JPH0711687A - Water heater - Google Patents

Abstract

(57) [Summary] [Purpose] A mixed type hot water device that can supply hot water safely by preventing hot water supply at dangerous temperatures. [Structure] A bypass pipe 22 bypassing a hot water tank 21 with a built-in heater 26 and a hot water discharge pipe 23 are joined to obtain a set value of a water temperature detected by a water temperature detector 28 and a hot water temperature set value by a hot water temperature setting volume 43. Based on the controller 45, the boiling temperature of the hot water tank 21 is calculated and brought to the boil, and the flow rate control valve 18 is opened by the hot water supply instruction from the setting device 39 so that the hot water from the hot water tank 21 and the water from the bypass pipe 22 are opened. Is mixed, and the mixed water is further heated and heated by the heater 30, the temperature detected by the warm water temperature detector 31 is adjusted to a set value, and hot water is supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water device for mixing hot water and water to adjust the hot water temperature.

[0002]

2. Description of the Related Art Conventionally, as this kind of hot water apparatus, FIG.
There was something like the one shown in
No. 76).

In FIG. 6, reference numeral 1 denotes a water supply tank from which water is sucked by a pump 2 and reaches a branch point 4 through a water supply pipe 3. A bypass pipe 5 is branched from a branch point 4, and a hot water tank 8 equipped with a heater 6 and a tank temperature detector 7 is provided.
And a hot water supply pipe 14 from a hot water tank 8 in a mixing chamber 13 via a mixing device 12 equipped with a valve 11 driven by a stepping motor 10 mounted on a valve housing 9.
Has joined again. A temperature detector 15 for detecting the temperature of the mixed hot water is provided in the mixing chamber 13, and the flow rate through the bypass 5 by the stepping motor 10 and the valve 11 is adjusted so that the temperature detected here becomes a predetermined value. It is controlled and regulates the temperature of the hot water supplied from the nozzle 16.

[0004]

In such a conventional hot water apparatus, when the pump 2 is stopped when the cleaning is stopped, the temperature of the mixing chamber 13 is lowered by natural heat dissipation, so that the set temperature should be maintained. As a result, the stepping motor 10 throttles the valve 11 and finally closes the bypass pipe 5 side completely. Therefore, during reuse, the operation was started with the hot water tank 8 side fully opened, and hot water was temporarily supplied from the nozzle 16 and there was a risk of burns.
When the control system fails, the stepping motor 10
When the valve 11 is closed at, hot water is supplied only and hot water in the hot water tank 8 comes out as it is, which is very dangerous.

The present invention is intended to solve the above problems,
An object of the present invention is to provide a hot water device that can safely supply hot water while taking advantage of the characteristics of the mixing type.

[0006]

To achieve the above object, a hot water apparatus of the present invention comprises a hot water tank, hot water tank heating means for heating water in the hot water tank, and a water supply pipe to the hot water tank. A water temperature detector, a bypass pipe branched from the water supply pipe to bypass the hot water tank, a constant ratio mixing means for mixing the water from the bypass pipe with the hot water from the hot water tank at a constant ratio, and a hot water discharge pipe from the hot water tank And a hot water pipe where the bypass pipe joins, a hot water heating means provided in this hot water pipe, a hot water temperature detector for detecting the temperature of the hot water, a hot water temperature setter for setting the hot water temperature, and a set value of the hot water temperature. Controls the hot water heating means by comparing the set value of the hot water temperature setter and the signal of the hot water temperature detector with the hot water tank control unit that sets the boiling temperature of the hot water tank based on the water temperature and controls the hot water tank heating means. A controller with a hot water heating controller Ete and constitutes.

Further, the boiling temperature setting value in the hot water tank control unit is set to a low value in consideration of the heating capacity of the hot water heating means and the temperature increase amount by the hot water heating means based on the hot water supply amount, and the controller is set. It is what constitutes.

