Protection device of material level switch

Abstract

The utility model discloses a protection device of a material level switch, which relates to the field of protection of material level switches and comprises a protection shell in threaded connection with a sensing rod part of the material level switch, the protection shell is of a hollow structure, a semicircular slot is formed in the lower half part of the protection shell, a first threaded hole is formed in the center of an end plate of the protection shell, and a second threaded hole is formed in the end plate of the protection shell. A second threaded hole and a third threaded hole are formed in the two ends of an end plate of the protective shell respectively, the inner wall of the second threaded hole is in threaded connection with one end of a first air pipe, the inner wall of the third threaded hole is in threaded connection with one end of a second air pipe, and a first air blowing pipe is integrally formed at the output end of the first air pipe. Through the arrangement of the protective shell, the first air blowing pipe and the second air blowing pipe, the impact of falling materials on the sensing rod part of the material level switch can be avoided, and meanwhile the problem that the detection result is inaccurate due to the fact that powdery materials are accumulated on the sensing rod part of the material level switch can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of protection of level switches, and specifically to a protection device for a level switch. Background Art

[0002] Level switches are commonly used instruments in industrial control processes. The reliability of level switches is very important for the safety of industrial control. The switches are often used for high and low level alarms, feeding control, preventing overflow of storage tanks, etc., which are all very important. The pressure and abrasion of materials will affect the service life of sensors. If materials adhere or accumulate on the sensors of capacitive level switches, solid tuning fork switches, etc. and are not cleaned in time, it will cause sensor damage or affect the reliability of measurement. Content of the Utility Model

[0003] The purpose of the utility model is to provide a protection device for a level switch in order to solve the problems in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A protection device for a level switch, including a protective shell threadedly connected to a sensing rod part of the level switch. The protective shell is of a hollow structure, and the lower half of the protective shell has a semi-circular slot. A first threaded hole is opened at the center of the end plate of the protective shell, and a second threaded hole and a third threaded hole are respectively opened at both ends of the end plate of the protective shell. The inner wall of the second threaded hole is threadedly connected to one end of a first air pipe, and the inner wall of the third threaded hole is threadedly connected to one end of a second air pipe. The output end of the first air pipe is integrally formed with a first blowing pipe, and the output end of the second air pipe is integrally formed with a second blowing pipe.

[0005] As a further scheme of the utility model: The input ends of the first air pipe and the second air pipe are connected to two output ends of a tee pipe. The input end of the tee pipe is connected with a connecting pipe, and the input end of the connecting pipe is connected to the output end of a solenoid valve. The input end of the solenoid valve is connected with an air inlet pipe.

[0006] As a further scheme of the utility model: The air inlet pipe is connected to an external air source through a pump, and the solenoid valve is electrically connected to a time relay through a wire.

[0007] As a further scheme of the utility model: The length of the first blowing pipe is greater than the length of the second blowing pipe.

[0008] As a further scheme of the utility model: A threaded connection head is integrally formed at the position where the level switch is threadedly connected to the first threaded hole.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. By setting up a protective shell, a first air blowing pipe, and a second air blowing pipe, it is possible to avoid the impact of falling materials on the sensing rod part of the level switch. At the same time, it can prevent powdered materials from accumulating on the sensing rod part of the level switch, thus avoiding the problem of inaccurate detection results. Brief Description of the Drawings

[0011] Figure 1 is a structural schematic diagram of the present utility model;

[0012] Figure 2 is a structural schematic diagram of the protective shell of the present utility model;

[0013] Figure 3 is a sectional structural schematic diagram of the protective shell of the present utility model.

[0014] In the figure: 1. Level switch; 2. Threaded connection head; 3. Protective shell; 4. Solenoid valve; 5. Time relay; 6. Air inlet pipe; 7. Connecting pipe; 8. Three-way pipe; 9. First air pipe; 10. Second air pipe; 11. Second air blowing pipe; 12. First air blowing pipe; 13. First threaded hole; 14. Second threaded hole; 15. Third threaded hole. Detailed Embodiment

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figures 1 to 3 , in the embodiment of the present utility model, a protection device for a level switch includes a protective shell 3 threadedly connected to the sensing rod part of the level switch 1. The protective shell 3 has a hollow structure, and the lower half of the protective shell 3 has a semi-circular groove. A first threaded hole 13 is provided at the center of the end plate of the protective shell 3, and a second threaded hole 14 and a third threaded hole 15 are respectively provided at both ends of the end plate of the protective shell 3. The inner wall of the second threaded hole 14 is threadedly connected to one end of the first air pipe 9, and the inner wall of the third threaded hole 15 is threadedly connected to one end of the second air pipe 10. The output end of the first air pipe 9 is integrally formed with a first air blowing pipe 12, and the output end of the second air pipe 10 is integrally formed with a second air blowing pipe 11. A threaded connection head 2 is integrally formed at the threaded connection position between the level switch 1 and the first threaded hole 13.

