JPH0547844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water mixing type hot water supply temperature control device that supplies hot water by mixing hot water and water.

Conventional technology Conventionally, in this type of hot water temperature control device,
Storage-type electric hot water and boilers generally store hot water at a temperature of about 80℃ in order to increase the amount of heat stored, but the most common hot water temperature used was around 40℃. Therefore, a mixing valve installed in the terminal is used to mix water with water to obtain the appropriate temperature, but in order to obtain a desired amount of hot water at a desired temperature, troublesome adjustments are required.

That is, since the mixing valve has a structure in which the user adjusts the handle and controls the temperature by touching it with his/her hand, there are various problems.

Problems to be Solved by the Invention In the conventional temperature control device described above, the temperature control device had to be adjusted each time there was a change in water pressure due to opening and closing of other faucets. Moreover, the hot water used during these adjustment operations is wasted.
Furthermore, because priority is given to obtaining an appropriate temperature, there is a tendency to use more hot water than necessary, which poses many problems in terms of energy conservation.

The present invention is intended to solve these conventional problems, and aims to provide a hot water temperature control device that is easy to use, has stable temperature, and can save energy.

Means for Solving the Problems In order to solve the above problems, the hot water supply temperature control device of the present invention includes a hot water side valve body for adjusting the mixing ratio of hot water and water, a water side valve body, and at least a water side valve body. A diaphragm attached to the periphery facing the valve seat facing the valve body from the upstream side, a back pressure chamber separated from the main flow path by this diaphragm, and a back pressure chamber branched from the upstream side of the valve body. A communication hole that communicates with the valve body and rejoins the downstream side of the valve body, a control valve that adjusts the opening degree of this communication hole, a driving means that continuously drives this control valve, and a temperature that sets the temperature of the mixed water. A mixed hot water system installed in a hot water circuit where hot water adjusted by a setting device, a hot water side valve body, and a water side valve body flows together, and is installed downstream of the point where the communication hole joins the hot water circuit. The device includes a temperature detector that detects temperature, and a controller that compares signals from the temperature setting device and the temperature detector to control the driving means.

Effects The present invention has the above-described configuration, in which the temperature of hot water supplied to the faucet or shower is detected by a temperature detector, and the controller controls the driving means so that the temperature matches the target temperature set by the temperature setting device. By controlling the pressure in the back pressure chamber using the control valve, the mixing ratio of hot water and water is changed between the hot water side valve body and the water side valve body, improving operational ease of use, eliminating wasted hot water consumption, and saving energy. and,
This achieves the supply of mixture at the correct temperature.

Embodiments Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a block diagram of a hot water supply system according to an embodiment of the present invention. 1 is a hot water heat source composed of a heater 2 and a hot water storage tank 3. In the figure, an electric water heater powered by late night electricity is shown as an example. A pressure regulator 5 is inserted in the middle of the water supply circuit 4, and the water supply heat source 1 is
A hot water circuit 7 that passes through the hot water circuit 7 and a water circuit 8 that does not pass through the hot water heat source 1
Divert the flow into Both channels pass through a flow ratio control valve 9 and then merge to supply hot water to the faucets at each terminal through a hot water supply circuit 10. On the other hand, there is a temperature setting device 11 near the terminal faucet, and this signal is sent to the control circuit 12.
At this time, the signal is compared with the signal from the temperature detector 13 provided in the hot water supply circuit, and the flow rates of the hot water circuit 7 and the water circuit 8 are controlled by the flow rate ratio control valve 9 so that the difference is eliminated.

Now, let the temperature of hot water circuit 7 be T _H and the flow rate be Q _H ,
If the temperature of the water circuit 8 is T _C and the flow rate is Q _C , the temperature in the hot water supply circuit 10 after merging is T and the flow rate Q, and the set temperature in the temperature setting device 11 is T _S , the following relationship is obtained. There is.

T _H Q _H +T _C Q _C −TQ ...1 Q _H +Q _C =Q ...2 Next, if K is the ratio of the flow rate Q _H of the hot water circuit to the total flow Q, then Q _H = KQ ...3 Q _C =(1-K)Q...4 When K is determined from the above four equations, 5 equations are obtained.

K=T-T _C /T _H -T _C ...5 Here, the flow rate ratio K that should make T=T _S is K=T _S -T _C /T _H -T _C ...6 , the set temperature T _S , and the respective temperatures T _H and T _C of the hot water circuit and the water circuit.

Figure 2 shows _K (=
The value of Q _H /Q) is shown. If T _S = T _H then K = 1
If T _S = T _C , then only the water circuit will open when K=0. In a hot water storage type water heater, T _H = 80°C, and in order to obtain a shower of 40°C even if the water temperature changes between 5°C and 30°C, K needs to vary between 0.47 and 0.2. Estimation is possible. Controlling the flow rate ratio control valve 9 based on the signal from the temperature detector 13 means that the flow rate ratio control valve 9 is automatically brought into agreement with the value of the flow rate ratio K determined by Equation 6. FIG. 3 is a control block diagram showing the temperature setting device 1.
This shows that the flow ratio control valve 9 is controlled by the signal T _S of 1 and the signal T of the temperature sensor.

