JPH0630024B2 - Hot water mixing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing apparatus for adjusting a mixing ratio of hot water and water to obtain an appropriate temperature.

2. Description of the Related Art A conventional hot and cold water mixing apparatus of this type is shown in FIG. (For example, Japanese Utility Model Laid-Open No. 55-59223) In FIG. 3, a hot water inlet 1, a water inlet 2 and a mixed hot water outlet 3
A hot water side valve body 5 and a water side valve body 6 are provided inside the valve frame body 4 having the above to adjust the mixing ratio of hot water and water.
The hot water valve body 5 and the water valve body 6 are fixedly provided on a shaft 7, and the shaft 7 is driven by a motor 10 via an external screw mechanism 8 and a gear 9. The temperature of the mixed hot water is detected by the temperature detector 11, and the controller 10 drives and controls the motor 10 so as to eliminate the temperature deviation from the temperature setting device 12, thereby adjusting the mixed hot water temperature. That is, when the temperature of the mixed hot water to be obtained is set by the temperature setting device 12, the temperature detector 11
While monitoring the temperature of the mixed hot water, the hot water valve body 5 and the hot water valve body 6 are controlled to positions where the motor 10 can obtain an appropriate temperature.

Problems to be Solved by the Invention Since the conventional hot and cold water mixing apparatus is configured as described above, it has the following problems.

(1) When the supply of the mixed hot water is stopped due to the faucet being closed, the temperature around the temperature detector 11 is cooled by natural cooling, and accordingly, the mixed hot water temperature indicated by the temperature setting device 12 is changed. Since the hot water valve body 5 is driven in the opening direction and the water side valve body 6 is driven in the closing direction to obtain the hot water, hot water is supplied when the hot water supply is restarted, which is dangerous.

(2) In addition to this, the hot water valve body 5 and the hot water valve body 6 moved during the course of closing the faucet and the like, and the hot water mixture sometimes overshooted or undershooted when the hot water was again tapped. This is because the pressure loss between the hot water and water at the hot water valve 5 and the hot water valve 6 decreases as the flow rate decreases, and the difference in pressure change between hot and cold water greatly affects the valve position. The reason is that the valve position is different between the large flow rate and the small flow rate even with the same mixed hot water temperature.

The present invention solves the above-mentioned conventional problems, and stops the movement of the mixing valve in response to the supply / stop of the mixed hot water to prevent the supply of the hot water at the time of restarting the hot water supply and the overshoot / undershoot. The purpose is to

Means for Solving the Problems In order to solve the above problems, the hot and cold water mixing apparatus of the present invention controls a mixing valve for adjusting a mixing ratio of hot water and water, a driving device for driving the mixing valve, and a mixed hot water temperature. A mixed hot water temperature detector for detecting, a mixed hot water temperature setting device for setting the mixed hot water temperature, an electrically controlled control valve for supplying / stopping the mixed hot water, a hot water start / stop signal, and a drive device Comparing the signals of the hot water supply indicator that simultaneously receives the start and stop signals with the signals of the mixed hot water temperature setting device and the mixed hot water temperature detector, the drive of the drive device is controlled and the mixing ratio is adjusted.
The control valve is opened / closed by the signal of the hot water supply indicator to supply / stop the mixed hot water, and when the hot water indicator instructs to stop the hot water supply, the control valve is closed after stopping the drive device of the mixed valve. Then, it is provided with a controller for stopping the hot water supply.

Function The present invention compares the mixed hot water temperature set by the mixed hot water temperature setting device with the above-described configuration with the mixed hot water temperature detected by the mixed hot water temperature detector, and eliminates the deviation between them by the mixing device via the drive device. In addition to controlling the hot water supply, the control valve is opened / closed by the signal from the hot water supply indicator to start / stop the hot water supply with a light operation. Then, when the stop of the hot water supply indicator is instructed, first, the drive device of the mixing valve is stopped, and then the control valve is closed to stop the supply of the mixed hot water. It prevents the valve from being fully opened, and it has a large difference from the set temperature due to hunting due to arrival delay of mixed hot water that occurs when the flow rate decreases when hot water supply is stopped, uneven mixing, uneven flow, etc., and deterioration of temperature controllability. This prevents the mixed hot water from accumulating in the mixed hot water path, and prevents the hot water from being supplied at the time of re-leaving hot water, and prevents the mixed hot water from largely overshooting or undershooting.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, inside a valve frame body 17 having a hot water inlet 14, a water inlet 15, and a mixed hot water outlet 16, a pressure regulating valve 18 for equalizing the pressure of the hot water and the water, and a mixing ratio of the hot water and the water are provided. A mixing valve 19 for adjusting and a mixed hot water temperature detector 20 for detecting the mixed hot water temperature are incorporated.

