CN112963389B - Integrated self-pressurization oil cylinder with pressure compensation structure - Google Patents
Integrated self-pressurization oil cylinder with pressure compensation structure Download PDFInfo
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- CN112963389B CN112963389B CN202110133459.9A CN202110133459A CN112963389B CN 112963389 B CN112963389 B CN 112963389B CN 202110133459 A CN202110133459 A CN 202110133459A CN 112963389 B CN112963389 B CN 112963389B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
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Abstract
The invention provides an integrated self-pressurization oil cylinder with a pressure compensation structure, which comprises an oil cylinder body, a cylinder bottom, a pressurization primary piston rod, a built-in energy accumulator piston, an energy accumulator piston limiting block, a pressurization secondary piston rod, an inflation joint, an oil filling port oil plug and the like; an oil cylinder body is arranged on the cylinder bottom, and a low-pressure oil cavity is formed between the pressurization primary piston rod and the cylinder bottom; the inner part of the pressurization primary piston rod is hollowed, and forms an energy accumulator with a built-in energy accumulator piston, and the pressure inside the energy accumulator is pre-charged; the inner part of the pressurizing secondary piston rod is hollowed out to be used as a high-pressure oil cavity, and the pressurizing primary piston rod extends into the high-pressure oil cavity when being pressed upwards; the system oil pressure is amplified by setting the ratio of the piston surface area of the pressurization primary piston rod to the sectional area of the piston rod. The device meets the requirement of a high-pressure system through lower pressure of an oil-liquid system, has ingenious and compact structural design, can sensitively compensate the pressure fluctuation of a load, and effectively reduces the cost of the whole hydraulic system.
Description
Technical Field
The invention belongs to the field of hydraulic equipment, and particularly relates to an integrated self-pressurizing oil cylinder with a pressure compensation structure.
Background
The oil cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion). The reciprocating motion device has simple structure and reliable work, can avoid a speed reducer when the reciprocating motion is realized, has no transmission clearance, and moves stably, thereby being widely applied to hydraulic systems of various machines. In addition, in order to increase the working pressure of the oil cylinder, a high-pressure pump is generally adopted for supplying oil, and the cost is higher. The booster cylinder is designed to combine the advantages of the cylinder and aims to quickly activate the cylinder to perform a low-pressure stroke in a low-load state and automatically switch to a high-pressure stroke mode in a high-load state under the constant system low-pressure oil supply, so as to output the force with required strength according to requirements. The booster cylinder can be widely applied to hydraulic pump stations, machine tools, clamping machinery and other equipment.
The accumulator is an energy storage device in a hydraulic pneumatic system, converts energy in the system into compression energy or potential energy at proper time for storage, and converts the compression energy or the potential energy into hydraulic energy or air pressure energy for release when the system needs the energy, and then supplies the energy to the system again. When the system pressure is increased instantaneously, it can absorb the energy of the part to ensure the pressure of the whole system is normal. The existing energy accumulator is mostly connected with the oil cylinder through a long hose, the disassembly and the assembly are troublesome when the existing energy accumulator is used, and secondly, the energy accumulator connecting pipeline is long and has large resistance, so that the energy accumulator has slow reaction and is difficult to meet the production requirement of a precise oil cylinder.
Therefore, it is necessary to provide an integrated self-pressurizing cylinder with a pressure compensation structure to solve the above problems.
Disclosure of Invention
The invention provides an integrated self-pressurizing oil cylinder with a pressure compensation structure aiming at the defects of the prior art, and aims to solve the problems that the prior energy accumulator proposed in the background art is mostly connected with an oil cylinder through a longer hose, the assembly and disassembly are troublesome when in use, the pipeline is longer, the resistance is larger, the reaction of the energy accumulator is slower, in addition, the high-pressure oil cylinder adopts a high-pressure pump to supply oil, the cost is higher, and the production requirement of a precision oil cylinder is difficult to meet.
In order to achieve the purpose, the invention adopts the technical scheme that: the integrated self-pressurizing oil cylinder with the pressure compensation structure comprises an oil cylinder body, a cylinder bottom, a pressurizing primary piston rod, a built-in energy accumulator piston, an energy accumulator piston limiting block, a pressurizing secondary piston rod, an inflation joint, an oil filling port oil plug, a corresponding hydraulic sealing element and a bolt fastener.