By the way, if we consider the case where the opening degree of the hot water faucet is changed after the temperature has been set and the hot water supply faucet is controlled to be supplied at a predetermined flow rate, the supply pressure will be lower than the hot water circuit 7.
If the opening area ratio is different in the water circuit 8, the flow rate ratio will change if the opening area ratio remains the same. For example, when the pressure regulator 5 is inserted only into the hot water circuit 7 side and the source pressure is applied directly to the water circuit 8 side, this tendency is remarkable, and each time the flow rate is adjusted with the faucet, the predetermined flow rate ratio is In order to maintain this, it is necessary to change the aperture ratio. This not only shortens the life of the flow rate ratio control valve 9 , but also causes transient temperature changes due to delayed response. Therefore, if a common water supply circuit 4 is provided for the hot water circuit 7 and the water circuit 8, and a pressure regulator 5 is inserted therein, the pressure difference from the branch section 6 to the confluence section 14 of both circuits will always be the same. There is no change in hot water temperature due to changes in flow rate when changing the faucet opening.

Next, an example of the flow ratio control valve 9 will be described. FIG. 4 shows an example of a flow rate ratio control valve 9 using a pilot type control valve. Hot water circuit 7 and water circuit 8
An identical pilot type control valve 15 is provided immediately before the merging section 14. Here, there is a valve seat in the main passage.
6, and a valve seat 16 having a corresponding valve body portion.
A diaphragm valve 17, which is a partitioning means, has a diaphragm membrane facing upstream from the valve body that comes into contact with the diaphragm valve 17, and is provided so that the degree of opening can be adjusted. The difference between the inlet pressure and the outlet pressure is applied to the chamber 18 by dividing the pressure through a fixed orifice 19, which is a communication hole, and a pilot valve 20, which is a regulating valve. The opening degree of the pilot valve 20 is continuously controlled according to the equilibrium point between the force generated on the plunger 22 by the coil 21 and the force of the control spring 23. 24
is a main spring that biases the diaphragm valve 17 in the closing direction.

Now, if the current to the coil 21 is zero, the pilot valve 20 is fully closed by the force of the control spring 23. As a result, the supply pressure is applied to the back pressure chamber 18, and a pressure difference is generated between the pressure on the main passage side of the diaphragm valve 17, and the force due to the pressure difference and the force of the main spring 24 cause the diaphragm valve to fully move. Closed. When a small amount of current flows through the coil 21 and the pilot valve 20 opens slightly, the pressure in the back pressure chamber 18 decreases to a value divided by the resistance ratio between the orifice 19 and the pilot valve 20. Since supply pressure is applied in the direction in which the diaphragm valve 17 is opened, a valve opening is maintained such that the force in the opening direction generated by this pressure difference and the force of the main spring 24 are balanced. When the current in the coil 21 increases, the opening degree of the pilot valve 20 increases and the pressure in the back pressure chamber 18 decreases. As a result, the force in the opening direction of the diaphragm valve 17 increases, so the valve opening determined in balance with the main spring 24 also increases. In this way, the valve opening degree of the diaphragm valve 17 can be controlled according to the current value to the coil 21. In this pilot type, the pilot valve 20 is used to determine the valve opening degree based on fluid pressure.
A small displacement of the diaphragm valve 17 translates into a large amount of movement of the diaphragm valve 17, and a small force that moves the pilot valve 20 is amplified into a large force that moves the diaphragm valve 17. Therefore, the actuator composed of the coil 21 and the plunger 22 can be made smaller and have less power than the direct-acting valve system. Here, the temperature detector 13 is provided in the hot water supply circuit 10 through which the hot water and water adjusted by the flow rate ratio control valve on the hot water side and the flow rate ratio control valve on the water side flow. Since the communication hole 19 is provided on the downstream side of the confluence point with the main flow path, hot water from the communication hole does not mix after the temperature sensor 13, and accurate temperature can be obtained. In addition to the actuator shown in FIG. 4, a drive system using a motor and a cam may also be considered, but reducing the power of these actuators also makes it possible to reduce the capacity of the control circuit 12.

Furthermore, even if a hole is made in the diaphragm part of the diaphragm valve 17 or the surrounding support is removed, since the diaphragm part is located upstream of the valve part, the flow path will be blocked by the valve body or the diaphragm itself, and the flow will not flow. can be stopped or the flow rate can be reduced. Then, as the temperature detected by the temperature detector 13 changes, in order to maintain the set temperature in a controlled manner, the valve on the non-failure side is throttled, stopping the hot water supply or reducing the flow rate, which may cause mischief in the event of a malfunction. No hot water or water is washed away.

In FIG. 4, the flow rate ratio control valve 9 is composed of two pilot type control valves, but FIG. 5 shows an example in which these are integrated. The pilot type control valve itself is the fourth
This is the same as the example in the figure. However, the pilot valve 20
The actuator 25 for driving may be composed of a coil, a plunger, and a control spring, or may be a motor and a cam. In this configuration, the merging section 14 is included in the flow rate ratio control valve 9 .

