CN105864146A - Single-acting cylinder with in-cylinder return reset gas spring - Google Patents
Single-acting cylinder with in-cylinder return reset gas spring Download PDFInfo
- Publication number
- CN105864146A CN105864146A CN201610261443.5A CN201610261443A CN105864146A CN 105864146 A CN105864146 A CN 105864146A CN 201610261443 A CN201610261443 A CN 201610261443A CN 105864146 A CN105864146 A CN 105864146A
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- Prior art keywords
- cylinder
- acting cylinder
- return
- acting
- gas spring
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Classifications
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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
- 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
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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
- 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
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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
- 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
- F15B15/1457—Piston rods
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The energy consumption return of a conventional double-acting cylinder is quite close to energy consumption of a working stoke, and energy waste is extremely serious, while, as for a conventional single-acting cylinder which returns and resets through utilizing a spring, a reset spring occupies a relatively large axial space, so that the longitudinal dimension of the cylinder body is too large, materials are wasted, the structure is heavy, and the stroke is greatly restrained. The invention provides a single-acting cylinder forming a return reset gas spring through utilizing in-cylinder gas capacity. When the single-acting cylinder is used for replacing the conventional double-acting cylinder, the energy saving effect is extremely remarkable; and the single-acting cylinder is used for replacing the conventional single-acting cylinder, and has the advantages that the longitudinal dimension of the cylinder body is small, the weight is light, the stroke is not restrained, and the like. The single-acting cylinder with the in-cylinder return reset gas spring is a novel pneumatic actuating element which can be applied to related areas in the society, and is energy-saving and environment-friendly to use, high in production efficiency and high in universality degree.
Description
Technical field
The present invention relates to cylinder field, relate generally to a kind of utilize air-capacitor in cylinder to form the single-acting cylinder of return reset gas spring.
Background technology
At present, the quantity that double-acting cylinder is applied in social each field, considerably beyond single-acting cylinder.But, there is a very important economic indicator problem, ignored by vast majority of people for a long time: the energy of double-acting cylinder backstroke waste, the most serious！
Why return waste energy is extremely serious for existing double-acting cylinder, is that diameter of piston rod d is too small with piston diameter D ratio, and big-and-middle-sized cylinder d/D ratio is generally about 20%.This results in the maximum reverberation matrix method of cylinder, and the maximum force being in close proximity to its impulse stroke (sets pneumatic actuator system rated pressure as p, cylinder operation stroke maximum force F1=πD2P/4, maximum reverberation matrix method F2=π(D2-d2)p/4；The ratio of the two is F2/F1=(D2-d2)/D2=[D2-(0.2D)2)]/D2=0.96=96%).But, return hydraulic cylinder only needs to overcome the frictional force at relative motion position, and the required return power caused because of this frictional force, the most all at impulse stroke maximum force F1=πD2Within the 10% of p/4, low rubbing cylinder even can be accomplished within 1%.Therefore, the backstroke of existing big-and-middle-sized cylinder, there is the biggest power redundancy, and power redundancy i.e. means energy dissipation.
It addition, according to cylinder power consumption computing formula E=pV, it is also possible to reflect the situation of existing double-acting cylinder serious waste energy.If cylinder range is L, cylinder rodless cavity volume V1=πD2L/4, rod chamber volume V2=π(D2-d2)L/4；The ratio of the two is V2/V1=(D2-d2)/D2=[D2-(0.2D)2)]/D2=0.96=96%.It means that the return power consumption of existing big-and-middle-sized cylinder, up to about the 96% of impulse stroke power consumption.And overcome the energy needed for the frictional force of relative motion position, the most only within the 10% even 1% of impulse stroke power consumption, substantial amounts of energy is fallen by unnecessary waste.
From the point of view of in terms of energy overall utilization, current pneumatic gearing system effectiveness is about about 20%, and Hydraulic Power Transmission System efficiency is about 40%, and the former is only about the half of the latter.At this on the one hand, the power consumption waste of double-acting cylinder return is huge, is the most key influence factor.
The biggest reverberation matrix method redundancy of traditional double active cylinder existence and energy dissipation, the not only unnecessary consumption energy, but also the biggest back stroke impact power and sound pollution can be produced.Generally, on the end cap of existing double-acting cylinder, it is required for arranging the buffer unit that structure is very complicated, and diverter valve outlet is required for installing deafener additional.This improves manufacturing cost the most accordingly.
