JPH0416111Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a gas hot water heating system that produces hot water using a gas burner and circulates the hot water for heating.

(b) Prior Art A gas hot water heating system for heating a residential building is conventionally known, which is equipped with a plurality of heat source devices each consisting of a heat exchanger through which water is circulated by a water pump and a gas burner for heating the heat exchanger. However, conventional control circuits for properly controlling multiple heat source devices have often been complex, resulting in high costs and requiring advanced technology for construction and maintenance.

(c) Purpose of the invention The object of this invention is to provide a gas hot water heating system that can suitably control a plurality of heat source devices with a relatively simple configuration.

(d) Structure of the invention The gas hot water heating system of this invention is equipped with a heat source device and a control means for controlling the heat source device, and is a hot water heating device that circulates hot water from the heat source device to a heating load via an outgoing channel and a return channel. In the apparatus, the heat source device includes a plurality of heat exchangers and a variable combustion amount burner provided in each of these heat exchangers, and the control means detects a circulating water temperature t of the incoming waterway. Comparison means for comparing the temperature detector and the circulating water temperature t detected by the temperature detector with a reference water temperature preset according to the number of burners, and with a control temperature set before the reference water temperature. (1) When the circulating water temperature t rises to the adjustment temperature during operation of the burner, the combustion amount of the burner during operation is reduced, and the circulating water temperature t further increases to the reference water temperature. (2) When the circulating water temperature t falls to the control temperature, the combustion amount of the operating burners is increased; and when the circulating water temperature t further falls to the reference water temperature, the number of operating burners is reduced. It is characterized by increasing.

The circulating water temperature t can be detected, for example, by providing a thermistor in the circulating water supply path to the load.

(E) Embodiment 1 shown in FIG. 1 is an embodiment of the gas hot water heating system of this invention. Circulating water flows from tank 2 to tank 1.
The water passes through the heat source device 3 and the second heat source device 7, and is supplied from the hot water outlet 11 to the load side. The circulating water that has returned from the load side is returned to the water tank 2 through the water inlet 12.

The first heat source device 3 includes a first water pump 4, a first heat exchanger 5, and a first gas burner 6.

The second heat source device 7 includes a second water pump 8, a second heat exchanger 9, and a second gas burner 10.

A control circuit 13 controls the water pumps 4, 8, gas burners 6, 10, etc. based on signals from a circulating water temperature detection thermistor 14 supplied to the load side.

Reference numeral 15 denotes a check valve that prevents backflow in the direction of the second water pump 8. When the water pump 8 is stopped, hot water is prevented from flowing to the second heat exchanger 9 when the first water pump 4 is in operation. This prevents head loss in the water pump 4 of No. 1 and also prevents heat radiation loss in the heat exchanger 9.

FIG. 2 is a control system diagram of the device 1 showing the control circuit 13 and its peripheral circuits in detail, FIG. 3 is a flowchart of the operation, and FIG. 4 is a heating output characteristic diagram of the device 1. The operation will be explained below with reference to FIGS. 1 to 4.

When the power switch 17 is turned on, the microcomputer 16 forming the center of the control circuit 13 turns on the relay R ₂ and closes the contact R ₂ '. As a result, the fan motor FM is energized to rotate the fan F, and the first water pump 4 is energized to cause circulating water to flow through the first heat exchanger 5. Thereupon, relay R ₁ is turned on to close contacts R ₁ ′, igniter IG is activated, and relays R ₃ and R ₅ are turned on to close their contacts R ₃ ′ and R ₅ ′. When the contact R ₃ ′ is closed, the main solenoid valve SV ₁ of the first gas burner 6
is opened, gas is supplied through the weak combustion gas passage B1, and the first gas burner 6 is ignited. When the contact R ₅ ' is closed, the second water pump 8 is energized and circulates the circulating water to the second heat exchanger 9 and the main solenoid valve of the second gas burner 10 is energized.
Since SV ₃ is opened, gas is supplied through the weak combustion gas passage B2 and the second gas burner 10 is ignited.

The flame detection sensor 1 controls the ignition of both gas burners 6 and 10.
After confirming steps 9 and 20, turn off relay R ₁ to stop the igniter IG operation, and turn off relay R ₄ and
Turn on R ₆ , close those contacts R ₄ ′ and R ₆ ′, and turn on the fire power adjustment solenoid valves of both gas burners 6 and 10.
Open SV ₂ and SV ₄ . As a result, both gas burners 6,
The thermal power of No. 10 becomes "strong", so the heating output becomes maximum, and the circulating water temperature gradually rises. This state is the state indicated by arrow a in FIG.

