JP2003074971A - Hot and cold water mixing unit for water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an intermediate fault like the case that a performance of a mixing water sensor (33) is gradually lowered, in a hot and cold water mixing unit for a hot water comprising: a mixing water circuit (29) connected from a confluent point of a chilled water circuit (15) and a warm water circuit (14) to a connection port (18) of the heater and having the sensor (33); a hot and cold water mixer (20) for regulating a mixing ratio of the chilled water and the warm water at the point; a reference temperature setter for setting a reference temperature of the warm water to be discharged from the port (18); a mixer control means for controlling the mixer (20) so that a detected temperature of the sensor (33) becomes equal to the reference temperature; and a fault sensor for detecting a fault of the sensor to output a fault detection signal. SOLUTION: The hot and cold water mixing unit for the water heater comprises a fault monitoring sensor (34) provided separately from the sensor (33) in the mixing water circuit (29). The fault sensor outputs the fault detection signal when a threshold temperature set higher than the reference temperature is detected by the sensor (34).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply unit for connecting a hot water supply device utilizing natural energy such as a solar water heater or a hot water supply device utilizing various kinds of waste heat to a water heater. It is a thing.

[0002]

2. Description of the Related Art A solar water heater has a hot water supply system in which hot water of a desired temperature cannot be taken out due to weather conditions and the like, so that a water heater can be connected as an auxiliary heat source to make effective use of energy resources. As JP-A-10
There is known one having a structure as shown in FIG. 4 described in Japanese Patent Publication No. 196983.

The upstream hot water circuit (56) drawn out from the solar water heater (5) is connected to the hot water circuit (14) of the hot water mixing unit (1) for a water heater. Further, the water supply circuit (10) connected to the water supply is the cold water circuit (15) of the hot water mixing unit (1) for the water heater.
A hot and cold water mixer (20) is provided at the confluence of the cold water circuit (15) and the hot water circuit (14).
A mixed water temperature sensor (33) is arranged in the mixed water circuit (29) formed on the downstream side of the hot water mixer (20). The mixed water circuit (29) is connected to the water inlet (77) of the water heater (7) by piping, and the hot water supply device (7) supplies hot water to the tap (85) or the bathtub (81). Has become.

In this case, the remote controller (7) for the water heater (7)
When the hot water supply temperature is set in 1), the set temperature (hereinafter,
It is called "hot water set temperature". ) Is transmitted to the controller (11) of the hot water mixing unit (1) for a water heater. Then, the control device (11) controls the hot water mixer (20) to adjust the mixing ratio of the hot water from the solar water heater (5) and the cold water from the water supply circuit (10). Water temperature sensor
Match the temperature of the mixed water detected by (33) with the hot water supply set temperature. Then, the hot water of the hot water supply set temperature flowing out of the hot-water / water mixing unit (1) is supplied to the hot water tap (85) or the like via the water heater (7) maintained in the combustion stopped state.

Further, in the above, the mixed water temperature sensor (33)
In case of failure, the control device (11) outputs an operation signal for fully opening the water side to the hot water mixer (20), which prevents hot water from flowing out from the hot water mixer unit (1). In addition to the prevention, the remote controller (71) displays that the failure has occurred.

[0006]

However, in the above conventional device, the mixed water circuit (2) on the downstream side of the hot water mixer (20) is used.
9) has only a single mixed water temperature sensor (33). Therefore, in this device, even if the failure of the mixed water temperature sensor (33) can be detected as described above, the mixed water temperature sensor (33) can be detected.
Only faults such as disconnection or short circuit of (33) that produce extremely large or small output can be detected.
From this, in the above-mentioned conventional one, the mixed water temperature sensor (3
There is a problem that it is not possible to detect an intermediate failure that does not cause an extreme output fluctuation, such as when the performance of 3) gradually decreases.

The present invention has been made in view of the above points. "A cold water circuit having an upstream end serving as a water supply pipe connecting port connected to a water supply circuit and an upstream end through which hot water from a hot water supply device flows Mixing that is connected to the hot water circuit that is the hot water pipe connection port connected to the side hot water circuit, and that is connected to the water heater connection port on the downstream side from the confluence point where the cold water circuit and the hot water circuit merge and provided with a mixed water temperature sensor A water circuit, a hot and cold water mixer for adjusting the mixing ratio of the cold water and the hot water at the confluence point, a reference temperature setting device for setting a reference temperature of the hot water discharged from the water heater connection port, Mixer control means for controlling the hot water mixer so that the temperature detected by the mixed water temperature sensor becomes equal to the reference temperature, and an abnormality detection device for detecting an abnormality in the mixed water temperature sensor and outputting an abnormality detection signal. Hot water supply In use hot and cold water mixing unit ",
The object is to make it possible to detect an intermediate failure such as when the performance of the mixed water temperature sensor (33) gradually decreases.

