JP2006046891A - Combustion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus capable of solving a capacity shortage phenomenon when a load more than rated capacity is required in hot water supply, bath and heating apparatus. <P>SOLUTION: This combustion apparatus is provided with a hot water supply circuit 18 having a circulation circuit between an outlet and an inlet of a main heat exchanger 16 burned by a burner, a hot water supply and heating indirect heat exchanger 20 performing heat exchange between the hot water supply circuit 18 and a heating circuit 19, and a hot water supply and bath indirect heat exchanger 22 performing heat exchange between the hot water supply circuit 18 and a bath circuit 21. This combustion apparatus is equipped with an ordinary operation mode for operating in predetermined rated capacity of hot water supply, heating, and bath functions, and a special operation mode for operating while exceeding the heating rated capacity when operation exceeding the heating rated capacity is required. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a combustion apparatus having functions of hot water supply, heating, and bath reheating with a single combustion unit.

  Some conventional combustion apparatuses can obtain high thermal efficiency in an operation state in which only a part of the combustion surface is burned by a large hot water heater or the like (see, for example, Patent Document 1). FIG. 7 shows a conventional combustion apparatus described in the publication. As shown in FIG. 7, a burner 4 having a plurality of combustion surfaces 1 to 3, a combustion fan 5 that supplies and discharges the burner 4, a heat absorption pipe 6 that is heated by combustion heat, and a fluid passage path 7 to 7. There are provided a plurality of 9, electromagnetic valves 10 and 11 for opening and closing the passage route, and a route selection portion 12 for selecting a plurality of currency routes for flowing the heating fluid by controlling the electromagnetic valve according to the burner combustion portion. Composed. Therefore, the heat radiation by the ventilation from the combustion fan from the passage path of the non-combustion part is prevented.

The combustion mode of the burner 4 having a plurality of combustion surfaces is, for example, when only the combustion surface (1) is burned when operating at a capacity of up to 4.7, between 4.7 and 8.7 When operating at the capacity of 1, the combustion surface (1) and the combustion surface (2) are combusted, and when operating at the capacity between 8.7 and 13.2, the combustion surface (1) and the combustion surface When (3) is burned and operated between No. 13.2 and No. 16 which is the maximum capacity, all the combustion surfaces are burned.
JP 2004-125266 A

  However, in the conventional combustion apparatus of Patent Document 1 described above, for example, a plurality of passage paths such as hot water supply are provided and the passage path of the combustion section is selected and water is passed, so when the heat absorption pipe of the non-combustion section is completely closed and does not pass water, There was a problem that the heat of the combustion gas that leaked slightly caused boiling due to the temperature rise inside the tube, causing adhesion of scales and the like. Moreover, it is invention of the hot water supply single function apparatus, and the structure in which a passage route forms a circulation circuit was not disclosed.

  Furthermore, conventionally, in a large water heater or the like, the burner turn-down ratio (TDR) that covers from the minimum combustion to the maximum combustion of the appliance cannot be secured, so the burner is divided into a plurality of combustion surfaces, By switching the number of combustion surfaces to be burned and the size of the combustion surfaces, the combination of these can be switched to cover from the minimum combustion to the maximum combustion of the device. It is determined by a preset rated capacity, and cannot be burned beyond the rated capacity. When large capacity is required, it is necessary to select and use a device with a large rated capacity. In that case, there may be various restrictions depending on the size of the rated capacity. There was no hot water heater with the capability.

  Therefore, when using in such a way that it is frequently used at multiple locations during hot water supply operation, it is possible to install multiple hot water heaters and use each water heater properly according to the application. There was a heavy burden in terms of installation location, piping work, and costs.

  Further, when the heating operation is started in a state where the room is completely cooled during the heating operation, it takes a long time until the room temperature rises, and it cannot be heated immediately.

