CN114188181B - A height switch for aircraft waste water systems - Google Patents

Abstract

The invention discloses a height switch used in an aircraft waste water system, comprising a bouncing diaphragm; a sensor combination, which includes a sealed pressure chamber, an isolation diaphragm is arranged in the pressure chamber, and the isolation diaphragm is connected to the bounce through a cover plate. The diaphragm is freely connected; the isolating diaphragm is used to convert the pressure that changes with height into concentrated force and transmit it to the bouncing diaphragm, and the bouncing action of the bouncing diaphragm drives the movement of the center rod; the switch seat is combined, one end of which is connected to the socket signal, and the other end is connected to the socket signal. The other end is screwed with the sensor combination. During the use of the present invention, the pressure chamber feels the pressure, and the isolating diaphragm in it has different pressure values with different heights, and transmits the pressure value to the bouncing diaphragm, thereby driving the center rod to move , to convert the height signal into a displacement signal, and then transmit the signal to the socket to convert the displacement signal into a switch electrical signal and transmit it to an external system.

Description

A height switch for aircraft waste water systems

technical field

The invention belongs to the technical field of altitude switches for aircraft, and in particular relates to a height switch used in aircraft waste water systems.

Background technique

At present, the height switches widely used in aviation, aerospace and related fields are mainly metal diaphragm and corrugated diaphragm structures, and there are two main shortcomings:

Insufficient corrosion resistance, because the water vapor mixture in the aircraft wastewater system is corrosive, which will corrode the metal diaphragm and diaphragm in the height switch, limiting the service life of the height switch.

Contact ablation phenomenon, the height switch of the existing structure can be made into a smaller volume, but the closing and opening of the contact is relatively slow, and it is easy to generate sparks and arcs, resulting in ablation of the pressure switch contacts. The performance is more obvious in the vibration environment, which seriously affects the reliability and life of the pressure switch. Moreover, when the pressure value changes near the rated starting pressure value, the contacts will be repeatedly closed and disconnected, and the height switch will issue a false alarm signal. If there is an inductive load connected to the back end of the pressure switch, there will be an induced electromotive force at the moment when the contact is disconnected, which will accelerate the ablation of the contact point.

As the pressure switch application environment becomes more and more complex, there are many problems in the current principle of the height switch.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve or improve the above-mentioned problems by aiming at the above-mentioned deficiencies in the prior art, and to provide a height switch used in the aircraft waste water system.

In order to achieve the above object, the technical scheme that the present invention takes is:

A height switch for an aircraft wastewater system, comprising:

Bounce diaphragm;

The sensor combination includes a sealed pressure chamber, an isolation diaphragm is arranged in the pressure chamber, and the isolation diaphragm is freely connected with the bounce diaphragm through a cover plate; the isolation diaphragm is used to convert the pressure that changes with height into a concentrated force It is transmitted to the bouncing diaphragm, and the bouncing action of the bouncing diaphragm drives the movement of the center rod to convert the height signal into a displacement signal;

One end of the switch base assembly is connected with the socket signal, and the other end is connected with the sensor assembly threadedly, so as to convert the displacement signal into a switch quantity electrical signal and transmit it to an external system.

Further, a first sealing ring is installed between the isolation diaphragm and the lower casing, and a second sealing ring is installed between the isolation diaphragm and the center rod, and the space formed by pressing the cover plate and the nut is a pressure cavity.

Further, the cover plate includes 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.

Further, the upper cover plate, the lower cover plate and the isolation diaphragm are provided with corresponding through holes, a center rod is inserted through the through holes, the center rod extends upward, passes through the stopper and is combined with the switch seat.

Further, the bottom of the center rod is provided with a nut, the nut is connected with one end of the spring, and the other end of the spring is connected with an adjusting nut, and the adjusting nut adjusts the spring compression to adjust the initial state of the bouncing diaphragm.

Further, the socket is mounted on the casing by the first screw, the bottom of the casing is mounted on the upper casing of the sensor combination by the second screw, and a sealing ring is arranged between the casing and the upper casing, and the first fuse and the second fuse are provided with a sealing ring. The first screw, the second screw and the ventilation screw are fixed; the first screw and the ventilation screw are both installed on the casing, and a "T"-shaped hole is opened on the first screw.

Further, the switch seat combination and the sensor combination are connected by threads, and are locked and positioned by the locking nut; the switch seat combination and the socket are connected by wires, and the wires transmit electrical signals to the socket for external system collection and use.

Further, the sensor assembly includes an upper casing and a lower casing, and a sealing ring mounting groove is opened between the upper casing and the lower casing.

Further, the material of the isolating diaphragm is a non-metallic material and adopts corrugated molding.

Further, the lower casing is fixedly connected with the mounting plate, and is fixed on the aircraft through the mounting plate.

