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CN-117379853-B - Filter differential pressure indicator with temperature locking function

CN117379853BCN 117379853 BCN117379853 BCN 117379853BCN-117379853-B

Abstract

The utility model provides a filter differential pressure indicator with temperature locking function, including the casing, pass through fixed baffle and lower piston in the casing, divide into the cavity of instructing, high pressure chamber and low pressure chamber, be equipped with elastic element in the low pressure chamber, lower piston and low pressure chamber sliding seal, the up end central authorities of lower piston are fixed with first projection, the face central authorities of fixed baffle upwards bulge and form protruding lid, be equipped with the first sliding sleeve of slip cover locating protruding lid outer wall in the instruction chamber, first sliding sleeve is embedded to have ring magnet steel, be equipped with the indicator above the first sliding sleeve, upper portion and the lower part in the high pressure chamber are equipped with fly leaf and temperature locking sheetmetal respectively, the upper face central authorities of fly leaf are fixed with the second projection that the adaptation was inserted in protruding lid recess, the second projection is embedded to have post magnet steel, the lower face of fly leaf corresponds with the upper end of first projection and is connected, this differential pressure indicator can directly feel the locking, accuracy and flexibility of differential pressure indicator are improved.

Inventors

  • JIA XIAONAN
  • TIAN WEI
  • CHEN WEI
  • PENG HONGJIE

Assignees

  • 新乡航空工业(集团)有限公司

Dates

Publication Date
20260512
Application Date
20231027

Claims (9)

  1. 1. A filter differential pressure indicator with a temperature locking function is characterized by comprising a shell with a vertical inner cavity, wherein the inner cavity is divided into an indication cavity (2) by a fixed partition plate (3) and a lower piston (15) which are arranged vertically and correspondingly, a high-pressure cavity (9) and a low-pressure cavity (18) which are respectively communicated with a high-pressure side and a low-pressure side of a filter element correspondingly, an elastic element (19) which is abutted against the lower end of the lower piston (15) to enable the lower piston to have an upward trend is arranged in the low-pressure cavity (18), the outer wall of the lower piston (15) and the cavity wall of the low-pressure cavity (18) are sealed in a sliding mode, a first convex column (13) is fixed in the center of the upper end face of the lower piston (15), the center of the face of the fixed partition plate (3) is upwards protruded to form a convex cover part (301) with a groove, a first sliding sleeve (4) which is sleeved on the outer wall of the convex cover part (301) is arranged in the indication cavity (2), a circular magnetic steel (5) is embedded in the first sliding sleeve (4), an elastic element (19) which is abutted against the lower end of the lower piston (15) to enable the upper end of the lower piston to have an upward trend, a second convex plate (8) is arranged above the first sliding sleeve (4) and a movable plate (8) which can be matched with the upper metal plate (8) and a second convex plate (8) which is provided with a movable plate (8), the second convex column (6) is embedded with column magnetic steel (7) which can be inserted into the annular magnetic steel (5) to be in an attractive state and is separated from the annular magnetic steel (5) to be in a repulsive state, the lower plate surface of the movable plate (8) is correspondingly connected with the upper end of the first convex column (13), the first convex column (13) is embedded with a ferromagnetic body (14) which can be magnetically attracted and connected with the column magnetic steel (7), the center of the lower plate surface of the movable plate (8) is fixedly provided with a second sliding sleeve (10) which is sleeved on the outer wall of the first convex column (13) in a sliding manner, the outer diameter of the second sliding sleeve (10) is smaller than the outer diameter of the lower piston (15), and the temperature locking metal sheet (16) can be in a low-temperature locking state to be in a collision blocking state to move the movable plate (8) downwards, and in a high Wen Jiesuo state, the movable plate (8) is enabled to move downwards.
  2. 2. The filter differential pressure indicator with the temperature locking function according to claim 1, wherein the surface of the movable plate (8) is provided with an air hole (11) communicated with the inner cavity of the second sliding sleeve (10) and the high-pressure cavity (9).
  3. 3. The filter differential pressure indicator with temperature locking function according to claim 1, wherein the shell comprises an upper sleeve body (22) and a lower sleeve body (23) which is connected with a lower port of the upper sleeve body (22) in a threaded mode, the fixed partition plate (3) is fixed in the upper sleeve body (22), the lower piston (15) is in sliding fit with the middle portion in the lower sleeve body (23), and a plug (20) is connected with the lower port of the lower sleeve body (23) in a threaded mode.
  4. 4. The filter differential pressure indicator with temperature locking function according to claim 3, wherein limiting grooves are formed in the center of the lower end face of the lower piston (15) and the center of the upper end face of the plug (20), the elastic element (19) is a spring, two ends of the spring are respectively clamped in the two limiting grooves, and a low-pressure through hole (21) is formed in the bottom of the limiting groove of the plug (20).
  5. 5. The filter differential pressure indicator with temperature locking function according to claim 3, wherein the upper caliber of the inner cavity of the lower sleeve body (23) is expanded outwards to form a step surface with the middle part, the temperature locking metal sheet (16) is arranged on the step surface, and the upper cavity wall of the inner cavity of the lower sleeve body (23) is provided with a high-pressure through hole (12).
  6. 6. The filter differential pressure indicator with temperature locking function according to claim 1, wherein the outer wall of the lower piston (15) is provided with a sealing ring groove with a sealing ring (17).
  7. 7. The filter differential pressure indicator with temperature locking function according to claim 1, wherein the temperature locking metal sheet (16) is provided in a bimetal sheet structure or a memory alloy sheet structure which can be expanded by heating.
  8. 8. The filter differential pressure indicator with temperature locking function according to claim 1, wherein the temperature locking metal sheet (16) has a certain locking temperature of 0 ℃ or less and a certain unlocking temperature of 30 ℃ or more.
  9. 9. The filter differential pressure indicator with temperature locking function according to claim 1, wherein the alarm differential pressure value of the indicator (1) popping alarm is 0.5+/-0.07 MPa.

