JPS5981715A - Automatic mixing device for supply of hot water - Google Patents

Abstract

PURPOSE:To always secure a set temperature for hot water and to improve the efficiency of a hot water supply system by controlling both the supply of heat to an auxiliary heat source device and the heating capacity of said source device after detecting the hot water temperatures at a main heat source side and the hot water supply side. CONSTITUTION:A main heat source uses a heat collector A and a regenerative tank B of solar energy, and the hot water temperature of the main heat source and that of the hot water supply side are detected TS and TM, respectively. These detected temperatures are compared with a desired set hot water temperature 15 through a controller 16. Then changeover valves SV1 and SV2 are controlled together with the heating capacity H of an auxiliary heat source device 14 to feed the hot water of a desired temperature to a hot water supply path 12. If the hot water temperature of the main heat source is higher than the set level, the valves SV1 and SV2 are controlled for mixture with water F as shown solid-line arrows in the figure. While in case the hot water temperature of the main heat source is lower than the set level, the valve SV1 is controlled to heat up the hot water through the device 14 as shown by a dotted line arrow. Thus the hot water of a desired temperature is supplied to the path 12. In addition, the capacity H of the device 14 is also controlled by the controller 16 on the basis the detected TM hot water supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic mixing device for hot water supply, for example, an automatic mixing device used in a hot water supply system utilizing solar heat.

<Prior Art> In hot water heating systems that utilize solar heat, the heat collection situation is affected by the weather, so an auxiliary heat source device is required to keep the hot water temperature constant. Traditionally, an auxiliary heat source device was added to a solar hot water system to automatically generate hot water. In order to keep the 'A temperature constant, an automatic mixing valve was used. @
Figure 1 is a diagram of a hot water supply system using a conventional automatic mixing valve, and Figure 2 is a sectional view of the conventional automatic mixing valve.

In the figure, A is a heat collector, B is a heat storage tank, C is an auxiliary heat source device, D,
E is an automatic mixing valve, and F is an outlet channel. Automatic mixing valve D for hot water temperature in heat storage tank B that has just collected solar heat
t' When the temperature is lower than the set temperature (usually set at 45°C), hot water from the auxiliary heat source device enters connection port 1, and hot water from heat storage tank B enters connection port 2, as shown in Figure 2. enters, so they mix and flow to the connection port 3 on the outlet side. At this time, the sensor 4 on the outlet side detects the temperature of the sliding water, and if the temperature is higher than the set temperature, the sensor 4 expands outward, so the connecting port opening/closing disk 5 connected to it moves to the left. , reduce the amount of hot water from the connection port 1 on the auxiliary heat source device C side. When the temperature is lower than the set temperature, the sensor 4 contracts and moves to the right to reduce the amount of hot water from the connection port 2 on the heat storage tank B side and adjust the hot water temperature to a constant level. 6 is a set temperature adjustment knob.

However, when the temperature of the hot water from heat storage tank B is higher than the set temperature, it is necessary to mix the hot water temperature with water, and this cannot be adjusted with the automatic mixing valve D, so another individual automatic mixing valve is used as shown in Figure 1. E is required. Further, the valve E needs to be operated so as to operate only when the temperature of the hot water from the heat storage tank B is higher than the set temperature. That is, if this is not done, when the hot water from the heat storage tank B is lower than the set temperature, it will be mixed with the hot water from the auxiliary heat source device C and then further mixed with water at the valve E.

<Purpose> In view of the above points, the present invention is capable of dispensing hot water at a set temperature regardless of whether the temperature of the hot water in the heat storage tank (main heat source side) is higher or lower than the set temperature, and The purpose of the present invention is to provide an automatic mixing device for hot water supply that can improve the efficiency of the hot water supply system.

<Embodiments> Examples of the present invention will be described below based on the drawings. Fig. 3 is a diagram of a solar hot water supply system using the automatic mixing device according to the present invention, Fig. 4 is a circuit diagram of the control device of the automatic mixing device, Fig. 5 is a relay circuit diagram of the control device, and Fig. 6 FIG. 2 is a diagram showing an input/output characteristic curve of a comparison amplifier of the same control device.