The mixing valve 19 is driven by a driving device 24 provided outside the hot water valve body 21 and the water valve body 22 via a shaft 23. This drive unit is composed of a motor 25, a gear box 26 and the like. The mixed hot water that has left the valve frame 17 is the mixed hot water path 2
7. The hot water is supplied from the discharge port 29 to the hot water supply target through the control valve 28 for stopping the supply of the mixed hot water. A mixed hot water temperature setting device 30 and a hot water supply indicator 31 for instructing start / stop of hot water supply are provided in the vicinity of the discharge port 29. This hot water supply indicator 31,
The signals from the mixed hot water temperature setting device 30 and the mixed hot water temperature detector 20 are fetched by the controller 32, and the controller 32 is connected to the drive unit 24 and the control valve 28.

As shown in FIG. 2, the inside of the controller 32 receives a signal from the comparison unit 33, which compares the signals from the mixed hot water temperature setter 30 and the mixed hot water temperature detector 20 to obtain a temperature deviation, and a signal from the comparison unit 33. And an adjusting unit 34 for setting the driving amount of the driving device 24.
Further, the drive device 24 is started and stopped by a signal from the hot water supply indicator 31.

To describe the operation of the above configuration, first, the hot water supply indicator 31
When the start of hot water supply is instructed at, the control valve 28 is opened and the hot water discharge of the mixed hot water is started. The pressures of the hot water and the water that have entered the valve frame body 17 from the hot water inlet 14 and the water inlet 15 are equalized by the pressure regulating valve 18, and then enter the mixing valve 19. The mixing ratio of hot water and water is adjusted by the mixing valve 19, and the temperature of the mixed hot water is detected by the mixed hot water temperature detector 20. On the other hand, in the controller 32,
The setting signal set by the mixed hot water temperature setter 30 and the signal of the temperature detected by the mixed hot water temperature detector 20 are compared by the comparison unit 33 and are transmitted to the adjustment unit 34 as a deviation signal. A signal for driving the drive device 24 is transmitted to the adjustment unit 34 based on the preset relationship between the deviation signal and the drive amount. In this way, the mixing valve 19 is controlled to a mixing ratio at which the temperature set by the mixed hot water temperature setting device 30 can be obtained. The mixed hot water having an appropriate temperature is supplied to the hot water supply target through the mixed hot water path 27 and the control valve 28. When hot water supply is no longer necessary and the hot water supply indicator 31 is turned off, the drive of the drive device 24 is first stopped in conjunction with this, and the valve position of the mixing valve 19 is set to the mixing ratio at which the temperature set just before the stop was obtained. Fixed. Then, the control valve 28 operates to stop hot water supply. When the hot water supply indicator 31 gives an instruction to stop the hot water supply, the control valve 28 is closed to stop the hot water supply after stopping the drive device 24 of the mixing valve 19, so that the flow rate is reduced when the hot water supply is stopped. Controllable hunting due to delay in reaching the mixed hot water temperature detector 20 and uneven mixing can be prevented. Further, when the flow rate is low, the hot and cold water is not sufficiently mixed and causes a non-uniform flow. For example, when the water around the mixed hot water temperature detector 20 becomes predominant, the water is squeezed though the average mixing temperature is good. It is possible to prevent the average temperature of the mixed hot water from being raised by operating the mixing valve 19 in the direction of increasing the hot water. In this way, when the hot water supply is stopped, the mixed hot water greatly different from the set temperature is mixed hot water passage 27.
There is no problem of water being accumulated inside and being supplied when hot water is re-extracted.
When hot water supply is restarted, the control valve 28 is opened immediately when the hot water supply indicator 31 is turned on, and the drive device also starts to drive. However, like the conventional hot and cold water mixing device, the position of the mixing valve 19 is the same as in the previous use. The position is largely different from the position, and the operation of closing the water side and opening the hot water side during the stop is not performed, so that the supply of hot water is prevented and overshoot / undershoot is reduced.

