CN213301546U - High-reliability double-margin pressure annunciator - Google Patents

Abstract

The utility model discloses a high-reliability double-margin pressure annunciator, which comprises a shell, wherein a switch combination and a sensor mechanism are sequentially arranged inside the shell from inside to outside, and a socket is arranged outside the shell; the sensor mechanism comprises a stopper, a push rod, a pressure diaphragm box and a filler neck which are sequentially arranged from inside to outside, wherein one end of the push rod penetrates through the stopper in a sliding mode and is connected with a switch combination, the pressure diaphragm box is connected with the switch combination through the push rod, and two microswitches which are arranged in parallel are arranged in the switch combination. The utility model discloses mainly used has better reliability in the engine field of high temperature, realizes accurate stable carrying out monitor control to system medium pressure, has better practicality.

Description

High-reliability double-margin pressure annunciator

Technical Field

The utility model belongs to the technical field of pressure signal ware, concretely relates to high reliable two margin pressure signal ware.

Background

With the development of modern industry, the testing of fluid pressure state is a challenging problem, and due to different fluid media and the harsh working environment, in industrial automation control, the pressure annunciator is widely applied to various fluid pressure measurements, and the characteristics of accuracy, reliability, stability and long service life are required to be provided for the annunciator.

The current pressure annunciator is easy to have an unstable state and poor in reliability under severe conditions, and the conditions of spring piece deformation and microswitch failure are easy to occur in the using process. The performance, reliability and stability of the annunciators are more demanding, particularly in the aerospace and aircraft field as well as in advanced industrial applications. The development of aircraft towards supersonic speed and high stealth performance requires the development of pressure annunciators towards miniaturization, high reliability and high environmental adaptability. The pressure annunciator in the aircraft monitors various pressure indexes of different subsystems, transmits accurate information to a superior system and an aircraft operator, feeds back the working state of the aircraft in time, and accurately masters the running condition of equipment. The pressure annunciator plays an important role in monitoring cabin pressure, oxygen pressure, fuel oil pressure and lubricating oil pressure, and ensures safe and reliable work of the aircraft and an engine system. In the field of aerospace, the pressure annunciator is required to work normally under severe environments such as extremely low temperature, extremely high temperature, high radiation and the like, so that the small-sized annunciator plays an important role in the aerospace craft.

In harsh fluid working environments, conventional electronic pressure annunciators cannot be used in particular applications due to temperature, radiation, and corrosion. When a pressure annunciator using electronic components is used in an environment with extremely low temperature, extremely high temperature and radiation environment for a long time, the electronic sensor can be aged in advance and failed in use. For pressure measurement of special medium liquid (corrosiveness), a pressure annunciator using electronic components needs to carry out isolation protection on sensitive elements, the precision of the pressure annunciator is lost in the process, the structure is redundant and complex, the service life is short in use, and the pressure annunciator cannot bear large-amplitude vibration. And in highly electrified integrated systems, crosstalk is likely to occur during electromagnetic compatibility and the like.

Pressure annunciators are widely used in the mechanical field and play an important role in the state transition process of automation equipment. In the mechanical design, the working environment of the pressure annunciator is severe, the pressure annunciator needs to be used for a long time, the requirements on the service life and the reliability are high, and the pressure annunciator has important value on industrial development. The utility model discloses a according to specific requirement, improve current pressure signal ware product, provide the miniaturized pressure signal ware of a two margin high reliability.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high reliable two margin pressure signal wares, the utility model discloses mainly used has better reliability in the engine field of high temperature, realizes accurate stable carrying out monitor control to system medium pressure, has better practicality.

The utility model discloses mainly realize through following technical scheme:

a high-reliability double-margin pressure annunciator comprises a shell, wherein a switch combination and a sensor mechanism are sequentially arranged inside the shell from inside to outside, and a socket is arranged on the outer side of the shell; the sensor mechanism comprises a stopper, a push rod, a pressure diaphragm box and a filler neck which are sequentially arranged from inside to outside, wherein one end of the push rod penetrates through the stopper in a sliding mode and is connected with a switch combination, the pressure diaphragm box is connected with the switch combination through the push rod, and two microswitches which are arranged in parallel are arranged in the switch combination.

