Heat pump dish-washing machine defrosting device, commercial heat pump dish-washing machine and defrosting method

Abstract

The invention discloses a heat pump dish-washing machine defrosting device, a commercial heat pump dish-washing machine and a defrosting method, and belongs to the technical field of dish-washing machines. A defrosting device of a heat pump dish-washing machine comprises fixing columns, a plurality of parallel hot air pipes are arranged between the fixing columns, the hot air pipes are connected with a shell of a compressor through ventilation pipes, hot air generated by working of the compressor enters the hot air pipes through the ventilation pipes, and a plurality of nozzles facing evaporator fins are evenly arranged on the hot air pipes. The hot air pipe blows to fins of the evaporator through the nozzle to defrost the evaporator; a lifting mechanism for driving the hot air pipes to lift along the fixed column is arranged on the fixed column, and the height of the hot air pipes and the distance between the hot air pipes are adjusted through the lifting mechanism; a swing mechanism for driving the hot air pipe to swing is arranged on the fixing column and drives the nozzle to swing through the hot air pipe so as to defrost the evaporator. By the adoption of the heat pump dish-washing machine defrosting device, the commercial heat pump dish-washing machine and the defrosting method, the problem that the water heating efficiency is affected due to the fact that the power of a compressor needs to be reduced when an existing heat pump dish-washing machine is used for defrosting can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dishwashers, in particular to a defrosting device for a heat pump dishwasher, a commercial heat pump dishwasher and a defrosting method. BACKGROUND

[0002] As a common kitchen appliance in modern life, dishwashers greatly improve the efficiency of dish cleaning and reduce the household burden of people, and have gradually become an indispensable device in families and commercial places. The traditional dishwasher usually adopts electric heating or gas heating when heating the washing water and drying the dishes. The electric heating method is simple and direct, which converts electric energy into heat energy through an electric heating element to heat the washing water. However, for large commercial dishwashers, the water consumption is very large, and the electric heating method requires a large amount of electricity, resulting in high electricity cost. Although the gas heating method can reduce energy cost to some extent, it has installation and use limitations, needs a special gas pipeline connection, and has certain safety risks in the use process.

[0003] The prior art 202311342325.3 discloses a heat pump commercial dishwasher and a defrosting method thereof. The commercial dishwasher includes a rolling channel and a heat pump heating system. The double exhaust compressor of the heat pump heating system has an air inlet, a high-pressure exhaust port and a medium-pressure exhaust port. The high-pressure exhaust port is sequentially connected with an oil separator, a high-temperature heat exchanger, a medium-temperature heat exchanger, a high-pressure electronic expansion valve and an air-cooled evaporator. The medium-pressure exhaust port is sequentially connected with a second refrigerant channel of the medium-temperature heat exchanger, a medium-pressure electronic expansion valve and the air-cooled evaporator. The medium-temperature heat exchanger and the high-temperature heat exchanger heat water to provide heating for the cleaning section and the rinsing section. The air-cooled evaporator is connected with the air inlet of the double exhaust compressor. The double exhaust compressor, the oil separator and the air-cooled evaporator are arranged outdoors. The defrosting method is performed by cooperation of a cold storage tank, a solenoid valve and a low-pressure electronic expansion valve. The above patent uses high-temperature and high-pressure liquid refrigerant inside the compressor to defrost the evaporator, which needs to reduce the power of the compressor, affecting the efficiency of water heating. SUMMARY

[0004] The present application aims to provide a defrosting device for a heat pump dishwasher, a commercial heat pump dishwasher and a defrosting method, which solves the problem of reducing the power of the compressor for defrosting the existing heat pump dishwasher, affecting the efficiency of water heating.

[0005] In order to achieve the above object, the application provides a defrosting device for a heat pump dishwasher, comprising fixing columns, a plurality of parallel heat pipes arranged between the fixing columns, the heat pipes being connected with the shell of a compressor through air pipes, hot air generated by the compressor entering the heat pipes through the air pipes, a plurality of nozzles being evenly arranged on the heat pipes and facing the fins of an evaporator, the heat pipes blowing towards the fins of the evaporator through the nozzles to defrost the evaporator; a lifting mechanism being arranged on the fixing columns to drive the heat pipes to ascend and descend along the fixing columns, the height of the heat pipes and the distance between the heat pipes being adjusted through the lifting mechanism; a swinging mechanism being arranged on the fixing columns to drive the heat pipes to swing, the swinging mechanism driving the nozzles to swing through the heat pipes to defrost the evaporator.

