TWI738025B - Dish washing machine with heat exchangers - Google Patents

Abstract

A dish washing machine including a housing having an interior wash space for washing dishes. The housing has a liquid inlet for adding a liquid to the dish washing machine. At least one spray nozzle sprays the liquid onto dishes positioned within the interior wash space. The machine further includes a heating tank for heating the liquid which is supplied to the at least one spray nozzle for spraying onto the dishes in the interior wash space. At least one heat exchange system is within the housing. The at least one heat exchange system transfers heat from the liquid heated by the heating tank to the liquid added to the dish washing machine from the liquid inlet.

Description

Dishwasher with heat exchanger

The present invention relates generally to the field of dishwashers and in particular to dishwashers with heat exchangers.

Commercial establishments for cooking and/or preparing food usually have a commercial dishwasher for washing dirty dishes. The dishwasher sprays a detergent and water onto the dirty dishes to clean the dishes. The dishwasher can also spray a rinse detergent and water onto the dishes after the dishes have been washed to rinse the dishes and prevent spots on the dishes.

Currently, there are four main types of commercial dishwashers in the world market. Commercial dishwashers include an under-counter dishwasher, a hood or door type dishwasher, a tunnel type dishwasher, and an in-flight dishwasher. The under-counter dishwasher has a small size and low profile and is positioned under a separate workbench with a sink next to the space occupied by the under-counter dishwasher. Hood or door type dishwashers, tunnel type dishwashers, and flying type dishwashers all have a medium to large size and are positioned next to a separate side table with a sink on the table. Under-counter dishwashers, hood-type or door-type dishwashers, and tunnel-type dishwashers usually all use a rack or container with dirty dishes positioned in the machine. The flying-type dishwasher has dishes that are placed directly on an integral conveyor and are washed when the dishes pass therethrough.

A more efficient and environmentally friendly commercial dishwasher is desired.

According to one aspect, the present invention relates to a dishwasher including a housing having an internal washing space for washing dishes. The housing has a liquid inlet for adding a liquid to the dishwasher. At least one nozzle sprays the liquid onto the dishes located in the internal washing space. The machine further comprises a heating tank for heating the liquid, and the liquid is supplied to the at least one nozzle for spraying onto the dishes in the internal washing space. At least one heat exchange system is tied into the housing. The at least one heat exchange system transfers heat from the liquid heated by the heating tank to the liquid added to the dishwasher from the liquid inlet.

Yet another aspect of the present invention provides a dishwasher including a housing having an internal washing space for washing dishes, the internal washing space is surrounded by at least one wall, and the housing has a housing for adding a liquid To a liquid inlet of the dishwasher; at least one rotating nozzle for spraying the liquid onto the dishes positioned in the internal washing space; a heating tank for heating and supplying to the at least one nozzle The liquid sprayed onto the dishes in the internal washing space; at least two heat exchange systems in the shell, which include at least a first heat exchange system and a second heat exchange system, the at least two A heat exchange system transfers heat from the liquid heated by the heating tank to the liquid added to the dishwasher from the liquid inlet; the liquid entering the dishwasher sequentially passes through the liquid inlet, and then to the second A heat exchange system, then to the second heat exchange system and then to the heating tank; the first heat exchange system includes a tube having a first path passing therethrough and a second path passing therethrough; the first The path is located between the liquid inlet and the second heat exchange system; the second path is located between a discharge port of the internal washing space and a liquid outlet of the housing; the second heat exchanger includes the adjacent at least one A fluid path of the wall; and the liquid in the fluid path of the second heat exchanger exchanges heat with the liquid sprayed from the at least one nozzle.

