Inertia switch

FIELD: measurement equipment.

SUBSTANCE: invention is aimed at measurement of applied linear accelerations in the automatic systems of flying objects. An inertia switch comprises the following units set on the axis: a basic inertia block held by a magnetic system, and a movable rotary drive with a groove in the side wall and a bridging unit set on it and intended for switching of contacts of the contact system, a casing with a sloped groove with its angular length exceeding the angular length of the groove in the movable rotary drive by the angle sufficient for contact switching, two projections set diametrically on an additional inertia block made as a bush interacting with the casing groove and the movable rotary drive groove, the bush is mounted on the basic inertia block and is pressed by a spring in the axial direction with the possibility of mutual axial movement, the axial stroke of the basic inertia block in respect to the bush is not less than its possible axial stroke up to full stop, the force produced by the spring exceeds the force produced by the basic inertia block at the operating acceleration set point for which the inertia switch is adjusted, and the diametrical projections are fixed on the bush, the prominent inner ends of the projections are inserted in the circular grooving made on the basic inertia block.

EFFECT: increased resistance of an inertia switch to highly intensive load impacts and expanded application range.

5 dwg

The invention is intended to measure the effective linear accelerations in the automation systems of flying objects.

Currently known various constructions of the inertial switches, but all they possess certain disadvantages, do not perform in fully staged invention tasks.

Known inertia-switch triggered by the boundary value of acceleration, comprising a housing, an inertial body, held by the magnetic system, contacts [No. EP 708467 A1, NN 35/14, 1995].

The inertial body of the switch is not damped, so it would not be appropriate for operation under the action of vibration, especially in cases where the amplitude of vibration impacts commensurate with setpoint - edge acceleration trigger on the configured switch.

The main disadvantage is that it limits the field of application of the known switch.

Known inertia switch, comprising a housing, an inertial body, held by the magnetic system, the contacts and the movable rotary actuator contacts. Housing and actuator are coaxially aligned with the inertial body and have side walls sloping grooves for engagement with the radial projections of the inertial body [RF patent №2192683, H01H 35/14, published 10.11.2002].

Know the fair inertia switch does not provide its functionality during and after high-intensity shock, as the radial projections of shear and bending at the same time, even when executed from high-strength materials can deteriorate. That is, the field of application of such inertia switch limited.

Known inertia switch, comprising a housing, the contact system, installed on the main axis of the inertial body, held by the magnetic system, and the movable rotary actuator with a groove in the side wall and posted on Paramakatoi for switch contacts, and the body is made with a sloped groove with an angular extent greater than the angular length of the groove in the movable rotary actuator by an angle sufficient to switch contacts, and the oblique groove of the housing and the rolling groove of the rotary actuator cooperating diametrically spaced projections [RF patent №2193800, H01H 35/14, published 27.11.2002].

Known inertial switch as well as the previous does not provide a high resistance to high-intensity shock.

This inertial switch is considered as a prototype.

The problem to which the invention is directed, is the creation of the inertial switch operable during and after exposure to high-intensity shock accelerations.

The technical result to be obtained by use of the invention is to increase stand the STI inertial switch to the high-intensity shock and the expansion of its applications

This technical result is achieved by the fact that the inertia switch, comprising a housing, the contact system, installed on the main axis of the inertial body, held by the magnetic system, and the movable rotary actuator with a groove in the side wall and placed on perimieter for switch contacts, and the body is made with a sloped groove with an angular extent greater than the angular length of the groove in the movable rotary actuator by an angle sufficient to switch contacts, and the oblique groove of the housing and the rolling groove of the rotary actuator cooperating diametrically spaced projections, according to the invention provided with an additional inertial body is a sleeve that is installed on the main inertial body and bogatoi in the axial direction by a spring, with the possibility of mutual axial movement, while the axial stroke of the main inertia of the body relative to the sleeve not less than its possible axial stroke to another, and the force created by the spring exceeds the force generated by the primary inertial body under the action of setting the value of acceleration is set to the inertia switch, and the diametrical protrusions mounted on the sleeve, with their protruding inner ends come in an annular groove made on the primary inertial body.

