Closed liquid level sensor

Abstract

The utility model discloses a closed type liquid level sensor in the field of sensor oil level detection, which comprises a framework, a lever support connected onto the framework, a floater rod mounted on the lever support, a reed support extending into the framework and connected with the lever support, a reed body mounted on the reed support and arranged corresponding to a resistor disc inside the framework, and the floater rod mounted on the reed support is connected with a floater rod mounted on the floater rod. A rotating shaft is arranged on the lever support, an inner sleeve is arranged on the periphery of the rotating shaft, an outer sleeve corresponding to the inner sleeve is arranged on the inner wall of the mounting cylinder, the rotating shaft extends into the mounting cylinder in a matched mode, and the inner sleeve is inserted into the outer sleeve in a matched mode and is rotationally connected with the outer sleeve; and insulating grease is arranged at the upper and lower ends of the inner sleeve and the outer sleeve in the mounting cylinder. Oil leakage caused by abrasion of the sensor can be avoided, and the service life is prolonged.

Description

Technical Field

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

[0002] The structure of the traditional closed oil level sensor includes a frame, a lever support is rotatably connected to the frame, a float rod is installed on the lever support, the lever support extends into the frame and is connected to a reed support, a reed is installed on the reed support, and the reed is arranged corresponding to the resistor inside the frame; when working, the float rod changes position according to the change of the oil level in the oil tank, the lever support drives the reed support to rotate, the contact position of the reed and the resistor changes, and the change of resistance value reflects the change of oil level. In the prior art, the lever support and the frame rotation connection of the closed oil level sensor are generally connected by a sealing ring, but the problem is that the friction between the lever support and the frame is large, and long-term rotation is easy to wear and cause oil leakage. Utility Model Content

[0003] The purpose of the utility model is to provide a closed liquid level sensor, in which the sealing ring at the rotating connection between the lever bracket and the frame is replaced with inner and outer metal sleeves, and the inner and outer metal sleeves are oiled to reduce friction, thereby avoiding oil leakage caused by long-term wear of the connection between the lever bracket and the frame and extending the service life.

[0004] The purpose of the utility model is achieved as follows: a closed liquid level sensor, including a skeleton, a lever bracket connected to the skeleton, a float rod installed on the lever bracket, the lever bracket extending into the skeleton and connected to a reed bracket, a reed body installed on the reed bracket, the reed body and the resistor inside the skeleton are arranged corresponding to the resistor sheet, characterized in that a raised mounting cylinder is provided on the upper part of the skeleton, a rotating shaft is provided on the lever bracket, an inner sleeve is provided on the outer periphery of the rotating shaft, an outer sleeve is provided on the inner wall of the mounting cylinder corresponding to the inner sleeve, the rotating shaft cooperates to extend into the mounting cylinder, the inner sleeve cooperates to be inserted into the outer sleeve and is rotatably connected with the outer sleeve, and insulating grease is provided at the upper and lower ends of the inner sleeve and the outer sleeve inside the mounting cylinder.

[0005] The connection mode between the connecting column connecting piece and the skeleton of the utility model is interference fit, the rotating connection between the lever bracket and the skeleton is provided with inner and outer metal sleeves, and solid insulating grease is injected into the upper and lower ends of the inner and outer sleeves to achieve the effect of sealing; the inner sleeve is injection molded on the lever bracket, and the inner sleeve is fixed on the rotating shaft of the lever bracket with radial holes to prevent the inner sleeve from moving circumferentially, and the inner and outer metal sleeves are coated with oil to reduce friction; the closed liquid level sensor of the utility model is used to detect the oil level in the oil tank. When working, the sensor skeleton is arranged in the oil tank, the float rod changes its position according to the change of the oil level, the float rod drives the lever bracket to rotate, the inner sleeve on the rotating shaft rotates relative to the outer sleeve, the inner and outer metal sleeves are coated with oil to reduce friction, the outer sleeve is fixed on the skeleton, and the solid insulating grease at the upper and lower ends of the inner and outer sleeves plays a sealing role, the rotating shaft drives the reed bracket to rotate, the contact position of the reed body and the resistor sheet changes, and the resistance value changes to reflect the change of the oil level. Compared with the prior art, the beneficial effect of the utility model is that it can avoid the long-term rotation and easy wear of the connection between the lever bracket and the skeleton to cause oil leakage, and prolong the service life. The utility model can also be used to detect the liquid level changes of other liquids.