10: dishwasher

12: Internal washing space

14: Pillar

16: Top rotating spray arm/spray arm

18: Rotating spray arm / spray arm at the bottom

20: Supercharger heating tank

22: Upper washing line

24: Lower washing line

26: bottom pool

28: sink

30: Upper pipeline

32: Lower pipeline

34: discharge pipe

36: The first heat exchange system

36a: Reference number/The first heat exchange system

38: The second heat exchange system

38a: Reference number/Second heat exchange system

39: inlet pipe

40: heat exchange tube

40a: heat exchange tube

42: input valve

44: enter the tube

46: Outer tube

48: Hot water exit pipe

50: Flow control device

52: Bypass pipe

52a: Bypass pipe

54: Input side

56: output side

58: outlet pipe

60: The first transfer tube

61: Import

62: wall

64: rear wall

64a: rear wall

66: top wall

66a: top wall

68: compartment

68a: compartment

70: inner side

72: Outlet valve

74: Exit

74a: Exit

76: second transfer tube

One or more embodiments of the present invention are illustrated by way of example and should not be regarded as limited to the specific embodiments depicted in the accompanying drawings, in which the same reference numbers indicate similar elements.

Figure 1 is a front perspective view of a dishwasher according to an embodiment, with walls and a door removed for reference.

Figure 2 is a rear perspective view of a dishwasher according to an embodiment, with walls and a door removed for reference.

Fig. 3 is a close-up rear perspective view of a dishwasher according to an embodiment, illustrating the flow of heat exchange fluid.

Fig. 4 is a front perspective view of a close-up part of a dishwasher according to an embodiment, illustrating the flow of heat exchange fluid.

Figure 5 is a partial rear perspective view of a dishwasher according to an embodiment, illustrating a second heat exchanger.

Figure 6 is a partial front perspective view of a dishwasher according to an embodiment, illustrating fluid spraying and a heat exchanger.

Fig. 7 is a rear perspective view of a second heat exchanger of a dishwasher according to another embodiment.

Fig. 8 is a first front perspective view of a second heat exchanger of a dishwasher according to another embodiment.

Fig. 9 is a second front perspective view of a second heat exchanger of a dishwasher according to another embodiment.

Fig. 10 is a first perspective view of a first heat exchanger of a dishwasher according to another embodiment.

Fig. 11 is a second perspective view of the first heat exchanger of the dishwasher according to another embodiment.

Fig. 12 is a side view of a first heat exchanger of a dishwasher according to another embodiment.

Fig. 13 is a top view of a first heat exchanger of a dishwasher according to another embodiment.

Specific terms will be used in the following description for reference only and will not be restrictive. The term will include the specifically mentioned words, their derivatives and words with similar meanings.

Reference will now be made in detail to the implementations and examples of various aspects and variations of the present invention. Examples of the present invention are illustrated in the accompanying drawings. Although at least two variations of systems, methods, and uses are described, other variations of systems, methods, and uses can include any suitable combination of the systems, methods, and uses described in this article. A combination of all or some of them.

Figures 1 to 6 illustrate an embodiment of a dishwasher 10. The dishwasher 10 includes an internal washing space 12 for receiving dishes for washing the dishes, such as glass containers, dishes, eating and serving utensils, and the like. Although not shown, the internal washing space 12 may include at least one shelf or edge frame known to those skilled in the art for directly holding dishes or holding a tray or rack (holding dishes). In FIGS. 1 to 6, the outer wall of the dishwasher 10 is not shown so that the inside of the dishwasher 10 can be observed. It is contemplated that the dishwasher 10 may include at least one door for selectively accessing the internal washing space 12 of the dishwasher 10 and closing the internal washing space 12 of the dishwasher 10 during use. For example, a door can be connected to a wall to selectively open the dishwasher 10 (e.g., a rotatable door) or a wall (not shown) can slide up along the pillar 14 of the dishwasher 10 to allow access to Dishwasher 10 The inner washing space 12 of the dishwasher slides back down to a position for closing the inner washing space 12 of the dishwasher 10 during use.

In the illustrated example, the internal washing space 12 of the dishwasher 10 includes a top rotating spray arm 16 located at the top of one of the internal washing spaces 12 so as to be positioned above the dishes (and possibly trays or racks), and located At the bottom of one of the internal washing spaces 12 and at one of the bottoms of the dishes (and possibly trays or racks), a rotating spray arm 18 is used to spray water, a washing fluid and/or a washing fluid onto the dishes for cleaning wash dishes. The water in a supercharger heating tank 20 is supplied to the top rotating spray arm 16 and the bottom rotating spray arm 18 to wash and rinse dishes.

