CN206361982U - A kind of solar water heater water pipe protection device - Google Patents

Abstract

The utility model discloses a kind of solar water heater water pipe protection device; including single-chip microcomputer, n temperature sensor, m roots heating resistance wire, controlling switch and power supply; wherein; n, m are natural number; n temperature sensor is laid on water inlet pipe and the water outlet pipe surface that solar water heater is located outside respectively, is respectively used to sense the temperature of inlet tube and outlet tube and sends into single-chip microcomputer；M roots heating resistance wire is laid on water inlet pipe and the water outlet pipe surface that solar water heater is located outside respectively, and this m roots heating resistance wire connects power supply through controlling switch；Single-chip microcomputer is connected with controlling switch, the closure of the temperature control controlling switch sensed according to temperature sensor or disconnection.Such a protection device can expand the use scope of solar water heater, even if can also meet demand of the people to hot water in the winter time.

Description

A solar water heater water pipe protection device

technical field

The utility model relates to a solar water heater, in particular to a water pipe protection device for the solar water heater.

Background technique

A solar water heater is a device that converts sunlight energy into heat energy, and heats water from low temperature to high temperature to meet the needs of hot water in people's life and production. Solar water heaters are divided into vacuum tube solar water heaters and flat plate solar water heaters according to their structure, and vacuum tube solar water heaters are the main ones, accounting for 95% of the domestic market share. Vacuum tube household solar water heaters are composed of heat collecting tubes, water storage tanks, brackets and other related parts. The conversion of solar energy into heat mainly depends on vacuum heat collecting tubes. reach the required hot water. With the different needs of people in different regions, in order to improve the scope of application of solar water heaters, solar water heaters have been upgraded on the traditional basis. Solar water heaters add photovoltaic power generation devices and rely on ~220v mains auxiliary heating and other such solar water heaters.

Traditional water heaters mainly rely on sunlight to heat cold water. However, due to the influence of light and seasons, it is often difficult to meet the needs of users for hot water in rainy days and winter when there is insufficient light. Therefore, in order to make solar water heaters more widely applicable, traditional solar water heaters A heating rod device has been added inside the water heater, and an auxiliary power supply device has been added outside. For example, add an independent photovoltaic power generation device. When the light is sufficient, the solar water heater relies on the light to heat the cold water in the storage tank. At the same time, the solar panel generates electricity and stores it in the battery. The stored electrical energy heats the heating rods inside the solar water heater to reach the desired temperature. Another kind is to utilize household circuit 220V mains electricity to assist solar water heater heating, when natural light cannot heat the water in the water storage tank, then utilize domestic 220V alternating current auxiliary heating. Refer to Figure 3 for details.

Although the structure of the solar water heater has been upgraded, the auxiliary heating device can be used to heat water in rainy days and when the amount of sunlight in winter is not enough. However, the weather in the north is cold in winter. The temperature is low, although the inlet and outlet pipes of the solar water heater are protected against freezing by wrapping them with thermal insulation film, but when the outside temperature is low, the protection against freezing of the water pipes has little effect. This situation often occurs in winter in the north. The water inside the outdoor solar water heater has been heated. Due to the low temperature, the residual water inside the outdoor water inlet pipe and outlet pipe is often frozen in winter, resulting in the hot water inside the solar water heater not being released, and the cold water outside. If not, the water pipes will be severely frozen and cracked, which will not only affect the normal use of hot water by users, but also bring economic losses.

Utility model content

The purpose of the utility model is to provide a solar water heater water pipe protection device, which can expand the application range of the solar water heater, and can satisfy people's demand for hot water even in winter.

In order to achieve the above object, the solution of the present utility model is:

A water pipe protection device for a solar water heater, comprising a single-chip microcomputer, n temperature sensors, m heating resistance wires, a control switch and a power supply, wherein, n and m are natural numbers, and the n temperature sensors are respectively laid in the outdoor entrance of the solar water heater. The surface of the water pipe and the water outlet pipe are respectively used to sense the temperature of the water inlet and outlet pipes and send them to the single-chip microcomputer; m pieces of heating resistance wires are respectively laid on the surface of the water inlet pipe and the water outlet pipe of the solar water heater located outside, and the m heating resistance wires are passed through The control switch is connected to the power supply; the single chip microcomputer is connected to the control switch, and the closing or opening of the control switch is controlled according to the temperature sensed by the temperature sensor.

