JPH08227323A - Water/hot water mixing device - Google Patents

Abstract

PURPOSE: To prevent the occurrence of overshooting and undershooting of the temperature of mixed hot water due to the variation in feeding pressure with simple constitution by arranging a pressure variation detecting means on the upstream side of a mixing valve. CONSTITUTION: The pressure variation detecting means 25 is fixed to a water feeding pipe 22 on the upstream side of the mixing valve 21 to detect variation in the pressure of fed water. The mixing valve 21 is driven by a mixing valve driving means 23 to change a mixing rate of hot water and water. When the pressure of fed water is changed due to the opening/closing or the like of another neighboring water valve in a state that the temperature of mixed hot water reaches a set temperature, the variation of water pressure is detected by the means 25 fixed to the water feeding pipe 22 and a pressure variation excitation quantity correcting means 30 outputs the excitation quantity of the valve 21 to a mixing valve control means 29 in accordance with the detected pressure variation output signal, to drive the means 23. The valve 21 is driven by the means 23 to correct the mixing rate of hot water and water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing apparatus capable of supplying hot water at a proper temperature by mixing hot water and water.

[0002]

2. Description of the Related Art A conventional hot and cold water mixing apparatus of this type (for example, Japanese Patent Publication No. 5-84332) is shown in FIG. In the figure, 1 is a water heater that starts and stops combustion according to the amount of water flow, 2 is a mixing valve, and 3 is a flow control valve. Hot water inflow path 4
The hot water and the water that have respectively flowed in from the water inflow path 5 and the water inflow path 5 are equalized in the pressure of the hot water and the water by the equalization valve 6 and are guided to the mixing valve 2. The mixing valve 2 is a drive unit 11 in which a mixing ratio variable portion including a hot water valve body 7 and a water side valve body 8 is provided outside via a shaft 10.
Driven by, and the mixing ratio of hot water and water is adjusted. The controller 14 controls the mixing valve 2 so that the mixed hot water temperature detected by the mixed hot water temperature sensor 12 becomes the set hot water temperature set by the setting device 13. The mixed hot water reaches the flow rate control valve 3 via the flow rate sensor 15. The flow rate control valve 3 includes a flow rate control valve valve body 16
And a drive device 17 for driving the flow rate control valve body 16, and is controlled by the controller 14 so that the set flow rate set by the setter 13 and the mixed hot water flow rate detected by the flow rate sensor 15 match. Then, the mixed hot water having the adjusted hot water temperature and flow rate is supplied from the outlet 18 to the hot water supply target.

Further, since the equalizing valve 6 is provided upstream of the mixing valve 2, even if the hot water supply pressure and the water supply pressure fluctuate or there is an imbalance, the equalizing valve 6 is It operates automatically in response to the supply pressure difference between the hot water and the water, and hot water and water of equal pressure are supplied to the hot water valve body 7 and the hot water valve body 8. Therefore,
A mixing ratio corresponding to the valve opening of each of the hot water valve body 7 and the water side valve body 8 can be obtained, so that the mixing temperature can be easily controlled and the temperature fluctuation at the time of water pressure fluctuation can be suppressed.

[0004]

However, in the conventional hot and cold water mixing apparatus as described above, the equalizing valve 6 acts so as to equalize the supply pressure on the hot water side and the supply pressure on the water side, whichever is lower. However, there is a problem that a sufficient flow rate cannot be obtained when the supply pressure on one side is low. For example, the water inflow path 5
Even if the pressure is 300 kilopascals, if the water heater 1 is an electric water heater and the pressure of the hot water inflow path 4 is 80 kilopascals,
For both the hot water valve body 7 and the water valve body 8 of the mixing valve 2,
Since a pressure of 80 kPa or more is not supplied, only a flow rate of 80 kPa of water pressure flows. Therefore,
There was a problem that the mixing valve 2 and the flow rate control valve 3 downstream of the equalization valve 6 had to be increased in size so as to reduce the pressure loss as much as possible.

Further, by providing the equalizing valve 6, there is a problem that the structure becomes complicated and the cost is high.

However, if the equalizing valve 6 is simply eliminated and the difference between the mixed hot water temperature and the set hot water temperature is detected and the valve opening of the mixed valve 2 is adjusted, the mixed valve 10 is driven. Control delay occurs until the hot water outlet temperature greatly exceeds the set hot water temperature or undershoots significantly below the set hot water temperature. Especially with regard to overshoot, there is a possibility that hot water is discharged and the risk increases.

