JPH01159545A - Hot/cold water mixing device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of overshoot by a method wherein the control unit of a hot water cold water mixing device, during the re-feed of hot water after one stop, a valve can be promptly driven to an original opening position responding to a set temperature. CONSTITUTION:A valve control deciding means 9 compares output signals from a temperature detecting means 4 and a temperature set means 8 with each other based on a hot water feed command to a flow regulating valve 3, And controls a feed hot water temperature T to a value approximately similar to a set temperature Ts. When control to shift hot water feed to a stop is effected by a control means 5, the opening positions of a hot water cold water mixing valve 1 and a flow regulating valve 3 are written in position memories 11 and 10, respectively, and a command to close the valve 3 is outputted to a flow regulating valve drive means 14. When control by the control means 5 is effected, a command by means of which the valve 1 is driven to an opening position stored in the hot water cold water mixing valve position memory 11 is outputted to a valve drive means 13, and meanwhile a command by means of which the valve 3 is driven to the opening of a flow regulating valve position memory 10 is outputted to the flow regulating valve drive means 14.

Description

Detailed Description of the Invention (Industrial Use Minute Hand) The present invention relates to a hot water mixing device that attempts to obtain hot water at a desired temperature by appropriately interlocking and adjusting the amount of hot water supplied and the amount of water supplied. Concerning improvement of the control unit.

(Prior Art) A hot water mixing device that attempts to obtain hot water at a desired temperature by adjusting the amount of hot water passing through a satsuma valve and the amount of water passing through a water valve is well known. Among these types of hot water mixing devices, there is one that can manually operate a first stop valve to maintain a constant amount of hot water and supply or stop the hot water supply. For example, there are washbasin clickers and shower clickers that have this type of mechanism, and in general, the operation mechanism is a one-stop button, one-stop knob, etc. because the purpose is to temporarily stop hot water supply. It is called.

In this case, even if the -degree hot water supply is stopped, the temperature control system continues to operate in preparation for the next hot water supply.

(Problem to be solved by the invention) Therefore, if such a one-stop state continues for more than a certain period of time and the water temperature near the hot water supply mouth drops, the temperature control system will follow the temperature drop and restore the set temperature. If possible, the hot water mixing valve will be moved to the high temperature side. If such control is executed, abnormally high temperature water (for example, boiling water) will be supplied when hot water is supplied again, which is dangerous, and overshoot will occur during subsequent control, making it difficult to reach stable temperature control. It took a while.

Therefore, it is an object of the present invention to provide a hot water mixing device that is safe and capable of stable control without discharging hot water when hot water is resupplied after a one-stop hot water supply is stopped.

(Means and effects for solving the problem) In order to achieve this object, the present invention provides a hot water mixing valve for mixing hot water and water from a water heater to adjust the hot water supply temperature; A flow control valve that adjusts the amount of hot water supplied by the mixing valve, a temperature detection means that detects the temperature of the hot water mixed by the hot water mixing valve, and a desired hot water supply temperature obtained via the hot water mixing valve is set. a temperature setting device for controlling the hot water supply, an operating means for instructing the start or stop of the hot water supply, and a driving control means for driving and controlling the hot water mixing valve to adjust the hot water supply temperature to the set temperature of the temperature setting device based on the output of the temperature detection means. and a control unit that controls opening and closing of the flow control valve based on a command to start or stop hot water supply from the operating means, wherein the control unit is located at a position that detects the opening position of the hot water mixing valve. and a position memory that stores the opening position of the hot water mixing valve at the time point when hot water supply by the operating means is stopped based on the output signal of the position detecting means, and when hot water supply is restarted, the hot water mixing valve is The valve control determining means is provided to drive the valve to the opening position stored in the position memory.

According to such a configuration, when reheating hot water after one-stop, the valve opening can be immediately driven to the original opening position for the set temperature, and therefore stable control can be performed without overshooting. can.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Note that the same reference numerals in each figure indicate similar objects.