The pressure diaphragm box is suitable for two media of gas and liquid, and has large sensing range for medium fluid and strong adaptability. The working temperature is from 2200 ℃ to 55 ℃ below zero, and the method has the characteristics of strong adaptability and good stability.

The stop ensures that the bellows is in the region of elastic deformation if the measured fluid pressure exceeds a maximum limit, and continues to operate normally without failure due to deformation if the pressure returns to normal.

The small-sized pressure annunciator of the diaphragm capsule diaphragm can well overcome the problems, and the mechanical pressure annunciator has stable working state, small influence degree by environmental factors and high reliability in severe environment. The high-speed rail train and automation line and fields such as nuclear power can be promoted to the later stage and use, and pressure signal ware experiences the change of being surveyed medium pressure, and the switch combination takes place the conversion under specific pressure state, signals, makes things convenient for the controller to do processing on next step, and application prospect is broad in intelligent and professional machinery.

The sensor mechanism mainly senses the change of a certain medium in the environment and converts the change into a measurable physical quantity, after a diaphragm box diaphragm in the sensor senses the pressure of the medium, the diaphragm box diaphragm deforms to obtain corresponding displacement, the ejector rod is pushed to displace, the ejector rod then pushes the spring piece, the spring piece is subjected to reinforcing ribs and special treatment, the rigidity of the rear half section is good, the deformation is not easy to generate, the elasticity of the front half section is good, the recovery capability is strong, the lever effect is also achieved, the displacement is amplified, the contact of the micro switch has enough working displacement, the micro switch generates on-off signals, and the signals are transmitted to a superior system through the socket.

In order to realize better the utility model discloses, furtherly, the switch combination includes spring leaf, micro-gap switch, switch seat, the switch seat is fixed to be set up inside the shell, and is provided with micro-gap switch, spring leaf horizontal installation is in the bottom of switch seat, the top of spring leaf is provided with micro-gap switch's contact, and the bottom is provided with the ejector pin.

The switch base is fixed in a mode of meshing upper and lower threads on the anti-loosening measure of the threads, and is fixed through thread glue coating, so that the fastening reliability of the switch base is guaranteed.

In order to better realize the utility model, furthermore, the front section of the spring piece is provided with a reinforcing rib, and the rear section is of an elastic structure; the rear section of the spring piece is connected with the switch base.

The rigidity of the spring piece is guaranteed through the reinforcing ribs in the first half section, the lever effect is achieved, the micro displacement is amplified by about 1.5 times, and the spring piece has good elasticity in the second half section, so that the ejector rod and the contact of the pressure switch can be guaranteed to be respectively restored to the initial positions. In the heat treatment and strengthening processes, severe plastic deformation can not be generated under the overload condition; under the condition of uneven stress, the conditions of instability and bending are avoided.

In order to realize better the utility model discloses, furtherly, parallelly connected two micro-gap switches that are provided with on the switch seat, micro-gap switch passes through the wire and is connected with the socket, the wire passes through the hook welding mode welding with micro-gap switch. The two micro switches are fixed through screws and are in a parallel state, and in work, any switch can output signals, and the sensor can work normally. The microswitch is connected with the connector in a parallel mode through a wire and is welded and fixed, and in the using process, the initial condition of the switch is under a normally open condition, so that an effective signal can be sent only by one switch working normally, and the reliability of the product is improved. The adopted switch is in a double-margin design, and the reliability of a sensor product is improved in the using process. If the switch is periodically overhauled, the damaged switch can be timely replaced and maintained, and the use reliability and stability of the product are further ensured.

In order to realize better the utility model discloses, furtherly, the spring leaf is T type structure, the spring leaf corresponds micro-gap switch and is provided with horizontal end.

In order to better realize the utility model discloses, furtherly, the pressure capsule and filler neck welded connection, the filler neck passes through the nut to be fixed on the shell.