In FIG. 3, components similar to those of the conventional system are indicated by the same reference numerals. In the figure, SVl is the first switching valve, which has a position that communicates the hot water inlet path 11 on the heat storage tank B side with the direct hot water path 13a that flows directly to the hot water outlet path 12 side, and a position that connects the hot water inlet path 11 and the auxiliary heat source device 14. It is possible to switch to a position communicating with the auxiliary hot water passage 13b passing through by opening/closing movement of a valve by an electric motor M1.

SV2 is a second switching valve, which is switched so that the hot water in the direct hot water path 13a and the water in the outlet path F are mixed and flowed into the hot water path 12 while adjusting the amounts by opening and closing movements of the valve by the electric motor M2. It will be done. These switching valves S1 and SV2 have a conventionally known structure. Soshi C said supplementary hot water path 13b
The other end side is directly connected to the hot water outlet path 12 via the auxiliary heat source device 14 . The auxiliary heat source device 14 has, for example, a built-in electric heater H (gas or oil may be used). Also, G is the control device, which is the heat storage tank B (main heat source side)
A first sensor TS (thermistor) that detects the water temperature,
A second sensor 7M (thermistor) for sensing the hot water temperature on the hot water outlet side, a variable resistor 15 for setting the hot water temperature, and a controller for controlling the switching valves S1 and SV2 based on signals from these. It consists of 16. The controller 1
6 includes a first comparison amplifier A1 that compares and amplifies the difference between the voltage from the first sensor TS that senses the hot water temperature on the heat storage tank side and the voltage from the variable resistor 12, and a second sensor 7M that senses the hot water temperature. a second comparator amplifier A2 and a third comparator amplifier A3 that compare and amplify the difference between the voltage caused by the variable resistor 15 and the voltage caused by the variable resistor 15; and a relay that controls the first switching valve SVI and the second switching valve SV2 by the first comparing amplifier A1. RY1, and a relay RY2.RY2 which controls the second switching valve SV2 by means of a second comparator amplifier. A relay RY4 is built in to adjust the heating capacity of the heater H via the regulator RY3 and the third comparison amplifier A3.

Next, to explain the operation with reference to FIG. 3, the setting variable resistor 15
Adjust the temperature to reach the desired hot water temperature.

For example, if the hot water temperature can be varied between 35.degree. and 55.degree. C. and the outlet temperature is desired to be 45.degree. C., the resistance to this temperature is adjusted by the variable resistor 15. The difference between the voltage from the first sensor TS that detects the water temperature in the heat storage tank B and the voltage from the variable resistor 15 is compared and amplified to drive the first switching valve SV1. When the water temperature in the heat-containing tank B is higher than the set temperature (45°C), the first sensor TS detects this, and the first switching valve SVl is switched to the position indicated by the solid line arrow via the first comparator amplifier A1 in the controller 16. and flow it to the second switching valve SV2. Therefore, it does not flow to the auxiliary heat source device 14.

Further, hot water from the heat storage tank B and water from the outlet channel F enter the second switching valve SV2. The second sensor 1 measures the mixed water temperature on the outlet side.
M detects the voltage, and compares the resulting voltage with the voltage from the variable resistor 15 using the second comparator amplifier A2 in the controller 16, and drives the second switching valve SV2 to open and close using the motor M2. In order to prevent hunting drive, the second comparator amplifier A2 has a dead zone near the set value I. That is, the second comparison amplifier A
The input/output characteristics of No. 2 have step-like characteristics as shown in FIG. 6(b). The second switching valve SV2 is not driven in the range where the temperature detected by the second sensor 1M is relative to the set temperature (for example, ±3°C), and when the temperature exceeds the upper limit of the above q range,
The motor M2 is driven to adjust the opening angle of the valve so that more water flows from the outlet channel F than from the heat storage tank B, and when it enters the range, the valve stops at that position. Mix in this state. If it still does not fall within the range from the upper limit, motor M2 continues driving, operates the valve so that the outlet side is fully open and the heat storage tank side is fully closed, and in this state, the motor is stopped using a micro switch, etc. You will have to wait for it to come within range.

