JP2017044442A - Composite heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve heating capacity shortage upon priority control of hot water supply side when using hot water supply and heating at the same time, in a composite heat source machine including: a combustion part 11 for hot water supply composed so as to permit control for switching to any of a plurality of capacity stages in which combustion capacity overlaps with each other; a combustion part 33 for heating; a gas proportional valve 24 provided on a gas supply path 22 common to the combustion parts 11, 33; and a controller 6 which controls switching of the capacity stages of the combustion part for hot water supply and opening of the gas proportional valve 24 such that a hot water supply temperature gets to a preset temperature.SOLUTION: When an opening of a gas proportional valve 24 is small, a combustion part 11 for hot water supply is switched to a capacity stage lower by one stage, the opening of the gas proportional valve 24 is largely controlled according to hot water supply operation control and, thereby, the hot water capacity is maintained as much as possible and, at the same time, the heating capacity is largely secured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a combined heat source apparatus having two combustion sections that are supplied with fuel from a common flow control valve and heat different heat exchangers.

  The applicant of the present application discloses a bathroom heating / drying system with a mist function in Patent Document 1 below. This bathroom drying system includes a heat source device having a hot water supply function and a hot water circulation heating function, a mist unit as an outdoor unit for supplying water for mist, an indoor unit as an indoor unit, and a ventilation device.

  The heat source device disclosed in Patent Document 1 is configured as a so-called two-can two-water channel in which a hot water supply system and a warm water circulation system for heating have independent combustion can bodies, but for cost reduction and the like, A composite heat source machine as disclosed in Patent Document 2 below may be used.

  This composite heat source machine has a second heat exchange for heating that circulates hot water between a first burner (first combustion section) that heats the first heat exchanger for hot water supply and a heating terminal (such as a mist unit). And a single proportional valve (flow control valve) provided in a common gas supply path for the first and second burners. Moreover, the 1st and 2nd burner is comprised so that a combustion area can be switched to a wide-narrow multiple stage by the capacity switching valve, respectively. During simultaneous operation of hot water supply and heating, the combustion area of the first burner is switched so that the hot water supply hot water temperature becomes a predetermined set temperature, and the combustion capacity of the first burner is controlled by a proportional valve. Thus, the combustion area of the second burner is configured to be switched between wide and narrow.

JP 2007-212096 A Japanese Patent No. 4050735

  As described above, in the conventional combined heat source apparatus, the hot water supply priority control is performed during the simultaneous operation of hot water supply and heating, and the proportional valve and the capacity switching valve of the first burner are set so that the hot water supply hot water temperature becomes the set temperature. It is configured to control the combustion capacity.

  However, as shown in FIG. 1, for example, the first burner for hot water supply is configured to be switchable to five stages of capacity stages N1 to N5, and a small combustion capacity region with a capacity stage number N4 during simultaneous operation of hot water supply and heating. In the state where the capacity switching valve and the proportional valve are controlled so that the first burner burns in A4, the gas pressure supplied to the first and second burners is relatively low, and therefore the combustion area of the second burner is maximized. However, the combustion capability of the second burner is insufficient, and the heating hot water temperature becomes lower than the required hot water temperature, so that the heating performance cannot be ensured, and thus the room temperature cannot be raised. In particular, in the bathroom heating / drying system with a mist function disclosed in Patent Document 1, the heating side has a large capacity in order to perform reheating of hot water on the hot water supply side with hot hot water on the heating side and heating of hot air. In addition, since the hot water supply is simultaneously operated for the mist, there is a problem that the heating capacity is insufficient depending on the control state of the hot water supply side, and it becomes impossible to appropriately heat the bathroom before bathing.

  Therefore, the present invention provides a composite heat source machine having two combustion sections that are supplied with fuel from a common flow control valve and heats different heat exchangers, and prioritizes the combustion capacity in one combustion section. An object of the present invention is to avoid the shortage of the combustion capacity in the other combustion section due to the small opening of the flow control valve while controlling.

  In order to achieve the above object, the present invention takes the following technical means.

  That is, the present invention is configured to be switchable and controllable to any one of a plurality of capacity stages, and the first combustion unit that heats the first heat exchanger, the second combustion unit that heats the second heat exchanger, A flow rate control valve provided in a common fuel supply path for the first and second combustion sections to adjust the combustion capacity of the first and second combustion sections, and the first combustion section to achieve a necessary combustion capacity that satisfies a predetermined condition And a combustion capacity adjustment control means for controlling the opening degree of the flow rate control valve, the combustion capacity adjustment control means is configured such that the combustion capacity of the second combustion section is in a predetermined shortage state. Yes, the first combustion section is switched to a predetermined capacity stage number other than the minimum capacity stage number among the plurality of capacity stage numbers, and the first combustion section performs a combustion operation in a predetermined small combustion capacity region in the capacity stage number The flow rate control When the opening degree of the valve is controlled, the second combustion section has a combustion capacity increasing function for switching the first combustion section to the next lower capacity stage (Claim 1). .

