JP2006038401A - Compound heat source machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain the total combustion amount of both first and second burners to be a specified combustion amount or less and to prevent inconvenience from being given to a user, in a compound heat source machine that has a first combustion section 2-1 for hot water supply and a second combustion section 2-2 for application other than the hot water supply (for example, heating) and where the sum of the maximum combustion amount of the first combustion section and the maximum combustion amount of the second combustion section exceeds a predetermined specified combustion amount (for example, 60000 kcal/h) desired as the upper limit in the case of use at home. <P>SOLUTION: In a simultaneous operation of the first combustion section 2-1 and the second combustion section 2-2, the combustion amount of the first combustion section 2-1 is controlled to match with a required combustion amount, the combustion amount of the second combustion section 2-2 is limited so that the total combustion amount of both combustion sections 2-1 and 2-2 does not exceed the specified combustion amount. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a first heat exchanger for hot water supply and a first combustion section having a first burner for heating the first heat exchanger, and a second heat exchanger and a second heat for uses other than hot water for circulating hot water. The present invention relates to a composite heat source apparatus including a second combustion unit having a second burner for heating an exchanger.

  Gas combustion equipment is divided into household gas combustion equipment and commercial gas combustion equipment according to the value of the maximum combustion amount (maximum input). When the maximum combustion amount exceeds 78000 kcal / h, it is classified as a commercial gas combustion equipment. Classified and subject to various legal restrictions. If the maximum combustion amount is 78000 kcal / h or less, it is classified into household gas combustion equipment. However, in actuality, the maximum combustion amount is 60000 kcal / It is desired to be less than h.

  Here, in a combined heat source machine including a first combustion section for hot water supply and a second combustion section for heating other than hot water supply, for example, the maximum combustion amount of the burner (first burner) of the first combustion section is 45000 kcal / h, if the maximum combustion amount of the burner (second burner) in the second combustion section is 15000 kcal / h, the total combustion amount is 60000 kcal / h even if both the first burner and the second burner are burned at the maximum combustion amount. There is no problem even if it is used at home. However, recent households have a large number of taps installed, and a large hot water supply capacity is required, and it is necessary to increase the maximum combustion amount of the first burner. When both burners are burned at the maximum combustion amount, the total combustion amount may exceed 60000 kcal / h. For example, in order to obtain the hot water supply capacity of No. 28, it is necessary to set the maximum combustion amount of the first burner for hot water supply to 52500 kcal / h, and the maximum combustion amount of the second burner for heating is set to 15000 kcal / h. In this case, if both the first burner and the second burner are burned at the maximum combustion amount, the total combustion amount becomes 67500 kcal / h, and when used at home, problems may occur due to insufficient capacity of the gas piping and gas meter. There is sex.

Therefore, conventionally, in a combined heat source machine in which the sum of the maximum combustion amount of the first burner and the maximum combustion amount of the second burner exceeds 60000 kcal / h, the first combustion unit for hot water supply and the second combustion unit for heating When the total combustion amount of both the first and second burners exceeds 60000 kcal / h during simultaneous operation, the hot water supply load is reduced by automatically reducing the amount of hot water discharged, and the first burner burns. It is known that the amount is reduced and the total combustion amount of both the first and second burners is kept at 60000 kcal / h or less (see, for example, Patent Document 1).
Japanese Patent Publication No. 8-27073 (0024, FIG. 2)

  In the above conventional example, when the total combustion amount of both the first and second burners exceeds 60000 kcal / h, the amount of hot water is reduced regardless of the user's intention, which is inconvenient for the user. Call.

  In view of the above, the present invention provides a predetermined prescribed combustion amount (for example, 60000 kcal / w) desired as an upper limit when the total combustion amount of both the first and second burners is used at home without inconvenience to the user. h) An object of the present invention is to provide a composite heat source machine that can be kept below.

  In order to solve the above-described problems, the present invention provides a first heat exchanger for hot water supply, a first combustion section having a first burner for heating the first heat exchanger, and a first use for purposes other than hot water supply for circulating hot water. A combined heat source device comprising a second heat exchanger having a second heat exchanger and a second burner for heating the second heat exchanger, the sum of the maximum combustion amount of the first burner and the maximum combustion amount of the second burner In which the combustion amount of the second burner is controlled so that the combustion amount of the first burner matches the required combustion amount during simultaneous operation of the first combustion portion and the second combustion portion. Control means is provided for limiting the amount so that the sum of the combustion amount of the first burner and the combustion amount of the second burner does not exceed the prescribed combustion amount.

