A multi-point output top-mounted float level switch

Abstract

The utility model relates to the technical field of float level switch, specifically a multi-point output type top-mounted float level switch, including a junction box assembly, the junction box assembly is assembled through a pressure tube assembly, a switch assembly is installed in the junction box assembly, the switch assembly and the pressure tube assembly are fixed through a gasket assembly, a push rod assembly is threadedly connected to the pressure tube assembly, and the lower joint of the push rod assembly passes through the lower spring frame and is connected to the wire rope assembly through a locking assembly. The switch element of this device adopts a high-power reed switch, which interacts with the magnetic field generated by the magnetic steel at the top of the push rod to achieve a self-holding function. The reed switch and the small magnetic steel outside it are encapsulated in an aluminum tube with high-temperature resin glue to become a self-holding switch element. Two self-holding switch elements are installed at the same height of different mounting plates, and the upper and lower positions are fine-tuned to make their action points consistent, so that DPDT output can be easily achieved. The frame of the switch assembly is placed with 1 to 3 self-holding switch elements to achieve multi-point output.

Description

Technical Field

[0001] The utility model relates to the technical field of float liquid level switches, in particular to a multi-point output top-mounted float liquid level switch. Background Art

[0002] The float level switch is composed of a float, stainless steel cable, spring and switch assembly. The basic principle is: the float is partially or completely immersed in the liquid, and the change of liquid level or interface position causes the change of buoyancy of the float, thereby changing the magnitude of the force on the lower end of the spring, and the length of the spring changes accordingly, driving the push rod fixed at the free end of the spring to move up and down, and the magnet on the top of the push rod drives the magnet of the switch assembly to rotate, thereby driving the switch contacts to open and close.

[0003] The float level switch has a self-holding function: when the liquid level rises to the switch position, the switch operates and the contact state changes; the liquid level continues to rise and the switch state is maintained; when the liquid level drops to the switch position, the switch state is reset.

[0004] This type of float level switch usually controls 1~2 points, and the switch element usually adopts micro switch or three-magnetic switch. If DPDT double-pole double-throw output is required, the micro switch type uses one cam to drive two micro switches at the same time, while the three-magnetic switch type installs two switch components at the same position to achieve it.

[0005] When the number of control points exceeds 3, on the one hand, the internal installation space of the junction box is limited, and on the other hand, since the hysteresis of each point is relatively large, the spring travel may not be enough. A multi-point output top-mounted float level switch is needed to solve this problem. Utility Model Content

[0006] The utility model aims to provide a multi-point output type top-mounted float liquid level switch to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-point output top-mounted float liquid level switch, comprising a junction box assembly, which is assembled through a pressure tube assembly, a switch assembly is installed in the junction box assembly, the switch assembly and the pressure tube assembly are fixed by a gasket assembly, a push rod assembly is threadedly connected to the pressure tube assembly, the lower joint of the push rod assembly passes through a lower spring frame and is connected to a wire rope assembly by a locking assembly, the bottom end of the wire rope assembly is tightened to a limit ring assembly by screws, the bottom end of the limit ring assembly is fixedly connected to a float assembly, a mounting plate is installed on the switch assembly, a pull block is installed on the mounting plate, the pull block cooperates with a pressure block, and a self-holding switch element is installed between the pull block and the pressure block.

[0008] As an optimal technical solution of the utility model, the pulling block and the pressing block fix the self-holding switch element by a second hexagon socket screw, the mounting plate is spot welded to the first base, a top fixing block is installed on the mounting plate, and the mounting plate and the top fixing block are assembled by a first hexagon socket screw.

[0009] As a preferred technical solution of the utility model, a wiring terminal is installed on the mounting plate, and the wiring terminal is installed on the mounting plate by a third hexagon socket screw.

[0010] As a preferred technical solution of the utility model, a connecting wire is installed on the self-holding switch element, the bottom end of the connecting wire is connected to an aluminum tube, a reed switch is installed in the aluminum tube and is sealed by filling with inert gas.

[0011] As a preferred technical solution of the utility model, magnetic steel and high-temperature resin glue are respectively installed in the aluminum tube, and a second base is installed at the bottom end of the aluminum tube and is tightly matched with the aluminum tube to form a packaging cavity.

