JP3728243B2 - Hot water mixing unit for water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply unit for connecting a hot water supply device using natural energy, such as a solar water heater, or a hot water supply device using various types of waste heat to a water heater.
[0002]
[Prior art]
Solar water heaters include a hot water supply system in which hot water at a target temperature cannot be taken out due to the weather or the like, so that a hot water heater can be connected as an auxiliary heat source so that energy resources can be used effectively. The one described in Japanese Patent No. 325558 is known.
[0003]
This has the schematic structure shown in FIG. 3, and the upstream hot water passage 56 drawn out from the solar water heater 5 is connected to the hot water passage 14 of the hot water mixing unit 1 for hot water heater. The water supply passage 10 connected to the water supply is connected to the cold water passage 15 of the hot water mixing unit 1 for the hot water heater, and a hot water mixer 20 is disposed at the junction of the cold water passage 15 and the hot water passage 14. . The hot water passage 14 and the cold water passage 15 are provided with a hot water temperature sensor 19 and a feed water temperature sensor 23, respectively. A mixed water temperature sensor 33 is provided in the mixed water passage 29 formed on the downstream side of the hot water / water mixer 20.
[0004]
The mixed water passage 29 is connected to a water inlet 77 of the water heater 7 by piping, and hot water is supplied from the water heater 7 to the hot water tap 85 and the bathtub 81.
In this case, when the hot water supply temperature is set by the remote controller 71 for the hot water heater 7, the set hot water temperature (hereinafter referred to as “set hot water temperature”) is transmitted to the control device 11 of the hot water mixing unit 1 for the hot water heater. . Then, for example, when a water flow is generated in the water passage in the water heater 7 due to the opening of the tap tap 85, the hot water mixer 20 of the hot water mixing unit 1 for the water heater starts to be controlled by the water flow detection signal output from the water heater 7. In other words, the hot water mixer 20 is subjected to feedforward control and feedback control based on the outputs of the mixed water temperature sensor 33, the hot water temperature sensor 19, the feed water temperature sensor 23, and the output of the flow rate sensor in the hot water heater 7. The temperature of the mixed water flowing out of the mixer 20 is adjusted to the set hot water supply temperature. Then, the mixed water flowing out from the hot water mixing unit 1 for hot water heater is supplied to the hot water tap 85 and the like through the hot water heater 7 maintained in the combustion stopped state.
[0005]
Moreover, in the above, when the upstream hot water passage 56 freezes or the user intentionally closes the solar cock 59 so that the upstream hot water passage 56 is stopped from flowing, the hot water / water mixer 20 flows out. It is detected that the fluctuation of the flow rate of the mixed water is repeated, and thereby the hot water mixer 20 is controlled to fix the cold water passage 15 side in the open state. Specifically, when the upstream side hot water passage 56 is stopped to flow due to freezing or the like, the detected temperature of the mixed water temperature sensor 33 does not rise to the set hot water supply temperature, so the hot water mixer 20 increases the mixing ratio of hot water. In order to do so, the opening degree on the warm water passage 14 side is increased to the maximum opening degree. However, even in this case, the temperature detected by the mixed water temperature sensor 33 does not rise to the set hot water supply temperature, so that the hot water / water mixer 20 gradually narrows the opening degree on the cold water passage 15 side. Then, finally, the flow rate of the mixed water passage 29 becomes extremely small and the water flow detection signal output from the water heater 7 disappears. Therefore, the control device 11 determines that the hot water tap 85 is closed, and the hot water is supplied. The mixer 20 is returned to the initial state. That is, the hot water / water mixer 20 is returned to the state where the opening degree on the cold water passage 15 side is maximized and the opening degree on the hot water passage 14 side is minimized.
[0006]
Then, since the cold water from the cold water passage 15 having the maximum opening is supplied again to the water heater 7 side, the water flow detection signal described above is output again, thereby increasing the opening of the hot water passage 14 described above. And the control for narrowing the cold water passage 15 are resumed, and finally the hot and cold water mixer 20 returns to the initial state again.
