CN111946587B - Self-pressure-discharging adjustable buffer gas pressure cylinder - Google Patents

Self-pressure-discharging adjustable buffer gas pressure cylinder Download PDF

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Publication number
CN111946587B
CN111946587B CN202010857552.XA CN202010857552A CN111946587B CN 111946587 B CN111946587 B CN 111946587B CN 202010857552 A CN202010857552 A CN 202010857552A CN 111946587 B CN111946587 B CN 111946587B
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China
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hydraulic
cylinder
pressure
cavity
stroke
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CN111946587A (en
Inventor
高海平
李新年
信石玉
宋满华
卢文青
钱伟强
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China Petrochemical Corp
Sinopec Oilfield Equipment Corp
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China Petrochemical Corp
Sinopec Oilfield Equipment Corp
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Priority to CN202010857552.XA priority Critical patent/CN111946587B/en
Publication of CN111946587A publication Critical patent/CN111946587A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/111—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
    • F04B9/113—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting liquid motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/005—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders with two cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/122—Cylinder block
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses a self-pressure-discharging adjustable buffer gas pressure cylinder, which is used in a gas compressor, wherein a low-pressure hydraulic cavity of the pressure cylinder is divided into two parts by a stroke tail end buffer sleeve: one part of the oil can be discharged outwards only through the throttling port of the adjustable needle valve, and the buffering effect of the inertia load of the pressure cylinder can be adjusted by adjusting the size of the throttling port of the needle valve; the other part is used for communicating the high-pressure hydraulic cavity and the low-pressure hydraulic cavity at the tail end of the boosting stroke so as to realize self-pressure discharging of a hydraulic system at the tail end of the stroke of the boosting cylinder and reduce hydraulic reversing impact. Compared with the existing gas pressure cylinder of the hydraulic compressor, the gas pressure cylinder of the hydraulic compressor can simultaneously realize the self-pressure relief of a hydraulic system at the stroke tail end of the pressure cylinder and the effective buffering of the inertia load of the pressure cylinder, has the obvious effects of reducing hydraulic reversing impact and inertia load impact, can effectively prolong the service life of the gas pressure cylinder, reduces the integral operation vibration and noise of the hydraulic compressor, and has higher engineering practical application value.

Description

Self-pressure-discharging adjustable buffer gas pressure cylinder
Technical Field
The invention relates to the field of petroleum equipment. More specifically, the invention relates to a self-discharging adjustable buffer pressure cylinder.
Background
The gas pressurization is widely applied in the field of gas delivery, wherein a compressor is a key device for gas pressurization delivery. The hydraulic compressor has been widely used in natural gas filling substations due to its wide pressure application range and relatively low cost. The gas pressure cylinder is the core equipment of the hydraulic compressor.
With the gradual enhancement of environmental awareness of people, the vibration and noise of the hydraulic compressor become an important index for measuring the comprehensive performance of the compressor. The existing gas pressure cylinder generally adopts a single-stage or multi-stage forced buffering mode at the tail end of a stroke to reduce the impact of the pressure cylinder so as to achieve the aim of reducing vibration and noise, and practice proves that the vibration and noise reduction effect of the gas pressure cylinder is not ideal.
Disclosure of Invention
The invention provides a self-pressure-discharging adjustable buffer gas pressure cylinder capable of effectively reducing vibration and noise.
