Dish washing machine with waste heat recovery device

Abstract

The utility model discloses a dish-washing machine with a waste heat recovery device, which comprises a main washing water tank and the waste heat recovery device, the main washing water tank overflows waste hot water into the waste heat recovery device through a horizontal overflow pipe, and the waste heat recovery device comprises a waste heat water tank, a heat exchange pipe and a vertical overflow pipe, tap water in the heat exchange pipe exchanges heat with waste hot water to output warm water, and the heat exchange pipe comprises at least two coil pipe assemblies which are sequentially connected in series and spirally coiled in the waste hot water tank. The heat exchange pipe is designed to comprise at least two coil pipe assemblies which are sequentially connected in series and are spirally coiled in the waste hot water tank, so that the total surface area and the internal water volume of the heat exchange pipe are remarkably increased, the heat exchange efficiency is improved, tap water with more volumes can be in contact with waste hot water for a longer time when flowing through the heat exchange pipe, and the heat exchange efficiency is improved. And more heat is absorbed.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a dishwasher with a waste heat recovery device. Background Art

[0002] Dishwashers wash dishes in an automated way, which not only saves labor but also provides a more hygienic cleaning effect. The workflow of a dishwasher mainly includes two stages: main wash and rinse. The main wash stage uses high-pressure circulating water to effectively clean food residues and oil stains on the dishes, while the rinse stage uses high-temperature purified water to perform the final cleaning and disinfection of the dishes.

[0003] During the rinsing process of the dishwasher, after the tap water enters the rinse water tank, it is heated by a relatively low-power heating tube, quickly raising the water temperature to above 82°C, and the rinse pump pumps out the high-temperature water and sprays it on the surface of the tableware through the spray arm. After washing the tableware, the high-temperature rinse water falls back into the main wash water tank, increasing the volume of the circulating water in the main wash water tank. The water in the main wash water tank is pumped out by a high-flow and high-lift main wash pump, and sprayed on the surface of the tableware again through the main wash spray arm to rinse and clean the residue and oil stains on the tableware. The cleaned water flows back to the main wash water tank for recycling.

[0004] However, each rinsing process will introduce new high-temperature water into the main wash water tank, and the circulating water in the main wash water tank will eventually be discharged through the overflow pipe to become waste hot water. Considering the needs of energy conservation and environmental protection, the heat in the waste hot water is regarded as an important resource that can be recycled. In the prior art, a spiral coil is provided in the waste hot water heat recovery device to transfer the heat of the waste hot water to the normal temperature tap water in the rinse water tank that is about to enter the dishwasher, thereby increasing its temperature and reducing the energy required for subsequent heating of the rinse water tank. However, the existing heat recovery device has the problem of insufficient heat exchange capacity. The main reason is that the spiral coil is only arranged around the inner wall of the waste hot water tank once, and the heat in the waste hot water cannot be fully utilized. Therefore, improvements are needed. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a low-energy-consumption dishwasher with a waste heat recovery device.

[0006] The technical solution of the utility model provides a dishwasher with a waste heat recovery device, comprising a main wash water tank and a waste heat recovery device, wherein the main wash water tank overflows waste hot water into the waste heat recovery device through a horizontal overflow pipe, the waste heat recovery device comprises a waste hot water tank, a heat exchange pipe and a vertical overflow pipe arranged in the waste hot water tank, the tap water in the heat exchange pipe exchanges heat with the waste hot water to output warm water, the openings at the top of the main wash water tank and the waste hot water tank are both connected to the bottom wall of the dishwasher sink, a filter screen is arranged at the top of the opening of the main wash water tank, the water in the dishwasher sink enters the main wash water tank through the filter screen, the opening of the waste hot water tank is sealed, and the heat exchange pipe comprises at least two coil assemblies connected in series in sequence and the spiral coil is arranged in the waste hot water tank.

[0007] Furthermore, the heat exchange tube includes a first coil, a second coil and a third coil connected in series in sequence, the first coil is spirally arranged on the outer periphery of the vertical overflow pipe, the third coil is spirally arranged on the outer periphery of the first coil, the first coil is surrounded by the third coil, the second coil is spirally arranged on one side of the third coil away from the vertical overflow pipe, a tap water inlet pipe is arranged at one end of the first coil, and a tap water outlet pipe is arranged at one end of the third coil.