[0006] As a further improvement of the present invention, the rotating shaft is perpendicular to the surface of the lever bracket, the lever bracket faces the end face of the mounting tube, an arc-shaped guide block is provided at the upper end of the mounting tube, an arc-shaped guide groove is provided on the lower side of the lever bracket corresponding to the guide block, the guide block is inserted into the guide groove, the circumferential length of the guide groove is greater than the circumferential length of the guide block, the rotating shaft includes an upper large-diameter shaft section and a lower small-diameter shaft section, and the large-diameter shaft section is arranged corresponding to the inner wall of the mounting tube.

[0007] As a further improvement of the utility model, the float rod includes a fixed section and an insertion section, and the lever bracket is provided with a plurality of claws spaced along the length direction of the fixed section of the float rod, each claw clamps the fixed section of the float rod, and an insertion hole is axially opened on the rotating shaft, and the insertion section of the float rod is inserted into the insertion hole. The float rod and the lever bracket keep synchronous movement.

[0008] As a further improvement of the utility model, the outer circumference of the small diameter shaft section of the rotating shaft is provided with an annular mounting groove, the inner sleeve is sleeved on the mounting groove, at least two radial positioning rods are evenly arranged on the outer circumference of the small diameter shaft section of the rotating shaft, a plurality of positioning holes are provided on the inner sleeve corresponding to each positioning rod, and the positioning rods are inserted into the corresponding positioning holes. The inner sleeve is injection molded on the small diameter shaft section of the rotating shaft of the lever bracket, and the inner sleeve rotates synchronously with the rotating shaft.

[0009] As a further improvement of the utility model, a lower boss is arranged inside the skeleton corresponding to the rotating shaft, the center hole of the lower boss connects the mounting tube and the inside of the skeleton, the small diameter shaft section of the rotating shaft is inserted into the center hole of the lower boss, and a positioning bracket 1 and a positioning bracket 2 are arranged at the lower end of the small diameter shaft section of the rotating shaft respectively, and a limiting stopper is arranged at the lower end of the positioning bracket 2, and a positioning groove 1 and a positioning groove 2 are opened on the spring bracket corresponding to the positioning bracket 1 and the positioning bracket 2 respectively, the positioning bracket 1 passes through the positioning groove 1 and the outer periphery of the positioning bracket 1 matches the inner wall of the positioning groove 1, the positioning bracket 2 passes through the positioning groove 2 and the outer periphery of the positioning bracket 2 matches the inner wall of the positioning groove 2, the limiting stopper is blocked against the lower side of the spring bracket, and the upper surface of the spring bracket is arranged corresponding to the lower surface of the lower boss. The positioning groove one is rectangular, the positioning groove two is trapezoidal, the positioning groove one and the positioning groove two are connected, the positioning bracket one and the positioning bracket two are stuck in the positioning groove one and the positioning groove two, the rotating shaft and the spring bracket rotate synchronously, the lever bracket faces the end face of the mounting tube, the spring bracket faces the lower boss, and the lever bracket will not move axially.

[0010] As a further improvement of the utility model, the insulating grease is in solid state, the large diameter shaft section of the rotating shaft is located above the insulating grease at the upper end, the lower boss is located below the insulating grease at the lower end, an annular inner step close to the lower end of the outer sleeve is provided on the inner wall or the frame of the mounting cylinder, and anti-friction lubricating oil is provided between the inner sleeve and the outer sleeve. Oil is applied between the inner and outer metal sleeves to reduce friction.

[0011] As a further improvement of the utility model, the resistor sheet is arranged on the upper inner wall of the frame, a baffle is arranged on the lower side of the frame, two metal connecting posts are arranged on the frame, the two connecting posts are respectively connected to the two metal connecting sheets, and the other ends of the two connecting sheets are connected to the resistor sheet; a through hole is provided on the connecting sheet for the connecting post to pass through, and a plurality of blocks for locking the corresponding connecting posts are evenly arranged in the circumferential direction of the through hole. The two connecting posts are connected to the resistance detection system to measure the change of the resistance value.

[0012] In order to facilitate the installation of the sensor, at least two left-right symmetrical outer brackets are arranged on the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model when it is placed vertically for use.

[0014] Figure 2 for Figure 1 AA section view.

[0015] Figure 3 This is a three-dimensional structural diagram of the lever bracket.

[0016] Figure 4 Schematic diagram of the internal structure of the skeleton.

[0017] Figure 5This is a diagram showing the position relationship between the spring bracket and the rotating axis in the frame.

