JP3987271B2 - Bathtub water level control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bathtub water level control device that controls a bathtub water level to a set water level or the like.
[0002]
[Prior art]
Conventionally, the water level of a bathtub can be detected using a pressure sensor. The pressure detected by this pressure sensor varies depending on the water flow flowing in the pipe. For example, two memorial pipes are connected to the bathtub, but a pressure sensor is attached to one of the pipes, and the water is supplied to the bathtub through the other pipe. It has been done to avoid.
[0003]
To control the water level of the bathtub, after supplying clean water to the memorial circuit, priming water to the circulation pump, flowing clean water to the pipe side where the pressure sensor is attached, and interposing the water between the bathtub and the pressure sensor. By connecting them, a pressure representing the water level in the bathtub is applied to the pressure sensor. The detected pressure at this time is stored in the memory as the initial water level pressure, and water supply is resumed from the other pipe. When the water level reaches the circulation port of the bathtub, the detected pressure value increases, and from this pressure increase, it can be confirmed that the circulation port is submerged. Here, water supply is stopped, water is supplied to the pressure sensor side pipe line, or pump circulation is performed to discharge residual air in the pipe line. Then, the water level pressure indicating that the circulation port is completely submerged is stored in the memory. Using this detection position as the specific water level from the bottom of the bathtub, the difference to the set water level is calculated, and water is supplied from one of the pipes again. When a pressure value indicating the set water level is detected, water supply is stopped.
[0004]
[Problems to be solved by the invention]
By the way, when the water level control of the bathtub is performed using the detection pressure of the pressure sensor, it is necessary to apply the water level pressure of the bathtub to the pressure sensor, and the air in the pipe line on the pressure sensor side is detected every time the water level is detected. It is necessary to discharge it. For this air discharge, it is necessary to use a plurality of three-way valves and four-way valves to seal water in the pipe, and it is necessary to open and close the water supply opening / closing valve in accordance with the flow path switching. The on-off valve is driven by a motor, and it is also necessary to detect the opening state of the on-off valve. In order to discharge air in this way, a complicated control mechanism is required, the number of parts for that purpose is large, and the control operation time causes the boiling time to be delayed.
[0005]
Then, this invention makes it a subject to provide the bathtub water level control apparatus which implement | achieved the simplification and speeding-up of water level control.
[0006]
[Means for Solving the Problems]
The bathtub water level control device of the present invention includes a water amount sensor (water supply amount sensor 46) that measures the amount of water supply, a pressure sensor (24) that detects pressure acting on the recirculation circuit, and a control means (control unit 100) that controls the water supply. ), Controlling the water supply according to the detected pressure, and a first water amount (Q) up to a reference water level at which the circulation port (circulation connector 10) of the bathtub (4) is submerged.₁) And the reference water level (h₁) To the set water level (hset)₂), Water level difference between the reference water level and the set water level (h₂) Is stored and the first water amount, the second water amount, or the insufficient water amount from the current water level to the set water level is supplied to the bathtub according to the current water level in the bathtub, thereby simplifying and speeding up the water level control. Is realized.
