Photoelectric liquid sensor and water pump with same

Abstract

The invention relates to a photoelectric liquid sensor. The photoelectric liquid sensor is characterized by comprising a transmitting optical fiber and a receiving optical fiber which are bilaterally oppositely arranged at an interval, the outer end of the transmitting optical fiber and the outer end of the receiving optical fiber are led out of a fluid, a light-emitting diode used for lighting the transmitting optical fiber is arranged at the position, adjacent to the transmitting optical fiber, out of the fluid, the receiving optical fiber is capable of receiving the light transmitted by the transmitting optical fiber and transmitting the light to a photoelectric conversion module, a shielding piece capable of moving under the action of the fluid is arranged between the transmitting optical fiber and the receiving optical fiber, and whether the receiving optical fiber can receive the light transmitted from the transmitting optical fiber or not is determined by vertical motion of the shielding piece. The diameter of the transmitted light is quite small due to the features of the light transmitted by the fiber, the light can be sensed if only the shielding piece slightly moves by a distance, and sensitivity is quite high. Compared with a traditional magnetic water flow sensor, the photoelectric liquid sensor has the advantages of freeness from affection of external magnetic field, operation is stable, the fiber is less prone to damage, and the part easy to be damaged is the light-emitting diode which is quite convenient to maintain. The invention further relates to a water pump provided with the above sensor.

Description

technical field [0001] The invention relates to a photoelectric fluid sensor and a water pump with the sensor. Background technique [0002] The water flow switch is a kind of fluid switch. Taking the water flow sensor as an example, it is a sensor device that converts the water flow into an on-off electrical signal after reaching a certain flow rate. It can be used in electric water heaters, solar water heaters, air conditioners and other water systems. Water cycle control, water inlet and outlet control, water heating control, water pump switch control, solenoid valve on-off control or water outlet power off, water outlet power on control and other processes. It is used to detect whether the liquid in the pipeline is flowing and whether the flowing amount (flow rate, that is, the liquid flow pressure) meets the requirements, and at the same time rely on the switch electrical contact to output (provide) the on-off state of a signal. The equipment system judges the working ...

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Problems solved by technology

[0004] The existing water flow switch has the following defects: 1. The action of the magnet requires a certain stroke and time, so it is not sensitive enough; 2. It cannot work in an environment with a magnetic field, because the external magnetic field will cause the water flow switch to malfunction; 3. It requires a large initial kinetic energy to push the magnet to move. If the water flow switch is used in a water pump, the water flow switch cannot operate during the small water flow of the pump; 4. The reed switch is easy to damage, and the water flow switch is located in the pump casing as a whole 5. It cannot be used in the water environment with impurities, and the channel where the magnet slides is easily blocked by impurities, adsorbed and stuck; 6. The electrical performance is poor, and the safety cannot be guaranteed.

[0007] This kind of check valve only has a one-way valve structure on it. When the water pump is working, because of many circumstances, the water pumped up by the water pump contains a lot of impurities. If there are impurities accumulated in the opening and closing position of the valve, it will cause If the entire one-way valve is not closed tightly, the entire one-way valve will not be able to close, and the water in the pump body will flow back from the one-way valve port and damage the impeller and motor.

And the water diversion in the pump body will be lost. If there is no water diversion in the pump body of the self-priming pump, the self-priming pump will lose its self-priming function

The water pump is not working properly

In addition, when the valve port is opened, the check valve is fully open, and there is no cover at the valve port. When the pump is working, some hard impurities, such as small stones, will enter the pump casing through the check valve with the water flow and will hit the motor. The impeller, serious will damage the impeller

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