JPH03194328A - Controller for hot water supply equipment - Google Patents

Abstract

PURPOSE:To carry out optimum hot water supply operation as required by switching over a water flow control valve to high flow rate mode under control when only the other faucet switch is turned on and both the other faucet switch and an automatic hot water supply solenoid valve are turned on due to hot water consumption in a kitchen or shower. CONSTITUTION:When a controller 34 is used as a water quantity control switch over means, and only the other faucet switch 46 to operate during hot water consumption of hot water in a kitchen or a shower, is turned on, and when both the other faucet switch 46 and an automatic hot water supply solenoid valve 7 to a batch tub 21 are turned on, the flow rate available when a water quantity control valve 5 is full open, will be switched over to low flow rate mode under control. Therefore, this construction makes it possible to supply an optimum quantity of hot water as required, inhibit the velocity in a batch tub forward pipe 19 and a batch tub return pipe, and prevent the generation of erosion as well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control device for a water heater that automatically fills a bathtub or the like with hot water.

BACKGROUND OF THE INVENTION Conventionally, this type of bathtub with water heater has adopted a configuration as shown in FIG. 6, for example.

To explain the details, 1 is a bath pot with a water heater, and it has a built-in heat exchanger 2 for hot water supply and a heat exchanger 18 for recharging the bath, and is used for supplying hot water to the kitchen and shower, and for recharging the bath. be done. First, I will explain the water supply side. When water is led to the bathtub l with water heater by the water supply pipe 3 connected to the water pipe, it is branched and one end is led to the water flow sensor 4 and the hot water heat exchanger 2, and the other end is led to the bypass valve 26. After being guided to the hot water supply pipe 6, the hot water is combined with the hot water heated by the heat exchanger 2 for hot water supply, flows through the hot water supply pipe 6, and reaches the water volume proportional valve 5 provided at the end of the hot water supply pipe 6.

Then, the hot water is supplied to the hot water pipe B connected to the automatic hot water supply solenoid valve 7.
- 8 and a hot water supply pipe A/10 which is led to a hot water tap 9 installed in the kitchen etc. at a branch point 1].

There is an automatic hot water supply solenoid valve 7 at the end of the hot water supply pipe B.
The circuit passes through a check valve 27, a vacuum breaker 28, a second check valve 29, and then branches at a bath circuit branch 36, with a two-way valve 31 connected to one end. The two-way valve 31 has a ball valve (not shown) inside thereof, and the ball valve is rotated by a motor 32. two-way valve 3
1 can be closed for 1 period by rotating the ball valve.

Now, when trying to supply hot water to the bathtub 2I, if the two-way valve 31 is set to "closed", the hot water passes through the flow switch 30 and the bath heat exchanger 18, passes through the bath pipe 19, and passes through the bath adapter 20. and is guided to the bathtub 21.

Reference numeral 34 denotes a controller for the bathtub 1 with water heater, which has an automatic refueling sequence to be described later, and executes the sequence together with the remote controller 32. 35 is an automatic hot water supply switch that automatically controls the bath pot l with water heater. 37 is an operation switch. 38
is a power outlet.

The automatic hot water supply sequence is shown in Figures 6, 7, and 8.

This will be explained based on FIG. 9. Here, when it is confirmed that both the water amount sensor 4 and the flow switch 30 are "ON" L and water is flowing, the process moves to the next sequence. but,
At this point, the automatic hot water supply solenoid valve 7 is opened for a predetermined period of time T.
, (for example, within 10 seconds) the water level sensor 4 and flow switch 30 are turned ON.

If not, display an error message 33 using a number (for example, 53) on the remote control 32 (for example, a bath remote control), and close the solenoid valve 7 for automatic hot water supply to close the bath pipe 1.
A bath pipe occlusion determining unit 40 is provided to detect an abnormality when the pipe 9 is blocked due to freezing.

Subsequently, when it is confirmed that there is no blockage in the bath pipe 19 or the like, automatic hot water supply through the bath pipe 19 continues as it is.

At this time, the two-way valve 31 is closed and the water level sensor 2
3, the water level in the bathtub 21 can be detected.

The water level in the bathtub 21 is lower than the bath return pipe 2 of the bath adapter 20.
When reaching point 2, the output of the water level sensor 23 starts to rise, so for example 10 bits (approximately 2.5c+e at water level)
A bathtub water inflection point determining section 42 is provided which determines the point at which the water rises as an inflection point.

Furthermore, an additional drop of 10 bits (approximately 2.5c at water level)
After performing m), the two-way valve 31 is opened for a predetermined time Ts (for example, 30 seconds), and the bath is conveyed again through both the bath-going pipe 19 and the bath-returning pipe 22 to remove the air inside the pipes.