[0012] As a preferred technical solution of the utility model, a gasket and a flange assembly are respectively installed on the pressure pipe assembly, and the junction box assembly is connected and sealed by the gasket and the flange assembly.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] (1) The utility model is a multi-point output type top-mounted float level switch. The switch element of the device adopts a high-power reed switch, which interacts with the magnetic field generated by the magnet on the top of the push rod to achieve a self-holding function. The reed switch and the small magnet outside it are encapsulated in an aluminum tube with high-temperature resin glue to become a self-holding switch element. Two self-holding switch elements are installed at the same height on different mounting plates. The upper and lower positions are fine-tuned to make their operating points consistent, so that DPDT output can be easily achieved. The frame of the switch assembly is placed with 1 to 3 self-holding switch elements to achieve multi-point output. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of a multi-point output top-mounted float liquid level switch according to an embodiment of the utility model;

[0017] Figure 2It is a schematic diagram of the internal structure of a multi-point output top-mounted float liquid level switch according to an embodiment of the utility model;

[0018] Figure 3 The utility model is a schematic structural diagram of a multi-point output type top-mounted float liquid level switch self-holding switch element according to an embodiment of the utility model.

[0019] Reference numerals:

[0020] 1. Junction box assembly; 2. Switch assembly; 3. Pressure tube assembly; 4. Gasket; 5. Flange assembly; 6. Push rod assembly; 7. Locking assembly; 8. Wire rope assembly; 9. Limiting ring assembly; 10. Float assembly; 11. Gasket assembly; 12. Mounting plate; 13. Pull block; 14. Top fixing block; 15. Press block; 16. Terminal block; 17. Self-holding switch element; 18. First base; 19. First hexagon socket screw; 20. Second hexagon socket screw; 21. Third hexagon socket screw; 22. Connecting wire; 23. Aluminum tube; 24. Reed switch; 25. Second base; 26. Magnet; 27. High temperature resin glue. DETAILED DESCRIPTION

[0021] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described: Example

[0022] See also Figure 1 Embodiment 1 is described, including a junction box assembly 1, which is assembled through a pressure tube assembly 3, a switch assembly 2 is installed in the junction box assembly 1, the switch assembly 2 and the pressure tube assembly 3 are fixed by a gasket assembly 11, a push rod assembly 6 is threadedly connected to the pressure tube assembly 3, the lower joint of the push rod assembly 6 passes through the lower spring frame and is connected to the wire rope assembly 8 through a locking assembly 7, the bottom end of the wire rope assembly 8 is tightened to the limit ring assembly 9 by screws, the bottom end of the limit ring assembly 9 is fixedly connected to a buoy assembly 10, a mounting plate 12 is installed on the switch assembly 2, a pull block 13 is installed on the mounting plate 12, the pull block 13 and the pressure block 15 cooperate with each other, a self-holding switch element 17 is installed between the pull block 13 and the pressure block 15, a gasket 4 and a flange assembly 5 are respectively installed on the pressure tube assembly 3, and the junction box assembly 1 is connected and sealed by the gasket 4 and the flange assembly 5;

[0023] In this embodiment, the junction box assembly 1 is composed of a shell, a shell cover, a cable gland, and an O-ring, and is connected and sealed with the flange assembly 5 through the gasket 4. The installed switch assembly 2 is composed of 2 or 3 mounting plates, and a long groove is opened on each mounting plate 12, and 1 to 3 self-holding switch elements 17 can be placed, so that multi-point output can be achieved. Example

[0024] See also Figure 2 to Figure 3Example 2 is described. This embodiment further describes Example 1, including a pull block. The pull block 13 and the pressure block 15 fix the self-holding switch element 17 through the second hexagon socket screw 20. The mounting plate 12 is spot welded with the first base 18. The mounting plate 12 is mounted with a top fixing block 14. The mounting plate 12 and the top fixing block 14 are assembled through the first hexagon socket screw 19. The mounting plate 12 is mounted with a wiring terminal 16. The wiring terminal 16 is mounted on the mounting plate 12 through a third hexagon socket screw 21. A connecting wire 22 is installed on the self-holding switch element 17. The bottom end of the connecting wire 22 is connected to an aluminum tube 23. A reed switch 24 is installed in the aluminum tube 23 and is sealed by filling inert gas. A magnetic steel 26 and a high-temperature resin glue 27 are respectively installed in the aluminum tube 23. A second base 25 is installed at the bottom end of the aluminum tube 23 and is tightly matched with the aluminum tube 23 to form a packaging cavity.