  The present invention solves the above-described conventional problems, and has a one-can three-water function for supplying heat to a heating circuit and a bath circuit using a hot water supply circuit in which a circulation circuit is formed using a heat exchanger for hot water supply. An object of the present invention is to provide a combustion apparatus that can combust a burner that has a rated capacity predetermined for each function and exceeds the rated capacity under a predetermined condition.

  In order to solve the above-mentioned conventional problems, the combustion apparatus of the present invention has a circulation circuit between the outlet side and the inlet side of the main heat exchange apparatus heated by a burner having a rated capacity predetermined for each function. A combustion apparatus having a hot water supply circuit formed, a hot water supply / heating indirect heat exchanger in which the hot water supply circuit and the heating circuit exchange heat, and a hot water bath indirect heat exchanger in which the hot water supply circuit and the bath circuit exchange heat, A normal operation mode in which operation is performed within the rated capacity of hot water supply, heating, and bath functions, and a special operation mode in which operation is performed beyond the rated heating capacity when the operation exceeding the rated heating capacity is required are provided.

According to the above-described invention, it is possible to control the burner combustion within the rated capacity of the appliance within the range of normal use conditions preliminarily assumed at the time of heating use, and rated without exceeding the predetermined appliance rating capability. Consistency with the display can be achieved. In addition, the usage that exceeds the rated capacity temporarily, for example, when starting the heating operation in a state where the room is completely cooled, etc. However, in the present invention, when the required heating capacity exceeds the rated capacity, the capacity set for hot water supply can be temporarily used. Burner combustion can be controlled within the capacity range of the required capacity plus the rated heating capacity and rated hot water capacity.
Even when the heating operation is started in a state where the room temperature is completely cooled, the room temperature can be raised in a short time. In addition, the above special operation mode can be changed only when there is a request to exceed the heating rated capacity, and it is returned to the rated operation mode under other usage conditions. It is an extremely short time, and there is no problem in consistency with the rating display.

  As described above, it is possible to operate beyond the rated capacity of predetermined hot water supply, heating, and bath functions, and the heating capacity of the main heat exchange device can be flexibly used for both the hot water supply side, the heating side, and the bath side. be able to.

  The combustion apparatus of the present invention can control the combustion of the burner within the rated capacity of the appliance within the range of normal use conditions, and the capacity set for hot water supply even when the required heating capacity exceeds the rated capacity. Because it can be used temporarily, the burner combustion can be controlled within the capacity range of the required heating capacity plus the rated heating capacity and rated hot water capacity. Even when the heating operation is started in the above state, the room temperature can be raised in a short time.

  1st invention is a 1 can 3 function combustion apparatus which has a hot water supply heating bath function, The hot water supply circuit which formed the circulation circuit between the exit side of the main heat exchange apparatus heated with a burner, and the inlet side, The said hot water supply circuit Hot water heating / heating indirect heat exchanger that exchanges heat with the heating circuit, and a combustion apparatus that has a hot water / bath indirect heat exchanger that exchanges heat between the hot water supply circuit and the bath circuit, and the rated capacity of predetermined hot water supply, heating, and bath functions And a special operation mode in which operation exceeding the heating rated capacity is requested when an operation exceeding the heating rated capacity is required.

  The burner combustion can be controlled within the rated capacity of the appliance within the range of normal operating conditions assumed in advance when heating is used, and it is consistent with the rating display without exceeding the predetermined appliance rated capacity. Can be improved. Also, the usage that temporarily exceeds the rated capacity, for example, when heating operation is started in a state where the room is completely cooled, etc. However, in the present invention, when the required heating capacity exceeds the rated capacity, the capacity set for hot water supply can be temporarily used. Burner combustion can be controlled within the capacity range of the required capacity plus the rated heating capacity and rated hot water supply capacity, and the room temperature can be reduced in a short time even if the heating operation is started when the room temperature has cooled down. Can be raised. In addition, the above special operation mode can be changed only when there is a request to exceed the heating rated capacity, and it is returned to the rated operation mode under other usage conditions. It is an extremely short time, and there is no problem in consistency with the rating display.