[0008] Furthermore, the heat exchange tube includes a fourth coil and a fifth coil connected in series in sequence, the fourth coil is spirally coiled close to the inner wall of the waste hot water tank, the fifth coil is spirally coiled in the cavity of the waste hot water tank on a side away from the vertical overflow pipe, the fifth coil is surrounded by the fourth coil, one end of the fourth coil is provided with a tap water outlet pipe, and one end of the fifth coil is provided with a tap water inlet pipe.

[0009] Furthermore, a vertical drain pipe is provided in the main wash water tank, and a slag drain seat is connected to the bottom of the main wash water tank. The slag drain seat includes a first water collecting tank and a first sealing tube arranged at the bottom of the first water collecting tank. A drain port is provided on the side wall of the first sealing tube, and the lower end of the vertical drain pipe is connected to the first sealing tube for sealing the first sealing tube.

[0010] Furthermore, a circulating water pipe is provided on the side wall of the first water collecting tank, and a circulating water pump is provided at the other end of the circulating water pipe. When the main wash water tank is working, the circulating water pump transports the water in the main wash water tank through the circulating water pipe to the main wash spray arm for circulation.

[0011] Furthermore, the slag separator and drain seat also includes a slag separator net, which is connected to the top of the first water collecting tank. When the main wash water tank is working, the water in the main wash water tank passes through the slag separator net, enters the circulating water pump through the first water collecting tank and then enters the circulating water pipe under the action of the circulating water pump.

[0012] Furthermore, the bottom of the waste hot water tank is connected to a waste water drainage seat, which includes a second water collecting tank and a second sealed tube arranged at the bottom of the second water collecting tank, the side wall of the second water collecting tank is provided with a waste hot water inlet, the side wall of the second sealed tube is provided with a waste hot water outlet, the upper end of the vertical overflow pipe is provided with an overflow port, and the lower end is connected to the second sealed tube for sealing the second sealed tube.

[0013] Furthermore, the drainage port on the slag separator and drainage seat is connected to the waste hot water inlet through a connecting pipe.

[0014] Furthermore, the position of the horizontal overflow pipe is higher than the position of the overflow port.

[0015] Furthermore, the height of the vertical drain pipe is greater than the height of the horizontal overflow pipe.

[0016] Furthermore, the position of the waste hot water outlet is lower than the position of the waste hot water inlet.

[0017] Furthermore, a cover body for sealing the waste hot water tank is provided on the top of the waste hot water tank.

[0018] Furthermore, a gap is provided between the heat exchange tube and the waste hot water tank, and a limiting member is provided in the gap.

[0019] After adopting the above technical solution, the following beneficial effects are achieved:

[0020] The utility model significantly increases the total surface area and internal water volume of the heat exchange tube by designing the heat exchange tube to include at least two coil assemblies connected in series and the spiral coil is arranged in the waste water tank, thereby improving the heat exchange efficiency, so that when the tap water flows through the heat exchange tube, more volume of tap water can contact the waste water for a longer time and absorb more heat. In addition, this layout structure is compact, effectively utilizes the internal space of the waste water tank, improves the overall heat exchange effect of the system, and ensures that the tap water enters the rinsing stage at a higher temperature, thereby reducing the energy required for rinsing heating and achieving the purpose of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0022] Figure 1 is an internal schematic diagram of a dishwasher with a waste heat recovery device in one embodiment of the utility model;

[0023] Figure 2 is a schematic diagram of a waste heat recovery device in one embodiment of the utility model;

[0024] Figure 3 is a schematic diagram of a dishwasher sink in one embodiment of the utility model;

[0025] Figure 4 is a schematic diagram of a heat exchange tube in one embodiment of the utility model;

[0026] Figure 5 is a schematic diagram of a dishwasher sink in one embodiment of the utility model;

[0027] Figure 6 is a schematic diagram of a heat exchange tube in one embodiment of the utility model;

[0028] Figure 7 is a cross-sectional view at one angle of a dishwasher with a waste heat recovery device in one embodiment of the utility model;

[0029] Figure 8 It is a cross-sectional view from another angle of a dishwasher with a waste heat recovery device in one embodiment of the utility model.