[0006] Preferably, two fixing columns are arranged, the heat pipes are arranged between the two fixing columns, the fixing columns are arranged on both sides of one end of the evaporator, the heat pipes are arranged in front of the fins of the evaporator, and a base is fixedly arranged at the bottom of the fixing column to fix the fixing column.

[0007] Preferably, a fixing base is fixedly arranged at the lower part of the fixing column, a first sliding base and a second sliding base are slidingly arranged on the fixing column, the first sliding base and the second sliding base are located above the fixing base, a fixing sleeve is fixedly arranged on the side of the fixing base, the first sliding base and the second sliding base facing the heat pipes, the three heat pipes are connected with the fixing base, the first sliding base and the second sliding base through the fixing sleeve, and the heat pipes are rotationally connected with the fixing sleeve; the lifting mechanism is arranged between the fixing base, the first sliding base and the second sliding base.

[0008] Preferably, the lifting mechanism comprises two oppositely arranged lifting assemblies, the lifting assembly comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod arranged in sequence from bottom to top, one end of the first connecting rod is hingedly connected with a fixing plate, the fixing plate being fixedly arranged on the fixing base; the other end of the first connecting rod is hingedly connected with one end of the second connecting rod, the other end of the second connecting rod is hingedly connected with a first sliding plate, the first sliding plate being fixedly arranged on the first sliding base; the first sliding plate is hingedly connected with the third connecting rod, the other end of the second connecting rod is provided with a second gear, and the end of the third connecting rod hingedly connected with the first sliding plate is provided with a third gear meshing with the second gear; the end of the third connecting rod away from the first sliding plate is hingedly connected with one end of the fourth connecting rod, the other end of the fourth connecting rod is hingedly connected with a second sliding plate, and the second sliding plate is fixedly arranged on the second sliding base.

[0009] Preferably, a first motor is arranged on the fixing plate to drive the first connecting rod to rotate, the end of the first connecting rod hingedly connected with the fixing plate is provided with a first gear, and the first gears of the first connecting rods of the two lifting assemblies are meshed; the lifting assemblies are located on the side of the fixing column away from the evaporator.

[0010] Preferably, the swing mechanism comprises a limiting rod arranged in parallel with the fixed rod, the bottom end of the limiting rod is hinged to the lower part of the fixed column through a first swing rod, the top end of the limiting rod is hinged to the upper part of the fixed column through a second swing rod, the fixed rod, the limiting rod, the first swing rod and the second swing rod form a parallelogram structure; the base is provided with a power structure for driving the limiting rod to lift and lower, the hot air pipe is connected with the limiting rod through a connecting assembly, and the limiting rod drives the hot air pipe to reciprocating swing through the connecting assembly.

[0011] Preferably, the power structure comprises a second motor fixedly arranged on the base, a rotating rod is fixedly arranged on the output shaft of the second motor, a transmission rod is hinged to the end of the rotating rod away from the output shaft of the second motor, the end of the transmission rod away from the rotating rod is hinged to the middle part of the first swing rod, the second motor drives the first swing rod to reciprocating swing through the rotating rod and the transmission rod, and the first swing rod drives the limiting plate to translate in lifting and lowering.

[0012] Preferably, the connecting assembly comprises a fixed rod fixedly arranged at one end of the hot air pipe, one end of the fixed rod is provided with a fixed pin, a sliding groove is arranged on the limiting rod along the length direction of the limiting rod, the fixed pin is located in the sliding groove and rotates and slides along the sliding groove, and the end of the fixed pin is provided with a limiting block for preventing the fixed pin from sliding out of the sliding groove; the limiting rod drives the fixed rod to reciprocating swing through the sliding groove and the fixed pin, and the fixed rod drives the nozzle to reciprocating swing through the hot air pipe.