In order to better realize the utility model discloses, further, still include the lid, the socket sets up on the lid, the socket is mistake proofing formula installation socket.

In order to better realize the utility model discloses, further, filler neck inside is provided with the buffer. The buffer is prior art, and is not the main improvement point of the utility model, so no longer repeated. The filler neck adopts the buffer design, guarantees to test the influence of the pulsation circulation that is produced by the transmission fluid of the gear pump, guarantees the precision of test. Be provided with the sealing washer on the lid, have dustproof and waterproof effect in operational environment, guarantee can normally work in adverse circumstances, improve the adaptability of product.

In the use process of the utility model, the fluid pressure to be measured introduced through the filler neck enters the pressure diaphragm box after passing through the buffer, the pressure signal is converted into a mechanical displacement signal, and then the small displacement signal is transmitted to the spring piece through the ejector rod; when the spring leaf senses the micro displacement variation from the ejector rod, the front section reinforcing part amplifies the displacement by about 1.5 times through a lever principle, the amplified displacement drives the contacts of the two micro switches on the switch support, the pressure signal is converted into an electric signal after the action displacement is reached, and if the action displacement is continuously increased, the stopper can prevent the continuous deformation; if the pressure is reduced, the spring piece resets the mandril again so as to return to the initial position. The two normally open micro switches are connected in parallel, and under the drive of displacement, only any micro switch needs to act to generate a signal. And finally, leading out the effective signal through a connector of the mistake-proofing installation socket and outputting the effective signal to the control equipment. The novel reliability that has of this use is high, and is longe-lived, and later maintenance is convenient with the maintenance, has high temperature and high pressure resistant simultaneously and has the environment of radiation, also can normally work in damp and hot and the higher environment of salinity content, has strong adaptability, characteristics such as simple to operate.

The sensitive element is provided with corresponding displacement amount by metal deformation and is generated by elastic deformation, so that the sensitive element has long service life in the use process, can stably work for a long time within the fatigue limit strength range and normally work under severe conditions. Under the condition of high temperature, the electronic sensor is easy to age and lose effectiveness, and the product is easy to be unstable or can not be used directly, for example, in the field of engines, under the condition of high temperature and high pressure for a long time, the electronic product in the sensor has very high load, and a purely mechanical annunciator has more obvious temperature adaptability advantage. In the maintenance process of the sensor, the failure of the single switch cannot be controlled, the single switch has the sudden property, particularly the single switch is easy to occur in the severe environment, and the situation of the sudden failure occurring in the use process can be solved from the source by adopting the double micro switches at present. The utility model discloses having carried out two margin designs, guaranteeing to adopt two micro-gap switches at the in-process crowning reliability especially, under the condition that a switch became invalid, another switch can normally work, just can not influence the signal output of sensor, guarantees the reliability of product work.

The utility model has the advantages that:

(1) the utility model discloses mainly used requires very high in the engine field and the reliability of high temperature to among the abominable automatic industrial system of operating mode environment, carry out monitor control to system medium pressure.

(2) The utility model discloses a reliability is high, adopts the micro-gap switch of two high reliabilities to on being connected to the socket with the wire, two micro-gap switches are in the parallel connection state, and in operation, as long as one of them micro-gap switch normally works can guarantee the normal output of signal, and signal sensor normally works, improves the reliability of product.

(3) The utility model provides high anti electric power, in the operational environment of heavy current, electric arc appears in the micro-gap switch easily, and electric arc occasionally leads to the direct condition of failure to appear of sensor with the condition that micro-gap switch ablates, now through two micro-gap switches, can continue normal work under the condition of a failure, guarantees the reliability of product.

(4) The utility model discloses have certain fault-tolerant design, in the later maintenance in-process of sensor, the sensor that change or maintenance micro-gap switch became invalid that can be timely guarantees that the product is in normal operating condition for a long time, guarantees the safety of important equipment operation.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a pressure signal;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic diagram of the internal structure of a pressure signal;

FIG. 4 is a schematic view of a connection structure of the micro switch;

FIG. 5 is a schematic view of a spring plate;

FIG. 6 is a schematic structural diagram of a switch base;

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a left side view of FIG. 6;

FIG. 9 is a bottom view of FIG. 6;

FIG. 10 is a schematic diagram of the sensor mechanism;

fig. 11 is a schematic view of the internal structure of the sensor mechanism.

