The double-acting air motor

 

The air motor is designed for steering aircraft or other control systems with pneumatic actuators that use a working fluid with a high fever. The air motor consists of a cylinder with choke for regulating the pressure of the working fluid in the cavities, closed on two sides sealing lid with a Central hole to move the piston rod. The piston is made in the form of a flange on the rod to each side of which washers threaded bushings with skirts pinned internal broader part of the rubber cuffs, made in the form of rings with a V-shaped cross-section. This skirt threaded bushing having a height, a slightly smaller width of the inner part of the cuff that their ends rest against the flange. At the same time between the flange and each sleeve with a gap set PTFE rings with rectangular cross-section, within which is placed above the cuff. Each PTFE ring inside tightened more narrow outer part of the cuff to the side of the cylinder. The technical result is increased efficiency. air motor. 1 Il.

The invention relates to the field of pneumatic who tion devices or other control systems with pneumatic actuators, using a working fluid with a high fever.

In aircraft expendable restricted functioning of the common gas pneumatic, characterized by small dimensions and weight characteristics of the source of the working fluid and the air motor. The most effective design of pneumatic working on a working body with high settings on temperature and pressure.

The pneumatic double-acting consist of a pneumatic cylinder with located inside the piston dividing the volume of the cylinder into two cavities. The movement of the piston is effected under the action of the working fluid of high pressure (air, gas) discharged in accordance with the management team in one of the cavities of the cylinder.

To prevent flowing of the working fluid injected from the cavity into the cavity of the discharge from which the piston is pushed out the spent working fluid, the piston is mounted the sealing device.

Role sealing device perform rubber cuffs of various designs, which must, on the one hand, during the required time efficiently to ensure the sealing of the cavities of the cylinder, the amount which reduces the efficiency.

When used as a working fluid compressed air or cold gas above conditions satisfy the pneumatic [1] with the sealing device made in the form of two coaxial rings with different diameters, connected by a jumper, and placed in an annular groove around the piston [2]. Having a low radial stiffness, the seal is easily the same size as the sealing diameter of the cylinder, and boarding diameter in the groove on the piston, creating a little friction in its movement. However, to apply the design when working on the hot gas is not possible.

When the air motor both sides of the cuff alternately in contact with the hot gas with a temperature of up to 400With that leads to its rapid heating and destruction.

Besides direct contact cuff with heated from the hot gas to the walls of the cylinder is additionally speeds up the process of destruction of the cuff due to the mechanical action of the hot wall to the material of the cuff when the piston is moved. The destruction of the cuff being is dvigatelya 6...7 seconds.

The well-known double-acting air motor used in the scheme of the automated actuator operating on hot gas [3], and adopted by the authors for the prototype.

In the specified pneumatic engine has a choke for regulating the pressure in the cavities of the cylinder, the lid and the bottom of which there are openings for loading the piston rod. To increase the operating time of the air motor on the hot gas on the piston is fitted with two rubber cuff above design. When this piston is designed as a removable flange, which together with installed with its two sides washers pressed nut to the ledge on the piston rod. On the end surfaces of the washers and flange grooves are available for placement of the cuffs, which are installed between the flange and each washer. The air motor operates as follows. When filing in accordance with the control signal high gas temperature in one of the cavities of the air motor, the gas pressure acts on the washer of the piston, moving it in the direction oboronyayas cavity. Thus as the hot gas acts on each cuff only from its cavity, and the other side is pressed against the flange of the piston receiving part of the heat OTP>

When using a working fluid with a lower temperature (for example, with the temperature in the working cavities 200...250(C) the operating time of the air motor increases to 120C.

However, if necessary, further increasing the time of operation of the air motor to apply the design is not possible.

Object of the present invention is a significant (not less than 2-fold) increase in operating time of the air motor on the hot gas with a temperature of up to 400With the increase of its efficiency.

To solve this problem, the authors proposed a double-acting air motor consisting of a cylinder with choke for regulating the pressure of the working fluid in the cavities, closed on two sides sealing lids, in a Central hole which is installed on the piston. The piston is made in the form of a flange, each side of which the washers are pressed rubber cuff. New in comparison with the prototype is that each cuff is made in the form of a ring with a V-shaped cross section with a wider inner part, which is sandwiched between the flange and the washer. Each washer is made in the us inner part of ring with a V-shaped cross-section, rests on the flange. At the same time between the flange and each sleeve with a gap set PTFE rings with rectangular cross-section. Inside the ring is placed above the cuff, clamped narrower upper part of the V-shaped section PTFE rings to the side of the cylinder. Each PTFE ring has a cross-section at an angle lying within 30-60the end surface of the ring and the outer ring diameter equal to the inner diameter of the cylinder, which in turn exceeds the diameter of the flange of the piston and threaded bushings are equal to each other.

