JPH08200802A - Automatic water priming device for bath water heater - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an automatic priming device for a pump used in a bath water heater. [Structure] A bypass pipe 2 having a priming solenoid valve 24 in a three-way valve 11 in which a reheating pipe 18, a bath pouring pipe 10, and a forward pipe 13 connected to a bath are respectively connected to first to third ports.
5 is attached to communicate with the discharge side of the pump 15. At the start of operation of the pump 15, first, the pouring electromagnetic valves 7 and 9 and the priming electromagnetic valve 24 are opened to perform automatic priming, and after a lapse of a predetermined time, the pump 15 is driven and the pouring electromagnetic valves 7,
9 and the priming solenoid valve 24 are closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic priming device for a bath water heater.

[0002]

2. Description of the Related Art An example of a conventional bath water heater that mixes water with hot water of a hot water supply system and pours it into a bathtub and reheats the hot water in the bathtub to return it to the bathtub 2 shows.
The high temperature obtained by passing the feed water having a temperature of about 5 ° C. from the water supply pipe 1 through the secondary side of the heat exchanger 2 and the heat medium from the heat medium pipe 3 through the primary side of the heat exchanger 2 for heat exchange By sending water to the mixing valve 4 and mixing with the low temperature feed water, about 60
℃ hot water is made. Next, a part of the hot water that has passed through the hot water check valve 5 and a part of the water that has passed through the water amount control valve 6 are mixed to make pouring water for a bath at a temperature of about 40 ° C., and the first pouring solenoid valve 7, It is connected to the second port of the three-way valve 11 by a bath pouring pipe 10 provided with a first pouring check valve 8 and a second pouring electromagnetic valve 9. A second pouring check valve 12 is provided at this second port, and a third port of the three-way valve 11 is connected to an outflow pipe 13 connected to a bath.

The return pipe 14 from the bathtub is connected to the suction side of a pump 15 which operates during automatic bath operation, reheating, and hot water addition, and the discharge side of the pump 15 has a reheating water flow switch 16, It is connected to the first port of the three-way valve 11 by a bath heating pipe 18 provided with a heating coil 17. An additional fire check valve 19 is provided at the first port. When the pouring water is sent from the bath pouring pipe 10 to the three-way valve 11, the second pouring check valve 12 is opened, the additional heating check valve 19 is closed, and the outgoing pipe 13 from the third port is opened. When the hot water reheated from the reheating pipe 18 is sent to the three-way valve 11, the reheating check valve 19 is opened, and the second pouring check valve is opened. When 12 is closed, the hot water reheated from the third mouth is sent into the bathtub through the outflow pipe 13. Reference numeral 20 denotes a bath water level sensor, which is shown above the installation position of the pump 15.

The example shown in FIG. 2 is also shown as one for heating, which is outside the scope of the present invention. Therefore, to briefly mention about heating, heating water in the cistern tank 21 is boosted by the heating pump 22 and sent to the heating heat exchanger 23, and the heating heat exchanger 23 heats each heating tool. The heating medium for the heating heat exchanger 23 has a closed circuit configuration in which it is returned to the cistern tank 21 after being sent to the heating medium pipe 3
It is designed to be supplied by a branch pipe from.

[0005]

When the above-mentioned pump 15 is first operated, a troublesome priming work of supplying a water from the suction side of the pump 15 by applying a hose to the opening of the return pipe 14 of the bathtub. Had to do. Also, if the suction side piping of the pump is in the shape of a torii, the water that should have accumulated in the pump may escape due to the siphon action. Therefore, it was necessary to perform priming work. The problem to be solved by the present invention is to eliminate the above-mentioned inconvenience by always performing automatic priming work before operating the pump.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a hot water pouring pipe for bathing, and a hot water pump for sucking hot water from a bathtub and passing the hot water through an additional water flow switch and an additional heating coil. A pipe and a first port to which the reheating pipe is connected and which is provided with a reheating check valve, and a second port which is connected to the pouring pipe via a pouring solenoid valve and is provided with a pouring check valve. And a bypass pipe connecting the three-way valve and the discharge side of the pump, and a three-way valve having a three-way valve connected to a forward pipe connected to the bathtub. The priming solenoid valve provided in the pipe and the pouring solenoid valve and the priming solenoid valve are first opened by the operation start signal of the pump,
A control means is provided for starting the operation of the pump after a lapse of a predetermined time and for closing the pouring solenoid valve and the priming solenoid valve.

