CN1884833B - Peristaltic pump - Google Patents
Peristaltic pump Download PDFInfo
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- CN1884833B CN1884833B CN2005100815056A CN200510081505A CN1884833B CN 1884833 B CN1884833 B CN 1884833B CN 2005100815056 A CN2005100815056 A CN 2005100815056A CN 200510081505 A CN200510081505 A CN 200510081505A CN 1884833 B CN1884833 B CN 1884833B
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- blade
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- spiral
- pump
- sebific duct
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- 230000002572 peristaltic effect Effects 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 230000033001 locomotion Effects 0.000 claims abstract description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 5
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- 230000015572 biosynthetic process Effects 0.000 claims description 2
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- 238000000354 decomposition reaction Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
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- 238000005086 pumping Methods 0.000 claims 1
- 230000009711 regulatory function Effects 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 6
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- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a novel mechanical pump, which is revolutionary design in the peristaltic pump field, and especially meets the demands of low noise and low cost, especially suits to be used in devices such as an analyzer and a micro robot and the like, as well as occasions where the conveyed flow is completely isolated from the objects other than pipelines to ensure the purity or safe surrounding environment in the medical treatment, pharmacy, diet, chemical industry, nuclear energy, spaceflight, environmental protection and automatic control fields. The invention starts from biomimetic thinking, simulates the peristaltic worm to the utmost, uses a mechanism of a screw shaft and blade strings to finish a motion switch between 'rotation and straight', thereby obtaining the pump function. Because the structure of the invention is very simple, so that the size of the product is small, the manufacture and maintenance cost are low, and the adaptability to the operational environment is strong. Thus the mechanical pump of the invention further widens the application range of the peristaltic pump, and is hopeful to apply to some daily civil occasions.
Description
Technical field
The invention belongs to mechanical pump, it is a kind of novel peristaltic pump, the fluid that can be widely used in being transferred must be isolated to guarantee its occasion pure or guarantee surrounding environment safety, for example: fields such as analytical instrument, medical apparatus, medical industry, food_beverage industry, chemical industry, nuclear power industry, aerospace industry, environmental protection and automatic control fully with the object beyond the pipeline.
Background technique
Existing peristaltic pump roughly is attributable to two classes, and a class is to adopt on arc-shaped rail with the link up form work of roll extrusion silicone tube of a plurality of rolling wheel set; Another kind of then is to adopt the multistage polyphone of crankshaft ﹠ connecting to form the directed relay of silicone tube is pushed.But the former noise is big, efficient is low, and the latter's structure is relative complex, cost height again.Therefore, their application all has been subjected to certain restriction.
About second class, also once occurring some both at home and abroad utilizes multistage bent axle directly to promote each crushing plate, or control a plurality of relays by computer program and come order to promote crushing plate extruding sebific duct and the design of pump liquid, even also occurred as documents 1 (WO2004/033903A2) and documents 2 (US5924852A), crushing plate is made thin blade, allow a lot of blades be close together and form the form that corrugated profiles is come driving pump liquid by bent axle; Its structure is progressive to some extent comparatively speaking, but also remarkable, has the eccentric cam of segmentation on their live axle, or with directly being linked to be spiral helicine camshaft (or claiming bent axle) after the cam mutual dislocation; Must have simultaneously the thing of step, guide rail guide groove and so on to be used for assist location on blade face, their structure is still quite complicated, and part processing requires accurately, and manufacture cost is still very high.
Summary of the invention
With respect to domestic and international various prior aries, the present invention is a kind of new design with breakthrough progress of peristaltic pump.The present invention is from bionical thinking point of view, do one's utmost to imitate the caterpillar of wriggling, use a smooth continuous screw axis to add the mechanism of rectangular paddle string, in the casing that matches, utilize the two dimension of power to decompose the motion converter of finishing ' rotation---straight line ', thereby obtain the function of pump; It does not have in the prior art those cam cranks, guide groove guide rail and step of also adopting or the like device fully, construct tersely and ingenious, can satisfy the requirement of low cost, low noise especially.
