JPS634064B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary switching valve suitable for an apparatus having multiple channels such as an automatic chemical analyzer.

[Prior Art] In automatic chemical analyzers, for example, when introducing a sample together with a reagent into one of a large number of reaction tubes, a one-way multi-way switching valve as shown in FIG. 1 is conventionally used. . In FIG. 1, numeral 1 is a first fixed member supported by a support mechanism not shown, and numeral 2 is a rotating member that rotates by rotation of a rotating shaft 3. As shown in FIG. A second fixing member 4 is provided to support the rotating member 2 together with the fixing member 1 under pressure. 5 is a coil spring for pressing the fixing member 4. The coil spring 5 is interposed between the second fixing member 4 and a nut 7 screwed onto the support member 6. The second fixing member 4 is provided with a conduit 9 connected to an opening aligned with the central axis of rotation 8 . Also, a conduit 1 is connected to the rotating member 2.
0 is provided, and the first fixed member has a number of openings bored on the circumference of the same radius centered on the rotation center axis 8, and a number of flow channels connected to each of the openings. 11a, 11b, . . . , 11n, . 12 is a bearing for rotating the shaft 3.

In such a configuration, as the rotating member 2 rotates, the conduit 10 sequentially opens the channels 11a, 11b, . . .
. . , 11n, .
It is distributed to 1b, . . . , 11n, .

[Problems to be Solved by the Invention] However, as the distance from the central axis 8 increases, the rotation member 2
As the circumferential speed increases, only the peripheral portion wears out faster due to friction between the rotating member and the stationary member. Therefore, the service life of such conventional switching valves is much shorter than originally expected.

Furthermore, in conventional switching valves like this,
For example, if the seal on the surface indicated by A in FIG. 1 is insufficient, and in order to strengthen the seal on this surface, the nut 7 is rotated to compress the coil spring 5. Even if the sealing surface B is good, extra pressure is applied to the sealing surface B, which has the disadvantage that the contact surface between the rotating member and the stationary member is worn out more than necessary.

The present invention has been made with the object of eliminating the drawbacks of such conventional one-path multi-way switching valves and providing a switching valve with a long life.

[Means for Solving the Problems] The one-channel multi-way switching valve based on the present invention includes a rotating member having a conduit that communicates an opening provided at a position coinciding with the rotation center axis with a peripheral portion of the rotation; a first fixed member having a plurality of conduits in contact with the rotating member at a periphery thereof and connectable to openings provided in the periphery; and a first fixed member contacting the rotating member at a center of rotation and aligned with the central axis. a second fixing member having a conduit that communicates with the opening provided at the position, one of the fixing members is completely fixed, and the rotating member is connected to the one fixing member at the contact surface of the two members. A first pressing member that presses the other fixed member via the first elastic body from a direction substantially perpendicular to A second pressing member that presses through the body is provided, and the contact pressure between the first fixed member and the rotating member and the second fixed member are determined by the screwing positions of the first and second pressing members. The present invention is characterized in that the contact pressure between the rotating member and the rotating member can be adjusted independently.

[Example] An example of the present invention will be described in detail below based on the drawings.

In FIG. 2, 13 is a donut-shaped first fixing member that is completely fixed by a support mechanism not shown, and 14 rotates integrally with the rotating shaft 15 and is movable minutely along the direction of the rotating shaft. It is a rotating member that is rotated. 16 is a first elastic body made of, for example, a coil spring, and 18 is a first pressing body made of, for example, a nut, which is screwed into the bearing 17. The degree of compression of the coil spring 16 can be adjusted by rotating a nut 18. The nut 18 presses the rotating member 14 against the fixed member 13 via the coil spring 16 in a direction substantially perpendicular to the contact surface between the two members. Reference numeral 19 denotes a second fixing member that is supported by a support mechanism (not shown) so as to be able to move minutely along the direction of the axis. 20 is a second elastic body made of, for example, a coil spring, and 21 is a second pressing body made of, for example, a nut, which is screwed onto the support member 22. The degree of compression of the coil spring 20 can be adjusted by rotating a nut 21. The nut 21
is the fixing member 1 via the coil spring 20.
9 is pressed against the rotating member 14 from a direction substantially perpendicular to the contact surface between the two members. The second fixed member 19 is provided with a conduit 24 connected to an opening formed at a position that coincides with the central rotation axis 23 , and the rotary member 14 is provided with a conduit 24 that is connected to an opening that is formed at a position that corresponds to the central rotation axis 23 . opening and central axis 23 of the periphery
A conduit 25 is provided which connects the opening provided at a radius r from the opening. First fixing member 13
A large number of openings are bored at predetermined intervals on the circumference of a radius r on the surface that contacts the rotating member,
Each of these openings is a tube 26a, 26b, . . . , 26n, .
are connected to each of the Although these conduits are not shown, they are, for example, connected to different reaction tubes.

