KR101512300B1 - Piston pump for non-pulsation - Google Patents

Abstract

The present invention relates to a piston pump without pulsation. The piston pump includes: a power driving part that comprises a first motor, which generates rotation power, and a second motor, which rotates while having a phase difference of 180° with respect to the first motor; a first piston part which receives rotation power, generated by the first motor, and discharges a certain amount of fluid, supplied through a first fluid supply pipe, through a first fluid discharge pipe; a second piston part which receives rotation power, generated by the second motor, and discharges a certain amount of fluid, supplied through a second fluid supply pipe, through a second fluid discharge pipe; a fluid transfer pipe that has an end portion, connected to the first fluid discharge pipe and the second fluid discharge pipe, and transfers the fluid, discharged through the fist fluid discharge pipe and the second fluid discharge pipe; a first rotation sensor that is installed on a rotation axis of the first motor, senses a rotation angle of the rotation axis, and generates a first rotation signal; a second rotation sensor that is installed on a rotation axis of the second motor, senses a rotation angle of the rotation axis, and generates a second rotation signal; a communication part that receives the first signal and the second signal, which are generated by the first rotation sensor and the second rotation sensor, and sends the first signal and the second signal to a signal control part; and the signal control part that checks an error of phase difference by comparing the first signal and the second signal.

Description

PISTON PUMP FOR NON-PULSATION [0002]

[0001] The present invention relates to a pulsating piston pump, and more particularly, to a pulsating piston pump which performs fine-coating such as a stent coater by precisely controlling the flow rate by a piston which performs rotation and reciprocating motion so as to discharge a small amount of fluid, The present invention relates to a pulsating piston pump capable of preventing a pulsation phenomenon.

Generally, stents are used for the treatment of coronary arteries. When blood or body fluid does not flow smoothly in a blood vessel, a gastrointestinal tract, or a biliary tract due to a malignant or benign disease, the stent does not perform surgical operation, It is a cylindrical medical material used to normalize the flow of blood or body fluids by inserting it into a blocked area.

Such a stent is coated on part or all of the stent such that a predetermined amount of fluid such as a coating liquid exists on the surface of the stent. Therefore, in the case of fine coating such as stent coating, the coating thickness must be made constant and precise, so that the discharged fluid needs to be precisely controlled.

As a technique capable of keeping the amount of discharged fluid constant, Japanese Patent Laid-Open No. 10-2005-0087440 discloses a technique relating to a double-tube tubing pump. That is, the double tube tubing pump rotates the rotor equipped with the roller, and a certain amount of fluid can be discharged by moving the roller in contact with the portion contacting the roller in the rotating direction.

However, in this conventional technique, there is a problem that as the friction between the roller and the tube increases, that is, when the service life is prolonged, the tension of the tube decreases, and the discharge amount of the fluid decreases.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a precision flow rate control device capable of precisely controlling the amount of fluid by using a pair of pistons which are alternately rotated and linearly reciprocating so as to discharge a small amount of fluid. And to provide a pulsating piston pump which can be controlled.

In addition, the present invention can control the rotational angular velocity and stroke of each piston interlocked with a pair of motors having a rotation angle difference of 180 degrees, thereby minimizing the ripple phenomenon that may occur during fluid discharge, And to provide a pulsating piston pump capable of precise flow control.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a pulsating piston pump according to an embodiment of the present invention includes a first motor for generating rotational power and a second motor for rotating the first motor with a phase difference of 180 degrees, A first piston unit that receives a rotational power generated by the first motor and discharges the fluid supplied through the first fluid supply pipe to a first fluid discharge pipe having a fixed capacity; A second piston connected to the first fluid discharge pipe and the second fluid discharge pipe for discharging the fluid supplied through the second fluid supply pipe to a fixed volume second fluid discharge pipe, A fluid delivery tube mounted on a rotating shaft of the first motor for sensing a rotation angle of the rotating shaft, A second rotation recognition sensor mounted on a rotation axis of the second motor for sensing a rotation angle of the rotation axis to generate a second rotation signal; And a second rotation recognizing sensor for receiving the first and second rotation signals, respectively, and transmitting the first and second rotation signals to the signal controller, and comparing the first rotation signal and the second rotation signal to each other, Wherein the signal control unit generates an operation control signal and transmits the operation control signal to the power driving unit through the communication unit when it is determined that there is a phase error, and the power driving unit controls the first motor and the second motor based on the transmitted operation control signal, And the rotation speed of the second motor is controlled.

Further, the pulse-free piston pump according to the present invention is characterized in that the signal control unit confirms that there is a phase error when the difference in rotation angle between the rotation axis of the first motor and the rotation axis of the second motor exceeds 180 degrees.

