JPH023079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention particularly relates to a hot water supply device for beauty salons and the like that uses an instantaneous water heater.

[Conventional technology]

As shown in FIG. 5, a conventional water heater in a hairdressing salon, etc., has a water pipe branched from a water supply pipe 71 to an instantaneous water heater 72, and the hot water from the instantaneous water heater 72 and the water from the instantaneous water heater 72 are connected. The water was adjusted to an appropriate temperature using a hot water mixer faucet 73, and then hot water was dispensed from the faucet.

Generally speaking, when water is passed through a device such as an instantaneous water heater, the water pressure decreases, and when the boiled water and tap water are mixed at a hot water mixer faucet, the difference in pressure causes the water to become hot. It is not possible to increase the percentage of people above a certain level. The problem is that even if you open the faucet on the hot water side to get hot water, you can't get the proper water pressure. This phenomenon is especially noticeable when the water pressure of the tap is low, such as in the evening.

[Problem that the invention attempts to solve]

The present invention was devised in view of such conventional problems, and aims to provide a water heater that can consistently and stably obtain hot water at a constant pressure.

[Means for solving problems]

The present invention provides a water heater that mixes hot water from an instantaneous water heater or the like to obtain hot water at an appropriate temperature. This system is characterized by having a return waterway installed in parallel with the same pressure pump.

〔Example〕

Hereinafter, the present invention will be explained based on each embodiment shown in the drawings.

Figure 1 shows the first embodiment of the present invention, in which 1 is a water pipe, 2 is a water tank with a float valve, 3 is a pressure pump, 4 is an instantaneous water heater, and 5 and 6 are water heaters. Pressure pump, 7-1 to 7-n are hot and cold water mixing faucets, 8 to
11 and 13 to 24 are switching valves, and 12 is a pressure reducing valve.

Normally, the switching valves 9, 10, 13, 14, and 17-24 are opened, and the others are closed.

Tap water is always stored at a constant water level in the water tank 2, and when one or more of the hot and cold water mixing faucets 7-1 to 7-n are used, the pressure pump 3 is activated, and one of the taps is turned off instantly. Water is supplied to the water heater 4, heated, and then supplied to the hot water mixing faucet. The other is pressure reducing valve 1
2. The water is supplied to the hot water mixing faucet via the pressure pump 5. A hot water mixing faucet dispenses hot water at the appropriate temperature by adjusting the amount of hot water and the amount of water.

By using the pressure pump 6 in this manner, the pressure on the hot water side can be raised to the same level as the pressure on the water side, and hot water can be supplied without pressure reduction even when the amount of hot water is increased. At this time, in order to prevent the pressure on the hot water side of the instantaneous water heater 4 from becoming too high, excess pressure is returned to the inlet side of the pressurizing pump 6 through a return waterway via the switching valves 22 and 24.

The pressure pump 5 on the water side is provided to provide a stable supply of water even when the pressure of the tap water itself drops, such as in the evening, or when a water storage tank cannot be installed on the third or higher floors of a building. This can be omitted in places where there is no risk of this happening.

Since the pressure on the water side is usually higher than the pressure on the hot water side passing through the instantaneous water heater 4, a pressure reducing valve 12 is used, but this may be omitted.

FIG. 2 shows a second embodiment of the present invention in which the pressure pump 5 and the pressure reducing valve 12 are omitted and water is supplied directly from the water pipe 1 to the hot water mixing faucet 7.

If the pressure of tap water is sufficiently high, the example shown in FIG. 2 is also possible.

FIG. 3 shows a third embodiment of the present invention, in which tap water supplied from a water supply pipe 31 is pressurized to an appropriate pressure by a pressure pump 33, and then supplied to a boiler can 36 from a cold water pipe 37. The cold water is heated in the boiler can 36 by a gas burner 38, discharged from the boiler through a hot water supply pipe 39, and further circulated into the boiler can 36 by a circulation pipe 40 and a circulation pump 41. As a result, the water in the boiler can 36 has a uniform temperature. When the hot water mixing faucet 42 is opened, the hot water in the boiler can 36 is discharged from the hot water pipe 39 through a faucet or a shower nozzle. The temperature of the hot water can be adjusted to an appropriate temperature by adjusting the ratio of hot water to water using the mixer faucet 42. In the present invention, the water supply pipe 34,
Pressure pumps 45, 46 are interposed in the hot water supply pipe 39, and a return waterway is provided in the hot water supply pipe 39, so that the pressure of the hot water is kept constant as in the first embodiment.

In addition, in Fig. 3, 32 is a water stop valve, 35 is a safety valve,
43 is an air bleed valve, and 44 is a safety valve.

With this configuration, water, especially shower water, can be constantly supplied at a constant temperature and water pressure by the action of the pressure pump and the circulation pump.

FIG. 4 shows a fourth embodiment of the present invention, which is particularly characterized by the provision of a hot water storage tank. That is, in the figure, 51 is a water pipe, 52 is a water tank, 53 is a water supply pump, 54 is a pressure reducing valve, and 55
is a safety valve, 56 is a boiler, 57 is a solenoid valve, 58
is a hot water storage tank whose surroundings are covered with a heat insulating material, 59 is a flexible pipe as a heat exchanger, 60 is a circulation pump, 61 is a thermostat, 62 is a water level detection electrode, 63 is a water level detection relay, 64 is an overflow pipe, and 65 is a main body. Pressure pump according to the invention, 66 is a return waterway, 6
7 is a hot water mixing faucet, and 68 is a strainer.

According to the fourth embodiment, by providing the hot water storage tank 58, a large amount of hot water at a constant temperature can be supplied when necessary, regardless of the water pressure of tap water.

[Effect of idea]

As described above, according to the present invention, at least the pressure on the hot water side of the hot water mixing faucet can be maintained constant.
In addition to eliminating the problem of poor hot water flow due to the pressure difference between hot water and cold water, it also provides a stable supply of hot water at the right temperature and amount even during times when water pressure is low, such as in the evening, and also eliminates the need to install a water storage tank on the roof of a high-rise residence. It has the advantage of being able to supply hot water and water at sufficient pressure even when the water is hot.

[Brief explanation of drawings]

1 to 4 are block diagrams of first to fourth embodiments of the present invention, respectively, and FIG. 5 is a block diagram of a conventional instantaneous water heater. 1... Water pipe, 2... Water tank with float valve, 3... Pressure pump, 4... Instant water heater, 5,
6... Pressure pump, 7, 7-1 to 7-n... hot water mixing faucet, 8 to 11, 13 to 24... switching valve,
12...Pressure reducing valve.

Claims (1)

[Scope of utility model registration request] In a water heater that mixes hot water from an instantaneous water heater or the like to obtain hot water at an appropriate temperature, a pressure pump is installed at least in the hot water pipe between the hot water outlet of the instantaneous water heater and the hot water mixing faucet. A water heater for a hairdressing salon is characterized in that a return waterway is provided in parallel with the same pressure pump.