JP3461791B2 - Tube pump - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a single-phase induction motor.
It is driven by so as to rotate only in a predetermined direction
Tube pump .

[0002]

2. Description of the Related Art As is well known, a single-phase induction motor has a relatively simple structure and a low product price. However, the rotation direction at start-up is not constant in principle, so that it rotates in a predetermined direction. As described above, it is necessary to provide an electrical measure such as providing a shading coil or using a starting capacitor, and a mechanical measure such as using a deceleration gear that rotates only in a fixed direction. Therefore, for driving the tube pump
Even if a low-priced single-phase induction motor is used, the cost of the final product including the motor and the entire system will increase,
There is also a problem that the control circuit and the mechanical mechanism become complicated.

[0003]

THE INVENTION Problems to be Solved] The present invention focuses on such problems, so as to rotate only in a predetermined direction by providing a mechanical control mechanism having a simple structure, single-phase
A low-priced tube pump that uses an induction motor as a drive
It was made as an issue to provide a group.

[0004]

In order to solve the above-mentioned problems, according to the present invention , an eccentric ring-shaped pressure member.
The tube between the outer member and the outer member that has a circular inner circumference.
Tube and press the tube in the longitudinal direction one by one with the pressure member.
Is configured to deliver the fluid in the tube,
For tube pumps equipped with a single-phase induction motor for driving
At the rotary shaft side driven by the single-phase induction motor
A member and a protrusion provided on either one of the fixed side members,
The rotary shaft is provided with a concave portion provided on the other side corresponding to the protruding piece.
Is allowed to rotate in one predetermined direction, and in the other direction
At the time of rotation, the protruding piece engages with the concave portion to prevent rotation, and
A machine configured to apply a repulsive force in a fixed direction to the rotating shaft
A mechanical control mechanism is provided.

With such a configuration, when the electric motor is started in a predetermined rotation direction when the power is turned on, the electric motor can continue to rotate, and when it is started in the reverse direction, the mechanical control mechanism prevents the rotation. At the same time, the rotary shaft momentarily rotates in the predetermined direction by the repulsive force in the predetermined direction, and this triggers the rotation in the predetermined direction this time. Therefore, just add a simple mechanism
It is possible to regulate the rotation direction of the tube pump to the desired direction, and it is easy to reduce the price of the entire pump
Becomes

[0006]

[0007]

The mechanical control mechanism is such that a protrusion having a spring property is formed on the outer circumference of the eccentric drive member in a direction opposite to the predetermined rotation direction, and a tip of the protrusion abuts on the inner circumference of the pressing member. It can be relatively easily configured with the locking recess formed in. In this case, the oil-impregnated material impregnated with the lubricating oil can be arranged on the inner peripheral side of the protrusion, and the protrusion deforms to push the oil-impregnated material, whereby the lubricating oil is supplied to the periphery. The above-mentioned projecting piece can be replaced with a spring piece attached to the eccentric drive body so as to project in the same direction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described . FIG. 1 is a schematic front view of the entire pump, but since the general structure itself of a tube pump is well known, it will be briefly described.

In FIG. 1, reference numeral 1 denotes an outer member that forms a cylindrical chamber 2. An inner peripheral surface 2a of the cylindrical chamber 2 is circular and is formed in a range larger than a semicircle and smaller than the entire circumference. Two
The portion where a is not formed is the opening 2b.
Reference numeral 3 denotes a tube, which is arranged along the inner peripheral surface 2a of the cylindrical chamber 2 in a ring shape, and both ends thereof are drawn out of the outer member 1 to form an inflow port 3a and an outflow port 3b. The outer member 1 is made of rubber-based material such as NBR or ABS.
Composed of synthetic resin molded products such as. As the tube 3, a tube made of rubber or various synthetic resins is appropriately selected and used according to the fluid to be transferred, and an elastic material is generally used, but a material having no elasticity may be used in some cases.

Reference numeral 4 denotes a ring-shaped pressure member arranged inside the tube 3, which has a double structure of an inner ring 41 and an outer ring 42, and the inner ring 41 is a rigid material having a small friction coefficient. For example, the outer ring 42 is formed of a fluorine resin-based synthetic resin molded product, and the outer ring 42 is formed of an elastic material having a large friction coefficient such as rubber.

Reference numeral 5 is an eccentric drive member arranged inside the pressing member 4, and 6 is a rotary shaft to which the eccentric drive member 5 is attached. The eccentric drive body 5 rotates while making the circular outer peripheral surface 5a slidably contact the inner peripheral surface 4a of the pressing member 4, thereby causing the pressing member 4 to make a circular motion along the inner peripheral surface 2a, and the pressing member 4 The tube 3 between the outer peripheral surface 4b and the inner peripheral surface 2a side of the cylindrical chamber 2 is configured to be sequentially pressed toward the outlet 3b. Reference numeral 7 denotes a single-phase induction motor arranged on the back side of the outer member 1, and its rotating shaft serves as the rotating shaft 6 as it is or is connected to the rotating shaft 6 via an appropriate speed reducer.