[0018] Figure 6 This is a three-dimensional structural diagram of the lever bracket.

[0019] Figure 7 It is a schematic diagram of the structure for installing the cylinder guide block.

[0020] Figure 8 It is a schematic diagram of the structure of two connecting columns and a connecting piece.

[0021] Fig. 9 It is a three-dimensional structural diagram of the utility model.

[0022] Fig.10 for Fig. 9 A partial enlarged view of .

[0023] Among them, 1 skeleton, 2 lever bracket, 2a rotating shaft, 2a1 large diameter shaft section, 2a2 small diameter shaft section, 3 float rod, 3a fixed section, 3b insertion section, 301 float, 4 reed bracket, 5 reed body, 6 resistor, 7 mounting tube, 8 inner sleeve, 9 outer sleeve, 10 claw, 11 insertion hole, 12 mounting groove, 13 positioning rod, 14 lower boss, 14a center hole, 15 positioning bracket one, 16 positioning bracket two, 16a limit stopper, 17 positioning groove one, 18 positioning groove two, 19 inner step, 20 cover, 21 connecting column, 22 connecting plate, 23 block, 24 outer bracket, 25 guide block, 26 guide groove. DETAILED DESCRIPTION

[0024] like Figure 1-10 As shown, a closed liquid level sensor includes a skeleton 1, a lever bracket 2 is connected to the skeleton 1, a float rod 3 is installed on the lever bracket 2, the lever bracket 2 extends into the skeleton 1 and is connected to a reed bracket 4, a reed body 5 is installed on the reed bracket 4, and the reed body 5 is arranged corresponding to the resistor 6 inside the skeleton 1, and is characterized in that a raised mounting cylinder 7 is provided on the upper part of the skeleton 1, a rotating shaft 2a is provided on the lever bracket 2, an inner sleeve 8 is provided on the outer periphery of the rotating shaft 2a, an outer sleeve 9 is provided on the inner wall of the mounting cylinder 7 corresponding to the inner sleeve 8, the rotating shaft 2a cooperates to extend into the mounting cylinder 7, the inner sleeve 8 cooperates to be inserted into the outer sleeve 9 and is rotatably connected with the outer sleeve 9, and insulating grease is provided at the upper and lower ends of the inner sleeve 8 and the outer sleeve 9 inside the mounting cylinder 7.

[0025] The rotating shaft 2a is perpendicular to the surface of the lever bracket 2. The lever bracket 2 faces the end surface of the mounting tube 7. The upper end of the mounting tube 7 is provided with an arc-shaped guide block 25. The lower side of the lever bracket 2 is provided with an arc-shaped guide groove 26 corresponding to the guide block 25. The guide block 25 is inserted into the guide groove 26 in cooperation. The circumferential length of the guide groove 26 is greater than the circumferential length of the guide block 25. The rotating shaft 2a includes an upper large-diameter shaft section 2a1 and a lower small-diameter shaft section 2a2. The large-diameter shaft section 2a1 is arranged corresponding to the inner wall of the mounting tube 7. The float rod 3 includes a fixed section 3a and an insertion section 3b. The lever bracket 2 is provided with a plurality of claws 10 spaced along the length direction of the fixed section 3a of the float rod 3. Each claw 10 clamps the fixed section 3a of the float rod 3. An insertion hole 11 is axially provided on the rotating shaft 2a. The insertion section 3b of the float rod 3 is inserted into the insertion hole 11 in cooperation. A float 301 floating on the liquid surface is provided at the end of the fixed section 3a of the float rod 3. The float rod 3 and the lever bracket 2 keep moving synchronously.

[0026] An annular mounting groove 12 is provided on the outer circumference of the small diameter shaft section 2a2 of the rotating shaft 2a, and the inner sleeve 8 is sleeved on the mounting groove 12. At least two radial positioning rods 13 are evenly distributed on the outer circumference of the small diameter shaft section 2a2 of the rotating shaft 2a, and a plurality of positioning holes are provided on the inner sleeve 8 corresponding to each positioning rod 13, and the positioning rods 13 are inserted into the corresponding positioning holes. The inner sleeve 8 is injection molded on the small diameter shaft section 2a2 of the rotating shaft 2a of the lever bracket 2, and the inner sleeve 8 rotates synchronously with the rotating shaft 2a.

