Electromagnetic heating dishwasher

Abstract

The utility model discloses an electromagnetic heating dish-washing machine. The electromagnetic heating dish-washing machine comprises an excitation coil connected with a controller and a cleaning water flow cavity formed by conductor walls. After the magnet exciting coil is electrified, an induction electromagnetic field is generated, so that the conductor wall of the cleaning water flow cavity generates induction eddy current and is rapidly heated, and circulating water in the cavity is heated. The electromagnetic heating water cavity is formed in the dish washing machine, induction eddy current directly acts on conductor walls such as stainless steel, the defects that a traditional heating rod is uneven in heating and low in conduction efficiency are overcome, the heating speed can be remarkably increased, and energy consumption can be remarkably reduced. In addition, the magnet exciting coil is arranged between the upper conductor wall and the lower conductor wall and is matched with the insulation plate and the heat insulation layer for separation protection, and efficient and safe water flow heating can be achieved in the limited space of the machine frame. According to the design, the water temperature can quickly and uniformly rise, and the size and the manufacturing cost of the whole machine can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of commercial kitchen equipment, and particularly relates to a commercial dishwasher using the principle of electromagnetic induction heating to heat washing water. BACKGROUND

[0002] Commercial dishwashers have been widely used in catering, hotels, canteens and other occasions. The existing commercial dishwasher usually heats the washing water by setting an electric heating element inside to complete the cleaning and disinfection of tableware. The commonly used electric heating element at present is a heating rod (usually made by embedding resistance wire or heating wire into a metal tube), which directly heats the water to raise the water temperature by passing electricity.

[0003] However, the heating rod still has the following shortcomings in actual use:

[0004] 1) Due to the limitation of its structure, the contact area between the heating rod and the water is small, which limits the heat transfer efficiency;

[0005] 2) Due to the influence of internal resistance wire distribution and heating rod shape, the water heating area is relatively concentrated, which is prone to uneven heating;

[0006] 3) In order to meet the needs of large flow and high temperature, multiple or high-power heating rods need to be configured, which not only occupies the internal space of the dishwasher, but also increases the energy consumption and operating cost;

[0007] 4) The arrangement of the heating rod needs additional fixing structure and protection device, which not only increases the complexity of the equipment, but also increases the maintenance cost.

[0008] Based on the higher requirements for the heating efficiency and energy consumption of the commercial dishwasher, the traditional heating rod alone cannot meet the actual application requirements. The electromagnetic induction heating technology has been applied in many kitchen equipment due to its fast heating speed, high thermal efficiency and relatively compact structure, but there are still few mature solutions in commercial dishwashers. How to reasonably arrange the induction coil in the limited machine space, improve the heating efficiency, and realize the rapid and uniform improvement of water flow heating, has become a technical problem to be solved. SUMMARY

[0009] In order to overcome the above shortcomings, the present application provides a commercial dishwasher using electromagnetic induction principle to heat washing water efficiently, so as to shorten the washing time, reduce the energy consumption and equipment volume, and also ensure the safety and stability of the washing process.

[0010] The present application aims to overcome the deficiencies of uneven heating, low heat transfer efficiency, large space occupation and high energy consumption of the existing commercial dishwasher which generally uses a heating rod for water heating, and provides an electromagnetic heating dishwasher which uses the principle of electromagnetic induction to quickly, uniformly and efficiently heat the water flow cavity. By setting an excitation coil in the dishwasher, an induced electromagnetic field is generated to produce induced eddy currents in the conductor wall (such as a stainless steel plate), thereby directly heating the water flow cavity and greatly improving the heat exchange area and heat transfer efficiency.

[0011] The electromagnetic heating dishwasher of the present application comprises an excitation coil and a cleaning water flow cavity composed of a conductor wall. When the excitation coil is energized, an induced electromagnetic field is generated to cause the conductor wall of the water flow cavity to produce induced eddy currents and heat up, thereby heating the water inside the cavity. By adopting a split design of the first cavity and the second cavity, the excitation coil is placed in the space between the two cavities and is isolated by the upper and lower insulating plates, which not only effectively prevents the excitation coil from contacting the external conductor structure, but also allows the upper and lower parts of the cavity to be simultaneously affected by the induced field, thereby quickly and uniformly increasing the water temperature.

