JPH0345831A - Hot water mixing device - Google Patents

Abstract

PURPOSE:To enable a safe and rapid accomplishment of a desired temperature to be attained by a method wherein a controller may control any temperature as a temporary set value when a difference amount between a signal of a setting device and another signal from a temperature sensor exceeds a predetermined value and after this operation, it performs a controlling operation in respect to an initial setting temperature. CONSTITUTION:A position where a spring 24 biasing a cylinder 15 is balanced with a plunger 27 pushed by an electromagnetic force is varied in response to an electrical current value energized in a solenoid 26. A ratio between an opening area adjacent to a hot water passage 11 and another opening area adjacent to a water flow passage 12 is varied and then a temperature of mixed water can be freely controlled. Although a controller 30 may control an amount of increasing or decreasing of an electrical current flowing in the solenoid in response o a difference value between a temperature set by a setting device 29 and another temperature detected by a temperature sensor 23, if the difference exceeds a predetermined value, the difference value is equally divided into two segments, a specified electrical current value is added until it shows a half difference value and if it is decreased more than the half difference value, it is controlled with an electrical current value corresponding to a normal difference value.

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. 4, 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, a mixing valve 4 downstream of the automatic pressure regulating valve 3, and a mixing valve driving device 5.
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, and the valve jll+7.
a screw mechanism 9 for converting rotation into thrust; a temperature detector 10 provided downstream of the mixing valve 4; a setting device 11 for setting a desired temperature; and a controller 1 for controlling the motor 6.
It consists of 2.

Problem to be Solved by the Invention The controller 12 compares the temperature set by the setting device 11 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. It controls the valve 4 to obtain mixed water at a desired temperature.Generally, the rotation speed of the motor 6 is increased in proportion to the amount of deviation. When the setting is changed, the deviation amount from the temperature detected by the temperature detector 10 at the time when the setting change is instructed is -larger, and the motor 6 is driven at the maximum rotation speed. If the valve sensitivity of the R'tR joint venture 4 is high, a large overshoot may occur. Also, to avoid overshoot,
If the number of rotations of the motor 6 is suppressed, it takes time for the temperature to stabilize, which may result in poor usability.

The present invention solves such conventional problems, and aims to provide a hot water mixing device that is safe and easy to use regardless of the size of change in temperature setting.

Means for Solving the Problems In order to solve the above problems, the hot water mixing device of the present invention includes a valve casing having a vortex flow path, a water flow path, and an outflow path, and a valve housing having a vortex flow path, a water flow path, and an outflow path; A mixing valve that changes the flow rate ratio,
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;
The controller includes a setting device that sets a desired temperature, and a controller that controls the mixing valve via the drive device with a control amount corresponding to a deviation amount between the signal of the setting device and the signal of the temperature detector, and When the deviation amount between the signal of the setting device and the signal of the temperature detector exceeds a predetermined value, the controller controls an arbitrary temperature between them as a temporary setting value, and then controls the temperature to the initial setting temperature. The configuration was designed to control.

Effect With the above configuration, when the deviation amount between the signal of the setting device and the signal of the temperature sensor exceeds a predetermined value, the deviation amount is divided and the set value corresponding to the divided deviation amount is used as the temporary set value. After that, the driving device is operated with a control amount corresponding to the remaining deviation amount in accordance with the initial set value, and the mixing valve is controlled in stages so that the temperature becomes equal to the final set 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 14 having a hot water flow path 11, a water flow path 12, and one outflow path 13, and a cylinder 15 that slides inside the valve housing 14 has a cylinder 15 on its outer periphery for the flow of hot water on the hot water side. A hot water side adjustment hole 16 for adjusting the flow rate of the water side and a water side adjustment hole 17 for adjusting the flow rate of the water side are provided.
It forms a mixing valve 1B in which the flow rate ratio of hot water and water changes by sliding. A hot water side stirring plate 20 and a water side stirring plate 2 each having a large number of small holes 19 in the axial direction inside the cylinder 15.
1 are provided facing each other, and the hot water that has passed through the two disturbance plates 20 and 21 collides with each other and is mixed, passes through an orifice 22, and a temperature detector 23 detects the temperature of the mixed water. The cylinder 15 is biased by a spring 24 in the fully open direction, and the cylinder 1 which is the mixing valve 18
A solenoid 26 and a plunger 27 driven by the solenoid 26 are provided as a driving device 25 for driving the solenoid 5,
The plunger 27 and the cylinder 15 are connected by a connecting shaft 2B.