The oil cylinder body is arranged on the cylinder bottom, the oil cylinder body and the cylinder bottom are fixedly connected through a fastening bolt, and an O-shaped ring is arranged on the side edge of the cylinder bottom to ensure the sealing of a joint surface. And a pressurizing primary piston rod and a pressurizing secondary piston rod are sequentially arranged in the oil cylinder body from bottom to top.
And a low-pressure oil cavity is formed between the supercharging primary piston rod and the cylinder bottom.
The energy accumulator is characterized in that the inner part of the pressurizing primary piston rod is hollowed out to serve as an energy accumulator shell, a built-in energy accumulator piston is arranged at the lower end of the energy accumulator shell, the energy accumulator shell is sealed, and an energy accumulator piston limiting block is arranged to ensure that the built-in energy accumulator piston does not exceed the piston bottom surface of the pressurizing primary piston rod.
And the lower end of the piston of the built-in energy accumulator is provided with an inflation joint for pre-charging the inner part of the shell of the energy accumulator.
The inner part of the pressurizing secondary piston rod is hollowed to serve as a high-pressure oil cavity, the sectional area of the pressurizing primary piston rod is the same as that of the high-pressure oil cavity, and the pressurizing primary piston rod extends into the high-pressure oil cavity when being pressed upwards.
And setting the ratio of the piston surface area of the pressurization primary piston rod to the sectional area of the piston rod to obtain the amplification ratio of the pressure.
The invention has the beneficial effects that: the oil cylinder is provided with an oil system pressurizing structure, the requirement of a high-pressure system can be met through lower oil system pressure, the oil cylinder is ingenious and compact in structural design, and the inner part of a primary pressurizing piston rod of the oil cylinder is hollowed out to serve as a self-provided energy accumulator, so that the pressure adjustment of the oil cylinder is more sensitive. The inner part of the pressurizing secondary piston rod of the oil cylinder is hollowed to serve as a pressurizing oil cavity, the pressurizing primary piston rod can extend into the pressurizing secondary piston rod, the overall dimension height of the oil cylinder is reduced, the oil cylinder can sensitively compensate the pressure fluctuation of the load, and the construction cost of the whole hydraulic system is effectively reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the present invention in operation.
In fig. 1: 1-cylinder body, 2-cylinder bottom, 3-supercharging primary piston rod, 4-built-in accumulator piston, 5-accumulator piston limiting block, 6-supercharging secondary piston rod, 7-front cylinder cover, 8-supercharging piston position sealing element retaining ring, 9-cylinder body side inner sealing element retaining ring, 501-O ring, 502-guide belt, 503-UN seal, 504-guide belt, 505-seal ring, 506-seal ring, 507-guide belt, 508-seal ring, 509-guide belt, 510-seal ring, 511-seal ring, 512-guide belt, 513-seal ring, 514-O ring, 515-O ring, 516-guide belt, 601-fastening bolt, 602-inflation joint, 603-fastening bolt, 604-fastening bolt, 605-fastening bolt, 606-oil filling port oil plug, firstly-oil cylinder oil inlet, secondly-exhaust port, thirdly-high pressure oil chamber, fourthly-inflation chamber and fifthly-low pressure oil chamber.
In fig. 2: 1-an oil cylinder body, 2-a cylinder bottom, 3-a boosting primary piston rod, 4-a built-in energy accumulator piston, 5-an energy accumulator piston limiting block, 6-a boosting secondary piston rod, 7-a front cylinder cover, 8-a boosting piston position sealing part retaining ring, 9-a cylinder body side internal sealing part retaining ring, firstly-an oil cylinder oil inlet, secondly-an exhaust port, thirdly-a high-pressure oil cavity, fourthly-an inflation cavity and fifthly-a low-pressure oil cavity.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and 2, the whole integrated self-pressurizing oil cylinder with the pressure compensation structure mainly comprises an oil cylinder body 1, a cylinder bottom 2, a pressurizing primary piston rod 3, a built-in energy accumulator piston 4, an energy accumulator piston limiting block 5, a pressurizing secondary piston rod 6, an inflation joint 602, an oil filling port oil plug 606, an oil cylinder oil inlet (I), an exhaust port (II), a high-pressure oil cavity (III), an inflation cavity (IV) and a low-pressure oil cavity (V).
The cylinder bottom 2 is provided with an oil cylinder body 1, the oil cylinder body 1 and the cylinder bottom 2 are fixedly connected through a fastening bolt 601, and an O-shaped ring 501 is arranged on the side edge of the cylinder bottom 2 to ensure the sealing of a joint surface. The front cylinder cover 7 and the cylinder body 1 are fixedly connected through a fastening bolt 605.
