A split-type liquid level sensor

Abstract

This utility model relates to a split-type liquid level sensor, belonging to the field of sensor technology. It includes a sensor body and a cable assembly. The sensor body has a three-core plug at its rear end. The cable assembly includes a sleeve, a cable, a cap, and a nut. A three-core socket is sealed inside the sleeve. The cap covers the rear end of the sleeve. One end of the cable is electrically connected to the three-core socket, and the other end extends out of the cap. The front end of the sleeve is detachably fitted to the rear end of the sensor body via the nut, allowing the three-core plug to be inserted into the three-core socket. This structure enables quick assembly and disassembly of the sensor body and the cable assembly. The sealed fit between the three-core socket and the sleeve ensures complete isolation between the sensor body and the cable assembly. When the cable assembly experiences water ingress, water will not enter the sensor body and cause irreversible damage. The nut can be loosened to separate the cable assembly and the sensor body for replacement with a new cable assembly to ensure the normal operation of the sensor body.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and specifically relates to a split-type liquid level sensor. Background Technology

[0002] In many fields such as industrial production and energy extraction, the use of integrated liquid level sensors to monitor liquid levels is a key link in ensuring production safety. These sensors can collect liquid level data in real time, providing a reliable basis for subsequent automated control and safety early warning. They are widely used in high-temperature and normal-temperature environments. However, during long-term use in the above-mentioned high-temperature environments, integrated liquid level sensors generally face the severe challenge of sealing failure, which has become a bottleneck restricting their service life and application reliability.

[0003] Conventional integrated liquid level sensors use a sealed structure to encapsulate the connection between the cable and the sensor body to prevent external liquids from entering the sensor body. However, under continuous high-temperature conditions, the elastic sealing material used in the sealing structure will gradually undergo thermal aging, causing plastic deformation at the cable seal, which in turn leads to seal failure. External liquids can then directly enter the sensor and damage the circuit board, sensing elements, and other core components inside, resulting in complete damage to the entire sensor product.

[0004] Therefore, there is an urgent need for a modular liquid level sensor that is easy to assemble, has interchangeable components, and has a longer service life. Utility Model Content

[0005] This invention provides a split-type liquid level sensor to solve the technical problem of complete damage caused by water ingress due to sealing failure in existing integrated liquid level sensors.

[0006] This utility model is achieved through the following technical solution: a split-type liquid level sensor, including a sensor body and a cable assembly. The rear end of the sensor body is provided with a three-core plug. The cable assembly includes a sleeve, a cable, a cap, and a nut. A three-core socket is sealed and inserted into the sleeve. The cap covers the rear end of the sleeve. One end of the cable is electrically connected to the three-core socket and the other end extends out of the cap. The front end of the sleeve is detachably sleeved on the rear end of the sensor body through the nut, so that the three-core plug is inserted into the three-core socket.

[0007] To better realize this utility model, further optimizations are made to the above structure. The sensor body includes a sensor housing, a sensor probe, and a signal line. The sensor probe is sealed and connected to the front end of the sensor housing. A connector is provided at the rear end of the sensor housing. The connector is inserted into the sleeve. A first sealing ring is provided between the connector and the sleeve. The connector has a central hole. The three-core plug is sealed and inserted into the central hole. The sensor probe is electrically connected to the three-core plug through the signal line.

[0008] To better realize this utility model, further optimizations are made to the above structure. The rear end of the sensor housing is provided with an external thread, the outer wall of the front end of the sleeve is provided with a retaining ring, the inner wall of the front end of the nut is provided with an internal thread and the inner wall of the rear end is a light hole, and a step is formed at the position where the internal thread and the light hole meet. When the nut is screwed and fixed to the external thread on the sensor housing, the retaining ring abuts against the step.

[0009] To better realize this utility model, the above structure is further optimized by including a positioning pin. The connector has a positioning hole on one side, and the retaining ring has a notch aligned with the positioning hole on one side. One end of the positioning pin is fixed in the positioning hole and the other end is inserted into the notch.

[0010] To better realize this utility model, the above structure is further optimized by providing a second sealing ring between the three-core socket and the three-core plug.

