CN213790743U

CN213790743U - Miniature diaphragm type differential pressure switch for airborne oxygen system

Info

Publication number: CN213790743U
Application number: CN202022733275.XU
Authority: CN
Inventors: 邬宗飞; 吕川
Original assignee: Chengdu Kangtuo Xingye Technology Co ltd
Current assignee: Chengdu Kangtuo Xingye Technology Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-07-27
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a small-size diaphragm formula differential pressure switch for airborne oxygen system, switch shell is equipped with the shell inner chamber, the diaphragm is arranged in the shell inner chamber and is kept apart the shell inner chamber for last inner chamber and lower inner chamber, the position that corresponds with last inner chamber and lower inner chamber is equipped with respectively in the switch shell and admits air and gathers the hole and give vent to anger and gather the hole, valve rod and contact conductor all arrange down the intracavity in and be the electric conductor, the upper end and the diaphragm contact of valve rod keep ascending stress through the spring, contact conductor is located the below of valve rod, valve rod and contact conductor are regarded as two links respectively and are connected with the alarm through the wire respectively. The utility model discloses an adopt simple structure, small, the quality is light, the diaphragm formula pressure differential switch that sensitivity is high to carry out real-time supervision and report to the police to the pressure differential between the inlet pressure of the filter body and the pressure of giving vent to anger, avoided leading to the poor problem of filter effect because of filtering the body jam, be particularly useful for needing the machine of minimizing volume and weight to carry the oxygen system.

Description

Miniature diaphragm type differential pressure switch for airborne oxygen system

Technical Field

The utility model relates to a differential pressure switch for monitoring pressure differential between two gas pressure especially relates to a miniature diaphragm formula differential pressure switch for airborne oxygen system.

Background

An airborne oxygen system is a system for preparing oxygen on an aircraft, air in the environment is used as a gas source, oxygen and nitrogen are prepared by an oxygen generator in an oxygen-nitrogen separation mode, and the air is multi-component mixed gas, so that oxygen, nitrogen, rare gas, water vapor, carbon dioxide, acetylene and hydrocarbon, and the air also contains solid impurities such as dust and the like, and the impurities can bring harm to the oxygen generator, such as blocking a gas pipeline, reducing the service life of a molecular sieve and the like, so that water removal and filtration are required before the air enters the molecular sieve.

The filter of the traditional airborne oxygen system generally does not use a differential pressure switch, and the problem of low filtering efficiency caused by the fact that the blockage of the filter cannot be timely removed exists, or the traditional differential pressure switch which adopts electronic structures such as an air pressure sensor or mechanical structures such as an elastic sheet has the problems of large volume, low sensitivity and poor sealing property, and is not suitable for the airborne oxygen system which needs to reduce the volume and the weight as much as possible.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a small-size diaphragm formula differential pressure switch for airborne oxygen system in order to solve above-mentioned problem.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

the utility model provides a small-size diaphragm formula differential pressure switch for airborne oxygen system for the monitoring airborne oxygen system's the filtration body admit air the side gas and give vent to anger the atmospheric pressure difference between the side gas, a small-size diaphragm formula differential pressure switch for airborne oxygen system includes switch shell, diaphragm, spring, valve rod and contact conductor, switch shell is equipped with the shell inner chamber, the diaphragm is arranged in the shell inner chamber and will the shell inner chamber is kept apart into upper chamber and lower inner chamber, switch shell in with upper chamber with the position that the inner chamber corresponds down is equipped with respectively and is used for with the gaseous introduction of the side of admitting air of filtration body the collection hole of admitting air of upper chamber with be used for with the gaseous introduction of the side of giving vent to anger of filtration body the collection hole of giving vent to anger of inner chamber down, the valve rod with contact conductor all arranges in the inner chamber down and be the electric conductor, vertical the upper end of valve rod with the diaphragm contact and through upward stress is kept to the spring, the contact conductor is located the below of shutter pole, the diaphragm is the back of downwarping the lower extreme of shutter pole can with the upper surface conductive contact of contact conductor, the shutter pole with the contact conductor is regarded as two link respectively and is connected with the alarm through the wire respectively. The filter body is inevitably blocked after being used for a period of time, the pressure difference between the air inlet pressure and the air outlet pressure of the filter body can be monitored in real time through the diaphragm type pressure difference switch, and an alarm signal is sent out when the pressure difference is overlarge, so that the filter body can be cleaned or replaced by a worker in time; the diaphragm type differential pressure switch adopts a mechanical pressure sensing structure, has high sensitivity and long service life, can realize the monitoring of differential pressure by utilizing the elasticity of the diaphragm and the auxiliary action of the spring, and has the advantages of simple structure, small volume and light weight; the diaphragm is a conventional diaphragm provided with a circular groove, the part of the diaphragm, which is positioned at the periphery of the circular groove, is used for connecting and mounting, the part, which is positioned in the circular groove, is used for forming an elastic structure, and can bend to one side when being subjected to external force, and can recover to the original shape after losing the external force, so that a better elastic effect can be realized by matching with the spring, the size of pressure required by the bending of the diaphragm can be conveniently adjusted, and the spring is in contact with the part, which is positioned in the circular groove, of the diaphragm; the alarm adopts a conventional auditory or/and visual alarm, the principle that the alarm is connected with the two wiring ends to realize the alarm is simple, namely the two wiring ends are connected in series at the power input end of the alarm.