Because structure of the present invention is very simple, make that the volume of product is little, make and maintenance cost is low, the adaptability of working environment is strong.Therefore will further widen the application area of peristaltic pump, be highly suitable for analytical instrument, portable medical apparatus, and use in the equipment such as microrobot, and be expected to enter some daily civilian occasion.
Structure of the present invention and working principle are seen (figure one).After mainly being made up of a screw axis (10) and tens slim vane (20) that are stacked on the axle, wherein so-called driving mechanism is placed on work in the casing with matching (30).
The screw axis (10) that is contained on the casing front and rear wall axis hole is rotated by the motor drive, order about and be through top blade string (20s) motion, because blade center all has one and is wider than slightly that the screw axis material is straight to be slightly larger than the external diameter of whole spiral and the slotted hole of upper and lower settings (201) through, its length, the outside dimension of blade in height just is limited in again can not moving up and down between the last lower wall of casing simultaneously; And the thickness that tens blades stack up just equals length empty in the casing front and rear wall, therefore can not swing.Obviously, when screw axis rotated, every blade just can only side-to-side movement.If overlook from above, their limit, two ends, the left and right sides will form two parallel sinusoidal curves, and wavy ground advances vertically.If pass in the gap of silicone tube between blade end limit and casing limit wall at this moment allow, it is suitable to need only the gap, and silicone tube (70) will be by the compacting of go-ahead blade crest and pump liquid.During actual the manufacturing, this gap must be regulated, in advanced development of the present invention be between sebific duct and tank wall again bolster a cushion block (40), and this cushion block can be conditioned screw (403) and regulates.
Description of drawings
Figure (one)---the working principle of driving structure of the present invention
Figure (two)---the projection of screw axis on lower wall on the casing and the formula of slender degree
Figure (three)---the boundary dimension of blade
Figure (four)---the casing of experimental prototype
Figure (five)---dismountable movable side wall
Embodiment
Design and the main points of making
One) screw axis
1, material and shape:
Screw axis (10) is made with the even wire rod with certain intensity and circular cross-section, it can be metal, also can be high-intensity nonmetal, pay the utmost attention to the alloy silk that uses stainless steel and so on, be to adopt the electric furnace heating wire of original φ 1.0 to process such as experimental prototype;
The helix that is processed into, its pitch is long, the spiral shell footpath is little, be basically a shed repair long, middle equal diameter but be the spring that drawing of pagoda shape loose at two ends.Is dextrorotation or left-handedly need not restriction as for whole axle,, but just must select one need be the time with respect to the direction of the axially loaded of live axle because can also be by changing the direction that turns to control pump liquid that drives square.Blade points to anti-drive end to the axial reaction thrust that screw axis applies when preferably making its work, can be more convenient because install the thrust device of bearing, pellet shot from a slingshot or other form additional at this end.Because power is very little, in experimental prototype, do not adorn any special thrust device, directly by cooperating to come thrust between front end and back end tank wall and the screw axis.
Yet screw axis ' slender ' actually should consider that to what degree following Several Factors designs:
At first, we define slender degree Sd and are: Sd=T/A
In the formula: T---the pitch of helix; The amplitude of oscillation of A---helix, i.e. spiral external diameter.
The projection of screw axis on lower wall on the casing should be two convergent sinusoidal curve, sees (figure two).
At work, when blade be in worst position on the screw axis, promptly as in (figure two) during those of ω=n π, if Sd equals π, then the angle that screw axis and blade constituted is 45 degree, after its power F that imposes on blade decomposes, pressure Fi that pushes mutually forwards, backwards and the power Fu that does useful work to the left and right will equate; If Sd is much larger than π, then Fu will be much larger than Fi, and this is that we are desirable, because Fi only can generate the frictional force between the blade, makes overall efficiency reduce, even can't work.Consider that from this point Sd is the bigger the better; And under the identical situation of the amplitude of oscillation, Sd is big more, and the length of the pump housing is long more, and the speed of pump liquid, power are big more, and certainly, the rigidity of axial wood is also big more.Simultaneously, the pump housing is long more, and under the identical situation of vane thickness, the sheet number of blade increases, and the sheet number is many more, and formed envelope sinusoidal curve is slick and sly more, this working life to blade or sebific duct is all favourable.But because the restriction Sd of cost and technology can not be too big, Sd=6.3 in experimental prototype is about 2 π.
