DE102007025245A1 - Tank content e.g. cleaning fluid, heating device for use in e.g. dishwasher, has microwave source providing microwave input for heating tank content stored in tank of flow dishwasher, where source is formed as vacuum drift tube - Google Patents

Abstract

The device has a microwave source (27), which provides a microwave input (30) for heating tank content such as cleaning fluid (7), stored in a tank (9) of a cleaning device such as flow dishwasher (1). A wall limiting the microwave source is arranged in a base or into the tank. The source has a hollow space provided in a hollow conductor extending into the content. The source is formed as a vacuum drift tube, which generates vibrations within the microwave range of about 0.3 to 300 gigahertz.

Description

State of technology

Out EP 1 196 650 B1 and from DE 106 08 036 C5 conveyors for multi-tank dishwashers are known in which the material to be cleaned is applied to a conveyor belt, transported by a plurality of treatment zones having dishwasher. Depending on the design and embodiment of the continuous dishwasher cleaning fluid temperatures in the order of about 65 ° C are needed in at least one cleaning zone, in a subsequent to the at least one cleaning zone Pumpenklarspülzone or Frischwasserklarspülzone temperatures of the order of 80 ° C are needed to the previously cleaned Clear cleaning material and remove adhering cleaning fluid residues and residues from it. After passage of the rinse zone downstream of the at least one cleaning zone, be it a fresh water rinsing zone, be it a pump rinsing zone, the cleaned material passes through at least one drying zone before it can be removed at the outlet region of a conveying device which is generally provided as an endless conveyor belt.

DE 10 2005 023 428 A1 discloses a commercial single-compartment dishwasher in which, after the final rinse via a blower, an air flow is generated in the rinsing chamber. DE 100 22 088 A1 discloses a program-controlled dishwasher and a device for drying dishes. The dishes are heated in the water-bearing rinses with circulating warm rinsing liquid in the rinsing, and in the program step drying is carried out with pumped rinsing liquid by means of a heat exchanger, a condensation of moisture in the washing. DE 10 2005 012 114 A1 shows a dishwasher with a drying device. In order to improve the drying process of a dishwashing machine, a first heat exchanger and a second heat exchanger are assigned to the dishwasher. The ers th heat exchanger is associated with a flow channel having a heater with a fan, wherein the second heat exchanger is arranged on at least one side wall of the washing compartment.

Out DE 198 31 950 C2 is a machine for cleaning and disinfecting care utensils known. DE 198 38 180 C2 discloses a method and apparatus for cleaning and disinfecting vessels. After continuous cleaning and disinfecting of the vessel by circulation and spraying with a cleaning and disinfecting liquid contained in a rinsing chamber, hot steam is introduced into the rinsing chamber, wherein humid air is sucked out of the rinsing chamber when introducing the heating steam by means of a water jet pump or an electrically driven pump. The disinfection step is carried out with steam.

All cleaning machines described above, be it continuous dishwashers, be it a cleaning chamber having program machines, be it cleaning and disinfecting machines for containers, as used for example in the care sector, have in common that heating of the required cleaning process in the various process steps or rinse water or Superheated steam through boiler, electrical heating elements or the like. This means that in the above-outlined cleaning machines, be it continuous dishwashers, be it single-chamber machines, cleaning machines for cleaning and disinfecting dishes and waste containers, enormous heating capacities are required, the heating installations on the order of several kWs required do. The installed heating capacities have a great influence on the operating costs of such cleaning and disinfecting machines. The lower the installed heating power can be maintained and the lower the consumption of cleaning fluid, chemical additives to the cleaning fluid, such as rinse aid, or heated and heated fresh water, the cheaper the operating costs of such cleaning or disinfecting machine designed for the user. In previously given automatic dishwashers, whether it be continuous dishwashers, be it single-chamber machines, as well as in cleaning and disinfecting machines that are used in the care sector, hot water is heated to the order of about 80 ° C and 85 ° C and then introduced to the process. For safety reasons, however, the boilers generally used for this purpose take up a larger volume of water than what is finally needed in the disinfection step in washer-disinfectors or in the final-rinse step on through-dishwashers or single-chamber automatic machines. This means that the boilers heat a larger supply of water than the one that is ultimately needed in the treatment step or in the process step. However, for reasons of safety so far required heating of a subsequently unnecessary in the subsequent process step water supply to a temperature level in the order of 80 ° C or 85 ° C represents a significant energy savings potential, which is the operating costs of the above dishwashers, be it Continuous dishwashers or single-chamber automatic dishwashers or even in hospitals and nursing homes set up cleaning and disinfection machines, highly favorably influenced.