The present invention is to solve the above problems,
(EN) It is possible to provide a hot water / water mixing device that is small in size and that enables a sufficient flow rate by suppressing overshoot and undershoot of the mixed hot water temperature when the supply pressure changes without requiring an equalization valve. It has one purpose.

A second object of the present invention is to provide a hot and cold water mixing apparatus which reasonably detects the fluctuation amount of the supply pressure by a piezoelectric body and has a simple structure and which is small in size and allows a sufficient flow rate.

A third object is to provide a hot and cold water mixing device which detects a fluctuation amount of a supply pressure by a polymeric piezoelectric material which is strong against impact and does not have a risk of cracking, has a simple structure, and is small in size and allows a sufficient flow rate. To do.

A fourth object is to detect the fluctuation amount of the supply pressure by means of a pressure fluctuation detecting means using a cylindrical piezoelectric body which can be easily sealed and is free from the risk of intrusion of hot and cold water. It is to provide a hot and cold water mixing device that enables a flow rate.

A fifth object of the present invention is to provide a hot and cold water mixing apparatus which is simple in structure, detects pressure fluctuations on the water side, and has a simple structure and is capable of achieving a sufficient flow rate.

[0012]

In order to achieve the first object, a hot and cold water mixing apparatus of the present invention comprises a mixing valve for adjusting the mixing ratio of hot water and water, and mixing valve driving means for driving the mixing valve. A mixing valve control means for controlling the driving of the mixing valve drive means, a pressure fluctuation detection means provided on the upstream side of the mixing valve, and a hot water temperature detection means provided on the downstream side of the mixing valve, Hot water temperature setting means for setting the mixed hot water temperature, deviation detecting means for detecting a deviation between the set hot water temperature set by the hot water temperature setting means and the mixed hot water temperature detected by the hot water temperature detecting means, and the deviation detecting means The mixing valve urging amount setting means for calculating the urging amount of the mixing valve according to the detected deviation and outputting it to the mixing valve control means, and the mixing signal responsive to the output signal from the pressure fluctuation detecting means. The pressure change that outputs the valve energizing amount to the mixing valve control means. It is provided with a time urging amount correcting means.

In order to achieve the second object, the hot and cold water mixing apparatus of the present invention comprises a mixing valve for adjusting the mixing ratio of hot water and water,
Mixing valve driving means for driving the mixing valve, mixing valve control means for controlling the driving of the mixing valve driving means, pressure fluctuation detection means formed of a piezoelectric body provided upstream of the mixing valve, Hot water temperature detection means provided on the downstream side of the mixing valve,
Hot water temperature setting means for setting the mixed hot water temperature, deviation detecting means for detecting a deviation between the set hot water temperature set by the hot water temperature setting means and the mixed hot water temperature detected by the hot water temperature detecting means, and the deviation detecting means The mixing valve urging amount setting means for calculating the urging amount of the mixing valve according to the detected deviation and outputting it to the mixing valve control means, and the mixing signal responsive to the output signal from the pressure fluctuation detecting means. There is provided a pressure fluctuation urging amount correcting means for outputting the urging amount of the valve to the mixing valve control means.

In order to achieve the third object, the hot and cold water mixing apparatus of the present invention comprises a mixing valve for adjusting the mixing ratio of hot water and water.
Mixing valve drive means for driving the mixing valve, mixing valve control means for controlling the driving of the mixing valve drive means, and pressure fluctuation detection means using a polymeric piezoelectric material provided upstream of the mixing valve. The hot water temperature detecting means provided on the downstream side of the mixing valve, the hot water temperature setting means for setting the hot water temperature of the mixture, the set temperature set by the hot water temperature setting means and the hot water temperature detecting means. Deviation detecting means for detecting a deviation of the mixed hot water temperature, and mixing valve energizing amount setting means for calculating an energizing amount of the mixing valve in accordance with the deviation detected by the deviation detecting means and outputting it to the mixing valve control means. And a pressure fluctuation urging amount correcting means for outputting the urging amount of the mixing valve to the mixing valve control means in accordance with the output signal from the pressure fluctuation detecting means.

In order to achieve the fourth object, the hot and cold water mixing apparatus of the present invention comprises a mixing valve for adjusting the mixing ratio of hot water and water.
Mixing valve driving means for driving the mixing valve, mixing valve control means for controlling the driving of the mixing valve driving means, and pressure fluctuation detecting means using a cylindrical piezoelectric body provided on the upstream side of the mixing valve. A hot water temperature detecting means provided on the downstream side of the mixing valve, a hot water temperature setting means for setting a hot water temperature for mixing, a set temperature set by the hot water temperature setting means and the hot water temperature detecting means. Deviation detecting means for detecting the deviation of the mixed hot water temperature, and a mixing valve energizing amount setting for calculating the energizing amount of the mixing valve in accordance with the deviation detected by the deviation detecting means and outputting it to the mixing valve control means. And a biasing amount correction unit at the time of pressure fluctuation for outputting the biasing amount of the mixing valve to the mixing valve control unit according to the output signal from the pressure fluctuation detecting unit.

In order to achieve the fifth object, the hot and cold water mixing apparatus of the present invention comprises a mixing valve for adjusting the mixing ratio of hot water and water.
Mixing valve driving means for driving the mixing valve, mixing valve control means for controlling driving of the mixing valve driving means, and pressure fluctuation detecting means made of a piezoelectric material provided upstream of the mixing valve on the water side, Hot water temperature detection means provided on the downstream side of the mixing valve, hot water temperature setting means for setting the mixed hot water temperature, set temperature set by the hot water temperature setting means and mixing detected by the hot water temperature detection means Deviation detecting means for detecting deviation of hot water temperature, and mixing valve energizing amount setting means for calculating an energizing amount of the mixing valve according to the deviation detected by the deviation detecting means and outputting to the mixing valve control means. A pressure fluctuation urging amount correcting means for outputting the urging amount of the mixing valve to the mixing valve control means in response to an output signal from the pressure fluctuation detecting means is provided.

[0017]

The hot and cold water mixing apparatus of the present invention has the above-described structure.
By predicting the hot water temperature deviation that occurs according to the output signal from the pressure fluctuation detection means provided upstream of the mixing valve, and driving the mixing valve based on the predicted deviation before the hot water temperature deviation is detected. The purpose is to prevent overshoot and undershoot of the mixed hot water temperature due to fluctuations in the supply pressure.

Further, the hot and cold water mixing apparatus of the present invention has the above-mentioned structure, and predicts the hot water temperature deviation which occurs in accordance with the output signal from the pressure fluctuation detecting means formed of a piezoelectric element provided on the upstream side of the mixing valve, By driving the mixing valve based on the predicted deviation before the hot water temperature deviation is detected, the overshoot and undershoot of the mixed hot water temperature due to the supply pressure fluctuation are prevented.

The hot and cold water mixing apparatus of the present invention has the above-described structure, and predicts the hot water temperature deviation that occurs in accordance with the output signal from the pressure fluctuation detection means using the polymeric piezoelectric material provided upstream of the mixing valve. However, by driving the mixing valve based on the predicted deviation before the hot water temperature deviation is detected, the overshoot and undershoot of the mixed hot water temperature due to the supply pressure fluctuation are prevented.

Further, the hot and cold water mixing apparatus of the present invention has the above-mentioned configuration, and causes a hot water temperature deviation which occurs in accordance with the output signal from the pressure fluctuation detecting means using the cylindrical piezoelectric element provided on the upstream side of the mixing valve. By predicting and driving the mixing valve based on the predicted deviation before the deviation of the hot water temperature is detected, overshoot and undershoot of the mixed hot water temperature due to fluctuations in the supply pressure are prevented.

Further, the hot and cold water mixing apparatus of the present invention is configured as described above, and predicts the hot water temperature deviation that occurs in accordance with the output signal from the pressure fluctuation detecting means made of a piezoelectric material provided upstream of the mixing valve on the water side. By driving the mixing valve based on the predicted deviation before the hot water temperature deviation is detected, it is possible to prevent overshoot and undershoot of the mixed hot water temperature due to the supply pressure fluctuation.

