JPH0548025Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention mainly relates to a parallel type water heater in which a plurality of existing water heaters are installed in parallel.

(Prior art) A conventional parallel water heater includes two relatively small water heaters with heat exchangers connected in parallel to each other.
It is known that the entire water heater is used as one relatively large water heater.

(Problem to be solved by the invention) However, in the above-mentioned conventional water heater, two water heaters are always used at the same time, and the minimum capacity is relatively high, resulting in a disadvantage that the usable capacity range is narrow. It was hot.

Therefore, in order to eliminate the above-mentioned inconvenience, water heater 1
It was considered that the minimum capacity could be made relatively low by making it possible to use only the stand, thereby widening the usable capacity range, but according to this, water flow switches conventionally installed in water supply channels and In addition to the water governor, a water flow sensor, a switching solenoid valve, a control valve, and an electrical board related thereto are required, resulting in an extremely complicated structure.

(Means for Solving the Problems) The present invention aims to provide a side-by-side water heater that eliminates the above-mentioned inconveniences. The pressure in the water supply channel that supplies water to the heat exchangers of both water heaters, and the hot water outlet channel that supplies hot water from the heat exchangers of both water heaters. It is characterized by the provision of a differential pressure valve that opens when the difference between the internal pressure and the water pressure exceeds the working water pressure of the heat exchanger alone in the main water heater.

(Function) The present invention is based on the above-mentioned configuration. According to this, when the parent water heater is operating, for example, the amount of hot water demanded from the hot water outlet path side that dispenses hot water from the heat exchangers of both water heaters increases, The amount of water in the water supply channel that supplies water to the water heater's heat exchanger increases, and the difference between the pressure in the water supply channel and the pressure in the hot water outlet exceeds the operating water pressure of the parent water heater's heat exchanger alone. The differential pressure valve opens for the first time, water is passed through the heat exchanger of the child water heater, and the child water heater is activated. Therefore, the capacity adjustment in a relatively low range due to the operation of one parent water heater can be changed to two parent and child water heaters. It is possible to adjust the capacity over a relatively high range by simultaneously operating the units, and it can be used in a wide range of capacities.

(Example) Next, an example of the present invention will be described based on the drawings.

In Fig. 1, A and B indicate existing relatively small-sized parent-child water heaters with equal hot water supply capacities that are installed close to each other and housed in a common outer casing. An exchanger 1, a gas burner 2 for heating the exchanger, an electromagnetic proportional valve 4 interposed in a gas supply path 3 to the gas burner 2, and a water governor interposed in a water supply path 5 of the heat exchanger 1. 6 and water flow switch 7
, a temperature sensing element 9 provided in the hot water outlet path 8 of the heat exchanger 1, and a combustion control device 10 which inputs a water flow signal from the water flow switch 7 and a hot water outlet temperature signal from the temperature sensing element 9. The opening degree of the electromagnetic proportional valve 4 is adjusted by the combustion control device 10 which receives a command signal from an external controller 11, and the combustion amount of the gas burner 2 is controlled.

Reference numeral 12 denotes a differential pressure valve installed upstream of the water governor 6 in the water supply channel 5 of the child water heater B, and a water supply channel 13 that supplies water to the heat exchangers 1, 1 of both parent and child water heaters A and B. The difference between the pressure inside the water heater A and the pressure inside the hot water outlet path 14 that discharges hot water from the heat exchangers 1 and 1 of the parent and child water heaters A and B is the operating water pressure of the heat exchanger 1 of the parent water heater A alone. In other words, when the water supply amount Q ₀ exceeds the operating water amount of the heat exchanger 1 alone, the valve opens.

In the figure, 15 indicates a tap.

In this case, for example, when water is passed through the water supply channel 13 in response to a command signal from the controller 11 in response to a request for hot water from the hot water outlet tap 15 side, the pressure _P1 in the water supply channel 13 and the pressure P in the hot water outlet channel 14 will change. ₃ is within the working water pressure range of the parent water heater A, then the differential pressure valve 1
2 remains closed, water is passed only to the heat exchanger 1 of the parent water heater A, and its gas burner 2 is controlled by the combustion control device 10 to a combustion amount corresponding to the water flow amount Q ₀ , as shown in FIG. Hot water at a desired temperature and at a desired flow rate is obtained in the hot water outlet path 14 within a relatively low capacity range X.

In addition, when water is passed through the water supply channel 13 and the difference between the pressure P ₁ in the water supply channel 13 and the pressure P ₃ in the outlet channel 14 exceeds the operating water pressure of the parent water heater A, the differential valve 1
The valve 2 is opened, water is passed through the heat exchangers 1, 1 of the parent and child water heaters A and B, and the combustion control devices 10, 10 control the combustion amount of those gas burners 2, 2 according to the water flow rate Q _0. As a result, hot water at a desired temperature and at a desired flow rate is obtained within the hot water outlet path 14 within a relatively high capacity range Y shown in FIG.

Thus, the parallel water heater described above can be used in a wide range of capacities, from a relatively low minimum capacity when the parent water heater A operates alone to a relatively high maximum capacity when the parent and child water heaters A and B operate simultaneously. .

Note that the differential pressure valve 12 is not limited to the one shown in FIG. 1, and may of course be one equipped with a bench lily or an orifice, as shown in FIG. 3, for example.

In the above embodiment, the parallel type water heater is composed of two parent and child water heaters A and B, but it may also be composed of a parent water heater and a plurality of child water heaters. , Differential pressure valve 1 with different operating pressure for each water heater
2, and when the operating pressure of the parent water heater is exceeded, a number of child water heaters corresponding to the magnitude of the pressure are operated together with the parent water heater.

By switching the set pressures of the water governors 6, 6 of the parent and child water heaters A and B between summer and winter, it is possible to cope with both summer and winter, as shown in FIG.

(Effects of the invention) As described above, according to the present invention, the differential pressure valve allows switching between the independent operation of the parent water heater and the simultaneous operation of the two parent and child water heaters. It can be used in a wider capacity range than the conventional type, which cannot be used, and requires water flow sensors, switching solenoid valves, control valves, and related electrical boards to switch between independent operation and simultaneous operation. This has the advantage that the structure is extremely simple compared to the previously considered structure.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one example of implementation of the present invention;
FIG. 2 is an explanatory diagram showing the relationship between the difference between the pressure in the water supply channel and the pressure in the hot water supply path and the amount of hot water discharged, and FIG. 3 is an explanatory diagram showing another embodiment of the present invention. A... Parent's water heater, B... Child's water heater, 1...
Heat exchanger, 5, 13... Water supply device, 12... Differential pressure valve, 14... Hot water outlet path.

Claims (1)

[Scope of utility model registration request] In a system equipped with parent and child water heaters in which heat exchangers are connected in parallel to each other, the water supply channel that supplies water to the heat exchanger of the child water heater has a water supply channel that supplies water to the heat exchanger of both water heaters. A differential pressure valve is installed that opens when the difference between the pressure from the heat exchangers of both water heaters and the pressure in the hot water outlet path that discharges hot water exceeds the operating water pressure of the parent water heater's heat exchanger alone. This side-by-side water heater is characterized by: