Fully-sealed liquid level sensor convenient to assemble and disassemble

Abstract

The utility model discloses a fully-sealed liquid level sensor convenient to assemble and disassemble, and relates to a liquid level sensor device. The device comprises a shell, a cover plate and a connector, a filtering plate, a control plate, a pressing plate and a sensor assembly are sequentially arranged in the shell from top to bottom. The filter plate is connected with the lower surface of the cover plate through a first special bolt; the control panel is connected with the lower surface of the filter plate through a second special bolt; the contact pin on the filter board is connected with the socket on the control board; the pressing plate is fixedly connected with the shell through a screw; the sensor assembly is located on the upper surface of the bottom of the shell and pressed by the pressing plate. The connecting structure is simple in structural design, the fastening mode is screw connection, and later disassembly and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to a liquid level sensor device, and more specifically, it is a fully sealed and conveniently detachable and installable liquid level sensor. Background Art

[0002] With the development of automation and intelligence, automatic monitoring devices have been widely used in the high-end industrial field. Among them, the liquid level monitoring sensor for aircraft water tanks is even included, which is of great significance for maintaining the normal operation of the aircraft water and wastewater system. In view of the characteristics such as easy leakage at the wastewater contact point and limited installation space, more stringent requirements are imposed on the sealing performance and reliability of the liquid level sensor.

[0003] Currently, the seals of sensors generally adopt the form of gaskets or glue bonding. Being exposed to the external environment for a long time easily causes problems such as the gasket losing elasticity or the glue cracking; moreover, the structures of most sensors are complexly designed, resulting in great difficulties in on-site disassembly and maintenance, and they are not suitable for measuring the liquid level height and later maintenance in a limited space.

[0004] Therefore, in view of the measurement of the liquid level height in the aerospace water tank, it is necessary to develop a conveniently detachable and installable liquid level sensor with high sealing reliability. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the above background art, and provide a fully sealed and conveniently detachable and installable liquid level sensor.

[0006] To achieve the above purpose, the technical solution of the utility model is: a fully sealed and conveniently detachable and installable liquid level sensor, which is characterized in that: it includes a housing, a cover plate screwed and fastened to the upper end surface of the housing, and a connector inserted into the middle opening of the cover plate;

[0007] A filter board, a control board, a pressure plate and a sensor assembly are sequentially arranged in the housing from top to bottom;

[0008] The filter board is connected to the lower surface of the cover plate by a first special bolt;

[0009] The control board is connected to the lower surface of the filter board by a second special bolt;

[0010] The pins on the filter board are connected to the sockets on the control board;

[0011] The pressure plate is fastened to the housing by screws;

[0012] The sensor assembly is located on the upper surface of the bottom of the housing and is pressed by the pressure plate.

[0013] In the above technical solution, thread joints are provided at the upper ends of the first special bolt and the second special bolt, and thread blind holes are provided at the lower ends.

[0014] In the above technical solution, a first threaded through hole is provided on the upper end of the housing along the circumferential direction, and a wedge-shaped flange is provided on the outer part of the upper middle of the housing along the circumferential direction;

[0015] A first through hole is provided on the outer side of the upper end of the cover plate along the circumferential direction, and the first through hole is fixedly connected to the first threaded through hole by a screw with a safety hole; a fuse is wound around the screw.

[0016] In the above technical solution, a second threaded through hole is provided on the inner part of the lower middle of the housing along the circumferential direction, a second through hole is provided on the outer side of the pressing plate along the circumferential direction, and the second through hole is fixedly connected to the second threaded through hole by a screw.

[0017] In the above technical solution, a first rectangular groove is formed on the upper surface of the bottom end of the housing, a washer is provided at the lower end of the sensor assembly, and the washer and the first rectangular groove are pressed to form a seal.

[0018] In the above technical solution, a second rectangular groove is formed on the outer side of the cover plate along the circumferential direction, an O-ring seal is arranged in the second rectangular groove, and the O-ring seal in the second rectangular groove and the inner side surface of the housing are pressed to form a seal.

[0019] In the above technical solution, a third rectangular groove is formed on the connector, an O-ring seal is arranged in the third rectangular groove, and the O-ring seal in the third rectangular groove and the lower surface of the cover plate are pressed to form a seal.