EP 1 327 844 A2 refers to a method and apparatus for treating a coating material on a substrate and / or a substrate. With the proposed method, coating materials and / or substrates can be cured, crosslinked and / or dried. For this purpose, a microwave oven is used, which generates microwaves at least two mutually different wavelengths.

Disclosure of the invention

Of the present invention is based on the object cleaning machines, be it through-flow dishwashers, Run dishwashers, Single-chamber dishwashers, Single-chamber automatic programmers and washer-disinfectors, so improve and develop their energy balance is improved.

According to the invention this Task solved by that at least one vacuum runtime tube, which Also referred to as magnetron, for vibration generation in Microwave range from 0.3 to 300 GHz used as a heater becomes. The achievable performance of the invention proposed and inexpensive to be manufactured high frequency generator is of the order of a few kW. This applies to the so-called continuous wave operation; in impulse mode can selectively far higher Heat outputs can be achieved.

The proposed according to the invention Vacuum drift tube, which is also referred to as a magnetron, comprises a cylindrical hot cathode (Oxide or storage cathode) in the center. The cathode is of one essentially cylindrical formed anode block, which is preferably made of copper is enclosed. cooling fins allow at the anode block the cooling and a free convection. Located on the inside of the Ano denblockes cavity resonators. These are radial, for Heating wire parallel slits, which are in the direction of the central bore of the anode block, the so-called interaction space, open are. The cavity resonators can furthermore as hole resonators, segment resonators or multi-frequency resonators be educated. The vacuum runtime tube (magnetron) needed for Function an axially extending magnetic field, which usually is generated with permanent magnets. One of the cavity resonators is connected to a coupling loop or to a waveguide and serves the power consumption.

in the Magnetron interaction space act both electrical and magnetic Fields at the same time. The magnetic field lines run parallel to the Cathode axis and enforce the interaction space. Is tension between anode and cathode are due to the electrical Field electrons accelerated towards the anode. The electric field However, with the magnetic field forms a right angle, therefore the electrons due to the Lorenz force from their radial path spirally distracted. Because of this, they move in the interaction space around the cathode. Only comes from a fairly high anode voltage it to the current flow.

The Slits in the magnetron form a ring-shaped closed delay line. Electromagnetic oscillations in one of the cavity resonators spread over the interaction space and the slots in the other cavity resonators out. This creates a ring-shaped Closed multipole electromagnetic resonant circuit. In this AC voltages occur between the ends of the anode segments and also alternating currents on the inner surfaces the slot walls on. The high frequency field in this ring resonator occurs with the Electrons interact. The resulting fields influence Path and speed of the electrons. The consequence of this is that the electrons are braked or accelerated and thereby while their circulation areas higher and form low electron density.

With Help the magnetron microwaves are generated, for example with a frequency range around 2.455 GHz. The effect of a Radiation of microwaves on a good or a fluid achievable is, i. for example, the effect of water heating is not based on the Resonance of the water molecules. Water has its lowest resonance frequency in the liquid state only at 22.23508 GHz. The penetration depth of microwaves with water at a frequency of 2.455 GHz is in the range of a few cm.