Next, FIG. 6 shows an example in which the flow rate ratio is controlled using a single actuator 25 using a pilot type control valve system. Here, a diaphragm 26 is provided on the water circuit 8 side, and the orifice 19, back pressure chamber 18, pilot valve 20, and actuator 25 are the same as in the case of FIG. Then, the valve seat 27 on the water circuit side and the valve seat 28 on the hot water circuit side are provided facing each other on the same axis, and the diaphragm 2
6 corresponds to each valve seat. As described above, since the position of the diaphragm 26 can be controlled by inputting a signal from the actuator 25, the degree of opening on the water side and the hot water side can be controlled by moving the valve body 29 up and down.

Now, if the pilot valve 20 is fully closed, the water circuit 8 is fully closed and the hot water circuit 7 is fully open, and conversely, if the pilot valve 20 is fully open, the water circuit 8 is fully open and the hot water circuit 7 is fully closed. If the pilot valve 20 is at an intermediate opening,
The aperture ratio of both circuits is selected according to the opening degree.
That is, the flow rate ratio can be controlled with one signal from the actuator 25, and the control system can be simplified.

Among the above embodiments, especially as shown in FIG.
A hot water side valve body and a water side valve body are integrally provided as a valve plug 29, and a back pressure chamber 18, a fixed orifice 19 which is a communication hole, and an actuator 25 which is a driving means.
In the case of a type in which the actuator 25 is provided only on one side, only one actuator 25 is required, and power consumption can be further reduced, so that it has the effect of being easily developed into a battery-driven mixing valve.

Effects of the Invention As described above, according to the hot water supply temperature control device of the present invention, the following effects can be obtained.

This system mixes and supplies water from the water circuit 8 that does not pass through the hot water heat source 1 , and automatically selects the optimum mixing ratio according to the signal from the temperature setting device 11. There is no need for adjustment operations to set the temperature, and once the temperature is set, the temperature does not change even if the amount is adjusted by the faucet opening, greatly improving usability.
In addition, not only does it eliminate overflowing of hot water and loss of hot water during the adjustment time, but it also has great energy-saving effects, such as less heat dissipation loss from piping than when supplying high-temperature hot water.

Furthermore, since the hot water side valve body and the side valve body are not directly moved by the driving means, but a control valve that adjusts the communication hole to the back pressure chamber is moved, boosting force can be achieved using the force of the fluid. There is no need to consume energy.

In addition, since the diaphragm faces the valve seat facing the valve body from the upstream side, even if the valve seat is damaged due to a hole, etc., the diaphragm will block the valve seat and stop the flow of hot water or the flow rate. In order to narrow down the
It will not continue to flow to the person who is inadvertently malfunctioning.
In addition, the hot water and water whose mixing ratio is adjusted by the hot water side valve body and the water side valve body, and the hot water that passes through the communication hole adjusted by the control valve,
Since the mixed water temperature is detected with a temperature sensor after all the water has joined, the hot water that passes through the communication hole does not mix after the temperature is detected, and the mixed water temperature as set is obtained. .

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a hot water supply system of a hot water temperature control device according to an embodiment of the present invention, Fig. 2 is a characteristic diagram required for the flow rate ratio control valve, Fig. 3 is a control block diagram of the same, and Fig. 3 is a diagram of the same control block diagram. FIG. 4, FIG. 5, and FIG. 6 are structural sectional views showing embodiments of the flow rate ratio control valve, respectively. 11...Temperature setting device, 12...Control circuit (controller), 13...Temperature detector, 17...Diaphragm valve (hot water side valve body, water side valve body), 17A...Diaphragm, 18...Back Pressure chamber, 19...fixed orifice (communication hole), 20...pilot valve (control valve),
21... Coil (driving means), 25... Actuator (driving means), 29... Valve plug (hot water side valve body, water side valve body).

Claims (1)

[Scope of Claims] 1. A hot water side valve body for adjusting the mixing ratio of hot water and water, a water side valve body, and an upstream side valve on opposing valve seats of the valve body attached at least around the water side valve body. A diaphragm facing from above, a back pressure chamber formed by being partitioned from the main flow path by this diaphragm, and a back pressure chamber that is branched from the upstream side of the valve body and communicates with the back pressure chamber, and merges again on the downstream side of the valve body. a control valve that adjusts the opening degree of the communication hole, a driving means that continuously drives the control valve, a temperature setting device that sets the temperature of the mixed hot water, the hot water side valve body, and the water side valve body. a temperature detector for detecting the temperature of mixed hot water, which is installed in a hot water circuit where hot water regulated by a side valve body and water flow together, and which is installed downstream of the point where the communication hole joins the hot water circuit; A hot water temperature control device comprising a controller that compares signals from the temperature setting device and the temperature detector to control the driving means. 2. The hot water temperature control device according to claim 1, wherein the hot water side valve body and the water side valve body are integrally provided, and a back pressure chamber, a control valve, and a driving means are provided only on one side.