JPS6211198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in tube pumps.

Conventionally, there have been various types of tube pumps.For example, as described in Japanese Patent Publication No. 19665-1987, tubes are arranged in a straight line and are arranged at regular intervals in an endless chain that circulates. A plurality of rollers are attached, and these rollers are pressed against the tube so that the fluid trapped in the tube between the preceding roller and the following roller is sent out to the discharge side of the tube by opening the preceding roller. There is something.

However, during operation, the fluid pressure in the tube on the discharge side is higher than the fluid pressure trapped between the rollers, so when the preceding roller opens, the high-pressure fluid on the discharge side flows backwards and smooths the flow. This means that proper fluid transfer will not be possible.

As a pump equipped with means for preventing this backflow, there is, for example, a tube pump as disclosed in Japanese Patent Application Laid-open No. 112805/1983.

This pump moves the following roller faster than the preceding roller along the curved inner surface of the U-shaped tube to reduce the pressure of the fluid trapped in the tube between both rollers on the discharge side before discharging. Increase the fluid pressure until it becomes equal to the fluid pressure of
After that, the preceding roller is released.

However, the opening speed of the leading roller,
In other words, because the action of separating the roller from the tube occurs in an extremely short time, a space corresponding to the volume of the portion where the roller was pressing the tube is suddenly created, and that space is instantly filled with fluid. There is a problem in that the fluid flows when trying to move the fluid, and the flow becomes pulsating, making it impossible to perform accurate fluid transfer.

In order to eliminate such problems, the present invention has the following features:
A plurality of rollers are movably arranged along a tube having an arcuate portion and a straight portion, and when the preceding roller reaches a connecting portion between the arcuate portion and the straight portion, the following roller presses the tube. The leading roller is positioned at the starting end of the circular arc portion, which is the starting end, and is gradually moved away from the tube as the preceding roller travels along the straight section. The speed of the roller is made faster than the running speed of the preceding roller, and as the preceding roller gradually moves away from the straight section of the tube, the fluid pressure that resists the fluid pressure on the discharge side that attempts to flow backwards is applied to the tube between the rollers. The present invention provides a tube pump configured to generate electricity within the tube.

Embodiments of the present invention will be described with reference to the drawings.
is a pump case, and the inner peripheral surface is formed into a substantially horizontally elongated oval shape. Reference numeral 2 denotes a flexible tube made of an elastic material such as rubber, which is disposed along the inner circumferential linear surface 1a of the pump case 1 from the lower end of the pump case 1 toward the upper end of the other side. The side of the guide cover 27 is aligned with the inner circumferential arcuate surface 27a of the guide cover 27, which will be described later, and is also brought into close contact with the linear surface 1a continuous with the arcuate surface 27a toward the discharge port 2b side.
Reference numeral 3 denotes rollers for pressing the tube 2. Four rollers are arranged at regular intervals on the link chain 5 driven by the chain wheel 4, and they circulate inside the pump case 1 along the guide plates 6 on both sides. It is set to operate. That is, the roller 3 is connected to the ball bearing 7
It is rotatably supported on a shaft 8 by means of a shaft 8, and is supported on both side plates 10, 10 provided on both sides of the link chain 5 via blocks 9 fixed to both ends of the shaft 8. It is designed to move around the guide plate 6 while bringing the end face into sliding contact with the guide plate 6. The pitch between these rollers 3, 3 is the interval at which the following roller is located at the starting end of the arcuate surface 27a, which is the tube starting end, when the preceding roller reaches the connection between the arcuate surface 27a and the linear surface 1a. It is formed in The side plate 10 has an opening 11 formed in a substantially inverted T shape, and the block 9 is fitted into the tip of the opening 11, and an annular spring 12 having a notch at the base end of the opening 11 is inserted. block 9 due to the repulsive force of the notch.
A pin 13 embedded in the block 9 is inserted into a small hole 14 formed in the thick walled portion of the base end of the side plate 10 to serve as a guide for the block 9.
Reference numeral 10' denotes auxiliary side plates attached to the link 5 alternately with the side plates 10 between adjacent side plates 10, which guide the tube 2. The guide plate 6 is formed into a generally horizontally elongated oval shape so that the peripheral guide surface has the arcuate portions 6a ₁ and 6a ₂ and the straight portion 6b connected to each other, and the guide cover 27
The circular arc portion 6a ₁ facing the circular arc surface 27a of the pump case 1 is formed to have a smaller diameter than the other circular arc surface 6a ₂ , and as the linear portion 6b goes toward the circular arc portion 6a ₂ on the smaller diameter side, the It is arranged to be gradually spaced apart from the straight line surface 1a. Further, the guide plates 6 are disposed on both sides of the chain wheel 4 and connected to each other by a connecting member 15, and one guide plate is connected around the support shaft 17 of the chain wheel 4 by a ball bearing 16. The straight portion 6b of the guide plate 6 is rotatably supported, and the back plate 18 is fixed to the other guide plate, and the back plate 18 is rotated around the central axis 17 by bolts 19 screwed into appropriate places on the back plate 18. Tube 2 position
It is designed so that it can be rotated in the vertical direction. That is, with the vault 19 slightly loosened, the back plate 1
8 and then tighten the bolt 19 again to set it. The chain wheel 4 is supported on the central shaft 17 via a roller clutch 20, and its boss portion 4a projects outward from the pump case 1 and is supported by a ball bearing 21. It is adapted to be driven by a prime mover 23 via a clutch 22. 24 is a housing provided on the back side of the pump case 1, which houses the ball bearing 21, and also serves as the bolt 19 described above to attach the pump case 1.
It is attached to. That is, the bolts 19 are inserted into the mounting holes 25 drilled in the housing 24, and screwed into the back plate 18 through the arc-shaped elongated holes 26 provided in the back of the pump case 1, and the guide plate 18 is inserted as described above. 6
It is designed to move up and down.

