KR19980014791A - Reciprocating electromagnetic pump - Google Patents

Abstract

The present invention relates to a reciprocating-type electromagnetic pump which is small in size and high in output, energy efficiency, durability and can be manufactured at low cost.

The electromagnetic pump according to the present invention includes one longitudinal cylinder, a permanent magnet inserted into the cylinder left / right so as to have a working space and slidable to the left and right, and a permanent magnet connected to the left / A pair of suction and discharge lines, a pair of suction and discharge valves installed in a pair of suction and discharge lines for passing the fluid only in one direction, and a pair of suction and discharge valves disposed in the middle of the outer circumference of the cylinder, And a solenoid for reversing the polarity and reversing the polarity periodically to move the permanent magnet in the cylinder to the left and the right. The fluid is sucked and discharged alternately through the suction pipe and the discharge pipe in accordance with the left / right movement of the permanent magnet .

Therefore, the present invention has a simple structure so that it has high durability and is easy to manufacture and is inexpensive to manufacture. When a suction force by a solenoid interacts with a magnetic force of a permanent magnet constituting a piston, a suction force and a repulsive force are generated in a moving direction of the piston, The driving force for the fluid and the pumping ability of the fluid are improved.

Description

Reciprocating electromagnetic pump

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-magnetic pump, and more particularly, to an electromagnetic pump which is small in size and high in output, energy efficiency, durability and low cost.

Generally, a fluid pump for transporting a fluid such as a gas or a liquid generally uses a motor as a power source.

In other words, the motor-driven system has a structure in which the impeller is rotated by using the rotational power of the motor so that one gas or liquid can be transferred to the other side. However, the piston connected to the rotor of the motor and the crank shaft reciprocates in the cylinder The check valves at both ends are alternately opened and closed to transfer the fluid.

However, since such a fluid pump basically has a motor, it is inevitable that the energy efficiency for the pressure transmission is inevitably degraded. Also, in the method using the piston and the cylinder, the noise is structurally changed in the process of converting the rotational motion of the motor into the linear reciprocating motion by the crank And the manufacturing cost is high and the volume is increased because the structure is complicated.

To improve this, Japanese Unexamined Patent Publication (Kokoku) No. 56-66467 uses a commercial AC power source to repeatedly suck and repel the permanent magnet by the electromagnet, thereby repeating the suction and extrusion of the object to be conveyed, (Electromagnetic) fluid pump having a structure as shown in Fig.

Since the fluid pump does not have separate motor power, it is possible to increase the efficiency and downsize the size of the fluid pump. However, since the fluid pump is located outside the stroke of the permanent magnet reciprocating with attraction and repulsion of the electromagnet, / ≪ / RTI >

Therefore, there is a relatively large distance between the permanent magnet and the electromagnet reciprocating in the cylinder, and in order to obtain the starting torque necessary to change the direction of motion in this state, a large amount of electric power is consumed which can generate electromagnetic force inversely proportional to the square of the distance . As a result, efficiency is low, and in most cases the power available to the electromagnet is extremely limited, so the output of such a fluid pump is small. Therefore, these fluid pumps are mainly used for toys and simple facilities, and do not have the economical efficiency to be utilized for industrial use.

In order to solve the problems of the prior art described above, another prior art has been proposed by the present inventor as a utility model publication No. 96-3409. In the proposal disclosed in the Utility Model No. 96-3409, as shown in Figs. 1 and 2, the permanent magnets 1 are mounted on the outer circumferential portion of the longitudinal cylinder 3 reciprocating in the longitudinal direction at predetermined intervals in the longitudinal direction 5D are arranged so that the entire outer circumferential portion of the cylinder in the longitudinal direction is alternated to the same N-pole or S-pole electromagnet in accordance with the same alternating-current voltage AC applied to each of the electromagnets 5A-5D . 1 and 2, reference numeral 7 denotes a suction pipe, 9 denotes a discharge pipe, 11 denotes a suction valve, 13 denotes a discharge valve, 15 denotes a limit switch, and 17 denotes a drive control unit.

