CN114188181B - Height switch for aircraft wastewater system - Google Patents
Height switch for aircraft wastewater system Download PDFInfo
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- CN114188181B CN114188181B CN202210143757.0A CN202210143757A CN114188181B CN 114188181 B CN114188181 B CN 114188181B CN 202210143757 A CN202210143757 A CN 202210143757A CN 114188181 B CN114188181 B CN 114188181B
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- diaphragm
- bouncing
- switch
- pressure
- cover plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
- H01H35/343—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm by snap acting diaphragm
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
The invention discloses a height switch for an aircraft wastewater system, which comprises a bouncing membrane; the sensor combination comprises a pressure cavity which is arranged in a sealing way, an isolation diaphragm is arranged in the pressure cavity, and the isolation diaphragm is freely connected with a bouncing diaphragm through a cover plate; the isolation diaphragm is used for converting the pressure changing along with the height into a concentrated force and transmitting the concentrated force to the bouncing diaphragm, and the bouncing diaphragm bounces to drive the central rod to move; and one end of the switch seat assembly is in signal connection with the socket, and the other end of the switch seat assembly is in threaded connection with the sensor assembly. In the use process of the invention, the pressure cavity body senses pressure, the isolating diaphragm senses different pressure values along with different heights, the pressure values are transmitted to the bouncing diaphragm, the center rod is driven to move, so that the height signal is converted into a displacement signal, and then the signal is transmitted to the socket, so that the displacement signal is converted into a switching value electric signal and is transmitted to an external system.
Description
Technical Field
The invention belongs to the technical field of altitude switches for airplanes, and particularly relates to an altitude switch for an airplane wastewater system.
Background
At present, the altitude switch widely applied to the fields of aviation, aerospace and the like mainly has a metal bellows type and a corrugated diaphragm type structure, and has two main defects:
the corrosion resistance is insufficient, and the service life of the altitude switch is limited because the water-vapor mixture in the aircraft wastewater system is corrosive and can corrode the metal membrane and the membrane box in the altitude switch.
The contact ablation phenomenon is that the height switch with the existing structure can be made into a smaller size, but the contact is slowly closed and opened, so that sparks and electric arcs are easily generated, and the contact ablation of the pressure switch is caused. The pressure switch is more obvious in the vibration environment, and the reliability and the service life of the pressure switch are seriously influenced. And when the pressure value changes near the rated starting pressure value, the contact can be repeatedly closed and opened, and the height switch can send out a false alarm signal. If an inductive load is connected to the rear end of the pressure switch, an induced electromotive force exists at the moment of contact opening, and ablation of the contact is accelerated.
With the increasing complexity of the pressure switch application environment, the height switch of the present principle has many problems.
Disclosure of Invention
The present invention addresses the above-identified deficiencies in the art by providing an altitude switch for an aircraft waste water system that solves or ameliorates the above-identified problems.
In order to achieve the purpose, the invention adopts the technical scheme that:
an altitude switch for an aircraft waste water system, comprising:
a bouncing membrane;
the sensor combination comprises a pressure cavity which is arranged in a sealing way, an isolation diaphragm is arranged in the pressure cavity, and the isolation diaphragm is freely connected with a bouncing diaphragm through a cover plate; the isolation diaphragm is used for converting the pressure changing along with the height into a concentrated force and transmitting the concentrated force to the bouncing diaphragm, and the bouncing diaphragm bounces to drive the central rod to move so as to convert the height signal into a displacement signal;
and one end of the switch seat assembly is connected with the socket signal, and the other end of the switch seat assembly is in threaded connection with the sensor assembly and is used for converting the displacement signal into a switching value electric signal and transmitting the switching value electric signal to an external system.
Furthermore, a first sealing ring is arranged between the isolation diaphragm and the lower shell, a second sealing ring is arranged between the isolation diaphragm and the central rod, and a space formed by compressing the isolation diaphragm and the central rod through a cover plate and a nut is used as a pressure cavity.
