JPS62174813A - Temperature controller for supply hot water - Google Patents

Abstract

PURPOSE:To improve convenience to use and save energy by permitting a controller to control a hot water side drive means and a cold water side drive means in accordance with the signal deviation of a temperature detector from a temperature setting device and adjusting the water ratio of cold water to hot water through a hot water side value and a cold water side value. CONSTITUTION:A pressure controller 5 is inserted in the middle of a water supply circuit 4, and a bypass device 6 bypasses a flow to a hot water circuit 7 passing through a supply hot water heating source 1 and a cold water circuit not passing through said source 1. After both channels are passed through a flow rate control value 9, they put together and fed to the faucet of each terminal through a supply hot water circuit 10. The temperature setting device 11 is provided in the vicinity of the terminal faucet, and its signal is compared with a signal from the temperature detector 13 provided in the supply hot water circuit. The flow rate control value 9 controls the flow of the hot water circuit 7 and the cold water circuit 8 so that the difference between both flows can be zero. A common supply water circuit 4 is installed for the hot water circuit 7 and the cold water circuit 8, and here the pressure controller 5 is inserted. Then the pressure difference between a bypass part 6 and a junction part 14 comes to zero, whereby the temperature of supply hot water never changes even if the flow changes by modifying a faucet opening.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water supply temperature control device that controls the flow rate ratio of hot water to water to obtain an appropriate temperature.

Conventional hot water storage type electric water heaters and boilers generally store hot water at a temperature of about 80°C in order to increase the accumulated heat 'fik, but the temperature of hot water used is most often around 40°C. Therefore, in order to control the hot water temperature, a mixing valve is used to mix the water and hot water to obtain the appropriate temperature, but in order to obtain a desired /PA amount at a desired hot water temperature, a tedious adjustment is required. In particular, if there was a change in water pressure due to the opening or closing of other faucets, it had to be adjusted each time.

Also, the high temperature (L) during these adjustment operations was wasted in jH1°C. Furthermore, ;'I &'In'
Since priority is given to obtaining 'r, there is a tendency to pour more hot water than necessary, which poses many problems in terms of energy conservation.

In addition, there were some instant water heaters that could change the hot water temperature, but even if you changed the setting to 21+II degrees, the amount of water held in the heat exchanger 2 and the heat toxicity of the heat exchanger itself caused it to change immediately. The temperature of the hot water supply was unimaginable.

Problems to be Solved by the Invention As mentioned above, the conventional hot water temperature control device has problems in terms of usability,
There are many problems in terms of energy conservation, and the present invention aims to solve these conventional problems and provide a hot water temperature control device that improves usability and saves energy.
It has been the target.

Means for Solving the Problems In order to solve the above problems, the hot water temperature control device of the present invention has a hot water side valve in the hot water circuit, a water side valve in the water circuit, and electrically connects these valves. Comparing the hot water side driving means to be driven, the water side driving means, a temperature detector for detecting the mixed hot water temperature, a temperature setting device for setting the mixed hot water temperature, and the signals of these temperature detectors and the temperature setting device, It is configured to include a hot water side drive means and a control 2t for controlling the water side drive means.

Effect of the Invention With the above-described configuration, the present invention controls the hot water side drive means and the water side drive means with the controller according to the signal deviation of the temperature detector and the temperature setting device, and controls the hot water side with the hot water side valve and the water side valve. The flow rate ratio of water and water is adjusted to obtain a set mixed water temperature.

Example 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, where 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,
The water flow is divided into a hot water circuit 7 which passes through the hot water supply heat source 1 and a water circuit 8 which does not pass through the hot water supply heat source 1 at a diversion part 6. 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.
The flow rate of the hot water circuit 7 and the water circuit 8 is controlled by a flow rate ratio control valve 9 so that the signal from the temperature detector 13 provided in the hot water supply circuit is compared and the difference is eliminated.

Now, the temperature of the hot water circuit 7 is shown as TH, the flow rate is shown as QH, the temperature of the water circuit 8 is shown as Tc, the flow rate is shown as QC, the temperature in the hot water supply circuit 10 after merging is shown as T, and the flow rate is shown as Q, and the temperature is further set. Vessel 11
If the set temperature is expressed as 75, the following relationship exists.

THQ+TCQC=TQ --------
--・IQH+QC=Q...
...Secondly, the flow QQs of the hot water circuit with respect to the total flow Q
If we express the ratio of QH=toQ...
・・・・・・3QC=(1-K)Q -----
---・-5 equations are obtained from the four equations greater than or equal to 4.

