Hot water mixing device

Abstract

To provide a hot water mixing device that exhibits excellent temperature stability even when differential pressure between water supply pressure and hot water supply pressure occurs.SOLUTION: A hot water mixing device 1 executes: first control for changing a flow rate in a plurality of stages between a predetermined flow rate of hot water mixed water and a set flow rate QS and setting a flow rate of the hot water mixed water in each stage as a target flow rate; second control for, on the basis of the target flow rate, a set temperature TS, a water measurement flow rate QC, and a hot water measurement flow rate QH, calculating target flow rates of water and hot water in each stage, calculating and updating the target flow rate of the hot water on the basis of the water measurement flow rate QC when a valve opening of a water side flow regulating valve is equal to or larger than that of a hot water side flow regulating valve, and calculating and updating the target flow rate of the water on the basis of the hot water measurement flow rate QH when the water side valve opening is smaller than the hot water side valve opening; and third control for changing valve opening / closing speed of the water side flow regulating valve in accordance with a difference between the calculated target flow rate and the measurement flow rate QC of the water and changing valve opening / closing speed of the hot water side flow regulating valve 4H in accordance with a difference between the calculated target flow rate and the measured flow rate QH of the hot water.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a hot and cold water mixing device. [Background technology]

[0002] Patent Document 1 discloses a conventional hot and cold water mixing device. This hot and cold water mixing device is equipped with a water temperature sensor, a water-side flow rate adjustment unit, a hot water temperature sensor, a hot water-side flow rate adjustment unit, and a control unit. The water temperature sensor is provided in a water supply passage that supplies water to the water outlet. The water-side flow rate adjustment unit adjusts the water flow rate in the water supply passage. The hot water temperature sensor is provided in a hot water supply passage that supplies hot water to the water outlet. The hot water-side flow rate adjustment unit adjusts the hot water flow rate in the hot water supply passage. The control unit operates the hot water-side flow rate adjustment unit and the water-side flow rate adjustment unit. The water-side flow rate adjustment unit and the hot water-side flow rate adjustment unit each have a constant flow valve with a diaphragm valve mechanism. In this hot and cold water mixing device, when a disturbance occurs that causes a fluctuation in the pressure in the primary flow passage, the constant flow rate valve operates to maintain a constant flow rate, thereby controlling the temperature and flow rate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-183986 Summary of the Invention [Problem to be solved by the invention]

[0004] The hot and cold water mixing device of Patent Document 1 maintains a constant flow rate by balancing the forces acting on the diaphragm portion due to the pressure in the first pressure chamber and the pressure in the second pressure chamber of the diaphragm valve mechanism. Therefore, this hot and cold water mixing device has a complex flow path, and there is a risk that it will take a long time for the temperature to stabilize when the pressure in the primary flow path fluctuates. This hot and cold water mixing device does not take into account the difference between the cold water pressure and the hot water pressure, the so-called differential pressure.

[0005] The present disclosure has been made in consideration of the above-mentioned conventional situation, and aims to solve the problem of providing a hot and cold water mixing device that has excellent temperature stability even when a pressure difference occurs between the water supply pressure and the hot water supply pressure. [Means for solving the problem]

[0006] The hot water and water mixing device of the present disclosure includes a mixing water channel, a mixing section to which the upstream end of the mixing water channel is connected, a water supply channel having a downstream end connected to the mixing section and supplying water toward the mixing section, a hot water supply channel having a downstream end connected to the mixing section and supplying hot water toward the mixing section, a water temperature sensor, a water side flow meter, and a water side flow rate adjustment valve provided in the water supply channel, a hot water temperature sensor, a hot water side flow meter, and a hot water side flow rate adjustment valve provided in the hot water supply channel, a setting section to set a set flow rate and a set temperature of the hot water and water mixed water flowing through the mixing water channel, and a control section to control the water side flow rate adjustment valve and the hot water side flow rate adjustment valve, and the control section includes a first control that changes the flow rate of the hot water and water mixed water in multiple steps between a predetermined flow rate of the hot water and water mixed water and the set flow rate, and sets the flow rate of the hot water and water mixed water for each step to a target flow rate of the hot water and water mixed water, and a second control that changes the flow rate of the hot water and water mixed water in multiple steps to a target flow rate of the hot water and water mixed water for each step. and a second control that calculates a target flow rate of water flowing through the water supply passage and a target flow rate of hot water flowing through the hot water supply passage based on the target flow rate, the set temperature, the measured flow rate of water measured by the water-side flow meter, and the measured flow rate of hot water measured by the hot water-side flow meter, and when the valve opening of the water-side flow rate adjustment valve is equal to or greater than the valve opening of the hot water side flow rate adjustment valve, calculates and updates the target flow rate of hot water based on the measured flow rate of water, and when the valve opening of the water-side flow rate adjustment valve is smaller than the valve opening of the hot water side flow rate adjustment valve, calculates and updates the target flow rate of water based on the measured flow rate of hot water, and a third control that changes the opening and closing valve speed of the water-side flow rate adjustment valve in accordance with the difference between the calculated target flow rate of water and the measured flow rate of water, and changes the opening and closing valve speed of the hot water side flow rate adjustment valve in accordance with the difference between the calculated target flow rate of hot water and the measured flow rate of hot water. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram showing a hot and cold water mixing device of a first embodiment. [Figure 2]4 is a flowchart showing the water discharge control of the hot and cold water mixing device of the first embodiment. [Figure 3] 10 is a diagram showing each control when the hot and cold water mixing device of the first embodiment discharges water, the valve opening degree of each flow rate control valve, each measured flow rate, and the measured temperature of the mixed hot and cold water. FIG. [Figure 4] 6 is a flowchart showing a second control in the control unit of the first embodiment. [Figure 5] 4 is a flowchart showing water stop control of the hot and cold water mixing device of the first embodiment. [Figure 6] 10 is a diagram showing each control when the hot and cold water mixing device of embodiment 1 stops water supply, the valve opening degree of each flow rate control valve, each measured flow rate, and the measured temperature of mixed hot and cold water. FIG. [Figure 7] 10 is a graph showing the valve closing speeds of the hot water side flow rate adjustment valve and the cold water side flow rate adjustment valve when a fifth control is executed in the control unit of the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] First, embodiments of the present disclosure will be listed and described. Any combination of the following embodiments without causing any contradiction is also included in the embodiments for carrying out the invention. [1] The hot water and water mixing device of the present disclosure includes a mixing water channel, a mixing section to which the upstream end of the mixing water channel is connected, a water supply channel having a downstream end connected to the mixing section and supplying water toward the mixing section, a hot water supply channel having a downstream end connected to the mixing section and supplying hot water toward the mixing section, a water temperature sensor, a water side flow meter, and a water side flow rate adjustment valve provided in the water supply channel, a hot water temperature sensor, a hot water side flow meter, and a hot water side flow rate adjustment valve provided in the hot water supply channel, a setting section to set a set flow rate and a set temperature of the hot water and water mixed water flowing through the mixing water channel, and a control section to control the water side flow rate adjustment valve and the hot water side flow rate adjustment valve, wherein the control section is a first control that changes the flow rate of the hot water and water mixed water in multiple steps between a predetermined flow rate of the hot water and water mixed water and the set flow rate, and sets the flow rate of the hot water and water mixed water for each step to a target flow rate of the hot water and water mixed water, and a second control that changes the flow rate of the hot water and water mixed water for each step to a target flow rate of the hot water and water mixed water, and a third control that changes the flow rate of the hot water and water mixed water in multiple steps to a target flow rate of the hot water and water mixed water for each step. and a second control that calculates a target flow rate of water flowing through the water supply passage and a target flow rate of hot water flowing through the hot water supply passage based on the target flow rate, the set temperature, the measured flow rate of water measured by the water-side flow meter, and the measured flow rate of hot water measured by the hot water-side flow meter, and when the valve opening of the water-side flow rate adjustment valve is equal to or greater than the valve opening of the hot water side flow rate adjustment valve, calculates and updates the target flow rate of hot water based on the measured flow rate of water, and when the valve opening of the water-side flow rate adjustment valve is smaller than the valve opening of the hot water side flow rate adjustment valve, calculates and updates the target flow rate of water based on the measured flow rate of hot water, and a third control that changes the opening and closing valve speed of the water-side flow rate adjustment valve in accordance with the difference between the calculated target flow rate of water and the measured flow rate of water, and changes the opening and closing valve speed of the hot water side flow rate adjustment valve in accordance with the difference between the calculated target flow rate of hot water and the measured flow rate of hot water. This hot and cold water mixing device has excellent temperature stability even when a pressure difference occurs between the cold water supply pressure and the hot water supply pressure, by the control unit executing the first control, the second control, and the third control.

