Liquid level sensor cleaning structure of sewage tank

Abstract

A kind of sewage tank liquid level sensor cleaning structure, including being set at the liquid level sensor observation frame of high liquid level and low liquid level outside sewage tank, the front end surface of the liquid level sensor observation frame is provided for observing the glass plate of liquid level and liquid level sensor, the upper end surface of liquid level sensor observation frame is provided with liquid level sensor, liquid level sensor is inserted into liquid level sensor observation frame vertically, the signal lead of liquid level sensor is connected with control system, the upper end of the left side of liquid level sensor observation frame is provided with gas path system, gas path system includes gas spray head the outlet of the gas spray head extends into liquid level sensor observation frame and is aligned with liquid level sensor, the rear end of gas spray head is connected with fixed pneumatic one-way check valve, the rear end of pneumatic one-way check valve is connected with the side end interface of three-way air connector and is fixed, the upper and lower ends of three-way air connector are respectively connected with fixed gas pipe, the gas pipe of upper end is connected with compressed air and is fixed, the gas pipe of lower end is connected with fixed pneumatic one-way check valve at low liquid level.

Description

Technical Field

[0001] This utility model relates to the field of sensors for sewage tanks, specifically to a cleaning structure for a liquid level sensor of a sewage tank. Background Technology

[0002] When the two sewage tanks A and B are automatically alternately suctioned (negative pressure suction) and discharged (positive pressure delivery), high and low liquid level sensors are required to provide signals to control the automatic operation of the system. Therefore, the reliability of the sensor signals is particularly important.

[0003] Because the sewage tank experiences alternating positive and negative pressures, and the medium is in a complex state, it contains a large amount of fibrous material (which is easy to entangle), grease (which is easy to adhere), stones, wood blocks, plastic bottles, sanitary napkins and other garbage. Furthermore, foam and water vapor are easily generated during the sewage suction operation, and the liquid surface is prone to boiling, which can easily cause the sensor to fail.

[0004] Commonly used liquid level sensors have some problems. For example, hydrostatic level gauges are greatly affected by changes in medium density; float (cylinder) level gauges are easily jammed by fibers; ultrasonic level gauges are easily affected by foam and steam in the tank; radar level gauges are expensive and fail when contaminated; electrode level sensors are prone to fiber entanglement and accumulation at the low-level electrode, which is difficult to clean; capacitive level gauges have no moving parts, have a simple structure, and are resistant to high temperature and pressure, but the probe is prone to scaling.

[0005] Therefore, a structure is needed that can clean the level sensor of the sewage tank. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a cleaning structure for a liquid level sensor in a sewage tank. This structure utilizes compressed air from the chassis to promptly blow away and remove deposits from the sensor surface, thereby ensuring the sensor maintains normal operation.

[0007] The purpose of this utility model is achieved by the following solution: a liquid level sensor cleaning structure for a sewage tank, including a liquid level sensor observation frame set at the high liquid level and low liquid level positions on the outside of the sewage tank. The front end of the liquid level sensor observation frame is provided with a glass plate for observing the liquid level and the liquid level sensor. The upper end of the liquid level sensor observation frame is provided with a liquid level sensor, which is vertically inserted into the liquid level sensor observation frame. The signal lead of the liquid level sensor is connected to the control system. An air circuit system is provided at the upper left side of the liquid level sensor observation frame. The air circuit system includes an air nozzle, a pneumatic one-way check valve, an air connector, and an air pipe. The outlet of the air nozzle extends into the liquid level sensor observation frame and is aligned with the liquid level sensor. The rear end of the air nozzle is connected and fixed to the pneumatic one-way check valve. The rear end of the pneumatic one-way check valve is connected and fixed to the side interface of the three-way air connector. The upper and lower end interfaces of the three-way air connector are respectively connected and fixed to the air pipe. The upper air pipe is connected and fixed to compressed air through a solenoid valve, and the lower air pipe is connected and fixed to the pneumatic one-way check valve at the low liquid level position.

[0008] The upper end of the liquid level sensor observation frame is vertically provided with a threaded seat. The inner side of the threaded seat is threadedly connected to the sensor mounting sleeve. The lower inner end of the sensor mounting sleeve is fixed to the liquid level sensor by a threaded connection.

[0009] The lower end of the air pipe in the air circuit system is connected and fixed to the pneumatic one-way check valve at the low liquid level via a 90° air connector.

[0010] The front end of the liquid level sensor observation frame is provided with a mounting base, and the glass plate is connected and fixed to the mounting base by multiple bolts.

[0011] The glass plate is an acrylic glass plate.

[0012] The front end of the liquid level sensor observation frame is racetrack shaped.

