JPS627962Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a freeze safety device for a first-stop instantaneous water heater.
Specifically, the present invention relates to a device in which an electric heater is attached to a waterway, and freezing is prevented by the heat generated by the electric heater.

Conventionally, a configuration has been implemented in which when the outside temperature approaches the freezing temperature, electricity is applied to an electric heater and the heat generated by the electric heater warms the water stagnant inside the waterway to prevent freezing. However, if the outside air becomes colder than the electric heater's capacity, it will not be possible to prevent freezing, and for example, the freezing pressure will press the diaphragm of the hydraulic response part and open the gas valve, causing the gas burner to ignite. This caused problems such as water pipes bursting.

The present invention was devised to solve the above-mentioned problems, and will be specifically explained based on an embodiment of the present invention shown in the drawings.

1 is a heat exchanger, 2 is a gas burner, 3 is a water supply waterway leading to the heat exchanger 1, and 4 is a hot water supply waterway. Reference numeral 5 denotes a water supply control unit installed in the water supply waterway 3, and the water supply control unit 5 is composed of a water pressure response device 6, a low pressure generation unit 7, and a temperature regulator 8, which are integrated as shown in FIG. be. The hydraulic response device 6 is a diaphragm 9
In response to the displacement of the high pressure chamber 10, low pressure chamber 11 and diaphragm 9 divided by
It has a water control 13 that changes the opening degree of a valve port 12 provided between the water pressure chamber 10 and the high pressure chamber 10, and
A low pressure generating section 7 is provided in the water supply channel 3 downstream of the high pressure chamber 10.
is provided and communicated with the low pressure chamber 11.
The temperature regulator 8 is used to vary the amount of water supplied to the heat exchanger 1 at a position downstream of the low pressure generating section 7 using a closure 14, and a branch water channel 16 communicating with the water supply channel 3 is provided inside the adjustment shaft 15. The water channel 16 is normally shut off by a pressure safety valve 17. Also, one end of a spindle 18 is brought into contact with the diaphragm 9 of the hydraulic response device 6 through the low pressure chamber 11, and the other end of the spindle 18 is brought into contact with one end of a rod 19 and is opened and closed by sliding of this rod 19. A switch 20 opens and closes a gas valve to control combustion in the gas burner 2. Reference numeral 21 denotes a pressure safety valve provided in a water channel 23 branched from the hot water supply water channel 4 outside the main body exterior 22. Reference numerals 24, 25, and 26 are electric heaters that generate heat when the outside temperature drops to near the freezing temperature, for example, when a thermo switch is turned on and the thermoswitch is turned on. It is attached to the hydraulic response device 6 of the water supply control section 5. Further, the heat generation capacity of the electric heater 26 is made larger than that of the other electric heaters 24 and 25. Furthermore, in this embodiment, the pressure safety valve 17 has a set pressure of, for example, 20 kg/cm ² , and the pressure safety valve 21
The pressure safety valve 17 is set at a higher pressure than the pressure safety valve 21 with a set pressure of, for example, 14 to 16 kg/cm ² .

The present invention has the above-mentioned configuration, and in normal use, when the hot water tap attached to the end of the hot water supply channel 4 is opened,
A water flow is generated in the water supply channel 3, and the diaphragm 9 of the hydraulic response device 6 is displaced toward the low pressure chamber 11 due to the pressure difference generated between the high pressure chamber 10 and the low pressure chamber 11, causing the spindle 18 and rod 19 to move to the left in the drawing. Let it slide. As the rod 19 slides, the switch 20 closes and the gas valve opens to supply gas to the gas burner 2, which then burns to supply hot water.

Also, if the outside temperature in winter drops to near the freezing temperature, for example, a thermoswitch (not shown) closes and energizes the electric heaters 24, 25, and 26.
4, 25, and 26 generate heat, and this electric heater 24,
The heat generated by the water supply pipes 25 and 26 warms the water remaining in the water supply waterway 3, the hot water supply waterway 4, and the water supply control unit 5, thereby preventing freezing.

Next, a case where the outside air suddenly cools down will be explained. When the outside temperature suddenly drops, waterways outside the water supply channel 3 and hot water supply channel 4 where the electric heaters 24 and 25 are attached begin to freeze first, but the accumulated water in the water supply channel in the water supply control section 5 is transferred to the water supply control section 5. The amount of heat generated by the installed electric heater 26 is calculated from the other electric heaters 24 and 2.
Since it is set larger than 5, freezing is delayed and the water supply control unit 5
The inside will finally freeze. For this reason, the internal pressure of the water passage in the water supply control unit 5 increases as the freezing progresses, and the increase in the internal pressure of the water passage causes the water pressure response device 6 to increase.
The diaphragm 9 will be displaced, but when the internal pressure of the water passage rises to a constant pressure that is sufficient to apply pressure to the diaphragm 9 to close the switch 20, the pressure safety valve 17 opens and the branch water passage 16 opens. is opened, and the pressure water is drained from the water channel 16. Therefore, even if the outside temperature suddenly drops and freezing is unavoidable, according to the present invention, the hydraulic response device will not operate at freezing pressure, and the gas burner will not burn due to freezing. be.

Therefore, according to the present invention, it is possible to reliably prevent malfunctions caused by freezing when the outside air suddenly cools, which was a problem in the conventional example, and to improve the safety of this type of stop-start instant water heater when it freezes. It can make a significant contribution to the

In this embodiment, a pressure safety valve 21 is provided in the hot water water channel 4 outside the main body exterior 22, and the set pressure of the safety valve 21 is set to be lower than that of the pressure safety valve 17. For this reason, in this embodiment, pressure relief in the event of an embers can be performed outside the main body exterior 22, and it is possible to prevent the interior of the exterior 22 from being adversely affected by corrosion, etc. due to discharge of pressurized water in the event of an embers. be.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a front view of the water supply control section 5, and FIG. 3 is a sectional view of the main parts. 1...Heat exchanger, 2...Gas burner, 3...Water supply waterway, 4...Hot water supply waterway, 5...Water supply control unit, 6
...Hydraulic response device, 16... Branch waterway, 17...
Pressure safety valve, 24, 25, 26...Electric heater.

Claims (1)

[Scope of utility model registration request] A water supply system that has an electric heater that is energized when the outside temperature drops to near freezing temperature, and that has a water pressure response device that has a heat exchanger installed in the water channel, and an electric heater that has a larger capacity than the heater and is connected to the gas valve of the gas burner. 1. A freeze safety device for a stop-start instantaneous water heater, which is attached to a control section, and has a branch water channel communicating with a water supply channel in the water supply control section, and a pressure safety valve provided in the branch water channel.