  The second invention is characterized in that it is limited to operate exceeding the rated heating capacity at the start of the heating operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the conventional example and each embodiment, parts having the same configuration and the same operation are denoted by the same reference numerals, and detailed description thereof is omitted. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is an overall configuration diagram of a combustion apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, a combustion device 13 includes a combustion fan 14 that sends combustion air, a burner 15, a main heat exchanger 16 that is a main heat exchange device that receives combustion heat generated by combustion of the burner 15, and main heat exchange. It is the 1st indirect heat exchange apparatus which transfers the heat of the several fin 17 which forms the heater 16, the hot water supply circuit 18 which is a 1st circulation circuit, and the heating circuit 19 which is a 2nd circulation circuit. A hot water heating / indirect heat exchanger 20, a hot water bath indirect heat exchanger 22 that is a second indirect heat exchange device that transfers heat from the hot water supply circuit 18 to a bath circuit 21 that is a third circulation circuit, and the hot water supply circuit 18. Hot water supply of a so-called one-can three-channel system comprising a pressure-resistant pump 23 that circulates water of water, a heating pump 24 that circulates water of the heating circuit 19, and a bath pump 25 that circulates hot water of the bath circuit 21 Bath heating The hot water heated by the main heat exchanger 16 is used directly for hot water supply, and a circulation circuit is formed and heat is supplied to the heating circuit 19 and the bath circuit 21 using the circulating water. It is.

  And the heating burner 15 of the main heat exchanger 16 which is a heat supply source to the hot water supply circuit 18, the heating circuit 19, and the bath circuit 21 is the first burner 15A having a rated combustion input set for heating and a hot water supply. The second burner 15B has a rated combustion input set to, and combusts within the rated combustion input range according to each load requirement. That is, during the heating operation, the combustion amount is controlled according to the heating load within the rated input range in which the first burner 15A can burn, and during the hot water supply operation, according to the hot water supply load within the rated input range in which the second burner 15B can burn. Within the rated input range for the bath set so that the hot water supply performance is not affected when the hot water supply and the bath are operated simultaneously within the rated input range where the second burner 15B can burn during bath operation. The amount of combustion is controlled. The state of operation within the rated combustion input range set for each function is referred to as a rated operation mode, and the conventional two-can three-water channel hot water bath heater can only be operated in the rated operation mode. In other words, in the conventional hot water bath heating device, the hot water bath circuit and the heating circuit are composed of separate can bodies, and each can body has an independent configuration with a burner. It can be burned only within the range of the maximum combustion amount of the burner provided in the body, and can be burned only within the range of the maximum combustion amount of the burner provided in the can body forming the hot water supply circuit during hot water supply operation. It was impossible.

  In the present embodiment, as described above, the hot water heated by the main heat exchanger 16 is directly used for hot water supply, and a circulation circuit is formed and the heating circuit 19 and the bath circuit 21 are heated by using the circulation water. Since the first burner 15A and the second burner 15B that are set with the rated input in advance are used as the burner 15 that heats the main heat exchanger 16, the one-can three-water system is used. In addition to operation, it is possible to operate in a special operation mode exceeding the rated input for each function under predetermined conditions.

  For example, the heating rated combustion input of a normal hot water heater is 15000 kcal / h, and the hot water rated combustion input is 45000 kcal / h, which are independent of each other. At least one of a first burner (heating bath burner) 15A having a total combustion input of 60000 kcal / h and a combustion input of 15000 kcal / h and a second burner (hot water supply burner) 15B having a combustion input of 45000 kcal / h Can be burned. The ability is obtained by multiplying the combustion input by the thermal efficiency, and the combustion input may be interpreted as the ability in the following description.

  Furthermore, a heat-absorbing part 28 and a non-heat-absorbing part are formed by a three-way valve 27 which is a switching means provided on the inlet side of the main heat exchanger 16 with a flow path for passing water through a plurality of heat absorption pipes 26 penetrating the main heat exchanger 16. Switch to 29. The hot water intake pipe 30 and the outlet from which hot water exits are referred to as a hot water outlet pipe 31.

