JP3915775B2 - Hot water temperature controller - Google Patents

Description

The present invention relates to a hot water supply temperature control device capable of stably controlling a hot water supply temperature in a hot water supply device that supplies hot water to a bathtub, a kitchen, or the like.

  Conventionally, this type of hot water supply temperature control device can control each hot water supply temperature independently of each other by providing a mixing valve for general faucet hot water supply and a mixing valve for bathtub hot water supply, respectively. For example, see Patent Document 1).

  FIG. 1 is a system configuration diagram including piping of a hot water supply apparatus provided with the conventional hot water supply temperature control apparatus described in Patent Document 1.

  In FIG. 1, 1 is a hot water channel connected to a temperature source and supplying hot water, and 2 is a water channel connected to a water source and supplying water. 3 is a bathtub hot water supply path, and is connected to the bathtub 5 through the bathtub adapter 4. The bathtub hot water supply path 3 has a bathtub mixing valve 31 for making hot water to be supplied to the bathtub 5 at an appropriate temperature, a bathtub temperature sensor 32 for detecting the hot water supply temperature to the bathtub 5, and a bathtub flow rate for measuring the amount of hot water supplied to the bathtub 5. The sensor 33 and the on-off valve 34 for starting or stopping the hot water supply to the bathtub 5 are provided.

  A general faucet hot water supply path 6 is connected to the faucet 7. The general faucet hot water supply path 6 includes a faucet mixing valve 61 for bringing hot water supplied to the faucet 7 to an appropriate temperature, and a faucet temperature sensor 62 for detecting a hot water supply temperature to the faucet 7.

  Reference numeral 8 denotes a bathroom remote controller, and 9 a kitchen remote controller, which can perform operations such as setting the hot water supply temperature and starting or stopping hot water supply to the bathtub. A control unit 10 performs overall control.

  Next, the operation will be described. When the hot water supply operation from the general faucet, for example, the kitchen faucet 7 is opened, the control unit 10 is based on the input value of the faucet temperature sensor 62 so that the faucet mixing valve 61 becomes the set faucet hot water supply temperature. Feedback control is performed, and hot water and water supplied from the hot water channel 1 and the water channel 2 are mixed at an appropriate temperature and supplied to the faucet 7.

  As hot water supply operation to the bathtub 5, there are four patterns of hot water filling, high temperature hot water, additional hot water, and hot water. For example, when the hot water hot water switch of the bathroom remote control 8 is pressed, the control unit 10 opens the on-off valve 34 to start hot water supply to the bathtub 5 and simultaneously opens the bathtub mixing valve 31 to the hot water side. Control to supply hot water directly. After the hot water supply to the bathtub 5 is started, the integrated flow rate is counted by the flow sensor 33, and when it reaches a certain amount, the on-off valve 34 is closed to complete the hot water supply.

Next, the operation when simultaneous hot water supply is performed will be described. For example, it is assumed that hot water supply to the bathtub 5 is started while hot water is being supplied to the faucet 7 at a hot water supply temperature of 40 ° C. The faucet mixing valve 61 is adjusted so that the temperature detected by the faucet temperature sensor 62 is 40 ° C., and a predetermined amount of hot water is supplied from the hot water channel 1 and a predetermined amount of water is supplied from the water channel 2. Yes. At this time, when the hot water supply to the bathtub 5 is started, the control unit 10 opens the opening / closing valve 34 and opens the bathtub mixing valve 31 to the hot water side to supply the hot water from the hot water source directly.
JP 11-2111220 A

However, in the above-described conventional configuration, hot water supply to the bathtub hot water supply path 3 is performed while hot water supply is performed in the general faucet hot water supply path 6, the on-off valve 34 of the bathtub hot water supply path 3 is opened, and then the bathtub When the mixing valve 30 is opened to the full hot water side at a high speed, the hot water in the hot water flow channel 1 flowing in the bathtub hot water supply channel 3 increases rapidly. As a result, the amount of hot water supplied from the hot water flow path 1 to the general faucet hot water supply path 6 rapidly decreases, and as a result, a remarkable undershoot occurs in the hot water supply temperature of the general faucet hot water supply path 6, or the undershoot is reduced. It had the problem of continuing for a long time.

