Fire work actuating device based on Tesla valve

Abstract

The invention discloses an ignition actuating device based on a Tesla valve, the Tesla valve without a movable part is applied to the ignition actuating device, and through the combined action of the Tesla valve and a throttler, the fuel gas pressure of the ignition actuating device under the complex load condition is rapidly and dynamically adjusted. Therefore, movement and power meeting the requirements are output within the specified time, meanwhile, in-place impact is effectively reduced, and the impact influence on the aircraft is greatly reduced. The novel pyrotechnic actuating device has the advantages of being simple in structure, high in reliability and small in pyrotechnic impact.

Description

Technical Field

[0001] The invention belongs to the technical field of pyrotechnics, and in particular relates to a pyrotechnic actuating device based on a Tesla valve. Background Art

[0002] As the driving source of the one-time working folding and unfolding mechanism, the pyrotechnic actuator uses the high-temperature and high-pressure gas generated by the combustion of gunpowder to drive the piston to move, output motion and power that meet the requirements, and transmits the motion and power to the actuator through the transmission device, thereby realizing the expected functions and actions of the actuator.

[0003] The output characteristics of the pyrotechnic actuator play a key role in the success or failure of the aircraft's mission, and have extremely high reliability and safety requirements. With the development of modern aircraft towards high speed, high maneuverability and intelligence, the requirements for the working time and impact of the pyrotechnic actuator are further improved. Specifically, under the boundary conditions of two large loads, the working time of the pyrotechnic actuator is shortened from hundreds of milliseconds to tens of milliseconds, and at the same time, the impact of ...

[0004] In order to meet the working time requirements under complex load conditions, the existing fire-driven actuators usually increase the output force design margin, which inevitably produces a large impact on the impact. Therefore, in order to meet the requirements of short working time and low impact on the impact at the same time, it is necessary to develop a new fire-driven actuator. Summary of the invention

[0005] In view of this, the present invention provides a new type of fire-operated actuator based on the Tesla valve, which can output the required motion and power under large and complex load conditions, meet the requirements of reliability and safety, working time, and impact in place, and realize the rapid start-up and end buffering of the actuator of the aircraft folding and unfolding mechanism, ensuring that the actuator is deployed in place within the specified time and will not affect the normal operation of the aircraft.

[0006] A fire-operated device based on a Tesla valve comprises an electric igniter 1, gunpowder 2, a Tesla valve 3, a throttle 4, a piston rod 5 and a cylinder 6, wherein the electric igniter 1 is fixed at the front end of the cylinder 6; the piston rod 5 is placed in the cylinder 6 and can move axially along the cylinder; the piston rod 5 is a T-shaped structure, comprising a T-head and a tail rod, and the tail rod passes through the bottom end of the cylinder 6; the gunpowder 2 is placed in the cylinder 6, and is located between the electric igniter 1 and the T-head of the piston rod 5; a mounting hole is provided along the axis of the T-head of the piston rod 5, and the mounting hole extends to the tail rod of the piston rod; the Tesla valve 3 is installed in the mounting hole of the T-head of the piston rod 5, and the throttle 4 is installed on the tail rod of the piston rod 5, and is located on the outside of the through hole extending to the tail rod of the piston rod 5.

[0007] Preferably, the central axis of the Tesla valve 3 is arranged to coincide with the central axis of the piston rod 5 ; the central axis of the throttle 4 is arranged to be perpendicular to the central axis of the piston rod 5 .

[0008] Preferably, the Tesla valve 3, the throttle 4 and the piston rod 5 are threadedly connected, and thread sealant is applied to the threaded connection.

[0009] Preferably, according to output requirements and boundary conditions, the unidirectional conductivity through the Tesla valve 3 is enhanced / weakened by increasing / decreasing the number of units of the Tesla valve 3 .

[0010] Preferably, according to output requirements and boundary conditions, the gas flow area of ​​the throttle 4 is increased / decreased by increasing / decreasing the throttle hole diameter and the number of units of the throttle 4, thereby reducing / increasing the gas pressure drop before and after the throttle 4.

[0011] Preferably, the gunpowder 2 is selected from propellant SF-3.

[0012] Preferably, a filter 7 is further included, and the filter 7 is placed at the front end of the Tesla valve 3 .

[0013] Beneficial Effects

[0014] 1. The pyrotechnic actuator of the present invention applies a Tesla valve without moving parts to the pyrotechnic actuator. Through the combined action of the Tesla valve and the throttle, the rapid dynamic adjustment of the gas pressure under complex load conditions of the pyrotechnic actuator is achieved, thereby outputting motion and power that meet the requirements within a specified time, while effectively reducing the impact on the aircraft, and greatly reducing the impact on the aircraft. The new pyrotechnic actuator has the characteristics of simple structure, high reliability and small pyrotechnic impact.

[0015] 2. The layout of Tesla valves and throttles can be selected according to the structural dimensions, process requirements, etc., and can be flexibly configured. The modular Tesla valves and throttles are simple and reliable to install, easy to replace, and convenient for individual and integrated testing of working characteristics, thus improving the development efficiency of fire-actuated actuator products.