[0007]
  The bathtub water level control device of the present invention according to claim 1 is a bathtub water level control device for supplying water to the bathtub through the circulation port (circulation connector 10) of the bathtub (4).A pipe that guides bathtub water from the circulation port of the bathtub to the heat exchanger for remedy (16) and returns the bathtub water that has passed through the heat exchanger for remedy from the circulation port of the bathtub to the inside of the bathtub. A pump (18) is connected to the (return pipe 12), and a recirculation circuit for circulating the bathtub water by the pump and a water supply pipe (27) and connected to the recirculation circuit for hot water supply. A heat exchanger (28) is installed, a check valve (44) for preventing a reverse flow of the bath water from the memorial circuit is installed, and water from the water supply pipe is supplied to the heat exchanger for hot water supply. Pour into the bathtub from the memorial circuitWater supply pipe (hot water supply pipe 26) and the water supply pipeInstalled inA water amount sensor (water supply amount sensor 46) for measuring the amount of water supplied to the bathtub;Provided in the memorial circuit, receiving the water level pressure of the bathtub through the memorial circuit,A pressure sensor (24) for detecting the pressure representing the water level;A water amount control valve (36) installed in the water supply pipe to control the amount of water supply, a water supply valve (40) installed in the water supply pipe to control the water supply, and the water supplyA water level slightly higher than the water level at which the circulation port is submerged is a reference water level, a set water level representing the water level set in the bathtub, a water supply amount until the circulation port is submerged is a first water amount, and the bathtub from the reference water level The amount of water supply until reaching the set water level set to the second water amount, the difference in water level between the reference water level and the set water level is obtained, the reference water level, the set water level, the first water amount, Whether or not the second water amount and the water level difference are stored in the storage means, and the detected pressure at the start of water supply exceeds the reference water levelJudgingWhen the detected pressure does not exceed the reference water levelOpen the water supply valveSupplying the first amount of water;By controlling the water amount control valve,The second water amount is supplied from the reference water level, the insufficient water amount is obtained from the detected water level and the difference in water level at that time, the insufficient water amount is supplied to the bathtub from the water supply pipe, and When the detected pressure exceeds the reference water level,By opening the water supply valve and controlling the water amount control valve,Control means (control unit 100) for supplying water from the current water level to the set water level to the bathtub from the water supply lineWhen the water supply is controlled based on the pressure detected by the pressure sensor, the control means supplies water to the bathtub with a predetermined flow rate lower than the maximum flow rate, and based on the first and second water amounts. When controlling the water supply, water is supplied to the bathtub at the maximum flow rate, the water supply flow rate to the bathtub is regulated by the water amount control valve, and the static pressure value in the bathtub is determined by the water supply flow rate and the detected pressure in the water supply. Calculate and control the water supply using this static pressure valueIt is characterized by that.
[0008]
  With such a configuration, the static pressure value on the bathtub side is calculated from the detected pressure of the pressure sensor, water is supplied to the reference water level where the circulation port installed at the specific position of the bathtub is submerged, and the set water level is set with the reference water level as the control reference. To control the water level. Based on this water level control, the water amount up to the reference water level and the water amount up to the set water level can be measured and stored, and the control can be shifted from the water level control based on the detected pressure to the control based on the water amount value. In addition, it is possible to control the water supply by detecting the static pressure value and calculating the amount of insufficient water up to the set water level. As a result, the water level control can depend on a water amount sensor with a small fluctuation error in the supply water pressure, and water can be supplied at the maximum flow rate so that the bathtub water level can quickly reach the set water level. As a result, accurate water level control can be realized even if the flow path switching valve or the like of the circulation pipe is omitted, the set water level can be reached, and the configuration for water level control can be simplified.
  The influence of the pressure fluctuation error due to the water supply can be limited to the maximum flow rate that can be suppressed, and the water level can be controlled to a desired level. In addition, it is possible to control to the desired water level by shifting to the control by the water amount sensor, and to control the water level to a desired level. The amount of hot water can be increased.
  It is possible to control to a desired water level by limiting the maximum flow rate that can suppress the influence of pressure fluctuation error due to water supply. In addition, the control can be performed by the water amount sensor so that the water is supplied at the maximum flow rate and controlled to a desired water level.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of a bathtub water level control device of the present invention, FIG. 1 shows a piping configuration of a hot water supply / remedy device, and FIG. 2 shows a hot water supply / remedy control unit thereof.
[0012]
In the hot water supply / remedy device 2 for replenishing water supply, hot water supply, and bathtub water, a remedy section 6 for pursuing the bathtub water 5 of the bathtub 4 and the water W are supplied to the bathtub 4 or heated. And a hot water supply section 8 for supplying hot water.
[0013]
The memorial circuit 6 is constructed by connecting the circulation connector 10 that is the circulation port of the bathtub 4 and the heat exchanger 16 to the memorial unit 6 through two pipes of the return pipe 12 and the forward pipe 14. Yes. In this memorial circuit, a relatively thin metal pipe is used in order to increase the water supply speed by the pump 18 and ensure the stirring power of the bath water 5. In the return pipe 12, a pump 18 for conveying the bathtub water 5, the presence / absence of circulating water generated by the pump 18, the operation of the pump 18, and the running water switch as means for detecting the presence / absence of the bathtub water 5 are detected. 20. A temperature sensor 22 for detecting the temperature of the circulating bath water 5 and a pressure sensor 24 for detecting the water level pressure in the bathtub 4 are provided, and a hot water supply pipe 26 on the hot water supply section 8 side is directly connected.
