Closed single-magnet liquid level sensor in automobile

Abstract

The utility model discloses an automobile inner closed type single-magnet liquid level sensor in the field of sensor oil level detection, which comprises a floater rod, the floater rod is rotatably connected with a shell, the floater rod is fixed with an outer rotating support, an outer magnet is arranged on the outer rotating support, a cover plate is arranged on the shell, an inner swing rod is rotatably connected in the shell, and the inner swing rod is fixed on the inner swing rod. A resistor disc is arranged in the shell, a mounting groove is formed in the rear side of one end of the inner swing rod, the depth of the mounting groove is smaller than the thickness of the inner swing rod, a ferromagnetic metal block is arranged in the mounting groove and corresponds to the outer magnet, and an L-shaped clamping jaw for fixing the metal block is arranged on the inner wall of the mounting groove of the inner swing rod. Limiting parts of the clamping jaws are attached to the back faces of the metal blocks. According to the utility model, the low-price metal iron block is adopted to attract the outer magnet, and the outer magnet drives the metal iron block to rotate, so that the subsequent manufacturing cost is saved.

Description

Technical Field

[0001] The utility model belongs to the field of sensor oil (liquid) level detection, in particular to a closed single-magnet liquid level sensor in an automobile. Background Art

[0002] In the prior art, there is a sealed liquid level and oil level sensor, the patent application number of which is CN201110157241.3; the application date is 20110613; the structure of which includes a float and a float rod fixedly connected together, a thick film resistor fixed on a frame, a brush fixed on an inner rotating bracket, an inner magnet fixed on an inner rotating bracket, and an inner rotating bracket hinged on the frame; an outer rotating bracket hinged on the frame, an outer magnet fixed on the outer rotating bracket, and a float rod fixedly connected to the outer rotating bracket; a cover plate is sealed and welded and fixed on the frame, a thick film resistor and an inner rotating bracket are placed in the receiving space of the frame, a brush is pressed on the upper guide belt and the lower guide belt of the resistor sheet, and the outer magnet faces the inner magnet. The sensor uses the attraction between two inner and outer magnets to drive the work, the outer rotating bracket drives the inner rotating bracket to rotate, and the reed sheet rubs the resistor sheet to realize the change of resistance value and thus display the oil level information, but its disadvantages are that the price of the magnet is higher than that of iron, and when the inner magnet is installed on the inner rotating bracket, the installation is not convenient enough. Utility Model Content

[0003] The purpose of the utility model is to provide a closed single-magnet liquid level sensor in an automobile, which can use a relatively low-priced metal iron block to attract an external magnet, and the metal iron block is driven to rotate by the external magnet, thereby saving subsequent production costs, facilitating processing, and making it more convenient to disassemble and install the metal iron block.

[0004] The purpose of the utility model is achieved as follows: a closed single-magnet liquid level sensor in a car, including a float rod, which is rotatably connected to a shell, fixed to an outer rotating bracket, an outer magnet is arranged on the outer rotating bracket, a cover plate is arranged on the shell, an inner swing rod is rotatably connected inside the shell, a resistor is arranged inside the shell, a mounting groove is opened on the rear side of one end of the inner swing rod, the depth of the mounting groove is less than the thickness of the inner swing rod, a ferromagnetic metal block is arranged inside the mounting groove, the metal block is arranged corresponding to the outer magnet, an L-shaped claw for fixing the metal block is arranged on the inner wall of the mounting groove of the inner swing rod, and the limiting portion of the claw fits the back of the metal block.

[0005] The sensor of the utility model is installed in the automobile fuel tank to detect the liquid level. The position of the float rod is different at different liquid level positions. The external magnet drives the metal block to move at the same time. After the position of the inner swing rod changes, the reed contacts the different positions of the resistor sheet, and the resistance changes to show the change of the liquid level. Compared with the prior art, the beneficial effect of the utility model is that it can use a relatively low-priced metal iron block to attract the external magnet, and the metal iron block is driven to rotate by the external magnet, thereby saving subsequent production costs and facilitating processing; and the metal iron block is more convenient to disassemble and install, and the metal block can be firmly fixed on the inner swing rod.

