Sealing cavity structure of liquid level float switch

Abstract

The utility model relates to the technical field of float switches, in particular to a liquid level float switch sealing cavity structure which comprises a reed switch and a floater, the floater is movably sleeved on the outer side of the lower end of the reed switch and comprises an outer cup, an inner cup is connected inside the outer cup in an inserted mode, and the upper end of the outer cup is connected and sealed through a cover plate. The reed pipe comprises a mounting structure at the upper end and a pipe body structure at the lower end, and a magnetic reed switch is arranged in the pipe body structure and corresponds to a floater arranged on the outer portion in a sleeving mode, and has the advantages that an inner cup is additionally arranged on the basis of an existing floater, the inner cup is reversely inserted into an outer cup in the mounting process and buckled with the outer cup, and the inner cup and the outer cup are connected and fixed through glue; the sealing cavity is formed between the cover plate and the floater, the floater can be effectively prevented from losing buoyancy due to water inflow caused by cracking of the cover plate, air in the sealing cavity can guarantee that the floater still has buoyancy after water inflow caused by cracking of the cover plate, the using effect of the floater is guaranteed, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of float switches, in particular to a sealed cavity structure of a liquid level float switch. Background Art

[0002] The operating principle of a float level switch is similar to that of a rod-type float switch, and it can also be called a miniature float level switch. As the name suggests, its main components are a magnetic float, a plastic or stainless steel stem, and an internal imported reed switch. Typically, one or more reed switches are installed as needed within a sealed non-magnetic metal or engineering plastic tube. A float with a built-in magnetic system is then fixed to the relevant position of the reed switch within the tube. The float moves up and down within a certain range, and the magnetic system within the float triggers the reed switch through the tube, generating a switching action to control the liquid level.

[0003] The float in the existing float liquid level switch is mainly formed by ultrasonic welding of a float cup and a cover plate. In normal use, this design has a service life of about three years. However, when used on some special equipment, due to changes in water temperature, the float welding gap will be affected, which may cause the float to crack (not sealed), and then water will enter the float, causing the float to lose buoyancy. Therefore, in order to improve the float structure, increase the buoyancy of the float, and avoid the problem of water entering the float due to cracking of the float, resulting in the float losing buoyancy, the utility model proposes a liquid level float switch sealed cavity structure to solve the above problem. Utility Model Content

[0004] The purpose of the present utility model is to provide a sealed cavity structure of a liquid level float switch to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: a sealed cavity structure of a liquid level float switch, comprising

[0006] A float, the float being movably sleeved on the outer side of the lower end of the reed switch, the float comprising an outer cup, an inner cup being plugged in and connected to the inner cup, and the upper end of the outer cup being sealed by a cover plate; and

[0007] The reed switch comprises a mounting structure at the upper end and a tube structure at the lower end. A magnetic reed switch is arranged inside the tube structure and corresponds to a float sleeved on the outside.

[0008] Preferably, the reed switch includes a mounting structure provided at the upper end, the mounting structure includes a mounting plate, fixing plates are protruding on both sides of the mounting plate, fixing holes are provided on the fixing plates, screws are connected in the fixing holes, and the mounting plate is fixed to the equipment by the screws, a sealing cover is fixedly provided at the lower end of the mounting plate, a slot is provided in the middle of the outer ring of the sealing cover, a sealing ring is sleeved in the slot, and several corresponding groups of slots and sealing rings are provided, which are evenly distributed up and down.

[0009] Preferably, the middle of the lower end of the sealing cover is fixedly connected to a main body tube, the interior of the main body tube is hollow, and the lower end is fixedly connected to a reed tube, a reed switch is provided inside the reed tube, a float is provided on the outside of the reed tube, and a limit cap is detachably connected to the lower end of the reed tube, and the limit cap is stuck at the lower end of the float to limit the float, the upper end of the reed switch is connected to a control line, the upper end of the control line passes through the main body tube and the mounting structure and is connected to the outer side of the upper end, and is connected to the controller.

[0010] Preferably, the float includes an outer cup with a hollow interior. The outer cup is annular and has a connecting hole corresponding to the reed tube formed in the middle. An air cavity is provided inside the outer cup. The inner cup is plugged into and fixed to the air cavity by gluing. The inner cup also has an annular structure and a closed cavity is provided inside the lower end of the inner cup. The inner cup is inverted inside the outer cup so that the closed cavity and the air cavity cooperate to form an airtight space with internal inflation, and a number of magnet structures corresponding to the reed switch in the reed tube are provided inside the float.

