DK160894B

DK160894B - Displacement pump and use thereof

Info

Publication number: DK160894B
Application number: DK534888A
Authority: DK
Inventors: Joergen Joergensen; John Persson; Henning Haaning Hoej
Original assignee: Acmi I S Ved Henning Haaning H
Priority date: 1988-09-26
Filing date: 1988-09-26
Publication date: 1991-04-29
Also published as: DK534888D0; DK160894C; DK534888A

Description

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DK 160894 BDK 160894 B

5 Opfindelsen angår en håndbetjent fortrængningspumpe af den i krav l's indledning angivne art. Sådanne fortrængningspumper anvendes til mange forskellige kendte formål, fordi denne pumpetype er driftsikker og kan konstrueres til pumpning af medier, lige fra helt flydende, vandige medier 10 til meget tyktflydende pastaer, jfr. f.eks. de amerikanske patenter nr. 3.799.037 og nr. 4.667.575.The invention relates to a hand operated displacement pump of the kind specified in the preamble of claim 1. Such displacement pumps are used for a variety of known purposes because this pump type is reliable and can be designed for pumping media, from fully liquid, aqueous media 10 to very viscous pastes, cf. eg. U.S. Patent Nos. 3,799,037 and 4,667,575.

De kendte pumpekonstruktioner anvender en fjeder, sædvanligvis en skruefjeder, til at sikre stemplets returslag, og 15 stempel og membran er sædvanligvis udformet, så stemplet påvirker membranen ved en mere eller mindre punktmæssig belastning, hvilket reducerer membranens levetid.The known pump designs use a spring, usually a coil spring, to secure the return stroke of the piston, and the piston and diaphragm are usually designed so that the piston affects the diaphragm at a more or less point load, reducing the life of the diaphragm.

Formålet med opfindelsen er at angive en membranpumpe af 20 denne art, hvortil der ikke behøves nogen returfjeder for stemplet, og hvor stemplets belastning af membranen sker jævnt fordelt over hele membranen, så den får en meget lang levetid. Pumpen skal iøvrigt være indrettet således, at den vil kunne godkendes til pumpning af flydende og pastalig-25 nende nærings- og nydelsesmidler.The object of the invention is to provide a diaphragm pump of this kind, for which no return spring is required for the piston, and where the piston's load on the diaphragm is distributed evenly throughout the diaphragm for a very long service life. The pump must also be arranged so that it can be approved for pumping liquid and paste-like food and enjoyment agents.

Dette formål opnås ved at udforme pumpen ifølge opfindelsen som angivet i krav 1's kendetegnende del.This object is achieved by designing the pump according to the invention as set forth in the characterizing part of claim 1.

30 Pumpemekanismens eneste bevægelige del er en elastisk membran, der påvirket af et håndbetjent pumpestempel og ændrer kammerets volumen, og en portion af samme størrelse som volumenændringen udleveres under nedtrykning af stemplet. Når stemplet slippes, vil den elastiske membran vende 35 tilbage til sin oprindelige stilling og herunder føre 230 The only moving part of the pump mechanism is an elastic diaphragm, which is influenced by a hand-operated pump piston and changes the chamber volume, and a portion of the same size as the volume change is dispensed under the plunger. When the piston is released, the resilient diaphragm returns to its original position, including lead 2

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stemplet tilbage til sin udgangsstilling, og der vil samtidig hermed suges pumpemedium op fra et reservoir, så pumpekammeret hele tiden er fyldt. En sådan pumpekonstruktion er nem at rengøre, og den kan udformes af materialer, der er 5 acceptable til kontinuerlig fødevarekontakt. Pumpen ifølge opfindelsen kan rengøres i samlet tilstand, men er desuden meget enkel at adskille for kontrol af rengøring. Pumpekonstruktionen medfører desuden, at der ved sædvanlig brug ikke suges luft ind i pumpekammeret med mulig bakteriolo-10 gisk forurening af det fødevaremedium, der skal pumpes.the plunger returns to its initial position and at the same time pumping medium will be sucked up from a reservoir so that the pumping chamber is constantly filled. Such a pump structure is easy to clean and can be formed from materials acceptable for continuous food contact. The pump according to the invention can be cleaned in overall condition, but is also very easy to separate for control of cleaning. In addition, the pump design means that in normal use, air is not sucked into the pump chamber with possible bacteriological contamination of the food medium to be pumped.