The proposed technical solution is illustrated by a graphic drawing. The drawing shows a structural diagram of the proposed pneumatic engine, where the uniting part is a pneumatic cylinder 1, with the two sides by means of split rings 4 is closed by the lid 3, the sealing gaps on the cylinder and the Central holes in the lids. In the holes of the covers has a stem 2, in the middle part of the flange "f". On both sides of the flange on the thickening of the stem made the thread, which is twisted a threaded sleeve 5 to lock the ends of their skirts in the flange. Ring cramps the section cuffs being lower threaded bushings are not trapped and are able to deform in the radial direction. Thanks to this, they feel the pressure to the walls of the split cylinder bore ring 6, which is installed between the flange and threaded bushings with a clearance of 0.01 to 0.04 mm Chokes "D" are used to control the pressure in the cavity of the pneumatic cylinder in accordance with the received command.

The application of the cuff c V-shaped cross section allowed us to separate the functional purpose of the upper and lower portions of the section. The lower part of a broader, designed for a tight clamping of the cuff between the sleeve and the flange, which does not allow hot gas to flow through the inner diameter of the cuff. The upper part of the cuff section is narrower, and has the ability to deform in the radial direction due to the elastic forces of the rubber pressed PTFE ring to the cylinder wall, preventing the flow of gas in the cylinder.

Transverse section of the PTFE rings when there is a clearance of 0.01-0.04 mm between their ends and the flange provides mobility PTFE rings in the radial direction, which guarantees their firm pressing of the cuff to the wall of the cylinder with the exception of rubbing and jamming of the moving piston.

When this incision is made in the Teflon rings at an angle of 30-60

To eliminate friction of metal parts of the piston against the walls of cylinder diameters flange and sleeves made 0.15-0.2 mm smaller than the inner diameter of the cylinder. Thus when the piston only pursed cuffs rings are in contact with the surface of the cylinder. Being made of fluoroplastic these rings create significantly less friction than rubber cuff in the prototype, increasing the efficiency of the actuator.

The air motor operates as follows. With the increase in accordance with the control command pressure hot gas in one of the cavities of the cylinder increases, the force acting on the piston side of the given cavity, and the piston begins to move to the other side of the cavity from which they are expelled through the orifice of this cavity hot exhaust gas. When changing the polarity of the control signal cavity switch roles and the piston begins to move in the opposite direction. In the operation of a pneumatic cylinder hot gas acts directly on the ends of the PTFE rings, a material which has a temperature of destruction, about 2 times the limit for rubber. In addition, PTFE ring protects R between the cylinder wall 1 and the threaded sleeve 5, and then through the gap between the end of the Teflon ring and the threaded sleeve 5 in the amount of 0.01-0.04 mm) falls in volume, in which is located a rubber cuff. The gas pressure in the specified volume, affecting the upper part of the V-shaped section of the cuff, additionally pressed PTFE ring to the wall of the cylinder, preventing the flow of gas through the piston. However due to the small area of the gaps, connecting the cavity of the pneumatic cylinder with a volume, where the cuff, in the latter creates a stagnant zone, preventing the entry of new portions of the hot gas with a high temperature. Listed design features create operating temperature cuff more favorable than in the prototype, which increases the time proposed by the authors of the pneumatic actuator to 35-36 seconds.

Sources of information

1. B. N. Alekseev "To the question of improvement of technical and economic parameters of power control," in Proc. of the Pneumatic actuators and control systems", Nauka, M., 1971, S. 220, Fig.2 is similar.

2. B. N. Alekseev "To the question of improvement of technical and economic parameters of power control," in Proc. of the Pneumatic actuators and control systems", Nauka, M., 1971, S. 2.5 - the prototype.

Claims

The double-acting air motor consisting of a cylinder with choke for regulating the pressure of the working fluid in the cavities, closed on two sides sealing lids, which have Central holes to move the rod with a piston, made in the form of a flange, to both sides of which the washers are pressed rubber cuffs, characterized in that it each cuff is made in the form of a ring with a V-shaped cross section with a wider inner part, which is sandwiched between the flange and the washer made in the form of a threaded sleeve with a skirt that wearing the cuff and the end of the skirt, with a height somewhat less than the width of the inner part of the ring with a V-shaped cross-section, rests on the flange, at the same time between the flange and each sleeve with a gap set PTFE rings with rectangular cross-section, within which is placed above the cuff, clamped its narrower exterior part of the Teflon ring to the side of the cylinder, while the Teflon rings have a cross-section at an angle to the end surface lying within 30-60and external di is Esipovich sleeves, equal to each other.

 

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