Liquid level sensor resistant to misoperation

Abstract

The utility model relates to the technical field of liquid level sensors, in particular to a misoperation-resistant liquid level sensor which comprises a sensor body, a PCB is arranged in a cylindrical inner cavity of the sensor body, a clamping block is arranged at the top of the PCB, a clamping groove is formed in the top of the sensor body, the clamping block is clamped into the clamping groove, and the clamping block is clamped into the clamping groove. A mounting base is arranged on the PCB, a first magnetic reed switch and a second magnetic reed switch are arranged on the mounting base, a plug is welded to the bottom of a cylinder of the sensor body, a first buckle is arranged on the outer wall of the cylinder of the sensor body, and the first buckle is located at the top of the cylinder of the sensor body; according to the misoperation-resistant liquid level sensor, the bottom of the sensor body is not in contact, so that injection molding deformation cannot affect positioning, the PCB cannot be affected after ultrasonic treatment of the plug, the PCB and the clamping block are in a step shape, and product misoperation caused by poor ultrasonic precision of the sensor body can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to a malfunction-resistant liquid level sensor. Background Art

[0002] Liquid level sensors are simple, easy-to-use level control devices. A float rises and falls with the liquid, causing a magnet to move up and down accordingly. A magnetic field activates a reed switch inside the sensor, closing or opening the switch to control the circuit. They require no power supply, lack complex circuitry, and offer advantages such as compact size and long service life. They are widely used in shipbuilding, generator equipment, petrochemicals, the food industry, water treatment equipment, dyeing and finishing, and hydraulic machinery. Currently, existing technology relies on contact between the bottom of the PCB and the bottom of the housing to ensure the magnet remains within the desired triggering range. However, existing technology suffers from the following application drawbacks: The PCB positioning method employed is prone to malfunction; the plastic housing employed is prone to dimensional uncontrollable after ultrasonic testing; and the plug employed is prone to uncontrollable positioning after ultrasonic testing. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a liquid level sensor that is resistant to misoperation.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A malfunction-resistant liquid level sensor is designed, comprising a sensor body. A PCB is disposed in the cylindrical inner cavity of the sensor body. A clamping block is disposed on the top of the PCB. A clamping slot is formed on the top of the sensor body, and the clamping block is inserted into the clamping slot. A mounting seat is disposed on the PCB, and a first reed switch and a second reed switch are respectively disposed on the mounting seat. A plug is welded to the cylindrical bottom of the sensor body.

[0006] Preferably, a first buckle is provided on the cylindrical outer wall of the sensor body, and the first buckle is located at the cylindrical top of the sensor body.

[0007] Preferably, the cylindrical outer wall of the sensor body is sleeved with a first float and a second float, and the inner cavities of the first float and the second float are provided with slip rings, which are sleeved on the cylindrical outer wall of the sensor body.

[0008] Preferably, a second buckle and a third buckle are sleeved on the cylindrical outer wall of the sensor body, and the second buckle and the third buckle are located between the first float and the second float.

[0009] Preferably, a fourth buckle is sleeved on the cylindrical outer wall of the sensor body, and the fourth buckle is located between the second float and the plug.

[0010] The utility model proposes a malfunction-resistant liquid level sensor, which has the following beneficial effects: a slot is provided on the top of the sensor body, a card block is provided on the top of the PCB board, and the card block is inserted into the slot so that the bottom of the sensor body does not contact the sensor body. Therefore, injection molding deformation will not affect the positioning, and similarly, ultrasonic plugging will not affect the PCB board. The PCB board and the card block are in a stepped shape, which can prevent the product from malfunctioning due to poor ultrasonic accuracy of the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of a malfunction-resistant liquid level sensor proposed by the present invention;

[0012] Figure 2 This is an AA cross-sectional view of a malfunction-resistant liquid level sensor proposed in the present invention;

[0013] Figure 3 This is an isometric view of a malfunction-resistant liquid level sensor proposed in the present invention;

[0014] Figure 4 This is an exploded view of a malfunction-resistant liquid level sensor proposed in the present invention;

[0015] Figure 5 This is a top view of a malfunction-resistant liquid level sensor proposed by the present invention.

[0016] In the figure: 1 sensor body, 2 PCB board, 3 first clip, 4 first float, 5 first reed switch, 6 second clip, 7 third clip, 8 second float, 9 second reed switch, 10 fourth clip, 11 plug, 12 mounting base, 13 card block, 14 card slot, 15 terminal, 16 slip ring. DETAILED DESCRIPTION

[0017] 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.

[0018] Reference Figure 1-5 A liquid level sensor resistant to misoperation includes a sensor body 1, a PCB board 2 is arranged in the cylindrical inner cavity of the sensor body 1, a card block 13 is arranged on the top of the PCB board 2, a card slot 14 is opened on the top of the sensor body 1, the card block 13 is inserted into the card slot 14, a mounting base 12 is provided on the PCB board 2, and a first reed switch 5 and a second reed switch 9 are respectively provided on the mounting base 12, and a plug 11 is welded to the bottom of the cylinder of the sensor body 1.

[0019] The cylindrical outer wall of the sensor body 1 is provided with a first clip 3, and the first clip 3 is located at the top of the cylinder of the sensor body 1. The cylindrical outer wall of the sensor body 1 is sleeved with a first float 4 and a second float 8. The inner cavity of the first float 4 and the second float 8 is provided with a slip ring 16, and the slip ring 16 is sleeved on the cylindrical outer wall of the sensor body 1.

[0020] The cylindrical outer wall of the sensor body 1 is sleeved with a second clip 6 and a third clip 7, which are located between the first float 4 and the second float 8. The cylindrical outer wall of the sensor body 1 is sleeved with a fourth clip 10, which is located between the second float 8 and the plug 11. The first clip 3 is provided to fix the first float 4 to prevent it from exceeding the upper limit; the second clip 6 prevents the first float 4 from exceeding the lower limit, and the third clip 7 fixes the second float 8, also preventing it from exceeding the upper limit.

[0021] 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 sensor resistant to malfunction, comprising a sensor body (1), characterized in that: A PCB board (2) is arranged in the cylindrical inner cavity of the sensor body (1), a card block (13) is arranged on the top of the PCB board (2), a card slot (14) is opened on the top of the sensor body (1), and the card block (13) is inserted into the card slot (14), a mounting seat (12) is arranged on the PCB board (2), and a first reed switch (5) and a second reed switch (9) are respectively arranged on the mounting seat (12), and a plug (11) is welded to the bottom of the cylinder of the sensor body (1).

2. The malfunction-resistant liquid level sensor according to claim 1, characterized in that: The cylindrical outer wall of the sensor body (1) is provided with a first buckle (3), and the first buckle (3) is located at the top of the cylinder of the sensor body (1).

3. The malfunction-resistant liquid level sensor according to claim 1, characterized in that: The cylindrical outer wall of the sensor body (1) is sleeved with a first float (4) and a second float (8); the inner cavities of the first float (4) and the second float (8) are provided with a slip ring (16); and the slip ring (16) is sleeved on the cylindrical outer wall of the sensor body (1).

4. The malfunction-resistant liquid level sensor according to claim 1, characterized in that: A second clip (6) and a third clip (7) are sleeved on the cylindrical outer wall of the sensor body (1); the second clip (6) and the third clip (7) are located between the first float (4) and the second float (8).

5. The malfunction-resistant liquid level sensor according to claim 1, characterized in that: A fourth buckle (10) is sleeved on the cylindrical outer wall of the sensor body (1), and the fourth buckle (10) is located between the second float (8) and the plug (11).

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