JPH083759B2 - 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, inside a valve frame body 4 having 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 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. In the vicinity of the mixed hot water outlet 3, the mixed hot water temperature detector for detecting the mixed hot water temperature, the mixed hot water temperature set by the mixed hot water temperature setting device 12, and the mixed hot water temperature detector 11 are detected. The controller 13 compares the hot water temperature values 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, backlash of the linear motion conversion mechanism 9, and delay elements in the controller 13 Due to this, the control operation was delayed, 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 valve body 5 or the water side valve body 6 becomes excessive.
Also needed something of great ability.

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 balances the primary pressure of the hot water and reduces the primary pressure of the hot water to keep the secondary pressure substantially constant. Drives the hot water side pressure regulating valve and the water side pressure regulating valve which is independent of this hot water side pressure regulating valve and balances the primary pressure of water to reduce the primary pressure of water and keeps the secondary pressure substantially constant. The hot water side electric drive means for changing the setting of the secondary pressure of the hot water, the water side electric drive means for driving the water side pressure regulating valve to change the setting of the secondary pressure of the water, and the adjusted hot water and water It is configured by providing a mixed hot water temperature setting device for setting the temperature of the mixed hot water and a controller for controlling the hot water side electric driving means and the water side electric driving means according to the setting of the mixed hot water temperature setting device. is there.

With the above-described structure, the present invention controls the hot water side electric drive means and the water side drive means by the controller so as to obtain the mixed hot water temperature set by the mixed hot water temperature setting device. Setting the pressure regulator Change the secondary pressure to adjust the mixing ratio,
The hot-water pressure regulating valve and the water-side pressure regulating valve absorb fluctuations in the primary pressure of the hot water and water, and reduce the pressure applied to the hot-water electric drive means and the water-side electric drive means, thus mixing when the primary pressure changes. It is intended to reduce the overshoot and undershoot of the hot water temperature and to reduce the load on the electric drive means.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, for hot water and water supplied through the hot water flow path 15 and the water flow path 16, the hot water side pressure regulating valve 18 and the water side pressure regulating valve 19 provided in the valve frame body 17 are constituted by exactly the same parts. Therefore, the details will be described on the hot water side pressure regulating valve 18 side. A seal packing 21 is attached to the pressure regulating valve body 20, and is connected to a piston 23 by a shaft 22 via a locking metal fitting 24. The piston 23 is configured to be slidable in the cylinder 25 and has a seal packing.
At 26, the gap with the cylinder 25 is sealed. The piston 23 is urged by a spring 27 provided at the top,
The other end of 27 is held by a spring receiver 28. Spring support
Reference numeral 28 is pressed by a screw 29 which is a linear motion converting mechanism, and the screw 29 is configured to reduce the rotation of a hot water side motor 30 which is an electric driving means provided outside by a reduction gear 31 to rotate. ing. The upper limit and the lower limit of the rotation of the hot water side motor 30 are determined by the limit switches 32 and 33. Yu side motor 30
When is rotated, the screw 29 is rotated and the set load of the spring 27 is changed. Since the pressure receiving areas of the piston 23 and the pressure regulating valve body 20 are set to be equal, the primary pressure of the hot water is canceled out, and the pressure regulating valve body 20
The secondary pressure of the hot water acts on this, and pressure is applied from the bottom to the top in the figure. Weak spring provided for this secondary pressure and closing
The gap between the pressure regulating valve body 20 and the valve seat 35 is adjusted to a position where the sum of the set loads of 34 and the set load of the spring 27 are balanced. That is, the secondary pressure is adjusted by adjusting the set load of the spring 27. The water side pressure regulating valve 19 side is also configured in the same manner, and the rotation of the water side motor 36 controls the secondary pressure on the water side. The regulated hot water and water are squeezed by the orifices 37 provided on the hot water side and the hot water side, and merge and mix. The temperature of the mixed hot water is detected by the thermistor 38, and the mixed flow rate is detected by the flow rate sensor 39. The flow rate sensor 39 includes a fixed impeller 40 that swirls the flow, a ball 41 made of a magnetic material that rotates by the swirling flow, a ball outflow prevention receiver 42, and a sensor 43 including a magnet and a magnetic resistance element.

Then, the mixed hot water passes through the mixed hot water flow path 44 and is supplied from the faucet 45 to the hot water supply target. In the vicinity of the faucet 45, a setter for instructing start and stop of hot water supply, setting the mixed hot water temperature, the mixed flow rate, and the integrated value of the mixed flow rate, and displaying the current values of these
46 are provided. Signal from setter 46 and thermistor 38
Signal of the flow rate sensor 39 is transmitted to the controller 47,
The controller 47 includes a hot water motor 30, a water motor 35, and a setting device 46.
Control the display of.