Further, the cover plate comprises an upper cover plate and a lower cover plate, the isolation diaphragm is located between the upper cover plate and the lower cover plate, and the bouncing diaphragm is arranged on the upper cover plate.
Furthermore, corresponding through holes are formed in the upper cover plate, the lower cover plate and the isolating diaphragm, a central rod penetrates through the through holes, and the central rod extends upwards and is in combined contact with the switch base after penetrating through the retainer.
Furthermore, a nut is arranged at the bottom of the central rod, the nut is connected with one end of the spring, the other end of the spring is connected with the adjusting nut, and the adjusting nut adjusts the compression amount of the spring so as to adjust the pre-pressure of the bouncing diaphragm in the initial state.
Furthermore, the socket is arranged on the shell through a first screw, the bottom of the shell is arranged on the upper shell of the inductor assembly through a second screw, a sealing ring is arranged between the shell and the upper shell, and the first screw, the second screw and the ventilation screw are fixed through a first fuse and a second fuse; the first screw and the ventilation screw are both arranged on the shell, and a T-shaped hole is formed in the first screw.
Furthermore, the switch seat combination and the sensor combination are in threaded connection and are locked and positioned through a locking nut; the switch seat combination is connected with the socket through a wire, and the wire transmits the electric signal to the socket so as to be collected and used by an external system.
Further, the sensor combination includes shell and lower shell down, has seted up the sealing washer mounting groove between shell and the lower shell.
Furthermore, the isolation diaphragm is made of non-metal materials and is formed by corrugation.
Further, the lower shell is fixedly connected with the mounting plate and is fixed on the airplane through the mounting plate.
The height switch for the aircraft wastewater system provided by the invention has the following beneficial effects:
1. in the use process of the invention, the pressure cavity body senses pressure, the isolating diaphragm senses different pressure values along with different heights, the pressure values are transmitted to the bouncing diaphragm, the center rod is driven to move, so that the height signal is converted into a displacement signal, and then the signal is transmitted to the socket, so that the displacement signal is converted into a switching value electric signal and is transmitted to an external system.
2. The height switch can be used for sensing the pressure difference between the airplane wastewater tank and the pressure in the cabin, can indirectly control the on-off of the power supply of the vacuum pump, and solves the problems of non-corrosion resistance and contact ablation of the traditional height switch by utilizing the corrosion resistance of the non-metal isolation diaphragm and the displacement snap-through characteristic of the bouncing diaphragm.
3. The invention utilizes the characteristics of rapid action and displacement mutation of the bouncing membrane, can improve the speed of switching on and off the height switch, avoids the contact clearance of the height switch from being too small, and solves the problem of contact ablation caused by repeated switching on and off of the pressure switch in the vibration environment of the existing height switch.
4. The isolation diaphragm is made of corrosion-resistant non-metallic materials, so that the transmission of altitude pressure signals can be realized, the isolation between the waste water in an aircraft waste water system and internal parts of a product can be realized, and the service life of the altitude switch can be effectively prolonged.
5. The invention can meet the requirements of various height working points on the premise of unchanged height structure by adjusting the pre-pressure of the spring on the bouncing diaphragm.
6. The initial state of the bouncing system is that the bouncing membrane is in a positive bouncing state, so that the stable measurement of the small vacuum degree height signal is realized.
7. The switch base is combined into a sealing structure, the sealing structure is used as an electric signal conversion unit, and the contact is in a good working environment, so that the ablation resistance of the contact is improved.
8. The invention limits the bounce position of the bounce diaphragm, wherein the upper shell of the sensor combination can limit the positive bounce position of the bounce diaphragm, and the stopper is used for limiting the reverse bounce position so as to ensure the long-term stable work of the height switch.
Drawings
FIG. 1 is a schematic diagram of a height switch for an aircraft waste water system.
FIG. 2 is a front view of an altitude switch for an aircraft waste water system.
