Differential pressure alarm locking mechanical indicator

Abstract

The utility model relates to the technical field of oil filter overpressure alarm, and discloses a differential pressure alarm locking mechanical indicator which comprises a shell used for being installed on an oil filter, a transparent cover body arranged at the top of the shell and an indicating rod located in the transparent cover body, an upper cavity and a lower cavity are formed in the shell, and the indicating rod is located in the upper cavity of the shell. And a piston is arranged in the lower cavity of the shell and is arranged in the middle of the lower cavity of the shell. When the oil filter element is blocked and alarms and prompts to replace the filter element, the mechanical indicator is in an alarm state and cannot be reset, and the indicator can be reset until the filter element is manually replaced, so that the alarm signal can be effectively prevented from being relieved by manual operation, and operation and maintenance personnel can timely master the working state of the oil filter and timely replace the filter element; the bypass valve is prevented from being opened and polluting a downstream system due to the fact that the filter element is not replaced in time, and safety accidents caused by pollution of an aircraft oil system are effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of oil filter overpressure alarm technology, and in particular to a differential pressure alarm locking mechanical indicator. Background Technology

[0002] As the oil filter element is used for a longer period, the pressure difference across the filter element will increase until the element becomes clogged. If maintenance personnel do not replace the filter element promptly after it becomes clogged, the pressure difference will continue to increase until the bypass valve inside the oil filter opens. Unpurified oil will then flow directly into the downstream oil system through the bypass valve, contaminating the downstream system's oil and potentially causing malfunctions in downstream components, resulting in safety hazards.

[0003] Currently used mechanical alarm indicators lack a locking function. This means that when the filter element becomes clogged, the indicator cap pops out, triggering an alarm. If maintenance personnel accidentally reset the indicator cap, it can be easily reset due to the lack of a locking mechanism. Therefore, this patent designs a differential pressure alarm locking mechanical indicator. When the mechanical indicator alarms, the indicator cap remains in the alarm state. Even if manually operated, the indicator cap will not reset. Only after removing the lower housing of the filter and the filter element assembly, and replacing the filter element, can the indicator cap be reset. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a differential pressure alarm locking mechanical indicator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A differential pressure alarm locking mechanical indicator includes a housing for mounting on an oil filter, a transparent cover on the top of the housing, and an indicator rod located inside the transparent cover. The housing has upper and lower cavities, with the indicator rod located in the upper cavity. The lower cavity of the housing includes:

[0007] A piston is located in the middle of the lower cavity of the housing, dividing the upper and lower spaces of the lower cavity of the housing into a high-pressure chamber and a low-pressure chamber. A first magnet is installed on both the upper and lower sides of the piston.

[0008] The magnet seat is movably disposed at the bottom of the cavity below the housing for contacting the upper end cover of the oil filter, and it is connected to the first magnet below the piston through the first return spring.

[0009] The bottom of the indicator rod is provided with a second magnet, which is adapted to the first magnet above the piston. The indicator rod is connected to the bottom of the upper cavity of the housing through a second return spring.

[0010] Preferably, the transparent cover is made of transparent glass and is positioned inside the upper cover, which is screwed to the top of the cover via threads.

[0011] Preferably, a first sealing ring and a second sealing ring are respectively provided on the upper and lower sides of the outer side of the housing, and the two sealing rings are used to isolate the high-pressure chamber and the low-pressure chamber.

[0012] Preferably, a clamping plate is provided on the upper part of the inside of the housing, located on both sides of the indicator rod, and protrusions are provided on both sides of the indicator rod for abutting against the clamping plate.

[0013] Preferably, a support and a rod that moves through the support are installed in the lower part of the cavity below the housing. The top of the rod is connected to the bottom of the magnet base, and a third return spring is provided between the magnet base and the support.

[0014] Preferably, the bottom of the cavity below the housing is provided with a plug, a fourth sealing ring, and a retaining ring for the hole, arranged sequentially from the inside to the outside.

[0015] Preferably, the clamping plate is made of a flexible material that is easy to compress and restore its shape.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention addresses the issue of a mechanical indicator remaining in an alarm state and unable to be reset until the filter element is manually replaced. This effectively prevents manual intervention from clearing the alarm signal and prompts operators to replace the filter element promptly. This allows operators and maintenance personnel to monitor the oil filter's operating status and replace the filter element in a timely manner, preventing the bypass valve from opening and contaminating downstream systems due to delayed filter replacement. This effectively avoids safety accidents caused by contamination of the aircraft's oil system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a differential pressure alarm locking mechanical indicator proposed in this utility model.

[0019] In the diagram: 1. Transparent cover; 2. Indicator rod; 3. Pressing plate; 4. Top cover; 5. Second magnet; 6. Second return spring; 7. First sealing ring; 8. Third sealing ring; 9. Second sealing ring; 10. Magnet seat; 11. Third return spring; 12. Plug cap; 13. Fourth sealing ring; 14. Hole retaining ring; 15. First return spring; 16. Piston; 17. Housing; 18. First magnet; 19. Support; 20. Support rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1 A differential pressure alarm locking mechanical indicator includes a housing 17 for mounting on an oil filter, a transparent cover 1 disposed on the top of the housing 17, and an indicator rod 2 located inside the transparent cover 1. The housing 17 has upper and lower cavities, with the indicator rod 2 located in the upper cavity of the housing 17. The lower cavity of the housing 17 includes:

[0022] Piston 16 is located in the middle of the lower cavity of housing 17, dividing the upper and lower space of the lower cavity of housing 17 into a high-pressure cavity and a low-pressure cavity. First magnets 18 are installed on both the upper and lower sides of piston 16, and a third sealing ring 8 is provided on the outside of piston 16 to fit the lower cavity of housing 17.