[0013] A commercial heat pump dishwasher comprises the defrosting device, the evaporator is provided with a shell for protection, the shell is provided with a fan for introducing ambient air into the evaporator, and the defrosting device is arranged between the shell and the evaporator; the medium outlet of the evaporator is connected with the medium inlet of the condenser arranged in the water tank through a first medium pipe, the first medium pipe is provided with an expansion valve, the medium outlet of the condenser is connected with the medium inlet of the evaporator through a second medium pipe, the second medium pipe is provided with a compressor, an electromagnetic valve and a fan are arranged on the communication pipe communicated with the hot air pipe, the fan sends hot air in the compressor into the hot air pipe, the upper part of the water tank is provided with a hot water outlet, the hot water outlet is communicated with the dishwasher through a drain pipe, and the lower part of the water tank is provided with a water inlet pipe for allowing cold water to enter the water tank.

[0014] The defrosting method of the commercial heat pump dishwasher comprises the following steps:

[0015] S1, start the compressor, the compressor compresses the gaseous medium, generates high-temperature and high-pressure gaseous medium, the gaseous medium flows into the condenser through the second medium pipe, the medium exchanges heat with the water in the water tank in the condenser, the water in the water tank is heated, the condensed medium flows through the expansion valve into the evaporator through the second medium pipe, the expansion valve reduces the pressure of the condensed medium, and the flow is cut off to form a gas-liquid mixed medium, the gas-liquid mixed medium exchanges heat with the air in the evaporator to form low-pressure gaseous medium, and the low-pressure gaseous medium is compressed by the compressor; the hot water in the water tank is sent to the dishwasher through the drain pipe for use;

[0016] S2, when the temperature sensor in the evaporator detects that the evaporator fin temperature reaches the threshold value, the electromagnetic valve and the fan on the air pipe are opened, the fan sends the hot air in the compressor into the hot air pipe through the air pipe, and then sprays the evaporator fin through the nozzle, and defrosts the evaporator;

[0017] S3, start the first motor, the first motor drives the first connecting rod to rotate, the first connecting rod drives the other first connecting rod to rotate in the opposite direction through the first gear, the first connecting rod drives the first sliding block to slide on the fixed column through the second connecting rod, the second connecting rod rotates, the second connecting rod drives the third connecting rod to rotate through the second gear and the third gear, the third connecting rod drives the second sliding block to slide on the fixed column through the fourth connecting rod, and the fourth connecting rod rotates; the first sliding block and the second sliding block drive the hot air pipe to move synchronously through the fixed sleeve, the hot air pipe rises, and the distance between the hot air pipes is opened;

[0018] S4, start the second motor, the second motor drives the first swing rod to reciprocatingly swing through the rotating rod and the transmission rod, the first swing rod drives the second swing rod to reciprocatingly swing synchronously through the limiting rod, the limiting rod moves up and down while translating, the limiting rod drives the fixed rod to reciprocatingly swing through the sliding groove and the fixed pin, the fixed rod drives the nozzle to swing through the hot air pipe, the nozzle swings and sprays hot air to the fins of the evaporator, and the evaporator is defrosted;

[0019] S5, the water after the frost is melted is discharged through the drain hole at the bottom of the shell.

[0020] The defrosting device of the heat pump dishwasher, the commercial heat pump dishwasher and the defrosting method have the following advantages and positive effects:

[0021] 1. The hot air in the compressor enters the defrosting device through the air pipe, the hot air generated during the operation of the compressor is used for defrosting the evaporator, the power of the compressor does not need to be reduced, the compressor operates normally, the heating efficiency of the hot water is improved, and the waste heat air generated by the compressor is used for defrosting, so that the energy consumption is reduced.

[0022] 2、The defrosting device of the present application is arranged between the shell and the evaporator, when the evaporator is working normally, the hot air pipe is folded in the lower part of the fixed column through the lifting mechanism, so as to avoid affecting the normal work of the evaporator. When defrosting, the lifting mechanism stretches the hot air pipe on the fixed column, covers the fins of the evaporator, and improves the defrosting effect.

[0023] 3、The swing mechanism of the defrosting device of the present application drives the spray head to swing, and the evaporator is defrosted by swinging, so that the defrosting effect is improved.

[0024] The technical solutions of the present application will be further described in detail below through the drawings and examples. DRAWINGS

[0025] Figure 1 It is a front perspective structural schematic diagram of the defrosting device of the present application example 1.

[0026] Figure 2 It is a back perspective structural schematic diagram of the defrosting device of the present application example 1.

