Fluid pressure reducing device

A fluid pressure reducing device that is mounted in a fluid treatment device including an inlet pipe (11a) through which a high-pressure fluid is introduced and an outlet pipe (11b) through which a low-pressure fluid is discharged, to induce fluid pressure reduction, the fluid pressure reducing device comprising:

• an annular disk A (100) configured to have an outer diameter and an inner diameter;
• and
• an annular disk B (200) configured to have an outer diameter and an inner diameter, which are the same as the outer diameter and the inner diameter of the disk A, wherein the disk A (100) and the disk B (200) are concentrically coupled to each other as a pair of disks,
• wherein a plurality of diffuser cells having a trapezoidal shape of a narrow top and a wide bottom are formed from an inner circumferential surface (500) to an outer circumferential surface (400) so as to stand upright, so that a diffuser a (110) is radially formed in the disk A (100), a plurality of diffuser cells having trapezoidal shapes are formed from the inner circumferential surface (500) to the outer circumferential surface (400) so as to be perpendicular to a radial direction, so that a diffuser b (210) is formed in the disk B (200), and the disk A (100) and the disk B (200) are concentrically coupled to each other so that the diffuser a (110) crosses the diffuser b (210), thereby forming a pressure reduction flow path, and a plurality of sets of the disk A and the disk B are integrally coupled to each other,
• wherein the diffuser a (110) of the disk A (100) includes:
• an upper open cell a (111) provided adjacent to the inner circumferential surface (500) of the disk A (100) and having a trapezoidal shape with a narrow upper end that is open so as to form a first port (510) of the fluid;
• a lower open cell a (114) provided adjacent to the outer circumferential surface (400) of the disk A (100) and having a trapezoidal shape with a wide lower end that is open so as to form a second port (410) of the fluid;
• and
• at least one closed cell a-1 (112) and a closed cell a-2 (113) having a trapezoidal shape, which are provided in two rows between the upper open cell a (111) and the lower open cell a (114) at a predetermined interval, in which positions of a row of the closed cell a-2 (113) and a row of the closed cell a-1 (112) are offset from each other,
• wherein the diffuser b (210) of the disk B (200) including the plurality of diffuser cells have a plurality of closed cell b-1 and a plurality of closed cell b-2 having trapezoidal shapes, which are provided between the outer circumferential surface (400) and the inner circumferential surface (500) of the disk B (200) and are formed in a direction from the inner circumferential surface to the outer circumferential surface at predetermined intervals,
• wherein the closed cell b-1 (211) and the closed cell b-2 (212) are formed, in which a direction perpendicular to a direction in which the diffuser cells of the diffuser a (110) are formed to connect a flow path between the closed cell a-1 (112) and the closed cell a-2 (113), and
• wherein the trapezoidal shapes of the closed cell b-1 (211) and the closed cell b-2 (212) are alternately reversed such that widths thereof are gradually increased in a flow direction of the fluid, thereby allowing the fluid to repeat diffusion flow.