JPH01314844A - bath water heater - Google Patents

Abstract

PURPOSE:To remove the air retaining in a return tube by means of water head between a feed tube and the return tube, to prevent capacity from decreasing due to air engagement of a pump and to reduce cost and space by temporarily switching to a circulation mode during a hot water supply mode operation, and stopping the operation of the pump for a predetermined period of time. CONSTITUTION:Since the detecting characteristics of a pressure sensor 13 exhibits that its pressure is not varied until water is arrived at the connection port 19 of a return tube 12 from when the water is poured in a bathtub 2 and the pressure rises when the water surface level crosses the port 19, the arrival of the level at the port 19 can be confirmed. The operation of a pump is stopped during a circulation mode operation for removing the air in a feed tube 11 and the tube 12, and the air retained in the tube 12 is removed by means of water head between the tubes 11 and 12. When the level arrives at the port 19, it is switched to the circulation mode, and air evacuation is conducted. Thus, an accurate detection of the level can be conducted thereafter. In this case, the pump is stopped, the air of the tube 12 is removed by the hydraulic pressure of the tube 11. Accordingly, the air engagement of the pump 9 can be eliminated, and the air can be removed completely in a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to automation of bath hot water supply and bath warming in a water heater.

Conventional technology This type of conventional bath water heater is used to keep and heat bath water. They are connected by two pipes, a pump and a heat exchanger form a circulation circuit, and circulation heating is performed. The idea was to use this piping to supply hot water to the bath, with hot water from the hot water supply heat source being injected into the circulation circuit to improve workability and convenience. However, if air gets into this circulation circuit during a trial run or after draining water to prevent freezing, the pump will trap air and the circulation flow rate will decrease dramatically.For example, when installing a bathtub on the second floor, If there is a large difference in height between the water heater and the bathtub, circulation may stop.

In addition, in the type of water heater that remotely detects the water level in the bathtub by installing a pressure sensor on the circulation circuit in the water heater, if there is air in the circulation circuit, a detection error corresponding to the height will occur, and accuracy cannot be guaranteed at all. It disappears.

Therefore, in order to expel the air in the circulation circuit, as shown in FIG.
A three-way valve A7 and a three-way valve B8 are arranged between the hot water pipe 6 that injects hot water from the hot water heat source 4 into the circulation circuit 3 via the edge cutting device 5, and when hot water is being supplied, the a side of the three-way valve A7 and the three-way valve Open the b side of the valve B8, and the hot water in the edge cutting device 5 flows through the hot water supply pipe 6 - three-way valve A7 - pump 9 - three-way valve B8 - heat exchanger 10 - outgoing pipe 11 - bathtub 2
It flows. On the other hand, when keeping and heating the bathtub 2, the three-way valve A7
Open the b side of the three-way valve B8 and the b side of the three-way valve B8, and open the bathtub 2-return pipe 12-
A circulating circuit including three-way valve A7, pump 9, three-way valve B8, heat exchanger 10, outgoing pipe 11, and bathtub 2 is configured to perform circulating heating. When starting hot water supply, the a side of the three-way valve A7 and the a side of the three-way valve B8 are opened, the hot water pipe 6 - the three-way valve A7 - the pump 9 - the three-way valve B8 - the return pipe 12 - the bathtub 2 are flushed, and the water is returned. tube 1
It is configured to remove air from the inside of the pump 2, thereby suppressing air trapping of the pump 9 and detection error of the pressure sensor 13.

Problems to be Solved by the Invention However, with the above configuration, it is not only necessary to arrange three-way valves in two places, but also the piping becomes complicated.
This had the problem of increased cost, space, and weight.

The present invention solves these conventional problems and aims to provide a bath water supply device that is low cost and space saving.

Means for Solving the Problems In order to solve the above problems, the bath hot water supply device of the present invention includes a bathtub, an outgoing pipe and an echo connected to the bathtub, a pump connected to the outgoing pipe, and the outgoing pipe. Alternatively, a heat exchanger connected to the reverberation, a hot water heat source, a hot water pipe that sends hot water from the hot water heat source, and the outgoing pipe are selectively connected to the reverberation or the hot water pipe to perform a circulation mode or hot water supply. The pump, heat exchanger, hot water supply heat source, and three-way valve are energized to perform circulation mode operation and hot water supply mode operation, and also temporarily switch to circulation mode during the hot water supply mode operation. The pump also includes a control means for stopping the operation of the pump for a predetermined period of time.

According to the above-described configuration, the present invention temporarily switches to the circulation mode during the hot water supply mode transition, and at that time stops the operation of the pump for a predetermined period of time, thereby transferring the air accumulated in the reverberation pipe and the reverberation pipe. It works by displacing the water due to the water level drop and preventing the pump from reducing its capacity due to air trapping.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, 14 is the main body of the bath water heater, and the outgoing pipe 11
It communicates with the bathtub 2 by the echo 12.