[0007]
Then, when the flow rate of the mixed water flowing out of the water heater 7 is repeatedly changed by repeating the above control, the repeated flow rate fluctuation is detected and the number of repetitions is counted, and when the count number reaches a predetermined number, This is determined that the upstream hot water passage 56 is in a water flow stop state, and the cold water passage 15 side is fixed to the open state by the hot water mixer 20 of the hot water mixing unit 1 for the hot water heater.
[0008]
[Problems to be solved by the invention]
However, in the hot water mixing unit 1 for hot water heaters incorporated in the hot water system, the flow rate of the mixed water flowing out of the hot water heater 7 is detected to change repeatedly, and the cold water passage 15 is fixed in the open state. Until the operation of detecting the fluctuation is completed, the flow rate of the mixed water hunts, and there is a problem that the user of the hot water flowing out from the tap tap 85 is uncomfortable.
[0009]
The present invention has been made in view of the above points.
“A cold water passage that serves as a water supply pipe connection port connected to a water supply passage through which cold water flows at the upstream end;
A hot water passage serving as a hot water pipe connection port connected to an upstream hot water passage through which an upstream end flows hot water from a hot water supply device;
A mixed water passage that is connected to a downstream water heater connection port from a junction where the cold water passage and the hot water passage merge, and is provided with a mixed water temperature sensor;
The mixing ratio of the cold water and the hot water at the junction is adjusted by adjusting the opening of the cold water passage and the opening of the hot water passage so that the detected temperature of the mixed water temperature sensor becomes a set temperature. In a hot water / water mixing unit for a hot water heater that includes a hot water / water mixer that performs a temperature control operation, the flow stop state of the upstream hot water passage is detected immediately before the flow rate of the mixed water flowing out of the water heater hunts. The problem is to switch to the operation of supplying cold water from the cold water passage.
[0010]
[Means for Solving the Problems]
[1]
The technical means of the present invention for solving the above problems are as follows:
“When the hot water / water mixer performs the temperature control operation to set the opening of the hot water passage to the maximum and the opening of the cold water passage to the minimum, the flow rate of the mixing water passage is set to the first criterion. When the flow rate becomes lower than the flow rate, a control means for fixing the cold water passage to the first set opening by the hot water / water mixer ”is provided.
[0011]
According to the above technical means, when the upstream hot water passage is in a water flow stop state, the mixed water does not flow to the mixed water passage of the hot water mixing unit for hot water heater that is the subject of the present invention, so the temperature of the mixed water The detection temperature of the mixed water temperature sensor for detecting the temperature does not increase. Therefore, the hot water / water mixer maximizes the opening of the hot water passage and minimizes the opening of the cold water passage so as to increase the temperature of the mixed water. At this time, when the flow rate of the mixed water passage is equal to or lower than the first determination reference flow rate, it is determined that the upstream hot water passage is in a water flow stop state, and the cold water passage is set to the first set opening by the hot water / water mixer. Fix it.
Then, the cold water from the cold water passage fixed to the first set opening is supplied from the hot water mixer to the hot water heater, heated by the hot water heater, and discharged from the hot water tap or the like.
[0012]
As described above, according to the above technical means, when the flow rate of the mixed water passage is equal to or lower than the first determination reference flow rate, the cold water passage is fixed at the first set opening degree. , Hunting of the flow rate of hot water flowing out from the water heater connected to the hot water mixing unit for water heater can be prevented.
[0013]
Whether or not the mixed water passage is in a water flow state may be determined based on a signal from the flow sensor provided with a flow rate sensor for detecting the presence or absence of water flow in the mixed water passage. You may judge based on the signal of the flow sensor provided in the water flow path in the water heater connected to the hot water mixing unit for water heaters which is the object of the invention.
Further, the “first set opening degree” may not be the maximum opening degree but may be a half-opening degree or a lower opening degree if there is no problem with the hot water supply operation of the water heater.
