JPS626309Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a peristaltic pump that can change the discharge amount.

Conventionally, peristaltic pumps have a rotor connected to a drive shaft inserted into a housing, a guide section fixed between the housing and the rotor, and an elastic tube that is compressed and released by the rotor inserted between the rotor and the guide section. It is publicly known.

Such a peristaltic pump with a fixed guide part has the disadvantage that it is not possible to adjust the expansion of the elastic tube or change the discharge amount by using elastic tubes with different outer diameters.

In order to solve this problem, a peristaltic pump was developed in which a guide part is provided between the housing and the rotor, as shown in Figures 1 and 2, which can be moved relative to the rotor by means of a screw screwed into the housing. It was done. In the figure, 2 is a housing, 3 is a drive shaft, 4 is a rotor, 5 is a screw, and 6
is a guide portion, and 7 is an elastic tube. As is clear from the figure, the distance between the guide portion 6 and the rotor 4 can be adjusted by moving the screw 5 back and forth. With this structure, the guide portion 6 can restrict the expansion of the elastic tube 7 between it and the rotor 4, or elastic tubes with various external shapes can be used, thereby eliminating the above-mentioned drawbacks.

However, in this case, since the screws are moved forward and backward by hand, the screws tend to be over-tightened. Such a screwed state prevents appropriate deformation of the elastic tube, resulting in unstable discharge.

This invention aims to eliminate such drawbacks.

The peristaltic pump according to this invention has a rotor connected to a drive shaft inserted into a housing, and a guide part that is movable relative to the rotor by a screw screwed into the housing is provided between the housing and the rotor. An elastic tube that is compressed and released by a rotor is inserted between the tubes, and is characterized by the following features.

In other words, an elastic body is provided between the housing and the side of the guide section opposite to the side that contacts the screw, which contacts both but does not contact the elastic tube, and presses the guide section away from the rotor. It is to establish.

With this structure, when the guide section is moved by the screw in a direction toward the rotor, the presence of the elastic body prevents the guide section from exerting strong pressure on the elastic tube, thereby preventing excessive screwing. At this time, since the elastic body is not in contact with the elastic tube and is not interposed between the elastic tube and the guide section, the expansion of the elastic tube can be restricted by the guide section as in the conventional case. Furthermore, the presence of the elastic body allows the elastic tube to fit better into the guide portion. Furthermore, when the screw is turned in a direction away from the rotor, the guide section is pushed by the elastic body and follows the screw, which widens the space between the guide section and the rotor, which also has the advantage of making it convenient to replace the elastic tube. .

The shape and material of the elastic body used in this invention are not particularly limited; for example, a plate spring or a sponge body can be used. The rotor may have at least two rollers, and any rotor with a known structure can be used.

To explain this idea based on the drawing, the third
In the figure, a rotor 4 coupled to a drive shaft 3 is inserted into a housing 2 which has stepped portions 1, 1 on its inner periphery. The rotor 4 is formed by placing two disks facing each other and extending eight pins therebetween, and attaching a rotating roller to each pin, as shown in FIG. An arcuate guide portion 6 is provided between the housing 2 and the rotor 4 and is movable relative to the rotor 4 by a screw 5 screwed into the housing 2. An elastic tube 7, which is compressed and released by the rotor 4, is inserted between the rotor 4 and the guide portion 6. Between the stepped portions 1, 1 of the housing 2 and the side of the guide portion 6 opposite to the side that contacts the screw 5, the guide portion 6 is connected to the rotor by contacting both but not contacting the elastic tube 7. Elastic bodies 8, 8 are provided that press in a direction to separate from 4. Reference numerals 9 and 9 are holding parts that hold the discharge side and suction side of the elastic tube 7.

4 and 5 show another embodiment of the structure in which the elastic body is installed, and shows the side opposite to the side pushed by the screw 5 of the cylindrical guide part 6 with respect to the drive shaft 3, and the circular inner surface. Elastic bodies 8, 8 are provided between the housing 2 and the housing 2, which contact both of them but do not contact the elastic tube 7, and press the guide portion 6 in a direction to separate it from the rotor 4. The cylindrical guide part 6 has a tube introduction hole 10 in its diameter direction.
10 is provided and inserted between the rotor 4 and the guide portion 6 at a location where the elastic tube 7 is compressed and released. 11 is a bearing coupled to the housing 2. With this configuration, since the inner surface of the housing 2, the guide portion 6, and the rotor 4 are all circular, the machining accuracy is good, and the material and shape of the elastic body 8 can be freely selected in addition to the dimensions.
This has the advantage of being easier to manufacture. In addition, by inserting the pin 13 implanted in the guide part 6 into the small hole 12 provided in the housing 2, it is possible to prevent the guide part 6 from wobbling during operation of the pump.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional peristaltic pump, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a front view of the peristaltic pump of this invention, and Fig. 4 is a sectional view of a peristaltic pump in which an elastic body is installed. A sectional view showing another embodiment, FIG.
It is a sectional view taken along the line B-B in FIG. 2... Housing, 3... Drive shaft, 4... Rotor, 5... Screw, 6... Guide section, 7... Elastic tube, 8... Elastic body.

Claims (1)

[Claims for Utility Model Registration] (A) A rotor 4 coupled to a drive shaft 3 is inserted into the housing 2, (B) A screw 5 screwed into the housing 2 is inserted between the housing 2 and the rotor 4 to connect the rotor to the housing 2. (C) An elastic tube 7 that is compressed and released by the rotor 4 is inserted between the rotor 4 and the guide part 6; (D) The housing 2 and the guide part 6 are provided with a movable guide part 6. An elastic body 8 is provided between the screw 5 and the side opposite to the side in contact with the screw 5, which contacts both but does not contact the elastic tube 7, and presses the guide part 6 in a direction away from the rotor 4. Peristaltic pump.