In order to achieve the purposes and other advantages, the invention provides a self-discharging adjustable buffer gas pressure cylinder, which comprises a first cylinder barrel and a second cylinder barrel, wherein a slidable piston mechanism is coaxially arranged in the first cylinder barrel and the second cylinder barrel, the piston mechanism comprises a piston rod and pistons arranged at two ends of the piston rod, and further comprises a connecting body, a buffer sleeve mechanism, a stroke tail end unloading device and a stroke tail end buffer device, wherein the connecting body is provided with a first hydraulic oil port for communicating an electro-hydraulic reversing valve working oil port with a first cylinder barrel hydraulic cavity and a second hydraulic oil port for communicating the electro-hydraulic reversing valve working oil port with a second cylinder barrel hydraulic cavity; the buffer sleeve mechanism comprises a buffer sleeve which is arranged on the piston rod and attached to the inner side surface of the piston, and the buffer sleeve is combined with the end surface of the connecting body and blocks the low-pressure hydraulic cavity into a buffer hydraulic cavity and an unloading hydraulic cavity at the tail end of the stroke of the pressure cylinder; the stroke end unloading device is characterized in that a connecting body is provided with a communicating pore passage for communicating a high-pressure hydraulic cavity and an unloading hydraulic cavity on two sides of the connecting body, a pair of check valves arranged in opposite directions are arranged in the communicating pore passage, each check valve comprises a gland and a valve rod, the tail end of each valve rod is provided with a spherical structure, when the spherical structure is jacked to a shrinkage cavity section, pores of the spherical structure are opened, the two glands are respectively arranged at orifices of the communicating pore passage, the valve rods are movably arranged in the communicating pore passage through the glands, in a gas pressurization stroke, the spherical structure of the check valve close to the high-pressure hydraulic cavity is jacked to the shrinkage cavity section of the communicating pore passage under the action of high-pressure hydraulic oil, the hydraulic oil enters the communicating pore passage through gaps of the glands and the valve rods and enters a cavity of the check valve close to the low-pressure hydraulic cavity through a flow passage in the check valve, and the spherical structure of the check valve close to the low-pressure hydraulic cavity is forced to be tightly attached to the gland where the check valve is located, the one-way valve close to the low-pressure hydraulic cavity is closed, the hydraulic cavities on the two sides of the connector are not communicated at the moment, at the tail end of the pressurization stroke, the piston in the low-pressure hydraulic cavity pushes the valve rod of the one-way valve close to the low-pressure hydraulic cavity to move, so that the one-way valve is opened, the two hydraulic cavities of the pressurization cylinder are communicated with the communication pore passage through the one-way valve, hydraulic oil in the high-pressure hydraulic cavity enters the unloading hydraulic cavity of the low-pressure hydraulic cavity through the one-way valve and the communication pore passage and returns through the hydraulic oil port communicated with the unloading hydraulic cavity, and the pressure relief of a hydraulic system is realized; the end-of-stroke damping device includes a needle valve for adjusting the size of the orifice of the damping pressure chamber.
Preferably, the stroke end buffering device comprises an adjusting hand wheel connected with the end of the needle valve.
Preferably, the number of the stroke end buffering devices is two, the two stroke end buffering devices are respectively used for blocking the buffering hydraulic cavities of the first cylinder barrel and the second cylinder barrel at the tail end of the supercharging stroke, and the buffering sleeve mechanism comprises two buffering sleeves which are respectively arranged on the piston rod in a sleeved mode and respectively attached to the inner side faces of the two pistons.
Preferably, a base is packaged at the bottom end of the first cylinder barrel, a top cover is packaged at the top end of the second cylinder barrel, two air holes are respectively formed in the base and the top cover, one air hole is an air suction hole, and the other air hole is an air exhaust hole.
Preferably, the inner circumferential surface of the connecting body is enclosed to form a hollow cylinder structure, and the hollow cylinder structure comprises a first hollow cylinder, a second hollow cylinder and a third hollow cylinder, wherein the diameters of the first hollow cylinder, the second hollow cylinder and the third hollow cylinder are gradually reduced and are concentrically arranged.
Preferably, the first hollow column, the second hollow column and the third hollow column are of an integrally arranged structure.
The invention at least comprises the following beneficial effects:
the invention discloses a self-pressure-discharging adjustable buffer gas pressure cylinder, wherein a low-pressure hydraulic cavity of the pressure cylinder is divided into two parts by a stroke tail end buffer sleeve: one part of the oil can be discharged outwards only through the throttling port of the adjustable needle valve, and the buffering effect of the inertia load of the pressure cylinder can be adjusted by adjusting the size of the throttling port of the needle valve; the other part is used for communicating a high-pressure hydraulic cavity and a low-pressure hydraulic cavity of the pressure cylinder so as to realize self-pressure discharging of a hydraulic system at the tail end of the stroke of the pressure cylinder and reduce hydraulic reversing impact. Compared with the existing gas pressure cylinder of the hydraulic compressor, the gas pressure cylinder of the hydraulic compressor can simultaneously realize the self-pressure relief of a hydraulic system at the stroke tail end of the pressure cylinder and the effective buffering of the inertia load of the pressure cylinder, has the obvious effects of reducing hydraulic reversing impact and inertia load impact, can effectively prolong the service life of the gas pressure cylinder, reduces the integral operation vibration and noise of the hydraulic compressor, and has higher engineering practical application value.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic perspective view of a self-discharging adjustable buffer gas pressurizing cylinder according to the present invention;
FIG. 2 is a schematic top view of the self-discharging adjustable buffer gas cylinder according to the present invention;
FIG. 3 is a schematic cross-sectional view of FIG. 2;
FIG. 4 is an enlarged schematic view of circle I in FIG. 3;
FIG. 5 is an enlarged view of circle II in circle 3;
FIG. 6 is a schematic top view of the self-discharging adjustable buffer gas cylinder according to the present invention;
FIG. 7 is a schematic cross-sectional view of FIG. 6;
FIG. 8 is an enlarged view of circle III of FIG. 7;
FIG. 9 is a schematic view of the structure of the linker;
FIG. 10 is a schematic cross-sectional view of FIG. 9;
FIG. 11 is a schematic perspective view of a connector;
FIG. 12 is a schematic perspective sectional view of the connecting body.