The rst is the group in the design of the inertial switch additional inertial body - bushing mounted on the main inertial body and bogatoi in the axial direction by a spring, with the possibility of mutual axial movement, with the provision of the axial stroke of the main inertia of the body relative to the sleeve not less possible axial stroke to another, and ensuring that excess force generated by the spring force generated by the inertial body under the action of setting the value of acceleration is set to the inertia switch, and the fixing protrusions diametrically on the sleeve, into their protruding inner end in an annular groove made on the primary inertial body, allows you to "unload" radial protrusions with high-intensity shock stress. The main inertial body having a greater mass than the sleeve, moving in the axial direction with high-intensity shock stress to another, "not involved" in creating the loading on radial projections, the latter are impacted only by the spring force and the inertial force of the sleeve. That is, the strength of the inertial switch to the high-intensity shock is considerably increased.

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

New signs, which contains a distinctive part of f is rmula of the invention, not identified in the technical solutions of similar purpose. On this basis, we can conclude that the compliance of the claimed invention, the term "inventive step".

The invention is illustrated in the drawings.

Figure 1 shows a longitudinal section of the inertial switch is in its original state.

Figure 2 - cross section a-a in figure 1 (the contacts in the initial state).

Figure 3 - the shape of the groove in the body.

Figure 4 - the shape of the groove in the movable drive pin system.

Figure 5 is a longitudinal section of the inertial switch (position of the inertial bodies under the action of high-intensity short duration accelerations.

The inertial switch includes a casing 1 in which is placed a casing 2 with a sloped groove 3 and the opposite window 4 on the side wall, in which are the bearings 5 mounted on diametrically ledges 6, mounted on the additional inertial body, the sleeve 7 that is installed on the primary inertial body 8, which, in turn, mounted on the axle 9, equipped with ball bearings 10. The sleeve 7 is pretensioned by the wear spring 11. The relative movement between the primary inertial body 8 and the sleeve 7 limit protruding inner ends 12 diametral protrusions 6, included in the annular groove 13 of the main inertial body 8.

The weight of the additional inertial body sleeve 7 is considerably less than the inertial mass of the basic body 8.

To reduce friction of the primary inertial body 8 on the axis 9 in the grooves 14 of the primary inertial body 8 is placed balls 15. On the axis 9 is also movable rotary actuator 16 with a groove 17 in the side wall and the window 18. In the groove 17 posted by a ball bearing 5 with the tab 6. On the movable rotary actuator 16 posted perimieter in the form of the Cam 19 to switch contacts 20 that are installed on the current terminals 21, is placed in the circuit Board 22 through insulators 23. The main inertial body 8 is held in the initial position of the magnetic system consisting of a magnet 24, is enshrined in the main inertial body 8, and the adjusting nut 25, which is the anchor of the magnetic system. The casing 1, the casing 2, the main inertial body 8 and the movable rotary actuator 16 is made of nonmagnetic materials.

Axial stroke of the primary inertial body 8 relative to the sleeve 7 is greater than its axial stroke to another end movable in the rotary actuator 16, and the force created by the spring 11 exceeds the force generated by the primary inertial body 8 under the action of setting the value of acceleration is set to the inertia switch (Fig.1-4).

The inertial switch works as follows.

Under the action of acceleration in the axial direction and magnitude smaller setting, the primary inertial body 8 and the sleeve 7 remain in their original position, t is as the force of attraction of the primary inertial body 8 magnetic system exceeds the force acting on the inertial body 7, 8 from acceleration. The inertia switch is not activated (contacts remain in their original state).

