CN200982879Y - Water level and temperature detection device of solar water heater - Google Patents

Abstract

The utility model relates to a water level and temperature detection device for a solar water heater, which relates to a water level and temperature measuring device for a solar water heater. The device utilizes the buoyancy of water and the principle of leverage, and is characterized in that it includes a shell, a circuit board, a temperature sensing element, a float, a lever and an electric signal converter. The head is equipped with a float, and the float is equipped with a temperature sensing element connected to the circuit board by a wire; the electrical signal converter includes a fixed contact and a movable contact, the fixed contact is arranged on the circuit board, and the movable contact is arranged on the short arm of the lever of the end. This solution realizes the detection of the water level of the water heater by using the buoyancy and leverage of the water, and the ingenious combination with the water temperature probe not only improves the corrosion resistance and service life of the detection device, but also more effectively ensures the accuracy of the detection signal sex and reliability. The utility model has a reasonable structure, is simple and effective, and the proposal opens up a beneficial prospect for the application of the technology and related technical fields.

Description

Water level and temperature detection device for solar water heater

technical field

The utility model relates to a water level measuring device for a solar water heater, in particular to a detection device for the water level of a solar water heater.

Background technique

Solar water heaters have become a facility that can benefit people most directly by using solar energy and saving energy, and have gradually been widely used and popularized. In view of solar water heaters, such as solar showers or water boilers, their structure is mostly a system device composed of heat collectors, water tanks, water pipes and user terminals, which are respectively installed indoors and outdoors. Generally, both the water tank and the heat collector are placed outdoors, while the user terminal is installed indoors, in order to observe the temperature and water level changes in the outdoor water tank conveniently indoors, so as to realize the adjustment and control of timely replenishment of the water tank , A device that can detect changes in water temperature and water level is installed in the water tank, and the device can realize automatic adjustment of water replenishment. At present, the commonly used water temperature detector uses a water temperature probe consisting of a detection tube, a temperature sensing element, a control circuit board, and a shield. The probe is placed at a fixed position in the water tank to detect and feed back the water temperature signal. There are two types of water level measuring devices:

1. Electrode device: It is an electrode device that uses the increase and decrease of the resistance value of the resistor to display the level of the water level. The device is placed in the water tank, and several resistors are connected in series and placed in a stainless steel tube (or conductive silica gel ), the conduction is conducted by the surface of each section of water. The disadvantage is that the device is all placed in the water tank, and the resistance value of the water is also different due to the difference in water quality, resulting in a large error display; second, it is easy to produce Scale and the influence of signal conduction after scaling, the service life is short.

2. Pressure sensor device: It is a pressure sensor device that converts the pressure of the water level into an electrical signal. It uses a device that converts water pressure into an electrical signal output. The disadvantage is that the end of the sensor is prone to scale and blockage. Secondly, it is also due to its high cost that affects popularization and application.

Due to the defects and deficiencies of the above-mentioned devices in varying degrees, such as poor reliability, poor corrosion resistance, short service life, and complex structure, the application of the detection device is limited to a certain extent.

Utility model content

The purpose of this utility model is to use the buoyancy of water and the principle of leverage to disclose a detection device for measuring the water level and temperature of a solar water heater. It includes housing, circuit board, temperature sensing element, float, lever and electric signal converter. The lever is provided with a fulcrum hinged with the housing. The end of the lever is provided with a float at the end of the long arm section. The temperature sensing element of the board; the electrical signal converter includes a fixed contact and a moving contact, the fixed contact is set on the circuit board, and the moving contact is set at the end of the short arm of the lever; the float is a hollow ball, and the fixed contact It is a plurality of conductive strips at intervals. The conductive strip is provided with wires connected to the circuit board. The movable contact is a shrapnel with elastic pressure. The shrapnel is tightly pressed and placed on the fixed contact. In the shell of the float; there is also a hollow tube in the shell, and a temperature sensing element is set at the end of the hollow tube; a sealing sleeve is provided at the junction of the shell and the lever, and the large mouth end of the sealing sleeve is placed in the shell, and the sealing sleeve The small end of the sealing sleeve is placed on the lever; the joint between the housing and the hollow tube is provided with a sealing sleeve, the large opening of the sealing sleeve is sleeved on the housing, and the small opening of the sealing sleeve is placed on the hollow tube; the sealing sleeve is a rubber tower set.

The detection device implemented according to this scheme realizes the detection of the water level of the water heater due to the use of the buoyancy of water and the principle of leverage, and is skillfully combined with the temperature sensing element, which not only improves the corrosion resistance and service life of the detection device, but also is more effective. The accuracy and reliability of the detection signal are guaranteed. The utility model has a reasonable structure, is simple and effective, and the proposal opens up a beneficial prospect for the application of the technology and related technical fields.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is another embodiment of the utility model.