After that, the magnetic valve 7 for automatic hot water supply is closed, the circulation pump 17 is turned on, a circulating water check is performed, and the air in the pipes is completely removed.

At this time, the flow switch 30 is turned "ON". After this, while the two-way valve 31 is closed, the circulation pump 17 is turned on.
After setting it to OFFJ, turn the automatic hot water supply solenoid valve 7 to “O” again.
A bathtub water level reference point determination unit 43 is provided which uses the water level after a predetermined time T (for example, 20 seconds) as a reference value. This reference point is stored in the bathtub water level reference point storage section 45.

In addition, 1 is added to the cumulative memorized flow rate from the standard price to the set water level.
By conveying a flow rate multiplied by a smaller coefficient (for example, 0.8) through both the bath-going pipe and the bath-returning pipe, the automatic hot water supply time can be shortened by the increased amount conveyed9. When the flow is 16.81/stn in the pipe, if you also convey it in the bath return pipe and convey it in both, it will flow at 241/s+in, which is -#1.43. That is, 43% flow rate is 16.
8. Automatic hot water supply time will be shortened by the amount increased.

The accumulated memorized flow rate referred to here is the amount of water poured into the bathtub from the reference point to the set water level during the trial run, which is accumulated by the water flow sensor 4. In the conventional example, the flow rate flowing through the bypass valve 26: the flow rate flowing through the water flow sensor = 4:6
If this is set, the amount dropped into the bathtub is expressed by the following equation.

The amount poured into the bathtub from this reference point to the set water level,
This is stored in the cumulative drop amount storage section 44.

Furthermore, for example, 80% from the reference value to the set water level.
After water is conveyed through both the bath-going pipe and the bath-returning pipe, hot water is supplied to the set water level using only the bath-going pipe, and during that time, water is automatically supplied to the set water level while checking the water level with a water level sensor installed in the bath return pipe. be. In addition, when the set water level is reached,
After checking the circulating water by turning on the circulation pump 17 while setting the automatic hot water supply solenoid valve 7 to ``Closed'' and the two-way valve 31 to 1'', if the bath water is lower than the set temperature. , chase (bath heat exchanger 18 - bath pipe 19 -
The bathtub water is circulated and heated through the bathtub 21 - bath return pipe 22 - water level sensor 23 - circulation pump 17 - two-way valve 31 - bath heat exchanger 18. ) and boil to the set temperature.

Problems to be Solved by the Invention In recent years, with the trend toward two-family homes, larger bathtubs, and the spread of hot water showers, the capacity of bathtubs with water heaters, especially heat exchange heaters and burners for hot water supply, has increased. , conventional 1
Devices with an output of 24,000 kcal/h, commonly referred to as No. 6, have been increasing in size to devices with an output of 36,000 kcal/h, commonly known as No. 24. And this trend is
More is in progress.

On the other hand, due to the high density of residential areas, many houses do not have the space to install a bathtub with a water heater near the bathtub, and it is inevitable that bathtubs with a water heater will have a built-in circulation pump as in the conventional example. Remote-type bathtubs that use circulation pumps to transport hot water to distant bathtubs have become increasingly popular in recent years.

However, the diameter of the bath pipe that connects the bathtub with the hot water heater and the vibe of the bath pipe is often 11.5 mm in inner diameter from the viewpoint of ease of construction.

Here, increasing the capacity is certainly advantageous for kitchens and showers, but if the high capacity is used for automatic hot water supply, there is a risk of erosion corrosion due to excessive flow velocity in the bath pipe. It is desirable to reduce the flow velocity in the pipe as much as possible. Furthermore, as shown in the conventional example, even if there is a mode in which hot water is automatically supplied from both the bath outgoing pipe and the bath return pipe, at that time, for example, only the bath return pipe may be blocked during use, or if it is blocked due to freezing, etc. Safety must be ensured when using the equipment.

As mentioned above, when the bath return pipe is blocked, it is important to ensure that no pressure is applied to the water level sensor, circulation pump, or pole portion of the two-way valve to ensure pressure resistance.

The present invention solves the above-mentioned problems of the conventional technology, and aims to prevent corrosion due to fluid flow in piping and ensure pressure safety of various parts installed in the piping circuit even if an abnormality occurs in the fluid flow. With the goal.

Means for Solving the Problems The first technical means of the present invention is to provide a water flow control switching means for switching and controlling the flow rate when the water flow control valve is fully open to two or more stages.

Further, the water flow control switching means of the present invention changes the fully open flow rate of the water flow control valve to a high flow rate ( For example, the water flow control is switched to 24 N/+++in).

