JPH0367312A - Hot/cool water mixing device - Google Patents

Abstract

PURPOSE:To quickly obtain a desired temperature of the hot water mixed with the cool water by securing such a constitution where a controller closes a control valve when a stop mode is instructed by a setter during supply of the hot water with a mixing valve kept at its position for a prescribed time and the controller drives the mixing valve to the full-open position of water after the prescribed time. CONSTITUTION:When a stop mode is instructed by a setter 29 during supply of the hot water, the supply of the hot water is topped by a control valve 23 with the value of the current applied to a solenoid 26 kept for a prescribed time. The energization of the solenoid 26 is released when the prescribed time passes, and the valve 23 is automatically set back to the full-open position of water. When the supply the hot water is instructed by the setter 29, the valve 23 is opened. At the same time, the current value of the solenoid 26 is kept for a prescribed time. Hereafter the signal of a temperature detector 22 is fetched for start of the feedback control. Then the position of a cylinder 18 serving as a mixing valve 21 maintained in order to prevent the large overshoot which is caused at the second supply of the hot water. As a result, a stable temperature is secured at the second supply of the hot water and a user can use the hot water mixed with the cool water.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water mixing device that adjusts the mixing ratio of hot water and water to obtain an optimal mixed water temperature.

2. Description of the Related Art Conventionally, there has been a hot water mixing device of this type as shown in FIG. In FIG. 2, there are a hot water flow path 1, a water flow path 2, an automatic pressure regulating valve 3 that equalizes the pressure in the two flow channels, and a mixing valve 4 downstream of the automatic pressure regulating valve 3, and a mixing valve driving device W5.
A motor 6 , a coupling mechanism 8 that transmits the rotational movement of the motor 6 to the valve shaft 7 of the mixing valve 4 , a screw mechanism 9 that converts the rotation of the valve shaft 7 into a thrust, and a screw mechanism 9 downstream of the mixing valve 4 . It consists of a temperature detector 10 provided, a control valve 11 for controlling the stoppage of the mixed water, a setting device 12 for instructing the desired temperature and stoppage of the hot water supply, and a controller 13 for controlling the motor 6.

Problems to be Solved by the Invention The controller 13 compares the temperature set by the setting device 12 and the temperature detected by the temperature detector 10, and changes the rotation speed of the motor 6 as the mixing valve driving device 5 according to the amount of deviation. The mixing valve 4 is controlled to obtain mixed water at a desired temperature, and when the valve is stopped, the temperature of the entire valve body rises due to heat transfer from the hot water side or internal convection. If you instruct hot water in this state, the controller 13
starts temperature control, detects the high temperature that has accumulated near the temperature detector 10, and controls the motor 6 in a direction to lower the temperature.

As soon as the mixing valve is controlled, the water, which is originally at a low temperature, flows into the water flow path 2, causing a large undershoot and causing discomfort to the user.

The present invention is intended to solve such conventional problems, and an object of the present invention is to provide a safe and easy-to-use hot water mixing device that provides a stable temperature at the start of hot water dispensing.

Means for Solving the Problems In order to solve the above problems, the hot water mixing device of the present invention includes a hot water flow path, a water flow path, and a mixing valve that changes the flow rate ratio of hot water in the hot water flow path and water in the water flow path. a drive device that electrically drives the mixing valve; a temperature detector that detects the temperature of the mixed water provided downstream of the mixing valve; and a control valve that electrically controls the stopping of the mixed water. It consists of a setting device that instructs to set a desired temperature and stop hot water output, and a controller that controls the mixing valve via the drive device based on the signal from the setting device and the signal from the temperature sensor, and the controller is configured to , When a stop is instructed by the setting device during hot water dispensing, the valve position of the mixing valve is held for a predetermined period of time, and when that time is exceeded, the mixing valve is automatically driven to the water side fully open, and within a predetermined period of time. When the setting device instructs hot water to be dispensed, the mixing valve is held for a predetermined period of time and then temperature control is started.

Effect With the above configuration, when the setting device is used to instruct the stop during hot water dispensing, the valve position of the mixing valve is held for a predetermined period of time, and when the setting device is used to instruct the dispensing of hot water, the mixing valve is held for the specified period of time, and then the set temperature and temperature are set. Temperature control is started so that the temperatures detected by the detector are equal, and the temperature does not become unstable at the start of hot water supply, providing a stable water temperature.