Here, the flow rate ratio that should be T=75 requires six equations: set temperature TS, each temperature T of the hot water circuit and water circuit, 1. It will be determined by T(:.

Figure 2 shows the K (=QH/Q) that should be selected depending on the set temperature Ts.
) is shown. If T5=TH, then only the hot water circuit will open when it is 1; if TS=TC, then only the water circuit will open when it is 0. In a hot water storage type water heater, T)4 = 80℃, and in order to obtain a shower temperature of 40℃ even if the water temperature changes between 5℃ and 30℃, K must be between 0.47 and 0.2. It is possible to estimate that it would be better if things changed. Controlling the flow rate ratio control valve 9 by the signal from the temperature detector 13 means that the flow rate ratio is automatically brought into agreement with the value determined by Equation 6. FIG. 3 is a control block diagram, in which the temperature setting device 1
It is shown that the flow rate ratio control 11 valve 9 is controlled by the signal T5 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 water supply is controlled to be supplied at a predetermined flow rate ratio, if the supply pressure is different between the hot water circuit 7 and the water circuit 8, Even if the opening surface is the same, the flow rate ratio will change if the °1 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 response delays. 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.

Figure 4 shows an example using two motor valves, and the merging section 14
A hot water side valve 17 and a water side valve 1 of the same structure are formed by a valve seat 15 and a corresponding valve plug 16 in a sprue passage 7 and a water circuit 8 immediately before the
7' is inserted, and its opening degree is rotated by a hot water side motor 18 and a water side motor 18', which are electrical drive means.
It is controlled by 9. The motors 18 and 18' are driven by a servo system having a feedback loop that detects the angular position, and the angle can be adjusted by controlling positive and negative pulses like a pulse motor.

Although the valve openings of both circuits are independent, both are driven by the control circuit 12 to adjust the openings so that the value shown in equation 6 is obtained.

Figure 5 shows Takigawa ratio control valve 9 using a pilot type control valve.
An example is shown. There is a confluence section 14 between the hot water circuit 7 and the water outlet path 8.
An identical pilot-operated control valve 19,19' is provided immediately before. Here, a valve seat 20 is provided in the main passage, and a diaphragm valve 21 is provided correspondingly so that the degree of opening can be adjusted. Fixed orifice 23 and pilot valve 2
The pressure is divided by 4 and added. The pilot valve 24 has a coil 25
The degree of opening is controlled according to the equilibrium point between the force generated on the plunger 26 and the force of the control spring 27. 2
8 is a main spring that biases the diaphragm valve 21 in the closing direction.

Now, if the current to the coil 25 is zero, the control spring 2
The pilot valve 24 is fully closed by the force of 7. As a result, supply pressure is applied to the back pressure chamber 22, and the diaphragm valve 2
A pressure seat is generated between the main passage side pressure of the first spring and the main passage side pressure of the first spring, and the diaphragm valve is fully closed by the force due to the pressure difference and the force of the main spring second.

A small amount of current flows through the coil 25, causing the pilot valve, 24
When the back pressure chamber 22 opens slightly, the pressure in the back pressure chamber 22 decreases to a value divided by the resistance ratio between the orifice 23 and the pilot valve 24. Since the supply pressure is applied in the direction in which the diaphragm valve 21 is opened, the valve opening is maintained such that the force in the opening direction generated by this pressure difference and the force of the main spring 21 are balanced. When the current in the coil 25 increases, the opening degree of the pilot valve 24 increases and the pressure in the back pressure chamber 22 decreases. As a result, the force in the opening direction of the diaphragm valve 21 increases, so the valve opening degree determined in balance with the main spring 28 also increases. In this way, depending on the current value to the coil 25, the diaphragm valve 21
The valve opening degree can be controlled. Therefore, the control valve 19.
The opening adjustment section 19' allows the flow ratio to be adjusted, the amount of hot water supplied, and the hot water supply to be stopped. In this pilot type, the valve opening is determined by fluid pressure, so a small displacement of the pilot valve 24 is converted into a large amount of movement of the diaphragm valve 21, and the minute force that moves the pilot valve 24 is This amplifies the force into a large force that moves the valve 21. Therefore, compared to the direct-acting valve system described in FIG. 4, the actuator composed of the coil 25 and plunger 26 can be made smaller and have less power. In addition to the actuator shown in FIG. 5, 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 size f; of the control circuit 12.

In Figure 5, two pilot control valves control the flow rate at 1aT.
An example of an integrated I-valve 9 is shown in FIG. The pilot type control valve itself is the same as the example shown in FIG. However, the structure of the actuator 29 that drives the pilot valve 24 may be 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.

