RU175168U1 - PUMP INJECTOR DOSING - Google Patents

Abstract

The invention relates to the oil and gas and chemical industries, in particular, to devices for introducing a chemical reagent into a flowing stream in a pressure pipeline. An object of the present invention is to provide a device for increasing the accuracy of dispensing chemical reagents into a high pressure pipeline. The technical result is a liquid dosing accuracy. The technical result is achieved in that the injection metering pump comprises a housing including a cavity for the piston and a cavity for For pumping fluid with inlet and outlet valves and a bellows, a piston made to move inside the cavities, a hermetically sealed bellows, made with an unclosed closed end and an end with a through hole for the piston rod to pass, and the bellows cavity is filled with incompressible liquid, while additionally containing a spring covering the piston rod and a spring between the bottom of the fluid pumping cavity and the loose closed end of the bellows. 2 s.p. f-ly, 1 ill.

Description

The utility model relates to the oil and gas and chemical industries, in particular to devices for introducing a chemical reagent into the current stream in a pipeline operating under pressure.

In the pipeline with the product (oil or gas), it is necessary to add various liquid chemical reagents, such as odorants, methanol, inhibitors, etc. At the same time, the exact dosage of their quantity must be observed.

A device for dispensing liquids using a bellows as an intermediate element between the actuator and the working chamber of the membrane type. (Copyright certificate 1679052, priority date 02.01.89, F043 13/00, publ. 23.09.91). The disadvantage of this device is the lack of a direct dependence of the dose on the amount of movement of the bellows, which prevents accurate dosing of the liquid.

Known bellows oil-filled pump (German patent No. 2910328, priority date 03/16/1979, publ. 09/25/1980), having a valve on the stem inside the bellows to prevent the accumulation of air bubbles in the oil inside the bellows.

The pump has a plunger at the end of the bellows. A reciprocating rod moves the plunger in the chamber between the inlet and two discharge check valves. The volume inside the bellows and the space around the stem is filled with oil flowing through the third check valve. The portion of the stem passing through the inside of the bellows contains a valve disc. When the bellows is compressed, the disks are in contact with the end surface in the pump housing, while blocking the volume inside the bellows from the space around the stem.

Known pump with pneumatic drive for pumping media (US application No. 2016123313, priority date 11/05/2014, publication date 05/05/2016). The pump for pumping fluids includes a pump housing with two cavities, a piston moving between two cavities of the pump housing, a bellows located inside the second cavity, having a first closed end and a second open end opposite to it near the piston hollow shaft. The bellows expands and contracts in the second cavity of the housing during operation of the pump. An incompressible fluid fills the space inside the bellows. The chamber for the pumped medium is located in the second cavity on the second side of the bellows and is configured to increase and decrease the volume of the chamber. The piston includes a piston head having a first side and an opposed second side. The first side of the piston head has a first surface area. The piston head moves in the first cavity of the pump housing. The elongated piston shaft has an end surface opposite the piston head having a second surface area smaller than the first surface area of the first side of the piston head.

The disadvantages of the known solutions are:

the need to supply two control gas lines (cavity above / below the piston);

the presence of a valve for venting air from the working cavity of the pump, which entails leakage of the pumped product. To ensure the operation of the pump, it is necessary to discharge air from the working cavity of the pump;

a variable stroke of the working body, from which it follows that to accurately determine the amount of pumped product, it is necessary to install a counter.

The objective of the present invention is to provide a device that improves the accuracy of the dosing of chemicals in the high pressure pipeline.

The technical result is the accuracy of the dosing of the liquid.

The technical result is achieved by the fact that the injection metering pump contains a housing including a cavity for the piston and a cavity for pumping liquid with inlet and outlet valves and a bellows, a piston made with the ability to move inside the cavities, a hermetically sealed bellows made with an unclosed closed end and end with a through hole for the passage of the piston rod, and the bellows cavity is filled with an incompressible fluid, while further comprising a spring covering the piston rod, and a spring ezhdu bottom of the cavity for pumping fluid and loose closed end of the bellows.

