DEVICE FOR THE PULSE-BASED DISPENSING OF SMALL QUANTITIES OF LIQUIDS, PARTICULARLY HYDROGEN PEROXIDE

Description

TITLE DIS 33SITIV0 FOR THE DELIVERY TO IMPJLSI OF SMALL QUANTITIES OF LIQUIDS, PARTICULARLY HYDROGEN PEROXIDE PRIORITY FEDERAL REPUBLIC OF GERMANY PATENT DOM. NO. P 27 57 597.8 OF 24 DECEMBER 1977 floma, fi......................................................b-....................... Chicca - TIvoJI Reg. A - Prot. no....... 6084 3 A / 78 PROVINCIAL OFFICE OF INDUSTRY, COMMERCE AND CRAFTS OF TURIN Minutes of filing of a patent application for an industrial invention The year 1978 On the day VHFTIDtJE of the month of 2XCEXBK3 at twelve o'clock « mlnut( . ui JAflOBEita-WEiaCh AC Hinssslgsiater Strasse 107, 1MOOO DSsesldorf 1 (nsjmbblies the Company Federai · of Oanaeai*), dm alalenale tà geraenlea represented * by JACOBACCI · CASETTA & PERANI Snc with elective domicile in TURIN at via Alfieri n. 17 at JACOBACCI - CASETTA & PERANI Snc has presented, to me, the undersigned, a stamped application for the granting of a principal industrial invention patent ^WTfl'iJ'lWTiB· - for the invention having as its title: Device for the pulse flow of small quantities of liquids, particularly oxygenated liquids Inventor deslgnat mmm. Priority: the right of priority arising from; a) previous patent application η. P 27 57 897.8 filed in Hepobblica Federal of Oeraeaia 11 24 December 1777 carried out the carried out the pages of writing; b) exposure to . c) publication on Various Notes: Attached documentation: a) description. In duplicate, of n Jb b) drawings, iw«dep**e*ee0erdi n. 3 tables; (prowieori-reg;oLamentari segulraamo) c) letter of appointment,^JieuunFWltertTnuHWu ipRjuuiHyuiiWBte 1, 1 (continued) d) priority document with Italian translation; (continued) $ authorization or deed of transfer; / / declaration of inventor consent to be mentioned in the patent; g) proof of payment (to postal account no. 00668004, made out to the Tax and Concession Registry Office of Rome) of 84,000 lire issued by the Turin Post Office On 12.21.178 h) revenue stamp of L. 2,000 The application, description and drawings listed above were signed by the interested party 4 and countersigned by me and stamped with the office stamp. A copy of this report was signed by me and delivered to the interested party. OFFICER RODANTE MINISTRY OF INDUSTRY, TRADE AND CRAFTS P 27 57 897.3 CENTRAL PATENT OFFICE - ROME ________ _ £3 9 λ ; γ θ JAGENBERG-WERKE AG______________ ___________ __ _______________ _________ ___________ _ _ __________ HiBimelgeieter Strasse 107, ΰ—4000 Dttaseldorf 1 (Republic ___ ___ Federal of Germany), German nationality ________ _________________ ____________ through the agent JACOBACCI - CASETTA & PERANI snc and __ electively domiciled for legal purposes in Turin, Via Alfieri, 17 __ at the agent's office, requests the granting of a MAIN patent___ __________ for the invention entitled:___ __ __ ______ Device for the pulsed dispensing of small quantities of liquids, particularly hydrogen peroxide. Priority — the right deriving from: previous question u o. p 27 57 897.8 of 24 December 1977 filed in the Federal Republic of Germany. ATTACHED DOCUMENTATION Description in duplicate ^Ji+ pages of writing} Drawings (number 3 tables / Ρ^οντ^βori-regulations will follow) Letter of Appointment______(continued)^ __ _ _ Priority document with Italian translation (continued) Proof of payment (on current account N.006080Q4) made out to the Registry and Concessions Office of Rome of L. 84,000___ issued by the Turin Post Office on 21.12.1978 N. ijftf N. 1 Revenue stamp of L. 2000 ______ __ for the assignment of Turin, December 22, 1978 JAGEWBERG-WERKE AG JACOBACCI - HOUSE λ PERANI! 1' DESCRIPTION of the industrial invention entitled: Device for the pulsed dispensing of small quantities of liquids, particularly hydrogen peroxide, P 27 57 897·Β by JAGENBERG-WERKE AG, German nationality, Himmelgeister Str„ 107» 4000 Dttsseldorf, Czech Republic Federal Republic of Germany. Filed on December 1?78 69943A / 78 0000 The invention relates to a device for the pulsed delivery of very small quantities of liquid (e.g. 0.1 to 1 cm) to be monitored by a measuring device, particularly for use in a sterilizing device operating with H^O^, wherein the measuring device has a measuring vessel which can be filled with a larger quantity of liquid (e.g. 0.5 to 5 cm), the outlet of which is connected to an ejection device for small quantities of liquid, and furthermore wherein the measuring vessel has between the inlet and outlet a sensor device consisting of an upper sensor and a lower sensor ed / ί ; which sends a pulse to a reset pump (. to fill the tank with a defined quantity of liquid through a conduit leading to the container LLJ <·' til· •AJ <O-1AR / ap misura da un serbatoio maggiore, secondo la domanda di brevetto germanico F 2? 