The method of controlling the flow rate ratio of the hot water circuit 7 and the water circuit 8 is not limited to the vicinity of the confluence section 14 of both flow paths, and there is also a method of providing the flow rate ratio in the branch section 6 from the original water supply circuit 4.

An example is shown in FIG. The symbols provided here are components indicating the same functions as in FIG. 1.

Since the flow of water is continuous, controlling the splitting ratio is equivalent to controlling the merging ratio, and the effects are the same. However, since it is a method of controlling water before it is heated, it has the effect of reducing deterioration of rubber parts such as O-rings and diaphragms.

In this case, the flow rate ratio control valve 9 can be applied with the same structure as described in the examples of FIGS. 4 to 6, or with some modifications.

Furthermore, it is also possible to structurally integrate the pressure regulator 5 and the flow ratio control valve 9, an example of which is shown in FIG. Here, a check valve 31 is provided with a check spring 30 biased in the closing direction with respect to the water supply circuit 4, and when opened by the water supply pressure and negative pressure is generated, it acts to close and prevent backflow. There is. Next, there is a valve seat 33 on which the pressure reducing valve seat 32 is located.
corresponds. On the other hand, a cylinder portion 34 having substantially the same inner diameter is formed on the opposite side of the pressure reducing valve seat 32, and a piston portion 35 interlocking with the valve seat 33 is inserted inside the cylinder portion 34. In this way, the force due to the water supply pressure applied to the valve seat 33 is configured to be balanced with the force due to the water supply pressure applied to the piston portion 35. These valve seat 33 and piston portion 35 are fixed to a growing diaphragm 36 and move up and down at Igl.

In the pressure reducing diaphragm 36, the reduced pressure after passing through the pressure reducing valve seat 32 is collected in the diaphragm chamber 37, so that an upward force is generated in the figure. The pressure reducing spring 38 opposes this force. A movement adjustment operation is automatically performed to a position where the set spring force and the force of the pressure reducing diaphragm 36 are balanced. If the pressure increases now, the pressure reducing diaphragm 36
As the force increases, the valve seat 33 rises and narrows the opening degree, and in the opposite case, the valve seat 33 absorbs the pressure change by widening the opening degree. Following the pressure regulator 5 is a flow rate ratio control valve 9, which in this example is comprised of two pilot type control valves. The operation of this part has already been explained. This integration has advantages in terms of handling, construction, and manufacturing.

As described above in the embodiment, the optimum mixing ratio is automatically selected according to the signal from the temperature setting device 11 by mixing and supplying water from the water circuit 8 that does not pass through the hot water heat source 1. This eliminates the need for adjustment operations to set the temperature using the mixing valve at the hot water supply terminal, and once the temperature is set, the temperature does not change even if the amount is adjusted by the faucet opening, greatly improving usability. Also, do not use too much hot water,
Not only does this reduce the loss of hot water during the adjustment time by 4jjQ, but it also has great energy-saving effects, such as less heat dissipation loss from the piping compared to when high-temperature hot water is supplied.

Note that the hot water heat source 1 is not limited to a hot water storage type, and the same effect can be expected even if it is an instantaneous hot water heater.

In addition, compared to conventional instant hot water supply systems in which the hot water temperature can be changed, the hot water temperature can be changed more quickly when the temperature setting is changed based on the water held in the heat exchanger or the heat capacity.

Further, in the present invention, as the flow rate ratio control valve 9, valves 17, 17', etc. of the same structure are provided independently in the sprue passage 7 and the water circuit 8, and are driven by motors 18, 18', etc. of the same structure. This has the advantage that the same parts can be used on the hot water side and the water side, and can be provided at low cost. Furthermore, the hot water side valve 17, water side valve 17', etc. are used to adjust the flow rate ratio of hot water and water.
The mixed water temperature can be adjusted by moving the hot water side valve 17 in the opening direction and the water side valve 18 in the closing direction, or by fixing one side and moving the other. A high degree of freedom in control is possible by adjusting the flow rate, moving in the same direction to maintain a constant mixed water temperature while changing the hot water supply flow rate, or closing both to stop hot water supply. . Stopping hot water supply 11. In addition, due to natural cooling, hot water from the hot water supply heat source 1 flows back through the water circuit 8 from the hot water circuit 7 through the flow ratio control valve 9 and naturally circulates, thereby promoting cooling of the hot water in the hot water storage tank 3. Although this phenomenon occurs, this can be prevented by closing the hot water side valve 17, the water side valve 17', or both. Furthermore, by keeping both the hot water side valve 17 and the water side valve 17' closed, it is possible to prevent the hot water in the hot water storage tank 3 from flowing backward and running out during a water outage or the like.