When considering Material Selection and processing technology thereof, the intensity of its resiliently deformable when the yield strength of its crooked deformation of back that must guarantee to be shaped should be much larger than compacting sebific duct inwall, because a side is that steel, a side are sebific ducts, so this is not difficult to accomplish.And this also starting point of the present invention thinking just.
If want normal pump liquid, isodiametric that section screw axis must have the more than one cycle, but in order to keep the screw axis both sides preferably got more than 1.5 by equilibrium of forces as far as possible, just is about 1.5 T in experimental prototype;
If the pulsation of flow velocity in the time of will avoiding pump liquid, must make two pagoda shape springs at two ends, each cycle in the axial length that might touch sebific duct makes silicone tube be connected mutually with the pump liquid speed of isometrical spiral section fully at the progressive formation of inlet/outlet place pressurized and release also greater than 1.Experimental prototype is less than 1, so flow velocity owes surely, and this does not influence use in many instances certainly.
The diameter of spiral has determined the amplitude of oscillation of blade, but because the matching gap that exists between axle and the blade makes the latter less than the former, the amplitude of oscillation is got final product greater than sebific duct internal diameter maximum in the sebific duct of pump housing defined use.Should leave certain leeway during actual design, experimental prototype is about 3mm, and the silicone tube internal diameter of installing is 1.4mm, changes the also useful of 2.0mm afterwards into.
2, processing
As previously mentioned, though the shape of screw axis is uncomplicated, during manual advanced development and bad processing, can be by calculating, first coiling goes out one section big, short spiral, and then it is elongated realize.Can pay the utmost attention to the automatic torsion machine processing of using computer programming during batch process.
3, device
Monolateral stressed for fear of live axle, sebific duct should be provided with symmetrically on the both sides of blade simultaneously, even the device on single channel liquid road also can allow sebific duct return to pass operated in series connection again one time at opposite side; Or idle sebific duct of one section same model is set at opposite side again; Perhaps make the form of two-way parallel operation, be to allow the stressed of spiral both sides cancel out each other on the whole, to alleviate the burden of bearing and drive motor in a word as far as possible.And the operated in series connection mode can improve the pressure of pump liquid, and parallel operation then can increase flow, reduce pulsation.
Two) blade
1, material:
In order to reduce frictional loss, blade can select for use with axle, with tank wall material surface friction coefficient materials with smaller when matching, resiliently deformable intensity when its rigidity needs only much larger than the silicone tube compacting, temperature accommodation is wider than by pump liquid temperature and ambient temperature and is got final product, for example engineering plastics, brass etc.Experimental prototype is to adopt discarded phone IC-card to process.
2, shape and processing:
The blade profile size is as (figure three), be four jiaos of rectangles that very little chamfering or fillet are arranged, central authorities have a long strip hole, are easy to form with plate die sinking punching press or computer carving, bar hole length is for slightly being longer than the external diameter of isometrical section spiral of screw axis, and blade is at height.That is to guarantee on the width of blade itself at the bar hole two ends that blade edge pulls it self other half pulling force along also leaving enough wide material to bear, and consider that the whole wide silicone tube that is greater than of blade shrivels later width and gets final product, unsuitable wide, the wide waste that will cause material, boundary dimension and mechanical efficiency several respects; Same reason, blade is not too long on the length of itself, but can not lack very much, too short conversion and transmission with influence power, make simultaneously sebific duct and axle from too near, structurally give manufacturing and use two aspects all to bring difficulty, advise that its length-width-ratio is 1～2: choose in 1 the scope.The Elongation that experimental prototype adopts is 1: 1;
Aspect processing, tangible punching press burr or other technology burrs can not be left at least along all very little chamfering being arranged in its bar shaped endoporus and outer periphery; If the pump housing of machining large, blade are also correspondingly thicker, this moment its long strip endoporus long edge can relatively be particular about according to carrying out the chamfer machining of curved surface with the stressed angle of screw axis point of contact.In microminiature pump, the chamfering of this curved surface will form automatically by the break-in of axle and blade.