[0020] In the above technical solution, a cover plate thread blind hole is provided on the bottom surface of the cover plate, the thread joint at the upper end of the first special bolt is connected to the cover plate thread blind hole, and the thread joint at the upper end of the second special bolt penetrates through the filter plate and is connected to the thread blind hole at the lower end of the first special bolt;

[0021] The lower surface of the control board is connected to the thread blind hole at the lower end of the second special bolt by a screw.

[0022] In the above technical solution, the second threaded through holes are distributed along the circumferential direction of the top of the sensor assembly;

[0023] A connecting wire is provided on the sensor assembly, and the connecting wire is welded to the control board.

[0024] In the above technical solution, an adjusting gasket is arranged between the filter plate and the cover plate; an adjusting gasket is arranged between the control board and the filter plate.

[0025] Compared with the prior art, the present utility model has the following advantages:

[0026] 1) The structure design of the utility model is simple, and the fastening method is screw connection, which is convenient for later disassembly and maintenance.

[0027] 2) The sealing measures of the utility model all adopt the form of an internal sealing ring, and its sealing reliability is high;

[0028] 3) The utility model fixes the liquid level sensor and the external interface through a clamp, and the product installation is simple and fast.

[0029] 4) The utility model can be conveniently installed and disassembled with the external interface. At the same time, the structure design is simple, which effectively improves the maintenance efficiency. The liquid level sensor has strict sealing performance and high sealing reliability.

[0030] 5) The utility model meets the airworthiness requirements, has a simple and reliable structure, strong practicability, perfect functions, and is easy to use and promote. Brief Description of the Drawings

[0031] Figure 1 is the overall cross-sectional schematic diagram of the utility model.

[0032] Figure 2 is the structural schematic diagram of the housing.

[0033] Figure 3 is Figure 2 the cross-sectional view at A in

[0034] Figure 4 is the structural schematic diagram of the cover plate.

[0035] Figure 5 is Figure 4 the structural schematic diagram at B in

[0036] Figure 6 is the structural schematic diagram of the connector.

[0037] Figure 7 is the structural schematic diagram of the circuit board.

[0038] Figure 8 is the structural schematic diagram of the first special bolt and the second special bolt.

[0039] Figure 9 is the structural schematic diagram of the pressing plate.

[0040] Figure 10 is the structural schematic diagram of the sensor assembly.

[0041] Among them, 1 - housing, 11 - first threaded through - hole, 12 - wedge - shaped flange, 13 - second threaded through - hole, 14 - first rectangular groove, 2 - cover plate, 21 - first through - hole, 22 - second rectangular groove, 23 - blind threaded hole of the cover plate, 3 - connector, 31 - third rectangular groove, 4 - filter plate, 41 - pin, 5 - control board, 51 - socket, 6 - pressure plate, 61 - second through - hole, 7 - sensor assembly, 71 - washer, 72 - connecting wire, 81 - first special bolt, 82 - second special bolt, 83 - threaded joint, 84 - blind threaded hole, 9 - O - ring seal. Detailed implementation manners

[0042] The implementation of the present utility model will be described in detail below with reference to the accompanying drawings. However, they do not constitute a limitation to the present utility model and are only for illustration purposes. At the same time, the advantages of the present utility model will become clearer and easier to understand through the description.

[0043] Referring to the accompanying drawings, it can be seen that: a fully - sealed and convenient - loading - and - unloading liquid - level sensor, characterized in that: it includes a housing 1, a cover plate 2 screwed and fastened to the upper end surface of the housing 1, and a connector 3 inserted into the middle opening of the cover plate 2;

[0044] A filter plate 4, a control board 5, a pressure plate 6 and a sensor assembly 7 are sequentially arranged in the housing 1 from top to bottom;

[0045] The filter plate 4 is connected to the lower surface of the cover plate 2 by a first special bolt 81;

[0046] The control board 5 is connected to the lower surface of the filter plate 4 by a second special bolt 82;

[0047] The pin 41 on the filter plate 4 is connected to the socket 51 on the control board 5;

[0048] The pressure plate 6 is fastened to the housing 1 by screws;

[0049] The sensor assembly 7 is located on the upper surface of the bottom of the housing 1 and is pressed by the pressure plate 6.