Further, the hot water heating means and the hot water tank heating means are combined, and when the hot water is supplied, the control of the hot water heating control section is prioritized over the control of the hot water tank control section and is set by the temperature setting device. The controller is constructed by obtaining the hot water temperature.

[0009]

With the above-described structure, the hot water apparatus of the present invention sets the boiling temperature of the hot water tank based on the water temperature and the set temperature of the hot water temperature setting means, and mixes the hot water and water at a fixed mixing ratio by the stoichiometric mixing means. This eliminates the moving parts that adjust the water supply pipe and the bypass pipe, prevents the supply of hot water as in the past and prevents danger, and heats the hot water further by the hot water heating means to obtain hot water at the set temperature. It is a thing.

Further, by setting the boiling temperature set value to a low value in consideration of the heating capacity of the hot water heating means and the temperature increase amount by the hot water heating means based on the amount of hot water supplied, the hot water heating means is surely brought out when tapping hot water. The temperature is raised by heating to obtain hot water at the set temperature.

Further, the constitution is made to serve as both the hot water heating means and the hot water tank heating means, and when the hot water is supplied, the control of the hot water heating control section is prioritized over the control of the hot water tank control section, thereby simplifying the construction. In addition, we are trying to obtain hot water at the set temperature.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cutaway sectional view of a main part of a water heater showing an embodiment of the present invention. The water supplied from the water supply pipe 17 passes through a branch point 2 via a pump 19 and a flow rate control valve 18 that opens and closes a flow path provided in the water supply pipe 17 and adjusts the flow rate.
It reaches 0. A bypass 22 that bypasses the hot water tank 21 is branched from the branch point 20, and joins with a hot water discharge pipe 23 from the hot water tank 21 at the beginning. The tap pipe 23 and the bypass pipe 22 are provided with orifices 24, 24 'as stoichiometric mixing means.
The orifices 24, 24 'are set so that the resistance ratio between the hot water tank 21 side path and the bypass pipe 22 side path from the branch point 20 to the confluence point 25 is 1: 1. This orifice is a normal orifice whose opening has no movable portion, but it may be a valve of a type that is movable during adjustment or fixed during use. Inside the hot water tank 21, a heater 26 as hot water tank heating means and a hot water temperature detector 27 are provided. A water temperature detector 28 for detecting the water temperature is provided near the branch point 20. Hot water pipe 2 in which outlet pipe 23 and bypass pipe 22 merge
A heater 30 serving as a hot water heating means is provided at 9, and a hot water temperature detector 31 for detecting the hot water temperature is provided downstream of the heater 30. The hot water tank 21 has a small tank capacity because the hot water device has a structure in which hot water is mixed with water to obtain an appropriate temperature. In addition to this, the hot water tank 21
A float switch 32 for monitoring the amount of water in the hot water tank 21 for ensuring safety, a temperature safety switch 33 for directly turning off the power source when the abnormal temperature of the entire hot water tank 21 rises, a vacuum breaker 34, and the like are provided.

Further, the bypass pipe 22 is the hot water tank 21.
Since it passes below, the bypass pipe 22 is filled with expanded water when boiling the hot water in the hot water tank 21, and the supply temperature does not temporarily overshoot when the hot water is re-supplied.

The hot water pipe 29 is connected to the nozzle unit 35 so that hot water can be supplied to the nozzle. The nozzle unit 35 has an anus washing nozzle 36 and a bidet washing nozzle 37, and switching is performed by a switching valve 38. The operation of the water heater is performed by the setting device 39. The setting device 39 is provided with an anus washing switch 40, a bidet washing switch 41, a stop switch 42, a hot water temperature setting volume 43 as a hot water temperature setting means, and a hot water flow rate setting volume 44. Reference numeral 45 is a controller, which has a hot water tank control unit 46 and a hot water heating control unit 47 inside.