EXAMPLES Hereinafter, examples of the present invention will be described based on the accompanying drawings. FIG. 1 is a sectional view of a hot water mixing device in an embodiment of the present invention. In FIG. 1, there is a valve housing 17 having a hot water flow path 14, a water flow path 15, and one outflow path 16, and a cylinder 18 that slides inside the valve housing 17 has a cylinder 18 on its outer periphery that adjusts the flow rate on the hot water side. The hot water side adjustment hole 19 and the water side that adjusts the flow rate of the water side! 1I node hole 2o is provided, and the cylinder 1
8 constitutes a mixing valve 21 that changes the flow rate ratio of hot water and water by sliding. A temperature detector 22 is provided downstream of the mixing valve 21 to detect the temperature of the mixed water, and a control valve 23 is provided downstream of the temperature sensor 22 for electrically controlling the stoppage of the mixed water.

The cylinder 18 is urged by a spring 24 in the direction of fully opening the water side, and is provided with a solenoid 26 as a driving device 25 for driving the cylinder 18, which is the mixing valve 21, and a plunger 27 driven by the solenoid 26. The cylinders 18 are connected by a connecting shaft 28. When the solenoid 26 is energized, the plunger 27 is pushed out and the connected cylinder 18 overcomes the spring 24 and slides to the hot water side! P1 nodal hole 1
9 increases the opening area facing the hot water flow path 14, and conversely, the opening area of the water side adjustment hole 20 facing the water flow path 15 begins to decrease.

In other words, depending on the current value applied to the solenoid 26, the balance position between the spring 24 that biases the cylinder 18 and the plunger 27 pushed out by electromagnetic force changes, that is, the opening area facing the hot water flow path 14 and the opening facing the water flow path 15. The area ratio changes and the temperature of the mixed water can be controlled freely. In addition, it is comprised of a setting device 29 that instructs the desired temperature and stop of hot water output, and a controller 30 that controls the amount of electricity supplied to the solenoid 26.

Next, the operation of the above configuration will be explained. The controller 30 controls the increase or decrease of the current supplied to the solenoid 26 based on the deviation between the temperature set by the setting device 29 and the temperature detected by the temperature detector 22. When this occurs, the control valve 23 stops the hot water supply while maintaining the current value applied to the solenoid 26 for a predetermined period of time (for example, 10 minutes).

When the stop time exceeds a predetermined time, the energization is canceled and the water is automatically returned to the fully open position.Next, when the setting device 29 instructs hot water to be dispensed, the control valve 23 is opened, but within the predetermined time. For example, the current value applied to the solenoid 26 is held for a specified time (for example, 1 second), and then the signal from the temperature detector 22 is taken in to start feedbank control.

As described above, when hot water is stopped, the temperature around the temperature sensor 22 will rise due to convection and heat transfer within the valve housing 17 for a predetermined period of time, and the next time hot water is turned on again, there will be a large overshoot and subsequent In order to prevent undershoot from occurring, the valve position of the cylinder 18, which is the mixing valve 21, is maintained, and a delay is provided when the hot water is re-discharged, and feedback control is started, so that the temperature does not become unstable when the hot water is re-discharged. Therefore, the user can use it with peace of mind.

In addition, if the stop continues for more than a specified time, the hot water in the hot water flow path will also cool down and become dead water, but by turning off the power to the mixing valve, you can save electricity and keep the water side fully open. ,
The next time you use hot water, you can quickly drain the dead water.

Effects of the Invention As described above, according to the hot water mixing device of the present invention, the following effects can be obtained.

(1) When hot water is re-discharged, it is safe because the desired temperature can be quickly obtained without overshooting or subsequent undershoot that suddenly deviates from the set temperature.

(2) If the stoppage continues for more than the specified time, the hot water in the hot water flow path will also cool down and become dead water, but since the mixing valve is fully open on the water side, the next time the hot water is turned on, the water will die quickly. can be discharged.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot water mixing device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional hot water mixing device. 14...Hot water flow path, 15...Water flow path, 2
1...Mixing valve, 22...Temperature detector,
23... Control valve, 25... Drive device,
29...Setting device, 30...Controller. Figure 2 2S-11 Hokin equipment

Claims (2)

[Claims] (1) A hot water flow path, a water flow path, a mixing valve that changes the flow rate ratio of hot water in the hot water flow path and water in the water flow path, a drive device that electrically drives the mixing valve, and a driving device that electrically drives the mixing valve. A temperature detector installed downstream to detect the temperature of the mixed water, a control valve that electrically controls the stop of the mixed water, a setting device that instructs to set a desired temperature and stop the hot water drawing, and a setting device that instructs the setting device to set a desired temperature and stop the hot water feeding and a controller that controls the mixing valve via the drive device based on the signal and the signal from the temperature sensor, and the controller closes the control valve when the setting device instructs the valve to stop during hot water dispensing. death,
The mixing valve maintains the valve position for a predetermined period of time, and when the predetermined period of time is exceeded, the mixing valve is driven to a fully open position on the water side. (2) The controller is configured such that when the setting device instructs to dispense hot water within a predetermined time, the control valve is immediately opened, but the mixing valve is held for a predetermined time and then starts temperature control. Hot water mixing device as described in section.