[0022]

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

FIG. 1 is a block diagram showing a first embodiment of the present invention. In FIG. 1, reference numeral 20 denotes a hot water supply pipe for supplying hot water, and the hot water supply pipe 20 communicates with a mixing valve 21. Hot water and water are supplied to the mixing valve 21 from a hot water supply pipe 20 and a water supply pipe 22, respectively. The mixing valve 21 is a stepping motor 23 that is a mixing valve driving means provided outside the mixing valve 21.
Driven by, the mixing ratio of hot water and water is adjusted. Reference numeral 24 denotes a hot water temperature detecting means which is provided on the downstream side of the mixing valve 21 and detects the hot water temperature of the mixed water. Reference numeral 25 is a pressure fluctuation detecting means which is provided in the water supply pipe 22 on the upstream side of the mixing valve 21 and detects a pressure fluctuation of the supply water.

Reference numeral 26 is a hot water temperature setting means for setting the hot water temperature desired by the user, and 27 is set by the hot water temperature setting means 26 and the mixed hot water temperature T detected by the hot water temperature detecting means 24. It is a deviation detecting means for detecting the deviation ΔT of the set temperature Ts. The mixing valve energizing amount setting means 28 is the deviation detecting means 27.
The urging amount of the mixing valve is calculated and set on the basis of the detected deviation, and the urging amount of the mixing valve is output to the mixing valve control unit 29 which controls the driving of the mixing valve driving unit (stepping motor) 23. Reference numeral 30 is a pressure fluctuation urging amount correcting means for outputting the urging amount of the mixing valve 21 to the mixing valve control means 29 in response to the output signal from the pressure fluctuation detecting means 25.

The operation of this embodiment having the above configuration will be described. During hot water discharge, the mixed hot water temperature is detected by the hot water temperature detecting means 24, and the deviation detecting means 27 obtains the deviation ΔT from the set temperature Ts set by the hot water temperature setting means 26. The mixing valve energizing amount setting means 28 sets the energizing amount of the mixing valve 21 based on the deviation ΔT obtained by the deviation detecting means 27, and outputs the energizing amount to the mixing valve control means 29. The mixing valve control means 29 drives the mixing valve drive means 23 according to the urging amount set by the mixing valve urging amount setting means 28. The mixing valve 20 is driven by the mixing valve drive means 23 to change the mixing ratio of hot water and water. In this way, feedback control is performed so that the mixed hot water temperature becomes the set temperature. Then, when the supply water pressure fluctuates due to the opening and closing of another faucet in the state where the mixed hot water temperature is at the set temperature, the water pressure fluctuation is detected by the pressure fluctuation detection provided in the water supply pipe 22. According to the output signal of the pressure fluctuation detected by the means 25, the pressure fluctuation time biasing amount correcting means 30 controls the biasing amount of the mixing valve 21 to the mixing valve control means 2.
9 to drive the mixing valve drive means 23. Mixing valve 2
0 is driven by the mixing valve drive means 23 to correct the mixing ratio of hot water and water.

That is, the mixing ratio of hot water and water is corrected by a signal from the pressure fluctuation detecting means 25 prior to the feedback control by the hot water temperature detecting means 24.

Therefore, when the supply water pressure fluctuates, the mixing ratio of hot water and water is disturbed, and the mixed hot water temperature starts to deviate from the set hot water temperature. The mixing ratio of hot water and water is corrected, the mixed hot water temperature is prevented from largely deviating from the set hot water temperature, and a stable hot water temperature can be obtained even if the water pressure changes.

That is, the hot water temperature deviation that occurs is predicted according to the output signal from the pressure fluctuation detecting means 25 provided upstream of the mixing valve 21, and based on the predicted deviation before the hot water temperature deviation is detected. By driving the mixing valve 21, it is possible to prevent overshoot and undershoot of the temperature of the mixed hot water due to fluctuations in the supply pressure.

As described above, according to this embodiment, the pressure equalization valve 6 which has a complicated structure as in the prior art and is arranged to the one where the supply pressure of hot water and water is low is not required, and the supply pressure can be changed with a simple structure. A hot and cold water mixing device that suppresses overshoot and undershoot of the mixed hot water temperature at a time and is small in size and allows a sufficient flow rate is obtained.

