SU170178A1 - - Google Patents

Description

UNIT FOR DOSING LIQUID SUBSTANCES

torus speeds installed in the drive pistons (not shown in the diagram). The unit is useful in the chemical industry, as well as in other fields, for multi-component dosing.

The unit works as follows.

First, by adjusting the stroke of the pistons or the number of strokes (in the presence of a speed variator), the feed rate (dose) is common for all cylinders, then the bellows 14 is displaced relative to the cam 9, and the liquid is poured from one bellows to another, resulting in the required opening moment close one of the valves of each cylinder. So, for example, if the position of the bellows is adjusted so that by the time of the injection stroke of the piston and throughout its duration the valve 3 is closed, then the maximum flow rate is reached, and if it is open, it is zero (there will be no dosage).

To control the operation of valves, except the bellows system, can be applied

electrical, mechanical, hydraulic and pneumatic systems.

Subject invention

Claims (2)

I. An apparatus for metering liquid substances, made in the form of several piston pumps with group regulation of the magnitude of the flow of cylinders, characterized by so that, in order to change the feed rate of its individual cylinders, it is equipped with a device for controlling the time of opening and closing of the cylinder valves during the working cycles of the pistons. 2. The assembly according to claim 1, characterized in that the device for controlling the time of opening and closing of the valves is a cam located on the drive shaft and several pairs of communicating with each other bellows, with one of the bellows of each pair connected to the valve, and the other mounted on the cam with the possibility of displacement relative to it. Known units for metering liquid substances, made in the form of several piston pumps with group control of the magnitude of the flow of cylinders. The proposed unit differs from the known ones in that it is made with the possibility of changing the feed rate of its individual cylinders depending on the ratio of the components to be dosed. The advantage is achieved due to the fact that the unit is equipped with a device for regulating the moment of opening and closing of the cylinder valves during the working cycles of the pistons. Such a device can be made in the form of a cam located on the drive shaft and several pairs of communicating bellows. Moreover, one of the bellows of each pair should be connected to one of the valves, and the other should be mounted on the cam with the possibility of displacement relative to it. FIG. 1 shows schematically the described unit; in fig. 2 is a mechanism for changing the timing of opening and closing of the cylinder valves. The unit is made up of several pumps, each of which contains a cylinder 1 with a suction 2 and an injection 5 valves, a piston 4 connected to a connecting rod 5, which interacts with a liner 6, which is mounted on the shaft 7. The shaft is mounted to several Sj knees according to the number of pumps inclined with respect to the shaft axis, and the liners 6 located on them have the ability to shift, adjusting thus the stroke of the pistons and, consequently, the group value of the supply of dosing components. At the end of the shaft there is a device for adjusting the moment of opening and closing. one of the cylinder valves and thus adjusting the feed rate of each cylinder depending on the ratio of the components. It includes a cam 9 enclosed in a housing 10 with a cutout 11, bellows systems corresponding to each cylinder, consisting of two interconnected hoses 12 bellows 13, 14. The bellows 13 is located on the stem of the discharge valve 3, and the bellows 14 - on the cam 9 and enclosed in a cup / 5 with a cap 16 screwed onto it. The cup 15 is inserted into the sleeve housing 10 of the sleeve 17, which is provided with a handle 18, designed to bias the bellows 14 relative to the cam 9. /eight IS