CA2073775A1 - Pump - Google Patents

Abstract

Abstract A pump (10) has a pump housing (11) forming a cylindrical chamber (15), in which an eccentric (16) that can be rotary operated by means of a drive shaft. Said eccentric causes a hose (20) wound around a ring (25) to be squeezed shut on the housing inner wall (11') by means of a flexible ring (25), arranged around said eccentric. A medium is conveyed peristaltically by rotating the eccentric (16). In addition, the hose (20) is continuously enclosed and enables discharge pressures ranging from 6 this pump (10) even at higher discharge pressures ranging from 6 to 10 (bar).

Description

. 207377~
r~

The in~entior, relltee to a pUlhp Comprisirlrl a pump housln~ torming a cylindrical chamber ~n eccentric that can be rotar~ operated in s~i d pump housing, and a hose that i~ disposed between said eccentric and pump honsinq and containing ~ medium to be cDn~eyed anrl that is squee~ed ~n the housing inner wall by the ec~ntric and with wt-,irh the medium in the hose ia cor-veyed peri~te~l t:ically~

pump of the described cl.-~ss is ~nown from the CH-P5 411 $82 where ~mall quantities of liquid~ for es:ample chlorinated liquid~
e-lr-e conveyed into e~ swimming pool. ~în elastic~lly fles:ible hose is l?uided~almost t~ice aroun~ a roller~ which is disposed on a be~rinr~ of an eccentric ~ha4t. Owing to the rot.~ry uper~tion of th0 ~h~ft. tl-,e roller is moved alon~ an eccentric path and thus the t-,ose is squee~ed to~ether loc~lly, where the shell of the roller lies the clo~est at the inner ~l~ll of a pressure element in the hl3u~ing. Thu~ liquid in the hose is pumped from an inlet in the direLtion of an outlet~ Owing to the p}anned free space around the hose said hose can absorb only a relatively low pre~-3ure (1 to 2 bar;, otherwise it would 5wel l and woul~ burst premaltur01y upon re.-lching the bursting pres~ure. rn ~ddition~
pr~cki~al ~p~rience h~s ~ho~n that when ~aid hose is pl~ce~d directly on the roller (eccentric)~ the hose make-3 ~
uncuntroll.-~bI~ kumbling movement, which can lead to sinniflci~nt disturb~nces or even to the un~ervice~blen~ss of the pump.

In contra~t, the object of the pre-aerlt invention i~, to impro~e pump of the aforemerltioned cl~s-3 in such a m~nner that 41~wless ~ction i~3 obt~ined wjth said pump .~t significantly higher possible operating pres~ure ~nd, in so cioing, a lonq ser~ice life- -is oht~int-.d with the instaJled hose.

This problem iC7 sol~ed t~ith the 1nvention ln that~ on ~he one h~nd, thr3 hose within the pLImp housing is enclosed continuoLIsly~
whrlreby medla o~ ~11 kinds can be con~eyed t~Jith ra~s~d pressure, i.e. 6 to iC~ bar. On the other hand, ~ fl0~cible ring, which is di-3posed between the hose and the eccentric and is made ;;

~R
" , , .. ~ . , .

207377~
pr-kferr~tlv of 5everal partsy en~bler~ th~t the hoc3e i5 n~ longer s~lbjectF-~d to tum~linq and additionc~lly inrl~ea;e~a the servl~e life of t:he hor~e if rhe rin~ comprises preferahly r;everal parts, the ring rS parts c.ln compri-3e. accor-ding to the invention~ rollerc, which are c~r-ranqed cctncentr-i~all~ to the eccentric~ and segments, which r~re diip~sed betweert 5~i. d roller~ .~nd have apprctximately the same thic~ne~c~5~ or compri~e onlv seQrnentC~ or- only roller~s.

The hO5e i 5 9Ui ded adYar-tttgeously within the pLImp housing in a windincl around the eccentric r~nd the ends of said hose should be bent off appros:imateLy radially nr axially to~Jard the out~ide and form the inlet and uutlet of the pump ~hile being arranged ~ide-by-ri de~ bL~t separateLy frDm a wail In addition, preferc-,bly the inlet to outlet shall be arranqed in r~lch a manner that the c~elf-rotatirlg eccentric equee~es hl~t moment~rily Ltoth ends dL~ring the transition of its squee~ing sh~t from the outlet to the inlet-sided region of the hose. In this manner the pump can be driven without use of nonreturn valves.

So that the hose does not bend too severely during the inle~ or outl.:t c.peration, the ring r*s:hibits a wedge--shaped filler, which prrajeL-t~ bet~e~n the hose mounted on the inlet and oL~tlet side ~nd which 1~ macJe preferably of an el~stic ~aterial.

