JPH0828453A - Tube pump - Google Patents

Abstract

PURPOSE:To adjust the discharge pressure of fluid by pressing an elastic tube with a roller between the arcuate surface in a casing and the roller to form a portion of the arcuate surface into a movable press part for adjusting the movement amount in a pump for forcing the fluid in the elastic tube. CONSTITUTION:When fluid in an elastic tube 12 is forced from the direction A to the direction B, a motor is driven to rotate a roller holder 22 in the direction C. Rollers 24 mounted to the roller holder 22 are turned in the diraction C on a circular track. That is, the rollers 24 are rolled in the turning direction C on the circular track within an angular range shown by ANC while pressing the elastic tube 12 between the roller and the inner wall surface 13 of a casing 10. A portion of the elastic tube in which the inner wall surfaces of the elastic tube 12 adhere to each other moves along the arcuate surface 13 of the casing 10 along with the rolling of the roller. Thus, the fluid in front of the adhering portion is forced in the direction B. Then, when the discharge pressure of the fluid is adjustably increased or reduced, a bolt 42 is pivoted to swing the press part 26.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a tube pump,
More specifically, a casing in which a part of the inner wall surface is formed in an arc surface, an elastic tube formed of an elastic material and arranged along the arc surface in the casing, and the arc surface in the casing And a roller that is provided so as to be able to swivel along a circular orbit along a line and that pushes the fluid in the elastic tube while pressing the elastic tube between the circular surface and the circular surface corresponding to the circular surface. .

[0002]

2. Description of the Related Art Conventionally, tube pumps have been used to pump fluids such as water and fluids. In a tube pump, an elastic tube made of an elastic material is arranged along a circular arc surface inside a casing whose inner wall surface is partly formed into a circular arc surface, and swirls with a circular orbit along the circular arc surface. It is possible, and a structure is provided in which a plurality of rollers are provided for pressing the elastic tube between the arc surface and the fluid in the elastic tube, and the rollers are rotated by a motor. When the motor is driven, the roller rolls on the elastic tube while pressing the elastic tube between itself and the arcuate surface to narrow the flow path in the elastic tube. With this rolling, the part where the flow path is narrowed moves along the arc surface. Due to this movement, the fluid in the elastic tube ahead of the portion where the flow path is narrowed is pumped forward. The fluid is pumped one after another by a plurality of rollers continuously repeating this operation.

[0003]

However, the above-mentioned conventional tube pump has the following problems. When adjusting the discharge pressure of the fluid, conventionally, it is necessary to provide a dedicated adjusting mechanism (for example, a pressure adjusting valve) outside the tube pump, which causes a problem that the mechanism is complicated and large, and the cost increase cannot be avoided. is there. Therefore, an object of the present invention is to provide a tube pump capable of adjusting the discharge pressure of fluid with a simple structure.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, a casing in which a part of the inner wall surface is formed in an arc surface, an elastic tube formed of an elastic material and arranged along the arc surface in the casing, and in the casing along the arc surface A tube pump provided rotatably with a circular orbit, and comprising a roller for pressing the elastic tube between the circular surface corresponding to the circular surface and pressing the elastic tube and pumping the fluid in the elastic tube, It is characterized in that a part of the casing forming the arcuate surface is formed in a pressing portion capable of moving inward, and the casing is provided with an adjusting means capable of adjusting a movement amount of the pressing portion. In particular, a plurality of the pressing parts and the adjusting means may be provided.

[0005]

[Operation] The operation will be described. An elastic tube is formed between the roller and the arc surface by forming a part of the casing forming the arc surface in the pressing portion that can move inward and providing the casing with adjusting means that can adjust the movement amount of the pressing portion. Since the contact pressure between the inner wall surfaces of the fluid can be adjusted, the discharge pressure of the fluid can be adjusted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a front sectional view showing an internal structure of a tube pump according to an embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a partial sectional view showing in detail a structure near a pressing portion of a tube pump according to an embodiment. Is. Reference numeral 10 denotes a casing, which is formed of a metal plate in the shape of a hollow drum. The inner wall surface of the casing 10 is formed into an arc surface 13. An elastic tube 12 is formed of an elastic material (for example, natural rubber or synthetic rubber) and is inserted into the casing 10. The elastic tube 12 is introduced from the inlet 14 of the casing 10, is attached along the inner wall surface that is the arc surface 13, and is led out of the casing 10 from the outlet 16. Usually, the fluid in the elastic tube 12 is sent from the arrow A direction to the arrow B direction.

