JP2004116960A - Connection type oil water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection type oil water heater improved in durability of, especially, a burning means in the case of connecting a plurality of oil water heaters and applying the control of the number of equipment. <P>SOLUTION: In this oil water heater, one of a plurality of oil water heaters is assigned as a main (M) water heater for the first combustion, and other following water heaters are assigned as target (T) water heaters for combustion in order, and this assignment is changed per twenty-four hours. The oil water heaters except the M water heater are prohibited from ON/OFF combustion to improve durability, and the only M water heater is allowed for ON/OFF combustion to enable the combustion even if the required number for operation is small. In the range of six or less in combustion requirement scale, the combustion output is adjusted by ON/OFF combustion of the M water heater, and in the range more than six, the number of output is adjusted by proportional combustion. When increased to eighteen, the proportional combustion control rate of the M water heater is reduced down to the proportional combustion control rate of ten, and on, the T water heaters start the proportional combustion from eight to smoothly transfer the combustion. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention connects the outlet paths of a plurality of oil water heaters for burning liquid fossil fuel, and changes the number of combustion operation units based on the plurality of oil water heaters to be controlled according to the required capacity when using hot water. The present invention relates to a connected oil hot water supply device to which the unit control is applied.
[0002]
[Prior art]
Conventionally, while each outlet side of a plurality of hot water boilers is connected to a common hot water supply path to a hot water supply destination, each inlet side is connected to a common return path from the hot water supply destination, and the plurality of hot water boilers are connected. Are known in which the number of operating hot water boilers is changed (number control) according to the load required at the hot water supply destination (for example, see Patent Document 1).
[0003]
On the other hand, in the field of gas water heaters, each outlet side of a plurality of gas water heaters is connected to a common hot water supply path to a hot water supply destination in the same manner as described above, while each water inlet side is connected to a common hot water supply path from the hot water supply destination. A plurality of gas water heaters connected to a return path to control the number of gas water heaters to be operated by combustion according to the required heat load at the hot water supply destination (number control). Is also known (for example, see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent No. 2704549 [Patent Document 2]
JP 2000-205653 A [0005]
[Problems to be solved by the invention]
By the way, in the case of configuring a concatenated hot water supply apparatus using a plurality of gas water heaters, since the combustion means of the gas water heater burns gas (for example, city gas) as fuel, the gas supply amount is reduced. The tapping capacity can be relatively easily adjusted from the small combustion amount region to the large combustion amount region according to the required capacity (required combustion amount) by proportional control or the like.
[0006]
However, when a combined oil water heater is configured by using a plurality of oil water heaters, and unit control is performed for the plurality of oil water heaters to change and switch the number of combustion units according to the required capacity at a hot water supply destination. In this case, there is a possibility that the durability of the oil water heater, particularly the combustion means, may be reduced.
[0007]
That is, since the oil water heater burns liquid fossil fuel such as kerosene as fuel, the combustion means is provided with a burner that sprays kerosene or the like supplied by a fuel supply pipe from a spray nozzle and burns. Is done. In this case, there is a lower limit even if the fuel supply amount by the fuel supply pipe is proportionally controlled, and an on / off combustion control for intermittently burning in a combustion amount smaller than the lower limit is employed. In other words, the change and adjustment of the combustion amount (number of hot water outlets) are performed by the proportional combustion control in the large combustion amount region and the on / off combustion control in the small combustion amount region across a certain boundary. The on / off combustion control as described above is performed by alternately turning on / off a supply pump for pumping kerosene or the like to the spray nozzle.
[0008]
On the other hand, in the unit number control, not all oil water heaters are burned simultaneously and equally, but only one is burned according to the required capacity of the hot water supply destination. If the number of combustion units is increased, or if the number of combustion units is still insufficient, the number of combustion units is increased in the order of the third unit, and the number of combustion units is decreased sequentially in accordance with the decrease in the required capacity.
[0009]
For this reason, the first unit exerts its tapping capacity almost maximally by proportional combustion control, the second unit performs on-off combustion control to compensate for the shortage, or the first unit and the second unit Respectively, the respective tapping capacities are almost maximized by the proportional combustion control, and the third unit may have a combustion state in which on-off combustion control is performed to compensate for the shortage. Such a combustion state can occur both in the process of increasing the required capacity and in the process of decreasing the required capacity. Therefore, if the on / off combustion control is repeated in all the oil water heaters, there is a possibility that the durability of the combustion means including the above-described supply pump may be reduced.