The pulleyless piston pump according to the present invention may further include a first motor control module for controlling the rotational speed of the first motor and a second motor control module for controlling the rotational speed of the second motor Wherein the first motor control module accelerates the rotation speed of the first motor in a predetermined interval when the fluid is discharged through the first piston portion and adjusts the rotation speed of the first motor The second motor control module accelerates the rotation speed of the second motor in a predetermined interval when the fluid is introduced through the second piston portion and rotates the rotation of the second motor at a predetermined interval when the fluid is discharged, And the speed is decelerated.

In addition, the pulleyless piston pump according to the present invention is characterized in that the communication unit performs Bluetooth wireless communication with the signal control unit.

According to the piston pump of the present invention, there is an advantage that the amount of fluid can be controlled and discharged according to the linear reciprocating motion section of the piston by using the piston that rotates and linearly reciprocates in the receiving section with respect to the fluid to be introduced.

According to the present invention, there is an advantage that a certain amount of fluid can be discharged by minimizing the ripple phenomenon that may occur when the fluid is discharged by providing a pair of piston portions that alternately perform the fluid inflow and discharge processes.

1 is a perspective view schematically showing a pulsating piston pump capable of precise flow control according to the present invention.
FIG. 2 and FIG. 3 illustrate a rotation recognition sensor mounted on a motor provided in a pulsating piston pump according to the present invention.
4 is a diagram exemplarily showing the rotation signals measured by the first motor and the second motor included in the pulse-free piston pump according to the present invention.
5 is a perspective view showing a piston and a cylinder constituting a piston portion of a pulsating piston pump according to the present invention.
6 is a cross-sectional view showing a piston portion of a pulsating piston pump according to the present invention.
7 is a sectional view showing a guide portion provided in the piston portion of Fig.
Figs. 8 to 11 are diagrams showing examples of the operation of the pulse-free piston pump according to the present invention. Fig.
FIG. 12 is a diagram exemplarily showing a change in flow rate in accordance with acceleration and deceleration of a first motor and a second motor provided in a pulsating piston pump according to the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Embodiments in accordance with the concepts of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It is to be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms of disclosure, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ",or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

FIG. 1 is a perspective view schematically showing a pulsating piston pump capable of precise flow control according to the present invention, and FIGS. 2 and 3 are views illustrating a rotation recognition sensor mounted on a motor provided in a pulsating piston pump .

Referring to the drawings, a pulsating piston pump according to the present invention includes a power driving unit 10 including a first motor 110 and a second motor 120 for generating rotational power, a main body 1 having a communication unit 30 And a first piston portion 20 and a second piston portion 20 'as a pair of piston portions mounted on the main body 1. [

One end of the first fluid supply pipe 40 is connected to one end of the first piston unit 20 and the other end of the first fluid supply pipe 40 is connected to the other end of the first fluid discharge pipe 50. The fluid supplied through the first fluid supply pipe 40 can be discharged to the first fluid discharge pipe 50 at a predetermined capacity by the rotational power generated by the power drive unit 10 in the first piston unit 20.

Also, the second fluid supply pipe 40 'and the second fluid discharge pipe 50' are connected to one side and the other side of the second piston part 20 ', respectively, so that the supplied fluid can be discharged to a certain capacity. Particularly, in the present invention, since the fluid discharged through the first piston portion 20 and the fluid discharged through the second piston portion 20 'are configured to have a phase difference of 180 °, the first piston portion 20 and the second piston portion 20' The two piston portions 20 'can alternately discharge the fluid.

In this case, although not shown in detail, the first piston portion 20 and the second piston portion 20 'are provided so as to minimize the ripple phenomenon with respect to the fluid discharged through the first piston portion 20 and the second piston portion 20' 'May be configured to be inclined at a certain angle.

In addition, the first piston 20 and the second piston 20 'alternately perform the inflow and outflow of fluids and control the RPM and stroke crossing of the piston mounted on each piston, So that the pulsation phenomenon that may occur when the fluid is discharged can be minimized.

The discharge pipe coupling portion 60 can be connected to the first fluid discharge pipe 50 and the second fluid discharge pipe 50 ', and the fluid delivery pipe 70. Accordingly, the fluid discharged from each of the fluid discharge pipes 50 and 50 'can be transferred through the discharge pipe coupling part 60 through one fluid delivery pipe 70.