  According to the composite heat source apparatus of the present invention, the opening degree of the flow rate control valve is controlled to be relatively small by the combustion capacity adjustment control means so that the first combustion section performs a combustion operation in a small combustion capacity region with a predetermined capacity stage number. Thus, when the temperature of the hot water from the second heat exchanger does not reach a predetermined required temperature or set temperature, the number of capacity stages of the first combustion section is switched down by one stage, and the combustion of the first combustion section Since the opening degree of the flow rate control valve is controlled so as to maintain the capacity, the opening degree of the flow rate control valve becomes larger and the fuel pressure supplied to the first and second combustion sections also becomes larger. While maintaining the tapping temperature, the tapping temperature from the second heat exchanger can be raised.

  The second combustion section combustion capacity increasing function is such that the first combustion section is switched to a predetermined capacity stage number other than the minimum capacity stage number among the plurality of capacity stage numbers, and the combustion capacity adjustment control means adjusts the capacity stage number. It is preferable that the first combustion unit is in a state where the combustion operation is performed in a predetermined small combustion capacity region for a predetermined time, and the predetermined time is, for example, 5 minutes to 6 minutes. it can. Thus, by providing a certain waiting time for the execution of the second combustion part combustion capacity increasing function, the second combustion part combustion capacity increasing function is executed in a state where the capacity stage number of the first combustion part is stable. Thus, it is possible to avoid frequently switching the capacity stage number of the first combustion section. Further, whether or not “the combustion capacity of the second combustion section is in a predetermined shortage state” can be determined by an appropriate combination of one or more conditions. For example, (1) a mist operation request or the like Combustion in the second combustion section such that the opening degree of the flow control valve is relatively small in spite of a demand for high-capacity heating operation, and (2) the tapping temperature of the second heat exchanger is not heated to a predetermined temperature. It is possible to determine based on appropriate information that is predicted to be insufficient or that is determined or estimated to be insufficient.

  In the composite heat source apparatus of the present invention, the small combustion capacity region of the predetermined capacity stage number overlaps with the large combustion capacity area of the capacity stage number one stage below the capacity stage number, and the combustion capacity adjustment control Before the execution of the second combustion part combustion capacity increasing function, the means maintains the combustion capacity of the first combustion part before and after the first combustion part is switched to the next lower capacity stage by the second combustion part combustion capacity increase function. Control may be performed to increase the opening of the flow control valve after execution (claim 2). According to this, since the small combustion capacity region of the predetermined capacity stage and the large combustion capacity area of the capacity stage one stage below are overlapped, the first combustion section is By controlling the opening degree of the flow rate control valve before and after switching to the next lower capacity stage, the combustion capacity of the second combustion section can be increased while maintaining the combustion capacity of the first combustion section.

  The hot water limiting means further reduces the required combustion capacity of the first combustion section that satisfies the predetermined condition, and the hot water limiting means has a combustion capacity of the second combustion section in a predetermined shortage state, and When the opening degree of the flow rate control valve is controlled so that one combustion section performs a combustion operation with a combustion capacity larger than the small combustion capacity region in the predetermined capacity stage number, the first combustion section is controlled by the combustion capacity adjustment control means. May be configured to reduce the required combustion capacity of the first combustion section so that the combustion operation is performed in the small combustion capacity region of the predetermined capacity stage (Claim 3). According to this, the first combustion section is in a combustion operation with a combustion capacity larger than the small combustion capacity region at the predetermined capacity stage number. However, since the opening of the flow control valve is near the middle, the second heat exchanger Reducing the required combustion capacity of the first combustion section for maintaining the tapping temperature at the set temperature by limiting the amount of tapping from the first heat exchanger when the tapping temperature from the tank does not reach the predetermined temperature As a result, the first combustion section performs the combustion operation in the small combustion capacity region, and the execution condition of the second combustion section combustion capacity increasing function can be satisfied.

  In the control for reducing the required combustion capacity by the hot water limiting means, the state in which the first combustion section is in a combustion operation with a combustion capacity larger than the small combustion capacity region of the predetermined capacity stage is a predetermined time (for example, several minutes). ) It is preferable to execute it when it continues.

