Energy-saving long-dragon type dish washing machine

Abstract

This utility model provides an energy-saving long-line dishwasher, including a frame with a main washing chamber, a rinsing chamber, a drying chamber, a conveying assembly, a PTC heating assembly, a wastewater heat recovery assembly, and a heat pump device. The main washing spray pipe is connected to the main washing water tank via a pumping assembly. The bottom of the rinsing chamber is connected to the main washing water tank, and the side wall of the main washing water tank has an overflow port connected to the wastewater inlet of the wastewater heat recovery assembly. The wastewater outlet of the wastewater heat recovery assembly is connected to an external drain. Tap water in the main water inlet pipe is heated sequentially through the wastewater heat recovery assembly, the heat pump device, and the PTC heating assembly before being connected to the rinsing spray pipe. The drying chamber is equipped with a drying assembly for removing water stains from the surface of tableware. The energy-saving long-line dishwasher provided by this utility model recovers wastewater and steam waste heat and transfers the heat to the tap water. The preheated tap water enters the main heating assembly and heats up in a short time, saving energy.

Description

Technical Field

[0001] This utility model relates to the field of commercial dishwasher technology, and more specifically, to an energy-saving long-line dishwasher. Background Technology

[0002] Commercial dishwashers are a new type of kitchen dishwashing equipment, mainly used in kitchens of schools, hotels, businesses, military units, and dishwashing disinfection companies where the volume of dishwashing is high. Compared to manual washing, commercial dishwashers have advantages such as high washing efficiency, reduced labor costs, and solving the problem of insufficient dishwashing supply.

[0003] Commercial dishwashers are mainly divided into: undermount dishwashers, top-loading dishwashers, aisle dishwashers, and energy-efficient long-line dishwashers. Energy-efficient long-line dishwashers typically include multiple chambers, which can be divided into a main wash chamber, a rinsing chamber, and a drying chamber along the direction of food movement. Main wash process: The main wash pump draws water from the main wash tank and sprays it directly onto the surface of the dishes through the main spray arm, rinsing away food residue and grease. The rinse water then returns to the main wash tank, achieving recycling. Rinsing process: Tap water enters the dishwasher's main heating element and is heated by a high-power heating element, quickly reaching a temperature above 80℃. The high-temperature water from the main heating element is sprayed onto the surface of the dishes through the rinsing spray arm, and finally falls back into the main wash tank.

[0004] Existing dishwashers typically use external water for rinsing, which is directly heated by a heating pack and then sprayed onto the dishes via a spray arm. This method requires a long time to heat the water from room temperature to above 80°C, resulting in high energy consumption. Furthermore, the overflow of hot water from the main wash tank is directly discharged into the drain, failing to fully utilize the waste heat from the wastewater and steam, thus wasting resources. Utility Model Content

[0005] To overcome at least one of the defects in the prior art, this utility model provides an energy-saving long-line dishwasher that can recover existing waste hot water and steam waste heat and transfer the heat to tap water, so that the tap water is preheated multiple times before entering the main heating pack, thereby effectively reducing the heating time of the main heating pack and saving energy.

[0006] The technical solution adopted by this utility model is as follows: An energy-saving long-line dishwasher is provided, including a frame. A main washing chamber, a rinsing chamber, and a drying chamber are sequentially arranged along the length of the frame. The frame also includes a conveying assembly for moving a washing basket containing tableware through the main washing chamber, rinsing chamber, and drying chamber sequentially. A main washing spray pipe and a rinsing spray pipe are respectively installed in the main washing chamber and rinsing chamber. The frame also includes a main water inlet pipe, a main washing water tank, a PTC heating element, a wastewater heat recovery element, and a heat pump device. The main wash spray pipe is connected to the main wash water tank via a pumping assembly. The bottom of the rinsing chamber is connected to the main wash water tank, and the side wall of the main wash water tank is provided with an overflow port connected to the wastewater inlet of the wastewater heat recovery assembly. The wastewater outlet of the wastewater heat recovery assembly is connected to an external drain. The tap water in the main water inlet pipe is heated sequentially through the wastewater heat recovery assembly, the heat pump device, and the PTC heating assembly before being connected to the rinsing spray pipe. The drying chamber is provided with a drying assembly for removing water stains from the surface of the tableware.

