization preheating temperature during standby operation before combustion operation, steady Is set higher. In addition, the combustion temperature during the combustion operation may be set higher than that during the steady state.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings. In this embodiment, an example in which the liquid fuel vaporization type combustion apparatus of the present invention is used for a hot water supply apparatus will be given. However, the apparatus in which the liquid fuel vaporization combustion apparatus of the present invention is used is not limited to a hot water supply apparatus.
[0011]
1 to 4 relate to Embodiment 1 of the present invention, FIG. 1 is a configuration diagram showing a hot water supply device, FIG. 2 is a configuration diagram of a liquid fuel vaporization combustion device in FIG. 1, and FIG. FIG. 4 is a control flow diagram for explaining the operation.
[0012]
In the figure, A shows the entire liquid fuel vaporization type combustion apparatus. This combustion apparatus A includes a heat exchange can body 10, a vaporizer 20, a burner 30, a fuel supply means 40, a blower 50, and a damper 60. It is the composition provided with. A hot water supply circuit 70, a bath cooking circuit 80, and a controller 90 are attached to the combustion apparatus A, thereby forming a hot water supply apparatus.
[0013]
In the heat exchange can body 10, heat exchange pipes 72 and 82 of the hot water supply circuit 70 and the bath cooking circuit 80 are penetrated, and the vaporizer 20 and the burner 30 are arranged below the heat exchange can body 10. Has been.
[0014]
The vaporizer 20 vaporizes liquid fuel such as kerosene supplied from the fuel supply means 40. The diffusion vane 21, vaporizer heater 22, vaporizer temperature sensor 23, vaporization wall surface 24, mixing chamber 25, and mixing chamber heater 26 are used. , A motor 27, an air supply temperature sensor 28, a motor rotation speed sensor 29, and the like. In the vaporizer 20, the supplied liquid fuel is scattered on the vaporization wall surface 24 by rotating the diffusion blade 21 by the motor 27, and vaporized by the heat in the vaporization heater 22 and the mixing chamber heater 26. It has become. The supply air temperature sensor 28 detects the temperature of the air taken in to send to the vaporizer 20 and the burner 30, and is composed of a thermistor or the like.
[0015]
The burner 30 ignites and burns vaporized fuel supplied from the vaporizer 20 and air supplied from the blower 50, and includes an igniter 31 and a flame detector 32.
[0016]
The combustion supply means 40 supplies kerosene from a kerosene tank (not shown) to the vaporizer 20, and includes a pumping pump 41, a sub tank 42, a constant flow pump 43, and the like.
[0017]
The blower 50 supplies air to the vaporizer 20 and the burner 30, and includes a blower fan 51, a drive motor 52, a rotation speed sensor 53, and the like.
[0018]
The damper 60 is provided in the middle of the ventilation path which connects the vaporizer 20 and the air blower 50, and controls the opening degree of this ventilation path. The damper 60 is displaced in two states by a driving means such as an electric motor (not shown), a position for closing the ventilation path (see the solid line in FIG. 2) and a position for opening the ventilation path (see the broken line in FIG. 2). The damper 60 here is in a state that allows the required ventilation without completely closing the ventilation path at the closed position.
[0019]
In the combustion apparatus A having such components 10 to 60, liquid fuel such as kerosene supplied from the fuel supply means 40 is vaporized by the carburetor 20, and this vaporized fuel and the air supplied from the blower 50 are in a required ratio. Are mixed and sent to the burner 30 for combustion. With this combustion heat, water passing through the heat exchange pipes 72 and 82 of the hot water supply circuit 70 and the bath cooking circuit 80 in the heat exchange can 10 is heated. The air supplied from the blower 50 and passed through the damper 60 is not only sent to the carburetor 20 side as primary air but also directly supplied to the burner 30 as secondary air, and a part of the secondary air is ineffective air. And passes through the heat exchange can 10.
[0020]
The hot water supply circuit 70 has a bypass mixing structure in which, for example, tap water or the like is mixed with hot water heated by the combustion apparatus A and a part of tap water and discharged from a hot water supply curan (see broken line). The hot water supply circuit 70 includes a water inlet pipe 71, a heat exchange pipe 72, a hot water outlet pipe 73, a bypass pipe 74, a hot water supply pipe 75, an incoming water flow rate sensor 76, an incoming water temperature sensor 77, an outgoing hot water temperature sensor 78, and a hot water supply temperature sensor. 79 and the like. The hot water supply pipe 75 is branched into a general hot water supply pipe 75a and a bath dropping hot water supply pipe 75b on the way.