  In the composite heat source machine of the present invention, the first combustion section is preferably a hot water supply combustion section, and the second combustion section is preferably a heating combustion section. According to this, while performing the hot water supply priority control, the state where the supply pressure of the fuel to the first and second combustion units continues to be low, the heating-side hot water temperature is lower than the required hot water temperature, Therefore, the room temperature can be reliably raised during the heating operation.

  Further, in the composite heat source apparatus of the present invention, the hot water discharged from the hot water heat exchanger is used for mist spraying, and the hot water discharged from the heating heat exchanger is reheated and heated by hot air for mist spraying. It can be used suitably for the mist system used for the purpose. Further, the combustion capacity adjustment control means can be configured to determine that the combustion capacity of the second combustion section is in a predetermined shortage state when there is a mist operation request from an external mist system. According to this, for example, when the combined heat source machine has a standard hot water supply capacity of No. 24 for home use, the mist operation is performed by a standard home mist system for heating a bathroom of a standard size. In this case, by performing the control according to the present invention as a lack of heating capacity, it is possible to ensure both the hot water supply capacity and the heating capacity necessary for the mist operation.

  As described above, according to the composite heat source apparatus of the first aspect of the present invention, the flow rate control valve is controlled by the combustion capacity adjustment control means so that the first combustion section performs the combustion operation in the small combustion capacity region at the predetermined capacity stage number. By controlling so that the opening degree of the engine becomes relatively small, the capacity stage number of the first combustion section is lowered by one stage when the temperature of the hot water from the second heat exchanger does not reach a predetermined required temperature or set temperature. Since the opening degree of the flow rate control valve is controlled so that the combustion capacity of the first combustion part is maintained, the opening degree of the flow rate control valve is increased and the fuel pressure supplied to the first and second combustion parts is also increased. It becomes large and can raise the tapping temperature from a 2nd heat exchanger, maintaining the tapping temperature from a 1st heat exchanger.

  Further, according to the composite heat source apparatus according to claim 2 of the present invention, since the small combustion capacity region having the predetermined capacity stage number and the large combustion capacity area having the capacity stage number one stage below are overlapped, While maintaining the combustion capacity of the first combustion section by controlling the opening of the flow control valve before and after the first combustion section is switched to the next lower capacity stage by the combustion section combustion capacity increasing function, The combustion capacity can be increased.

  Further, according to the composite heat source apparatus according to claim 3 of the present invention, the first combustion section is in a combustion operation with a combustion capacity larger than the small combustion capacity region at the predetermined capacity stage number, but the opening degree of the flow control valve When the tapping temperature from the second heat exchanger does not reach the predetermined temperature because the temperature is near the middle, the amount of tapping from the first heat exchanger is limited to maintain the tapping temperature at the set temperature. The required combustion capacity of the first combustion section can be reduced, whereby the first combustion section performs a combustion operation in the small combustion capacity region, and the execution condition of the second combustion section combustion capacity increasing function can be satisfied. .

  Further, according to the composite heat source apparatus according to claim 4 of the present invention, heating is performed due to the fact that the supply pressure of fuel to the first and second combustion sections continues to be low while performing hot water supply priority control. It can be avoided that the side hot water temperature is lower than the required hot water temperature, and the room temperature can be reliably raised during heating operation. Further, according to the composite heat source apparatus according to claim 5, for example, when the composite heat source apparatus has a standard hot water supply capacity for home use, a standard household for heating a bathroom of a standard size is used. When the mist operation is performed by the mist system, the control according to the present invention is performed because the heating capacity is insufficient, so that both the hot water supply capacity and the heating capacity necessary for the mist operation can be ensured.

It is a capacity | capacitance characteristic graph which shows the combustion capacity of each capacity | capacitance stage number of a 1st combustion part in the relationship between the opening degree of a gas proportional valve (flow control valve), and a combustion capacity (tapping capacity). 1 is an overall schematic diagram of a bathroom heating / drying system with a mist function that operates using a composite heat source machine of the present invention as a heat source.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows a bathroom heating / drying system (mist system) with a mist function that operates using a composite heat source machine 1 having both a hot water supply function and a hot water circulation heating function according to an embodiment of the present invention as a heat source. A mist unit 2 as an outdoor unit for supplying water for mist, an indoor unit 3 installed on a wall surface or ceiling of a bathroom, and a ventilation device 4 are provided. In addition, since the structure of the mist unit 2, the indoor unit 3, and the ventilation apparatus 4 is the same as that of what was disclosed by the said patent document 1, detailed description is abbreviate | omitted. In addition, a mist system can also be comprised as what does not have a bathroom drying function but provides only a mist function.