[0007] Furthermore, the heat pump device includes an evaporator, a heat exchanger, and a compressor that are interconnected. The evaporator is located at the top of the rinsing chamber, and the lower end of the evaporator is provided with a heat collection hood with a lower opening. The frame is also provided with a first heat collection tube for collecting steam in the main washing chamber and the rinsing chamber to the heat collection hood, and a second heat collection tube for collecting hot air in the drying chamber to the heat collection hood.

[0008] Furthermore, the wastewater heat recovery assembly includes a wastewater tank and a heat exchange coil. One side wall of the wastewater tank along its length is provided with a wastewater inlet communicating with its inner cavity and a clean water inlet connected to one end of the heat exchange coil. The other side wall of the wastewater tank is provided with a wastewater outlet communicating with its inner cavity and a clean water outlet connected to the other end of the heat exchange coil. The outlet end of the main water inlet pipe is connected to the clean water inlet, and the clean water outlet is connected to the heat pump device.

[0009] As an improvement, the wastewater tank is further provided with a plurality of fins arranged at intervals along its length, the plurality of fins being used to divide the wastewater tank into a plurality of chambers, and the chambers being interconnected; each of the fins is provided with a connection hole for the heat exchange coil to pass through.

[0010] In a further improvement, water passage holes with staggered vertical alignment are sequentially opened on each pair of adjacent fins, and multiple grooves and / or protrusions are provided on the surface of each fin.

[0011] Furthermore, the PTC heating assembly includes a cylinder and a PTC heating tube. The cylinder is divided into an inlet chamber, a mixing chamber, and an outlet chamber along its length. An inlet pipe communicating with the inlet chamber and an outlet pipe communicating with the outlet chamber are provided on the side wall of the cylinder. Water passages exist between adjacent chambers in the inlet, mixing, and outlet chambers. The PTC heating tube is detachably connected to the cylinder and extends axially into the inlet, mixing, and outlet chambers. A first detection element and a second detection element are also connected to the side wall of the cylinder for detecting the water temperature in the inlet and outlet chambers, respectively. When the water temperature in the inlet chamber is lower than a first set value, the PTC heating tube starts heating; when the water temperature in the outlet chamber is higher than a second set value, the PTC heating tube stops heating.

[0012] Furthermore, the inner wall of the cylinder is connected to two partitions spaced apart along its length to divide the inner cavity of the cylinder into an inlet chamber, a mixing chamber, and an outlet chamber. The middle of each partition is provided with a first mounting hole for the PTC heating tube to pass through, and each partition is also provided with multiple connecting holes to form the water passage.

[0013] Furthermore, the cylinder includes a hollow circular tube, with end caps connected to both ends of the circular tube. Each end cap has a second mounting hole for the PTC heating tube to pass through, and one end of the PTC heating tube is connected to a connecting flange. The connecting flange is detachably connected to the end cap with the second mounting hole.

[0014] Furthermore, the drying assembly includes a blower, an electric heating assembly, and a return air plate. The electric heating assembly includes a housing with openings at both the top and bottom. The housing is inserted into a mounting through hole on the top plate of the drying chamber. An electric heating unit is connected to the inner wall of the housing. The blower is connected to the upper end of the housing, and the air outlet of the blower is connected to the upper opening of the housing. An air knife is connected to the lower opening of the housing. The return air plate is located on the bottom plate of the drying chamber and is located directly below the air knife.

[0015] Preferably, the return air plate is composed of multiple V-shaped plates connected side by side.

[0016] Compared with the prior art, the energy-saving long-line dishwasher of this utility model has the following advantages:

[0017] 1. A wastewater heat recovery component and a heat pump device have been added to the dishwasher's main unit frame. Before entering the PTC heating component, the external tap water undergoes a first heat exchange with the wastewater heat recovery component and a second heat exchange with the refrigerant via the heat pump component. After being heated twice, the tap water enters the main PTC heating component for final heating. Because the tap water is preheated twice, the time required to heat to the preset temperature in the heating unit is shorter, and energy consumption is lower. According to experimental statistics, this double preheating method can save 50%-60% of energy consumption.

