JP2009185799A - Stabilization of tube of tube pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem such as deforming, extending and bending, when a tube is pulled in the rotating direction, by a point of time of a ring-shaped pressurizing member. <P>SOLUTION: A tube isolating member rotating in cooperation with an eccentric rotor, is inserted between the ring-shaped pressurizing member and the tube, and a phenomenon of sticking the tube to the ring-shaped pressurizing member is prevented, and the tube isolating member contacts with the tube, and rotates in the inverse direction of the rotating direction, and pushes back the tube in the inverse direction. Alternatively, a tube return member rotating in cooperation with the eccentric rotor is pushed against the tube crushed in a flat shape, and the tube is returned in a circular shape, and the phenomenon of sticking the tube to the ring-shaped pressurizing member is prevented, and an energizing means of pushing back the tube in the inverse direction by the tube return member is constituted as a part of the eccentric rotor, and the purpose is inexpensively attained without separately constituting a tube pulling preventive member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention is a tube that compresses a tube arranged in a ring shape along the inner peripheral surface of a cylindrical chamber in one direction by a ring-shaped pressurizing member that is arranged on the inner side and moves eccentrically, thereby performing a pumping action. Regarding pumps.

  With this type of tube pump, the rotational direction of the eccentric rotor corresponds to the radial difference between the outer peripheral surface of the ring-shaped pressurizing member and the inner peripheral surface of the cylindrical chamber as the ring-shaped pressurizing member moves eccentrically. Rotation in the opposite direction (this rotation is referred to as “rotation” in this application) occurs in the ring-shaped pressure member, and a force that pulls the tube in the rotation direction is generated at the tube compression portion by the ring-shaped pressure member. However, the tube is wound around the ring-shaped pressure member. For this reason, the tube is further pulled in the rotation direction, the tube cross section becomes flat, and the cross sectional area decreases. Therefore, in the tube pump, the liquid flow rate decreases, the tube extends, and the tube is bent in the vicinity of the inlet to the cylindrical chamber of the tube, thereby inhibiting the liquid flow rate. In addition, the phenomenon of winding of the tube around the ring-shaped pressure member increases the motor load, and bending of the tube causes tube damage and shortens the pump life.

In order to reduce the pulling force due to the above phenomenon and improve the damage to the tube due to friction with the cylindrical chamber or the ring-shaped pressure member, it is common to apply a lubricant such as grease to the tube and its surroundings. Has been done. In order to preserve the effect of this lubricant over a long period of time, a grease reservoir is provided in the ring-shaped pressure member, and the lubricant can be supplied from the grease reservoir of the ring-shaped pressure member to the outer peripheral surface of the ring-shaped pressure member. It has been proposed, and a mechanical rotation stop mechanism is provided to restrict the rotation of the ring-shaped pressure member (see Patent Document 1). In addition, a holding means for the tube is provided so that the tube does not move (see Patent Document 2).
JP 11-13648 JP 2006-29161 A

  This invention pays attention to these points, and in order to eliminate the phenomenon that the tube is pulled in the rotation direction, the tube and the ring-shaped pressurizing member are separated, and the tube is pushed back in the direction opposite to the rotation direction. The purpose is to hold it stably.

  In order to achieve the above object, in the tube pump of the present invention, the tube is caught in the ring-shaped pressurizing member in order to counteract the tube pull caused by the rotation of the ring-shaped pressurizing member that occurs with the eccentric motion. And an urging means for pushing back the tube in the reverse direction. Since this urging means can be configured integrally with the eccentric rotor, it is possible to provide a technology that can be mass-produced at low cost.

  The above urging means inserts a tube separating member that rotates in cooperation with the eccentric rotor between the ring-shaped pressure member and the tube, prevents the tube from sticking to the ring-shaped pressure member, and the tube The separation member is configured to push the tube back in the reverse direction by contacting the tube and rotating in the direction opposite to the rotation direction.

  Alternatively, the tube return member that rotates in cooperation with the eccentric rotor is pressed against the flatly crushed tube, the tube is returned to a circular shape, and the phenomenon that the tube sticks to the ring-shaped pressure member is prevented. Further, by configuring the biasing means for the tube return member to push the tube in the reverse direction as a part of the eccentric rotor, it is not necessary to separately configure the tube pulling prevention member, and the object can be achieved at low cost.

  In this invention, it is necessary to separately configure the tube pulling prevention member by configuring the tube isolation member that prevents the tube from sticking to the ring-shaped pressure member and pushes the tube in the reverse direction as a part of the eccentric rotor. There is no, and the purpose is achieved at low cost.