[0008]

[Means for Solving the Problem] [1] The technical means of the present invention for solving the above-mentioned problem is to provide an abnormality monitoring sensor other than the mixed water temperature sensor in the mixed water circuit, The abnormality detection device outputs the abnormality detection signal when the abnormality monitoring sensor detects a threshold temperature set higher than the reference temperature ”. As the abnormality monitoring sensor, a switch such as a bimetal switch can be used in addition to the thermistor that outputs a signal corresponding to the detected temperature.

The above technical means operates as follows. When the hot water supply operation is started, the temperature detected by the mixed water temperature sensor is the reference temperature (the temperature of the hot water to be discharged from the water heater connection port to the water heater side) in the mixer control means, as in the conventional case.
Control the hot and cold water mixer to be equal to.

On the other hand, during operation of the hot and cold water mixing unit for the water heater, the mixed water temperature sensor causes an intermediate failure such as performance deterioration, which causes the temperature of the mixed water to be higher than the reference temperature set by the reference temperature setting device. When reaching, the abnormality monitoring sensor provided in the mixed water circuit detects the threshold temperature,
As a result, the abnormality detection signal is output from the abnormality detection device.

[2] In the above item 1, "The reference temperature setting device reads the hot water supply set temperature set by the hot water supply temperature setting device provided in the hot water supply device through a communication cable, and reads it. In the case of "set as temperature", the hot water supply set temperature set by the hot water supply temperature setting device provided in the hot water supply device is adopted as the reference temperature. Then, when hot water having a threshold temperature set higher than the reference temperature is detected by the abnormality monitoring sensor, the abnormality detecting device outputs an abnormality detection signal in response to the detection operation.

[3] In the above item 1, "the reference temperature setting device sets a reference temperature independent of the hot water supply temperature set by the hot water supply temperature setting device provided in the hot water supply device", For example, in the case of applying to a hot water supply temperature fixed type water heater in which the hot water supply set temperature is fixed, the reference temperature is matched with the hot water supply set temperature and used.

Then, when the mixed water temperature sensor is normal,
Hot water having the reference temperature equal to the fixed hot water supply set temperature is supplied to the water heater side from the water heater connection port. On the other hand, when the abnormality monitoring sensor detects that hot water having a threshold temperature higher than the reference temperature has begun to be supplied to the water heater side, the abnormality detection device outputs an abnormality signal.

[4] In the above items 1 to 3, "In the mixer control means after the abnormality detection signal is output, the temperature detected by the abnormality monitoring sensor becomes equal to the reference temperature. In controlling the hot water mixer, the hot water mixer is controlled based on the temperature detected by the abnormality monitoring sensor even after the abnormality detection signal is output from the abnormality detection device. The control of supplying the mixed water of the reference temperature to the water heater is provisionally executed.

Note that the item 4 is different from the item 1 described above, and a switch such as a bimetal switch cannot be used as an abnormality monitoring sensor. This is because it is necessary to control the hot and cold water mixer based on the temperature detected by the abnormality monitoring sensor after the abnormality detection signal is output.

[5] In order to detect an abnormality of the mixed water temperature sensor, "an abnormality monitoring sensor is provided in the mixed water circuit adjacent to the mixed water temperature sensor. The abnormality occurs when one of the detection temperatures of the mixed water temperature sensor and the abnormality monitoring sensor reaches the reference temperature and the other detection temperature does not reach the reference temperature within an allowable delay time. It is possible to output the detection signal.

In this device, one of the detection temperatures of the mixed water temperature sensor and the abnormality detection sensor reaches the reference temperature, and the other detection temperature becomes the reference temperature within an allowable delay time. When it reaches, it is determined that the mixed water temperature sensor and the abnormality monitoring sensor are in the normal state. On the other hand, if one detected temperature reaches the reference temperature and the other detected temperature does not reach the reference temperature within the allowable delay time, at least one of the mixed water temperature sensor and the abnormality monitoring sensor may be in an abnormal state. I understand. Therefore, in such a case, an abnormality signal is output from the abnormality monitoring device.