  About the combustion apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  At the time of a cold start that requires heating operation first, such as early in the morning, the pressure pump 23 and the heating pump 24 are driven as a special heating operation mode (special operation mode), and the air and gas of the combustion fan 14 are mixed by the burner 15 and burned. Start maximum combustion with input 60000 kcal / h. That is, by burning the first burner 15 </ b> A and the second burner 15 </ b> B at the same time, a large amount of heat is transferred to the heat absorption pipe 26 through the fins 17 when the combustion heat passes through the main heat exchanger 16. The hot water absorbed by the heat absorption pipe 26 circulates in the hot water supply circuit 18 by the pressure-resistant pump 23, and the hot water in the heating circuit 19 is heated by the hot water supply / heating indirect heat exchanger 20 so that the rising time of heating is set to the rated combustion input 15000 kcal / h. Compared to a single burner, it can be significantly shortened.

  An actual example will be described with reference to FIG. At the time of cold start when heating operation is required first in the early morning or the like, a heating amount of about 7000 kcal is necessary, and the burner exceeds the normal heating operation mode 35 of 15000 kcal / h to the combustion input of special operation mode 36 to 60000 kcal / h. By quickly starting up the heating by burning 15, what took 60 minutes to reach 20 ° C. from room temperature 5 ° C. can be realized in 30 minutes.

  In normal times when high heating capacity is not required, heating is performed only by the burner 15A as a normal heating operation mode (normal operation mode), and the flow path is switched by the three-way valve 27 only to the heat absorption part 28 of the main heat exchanger 16. By passing water, heat dissipation from the non-heat-absorbing part 29 can be suppressed and thermal efficiency can be improved.

  The three-way valve 27 may be omitted and priority may be given to cost reduction instead of improvement in thermal efficiency.

  Similarly, when bath operation is required, the pressure pump 23 and the bath pump 25 are driven as a special bath operation mode (special operation mode), and the air and gas of the combustion fan 14 are mixed by the burner 15 and the combustion input 60000 kcal / By performing maximum combustion of h, bath water heating of the bath circuit 21 can be performed in a short time by the hot water bath indirect heat exchanger 22 to the bath circuit 21 as well.

  An actual example will be described with reference to FIG. When reheating the bathtub water stored on the day before winter, a heating amount of about 6000 kcal is required, exceeding the rated combustion input 11000 kcal / h which is the normal bath operation mode 37, and the combustion input 60000 kcal of the special bath operation mode 38 By boiling up the burner 15 up to / h, what took 32 minutes to boil from 10 ° C. to 40 ° C. with 200 L of bath water can be boiled in 19 minutes.

  When rapid heating is not required, the normal bath operation mode (normal operation mode) is performed by switching the flow path with the three-way valve 27 and heating only with the burner 15A to burn the small capacity and heat the bath. A mild chasing function can be realized, and heat dissipation from the non-heat-absorbing portion 29 can be suppressed to improve thermal efficiency.

  The three-way valve 27 may be omitted and priority may be given to cost reduction instead of improvement in thermal efficiency.

  Of course, when high capacity of rated combustion input of 45000kcal / h or more is required during hot water supply operation, for example, in the case of heating up from 10 ° C to 40 ° C with hot water supply of 3 locations at 9L / min in winter, normal hot water supply operation mode ( As the special hot water supply operation mode (special operation mode), the first burner 15A and the second burner 15B are simultaneously burned to exceed the rated combustion input 45000 kcal / h, which is the normal operation mode), and the maximum combustion of the total combustion input 60000 kcal / h is achieved. Large hot spring capacity equivalent to No. 32 can be realized.

