JP4037861B2 - Fluid discharge path structure - Google Patents

Description

  The present invention relates to a liquid discharge path structure suitable for discharging a fluid or the like from a plurality of discharge ports or from nozzles attached thereto, and in particular, discharge amount from each discharge port. It should be uniform enough.

  For example, as an ejection path used for efficiently dispensing and applying a liquid substance such as an adhesive or an electronic material, as shown in FIG. There is a type in which the liquid material flowing in from 101 is naturally branched and flowed to the required number of discharge ports 102, and the liquid material is discharged simultaneously from the nozzles 103 attached to the discharge ports 102 under the movement of the nozzles 103. .

  By the way, in such a conventional technique, when the nozzles 103 are arranged in a horizontal row as shown in the figure, the length of the branch flow path from the one inlet 101 to each discharge outlet 102 is measured. In addition to the fact that the length varies depending on the position of the discharge port 102, the longer the branch flow path, the greater the flow resistance and the greater the pressure loss. There is a problem of variation in the discharge amount or application amount, which is mostly in the short central part of the flow path and gradually decreases toward the end part, and this tendency also applies to liquids with low viscosity and compressible gases. It is almost the same.

  The present invention has been made as a result of studying as a subject to solve such problems of the prior art. The object of the present invention is to provide a plurality of liquids introduced from one inlet. When discharging from the discharge port or the nozzle mounted on it, the discharge path of the fluid can make the discharge amount at all the discharge ports sufficiently uniform regardless of the relative position of the discharge port with respect to the inflow port To provide a structure.

The fluid discharge path structure of the present invention is provided with a plurality of stages of flow path branching sections that branch the flow path from one fluid inlet to a plurality of outlets, each of which is a single unit. in each of the flow path branching portion consisting of compartments, I der that respective lengths of the nature of the branching paths together substantially equal, in a longitudinal section, compartment forming a flow path branching portion of the upper side The lateral width of the lower branch side of the lower channel branch adjacent to the lower channel branch part is configured to be wider, and the upper and lower compartments thereof are arranged at the center of the lower branch chamber branch path. It is characterized in that it is communicated with a straight pipe line that is arranged on the extension line and has no bend, and the pipe line is formed shorter than any branch path in the upper and lower compartments communicated therewith. It is .

Here, preferably, the lengths of the branch paths are made substantially equal between the respective flow path branch portions in the same branch stage.
According to this, the total length of the branch path until the fluid flowing in from one inflow port reaches each discharge port is the same regardless of the number of stages of the flow path branching section. Regardless of the arrangement position, they are substantially the same, and as a result, the pressure loss is almost equal regardless of which branch the fluid passes through, so that the amount of fluid discharged from each outlet is sufficiently uniform. be able to.

By the way, even when the lengths of the respective branch paths in each flow path branch section are substantially equal, the pressure loss of each branch path is related to the inner contour shape in the cross section of the flow path branch section. Since there is a possibility that they may not be sufficiently equal, more preferably, each branch path is made such that at least one of the distance from the inner surface of the flow path branch section and the distance from the center of the flow path branch section is substantially equal. To make the pressure loss more uniform.
And this means that each branch path is located at approximately the same distance from the center of the flow path branching section and point-symmetrically with respect to the center, and at the same distance from the center line of the flow path branching section. It is also effective when arranged symmetrically with respect to the center line.
Moreover, it is preferable that the number of branch paths is two in all the compartments, and that the compartments do not communicate with each other in the same branch stage.

  Thus, according to the present invention, by making the total length of each branch path from one fluid inlet to a plurality of outlets substantially equal, the pressure loss of the fluid passing through which branch is reduced. The discharge amount of the fluid discharged from each discharge port can be made uniform with high accuracy.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 1 (a) is a schematic vertical cross-sectional view, and FIG. 1 (b) is a schematic cross-sectional view of one flow path branching portion. is there.
This shows a case where the flow path of the liquid flowing in from the inlet joint 1 is branched at each of the three branch stages 2, 3, and 4 and discharged from a total of 16 nozzles 5 arranged in a line. Therefore, here, the liquid flowing in from one inlet joint 1 as a fluid inlet is branched and flowed to 16 discharge ports 6, and the branching mode is the first branch stage 2. Two flow path branch portions provided in the second branch stage 3 by branching the liquid into two equal and substantially equal length branch paths 8 by the one flow path branch section 7 provided 9, the liquid is further divided into two equal, substantially equal-length branch paths 10, and four flow path branch portions 11 formed in the third branch stage 4. Each of the four branch paths 12 is made to branch into approximately equal-length branch paths 12, and the lengths of the branch paths are made substantially equal between the flow path branch portions located in the same branch stage.

  Here, in order to evenly divide the liquid in each of the flow path branch portions 7 and 9, the flow path branch portion 7 is taken as an example and surrounded by an imaginary line as shown in a cross-sectional view in FIG. It is preferable that the respective branch paths 8 shown are present at an equal distance from the inner surface of the flow path branching section 7 and are also disposed at an equal distance from the center O of the flow path branching section 7. According to this, since the liquid flowing through any of the branch paths 8 is subjected to substantially the same liquid friction, flow path friction, etc., and the pressure loss is also substantially equal, the next branch from both branch paths 8 The liquid discharge amount to the stage 3 is substantially equal, and this is the same for the liquid discharge amount from the second branch stage 3 to the third branch stage 4.

