Inertia switch. RU patent 2521000.

IPC classes for russian patent Inertia switch. RU patent 2521000. (RU 2521000):

H01H35/14 - Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch

Another patents in same IPC classes:

Inertia switch / 2520596
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FIELD: measurement equipment.

SUBSTANCE: invention is aimed at recording of applied linear accelerations in automatic systems of aircrafts and safety systems of vehicles. An inertia switch comprises a casing, an axial guide, an inertia block with radial projections set on the guide, a drive for contacts, movable rotary bushes set coaxially in each other and in respect to the inertia block which are fitted by inclined grooves in the side walls for the interaction with radial projections of the inertia block at its translational motion. The inclined grooves are inclined to the opposite sides. Permanent magnets are installed on the one of the bushes, and the bushes are made from nonmagnetic metal with high electric conductivity.

EFFECT: improved reliability of inertia switch at the influence of highly intensive impact and vibration accelerations in flight and in case of emergency falls, keeping of the initial position of contacts within the unit where they are installed.

3 cl, 5 dwg

The invention is intended for registration of existing linear accelerations in various aircraft systems.

Currently the most famous different designs inertial switches, but they all have certain drawbacks and does not meet fully supplied invention tasks.

Known inertia switch containing case, axial guide (axis), situated on it, the inertial body with radial ribs and drive contacts.

The body is made obliquely groove interacting with one ledge made by the inertia body, while the other tab on inertial body interacts with the groove in the side wall of the rotary actuator contacts for forward and reverse motion of the inertial body only at the end of his moves. Inertial body charged magnetic system, [RF patent №2193800, NN 35/14 published 27.11.2002].

Known inertia switch might work (to switch your contacts) accidental falls within the project use, such as on soft ground, as his time delay is determined by the slope and angular long slant grooves, is insignificant. That is, the field of application of known inertia switch is limited. For example, it is impractical to use as a safety switching devices in systems of explosive objects.

Known inertia switch containing case, axial guide (axis), situated on it, the inertial body with radial ribs and drive contacts.

Inertia switch contains fixed the guide and mobile rotary actuator contacts, located coaxially with the inertial body and having on the sides slanted grooves for interaction with radial projections inertia of the body, which is charged magnetic system, [RF patent №2192683, NN 35/14 published 10.11.2002].

Known inertia switch efficient at and after exposure to high-intensity shock and vibration acceleration in flight in the composition of the object's use, but it can also work to switch its contacts) accidental falls within the project use, such as on soft ground, i.e. it cannot be used as a safety switching devices in systems of explosive objects.

This inertia switch is seen as a prototype.

The challenge, which is aimed invention - creation of inertia switch reliable during and after exposure to high-intensity shock and vibration acceleration in flight in the composition of the object use and is not triggered when the emergency shock stress.

The technical result obtained from the use of the invention is increasing the reliability of the inertial switch under the action of high-intensity shock and vibration acceleration in flight and preserve the original state of the contacts with emergency lows in the composition of the object use.

This technical result is achieved by inertia switch containing case, axial guide, located on it inertial body with radial ribs and drive contacts, according to the invention equipped with mounted axial guidance and centrally located in each other and relative to the inertial body, internal and external moving rotary bushings with inclined slots on the sides to interact with radial ribs, drive contacts made in the form of rods, fixed in the hole axial guidance and associated with the inertia body, with slanted grooves bushings made the slope on the opposite side, and on one of the plugs installed permanent magnets and sleeves made of non-magnetic metal with high electric conductivity.

The introduction of the inertia switch is centrally located in each other and relative to the inertial body, bogatogo spring, moving rotary bushings with inclined slots on the sides to interact with radial projections inertia of the body with its progressive move and perform angle grooves with a slope in the opposite side with one of the sleeves of permanent magnets and implementation of sleeves from nonmagnetic metal with high electrical conductivity, as well as the implementation of a drive of contacts in the form of rods, fixed in the hole axial guidance and associated with the inertia of a body, allows to realize in inertial switch effective induction brake without the use of gears. That, ultimately, allows selection of accelerations acting in the direction of operation not only in size, but in duration, i.e. excludes triggering the inertia switch with emergency shock stress and provides reliable actuation trajectory in the composition of the object use. The effectiveness of the induction brake is ensured by the fact that, because of the tilt of the slots on the hubs in different directions, bushings with directional movement inertia of a body under the action of accelerated rotate in different directions, providing double the bandwidth of relative angular velocity of one sleeve relative to another. The implementation of the sleeves of nonmagnetic metal with high electrical conductivity increases the efficiency of induction brake, since it excludes parasitic bypass magnetic flux magnets and adequate vortex (induction) currents.

Inertia switch is also equipped with an additional permanent magnets, installed in the outer rolling rotary sleeve and casing is made of non-magnetic metal with a high electrical conductivity, which also increases the efficiency of induction brake.

In addition, the inertia switch is equipped with a spring, one end of which depends on the inertial body, and the other at close range axial guidance.

Preload inertial body spring provides increased stroke inertia of the body, which in turn increases the resistance of inertia switch to shock and vibration.

The presence in the invention of characteristics that distinguish it from the prototype, can be considered a relevant condition "novelty".

New signs, which contains the distinctive part of the claims that have not been identified in the technical solutions of similar purpose. On this basis it is possible to draw a conclusion on the compliance of the claimed invention, the condition of "inventive step".

The invention is illustrated by drawings.

Figure 1 shows a longitudinal section of the inertia switch is in the initial state.