[0030] Reference table of reference numerals:

[0031] 1. Main wash water tank; 11. Vertical drain pipe; 2. Waste heat recovery device; 21. Waste hot water tank; 211. Cover; 22. Heat exchange tube; 221. First coil; 222. Second coil; 223. Third coil; 224. Fourth coil; 225. Fifth coil; 226. Tap water inlet pipe; 227. Tap water outlet pipe; 23. Vertical overflow pipe; 231. Overflow port; 24. Limiting member; 3. Horizontal overflow pipe; 4. Dishwasher sink; 5. Slag drain seat; 51. First water collecting tank; 511. Circulating water pipe; 52. First sealed pipe; 521. Drain port; 53. Slag net; 6. Waste water drain seat; 61. Second water collecting tank; 611. Waste hot water inlet; 62. Second sealed pipe; 621. Waste hot water outlet; 7. Connecting pipe. DETAILED DESCRIPTION

[0032] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0033] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a variety of structural modes and implementation modes can be replaced by those skilled in the art. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction on the technical solution of the utility model.

[0034] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above-mentioned in the present utility model can be understood according to the specific circumstances.

[0036] In some embodiments of the present invention, Figure 3-4 The dishwasher with the waste heat recovery device 2 comprises a main wash water tank 1 and a waste heat recovery device 2. The main wash water tank 1 overflows the waste hot water into the waste heat recovery device 2 through a horizontal overflow pipe 3. The waste heat recovery device 2 comprises a waste hot water tank 21, a heat exchange pipe 22 and a vertical overflow pipe 23 arranged in the waste hot water tank 21. The tap water in the heat exchange pipe 22 exchanges heat with the waste hot water to output warm water. The heat exchange pipe 22 comprises a first coil 221, a second coil 222 and a third coil 223 which are sequentially connected in series. The first coil 221 is spirally coiled on the outer periphery of the vertical overflow pipe 23, the third coil 223 is spirally coiled on the outer periphery of the first coil 221, the first coil 221 is surrounded by the third coil 223, and the second coil 222 is spirally coiled on one side of the third coil 223 away from the vertical overflow pipe 23.

[0037] Specifically, the dishwasher with the waste heat recovery device 2 includes a main wash water tank 1, a waste heat recovery device 2, and the waste heat recovery device 2 includes a waste hot water tank 21, a heat exchange tube 22 (composed of a first coil 221, a second coil 222, and a third coil 223) and a vertical overflow pipe 23. The main wash water tank 1 is connected to the waste heat recovery device 2 through a horizontal overflow pipe 3, and the heat exchange tube 22 is arranged in the waste hot water tank 21. The first coil 221 is spirally wound around the outer periphery of the vertical overflow pipe 23, the third coil 223 is spirally wound around the outer periphery of the first coil 221, and the second coil 222 is spirally wound on a side away from the vertical overflow pipe 23. The first coil 221 is closely located with the vertical overflow pipe 23, the third coil 223 surrounds the first coil 221, and the second coil 222 is on a relatively independent side. The waste hot water in the main wash water tank 1 enters the waste hot water tank 21 of the waste heat recovery device 2 through the horizontal overflow pipe 3, and the tap water in the heat exchange tube 22 exchanges heat with the waste hot water, and the water temperature is increased for use by the rinsing arm. The arrangement of the first coil 221, the second coil 222 and the third coil 223 increases the heat exchange area and heat exchange efficiency. When the dishwasher is working, the main wash water tank 1 generates waste hot water and transports it to the waste heat recovery device 2, where heat exchange is performed, and the warm water after heat exchange is used for subsequent rinsing. By setting a multi-coil heat exchange tube 22 structure, the heat exchange capacity is improved, the heat in the waste hot water is better utilized, and the energy-saving effect is achieved. The specific form and winding method of the coil can be adjusted according to actual needs, such as the diameter and number of turns of the coil. The dishwasher with the waste heat recovery device 2 can effectively recover the heat of the waste hot water, reduce energy consumption, achieve energy saving and environmental protection while ensuring the cleaning effect, improve energy utilization efficiency, and reduce operating costs.

[0038] In some embodiments of the present invention, a tap water inlet pipe 226 is disposed at one end of the first coil 221 , and a tap water outlet pipe 227 is disposed at one end of the third coil 223 .