Following the solution proposed by the invention, one or more vacuum runtime tubes (magnetrons) are installed on the provided in a continuous dishwasher at least one tank to heat the stockpiled in the tank fluid supply, be it cleaning fluid, be it rinse water or the like. Thus, previously used boilers, which usually have a heating coil or the like, on the efficiency technically much more effective vacuum runtime tube in the continuous wave mode, that are continuously heated. The associated Energy costs are much cheaper due to the improved efficiency of the vacuum runtime tubes proposed as proposed by the invention. The proposed solution according to the invention can be except in the cleaning or fresh water supply-stocking tanks of a continuous dishwasher in the water tank of a single-chamber cleaning machine or a programmer or even a washer-disinfector, which is preferably used in hospitals or in the care sector, realize. By inventively proposed heating of the cleaning fluid via at least one vacuum runtime tube (magnetron), a much more favorable energy balance of a cleaning machine can be achieved.

One Another advantage of the direct heating of the cleaning fluid Microwaves is that there are no locally very hot surfaces like on conventional radiators gives. Very often these conventional radiators are stored Pollution. These burn due to the high surface temperature fixed, resulting in destruction the radiator to lead can.

One Another advantage of using the microwave heating in the steam generator This is because only the amount of liquid is heated that needs to be used as steam becomes. Conventional radiators require that they are always completely covered with liquid, and have a relatively large Dead volume (higher Power consumption).

Short description the drawings

Based In the drawings, the invention will be described in more detail below.

It shows:

1 a partial view of a washing machine designed as a continuous-flow dishwasher,

2 a schematic representation of a single-chamber cleaning machine,

3 a schematic representation of a cleaning and disinfecting machine used in the care sector,

4 a schematic representation of the connection of several vacuum runtime tubes, with cooling fan for heating a tank contents and

5 a plan view of a tank of a cleaning machine in a broken view with a number of waveguides and their courses in the tank.

embodiments

The representation according to 1 the partial view of a trained as a continuous dishwasher cleaning machine can be seen.

1 shows that a continuous dishwasher 1 a conveyor designed as an endless conveyor belt, for example 3 includes, what to be cleaned Good in the transport direction 2 through different treatment zones of the continuous dishwasher 1 promoted. The continuous dishwasher 1 as shown in 1 includes at least one rinse zone 4 in which a first flushing system 5 and a second flushing system 6 are arranged. About the first flushing system 5 Cleaning fluid from the top of the on the conveyor 3 recorded items applied; with the second flushing system 6 is the good to be cleaned, which in the transport direction 2 through the conveyor 3 is transported, applied from below with cleaning fluid. The cleaning fluid 7 is in a rinse tank 9 stored and from this by a first pump 8th to the first flushing system 5 or to the second flushing system 6 promoted. The first pump 8th includes a pump housing 10 ; the rinse tank 9 is through a tank cover strainer 11 covered. The in the rinse tank 9 stocked cleaning fluid is through a partition wall 12 from the tank of a pump rinsing zone 14 and a fresh water rinse zone 18 separated. In the 1 shown rinse zone 4 is over a curtain 13 from the in transport direction 2 behind the rinsing zone 4 lying pump rinsing zone 14 separated. The pump rinsing zone 14 is another, second pump 15 assigned, via which a first spray pipe 16 or a second spray tube 17 In a tank stocked water can be abandoned and the good to be cleaned by this from the spray pipes 16 and 17 exiting rinse water is cleaned, this in a fresh water rinsing zone 18 again over up to a temperature of about 85 ° C heated fresh water is rinsed again.

The fresh water jets inside the freshwater rinsing zone 18 are applied to the material to be cleaned, are by reference numerals 22 indicated.

In transport direction 2 Seen, is behind a heat recovery device 13 with exhaust fan 24 the drying zone 25 who is a fan 26 includes.

