JPH0413563Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an automatic bath device that has the functions of a water heater and a bath pot, and that automatically fills a bathtub with hot water.

(Prior Art) Conventionally, when automatically filling hot water in this type of device, when stopping the pouring at the set amount of hot water, the pouring solenoid valve was suddenly closed, resulting in water hammer. In addition, as a solution to this problem, there is a method that restricts the flow rate immediately before stopping, as shown in Japanese Utility Model Application Publication No. 61-69765, but this requires a water control valve in the drop-in line, and A means for driving the water control valve, an electric circuit for controlling the water control valve, etc. are required and are expensive.

The present invention solves the above-mentioned conventional problems, and will be described below with reference to an embodiment shown in the drawings.

(Embodiment) Reference numeral 1 denotes a main body of an automatic bath device, in which a water heater 2 and a bath pot 3 are built-in. Water inlet pipe 4 of water heater 2
A flow rate sensor 6 is provided in the outlet pipe 5, and a water flow control valve 7 is provided in the hot water outlet pipe 5 to prevent the flow rate from exceeding the hot water supply capacity. Reference numeral 8 denotes a hot water supply burner, which is equipped with a proportional valve 9 to adjust the amount of combustion according to the set temperature and flow rate. A circulation circuit 11 is formed between the bathtub 3 and the bathtub 10.
A pump 12 is interposed therein, and a hopper 14 which is open to the atmosphere is connected to the suction side of the pump 12 via a three-way valve 13. 15 is a bath burner. Reference numeral 16 denotes a branch pipe branched from the hot water tap 5, which is equipped with a drop-in solenoid valve 17, and has a ball tap 18 at the tip.
It is connected to the hopper 14 by. 1
9 and 20 are water level switches in the hopper 14;
19 detects a high water level Hi, and 20 detects a low water level Lo. Reference numeral 21 denotes a water level sensor provided in the circulation circuit 11, which detects the water level in the bathtub 10. 22 is a controller that controls the drop-in solenoid valve 17, the pump 12, the water heater 2, and the bathtub 3. 23 is a hot water heater installed in a kitchen or the like.

Next, automatic hot water supply will be explained. When the automatic hot water supply switch (not shown) is turned on, the solenoid valve 17
opens (S1/S2). Then, a water flow is generated in the water heater 2, and when it is detected by the flow rate sensor 6, the burner 8 starts combustion and hot water supply begins. The hot water flowing into the branch pipe 16 flows into the hopper 14 via the ball tap 18. At this time, the three-way valve 13 is on the circulation side (b-c open)
The hot water accumulates in the hopper 14. When the water level switch Lo20 detects the water level, the signal causes the three-way valve 13 to switch to the drop side (a-b).
At the same time, the pump 12 is turned on (S3). The hot water from the water heater 2 is then sent to the bathtub 10 by the pump 12 to fill the bathtub with hot water. During this time, the discharge amount of the pump 12 and the amount of hot water supplied are automatically balanced by the ball tap 18. When the water level in the bathtub 10 reaches the set water level, the water level sensor 21 detects this and issues an automatic hot water supply stop signal (S4). Then, the controller 22 first controls the pump 1.
2 is stopped (S5). Then, since hot water is no longer conveyed, the water level in the hopper 14 rises. When the water level rises, the ball tap 18 automatically reduces the flow rate. After a certain period of time (t1) has passed (S6), the drop-in solenoid valve 17 is closed. At this rate, Hotsupa 14
Since hot water remains inside, the pump 12 is driven again for a certain period of time (t2) to drain the inside of the hopper 14 (S8 to S10), and then automatic hot water supply ends (S11).

The timing from stopping the pump 12 in step 5 to closing the drop-in solenoid valve 17 in step 7 is determined by the water level switch as shown by the broken line.
This may be done using the Hi19 detection signal (S12), or may be done using a signal that detects that the flow rate sensor 6 has fallen below the minimum operating water amount MOQ (S13), as shown by the dashed line.

(Effects of the invention) As described above, in this invention, when automatic hot water supply is stopped, the pump is first stopped, and after the ball tap automatically throttles, the drop-in solenoid valve is closed, so there is no occurrence of water hammer. Moreover, it does not require a water control valve, its driving means, a control circuit, etc., and can be achieved with a conventional equipment configuration by only making small changes to the flowchart in the controller, resulting in an inexpensive product.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram of one embodiment of the present invention, Figure 2
The figure is a flow diagram showing the flow of control. FIG. 3 is a flow diagram showing the flow of conventional control. 2... Water heater, 3... Bath pot, 10... Bathtub,
11... Circulation circuit, 12... Pump, 14... Hopper, 16... Branch pipe, 17... Dropping solenoid valve, 18... Ball tap, 22... Controller.

Claims (1)

[Scope of utility model registration request] It has the functions of a water heater and a bath pot, and for automatic filling of the bathtub, the hot water outlet pipe of the water heater is branched, and the branch pipe is equipped with a drop-in solenoid valve and is connected to the circulation circuit of the bath. It is connected to the hopper via a ball tap, and a three-way valve is installed in the circulation circuit, one of which is connected to the hopper, and a pump is installed to suck water from the hopper. An automatic bath device characterized by being provided with a controller for controlling a valve to close.