The power driving unit 10 may include a first motor 110 generating rotational power and a second motor 120 rotating with a phase difference of 180 degrees with the first motor 110. [

2 and 3, the first motor 110 and the second motor 120 are mounted on the rotating shafts 113 and 123 of the motors 110 and 120 and rotate the rotating shafts 113 and 123 For example, a fan-shaped rotation recognition sensor 112, 122 of 180 degrees.

The rotation recognition sensors 112 and 122 can generate a rotation signal at the start point and the end point as shown in Fig.

For example, when the first rotation recognition sensor 112 passes the start point, the first motor 110 generates a signal "1 ", and when the first rotation recognition sensor 112 passes the end point, And generates a signal "0 ". At this time, in the first motor 110, the rotation axis 113 may be positioned at 0 ° when the signal is "1", and 180 ° when the signal is "0".

On the other hand, in the case of the signal "1", the rotation axis 123 is positioned at 180 ° and the signal "0" in the second motor 120 rotating with a phase difference of 180 ° from the first motor 110 360 [deg.], I.e., 0 [deg.].

Therefore, when the two motors 110 and 120 are operated simultaneously, the signals "1" and "0" of the two motors 110 and 120 must be displayed exactly in a zigzag manner. However, As can be seen, a phase error may occur in the A section.

The first rotation recognition sensor 112 and the second rotation recognition sensor 122 provided in the pulsating piston pump of the present invention generate a first rotation signal and a second rotation signal, respectively, And the communication unit 30 transmits the signal to the signal controller 80. At this time, the communication unit 30 may use wireless communication with the signal control unit 80, for example, a Bluetooth communication method, and may use a wired or other communication method if necessary.

Specifically, if the signal "1" and "0" of the two motors 110 and 120 are not identical, the signal control unit 80 confirms that there is a phase error, And transmits the generated operation control signal to the power drive unit 10 through the communication unit 30. [

The operation control signal transmitted to the power drive unit 10 includes a first motor control module 111 for controlling the rotation speed of the first motor 110 and a second motor control module 111 for controlling the rotation speed of the second motor 120. [ The speed of the first motor 110 and the speed of the second motor 120 are controlled by the motor control modules 111 and 121 so that the two motors 110 , 120) can be matched.

FIG. 5 is a perspective view showing a piston and a cylinder constituting a pulsating piston pump according to the present invention, FIG. 6 is a sectional view showing a piston part of a pulsating piston pump according to the present invention, and FIG. 7 is a cross- Fig.

Referring to the drawings, the piston units 20 and 20 'may include a cylindrical body 210 and a piston 220 made of a ceramic material and inserted into the body 210.

The body portion 210 is formed with an opening at an upper end thereof, and a storage portion 211 having an inner diameter in the longitudinal direction is formed therein.

A fluid inlet hole 212 is formed at one side of the body 210 and connected to the fluid supply pipes 40 and 40 'to receive fluid from the fluid storage unit 211. Fluid discharge pipes 50 and 50' And a fluid discharge hole 213 for discharging the fluid supplied through the fluid inlet hole 212 is formed.

The piston 220 may be formed in a cylindrical shape so as to be rotatable in the housing part 211 and slidable upward and downward along the longitudinal direction of the housing part 211. The outer diameter of the piston 220 is smaller than the outer diameter of the body part 210 That is, the outer diameter of the accommodating portion 211, as shown in FIG.

Although not shown, a pressure ring member capable of closely contacting the outer circumferential surface of the piston 220 and the inner circumferential surface of the accommodating portion 211 can be mounted.

A fluid inflow surface 230 formed in a planar recessed shape is formed on the lower outer circumferential surface of the piston 220 and a power transmitting member 240 provided on the upper side for transmitting the rotation power of the power driving unit 10 to the piston 200 . The power transmitting member 240 may be connected to the power driving unit 10 via a rotating shaft and rotated by a rotational power generated by the power driving unit 10, though not shown in detail.

The power transmitting member 240 may be equipped with a fin 250 mounted in a direction perpendicular to the longitudinal direction of the piston 220. 7 (a), the power transmitting member 240 may be coupled to the guide portion 260 mounted on the upper side of the body portion 210. As shown in FIG. On the inner circumferential surface of the guide portion 260, a wave-shaped guide groove 261 is formed as shown in Fig. 7 (b).

In particular, one end of the fin portion 250 mounted on the power transmitting member 240 can be slidably coupled to the guide groove 261. The pin portion 250 mounted on the power transmitting member 240 is slid along the guide groove 261 by the rotation of the power transmitting member 240 and the pin portion 250 mounted on the power transmitting member 240 Is moved along the guide groove 261 so that the piston 220 coupled with the power transmitting member 240 performs a reciprocating motion in the up and down direction simultaneously with the rotational movement in the receiving portion 211.

