JPH09280646A - Control device of hot water supply heater and water volume proportional valve, and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of water hammering on both bath tub side and general water supply service in opening an on off valve in terms of a hot water supply heater which branches a hot water supply pipe into a general hot water supply pipe and a bath tub hot water supply pipe at the downstream of a heat exchanger is provided with an on off valve in the bath tub hot water supply pipe and a water volume proportional valve in the hot water supply pipe before the branch. SOLUTION: When opening an on/off valve 11 to fill hot water in a bath tub, at first, a water volume proportional valve 13 is slightly opened from the full-closed state and throttled to a half-opened state, thereby opening the on/off valve 11 in this half closed state. After the on/off valve 11 is opened, the water volume proportional valve 13 is opened up to the opening proper to hot water filling. When closing the on/off valve after the water filling is over, at first, the water volume proportional valve 13 is full-closed and then the on/off valve 11 is closed. Then, the water volume proportional valve 13 is opened to a desired opening. A practical valve opening in the half-closed state is selected from a range which does not allow water hammering to be produced in a bath supply hot water pipe 9 when the on/off valve 11 is opened based on consideration given to a practical piping layout and a main water pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for performing general hot water supply and bath hot water supply from one heat exchanger and a water pipe system similar thereto, and particularly to a water quantity proportional valve for adjusting the water supply quantity. Regarding control.

[0002]

2. Description of the Related Art FIG. 1 shows a schematic structure of a general water heater 1 of this type. As shown in the figure, a hot water supply pipe 5 is branched downstream of the heat exchanger 3 into two pipes 7 and 9 for general hot water supply and bath hot water supply. The bath hot water supply pipe 9 is provided with a bath opening / closing valve (solenoid valve) 11 for starting / stopping bath hot water supply, and the common hot water supply pipe 5 before branching has a water amount proportional valve 13 for adjusting the hot water supply amount. Equipped.

In the conventional water heater 1, when the bath opening / closing valve 11 is opened / closed for starting / stopping the bath hot water supply, the water proportion is first proportional to the water supply pipe 9 so that a water hammer is not applied to the bath hot water supply pipe 9. After the valve 13 is fully closed, the on-off valve 11 is opened / closed, and then the water amount proportional valve 13 is opened to the required opening degree.

[0004]

However, when the bath opening / closing valve 11 is opened to start hot water supply from the bath, the following problems occur. That is, when the bath opening / closing valve 11 is opened with the water amount proportional valve 13 fully closed, the original water supply pressure is cut off, and the water pressure in the general hot water supply pipe 7 is released to the bath side and disappears. Subsequently, when the water amount proportional valve 13 is opened, the high-pressure water source pressure is applied to the general hot water supply pipe 7 again, so that a shock due to a sudden pressure change, that is, a water hammer may occur near the faucet 15. This problem occurs particularly when the general hot water supply pipe 7 is installed up to a high place such as the second floor of a house, while the bath 15 is installed in a low place such as the first floor, as shown in FIG. Cheap.

Therefore, an object of the present invention is to reliably prevent water hammers on both the bath side and the general hot water supply side due to the opening operation of the bath opening / closing valve in the water heater having the above piping configuration.

[0006]

A water heater according to the present invention comprises:
It has a general hot water supply pipe branched from a common hot water supply pipe and a bath hot water supply pipe, and a common hot water supply pipe is equipped with a water quantity proportional valve, and a bath hot water supply pipe is equipped with a bath opening / closing valve. , Having a first throttling angle opened more than fully closed and a second throttling angle opened more than the first throttling angle, and when opening the bath opening / closing valve, the water volume proportional valve is set to the first throttling angle After controlling, and after opening the bath on-off valve, the water volume proportional valve
Control the aperture angle.

The first throttle angle is preferably selected from a throttle angle range in which water hammer does not occur in the bath hot water supply pipe when the bath on-off valve is opened.

