JP2007263001A - Linear actuator for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear actuator for a pump device preventing pulsation by reciprocating a piston of the pump device by drive force of the motor which can rotate in a regular and a reverse direction without using compressed air, hydraulic pressure or the like and reducing vibration generated on piping of the device or the like. <P>SOLUTION: The actuator is provided with the motor 2 which can rotate in the regular and the reverse direction, a drive means 3 reciprocating a piston pump 30. a transmission means 4 transmitting rotary force of the motor 2 to the drive means 3, and a control means controlling regular and reverse rotation of the motor 2. The drive means 3 is provided with a cylinder case 5, a rotary cylinder part 6, a screw shaft 7, a guide groove part 8, and guide part 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump linear actuator applicable to a pump device.

Conventionally, various pump apparatuses such as an ink supply pump apparatus that supplies commercial printing ink, newspaper ink, and the like are known (see, for example, Patent Document 1).
"Printing ink supply system" (YAMADA CATALOG), publisher: Yamada Corporation, published August 1999, revised October 2001

  A pump device such as the ink supply pump device described in the above-mentioned document 1 is driven by compressed air, hydraulic pressure, or the like. However, when the pump device is driven by compressed air, hydraulic pressure, etc., there is a sudden increase in the discharge pressure and discharge amount when switching the vertical direction in the reciprocating operation of the piston of the pump. Pulsation occurs and large vibrations occur in the piping of the device.

  The present invention has been made in view of the above-described problems of the prior art, and does not use compressed air or hydraulic pressure, and reciprocates the piston of the pump device by the driving force of a motor that can rotate forward and backward. Accordingly, it is an object of the present invention to provide a linear actuator for a pump that can prevent the occurrence of the pulsation as described above and reduce vibrations generated in the piping of the apparatus.

The present invention is a pump linear actuator provided in a pump having a reciprocating piston, a motor capable of rotating forward and reverse, a driving means for reciprocating the piston of the pump, and a rotational force of the motor. A transmission means for transmitting to the drive means; and a control means for controlling forward / reverse rotation of the motor. The drive means is provided in a cylinder case and a spiral groove on an inner wall rotatably provided in the cylinder case. A rotating cylinder part formed with a screw, a screwed shaft connected to the piston of the pump screwed into the helical groove of the rotating cylinder part, and the cylinder case along the axial direction of the screwed shaft A guide groove portion having at least two guide grooves formed therein, and a guide portion connected to the screw-attached shaft and guided by the guide groove portion. To provide a linear actuator pump, characterized in that comprises a.

  The transmission means includes a motor pulley attached to a rotating shaft of the motor, a shaft pulley attached to the rotating cylinder, a belt wound around the motor pulley and the shaft pulley. Can be configured. Further, the transmission means includes a motor sprocket attached to the rotating shaft of the motor, a shaft sprocket attached to the rotating cylinder portion, and a chain wound around the motor sprocket and the shaft sprocket. can do.

  Further, the guide part may be formed so that the cross section is formed in a cross shape, while the guide groove part has four guide grooves so as to guide the guide part.

  Furthermore, the motor and the driving means can be provided on the same plate, and the axis of the rotation axis of the motor and the axis of the screwed shaft of the driving means can be made parallel.

  According to the present invention, it is possible to prevent the occurrence of pulsation by causing the piston of the pump device to reciprocate by the driving force of a motor that can rotate forward and backward without using compressed air, hydraulic pressure, etc. It is possible to reduce the vibration generated in the pipes.

  The best mode for carrying out the pump linear actuator according to the present invention will be described below with reference to the drawings. 1A shows a side view of the pump linear actuator, FIG. 1B shows a cross-sectional view of the pump linear actuator, and FIG. 1C shows an upper surface of the pump linear actuator. The figure is shown. As shown in FIG. 1, the pump linear actuator 1 according to the present invention is provided in a piston pump 30 that reciprocates, and is used to operate the piston pump 30 by reciprocating. The pump linear actuator 1 can be applied to all reciprocating pumps such as piston pumps. For convenience of explanation, the piston pump 30 is a general ordinary piston pump, and detailed description thereof is omitted.

  The pump linear actuator 1 includes a motor 2 that can rotate forward and backward, a drive unit 3 that reciprocates the piston pump 30, a transmission unit 4 that transmits the rotational force of the motor 2 to the drive unit 3, and a forward / reverse direction of the motor 2. Control means for controlling the rotation. The motor 2 can be rotated in forward and reverse directions by a control means described later.

  The drive means 3 is mainly composed of a cylinder case 5, a rotating cylinder portion 6, a screwed shaft 7, a guide groove portion 8, and a guide portion 9, and will be described in more detail below. The cylinder case 5 is formed in a substantially cylindrical shape with a central portion passing therethrough. At the lower part in the cylinder case 5, a rotating cylinder portion 6 is provided so as to be rotatable with respect to the cylinder case 5 by a bearing 10. As for this rotary cylinder part 6, the spiral groove is formed in the inner wall in the inner wall.

