JP2006090656A - Hot water heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water heating device capable of performing excellent hot water heating even in the lowered state of the water level while obtaining an allowance period until the replenishment of circulating liquid. <P>SOLUTION: The hot water heating device is provided with a burner 2 for burning fuel; a heat exchanger 4 for heating hot water that flows inside, with combustion heat of the burner 2; a circulating pump 10 for circulating hot water after heated, to a radiator 7 to radiate heat for indoor heating, and returning hot water after heat radiation again to the heat exchanger 4; and a cistern tank 5 connected between the radiator 7 and the circulating pump 10. A water level sensor 12 for detecting the quantity of hot water is provided in the cistern tank 5, and after detecting the predetermined water level that requires water supply and informing to the effect, heating operation is stopped after the lapse of a predetermined time. An outflow port 6 communicating with the circulating pump 10 is formed on one side of a bottom part of the cistern tank 5, and an inflow pipe 9 into which hot water returned from the radiator 7 flows, is erected on the other side. Further, an inflow port 13 for discharging hot water flowing in toward the outflow port 6, is provided at an intermediate part of the inflow pipe 9. Excellent hot water heating can thereby be performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water heater that heats and circulates hot water to perform heating.

Conventionally, in this type of apparatus, a water level sensor is provided and a water level sensor is detected to detect a water level lower than a predetermined level. (For example, refer to Patent Document 1.)
Japanese Patent Laid-Open No. 11-141898

  By the way, in this conventional thing, since it is water replenishment, a water supply circuit is connected and water replenishment is performed immediately by a water replenishment alarm, but in the case of replenishment liquid containing antifreeze liquid or special chemicals, the user himself If you went to the equipment and refilled directly, or you asked a contractor to replenish the water, you immediately stopped heating with a supplementary water warning. In the meantime, heating was not possible during this time, which was a serious problem.

Therefore, it was considered that the replenishment warning was issued early and the heating was stopped with a timer that counted one week, so that there was room for replenishment of the liquid, but the following two problems were newly added. Occurred.
One is that, as described in the prior art, the inflow port of the cistern tank is open to the bottom of the tank, so that when the water level in the cistern tank is lowered, hot water returning to the tank is introduced into the inflow port. There is a problem that the timer cannot be counted accurately by repeating counting and resetting because it erupts vigorously and contacts the water level sensor.
The other is that the outlet of the cistern tank opens to the bottom of the tank in the same way, so when the water level in the cistern tank decreases, the hot water flowing out of the tank becomes a vortex at the outlet and When air enters, there is a problem that air flows and disturbs the circulation of hot water.

  The present invention focuses on this point and solves the above-mentioned problems. In particular, the structure is composed of a burner that burns fuel, a heat exchanger that heats hot water flowing inward with the combustion heat of the burner, and the post-heating A circulating pump that circulates the hot water in the radiator to dissipate heat to heat the room, return the heated hot water to the heat exchanger again, and a cistern tank connected between the radiator and the circulating pump. A water level sensor for detecting the amount of hot water is provided in the cistern tank so that the heating operation is stopped after the lapse of a predetermined time after detecting and notifying the predetermined water level that needs to be refilled. An outlet that communicates with the circulation pump is formed at one of the bottoms, and an inlet pipe through which hot water returning from the radiator flows is erected on the other side. The temperature that flows in toward Those having an inlet that release.

  According to the present invention, there is a sufficient time from the notification of refilling to the time when heating is stopped, and the replenishment of liquid can be easily performed at the convenience of the user or contractor without stopping the heating. Hot water jetting at the inflow port of the cistern tank is surely prevented, there is no worry of countering the timer count, and vortex flow at the outflow port of the cistern tank is also prevented, so there is no poor flow of hot water due to air traps , Always good hot water heating is obtained.

Next, a hot water heater according to the present invention will be described with reference to an embodiment shown in the drawings.
Reference numeral 1 denotes a hot water heater, which includes a burner 2 that burns fuel, and a heat exchanger 4 that is provided at an upper portion of a combustion cylinder 3 that covers the burner 2 and that exchanges heat with combustion gas to obtain hot water.