In view of the backstroke of double-acting cylinder, power consumption is too much and waste is serious, therefore, for large-scale and super-huge cylinder, replaces double-acting cylinder with single-acting cylinder, has obviously energy-saving effect.Because relative to double-acting cylinder, the power consumption of single-acting cylinder return is little, even can accomplish not consume energy on concept of engineering.This is because, the return power of single-acting cylinder, is the potential energy that make use of back-moving spring to be compressed in cylinder operation stroke and put aside, it is only necessary to overcome the frictional force at cylinder related seals position.This frictional force, the least relative to the specified power output of cylinder, engineering calculation is negligible completely.
But, there is following critical defect in existing single-acting cylinder: (one) back-moving spring is solid matter material manufacture, it is generally required to occupy the axial space of rod chamber about 50%, therefore, and 2 times of the cylinder body length of existing single-acting cylinder, about double-acting cylinder.Owing to cylinder body length is long, causing consumable material too much, population structure is heavy.(2) need to occupy axial space due to back-moving spring, cause existing single-acting cylinder, both can not accomplish that longitudinal size was the least under little travel condition, such as super-thin air cylinder；Impossible stroke is the longest, such as ultralong-stroke cylinder again.(3) the minimum return power of back-moving spring, it is impossible to be adjusted according to the concrete frictional force of every cylinder, choose and there is bigger blindness.To be on the safe side, engineer often chooses excessive spring return power, thus causes certain uneconomical factor.
Incidentally, Chinese invention patent application number is a kind of single-acting thrust cylinder of 201410260757.4, although can make super-thin air cylinder, but can not make Long travel cylinder, and structure is complicated.
The big-and-middle-sized cylinder of existence due to disadvantages mentioned above so that single-acting cylinder, particularly single-acting, the number of applications in social each field, far away not as good as double-acting cylinder, thus cause substantial amounts of energy waste.
Summary of the invention
It is an object of the invention to, overcome existing spring potential energy reset single-acting cylinder population structure heavy, and the shortcoming of existing double-acting cylinder return serious waste energy, innovative design goes out the single-acting cylinder that a kind of overall dimension and weight are suitable with double-acting cylinder, for society's relevant field a kind of energy-saving and environmental protection of offer, novel pneumatic executive component that generalization degree is high.
For reaching above-mentioned purpose, the innovation scheme that the present invention uses is: a kind of have the single-acting cylinder of return reset gas spring in cylinder, and its piston rod is hollow form, forms bar content cavity between piston, piston rod；Described bar content cavity cavity volume outer with bar is interconnected and to outside relative closure, forms air-capacitor in cylinder；In described cylinder, air-capacitor is filled with and maintains the compressed gas for return, forms return reset gas spring.
Due to the utilization of above-mentioned innovation scheme, the present invention has the advantage that compared with existing cylinder
1, cylinder of the present invention, in utilizing cylinder, air-capacitor forms return reset gas spring, owing to gas is non-solid material, need not take up any axial space, almost without weight, replace existing spring return homing position type single-acting cylinder with it, it is possible to notable shortening cylinder body longitudinal size, save material, reduce weight；Replace existing double-acting cylinder with it, it is possible to realize the most energy-conservation, be remarkably improved cylinder and use the economic benefit of enterprise.
2, cylinder of the present invention is under little travel condition, can make super-thin air cylinder as existing double-acting cylinder；And the diameter of the hollow form piston rod of the present invention and rigidity, the solid piston bar of more existing cylinder has had and has increased substantially, thus can make ultralong-stroke cylinder.It is to say, the present invention expands the range of application of single-acting cylinder the most significantly, and improve the function of double-acting cylinder, existing single-acting and double-acting cylinder can be replaced comprehensively, there is the highest generalization degree.
3, cylinder of the present invention is in impulse stroke, there is air-capacitor back pressure all the time, do not have compressed air to discharge in rod chamber, so not producing outlet noise, robust motion is good, little to the impulsive force of drive end bearing bracket；Additionally, the return thrust of backstroke is less, pretend the impulsive force being used on cylinder rear end cap the least.Therefore, the buffer unit on cylinder front and back ends lid and corresponding deafener, typically can be omitted or simplified, thus reduce manufacturing cost.
4, the return thrust of the return reset gas spring of cylinder of the present invention, can be according to the actual frictional force size of concrete cylinder, the pressure of air-capacitor in cylinder when adjusting and determine return, it is possible to accomplish the return power redundancy of minimum.This point, is the single-acting cylinder of existing spring reset return, in any case also do not accomplish.
It should be strongly noted that the return reset gas spring in cylinder of the present invention, with existing gas spring, such as nitrogen spring etc., it is essentially different.Existing gas spring, such as nitrogen spring etc., is a relatively independent packaged unit, cannot use in cylinder interior at all.And the return reset gas spring in cylinder of the present invention, it is to utilize air-capacitor self-assembling formation in cylinder, it is not necessary to occupy any axial space.