The inventive utility model is presented in the figures:

FIG. 1 is a sectional perspective view of an injection metering pump.

The injection dosing pump comprises a housing 1 made of stainless steel, containing two cavities: a cavity 2 in which the piston 12 and the piston rod 5 move, a cavity 3 for pumping liquid, an inlet valve 9 and an outlet valve 10 to the cavity 3, the piston 12 is made of stainless steel, stem 5, moving between cavities 2 and 3, a bellows 4 made of fluoroplastic, having a cavity 6 filled with an incompressible fluid, such as hydraulic oil and hermetically isolated from the cavity 2 and 3 by a cover 11. Side surfaces of the bellows body 4 are corrugated. To preload the working body 12, a spring 7 is contained around the stem 7. To preload the bellows 4, a spring 8 is located between the bottom of the cavity 3 and the lower non-fixed end of the bellows 4.

The rod 5 is made with the possibility of reciprocating movement along the vertical axis of the pump inside the cavities 2 and 3.

It is preferable to manufacture the bellows from a material resistant to aggressive media, for example fluoroplastic. The edge of the bellows is sandwiched between the pump housing and cover 11, which ensures its sealing.

Utility Model Implementation

Pump injection metering works as follows.

The space of the cavity 3, located on the outside of the bellows 4, during operation of the pump is filled with the pumped liquid.

The reciprocating movement of the piston 12 with the rod 5 is carried out under the action of an electromagnet or by supplying a control gas to the cavity above the piston. Under gas pressure or under the action of an electromagnet, the piston 12 with the rod 5 moves down along the vertical axis of the pump. In this case, the amount of space inside the bellows 4 is reduced. Since the space inside the bellows 4 is filled with an incompressible fluid and the pressure in the entire cavity 3 is the same, the bellows 4 begins to stretch by moving the loose end. The volume of the space of the cavity 3 from the outside of the bellows 4 is reduced and the pumped product is squeezed out of it. The pressure of the pumped liquid after the pump rises several times.

During operation of the pump, the bellows expands and contracts alternately, thereby reducing and increasing the volume of the space of the cavity 3 from the outside of the bellows. Spring 8 serves to tighten the bellows and bring it to its original position.

The movement of the piston 12 and the loose end of the bellows 4 are rigidly connected, which ensures the accuracy of the dosing of the pumped liquid.

Upon termination of the impact of the piston 12 through the spring 7 is returned to its original position. The spring 8, in turn, also assumes its original position, thereby allowing the bellows to compress and assume its original position. The space on the outside of the bellows in the cavity 3 increases and the pumped product is pumped into it. To ensure the product current at the inlet and outlet of the cavity 3, check valves 9 and 10 are installed, respectively.

The magnitude of the movement of the working body of the pump is constant, and is determined by the design of the pump (the extreme positions of the working body 12), therefore, for each stroke the same amount of pumped product is dosed. Dose control is provided by changing the frequency of movement of the working body 12.

The advantages of the claimed utility model.

Due to the rigid relationship between the movement of the working body and the loose end of the bellows, the dosing accuracy of the pumped liquid is ensured.

In the case of using control gas, it is required to provide only one line of control gas, which halves its consumption.

By maintaining equal pressure inside the bellows and in the space on its outside, the use of a bellows with a minimum wall thickness is required.

The pump operates without leakage of the working environment, which allows you to pump toxic media.

Claims (3)

1. Injection metering pump, comprising a housing including a cavity for the piston and a cavity for pumping liquid with inlet and outlet valves and a bellows, a piston made with the possibility of moving inside the cavities, a hermetically sealed bellows, made with an unclosed closed end and an end with a through hole for the passage of the piston rod, while the bellows cavity is filled with an incompressible fluid, characterized in that it further comprises a spring covering the piston rod and a spring between the bottom part fluid for pumping fluid and an unsecured closed end of the bellows. 2. The injection metering pump according to claim 1, characterized in that the piston is moved by an electromagnet or by supplying gas to the cavity of the pump housing above the piston. 3. The injection metering pump according to claim 1, characterized in that the bellows is made of fluoroplastic material.

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