JPH0148467B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-can two-channel water heater with reheating or heating, and moreover, to a gas proportional water heater.

Conventionally, as this type of water heater, the one shown in FIG. 1 is known.

To explain the device shown in FIG.
3. Heat exchanger 1 and burner 1 for reheating or heating
A cistern 15 is provided between the inlet of the heat radiating section 2 and the inlet of the heat exchanger 1 in the circulation flow path 3 that connects the heat exchanger 1 for reheating or heating and the radiator 2. In addition, a pump 7 and a water flow switch 16 are provided between the outlet of the cistern 15 and the inlet of the heat exchanger 1, and an outlet temperature sensor 10 is provided near the outlet of the heat exchanger 1.
A water flow switch 16 and an outlet temperature sensor 10 are each in electrical communication with a controller 18.

The controller 18 also includes a solenoid valve 2 provided in a gas supply pipe 19 that supplies gas to the burner 14.
0, it is also connected to the proportional valve 21.

In this case, when the reheating or heating operation switch 22 is turned on, the pump 7 starts operating, and when the circulating water flows through the circulation channel 3 at a predetermined flow rate or more, the water flow switch 16 is activated and the burner 14 is turned on. When the gas is ignited, the amount of gas is calculated based on the set temperature determined by the controller 18 and the temperature of the outlet temperature sensor 10, and the signal is sent to the proportional valve 21 to determine the amount of gas.

In the conventional devices described above, not only does it take time and effort to refill the cistern with water, energy loss occurs due to heat radiation from the cistern, but also the main body becomes large due to the cistern.

Particularly, in a two-can, two-channel water heater, which has a separate hot water supply side and a reheating or heating side in one main body, the main body becomes very large, and the installation location is limited.

The present invention aims to solve the above-mentioned problems, reduce the size of the device, and eliminate the troublesome effort and energy loss of water replenishment.

The configuration of the present invention for achieving the above object is as follows:
In a gas proportional type water heater that is a can two-channel reheating or heating water heater, a circulation flow path equipped with a heat exchanger and a heat radiating section provided on the reheating or heating side is used to exchange heat with the outlet of the heat radiating section. Between the vessel entrance and
The water supply pipe on the hot water supply side is connected to the water supply pipe through a communication pipe equipped with a pressure reducing check valve, and the circulation flow path is provided with a pump, a water flow sensor, and an inlet temperature sensor between the communication pipe connection part and the heat exchanger inlet. In addition, an outlet temperature sensor is provided between the heat exchanger outlet and the heat radiation section inlet.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, reference numeral 11 denotes the main body of the device, inside which burners 13 and 14 and heat exchangers 12 and 1 for the hot water supply side and the reheating or heating side (hereinafter explained as the reheating side for convenience of explanation) and heat exchangers 12 and 1 are arranged in parallel on the left and right. It is provided.

The hot water supply side heat exchanger 12 has an inlet connected to a water supply pipe 23 that connects to a water supply source, and an outlet connected to a hot water supply pipe 24 that connects to a hot water outlet. water level sensor 25,
An inlet water temperature sensor 26 is installed in the hot water supply pipe 24, and an outlet hot water temperature sensor 27 and a water flow valve 2 are installed in order from the upstream side.
8 are provided respectively.

Further, a gas supply pipe 19 connected to a gas pipe serving as a fuel gas supply source is connected to the hot water supply side burner 13.
The gas supply pipe 19 includes solenoid valves 2 sequentially from the upstream side.
0, a governor 29, and a proportional valve 30 are provided.

The water flow sensor 25 of the water supply pipe 23, the incoming water temperature sensor 26, the outlet temperature sensor 27 of the hot water supply pipe 24, the water flow valve 28, and the gas supply pipe 19
The solenoid valve 20 and the proportional valve 30 are connected to the hot water supply side 1 of the controller 18 provided outside the device main body 11, respectively.
8a, the water amount sensor 25 detects the amount of water flowing through the water supply pipe 23 and sends a signal A.
The incoming water temperature sensor 26 detects the incoming water temperature and sends a signal B, and the outgoing hot water temperature sensor 27 detects the outgoing water temperature and sends a signal C to the hot water supply side of the controller 18.

The controller 18 is provided outside the main body 11 and has a hot water supply side control section 18a and a reheating side control section 18b, which are provided with operation switches 34 and 22, respectively. The final gas amount is determined by adding the gas amount calculated based on the outlet temperature, the set temperature, and the proportional gain to the gas amount calculated based on the set temperature set by the provided temperature setting unit 31, the inlet water temperature, the water amount, and the thermal efficiency, and then outputs a signal. D to the proportional valve 30.

The above calculation is performed using the following formula: F ₁ = (Ts - T _IN ) x Q x 100/η ...... F ₂ = α x (Ts - T _put ) x Q ...... F = F ₁ + F ₂ ... F ₁ :F Gas amount due to feed forward (Kcal/min) F ₂ : Gas amount due to feed back (Kcal/min) F: Final gas amount (Kcal/min) Q: Flow rate (/min) T _IN : Inlet water temperature (℃) T _put : Hot water temperature Ts: Set temperature (°C) η: Heat exchanger efficiency α: Proportional gain The proportional valve 30 receives the signal D and increases or decreases the amount of gas sent to the burner 13.

