JPH03219181A - Hot-cold water combination faucet device - Google Patents

Abstract

PURPOSE:To enable the table adjustment of a mixing ratio of hot water and cold water, and the forced displacement of a variable throttle with a variable throttle operation force generating means by providing the variable throttle between hot water and cold water side valve bodies, and a mixing section, and the aforesaid variable operation force generating means. CONSTITUTION:A combination faucet device is equipped with a hot water side valve body 19 and a cold water side valve body 18 respectively for regulating the flowrate of a hot water passage 11 and a cold water passage 12, a mixing section 33 for the aforesaid passages 11 and 12, variable throttles 29 and 30 provided between the aforesaid valve bodies 19 and 18, and mixing section 33, and a variable operation force generation means 13 for causing forces due to the outlet pressure of the aforesaid valve bodies 19 and 18 to oppose each other. Furthermore, the valve bodies 19 and 18 are operated with the variable operation force generating means 13 for adjusting a mixing ratio and forcibly displacing the variable throttles 29 and 30.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water mixing device that adjusts the mixing ratio of hot water and water to obtain an optimal mixed water temperature.

2. Description of the Related Art Conventionally, there has been a hot water mixing device of this type as shown in FIG.

1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in relation to each flow path, and this automatic pressure regulating valve 3 has a hot water side valve body 4, a water side valve body 5, and both valve bodies. The shaft 6 and the piston 6a that connect the
Even if the pressure of hot water or water suddenly changes, the automatic pressure regulating valve 3 moves with the pressure to stabilize the mixed water temperature. This automatic pressure regulating valve 3 is biased by bias means 9 consisting of a coil 7 and a magnet 8.
It changes the mixing ratio of hot water and water.

Problems to be Solved by the Invention However, in the above configuration, since there is a fixed restriction between the hot water side valve body 4, the water side valve body 5, and the mixing section, that is, the fluid resistance is constant, there are the following drawbacks. In other words, the relationship between the flow rate on the hot water side or the water side and the differential pressure between the hot water side valve body 4, the water side valve body 5, and the mixing section is shown in Figure 3, but it is well known that the case where the fluid resistance is constant is The differential pressure increases in proportion to the square of the flow rate, resulting in a relationship as shown in characteristic B. It is driven by the bias means 9 against the force caused by the product of this differential pressure and the cross-sectional area of the hot water side valve body 4 or the water side valve body 5.

For this reason, if the fluid resistance is increased, the bias means 9 will need a large force when the flow rate increases, and if the fluid resistance is small, the differential pressure that occurs when the flow rate is low is small, and errors caused by friction etc. cannot be ignored and the mixing ratio will be reduced. Becomes unstable.

Means for Solving the Problems In order to achieve the above object, the hot water mixing device of the present invention has a hot water flow path, a water flow path, and a flow rate of the hot water flow path and the water flow path.
The hot water side valve body and the water side valve body, the mixing part of the hot water flow path and the water flow path, the variable throttle provided between the hot water side valve body, the water side valve body, and the mixing part, and the hot water side valve body. It is equipped with a variable operating force generating means that counteracts forces due to the outlet pressures of the valve body and the water side valve body and applies an operating force to the hot water side valve body and the water side valve body.

Operation With the above configuration, the mixing ratio is adjusted by operating the hot water side valve body and the water side valve body by the variable operating force generating means, and the variable throttle is forcibly displaced by the variable operating force generating means. .

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a sectional view of a hot water mixing device. The mixing valve main body 10 has a hot water flow path 11 and a water flow path 12. On the water flow path 12 side, there is a variable operating force generating means 13.
4 and a waterproof and insulated coil 15 around the iron core 14
The coil 15 is electrically connected to a controller 16. The lower end of the iron core 14 is in contact with the upper end of the valve shaft 17,
On this valve shaft 17, a water side valve body 18 and a hot water side valve body 19 are pressed against stops 24 and 25 by springs 22 and 23 via spacers 20 and 21, and move together with the valve shaft 17. The water side valve body 18 and the hot water side valve body 19 engage with the water side valve hole 10a and hot water side valve hole 10b of the mixing valve main body 10, respectively, to adjust the flow rates on the hot water side and the water side. A piston 17a is located in the center of the valve shaft 17, and a piston ring 26 is provided in the groove of the piston 17a.
slides on the balance hole 10c in the mixing valve main body 10. The inner diameters of the balance hole 10c, the water side valve hole 10a, and the hot water side valve hole 10b are approximately the same, and the hot water flow path 11
and the inlet pressure of the water flow path 12 are balanced. Valve stem 17
A main spring 27 is provided at the lower end of the main spring 27 and urges the valve shaft 17 upwardly via a spring seat 28. The iron core 1 is operated by the variable operating force generating means 13 against the force of the main spring 27.
The valve shaft 17 is moved by the driving force of 4. Coaxially with the valve shaft 17, a water side variable throttle 29 and a hot water side variable throttle 30 are pressed against differential pressure valve holes 10d and 10e on the mixing valve body 10, respectively, by differential pressure springs 31 and 32.

The water side variable throttle 29 and the hot water side variable throttle 30 are separated from the valve shaft 17, and the degree of opening changes depending on the flow rate of hot water or water passing through these variable throttles. For example, when hot water flows, a pressure difference is generated on both sides of the hot water side variable throttle 30, and the hot water side variable throttle 30 opens against the force of the differential pressure spring 32.