The system for supplying water to the internal washing space 12 of the dishwasher 10 via the top rotating spray arm 16 and the bottom rotating spray arm 18 is well known to those skilled in the art and any such system can be used. For example, as stated in US Patent Application No. 15/455536 entitled DISH WASHING MACHINE for supplying water to the interior of the dishwasher 10 via the top rotating spray arm 16 and the bottom rotating spray arm 18 The system of Space 12, the entire content of this application is incorporated herein by reference. Alternatives can also be used. For example, the system can use only one of the top rotating spray arm 16 or the bottom rotating spray arm 18, which arms can be fixed and/or other nozzles (such as fixed nozzles extending from the inner wall) can be used for Spray water on the dishes to clean the dishes.

In the illustrated embodiment, the system works by first preheating the water supplied to the booster heating tank 20. As outlined below, use a heat exchange system to preheat the water. After being heated to a desired temperature in one of the booster heating tanks 20, water is sucked from the booster heating tank 20 by a pump into a pipeline or a pair of pipelines with a separator to guide the water to the top of the rotation An upper pipeline 30 of the spray arm 16 and a lower pipeline 32 leading to the bottom rotating spray arm 18. Both the upper pipeline 30 and the lower pipeline 32 may have a one-way valve on one end to prevent water from returning to That. The heated water from the upper pipeline 30 and the lower pipeline 32 is sprayed through the nozzles in the top rotating spray arm 16 and the bottom rotating spray arm 18, respectively. After leaving the top rotating spray arm 16 and the bottom rotating spray arm 18, the heated water drops to a bottom pool 26 and flows into a washing tank 28 through one of the bottom holes.

In the illustrated example, once enough water is collected in the washing tank 28, the washing process is ready to begin. A washing detergent can be injected into the washing tank 28 to help wash the dishes and heat the water in the washing tank (for example, to about 65° C. or higher). When the washing program is ready to start, the water supply from the booster heating tank 20 to the washing tank 28 via the spray arms 16 and 18 is stopped. It is expected that the washing detergent may be added to the washing tank 28 periodically or continuously during the washing program. After adding the washing detergent to the water in the washing tank 28, a washing pump drives the water in the washing tank 28 to an upper washing line 22 and a lower washing line 24. The upper washing line 22 leads to one of the washing paths in the top rotating spray arm 16 and the lower washing line 24 leads to one of the washing paths in the bottom rotating spray arm 18. Both the upper washing line 22 and the lower washing line 24 may have a one-way valve on one end thereof to prevent water from returning to them. The washing water from the upper washing pipeline 22 and the lower and washing pipes 24 are sprayed through the washing nozzles in the top rotating spray arm 16 and the bottom rotating spray arm 18, respectively. The force of the washing water leaving the washing nozzle drives the top rotating spray arm 16 (for downward spraying) and the bottom rotating spray arm 18 (for upward spraying) to rotate, which is well known to those skilled in the art. Finally, the washing water drops to the bottom tank 26 and flows into the washing tank 28 through the bottom hole therein, wherein the process of pumping the washing water to the top rotating spray arm 16 and the bottom rotating spray arm 18 during the washing cycle occurs continuously. After the illustrated washing cycle is completed, the washing water is removed from the dishwasher 10 through a drain pipe 34 by a drain pump and/or the force of gravity.