  According to the above configuration, the total combustion amount of both the first and second burners during the simultaneous operation of the first combustion unit and the second combustion unit is kept below the specified combustion amount, and the specified combustion amount is 60000 kcal / h. If so, there will be no problem even if the combined heat source machine is used at home. And since the combustion amount of a 1st burner is controlled by request | requirement combustion amount (combustion amount corresponding to hot-water supply load), tapping temperature and tapping amount do not fall regardless of a user's intention, and a user feels uncomfortable. Giving is prevented. Although the combustion amount of the second burner may be reduced below the required combustion amount, the second heat exchanger circulates hot water, so that even if the combustion amount of the second burner is reduced, it will circulate. The temperature of the hot water does not decrease as much as the left, and the influence on the user is smaller than when the combustion amount of the first burner is reduced, and the combustion amount of the second burner is reduced from the required combustion amount. It is rare only when the hot water supply load becomes considerably high, and there is almost no inconvenience to the user in actual use.

  FIG. 1 shows a one-can / two-channel combined heat source machine in which a first combustion section 2-1 for hot water supply and a second combustion section 2-2 for heating are provided in a single can body 1. Yes. Both the first and second combustion sections 2-1 and 2-2 are partitioned by a partition wall 3. The first combustion section 2-1 is provided with a first burner 3-1, and a first heat exchanger 4-1 above it, and the second combustion section 2-2 includes a second burner 3-2 and A second heat exchanger 4-2 above it is provided.

  Each of the heat exchangers 4-1 and 4-2 includes a plurality of endothermic fins 4a arranged in the depth direction of the can 1 (the direction orthogonal to the plane of FIG. 1), and a meandering endothermic tube 4b penetrating the endothermic fins 4a. It consists of. Although not shown, the heat absorption pipe 4b of the first heat exchanger 4-1 is connected to an upstream water supply pipe and a downstream hot water discharge pipe, and opens the hot water tap at the downstream end of the hot water discharge pipe. When water is passed through the heat exchanger 4-1, the first burner 4-1 is ignited, and hot water at a set temperature is discharged from the hot water tap. Although not shown, the heat absorption pipe 4b of the second heat exchanger 4-2 is connected to a heating circuit (not shown) such as floor heating via an outgoing pipe and a return pipe, and the second heat is supplied to the heating circuit. Heating is performed by circulating hot water through the exchanger 4-2.

  Each of the burners 3-1 and 3-2 is configured by arranging a plurality of longitudinal unit burners 3 a in the horizontal direction in the depth direction of the can 1, and each of the unit burners 3 a has a respective burner 3-1. , 3-2 gas is supplied through each nozzle 3c provided in the gas manifold 3b. In addition, since hot water supply requires a larger heating capacity than heating, the number of unit burners 3a constituting each burner 3-1, 3-2 is larger in the first burner 3-1. And in this embodiment, the maximum combustion amount of the 1st burner 3-1 is set to 52500 kcal / h required in order to obtain the hot water supply capability of No. 28, and the maximum combustion amount of the 2nd burner 3-2 is 15000 kcal / h. set to h.

  Below the first and second combustion sections 2-1 and 2-2, there are first and second feeds partitioned by the distribution plate 5 with respect to the arrangement parts of the burners 3-1 and 3-2. Air chambers 6-1 and 6-2 are provided. And each combustion chamber 6-1 and 6-2 is connected to each supply chamber 6-1 and 6-2, and the combustion air from each combustion fan 7-1 and 7-2 is each supply chamber. 6-1 and 6-2 are supplied to the respective combustion sections 2-1 and 2-1 through a number of distribution holes 5a formed in the distribution plate 5. The combustion exhaust of each burner 3-1 and 3-2 is led to each heat exchanger 4-1 and 4-2, and after exchanging heat with each heat exchanger 4-1 and 4-2, both heat exchangers It flows to the common exhaust hood 8 on the upper side of 4-1 and 4-2, and is discharged outside through an exhaust port 8a formed in the exhaust hood 8.

