JPS586363A - Solar heat utilizing system - Google Patents

Abstract

PURPOSE:To make it possible to operate the titled system in a stabilized condition by maintaining the interior of the system at a constant pressure by a method wherein in an arrangement in which a supply water tank is connected to a jet pump in a bypass passage of a circulation pump through a check valve, a flow rate control valve is arranged between the check valve and the tank. CONSTITUTION:A heat exchanger 25 disposed in a heat accumulating tank 23 and a solar heat collector 24 are connected to each other through a feed pipe 27 provided with the circulation pump 26 and a feedback pipe 28. Further, a bypass passage 31 provided with the jet pump 30 are connected between the discharge side and the sucking side of the circulation pump 26 and the pump 30 is connected with the supply water tank 34 through the check valve 32. In the above system, the flow rate control valve 33 is interposed between the check valve 32 and the supply water tank 34. In operation, when the pressure in a pressure switch 29 reaches a set pressure at the time of circulation of water, the valve 33 is closed through a control box 40 until the pressure in the system drops, to thereby maintain the interior of the system at a constant pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides water supply through a check valve to a heat collection circulation circuit equipped with a solar heat collector, a heat storage tank, and a circulation pump, and a jet pump provided in a bypass path of the circulation pump. It is an object of the present invention to provide a control configuration that fully controls the water supply pressurizing function of the jet pump and maintains the pressure within the system pressure range in a solar heat utilization system in which tanks are connected.

The conventional solar heat utilization system is explained using Figure 2.
1 is a heat storage tank, 2 is a solar heat collector, a heat exchanger 3 is disposed in the heat storage tank 1, and a circulation pump 4 is disposed between the nuclear heat exchanger 3 and the solar heat collector 2. Installed feed pipe5. And, piping is provided by a return pipe 6. Note that a pressure cutter γ is disposed in the inlet-1 side feed pipe 6 of the solar heat collector 2. The disconnected circulation pump 4 is connected to an air passage 10 in which a shelving pump 8 and a solenoid valve 9 are arranged. are connected. 13 is water tank 1
Water level switch installed in 2.

A valve 14 and a safety valve 15 are provided on the suction side of the broken circulation pump 4. 16.17 is a temperature sensor,
18 is a control box, and the temperature sensor 16.1
7 detection of temperature difference (circulation pump 4 is operated at ~.19
is a water supply pipe, and a pressure reducing valve 20 is connected thereto. 21 is a hot water supply pipe, and 22 is a drain. Note that the pressure of the pressure gauge Sinogua is set to a pressure equal to or lower than 1 pressure of the surface of the solar heat collector 2.

To explain the operation of the conventional system configured in this way, with the valve 14 open and the safety valve 16 fully open, the water supply tank 12 is filled with heat medium (~, circulation port/
When the pump is operated, the heat medium in the water supply tank 12 flows into the feed pipe 5 side and also flows into the bypass passage 10. By the action of the jet pump 8, the heat medium in the water supply tank 12 is supplied into the unit. Ru. At this time, the pressure cutter is in an ON state because the system internal pressure is low, and the solenoid valve 9 (rj) linked to the pressure cutter is in an open state.

After confirming that the heat medium has been discharged from the safety valve 16 in the open state and that the system is full of water, the safety valve 1 is closed.
By fully closing valve 6 and opening valve 14, circulation within the stem is started.

During circulation, the flow of the heat medium discharged from the circulation pump 4 is as follows:
Since it flows not only to the solar heat collector 2 side but also to the jet pump 8, the heat medium in the water tank 12 is pressurized into the system by the pressurizing action of the jet pump 8. Then, when the pressure at the mounting position of the pressure switch 7 of the feed pipe 5 reaches the set pressure of the pressure switch 7, the pressure switch 7 is turned OFF, and the solenoid valve 9 linked thereto is closed. Become.

When the solenoid valve 9 reaches the closed state, the water supply pressurizing action of the Genotopo/pump 8 is stopped, and the heat collection circulation operation is performed in the system under pressure. When the pressure inside the stem decreases during use for a very long time, the total pressure sensor detects it and turns on, opening the solenoid valve 9. As a result, the water supply pressurizing action of the jet pump 8 works again, raising the system internal pressure, and heat collection circulation operation is performed at a stable pressure.

However, the conventional system had the drawbacks described in F because the electromagnetic valve 9, which is a flow rate control valve that controls the water supply pressurizing capacity of the jet pump 8, is disposed in the bypass path 1o.

<D Because it is affected by the discharge pressure of the circulation pump 4, for example, if the model of the circulation pump 4 is changed, the flow rate and pressure flowing through the bypass path 10 will also change (1), and the operation of the solenoid valve 9 will become unstable.

<11>... Since the electromagnetic valve 9 is disposed in the bypass path 10, the resistance of the bypass path 1o becomes large, and the flow 'fftl'r flowing into the jet pump 8 is reduced.

<The coolant inside the IID system will adhere to the solenoid valve 9, shortening its life.