[0014]
Further, the hot water supply unit 8 includes a heat exchanger 28 for heating the clean water W supplied from the water supply pipe 27, a water supply temperature sensor 30 for detecting the water supply temperature, a water supply amount sensor 32 for detecting the water supply amount, and a heat exchanger 28. A hot water temperature sensor 34 for detecting the hot water temperature of the hot water and a water amount control valve 36 for regulating the feed water flow rate to a predetermined flow rate are provided. The hot water supply pipe 26 is branched from a pipe 38 for external hot water supply of the hot water HW, such as a kitchen, a washstand, and a shower. The hot water supply pipe 26 depends on the pressure of the water supply valve 40 for supplying water to the bathtub 4 or hot water, the hopper for cutting off the clean water W and the bathtub 4 side, the edge cutting device 42 such as a vacuum breaker, and the pressure of the pump 18 on the side of the remedy section 6 A check valve 44 for preventing the back flow of hot water and a water supply sensor 46 for detecting the amount of water supplied to the bathtub 4 side are provided.
[0015]
Burners 48 and 50 are installed in the heat exchangers 16 and 28 as heating means for burning and heating the fuel gas G, and the fuel gas G is supplied to the burners 48 and 50 through the fuel pipe 52. The fuel pipe 52 is provided with a main valve 54, an on-off valve 56 on the burner 48 side, and an on-off valve 58 and a proportional valve 60 on the burner 50 side. Spark plugs 62 and 64 for igniting the fuel gas G are provided at the crater portions of the burners 48 and 50.
[0016]
As shown in FIG. 2, the hot water supply / remembrance control unit includes a control unit 100 that controls each of hot water supply and renewal, and the control unit 100 calculates detection data and program data, and performs control. A control calculation unit 102 that outputs an output is provided. The control operation unit 102 includes a CPU 104 that performs operation control, a ROM 106 that is a read-only memory that stores operation programs and operation reference data, and a rewritable memory that stores operation data, detection values from sensors, and operation data. A RAM 108, an analog / digital (A / D) converter 110 that converts analog data such as voltage into digital data, an input port 112 as an input interface, and an output port 114 as an output interface are provided.
[0017]
The A / D converter 110 is provided with a detection range setting circuit 116 that amplifies the output voltage of the sensor and determines an upper limit value and a lower limit value that are A / D conversion ranges. Various sensors such as the sensor 24, the feed water temperature sensor 30, the hot water temperature sensor 34, the temperature sensor 22 and the like are connected and a detection output is applied. The water supply amount sensors 32 and 46 and the running water switch 20 are connected to the input port 112 through a detection circuit 118. The output port 114 is provided with a main valve 54, on-off valves 56 and 58, a proportional valve 60, spark plugs 62 and 64, a water supply valve 40, a water amount control valve 36, and a pump 18 through a drive circuit 120. In addition, a receiving circuit 122 is connected to the input port 112, and a transmitting circuit 124 is connected to the output port 114. The receiving circuit 122 and the transmitting circuit 124 are linked to the external remote control device 130 by wire and wirelessly, and combustion control data, a bathtub Various data such as various control data, various setting data, failure information, and time are exchanged.
[0018]
The external remote controller 130 is used to input setting data such as hot water supply temperature, remedy temperature, water level, time, and boiling time, and operation commands such as operation standby, automatic hot water operation, additional hot water operation, and remedy operation. A switch 132 is provided, and liquid crystal, a fluorescent display tube, an LED, etc. are used as display means for displaying various setting data and various operation states such as combustion control, water level control, and failure information transmitted from the control unit 100 with characters, figures, etc. The indicator 134 which consists of is provided.
[0019]
Next, the operation will be described. FIG. 3 shows water supply (including hot water supply) to the bathtub 4. When the water supply valve 40 is opened, the clean water W flows from the hot water supply pipe 26 through the return pipe 12 to the bathtub 4 through the heat exchanger 28, and from the return pipe 12 through the heat exchanger 16 to the bathtub 4 from the forward pipe 14, That is, water is supplied to the bathtub 4 through two pipe lines. A water supply amount to the bathtub 4 is measured by a water supply amount sensor 46. The water supply amount sensor 46 counts pulses when the impeller rotates due to the water flow, and calculates and measures the water supply flow rate and the water supply amount. Further, the detection output of the water supply amount sensor 46 can be monitored, and the water amount control valve 36 can be operated to control it to a predetermined water supply flow rate.
