Energy-saving long-dragon-type dish washing machine

Abstract

The invention provides an energy-saving long dragon type dishwasher which comprises a rack, a main washing cavity, a rinsing cavity, a drying cavity, a conveying assembly, a PTC heating assembly, a waste water heat recovery assembly and a heat pump device are arranged on the rack, a main washing spraying pipe is communicated with a main washing water tank through a pumping assembly, and the bottom of the rinsing cavity is communicated to the main washing water tank; an overflow port communicated with a waste water inlet of the waste water heat recovery assembly is formed in the side wall of the main washing water tank, a waste water outlet of the waste water heat recovery assembly is communicated to an external water outlet, and tap water in the main water inlet pipe is sequentially heated by the waste water heat recovery assembly, the heat pump device and the PTC heating assembly and then is communicated to the rinsing spraying pipe; a drying assembly used for removing water stains on the surfaces of the tableware is arranged in the drying cavity. According to the energy-saving long-dragon-type dish washing machine, waste hot water and steam waste heat are recycled, heat is transferred to tap water, the preheated tap water enters the main heating assembly, the heating time is short, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial dishwashers, in particular to an energy-saving long-draft dishwasher. Background Art

[0002] Commercial dishwashers are a new type of kitchen dishwashing equipment, primarily used in kitchens with high dishwashing volumes, such as schools, hotels, businesses, military units, and dishwashing companies. Compared to manual cleaning, commercial dishwashers offer advantages such as higher cleaning efficiency, reduced labor costs, and a solution to tableware shortages.

[0003] Commercial dishwashers are primarily categorized as undercounter dishwashers, hood-type dishwashers, conveyor-type dishwashers, and energy-saving long-haul dishwashers. Energy-saving long-haul dishwashers typically include multiple chambers, which can be divided into a main wash chamber, a rinse chamber, and a drying chamber along the direction of the dishes' movement. During the main wash process, the main wash pump draws water from the main wash tank and sprays it directly onto the dishes through the main spray arm, removing food residue and grease from the dishes. After rinsing the dishes, the main wash water then returns to the main wash tank, allowing for recycling. During the rinsing process, tap water enters the dishwasher's main heating pack and is heated by a high-power heating tube, rapidly reaching a temperature above 80°C. The high-temperature water from the main heating pack is then sprayed onto the dishes through the rinse spray arm before finally entering the main wash tank.

[0004] Existing Changlong dishwashers typically use external rinse water directly in a heating pack before being sprayed on dishes via a spray arm. This method takes a long time to heat the water from room temperature to over 80°C, resulting in high energy consumption. Furthermore, any excess hot water from the main wash tank is directly discharged into the sewer, preventing the full utilization of wastewater and steam heat, resulting in a waste of resources. Summary of the Invention

[0005] In order to overcome at least one of the above-mentioned defects in the prior art, the present invention provides an energy-saving long-draft dishwasher that can recover existing waste hot water and steam waste heat and transfer the heat to tap water, so that the tap water has been preheated multiple times before entering the main heating package for heating, thereby effectively reducing the heating time of the main heating package and saving energy consumption.

[0006] The technical solution adopted by the present invention is to provide an energy-saving long-type dishwasher, including a frame, on which a main wash chamber, a rinsing chamber and a drying chamber are sequentially arranged along the length direction thereof, and a conveying assembly for driving a washing basket loaded with tableware to pass through the main wash chamber, the rinsing chamber and the drying chamber in sequence is also provided on the frame, a main wash spray pipe and a rinsing spray pipe are respectively provided in the main wash chamber and the rinsing chamber, and a main water inlet pipe, a main wash water tank, a PTC heating assembly, a wastewater heat recovery assembly and a heat pump device are also provided on the frame, The main wash spray pipe is connected to the main wash water tank through a pumping component, 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 component, the wastewater outlet of the wastewater heat recovery component is connected to the external drain port, the tap water in the main water inlet pipe is heated in turn by the wastewater heat recovery component, the heat pump device and the PTC heating component and then connected to the rinsing spray pipe, and a drying component for removing water stains on the surface of tableware is provided in the drying chamber.