The present invention eliminates all of the conventional drawbacks by disposing a flow control valve and a check valve in a series relationship between a water supply tank and a jet pump. This will be explained based on the diagram.

In FIG. 1, 23 is a heat storage tank, 24 is a solar heat collector, a heat exchanger 26 is disposed inside the heat storage tank 23, and the heat exchanger 25 and the solar heat collector 24 are Piping is provided by a feed pipe 27 in which a circulation pump 26 is disposed, and a return pipe 28.

In addition, a pressure filter 29 is installed in the 1st side feed pipe 2 of the solar heat collector 240. Also, from the discharge side of the circulation pump 26 to the suction side, there is a bypass with a jet pump 30 installed. A water supply tank 34 is connected to the disconnected jet pump 3o via a check valve 32 and a solenoid valve 33'ff, which is a flow control valve.36 is a water supply tank 34. This is the water level switch that was found inside.

A valve 36 and a safety valve 37 are provided on the suction side of the circulation pump 26. 38.39 is a temperature sensor, 4
0 is a control box, and the temperature sensor 38, 39
The circulation pump 26 is operated upon detection of the temperature difference. 41 is a water supply pipe, and a pressure reducing valve 42 is used to distribute grain. 43 indicates a hot water pipe, and 44 indicates a drain. Note that the pressure gauge 29 is set to be lower than the withstand pressure of the solar heat collector 24.

To explain the entire operation in the above configuration, close the pulp field,
When the water supply tank 34 is filled with a heat medium and the circulation pump 26 is operated with the safety valve 37 open, the water supply tank 34
The heat medium inside flows to the feed pipe 2 end side, and the bypass path 3
1, and by the action of the jet pump 30, the heat medium in the water supply tank 34 is supplied into the system. At this time, the pressure switch 29 is turned ON because the pressure inside the system is low.
The solenoid valve 33 linked to the pressure cutter inlet 29 is in the open state. After confirming that the heat medium is discharged from the safety valve 37 in the open state and the inside of the stem 7 is filled with water, the safety valve 37 is closed and the valve 3 is closed.
6 starts circulation in the system. During circulation, the flow of the heat medium discharged from the circulation pump 26 flows not only to the solar heat collector 24 side but also to the jet pump 30 side. The medium is solenoid valve 3
3. Water is supplied into the system via a check valve 32. Thereafter, when the pressure at the mounting position of the pressure switch 29 of the feed pipe 27 reaches the set pressure of the pressure gas inlet 29, the pressure gas inlet is turned OFF, and the solenoid valve 33 linked thereto is turned off.
becomes a closed state.

In this way, when the solenoid valve 33 is closed, the water supply from the water tank 34 to the Geno pump 30 is stopped.
Inside the system, heat collection and circulation operation is performed in a pressurized state. Further, when the system internal pressure decreases during long-term use, the pressure inlet 29 detects l- and turns on, opening the solenoid valve 33. As a result, the pressurizing action of the water supply from the pop 3Q works again, and the system is operated for heat collection and circulation at a stable pressure.

The present invention consists of a solar heat collector, a heat storage tank, a circulation pump, a heat collection circulation circuit, and a jet pump provided in a bypass path of the circulation pump, which is connected to a water supply tank via an inverse 1)-1 valve. In the utilization system, the following effects are provided by arranging the flow control valve and the check valve in series between the water supply tank and the Nenoto pump.

<D The flow control valve is disposed between the check valve and the water supply tank, and the pressure at the flow control valve pick-up position is equal to The position of the water supply tank remains constant due to the action of the water head, and there is no circulation flow from the circulation pump, so the flow rate control valve is not affected by the flow, and the size of the system is not affected by the size of the circulation pump. Therefore, the operation of the flow control valve is extremely stable.

Since the flow rate control valve is not in the bypass path, the flow resistance in the bypass path is reduced, and the capacity of the pump is reduced.
can be promoted to

<III> Since new heat medium always flows through the flow rate control valve, scale and the like do not take advantage of it, resulting in a longer service life.

<IY> The flow control valve and check valve are arranged in series, providing double safety against heat medium leakage to the outside of the system, increasing the reliability of the entire system.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the solar heat utilization system of the present invention, and FIG. 2 is a system configuration diagram showing a conventional solar heat utilization system. 23... Heat storage tank, 24... Solar heat collector, 26
...Circulation pump, 29...Pressure detector, 3
0... Shet pump, 31... Bypass path, 32... Check valve, 33... Solenoid valve (
flow rate control valve), 34...water supply tank. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 6? . 1 ] j tg l 6 1--te is・"1'-animal2f""π-mouth (11,,,22 II"1 word 11

Claims (1)

[Claims] In a solar heat utilization system comprising a heat collection circulation circuit including a solar heat collector, a heat storage tank, and a circulation pump, and a water supply tank connected via a check valve to a jet pump provided in a bypass path of the circulation pump, the water supply tank 7, disposing a flow control valve and the check valve in series between the jet pump and the jet pump;
A solar heat utilization/stem characterized in that the pressure inside the system is maintained at a constant pressure by controlling the water supply pressurization function of the jet pump.