[0020]
When water supply to the bathtub 4 or the outside of the bathtub 4 is confirmed from the detection output of the water supply amount sensor 32, the spark plug 64 is discharged, the main valve 54 and the on-off valve 58 are opened, and the proportional valve 60 is operated to the ignition opening degree. Thus, the fuel gas G is supplied to the burner 50, and combustion is started. The amount of combustion in the burner 50 is adjusted by detecting the temperature of the hot water from the heat exchanger 28 and comparing it with the set temperature and adjusting the opening of the proportional valve 60 so as to match the set temperature. Further, the maximum water supply flow rate Q that can be controlled by the control calculation unit 102 from the water supply temperature and the set temperature to the set temperature._MAXIs calculated. This maximum water supply flow rate Q_MAXThe opening adjustment of the water amount control valve 36 is performed while confirming the water supply flow rate detected by the water supply amount sensor 32 so as to match the above. In this case, it can also be adjusted to a desired water supply flow rate. When the hot water supply according to the hot water supply request from the outside is performed, the water amount control valve 36 is set to a desired water amount by the detection output of the water supply amount sensor 32, and when supplying water to the bathtub 4, the detection output of the water supply amount sensor 46. You may make it control.
[0021]
When only one of the return pipe 12 and the forward pipe 14 is used, the pressure loss is high, and a thin metal pipe is used to increase the water supply speed by the pump 18 and ensure the stirring power of the bath water 5. Therefore, the loss becomes larger and the water supply flow rate is greatly limited. Therefore, by supplying water from the hot water supply pipe 26 using both the return pipe 12 and the forward pipe 14, the water supply capacity is increased, the pressure loss is reduced, and the water supply amount is increased.
[0022]
At the time of water supply, since the water supply passes through the return pipe 12 to which the pressure sensor 24 is attached, the detected pressure exhibits a value obtained by adding the increase in water supply to the static pressure value corresponding to the water level of the bathtub 4. The value fluctuates greatly due to the influence, and an accurate value cannot be obtained. This detected pressure cannot be used for water level control. Therefore, the maximum water supply flow rate Q that can control the pressure fluctuation due to the water supply by operating the water amount control valve 36._MAXThe static pressure value corresponding to the water level of the bathtub 4 is obtained by removing the increase in water supply from the detected pressure value, and this value is used for water level control.
[0023]
For example, the following method is used to remove the fluctuation error due to water supply from the pressure detected by the pressure sensor 24. That is, in order to calculate an accurate static pressure value, the detected pressure value is sampled from the A / D converter 110 every predetermined time and stored in the RAM 108. The RAM 108 has an area for storing a plurality of detected pressure data, for example, a storage area capable of storing up to 10 pieces of the data, and the data is sequentially stored in the storage area every sampling. Then, every time sampling is performed, data is sequentially updated so that the detected pressure stored first in the storage area is rewritten to the latest detected pressure. From these data groups, the average value is obtained from the remaining 8 data excluding the maximum and minimum values of the detected pressure, the fluctuation error is eliminated, this is stored in the RAM 108 as the detected pressure, and the static pressure is detected from this detected pressure value. The pressure value is calculated and used for water level control.
[0024]
Since the bathtub 4 is installed at an arbitrary height such as the first floor or the second floor of the house, in order to cope with this, the maximum height difference between the circulation connector 10 which is the circulation port of the bathtub 4 and the pressure sensor 24 is set. For example, it is about 5 m. The output voltage range of the pressure sensor 24 corresponding to this maximum altitude difference is amplified so as to be output within a predetermined voltage range by the detection range setting circuit 116, and an upper limit value and a lower limit value for water level measurement are set. The predetermined voltage range output from the detection range setting circuit 116 is decomposed by the 8-bit A / D converter 110 and converted into a digital value. The resolution of the A / D converter 110 is a water level of about 2 cm. If the water level difference in this resolution is set large, the pressure fluctuation amount at the time of sampling is smoothed. The pressure detected by the pressure sensor 24 is converted into a digital value by A / D conversion, and then stored in the storage area of the RAM 108 to obtain an average value. The value of A / D conversion data representing the feed water fluctuation value is subtracted from the detected pressure which is the average value, and A / D conversion data Dx representing the static pressure value is stored and used for water level control.