  It should be noted that overshoot or undershoot occurs for the same reason even when hot water filling, adding hot water, or pouring water is performed.

  This invention solves the said conventional subject, and it aims at providing the hot_water | molten_metal supply temperature control apparatus which can supply hot water at the stable temperature also at the time of the simultaneous hot water supply to a bathtub and a general faucet.

In order to solve the conventional problem, a hot water supply temperature control device according to the present invention includes a mixing valve that connects one of a plurality of flow paths branched from a hot water flow path and one of a plurality of flow paths branched from a water flow path. A plurality of temperature sensors that detect temperatures downstream of the plurality of mixing valves, and a control that controls the mixing valves disposed on the upstream side of the temperature sensors based on the output of the temperature sensors And when the plurality of mixing valves are controlled simultaneously, the control amount of the previously operated mixing valve is determined based on the control amount of the mixing valve operated later. .

  As a result, in addition to the feedback control by the temperature sensor provided in its own hot water discharge path, the influence of the hot water amount and the change in the water volume generated due to the change in the opening of the mixing valve provided in the other hot water discharge path is reflected in advance. Therefore, stable hot water supply temperature control can be performed even when simultaneous hot water supply to a plurality of hot water outlets is performed.

  The hot water supply temperature control device of the present invention can quickly stabilize the hot water supply temperature of each hot water supply passage even when hot water supply is simultaneously performed for a plurality of hot water supply passages, and is excellent in safety and easy to use. Can be realized.

The first invention is provided with a plurality of mixing valves that connect one of the flow paths branched from the hot water flow path and one of the flow paths branched from the water flow path to the downstream side of the plurality of mixing valves. A plurality of temperature sensors for detecting temperature; and a control means for controlling the mixing valve disposed on the upstream side of the temperature sensor based on an output of the temperature sensor; and simultaneously controlling the plurality of mixing valves In this case, the hot water supply temperature of each hot water supply passage is quickly stabilized by determining the control amount of the previously operated mixing valve based on the control amount of the mixing valve operated later . It is possible to realize a water heater that is excellent in use and easy to use. In addition, the hot water flow path and the disturbance of the water flow path generated when the hot water supply of the second hot water supply path is started or stopped while hot water is being supplied in the first hot water discharge path with respect to the first hot water discharge path. Since the influence is positively suppressed, quick temperature control can be performed when a disturbance occurs.

A second invention is, in particular, in the first invention, the control means operates when the operating speed of the mixing valve is operated is equal to or higher than a predetermined speed only, a control amount of the mixing valve which is operated after, ahead after By reflecting the control amount of the mixing valve, the influence of the disturbance is actively suppressed only when the disturbance of the hot water channel and the water channel is abrupt, and when the disturbance is slow, the feedback by the temperature sensor Since only the control is used, rapid temperature control can be reliably performed only when a disturbance occurs without impairing the temperature stability during normal operation.

A third invention is, in particular, in the first or second invention, the control means, after a predetermined time period from the start of operation of the mixing valve is operated only, the control amount of the mixing valve which is operated later, earlier By reflecting the control amount of the operated mixing valve, the influence of the disturbance is actively suppressed for a certain period after the disturbance of the hot water channel and the water channel occurs. After the lapse of time, only the feedback control by the temperature sensor is used, so that quick temperature control can be surely performed only when a disturbance occurs without impairing the temperature stability during normal times.

According to a fourth aspect of the present invention , in particular, in the first to third aspects of the present invention, the control means is configured such that a difference between a detection temperature of a temperature sensor that detects a tapping temperature of a mixing valve that is operated later and a control target temperature is a predetermined temperature By reflecting the control amount of the mixing valve operated later only on the control amount of the previously operated mixing valve only when the difference is larger than the difference, only when the disturbance of the hot water channel and the water channel is large, If the disturbance is small and the disturbance is small, it can be handled only by the feedback control using the temperature sensor. Therefore, quick temperature control is surely performed only when the disturbance occurs without impairing the normal temperature stability. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a system configuration diagram including piping of a hot water supply apparatus provided with a hot water supply temperature control apparatus according to the first embodiment of the present invention. Since the configuration is the same as that of a conventional example, the description thereof is omitted.