According to the present invention, when the bath opening / closing valve is opened,
Since the water amount proportional valve is not fully closed but is in a slightly opened state, a certain amount of water pressure is maintained in the general hot water supply pipe. After that, when the water flow control valve is opened, a high-pressure original water supply pressure is applied to the general hot water supply pipe, but since the water pressure has been maintained to some extent up to now, the rate of pressure increase is not excessive, and therefore no water hammer occurs .

The control of the water quantity proportional valve according to the principle of the present invention is as follows.
The present invention is not limited to the above-described water heater, and can be applied to a piping system having a configuration similar to that of the water heater.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention applied to the water heater 1 shown in FIG. 1 will be described below.

The valve control according to the present invention is performed at the time of starting / stopping the operation of hot water supply / water supply to a bathtub such as so-called "hot water filling", "additional hot water", and "water supply". This control is performed by a control circuit (microcomputer) (not shown) in the water heater 1.
It is realized by the processing of. This control circuit responds to a user command from a remote controller (not shown),
In addition, in response to the state of the water flow rate and temperature in the water heater 1, the entire flow from the start to the stop of the operation of "water filling", "additional water", and "feed water" is controlled, but this whole Since various known methods can be adopted for effective control and are not directly related to the present invention, detailed description thereof is omitted in this specification.

At the start and end of the "water filling", the control circuit drives the water quantity proportional valve 13 and the bath opening / closing valve 11 according to the present invention in the procedure shown in FIGS. FIG. 4 shows a graph of changes in the opening of the water amount proportional valve 13 and the opening / closing timing of the bath opening / closing valve 11 by this control. The same applies to "additional bath" and "feed water".

As shown in FIGS. 2 and 4, when a signal for turning on the "water filling" is input from the remote controller (step S0, time t0), the control circuit first opens the water proportional valve 13 to the fully open limit position. (Step S1,
From time t0 to t1), the fully open limit position is recognized as the fully open point (diaphragm angle 0 deg) on control. Subsequently, the water amount proportional valve 13 is closed by the throttle angle of 225 deg from this fully open point (step S2, time t1 to t2). The water flow proportional valve 13 has a throttle angle of 315 deg from the fully open limit position to the fully closed limit position.
Therefore, when the throttle angle is 225 deg, the water amount proportional valve 13 is in a state of being slightly opened from all the limit positions (hereinafter, referred to as a semi-closed state). In this semi-closed state, the control circuit next opens the bath opening / closing valve 11 (step S3, time t3), and then,
The water amount proportional valve 13 is opened to a predetermined opening for filling water (step S4, times t4 to t5).

According to the above operation, when the bath opening / closing valve 11 is opened (t3), since the water amount proportional valve 13 is in the semi-closed state, the hot water immediately flows into the bath hot water supply pipe 9, but the water pressure is A considerable pressure loss is subtracted from the water supply pressure by the water amount proportional valve 13, and the pressure becomes low. Therefore, water hammer does not occur in the bath hot water supply pipe 9. At this time, the same level of water pressure is applied to the general hot water supply pipe 7. After that, when the water amount proportional valve 13 opens (t4 to t5), the water pressure applied to the general hot water supply pipe 7 increases, but since the water pressure in the semi-closed state has been applied until now, the water pressure rise is not as rapid as in the conventional case. , Water hammer does not occur.

When the set amount of hot water is supplied to the bathtub 17, the control circuit recognizes the end of the "hot water filling" as shown in FIGS. 3 and 4 (step S10, time t6), and the water amount proportional valve 1
3 is closed to the fully closed limit position (step S11, time t6 to t7). After the water volume proportional valve 13 reaches the fully closed limit position, the bath opening / closing valve 11 is opened (step S12, time t8), and then the hot water proportional valve 13 is opened to the fully open limit position (step S13, times t9 to t10).