Reference numeral 18 is a motor, for example, a geared motor is used. The motor 18 is fixed to the back surface of the casing 10. The rotation direction of the motor 18 can be changed by changing the polarity of the voltage applied to the motor 18. The output shaft 20 of the motor 18 rotatably projects into the casing 10. A roller holder 22 is arranged in the casing 10 and is fixed to the output shaft 20 of the motor 18 at the center. Therefore, the roller holder 22 is rotated by the motor 18.

Reference numerals 24 are rollers, which are arranged at both ends of the roller holder 22, respectively. Each roller 24 is rotatable about a rotation shaft 28 with respect to the roller holder 22. By rotating the roller holder 22, the roller 2
Reference numeral 4 denotes an inner wall surface of the casing 10, and an elastic tube 12
Can be swung with a circular orbit along an arc surface 13 attached to. The distance between the circular arc surface 13 of the casing 10 and the circular orbit of the roller 24 is set smaller than the outer diameter of the elastic tube 12, and the roller 24 is on the circular orbit corresponding to the circular arc surface 13 (in the present embodiment). For example,
On a circular orbit in the range of 180 degrees shown in the angular range ANG), the elastic tube 12 is pressed between the arc surface 13 (inner wall surface) of the casing 10 and the fluid in the elastic tube 12 is pumped. In the present embodiment, the direction of rotation of the roller 24 is the forward direction in the arrow C direction (clockwise direction in FIG. 1) and the reverse direction in the opposite direction. The peripheral portion of the roller 24 is R
It is chamfered.

A pressing portion 26 is formed by engraving a part of the outer circumference of the casing 10 in a U-shape. The tip end 30 of the pressing portion 26 is formed as a free end portion, and the base end 32 of the pressing portion 26 is connected to the outer peripheral surface of the casing 10. Therefore, as shown by the chain double-dashed line 34 in FIG.
It can be moved inward. Since the tip end 30 of the pressing portion 26 also contacts the elastic tube 12, the corner portion is chamfered (C chamfer or R chamfer) in order to prevent damage to the elastic tube 12. 36 is a fixing metal fitting, which is formed in a gate shape. The fixing fitting 36 is fixed to the outer periphery of the casing 10 so as to straddle the pressing portion 26. Fixing bracket 3
A female screw hole 38 is formed in the member 6.

Reference numeral 40 denotes a lock nut, which is screwed to a bolt described later and regulates the screwing amount of the bolt into the female screw hole 36. Reference numeral 42 denotes a bolt which is an example of an adjusting means, which is screwed into the female screw hole 36 of the fixing metal fitting and has its tip reaching the outer surface of the pressing portion 26. When the bolt 42 is screwed into the female screw hole 36, the pressing portion 26 is elastically deformed by the pressing force and moves inward by the amount of screwing of the bolt 42. Therefore, the amount of inward movement of the pressing portion 26 can be adjusted by the bolt 42. The screwing amount of the bolt 42 is regulated by the lock nut 40 as described above.

Next, the operation of the tube pump having the above structure will be described. When the fluid in the elastic tube 12 is pressure-fed from the arrow A direction to the arrow B direction in a normal state, the motor 18 is driven to rotate the roller holder 22 in the arrow C direction. Then, the roller 24 attached to the roller holder 22 turns in the direction of arrow C on the above-mentioned circular orbit. When the roller 24 turns, the roller 24 presses the elastic tube 12 between the inner wall surface 13 of the casing 10 and the inner wall surface 13 of the casing 10 on the circular orbit of the roller 24 in the range indicated by the angle range ANG to bring the inner wall surface of the elastic tube 12 into close contact. While (Fig. 3
See) Roll on the elastic tube 12 in the turning direction. As the roller 24 rolls, the portion where the inner wall surfaces of the elastic tube 12 are in close contact with each other moves along the arc surface 13 of the casing 10. By this movement, the fluid ahead of the contact portion is pressure-fed in the direction of arrow B. The two rollers 24 are the motor 1
By the continuous rotation of 8, the fluid can be pumped one after another by repeating this operation continuously. When the fluid is pumped in the reverse direction, the motor 18 may be rotated in the reverse direction. In this case, the roller 24 turns in the direction opposite to the arrow C direction, and the roller 24 can pump the fluid in the elastic tube 12 in the opposite direction by the same action as described above.

For example, depending on the application, it may be necessary to adjust the discharge pressure of the fluid to be pumped. When the current discharge pressure is too low, the bolt 42 is screwed in and the pressing portion 26 is pushed inward. Then, when the roller 24 passes in front of the pressing portion 26, the distance between the roller 24 and the pressing portion 26 becomes short, so that the pressure for adhering the inner wall surfaces of the elastic tube 12 to each other becomes large. Therefore, the discharge pressure of the fluid can be increased.