[0006] As a further improvement of the present invention, the metal block is an iron block.

[0007] As a further improvement of the utility model, the metal block is provided with two symmetrical positioning surfaces on one side close to the external magnet, and an attraction surface is formed between the two positioning surfaces on the metal block, the attraction surface is exposed and arranged corresponding to the external magnet, and the metal block is matched with the mounting groove. The external magnet attracts the attraction surface of the metal block, thereby driving the inner swing rod to rotate.

[0008] As a further improvement of the utility model, the other end of the inner swing rod is provided with a mounting sleeve, the end of the float rod is vertically provided with a mounting rod, a mounting cylinder is provided in the housing, the mounting rod passes through the cover plate and is inserted into the central hole of the mounting cylinder and is rotatably connected to the mounting cylinder, a bushing is provided on the outer periphery of the mounting cylinder, and the mounting sleeve is rotatably connected to the outer periphery of the bushing. The rotation axis of the inner swing rod coincides with that of the float rod.

[0009] As a further improvement of the utility model, a reed is provided on the inner swing rod corresponding to the resistor, and two metal cylinders extending into the shell are provided on the shell, and the two metal cylinders are respectively connected to two metal guide strips, and the other ends of the two metal guide strips are connected to the resistor. When the reed contacts different positions of the resistor, the resistance value changes, reflecting the change in the height position of the oil level. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 for Figure 1 A partial enlarged view of .

[0012] Figure 3 This is a schematic diagram of the outer magnet structure of the utility model.

[0013] Figure 4 It is a schematic diagram of the internal structure of the utility model.

[0014] Figure 5 This is a connection diagram between the mounting sleeve and the mounting tube of the inner swing arm.

[0015] Figure 6This is a schematic diagram of the structure on the back of the resistor.

[0016] Figure 7 This is a schematic diagram of the structure of the front side of the resistor.

[0017] Among them, 1 float rod, 1a mounting rod, 2 shell, 3 external rotating bracket, 4 external magnet, 5 cover plate, 6 inner rocker rod, 6a mounting sleeve, 7 resistor, 8 mounting groove, 9 metal block, 9a positioning surface, 9b attraction surface, 10 claw, 10a limiting part, 11 mounting cylinder, 11a center hole, 12 bushing, 13 spring leaf, 14 metal guide belt, 15 metal cylinder, 16 float, 17 limiting block. DETAILED DESCRIPTION

[0018] like Figure 1-7 As shown, a closed single-magnet liquid level sensor for automobiles comprises a float rod 1, which is rotatably connected to a shell body 2, and is fixed to an outer rotating bracket 3. An outer magnet 4 is arranged on the outer rotating bracket 3, and a cover plate 5 is arranged on the shell body 2. An inner swing rod 6 is rotatably connected inside the shell body 2, and a resistor sheet 7 is arranged inside the shell body 2. A mounting groove 8 is provided at the rear side of one end of the inner swing rod 6, and the depth of the mounting groove 8 is less than the thickness of the inner swing rod 6. A ferromagnetic metal block 9 is arranged inside the mounting groove 8, and the metal block 9 is an iron block; the metal block 9 is arranged corresponding to the outer magnet 4, and an L-shaped claw 10 for fixing the metal block 9 is arranged on the inner wall of the mounting groove 8 of the inner swing rod 6, and the limiting portion 10a of the claw 10 is attached to the back of the metal block 9. The metal block 9 is provided with two symmetrical positioning surfaces 9a on one side close to the external magnet 4. An attraction surface 9b is formed between the two positioning surfaces 9a on the metal block 9. The attraction surface 9b is exposed to the outside and is arranged corresponding to the external magnet 4. The metal block 9 is arranged to match the mounting groove 8. The external magnet 4 attracts the attraction surface 9b of the metal block 9, thereby driving the inner swing rod 6 to rotate.