  The composite heat source unit 1 heats the water supplied in the hot water supply path to supply hot water to an external hot water supply destination (such as the hot water tap 5 and the mist unit 2), and heats the hot water in the heat medium circulation path. A heating system that circulates and supplies to an external heating terminal (in the illustrated example, the mist unit 2 and the indoor unit 3) and a heat source controller 6 that controls these combustion operations are provided. The composite heat source machine 1 of this embodiment is configured as a so-called 1-gas 1-fan type composite heat source machine that includes a combustion can body 7 and a common combustion fan 8 that share a hot water supply system and a heating system.

  The hot water supply system exchanges heat between the hot water supply heat exchanger 10 (first heat exchanger), the hot water supply burner section 11 (first combustion section) for heating the heat exchanger 10, and the water supplied from the water pipe. The main structure is composed of a water inlet pipe 12 that leads to the water heater 10 and a hot water outlet pipe 14 that guides the hot water heated in the heat exchanger 10 to the external hot water supply pipe 13. The heat exchanger 10 and the burner unit 11 are disposed in the combustion can body 7. The incoming water pipe 12 is provided with an incoming water flow sensor 15 for detecting the incoming water flow rate and an incoming water temperature sensor 16 for detecting the incoming water temperature. A hot water supply side can body hot water temperature sensor 17 that detects a hot water temperature immediately after being discharged from the heat exchanger 10 and a hot water flow rate control valve that is controlled by the heat source controller 6 to adjust the hot water flow rate. 18 (hot water limiting means) and a hot water supply temperature sensor 19 for detecting the hot water supply temperature to the hot water supply pipe 13 are provided. The detection signals of the sensors 15, 16, 17, and 19 are input to the heat source controller 6. The hot water supply flow rate control valve 18 is normally fully opened and is used by the heat source controller 6 to suppress the hot water supply flow rate when it is necessary to reduce the hot water supply flow rate.

  In addition, the water inlet pipe 12 and the hot water outlet pipe 14 are connected by a bypass pipe 20, and a distribution valve 21 that adjusts the distribution ratio of the tap water branched and flowing from the water inlet pipe 12 is connected to the bypass pipe 20. Is provided. The distribution valve 21 is controlled by the heat source device controller 6, and the temperature of the hot water supply temperature to the hot water supply pipe 13 is adjusted by the mixed water of the hot water heated by the heat exchanger 10 and the water branched and flowing into the bypass pipe 20. It is like that. The hot water temperature sensor 19 detects the hot water temperature after the temperature adjustment.

  The hot water supply burner unit 11 is divided into a plurality of combustion regions, and is divided into three combustion regions in the illustrated example. Each combustion region is composed of one or more gas burners, and a gas supply pipe 22 (fuel supply path) for supplying fuel gas from the fuel gas supply side is connected to each combustion region. . The gas supply pipe 22 is provided with an original gas solenoid valve 23 as a main plug and a gas proportional valve 24 (flow rate control valve) for adjusting the gas supply flow rate in order from the fuel gas supply source side. The gas supply pipe 22 is branched for each combustion region on the downstream side of the gas proportional valve 24 (in the illustrated example, inside the combustion can body 7), and an opening / closing valve is provided as a capacity switching valve for each branch path. Whether or not to supply the gas to each combustion region can be switched by opening and closing the corresponding capacity switching valve.

  Each of these capacity switching valves is controlled to be opened and closed by the heat source machine controller 6, and when the capacity switching valve to be opened is selectively switched by the heat source machine controller 6, N1 to N1 having different combustion capacity adjustment control ranges as shown in FIG. The hot water supply burner unit 11 is configured to be controllable to any one of the five stages of capacity stages up to N5. The adjustment control range of each capacity stage number may be appropriate. For example, in the capacity stage number N1, by controlling the opening of the gas proportional valve, the combustion capacity is adjusted to 2.5 to 5.0 in output number. Adjustment control is possible in the range, adjustment control is possible in the range from 3.5 to 7.5 for the capacity stage number N2, and adjustment control is possible in the range from 6.5 to 11 in the capacity stage number N3. In the capacity stage number N4, adjustment control is possible in the range from 8.5 to 15 and in the capacity stage number N5, adjustment control is possible in the range from 13 to 24. The hot water discharge capacity (combustion capacity) is variable in the range from the number 2.5 to the maximum output number 24. In the two capacity stages different by one stage, the combustion capacity ranges of the large combustion areas C1 to C4 of the lower capacity stage and the small combustion areas A2 to A5 of the upper capacity stage overlap (ie, C1). And A2, C2 and A3, C3 and A4, and C4 and A5 overlap each other), thereby preventing hunting for switching the number of capacity stages from the minimum (2.5) to the maximum (24) However, continuous variable control is possible substantially in a stepless manner. The relationship between the combustion capacity and the opening of the gas proportional valve in each capacity stage number N1 to N5 may be expressed by a curve as shown in FIG. Proportional relationship).