The cylinder body 1 is internally provided with a pressurization primary piston rod 3 and a pressurization secondary piston rod 6 from bottom to top in sequence. Wherein, a low-pressure oil cavity (fifth) is formed between the booster primary piston rod 3 and the cylinder bottom 2, and pressure oil is input into the low-pressure oil cavity (fifth) through an oil inlet of the oil cylinder (first).
The inside of the pressurization primary piston rod 3 is partially hollowed out to serve as an energy accumulator shell, a built-in energy accumulator piston 4 is arranged at the lower end of the energy accumulator shell, the energy accumulator shell is sealed, and the piston bottom surface of the pressurization primary piston rod 3 cannot be exceeded when the energy accumulator piston is limited by 5 energy accumulator pistons to ensure that the built-in energy accumulator piston 4 moves downwards. The lower end of the piston 4 of the built-in accumulator is provided with an air charging joint 602 for pre-charging the air charging cavity (a) formed inside the accumulator housing, such as charging nitrogen.
The inside of the pressurizing secondary piston rod 6 is partially hollowed to form a high-pressure oil cavity III, the sectional area of the pressurizing primary piston rod 3 is the same as that of the high-pressure oil cavity III, and when the pressurizing primary piston rod 3 is pressed upwards, the pressurizing primary piston rod 3 extends into the high-pressure oil cavity III. The top surface of the booster secondary piston rod 6 is provided with an oil filling port for filling hydraulic oil and an oil filling port oil plug 606, and the high-pressure oil cavity of the oil cylinder is filled with the hydraulic oil through the oil filling port, so that the air in the high-pressure oil cavity is completely emptied.
In order to ensure the sealing performance between the booster two-stage piston rod 6 and the cylinder body 1, a cylinder body side inner sealing part retainer ring 8 and a cylinder body side inner sealing part retainer ring 9 are arranged on the sealing ring 510 and the sealing ring 511, and then are connected and fixed through a fastening bolt 603 and a fastening bolt 604. In the same way, each sealing ring is additionally provided with a cylinder side internal sealing part retainer ring and is connected and fixed with the pressurizing secondary piston rod 6 and the oil cylinder body 1 through a fastening bolt.
According to the requirement of the pressurization effect, the amplification ratio of the pressure is obtained by setting the ratio of the piston surface area of the pressurization primary piston rod 3 to the sectional area of the piston rod.
The piston upper cavity of the pressurization primary piston rod 3 and the piston upper cavity of the pressurization secondary piston rod 6 are respectively connected with the atmosphere through an exhaust port and exhaust.
Before the pressurizing primary piston rod 3 is installed in the oil cylinder, nitrogen is filled into an energy accumulator inside the pressurizing primary piston rod through the air charging connector, and then the pressurizing primary piston rod is assembled inside the oil cylinder.
The built-in accumulator piston 4 is pressed to move upwards, and when the system pressure fluctuates, the built-in accumulator piston 4 compensates the pressure fluctuation of the pressure oil in the low-pressure oil cavity (Tth) by floating up and down.
The working process of the invention is as follows:
before the pressurizing primary piston rod 3 is installed in the oil cylinder body 1, nitrogen is filled into an inflation cavity IV inside the pressurizing primary piston rod 3 through an inflation connector 602, the filling pressure of the nitrogen is 12Mpa, the filling is sealed after the filling is completed, the pressurizing primary piston rod 3 is assembled inside the oil cylinder body 1, after all parts are installed, hydraulic oil is filled into a high-pressure oil cavity III through an oil filling port at the top end of a pressurizing secondary piston rod 6, it is guaranteed that air in the high-pressure oil cavity III is completely emptied, and then an oil filling port oil plug 606 is screwed.