FIG. 2 is a constitutional view of a hot and cold water mixing apparatus showing a second embodiment of the present invention. The difference from the constitution of the hot and cold water mixing apparatus of FIG. 1 is that the pressure fluctuation detecting means 25 is formed of a piezoelectric material. It is configured by the fluctuation detecting means 31. In FIG.
Pressure fluctuation detection means 31 provided upstream of the mixing valve 21
Is a thin plate-shaped piezoelectric body, which receives the supply water pressure supplied to the water supply pipe 22 and causes a slight amount of distortion in the form of expanding outward. From this state, for example, when a nearby water faucet is suddenly opened, the supply water pressure of the water supply pipe 22 suddenly drops. Therefore, the stress strain of the piezoelectric body 31 also suddenly decreases. The piezoelectric body has a function of converting mechanical energy into electrical energy, and generates a voltage according to the amount of change in stress strain received. That is, the piezoelectric body 31 generates a voltage according to the change in the supplied water pressure, and the larger the changed amount of the supplied water pressure is, the larger the voltage signal is output to the urging amount correction means 30 during pressure fluctuation,
The mixed valve driving means 23 is predictively driven before the mixed hot water temperature fluctuates or the hot water temperature detecting means 24 performs detection feedback to the deviation detecting means 27. That is, the hot water temperature deviation that occurs is predicted in accordance with the output signal of the pressure fluctuation detection means 31 made of a piezoelectric material, and the mixing valve 21 is driven based on the predicted deviation before the hot water temperature deviation is detected. Overshoot and undershoot of the mixed hot water temperature due to pressure fluctuations are prevented. Contrary to the previous example, when the supply water pressure of the water supply pipe 22 suddenly rises due to a sudden closing of a nearby water faucet, a voltage fluctuation in the reverse direction when the water pressure decreases is detected. The means 31 is generated to drive the mixing valve driving means 23 in the opposite direction to the above, and similarly, the overshoot and undershoot of the mixed hot water temperature due to the fluctuation of the supply pressure are prevented.

As described above, according to this embodiment, since the pressure fluctuation detecting means 31 is composed of the piezoelectric material, the fluctuation of the supply water pressure is simple and the voltage signal changes according to the degree of fluctuation. Since it can be obtained without delay time in synchronization with
It is possible to prevent fluctuations in the hot water temperature, such as overshoot, due to the delay time of the feedback control by the hot water temperature detecting means 24.

FIG. 3 is a block diagram of a hot and cold water mixing apparatus showing a third embodiment of the present invention. The difference from the configuration of the hot and cold water mixing apparatus of FIG. 2 is that the pressure fluctuation detecting means 31 is made of a polymeric piezoelectric material. The pressure fluctuation detecting means 32 is included. In FIG. 3, the pressure fluctuation detecting means 32 provided on the upstream side of the mixing valve 21 is a film-shaped piezoelectric body made of a polymeric piezoelectric material, and receives a supply water pressure supplied to the water supply pipe 22, and slightly There is a distortion that bulges outward. From this state, for example, when a nearby water faucet is suddenly opened, the supply water pressure of the water supply pipe 22 suddenly drops. Therefore, the stress strain of the piezoelectric body 32 also suddenly decreases. The piezoelectric body has a function of converting mechanical energy into electrical energy, and generates a voltage according to the amount of change in stress strain received. That is, the piezoelectric body 32 generates a voltage according to the change in the supplied water pressure, and the larger the changed amount of the supplied water pressure is, the larger the voltage signal is output to the urging amount correction means 30 at the time of pressure fluctuation, and the mixed hot water temperature is changed. The mixing valve drive means 23 is predictively driven before the boiling water temperature detection means 24 performs detection feedback to the deviation detection means 27. That is, by predicting the hot water temperature deviation that occurs in accordance with the output signal of the pressure fluctuation detection means 32 made of a polymeric piezoelectric material, and driving the mixing valve 21 based on the predicted deviation before the hot water temperature deviation is detected. The overshoot and undershoot of the temperature of the mixed hot water due to the fluctuation of the supply pressure are prevented. Contrary to the previous example, when the supply water pressure of the water supply pipe 22 suddenly rises due to a sudden closing of a nearby water faucet, a voltage fluctuation in the reverse direction when the water pressure decreases is detected. Means 32 is generated to drive the mixing valve driving means 23 in the opposite direction to the above,
Similarly, overshoot and undershoot of the mixed hot water temperature due to fluctuations in the supply pressure are prevented.

