JPH083390B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention keeps the water amount or pressure of water at a constant value and changes the water amount or pressure to another constant value by controlling energization. The present invention relates to a water heater having a variable governor that can be used.

[Prior Art] Conventionally, there is a water heater that uses hot water heated by a heat exchanger by switching between hot water supply and hot water supply in a bath.

In this case, a water pipe that connects the heat exchanger and the hot water supply port of the bath is provided with a water shutoff valve that opens and closes the bath pipe.

The water shutoff valve is energized and controlled by the controller of the water heater,
For example, when the bath is filled with water, and when hot water other than the bath is required, energization is controlled so that the bath pipe is cut off.

[Problems to be Solved by the Invention] However, in the above-described conventional water heater, when the opening area of the water shutoff valve becomes small when the water shutoff valve is opened and closed,
There was a problem that running water noise was generated due to the water pressure applied to the stop valve.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water heater in which running noise generated when the on-off valve is opened and closed is reduced.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is provided in a water pipe connected to a water supply source and a hot water supply port, and the water pipe,
A ball valve type on-off valve that opens and closes the water pipe by controlling energization, and an energization control that is provided upstream of the on-off valve and that keeps the amount or pressure of water passing through the water pipe at a constant value. Accordingly, a variable governor capable of varying the amount of water or the water pressure of the water passing through the water pipe to another constant value, and a control circuit for performing energization control of the opening / closing valve and the variable governor, A technical means of the control circuit is to control the energization of the variable governor in advance so as to reduce the water pressure applied to the on-off valve when opening and closing the opening area of the on-off valve.

[Operation and Effect of the Invention] According to the present invention having the above-described configuration, the control circuit causes the variable governor provided upstream of the opening / closing valve to reduce the water pressure applied to the opening / closing valve in advance when opening / closing the opening area of the opening / closing valve. Energization control.

As a result, even when the opening area of the on-off valve during opening and closing is small, the water pressure on the on-off valve is small,
It is possible to reduce the running water noise generated when the on-off valve is opened and closed.

[Embodiment] Next, a water heater of the present invention will be described based on an embodiment shown in the drawings.

 FIG. 1 shows a schematic configuration diagram of a gas water heater.

The gas water heater 100 is roughly divided into a combustor 10, a gas supply pipe 20, a water pipe 30, and a control circuit 40.

The combustor 10 is composed of a combustion case 12 having a plurality of burners 11 arranged therein, and a blower 13 for supplying combustion air into the combustion case 12. Combustion case 12 by blower 13
The combustion air introduced therein is discharged from the exhaust port 14 as combustion gas after combustion.

A sparker 15 for igniting the burner 11 is provided near the burner 11 of the combustion case 12.

The gas supply pipe 20 supplies fuel gas to the nozzle 11a formed corresponding to the burner 11, and a source solenoid valve 21, a main solenoid valve 22, and a governor proportional solenoid valve 23 are sequentially provided from the upstream side. .

The source solenoid valve 21 and the main solenoid valve 22 open / close the gas supply pipe 20 by controlling energization, and are governor proportional solenoid valves.
Reference numeral 23 is for adjusting the amount of gas supplied to the nozzle 11a by changing the opening ratio according to the amount of energization.

The water pipe 30 is a supply pipe connected to a water supply source (not shown).
31, a hot water supply pipe 32 connected to the hot water supply port, and a combustion case
The heat exchanger 33 is provided inside the container 12 so that the supply pipe 31 and the hot water supply pipe 32 communicate with each other.

The hot water supply pipe 32 is provided downstream of the heat exchanger 33 in two branches, one of which is connected to a hot water supply port (not shown) of the bath as a bath pipe 32a, and the other of which is provided as a hot water supply pipe 32b. It is connected to a hot water supply port (not shown) other than the mouth.

The heat exchanger 33 exchanges heat between the heat generated by the combustion of the gas in the burner 11 and the water flowing inside to heat the water flowing inside.

The supply pipe 31 is provided with an electric water amount control device 34 (variable governor of the present invention) that controls an optimum flow rate for obtaining a set hot water temperature according to various information input to the control circuit 40. .

This electric water amount control device 34, by driving a valve body that can open and close the water passage of the supply pipe 31 by a geared motor, keeps the water amount or water pressure of the passing water at a constant value, and by energization control, It has a throttling function that can adjust the opening degree of the valve element to change the set value of water amount or water pressure to another constant value.

A water filter 35 and a water drain plug 36 are provided upstream of the electric water flow controller 34.

The bath pipe 32a is provided with a ball valve type on-off valve 37 that opens and closes the bath pipe 32a by controlling energization.

The ball valve type on-off valve 37 is a solenoid valve.
It has a valve mechanism that can adjust the opening area (valve opening) linearly instead of the ON / OFF type.

Further, an atmospheric pressure valve 38 that sucks air from the atmosphere when the pressure in the bath pipe 32a becomes negative is provided downstream of the opening / closing valve 37 of the bath pipe 32a.

As shown in FIG. 2, the control circuit 40 is composed of a microcomputer 41, a relay circuit 42, and a drive circuit 43. The control circuit 40 operates in accordance with the outputs of the controller 44 and various sensors operated by the user. , Original solenoid valve 21,
The main solenoid valve 22, the governor proportional solenoid valve 23, the blower 13, the electric water amount control device 34, and the opening / closing valve 37 are energized and controlled.