Wherein: 1. the automatic water tap comprises a socket, 2 parts of a sensor mechanism, 3 parts of a switch seat, 4 parts of a spring piece, 5 parts of a stopper, 6 parts of a push rod, 7 parts of a pressure diaphragm capsule, 8 parts of a buffer, 9 parts of a micro switch, 10 parts of an adjusting gasket, 11 parts of a switch support and 12 parts of a nozzle.

Detailed Description

Example 1:

a high-reliability double-margin pressure annunciator comprises a shell, wherein a switch combination and a sensor mechanism 2 are sequentially arranged inside the shell from inside to outside, and a socket 1 is arranged on the outer side of the shell, as shown in figures 1-3 and 11; as shown in fig. 11, the sensor mechanism 2 includes a stopper 5, a push rod 6, a pressure diaphragm box 7, and a filler neck 12, which are sequentially arranged from inside to outside, one end of the push rod 6 slides through the stopper 5 and is connected with a switch assembly, the pressure diaphragm box 7 is connected with the switch assembly through the push rod 6, and two microswitches arranged in parallel are arranged in the switch assembly.

The measured medium enters the pressure diaphragm box 7 through the filler neck 12, the diaphragm box deforms and expands under stress to generate axial displacement, meanwhile, in order to prevent the overpressure deformation damage of the pressure diaphragm box 7 caused by overlarge medium pressure, the stopper 5 is arranged in the displacement direction of the pressure diaphragm box 7, and when the pressure diaphragm box 7 expands to a certain degree, the stopper 5 limits the pressure diaphragm box 7 to move continuously, so that the protection effect is achieved, the sensor is ensured not to fail under the overload condition, and the mistake-proof design and the reliability are enhanced.

Example 2:

the embodiment is optimized on the basis of embodiment 1, as shown in fig. 3, the switch combination includes a spring plate 4, a micro switch 9, and a switch base 3, the switch base 3 is fixedly disposed inside the housing and provided with the micro switch 9, the spring plate 4 is horizontally mounted at the bottom of the switch base 3, a contact of the micro switch 9 is disposed at the top of the spring plate 4, and a push rod 6 is disposed at the bottom of the spring plate.

The displacement of the diaphragm capsule is transmitted to the spring piece 4 through the ejector rod 6, in the assembling process, the free movement of the ejector rod 6 is guaranteed, the lubricating condition is good, the occurrence of blocking or delaying is not allowed in the displacement transmission process, meanwhile, the adhesion condition cannot occur due to friction after metal, and the reliability of displacement transmission is guaranteed. The displacement of the mandril 6 is contacted with the spring piece 4, the displacement value is transmitted, and the spring piece 4 is ensured to be in the horizontal state and happens to be in the contact position with the contact of the microswitch 9 by adjusting the quantity of the gaskets 10 in the assembling process.

Further, as shown in fig. 5 and 9, the front section of the spring plate 4 is provided with a reinforcing rib, and the rear section is of an elastic structure; the rear section of the spring piece 4 is connected with the switch base 3.

The front section of the spring piece 4 is a plane connected by two reinforcing ribs, the bending deformation is small in the action process, and the spring piece is designed into a lever principle, amplifies a signal transmitted by the ejector rod 6 and keeps the original linear characteristic; the spring piece 4 (the second half part of the spring piece belongs to a deformation area in the using process, elastic deformation is generated, and after action, restoring force is generated, so that the ejector rod 6 is pushed back to the original position, and meanwhile, the contact of the micro switch 9 is released.

Further, as shown in fig. 4, 6-8, a switch support 11 is arranged on the switch base 3, micro switches 9 are respectively arranged on two sides of the switch support 11, the two micro switches 9 are arranged in parallel, the micro switches 9 are connected with the socket 1 through wires, and the wires are welded with the micro switches 9 through a hook welding method.