Description of reference numerals: 10. a base; 11. a first air-intake hole; 12. a first exhaust port; 20. a first cylinder; 31. a first piston; 32. a piston rod; 33. a second piston; 41. a first cushion collar; 42. a second cushion collar; 50. a linker; 501. a first hollow cylinder; 502. a second hollow cylinder; 503. a third hollow cylinder; 51. a first hydraulic oil flow passage; 510. a first hydraulic port; 52. a first hydraulic buffer port; 53. a communicating pore passage; 531. a first valve bore section; 532. a first hole shrinkage section; 533. a connecting channel; 534. a second hole shrinkage section; 535. a second bore section; 54. a second hydraulic buffer port; 55. a second hydraulic fluid flow passage; 550. a second hydraulic port; 61. a first check valve; 611. a first valve stem; 612. a first gland; 62. a second one-way valve; 621. a second valve stem; 622. a second gland; 711. a first adjusting hand wheel; 712. a first needle valve; 721. a first adjusting hand wheel; 722. a second needle valve; 80. a second cylinder; 90. a top cover; 91. a second suction hole; 92. a second vent hole; 100. a first air cavity; 200. a first hydraulic chamber; 330. an unloading hydraulic cavity; 340. a buffer hydraulic chamber; 400. a second air chamber.
Detailed Description
The invention is described in further detail below with reference to the drawings so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It should be understood that terms such as "first" and "second" as used herein do not have an absolute meaning.
Referring to fig. 1-5, the self-discharging adjustable buffer gas pressure cylinder provided by the present invention includes a first cylinder 20 and a second cylinder 80, wherein a slidable piston mechanism is coaxially installed inside the first cylinder 20 and the second cylinder 80, and the piston mechanism includes a piston rod 32 and pistons coaxially installed at two ends of the piston rod, which are named as a first piston 31 and a second piston 33; the rod cavity of the first cylinder 20 and the rod cavity of the second cylinder 80 are hydraulic cavities which are named as a first hydraulic cavity 200 and a second hydraulic cavity respectively, and the rodless cavity of the second cylinder 20 and the rodless cavity of the second cylinder 80 are air cavities which are named as a first air cavity 100 and a second air cavity 400 respectively. In the gas pressurization stroke, a hydraulic cavity communicated with a high-pressure hydraulic oil source of an external hydraulic system is a high-pressure hydraulic cavity, a hydraulic cavity communicated with an oil return pipeline is a low-pressure hydraulic cavity, referring to fig. 3, when external hydraulic oil enters a second hydraulic cavity through a flow passage on a connector 50, the second hydraulic cavity is a high-pressure hydraulic cavity, a first hydraulic cavity 200 is communicated with the oil return pipeline of the external hydraulic system through the flow passage on the connector 50, the hydraulic oil in the first hydraulic cavity 200 flows back to an external hydraulic oil tank, the first hydraulic cavity 200 is a low-pressure hydraulic cavity, a piston mechanism of a gas pressurization cylinder moves upwards, at the moment, a gas to be compressed is sucked into the first air cavity 100, and a target gas is compressed and discharged by the second air cavity 400; when the piston mechanism moves to the end close to the stroke, the stroke proximity switch installed in the connector 50 triggers the external electro-hydraulic directional control valve to act, external high-pressure hydraulic oil enters the first hydraulic cavity 100 through a flow channel on the connector 50, the first hydraulic cavity 100 is a high-pressure hydraulic cavity, the second hydraulic cavity 200 is communicated with an oil return pipeline of an external hydraulic system through the flow channel on the connector 50, the hydraulic oil in the second hydraulic cavity flows back to an external hydraulic oil tank, the oil return of the second hydraulic cavity is a low-pressure hydraulic cavity, the piston mechanism moves downwards, the first air cavity 100 compresses and discharges target gas at the moment, the second air cavity 400 sucks gas to be compressed, when the piston mechanism moves downwards to the end of the stroke, the other stroke proximity switch installed on the connector 50 triggers the external electro-hydraulic directional control valve to act, the piston mechanism moves upwards again, and the operation is repeated.