Particularly, when the piston 220 is in the raised state, that is, the highest point in the housing portion 211, the fluid inflow surface 230 is positioned to face the fluid inflow hole 211, The fluid inlet surface 230 may be positioned to face the fluid outlet hole 212 when it abuts the bottom surface.

Figs. 8 to 11 are diagrams showing examples of the operation of the pulse-free piston pump according to the present invention. Fig.

8 (a), when the piston 220 of the first piston portion 20 is lifted up in the housing portion 211, the fluid inlet surface 230 contacts the fluid inlet hole 211, The fluid can be supplied into the accommodating portion 211 through the recessed fluid inlet surface 230 and the amount of fluid supplied can be controlled according to the position at which the piston 220 is lifted.

At this time, as shown in FIG. 8 (b), the second piston portion 20 'may be in a state in which the fluid in the storage portion 211' is being discharged through the second fluid discharge pipe 50 '. That is, the piston 220 'is in the lowered state, and the fluid is discharged from the accommodating portion 211' through the fluid discharge hole 213 'through the space of the fluid inlet surface 230' formed by the depression.

9 (a), when the fluid is supplied into the housing portion 211 of the first piston portion 20, the fluid inlet surface 230 is closed by the rotation of the piston 220, 211 to the position of the fluid discharge hole 212. At this time, the fluid inlet hole 212 can be blocked by the outer circumferential surface of the piston 220. 9 (b), the fluid inlet surface 230 'is rotated from the fluid outlet hole 212' to the fluid inlet hole 211 'by the rotation of the piston 220' mounted on the second piston portion 20 ''.

10 (a), the position of the fluid inlet surface 230 of the first piston portion 20 moves to the position facing the fluid discharge hole 212, and at the same time, The piston 220 is moved downward by the first piston 250 to discharge the fluid contained in the storage portion 211 to the fluid discharge hole 212 and the second piston portion 20 ' The fluid is supplied through the space between the fluid inlet surface 230 'and the accommodating portion 211'.

11 (a) and 11 (b), when the fluid is supplied into the storage portion 211 'of the second piston portion 20' The fluid inlet hole 212 'is blocked by the outer circumferential surface of the piston 220', and at the same time, the fluid inlet hole 212 'is moved to the position of the fluid outlet hole 212' The fluid inlet surface 230 is moved from the fluid discharge hole 212 to the fluid inlet hole 211 side by the rotation of the piston 220 mounted on the first piston portion 20.

In the piston pump of the present invention, the first piston portion and the second piston portion can alternately perform the inflow and outflow of the fluid. By controlling the lifted position of the piston mounted on each piston portion, can do.

When the two motors 110 and 120 are rotationally driven at the same speed, the flow rates discharged through the first piston portion 20 and the second piston portion 20 'may respectively appear as sine waves. In this case, Pulsation can be detected.

Accordingly, in the pulsating piston pump of the present invention, the first motor control module 111 accelerates the rotation speed of the first motor 110 in a predetermined interval when the fluid is discharged through the first piston portion 20, The second motor control module 121 decelerates the rotational speed of the first motor 110 at a predetermined interval when the fluid flows into the first piston portion 20 while the second motor control module 121 decelerates the rotational speed of the second piston portion 20 ' The rotational speed of the second motor 120 is accelerated in a predetermined interval when the fluid flows into the first motor 110, that is, in a period where the phase difference between the first motor 110 and the first motor 110 is 180 degrees, It is possible to control the rotation speed of the motor 120 to be reduced.

As shown in FIG. 12A, the rotational speeds of the two motors 110 and 120 are accelerated and decelerated, respectively, so that the change amount of the flow rate discharged through the first piston portion 20 and the second piston portion 20 ' This reduction, that is, the increase and decrease of the flow rate is canceled out to each other, so that the pulsation phenomenon can be remarkably reduced.

In addition, a separate flow rate sensor (not shown) may be installed in the fluid delivery pipe 70 to sense the amount of fluid discharged through the fluid delivery pipe 70, And a display unit 90 connected to the signal control unit 80 through the display unit 90. [

Although not shown, the display unit 90 includes an information input module capable of inputting information or a touch panel capable of directly inputting information into the display unit 90. The display unit 90 can set the amount of fluid to be discharged to a value desired by a user have.