In the above structure, the operation of this embodiment will be described below.
The operation will be described. When the anus washing switch 40 provided in the setting device 39 is pressed, the switching valve 38 is switched to the anus washing nozzle 36 side by the instruction of the controller 45, the flow control valve 18 opens the flow path, and the hot water flow rate setting volume 44 sets. The pump 19 is controlled to the number of rotations corresponding to the flow rate thus set, the anus washing nozzle 36 is projected by the water pressure, and a predetermined flow rate for washing flows. At this time, the hot water that has been boiled in the hot water tank 21 in advance and the water that has passed through the bypass pipe 22 are mixed and reach the hot water pipe 29. The mixing ratio of hot water and water is orifice 2
Since the resistance ratio of both paths by 4 and 24 'is set to be 1: 1, the hot water and the water are mixed in the amount of 1: 1. If the resistance values of both paths can be determined without the need for an orifice, this can be dispensed with. In this case, the bypass pipe 22 and the hot water outlet pipe 23 correspond to the stoichiometric mixing means. The boiling temperature of the hot water tank 21 is set based on the set value of the hot water temperature setting volume 43, the water temperature, the heating capacity of the heater 30, and the hot water flow rate, and is set by the hot water tank temperature control unit 46 of the controller 45. The boiling temperature and the temperature detected by the hot water temperature detector 27 are compared to adjust the heater 26. The mixed warm water is heated and heated by the heater 30, and the detected value of the warm water temperature detector 31 and the set value of the warm water temperature setting volume 43 are compared by the warm water heating controller 47 to obtain the set temperature. Ability is controlled. By further heating and raising the temperature of the mixed hot water, the temperature can be corrected even if there is a water temperature fluctuation, a boiling error of the hot water tank 21, or a transient temperature fluctuation of the mixed water, and a temperature as set can be obtained. Has become. In addition, since the temperature of the hot water tank 21 may be low, the bypass pipe 22 should be used by any chance.
It is safe even if there is a blockage or mixture of air bubbles. The temperature of the water supplied through the water supply pipe 17 is detected by the water temperature detector 28, stored in the controller 45, the initial detection value is cut, and the abnormal value is cut. It is averaged and stored as a water temperature average value at predetermined intervals. In the controller 45, the hot water temperature setting volume 4
From the set value of 2, the heating temperature rise amount obtained from the heating capacity of the heater 30 and the maximum flow rate set by the flow rate setting volume 44 is subtracted to calculate the value of the mixed hot water temperature. Then, based on FIG. 2, the boiling temperature of the hot water tank 21 is set by the controller 45 from the average water temperature value and the mixed hot water temperature calculated value. Then, the calculated boiling temperature and the detection value of the hot water temperature detector 27 of the hot water tank 21 are compared by the hot water tank control unit 46,
The capacity of the heater 26 is controlled. The controller 45 sets the boiling temperature set value in the hot water tank control unit 46 to the heater 30.
Since it is set to a low value in consideration of the temperature rise amount based on the heating capacity and the hot water supply amount of the heater, the heater must be compared to when the boiling temperature is constant or when the heating capacity and the hot water supply amount are not added. Since the hot water temperature is adjusted at 30, there is an advantage that hot water can be supplied at an accurate temperature that is the set temperature.