Pumpen ifølge opfindelsen er fortrinsvis udviklet og udformet til at anvendes som angivet i krav 2's kendetegnende del, nemlig til udlevering af nærings- eller nydelsesmid-15 delprodukter. Det ligger imidlertid inden for opfindelsens rammer også at anvende pumpen til andre medier som f.eks. andre nærings- og nydelsesmidler end de nævnte, eller f.eks. sæbe, cremer, rengøringsmidler, maling o.s.v.The pump according to the invention is preferably developed and designed to be used as claimed in the characterizing part of claim 2, namely for the delivery of nutritional or enjoyment products. However, it is within the scope of the invention to also use the pump for other media, e.g. other food and beverages other than those mentioned, or e.g. soaps, creams, detergents, paints, etc.

20 Opfindelsen forklares herefter nærmere under henvisning til tegningen, der viser en foretrukken udførelsesform for opfindelsen, idet fig. 1 viser pumpen ifølge opfindelsen set i perspektiv, 25 fig. 2 viser et centralt snit i pumpen under ansugning, og fig. 3 viser det samme som fig. 2, men under pumpning.The invention will now be explained in more detail with reference to the drawing, which shows a preferred embodiment of the invention, fig. 1 is a perspective view of the pump according to the invention; FIG. 2 shows a central section of the pump during suction, and FIG. 3 shows the same as FIG. 2, but during pumping.

30 På fig 1 ses pumpen ifølge opfindelsen fastgjort til en bordplade 23, idet der under bordpladen er en tilførselsstuds 21, f.eks. en slange- eller rørforbindelse, for tilførsel af det medium, der skal udleveres af pumpen 1. Pum-35 pen 1 omfatter et pumpehus 2, fortrinsvis af rustfrit stål,Fig. 1 shows the pump according to the invention attached to a countertop 23, having underneath the countertop a supply nozzle 21, e.g. a hose or pipe connection for supplying the medium to be delivered by the pump 1. The pump 1 comprises a pump housing 2, preferably of stainless steel,

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3 en udløbstud 4 med udløbsrør 17 og et stempel 6, der indføres i pumpehusets 2 pumpekammer.3 shows an outlet spout 4 with outlet pipe 17 and a piston 6 which is inserted into the pump chamber of the pump housing 2.

På fig. 2 og 3 ses et tværsnit i pumpen. I pumpehuset er 5 afgrænset et cylindrisk pumpekammer 11 ved hjælp af husdele 24, hvor den nederste husdel er anbragt inde i rørstykket, og hvor den øverste husdel ved stram pasning delvis er indført i røret. Ved hjælp af lange bolte 19 er delene spændt sammen omkring pumpekammeret 11. Pumpekammeret 11 afgrænses 10 opadtil af en pumpemembran 10, hvori der er indført et pumpestempel eller en pumpestang 6, der foroven går over i et håndtag 5, som ved nedtrykning etablerer pumpefunktionen, og som i sin nederste ende er afrundet.In FIG. 2 and 3, a cross-section is seen in the pump. In the pump housing 5 is defined a cylindrical pump chamber 11 by means of housing parts 24, the lower housing part being arranged inside the pipe piece and the upper housing part being partially inserted into the pipe by tight fitting. By means of long bolts 19, the parts are clamped around the pump chamber 11. The pump chamber 11 is delimited upwards by a pump diaphragm 10, in which a pump piston or pump rod 6 is inserted which goes into a handle 5 which, when pressed down, establishes the pump function. and which at its lower end is rounded.