As described above, according to the present embodiment, the pressure fluctuation detecting means 32 is composed of the polymer piezoelectric material, so that the fluctuation of the supply water pressure can be made simple and the voltage signal according to the degree of fluctuation can be obtained. Can be obtained in synchronism with the fluctuation without delay time, so that fluctuation of the hot water temperature such as overshoot due to delay time of the feedback control by the hot water temperature detecting means 24 can be prevented in advance. Moreover, since the pressure fluctuation detecting means 32 is made of a polymer piezoelectric material, there is no need to worry about cracking due to being hard and brittle like a ceramic piezoelectric material, or to provide a special waterproofing structure such as covering with a waterproof film. , Flexibility
Since it has water resistance and, in addition, it has a low dielectric constant, high voltage sensitivity can be obtained. With a simple structure, it is possible to detect fluctuations in the supplied water pressure and obtain unique effects such as high practical reliability.

FIG. 4 is a block diagram of a hot and cold water mixing apparatus showing a fourth embodiment of the present invention. The difference from the configuration of the hot and cold water mixing apparatus of FIG. 2 is that the pressure fluctuation detecting means 31 is a cylindrical piezoelectric body. It is configured by the pressure fluctuation detecting means 33 used. FIG.
In the above, the pressure fluctuation detecting means 33 provided on the upstream side of the mixing valve 21 includes a core wire 35 on the inside and a copper wire on the outside of a cylindrical piezoelectric body 34 made of a polymer piezoelectric material which is a polyvinylidene fluoride-based copolymer. A cable-like structure in which a shield 36 is provided and an outer side thereof is covered with a polymer coating 37, the supply water pressure supplied to the water supply pipe 22 is received from the surroundings, and a compressive strain is generated. From this state, for example, when a nearby water faucet is suddenly opened, the supply water pressure of the water supply pipe 22 suddenly drops. Therefore, the stress strain of the cylindrical piezoelectric body 34 also suddenly decreases. The piezoelectric body has a function of converting mechanical energy into electrical energy, and generates a voltage according to the amount of change in stress strain received. That is, the piezoelectric body 34 generates a voltage according to the change of the supply water pressure, and the larger the change amount of the supply water pressure is, the larger the voltage signal is.
0, the mixed hot water temperature fluctuates, and the mixed hot water temperature detection means 24 predictively drives the mixed valve driving means 23 prior to detection feedback to the deviation detection means 27. That is, the hot water temperature deviation that occurs is predicted according to the output signal of the pressure fluctuation detection means 33 that is formed by the cylindrical piezoelectric body 34, and the mixing valve 21 is driven based on the predicted deviation before the hot water temperature deviation is detected. As a result, overshoot and undershoot of the mixed hot water temperature due to fluctuations in the supply pressure are prevented. Contrary to the previous example,
The water tap 22
When the water pressure of the supply suddenly rises, the pressure fluctuation detecting means 33 generates a voltage signal in the opposite direction when the water pressure decreases,
The mixing valve driving means 23 is driven in the opposite direction to the above, and similarly, the overshoot and undershoot of the mixed hot water temperature due to the supply pressure fluctuation are prevented.

As described above, according to the present embodiment, since the pressure fluctuation detecting means 33 is constituted by the cylindrical piezoelectric body 34, the fluctuation of the supply water pressure is simple and can be adjusted according to the degree of fluctuation. Since the voltage signal is obtained without delay time in synchronization with the fluctuation, it is possible to prevent fluctuation of the hot water temperature such as overshoot due to delay time of the feedback control by the hot water temperature detecting means 24. Moreover, since the pressure fluctuation detecting means 33 is constituted by the cylindrical piezoelectric body 34, the water supply pipe 22 can be penetrated as shown in FIG. 4 and can be easily sealed with O-rings 38, 39, etc., and the pressure loss of the flow path is small and small. A hot and cold water mixing apparatus that enables a sufficient flow rate can be obtained.

Further, as shown in FIGS. 2, 3 and 4, the point of the fifth embodiment of the present invention is that the pressure fluctuation detecting means 31, 32 and 33 made of a piezoelectric material are connected to the water of the mixing valve 21. It is located on the upstream side. Generally, when comparing the water pressures of the hot water supply pipe 20 and the water supply pipe 22, the pressure on the water side is high and the pressure on the hot water side is low. This is because the hot water is supplied through the water heater and the pressure is reduced by the water heater. Therefore, the absolute value of the supply pressure is higher on the water side, and the pressure fluctuation range is also larger on the water side. Therefore, as in the present embodiment, a pressure fluctuation detecting means is provided on the water side upstream 22 of the mixing valve 21, which is the side on which the pressure fluctuation is large, and the generated hot water temperature deviation is predicted according to the output signal from the pressure fluctuation detecting means. However, by driving the mixing valve based on the predicted deviation before the deviation of the hot water temperature is detected, it is possible to provide a hot and cold water mixing apparatus with less overshoot and undershoot of the mixed hot water temperature due to fluctuations in the supply pressure.