Preferably, in order to facilitate installation of the diaphragm, the valve rod and the contact conductor and connection with an alarm, the diaphragm type differential pressure switch further comprises a non-metal ring, a spiral ring, a metal guide ring, a stud and a non-metal sleeve, the lower end of the switch shell is connected with the installation base body in a sealing manner to form a sealed lower inner cavity, the non-metal ring is composed of an integrally formed transverse plate and a circular ring which is vertical in the axial direction, a plurality of vertical through holes are formed in the transverse plate, the diaphragm is tightly pressed on the corresponding cavity wall of the inner cavity of the shell by the upper end of the circular ring of the non-metal ring, the spiral ring is in threaded connection with the corresponding cavity wall of the inner cavity of the shell and tightly presses the lower end of the circular ring of the non-metal ring, a vertical central through hole is formed in the central position of the transverse plate of the non-metal ring, the metal guide ring is installed in the central through hole, and the valve rod penetrates through the vertical through hole of the metal guide ring and can be in tight contact with the vertical sliding, the upper end and the lower extreme of spring respectively with the upper end of valve pole with the diaphragm contact of nonmetal ring or connection, the metal guide ring as with the link that the valve pole electrically conductive is connected, the double-screw bolt with the corresponding position threaded connection of installation base member, nonmetal cover suit is in on the double-screw bolt, the contact conductor suit is in outside the nonmetal cover.

The beneficial effects of the utility model reside in that:

the utility model adopts the diaphragm type pressure difference switch with simple structure, small volume, light weight and high sensitivity to monitor and alarm the pressure difference between the inlet pressure and the outlet pressure of the filter body in real time, thereby avoiding the problem of poor filtering effect caused by the blockage of the filter body, and being especially suitable for the airborne oxygen system which needs to reduce the volume and the weight as much as possible; the precompression quantity of the spring is changed by adjusting the spiral ring, so that the pressure difference required by pushing the diaphragm is changed, and the function of adjusting the alarm pressure difference value of the pressure difference switch can be realized.

Drawings

FIG. 1 is a partially cut-away perspective view of a water removal filter of an airborne oxygen system employing a miniature diaphragm differential pressure switch of the present invention;

FIG. 2 is a front cross-sectional view of a water removal filter of an airborne oxygen system employing a miniature diaphragm differential pressure switch of the present invention;