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

[0008] Furthermore, the wastewater heat recovery component includes a wastewater tank and a heat exchange coil, and a wastewater inlet connected to its inner cavity and a clean water inlet connected to one end of the heat exchange coil are provided on one side wall of the wastewater tank in the longitudinal direction, and a wastewater outlet connected to its inner cavity and a clean water outlet connected to the other end of the heat exchange coil are provided on the other side wall of the wastewater tank; the water 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 waste water tank is further provided with a plurality of fins arranged at intervals along its length direction, and the plurality of fins are used to divide the waste water tank into a plurality of chambers, and the chambers are interconnected; each fin is provided with a connecting hole for the heat exchange coil to pass through.

[0010] As a further improvement, each two adjacent fins are sequentially provided with water-through holes that are staggered up and down, and a plurality of grooves and / or ridges are provided on the surface of each fin.

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

[0012] Furthermore, two partitions are connected to the inner wall of the cylinder and are arranged at intervals along its length direction to divide the inner cavity of the cylinder into a water inlet chamber, a mixing chamber and a water outlet chamber. A first mounting hole for the PTC heating tube to pass through is provided in the middle of the two partitions, and each partition is also provided with a plurality of connecting holes to form the water passage.

[0013] Furthermore, the cylinder includes a hollow circular tube, both ends of which are respectively connected to end cover plates, and any one of the end cover plates is provided with 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, and the connecting flange is detachably connected to the end cover plate with the second mounting hole.

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

[0015] Preferably, the return air plate is formed by connecting a plurality of V-shaped plates side by side.

[0016] Compared with the prior art, the energy-saving long-draft dishwasher of the present invention has the following advantages: 1. A wastewater heat recovery component and a heat pump device are added to the dishwasher's main frame. Before entering the PTC heating component, the external tap water passes through the wastewater heat recovery component for the first heat exchange with waste hot water, and then passes through the heat pump component for the second heat exchange with the refrigerant. After two heat exchanges and heating, the tap water enters the main heating PTC heating component for final heating. Since the tap water has been 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 can save 50%-60% of energy consumption.

[0017] 2. In the heat pump device, the evaporator is used to absorb the heat of the hot air in the heat collecting cover and transfer the heat to the refrigerant. The high-temperature and high-pressure refrigerant transfers the 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 waste water hot air in the main washing chamber and the rinsing chamber being absorbed by the heat collecting cover, the high-temperature gas in the drying chamber is also absorbed by the heat collecting cover, effectively improving the waste heat utilization efficiency.

[0018] 3. Multiple fin structures are added to the wastewater tank. The multiple fins divide the inner cavity of the wastewater tank into multiple interconnected chambers. This effectively prolongs the retention time of the hot wastewater in the wastewater tank, allowing the clean water in the heat exchange tube to better exchange heat with the hot wastewater, improving the preheating effect, thereby reducing the heating time of the subsequent main heating link and reducing energy consumption. The fins themselves can also quickly absorb the heat of the hot wastewater and then transfer it to the heat exchange tube to heat the clean water. The second heat exchange coil is made of a metal bellows structure. Compared with the straight-wall coil structure, it increases the heat exchange area and improves efficiency. In addition, the corrugated structure inside the bellows makes the water flow in the tube "turbulent", without dead corners, and is not easy to scale. 4. The dishwasher structure also improves the heating unit, using PTC heating tubes for heating. Its heat energy conversion efficiency can reach 99%, which is about 25% higher than the heating efficiency of the old resistance wire heating tube of about 75%. The PTC heating tube has the characteristic of preventing dry burning and is not easy to damage. When the cylinder is filled with water, it starts to heat up until it reaches the required temperature, and then the outlet pipe releases high-temperature water for use. The entire device is divided into three areas by a perforated spacer: low-temperature zone, mixed zone, and high-temperature zone. When the temperature read by the temperature probe in the low-temperature zone is lower than a certain temperature value, the PTC heating tube starts to work and heat up. When the temperature in the high-temperature zone is higher than a certain temperature value, the PTC heating tube stops heating, thereby saving energy. In addition, this structure can keep the temperature of the water outlet pipe constant within a certain range.