[6] In the above items 1 to 3 or 5,
In "a safety valve for opening and closing the hot water circuit is provided, and the safety valve is closed after the abnormality detection signal is output", the safety valve is closed when the abnormality detection signal is output, As a result, the hot water circuit through which hot water from the hot water supply device such as a solar water heater flows is cut off. Thereby, the hot water from the hot water supply device is not mixed with the cold water from the cold water circuit, and only the cold water is supplied to the water heater side. Therefore, after that, by the original function of the water heater,
The cold water is heated up to the set temperature for hot water supply and an appropriate hot water supply operation can be performed.

[7] In the above items 1 to 3 or 5,
"A portion located upstream of the hot water mixer in the middle of the cold water circuit, a bypass circuit connecting the mixed water circuit, and a bypass valve for maintaining the bypass circuit in a closed state are provided, In the one in which the bypass valve is opened after the abnormality detection signal is output '', the bypass valve is opened after the abnormality detection signal is output, thereby changing the cold water circuit to the mixed water circuit. A large amount of cold water flows in. As a result, the water in the mixed water circuit whose temperature has been lowered is supplied to the water heater side, and the water is heated to the hot water supply set temperature by the water heater.

[8] In the item 5 above, "The mixer control means after the abnormality detection signal has been output has a temperature detected by a mixing water temperature sensor or an abnormality monitoring sensor that outputs the one detection temperature. The hot water mixer is controlled so as to be equal to the reference temperature '', even after the abnormality detection signal is output from the abnormality detection device, the abnormality detection sensor or the mixed water temperature sensor that has detected the reference temperature first. Determines that the temperature is normal, and controls the hot and cold water mixer based on the temperature detected by the sensor determined to be normal. Thereby, thereafter, the control of supplying the mixed water having the reference temperature to the water heater is provisionally executed.

[9] In the above items 1 to 8, "in which an abnormality is displayed on the display in response to the abnormality detection signal", by displaying an abnormal state on the display,
It can raise the need for repairs and inspections.

When the water heater connected to the hot and cold water mixing unit for hot water supply of the present invention is equipped with a remote controller for remote operation, the indicator provided on the remote controller is used as the indicator. However, in the case of a hot water supply type hot water supply device that does not include the remote controller, the display device may be provided in the hot and cold water mixing unit for the hot water supply device.

[0023]

The present invention, having the above-mentioned structure, has the following unique effects. Since the abnormality of the mixed water temperature sensor is judged based on the output of the abnormality monitoring sensor, it is possible to detect an intermediate failure in which the performance of the mixed water temperature sensor gradually deteriorates.

In the second item, the threshold temperature determined based on the hot water supply set temperature set by the hot water supply temperature setting device provided in the hot water supply device is compared with the temperature detected by the abnormality monitoring sensor. Therefore, the abnormality can be detected early before the hot water extremely hotter than the hot water supply set temperature is discharged from the hot water mixer.

The item (3) can be applied to a hot water heater of a fixed hot water temperature by appropriately setting the reference temperature. According to the items 4 and 8, the mixed water of the cold water and the hot water from the hot water supply device can be provisionally supplied to the water heater even after the abnormality detection signal is output. You can use hot water. Even after the output of the abnormality detection signal, the hot and cold water mixing unit for the water heater can be safely operated by utilizing the output of the abnormality monitoring sensor or the mixed water temperature sensor.

In the items 6 and 7, since the temperature of the water supplied from the mixed water circuit to the water heater does not rise to a high temperature, high temperature water does not flow out from the water heater and a safe hot water supply operation can be secured. As described above, with the item of item 9, the necessity of repairing / inspecting the hot and cold water mixing unit for the water heater can be raised.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the present invention described above will be described in detail with reference to the drawings. 1ST EMBODIMENT FIG. 1: is a conceptual diagram of the hot water supply system using the hot water / water mixing unit (1) for water heaters which concerns on embodiment of this invention, and a solar water heater (5) is a hot water / water mixing unit for water heaters. It is pipe-connected to the water heater (7) via 1). Less than,
Details of each part will be described. [About solar water heater (5)] The solar water heater (5) includes a heat storage pipe (52) formed so as to circulate between a heat collector (50) that absorbs solar heat and a hot water storage tank (51). The heat storage pipe (52) is provided with an expansion tank (53) and a circulation pump (54).

Further, the bottom of the hot water storage tank (51) is connected to a water supply pipe (55) for solar water for supplying cold water from a water pipe and a drain circuit (58) having a drain plug (57), An upstream hot water circuit (56) is drawn out from the top of the hot water storage tank (51).