[0013] The advantage of this invention is that this cleaning structure can use compressed air to remove the deposits and dirt on the surface of the liquid level sensor, so that the liquid level sensor can work normally and prevent the liquid level sensor from failing. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of this utility model; Figure 2 This is a side sectional view of the structure of this utility model; Figure 3 This is a schematic diagram of the installation of the present invention and the sewage tank. Detailed Implementation

[0015] like Figures 1 to 3As shown, a liquid level sensor cleaning structure for a sewage tank includes a liquid level sensor observation frame 12 disposed on the outside of the sewage tank 13 at high and low liquid levels. The front end of the liquid level sensor observation frame 12 is provided with a glass plate 3 for observing the liquid level and a liquid level sensor 2. The front end of the liquid level sensor observation frame 12 is racetrack-shaped. A mounting base 9 is provided at the front end of the liquid level sensor observation frame 12, and the glass plate 3 is connected and fixed to the mounting base 9 by multiple bolts 8. The glass plate 3 is an acrylic sheet. A liquid level sensor 2 is disposed on the upper end of the liquid level sensor observation frame 12, and the liquid level sensor 2 is vertically inserted into the liquid level sensor observation frame 12. Vertical installation of the liquid level sensor 2 prevents fibrous materials from tangling. A threaded seat 10 is vertically disposed at the upper end of the liquid level sensor observation frame 12. The inner side of the threaded seat 10 is threadedly connected to a sensor mounting sleeve 11, and the lower inner end of the sensor mounting sleeve 11 is fixedly connected to the liquid level sensor 2 by a thread. The signal lead 1 of the liquid level sensor 2 is connected to the control system. An air path system is set at the upper left side of the liquid level sensor observation frame 12. The air path system includes an air nozzle 7, a pneumatic one-way check valve 6, an air connector, and an air pipe 4. The outlet of the air nozzle 7 extends into the liquid level sensor observation frame 12 and is aligned with the liquid level sensor 2. The rear end of the air nozzle 7 is connected and fixed to the pneumatic one-way check valve 6. The pneumatic one-way check valve 6 prevents sewage from entering the air pipe and causing blockage. The rear end of the pneumatic one-way check valve 6 is connected and fixed to the side interface of the three-way air connector 5. The upper and lower interfaces of the three-way air connector 5 are respectively connected and fixed to the air pipe 4. The upper air pipe 4 is connected and fixed to compressed air through a solenoid valve, and the lower air pipe 4 is connected and fixed to the pneumatic one-way check valve 6 at the low liquid level through a 90° air connector.

[0016] When the sewage discharge function is activated, the system automatically purges the high and low level sensors simultaneously (set time approximately 30 seconds) to remove adhering substances from the surface of the high level sensor and loosen the sediment around the low level sensor, facilitating the discharge of the sediment around the low level sensor with the sewage. When the pressure is <1 kPa after the tank is emptied and there is no low level signal (indicating that the tank is empty, there is a lot of adhering substances on the surface of the low level sensor, and the sensor is malfunctioning), the system automatically purges the sensor to remove the adhering substances from the sensor surface, restoring the sensor signal to normal.

[0017] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A cleaning structure for a liquid level sensor in a sewage tank, characterized in that: The system includes a liquid level sensor observation frame (12) located at the high and low liquid levels on the outside of the sewage tank (13). The front end of the liquid level sensor observation frame (12) is fitted with a glass plate (3) for observing the liquid level and the liquid level sensor (2). The upper end of the liquid level sensor observation frame (12) is fitted with the liquid level sensor (2), which is vertically inserted into the liquid level sensor observation frame (12). The signal lead (1) of the liquid level sensor (2) is connected to the control system. An air path system is located at the upper left side of the liquid level sensor observation frame (12), and the air path system includes an air nozzle (7). The pneumatic one-way check valve (6), air connector and air pipe (4) are provided. The outlet of the air nozzle (7) extends into the liquid level sensor observation frame (12) and is aligned with the liquid level sensor (2). The rear end of the air nozzle (7) is connected and fixed to the pneumatic one-way check valve (6). The rear end of the pneumatic one-way check valve (6) is connected and fixed to the side interface of the three-way air connector (5). The upper and lower interfaces of the three-way air connector (5) are connected and fixed to the air pipe (4) respectively. The upper air pipe (4) is connected and fixed to compressed air through a solenoid valve. The lower air pipe (4) is connected and fixed to the pneumatic one-way check valve (6) at the low liquid level.

2. The cleaning structure for the liquid level sensor of the sewage tank according to claim 1, characterized in that: The upper end of the liquid level sensor observation frame (12) is vertically provided with a threaded seat (10), the inner side of the threaded seat (10) is threadedly connected to the sensor mounting sleeve (11), and the lower end of the inner side of the sensor mounting sleeve (11) is fixed to the liquid level sensor (2) by a threaded connection.

3. The cleaning structure for the liquid level sensor of the sewage tank according to claim 1, characterized in that: The lower end of the air pipe (4) in the air circuit system is connected and fixed to the pneumatic one-way check valve (6) at the low liquid level through a 90° air connector.

4. The cleaning structure for the liquid level sensor of the sewage tank according to claim 1, characterized in that: The front end of the liquid level sensor observation frame (12) is provided with a mounting base (9), and the glass plate (3) is connected and fixed to the mounting base (9) by multiple bolts (8).

5. The cleaning structure for the liquid level sensor of the sewage tank according to claim 1, characterized in that: The glass plate (3) is an organic glass plate.

6. The cleaning structure for the liquid level sensor of the sewage tank according to claim 1, characterized in that: The front end of the liquid level sensor observation frame (12) is racetrack shaped.

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