JP2510917Y2 - Roller pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a roller pump that is used for medical treatment, physics and chemistry, etc., and rotates a tube while crushing it with a roller to transfer the liquid in the tube. is there.

[Prior Art] As shown in FIG. 4, a conventional roller pump has a shaft 27 protruding into a circular storage recess 26 in a housing 25.
A rotor 28 is connected to the. An arm 30 is rotatably supported by the rotor 28 via a pair of connecting protrusions 29,
A roller 31 is rotatably supported at its tip by a pin 32. Further, the rotor 28 is provided with a spring 33 for urging the arm 30, so that the tube 35 provided in the notch recess 34 is surely pressed to transfer the liquid in the tube 35.

However, when the roller 31 is rotated by the rotation of the rotor 28, the tube 35 is pressed and closed in the semi-periphery of the storage recess 26 (the range indicated by X in FIG. 4), but the tube is not pressed (non-pressed portion). In a range indicated by Z in FIG. 4, the arm 30 is urged by the urging force of the spring 33.
There is a problem that the roller 31 rotates and the roller 31 comes into contact with the non-pressing portion to generate a sound.

As shown in FIG. 5, as a countermeasure against this, a stopper 37 having an O-ring 36 serving as a cushioning material is inserted from the outside of the arm 30 into the connecting projection 29 and is screwed into the connecting projection 29. It is fixed by tightening with a set screw 38. As a result, when the roller 31 is positioned at the non-pressing portion where the tube 35 is no longer pressed, the arm 30 is rotated by the bias of the spring 33 to try to bring the roller 31 into contact with the non-pressing portion.
The rotation of the arm 30 is restricted by 37 to prevent the generation of sound.

[Problems to be solved by the invention] However, not only the structure of providing the stopper 37 for restricting the rotation of the arm 30 is complicated, but also the adjustment for restricting the rotation of the arm 30 is delicate and the adjustment is difficult. Is troublesome.
Further, if the setscrew 38 is loosened due to long-term use, the roller 31 comes into contact with the non-pressing portion and a noise is generated.
In addition, when the set screw 38 is loosened and the stopper 37 is disengaged from the connecting projection 29, the stopper 37 causes the rotor 28 to not rotate normally, which makes it impossible to transfer the liquid normally. Furthermore, for medical use, this sound may cause discomfort or anxiety to the patient and may adversely affect the mental state. Further, if the tube 35 is displaced in the storage recess 26, the roller 31 cannot reliably press the tube 35, and the liquid in the tube 35 may not be transferred.

An object of the present invention is to provide a roller pump capable of preventing the generation of noise by the roller, eliminating the need for complicated adjustment work, and reliably transferring the liquid in the tube.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the invention of the present application rotates a roller in a housing recess of a housing by a motor, and disposes the roller along the moving path of the roller. In the roller pump that presses the formed tube and transfers the liquid in the tube, the gist is that a soft elastic member is provided on the inner peripheral surface of the storage recess where the roller separates from and abuts against the tube.

[Operation] With the above configuration, when the roller is separated from the tube, the roller comes into contact with the soft elastic member on the inner peripheral surface of the storage recess.

〔Example〕

An embodiment in which the present invention is embodied in a blood circulation roller pump will be described below with reference to FIGS. 1 and 2.

As shown in FIGS. 1 (a) to 2, the roller pump 1
The housing 2 is formed in a rectangular parallelepiped shape, and a notched concave portion 3 having a U-shaped plane is formed on the upper surface thereof. A circular storage recess 4 is formed on one side surface of the cutout recess 3. A shaft 5 connected to a motor (not shown) is projected at a substantially center of the storage recess 4.

A flat rectangular rotor 6 is fixed to the shaft 5. Connecting protrusions 7a, 7b each having a quadrangular shape in a plan view are provided on the upper side surface of one side and the lower side surface of the other side of the rotor 6, respectively. Swing arms 8a and 8b are rotatably connected to the connecting protrusions 7a and 7b by arm shafts 9a and 9b.

Rollers 11a and 11b are rotatably supported on the tips of the swing arms 8a and 8b by roller shafts 10a and 10b. Also,
As shown in FIG. 1 (b), a pair of guide pieces 12a, 12b protruding orthogonally on both sides in the lateral width direction of the swing arms 8a, 8b.
Is provided.

A storage hole 13a is formed on one side surface of the rotor 6 on the lower side.
And a storage hole 13b is formed in the other side surface of the upper side of the rotor 6. A spring 1 for biasing the tip ends of the swing arms 8a, 8b into the storage holes 13a, 13b, respectively.
4a and 14b are stored respectively.

Further, as shown in FIG. 1 (c), guide pieces 15a and 15b are provided on both upper and lower surfaces of the rotor 6 in the width direction.