Various sensors of the control circuit 40, the flame rod 45 and the thermocouple 46 for detecting the flame of the burner 11 and the air-fuel ratio, the potentiometer 47 for detecting the opening in conjunction with the valve body of the electric water amount control device 34, Air volume detection sensor 48 for detecting the air volume of the blower 13 by the rotation speed, heat exchanger 33
Water temperature sensor 49 for detecting the water temperature flowing into the water, heat exchanger 33
Hot water temperature sensor 50 for detecting hot water temperature passing through heat exchanger 33
A water amount detection sensor 51 for detecting the amount of water flowing into the pipe, and a water flow switch 52 for closing the contact when the amount of water passing through the hot water supply pipe 32b exceeds a certain amount.

The on-off valve 37 described above is used as a hot water supply pipe by the control circuit 40.
When the amount of water passing through 32b exceeds a certain amount and the contact point of the water flow switch 52 is closed, the energization is controlled so as to shut off the bath pipe 32a. Further, when the amount of water passing through the hot water supply pipe 32b becomes a certain amount or less and the contact point of the water flow switch 52 is opened, the energization is controlled so as to open the bath pipe 32a.

The electric water flow control device 34 temporarily adjusts the opening degree of the valve body of the electric water flow control device 34 to reduce the water pressure applied to the open / close valve 37 before the operation of the open / close valve 37 which is energized by opening / closing the water flow switch 52. The energization is controlled as follows. Then, after confirming that the on-off valve 37 has operated, the energization is controlled again so that the original water pressure is restored.

Next, combustion control and water amount control by the microcomputer 41 will be briefly described.

Combustion control is performed by the user operating a currant connected to the hot water supply port, or by opening and closing the valve 37 by a hot water switch (not shown) of the controller 44 and causing a water flow in the supply pipe 31 to detect a water amount sensor. The rotating body in 51 rotates and combustion is started. This combustion amount is determined by the amount of water obtained by various sensors, the incoming water temperature, etc. so that the hot water outlet temperature set by the controller 44 is obtained, and the blower 13 supplies the burner 11 with an air amount corresponding to the determined combustion amount. The energization is controlled so that the power is supplied. Then, the governor proportional solenoid valve 23 is energized and controlled so that a gas amount corresponding to the rotation speed of the blower 13 and the flame temperature of the burner 11 can be obtained.

In the water volume control, the electric water volume control device 34 controls the optimum flow rate for obtaining the set hot water temperature on the basis of the hot water temperature, the water amount, the incoming water temperature, the heating capacity of the burner 11, and the like.

The hot water heated by the heat exchanger 33 is supplied to the hot water supply port of either the bath pipe 32a or the hot water supply pipe 32b selected by the user.

Now, when the hot water filling switch of the controller 44 is operated, the open / close valve 37 opens the bath pipe 32a when the contact point of the water flow switch 52 is opened with the currant connected to the hot water supply port of the hot water supply pipe 32b being closed. Open. As a result, the hot water heated by the heat exchanger 33 is supplied only to the hot water supply port of the bath.

At this time, before the opening / closing valve 37 opens the bath pipe 32a, the electric water flow control device 34 temporarily controls the energization so as to adjust the opening degree of the valve element to reduce the water pressure. Then open / close valve 37
After confirming that the bath pipe 32a is opened, the water pressure is controlled to be the original water pressure again.

Next, by opening the currant connected to the hot water supply port of the hot water supply pipe 32b, a water flow is generated in the hot water supply pipe 32b, and the contact point of the water flow switch 52 is closed.

Accordingly, the opening / closing valve 37 is energized so as to shut off the bath pipe 32a, and the hot water heated by the heat exchanger 33 is supplied only to the hot water supply port of the hot water supply pipe 32b.

At this time, the electric water amount control device 34 causes the opening / closing valve 37 to close the bath pipe 32a by closing the contact of the water flow switch 52.
Before shutting off the valve, adjust the opening of the valve once
It is controlled to reduce the water pressure applied to. After that, after confirming that the opening / closing valve 37 shuts off the bath pipe 32a, the water pressure is controlled to the original pressure again.

After that, the hot water heated by the heat exchanger 33 is again supplied to the hot water supply port of the bath by closing the currant connected to the hot water supply port of the hot water supply pipe 32b, and a predetermined amount of water can be filled. it can.

As described above, in this embodiment, when the opening / closing valve 37 of the ball valve type is opened / closed, the energization control of the electric water amount control device 34 is performed in advance so that the water pressure applied to the opening / closing valve 37 becomes small, thereby opening / closing at the time of opening / closing. Even when the opening area of the valve 37 becomes small, the water pressure applied to the opening / closing valve 37 is small, so that the running water noise generated when opening / closing the opening / closing valve 37 can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply system, and FIG. 2 is a schematic block diagram of a control circuit. In the figure 31 …… Supply pipe (water pipe) 32a …… Bath pipe (water pipe) 34 …… Electric water flow controller (variable governor) 37 …… Open / close valve, 40 …… Control circuit

Claims (1)

[Claims] 1. A ball valve type of (a) a water pipe connected to a water supply source and a hot water supply port, and (b) a water pipe provided on the water pipe for opening and closing the water pipe by controlling energization. An on-off valve, and (c) is provided upstream of the on-off valve to keep the amount or pressure of water passing through the water pipe at a constant value,
A variable governor capable of varying the amount or pressure of water passing through the water pipe to another constant value by controlling energization; and (d) control for performing energization control of the on-off valve and the variable governor. And a circuit, wherein the control circuit controls energization of the variable governor so as to reduce the water pressure applied to the on-off valve in advance when the on-off valve has a small opening area.