CN103388604A - Hydraulic cylinder - Google Patents

Hydraulic cylinder Download PDF

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Publication number
CN103388604A
CN103388604A CN2012101391677A CN201210139167A CN103388604A CN 103388604 A CN103388604 A CN 103388604A CN 2012101391677 A CN2012101391677 A CN 2012101391677A CN 201210139167 A CN201210139167 A CN 201210139167A CN 103388604 A CN103388604 A CN 103388604A
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CN
China
Prior art keywords
seal ring
hydraulic cylinder
sealing
working
shape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012101391677A
Other languages
Chinese (zh)
Inventor
周承惠
周磊
张相安
张相新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING NIUXI HYDRAULIC TECHNOLOGY INSTITUTE
Original Assignee
BEIJING NIUXI HYDRAULIC TECHNOLOGY INSTITUTE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BEIJING NIUXI HYDRAULIC TECHNOLOGY INSTITUTE filed Critical BEIJING NIUXI HYDRAULIC TECHNOLOGY INSTITUTE
Priority to CN2012101391677A priority Critical patent/CN103388604A/en
Priority to PCT/CN2013/000511 priority patent/WO2013166854A1/en
Publication of CN103388604A publication Critical patent/CN103388604A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
    • F16J15/48—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings influenced by the pressure within the member to be sealed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/56—Other sealings for reciprocating rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/08—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction with expansion obtained by pressure of the medium

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Architecture (AREA)
  • Sealing Devices (AREA)
  • Actuator (AREA)

Abstract

The invention relates to a novel hydraulic cylinder with low medium leakage, long service life, reliable work and good stability. A compound seal system formed by an n-shaped seal ring and a combined sealing component is adopted to realize seal between a piston block and a cylinder body. Working medium pressure extrudes a seal ring body to expand outwards from the inner cavity of the n-shaped seal ring so as to realize real; and the higher the pressure is, the better the sealing effect is, so that medium leakage is greatly reduced, the sealing effect is good, and the working life is long. A sealing principle of the n-shaped sealing ring is that the working medium pressure is self-dynamically balanced, the processing accuracy of a column body is not needed to be increased since the n-shaped seal ring is adopted, and the working condition of the combined sealing component in the compound seal system cannot be affected at all, so that the hydraulic cylinder has double sealing effects of the n-shaped seal ring and the combined sealing component. Compared with the existing hydraulic cylinder, the novel hydraulic cylinder has the advantages and characteristics of low medium leakage, good sealing effect, long working life, reliable and stable working conditions, and the like.