[About the water heater (7)] The water heater (7) is electrically connected to the water heater body (70) having a built-in heat exchanger heated by a gas burner (not shown), and the water heater body (70). The remote controller (71) is provided with an operation switch (72), a water filling switch (73) operated when filling the bathtub (81) with hot water, and a hot water supply temperature setting device. (75) and a display section (74) for displaying the operating state of the water heater and the like.

Further, between the water heater body (70) and the bathtub (81),
Outgoing pipe (82) and return pipe (83) used for filling and reheating
In addition, the hot water supply circuit (84) drawn from the water heater main body (70) is further provided with a hot water outlet faucet (85).

[About hot-water mixing unit for water heater (1)]
The hot and cold water mixing unit (1) for a water heater as an object of the present invention,
The hot water pipe connection port (16) to which the upstream hot water circuit (56) in which hot water from the solar water heater (5) flows is connected, and the water supply circuit (10) branched from the above-mentioned solar water supply pipe (55). The water supply pipe connection port (17) to be connected, and the water inlet (7
A water heater connection port (18) connected to 7) is provided.

The hot water circuit (14) formed on the downstream side of the hot water pipe connection port (16) has a vacuum breaker (120),
The normally closed solenoid valve (31), which is a safety valve, the check valve (13), and the hot water temperature sensor (19) are arranged in this order from the upstream side. In addition, near the upstream end of the hot water circuit (14), a water drain plug that has both the function of removing dust in the water flow and the function of draining the circuit
(21) is provided.

On the other hand, in the cold water circuit (15), the check valve (22), the feed water temperature sensor (23) and the hot water mixer (20) are arranged in this order, and the hot water mixer ( 20) is the hot water circuit (14)
And a cold water control valve (25) arranged at the confluence of the cold water circuit (15) and a cold water control valve (24) arranged in the cold water circuit (15) on the upstream side. . Then, the cold water control valve (24) and the hot water control valve (25), the corresponding pulse motor (240) (250) by the rotation of the tip valve body (241) (251) valve opening (26) ( 27), which results in valve openings (26) (27)
The flow rate is adjusted by changing the opening degree of.

The mixed water circuit (29) is provided with a water amount sensor (32) for measuring the flow rate of the mixed water, a mixed water temperature sensor (33), an abnormality monitoring sensor (34) and a water drain plug (35). Has been
The water drain plug (35) also has a relief valve function of opening the valve by opening the valve when the water pressure in the mixed water circuit (29) or the like rises excessively. Further, near the upstream end of the cold water circuit (15), a water drain plug (30) having both a dust removing function and a draining function for water passage is provided.

Then, the hot water temperature sensor (19), the water supply temperature sensor (23), the hot water mixer (20), the normally closed solenoid valve (31), the water amount sensor
Electrical components such as (32), mixed water temperature sensor (33) and abnormality monitoring sensor (34) are electrically connected to the control device (11), and the control device (11) operates the hot and cold water mixer (20). Are controlled.

[Actual Operation of Hot Water Supply] Next, the operation of the hot water supply system will be described. The control device (11) incorporated in the hot and cold water mixing unit (1) for a water heater stores a microcomputer that executes the control operation of the content shown in the flowchart of FIG. 2, and hereinafter, the hot water supply according to the present embodiment will be described. The operation of the system will be described according to the flowchart of FIG.

First, a signal indicating whether or not the operation switch (72) provided on the remote controller (71) of the water heater (7) is operated is supplied from the water heater body (70) via the communication cable (79). The transmission to the control device (11) of the dexterous hot and cold water mixing unit (1) is monitored in step (ST1).

Next, the flow rate Q of the mixed water detected by the water quantity sensor (32) is the base flow rate (in this embodiment, 2 liter /
Minutes) is determined in step (ST2). Then, when the mixed water of the flow rate Q exceeding the base flow rate is flowing by opening the hot water tap (85) or turning on the hot water filling switch (73), the normally closed solenoid valve (31) is opened in step (ST3). Let me speak.