Also, when the temperature is below the lower limit of the set range, the heat storage tank side works to cause more flow during this time, and when it enters the range, the valve stops at that position and mixes in that state. If it does not fall within the range from the lower limit, continue driving the motor M2, fully open the heat storage tank side,
The valve is operated to fully open the outlet side, and in that state, the motor is stopped using a microswitch, etc., and waits for the water to enter the range.

Next, when the water temperature in heat storage tank B is lower than the set temperature (45°C), the first sensor TS detects this, and the first comparison amplifier A
1, the first switching valve Svl is controlled so that the flow is as shown by the broken line arrow. That is, it does not flow to the second switching valve S V 2 but flows to the auxiliary heat source device 14 . The hot water temperature is detected by the second sensor 'FM, and the resulting voltage and variable resistor 15 are
A third comparator amplifier A3 in the controller 16 compares the voltage with that of the auxiliary heat source device 14 to change the heat source capacity of the auxiliary heat source device 14. For example, in the case of a heat source or electric water heater, change the applied voltage to change the power. When the temperature measured by the second sensor 1M is lower than the set temperature, the capacity of the auxiliary heat source device 14 is increased, and when the temperature is higher than the set temperature, the capacity is lowered to bring the hot water temperature to the set temperature.

Next, the operation of the control circuit diagram of the fourth z'Ta[ will be explained.

First, the setting variable resistor 15 is used to adjust the temperature at which hot water is desired to be tapped, so looking at the input side of the first comparative amplifier A1, the output side relay RY1 is driven. When the water temperature in heat storage tank B is higher than the set temperature, the first sensor TS
Since the resistance value becomes smaller, the voltage applied to the first comparator amplifier A1 becomes higher, and the comparator amplifier A1 excites the relay RYI. Then, the relay contact RYI will be applied to the terminal a side of the first switching valve Svl, and the flow of the first switching valve will flow as shown by the solid line arrow in FIG.

In addition, the terminal side of contact RYI' of relay RYI is relay RY'2. It is connected to the second switching valve SV2 via RY3. Since relay RY1 is now energized, contact R
Y(' is on the terminal a side.

The input/output characteristics of the first comparator amplifier A1 are those of a comparator as shown in FIG. 6(,). When the temperature of the second sensor 1M of the outlet channel 12 is high, the resistance value becomes small and the voltage becomes low, and when it is lower than the set value, the second comparator amplifier A2
) Excite only the 17th relay RY2. Therefore, contact RY2
is turned ON, the second switching valve SV2 applies voltage to the terminal a, the motor M2 is driven, and as shown in FIG. 3, more water flows through the second switching valve SV2 on the outlet channel F side. Second sensor 1M
When reaches the set value, relay RY2 is demagnetized, contact RY2 is turned OFF, motor M2 is stopped, and second switching valve S■2
will stop at that position.

On the other hand, when the mixed water temperature is lower than the set value, only relay RY3 is energized, relay contact RY3 is ONL, and second switching valve SV2
The motor M2 is driven, and at the third flash, the second switching valve SV2 allows more hot water from the heat storage tank side to flow. When the second sensor 1M reaches the set value, the relay RY3 is demagnetized, the contact RY3 is turned off, and the motor M2 is stopped, so the second switching valve S2 is stopped at that position. As shown in FIG. 6(I), the input/output characteristics of the second comparison amplifier A2 have a dead zone in which the output does not change with respect to the input, and this range is within the range of the relay RY2. With both RY3 and RY3 in a demagnetized state, the second switching valve SV2 is not driven and maintains its position.