Further, the water flow control switching means of the present invention changes the flow rate when the water flow control valve is fully open when only the automatic hot water supply solenoid valve is "ON".
For example, the water flow control is switched to +81/5 inches).

Effect (1) The water flow control switching means switches and controls the flow rate when the water flow control valve is fully open to two or more stages.

(2) Also, the water flow control switching means can be set to "ON" when only the other faucet switch that operates in the kitchen or shower is turned on, or when both the other faucet switch and the automatic hot water supply itt&fi valve are turned on.
In this case, the fully open flow rate of the water flow control valve is switched to a high flow rate (for example, 24 j!/5 in).

(3) Furthermore, when only the automatic hot water supply solenoid valve is "ON", the water flow control switching means switches the flow rate when the water flow control valve is fully open to a low flow rate.

Example Examples thereof will be described below with reference to the drawings.

Note that the same parts as those in the above conventional technique are given the same reference numerals, detailed explanations are omitted, and different parts will be mainly explained. That is, when hot water flows between the branch part 11 and the hot water tap 9, O
A plug switch 46 is provided which emits a signal to turn N (closed) and turn OFF (open) when stopped. Other plug switch 4
6 is 0N-OF with a configuration such as a butterfly switch, etc.
Any device that can detect F is fine, and the normal ON flow rate is 41
! /aIn, the OFF flow rate is designed to be able to detect about 31/mtn. Furthermore, 5 is a water flow control valve provided between the junction of the bypass valve 26 and the heat exchanger 2 for hot water supply and the branch portion 11, and the water flow rate of the water flowing into two or more stages is controlled by the water flow control switching means 47. The water flow control switching means 47 is used when the ON signal for the other faucet switch 46 is provided as shown in FIG. 3, and when the ON signal for both the other faucet switch 46 and the automatic hot water supply solenoid valve 7 is provided as shown in FIG. Then, the fully open flow rate of the water flow control valve 5 is switched to a high flow rate, for example, 24 R/in.

In addition, the water flow control switching means 47 turns on only the automatic hot water supply solenoid valve 7.
When the signal is received, the fully open flow rate of the water flow control valve 5 is switched to a low flow rate, for example, 18 e /win.

Here, the water flow control valve 5 will be explained in detail based on FIG. 4. In FIG. 4, the water flow @control valve 5 is mainly controlled by a valve receiver 103 press-fitted into the main body 101 and a valve 102 for controlling the distance between the valve receiver 103. The valve 102 is fixed to the shaft 107, and the main body 1
The spring 10 is transferred from the spring holder 105 sealed via the 01 and 0 rings 104 to the spring 106.
102 is pressed by 6. On the other hand, the shaft 107 is connected via an O-ring 111 to a bearing 109 and a threaded portion 114.
It can be moved left and right at the position shown.

The bearing 109 is sealed with the main body 101 via an O-ring 110, and is fixed to the main body 101 with a screw 115 via the motor receiver 108. The shaft 107 is the gear 11
The gear 112 is driven by a morph unit 113. That is, the amount of water is increased or decreased by adjusting the distance between the valve receiver 103 and the valve 102, and the distance is adjusted by moving the shaft 107 when the gear 112 is rotated by the motor unit 13. The method of control is that the flow rate is replaced by a pulse by the water flow sensor 4, and the pulse is converted by a microcomputer built into the controller 34. When the flow rate is lower than the specified flow rate, the gap between the valve 102 and the valve receiver 103 is widened. On the other hand, when the flow rate is higher than the specified flow rate, the valve 102 and valve holder 1
03 is made narrower.

In the above configuration, the valve 102 of the water flow control valve 5 and the valve receiver 1
03 is controlled to two or more stages (for example, high flow rate = 247!/+in, low flow rate = 18f/l1in) in the fully open state.

That is, when only the other tap switch 4G is "ON", and both the other tap switch 46 and the automatic hot water supply solenoid valve 7 are rON.
In the case of
The amount of water is controlled over the entire range from 24 N/min to 24 N/min according to usage conditions.

On the other hand, when only the automatic hot water supply solenoid valve 7 is "ON", the water flow rate control valve 5 changes the flow rate when fully opened to a low flow rate (for example, 18 N).
/win), for example 2 ffi/5in-1
The amount of water in the entire area of 842/win is controlled according to the usage conditions.

Figures 2 and 3 show water flow control at high flow rates (for example, 241
2 shows a flowchart and a control block diagram in the case where the flow rate is fully open in each case (/mtn) and a low flow rate (for example, 181/5 inch).