15 I pumpestemplet 6 er der en eller flere lodrette noter 8, og i den øverste husdel 24 er der anbragt en undersænket skrue 9 eller lignende, der går i indgreb med noten 8 og begrænser, hvor langt nedad stemplet 6 kan føres. Membranen 10 er udformet af gummi eller plast og er indspændt mellem 20 den øverste husdels 2 dele. I den nederste husdel 24 er anbragt en kontraventil omfattende en ventilkugle 12 og et ventilsæde 13 samt et kuglestop 20.15 In the pump piston 6 there are one or more vertical grooves 8, and in the upper housing part 24 a recessed screw 9 or the like is arranged which engages the groove 8 and limits how far down the piston 6 can be carried. The diaphragm 10 is made of rubber or plastic and is clamped between the 2 parts of the upper housing. In the lower housing part 24 is arranged a check valve comprising a valve ball 12 and a valve seat 13 as well as a ball stop 20.

Det medium der suges op gennem slangestudsen 21 kan passere 25 kontraventilen gennem et eller flere huller 14 og løbe op i pumpekammeret 11. Udleveringen af pumpemediet sker gennem en udløbstud 4, der er afspærret af en kontraventil omfattende en ventilkugle 15, en fjeder 22 og et ventilsæde 16. Ventildelene kan udtages for rengøring ved at afskrue luk-30 keskruen 18.The medium sucked up through the hose nozzle 21 can pass through the check valve through one or more holes 14 and run into the pump chamber 11. Delivery of the pumping medium takes place through an outlet valve 4 which is blocked by a check valve comprising a valve ball 15, a spring 22 and a valve seat 16. The valve parts can be removed for cleaning by unscrewing the lock screw 18.

Når stemplet 6 og dermed membranen 10 føres længere ind i pumpekammeret 11, lukker ventilkuglen 12 på grund af trykstigning i pumpekammeret, hvilken trykstigning samtidig 35 åbner ventilkuglen 15, og en portion udleveres gennem ud- 4As the piston 6, and thus the diaphragm 10, is moved further into the pumping chamber 11, the valve ball 12 closes due to pressure rise in the pumping chamber, which pressure rise 35 simultaneously opens the valve ball 15 and a portion is delivered through the discharge chamber 4.

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løbsrøret.flow pipe.

I stemplet 6 kan være anbragt flere langsgående parallelle noter 8, og i stemplets nederste del kan være anbragt en 5 rundtgående not 7, der forbinder de langsgående noter 8 med hinanden. Ved at trække stemplet 7 så langt op som muligt, kan man dreje stemplet og dermed få skruen 9 til at gå i indgreb med en af de andre noter. Hermed ændres den udpor-tionerede mængde fra pumpen. På stemplets håndtag 5 kan væ-10 re påført markeringer visende, hvilken not 8, der i øjeblikket er i indgreb med skruen 9 og dermed, hvor stor en mængde pumpen udleverer pr. pumpeslag.Several longitudinal parallel grooves 8 may be arranged in the piston 6, and a lower circumferential groove 7 connecting the longitudinal grooves 8 to each other may be provided. By pulling the plunger 7 as far as possible, one can rotate the plunger and thus cause the screw 9 to engage one of the other grooves. This changes the amount of output from the pump. On the piston's handle 5, markings 10 can be applied showing which groove 8 is currently in engagement with the screw 9 and thus the amount of pump dispensed per unit. pump stroke.

15 20 25 30 3515 20 25 30 35

Claims

1. Hand operated displacement pump for liquid or paste-like media and having a pump housing (2) with a pump chamber (11) and a piston means therefor, as well as an inlet valve (12,13) and an outlet valve (15,16), both operated by the pressure in the pump chamber and wherein the piston means comprises an elastic diaphragm (10) which forms part of the boundary of the pump chamber and a hand operated pump piston (6) adapted to move the diaphragm (10) so that the volume of the pump chamber (11) is changed, characterized in that the diaphragm (10) is formed as a rubber or plastic tubular piece which extends into the pump chamber, which is closed at the end projecting into the chamber (11), the diaphragm being cast into one and the pump piston (6) is a rod-shaped member which substantially fills the pipe piece.

Use of a pump according to any one of claims 1 for dispensing liquid or pasta-like foods, such as mustard, ketchup, remoulade, etc.