The oil cylinder is connected into a hydraulic system, pressure oil is supplied to a low-pressure oil cavity (a fifth) through an oil inlet of the oil cylinder, the oil pressure of the low-pressure oil cavity (the fifth) of the hydraulic system is 16Mpa, the charging pressure of nitrogen in a charging cavity (a fourth) inside a pressurization primary piston rod 3 is 12Mpa, the pressure oil of the low-pressure oil cavity (the fifth) of the hydraulic system is larger than the charging pressure of the nitrogen in the charging cavity (a fourth) of the built-in energy accumulator, the built-in energy accumulator piston 4 moves upwards under the pressure, the charging gas in the charging cavity (a fourth) of the built-in energy accumulator is compressed, and the built-in energy accumulator piston 4 can float up and down to compensate the pressure fluctuation of the pressure oil when the system fluctuates. When the system pressure is reduced, the piston 4 of the built-in energy accumulator moves downwards to compensate the reduction of the system pressure; when the system pressure becomes high, the built-in accumulator piston 4 moves upward, and the increase amount of the system pressure is reduced. Because pressure oil is input into the low-pressure oil cavity, the pressure oil is supplied to the low-pressure oil cavity through the oil inlet of the oil cylinder, the booster primary piston rod 3 moves upwards, an external load is loaded on the upper part of the booster secondary piston rod 6, the booster primary piston rod 3 moves upwards to cause the pressure in the high-pressure oil cavity (0) to rise, the piston area of the booster primary piston rod 3 is N times of the section of the piston rod of the booster primary piston rod 3, the booster primary piston rod 3 is balanced in stress according to a formula F (p) s, the hydraulic pressure on the piston surface of the booster primary piston rod 3 is equal to that on the piston rod surface of the booster primary piston rod 3 in magnitude and opposite in direction, and therefore the ratio of the piston area to the piston rod section is in inverse proportion to the pressurization of the hydraulic system.The diameter of a piston of a pressurizing primary piston rod 3 is 310mm, the diameter of the piston of the pressurizing primary piston rod 3 is 155mm, the oil pressure of a high-pressure oil cavity III is increased to 4 times of the oil pressure of a low-pressure oil cavity V, the pressure of the high-pressure oil cavity III is 64Mpa, and the pressurizing secondary piston rod rises due to the pressure in the high-pressure oil cavity III when the thrust F of an oil cylinder is increasedOilOil pressure P of high-pressure oil chamberHigh pressure chamberArea S of 6 pistons of supercharging two-stage piston rodSecondary piston faceWhen the gravity is larger than the load, the pressurizing secondary piston rod 6 moves upwards, and when the pressurizing primary piston rod 3 and the pressurizing secondary piston rod 6 move upwards, the piston upper cavity of the pressurizing primary piston rod 3 and the piston upper cavity of the pressurizing secondary piston rod 6 are connected with the atmosphere through an exhaust port and exhausted through an exhaust port.
After the increase is finished, the return process of the piston rod of the oil cylinder is as follows: the system oil pressure of the oil inlet of the oil cylinder is removed, and the oil cylinder pressurization primary piston rod 3 and the pressurization secondary piston rod 6 fall back due to self weight.
The O-ring 501 prevents the hydraulic oil in the low-pressure oil chamber (fifthly) from leaking through the matching surface between the cylinder body 1 and the cylinder bottom 2.
The guide belt 502 and the UN seal 503 prevent the hydraulic oil in the low-pressure oil chamber (c) from leaking through the mating surface between the cylinder body 1 and the booster primary piston rod 3.
The guide belt 504, the seal ring 505, the seal ring 506 and the guide belt 507 prevent the hydraulic oil in the low pressure oil chamber (c) and the nitrogen in the air charging chamber (c) from leaking each other.
The seal ring 508, the guide belt 509 and the seal ring 510 can prevent the hydraulic oil in the high-pressure oil chamber (c) from leaking through the matching surface between the cylinder body 1 and the booster primary piston rod 3.
The sealing ring 511, the guide belt 512 and the sealing ring 513 can prevent the hydraulic oil in the high-pressure oil chamber III from leaking through the matching surface between the cylinder body 1 and the pressurizing secondary piston rod 6.
The O-shaped ring 514, the O-shaped ring 515 and the guide belt 516 can seal the pressurizing secondary piston rod 6 with the outside of the oil cylinder, so that dust particles and the like can not enter the oil cylinder.