Wherein, 1, a lower shell; 2. a cover plate; 3. mounting a plate; 4. an upper housing; 5. a bouncing membrane; 6. a stopper; 7. a center pole; 8. a socket; 9. a wire; 10. combining a switch seat; 11. a second seal ring; 12. a first seal ring; 13. an isolation diaphragm; 14. a nut; 15. a spring; 16. adjusting the nut; 17. a second screw; 18. a housing; 19. a first screw; 20. a venting screw; 21. a first fuse; 22. locking the screw; 23. a second fuse.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
According to one embodiment of the present application, with reference to fig. 1, the present solution provides an altitude switch for an aircraft wastewater system, comprising:
and the bouncing diaphragm 5 overcomes the elastic force of the spring 15 during operation, rebounds, and at the moment, the state of the switch base combination 10 is switched, and a signal for switching the state is output through the socket 8.
The sensor combination comprises a pressure cavity which is arranged in a sealing way, an isolation diaphragm 13 is arranged in the pressure cavity, and the isolation diaphragm 13 is freely connected with the bouncing diaphragm 5 through a cover plate 2; the isolation diaphragm 13 is used for converting the pressure changing along with the height into a concentrated force to be transmitted to the bouncing diaphragm 5, and the bouncing diaphragm 5 bounces to drive the center rod 7 to move so as to convert the height signal into a displacement signal.
And one end of the switch seat assembly 10 is in signal connection with the socket 8, and the other end of the switch seat assembly is in threaded connection with the sensor assembly, so that the displacement signal is converted into a switching value electric signal and is transmitted to an external system.
The bouncing diaphragm 5 is a diaphragm which can generate displacement mutation when being loaded or unloaded to a certain degree, the displacement mutation characteristic can improve the speed of switching on and off of a annunciator and solve the problem that the gap between contact points of the annunciator is too small, the phenomenon that the contact points of the annunciator are repeatedly switched on and off in a vibration environment is avoided, and therefore the problem of contact point ablation is improved or avoided, the nonmetal diaphragm serving as the isolation diaphragm 13 has the characteristics of corrosion resistance, low cost and the like, and the problems of contact point ablation and corrosion resistance can be effectively solved by utilizing the height switch designed by the bouncing diaphragm 5 and the nonmetal isolation diaphragm 13.
The pressure cavity is formed by installing a first sealing ring 12 between an isolation diaphragm 13 and a lower shell 1, installing a second sealing ring 11 between the isolation diaphragm 13 and a central rod 7, and pressing the pressure cavity by a cover plate 2 and a nut 14 to form a space as the pressure cavity.
As a further embodiment of the cover plate 2 of the present invention, the cover plate 2 comprises an upper cover plate and a lower cover plate, the isolation diaphragm 13 is located between the upper cover plate and the lower cover plate, and the bouncing diaphragm 5 is arranged on the upper cover plate; during specific operation, pressure is transmitted to the isolation diaphragm 13, the isolation diaphragm 13 senses the change of the pressure along with the change of the height, the pressure is converted into concentrated force and transmitted to the bouncing diaphragm 5 and the spring 15, the bouncing diaphragm 5 bounces to drive the central rod 7 to move up and down, and therefore the conversion and transmission of signals are achieved.
Corresponding through holes are formed in the upper cover plate, the lower cover plate and the isolation diaphragm 13, the central rod 7 penetrates through the through holes, and the central rod 7 extends upwards and is contacted with the switch base combination 10 after penetrating through the retainer 6; the stopper 6 is used to limit the anti-bounce position of the bouncing diaphragm 5, the central rod 7 moves and transmits the displacement signal into the switch seat assembly 10.
The bottom of the central rod 7 is provided with a nut 14, the nut 14 is connected with one end of a spring 15, the other end of the spring 15 is connected with an adjusting nut 16, and the adjusting nut 16 adjusts the compression amount of the spring 15 so as to adjust the pre-pressure of the initial state of the bouncing diaphragm 5.