A projecting piece 8a is formed on the outer peripheral surface 5a of the eccentric drive body 5, and a locking recess 8b is formed on the inner peripheral surface 4a of the inner ring 41 of the pressing member 4 correspondingly. The mechanical control mechanism 8 in the present invention is configured. In the case of FIG. 1, the predetermined rotation direction of the rotary shaft 6 is clockwise as shown by the arrow, the projecting piece 8a is provided so as to project counterclockwise, and an external force is applied as shown in FIG. The tip 8c is formed in such a shape that, when it is not present, the tip 8c extends slightly outside the circular outer peripheral surface 5a. Further, as described above, since the eccentric drive body 5 is a synthetic resin molded product, the projecting piece 8a has a certain degree of spring property. Corresponding to this, the locking concave portion 8b formed in the pressing member 4 has a protruding piece 8b as shown in FIG.
It is formed in a shape having a step surface 8d with which the tip 8c of a abuts.

Reference numeral 5b is a connecting hole into which the rotary shaft 6 is inserted, and 5c is a key groove for engaging a key (not shown) provided on the rotary shaft 6, whereby the eccentric drive body 5 is integrated with the rotary shaft 6. Rotate. The inner ring 41 has a rotation stopper pin 4
1a is provided in a protruding manner and is loosely inserted into a large engagement hole (not shown) provided in the outer member 1 to stop the rotation movement of the pressure member 4. Reference numeral 11 denotes a tube pump having the above-mentioned configuration.

The mechanical control mechanism 8 has such a structure. When the single-phase induction motor 7 is driven and the rotary shaft 6 starts rotating clockwise, which is a predetermined direction, for example, the outer peripheral surface of the eccentric drive body 5 is rotated. 5a rotates while slidingly contacting the inner peripheral surface 4a of the pressing member 4. In this case, since the projecting piece 8a passes through the engaging recess 8b without any trouble, the eccentric drive body 5 rotates as it is, and the pressurizing member 4 circularly moves to perform a pumping action.

On the other hand, when the rotating shaft 6 starts to rotate counterclockwise, when the eccentric drive member 5 rotates and the projecting piece 8a reaches the position of the locking recess 8b, the step surface of the locking recess 8b. The tip 8c of the protruding piece 8a abuts on 8d. However, the pressure member 4
Is a state in which a part of the tube 3 is pressurized, and a certain amount of force is required to rotate it, so it does not rotate immediately even if the tip 8c hits it, but eccentric drive at the moment it hits it in reverse. The rotation of the body 5 is stopped, and a repulsive force in the clockwise direction is applied to the projecting piece 8a by the impact. Therefore, the eccentric drive unit 5
Is momentarily rotated slightly clockwise, and this rotation is also transmitted from the rotary shaft 6 to the rotor of the electric motor 7. The rotation direction of the rotor causes the rotary shaft 6 to rotate clockwise. After that, the eccentric drive body 5 is rotated clockwise as in the above case.

While the eccentric drive body 5 is rotating, a small click sound is generated each time the projecting piece 8a comes to the engaging recess 8b. Further, since the eccentric drive body 5 rotates while sliding in contact with the pressure member 4, it is necessary to keep the sliding surface always lubricated. Figure 4 is an example that considers these points.
An oil-containing material 9 is arranged on the inner peripheral side of the projecting piece 8a. Oil-containing material 9
Acts as an oil sump, and for example, a felt or sponge impregnated with lubricating oil is used. Each time the protrusion 8a of the eccentric drive member 5 comes to the position of the locking recess 8b, the protrusion 8a comes out slightly outside the outer peripheral surface 5a, and the pressing member 4 again.
Since the operation of being pressed by the inner peripheral surface 4a is repeated, the oil-containing material 9 is pushed each time and the lubricating oil is supplied to the periphery. Therefore, the above-mentioned click noise is reduced and the sliding surface is automatically lubricated, so that a tube pump with a low operating noise and a long life can be obtained.

FIG. 5 shows an example in which a spring piece 8e is attached instead of the projecting piece 8a integrally formed with the eccentric drive body 5, and the spring piece 8e is composed of, for example, a vinyl chloride plate having a thickness of 0.3 mm. . In FIG. 5A, only the spring piece 8e is provided,
In (b), the oil-impregnated material 9 is arranged on the inner peripheral side of the spring piece 8e, and the operation itself is the same as in the case where the above-mentioned protruding piece 8a is provided.

