JPH0830612B2 - Hot water production equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water producing apparatus for producing hot water by mixing steam and cold water.

[0002]

2. Description of the Related Art An example of this type of hot water producing apparatus is shown in FIG. In this figure, a tank 1 is provided with a water supply pipe 3 whose inflow is controlled by a float valve 2 which keeps the water level constant. The hot water in the tank 1 is circulated in the circulation path 5 equipped with the pump device 4.
Circulated by. A mixer 6 is provided in the circulation path 5. In this hot water producing apparatus, the temperature of hot water on the outlet side of the mixer 6 is detected by a temperature sensor 7, and the flow rate of steam is controlled by a steam pipe 10 with a regulating valve 9 via a controller 8 based on the detection signal. To do.

Cold water C flowing from the water supply pipe 3 into the tank 1 through the float valve 2 is sucked by the pump device 4 from the suction pipe 11 and pumped into the mixer 6. At this time, if the temperature detected by the temperature sensor 7 has not reached the desired set temperature, a signal is issued from the controller 8 to the adjusting valve 9, and the steam in the steam pipe 10 is passed through the adjusting valve 9 to the mixer. 6 is supplied to the hot water and tries to return the hot water to the set temperature. A discharge pipe 13 is connected to the downstream side of the mixer 6, and the tank 1
The tip 14 of the discharge pipe 13 is inserted into the tank 1 in order to circulate hot water therein. Reference numeral 12 is a pipe for a user using hot water, by which hot water is supplied.

[0004]

However, in the above-mentioned hot water producing apparatus, since cold water is directly supplied into the tank 1 from the water supply pipe 3, if the water temperature in the tank 1 is to be stabilized, a large-scale mixture is required. A container 6 is required. Further, in recent years, it has been desired to realize a small-sized and lightweight hot water producing apparatus that can supply hot water of two different temperatures.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a small and lightweight hot water producing apparatus which can supply hot water of two different temperatures.

[0006]

In order to achieve the above-mentioned object, the present invention firstly proposes a pump device for sucking and discharging water in a tank to which cold water is supplied, and water discharged from this pump device. And a circulation path for collecting the liquid in a tank. A steam pipe for raising the temperature of the water in the tank with steam is inserted into the tank, while a low temperature discharge pipe is branched and provided downstream of the pump device in the circulation path to discharge the low temperature gas. Low temperature hot water can be taken out from the pipe. Further, a mixer is provided downstream of the pump device in the circulation path, the low-temperature hot water is taken into the mixer, and steam is blown into the low-temperature hot water in a bubble state to raise the low-temperature hot water. The heated high temperature hot water is taken out of the mixer by the high temperature discharge pipe.

[0007]

According to the present invention, since the steam pipe is inserted in the tank, low temperature hot water can be obtained. On the other hand, since the mixer is branched in the circulation path of the low temperature hot water, high temperature hot water can be obtained. To be That is, two types of hot water having different temperatures can be obtained by one device.

Further, since the cold water in the tank having a large heat capacity is heated to obtain the low-temperature hot water, the supply temperature of the low-temperature hot water can be easily stabilized. On the other hand, high-temperature hot water is obtained by heating low-temperature hot water that has been preheated in the tank in advance, so the amount of steam supplied to the mixer may be relatively small, so even if it is a small mixer, The temperature of the hot water becomes easier to stabilize.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the low temperature / hot water tank 20 is supplied with cold water C from a water supply pipe 22, and a floating valve 21 controls the water level. A tank steam pipe 26 for raising the temperature of the water in the tank 20 with the steam S is inserted into the low-temperature hot water tank 20. The tank steam pipe 26 includes a first adjusting valve 25. The first adjusting valve 25 detects the temperature of the low temperature hot water L and sends a signal to the controller 24 based on information from a first temperature sensor 46. Controlled. The tank 20 is provided in the middle of the circulation path 29.

A pump device 27 is provided in the circulation path 29. The pump device 27 sucks the low temperature hot water L in the tank 20 through the suction pipe 28 and returns the low temperature hot water L into the tank 20 through the return pipe 30. A low temperature discharge pipe 31 is branched downstream of the pump device 27. A water supply pipe 34 is branched and provided in the circulation path 29 downstream of the low temperature discharge pipe 31. This water supply pipe 34 mixes a part of the low-temperature hot water L pumped from the pump device 27 of the circulation path 29 with the mixer 3.
Supply to 2.

A mixed vapor pipe 33 and a high temperature discharge pipe 37 are connected to the mixer 32. The mixed steam pipe 3
A second adjusting valve 36 is provided at 3. The second adjusting valve 36 detects the temperature of the mixed hot water on the outlet side of the mixer 32 and sends a signal to the controller 24.
It is controlled based on the information of. In addition, 23 is a tank 20
It is a third temperature sensor that detects the temperature inside. It goes without saying that the float valve 21 can be a regulating valve equipped with a water level sensor.

FIG. 2 shows an example of the mixer 32. In this figure, a mixing chamber 40 is formed inside the mixer 32, and low-temperature hot water is supplied from a water supply pipe 34 provided on the side wall. A steam outlet pipe 45 having a large number of small holes 44 for steam outlet is inserted in the center of the mixing chamber 40. The flow rate of steam is controlled by the second adjusting valve 36 provided in the mixed steam pipe 33 in FIG.

A pressure sensor 38 is provided near the water supply pipe 34 in the mixer 32. This pressure sensor 38
Detects the pressure of the hot water H from the hot discharge pipe 37,
The signal is sent to the controller 24. The controller 24 changes the rotation speed of the pump device 27 in order to keep the detected pressure constant.