[0027] A lower boss 14 is provided inside the skeleton 1 corresponding to the rotating shaft 2a, and the center hole 14a of the lower boss 14 connects the mounting tube 7 and the inside of the skeleton 1. The small-diameter shaft section 2a2 of the rotating shaft 2a is inserted into the center hole 14a of the lower boss 14. A positioning bracket 15 and a positioning bracket 2 16 are provided at the lower end of the small-diameter shaft section 2a2 of the rotating shaft 2a, respectively. A limiting stopper 16a is provided at the lower end of the positioning bracket 2 16. A positioning groove 17 and a positioning groove 2 18 are provided on the spring bracket 4 corresponding to the positioning bracket 15 and the positioning bracket 2 16, respectively. The positioning bracket 15 passes through the positioning groove 17 and the outer periphery of the positioning bracket 15 matches the inner wall of the positioning groove 17. The positioning bracket 2 16 passes through the positioning groove 2 18 and the outer periphery of the positioning bracket 2 16 matches the inner wall of the positioning groove 2 18. The limiting stopper 16a blocks the lower side of the spring bracket 4, and the upper surface of the spring bracket 4 is provided corresponding to the lower surface of the lower boss 14. The positioning groove 17 is rectangular, the positioning groove 2 18 is trapezoidal, the positioning groove 17 and the positioning groove 2 18 are connected, the positioning bracket 15 and the positioning bracket 2 16 are stuck in the positioning groove 17 and the positioning groove 2 18, the rotating shaft 2a rotates synchronously with the spring bracket 4, the lever bracket 2 faces the end face of the mounting tube 7, the spring bracket 4 faces the lower boss, and the lever bracket 2 will not move axially.

[0028] The insulating grease is in solid state, the large diameter shaft section 2a1 of the rotating shaft 2a is located above the insulating grease at the upper end, the lower boss 14 is located below the insulating grease at the lower end, an annular inner step 19 is provided on the inner wall of the mounting cylinder 7 or the frame 1, and the lower end of the outer sleeve 9 is abutted, and anti-friction lubricating oil is provided between the inner sleeve 8 and the outer sleeve 9. The inner and outer metal sleeves are coated with oil to reduce friction.

[0029] The resistor sheet 6 is arranged on the upper inner wall of the frame 1, and a cover 20 is arranged on the lower side of the frame 1. The frame 1 is provided with two metal connecting posts 21 extending into the frame 1, and the two connecting posts 21 are respectively connected to two metal connecting sheets 22, and the other ends of the two connecting sheets 22 are connected to the resistor sheet 6; the connecting sheets 22 are provided with through holes for the connecting posts 21 to pass through, and a number of blocks 23 for locking the corresponding connecting posts 21 are evenly arranged in the circumferential direction of the through holes. The two connecting posts 21 are connected to the resistance detection system to measure the change of the resistance value.

[0030] In order to facilitate the installation of the sensor, at least two left-right symmetrical outer brackets 24 are provided on the frame 1 .

[0031] The connection between the connecting column 21, the connecting piece 22 and the skeleton 1 of the utility model is an interference fit. The rotating connection between the lever bracket 2 and the skeleton 1 is provided with inner and outer metal sleeves, and solid insulating grease is injected into the upper and lower ends of the inner and outer sleeves 9 to achieve a sealing effect; the inner sleeve 8 is injection molded on the lever bracket 2, and the inner sleeve 8 is fixed on the rotating shaft 2a of the lever bracket 2 with radial holes to prevent the inner sleeve 8 from moving circumferentially, and the inner and outer metal sleeves are coated with oil to reduce friction; the closed liquid level sensor of the utility model is used to detect the oil level in the oil tank. When working, the sensor skeleton is arranged in the oil tank, the float rod 3 changes its position according to the change of the oil level, the float rod 3 drives the lever bracket 2 to rotate, the inner sleeve 8 on the rotating shaft 2a rotates relative to the outer sleeve 9, and the inner and outer metal sleeves are coated with oil to reduce friction, the outer sleeve 9 is fixed on the skeleton 1, and the solid insulating grease at the upper and lower ends of the inner and outer sleeves 9 plays a sealing role, the rotating shaft 2a drives the reed bracket 4 to rotate, the contact position of the reed body 5 and the resistor 6 changes, and the change of the resistance value reflects the change of the oil level. The utility model has the advantages that it can avoid the long-term rotation and wear of the connection between the lever bracket 2 and the frame 1, thereby preventing oil leakage and extending the service life. The utility model can also be used to detect the level changes of other liquids.

