RU31265U1 - Pump - Google Patents

Description

2003102750

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The utility model relates to the field of hydraulic transport mainly to systems with elastic working bodies and can be used in pumps for pumping fluids containing abrasive and chemically aggressive components.

A well-known mud pump, designed to supply flushing fluid to the well, containing channels with valve devices for the transported medium (drilling fluid) and a cylinder-piston group. (G.V. Alekseevsky, Drilling rigs of Uralmashzavod, M., Nedra, 1981, pp. 61 - 90,)

The mud pump is designed to pump fluids under high pressure, which meets the objectives of the utility model. However, for the purpose of pumping fluids with a significant content of abrasive components, such a pump has the disadvantage of insecurity of the cylinder-piston cavity (chamber) from the abrasive components, which quickly leads the pump to an inoperative state.

A diaphragm-piston pump is also known, in which the fluid is located in two cavities isolated from each other, containing channels with valve devices for the transported medium and a cylinder-piston chamber for buffer fluid, between which a flat diaphragm is mounted, fixed to the housing in a vertical plane. (See the Dutch Brochure GEHO PUMPS brochure at: http://www.miningtechnology.com/cotractors/pumps/geho/)

In the known pump, the pistons act on the nonsense pumped by the intermediate fluid volume, which does not contain abrasive components, since this fluid is separated from the transported (pumped) medium by an elastic partition (diaphragm), which changes shape under the influence of the pressure of the fluid supplied by the piston. PUMP

The disadvantage of this pump is the fragility of the diaphragm due to the constant change in the sign of its bend in the places of termination during operation.

This pump is selected as a prototype.

The purpose of the utility model is to increase the reliability of the pump by increasing the durability of the diaphragm of the pump, reducing the degree of wear of sealing devices and rubbing surfaces.

This goal is achieved by the fact that in the known pump containing a cylinder-piston chamber separated by a diaphragm from a system of valves installed in the channel for the transported medium, the diaphragm is made in a pudgy shape and fixed in the housing for it in a horizontal plane with the possibility of working deformation in the vertical direction.

In addition, the diaphragm is equipped with a device for monitoring and controlling its vertical position, and the channel between the diaphragm and the valve system has a cavity for the locking column of the transported medium, and the volume of this cavity is greater than the volume of the piston-cylinder chamber.

The system for separating fluids with a saddle-shaped diaphragm is not obvious, since the relatively free form of the diaphragm, in the case of its known fastening to the body in a vertical plane, creates the illusion of its uncontrollability.

An example of the implementation of the utility model and its essence are illustrated by a schematic representation of the device.

The pump contains a cylinder 1, a piston 2, a cylinder-piston chamber 3, a saddle-shaped diaphragm 4, a valve system, an inlet 5 and an outlet 6 installed in the channel 7 for the transported medium 8. The diaphragm is fixed in the housing 9 in a horizontal plane 10, and the middle part is connected to a device 11 for monitoring and controlling its vertical position.

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12 is larger than the volume of the cylinder-piston chamber 3. In the cavity 12, in its lower part, a “trap 14 for large solid inclusions of the transported medium 8 is made.

The cylinder piston chamber 3 and the entire cavity to the diaphragm is filled with a buffer liquid 15, for example, water.

The directions of possible mixing; the parts of the pump are shown by arrows: A - mixing of the piston, B - mixing of the inlet valve, C - moving the output valve, G - moving the diaphragm.

The utility model works as follows.

First, the cylinder-piston chamber 3 and the entire cavity up to the diaphragm 4 are filled with buffer liquid (water) 15, so that when moving the piston 2 and water is displaced from the chamber 3, the diaphragm 4 is moved to its lower position and displaced the whole transported medium through valve 6 from housing 8. While filling the specified cavity with water, the diaphragm 4 is held by the device 11.

Then, the transported medium is fed into the cavity 12 and the piston is driven back and forth. The buffer fluid 15, practically in a constant volume, begins to act through the diaphragm 4 on the transported medium 8 and pump it through the valves 5 and 6.

In the process of pumping medium 8, air bubbles may occur near valves 5 and 6, which are undesirable in close proximity to the diaphragm 4, since the compressibility of the formed air gap can reduce the efficiency of pumping medium 8. In order to prevent this effect, a transported column is formed in cavity 12 environment blocking access possible

air gap to the diaphragm 4.

The advantage of the utility model in comparison with the prototype is that the durability of the diaphragm increases due to the exclusion of its sharp bends, in places of attachment to the body, during operation.

Claims (3)

1. A pump containing a cylinder-piston chamber, separated by a diaphragm from a system of valves installed in the channel for the transported medium, characterized in that the diaphragm is pear-shaped and fixed in the housing for it in a horizontal plane with the possibility of working deformation in the vertical direction. 2. The pump according to claim 1, characterized in that the diaphragm is equipped with a device for monitoring and controlling its vertical position. 3. The pump according to claim 1, characterized in that the channel between the diaphragm and the valve system has a cavity for the locking column of the transported medium, and the volume of this cavity is greater than the volume of the cylinder-piston chamber.