Next, the hot water supply set temperature set by the hot water supply temperature setting device (75) of the remote controller (71) of the hot water supply device (7) is the communication cable.
Step (ST) based on the hot water supply set temperature (corresponding to the reference temperature described in the above item 1) that is read into the microcomputer of the control device (11) via (79).
4) to step (ST6) are executed. As a result, the opening degree of the cold water control valve (24) or the hot water control valve (25) of the hot water mixer (20) is adjusted so that the temperature of the mixed water mixed in the hot water mixer (20) reaches the hot water supply set temperature. Adjusted. Specifically, the hot water mixer (2
The temperature of the mixed water flowing out from (0) is monitored by the mixed water temperature sensor (33), and if the temperature detected by the mixed water temperature sensor (33) exceeds the hot water supply set temperature, the hot water circuit (14) is used in step (ST6). The openings of the cold water control valve (24) and the hot water control valve (25) are adjusted so that the mixing ratio of the hot water is reduced. Also, mixed water temperature sensor
If the detected temperature of (33) is lower than the hot water supply set temperature above, the cold water control valve (24) and the hot water control valve (25) are adjusted so that the mixing ratio of the hot water from the hot water circuit (14) increases in step (ST5). The opening is adjusted.

In this embodiment, the above step (ST
The functional unit of the microcomputer that executes the control of 4) to step (ST6) corresponds to the mixer control means described in the above item 1. Further, the functional portion of the microcomputer that stores the hot water supply set temperature that is the reference temperature corresponds to the above-mentioned reference temperature setting device.

Next, in step (ST7), the abnormality monitoring sensor (3
It is determined whether or not the detected temperature of 4) is equal to or lower than the threshold temperature set 10 deg higher than the hot water supply set temperature, and if it is equal to or lower than the threshold temperature, the control operation is returned to step (ST4).

On the other hand, if the temperature detected by the abnormality monitoring sensor (34) exceeds the threshold temperature when the step (ST7) is executed, the mixed water temperature sensor (33) may be in an abnormal state. So, in this case, the mixed water temperature sensor (33)
It is considered as a failure. Then, in step (ST8), the normally closed solenoid valve
(31) is closed to shut off the hot water supplied from the upstream hot water circuit (56), and the hot and cold water mixer (20) is fed in step (ST9).
Maximize the opening of the cold water control valve (24). Thereby, the cold water flowing through the cold water circuit (15) is directly supplied to the water heater (7) without being mixed with the hot water, and the cold water is supplied to the hot water temperature setting device (75) by the original function of the water heater (7). ) The hot water supply temperature set in () is added to the hot water tap (85) or bathtub (81)
Is supplied to.

In step (ST10), an abnormality is displayed on the display section (74) of the remote controller (71) to notify the water heater user that the mixed water temperature sensor (33) is out of order. . As described above, in the hot water supply system, it is possible to perform the abnormality display and avoid the risk of hot water being supplied to the water heater (7). In the present embodiment, the functional unit of the microcomputer that executes the step (ST7) of determining whether the temperature detected by the abnormality monitoring sensor (34) exceeds the threshold temperature corresponds to the abnormality detecting device described above.

In the above embodiment, step (ST7)
If a failure of the mixed water temperature sensor (33) is detected in, the hot water from the solar water heater (5) is shut off and only the cold water from the water supply circuit (10) is supplied to the water heater (7). However, when a failure of the mixed water temperature sensor (33) is detected in step (ST7), the mixed water temperature sensor (33) and the abnormality monitoring sensor (34) are further added.
If the temperature difference between the detected temperatures of the remote controller (71) is more than a certain value, the remote controller (71) displays the abnormality (74) while displaying the abnormality based on the detected temperature of the abnormality monitoring sensor (34). The hot water mixer (20) may be controlled. That is, the hot water mixer (20) is controlled so that the detected temperature of the abnormality monitoring sensor (34) becomes equal to the hot water supply set temperature set by the hot water supply temperature setting device (75) of the remote controller (71), and the display unit The error is displayed on (74). By doing this, even if the mixed water temperature sensor (33) fails, the solar water heater will
There is an advantage that the hot water supply operation can be temporarily continued while supplying the hot water of (5) to the hot water supply device (7).

In the above embodiment, step (ST7)
The temperature detected by the abnormality monitoring sensor (34) is 1 above the hot water supply set temperature.
When the temperature exceeds the threshold temperature of 0 deg, the mixed water temperature sensor (3
I decided to judge it as a failure of 3). That is, the threshold temperature was set to a value 10 deg higher than the hot water supply set temperature. But,
The threshold temperature does not necessarily have to be set to the above value. For example, a reference temperature that is independent of the hot water supply set temperature set by the hot water supply temperature setting device (75) of the remote controller (71) is stored in the memory of the microcomputer as the reference temperature setting device and is higher than the reference temperature (for example, , 60 ° C.) may be adopted as the threshold temperature. According to this structure, the hot / water mixing unit for a hot water supply device is suitable for being applied to a hot water supply type hot water supply device having a fixed hot water supply temperature. With this configuration, for example, the reference temperature is made to coincide with the fixed hot water supply set temperature, and the hot water mixing unit for hot water supply is provided with an abnormality indicator such as an alarm lamp for use. When used in this way, the mixed water temperature sensor (3
If 3) is normal, while the hot water mixer (20) is controlled so that the hot water having the reference temperature equal to the fixed hot water supply set temperature flows out of the hot water mixer (20), the threshold temperature When the abnormality monitoring sensor (34) detects that hot water has started to flow out from the hot water mixer (20), it causes an alarm lamp as an abnormality indicator to emit light. When the information lamp is turned on, the normally closed solenoid valve (31) is closed and only cold water is supplied to the water heater (7), or hot and cold water mixing is performed based on the temperature detected by the abnormality monitoring sensor (34). Control the vessel (20).

