JP2543037B2 - 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 supplying hot water by mixing hot water and water to obtain an appropriate temperature.

2. Description of the Related Art Conventionally, there has been a hot water mixing apparatus of this kind as shown in FIG. (For example, Japanese Utility Model Laid-Open No. 55-59223) In FIG. 2, a hot water side valve body 5 and a water are provided inside a valve frame body 4 having a hot water inlet 1, a water inlet 2 and a mixed hot water outlet 3. A side valve body 6 is provided. The hot water side valve element 5 and the water side valve element 6 are mounted on a shaft 7 and driven by a motor 10 via a linear motion conversion mechanism 8 and a gear 9 provided outside. A mixed hot water temperature detector 11 for detecting the mixed hot water temperature is provided in the vicinity of the mixed hot water outlet 3.
The controller 13 compares the mixed hot water temperature value set by the mixed hot water temperature setting device 12 with the hot water temperature value detected by the mixed hot water temperature detector 11, and controls the motor 10. The terminal is provided with a faucet 14 for supplying mixed hot water. Then, open the faucet 14 and manually operate the mixed hot water temperature setting device 12 to set the mixed hot water temperature.
The controller 13 compares the value of the mixed hot water temperature detector 11 with the set value of the mixed hot water temperature setter 12, and the motor 10 is drive-controlled so as to eliminate the temperature deviation between the two.

Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) When the hot water pressure or water pressure changes abruptly due to the opening and closing of other hot water taps or hot water taps, the response delay of the mixed hot water temperature detector 11, the backlash of the linear motion conversion mechanism 9, and the delay in the controller 13 The control operation was delayed due to some factors, and transient overshooting and undershooting of the mixed hot water temperature occurred.

(2) If the water pressure or the hot water pressure is high, the pressure applied to the hot water side valve element 5 or the water side valve element 6 becomes excessively large, and the motor 10 must also have a large capacity to counter this.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a hot and cold water mixing apparatus which reduces transient temperature fluctuations and requires less driving force.

Means for Solving the Problems In order to solve the above problems, the hot and cold water mixing apparatus of the present invention, the primary pressure of the hot water is balanced by the pressure balancing means and the secondary pressure is set by the pressure setting means, A hot water pressure regulating valve that reduces the primary pressure of hot water by means of a pressure regulating valve body connected to the pressure balancing means to keep the secondary pressure of the hot water substantially constant, and a pressure independent of the hot water pressure regulating valve with respect to the primary pressure of water. A water-side pressure regulating valve that balances by the balancing means and a secondary pressure is set by the pressure setting means, and reduces the primary pressure of water by the pressure regulating valve body connected to the pressure balancing means to keep the secondary pressure substantially constant. , Hot water mixing valve installed on the secondary side of the hot water pressure regulating valve and the water pressure regulating valve for mixing hot water and water, electric drive means for electrically driving this hot water mixing valve, and setting the mixed hot water temperature The mixed hot water temperature setting device and the electrically driven hand according to the setting of this mixed hot water temperature setting device. It is configured to include a controller that drives and controls the stages to adjust the mixing ratio of the hot and cold water mixing valve.