[0012] Further, the cleaning water flow cavity is set to have a rectangular cross-section and is made of stainless steel material, and strong eddy currents are generated in the area close to the excitation coil, significantly improving the uniformity of water heating and the efficiency of temperature rise. By maintaining a distance of 15-20 mm between the upper and lower heating plates and the excitation coil, the high-efficiency heating effect brought by electromagnetic eddy currents can be fully utilized. In terms of specific material selection, the heating plate is made of 430 stainless steel and the outer shell is made of 304 stainless steel, which not only increases the heat exchange area with the liquid, but also enhances the corrosion resistance and service life of the equipment.

[0013] Compared with the existing heating rod heating method, the present application directly generates eddy currents on a larger area of the conductor wall for heat transfer, avoiding the problems of uneven heating and energy loss caused by the heating rod itself heating up and the limited contact area with water. At the same time, due to the simplified layout of the internal heating elements, the overall structure of the device is more compact, the cleaning water warms up faster and consumes less energy. In summary, the present application not only meets the needs of commercial dishwashers for rapid heating and high-temperature disinfection, but also takes into account energy saving and structural reliability, and has significant technical advantages and application value. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the dishwasher of the present application.

[0015] Figure 2 is a schematic diagram of the structure of the cleaning water flow cavity and the heating coil of the present application.

[0016] Figure 3 is an exploded view of the cleaning water flow cavity of the present application.

[0017] Figure 4 This is a cross-sectional structural diagram of the cleaning water flow cavity described in this invention.

[0018] Figure 5 This is a cross-sectional exploded structural diagram of the cleaning water flow cavity described in this invention. Detailed Implementation

[0019] The following is combined with Figures 1 to 5 The exemplary structure shown further illustrates the electromagnetic heating dishwasher of this embodiment of the invention. It should be understood that the following description is only for illustrative purposes, illustrating the principles, features, and advantages of the invention, and is not intended to limit the scope of protection of the invention. Any technical features or solutions of the invention can be combined or substituted with each other, within the scope of the invention's intent, to achieve more embodiments.

[0020] Overall structure

[0021] See Figure 1 As can be seen, the electromagnetic heating dishwasher described in this embodiment of the invention is installed entirely within a vertical frame 100. The upper part of the frame 100 is the main operating area 101 of the dishwasher, which can accommodate conventional dishwasher components such as the dish rack, spray system, transmission device, and circulating water pipes, for automatic cleaning, rinsing, and disinfection of tableware. The lower space 102 of the frame 100 is used to install the water pump 1021, motor 1022, electrical control components 1023, and the cleaning water flow chamber 110 of this invention.

[0022] In this embodiment, the cleaning water flow chamber 110 is located on the bottom right side of the frame 100. The location of the cleaning water flow chamber is connected to the internal circulating water pipeline and control system of the dishwasher to achieve efficient heating of the cleaning water.

[0023] The main support structure of the dishwasher in this embodiment may include a frame 110, a column 1101 and a guard plate 1102, etc. The upper part 101 inside is the washing area, and the lower part 102 mainly accommodates the water pump, the motor and the cleaning water flow chamber 110 of the present invention.

[0024] The cleaning water flow chamber 110 uses inductive eddy current to heat the water, specifically including:

[0025] The excitation coil 111 is connected to the controller 1111, and the controller 1111 is connected to the power supply 1112 to generate an electromagnetic induction field.

[0026] The upper heating plate 112 and the lower heating plate 113 are made of stainless steel and are used to form an electromagnetic induction heating channel. The upper heating plate and the lower heating plate directly heat the water in the cleaning water flow cavity.

[0027] The housing 114 is made of, for example, SUS304 stainless steel and is used to enclose the internal structure and maintain a seal.

