公开(公告)号：US11982389B2

公开(公告)日：2024-05-14

申请号：US17932811

申请日：2022-09-16

Applicant: K.D.W. Company Limited

Inventor： Kwok Din Wong ,  Sai Hin Wong ,  Hang Yan Wong

IPC: F16L39/00

CPC classification number: F16L39/005

Abstract: A double containment fitting for engagement with double containment pipes and comprising a one-piece integral structure having at least one outer cylinder having at least two outer receiving openings, at least one inner cylinder having at least two inner receiving openings, and a plurality of ribs integral with and spacing the at least one outer cylinder from the at least one inner cylinder, thereby forming an inner fitting flow area within the inner cylinder and forming an outer fitting flow area between the at least one outer cylinder and the at least one inner cylinder and between adjacent ribs. Each inner tube of the double containment pipes are connected to the double containment fitting by being located within one of the inner receiving openings. Each outer tube of the double containment pipes are connected to the double containment fitting by being located within one of the outer receiving openings.

公开(公告)号：US12226065B2

公开(公告)日：2025-02-18

申请号：US17697586

申请日：2022-03-17

Applicant: K.D.W. Company Limited

Inventor： Kwok Din Wong ,  Li Zhou ,  Sai Hin Wong ,  Hang Yan Wong

IPC: A47L15/00 ,  A47L15/42 ,  F28D1/06 ,  F28D7/10 ,  F28D7/14 ,  F28D21/00 ,  F28F3/12 ,  F28F3/14

Abstract: A dish washing machine including a housing having an interior wash space and a liquid inlet. A spray nozzle sprays the liquid onto dishes. The machine further includes a heating tank for heating the liquid which is supplied to the rotating spray nozzle. A heat exchange system transfers heat from the liquid heated by the heating tank to the liquid added from the liquid inlet. The heat exchange system comprising a pipe system defining a first path therethrough and a second path therethrough, with the first heat exchange system transferring heat from liquid in the second path to liquid in the first path. A first surface portion of the pipe system of the first path engaging the liquid in the first path having a greater thermal conductivity than a second surface portion of the pipe system of the second path engaging the liquid in the second path.