CN213790744U - Water removal filter for airborne oxygen system - Google Patents

Abstract

The utility model discloses a dewatering filter for airborne oxygen system, the upper end of casing is equipped with the intake pipe, the bottom of casing is equipped with the apopore, be equipped with the outlet duct on the outer wall of casing, install spiral tooth piece and cross the filter body in the casing, vertical central point that crosses the filter body and be located the casing puts, spiral tooth piece is around installing on the well upper portion outer wall of crossing the filter body, be equipped with the clearance between the outer wall of spiral tooth piece and the inner wall of casing, the lower part of crossing the filter body is equipped with the filtration air inlet, the upper portion of crossing the filter body is equipped with and filters gas port and filtration gas port and outlet duct intercommunication. The utility model discloses a with dewatering device and filter equipment high integration on an equipment, have dewatering and filtering capability concurrently, make the air that gets into the oxygenerator satisfy dry and clear high-quality requirement, prolonged the life-span of airborne oxygenerator, show simultaneously and reduced whole oxygen system's volume and weight, reduced aircraft flight load and cost.

Description

Water removal filter for airborne oxygen system

Technical Field

The utility model relates to a filtration equipment that oxygen system used especially relates to a dewatering filter that is used 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.

In the traditional airborne oxygen system, the air is subjected to water removal and filtration by adopting independent equipment, so that the volume and the weight of the whole oxygen system are increased, and the flying load and the cost of an airplane are increased; some airborne oxygen systems only have one function of water removal and filtration, so that air entering the oxygen generator is difficult to meet high-quality requirements, damage can be caused to the oxygen generator, and the service life of the oxygen generator is shortened.

At present, the air filtration mode of traditional airborne oxygen system mainly has two kinds and each has the drawback, specifically as follows: one is wet filtration, namely solid particles in air are adhered through an oil film, and the method is easy to cause the saturation of the oil film on the surface and the failure in dust removal in an environment with more dust, so that the service life is short; the other is dry filtration, namely dust with the diameter smaller than the pore diameter in the air is blocked by the meshes of the fabric, but the blockage is easy to occur, so that the dust removal efficiency is reduced.

In addition, in order to know whether the filter of the airborne oxygen system is blocked in time, a pressure difference switch is generally adopted to compare and monitor the air pressure of the air inlet end and the air outlet end of the filter, and once the air pressure of the air inlet end is obviously greater than the air pressure of the air outlet end, the filter is judged to be blocked, and then the alarm on the pressure difference switch is used for giving an alarm in real time.

However, the conventional differential pressure switch generally adopts an electronic structure such as an air pressure sensor or a mechanical structure such as an elastic sheet, has the problems of large volume, low sensitivity and poor sealing property, and is not suitable for an airborne oxygen system needing to reduce the volume and the weight as much as possible.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a water removal filter for an airborne oxygen system that integrates water removal and filtration functions to solve the above problems.

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

the utility model provides a dewatering filter for airborne oxygen system, which comprises a housin, the upper end of casing is equipped with the intake pipe, the bottom of casing is equipped with the apopore, be equipped with the outlet duct on the outer wall of casing, install in the casing and be used for the spiral tooth piece of gaseous dewatering and be used for the filtering body for gas filtration, vertical filtering body is located central point in the casing puts, the spiral tooth piece around install in on the well upper portion outer wall of filtering body, the outer wall of spiral tooth piece with be equipped with the clearance between the inner wall of casing, filtering body's lower part is equipped with the filtration air inlet just the filtration air inlet is located the top of the apopore of casing, filtering body's upper portion is equipped with the filtration gas outlet just the filtration gas outlet with the outlet duct intercommunication.

In the structure, the spiral tooth sheet is a conventional part which is used for forming cyclone for gas so as to realize water-gas separation and achieve the aim of removing water; the filter body is used for filtering gas, various conventional filter bodies with different structures can be selected according to requirements, and meanwhile, the filter body has the function of further blocking and removing water from other residual water, so that a better water removing effect is realized; the utility model discloses a key is to combine dewatering device and filter equipment to realize dewatering and filtering capability simultaneously together, and utilizes gaseous downflow circumference separation dewatering and gaseous to collect the high-efficient integration that the overall arrangement of upflow filter realized two kinds of structures to the middle part, realizes the high integration degree purpose.

Preferably, the filter body comprises a filter element seat and a filter element cylinder arranged on the filter element seat, so as to facilitate the installation, cleaning and replacement of the filter body. The built-in filter element of the filter element cylinder can well filter impurities such as dust in the gas, has the advantages of large flow area and small gas flow resistance, and is convenient to clean and replace.

Preferably, in order to facilitate concentrated discharge of water separated from the gas and flowing down along the inner wall of the housing, the inner wall of the bottom of the housing is tapered, and the water outlet is located at the center of the taper. The aperture of this apopore is set for according to actual need, minimizes the aperture when guaranteeing to discharge in time to minimize gas loss.