Claims (5)
1. The utility model provides a take pressure compensation structure's integrated form from pressure boost oil cylinder which characterized in that:
the oil cylinder comprises an oil cylinder body, a cylinder bottom, a pressurization primary piston rod, a built-in energy accumulator piston, an energy accumulator piston limiting block, a pressurization secondary piston rod, an inflation joint and an oil filling port oil plug;
an oil cylinder body is arranged on the cylinder bottom, and a pressurizing primary piston rod and a pressurizing secondary piston rod are sequentially arranged in the oil cylinder body from bottom to top;
a low-pressure oil cavity is formed between the supercharging primary piston rod and the cylinder bottom;
the inner part of the pressurization primary piston rod is hollowed out to serve as an energy accumulator shell, a built-in energy accumulator piston is arranged at the lower end of the energy accumulator shell, so that the energy accumulator shell is sealed, and an energy accumulator piston limiting block is arranged to ensure that the built-in energy accumulator piston does not exceed the piston bottom surface of the pressurization primary piston rod;
the lower end of the piston of the built-in energy accumulator is provided with an inflation joint for pre-charging the inner part of the shell of the energy accumulator;
the inner part of the pressurizing secondary piston rod is hollowed to serve as a high-pressure oil cavity, the sectional area of the pressurizing primary piston rod is the same as that of the high-pressure oil cavity, and the pressurizing primary piston rod extends into the high-pressure oil cavity when being pressed upwards;
and setting the ratio of the sectional area of the piston surface of the pressurization primary piston rod to the sectional area of the piston rod of the pressurization primary piston rod to obtain the amplification ratio of the pressure.
2. The integrated self-pressurizing oil cylinder with the pressure compensation structure as claimed in claim 1, wherein:
and the pressurizing first-stage piston rod piston upper cavity and the pressurizing second-stage piston rod piston upper cavity are respectively connected with the atmosphere through exhaust ports and exhaust.
3. The integrated self-pressurizing oil cylinder with the pressure compensation structure as claimed in claim 1, wherein:
before the pressurizing primary piston rod is installed in the oil cylinder, nitrogen is filled into an energy accumulator shell inside the pressurizing primary piston rod through the air charging connector, and then the pressurizing primary piston rod is assembled inside the oil cylinder.
4. The integrated self-pressurizing oil cylinder with the pressure compensation structure as claimed in claim 3, wherein:
the built-in energy accumulator piston moves upwards under pressure, and compensates the pressure fluctuation of pressure oil through up-and-down floating when the system pressure fluctuates.
5. The integrated self-pressurizing oil cylinder with the pressure compensation structure as claimed in claim 1, wherein:
and hydraulic oil is filled into the high-pressure oil cavity through an oil filling port arranged at the top end of the pressurizing secondary piston rod, so that the air in the high-pressure oil cavity is completely emptied.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110133459.9A CN112963389B (en) | 2021-02-01 | 2021-02-01 | Integrated self-pressurization oil cylinder with pressure compensation structure |
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| CN202110133459.9A CN112963389B (en) | 2021-02-01 | 2021-02-01 | Integrated self-pressurization oil cylinder with pressure compensation structure |
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| CN112963389B true CN112963389B (en) | 2022-02-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210014A (en) * | 1996-02-06 | 1997-08-12 | Pabotsuto Giken:Kk | Booster type motor cylinder |
| CN101725580A (en) * | 2009-11-21 | 2010-06-09 | 潘孝敏 | Hydraulic pressure cylinder |
| CN203297192U (en) * | 2013-06-07 | 2013-11-20 | 湖北康擎重工科技有限公司 | Pressure maintaining oil cylinder system of holder of horizontal directional drilling machine |
| CN104533879A (en) * | 2015-01-14 | 2015-04-22 | 姜子涵 | Pressure stabilization compensation device and energy accumulator detection system with same |
| CN207762048U (en) * | 2018-01-12 | 2018-08-24 | 浙江工业职业技术学院 | A kind of double acting hydraulic cylinder of built-in accumulator |
| CN110578720A (en) * | 2018-06-07 | 2019-12-17 | 布柯玛蓄能器（天津）有限公司 | Energy accumulator with supercharging function |
-
2021
- 2021-02-01 CN CN202110133459.9A patent/CN112963389B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210014A (en) * | 1996-02-06 | 1997-08-12 | Pabotsuto Giken:Kk | Booster type motor cylinder |
| CN101725580A (en) * | 2009-11-21 | 2010-06-09 | 潘孝敏 | Hydraulic pressure cylinder |
| CN203297192U (en) * | 2013-06-07 | 2013-11-20 | 湖北康擎重工科技有限公司 | Pressure maintaining oil cylinder system of holder of horizontal directional drilling machine |
| CN104533879A (en) * | 2015-01-14 | 2015-04-22 | 姜子涵 | Pressure stabilization compensation device and energy accumulator detection system with same |
| CN207762048U (en) * | 2018-01-12 | 2018-08-24 | 浙江工业职业技术学院 | A kind of double acting hydraulic cylinder of built-in accumulator |
| CN110578720A (en) * | 2018-06-07 | 2019-12-17 | 布柯玛蓄能器（天津）有限公司 | Energy accumulator with supercharging function |
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