  The gas supply paths 31-1 and 31-2 for the burners 3-1 and 3-2 connected to the gas manifolds 3b of the burners 3-1 and 3-2 have original valves 32-1 and 32, respectively. -2, governors 33-1 and 33-2, and proportional valves 34-1 and 34-2 are interposed. The main valves 32-1 and 32-2 and the proportional valves 34-1 and 34-2 are controlled by the controller 9 serving as a control unit together with the combustion fans 7-1 and 7-2. When the hot water tap is opened and water is passed through the first heat exchanger 4-1, the controller 9 opens the main valve 32-1 for the first burner 3-1, igniting the first burner 3-1, and hot water supply. Driving is performed. During the hot water supply operation, the controller 9 calculates the combustion amount (required combustion amount) corresponding to the hot water supply load obtained from the set hot water temperature, the temperature of water entering the first heat exchanger 4-1 and the amount of water flow, and the required combustion amount. The first combustion fan 7-1 is controlled so that the amount of combustion air corresponding to 1 is supplied to the first combustion unit 2-1, and the combustion amount of the first burner 3-1 matches the required combustion amount. Thus, the proportional valve 34-1 for the first burner 3-1 is controlled. When a heating switch (not shown) is turned on and hot water is circulated to the second heat exchanger 4-2 through the heating circuit, the controller 9 opens the main valve 32-2 for the second burner 3-2. The second burner 3-2 is ignited and the heating operation is performed. During the heating operation, the controller 9 calculates the combustion amount (required combustion amount) corresponding to the heating load, and the second amount is set so that the combustion air corresponding to the required combustion amount is supplied to the second combustion unit 2-2. While controlling the combustion fan 7-2, the proportional valve 34-2 for the second burner 3-2 is controlled so that the combustion amount of the second burner 3-2 matches the required combustion amount.

  Here, when both the first and second burners 3-1 and 3-2 are burned at the maximum combustion amount during simultaneous operation of hot water supply and heating, the total combustion amount of both the burners 3-1 and 3-2. Becomes 67500 kcal / h, exceeding the upper limit of 60000 kcal / h desired for use at home, and when used at home, there is a possibility of malfunction due to insufficient capacity of gas piping and gas meter. Therefore, in the present embodiment, the controller 9 performs the combustion amount restriction control for keeping the total combustion amount of both the burners 3-1 and 3-2 at 60000 kcal / h or less which is a predetermined specified combustion amount.

  The details of this control will be described below with reference to FIG. First, it is determined whether or not the heating operation is being performed in step S1, and if the heating operation is being performed, it is determined whether or not the hot water supply operation is being performed in step S2. Then, when the hot water supply operation is not being performed, that is, during the heating single operation, the process proceeds to step S4, and the second burner 3-3 is set so that the combustion amount GD of the second burner 3-2 matches the required combustion amount GDcmd on the heating side. 2 proportional valve 34-2 is controlled.

  When the hot water supply operation is being performed, that is, during the simultaneous operation of heating and hot water supply, the process proceeds to step S3, and the sum of the requested hot water side combustion amount GKcmd and the required heating side combustion amount GDcmd is a predetermined upper limit value YG. It is determined whether or not: The upper limit value YG is set to a value slightly lower than 60000 kcal / h, for example, 59500 kcal / h so that the total combustion amount does not exceed 60000 kcal / h even temporarily due to control response delay. Although not shown in FIG. 2, the controller 9 controls the proportional valve 34-1 for the first burner 3-1 so that the combustion amount of the first burner 3-1 matches the required combustion amount GKcmd on the hot water supply side. If GKcmd + GDcmd ≦ YG, the total combustion amount of both burners 3-1 and 3-2 is equal to or less than the upper limit value YG even if the second burner 3-2 is burned at the required combustion amount GDcmd on the heating side. become. Therefore, if GKcmd + GDcmd ≦ YG, the process proceeds to step S4 as in the case of the single heating operation, and the second burner 3- 3 so that the combustion amount GD of the second burner 3-2 matches the required combustion amount GDcmd on the heating side. 2 proportional valve 34-2 is controlled.

