Capacitive automobile liquid level sensor

Abstract

The utility model discloses a capacitive automobile liquid level sensor, and relates to the technical field of automobile liquid level sensors. A capacitive automobile liquid level sensor comprises a shell internally provided with a circuit board, and further comprises a rod piece fixedly connected with the shell, and the rod piece comprises a smooth section, an external thread section and a detection section; the sealing cover and the sealing ring are arranged on the smooth section in a sleeving mode, and a plane part is arranged on the sealing cover; the sealing ring is arranged in the sealing cover, a plurality of friction blocks are arranged on the sealing ring, and inclined surface walls are arranged on the friction blocks, so that a plurality of point-to-point contact points are formed between the sealing ring and a box body, and the anti-loosening effect of the rod piece is further improved; besides, the designed wedge-shaped fixing block corresponds to the inclined wall, so that the wedge-shaped fixing block on the shell is in contact with and extrudes the inclined wall on the sealing cover, the sealing cover and the sealing ring are further tightly attached to the periphery of the smooth section of the rod piece, and the sealing effect is further enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile liquid level sensors, and in particular relates to a capacitive automobile liquid level sensor. Background Art

[0002] The car's water level sensor is also called a liquid level sensor; the car's water tank water level sensor is mainly used to monitor the water level in the car's water tank. When the water level is too low, the sensor will send a signal to the car's computer to remind the driver to add or change water in time to ensure the normal operation of the engine. This helps prevent the engine from overheating due to lack of water, which in turn causes malfunctions; in addition to water tanks, water level sensors are also commonly used to monitor the levels of other liquids such as antifreeze and brake oil. These sensors are usually installed in corresponding liquid containers, such as antifreeze pots, brake oil pots, etc., to ensure the sufficiency and normality of these critical liquids;

[0003] The existing liquid level sensor is directly screwed onto the liquid box through its own external thread, so that one end of the liquid level sensor extends into the liquid box. Therefore, the sealing between the liquid level sensor and the liquid box is particularly important. The existing sealing method usually adopts a simple sealing ring, but the sealing effect of the sealing ring is general and the anti-loosening effect of the liquid level sensor is poor. Therefore, a capacitive automobile liquid level sensor is proposed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a capacitive automobile liquid level sensor which can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is: a capacitive automobile liquid level sensor, including a shell with a circuit board installed inside, and also including: a rod fixedly connected to the shell, the rod including a smooth section, an external thread section, and a detection section; a sealing cover and a sealing ring sleeved on the smooth section, the sealing cover is provided with a flat portion, and the sealing ring is located in an inner cavity formed by the sealing cover and the flat portion; a plurality of friction blocks circumferentially arranged on the bottom surface of the sealing ring, the friction blocks are provided with an inclined wall, when the external thread section on the rod is screwed on the box body, the sealing cover and the sealing ring are in close contact with the box body, the sealing cover presses the sealing ring, and the friction blocks are in close contact with the box body.

[0006] Preferably, an upper cover is provided on the shell, and a plug is provided on the upper cover.

[0007] Furthermore, a plurality of protruding strips are arranged on the circumference of the outer circumference of the shell.

[0008] Further, an annular groove is formed in the bottom surface of the sealing ring, and a protruding portion is provided on the flat portion of the sealing cover, and the annular groove corresponds to the protruding portion.

[0009] Further, an inclined wall is provided on the outer periphery of the sealing cover, and a wedge-shaped fixing block is provided on the circumferential bottom of the housing, and the wedge-shaped fixing block corresponds to the inclined wall.

[0010] Preferably, the sealing cover and the sealing ring are formed by rubber injection molding.

[0011] Further, a protruding ring is provided on the outer periphery of the smooth section close to the external thread section.

[0012] After adopting the above technical solutions, the present utility model has the following beneficial effects compared with the prior art: By arranging the sealing ring in the sealing cover, arranging a plurality of friction blocks on the sealing ring, and arranging inclined plane walls on the friction blocks, the present utility model realizes multiple point-to-point contact points with the box body, thereby improving the anti-loosening effect of the rod member; In addition, by designing the wedge-shaped fixing block corresponding to the inclined wall, the wedge-shaped fixing block on the housing contacts and presses the inclined wall on the sealing cover, which makes the sealing cover, the sealing ring and the outer periphery of the smooth section of the rod member fit more tightly, thereby further enhancing the sealing effect.