[0025]
The circulation connector 10 of the bathtub 4 is attached to a predetermined position from the bottom surface of the bathtub 4, and this attachment position is a reference for water level measurement. As this reference, the mounting position can be detected by the detected pressure of the pressure sensor 24, and control to the set water level is possible using the detected pressure. Therefore, if the water level difference is calculated from the set water level data sent from the external remote control device 130 and the water level of the circulation connector 10, the A / D conversion value corresponding to the water level difference is calculated, and water is supplied from the reference water level. It can be controlled to the set water level. For example, assuming that the A / D conversion value corresponding to the reference water level is D50, if the water level difference up to the set water level is 40 cm, water may be supplied until D70 where the A / D conversion value increases by 20 is detected. If the A / D conversion value of the detected water level is D60, it can be calculated that the water level difference from the circulation connector 10 is 20 cm. As described above, the detected pressure at the position of the circulating connector 10 can be used to calculate the water level difference necessary for the control to the set water level and the calculation of the water level control.
[0026]
In addition, in order to eliminate the detection error due to air mixing into the return pipe 12, the position where the circulation connector 10 is completely submerged is set as the reference water level. When the circulating connector 10 begins to submerge as the water level rises, the detected pressure value starts to rise. The water level is raised by a predetermined amount, and the circulation connector 10 is submerged, and this is set as a reference water level. That is, the water level that is raised by Δh from the position of the circulation port is the reference water level h.₁It is set as. Therefore, from the set water level hset to the reference water level h₁Water level difference h up to (water level representing the circulation port of the circulation connector 10 + Δh)₂The water level is controlled for
[0027]
In addition, in the water level control, the reference water level h₁1st water quantity Q until₁(Reference water volume) and reference water level h₁To the set water level hset₂Is used for the next hot water filling control. At this time, the maximum water supply flow rate Q from the two pipelines of the memorial circuit_MAXWater can be supplied at, and the filling time can be shortened.
[0028]
Next, FIG. 4 shows the tracking control of the bathtub water 5. When the temperature of the bath water 5 is lower than the set temperature, a chasing operation is performed to recover the set temperature Tset. Circulating water is generated by driving the pump 18, and this is confirmed by the water switch 20. After detecting the flowing water, the main valve 54 and the on-off valve 56 are opened, the fuel gas G is supplied to the burner 48, the ignition plug 62 is discharged, and additional combustion is started. The hot water pumped by the pump 18 is heated by the heat exchanger 16 and refluxed into the bathtub 4, and the bathtub water 5 is stirred and boiled up uniformly. The temperature of the bathtub water 5 in the bathtub 4 is detected by the temperature sensor 22. When this detected temperature reaches the set temperature Tset set by the external remote controller 130, the on-off valve 56 and the main valve 54 are closed and the pump 18 is stopped.
[0029]
Since the return pipe 12 and the forward pipe 14 use relatively narrow pipelines than the hot water supply pipe 26 in order to obtain a flowing water speed at which the bathtub water 5 can be sufficiently stirred by the pump 18, when circulating water is generated by the pump 18. A force that flows backward from the memorial circuit to the hot water supply pipe 26 side acts. The hot water supply pipe 26 is provided with a check valve 44 and an edge cutting device 42 to prevent the back flow of hot water from the pump 18.
[0030]
  Next, FIG. 5 shows changes in the pressure value, the water level, and the amount of water in the water level control of the hot water supply / remedy device 2. The water supply valve 40 is opened by an initial hot water filling operation command, and an initial operation mode for measuring the amount of water corresponding to the water level is started. Obtain the static pressure value before the water level reaches the reference water levelOf pressure used forDetection occurs and time t₁During this period, the water flow control valve 36 is operated to supply water flow q₁At this time, water supply pressure p₁Is detected. Then time t₂During this period, the water flow control valve 36 is operated to supply water flow q₂At this time, water supply pressure p₂Is detected. Supply water flow q₂Is the maximum water supply flow rate that can suppress errors due to fluctuations in the water supply during pressure detection. Thereafter, the static pressure value P is calculated from the equation (1), and the control proceeds to the water level control by the static pressure value P from the point a.