[0011] To better realize this utility model, the above structure is further optimized by providing a third sealing ring between the cable and the sleeve.

[0012] To better realize this utility model, the above structure is further optimized by including polyurethane adhesive, which is filled between the cable and the sleeve, and a filling hole for filling the polyurethane adhesive is provided on one side of the sleeve.

[0013] To better realize this utility model, the above structure is further optimized by including a sealing ball, which is inserted into the filling hole.

[0014] Compared with the prior art, this utility model has the following advantages: This utility model provides a split-type liquid level sensor comprising a sensor body and a cable assembly. The sensor body has a three-core plug at its rear end. The cable assembly includes a sleeve, a cable, a cap, and a nut. A three-core socket is sealed inside the sleeve, and the cap covers the rear end of the sleeve. One end of the cable is electrically connected to the three-core socket, and the other end extends out of the cap. The front end of the sleeve is detachably fitted onto the rear end of the sensor body via the nut, allowing the three-core plug to be inserted into the three-core socket. This structure enables quick assembly and disassembly of the sensor body and cable assembly via the three-core plug and socket. The sealed fit between the three-core socket and the sleeve ensures complete isolation between the sensor body and the cable assembly. When the cable assembly experiences water ingress, water will not enter the sensor body and cause irreversible damage. In this case, the cable assembly and sensor body can be separated simply by loosening the nut, allowing for replacement with a new cable assembly to ensure normal operation of the sensor body. The design is convenient to assemble and disassemble, highly interchangeable, and extends the service life of the sensor body, making this utility model more practical. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the split-type liquid level sensor in this utility model; Figure 2 This is a schematic diagram of the sensor body in this utility model; Figure 3 This is a structural schematic diagram of the cable assembly in this utility model.

[0017] In the picture: 1-Sensor body; 2-Cable assembly; 3-Three-core plug; 4-Sleeve; 5-Cable; 6-Cap; 7-Nut; 8-Three-core socket; 9-Sensor housing; 10-Sensor probe; 11-Signal line; 12-Connector; 13-First sealing ring; 14-Retaining ring; 15-Step; 16-Positioning pin; 17-Notch; 18-Second sealing ring; 19-Third sealing ring; 20-Polyurethane adhesive; 21-Sealing ball. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Example 1: In this embodiment, a split-type liquid level sensor, such as... Figures 1 to 3 As shown, the sensor includes a sensor body 1 and a cable assembly 2. Specifically, the sensor body 1 has a three-core plug 3 at its rear end. The cable assembly 2 includes a sleeve 4, a cable 5, a cap 6, and a nut 7. A three-core socket 8 is sealed and inserted into the sleeve 4. The cap 6 covers the rear end of the sleeve 4 to close it. One end of the cable 5 is electrically connected to the three-core socket 8, and the other end extends out of the cap 6. The front end of the sleeve 4 is detachably sleeved onto the rear end of the sensor body 1 through the nut 7, so that the three-core plug 3 is inserted into the three-core socket 8.

[0022] This structure enables quick assembly and disassembly of the sensor body 1 and the cable assembly 2 via the three-core plug 3 and the three-core socket 8. The sealing fit between the three-core socket 8 and the sleeve 4 ensures complete isolation between the inside of the sensor body 1 and the cable assembly 2. When the cable assembly 2 experiences water ingress, water will not enter the sensor body 1 and cause irreversible damage. In this case, the cable assembly 2 and the sensor body 1 can be separated by loosening the nut 7 to replace the cable assembly 2 and ensure the normal use of the sensor body 1. The structure is easy to assemble and disassemble, highly interchangeable, and extends the service life of the sensor body 1, making this invention more practical.

[0023] In this embodiment, the main body of the three-core socket 8 is made of soft rubber and is press-fitted with the inner wall of the sleeve 4 to achieve a sealing effect, preventing water that has entered the sleeve 4 through the cap 6 from flowing further through the sleeve 4 to the sensor body 1.