Description

A kind of oil hydraulic cylinder
Technical field
The present invention relates to a kind of hydraulic machinery, specifically a kind of novel hydraulic cylinder.Belong to machinery manufacturing technology field.
Background technique
As everyone knows, existing oil hydraulic cylinder, O shape circle, Yx shape circle and combined sealing component sealing technique are adopted in its piston motive sealing for a long time.In the rubber seal sealing techniquies such as O shape circle, Yx shape circle, working medium pressure makes it be adjacent to corresponding sealant surface and realizes sealing from seal ring external compression sealing circle body, seal element with the seal relative movement in be easy to be damaged, very easily produce dielectric leakage.While due to O shape circle, Yx shape, enclosing the class seal ring by assembling, extrusion-deformation generation prestressing force reaches sealing effect, and seal ring is in deformation state for a long time, easily produces permanent deformation and loses elasticity, can not keep good sealing effect the long period.Because the elastic material yield rate is low, the seal elements such as O shape circle, Yx shape circle can produce distortion simultaneously, and medium passes through and mistake, seal failure.So the pipe pressure height, all do not need a rigid material ring set supporting element.Combined sealing component grows up on class seal ring basis at O shape circle, Yx shape circle in recent years, combined sealing component is in fact with seal rings such as the O type circle of rigid material ring set support ring alienation and Yx types, the combined sealing component sealing mechanism encloses with O shape, Yx shape circle elastomeric material Sealing sealing mechanism is basically all the same, exist the dielectric leakage problem always, sealing effect is not very good yet, can not anti-very high pressure; With the Sealings such as O shape circle, Yx shape circle, the same wild effect that produces because of the rigid material support ring that there will be equally; Existing oil hydraulic cylinder easily produces dielectric leakage, and reliability, stability are low, and operating life is short.Particularly when using two above combined sealing components simultaneously, be actually the quantity that has increased the rigid material support ring, require machining accuracy high, increased the manufacturing difficulty of processing of main frame, cause existing oil hydraulic cylinder cost significantly to rise.
Summary of the invention
Purpose of the present invention be exactly to provide a kind of dielectric leakage low, long service life and reliable operation, stable novel hydraulic cylinder.
Invention thinking of the present invention is:
The compound seal system that adopts n shape seal ring and combined sealing component to form between between the piston block of novel hydraulic cylinder and cylinder body realizes sealing.
Concrete technological scheme of the present invention is:
Be provided with at least one n shape seal ring and at least one combined sealing component on the hydraulic cylinder piston piece; The piston block end is provided with port hole in order to be communicated with n shape seal ring mounting groove, and port hole communicates with a plurality of n shape seal ring mounting grooves or a port hole communicates with a n shape seal ring seal ring mounting groove.The compound seal system that n shape seal ring, port hole and combined sealing component form realizes the piston block of oil hydraulic cylinder and the sealing between casing wall.
Advantage of the present invention and benefit:
The compound seal system that oil hydraulic cylinder of the present invention has adopted n shape seal ring and combined sealing component to form, working medium pressure outwards expands and realizes sealing from n shape seal ring inner chamber crush seal circle body, more the high sealing effect is better for pressure, thereby can greatly reduce dielectric leakage, good sealing effect, long working life.N shape seal ring sealing mechanism is working medium pressure oneself dynamic balancing, adopt n shape seal ring not need to increase the cylinder machining accuracy, on the working condition of the combined sealing component in the compound seal system without any impact, so oil hydraulic cylinder of the present invention has the double seal effect of n shape seal ring and combined sealing component.Compare the excellent characteristics such as have that dielectric leakage is low, good sealing effect, long working life, working condition are reliable, stable with existing oil hydraulic cylinder.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings:
Fig. 1, Fig. 2, Fig. 3 are the reciprocal two-way hydraulic cylinder cut-away views that adopts the compound seal system of n shape seal ring 5, port hole 4 and various combined sealing component 6 compositions;
Fig. 4 is the buffering hydraulic cylinder cut-away view that adopts the compound seal system of n shape seal ring 5, port hole 4 and combined sealing component 6 compositions;
Fig. 5 is the one-way hydraulic cylinder cut-away view that adopts the compound seal system of n shape seal ring 5, port hole 4 and combined sealing component 6 compositions;
Fig. 6 is the main cut-away view of n shape seal ring 5;
Fig. 7 is the side cut-away view of n shape seal ring 5;
Embodiment:
Can find out from Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, be provided with at least one n shape seal ring 5 mounting groove and at least one combined sealing component 6 mounting groove on hydraulic cylinder piston piece 3, n shape seal ring 5, combined sealing component 6 just are arranged on separately in the seal ring mounting groove; The end face of hydraulic cylinder piston piece 3 has some port holes 4 and each n shape seal ring peace 5 to put groove to be connected.Port hole 4 can share, and also can separate separately.