FIG. 2 is a configuration diagram of a proportional mixing valve used for the bathtub mixing valve 31 and the faucet mixing valve 61 of the present embodiment. The proportional mixing valve has an inlet 201 connected to the hot water channel 1 and an inlet 202 connected to the water channel 2, and the hot water flows through the opening 205 of the valve body by rotating the valve body 204 forward and backward. The inlet 201 of the channel 1 and the inlet 202 of the water channel 2 are continuously communicated with the outlet 203 (FIG. 2-A). That is, the valve body 204 fully opens the inlet 202 of the water flow path 2 and the inlet 2 of the hot water flow path 1.
01 is fully closed to achieve an opening degree θ = 0% (FIG. 2B) of the hot water channel 1 and the inlet 20 of the water channel 2
2 is fully closed and the inlet 201 of the hot water channel 1 is fully opened, and the opening θ of the hot water channel 1 is continuously changed in the forward and reverse directions until the opening θ = 100% (FIG. 2-D) is realized. Can be made.

  Next, the operation will be described. The hot water temperature from the faucet 7 is set in advance by the kitchen remote controller 9 or the bathroom remote controller 8. In addition, the faucet hot water temperature is provided with an upper limit value (for example, 60 ° C.) to the maximum set hot water temperature, and consideration is given to prevent instantaneous burns.

  When a hot water supply operation from a general faucet, for example, when opening the faucet 7 in the kitchen, the control unit 10 controls the faucet mixing valve 61 based on the input value of the faucet temperature sensor 62 so that the set faucet hot water temperature is reached. The hot water and water supplied from the hot water channel 1 and the water channel 2 are mixed at an appropriate temperature and supplied to the faucet 7.

  Here, the temperature control operation of the faucet mixing valve 61 will be described in detail. For example, when the faucet hot water supply temperature is set to 40 ° C. with the kitchen remote controller 9, when the detected temperature T1 <40 ° C. of the faucet temperature sensor 62, the faucet mixing valve 61 is set in the direction in which the opening degree θ1 increases. When the detected temperature T1> 40 ° C., the area ratio of the opening 205 to the hot water channel 1 and the water channel 2 is changed to 40 ° C. by driving the valve body 204 in the direction in which the opening θ1 decreases. Hot water supply at. At this time, when the deviation ΔT1 between the detected temperature T1 and the set temperature 40 ° C. is large, the driving speed v1 of the valve body 204 is increased, and when the deviation ΔT1 is small, the driving speed v1 is decreased. Temperature control can be performed while achieving both stability. If the deviation ΔT1 is in the range of 40 ± 1 ° C., the valve body 204 is not driven, thereby preventing the hunting operation of the faucet mixing valve 61 (Table 1).

浴槽５への給湯湯温は、予め浴室リモコン８で設定される。浴槽５への給湯動作としては、湯張り、高温差し湯、足し湯、差し水の４つのパターンがある。

The hot water temperature for the bathtub 5 is set in advance by the bathroom remote controller 8. As hot water supply operation to the bathtub 5, there are four patterns of hot water filling, high temperature hot water, additional hot water, and hot water.

  In order to perform the hot water filling operation, first, the hot water filling switch is pushed by the bathroom remote controller 8. As a result, a hot water filling command is output, the control unit 10 opens the on-off valve 34 to start hot water supply to the bathtub 5, and then the bath temperature at which the temperature detected by the bath temperature sensor 32 is set by the bathroom remote controller 8. Thus, feedback control is performed on the bathtub hot water supply mixing valve 31. After the hot water filling to the bathtub 5 is started, the accumulated flow is counted by the flow rate sensor 33 and the hot water filling is continued until the bath hot water amount set in advance by the bathroom remote controller 8 is reached. When the integrated flow rate reaches the set amount of bathtub hot water, the on-off valve 34 is closed to complete the hot water filling.

