JPS6329897Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application This invention relates to improvements in liquid pumps used for suction and discharge of liquid samples in spectrophotometers and the like.

(B) Prior art Pumps that transfer liquid by pressing and squeezing a soft liquid feeding tube with rollers attached around a rotating body may suffer from problems if the liquid feeding tube is left for a long time with the rollers pressing the liquid feeding tube. In some cases, the liquid feeding tube becomes deformed over time, reducing the flow rate or making liquid feeding impossible. Therefore, it is preferable to remove the force applied to the liquid feeding tube except when liquid is being fed; however, if the force is removed, the liquid in the liquid feeding tube flows out from the suction port or the discharge port, which may be inconvenient. For example, when using a flow cell in a spectrophotometer, the inside of the cell becomes empty and becomes unusable due to dust adhering to it and drying out, or it may flow back into the inlet and spill on a desk or the like.

(c) Purpose This idea was created in view of the above circumstances.
The present invention provides a liquid feeding pump that closes the liquid feeding tube at a separate location to prevent liquid from flowing out of the liquid feeding tube when no force is applied to the liquid feeding tube when the liquid is not being fed.

(D) Structure In this invention, the moving and fixing mechanism of the guide member is provided with a liquid feeding tube closing means for blocking a part of the liquid feeding tube when liquid is not being fed. a rotating body with a plurality of rollers attached thereto; a guide member provided opposite to the periphery of the rotating body and movable toward or away from the periphery; and between the rollers of the rotating body and the guide member. In a liquid feeding pump comprising a liquid feeding tube arranged, and a moving and fixing mechanism for a guide member that moves and fixes the guide member so that the guide member presses the liquid feeding tube during liquid feeding, the moving and fixing mechanism includes a guide member. This liquid feeding pump is characterized in that it is provided with a liquid feeding tube closing means for closing a part of the liquid feeding tube extending from between the rotating body and the guide member in conjunction with the operation of releasing the fixation of the liquid feeding tube.

(E) Example This invention will be explained in detail below with reference to the drawings of the example.
This invention is not limited to the following examples.

FIG. 1 shows the overall structure of a liquid pump 1. As shown in FIG.

2 is a rotating body, 3 is a guide member, 4 is a liquid feeding tube, and 5 is a moving and fixing mechanism for the guide member 3. A plurality of rollers 6 are attached around the rotating body 2. A guide member 3 is provided so as to surround this rotating body 2, and is supported by a shaft support 7 so as to be rotatably movable. The guide member 3 is positioned such that its inner circumferential surface 8 faces the periphery of the roller 6 of the rotating body 2, and is movable toward or away from the periphery when supporting the shaft support 7. It is becoming. The soft liquid feeding tube 4 is supported at two points on the upper part of the guide member 3 and is arranged between the rotating body 2 and the guide member 3.

The moving and fixing mechanism 5 includes a large first lever 9 and a second lever 10 that is interlocked with the first lever 9.
, springs 11 and 12 that bias the respective levers 9 and 10 in the pulling direction, and the second lever 1
The first lever 9 and the second lever 10 are supported by shaft supports 14 and 15, respectively, and are urged to rotate in the directions of arrows A and B by the action of springs 11 and 12, respectively. has been done. The second lever 10 is locked to a locking pin 13 to restrict its rotation range.

The operation of the above embodiment will be explained below.

FIG. 1 shows the state of liquid feeding. That is, the pressing end 16 of the first lever 9 presses the guide member 3 to move and fix it, and the liquid feeding tube 4 is clamped between the guide member 3 and the roller 6 of the rotating body 2 in a pressed state. The locking portion 17 of the first lever 9 is locked to the locking portion 18 of the second lever 10, and the second lever 10 is locked to the locking pin 13 at this time. As the rotating body 2 rotates in this state, the liquid in the liquid feeding tube 4 is pushed by the roller 6 and liquid is fed.