With the above-described structure, the present invention controls the electric drive means by the controller and drives the mixing valve by the electric drive means to obtain the mixed hot water temperature set by the mixed hot water temperature setting device. In addition to adjusting the mixing ratio, the hot water pressure control valve and the water pressure control valve provided independently on the hot water side and the hot water side reduce the hot water pressure and water pressure to obtain the secondary pressure set by each pressure setting means. This absorbs fluctuations in the primary pressure of the hot water and water and reduces the pressure of the hot water and water on the mixing valve to reduce the overshoot and undershoot of the mixed hot water temperature when the primary pressure fluctuates. In addition to reducing the load on the means, by not interlocking the adjustment of the secondary pressure on the hot water side and the secondary pressure on the water side, the secondary pressure is aligned with the lower pressure, and the mixture flow rate is prevented from being restricted. There is something.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, the primary pressure of hot water and water supplied through the hot water flow path 15 and the water flow path 16 is controlled by a hot water side pressure regulating valve 18 provided independently in the hot water side and the water side in the valve frame body 17. The pressure is regulated by the water side pressure regulating valve 19 so that the secondary pressure is kept substantially constant. Each of the hot water-side and water-side pressure regulating valves 18 and 19 is constituted by a pressure regulating valve body 20 and a cylinder 22 in which a piston 22 connected to the pressure regulating valve body 20 by a shaft 21 slides in a cylinder 23. The pressure regulating valve body 20 is provided with a packing 24, which abuts on the valve seat 25 when the flow is stopped to prevent backflow of hot water and water. A seal rubber 26 is attached to the piston 22 to prevent liquid leakage to the outside. The piston 22 is configured so that the adjustment of the secondary pressure can be changed by a spring 27 as a pressure setting means and an adjusting screw 28. As the pressure setting means, the adjusting screw 28 is eliminated and the spring 27
It may be set only by itself, or a means other than a spring that can apply pressure such as rubber may be used. Pressure regulating valve body 20 and piston
The pressure receiving areas of 22 are configured to be the same, the primary pressures applied to both are offset, and the secondary pressure is reduced to a value where the secondary pressure applied to the pressure regulating valve body 20 and the set load of the spring 27 are balanced. . A mixing valve 29 for mixing and mixing water is provided on the secondary side of the hot water pressure regulating valve 18 and the water pressure regulating valve 19. Mixing valve 29 is the hot side valve body
30 and the water side valve body 31, with both inner ends regulated by the shaft 32,
The hot water spring 33 and the water spring 34 urge the springs to adjust the distance between the hot water valve seat 35 and the hot water valve seat 36 in inverse proportion to adjust the mixing ratio of hot water. The shaft 32 is driven via a reduction gear 38 and a linear motion conversion mechanism 39 by a mixing valve motor 37 which is an electric drive means provided outside. The temperature of the mixed hot water is detected by the thermistor 40, and the flow rate is detected by the flow rate sensor 41. The flow sensor 41 is
A fixed impeller 42 that imparts rotation to the flow, a ball 43 that turns by the rotated flow, an outflow prevention receiver 44 that prevents the ball 43 from flowing out, and a magnetoresistive element 45 that detects the rotation of the ball 43.
Consists of The signals of the thermistor 40 and the flow rate sensor 41 are transmitted to the controller 46, and are compared with the set value of the setter 47 for setting and displaying the mixed hot water temperature, the mixed flow rate, the integrated value of the mixed flow rate, and the like. The controller 46 controls the flow control valve motor 49 that drives the mixing valve motor 37 and the flow control valve 48, and the display of the setting device 47. The mixed hot water is supplied from the faucet 51 to the hot water supply target through the mixed hot water flow path 50.

With the above-described configuration, when the desired hot water temperature, the mixed flow rate, and the integrated value of the mixed flow rate are set by the setting device 47 and the start of hot water supply is instructed, the flow rate control valve motor 49 first opens the flow rate control valve 48, And the flow of water is started. The primary pressure of hot water and water is
The hot water pressure regulating valve 18 and the water pressure regulating valve 19 reduce the pressure, and the secondary pressure is maintained at the set pressure. The mixing valve 29 is a thermistor 40.
The mixed hot water temperature detected at is compared with the mixed hot water temperature set value of the setting device 47 by the controller 46, and the mixing valve 29 is adjusted by the controller 46 via the mixing valve motor 37 to a mixing ratio that eliminates the temperature deviation between the two. To be done. Further, the detection signal of the flow rate sensor 41 and the set value of the setter 47 are compared by the controller 46, and the flow rate control valve 48 is adjusted via the flow rate control valve motor 49 to obtain a predetermined flow rate. The mixed hot water temperature detected by the thermistor 40 and the mixed flow rate detected by the flow rate sensor 41 are displayed on the setter 47 via the controller 46. If another tap or hot water tap is used and the primary pressure of the hot water changes, the hot water pressure regulating valve 18 or the water pressure regulating valve
19 immediately responds and maintains the secondary pressure of hot water or water at the set value. Therefore, there is almost no change in the hot water pressure and the water pressure applied to the mixing valve 29, and the overshoot and undershoot of the hot water mixing can be extremely small. Further, even if the primary pressure is large, the hot water pressure and the water pressure applied to the mixing valve 29 can be reduced by the depressurizing action of the hot water pressure regulating valve 18 and the water pressure regulating valve 19, so that the mixing valve motor 37 is driven. It requires less power. Further, if the secondary pressure is small, the resolution depending on the accuracy of the mixing valve 29, the mixing valve motor 37, and the controller 46 may be rough. When it is desired to stop the hot water supply, the flow rate control valve 48 closes the mixing flow path and stops the supply of the mixed hot water by instructing the setting device 47. When the hot water supply is stopped, the pressure regulating valve body 20 of the hot water regulating valve 18 and the water regulating valve 19 and the like come in contact with the valve seat 25 and the like to shut off the flow path, and the hot water / water or the mixed hot water flows backward when the water is cut off. Is being prevented.

