JP3750230B2 - Flow drop method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow drop method, and more particularly to a flow drop method that can reliably determine a drop abnormality when a flow is dropped.
[0002]
[Prior art]
Conventionally, as this type of technology, a temperature sensor has been installed near the drop passage to the bathtub, and when dropping hot water into the bathtub, the drop temperature is monitored by the temperature sensor, and if an abnormal temperature is detected, the drop is detected. There are things that are judged as abnormal and shift to safe operation.
[0003]
In addition, some bathtubs have a memorial function, which is provided with a circulation path that is a return pipe and a forward pipe in the bathtub so that the hot water in the bathtub circulating in the circulation path is heated by a heat exchanger. It is very convenient and often used. In such a case, connect the dropping path to this circulation path, and drop the hot water into the bathtub using both the return pipe mouth and the outgoing pipe mouth of the bathtub. There is something that can be done.
[0004]
[Problems to be solved by the invention]
Although there is such a conventional one, the following problems occur in the conventional one. First, if the temperature sensors are increased each time to detect the temperature related to the flow, a large number of temperature sensors are required, and accordingly, monitoring control and wiring of the sensors become complicated, and a reduction in the number of temperature sensors is desired. . For example, what is presented in the prior art requires a temperature sensor that monitors the drop temperature, a flow temperature sensor that monitors the temperature of the bathtub, and the like, and if it can be realized with one temperature sensor, it can be realized with a simple configuration.
[0005]
In addition, in the case where a temperature sensor for monitoring the temperature dropped into the bathtub is provided in the circulation path near the bathtub, when the amount of water injection decreases, for example, hot water flows in one pipe and flows too much in the direction where the temperature sensor is arranged. When it disappears, it has a problem that it cannot detect the correct temperature by picking up the ambient temperature of the place instead of the drop temperature.
[0006]
Therefore, the present invention has been made in view of the above-described problems, and provides a flow dropping method for properly determining an abnormality in dropping into a bathtub while reducing the number of temperature sensors in such an apparatus. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is a flow circuit comprising a bathtub, a flow return path for taking out hot water from the bathtub and sending it to the heat exchanger, and a flow return path sending it to the bathtub through the heat exchanger. A circulation pump provided in the circulation path for circulating hot water in the bathtub in the circulation path, a flow temperature sensor provided in the flow return path for detecting the temperature of the bathtub, and a flow forward path for dropping hot water into the bathtub And a flow dropping control means for controlling the dropping operation to the bathtub, and an abnormality determining means for determining an abnormality during the dropping operation to the bathtub. When dropping hot water, the flow temperature sensor determines whether or not the temperature to be dropped is normal, and if the flow temperature sensor detects an abnormal temperature, the flow is temporarily dropped into the bathtub. Even when the circulation pump is turned on and the hot water in the bathtub is circulated in the circulation path, if an abnormal temperature is detected by the flow temperature sensor, it is determined as abnormal by the abnormality determination means, and is normal. When the temperature is detected, the abnormality determining unit determines that the temperature is normal, and when the abnormality determining unit determines that the temperature is normal, the dropping control unit continues the dropping operation.
[0008]
The invention according to claim 2 is a flow circuit comprising a bathtub, a flow return path for taking out the hot water of the bathtub and sending it to the heat exchanger, and a flow forward path for sending it to the bathtub through the heat exchanger, and the hot water of the bathtub in the circulation path. A circulation pump provided in the circulation path for circulation, a water flow switch for detecting circulation of hot water in the bathtub in the flow circulation path, a flow temperature sensor provided in the flow return path for detecting the temperature of the bathtub, A flow drop path connected to the flow forward to drop hot water into the bathtub, a flow drop control means for controlling the drop operation to the bathtub, and an abnormality determination means for determining an abnormality during the drop operation to the bathtub are provided. When the drop control means drops hot water into the bathtub, the flow temperature sensor determines whether the drop temperature is normal, and the flow temperature sensor detects an abnormal temperature. If it is detected continuously for a predetermined time (or a predetermined flow rate), the dropping into the bathtub is temporarily stopped, the circulation pump is turned on, and the temperature is detected again by the flow temperature sensor after the water flow switch is turned on. When an abnormal temperature is detected for a predetermined time (or a predetermined flow rate), the abnormality determination unit determines that the temperature is abnormal. When a normal temperature is detected, the abnormality determination unit determines that the temperature is normal. When it is determined as normal, the dropping operation is continued by the dropping control means.
