KR20070061170A - Pump using electromagnetic actuators - Google Patents

Abstract

A pump using electromagnetic actuators is provided to obtain a longer driving distance, a high energy density, and a high responding speed with a relatively less voltage. A pump using electromagnetic actuators includes an upper end coil unit(2), a lower end coil unit(3), and a central driving unit(1). The upper end coil unit includes a coil on which electricity flows, and forms a magnetic field according to a direction of a flow of electricity. The lower end coil unit includes a coil on which the electricity flows, and forms the magnetic field according to the flow of the electricity corresponding to the flow of the electricity of the upper end coil unit. The central driving unit is placed between the upper end coil unit and the lower end coil unit, and has one or more than one pump chamber including a permanent magnet. The permanent magnet transports a fluid by reciprocating inside the pump chamber through conversion of a direction of the magnetic field by the upper coil unit and the lower coil unit.

Description

Pump using electromagnetic actuators

1 schematically shows the structure of a pump according to the invention.

Figure 2 schematically shows the structure around the central drive of the pump.

3 and 4 are views for explaining the driving principle of the pump according to the present invention.

5 shows an example of the structure of the upper coil portion and the lower coil portion according to the present invention.

The present invention relates to the field of using electromagnetic, and relates to a pump using an electromagnetic actuator.

There are many types of pumps, but nowadays, there is a need for highly efficient miniature mini pumps suitable for small biomedical and medical devices such as insulin pumps and lab-on-a-chips.

Conventional micro pump technology can be largely divided into three.

The first is a non-mechanical pump using osmotic pressure or electrophoresis, the second is a diaphragm pump using two check valves or diffusers, and a diaphragm.

The diaphragm pump has a diaphragm connected to the actuator in the central pump room and generally two check valves are connected before and after the central pump room. When the diaphragm moves forward, the front and rear valves open, and when the diaphragm moves backwards, both the front and back valves close, allowing fluid to be transported in only one direction.

The disadvantage of the micro diaphragm valve is that the structure of the check valve is so complicated that it is difficult to fit in the narrow space of the micro pump and it is very difficult to manufacture. Recently, the nozzle and diffuser is used to select the structure to replace the check valve, but the structure is complicated, but still less stable.

Since the small pumps are used in medical or biological devices, it is necessary to simplify the structure in order to consume minimal power, that is, energy, and to reduce the risk of failure, but there is a problem in that the small pump that meets all of them is not provided yet.

SUMMARY OF THE INVENTION In order to solve the above problems, a technical object of the present invention is to provide a pump using an electromagnetic actuator that can be used in a mini pump for fluid transportation, which has a simple structure and a small size and low energy consumption.

According to the present invention for solving the above technical problem, the pump using an electromagnetic actuator, including the coil through which electricity flows the upper coil portion to form a magnetic field according to the direction of the electrical flow; A lower coil part including a coil through which electricity flows, and forming a magnetic field according to the electric flow corresponding to the electric flow of the upper coil part; And one or more pump chambers positioned between the upper coil portion and the lower coil portion, and including one or more permanent magnets, wherein the permanent magnets change direction and direction of a magnetic field by the upper coil portion and the lower coil portion. It characterized by comprising; a central drive unit for transporting the fluid by repeating the reciprocating motion in the pump chamber.

At this time, the central drive unit, the first pump chamber, the second pump chamber and the third pump chamber of the form of a cylinder; A connection channel connecting between the first pump chamber and the second pump chamber and between the second pump chamber and the third pump chamber; A first permanent magnet, a second permanent magnet, and a third permanent magnet located in the first pump chamber, the second pump chamber, and the third pump chamber, respectively; And a polymer diaphragm that seals and encapsulates the permanent magnets, and functions as an on / off valve and a driving diaphragm of each pump chamber, wherein the upper coil part is configured to form a magnetic field by flowing electricity on top of each of the permanent magnets. A coil for generating a driving force in each permanent magnet, and the lower coil part includes a coil for generating a driving force in each of the permanent magnets by forming a magnetic field by flowing electricity at a lower end of each of the permanent magnets. It is preferable to use the electromagnetic force generated by the interaction between the magnetic field generated by the flowing current and the respective permanent magnets as the driving force of the actuator.

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

Figure 1 schematically shows the structure of a pump according to the present invention, Figure 2 schematically shows the structure around the central drive of the pump.

The electromagnetic actuator pump according to the present invention is composed of a central drive unit 1, an upper coil unit 2, and a lower coil unit 3. As also shown in FIG. 1, the central drive unit 1 is located between the respective coil units.