In the illustrated example, after the dishes in the dishwasher 10 have been washed, the dishes are rinsed. During the flushing cycle, more pre-heated water is supplied to the booster heating tank 20. once In the booster heating tank 20, water is heated to assist in washing dishes. It is expected that the supercharger heating tank 20 can heat water to about 85°C or higher. It is expected that the system for washing dishes can measure the temperature of the water in the supercharger heating tank 20 before proceeding, or it can heat the water in the supercharger heating tank 20 for a certain period of time before proceeding. During, before, or after the heating of the water in the booster heating tank 20, a washing detergent is injected into the booster heating tank 20 to assist the washing of the dishes. After heating the flushing water and adding the flushing detergent to it, the flushing pump sucks in the flushing water from the booster heating tank 20 and circulates the flushing water through the system several times in the same way as the washing water passes through the system. Even if the pumping of washing water and rinsing water from the washing tank 28 is described as taking place in two steps (that is, pumping washing water from the washing tank 28 and then washing water), it is still expected that the washing of the dishes can occur directly in the washing After the circulation, a mixture of washing water and washing water is pumped from the washing tank 28 to the outlet. In addition, it is expected that not all the washing water and rinse water are discharged from the washing tank 28 after each washing cycle.

The aspect of this embodiment includes a method of preheating water from a water source before it enters the heating tank 20 of the booster. Figures 1 to 6 illustrate a system having a first heat exchange system 36 and a second heat exchange system 38, although it is contemplated that only one of the first heat exchange system 36 or the second heat exchange system 38 can be used. In addition, although the water is shown as being preheated by traveling from the first heat exchange system 36 to the second heat exchange system 38, the path can be reversed so that the water first travels to the second heat exchange system 38 and then travels To the first heat exchange system 36.

In the illustrated example, the first heat exchange system 36 uses waste water from the washing tank 28 to heat the water entering the booster heating tank 20. As illustrated in FIG. 3, water enters the dishwasher 10 through an inlet pipe 39. The inlet pipe 39 terminates at an inlet valve 42 which is selectively actuated to allow water to enter the dishwasher 10. Once the inlet valve 42 is opened, the water is transferred to the first heat exchange system 36 through an inlet pipe 44. The first heat exchange system 36 includes a The water flowing through the tube 44 is a heat exchange tube 40.

In the illustrated embodiment, the hot wastewater also flows through the heat exchange tube 40 to transfer heat from the hot wastewater to the input water. In the illustrated example, the heat exchange tube 40 includes an outer tube 46 having water flowing therethrough from the inlet tube 44. The outer pipe 46 surrounds a hot water exit pipe 48 having hot waste water flowing in a direction opposite to the outer pipe 46. As outlined above, after the washing cycle and the flushing cycle, the discharge pipe 34 connected to the washing tank 28 selectively allows the hot waste water to be emptied from the washing tank 28. The discharge pipe 34 is connected to the hot water exit pipe 48 so that the hot waste water transfers heat to the input water when the waste washing and flushing water passes through the hot water exit pipe 48. Although a coaxial design of the heat exchange tube 40 is illustrated, it is expected that any boundary wall can be used in the heat exchange tube 40, and the input water and hot waste water can exchange heat in the heat exchange tube 40 in any manner. In addition, the heat exchange tube 40 can have any cross-sectional shape (for example, circular, U-shaped, rectangular or any other shape) and the length of the heat exchange tube 40 can be any length (and it preferably resides in the dishwasher 10 Within the same occupied area of the shell).

The illustrated first heat exchange system 36 may allow the input water and/or waste water to be kept within the heat exchange tube 40 or to selectively flow through the heat exchange tube 40. A flow control device 50 is located at one end of the heat exchange tube 40 to control the flow of waste water through the heat exchange tube 40. The flow control device 50 can keep the waste water in the heat exchange tube 40 or pass the waste water through one or more internal sections of the heat exchange tube 40.