[0010]
On the other hand, when using an oil water heater, on-off combustion control must be employed to satisfy the function of adjusting the tapping capacity in the small combustion amount region.
[0011]
The present invention has been made in view of such circumstances, and an object of the present invention is to adjust the tapping capacity by controlling the number of units when connecting a plurality of oil water heaters and applying the unit control. It is an object of the present invention to provide a connection type oil hot water supply device capable of improving the durability of a combustion means without impairing its function.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a combustion unit capable of changing a combustion amount by changing and adjusting a spray amount of liquid fuel, and a tap outlet is provided on a common hot water supply path following a hot water supply destination. The present invention is directed to a connection type oil water heater including a plurality of connected oil water heaters and a number control means for controlling the number of oil water heaters to be operated for combustion in accordance with the heat load of the hot water supply destination. The following specific items have been provided. That is, the combustion control means for performing combustion control in accordance with the required number of combustions corresponding to the number of combustion units operated by the number control means and the heat load of the hot water supply destination with the respective combustion means of the plurality of oil water heaters as control targets. Prepare. In the single combustion state in which only the first one of the plurality of oil water heaters is operated for combustion, the on / off combustion control in the small combustion amount region is performed according to the required combustion amount. While switching to the proportional combustion control in the large combustion amount range, the on-off combustion control is prohibited in the second and subsequent oil water heaters in the combined combustion state in which two or more oil water heaters are simultaneously operated. Only the proportional combustion control was performed.
[0013]
In the case of the invention according to claim 1, the on / off combustion control is performed only for one oil water heater that is burned in a single combustion state, and the other oil water heaters that are burned simultaneously for the second and subsequent units Since the on / off combustion control is prohibited in the water heater, it is possible to minimize a decrease in durability of the combustion means caused by performing the on / off combustion control. For this reason, it is possible to improve the durability of the combustion means of the second and subsequent oil water heaters constituting the connected oil water heater. In addition, since the on-off combustion control is executed in the oil heater that is burned in the first unit, the combustion amount can be adjusted in a small combustion amount region that cannot be realized by the proportional combustion control. There is no loss of functionality.
[0014]
In the invention according to claim 2, a plurality of oil hot water supply units each including a combustion means capable of changing the combustion amount by changing and adjusting the spray amount of the liquid fuel and having a tap outlet connected to a common hot water supply path following a hot water supply destination. A water heater and a role as a main water heater for first performing a combustion operation for one of the plurality of oil water heaters, and setting the role of the oil water heater including the main water heater for the combustion operation. The following specific items are provided for a connected oil hot water supply device including a unit control means for performing a unit control for changing the number according to the heat load of a hot water supply destination. That is, the combustion control means for performing combustion control in accordance with the required number of combustions corresponding to the number of combustion units operated by the number control means and the heat load of the hot water supply destination with the respective combustion means of the plurality of oil water heaters as control targets. Be prepared. As one of the combustion control means, the on / off combustion control in the small combustion amount region and the proportional control in the large combustion amount region are performed for one oil water heater set as the main water heater in accordance with the required combustion amount. While switching to combustion control, other oil water heaters other than the main water heater are configured to perform only proportional combustion control.
[0015]
In the case of the invention according to claim 2, the ON / OFF combustion control is executed only for one oil water heater assigned as the main water heater, and the ON / OFF combustion control is turned on for other oil water heaters other than the main water heater. Since the off-combustion control is not performed, it is possible to minimize the decrease in durability of the combustion means caused by performing the on-off combustion control to only one main water heater. For this reason, the durability of the combustion means of the remaining number of oil water heaters constituting the connected oil water heater can be improved. In addition, since the on-off combustion control is executed in the oil water heater assigned as the main water heater to be burned first, the combustion amount can be adjusted in a small combustion amount region which cannot be realized by the proportional combustion control. It does not impair the ability to adjust abilities.
[0016]
In the connection type oil hot water supply device of the second aspect, as the number control means, a configuration may be added in which the role of the main water heater is changed by rotation to the plurality of oil water heaters. Item 3). In this case, the main water heater for which the on / off combustion control is performed is sequentially changed not only to a specific oil water heater but also to other oil water heaters. It is possible to evenly disperse the decrease in durability due to the execution, and it is possible to improve the durability of the entire connection type oil hot water supply device.