A pump 9 and a heat exchanger 10 are connected to the outgoing pipe 11 . Furthermore, a pressure sensor 13 for detecting the water level in the bathtub 2 and a temperature sensor 15 for detecting the water temperature in the bathtub 2 are installed in the echo chamber 12. A solenoid valve 16 turns on and off the operation of the hot water supply heat source 4, and hot water from the hot water supply heat source 4 is supplied to the edge cutting device 5 through this solenoid valve 16. 17 is a three-way valve that selectively connects the outgoing pipe 11 with the reverberation pipe 12 or the hot water supply pipe 6;
The state in which the outgoing pipe 11 and the hot water supply pipe 6 are connected is called a hot water supply mode, and hot water from the hot water supply heat source 4 is supplied to the bathtub 2 in this mode. On the other hand, the state in which the outgoing pipe 11 and the reverberant 12 are connected by the three-way valve 17 is called a circulation mode, in which hot water in the bathtub 2 is circulated and heated and kept warm by the heat exchanger 10. Reference numeral 18 denotes a control means, which inputs signals from the pressure sensor 13 and temperature sensor 15 and makes judgments regarding each set value, and controls the hot water supply heat source 4 through the action of a processor. Pump 9. Heat exchanger 10. A three-way valve 17t'' is controlled. 19 is a connection port connecting the bathtub 2 and the reverberation 12.

The operation of the above configuration will be explained based on FIGS. 2 to 4. FIG. 2 shows a flow diagram of hot water supply operation. 100 to 103 are standard hot water supply. 104 detects a pressure inflection point.

This pressure inflection point means that the detection characteristics of the pressure sensor 13 are
There is no change in pressure from the time water enters the bathtub 2 until it reaches the connection port 19 of the echo chamber 12, and the pressure increases when the water level crosses the connection port 19.
You can confirm that the water level has reached 9. 105 to 110 operate in a circulation mode for expelling the air in the outgoing pipe 11 and the reverberating pipe 12. Among them, 107 to 108 stop the pump operation, and the air accumulated in the reverberation 12 is removed by the water level difference between the outgoing pipe 11 and the reverberation 12. FIGS. 3 and 4 show the state at this time. FIG. 3 shows a state in which air is completely trapped in the projecting pipe 12 at the time when the inflection point 104 is detected. FIG. 4 shows the state in which the pumps 107 to 108 are stopped. As shown in the figure, the air in the return pipe 12 is pushed by the water pressure of the outgoing pipe 11 and expelled into the bathtub 2. 109
- 110, the pump 9 is operated again to completely expel the air in the return pipe 12. In steps 111 to 113, hot water is supplied to the set water level in the hot water supply mode, and in steps 114 to 120, the bathtub 2 is heated to the set temperature in the circulation mode.

In this way, when the water level reaches the connection port 19, the mode is switched to the circulation mode and the air bleeding operation is performed, so that subsequent accurate water level detection is possible. In addition, since the pump is stopped at this time and the air in the projecting pipe 12 is expelled by the water pressure of the outgoing pipe 11, there is no air trapping in the pump 9, and the air purge operation can be completed in a short time.

Effects of the Invention As described above, the bath water supply device of the present invention provides the following effects.

(1) Low cost due to the simple design of switching between circulation mode operation and hot water supply mode operation with a three-way valve.

This has the effect of saving space and being lightweight.

(2) Temporarily switch to circulation mode operation during hot water supply mode operation, at which time pump operation is stopped for a predetermined period of time, and the pump capacity is reduced in order to expel the air accumulated in the projecting pipe by using the water level drop between the outgoing pipe and the projecting pipe. Air can be removed in a short time without dropping it.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a bath water heater according to an embodiment of the present invention, Fig. 2 is a control flow diagram of the equipment, Fig. 3 is a piping configuration diagram of the equipment in hot water supply mode operation, and Fig. 4 is the same. FIG. 5 is a diagram of the piping configuration when the pump operation is stopped during circulation mode operation of the device, and FIG. 5 is an overall configuration diagram of the bath water supply device in the conventional bath water supply device. 2... Bathtub, 4... Hot water supply heat source, 6... Hot water supply pipe, 9
... Pump, 10... Heat exchanger, 11... Outgoing pipe,
12... Projection pipe, 17... Three-way valve, 18... Control means. Name of agent: Patent attorney Toshio Nakao, 1 person, 3 salaries
1% pipe t7-three-way valve Fig. 2

Claims (1)

[Claims] A bathtub, an outgoing pipe and a return pipe connected to the bathtub, a pump connected to the outgoing pipe, a heat exchanger connected to the outgoing pipe or the return pipe, a hot water supply heat source, and from the hot water supply heat source a hot water pipe that sends out hot water; a three-way valve that selectively connects the outgoing pipe to the return pipe or the hot water pipe to switch to a circulation mode or a hot water supply mode; and the pump, heat exchanger,
a control means that energizes a hot water supply heat source and a three-way valve to perform a circulation mode operation and a hot water supply mode operation, and temporarily switches to a circulation mode during the hot water supply mode operation, and at that time stops operation of the pump for a predetermined period of time; Bath water heater with.