RU2578757C1 - Liquid pump with electromagnetic drive - Google Patents

Abstract

FIELD: pumps.

SUBSTANCE: invention relates to low-capacity of pump machines. Pump consists of cylinder 7 made from nonmagnetic material, to Induction coil 8 connected to source of pulse current. Inside cylinder 7 with radial clearance is installed piston 9, which is solenoid core sprung 10 in axial direction and made from magnetically soft steel or high-coercivity magnetic material. Piston 9 has hole 11 with rectangular cross-section, in which there are three pairs of rigid 12 and 13 flexible plates. Flexible plate 13 has length towards the channel axis larger than that of rigid plate 12. When the pulse voltage on winding coil 10 in it creates a variable magnetic field with specified frequency, drawing piston 9, which makes oscillating motion along the axis of cylinder 7. At reciprocal (oscillatory) motion piston 9 in the pump occurs pulsating fluid flow in direction of feed pump.

EFFECT: higher efficiency and pressure pump.

1 cl, 6 dwg

Description

The invention relates to the field of low-cost pumping machines used primarily for pushing liquids in closed cooling systems, which are subject to high requirements for the absence of vibration, compactness, reliability and a high resource of non-stop operation.

A liquid pump with an electromagnetic drive is known, comprising a cylinder with at least one piston spring-loaded in the axial direction, arranged at least one part of it in the form of an electromagnet core, and installed around the cylinder, at least one electric coil connected to a current source (see book: Bolshtyansky A.P., Bely V.D., Doroshevich S.E. Compressors with gas-static piston centering. - Omsk: Publishing House OmSTU, 2002, p. 89 , Fig. 5.3).

Closest to the claimed technical device is a liquid pump containing a cylinder placed in it with a radial clearance of at least one piston, spring-loaded in the axial direction, at least part of which is made in the form of an electromagnet core, and is installed around the cylinder, according to at least one electric coil connected to a current source, characterized in that a through hole is made in the piston body along its axis, the surface of which has at least one cone-shaped protrusion p directed inside the hole with the apex in the direction of fluid flow (see, for example, RF Patent No. 127830, IPC F04B 17/04 according to application No. 2012147413/06, published on 05/10/2013, Bull. No. 13).

A disadvantage of the known designs is their low efficiency, associated with the inability to create a sufficiently large pressure drop (pressure), which is necessary for pushing the fluid through long pipelines or through heat exchangers having narrow channels.

The technical result of the invention is to increase the efficiency of the pump by increasing the pressure created by it.

This technical result is achieved by the fact that in the known liquid pump, which contains a cylinder placed in it with a radial clearance, at least one piston, spring-loaded in the axial direction, at least part of which is made in the form of an electromagnet core, and around the cylinder at least one electric coil connected to a current source is installed, and a through hole is made in the piston body along its axis, the surface of which has at least one conical protrusion the inside of this hole with the apex in the direction of fluid flow, according to the claimed invention, the through hole in the piston is made with a rectangular cross-section, and the conical protrusion is formed by at least one pair of rigid and flexible plates mounted on opposite sides of the hole, the flexible plate having a length in the direction of the channel axis is larger than the rigid plate, and is located close to the rigid plate, in contact with it on a plane from the side facing to the side in the direction of flow of fluid bones.

The invention is illustrated by drawings, where

- in FIG. 1 shows a diagram of a pump installation in a closed cooling system of an object;

- in FIG. 2 shows a longitudinal section of a pump with an electric coil;

- in FIG. 3 shows a cross section of the pump in the area of the plates;

- in FIG. 4 and 5 show the operation of the pump, and in FIG. 6 is a variant of a pump with two movable cores.

The cooling circuit consists (Fig. 1) of a heat source 1, pipelines 2, heat exchangers 3 and 4, pump 5 and its power source 6.