[0021]
The bath cooking circuit 80 takes out the bathtub water of a bathtub (not shown), heats it to the required temperature with the combustion device A, and returns it to the bathtub. The hot water supply circuit 70 can mix hot water at the required temperature. It has become. This bath cooking circuit 80 includes a bath return line 81, a heat exchange line 82, a bath outlet line 83, a bypass line 84, a circulation pump 85, a water flow switch 86, and the like.
[0022]
As shown in FIG. 3, the controller 90 includes a controller main body 90a and a remote controller 90b, and executes at least the hot water supply operation shown in FIG. The remote controller 90b is provided with at least an operation switch 90c and an operation condition change switch 90d, such as a green operation lamp 90e.
[0023]
In the above-described hot water supply operation, for example, when the hot water supply curan is opened and the water flow rate sensor 76 detects a minimum operating water amount MOQ or more, the required amount of combustion is changed to the amount of combustion heat by FF (feed forward) control. By opening and closing the damper 60, the air volume of the blower 50 (the number of rotations by the blower fan 51), and the constant flow pump 43 so that the actual amount of combustion heat approaches the required amount of combustion heat by adding the amount of combustion heat by FB (feedback) control. Control the fuel supply amount.
[0024]
Next, the operation related to the hot water supply operation will be described in detail with reference to FIG. 4 as a reference example .
[0025]
That is, when the operation switch 90c is turned on, the control flow of FIG. 4 is started in step n1, and the vaporizer 20 is heated to a required temperature by applying standby operation in steps n2 to n7, thereby providing vaporization preheating. Keep it in a state to
[0026]
In this standby operation, the vaporization heater 22 is driven in step n2, and it is determined in step n3 whether or not the temperature detected by the vaporizer temperature sensor 23 has reached a required set temperature, for example, 200 ° C. or higher. Here, when the temperature is lower than the set temperature, the operation lamp 90e is blinked at step n4 to notify that the request for hot water supply cannot be accepted, while waiting for the temperature to become higher than the set temperature. The operation lamp 90e is continuously turned on to notify that the hot water supply request can be accepted.
[0027]
Then, it waits to receive a hot water supply request in step n6. This hot water supply request means when the hot water supply curan is opened or the like and the incoming water flow rate sensor 76 detects a minimum operating water amount MOQ or more.
[0028]
If there is no hot water supply request, the vaporization heater 22 is controlled to maintain a required set temperature, for example, 210 ° C. based on the temperature detected by the vaporizer temperature sensor 23 in step n7, and the process returns to step n6.
[0029]
On the other hand, if there is a hot water supply request, it is determined in step n8 whether or not the operating condition change switch 90d is on. If the operating condition change switch 90d is off, a steady-state combustion operation is performed in step n9, and if it is on, a high-temperature combustion operation is performed in step n10. In any of the conditions, in the combustion operation, the burner 30, the blower 50, and the damper 60 are controlled to burn the mixed fuel in which vaporized fuel and air are mixed. However, in the combustion operation under the steady condition in step n9, the vaporization is performed. The vaporizing heater 22 is controlled so that the heating temperature of the vaporizer 20 is set to a required set temperature, for example, 235 ° C., and in the combustion operation under the high temperature condition in the above step n10, the heating temperature of the vaporizer 20 is set to the required set temperature, for example The vaporizing heater 22 is controlled so as to be higher than that at the normal time.
[0030]
As described above, in the first embodiment, when the operation condition change switch 90d is in the OFF state, the combustion operation is performed under the steady condition. However, when the operation condition change switch 90d is in the ON state, the heating temperature of the vaporizer 20 is set higher than the steady condition. The combustion operation is performed under a high temperature condition set high. Therefore, for example, in the winter season, if the operation condition change switch 90d is turned on, the liquid fuel once vaporized in the vaporizer 20 during the combustion operation is re-liquefied in the mixing chamber 25 and white smoke is released. Occurrence can be prevented.
[0031]
FIG. 5 is a control flowchart for explaining operations according to the second embodiment of the present invention. In short, in the second embodiment, when the operating condition change switch 90d is turned on, the vaporizing heater 22 is controlled under a high temperature condition both during the standby operation and during the combustion operation.
[0032]
That is, when the operation switch 90c is turned on, the control flow of FIG. 5 is started in step n31, the vaporization heater 22 is driven in step n32, and the standby operation is executed in steps n33 to n37 and n41 to n44. Thus, the vaporizer 20 is heated to a required set temperature and held in a state in which vaporization preheating is applied.