With the rotating body 2 stopped rotating and liquid feeding stopped, the second lever 10 is pushed in the direction of arrow C against the biasing force of the spring 12. Due to this pushing, the locking portion 18 of the second lever 10 is
It climbs over the locking portion 17 of the lever 9 and separates from the locking portion 17. In this case, the guide member 3 must move toward the rotating body 2, but for example, the guide member 3 must move toward the rotating body 2.
This is made possible by only slightly rotating the rotating body 2 and rotating the roller 6 from the state shown in the figure. Simultaneously with the release, the first lever 9 rotates in the direction of arrow A due to the bias of the spring 11. As the first lever 9 rotates in the A direction, the protruding end 19 of the first lever 9 located on the opposite side to the pressing end 16 causes the liquid feeding tube 4 to extend from between the rotating body 2 and the guide member 3.
occlude part of the 20 is a fixed block, and a projecting end 19 of this fixed block 20 is connected to the liquid feeding tube 4.
Press and close. The protruding end 19 of the first lever 9 serves as a means for closing the liquid feeding tube 4. Note that when the first lever 9 is released from the lock, the second lever 10 automatically returns to its original position due to the bias of the spring 12. To return from this state to the state shown in Figure 1, in which liquid is being pumped, press the first lever 9.
is rotated in the reverse A direction so that the locking part 18 is connected to the locking part 17.
After that, both levers 9 and 1
0 can be rotated in directions A and B by relying on the bias of the springs 11 and 12, respectively. Of course, when the second lever 10 stops rotating at the locking pin 13, both levers 9 and 10 are connected to their respective locking portions 1.
7 and 18 are locked.

FIG. 2 shows another embodiment.

In this case, a protruding end 19 serving as a closing means is provided on the second lever 10. In the state shown in FIG. 2, the configuration in which the pressing end 16 presses the guide member 3 is the same as that shown in FIG. 1. The first lever 9 then positions the second lever 10 in a locked configuration, in which the projecting end 19 is in a position to open the liquid pipe 4 . Now, when the second lever 10 is pushed in the direction of arrow D and both the locking parts 17 and 18 are released, the first lever 9 and the second
The lever 10 is successively pulled back by springs 11 and 12 and rotated in the directions of arrows E and F. 21 is a locking pin that restricts the rotation range of the first lever 9. Then, when the second lever 10 returns downward, the protruding end 19 closes the liquid feeding tube 4.

In each of the above-mentioned embodiments, the closing means of the movable and fixed mechanism 5 has a structure that directly closes the liquid feeding tube 4. In that case, for example, the switch may be turned on by the protruding end 19 of the above embodiment.

(F) Effect This device is structured as described above,
According to this invention, a liquid-sending pump is provided that does not apply force to the liquid-sending tube when liquid is not being sent, and does not cause outflow from the inlet or outlet of the liquid-sending tube. In particular, a blocking means is provided on the moving and fixing mechanism,
Since the liquid supply tube is closed in conjunction with the operation of releasing the guide member, it is convenient in that a separate operation for closing the liquid supply tube is not required.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of an embodiment of this invention, and FIG. 2 is a front view showing a main part of another embodiment of this invention. DESCRIPTION OF SYMBOLS 1...Liquid feeding pump, 2...Rotating body, 3...Guide member, 4...Liquid feeding tube, 5...Moving and fixing mechanism, 6...Roller, 19...Protruding end (closing means).

Claims (1)

[Scope of utility model registration request] A rotating body with a plurality of rollers attached to its periphery; a guide member that faces the periphery of the rotating body and is movable toward or away from the periphery; and between the rollers of the rotating body and the guide member. A liquid feeding pump consisting of a liquid feeding tube disposed in the liquid feeding tube, and a moving and fixing mechanism for a guide member that moves and fixes the guide member so that the guide member presses the liquid feeding tube during liquid feeding. A liquid feeding pump characterized in that a liquid feeding tube closing means is provided for closing a part of the liquid feeding tube extending from between the rotating body and the guide member in conjunction with an operation of releasing the fixation of the member.