ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTRBGCZEEHUPLSKBAHRIS..MTNORSMESMMAKHTNMD..........
J
BDM Ver 2.0.14 (4th of August) - 1100000/0
3954899
EUROPEAN PATENT APPLICATION
A1
20220216
EP
20464011.4
20200901
20200923
en
en
en
202000503
20200810
RO
20220216
202207
20220216
202207
F04B 17/00 20060101AFI20201127BHEP
F04B 9/02 20060101ALI20201127BHEP
F04B 13/00 20060101ALI20201127BHEP
F04B 7/00 20060101ALI20201127BHEP
F04B 7/00 20130101 FI20201124BHEP
F04B 13/00 20130101 LI20201124BHEP
F04B 17/00 20130101 LI20201124BHEP
F04B 9/02 20130101 LI20201124BHEP
de
PUMPSYSTEM
en
PUMPING SYSTEM
fr
SYSTÈME DE POMPAGE
1
Stefan cel Mare University of Suceava
101807937
13, University Street
720229 Suceava, County Suceava
RO
Toader, Eusebiu Vasile
jud. Suceava
RO
NITAN, Ilie
jud. Suceava
RO
PAVAL, Mihaela
jud. Suceava
RO
Milici, Dan Laurentiu
jud. Suceava
RO
Cernusca, Dumitru
jud. Suceava
RO
Milici, Mariana Rodica
jud. Suceava
RO
Graur, Adrian
jud. Suceava
RO
Dimian, Mihai
jud. Suceava
RO
Ungureanu, Constantin
jud. Suceava
RO
AL
AT
BE
BG
CH
CY
CZ
DE
DK
EE
ES
FI
FR
GB
GR
HR
HU
IE
IS
IT
LI
LT
LU
LV
MC
MK
MT
NL
NO
PL
PT
RO
RS
SE
SI
SK
SM
TR
BA
ME
KH
MA
MD
TN
Pumping system comprising a cylindrical container (1) provided with a piston (2) which is moved by means of a rod (3) ending in a T-shaped profile provided at its lower end with a support (4) fixing two nitinol springs (5, 5'), which have the other two ends rigidly fixed; wherein the upper part of the rod T-shaped profile acts at the ends of the stroke two double microcontacts (M _1 , M _1 '; M _2 , M _2 '), which control: the closing and opening of an electrovalve (6) which supplies liquid to the cylindrical container (1), the starting of fans (7, 7') which cool the nitinol springs (5, 5'), and the disconnection of heating circuits of the nitinol springs (5, 5'), said heating circuits being controlled alternately by two relay contacts (k_1, k_2) via a microcontroller (8).
The invention relates to a pumping system made on the basis of elastic elements of Nitinol, intended for dosing constant amounts of liquid.
In order to make devices for pumping fluids, a solution is known, (KIMURA S., Micropump. Patent application no. JP33528492A / 19.11.1992) which consists mainly in the use of an elastic pipe provided at the ends with two unisense valves and which has concentrically placed on its surface an arc of shape memory material commanded in the current. By feeding, respectively, by supply interruption of the spring with shape memory, the elastic pipe contracts and expands transporting the fluid along its length.
The disadvantages of the described solution are that the placement of the spring of smart material along the length of the pipe leads to difficult control of the amount of liquid pumped, errors in determining the amount of liquid conveyed, high complexity of execution due to thermal insulation and changes in the elastic pipe properties because is subjected to temperature variations.
The technical problem solved by the invention consists in the realization of a pumping system, controlled by a pair of nitinol springs, to which the pumped liquid quantity and the actuation time can be controlled.
The pumping system according to the invention eliminates the disadvantages presented by the fact that it consists mainly of a cylindrical container, provided with a piston which is actuated by a system with two nitinol springs heated alternately by the Joule effect and through a timing circuit controls the movement of the piston through the cylindrical container, thus ensuring the pumping of a set amount of liquid.
The invention has the following advantages:
- constructive simplicity;
- elimination of pumped flow control errors;
- high operational safety and increased reliability;
- high fluid control accuracy.
An embodiment of the invention is given below in connection with Figure 1 which is an overview of the pumping system.