N shape seal ring 5 working surface inboards in Fig. 6, Fig. 7 and the both sides of seal ring form hollow cavity, and at least one boss 8 is arranged on the sealed working face of n shape seal ring 5, due to n shape seal ring 5 sectional shapes like n shape, therefore be called n shape seal ring.
Can find out from Fig. 1, Fig. 2, Fig. 3, back and forth two-way hydraulic cylinder piston block 3 has at least one n shape seal ring 5 mounting groove and at least one combined sealing component 6 mounting groove near two end faces, and n shape seal ring 5, combined sealing component 6 just are arranged on separately in the seal ring mounting groove; The both ends of the surface of piston block 3 have some port holes 4 and lead to each road n shape seal ring 5 mounting grooves, medium can be imported the inner chamber of n shape seal ring 5, make in the seal ring inner chamber and have been full of medium.After oil hydraulic cylinder is started working, when pressure strengthens, pressure medium is reached the inner chamber of n shape seal ring 5 via port hole 4 by medium, make the working surface close contact of n shape seal ring 5 and cylinder body 2, boss 8 on n shape seal ring 5 working surfaces and the working surface close contact of cylinder body 2 form labyrinth seal, medium by the time pressure progressively decay, less than the pressure medium in the inner chamber of n shape seal ring 5, medium can not occur pass through leakage phenomenon, obtain fabulous sealing effect.And pressure medium is larger, and the working surface laminating of n shape seal ring 5 sealed working faces and cylinder body 2 is tighter, and sealing effect is fine.Due to n shape seal ring 5 inner chamber hollows, wearing and tearing and little in working stroke; And in the inoperative stroke, between sealing circle body and cylinder body 2, friction slightly, is worn and torn very little.Simultaneously, pressure medium is to push internally n shape seal ring 5 sealing circle bodies to realize sealing, whole rubber seal uniform stressed under the extruding of pressure medium, and deformation is very little, can not produce permanent set, and n shape seal ring 5 operating lives have obtained prolongation.Because sealing force in n shape seal ring 5 inner chambers directly comes from working medium pressure, so the working medium pressure in n shape seal ring 5 inner chambers is in self-dynamic balancing at any time during host work, do not affect the working condition of combined sealing component 6 in the compound seal system, realized double seal.Oil hydraulic cylinder of the present invention not only operating life is multiplied, and dielectric leakage is low, and, good stability more reliable than existing hydraulic cylinder works.
Buffering hydraulic cylinder in Fig. 4, piston are also two way sealeds, can use separately, also can be as the cylinder part of hydraulic bjuffer.Reciprocal two-way hydraulic cylinder in its working condition, structure and Fig. 1, Fig. 2, Fig. 3 is identical, and the compound seal system owing to adopting n shape seal ring 5, port hole 4 and combined sealing component 6 to form, realized double seal.Compare with existing buffering hydraulic cylinder, hydraulic bjuffer, buffering hydraulic cylinder of the present invention has long working life, and dielectric leakage is low, the excellent characteristics such as reliable operation, good stability.
In Fig. 5, novel one-way hydraulic cylinder is one-way sealing, also is provided with Returnning spring 7 in cylinder body, is usually used in the hydraulic cylinder part of the equipment such as Manual hydraulic cutter, hydraulic pressure draw-bar.Different with the reciprocal two-way hydraulic cylinder in Fig. 1, Fig. 2, Fig. 3 on structure, hydraulic cylinder piston piece 3 has at least one n shape seal ring 5 mounting groove and at least one combined sealing component 6 mounting groove near working medium one end end, and n shape seal ring 5, combined sealing component 6 just are arranged on separately in the seal ring mounting groove.The close working medium one end end face of piston block 3 has some port holes 4 and leads to each road n shape seal ring 5 mounting grooves, medium can be imported the inner chamber of n shape seal ring 5, makes in n shape seal ring 5 inner chambers and has been full of medium.When working pressure strengthens, pressure medium is reached the inner chamber of n shape seal ring via port hole 4 by medium, make the working surface close contact of n shape seal ring 5 and cylinder body 2, boss 8 on the working surface of n shape seal ring 5 and the working surface close contact of cylinder body 2 form labyrinth seal, medium by the time pressure progressively decay, less than the pressure medium in the inner chamber of n shape seal ring 5, medium can not occur pass through leakage phenomenon, obtain fabulous sealing effect.And pressure medium is larger, and the sealed working face laminating of n shape seal ring 5 working surfaces and cylinder body 2 is tighter, and sealing effect is fine.Due to the compound seal system that adopts n shape seal ring 5, port hole 4 and combined sealing component 6 to form, realized double seal, compare with existing Manual hydraulic cutter, hydraulic pressure draw-bar, in employing the present invention, the one-way hydraulic cylinder is made Manual hydraulic cutter, the hydraulic pressure draw-bar long working life of cylinder body, dielectric leakage is low, reliable operation, good stability.
Industrial application
Compound seal system because novel hydraulic cylinder of the present invention has adopted n shape seal ring 5, port hole 4 and combined sealing component 6 to form, reduce dielectric leakage greatly, obtains good sealing effect, and long working life, have the good technology capability such as reliable, stable.This clearly demarcated oil hydraulic cylinder is compared with existing oil hydraulic cylinder, has that dielectric leakage is low, good sealing effect, long working life and reliable operation, excellent characteristics such as stable.