Accompanying drawing explanation
The present invention is a kind of, and to have the structure principle chart of the single-acting cylinder of return reset gas spring in cylinder as follows, and wherein Fig. 1 is impulse stroke state, and Fig. 2 is backstroke state.
In figure, 1, piston；2, piston rod；3, bar content cavity；4, the outer cavity volume of bar；5, air-through holes 6, two position three way directional control valve 7, pressure switch.
Detailed description of the invention
Accompanying drawing 1 and 2 is that the present invention has a specific embodiment of return reset gas spring single-acting cylinder in cylinder.Below, in conjunction with this specific embodiment, technical scheme is further elaborated.
The operation principle of single-acting cylinder specific embodiment of the present invention is: the piston rod 2 of cylinder is hollow form, forms bar content cavity 3 with piston 1；The outer cavity volumes 4 of self-assembling formation bar such as piston 1, piston rod 2 and cylinder body；Piston 1 and the junction of piston rod 2, be provided with air-through holes 5 so that bar content cavity 3 cavity volume 4 outer with bar realizes intercommunication；The bar content cavity 3 of intercommunication cavity volume 4 outer with bar, realizes due to piston 1 and the sealing structure of piston rod 2, to outside relative closure, forming air-capacitor in cylinder；In cylinder, air-capacitor is filled with and maintains the compressed gas for return, forms return reset gas spring.
When two position three way directional control valve 6 is in the work of the most left position, cylinder is impulse stroke, enters compressed air in its rodless cavity, promotes piston 1 to move right with piston rod 2；Needing according to return power and determining the compressed gas of pressure in the outer cavity volume 4 of bar, by air-through holes 5, part flows into bar content cavity 3；During Gai, according to the state equation p of ideal gas1V1T1=p2V2T2, in cylinder, air-capacitor pressure gradually increased.But owing to the volume of bar content cavity 3 is significantly greater than the outer cavity volume 4 of bar, volume, so the amplitude that pressure increases is not the biggest.Owing to back pressure improves, gas spring acts on the return power of piston right side and also increased.
When two position three way directional control valve 6 switches to the work of right position, the rodless cavity of cylinder leads to air, the compressed gas for return in bar content cavity 3, and by air-through holes 5, part flows into the outer cavity volume 4 of bar；Gas spring acts on the return power on piston 1 right side, promotes piston 1 and piston rod 2 to left movement, carries out return reset.During Gai, according to the state equation p of ideal gas1V1T1=p2V2T2, in cylinder, air-capacitor pressure gradually decreases, but reduction amplitude is not the biggest.As shown in Figure 2.
In cylinder, air-capacitor is filled with and maintains the control device of return compressed gas, can have many kind technical schemes, and it will not go into details the most as space is limited.No matter cylinder is under which kind of duty, as long as the pressure of air-capacitor in cylinder, when being less than, because of reasons such as leakages, the minimum pressure that pressure switch 7 adjusts, control system will send signal, and compressed air will be filled with air-capacitor in cylinder from outside.And once air-capacitor pressure reaches the maximum pressure that pressure switch 7 adjusts in cylinder, control system can send signal again and stop inflation.Due to the active force of the return reset gas spring that air-capacitor in cylinder is formed, according to the actual frictional force of each cylinder, pressure switch 7 can be carried out on-the-spot adjustment, it is possible to reduce return active force redundancy to greatest extent.This point, be the existing single-acting cylinder of spring reset return, may not accomplish.
Requiring particular attention is that, be inflated air-capacitor in cylinder, being usually to supplement leakage, its number of times is little.
By accompanying drawing 1,2 it can be seen that except piston rod 2 is in addition to hollow form, the present invention has the single-acting cylinder of return reset gas spring in cylinder, similar with the structure of existing double-acting cylinder.So under conditions of cylinder body longitudinal size is identical, the two stroke is the same.But the present invention has the single-acting cylinder of return reset gas spring in cylinder, and return power consumption is little, or does not consumes energy；And the power consumption of existing double-acting cylinder return is consumed energy close to impulse stroke.Therefore, using the present invention to have the single-acting cylinder of return reset gas spring in cylinder, replace existing double-acting cylinder, energy-saving effect is the most notable.Additionally, due to inventive piston bar 2 is hollow form, the solid piston bar of its diameter and the more existing cylinder of rigidity has had and has increased considerably, and is convenient to make ultralong-stroke cylinder.