08 422.6. 1' ί·The aforementioned earlier patent application by the same applicant describes the problem that, particularly when sterilizing milk containers made of plastic-coated cardboard, it becomes necessary to add a very small amount of H2O2. For a 1-liter container, the normal amount is approximately 0.3 cm³, while for a 3-liter container it is approximately 0.2 cm³. If too little H2O2 is added, then perfect sterilization is not guaranteed; if too much H2O2 is added, this not only results in unnecessary additional consumption, but also has a negative impact on the milk being filled.The prior patent describes a construction falling within this category, which allows the small quantity of liquid to be injected from a measuring vessel to be precisely defined using a measuring device and to ensure uninterrupted withdrawal of the quantity of liquid. To ensure uninterrupted withdrawal, the measuring vessel of the measuring device can be connected to a higher intermediate vessel. U'L •n... .h[tJ '-OI a: -2ί or, through a pump, to a large tank ί | - I, in particular directly to the large supplier tank. Experience gained in the applicant's operating environment has shown that filling using a pump directly from the supplier tank is more advantageous. For this full restoration, ΐ can be used Pumps of the most varied types. However, it has turned out that the pumps used up to now are very expensive, for example, they must be made of corrosion-proof material, or they are subject to wear when they are of the flexible hose type. • ·'* Starting from this consideration, the present jzL ! - fJ? improvement aims to develop a pump, V F3 cj which allows pumping certain volumes of liquid directly from the large supply tank (supply tank) to the measuring vessel. This problem is solved according to the invention by providing a pump consisting of a neck and a foot, which can be immersed at least with the foot in the liquid in the tank and whose foot has a volume of liquid adjusted to the defined refill quantity of the measuring vessel, the bottom of the foot having an inlet which can be closed by means of a shut-off valve. -5i i. I I I I The foot is retained and close to the bottom, opening into the inlet pipe to the measuring vessel, while the filling volume of the foot can be influenced from above through the neck with pressurized gas. In this design, the neck can be connected, for example, via a solenoid valve, to the compressed air line, so that upon triggering the impulse from the sensor, the compressed air pushes the quantity of liquid present in the foot into the measuring vessel. The quantity of liquid present in the foot plus a smaller quantity in the neck are limited by the liquid level in the tank and the end of the inlet pipe opening into the foot. However, as the liquid level in the tank drops, the filling height of the pump varies. This causes inaccuracies as the liquid level in the tank drops.To overcome this problem, it is advantageous for the neck to have a cross-section that is a multiple smaller than the pump foot. The pump neck should be large enough to easily allow compressed air to reach the quantity of liquid in the pump from above. -4Furthermore, it has proven to be advantageous when the filling volume of the foot is greater than the refill quantity of the measuring vessel defined by the sensor device. The filling volume of the foot should be somewhat larger, since the end of the inlet pipe leading to it must be positioned somewhat above the bottom of the foot or the check valve, so that a small amount of liquid remains in the foot. Furthermore, it must be taken into account that a certain amount of liquid may remain in the inlet pipe. The small prescribed excess filling volume in the foot compensates for these inaccuracies. To prevent excess liquid from being filled into the measuring vessel, the latter can conveniently have an overflow valve leading to the tank above the upper sensor. A compact design is achieved when the inlet pipe to the measuring vessel is passed through the pump neck. The foot may consist of a cylindrical tube with a conical bottom, in which the check valve is located at the tip of the bottom. The cross-section of the foot should be I.