[0011] Preferably, an opening is provided at the upper end of the outer cup, and sealing grooves are provided at the upper ends of the side walls on both sides of the opening. The upper end of the opening is covered with a cover plate, and the lower end of the cover plate is provided with two sets of limiting rings corresponding to the openings. The limiting rings are inserted into the opening at the upper end of the outer cup and fit into the inner walls of the side walls on both sides. A sealing protrusion is also protruded from the lower end of the cover plate outside the limiting ring, and the sealing protrusion is inserted into the sealing groove and fixed by ultrasonic welding.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model adds an inner cup to the existing float. When installing, the inner cup is reversely inserted into the outer cup and buckled with the outer cup, and is fixed by gluing. A sealed cavity is formed between the two, which can effectively prevent the cover plate from cracking and water from entering, causing the float to lose buoyancy. The air in the sealed cavity can ensure that the float still has buoyancy after the cover plate cracks and water enters, thereby ensuring its use effect and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a float in the prior art;

[0015] Figure 2It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the float in the utility model;

[0017] Figure 4 This is a schematic diagram of the exploded structure of the float in the utility model.

[0018] In the figure: 1 reed switch, 2 float, 3 mounting plate, 4 control line, 5 sealing cover, 6 main tube, 7 reed switch, 8 limit cap, 9 outer cup, 10 air cavity, 11 inner cup, 12 cover plate, 13 connecting hole, 14 sealing groove, 15 closed cavity, 16 limit ring, 17 sealing protrusion. DETAILED DESCRIPTION

[0019] See also Figures 1 to 4 The utility model provides a technical solution: a liquid level float switch sealed cavity structure, including

[0020] The float 2 is movably sleeved on the outer side of the lower end of the reed switch 1. The float 2 includes an outer cup 9. The inner cup 11 is plugged into the outer cup 9. The upper end is sealed by a cover plate 12; and

[0021] The reed switch 1 comprises a mounting structure at the upper end and a tube structure at the lower end. A magnetic reed switch is provided inside the tube structure and corresponds to a float 2 provided outside.

[0022] The reed switch 1 includes a mounting structure provided at the upper end, and the mounting structure includes a mounting plate 3. Fixing plates are protruding on both sides of the mounting plate 3. Fixing holes are provided on the fixing plates. Screws are connected in the fixing holes, and the mounting plate 3 is fixedly connected to the equipment by screws. A sealing cover 5 is fixedly provided at the lower end of the mounting plate 3. A card groove is provided in the middle of the outer ring of the sealing cover 5. A sealing ring is sleeved in the card groove. Several corresponding groups of card grooves and sealing rings are provided, which are evenly distributed up and down. Through the mounting structure, the liquid level float switch can be fixedly connected to the equipment as a whole with screws to ensure installation stability. The sealing cover 5 can ensure the sealing effect of the connection between the liquid level float switch and the equipment to avoid leakage.

[0023] The middle of the lower end of the sealing cover 5 is fixedly connected to the main body tube 6. The interior of the main body tube 6 is hollow, and the lower end is fixedly connected to a reed tube 7. A reed switch is arranged inside the reed tube 7. The outer sleeve of the reed tube 7 is provided with a float 2. The lower end of the reed tube 7 is detachably connected to a limit cap 8. The limit cap 8 is stuck in the lower end of the float 2 to limit the float 2. The upper end of the reed switch is connected to the control line 4. The upper end of the control line 4 passes through the main body tube 6 and the mounting structure to be connected to the outer side of the upper end, and is connected to the controller. The reed tube 7 can be conveniently connected to the float 2 for movement. The float 2 is sleeved on the outer side of the reed tube 7 and limited by the detachable limit cap 8 so that its range of movement is only outside the reed tube 7. When the float 2 is supported by the buoyancy of the liquid and floats up, there will be no problem of excessive movement, which will affect the use effect of the reed switch.

[0024] The float 2 includes an outer cup 9 with a hollow interior. The outer cup 9 is annular and has a connection hole 13 formed in the middle corresponding to the reed tube 7. An air cavity 10 is provided inside the outer cup 9. An inner cup 11 is inserted into and fixed to the air cavity 10 by gluing. The inner cup 11 is also annular in structure and has a closed cavity 15 formed inside the lower end of the inner cup 11. The inner cup 11 is inverted inside the outer cup 9 so that the closed cavity 15 and the air cavity 10 cooperate to form an airtight space filled with air. A number of magnet structures corresponding to the reed switches in the reed tube 7 are provided inside the float 2.