[0018] 2. In the heat pump device, the evaporator is used to absorb the heat from the hot air in the heat collection hood and transfer the heat to the refrigerant. The high-temperature and high-pressure refrigerant transfers heat energy to the tap water flowing through the heat pump in the heat exchanger, so that the tap water is heated. In this structure, in addition to the wastewater heat in the main washing chamber and rinsing chamber being absorbed into the heat collection hood, the high-temperature gas in the drying chamber is also absorbed into the heat collection hood, which effectively improves the waste heat utilization efficiency.

[0019] 3. Multiple finned structures were added to the wastewater tank, dividing the tank's interior into interconnected chambers. This effectively extends the residence time of hot wastewater within the tank, allowing for better heat exchange between the clean water and the hot wastewater in the heat exchange tubes. This improves preheating efficiency, reduces heating time in the subsequent main heating stage, and lowers energy consumption. Furthermore, the fins themselves quickly absorb heat from the wastewater and conduct it to the heat exchange tubes, thereby heating the clean water. The second heat exchange coil is made of a corrugated metal structure, which increases the heat exchange area and improves efficiency compared to a straight-wall coil. Additionally, the corrugated structure inside the tube creates a turbulent flow of water, eliminating dead zones and reducing scaling.

[0020] 4. The dishwasher's structure also features an improved heating unit, employing a PTC heating element. Its heat conversion efficiency reaches 99%, a 25% improvement compared to the approximately 75% efficiency of older resistance wire heating elements. Furthermore, the PTC heating element is designed to prevent dry burning and is less prone to damage. Heating begins once the drum is filled with water and continues until the desired temperature is reached, at which point hot water is released from the outlet. The entire system is divided into three zones by a perforated partition: a low-temperature zone, a mixing zone, and a high-temperature zone. When the temperature probe in the low-temperature zone reads below a certain value, the PTC heating element activates; when the temperature in the high-temperature zone exceeds a certain value, the PTC heating element stops heating, thus saving energy. This structure also ensures that the temperature of the water outlet remains constant within a certain range.

[0021] Other improvements and advantages of this invention will be set forth in the detailed description that follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures particularly pointed out in the description and drawings. Attached Figure Description

[0022] Figure 1 This is a perspective view of the energy-saving long-line dishwasher of this utility model;

[0023] Figure 2 This is another perspective view of the energy-saving long-line dishwasher of this utility model;

[0024] Figure 3 This is another perspective view of the energy-saving long-line dishwasher of this utility model;

[0025] Figure 4 This is a structural diagram of the wastewater heat recovery device of this utility model;

[0026] Figure 5 This is a structural diagram of the wastewater heat recovery device in this utility model without the outer casing.

[0027] Figure 6 for Figure 5 Another perspective view of the structure;

[0028] Figure 7 This is a structural diagram of the PTC heating assembly in this utility model;

[0029] Figure 8 This is a cross-sectional view of the PTC heating component in this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Frame; 2. Main wash spray pipe; 3. Rinse spray pipe; 4. Main wash water tank; 5. Wastewater inlet; 6. Overflow outlet; 7. Wastewater outlet; 8. Evaporator; 9. Heat exchanger; 10. Compressor; 11. Heat collector cover; 12. First heat collector tube; 13. Second heat collector tube; 14. Wastewater tank; 15. Heat exchange coil; 16. Clean water inlet; 17. Clean water outlet; 18. Fins; 19. Water passage hole; 20. PTC heating tube 21. Inlet chamber; 22. Mixing chamber; 23. Outlet chamber; 24. Inlet pipe; 25. Outlet pipe; 26. Connecting hole; 27. First detection element; 28. Second detection element; 29. ​​Partition plate; 30. Round pipe; 31. End cover plate; 32. Connecting flange; 33. Drain bolt; 34. Blower; 35. Electric heating assembly; 36. Return air plate; 37. Suction channel; 38. Exhaust fan; 39. Exhaust duct; Detailed Implementation

[0032] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0033] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "fixed" and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0034] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] See Figures 1-8 As shown in the figure, this application discloses an energy-saving long-line dishwasher, including a frame 1. The frame 1 has a main washing chamber, a rinsing chamber and a drying chamber arranged sequentially along its length. The main washing chamber, the rinsing chamber and the drying chamber are interconnected along the length of the frame 1. A tableware inlet is provided at one end of the frame 1 near the main washing chamber and a tableware outlet is provided at the other end of the frame 1. The frame 1 is also provided with a conveying assembly extending along its length. That is, the tableware enters the dishwasher from the inlet and then passes through the main washing chamber, the rinsing chamber and the drying chamber in sequence under the action of the conveying assembly, and finally transfers to the transfer box from the outlet. The conveying assembly here is a conventional structure, generally including a drive shaft, a driven shaft and a drive motor. The drive motor is used to drive the drive shaft to rotate. The drive shaft and the driven shaft are respectively connected to the two ends of the frame 1, and a conveyor belt is fitted on the outside of the drive shaft and the driven shaft. The conveyor belt is provided with limiting teeth for positioning the tableware.