When it is desired to adjust the flow rate, when the hot water flow rate setting volume 44 is operated, the rotational speed of the pump 19 is changed and the flow rate injected from the anus washing nozzle 35 is changed correspondingly. When the stop switch 42 is pressed, the switching valve 38 is returned to its original state, the flow control valve 18 is de-energized, and the supply of hot water is stopped. When the temperature in the hot water tank 21 does not reach the calculated boiling temperature even when the hot water supply is stopped, the heater 25 continues to be energized, but the average water temperature memory value is that the hot water supply is stopped. Therefore, since the update is stopped, the boiling temperature calculation is performed using the value immediately before the stop switch 41 is pressed. When hot water is being supplied, the hot water pipe 23 and the bypass pipe 22 have fixed orifices 24, 24 'and no movable elements, so there is no possibility of malfunction or immobilization or clogging of objects. Therefore, hot water is not supplied at the time of supplying the hot water, and there is no danger. In addition, since there is no moving element, no failure occurs, and the natural temperature of the temperature detection unit cools the mixing valve to open the hot water side and close the hot water side during hot water supply. There is no such inconvenience. Also, by using the signal from the hot water temperature detector 31, if hot water comes out, the flow control valve 18 is closed to ensure safety. This is because when the temperature detected by the hot water temperature detector 31 during use exceeds the temperature set by the hot water temperature setting volume 43 within a predetermined range (for example, 40 If the temperature is set to 42 ° C or higher for 5 seconds or longer, or if the temperature is 45 ° C or higher for 2 seconds or longer, etc., the controller 45 determines that there is an abnormality, and the flow control valve 18 stops the supply of hot water for safety. Secure. At the time of this abnormality, the fact that it is abnormal is displayed on the setting device 39.

When the bidet washing switch 36 is pressed, the bidet washing nozzle 32 projects and the same as in the case of anal washing.
Cleaning is performed.

The main part of these control operations is shown in FIGS.
Is performed as shown in the flowchart of FIG.

FIG. 5 shows a second embodiment of the present invention. First
The flow control valve 48 is of a type that uses a solenoid that can adjust the flow rate without being affected by water pressure. The flow rate control valve 48 adjusts the flow rate without a pump according to the current value. Is possible. The heating of the hot water tank 21 is performed by an external heater 49 provided outside and also serving as a hot water tank heating means and a hot water temperature heating means, via a bottom plate 50 made of a copper plate on the bottom surface of the hot water tank. The temperature of the hot water tank 21 is similarly detected by the hot water temperature detector 27. Further, instead of the orifices 24, 24 ', in the second embodiment, the hot water outlet pipe 51
And the resistance of the bypass pipe 52 constitutes a stoichiometric mixing means. Also, for both drought detection and abnormal temperature rise detection,
Temperature detecting means 53 is provided on the bottom plate 50. Further, the controller 54 basically has a hot water tank controller 55 and a hot water temperature controller 56, but when the setting device 39 is operated to supply hot water, the hot water tank 21 is boiled. The heater 49 is preferentially controlled so that the hot water temperature set by the hot water temperature setting volume 43 is obtained. This compares the set value of the hot water temperature setting volume 43 with the temperature of the hot water temperature detector 31, the hot water temperature control unit 56 controls the heater 49, and the supplied hot water temperature has priority over the boiling of the hot water tank 21. Control it. In this case, the hot water tank 21 is heated by the residual heat of the heater 49, but since there is no ability to raise the inflow water to the calculated set temperature of the hot water tank, the temperature inside the hot water tank 21 does not become abnormally high. The advantage of the second embodiment is that the hot water tank heating means and the hot water temperature heating means are combined, and since heating is performed from the bottom surface of the hot water tank, the hot water as set to the bottom surface of the hot water tank is boiled. The point of good tank efficiency is raised. It is also an advantage that the temperature detecting means 53 provided on the bottom plate 50 can function as the float switch 32 and the temperature safety switch 33 in the first embodiment.

[0021]

As described above, according to the present invention, the hot water heated in the hot water tank and the water from the bypass pipe bypassing the hot water tank are provided.
Mixing using constant ratio mixing means, and then heating the mixed hot water by the hot water temperature heating means to supply hot water.The boiling water in the hot water tank must be heated by the hot water temperature heating means to control the temperature. Since the temperature to be raised is determined and the hot water tank heating means and the hot water heating means are combined, the following effects are obtained.

(1) Since the stoichiometric mixing means having no moving parts is used, it is possible to prevent the risk of hot water being supplied without failure or clogging of foreign matters, and to stop hot water supply as in the conventional case. Since the valve sometimes does not open the hot water side and closes the hot water side, high temperature hot water is not supplied even when re-hot water is supplied, and safety is high.