[0017]
Further, as the combustion control means in the connection type oil water heater of the second or third aspect, in addition to the single combustion state in which only one oil water heater assigned to the main water heater is burned, At the time of a transition from the oil combustion water heater other than the main water heater to the combined combustion state in which the oil water heater other than the main water heater is burned at the same time, the proportional combustion control amount of the oil water heater as the main water heater is increased or decreased. A configuration may be added to start the proportional combustion of the oil water heater to smoothly increase or decrease the tapping capacity at the time of the mutual transition (claim 4). In this case, it is possible to smoothly increase or decrease the tapping capacity in accordance with the increase or decrease in the required capacity of the hot water supply destination, and it is more preferable to adjust the tapping capacity of the entire coupled oil hot water supply device while improving the durability. It can be realized in a state.
[0018]
【The invention's effect】
As described above, according to the connected oil hot water supply device of the first aspect, the decrease in durability of the combustion means caused by performing on / off combustion control is minimized to only one unit in the single combustion state. And the durability of the combustion means of the remaining number of oil water heaters constituting the connected oil water heater can be improved. In addition, by performing the on / off combustion control in the oil heater that is burned in the first unit, it is possible to realize the combustion amount adjustment in a small combustion amount region that cannot be realized by the proportional combustion control, and to improve the tapping capacity. The function of adjustment is not impaired.
[0019]
According to any one of the second to fourth aspects of the present invention, the durability of the combustion means due to the on / off combustion control is reduced to only one main water heater. Thus, the durability of the combustion means of the remaining oil water heater that constitutes the combined oil water heater can be improved. Moreover, by performing the on / off combustion control in the oil water heater assigned as the main water heater to be burned first, it is possible to realize a combustion amount adjustment in a small combustion amount region that cannot be realized by the proportional combustion control. The function of adjusting the tapping capacity is not impaired.
[0020]
In particular, according to the third aspect, since the main water heater for which the on / off combustion control is executed is assigned not only to a specific oil water heater but also to other oil water heaters in order, the on / off operation is performed. The decrease in durability associated with the execution of the combustion control can be evenly dispersed, and the durability of the entire coupled oil hot water supply device can be improved.
[0021]
Furthermore, according to the fourth aspect, the hot water supply capacity can be smoothly increased or decreased when the transition is made between the single combustion state and the combined combustion state in accordance with the increase or decrease in the required capacity of the hot water supply destination. , The function of adjusting the tapping capacity of the entire coupled oil hot water supply device can be realized in a more preferable state.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 shows a connection type oil hot water supply apparatus according to an embodiment of the present invention. This connection type oil hot water supply apparatus is obtained by connecting a plurality of (three in the illustrated example) oil water heaters 2a, 2b, 2c, and each of the oil water heaters 2a, 2b, 2c is individually equipped with an individual controller 28a. , 28b, 28c by the system controller 4.
[0024]
The connection type oil hot water supply device has a water supply path 5 whose upstream end is connected to a tap water supply source such as a water pipe, for example, and whose downstream side is branched to supply water to the water inlet 220 of each of the oil water heaters 2a, 2b, 2c. The upstream end is connected to the tap 230 of each of the oil water heaters 2a, 2b, 2c via the electromagnetic on-off valves 6a, 6b, 6c, and the downstream end is one or more (only one is shown in the figure). And a hot water supply path 8 connected to a tap (hot water supply curan) 7. The on-off valves 6a, 6b, 6c are controlled to open and close by a system controller 4, and when opened, water is supplied from a water supply path 5 to a corresponding oil water heater and hot water is supplied from the oil water heater to a water supply path 8. It becomes possible. Further, a check valve 51 for preventing a backflow is provided in the water supply path 5 at an upstream position.
[0025]
Each of the oil water heaters 2a, 2b, and 2c burns fuel such as kerosene to heat the water input from each of the water inlets 220, and outputs the heated water to each of the water outlets 230. As long as it has such a function, another type not using the heat exchanger 21 described later can be used. Details of what is applied as each of these oil water heaters 2a, 2b, 2c will be described below based on an example shown in FIG.