  The heat source controller 6 opens the hot water supply solenoid valve 25 of the heating terminal connected to the hot water tap 5 or the hot water supply pipe 13, so that tap water is introduced through the incoming water pipe 12, and the incoming water flow sensor 15 is set to the minimum operating water amount. When a flow rate equal to or higher than (MOQ) is detected, the hot water supply burner unit 11 is operated for combustion to start hot water supply operation control. When the hot-water tap 5 and the hot-water solenoid valve 25 are closed and the detected value of the incoming water flow rate sensor 15 is less than the minimum amount of operating water, the combustion operation of the hot-water supply burner unit 11 is stopped and the hot-water supply operation control ends.

  During the hot water supply operation control, the heat source controller 6 (combustion capacity adjustment control means) uses the hot water supply burner section so that the detected value of the hot water supply temperature sensor 19 becomes the set hot water supply temperature set by a hot water supply remote controller (not shown) or the like. 11, the hot water supply burner unit 11 is operated to burn with the combustion capacity required to set the hot water supply temperature to the set temperature. A specific control method of the hot water supply operation control is performed based on a control output number (required combustion capacity) such as an FF control number or an FB control number, and may be a conventionally known appropriate one, for example, this application It may be disclosed in Japanese Patent Application Laid-Open No. 2008-128575 by the applicant. In the example shown in FIG. 1, the maximum control opening degree of the gas proportional valve 24 at the capacity stage numbers N3 and N4 is kept relatively lower than the maximum control opening degree of the other capacity stage numbers. Where it is necessary to make the opening degree of the valve 24 (that is, the control gas pressure) proportional to the control rotational speed of the combustion fan 8, if the opening degree of the gas proportional valve 24 is maximized, the control rotational speed of the combustion fan 8 also increases. Since the noise and power consumption by the combustion fan 8 increase, the maximum control opening degree of the gas proportional valve 24 is kept low at the capacity stages N3 and N4 in order to suppress the noise and power consumption as much as possible. When it is necessary to open to the maximum opening degree of the gas proportional valve 24 in preference to suppression of noise and power consumption, it is possible to control to the maximum opening degree of the gas proportional valve 24 at each capacity stage number.

  Next, the structure of the heating system of the composite heat source machine 1 will be described. The heating system sends low-temperature water stored in the expansion tank 30 to the heating heat exchanger 32 (second heat exchanger) by the operation of the circulation pump 31, and burns the heating burner section 33 (second combustion section). After heating by heat exchange with heat to obtain high-temperature water of about 80 ° C., this high-temperature water is supplied to the external heating circulation pipe 35 via the heating forward pipe 34, It is configured to supply high temperature water to the mist unit 2 and the indoor unit 3 via. The heating burner unit 33 and the heating heat exchanger 32 are disposed in the same combustion can body 7 as the hot water supply burner unit 11 and the hot water supply heat exchanger 10.

  And the low temperature water which became low temperature by the heat radiation in the indoor unit 3 or the mist unit 2 is returned to the expansion tank 30 via the heating return pipe 36. The heating forward pipeline 34 and the heating return pipeline 36 are connected by a bypass pipeline 37, and a bypass thermal valve 38 is provided in the middle of the bypass pipeline 37. Although FIG. 2 shows only the high-temperature heating circuit, it can further include a low-temperature heating circuit for discharging low-temperature heating water having a relatively low temperature (for example, 60 ° C.). A reheating circuit branched from the pipeline 34 is further provided, and heat is exchanged between the high-temperature water flowing through the reheating circuit and the recirculation circulation conduit for circulating the bath water, thereby reheating the bathtub water. It can also be configured to do so.

  A heating-side can body hot water temperature sensor 40 for detecting a hot water temperature immediately after the hot water is discharged from the heat exchanger 32 is provided in the heating outgoing pipe 34, and a detection signal of the sensor 40 is input to the heat source controller 6. Is done.

