JPH0442673Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a water heater, and particularly to an anti-freezing device thereof.

(Prior art) As a conventional antifreeze device, for example,
As shown in Publication No. 157042, when the outside air temperature or water temperature falls below a set temperature, a low-temperature operation valve is opened to allow water to flow, and an electric heater attached to the waterway is energized to prevent freezing.

By the way, in such conventional anti-freeze devices, since the equipment is prevented from freezing by flowing water, the problem is that water is wasted for a long time because water is constantly drained when the solenoid valve is opened due to low temperature. It was hot. In addition, to effectively prevent freezing,
There is also the drawback that the heater must be installed separately, which increases the number of parts.

Furthermore, the antifreeze device disclosed in Japanese Utility Model Application Publication No. 54-14447 basically prevents freezing due to running water, and has the same problems as mentioned above, and is structurally thermostatic. Since a wax element is required, an increase in the number of parts is unavoidable.

On the other hand, a shower nozzle is installed at the top of the main body of the vertically long unit, the shower nozzle is connected to the hot water supply path from the heat source equipment, and a hot water supply path for the drain is provided that branches from the hot water supply path and reaches the drain, and a drainage channel is also provided. If such a conventional freezing prevention device using flowing water is used, the amount of flowing water becomes large, resulting in a large amount of wasted water.
On the other hand, even a small amount of heat generated from still water can be expected to have an anti-freezing effect.

Therefore, the inventors began development to prevent freezing by draining only the accumulated water in the water heater after hot water is supplied, without using running water to prevent freezing.

(Problem that the invention attempts to solve) However, the shower nozzle is installed at the top of the main body of the vertically long unit, and the shower nozzle is connected to the hot water supply path from the heat source equipment, and the hot water supply path for the system branches from the hot water supply path and leads to the system. In the case where a water supply channel is provided along with a drainage channel, the water supply channel is vertically long, so due to the influence of pipe resistance, even if water is drained, the hot water supply is located below the branch point from the hot water supply channel to the drainage channel. It was not possible to drain the stagnant water in the water supply channel and hot water supply channel, and there was still the problem that the stagnant water would freeze.

Therefore, the present invention aims to prevent freezing of a water heater having a vertically elongated unit by using a solenoid valve for supplying hot water without using a separate heater.

(Means for solving the problem) In order to solve the problem, the present invention provides a shower nozzle at the top of the main body of the vertically long unit.
The shower nozzle is connected to the hot water supply path from the heat source equipment, and the hot water supply path is equipped with a solenoid valve and a temperature detector, and a hot water supply path for the hot water supply is connected to the hot water supply path that branches from the hot water supply path downstream of the solenoid valve and reaches the hot water supply path. In the system, a drain is provided, and solenoid valves 18a and 18b are provided in the hot water supply path and the drain, respectively, and these solenoid valves are opened and closed by operation of a hot water supply indicator,
While closing the original solenoid valve, both the solenoid valves 18a, 1
8b is opened to drain water from the upper part of the unit main body, both solenoid valves 18a and 18b are closed, and when the temperature detected by the temperature detector is below the set temperature, both the solenoid valves 18a are closed while the original solenoid valve is closed. , 18b
It is used as an anti-freeze device for water heaters, which is made by opening the valve when energized.

(Function) In the present invention, a shower nozzle is provided at the top of the main body of the vertically long unit, and the shower nozzle is connected to the hot water supply path from the heat source equipment, and the hot water supply path is equipped with a solenoid valve that opens and closes the hot water supply path and a temperature detector. A solenoid valve 18a, a solenoid valve 18a, is provided in the hot water supply path and the drainage path, respectively.
18b is provided, and these solenoid valves are opened and closed by the operation of a hot water supply indicator, and after a certain period of time has elapsed after hot water supply has stopped, the original solenoid valve is closed and both solenoid valves 18a and 18b are opened to drain the water above the main body of the unit. After draining water, both solenoid valves 18a and 18b are closed, and only when the temperature detected by the temperature sensor is below the set temperature, both the solenoid valves 18a and 18b are energized and opened while the original solenoid valve is closed. This is an antifreeze device for the equipment.

(Example) The configuration of the present invention will be described below based on an example shown in the drawings.