[0028] Insulating plates 115, 116 are arranged on the upper and lower sides of the excitation coil 111 to ensure insulation between the coil and the metal heating plate;

[0029] Other thermal insulation components 117, 118: for example, thermal insulation materials (such as 10 mm thick thermal insulation cotton 1161) filled between the shell and the heating plate to reduce heat loss.

[0030] The electrical and control components further include an electromagnetic heating controller 1111 cooperating with the excitation coil 111, a temperature detection and feedback unit 122, a power module 1112, etc., for converting commercial power into suitable alternating or pulse signals to provide electromagnetic energy for the excitation coil 111, and combining temperature signals to control heating power and time.

[0031] Detailed structure

[0032] As shown in Figure 1 , the rack 100 is a vertical frame structure to accommodate a large washing cavity and a transmission device. The inside of the rack 100 is divided into upper and lower layers by a horizontal partition. The upper layer 101 is a dish washing area containing spray arms, washing baskets, etc. The lower layer 102 houses a water pump 1021, a motor 1022, and a cleaning water flow cavity 110. The cleaning water flow cavity 110 can be fixed at the left or right or middle position of the lower part of the rack 100 according to the space arrangement needs, but in this embodiment, it is arranged at the right side of the rack 100 and connected with the rack 100 through a fixed support. The cleaning water flow cavity 110 is externally a SUS304 stainless steel box shell 114, which can adapt to the higher humidity and corrosive factors such as acid and alkali steam in the kitchen environment.

[0033] As shown in Figure 2 , the cleaning water flow cavity 110 is in the shape of a rectangular parallelepiped. A plurality of mounting legs 1141 are welded or riveted on the shell 114 to fix the water tank 110 to the bottom plate or side column of the rack 100. The front or side of the water tank 110 can be provided with a water inlet 1103 and a water outlet 1104, respectively connected to the pipeline 132 of the water circulation component 130. The surface of the shell 114 is relatively flat and is bent or welded from a certain thickness of stainless steel plate material, which not only ensures the mechanical strength, but also provides good appearance and protection performance.

[0034] As shown in Figure 3 and Figure 4As shown, to better demonstrate the internal structure, the cleaning water flow cavity 110 is partially stretched and disassembled. It can be seen that within the housing 114, the upper heating plate 112, upper insulating plate 115, excitation coil 111, lower insulating plate 116, and lower heating plate 113 are arranged longitudinally. The upper heating plate 112 and lower heating plate 113, together with the housing 114, constitute the conductive walls of the cleaning water flow cavity, namely the first cavity 1141 and the second cavity 1142, forming several spaces 117 and 118 between the plates that internally connect the first cavity 1141 and the second cavity 1142. This upper and lower cavity design allows the excitation coil 111 to be located between the upper heating plate 112 and the lower heating plate 113, enabling simultaneous induction heating of the water flow in both the upper and lower sections.

[0035] In a preferred embodiment, the upper chamber 117 can be connected to the spray system on the upper part of the frame 100 for circulating water to flow back from the washing area to the interior of the cleaning water flow chamber 110 for heating; the lower chamber 118 is connected to the subsequent pipeline 132 to transport the heated water back to the washing area or discharge it to other required areas.

[0036] The excitation coil 111 is centrally located. When energized, it generates a high-frequency or medium-frequency electromagnetic field, causing eddy currents in the upper and lower heating plates 112 and 113 to be induced and rapidly heated. Furthermore, to prevent direct contact between the excitation coil 111 and the upper and lower heating plates 112 and 113, which could lead to short circuits or energy loss, this embodiment includes an upper insulating plate 115 and a lower insulating plate 116 above and below the excitation coil 111, respectively. These two insulating plates 115 and 116 also assist in supporting and fixing the excitation coil 111, ensuring that the coil's relative position remains stable during unit vibration or water flow impact. This arrangement isolates the excitation coil 111 from the conductor walls of the first cavity 1141 and the second cavity 1142, while allowing effective coupling through the electromagnetic field to heat the water.

[0037] like Figure 4 As shown, the shape and layout of the cleaning water flow chamber inside the water tank 110 between the upper heating plate 112 and the lower heating plate 113 can be intuitively understood from the cross-section.