[0014]
[2]
“As a result of setting the opening degree of the hot water passage to the maximum and setting the opening degree of the cold water passage to the minimum by the hot water / water mixer executing the temperature control operation, the flow rate of the mixing water passage is determined as a second determination. In the case of having a control means for fixing the cold water passage to the first set opening degree by the hot water / water mixer when the flow rate becomes lower than the reference flow rate ”, as in the above item 1, the upstream hot water passage is in water flow. In the stop state, the hot water mixer maximizes the opening of the hot water passage and minimizes the opening of the cold water passage so as to increase the temperature of the mixed water. As a result, if the flow rate of the mixed water passage is equal to or less than the second determination reference flow rate, it is determined that the upstream hot water passage is in a water flow stop state, and the cold water passage is set to the first set opening by the hot water / water mixer. Since it is fixed, it is possible to prevent hunting of the flow rate of the hot water flowing out from the water heater connected to the hot water mixing unit for the water heater while detecting the water stoppage state of the upstream hot water passage.
[0015]
In addition, when the opening of the hot water passage is set to the maximum and the opening of the cold water passage is set to the minimum, and the flow rate of the mixed water passage is equal to or lower than the second determination reference flow rate, the upstream hot water passage Therefore, when hot water can be normally supplied and normal temperature control operation is performed (the opening degree of the hot water passage is maximum and the cold water passage is opened). When the degree is not set to the minimum), the user stops the water flow even if the flow rate of the mixed water passage is lower than the second judgment reference flow rate by reducing the amount of mixed water used. Therefore, the cold water passage is not fixed at the first set opening degree.
[0016]
[3]
In the above item 1 or 2,
“When the cold water passage is fixed at the first set opening, the hot water passage is fixed at the second set opening by the hot water mixer, and then the detected temperature of the mixed water temperature sensor becomes equal to or higher than the return determination reference temperature. If the control means for adjusting the mixing ratio by the hot water / water mixer so that the detected temperature of the mixed water temperature sensor becomes the set temperature ”, the upstream side hot water passage is in a water flow stop state. When the flow rate of the mixed water passage becomes equal to or less than the determination reference flow rate, the cold water passage is fixed at the first set opening and the hot water passage is fixed at the second set opening. Then, when the cause of the stoppage of the upstream hot water passage such as freezing has been solved, the upstream hot water passage returns to the water passing state, and the hot water is supplied from the upstream hot water passage to the mixed water passage to thereby detect the mixed water temperature sensor. Normal temperature control to obtain mixed water at the set temperature by adjusting the mixing ratio of hot water from the hot water passage and cold water from the cold water passage with a hot water mixer Operation resumes.
[0017]
The “second set opening” is not limited to a minute opening as long as the warm water is supplied from the upstream hot water passage to the mixed water passage when the cause of the stoppage of water flow is resolved. , Half open or maximum opening.
The “return determination reference temperature” may be a temperature obtained by adding a constant to the temperature detected by the feed water temperature sensor, or may be the set temperature.
[0018]
[Section 4]
In any one of items 1 to 3,
“When the water flow through the mixed water passage is stopped after the cold water passage is fixed at the first set opening, the cold water passage and the hot water passage are set to a safe temperature mixed opening by the hot water mixer. If the cold water passage is fixed at the first set opening degree, the hot water from the tap tap is stopped and the water flow through the mixed water passage is stopped. Since the cold water passage and the hot water passage are set at a safe temperature mixing opening, when the cause of the water stop has already been eliminated when the hot water is started again, the mixing ratio of the hot water can be kept low. Thus, the normal control operation is resumed without the hot mixed water temporarily flowing out immediately after the start of the re-bath.
[0019]
Note that the “safe temperature mixing opening” is the opening ratio at which the cold water and hot water are mixed at a temperature safe for the user (for example, 60 ° C. or less). The passage may be half open, the cold water passage may be half open, and the hot water passage may have a small opening.
[0020]
[5]
In any one of items 1 to 4,
“A failure notification requesting unit for requesting notification of an abnormal state to a remote control unit for remotely controlling a water heater connected to the hot water supply connection port,
In the case where the cold water passage is fixed at the first set opening degree, the abnormality notification requesting section includes control means for requesting the remote controller to notify the remote controller of an abnormal state. When the chilled water passage is fixed at the first set opening degree when the flow rate is equal to or less than 2 determination reference flow rate, this is regarded as an abnormality of the hot water passage, and the abnormality notification requesting unit requests the remote control unit to notify the abnormal state. To notify the remote controller of the abnormality.
[0021]
【The invention's effect】
Since the present invention has the above configuration, the present invention has the following specific effects.