[0039] Specifically, a tap water inlet pipe 226 is provided at one end of the first coil 221. This design not only facilitates the introduction of tap water, but also ensures a stable supply of water. Tap water flows in continuously through this inlet, providing a continuous and stable water source for the normal operation of the device. At the same time, the tap water inlet pipe 226 is arranged on the side wall of the waste hot water tank 21. Such a layout not only saves space, but also facilitates installation and maintenance, while avoiding direct contact with waste hot water, ensuring the purity of tap water. Corresponding to the tap water inlet pipe 226, a tap water outlet pipe 227 is provided at one end of the third coil 223. Similarly, this outlet is also arranged on the side wall of the waste hot water tank 21. Such a design allows the tap water treated by the device to be discharged smoothly for subsequent use.

[0040] In some embodiments of the present invention, Figure 5-6The heat exchange tube 22 includes a fourth coil 224 and a fifth coil 225 which are sequentially connected in series. The fourth coil 224 is spirally coiled close to the inner wall of the waste hot water tank 21, and the fifth coil 225 is spirally coiled in the cavity of the waste hot water tank 21 on a side away from the vertical overflow pipe 23. The fifth coil 225 is surrounded by the fourth coil 224. A tap water outlet pipe 227 is provided at one end of the fourth coil 224, and a tap water inlet pipe 226 is provided at one end of the fifth coil 225.

[0041] Specifically, the fourth coil 224 is spirally coiled close to the inner wall of the waste hot water tank 21, which can maximize the contact area with the waste hot water and improve the heat exchange efficiency. The fifth coil 225 is spirally coiled on the side of the cavity of the waste hot water tank 21 away from the vertical overflow pipe 23, which can avoid interference with the vertical overflow pipe 23 and increase the contact time with the waste hot water. The fifth coil 225 is surrounded by the fourth coil 224, which can form a closed space, reduce heat loss, and improve the heat exchange effect. A tap water outlet pipe 227 is provided at one end of the fourth coil 224, and a tap water inlet pipe 226 is provided at one end of the fifth coil 225, which can form a complete waterway to ensure the smooth flow and heat exchange of tap water.

[0042] In some embodiments of the utility model, a slag drain seat 5 for draining and separating slag is provided at the bottom of the main wash water tank 1, and a wastewater drain seat 6 is provided at the bottom of the waste heat recovery device 2. The slag drain seat 5 and the wastewater drain seat 6 are external devices of the main wash water tank 1 and the waste heat recovery device 2, respectively, and the two drain seats are connected by a connecting pipe 7. When the dishwasher finishes working, it is necessary to drain all the waste hot water in the main wash water tank 1 and the waste hot water in the waste heat recovery device 2. At this time, it is necessary to pull up the vertical drain pipe 11 in the main wash water tank 1 and the vertical overflow pipe 23 in the waste hot water tank 21, so that the waste hot water in the main wash water tank 1 will flow through the connecting pipe 7 to the wastewater drain seat 6 at the bottom of the waste hot water tank 21, and then be discharged to the sewer through the waste hot water outlet 621 on the wastewater drain seat 6. When the dishwasher is working, the main wash water tank 1 transports the waste hot water to the waste hot water recovery device through the horizontal overflow pipe 3 to exchange heat with the heat exchange tube 22. Since the last step of each dishwashing operation requires washing with clean water, that is, the water in the rinsing arm will enter the main wash water tank 1, which will cause the water level in the main wash water tank 1 to rise until the liquid level exceeds the opening of the horizontal overflow pipe 3 in the main wash water tank 1. The waste hot water overflows into the waste hot water tank 21 through the horizontal overflow pipe 3, and the water level in the waste hot water tank 21 also rises accordingly. When the liquid level in the waste hot water tank 21 exceeds the overflow port 231 of the vertical overflow pipe, the low-temperature water that has absorbed the residual heat by the heat exchange tube 22 overflows into the sewer through the overflow port 231 of the vertical overflow pipe.

[0043] During the operation of the dishwasher, the waste hot water in the main wash water tank 1 is first effectively drained into the waste hot water tank 21 through the horizontal overflow pipe. At the same time, the waste hot water is also introduced into the main wash spray wall through the circulating water pipe 511 in the working process of the dishwasher to realize the recycling of water resources. Specifically, under the promotion of the circulating water pump, the waste hot water is first finely filtered through the slag screen 53 installed at the upper end of the slag screen drain seat 5 to ensure the purity of the water quality. Subsequently, the filtered waste hot water flows into the circulating water pipe 511 at the lower end of the slag screen drain seat 5, and then enters the main wash spray arm. In this process, the main wash spray arm reuses the water to wash the tableware. After washing, the water passes through the filter screen again and enters the main wash water tank 1, ready for the next recycling. This circulation process is intended to improve the efficiency of water resource utilization while ensuring the cleanliness of the tableware.