Under the action of acceleration with magnitude equal to or greater by a certain amount setting acceleration in the axial direction and the main inertial body 8 together with the sleeve 7 is moved in the opposite direction, simultaneously turning from the interaction of one of the bearing 5 with a sloped groove 3 of the housing 2.

Moving the rotary actuator 16 in the beginning of the movement of the primary inertial body 8 and the sleeve 7 is not rotated. The rotation occurs at the end of the movement of the primary inertial body 8 and the sleeve 7 due to the difference of the angular sizes of the slots 3, 17. Together with a movable rotary actuator 16 rotates the Cam 19 mounted thereon. The Cam 19 closes and interrupts the corresponding contacts 20. The angular extent of the groove 3 exceeds the angular length of the groove 17 on the magnitude of the angle of rotation of the Cam 19 to switch contacts 20.

After termination of the acceleration of the magnetic system returns the primary inertial body 8 with the sleeve 7 in its original state, with the contacts 20, interacting with the Cam 19 also accept original state.

Under the action of an acceleration value, significantly more settings in the axial direction and (5), the main in scienoe body 8 is moved in the opposite direction until it stops, compressing the spring 11. When this sleeve 7 with a delay relative to the main inertial body 8 begins to move in the axial direction, while turning from the interaction of one of the bearing 5 with a sloped groove 3 of the housing 2. When the translational-rotational motion of the sleeve 7 at the end of its stroke, the second ball bearing 5 communicates with the groove 17 of the rolling of the rotary actuator 16 and rotates it, switching Cam 19 contacts 20. In this mode of operation of the inertial switch (under the action of high accelerations) of the ball 5 and the diametrical projections 6 will be loaded only by the force of the spring 11 and the inertial force of the sleeve 7, it is not destroyed.

When action in the direction of a high-intensity shock accelerations of short duration sleeve 7 does not have time to move from the initial position or shifted by a small distance, and then returns back without switching Cam 19 contacts 20, as the inertial body 8, not directly connected with a movable rotary actuator 16, after the termination of the shock acceleration time to return back to its original position.

Under the action of linear and vibration accelerations in the lateral direction due to the use of ball bearings, providing small coefficients of friction, their effect is on the tolerance of the inertia switch will be insignificant. The use of ball bearings also allows for the configuration of the inertial switch on the small acceleration operation.

Adjusting the acceleration operation of the inertial switch is an adjusting nut 25, is made of magnetic material.

Thus, the application stated the inertia switch will allow to increase its resistance to high-intensity shock accelerations, that is, to remove restrictions on current linear accelerations that will significantly expand the potential scope of its application.

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

the tool embodying the claimed invention in its implementation, is intended for use in industry, namely to measure the effective linear accelerations in the automation systems of flying objects;

for the claimed device in the form in which it is described in the claim, confirmed the possibility of its implementation;

- a means of embodying the invention in its implementation, is capable of increasing the resistance of the inertial switch to the high-intensity shock and to extend its application scope.

Therefore, tawlae the second invention meets the condition of "industrial applicability".

Inertia switch, comprising a housing, the contact system, installed on the main axis of the inertial body, held by the magnetic system, and the movable rotary actuator with a groove in the side wall and placed on perimieter for switch contacts, and the body is made with a sloped groove with an angular extent greater than the angular length of the groove in the movable rotary actuator by an angle sufficient to switch contacts, and the oblique groove of the housing and the rolling groove of the rotary actuator cooperating diametrically spaced projections, characterized in that it is provided with an additional inertial body is a sleeve that is installed on the main inertial body and bogatoi in the axial the direction of the spring with the possibility of mutual axial movement, while the axial stroke of the main inertia of the body relative to the sleeve not less than its possible axial stroke to another, and the force created by the spring exceeds the force generated by the primary inertial body under the action of setting the value of acceleration is set to the inertia switch, and the diametrical protrusions mounted on the sleeve, with their protruding inner ends come in an annular groove made on the primary inertial body.