3, quantity
The quantity of blade is that empty length deducts behind the very little free gap divided by vane thickness in the casing.Under the fixing situation of empty length, vane thickness is thin more, the sheet number is many more in slender degree Sd and casing, and formed sinusoidal curve is smooth more, help prolonging working life of silicone tube more.But, manufacture cost also can correspondingly increase.Can find a suitable coefficient according to the reaction in market during batch process.
It in experimental prototype (24.4-0.6) ÷ 0.72=33 sheet
Three) casing
The casing of experimental prototype is as (figure four), by front and back end plate (401); Wainscot (402), lower wall panels, (403) and left side plate (404) are formed.
Front and back end plate central authorities leave axis hole or bearing saddle bore (4011); Two the waist circular ports (4012) that allow sebific duct walk that have of suitable distance symmetry are left on the bearing hole both sides
Lower wall panels is as the substrate of the whole pump housing of assembling, except forming the rectangular box with end plate, side plate, also considered and being connected of drive motor seat, and reserved the position of mounting hole of complete machine.
Wainscot length is exactly the length of casing, has reserved the long strip window (4021) that the loading and unloading cushion block is used on width;
The nut (4044) that two adjusting screw (4043) and tightening thereof are used is housed on every block of side plate
Four) axle and being connected of motor
When assembling, screw axis must have been gone here and there and allowed its two ends pass from bearing hole again behind all blades, therefore the axle beginning at two ends must keep straight, in the manufacturing of miniature and small pump, can blade with again the drive end of axle is processed into suitable shape after casing has been assembled after be connected with motor drive shaft.Exactly it is bent to suitable shape in experimental prototype, directly being enclosed within micro motor has and works on the flat side's of Milling the shaft extension.If can not guarantee that diaxon is concentric fully, can on cooperating, reserve certain clearance; When making the pump of big shape, can not after having assembled blade and casing, process live axle again, so must above bearing hole, slot and install bearing support briquetting (4013) additional; Perhaps use various appropriate shaft joints.The use of shaft joint can also change the direction of live axle, makes things convenient for the installation of motor under the special occasions.Shaft joint has a lot of ready-made products can supply to utilize.
Five) dismountable movable side wall
Actual product can also be shown in (figure five), and the member (50) that employing can be for convenience detach forms the sidewall of casing.Have fixedly buckle (501), movable card article (502) on the member (50) and be used for the adjusting play, the centre accompanies the cushion block press strip multi-layer structure of silica gel strip, this structure can be regulated in advance, the maximum stress during in order to control blade extruding sebific duct.
Device is during sebific duct, as long as by adjusting screw (505) with the silica gel strip between cushion block and the press strip (506) compress slightly, make between cushion block (503) and the press strip (504) to answer elastic force just to be compacted required pressure than the silicone tube of working in advance more bigger; And the working clearance between cushion block and the blade string (20s) is adjusted to the specification that is suitable for this silicone tube by adjusting screw (507); After silicone tube (70) set, fixedly buckle (501) on the member is inserted in the fixed groove (511) corresponding on the upper and lower wall, depress whole member, after treating that movable card article (502) is rebounded, buckles into corresponding bayonet socket (512) by the U-shaped spring, tightening loading and unloading nuts (508) gets final product, working clearance this moment will be at one's best automatically, and the V-arrangement opening of end wall and movable press strip end just in time forms a pair of suitable sebific duct folder simultaneously.The process that such structure can make loading and unloading or change sebific duct becomes fast, simple, the usability of raising product is widened application area greatly.