As shown in FIG. 2, the central drive unit 1 includes a first pump chamber 21, a second pump chamber 22, a third pump chamber 23, and a connection channel (not shown) connecting the respective pump chambers and respective pump chambers. The first, second and third permanent magnets (11, 12, 13) acting as a driving center in the flexible polymer membrane (41, 42) surrounding each permanent magnet and acting as an opening valve and driving diaphragm of each pump chamber Consists of

The upper coil part 2 and the lower coil part 3 flow two or more lines to form a magnetic field to generate two or more linear upper and lower coils 31 to 3 to generate driving force in the first to third permanent magnets 11, 12, and 13. 38).

The first pump chamber 21 is connected to a discharge port for discharging the fluid transferred from the second pump chamber 22 out of the pump while acting as a cylinder for the first permanent magnet 11 to move. When no current flows through the coils 31 to 38, the polymer diaphragms 41 and 42 are in a state of blocking the discharge ports.

Like the first pump chamber 21, the third pump chamber 23 is connected to an inlet or inlet for receiving fluid from the outside into the pump while acting as a cylinder for the third permanent magnet 13 to move. In the third pump chamber 23, the polymer diaphragm 41, 42 is blocking the inlet when no current flows through the coils 31 to 38. FIG.

In the second pump chamber 22, the second permanent magnet 12 moves, and the polymer diaphragms 41 and 42 increase and decrease the volume of the cylinder space to act as a transport pressure to the fluid.

Although not shown in the figure, the first pump chamber 21 and the second pump chamber 22 and between the second pump chamber 22 and the third pump chamber 23 are connected by a fluid transfer channel.

In addition, although not shown in FIGS. 1 and 2, the inclined protrusions may be formed on the upper portions of the polymer diaphragms of the first and second pump chambers 21 and 22 so that the injection hole and the discharge hole may be more reliably opened.

3 and 4 are views for explaining the driving principle of the pump according to the present invention. The operating principle of the pump according to the present invention is as follows.

As shown in FIG. 3, only the coil portion through which the electric current flows in the same direction with the center line of the permanent magnets 11, 12, and 13 interposed therebetween and passes over the permanent magnet and is parallel to the upper and lower surfaces of the three permanent magnets. When a current flows in one of the linear coils 31 and 32 in the direction of the arrow, a magnetic field is formed in the upward direction as shown in FIG.

When the permanent magnets are placed in the magnetic field thus formed so that the north poles face upwards, as shown in the second and third permanent magnets 12 and 13 of FIG. 3, the repulsive force acts between the coil and the permanent magnet. The third permanent magnets 12 and 13 go down.

However, as shown in the first permanent magnet 11 of FIG. 3, when the N poles face downward, the pulling force acts on the first permanent magnet 11 to rise upward. In this case, as the third permanent magnet 13 of the third pump chamber 23 descends, the polymer diaphragm descends to open the inlet.

Similarly, in the second pump chamber 22, the second permanent magnet 12 and the polymer diaphragm are lowered to increase the volume of the cylinder to suck the fluid from the outside. However, at this time, since the third permanent magnet 23 of the third pump chamber 23 receives upward force, the polymer diaphragm does not move, and thus the discharge port is more tightly blocked.

In this way, the first pump chamber 21 and the third pump chamber 23 serve as the check valve, and the fluid enters the second pump chamber 22 through the inlet from the outside, and the fluid does not enter or exit the outlet.

When the current of the coil flows in a direction opposite to that of FIG. 3 as shown in FIG. 4, the magnetic field is formed in a direction opposite to the magnetic field formed in FIG. 3 so that the second and third permanent magnets 12 and 13 rise upwards and the first permanent state. The magnet 11 goes down. In this case, the polymer diaphragm of the third pump chamber 23 blocks the injection port, and the polymer diaphragm of the second pump chamber 22 moves in a direction of decreasing the volume of the cylinder, and the polymer diaphragm of the third pump chamber 23 moves downward. Move to open the discharge port.

In this case, the fluid entering the pump is under pressure to exit the pump, but the inlet is blocked and only the outlet is opened, so that the liquid is discharged out of the pump through the outlet.

That is, the driving force is generated by the interaction between the magnetic field generated by the current flowing through the coil and the magnetic field of the permanent magnet, and the fluid is transported by the interlocking motion of the electromagnetic actuators of the three pump chambers.

Repeating the two processes described above maintains a one-way flow of transport fluid entering the pump through the inlet and exiting the pump through the outlet. Therefore, one-way pumping can be performed by simple switching operation that properly arranges the coils 31 to 38 and redirects the current flowing through the coils 31 to 38, and changes the fluid transfer speed of the pump by changing the current switching switching speed. Can be adjusted.

