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  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 . 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 , 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 30-60To 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 information1. 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.
ClaimsThe 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.
FIELD: mechanical engineering.
SUBSTANCE: hydraulic cylinder comprises power cylindrical hydraulic mechanism that receives main hollow piston made of two members of different diameters, pressure and drain hoses connected with the power cylindrical hydraulic mechanism through the control block, and working member connected with the rod. The working member is made of two working members. The first working member is movable and is secured to the main tip provided with plug and mounted in the first face of the power cylindrical mechanism for permitting reciprocation along the longitudinal axis of the power hydraulic mechanism. The second working member is mounted from the side of the second face of the power cylindrical hydraulic mechanism. The pipe is mounted with a spaced relation to the inner surface of the rod. The control unit is mounted on the pressure-tight housing mounted on the side of the power cylindrical hydraulic mechanism. The space of the power cylindrical hydraulic mechanism receives bearing washer that is arranged along the longitudinal axis of the pressure-tight housing.
EFFECT: improved structure.
4 cl, 4 dwg
FIELD: piston-type pneumatic drive units, namely designs of pneumatic cylinders.
SUBSTANCE: pneumatic cylinder includes sleeve, rod cavity, piston cavity mutually divided by piston with Г-shaped cross section collars arranged in its turnings; spacing rubber round cross section ring placed in groove of piston and pressing sealing petals of Г-shaped cross section collar to sleeve. Said groove has curvilinear convex base having slopes to sides of lateral walls and ridge formed in middle of groove. Said ridge divides two spacing rubber round cross section rings arranged in said groove and pressing respectively sealing petals of Г-shaped cross section collars to sleeve.
EFFECT: enhanced efficiency and operational reliability of pneumatic cylinder.
FIELD: engine and pimps.
SUBSTANCE: hydraulic or pneumatic cylinder contains a sleeve, a rod, a piston dividing the cylinder inner space into a rod and piston spaces, a rear cover, a rod head and piston and rod head sealing elements incorporating anti-friction inserts of bearings of linear motion fitted on the piston and rod head bearing surfaces, respectively. At the said surfaces central part there are circular grooves, their length making about 1/3 of the length of the anti-friction inserts, and circular slots housing rubber rings, the slots communicating with the aforesaid circular grooves. The grooves and slots spaces communicate with the piston and rod head spaces via channels accommodating the valves. The material of antifriction inserts is impregnated with a binder to make the inserts elastic over the entire thickness that allow a good fit between the said inserts and bearing surfaces of the said piston and rod head, given there is a pressure in the spaces. The rod cover end face part accommodates a wiper element.
EFFECT: higher reliability.
FIELD: engines and pumps.
SUBSTANCE: air cylinder is designed to move working tools. The air cylinder incorporates a rod with a piston arranged in a built-up casing incorporating a cylindrical sleeve, a through and blind covers with holes accommodating the unions feeding a compressed air and damping throttling devices, air cylinder covers and piston are jet moulded from thermoplastic polymer material with a glass-fibre filler. The rod, unions and damping throttling devices have special grooves receiving O-rings. The throttling devices represents a bolt with a small head with through threaded bore and an annular groove made on outer thread along with a hole made at the level of the said groove perpendicular to the bolt axis.
EFFECT: simpler design, higher reliability, smaller weight and better performances.
6 cl, 11 dwg
FIELD: engines and pumps.
SUBSTANCE: loading assembly relates to machine building hydraulics and can be used to create loads in testing service units and adjusting hydraulic boosters. A variable dynamic load in the loading assembly is created by one spring working in compression and generating equal rod force in the "OUT" and "IN" travel from neutral. Availability of adjusting nut allows varying the rod backlash (rod travel from neutral with origination of a dynamic load). The use of elastic rings, adjusting stops, spaces filled with lubricating grease allows simulating load initiated by friction force.
EFFECT: higher reliability.
3 cl, 1 dwg
FIELD: engines and pumps.
SUBSTANCE: hydraulic cylinder comprises a casing, a piston, a rod, lugs and seals, the casing and rod representing cylindroids. The casing, piston and rod cross-section edges are described by the expression x2/a2+y/b2=1, where a is the ellipse larger half-axis length, b is the ellipse smaller half-axis. The casing, piston and rod cross-section edges should meet the following condition, i.e. a/b=1.8...2.7.
EFFECT: higher bending resistance in the cylinder lengthwise plane and ruling out the piston rotation in the casing relative to lengthwise axis.
FIELD: instrument making.
SUBSTANCE: invention is related to stop ring used in hydraulic cylinder to fix cover to cylinder body. Stop ring is installed in hydraulic cylinder, having chamber with elliptical shape of cross section, and fixes covers that are installed at ends of mentioned body of cylinder. Stop ring comprises bent section, which is installed on surface of internal wall of cylinder chamber and is bent along surface of internal wall of cylinder chamber, a pair of straight sections that diverge from both ends of bent sections and passing parallel to each other, and a pair of convex sections installed on mentioned straight sections and having openings.
EFFECT: invention provides for improved reliability of hydraulic cylinder chamber cover fixation with elliptical shape of cross section.
7 cl, 15 dwg
FIELD: machine building.
SUBSTANCE: invention relates to bearing structure of damper in hydraulic actuator. Structure for fixation of damper (72a, 72b) is located in hydraulic actuator. Coats (14, 16) are installed on of the cylinder (12) casing. Piston (18,) is installed inside the cylinder (12) casing. Damper groove (70a, 70b) contains the first and the second grooves. The first groove (74) is open from the side of end surface. The second groove (76) is located adjoining to the first groove (74) and expands relative to it. According to the first version damper groove (70a, 70b) is formed on the end surface of piston (18) perpendicularly to its axis and is directed to covers (14, 16). According to the second version damper groove is formed on the end surface of cover (14, 16) perpendicularly to its axis and is directed to piston (18). Damper (72a, 72b) contains basic element (80) and expanding relative to its guideline element (82).
EFFECT: creation of structure providing easy and reliably install damper on piston or covers.
7 cl, 17 dwg
FIELD: machine building.
SUBSTANCE: hydraulic actuator is provided for transmission of tractive effort to relocated object. In casing with end cover it is located piston connected to flexible rod with dragging clutch. Compaction unit of flexible rod contains locked cavity with flexible material and sealing element, compressed by piston of cover and pistons of pressure transformer. Hydraulic actuator is outfitted by resilient backbone site including annular bearings connected to resilient members by means of movable bearing bushes installed with ability of shifting in radial direction at caving in of flexible rod and in axial direction at damping of piston or clutch by compaction unit. Resilient members interacting to piston of pressure transducer and movable end cover are matched to cleaning members.
EFFECT: reduction of member's wear higher efficiency, simpler design and pressure transducer.
10 cl, 5 dwg
FIELD: engines and pumps.
SUBSTANCE: hydraulic cylinder is designed for moving operating equipment of material-handling machines from one position to another. Hydraulic cylinder includes housing 1, plunger 2, guide bush 3, sealing 4, hold-down nut 5, and wiper 6. Outer surface of guide bush 3 is made in the form of stepped cylinder so that shoulder 9 is formed, which interacts with the edge of hold-down nut 5; at that, inner bore of hold-down nut 5 envelopes outer surface 8 of smaller diametre with radial gap so that cavity for arrangement of wiper 6 is formed.
EFFECT: increasing service life of plunger hydraulic cylinder by decreasing the wear in "plunger/guide bush" pair.