The micro switch 9 adopts two switches with high reliability, and the two switches are connected in parallel and work simultaneously, so that the normal output of signals can be ensured as long as one micro switch 9 works normally, and the annunciator works normally. The microswitch 9 is then wired to the socket 1.

Two micro switches 9 are arranged on the switch base 3 and connected in parallel, and when one switch fails, the other switch can work normally, so that the reliability of the annunciator is increased by times. During high-current operation, because electric arcs are easy to generate during switching, electric shock is ablated, and the reliability of a double-margin switch (double-margin) annunciator is obviously enhanced.

Other parts of this embodiment are the same as embodiment 1, and thus are not described again.

Example 3:

the embodiment is optimized on the basis of embodiment 1 or 2, the pressure bellows 7 is connected with the filler neck 12 in a welding way, and the filler neck 12 is fixed on the shell through a nut as shown in fig. 10.

Further, as shown in fig. 1-3, the socket 1 is disposed on the cover, and the socket 1 is a mistake-proof mounting socket 1.

Further, as shown in fig. 11, a damper 8 is provided inside the filler neck 12.

The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.

Example 4:

a high-reliability double-margin pressure annunciator is shown in figures 1-11, belongs to the field of aerospace and nuclear power related sensors, and particularly relates to a signal measuring device in automatic control, which is a sensor for converting a physical state in an environment into a switching electric signal. As shown in fig. 1-2, comprises a sensor mechanism 2, a switch combination, a cover and a socket 1, and as shown in fig. 3 and 11, the sensor comprises a stopper 5, a push rod 6, a pressure film box 7 and a filler neck 12. The displacement of the bellows is transmitted to the switch assembly by the push rod 6.

The diaphragm membrane is introduced into a pressure medium to be tested through the connecting pipe mouth 12, so that the elastic element diaphragm box is stressed and expanded to generate axial displacement, meanwhile, in order to prevent the overpressure deformation damage of the pressure diaphragm box 7 caused by overlarge medium pressure, the stop dog 5 is arranged in the displacement direction of the pressure diaphragm box 7, when the pressure diaphragm box 7 expands to a certain degree, the stop dog 5 limits the pressure diaphragm box 7 to continue moving, thereby playing a protection role, ensuring that a sensor cannot fail under an overload condition, and strengthening the mistake-proof design and the reliability.

Further, as shown in fig. 3, 7-9, the switch combination includes a spring plate 4, a micro switch 9, and a switch base 3.

The displacement of the diaphragm capsule is transmitted to the spring piece 4 through the ejector rod 6, in the assembling process, the free movement of the ejector rod 6 is guaranteed, the lubricating condition is good, the occurrence of blocking or delaying is not allowed in the displacement transmission process, meanwhile, the adhesion condition cannot occur due to friction after metal, and the reliability of displacement transmission is guaranteed. The displacement of the mandril 6 is contacted with the spring piece 4, the displacement value is transmitted, and the spring piece 4 (in the assembling process, the quantity of the gaskets 10 is regulated to ensure that the spring piece 4 is in the horizontal state and happens to be in the position contacted with the contact of the microswitch 9).

Further, as shown in fig. 5, the front section of the spring plate 4 is provided with a reinforcing rib, and the rear section is of an elastic structure; the rear section of the spring piece 4 is connected with the switch base 3.

The front section of the spring piece 4 is a plane connected by two reinforcing ribs, the bending deformation is small in the action process, and the spring piece is designed into a lever principle, amplifies a signal transmitted by the ejector rod 6 and keeps the original linear characteristic; the spring piece 4 (the second half part of the spring piece belongs to a deformation area in the using process, elastic deformation is generated, and after action, restoring force is generated, so that the ejector rod 6 is pushed back to the original position, and meanwhile, the contact of the micro switch 9 is released.

Further, as shown in fig. 6, the micro switch 9 adopts two switches with high reliability, and the two switches are connected in parallel and work simultaneously, so that the normal output of the signal and the normal operation of the annunciator can be ensured as long as one micro switch 9 works normally. The microswitch 9 is then wired to the socket 1.