The representation according to 1 In addition, it can be seen that in the rinse tank 9 stored cleaning fluid over at least one heater 27 which is a vacuum term tube (magnetron) is, is heated. Through the at least one vacuum runtime tube 24 Microwaves are in the Spülzenteank 9 stored tank contents 28 coupled. The fluid level of the tank contents 28 of the rinse tank 9 is by reference numerals 29 indicated. About the preferred designed as a magnetron heater 27 placed in either the side walls of the rinse tank 9 or in the bottom can be embedded, microwaves are in the tank contents 28 of the rinse tank 9 coupled, so that the water is heated. If a temperature in the order of 60 ° C to 70 ° C, preferably 65 ° C is required in Spülzentank, heating of the tank contents of the tank below the pump rinsing zone 14 or the fresh water rinsing zone 18 to even higher temperatures, for example to a temperature level between 70 ° C and 90 ° C, preferably at 85 ° C.

The representation according to 2 is to be taken from a single-chamber dishwasher.

From the illustration according to 2 is a schematic representation of a single-chamber dishwasher 31 forth, in the good to be cleaned 32 is cleaned. On a chamber roof 43 the single-compartment dishwasher 31 is a rotatable wash arm 33 attached, via the nozzles cleaning fluid to the recorded in the chamber, to be cleaned Good 32 is applied. In the lower part of the single-compartment dishwasher 31 there is a tank 34 , The chamber of the single-chamber dishwasher 31 is via a hinged door 35 accessible. That in the tank 34 recorded cleaning fluid is circulated by means of a circulation pump, not shown, and on the chamber roof 43 the single-compartment dishwasher 31 rotatably arranged wash arm 33 on the good to be cleaned 32 applied. The Lau genpumpe 36 promotes heavily contaminated cleaning fluid from the tank 34 over a siphon 37 into a process. In the upper area of the chamber of the single-chamber dishwasher 31 is a fan 38 arranged, which has an exhaust duct 39 acted upon by the humid air from the chamber of the single-chamber dishwasher 31 is removed during drying. In the lower part of the single-compartment dishwasher 31 runs a supply air line 40 located below the hinged door 35 into the chamber of the single-compartment dishwasher 31 empties. The supply air line 40 is a filter 41 upstream.

The chamber of the single-chamber dishwasher 31 is through chamber walls 42 and the already mentioned chamber roof 43 limited, where the wash arm 33 is received rotatably.

From the illustration according to 2 it turns out that in the tank 34 the single-compartment dishwasher 31 at least one heating device 27 in the form of a vacuum runtime tube (magnetron) is added. About this is the tank contents 28 of the tank 34 with a microwave entry 30 applied. The fluid level in the tank 34 stocked liquid is by reference numerals 29 indicated. How out 2 shows that is the at least one heater 27 in the form of a vacuum runtime tube (magnetron) below the pivotable about an axis perpendicular to the plane axis 35 arranged. Instead of this installation position can also be various other mounting positions for as a vacuum runtime tube 24 provided heating device can be selected. Instead of in 2 shown, one the tank contents 28 of the tank 34 heating heating device 27 in the form of a vacuum runtime tube can also be several such heaters in the tank 34 be built to its tank contents 28 to heat accordingly.

Will the designed as a vacuum runtime tube heater 27 operated in the continuous operating mode, some kW of heating power in the tank contents 28 of the tank 34 be coupled. Due to the efficiency of up to 80%, the heater, which is designed as a vacuum runtime tube (magnetron) 27 an extremely efficient heating device.

The representation according to 3 is a schematic reproduction of a washer-disinfector, as used in hospitals and nursing homes or the like.