fig. 3 is a schematic structural diagram of a small diaphragm type differential pressure switch for an airborne oxygen system according to the present invention, which is also an enlarged view of "a" in fig. 1.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 3, the small-sized diaphragm type differential pressure switch 4 for airborne oxygen system of the present invention is used for monitoring the pressure difference between the gas at the gas inlet side and the gas at the gas outlet side of the filter body (actually, the filter element cartridge 14 in this example) of the airborne oxygen system, the small-sized diaphragm type differential pressure switch 4 for airborne oxygen system comprises a switch housing 41, a diaphragm 43, a spring 46, a shutter rod 44 and a contact conductor 50, the switch housing 41 is provided with a housing inner cavity, the diaphragm 43 is disposed in the housing inner cavity and separates the housing inner cavity into an upper inner cavity 42 and a lower inner cavity 49, the positions in the switch housing 41 corresponding to the upper inner cavity 42 and the lower inner cavity 49 are respectively provided with a gas inlet collecting hole 40 for introducing the gas at the gas inlet side of the filter body into the upper inner cavity 42 and a gas outlet collecting hole 51 for introducing the gas at the gas outlet side of the filter body into the lower inner cavity 49, the specific implementation manners of the gas inlet collecting hole 40 and the gas outlet hole 51 are determined according to the actual circumstances, as long as this function can be realized, the valve rod 44 and the contact conductor 50 are both arranged in the lower inner cavity 49 and are electric conductors, the upper end of the vertical valve rod 44 is in contact with the diaphragm 43 and keeps upward stress through the spring 46, the contact conductor 50 is located below the valve rod 44, the lower end of the valve rod 44 can be in conductive contact with the upper surface of the contact conductor 50 after the diaphragm 43 bends downwards, and the valve rod 44 and the contact conductor 50 are respectively used as two connecting ends and are respectively connected with the alarm 6 through wires. Preferably, the diaphragm type differential pressure switch 4 further comprises a non-metal ring 47, a spiral ring 48, a metal guide ring 45, a stud 53 and a non-metal sleeve 52, the lower end of the switch housing 41 is hermetically connected with a mounting base (in this example, the outer wall of the connecting mounting part 5 on the air outlet pipe 9 of the water removal filter of the airborne oxygen system, or the outer wall of the housing of the water removal filter of the airborne oxygen system) to form a sealed lower inner cavity 49, the non-metal ring 47 is composed of an integrally formed horizontal plate and an axially vertical circular ring, and a plurality of vertical through holes are formed in the horizontal plate, the diaphragm 43 is pressed against the corresponding cavity wall of the housing inner cavity by the upper end of the circular ring of the non-metal ring 47, the spiral ring 48 is in threaded connection with the corresponding cavity wall of the housing inner cavity and presses the lower end of the circular ring of the non-metal ring 47 upwards, the center position of the horizontal plate of the non-metal ring 47 is provided with a vertical center through hole, and the metal guide ring 45 is installed in the center through hole, the valve rod 44 penetrates through a vertical through hole of the metal guide ring 45 and can be in close contact with and slide vertically, the upper end and the lower end of the spring 46 are respectively in contact with or connected with the upper end of the valve rod 44 and a transverse plate of the nonmetal ring 45, the metal guide ring 45 serves as a connecting end in conductive connection with the valve rod 44, the stud 53 is in threaded connection with the corresponding position of the installation base body, the nonmetal sleeve 52 is sleeved on the stud 53, and the contact conductor 50 is sleeved outside the nonmetal sleeve 52.

As shown in fig. 1 and 2, a preferred structure of the membrane type differential pressure switch 4 for the water removal filter of the airborne oxygen system is as follows:

the water removal filter comprises a shell formed by connecting an upper shell 3 and a lower shell 8, wherein an air inlet pipe 1 is arranged at the upper end of the upper shell 3, a water outlet hole 18 is arranged at the bottom of the lower shell 8, an air outlet pipe 9 is arranged on the outer wall of the upper shell 3, an integrally formed inverted L-shaped pipe 12 is arranged in the upper shell 3, a tooth piece mounting seat 11 is arranged on the outer wall of the lower part of the inverted L-shaped pipe 12 through self internal threads, the upper end of a spiral tooth piece 13 is arranged on the outer wall of the tooth piece mounting seat 11 through self internal threads and is used for filtering gas, a vertical filter body is positioned at the central position in the shell, the spiral tooth piece 13 is arranged on the outer wall of the middle upper part of the filter body in a surrounding manner, a gap is formed between the outer wall of the spiral tooth piece 13 and the inner wall of the shell so as to facilitate the centrifugal separation of water along the inner wall of the shell, a filtering air inlet is arranged at the lower part of the filter body and is positioned above the water outlet hole 18, the upper part of the filtering body is provided with a filtering air outlet which is communicated with an air outlet pipe 9; the filter body comprises a filter element seat 15 and a filter element cylinder 14 arranged on the filter element seat 15; the bottom inner wall 17 of the lower shell 8 is conical and the water outlet hole 18 is positioned in the center of the cone; the outlet pipe 9 (or the upper case 3) is provided with a connection mounting portion 5, and the connection mounting portion 5 serves as the mounting base. Also shown in fig. 1 is air supply collection assembly 2, and also in fig. 2 is a gap 16 between the outer wall of cartridge seat 15 and the inner wall of lower housing 8, gap 16 being used for centrifugally separating water to leave along the inner wall of lower housing 8 to outlet aperture 18, these being of conventional adaptive construction.

The working principle of the diaphragm type differential pressure switch 4 and the water removal filter of the present invention will be described in detail with reference to fig. 1-3 below:

when the device works, compressed air for oxygen generation enters the upper shell 3 from the air inlet pipe 1, rapidly impacts the spiral tooth piece 13 from top to bottom through the air channel 10 to form a rotational flow, water drops in the air generate centrifugal motion, the water drops are separated from the air and attached to the inner wall of the upper shell 3, a large amount of accumulated water drops flow down along the inner wall of the upper shell 3 and the inner wall of the lower shell 8 under the action of gravity, are converged at the inner wall 17 at the conical bottom and are discharged out of the shell through the water outlet hole 18; meanwhile, in the process, the air flow can also wash water drops attached to the inner wall of the shell, so that the water drops quickly flow downwards and are discharged out of the shell; the air with most of water removed enters the filter element cylinder 14 from bottom to top, dust particles are blocked by the filter element in the filter element cylinder 14, and the filtered air is discharged through the inverted L-shaped pipe 12 and the through hole 7 of the air outlet pipe 9 and is sent to the oxygen generator.