In FIG. 5, during automatic hot water supply using both the bath return pipe 19 and the bath return pipe 22, the bath return pipe 22 or the bath return pipe 19
water level sensor 23 and circulation pump 1 when each is blocked.
7 and the ball part of the two-way valve 31 (kg/c
j) is plotted on the vertical axis and the flow rate (1/■in) is plotted on the horizontal axis. For example, the pressure resistance of the water level sensor 23, circulation pump 17, and ball portion of the two-way valve 31 is 3 kg/cjl,
If the flow rate is less than 201/+gin, it is safe, so take a margin of 18 j! /win shows that it is safe if you control the amount of water, and conversely,
If the automatic hot water solenoid valve 7 is 1ONj and 241/sin is flowing, if either pipe is blocked during conveyance through both the bath going pipe 19 and the bath return pipe 22, the water level sensor 23
The pressure resistance of the ball part of the circulation pump 17 and the two-way valve 31 is 3.
If it is kg/c-, this means that a pressure higher than the withstand pressure will be applied, resulting in water leakage, etc., resulting in an extremely dangerous situation. Needless to say, if the seal of the ball portion of the two-way valve 31 becomes incomplete, water level control will become incomplete.

Effects of the Invention As described above, according to the present invention, since the present invention includes a water flow control switching means that switches and controls the flow rate when the water flow control valve is fully open, in two or more stages, the following effects can be expected.

(1) When a large amount of hot water is required, the water flow control valve can be fully opened to, for example, 24 N/sin, and when automatically supplying hot water to the bathtub, it can be controlled to, for example, 181/win, providing optimal hot water supply according to needs. becomes possible.

(2) If the output on the hot water supply side becomes even larger, the above 241/
32 more mtn! /siJ control is also possible.

In addition, the present invention is capable of controlling the flow rate when the water flow control valve is fully open when only the other faucet switch that detects hot water supply in the kitchen is "ON," and when both the other faucet switch and the magnetic valve for automatic hot water supply are "ON." Since the water is switched to a high flow rate, there will be no complaints such as insufficient amount of hot water when used at the same time.

Further, in the present invention, when only the automatic hot water supply solenoid valve is "ON", the flow rate when the water flow control valve is fully open is switched to a low flow rate, so the following effects can be expected.

(1) By setting the low flow rate to, for example, 181/sin, the upper limit of the flow velocity in a pipe with an inner diameter of 11.5 J/m is set to 2.9 - or less, and erosion corrosion is prevented. The durability of the outgoing pipe and the bath return pipe 22 can be improved.

(2) For example, the hot water is
Even if the bath return pipe becomes blocked due to tampering or freezing during water supply, it can be prevented from building up abnormal pressure above a certain level on the water level sensor and circulation pump.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a first embodiment of the bath pot with water heater of the present invention, Fig. 2 is a flowchart of the automatic hot water supply, Fig. 3 is a control block diagram thereof, and Fig. 4 is a block diagram of the water flow control valve. Fig. 5 is a pressure rise characteristic diagram during abnormality during automatic hot water supply, Fig. 6 is a configuration diagram of the conventional example, Fig. 7 is a flowchart of the conventional example, Fig. 8 is a control block diagram of the conventional example, and Fig. 9 is a time chart of a conventional example. 2... Heat exchanger for hot water supply, 7... Automatic hot water supply solenoid valve, 8... Hot water supply pipe B, 10...
・Hot water pipe A, 11... Branch. 2I...Bathtub, 34...Controller, 46
......Other faucet switch, 47...Water flow control switching means.

Claims (3)

[Claims] (1) A hot water supply heat exchanger, a hot water supply pipe A that transports the hot water heated by the hot water supply heat exchanger to the hot water supply destination, a hot water supply pipe B that transports the hot water to the bathtub, and a hot water supply pipe installed in the middle of the hot water supply pipe A, an automatic hot water supply solenoid valve that is installed in the middle of the water supply pipe B and issues an ON (open) signal during automatic hot water supply, and a branch between the water supply pipes A and B. and the outlet side of the heat exchanger for hot water supply, and the flow rate when the water flow rate control valve is fully open is switched to two or more stages according to the opening/closing signals of the other faucet switch and the automatic hot water supply solenoid valve. A water heater control device equipped with a water amount control switching means. (2) The water flow control switching means is used when only the other faucet switch is "ON", and when both the other faucet switch and the automatic hot water supply solenoid valve are "ON".
2. The water heater control device according to claim 1, wherein when the water flow rate control valve is turned on, the flow rate when the water flow rate control valve is fully open is switched to a high flow rate. (3) Only the solenoid valve for automatic hot water supply is set to “ON” as the water flow control switching means.
2. The water heater control device according to claim 1, wherein in the case of ``, the flow rate when the water flow control valve is fully open is switched to a low flow rate.