As a result, the mini-pump according to the present invention can maintain the one-way pump operation with only a simple up and down movement of the actuator of the central pump room like a diaphragm pump without having a complicated structure such as a check valve. In addition, unlike the peristaltic pump, which requires three pump chambers to be driven independently, only a simple up and down movement by a permanent magnet in the central pump chamber is required. Therefore, a complicated driving circuit is not required, and the diaphragms of the first and second pump chambers 21 and 22 are used. They act as active check valves, making it easy to eliminate the possibility of backflow.

In addition, there is no need to operate three or more pump chamber actuators independently, as in a general peristaltic pump, so there is no need for complicated driving circuits and only a simple switching circuit. The minipump according to the present invention prevents the inlet and the outlet through the elastic force of the polymer diaphragm only when no current flows, and induces the drive of the pump diaphragm and the opening / closing of the valve only when the fluid is transported. It is not consumed, so the power consumption can be very low. To be applied as a biomedical pump, it is necessary to minimize not only the size of the pump body itself but also a driving circuit and a power supply device for driving the pump.

Compared with the conventional pump as described above, the pump according to the present invention has the advantage of miniaturizing the driving circuit and the power supply by greatly simplifying the driving operation and minimizing the power consumption.

In addition, the mini-pump according to the present invention has a simple three-cylinder type pump chamber and only four terminals exposed to the pump outer wall are simply operated by connecting to an external power source.

In order to drive the electromagnetic actuator according to the present invention, only the coil portion through which the electric current flows in the same direction with the center line of the permanent magnets interposed therebetween is passed over the permanent magnets, and the three permanent magnets are parallel to the upper and lower surfaces of the three permanent magnets. You need a straight, multiple coil that passes all over the magnet. Although the plurality of linear coils are a pair of linear coils with proper spacing with the center lines of the permanent magnets 11 to 13 as shown in FIGS. 3 and 4, a magnetic field required for actuator operation can be obtained, but a driving force is generated by a simple switching operation. In order to maximize the strength of the magnetic field acting on the permanent magnet while maintaining the principle, the upper coil portion and the lower coil portion of the structure as shown in FIG.

If possible, increase the number of strands of the linear coil in which current flows in the same direction, and a large magnetic field can be obtained. However, increasing the number of terminals connected to the outside of the device in order to increase the number of strands of the linear coil is not good because it is not only complicated to manufacture but also increases the risk of disconnection during use.

Therefore, as shown in FIG. 5, the number of terminals connected to the power supply is limited to four on each of the upper and lower plates, and four magnetic coils having a square swirl shape are installed on the upper and lower surfaces of the coil substrate to maximize magnetic field strength.

In the form of square vortex coil, only the coil part in which current flows in one direction is placed on the permanent magnet, and the part in which the current flows in the opposite direction is installed so as to deviate from the permanent magnet. The gap between the pair of square vortex coils installed on the top and bottom surfaces is adjusted to maximize the strength of the magnetic field generated in the center of the permanent magnet.

When the upper and lower coils are connected to each other through the through holes 61 and 62 as shown in FIG. 5 and the coil vortex directions of the upper and lower surfaces are reversed, the same current direction can be maintained without a separate connection terminal.

As a result, as described above, the pump according to the present invention is a pump of a combination type of a diaphragm pump and a peristaltic pump.

The peristaltic pump uses the peristaltic principle of the digestive tract and is a pump that transfers fluid in one direction by peristaltic operation of three or more pump chambers connected in series. The peristaltic pump has an advantage of being able to be easily manufactured with an uncomplicated structure, but there is a possibility of backflow due to the small transport pressure and a small amount of transport. In addition, in order to operate the three pump chambers interlocked, a complicated driving circuit for moving the actuator is required, so that the size of the drive controller is larger than the pump itself.

However, as described above, the pump according to the present invention combines the advantages of a diaphragm pump and a peristaltic pump, and is a pump that is simple in structure and easy to manufacture, and can smoothly transport fluid by ON / OFF operation of a central pump room.

In addition, all diaphragm and peristaltic pumps require actuators, except non-mechanical pumps. The pump is classified according to the operating principle of the actuator. The classification according to the actuator can be divided into various driving methods such as piezoelectric method, electrostatic force method, ion exchange polymer-metal composite method, thermopneumatic method and electromagnetic force method.

The present invention obtains the driving force of the actuator using the interaction of the magnetic field generated by the electricity flowing through the permanent magnet and the winding in the manner using the electromagnetic force. The piezoelectric and electrostatic forces require high voltages to drive, which makes them unsuitable for medical applications, the thermostatic method consumes a lot of power, and the ion-exchange polymer-metal composite method has not been proven to be durable. On the other hand, the electromagnetic actuator has a large driving distance by a relatively small voltage, has a high energy density, and has an advantage of having a relatively fast response speed.

Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. Examples included in the above description are introduced for the understanding of the present invention, and these examples do not limit the spirit and scope of the present invention. For example, in the above description, the Internet is mainly used as an example of a communication network, but it is also possible to use a public telephone communication network such as a PSTN, and in addition to the above examples, various embodiments according to the present invention are possible. It will be obvious to those who have a normal knowledge of the technical field to which they belong. The scope of the present invention is shown not in the above description but in the claims, and all differences within the scope will be construed as being included in the present invention.

In addition, it can be easily understood by those skilled in the art that each of the above steps according to the present invention can be variously implemented in software or hardware using a general programming technique.

According to the present invention, the upper coil portion including a coil through which electricity flows to form a magnetic field according to the direction of the electric flow, and includes a coil through which electricity flows, and forms a magnetic field according to the electrical flow corresponding to the electrical flow of the upper coil portion. Located between the lower coil portion and the upper coil portion and the lower coil portion, and comprises one or more pump chambers containing permanent magnets, the permanent magnets of the direction and direction of the magnetic field by the upper coil portion and the lower coil portion It is possible to implement a simple and compact structure, including a central drive unit for transporting the fluid by repeating the reciprocating motion in the pump chamber by the switching, energy is not required other than the energy for the current flowing through the coil It can be used in mini pumps for low consumption fluid transport, resulting in a relatively small voltage. It can have a driven distance obtain a high energy density, and provides a technical basis for creating a micro-pump having a relatively short response time.

Claims (9)

An upper coil part including a coil through which electricity flows to form a magnetic field according to a direction of the electric flow; A lower coil part including a coil through which electricity flows, and forming a magnetic field according to the electric flow corresponding to the electric flow of the upper coil part; And Located between the upper coil portion and the lower coil portion, and comprises one or more pump chambers containing permanent magnets, the permanent magnets in the direction and direction of the magnetic field change by the upper coil portion and the lower coil portion The central drive unit for transporting the fluid by repeating the reciprocating motion in the pump chamber by a pump using an electromagnetic actuator comprising a. The method of claim 1, The central drive unit, A first pump chamber, a second pump chamber, and a third pump chamber in the form of a cylinder; A connection channel connecting between the first pump chamber and the second pump chamber and between the second pump chamber and the third pump chamber; A first permanent magnet, a second permanent magnet, and a third permanent magnet located in the first pump chamber, the second pump chamber, and the third pump chamber, respectively; And A polymer diaphragm that seals and wraps the permanent magnets and functions as an on / off valve and a driving diaphragm of each pump chamber. The upper coil unit includes a coil for generating a driving force in each of the permanent magnets by forming a magnetic field by flowing electricity to the upper end of each of the permanent magnets, The lower coil part includes a coil that generates electricity by flowing electricity at the lower ends of the permanent magnets to generate a driving force in each of the permanent magnets, and between the magnetic field generated by the current flowing through the respective coils and the permanent magnets. A pump using an electromagnetic actuator, characterized in that the electromagnetic force generated by the interaction is used as the driving force of the actuator. The method of claim 2, The polymer diaphragm is a pump using an electromagnetic actuator, characterized in that one or more concentric bones are formed to increase the displacement of the actuator. The method of claim 2, The polymer diaphragm is a pump using an electromagnetic actuator, characterized in that serves as a fluid outlet valve and a fluid inlet valve. The method according to claim 2 or 4, And the polymer diaphragm of the third pump chamber operates as an inlet valve of the fluid, and the polymer diaphragm of the first pump chamber operates as an outlet valve of the fluid. The method of claim 5, When no current flows through the coils included in the coil parts, and the driving force is not applied to each of the permanent magnets, the polymer diaphragm of the first pump chamber and the third pump chamber is in a state of blocking the discharge port and the injection port. Pump using. The method of claim 6, The polymer diaphragm of the first pump chamber and the third pump chamber has a conical protrusion to block the discharge port and the injection port. The method according to claim 1 or 2, The coil included in the upper coil portion or the lower coil portion is formed in a rectangular swirl shape so that the coil portion flowing in one direction passes through the lower portion of the upper or lower surface of the upper surface of each of the permanent magnets, and the coil portion of the current flowing in the other direction. The pump using the electromagnetic actuator, characterized in that positioned to deviate from the top or bottom of each of the permanent magnets. The method according to claim 1 or 2, The upper coil portion includes a pair of linear coils, and the lower coil portion also includes a pair of straight coils, the four linear coils are electrically connected to each other, characterized in that the pump using an electromagnetic actuator.

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