  In order to perform hot hot water supply when the temperature of the hot water in the bathtub 5 is lowered, first, the hot remote control switch is pressed by the bathroom remote controller 8. As a result, a high-temperature hot water command is output, and the control unit 10 opens the on-off valve 34 and starts hot water supply to the bathtub 5. Thereafter, feedback control is performed on the bathtub hot water mixing valve 31 so that the temperature detected by the bathtub temperature sensor 32 is high (for example, 80 ° C.), or feedback control is not performed, and the bathtub mixing valve 31 is fully filled with hot water. Open the hot water source directly. After the hot water supply to the bathtub 5 is started, the flow rate sensor 33 counts the integrated flow rate, and when it reaches a certain amount (for example, 20 L), the on-off valve 34 is closed to complete the hot water supply.

  In addition, in order to add hot water when the amount of hot water in the bathtub 5 decreases, first, the hot water switch is pushed with the bathroom remote controller 8. As a result, a command for adding hot water is output, and the control unit 10 opens the opening / closing valve 34 to start hot water supply to the bathtub 5, and then the bath temperature at which the temperature detected by the bath temperature sensor 32 is set by the bathroom remote controller 8. Thus, feedback control is performed on the bathtub hot water supply mixing valve 31. After the start of adding hot water to the bathtub 5, the integrated flow rate is counted by the flow rate sensor 33. When a certain amount (for example, 20L) is reached, the on-off valve 34 is closed to complete the hot water.

  In order to pour water, first, a water pour switch is pushed with the bathroom remote control 8. As a result, a slimming command is output, and the control unit 10 opens the on-off valve 34 and then opens the bathtub mixing valve 31 to the full water side to control to directly supply water from the water source. After the start of water supply to the bathtub 5, the integrated flow rate is counted by the flow sensor 32, and when it reaches a certain amount (for example, 20L), the on-off valve 34 is closed to complete the water supply.

  The details of the temperature control operation of the bathtub mixing valve 31 are the same as those of the faucet mixing valve 61 described above, and thus the description thereof is omitted.

Next, the operation when simultaneous hot water supply is performed will be described. For example, it is assumed that hot water supply is started to the bathtub 5 at a hot water supply temperature of 80 ° C. while hot water is being supplied to the faucet 7 at a hot water supply temperature of 40 ° C. The faucet mixing valve 61 is adjusted so that the temperature detected by the faucet temperature sensor 62 is 40 ° C., and a predetermined amount of hot water is supplied from the hot water channel 1 and a predetermined amount of water is supplied from the water channel 2. . At this time, when the hot water supply to the bathtub 5 is started at a hot water supply temperature of 80 ° C., the control unit 10 opens the on-off valve 34. And it tries to adjust the bathtub mixing valve 31 so that the detection temperature of the bathtub temperature sensor 32 may be 80 degreeC, and it tries to adjust the faucet mixing valve 61 simultaneously.

For example, if the temperature T2 detected by the bathtub temperature sensor 32 immediately after the start of the high-temperature hot water is 40 ° C., the deviation ΔT2> 10 ° C. from the set 80 ° C., so that the opening θ2 of the bathtub mixing valve 31 increases. In addition, high-speed driving is performed at a driving speed v2 = 15 [opening% / s]. By this operation, the amount of hot water supplied from the hot water channel 1 to the bathtub hot water channel 1 increases rapidly, so the amount of hot water supplied to the general faucet hot water supply channel 6 decreases rapidly. However, at the same time, since the opening θ1 of the faucet mixing valve 61 is driven so as to increase, the ratio of hot water to water mixed by the faucet mixing valve 61 is larger on the hot water side. Prevents an under-short of the hot water supply temperature of the general tap water flow channel 1 generated by a sudden decrease in the amount of hot water supplied to the tap water supply channel 6, or reduces the absolute amount of the undershoot and shortens the generation time. Can be realized.