[0038] In a preferred embodiment, the cleaning water flow chamber adopts a rectangular cross-section design to achieve a more efficient eddy current heating effect in the area close to the excitation coil 111. After entering the upper cavity 117, the water flows through a certain guiding structure (not shown in the figure), which can be equipped with guide plates or baffles as needed, to disperse the flow across the surface of the heating plate and fully absorb its heat, before flowing into the lower cavity 118. At this time, the induction zone formed by the upper and lower cavities 117 and 118 and the periphery of the excitation coil 111 has a large coverage area, which can heat the water to the required temperature in a shorter time.

[0039] In a preferred embodiment, the material of the upper heating plate 112 and the lower heating plate 113 can be selected as 430 stainless steel, which can generate strong eddy current in alternating electromagnetic field and has good magnetic conductivity and corrosion resistance. Meanwhile, in order to ensure the structural strength and comprehensive corrosion resistance of the outer shell 114, SUS304 stainless steel is used. The combination of the two materials not only improves the heat conversion efficiency, but also takes into account the overall protection performance; and the 15-20mm gap reserved between the upper and lower heating plates can ensure that the excitation coil 111 is uniformly distributed in the inductive magnetic field between the upper and lower plates, further improving the efficiency and uniformity of water body heating.

[0040] Figure 5 The exploded view of the layered structure of the water tank 110 is shown in more detail, the SUS304 stainless steel shell 114 covers the entire cleaning water flow cavity 110, the surface of the shell 114 can be in contact with the rack 100 and the external environment; the 430 stainless steel upper heating plate 112 can generate strong eddy current heating under high-frequency electromagnetic field, directly in contact with the washing water or indirectly forming the upper water cavity 117; the middle interlayer 1171 can be filled with 10mm thick heat insulation cotton to minimize heat loss to the outside; the insulation plate 115 is made of oak or other high-temperature resistant insulation materials, used to isolate the excitation coil 111 and the upper heating plate 112; the excitation coil 111 is connected with the electromagnetic heating controller 121, and forms an inductive electromagnetic field by energization; the oak lower insulation plate 116 is similar to the upper insulation plate 115, and is also used to isolate the excitation coil 111 and the lower heating plate 113;

[0041] The middle interlayer 1181 is filled with 10mm thick heat insulation cotton again to ensure that the lower heat will not be excessively lost to the rack 100 or the environment; the 430 stainless steel lower heating plate 113 corresponds to the formation of the second cavity 1142, and also has good electromagnetic induction heating efficiency; the SUS304 stainless steel bottom shell 1141 is used as a reinforcing structure at the bottom of the water tank 110 and can also bear part of the weight of the water tank.

[0042] From Figure 4 and 5 It can be seen that the present embodiment adopts a "suspended design" between the upper heating plate 112 and the shell 114 and between the lower heating plate 113 and the shell 114, that is, a gap of air or heat insulation material is left between the two, which not only enhances the heat exchange efficiency, but also avoids direct heat conduction between the heating plate and the shell, thereby further reducing energy loss.

[0043] In a preferred embodiment, a sealing ring or a sealing rubber strip can be added between the above layers as needed to ensure that the water tank 110 still has good leak-proof performance when subjected to high-speed water flow and high temperature.

[0044] The working process of the electromagnetic heating dishwasher is as follows:

[0045] Initialization detection

[0046] The controller 1111 detects the water level sensor integrated in the temperature detection and feedback unit 122 and the temperature sensor.

[0047] If the water level in the cleaning water flow cavity 110 is lower than the set high water level, the water inlet electromagnetic valve is opened, and external water enters the cleaning water flow cavity 110 through the water inlet 1103.

[0048] Heating stage

[0049] When the water level is ≥ the set low water level and the temperature is < the set value, the controller 1111 is powered on, the excitation coil 111 generates an alternating magnetic field, and the upper heating plate 112 and the lower heating plate 113 generate eddy current to heat the water in the water flow cavity 110.

[0050] When the water level reaches the high water level, the water inlet electromagnetic valve is closed; when the temperature is ≥ the set value, the heating is stopped.