[0036] In addition, a main wash spray pipe 2 and a rinse spray pipe 3 are respectively installed in the main wash chamber and the rinse chamber. The frame 1 is also equipped with a main water inlet pipe 24, a main wash water tank 4, a PTC heating component, a wastewater heat recovery component, and a heat pump device. The main wash spray pipe 2 and the main wash water tank 4 are connected through a pumping component. Specifically, a water pump and pipeline are installed at the lower end of the frame 1. The main wash water in the main wash water tank 4 is pumped to the main wash spray pipe 2 through the water pump and the corresponding pipeline for high-pressure rinsing of the tableware. After the main wash, the tableware enters the rinse chamber and is rinsed with high-temperature clean water through the rinse spray pipe 3. The bottom of the rinse chamber is connected to the main wash water tank. The wastewater after rinsing flows into the main wash water tank 4 to save water resources.

[0037] Furthermore, an overflow port 6 is provided on the side wall of the main washing water tank 4, which is connected to the wastewater inlet of the wastewater heat recovery component. The wastewater outlet 7 of the wastewater heat recovery component is connected to the external drain. The tap water in the main water inlet pipe 24 is heated by the wastewater heat recovery component, the heat pump device and the PTC heating component in sequence and then connected to the rinsing spray pipe 3. A drying component for removing water stains from the surface of tableware is provided in the drying chamber.

[0038] In the above structure, the water flow path is as follows: clean tap water (temperature approximately 20 degrees Celsius) first enters the wastewater heat recovery component along the main inlet pipe 24, where it undergoes initial heat exchange with the high-temperature wastewater, raising the water temperature to approximately 40-45 degrees Celsius. Then, the tap water continues to flow through the pipeline into the heat pump device for heat exchange, raising the water temperature again to approximately 70-75 degrees Celsius. Finally, the tap water enters the PTC heating component for heating, raising the tap water temperature to approximately 90-95 degrees Celsius. The tap water heated to the set temperature then enters the rinsing spray pipe 3 to perform high-temperature rinsing on the tableware that has passed through the rinsing chamber. Compared to the traditional method where external tap water is directly heated to the required temperature by the PTC heating component, this method not only effectively reduces heating time but also significantly saves energy and reduces costs.

[0039] In this embodiment, see Appendix Figure 2 The heat pump unit includes an evaporator 8, a heat exchanger, and a compressor 10, which are interconnected. The evaporator 8 is located at the top of the rinsing chamber, and its lower end is equipped with a heat collection hood 11 with an opening at the bottom. The frame 1 is also equipped with a first heat collection pipe 12 for collecting steam from the main washing chamber and the rinsing chamber to the heat collection hood 11, and a second heat collection pipe 13 for collecting hot air from the drying chamber to the heat collection hood 11. In other words, the heat pump unit realizes the recovery and utilization of waste heat in the dishwasher's inner cavity. The evaporator 8 is used to absorb heat and transfer it to the refrigerant. The high-temperature and high-pressure refrigerant transfers heat energy to the tap water flowing through the heat pump in the heat exchanger, thereby raising the temperature of the tap water. In this structure, in addition to the waste heat from the main washing chamber and the rinsing chamber being absorbed into the heat collection hood 11, the high-temperature gas in the drying chamber is also absorbed into the heat collection hood 11, effectively improving the waste heat utilization efficiency.

[0040] In the above structure, see Appendix Figure 2 , 3 A connecting hole 26 is provided on the top plate of the main washing chamber near the tableware inlet. An exhaust fan 38 and an exhaust pipe 39 are connected above the top plate of the main washing chamber. The inlet of the exhaust pipe 39 is connected to the connecting hole 26, and the outlet is connected to the first heat collection pipe 12. It is used to absorb the hot air in the main washing chamber and the rinsing chamber to the heat collection cover 11 to achieve heat exchange with the evaporator 8 and use steam preheating to preheat the tap water flowing through the heat pump device.

