JPS5885029A - Control circuit for hot water supply heater - Google Patents

Abstract

PURPOSE:To prevent sticking of a hot water circulating pump for heater which tends to occur when not in use for a long time by a method wherein the pump is forcibly operated for a predetermined time at predetermined intervals of time while it is not used for heating or each time hot water supply is made. CONSTITUTION:In a gas-fired tap controlled hot water supply heater of two- heater and two-passage type comprising a built-in pump for circulating hot water for heating and a bypass circuit located in the heater, there is provided a power supply synchronous motor 4 adapted to cyclically drive the pump 8 when a microswitch 5 connected in series with the pump 8 is switched ON and OFF. In case the built-in pump 8 is forcibly operated, for example, twice a day and the power supply synchronous motor 4 is arranged to rotate one revolution in 24 hrs, a disk 4a with projection 4c formed at two places along the circumference thereof is used. By this arrangement, the disk 4a is rotated by the motor 4, and the pump 8 is forcibly rotated only when either of the projections 4c of the disk 4a is urged against a projection 5a of the microswitch 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit used in a gas instantaneous hot water heater and a two-can, two-channel type gas instantaneous hot water heater that is equipped with a built-in pump for heating hot water circulation and an in-machine bypass circuit for heating. In order to prevent the built-in pump from sticking (pump lock), it is necessary to forcefully operate the built-in pump for a certain period of time at regular intervals, and to prevent the built-in pump from sticking in a gas instant hot water heater with a 1-can, 2-channel system. In order to prevent this, the purpose is to force the operation to run for a certain period of time every certain period of time.

In most hot water heaters of the one-can, two-channel system, the built-in pump is operated during hot water supply, as will be described later. However, some hot water heaters do not operate their built-in pumps when supplying hot water, instead heating the water indirectly using a method called the natural circulation method.

This eliminates the need for complex mechanical parts such as three-way valves and hot water supply 10-switches, reducing costs.

There are benefits in terms of services, etc.

Conventionally, two-can, two-channel type gas instantaneous hot water heaters have not been equipped with the circuit of the present invention. However, this method (2
Can 2 waterway) was adopted early on as a gas central heating system, but at that time it was still only a little popular.
Maintenance was carried out to the extent that it could be considered excessive.
Pump locks were discovered and repaired each time.

After that, the one-can, two-channel system became the mainstream for gas central heating.

This system has a built-in pump. Moreover, almost all of them are called hot water priority type, meaning that if hot water is used while heating is being used, the heating capacity will decrease or be equal to zero. On the other hand, the built-in pump operates even when only hot water is used, so even in spring, summer, and fall when heating is not required, the built-in pump operates, so it is less likely to cause sticking.

The disadvantages of the 1-can, 2-channel type gas instant hot water heater are: (a) The heating speed of hot water is slow, (no indirect heating) (
b) It is difficult to get high temperatures. (Failure of indirect heating) (c) The quality of the hot water supply is poor.

etc.

On the other hand, gas instantaneous water heaters are equipped with gas proportional valves, etc., in an effort to improve the quality of hot water.

Since hot water heaters are generally more expensive than hot water heaters, it is necessary to improve the quality of hot water supply. A two-can, two-channel system is used for the tank. Therefore, as the use of pump locks is increasing, unless small failures such as pump locks are prevented, further development cannot be expected and it will not be possible to contribute to the development of society.

You have to think that the pump will lock up if it is not used for half a year.

The present invention satisfies these demands.

In the figure, 1 is the commercial power supply, 2 is the power switch, and 3 is the
-, 4 is a power supply synchronous motor necessary for the present invention, and 6 is a contact point of a microswitch, which uses common 4 and normally open. The relationship between the power supply synchronous motor 4 and the microswitch 5 is shown in FIG.

6 is a contact circuit, which is operated by a signal from the heating control circuit 7. 8
9 is a built-in pump, and 9 is a hot water supply control circuit.

In FIG. 2, reference numeral 4 denotes a power synchronous motor, and 4a denotes a disc. The disc 4a, which has a convex portion 4c in the circumferential direction, and the power synchronous motor 4 are integrated at their shaft. 4b is a lead wire of the power synchronous motor.

5 is a microsinch, and 5b is a lead wire, which has a convex portion 5a, and when pressed, the contact is switched. Here, the power synchronous motor 4, the disk 4a, and the convex portion 4c are not one force point, but may be one or more force points, but they are the proportion of the entire circumference,
The forced operation time of the built-in pump 8 is determined.

For example, if you want to forcefully operate the built-in pump 8 twice a day, you can use a power-synchronized motor 4 that rotates once every 24 hours. If used, only one convex portion 4C is required.

Now, when the power switch 2 is turned on, the power supply synchronous motor 4 rotates, and the disc 4a fixed to its shaft also rotates, and the convex part 4c of the disc 4a pushes the convex part 5a of the micro switch 5, switching the contacts, and Switch 5 is in a closed state.

The built-in pump 8 is forcibly rotated. The time for which the convex portion 4c is forced to rotate is determined by the proportion of the entire circumference occupied by the convex portion 4c.

After a certain period of time, the convex part of the disc 4a and the convex part 6a of the microswitch lose contact, so the microswitch 6
The contact is open.

Therefore, the built-in pump 8 is released from forced operation and stops. ! When a suitable time elapses, the convex portion of the disc 4d and the convex portion 6a of the microswitch 5 come into contact, the convex portion 6a is pushed, and the built-in pump 8 is forcibly operated.

In this way, the present invention attempts to forcibly operate the built-in pump of the hot water heater.

As described above, according to the present invention, in a hot water heater having a pump, failure of the pump can be prevented by forcibly and periodically operating the pump.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control circuit for a hot water heater according to an embodiment of the present invention, and FIG. 2 is a perspective view of the main parts thereof. 4...Power synchronous motor, 4a...Disc, 4c...Convex portion of disc, 6...Micro switch, 8...・Built-in pump.

Claims (1)

[Claims] A control circuit for a hot water heater that is equipped with a circuit that forcibly operates a heating hot water circulation pump at regular intervals other than when heating is used or for a fixed period of time every time hot water is used.