The height switch for the aircraft wastewater system provided by the present invention has the following beneficial effects:

1. During the use of the present invention, the pressure chamber feels pressure, and the isolating diaphragm in it has different pressure values with different heights, and the pressure value is transmitted to the bouncing diaphragm, thereby driving the center The rod moves to convert the height signal into a displacement signal, and then the signal is transmitted to the socket to convert the displacement signal into a switch value electrical signal and transmit it to an external system.

2. The present invention can be used to sense the pressure difference between the aircraft waste water tank and the cabin, and can indirectly control the height switch of the power supply of the vacuum pump. The switch is not resistant to corrosion and contact ablation problems.

3. The present invention utilizes the characteristics of rapid action and sudden displacement of the bouncing diaphragm, which can improve the speed of turning on and off the height switch, avoid the contact gap of the height switch being too small, and solve the problem of repeated pressure switches in the vibration environment of the existing height switch. Problems with contact ablation caused by making and breaking.

4. The isolation diaphragm of the present invention adopts corrosion-resistant non-metallic materials, which can realize the transmission of high pressure signals, realize the isolation of waste water in the aircraft waste water system and the internal parts of the product, and can effectively improve the service life of the height switch.

5. By adjusting the pre-pressure of the spring on the bouncing diaphragm, the present invention can meet the requirements of various height working points on the premise that the height structure is unchanged.

6. The bouncing system provided by the present invention is composed of a bouncing diaphragm and a spring. The initial state of the bouncing system is that the bouncing diaphragm is in a positive jumping state, so as to realize the stable measurement of the small vacuum degree height signal.

7. The switch seat of the present invention is combined into a sealed structure, which acts as an electrical signal conversion unit, and the contacts are in a good working environment, which improves the ablation resistance of the contacts.

8. The present invention limits the bouncing position of the bouncing diaphragm, wherein the upper casing of the sensor combination can limit the position where the bouncing diaphragm is bouncing, and the stopper is used to limit the bouncing position to ensure the long-term stability of the height switch Work.

Description of drawings

FIG. 1 is a schematic structural diagram of a height switch used in an aircraft waste water system.

Figure 2 is a front view of a height switch for an aircraft waste water system.

Among them, 1. Lower shell; 2. Cover plate; 3. Mounting plate; 4. Upper shell; 5. Bounce diaphragm; 6. Stopper; 7. Center rod; 8. Socket; 9. Conductor; 10. Switch Seat combination; 11, second sealing ring; 12, first sealing ring; 13, isolating diaphragm; 14, nut; 15, spring; 16, adjusting nut; 17, second screw; 18, shell; 19, first screw; 20, vent screw; 21, first fuse; 22, locking screw; 23, second fuse.

Detailed ways

The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes Such changes are obvious within the spirit and scope of the present invention as defined and determined by the appended claims, and all inventions and creations utilizing the inventive concept are within the scope of protection.

According to an embodiment of the present application, referring to FIG. 1 , the height switch for an aircraft wastewater system of the present solution includes:

The bouncing diaphragm 5 overcomes the elastic force of the spring 15 and bounces back during operation. At this time, the state of the switch seat assembly 10 is switched, and the socket 8 outputs a signal for state switching.

The sensor combination includes a sealed pressure cavity, an isolation diaphragm 13 is arranged in the pressure cavity, and the isolation diaphragm 13 is freely connected with the bounce diaphragm 5 through the cover plate 2; the isolation diaphragm 13 is used to The pressure is converted into concentrated force and transmitted to the bouncing diaphragm 5, and the bouncing action of the bouncing diaphragm 5 drives the center rod 7 to move, so as to convert the height signal into a displacement signal.

One end of the switch base assembly 10 is signal-connected to the socket 8, and the other end is threadedly connected to the sensor assembly, so as to convert the displacement signal into a switch-value electrical signal and transmit it to an external system.

The bouncing diaphragm 5 of the present invention is a diaphragm that can undergo sudden change in displacement when it is loaded or unloaded to a certain extent. The characteristic of sudden change in displacement can improve the speed of turning on and off the annunciator and improve the problem that the gap between the contact points of the annunciator is too small. To avoid the phenomenon that the contacts of the annunciator are repeatedly connected and disconnected in the vibration environment, so as to improve or avoid the problem of contact point ablation, the non-metallic diaphragm as the isolation diaphragm 13 has the characteristics of corrosion resistance and low cost. The height switch designed by using the bouncing diaphragm 5 and the non-metallic isolating diaphragm 13 can effectively solve the problems of contact ablation and corrosion resistance.