  The heating burner section 33 is also divided into a plurality of combustion regions, similarly to the hot water supply burner portion, and is divided into two combustion regions in the illustrated example. Each combustion region of the heating burner unit 33 is also connected to the gas supply pipe 22 in parallel with each combustion region of the hot water supply burner unit 11. That is, the gas supply pipe 22 is branched into each combustion region of the heating burner 33 within the combustion can body 7, and a capacity switching valve is provided for each combustion region of the heating burner 33. . The gas proportional valve 24 is common to the hot water supply burner unit 11 and the heating burner unit 33. The capacity switching valve of the heating burner section 33 is also controlled to be opened and closed by the heat source apparatus controller 6, and the heat source apparatus controller 6 selectively switches the heating capacity switching valve to be opened. In addition, it is possible to switch and control the number of capacity stages of the heating burner section. The adjustment control range of each capacity stage may be appropriate, but, as in the hot water supply system, between two capacity stages that differ by one stage, a large combustion region with a capacity stage on the lower stage and a small combustion with a capacity stage on the upper stage It is preferable to overlap the combustion capacity range of the region.

  The heat source controller 6 starts the heating operation control by operating the heating burner 33 and operating the pump 31 when there is a predetermined heating operation request such as a heating operation switch operation or a reserved heating operation time by the user. To do. When the hot water supply system is not used, the heat source controller 6 determines the capability switching valve of the heating burner unit 33 so that the detected value of the heating side can body hot water temperature sensor 40 becomes a predetermined set temperature (for example, 80 ° C.). Then, by controlling the gas proportional valve 24, the combustion fan 8 and the bypass heat operated valve 38, the heating burner section 33 is operated to burn with the combustion capacity necessary to set the outlet temperature of the heating heat exchanger 32 to the set temperature. In addition, it is not the control based on the detection value of the heating side can body tapping temperature sensor 40, the capability switching valve of the heating burner unit 33 and the gas so that the temperature of the low temperature water in the expansion tank becomes a predetermined temperature (for example, 60 ° C.). It is also possible to control the proportional valve 24, the combustion fan 8, and the bypass thermal valve 38.

  On the other hand, when using hot water simultaneously, the heat source controller 6 is configured to give priority to hot water operation control. That is, during the simultaneous operation of hot water supply and heating, the opening degree of the gas proportional valve 24 and the rotation speed of the combustion fan 8 are determined in the hot water supply operation control. In the heating operation control, the control of the capacity switching valve of the heating burner unit 33 is mainly performed. By switching the number of capacity stages, the operation is performed so that the hot water temperature of the heating heat exchanger 32 is as close as possible to the set temperature under the control gas pressure at the opening of the gas proportional valve 24 determined by the hot water supply operation control. .

  When the mist operation is performed by the mist unit 2 and the indoor unit 3, the hot water solenoid valve 25 of the mist unit 2 is opened and hot water for mist is supplied from the hot water supply system of the composite heat source unit 1, and from the indoor unit controller 50. In response to the mist operation request (heating operation request), the heat source controller 6 starts the heating operation control, and high-temperature water is supplied from the heating system to the mist unit 2 and the indoor unit 3. In the mist unit 2, hot water for mist is heated by exchanging heat with high-temperature water supplied from the heating system in the liquid-liquid heat exchanger 41. In addition, the indoor unit 3 is configured to generate hot air heated to a predetermined temperature by heat radiation from a heat exchanger supplied with high-temperature water supplied from a heating system, and blow out into the bathroom together with mist. .

  Thus, during the mist operation, a relatively large heating capacity is required for heating the mist water and generating hot air, but the opening of the gas proportional valve 24 determined by the hot water supply operation control is relatively large. In this case, it is possible to secure sufficient heating capacity by maximizing the number of capacity stages of the heating burner section 33. However, for example, when the hot water supply operation is performed at the point P1 shown in FIG. Since the control gas pressure on the secondary side (downstream side) of the gas proportional valve 24 is also reduced, the required heating capacity can be obtained even if the capacity stage number of the heating burner section 33 is maximized. It may not be possible.

  Therefore, in the present embodiment, when the heating operation control is performed according to the mist operation request from the indoor unit controller 50 (when the combustion capability of the heating burner unit 33 is in a predetermined shortage state), the heat source controller 6 is as follows. It is comprised so that control like this may be performed.

