JPH0175823U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a graph showing experimental results of the present invention. FIGS. 3A and 3B are sectional views showing different embodiments of the present invention. FIGS. 4A and 4B are graphs showing experimental results for different comparative examples. FIG. 5 is a sectional view showing a conventional example, and FIG. 6 is a graph showing experimental results. 2...Pipe reduction part, 3...Blowout nozzle, 5...
Pipe expansion portion, 6a, 6b...control nozzle, 7a,
7b... Return flow path, 8a, 8b... First partition, 1
0a, 10b...Discharge path, 11...Second partition wall, 1
1a, 11b...First curved surface, 11c...Second curved surface, 11d, 11e...End portion, 12...Target, 14...Sensor, 17, 20... Curved surface portion with large radius of curvature, 18 ... Curved surface portion with a small radius of curvature, 19 ... Plane portion, X ... Middle equivalent position, Y ... Half range of the first partition wall.

Claims (1)

[Scope of utility model registration request] Pipe reduction section 2, jet nozzle 3, and pipe enlargement section 5
are formed in series in the flow direction, and a pair of control nozzles 6a and 6b are provided at the boundary between the jet nozzle 3 and the expanded pipe section 5, oriented in a direction substantially perpendicular to the jet direction of the jet nozzle 3. A pair of return flow passages 7a and 7b are formed to face each other and connect the control nozzles 6a and 6b to the downstream side of the pipe enlarged portion 5, and the return flow passages 7a ，
A pair of discharge passages 10a, 10b each connected to 7b separately.
, a target 12 for stabilizing flow direction switching in the expanded pipe section 5, and a flow rate measurement sensor 14 for detecting a change in pressure or flow rate caused by a change in the flow direction of the jet flow from the jet nozzle 3. is provided, and the pipe enlarged portion 5 and the control nozzle 6a are provided.
, 6b and a pair of first partition walls 8a, 8b that partition and form the return channels 7a, 7b, the return channel 7 is
In order to form the second partition wall 11 which forms the starting end side portions of the return flow passages 7a and 7b and blocks the downstream side of the pipe enlarged portion 5, a pair of partition walls facing the starting end side portions of the return flow passages 7a and 7b are formed. first curved surfaces 11a, 11b,
and a second curved surface 11c facing the target 12 between the first curved surfaces 11a and 11b is formed into a substantially partially cylindrical shape recessed in the jetting direction of the jetting nozzle 3, and , a fluidic flowmeter provided with their center axes substantially parallel to each other, wherein the first partition walls 8a, 8
Each of the first partition walls 8a, 8b is provided with a half-cylindrical or approximately half-cylindrical outer circumferential surface, and the flat portion 19 or the curved surface portions 17, 20 having a large radius of curvature of the outer circumferential surfaces of the first partition walls 8a, 8b are connected to the tubes. The curved surface portion 18 with a small radius of curvature is connected to the passage enlarged portion 5 and the return passage 7.
a, 7b and control nozzles 6a, 6b, respectively,
In the ejection direction of the ejection nozzle 3, the first partition wall 8a or 8b and the first curved surface 11a or 11
The innermost part of the second curved surface 11c is arranged at a position X corresponding to approximately the middle of the innermost part of
The ends 11d and 11e of the partition wall 11 facing the inlets of the discharge passages 10a and 10b are connected to the first partition walls 8a and 8b in the ejection direction of the ejection nozzle 3, respectively.
A fluidic flowmeter is arranged in a range Y corresponding to the half of the jet nozzle 3 side.