JPH03107683A - hot water mixing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

BACKGROUND OF THE INVENTION Conventionally, there has been a hot water mixing device of this type as shown in No. 41m.

In FIG. 4, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in association with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 that reduces the primary pressure PH1 of the hot water flow path 1, a hot water side valve seat 5, a water side valve body 6 that reduces the primary pressure PCI of the water flow path 2, and a water side valve body 6 that reduces the primary pressure PCI of the water flow path 2. The side valve seat 7, the valve shaft 8 that connects the hot water side valve body 4 and the water side valve body 6, and the 1 pyrotechnic PHI after depressurizing the field and water.
It is composed of a piston 9 that operates based on the PCI pressure difference, and even if the pressure of hot water or water suddenly changes, the automatic pressure regulating valve 3 moves with that pressure, and the secondary pressures PH2 and PC2 of hot water and water are always maintained. It works to maintain equality.

The hot water side valve body 4 and the water side valve body 6 each have a plurality of blades 1114a and 6a as rotational force generating means, and the automatic pressure regulating valve 3 is rotated by the flow of water with these blades, thereby preventing the adhesion of dust and scale. The mixing ratio of hot water and water is varied by moving a temperature control valve 12 energized by a motor 11 having a gear 10 from side to side to change the mixing temperature. Reference numeral 13 denotes a mixing section for hot water and water. After mixing, the hot water is discharged via a flow rate regulating on-off valve 14. The temperature of the hot water is detected by a thermistor 15, the flow rate is detected by a flow rate sensor 16, and the hot water is detected by a setting device 17. The controller 18 energizes the motor 11 and the flow control valve 14 to match the value.

Problems to be Solved by the Invention However, in the above configuration, the automatic pressure regulating valve 3 and the temperature regulating valve 12 are independent, resulting in a large size.

The present invention is intended to solve such conventional problems, and its purpose is to obtain a small-sized mixing device that combines the functions of a pressure regulating valve and a temperature regulating valve.

Means for Solving the Problems In order to achieve the above object, the hot water mixing device of the present invention has the following features:
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 a hot water side valve body and a water side valve body. A variable operating force generating means that opposes the forces due to the outlet pressures of the two and applies a biasing force, and a variable throttle that saturates the differential pressure generated at a predetermined flow rate are arranged between the hot water side valve body, the water side valve body, and the mixing section. They are prepared for each.

Operation With the above configuration, the mixing ratio is adjusted by the variable operating force generating means while balancing the outlet pressures of the hot water side valve body and the water side valve body.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Note that FIG. 1 is a sectional view of the hot water mixing device, and the same parts as in FIG. 4 are given the same numbers.

There is a variable operation generating means 19 on the water flow path 2 side, and the variable operation force generating means 19 has an iron core 20 and a waterproof and insulated coil 21 around the iron core 2o, and the coil 21 is connected to the control circuit 18. There is. When the coil 21 is energized, the iron core 2
0 moves downward, and connects the water side valve body 6, the water side valve shaft 6a integrated with this valve body, and the hot water side valve body 4 via the connecting shaft 22 attached to the iron core 2o and the contact body 23. Integrated hot water side valve shaft 4b
, the hot water side valve shaft 4 is moved integrally against the force of the main spring 24. The hot water side valve body 4, the hot water side valve shaft 4a, the water side valve shaft 6a, and the water side valve body 6 move together to form an automatic pressure regulating valve. 25 is a plug. Hot water side valve body 4 and water side valve body 6
constitutes a valve with holes 4b and 6b provided on the circumference, respectively, and the hole 4b of the hot water side valve body 4 and the hole 6b of the water side valve body 6 are connected from the hot water flow path 1 and the water flow path 2, respectively. The passed hot water and water pass through a hot water side variable throttle 26 and a water side variable throttle 27 and are mixed in the mixing path 13. The variable throttles 26 and 27 are the hot water side valve body 4
and springs 28 and 29 inside the water side valve body 6, respectively.
It's forced on me. For example, when hot water flows, a pressure difference is generated on both sides of the hot water side variable restrictor 26, and the hot water side variable restrictor 26 opens against the force of the spring 28.
The opening degree is determined according to the flow rate of the fluid passing through. By changing the force of the spring 28, the relationship between the passing flow rate and the pressure difference can be changed. The same goes for the water side. The fluids that have passed through the variable throttles 26 and 27 join together in the mixing section 13, and the hot water and water are further mixed.