[0027] Figure 3 It is a front view structural schematic diagram of the defrosting device of the present application example 1.

[0028] Figure 4 It is a side view structural schematic diagram of the defrosting device of the present application example 1.

[0029] Figure 5 It is a lifting mechanism structural schematic diagram of the defrosting device of the present application example 1.

[0030] Figure 6 It is a swing mechanism structural schematic diagram of the defrosting device of the present application example 1.

[0031] Figure 7 It is a power structure schematic diagram of the defrosting device of the present application example 1.

[0032] Figure 8 It is an evaporator structural schematic diagram of the present application example 2.

[0033] Figure 9 It is a three-dimensional structural schematic diagram of the commercial heat pump dishwasher of the present application example 2.

[0034] REFERENCE NUMERALS

[0035] 1, fixed column; 2, base; 3, fixed seat; 4, first sliding seat; 5, second sliding seat; 6, fixed plate; 7, first sliding plate; 8, second sliding plate; 9, hot gas pipe; 10, spray head; 11, first motor; 12, first connecting rod; 13, second connecting rod; 14, third connecting rod; 15, fourth connecting rod; 16, first gear; 17, second gear; 18, third gear; 19, fixed sleeve; 20, limiting rod; 21, first swing rod; 22, second swing rod; 23, sliding groove; 24, fixed rod; 25, limiting block; 26, second motor; 27, rotating rod; 28, transmission rod; 29, evaporator; 30, shell; 31, fan; 32, water tank; 33, first medium pipe; 34, expansion valve; 35, second medium pipe; 36, compressor; 37, air pipe; 38, water inlet pipe; 39, drain pipe; 40, dishwasher. DETAILED DESCRIPTION

[0036] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs. If there is any inconsistency, the meaning described in the specification or derived from the content described in the specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0038] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0039] Example 1

[0040] As Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a heat pump dishwasher defrosting device, comprising a fixed column 1, a plurality of parallel hot air pipes 9 are arranged between the fixed column 1. In this embodiment, three hot air pipes 9 are arranged, and two fixed columns 1 are arranged. The fixed column 1 is arranged on both sides of one end of the evaporator 29, and the hot air pipe 9 is arranged in front of the fin of the evaporator 29. The bottom of the fixed column 1 is fixedly provided with a base 2 for fixing the fixed column 1. The hot air pipe 9 is connected with the shell 30 of the compressor 36 through the air pipe 37, and the hot air generated by the operation of the compressor 36 enters the hot air pipe 9 through the air pipe 37. The hot air pipe 9 is uniformly provided with a plurality of nozzles facing the fins of the evaporator 29, and the hot air pipe 9 blows to the fins of the evaporator 29 through the nozzles to defrost the evaporator 29.

[0041] The lower part of the fixed column 1 is fixedly provided with a fixed seat 3, and the first sliding seat 4 and the second sliding seat 5 are slidably arranged on the fixed column 1, and the first sliding seat 4 and the second sliding seat 5 are located above the fixed seat 3. The side of the fixed seat 3, the first sliding seat 4 and the second sliding seat 5 towards the hot air pipe 9 is fixedly provided with a fixed sleeve 19, and the three hot air pipes 9 are connected with the fixed seat 3, the first sliding seat 4 and the second sliding seat 5 through the fixed sleeve 19. The hot air pipe 9 is rotatably connected with the fixed sleeve 19. Under the limiting action of the rigid hot air pipe 9, the first sliding seat 4 and the second sliding seat 5 can only slide up and down along the fixed column 1, and cannot rotate.