In the illustrated example, a bypass pipe 52 may be positioned adjacent to the flow control device 50 and has an input side 54 before the flow control device 50 and an output side 56 after the flow control device 50. The bypass pipe 52 is located above the flow control device 50 to allow excess waste water to pass through the bypass pipe 52 to an exit pipe 58 that allows the waste water to exit the dishwasher 10. When the pressure from the water entering the heat exchange tube 40 is strong enough to overcome the force of gravity and on the input side of the bypass tube 52 When it rises in 54, wastewater can only enter and pass through the bypass pipe 52. However, since the heat exchange tube 40 is at the same elevation as the flow control device 50, the flow control device 50 can be closed to keep the waste water in the heat exchange tube 40. In one embodiment, because the washing tank 28 is higher than the bypass pipe 52, gravity can push the wastewater upward through the input side 54 of the bypass pipe 52. When the waste water in the discharge pipe 34 and the bypass pipe 52 are at the same elevation, the system will reach equilibrium. At that time, the system will be in equilibrium with the waste water still in the heat exchange tube 40. In the equilibrium state, when the flow control device 50 is turned on to allow the waste water to exit to the exit pipe 58, the waste water will only be discharged from the heat exchange pipe 40. The bypass pipe 52 allows subsequent wastewater to flow through the flow control device 50 while a portion of the hot wastewater remains inside the heat exchange pipe 40. The flow control device 50 (and gravity) can be used to keep the hot waste water in the heat exchange tube 40, so as to allow a longer contact time between the hot waste water and the input water to achieve greater heat exchange. The flow control device 50 can be turned on to discharge all the waste water in the heat exchange tube 40 at the end of the day.

In the illustrated example, the input water may also pass through the second heat exchange system 38 to increase the temperature of the input water before the water enters the booster heating tank 20. As shown in FIG. 3, a first transfer pipe 60 extends between the first heat exchange system 36 and the second heat exchange system 38. The first transfer pipe 60 extracts the water from the outer pipe 46 of the heat exchange pipe 40 to one of the inlets 61 of the second heat exchange system 38. The first transfer pipe 60 extends in at least a portion adjacent to one rear side of the housing of the dishwasher 10.

The illustrated second heat exchange system 38 includes at least one wall 62 adjacent to the internal washing space 12 of the dishwasher 10 with water passing therethrough from the first transfer tube 60. In the illustrated embodiment, at least one wall 62 including the second heat exchange system 38 includes a rear wall 64 and a top wall 66. Each of the rear wall 64 and the top wall 66 includes a plurality of compartments or compartments 68 for holding water. When washing water or rinsing water rotates from the top, the spray arm 16 and the bottom rotate When the spray arm 18 is sprayed in the inner washing space 12 of the dishwasher 10, hot wash water or rinse water will be sprayed or splashed onto the inner side 70 of the rear wall 64 and the top wall 66, thereby heating the rear wall 64 and The inner side 70 of the top wall 66. The hot inner side 70 of the rear wall 64 and the top wall 66 will then heat the water in the compartment or compartment 68 of the rear wall 64 and the top wall 66. In addition, the hot air and/or mist inside the inner washing space 12 of the dishwasher 10 also transfers heat to the inner side 70 of the rear wall 64 and the top wall 66, and thereby the compartments or partitions of the rear wall 64 and the top wall 66 Water within 68. It is contemplated that the at least one wall 62 may be made of one or more metal sheets formed and/or welded together to form a compartment or compartment 68 and a boundary wall of the at least one wall 62 to retain water within the at least one wall 62. The second heat exchange system 38 may be an integral part of the dishwasher 10 or may be attached (permanently or removably) to the interior of the dishwasher 10. The second heat exchange system 38 also helps to reduce the external temperature of the dishwasher, because the wall 62 of the dishwasher has a reduced temperature due to the water into which the heat is transferred.

It is contemplated that water may circulate and/or be temporarily stored in the compartment or compartment 68 to heat the water therein. As shown in FIGS. 2 and 5, an outlet valve 72 can be located at an outlet 74 of the second heat exchange system 38 to retain the water in the second heat exchange system 38 for a desired period of time. After the heated water exits the second heat exchange system 38 through the outlet 74, the heated water is transferred to the supercharger heating tank 20 through a second transfer pipe 76.