  Reference numeral 5 denotes an open-type cistern tank from which liquid is replenished. An outlet 6 is formed at one of the bottoms, and a radiant return pipe 8 for warm water from a radiator 7 for heating installed in the room is connected. In addition, an inflow pipe 9 through which hot water flows is provided upright at the other bottom, and a tank to the circulation pump 10 that circulates the hot water heated by the heat exchanger 4 to the radiator 7 and returns it to the heat exchanger 4 again. A return pipe 11 is connected, and a water level sensor 12 comprising two electrodes suspended from the upper part is provided inward.

  The inflow pipe 9 is closed at the top to prevent the discharge of warm water, and an inflow port 13 is formed at two locations on the outflow port 6 side and the side wall side of the cistern tank 5 in the middle portion. By discharging the warm water flowing in toward the water, the vortex generated at the outlet 6 when the water level is reduced is prevented, and the poor circulation of the warm water due to air trapping is eliminated.

  Reference numeral 14 denotes a microcomputer that constitutes a control circuit. On the output side, a circulation pump 10, a combustion fan 15 that supplies combustion air to the burner 2, an electromagnetic pump 16 that also supplies fuel to the burner 2, a supplementary water alarm lamp 17, The water level sensor 12 is connected to the timer 18 in the microcomputer 14 on the input side of the microcomputer 14, and the timer 18 detects that the water level sensor 12 is below a predetermined water level, so that the water refill warning lamp 17 is turned on. At the same time, the timer 18 counts a predetermined time, here one week (seven days), and stops the operation of the circulation pump 10, the combustion fan 15, and the electromagnetic pump 16 by counting up.

Next, the operation of this embodiment will be described.
By operating the hot water heating apparatus 1 so as to heat the room by the radiator 7 now, the burner 2 starts combustion, and the hot water flowing through the heat exchanger 4 is heated by this combustion gas, and this The heated hot water is circulated from the heat exchanger 4 to the radiator 7 by driving the circulation pump 10 to release the heat, thereby heating the room.

  Further, the hot water whose temperature has dropped due to heat radiation flows into the cistern tank 5 by driving the circulation pump 10, where the amount of expansion of the pressure is adjusted and heated again by circulation of the heat exchanger 4 through the circulation pump 10. It repeats circulation and performs good heating with warm water.

  Next, the operation after the water level sensor 12 detects a predetermined water level or lower will be described. This predetermined water level is determined in advance by a test or the like, and a water level that does not cause an empty operation even if the remaining hot water is heated for a week is set. It is what.

  Therefore, when the water level sensor 12 detects the water level below the predetermined water level, the refill water warning lamp 17 is turned on to inform that the circulating fluid needs to be replenished, and the user is convenient for one week after the notification. Sometimes it is sufficient to replenish the liquid or request a contractor, and it can be handled with sufficient margin.

  In the heating operation in a state where the amount of hot water is small, hot water is ejected at the inlet 13 of the cistern tank 5, but the inlet 13 is formed on the side wall of the inflow pipe 9 with the upper portion closed. The jetted hot water does not reach the upper water level sensor 12, and the malfunction of the timer 18 can be prevented. Also, there is a possibility that a vortex may be generated at the outlet 6 due to a decrease in the water level. Since the hot water from the inlet 13 is ejected vigorously toward the outlet 6, no vortex flow is formed directly above, and there is a poor flow of hot water due to air trapping, and good hot water heating is achieved even in a reduced water level. It can be continued.

Schematic of the hot water heater of this invention. Sectional drawing of the same cistern tank. The block diagram of the electric circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot-water heater 2 Burner 4 Heat exchanger 5 Systurn tank 6 Outlet 7 Radiator 9 Inlet pipe 10 Circulation pump 12 Water level sensor 13 Inlet 18 Timer

Claims (1)

  A burner for burning the fuel, a heat exchanger for heating the hot water flowing inward with the combustion heat of the burner, and circulating the heated hot water to the radiator to dissipate heat to heat the room, A circulation pump for returning hot water to the heat exchanger again, and a cistern tank connected between the radiator and the circulation pump, a water level sensor for detecting the amount of hot water is provided in the cistern tank, and replenishment is required. After the detection and notification of the predetermined water level, the heating operation is stopped after a predetermined time has passed, and at the bottom of the cistern tank, an outlet communicating with the circulation pump is formed, and the other Is characterized in that an inflow pipe into which warm water returning from the radiator flows is erected, and this inflow pipe is closed at the top and has an inlet that discharges the warm water flowing in toward the outlet in the middle. Hot water heating device.

Images