Furthermore, in order to monitor the pressure difference between the inlet pressure and the outlet pressure of the filter body in real time and send out an alarm when the pressure difference is too large, a diaphragm type pressure difference switch for monitoring the pressure difference between the inlet pressure and the outlet pressure of the filter body is installed on the shell or the outlet pipe, the diaphragm type pressure difference switch comprises a switch shell, a diaphragm, a spring, a valve rod and a contact conductor, 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, the positions in the switch shell corresponding to the upper inner cavity and the lower inner cavity are respectively provided with an inlet collecting hole for introducing the inlet side gas of the filter body into the upper inner cavity and an outlet collecting hole for introducing the outlet side gas of the filter body into the lower inner cavity, the valve rod and the contact conductor are both arranged in the lower inner cavity and are electric conductors, the upper end of vertical valve pole with the diaphragm contact passes through the ascending stress of spring holding, the contact conductor is located the below of valve pole, the diaphragm is crooked back downwards the lower extreme of valve pole can with the upper surface conductive contact of contact conductor, the valve pole with the contact conductor is regarded as two links 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 hermetically connected with the outer wall of the shell or the outer wall of the outlet pipe 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 upwardly 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, and the metal guide ring is installed in the central through hole, the valve rod passes the vertical through-hole of metal guide ring and can the vertical slip of in close contact with, the upper end and the lower extreme of spring respectively with the upper end of valve rod with the diaphragm contact or the connection of nonmetal ring, the metal guide ring as with the link that valve rod conductive connection is connected, the double-screw bolt with the outer wall of casing or the outer wall of outlet duct corresponds position threaded connection, nonmetal suit is in on the double-screw bolt, the contact conductor suit is in outside the nonmetal cover.

Preferably, for convenience of processing and assembly, the housing comprises an upper housing and a lower housing which are connected with each other, an integrally formed inverted L-shaped pipe is arranged in the upper housing, the tooth piece mounting seat is mounted on the outer wall of the lower part of the inverted L-shaped pipe through self internal threads, and the upper end of the spiral tooth piece is mounted on the outer wall of the tooth piece mounting seat through self internal threads.

The beneficial effects of the utility model reside in that:

the utility model integrates the water removal device and the filtering device on one device, and has the functions of water removal and filtering, so that the air entering the oxygen generator meets the high quality requirements of drying and cleaning, the service life of the onboard oxygen generator is prolonged, the volume and the weight of the whole oxygen system are obviously reduced, and the flying load and the cost of the airplane are reduced; the diaphragm type pressure difference switch which is simple in structure, small in size, light in weight and high in sensitivity is adopted to monitor and alarm the pressure difference between the inlet pressure and the outlet pressure of the filter body in real time, so that the problem of poor filtering effect caused by blockage of the filter body is solved, and the diaphragm type pressure difference switch is particularly suitable for air dewatering and filtering of an airborne oxygen system; in the diaphragm type pressure difference switch, 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 perspective view, partially in section, of a water removal filter for an airborne oxygen system in accordance with the present invention;

FIG. 2 is a front cross-sectional view of a water removal filter for an airborne oxygen system in accordance with the present invention;

fig. 3 is 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. 1, 2 and 3, the water removal filter for airborne oxygen system of the present invention comprises a housing (see upper housing 3 and lower housing 8 in fig. 1 and 2), an air inlet pipe 1 is arranged at the upper end of the housing, a water outlet hole 18 is arranged at the bottom of the housing, an air outlet pipe 9 is arranged on the outer wall of the housing, a spiral tooth piece 13 for removing water from gas and a filter body (see filter element seat 15 and filter element cartridge 14 in fig. 2) for filtering gas are installed in the housing, the vertical filter body is located at the central position in the housing, the spiral tooth piece 13 is installed around the outer wall of the middle upper part of the filter body, a gap is arranged between the outer wall of the spiral tooth piece 13 and the inner wall of the housing to facilitate the water of centrifugal separation to flow down along the inner wall of the housing, a filtering air inlet is arranged at the lower part of the filter body and located above the water outlet hole 18 of the housing, the upper part of the filtering body is provided with a filtering air outlet which is communicated with an air outlet pipe 9.

