JPH0277810A - Hot water and cold water mixing device - Google Patents

Abstract

PURPOSE:To discharge high-temperature water and low-temperature water alternately at a normal period by resetting the set temperatures of the high- temperature water and low-temperature water between hot water supply temperature and cold water supply temperature unless the temperature of the high- temperature water and low-temperature water reaches the set temperatures. CONSTITUTION:In the controller for the hot water and cold water mixing device A, a hot water mixing plug B, a solenoid valve 29, and an automatic selector valve D are operated by a controller C and the hot water and cold water mixing device A is automated. If the temperatures of the high-temperature water and low-temperature water does not reach the set temperature within a constant time, it is considered that the temperature of, for example, the high or low temperature water is set higher or lower than the hot water or cold water temperature, and the set temperatures of the high-temperature water and low- temperature water is reset between the hot water temperature and cold water temperature. Consequently, a wrong setting is corrected and the high-temperature water and low-temperature water can be discharged alternately at the normal period.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a hot water mixing device.

(b) Conventional technology Conventionally, there has been a hot water mixing device that receives hot water supply and water supply and alternately discharges high temperature water and low temperature water at set temperatures at a predetermined cycle. It is configured such that the user can arbitrarily set the water temperature and the switching cycle between high temperature water discharge and low temperature water discharge.

(C) Problem to be Solved by the Invention However, generally speaking, the temperature of mixed hot water obtained by mixing hot water cannot exceed the range between the hot water supply temperature and the water supply temperature. Since the temperature of low-temperature water can be set arbitrarily, if the temperature of hot water is set higher (lower) than the hot water temperature by mistake, the temperature of hot water discharged from the hot water mixing device will be lower. There is a problem in that the temperature of low (low) hot water does not reach the set temperature no matter how long it takes, and as a result, switching between high temperature water and low temperature water is not performed or the switching cycle is irregular.

(d) Means for Solving the Problems The present invention provides hot water in which the temperature of the mixed hot water that is discharged after receiving hot water supply is continuously and periodically changed between high and low set temperatures. In a mixing device, if the temperature of high and low temperature water does not reach the set temperature within a certain period of time,
It is an object of the present invention to provide a hot water mixing device characterized in that the set temperatures of high temperature water and low temperature water are reset between the hot water supply temperature and the water supply temperature.

(E) Functions and Effects According to the present invention, if the temperature of high-temperature water and low-temperature water does not reach the set temperature within a certain period of time, the temperature of hot water is lowered to lower than the hot water (water) temperature. The set temperatures of high and low temperature water are reset to between the hot water temperature and the water supply temperature, assuming that the temperature has been set too high (low). and low-temperature water can be alternately discharged.

Although there is a difference between this reset temperature and the temperature originally set by the user, it is the temperature that is closest to the temperature originally set by the user obtained from the hot water supply and water supply temperatures,
High-temperature water and low-temperature water are now switched at predetermined intervals, and although there are some differences from the temperature set by the user, high-temperature water and low-temperature water are alternately discharged under the next best setting conditions. can be done.

(f) Examples The present invention will be explained in detail below based on examples shown in the attached drawings.

FIGS. 1 to 4 show a hot water mixing device (^) equipped with a valve shaft position detection mechanism according to the present invention.

First, to explain the overall configuration of the hot water mixing device (A), in FIGS.
) is a control device W(C) such as a microprocessor, which will be described later.
The inflow side opening (1) of the hot water mixing faucet (B) controlled by
4015) through seal rings (16) and (17).

In addition, the hot water mixing faucet (B) has a cylindrical valve body (13) and a valve shaft (13a) of the cylindrical valve body (13).
It is composed of a drive motor (13c) such as a stepping motor connected via an I (13b).

In addition, the water supply/hot water supply pipe (11H12) is provided with a check valve (19) (20) with a strainer in the middle thereof.

Further, below the hot water mixer faucet CB), there is a spout fitting for a bathtub (30), a spout fitting for a washbasin (31), and a shower head (32), which are connected to the outflow side opening (21).
An 11-shaped connecting pipe (22
) are provided.

In addition, on the downstream side of the connecting pipe (22), as shown in Figures 1 and 4, there is a rectifier (23) and a water flow sensor (2).
4) and a temperature sensor (25) are provided in sequence.

In addition, as shown in Fig. 2, the connecting pipe (22) has its downstream end branched into three directions, including a bathtub branch pipe (26), a washbasin branch pipe (27), and a shower branch pipe. I am in contact with (28).

And, in the middle of the branch pipe for the bathtub (26), there is a solenoid valve =
5- (29) is attached, and its lower end is connected to the fifth
As shown in the figure, it is communicatively connected to a bathtub spout fitting (30) attached to a bathroom wall or the like.

On the other hand, the branch pipe for the washbasin (27) and the branch pipe for the shower (
28) are connected to the washbasin spout fitting (31) and the shower head (32), respectively, as shown in FIG.

In addition, a connecting pipe (22) and a branch pipe for the bathtub (26) are also provided.
), washbasin branch pipe (27) and shower branch pipe (2)
As shown in Figs. 1, 2, and 5, an automatic switching valve (D) consisting of a four-way valve is installed in the communication part with the bathtub (22). branch piping (26),
Branch pipe for washbasin (27) or branch pipe for shower (28)
It is possible to selectively communicate with any of the following.

Note that the automatic switching valve (D) is the hot water mixing faucet (B) described above.
Similarly, a cylindrical valve body (33) and a drive motor (such as a stepping motor) connected to the valve shaft (33a) of the cylindrical valve body (33) via a reducer #I (33b), which will be described later.
33c), and is controlled by a control device (C) as described later.