[0050] Threaded joints 83 are provided at the upper ends of both the first special bolt 81 and the second special bolt 82, and blind threaded holes 84 are provided at the lower ends of both.

[0051] The upper end of the housing 1 is provided with first threaded through - holes 11 along the circumferential direction, and the outer side of the upper - middle part of the housing 1 is provided with a wedge - shaped flange 12 along the circumferential direction;

[0052] The upper - end outer side of the cover plate 2 is provided with first through - holes 21 along the circumferential direction. The first through - holes 21 and the first threaded through - holes 11 are fastened and connected by screws with safety holes; a fuse is wound around the screws to prevent the screws and nuts from loosening.

[0053] Inside the lower end of the housing 1, a second threaded through-hole 13 is provided along the circumferential direction. On the outer side of the pressing plate 6, a second through-hole 61 is provided along the circumferential direction. The second through-hole 61 and the second threaded through-hole 13 are fixedly connected by screws.

[0054] On the upper surface of the bottom end of the housing 1, a first rectangular groove 14 is opened. At the lower end of the sensor assembly 7, a washer 71 is provided. The washer 71 and the first rectangular groove 14 are pressed to form a seal, ensuring the overall sealing of the liquid level sensor.

[0055] On the outer side of the cover plate 2, a second rectangular groove 22 is opened along the circumferential direction. An O-ring seal 9 is arranged in the second rectangular groove 22. The O-ring seal 9 in the second rectangular groove 22 and the inner surface of the housing 1 are pressed to form a seal.

[0056] On the connector 3, a third rectangular groove 31 is opened. An O-ring seal 9 is arranged in the third rectangular groove 31. The O-ring seal 9 in the third rectangular groove 31 and the lower surface of the cover plate 2 are pressed to form a seal.

[0057] On the bottom surface of the cover plate 2, a threaded blind hole 23 of the cover plate is provided. The threaded joint 83 at the upper end of the first special bolt 81 is connected to the threaded blind hole 23 of the cover plate. The threaded joint 83 at the upper end of the second special bolt 82 passes through the filter plate 4 and is connected to the threaded blind hole 84 at the lower end of the first special bolt 81;

[0058] The lower surface of the control board 5 is connected to the threaded blind hole 84 at the lower end of the second special bolt 82 by screws.

[0059] The second threaded through-holes 13 are distributed along the circumferential direction of the top of the sensor assembly 7;

[0060] On the sensor assembly 7, a connecting wire 72 is provided. The connecting wire 72 is welded to the control board 5 to realize power supply access and signal transmission.

[0061] Adjusting washers are arranged between the filter plate 4 and the cover plate 2; adjusting washers are arranged between the control board 5 and the filter plate 4.

[0062] In actual use, the housing 1 is integrally machined from a bar stock to ensure its own strength; the cover plate 2 is integrally machined from a bar stock to ensure its own strength.

[0063] The wedge-shaped flange 12 contacts the flange with a sealing ring at the water tank interface. The liquid level sensor is fixed at the water tank interface by clamping and locking, realizing the quick installation and disassembly of the liquid level sensor.

[0064] The second threaded through-hole 13 is a partial convex structure and does not extend to the bottom surface of the housing 1, which can reduce the weight of the product while realizing the bolt fastening function; the lower surface of the pressure plate 6 restricts the axial displacement of the sensor assembly 7, and at the same time, the second threaded through-hole 13 restricts the radial displacement of the sensor assembly 7.

[0065] The connector 3 is fastened to the lower surface of the cover plate 2 by a matching nut, and a fuse is wound inside the matching nut to prevent the screw and the nut from loosening.

[0066] The height difference between the filter board 4 and the cover plate 2 can be adjusted secondarily by adding adjustment gaskets of different thicknesses to ensure that the pins of the connector 3 are welded tightly to the pin holes of the filter board 4; the height difference between the control board 5 and the filter board 4 can be adjusted secondarily by adding adjustment gaskets of different thicknesses to ensure that the pins 41 on the filter board 4 are closely matched with the sockets 51 on the control board 5, which avoids the redundant wire connection method and greatly reduces the layout space.