Next, the operation of this embodiment will be described. When the hot water supply start is instructed by the setting device 46, the hot water motor 30 and the water motor 36 are controlled by the controller 47, and the set load of the spring 27 and the like is increased to adjust the amount of contact with the valve seat 35 and the like. The pressure valve body 20 and the like are opened, and the hot water and the water start to flow. The mixed hot water temperature is maintained by controlling the rotational speeds of the hot water side motor 30 and the water side motor 36 by the controller 47 while monitoring the value of the thermistor 38 so that the value set by the setting device 46 can be obtained. Then, the pressure regulating valve body 20 is continuously opened until the mixed flow rate set by the setter 46 is obtained. When the mixed flow rate reaches a predetermined value, the mixed hot water temperature is maintained against disturbance, so the hot water side motor 30 and the water side motor 36 make slight movement adjustments. Here, for example, if the setter 46 instructs to raise the temperature of the mixed hot water, the hot water motor 30 causes the hot water spring 27 to
Press to increase the set load and increase the secondary pressure,
The water side motor 36 reduces the set load and reduces the secondary pressure. As a result, the flow rate increases, the flow rate of water decreases, and the temperature of the mixed hot water rises. When the temperature of the mixed hot water detected by the thermistor 38 reaches a predetermined value, the temperature of the mixed hot water is finely adjusted as described above. The mixed hot water temperature detected by the thermistor 38 and the mixed flow rate detected by the flow rate sensor 39 are set via a controller 47.
Displayed at 46. When the mixing flow rate is being integrated, the integration is performed by the controller 47 and displayed in the same manner.
If another tap or hot water tap is used during use and the primary pressure of the hot water or water changes, the hot water pressure regulating valve 18 or the water pressure regulating valve 19,
It operates to maintain the secondary pressure at the set value. For this reason, since there is almost no change in the flow rate of hot water or the flow rate of water, the temperature of the mixed hot water does not overshoot or undershoot. Further, even if the primary pressure is large, due to the pressure reducing action of the hot water pressure regulating valve 18 and the water hydraulic pressure regulating valve 19, the hot water motor 30 and the water motor 36 need only generate a force corresponding to the secondary pressure.
Its ability is small. When it is desired to stop the hot water supply, the setting device 46 instructs the hot water side motor 30 and the water side motor 36 to reduce the set load of the spring 27, and finally by the urging force of the spring 34, the pressure regulating valve body. 20 is pressed against the valve seat 35, and the flow is stopped by the seal packing 21. Since the pressure regulating valve body 20 is closed while hot water supply is stopped,
The water is prevented from flowing backward when the water is cut off and flowing into the lower side with higher pressure. The advantage of such a method of controlling the pressure regulating valve itself is that, for example, when only low-temperature mixed hot water or water is desired to be output, the secondary pressure can be raised up to the primary pressure of water by setting, so The point is that a larger flow rate can be obtained compared to the balance valve system that balances the lower primary pressure.

In this embodiment, the hot water side pressure regulating valve 18 and the water side pressure regulating valve 19
Has a closing function that stops the flow of hot water and water,
This has the effect that the structure can be simplified without the need to provide a special closing valve. In addition, the hot water pressure regulating valve 18 and the water pressure regulating valve
19, the pressure regulating valve body 20 is connected to the piston 23, the cylinder 25
Since it is a cylinder type that slides inside, it has the effect of being compact. Further, since the setting of the secondary pressure is performed by changing the set load of the spring 27, there is an effect that the setting can be easily changed.

In the present embodiment, the mixed hot water temperature is detected by the thermistor 38, and a control method of feeding back a signal is taken as an example. The idea of the present invention can also be applied to feedforward control for obtaining the hot water temperature by calculation.

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

(1) The hot water side pressure regulating valve and the water side pressure regulating valve provided separately from the hot water side pressure regulating valve can independently maintain substantially constant secondary pressures on the hot water side and the water side. Means and the electric drive means on the water side can be reduced, the fluctuation of the mixed hot water temperature at the time of hot water pressure change and water pressure change can be reduced, and the temperature can be controlled by electrical control at the time of hot water temperature change and water temperature change. Adjustable, mechanical and electrical control complement each other during any transient fluctuations to provide a stable mixture of hot water.

(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 can maintain the secondary pressures on the hot water side and the water side independently and substantially constant. Occurs when using a pressure balance valve that keeps the secondary pressure of
The secondary pressure is aligned with the lower pressure, and the problem that the mixing flow rate is limited can be solved, and a large amount of mixed hot water can be supplied even if one of the water pressure and the hot water pressure is low. The problem that hot water or water leaks can also be solved, and high temperature or low temperature can be obtained as set.

(3) Since the hot water side pressure regulating valve and the water side pressure regulating valve which are independently provided on the hot water side and the water side are driven by the electric drive means to exert the function of the mixing valve, they may also serve as the mixing valve function. The configuration can be greatly simplified.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a hot and cold water mixing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional hot and cold water mixing apparatus. 18 …… Hot water pressure regulating valve, 19 …… Water pressure regulating valve, 20 …… Pressure regulating valve body, 23 …… Piston, 25 …… Cylinder, 30 …… Hot water side motor (electrical driving means for hot water side), 36… … Water side motor (water side electric drive means), 46 …… setting device, 47 …… control device.

Claims (4)

[Claims] Claim: What is claimed is: 1. A hot water pressure regulating valve, which balances the hot water primary pressure and reduces the hot water primary pressure to keep the secondary pressure substantially constant; Balance
A water side pressure regulating valve for reducing the primary pressure of water to keep the secondary pressure substantially constant, a water side electric drive means for driving the hot water side pressure regulating valve to change the setting of the secondary pressure of the hot water, and the water side regulating valve. Water side electric drive means for driving the pressure valve to change the setting of the secondary pressure of water, a mixed hot water temperature setting device for setting the temperature of the mixed hot water in which the regulated hot water and water are mixed, and this mixed hot water temperature setting A hot and cold water mixing device comprising a controller for controlling the hot water side electric drive means and the water side electric drive means according to the setting of the water heater. 2. 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 have a closing function for stopping the flow of hot water and water. 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 cylinder type having a pressure regulating valve body and a piston connected thereto. 4. The hot and cold water mixing apparatus according to claim 1, wherein the secondary pressure of the hot water side pressure regulating valve and the water side pressure regulating valve is set by changing the set load of the spring.