3 shows that the washer-disinfector 51 a chamber 52 Includes, over a hinged door 56 is accessible. From the chamber 52 from a process extends 53 that of a siphon bow 54 is limited. In the chamber 52 there is at least one nozzle 55 , via the cleaning fluid and / or superheated steam for disinfection of the in the chamber 52 exits to be cleaned and disinfected items. The chamber 52 On the one hand has an air supply line 58 , about the supply air at a mouth 59 in the interior of the chamber 52 of the washer-disinfector 51 entry; On the other hand, the board has 52 via an exhaust pipe 57 , over which moist air, if necessary with the interposition of a check valve - as in 3 indicated - in the process 53 is initiated. The exhaust air is behind one in the drain 53 stocked liquid supply is introduced, which serves as a barrier, allowing the out of the chamber 52 Removed exhaust air, which is usually moist air, not re-enter the chamber due to the liquid reservoir serving as a barrier 52 flowing back. At the roof of the chamber 52 relationship wise on the boundary walls of the chamber 52 There are a number of nozzles 55 , about either cleaning fluid on the in the chamber 52 stockpiled to be cleaned vessels or superheated steam for their disinfection in the interior of the chamber 52 can be directed.

In the upper part of the illustration according to 3 is a water / steam unit 62 shown. The water / steam unit 62 includes an inlet 60 , over which either depending on the on-site possibilities cold water or hot water of the water / steam unit 62 that a pump 61 includes, inflows. The cold or hot water is in a pot 63 collected. The pot 63 is from a ground 65 limited. The pot 63 puts a water tank 66 showing the water level in the water tank 66 by reference numerals 67 is identified. Separated from the water tank 66 through a partition 70 , includes the water / steam unit 62 a steam generator 68 , The steam generator 68 acts on the with reference numerals 73 identified line 73 , About the steam line 73 During the disinfection step, steam is sprayed over the spray nozzles 55 into the interior of the cleaning chamber 52 registered, so that in this recorded objects can be disinfected.

For heating the according to the water level 69 in the steam generator 68 stocked tank contents serves a heating device 27 , which is designed as a vacuum runtime tube (magnetron) and in the tank contents according to the water level 69 in the steam generator 68 microwave 30 couples. About the microwaves 30 will that be in the steam generator 68 Stored liquid volume heated until it is vaporized via the feed line 73 in the chamber 52 inflows as needed.

About the line 73 can also by the pump 61 pumped water to the spray nozzles 55 be passed over which it in the cleaning chamber 52 for example, can be sprayed in a first rough pre-cleaning step.

For security reasons, there is an overflow 74 provided, which is the water / steam unit 62 with the cleaning chamber 52 connects to an overflow of the water / steam unit 62 to prevent, for example at terminals of the inlet valve.

As shown in the illustration 3 is removed, the heating of the water supply, which is at the steam generator 68 the water / steam unit 62 stockpiled, for example on the ground 65 of the steam generator 68 provided vacuum runtime tube 27 (Magnetron). About these are microwaves 30 in the steam generator 38 stocked stored water supply and this heated accordingly. The frequency with which the vacuum runtime tube 27 microwave 30 in the steam generator 68 is in the order of about 2.455 GHz.

The heater 27 has an efficiency of up to 80% and thus represents a very inexpensive and efficient high-frequency generator, through which the microwaves 30 in the steam generator 38 stocked liquid supply can be coupled. This heats up accordingly until reaching the evaporation temperature.

The representation according to 4 an arrangement of vacuum runtime tubes (magnetrons) for heating a tank contents of a storage tank is shown.

As shown in the illustration 4 indicates a rinse tank is 9 , for example, in the representation according to 1 the rinsing zone 4 associated rinse tank 9 , by a number of vacuum runtime tubes (magnetrons) 27 heated. In the rinse tank 9 is the tank contents 28 up to a fluid level 29 , In the tank contents 28 of the rinse tank 9 protrude in the representation according to 4 at least three waveguides 81 into it. The waveguides 81 enclose a cross section 82 ,

In the tank bottom 87 of the rinse tank 9 passing through several tank walls 86 and the tank bottom 87 is limited, there are several fan ducts 83 , The fan ducts 83 each include a by reference numerals 80 indicated fan, via which the heaters in the form of vacuum runtime tubes 27 (Magnetrons) given if each can be cooled. The heaters 27 each comprise an anode 89 which in the cross section 82 the waveguide 81 protrudes. Through the anode 89 the microwaves are in the cross section 82 the waveguide 81 coupled and occur after passing through the waveguide 81 into the interior of the rinse tank 9 and heat up its tank contents 28 , By reference 84 are openings of the respective waveguide 81 indicated.