The utility model discloses in the use, assembly is received sensilla mechanism 2: firstly, welding an upper common membrane and a lower common membrane into a membrane box, welding the membrane box and the filler neck 12 together, and carrying out air tightness test to ensure good air tightness. The bellows connecting nozzle 12 is fixed on the housing by a nut, then the stopper 5 is assembled, and the position of the stopper 5 is adjusted, so that the bellows can be normally deformed within the working pressure range, can be effectively stopped before plastic deformation occurs, and can be prevented from permanent deformation.

Assembling the switch base 3: firstly, the spring piece 4 is checked to be free of damage and deformation, the micro switch 9 works smoothly, all components are assembled according to the figure, the spring piece 4 (in a horizontal position; no pre-pressure exists at an action contact of the micro switch 9) is ensured by installing the quantity of the adjusting gaskets 10, the spring piece 4 (in the horizontal position, a lead is welded with the two micro switches 9 in a hook welding mode by installing the quantity of the adjusting gaskets 10 in the assembling process, and safety and reliability under the working condition of the vibration process are ensured.

Final assembly debugging: the inner cavity of the sensor is cleaned before assembly, and when the ejector rod 6 is placed into the sensor mechanism 2, the ejector rod 6 is required to freely and smoothly move up and down. In the twist shell of switch seat 3, make product property error satisfy the requirements through the position of adjusting switch seat 3, should guarantee that two micro-gap switch 9 performances are unanimous, screw up locking screw at last, for further preventing that switch seat 3 is not hard up in the use and leads to the product error to change simultaneously, scribble screw thread fastening and glue in screw thread department before the assembly. Finally, the cover combination of the annunciator and the socket 1 are installed in place.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims (8)

1. A high-reliability double-margin pressure annunciator is characterized by comprising a shell, wherein a switch combination and a sensor mechanism (2) are sequentially arranged inside the shell from inside to outside, and a socket (1) is arranged on the outer side of the shell; the sensor mechanism (2) comprises a stopper (5), a push rod (6), a pressure diaphragm box (7) and a filler neck (12) which are sequentially arranged from inside to outside, one end of the push rod (6) penetrates through the stopper (5) in a sliding mode and is connected with a switch combination, and the pressure diaphragm box (7) is connected with the switch combination through the push rod (6); two micro switches (9) which are arranged in parallel are arranged in the switch combination.

2. The high-reliability double-margin pressure annunciator according to claim 1, wherein the switch combination comprises a spring piece (4), a microswitch (9) and a switch base (3), the switch base (3) is fixedly arranged inside the shell and is provided with the microswitch (9), the spring piece (4) is horizontally arranged at the bottom of the switch base (3), the top of the spring piece (4) is provided with a contact of the microswitch (9), and the bottom is provided with a mandril (6).

3. The high-reliability double-margin pressure annunciator as claimed in claim 2, wherein the front section of the spring plate (4) is provided with a reinforcing rib, and the rear section is of an elastic structure; the rear section of the spring piece (4) is connected with the switch base (3).

4. A high reliability dual margin pressure annunciator as claimed in claim 2, wherein the micro switch (9) is connected to the socket (1) by a wire, and the wire is welded to the micro switch (9) by means of hook welding.

5. A high reliability dual margin pressure annunciator as claimed in claim 4, wherein the spring plate (4) is of T-shaped structure, and the spring plate (4) is provided with a transverse end corresponding to the microswitch (9).

6. A high reliability dual margin pressure annunciator as claimed in claim 1, wherein the pressure bellows (7) is welded to the filler neck (12), and the filler neck (12) is fixed to the housing by means of a nut.

7. A high reliability dual margin pressure annunciator as claimed in claim 1 further comprising a cover, wherein the receptacle (1) is disposed on the cover, and wherein the receptacle (1) is a mistake-proof mounting receptacle (1).

8. A highly reliable dual margin pressure annunciator as claimed in claim 1, wherein the filler neck (12) is internally provided with a buffer (8).

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