The guide cover 27 of the tube 2 is formed into an inverted L shape, and its inner peripheral surface is formed in a shape that matches the inner peripheral part 1a of the pump case 1, and the base end is attached to the lower end of one side of the pump case 1. A gutter-like member 28 is attached to the tip of the gutter-like member 28, and a latch member 30 is attached to the tip of the gutter-like member 28 via a leaf spring 29.
is fixed. Note that the guide cover 27 is latched onto a pin 31 provided on the pump case 1 when it is closed, and in this state, its arcuate surface 27
a and the circular arc portion 6a ₂ of the guide plate 6 are parallel to each other with a certain distance therebetween.

32 is a manual handle, and its base end boss portion 32
a is fitted onto the central shaft 17, and a grip portion 33 that can be raised and lowered is attached to the tip. 34 is a cover that closes the front opening of the pump case 1.

To explain the operation of the embodiment configured as described above, the chain wheel 4 is rotated through the roller clutch 22 which drives the prime mover 23, and the roller 3 is connected to the guide plate through the link chain 5 and the side plates 10, 10. 6, the fluid is sucked in from the suction port 2a of the tube 2, and is discharged from the discharge port 2b while being pressed by the roller 3. In FIG. When in position a, the second roller 3-2
At position a', the tube 2 is closed by both rollers. Next, the first roller 3-1 moves along the straight part of the guide plate 6 b, c, d...
While displacing the tube 2 with a displacement of g, the second roller 3-2 moves b', along the arc of the guide plate 6.
Displaced as c', d'...g', the fluid is discharged from the discharge port 2b. (This process is shown in FIGS. 8 to 14) In the present invention, the peripheral portion of the guide plate 6 is formed into a sliding surface such that the arcuate portions 6a1, 6a2 and the straight portion 6b are adjacent to each other. The rollers 3, which are provided at a constant interval on the outer circumference of the link chain 5 that circulates between these circular arc parts 6a1 and 6a2 and the straight part 6b, are parallel to the straight part 6b in the straight part 6b. The link chain 5 travels along a linear trajectory of the same length, but when the link chain 5 travels along a circular arc portion 6a1, the link chain 5 travels while following a trajectory on an arc with a longer arc length than this arc portion 6a1, and the Therefore, even if the flexible transmission body such as the link chain 5 circulates endlessly at a constant speed, the arc portion 6
Subsequent roller 3- running along the outer circumference of a1
1 moves faster than the preceding roller 3-2, which moves along the outer periphery of the straight section 6b, and due to the speed difference, the preceding roller 3-1 moves toward the tube 2.
Immediately before releasing the tube 2, the fluid pressure in the tube 2 starts to increase between it and the following roller 3-2, and as the leading roller 3-1 gradually moves away from the tube 2, The fluid pressure between both rollers is gradually increased to counteract the fluid pressure on the discharge side and push the fluid toward the discharge side, thereby preventing the fluid from flowing back into the tube 2 and eliminating pulsation.