The distance between the permanent magnets and the electromagnets can be kept to a minimum so that the electromagnets of the electromagnets 5A to 5D applied to the permanent magnets 1 strongly influence the efficiency, Which can be widely used.

However, the electromagnet of the fluid pump has a structure in which the four electromagnets 5A to 5D each have a drive coil wound around a core protruding along the longitudinal direction of the cylinder 1. [

As a result, it is suitable for a large fluid pump. However, in the case of a small-sized fluid pump, since the driving coils of the electromagnets, which can be divided into a plurality of small portions, are limited, the length of the driving coils and the amount of current flowing therethrough are relatively small The electromagnetic force of the electromagnet is also small, and the output of the fluid pump is also small. Furthermore, coil winding of the electromagnet is difficult, resulting in an increase in manufacturing cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reciprocating-type electromagnetic pump which is compact and has high output, energy efficiency, durability and low cost.

1 is a longitudinal cross-sectional view of a conventional electronic fluid pump;

Figure 2 is a longitudinal section of the fluid pump shown in Figure 1;

FIG. 3 is a partial longitudinal cross-sectional view of a reciprocating electromagnetic pump according to the present invention; FIG.

FIG. 4 is a longitudinal section of the electromagnetic pump shown in FIG. 3; FIG.

5 (a) and (b) are explanatory views for explaining the fluid pumping action of the present invention.

6 (a) and 6 (b) are cross-sectional views showing the structure of a piston according to another embodiment of the present invention.

Description of the Related Art [0002]

21: piston 23: cylinder

25: solenoid 27A, 27B: left / right suction pipe

29A and 29B: Left and right discharge pipes 31A and 31B: Left and right suction valves

33A and 33B: Left and right discharge valves 35A and 35B: Left and right limit switches

37: drive control unit 39:

41: right space 43: sealing ring

In order to achieve the above-mentioned object, the present invention provides a cylinder-type air conditioner, comprising: a single longitudinal cylinder; A pair of suction pipes and a discharge pipe respectively connected to the left and right operating spaces of the cylinder, and a pair of suction valves installed in the pair of suction pipes and the discharge pipe to pass the fluid only in one direction, And an exhaust valve disposed in the middle of the outer circumference of the cylinder and having an opposite polarity to each other on both sides of the cylinder in response to an alternating voltage applied thereto and having an alternating polarity periodically to generate an alternating electromagnetic force for moving the piston in the cylinder to the left / And the left and right solenoid valves Wherein suction and discharge of the fluid are alternately performed through the suction pipe and the discharge pipe connected to the working space.

According to the present invention, the piston is formed as a rod as a whole, and is composed of a plurality of division magnets having a hollow portion in the longitudinal direction at the center portion or a hollow portion. The outer peripheral portion and the inner peripheral portion of each of the divided magnets have mutually opposite polarities. For example, if the outer peripheral portion is an N pole, the inner peripheral portion is set to be an S pole, and if the outer peripheral portion is an S polarity, Therefore, the outer peripheral portion of the piston as a whole has a magnetic pole of N pole or S pole.

The solenoid is constituted by a drive coil wound along the longitudinal direction on the outer circumference of the cylinder by a predetermined length.

As described above, in the present invention, since the solenoid having the drive coil wound around the outer periphery of the cylinder is provided in the outer periphery of the cylinder, when the small-diameter cylinder is used for a small-diameter pump, its structure is simple, , It is possible to relatively increase the number of turns and drive current of the drive coil constituting the solenoid, and the start torque to the piston is increased to improve the energy efficiency and the pumping ability of the fluid.

[Example]

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a longitudinal sectional view of a reciprocating type electromagnetic pump according to the present invention, FIG. 4 is a longitudinal sectional view of an electromagnetic pump shown in FIG. 3, and FIG. 5 (a) and (b) 6 (a) and 6 (b) are longitudinal sectional views showing the structure of a piston according to another embodiment of the present invention.