As described above, in this embodiment, electrically supplying the mixed hot water
Since the hot water supply start / stop and the drive of the drive device 24 are started / stopped by the signal of the hot water supply indicator 31, the control valve 28 for stopping the hot water supply is eliminated, so that a heavy manual operation of the hot water supply tap can be eliminated. In addition, it does not require any means such as a special switch for detecting the start / stop of hot water supply. When the hot water supply indicator 31 instructs to stop the hot water supply, first, the mixing valve 19
Since the hot water supply is stopped by closing the control valve 28 after stopping the driving device 24 of the above, mixing unevenness that occurs as the flow rate decreases when the hot water supply is stopped, and the arrival of the mixed hot water to the mixed hot water temperature detector 20 are delayed. , Due to the deviation of the temperature of the mixed hot water due to the temperature deviation from the average temperature due to the drift, hunting and mixed hot water greatly different from the set temperature are accumulated in the mixed hot water path 27,
The problem of being supplied when re-hot water does not occur.

Effects of the Invention As described above, the hot water mixing device of the present invention has the following effects.

(1) It is equipped with an electrically controlled control valve that supplies / stops the mixed hot water, and both the start / stop of the hot water supply and the stop of the drive of the drive device are performed by the signal of the hot water supply indicator. It is possible to eliminate the heavy manual operation of the stopper and to simplify the configuration because no special switch or the like for detecting the start / stop of hot water supply is required.

(2) When the hot water supply indicator instructs to stop the hot water supply, the control valve is closed after stopping the drive device of the mixing valve to stop the hot water supply. It is possible to solve various problems that occur in the process of the flow rate decreasing at the time of stopping.

That is, when the flow rate is low, the arrival of the mixed hot water to the mixed hot water temperature detector is delayed, and due to uneven mixing, control hunting occurs, and when the flow rate is low, the hot and cold water does not mix sufficiently, causing a drift. If, for example, the surroundings of the mixed hot water temperature detector are mainly composed of water, the average mixed temperature is good, but the mixing valve operates to squeeze the water to increase the amount of hot water, and the average mixed hot water temperature The problem of increasing the temperature can be solved, and there is no problem that the mixed hot water greatly different from the set temperature accumulates in the mixed hot water path and is supplied at the time of re-hot water supply.

[Brief description of drawings]

FIG. 1 is a configuration diagram including a partial cross-sectional view of a hot and cold water mixing device according to an embodiment of the present invention, FIG. 2 is a control block diagram of the same device, and FIG. 3 is a configuration diagram showing a conventional hot and cold water mixing device. is there. 19 ... Mixing valve, 20 ... Mixing water temperature detector, 24 ... Driving device, 28 ... Control valve, 30 ... Mixing water temperature setting device, 3
1 ... Hot water supply indicator, 32 ... Controller, 33 ... Comparison unit,
34 ... Control part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Ueki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-59-126180 (JP, A)

Claims (1)

[Claims] 1. A mixing valve for adjusting the mixing ratio of hot water and water, a drive device for driving the mixing valve, a mixed hot water temperature detector for detecting the mixed hot water temperature, and a mixed hot water temperature for setting the mixed hot water temperature. Setting device, electrically controlled control valve for supplying / stopping the mixed hot water, hot water supply indicator for simultaneously receiving start / stop signal of hot water supply and start / stop signal of the drive device, and mixed hot water temperature setting The signal of the water heater and the mixed hot water temperature detector is compared to control the drive of the drive unit to adjust the mixing ratio, and the signal of the hot water supply indicator opens / closes the control valve to supply / stop the mixed hot water. And a hot water supply device comprising a controller for stopping hot water supply by stopping the drive device of the mixing valve and then closing the control valve when the hot water supply indicator instructs to stop hot water supply.