[0025] An opening is provided at the upper end of the outer cup 9, and sealing grooves 14 are provided at the upper ends of the side walls on both sides of the opening. A cover plate 12 is provided on the upper end of the opening, and two sets of limiting rings 16 corresponding to the openings are provided at the lower end of the cover plate 12. The limiting rings 16 are inserted into the opening at the upper end of the outer cup 9 and fit into the inner walls of the side walls on both sides. A sealing protrusion 17 is also protruded from the lower end of the cover plate 12 outside the limiting ring 16. The sealing protrusion 17 is inserted into the sealing groove 14 and fixed by ultrasonic welding. By adding an inner cup 11 to the existing float 2, the inner cup 11 is reversely inserted into the outer cup 9 during installation and buckled with the outer cup 9, and fixed by adhesive connection. A sealed space is formed between the two, which can effectively prevent the cover plate 12 from cracking and water entering, causing the float 2 to lose buoyancy. The air in the sealed cavity can ensure that the float 2 still has buoyancy after the cover plate 12 cracks and water enters, thereby ensuring its use effect and extending its service life.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The sealed cavity structure of the liquid level float switch is characterized by: include A float (2), the float (2) being movably sleeved on the outer side of the lower end of the reed switch (1), the float (2) comprising an outer cup (9), an inner cup (11) being plugged into the inner portion of the outer cup (9), and the upper end of the float (2) being connected and sealed via a cover plate (12); and A reed switch (1) comprises a mounting structure at an upper end and a tube structure at a lower end, wherein a magnetic reed switch is provided inside the tube structure and corresponds to a float (2) sleeved outside the tube structure.

2. The liquid level float switch sealed cavity structure according to claim 1, characterized in that: The reed switch (1) includes a mounting structure provided at the upper end, the mounting structure including a mounting plate (3), fixing plates protruding from both sides of the mounting plate (3), fixing holes provided on the fixing plates, screws connected in the fixing holes, and the mounting plate (3) is fixedly connected to the equipment by the screws, a sealing cover (5) is fixedly provided at the lower end of the mounting plate (3), a card slot is provided in the middle of the outer ring of the sealing cover (5), a sealing ring is sleeved in the card slot, and a plurality of corresponding groups of card slots and sealing rings are provided, which are evenly distributed up and down.

3. The liquid level float switch sealed cavity structure according to claim 2, characterized in that: The middle of the lower end of the sealing cover (5) is fixedly connected to a main body tube (6), the interior of the main body tube (6) is hollow, and the lower end is fixedly connected to a reed tube (7), a reed switch is arranged inside the reed tube (7), the outer surface of the reed tube (7) is provided with a float (2), the lower end of the reed tube (7) is detachably connected to a limit cap (8), the limit cap (8) is stuck on the lower end of the float (2), and limits the float (2), the upper end of the reed switch is connected to a control line (4), the upper end of the control line (4) passes through the main body tube (6) and the mounting structure, is connected to the outer side of the upper end, and is also connected to a controller.

4. The liquid level float switch sealed cavity structure according to claim 1, characterized in that: The float (2) comprises an outer cup (9) with a hollow interior. The outer cup (9) is annular and has a connecting hole (13) corresponding to the reed tube (7) formed in the middle. An air cavity (10) is provided inside the outer cup (9). An inner cup (11) is inserted into and fixed to the air cavity (10) by gluing. The inner cup (11) also has an annular structure and a closed cavity (15) is provided inside the lower end of the inner cup (11). The inner cup (11) is inverted inside the outer cup (9) so that the closed cavity (15) cooperates with the air cavity (10) to form an airtight space filled with air. A plurality of magnet structures corresponding to the reed switches in the reed tube (7) are provided inside the float (2).

5. The liquid level float switch sealed cavity structure according to claim 4, characterized in that: The outer cup (9) is provided with an opening at the upper end, and sealing grooves (14) are provided at the upper ends of the side walls on both sides of the opening. The upper end of the opening is covered with a cover plate (12), and the lower end of the cover plate (12) is provided with two groups of limiting rings (16) corresponding to the openings. The limiting rings (16) are inserted into the opening at the upper end of the outer cup (9) and fit with the inner walls of the side walls on both sides. The lower end of the cover plate (12) outside the limiting ring (16) is also provided with a sealing protrusion (17) protruding therefrom. The sealing protrusion (17) is inserted into the sealing groove (14) and fixed by ultrasonic welding.

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