SU892014A1

SU892014A1 - Positive-displacement pump

Info

Publication number: SU892014A1
Application number: SU802903315A
Authority: SU
Inventors: Юрий Васильевич Чирков; Владимир Борисович Киреневич; Александр Петрович Хмелев
Original assignee: Отделение Всесоюзного научно-исследовательского института электромеханики
Priority date: 1980-04-01
Filing date: 1980-04-01
Publication date: 1981-12-23

Description

(54) ОБЪЕМНЫЙ НАСОС(54) BULK PUMP

1one

Изобретение относитс к насосостроению , а именно к объемным насосам и может найти применение в различных област х народного хоз йства дл дозированной подачи рабочей среды при знакопеременном перепаде давлени на насосе.The invention relates to pump engineering, in particular, to volumetric pumps and can be used in various areas of national economy for the dosing of the working medium at alternating pressure drop across the pump.

Известен объемный насос, содержащий насосную камеру с вытеснителем, сообщенную с выходным каналом гидролинией, в которой установлен управл емый нагнетательный клапан, снабженный запорной мембраной , взаимодействующей центральной Q частью с седлом нагнетательного клапана, и управл ющей камерой, расположенной с противоположной седлу сторону мембраны и сообщенной с входным каналом насоса.A positive displacement pump is known, which contains a pump chamber with a displacer, which is connected to the outlet channel by a hydroline, in which a controllable discharge valve is installed, equipped with a shut-off membrane, an associated Q central part with a pressure valve seat, and a control chamber located on the opposite side of the membrane and communicated with pump inlet.

Насос работает при отрицательном перепаде давлений, т. е. при давлении на входе 5 превышающем давление на выходе, обеспечива при этом высокую точность дозировани 1.The pump operates at a negative pressure drop, i.e., at inlet pressure 5 above the outlet pressure, while ensuring high metering accuracy 1.

Однако известный насос не способен работать при положительном перепаде давлени , т. е. когда давление на выходе превы- 20 щает давление на входе в насос, так как при этом возникает обратный ток рабочей среды.However, the known pump cannot operate with a positive pressure drop, i.e., when the outlet pressure exceeds 20 at the pump inlet, as this results in a reverse current of the working medium.

Цель изобретени - расщирение функциональных возможностей путем обеспечени возможности работы насоса при знакопеременном перепаде давлени .The purpose of the invention is to extend the functionality by enabling the pump to operate at alternating pressure drops.

Дл достижени цели насос дополнительно снабжен обратным клапаном, установленным в гидролинии последовательно управл емому нагнетательному клапану и нормально закрытым дл прохода рабочей среды из выходного канала в насосную камеру .To achieve the goal, the pump is additionally equipped with a check valve installed in the hydraulic line of the sequentially controlled discharge valve and normally closed for the passage of the working medium from the outlet channel to the pump chamber.

На чертеже представлен насос.The drawing shows the pump.

Claims

In the pump housing 1, there is a pump chamber 2 with a displacer 3 connected to the bark 4 of the electromagnetic actuator 5. The pump chamber 2 communicates with the output channel 6 by the hydraulic line 7, in which a controllable discharge valve is installed, formed by the locking membrane 8 and the seat 9, with which membrane 8 interacts with its central part. The discharge valve is provided with a control chamber 10 located on the opposite side of the seat 9 of the membrane 8 and communicating with the inlet channel 11 (the communication line is not shown). In hydroline 7, a check valve 12 is installed in series with the discharge valve, which is normally closed for the passage of the working medium from the outlet channel to the pump chamber

2. The pumping chamber 2 is also provided with a suction valve formed by an elastic sleeve 13 installed in the bore of housing I. On the outer side of the sleeve 13 in the housing 1, a channel 14 is connected to the inlet channel 11. When the electromagnetic drive 5 is supplied with alternating current 4, it is connected together with displacer 3 performs a reciprocating movement. When this occurs, the volume of the pump chamber 2 periodically changes, the working medium is sucked into it from the inlet channel 11 and the working medium is displaced into the outlet channel 6. With a pressure in the inlet channel 11 that is larger than the outlet channel 6, the check valve 12 does not work, so how freely it passes the working medium to the output channel 6 during the pumping and suction cycles. However, at the suction stroke, the membrane 8 closes the saddle 9, pressing to it the pressure in chamber 10 equal to the pressure in the inlet channel 11, and during the pumping stroke the pressure in the pump chamber 2 acting on the membrane 8 from the side of the hydroline 7 opens the discharge valve and the working medium flows into the outlet channel 6. Thus, when the pressure at the pump inlet is higher than the outlet pressure, the normal operation of the pump is ensured. When the outlet pressure is greater than the inlet pressure of the pump, the diaphragm 8 of the discharge valve does not provide reliable overlap of the seat 9 during the suction stroke, however, at this time the pumping chamber 2 is cut off from the outlet channel 6 by the check valve 12, and therefore at the outlet pressure, greater pressure at the pump inlet, a normal duty cycle is also ensured. Thus, by using an additional check valve 12 installed in the hydraulic line 7 to the successively controlled discharge valve, the pump is normally operated at any pressure drop across the pump. This eliminates the reverse or direct spontaneous flow of the working medium, which ensures high accuracy of dosing. Claims of Invention A volumetric pump comprising a pump chamber with a displacer, in fluid communication with an outlet channel, in which a controllable discharge valve is installed, equipped with a stop membrane, an associated central part with a pressure valve seat, and a control chamber located on the opposite side of the membrane side and communicated with the pump inlet channel, characterized in that, in order to extend the functionality by enabling the pump to operate at alternating differential pressure, the pump is additionally equipped with a check valve installed in the hydraulic line of the sequentially controlled discharge valve and normally closed for the passage of the working medium from the outlet channel to the pump chamber. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2692426 / 25-06, cl. F 04 B 21/02, 1978.