Liquid level switch

Abstract

The utility model discloses a liquid level switch, which comprises a liquid level switch main body and a liquid level switch main body fixing structure, the liquid level switch main body comprises a non-metal jacket and a metal measuring rod which are assembled in a sleeving manner, a junction box is arranged on the liquid level switch main body, and a wiring insulating plate is arranged in the junction box. A metal measuring rod lead-out wire binding post and a stuffing box sleeve lead-out wire binding post are arranged on the wiring insulating plate; the liquid level switch body fixing structure comprises a packing gland and a packing box sleeve, the packing gland is fixedly connected with the packing box sleeve through a packing gland bolt, and the liquid level switch body penetrates through the packing gland and the packing box sleeve in a sealed and sliding mode. And a packing layer is arranged between the inner cavity wall of the packing box sleeve and the outer side wall of the liquid level switch main body. According to the liquid level switch, the application requirements of complex working conditions are met, and meanwhile the convenience and the sealing performance of position adjustment of the liquid level switch are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid level monitoring, and in particular relates to a liquid level switch. Background Art

[0002] Common liquid level monitoring devices on the market include radar level gauges, ultrasonic level gauges, differential pressure level gauges, float level gauges, magnetic flap level gauges, and X-ray level gauges. These level gauges usually lack corresponding protective structures at their detection ends, so they are only suitable for working conditions with relatively good measurement environments. When used in complex environments such as corrosion, they will be subject to a certain degree of corrosion.

[0003] To overcome these drawbacks, Chinese patent application number 202022364778.4 discloses a corrosion-resistant liquid level switch. This design employs a protective housing to protect the liquid level switch from corrosion, adapting to applications in corrosive environments. Furthermore, a lifting frame allows the liquid level switch to be positioned differently. However, the lifting and adjusting process is relatively complex, and the seal between the liquid level switch and the liquid container is not considered during the adjustment process. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a liquid level switch so as to adapt to the application requirements of complex working conditions while improving the convenience of position adjustment and sealing of the liquid level switch.

[0005] The utility model solves the above problems through the following technical means:

[0006] A liquid level switch includes a liquid level switch body and a liquid level switch body fixing structure, the liquid level switch body includes a non-metallic outer shell and a metal measuring rod that are assembled in a sleeve manner, a junction box is provided on the liquid level switch body, a wiring insulation plate is provided in the junction box, and a metal measuring rod lead-out wire terminal and a stuffing box sleeve lead-out wire terminal are provided on the wiring insulation plate; the liquid level switch body fixing structure includes a stuffing gland and a stuffing box sleeve, the stuffing gland is fixedly connected to the stuffing box sleeve by a stuffing gland bolt, the liquid level switch body slides sealingly through the stuffing gland and the stuffing box sleeve, and a stuffing layer is provided between the inner cavity wall of the stuffing box sleeve and the outer side wall of the liquid level switch body.

[0007] Furthermore, the metal measuring rod is connected to a metal measuring rod lead-out wire, and the metal measuring rod lead-out wire is connected to a metal measuring rod lead-out wire terminal.

[0008] Furthermore, the stuffing box sleeve is connected to a stuffing box sleeve lead-out wire, and the stuffing box sleeve lead-out wire is connected to a stuffing box sleeve lead-out wire terminal.

[0009] Furthermore, the junction box is provided with a cable gland for leading out the wires.

[0010] Furthermore, the junction box is arranged on the top of the liquid level switch body.

[0011] Furthermore, the wiring insulation plate is arranged at the bottom of the junction box.

[0012] Beneficial effects of the utility model:

[0013] 1. The liquid level switch of the present application, on the one hand, adopts a metal measuring rod as a detection member, and is protected by a non-metallic outer shell, which is conducive to improving the scope of application under complex working conditions; on the other hand, the position of the liquid level switch body can be raised and lowered by only pulling, and when the liquid level switch body is raised and lowered, the stuffing gland, stuffing box sleeve and stuffing layer constitute a reliable sealing system, thereby effectively improving the convenience and sealing of the liquid level switch position adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

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

[0016] Figure 1 A schematic cross-sectional view of a liquid level switch provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the structure of a liquid level switch provided in an embodiment of the present application installed on the low section of the outlet pipe of a sulfuric acid high-temperature superheater economizer;

[0018] Figure 3 A schematic diagram of the structure of a liquid level switch provided in an embodiment of the present application installed on the lower section of the outlet pipe of the demister of the first sulfuric acid absorption tower;

[0019] Among them, the reference numerals in the figures are:

[0020] 1. Metal measuring rod; 2. Non-metallic outer casing; 3. Stuffing gland bolt; 4. Stuffing gland; 5. Stuffing layer; 6. Stuffing box bushing; 7. Junction box; 8. Cable gland; 9. Wiring insulation plate; 10. Lead wire from metal measuring rod; 11. Terminal for lead wire from metal measuring rod; 12. Terminal for lead wire from stuffing box bushing; 13. Lead wire from stuffing box bushing; 14. Metal container; 15. Medium liquid level. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 on this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0025] like Figures 1 to 3 As shown, the present invention discloses a liquid level switch, including a liquid level switch body and a liquid level switch body fixing structure, the liquid level switch body includes a non-metallic outer sleeve 2 and a metal measuring rod 1 that are sleeved together, a junction box 7 is provided on the liquid level switch body, a junction box is provided inside a junction insulating plate 9, a metal measuring rod lead-out wire terminal 11 and a stuffing box sleeve lead-out wire terminal 12 are provided on the junction insulating plate; the liquid level switch body fixing structure includes a stuffing gland 4 and a stuffing box sleeve 6, the stuffing gland is fixedly connected to the stuffing box sleeve by a stuffing gland bolt 3, the liquid level switch body seal slides through the stuffing gland and the stuffing box sleeve, and a stuffing layer 5 is provided between the inner cavity wall of the stuffing box sleeve and the outer wall of the liquid level switch body.

[0026] The metal measuring rod is connected to a metal measuring rod lead wire 10, which is connected to a metal measuring rod lead wire terminal. The stuffing box sleeve is connected to a stuffing box sleeve lead wire 13, which is connected to a stuffing box sleeve lead wire terminal.

[0027] The junction box is provided with a gland 8 for leading out the wires. The junction box is arranged on the top of the liquid level switch body. The wiring insulation plate is arranged on the bottom of the junction box.

[0028] The stuffing box sleeve 6 is installed on the metal container 14 of the measured device by welding. When the medium liquid level 15 rises and contacts the metal measuring rod 1, since the medium is conductive, the metal measuring rod lead-out wire terminal 11 and the stuffing box sleeve lead-out wire terminal 12 form an electrical conduction loop, and then connect to the external signal acquisition device through the terminal, thus forming a liquid level monitoring feedback.

[0029] In this embodiment, the non-metallic outer shell 2 and the metal measuring rod 1 are tightly sealed. When the non-metallic outer shell 2 is ceramic, polytetrafluoroethylene sealing material is filled between the non-metallic outer shell 2 and the metal measuring rod 1.

[0030] like Figure 2 As shown, the liquid level switch is installed on the low section of the flue gas duct at the outlet of the high-temperature superheater economizer of a sulfuric acid plant, which is equivalent to the metal container 14. The long-term measurement environment is flue gas containing sulfur dioxide and sulfur trioxide, with a temperature of 445 degrees Celsius and a pressure of 30kPa. The non-metallic jacket 2 is made of corundum ceramic, which is resistant to high temperature and corrosion. When the economizer leaks, a sulfuric acid solution with a temperature exceeding 100 degrees and an uncertain concentration and strong corrosiveness will form at the bottom of the flue gas duct, containing sulfuric acid sludge. The rising liquid level will quickly trigger the liquid level switch to operate, and the operator can make a timely judgment and deal with it, avoiding the system from generating a large amount of high-temperature condensed acid due to delayed judgment, which will corrode equipment and pipelines for a long time, reduce the poisoning of the vanadium catalyst by water vapor, and reduce serious systemic damage to the device.

[0031] like Figure 3 As shown, the level switch is installed at the lower end of the flue gas duct at the outlet of the first absorption tower of the sulfuric acid plant. The long-term measurement environment is flue gas containing sulfur dioxide and sulfur trioxide, with a flue gas temperature of 75°C and a pressure of 15kPa. The non-metallic outer casing 2 is made of F4 or F46 PTFE material, and the end of the metal measuring rod 1 is extended. When the sulfuric acid solution level at the bottom of the flue gas duct reaches a certain height, the level switch is triggered, prompting the operator to perform acid drainage. The level switch is installed at an angle.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A liquid level switch, characterized in that: It includes a liquid level switch body and a liquid level switch body fixing structure. The liquid level switch body includes a non-metallic outer shell and a metal measuring rod that are sleeved and assembled. A junction box is provided on the liquid level switch body. A junction insulating plate is provided in the junction box. The metal measuring rod lead-out wire terminal and the stuffing box sleeve lead-out wire terminal are provided on the junction insulating plate. The liquid level switch body fixing structure includes a stuffing gland and a stuffing box sleeve. The stuffing gland is fixedly connected to the stuffing box sleeve by a stuffing gland bolt. The liquid level switch body slides sealingly through the stuffing gland and the stuffing box sleeve. A stuffing layer is provided between the inner cavity wall of the stuffing box sleeve and the outer side wall of the liquid level switch body.

2. The liquid level switch according to claim 1, characterized in that: The metal measuring rod is connected to a metal measuring rod lead-out wire, and the metal measuring rod lead-out wire is connected to a metal measuring rod lead-out wire terminal.

3. The liquid level switch according to claim 2, characterized in that: The stuffing box sleeve is connected to a stuffing box sleeve lead-out wire, and the stuffing box sleeve lead-out wire is connected to a stuffing box sleeve lead-out wire terminal.

4. The liquid level switch according to claim 3, characterized in that: The junction box is provided with a cable gland for leading out wires.

5. The liquid level switch according to claim 4, characterized in that: The junction box is arranged on the top of the liquid level switch body.

6. The liquid level switch according to claim 5, characterized in that: The wiring insulation plate is arranged at the bottom of the wiring box.

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