Dishwasher having a liquid transportation line

Patent metadata

Field	Value
Publication number	US-10610081-B2
Application number	US-201515328302-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Sep 2, 2014
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A dishwasher, in particular a commercial single-tank dishwasher or commercial multi-tank dishwasher, for washing washware includes a liquid transportation line ( 100 ) with at least one supply line for supplying liquid at a first temperature and comprising at least one discharge line for discharging liquid at a second temperature. The supply line and the discharge line run coaxially in relation to one another, so that either the supply line or the discharge line forms an internal line ( 10 ) which runs in the direction of extent of the liquid transportation line ( 100 ) within the respectively other supply line or discharge line which for its part forms an external line ( 20 ), and thereby form a countercurrent heat exchanger.

First claim

The invention claimed is:

1. A dishwasher for washing washware, wherein the dishwasher has a liquid transportation line comprising at least one supply line for supplying liquid at a first temperature and comprising at least one discharge line for discharging liquid at a second temperature, wherein the supply line and the discharge line run coaxially in relation to one another, so that one of the supply line or the discharge line forms an internal line which runs in a direction of extent of the liquid transportation line within the other of the supply line or discharge line which for its part forms an external line, and thereby form a countercurrent heat exchanger, wherein a continuous intermediate wall is provided between a wall of the internal line and a wall of the external line,
wherein the intermediate wall bears against the internal line at least in regions;
wherein at least one channel is formed between the intermediate wall and the internal line, wherein the at least one channel runs in the direction of extent of the liquid transportation line, wherein the at least one channel is fluidly connected to ambient atmosphere;
wherein the at least one channel is formed by a groove along an inner surface of the intermediate wall.

2. The dishwasher as claimed in claim 1 , wherein the internal line has a wall which is formed from a material which has a high specific thermal conductivity, and wherein the external line has a wall which is formed from a material which has a low specific thermal conductivity.

3. The dishwasher as claimed in claim 2 , wherein the material of the wall of the internal line is a metal and/or wherein the material of the wall of the external line is a plastic material.

4. The dishwasher as claimed in claim 1 , wherein the liquid which can be discharged by means of the discharge line is waste water and is supplied directly to a waste water system.

5. The dishwasher as claimed in claim 1 , wherein the liquid which can be supplied by means of the supply line is fresh water and is drawn directly from a drinking water system.

6. The dishwasher as claimed in claim 1 , wherein the external line is the supply line, and wherein the first temperature is at least 30 K lower than the second temperature.

7. The dishwasher as claimed in claim 1 , wherein the at least one channel is connected to a sensor device in order to detect liquid escaping from the internal line into the channel.

8. The dishwasher as claimed in claim 7 , wherein the sensor device is in the form of a pressure sensor.

9. The dishwasher as claimed in claim 7 , wherein the sensor device is in the form of an optical sensor which is arranged at at least one line end of the liquid transportation line, in order to detect liquid escaping from the at least one channel.

10. The dishwasher as claimed in claim 1 , wherein a T-shaped connection piece which is composed of plastic, having a connection for the external line and having a connection for the internal line is provided at at least one line end of the liquid transportation line.

11. A dishwasher, comprising: at least one tank, and a liquid transportation line comprising at least one supply line and at least one discharge line, wherein the supply line supplies liquid at a first temperature into the dishwasher and the discharge line discharges liquid at a second temperature from the dishwasher, wherein the supply line and the discharge line run coaxially in relation to one another, wherein one of the supply line or the discharge line forms an internal line and the other of the supply line or the discharge line forms an external line, wherein the internal line runs along the liquid transportation line and within the external line to form a countercurrent heat exchanger between the internal line and the external line, wherein a continuous intermediate wall is provided between a wall of the internal line and a wall of the external line;
wherein an inner surface of the intermediate wall bears against the internal line at least in a plurality of regions and the inner surface includes a plurality of grooves that form a plurality of flow channels between the intermediate wall and the internal line, wherein each flow channel runs in a direction of extent of the liquid transportation line, wherein each flow channel is fluidly connected to ambient atmosphere.

12. The dishwasher as claimed in claim 11 , wherein each channel is connected to a sensor device in order to detect liquid escaping from the internal line into the channel.

Assignees

• Disch Harald
• Klumpp Philipp
• Heidt Markus
• Litterst Norbert
• Illinois Tool Works

Inventors

• Disch Harald
• Klumpp Philipp
• Heidt Markus
• Litterst Norbert

Classifications

• A47L15/4291 Primary

  Recovery arrangements, e.g. for the recovery of energy or water · CPC title

• A47L15/4212

  Detection of water leaks; Collection of leaked water, e.g. in the casing · CPC title

• A47L15/4217

  Fittings for water supply, e.g. valves or plumbing means to connect to cold or warm water lines, aquastops · CPC title