A soft elastic member 17 is attached to the semi-inner peripheral surface (inner peripheral surface opposite to the X range shown in FIG. 1) of the accommodation recess 4. The both ends of the elastic member 17 are formed with slanting taper portions 18, respectively, so that the rollers 11a and 11b can easily ride on the elastic portion 17.

When the tube 19 is arranged along the inner peripheral surface of the cutout recess 3 of the housing 2 and the rollers 11a and 11b are mainly located within the range of X shown in FIG.
The liquid in the tube 19 is transferred by pressing 19.

Further, in this embodiment, the rotor 6 and the rollers 11a,
11b rotates counterclockwise and guides the swing arms 8a and 8b.
The tubes 19 are guided along the movement paths of the rollers 11a, 11b by the 12a, 12b, so that the tubes 19 are surely fixed.
It is designed to be pressed by b.

Further, the guide pieces 15a and 15b guide the tube 19 when the rotor 6 and the rollers 11a and 11b rotate in opposite directions.

Reference numeral 20 denotes a pair of support members provided in the cutout recess 3 of the housing 2 so as to support the tube 19.

The operation of the blood circulation roller pump configured as described above will be described. The pair of swing arms 8a, 8b,
Since the pair of rollers 11a and 11b have the same function, only the function of the swing arm 8a and the roller 11a will be described.

First, the power source is turned on to drive a motor (not shown) to rotate the shaft 5. Then, the rotor 6 and the roller 11
a and 11b rotate synchronously. Then, when one roller 11a is positioned within the range of X, the tip of the swing arm 8a moves to the rotor 6a.
Is urged by the spring 14a stored in the roller 1
1a presses the tube 19 to close it. Also swing arm
The tube 19 is guided by the pair of guide pieces 12a, 12b provided on the 8a to prevent the tube 19 from coming off the storage recess 4, and is reliably pressed by the roller 11a.
Therefore, when the roller 11a rotates in this state, the tube 1
Blood in 9 is transferred.

When the roller 11a is separated from the tube 19 and positioned in the Z range, the swing arm 8a is rotated about the arm shaft 9a in the direction away from the rotor 6 by the urging force of the spring 14a. Therefore, the roller 11a presses the elastic member 17 attached inside the storage recess 4. Therefore, unlike the past. When the roller 11a rotates the storage recess 4 within the Z range, the elastic force of the elastic member 17 can prevent the generation of sound.

Further, since the stopper 37 for restricting the swing arms 8a and 8b is unnecessary, not only the number of parts can be reduced, but also the adverse effect of the stopper 37 can be avoided.

Further, since the guide pieces 12a, 12b can guide the tube 19 on the moving path of the rollers 11a, 11b to prevent the positional deviation, the blood in the tube 19 can be reliably pressed and transferred by the rollers 11a, 11b. .

Further, when the rotor 6 and the rollers 11a and 11b rotate in the reverse direction, the tube 19 is guided by the guide pieces 15a and 15b, so that the tube 19 can be pressed by the rollers 11a and 11b in a stable state.

Further, since the tapered portions 18 are provided at both ends of the elastic member 17, the impact when the rollers 11a and 11b run on the elastic member 17 can be absorbed, and the rotation of the rollers 11a and 11b can be stabilized.

Further, in this embodiment, the elastic member 17 is attached to the semi-inner peripheral surface of the storage recess 4, but the entire portion shown by hatching in FIG. 3 can be made of the elastic member 17 made of urethane rubber or the like. is there.

The present invention is not limited to the above-mentioned embodiment, and can be arbitrarily modified within a range not departing from the gist of the present invention.

[Advantages of the Invention] As described in detail above, according to the present invention, the roller is provided with a very simple structure in which a soft elastic member is provided on the inner peripheral surface of the storage recess where the roller separates from the tube and abuts. There is an effect that it is possible to prevent the generation of a sound that occurs when the roller abuts on the inner peripheral surface and rotates, and it becomes unnecessary to make adjustment so that the roller does not abut the storage recess.

[Brief description of drawings]

1A is a plan view showing the structure of a roller pump according to the present invention, FIG. 1B is a perspective view showing the structure of a swing arm, and FIG. 1C is a perspective view showing a rotor. FIG. 2 is a perspective view showing the shape of the housing, FIG. 3 is a plan view showing another example of the elastic member, FIG. 4 is a plan view showing a conventional roller pump, and FIG. 5 is a restriction member. It is a top view which shows the prior art example of a roller pump. 2 ... Housing, 4 ... Storage recess, 8a, 8b ... Swing arm, 11a, 11b ... Roller, 12a, 12b ... Guide piece, 17 ...
... an elastic member.

Claims (1)

(57) [Scope of utility model registration request] 1. A roller pump for rotating a roller in a housing recess of a housing by a motor and pressing a tube arranged along the moving path of the roller in the housing to transfer the liquid in the tube. A roller pump characterized in that a soft elastic member is provided on the inner peripheral surface of the housing recess where the roller separates from the tube and abuts against the tube.