Multilayer channel member and ultrasonic fluid measuring device using same

Abstract

Provided are a multilayer channel member enabling improvement of the accuracy of measurement of a fluid by an ultrasonic fluid measuring device and an ultrasonic fluid measuring device using the same. Fusion projections (20) are fused by a heating head (21) while partition plates (11) are inserted between side plates (13, 14). Since the welding surfaces of the tip portions of the fusion projections (20) are inclined vertically, the states of fusion of the upper and bottom surfaces of each partition plate (11) by the heating head (21) are different. The tip portion of each fusion projection (25) first brought into contact with the heating head (21) is fused first, and the fusion progresses to the root portion of the fusion projection (25). During the fusion, the partition plates (11) are pressed against the edges of insertion holes (17a) opposite to the tip portions fused first, biased with respect to the insertion holes (17a), secured with the position accuracy by the insertion holes (17a), and thus can be welded accurately even if there is a gap between a partition plate (11) and the insertion hole (17a).

Description

technical field [0001] 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 [0002] 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. [0003] 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. [0004] The pair of ultrasonic transceivers are arranged so as to form an ultrasonic propagation path at a predetermined angle with respect to the flow direction of the measurement flow path, that is, obliquely crossing the fluid flow direction. [0005] Furthermore, in...

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Problems solved by technology

[0023] 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.

[0024] 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.

[0025] 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

[0026] 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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