Here, the driving speed v1 of the faucet mixing valve 61 'is determined according to the driving speed v 2 of the tub mixing valve 31, the absolute value is determined experimentally, but for example, 1/2 the speed of the tub mixing valve 31 It is preferable to make it slower than the drive speed of the bathtub mixing valve 31. This is because if the faucet mixing valve 61 is driven at a speed higher than the driving speed of the bathtub mixing valve 31, the influence of the operation of the faucet mixing valve 61 may occur in the bathtub hot water flow path 1.

Moreover, the control part 10 performs feedback control by the faucet temperature sensor 62 as usual in addition to the control linked to the bathtub mixing valve 31 shown above to the faucet mixing valve 61 at the start of the hot water supply. Also good. For example, the control may be performed at the drive speed v 1 ″ = v 1 + v 1 ′ obtained by adding the speed component v 1 by the normal feedback control and the speed component v 1 ′ linked to the operation of the bathtub mixing valve 31. In this case, since there is a driving speed component v 1 by normal temperature control, it is preferable that the driving speed component v 1 ′ linked to the bathtub mixing valve 31 is slower than ½ of v 1 .

  Further, the control linked to the bathtub mixing valve 31 with respect to the faucet mixing valve 61 described above is performed only when the driving speed of the bathtub mixing valve 31 is particularly high, for example, v2 = 15 [opening% / s] may be performed only during high-speed driving. In this case, since the interlocked control is performed only when the hot water flow fluctuation of the hot water flow path 1 due to the drive of the bathtub mixing valve 31 is the largest, without affecting the normal temperature control in the general faucet hot water supply path 6, Undershoot at the start of hot hot water can be improved.

  Moreover, even if the control linked to the bathtub mixing valve 31 for the faucet mixing valve 61 described above is performed only when the difference ΔT2 between the detected temperature T2 of the bathtub temperature sensor 32 and the set temperature is large, the bathtub mixing valve similarly Since the interlocked control can be performed only when the hot water flow fluctuation in the hot water flow path 1 due to the drive of 31 is the largest, the hot water supply hot water without affecting the normal temperature control in the general faucet hot water supply path 6 The undershoot at the start can be improved.

  Moreover, you may make it perform the control interlock | cooperated with the bathtub mixing valve 31 with respect to the faucet mixing valve 61 shown above only for a predetermined period, after starting a hot hot water supply. The predetermined period is determined by measuring a period in which undershoot actually occurs. In this case, the above-mentioned interlocked control can be performed reliably only when the amount of hot water supplied to the hot water flow passage 1 due to the drive of the bathtub mixing valve 31 is generated. Undershoot at the start of high-temperature hot water can be improved without affecting the temperature control.

Up to this point, when the hot water supply is started, the open / close valve 34 is opened, and then the hot water flow path 1 continuously generated while the bathtub mixing valve 31 is driven until the detected temperature T2 reaches 80 ° C. Although the fluctuation of the amount of hot water supplied from the above is described, depending on the value of the opening θ2 of the bathtub mixing valve 31,
Even when 4 is opened, undershoot / overshoot occurs. For example, consider a case where the detection temperature T2 of the bathtub temperature sensor 32 at the start of hot hot water is 90 ° C. If the temperature of the hot water in the hot water channel 1 is 90 ° C. and the temperature of the water in the water flow channel 2 is 20 ° C., the opening θ2 of the bathtub mixing valve 31 at this time is 100%. That is, at the moment when the on-off valve 34 is opened, a large amount of hot water flows from the hot water channel 1 to the bathtub hot water channel 3, and the amount of hot water supplied to the general tap water channel 6 is reduced. Undershoot occurs in the hot water supply temperature.

  Conversely, when the detected temperature T2 of the bathtub temperature sensor 32 at the start of the hot water supply hot water is 20 ° C., the opening degree θ2 of the bathtub mixing valve 31 is 0%. Conversely, a large amount of water flows from the water flow path 2 to the bathtub hot water supply path 3 at the moment when the on-off valve 34 is opened, and the amount of water supplied to the general faucet hot water supply path 6 decreases, resulting in the general faucet hot water supply path. Overshoot occurs at the hot water supply temperature of 6. Thus, the overshoot / undershoot at the moment when the on-off valve 34 opens takes the maximum value when the opening θ2 of the bathtub mixing valve 31 is significantly biased toward the hot water side and the water side as described above. . Therefore, when the opening / closing valve 34 is opened, if the opening degree θ of the bathtub mixing valve 31 is set to 50% (FIG. 2C) or the vicinity thereof, the maximum value of the influence can be suppressed.