[0041] In this embodiment, see Appendix Figure 4 , 56. Wastewater heat recovery assembly, which includes a rectangular wastewater tank 14, a heat exchange coil 15, and multiple fins 18 spaced apart along the length of the wastewater tank 14. The multiple fins 18 are used to divide the inner cavity of the wastewater tank 14 into multiple independent chambers, and the chambers are interconnected. The heat exchange coil 15 is a coil structure, and each fin 18 is provided with a connection hole for the heat exchange coil 15 to pass through. A wastewater inlet communicating with its inner cavity and a clean water inlet 16 connected to one end of the heat exchange coil 15 are provided on one side wall along the length of the wastewater tank 14. A wastewater outlet 7 communicating with its inner cavity and a clean water outlet 17 connected to the other end of the heat exchange coil 15 are provided on the other side wall of the wastewater tank 14. In this structure, hot wastewater enters the wastewater tank 14 through the wastewater inlet, passes through multiple chambers, and is discharged from the wastewater outlet 7. Clean water enters the heat exchange coil 15 through the water inlet and flows out through the clean water outlet 17. Inside the wastewater tank 14, the hot wastewater transfers heat to the heat exchange coil 15, preheating the clean water inside the heat exchange coil 15. The multiple chambers also slow down the circulation speed of the hot wastewater, improving heat exchange efficiency. Furthermore, multiple fins 18 can quickly absorb heat from the hot wastewater and then conduct it to the heat exchange coil 15, preheating the clean water. In the entire dishwasher's clean water circulation system, external tap water first undergoes heat exchange with hot wastewater through a wastewater heat recovery component for initial preheating. Then, it enters a heat pump unit for heat exchange with refrigerant, achieving a second preheating. Finally, it enters the main heating PTC heating component for heating. Because the clean water undergoes two preheating processes, the time required to heat to the preset temperature in the PTC heating component is shorter, resulting in lower energy consumption. According to experimental statistics, this double preheating process can save 50%-60% of energy consumption.

[0042] Specifically, in this embodiment, the wastewater tank 14 includes a box body with an opening at the top. Multiple symmetrical and vertically extending insertion slots are provided on the inner walls of the two side plates in the width direction of the box body. Multiple fins 18 are inserted and fitted into the corresponding insertion slots from top to bottom. The top of the box body is connected to a top plate, and the upper and lower ends of each fin 18 abut against the top plate and the bottom of the box body, respectively, so that the inner cavity of the wastewater tank 14 is divided into multiple independent chambers. Moreover, the size of the chambers can be customized and changed by adjusting the spacing of the fins 18 according to actual needs. Furthermore, the insertion form of the fins 18 simplifies the installation process. During assembly, it is convenient to connect the heat exchange coil 15 to each fin 18 first and then install it into the inner cavity of the wastewater tank 14 as a whole, thereby improving production efficiency.

[0043] Of course, in some other embodiments, each fin 18 can also be directly fixed to the inner wall of the wastewater tank 14 by welding or screwing.

[0044] Furthermore, in the above structure of this embodiment, the participants in the appendix Figure 5Each pair of adjacent fins 18 has staggered water passage holes 19. This arrangement can further extend the residence time of hot wastewater in the wastewater tank 14, so that heat can be better transferred to the clean water in the heat exchange coil 15, thereby improving the preheating effect. Preferably, multiple grooves and / or ridges are provided on the surface of each fin 18, which can improve the heat absorption efficiency of the fins 18 and improve the preheating efficiency of clean water from another perspective.

[0045] On another note, in the above structure, see Appendix Figure 6 The heat exchange coil 15 is one of a spiral coil, a serpentine coil, or a loop coil, and is formed by bending a metal corrugated tube. Preferably, a stainless steel corrugated tube is used to make the heat exchange coil 15. The inner wall of the corrugated tube has a corrugated structure, which increases the heat exchange area and improves efficiency compared to a straight-walled coil structure. In addition, the corrugated structure inside the corrugated tube makes the water flow in a turbulent state inside the tube, eliminating dead corners and making it less prone to scaling. To reduce heat loss, an additional layer of insulation cotton is added to the outside of the wastewater tank 14 in this embodiment.