[0023] The magnet seat 10 is movably disposed at the bottom of the cavity below the housing 17 for contacting the upper end cover of the oil filter, and is connected to the first magnet below the piston 16 through the first return spring 15.

[0024] The bottom of the indicator rod 2 is provided with a second magnet 5, and the second magnet 5 is adapted to the first magnet 18 above the piston 16. The indicator rod 2 is connected to the bottom of the cavity above the housing 17 through the second return spring 6.

[0025] In this embodiment, the transparent cover 1 is made of transparent glass and is positioned within the upper cover 4. The upper cover 4 is screwed to the top of the cover via threads.

[0026] In this embodiment, a first sealing ring 7 and a second sealing ring 9 are respectively provided on the upper and lower sides of the outer side of the housing 17, and the first sealing ring 7 and the second sealing ring 9 are used to isolate the high-pressure chamber and the low-pressure chamber.

[0027] In this embodiment, a clamping plate 3 is provided on the upper part of the inside of the housing 17, located on both sides of the indicator rod 2, and protrusions are provided on both sides of the indicator rod 2 for abutting against the clamping plate 3.

[0028] In this embodiment, a support 19 and a rod 20 that moves through the support 19 are installed in the lower part of the cavity below the housing 17. The top of the rod 20 is connected to the bottom of the magnet seat 10, and a third return spring 11 is provided between the magnet seat 10 and the support.

[0029] In this embodiment, the bottom of the cavity below the housing 17 is provided with a plug 12, a fourth sealing ring 13 and a hole retaining ring 14 in sequence from the inside to the outside.

[0030] In this embodiment, the clamping plate 3 is made of a flexible material that is easy to compress and restore its shape.

[0031] When this device is in use, the alarm locking mechanical indicator is installed on the upper end cover of the oil filter. The annular magnet seat 10 is in direct contact with the upper end cover (i.e., support) of the filter element via the third return spring 11. The high-pressure chamber of the alarm locking mechanical indicator is connected to the oil inlet of the oil filter, and the low-pressure chamber is connected to the oil outlet of the oil filter. As the pressure difference between the inlet and outlet increases to the set value, it pushes the piston 16 and the third return spring 11 downward, causing the first magnet 18 on the upper part of the piston 16 to disengage from the second magnet 5 at the bottom of the indicator rod 2. Under the action of the elastic force of the second return spring 6, the indicator rod 2 pops out and emits a red alarm signal, indicating that the filter element is blocked. At the same time, the first magnet 18 on the lower part of the piston 16... Steel 18 moves downward against the first return spring 15 and attracts the annular magnet seat 10. At this time, the attraction force of the first magnet 18 is greater than the force of the first return spring 15. At this time, it cannot be reset by manually pressing the indicator rod 2. Only after removing the filter lower housing 17 and filter element assembly, the annular magnet seat 10 can be reset by the support rod 20 under the action of the third return spring 11. At this time, the first magnet 18 at the lower part of the piston 16 separates, and the piston 16 moves upward (reset) under the action of the first return spring 15. At this time, the first magnet 18 at the upper part of the piston 16 attracts the second magnet 5 of the alarm indicator rod 2. Only then can the alarm indicator rod 2 be reset.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A differential pressure alarm locking mechanical indicator, comprising a housing for mounting on an oil filter, a transparent cover disposed on the top of the housing, and an indicator rod located inside the transparent cover, wherein the housing has upper and lower cavities, and the indicator rod is located in the upper cavity of the housing, characterized in that: The cavity below the housing includes: A piston is located in the middle of the lower cavity of the housing, dividing the upper and lower spaces of the lower cavity of the housing into a high-pressure chamber and a low-pressure chamber. A first magnet is installed on both the upper and lower sides of the piston. The magnet seat is movably disposed at the bottom of the cavity below the housing for contacting the upper end cover of the oil filter, and it is connected to the first magnet below the piston through the first return spring. The bottom of the indicator rod is provided with a second magnet, which is adapted to the first magnet above the piston. The indicator rod is connected to the bottom of the upper cavity of the housing through a second return spring.

2. The differential pressure alarm locking mechanical indicator according to claim 1, characterized in that: The transparent cover is made of transparent glass and is positioned inside the upper cover. The upper cover is screwed to the top of the cover via threads.

3. The differential pressure alarm locking mechanical indicator according to claim 1, characterized in that: The upper and lower sides of the outer shell are respectively provided with a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are used to isolate the high-pressure chamber and the low-pressure chamber.

4. A differential pressure alarm locking mechanical indicator according to claim 2, characterized in that: The upper part of the housing is provided with clamping plates located on both sides of the indicator rod, and the two sides of the indicator rod are provided with protrusions for abutting against the clamping plates.

5. A differential pressure alarm locking mechanical indicator according to claim 1, characterized in that: A support and a rod that moves through the support are installed at the bottom of the cavity below the housing. The top of the rod is connected to the bottom of the magnet base, and a third return spring is provided between the magnet base and the support.

6. A differential pressure alarm locking mechanical indicator according to claim 5, characterized in that: The bottom of the cavity below the housing is provided with a plug, a fourth sealing ring, and a hole retaining ring in sequence from the inside to the outside.

7. A differential pressure alarm locking mechanical indicator according to claim 4, characterized in that: The clamping plate is made of a flexible material that is easy to compress and restore its shape.

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