The cros~ ~3ection of thEA hose i'3 advant~geously rect,~ngular. The rr~sult ir~ an especi.~lly gcJod sha~pe ir, the squeezed together state th~n with a Gonventi-Jn~l rour~d r-lo~e cross sectiDny this in turn 13e-~dc~ to an increease tn ~ervice lif E of the hose, ~Jhich is severely strained in any event For exarr,ple, it can ~e made of a silicone material.

EmbrJdimeti~s ~f the in~ention ~r-e es pl~ineci ln detailed ~Jlth the aicl of the drr~ing~ ln tne tollo~Jill~

f:igur~ J i~ a top ~iew of a pUmp of the ~nvention.

Figore 2 i~ r.t cross ;ectional view of thE pLImp according to ~-, ~

' I=i gure 1.

F:iyure !; and FIQ~re ~ are enlarqeri crn~s cection~11 viewq o~ a hose of thr* p~lmp act:ordirlc~ tc.~l-i.qL1re ly fir-st in the unlc~aded anrJ
erondly in the squ_e~.ed shut state.

Fig~ e 5 and Figure ~ .~re top vieWc c~f two other de-3igr,~ Ot a p.
Figure ~ is p~rti~l ;ectional view ~f an inlet and outlEt .~;i.ded h~e ~arranqement~

Figure 1 anct Fiqure ~ C.how a pump l~:j with a pump hoosiny 11, ~hich has a cut,stantiallv cy1indrical outer ~hape and can t~e attactled ~Jith ccr-ew-3, ~or example, to a commercially av~il~ble electric motor ~nnt ~ho~n in c~etail)~ The dri~Je qha+t 1L~ of the ~,otr.jr projer:ts into the interior of the pump ho~qin~ co~er 1~ i-3 attached additionally nn the front side with the aforementionecJ ~crews 1~ to the pump housing. In thi-.3 manner a cylindrical chamber 15 i5 formed in the interior of ttle housing 117 in which an eccentric 16 sitting snugly on the drive sh~ft 1-~can be rot~ry oper~ted with a roller bearing 16 flxed on 5ai~
eccer,tric~ ~Jhereas the inner rlng of the roller bearinq 1~
desi~ned ~J a hall bearin~ ~an be rotated ~lith the eccentric, ~'.5 outer ri.ng stands virtually ~till.

On the one hand, a ho~e ~C~ disposed in the cylindrical ch~mber IS
i~ enclc~.~3ed~ according to the ir,vention, continuously by pump housin~ 11 anci, on the other hand, a ~:lexible rinc :~J5, which encloses internally the ho~e ~O, i~ arranged hetween thiC~ hose ~.C~ ar,d the eccentri.c 1~. In -30 doin~, the ring ~5 compr~--e-~rollers ~61 which are arran~ed concentrically to the eccentr~ic ic, e-~nd e~re distr-ibuted at .irltr-srvals of ~ each o~er lte circumference .l~i' ', ~nd se~lments. which lies int~ett~Jeen ~nd l"hlrh are apprr~xime-~tely the saine t:hicknee~s ag the rr.llerc, . S r~nd r-~:hihit r~undirlq~ ~7' adapted on tt-,e front e~ide to t~le rollr r--~e-,nd eSlCJte3 27' ' ~ for tt~ rpr.~s.e o4 inr rec3Y,ing their radlal fleS~ibility. rhe rol:lers e~ are made clf e;teel whereas the .
segmente~, 27 are made o~ plasti~

.5 . . . ,, -- , .

, 207377~
.
The hose ~C~ ic; ~LIi ded within the hou~i r,g ll ir-l a wi ndi ng a~ our,d the eccentr~ S or the rinq 25. ~n prinriplr ~3aid ho!3e c~uld ~lso t.e woun~ into two or mQre wi ndi n-3~3 around the eccent~ic~ Ht 1:h~ end of the winding the ho~e ends r~ re bent off outw~lrdly ~ppro~:imately ~c-di~ nd arranged side-by-side, whereby a wall 2~ 3epar~te~ the ends of the hose. They f~rm the inlet r21 or ~tlet 22 of the pump.

H wed~e-sh~ped filler 2~ attached tr.~ or re-3tin~ or-, the ring "'~7 en~ble~ a not tDo severe bending of the hose en~s 2;1 , a fr.~ature with which in turn c~n increaS3ed service life of the nose i 5 targeted. In addition, its cont~ct surfares with the hnse are provlded with ~ radius and the filler c~n ~e moved on the said l~ls~
~. .
Cou~ling elementS3 lnot illustr~ted in detail) for ~onnecting lir,e~ or hoS3e~, the latter with an optionally ~einforced desiqn, c~n ~e provided on thls inlet 21 ~nd outlet 22.