Detailed ways

In conjunction with accompanying drawing 1, a kind of solar water heater lever type water level water temperature detection device is taken as an embodiment, and further detailed description is made. The water level and temperature detection device includes a box-type housing 1, a circuit board 4, a hollow ball-type float 3, a hollow tube-type lever 2 and an electrical signal converter. The hollow tube 2 is provided with a fulcrum 20 hinged with the housing 1, The fulcrum 20 is actually a pin connected to the housing 1. The hollow tube 2 is provided with an electrical signal converter at the end of its short arm section. The electrical signal converter includes a fixed contact 41 and a movable contact 21. The fixed contact The point 41 is fixed on the circuit board 4 by several spaced copper conductive strips, the conductive strip 41 is welded on the circuit board 4, the movable contact 21 is arranged on the end of the short arm section of the hollow tube 2, and the movable contact 21 is composed of The shrapnel of elastic pressure is made, and is connected with lead lead and is connected to the main control circuit, and the shrapnel 21 is tightly pressed and placed on the conductive strip 41 . The shell of the hollow ball 3 is also equipped with a temperature sensing element 7, and the temperature sensing element 7 has a wire connected to the control circuit. The water level and temperature detection device is installed on the top of the water tank of the water heater, the housing 1 is fixed outside the water tank, and the pipe 2 and the hollow ball 3 are placed in the water tank, then the hollow ball 3 floats on the water surface and descends and rises with the water surface. Swing up and drive the tube 2 to swing with the fulcrum 20 as the axis. At this time, the shrapnel 21 located at the end of the short arm section of the hollow tube 2 swings in an arc, and the conductive strip 41 placed on the circuit board 4 is spaced apart. In contact with each other, the shrapnel 21 and the conductive strip 41 have wires connected to the main control circuit respectively (the main control circuit that converts the physical signal of the water level drop and rise into an electrical signal is the prior art), thereby realizing the detection of the water level of the water heater. At the same time, the temperature sensing element 7 placed in the hollow ball 3 converts the water temperature into an electrical signal and transmits it to the control circuit through a wire. 6 is an external power lead. In order to ensure that the hollow tube 2 does not interfere with the joint of the shell 1 when it swings up and down, a certain movable gap must be provided at the joint between the shell 1 and the hollow tube 2. If the gap is not sealed, water leakage may occur Resulting in corrosion damage to the components inside the housing. For this reason, a rubber-made tower-shaped sealing sleeve 5 is provided at the junction. Due to the elasticity and stretchability of the rubber, this sleeve not only ensures the good sealing performance of the junction between the housing 1 and the hollow tube 2, but also provides The swinging of the hollow tube 2 provides the necessary flexibility. Shown by the dotted line in the figure is the state schematic diagram when the water level in the water tank drops.

Fig. 2 is another embodiment of the utility model for detecting water level and water temperature. In this embodiment, a water temperature probe consisting of a hollow tube 22 and a temperature sensing element 7 is installed in the housing 1. The hollow tube 22 can be bent into a right angle tube (also can be prefabricated into an arc tube or other shapes), Its purpose is to immerse the thermosensitive element 7 placed in the hollow tube in water so as to directly detect the actual water temperature. The temperature sensing element 7 has a wire connected to the control circuit.

Claims (7)

1. A solar water heater water level and temperature detection device, characterized in that it includes a housing, a circuit board, a temperature sensing element, a float, a lever and an electric signal converter, the lever is provided with a fulcrum hinged to the housing, and the lever is at the end of the long arm section The end is equipped with a float, and the float is equipped with a temperature sensing element connected to the circuit board by a wire; the electrical signal converter includes a fixed contact and a movable contact, the fixed contact is arranged on the circuit board, and the movable contact is arranged on the short arm of the lever end of the segment. 2. The water level and temperature detection device for solar water heater according to claim 1, characterized in that the float is a hollow ball, the fixed contact is a plurality of conductive strips at intervals, the conductive strip is provided with wires connected to the circuit board, and the movable contact is The shrapnel with elastic pressure, the shrapnel is tightly pressed and placed on the fixed contact, and the shrapnel is provided with a wire connected to the circuit board. 3. The water level and temperature detection device for solar water heater according to claim 1 or 2, characterized in that the temperature sensing element is arranged in the shell of the float. 4. The water level and temperature detection device for solar water heaters according to claim 1, characterized in that a hollow tube is provided in the casing, and a temperature sensing element is provided at the end of the hollow tube. 5. The water level and temperature detection device for solar water heaters according to claim 1, characterized in that a seal sleeve is provided at the junction of the housing and the lever, the large mouth end of the seal sleeve is sleeved in the housing, and the small mouth end of the seal sleeve is sleeved on leverage. 6. The water level and temperature detection device for solar water heaters according to claim 4, characterized in that a sealing sleeve is provided at the junction of the housing and the hollow tube, the large mouth end of the sealing sleeve is socketed in the housing, and the small mouth end of the sealing sleeve is sleeved. placed in a hollow tube. 7. The water level detection device for solar water heater according to claim 5 or 6, characterized in that the sealing sleeve is a tower-shaped sleeve made of rubber.

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