FIG. 1 is a system diagram of a hot water mixing device M according to an embodiment of the present invention. In the figure, 1 is a mixing valve that adjusts the opening position so that a desired hot water temperature is obtained by interlocking the hot water supply valve 1a and the water supply valve 1b with a motor or the like or driving the respective valves, and 2 is the hot water mixing valve 1. 3 is a flow control valve that is opened and closed to supply hot water at a desired flow rate; 4 is a temperature detection means having a thermistor 4a installed in the middle of the mixing pipe 2; 5 is a hot water supply system; Operating means for starting and stopping operations; 6 is a hot water mixing valve position detecting means such as a step motor (also serving as a drive motor for the hot water mixing valve 1) for detecting the opening position of the hot water mixing valve 1; 7 is a flow control valve 3; 8 is a temperature setting means for setting a desired hot water supply temperature; 9 to 14 are valve control determining means and flow regulating valve position, which are components of the control unit, respectively; These are a flow control valve position memory that stores the detection value of the detection means 7, a mixing valve position memory that stores the detection value of the hot water mixing valve position detection means 6, a valve speed calculation means, a valve drive means, and a flow control valve drive means. These configurations will be explained below, focusing on the control unit.

The valve control determining means 9 firstly detects the temperature detecting means 4 and the temperature setting means 8 based on the hot water supply command such as the stop valve 3.
, and control the hot water supply temperature T to approach the set temperature T5.Secondly, when there is an operation of heating/stopping the heating by the operation means 5, the hot water mixture at the time of the operation is controlled. The opening positions of the valves and flow control valves are respectively written in the position memory 11.10, and a command to close the flow control valve 3 is output to the flow control valve driving means 14, and then the operating means 5 performs the stop → hot water supply operation. If so, a command to drive the hot water mixing valve 1 at the maximum speed to the opening position stored in the hot water mixing valve position memory 11 is outputted to the valve driving means 13 as described above, and the one-way flow regulating valve 3 is flow controlled. A command to open the valve to the opening position stored in the valve position memory 10 is output to the flow control valve driving means 14.

The mixing valve position memory 11 is used to write the opening position of the hot water mixing valve at the time of hot water supply from the mixing valve position detecting means 6, using the hot water supply stop command from the operating means 5 as a set signal S2. Similarly, the flow control valve position memory 10 reads the opening position of the flow control valve 3 at the time of hot water supply from the flow control valve position detection means 6, using the hot water supply stop command from the operation means 5 as a set signal S1. The contents of these hot water mixing valve and flow control valve position memories 11.10 are read out by a command signal from the valve control determining means 9 itself, and the stored contents of these position memories are read out by a set signal S which is a hot water supply stop command from the operation means 5. It is updated every time it is manually updated.

The valve speed calculating means 12 calculates the opening/closing speed of the valve based on the type of output signal of the valve control determining means 9. For example, in the first control described above, normal opening/closing control is executed, and in the second control, a command is given to move eight lines at the maximum speed to the valve position stored in the mixing valve position memory 11. Such a valve speed calculation means 12 can be configured, for example, by a table memory storing patterns of various valve opening/closing speeds, and uses a part of the output signal of the valve control determining means 9 as an address signal to generate the opening/closing speed signal. Can be read.

The hot water mixing valve driving means 13 is connected to the valve control determining means 9
This is for forming a drive signal for controlling the opening and closing of the hot water mixing valve 1 according to the control method determined by the control method and the calculation speed determined by the valve speed calculation means 12, for example, a signal for determining the rotation direction of the motor and a motor control signal. It forms PWM signals etc.

Hereinafter, the operation of the embodiment from the stop of hot water supply to the re-supply of hot water according to the present invention will be explained with reference to the flowchart of FIG. Note that in the following explanation, numbers (18) to (29) correspond to each block number in the flowchart. Also,(
22Y) and (22N) indicate that the decision of the decision block 22 is positive and negative, respectively.

First, when a command to stop hot water supply is generated by operating the operating means 5, a set signal S is generated, and the flow control valve position memory 10 is
The opening position of the flow control valve 3 and the opening position of the hot water mixing valve 1 at the relevant time point are stored in the hot water mixing valve position memory 11 based on the detection values of the respective detection means 7.6 (18). Next, close the flow control valve 3 (19)
At the same time, drive the hot water mixing valve 1 to a predetermined position 20)
, stop (21). In the present invention, step (20) may be omitted, or instead of steps (20) and (21), the mixing valve may continue to be driven by temperature control as usual. .