3 and 4, in the fluid pump of the present invention, a piston 21 made of a rod-like permanent magnet is inserted into a cylindrical cylinder 23 in the longitudinal direction so as to be movable left and right, Left and right suction pipes 27A and 27B communicated with the side of the article to be pressure-fed and left and right discharge pipes 29A and 29B connected to the place where the articles are fed are connected to the left and right sides of the suction pipe 23, Right suction valves 31A and 31B, and left and right discharge valves 33A and 33B are provided in the discharge pipe.

Left and right limit switches 35A and 25B for detecting the approach of the piston 21 are disposed at both ends of the cylinder. The detection signal of the switch changes the polarity period of the commercial AC input signal, And is applied to the drive control unit 37 for controlling the amount of power applied and the drive period.

The output of the drive control unit 37 is connected to a solenoid 25 which is wound in a circular shape in a longitudinal direction over a predetermined length so that the piston 21 can smoothly reciprocate in the middle of the outer periphery of the cylindrical cylinder 23 . Reference numeral 43 in the drawings denotes a sealing ring.

As shown in FIG. 4, the piston 21 is formed of three divided magnets 21A-21C having a circular rod as a whole. The piston 21 has an S-pole of the outer periphery and an N-pole of the inner periphery, . Therefore, in this case, the outer peripheral portion of the piston 21 has the S pole.

3 and 4, the piston 21 of the present invention is divided into three divided magnets. However, as shown in FIG. 6 (a) and FIG. 4, four divided magnets 51A- Or N (N is a positive integer) pieces of dividing magnets. It is of course possible to magnetize the outer peripheral portion to have an N pole and the inner peripheral portion to have an S pole.

In the case where the piston has a hollow portion, it is necessary to seal the two side inlets in order to prevent the fluid from moving.

Furthermore, it is of course possible to employ a structure in which the central portion of the divided permanent magnets 53A to 53D has no through hole as shown in Fig. 6 (b).

That is, the permanent magnet constituting the piston 21 of the present invention can be any structure as long as the surface of the outer peripheral portion has the same N pole or S pole as a whole.

Hereinafter, the operation of the fluid pump of the present invention will be described in detail with reference to FIGS. 5 (a) and 5 (b).

5 (a), it is assumed that the outer periphery of the permanent magnet constituting the piston 21 has an S pole and the central portion has an N pole, and the current flow of the drive coil constituting the solenoid 25 The magnetic line of force by the solenoid 25 is formed in a direction in which the magnetic line of force comes out from the left side of the solenoid and enters the right side when the magnetic line of the solenoid 25 flows from the lower side of the cylinder 23 to the upward direction.

In this case, since the piston 21 having the S polarity at the outer periphery has the same polarity as that of the S pole formed at the right side of the solenoid 25, a repulsive force is generated, and the polarity opposite to the N pole formed at the left side of the solenoid 25 So that a suction force is generated between them, and the piston 21 moves rapidly in the direction in which the suction force acts, that is, to the left side of the cylinder 23.

The fluid that has flowed into the space 39 on the left side of the piston 21 of the cylinder 23 is discharged through the left discharge valve 33A and the discharge pipe 29A and the left suction valve 31A is kept closed The right suction valve 31 is opened as the pressure in the cylinder right space 41 is lowered and the object to be conveyed is sucked into the right space 41 of the cylinder 23.

When the piston 21 moves to the left end of the cylinder 23, the left limit switch 15A generates a signal and outputs the signal to the drive control unit 37. When the drive control unit is operated, the current applied to the solenoid 25 The flow direction is changed in the direction opposite to the fifth figure (a) as shown in Fig. 5 (b), and the direction of the magnetic line of force is also reversed.

In this case, that is, when the piston 21 is located on the left side of the cylinder 23, the outer periphery of the piston 21 has the same polarity as the S pole formed on the left side of the solenoid 25, The polarity of the polarity of the polarity opposite to that of the polarity of the polarity of the polarity of the polarity of the polarity of the polarity is generated. As a result, the piston 21 moves in the direction in which the suction force acts, that is, to the right side of the cylinder 23.