Also, by loosening the bolt 19 and rotating the guide plate 6 around the support shaft 17 via the back plate 18 to move the straight portion 6b up and down, the roller 3 can be moved closer to or farther away from the tube 2. , the position at which the roller 3 opens the tube 2 is adjusted, and the time from when the tube 2 is completely compressed to when it is completely released is adjusted. In addition, in the event of a power outage, the roller clutch 2 rotates the center shaft 17 using the manual handle 32.
0, the chain wheel 4 can be rotated.

As described above, the present invention provides a pump case with an arcuate surface and a linear surface connected to the arcuate surface so that the tube can be brought into close contact with the tube along these surfaces. A guide plate formed by continuously forming a guide surface and a linear guide surface opposing the linear surface is disposed, and a plurality of rollers for pressing the tube are arranged around the guide plate using a flexible member such as a link chain. Arranged so that it can be operated via a transmission body,
In addition, the roller spacing is such that when the preceding roller reaches the continuous part between the circular arc surface and the linear surface, the following roller is located at the starting end of the circular arc surface which is the tube pressing start end, and This relates to a tube pump characterized in that the rollers running along the tube are gradually separated from each other as the rollers move along the tube linearly arranged along the linear surface. Since the leading roller moves while gradually separating from the straight part of the tube, not only can a sudden backflow of high-pressure fluid from the discharge side be eliminated, but also the structure described above The structure is such that the speed of the following roller traveling in the arc section is faster than the leading roller traveling in the straight section, so that the leading roller is trapped between the two rollers immediately before opening the tube. The fluid pressure in the tube part can be gradually increased, and therefore, the increase in fluid pressure resists the fluid pressure on the discharge side corresponding to the separation interval of the leading roller that gradually moves away from the straight part of the tube. It exerts an action of pressing the fluid on the discharge side, and can reliably prevent backflow and eliminate pulsation, allowing highly accurate fluid transfer.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an overall front view, Fig. 2 is a side view, Fig. 3 is a front view with the front cover removed, and Fig. 4 is a main part. 5 is a simplified front view of FIG. 4, and FIG. 6 is a partially omitted A-
A plan view of the A-line cross section, FIG. 7 is an explanatory diagram showing the movement process of the roller, FIGS. 8 to 14 are explanatory diagrams showing the closed state of the roller and tube at each position of the guide plate, and FIG. 15 is a conventional diagram. 3 is a graph showing changes in discharge amount due to pulsation of discharge fluid in the tube pump of FIG. 1...Pump case, 2...Tube, 2a...
...Suction port, 2b...Discharge port, 3...Roller, 5
... Link chain, 6 ... Information board, 6a ₁ , 6a ₂ ...
...Circular part, 6b...Straight part.

Claims (1)

[Claims] 1. The pump case is provided with a circular arc surface and a linear surface connected to the circular arc surface, and the tube is brought into close contact with the tube along these surfaces. A guide plate formed by continuous molding of opposing linear guide surfaces is disposed, and a flexible transmission body such as a link chain is run endlessly along the circumference of this guide plate, and this flexible transmission The body supports a plurality of rollers that press the tube so as to be located outside the travel locus of the flexible transmission body, and when the preceding roller reaches a continuous part between the circular arc surface and the straight surface. The roller spacing is such that the succeeding roller is located at the starting end of the circular arc surface that is the tube pressing start end, and the rollers that run along the linear guide surface are arranged linearly along the linear surface. A tube pump characterized in that the tube pump is configured to be gradually separated from each other as it is operated.