The above n temperature sensors are equidistantly arranged on the water inlet pipe and the water outlet pipe.

The above temperature sensor adopts DSB18B20 temperature sensor.

The above-mentioned control switches are provided with m pieces, and after the m heating resistance wires are connected in parallel with each other, they are respectively connected to the power supply, and the m control switches are correspondingly connected between the m heating resistance wires and the power supply.

After the above m heating resistance wires are connected in series, they are connected to a power supply through a control switch.

The above m heating resistance wires are divided into groups, each group is connected in series with each other, and then connected to a power supply through a control switch.

The above-mentioned one-chip computer adopts AT89C51.

The above-mentioned power supply adopts photovoltaic power generation batteries or rectified 220V mains electricity.

The above-mentioned control switch uses a relay, and the contacts of the relay are connected in series in the circuit of the power supply and the heating resistance wire. The output pin of the single-chip microcomputer is connected to the base of the triode through a resistor, the emitter of the triode is grounded, and the collector of the triode is connected to the power supply through the relay coil.

The two ends of the above-mentioned relay coil are also anti-parallel diodes.

After adopting the above scheme, the utility model lays temperature sensors and heating resistance wires on the surface of the outdoor water inlet pipe and outlet pipe of the solar water heater, and monitors the temperature of the water pipe in real time to determine whether it is necessary to heat the water pipe. Solar water heaters, such as solar water heaters with independent photovoltaic power generation devices or auxiliary heating using 220V mains electricity, are not suitable for traditional solar water heaters that rely entirely on sunlight for heating. The utility model adopts a multi-point temperature monitoring system, which has stable and reliable operation, strong anti-interference ability, and can ensure the accuracy of temperature measurement.

Description of drawings

Fig. 1 is a flow chart of the utility model;

Among them, A-terminal;

Fig. 2 is the realization circuit diagram of the utility model;

Fig. 3 is the structural schematic diagram of the existing upgraded solar water heater;

Among them, (a) represents the structural schematic diagram of the upgraded solar water heater, (b) represents the circuit diagram assisted by 220V mains power, and (c) represents the circuit diagram assisted by the battery;

Among them, B-temperature and water level detection, 10-heating rod, 20-photovoltaic battery, 3-water inlet pipe, 4-water outlet pipe, D-input end, UO-output.

detailed description

The technical solutions and beneficial effects of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the utility model provides a solar water heater water pipe protection device, including a single-chip microcomputer, n temperature sensors 1, m heating resistance wires 2, control switches and power supply, wherein, n and m are natural numbers, as follows Introduce separately.

n temperature sensors are respectively laid on the surface of the water inlet pipe 3 and the water outlet pipe 4 of the solar water heater, which are respectively used to sense the temperature at different positions of the water inlet and outlet pipes, and are sent to the single-chip microcomputer. In order to ensure that the water inlet and outlet pipes can All are detected, and the cost is reduced, and n temperature sensors are equidistantly arranged on the water inlet pipe and the water outlet pipe. In this embodiment, the temperature sensor adopts DSB18B20 temperature sensor.

The m heating resistance wires are respectively laid on the surface of the water inlet pipe and the water outlet pipe of the solar water heater located outside, and the m heating resistance wires are connected to the power supply through a control switch. In the specific implementation, the m heating resistance wires can be connected to the power supply corresponding to a control switch, that is, the m heating resistance wires are connected in parallel, and each parallel branch is connected to a control switch, which can also reduce the cost. , after all the heating resistance wires are connected in series, the power supply is connected through the control switch, and the m heating resistance wires can be grouped. After the heating resistance wires of each group are connected in series, the power supply is connected separately. Three sections, the same group of heating resistance wires are laid on each section, so that the heating can be controlled according to the temperature of each section. When the temperature of a certain section of the water inlet pipe is high, the heating resistance wire is not turned on, which is energy-saving and environmentally friendly.