[0044] In addition, during the operation of the dishwasher, the liquid level in the waste hot water tank 21 will remain inside and will not flow out before reaching the overflow port 231 provided on the vertical overflow pipe 23. Once the liquid level in the waste hot water tank 21 exceeds the overflow port 231, the waste hot water will enter from the overflow port 231, flow through the vertical overflow pipe 23, and finally be discharged into the waste hot water outlet 621 through the opening at the bottom end of the vertical overflow pipe 23.

[0045] In some embodiments of the utility model, a vertical drain pipe 11 is provided in the main wash water tank 1, and a slag drain seat 5 is connected to the bottom of the main wash water tank 1. The slag drain seat 5 includes a first water collecting tank 51 and a first sealing tube 52 arranged at the bottom of the first water collecting tank 51. A drain port 521 is provided on the side wall of the first sealing tube 52. The lower end of the vertical drain pipe 11 is plugged into the first sealing tube 52 to seal the first sealing tube 52. A circulating water pipe 511 is provided on the side wall of the first water collecting tank 51, and a circulating water pump is provided at the other end of the circulating water pipe 511. When the main wash water tank 1 is working, the circulating water pump transports the water in the main wash water tank 1 to the main wash spray arm through the circulating water pipe 511 for circulation. The slag drainage seat 5 also includes a slag net 53, which is connected to the top of the first water collecting tank 51. When the main wash water tank 1 is working, the water in the main wash water tank 1 passes through the slag net 53 and the first water collecting tank 51 under the action of the circulating water pump and then enters the circulating water pipe 511.

[0046] Specifically, the design of the slag separation and drainage seat 5 includes three main components: a slag separation net 53, a first water collection tank 51, and a first sealing tube 52, which are tightly connected from top to bottom. A slag separation net 53 is cleverly arranged between the cavity of the main wash water tank 1 and the first water collection tank 51 to ensure that the waste hot water can be effectively filtered when flowing through, and then smoothly enter the first water collection tank 51. The cavity of the main wash water tank 1, the cavity of the first water collection tank 51, and the cavity of the first sealing tube 52 are interconnected to form a smooth liquid channel.

[0047] The vertical drain pipe 11 first passes through the slag screen 53, then passes through the cavity of the first water collecting tank 51, and finally is accurately inserted into the first sealing tube 52, ensuring that it matches the shape of the first sealing tube 52 and is tightly connected by interference fit. This design is intended to prevent water from leaking from the gap between the first sealing tube 52 and the vertical drain pipe 11 when the dishwasher is working, ensuring that water can only flow out from the drain port 521 on the side wall of the first sealing tube 52, thereby maintaining the normal operation of the dishwasher.

[0048] When the dishwasher finishes working, the vertical drain pipe 11 can be easily taken out from the first sealed tube 52. At this time, water can pass through the first water collecting tank 51 and the first sealed tube 52 in sequence, and finally be discharged from the drain port 521 on the side wall of the first sealed tube 52, realizing a convenient drainage function. When the dishwasher is in working state, the waste hot water in the first water collecting tank 51 flows out through the circulating water pipe 511 on the side wall of the first water collecting tank 51 only under the action of the circulating water pump, and participates in the water circulation process of the dishwasher. At this time, since the vertical drain pipe 11 has been inserted into the first sealed tube 52, the first sealed tube 52 at the bottom of the first water collecting tank 51 is effectively blocked, ensuring that water can only flow out from the circulating water pipe 511 according to the designed path, maintaining the stable operation of the dishwasher.

[0049] In some embodiments of the utility model, the bottom of the waste water tank 21 is connected to a waste water drain seat 6, the waste water drain seat includes a second water collecting tank 61 and a second sealing pipe 62 arranged at the bottom of the second water collecting tank 61, the side wall of the second water collecting tank 61 is provided with a waste water inlet 611, the side wall of the second sealing pipe 62 is provided with a waste water outlet 621, the upper end of the vertical overflow pipe 23 is provided with an overflow port 231, and the lower end is plugged with the second sealing pipe 62 for sealing the second sealing pipe 62. The drain port 521 on the slag separation drain seat 5 is connected to the waste water inlet 611 through a connecting pipe 7.