[0046] For others, see Appendix Figure 7 and 8 In this embodiment, the PTC heating assembly includes a cylindrical body, which is sequentially divided along its length into an inlet chamber 21, a mixing chamber 22, and an outlet chamber 23. An inlet pipe 24 communicating with the inlet chamber 21 and an outlet pipe 25 communicating with the outlet chamber 23 are provided on the side wall of the cylindrical body. Water passages exist between adjacent chambers in the inlet chamber 21, mixing chamber 22, and outlet chamber 23. Additionally, a PTC heating pipe 20 is detachably connected to the cylindrical body, extending axially to the inlet chamber 21, mixing chamber 22, and outlet chamber 23. A first detection element 27 and a second detection element 28 are also connected to the side wall of the cylindrical body for respectively detecting the water temperature in the inlet chamber 21 and outlet chamber 23. Specifically, a corresponding controller is also set in the entire PTC heating assembly, and the first detection element 27, the second detection element 28, and the PTC heating tube 20 are all electrically connected to the controller. That is, when the first detection element 27 detects that the water temperature in the inlet chamber 21 is lower than the first set value, it will transmit a signal to the controller, and the controller will control the PTC heating tube 20 to start heating. When the second detection element 28 detects that the water temperature in the outlet chamber 23 is higher than the second set value, the second detection element 28 will feed back a signal to the controller, and the controller will control the PTC heating tube 20 to stop heating, thereby ensuring that the temperature of the outlet pipe 25 remains constant within a certain range.

[0047] Furthermore, in the above structure, the chamber inside the cylinder is divided into three areas: a low-temperature zone, a mixing zone, and a high-temperature zone. The high-temperature zone is equipped with a water outlet pipe 25 connected to the rinsing spray arm on the side wall of the cylinder, which ensures that the spray water temperature is constant within a certain range. At the same time as water is discharged from the water outlet pipe 25, cold water is added by the water inlet pipe 24. The added cold water does not directly mix into the high-temperature zone, but flows slowly into the mixing zone first. Therefore, the addition of external cold water will not cause excessive fluctuations in the temperature of the high-temperature zone. Moreover, when the temperature of the low-temperature zone drops below the first set value as cold water is added by the water inlet pipe 24, the PTC heating tube 20 will start working. Under the action of the second detection element 28, the PTC heating tube 20 will not heat continuously, but will stop heating when the temperature of the high-temperature zone reaches the second set value. This can better ensure the constant temperature of the water outlet pipe 25 with very small fluctuations.

[0048] In this embodiment, please refer again to the appendix. Figure 8 Two partition plates 29, spaced apart along the length of the inner wall of the cylinder, are connected to the inner wall of the cylinder. These two partition plates 29 are welded and fixed to the inner wall of the cylinder, dividing the inner cavity into an independent inlet chamber 21, a mixing chamber 22, and an outlet chamber 23. Each partition plate 29 has a first mounting hole in its center for the PTC heating element 20 to pass through. Each partition plate 29 also has multiple connecting holes 26 to form a water passage. Preferably, the connecting holes 26 are through holes with a diameter controlled between 0.5 and 1 cm. The area of ​​the water passage should not be too large to slow down the time it takes for cold water in the inlet chamber 21 to enter the mixing chamber 22 and the outlet chamber 23, thus preventing large fluctuations in the stability of the outlet chamber 23.

[0049] In this embodiment, preferably, the cylinder includes a hollow circular tube 30, with end caps 31 connected to both ends of the tube 30. Specifically, both end caps 31 are welded and fixed to both ends of the circular tube 30, and a second mounting hole for the PTC heating tube 20 to pass through is provided on either end cap 31. One end of the PTC heating tube 20 is connected to a connecting flange 32, which is detachably connected to the end cap 31 with the second mounting hole. This allows for a detachable connection between the PTC heating tube 20 and the cylinder, facilitating the removal of the PTC heating tube 20 for cleaning its outer wall and ensuring heating efficiency. More specifically, corresponding mounting holes are provided at the center of the two end caps 31 and the two partitions 29 to ensure that the PTC heating tube 20 is located in the center of the cylinder after installation, enabling it to heat the water in each chamber more evenly.