The central rod 7 is used as a displacement transmission part and is freely connected with the bouncing membrane 5 through an adjusting nut 16, an upper cover plate and a lower cover plate, and the excircle of the bouncing membrane 5 is limited through the upper shell 4 of the sensor assembly.
As a further embodiment of the socket 8 of the present invention, the socket 8 is mounted on the housing 18 by a first screw 19, the bottom of the housing 18 is mounted on the upper housing 4 of the sensor assembly by a second screw 17, and a seal ring is embedded between the housing 18 and the upper housing 4, and the first screw 19, the second screw 17 and the vent screw 20 are fastened by a first fuse 21 and a second fuse 23 to prevent loosening and falling off.
The first screw 19 and the ventilation screw 20 are both arranged on the shell 18, and a T-shaped hole is formed in the first screw 19, so that the dust can be effectively prevented, and the interior of the height switch is kept consistent with the pressure of a cabin.
The switch base combination 10 is in threaded connection with the sensor combination and is locked and positioned through a locking nut 14; the switch seat assembly 10 and the socket 8 are connected through a wire 9, and the wire 9 transmits an electric signal to the socket 8 for an external system to collect and use.
The sensor combination comprises an upper shell 4 and a lower shell 1, and a sealing ring mounting groove is formed between the upper shell 4 and the lower shell 1, so that the compression amount of a sealing ring is appropriate, and the air tightness of a product is guaranteed to be qualified.
The switch seat combination 10 wiring terminal is led out by glass sintering, and the conversion part of the product gasket is in a sealed environment
And a thread locking agent is coated between the height switch adjusting nut 16 and the combined threads of the sensor so as to ensure the stability of the height switch in the use process.
The lower shell 1 is fixedly connected with the mounting plate 3 and is connected with the airplane through the mounting plate 3, the size of the mounting plate 3 is not limited, and the improved design can be carried out according to different mounting positions.
The working principle of the height switch for the aircraft wastewater system comprises the following steps:
the invention is connected with an airplane through a mounting plate 3, a switch base combination 10 is arranged on an upper shell 4 of a sensor combination through threads and is locked and fixed by a locking screw 22, meanwhile, the switch base combination 10 and the sensor combination can be positioned through a locking nut 14, the up-down position is adjusted to adjust the pre-pressure between the switch base combination 10 and the displacement of the sensor combination, and a compression spring 15 is used for adjusting the pre-pressure of the initial state of a bounce diaphragm 5; and the socket 8 is arranged on the shell 18 through a first screw 19, and the wire 9 is used for connecting the switch seat combination 10 and the socket 8.
During specific operation, the isolating diaphragm 13 senses the change of pressure along with the change of height, the pressure is converted into concentrated force and is transmitted to the bouncing diaphragm 5 and the spring 15, the pressure is reduced along with the increase of the height, when the specified height value is reached, the bouncing diaphragm 5 overcomes the elastic force of the spring 15 to realize the rebound action, at the moment, the bouncing diaphragm 5 bounces to drive the central rod 7 to move, the central rod 7 moves to convert a height signal into a displacement signal and trigger the switch combination, the state of the switch seat combination 10 is switched, and the signal is output through the socket 8 to convert the displacement signal into a switching value electric signal and transmit the switching value electric signal to an external system.