[0050] Specifically, the vertical overflow pipe 23 is a pipe or device, which is usually used to discharge or guide liquid. The overflow port 231 is an opening on the vertical overflow pipe 23. When the liquid exceeds its designed capacity, the excess liquid can flow out through the overflow port 231. The function of this overflow port 231 is to monitor the liquid level of the waste hot water. When the liquid level of the waste hot water gradually rises and reaches or even exceeds the height of the overflow port 231, the system will automatically start the discharge procedure. This design effectively avoids the risk of overflow of waste hot water caused by excessively high liquid levels, thereby ensuring the normal operation of the system.

[0051] In addition, the wastewater drainage seat includes two major components, the second water collecting tank 61 and the second sealing tube 62, which are closely connected to form a smooth passage. Among them, the cavity of the wastewater hot water tank 21, the cavity of the second water collecting tank 61 and the cavity of the second sealing tube 62 are all connected to each other from top to bottom. The vertical overflow pipe 23 is designed to be located in the cavity of the wastewater hot water tank 21 at the top, and to pass through the cavity of the second water collecting tank 61 at the bottom, and finally inserted into the second sealing tube 62.

[0052] During normal operation of the dishwasher, the second sealing tube 62 forms a tight interference fit with the vertical overflow pipe 23, ensuring that the vertical overflow pipe 23 effectively blocks the second sealing tube 62, thereby preventing the water in the second water collecting tank 61 from flowing out through the small gap between the two. At this time, the waste hot water can only be discharged through the overflow port 231. Specifically, when the dishwasher is in operation, excess water will flow into the cavity of the overflow pipe through the overflow port 231, then pass through the overflow pipe orifice, and finally be discharged smoothly through the waste hot water outlet 621 on the side wall of the second sealing tube 62.

[0053] When the dishwasher is finished working, the vertical overflow pipe 23 will be pulled out from the second sealed pipe 62, and the vertical overflow pipe 23 will no longer block the second sealed pipe 62. At this time, the water will flow through the second water collecting tank 61 and the second sealed pipe 62 in sequence, and finally be discharged through the waste hot water outlet 621 on the side wall of the second sealed pipe 62. At the same time, the drain port 521 on the first sealed pipe 52 and the waste hot water inlet 611 on the second water collecting tank 61 are connected through a special connecting pipe 7. When the dishwasher is finished working, the vertical drain pipe 11 will be taken out from the first sealed pipe 52, and the vertical overflow pipe 23 will also be taken out from the second sealed pipe 62. At this time, the water in the main washing water tank 1 will flow through the first water collecting tank 51, the first sealed pipe 52, the drain port 521, the waste hot water inlet 611, the second water collecting tank 61, the second sealed pipe 62 in sequence, and finally be discharged from the waste hot water outlet 621 on the side wall of the second sealed pipe 62.

[0054] In some embodiments of the present invention, the position of the horizontal overflow pipe 3 is higher than the position of the overflow port 231 .

[0055] Specifically, a first opening is provided on one side wall of the main wash water tank 1, and a second opening is provided at a corresponding position of the waste hot water tank 21. The two openings are arranged correspondingly and are located at the same horizontal plane, so as to ensure that the liquid can accurately overflow from the main wash water tank 1 to the waste hot water tank 21 through the horizontal overflow pipe 3. In addition, in order to ensure the smooth flow of the fluid, a horizontal overflow pipe 3, such as a pipe or a conduit, is installed between the two openings to ensure that the liquid can pass smoothly. The positions of the two openings are both arranged at a higher position than the overflow port 231, so that the highest liquid level of the liquid in the waste hot water tank 21 will not exceed the opening, and the liquid in the waste hot water tank 21 is prevented from flowing back into the main wash water tank 1. The floating oil impurities on the surface of the liquid in the main wash water tank 1 directly flow into the waste hot water tank 21, and these floating oil impurities are prevented from participating in the water circulation of the main wash water tank 1 in the main wash water tank 1. This method makes the circulating water in the main wash water tank 1 cleaner, is conducive to the recycling of water in the main wash water tank 1, and improves the washing effect and the practicality of the equipment.