  In the present embodiment, the case where the hot water supply to the bathtub 5 is started while hot water is supplied through the general faucet hot water supply path 6 is described as an example. From the relationship between the hot water temperature to the hot water and the hot water temperature to the bathtub 5, the phenomenon that occurs is only different, such as overshoot and undershoot. By performing the same control, overshoot / undershoot can be improved. it can.

  In the present embodiment, the case of starting hot hot water supply to the bathtub 5 during hot water supply in the general faucet hot water supply path 6 has been described as an example, but also in the case of ending hot hot water supply during simultaneous hot water supply. It is the same. For example, when closing the on-off valve 34 after driving the bathtub mixing valve 31 to the opening θ2 = 50% when the open / close valve 34 is opened and closed, when the high-temperature hot water is finished, Contrary to the start time, since the opening of the bathtub mixing valve 31 is driven to the water side at a high speed, the amount of water supplied from the water flow path 2 fluctuates and an overshoot occurs. Although there is a difference between overshoot and undershoot, the principle is the same and can be improved by performing the control of this embodiment.

  In the present embodiment, the case where the hot water supply to the bathtub 5 is started while hot water is supplied through the general tap water supply path 6 has been described as an example, but conversely, during the hot water supply to the bathtub 5, the tap 7 The same can be applied to the case where hot water supply is started.

  In the embodiment of the present invention, the bathtub hot water supply passage 3 and the general faucet hot water supply passage 3 correspond to a plurality of hot water supply passages, the bathtub mixing valve 31 and the faucet mixing valve 61 correspond to mixing valves, and the control unit 10 controls the means. It corresponds to.

  As described above, the hot water supply apparatus provided with the hot water supply temperature control device according to the present invention can quickly stabilize the hot water supply temperatures of the respective hot water supply paths even when hot water supply is simultaneously performed to a plurality of hot water supply paths. Therefore, it is possible to realize a water heater that is excellent in safety and easy to use.

The system block diagram of the hot-water supply apparatus in embodiment of this invention Configuration diagram of proportional mixing valve in the hot water supply system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water flow path 2 Water flow path 3 Bathtub hot water supply path 5 Bathtub 6 General faucet hot water supply path 7 Faucet 10 Control part 31 Bathtub mixing valve 32 Bathtub temperature sensor 34 On-off valve 61 Faucet mixing valve 62 Faucet temperature sensor

Claims (4)

A plurality of mixing valves for connecting one of the flow paths branched from the hot water flow path and one of the flow paths branched from the water flow path to a plurality of mixing valves are provided, and a plurality of detection valves detect the temperatures downstream of the plurality of mixing valves. A temperature sensor, and a control means for controlling the mixing valve disposed on the upstream side of the temperature sensor based on the output of the temperature sensor, and when the plurality of mixing valves are controlled simultaneously, A hot water supply temperature control device, wherein a control amount of a previously operated mixing valve is determined based on a control amount of the operated mixing valve . The control means is characterized in that the control amount of the mixing valve operated later is reflected in the control amount of the mixing valve operated earlier only when the operating speed of the mixing valve operated later is equal to or higher than a predetermined speed. The hot water supply temperature control device according to claim 1 . Control means, after a predetermined time period from the start of operation of the mixing valve is operated only, the control amount of the mixing valve which is operated after, characterized in that is reflected in the control amount of the mixing valve which is operated above claims Item 3. A hot water supply temperature control device according to any one of Items 1 or 2 . The control means sets the control amount of the mixing valve operated later only when the difference between the detected temperature of the temperature sensor detecting the tapping temperature of the mixing valve operated later and the control target temperature is larger than the predetermined temperature difference. The hot water supply temperature control device according to any one of claims 1 to 3 , wherein the hot water temperature control device is reflected in a control amount of the previously operated mixing valve.

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