[0019] Other improved features and advantages of the present invention will be described in the following detailed description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the energy-saving long-draft dishwasher of the present invention; Figure 2 A perspective view of the energy-saving long-draft dishwasher of the present invention from another angle; Figure 3 A perspective view of the energy-saving long-draft dishwasher of the present invention from another angle; Figure 4 is a structural diagram of the wastewater heat recovery device of the present invention; Figure 5 This is a structural diagram of the wastewater heat recovery device of the present invention when the shell is not installed; Figure 6 for Figure 5 Another angle diagram of the structure; Figure 7 This is a structural diagram of the PTC heating component in the present invention; Figure 8 It is a cross-sectional view of the PTC heating component in the present invention.

[0021] Description of reference numerals: 1. Frame; 2. Main wash spray pipe; 3. Rinse spray pipe; 4. Main wash water tank; 5. Wastewater inlet; 6. Overflow port; 7. Wastewater outlet; 8. Evaporator; 9. Heat exchanger; 10. Compressor; 11. Heat collecting cover; 12. First heat collecting tube; 13. Second heat collecting tube; 14. Wastewater tank; 15. Heat exchange coil; 16. Clean water inlet; 17. Clean water outlet; 18. Fins; 19. Water through hole; 20. PTC heating tube 21. Water inlet chamber; 22. Mixing chamber; 23. Water outlet chamber; 24. Water inlet pipe; 25. Water outlet pipe; 26. Connecting hole; 27. First detection element; 28. Second detection element; 29. ​​Partition; 30. Circular tube; 31. End cover; 32. Connecting flange; 33. Drain bolt; 34. Blower; 35. Electric heating assembly; 36. Return air plate; 37. Intake channel; 38. Exhaust fan; 39. Exhaust duct; DETAILED DESCRIPTION

[0022] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0023] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "fixed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0024] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figures 1 to 8 As shown, the embodiment of the present application discloses an energy-saving long dragon type dishwasher, including a frame 1, on which a main wash chamber, a rinsing chamber and a drying chamber are sequentially arranged along its length direction, and the main wash chamber, the rinsing chamber and the drying chamber are connected to each other in the length direction of the frame 1, and a tableware inlet is provided at one end of the frame 1 close to the main wash 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 direction, that is, the tableware enters the dishwasher from the feed inlet and then passes through the main wash chamber, the rinsing chamber and the drying chamber in sequence under the driving action of the conveying assembly and is finally transferred from the discharge port to the transfer box; the conveying assembly here is a conventional structure, generally including a driving shaft, a driven shaft and a driving motor, the driving motor is used to drive the driving shaft to rotate, the driving shaft and the driven shaft are respectively connected to the two ends of the frame 1, and a conveyor belt is sleeved on the outside of the driving shaft and the driven shaft, and the conveyor belt is provided with limiting teeth for positioning the tableware.

[0026] In addition, a main wash spray pipe 2 and a rinse spray pipe 3 are respectively provided in the main wash chamber and the rinse chamber. The frame 1 is also provided 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 is connected to the main wash water tank 4 through a pumping component. Specifically, a water pump and a pipeline are set 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 washing of the tableware; the tableware after the main wash then enters the rinse chamber and is rinsed with high-temperature clean water through the rinse spray pipe 3, and the bottom of the rinse chamber is connected to the main wash water tank, and the waste water after rinsing is converged into the main wash water tank 4 to save water resources.

[0027] Furthermore, an overflow port 6 connected to the wastewater inlet of the wastewater heat recovery component is provided on the side wall of the main wash water tank 4, and the wastewater outlet 7 of the wastewater heat recovery component is connected to the external drain port. The tap water in the main water inlet pipe 24 is heated in turn by the wastewater heat recovery component, the heat pump device and the PTC heating component and then connected to the rinsing spray pipe 3. A drying component for removing water stains on the surface of tableware is provided in the drying chamber.