The pressure chamber of the present invention is formed such that a first sealing ring 12 is installed between the isolation diaphragm 13 and the lower casing 1 , and a second sealing ring 11 is installed between the isolation diaphragm 13 and the center rod 7 , and is installed through the cover The space formed by pressing the plate 2 and the nut 14 is a pressure cavity.

As a further embodiment of the cover plate 2 of the present invention, the cover plate 2 includes 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 the specific operation, the pressure is transmitted to the isolation diaphragm 13, the isolation diaphragm 13 feels the change of the pressure with the change of height, converts the pressure into a concentrated force and transmits it to the bouncing diaphragm 5 and the spring 15, and the bouncing diaphragm 5 bounces, and then Drive the center rod 7 to move up and down to realize the conversion and transmission of the signal.

Corresponding through holes are provided on the upper cover plate, the lower cover plate and the isolation diaphragm 13, and a central rod 7 is penetrated in the through hole. ; The stopper 6 is used to limit the bounce position of the bounce diaphragm 5, the center rod 7 moves, and the displacement signal is transmitted to the switch seat combination 10.

The bottom of the center rod 7 is provided with a nut 14, the nut 14 is connected with one end of the spring 15, and the other end of the spring 15 is connected with the adjusting nut 16, and the adjusting nut 16 adjusts the compression amount of the spring 15 to adjust the pre-pressure of the initial state of the bounce diaphragm 5 .

The center rod 7, as the displacement transmission part, is freely connected with the bouncing diaphragm 5 through the adjusting nut 16, the upper cover plate and the lower cover plate.

As a further embodiment of the socket 8 of the present invention, the socket 8 is mounted on the housing 18 by the first screw 19, the bottom of the housing 18 is mounted on the upper housing 4 of the sensor combination by the second screw 17, and the housing 18 and the upper housing 4 are connected. There is a sealing ring embedded between them, and the first screw 19, the second screw 17 and the ventilation screw 20 are secured and fixed by the first fuse 21 and the second fuse 23 to prevent loosening and falling off.

The first screw 19 and the vent screw 20 are both mounted on the casing 18, and the first screw 19 has a "T"-shaped hole, which can effectively prevent dust and ensure that the interior of the height switch is consistent with the cabin pressure.

The switch seat combination 10 and the sensor combination are connected by thread, and are locked and positioned by the lock nut 14; the switch seat combination 10 and the socket 8 are connected by the wire 9, and the wire 9 transmits the electrical signal to the socket 8 for external use. System collection and use.

The sensor combination includes an upper casing 4 and a lower casing 1, and a sealing ring installation groove is opened between the upper casing 4 and the lower casing 1, so that the compression amount of the sealing ring is suitable and the air tightness of the product is qualified.

The switch seat combination 10 terminals are led out by glass sintering, and the gasket conversion part of the product is in a sealed environment

The isolating diaphragm 13 is made of non-metallic material, and adopts corrugated molding to ensure that the non-metallic diaphragm satisfies the displacement requirement when moving up and down, and ensures the service life of the non-metallic diaphragm.

Thread locking agent is applied between the height switch adjusting nut 16 and the combined threads of the sensor to ensure the stability of the height switch during use.

The lower casing 1 is fixedly connected to the mounting plate 3, and is connected to the aircraft through the mounting plate 3. The size of the mounting plate 3 of the present invention is not limited, and can be improved and designed according to different installation positions.

The present invention is used for the working principle of the height switch of the aircraft waste water system, including:

The present invention is connected to the aircraft through the mounting plate 3, the switch seat assembly 10 is installed on the upper casing 4 of the sensor assembly through threads, and the locking screw 22 is used for locking and fixing, and at the same time, the locking nut 14 can be used for positioning. , adjust the upper and lower positions to adjust the pre-pressure between the displacement of the switch seat combination 10 and the sensor combination, and compress the spring 15 to adjust the pre-pressure of the initial state of the bounce diaphragm 5; and install the socket 8 on the housing 18 through the first screw 19 , and use the wire 9 to connect the switch seat combination 10 and the socket 8.

During the specific operation, the isolation diaphragm 13 feels the change of the pressure with the height, and converts the pressure into concentrated force and transmits it to the bounce diaphragm 5 and the spring 15. Specifically, as the height increases, the pressure decreases. When the specified height value is reached , the bouncing diaphragm 5 overcomes the elastic force of the spring 15 and realizes the rebound action. At this time, the bouncing diaphragm 5 bounces, and then drives the center rod 7 to move. The movement of the center rod 7 converts the height signal into a displacement signal, and touches the switch combination. , the state of the switch base assembly 10 is switched, and the output signal is output through the socket 8 to convert the displacement signal into a switch quantity electrical signal and transmit it to the external system.

Although the specific embodiments of the invention have been described in detail with reference to the accompanying drawings, they should not be construed as limiting the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative work still belong to the protection scope of this patent.

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.

Images