When the upstream hot water passage is stopped, if the flow rate of the mixed water passage is equal to or less than the reference flow rate, the cold water passage is fixed at the first set opening, thereby hunting the flow rate of hot water flowing out of the water heater. Therefore, cold water having a stable flow rate is supplied from the cold water passage to the water heater via the hot water mixer. Accordingly, there is no inconvenience that the user is uncomfortable because a stable amount of hot water is supplied from the water heater.
[0022]
In the item of item 2, in addition to the above effect, when the temperature control operation is normally executed, the flow rate of the mixed water passage is less than or equal to the second determination reference flow rate by the user reducing the usage amount of the mixed water. Even if it becomes, it can be judged that this is the water flow stop state of the upstream hot water passage, and the cold water passage can be prevented from being fixed at the first set opening degree.
[0023]
In the item of item 3, in addition to the above effect, after the cold water passage is fixed to the first set opening and the hot water passage to the second set opening by the hot water / water mixer, hot water is transferred from the upstream hot water passage to the mixed water passage. If the detected temperature of the mixed water temperature sensor exceeds the return judgment reference temperature by supplying the water, the mixed water of the set temperature is obtained by adjusting the mixing ratio of the hot water from the hot water passage and the cold water from the cold water passage. Since the temperature control operation is automatically resumed, it is convenient and economical.
[0024]
In the item of item 4, when the hot water is stopped at the first set opening degree by the hot water / water mixer and the hot water is stopped and water flow through the mixed water passage is stopped, the cold water passage and the hot water passage are at a safe temperature. Since the mixing opening is set, there is no danger that hot mixed water will temporarily flow out of the hot water mixer when the cause of the water stop has already been eliminated when the hot water is started again. Moreover, since the normal temperature control operation is automatically resumed, convenience is good.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Next, the above-described embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram of a hot water supply system using a hot water mixing unit 1 for a hot water heater according to an embodiment of the present invention. A solar water heater 5 is connected to a hot water heater 7 via the hot water mixing unit 1 for a hot water heater. ing. Details of each part will be described below.
[0026]
[About solar water heater 5]
The solar water heater 5 includes a heat storage pipe 52 formed so as to circulate between the heat collector 50 that absorbs solar heat and the hot water storage tank 51. The heat storage pipe 52 includes an expansion tank 53 and a circulation pump 54. Is arranged.
Further, a drainage passage 58 having a water supply pipe 55 for supplying cold water from a water pipe and a drain plug 57 is connected to the bottom of the hot water storage tank 51, and an upstream hot water passage from the top of the hot water storage tank 51. 56 is pulled out.
[0027]
[About water heater 7]
The water heater 7 includes a water heater body 70 in which a heat exchanger heated by a gas burner (not shown) and a remote controller 71 electrically connected to the water heater body 70 are provided. A switch 72, a hot water filling switch 73 and a hot water supply temperature setting device 75 that are operated when hot water is filled in the bathtub 81, and a notification unit 74 for notifying the operation state of the hot water heater are provided.
The hot water supply body 70 and the bathtub 81 are connected by a forward pipe 82 and a return pipe 83 used for hot water filling and heating, and are further connected to a hot water supply passage 84 drawn from the hot water supply body 70. A hot water tap 85 is provided.
[0028]
[About the hot water mixing unit 1 for water heater]
The hot water mixing unit 1 for hot water heaters that is the subject of the present invention branches off from the hot water pipe connection port 16 to which the upstream hot water passage 56 through which hot water from the solar water heater 5 flows and the solar water supply pipe 55 described above. A water supply pipe connection port 17 to which the water supply passage 10 is connected, and a water heater connection port 18 connected to the water inlet 77 of the water heater main body 70 are further provided.
[0029]
In the hot water passage 14 formed on the downstream side of the hot water pipe connection port 16, a vacuum breaker 120, a normally closed electromagnetic valve 31, a check valve 13, and a hot water temperature sensor 19 are arranged upstream in this order. It is arranged from. Further, near the upstream end of the hot water passage 14, a water drain plug 21 having a function of removing dust in the water flow and a function of draining the passage is provided.