[0016] 3. The Tesla valve, throttle and piston rod are sealed by applying thread sealant to ensure that the gas in chamber A and chamber B is connected through the flow channel of Tesla valve 3 and throttle 4.

[0017] 4. According to the output characteristic requirements and load conditions, through the adaptive adjustment of the layout form and characteristic parameters of the Tesla valve and throttle, the serialization and spectrum of the fire-actuated actuator products are realized, and the applicability and versatility of the fire-actuated actuator are improved.

[0018] 5. By selecting propellant SF-3 or installing a filter, the purity of the combustion gas can be ensured to avoid blockage of the flow passages of the Tesla valve and throttle due to excess matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a fire-actuated actuator based on a Tesla valve in an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of a Tesla valve having two unidirectional conduction units in an embodiment of the present invention;

[0021] Figure 3 It is a schematic structural diagram of a fire-operated actuating device based on a Tesla valve including a filter in an embodiment of the present invention;

[0022] Among them: 1-electric ignition device, 2-gunpowder, 3-Tesla valve, 4-throttle, 5-piston rod, 6-cylinder, 7-filter DETAILED DESCRIPTION

[0023] The implementation of the method of the present invention is described below with reference to the accompanying drawings and examples.

[0024] like Figure 1 As shown, an initial locking device for an actuating mechanism, a fire-operated actuating device based on a Tesla valve in this embodiment, comprises an electric igniter 1, gunpowder 2, a Tesla valve 3, a throttle 4, a piston rod 5 and a cylinder 6, wherein the electric igniter 1 is connected to the cylinder 6 by threads; the piston rod 5 is a T-shaped structure, comprising a T-head and a tail rod, and the tail rod passes through the bottom end of the cylinder 6; the gunpowder 2 is placed in the cylinder 6, and is located between the electric igniter 1 and the T-head of the piston rod 5; a mounting hole is provided along the axis of the T-head of the piston rod 5, and the mounting hole extends to the tail rod of the piston rod; the Tesla valve 3 is installed in the mounting hole of the T-head of the piston rod 5, and the throttle 4 is installed on the tail rod of the piston rod 5, and is located on the outside of the through hole extending to the tail rod of the piston rod 5; the T-head of the piston rod 5 divides the cylinder 6 into two left and right cavities, namely, cavity A and cavity B; the electric igniter 1 and gunpowder 2 are both located in cavity A;

[0025] Tesla valve 3 has unidirectional conductivity. After ignition, the gas flows from chamber A to chamber B in a forward direction, and the gas flows from chamber B to chamber A in a reverse direction, that is, the flow resistance of the gas from chamber A to chamber B is smaller than the flow resistance from chamber B to chamber A.

[0026] The arrangement of the Tesla valve 3 on the piston rod 5 can be selected according to the structural dimensions, process requirements, etc. For example, the central axis of the Tesla valve 3 can be coincident with, offset, or inclined with the central axis of the piston rod 5. The arrangement of the throttle 4 on the piston rod 5 can be selected according to the structural dimensions, process requirements, etc. For example, the central axis of the throttle 4 can be perpendicular to or inclined with the central axis of the piston rod 5. Figure 1 It is shown that the central axis of the Tesla valve 3 coincides with the central axis of the piston rod 5 , while the central axis of the throttle 4 is perpendicular to the central axis of the piston rod 5 .

[0027] The threaded connection between the Tesla valve 3, the throttle 4 and the piston rod 5 can be sealed by applying thread sealant, designing a sealing structure, etc., to ensure that the gases in the A chamber and the B chamber are connected through the flow channel of the Tesla valve 3 and the throttle 4.

[0028] By adjusting the characteristic parameters and number of units of Tesla valve 3, the gas flow control through Tesla valve 3 can be achieved. Furthermore, by matching the characteristic parameters and number of units of throttle 4, the dynamic distribution and adjustment of the gas pressures of chambers A and B during operation can be achieved according to the output requirements and boundary conditions, thereby optimizing the output characteristics of the fire-actuated device. Generally speaking, increasing the number of units of Tesla valve 3 can improve its one-way conduction efficiency, thereby significantly increasing the flow resistance of the fire-actuated device from chamber B to chamber A. At the same time, according to the output requirements and boundary conditions, by increasing / decreasing the throttling hole diameter and the number of units of throttle 4, the gas flow area of ​​throttle 4 can be increased / decreased, thereby reducing / increasing the gas pressure drop before and after throttle 4. Figure 2 Shown is a schematic diagram of the Tesla valve structure with two unidirectional conduction units.