Description

Filter differential pressure indicator with temperature locking function Technical Field The invention relates to the technical field of filters, in particular to a filter differential pressure indicator with a temperature locking function. Background As is known, the filter is a main component for controlling the pollution of the fluid, and part of the system requires the filter product to have the functions of monitoring the blocking state of the filter element and sending out an alarm signal when the filter element is blocked, so that a differential pressure indicator is also assembled on the corresponding filter product to realize the alarm of blocking the filter element; the filter element alarm mode comprises mechanical alarm, electric signal alarm, electromechanical integrated alarm and the like, and the differential pressure indicator generally needs to prescribe a locking temperature because the viscosity of oil is higher under the low-temperature starting condition and the flow resistance of the filter element is higher at the moment, so that false alarm is easy to occur; Most of the existing locking devices have complex structure control, are positioned outside the differential pressure indicator, namely in a region completely isolated from a working medium, cannot directly sense the oil temperature, and only are subjected to the effects of ambient air temperature and metal heat conduction to generate locking or unlocking actions. Disclosure of Invention In order to overcome the defects in the background technology and solve the problems in the prior art, the invention discloses a filter differential pressure indicator with a temperature locking function, which can directly sense the oil temperature for locking and improve the accuracy and the flexibility of the differential pressure indicator. In order to achieve the aim of the invention, the invention adopts the following technical scheme: A filter differential pressure indicator with a temperature locking function comprises a shell with a vertical inner cavity, wherein the inner cavity is divided into an indication cavity by a fixed partition plate and a lower piston which are arranged up and down correspondingly, and a high-pressure cavity and a low-pressure cavity which are respectively communicated with a high-pressure side and a low-pressure side of a filter element correspondingly, an elastic element which is used for abutting against the lower end of the lower piston to enable the lower end of the lower piston to have an upward trend is arranged in the low-pressure cavity, the outer wall of the lower piston and the cavity wall of the low-pressure cavity are sealed in a sliding mode, a first convex column is fixed in the center of the upper end face of the lower piston, the center of the surface of the fixed partition plate is raised upwards to form a convex cover part with a groove, a first sliding sleeve is arranged in the indication cavity in a sliding mode and sleeved on the outer wall of the convex cover part, annular magnetic steel is embedded in the first sliding sleeve, an indication part capable of ejecting an alarm upwards is arranged above the first sliding sleeve, a movable plate and a temperature locking metal sheet are respectively arranged on the upper part and the lower part of the high-pressure cavity, a second convex column which is matched and is arranged in a groove of the convex cover part, a second convex column is fixedly arranged in the middle of the upper surface of the movable plate, the second convex column is matched and can be inserted into the convex column, and can be separated from the movable plate in a corresponding state with the high-temperature locking magnetic steel, and a high-temperature locking state, and a temperature locking state can be kept down by the movable magnetic steel in a high-phase, and a high-phase magnetic steel can be kept in a high-phase state and a high phase magnetic steel and a phase-pressure phase-locking state and a phase-locking state can be separated. Further, the first convex column is embedded with a ferromagnetic body which can be magnetically attracted and connected with the column magnetic steel, a second sliding sleeve which is sleeved on the outer wall of the first convex column in a sliding manner is fixed in the center of the lower plate surface of the movable plate, and the outer diameter of the second sliding sleeve is smaller than that of the lower piston. Further, the movable plate face is provided with ventilation holes communicated with the inner cavity of the second sliding sleeve and the high-pressure cavity. Further, the casing contains the cover body and the lower cover body of threaded connection in the lower port of the cover body, fixed baffle is fixed in the cover body, lower piston sliding fit is in the internal middle part of cover down, the lower port threaded connection of the cover body has the end cap down. Further, the lower end face center of t