Therefore, the fluid flowing into the right space 41 of the cylinder 23 is discharged through the right discharge valve 33B and the discharge pipe 29B. At this time, the right suction valve 31B is kept closed, (31A) is opened as the pressure in the left space (39) of the cylinder is lowered, and the object to be conveyed is sucked into the cylinder (23).

As a result, the fluid that has flowed into the cylinder 23 due to the reciprocating motion of the piston 21 is pressure-fed through the discharge pipes 33A and 33B.

On the other hand, when the piston 21 moves to the right end of the cylinder 23, the right limit switch 15B generates a signal and outputs the signal to the drive control unit 37. When the drive control unit is operated to change the current applied to the solenoid 25 The flow direction is changed as shown in FIG. 5 (a), so that the fluid pumping action is repeatedly performed.

In this case, in the present invention, since the driving coil constituting the solenoid 25 has a structure in which the driving coil is wound in the longitudinal direction along the outer periphery of the cylinder 23 in the middle of the cylinder 25, A relatively large number of coils can be wound. Therefore, in the case of having the same size, the number of turns of the drive coil is increased and the output can be configured to be relatively high.

On the contrary, when winding the drive coils of the same length, a coil having a large diameter can be used, so that the output of the pump can be increased as the drive current increases.

In the case of constructing the solenoid 25 by using coils having the same length and diameter, the case of winding along the longitudinal direction of the cylinder 23 as in the present invention is relatively longer than the case of winding along the longitudinal direction, 21) of the magnetic field generating force is larger. As a result, the energy consumption efficiency is greatly improved as compared with the prior art.

Further, in the present invention, the entire outer surface of the reciprocating piston 21 is magnetized in the same polarity, and the driving coil wound around the outer periphery of the cylinder 23 surrounding the solenoid 25 forms the solenoid 25 so that the polarity of the solenoid is reversed The suction force and the repulsive force between the instantaneous piston 21 and the opposite ends of the solenoid 25 are generated in a direction in which the piston must be moved more than the conventional structure. Therefore, a large starting torque is required to change the direction of motion of the piston 21, thereby improving the pumping performance.

As described above, in the present invention, since the solenoid having the drive coil wound around the outer periphery of the cylinder is provided in the outer periphery of the cylinder, when the small-diameter cylinder is used for a small-diameter pump, its structure is simple, , It is possible to relatively increase the number of turns and drive current of the drive coil constituting the solenoid, thereby improving energy efficiency and fluid pumping ability.

Also, when the suction force by the solenoid interacts with the magnetic force of the permanent magnet constituting the piston, a suction force and a repulsive force are generated in the moving direction of the piston, so that the driving force for the piston and the pumping ability of the fluid are improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

Claims (4)

One longitudinal cylinder, A piston which is inserted into a length of the inner cylinder left / right so as to have a working space and which is slidable leftward / rightward and is made of a permanent magnet having magnetic poles of opposite polarities between the outer periphery and the center, A pair of suction pipes and discharge pipes respectively connected to the left and right operating spaces of the cylinder, A pair of suction and discharge valves provided in the pair of suction pipes and the discharge pipe to allow the fluid to pass through only one direction, And a solenoid disposed in the middle of the outer periphery of the cylinder and generating an alternating electromagnetic force for reversing the polarity of the piston in the cylinder so as to move the piston in the cylinder to the left and right in response to the applied alternating voltage, Wherein the suction and discharge of the fluid are alternately performed through the suction pipe and the discharge pipe connected to the left and right working spaces according to the left / right movement of the piston. The reciprocating electric pump according to claim 1, wherein the solenoid is constituted by a drive coil wound at a predetermined distance along the longitudinal direction in the middle of the cylinder. 2. The reciprocating electric pump according to claim 1, wherein the piston is constituted by a plurality of divided magnets having a rod shape as a whole. The reciprocating electric pump according to claim 3, wherein the piston has a longitudinal hollow portion at the center thereof.