The pumping system according to the invention consists mainly of a cylindrical container 1, provided with a movable element (piston) 2 whose rod 3 ends with a T-shaped profile, provided at the lower end with a support 4 which fix two springs with nitinol 5 and 5 ', which have the other two ends fixed rigidly. The upper part of the rod profile 3 acts at the ends of the stroke the double microcontacts M_1, M_1' and respectively M_2, M_2', which control the closing and opening of the electrovalve 6 and the fans 7 and 7 'and disconnects the heating circuits of the nitinol springs 5 and 5' controlled alternately by the contacts of relays k_1 and k_2 via a microcontroller 8.
The microcontroller 8 controls for a set time the closing of the relay contact k_2 (the contact M_2 in the heating circuit being normally closed), feeds the spring 5 (which is heated by the Joule effect and compresses when the switching temperature is reached), moving the piston 2 until in point B, when the microcontact M_2 is actuated, which controls the normally closed contact (thus interrupting the supply of the nitinol spring 5) and at the same time the normally open contact M_2' which simultaneously supplies the electrovalve 6 (which supplies the cylindrical container 1) and fan 7 that will cool the nitinol spring 5. Once the timing of relay k_2 expires, it will be controlled by the microncontroller 8 for a new period of time to actuate the contact of the relay k_1, which supplies the nitinol spring 5' (which heats and compresses) making it possible to move the piston 2 to point A and pump the liquid outwards, and when the rod 3 reaches point A, the microcontact M_1 will be activated, opening the normally closed contact which interrupts the supply of the spring 5' and at the same time the normally open contact M_1' is actuated, starting the fan 7' which will help to cool the spring 5'. When the set timing expires, the cycle is resumed, and depending on the timing set by the microcontroller 8, controlled amounts of fluid can be pumped or the pumped flow can be set.
The pumping system according to the invention can be reproduced with the same characteristics and performances whenever necessary, which is an argument in favour of respecting the industrial applicability criterion.

References
1. [1]. KIMURA S., Micropump. Patent application no. JP33528492A/19.11.1992.
1. Pumping system, characterized in that it consists mainly of one of a cylindrical container (1), provided with a piston (2) which is moved by means of a rod (3) ending in a shaped profile of T, provided at the lower end with a support (4) fixing two nitinol springs (5) and (5 '), which have the other two ends rigidly fixed, and the upper part of the rod profile (3) acts at the ends of the stroke of the doubles microcontacts (M_1), (M_1') respectively (M_2), (M2'), which controls the closing and opening of the electrovalve (6), the fans (7) and (7') and disconnects the heating circuits of the nitinol springs (5) and (5 ') controlled alternately by the contacts of relays k_1 and k_2 via a microcontroller (8).
2. Pumping system according to claim 1, characterized in that the microcontroller 8 controls for a set time the closing of the relay contact (k_2) (the contact (M_2) in the heating circuit being normally closed), the nitinol spring (5) is fed (which is heated by the Joule effect), moving the piston (2) to point B, at which point the microcontact (M_2) is actuated, which controls the normally closed contact (thus interrupting the spring supply) and at the same time the normally open contact (M_2') which simultaneously supplies the electrovalve (6) (which supplies liquid to the cylindrical container (1)) and the fan (7) which will cool the nitinol spring (5) and once its timing expires (k_2) it will be controlled by the microcontroller (8), for a a new period of time, the actuation of the relay contact (k_1), which supplies the nitinol spring (5') (which is heated and compressed) making it possible to move the piston (2) to point A and pump the liquid outwards, and when the rod (3) reaches point A the microcontact (M_1) will be actuated, opening the normally closed contact which interrupts the supply of the spring (5') and at the same time the normally open contact (M_1') is actuated and starts the fan (7') which will help at the spring cooling. When the set timing expires, the cycle is resumed, and depending on the timing set by the microcontroller (8), controlled flows and controlled quantities of fluid can be pumped.
EP
20464011.4
Stefan cel Mare University of Suceava
1
MN
20201204
F04B
RO
132827
A2
UNIV STEFAN CEL MARE DIN SUCEAVA [RO]
20180928
A
1,2
* the whole document *
WO
2004032994
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THERASENSE INC [US]
20040422
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1,2
* the whole document *
JP
H06159250
A
TOKIN CORP
19940607
A,D
1,2
* the whole document *
Olona Laglera, C
Munich
20201125
RO
132827
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20180928
NONE
WO
2004032994
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20040422
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506538
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20050713
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2290238
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2322798
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2383470
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2385253
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2004115067
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20090423
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2004032994
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H06159250
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NONE

REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description
- JP
33528492
A
19921119
[0002]
[0011]