Certainly also it is not difficult to analyze, by the present invention, there is the single-acting cylinder of return reset gas spring in cylinder, replace existing spring return homing position type single-acting cylinder, can not only significantly shorten cylinder body longitudinal size, reduce construction weight, and can make super-thin air cylinder as existing double-acting cylinder under little travel condition.
Only from structure principle chart, perhaps many people will be considered that, the present invention has the manufacturing cost of the single-acting cylinder of return reset gas spring in cylinder, can be higher than existing double-acting cylinder, and practical situation is the most really not so.This is because, existing double-acting cylinder, front and rear cover is required for arrange the buffer unit that structure is very complicated.And cylinder of the present invention, there is return air-capacitor back pressure due to impulse stroke all the time, and the power of backstroke is less, so the buffer unit on cylinder front and rear cover, it is convenient to omit or simplify.So its comprehensive manufacturing cost, instead existing double-acting cylinder can be less than.Additionally, cylinder of the present invention is in impulse stroke, in rod chamber, do not have compressed gas to discharge, do not produce noise, a deafener can be saved.
Above-mentioned specific embodiment, using piston rod assembly is moving parts, but according to same invention thinking, naturally it is also possible to design the double acting energy saving cylinder that piston rod assembly is fixed, housing assembly moves.
Above-described embodiment is simply to illustrate that the innovation thinking of the present invention and technical characterstic, but protection scope of the present invention is not limited to above-mentioned specific detailed description of the invention.All various equivalence changes carried out according to innovation thinking essence of the present invention and technical characterstic or the equivalent structure change etc. of the modification of locality, particularly piston rod assembly, all should contain within protection scope of the present invention.
Claims (1)
1. one kind has the single-acting cylinder of return reset gas spring in cylinder, it is characterised in that: piston rod is hollow form, forms bar content cavity between piston, piston rod；Described bar content cavity cavity volume outer with bar is interconnected and to outside relative closure, forms air-capacitor in cylinder；In described cylinder, air-capacitor is filled with and maintains the compressed gas for return, forms return reset gas spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610261443.5A CN105864146A (en) | 2016-04-26 | 2016-04-26 | Single-acting cylinder with in-cylinder return reset gas spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610261443.5A CN105864146A (en) | 2016-04-26 | 2016-04-26 | Single-acting cylinder with in-cylinder return reset gas spring |
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| Publication Number | Publication Date |
|---|---|
| CN105864146A true CN105864146A (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610261443.5A Pending CN105864146A (en) | 2016-04-26 | 2016-04-26 | Single-acting cylinder with in-cylinder return reset gas spring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356904A (en) * | 2018-12-03 | 2019-02-19 | 江苏丰东热技术有限公司 | A kind of automatic reciprocating air cylinder and automatic reciprocating air cylinder system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3813021A1 (en) * | 1988-04-19 | 1989-11-02 | Guenther Hahn | Gas spring |
| CN202140369U (en) * | 2011-07-05 | 2012-02-08 | 平顶山市碧源科技有限公司 | Single-acting cylinder |
| CN102418724A (en) * | 2011-11-04 | 2012-04-18 | 武汉工程大学 | Adjustable impact cylinder |
| CN102536957A (en) * | 2012-02-24 | 2012-07-04 | 苏州大学 | Pneumatic/hydraulic cylinder with buffering mechanism |
| CN205715062U (en) * | 2016-04-26 | 2016-11-23 | 苏州普来可瑞机电技术有限公司 | A kind of have the single-acting cylinder of return reset gas spring in cylinder |
-
2016
- 2016-04-26 CN CN201610261443.5A patent/CN105864146A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3813021A1 (en) * | 1988-04-19 | 1989-11-02 | Guenther Hahn | Gas spring |
| CN202140369U (en) * | 2011-07-05 | 2012-02-08 | 平顶山市碧源科技有限公司 | Single-acting cylinder |
| CN102418724A (en) * | 2011-11-04 | 2012-04-18 | 武汉工程大学 | Adjustable impact cylinder |
| CN102536957A (en) * | 2012-02-24 | 2012-07-04 | 苏州大学 | Pneumatic/hydraulic cylinder with buffering mechanism |
| CN205715062U (en) * | 2016-04-26 | 2016-11-23 | 苏州普来可瑞机电技术有限公司 | A kind of have the single-acting cylinder of return reset gas spring in cylinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356904A (en) * | 2018-12-03 | 2019-02-19 | 江苏丰东热技术有限公司 | A kind of automatic reciprocating air cylinder and automatic reciprocating air cylinder system |
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Application publication date: 20160817 |