Thermistor 14 for detecting the temperature of circulating water supplied to the load
The output _of
℃), the firepower of both gas burners 6 and 10 is kept at "strong".

When circulating water temperature t reaches regulated water temperature τ ₂ , relay R ₄
and turn off R ₆ , solenoid valve SV ₂ for controlling firepower,
Close SV ₄ . As a result, both gas burners 6, 10
's firepower becomes "weak". This state is the state indicated by arrow b in FIG.

When the load is heavy, the circulating water temperature t is lowered by setting the thermal power of both gas burners 6 and 10 to "weak". This state is the state indicated by arrows c and d in FIG. The heating power of both gas burners 6 and 10 is kept low until the circulating water temperature t reaches a predetermined control temperature τ ₁ (for example, 67°C), and once the temperature drops to the control temperature τ ₁ , the relay is turned on again.
Turn on R ₄ and R ₆ and use the solenoid valve SV ₂ for controlling the firepower.
Open _SV4 . This state is the state indicated by arrow e in FIG. The firepower of both gas burners 6 and 10 is “strong” again.
Therefore, the state returns to the state indicated by the arrow a in FIG. 4 described above.

On the other hand, when the load is light, both gas burners 6,
Even if the heat power in step 10 is set to "weak", the circulating water temperature t still rises. This state is the state indicated by arrow f in FIG. The circulating water temperature t is a predetermined reference water temperature T ₃ (for example, 87
℃), relays R ₃ and R ₅ are turned off, main solenoid valves SV ₁ and SV ₃ are closed, and both gas burners 6,
10 and the second water pump 8 is also stopped. This state is the state indicated by arrow g in FIG.

When both gas burners 6 and 10 are stopped, the circulating water temperature t gradually decreases. This state is the state indicated by arrow h in FIG. Both gas burners 6 and 1 are closed until the circulating water temperature t reaches a predetermined reference temperature T ₂ (for example, 69°C).
0 remains stopped.

When the circulating water temperature t falls from the reference temperature _T3 to _T2 , relay _R1 is turned on, and relay _R3 is turned on. This activates the igniter IG and opens the main solenoid valve SV ₁ of the first gas burner 6, so that the first gas burner 6 is ignited. This state is the fourth
This is the state indicated by arrow i in the figure. After confirming the ignition of the first gas burner 6, relay _R1 is turned off to stop the operation of the igniter IG. Since the solenoid valve SV ₂ for adjusting the thermal power of the first gas burner 6 is still closed, the thermal power of the first gas burner 6 is "weak."

When the load is light, the circulating water temperature t increases even if the thermal power of the first gas burner 6 is "weak". This state is the state indicated by arrow j in FIG. When the circulating water temperature t rises to the reference temperature _T3 , the relay _R3 is turned off and the first gas burner 6 is stopped. This state is the state indicated by arrow k in FIG. 4, which means that the state has returned to the state indicated by arrow g in FIG. 4 described above.

On the other hand, when the load is heavy and the thermal power of the first gas burner 6 is "weak", the circulating water temperature t decreases.
This state is the state indicated by arrow l in FIG. When the circulating water temperature t falls to a predetermined adjustment temperature τ ₁ (for example, 67° C.), the relay R ₄ is turned on and the thermal power adjustment solenoid valve SV ₂ is opened. Thereby, the thermal power of the first gas burner 6 becomes "strong". This state is indicated by the arrow m in Figure 4.
It is in a state of

When the load is light, the circulating water temperature t increases by increasing the thermal power of the first gas burner 6 to "strong".
This state is the state indicated by arrows n and o in FIG. When the circulating water temperature t reaches the predetermined adjustment temperature τ ₂ , the relay
Turn off R ₄ and close solenoid valve SV ₂ for controlling firepower.
This state is the state indicated by arrow p in FIG. By closing the thermal power adjustment solenoid valve SV ₂ , the thermal power of the first gas burner 6 becomes "weak," but if the load is light, the circulating water temperature t will further rise. This state is the state indicated by arrow q in FIG. When the circulating water temperature t reaches the reference temperature _T3 , the relay _R3 is turned off and the first gas burner 6 is stopped. This state is the state indicated by the arrow k in FIG. 4 described above, that is, the state has returned to the state indicated by the arrow g in FIG. 4 described above. On the other hand, if the load is not light, the thermal power of the first gas burner 6 becomes "weak" and the circulating water temperature t decreases. This state is the state indicated by arrow r in FIG. When the circulating water temperature t falls to the predetermined adjustment temperature τ ₁ , the relay R ₄ is turned on, the heating power adjustment solenoid valve SV ₂ is opened, and the first gas burner 6 is turned on.
Return the firepower to “strong”. This means that the state has returned to the state indicated by the arrow m in FIG. 4 described above.