The gas pressurizing cylinder further comprises a buffer sleeve mechanism, a connecting body 50, a stroke tail end unloading device and a stroke tail end buffer device. Specifically, the buffer sleeve mechanism comprises a buffer sleeve which is sleeved on the piston rod 32 and is attached to the inner side surface of the piston, and the buffer sleeve is combined with the inner peripheral surface of the connecting body 50 to block the low-pressure hydraulic cavity into an unloading hydraulic cavity 330 and a buffer hydraulic cavity 340 at the tail end of the pressurization stroke of the gas pressurization cylinder; the connecting body 50 is internally provided with a communicating pore passage 53 communicating the high-pressure hydraulic cavity and the unloading hydraulic cavity 330, the stroke end unloading device comprises a pair of check valves which are oppositely arranged in the communicating pore passage 53, each check valve comprises a gland and a valve rod, the two glands are respectively arranged at the orifices of the communicating pore passage 53, the two valve rods are respectively movably arranged in the communicating pore passage 53 through the glands, the communicating pore passage 53 comprises two shrinkage sections which are oppositely arranged, in the gas pressurizing stroke, the check valve close to the high-pressure hydraulic cavity is jacked to the shrinkage sections of the communicating pore passage 53 under the action of high-pressure hydraulic oil, the hydraulic oil enters the communicating pore passage 53 through the gaps of the glands and the valve rods and enters a cavity of the check valve close to the low-pressure hydraulic cavity through a flow passage in the check valve, the ball surface structure of the check valve close to the low-pressure hydraulic cavity is forced to be tightly attached to the gland where the check valve is located, and the check valve close to the low-pressure hydraulic cavity, at the end of the pressurization stroke, a piston in the low-pressure hydraulic cavity pushes a one-way valve rod close to the low-pressure hydraulic cavity to move, so that the one-way valve is opened, the two hydraulic cavities of the pressurization cylinder are communicated with a communication pore passage through the one-way valve, hydraulic oil in the high-pressure hydraulic cavity enters an unloading hydraulic cavity 330 of the low-pressure hydraulic cavity through the one-way valve and the communication pore passage and returns oil through a hydraulic oil port communicated with the unloading hydraulic cavity, and pressure relief of a hydraulic system is realized; the stroke end buffering device comprises a needle valve, oil is discharged outwards through an adjustable throttling port of the needle valve, and the buffering effect of the inertia load of the pressure cylinder can be adjusted by adjusting the size of the throttling port of the needle valve; compared with the existing gas pressure cylinder of the hydraulic compressor, the gas pressure cylinder of the hydraulic compressor can simultaneously realize the self-pressure relief of a hydraulic system at the stroke tail end of the pressure cylinder and the effective buffering of the inertia load of the pressure cylinder, has the obvious effects of reducing hydraulic reversing impact and inertia load impact, can effectively prolong the service life of the gas pressure cylinder, reduces the integral operation vibration and noise of the hydraulic compressor, and has higher engineering practical application value.
Wherein the first check valve 61 comprises a first gland 612 and a first valve stem 611, and the second check valve 62 comprises a second gland 622 and a second valve stem 621.
Preferably, referring to fig. 3-8, in a preferred embodiment of the present invention, the gas pressurizing cylinder is a bidirectional gas pressurizing cylinder, the cushion sleeve mechanism includes a first cushion sleeve 41 and a second cushion sleeve 42, which are sleeved on the piston rod 32 and respectively abut against the inner side surfaces of the two pistons, the first cushion sleeve 41 separates the low-pressure hydraulic chamber (the first hydraulic chamber 200) into the unloading hydraulic chamber 330 and the cushion hydraulic chamber 340 at the end of the upward pressurizing stroke of the gas pressurizing cylinder, and the second cushion sleeve 42 separates the low-pressure hydraulic chamber (the second hydraulic chamber) into the unloading hydraulic chamber 330 and the cushion hydraulic chamber 340 at the end of the downward pressurizing stroke of the gas pressurizing cylinder.
