JPH02251024A - Bath hot water feeding device - Google Patents

Abstract

PURPOSE:To reduce a cost, to reduce a space, and to enable reliable bleeding of air by providing a 3-way valve which is selectively connected to an outbound pipe to an inbound pipe or a hot water feed pipe and switches a device to a circulation mode or a hot water feed mode and a control means to temporarily switch the device to the circulation mode during feed mode operation. CONSTITUTION:An outbound pipe 11 and a hot water feed pipe 6 are brought into a connection state by a 3-way valve 17 to selectively connect the outbound pipe 11 to an inbound pipe 12 or the hot water feed pipe 6 to bring a device into a hot water feed mode, and hot water in a hot water feed source 4 is fed in the hot water feed mode to a bath tub 2. Meanwhile, the outbound pipe 11 and the inbound pipe 12 are brought into a connection state by the 3-way valve 17 to bring the device into a circulation mode, and hot water in the bath tub 2 is circulated to effect heating and heat insulation by means of a heat exchanger 10. As noted above, since the circulation mode and a hot water feed mode are switched from each other through the single 3-way valve, a cost and a space can be reduced. A control means 18 inputs signals from a pressure sensor 13 and a temperature sensor 15 to compare the signals with respective set values for decision, controls the hot water feed source 4, a pump 9, the heat exchanger 10, and the 3-way valve 17 through the working of a processor, and controls bleeding air residing in the inbound pipe in a way to temporarily switch the hot water feed mode to the circulation mode during hot water feed mode operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to automation of hot water supply for a bath in a water heater.

Conventional technology This type of conventional bath water heater system connects the water heater and the bathtub with two pipes, and forms a circulation circuit with a pump and a heat exchanger to maintain and heat the bath water. I am doing it. This piping is also used to supply hot water to the bath, and hot water from the hot water supply heat source is injected into the circulation circuit, making construction easier and easier.
We tried to improve convenience. However, if air enters the circulation circuit during a trial run or after draining water to prevent freezing, the pump will trap air and the circulation flow rate will be extremely reduced. For example, if there is a large difference in height between the water heater and the bathtub, such as when a bathtub is installed on the second floor, circulation may stop.

In addition, with the type 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 appear, making it impossible to guarantee clear weather. become unable.

Therefore, in order to expel the air in the circulation circuit, as shown in FIG.
A three-way valve 7 and a three-way valve 8 are connected between the hot water supply pipe 6 that injects hot water from the hot water supply heat 1liX4 into the circulation circuit 3 via the edge cutting device 5.
When hot water is supplied, the a side of the three-way valve 7 and the b side of the three-way valve 8 are opened, and the hot water in the edge cutting device 5 flows through the hot water supply pipe 6 - three-way valve 7 - pump 9 - three-way valve 8 heat exchanger 10. -Outgoing pipe 11-Flows with bathtub 2. On the other hand, when keeping and heating the bathtub 2, open the b side of the three-way valve 7 and the b side of the three-way valve 8, and open the bathtub 2 - original pipe 12 - three-way valve 7 - pump 9 - three-way valve 8 - heat exchanger 10. - Outgoing pipe 11 - constitutes a circulation circuit that flows through the bathtub 2 and performs circulation heating. When starting the hot water supply, open the a side of the three-way valve 7 and the a side of the three-way valve 8, and let the water flow from the hot water pipe 6 to the three-way valve 7 to the pump 9 to the three-way valve 8 to the original pipe 12 to the bathtub 2, and It is configured to remove the air in the pump 9 and the pressure sensor 1.
The detection error of 3 was suppressed.

Problems to be Solved by the Invention However, the configuration described above not only requires three-way valves to be placed in two locations, but also complicates the piping, resulting in an increase in cost, space, and weight. Was.

The present invention provides such conventional a! The first objective is to provide a low-cost, space-saving bath water heater that solves the problem.

Moreover, the second purpose is to perform air removal more reliably.

Means for Solving the Problems To achieve the first object, the present invention provides a bathtub, an outgoing pipe and a master pipe connected to the bathtub, a pump connected to the outgoing pipe, and a pump connected to the outgoing pipe. A heat exchanger connected to the pipe or the main pipe, a hot water heat source, a hot water pipe for sending hot water from the hot water heat source, and a hot water pipe that selectively connects the outgoing pipe to the main pipe or the hot water pipe for circulation. mode or hot water supply mode, and energize the pump, heat exchanger, hot water supply heat source, and three-way valve? , . . . - A control means is provided for performing the cycle mode operation and the hot water supply mode operation, and for temporarily switching to the circulation mode iζ during the hot water supply mode operation.

Further, in order to achieve the second object, the present invention includes a control means for repeating control for temporarily switching to the circulation mode a plurality of times during the hot water supply mode operation.

Function The bath water heater of the present invention can be used in cases where the bath water heater is attached to the wall of the house and the bathtub is installed on the floor.
We focused on the fact that by first filling the outgoing pipe with hot water in hot water supply mode and then switching the three-way valve to the circulation side, the hot water rises to about half the height of the return pipe.

By repeating this action several times, the return pipe will be filled with hot water, ensuring that the pump is primed during circulation mode, and since the return pipe will be filled with hot water, errors in water level control will be less likely to occur. be able to.

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 through the master pipe 12.