[0009] [2] In the hot and cold water mixing device described in [1] above, in the first control, changing the flow rate in multiple stages and setting the flow rate of the mixed hot and cold water at each stage to the target flow rate of the mixed hot and cold water means increasing or decreasing the target flow rate of the mixed hot and cold water by a predetermined amount every predetermined time. The control unit of this hot and cold water mixing device can easily execute the first control.

[0010] [3] In the hot and cold water mixing device described in either [1] or [2] above, the control unit executes a fourth control that gradually increases the valve opening of the cold water side flow rate adjustment valve and the valve opening of the hot water side flow rate adjustment valve from the time the cold water side flow rate adjustment valve and the hot water side flow rate adjustment valve are simultaneously opened until detection signals from the cold water side flow meter and the hot water side flow meter are input. By executing the fourth control during water discharge control, this hot and cold water mixing device increases the cold water flow rate and the hot water flow rate from the start of water discharge until detection signals from the cold water side flow meter and the hot water side flow meter are input. Therefore, this hot and cold water mixing device can quickly adjust the discharge rate of hot and cold water mixed water to the set flow rate and has excellent responsiveness during water discharge.

[0011] [4] In the hot and cold water mixing device described in [3] above, after the detection signals from the cold water flow meter and the hot water flow meter are input, the control unit sets the predetermined flow rate of the hot and cold water mixed water to the target flow rate of the hot and cold water mixed water and executes the second control and the third control until the predetermined hot and cold water discharge flow rate is reached. The control unit of this hot and cold water mixing device executes the second control and the third control during water discharge control by setting the predetermined flow rate of the hot and cold water mixed water to a target flow rate of the hot and cold water mixed water that is lower than the set flow rate of the hot and cold water mixed water. This allows the hot and cold water mixing device to quickly reach the target water flow rate and transition to a steady state in which the valve opening of the hot and cold water side flow rate adjustment valve is greater than the valve opening of the cold water side flow rate adjustment valve. This allows the hot and cold water mixing device to suppress a sudden increase in the water flow rate. This prevents the hot water mixing device from becoming sluggish due to high water supply pressure and suppresses a decrease in the temperature of the hot and cold water mixed water in the mixing unit. Thus, this hot and cold water mixing device has excellent temperature stability and responsiveness when discharging water.

[0012] [5] In the hot and cold water mixing device described in any one of [1] to [4] above, the control unit calculates the time T until the cold water side flow rate control valve and the hot water side flow rate control valve are closed from the predetermined flow rate of the hot and cold water mixed water based on the valve opening of the cold water side flow rate control valve and the valve closing speed V1 of the hot water side flow rate control valve with the larger valve opening, calculates the valve closing speed V2 for the valve with the smaller valve opening to close over the time T, and executes a fifth control to simultaneously operate the cold water side flow rate control valve and the hot water side flow rate control valve in the valve closing direction at the respective valve closing speeds V1 and V2. The control unit of this hot and cold water mixing device executes the fifth control during water stop control when the predetermined flow rate of the hot and cold water mixed water is reached, which is lower than the flow rate before the water stop operation started. In other words, during water stop control, this hot and cold water mixing device operates the cold water side flow rate control valve and the hot water side flow rate control valve simultaneously in the valve closing direction to close them after the predetermined flow rate of the hot and cold water mixed water is reached, thereby achieving excellent responsiveness when water is stopped. In this hot and cold water mixing device, when the flow rate of the mixed hot and cold water reaches a predetermined flow rate during water stop, the valve opening of the hot water side flow rate adjustment valve is small. Therefore, even when the control unit of this hot and cold water mixing device executes the fifth control during water stop control, it is possible to suppress an increase in the hot water flow rate ratio in the mixing unit and suppress an increase in the temperature of the mixed hot and cold water immediately after water is re-discharged.