During op0r~tirJn of the pump 1~1, the drive shaft 14 and thus the eccentric 16 rotate in the direction shown 14 at ~ specific epeed, wherehy the direction of rotation c~n be reYersed just as ell, ~t fe~ture thc-~t is c~nother advantage o4 this pump. The ~elf-r~t~ting eccent.ric 1~ causes ~t this stage by means of the flexi~le rin~ 1~ on the outer r09ion, which is the furthe~t away from the ~riYe shaft 14~ ~ ,queezin9 ~hut ~f the hose .CI.~In the manner of a peristGtlic action, the medium to be conveyed is now pumped in the direction of the Dutlet 2~ ~t the s~me time the hose Z~, t~Jhich upen~ again aft.er the squee2ing shut oper~tion, suck~ medium .again from the inl~t 21. If at ~hi~ ~t,a~e the ~qur~ezing shut shifts ln the direction o~ the outlet Z2 ar,d.
moreD~Jer~ ehange~l U~Jer to t.he inlet 21, the ho~e ~C~ i~, thereby~
arr~nged in such a mann,er from the inlet to the outlet that moment~riLy bbth hoee ends ~ are squee~ed sh~t, thu-- no nor,-r-eturn ~lve ~eing necessary on either the inle~. nor t:~he utl~t ~ide. Thi~ mamentary sq~leezing ~hut of both ho~e ~nds s~' ~an be o~tained flawle~sly~Jlth the elastic rie~,ign of,t.he tiller ~ ;~

With thi~ pump according to the invention, an aperational ~ ;

~:_11 , ' ' . , . '!
'~' , . ' ':

, ' ' ' . ' ~ ' :' '' .
- . , . ... '` :`` . `-:: ; , ' `' ' ` `, ~ : ' lii-ch~r~e pre~sure of ~, to 1~) bar ~an be ohtained. It i~
especiallf suitable ta conVeY food or slmilar medlc-, where cont~ct with the p.~rt~ of the pl~mp should be avoided. Seen from thi~ point of view1 the p~n~p is t-~lso quite suit~ble in me~icine~
~ec~use with it the mr*cii~ can l3e5 conveyed t~bsolutely sterilely.
Gti~e~, liquids or e~en st31ids can be conYeyed with this pump.
F~lrthermL3re,-it 1~- al~o e~pecially well suited in the chemical cer:tor, ~Jherr* ~-l tiirect cont~ct of the medium with the part~ of the pU!hp should ~it~o he ~oided, a~, for e~ample for ~ery ~ggressi~e or reactive medi~

~ccording to Figure 3, the hose 20 i5 approximatel~f rectt~nr~ular, it~ longer sidf restiny on the ring 25. ~dvt~nt~geoL~sly the hose '~Ci ' ', whi ch i 6 ~hown in the dashed-dotted tiesign and which in the unsqu~ezed t~tate corre~ponds to the crost~ sect~on formed hy the pump housing 11 ~nd the riny 25, is ~bsolutely rectangular.
Ir, this manner s~id hose c~n be enclosed into a simple ~Jhole, a ~tate th~t i5 èvident ~l~o from ~ir~ure 2~ and srcondly, in the squeezed shut st-~te, as ~hr3wn in ~igure 4~ it is much ~ '35 deforfned th~n it would be the ccl~e, for ex~mple, with ~ round cros~ sectic~n, wherè~y for the present invention round hoses c~n ~l~o ~e u~ed in principle. The side of the hose ~C~ i5 rein~orced, ~o th~t it is more wear resist~nt l~pon m~king contact with the inner wal 1 of thr~ hou~irlrd. The hc~e ~C~ is m~de prefer~ y ln such a m~nnr~r when it is pour0ri int~ an injection mould that corrospor,ds to the chamt~er ~c,r the ho~3e that i5 formed by the pump hr,,using 11 and the ring 25. In 50 doing, the hose i~ ~ade of ~ i 1 i cone ~ne-.teri ~1 c~r of an appl ic~ti on 5peci f i c materi al, whoe~e f~hri c~n al~o h~ reinforced~

Fiqur~ nd Figure~ 6 5hOI~ fle~ le rings th~t are rnerelv dif4erc~nt with re~pect t,o the pump lC~. Th~refore, a't thi~ st~ge th0~e rir,gs are descrlb~d in detail in the follo~^Jing. lhe ring . . -hich iC proSJ~ d in F~ ure 5 and ~Ihlch l~a arranc!ed ar~und the eccerltric l~, cc,mprisr~ ~r~ur ~yment~3 ~.' lyln~ e bv C:icle.~
~ht4 se~m0nt at the inles~ 21, r0spective outJ.et 2'', e~,~hlbi~.tn-~ ~n ~ :turn ~ edge-e"h~p~d fi11 r.:~r .;2''~ :