[0009]
According to the first aspect of the present invention, when the flow temperature sensor detects a temperature outside the normal range during the dropping operation of the hot water into the bathtub by the dropping control means, the circulation is temporarily performed without immediately determining that it is abnormal. The pump is driven to circulate hot water in the bathtub through the flow temperature sensor, and after confirming again whether the temperature is abnormal, the abnormality determining means determines that it is abnormal.
[0010]
According to the second aspect of the present invention, since the flow temperature sensor determines that the temperature is outside the normal range for a predetermined time (or predetermined flow rate), it is determined that the temperature is abnormal. Is not judged abnormal. Furthermore, when the circulation pump is once driven and re-detected by the flow temperature sensor, the detection is confirmed after the water flow switch is turned on, so that the temperature of the hot water in the bathtub can be reliably detected.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments.
FIG. 1 is an overall configuration diagram of a one-can two-circuit type hot water supply device showing an embodiment of a hot water supply device with a bath automatic hot water supply function to which the present invention is applied, FIG. 2 is a control configuration diagram, and FIG. 3 is its control operation. It is a flowchart which shows.
[0012]
The whole structure of the 1 can 2 circuit type hot water supply apparatus is demonstrated along FIG. Reference numeral 10 denotes a single can / two-circuit type heat exchange can body, which includes one blower fan 11 and one burner 12. The burner 12 includes a fuel spray nozzle 12a, an igniter 12b, and the like. Fuel is supplied to the spray nozzle 12a by a supply pump 12c via a supply control valve 12d.
In the upper space in the heat exchange can 10, a heat exchange part 20 a of the bath recirculation circuit 20 and a heat exchange part 40 a of the hot water supply circuit 40 are arranged.
The bath recirculation circuit 20 carries a flow return path 21 for conveying bathtub water from a bathtub (not shown) to the heat exchange can 10 and heat-heated hot water from the heat exchange can 10 to the bathtub. And a flow forward path 22 for the purpose.
The flow return path 21 is provided with a circulation pump 32, a water flow switch 33, and a flow temperature sensor 34.
[0013]
The hot water supply circuit 40 has a water intake pipe 41 for conveying water from the water supply to the heat exchange can body 10 and a hot water discharge pipe 42 for discharging hot water heated by the heat exchange can body 10. The pipe 43 and the flow dropping path 44 are branched and extended.
The water inlet pipe 41 is provided with a water amount sensor 51 and a water inlet temperature sensor 52, and the hot water outlet pipe 42 is provided with a hot water temperature sensor 53. A bypass 46 is provided from the water intake pipe 41 via a proportional control valve 45 so that water can be mixed. A water amount adjustment valve 54 and a hot water supply temperature sensor 55 are provided downstream of the junction of the bypass 46.
A general hot water supply curan 43a is provided at the end of the general hot water supply pipe 43, and the flow drop channel 44 is connected to the flow forward channel 22 of the bath recirculation circuit 20 via a drop valve unit 44a having a flow rate sensor 44b. In addition, automatic bath water supply operation is possible.
[0014]
Further, a flow bypass path 60 is provided between the flow forward path 22 and the flow return path 21, and the connection location between the flow bypass path 60 and the flow return path 21 is closer to the heat exchange unit 20 a than the flow temperature sensor 34. It has become. A check valve 61 is provided in the flow bypass path 60. Therefore, at the time of reflowing the flow, the circulation pump 32 is driven and circulates in the circulation path 20 from the flow return path 21 side to the flow forward path 22 side, and is reheated and heated by the heat exchanging part 20a. Is detected. At this time, the check valve 61 of the flow bypass path 60 is in the reverse direction, and does not flow from the flow return path 21 to the flow forward path 22 side through the flow bypass path 60.
[0015]
When hot water is dropped into the bathtub from the hot water supply side through the flow dropping path 44, water is poured from the flow dropping path 44 through the flow going path 22 into the bathtub. At this time, the check valve 61 is in the forward direction, so the flow going path 22. Further, water is poured into the bathtub through the flow bypass path 60 and the flow return path 21. At this time, the flow temperature sensor 34 detects the temperature dropped into the bathtub.