On the other hand, if, as a result of increasing the discharge pressure, the discharge pressure becomes excessive, the bolt 42 is loosened. Then, the pressing portion 26 tries to return to the outside by its elasticity and the elastic restoring force of the elastic tube 12. When the pressing portion 26 moves to the outside, the distance between the roller 24 and the pressing portion 26 becomes longer when the roller 24 passes in front of the pressing portion 26, so that the inner wall surfaces of the elastic tube 12 are brought into close contact with each other. Pressure decreases. As a result, the flow path resistance of that portion is reduced, so that the discharge pressure of the fluid passing therethrough can be reduced. By adjusting the screwing amount of the bolt 42, the discharge pressure of the fluid can be adjusted to a desired pressure before and after the operation as well as during the operation.

FIG. 4 shows the experimental results when the discharge pressure of the fluid was adjusted using the tube pump of this embodiment. Graph D shows the relationship of the discharge pressure of the fluid (water in this experiment) to the movement amount (deformation amount) of the pressing portion 26 under the following condition 1, and graph E shows the movement of the pressing portion 26 under the following condition 2. Fluid for the amount (deformation amount) (water in this experiment)
The relationship of the discharge pressure of is shown. (Condition 1) Diameter of roller 24: 108 mm Outer diameter of tube 12: 62 mm Inner diameter of tube 12: 38 mm Rotation speed of roller holder 22: 60 rpm (Condition 2) Diameter of roller 24: 109 mm Outside tube 12 Diameter: 62 mm Inner diameter of tube 12: 38 mm Rotational speed of roller holder 22: 60 rpm Both graphs show good linear characteristics that show a substantially proportional relationship with the inward movement amount (deformation amount) of the pressing portion 26. It shows the characteristics that enable precise adjustment and automatic adjustment. Also, +2 for the state where the movement amount (deformation amount) = 0
It is understood that the discharge pressure can be practically adjusted in a wide range of 0% to -20%.

In the above embodiment, since the roller 24 is in the angular range ANG = 180 degrees corresponding to the circular arc surface 13 of the casing 10, even if the number of the rollers 24 is two, one of the rollers 24 is always in the angular range. Could be present in the ANG. Since the angle range ANG can be appropriately changed in the design of the tube pump, the number of rollers 24 is set to 3 or more according to the angle range ANG so that one or more rollers 24 are always present in the angle range ANG. May be. Further, two or more adjusting means such as the pressing portion 26 and the bolt 42 may be provided within the angle range ANG. By providing a plurality, it is possible to make finer adjustment than in the present embodiment. that's all,
Although various preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and many modifications can be made without departing from the spirit of the invention.

[0016]

When the tube pump according to the present invention is used, a part of the casing forming the arcuate surface is formed in the pressing portion that can be moved inward, and the adjusting means that can adjust the moving amount of the pressing portion to the casing is provided. With a very simple structure to install,
Since the contact pressure between the inner wall surfaces of the elastic tube can be adjusted between the roller and the arc surface and the discharge pressure of the fluid can be adjusted, the mechanism is not complicated and the size is not increased.
It has a remarkable effect such as cost reduction can be suppressed.

[Brief description of drawings]

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

FIG. 2 is a plan view of the tube pump of the embodiment.

FIG. 3 is a partial cross-sectional view showing a configuration near a pressing portion.

FIG. 4 is a graph showing the relationship between the amount of movement of the pressing portion and the magnitude of discharge pressure in the example.

[Explanation of symbols]

 10 Casing 12 Elastic Tube 13 Arc Surface of Inner Wall of Casing 14 Casing Inlet 16 Casing Outlet 18 Motor 20 Output Shaft 22 Roller Holder 24 Roller 26 Pressing Part 28 Rotating Shaft 30 Pressing Part Tip 32 Pressing Part Base End 34 Pressing Part Moving Position 36 Fixed Metal fittings 38 Through holes 40 Fixing nuts 42 Bolts

Claims (2)

[Claims] 1. A casing in which a part of an inner wall surface is formed in an arc surface, an elastic tube formed of an elastic material and arranged along the arc surface in the casing, and the arc in the casing. A tube pump provided with a circular orbit along a surface so as to be rotatable, and a roller for pressing the elastic tube between the circular surface and a circular surface corresponding to the circular surface while pressing the fluid in the elastic tube. The tube pump, wherein a part of the casing forming the arc surface is formed in a pressing portion that can move inward, and the casing is provided with an adjusting unit that can adjust a movement amount of the pressing portion. . 2. The tube pump according to claim 1, wherein a plurality of the pressing portions and the adjusting means are provided.