[0033]
In the case of the second embodiment, first, in step n33, it is determined whether or not the operating condition change switch 90d is on. Here, if the operation condition change switch 90d is off, the standby operation and combustion operation of the steady condition are executed in steps n34 to n39, and if it is on, the standby operation and combustion operation of the high temperature condition are executed in steps n40 to n45. .
[0034]
In any of the standby operations under any conditions, it is determined in steps n34 and n40 whether or not the temperature detected by the vaporizer temperature sensor 23 has become equal to or higher than a required set temperature. Here, when the temperature is lower than the set temperature, the operation lamp 90e is blinked at steps n35 and n41 to notify that the hot water supply request cannot be accepted and wait for the set temperature to be exceeded. In steps n36 and n42, the operation lamp 90e is continuously turned on to notify that the hot water supply request can be accepted. However, the set temperature in the steady condition in step n34 is set to 200 ° C., for example, and the set temperature in the high temperature condition in step n40 is set to 210 ° C. and higher than that in the steady state.
[0035]
Thereafter, it waits for a hot water supply request in steps n37 and n43. The hot water supply request here refers to a time when the hot water supply curan is opened or the like and the incoming water flow rate sensor 76 detects a minimum operating water amount MOQ or more.
[0036]
If there is no hot water supply request, the vaporization heater 22 is controlled so as to maintain the required set temperature based on the temperature detected by the vaporizer temperature sensor 23 in steps n38 and n44, and the process returns to the above steps n37 and n43. Note that the set temperature in step n38 is set to 210 ° C., for example, and the set temperature in step n44 is set to 220 ° C. and set higher than in the steady state.
[0037]
On the other hand, when there is a hot water supply request, in step n39 and n45, the burner 30, the blower 50 and the damper 60 are controlled to burn the mixed fuel obtained by mixing the vaporized fuel and the air, and based on the detected temperature of the vaporizer temperature sensor 23. The vaporizing heater 22 is controlled so as to maintain a required set temperature. However, the set temperature in the steady condition of step n39 is set to, for example, 235 ° C., and the set temperature in the high temperature condition of step n45 is set to, for example, 250 ° C. higher than that in the steady state.
[0038]
As described above, in the second embodiment, for example, in winter, if the operation condition change switch 90d is turned on, the liquid fuel once vaporized in the vaporizer 20 during the combustion operation is re-liquefied in the mixing chamber 25. Occurrence of the phenomenon in which white smoke is emitted can be prevented more effectively than in the first embodiment.
[0039]
In particular, in the second embodiment, the high temperature condition and the steady condition can be selectively executed for the standby operation, and the vaporization temperature at the time when the operation lamp 90e is continuously lit in the standby operation under the high temperature condition is set to the steady state. Therefore, even if the hot water supply request is received immediately after the operation lamp 90e is continuously turned on and the combustion operation is performed under the high temperature condition in Step n45, the liquid fuel once vaporized is mixed in the mixing chamber 25. It becomes possible to prevent the phenomenon that white smoke is released due to re-liquefaction.
[0040]
However, it can be said that the energy required for the standby operation can be reduced when the vaporizing heater 22 is not controlled under high temperature conditions during the standby operation as in the first embodiment.
[0041]
In addition, this invention is not limited only to the said embodiment, A various application and deformation | transformation can be considered.
[0042]
(1) In each of the above embodiments, an example is given in which the operating condition change switch 90d is provided in the remote controller 90b. However, the switch 90d is concealed inside the housing of the water heater so that the user cannot operate it. Can be installed. In addition, it is possible to input a specific code that is not notified to the user from the remote controller 90d, or to input by a simultaneous operation of a plurality of switches. In this way, it is possible to avoid the user's mischievous operation, and it becomes possible to operate only when the maintenance manager receives a notification from the user, and it is possible to avoid the occurrence of malfunction due to easy operation condition change. Become.
[0043]
(2) In the second embodiment, the vaporization heater 22 is controlled under a high temperature condition both during the standby operation and during the combustion operation. In the second embodiment, the vaporization heater 22 is controlled only under the high temperature condition during the standby operation. Thus, the vaporizing heater 22 may be controlled under steady conditions during the combustion operation.
[0044]
(3) In the second embodiment, the set temperature in steps n38 and n44 may be unified to 210 ° C., for example.
[0045]
(4) In each of the above embodiments, an example is given in which a person gives an instruction to change the operating condition. For example, an environmental temperature sensor is installed, and the operating condition is changed based on the sensor detection output. May be.
