JP3172013B2 - Automatic water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically supplying hot water to a bathtub or the like.

[0002]

2. Description of the Related Art As a conventional technique, for example, as disclosed in Japanese Patent Publication No. 5-38213, a water level is detected by a water level detection signal even after a predetermined hot water supply restriction time elapses after the start of hot water supply to a bathtub. If the data does not reach a certain level,
There is a structure in which the hot water supply operation is immediately stopped.

[0003]

The above prior art has a structure in which the hot water supply operation is immediately stopped when the water level does not reach a predetermined level even after a predetermined hot water supply time limit has elapsed after the start of hot water supply. For example, when a large-capacity bathtub is installed at the installation site or when the installation site is at a low water pressure, the water level does not reach the predetermined water level even after the predetermined hot water supply time limit has elapsed, so that it is determined to be abnormal. Then, the hot water supply operation was stopped.

[0004] In view of the above problems of the prior art, the automatic hot water supply apparatus of the present invention is designed to meet these conditions at the installation site in the case of a large-capacity bath tub or hot water supply under low water pressure conditions. The purpose of the present invention is to provide an automatic hot water supply device that can be switched and selected.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, an automatic hot water supply apparatus according to the present invention is provided when a predetermined water level is not reached even after a set hot water supply time limit has elapsed since the start of automatic hot water supply. abnormality judgment includes an abnormality determination processing function for stopping the automatic hot water supply and, and, the automatic hot water supply apparatus odor provided with selection means for selecting whether to operate the said aberrantly determination processing function
When the above-mentioned selection means is installed at the installation site,
Between the normal hot water supply time limit and hot water supply longer than the hot water supply time limit
In that a switching means for selecting switching the time limit and
It is set to feature.

[0006]

The automatic hot water supply apparatus of the present invention having the above configuration has
For example, when a large-capacity bathtub is installed at the installation site, or when the installation site has low water pressure, the selection means is switched by the switching device at the installation site, and the hot water supply time limit until the predetermined water level is reached. if normal hot water time limit than the length <br/> have switched example selection for hot water supply time limit, obtained conforms hot water to bath or low water pressure the large volume, the hot water supply operation is stopped until a predetermined water level The problem of doing so is resolved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the automatic hot water supply apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a configuration in which the present invention is applied to a bath water heater as one embodiment of the automatic water heater of the present invention. The bath water heater 1 includes hot water in a bathtub 2 (hereinafter referred to as bath water). ), A circulating heating unit 10 for circulating and heating, a hot water supply unit 30 for supplying hot water heated by gas combustion to the bathtub 2 via the circulating heating unit 10, and a controller 50 for controlling these operations. .

The hot water supply unit 30 is provided with a water supply passage 3 to which cold water is supplied.
1, a heat exchanger 32 connected to the water supply path 31, a hot water path 33 connected downstream of the heat exchanger 32, and a hot water path 33
Hot water supply path 34, general hot water supply path 35 provided by branching
And a flow path. A water flow sensor 36 for detecting the flow rate and a thermistor 37 for detecting the incoming water temperature are provided in the water supply passage 31.
The tapping path 33 is provided with a flow control valve 38 for adjusting the flow rate and a thermistor 39 for detecting tapping temperature. When passing through the heat exchanger 32, the cold water guided from the water supply passage 31 is heated by the heat of combustion of the burner 40 to exchange heat, and controls flow rate and combustion amount (by a gas proportional control valve (not shown)).
Then, the temperature becomes a predetermined temperature and is sent out.

A bath hot water supply path 34 branched from a hot water supply path 33
Is provided with a water supply valve 41 for opening and closing this flow path, a hopper 42 as a cutoff valve, and a check valve 43 for preventing backflow from the circulation heating unit 10, and is connected to the circulation heating unit 10. On the other hand, an external hot water supply pipe 4 communicating with a hot water supply port 3 such as a washroom or a shower is connected to a general hot water supply path 35 branched from the hot water supply path 33. In addition, 5 is a hot-water tap in the figure.

The circulation heating unit 10 includes a circulation path 11 for circulating hot water in the bathtub 2, a heat exchanger 13 provided in the middle of the circulation path 11 for heating and heated by a burner 12, and a heat exchanger 13. A water flow switch 14 provided in the upstream circulation path of
A circulation pump 15, a flow path switching valve 16 for opening and closing a flow path on the upstream side (upstream in the circulation direction) of the circulation pump 15, and a pressure for obtaining a bathtub water level by detecting a water pressure on the upstream side of the flow path switching valve 16. A sensor 17 and a thermistor 18 for detecting a circulating water temperature are provided. The shuttle circuit 11 is connected to the outgoing pipe 6 and the return pipe 7 and communicates with the bathtub 2.