  1 to 3 show a first embodiment, FIG. 1 is a schematic sectional view of the main part, FIG. 2 is a schematic front view of the main part showing the arrangement of main members, and FIG. 3 is an explanatory view of the principle of operation. It is. In the figure, 1 is a pump housing composed of a body case 1a having a cylindrical chamber 2 formed therein and a lid 1b, 3 is a tube arranged in a ring shape along the inner peripheral surface of the cylindrical chamber 2, The lead-out portions 3 a at both ends are drawn out of the pump housing 1 from the opening formed in the pump housing 1 or are fixed to the pump housing 1 in the vicinity of the opening. 4 is a ring-shaped pressurizing member disposed inside the tube 3, 5 is an eccentric rotor disposed inside the ring-shaped pressurizing member 4, and the eccentric rotor 5 is fixed to the motor shaft 7. Reference numeral 6 denotes a tube separating member provided adjacent to the tube 3 to the eccentric rotor 5, and the tube 3 and the tube separating member 6 are in direct contact with each other or through an inclusion. The tube isolation member 6 is configured as an integral or separate member with the eccentric rotor 5. The tube isolation member 6 and the eccentric rotor 5 are supported by the pump housing 1 so that the rotation center thereof is rotatable. ing.

  In the tube pump of this embodiment, when the pump driving motor is driven, the eccentric rotor 5 rotates, the ring-shaped pressurizing member 4 moves eccentrically, and the tube 3 is sequentially pressed in one direction to perform the pump action. . Since the basic operation of such a pump is not replaced by a well-known tube pump, detailed description is omitted.

  The operation of the urging means will be described with reference to FIG. Now, when the tube separating member 6 that rotates in conjunction with the eccentric rotor rotates clockwise and the ring-shaped pressurizing member 4 moves eccentrically, the ring-shaped pressurizing member 4 moves along with the eccentric movement. A counterclockwise rotational force acts (spins) as indicated by a broken arrow arrow in accordance with the radius difference from the inner peripheral surface of the cylindrical chamber 2, and if no measures are taken, the ring-shaped pressure member 4 rotates to rotate the tube. 3 will be pulled counterclockwise little by little. If a force that pushes the tube back in a clockwise direction is applied to the force that pulls the tube 3 counterclockwise, the tube can be prevented from moving.

  The present invention pays attention to this point, and the tube separating member 6 is inserted between the tube 3 and the ring-shaped pressurizing member 4 and separates the tube attached to the ring-shaped pressurizing member. Further, since the tube separating member 6 that rotates in the clockwise direction is in contact with the tube directly or via an inclusion, a force that pushes back the tube in the clockwise direction in accordance with the frictional force between the tube separating member 6 and the tube 3. Is generated. At this time, the pulling force to the tube 3 in the counterclockwise direction generated by the rotation acting on the ring-shaped pressurizing member 4 and the pushing back force to the tube 3 in the clockwise direction by the tube separating member 6 work. The position of can be stabilized.

5 and 6 show a schematic cross-sectional view and a schematic front view of the main part of the embodiment of the second aspect. Except for the tube return member 8 of the first aspect, FIG. 5 and FIG.
5 and 6, the tube return member 8 is forced to press the tube 3 flattened by the ring-shaped pressurizing member 4 against the bottom surface of the cylindrical chamber, so that the tube 3 is restored to have a circular cross section. The friction between the tube 3 and the ring-shaped pressurizing member 4 is reduced more than when the tube 3 has a flat cross section, and the tube 3 is watched by the friction caused by pressing the tube return member 8 against the tube 3. Pushed back in the direction, the tube position can be stabilized. In addition, by restoring the cross section of the tube 3 to a circular shape, the cross sectional area of the tube 3 is increased as compared with a flat shape, and a decrease in the liquid flow rate can be prevented. The tube isolation member 6 and the tube return member 8 may be provided integrally.

  The present invention can be applied to various tube pumps.

It is a schematic sectional drawing of the principal part of the Example of Claim 1 of this invention. It is a schematic front view of the principal part of the Example. It is explanatory drawing of the operation principle of the Example. It is a schematic sectional drawing of the principal part of the Example of Claim 1 of this invention. It is a schematic front view of the principal part of the Example. It is a schematic front view of a prior art example. It is a schematic sectional drawing of the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump housing 2 Cylindrical chamber 3 Tube 4 Ring-shaped pressurization member 5 Eccentric rotor 6 Tube isolation member 7 Rotating shaft 8 Tube return member 11 Pump drive motor

Claims (2)

A tube is arranged in a ring shape along the inner peripheral surface of the cylindrical chamber formed in the housing body, and a ring-shaped pressurizing member provided inside the tube is deflected along the inner peripheral surface by an eccentric rotor. In the tube pump that sends the fluid in the tube by sequentially pressing the ring-shaped member of the tube in one direction by moving the core,
A tube pump, wherein a tube isolation member that rotates in cooperation with an eccentric rotor is inserted between a ring-shaped pressurizing member and a tube.   A tube pump comprising: a tube return member that rotates in cooperation with an eccentric rotor, and is configured to press the tube against the bottom surface of the cylindrical chamber.

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