[0013] <Embodiment 1> A first embodiment of the hot and cold water mixing device of the present disclosure will be described with reference to the drawings. The hot and cold water mixing device 1 is installed in the ceiling of a bathroom, etc. In this hot and cold water mixing device 1, mixed hot and cold water adjusted to a set temperature and flow rate set by the user flows through a mixing water channel 1M (described later) and is discharged from a water discharge unit installed in the bathroom.

[0014] As shown in Figure 1, the hot water and water mixing device 1 comprises a mixing water channel 1M, a mixing section 2, a water supply channel 1C, and a hot water supply channel 1H. The downstream end of the mixing water channel 1M is connected to the water outlet section. The upstream end of the mixing water channel 1M is connected to the mixing section 2. The upstream end of the water supply channel 1C is connected to a water supply source CW. The upstream end of the hot water supply channel 1H is connected to a hot water supply source HW. The downstream end of the water supply channel 1C and the downstream end of the hot water supply channel 1H are connected to the mixing section 2.

[0015] The hot and cold water mixing device 1 is equipped with a water-side check valve 2C, a water temperature sensor 3C, a water-side flow rate adjustment valve 4C, and a water-side flow meter 5C, which are provided in the water supply passage 1C. The water-side check valve 2C, the water temperature sensor 3C, the water-side flow rate adjustment valve 4C, and the water-side flow meter 5C are arranged in this order from the upstream side to the downstream side of the water supply passage 1C. The hot and cold water mixing device 1 is equipped with a hot water side check valve 2H, a hot water temperature sensor 3H, a hot water side flow rate adjustment valve 4H, and a hot water side flow meter 5H, which are provided in the hot water supply passage 1H. The hot water side check valve 2H, the hot water temperature sensor 3H, the hot water side flow rate adjustment valve 4H, and the hot water side flow meter 5H are arranged in this order from the upstream side to the downstream side of the hot water supply passage 1H.

[0016] Each check valve 2C, 2H allows flow from the upstream side to the downstream side and prevents flow in the reverse direction. The water temperature sensor 3C and the hot water temperature sensor 3H are temperature sensors that use thermistors. The water temperature sensor 3C measures the temperature of the water flowing through the water supply passage 1C. In the following explanation, the temperature of the water measured by the water temperature sensor 3C is referred to as the "measured water temperature T C The hot water temperature sensor 3H measures the temperature of the hot water flowing through the hot water supply passage 1H. In the following description, the hot water temperature measured by the hot water temperature sensor 3H is referred to as the "measured hot water temperature T H The water temperature sensor 3C measures the water temperature T C The hot water temperature sensor 3H transmits data relating to the hot water temperature T H The data relating to the above is transmitted to the control unit 20.

[0017] Each flow rate control valve 4C, 4H has a valve element (not shown) that opens and closes each flow path 1C, 1H. Each valve element is rotated by a stepping motor (not shown) to close the water supply path 1C and the hot water supply path 1H or open them at a desired valve opening. In other words, each flow rate control valve 4C, 4H has a water stop function and a flow rate control function. The rotation angle and rotation speed of each stepping motor are controlled in proportion to the number and speed of pulse signals sent from the control unit 20. In other words, the control unit 20 can control the valve opening and valve speed of each flow rate control valve 4C, 4H. The control unit 20 calculates and stores the valve opening of the valve element of each flow rate control valve 4C, 4H from the rotation angle of each stepping motor.

[0018] Each of the flow meters 5C and 5H is an impeller type flow meter. The water-side flow meter 5C measures the flow rate of water flowing through the water supply passage 1C. In the following description, the flow rate of water flowing through the water supply passage 1C measured by the water-side flow meter 5C is referred to as the "measured water flow rate Q C The hot water side flow meter 5H measures the flow rate of the hot water flowing through the hot water supply path 1H. In the following description, the flow rate of the hot water flowing through the hot water supply path 1H measured by the hot water side flow meter 5H is referred to as the "measured hot water flow rate Q H Each of the flow meters 5C and 5H has a non-operating range in which the flow rate of the water flowing through the water supply passage 1C and the flow rate of the hot water flowing through the hot water supply passage 1H are small. Each of the flow meters 5C and 5H measures the water flow rate Q C Data on the measured flow rate of hot water Q H The data relating to the above is transmitted to the control unit 20.

[0019] The hot and cold water mixing device 1 comprises a setting unit 10 and a control unit 20. The setting unit 10 is provided in a remote controller (not shown) of the hot and cold water mixing device 1 installed in the bathroom. The remote controller has an operation button for operating the discharge and stopping of mixed hot and cold water from the water discharge unit, and a setting button for setting the flow rate and temperature of the mixed hot and cold water discharged from the water discharge unit. Each time the operation button is pressed by the user, the remote controller repeatedly sends a water discharge start command and a water stop start command to the control unit 20. The hot and cold water mixing device 1 allows the user to set the flow rate and temperature desired by the user using the setting button on the remote controller. The set flow rate and temperature will be referred to as the "set flow rate Q of mixed hot and cold water" in the following explanation. S " and "Hot water mixed water setting temperature T S The remote controller controls the set flow rate of hot and cold water mixture Q S and set temperature T S The setting unit 10 has a display unit that displays the set flow rate Q of the hot and cold water mixture. S Data on the hot and cold water mix temperature T S The data relating to the above is transmitted to the control unit 20.