[0024] As one specific implementation method of this embodiment, such as Figure 2 As shown, the sensor body 1 includes a sensor housing 9, a sensor probe 10, and a signal line 11. The sensor probe 10 is sealed to the front end of the sensor housing 9 by means of a sealing ring or potting compound. The rear end of the sensor housing 9 is integrally provided with a connector 12, which is inserted into the sleeve 4. A first sealing ring 13 is provided between the connector 12 and the sleeve 4 to prevent water from entering the gap between the connector 12 and the sleeve 4. The connector 12 has a central hole, and the three-core plug 3 is sealed and inserted into the central hole by means of an interference fit. The sensor probe 10 is electrically connected to the three-core plug 3 through the signal line 11. This arrangement forms a completely sealed chamber inside the sensor body 1. The inside of the sensor housing 9 is completely sealed by the sensor probe 10, the three-core plug 3, and the first sealing ring 13 at both ends, thereby achieving a completely waterproof effect.

[0025] In this embodiment, as Figure 1 and Figure 3As shown, the sensor housing 9 has an external thread at its rear end, the sleeve 4 has a retaining ring 14 extending from its front outer wall, the nut 7 has an internal thread on its front inner wall and a light hole on its rear inner wall, and a step 15 is formed at the position where the internal thread meets the light hole. When the nut 7 is tightened and fixed to the external thread on the sensor housing 9, the retaining ring 14 abuts against the step 15. With this configuration, after the nut 7 is tightened, the step 15 tightly abuts against the retaining ring 14, thereby making the connector 12 and the sleeve 4 fit together more tightly, thus making the connection between the sensor housing 9 and the sleeve 4 more secure. The first sealing ring 13 is compressed and deformed by the connector 12 and the sleeve 4, so that the gap between the connector 12 and the sleeve 4 is completely sealed by the first sealing ring 13.

[0026] As an optimization, such as Figure 1 and Figure 3 As shown, it also includes a positioning pin 16. The connector 12 has a positioning hole on one side, and the retaining ring 14 has a notch 17 on one side that is aligned with the positioning hole. One end of the positioning pin 16 is fixed in the positioning hole and the other end is inserted into the notch 17. By embedding the positioning pin 16 between the connector 12 and the retaining ring 14, the sensor housing 9 and the sleeve 4 are locked in the circumferential direction by the positioning pin 16 after they are connected. When the nut 7 is turned, the sensor housing 9 and the sleeve 4 will not rotate relative to each other in the circumferential direction.

[0027] Furthermore, such as Figure 1 and Figure 3 As shown, a second sealing ring 18 is provided between the three-core socket 8 and the three-core plug 3. That is, the second sealing ring 18 is provided at the contact surface after the three-core socket 8 and the three-core plug 3 are connected. It is used to seal the gap between the contact surface of the three-core socket 8 and the three-core plug 3, thereby forming a double-safety seal with the first sealing ring 13 to prevent water from entering the electrical connection point of the three-core socket 8 and the three-core plug 3 and causing damage.

[0028] In this embodiment, as Figure 1 As shown, a third sealing ring 19 is provided between the cable 5 and the sleeve 4. That is, the third sealing ring 19 is provided between the inner wall of the sleeve 4 and the cable 5. The third sealing ring 19 divides the internal space of the sleeve 4 into two areas, front and rear. The rear area is connected to the cap 6. Even if water enters the cap 6, the water will be blocked by the third sealing ring 19 and will not enter the front area, thereby improving waterproofness. The number of the third sealing rings 19 can be set to multiple, and the multiple third sealing rings 19 are arranged at intervals to form multiple layers of waterproof protection.

[0029] Furthermore, such as Figure 1As shown, it also includes polyurethane adhesive 20, which is filled between the cable 5 and the sleeve 4. The sleeve 4 has a filling hole on one side for filling the polyurethane adhesive 20. The polyurethane adhesive 20 further fills and seals the internal space of the sleeve 4, and works together with the third sealing ring 19 to form full-area waterproofing, effectively preventing water from entering the three-core socket 8. Even if water enters the three-core socket 8 and causes a power problem, the abnormality can be detected by the system immediately, making it easy for personnel to remove the damaged cable assembly 2 and replace it with a new one, ensuring that the sensor body 1 is not affected and can continue to be used.