[0007]

[Function] By opening the pouring solenoid valve and the priming solenoid valve before the pump rotates, the pouring water flows from the three-way valve into the bathtub and into the bypass piping. Since the water pressure has a sufficient pressure to raise the liquid to the height of the pump discharge side, the liquid is filled from the pump discharge side to the inside of the pump and further to the pump suction side. Since the pump operation is started after the elapse of a predetermined time after the automatic priming is performed in this manner, there is no fear of idle operation. At that time, since the pouring electromagnetic valve and the priming electromagnetic valve are closed, the hot water sent from the pump is supplied to the bathtub.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The bath pouring pipe 10 is connected to the second port of the three-way valve 11, and the hot water from the bathtub is sucked by the pump 15 and passed through the additional heating water flow switch 16 and the additional heating coil 17 The pipe 18 is connected to the first port of the three-way valve 11, the forward pipe 13 connected to the bathtub is connected to the third port of the three-way valve 11, and the first port of the three-way valve 11 is added. A fire check valve 19 is provided, and a pouring check valve 12 is provided at the second port.
2 is the same as the conventional example shown in FIG. The difference is that a bypass pipe 25 having a priming solenoid valve 24 is attached to the three-way valve 11 and is connected to the discharge side of the pump 15, and the first and second injections are performed by a drive signal of the pump 15. Control for opening the hot water solenoid valves 7 and 9 and the priming solenoid valve 24, and then driving the pump 15 and closing the first and second pouring solenoid valves 7 and 9 and the priming solenoid valve 24 after a lapse of a predetermined time. Means (not shown) are provided.

Therefore, at the time of starting the operation of the pump 15 such as automatic bath operation, reheating, and hot water, first the first and second pouring electromagnetic valves 7 and 9 and the priming electromagnetic valve 24 are opened.
Hot water of the pouring system flows from the three-way valve 11 into the bathtub and also to the bypass pipe 25. Since the water pressure of this pouring system is sufficient to raise the liquid to the height of the pump discharge side, the liquid is supplied from the pump discharge side,
As time passes, fill the inside of the pump and the suction side of the pump with liquid. Pump 15 for the first time after a certain time
To start driving. At this time, the first and second pouring solenoid valves 7 and 9 and the priming solenoid valve 24 are closed, and the pump 1
All hot water from 5 will be sent to the bathtub.

In FIG. 1, the bathtub water level sensor 20 is shown below the pump 15. However, even if the water level in the bathtub is below the pump 15, the automatic priming work described above does not interfere. It means that.

[0011]

As described above, according to the present invention, the bypass pipe provided with the priming solenoid valve is connected to the conventional three-way valve and connected to the discharge side of the pump, which is a relatively simple structure.
A control means for opening the pouring electromagnetic valve and the priming electromagnetic valve first by the operation start signal of the pump, and starting the operation of the pump after a predetermined time and closing the pouring electromagnetic valve and the priming electromagnetic valve is provided. With a relatively simple electrical structure, not only can the pump be automatically primed with pouring water before it is activated to prevent the pump from running dry, but also the shape of the piping on the suction side of the pump and the bathtub The degree of freedom in determining the pump installation position for the water level can be greatly increased.

[Brief description of drawings]

FIG. 1 is a piping diagram showing an embodiment of an automatic priming device for a bath water heater according to the present invention.

FIG. 2 is a piping diagram showing an example of a conventional bath water heater.

[Explanation of symbols]

 7 1st pouring solenoid valve 8 1st pouring check valve 9 2nd pouring solenoid valve 10 Bath pouring pipe 11 Three-way valve 12 2nd pouring check valve 13 Forward pipe to bath 14 Return piping from the bathtub 15 Pump 16 Additional heating water flow switch 17 Additional heating coil 18 Additional heating piping 19 Additional heating check valve 24 Priming solenoid valve 25 Bypass piping

Claims (1)

[Claims] 1. A bath pouring pipe, a reheating pipe for sucking hot water from a bathtub by a pump and passing it through a reheating water flow switch and a reheating coil, and the reheating check valve connected to the reheating pipe. And a second port where the pouring pipe is connected via a pouring solenoid valve and a pouring check valve is provided, and a third port where a forward pipe connected to the bath is connected. In a bath water heater provided with a three-way valve having a mouth, a bypass pipe connecting the three-way valve and the discharge side of the pump, a priming solenoid valve provided in the bypass pipe, and an operation start signal of the pump First, the pouring solenoid valve and the priming solenoid valve were opened.
An automatic priming device for a bath water heater, comprising control means for starting the operation of the pump after a lapse of a predetermined time and for closing the pouring electromagnetic valve and the priming electromagnetic valve.