[0016]
By doing in this way, the detection of the temperature of a bathtub and the drop temperature dropped in a bathtub with one flow temperature sensor 34 can be combined. Furthermore, since the flow direction is forwarded when the flow is dropped by the flow bypass path 60 and the check valve 61, water can be poured from the connection ports of the bathtubs on both the flow forward path 22 and the flow return path 21 so that the flow can be quickly dropped. Can be realized.
[0017]
Reference numeral 70 denotes a control unit that receives information from sensors provided in each unit and issues a command to each unit of the apparatus. The control unit 70 will be described in detail with reference to FIG. 2. The control unit 70 includes a temperature monitoring means 71, a drop control means 72, an abnormality determination means 73, an abnormality processing means 74, a timer means 75, and other control means 76. is doing. In response to signals from various temperature sensors such as the flow temperature sensor 34 and sensors such as the water flow switch 33, commands are issued to various drive units such as the circulation pump 32. In addition, a remote controller 80 is connected to the control unit 70, and commands are issued to each part of the apparatus in response to an operation instruction from the remote controller 80.
[0018]
First, the temperature monitoring means 71 which comprises the control part 70 monitors various temperature sensors, and utilizes them for hot water supply temperature control, or for abnormality determination. For example, the temperature of the bathtub is detected by monitoring the flow temperature sensor 34 at the time of reheating, and the temperature is raised to a desired temperature. When hot water is poured into the bathtub, the temperature dropped into the bathtub is monitored by the flow temperature sensor 34. It is used to determine if there is an abnormal drop into the bathtub. The drop control means 72 is means for controlling the drop operation from the hot water supply side to the bathtub through the flow drop path 44. For example, when the automatic switch 82 of the remote controller 80 is operated or the like, an operation such as opening the dropping valve unit 44a is performed when water injection to the bathtub is instructed, and hot water is dropped into the bathtub from the hot water supply side.
[0019]
The abnormality determination means 73 is a means for determining whether the above-described operation is normal or normal. For example, when water is poured into the bathtub, the temperature at which the flow temperature sensor 34 is dropped into the bathtub is monitored. If the temperature is too high or too low, it can be determined that there is a high possibility of an abnormal flow drop. The abnormality determination by the abnormality determination unit 73 will be described later in detail. The abnormality processing unit 74 is a unit that performs a safe operation or displays the content of the abnormality on the remote controller 80 when the abnormality determination unit 73 determines that an abnormality has occurred. The timer means 75 is a means for measuring time, for example, counting a predetermined time for monitoring the sensor. The other control means 76 is means for controlling various operations other than those described above, and performs transmission control with the remote controller 80, for example.
[0020]
The remote controller 80 is for remotely operating the hot water supply apparatus with bath automatic hot water supply function. The remote controller 80 has an operation unit such as a power switch 81 and an automatic switch 82 for performing the dropping operation into the bathtub in full operation, and the operation contents thereof. And a display unit 83 for displaying the state of the hot water supply apparatus.
[0021]
Next, the operation of the present invention will be described with reference to the flowchart of FIG. As shown in FIG. 3, when the automatic switch 82 of the remote controller 80 is operated, water is poured into the bathtub in a fully automatic manner, and an operation for performing a filling operation to a predetermined water level is started (step S1). First, a predetermined set flow rate is poured so that the water level reaches the water level at the circulation port of the bathtub of the circulation path 20 (step S2). After that, pouring is performed to the set water level. At that time, hot water supplied from the hot water supply side is poured from the flow dropping path 44 into the bathtub through the flow forward path 22, and the bypass path 60 and the flow return path. Since the hot water is poured into the bathtub through 21, the drop temperature is monitored by the flow temperature sensor 34 (step S3).
[0022]
In step S3, the detected temperature of the flow temperature sensor 34 is compared with the flow set temperature + A degree on the remote controller 80 side, and if the detected temperature of the flow temperature sensor 34 is lower, it is determined that it is normal rather than high temperature abnormal pouring. Then, pouring is performed up to the set water level, and pouring is terminated when the set water level is reached (step S4). Then, the warming operation is performed for 4 hours after the automatic switch 82 is operated. When the temperature of the bathtub is lowered, the circulation pump 32 is driven, and the reheating is performed by the circulation path 20 and the heat exchanger 20a to perform the warming operation. (Step S5). When 4 hours have elapsed, the full-auto operation mode is canceled and the process ends (step S6).