[0028] In the above structure, the water flow path is: external clean tap water (water temperature is about 20 degrees) first enters the wastewater heat recovery component along the main water inlet pipe 24, and performs the first heat exchange with the high-temperature wastewater. The water temperature can be raised to about 40-45 degrees. Then the tap water continues to enter the heat pump device through the pipeline for heat exchange. The water temperature rises to about 70-75 degrees again. Finally, the tap water enters the PTC heating component for heating. The tap water temperature is heated to about 90-95 degrees. Finally, the tap water heated to the set temperature enters the rinse spray pipe 3 to perform high-temperature rinsing on the tableware passing through the rinsing chamber. Compared with the traditional external tap water directly heated to the required temperature by the PTC heating component, it not only effectively reduces the heating time, but also greatly saves energy consumption and saves costs.

[0029] In this embodiment, see the attached Figure 2 The heat pump device includes an interconnected evaporator 8, a heat exchanger, and a compressor 10. Evaporator 8 is located at the top of the rinse chamber, and a heat collection cover 11 with a lower opening is provided at its lower end. The frame 1 is also provided with a first heat collection pipe 12 for collecting steam from the main wash and rinse chambers into the heat collection cover 11, and a second heat collection pipe 13 for collecting hot air from the drying chamber into the heat collection cover 11. The heat pump device recycles waste heat from the dishwasher's interior. Evaporator 8 absorbs heat and transfers it to the refrigerant. The high-temperature, high-pressure refrigerant transfers heat energy to tap water flowing through the heat pump in the heat exchanger, raising the water's temperature. In this structure, not only is the heat from the wastewater in the main wash and rinse chambers absorbed into the heat collection cover 11, but the high-temperature air from the drying chamber is also absorbed into the heat collection cover 11, effectively improving waste heat utilization efficiency.

[0030] In the above structure, see the attached Figure 2 、 3 A connecting hole 26 is provided on the side of the top plate of the main washing chamber near the tableware inlet. An exhaust fan 38 and an exhaust duct 39 are connected above the top plate of the main washing chamber. The inlet of the exhaust duct 39 is connected to the connecting hole 26, and the outlet is connected to the first heat collecting pipe 12, which is used to absorb the hot air in the main washing chamber and the rinsing chamber into the heat collecting cover 11 to realize heat exchange with the evaporator 8, and use steam preheating to preheat the tap water flowing through the heat pump device.

[0031] In this embodiment, see the attached Figure 4 、 5and 6, a wastewater heat recovery assembly comprising a rectangular wastewater tank 14, a heat exchange coil 15, and a plurality of fins 18 spaced apart along the length of the wastewater tank 14, wherein the plurality of fins 18 are used to divide the inner cavity of the wastewater tank 14 into a plurality of 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 in the length direction of the wastewater tank 14, and 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 wastewater tank 14 from the wastewater inlet, passes through multiple chambers, and is discharged from wastewater outlet 7. Clean water enters heat exchange coil 15 from the water inlet and flows out from clean water outlet 17. Within wastewater tank 14, the hot wastewater transfers heat to heat exchange coil 15, preheating the clean water within heat exchange coil 15. The multiple chambers slow the circulation of the hot wastewater and improve heat exchange efficiency. Furthermore, the multiple fins 18 quickly absorb heat from the hot wastewater and transfer it to heat exchange coil 15, preheating the clean water. That is, in the entire dishwasher clean water circulation system, the external tap water first passes through the wastewater heat recovery component to exchange heat with the hot wastewater to achieve the first preheating, then enters the heat pump device to exchange heat with the refrigerant to achieve the second heating preheating, and finally enters the main heating PTC heating component to achieve heating. Since the clean water has been preheated twice, the time required to heat to the preset temperature in the PTC heating component is shorter and the energy consumption is lower. According to experimental statistics, this double preheating can save 50%-60% of energy consumption.

[0032] Specifically, in this embodiment, the waste water tank 14 includes a box body with an upper opening, and a plurality of mutually 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. A plurality of fins 18 are respectively inserted and fitted in the corresponding insertion slots from top to bottom, and the top of the box body is connected to a top plate, and the upper and lower ends of each fin 18 are respectively abutted against the top plate and the bottom of the box body, so that the inner cavity of the waste water tank 14 is divided into a plurality of independent chambers, and the volume of the chamber can be customized. The interval between the fins 18 can be adjusted according to actual needs, and the insertion form of the fins 18 simplifies the installation process. During assembly, it is convenient to first connect the heat exchange coil 15 with the fins 18 and then install the entire heat exchange coil into the inner cavity of the waste water tank 14, thereby improving production efficiency.