[0029] In order to avoid the blockage of the flow passage of Tesla valve 3 and throttle 4 due to excess materials, the gas generated by the combustion of gunpowder 2 in chamber A of the pyrotechnic device should be pure, and the combustion product should be free of solid particles. The gunpowder 2 can be selected as propellant SF-3. If necessary, a filter 7 can be set at the front end of Tesla valve 3 to ensure that the gas passing through the flow passage of Tesla valve 3 and throttle 4 is pure and clean. Figure 3 Shown is a schematic diagram of the structure of a fire-actuated actuator based on a Tesla valve including a filter.

[0030] Here’s how it works:

[0031] In the initial state, the piston rod 5 of the pyrotechnic actuator is in a retracted position. After receiving the ignition command, the electric ignition device 1 ignites and ignites the gunpowder 2. The high-temperature and high-pressure gas generated by the combustion of the gunpowder 2 acts on the piston surface of the piston rod 5. The high-temperature and high-pressure gas passes through the Tesla valve 3 and the throttle 4 successively and enters the B chamber from the A chamber. Since the flow resistance of the gas from the A chamber to the B chamber is very small, at this stage, the throttling effect of the throttle 4 plays a leading role in the gas pressure regulation between the A chamber and the B chamber.

[0032] As the gunpowder 2 continues to burn steadily, the gas pressure in chamber A and chamber B gradually increases. When the output force can overcome the external load, the piston rod 5 begins to move linearly relative to the cylinder 6. As the displacement of the piston rod 5 gradually increases, the volume of chamber A of the fire-actuated device continues to increase while the volume of chamber B continues to decrease. Since the gas supply in chamber A is sufficient and the pressure continues to increase, and continues to flow into chamber B through the Tesla valve 3 and the throttle 4, the pressure in chamber B increases due to the mass flow rate of the inflowing gas and the volume compression effect. At this stage, the gas pressure in chamber A is significantly higher than that in chamber B. The output force of the fire-actuated device mainly overcomes the external load to do work, and the throttling effect of the throttle 4 plays a leading role in regulating the gas pressure in chambers A and B.

[0033] As the piston rod 5 continues to move and approaches the end of the stroke, the volume of the B chamber of the fire-actuated device decreases significantly, and the mass of the gas flowing in from the A chamber is superimposed, so that the gas pressure in the B chamber increases significantly and is greater than the gas pressure in the A chamber. At this time, the gas in the B chamber of the fire-actuated device flows to the A chamber through the throttle 4 and the Tesla valve 3 successively. At this stage, the reverse flow effect of the Tesla valve plays a leading role in the gas pressure regulation of the A chamber and the B chamber, so that the mass of the gas flowing from the B chamber to the A chamber is small, and the gas in the B chamber forms an air cushion, thereby achieving the end buffer of the piston rod and effectively reducing the impact of the arrival.

[0034] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fire-operated device based on a Tesla valve, characterized in that: The invention comprises an electric igniter (1), gunpowder (2), a Tesla valve (3), a throttle (4), a piston rod (5) and a cylinder (6), wherein the electric igniter (1) is fixed at the front end of the cylinder (6); the piston rod (5) is arranged in the cylinder (6) and can move along the axial direction of the cylinder; the piston rod (5) is a T-shaped structure, comprising a T-head and a tail rod, and the tail rod passes through the bottom end of the cylinder (6); the gunpowder (2) is arranged in the cylinder (6) and is located between the electric igniter (1) and the T-head of the piston rod (5); a mounting hole is arranged in the T-head of the piston rod (5) along the axis, and the mounting hole extends to the tail rod of the piston rod; the Tesla valve (3) is installed in the mounting hole of the T-head of the piston rod (5), and the throttle (4) is installed on the tail rod of the piston rod (5) and is located outside the through hole extending to the tail rod of the piston rod (5).

2. A Tesla valve-based fire-actuated device as claimed in claim 1, characterized in that: The central axis of the Tesla valve (3) is arranged to coincide with the central axis of the piston rod (5); the central axis of the throttle (4) is arranged to be perpendicular to the central axis of the piston rod (5).

3. A Tesla valve-based fire-actuated device as claimed in claim 1, characterized in that: The Tesla valve (3), the throttle (4) and the piston rod (5) are threadedly connected, and thread sealant is applied to the threaded connection.

4. A Tesla valve-based fire-actuated device as claimed in claim 1, characterized in that: According to output requirements and boundary conditions, the number of units of the Tesla valve (3) is increased / decreased to achieve enhancement / reduction of the unidirectional conductivity through the Tesla valve (3).

5. A Tesla valve-based fire-driven device as claimed in claim 1, characterized in that: According to output requirements and boundary conditions, by increasing / decreasing the diameter of the throttle hole and the number of units of the throttle (4), the gas flow area of ​​the throttle (4) is increased / decreased, thereby reducing / increasing the gas pressure drop before and after the throttle (4).

6. A Tesla valve-based pyrotechnic device as claimed in claim 1, characterized in that: Gunpowder (2) Select propellant SF-3.

7. A Tesla valve-based pyrotechnic device according to any one of claims 1 to 6, characterized in that: The invention also comprises a filter (7), wherein the filter (7) is arranged at the front end of the Tesla valve (3).

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