Characteristic A in FIG. 3 shows an example of the relationship between the flow rate and differential pressure of this variable throttle. By changing the force of the differential pressure spring 32, the relationship between the passing flow rate and the pressure difference can be adjusted. The same goes for the water side.

From the hot water flow path 11 and the water flow path 12, the hot water side valve body 19 and the water side valve body 2
The hot water and water that have passed through the hot water side variable throttle 30 and the water side variable throttle 29 are mixed in a mixing path 33, and the temperature of the hot water is detected by a temperature detector 34.

Next, the present invention will be explained in detail. controller 16 to coil 1
5, when the current is increased, a strong downward force is generated in the iron core 14, which urges the valve shaft 17 downward against the force of the main spring 23. As a result, the water side is closed and the hot water side is opened, and the outlet pressures of the hot water side valve body 19 and the water side valve body 18 change, respectively.
The pressure acts on the hot water side valve body 19 and the water side valve body 18 to create a balance. As a result, the temperature of the mixed water increases. Further, when the current in the coil 4 is reduced, the downward force on the iron core 14 is reduced, and the valve shaft 17 is moved upward mainly by the force of the spring 23, thereby opening the water side and closing the hot water side. As a result, the mixed water temperature becomes lower. The mixed water temperature is detected by a temperature detector 34 and calculated by a controller 16 to control the current to the coil 15.

In this ideal state, the hot water temperature does not fluctuate due to changes in pressure or flow rate, but the hot water side valve body 19 due to processing accuracy
The pressure iP1 adjustment error occurs due to dimensional errors in the water side valve body 18 and piston ring 26, or the resolution and reproducibility of the variable operating force generating means 28.

In order to reduce fluctuations in hot water temperature due to pressure adjustment errors, the differential pressure generated between the variable throttles 29 and 30 must be at least a certain value. If the differential pressure required for control in the characteristic A of FIG. 2 is Pl, then the minimum amount of water that can be controlled between the hot water side and the water side is Ql. On the other hand, if the maximum flow rate required by the user is Q2, the differential pressure will be P2. If a normal orifice is used instead of a variable throttle, the result will be as shown in characteristic B in Figure 2. If the differential pressure P1 required for control is equal to that for the variable throttle, the minimum controllable water volume will be Ql', while the maximum flow rate will be At Q2, the differential pressure becomes P2°. That is, when a variable throttle is used, the minimum amount of water that can be controlled becomes smaller, and the differential pressure generated at the maximum flow rate becomes smaller. Therefore, the pressure loss in the passage can be reduced, and the maximum required driving force of the variable operating force generating means 13 can also be reduced.

When the current to the coil 15 is cut off, the electromagnetic force on the iron core 14 disappears, the valve stem 17 is pushed by the main spring 23 and moves upward, the water side valve body 18 comes into contact with the variable throttle 29, and the variable throttle 29 is removed from the differential pressure valve hole 10d. Conversely, when the current to the coil 15 is maximized, the electromagnetic force applied to the iron core 14 increases, the valve shaft 17 moves downward against the force of the main spring 23, and the hot water side valve body 19 controls the variable throttle 30. It is removed from the differential pressure valve hole 10e.

Effects of the Invention As described above, the hot water mixing device of the present invention has a hot water flow path and a water flow path, a hot water side valve body and a water side valve body that adjust the flow rates of the hot water flow path and the water flow path, and a hot water flow path and a water flow path. Variable throttles are provided between the mixing section of the passage, the hot water side valve body, the water side valve body, and the mixing section, and the forces due to the outlet pressures of the hot water side valve body and water side valve body are opposed to each other, and the hot water side valve body and water side valve body are The variable operating force generating means applies an operating force to the side valve body and the water side valve body, and the mixing ratio is adjusted by operating the hot water side valve body and the water side valve body with the variable operating force generating means. Since the variable throttle is forcibly displaced by the variable operating force generating means, the pressure loss is small and the required driving force of the variable operating force generating means is small. In addition, even if an abnormality occurs in which the variable throttle is stuck due to adhesion of scale or foreign matter, causing malfunction, the variable throttle can be forcibly closed by automatically or artificially operating the variable operating force generating means. It can be removed from the seat and has high reliability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hot water mixing device according to an embodiment of the present invention, Fig. 2 is a characteristic diagram of the variable throttle of the same device and a conventional hot water mixing device, and Fig. 3 is a structural sectional view of a conventional hot water mixing device. It is. 11...Hot water flow path, 12...Water flow path, 1
3...Variable operating force generating means, 18...
Water side valve body, 19...Hot water side valve body, 29, 30...
...Variable aperture, 33...Mixing section.

Claims (1)

[Claims] A hot water flow path and a water flow path, a hot water side valve body and a water side valve body that adjust the flow rates of the hot water flow path and the water flow path, a mixing part of the hot water flow path and the water flow path, and the hot water side valve body. - A variable throttle provided between the water side valve body and the mixing section, and the force due to the outlet pressure of the hot water side valve body/water side valve body are opposed to each other, and the hot water side valve body/water side valve body A hot water mixing device, comprising: variable operating force generating means for applying an operating force to a valve body, and forcibly displacing the variable throttle by the variable operating force generating means.