[0033] Of course, in some other embodiments, each fin 18 may also be directly fixed to the inner wall of the wastewater tank 14 by welding or screwing.

[0034] In addition, in the above structure of this embodiment, the attached Figure 5, each two adjacent fins 18 are sequentially provided with water-passing holes 19 that are staggered up and down. This arrangement can further extend the retention time of the hot waste water in the waste water tank 14, so that the heat can be better transferred to the clean water in the heat exchange coil 15, thereby improving the preheating effect; preferably, a plurality of grooves and / or ridges are provided on the surface of each fin 18, which can improve the efficiency of the fin 18 in absorbing heat, thereby improving the clean water preheating efficiency from another angle.

[0035] On the other hand, in the above structure, see the attached Figure 6 The heat exchange coil 15 is a spiral coil, a serpentine coil, or a meandering coil, and is formed by bending a metal bellows. Preferably, a stainless steel bellows is used to form the heat exchange coil 15. The inner wall of the bellows has a corrugated structure, which increases the heat exchange area and improves efficiency compared to a straight-walled coil structure. Furthermore, the internal corrugation of the bellows creates a turbulent flow within the tube, eliminating dead corners and preventing scaling. To reduce heat loss, a layer of insulation is added to the exterior of the wastewater tank 14 in this embodiment.

[0036] In addition, see the attached Figure 7 and 8 The PTC heating component in this embodiment includes a cylinder, which is divided into a water inlet chamber 21, a mixing chamber 22 and a water outlet chamber 23 in sequence along its length direction, and a water inlet pipe 24 communicating with the water inlet chamber 21 and a water outlet pipe 25 communicating with the water outlet chamber 23 are provided on the side wall of the cylinder, and there are water passages between adjacent chambers in the water inlet chamber 21, the mixing chamber 22 and the water outlet chamber 23; in addition, a PTC heating tube 20 extending axially to the water inlet chamber 21, the mixing chamber 22 and the water outlet chamber 23 is detachably connected to the cylinder, and a first detection element 27 and a second detection element 27 for respectively detecting the water temperature of the water inlet chamber 21 and the water outlet chamber 23 are connected to the side wall of the cylinder. The first detecting element 27, the second detecting element 28 and the PTC heating tube 20 are all connected to the controller with electrical signals; that is, when the first detecting element 27 detects that the water temperature in the water inlet chamber 21 is lower than the first set value, the signal will be transmitted to the controller, and the controller controls the PTC heating tube 20 to start heating, and when the second detecting element 28 detects that the water temperature in the water outlet chamber 23 is higher than the second set value, the second detecting element 28 feeds back the signal to the controller, and the controller controls the PTC heating tube 20 to stop heating, thereby ensuring that the temperature of the water outlet pipe 25 always remains constant within a certain range.

[0037] In addition, in the above structure, the chamber in the cylinder is divided into three areas, namely, a low-temperature zone, a mixing zone and a high-temperature zone. A water outlet pipe 25 connected to the rinsing spray arm is provided on the side wall of the cylinder corresponding to the high-temperature zone, so as to ensure that the spray water temperature is constant within a certain range, and while water is discharging from the water outlet pipe 25, the water inlet pipe 24 will replenish cold water. The replenished cold water will not be directly mixed into the high-temperature zone, but will first slowly flow into the mixing zone, so the external cold water replenishment will not cause excessive fluctuations in the temperature of the high-temperature zone; and, as cold water is replenished in the water inlet pipe 24, when the temperature in the low-temperature zone becomes lower than the first set value, the PTC heating tube 20 will start working, and under the action of the second detection element 28, the PTC heating tube 20 will not continue to heat, but will stop heating when the high-temperature zone stabilizes and reaches the second set value, thereby better ensuring the constancy of the temperature of the water outlet pipe 25 and a very small fluctuation range.