How out 4 further, the waveguides are 81 at the tank bottom 87 of the rinse tank 9 attached for example. It is also possible to use the waveguides 81 with her in the tank contents 28 extending part on side walls 86 containing the rinse tank 9 limit, attach laterally. The rinse tank 9 as shown in 4 resting on a machine frame; below the tank bottom 87 of the rinse tank 9 the waveguides extend 81 , in the side of the fan duct 83 of the cooling fan 80 empties. The fan duct 83 passing through and into the flow cross-section 82 of the waveguide 81 protruding, extending from the vacuum runtime tube 27 the anode 89 , above the microwaves 30 in the cross section 82 of the waveguide 81 be coupled. These run - if necessary after making appropriate deflections - through the cross section 82 the waveguide 81 and heat the cleaning fluid stored in the rinse tank.

The representation according to 5 is the top view of a tank walls limited, a tank-holding stocking tank of a cleaning machine.

The representation according to 5 shows the top view of a tank bottom 87 a rinse tank 9 , as shown in the illustration 1 indicated. In the lower, separated by a fracture line area of Spülzonentankes 9 this is the rinse tank 9 limiting tank wall 86 of a number in the tank contents 28 protruding waveguides 81 interspersed. About these waveguides 81 are the preferred in the vacuum runtime tube 27 (Magnetron) generated microwaves in the tank contents 28 of the rinse tank 9 coupled. The microwave entry is shown in the illustration 5 by reference numerals 30 indicated. Analogous to the representation according to 4 in which a side view of a rinse tank 9 For example, a continuous dishwashing machine can be seen, the waveguide 81 laterally via fan ducts 83 be charged. About the blower 80 can cool air to the procured as vacuum runtime magnetron 27 be directed.

From the area of the rinse tank shown separated by the break line 9 it turns out that on the tank bottom 87 through the tank walls 86 limited rinse tank 9 waveguide 81 are laid. The waveguides 81 are according to the spatial conditions via flange connections 88 connected with each other. The waveguides become the microwaves 30 in the tank contents 28 in the rinse tank 9 stored, for example, coupled.

The waveguides 81 each have a cross section 82 on and are bounded by side walls, sections of which 85 serve as diverters to the microwaves 30 preferably to deflect at right angles. Instead of in 5 illustrated course of the waveguide 81 on the tank bottom 87 of the rinse tank 9 You can also choose a different course. In particular, the microwave entries 30 by several, preferably as vacuum runtime tubes 27 provided heaters in the tank contents 28 be coupled.

The in the representation according to the 4 and 5 reproduced, preferably as vacuum runtime tubes 27 provided heaters can the respective tanks 9 . 34 and the water / steam unit 62 , in the 3 is shown, each assigned so that the largest possible penetration depth of the microwaves 30 in each stored liquid supply or tank contents 28 can be done. Depending on the available space, a variety of heating devices designed as magnetrons 27 assigned to the respective tanks. Their tank contents 28 Depending on the selected frequency and number of tanks respectively assigned heaters 27 be heated to temperatures in the range between 60 and 70 ° C or with respect to the fresh water rinse to temperatures of the order of about 85 ° C.

