JPS6342212Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a flow path switching device that can switch between pressurized or vacuum flow paths without leaking gas or liquid.

[Prior art]

FIG. 2 is a diagram showing a conventional flow path switching device,
In the figure, 1 is a fixed plate, 2 is a flow path provided in the fixed plate 1, 3 is a sliding plate, 4 is a plurality of flow paths provided in the sliding plate 3, and 5 is a flow path that penetrates the sliding surface. Road 2, 4
This is a plate-shaped sealing material that prevents fluid from leaking.

The conventional device is configured as described above, and for example, switching the flow path between the fixed platen 1 and the sliding platen 3 is done by sliding the sliding platen 3 and switching between the predetermined flow path 4 of the sliding platen 3 and the fixed platen. This is done by moving it so that it communicates with the flow path 2 of No. 1.

[Problem that the invention attempts to solve]

However, in this conventional device, a plate-shaped sealing material 5 is used, and a flow path is provided in the plate-shaped sealing material 5 itself, so when the sliding plate 3 moves, the contact resistance causes the plate-shaped sealing material to There was a possibility that 5 would be deformed and the flow path would be blocked. Furthermore, since the plate-shaped sealing material 5, which has a flow path formed therein, and the fixed platen 1 are in direct contact with each other, in order to communicate the flow paths 2 and 4 of both plates 1 and 3, both flow paths 2, It is necessary to accurately align the position of 4, and a moving mechanism (not shown) for the sliding plate 3 is required.
The disadvantage was that high dimensional accuracy was required.

This idea was made to eliminate the above-mentioned drawbacks, and it maintains a sufficient seal and provides a smooth, smooth surface.
The object of the present invention is to obtain a flow path switching device that can easily switch the flow paths.

[Means for solving problems]

The flow path switching device according to this invention has a pair of plates each having a flow path formed therein facing each other with a predetermined minute gap between them, and an opening formed on the opposing surface around the open end of the flow path of one of the plates. An annular groove is provided inside the groove, and an O-ring that is pressed by both discs is provided in this groove.

[Effect]

In this invention, one of the plates is moved parallel to the opposing surface while the O-ring is pressed, and the channels formed in both plates are successively communicated to switch the channels.

〔Example〕

FIG. 1 is a diagram showing a flow path switching device in one embodiment of this invention. In the figure, 1 is a fixed plate with a smooth surface, 2 is a flow path passing through the fixed plate 1, and 3
A sliding plate is disposed opposite to the fixed plate 1 with a small gap therebetween, and is configured to be movable parallel to the opposing surface. Reference numeral 4 indicates a channel passing through the sliding plate 3, 6a indicates an annular O-ring groove formed around the open end 4a of each channel 4 and opens to the opposing surface, and 6 indicates this O-ring groove 6a.
This is an O-ring inserted into the Then, the O-ring 6 is pressed by both plates 1 and 3. Both boards 1 and 3
From the results of experiments, it is desirable to adopt a dimension that is 1/3 or less of the diameter of the O-ring 6 and does not hinder the movement of the sliding plate 3 as the distance between the O-ring 6 and the above-mentioned minute gap.

In addition, although a circular cross-sectional shape of the O-ring 6 is shown in FIG. 1, it is not necessarily limited to a circular shape. Various shapes can be used as long as the entire width can be pressed to the extent that it does not touch the board.

Then, the flow path switching is performed by moving the sliding plate 3 as in the conventional case and sequentially communicating the flow paths 2 and 4 formed on both the plates 1 and 3; Since the formed flow channels 2 and 4 are directly opposed to each other, there is no possibility that the flow channels are blocked due to deformation of the plate-shaped sealing material 5 as in the conventional case.

Furthermore, regarding the present invention, as shown in Figure 1,
The gap formed by the fixed platen 1 and the sliding platen 3 sealed with an O-ring 6 becomes a part of the flow path,
The diameter of this flow path is larger than the diameter of the flow paths 2 and 4 of the fixed plate 1 and the sliding plate 3, so the flow path 2 of the fixed plate 1
When communicating the flow path 4 of the sliding plate 3, it is sufficient that the open ends of the two flow paths 2 and 4 coincide within the range of the inner diameter of the O-ring 6. The dimensional tolerance for the travel distance at the time of road switching can be larger than in the conventional example.

[Effect of idea]

As described above, in this invention, an annular groove that opens to the opposing surface is provided around the open end of the flow path of one of the plates, and an O-ring that is pressed by both plates is provided in this groove. This has the effect that the flow passages of the plate are not blocked due to deformation of the sealing material as in the conventional case, and that the dimensional tolerance for the moving distance of the plate required to communicate each flow passage is increased.

[Brief explanation of drawings]

1A and 1B are a plan view and a side sectional view showing a flow path switching device in an embodiment of this invention, and FIG.
Figures A and B are a plan view and a side sectional view showing a conventional flow path switching device. In the figure, 1 and 3 are a pair of plates, a fixed plate and a sliding plate, respectively, 2,
4 is a flow path, 4a is an open end, 6 is an O-ring, and 6a is an O-ring groove. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Each of the plates facing each other through a predetermined minute gap and arranged to be relatively movable parallel to the opposing surface is provided with a flow path passing through the plate in a direction perpendicular to the opposing surface, and one In a device that performs flow path switching by communicating a flow path formed in one of the plates with a plurality of flow paths formed in the other plate by the above-mentioned movement, a flow path formed in any one of the plates mentioned above. A flow path switching device characterized in that an annular groove opening to the opposing surface is provided around the open end of the flow path switching device, and an O-ring pressed by both the plates is provided in the groove.