In the above embodiment, when the hot water side valve 17 and the water side valve 17' are provided as the flow ratio control valve 9 at the confluence of the hot water circuit 7 and the water circuit 8 downstream of the hot water supply heat source 1, the temperature sensor 13 and Since it is located near the flow ratio control valve 9, it has the advantage of being integrated as a temperature control device.

In addition, when the flow ratio control valve 9 is provided at the branch part between the hot water circuit 7 and the water outlet path 8 upstream of the hot water supply heat source 1, the hot water side valve 17, the water side valve 17', etc. do not receive heat, so the material This has the effect of being advantageous in terms of selection and lifespan.

Furthermore, a temperature setting device is installed near the terminal of the hot water supply circuit 10,
By setting the temperature remotely, you can set the temperature wherever you want to use it.

In addition to the embodiments described in section 2, it is of course possible to provide the flow rate ratio control valve 9 shown in FIG. 1 at each terminal, or to provide it at a specific terminal.

Effects of the Invention As described above, the hot water supply temperature control device of the present invention provides the following effects.

(1) It is no longer necessary to adjust the temperature by mixing pulp at the hot water supply terminal, the temperature does not change even if the flow rate is adjusted using the faucet, and the speed is obtained by mixing hot water and water, resulting in good responsiveness, making it extremely easy to use. good.

(2) Not only does it eliminate over-flowing of hot water and loss of hot water during the adjustment time, but it can also be expected to reduce heat radiation loss from piping compared to when supplying high-temperature hot water, resulting in energy savings.

(3) Since there is no need to install a complicated mixing valve at the terminal, the terminal discharge port can be made simple, and since it is electrically controlled, the installation position of the operation part, valve part, and drive part can be freely set. , there is a great deal of freedom in design.

(4) The hot water circuit and water circuit are each equipped with a hot water side valve and a water side valve, and each is equipped with an electric drive means, allowing control operations such as mixed hot water temperature control, flow rate control, and hot water supply stop. can be performed widely.

(5) By closing each circuit with the hot water side valve and water side valve,
It is possible to reduce the natural heat dissipation of the hot water supply heat source and prevent backflow when water is cut off.

[Brief explanation of drawings]

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 stream ratio control valve, and Fig. 3 is a control block diagram of the same. Figures 4, 5, and 6 are cross-sectional views showing an embodiment of the flow rate ratio control valve, Figure 7 is a configuration diagram of a hot water supply system showing another example, and Figure 8 is a pressure regulator and a flow rate ratio control valve. ②It is a configuration sectional view showing an example in which a ratio control valve is integrated. 1...Hot water supply heat source, 7...Hot water circuit, 8.
...Water circuit, 9...Flow i1 (ratio control valve (
hot water side valve, water side valve, hot water side drive means, water control drive means), 10
...Hot water supply circuit, 11...Temperature setting device,
12... Controller, 13... Temperature detector, 17... Hot water side valve, 17'... Water side valve, 18 Le 1 side motor ( Hot water side drive means) 18'...
Water side motor (Water side egg weight 11 hand number c) ~ Figure 2 Figure 3 Figure 5 Figure 7 Figure 8

Claims (4)

[Claims] (1) A hot water side valve that controls the amount of hot water provided in the hot water circuit that passes through the hot water supply heat source, a hot water side driving means that electrically drives this hot water side valve, and a hot water side valve that controls the amount of water provided in the water circuit that does not pass through the hot water heat source. a water-side valve that electrically drives the water-side valve; a temperature detector that detects the mixed water temperature provided in the hot water supply circuit where the hot water circuit and the water circuit merge; and a controller that compares signals from the temperature detector and the temperature setter and controls the hot water side drive means and the water side drive means to control the flow rate ratio of hot water and water. Hot water temperature control device. (2) The hot water temperature control device according to claim 1, wherein a hot water side valve and a water side valve are provided at the junction of the hot water circuit and the water circuit downstream of the hot water supply heat source. (3) The hot water temperature control device according to claim 1, wherein a hot water side valve and a water side valve are provided at a branch part of the hot water circuit and the water circuit upstream of the hot water supply heat source. (4) The hot water supply temperature control device according to claim 1, characterized in that a temperature setting device is installed near a terminal of the hot water supply circuit to remotely set the temperature.