When the solenoid 26 is energized, the plunger 27 is pushed out and the connected cylinder 15 overcomes the spring 24 and slides, increasing the opening area of the hot water side adjustment hole 16 to the hot water flow path 11, and conversely, the water side adjustment hole 17 increases. The opening area facing the water flow path 12 begins to be reduced. In other words, depending on the current value applied to the solenoid 26, the balance position between the spring 24 that biases the cylinder 15 and the plunger 27 pushed out by electromagnetic force changes. The ratio of the opening area changes, and the temperature of the mixed water can be controlled freely. In addition, it is comprised of a setting device 29 for setting a desired temperature and a controller 30 for controlling the amount of electricity supplied to the solenoid 26.

Figure 2 shows a block diagram of temperature control.

The controller 30 controls the increase or decrease of the current supplied to the solenoid based on the amount of deviation between the temperature set by the setting device 29 and the temperature detected by the temperature detector, but if the amount of deviation exceeds a predetermined amount. The configuration is such that the amount of deviation is divided into two equal parts, a constant current value is added until the amount of deviation is halved, and when the amount of deviation is cut in half, control is performed using the current value corresponding to the normal amount of deviation. It becomes.

As a second embodiment, another block diagram is shown in FIG.

The controller 30 controls the increase or decrease of the current supplied to the solenoid in response to the deviation between the temperature set by the setting device 29 and the temperature detected by the temperature detector, but if the deviation exceeds a predetermined amount. In this case, the intermediate value between the current temperature and the set temperature is temporarily regarded as the set temperature and control is performed, and if the deviation amount from the set temperature is within the specified amount, the control is immediately returned to the initial set temperature. Let's do it! It is a precept.

As described above, in both of the two embodiments, when P1 control and P[) control are used, the larger the deviation amount, the larger the operation amount, and when returning the water to the appropriate temperature, the setting This is a safe control law that is used to avoid the danger of overshooting due to a large amount of deviation at the point in time when the control amount is too large.
It is also easy to use.

Effects of the Invention As described above, the hot water mixing device of the present invention includes 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 driving device that electrically drives the mixing valve, and a driving device that electrically drives the mixing valve. A drive device is controlled by a temperature detector provided downstream of the valve to detect the temperature of the mixed water, a setting device to set the desired temperature, and a control amount corresponding to the deviation amount between the signal of the setting device and the signal of the temperature detector. mm controller that controls the mixing valve via the controller, and when the deviation amount between the signal of the setting device and the signal of the temperature sensor exceeds a predetermined value, the controller temporarily sets an arbitrary temperature between them. By adopting a configuration in which the temperature is controlled as a value and then controlled against the initial set temperature, overshoot and undershoot will not occur even if the temperature setting is changed over a large range, making it safe.
Moreover, it has the effect of improving usability, such as being able to quickly obtain the desired temperature.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a hot water mixing device in one embodiment of the present invention, FIG. 2 is a block diagram showing the flow of control thereof, and FIG. 3 is a flow diagram of control of the hot water mixing device in the second embodiment. Block Diagram FIG. 4 is a block configuration diagram showing a conventional hot water mixing device. 11...Hot water flow path, 12...Water flow path, 1
4...Outflow path, 18...Mixing valve, 23
...Temperature detector, 25...Drive device,
29...Setting device, 30...Controller.

Claims (1)

[Claims] A valve housing having a hot water flow path, a water flow path, and an outflow 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, and a drive device that electrically drives the mixing valve. a temperature detector for detecting the temperature of the mixed water provided downstream of the mixing valve; a setting device for setting a desired temperature; a controller that controls the mixing valve via the drive device according to a control amount, and when the deviation amount between the signal of the setting device and the signal of the temperature sensor exceeds a predetermined value, A hot water mixing device configured to control any temperature between them as a temporary set value, and then control to the initial set temperature.