[0031]
P = p₂-(P₂-P₁) / (Q₂ ² -Q₁ ² (1)
[0032]
When the water level of the bathtub 4 reaches the circulation connector 10 due to the water supply, the water supply pressure and the static pressure value start to rise. From here, the water level is raised by Δh. Time t_ThreeElapses, and the pressure value P corresponding to the submerged position of the circulation connector 10 at point b_ThreeWhen 'is reached, water supply is stopped. The pressure fluctuation is calmed by this water supply stop, and the pressure sensor 24 has a pressure value P shown at point c._ThreeIs detected. Time t_FourThe calculated static pressure value P during_Three'And static pressure value P_ThreeAnd ΔC is stored in the RAM 108 as a correction value. Thereafter, the static pressure value P is obtained by adding the correction value ΔC to the static pressure value obtained by the equation (1), and this is used for water level control.
[0033]
Also, the reference water level h₁And pressure value P_ThreeIs stored in the RAM 108, and the total water supply amount so far, that is, the first water amount Q₁Is stored in the RAM 108. Thereafter, the first water quantity Q₁Is the reference water volume.
[0034]
And time t_FourAfter the elapse of time, water supply is resumed and the water supply flow q₂Water supply flow rate Q that can limit water supply and suppress fluctuations in water supply_MAXSupply water at. Time t_FiveElapses from the set water level hset to the specified water level h_FourWhen the point d corresponding to the low water level is reached, the water supply is stopped and the reference water level h₁Water level difference from point to point d_ThreeAnd water quantity Q_ThreeIs stored in the RAM 108.
[0035]
Time t₆Deficient water quantity Q from point d water level to set water level hset_FourTo calculate the maximum water supply flow rate Q_MAXAt time t₇The water level of the bathtub 4 is controlled to the set water level. The amount of water shortage up to the set water level is calculated from the already obtained data, and it is confirmed whether or not the set water level has been reached by comparing with the actual static pressure value after water supply. Insufficient water volume Q to set water level hset_FourIs calculated using equation (2).
[0036]
Q_Four= (Hset -h_Four) × Q_Three/ H_Three    (2)
[0037]
Quantity of water Q_FourAfter supplying water, check whether the set water level hset has been reached. If the set water level has not been reached, water is supplied by calculating the amount of water corresponding to the water level difference. This is repeated until the set water level hset is reached, and the water level eventually reaches point e. Therefore, the reference water level h₁Water quantity Q measured from to the set water level hset_ThreeAnd water quantity Q_FourAnd add 2nd water quantity Q₂Water level difference h₂At the same time, it is stored in the RAM 108. After that, water level difference h₂And water quantity Q₂Is used as a calculation parameter for water level control. In this manner, the detected pressure of the pressure sensor 24, that is, the water level control based on the detected water level is switched to the water amount control for supplying water by obtaining the insufficient water amount from the set water level, and the water supply to the set water level hset is accurately performed by eliminating the fluctuation error. The amount can be measured.
[0038]
Next, the control operation will be described. FIG. 6 shows a flowchart of water level control. In the routine shown in step S1, it is determined whether or not to perform the initial setting operation. The initial setting is executed when various measurement data such as the water level and the amount of water stored in the RAM 108 are lost at the time of new operation, at the time of power failure, or at the time of replacement of the control board. When this initial setting operation is not performed, that is, when the control unit 100 enters the control operation state based on the input detection of the operation standby switch (switch 132) of the external remote control device 130, various measurement data in the RAM 108 are normally read. If it is possible, the process proceeds to the normal water level control mode in step S7.
[0039]
In the routine of step S2, the process shifts to the initial setting mode. In this initial setting mode, the reference water level h is based on the pressure detected by the pressure sensor 24.₁The water supply is controlled to the set water level hset. In the operation standby state, the initial set water level hset = 0 stored in the ROM 106 is read out and transferred to the external remote controller 130, and displayed on the display 134. By operating the setting switch (switch 132) in this state, it can be changed to an arbitrary set water level hset and set. Then, the water level control to the set water level hset is started together with the input of the automatic hot water filling switch (switch 132).