[0051] Spraying and circulating

[0052] The water pump 1021 is started for 10 seconds, and the water flows through the separate pipeline circulation water pipeline 132 and the cleaning spray nozzle to inject water into the main water tank.

[0053] After the main water tank water level and temperature meet the standards, the machine is ready for completion.

[0054] Washing program

[0055] After the door magnetic sensor (belonging to the electrical control assembly 1023) detects that the door is closed:

[0056] The water pump 102 is started, and the main water tank water is pumped into the rinse spray arm nozzle through the pipeline 132, sprayed into the dishwashing area 101, and then returned to the main water tank, and the cycle is completed until the program is set.

[0057] After the main water pump is stopped, the water pump 1021 is started, and the hot water in the cleaning water flow cavity 110 is sprayed into the washing chamber through the separate pipeline 132 and the cleaning arm nozzle, and then flows into the main water tank after the cleaning is completed.

[0058] The surface water of the main water tank is discharged through the overflow pipe until the program is completed.

[0059] End stage

[0060] The cleaning water pump is stopped, and one washing cycle is completed.

[0061] Compared with the prior art

[0062] The electromagnetic heating dishwasher of the present application comprises an excitation coil 111 and a cleaning water flow cavity composed of a conductor wall (upper heating plate 112 and lower heating plate 113). The water in the cleaning water flow cavity flows continuously, and after the excitation coil 111 is controlled by the controller 121 to generate a high-frequency driving current, an induced eddy current is generated in the heating plate, which rapidly heats up and directly transfers heat to the water flow in close contact with it, thereby achieving efficient heating and significantly shortening the water temperature rising time.

[0063] The cleaning water flow cavity is divided into two cavities (first cavity 117 and second cavity 118) located on the upper and lower sides of the excitation coil 111, so that the two cavities are simultaneously affected by the electromagnetic field generated by the excitation coil, achieving a bidirectional heating effect, effectively improving the heating speed and significantly shortening the washing preparation time. In addition, the space between the two cavities is used to accommodate the excitation coil 111, and the upper and lower surfaces thereof are provided with insulating plates 115, 116, which are kept in safe insulation and stable spacing with the upper and lower heating plates through appropriate support and fixing structures, avoiding metal short circuit and energy loss, and realizing compact structure and saving internal space.

[0064] In the present application, the two cavities are connected to each other, which is beneficial to the up-down circulation of water flow during heating. At the same time, the cavity walls of the excitation coil and the heating plates are separated by insulating plates 115, 116 and heat insulation cotton 1171, 1181 respectively, ensuring the independence of electrical insulation and heat conduction. This structural layout not only ensures safety, but also makes heating more uniform, avoiding the local uneven heating phenomenon of traditional heating rods, which is beneficial to the thorough cleaning and disinfection of tableware.

[0065] The cleaning water flow cavity is designed in a rectangular or near-rectangular shape, and the spacing between the upper and lower heating plates is uniform, so that a stronger eddy current is generated on the side close to the excitation coil, accelerating the water temperature rising speed and maintaining a stable temperature gradient, improving the overall heating uniformity and efficiency of the commercial dishwasher. The heating plate material is selected to be 430 stainless steel with good magnetic conductivity and corrosion resistance, and the shell 114 is made of SUS304 stainless steel or the same grade material with higher corrosion resistance, which ensures the service life of the dishwasher and reduces maintenance cost.

[0066] The excitation coil 111 is placed between the upper and lower heating plates 112, 113, and the distance is controlled within the range of 15-20 mm, so that the electromagnetic field generated fully covers the surface of the heating plate in the up-down direction, greatly improving the heating efficiency. In addition, the upper and lower heating plates and the shell are designed to be "suspended", i.e. the heat insulation cotton 1171, 1181 is sandwiched or an air gap is left, which significantly reduces the heat loss to the external environment, further optimizing the energy utilization efficiency.