  On the other hand, if GKcmd + GDcmd> YG, the process proceeds to step S5, in which the second burner 3-2 is set so that the combustion amount GD of the second burner 3-2 becomes a value obtained by subtracting the required hot water-side combustion amount GKcmd from the upper limit value YG. 2 proportional valve 34-2 is controlled. In addition, the combustion state of each burner 3-1 and 3-2 shown by FIG. 1 is a state when progressing to step S5.

  According to the above control, the total combustion amount of both the first and second burners 3-1 and 3-2 is maintained at 60000 kcal / h or less even during simultaneous operation of heating and hot water supply. Further, since the combustion amount of the first burner 3-1 for hot water supply is controlled to the required combustion amount GKcmd, the hot water temperature and the hot water amount do not decrease regardless of the user's intention, and the user is uncomfortable. Is prevented. The combustion amount of the second burner 3-2 may be reduced below the required combustion amount GDcmd. However, since the second heat exchanger 4-2 circulates hot water, the second burner 3-2. Even if the combustion amount decreases, the temperature of the circulating hot water does not decrease as much as the left, the change in the heating temperature becomes slight, and the influence on the user decreases the combustion amount of the first burner 3-1 for hot water supply. Smaller than the case. Further, the amount of combustion of the second burner 3-2 is less than the required amount of combustion GDcmd only when the hot water supply load becomes considerably high, and there is almost no inconvenience to the user in actual use. .

  FIG. 3 shows a second embodiment of the composite heat source machine, and members similar to those in the first embodiment are denoted by the same reference numerals as above. The composite heat source machine of the second embodiment is a low-cost type, the partition wall 3 is omitted, and both the first and second combustion are performed from a single combustion fan 7 through a single supply chamber 6. Combustion air is supplied to the parts 2-1 and 2-2. Further, the heat absorption fins 4a and 4a of the first and second heat exchangers 4-1 and 4-2 are constituted by a common fin 40, and both the heat exchangers 4-1 and 4-2 of the common fin 40 are constituted. A notch 41 that suppresses heat conduction between the heat exchangers 4-1 and 4-2 is formed at the boundary portion. Furthermore, the main valve 32 and the governor 33 are connected to the common gas passage 31 upstream of the gas supply passage 31-1 for the first burner 3-1 and the gas supply passage 31-2 for the second burner 3-2. A proportional valve 34 is interposed. Further, the gas manifold 3b for the first burner 3-1 is divided into two parts, and the gas supply path 31-1 for the first burner 3-1 is respectively connected to each part of the gas manifold 3b divided into two parts. Similarly, the gas manifold 3b for the second burner 3-2 is divided into two parts, and the gas for the second burner 3-2 is divided into each part of the gas manifold 3b divided into two parts. The supply path 31-2 is connected via capacity switching valves 35-2 and 35-2, respectively.

  Also in the second embodiment, similarly to the first embodiment, the controller 9 performs the combustion amount restriction control for keeping the total combustion amount of both the burners 3-1 and 3-2 at 60000 kcal / h or less. Yes. The details are as shown in FIG. 4. First, it is determined whether or not the heating operation is being performed in step S11. If the heating operation is being performed, it is determined whether or not the hot water supply operation is being performed in step S12. Determine. When the hot water supply operation is not being performed, that is, during the heating single operation, the process proceeds to step S14, and the proportional valve 34 is controlled so that the combustion amount GD of the second burner 3-2 matches the required combustion amount GDcmd on the heating side. To do.

  When the hot water supply operation is being performed, that is, during the simultaneous operation of heating and hot water supply, the process proceeds to step S13, and the sum of the required hot water-side required combustion amount GKcmd and the required heating-side required combustion amount GDcmd is a predetermined upper limit value YG. It is determined whether or not (= 59500 kcal / h) or less. If GKcmd + GDcmd ≦ YG, the process proceeds to step S15, and the capacity for the second burner 3-2 so that the combustion amount GD of the second burner 3-2 is close to the required combustion amount GDcmd on the heating side. The switching valves 35-2 and 35-2 are controlled to open and close. Here, during the hot water supply operation, the proportional valve 34 is controlled so that the combustion amount of the first burner 3-1 matches the required combustion amount GKcmd on the hot water supply side, and the control of the proportional valve 34 controls the second burner 3. -2 combustion amount changes. Therefore, the combustion amount GD of the second burner 3-2 is equal to the required combustion amount in a state in which both the capacity switching valves 35-2 and 35-2 for the second burner 3-2 are opened due to an increase in the opening of the proportional valve 34. When GDcmd is greatly exceeded, one capability switching valve 35-2 for the second burner 3-2 is closed, and one of the second burner 3-2 for the second burner 3-2 is reduced by reducing the opening of the proportional valve 34. If the combustion amount GD of the second burner 3-2 is significantly lower than the required combustion amount GDcmd in the state where the capacity switching valve 35-2 is closed, the both capacity switching valves 35-2 for the second burner 3-2, 35-2 is opened.