[0019] The other end of the inner swing rod 6 is provided with a mounting sleeve 6a, the end of the float rod 1 is vertically provided with a mounting rod 1a, a mounting cylinder 11 is provided in the housing 2, the mounting rod 1a passes through the cover plate 5 and is inserted into the central hole 11a of the mounting cylinder 11 and is rotatably connected to the mounting cylinder 11, a bushing 12 is provided on the outer periphery of the mounting cylinder 11, and the mounting sleeve 6a is rotatably connected to the outer periphery of the bushing 12. The inner swing rod 6 coincides with the rotation axis of the float rod 1.

[0020] A reed 13 is provided on the inner swing rod 6 corresponding to the resistor 7, and two metal cylinders 15 extending into the housing 2 are provided on the housing 2. The two metal cylinders 15 are respectively connected to two metal guide strips 14, and the other ends of the two metal guide strips 14 are connected to the resistor 7. When the reed 13 contacts different positions of the resistor 7, the resistance value changes, reflecting the change in the height position of the oil level.

[0021] The sensor of the utility model is installed in the automobile fuel tank to detect the liquid level. The other end of the float rod 1 is provided with a float 16 floating on the liquid surface. The position of the float rod 1 is different at different liquid level positions. The external magnet 4 drives the metal block 9 to move at the same time. After the position of the inner swing rod 6 changes, the reed 13 contacts the different positions of the resistor 7, and the resistance changes to show the change of the liquid level. The inner wall of the housing 2 is provided with a plurality of limit blocks 17 for fixing the resistor 7. The advantages of the utility model are: a relatively low-priced metal iron block can be used to attract the external magnet 4, and the metal iron block is driven to rotate by the external magnet 4, thereby saving subsequent production costs and facilitating processing; and the metal iron block is more convenient to disassemble and install, and the metal block 9 can be firmly fixed on the inner swing rod 6.

[0022] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A closed single magnet liquid level sensor for automobiles, comprising a float rod, the float rod is rotatably connected to a housing, the float rod is fixed to an outer rotating bracket, an outer magnet is arranged on the outer rotating bracket, a cover plate is arranged on the housing, an inner swing rod is rotatably connected inside the housing, and a resistor is arranged inside the housing, characterized in that: A mounting groove is provided on the rear side of one end of the inner swing arm, the depth of which is less than the thickness of the inner swing arm, a ferromagnetic metal block is arranged inside the mounting groove, the metal block is arranged corresponding to the external magnet, and an L-shaped claw is provided on the inner wall of the mounting groove of the inner swing arm to fix the metal block, and the limiting part of the claw is in contact with the back of the metal block.

2. The closed single magnet liquid level sensor for automobile according to claim 1, characterized in that: The metal block is an iron block.

3. A closed single magnet liquid level sensor in a car according to claim 1 or 2, characterized in that: The metal block is provided with two left-right symmetrical positioning surfaces on one side close to the external magnet, and an attraction surface is formed between the two positioning surfaces on the metal block. The attraction surface is exposed and arranged corresponding to the external magnet, and the metal block is arranged to match the installation slot.

4. A closed single magnet liquid level sensor for automobiles according to claim 1 or 2, characterized in that: A mounting sleeve is provided at the other end of the inner swing rod, a mounting rod is vertically provided at the end of the float rod, a mounting cylinder is provided in the shell, the mounting rod passes through the cover plate and is inserted into the center hole of the mounting cylinder and is rotatably connected to the mounting cylinder, a bushing is provided on the outer periphery of the mounting cylinder, and the mounting sleeve is rotatably connected to the outer periphery of the bushing.

5. The closed single magnet liquid level sensor for automobile according to claim 4, characterized in that: A spring sheet is arranged on the inner swing rod corresponding to the resistor sheet, and two metal cylinders extending into the shell are arranged on the shell. The two metal cylinders are respectively connected to two metal conductive strips, and the other ends of the two metal conductive strips are connected to the resistor sheet.

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