[0030]
On the other hand, a check valve 22, a feed water temperature sensor 23, and a hot water / water mixer 20 are arranged in this order in the cold water passage 15, and the hot water / water mixer 20 joins the hot water passage 14 and the cold water passage 15. A hot water regulating valve 25 disposed at a point and a cold water regulating valve 24 disposed in the cold water passage 15 on the upstream side thereof are configured. The cold water adjusting valve 24 and the hot water adjusting valve 25 cause the valve bodies 241 and 251 at the front end to contact and separate from the valve ports 26 and 27 by the rotation of the corresponding pulse motors 240 and 250, thereby the valve port 26. , 27 is configured to adjust the flow rate by changing the opening degree. Further, the mixed water passage 29 is provided with a flow rate sensor 32 for measuring the flow rate of the mixed water, a mixed water temperature sensor 33, an abnormality monitoring sensor 34, and a drain plug 35. It also functions as a relief valve that opens when the water pressure in the passage 29 or the like is excessively increased to release the pressure. Further, near the upstream end of the cold water passage 15, a water drain plug 30 having both a function of removing dust in the water flow and a function of draining the passage is provided.
[0031]
The electrical components such as the hot water temperature sensor 19, the feed water temperature sensor 23, the hot water / water mixer 20, the normally closed solenoid valve 31, the flow rate sensor 32, the mixed water temperature sensor 33 and the abnormality monitoring sensor 34 are electrically connected to the control device 11. The operation of the hot and cold water mixer 20 is controlled by the control device 11.
[0032]
[Actual hot water supply operation]
Next, the operation of the hot water supply system will be described.
The control device 11 incorporated in the hot water mixing unit 1 for hot water heaters stores a microcomputer that executes the control operation having the contents shown in the flowchart of FIG. 2. Hereinafter, the operation of the hot water supply system according to the present embodiment will be described. This will be described with reference to the flowchart of FIG.
[0033]
First, a signal indicating whether or not an operation switch 72 provided on the remote controller 71 of the water heater 7 is operated is transmitted from the water heater body 70 to the control device 11 of the hot water mixing unit 1 for the water heater via the communication cable 79. Is monitored (ST1).
When it is confirmed that the operation switch 72 has been operated, the normally closed solenoid valve 31 is opened, and the hot water mixer 20 is moved to a safe temperature mixing opening (in this embodiment, the cold water adjustment valve 24 is set to the maximum). The opening degree and the hot water adjustment valve 25 are set to a minute opening degree). As a result, the warm water from the upstream warm water passage 56 slightly flows into the mixed water passage 29 (ST2).
[0034]
Next, it is determined whether or not the flow rate Q of the mixed water detected by the flow rate sensor 32 exceeds the base flow rate (2 liters / minute in the present embodiment) (ST3). If the mixed water of the flow rate Q exceeding the basal flow rate flows through the opening operation of the tap tap 85 or the hot water filling switch 73 is turned on, and the basal output from the flow rate sensor 32 is confirmed, the mixed water flowing out from the hot water mixer 20 When the detected temperature of the mixed water temperature sensor 33 for detecting the temperature of the water is compared with the set hot water supply temperature as the set temperature described above set by the remote controller 71 (ST4), the temperature of the mixed water is higher than the set hot water temperature Performs a temperature adjustment operation that increases the amount of cold water supplied from the water supply passage 10 and further decreases the amount of hot water supplied from the upstream hot water passage 56 (ST5 to ST9).
[0035]
The opening degree of the chilled water adjustment valve 24 and the hot water adjustment valve 25 can be determined by the number of pulses of the pulse motors 240 and 250. If the chilled water adjustment valve 24 is not at the maximum opening degree in ST6, the chilled water adjustment is performed. When the opening degree of the valve 24 is increased by one level (for example, one tenth of the maximum opening degree) and the warm water adjustment valve 25 is not at the minimum opening degree in ST8, the opening degree of the hot water adjustment valve 25 is set to 1. The temperature of the mixed water is adjusted to the set hot water supply temperature by decreasing each level.