[0013] The following further describes in detail the specific embodiments of the present utility model with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In the drawings:

[0015] Figure 1 is a schematic perspective view of a capacitive automotive liquid level sensor proposed by the present utility model Figure 1 ;

[0016] Figure 2 is a schematic structural view of the A position in a capacitive automotive liquid level sensor proposed by the present utility model Figure 1 ;

[0017] Figure 3 is a front view of a capacitive automotive liquid level sensor proposed by the present utility model

[0018] Figure 4 is a schematic structural view of the B position in a capacitive automotive liquid level sensor proposed by the present utility model Figure 3 ;

[0019] Figure 5 is a schematic structural view of the sealing cover and the inclined wall of a capacitive automotive liquid level sensor proposed by the present utility model

[0020] Figure 6Schematic diagram of the structure of a friction block of a capacitive automotive liquid level sensor proposed by the present utility model;

[0021] Figure 7 Schematic diagram of the structure of a protruding strip of a capacitive automotive liquid level sensor proposed by the present utility model;

[0022] Figure 8 Bottom view of a capacitive automotive liquid level sensor proposed by the present utility model.

[0023] In the figure: 1. Outer shell; 11. Upper cover; 12. Plug; 13. Protruding strip; 2. Rod; 21. Smooth section; 22. External thread section; 23. Detection section; 24. Protruding ring; 3. Sealing cover; 31. Inner cavity; 32. Flat part; 33. Protruding part; 34. Inclined wall; 35. Wedge-shaped fixing block; 4. Sealing ring; 41. Annular groove; 42. Friction block; 43. Inclined plane wall; 5. Box body. Specific implementation mode

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0025] Embodiment 1: Refer to Figures 1 - 8 , a capacitive automotive liquid level sensor, including an outer shell 1 with a circuit board installed inside, and further including: a rod 2 fixedly connected to the outer shell 1, the rod 2 including a smooth section 21, an external thread section 22, and a detection section 23; a sealing cover 3 and a sealing ring 4 sleeved on the smooth section 21, the sealing cover 3 being provided with a flat part 32, and the sealing ring 4 being located in the inner cavity 31 formed by the sealing cover 3 and the flat part 32; a plurality of friction blocks 42 circumferentially arranged on the bottom surface of the sealing ring 4, the friction blocks 42 being provided with inclined plane walls 43. When the external thread section 22 on the rod 2 is screwed tightly onto the box body 5, the sealing cover 3, the sealing ring 4 are in close contact with the box body 5, the sealing cover 3 presses the sealing ring 4, and the friction blocks 42 are in close contact with the box body 5; an upper cover 11 is provided on the outer shell 1, and a plug 12 is provided on the upper cover 11;

[0026] During installation, the rod 2 is inserted into the internal thread provided on the box body 5, and the rod 2 is rotated so that the external thread section 22 on the rod 2 is screwed into the internal thread of the box body 5. During the screwing process, the flat part 32 on the sealing cover 3 and the friction blocks 42 are in close contact with the surface of the box body 5. As the rod 2 continues to be screwed in, the sealing cover 3 and the sealing ring 4 are squeezed tightly between the outer shell 1 and the box body 5;

[0027] During the process of squeezing the sealing cover 3 and the sealing ring 4, the sealing cover 3 squeezes the sealing ring 4 tightly in the inner cavity 31 of the sealing cover 3, making the sealing performance between the smooth section 21 of the rod member 2 better. At the same time, the flat portion 32 of the sealing cover 3 is in close contact with the box body 5, which can prevent liquid from overflowing.

[0028] In addition, during the tightening process, the friction blocks 42 become closer to the box body 5 through the inclined plane walls 43 provided, and the box body 5 is in point-to-point contact with the box body 5 through a plurality of friction blocks 42, thereby improving the anti-loosening effect of the rod member 2 and avoiding the failure or error of the detected liquid level caused by loosening.

[0029] Therefore, by arranging the sealing ring 4 in the sealing cover 3, arranging a plurality of friction blocks 42 on the sealing ring 4, and arranging inclined plane walls 43 on the friction blocks 42, multiple point-to-point contact points are formed between the sealing ring and the box body 5, thereby improving the anti-loosening effect of the rod member 2.

[0030] Embodiment 2: Refer to Figure 5 , a capacitive automotive liquid level sensor, which is basically the same as Embodiment 1. Further, a plurality of protruding strips 13 are circumferentially arranged on the outer periphery of the housing 1;

[0031] By arranging the protruding strips 13 in a protruding shape on the outer periphery of the housing 1, it is convenient to directly twist the housing 1 by hand, thereby realizing the internal thread connection with the box body 5.