[0026]
Each of the oil water heaters 2a, 2b, and 2c includes a heat exchanger 21 provided in the combustion can body 20 and a water inlet pipe 22 through which water from the water supply path 5 flows into the heat exchanger 21 through a water inlet 220. A tapping pipe 23 for tapping the hot water heated by the heat exchanger 21 to the tap hole 230, a bypass pipe 24 for mixing water with the tapping water from the heat exchanger 21; The burner 25 includes a burner 25 that heats the heater 21 by combustion heat, and a fuel supply pipe 27 that supplies fuel (kerosene) from a fuel tank 26 to the burner 25.
[0027]
The incoming water pipe 22 is provided with an incoming water temperature sensor 221 and an incoming water flow rate sensor 222, while the outgoing water pipe 23 is heated by the combustion can body 20 to a position on the upstream side of a merging position with the downstream end of the bypass pipe 24. A tapping temperature sensor 231 for detecting the tapping temperature after the tapping is provided, and a water quantity servo valve 232 and a tapping temperature sensor 233 are provided at a position downstream of the merge position. The bypass pipe 24 is provided with a hot / water mixing valve 241 for mixing the hot water from the hot water pipe 23 with the water from the water inlet pipe 22 at a predetermined mixing ratio.
[0028]
The burner 25 is disposed so as to inject the flame downward, and is constituted by, for example, a gun type burner having a return type spray nozzle 250. The burner 25 sprays and burns kerosene supplied through a fuel supply pipe 27 in which an electromagnetic on-off valve 251 and an electromagnetic supply pump 252 are interposed, from a spray nozzle 250, and converts a part of the supplied kerosene into a return pipe 253. To the fuel supply pipe 27 between the electromagnetic opening / closing valve 251 and the electromagnetic supply pump 252. As shown in detail in FIG. 3, the return pipe 253 has an oil temperature detection sensor 254 for detecting the oil temperature of the return oil, a flow control valve 255 for proportionally controlling the flow rate of the return oil, and the return oil on the return side. A check valve 256 for flowing only is interposed. Combustion means is constituted by each of the above components 251 to 256 including the burner 25.
[0029]
The on / off combustion control of such a combustion means is performed by alternately turning on / off the electromagnetic supply pump 252 with the flow rate control valve 255 fixed at a predetermined constant opening degree to turn on combustion and off combustion. Is repeated. In the proportional combustion control, the flow rate of the return oil by the flow rate control valve 255 is changed and adjusted proportionally according to the required number, and the spray amount from the burner 25 is changed and adjusted to a value corresponding to the required number. It is done by doing. With the above on-off combustion control, for example, it is possible to change and adjust the number of outputs (burning amount) in the small tapping capacity region (small burning amount region) from No. 1.6 to No. 6, for example, by the proportional combustion control. It is possible to change and adjust the number of outputs (burning amount) in the large tapping capacity range (large burning amount region) from No. to 25.5.
[0030]
Each of the individual controllers 28a, 28b, 28c is connected to the system controller 4 through a communication line so as to be capable of bidirectional communication, and receives various commands based on control of the number of units by the system controller 4, for each of the oil water heaters 2a, 2b, 2c. Control such as combustion operation and combustion stop is performed. Note that the above two-way communication may be performed by a wireless method instead of a wired method.
[0031]
As shown in FIG. 4, the system controller 4 is connected to a main remote controller 41 and includes a number control unit (number control unit) 42 and a combustion control unit (combustion control unit) 43. The system controller 4 may be provided separately from each of the oil water heaters 2a, 2b, 2c. However, it is preferable that the system controller 4 be incorporated in any one of the oil water heaters (2c in the example of FIG. 1) from the viewpoint of compactness. preferable. In the following description, of the three oil water heaters, the one with reference numeral 2a is the first oil water heater, the one with 2b is the second oil water heater, and the one with 2c is the third oil water heater. The individual controllers 28a, 28b, 28c and the opening / closing valves 6a, 6b, 6c are also used by attaching first to third, respectively.
[0032]
The number control unit 42 changes and adjusts the number of oil water heaters 2a, 2b, 2c to be operated in combustion in accordance with a required load (heat load) when hot water is used in the hot water tap 7. Is the main water heater (water heater that ignites and burns first) M, one is an adjustment water heater (water heater that ignites and burns last for auxiliary adjustment) R, and the rest is the target water heater (main water heater) , A role is assigned as a water heater (T) which sequentially ignites and burns when the required load cannot be satisfied. In addition, the three types of role settings of the main water heater M, the target water heater T, and the adjustment water heater R are set such that rotation is sequentially changed every cycle with a predetermined period (for example, 24 hours) as one cycle. The main water heater M having the highest combustion frequency is sequentially changed by all the oil water heaters 2a, 2b, and 2c so as to be equally allocated.