Thereafter, the valve control determining means 9 visually checks whether or not the restart of hot water supply starts (22Y) or not (22N) (22), and when the hot water supply starts, the hot water mixing valve 1 is placed at the valve position stored in the position memory 11. The valve speed calculating means 12 and the valve driving means 13 are operated so as to move 8 lines at full speed (2
3). At this stage, a subroutine is executed to check whether the hot water mixing valve 1 is operating normally (
24) Since the contents of this subroutine can be well-known, their explanation will be omitted. It is checked at regular intervals whether the opening degree of the hot water/water mixing valve l has reached the position stored in the position memory 11 (25), and the valve driving means 13 is operated until the opening degree reaches the position (25N), and step (25) is performed.
23) and (24) are repeated. As a result, when the hot water mixing valve 1 reaches the memorized opening position (25Y), the flow regulating valve driving means 14 is operated in order to open the flow regulating valve 3 to the valve position memorized in step 18 (25Y).
6). At this stage, while similarly executing the fault check subroutine (27), it is checked at regular intervals whether or not the opening degree of the flow control valve 3 has reached the position stored in the position memory (28). The flow control valve driving means 14 is operated until the flow reaches the point (28N), and step (2
6).

Repeat (27). As a result, when the flow control valve 3 reaches the memorized opening position (28Y), the routine returns to the normal temperature control (29), and from then on, the temperature setting means 8
Control is performed so that the set temperature at this point in time is equal to the hot water supply temperature.

FIG. 3 shows a sectional front view showing a hot water mixing valve according to the present invention, and this hot water mixing valve will be explained below.

The hot water mixing valve 1 is housed inside the box A, and is installed at a convenient location for supplying hot water to the bathroom or kitchen, for example.

On the left and right sides of the upper end of the hot water mixing valve, short pipes are set up to form a water inflow part 30 and a hot water inflow part 31, respectively.The water inflow part 30 is connected to a water supply pipe 30a, and the hot water inflow part 31 is connected to a water heater, etc. The communicating hot water supply pipes 31a are connected to each other.

A mixing valve body 32 and a switching valve body 33 are arranged coaxially at the upper end and the lower end of the hot water mixing valve 1, respectively, and the switching valve switches the flow path to the first outlet part 34 and the second outlet part 35 at the lower end. Performed by body 5.

The mixing valve body 32 has a cylindrical shape with an open lower end, and has a water inlet hole 32a on the upper side and a hot water inlet hole 32b on the lower side, and has a spindle 32c protruding from the upper end, and a water passage passing through the inside at the lower end. Flow rectifier 3 for rectifying the mixed water of water and hot water
2d is provided. Further, a water inflow chamber 36 and a hot water inflow chamber 37 communicating with the flow paths from the water inflow section 30 and the hot water inflow section 31 are provided on the left and right sides of the hot water/water mixing valve 1 so as to correspond to the water inflow hole 32a and the hot water inflow hole 32b. It is formed.

The opening centers of the water flow manhole 32a and the hot water inflow hole 32b are set at positions separated by a predetermined angle from the axis of the mixing valve body 32. Therefore, when the mixing valve body 32 is rotated, the water inflow The hole 32a and the hot water inflow hole 32b communicate with the water inflow part 30 and the hot water inflow part 31 at different valve opening degrees, thereby making it possible to mix hot water and water. Further, the opening size and mutual positional relationship of the water inflow hole 32a and the hot water inflow hole 32b are set such that both water and hot water from the water inflow section 30 and the hot water inflow section 31 can be completely closed. When the mixing valve body 32 is rotated from the point where the water is completely cut off, water and hot water are mixed, and when only water is supplied, only the water inlet hole 32a is fully opened or When only hot water is supplied, only the hot water inflow hole 32b can be fully opened.