Generally, referring to fig. 1, a base 10 is packaged at the bottom end of the first cylinder 20, a top cover 90 is packaged at the top end of the second cylinder 80, a first air suction hole 11 and a first air exhaust hole 12 are arranged on the base 10, and a second air suction hole 91 and a second air exhaust hole 92 are arranged on the top cover 90. The air suction hole is connected with the air suction one-way valve, and the air exhaust hole is connected with the air exhaust one-way valve.
Specifically, the connector 50 is provided with a first hydraulic oil port 510 for communicating a working oil port of the electro-hydraulic directional control valve with the hydraulic cavity of the first cylinder 20, and a second hydraulic oil port 550 for communicating the working oil port of the electro-hydraulic directional control valve with the hydraulic cavity of the second cylinder 80; specifically, the first hydraulic port of the connecting body 50 is communicated with the first hydraulic chamber 200 through the first hydraulic flow passage 51, and the second hydraulic port 550 of the connecting body 50 is communicated with the hydraulic chamber of the second cylinder 80 through the second hydraulic flow passage 55.
Specifically, referring to fig. 5, the communication duct 53 includes a first valve hole section 531, a first shrinkage section 532, a connecting hole section 533, a second shrinkage section 534 and a second valve hole section 535 which are sequentially communicated, wherein the first shrinkage section 532 and the second shrinkage section 534 are oppositely disposed, and the first shrinkage section 532 and the second shrinkage section 534 are both in a conical mesa structure. Referring to fig. 3 and 5, when high-pressure hydraulic oil enters the first cylinder 20 through the hydraulic oil port 510, the gas pressure cylinder piston mechanism moves downward, the second cylinder 80 hydraulic chamber is a low-pressure hydraulic chamber, the hydraulic oil therein flows back to the oil tank, the check valve 61 near the high-pressure hydraulic chamber is pushed into the shrinkage section 532 of the communicating pore passage under the action of the high-pressure hydraulic oil, the hydraulic oil enters the communicating pore passage through the gap between the gland and the valve rod and enters the chamber of the check valve 62 near the low-pressure hydraulic chamber through the internal flow passage of the check valve 61, the spherical structure of the check valve 62 near the low-pressure hydraulic chamber is forced to be attached to the gland where the check valve is located, the check valve 62 near the low-pressure hydraulic chamber is closed, the hydraulic chambers on both sides of the connector 50 are not communicated at this time, at the end of the pressure stroke, as shown in fig. 3, the piston 33 in the low-pressure hydraulic chamber pushes 621 of the check valve 62 near the low-pressure hydraulic chamber to move, the check valve 62 is opened, the two hydraulic cavities of the pressure cylinder are communicated with the check valve 62 through the check valve 61 and the communicating pore channel 53, and hydraulic oil in the high-pressure hydraulic cavity 200 enters the unloading hydraulic cavity of the low-pressure hydraulic cavity through the check valve and the communicating pore channel and returns through the hydraulic oil port communicated with the unloading hydraulic cavity, so that pressure relief of a hydraulic system is realized, and integral operation vibration and noise of the hydraulic compressor are effectively reduced.
Preferably, referring to fig. 7, the stroke end buffers are two in number, and include a first needle valve 712 communicating with the first cylinder hydraulic chamber for buffering at the end of the upward stroke of the gas pressurizing cylinder and a second needle valve 722 communicating with the second cylinder hydraulic chamber for buffering at the end of the downward pressurizing stroke of the gas pressurizing cylinder. The first needle valve 712 communicates with the hydraulic chamber 200 of the first cylinder 20 through the first hydraulic cushion port 52, and the second needle valve 722 communicates with the hydraulic chamber of the second cylinder 80 through the second hydraulic cushion port 54. Specifically, the ends of the first needle valves 712 are respectively connected with a first adjusting handwheel 711, the ends of the second needle valves 722 are connected with a second adjusting handwheel 721, and the sizes of the orifices of the needle valves are adjusted by rotating the adjusting handwheels. In other embodiments of the invention, the adjusting handwheel may also be realized as an adjusting handle.
The inner side surface structure of the connecting body 50 described with reference to fig. 9 to 12 is a hollow cylinder structure, the hollow cylinder structure includes a first hollow cylinder 501, a second hollow cylinder 502, and a third hollow cylinder 503, which are concentrically arranged with decreasing diameters, and the first hollow cylinder 501, the second hollow cylinder 502, and the third hollow cylinder 503 are integrally arranged. The cylindrical surface of the second hollow cylinder 502 is attached to the outer side surface of the buffer sleeve to separate the space between the cylindrical surface of the first hollow cylinder 501 and the cylindrical surface of the third hollow cylinder 503 to form an unloading hydraulic cavity 330 and a buffer hydraulic cavity 340 at the end of a pressurizing stroke.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of appropriate invention, and further modifications may readily be effected by those skilled in the art, whereby the invention is not limited to the details given herein and to the illustrations described herein, without departing from the general concept defined by the claims and their equivalents.