While the embodiments of the invention have been described in detail in connection with the accompanying drawings, it is not intended to limit the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (8)
1. An altitude switch for an aircraft waste water system, comprising:
a bouncing membrane;
the sensor combination comprises a pressure cavity which is arranged in a sealing way, an isolation diaphragm is arranged in the pressure cavity, and the isolation diaphragm is freely connected with a bouncing diaphragm through a cover plate; the isolation diaphragm is used for converting the pressure changing along with the height into a concentrated force and transmitting the concentrated force to the bouncing diaphragm, and the bouncing diaphragm bounces to drive the central rod to move so as to convert the height signal into a displacement signal;
the bottom of the central rod is provided with a nut, the nut is connected with one end of a spring, the other end of the spring is connected with an adjusting nut, and the adjusting nut adjusts the compression amount of the spring so as to adjust the pre-pressure of the initial state of the bouncing diaphragm;
one end of the switch seat combination is connected with the socket signal, and the other end of the switch seat combination is in threaded connection with the sensor combination and is used for converting the displacement signal into a switching value electric signal and transmitting the switching value electric signal to an external system;
the switch seat combination and the sensor combination are positioned by locking the nuts, the up-and-down position is adjusted to adjust the pre-pressure between the displacements of the switch seat combination and the sensor combination, and the pre-pressure of the initial state of the bouncing membrane is adjusted by compressing the spring;
the isolating diaphragm senses the change of pressure along with the change of height, converts the pressure into concentrated force and transmits the concentrated force to the bouncing diaphragm and the spring, the pressure is reduced along with the increase of the height, when the height reaches a specified height value, the bouncing diaphragm overcomes the elasticity of the spring to realize the rebound action, at the moment, the bouncing action of the bouncing diaphragm drives the central rod to move, the movement of the central rod converts a height signal into a displacement signal and triggers the switch combination, the state of the switch seat combination is switched, and the signal is output through the socket so as to convert the displacement signal into a switching value electric signal and transmit the switching value electric signal to an external system;
the isolation diaphragm is made of non-metal materials and is formed by adopting corrugations.
2. The altitude switch for an aircraft wastewater system according to claim 1, wherein: a first sealing ring is arranged between the isolation diaphragm and the lower shell, a second sealing ring is arranged between the isolation diaphragm and the central rod, and the isolation diaphragm and the central rod are compressed through a cover plate and a nut to form a space as a pressure cavity.
3. The altitude switch for an aircraft wastewater system according to claim 2, wherein: the cover plate comprises an upper cover plate and a lower cover plate, the isolation diaphragm is located between the upper cover plate and the lower cover plate, and the bouncing diaphragm is arranged on the upper cover plate.
4. The altitude switch for an aircraft wastewater system according to claim 3, wherein: corresponding through holes are formed in the upper cover plate, the lower cover plate and the isolating diaphragm, a central rod penetrates through the through holes, extends upwards and is in combined contact with the switch base after penetrating through the retainer.
5. The altitude switch for an aircraft wastewater system according to claim 1, wherein: the socket is arranged on the shell through a first screw, the bottom of the shell is arranged on the upper shell of the inductor assembly through a second screw, a sealing ring is arranged between the shell and the upper shell, and the first screw, the second screw and the ventilation screw are fixed through a first fuse and a second fuse; the first screw and the ventilation screw are both arranged on the shell, and a T-shaped hole is formed in the first screw.
6. The altitude switch for an aircraft wastewater system according to claim 1, wherein: the switch seat combination is connected with the socket through a wire, and the wire transmits the electric signal to the socket so as to be collected and used by an external system.
7. The altitude switch for an aircraft wastewater system according to claim 1, wherein: the sensor combination comprises an upper shell and a lower shell, and a sealing ring mounting groove is formed between the upper shell and the lower shell.