  If GKcmd + GDcmd> YG, the process proceeds to step S16, and the one capacity switching valve 35-2 for the second burner 3-2 is closed. According to this, the combustion amount of the second burner 3-2 is less than half of the maximum combustion amount of 15000 kcal / h, and the first burner 3-1 is burned at the maximum combustion amount of 52500 kcal / h. Even so, the total combustion amount is kept below 60000 kcal / h. In addition, the combustion state of each burner 3-1 and 3-2 shown by FIG. 3 is a state when progressing to the step of S16.

  In the above embodiment, the maximum combustion amount of the first burner 3-1 is 52500 kcal / h, and the maximum combustion amount of the second burner 3-2 is 15000 kcal / h. However, the present invention is not limited to this. It is also possible to increase the maximum combustion amount of one burner 3-1 in the range of 60000 kcal / h or less, for example, 55000 kcal / h corresponding to hot water supply capacity 30. In this case, in the second embodiment, when the first burner 3-1 is burned at the maximum combustion amount during the simultaneous operation of heating and hot water supply, one capacity switching valve 35-2 for the second burner 3-2 is set. Even if the valve is closed, the total combustion amount may exceed 60000 kcal / h. In this case, both capability switching valves 35-2 and 35-2 for the second burner 3-2 are closed in step S16.

  In addition, as a home-use combined heat source machine having a sufficient capacity of gas pipes and gas meters, the total of the maximum combustion amount of the first burner 3-1 and the maximum combustion amount of the second burner 3-2 is When manufacturing a heat source machine that exceeds the upper limit of the combustion amount of 78000 kcal / h, the specified combustion amount is set to 78000 kcal / h, and the upper limit value YG is set to 78000 kcal / h or a value slightly lower than this, and the same as above Control may be performed.

  As mentioned above, although embodiment which applied this invention to the composite heat source machine which uses the 2nd combustion part 2-2 for heating was described, the composite heat source which uses the 2nd combustion part 2-2 as the combustion part for reheating of a bath The present invention can be similarly applied to a combined heat source machine in which the second combustion unit 2-2 is a combustion unit for heating and bath replenishment.

Explanatory drawing which shows the structure of 1st Embodiment of this invention heat source machine. The flowchart which shows the control for the combustion amount restriction | limiting in the thing of 1st Embodiment. Explanatory drawing which shows the structure of 2nd Embodiment of this invention heat source machine. The flowchart which shows the control for the combustion amount restriction | limiting in the thing of 2nd Embodiment.

Explanation of symbols

  2-1 ... 1st combustion part, 2-2 ... 2nd combustion part, 3-1 ... 1st burner, 3-2 ... 2nd burner, 4-1 ... 1st heat exchanger, 4-2 ... 2nd Heat exchanger, 9 ... controller (control means).

Claims (2)

Heating the first heat exchanger for hot water supply and the first combustion section having the first burner for heating the first heat exchanger, and the second heat exchanger and the second heat exchanger for uses other than hot water supply for circulating hot water A combined heat source machine comprising a second combustion section having a second burner, wherein the sum of the maximum combustion amount of the first burner and the maximum combustion amount of the second burner exceeds a predetermined specified combustion amount,
During the simultaneous operation of the first combustion section and the second combustion section, the combustion amount of the first burner is controlled so as to match the required combustion amount, and the combustion amount of the second burner is compared with the combustion amount of the first burner. A combined heat source machine comprising control means for limiting the total of the burner combustion amount so as not to exceed the prescribed combustion amount.   The combined heat source apparatus according to claim 1, wherein the specified combustion amount is 60000 kcal / h.

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