[0036]
On the other hand, when the temperature of the mixed water is lower than the set hot water supply temperature in ST4, control is performed to increase the amount of hot water supplied from the upstream hot water passage 56 and further reduce the amount of cold water supplied from the water supply passage 10. To do. That is, when it is confirmed that the hot water adjustment valve 25 is not at the maximum opening, the opening of the hot water adjustment valve 25 is increased by one level in order to increase the amount of hot water supplied from the upstream hot water passage 56 (ST10). , ST11). When the temperature of the hot water adjustment valve 25 is at the maximum opening but the temperature of the mixed water is lower than the set hot water supply temperature, the opening of the cold water adjustment valve 24 is further reduced in order to reduce the amount of cold water supplied from the water supply passage 10. Is decreased by one level (ST12, ST13).
[0037]
At this time, after the opening degree of the cold water regulating valve 24 is decreased by one level in ST13, the flow rate Q of the mixed water detected by the flow rate sensor 32 is equal to or less than the determination reference flow rate A (4 liters / minute in the present embodiment). It is monitored whether it has become (ST14). That is, when the hot water regulating valve 25 has the maximum opening and the opening of the cold water regulating valve is decreased, if the mixed water flow rate Q becomes smaller than the determination reference flow rate A, the upstream hot water passage 56 Since there is a possibility of freezing or a solar cock 59 disposed in the upstream hot water passage 56 may be closed, the cold water regulating valve 24 is set to the first set opening (for example, the maximum opening or The warm water regulating valve 25 is fixed at the second set opening (for example, half-open or minute opening) (ST15).
[0038]
Further, in this state, whether or not the detected temperature of the mixed water temperature sensor 33 has become equal to or higher than the return determination reference temperature, or whether or not the hot water is stopped and the mixed water flow rate Q detected by the flow rate sensor 32 becomes zero. Is monitored.
[0039]
That is, the cause of the water flow stoppage of the upstream hot water passage 56 such as freezing is eliminated, and the hot water is supplied from the upstream hot water passage 56 to the mixed water passage 29, so that the detected temperature of the mixed water temperature sensor 33 is returned to the determination reference temperature. (For example, a temperature obtained by adding a constant α to the detected temperature of the feed water temperature sensor 23, or the set hot water temperature described above) or the like, the chilled water regulating valve 24 and the water temperature are adjusted to adjust the temperature of the mixed water to the set hot water temperature. Normal temperature control for adjusting the opening degree of the hot water adjustment valve 25 is executed again (ST16).
[0040]
Further, when the hot water tap faucet 85 is closed or the hot water filling switch 73 is released, the hot water is stopped, and when the flow rate Q of the mixed water detected by the flow rate sensor 32 becomes 0 (water flow stopped state), the cold water regulating valve 24 Is set to the maximum opening, and the warm water adjustment valve 25 is set to a minute opening (for example, 1/10 of the maximum opening) (ST17, ST2). When the flow rate Q of the mixed water exceeds the basal flow rate by opening the tap hot water tap 85 or the like, the normal temperature control is executed again.
[0041]
That is, until the detected temperature of the mixed water temperature sensor 33 becomes equal to or higher than the return determination reference temperature or the hot water is stopped, the cold water from the water supply passage 10 passes through the hot water mixer 20 and is supplied to the hot water heater 7 as it is. Then, the cold water is heated to the set hot water supply temperature by the hot water heater 7 and then supplied to the hot water tap 85 and the like.
[0042]
Thereby, since the opening degree of the cold water adjustment valve 24 and the hot water adjustment valve 25 is not changed while detecting whether or not the upstream side hot water passage 56 is in a water flow stop state, a stable amount of water is supplied to the water heater 7. And the hunting which the quantity of the warm water which flows out out of the hot water heater 7 repeats increase / decreases like the above-mentioned conventional can be prevented reliably.
[0043]
In the present embodiment, the hot water / water mixer 20 is controlled so that the set hot water temperature set by the hot water temperature setting device 75 provided in the remote controller 71 of the hot water heater 7 is equal to the detected temperature of the mixed water temperature sensor 33. However, in the case of the hot water supply 7 with a fixed hot water temperature without the remote controller 71, the set hot water set by a temperature setting device such as a dip switch provided in the hot water heater body 70 or the hot water mixing unit 1 for the hot water heater. The hot and cold water mixer 20 is controlled so that the temperature and the detected temperature of the mixed water temperature sensor 33 are equal. Moreover, as the hot water supply device, in addition to the above-described solar water heater 5 using natural energy, a hot water supply device using various waste heats can be applied.
