SU964460A1

SU964460A1 - Liquid batchmeter

Info

Publication number: SU964460A1
Application number: SU782686158A
Authority: SU
Inventors: Андрей Дмитриевич Шутов; Иосиф Александрович Вайнтрауб
Original assignee: Кишиневский Ордена Трудового Красного Знамени Государственный Университет Им.В.И.Ленина
Priority date: 1978-11-21
Filing date: 1978-11-21
Publication date: 1982-10-07

Description

Изобретение относитс к дозированию жидкости и может быть использовано в научных и клинических лаборатори х всех областей промышленности.The invention relates to the dosing of liquids and can be used in scientific and clinical laboratories in all areas of industry.

Известны дозаторы- жидкости, содержащие корпус, плунжер со штоком и ограничитель хода плунжера 1. .Known dispensers are fluids containing a housing, a plunger with a rod and a stroke limiter of the plunger 1..

Известна шнрицева пипетка с точно дозируемым объемом вытеснени , содержаща корпус, плунжер со штоком, и ограничитель движени плунжера со ступенчатым регулированием величины дозы 2 .A well-known shnritsev pipette with a precisely metered displacement volume, comprising a housing, a plunger with a stem, and a plunger movement limiter with stepwise adjustment of the dose 2.

Известна шприцева пипетка недостаточно высокую точность дЬзировани , так как не обеспечивает возможность корректировки величины каждого из дозируемых объемов.The well-known syringe pipette is not sufficiently high dizirovanie, because it does not provide the ability to adjust the value of each of the dosed volumes.

Цель изобретени - повышение точности дозировани и регулирование величины дозы.The purpose of the invention is to improve the accuracy of dosing and control the dose.

Указанна цель .достигаетс тем, что в дозаторе жидкости, содержащем корпус, установленный в нем плунжер .со штоком, ограничители движени плунжера, корпус снабжен поворотной головкой, соединенной упругими элементами с плунжером, который снабжен упором, установленным с возможностью взаимодействи с ограничител ми движени плунжера, установленными эксцентрично оси плунжера с возможностью перемещени по вертикали .This goal is achieved by the fact that in a liquid dispenser comprising a housing, a plunger mounted therein. set eccentrically to the axis of the plunger with the ability to move vertically.

Кроме того, дозатор снабжен фиксатором углового положени поворотной головки.In addition, the dispenser is provided with a lock for the angular position of the swivel head.

На фиг. 1 изображен дозатор, общий вид; на фиг. 2 - сечение по FIG. 1 shows the dispenser, general view; in fig. 2 - section along

10 А-А на фиг. 1.10A-A in FIG. one.

Доз.атор жидкости содержит корпус 1, на котором укреплены цилиндр 2 с трубкой 3 дл засасывани или слива жидкости и крышка 4. Плунжер 5 снабжен упором 6. К крышке 4 присоедине15 ны на резьбе ограничители 7 возвратного движени плунжера, расположенные по окружности с центром на продолжении оси плунжера. В отверстие The fluid dispenser comprises a housing 1 on which a cylinder 2 with a tube 3 for sucking or draining the liquid and a lid 4 are fixed. Plunger 5 is provided with an abutment 6. To the lid 4 are attached to the thread limiters 7 of the return movement of the plunger located around continuation of the plunger axis. Into the hole

20 в центре крышки 4 вставлена поворотна головка 8, имеюща центральное отверстие дл прохода штока 9. Поворотна головка 8 соединена с плунжером 5 упругими раст жимыми элементами 10. Крышка 4 снабжена фиксато25 ром 11 углового положени поворотной головки 8.20, in the center of the cover 4, a rotatable head 8 is inserted, having a central opening for passage of the rod 9. The rotatable head 8 is connected to the plunger 5 by elastic stretch elements 10. The lid 4 is provided with a lock 11 of the angular position of the rotary head 8.

вat

Устройство работает следующим The device works as follows.

Claims

30 way. in the initial position (Fig. 1) the rotary head 8 is in one of the fixed positions according to the selected dosing volume. Plunger 5 is in the upper position, contacting the stop 6 with one of the stops 7, Cylinder 2 with the pipe 3 filled with dosing liquid. Pressing the rod 9 the operator, the resistance of the stretchable elastic elements 10, which moves the plunger 5 to the lower position. At the same time, the dosing volume of liquid is displaced from cylinder 2 through tube 3. The reciprocating movement of the plunger and the suction of the liquid for re-dosing is carried out due to the elasticity of the stretched elements 10. To change the size of the dosing volume, the operator turns the head 8 to a fixed position corresponding to the selected dosing volume. At the same time, the elastic expansion elements 10 create a torque, as a result of which, after pressing the rod 9, the plunger 5 rotates around the longitudinal axis in such a way that the stop 6 is positioned in contact with the corresponding limiter 7 of the return movement of the plunger. Thus, the elastic expandable elements 10 are involved in the performance of two independent functions: the return movement of the plunger and the change in the angular position of the support 6 when the value of the dispensed volume changes. . The adjustment of the quantity of the dosed volume is made by moving the stops T parallel to the axis of the plunger and is carried out due to their threaded connection with the lid 4 The allowable deviation of the dosed volume from the nominal value should not exceed the standard error of the dosage. The high accuracy of dosing, achieved by syringe dispensers, in the absence of the possibility of adjusting the volume to be dispensed, imposes an increased requirement on the accuracy of the design elements that determine the size of the dispensed volume. The acceleration of the latter by moving the plunger return movement restriction limiters significantly reduces the accuracy requirements for the specified structural elements of the proposed liquid dispenser. Test m. It was established that by the indicated correction method it is possible to bring the deviation of the dosed volume from the nominal to the permissible value. The tests also show the failure-free operation of the mechanism for the step change in the dosed volume. Claims 1. A fluid dispenser comprising a housing, a plunger with a stem installed therein, plunger movement limiters, characterized in that, in order to improve metering accuracy, the housing is provided with a rotatable head connected by resilient elements to the plunger, which is provided with an emphasis installed the possibility of interaction with the plunger limiters installed eccentrically to the axis of the plunger with the possibility of vertical movement, 2. The dispenser according to claim 1, about what / what, in order to regulate the magnitude of the doses s, it is equipped with a locking angular position noBOHPOTHqp head. Sources of information taken into account in the examination 1. US Patent No. 4056215, cl. 222/309, 07/14/78.

2. US Patent 3591056, incl. 222/309, 222/340, 21.05.77 (prototype).

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