The controller 50 is responsible for automatic hot water supply control, circulating heating control, and the like, and includes a CPU, a RAM, and a ROM constituting a well-known arithmetic logic operation circuit (not shown), an input interface for inputting signals from various sensors, and It is composed of an output interface for outputting drive signals to various actuators.

A bath remote controller 60 provided in a bathroom is connected to the controller 50. The bath remote controller 60 includes a normal temperature indicator (not shown), a temperature setting switch, an operation switch, a lubricating switch, a hot switch, and the like. Have.

In the above-mentioned bath water heater, the controller 50 is provided with a controller for controlling the case where the water level does not reach the predetermined water level even after the preset hot water supply restriction time elapses from the start of hot water supply to the bathtub 2 to the predetermined water level. Abnormalities such as forgetting to close drain plugs
And an abnormality determination processing function of stopping the automatic hot water supply. Further, the function changeover switch 61 for selecting whether or not to activate this abnormality determination processing function is set to the bath remote control 60.
Or it includes the water heater the body.

When the function changeover switch 61 is in the ON state, the abnormality determination processing function operates, and when the function changeover switch 61 is in the OFF state, it does not operate. Furthermore, rather than simply deactivates the abnormality determination processing function, the hot water supply time limit normal
Hot water supply time limit and hot water supply time limit longer than the hot water supply time limit
(E.g., 2 times) to so that can switch selected and set to the
You may. In other words, by setting the hot water supply time limit to reach the predetermined water level longer than the normal hot water supply time limit ,
Oitedai capacity bathtub, it is possible to deal with low water pressure.

The switching of the functions is not limited to the switch type, but may be switched on the control board of the controller 50 by a jumper wire cut method or the like. Further, the operation may be switched by a combination operation of the operation switches of the bath remote controller 60 (for example, the lug switch and the attraction switch are simultaneously pressed for 3 seconds or more), and the switching state may be stored in the nonvolatile memory.

In the above configuration, the operation of the automatic hot water supply control of the automatic hot water supply apparatus of the present invention will be described with reference to the flowchart of FIG.

When supplying hot water to the bathtub 2, the bath remote control 60
After turning on the operation switch of and turning on the automatic hot water supply switch in step 100 after setting the hot water supply temperature,
The hot water supply unit 30 is activated to start a hot water supply operation to the bathtub 2, and the hot water from the hot water supply unit 30 is supplied to the bathtub 2 via the circulation heating unit 10 (step 101). Then, the operation shifts to the water level detection operation based on the signal of the pressure sensor 17 (step 10).
2) By judging the state of the function changeover switch 61, if the function changeover switch 61 is ON, a mode for judging a drainage plug abnormality is set, and if OFF, the function of canceling the abnormality judgment function is performed. Therefore, the changeover switch is OFF
If so, hot water is supplied until the set water level is reached regardless of the hot water supply time limit (steps 102 and 110). When the pressure sensor 17 detects that the set water level has been reached, automatic hot water supply is stopped (step 103). And bathtub temperature
Is determined to have reached the set temperature, and the circulation heating unit 10 is operated until the set temperature is reached to reheat (step 10).
5,106). Then, the boiling is notified and the operation is shifted to the heat keeping operation (steps 107 and 108).

On the other hand, if the function changeover switch 61 is ON, it is determined in parallel with the water level detection whether or not a predetermined hot water supply time limit has elapsed from the start of hot water supply (step 111). If the set water level is reached within the time limit, the process proceeds to step 103, and the above processing is performed. If the set water level is not reached even after the time limit, the automatic hot water supply is determined as a drain plug abnormality (drain plug is open). It stops and displays an abnormal message (step 112). After that, the automatic switch turns off
F is reset (step 113).

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. is there.

[0021]

According to the automatic hot water supply apparatus of the present invention, when a large-capacity bathtub is installed at the installation site or when the installation site has low water pressure, whether or not to activate the abnormality determination processing function is determined. It is possible to meet these conditions simply by switching and selecting the selection means to meet these conditions with a dedicated switching means, so that the hot water supply operation is erroneously determined during hot water supply and the hot water supply operation is stopped. There are no problems and it is easy to use.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a bath water heater to which the present invention is applied.

FIG. 2 is a flowchart illustrating an automatic hot water supply control routine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bath apparatus 2 Bathtub 10 Circulation heating part 30 Hot water supply part 11 Circulation path in a pot 50 Controller 60 Bath remote control 61 Switch

Claims (1)

(57) [Claims] 1. A Bei example abnormality determination processing function to stop the automatic hot water supply is determined even hot water time limit set from the start of the automatic hot water supply has elapsed abnormal if does not reach the predetermined water level, or
In the automatic hot water supply apparatus provided with selecting means for selecting whether or not to activate the abnormality determination processing function, the selecting means is installed at the installation site, and the hot water supply time limit is set.
Normal hot water supply time limit and hot water supply restriction longer than this hot water supply time limit
An automatic hot water supply device comprising a switching means for switching and selecting the time .