[0067] The first special bolt 81 and the second special bolt 82 both have the functions of a bolt and a nut and are suitable for fastening connections in limited spaces.

[0068] Other parts not described belong to the prior art.

Claims

1. A fully sealed and conveniently loadable and unloadable liquid level sensor, characterized in that: It includes a housing (1), a cover plate (2) screwed and fastened to the upper end surface of the housing (1), and a connector (3) inserted into the middle opening of the cover plate (2) at the bottom; Inside the housing (1), a filter plate (4), a control board (5), a pressing plate (6), and a sensor assembly (7) are sequentially arranged from top to bottom; The filter plate (4) is connected to the lower surface of the cover plate (2) by a first special bolt (81); The control board (5) is connected to the lower surface of the filter plate (4) by a second special bolt (82); The pins (41) on the filter plate (4) are connected to the sockets (51) on the control board (5); The pressing plate (6) is fastened to the housing (1) by screws; The sensor assembly (7) is located on the upper surface of the bottom of the housing (1) and is pressed by the pressing plate (6).

2. The fully enclosed and conveniently detachable and installable liquid level sensor according to claim 1, wherein: Threaded joints (83) are provided at the upper ends of the first special bolt (81) and the second special bolt (82), and threaded blind holes (84) are provided at the lower ends.

3. The fully sealed and conveniently detachable and installable liquid level sensor according to claim 1, wherein: A first threaded through hole (11) is provided along the circumferential direction at the upper end of the housing (1), and a wedge-shaped flange (12) is provided outside the middle upper part of the housing (1) along the circumferential direction; A first through hole (21) is provided along the circumferential direction on the outer side of the upper end of the cover plate (2), and the first through hole (21) is fastened and connected to the first threaded through hole (11) by a screw with a safety hole; A fuse is wound around the screw.

4. A fully sealed and conveniently detachable and installable liquid level sensor according to claim 3, characterized in that: A second threaded through hole (13) is provided along the circumferential direction inside the middle lower part of the housing (1), a second through hole (61) is provided along the circumferential direction on the outer side of the pressing plate (6), and the second through hole (61) is fastened and connected to the second threaded through hole (13) by a screw.

5. The fully enclosed and conveniently detachable liquid level sensor according to claim 4, wherein: A first rectangular groove (14) is opened on the upper surface of the bottom end of the housing (1), a washer (71) is provided at the lower end of the sensor assembly (7), and the washer (71) forms a seal by extrusion with the first rectangular groove (14).

6. The fully sealed and conveniently detachable and installable liquid level sensor according to claim 5, characterized in that: A second rectangular groove (22) is opened along the circumferential direction on the outer side of the cover plate (2), an O-ring (9) is arranged in the second rectangular groove (22), and the O-ring (9) in the second rectangular groove (22) forms a seal by extrusion with the inner surface of the housing (1).

7. The fully sealed and conveniently detachable and installable liquid level sensor according to claim 6, wherein: A third rectangular groove (31) is opened on the connector (3), an O-ring (9) is arranged in the third rectangular groove (31), and the O-ring (9) in the third rectangular groove (31) forms a seal by extrusion with the lower surface of the cover plate (2).

8. A fully sealed and conveniently detachable and installable liquid level sensor according to claim 1, characterized in that: Threaded blind holes (23) are provided on the bottom surface of the cover plate (2), the threaded joint (83) at the upper end of the first special bolt (81) is connected to the threaded blind holes (23) of the cover plate, and the threaded joint (83) at the upper end of the second special bolt (82) penetrates through the filter plate (4) and is connected to the threaded blind hole (84) at the lower end of the first special bolt (81); The lower surface of the control board (5) is connected to the threaded blind hole (84) at the lower end of the second special bolt (82) by a screw.

9. A fully sealed and conveniently loadable and unloadable liquid level sensor according to claim 1, characterized in that: The second threaded through holes (13) are distributed along the circumferential direction of the top of the sensor assembly (7); A connecting wire (72) is provided on the sensor assembly (7), and the connecting wire (72) is welded to the control board (5).

10. A fully sealed and conveniently detachable and installable liquid level sensor according to claim 1, characterized in that: Adjusting gaskets are provided between the filter board (4) and the cover board (2); adjusting gaskets are provided between the control board (5) and the filter board (4).

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