Figure 1 shows an example of a water heater installed in a bathroom.
A shower nozzle 4 with a nozzle hole 2 for pouring hot water and a nozzle hole 3 for squirting, and a shower nozzle 5 for mist are provided in the upper part of the vertically long main body 1, a hand shower 6 is provided in the center, and a shower nozzle 5 is provided in the lower part. Karan 7 is installed in the. 8 is a mirror, 9 is an operation unit for starting and stopping shower hot water supply from the shower nozzles 4 and 5, and setting the shower temperature and flow rate; 10 is a control unit for starting and stopping hot water supply from the hand shower 6 and flusher 7, and for setting the hot water temperature and flow rate. This is the operation section for setting. Reference numeral 11 designates a collar provided near the bathtub 12 and connected to a hot water supply path from the main body 1 of the unit, and reference numeral 13 designates an operating section thereof. Figure 2 shows the unit main body 1 in Figure 1.
This is an internal piping diagram showing a hot water outlet pipe 14 from a heat source device (not shown), a hot water mixing valve 16 to which hot water is supplied from a water supply pipe 15, a former solenoid valve 18 installed in a hot water supply path 17 downstream of the hot water mixing valve 16, and temperature. It has a detector 19, a water amount detector 20, and a water amount control valve 21, and the water amount control valve 2
A hot water supply path 17a for a run, which branches the hot water supply path 17 downstream of 1 and reaches the above-mentioned run 11, and a drainage channel 17
b. Connect the shower water supply path 17c, connect the solenoid valve 18a to the shower water supply path 17a, and connect the drain path 17b to the shower water supply path 17c.
A solenoid valve 18b is interposed in the shower water supply path 17c, and a solenoid valve 18c is interposed in the shower hot water supply path 17c. Also, the downstream side of the solenoid valve 18c of the water supply path 17c for the shower is connected to the nozzle holes 2, 3, the nozzle 5, the hand shower 6, and the collar 7.
The two are connected to each other via a solenoid valve.

In the above configuration, when using a hand shower as an example of hot water supply, for example, the main solenoid valve 18 and the solenoid valve 18c are
is opened, the solenoid valves 18a and 18b are closed, and the solenoid valve for the hand shower is opened to supply hot water. During hot water supply, the mixing valve 16 controls the valve openings on the hot water side and the water side in accordance with the deviation between the set temperature and the temperature detected by the temperature detector 19. In addition, the amount of hot water to be supplied is determined by the water amount control valve 21, which determines the opening degree of the valve, based on the set flow rate and the amount of water detected by the water amount detector 2.
Control is performed according to the deviation from the detected flow rate of 0. The temperature and flow rate of hot water supplied from the showers 7, 11 and other showers are controlled in the same manner as described above.

Next, when the hot water supply is stopped, the original solenoid valve 18, the solenoid valve 18c, and the solenoid valve on the hand shower side are also closed.
When such hot water supply stop continues for a certain period of time, the solenoid valves other than the main solenoid valve 18 and the solenoid valve 18b are opened for a predetermined period of time to drain water from the hot water supply path 17 and the shower hot water supply path 17c.

However, even if water is drained, in the illustrated example, water can be drained in the channel located above the branch point Z from the hot water supply channel 17 to the drain channel 17c, but the water supply channel 17 below it can be drained.
Furthermore, it is impossible to drain water from the hot water supply path 17a, and even if the branch point Z is positioned further below, the water cannot be drained completely.

For this reason, in this embodiment, when the temperature detector 19 detects a temperature below the set temperature, the control circuit 30 energizes the solenoid valves 18a and 18b.

That is, as shown in FIG. 3, when the water temperature drops to 3°C, close to the freezing temperature, A, both solenoid valves 18a,
The coil 18b is energized B, and the heat generated thereby raises the temperature of the water in the path. If the water temperature rises C or there is a hot water supply instruction operation D, the energization is stopped E. Although the temperature sensor for detecting the predetermined temperature may be one that detects the outside temperature, the one in this embodiment also serves as a temperature sensor for controlling the mixing valve 16, which has the advantage of reducing the number of parts and reducing the water temperature due to heat generation. Directly detecting the rise has the advantage of preventing unnecessary energization of the coil of the solenoid valve.

(Effects of the invention) As described above, according to the invention, it is possible to prevent freezing without using an electric heater or a low-temperature operating valve, and it is possible to reduce the number of parts of a water heater and reduce its cost.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a water piping diagram of the same example, and FIG. 3 is a flowchart of the main parts. 17...Hot water supply path, 18...Original solenoid valve, 18a...
...Solenoid valve, 19...Temperature detector.

Claims (1)

[Scope of utility model registration request] A shower nozzle is installed at the top of the main body of the vertically long unit, and the shower nozzle is connected to the hot water supply line from the heat source equipment.The hot water supply line is equipped with a main solenoid valve and a temperature detector, and the hot water supply line downstream of the main solenoid valve is connected to the hot water supply line. A hot water supply path for the hot water supply system is provided that branches from the water supply path and reaches the hot water supply channel, and a drainage path is also provided, and electromagnetic valves 18a and 18b are provided in the hot water supply path for the hot water supply system and the drainage path, respectively, and these solenoid valves are opened and closed by the operation of a hot water supply indicator. At this time, the original solenoid valve is closed and both the solenoid valves 18 are closed.
After opening a and 18b to drain water from the upper part of the unit main body, both solenoid valves 18a and 18b are closed, and when the temperature detected by the temperature sensor is lower than the set temperature, both the solenoid valves are closed while the original solenoid valve is closed. valve 18a,
A freezing prevention device for a water heater, which is formed by energizing and opening the valve 18b.