A pump 9 and a heat exchanger 10 are connected to the outgoing pipe 11. Further, a pressure sensor 13 for detecting the water level in the bathtub 2 and a crystallinity sensor 15 for detecting the water temperature in the bathtub 2 are installed in the original tube 12. I6 is a solenoid valve that 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 the outgoing pipe 11, the original pipe 1
2 or a three-way valve selectively connected to the hot water supply pipe 6. This three-way valve I7 connects the outgoing pipe 11 and the hot water supply pipe 6 to a state called a hot water supply mode, and in this mode hot water from the hot water supply heat source 4 is sent to the bathtub 2. supply On the other hand, the outgoing pipe 11 and the original pipe 12 are connected by the direction valve 17, which is called a circulation mode, and the bathtub 2
The hot water is circulated and heated and kept warm by the heat exchanger 10. Reference numeral 18 denotes a control means, which inputs the signals from the pressure sensor 13 and the temperature sensor 5 and makes a judgment between each set value.
Due to the action of the processor, hot water is heated tX4. Pump 9. Heat exchanger 10. Controls the three-way valve 17. 19 is a connection port that connects the bathtub 2 and the raw tube 12.

The operation of this configuration will be explained based on FIGS. 2 to 5. Figure 2 shows the flow of hot water supply operation.

Steps 100 to 103 are standard hot water supply. Step 104 detects pressure inflection points. This pressure inflection point means that the detection characteristic of the pressure sensor 13 is such that there is no change in pressure from the time water enters the bathtub 2 until it reaches the connection port 19 of the raw pipe 12.
Since the pressure shows a characteristic that the pressure increases from when the water level crosses the connection port 19, it can be confirmed that the water level has reached the connection port 19. Steps 105 to 110 are circulation mode operation for expelling air in the outgoing pipe 11 and the original pipe 12. In steps 107 and 108, the pump operation is stopped and the original pipe 1 is
The air accumulated in the pipe 2 is removed by the water level difference between the outgoing pipe 11 and the original pipe 12. FIGS. 3 and 4 show the state at this time. Third
The figure assumes a state in which the original tube 12 is completely filled with air at the time when the inflection point in step 104 is detected.

FIG. 4 shows the state in which the pump operation is stopped in steps 107 and 108. As shown in the figure, the air within the rib 12 is pushed by the water pressure of the outgoing pipe 11 and expelled into the bathtub 2. The purpose of waiting T2 in this state is reached in about 30 seconds.

In step 110, the pump 9 is operated again to completely expel the air inside the rib 12. In steps 111 to 113, hot water is supplied without filling the outgoing pipe 11 in hot water supply mode operation. In steps 114 to 120, the temperature of the bathtub 2 is heated to the set temperature by the circulation mode operation.

Here, when the three-way valve 17 is rotated to the circulation side after filling the outgoing pipe 11 during the standby T2 (#10 seconds to 15 seconds) 113, the state shown in FIG. 5 changes to the state shown in FIG. 6. Now, assuming that the height of the three-way valve 17 and the bathtub is H, in FIG.
The outgoing pipe 11 and the original pipe 12 are filled with hot water for /2H. This mode is repeated in FIGS. 7 and 8, and as a result, in FIG. 8, the original pipe 12 and the outgoing pipe 11 are filled with hot water up to 3/4H.

Steps 114 to 119 show this flow. In step 116, for example, after T3'-30 seconds have elapsed, the process proceeds to the next mode. Also, in step 115, the flow S
When w is not ONL and T3-30 seconds have elapsed in the OFF state, the process returns to step 111.

FIG. 2 shows that this mode is repeated up to the fourth time. Now, when T4ζ3 minutes have passed since b in step 118, and even for the fourth time in step 119, if the flow Sw is not ONL, the process returns to step 101 again. in this way,
When the water level of the connection port 19 reaches the water level, the mode is switched to the circulation mode and the air bleed operation is performed, so that the water level can be detected accurately thereafter. In addition, since the pump is stopped at this time and the air in the original 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) Since it has a simple configuration in which circulation mode operation and hot water supply mode operation can be switched with one three-way valve, it has the effect of being low cost, space saving, and lightweight.

(2) During hot water supply mode operation, the system temporarily switches to circulation mode to expel air accumulated in the main pipe, so air can be expelled in a short time even if the pump's self-priming capacity is small.

(3) If the control of temporarily switching to circulation mode is repeated multiple times during hot water supply mode operation, even if the pump's self-priming capacity is small, the air can be reliably removed, and the water level can be controlled accordingly. become.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of a bath hot water supply system according to an embodiment of the present invention, Figure 2 is a control flow diagram of the system, Figure 3 is a piping configuration diagram of the system in hot water supply mode operation, and Figure 4 is the same diagram. Figure 5 is a diagram of the piping configuration when the pump is stopped when the equipment is in circulation mode, Figure 5 shows the piping lying down when the equipment is in hot water supply mode, Figure 6 is a diagram of the piping configuration when the equipment is in circulation mode, and Figure 7 is FIG. 8 is a diagram showing the piping configuration in the hot water supply mode mode operation of the same device, FIG. 8 is a piping configuration diagram in the circulation mode operation of the same device, and FIG. 9 is an overall configuration diagram of the bath hot water supply device in the conventional bath hot water supply device. 2...Bathtub, 4...Hot water heat source, 6...
...Hot water pipe, 9...Pump, 10...
- Heat exchanger, 11... Outgoing pipe, 12... Main pipe, 17... Three-way valve, 18... Control means. Name of agent: Patent attorney Shigetaka Awano

Claims (2)

[Claims] (1) 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, a hot water pipe that sends hot water from the hot water supply heat source, and a hot water supply pipe that connects the outgoing pipe to the return pipe. or a three-way valve selectively connected to the hot water pipe to switch to the circulation mode or the hot water supply mode, and energizing the pump, heat exchanger, hot water supply heat source, and three-way valve to perform the circulation mode operation and the hot water supply mode operation; and a control means for temporarily switching to a circulation mode during operation in the hot water supply mode. (2) The bath hot water supply device according to claim (1), further comprising a control means for repeating control for temporarily switching to the circulation mode a plurality of times during the hot water supply mode operation.