[0067] Through the above-mentioned innovative structure and electromagnetic induction heating technology, the electromagnetic heating dishwasher of the present application is superior to the traditional dishwasher relying on resistance heating rod in overall structure, heat utilization efficiency, service life, space occupation, etc. Not only realizes the advantages of fast heating, energy saving and consumption reduction, but also has the characteristics of convenient maintenance, stable structure, durability, etc., and is especially suitable for wide application in commercial scenes such as catering, hotels, canteens, etc.

[0068] The above is only one specific embodiment of the electromagnetic heating dishwasher of the present application. Those skilled in the art can make various forms of appropriate adjustments to the internal structure of the water tank, material selection, shape and winding method of the excitation coil, type and thickness of the heat insulation layer, size of the rack 100, etc. without departing from the core idea and essential characteristics of the present application. For example, if different grades of stainless steel or other suitable alloy materials for electromagnetic induction are used as the heating plate, similar eddy current heating effect can also be achieved; or more flow guide partitions or multi-loop circulation pipelines are added inside the water tank, so as to further optimize the heating efficiency and hydraulic distribution under specific working conditions. These should all be considered as belonging to the protection scope of the present application.

[0069] The component numbers and naming methods given in the present embodiment are only used for illustration and differentiation, and the component names and arrangement positions can be changed to a certain extent according to the production process or market demand in actual products; as long as the technical features defined in the claims are met, it belongs to the protection scope of the present application. In addition, the washing water temperature range, operating pressure range and control software algorithm, etc. can also be designed flexibly to meet the requirements of different commercial kitchens or industry standards.

[0070] In summary, through the detailed description of Figures 1 to 5 It can be seen from the above that the electromagnetic heating dishwasher of the present application has been innovatively improved in overall structure, material selection and electromagnetic induction heating method, which can effectively improve the heating efficiency of commercial dishwasher, shorten the washing time and reduce the energy consumption, and has the advantages of safety and reliability, easy maintenance, etc. Compared with the traditional dishwasher relying on heating rod, the present application has significant advantages in heat transfer efficiency, service life, space utilization, etc. and is suitable for wide application in large commercial scenes such as catering, hotels, canteens, etc. Through the specific description of the above embodiments, it is shown that it has strong practical value and popularization prospect in actual production and application.

Claims

1. An electromagnetic heating dishwasher, characterized in that, The application relates to a cleaning water flow cavity, which comprises: An excitation coil connected to a controller, used for generating an induced electromagnetic field; The cleaning water flow cavity is composed of a conductor wall, and the inside of the cleaning water flow cavity comprises continuously flowing cleaning water; The conductor wall of the cleaning water flow cavity generates induced eddy current in the induced electromagnetic field, and the water in the cleaning water flow cavity is heated through heat generation.

2. The electromagnetic heating dishwasher according to claim 1, characterized in that The cleaning water flow cavity comprises a first cavity and a second cavity, and the conductor wall of the first cavity and the conductor wall of the second cavity both generate induced eddy current in the induced electromagnetic field.

3. The electromagnetic heating dishwasher according to claim 2, characterized in that The first cavity is arranged above the excitation coil, and the second cavity is arranged below the excitation coil.

4. The electromagnetic heating dishwasher according to claim 3, characterized in that The space for accommodating the excitation coil is formed between the first cavity and the second cavity.

5. The electromagnetic heating dishwasher according to claim 4, characterized in that The upper surface of the excitation coil comprises an upper insulating plate arranged at the bottom of the first cavity, and the lower surface of the excitation coil comprises a lower insulating plate arranged at the upper portion of the second cavity.

6. The electromagnetic heating dishwasher according to claim 4, characterized in that The first cavity and the second cavity are communicated with each other, and the cavity wall of the excitation coil is not in contact with other walls constituting the first cavity and the second cavity.

7. The electromagnetic heating dishwasher according to claim 6, characterized in that The conductor wall of the cleaning water flow cavity is made of stainless steel material.

8. The electromagnetic heating dishwasher according to claim 1, characterized in that The cleaning water flow cavity has a rectangular cross section, and the side of the rectangular cross section close to the excitation coil generates induced eddy current in the induced electromagnetic field and generates heat, so as to heat the water in the cleaning water flow cavity.

Images