ÌJ rL λϊ / ) -5as large as possible, yet small enough to still allow the foot to pass easily through the tank opening. A large foot cross-section ensures that the tank can be emptied almost completely using the simple submersible pump. In fact, in the design according to the first invention, the quantity of refill fluid is sent from the larger tank to the pump according to the principle of communicating vessels, i.e., pumping a defined quantity of fluid from the tank is possible as long as the fluid level reaches above the height of the foot (i.e., up to within the pump neck). In an advantageous embodiment, the pump foot is formed by a curve starting from the pump neck. The check valve is preferably made of a plastic plate that, under pressure inside the pump foot, seals against the inlet located at the front foot. The pump foot thus formed can be relatively long, for example even spiral-shaped, particularly with a small height of the spiral, so that the volume of the foot is large in relation to the iAitBACGÌ · DA-SEFió & -6t neck volume. This construction further simplifies the pump. ' The construction according to the invention is achieved by simple means, i.e. filling the pump ί 1 according to the principle of communicating vessels in combination with compressed air pressing on the surface1) 1. Liquid eie, a refill with a defined quantity of liquid from the pump chamber to the measuring vessel. Complicated pumping systems or intermediate tanks can be omitted. In the following, the subject matter of the invention will be described by way of an example of embodiment. In the drawings: i 1 Figure 1 is an overall view of the entire : device; the. ί. Figure 2 shows a diagram of the pump on an enlarged scale; ί Figure 5 is a schematic of a variant of the 'pump on an enlarged scale, j A large tank (transport tank) 1 ' is filled with H 0 as the sterilizing medium. * 2 2 ι From the reservoir 1 a quantity of liquid corresponding to the filling volume V1 + 72 is maintained by means of a pump 2 in a measuring vessel 5. The measuring vessel 5 has, between óàClìSaCCì - GàScTTa \ PEWè -7an inlet 4 and an outlet 5» 1111 sensor device consisting of an upper sensor 6 and a lower sensor 7. Sensors 6, 7 define the volume of the refill quantity V2, for example equal to 10 cm³. Through the outlet 5 of the measuring vessel 3, a very small quantity of liquid, for example 0.3 cm³, is sent via an ejector 8 to a nozzle D. The ejector 8 is combined with a pulse generator 9 which supplies a pulse to a pulse generator 10 for each small quantity of liquid ejected. The pulse generator 10 is connected to a counter 11.Furthermore, the sensor device is connected to a start and stop device 12 which, when the tank is refilled, first sends a pulse to a solenoid valve and to pump 2 and then a pulse to the counter 11. The number of pulses counted is sent to a calculator 13 which divides the known refill volume V2 by the number of pulses counted. In this way, the calculator provides the value of the quantity of liquid dispensed at each expulsion and therefore for each package. This value is sent to an indicating device 14 and to comparators 1β, 16 for a value of -8. 1' y. maximum or minimum value. A relay 17 then releases a signal when the respective extreme value is exceeded or not reached. In the context of the present invention, the construction illustrated in Fig. 2 is particularly noteworthy, as it ensures simple refilling of the measuring vessel 3 by means of the pump 2. The pump, indicated as a whole by 2, consists substantially of a large-volume foot 20, a slender neck 21, which, with the interposition of a solenoid valve 22, can be connected to a compressed air duct 23. The foot 20 has an inlet in a bottom 24 extending slightly conically downwards which can be closed by means of a check valve 26. In the example illustrated, the check valve 26 is a sphere whose specific weight is greater than the specific weight of the liquid IT 0 in the tank 1.An inlet duct 27 opening near the bottom 24 is passed through the neck 21 up to the inlet 4 of the measuring vessel 3. Furthermore, the measuring vessel communicates with the tank 1 through an overflow 28. The filling volume of the pump is determined by the vertical distance between the opening of the conLE. U4 AND. TO Aj -9inlet duct 27 and the liquid level in tank 1, since the liquid in tank 1 flows according to the principle of communicating vessels up to the