[0042] As Figure 5As shown, the fixed column 1 is provided with a lifting mechanism driving the hot air pipe 9 to lift along the fixed column 1, and the height of the hot air pipe 9 and the distance between the hot air pipes 9 are adjusted by the lifting mechanism, so that the hot air pipes 9 are evenly distributed on the fin side of the evaporator 29. The lifting mechanism includes two oppositely arranged lifting assemblies, and each fixed column 1 is provided with two linked lifting assemblies. The lifting assemblies on the two fixed columns 1 act synchronously at both ends of the hot air pipe 9, improving the stability of the movement of the hot air pipe 9. The lifting assembly includes a first connecting rod 12, a second connecting rod 13, a third connecting rod 14 and a fourth connecting rod 15 arranged in sequence from bottom to top. One end of the first connecting rod 12 is hinged to the fixed plate 6, and the fixed plate 6 is fixedly arranged on the fixed seat 3. The other end of the first connecting rod 12 is hinged to one end of the second connecting rod 13, and the other end of the second connecting rod 13 is hinged to the first sliding plate 7, and the first sliding plate 7 is fixedly arranged on the first sliding seat 4. The first sliding plate 7 is hinged with the third connecting rod 14. The other end of the second connecting rod 13 is fixedly provided with a second gear 17, and the end of the third connecting rod 14 hinged to the first sliding plate 7 is fixedly provided with a third gear 18 engaged with the second gear 17. The end of the third connecting rod 14 away from the first sliding plate 7 is hinged to one end of the fourth connecting rod 15. The other end of the fourth connecting rod 15 is hinged to the second sliding plate 8, and the second sliding plate 8 is fixedly arranged on the second sliding seat 5. The second connecting rod 13 and the third connecting rod 14 are engaged through the second gear 17 and the third gear 18, improving the stability of the linkage between the second connecting rod 13 and the third connecting rod 14, thereby improving the stability of the sliding of the first sliding block and the second sliding block.

[0043] The fixed plate 6 is fixedly provided with a first motor 11 driving the first connecting rod 12 to rotate. The end of the first connecting rod 12 hinged to the fixed plate 6 is fixedly provided with a first gear 16, and the first gears 16 of the two lifting assemblies are engaged, realizing the synchronous action of the two lifting assemblies. The lifting assembly is located on the side of the fixed column 1 away from the evaporator 29, avoiding affecting the work of the hot air pipe 9.

[0044] As shown in the figure, Figure 6 The fixed column 1 is provided with a swing mechanism driving the hot air pipe 9 to swing, and the swing mechanism drives the nozzle to swing through the hot air pipe 9 to defrost the evaporator 29, improving the defrosting effect of the evaporator 29. The swing mechanism includes a limiting rod 20, and the limiting rod 20 is arranged in parallel with the fixed rod 24. The bottom end of the limiting rod 20 is hinged to the lower part of the fixed column 1 through a first swing rod 21, and the top end of the limiting rod 20 is hinged to the upper part of the fixed column 1 through a second swing rod 22. The fixed rod 24, the limiting rod 20, the first swing rod 21 and the second swing rod 22 form a parallelogram structure.

[0045] As shown in the figure, Figure 7As shown, the base 2 is provided with a power structure for driving the limiting rod 20 to lift. The power structure comprises a second motor 26 fixed on the base 2, and a rotating rod 27 fixed on the output shaft of the second motor 26. The end of the rotating rod 27 away from the output shaft of the second motor 26 is hinged with a transmission rod 28, and the end of the transmission rod 28 away from the rotating rod 27 is hinged with the middle part of the first swing rod 21. The second motor 26 drives the first swing rod 21 to swing back and forth through the rotating rod 27 and the transmission rod 28, and the first swing rod 21 drives the limiting plate to translate in lifting.

[0046] The hot air pipe 9 is connected with the limiting rod 20 through a connecting assembly, and the limiting rod 20 drives the hot air pipe 9 to swing back and forth through the connecting assembly. The connecting assembly comprises a fixed rod 24 fixed on one end of the hot air pipe 9. One end of the fixed rod 24 is fixed with a fixed pin. The limiting rod 20 is provided with a sliding groove 23 along the length direction of the limiting rod 20, and the fixed pin is located in the sliding groove 23 and rotates and slides along the sliding groove 23. The diameter of the fixed pin is slightly smaller than the width of the sliding groove 23, so as to ensure that the fixed pin rotates and slides in the sliding groove 23 while improving the stability of the sliding groove 23 driving the fixed pin to move. The end of the fixed pin is fixed with a limiting block 25 for preventing the fixed pin from sliding out of the sliding groove 23. The limiting rod 20 drives the fixed rod 24 to swing back and forth under the action of inertia through the sliding groove 23 and the fixed pin, and the fixed rod 24 drives the nozzle 10 to swing back and forth through the hot air pipe 9.