[0023]
In step S3, when the flow temperature sensor 34 detects a temperature of the flow set temperature + A degrees, it is determined whether or not the state continues for B liters (step S7). The flow rate is measured by a flow rate sensor 44 b provided in the flow dropping path 44. If not continued, the routine returns to the routine of steps S3 and S4 as a fluctuation due to a temporary disturbance. If the detected temperature deviates from the normal range continuously in step S7, the process proceeds to step S8.
[0024]
The reason why the drop into the bathtub was not immediately abnormal is that the flow temperature detection sensor 34 may not be able to accurately detect the pouring temperature in the case of the configuration shown in FIG. That is, when hot water is dropped into the bathtub from the hot water supply side through the dropping path 44, the bathtub is routed from the dropping path 44 to the bathtub through the flow forward path 22 and to the bathtub through the flow bypass path 60 and the flow return path 21. However, if the other plug 43a is used at that time, the amount of water passing through the dropping channel 44 decreases, so the amount of water on the flow bypass channel 60 and the flow return channel 21 side is particularly affected. Decrease in response. This is because the water flow resistance is large because the check valve 61 and the like are provided as compared with the flow forward path 22. For this reason, the flow temperature sensor 34 picks up the ambient temperature in the flow return path 21 instead of the temperature of hot water to be dropped, and may not be able to detect the correct pouring temperature. Therefore, if it is determined in step S7 that the B liter abnormal temperature is detected as a drop-in abnormality, it will be determined as abnormal based on the erroneous detection, which is not appropriate. For this reason, the operations in steps S8 to S13 are necessary, and it is necessary to confirm whether or not there is an abnormal drop. Although one other plug 43a is shown in FIG. 1, in practice, a plurality of such plugs are generally provided in a kitchen, a washroom, etc., and therefore the necessity for such an operation is high.
[0025]
In step S7, when B liters are continuously detected and a temperature outside the normal range is detected, the dropping valve unit 44a is closed, the pouring operation is temporarily interrupted, and the pouring amount up to the present is stored (step S8, S9). Then, the circulation pump 32 is turned on to circulate hot water in the bathtub in the circulation path 20 (step S10), and after the flow water flow switch 33 is turned on, the flow temperature sensor 34 detects the temperature (step S11). The reason why the water flow switch 33 is turned on is to ensure that the flow temperature sensor 34 detects the hot water in the bathtub.
[0026]
If the flow temperature sensor 34 detects an appropriate temperature, for example, due to the cause of the decrease in the amount of dropped water, it is determined that the dropping operation itself is normal (step S12), and the remaining amount of hot water poured into the bathtub is determined. The calculation is made, the remaining amount pouring is resumed, and the process returns to step S3 (steps S15 and S16).
[0027]
Even after the water flow switch 33 is turned on in step S11, if the flow temperature detection sensor 34 continuously detects a temperature outside the normal temperature range for C seconds which is a predetermined period (steps S12 and S13), the temperature is also detected. When it is determined that there is an abnormality, the abnormality processing means 74 performs a safe operation and ends (steps S14 and S17).
[0028]
In the above-described embodiment, the condition is that the flow rate of B liters is continued in step S7, but the condition may be that it continues for a predetermined time.
Moreover, in the said embodiment, although it is conditional on continuing for predetermined time by step S13, you may make it make it a condition to provide a water quantity sensor and to continue predetermined flow volume.
Moreover, in the said embodiment, although the temperature re-check operation | movement (step S12, S13) by the flow temperature sensor 34 is performed on condition that the water flow switch 33 was turned on by step S11, step S11 is abbreviate | omitted. Can be done. Alternatively, step S11 may be omitted and the process may proceed to steps S12 and S13 on the condition that a predetermined time has elapsed.