[0033]
The rotation setting will be described based on the example of FIG. In the present embodiment, the connected oil hot water supply device is composed of three oil hot water heaters 2a, 2b, and 2c, so that one oil hot water heater is assigned to the main water heater and the other is assigned to the adjustment hot water heater R. The remaining one is assigned as the target water heater T. In cycle 1 (first 24 hours), the first oil water heater 2a is assigned to the main water heater M, the second oil water heater 2b is assigned to the target water heater T, and the third oil water heater 2c is assigned to the adjustment water heater R. Then, in cycle 2 (next 24 hours), the first oil water heater 2a is used as the target water heater T, the second oil water heater 2b is used as the adjusting water heater R, and the third oil water heater 2c is used as the main water heater M. In cycle 3 (further 24 hours), the first oil water heater 2a is set to the adjusting water heater R, the second oil water heater 2b is set to the main water heater M, and the third oil water heater 2c is set to the target water heater. T is assigned to each, and in cycle 4, the process returns to the assignment setting in cycle 1 described above, and the above-described rotation setting is repeated.
[0034]
Here, for example, in the above-described cycle 1, in a standby state in which hot water supply from the hot water tap 7 is not used, only the first opening / closing valve 6a of the main hot water supply M (the first oil water heater 2a) is normally opened. The on-off valves 6b and 6c of the target water heater T and the adjusting water heater R are maintained in the closed state. That is, the water supply path 5, the hot water supply path 8, and the hot water tap 7 are maintained in a state of being communicated only via the main water heater M (the first oil water heater 2a and the first on-off valve 6a).
[0035]
When the hot water tap 7 is opened, water is supplied from the water supply path 5 through the water inlet 220 to the water inlet pipe 22 of the first oil water heater 2a. The burner 25 of the first oil water heater 2a is burned, and hot water of a predetermined temperature heated by the heat exchanger 21 is discharged into the hot water supply path 8 through the hot water pipe 23, the hot water outlet 230, and the open / close valve 6a. Hot water is supplied to the hot water tap 7 through the hot water supply path 8. If the request from the hot water tap 7 becomes larger than the maximum set tapping capacity of the first oil water heater 2a which is the main water heater M, the second on-off valve 6b is further opened to open the second oil which is the target water heater T. The water is also supplied to the water heater 2b and the combustion operation is performed in the same manner as described above. If the total water supply capacity of the two oil water heaters 2a and 2b is larger than the maximum set water supply capacity, the third opening / closing valve 6c of the adjusted water heater R Is opened, the third oil water heater 2c is operated for combustion. Conversely, if the demand from the hot water tap 7 becomes smaller, the number of oil water heaters to be stopped and burned in the reverse order to reduce the number of oil water heaters to be burned is reduced accordingly.
[0036]
The combustion control by the combustion control unit 43 for each of the oil water heaters 2a, 2b, 2c set as the three types of the main water heater M, the target water heater T, and the adjusted water heater R as described above is performed as follows. .
[0037]
That is, as shown in FIG. 6, among the oil water heaters 2 a, 2 b, and 2 c, those assigned and set as the main water heater M have a small hot water supply capacity range (in FIG. 6, the output of No. 1.6 to No. 6). The above-mentioned on / off combustion control is performed for the number range, and the above-described proportional combustion control is performed for the large hot water capacity range (similarly, the output number range of No. 6 to 25.5). These two combustion controls are switched according to the required capacity (the required number) when using hot water from the hot water tap 7. And, for those assigned and set as the target water heater T and the adjusted water heater R other than the main water heater M, the on / off combustion control is prohibited and only the proportional combustion control in the large tapping capacity range is performed. I do. That is, the on / off combustion control is performed only in the main water heater M and is not performed in the other target water heater T and the adjusted water heater R. In FIG. 6, the main water heater M is displayed as "M water heater", the target water heater T is displayed as "T water heater", and the adjusted water heater R is displayed as "R water heater" (FIG. 7 and FIG. 8).
[0038]
Under such a limitation, when only the main water heater M is burned by the number controller 42 in accordance with the required capacity, in addition to this, the target water heater T is also burned to increase the number of burned water. The combustion control by the combustion control unit 43 will be described based on the example of FIG.
