JPS58155290A - Peristaltic pump - Google Patents

Abstract

PURPOSE:To facilitate the interchange of tubes by providing a leaf spring between a center hole of a pump head and a motor shaft, while placing both ends of the tube in communication with an external tube through magnet connectors. CONSTITUTION:A leaf spring 7 is engageably connected to a groove provided in a motor shaft 9 and prevented from protrusion by a spring support plate 11. Both ends of a tube 1 can be coupled in one touch manner to an external tube through a connector 14 having a magnetic body 13 to embedded and a connector 15 having a magnet 16 embedded. When the tube 1 is interchanged, a pump head 8 is pulled out together with the tube 1 against the spring force of the leaf spring 7. Then, the tube 1 is exposed so that it can be easily interchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peristaltic pump used for introducing a sample liquid into a flow-type chemical analyzer, and particularly to an improvement in its structure.

Generally, a method is used in which a reagent is added to a sample solution and reacted, and all of the reaction components are selectively analyzed. Two distribution methods are used. The distribution method has been widely used recently because it has all the great advantages of being able to process the sample solution continuously, and because it is quenched in the enclosure system, there is no need to worry about the foul odor inside the contaminated space coming in from the outside. It became so.

The most important mechanism in this tube circulation system is the pump that serves as the power source for transferring the sample liquid. Conventionally, a liquid transfer pump whose inner surface is coated with a corrosion-resistant material has been used, but recently flexible tube Peristaltic pumps of the tapping type are often used.

-This peristaltic pump, also known as the ``Stretching Pump'', has the following features:

(1) Simple configuration and low cost.

(2) Since the sample liquid flow path itself has a pumping action, the fluid flow is smooth and there are fewer problems such as clumping.

etc. However, while it has these advantages, it also has the following disadvantages.

(1) Since the durability and mechanical strength depend on the material of the tube, it becomes necessary to replace the tube after a predetermined period of time, and care must be taken in the maintenance and management of the tube.

FIG. 1 is a front view of a conventional peristaltic pump.

A tube 1 made of synthetic rubber having elasticity passes between a pair of left and right tube kites 2a, 2b and a plurality of rollers 3 to change its direction by 360 degrees, but the tube guides 2a, 2tl; A pair of screws 5 screwed into 4
a, 5b. In other words, the distance between the rollers 3 and the tube guide 2 is appropriately adjusted to increase the efficiency of movement.

An outline of the operation of the peristaltic pump constructed as described above will now be described. When the pump head, which has a plurality of rollers 8 attached on the same circumference, rotates in the direction of the arrow, the part of the tube 1 that is in contact with the tube kite 2aK hits the roller 3.
At the same time, the portion that is in contact with the tube guide 2b is also squeezed and discharged from the right side of the tube 1 in the direction of the arrow.

If the pump head makes one continuous rotation, it becomes possible to transfer the sample liquid within the tube 1 almost continuously.

If operated in this way for a long period of time, even the elastic tube l will become fatigued and worn out and the transfer state will change.
At this time, loosen screws 5a and 5bi and remove tube guide 2.
The tube 1 is replaced by increasing the distance between the tube 1 and the roller 3. After installing the new tube l, screws 5a, 51)
Tighten the tube 1 to a degree suitable for fluid transfer and fully fix the screw.

However, such a tube conversion method for peristaltic pumps has the following drawbacks.

(1) Is there an advantage that the tightness of the tube 1 can be fully adjusted with the screw 5? However, it takes time to replace and adjust the tube 1, and it is difficult to attach and detach it with one touch.

(2) In order to make the transfer flow rate variable, it is possible to convert and install tubes with different diameters, but it is difficult to fully control the force with which the tube 1 is pressed by the row 23, so the desired transfer flow rate can be adjusted. It's not easy to get. That is,
It is difficult to obtain a given flow rate quickly.

(3) There are many town 1aJ parts, and the structure is complicated and tends to be large.

The present invention aims to solve the above-mentioned drawbacks of the prior art and provide a peristaltic pump with easy tube replacement. A plate spring is interposed between the center hole of the pump head and the motor shaft of the drive motor that rotates the pump head for connection, and a connector with a magnetic material embedded in both ends of the tube and a connector with a magnet embedded in it are fitted. The main reason is that it is configured so that it communicates with the external tube.

FIG. 2 is a sectional view of a peristaltic pump which is an embodiment of the present invention. The pump head 8 has a plurality of rollers 3 rotatably attached on the same circumference.