The hot water side pressure regulating valve 18 and the water side pressure regulating valve 19 may have the same set secondary pressure or may have different set secondary pressures. When different, for example, when a low temperature of the mixed hot water is desired or when only water is desired to be discharged, a large amount of the low temperature mixed hot water or water can be obtained by setting the water pressure high. Further, when the hot water pressure is set to be high, a large amount of flow can be taken when hot or hot water is discharged. Since the hot water side pressure regulating valve 18 and the water side pressure regulating valve 19 are independently provided in this way, it occurs when using a pressure balance valve that makes the secondary pressure equal by linking the hot water side and the water side, one of which is When the pressure becomes low, the other is aligned with this, and it is possible to prevent the phenomenon that a large amount of mixed hot water cannot be supplied. This can be said even when the set secondary pressures of the hot water pressure regulating valve 18 and the water pressure regulating valve 19 are the same. For example, the set pressure on the hot water side and the hot water side is 1 kg /
Suppose you have set it to cm ² .

Assuming that the water pressure in the hot water flow path 15 is 1 kg / cm ² and the water pressure in the water flow path 16 is 2
If it is kg / cm ² , the ^secondary pressures of the hot water pressure regulation valve 18 and the water pressure regulation valve 19 are 1 kg / cm ² and 1 kg / cm ² , respectively, and the pressure that equalizes the secondary pressure by interlocking the hot water side and the water side. It is the same as when using the balance valve, but there is a difference when the water pressure on one side falls below the set pressure.

For example, if Yu圧there is water pressure 0.5 kg / cm ² for 2 kg / cm ^2, 2 primary pressure of the hot water side pressure regulating valve 18 and the water side pressure regulating valve 19 is 0.5 kg / cm ² and 1 kg / c
m ^2, and the especially when it is desired to obtain a mixed hot water of the cold, the secondary pressure
It can be supplied without much difference from the case of 1kg / cm ² and 1kg / cm ² , but when the pressure balance valve is used, the secondary pressure is 0.5kg / cm ² and 0.5kg.
Since it is / cm ² and the pressure on the water side is low, the amount of mixed hot water that can be supplied is smaller than that when using the independent hot water side pressure regulating valve 18 and water side pressure regulating valve 19 as in the present invention.

In this embodiment, the hot water side pressure regulating valve 18 and the water side pressure regulating valve 19
Since the secondary pressure is configured to be variable with the adjusting screw 28 or the like, it has the effect of increasing or decreasing the flow rate of the mixed hot water or the hot water / water depending on the usage situation. Also, the hot water pressure regulator
Since the water pressure regulating valve 18 and the water pressure regulating valve 19 are of a cylinder type composed of the pressure regulating valve body 20 and the like and the piston 22 and the like connected to the pressure regulating valve body 20 and the like, there is an effect that it can be made compact.

In the present embodiment, the mixed hot water temperature is detected by the thermistor 40, and the control of feeding back a signal is taken as an example, but the hot water temperature, the water temperature and the hot water flow rate, and the mixed hot water temperature are preliminarily measured to calculate the mixed hot water temperature. The idea of the present invention can also be applied to the feedforward control and the like that are obtained in.