[0050] In addition, in the above structure, the first detection element 27 and the second detection element 28 are both cylindrical temperature probes, and the two temperature probes are connected along the direction of the vertical outer wall of the cylindrical tube 30. The detection ends of the two temperature probes extend through the side wall of the cylinder to the center of the water inlet chamber 21 and the water outlet chamber 23, respectively, so as to obtain the real-time water temperature of the water inlet chamber 21 and the water outlet chamber 23 more accurately.

[0051] In this embodiment, when the PTC heating component is working, the cylinder is horizontally arranged along its length and is connected and fixed to the dishwasher frame 11 by a corresponding fixed base on its exterior. The side wall at the bottom of the cylinder is also provided with a drain bolt 33 that communicates with any of the chambers. When the PTC heating component is not used for a long time, the water in the cylinder can be drained in time through the drain bolt 33, thereby improving the service life of the device.

[0052] On the other hand, see Appendix Figure 2 In this embodiment, the drying assembly includes a blower 34, an electric heating assembly 35, and a return air plate 36. The electric heating assembly 35 includes a housing with openings at both the top and bottom. The housing is inserted into a mounting hole on the top plate of the drying chamber. An electric heating unit is connected to the inner wall of the housing. The blower 34 is connected to the upper end of the housing, and the air outlet of the blower 34 is connected to the upper opening of the housing. An air knife is connected to the lower opening of the housing. The return air plate 36 is located on the bottom plate of the drying chamber and directly below the air knife. The air blower 34 outputs hot air, which is then turned into hot air after passing through the electric heating unit. The hot air is blown downwards by the air knife to remove water stains from the tableware, achieving a drying effect. At the same time, when the hot air reaches the return air plate 36 at the bottom of the drying chamber, some of the hot air is redirected back to the tableware to remove water stains, improving drying efficiency.

[0053] Participate in the attached Figure 2 More specifically, in the above structure, a sealed cavity is provided on the frame 1 above the drying cavity. The blower 34 and the electric heating assembly 35 are installed in the sealed cavity. At least one air intake channel 37 communicating with the drying cavity is provided at the bottom of the sealed cavity for hot air in the drying cavity to enter the sealed cavity. A second heat collection tube 13 is installed on the side wall of the sealed cavity. One end of the second heat collection tube 13 extends into the sealed cavity, and the other end is connected to the heat collection cover 11.

[0054] In this embodiment, see Appendix Figure 2 The return air plate 36 is composed of multiple V-shaped plates connected side by side. Preferably, the return air plate 36 is made by repeatedly bending a single piece of material. The bending structure allows the hot air blown down by the air knife to be redirected and its direction to be more diffused, that is, it can be redirected at multiple angles instead of a single straight up and down route, thus improving the drying effect.

[0055] In the description of this application, the references to terms such as "this embodiment," "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy-saving long-dragon type dishwasher, comprising a frame (1), a main washing chamber, a rinsing chamber and a drying chamber being arranged in sequence along the length direction of the frame (1), a conveying assembly for driving a washing basket loaded with tableware to pass through the main washing chamber, the rinsing chamber and the drying chamber in sequence being arranged on the frame (1), a main washing spray pipe (2) and a rinsing spray pipe (3) being arranged in the main washing chamber and the rinsing chamber respectively, characterized in that: The frame (1) is also equipped with a main water inlet pipe (24), a main washing water tank (4), a PTC heating component, a wastewater heat recovery component, and a heat pump device. The main washing spray pipe (2) is connected to the main washing water tank (4) through a pumping component. The bottom of the rinsing chamber is connected to the main washing water tank (4). The side wall of the main washing water tank (4) is provided with an overflow port (6) connected to the wastewater inlet (5) of the wastewater heat recovery component. The wastewater outlet (7) of the wastewater heat recovery component is connected to an external drain. The tap water in the main water inlet pipe (24) is heated by the wastewater heat recovery component, the heat pump device, and the PTC heating component in sequence and then connected to the rinsing spray pipe (3). The drying chamber is equipped with a drying component for removing water stains from the surface of tableware.