A large amount of impurity particles can be attached to the filter element cylinder 14 after the filter element cylinder is used for a period of time, a part of small holes on the surface of the filter element cylinder 14 are blocked, the dust filtering effect is reduced, the filter element cylinder 14 needs to be cleaned or replaced, the diaphragm type differential pressure switch 4 is used for monitoring whether the filter element cylinder 14 is blocked in real time, and the working principle is as follows: air on the air inlet side of the filter element cylinder 14 enters an upper inner cavity 42 in the inner cavity of the shell through an air inlet collecting hole 40, air on the air outlet side of the filter element cylinder 14 enters a lower inner cavity 49 in the inner cavity of the shell through an air outlet collecting hole 51, if the filter element cylinder 14 is not blocked, the air pressure in the upper inner cavity 42 is basically equal to the air pressure in the lower inner cavity 49, the diaphragm 43 cannot be bent, the valve rod 44 cannot be contacted with the contact conductor 50, and the alarm 6 is in a disconnected state and cannot give an alarm; when the filter element cylinder 14 is blocked to a certain degree, the air on the air outlet side of the filter element cylinder 14 is reduced, the air pressure in the upper inner cavity 42 is obviously greater than the air pressure in the lower inner cavity 49, the diaphragm 43 can overcome the elasticity of the diaphragm and the elasticity of the spring 46 and bend downwards until the valve rod 44 is contacted with the contact conductor 50, the alarm 6 is in a connection state and sends out an alarm signal, and at the moment, a worker timely knows the problem of the blockage of the filter element cylinder 14 and solves the problem in a cleaning or replacing mode; after the blockage problem is removed, the air pressure in the upper inner cavity 42 and the air pressure in the lower inner cavity 49 are balanced again, the valve rod 44 rebounds upwards under the elasticity of the diaphragm 43 and the elasticity of the spring 46 to return to the normal working state.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.

Claims

1. A miniature diaphragm type pressure difference switch for an airborne oxygen system is used for monitoring the pressure difference between gas on the gas inlet side and gas on the gas outlet side of a filter body of the airborne oxygen system, and is characterized in that: the small-sized diaphragm type pressure difference switch for the airborne oxygen system comprises a switch shell, a diaphragm, a spring, a valve rod and a contact conductor, wherein the switch shell is provided with a shell inner cavity, the diaphragm is arranged in the shell inner cavity and isolates the shell inner cavity into an upper inner cavity and a lower inner cavity, positions in the switch shell corresponding to the upper inner cavity and the lower inner cavity are respectively provided with an air inlet side gas inlet collecting hole for introducing the filter body into the upper inner cavity and an air outlet side gas outlet collecting hole for introducing the filter body into the lower inner cavity, the valve rod and the contact conductor are arranged in the lower inner cavity and are electric conductors, the upper end of the valve rod is vertical, the upper end of the valve rod is in contact with the diaphragm, upward stress is kept through the spring, the contact conductor is positioned below the valve rod, and the lower end of the valve rod can be in conductive contact with the upper surface of the contact conductor after the diaphragm bends downwards, the valve rod and the contact conductor are respectively used as two connecting ends and are respectively connected with the alarm through leads.

2. The miniature diaphragm pressure differential switch for an on-board oxygen system of claim 1, wherein: the diaphragm type pressure difference switch also comprises a non-metal ring, a spiral ring, a metal guide ring, a stud and a non-metal sleeve, wherein the lower end of the switch shell is hermetically connected with the installation base body to form a sealed lower inner cavity, the non-metal ring is composed of an integrally formed transverse plate and a circular ring which is vertical in the axial direction, a plurality of vertical through holes are formed in the transverse plate, the diaphragm is tightly pressed on a corresponding cavity wall of the inner cavity of the shell by the upper end of the circular ring of the non-metal ring, the spiral ring is in threaded connection with the corresponding cavity wall of the inner cavity of the shell and upwards tightly presses the lower end of the circular ring of the non-metal ring, a vertical central through hole is formed in the central position of the transverse plate of the non-metal ring, the metal guide ring is installed in the central through hole, the valve rod penetrates through the vertical through hole of the metal guide ring and can be in tight contact with the vertical sliding, and the upper end and the lower end of the spring are respectively in contact with or connected with the upper end of the valve rod and the transverse plate of the non-metal ring, the metal guide ring is used as a connecting end electrically connected with the valve rod, the stud is in threaded connection with the corresponding position of the mounting base body, the non-metal sleeve is sleeved on the stud, and the contact conductor is sleeved outside the non-metal sleeve.