Six) sebific duct only moves
If do not do any processing, sebific duct all may occur climbing slowly moving with respect to the pump housing when all peristaltic pumps were worked.One of available following way is prevented:
1, the relatively large pump housing can install the sebific duct folder additional near casing end wall place at input, the output terminal of sebific duct, the sebific duct folder also can be formed by the end (as 509,510 among the figure five) of band V-arrangement opening on front and back end wall and the movable side wall, and the diameter in formed pipe clamp hole should be slightly less than the external diameter of sebific duct after sidewall installed;
2, allow sebific duct one, two joint of wrestling like a cork mutually outside the outlet of output and input, just can overcome to climb and move, this method has been used for model machine, confirm feasiblely, though very unrefined and standard, being applied in some little, miniature pump of often not changing sebific duct also is a very simple and practical method.
Seven) drive
The AC and DC motor the same with most of peristaltic pumps of existing technology, that the worm pump can the various low speed of adapted also can be dragged to realize numerical control work by stepper motor.
Claims (12)
1. peristaltic pump, it comprises: at least one cover is by a helical live axle and be enclosed within this and go up the driving mechanism that many blades of closely being stacked mutually form, the casing that cooperates with driving mechanism; Described live axle can be constrained in the front and back end wall of casing pivotally; Described blade is in front and back, be constrained between the front and back end wall and last lower wall of casing on two dimensions up and down, but can swing; Two sections same silicone tubes pass between the end face of wall box and blade string in both sides simultaneously, comprise also that between sidewall and sebific duct one can be regulated it with respect to the gap of silicone tube, the cushion block of pressure, described sidewall, cushion block or substituted by a kind of detachable block with regulatory function; The technical characteristics of this peristaltic pump is: the driving mechanism of being addressed is extremely simple, without any mechanisms such as common cam or the bent axle that is linked to be by cam segment, connecting rod pin, slide bar sliding sleeve or guide rail guide grooves; The profile of described helical live axle is exactly one section helical spring that has excessively elongated, and its surface is even, continuous, smooth, and the cross section equates everywhere; The profile of described blade is except that having one in the centre in order to be exactly the simple rectangular tab of a slice basically the long strip perforate of passing described live axle, without any step and projection; Described driving mechanism is in the casing of coupling, by the two dimension decomposition of the power that end wall and last lower wall participate in simultaneously before and after the casing is arranged, can be directly change the rotation motion of above-mentioned live axle into blade swing, make blade string both sides end face form the sebific duct pumping fluid that the corrugated profiles of advancing is pushed both sides.
2. the peristaltic pump of addressing as claim 1, it is characterized in that the width of described rectangular paddle and casing up and down the height between tank wall be slidingly matched, the thickness of blade is that empty length deducts behind the little free gap of trying one's best sheet number divided by whole string blade in the casing; The length of described strip perforate is slightly larger than the spiral shell footpath of screw axis, makes that described blade can be with its length direction swing in the hole when screw axis rotates; The width in described strip hole only is slightly larger than the maximum oval major diameter that screw axis material itself is cut by blade plane, makes described blade have to swing on the width direction in hole with it when screw axis rotates; The shape of described slotted hole such as is taken as at the long strip of width, also can be the long oval shape that width suitably changes to some extent.
3. the peristaltic pump of addressing as claim 1, the shape that it is characterized in that described live axle is the long spiral of a shed repair, one section profile in middle at least 1.5 cycles is the isometrical cylindrical spiral of slender degree Sd much larger than π, the pitch of Sd=spiral/spiral external diameter wherein, two ends can be the spiral shell footpath and receive little pagoda spring shape gradually; Its material is the uniform and smooth circular cross-section material in surface, and the intensity of material is the resiliently deformable intensity of yield strength during at least greater than the compacting of sebific duct inwall that shapes its crooked deformation of back.
4. as claim 1,2 or 3 peristaltic pumps of addressing, the pagoda spring shape spiral that it is characterized in that described live axle two ends, the cycle of every end its pagoda spring shape spiral in the axial length that might touch sebific duct is also greater than 1, make silicone tube become a progressive formation that is connected mutually with the pump liquid speed of isometrical spiral section, the pulsation of flow velocity in the time of eliminating pump liquid effectively with discharging at the pressurized at inlet/outlet place.