The mechanical control mechanism 8 of the present invention has a function similar to that of a one-way clutch, but it not only allows rotation in a predetermined direction, but reverses the direction in the opposite direction. It is different from a normal clutch in that it has a function of causing it. The illustrated embodiment is an example of a tube pump that is driven by a single-phase induction motor, and a mechanical control mechanism is provided between the eccentric drive body 5 and the pressurizing member 4, which are essential members for the tube pump. 8 is provided, it is not necessary to use a separate member for the mechanical control mechanism 8. Therefore, since the structure does not become complicated and a low-priced single-phase induction motor can be used, a DC power supply unlike the case of using a DC motor is not necessary, and an inexpensive tube pump can be obtained.

[0020]

[0021]

As is apparent from the above description, the tube pump of the present invention is driven by a single-phase induction motor.
To the rotating shaft side or fixed side member.
One piece is provided, and the other member is provided with a recess corresponding to this protruding piece.
The rotary shaft is allowed to rotate in one predetermined direction, is prevented from rotating in the other direction, and is provided with a mechanical control mechanism for giving a repulsive force in the predetermined direction to the rotary shaft. is there. Therefore, the rotation direction can be regulated in a desired direction only by adding a mechanical control mechanism having a simple structure ,
For direct current motors that require a direct current power source, for noise removal coils and for starting
A condenser or a deceleration gear that rotates only in one direction.
It is not necessary to use a single-phase induction motor equipped with a
It becomes possible to use a simple single-phase induction motor for driving .

[0022]

[0023] In addition those provided between the mechanical control mechanism as described above, for example, an eccentric drive member which rotates together with the rotating shaft, a ring-shaped pressing member for eccentric motion is driven by the eccentric drive member The structure is simple, and no additional parts for mechanical control mechanism are required, which makes it easy to reduce the cost of the entire pump .

Further, the mechanical control mechanism as described above is provided on the outer circumference of the eccentric drive body with a projecting piece or spring piece having a spring property formed in the direction opposite to the predetermined rotation direction, and on the inner circumference of the pressing member. The structure with the locking recess formed so that the tip of the protrusion abuts, the structure is extremely simple and the operation is reliable, and the inner peripheral side of the protrusion or spring piece is impregnated with lubricating oil. By arranging the oil-impregnated material, it is possible to constantly supply the lubricating oil to the periphery of the oil-impregnated material, and it is possible to obtain a tube pump with low operating noise and long life.

[Brief description of drawings]

FIG. 1 is a schematic front view of a tube pump according to an example of an embodiment of the present invention.

FIG. 2 is a front view and a cross-sectional view of the above eccentric drive body.

FIG. 3 is a front view and a side view of an inner ring of the pressing member of the above.

FIG. 4 is a front view of a modified example of the eccentric drive body.

FIG. 5 is a front view of another modification of the eccentric drive body.

[Explanation of symbols]

1 Outer member 3 tubes 4 Pressure member 41 Inner ring 5 Eccentric drive 6 rotation axes 7 Single-phase induction motor 8 Mechanical control mechanism 8a protrusion 8b Locking recess 8e Spring piece 9 Oil-containing material 11 tube pump

Claims (6)

(57) [Claims] 1. A ring-shaped pressure member which is eccentrically moved and a circular shape.
The tube is arranged between the outer member having the inner periphery of the shape,
The tube is squeezed sequentially in the longitudinal direction by the pressure member.
It is configured to deliver the fluid in the
In a tube pump equipped with a single-phase induction motor,
A member on the rotating shaft side driven by the single-phase induction motor,
A protrusion provided on either one of the fixed side members and this protrusion
Corresponding to the concave portion provided on the other side,
Allows rotation in one direction while rotating in the other direction
The projections engage the recesses to prevent rotation, and
Mechanical control configured to apply the repulsive force of a rotating shaft
A tube pump characterized by having a mechanism. Wherein said mechanical control mechanism, an eccentric drive member which rotates together with the rotation shaft, according to claim 1 is provided between the ring-shaped pressing member for eccentric motion is driven by the eccentric drive member The described tube pump. 3. The mechanical control mechanism comprises a projecting piece formed on the outer circumference of the eccentric drive member in a direction opposite to a predetermined rotation direction and having a spring property, and a tip of the projecting piece on the inner circumference of the pressing member. The tube pump according to claim 2 , wherein the tube pump is configured with an engaging recess formed in an abutting shape. 4. The tube pump according to claim 3, wherein an oil-impregnated material impregnated with lubricating oil is arranged on the inner peripheral side of the protrusion. 5. The spring member, wherein the mechanical control mechanism is attached to the outer circumference of the eccentric drive member so as to project in the direction opposite to the predetermined rotation direction, and the tip of the spring piece is provided on the inner circumference of the pressing member. The tube pump according to claim 2 , wherein the tube pump is configured with an engaging recess formed in an abutting shape. 6. The tube pump according to claim 5, wherein an oil-impregnated material impregnated with lubricating oil is arranged on the inner peripheral side of the spring piece.