In the above embodiment, step (ST7)
If the temperature detected by the abnormality monitoring sensor (34) exceeds the threshold temperature when is executed, the normally closed solenoid valve (31) is kept closed in step (ST8). On the other hand, as shown by an imaginary line in FIG. 1, a portion of the cold water circuit (15) located upstream of the hot water mixer (20) and the mixed water circuit (29).
A bypass circuit (100) for connecting the bypass circuit (100) and a bypass valve (101) for opening and closing the bypass circuit (100) are provided in place of the normally closed solenoid valve (31), and the bypass valve (101) is normally closed. It may be maintained in the open state and may be maintained in the open state when the step (ST8) is executed. And
When the bypass valve (101) is opened, a large amount of cold water flows from the cold water circuit (15) to the mixed water circuit (29) regardless of the opening degree of the cold water control valve (24) or the hot water control valve (25). The water that flows in and has a safe temperature (a temperature at which there is no concern about burns) is supplied to the water heater (7) side.

Second Embodiment Next, a second embodiment of the present invention will be described. The hot water supply system incorporating the hot and cold water mixing unit for the hot water supply device according to the present embodiment has the same water piping and electric wiring as in FIG. Next, the operation of the hot and cold water mixing unit for the water heater according to the present embodiment will be described based on the flowchart of FIG.

The same control as the steps (ST1) to (ST3) in FIG. 2 described above is executed in steps (ST30) to (ST32). That is, when it is confirmed that the operation switch (72) is turned on in step (ST30), it is determined in step (ST31) whether the detected flow rate Q of the flow rate sensor (32) exceeds the base flow rate, and further, the base flow rate. If it exceeds, the normally closed solenoid valve (31) is opened in step (ST32).

Next, in step (ST33), the mixed water temperature sensor (3
When it is determined that the detected temperature in 3) is higher than the hot water supply set temperature set by the hot water supply temperature setting device (75) of the remote controller (71), control is performed to lower the detected temperature to the hot water supply set temperature.
Specifically, in step (ST34), the hot water mixer (20) is controlled so as to reduce the mixing ratio of the hot water supplied from the solar water heater (5) by a fixed ratio. Next, the abnormality monitoring sensor (3
If the detected temperature in 4) is below the hot water supply set temperature, the process proceeds from step (ST35) to step (ST36) to set the content of the first abnormality determination flag F1 to "OK", while the abnormality monitoring sensor (34)
If the detected temperature is higher than the hot water set temperature, step (ST3
In step 7), the content of the first abnormality determination flag F1 is set to "NG".

Thereafter, in step (ST38), a waiting time of 1 second which is the above-mentioned allowable delay time is executed, and in step (ST39), if the temperature detected by the mixed water temperature sensor (33) is below the hot water supply set temperature, step While proceeding to (ST40) and setting the content of the second abnormality determination flag F2 to "OK", if the temperature detected by the mixed water temperature sensor (33) is higher than the hot water supply set temperature, the second abnormality determination flag F2 is determined in step (ST41). Is set to "NG".

When it is confirmed in step (ST42) that the contents of the first abnormality determination flag F1 and the second abnormality determination flag F2 do not match, that is, the abnormality monitoring sensor (34)
1 which is the allowable delay time after detecting the hot water supply set temperature
If it can be confirmed that the mixed water temperature sensor (33) does not detect the hot water supply set temperature within the second, the mixed water temperature sensor (33) may be out of order. ) To close the normally closed solenoid valve (31), set the cold water control valve (24) of the hot water mixer (20) to the maximum opening, and also display an error on the display (74) of the remote control (71). To perform.