  In the above description, the rated combustion input of the hot water heater is assumed to be a hot water rated combustion input 45000 kcal / h, a heating rated combustion input 15000 kcal / h, and a bath rated combustion input 11000 kcal / h, but a hot water rated combustion input 60000 kcal / h, It may be interpreted that the combustion input required for heating and bath is supplied from the hot water supply combustion input as the heating rated combustion input 15000 kcal / h and the bath rated combustion input 11000 kcal / h.

  As described above, the heating capacity of the main heat exchanger 16 can be used flexibly on the hot water supply side, the heating side, or the bath side, and the heat efficiency is improved by switching the heat absorption part when using the heating or bath alone. it can.

  FIG. 1 shows a state where gas is supplied to the burner 15A and only this portion is combusted. That is, when the room temperature rises to a certain temperature and a steady state heating operation is required, or when a small amount of hot water supply combustion is required such that a small amount of hot water is supplied in a bathroom or kitchen, gas is supplied to the burner 15B. There is no supply and only the air of the combustion fan 14 passes through the non-heat-absorbing part 29 of the main heat exchanger 16.

  At this time, the three-way valve 27 having no complete closing function is switched so that most of the water passing through the main heat exchanger 16 is passed to the heat absorbing portion 28 and a very small amount is passed to the non-heat absorbing portion 29, thereby non-combustion. Water can be heated by the burner 15 </ b> A without being cooled by the part 29.

  Further, since a small amount of water is passed through the non-endothermic portion 29, boiling in the pipe can be prevented by heat absorption due to the heat of the combustion gas leaking in the vicinity of the endothermic portion 28 of the non-endothermic portion 29, and scale adhesion in the endothermic tube is prevented. Can improve durability.

  As a result, a one-can, three-function combustion device having the function of a hot water heating / heating bath can be made compact, and high heat dissipation efficiency can be achieved while minimizing heat loss during heating operation, hot water supply operation, and bath operation with a small amount of combustion. realizable. Furthermore, when maximum combustion is performed, the three-way valve 27 is switched so that the flow path flows to the entire main heat exchanger 16, so that there is no non-combustion portion 29, so that high combustion heat efficiency during hot water supply maximum operation can also be exhibited.

  In the present embodiment, the example of switching between the burner 15A and the burner 15B has been described, but it is naturally possible to adopt a configuration in which each burner is switched more finely and burned. Furthermore, as shown in FIG. 4, even when the three-way valve 27 is provided on the outlet side of the main heat exchanger 16 and the electromagnetic valves 32 that are a plurality of flow control valves are provided on the downstream side of the flow path, the same effect can be exhibited. Can do.

  Further, the three-way valve 27 may be omitted, giving priority to cost over combustion thermal efficiency, and the heating capacity of the main heat exchanger 16 may be flexibly used for any of the hot water supply side, the heating side, and the bath side.

  Therefore, burners and heat exchangers are provided individually for conventional hot water supply, heating, and bath, and the combustion section is simplified compared to hot water supply devices that could not be operated exceeding their rated capacities. The function of the main heat exchanger can be freely distributed with respect to the function that requires the above-mentioned ability, and a highly convenient hot water supply apparatus can be provided.

(Embodiment 2)
In this embodiment, the invention according to claim 6 will be described. FIG. 5 is an overall configuration diagram of the combustion apparatus according to the second embodiment of the present invention. In addition, the same structure as the combustion apparatus of 1st Embodiment gives the same code | symbol, and abbreviate | omits description. In FIG. 3, the difference from the configuration of the first embodiment is that the first circulation circuit also serves as the heating circuit 33, and the circulation device of the heating circuit 33 is a heating pump 34 that is a heating circulation device. Although not shown, a heating radiator is arranged in the heating circuit 33.