[0029]
Moreover, in the said embodiment, although it is made to drop at once to the circulation port of the circulation circuit of a bathtub in step S2, when the water level is unknown, such as at the time of the first pouring, the hot water is poured into the bathtub at a predetermined flow rate. If the circulation pump 32 is turned on each time to determine whether or not the water flow switch 33 is turned on, the flow rate turned on is memorized, and the next time and thereafter the amount is poured at a time in step S2. It is convenient because it allows you to quickly drop the bathtub.
[0030]
Further, in the above embodiment, only the case where the detected temperature of the flow temperature sensor 34 is too high in steps S3 and S12 is described, but if it is too low, it may be determined as abnormal.
[0031]
【The invention's effect】
As described above, in the present invention, when the flow temperature sensor detects a drop temperature abnormality during the dropping operation of hot water into the bathtub, the circulation pump is temporarily driven without immediately determining that the drop is abnormal. The hot water in the bathtub is circulated through the temperature sensor, and it is confirmed whether or not the temperature is abnormal again, and then it is determined whether or not it is abnormal. Even if it is normal by detection, there is an effect that it is not discriminated as abnormal.
[0032]
In the present invention, since the flow temperature sensor determines that the temperature is out of the positive range for a predetermined time (or predetermined flow rate), it is determined that the temperature is out of the normal range. Absent. Further, when the circulating pump is once driven and re-detected by the flow temperature sensor, the detection is confirmed after the water flow switch is turned on, so that the temperature of the hot water in the bathtub can be reliably detected.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an apparatus to which the present invention is applied.
FIG. 2 is a block diagram showing a control configuration of the present invention.
FIG. 3 is a flowchart showing the operation of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 Circulation path 20a Heat exchanger 21 Flow return path 22 Flow forward path 32 Circulation pump 33 Water flow switch 34 Flow temperature sensor 44 Flow drop path 60 Flow bypass path 61 Check valve

Claims (2)

Provided in the circulation path to circulate the hot water of the bathtub in the circulation path and the flow circulation path consisting of the bathtub, the flow return path to take out the hot water in the bathtub and send it to the heat exchanger and the flow forward path to send to the bathtub through the heat exchanger A circulating pump, a flow temperature sensor provided in the flow return path for detecting the temperature of the bathtub, a flow drop path connected to the flow forward path for dropping hot water into the bathtub, and a drop operation to the bathtub are controlled. Provided with a flow drop control means and an abnormality determination means for determining an abnormality during a drop operation to the bathtub,
When dropping the hot water into the bathtub by the drop control means, determine whether or not the drop temperature is normal by the flow temperature sensor,
If the flow temperature sensor detects an abnormal temperature, temporarily stop dropping into the bathtub, turn on the circulation pump,
Even after the hot water in the bathtub is circulated through the circulation path, when an abnormal temperature is detected by the flow temperature sensor, it is determined as abnormal by the abnormality determining means, and when a normal temperature is detected, it is determined as normal by the abnormality determining means. Discriminate,
If it is determined normal by the abnormality determination means, continue the drop operation by the drop control means,
Flo drop method characterized by. Provided in the circulation path to circulate the hot water of the bathtub in the circulation path and the flow circulation path consisting of the bathtub, the flow return path to take out the hot water in the bathtub and send it to the heat exchanger and the flow forward path to send to the bathtub through the heat exchanger A circulating pump for detecting the circulation of hot water in the bathtub in the flow circulation path, a flow temperature sensor provided in the flow return path for detecting the temperature of the bathtub, and a flow flow sensor for dropping hot water into the bathtub. A flow drop path connected to the forward path, a flow drop control means for controlling the drop operation to the bathtub, and an abnormality determination means for determining an abnormality during the drop operation to the bathtub,
When dropping the hot water into the bathtub by the drop control means, determine whether or not the drop temperature is normal by the flow temperature sensor,
If the flow temperature sensor continuously detects an abnormal temperature for a predetermined time (or a predetermined flow rate), the dropping into the bathtub is temporarily interrupted, the circulation pump is turned on, and the flow switch is turned on again. When the temperature is detected by the temperature sensor and an abnormal temperature is detected for a predetermined time (or a predetermined flow rate), the abnormality is determined to be abnormal by the abnormality determination means. When the normal temperature is detected, the abnormality is determined to be normal. Discriminate,
If it is determined normal by the abnormality determination means, continue the drop operation by the drop control means,
Flo drop method characterized by.

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