FIG. 5 shows a conceptual control circuit of the hot water mixing device (A), and as shown, the hot water mixing faucet (B), the solenoid valve (29), the automatic switching valve (1)) is operated by the control device (C), making it possible to automate the hot water mixing device (A).

As shown in the flowchart of FIG. 6, the above program starts when the hot water mixing device (A) starts to be used (100) and initializes the control device FC).

This initialization (101) resets the half-cycle timer (■1) of the set cycle provided in the control device (C) and the timer (■2) for detecting the actual time required for switching, and The output is output to the motor (13c) and the cylindrical valve body (
13) is driven to the water discharge side.

Next, a switching time upper limit timer (3) set to a time longer than a half cycle is set (102).

Next, the temperature of the water flowing through the connecting pipe (22) is detected by the temperature sensor (25), and the detected value (■11) is compared with the low temperature set value (Ts), and it is determined that the detected value reaches the set temperature. If not, the temperature PD is calculated based on the formula shown in (103).
Sub-control 104) is performed to repeatedly perform a control operation to bring the temperature of the discharged water to the set value as quickly as possible.

In addition, in the same equation, υ is the rotation speed of the drive motor (13c),
where d is the differential gain, and dT/dt is the differential of temperature change with respect to time.

During this control operation (104), the switching time upper limit timer (■
3) times up (105), each time the real-time timer (T2) times up, 1 is added to the counter (106), and if this is equal to a certain value or is larger (107), the set temperature is changed to the hot water mixing device. (A
) and reset the temperature to be close to the temperature of the hot water supplied to (1).
08).

That is, it is not possible to determine whether the lengthening of the cycle is due to the water temperature or the gain (p) from only the -th water temperature control operation, so the gain (p) becomes larger. Therefore, I counted the number of control operations with a counter, and
If the high temperature side detected value (Tsh) does not reach the set temperature even if the number of control operations reaches the preset number (a), the detected value (Tn+) or the set temperature (Tsh
).

Note that, as the temperature setting value to be newly reset, the value closest to the setting value reached by the discharged water during the above control operation can be used.

Next, based on the formula shown in (109), in order to make the temperatures of the high-temperature water and low-temperature water that are alternately discharged match the set values, and to match the switching cycle of high-temperature water and low-temperature water discharge to the set cycle. The PD sub-control gain (p) is corrected.

Also, if the temperature of the discharged water reaches the set temperature during the above control operation (111), or if the value obtained by adding 1 to the time measured by the real-time timer (■2) is smaller than a certain value (112)
), PD sub-control gain (
Jump to p) modification.

Then, switching between high-temperature water discharge and low-temperature water discharge is performed (111), and the process returns to step (102) to repeat the aforementioned control operation.

As a result of the above control operation, the temperature of the mixed hot water that is discharged is as shown in Figure 7, where the high and low temperature water was switched at irregular intervals due to incorrect settings, but the temperature settings are changed again. As a result, high and low temperature water is alternately discharged at the set period between the reset high and low temperature water temperature settings.

As a result of the above control, as shown in Fig. 7, when the water mixing device (A) starts discharging water, it starts discharging low-temperature water first, but the temperature of the discharged water is set lower than the supply water temperature. Therefore, if the temperature of the discharged water does not reach the set temperature and the time set in the switching time upper limit timer (■3) has elapsed, the set temperature of the low-temperature water will be set to the lowest temperature that the discharged water has reached up to that point. After fixing it, it will be possible to switch to high temperature water discharge.

Also, in the case of high-temperature water, the temperature of the discharged water is set higher than the hot water supply temperature, so if the temperature of the discharged water does not reach the set temperature and the time set in the switching time upper limit timer (■3) has elapsed, Then, the set temperature of the high temperature water is reset to the highest temperature that the discharged water has reached up to that point, and then the second low temperature water discharge is performed.

In the second and subsequent discharges of high/low temperature water, since the set temperature has already been reset, the switching cycle is indefinite, but high/low temperature water at the reset temperature is alternately discharged.

Such an irregular switching cycle converges while the discharge of high and low temperature water is repeated several times, and high temperature water and low temperature water are alternately discharged at a set temperature and cycle.6 Embodiments of the present invention is configured as described above, and generally the temperature of mixed hot water obtained by mixing hot water cannot exceed the range between the supplied hot water and the water supply temperature, so even one of the temperature setting values is outside the above range. However, in the present invention, as described above, when the temperature of the discharged water does not reach the temperature set value within a predetermined time, the set temperature cannot be controlled. By resetting the
It is now possible to alternately discharge high and low temperature water at the temperature closest to the set temperature obtained from the hot water temperature and the water supply temperature at a set cycle, although there may be some difference from the user's set temperature. However, it is possible to perform suboptimal temperature control and control of the switching cycle of high and low temperature water discharge.

[Brief explanation of the drawing]

FIG. 1 is a front sectional explanatory view of a hot water mixing device according to the present invention. FIG. 2 is an explanatory plan cross-sectional view of the hot water mixing faucet. FIG. 3 is a sectional view taken along line II in FIG. Figure 4 is a sectional view taken along line ■-■ in Figure 1. FIG. 5 is a conceptual explanatory diagram of a shower device using the groove faucet of the present invention. FIG. 6 is a flowchart of control operation. FIG. 7 is a graph showing the state of discharge water temperature control. (A): Hot water mixing device

Claims (1)

[Claims] 1) The temperature of the mixed hot water that is discharged after receiving hot water and water supply,
In a hot water mixing device (A) that continuously and periodically changes the temperature between high and low set temperatures, if the temperature of high temperature water and low temperature water does not reach the set temperature within a certain period of time, high temperature water and a hot water mixing device characterized in that the set temperature of the low-temperature water is reset between the hot water supply temperature and the water supply temperature.