When the setting information related to the control of the flow rate is input through the display unit 90 as described above, the signal control unit 80 provides the setting information to the power drive unit 10 through the communication unit 30, The module 111 and the second motor control module 121 vary the rotational speeds of the first and second motors 110 and 120 so that the first and second pistons 20 and 20 ' The amount of the discharged fluid can be changed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: Body
2: Signal control section
10:
20: first piston part 20 ': second piston part
30:
40: first fluid supply pipe 40 ': second fluid supply pipe
50: first fluid outlet pipe 50 ': second fluid outlet pipe
60: exhaust pipe coupling portion 70: fluid delivery pipe
110: first motor 111: first motor control module
112: first rotation recognition sensor
120: second motor 121: second motor control module
122: second rotation recognition sensor
210, 210 ': body portion 211, 211': accommodating portion
212, 212 ': Fluid inlet holes 213, 213': Fluid outlet holes
220, 220 ': piston 230, 230': fluid inlet surface
240, 240 ': power transmitting member 250, 250': pin
260, 260 ': guide portion 261, 261': guide groove

Claims (8)

A first motor for generating rotational power; and a second motor for rotating the first motor with a phase difference of 180 degrees with respect to the first motor;
A first piston unit that receives the rotational power generated by the first motor and discharges the fluid supplied through the first fluid supply pipe to a first fluid discharge pipe of a predetermined capacity;
A second piston unit that receives the rotational power generated by the second motor and discharges the fluid supplied through the second fluid supply pipe to a fixed capacity second fluid discharge pipe;
A fluid delivery pipe connected to the first fluid discharge pipe and the second fluid discharge pipe to move the fluid discharged through the first fluid discharge pipe and the second fluid discharge pipe;
A first rotation recognition sensor mounted on a rotation axis of the first motor for sensing a rotation angle of the rotation axis to generate a first rotation signal;
A second rotation recognition sensor mounted on a rotation axis of the second motor for sensing a rotation angle of the rotation axis to generate a second rotation signal;
A communication unit for receiving the first and second rotation signals respectively generated by the first rotation recognition sensor and the second rotation recognition sensor and transmitting the first and second rotation signals to the signal control unit; And
And a signal controller for comparing the first rotation signal and the second rotation signal to check whether there is a phase error,
Wherein the signal control unit generates an operation control signal and transmits the operation control signal to the power drive unit through the communication unit when it is determined that there is a phase error, and the power drive unit rotates the first and second motors Speed control,
The power-
A first motor control module for controlling a rotation speed of the first motor; And
And a second motor control module for controlling the rotational speed of the second motor,
The first motor control module accelerates the rotation speed of the first motor at a predetermined interval when the fluid is discharged through the first piston portion and decelerates the rotation speed of the first motor at a predetermined interval when the fluid is introduced At the same time, the second motor control module accelerates the rotation speed of the second motor in a predetermined interval when the fluid is introduced through the second piston, and adjusts the rotation speed of the second motor And the speed of the pulsating pump is reduced.
The method according to claim 1,
Wherein the signal control unit confirms that there is a phase error when the difference in rotation angle between the rotation axis of the first motor and the rotation axis of the second motor is out of 180 degrees.
delete The method according to claim 1,
Wherein the communication unit performs Bluetooth wireless communication with the signal control unit.
The method according to claim 1,
Wherein the first piston portion and the second piston portion are formed in a cylindrical shape,
A cylindrical body portion having an opening at an upper end thereof and having a receiving portion formed in the longitudinal direction thereof;
A fluid inlet hole formed at one side of the body portion and connected to the fluid supply pipe;
A fluid discharge hole formed on the other side surface of the body portion and connected to the fluid discharge pipe;
A cylindrical piston which is rotatable in the storage portion and slidably coupled along the storage portion;
A fluid inflow surface formed in a plane with the lower outer peripheral surface of the piston;
A power transmitting member mounted on the upper side of the piston and receiving the rotational power of the power driving unit to provide the rotational power to the piston;
A pin mounted on the power transmitting member in a direction perpendicular to the longitudinal direction of the piston and protruding in one direction; And
And a piston guide portion mounted on the upper portion of the body portion and having a wave-shaped guide groove formed on an inner circumferential surface thereof so that the pin portion is engaged with the piston portion.
6. The method of claim 5,
Wherein the piston reciprocates up and down by a pin that moves along the guide groove simultaneously with the rotational movement by the rotational power provided by the power supply unit.
The method according to claim 6,
Wherein the fluid inflow surface is positioned to face the fluid inflow hole when the piston is lifted in the accommodating portion and the fluid inflow surface is positioned so as to face the fluid discharge hole in the lowered state, Pump.
6. The method of claim 5,
The body and the piston are made of ceramic material,
Wherein the outer diameter of the piston is the same as the outer diameter of the receiving portion.

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