[0056] In some embodiments of the present invention, the location of the waste hot water outlet 621 is lower than the location of the waste hot water inlet 611 .

[0057] Specifically, the position of the waste hot water outlet 621 is lower than the position of the waste hot water inlet 611, which can ensure that the waste hot water can flow out of the water collecting tank smoothly and avoid water accumulation.

[0058] In some embodiments of the utility model, the openings at the top of the main wash water tank 1 and the waste hot water tank 21 are connected to the bottom wall of the dishwasher sink 4, a filter is provided at the top of the opening of the main wash water tank 1, and the water in the dishwasher sink 4 enters the main wash water tank 1 through the filter, and the opening of the waste hot water tank 21 is in a sealed state.

[0059] Specifically, the openings at the top of the main wash water tank 1 and the waste hot water tank 21 are connected to the bottom wall of the dishwasher sink 4, so that the water in the dishwasher sink 4 can directly enter the main wash water tank 1 through the filter, reducing the intermediate links and improving work efficiency. A filter is provided at the top of the opening of the main wash water tank 1, so that impurities in the water can be filtered out to ensure the quality of the water entering the main wash water tank 1. The opening of the waste hot water tank 21 is in a sealed state, so that the water in the dishwasher sink 4 can be prevented from entering the waste hot water tank 21 through the opening at the top of the waste hot water tank 21, and the heat loss in the waste hot water tank 21 can also be prevented, thereby improving the heat exchange efficiency.

[0060] In some embodiments of the present invention, the opening of the waste hot water tank 21 is provided with a cover 211 for sealing the opening.

[0061] Specifically, this makes it convenient for the staff to clean the waste hot water tank 21 and take out the heat exchange tube 22 for cleaning. At the same time, the cover 211 can also prevent the water in the dishwasher tank 4 from entering the waste hot water tank 21 through the opening at the top of the waste hot water tank 21, affecting the normal operation of the waste hot water tank 21.

[0062] In some embodiments of the present invention, a gap is provided between the heat exchange tube 22 and the waste hot water tank 21, and a limiting member 24 is provided in the gap.

[0063] Specifically, a gap is provided between the heat exchange tube 22 and the waste water tank 21, so that direct contact between the heat exchange tube 22 and the waste water tank 21 can be avoided, heat loss is reduced, and heat exchange efficiency is improved. At the same time, a stopper 24 is provided in the gap, so that the position of the heat exchange tube 22 can be limited, so that the heat exchange tube 22 can be prevented from shaking during operation, which affects the heat exchange effect.

[0064] In some embodiments of the present invention, the height of the vertical drain pipe 11 is greater than the height of the horizontal overflow pipe 3 .

[0065] Specifically, in order to ensure that the staff can more conveniently remove the vertical drain pipe 11, the design adopts an appropriate height setting. Under this layout, the liquid level in the main wash water tank 1 is always kept below the height of the horizontal overflow pipe 3, thereby effectively ensuring that the height of the vertical drain pipe 11 is higher than the horizontal overflow pipe 3. This design allows the top of the vertical overflow pipe 23 to be higher than the liquid level in the main wash water tank 1, which is not only convenient for the staff to perform the removal operation, but also effectively prevents the staff from being scalded due to contact with high-temperature liquid during the operation, and prevents the arms from being contaminated by the liquid.

[0066] The utility model significantly increases the total surface area and internal water volume of the heat exchange tube 22 by designing the heat exchange tube 22 to include at least two coil assemblies connected in series and the spiral coil is arranged in the waste hot water tank 21, thereby improving the heat exchange efficiency, so that when the tap water flows through the heat exchange tube 22, a larger volume of tap water can be in contact with the waste hot water for a longer time and absorb more heat. In addition, this layout structure is compact, effectively utilizes the internal space of the waste hot water tank 21, improves the overall heat exchange effect of the system, and ensures that the tap water enters the rinsing stage at a higher temperature, thereby reducing the energy required for rinsing heating and achieving the purpose of energy saving.

