JPS599454A - Forced circulation type solar heat hot-water heater - Google Patents

Abstract

PURPOSE:To circulate water for avoiding freezing without reducing a water temperature in a hot-water reserving tank by a method wherein a path for bypassing water, flowed through the upstream side of a pump, is provided under a condition that the path is switched automatically only when the water temperature is lower than a freezing temperature. CONSTITUTION:The bypassing water path 15, flowing the water in second water path 5 through the upstream side of the pump 3 in the first water path 4 after bypassing a tank 1, and a rotary type solenoid valve 16, capable of switching a first condition, in which the water in the second water path 5 is flowed into the tank 1, into the second condition, in which the same water is flowed through the bypassing water path 15, are provided in this device. The detecting signal of a temperature sensor 14 is transmitted to a control circuit 17 for switching the solenoid valve 16 to switch the valve 16 automatically so as to maintain it in the second condition only when the water temperature is lower than the freezing temperature of the water.

Description

Detailed Description of the Invention The present invention provides an fPJ1 with a pump for supplying water in a hot water storage tank to a solar collector located above it.
The present invention relates to a forced circulation type solar water heater which is provided with a water channel and a second water channel reservoir for returning water from the solar collector f to the 67j storage tank.

In such water heaters, in order to avoid damage due to water freezing, the pump is driven even when the outside temperature or the temperature of the circulating water is below the freezing temperature of the water. Since the system circulates not only the water in the solar heat collector, but also the water in the hot water storage tank, there is an inconvenience that the water temperature in the hot water storage tank becomes unnecessarily low. In addition, in cold regions, etc., water heating heaters are operated in conjunction with the above-mentioned water circulation, but this requires a large heater to heat a large amount of water, including the water in the hot water storage tank. There were economic disadvantages in terms of equipment and energy.

The present invention has been made in view of the above-mentioned circumstances, and its first purpose is to prevent the water temperature in the hot water storage tank from lowering unnecessarily, and to do so without requiring special operations. The second purpose is to enable eζ water circulation to be carried out in order to avoid freezing even in a state where there is no freezing.In addition to the first purpose, the second purpose is to make it possible to completely avoid freezing even in cold regions etc. The main objective is to simplify the equipment and eliminate special operations.

This first issue is for the forced circulation solar water heater mentioned above.
11′ A detour waterway t is provided to cause water in the second waterway to bypass the tank and flow to a portion of the first waterway above the pump, and the water in the second waterway is directed to the tank. A valve capable of switching between the first flow chamber to flow and the second flow to the detour river waterway is operated to adjust the outside temperature or It is characterized in that the switching operation is automatically performed to maintain the second state only when the water temperature is 1"K near the freezing temperature of the water.

Next, the effects of the characteristic groove bottom of the first invention will be described.

In other words, water is circulated by bypassing the hot water tank through the detour waterway to avoid freezing, so it is possible to prevent the water temperature in the hot water tank from becoming unnecessarily low. Based on the information from the detection sensor, the valve is automatically switched to maintain the second state only when the outside temperature or water temperature is at a temperature T: close to the water freezing temperature. The above advantages can be obtained without requiring any operations.

The second invention provides the above-mentioned forced circulation solar water heater,
The water in the second waterway is diverted from the tank to the first water channel.
A detour waterway is provided in the waterway on the upper side of the pump, and the water in the second waterway is made to flow into the tank! Based on information from a temperature detection sensor that detects the outside air temperature or the temperature of the circulating water,
A valve for heating the circulating water in the second state of the valve, which is automatically switched to maintain the second state only when the outside air temperature or the water temperature is below a temperature near the freezing temperature of the water; The heater is arranged to be automatically activated and deactivated based on information from the temperature detection sensor so as to maintain the heating function only when the outside air temperature or the water temperature is below a temperature near the freezing temperature of the water. It is characterized by

Next, feature 1 of the book@2 invention! The effects of the a configuration will be described.

That is, the same advantages as the first invention can be obtained, and in addition, a heater for heating the circulating water can be provided so that it can be used even in cold regions. 111i In fact, in order to avoid freezing, the heater can be made small enough to heat a small amount of water excluding the water in the hot water storage tank, which saves equipment and energy costs. It is possible to achieve north-south economic efficiency, and based on information from temperature detection sensors, the heater automatically operates to maintain the heating state only when the outside air temperature or water temperature is below the freezing temperature of the water. Since the device is configured to perform a stop operation and a stop operation, special operations can be omitted.

Next, an embodiment of the present invention will be described based on all the drawings.