  That is, in the heat source device controller 6, the hot water supply burner unit 11 is switched to any one of the capacity stage numbers N2 to N5 other than the minimum capacity stage number N1 by the hot water supply operation control, and the small combustion capacity region A2 in the capacity stage number. A state in which the opening degree of the gas proportional valve 24 is controlled so that the hot water supply burner unit 11 performs a combustion operation in ~ A5 (a region that overlaps the large combustion capacity region of the capacity step number one step below) is a predetermined time (for example, 5-6 minutes) When it is continued, a heating combustion capacity increase function (second combustion section combustion capacity increase function) for switching the capacity switching valve of the hot water burner section 11 so as to switch the hot water supply burner section 11 to the next lower capacity stage number It has.

  For example, when the hot water supply burner unit 11 is in a combustion operation at the point P1 of the capacity stage number N4 shown in FIG. 1, if the hot water supply burner unit 11 is switched down by the heating combustion capacity increasing function, the hot water supply operation control is performed. Thus, the opening degree of the gas proportional valve 24 is largely controlled so as to maintain the combustion capacity of the hot water supply burner section 11 before and after switching, and the combustion operation is performed at the point P2 of the capacity stage number N3. If the opening of the gas proportional valve 24 is increased, the control gas pressure supplied to the heating burner unit 33 is inevitably increased, and the combustion capacity of the heating burner unit 33 can be ensured to be large. In this state, the required heating capacity can be obtained by controlling the capacity switching valve and the bypass heat operated valve of the heating burner 33 toward the predetermined control target by the heating operation control.

  Further, in the heat source controller 6, the hot water supply burner unit 11 is switched to a predetermined capacity stage number at which the heating combustion capacity increasing function is executed, and the combustion capacity is smaller than the large combustion capacity regions C3 and C4 in the capacity stage number. (The combustion capacity of the heating burner section is in a predetermined shortage state), and the gas is operated so that the combustion operation is performed in the medium combustion capacity areas B3 and B4 having a combustion capacity larger than the small combustion capacity areas A3 and A4 in the capacity stage number. When the opening degree of the proportional valve 24 is controlled by hot water supply operation control (for example, when this state continues for several minutes), the opening degree of the hot water supply flow rate control valve 18 is controlled to be small, thereby suppressing the hot water supply flow rate. The required combustion capacity of the hot water supply burner unit 11 is reduced, and the hot water supply burner unit 11 performs a combustion operation in the small combustion capacity regions A3 and A4 of the number of capacity stages at that time by hot water supply operation control. And state.

  If the state in which the combustion operation is continued in the small combustion capacity regions A3 and A4 of the predetermined capacity stages N3 and N4 for a predetermined time by such control, the heating combustion capacity increasing function is switched to the next lower capacity stage as described above. Thus, it is possible to secure a large gas pressure supplied to the heating burner section 33 and increase the combustion capacity of the heating burner section 33. Note that the hot water supply amount control control by the hot water supply flow rate control valve 18 can be continued until the mist operation is completed, for example.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, in the above embodiment, warm water is used as a heating medium as a heating medium, but antifreeze or the like can also be used as a heating medium. The composite heat source machine 1 may be a latent heat recovery type for both the hot water supply system and the heating system. Moreover, the small combustion capacity region of each capacity stage number can be set as an area smaller than a maximum control combustion capacity of the capacity stage number one stage below by a predetermined number (for example, 0.8) or more, for example, the capacity of the above embodiment. As the small combustion capacity region of the number of stages N4, an area smaller than the number 10.2 obtained by subtracting the number 0.8 from the number 11 which is the maximum control combustion capacity of the capacity stage N3 one step below, that is, the number 8.5 to 10. The area of No. 2 can be set as a small combustion capacity area. According to this, hunting due to immediately switching to the original number of hot water supply stages by hot water supply operation control immediately after switching to the next lower capacity stage number can be prevented.

  In addition, the heating combustion capacity increasing function is configured to be executed only when the hot water supply burner unit 11 is in a combustion operation at a specific one or a plurality of capacity stages (for example, only the capacity stages N3 and N4). You can also 1 is about 190 at the maximum as the gas proportional valve control value in the normal hot water supply operation control. However, when the heating combustion capacity increasing function is executed, the maximum characteristic curve of the capacity stage N3 is shown. As shown by the imaginary line on the side, the gas proportional valve 24 can be controlled to the maximum opening (256 as the control value) at the capacity stage number N3, and in this case, the overlapping regions are respectively small in the capacity stage number N4 on the upper stage side. As the combustion capacity area A4 ′ and the large combustion capacity area C3 ′ of the lower capacity stage number N3, the execution condition determination of the heating combustion capacity increasing function is performed, and the opening degree control of the gas proportional valve 24 after switching the capacity stage number is performed. It is also possible to Further, the heating combustion capacity increasing function can be enabled / disabled by setting a dip switch.