The pump (Fig. 2) consists of a cylinder 7 made of non-magnetic material around which an induction coil 8 is fixedly fixed, connected to a current source (not shown conventionally in the figure). Inside the cylinder 7, with a possibility of free sliding along it with a radial clearance, a piston 9 is installed, which is the core of the electromagnet, axially spring-loaded with a spring 10 in the direction of the fluid flow and made of soft magnetic steel or of a high-cermet magnetic material.

The piston 9 has a through hole 11 with a rectangular cross section along its axis (see also Fig. 2), in which three pairs of rigid 12 and flexible 13 plates are mounted, mounted on opposite sides of the hole 11, and the flexible plate 13 has a length towards the axis the channel is larger than the rigid plate 12, and is located close to the rigid plate 12, in contact with it on a plane from the side facing to the side in the direction of fluid flow, which is shown by arrows. Each pair of plates 12 and 13 forms a cone-shaped protrusion in the hole 11 directed inwardly of this hole by a vertex in the direction of fluid flow.

The cooling system (Fig. 1) works as follows. The pipe 2 is filled with coolant, is tight, and the cylinder 7 of the pump 5 is part of this pipe. From an alternating or pulsating voltage source 6, current is supplied to the pump 5, and the pump pumps the coolant along the circuit formed by the pipe 2. In this case, heat is taken from the source 1 and removed to the environment through the surfaces of the heat exchangers 3 and 4. The direction of fluid flow is indicated by shaded arrows .

When a pulsating voltage is applied to the winding of the coil 10, an alternating magnetic field is created in it, which draws the piston 9 at a given frequency, which, therefore, taking into account the action of the spring 10, oscillates along the axis of the cylinder 7.

In the process of moving inside the coil 8 (Fig. 4), the fluid flows almost freely relative to the piston 9 through the hole 11, since the vortices formed in the flooded cavities of the vortices 12 rotate in the direction of fluid movement and practically do not impede its movement relative to the piston 9 in the pump feed direction (to the right in the picture). That is, the piston 7 essentially just moves from right to left (shown by arrow) in a liquid medium. In this case, the flexible plates 13 are bent by the liquid and do not impede the movement of the piston 9.

When the piston 7 returns (Fig. 5) under the action of the spring 10, when the current decreases or when the current pulse is removed (the current is zero) and the pulling force of the coil 8 becomes small or completely disappears, the piston 9 moves to the right (shown by an arrow), moving to fluid medium. In this case, the vortices arising in the flooded cavities impede the return flow of the liquid, since they are swirled in the direction opposite to the possible movement of the liquid, and the liquid is carried away by the piston 7 towards the pump supply. Flexible plates 13, which are pressed against the rigid plates 12, which directly “push” the liquid, bending toward the axis of the piston 9 and reducing the clearance of the channel 11, also contribute to this.

Thus, during the reciprocating (oscillatory) movement of the piston 9, a pulsating fluid flow occurs in the pump in the direction of pump supply.

A similar effect is created when using two pistons of the same mass (Fig. 6), supported by one spring. Here, the inertia forces of the oppositely directed movement of the two pistons are balanced and the system practically does not create vibrations.

The work of the flexible plates 13 significantly increases the productivity and pressure of the pump, which allows it to be used for pumping fluid through long pipelines and through narrow channels of heat exchangers.

Claims (1)

A liquid pump comprising a cylinder with at least one piston axially spring loaded in it with a radial clearance, at least part of which is made in the form of an electromagnet core, and at least one electric coil is installed around the cylinder, connected to a current source, and in the piston body along its axis a through hole is made, the surface of which has at least one cone-shaped protrusion directed inside of this hole by an apex in the direction of fluid flow and, characterized in that the through hole in the piston is made with a rectangular cross section, and the cone-shaped protrusion is formed by at least one pair of rigid and flexible plates mounted on opposite sides of the hole, the flexible plate having a length longer than the channel axis a rigid plate, and is located close to the rigid plate, in contact with it on a plane from the side facing to the side in the direction of fluid flow.

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