  By the way, in the flow path branching section 11 in the third branching stage 4, since the liquid is branched into the four branching paths 12, the lengths of the two branching paths 12 closer to the center are the other two. Although it is inevitably shorter than that of the book, in the first place, the branch path length in this flow path branch section 11 is much smaller than the total length of each branch path 8, 10, 12 The difference in the length of the branch path 12 in the flow path branching portion 11 is almost negligible with respect to the total length. Therefore, the liquid from each discharge port 6 and by extension, the nozzle 5 is obtained. The discharge amount is also sufficiently uniform.

  In order to further improve the discharge amount accuracy, the number of branch paths in the flow path branching section 11 of the third branch stage 4 is set to two, and the added fourth branch stage is further provided. It is possible to further provide two branch paths in the flow path branching section, and according to this, the total length of each branch path from the inlet joint 1 to the discharge port is made more equal. be able to.

  According to the configuration as described above, the liquid flowing from the inlet joint 1 to the flow path branching portion 7 is branched into two, and both flow into the respective flow path branching portions 9 under substantially equal pressure loss. Each of them is also branched in two in the same way, and also flows into each flow path branch section 11 with substantially equal pressure loss between both flow path branch sections 9, and four each. In this case, the total length of each of the branch paths 8, 10, 12 is substantially equal, and the liquid passing through each branch path is discharged from the nozzle 5 through the respective discharge ports 6. Since the pressure losses are almost equal, the liquid discharge amount from each nozzle 5 can be made uniform with high accuracy. This is the same when the nozzles 5 are arranged in a staggered manner instead of arranging all the nozzles 5 in a line.

2 and 3 are respectively schematic cross-sectional views showing other branch forms of the flow path in the flow path branching section, in particular, the flow path branching sections 7 and 9. as an example, the inner contour circle in its horizontal cross-section, a square, when an equilateral triangle, each branch channel 8 enclosed by a phantom line in the figure, at any transverse plane, the flow path branching portion The distances from the inner surface and the center of 7 are equal.
Here, each of the branch paths 8 shown in FIG. 2 has a substantially equal distance from the center O of the flow path branching section 7 and is positioned point-symmetrically with respect to the center O. The distances from the center line of the road branching portion 7 are both substantially equal, and are located symmetrically with respect to the center line in a plane passing through the center line and passing through the two branch paths.

  By the way, as the branch path provided in the flow path branch portion of the final branch stage, the arrangement shown in FIG. A configuration is preferred.

The maximum discharge amount between nozzles when the adhesive material containing filler is discharged using the discharge path structure according to the present invention in which the number of nozzles is 30, the nozzle interval is 3 mm, and the branch stage is 3 stages. When the variation rate was determined, it was 19.5% in the embodiment of the present invention, and the maximum variation rate when the same number of nozzles were arranged at 1 mm intervals based on the prior art shown in FIG. 4 was 27.5%.
Therefore, in this embodiment, it is possible to reduce the variation rate to about 5/7 even if the nozzle interval is tripled.

1 is a schematic longitudinal sectional view and a transverse sectional view showing an embodiment of the present invention. It is a rough line cross-sectional view which shows the other arrangement | positioning aspect of a branched path. It is a rough line cross-sectional view which shows the other arrangement | positioning aspect of a branch path. It is a basic line longitudinal cross-sectional view which shows a prior art.

Explanation of symbols

1 Inlet joint 2, 3, 4 Branch stage 5 Nozzle 6 Discharge port 7, 9, 11 Channel branch 8, 10, 12 Branch

Claims (8)

Provided with a plurality of stages for branching the flow path from one fluid inlet to a plurality of outlets, each in a flow path branch consisting of a single compartment , It is a fluid discharge path structure in which the length of each natural branch path is approximately equal ,
Within the longitudinal section, the lateral width of the compartment forming the upper flow path branching section is configured wider than the distance between the fluid inlets of the lower flow path branching section adjacent to the flow path branching section,
The upper and lower compartments are communicated with straight straight pipes that are arranged on the extension line of the center of the lower branch compartment, and the upper and lower compartments communicated with the upper and lower compartments. Being shorter than any branch path in the compartment
Fluid discharge structure characterized by 2. The fluid discharge path structure according to claim 1, wherein the lengths of the branch paths are made substantially equal between the respective flow path branch portions in the same branch stage. The discharge path structure according to claim 1 or 2, wherein the distance of each branch path from the inner surface of the flow path branching section is substantially equal. The discharge path structure according to any one of claims 1 to 3, wherein the distances of the respective branch paths from the center of the flow path branch section are substantially equal. The discharge path structure according to any one of claims 1 to 4, wherein the respective branch paths are disposed at substantially equal distances from the center of the flow path branching portion and point-symmetrically with respect to the center. The discharge path structure according to any one of claims 1 to 5, wherein the respective branch paths are arranged symmetrically with respect to the center line at substantially the same distance from the center line of the flow path branch portion. 7. The discharge path structure according to claim 1, wherein the number of branch paths is two in all the compartments . The discharge path structure according to any one of claims 1 to 7, wherein the compartments do not communicate with each other in the same branch stage .

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