On the other hand, in the above-mentioned step (ST33), the temperature detected by the mixed water temperature sensor (33) is changed to the hot water supply temperature setting device of the remote controller (71).
When it is determined that the temperature is not higher than the hot water supply set temperature set in (75), the temperature detected by the mixed water temperature sensor (33) is compared with the hot water supply set temperature in step (ST50). Then, if the temperature detected by the mixed water temperature sensor (33) is lower than the hot water supply set temperature, the mixing ratio of the warm water in the mixed water is increased by a fixed ratio in step (ST51), and then steps (ST52) to step (ST58).
And step (ST42) are executed to determine whether the mixed water temperature sensor (33) detects the hot water supply set temperature within 1 second after the abnormality monitoring sensor (34) detects the hot water supply set temperature. To do. If the mixed water temperature sensor (33) does not detect the hot water supply set temperature within the above 1 second, step (S
Only cold water is supplied to the water heater (7) at T43), and an abnormality is displayed on the display section (74) of the remote controller (71) at step (ST44).

Further, in the above-mentioned step (ST50), the temperature detected by the mixed water temperature sensor (33) is not lower than the hot water supply set temperature (the detected temperature of the mixed water temperature sensor (33) is equal to the hot water supply set temperature).
If the temperature detected by the abnormality monitoring sensor (34) does not match the hot water supply set temperature in step (ST60) after waiting for 1 second in step (ST59), the mixed water temperature Since the sensor (33) has detected the hot water supply set temperature before the abnormality monitoring sensor (34), it is determined that an abnormality has occurred and the above-described steps (ST43) and (ST44) are executed in this case as well.

In the second embodiment, the step (ST4
If it is determined that an abnormality has occurred in step 2), step (ST43).
Although only the cold water from the water supply circuit (10) was supplied to the water heater (7) in the above, when it is judged that the above abnormality has occurred, the mixed water temperature sensor (33) and the abnormality monitoring sensor (34) are further detected. Judge the temperature difference of the detected temperature, and if the temperature difference is a certain value or more, the hot and cold water mixer based on the detection temperature of the abnormality monitoring sensor (34) or the mixed water temperature sensor (33) that detected the hot water supply set temperature first.
(20) may be controlled, and an anomaly may be displayed on the display unit such as the remote controller (71). That is, the abnormality monitoring sensor (3
4) Or the temperature detected by the mixed water temperature sensor (33) is the hot water temperature setting device.
The hot and cold water mixer (20) is controlled so as to be equal to the hot water supply set temperature (corresponding to the reference temperature of the above-mentioned item 5) set in (75), and the display section displays an abnormality. By doing so, even if the mixed water temperature sensor (33) or the like fails, the hot water supply operation is temporarily continued safely while supplying the hot water from the solar water heater (5) to the water heater (7). There is an advantage that can be made.

In the second embodiment, the step (S
T42), the first abnormality determination flag F1 and the second abnormality determination flag
If it is confirmed that the contents of F2 do not match, there is a possibility that the mixed water temperature sensor (33) has failed, so in step (ST43) the normally closed solenoid valve (31) Was closed. On the other hand, as shown by an imaginary line in FIG. 1, a bypass circuit that connects the portion of the cold water circuit (15) located upstream of the hot water mixer (20) and the mixed water circuit (29).
(100) is provided, a bypass valve (101) for opening and closing the bypass circuit (100) is provided in place of the normally closed solenoid valve (31), and the bypass valve (101) is normally maintained in a closed state. Alternatively, the open state may be maintained when the above step (ST43) is executed. When the bypass valve (101) is opened, a large amount of cold water flows from the cold water circuit (15) to the mixed water circuit (29) regardless of the opening degree of the cold water control valve (24) or the hot water control valve (25). ) And water at a safe temperature (a temperature at which there is no risk of burns) is supplied to the water heater (7) side. still,
As the hot water supply device, in addition to the above-described solar water heater (5) that uses natural energy, a hot water supply device that uses various kinds of waste heat can be applied.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a hot water supply system illustrating an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the hot and cold water mixing unit (1) for the water heater according to the first embodiment of the present invention.