[0037]

As described above in detail, the hot and cold water mixing apparatus of the present invention is provided with the pressure fluctuation detecting means on the upstream side of the mixing valve, so that the hot water temperature detecting means causes the hot water temperature deviation in accordance with the output signal thereof. The mixing valve is driven before it is detected, and there is no need for an equalizing valve that has a complicated structure as in the past and that adjusts the supply pressure of hot water and water to a lower one. It is possible to prevent the overshoot and the undershoot of. In addition, a compact hot-water mixing device with small pressure loss can be obtained.

Further, the hot and cold water mixing apparatus of the present invention is provided with the pressure fluctuation detecting means composed of a piezoelectric element on the upstream side of the mixing valve, so that the fluctuation of the supply water pressure is simple and can be adjusted according to the degree of fluctuation. Since the voltage signal obtained is synchronized with the fluctuations and has no delay time, it is possible to prevent fluctuations in the hot water temperature such as overshoot due to the delay time of the feedback control by the hot water temperature detecting means.

Further, the hot and cold water mixing apparatus of the present invention is provided with the pressure fluctuation detecting means using the polymeric piezoelectric material on the upstream side of the mixing valve, so that the fluctuation of the supply water pressure is simple and
Since the voltage signal according to the degree of fluctuation is obtained in synchronization with the fluctuation without delay time, it is possible to prevent fluctuation in hot water temperature such as overshoot due to delay time of feedback control by the hot water temperature detecting means. Moreover, since the pressure fluctuation detecting means is composed of a polymeric piezoelectric material, there is no need to worry about cracking due to being hard and brittle like a ceramic piezoelectric material, or to provide a special waterproofing structure such as covering with a waterproof film.
Since it has flexibility and water resistance, and has a low dielectric constant, high voltage sensitivity can be obtained. With a simple structure, it is possible to detect fluctuations in the supplied water pressure and obtain unique effects such as high practical reliability.

Further, in the hot and cold water mixing apparatus of the present invention, by providing the pressure fluctuation detecting means using the cylindrical piezoelectric body on the upstream side of the mixing valve, the fluctuation of the supplied water pressure can be made simple and Since the voltage signal according to the degree is obtained without delay time in synchronization with the fluctuation, it is possible to prevent fluctuation of the hot water temperature such as overshoot due to the delay time of the feedback control by the hot water temperature detecting means. Moreover, since the pressure fluctuation detecting means is composed of a piezoelectric body having a cylindrical shape, it is possible to penetrate the water supply pipe and easily seal it with an O-ring, etc. can get.

Further, the hot and cold water mixing apparatus of the present invention is provided with the pressure fluctuation detecting means made of a piezoelectric material on the water side upstream of the mixing valve, so that the pressure fluctuation on the water side having a large fluctuation range is simple and Therefore, it is possible to provide the effect of being able to provide a hot and cold water mixing apparatus which is small and enables a sufficient flow rate.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a hot and cold water mixing apparatus showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a hot and cold water mixing apparatus showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a hot and cold water mixing apparatus showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a hot and cold water mixing apparatus showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a conventional hot and cold water mixing device.

[Explanation of symbols]

 21 Mixing valve 23 Stepping motor (mixing valve driving means) 24 Hot water temperature detecting means 25 Pressure fluctuation detecting means 26 Hot water temperature setting means 27 Deviation detecting means 28 Mixing valve energizing amount setting means 29 Mixing valve control means 30 Energizing during pressure fluctuation Quantity setting means 31 Piezoelectric body 32 Polymer piezoelectric material 33 Pressure fluctuation detecting means 34 Cylindrical piezoelectric body

Claims (5)