By the way, even if the thermal power of the first gas burner 6 is set to "high", the circulating water temperature t will still drop if the load is heavy. This state is the state indicated by arrow s in FIG. When the circulating water temperature t falls to a predetermined reference temperature T ₁ (e.g. 65°C), relays R ₁ and R ₅ are turned on,
Activate the igniter IG and the second pump 8 and open the main solenoid valve SV ₃ of the second gas burner 10. When the ignition of the second gas burner 10 is confirmed, the relay R ₁ is turned off to stop the igniter IG, and the relay R ₆ is turned on to open the solenoid valve SV ₄ for adjusting the thermal power of the second gas burner 10. As a result, both the first gas burner 6 and the second gas burner 10 have "strong" thermal power. This state is the state indicated by arrow u in FIG. 4, and then returns to the state indicated by arrow a in FIG. 4 described above.

The features of the embodiment device 1 described above can be summarized as follows.

That is, the device 1 includes two heat source devices 3 and 7.
and a control circuit 13 for them. The control circuit 13 controls the reference water temperature T ₁ (=65
℃), T ₂ (=69℃) and T ₃ (=87℃), and the circulating water temperature t detected by the thermistor 14 is T ₁
When the following conditions occur, a two-unit operation mode is set in which both heat source units 3 and 7 are operated together. Further, when the circulating water temperature t reaches _T3 , a stop mode is set in which both heat source devices 3 and 7 are stopped. Further, when the circulating water temperature t drops to _T2 , a single unit operation mode is set in which only the heat source unit 3 is operated. Note that both the two-unit operation mode and the one-unit operation mode have a state of "strong" thermal power and a state of "weak" thermal power. The control circuit 13 switches between “strong” and “weak”.
Circulating water temperature t and preset regulating water temperature τ ₁ (=67
℃) and τ ₂ (=85℃).

Other embodiments include those equipped with three or more heat source devices.

(f) Effects of the invention According to the gas hot water heating system of this invention, the number of operating burners that heat the heat exchanger is automatically increased or decreased in accordance with the heating load, and the amount of combustion of the burners during operation is reduced. Since the temperature is automatically increased or decreased according to the rise or fall of the circulating water temperature in the outgoing channel, the appropriate heating output can be obtained according to the heating load, and not only economical and efficient heating operation can be performed, but also precise output. Adjustment is now possible and comfortable hot water heating can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a configuration explanatory diagram of an embodiment of the gas hot water heating system of this invention, Fig. 2 is a control system diagram of the equipment shown in Fig. 1, and Fig. 3 is a flowchart of the equipment shown in Fig. 1. FIG. 4 is an output characteristic diagram of the device shown in FIG. 1. 1... Gas hot water heating device, 2... Circulating water tank,
3, 7... Heat source machine, 4, 8... Water pump, 5, 9
...Heat exchanger, 6,10...Gas burner, 11...
...Hot water outlet, 12...Water inlet, 13...Control circuit,
14...thermistor, 16...microcomputer.

Claims (1)

[Claims for Utility Model Registration] A hot water heating device comprising a heat source device and a control means for controlling the heat source device, and circulating hot water from the heat source device to a heating load via an outbound channel and a return channel, the heat source device comprising: It has a plurality of heat exchangers and a variable combustion amount burner provided in each of these heat exchangers, and the control means controls the circulating water temperature t of the outflow channel.
The circulating water temperature t detected by this temperature sensor is compared with a reference water temperature set in advance according to the number of burners, as well as an adjustment temperature set before this reference water temperature. (1) When the circulating water temperature t rises to the adjustment temperature during operation of the burner, the combustion amount of the burner during operation is reduced, and the circulating water temperature t further increases to the reference water temperature. (2) When the circulating water temperature t falls to the control temperature, the combustion amount of the burners in operation is increased; and when the circulating water temperature t further falls to the reference water temperature, the number of burners in operation is reduced. A gas hot water heating system characterized by increasing the number of units in operation.