[0039]
That is, in the single combustion state of only the main water heater M, if the required number corresponding to the required capacity is in the small tapping capacity range from 1.6 to 6, the on / off combustion control (ON / OFF combustion control) is performed. Combustion is performed with the number of powers corresponding to the required number. If the required number is greater than 6, the required number is reduced by a predetermined amount smaller than the maximum output number (25.5) to 18 by proportional combustion control. The combustion is performed with the output number corresponding to the number (see the solid broken line with arrow in FIG. 7). Thereby, even if the required number of hot water is in the small tapping capacity range from No. 1.6 to No. 6, it can be handled by the on / off combustion control by the main water heater M, without impairing the hot water supply function. , Without impairing usability.
[0040]
If the required number is larger than 18, the target water heater T in addition to the main water heater M is also operated to burn and shift to the connected combustion state. At this time, the control amount in the proportional combustion control of the main water heater M is reduced and adjusted by at least the minimum control amount in the proportional combustion control of the target water heater T so that the output number smoothly increases and shifts. The proportional combustion control of the vessel T is started. In the example of FIG. 7, the control amount of the main water heater M is reduced by the amount of No. 8 as the reduction adjustment amount, while proportional combustion control is started from the target number of output water heaters T of the No. 8 (FIG. 7). , A dashed line with an arrow). After the simultaneous combustion of the main water heater M and the target water heater T is started, the control amount of the bi-proportional combustion control is increased as the required number of both increases. Thereby, the total control amount (total of both output numbers) of the both proportional combustion control of the main water heater M and the target water heater T is made to match the required number.
[0041]
Further, when simultaneously burning three units including the adjusted hot water supply R, the reduced adjustment amount corresponding to at least the minimum control amount in the proportional combustion control of the third adjusted hot water supply R as described above. After reducing the control amount of one or two units that have been performing the proportional combustion control up to that point, the third unit is started with the proportional combustion control. As described above, even if the target water heater T and the adjusted water heater R are not controlled to perform on / off combustion control, the first water heater M of the main water heater M and the target water heater T are simultaneously fired at the start of the second combustion or further. At the start of combustion of the third unit of the adjusted water heater R, the output number can be smoothly increased in accordance with the increase in the required number.
[0042]
Conversely, when the number of combustion units is reduced due to the reduction in the required number, the output number is smoothly reduced by increasing the amount. That is, as shown in the example of FIG. 8, when the main water heater M and the target water heater T are simultaneously burned, the state shifts from the combined combustion state to the single combustion state of only the main water heater M with the reduction in the required number. First, when the required number is reduced to 20, the target water heater T increases the degree of reduction of the control amount of the proportional combustion control (see the broken line with a dashed line with an arrow in FIG. 8) while maintaining the main hot water supply. The control amount of the proportional combustion control of the vessel M is maintained substantially constant (see the solid broken line with an arrow in the figure). Then, when the required number of water heaters is reduced to 16, the combustion of the target water heater T is stopped, while the control amount of the proportional combustion control of the main water heater M is increased to 16 and the output water number is increased to 16. To be. Thereafter, if the required number is reduced, the control amount of the proportional combustion control of the main water heater M is reduced accordingly. If the required number is reduced to less than 6, the combustion control of the main water heater M is turned on.・ Switch to off-combustion control so that the output number is equivalent to the required number.
[0043]
As described above, when the number of combustions increases or decreases due to the increase or decrease of the required number, in order to smooth the output number at the time of the shift, in the example of FIGS. The hysteresis area (see FIG. 8) is provided in the range of FIG.
[0044]
As described above, the on / off combustion control is not executed for each burner 25 of the other two oil water heaters other than the one oil water heater assigned to the main water heater M. In addition, each of the electromagnetic supply pumps 252 does not repeatedly switch on and off. Therefore, the durability of the electromagnetic supply pump 252 or the like does not decrease due to the execution of the on / off combustion control, and the durability can be improved. In addition, since the main water heater M is sequentially changed and assigned to other oil water heaters according to the rotation setting, the decrease in durability due to the execution of the on / off combustion control in the main water heater M is reduced by the number of oil water heaters 2a. , 2b, and 2c.