[0032] An annular groove 41 is formed on the bottom surface of the sealing ring 4, and a protruding portion 33 is arranged on the flat portion 32 of the sealing cover 3, and the annular groove 41 corresponds to the protruding portion 33;

[0033] During the tightening process, the sealing cover 3 is in close contact with the sealing ring 4. When in close contact, the protruding portion 33 on the sealing cover 3 enters the annular groove 41 of the sealing ring 4, making the sealing ring 4 and the sealing cover 3 tightly engage, and increasing the contact area between the sealing ring 4 and the sealing cover 3, resulting in better sealing effect.

[0034] An inclined wall 34 is arranged on the outer periphery of the sealing cover 3, and a wedge-shaped fixing block 35 is arranged on the circumferential bottom of the housing 1, and the wedge-shaped fixing block 35 corresponds to the inclined wall 34;

[0035] During the tightening process, the housing 1 and the box body 5 squeeze the sealing cover 3 and the sealing ring 4. Therefore, the housing 1 will approach the sealing cover 3, which makes the wedge-shaped fixing block 35 on the housing 1 contact and squeeze the inclined wall 34 on the sealing cover 3, making the sealing cover 3, the sealing ring 4 and the outer periphery of the smooth section 21 of the rod member 2 fit more tightly, thereby further enhancing the sealing effect.

[0036] The sealing cover 3 and the sealing ring 4 are formed by rubber injection molding.

[0037] A protruding ring 24 is provided on the outer periphery of the smooth section 21 close to the external thread section 22. The provision of the protruding ring 24 can prevent the sealing cover 3 and the sealing ring 4 from slipping off the rod member 2.

[0038] In the utility model, the sealing ring 4 is arranged in the sealing cover 3, a plurality of friction blocks 42 are arranged on the sealing ring 4, and inclined plane walls 43 are arranged on the friction blocks 42, so as to achieve multiple point-to-point contact points with the box body 5, thereby improving the anti-loosening effect of the rod member 2. In addition, through the correspondence between the designed wedge-shaped fixing block 35 and the inclined wall 34, the wedge-shaped fixing block 35 on the outer shell 1 contacts and presses against the inclined wall 34 on the sealing cover 3, which makes the sealing cover 3, the sealing ring 4 and the outer periphery of the smooth section 21 of the rod member 2 fit more closely, thereby further enhancing the sealing effect.

[0039] The above description is only a preferred embodiment of the present utility model, and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art of the present utility model can make some changes or modifications to the above-mentioned technical content as an equivalent embodiment of equivalent changes within the scope of the technical solution of the present utility model. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A capacitive automobile liquid level sensor, comprising a housing (1) with a circuit board installed inside, characterized in that: Also includes: A rod (2) fixedly connected to the housing (1), the rod (2) comprising a smooth section (21), an external thread section (22), and a detection section (23); A sealing cover (3) and a sealing ring (4) are sleeved on the smooth section (21), wherein the sealing cover (3) is provided with a plane portion (32), and the sealing ring (4) is located in an inner cavity (31) formed by the sealing cover (3) and the plane portion (32); A plurality of friction blocks (42) are circumferentially arranged on the bottom surface of the sealing ring (4), and a sloped wall (43) is arranged on the friction block (42). When the external threaded section (22) on the rod (2) is screwed onto the housing (5), the sealing cover (3), the sealing ring (4) and the housing (5) are in close contact with each other, the sealing cover (3) presses the sealing ring (4), and the friction block (42) is in close contact with the housing (5).

2. A capacitive automobile liquid level sensor according to claim 1, characterized in that: An upper cover (11) is provided on the housing (1), and a plug (12) is provided on the upper cover (11).

3. A capacitive automobile liquid level sensor according to claim 2, characterized in that: A plurality of protruding strips (13) are arranged on the circumference of the outer circumference of the housing (1).

4. A capacitive automobile liquid level sensor according to claim 3, characterized in that: The bottom surface of the sealing ring (4) is provided with an annular groove (41), the plane portion (32) of the sealing cover (3) is provided with a protrusion (33), and the annular groove (41) corresponds to the protrusion (33).

5. A capacitive automobile liquid level sensor according to claim 4, characterized in that: An inclined wall (34) is provided on the outer circumference of the sealing cover (3), and a wedge-shaped fixing block (35) is provided on the bottom circumference of the housing (1), wherein the wedge-shaped fixing block (35) corresponds to the inclined wall (34).

6. A capacitive automobile liquid level sensor according to claim 1, characterized in that: The sealing cover (3) and the sealing ring (4) are formed by rubber injection molding.

7. A capacitive automobile liquid level sensor according to claim 6, characterized in that: A protruding ring (24) is provided on the outer periphery of the smooth section (21) close to the external thread section (22).

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