Claims (2)

1. oil hydraulic cylinder,, by formations such as piston block (3), cylinder body (2), piston rod (1), n shape seal ring (5), combined sealing components (6), it is characterized in that: between piston block (3) and cylinder body (2), sealing adopts the compound seal system that n shape seal ring (5), port hole (4) and combined sealing component (6) form to realize.
2. oil hydraulic cylinder according to claim 1, it is characterized in that: at least one n shape seal ring (5) and at least one combined sealing component (6) are arranged on piston block (3), and piston block (3) end is provided with port hole (4) in order to be communicated with n shape seal ring (5) mounting groove.
CN2012101391677A 2012-05-07 2012-05-07 Hydraulic cylinder Pending CN103388604A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2012101391677A CN103388604A (en) 2012-05-07 2012-05-07 Hydraulic cylinder
PCT/CN2013/000511 WO2013166854A1 (en) 2012-05-07 2013-05-06 Hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012101391677A CN103388604A (en) 2012-05-07 2012-05-07 Hydraulic cylinder

Publications (1)

Publication Number Publication Date
CN103388604A true CN103388604A (en) 2013-11-13

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Application Number Title Priority Date Filing Date
CN2012101391677A Pending CN103388604A (en) 2012-05-07 2012-05-07 Hydraulic cylinder

Country Status (2)

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CN (1) CN103388604A (en)
WO (1) WO2013166854A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111771064A (en) * 2018-02-28 2020-10-13 Smc株式会社 Seal structure in fluid pressure cylinder and fluid pressure cylinder

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890849A (en) * 1983-05-17 1990-01-02 James Walker & Company Limited Shaft seals
CN101435509A (en) * 2007-11-15 2009-05-20 北京纽希液压技术研究所 n type seal device
CN101451615A (en) * 2007-12-05 2009-06-10 北京纽希液压技术研究所 N shaped composite sealing device
CN101482179A (en) * 2008-01-08 2009-07-15 北京纽希液压技术研究所 Multi-n shaped sealing device
CN101482180A (en) * 2008-01-08 2009-07-15 北京纽希液压技术研究所 Multi-n shaped combined sealing device
CN101532523A (en) * 2008-03-12 2009-09-16 北京纽希液压技术研究所 Novel hydraulic cylinder
CN201606335U (en) * 2009-05-26 2010-10-13 北京纽希液压技术研究所 Novel hydraulic cylinder
CN101893014A (en) * 2009-05-19 2010-11-24 北京纽希液压技术研究所 Hydraulic cylinder
CN201779265U (en) * 2010-08-13 2011-03-30 北京纽希液压技术研究所 Novel air cylinder
CN202012621U (en) * 2011-01-14 2011-10-19 北京纽希液压技术研究所 Composite sealing device
CN202756333U (en) * 2012-05-07 2013-02-27 北京纽希液压技术研究所 Hydraulic cylinder

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SU1196580A1 (en) * 1984-06-22 1985-12-07 Красноярский Политехнический Институт Hydraulic cylinder packing
CN87216568U (en) * 1987-12-17 1988-08-10 张方 Compound sealed piston
CN2366598Y (en) * 1998-08-19 2000-03-01 李祥龙 'C' type sealing means for piston
CN1904416A (en) * 2005-07-25 2007-01-31 周承惠 Inner cavity medium pressure self compensated composite sealing ring
CN102588608A (en) * 2011-01-14 2012-07-18 北京纽希液压技术研究所 Compound sealing device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890849A (en) * 1983-05-17 1990-01-02 James Walker & Company Limited Shaft seals
CN101435509A (en) * 2007-11-15 2009-05-20 北京纽希液压技术研究所 n type seal device
CN101451615A (en) * 2007-12-05 2009-06-10 北京纽希液压技术研究所 N shaped composite sealing device
CN101482179A (en) * 2008-01-08 2009-07-15 北京纽希液压技术研究所 Multi-n shaped sealing device
CN101482180A (en) * 2008-01-08 2009-07-15 北京纽希液压技术研究所 Multi-n shaped combined sealing device
CN101532523A (en) * 2008-03-12 2009-09-16 北京纽希液压技术研究所 Novel hydraulic cylinder
CN101893014A (en) * 2009-05-19 2010-11-24 北京纽希液压技术研究所 Hydraulic cylinder
CN201606335U (en) * 2009-05-26 2010-10-13 北京纽希液压技术研究所 Novel hydraulic cylinder
CN201779265U (en) * 2010-08-13 2011-03-30 北京纽希液压技术研究所 Novel air cylinder
CN202012621U (en) * 2011-01-14 2011-10-19 北京纽希液压技术研究所 Composite sealing device
CN202756333U (en) * 2012-05-07 2013-02-27 北京纽希液压技术研究所 Hydraulic cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111771064A (en) * 2018-02-28 2020-10-13 Smc株式会社 Seal structure in fluid pressure cylinder and fluid pressure cylinder

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Application publication date: 20131113