[0045]
<Other embodiments>
Note that the present invention is not limited to the above-described embodiment, but includes various other embodiments. That is, in the above embodiment, the case where three oil water heaters are connected to form a connected oil water heater is shown. However, the number may be two or more, for example, 10, 20, or more. The connection type oil hot water supply device of the present invention may be configured by connecting a plurality of the connection types.
[0046]
In the above embodiment, the output number range from No. 1.6 to No. 6 is set as the small combustion amount region (Koide hot water capacity region), and No. 6 to No. 25.5 is set as the large combustion amount region (Oide hot water capacity region). Although the output number ranges up to the above are shown, these numbers are merely examples, and the boundary between the two combustion amount ranges may be determined by the minimum limit of proportional combustion determined by the specification of the combustion means.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of the present invention.
FIG. 2 is a schematic diagram showing an example of each oil water heater constituting the embodiment.
FIG. 3 is an enlarged schematic view of a combustion unit including a burner.
FIG. 4 is a block diagram of a system controller according to the embodiment;
FIG. 5 is a table showing an example of rotation of main, target, and adjustment for each cycle.
FIG. 6 is a table showing the relationship between the number of outputs of each of the main (M), target (T) and adjustment (R) water heaters and combustion control.
FIG. 7 is a chart showing a method for changing and adjusting the number of outputs of each water heater with respect to the required number when the required number increases.
FIG. 8 is a chart showing a method of changing and adjusting the number of outputs of each water heater with respect to the required number when the required number is reduced.
[Explanation of symbols]
2a, 2b, 2c Oil water heater 7 Hot water tap (hot water supply destination)
8 Hot water supply path 25 Burner (part of combustion means)
42 Number control unit (number control means)
43 Combustion control unit (combustion control means)
230 Outlet

Claims (4)

A plurality of oil water heaters each having a combustion means capable of changing the amount of combustion by changing and adjusting the spray amount of the liquid fuel and having a tap outlet connected to a common hot water supply path following a hot water supply destination; A connection type oil hot water supply device comprising: a number control means for controlling the number of the water heaters in accordance with the heat load of the hot water supply destination;
Combustion control means for controlling combustion in accordance with a required combustion amount corresponding to the number of combustion units operated by the number control means and the heat load of the hot water supply destination with each combustion means of the plurality of oil water heaters as a control object,
The combustion control means controls on / off combustion control in a small combustion amount region and large combustion in accordance with the required combustion amount when only the first of a plurality of oil water heaters is operated in a single combustion state. While switching to proportional combustion control in the quantity range, when two or more oil water heaters are in a combined combustion state in which combustion operation is performed simultaneously, on-off combustion control is prohibited in the second and subsequent oil water heaters and proportional combustion is performed. A connection type oil hot water supply device configured to perform only control. A plurality of oil water heaters each having a combustion means capable of changing the amount of combustion by changing and adjusting the spray amount of the liquid fuel and having a tap outlet connected to a common hot water supply path following a hot water supply destination; and the plurality of oil heaters After assigning and setting the role of the main water heater for performing the first combustion operation to any one of the water heaters, the number of oil water heaters including the main water heater and performing the combustion operation is assigned to the heat load of the hot water supply destination. A connected oil hot water supply device comprising:
Combustion control means for controlling combustion in accordance with a required combustion amount corresponding to the number of combustion units operated by the number control means and the heat load of the hot water supply destination with each combustion means of the plurality of oil water heaters as a control object,
The combustion control means controls on / off combustion control in a small combustion amount region and proportional combustion control in a large combustion amount region in accordance with a required combustion amount for one oil water heater set as the main water heater. A connection type oil hot water supply apparatus characterized in that only proportional combustion control is performed for an oil water heater other than the main water heater. It is a connection type oil hot water supply apparatus of Claim 2, Comprising:
The coupled oil hot water supply device, wherein the number control means is configured to change the role of the main water heater to the plurality of oil water heaters by rotation. It is a connection type oil hot water supply apparatus of Claim 2 or Claim 3, Comprising:
The combustion control means includes a single combustion state in which only one oil water heater assigned to the main water heater is burned, and a connection in which other oil water heaters other than the main water heater in addition to the main water heater are simultaneously burned. In the mutual transition between the combustion mode and the combustion state, the proportional combustion control amount of the oil water heater, which is the main water heater, is increased or decreased, and then the other oil water heater is started to perform the proportional combustion. A connected oil hot water supply device configured to smoothly increase or decrease the tapping capacity at the time.

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