The reference number 38a (FIGS. 7-9) generally designates another embodiment of the present invention, which has a second embodiment of a second heat exchange system. Since the second embodiment of the second heat exchange system 38a is similar to the second heat exchange system 38 described previously, the similar components shown in FIGS. 1 to 6 and 7 to 9 are respectively given the same corresponding reference numbers Means, except for the suffix "a" in the latter number. The second embodiment of the second heat exchange system 38a includes a compartment or compartment 68a having a serpentine path through either the rear wall 64a and the top wall 66a, thereby allowing a single path through the second heat exchange system 38a. The second embodiment of the second heat exchange system 38a may or may not be present The port 74a has a valve to allow water to pass through the second heat exchange system 38a without being retained by the second heat exchange system 38a.

Reference number 36a (FIGS. 10-13) generally designates another embodiment of the present invention, which has a second embodiment of a first heat exchange system. Since the second embodiment of the first heat exchange system 36a is similar to the first heat exchange system 36a described previously, similar components appearing in FIGS. 1 to 6 and 10 to 13 are respectively given the same corresponding reference numbers Means, except for the suffix "a" in the latter number. As outlined above, the second embodiment of the first heat exchange system 36a does not include the flow control device 50 and the bypass pipe 52a maintains water in the heat exchange pipe 40a.

The dishwasher 10 includes a heat exchanger that allows the heat from the waste water to preheat the water entering the system, thereby saving energy and releasing colder water to the environment compared to what would happen without a heat exchanger. It is expected that the system may not have a booster heating tank and the water heated in the first and/or second middle may be sprayed first through the sprayer and then heated in the washing tank before washing and subsequent washing.

Although the specific preferred embodiments of the present invention have been disclosed in detail for the purpose of illustration. However, it should be recognized that the changes and modifications of the disclosed equipment, including the rearrangement of components, are all within the scope of the present invention. For example, it is expected that only a single rotating spray arm (upper or lower) can be used.

10: dishwasher

12: Internal washing space

14: Pillar

16: Top rotating spray arm/spray arm

18: Rotating spray arm / spray arm at the bottom

20: Supercharger heating tank

26: bottom pool

28: sink

36: The first heat exchange system

38: The second heat exchange system

40: heat exchange tube

62: wall

64: rear wall

66: top wall

68: compartment

70: inner wall

Claims (22)