[0020] The control unit 20 executes the following water discharge control and water stop control based on the following data, and drives the stepping motors of the flow rate control valves 4C and 4H. The following explanation of the water discharge control and water stop control is given in the case where the difference between the water supply pressure and the hot water supply pressure is large and the set flow rate T S This assumes conditions where there are many

[0021] <Each data> 1. The “set flow rate Q of hot and cold water mixture” transmitted from the setting unit 10 to the control unit 20 S Data on 2. The “hot water / cold water mixed temperature setting T S Data on 3. The measured water temperature T C Data on 4. The measured water temperature T H Data on 5. The measured water flow rate Q transmitted from the water flow meter 5C to the control unit 20 C Data on 6. The measured flow rate Q of hot water transmitted from the hot water side flow meter 5H to the control unit 20 H Data on 7. Valve opening VP of water side flow control valve 4C C Data on 8. Valve opening VP of hot water side flow control valve 4H H Data on

[0022] <Water discharge control> As shown in Fig. 2, when a user presses an operation button on the remote controller while mixed water is not being discharged from the water discharger, the control unit 20 receives a water discharge start command from the remote controller (step S1). Then, the control unit 20 sets a predetermined flow rate of mixed water (step S2). The predetermined flow rate is, for example, a set flow rate Q of mixed water. Sis set to 10 L / min, the predetermined flow rate is set to 5 L / min. Next, the control unit 20 determines whether each of the flow meters 5C, 5H is not operating (step S3). If the control unit 20 receives data on the measured flow rate from each of the flow meters 5C, 5H, the control unit 20 determines that each of the flow meters 5C, 5H is operating. If the control unit 20 does not receive data on the measured flow rate from at least one of the flow meters 5C, 5H, the control unit 20 determines that each of the flow meters 5C, 5H is not operating.

[0023] The control unit 20 executes the fourth control while the flow meters 5C and 5H are not operating (step S4). While the flow meters 5C and 5H are not operating, the measured flow rates of the cold water and the hot water are 0 (zero) L / min, as shown in FIG.

[0024] <Fourth Control> When the control unit 20 executes the fourth control, it gradually increases the valve opening degree by maintaining the same valve opening speed for each of the flow rate control valves 4C, 4H. That is, the control unit 20 sends pulse signals to each stepping motor that rotates the valve element of each of the flow rate control valves 4C, 4H so that the rotation speeds of the stepping motors are the same. When the control unit 20 executes the fourth control, the valve opening degree of the cold water side flow rate control valve 4C and the valve opening degree of the hot water side flow rate control valve 4H of the hot water mixing device 1 increase at the same valve opening speed, as shown in FIG. 3. Therefore, while the flow meters 5C, 5H are not operating, the valve opening degree of the cold water side flow rate control valve 4C and the valve opening degree of the hot water side flow rate control valve 4H are always the same.

[0025] As shown in Fig. 2, the control unit 20 executes the second control and the third control (step S5) aiming at the predetermined flow rate (5 L / min) of the mixed water from when the flow meters 5C and 5H start operating until the measured flow rate of the mixed water reaches the predetermined flow rate (5 L / min) (step S6). The measured flow rate of the mixed water is the sum of the flow rate values ​​measured by the flow meters 5C and 5H.

[0026] When the control unit 20 executes the second control, as will be described below, the set temperature T S , set flow rate Q of hot and cold water mixture S, the measured temperature of the water T C , the measured temperature of the hot water T H , the measured flow rate of water Q C , the measured flow rate of hot water Q H , valve opening VP of water side flow control valve 4C C , and the valve opening VP of the hot water side flow control valve 4H H Target flow rate Q of water flowing from the water supply channel 1C C1 And the target flow rate Q of hot water flowing through hot water supply path 1H H1 Determine.

[0027] <Second control> As shown in FIG. 4, the control unit 20 sets the set temperature T S The measured temperature of the hot water is T H The control unit 20 determines whether the set temperature T S The measured temperature of the water is T H If it is determined that the water flow rate is higher than C1 is set to 0 (zero) (step S202), and the target flow rate Q H1 Set the flow rate Q S (step S203).

[0028] In step S201, the control unit 20 sets the set temperature T S The measured temperature of the water is T H and the set temperature T S The measured temperature of the water is T H If it is determined that the temperature is lower than the set temperature T S is the measured temperature of the water, T C The control unit 20 determines whether the set temperature T S is the measured temperature of the water, T C If it is determined that the water flow rate is lower than the target flow rate Q C1 Set the flow rate Q S (Step S205), and the target flow rate Q H1 is set to zero (step S206).

[0029] In step S204, the control unit 20 sets the set temperature T S is the measured temperature of the water, T Cand the set temperature T S is the measured temperature of the water, T C If it is determined that the water flow rate is higher than C1 is calculated using the following formula 1 (step S207), and the target flow rate Q H1 is calculated by the following formula 2 (step S208). Q C1 =(T H -T S )×Q S / (T H -T C ) … Formula 1 Q H1 =Q S -Q C1 … Formula 2

[0030] Next, the control unit 20 calculates the measured temperature T H is higher than a predetermined threshold value (step S209). The predetermined threshold value is, for example, a temperature that the user feels is a comfortable temperature for the hot and cold water mixture to be used. H is determined to be lower than the threshold, the target water flow rate Q C1 is set to the value calculated in step S207, and the target flow rate Q H1 is set to the value calculated in step S208.

[0031] In step S209, the control unit 20 determines the measured temperature T H is determined to be equal to or higher than the threshold value, the valve opening degree VP of the water-side flow control valve 4C is C However, the valve opening VP of the hot water side flow control valve 4H H The control unit 20 determines whether the valve opening degree VP of the water-side flow rate control valve 4C is greater than or equal to VP (step S210). C Valve opening VP of hot water side flow control valve 4H H and the valve opening VP of the water side flow control valve 4C C Valve opening VP of hot water side flow control valve 4H H If it is determined that the target flow rate of hot water Q H1 The measured flow rate of water Q CIn this case, the control unit 20 recalculates and updates the target flow rate Q of water using the following formula 3 based on the above formula (step S211). C1 is set to the value calculated in step S207. In the water discharge control, the valve opening VP of the water-side flow control valve 4C is set to the value calculated in step S208 from the time when the flow meters 5C and 5H start operating until the measured flow rate of the hot and cold water mixture reaches the predetermined flow rate (3 L / min). C is the valve opening VP of the hot water side flow control valve 4H. H (See Figure 3). Q H1 =(T S -T C )×Q C / (T H -T S ) … Formula 3

[0032] <Third Control> The control unit 20 controls the target flow rate Q of the water flowing through the water supply passage 1C by the second control. C1 And the target flow rate Q of hot water flowing through hot water supply path 1H H1 After determining each of the target flow rates Q, the control unit 20 executes the third control. C1 ,Q H1 and each measured flow rate Q C ,Q H Depending on the absolute value of the difference between these values, the amount of correction to the valve opening of each flow rate control valve and the time interval for correcting the valve opening are determined to be one of four levels, as shown in Table 1. The control unit 20 transmits data relating to the determined amount of correction to the valve opening of each flow rate control valve 4C, 4H and the time interval for correcting the valve opening to each flow rate control valve 4C, 4H, and drives each flow rate control valve 4C, 4H.