The single-chip microcomputer is respectively connected with n temperature sensors and control switches. The single-chip microcomputer receives the temperature data from the temperature sensor and compares it with the threshold value (for example, setting the start threshold to 2°C and the stop threshold to 5°C). When the temperature of the water pipe is lower than the start threshold , to send a closing command to the control switch, and the corresponding heating resistance wire is energized to heat the water pipe, thereby increasing the temperature of the water pipe; Turn off electricity, stop heating, save electricity.

As shown in Fig. 2, it is the specific implementation circuit diagram of the present utility model, wherein, the single-chip microcomputer can adopt 51 single-chip microcomputers, the cost performance is high, and the anti-interference ability is strong; Low, strong anti-interference ability, high precision. Working power supply: 3.0～5.5V/DC, can use photovoltaic power generation battery or rectified 220V mains power. The whole system does not require any peripheral components in use.

A relay can be used to control the switch. As shown in Figure 2, the contacts of the relay are connected in series in the loop between the power supply and the heating resistance wire, and the relay coil KA is connected to the single-chip microcomputer. Specifically, the P2.0 pin of the single-chip microcomputer AT89C51 is connected to the triode through a resistor The base of the triode, the emitter of the triode are grounded, and the collector of the triode is connected to the power supply through the relay coil KA. At the same time, for circuit stability, a diode VD is connected in antiparallel to both ends of the relay coil KA.

When working specifically, a DSB18B20 temperature sensor is installed at a certain distance on the surface of the inlet and outlet pipes of the solar water heater, and heating resistance wires are laid on the surfaces of the inlet and outlet pipes. When the temperature is detected to be lower than 2°C, the temperature sensor will input signal, the P2.0 pin of the microcontroller outputs a low level, the relay coil KA is energized, the contact of the drive relay is closed, the heating resistance wire works, and the water pipe is heated; when the heating temperature is higher than 5°C, the heating is stopped to save power. At the same time, prevent the water pipe from being damaged by excessive temperature.

The above embodiments are only to illustrate the technical ideas of the utility model, and cannot limit the protection scope of the utility model with this. Any changes made on the basis of the technical solutions according to the technical ideas proposed by the utility model all fall into the scope of the utility model. within the scope of the new protection.

Claims (10)

1. a kind of solar water heater water pipe protection device, it is characterised in that：Including single-chip microcomputer, n temperature sensor, m roots hair Hot water radiation wire, controlling switch and power supply, wherein, n, m are natural number, and n temperature sensor is laid on solar energy respectively Water inlet pipe and water outlet pipe surface that water heater is located outside, are respectively used to sense the temperature of inlet tube and outlet tube and send into single-chip microcomputer；m Root heating resistance wire is laid on water inlet pipe and the water outlet pipe surface that solar water heater is located outside, and this m root heating electric respectively Hinder silk and connect power supply through controlling switch；Single-chip microcomputer is connected with controlling switch, the temperature control sensed according to temperature sensor The closure of controlling switch or disconnection.

2. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The n temperature is passed Sensor is placed equidistant on water inlet pipe and outlet pipe.

3. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The temperature sensor Using DSB18B20 temperature sensors.

4. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The controlling switch is set M, after m root heating resistance wires are parallel with one another are put, power supply is connected respectively, and m controlling switch correspondence is connected to m roots hair Between hot water radiation wire and power supply.

5. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The m roots heating electric Hinder after silk series connection, power supply is connected through controlling switch.

6. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The m roots heating electric Resistance silk is divided into array, after each group is serially connected, then connects power supply through a controlling switch.

7. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The single-chip microcomputer is used AT89C51。

8. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The power supply is adopted With photovoltaic generation battery or it is rectified after 220V civil powers.

9. a kind of solar water heater water pipe protection device as claimed in claim 1, it is characterised in that：The controlling switch makes With relay, relay contact is connected in the loop of power supply and heating resistance wire, and the output pin of single-chip microcomputer is via electricity The base stage of connecting triode is hindered, the grounded emitter of triode, the colelctor electrode of triode connects power supply via relay coil.

10. a kind of solar water heater water pipe protection device as claimed in claim 9, it is characterised in that：The relay line The two ends of circle also anti-paralleled diode.