Further, the hot water supply side control section 18a is configured to send a signal E to the water flow valve 28 when water supply is started, when the water flow exceeds the water flow limit, and when the set temperature is set to a high temperature.

When the water flow valve 28 receives the temperature E, the water flow rate is reduced.

On the other hand, the heat exchanger 1 on the reheating side has a circulation return pipe 3a at its inlet that communicates with the outlet of the heat radiating section 2 for reheating provided in the bathtub, and a circulation return pipe 3a at its outlet that communicates with the inlet of the heat radiating section 2. The pipes 3b are connected to each other.

Therefore, the reheating side heat exchanger 1, the circulation outgoing pipe 3b,
The heat dissipation section 2 and the circulation return pipe 3a are a sealed circulation flow path 3.
Configure.

In the circulation flow path 3, a pump 7, a water flow sensor 8, and an inlet temperature sensor 9 are installed in order from the upstream side in the circulation return pipe 3a, and an outlet temperature sensor 10 in the circulation return pipe 3b.
are provided inside the device main body 11, respectively.

This circulation flow path 3 is connected to a water flow sensor 25 in a water supply pipe 23 on the hot water supply side via a communication pipe 6 equipped with a pressure reducing check valve 5 between the outlet of the heat radiating section 2 and the pump 7.
Contact the upstream side.

Water is introduced into the circulation channel 3 from the water supply pipe 23 via the communication pipe 6, and the channel 3 is filled with water.

At this time, the air present in the circulation passage 3 is discharged through an air vent valve 32 provided at a suitable location in the circulation passage 3, in the illustrated example, the circulation outgoing pipe 3a.

Moreover, the water once introduced into the circulation channel 3 is prevented from flowing back into the water supply pipe 23 by the pressure reducing check valve 5.

The pressure reducing check valve 5 opens when the water in the circulation passage 3 decreases due to evaporation or some other cause, and replenishes water from the water supply pipe 23 to the circulation passage 3 each time.

Further, the burner 14 on the reheating side has a gas supply pipe 19 that supplies gas to the burner 13 on the hot water supply side.
is branched and communicated between the governor 29 and the proportional valve 30, and a reheating side proportional valve 33 is provided downstream of the branch.

The proportional valve 33 and the pump 7,
The water amount sensor 8, the inlet temperature sensor 9, and the outlet temperature sensor 10 are each connected to the reheating side control section 18b of the controller 18. The sensor 9 detects the temperature of the circulating water at the inlet side of the heat exchanger 1 and outputs a signal G, and the outlet temperature sensor 10 detects the temperature of the circulating water at the outlet side of the heat exchanger 1 and outputs a signal H for reheating side control. 18b.

The reheating side control unit 18 controls the gas amount based on the flow rate, inlet temperature, and outlet temperature sent by signals F, G, and H, the set temperature set by the controller 18, the thermal efficiency of the heat exchanger, and the proportional gain. It is configured to perform calculations in the same manner as the hot water supply side control section 18a described above and send a signal I to the proportional valve 33.

The proportional valve 33 of course increases or decreases the amount of gas supplied to the burner 14 in accordance with the signal I.

This ensures that the circulating water is at the set temperature when it leaves the heat exchanger 1.

Furthermore, if water at the set temperature returns to the heat exchanger 1, the proportional valve 33 is throttled and combustion in the burner 14 is stopped, so that the circulating water does not become too high temperature.

Therefore, according to the gas instantaneous water heater of the present invention,
There is no need to provide a cistern in the circulation flow path provided on the reheating or heating side, and there is no need to place a cistern there.

Since the present invention has the above configuration, it has the following advantages.

(1) Since there is no cistern, heat radiation is small and energy loss is small.

(2) Since there is no cistern, the device can be made compact.

(3) Cost is reduced because there is no need to provide a cistern.

(4) When the water in the circulation flow path decreases, water is replenished directly from the water supply pipe via the pressure reducing check valve, so there is no need to go to the trouble of replenishing water unlike in models with cisterns, which saves time and effort. .

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an example of a conventional 2-can, 2-channel type gas instantaneous water heater with reheating or heating, and Fig. 2 is a schematic diagram of a gas instantaneous water heater showing an embodiment of the present invention. . DESCRIPTION OF SYMBOLS 1...Heat exchanger, 2...Heat radiation part, 3...Circulation channel, 4...Water supply pipe, 5...Reducing pressure check valve, 6...
Connecting pipe, 7...Pump, 8...Water level sensor, 9
...Inlet temperature sensor, 10...Outlet temperature sensor.

Claims (1)

[Claims] 1. In a gas proportional type water heater that is a 2-can, 2-channel type water heater with reheating or heating, the circulation channel equipped with a heat exchanger and heat radiating section provided on the reheating or heating side is used as the outlet of the heat radiating section. The water supply pipe on the hot water supply side is connected to the heat exchanger inlet via a communication pipe equipped with a pressure reducing check valve, and the circulation flow path is provided with a connection pipe between the communication pipe connection part and the heat exchanger inlet. This gas instant water heater is equipped with a pump, a water flow sensor, an inlet temperature sensor, and an outlet temperature sensor between the heat exchanger outlet and the radiator inlet.