FIG. 3 is an operation explanatory view of the hot and cold water mixing unit (1) for the water heater according to the second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

(1) ・ ・ ・ Hot water mixing unit for water heater (5) ... Solar water heater (7) ・ ・ ・ Water heater (14) ・ ・ ・ Hot water circuit (15) ・ ・ ・ Cold water circuit (19) ・ ・ ・ Hot water temperature sensor (20) ・ ・ ・ Hot water mixer (29) ・ ・ ・ Mixed water circuit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masakazu Ando             Rinnai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi             Within the corporation (72) Inventor Yukihiro Suzuki             Rinnai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi             Within the corporation

Claims (9)

[Claims] 1. A cold water circuit having an upstream end serving as a water supply pipe connection port connected to a water supply circuit, and an upstream end serving as a hot water pipe connection port connected to an upstream hot water circuit through which hot water from a hot water supply device flows. Hot water circuit, a mixed water circuit connected to the water heater connection port on the downstream side from the confluence point where the cold water circuit and the hot water circuit merge, and the cold water at the confluence point A hot and cold water mixer for adjusting the mixing ratio with hot water, a reference temperature setter for setting a reference temperature of hot water discharged from the water heater connection port, and a detection temperature of the mixed water temperature sensor becomes equal to the reference temperature In the hot and cold water mixing unit for a water heater, which comprises a mixer control means for controlling the hot water mixer as described above, and an abnormality detection device for detecting an abnormality of the mixed water temperature sensor and outputting an abnormality detection signal, The water circuit is provided with an abnormality monitoring sensor different from the mixed water temperature sensor, and the abnormality detection device outputs the abnormality detection signal when the abnormality monitoring sensor detects a threshold temperature set higher than the reference temperature. A hot and cold water mixing unit for water heaters. 2. The hot water mixing unit for a hot water supply device according to claim 1, wherein the reference temperature setting device reads a hot water supply set temperature set by a hot water supply temperature setting device provided in the hot water supply device through a communication cable. A hot water mixing unit for a water heater, which uses the temperature as the reference temperature. 3. The hot / water mixing unit for a hot water supply device according to claim 1, wherein the reference temperature setting device sets a reference temperature that is independent of a hot water supply setting temperature set by a hot water supply temperature setting device provided in the hot water supply device. A hot and cold water mixing unit for water heaters. 4. The hot and cold water mixing unit for a water heater according to any one of claims 1 to 3, wherein the mixer control means after the abnormality detection signal is output is detected by the abnormality monitoring sensor. A hot and cold water mixing unit for a water heater, which controls the hot and cold water mixer so that the temperature becomes equal to the reference temperature. 5. A cold water circuit having an upstream end serving as a water supply pipe connection port connected to a water supply circuit, and an upstream end serving as a hot water pipe connection port connected to an upstream hot water circuit through which hot water from a hot water supply device flows. Hot water circuit, a mixed water circuit connected to the water heater connection port on the downstream side from the confluence point where the cold water circuit and the hot water circuit merge, and the cold water at the confluence point A hot and cold water mixer for adjusting the mixing ratio with hot water, a reference temperature setter for setting a reference temperature of hot water discharged from the water heater connection port, and a detection temperature of the mixed water temperature sensor becomes equal to the reference temperature In the hot and cold water mixing unit for a water heater, which comprises a mixer control means for controlling the hot water mixer as described above, and an abnormality detection device for detecting an abnormality of the mixed water temperature sensor and outputting an abnormality detection signal, In the water circuit, an abnormality monitoring sensor is arranged adjacent to the mixed water temperature sensor, and the abnormality detection device detects one of the detected temperatures of the mixed water temperature sensor and the abnormality monitoring sensor. A hot and cold water mixing unit for a water heater, which outputs the abnormality detection signal when the other detected temperature does not reach the reference temperature within an allowable delay time after reaching the reference temperature. 6. The hot and cold water mixing unit for a water heater according to claim 1, wherein a safety valve for opening and closing the hot water circuit is provided, and the abnormality detection signal is output. The hot water mixing unit for a water heater, in which the safety valve is closed after the operation. 7. The hot / water mixing unit for a water heater according to any one of claims 1 to 3 or 5, wherein the portion is located on the upstream side of the hot / water mixer in the middle of the cold water circuit. And a bypass circuit connecting the mixed water circuit and a bypass valve for maintaining the bypass circuit in a closed state, and the bypass valve is opened after the abnormality detection signal is output. A dexterous water mixing unit. 8. The hot and cold water mixing unit for a water heater according to claim 5, wherein the mixer control means after the abnormality detection signal is output is a mixed water temperature sensor or an abnormality that outputs the one of the detected temperatures. A hot and cold water mixing unit for a water heater, which controls the hot and cold water mixer so that the temperature detected by the monitoring sensor becomes equal to the reference temperature. 9. The hot water / water mixing unit for a water heater according to any one of claims 1 to 8, wherein an abnormality is displayed on a display in response to the abnormality detection signal.