[0038] In this embodiment, see again the attached Figure 8 Two partitions 29 are connected to the inner wall of the cylinder, spaced apart along its length. The two partitions 29 are welded to the inner wall of the cylinder and serve to separate the inner cavity of the cylinder into a mutually independent water inlet chamber 21, a mixing chamber 22, and a water outlet chamber 23. A first mounting hole for the PTC heating tube 20 is provided in the middle of each partition 29. Each partition 29 also has multiple connecting holes 26 to form a water passage. Preferably, the connecting holes 26 are circular through-holes with a diameter of 0.5 to 1 cm. The area of ​​the water passage should not be too large, slowing down the time it takes for cold water in the water inlet chamber 21 to enter the mixing chamber 22 and the water outlet chamber 23, and preventing large fluctuations in the stability of the water outlet chamber 23.

[0039] In this embodiment, preferably, the cylinder includes a hollow circular tube 30, and the two ends of the circular tube 30 are respectively connected to end cover plates 31. Specifically, the two end cover plates 31 are welded and fixed to the two ends of the circular tube 30, and a second mounting hole for the PTC heating tube 20 to pass through is opened on any end cover plate 31, and one end of the PTC heating tube 20 is connected to a connecting flange 32. The connecting flange 32 is detachably connected to the end cover plate 31 with the second mounting hole, thereby realizing a detachable connection between the PTC heating tube 20 and the cylinder, making it convenient to remove the PTC heating tube 20 for cleaning its outer wall and ensuring heating efficiency. More specifically, corresponding mounting holes are set at the center positions of the two end cover plates 31 and the two partitions 29 to ensure that the PTC heating tube 20 is located at the center position of the cylinder after installation, so that it can heat the water in each chamber more evenly.

[0040] 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 outer wall of the vertical circular tube 30, and the detection ends of the two temperature probes respectively extend through the side walls of the cylinder to the center positions of the water inlet chamber 21 and the water outlet chamber 23, so as to more accurately obtain the real-time water temperature of the water inlet chamber 21 and the water outlet chamber 23.

[0041] In this embodiment, when the PTC heating component is working, the cylinder is arranged horizontally along its length direction and is fixed to the frame 11 of the dishwasher by providing a corresponding fixed base on its exterior. A drain bolt 33 communicating with any chamber is also provided on the side wall at the bottom of the cylinder. 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 increasing the service life of the device.

[0042] On the other hand, see the attached Figure 2 The drying assembly involved in this embodiment includes a blower 34, an electric heating assembly 35, and a return air plate 36. The electric heating assembly 35 includes a shell with upper and lower openings. The shell is inserted into the mounting hole on the top plate of the drying chamber. The inner wall of the shell is connected to the electric heating unit. The blower 34 is connected to the upper end of the shell, and the air outlet of the blower 34 is connected to the upper opening of the shell. The lower open end of the shell is connected to the wind knife. The return air plate 36 is located on the bottom plate of the drying chamber and directly below the wind knife. The air discharged by the blower 34 is converted into hot air after passing through the electric heating unit. The hot air is swept downward by the wind knife to blow away water stains on the tableware to achieve a drying effect. At the same time, when the hot air blows onto the return air plate 36 at the bottom of the drying chamber, part of the hot air is returned to the tableware to blow away water stains, thereby improving drying efficiency.

[0043] Participate in the Figure 2 In the above structure, more specifically, a sealed chamber is provided on the frame 1 above the drying chamber, a blower fan 34 and an electric heating assembly 35 are installed in the sealed chamber, and at least one suction channel 37 connected to the drying chamber is provided at the bottom of the sealed chamber for supplying hot air in the drying chamber to enter the sealed chamber; and a second heat collecting pipe 13 is installed on the side wall of the sealed chamber, one end of the second heat collecting pipe 13 extends into the sealed chamber, and the other end is connected to the heat collecting cover 11.

[0044] In this embodiment, see the attached Figure 2 The return air plate 36 is made of multiple V-shaped plates connected side by side. Preferably, the return air plate 36 is made of a single piece of plate that is repeatedly bent. The bending structure can make the hot air blown by the wind knife return in a more diffuse direction, that is, it can return in multiple angles instead of a single straight up and down route, thereby improving the drying effect.