  Moreover, in the said embodiment, although the case where there was a mist operation request | requirement from the indoor unit controller 50 was made into the execution conditions of a heating combustion capacity increase function, it is not the presence or absence of a mist operation request | requirement, but the detection of the various sensors in the composite heat source machine 1 The heating combustion capacity increasing function can be executed based only on the value and the control state. For example, the capacity stage number of the hot water supply burner unit 11 is N3 or N4, the hot water supply burner unit 11 and the heating burner unit 33 are simultaneously combusting, and the heating-side can hot water temperature (heating heating temperature) is the set temperature. (For example, 80 ° C.) −15 ° C. or less (for example, 65 ° C. or less), and the state where the combustion operation is performed in the small combustion capacity region A3 or A4 in the current capacity stage number of the hot water supply burner section 11 is continued for a predetermined time. In this case, the heating combustion capacity increasing function can be executed. In this case, the fact that the heating-side can hot water temperature is lower than the set temperature by a predetermined temperature or more is a determination factor that the combustion capability of the heating burner 33 is insufficient. The integration of the predetermined time in the above state is preferably cleared when the switching control of the number of capacity stages in the hot water supply operation control of the hot water supply burner unit 11 occurs.

  Moreover, although the example which made the 2nd combustion part the burner part for heating was shown in the said embodiment, the 2nd combustion part can also be made into the burner part for bath reheating.

N1 to N5 Number of capacity stages A1 to A5 Small combustion capacity area B1 to B5 Medium combustion capacity area C1 to C4 Large combustion capacity area 1 Combined heat source machine 6 Combustion capacity adjustment control means (heat source machine controller)
10 1st heat exchanger (heat exchanger for hot water supply)
11 1st combustion part (hot-water supply burner part)
18 Hot water limiting means (hot water flow control valve)
22 Common fuel supply path (gas supply pipe)
24 Flow control valve (Gas proportional valve)
32 2nd heat exchanger (heat exchanger for heating)
33 Second combustion section (heating burner section)

Claims (5)

A first combustion section configured to be switchable to one of a plurality of capacity stages and heating the first heat exchanger, a second combustion section heating the second heat exchanger, and first and second combustion A flow rate control valve that is provided in a common fuel supply path for the first and second combustion sections and adjusts the combustion capacity of the first and second combustion sections; In a composite heat source machine comprising a combustion capacity adjustment control means for controlling the opening of the flow control valve,
In the combustion capacity adjustment control means, the combustion capacity of the second combustion section is in a predetermined shortage state, and the first combustion section is switched to a predetermined capacity stage number other than the minimum capacity stage number among the plurality of capacity stage numbers. In addition, when the opening degree of the flow control valve is controlled so that the first combustion section performs the combustion operation in a predetermined small combustion capacity region in the capacity stage number, the first combustion section is switched to the next lower capacity stage number. A composite heat source machine having a second combustion part combustion capacity increasing function.   2. The composite heat source apparatus according to claim 1, wherein the small combustion capacity region of the predetermined capacity stage number overlaps with the large combustion capacity area of the capacity stage number one stage below the capacity stage number, and the combustion capacity The adjustment control means is configured to increase the combustion capacity of the second combustion section so that the combustion capacity of the first combustion section is maintained before and after the first combustion section is switched to the next lower capacity stage by the second combustion section combustion capacity increase function. A composite heat source machine that controls to increase the opening degree of the flow control valve after execution rather than before execution.   The combined heat source machine according to claim 1 or 2, further comprising a hot water limiting means for reducing the required combustion capacity of the first combustion section that satisfies the predetermined condition, wherein the hot water limiting means is a combustion capacity of the second combustion section. Is in a predetermined shortage state, and the opening degree of the flow control valve is controlled so that the first combustion unit performs a combustion operation with a combustion capacity larger than the small combustion capacity region in the predetermined capacity stage number, The combustion capacity adjustment control means is configured to reduce the required combustion capacity of the first combustion section so that the first combustion section is in a state of performing a combustion operation in the small combustion capacity region of the predetermined capacity stage number. A combined heat source machine.   4. The composite heat source machine according to claim 1, wherein the first combustion section is a hot water supply combustion section, and the second combustion section is a heating combustion section.   The composite heat source machine according to any one of claims 1 to 4, wherein the combustion capacity adjustment control means has a predetermined combustion capacity of the second combustion section when there is a mist operation request from an external mist system. A composite heat source machine, characterized in that it is determined to be in an insufficiency state.

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