[0017] In this embodiment: When the device is installed, it is installed in an inclined state in the upper half of the silo, and the semi-circular slot of the protective shell 3 is located below. In this way, when feeding materials, the materials falling from top to bottom will not directly contact the sensing rod part of the level switch 1, but will contact the non-slot part of the protective shell 3, thus avoiding the impact of the falling materials on the sensing rod part and forming a protective effect;

[0018] After the materials, especially the powdery materials, enter the silo, due to the impact during falling, they will float upward. Some of the floating powdery materials will adhere to the sensing rod part of the level switch 1. At this time, by introducing air flow into the first air pipe 9 and the second air pipe 10 and entering the first blowing pipe 12 and the second blowing pipe 11 respectively, the air flow blown out from the first blowing pipe 12 and the second blowing pipe 11 acts on the surface of the sensing rod of the level switch 1, thereby blowing off the powdery materials adhering to the surface of the sensing rod and avoiding affecting the sensitivity of the feeding switch 1.

[0019] Please refer specifically to Figure 1 , the input ends of the first air pipe 9 and the second air pipe 10 are connected to the two output ends of the tee pipe 8. The input end of the tee pipe 8 is connected with a connecting pipe 7. The input end of the connecting pipe 7 is connected to the output end of the solenoid valve 4. The input end of the solenoid valve 4 is connected with an air inlet pipe 6. The air inlet pipe 6 is connected to an external air source through a pump. The solenoid valve 4 is electrically connected to a time relay 5 through a wire.

[0020] In this embodiment: By setting the running time and the stopping running time of the solenoid valve 4 and the pump through the time relay 5, the pump and the solenoid valve 4 are synchronously powered on and run. At this time, the air pump inhales external gas and inputs the gas into the solenoid valve 4 through the air inlet pipe 6. Then the gas enters the connecting pipe 7 through the solenoid valve 4, and then enters the first air pipe 9 and the second air pipe 10 through the tee pipe 8.

[0021] Please refer specifically to Figure 1 , the length of the first blowing pipe 12 is greater than the length of the second blowing pipe 11.

[0022] In this embodiment: Since the sensing rod part of the level switch 1 is relatively long, in order to avoid the problem that the blown air flow gradually weakens and leads to incomplete purging, the first blowing pipe 12 and the second blowing pipe 11 are used to purge two parts of the outer wall of the level switch 1 respectively to achieve a better purging effect.

[0023] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A protection device for a level switch, characterized in that, It includes a protective shell (3) threadedly connected to the sensing rod part of the level switch (1). The protective shell (3) is of a hollow structure, and the lower half of the protective shell (3) has a semi-circular slot. A first threaded hole (13) is provided at the center of the end plate of the protective shell (3), and second threaded holes (14) and third threaded holes (15) are respectively provided at both ends of the end plate of the protective shell (3). The inner wall of the second threaded hole (14) is threadedly connected to one end of a first air pipe (9), and the inner wall of the third threaded hole (15) is threadedly connected to one end of a second air pipe (10). The output end of the first air pipe (9) is integrally formed with a first blowing pipe (12), and the output end of the second air pipe (10) is integrally formed with a second blowing pipe (11).

2. The protection device of a material level switch according to claim 1, characterized in that, The input ends of the first air pipe (9) and the second air pipe (10) are connected to two output ends of a tee pipe (8). The input end of the tee pipe (8) is connected with a connecting pipe (7), and the input end of the connecting pipe (7) is connected to the output end of a solenoid valve (4). The input end of the solenoid valve (4) is connected with an air inlet pipe (6).

3. The protection device of a level switch according to claim 2, characterized in that, The air inlet pipe (6) is connected to an external air source through a pump, and the solenoid valve (4) is electrically connected to a time relay (5) through a wire.

4. The protection device of a level switch according to claim 3, characterized in that, The length of the first blowing pipe (12) is greater than the length of the second blowing pipe (11).

5. The protection device of a level switch according to claim 4, wherein, A threaded connection head (2) is integrally formed at the position where the level switch (1) is threadedly connected to the first threaded hole (13).

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