[0046]
【The invention's effect】
According to the first to sixth aspects of the present invention, the phenomenon that the liquid fuel once vaporized during the combustion operation is re-liquefied and white smoke is emitted even when the environmental temperature is lowered, such as in winter, is caused. Can be prevented.
[0048]
According to the third and fourth aspects of the invention, the combustion temperature in the combustion operation and the vaporization preheating temperature during standby of the combustion operation are set higher than in the steady state, particularly when the environmental temperature is lowered, such as in winter. Therefore, it is possible to more effectively prevent the phenomenon that the liquid fuel once vaporized during the combustion operation is re-liquefied and white smoke is emitted compared to the inventions of claims 1 and 2. .
[0049]
Further, in the invention of claim 5 , when the designation signal is inputted, the vaporization preheating temperature at the time when the combustion request can be accepted in the standby processing process can be made higher than that at the normal time. Even when a combustion request is received immediately after the vaporization, it is possible to prevent a phenomenon in which the liquid fuel once vaporized is reliquefied and white smoke is emitted.
[0050]
Furthermore, in the invention of claim 6 , since the white smoke generation prevention measure described above can be performed only when the user or the maintenance manager feels it is necessary to operate, avoiding malfunction due to easy operation condition change. become able to.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of a hot water supply apparatus equipped with a combustion apparatus of the present invention. FIG. 2 is a block diagram showing a combustion apparatus in FIG. 1. FIG. 3 is a block diagram of a controller of the first embodiment. FIG. 5 is a control flow diagram for explaining the operation of the hot water supply apparatus of the first embodiment. FIG. 5 is a control flow chart corresponding to FIG. 4 in the second embodiment of the hot water supply apparatus equipped with the combustion apparatus of the present invention.
A Combustion device 10 Heat exchange can body 20 Vaporizer 22 Vaporizer heater 23 Vaporizer temperature sensor 30 Burner 40 Fuel supply means 50 Blower 60 Damper 90 Controller 90a Controller body 90b Remote controller 90c Operation switch 90d Operation condition change switch

Claims (6)

In a liquid fuel vaporization type combustion apparatus in which vaporized liquid fuel is mixed with air supplied and burned,
A liquid fuel vaporization type combustion apparatus, characterized in that, in response to a required designation signal, a vaporization preheating temperature at the time of standby for combustion operation is set higher than that at a steady state. Vaporization means for vaporizing the liquid fuel, supply means for supplying air to be mixed with the vaporized liquid fuel, combustion means for burning the mixture of vaporized liquid fuel and air, and heating means for heating the vaporization means And a management means for heating the vaporization means to a required temperature in response to the combustion preparation request and applying vaporization preheating and a management means for executing the combustion operation in response to the combustion request,
The liquid fuel vaporization type combustion apparatus, wherein the management means sets a vaporization preheating temperature during standby operation higher than that during steady operation in response to a required designation signal. In a liquid fuel vaporization type combustion apparatus in which vaporized liquid fuel is mixed with air supplied and burned,
A liquid fuel vaporization type combustion apparatus, characterized in that, in response to a required designation signal, a vaporization preheating temperature at the time of standby for combustion operation and a combustion temperature at the time of combustion operation are set to be higher than those at normal time. Vaporization means for vaporizing the liquid fuel, supply means for supplying air to be mixed with the vaporized liquid fuel, combustion means for burning the mixture of vaporized liquid fuel and air, and heating means for heating the vaporization means And a management means for heating the vaporization means to a required temperature in response to the combustion preparation request and applying vaporization preheating and a management means for executing the combustion operation in response to the combustion request,
The liquid fuel vaporization type combustion apparatus, wherein the management means sets a vaporization preheating temperature during standby operation and a vaporization temperature during combustion operation to be higher than those during normal operation in response to a required designation signal. 5. The liquid fuel vaporization type combustion apparatus according to claim 1, wherein the standby operation in which vaporization preheating is applied at the front stage of the combustion operation is performed at a temperature higher than the target vaporization preheating temperature in the process of raising the temperature to the target vaporization preheating temperature. In a state in which the target vaporization preheating temperature is maintained until a combustion request can be accepted when a low required reference temperature is reached, and thereafter a hot water supply request is received. 5. A liquid fuel vaporization type combustion apparatus characterized in that, when a designation signal is input, the reference temperature is set higher than that in a steady state in addition to the processing in the first to fourth aspects. In any of the liquid fuel vaporizing type combustion apparatus of claims 1 to 5, and an operation means for generating the required designation signal when operated by a human, the liquid fuel vaporizing type combustion apparatus, characterized in that .

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