[Brief description of the drawings]
FIG. 1 is a schematic view of a hot water supply system including a hot water mixing unit for a hot water heater according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of the hot water mixing unit for a hot water heater according to an embodiment of the present invention. 3) Illustration of the conventional example [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hot water mixing unit 5 for water heaters ... Solar water heater 7 ... Water heater 10 ... Water supply passage 14 ... Hot water passage 15 ... Cold water passage 16 ... Hot water piping connection port 18 ..Water supply pipe connection port 19 ... Hot water temperature sensor 20 ... Hot water mixer 23 ... Water supply temperature sensor 29 ... Mixed water passage 33 ... Mixed water temperature sensor

Claims (5)

A cold water passage serving as a water supply pipe connection port connected to a water supply passage through which cold water flows at the upstream end;
A hot water passage serving as a hot water pipe connection port connected to an upstream hot water passage through which an upstream end flows hot water from a hot water supply device;
A mixed water passage that is connected to a downstream water heater connection port from a junction where the cold water passage and the hot water passage merge, and is provided with a mixed water temperature sensor;
The mixing ratio of the cold water and the hot water at the junction is adjusted by adjusting the opening of the cold water passage and the opening of the hot water passage so that the detected temperature of the mixed water temperature sensor becomes a set temperature. In a hot water / water mixing unit for a water heater, comprising a hot water / water mixer for performing a temperature control operation,
When the hot water / water mixer performs the temperature adjustment operation to set the opening degree of the hot water passage to the maximum and the opening degree of the cold water passage to the minimum, the flow rate of the mixing water passage is a first determination reference flow rate. In the case of the following, a hot water / water mixing unit for a water heater, comprising control means for fixing the cold water passage to a first set opening degree by the hot water / water mixer. A cold water passage serving as a water supply pipe connection port connected to a water supply passage through which cold water flows at the upstream end;
A hot water passage serving as a hot water pipe connection port connected to an upstream hot water passage through which an upstream end flows hot water from a hot water supply device;
A mixed water passage that is connected to a downstream water heater connection port from a junction where the cold water passage and the hot water passage merge, and is provided with a mixed water temperature sensor;
The mixing ratio of the cold water and the hot water at the junction is adjusted by adjusting the opening of the cold water passage and the opening of the hot water passage so that the detected temperature of the mixed water temperature sensor becomes a set temperature. In a hot water / water mixing unit for a water heater, comprising a hot water / water mixer for performing a temperature control operation,
As a result of setting the opening degree of the hot water passage to the maximum and setting the opening degree of the cold water passage to the minimum by the hot water / water mixer performing the temperature control operation, the flow rate of the mixing water passage is determined as a second determination criterion. A hot water mixing unit for a hot water heater, comprising control means for fixing the cold water passage to a first set opening degree by the hot water / water mixer when the flow rate becomes lower than the flow rate. In the hot water mixing unit for hot water heaters according to claim 1 or 2,
When the cold water passage is fixed at the first set opening, the hot water passage is fixed at the second set opening by the hot water mixer, and then the detected temperature of the mixed water temperature sensor is equal to or higher than the return determination reference temperature. In this case, a hot water / water mixing unit for a water heater, comprising control means for adjusting the mixing ratio by the hot water / water mixer so that the detected temperature of the mixed water temperature sensor becomes the set temperature. In the hot water mixing unit for hot water heaters according to any one of claims 1 to 3,
When water flow through the mixed water passage is stopped after the cold water passage is fixed at the first set opening, the cold water passage and the hot water passage are set to a safe temperature mixing opening by the hot water mixer. A hot water mixing unit for water heaters equipped with a control means. In the hot water mixing unit for hot water heaters according to any one of claims 1 to 4,
Comprising an abnormality notification requesting unit for requesting notification of an abnormal state with respect to a remote control unit for remotely controlling a water heater connected to the water heater connection port;
When the cold water passage is fixed at the first set opening, a hot water mixing unit for a hot water heater, comprising control means for requesting the remote control unit to report an abnormal state by the abnormality notification request unit.

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