8. The altitude switch for an aircraft wastewater system according to claim 7, wherein: the lower shell is fixedly connected with the mounting plate and is fixed on the airplane through the mounting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210143757.0A CN114188181B (en) | 2022-02-17 | 2022-02-17 | Height switch for aircraft wastewater system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210143757.0A CN114188181B (en) | 2022-02-17 | 2022-02-17 | Height switch for aircraft wastewater system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114188181A CN114188181A (en) | 2022-03-15 |
| CN114188181B true CN114188181B (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210143757.0A Active CN114188181B (en) | 2022-02-17 | 2022-02-17 | Height switch for aircraft wastewater system |
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| Country | Link |
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| CN (1) | CN114188181B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114496647B (en) * | 2022-04-08 | 2022-09-09 | 成都凯天电子股份有限公司 | Small-sized pressure switch |
Citations (10)
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|---|---|---|---|---|
| US2718565A (en) * | 1950-06-14 | 1955-09-20 | Speed Dev Company Ltd | Fluid pressure operated switches |
| GB845592A (en) * | 1957-07-19 | 1960-08-24 | Cleve Davis Allen Van | Pressure responsive electric switch device |
| GB1089305A (en) * | 1965-05-31 | 1967-11-01 | Speed Dev Company Ltd | A pressure actuated electric control switch |
| DE4205264A1 (en) * | 1992-02-21 | 1993-08-26 | Draegerwerk Ag | MEASURING HEAD FOR A PRESSURE MEASURING DEVICE WITH A PRESSURE SENSOR FOR THE SIMULTANEOUS OPERATION OF A SWITCHING CONTACT |
| CN1390297A (en) * | 1999-09-15 | 2003-01-08 | 液体元件国际公司 | Thermal dispersion mass flow rate and liquid level switch/transmitter |
| CN1909138A (en) * | 2005-08-02 | 2007-02-07 | 宁波市塞纳电热电器有限公司 | Pressure switch |
| CN200953310Y (en) * | 2006-09-30 | 2007-09-26 | 常州盛士达传感器有限公司 | Pressure switch |
| EP2009664A1 (en) * | 2007-06-04 | 2008-12-31 | Olab S.r.l. | Pressure switch with a metal membrane |
| CN206349300U (en) * | 2016-12-15 | 2017-07-21 | 武汉神动汽车电子电器股份有限公司 | A kind of diaphragm type pressure switch for automobile brake refrigeration system |
| CN111640595A (en) * | 2020-05-29 | 2020-09-08 | 成都凯天电子股份有限公司 | Nuclear grade limit switch for monitoring opening and closing states of nuclear grade valve |
-
2022
- 2022-02-17 CN CN202210143757.0A patent/CN114188181B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2718565A (en) * | 1950-06-14 | 1955-09-20 | Speed Dev Company Ltd | Fluid pressure operated switches |
| GB845592A (en) * | 1957-07-19 | 1960-08-24 | Cleve Davis Allen Van | Pressure responsive electric switch device |
| GB1089305A (en) * | 1965-05-31 | 1967-11-01 | Speed Dev Company Ltd | A pressure actuated electric control switch |
| DE4205264A1 (en) * | 1992-02-21 | 1993-08-26 | Draegerwerk Ag | MEASURING HEAD FOR A PRESSURE MEASURING DEVICE WITH A PRESSURE SENSOR FOR THE SIMULTANEOUS OPERATION OF A SWITCHING CONTACT |
| CN1390297A (en) * | 1999-09-15 | 2003-01-08 | 液体元件国际公司 | Thermal dispersion mass flow rate and liquid level switch/transmitter |
| CN1909138A (en) * | 2005-08-02 | 2007-02-07 | 宁波市塞纳电热电器有限公司 | Pressure switch |
| CN200953310Y (en) * | 2006-09-30 | 2007-09-26 | 常州盛士达传感器有限公司 | Pressure switch |
| EP2009664A1 (en) * | 2007-06-04 | 2008-12-31 | Olab S.r.l. | Pressure switch with a metal membrane |
| CN206349300U (en) * | 2016-12-15 | 2017-07-21 | 武汉神动汽车电子电器股份有限公司 | A kind of diaphragm type pressure switch for automobile brake refrigeration system |
| CN111640595A (en) * | 2020-05-29 | 2020-09-08 | 成都凯天电子股份有限公司 | Nuclear grade limit switch for monitoring opening and closing states of nuclear grade valve |
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| Publication number | Publication date |
|---|---|
| CN114188181A (en) | 2022-03-15 |
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