The switching valve body 33 is similarly cylindrical with an open upper end, and has a mixed water outlet hole 33a in its peripheral wall and a spindle 33b in its lower end. A first outflow chamber 34 communicates with a first outflow portion 34 and a second outflow portion 35 on the left and right sides of the switching valve body 33, respectively.
a and a second outflow chamber 35a are provided.

The above-mentioned mixing valve body 32 and switching valve body 33 are arranged coaxially, and their rotation causes the mixing and flow rate of hot water and the first
, switches the flow path to the second outlet 34,35. And an electric motor 12a for rotationally driving the mixing valve body 32 and the switching valve body 33.

40 respectively, and the rotation of the output shaft is controlled by the reducer 11.
a, spindle 32c via 12a.

33b.

A communication passage 41 is formed between the mixing valve body 32 and the switching valve body 33 so as to have a passage axis that coincides with the axis of these valve bodies. An impeller-type flow rate detection device 4 that rotates due to the flow of water is provided on the upper side of the communication channel 41.
2, and a temperature sensor 4 serving as a temperature detection means for detecting the temperature of the mixed water is arranged on the lower side.

Here, the mixing degree of hot water and water is determined by the rotation of the mixing valve body 32, and the rotation angle of the mixing valve body 32 determines the mixing ratio of water and hot water, so it becomes a temperature setting element of the mixed water, and the temperature sensor 4 Based on the detection signal, the electric motor 12a is driven and controlled so that the required mixed water temperature is obtained. In addition, since the switching valve body 33 supplies mixed water to either the first outflow portion 34 or the second outflow portion 35, a switch is provided to select either of these, and the outflow side changes depending on the rotation angle of the switching valve body 33. The electric motor 40 is driven and controlled so that the flow rate of the mixed water can be set.

In the above configuration, the operation panel P includes a switch as the operating means 5 for starting and stopping hot water supply, and a setting device as the temperature setting means 8, and the valve control determining means 9 determines the temperature of the motor 12a based on these pieces of information.

40 to perform control according to the present invention.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, hot water with an abnormally high temperature, such as boiling water, is not discharged when hot water is re-supplied after one-stop, and it is safe, and the opening of the hot water mixing valve can be immediately driven to the steady opening position relative to the set temperature, so overshoot does not occur and stable and efficient control can be performed.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a hot water mixing device according to an embodiment of the present invention, Fig. 2 is a flowchart for explaining the operation of the hot water mixing device according to an embodiment of the present invention, and Fig. 3 shows a hot water mixing valve. It is a cross-sectional front view. In the drawing, 1 is a hot water mixing valve, 2 is a mixing pipe, and 3 is a hot water mixing valve.
4 is a flow control valve, 4 is a temperature detection means, 5 is an operation means, 6 is a mixing valve position detection means, 7 is a flow control valve position detection means, 8 is a temperature setting means, 9 is a valve control determination means, 10 is a flow control Valve position memory, 11 is mixing valve position memory,
12 is a valve speed calculating means, 13 is a hot water mixing valve driving means, and 14 is a flow regulating valve driving means.

Claims (1)

[Scope of Claims] A hot water mixing valve for mixing hot water and water from a water heater to adjust the hot water supply temperature, a flow control valve for adjusting the amount of hot water supplied by the hot water mixing valve, and the hot water temperature detection means for detecting the temperature of the hot water mixed by the mixing valve;
a temperature setting device for setting a desired hot water supply temperature obtained via the hot water mixing valve; an operating means for commanding the start or stop of the hot water supply; and the temperature setting device for setting the hot water supply temperature based on the output of the temperature detection means. A hot water mixing device comprising: a control unit that drives and controls the hot water mixing valve to adjust the temperature to a set temperature; and a control unit that controls opening and closing of the flow control valve according to a command to start or stop hot water supply from the operating means; The unit includes a position detecting means for detecting the opening position of the hot water mixing valve, and a position storing means for storing the opening position of the hot water mixing valve at the time when hot water supply is stopped by the operating means based on an output signal of the position detecting means. A hot water mixing device comprising: a position memory; and valve control determining means for driving the hot water mixing valve to an opening position stored in the position memory when hot water supply is resumed.