According to the above operation, when the bath opening / closing valve 11 is closed (t8), the water quantity proportional valve 13 is fully closed to stop the water flow, so that no water hammer is generated in the bath opening / closing valve 11. After that, when the water volume proportional valve 13 opens (t9 to t10)
Since the bath opening / closing valve 11 is closed and a certain amount of water pressure is maintained in the general hot water supply pipe 7, the water pressure does not rise rapidly and the water hammer does not occur.

The throttling angle of the water amount proportional valve 13 in the semi-closed state is 225 deg. In the above description, but it should be appropriately selected according to the condition of the pipe, the characteristics of the water amount proportional valve 13, the source water pressure and the like. Is. In that case, if a relatively large opening angle is selected within a range where water hammer does not occur in the bath hot water supply pipe 9 when the bath opening / closing valve 11 is opened, the faucet 15
Highly effective in preventing water hammer.

[0018]

As described above, according to the present invention,
It is possible to prevent water hammer on both the bath side and the general hot water supply side at the start of bath water supply.

[Brief description of drawings]

FIG. 1 is a schematic piping diagram of a water heater to which the present invention can be applied.

FIG. 2 is a flow chart showing valve control at the start of filling.

FIG. 3 is a flowchart showing valve control at the time of completion of filling with water.

FIG. 4 is a time chart showing the valve operation from the start to the end of filling.

[Explanation of symbols]

 1 Hot water supply device 3 Heat exchanger 5 Hot water supply pipe 7 General hot water supply pipe 9 Bath hot water supply pipe 11 Bath on-off valve 13 Water volume proportional valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Otani 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Inventor Toru Tsuruta 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo No. Nihon Yupro Co., Ltd. (72) Inventor Shigemi Takimoto 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Prefecture Nihon Yupro Co., Ltd. (72) Inventor Yoshihiro Matsumoto 43-43, Uozakihama-cho, Higashinada-ku, Hyogo Prefecture No. 1 Nihon Yupro Co., Ltd.

Claims (6)

[Claims] 1. A water heater having a general hot water supply pipe branched from a common hot water supply pipe and a bath hot water supply pipe, wherein the common hot water supply pipe has a water amount proportional valve and the bath hot water pipe has a bath opening / closing valve, respectively. As the throttle angle of the valve, the first valve opened rather than fully closed
And a second throttle angle opened from the first throttle angle, and means for controlling the water volume proportional valve to the first throttle angle when opening the bath opening / closing valve; After the open / close valve is opened, the water proportional valve is set to the second
And a means for controlling the aperture angle of the water heater. 2. The method according to claim 1, wherein the first
Is selected from a range of throttle angles such that water hammer does not occur in the bath hot water supply pipe when the bath opening / closing valve is opened. 3. A first and a second branched from a common source water pipe.
In a control device for a water amount proportional valve in a water supply system having a water amount proportional valve in a common source water pipe and an opening / closing valve in a first water pipe, a throttle angle of the water amount proportional valve is more than a fully closed state. Also opened first
And a means for controlling the water amount proportional valve to the first throttle angle when the on-off valve is opened, and the on-off valve And a means for controlling the water amount proportional valve to the second throttle angle after the opening of the water amount proportional valve. 4. The method according to claim 3, wherein the first
Is selected from a throttle angle range in which water hammer does not occur in the first water supply pipe when the on-off valve is opened. 5. A first and a second branched from a common source water pipe.
In a method of controlling a water amount proportional valve in a water supply system having a water supply pipe, a water source proportional valve in a common source water pipe, and an opening / closing valve in a first water supply pipe, a throttle angle of the water amount proportional valve is Also opened first
And a second throttle angle opened from the first throttle angle, the process of controlling the water amount proportional valve to the first throttle angle when opening the on-off valve, and the on-off valve A step of controlling the water amount proportional valve to the second throttle angle after the opening of the water amount proportional valve. 6. The method according to claim 5, wherein the first
Is selected from a range of throttling angles such that water hammer does not occur in the first water supply pipe when the on-off valve is opened.