Multi-layered flow passage member and ultrasonic wave fluid measuring device

Abstract

An objective of the invention is to provide a multilayered flow passage member that enhances fluid measurement accuracy of an ultrasonic fluid measurement apparatus and an ultrasonic fluid measurement apparatus using the multilayered flow passage member. When fusible projections 20 are fused by a heating head 21 while, partition plates 11 are inserted into side plates 13 and 14, a fused state provided by the heating head 21 changes according to either side of each of the partition plates 11, because fuse surfaces at leading ends of the respective fusible projections 20 are sloped in the vertical direction. An outermost end of each of fusible projections 25 that first contacts the heating head 21 is first fused. During a course of the fusible projections 25 being fused toward their roots, the partition plates 11 are pressed against ends of respective insert holes 17a that are on the opposite side of the outermost ends that are first fused. As a result, the partition plates 11 become one-sided with respect to the respective insert holes 17a and fixed by means of positional accuracy of the insert holes 17a. Even when clearance exists between the partition plates 11 and the insert holes 17a, the partition plates can be fused with superior accuracy.

Description

[0001] This application is a divisional application of the application filed on November 5, 2009 with the application number 200980134518.1 and the title of the invention is "Multilayer Flow Path Component and Ultrasonic Fluid Measuring Device Using It". technical field [0002] The present invention relates to a multilayer flow path member having a measurement flow path composed of a plurality of flat flow paths and an ultrasonic fluid measurement device using the same. Background technique [0003] The ultrasonic fluid measuring device is a device that flows a fluid through a measurement channel, propagates ultrasonic waves in the measurement channel, measures the propagation time of the ultrasonic waves, and obtains the fluid flow velocity based on the measured information. [0004] Furthermore, the flow path for measurement has a rectangular shape with a rectangular cross section, and a pair of ultrasonic transceivers are provided on opposite short sides. [0005] The pa...

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Problems solved by technology

[0024] However, when forming the flow channel for measurement as a multilayer flow channel, there are problems as follows: due to the positional relationship between the pair of ultrasonic transducers and the multilayer flow channel installed in the flow channel for measurement and the use of support for forming In the case of the two edges of the rectifying plate of the multi-layer flow channel, the dimensional deviation between the rectifying plates has the problem of reducing the measurement accuracy. In order to perform high-precision measurement, high-precision multi-layer flow channel components are required.

[0025] In addition, in the former example of using the flow channel for measurement as a multi-layer flow channel, a plurality of rectifying plates and the support parts supporting them are integrally insert-molded using thermosetting resin, which requires time for hardening It takes a very long time to take out the molded product from the molding die after injecting the resin into the molding die, which leads to poor productivity and a corresponding increase in cost.

[0026] Therefore, if a thermoplastic resin is used instead of a thermosetting resin, the shrinkage will be large, so there is a disadvantage that the dimensional accuracy cannot be achieved in this way. In addition, in the latter example, the groove portion is made of an opening larger than the thickness of the rectifying plate. It is constituted with a receiving part having the same size as the plate thickness of the rectifying plate. The receiving part is formed closer to the front end of the groove in the depth direction than the opening. The rectifying plate is guided by the guide part of the opening and introduced into the receiving part. The plate maintains high dimensional accuracy and applies a moment to the holding part, so strength is required, and the depth of the receiving part needs to be ensured sufficiently

[0027] However, from the viewpoint of moldability, when resin is used for the measuring tube forming the housing part, the thickness must be increased in order to maintain strength. However, when it becomes thicker, shrinkage, pores, etc. cause the opposite problem of reduced dimensional accuracy. Therefore, a balance of workability such as strength, precision, and ease of insertion is necessary, and as a result, there is a disadvantage that high precision cannot be pursued.

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