[0047] Embodiment 2

[0048] As shown in Figure 8 , Figure 9 A commercial heat pump dishwasher comprises the defrosting device of embodiment 1. The evaporator 29 is provided with a shell 30 for protection, and the shell 30 is provided with a fan 31 for introducing ambient air into the evaporator 29. The defrosting device is arranged between the shell 30 and the evaporator 29. When the evaporator 29 is working normally, the hot air pipe 9 is folded at the lower part of the fixed column 1, so as not to affect the normal work of the evaporator 29. When defrosting, the lifting mechanism extends the hot air pipe 9 on the fixed column 1, covers the fins of the evaporator 29, and improves the defrosting effect.

[0049] The medium outlet of the evaporator 29 is connected with the medium inlet of the condenser arranged inside the water tank 32 through the first medium pipe 33. The first medium pipe 33 is provided with an expansion valve 34. The medium outlet of the condenser is connected with the medium inlet of the evaporator 29 through the second medium pipe 35. The second medium pipe 35 is provided with a compressor 36. The communication pipe, which is in communication with the hot air pipe 9, of the compressor 36 is provided with an electromagnetic valve and a fan. The evaporator 29 is provided with a temperature sensor for detecting the fin temperature of the evaporator 29. The electromagnetic valve, the fan, the temperature sensor, the first motor 11 and the second motor 26 are electrically connected with the controller according to the existing technology. The fan sends the hot air in the compressor 36 into the hot air pipe 9. The upper portion of the water tank 32 is provided with a hot water outlet, which is in communication with the dish washing machine 40 through a drain pipe 39. The lower portion of the water tank 32 is provided with a water inlet pipe 38 for allowing cold water to enter the water tank 32. The dish washing machine 40 can be provided with a water storage tank. An electric heater can be arranged in the water storage tank according to the requirement. The water in the water tank 32 is further heated by the electric heater, so as to increase the temperature of the cleaning water.

[0050] The defrosting method of the commercial heat pump dish washing machine 40 comprises the following steps.

[0051] S1, the compressor 36 is started. The compressor 36 compresses the gaseous medium to generate high-temperature and high-pressure gaseous medium. The gaseous medium flows into the condenser through the second medium pipe 35. The medium exchanges heat with the water in the water tank 32 in the condenser, so as to heat the water in the water tank 32. The condensed medium flows through the expansion valve 34 into the evaporator 29 through the second medium pipe 35. The expansion valve 34 reduces the pressure and flow of the condensed medium to form gaseous-liquid mixed medium. The gaseous-liquid mixed medium exchanges heat with the air in the evaporator 29 to form low-pressure gaseous medium. The low-pressure gaseous medium is compressed by the compressor 36. The hot water in the water tank 32 is sent into the dish washing machine 40 through the drain pipe 39 for use.

[0052] S2, when the temperature sensor in the evaporator 29 detects that the fin temperature of the evaporator 29 reaches a threshold value, the electromagnetic valve and the fan on the air pipe 37 are opened. The fan sends the hot air in the compressor 36 into the hot air pipe 9 through the air pipe 37, and then sprays the hot air to the fins of the evaporator 29 through the spray head 10, so as to defrost the evaporator 29.

[0053] S3, start the first motor 11, the first motor 11 drives the first connecting rod 12 to rotate, the first connecting rod 12 drives the other first connecting rod 12 to rotate reversely synchronously through the first gear 16; the first connecting rod 12 drives the first sliding seat 4 to slide on the fixed column 1 through the second connecting rod 13, the second connecting rod 13 rotates; the second connecting rod 13 drives the third connecting rod 14 to rotate through the second gear 17 and the third gear 18, the third connecting rod 14 drives the second sliding seat 5 to slide on the fixed column 1 through the fourth connecting rod 15, the fourth connecting rod 15 rotates; the first sliding seat 4 and the second sliding seat 5 drive the hot air pipe 9 to move synchronously through the fixed sleeve 19, the hot air pipe 9 rises, the distance between the hot air pipe 9 opens, and covers the fins of the evaporator 29.