1

Pass-through dishwasher

2

transport direction

3

Conveyor

4

rinse zone

5

first flushing system

6

second flushing system

7

cleaning fluid

8th

first pump

9

Spülzonentank

10

pump housing

11

Tank strainer

12

partition wall

13

curtain

14

pump-action

15

second pump

16

first lance

17

second lance

18

clean-water

19

Sprührohrverlauf

20

upper lance

21

lower lance

22

Fresh water jet

23

Heat recovery

24

exhaust fan

25

drying zone

26

fan

27

heater (Vacuum-

Runtime tube = magnetron)

28

tank capacity

29

fluid level

30

microwave entry

31

Single-chamber cleaning machine

32

to cleansing good

33

wash arm

34

tank

35

door

36

Drain pump

37

siphon

38

Blower (exhaust air)

39

exhaust duct

40

air supply

41

filter

42

chamber wall

43

chamber roof

51

cleaning and disinfectants

device

52

chamber

53

procedure

54

siphon trap

55

spray nozzle

56

door

57

exhaust duct

58

air supply

59

Mouth of supply air line in Kam

mer 52

60

Cold water / hot water supply

61

pump

62

Water / steam unit

63

pot

64

opening

65

ground

66

water tank

67

water level in the water tank

ter 66

68

steam generator

69

water level in the water tank

ter 66

70

partition wall

71

overflow

73

management

74

Safety overflow

80

fan

81

waveguide

82

cross-section

83

fan duct

85

deflecting

86

tank wall

87

tank bottom

88

flange

89

anode

Claims (12)

Device for heating a tank contents ( 28 ) of a tank ( 9 . 34 . 66 ), in particular a continuous-flow dishwasher ( 1 ), or a single-chamber cleaning machine ( 31 ) or a washer-disinfector ( 51 ) equipped with one or more tanks ( 9 . 34 . 66 ) for liquids used in the cleaning process, characterized in that in the tanks / tanks ( 9 . 34 . 66 ) stored liquid supply by a microwave entry ( 30 ) at least one microwave source ( 27 ) is heated. Device according to claim 1, characterized in that the at least one microwave source ( 27 ) in the ground ( 87 ) or in the tank ( 9 . 34 . 66 ) delimiting walls ( 42 . 86 . 65 ) is arranged. Device according to claim 1, characterized in that the microwave source ( 27 ) into the tank contents ( 28 ) extending waveguide ( 81 ). Device according to claim 1, characterized in that the at least one microwave source ( 27 ) a waveguide ( 81 ) whose wall is used as a deflection section ( 85 ) for the tank contents ( 28 ) microwaves ( 30 ) serves. Device according to claim 1, characterized in that the waveguides ( 81 ) via a fan duct ( 83 ) are subjected to a blower ( 80 ) assigned. Device according to claim 1, characterized in that the at least one microwave source ( 27 ) is designed as a vacuum runtime tube that generates oscillations in the microwave range of about 0.3 to 300 GHz. Device according to claim 1, characterized in that the at least one microwave source ( 27 ) is designed as a magnetron. Device according to claim 1, characterized in that the at least one microwave source ( 27 ) in a Tankabdecksieb ( 11 ), a chamber roof ( 43 ), a chamber wall ( 42 ), a tank bottom ( 87 ), a tank wall ( 86 ), a hinged door ( 35 ) is arranged. Device according to a or more of the preceding claims, characterized that the at least one microwave source is continuously working Operating mode is operated. Device according to one or more of the preceding claims, characterized in that via the at least one microwave source ( 27 ) the tank contents ( 28 ) is exposed to a high frequency field. Device according to a or more of the preceding claims, characterized that the process fluid in the tank is heated to evaporation. Device for heating a tank contents ( 28 ) of a tank ( 68 ), in particular a continuous-flow dishwasher ( 1 ), or a single-chamber cleaning machine ( 31 ) or a washer-disinfector ( 51 ) equipped with one or more tanks ( 68 ) for liquids used in the cleaning process, characterized in that in the tanks / tanks ( 68 ) stored liquid supply by a microwave entry ( 30 ) at least one microwave source ( 27 ) is heated to the extent that the liquid ver is steamed.