Claims (6)

1. The utility model provides an from adjustable buffer gas pressure boost cylinder of autogenous pressure, includes first cylinder and second cylinder, slidable piston mechanism is installed to first cylinder and the inside coaxial of second cylinder, piston mechanism includes the piston rod and locates the piston at its both ends, and the pressure boost cylinder has the pole intracavity to be filled with hydraulic oil, and no pole intracavity is full of gas, its characterized in that still includes:
the connecting body is provided with a first hydraulic oil port for communicating a working oil port of the electro-hydraulic reversing valve with the rod cavity of the first cylinder barrel and a second hydraulic oil port for communicating the working oil port of the electro-hydraulic reversing valve with the rod cavity of the second cylinder barrel;
the buffer sleeve mechanism comprises a buffer sleeve which is sleeved on the piston rod and is attached to the inner side surface of the piston, and the buffer sleeve is used for blocking the low-pressure hydraulic cavity into an unloading hydraulic cavity and a buffer hydraulic cavity by combining the inner side surface of the connecting body at the stroke tail end of the pressure cylinder;
the stroke end unloading device is characterized in that a communicating pore passage communicated with hydraulic oil cavities at two sides of the connecting body is arranged on the connecting body, a pair of check valves arranged in opposite directions are arranged in the communicating pore passage, each check valve comprises a gland and a valve rod, the two glands are respectively arranged at orifices of the communicating pore passage, the valve rods are movably arranged in the communicating pore passage through the glands, in a gas pressurizing stroke, under the action of pressure difference of the two hydraulic cavities, the check valve close to the high-pressure hydraulic cavity is opened, the check valve close to the low-pressure hydraulic cavity is closed, at the moment, the hydraulic cavities at two sides of the connecting body are not communicated, at the tail end of the pressurizing stroke, a piston in the low-pressure hydraulic cavity pushes the check valve rod close to the low-pressure hydraulic cavity to move, so that the check valve is opened, the two hydraulic cavities of the pressurizing cylinder are communicated with the communicating pore passage through the one check valves and return oil through a hydraulic oil port communicated with the low-pressure hydraulic cavities, the pressure relief of a hydraulic system is realized;
the stroke end buffering device comprises a needle valve and a pressure regulating valve, wherein the needle valve is used for regulating the size of an oil outlet of the buffer hydraulic chamber; an oil inlet of the needle valve is communicated with an oil outlet of the buffer hydraulic cavity, and an oil discharge port of the needle valve is communicated with the first hydraulic oil port or the second hydraulic oil port of the connector.
2. The self-discharging adjustable buffer gas booster cylinder of claim 1, wherein the end-of-travel buffer means comprises an adjusting hand wheel connected to the end of the needle valve.
3. The self-discharging pressure-adjustable buffer gas pressure cylinder according to claim 1, wherein the number of the stroke end buffers is two, and the stroke end buffers comprise needle valves for connecting the buffer hydraulic chambers of the first cylinder and the second cylinder, and the buffer sleeve mechanism comprises two buffer sleeves respectively sleeved on the piston rod and attached to the inner side surfaces of the two pistons.
4. The self-discharging pressure-adjustable buffer gas pressure cylinder according to claim 1, wherein a base is encapsulated at the bottom end of the first cylinder, a top cover is encapsulated at the top end of the second cylinder, the base and the top cover are respectively provided with an air suction hole and an air discharge hole which are communicated with an air cavity of the pressure cylinder, and the air suction hole and the air discharge hole are both connected with corresponding one-way valves.
5. The self-discharging adjustable buffer gas booster cylinder of claim 1, wherein the inner side of the connecting body is enclosed in a hollow cylindrical structure comprising a first hollow cylinder, a second hollow cylinder and a third hollow cylinder, which are concentrically arranged with decreasing diameter.
6. The self-discharging adjustable buffer gas pressure cylinder according to claim 5, wherein the first hollow cylinder, the second hollow cylinder and the third hollow cylinder are integrally formed.
CN202010857552.XA 2020-08-24 2020-08-24 Self-pressure-discharging adjustable buffer gas pressure cylinder Active CN111946587B (en)

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