[0030] Furthermore, it also includes a sealing ball 21, which is inserted into the filling hole. After the glue is poured, the sealing ball 21 is inserted to seal the filling hole.

[0031] The aforementioned split-type liquid level sensor, through the modular separation of the sensor body 1 and the cable assembly 2, combined with the precise insertion and connection of the three-core plug 3 and the three-core socket 8, achieves rapid disassembly and interchangeability, significantly reducing maintenance difficulty and cost. Simultaneously, it utilizes multiple sealing protections: a first sealing ring 13 between the connector 12 and the sleeve 4; a second sealing ring 18 at the mating surface of the three-core plug 3 and the three-core socket 8; multiple third sealing rings 19 between the cable 5 and the sleeve 4; and polyurethane adhesive 20 for filling and sealing, supplemented by the sealing ball 21 for sealing the filling holes. The sealing creates a complete waterproof barrier from the inside of the sensor body 1 to the end of the cable assembly 2, effectively isolating external moisture from intrusion and ensuring the stability and reliability of the electrical connection. In addition, the circumferential limiting design of the positioning pin 16 and the axial clamping structure of the nut 7 further enhance the firmness of the connection between the sensor body 1 and the cable assembly 2, preventing relative rotation or loosening during assembly and use. The overall structure takes into account ease of disassembly and assembly, waterproof sealing, and structural stability, extending the service life of the sensor body 1 and enhancing the product's adaptability to harsh working conditions such as deep water and high temperature.

[0032] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A split-type liquid level sensor, characterized in that: The sensor body (1) and cable assembly (2) are included. The sensor body (1) has a three-core plug (3) at its rear end. The cable assembly (2) includes a sleeve (4), a cable (5), a cap (6) and a nut (7). A three-core socket (8) is sealed and inserted into the sleeve (4). The cap (6) covers the rear end of the sleeve (4). One end of the cable (5) is electrically connected to the three-core socket (8) and the other end extends out of the cap (6). The front end of the sleeve (4) is detachably sleeved onto the rear end of the sensor body (1) through the nut (7) so that the three-core plug (3) is inserted into the three-core socket (8).

2. The split-type liquid level sensor according to claim 1, characterized in that: The sensor body (1) includes a sensor housing (9), a sensor probe (10), and a signal line (11). The sensor probe (10) is sealed and connected to the front end of the sensor housing (9). The rear end of the sensor housing (9) is provided with a connector (12). The connector (12) is inserted into the sleeve (4). A first sealing ring (13) is provided between the connector (12) and the sleeve (4). The connector (12) is provided with a central hole. The three-core plug (3) is sealed and inserted into the central hole. The sensor probe (10) is electrically connected to the three-core plug (3) through the signal line (11).

3. A split-type liquid level sensor according to claim 2, characterized in that: The sensor housing (9) has an external thread at the rear end, and the sleeve (4) has a retaining ring (14) extending from the outer wall of the front end. The nut (7) has an internal thread on the inner wall of the front end and a light hole on the inner wall of the rear end. A step (15) is formed at the position where the internal thread and the light hole meet. When the nut (7) is screwed and fixed to the external thread on the sensor housing (9), the retaining ring (14) abuts against the step (15).

4. A split-type liquid level sensor according to claim 3, characterized in that: It also includes a positioning pin (16), a positioning hole is provided on one side of the connector (12), and a notch (17) is provided on one side of the retaining ring (14) that is aligned with the position of the positioning hole. One end of the positioning pin (16) is fixed in the positioning hole and the other end is inserted into the notch (17).

5. A split-type liquid level sensor according to claim 1, characterized in that: A second sealing ring (18) is provided between the three-core socket (8) and the three-core plug (3).

6. A split-type liquid level sensor according to claim 1, characterized in that: A third sealing ring (19) is provided between the cable (5) and the sleeve (4).

7. A split-type liquid level sensor according to claim 1, characterized in that: It also includes polyurethane adhesive (20), which fills the space between the cable (5) and the sleeve (4), and the sleeve (4) has a filling hole on one side for filling the polyurethane adhesive (20).

8. A split-type liquid level sensor according to claim 7, characterized in that: It also includes a sealing ball (21), which is fitted into the filling hole.

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