Furthermore, when the hot water in the heat storage tank B is lower than the set temperature, the resistance value of the sensor TS increases, so the voltage entering the first comparator amplifier A1 is low, and the relay RYI remains demagnetized, and the relay contact RY1 becomes the first Since the voltage is applied to the terminal side of the switching valve Svl, the flow of the first switching valve flows as indicated by the broken line arrow in FIG. 3, and flows in series through the auxiliary heat source device 14. And Deyuro 12
If the temperature of the second sensor TM is lower than the set value, the resistance value will be abnormal and the voltage entering the third comparator amplifier A3 will be large, resulting in a large output signal. Before that, since the relay RYI remains demagnetized, the contact RYI' is on the terminal side (#i and #'), and the relay RY4 is energized. Therefore, the third comparator amplifier A3
The output contact RY4 is ON.

If the auxiliary heat source device 14 is an electric water heater, the voltage applied to the heater H, which is the heat source, is increased via the regulator 17, and when the hot water temperature is low, the applied voltage is increased to increase the capacity of the auxiliary heat source device 14. When the water temperature increases, lower the applied voltage, lower the capacity, and adjust the hot water temperature to a constant value. The input/output characteristics of the third comparison amplifier A3 are shown in Figure 6(c).
It has the following characteristics.

Note that the present invention is not limited to a hot water supply system that utilizes solar heat as in the above embodiment, but may also be a hot water supply system that utilizes a pond heat source. Further, in the present invention, the auxiliary heat source device is not limited to an electric water heater, which is an electric heater as in the above embodiment, but may be a combustor using oil or gas as a heat source.

Effect> As is clear from the above description, the present invention is provided with a control device having a first sensor that senses the hot water temperature on the main heat source side and a second sensor that senses the hot water temperature on the outlet side. Based on a signal from the control device, when the temperature of the hot water on the main heat source side is higher than the set temperature, it flows to the outlet side without passing through the auxiliary heat source device, and when the hot water temperature on the main heat source side is lower than the set temperature, it passes through the auxiliary heat source device. A first switching valve is provided that switches the water to flow to the hot water outlet side, and a second switching valve operates to detect the hot water temperature on the hot water outlet side and mix the water when the temperature on the main heat source side is higher than the set temperature. The heating capacity of the auxiliary heat source device can be adjusted by a signal from the control device that detects the temperature on the hot water outlet side.

Therefore, according to the present invention, the hot water from the main heat source side is used preferentially, and the hot water from the auxiliary heat source side is used only when the hot water from the main heat source side is lower than the set temperature, and at that time it does not mix with the water. By keeping the temperature within the set range, you can improve the efficiency of your water heating system.

[Brief explanation of drawings]

Figure 1 is a diagram of a conventional solar hot water supply system, Figure 2 is a sectional view of the same automatic mixing valve, Figure 3 is a diagram of a hot water supply system showing an embodiment of the present invention, and Figure 4 is a control of the same control device. FIG. 5 is a circuit diagram of the same control device, and FIGS. A2. A3
FIG. 2 is a diagram showing the input/output characteristics of AI, A2. A3: Comparative amplifier, B: Heat storage tank, F: Outlet channel, G: Control S position, S v3, S V2: Off PA
Valve, TS, TM: sensor, 11: hot water inlet path, 12: hot water outlet path, 13a: direct hot water path, 131+: auxiliary hot water path, 14: auxiliary heat source device, 16 two controllers, 17 two regulators. Applicant Sharp Co., Ltd. Agent Tsunehisa Nakamura / / σ Figure 6 (8-8)

Claims (1)

[Claims] A control device is provided that has a first sensor that detects the temperature of hot water on the main heat source side and a second sensor that detects the temperature of hot water on the outlet side. When the temperature is higher than the set temperature, the hot water flows to the outlet side without passing through the auxiliary heat source device, and when the temperature of the main heat source side is lower than the set temperature, the first switching valve switches to flow the hot water to the outlet side through the auxiliary heat source device. A second switching valve is provided that operates to detect the hot water temperature on the hot water outlet side and mix water when the temperature on the main heat source side is higher than the set temperature, and the auxiliary heat source device An automatic mixing device for hot water supply, characterized in that its heating capacity can be adjusted by a signal from the control device that detects.