[0045] In the description of this application, the description with reference to the terms "this embodiment", "some embodiments", etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are mutually inconsistent.

[0046] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An energy-saving long-type dishwasher, comprising a frame (1), wherein a main wash chamber, a rinse chamber, and a drying chamber are sequentially arranged on the frame (1) along its length direction, and a conveying assembly is further provided on the frame (1) for driving a washing basket containing tableware to pass through the main wash chamber, the rinse chamber, and the drying chamber in sequence, wherein a main wash spray pipe (2) and a rinse spray pipe (3) are respectively provided in the main wash chamber and the rinse chamber, and characterized in that: The frame (1) is further provided 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) is connected to the main wash water tank (4) via a pumping component; the bottom of the rinse chamber is connected to the main wash water tank (4); and an overflow port (6) is provided on the side wall of the main wash water tank (4) and is 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 port; 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 rinse spray pipe (3); and a drying component for removing water stains on the surface of tableware is provided in the drying chamber.

2. The energy-saving long-drain dishwasher according to claim 1, characterized in that: The heat pump device comprises 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 a heat collecting cover (11) with a lower opening is provided at the lower end of the evaporator (8). The frame (1) is also provided with a first heat collecting pipe (12) for collecting the steam in the main washing chamber and the rinsing chamber to the heat collecting cover (11), and a second heat collecting pipe (13) for collecting the hot air in the drying chamber to the heat collecting cover (11).

3. The energy-saving long-drain dishwasher according to claim 1, characterized in that: The wastewater heat recovery component comprises a wastewater tank (14) and a heat exchange coil (15); a wastewater inlet (5) communicating with the inner cavity of the wastewater tank (14) and a clean water inlet (16) connected to one end of the heat exchange coil (15) are provided on one side wall in the longitudinal direction of the wastewater tank (14); a wastewater outlet (7) communicating with the inner cavity of the wastewater tank (14) and a clean water outlet (17) connected to the other end of the heat exchange coil (15) are provided on the other side wall; the water 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-drain dishwasher according to claim 3, characterized in that: The waste water tank (14) is further provided with a plurality of fins (18) arranged at intervals along its length direction. The plurality of fins (18) are used to separate the waste water tank (14) into a plurality of chambers, and the chambers are interconnected. Each of the fins (18) is provided with a connection hole for the heat exchange coil (15) to pass through.

5. The energy-saving long-drain dishwasher according to claim 4, characterized in that: Each of the two adjacent fins (18) is sequentially provided with water-through holes (19) that are staggered up and down, and a plurality of grooves and / or ridges are provided on the surface of each of the fins (18).

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

7. The energy-saving long-drain dishwasher according to claim 6, characterized in that: Two partitions (29) are connected to the inner cavity wall of the cylinder and are arranged at intervals along its length direction to divide the inner cavity of the cylinder into a water inlet cavity (21), a mixing cavity (22) and a water outlet cavity (23). The middle parts of the two partitions (29) are each 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-drain dishwasher according to claim 6, characterized in that: The cylinder comprises a hollow circular tube (30), both ends of the circular tube (30) are respectively connected to end cover plates (31), any one of the end cover plates (31) is provided with a second mounting hole for the PTC heating tube (20) to pass through, and one end of the PTC heating tube (20) is connected to a connecting flange (32), and the connecting flange (32) is detachably connected to the end cover plate (31) having the second mounting hole.

9. The energy-saving long-drain dishwasher according to claim 1, characterized in that: The drying component includes a blower (34), an electric heating component (35) and a return air plate (36), the electric heating component (35) includes a shell with upper and lower ends opened, the shell is inserted into the mounting hole on the top plate of the drying chamber, the inner wall of the shell is connected to the electric heating unit, the blower (34) is connected to the upper end of the shell, and the air outlet of the blower (34) is connected to the upper opening of the shell, the lower open end of the shell is connected to the air knife, and 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-drain dishwasher according to claim 9, characterized in that: The return air plate (36) is formed by connecting a plurality of V-shaped plates in parallel.

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