Next, the present invention will be explained in detail. When the current is increased from the control circuit 18 to the coil 21, a strong downward force is generated in the iron core 20, urging the hot water side valve body 4 and the water side valve body 6 downward. As a result, the water side is closed and the hot water side is opened, and the outlet pressures PH2 and PO2 of the hot water side valve body 4 and the water side valve body 6 change respectively, acting as an automatic pressure regulating valve and being balanced. As a result, the mixed water temperature becomes high. Also, when the current of the coil 21 is reduced, the iron core 2
At 0, the downward force decreases, and the force of the main spring 24 moves the hot water side valve body 4 and the water side valve body 6 downward, opening the water side and closing the hot water side. As a result, the mixed water temperature becomes lower.

By changing the current flowing through the coil 21 in this manner, the balance point of the automatic pressure regulating valve can be moved. The mixed water temperature is detected by a thermistor 15 and calculated by a control circuit 18 to control the current to the coil 21. 2
The next pressure PH2 and PO2 are maintained at a balance point by the variable operating force generating means 19, and the change in the mixing ratio of hot water and water is small and the hot water temperature is stable.

In this ideal state, the hot water temperature does not fluctuate due to changes in pressure or flow rate, but due to machining accuracy, the hot water side valve body 4.
Dimensional error of water side valve body 6 or variable operating force generating means 19
Pressure adjustment errors occur in automatic pressure regulating valves due to the resolution and reproducibility of the valve, or the friction of sliding parts such as the valve body. In order to reduce fluctuations in water temperature due to pressure adjustment errors, the differential pressure generated between the variable throttles 26 and 27 must be at least a certain value. FIG. 2 shows the relationship between the flow rate passing through the water side variable throttle 27 and the differential pressure. Characteristic A in FIG. 2 shows the characteristic of the variable diaphragm of the present invention. Until the flow rate Qa, the water side variable throttle 27 is closed by the force of the spring 29, so the differential pressure increases rapidly. However, this differential pressure acts on the water side variable throttle 27, and the water Side variable aperture 2
7 to move downward and open it, from flow 11Qa to flow IQb.
The differential pressure increases linearly between When the water-side variable throttle 27 opens further as shown in FIG. 3B, the water-side variable throttle 27 deviates from the valve seat of the water-side valve body 6, and its opening area becomes extremely large, and the differential pressure becomes saturated at a flow rate of Qc or more. . When the valve seat of the water side valve body 27 is formed long, the opening area does not suddenly increase, resulting in characteristic B shown in FIG. 2. Hot water side variable throttle 2
6 also has similar characteristics.

Controlled by characteristic A in Figure 2? If the differential pressure required on il is Pl, 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 person using the toilet is Q2, the differential pressure will be P2. If a normal orifice is used instead of a variable orifice, the result will be as shown in characteristic C in Figure 2, and if the differential pressure P1 required for control is equal to that of the variable orifice, the minimum controllable water amount will be Q1'', and - large force. When the flow rate is Q2, the differential pressure becomes P2°.In addition, with the normal variable throttle shown in characteristic B, the differential pressure becomes P2'' when the maximum flow rate is f92. That is, when the variable throttle of the present invention is used, the minimum amount of water that can be controlled becomes small, and the differential pressure generated at the maximum flow rate becomes small. Therefore, the pressure loss in the passage can be reduced, and the maximum required driving force of the variable operating force generating means 19 can also be reduced.

Effects of the Invention As described above, the hot water mixing device of the present invention has a hot water flow path, a water flow path, a hot water side valve body and a water side valve body for adjusting the 2-ite amount of the hot water flow path and the water flow path, and a hot water side valve body. variable operating force generating means that makes the forces due to the outlet pressures of the hot water side valve body and the water side valve body oppose each other and applies a biasing force; Since they are installed between the automatic pressure regulating valve and the temperature regulating valve, it can be made smaller and cheaper by combining the automatic pressure regulating valve and the temperature regulating valve, and power can be transmitted to the automatic pressure regulating valve without contact, eliminating the need for seals on moving parts. It has high reliability, and the pressure loss is small and the required driving force of the variable operating force generating means is small.

[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 a variable throttle of the same device, FIGS. 3A and B are sectional views of a variable throttle of the same device, and FIG. The figure is a sectional view of the configuration of a conventional hot water mixing device. 1...Hot water flow path, 2...Water flow path, 4...
...Hot water side valve body, 6...Water side valve body, 13...
. . . Mixing section, 19 . . . Variable operating force generating means, 26 . . . Hot water side variable throttle, 27 . . . Water side variable throttle.

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. and variable operating force generating means for opposing the forces due to the outlet pressures of the water-side valve body and applying a biasing force, and a variable restrictor that saturates the differential pressure generated at a predetermined flow rate to the hot water-side valve body and the water-side valve body. A hot water mixing device provided between the valve body and the mixing section.