[0054] S4, start the second motor 26, the second motor 26 drives the first swing rod 21 to swing reciprocatingly through the rotating rod 27 and the transmission rod 28, the first swing rod 21 drives the second swing rod 22 to swing reciprocatingly synchronously through the limiting rod 20, the limiting rod 20 moves up and down while translating; the limiting rod 20 drives the fixed rod 24 to swing reciprocatingly through the sliding groove 23 and the fixed pin, the fixed rod 24 drives the nozzle 10 to swing through the hot air pipe 9; the nozzle 10 swings and sprays hot air to the fins of the evaporator 29, and defrosts the evaporator 29.

[0055] S5, the water after the frost is melted is discharged through the drain hole at the bottom of the shell 30.

[0056] Therefore, the defrosting device of the heat pump dishwasher, the commercial heat pump dishwasher and the defrosting method can solve the problem that the existing heat pump dishwasher needs to reduce the power of the compressor to defrost, and the water heating efficiency is affected.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application but not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A heat pump dishwasher defrosting device, characterized in that: The system includes fixed columns, with several parallel hot air pipes arranged between them. The hot air pipes are connected to the compressor housing via vent pipes. Hot air generated by the compressor enters the hot air pipes through the vent pipes. Several nozzles are evenly arranged on the hot air pipes, pointing towards the evaporator fins. The hot air blows onto the evaporator fins through the nozzles to defrost the evaporator. The fixed columns are equipped with a lifting mechanism that moves the hot air pipes up and down along the columns, adjusting the height of the hot air pipes and the distance between them. The fixed columns are also equipped with a swinging mechanism that moves the hot air pipes, causing the nozzles to swing and defrost the evaporator.

2. A defrosting device for a heat pump dishwasher according to claim 1, characterized in that There are two fixing columns, and the hot air pipe is located between the two fixing columns. The fixing columns are located on both sides of one end of the evaporator, and the hot air pipe is located in front of the fins of the evaporator. The bottom of the fixing column is fixedly provided with a base to fix the fixing column.

3. A defrosting device for a heat pump dishwasher according to claim 2, characterized in that A fixed base is fixedly installed at the lower part of the fixed column, and a first slide block and a second slide block are slidably installed on the fixed column. The first slide block and the second slide block are located above the fixed base. A fixed sleeve is fixedly installed on the side of the fixed base, the first slide block and the second slide block facing the hot air pipe. The three hot air pipes are connected to the fixed base, the first slide block and the second slide block respectively through the fixed sleeve. The hot air pipes are rotatably connected to the fixed sleeve. A lifting mechanism is installed between the fixed base, the first slide block and the second slide block.

4. A defrosting device for a heat pump dishwasher according to claim 3, characterized in that The lifting mechanism includes two opposing lifting components. Each lifting component includes a first link, a second link, a third link, and a fourth link arranged sequentially from bottom to top. One end of the first link is hinged to a fixed plate, which is fixedly mounted on a fixed base. The other end of the first link is hinged to one end of the second link, and the other end of the second link is hinged to a first sliding plate, which is fixedly mounted on a first slide block. A third link is hinged to the first sliding plate. A second gear is provided at the other end of the second link, and a third gear that meshes with the second gear is provided at the end of the third link that is hinged to the first sliding plate. The end of the third link away from the first sliding plate is hinged to one end of the fourth link, and the other end of the fourth link is hinged to the second sliding plate, which is fixedly mounted on a second slide block.

5. A defrosting device for a heat pump dishwasher according to claim 4, characterized in that The fixed plate is equipped with a first motor that drives the first connecting rod to rotate. The end of the first connecting rod that is hinged to the fixed plate is equipped with a first gear. The first connecting rods of the two lifting components are meshed with the first gear. The lifting components are located on the side of the fixed column away from the evaporator.

6. A defrosting device for a heat pump dishwasher according to claim 5, characterized in that The swing mechanism includes a limiting rod, which is arranged parallel to the fixed rod. The bottom end of the limiting rod is hinged to the lower part of the fixed column through a first swing rod, and the top end of the limiting rod is hinged to the upper part of the fixed column through a second swing rod. The fixed rod, the limiting rod, the first swing rod, and the second swing rod form a parallelogram structure. A power structure for driving the limiting rod to rise and fall is provided on the base. The hot air pipe is connected to the limiting rod through a connecting component, and the limiting rod drives the hot air pipe to swing back and forth through the connecting component.