[0033] [Table 1]

[0034] The control unit 20 determines each target flow rate Q C1 ,Q H1 and each measured flow rate Q C ,Q HThe absolute value of the difference between the target flow rate Q and the actual flow rate Q (for example, "A1 or more," "A2 or more and less than A1," etc.), the amount of correction to the valve opening (for example, "10," "5," "0"), and the time interval for correcting the valve opening (for example, "first time Tth1," "second time Tth2") are associated with each other. C1 ,Q H1 and each measured flow rate Q C ,Q H The control unit 20 determines the amount of correction of the valve opening and the time interval for correcting the valve opening to one of four levels depending on the absolute value of the difference between each target flow rate Q C1 ,Q H1 and each measured flow rate Q C ,Q H If the absolute value of the difference between the target flow rate Q and the target flow rate Q is equal to or greater than A1, the amount of correction of the valve opening is determined to be 10 steps, and the time interval for correcting the valve opening is determined to be the first time Tth1. Here, "xx steps" refers to the number of steps of the stepping motor. The control unit 20 calculates the target flow rate Q for each target flow rate Q. C1 ,Q H1 and each measured flow rate Q C ,Q H If the absolute value of the difference between the target flow rate Q and the target flow rate Q is equal to or greater than A2 and less than A1, the amount of correction of the valve opening is determined to be five steps, and the time interval for correcting the valve opening is determined to be the first time Tth1. C1 ,Q H1 and each measured flow rate Q C ,Q H If the absolute value of the difference between the target flow rate Q and the target flow rate Q is equal to or greater than A3 and less than A2, the amount of correction of the valve opening is determined to be five steps, and the time interval for correcting the valve opening is determined to be the first time Tth2. The second time Tth2 is longer than the first time Tth1. C1 ,Q H1 and each measured flow rate Q C ,Q HIf the absolute value of the difference between the target flow rate and the measured flow rate is less than A3, the control unit 20 determines that the valve opening is to be corrected by 0 (zero) steps, i.e., no rotation, and determines the time interval for correcting the valve opening to be the second time Tth2. Alternatively, the control unit 20 may combine the valve opening and the time interval for changing the valve opening in two stages, or in five or more stages, as long as it is multi-stage. By executing the third control, the control unit 20 quickly reduces the difference between the target flow rate and the measured flow rate, and by operating the stepping motors of the flow rate control valves 4C and 4H at a speed other than their maximum speed, the control unit 20 can quickly end the transitional period in which the valve opening of the cold water side flow rate control valve 4C and the valve opening of the hot water side flow rate control valve 4H are the same.

[0035] The control unit 20 executes the second control and the third control aiming at the predetermined flow rate (5 L / min) of the hot and cold water mixed water from the time when the flow meters 5C and 5H start to operate until the measured flow rate of the hot and cold water mixed water reaches the predetermined flow rate (5 L / min). Therefore, as shown in FIG. 3, the measured flow rate Q C Therefore, this hot and cold water mixing device 1 can prevent the hot water from becoming sluggish due to high water supply pressure when discharging water, and can suppress a drop in the temperature of the mixed hot and cold water when discharging water.

[0036] <First control> As shown in Fig. 2, when the measured flow rate of the hot and cold water mixed water reaches a predetermined flow rate (5 L / min), the control unit 20 executes the second control and the third control while executing the first control. Specifically, the control unit 20 increases the target flow rate of the hot and cold water mixed water when executing the second control by a predetermined amount relative to the predetermined flow rate (step S7). The predetermined amount is, for example, 500 mL / min. Next, a predetermined time is set (step S8). The predetermined time is, for example, 500 msec. The control unit 20 executes the second control and the third control while increasing the target flow rate of the hot and cold water mixed water by 500 mL / min every 500 msec (steps S7 to S10).

[0037] The control unit 20 increases the target flow rate by a predetermined amount (step S7), sets a predetermined time (step S8), and then executes the second control and the third control (step S9). The second control and the third control are similar to those described above, but as shown in FIG. 3, after the measured flow rate of the hot and cold water mixed water reaches a predetermined flow rate, the valve opening VP of the water-side flow rate control valve 4C is increased. C Valve opening VP of hot water side flow control valve 4H H Therefore, the determination in step S210 of the flowchart of the second control shown in FIG. 4 is No, and the control unit 20 sets the target flow rate Q of water to C1 The measured flow rate of hot water Q H In this case, the control unit 20 recalculates and updates the target flow rate Q of hot water using the following formula 4 based on the above formula (step S213). H1 is set to the value calculated in step 208. Q C1 =(T H -T S )×Q H / (T S -T C ) … Equation 4

[0038] As shown in FIG. 2, the control unit 20 determines whether a predetermined time has elapsed (step S10). If the predetermined time has elapsed, the control unit 20 determines whether the target flow rate of the hot and cold water mixture has reached the set flow rate Q S It is determined whether the target flow rate of the hot and cold water mixture reaches the set flow rate Q (step S11). S If the target flow rate of the hot and cold water mixture does not reach the set flow rate Q, the control unit 20 returns to step S7 and repeats the control from step S7 to S11. S If the flow rate reaches the set flow rate Q, the flow does not return to step S7, and the flow rate remains the same until a water stop command or other command is received from the remote controller. S and set temperature T S In response to this, the stepping motors, that is, the flow rate adjustment valves 4C and 4H are driven and controlled.