In the single-path multi-way switching valve having such a configuration, the rotating member 14 is rotated to sequentially connect the conduit 25 to the conduit 26.
If you connect to a, 26b,..., 26n...,
The liquid sent through the conduit 24 can be sequentially distributed to a large number of different channels.

Now, in a switching valve with such a configuration, the second
The fixed member 19 contacts the rotating member 14 at the center of rotation, and the first fixed member 13 contacts the rotating member 14 at the periphery of rotation.
Since the contact pressure between the second fixed members 13, 19 and the rotating member 14 can be set independently depending on the screwing positions of the first and second nuts, The contact pressure between the fixed member 13 and the rotating member 14 can be set to be weaker than the contact pressure between the second fixed member 19 and the rotating member 14.

Furthermore, if the sealing of the contact surface between the rotating member 14 and the first fixed member 13 or the second fixed member 19 becomes defective, only the contact pressure of the defective contact surface can be adjusted. There is no negative effect such as excessively increasing the contact pressure on the contact surface, such as hastening the wear of this surface.

Note that the rotating member 14 and the first and second fixed members 1
3 and 19, the first and second fixed members are equivalent to the rotating member 14, and either one can be completely fixed and the force can be applied from either one. . For example, in the above embodiment, the first fixing member is completely fixed, but the second fixing member is completely fixed, and the first fixing member is slightly moved along the direction of the rotation axis. The first fixing member may be supported and pressed against the rotating member via an elastic body.

[Effects of the Invention] As described above, according to the present invention, it is possible to independently adjust the contact pressure between the rotating member and the two fixed members in the single-channel multi-way switching valve, and to suppress wear of the members to a low level. It is possible to extend the life of the switching valve.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional one-channel multi-way switching valve, and FIG. 2 is a diagram showing an embodiment of the present invention. 13: first fixed member, 14: rotating member, 1
5: Rotating shaft, 16: First elastic body (coil spring),
17: bearing, 18: first pressing body (nut),
19: second fixing member, 20: second elastic body (coil spring), 21: second pressing body (nut), 2
2: Support member, 23: Rotation center shaft, 24, 25,
26a,..., 26n,...: Conduit.

Claims (1)

[Claims] 1. A rotating member having a conduit that communicates a position coinciding with the central axis of rotation with an opening provided at the peripheral portion of the rotation, and a conduit that contacts the rotating member at the peripheral portion of the rotation and is connected to the opening provided in the peripheral portion. a first fixing member having a plurality of conduits that can be rotated, and a second fixing member having a conduit that contacts the rotating member at the center of rotation and communicates with an opening provided at a position coinciding with the central axis. a first pressing force that completely fixes one fixed member and presses the rotating member against the one fixed member from a direction substantially perpendicular to a contact surface of both members via a first elastic body; and a second pressing member that presses the other fixed member against the rotating member via a second elastic body from a direction substantially perpendicular to a contact surface between the two members, and the first and second pressing members are provided. The contact pressure between the first fixed member and the rotating member and the contact pressure between the second fixed member and the rotating member can be adjusted independently depending on the screwing position of the second pressing member. Multi-way switching valve.