Fluid resistance device

Abstract

In order to provide a fluid resistance device that is easily manufactured, compact, accurate, and uniform in performance, the fluid resistance device comprises two members that have facing surfaces that face each other and a downstream end of the upstream side flow channel and an upstream end of the downstream side flow channel open at positions displaced from each other on the facing surfaces, and a ring body that is arranged to surround the downstream end opening and the upstream end opening and that forms the fluid resistance channel between the downstream end opening and the upstream end opening by being sandwiched by the facing surfaces, and is so configured that the ring body is made of a material harder than that of each member, and the ring body breaks into the facing surfaces by fastening two members so as to make the facing surfaces approach each other.

Description

technical field [0001] The present invention relates to a fluid resistance member used for measuring a flow rate, for example, to generate a pressure difference. Background technique [0002] In a differential pressure flow measuring device, a flow control device, etc., a fluid resistance member for generating a pressure difference is used. Typical fluid resistance members include an orifice member formed by opening fine holes in a plate material, a capillary member formed of a metal thin tube, and the like. [0003] Whether to use an orifice member or a capillary member is appropriately selected according to the flow rate, viscosity, etc. of the fluid. figure 1 , figure 2 etc., conventional capillary components are constructed by welding a metal capillary to a fluid channel formed on a block or the like. [0004] prior art literature [0005] Patent Document 1: Japanese Patent Laid-Open Publication No. 2009-204626 [0006] However, this welding operation is very time-...

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Problems solved by technology

[0006] However, the welding operation is very time-consuming and labor-intensive and requires a certain skill, and there is a problem that the cost increases.

In addition, when the fluid resistance is desired to be increased, the welding operation becomes more difficult if the thin metal tube is made thinner, so there is a problem that the thin metal tube has to be lengthened and compactness cannot be achieved.

In addition, since the capillary member needs to be limited to a certain size, there is also a process of bending the metal capillary tube. Since the inner diameter changes slightly during the bending process, the fluid resistance value changes, so it is difficult to use Uniform performance of each product

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