When the user consumes hot water from the high temperature or low temperature discharge pipes 37 and 31, the water level in the tank 20 is lowered, and the amount of cold water C corresponding thereto is replenished from the water supply pipe 22. The water temperature in the tank 20 is lowered by this replenishment, but at this time, the detection signal of the first temperature sensor 46 is transmitted to the controller 24, and the adjustment valve 25 is signaled to restore the low temperature hot water L in the system to a predetermined temperature. Is sent to the tank steam pipe 2
Steam is supplied to the tank 20 from 6 to prevent the water temperature in the tank 20 from decreasing. Here, since the low-temperature hot water in the tank 20 is sucked by the pump device 27 through the suction pipe 28 and returned to the tank 20 through the return pipe 30, stable stirring is constantly performed, and the low-temperature hot water L having a stable temperature is supplied. Can be obtained.

At this time, the pressure sensor 38 is used to circulate the circulation path 29.
Even if the water pressure in the inside is detected and the amount of consumption in the low temperature discharge pipe 31 changes, the output of the pump device 27 is changed via the controller 24 by, for example, an inverter or the like to keep the pressure in the circulation path 29 constant. Is possible. For example, when a large amount of low-temperature hot water L is supplied to the user from the low-temperature discharge pipe 31, if the output of the pump device 27 is fixed, the low-temperature hot water L in the circulation path 29 will return to the return pipe 30 and the low-temperature discharge pipe 31.
Therefore, the rapid drop of the water pressure causes a problem that the desired amount of hot water discharged by the user cannot be obtained. On the other hand, in this embodiment, the detection signal of the pressure sensor 38 sends a signal for increasing the output to the pump device 27 via the controller 24, and the function of returning to the predetermined pressure works. The discharge amount of hot water can be obtained. On the contrary, when the consumption of the low-temperature hot water L by the user is reduced or stopped, the output signal of the pump device 27 is reduced by the detection signal of the pressure sensor 38.

The mixer 32 heats the low-temperature hot water L preheated in the tank 20 in advance to generate high-temperature hot water H.
As a result, the amount of steam S supplied to the mixer 32 becomes smaller than in the conventional case. Therefore, even with the small mixer 32, the temperature of the high-temperature hot water H is easily stabilized.

By the way, in the mixer 32, the mixed vapor pipe 3
The temperature of the high-temperature hot water L from the high-temperature discharge pipe 37 is determined by the amount of steam supplied from No. 3 and the amount of low-temperature hot water from the water supply pipe 34. According to this embodiment, the output of the pump device 27 is output by an inverter or the like. Since the water absorption pressure and temperature from the water supply pipe 34 are kept substantially constant and the amount of steam supplied from the mixed steam pipe 33 is controlled by the adjusting valve 36, a more stable high temperature hot water H can be obtained. Obtainable.

By the way, in this embodiment, a third temperature sensor 23 for detecting the temperature of the hot water in the tank 20 is provided. The third temperature sensor 23 can be used not only for detecting the temperature in the tank 20 at the time of starting the hot water producing apparatus, for detecting the temperature in the tank 20 when the pump device 27 is not operating, and the like. It can function as a substitute or an auxiliary for the first temperature sensor 46. That is, when the consumption of hot water is small, temperature unevenness is likely to occur in the system. Therefore, the temperature is detected by the first temperature sensor 46 and the third temperature sensor 23, and when the temperature difference is large,
By increasing the discharge amount of the pump device 27, the circulation of the low-temperature hot water L can be promoted and the temperature can be stabilized.

If the user desires only hot water of one temperature, the high temperature discharge pipe 37 or the low temperature discharge pipe 31 is used.
It goes without saying that only one of them can be used. If more accurate and stable hot water is desired, a high temperature discharge pipe 37 that is preheated in the tank 20 and the circulation path 29 and can supply hot water with little reheating may be used.

[0020]

As is clear from the above description, the hot water producing apparatus of the present invention heats the water in a large tank with a steam pipe and supplies low temperature hot water from the circulation path, while the preheated low temperature water is supplied. High-temperature hot water can be supplied by reheating the hot water with the mixer branched from the circulation path. Therefore, two kinds of hot water can be supplied by a small-sized and inexpensive device, and it becomes easier to supply hot water having a more stable temperature than before.

[Brief description of drawings]

FIG. 1 is a system diagram of a hot water producing apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an example of a mixer.

FIG. 3 is a system diagram showing a configuration of a conventional hot water producing device.

[Explanation of symbols]

20 ... (low temperature hot water) tank, 26 ... (tank) steam pipe,
27 ... Pump device, 29 ... Circulation path, 31 ... Low temperature discharge pipe,
32 ... Mixer, 37 ... High temperature discharge pipe, C ... Cold water, L ... Low temperature hot water, H ... High temperature hot water, S ... Steam.

Claims (1)

[Claims] 1. A tank to which cold water is supplied, a steam pipe which is inserted into the tank to raise the temperature of the water in the tank with steam, a pump device for sucking and discharging the water in the tank, and the pump. A circulation path for collecting water from the device in the tank, a low-temperature discharge pipe for branching out the low-temperature hot water from the pump apparatus in the circulation path, and a low-temperature discharge pipe for extracting low-temperature hot water, and a pump apparatus for the circulation path. A mixer provided to branch downstream and taking in low-temperature hot water, and raising the temperature of the low-temperature hot water by blowing steam into the low-temperature hot water in a bubble state; Hot water production equipment equipped with.