Figure 2 - form inclined groove in the outer sleeve.

Figure 3 - form inclined slot in the inner sleeve.

Figure 4 - design induction brake.

Figure 5 - a longitudinal section of the inertia switch with the additional magnets on the outer sleeve.

Inertia switch contains a body 1, which establishes the axial guide 2, which is installed on the balls 3 inertial body 4. The 3 balls placed in the annular grooves 5 inertial body 4. On 2 axial guidance on the ball 6 coaxiale set of external and internal thin-walled sleeve 7 and 8, respectively. Bush 8 covers inertial body 4. On the side walls of the sleeves 7 and 8 are slanted grooves 9 and 10, respectively, interacting through ball with 11 diametrically located radial lugs 12 inertial body 4. Ball 11 installed on the tabs 12 to reduce friction. Slots 9, 10 tilted in different directions (one is executed on the left, the other on the right spiral) (Fig.1-3).

On the inner sleeve 8 evenly spaced around the circumference with alternating poles attached (glued or welded) permanent magnets 13 in the sectors covered by a pole of surface and one of the side surfaces of the outer sleeve 7 for maximum energy use magnets 13. Sleeve 7 and 8 are made of non-magnetic metal with high electric conductivity. Permanent magnets 13 and plug sleeve form 7 induction brake of inertial switch (figure 4).

Permanent magnets 13 can be located on the outer sleeve 7, the permanent magnets 13 and plug sleeve form 8 induction brake of inertial switch.

Inertial body 4 held in the initial position by spring 14, the end of which is based on the emphasis 15, fixed at 2 axial guidance. In the hole 2 axial guidance placed the stem 16, by means of pin 17 is associated with the inertia body 4 in the axial direction. Pin 17, established in diametrically hole stem 16, their ends enters the ring groove 18 inertial body 4. On sleeves 7, 8, made grooves 19, 20 for interoperability one of ball bearings 11 only with angled groove 9 sleeve 7, and the other only with angled groove 10 sleeve 8 (Fig.1-3).

Rod 16, moving together with the inertial body 4, switch of contact system (not shown), that is, a drive of the contact system.

When the effects of acceleration and with a value equal to or greater settings, in the axial direction for a long time inertial body 4 moves in the opposite direction, compressing the spring 14 and at the same time turning (from the interaction installed on radial tabs 12 ball bearings 11 with the slots 9, 10) sleeve 7, 8. Sleeve 7, 8 due to the opposite slope of the slots 9, 10 rotated in opposite directions with the angular velocity Ω 1 and Ω 2, respectively, that is, the relative angular velocity of the sleeves 7, 8 sum of the angular velocities of each (W Rel =Ω 1 +Ω 2 ). Vortex induced current, emerging in the bushing material 7, create a holding torque is relative rotation of the sleeves 7, 8. The value of the braking torque depends on the relative values of the angular velocity (W Rel ) bushings 6, 7, which also depends on the value of the current acceleration and. That is, it leads to development of temporary delay inertia switch is determined by the magnitude and duration of the acceleration.

Vortex induced current, emerging in housing material 1, also create a holding torque of turning sleeve 7.

Moving inertial body 4 to lock in the opposite direction of the current acceleration and moves stem 16, calling switch of contact system (not shown).

When the effects of acceleration and a less efforts initial preload spring 14, inertial body 4 remains in its original position, because the force of the spring 14 exceeds the force acting on inertial body 4 from acceleration and.

When the effects of acceleration and magnitude greater efforts initial preload spring 14, but the smaller settings, inertial body 4 is displaced from its original position, compressing the spring 14, by some stroke, insufficient to trigger the inertia switch.

When acting in the direction of operation of high-intensity shock accelerations of a small time inertial body 4, interacting with sleeves 7, 8, due to a sharp increase in braking torque in the induction brake is no time to be displaced from its original position or, shifted slightly, again comes back. That is the stem 16 also moves at a distance, causing the switch of contact system.

When braking in the induction brake, consisting of permanent magnets 13 and sleeve 7, occurs because the guidance in the hub 7 induction of currents in mutual rotating permanent magnets 13 and sleeve 7.

Under the action of linear and vibration accelerations in the lateral direction for using roller and ball bearings, which provides small coefficients of friction, their impact on the tolerance of the inertia switch will be insignificant. The use of ball and ball bearings also allows for setting the inertia switch on small speed up the operation.

Adjusting settings acceleration trigger inertia switch is the selection of the spring 14 or can be installed at one of the ends of the spring 14 strips (not shown).

Instead of springs 14 to hold inertial body 4 can be used magnetic system, but preload inertial body spring provides increased stroke inertia of the body, which in turn increases the resistance of inertia switch to shock and vibration.

Thus, application of the claimed inertia switch will allow to ensure reliable operation under the action of high-intensity shock and vibration accelerations and preserve the original state of the contacts with emergency lows in the composition of the object, i.e. will significantly expand the possible areas of its application.

The data presented indicate the implementation of the use of the claimed invention, the following cumulative conditions:

- the means of embodying the claimed invention in its implementation, approved for use in industry, namely to register existing linear accelerations in various systems of aircrafts;

- for the claimed device (inertia switch) in the form in which it is described in the independent claim of the invention, confirmed the possibility of its implementation;

- a means of embodying the claimed invention, it is able to guarantee reliable performance under the action of high-intensity shock and vibration accelerations and preserve the original state of the contacts with emergency lows in the composition of the object use.

Therefore, the claimed invention meets the condition of "industrial applicability".