As shown in Figure 1, a first water channel (4) with a vane-type pump (3) for supplying water in the open hot water storage tank +1 to the solar collector (2) located above it.
A second water channel (5) is provided for returning water from the solar collector (2) into the hot water storage tank (1), and a pipe (6) for supplying water into the hot water storage tank (11) is provided. ), a pole tap valve +71 that automatically opens and closes its outlet, and a pump that supplies the water in the hot water tank +11 to various devices (
8) with a hot water pipe (917ke), which constitutes a forced circulation solar water heater.

A control circuit (11) for driving the electric motor (lO) for the pump (3) includes a high temperature thermistor (12) for detecting the water temperature in the upper part of the solar collector (2), and a high temperature thermistor (12) in the hot water storage tank (1). transmitting the detection signals of each of the low-temperature thermistors (13) that detect the water temperature of the solar heat collector (2), and the detection signals of the temperature detection sensors (for example, thermistors) 14) that detect the water temperature of the solar heat collector (2);
Both thermistors u'4. When the difference between the detected temperatures of irl exceeds the set range, the motor (10) is automatically activated, and when the difference between the detected temperatures of irl and irl is within the set range, the motor 1111 (lO) is automatically activated. Furthermore, even when the temperature detection sensor (14) detects that the water temperature is FK higher than the water temperature near the freezing temperature, the pump (3) is activated to avoid freezing. There is a gap between the two.

A detour waterway (lfi) is provided for causing water in the second waterway (6) to bypass the tank il+ and flow to a portion of the first waterway (4) above the pump (3); A rotary solenoid valve (16) that can be switched between a first state in which water in the waterway (5) flows to the tank (1) and 12 states in which water flows to the detour waterway (15).
The voltage transmits the detection signal of the temperature detection sensor α to the valve (switching control circuit 07 of 16I), and when the water temperature is below the freezing temperature of the water, the valve (switching control circuit 07 of 16I) In the second state of the valve (11), the heater u~ for heating the circulating water is connected to the first water channel (4). ) is provided in the auxiliary tank (I9), and the control circuit IJ' for operating the heater is
? ) (combined with the valve control circuit), transmits the detection signal of the temperature detection sensor (14), and enters the heating operation state only when the water temperature of the heater 01Gk is PK above the water freezing temperature. 19) The device is configured to automatically start and stop as desired.

In carrying out the present invention, the temperature detection sensor (14)
It may be configured to detect the outside temperature.

Furthermore, various changes can be made to the operation mechanism for turning on and off the pump U1, such as manually starting and stopping the pump (3) at appropriate times.

[Brief explanation of drawings]

The drawing is a schematic diagram showing an embodiment of a forced circulation solar water heater according to the present invention. fl+...Hot water storage tank, (2)...Solar heat collector, (3)...Pump, (4)...
...First waterway, (6) ...Second waterway, (1
4)...Temperature detection sensor, 05)...
・Detour waterway, (gull...valve, α~...
heater.

Claims (1)

[Claims] ■ A pump (3) for supplying water in the hot water storage tank (1) to the solar collector (2) located above it.
A forced circulation solar water heater, which is provided with a first water channel (4) with a water heater and a second water channel (6) for returning water from the solar collector (2) to the storage tank ix). In addition, a detour waterway 05) is provided for causing the water in the second waterway (5) to bypass the tank +11 and flow through a portion V of the first waterway (4) above the pump (3). , the water in the second waterway tfit is drained from the tank. (1) and the detour waterway (I6).
A temperature detection sensor (14) that detects the outside air temperature or the temperature of the circulating water for the valve that can be switched to the wS2 state where the water flows to the
Based on the information, the temperature is automatically changed to maintain the second state only when the outside air temperature or the water temperature is below a temperature close to the freezing temperature of the water. Forced circulation solar water heater. ■ A pump (3) for supplying 2,111 yen of stored water to the solar collector (2) located above it.
A forced circulation solar water heater, which is provided with a first water channel (4) and a second water channel (5) for returning water from the solar collector (2) into the storage tank ill, A detour waterway u that detours water in the second waterway (5) to the tank (ll-) and flows to a portion of the first waterway (4) above the pump (3);
5), and a first state in which the water in the second waterway (6) flows into the tank Tll and the detour waterway (
15) The valve end, which can be switched to the second closed connection that allows the flow to flow, is set to a temperature near the freezing temperature of the water, based on the information from the temperature detection sensor that detects the outside air temperature or the temperature of the circulating water. The temperature detection sensor ( Based on the information in 14), it is determined that the device is designed to be operated and stopped manually in order to maintain the heating effect only when the outside air temperature or water temperature is below the freezing temperature of the water. A forced circulation solar water heater.