7. A defrosting device for a heat pump dishwasher according to claim 6, characterized in that The power structure comprises a second motor fixedly arranged on the base, a rotating rod fixedly arranged on an output shaft of the second motor, a transmission rod hingedly connected to one end of the rotating rod away from the output shaft of the second motor, and a middle portion of the first swing rod hingedly connected to one end of the transmission rod away from the rotating rod, so that the second motor drives the first swing rod to swing back and forth through the rotating rod and the transmission rod, and the first swing rod drives the limiting plate to translate in the lifting.

8. A defrosting device for a heat pump dishwasher according to claim 7, characterized in that The connecting assembly comprises a fixed rod fixedly arranged at one end of the hot air pipe, a fixed pin arranged at one end of the fixed rod, a sliding groove arranged on the limiting rod along the length direction of the limiting rod, the fixed pin located in the sliding groove and sliding along the sliding groove, and a limiting block arranged at the end of the fixed pin to prevent the fixed pin from sliding out of the sliding groove; the limiting rod drives the fixed rod to swing back and forth through the sliding groove and the fixed pin, and the fixed rod drives the nozzle to swing back and forth through the hot air pipe.

9. A commercial heat pump dishwasher, characterized in that The defrosting device comprises the evaporator, a housing arranged outside the evaporator to protect the evaporator, a fan arranged on the housing to introduce ambient air into the evaporator, and a defrosting device arranged between the housing and the evaporator; a medium outlet of the evaporator is connected with a medium inlet of a condenser arranged inside a water tank through a first medium pipe, an expansion valve is arranged on the first medium pipe, a medium outlet of the condenser is connected with a medium inlet of the evaporator through a second medium pipe, a compressor is arranged on the second medium pipe, an electromagnetic valve and a fan are arranged on a communication pipe communicated with the hot air pipe, the fan sends hot air in the compressor into the hot air pipe, a hot water outlet is arranged on the upper portion of the water tank, the hot water outlet is communicated with the dishwasher through a drain pipe, and a water inlet pipe is arranged on the lower portion of the water tank to make cold water enter the water tank.

10. A defrosting method of a commercial heat pump dishwasher according to claim 9, characterized in that, The method comprises the following steps: S1, starting the compressor, the compressor compresses the gaseous medium to generate high-temperature and high-pressure gaseous medium, the gaseous medium flows into the condenser through the second medium pipe, the medium exchanges heat with the water in the water tank in the condenser to heat the water in the water tank, the condensed medium flows through the expansion valve into the evaporator through the second medium pipe, the expansion valve reduces the pressure and flow of the condensed medium to form gas-liquid mixed medium, the gas-liquid mixed medium exchanges heat with air in the evaporator to form low-pressure gaseous medium, and the low-pressure gaseous medium is compressed by the compressor; the hot water in the water tank is sent into the dishwasher through the drain pipe for use; S2, when the temperature sensor in the evaporator detects that the temperature of the evaporator fins reaches a threshold value, the electromagnetic valve and the fan on the air pipe are opened, the fan sends the hot air in the compressor into the hot air pipe through the air pipe, and then sprays the hot air to the evaporator fins through the nozzle to defrost the evaporator; S3, starting the first motor, the first motor drives the first connecting rod to rotate, the first connecting rod drives another first connecting rod to synchronously and reversely rotate through the first gear, the first connecting rod drives the first sliding seat to slide on the fixed column through the second connecting rod, the second connecting rod rotates, the second connecting rod drives the third connecting rod to rotate through the second gear and the third gear, the third connecting rod drives the second sliding seat to slide on the fixed column through the fourth connecting rod, and the fourth connecting rod rotates; the first sliding seat and the second sliding seat drive the hot air pipe to synchronously move through the fixed sleeve, the hot air pipe rises, and the distance between the hot air pipes is opened. S4, start the second motor, the second motor through the rotating rod and transmission rod drive first swing rod reciprocating swing, the first swing rod through the limit rod drive second swing rod reciprocating synchronous swing, the limit rod moves up and down while translation, the limit rod through the sliding slot and fixed pin drive fixed rod reciprocating swing, fixed rod through the hot gas pipe drive nozzle swing, nozzle swings into the hot air to the fin of evaporator, defrosting evaporator; S5, the water after the frost melting is discharged through the drain hole at the bottom of the shell.

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