[0039] As explained above, when the control unit 20 executes the water discharge control, as shown in Fig. 3, it executes the fourth control until the flow meters 5C, 5H start operating, and then executes the second control and the third control aiming at the predetermined flow rate of the mixed water from the time the flow meters 5C, 5H start operating until the measured flow rate of the mixed water reaches the predetermined flow rate. This allows the hot and cold water mixing device 1 to quickly reach the target flow rate and shorten the transition period in which the valve opening of the hot water side flow rate adjustment valve 4H and the valve opening of the cold water side flow rate adjustment valve 4C are the same. Therefore, the hot and cold water mixing device 1 can suppress a sudden increase in the water flow rate, avoiding the hot water from flowing smoothly due to high water supply pressure in the mixing unit 2, and improve responsiveness. When the predetermined flow rate of the mixed water is reached during the water discharge control, the control unit 20 executes the set flow rate Q of the mixed water. S In order to achieve this, the second control and the third control are executed while the first control is executed. As a result, the hot and cold water mixing device 1 can stably supply mixed hot and cold water at the set temperature. In this way, the hot and cold water mixing device 1 is able to stably supply mixed hot and cold water at the set temperature. S Even if the temperature is high, it suppresses the temperature drop of the hot and cold water mixture when it is discharged, and has excellent temperature stability and responsiveness.

[0040] <Water stop control> As shown in Fig. 5, when a user presses an operation button on the remote controller while mixed hot and cold water is being discharged from the discharge unit, the control unit 20 receives a water stop start command from the remote controller (step S21). Then, the control unit 20 sets a predetermined flow rate of mixed hot and cold water (step S22). For example, if the measured flow rate of mixed hot and cold water in the water discharge state is about 10 L / min, the predetermined flow rate is set to 5 L / min. Next, the control unit 20 sets the target flow rate of mixed hot and cold water to the current measured flow rate of mixed hot and cold water (step S23).

[0041] The control unit 20 executes the second control and the third control while executing the first control from the time when the water stop start command is received until the measured flow rate of the hot and cold water mixed water reaches a predetermined flow rate (5 L / min) (step S24). More specifically, the target flow rate of the hot and cold water mixed water when executing the second control is reduced by a predetermined amount (step S25). The predetermined amount is, for example, 500 mL / min. Next, a predetermined time is set (step S26). The predetermined time is, for example, 500 msec. The second control and the third control are similar to those described above (see Table 1). The control unit 20 executes the second control and the third control while reducing the target flow rate of the hot and cold water mixed water by 500 mL / min every 500 msec (steps S24 to S27).

[0042] The control device determines whether a predetermined time has elapsed (step S27), and if so, determines whether the target flow rate of the hot and cold water mixed water has reached a predetermined flow rate (5 L / min) (step S28). If the target flow rate of the hot and cold water mixed water has not reached the predetermined flow rate, the control unit 20 returns to step S24 and repeats the control from steps S24 to S28. In the hot and cold water mixing device 1, when the control unit 20 executes the first control until the measured flow rate of the hot and cold water mixed water reaches the predetermined flow rate, and then executes the second control and the third control, as shown in FIG. 6, the measured flow rate Q of the hot water mixed water decreases until the valve opening of the hot water side flow rate adjustment valve 4H decreases. C Therefore, the hot and cold water mixing device 1 can suppress an increase in the hot water flow rate ratio in the mixing section 2 during water stop control, and can suppress a rise in the temperature of the mixed hot and cold water immediately after water is discharged again.

[0043] When the target flow rate of the hot and cold water mixed water reaches a predetermined flow rate, the control unit 20 sets the target flow rate of the hot and cold water mixed water to 0 (zero) (step S29) and executes the fifth control (S30). The hot and cold water mixing device 1 improves responsiveness when water is stopped by having the control unit 20 execute the fifth control. When the target flow rate of the hot and cold water mixed water reaches the set flow rate, as shown in Figure 6, the valve opening of the hot water side flow rate adjustment valve 4H is small, and the decrease in the measured water flow rate is slight. Therefore, even when the control unit 20 executes the fifth control during water stop control, the hot and cold water mixing device 1 can suppress an increase in the hot water flow rate ratio in the mixing unit 2 and suppress a rise in the temperature of the hot and cold water mixed water immediately after water is re-discharged.

[0044] <5th Control> When the target flow rate of the hot and cold water mixed water reaches the set flow rate, the valve opening of the hot water side flow control valve 4H is greater than the valve opening of the cold water side flow control valve 4C, as shown in Figure 6. When the control unit 20 executes the fifth control, as shown in Figure 7, it calculates the time T required to close the hot water side flow control valve 4H at a valve closing speed V1 based on the valve opening of the hot water side flow control valve 4H at the time when the target flow rate of the hot and cold water mixed water reaches the specified flow rate. The control unit 20 calculates the valve closing speed V2 of the cold water side flow control valve 4C, which is smaller than the valve opening of the hot water side flow control valve 4H, so that the cold water side flow control valve 4C closes in the same time T, based on the valve opening of the cold water side flow control valve 4C at the time when the target flow rate of the hot and cold water mixed water reaches the specified flow rate. The control unit 20 simultaneously operates the hot water side flow control valve 4H at the valve closing speed V1 and the cold water side flow control valve 4C at the valve closing speed V2 in the valve closing direction. When the control unit 20 executes the fifth control, the hot water side flow control valve 4H and the cold water side flow control valve 4C operate in the closing direction while maintaining the same ratio of valve opening degrees, and finally close simultaneously, ending the water stop control.