  The lower end portion of the screwed shaft 7 is connected to the upper end portion of the piston pump 30, and the piston pump 30 is reciprocated by the reciprocating motion of the screwed shaft 7 (vertical motion in FIG. 1A). Then run. The screw-attached shaft 7 has a screw formed on the outer periphery, and the screw is supported by the rotating cylinder portion 6 by being screwed into a spiral groove of the rotating cylinder portion 6.

  As well shown in FIGS. 2 and 4, a guide groove portion 8 having a guide groove 11 is formed in the upper portion of the cylinder case 5. The guide groove 8 has at least two guide grooves 11 formed in the cylinder case 5 along the axial direction of the shaft 7 with screw. The illustrated guide groove 8 has four guide grooves 11 formed at equal intervals. The guide groove portion 8 guides the guide portion 9 connected to the upper end portion of the screw-attached shaft 7 along the guide groove 11 of the guide groove portion 8 in the axial direction of the screw-attached shaft 7. The illustrated guide part 9 is formed in a cross shape in cross section, and the guide part 9 is guided only in the axial direction of the screwed shaft 7 by the guide groove part 8 having four guide grooves 11.

  The transmission means 4 is wound around the motor pulley 20 attached to the rotating shaft of the motor 2, the shaft pulley 21 attached integrally to the rotating cylinder portion 6, the motor pulley 20 and the shaft pulley 21. The belt 22 is mainly constituted. Accordingly, the rotational force (driving force) of the motor 2 is transmitted to the rotary cylinder portion 6 through the transmission means 4. The illustrated belt 22 is an open belt having the same pulley rotation direction, but is not limited thereto, and may be a cross belt in which the pulley rotation directions are opposite to each other. Further, the transmission means 4 can be a motor sprocket instead of the motor pulley, a shaft sprocket instead of the shaft pulley, or a belt wound around both sprockets.

  The control means is for controlling forward / reverse rotation of the motor 2, and well-known control means can be used. In FIG. 1, the cylinder case 5 is provided with switches S1 and S2 spaced apart in the axial direction of the shaft 7 with screw (arranged at the stroke interval of the pump piston), and the switches S1 and S2 detect the guide 9. By doing so, the forward / reverse rotation of the motor 2 is controlled.

  The motor 2 and the driving means 3 are provided on the same plate 25, and the axis of the rotation axis of the motor 2 and the axis of the screwed shaft 7 of the driving means 3 are parallel to each other. .

  Next, the operation of the above embodiment will be described. When the motor 2 rotates, the rotating cylinder portion 6 rotates via the motor pulley 20, the shaft pulley 21 and the belt 22. Due to the rotation of the rotating cylinder portion 6 and the restriction by the guide groove 11 of the guide groove portion 8 of the guide portion 9, the screwed shaft 7 moves in the axial direction. Further, the rotation of the motor 2 is reversed by the control of the switches S1 and S2, and the screwed shaft 7 moves in the reverse direction. By repeating this, the piston pump 30 can reciprocate.

FIG. 1A is a side view showing an embodiment of a linear actuator for a pump according to the present invention, FIG. 1B is a sectional view, and FIG. 1C is a top view. FIG. 2 is a perspective view showing the above embodiment. FIG. 3 is another perspective view showing the above embodiment. 4A and 4B show a guide groove portion and a guide portion applicable to the above-described embodiment. FIG. 4A is a sectional view and FIG. 4B is a plan view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear actuator for pumps 2 Motor 3 Drive means 4 Transmission means 5 Cylinder case 6 Rotating cylinder part 7 Screwed shaft 8 Guide groove part 9 Guide part 10 Bearing 11 Guide groove 20 Motor pulley or motor sprocket 21 Shaft pulley or shaft Sprocket 22 Belt or chain 30 Piston pump

Claims (5)

A linear actuator for a pump provided in a pump having a reciprocating piston,
A motor that can rotate forward and reverse,
Drive means for reciprocating the piston of the pump;
Transmission means for transmitting the rotational force of the motor to the drive means;
Control means for controlling forward and reverse rotation of the motor,
The driving means includes
A cylinder case,
A rotating cylinder part provided with a spiral groove on the inner wall, provided rotatably in the cylinder case;
A screwed shaft connected to the piston of the pump, screwed into the helical groove of the rotating cylinder portion;
A guide groove having at least two guide grooves formed in the cylinder case along the axial direction of the screw shaft;
A linear actuator for a pump, comprising: a guide portion connected to the shaft with screw and guided by the guide groove portion. The transmission means includes
A motor pulley attached to the rotating shaft of the motor;
A pulley for the shaft attached to the rotating cylinder part;
The linear actuator for a pump according to claim 1, comprising a belt wound around the pulley for the motor and the pulley for the shaft. The transmission means includes
A motor sprocket attached to the rotating shaft of the motor;
A sprocket for a shaft attached to the rotating cylinder part;
The linear actuator for a pump according to claim 1, comprising a chain wound around the sprocket for the motor and the sprocket for the shaft.   4. The guide portion according to claim 1, wherein the guide portion has a cross-shaped cross section, and the guide groove portion has four guide grooves so as to guide the guide portion. 5. The linear actuator for pumps as described in one.   5. The motor and the driving means are provided on the same plate, and the axis of the rotation shaft of the motor and the axis of the screwed shaft of the driving means are parallel to each other. The linear actuator for pumps as described in any one of these.

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