The leaf spring 7 is fully engaged and connected to a groove provided in the motor shaft 9 with a hole in the center thereof, and the spring support plate 11 completely prevents the leaf spring 7 from protruding. A drive motor 6 for rotating the pump head 8 is housed in a case 12 that also serves as a tube guide 2.

When replacing the tube 1, pull out the pump head 8 together with the tube 1 against the spring force of the leaf spring 7. At this time, the tube 1 is in a protruding state, so that it can be easily replaced, and the tube 1 is always replaced with the same type of tube 1 having the same outer diameter. Therefore, the force of the roller 3 that presses the tube 1 is constant, and the structure of the pump head 8 is extremely simple and can be made smaller, especially since it is not necessary to fully adjust the distance between the roller 3 and the tube guide 2. Note that since the thickness of the tube 1 is not changed, the rotational speed of the drive motor 6 is changed when changing the flow rate.

FIG. 3 is a right side view of FIG. 2. As described above, the tube 1 can be replaced with a single touch by pulling out the pump head 8, but it is also possible to quickly perform the operation of connecting all the external tubes 16 at both ends. That is, at both ends of the tube l, a connector 14, which has an annular magnetic material 13i embedded in a fluorine-based resin shell, is fixed. L, external tube 1
7 is an annular magnet 16 which is fitted into a connector 15 embedded in the thread resin. At this time, the magnetic body 13 and the magnet 16 are attracted to each other, so that the connectors 14 and 15 can be joined with one touch.

With this configuration, the thickness of the tube 1'
(II: The transfer flow rate can be changed without changing it, and quantitative properties can also be obtained. Also, there is an advantage that the entire structure of the bonder can be simplified.

In the peristaltic pump of this embodiment, the entire tube used is treated as a lump, and changes in the transfer amount are achieved by changing the rotational speed of the drive motor. Therefore, the tube replacement work is extremely simple, and no adjustment work is required. The effect of not doing so can be obtained.

FIG. 4 is a perspective view of a peristaltic pump according to another embodiment of the invention, in which the same parts as in FIGS. 2 and 3 are designated by the same reference numerals. Both ends of the tube 1 are housed in a case 18 facing upward and are connected to an external tube 17 by a connector portion. The middle part of the tube 1 is guided by a tube guide 2 attached to a case 18 and curved, and is in contact with a plurality of rollers 2o. Note that these rollers 20
i is in contact with the outer periphery of the transmission wheel 19 located at its center.

On the other hand, when the case 18 with l tubes attached is fixed to the entrance of the case 12 housing the drive motor, the transmission wheel 19
and the rotating shaft of the drive motor 6 engage with each other to rotate the plurality of rollers 2.
It becomes possible to rotate o. Therefore, when the drive motor 6 is rotated, the tube IU is squeezed in one direction by the plurality of rollers 20, thereby preventing smooth liquid transfer.

By housing the tube in a U-shape in a removable case in the peristaltic pump of this embodiment, and rotating a plurality of rollers via a transmission wheel rotated by a drive motor, a VC is constructed in such a way that the pump is squeezed. This simplifies the tube replacement work and maintenance.'!Furthermore, by preparing another case with the tube installed in advance, the tube can be replaced even more quickly.

In the embodiment shown in FIG. 4, one transmission wheel 19 and a plurality of rollers 20 are used to squeeze the tube 1.
If the transmission wheel 19 is used as a transmission gear and the roller 20 is a roller provided around the teeth meshing with the transmission gear, the squeezing operation of the tube 1 can be ensured.

The peristaltic pump of the present invention has the advantage that the tube can be replaced extremely quickly.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional peristaltic pump, Fig. 2 is a sectional view of a peristaltic pump which is another embodiment of the present invention, Fig. 3 is a right side view of Fig. 2, and Fig. 4 is another embodiment of the present invention. FIG. 2 is a perspective view of an example peristaltic pump.

Claims (1)

[Claims] 1. It has a tube having elasticity and 5J flexibility and containing the fluid to be transferred, a guide and a plurality of rollers that clamp this tube, and the fluid to be transferred is 1. In a peristaltic pump for vibration transfer, a leaf spring is fully interposed between the center hole of the pump head, in which the plurality of rollers are mounted on the same circumference, and the motor shaft of the drive motor that rotates the pump paddle driver 11. Also, a peristaltic pump characterized in that a connector in which a magnetic material is embedded and a connector in which a magnet is embedded are fitted into both ends of the tube to communicate with the external tube.