Further, since the mixed hot water is further heated by the hot water heating means, it is possible to obtain a stable hot water temperature which is set according to the fluctuation of the feed water temperature, the fluctuation of the boiling water temperature and the transient fluctuation. Even in the unlikely event of a failure such as clogging of the bypass pipe, the boiling temperature of the hot water tank is low, so it is even safer.

Further, even when the set temperature is changed by the hot water temperature setting means during use, the hot water can be instantly changed by the hot water heating means to supply hot water.

(2) Since the boiling temperature setting value in the hot water tank control unit is set to a low value in consideration of the temperature increase by the hot water heating means based on the heating capacity of the hot water heating means and the hot water supply amount, The heating is always performed by the hot water heating means, and the hot water at the set temperature can be reliably obtained in any situation.

(3) Since the hot water heating means and the hot water tank heating means are combined, the structure can be simplified and compact, and the controller controls the hot water heating control unit when hot water is supplied. Since the control is performed prior to the control of the control unit, the hot water temperature set by the temperature setting device can be reliably obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a water heater according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram for calculating a boiling temperature of a controller used in the hot water device.

FIG. 3 is a hot water tank control flow chart of a controller used in the hot water device.

FIG. 4 is a flow chart of hot water heating control of a controller used in the hot water device.

FIG. 5 is a cross-sectional view of the essential parts of a water heater showing a second embodiment of the present invention.

FIG. 6 is a cutaway sectional view of a main part of a conventional water heater.

[Explanation of symbols]

 17 Water Supply Pipe 18 Flow Control Valve 21 Hot Water Tank 22 Bypass Pipe 23 Hot Water Pipe 24, 24 'Orifice (Stoichiometric Mixing Means) 26 Heater (Hot Water Tank Heating Means) 27 Hot Water Temperature Detector (Hot Water Tank Heating Means) 28 Water Temperature Detector 29 hot water pipe 30 heater (hot water heating means) 31 hot water temperature detector 39 setter 43 hot water temperature setting volume (hot water temperature setting means) 45, 54 controller 46, 55 hot water tank control section 47, 56 hot water temperature control section 49 heater (Hot water tank heating means, hot water temperature heating means) 51 Hot water supply pipe (stoichiometric mixing means) 52 Bypass pipe (stoichiometric mixing means)

Claims (3)

[Claims] 1. A hot water tank, hot water tank heating means for heating water in the hot water tank, a water supply pipe for supplying water to the hot water tank, a water temperature detector for detecting a water supply temperature, and a branch from the water supply pipe. A bypass pipe that bypasses the hot water tank, a constant-ratio mixing unit that mixes the water from the bypass pipe with the hot water from the hot water tank at a constant ratio, and hot water obtained by joining the hot water discharge pipe from the hot water tank and the bypass pipe Pipe, hot water heating means provided in the hot water pipe, hot water temperature detector for detecting the temperature of hot water raised by the hot water heating means, and hot water for setting hot water temperature supplied through the hot water heating means A temperature setter, a hot water tank control unit that sets the boiling temperature of the hot water tank based on the set temperature of the hot water temperature setter and the water temperature of the water temperature detector, and controls the hot water tank heating means, and the hot water temperature Setting device Set temperature and the hot water temperature detector water heater equipped with a controller having a hot water heating control unit for signal compared to the controls the hot water heating means. 2. The controller sets the boiling temperature set value in the hot water tank control unit to a low value in consideration of the temperature increase by the hot water heating means based on the heating capacity of the hot water heating means and the hot water supply amount. The hot water apparatus according to 1. 3. The hot water heating means and the hot water tank heating means are combined together, and the controller performs control of the hot water heating control section prior to the control of the hot water tank control section at the time of supplying hot water, and a temperature setting device is used. The hot water apparatus according to claim 1, wherein the set hot water temperature is obtained.