5. as claim 1,2 or 3 peristaltic pumps of addressing, the material that it is characterized in that described blade for match with screw axis and when matching certainly little, the rigidity of surface friction coefficient much larger than the material of the resiliently deformable intensity of silicone tube; Can be various engineering plastics or metallic material; The quantity of described blade is for getting its upper limit as wide as possible in the scope of technology and cost permission.
6. the peristaltic pump of addressing as claim 5 is characterized in that the quantity of described blade is taken as more than 10 times of number of spiral week, so-called all numbers here be with empty length in before and after the casing divided by the pitch of equal diameter spiral section calculate all numbers.
7. as claim 1,2 or 3 peristaltic pumps of addressing, it is characterized in that the blade string is that blade by two kinds of different materials is alternate and assembles, in order to reduce frictional loss.
8. the peristaltic pump of addressing as claim 1, it is characterized in that having a casing that matches with driving mechanism dimensionally, when the sidewall of described casing when being fixed, then between sidewall and sebific duct, also be provided with one in order to regulate it with respect to the gap of silicone tube and the cushion block and the corresponding controlling mechanism of pressure.
9. peristaltic pump as claimed in claim 1, it is characterized in that the fixed sidewall of its casing and cushion block with a kind of can dismounting, can also regulate top clearance simultaneously; Predeterminable blade maximum extrusion pressure; Can and the V-arrangement opening of casing front and rear wall end between form the movable sidewall that size self adaption sebific duct only moves folder and replace, this movable sidewall makes that loading and unloading sebific duct becomes very convenient, quick.
10. as claim 1,2,3,8 or 9 peristaltic pumps of addressing, it is characterized in that to install thrust ball bearing at the two ends of live axle; Perhaps only at the other forms of thrust device of anti-drive end end device.
11., it is characterized in that described other forms of thrust device is a hard baffle plate or a steel ball as the peristaltic pump that claim 10 is addressed.
12. as claim 1,2,3,8 or 9 peristaltic pumps of addressing, wherein: in the relatively large pump housing, the long edge in the long strip hole of described blade can be processed into the curved surface chamfering that a kind of angle when each point contacts with screw axis with it respectively adapts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100815056A CN1884833B (en) | 2005-06-25 | 2005-06-25 | Peristaltic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100815056A CN1884833B (en) | 2005-06-25 | 2005-06-25 | Peristaltic pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1884833A CN1884833A (en) | 2006-12-27 |
| CN1884833B true CN1884833B (en) | 2011-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100815056A Expired - Fee Related CN1884833B (en) | 2005-06-25 | 2005-06-25 | Peristaltic pump |
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| Country | Link |
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| CN (1) | CN1884833B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104121172B (en) * | 2014-07-28 | 2016-08-24 | 深圳市赛特罗生物医疗技术有限公司 | A kind of cell culture fluid straight line peristaltic pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2453296A1 (en) * | 1974-11-11 | 1976-05-13 | Dieter Von Zeppelin | Pump for medical appln.eg. blood transfusion, - comprises elastic-walled enclosed space conveying element with support and motor-driven pump element |
| CN2208937Y (en) * | 1994-11-02 | 1995-10-04 | 李鸿德 | Creep pump |
| US5924852A (en) * | 1996-03-12 | 1999-07-20 | Moubayed; Ahmad-Maher | Linear peristaltic pump |
-
2005
- 2005-06-25 CN CN2005100815056A patent/CN1884833B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2453296A1 (en) * | 1974-11-11 | 1976-05-13 | Dieter Von Zeppelin | Pump for medical appln.eg. blood transfusion, - comprises elastic-walled enclosed space conveying element with support and motor-driven pump element |
| CN2208937Y (en) * | 1994-11-02 | 1995-10-04 | 李鸿德 | Creep pump |
| US5924852A (en) * | 1996-03-12 | 1999-07-20 | Moubayed; Ahmad-Maher | Linear peristaltic pump |
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| Publication number | Publication date |
|---|---|
| CN1884833A (en) | 2006-12-27 |
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