[0040]
In step S3, the reference water level h is detected by the pressure detected by the pressure sensor 24.₁Water supply control and water volume Q₁Measure. In this case, water supply flow rate q₁To q₂At this time, the detected pressure value p₁, P₂Is sampled and stored in the RAM 108, and the static pressure value P is calculated. Thereafter, the static pressure value P is calculated from the detected pressure value detected by time division, and the reference water level h₁Control the water supply to the pressure value P_ThreeAnd water volume Q₁Remember. As a result of the hot water supply to the outside, the amount of water supplied to the bathtub 4 is a predetermined flow rate q.₁Or q₂May be less than In this case, after canceling the initial setting mode, the water amount Q stored in the ROM 106₁And water volume Q₂The hot water filling is finished by supplying hot water to the bathtub 4 based on the above.
[0041]
In step S4, the water level h is set from the set water level hset._FourOnly low water level (h_Three+ H₁) Is used as the target water level. This target water level is a water level determined according to the set water level. At this time, water supply flow rate q₂Supply water at. Also, the water supply amount is measured simultaneously with the water level control._ThreeAnd water level difference from the reference water level h_ThreeIs temporarily stored in the RAM 108. Further, the water level difference and the water supply amount may be stored in the RAM 108 after the water supply to the set water level.
[0042]
In step S5, the water shortage Q up to the set water level hset_FourIs calculated and water supply control is performed. Water shortage Q_FourIs calculated from equation (2). At this time, the maximum water supply flow rate Q_MAXThe water amount control valve 36 is controlled to supply water. After the end of water supply, the static pressure value P is detected again from the pressure sensor 24, and it is confirmed whether or not the set water level hset has been reached. If the set water level has not been reached, supply the deficient water amount and repeat until the set water level is reached.
[0043]
In step S6, the reference water level h₁Water amount Q from each water supply amount to the set water level hset₂Is stored in the RAM 108. Also, the reference water level h₁Water level difference h from the set water level hset₂Is also stored in the RAM 108 in the same manner. These water quantities Q₂And water level difference h₂Is used to calculate the amount of water shortage from the next water supply to the set water level.
[0044]
Step S7 shows a normal water level control mode, in which water quantity Q₁, Q₂And water level difference h₂As the control parameter_MAXWater supply is controlled at
[0045]
In step S8, the water amount Q as the reference water amount₁It is determined whether or not the water supply control is performed. Quantity of water Q₁In other words, the detected water level by the pressure sensor 24 is the reference water level h.₁When it is lower, or when the circulating water is not detected by the water flow switch 20 by driving the pump 18, it is assumed that there is no bathtub water 5 in the bathtub 4, and the flow proceeds to step S9 and the amount of water Q₁Water supply control. The amount of water Q₁If the water supply control is not, i.e., if the water level in the bathtub 4 is less than the set water level and exceeds the reference water level, or if circulating water by the pump 18 is confirmed, the process proceeds to step S12.
[0046]
In step S9, water quantity Q₁Supply water. The water supply flow rate is controlled by the water amount control valve 36._MAXHas been adjusted. For this reason, water supply can be quickly controlled to the reference water level.
[0047]
In step S10, the water amount Q as the control water amount₂It is determined whether or not to perform water supply control. Quantity of water Q₂Water supply control, that is, water volume Q₁If the water level does not exceed the reference water level ± α, it is determined that there is no residual water in the bathtub 4, and the process proceeds to step S11. Further, when the set water level hset is changed and the set water level cannot be reproduced by the control water amount, the process proceeds to step S11. The amount of water Q₂When water supply control is not performed, that is, when the reference water level exceeds ± α, the water amount Q₁It is determined that the residual water in the bathtub 4 has been added to step S12.
[0048]
In step S11, the amount of water Q₂The maximum water supply flow rate Q_MAXSupply water at, and quickly reach the set water level hset.
[0049]
In step S12, the water level difference hx from the static pressure value detected by the pressure sensor 24 to the set water level is calculated, and the water amount Q₂And water level difference h₂To calculate the amount of water shortage Qx.
[0050]
Qx = (hset−hx) × Q₂/ H₂    .... (3)
Maximum water supply flow rate Q according to this shortage water quantity Qx_MAXBy supplying water at, the water level of the bathtub 4 is controlled to the set water level hset.
[0051]
It should be noted that the initial setting mode may be repeated a plurality of times, an average value of each detected pressure, water level difference, water amount, etc. may be obtained to eliminate the water supply fluctuation error and used as a water level control parameter in the normal water level control mode. Further, the initial setting mode may be repeated until various measurement values are matched a plurality of times. In addition, the initial setting mode may be operated every time the set water level is changed, and the water amount measured for each set water level may be stored and held in the RAM 108 as a data group.