[0032] 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 liquid level sensor, comprising a frame, a lever bracket connected to the frame, a float rod mounted on the lever bracket, the lever bracket extending into the frame and connected to a reed bracket, a reed body mounted on the reed bracket, the reed body being arranged corresponding to a resistor sheet inside the frame, characterized in that: A raised mounting tube is provided on the upper part of the skeleton, a rotating shaft is provided on the lever bracket, an inner sleeve is provided on the outer periphery of the rotating shaft, an outer sleeve is provided on the inner wall of the mounting tube corresponding to the inner sleeve, the rotating shaft cooperates to extend into the mounting tube, the inner sleeve cooperates to be inserted into the outer sleeve and is rotatably connected to the outer sleeve, and insulating grease is provided at the upper and lower ends of the inner sleeve and the outer sleeve inside the mounting tube.

2. A closed liquid level sensor according to claim 1, characterized in that: The rotating shaft is perpendicular to the surface of the lever bracket, the lever bracket faces the end face of the mounting tube, an arc-shaped guide block is provided at the upper end of the mounting tube, an arc-shaped guide groove is provided on the lower side of the lever bracket corresponding to the guide block, the guide block is inserted into the guide groove, the circumferential length of the guide groove is greater than the circumferential length of the guide block, the rotating shaft includes an upper large-diameter shaft section and a lower small-diameter shaft section, and the large-diameter shaft section is arranged corresponding to the inner wall of the mounting tube.

3. A closed liquid level sensor according to claim 2, characterized in that: The float rod comprises a fixed section and an insertion section. The lever bracket is provided with a plurality of claws spaced along the length direction of the fixed section of the float rod. Each claw clamps the fixed section of the float rod. An insertion hole is axially opened on the rotating shaft, and the insertion section of the float rod is inserted into the insertion hole.

4. A closed liquid level sensor according to claim 2 or 3, characterized in that: An annular mounting groove is provided on the outer circumference of the small diameter shaft section of the rotating shaft, and the inner sleeve is sleeved on the mounting groove. At least two radial positioning rods are evenly distributed on the outer circumference of the small diameter shaft section of the rotating shaft, and a plurality of positioning holes are provided on the inner sleeve corresponding to each positioning rod, and the positioning rods are inserted into the corresponding positioning holes.

5. A closed liquid level sensor according to claim 2 or 3, characterized in that: A lower boss is arranged inside the skeleton corresponding to the rotating shaft, and the center hole of the lower boss connects the mounting tube and the inside of the skeleton, and the small-diameter shaft section of the rotating shaft is inserted into the center hole of the lower boss, and a positioning bracket 1 and a positioning bracket 2 are arranged at the lower end of the small-diameter shaft section of the rotating shaft, respectively, and a limiting stopper is arranged at the lower end of the positioning bracket 2, and a positioning groove 1 and a positioning groove 2 are respectively opened on the spring bracket corresponding to the positioning bracket 1 and the positioning bracket 2, the positioning bracket 1 passes through the positioning groove 1 and the outer periphery of the positioning bracket 1 matches the inner wall of the positioning groove 1, the positioning bracket 2 passes through the positioning groove 2 and the outer periphery of the positioning bracket 2 matches the inner wall of the positioning groove 2, the limiting stopper is blocked against the lower side of the spring bracket, and the upper surface of the spring bracket is arranged corresponding to the lower surface of the lower boss.

6. A closed liquid level sensor according to claim 5, characterized in that: The insulating grease is in solid state, the large diameter shaft section of the rotating shaft is located above the upper end insulating grease, the lower boss is located below the lower end insulating grease, an annular inner step close to the lower end of the outer sleeve is provided on the inner wall or frame of the mounting cylinder, and anti-friction lubricating oil is provided between the inner sleeve and the outer sleeve.

7. A closed liquid level sensor according to any one of claims 1 to 3, characterized in that: The resistor sheet is arranged on the upper inner wall of the frame, and a blocking cover is arranged on the lower side of the frame. The frame is provided with two metal connecting columns extending into the frame, and the two connecting columns are respectively connected to the two metal connecting sheets, and the other ends of the two connecting sheets are connected to the resistor sheet; a through hole for accommodating the connecting column to pass through is opened on the connecting sheet, and a number of blocks for locking the corresponding connecting columns are evenly distributed in the circumference of the through hole.

8. A closed liquid level sensor according to any one of claims 1 to 3, characterized in that: At least two left-right symmetrical external supports are arranged on the frame.

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