Liquid level switch

Abstract

The utility model relates to the technical field of liquid level switches, in particular to a liquid level switch which comprises a box body, a plurality of pairs of C-shaped buckles are fixedly arranged on the outer wall of the box body at equal intervals through clamping structures, and a plurality of floaters are arranged on the outer wall of the box body in a sliding mode. The hidden danger that the floater moves up and down abnormally is well solved, the flange is directly formed at one end of the box body through a set of molds, different molds do not need to be manufactured according to the length to adapt to liquid level switches of different lengths, mold cost is saved, and the requirements for a forming machine and forming conditions are lowered; and the badness caused by inconsistent length dimension when the box trunk and the bottom cover are welded is avoided.

Description

Technical Field

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

[0002] The liquid level switch uses a float immersed in the liquid to follow the rise or fall of the liquid level, moving up and down on the switch body, thereby affecting the connection or disconnection of the switch element in the body and sending a signal to the system, ultimately achieving the purpose of controlling the water level. Existing liquid level switches, such as the one with application number CN202210067867.3, include a switch body, a float, a plastic box, a boss, a threaded head and a wire. The middle part of the float is provided with a through hole... However, the box part of the current longer liquid level switch (over 120mm) consists of two parts: the box body and the box bottom cover. The box body and the box bottom cover are ultrasonically welded to form a finished box. The following problems exist:

[0003] When the box body is formed, the length dimension is too long. After the molding is completed, the length dimensions of different mold cavities will have deviations. During ultrasonic welding, more than 30% of the welding is poor. The welding is not in place due to the body size being too short, and the welding is deformed due to the body size being too long.

[0004] Because the box body is too long, such as when the size reaches 300mm, 400mm, 500mm, etc., the mold volume increases accordingly, which greatly increases the mold cost. The box is easy to bend, and there is a hidden danger of abnormal up and down movement of the float, which may cause the sensor to malfunction. Since the main trunk of the box is too long, high precision requirements are placed on the molding machine and molding conditions, which increases costs. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art, such as poor welding, poor welding, abnormal up and down movement of the float caused by an overly long box, and the need for multiple length molds that increase costs due to different lengths, and to propose a liquid level switch.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A liquid level switch is designed, comprising a box body. The outer wall of the box body is fixedly provided with a plurality of pairs of C-shaped clips at equal intervals via a snap-fit structure. A plurality of floats are slidably provided on the outer wall of the box body, and each float is disposed between a pair of C-shaped clips. The lower end of the box body is fixedly connected to a bottom cover via a threaded connection structure, and the upper end of the box body is fixedly connected to a flange. The interior of the box body is provided with a spring switch corresponding to the float and a PCB, as well as a cable electrically connecting the spring switch and the PCB.

[0008] Preferably, the threaded connection structure includes a threaded boss and a threaded hole. A threaded hole is provided at the bottom of the box body, and an internal thread is provided on the inner wall of the threaded hole. The top of the bottom cover is integrally formed with a threaded boss, and an external thread is provided on the outer wall of the threaded boss. The upper end of the threaded boss is inserted into the threaded hole and is threadedly connected to the box body through the external thread and the internal thread.

[0009] Preferably, the bottom of the flange is integrally formed with a threaded head, and an outer wall of the threaded head is provided with an external thread for threaded installation.

[0010] Preferably, a plurality of conductors are provided inside the cable, and the lower ends of the plurality of conductors are electrically connected to the PCB and the spring switch.

[0011] Preferably, the clamping structure includes an annular groove, and the outer wall of the box body is provided with a plurality of pairs of annular grooves, and a rotatable C-shaped buckle is clamped in the annular groove.

[0012] Preferably, the C-shaped buckle is made of a circle with a certain elasticity and an inner diameter the same as that of the ring groove, and a fan-shaped notch is opened on the circle to facilitate the entry of the box body.

[0013] Preferably, the upper and lower end surfaces of the C-shaped buckle are both bonded with rubber knobs for cushioning the impact of the float on the C-shaped buckle when it is raised or lowered.

[0014] The liquid level switch proposed by the utility model has the following beneficial effects: the liquid level switch solves the hidden danger of abnormal up and down movement of the float by purchasing a box body without bad bending phenomenon from outside; a flange is directly formed at one end of the box body by a set of molds, and there is no need to make different molds according to length to adapt to liquid level switches of different lengths, thus saving mold costs and reducing the requirements for molding machines and molding conditions; the bottom cover and the box body are directly twisted together, eliminating the defect caused by inconsistent length dimensions when the box trunk and the bottom cover are welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a liquid level switch proposed by the utility model;

[0016] Figure 2 This is an enlarged view of area A of a liquid level switch proposed in the present utility model;

[0017] Figure 3 This is an enlarged view of area B of a liquid level switch proposed in the present utility model;

[0018] Figure 4 This is a schematic diagram of the threaded connection structure of a liquid level switch proposed in the utility model;

[0019] Figure 5The present invention provides a schematic diagram of the clamping structure of a liquid level switch.

[0020] In the figure: 1. Float; 2. Box body; 3. C-shaped buckle; 4. Flange; 5. Cable; 6. Threaded head; 7. Wire; 8. Rubber knob; 9. Ring groove; 10. Bottom cover; 11. Threaded boss; 12. Threaded hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-5 A liquid level switch includes a box body 2, the outer wall of the box body 2 is fixed with several pairs of C-shaped buckles 3 at equal intervals through a snap-fit structure, several floats 1 are slidably provided on the outer wall of the box body 2, and each float 1 is arranged between a pair of C-shaped buckles 3, the lower end of the box body 2 is fixedly connected to the bottom cover 10 through a connecting thread connection structure, the upper end of the box body 2 is fixedly connected to the flange 4, and the interior of the box body 2 is provided with a spring switch and a PCB corresponding to the float 1, as well as a cable 5 electrically connecting the spring switch and the PCB.