[0045] As described above, when the control unit 20 executes the water stop control, it executes the second control and the third control while executing the first control until the measured flow rate of the hot and cold water mixed water reaches a predetermined flow rate, as shown in FIG. 6. This prevents the measured water flow rate from decreasing until the valve opening of the hot water side flow rate adjustment valve 4H is reduced. Therefore, the hot and cold water mixing device 1 can suppress an increase in the hot water flow rate ratio in the mixing unit 2 during water stop control and suppress a rise in the temperature of the hot and cold water mixed water immediately after re-discharge. When the hot and cold water mixed water reaches a predetermined flow rate, the control unit 20 sets the target flow rate of the hot and cold water mixed water to 0 (zero) and executes the fifth control. Therefore, the hot and cold water mixing device 1 has excellent water stop response and can suppress an increase in the hot water flow rate ratio in the mixing unit 2 and suppress a rise in the temperature of the hot and cold water mixed water when re-discharged.

[0046] <Effects of the First Embodiment> The hot water and water mixing device 1 of the first embodiment includes a mixing water channel 1M, a mixing section 2 connected to the upstream end of the mixing water channel 1M, a water supply channel 1C connected to the mixing section 2 at its downstream end and supplying water toward the mixing section 2, a hot water supply channel 1H connected to the mixing section 2 at its downstream end and supplying hot water toward the mixing section 2, a water temperature sensor 3C, a water side flow meter 5C, and a water side flow rate control valve 4C provided in the water supply channel 1C, a hot water temperature sensor 3H, a hot water side flow meter 5H, and a hot water side flow rate control valve 4H provided in the hot water supply channel 1H, and a set flow rate Q of the hot water and water mixture discharged from the water discharge section. S and set temperature T S and a control unit 20 that controls the cold water side flow rate adjustment valve 4C and the hot water side flow rate adjustment valve 4H. The control unit 20 controls the predetermined flow rate of the hot and cold water mixed water and the set flow rate Q S Between the first control, the flow rate is changed in multiple stages, and the flow rate of the hot and cold water mixed water when divided into each stage is set to the target flow rate of the hot and cold water mixed water, and the target flow rate and set temperature Q T , the measured water flow rate Q measured by the water side flow meter 5C C , and the measured flow rate Q of hot water measured by the hot water side flow meter 5H H Based on this, the target flow rate of water flowing through the water supply passage 1C and the target flow rate of hot water flowing through the hot water supply passage 1H are calculated, and when the valve opening of the water side flow control valve 4C is equal to or greater than the valve opening of the hot water side flow control valve 4H, the measured water flow rate Q CWhen the valve opening of the water side flow control valve 4C is smaller than the valve opening of the hot water side flow control valve 4H, the measured hot water flow rate Q H The second control calculates and updates the target water flow rate based on the calculated target water flow rate and the measured water flow rate Q C The opening and closing valve speed of the hot water side flow control valve 4H is changed according to the difference between the calculated target hot water flow rate and the measured hot water flow rate Q H and a third control that changes the temperature in accordance with the difference between the water supply pressure and the hot water supply pressure. This hot water mixing device 1 has excellent temperature stability even when a pressure difference occurs between the water supply pressure and the hot water supply pressure, as the control unit 20 executes the first control, second control, and third control.

[0047] In the first control, the hot and cold water mixing device 1 of the first embodiment increases or decreases the target flow rate of the hot and cold water mixture by a predetermined amount at every predetermined time. The control unit 20 of this hot and cold water mixing device 1 can easily execute the first control.

[0048] In the hot and cold water mixing device 1 of embodiment 1, the control unit 20 executes a fourth control that gradually increases the valve opening of the cold water side flow rate control valve 4C and the valve opening of the hot water side flow rate control valve 4H from the time the cold water side flow rate control valve 4C and the hot water side flow rate control valve 4H are simultaneously opened until detection signals from the cold water side flow meter 5C and the hot water side flow meter 5H are input. By executing the fourth control during water discharge control, this hot and cold water mixing device 1 increases the cold water flow rate and the hot water flow rate from the start of water discharge until detection signals from the cold water side flow meter 5C and the hot water side flow meter 5H are input. Therefore, this hot and cold water mixing device 1 can quickly adjust the discharge rate of hot and cold water mixed water to the set flow rate and has excellent responsiveness during water discharge.

[0049] In the hot and cold water mixing device 1 of the first embodiment, after the detection signals of the cold water side flow meter 5C and the hot water side flow meter 5H are input, the control unit 20 sets the predetermined flow rate of the hot and cold water mixed water as the target flow rate of the hot and cold water mixed water and executes the second control and the third control until the predetermined discharge flow rate of the hot and cold water is reached. SThe second control and the third control are executed by setting a predetermined flow rate of hot and cold water mixed water that is less than the target flow rate of hot and cold water mixed water. As a result, this hot and cold water mixing device 1 quickly reaches the target water flow rate and can quickly transition to a steady period in which the valve opening of the hot water side flow rate adjustment valve 4H is greater than the valve opening of the cold water side flow rate adjustment valve 4C. As a result, this hot and cold water mixing device 1 can suppress a sudden increase in the water flow rate. As a result, this hot and cold water mixing device 1 can avoid a situation in which the hot water becomes difficult to flow due to high water supply pressure, and can suppress a drop in the temperature of the hot and cold water mixed water in the mixing section 2. In this way, this hot and cold water mixing device 1 has excellent temperature stability and responsiveness when discharging water.

[0050] In the hot and cold water mixing apparatus 1 of the first embodiment, the control unit 20 calculates the time T until the cold water side flow control valve 4C and the hot water side flow control valve 4H are closed from a predetermined flow rate of the hot and cold water mixed water based on the valve closing speed V1 of the cold water side flow control valve 4C or the hot water side flow control valve 4H, whichever has the larger valve opening, and calculates the valve closing speed V2 for the valve with the smaller valve opening to close over the time T. This executes a fifth control to simultaneously operate the cold water side flow control valve 4C and the hot water side flow control valve 4H in the closing direction at the respective valve closing speeds V1 and V2. The control unit 20 of this hot and cold water mixing apparatus 1 executes the fifth control during water stop control when a predetermined flow rate of the hot and cold water mixed water is reached, which is lower than the flow rate before the water stop operation began. In other words, during water stop control, this hot and cold water mixing apparatus 1 simultaneously operates the cold water side flow control valve 4C and the hot water side flow control valve 4H in the closing direction to close them after the predetermined flow rate of the hot and cold water mixed water is reached, resulting in excellent responsiveness when water is stopped. In this hot water / cold water mixing device 1, when the flow rate of the hot water / cold water mixture reaches a predetermined flow rate while the water supply is stopped, the valve opening of the hot water side flow rate adjustment valve 4H is small. Therefore, even when the control unit 20 of this hot water / cold water mixing device 1 executes the fifth control during water supply stop control, it is possible to suppress an increase in the hot water flow rate ratio in the mixing unit 2 and suppress an increase in the temperature of the hot water / cold water mixture when water is discharged again.