[0052]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
a To maintain accurate detection by the pressure sensor, a switching valve for switching the flow path between the memory circulation path and the water supply path can be eliminated, which contributes to simplification of the configuration. Further, the water supply time by the switching operation can be saved, and the hot water filling can be accelerated accordingly.
b The static pressure value excluding fluctuations in the detected pressure due to the water supply can be obtained by calculation to perform water level control, and the hot water filling control can be performed while avoiding the effect of pressure loss in the additional circulation circuit.
c After the water level control by the pressure sensor, the set water level can be reliably reproduced by shifting to the water level control by the amount of water with a small measurement error, and the water can be supplied at the maximum water supply flow rate. it can.
[Brief description of the drawings]
FIG. 1 is a piping configuration diagram showing a hot water supply / remedy device that is an embodiment of a bathtub water level control device of the present invention.
FIG. 2 is a block diagram illustrating a hot water supply / remembrance control unit of the hot water supply / remembrance device.
FIG. 3 is a diagram showing a hot water supply operation to a bathtub.
FIG. 4 is a diagram illustrating a bath water pursuit operation.
FIG. 5 is a graph showing changes in pressure, water level, and water volume in water level control.
FIG. 6 is a flowchart showing a water level control operation.
[Explanation of symbols]
2 Hot water supply / memorial equipment
4 Bathtub
5 Bath water
10 Circulation connector (circulation port)
12 Return pipe
14 Outward pipe
24 Pressure sensor
36 Water control valve
46 Water supply sensor
100 Control unit (control means)

Claims (1)

A bathtub water level control device for supplying water to the bathtub through a circulation port of the bathtub,
A pump is connected to a pipe line that guides bathtub water from the circulation port of the bathtub to the heat exchanger for remedy, and returns the bathtub water that has passed through the heat exchanger for remedy from the circulation port of the bathtub to the inside of the bathtub. A memorial circuit for connecting and circulating the bathtub water by the pump;
Connected to the water supply pipe and connected to the additional circulation circuit, a hot water supply heat exchanger is installed, a check valve for preventing a reverse flow of the bathtub water from the additional circulation circuit is installed, and the water supply pipe A water supply pipe for pouring the clean water from the hot water supply heat exchanger into the bathtub from the memorial circuit;
A water amount sensor that is installed in the water supply pipe and measures the amount of water supplied to the bathtub;
A pressure sensor provided in the remedy circuit, receiving a water level pressure of the bathtub through the remedy circuit, and detecting a pressure representing the water level in the bathtub ;
A water amount control valve that is installed in the water supply line and controls the amount of water supply;
A water supply valve installed in the water supply pipe for controlling the water supply;
The water level slightly higher than the water level at which the circulation port is submerged by the water supply, the reference water level, the set water level representing the water level set in the bathtub, the water supply amount until the circulation port is submerged, the first water amount, the reference water level The water supply amount until the set water level set in the bathtub is reached is a second water amount, and a water level difference between the reference water level and the set water level is obtained, and the reference water level, the set water level, the first water level are determined. water, said second amount of water, the stores the water level difference in the storage means, detecting the pressure at the start of the water supply is determined whether it exceeds the reference level, when the detected pressure does not exceed the reference level The water supply valve is opened to supply the first water amount, and the second water amount is supplied from the reference water level by controlling the water amount control valve. From the detected water level and the water level difference at that time Find the amount of water shortage Foot water is water in the tub from the water supply conduit, and when the detected pressure during the water supply start exceeds the reference water level, by controlling the water amount control valve is opened the water supply valve A control means for supplying water from the water supply line to the bathtub from the current water level to the set water level,
The control means comprises
When controlling the water supply based on the pressure detected by the pressure sensor, the water supply is limited to a predetermined flow rate lower than the maximum flow rate, and the water is supplied to the bathtub, and the water supply is controlled based on the first and second water amounts. Supply water to the bathtub at the maximum flow rate,
A water supply flow rate to the bathtub is regulated by the water amount control valve, a static pressure value in the bathtub is calculated from the water supply flow rate and a detected pressure in the water supply, and the water supply is controlled using the static pressure value. Bath water level control device.

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