  The operation and action of the above configuration will be described. When the heating operation is requested, the heating pump 34 is driven to mix the air and gas of the combustion fan 14 with the burner 15A and start combustion. Since the heating operation requires a smaller amount of combustion than the hot water supply maximum combustion, gas is supplied to the burner 15A and only this portion is burned. The combustion exhaust gas passes through the heat absorption part 28 of the main heat exchanger 16. In the burner 15 </ b> B, only air from the fan 14 passes through the non-heat-absorbing portion 29 of the main heat exchanger 16. At this time, the water can be heated without being cooled by the non-combustion unit 29 by switching the flow path of the water passing through the main heat exchanger 16 so that only the heat absorption unit 28 passes through the three-way valve 27. When a high heating capacity is required, 15A and 15B are combusted, the flow path is switched by the three-way valve 27, and water is passed through the non-heat-absorbing part 29 as well.

  As a result, since it is not necessary to provide the pressure-resistant pump 23, the one-can three-function combustion device having the function of a hot water supply / heating bath can be made compact and low in cost, and the heat radiation loss during the heating operation with a small amount of combustion can be reduced. High combustion heat efficiency can be achieved with a minimum. Furthermore, when the hot water supply maximum capacity is requested, the burners 15A and 15B are combusted, and the three-way valve 27 is switched so that the flow path flows to the entire main heat exchanger 16, so that there is no non-combustion part, so that during hot water supply operation High combustion heat efficiency can be exhibited.

  In the present embodiment, the example of switching between the burner 15A and the burner 15B has been described, but it is naturally possible to adopt a configuration in which each burner is switched more finely and burned. Furthermore, as shown in FIG. 6, even when the three-way valve 27 is provided on the outlet side of the main heat exchanger 16 and a plurality of electromagnetic valves 32 are provided on the downstream side of the flow path, the same effect can be exhibited.

  As described above, the combustion apparatus according to the present invention can realize a compact one-can three-function heat source that performs hot water supply, heating, and bath heating. It can also be installed in places where apartments are installed in small spaces. Further, the present invention can be applied to an oil boiler using kerosene as a heat source as well as gas as a heat source.

1 is an overall configuration diagram of a combustion apparatus according to Embodiment 1 of the present invention. The figure which shows the heating start-up performance of the combustion apparatus in Embodiment 1 of this invention The figure which shows the bath chasing performance of the combustion apparatus in Embodiment 1 of this invention Whole block diagram of combustion apparatus in other embodiment of Embodiment 1 of this invention Whole block diagram of combustion apparatus in Embodiment 2 of the present invention Whole block diagram of combustion apparatus in other embodiment of Embodiment 2 of the present invention Overall configuration diagram of a conventional combustion device

Explanation of symbols

13 Combustor 15A (15) Burner 15B (15) Burner 16 Main heat exchanger (Main heat exchanger)
18 Hot water supply circuit (first circulation circuit)
19 Heating circuit (second circulation circuit)
20 Hot water supply / heating indirect heat exchanger (first indirect heat exchanger)
21 Bath circuit (third circulation circuit)
22 Hot water bath indirect heat exchanger (second indirect heat exchanger)
23 Pressure pump (pressure circulation system)
26 Endothermic tube 27 Three-way valve (switching means)
28 Endothermic part 29 Non-endothermic part 32 Solenoid valve (flow control valve)
33 Heating circuit (first circulation circuit)
35 Normal heating operation mode (normal operation mode)
36 Special heating operation mode (special operation mode)
37 Normal bath operation mode (normal operation mode)
38 Special bath operation mode (special operation mode)

Claims (2)

In a one-can three-function combustion device having a hot water heating / heating bath function, a hot water supply circuit in which a circulation circuit is formed between an outlet side and an inlet side of a main heat exchange device heated by a burner, and the hot water supply circuit and the heating circuit exchange heat. Normal operation that operates within the rated capacity of hot water supply, heating, and bath functions determined in advance, with a combustion apparatus having a hot water supply heating indirect heat exchanger and a hot water bath indirect heat exchanger that exchanges heat between the hot water supply circuit and the bath circuit Combustion device comprising a mode and a special operation mode for operating beyond the rated heating capacity when operation exceeding the rated heating capacity is required. The combustion apparatus according to claim 1, wherein the operation exceeds the rated heating capacity at the start of the heating operation.

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