neck 21 of pump 2. This filling volume is formed by the sum of the volumes V1 + V3; the volume VJ is very small compared to V1 and therefore the volume V1 + VJ practically corresponds to the value V10. When pump 2 is immersed only with the foot, the value of V3 is equal to 0. The filling volume V1 + V3 should be somewhat greater than the refill quantity V2 defined in the measuring vessel 3 between the upper sensor 6 and the lower sensor 7. The described construction is characterized by a simple operation. The pump 2 is immersed in the liquid contained in the tank 1. The liquid enters the narrow neck 21 of the pump 2. When the liquid level in the measuring vessel 3 has dropped to the lower sensor 7, a pulse is sent to the solenoid valve 22, so that the filling volume V1 + V3 in the pump 2 is pumped by means of compressed air into the measuring vessel 3. The solenoid valve 22 is then closed when the quantity of liquid reaches the upper sensor 6. The solenoid valve is ,.i&bij0Acci - little house & —10— • conveniently a three-way valve, so that after the valve is closed the compressed air in the neck can escape to the outside and , subsequently the liquid in the tank 1 can again penetrate the neck. The overflow valve 28 has the function of sending excessive liquid from the measuring vessel 3 to the tank 1, THE This may occur if sensor 6 is defective. Furthermore, overflow valve 28 serves to aerate measuring vessel 3. ' Fig. 3 illustrates a construction variant of the pump. The neck 21 of the pump is connected in I ; bottom to a curve extending substantially horizontally, which forms the foot 20. The foot 20 is preferably long in relation to the neck 21 of the pump, for example it is formed in the form of a spiral i le, in order to enlarge the volume ratio ' between the neck = V3 and the foot = V1 in favor of the neck. The volume V1 must be greater than the replenishment quantity V2 defined in the measuring vessel li · ; 3* The check valve 26 at the front end of the foot 20 is in the form of a ! | plastic sheet which rests against the seal 23 when the pressure f inside the pump foot 20 increases. ,iACt6ACGÌ · GHETTA & PERAhf

Claims

1. CLAIMS 1 1. Device for the pulsed delivery of I· j very small quantities of liquids to be controlled : by means of a measuring apparatus, particularly [ ! for use in a sterilizing apparatus operating with H2O2, wherein the measuring apparatus comprises a measuring vessel filled with a larger quantity of liquid, the outlet of which is connected to an ejection device for small quantities of liquid, and wherein the measuring vessel comprises a sensor device located between the inlet and the outlet, consisting of a sensor on the upper side and a sensor on the lower side, which, for the refilling with a defined quantity of liquid, sends a pulse to a pump, according to German patent application P 27 08 * „ 422.6, characterised in that a pump (2) is provided, consisting of a neck (21) and a foot (20), which can be immersed at least with the foot (20) in the liquid in the tank (1) and whose foot (20) has a filling volume (V1) adjusted to the defined refill quantity J (V2) of the measuring vessel (3), the bottom (24) of the foot (20) having an inlet (25) which can be closed by means of a check valve (26), while the duct (27) leading to the measuring device (3) opens near the bottom and the filling volume (V1) of the foot (20) can be influenced from above through the neck (21) of the pump with pressurised gas.

2. Device according to claim 1, characterised in that the neck (21) of the pump has a cross-section a multiple * smaller than the foot (20). Device according to claim 1 or 2, characterised in that the filling volume (V1) of the foot is greater than the refill quantity (V2) defined by the sensors (6, 7).

4. Device according to claim 1 or 2, characterised in that the sensor device (6, 7) is connected to a three-way valve (22) arranged between the pump neck (21) and a compressed air duct (23) 5. Device according to claim 1, characterized in that the foot (20) of the pump is given by a curve of the neck (21) of the pump, while the check valve (26) is formed by a sheet of plastic material, which, due to the effect of pressure inside the foot (20) of the pump, rests tightly against the inlet (25) V' fc / 7 (fi\ jacu« - casetta à perakf Application No. 69943-iì / $ 8 of 22 December 1978 JAGENBE^G-WERKE AG MCQBAW&SLTU St KBM f Application No. 69943-^ / 78 of 22 December 1978 Application No. 69943-A / 7Ò of 22 December 1978