[0025] In the present embodiment, a small magnet is installed on the reed of the reed switch 24, and a self-holding function is realized through the interaction between the reed and the magnetic field generated by the magnet at the top of the push rod. By installing two self-holding switch elements 17 at the same height on different mounting plates and fine-tuning the upper and lower positions to make their operating points consistent, DPDT output can be easily realized.

[0026] In specific applications, the junction box assembly 1 provided in the device is composed of a shell, a shell cover, a cable gland, and an O-ring. When assembled with the pressure pipe assembly 3, it is connected and sealed with the flange assembly 5 through the gasket 4. The installed switch assembly 2 is fixed on the pressure pipe assembly 3 through the gasket assembly 11. The outer end of the switch assembly is installed with a mounting plate 12 assembled by a first hexagon socket screw 19. The frame of the switch assembly 2 is composed of 2 or 3 mounting plates. A long groove is opened on each mounting plate 12, and 1 to 3 self-holding switch elements 17 can be placed, which can achieve Multi-point output, the liquid level switch is set to reduce the action hysteresis. The switch element adopts a high-power reed switch 24, and a small magnet is installed outside the reed of the reed switch 24. The self-holding function is realized through the interaction between the reed switch 24 and the magnetic field generated by the magnet on the top of the push rod. To ensure the performance stability of the switch, the reed switch 24 and the small magnet outside it are encapsulated in an aluminum tube with high-temperature resin glue to become a self-holding switch element 17. Two self-holding switch elements 17 are installed at the same height on different mounting plates. The upper and lower positions are fine-tuned to make their action points consistent, so that DPDT output can be easily realized.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top end", "bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-point output top-mounted float level switch, characterized in that: The invention comprises a junction box assembly (1), wherein the junction box assembly (1) is assembled through a pressure tube assembly (3), a switch assembly (2) is installed in the junction box assembly (1), the switch assembly (2) and the pressure tube assembly (3) are fixed through a gasket assembly (11), a push rod assembly (6) is threadedly connected to the pressure tube assembly (3), a lower joint of the push rod assembly (6) passes through a lower spring frame and is connected to a wire rope assembly (8) through a locking assembly (7), the bottom end of the wire rope assembly (8) is screwed to a limit ring assembly (9), the bottom end of the limit ring assembly (9) is fixedly connected to a buoy assembly (10), a mounting plate (12) is installed on the switch assembly (2), a pull block (13) is installed on the mounting plate (12), the pull block (13) and the pressure block (15) cooperate with each other, and a self-holding switch element (17) is installed between the pull block (13) and the pressure block (15).

2. A multi-point output top-mounted float level switch according to claim 1, characterized in that: The pulling block (13) and the pressing block (15) fix the self-holding switch element (17) via a second hexagon socket screw (20); the mounting plate (12) and the first base (18) are spot welded; a top fixing block (14) is mounted on the mounting plate (12); and the mounting plate (12) and the top fixing block (14) are assembled via a first hexagon socket screw (19).

3. A multi-point output top-mounted float level switch according to claim 2, characterized in that: A connection terminal (16) is mounted on the mounting plate (12); the connection terminal (16) is mounted on the mounting plate (12) via a third hexagon socket screw (21).

4. A multi-point output top-mounted float level switch according to claim 1, characterized in that: A connecting wire (22) is installed on the self-holding switch element (17), the bottom end of the connecting wire (22) is connected to an aluminum tube (23), and a reed switch (24) is installed in the aluminum tube (23) and is sealed by filling with inert gas.

5. A multi-point output top-mounted float level switch according to claim 4, characterized in that: A magnetic steel (26) and a high-temperature resin glue (27) are respectively installed in the aluminum tube (23), and a second base (25) is installed at the bottom end of the aluminum tube (23) and is tightly matched with the aluminum tube (23) to form a packaging cavity.

6. A multi-point output top-mounted float level switch according to claim 1, characterized in that: A gasket (4) and a flange assembly (5) are respectively installed on the pressure pipe assembly (3), and the junction box assembly (1) is connected and sealed via the gasket (4) and the flange assembly (5).

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