[0051] <Other embodiments> The present disclosure is not limited to the first embodiment described above with reference to the drawings, and the following embodiments are also included within the technical scope of the present disclosure. (1) The hot water / cold water mixing device may have a flow meter in the mixing water channel to measure the flow rate of the hot water / cold water mixture, and may measure the flow rate of the mixed water. (2) The predetermined flow rate of the hot and cold water mixture in the water discharge control can be appropriately set by the set flow rate of the hot and cold water mixing device. (3) The predetermined flow rate of the hot and cold water mixture in the water stop control can be set appropriately based on the measured flow rate of the hot and cold water mixture in the water discharge state. (4) The threshold value of the measured temperature of the hot water in the second control can be set as appropriate. (5) The moving speed of the stepping motor, which is the opening / closing valve speed of the flow rate adjustment valve according to the difference between the target flow rate and the measured flow rate in the third control, is not limited to the speed described in the first embodiment and can be set appropriately. (6) In the first control of the water discharge control, when setting the target flow rate of the hot and cold water mixture in stages, the target flow rate was increased by 500 mL / min (predetermined amount) every 500 msec (predetermined time), but the predetermined time and predetermined amount can be changed as appropriate. (7) In the first control of the water stop control, when setting the target flow rate of the hot and cold water mixture in stages, the target flow rate was reduced by 500 mL / min (predetermined amount) every 500 msec (predetermined time), but the predetermined time and predetermined amount can be changed as appropriate. [Explanation of symbols]

[0052] 1... Hot water mixing device, 1C... Water supply channel, 1H... Hot water supply channel, 1M... Mixing channel, 2... Mixing section, 3C... Water temperature sensor, 3H... Hot water temperature sensor, 4C... Water side flow rate control valve, 4H... Hot water side flow rate control valve, 5C... Water side flow meter, 5H... Hot water side flow meter, 10... Setting section, 20... Control section

Claims

1. A mixed waterway, a mixing section to which the upstream end of the mixing channel is connected; a water supply channel having a downstream end connected to the mixing section and supplying water toward the mixing section; a hot water supply passage having a downstream end connected to the mixing section and supplying hot water toward the mixing section; a water temperature sensor, a water-side flow meter, and a water-side flow rate control valve provided in the water supply passage; a hot water temperature sensor, a hot water side flow meter, and a hot water side flow rate control valve provided in the hot water supply path; A setting unit that sets a set flow rate and a set temperature of the hot and cold water mixed water flowing through the mixing water channel; a control unit that controls the cold water side flow rate adjustment valve and the hot water side flow rate adjustment valve; It is equipped with The control unit A first control that changes the flow rate in multiple steps between a predetermined flow rate of the hot and cold water mixed water and the set flow rate, and sets the flow rate of the hot and cold water mixed water at each step as a target flow rate of the hot and cold water mixed water; For each stage, a target flow rate of water flowing through the water supply passage and a target flow rate of hot water flowing through the hot water supply passage are calculated based on the target flow rate, the set temperature, the measured flow rate of water measured by the water-side flow meter, and the measured flow rate of hot water measured by the hot water-side flow meter; a second control that calculates and updates a target flow rate of hot water based on the measured flow rate of water when the valve opening degree of the water side flow rate control valve is equal to or greater than the valve opening degree of the hot water side flow rate control valve, and calculates and updates the target flow rate of water based on the measured flow rate of hot water when the valve opening degree of the water side flow rate control valve is smaller than the valve opening degree of the hot water side flow rate control valve; a third control that changes the opening / closing valve speed of the water-side flow rate control valve in accordance with the difference between the calculated target flow rate of the water and the measured flow rate of the water, and changes the opening / closing valve speed of the hot water-side flow rate control valve in accordance with the difference between the calculated target flow rate of the hot water and the measured flow rate of the hot water; A hot and cold water mixing device that performs the above.

2. The hot water and water mixing device described in claim 1, wherein in the first control, the flow rate is changed in multiple stages, and the flow rate of the hot water and water mixed water when divided into each stage is set to the target flow rate of the hot water and water mixed water, which means increasing or decreasing the target flow rate of the hot water and water mixed water by a predetermined amount every predetermined time.

3. The control unit During the period from when the cold water side flow rate control valve and the hot water side flow rate control valve are simultaneously opened until the detection signals of the cold water side flow meter and the hot water side flow meter are input, The hot and cold water mixing device according to claim 1 or 2, wherein a fourth control is executed to gradually increase the valve opening degree of the cold water side flow rate adjustment valve and the valve opening degree of the hot water side flow rate adjustment valve.

4. The control unit The hot and cold water mixing device of claim 3, wherein after the detection signals of the water side flow meter and the hot water side flow meter are input, the predetermined flow rate of the hot and cold water mixed water is set to the target flow rate of the hot and cold water mixed water, and the second control and the third control are executed until the predetermined flow rate of the hot and cold water mixed water is reached.

5. The control unit From the predetermined flow rate of the hot and cold water mixed water until the cold water side flow rate control valve and the hot water side flow rate control valve are closed, A hot and cold water mixing device as described in any one of claims 1 and 2, wherein a fifth control is executed in which the time T until the valves close is calculated based on the valve opening of the water side flow control valve and the closing speed V1 of the hot water side flow control valve with the larger valve opening, a closing speed V2 for the valve with the smaller valve opening to close over the time T is calculated, and the water side flow control valve and the hot water side flow control valve are operated in the closing direction simultaneously at the respective closing speeds V1 and V2.

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