Preferably, the filter body comprises a filter element seat 15 and a filter element cylinder 14 arranged on the filter element seat 15; the inner wall 17 at the bottom of the shell is conical, and the water outlet hole 18 is positioned at the center of the conical shape; a connection installation part 5 is arranged on the gas outlet pipe 9 (or on the shell), a diaphragm type differential pressure switch 4 for monitoring the differential pressure between the gas inlet pressure and the gas outlet pressure of the filter body (in this case, the gas pressure at two ends of the filter element cylinder 14) is arranged on the connection installation part 5, the diaphragm type differential pressure switch 4 comprises a switch shell 41, a diaphragm 43, a spring 46, a valve rod 44 and a contact conductor 50, the switch shell 41 is provided with a shell inner cavity, the diaphragm 43 is arranged in the shell inner cavity and separates the shell inner cavity into an upper inner cavity 42 and a lower inner cavity 49, the positions in the switch shell 41 corresponding to the upper inner cavity 42 and the lower inner cavity 49 are respectively provided with a gas inlet collection 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 collection hole 51 for introducing the gas at the gas outlet side of the filter body into the lower inner cavity 49, and the specific implementation modes of the gas inlet collection hole 40 and the gas outlet collection hole 51 are determined according to the actual situation, as long as the 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 positioned 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 leads; the diaphragm type pressure difference 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 shell 41 is hermetically connected with the outer wall (also can be the outer wall of the shell) of the connection installation part 5 on the air outlet pipe 9 to form a sealed lower inner cavity 49, the non-metal ring 47 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 arranged on the transverse plate, the diaphragm 43 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 47, the spiral ring 48 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 47, a vertical central through hole is arranged at the central position of the transverse plate of the non-metal ring 47, the metal guide ring 45 is installed in the central through hole, the valve rod 44 penetrates through the vertical through hole of the metal guide ring 45 and can be in close contact with the vertical sliding, the upper end and the lower end of the spring 46 are respectively contacted 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 is used as a connecting end which is in conductive connection with the valve rod 44, the stud 53 is in threaded connection with the outer wall (also can be the outer wall of the shell) of the connecting and mounting part 5 on the air outlet pipe 9, the nonmetal sleeve 52 is sleeved on the stud 53, and the contact conductor 50 is sleeved outside the nonmetal sleeve 52; the casing includes interconnect's last casing 3 and lower casing 8, is equipped with integrated into one piece's "L" venturi tube 12 in going up casing 3, and tooth piece mount pad 11 is installed on the lower part outer wall of "L" venturi tube 12 through self internal thread, and the upper end of spiral tooth piece 13 is installed on the outer wall of tooth piece mount pad 11 through self internal thread.

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.

As shown in fig. 1-3, during operation, compressed air for oxygen generation enters the upper shell 3 from the air inlet pipe 1, rapidly impacts the spiral tooth blade 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 are acted by gravity, flow down along the inner wall of the upper shell 3 and the inner wall of the lower shell 8, 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 (6)

1. The utility model provides a dewatering filter for airborne oxygen system, includes the casing, the upper end of casing is equipped with the intake pipe, the bottom of casing is equipped with the apopore, be equipped with outlet duct, its characterized in that on the outer wall of casing: install the spiral tooth piece that is used for the gas dewatering in the casing and be used for the filterable filter body of gas, it is vertical the filter body is located central point in the casing puts, the spiral tooth piece around install in on the well upper portion outer wall of filter body, the outer wall of spiral tooth piece with be equipped with the clearance between the inner wall of casing, the lower part of filter body is equipped with and filters the air inlet just it is located to filter the air inlet the top of the apopore of casing, the upper portion of filter body is equipped with and filters the gas port just the filtration gas port with the outlet duct intercommunication.

2. The water removal filter for an on-board oxygen system of claim 1, wherein: the filter body comprises a filter element seat and a filter element cylinder arranged on the filter element seat.

3. The water removal filter for an on-board oxygen system of claim 1, wherein: the inner wall of the bottom of the shell is conical, and the water outlet hole is located in the center of the conical shape.

4. The water removal filter for an on-board oxygen system of claim 1, 2 or 3, wherein: the shell or the air outlet pipe is provided with a diaphragm type differential pressure switch for monitoring the pressure difference between the air inlet pressure and the air outlet pressure of the filter body, the diaphragm type differential pressure switch comprises a switch shell, a diaphragm, a spring, a valve rod and a contact conductor, 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, the positions in the switch shell corresponding to the upper inner cavity and the lower inner cavity are respectively provided with an air inlet collecting hole for introducing air at the air inlet side of the filter body into the upper inner cavity and an air outlet collecting hole for introducing air at the air outlet side of the filter body into the lower inner cavity, the valve rod and the contact conductor are both arranged in the lower inner cavity and are electric conductors, and the upper end of the valve rod is vertically contacted with the diaphragm and keeps upward stress through 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.

5. The water removal filter for an on-board oxygen system of claim 4, wherein: the diaphragm type differential pressure 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 outer wall of the shell or the outer wall of the air outlet pipe 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 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, and the valve rod penetrates through the vertical through hole of the metal guide ring and can be in close 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 or the connection of nonmetal ring, the metal guide ring as with the link that the valve pole electrically conductive is connected, the double-screw bolt with the outer wall of casing or the outer wall of outlet duct corresponds position threaded connection, nonmetal suit is in on the double-screw bolt, the contact conductor suit is in outside the nonmetal cover.

6. The water removal filter for an on-board oxygen system of claim 1, 2 or 3, wherein: the casing includes interconnect's last casing and lower casing, be equipped with integrated into one piece's "L" venturi tube in the last casing, the tooth piece mount pad is installed through self internal thread on the lower part outer wall of "L" venturi tube falls, the upper end of spiral tooth piece is installed through self internal thread on the outer wall of tooth piece mount pad.

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