A dishwasher includes: a housing having an internal washing space for washing dishes, the housing having a liquid inlet for adding a liquid to the dishwasher, and for washing the dishes A liquid outlet of the machine to remove dirty liquid; at least one nozzle for spraying the liquid onto the dishes positioned in the internal washing space; a heating tank for heating the at least one nozzle supplied to the Liquid for spraying onto the dishes in the internal washing space; at least one heat exchange system in the housing, the at least one heat exchange system transferring heat from the liquid heated by the heating tank to the liquid The inlet is added to the liquid of the dishwasher; the at least one heat exchange system includes a first heat exchange system including a tube having a first path therethrough and a second path therethrough; the first path Is located between the liquid inlet and the heating tank; the second path is located between a discharge port of the internal washing space and the liquid outlet of the housing. Such as the dishwasher of claim 1, wherein: the first path and the second path have the same flow axis center. Such as the dishwasher of claim 1, wherein: the first path surrounds the second path. The dishwasher of claim 1, further comprising: a washing tank in the housing for receiving the liquid from the heating tank and supplying the liquid to the at least one nozzle. Such as the dishwasher of claim 1, wherein: the at least one nozzle is a plurality of nozzles on a top rotating arm and a bottom rotating arm. The dishwasher of claim 1, wherein: the at least one heat exchange system further includes a second heat exchange system. The dishwasher of claim 6, wherein: the liquid entering the dishwasher sequentially passes through the liquid inlet, then to the first heat exchange system, then to the second heat exchange system, and then to the heating tank . Such as the dishwasher of claim 6, wherein: the first path is located between the liquid inlet and the second heat exchange system. The dishwasher of claim 6, wherein: the housing includes at least one wall surrounding the internal washing space; the second heat exchange system includes a fluid path adjacent to the at least one wall; and the second heat exchange system The fluid in the fluid path permeates the internal washing The at least one wall of the space exchanges heat with the liquid sprayed from the at least one nozzle. The dishwasher of claim 9, wherein: the at least one wall includes a top wall and a rear wall. The dishwasher of claim 9, wherein: the fluid path passes through the at least one wall. The dishwasher of claim 1, further comprising: a bypass line located between the second path and the liquid outlet of the housing, the bypass line being located at a second path higher than the second path At one of the bypass heights, the bypass pipeline maintains the liquid in the second path by a gravity. The dishwasher of claim 12, further comprising: a flow control member for selectively maintaining liquid in the second path or allowing the liquid to flow to the liquid outlet of the housing, the bypass line Bypassing the flow control member, the flow control member allows the liquid to flow to the liquid outlet without first passing through the bypass pipe when the flow control member is opened. A dishwasher includes: an outer shell having an inner washing space for washing dishes, the inner washing space being surrounded by at least one wall, the outer shell having one for adding a liquid to the dishwasher A liquid inlet, and a liquid outlet for removing dirty liquid from the dishwasher; At least one rotating nozzle for spraying the liquid onto the dishes positioned in the internal washing space; a heating tank for heating the liquid supplied to the at least one rotating nozzle for spraying into the interior On the dishes in the washing space; at least two heat exchange systems in the housing, which include at least a first heat exchange system and a second heat exchange system, and the at least two heat exchange systems will be heated by the The liquid heated by the heating tank is transferred to the liquid added to the dishwasher from the liquid inlet; the liquid entering the dishwasher sequentially passes through the liquid inlet, then to the first heat exchange system, and then to the The second heat exchange system and then to the heating tank; the first heat exchange system includes a tube having a first path passing therethrough and a second path passing therethrough; the first path is located between the liquid inlet and the The second heat exchange system; the second path is located between a discharge port of the internal washing space and the liquid outlet of the housing; the second heat exchange system includes a fluid path adjacent to the at least one wall; And the liquid in the flow path of the second heat exchange system exchanges heat with the liquid sprayed from the at least one rotating nozzle. The dishwasher of claim 14, further comprising: a washing tank in the housing for receiving the liquid from the heating tank and supplying the liquid to the at least one rotating nozzle. Such as the dishwasher of claim 14, where: The at least one rotating nozzle is a plurality of nozzles located on a top rotating arm and a bottom rotating arm. Such as the dishwasher of claim 14, wherein: the first path and the second path have the same flow axis center. Such as the dishwasher of claim 17, wherein: the first path surrounds the second path. For example, the dishwasher of claim 14, further comprising: a bypass line located between the second path and the liquid outlet, the bypass line being located at a height higher than a second path of the second path At the path height, the bypass pipeline maintains the liquid in the second path by a gravity. Such as the dishwasher of claim 19, further comprising: a flow control member for selectively maintaining the liquid in the second path or allowing the liquid to flow to the liquid outlet, the bypass pipe bypassing the A flow control member, when the flow control member is opened, allows the liquid to flow to the liquid outlet without first passing through the bypass pipe. The dishwasher of claim 14, wherein: the at least one wall includes a top wall and a rear wall. A dishwasher includes: a housing having an internal washing space for washing dishes, the housing having a liquid inlet for adding a liquid to the dishwasher; and at least one nozzle for Spraying the liquid onto the dishes positioned in the internal washing space; a heating tank for heating the liquid supplied to the at least one nozzle for spraying onto the dishes in the internal washing space At least one heat exchange system in the housing, the at least one heat exchange system transfers heat from the liquid heated by the heating tank to the liquid added to the dishwasher from the liquid inlet; the housing includes surrounding the interior At least one wall of the washing space; the at least one heat exchange system includes a heat exchanger having a fluid path adjacent to the at least one wall, and the liquid in the fluid path of the heat exchanger permeates the inner washing space The at least one wall exchanges heat with the liquid sprayed from the at least one nozzle.

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