2. The energy-saving long-line dishwasher according to claim 1, characterized in that: The heat pump device includes an evaporator (8), a heat exchanger, and a compressor (10) that are connected to each other. The evaporator (8) is located at the top of the rinsing chamber, and the lower end of the evaporator (8) is provided with a heat collection hood (11) with a lower opening. The frame (1) is also provided with a first heat collection pipe (12) for collecting the steam in the main washing chamber and the rinsing chamber to the heat collection hood (11), and a second heat collection pipe (13) for collecting the hot air in the drying chamber to the heat collection hood (11).

3. The energy-saving long-line dishwasher according to claim 1, characterized in that: The wastewater heat recovery assembly includes a wastewater tank (14) and a heat exchange coil (15). The wastewater tank (14) has a wastewater inlet (5) communicating with its inner cavity and a clean water inlet (16) connected to one end of the heat exchange coil (15) on one side wall along its length. The wastewater tank (14) has a wastewater outlet (7) communicating with its inner cavity and a clean water outlet (17) connected to the other end of the heat exchange coil (15) on the other side wall. The outlet end of the main water inlet pipe (24) is connected to the clean water inlet (16), and the clean water outlet (17) is connected to the heat pump device.

4. The energy-saving long-line dishwasher according to claim 3, characterized in that: The wastewater tank (14) is also provided with a plurality of fins (18) arranged at intervals along its length. The plurality of fins (18) are used to divide the wastewater tank (14) into a plurality of chambers, and the chambers are interconnected. Each fin (18) is provided with a connection hole for the heat exchange coil (15) to pass through.

5. The energy-saving long-line dishwasher according to claim 4, characterized in that: Each pair of adjacent fins (18) has water passage holes (19) that are staggered vertically, and each fin (18) has multiple grooves and / or protrusions on its surface.

6. The energy-saving long-line dishwasher according to any one of claims 1 to 5, characterized in that: The PTC heating assembly includes a cylinder and a PTC heating tube (20). The cylinder is divided along its length into an inlet chamber (21), a mixing chamber (22), and an outlet chamber (23). The side wall of the cylinder is provided with an inlet pipe (24) communicating with the inlet chamber (21) and an outlet pipe (25) communicating with the outlet chamber (23). Adjacent chambers in the inlet chamber (21), mixing chamber (22), and outlet chamber (23) have water passages. The PTC heating tube (20) is connected to the inlet chamber... The cylinder is detachably connected and extends axially to the water inlet chamber (21), the mixing chamber (22), and the water outlet chamber (23); the side wall of the cylinder is also connected to a first detection element (27) and a second detection element (28) for detecting the water temperature of the water inlet chamber (21) and the water outlet chamber (23) respectively; when the water temperature in the water inlet chamber (21) is lower than the first set value, the PTC heating tube (20) starts heating, and when the water temperature in the water outlet chamber (23) is higher than the second set value, the PTC heating tube (20) stops heating.

7. The energy-saving long-line dishwasher according to claim 6, characterized in that: The inner wall of the cylinder is connected to two partitions (29) spaced apart along its length, which are used to divide the inner cavity of the cylinder into a water inlet chamber (21), a mixing chamber (22) and a water outlet chamber (23). The middle of each of the two partitions (29) is provided with a first mounting hole for the PTC heating tube (20) to pass through, and each partition (29) is also provided with a plurality of connecting holes (26) to form the water passage.

8. The energy-saving long-line dishwasher according to claim 6, characterized in that: The cylinder includes a hollow circular tube (30), and end caps (31) are connected to both ends of the circular tube (30). A second mounting hole is provided on any one of the end caps (31) for the PTC heating tube (20) to pass through. A connecting flange (32) is connected to one end of the PTC heating tube (20). The connecting flange (32) is detachably connected to the end cap (31) with the second mounting hole.

9. The energy-saving long-line dishwasher according to claim 1, characterized in that: The drying assembly includes a blower (34), an electric heating assembly (35), and a return air plate (36). The electric heating assembly (35) includes a housing with openings at both the top and bottom. The housing is inserted into a mounting through hole on the top plate of the drying chamber. An electric heating unit is connected to the inner wall of the housing. The blower (34) is connected to the upper end of the housing, and the air outlet of the blower (34) is connected to the upper opening of the housing. An air knife is connected to the lower opening of the housing. The return air plate (36) is located on the bottom plate of the drying chamber and directly below the air knife.

10. The energy-saving long-line dishwasher according to claim 9, characterized in that: The return air plate (36) is composed of multiple V-shaped plates connected side by side.

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