[0067] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A dishwasher with a waste heat recovery device, characterized in that: It includes a main wash water tank and a waste heat recovery device. The main wash water tank overflows the waste hot water into the waste heat recovery device through a horizontal overflow pipe. The waste heat recovery device includes a waste hot water tank, a heat exchange pipe and a vertical overflow pipe arranged in the waste hot water tank. The tap water in the heat exchange pipe exchanges heat with the waste hot water to output warm water. The heat exchange pipe includes at least two coil assemblies connected in series in sequence, and the spiral coil is arranged in the waste hot water tank.

2. The dishwasher with waste heat recovery device according to claim 1, characterized in that: The heat exchange tube includes a first coil, a second coil and a third coil connected in series in sequence, the first coil is spirally arranged on the outer periphery of the vertical overflow pipe, the third coil is spirally arranged on the outer periphery of the first coil, the first coil is surrounded by the third coil, the second coil is spirally arranged on one side of the third coil away from the vertical overflow pipe, a tap water inlet pipe is arranged at one end of the first coil, and a tap water outlet pipe is arranged at one end of the third coil.

3. The dishwasher with waste heat recovery device according to claim 1, characterized in that: The heat exchange tube includes a fourth coil and a fifth coil connected in series in sequence, the fourth coil is spirally coiled close to the inner wall of the waste hot water tank, the fifth coil is spirally coiled in the cavity of the waste hot water tank on a side away from the vertical overflow pipe, the fifth coil is surrounded by the fourth coil, one end of the fourth coil is provided with a tap water outlet pipe, and one end of the fifth coil is provided with a tap water inlet pipe.

4. The dishwasher with waste heat recovery device according to claim 1, characterized in that: A vertical drain pipe is provided in the main wash water tank, and a slag drain seat is connected to the bottom of the main wash water tank. The slag drain seat includes a first water collecting tank and a first sealing tube arranged at the bottom of the first water collecting tank. A drain port is provided on the side wall of the first sealing tube, and the lower end of the vertical drain pipe is connected to the first sealing tube for sealing the first sealing tube.

5. The dishwasher with waste heat recovery device according to claim 4, characterized in that: A circulating water pipe is provided on the side wall of the first water collecting tank, and a circulating water pump is provided at the other end of the circulating water pipe. When the main wash water tank is working, the circulating water pump transports the water in the main wash water tank to the main wash spray arm through the circulating water pipe for circulation.

6. The dishwasher with waste heat recovery device according to claim 5, characterized in that: The slag drainage seat also includes a slag net, which is connected to the top of the first water collecting tank. When the main wash water tank is working, the water in the main wash water tank passes through the slag net, the first water collecting tank, the circulating water pump and then the circulating water pipe under the action of the circulating water pump.

7. The dishwasher with waste heat recovery device according to claim 6, characterized in that: The bottom of the waste water hot water tank is connected to a waste water drainage seat, which includes a second water collecting tank and a second sealed tube arranged at the bottom of the second water collecting tank. The side wall of the second water collecting tank is provided with a waste water hot water inlet, and the side wall of the second sealed tube is provided with a waste water hot water outlet. The upper end of the vertical overflow pipe is provided with an overflow port, and the lower end is connected to the second sealed tube for sealing the second sealed tube.

8. The dishwasher with waste heat recovery device according to claim 7, characterized in that: The drainage port on the slag separation and drainage seat is connected with the waste hot water inlet through a connecting pipe.

9. The dishwasher with waste heat recovery device according to claim 7, characterized in that: The position of the horizontal overflow pipe is higher than the position of the overflow port.

10. The dishwasher with waste heat recovery device according to claim 4, characterized in that: The height of the vertical drain pipe is greater than the height of the horizontal overflow pipe.

11. The dishwasher with waste heat recovery device according to claim 7, characterized in that: The position of the waste hot water outlet is lower than the position of the waste hot water inlet.

12. The dishwasher with waste heat recovery device according to claim 1, characterized in that: A cover body for sealing the waste hot water tank is provided on the top of the waste hot water tank.

13. The dishwasher with waste heat recovery device according to claim 1, characterized in that: A gap is provided between the heat exchange tube and the waste hot water tank, and a limiting member is provided in the gap.

14. The dishwasher with waste heat recovery device according to claim 1, characterized in that: The openings at the top of the main wash water tank and the waste hot water tank are both connected to the bottom wall of the dishwasher sink. A filter is provided at the top of the opening of the main wash water tank. Water in the dishwasher sink enters the main wash water tank through the filter. The opening of the waste hot water tank is sealed.

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