[0023] The threaded connection structure includes a threaded boss 11 and a threaded hole 12. The bottom of the box body 2 is provided with a threaded hole 12, and the inner wall of the threaded hole 12 is provided with an internal thread. The top of the bottom cover 10 is integrally formed with a threaded boss 11, and the outer wall of the threaded boss 11 is provided with an external thread. The upper end of the threaded boss 11 is inserted into the threaded hole 12 and is threadedly connected to the box body 2 through the external thread and the internal thread.

[0024] The bottom of the flange 4 is integrally formed with a threaded head 6 , and an outer wall of the threaded head 6 is provided with an external thread for threaded installation.

[0025] A plurality of conductors 7 are provided inside the cable 5 , and the lower ends of the conductors 7 are electrically connected to the PCB and the spring switch.

[0026] The clamping structure includes an annular groove 9 . The outer wall of the box body 2 is provided with a plurality of pairs of annular grooves 9 , and a rotatable C-shaped buckle 8 is clamped in the annular groove 9 .

[0027] The C-shaped buckle 8 is made of a circle with a certain elasticity and an inner diameter that is the same as that of the ring groove 9 , and a fan-shaped notch is opened on the circle to facilitate the entry of the box body 2 .

[0028] The upper and lower end surfaces of the C-shaped buckle 8 are both bonded with rubber knobs 8 for cushioning the impact of the float 1 on the C-shaped buckle 8 when it is raised or lowered.

[0029] Working principle: A straight rod-shaped box body 2 is obtained through external purchase. A flange 4 and a threaded head 6 are formed at one end of the box body 2 through a mold. Several floats 1 are set on the outer wall of the box body 2 and several pairs of C-shaped buckles 3 are snapped into the ring groove 9. The bottom cover 10 is twisted to screw the threaded protrusion 11 into the threaded hole 12. After the bottom cover 10 is installed, the PCB, spring switch and cable 5 are installed into the box body 2; the liquid level switch is installed on the water tank through the threaded head 6; when the water level rises, the float 1 rises with the liquid level. When it reaches a certain water level, the magnet in the float 1 magnetizes the contact of the reed switch, the contact is attracted and turned on, and the output signal is transmitted to the unit, and then the liquid level switch is turned on.

[0030] The liquid level switch solves the hidden danger of abnormal up and down movement of the float by purchasing a box body 2 without bad bending. The flange 4 is directly formed at one end of the box body 2 through a set of molds. There is no need to make different molds according to length to adapt to liquid level switches of different lengths, which saves mold costs and reduces the requirements for molding machines and molding conditions. The bottom cover 10 is directly twisted together with the box body 2, eliminating the defects caused by inconsistent length dimensions when the box trunk and the bottom cover are welded.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid level switch, comprising a box body (2), characterized in that: The outer wall of the box body (2) is fixedly provided with a plurality of pairs of C-shaped buckles (3) at equal intervals via a snap-fit structure. A plurality of floats (1) are slidably provided on the outer wall of the box body (2), and each float (1) is arranged between a pair of C-shaped buckles (3). The lower end of the box body (2) is fixedly connected to a bottom cover (10) via a threaded connection structure. The upper end of the box body (2) is fixedly connected to a flange (4). A spring switch and a PCB corresponding to the float (1) are provided inside the box body (2), as well as a cable (5) electrically connecting the spring switch and the PCB.

2. A liquid level switch according to claim 1, characterized in that: The threaded connection structure comprises a threaded boss (11) and a threaded hole (12); the bottom of the box body (2) is provided with a threaded hole (12), and the inner wall of the threaded hole (12) is provided with an internal thread; the top of the bottom cover (10) is integrally formed with a threaded boss (11), and the outer wall of the threaded boss (11) is provided with an external thread; the upper end of the threaded boss (11) is inserted into the threaded hole (12) and is threadedly connected to the box body (2) via the external thread and the internal thread.

3. The liquid level switch according to claim 1, characterized in that: The bottom of the flange (4) is integrally formed with a threaded head (6), and an outer wall of the threaded head (6) is provided with an external thread for threaded installation.

4. A liquid level switch according to claim 1, characterized in that: A plurality of conductors (7) are provided inside the cable (5), and the lower ends of the plurality of conductors (7) are electrically connected to the PCB and the spring switch.

5. The liquid level switch according to claim 1, characterized in that: The clamping structure comprises an annular groove (9), and the outer wall of the box body (2) is provided with a plurality of pairs of annular grooves (9), and a rotatable C-shaped buckle (3) is clamped in the annular groove (9).

6. The liquid level switch according to claim 1, characterized in that: The C-shaped buckle (3) is made of a circle with a certain elasticity and an inner diameter that is the same as that of the ring groove (9), and a fan-shaped notch is opened on the circle to facilitate the entry of the box body (2).

7. The liquid level switch according to claim 1, characterized in that: The upper and lower end surfaces of the C-shaped buckle (3) are both bonded with rubber convex buttons (8) for buffering the impact of the float (1) on the C-shaped buckle (3) when it is raised or lowered.

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