[Claims] 1. A mixing valve for adjusting a mixing ratio of hot water and water, a mixing valve driving means for driving the mixing valve, a mixing valve control means for controlling driving of the mixing valve driving means, and a mixing valve for the mixing valve. A pressure fluctuation detecting means provided on the upstream side for detecting fluctuations in at least hot water or water supply pressure, a hot water temperature detecting means provided on the downstream side of the mixing valve, and a hot water temperature setting means for setting a mixed hot water temperature, Deviation detecting means for detecting a deviation between the set temperature set by the hot water temperature setting means and the mixed hot water temperature detected by the hot water temperature detecting means, and the mixing valve attached according to the deviation detected by the deviation detecting means. A mixing valve energizing amount setting means for calculating an energizing amount and outputting it to the mixing valve controlling means, and an energizing amount of the mixing valve to the mixing valve controlling means according to an output signal from the pressure fluctuation detecting means. Hot water provided with an urging amount correction means for output pressure fluctuations Mixing device. 2. A mixing valve for adjusting a mixing ratio of hot water and water, a mixing valve driving means for driving the mixing valve, a mixing valve control means for controlling driving of the mixing valve driving means, and a mixing valve for the mixing valve. A pressure fluctuation detecting means formed of a piezoelectric body provided on the upstream side,
Hot water temperature detection means provided on the downstream side of the mixing valve, hot water temperature setting means for setting the mixed hot water temperature, set temperature set by the hot water temperature setting means and mixing detected by the hot water temperature detection means Deviation detecting means for detecting deviation of hot water temperature, and mixing valve energizing amount setting means for calculating an energizing amount of the mixing valve according to the deviation detected by the deviation detecting means and outputting to the mixing valve control means. A hot and cold water mixing apparatus comprising: a pressure fluctuation urging amount correcting means for outputting the urging amount of the mixing valve to the mixing valve control means in accordance with an output signal from the pressure fluctuation detecting means. 3. A mixing valve for adjusting a mixing ratio of hot water and water, a mixing valve driving means for driving the mixing valve, a mixing valve control means for controlling driving of the mixing valve driving means, and a mixing valve for the mixing valve. Pressure fluctuation detection means using a polymer piezoelectric material provided on the upstream side, hot water temperature detection means provided on the downstream side of the mixing valve, hot water temperature setting means for setting the hot water temperature, and hot water temperature Deviation detecting means for detecting a deviation between the set temperature set by the setting means and the mixed hot water temperature detected by the hot water temperature detecting means, and an urging amount of the mixing valve according to the deviation detected by the deviation detecting means. A mixing valve bias amount setting means for calculating and outputting to the mixing valve control means, and a pressure for outputting the bias amount of the mixing valve to the mixing valve control means in accordance with an output signal from the pressure fluctuation detection means. A hot and cold water mixing device comprising a biasing amount correction means during fluctuation. 4. A mixing valve for adjusting a mixing ratio of hot water and water, a mixing valve driving means for driving the mixing valve, a mixing valve control means for controlling driving of the mixing valve driving means, and a mixing valve of the mixing valve. Pressure fluctuation detection means using a cylindrical piezoelectric body provided on the upstream side, hot water temperature detection means provided on the downstream side of the mixing valve, hot water temperature setting means for setting the hot water temperature, and the hot water Deviation detecting means for detecting a deviation between the set temperature set by the temperature setting means and the mixed hot water temperature detected by the hot water temperature detecting means, and the urging amount of the mixing valve according to the deviation detected by the deviation detecting means And outputs the biasing amount of the mixing valve to the mixing valve control means in accordance with an output signal from the mixing valve biasing amount setting means for outputting to the mixing valve control means and the pressure fluctuation detecting means. A hot and cold water mixing device comprising a biasing amount correction means at the time of pressure fluctuation. 5. A mixing valve for adjusting a mixing ratio of hot water and water, a mixing valve driving means for driving the mixing valve, a mixing valve control means for controlling driving of the mixing valve driving means, and a mixing valve for the mixing valve. A pressure fluctuation detecting means made of a piezoelectric material provided upstream of the water side, and a hot water temperature detecting means provided downstream of the mixing valve,
Hot water temperature setting means for setting the mixed hot water temperature, deviation detecting means for detecting a deviation between the set hot water temperature set by the hot water temperature setting means and the mixed hot water temperature detected by the hot water temperature detecting means, and the deviation detecting means The mixing valve urging amount setting means for calculating the urging amount of the mixing valve according to the detected deviation and outputting it to the mixing valve control means, and the mixing signal responsive to the output signal from the pressure fluctuation detecting means. A hot and cold water mixing device comprising: a pressure fluctuation urging amount correcting means for outputting a valve urging amount to the mixing valve control means.