,ln the c.~se ~f,.~.he ~le~:ible ring 34 according 'tD ~i~urt? h, rolle4rs ~4' distrlbuted around the eccentric ~nd concentrically _ 7 ~ ;~5~1 ' ,.. i ,.. ,, . , --- - - : .
:
, ' ' ' 207377~

tu tne eccer,tri.c 1~ are provi.ded, ~herebY here the hoe,e ~?~
ber,t o~f directlv ~t~rting fr~m thir~lring :;4 ln the d:i.rection of tt1e inlet '~ r-espective outlet ~'; tne ihlet ~1~ and the outlet 22' are approximately c-orlcentric to rhe eccr2ntric and enter~ respectively leave, at the cover. ~he sepr~ratinn wall ~' extends ~s far a5 the ring and is forc~d agr.~inr.;t the ring~
r~di~lly mo~ea~le due to ~ sprin~ ~, 50 thr~t the r.~eparr-~tinq wa~l ~9~ ~lwayr~ abuts the ri.ny.

ln place o~ the sep~r,~ting ~Jall ~5'', the hose c~n exhihit ~t the ~end of tl-.e ~utlet-sided h~se 20 a cam, which e~:tends to~l~rds the inlet~sicled hose ~ and touches sc~id hose ~nd which i5 enveloped t~ c-,prin~ ~teel pl~te~ r"o thc~t the outlet-sided ho~e ~ does no~ squee~e the inlet-sidecl hose during prer~sure ~uild-up ~nd ~10~.l1d pr.~vent the medium from ~eing ~tuck.ed in~ ~cc.ording to Figure, 7~ guch r.~ crlm 4~'.) rlnd a spring steel plate envelc~pir,q said ca~ can ~ pro~ided at rt radial inlet.~ respective outlet of the hoS6~ ;~iJ~ r ; . a :~

:: . ' ~ "j, ' -' ' ' ~ ,, , ~ .

Claims (12)

Patent Claims

1. Pump comprising a pump housing forming a cylindrical chamber, an eccentric that can be rotary operated in said pump housing, and a hose that is disposed between said eccentric and pump housing and containing a medium to be conveyed and that is squeezed on the housing inner wall by the eccentric and with which the medium is conveyed peristaitically in the hose, wherein the hose (20) within the pump housing (11) is enclosed continously, and a flexible ring (25, 32, 34), which is made perferably of several parts (26, 27, 32, 34), is disposed between said hose and the eccentric (16).

2. Pump, as claimed in claim 1, wherein the parts of the ring (25) comprise rollers (26), which are arranged concentrically to the eccentric (16), and segments (27), which are disposed between said rollers and have approximately the same thickness.

3. Pump, as claimed in claim 2, wherein the segments (27) exhibit slots (27'') on both front sides for the purpose of increasing their radial flexibility.

4. Pump, as claimed in claim 1, wherein segments (32', 32'',) are provided as the parts of the ring (32).

5. Pump, as claimed in claim 1, wherein rollers (34'), arranged concentrically to the eccentric (16), are provided as the parts of the ring (34).

6. Pump, as claimed in any one of the preceding claims, wherein the hose (20) is guided a within the pump housing (11) in a winding around the eccentric (16) and the ends (20') of said hose, are bent off approximately radially or axially toward the outside and form the inlet (21, 21') or outlet (22, 22') while being arranged side-by-side, but separately from a wall (29, 29).

7. Pump, as claimed in any one of the preceding claims, wherein the hose (20) from the inlet (21) to outlet (22) is arranged in such a manner that the self-rotating eccentric (16) squeezes shut momentarily both ends (20') during the transition of its squeezing shut from the outlet to the inlet-sided region of the hose (20).

8. Pump, as claimed in claim 6, wherein the flexible ring (25, 32) exhibits a wedge-shape filler (28, 32''), which projects between the hose (20) mounted on the inlet and outlet side and which is made preferably of an elastic material.

9. Pump, as claimed in any one of the preceding claims, wherein the eccentric (16) is mounted on a drive shaft (14) and exhibits a roller bearing (16).

10. Pump, as claimed in any one of the preceding claims wherein the medium can be conveyed at a discharge pressure ranging from 6 to 10 (bar).

11. Hose for a pump, as claimed in any one of the preceding claims, wherein its cross section is substantially rectangular.

12. Hose, as claimed in claim 11, wherein it is made of conventional silicon material, which remains elastic and deformable during a long lifespan.