Further, the mixing valve 29 has an example of a system in which the hot water valve body 30 and the water side valve body 31 are moved in inverse proportion to the valve seat by the shaft 32, but the hot water side and water side valve bodies are provided respectively. Alternatively, a method of independently driving by an electric driving means may be used.

Effects of the Invention As described above, according to the hot and cold water mixing apparatus of the present invention, the following effects can be obtained.

(1) By means of the hot water pressure regulating valve and the water pressure regulating valve provided independently of this hot water pressure regulating valve, the secondary pressures on the hot water side and the hot water side can be kept substantially constant independently of each other, and The fluctuation of the mixed hot water temperature when the water pressure fluctuates can be kept almost constant regardless of the fluctuation of the primary pressure by the pressure balancing means, and the temperature is controlled by the hot and cold water mixing valve that is electrically controlled during the hot water temperature fluctuation and the water temperature fluctuation. The mechanical system and the electric control system complement each other during any transient fluctuations, and a stable mixed hot water can be supplied.

(2) The hot water side pressure regulating valve and the water side pressure regulating valve provided independently of the hot water side pressure regulating valve independently control the secondary pressure on the hot water side and the water side by the pressure balancing means regardless of the fluctuation of the primary pressure. Since it can be kept substantially constant, the load on the electrically controlled hot and cold water mixing valve can be reduced, and the capacity of the electric drive means can be small.

(3) With the hot water pressure regulating valve and the water hydraulic pressure regulating valve provided independently of this hot water pressure regulating valve, the secondary pressures of the hot water side and the cold water side are independently provided by the pressure balancing means regardless of the fluctuation of the primary pressure. The problem that the secondary pressure is aligned to the lower pressure and the mixing flow rate is limited, which occurs when using a pressure balance valve that keeps the pressure on the hot water side and the pressure on the water side constant in order to keep it almost constant Therefore, even if one of the water pressure and the hot water pressure is low, a large amount of mixed hot water can be supplied.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a hot water mixing apparatus according to one embodiment of the present invention, and FIG. 2 is a block diagram of a conventional hot water mixing apparatus. 18: hot water pressure regulating valve, 19: water pressure regulating valve, 20: pressure regulating valve body, 22: piston (pressure balancing means), 27: spring (pressure setting means), 28: adjusting screw (pressure) Setting method), 29 ...
… Mixing valve (hot water mixing valve), 37 …… Mixing valve motor (electric drive means), 46 …… Controller, 47 …… Setting device (mixing hot water temperature setting device)

Claims (3)

(57) [Claims] 1. The hot water primary pressure is balanced by the pressure balancing means and the secondary pressure is set by the pressure setting means. The hot water primary pressure is reduced by a pressure regulating valve body connected to the pressure balancing means. The hot water pressure regulating valve that keeps the secondary pressure of the water pressure substantially constant, and the water pressure adjusting valve, which is independent of the hot water pressure regulating valve, balances the primary pressure of the water by the pressure balancing means to set the secondary pressure by the pressure setting means. A water side pressure regulating valve for reducing the primary pressure by a pressure regulating valve body connected to the pressure balancing means to keep the secondary pressure substantially constant;
A hot and cold water mixing valve provided on the secondary side of the hot water side pressure regulating valve and the water side pressure regulating valve for mixing hot water and water, an electric drive means for electrically driving the hot and cold water mixing valve, and a mixed hot water temperature. A hot and cold water mixing apparatus comprising: a hot water and hot water temperature setting device to be set; and a controller for driving and controlling the electric driving means according to the setting of the hot and cold water mixing device to adjust the mixing ratio of the hot and cold water mixing valve. 2. The hot and cold water mixing apparatus according to claim 1, wherein the hot water pressure regulating valve and the water pressure regulating valve are variable in pressure regulation. 3. The hot and cold water mixing apparatus according to claim 1, wherein the hot water side pressure regulating valve and the water side pressure regulating valve are of a cylinder type constituted by a pressure regulating valve body and a piston connected thereto.