Heat pump clothes dryer with electric auxiliary heating

Abstract

A heat pump clothes dryer with electric auxiliary heating comprises a drum assembly arranged in a machine body, and also comprises a front air duct device, a down air duct device and a rear air duct device respectively arranged at the front side, the lower side and the rear side of the drum assembly, and a control device. The drum assembly, the front air duct device, the down air duct device and the rear air duct device are connected in sequence, and the rear air duct device is connected to the drum assembly to form a closed circulation air duct system. The down air duct device comprises a heat pump circulation assembly, and the rear air duct device comprises an electric auxiliary heating assembly. The control device is electrically connected to the heat pump circulation assembly and the electric auxiliary heating assembly respectively. The utility model adds an electric auxiliary heating assembly to the rear air duct. When the temperature is low in the initial stage of drying clothes, when the temperature sensor detects that the temperature of the drying circulation air is lower than the preset value T1, the electric auxiliary heating assembly is started, and the heat pump circulation assembly works at the same time. The two heating systems provide heat for the drying process at the same time, which can greatly improve the heating speed of the heat pump clothes dryer when drying clothes.

Description

Technical Field

[0001] The utility model relates to the technical field of clothes dryers, in particular to a heat pump clothes dryer with electric auxiliary heating. Background Art

[0002] As people's living standards continue to improve, dryers have gradually entered the homes of ordinary citizens; the air circulation and refrigeration cycle of the heat pump dryer are two closed cycles. Ideally, there is no heat dissipation to the outside. The temperature of the clothes is achieved by converting the input electrical energy of the system into heat. Therefore, it has the advantage of energy saving among various types of dryers. It also has its shortcomings: when the ambient temperature is low, the dehumidification process of clothes is long, and the temperature in the drum cannot effectively fluff up the clothes and the dryness decreases, which leads to the heat pump dryer heating up slowly. The drying time of the same mass of wet clothes is longer, giving users the feeling of slow drying and low efficiency.

[0003] In the initial stage of operation of the heat pump system, the system temperature rises slowly. In a general heat pump dryer system, it normally takes 30 minutes for the temperature to rise to the drying temperature of 65°C. Using a heat pump to exchange ambient heat, in a low-temperature environment, relying solely on the heat absorbed by the evaporator end, the temperature at the condenser end rises slowly and it takes a long time to reach equilibrium.

[0004] Therefore, it is necessary to solve the problem of slow heating of clothes when drying clothes with heat pump dryers. Utility Model Content

[0005] The purpose of the utility model is to provide a heat pump dryer with electric auxiliary heating which has a simple and reasonable structure, fast heating, fast drying speed, high drying efficiency and strong practicality, so as to overcome the shortcomings of the prior art.

[0006] A heat pump clothes dryer with electric auxiliary heating designed for this purpose comprises a drum assembly arranged in a machine body, and is characterized in that it also comprises a front air duct device, a down air duct device and a rear air duct device, and a control device, which are respectively arranged on the front side, the lower side and the rear side of the drum assembly, the drum assembly, the front air duct device, the down air duct device and the rear air duct device are connected in sequence, and the rear air duct device is connected to the drum assembly to form a closed circulation air duct system, the down air duct device comprises a heat pump circulation assembly, the rear air duct device comprises an electric auxiliary heating assembly, and the control device is electrically connected to the heat pump circulation assembly and the electric auxiliary heating assembly respectively; the control device controls the electric auxiliary heating assembly to start when the drying circulation air temperature is lower than a preset value T1, controls the electric auxiliary heating assembly to turn off when the drying temperature reaches a preset value T2, and controls the heat pump circulation assembly to turn off when the humidity in the dryer reaches a preset value.

[0007] The front air duct device comprises a door frame assembly arranged at the front side of the machine body, and a filter assembly. The inner cavity of the door frame assembly is provided with a front air duct communicating with the interior of the cylinder assembly, and the filter assembly is arranged on the front air duct.

[0008] A humidity sensor for detecting the humidity in the clothes dryer is arranged on the door frame assembly, and the control device is electrically connected to the humidity sensor.

[0009] The downwind duct device also includes a base assembly, the inner cavity of the base assembly is provided with a downwind duct connected to the front duct, the heat pump circulation assembly is arranged on the downwind duct, and the front side of the base assembly is connected to the door frame assembly.

[0010] The heat pump circulation component comprises an evaporator, a condenser and a fan component. The evaporator is arranged at the air inlet end of the downwind duct, the fan component is arranged at the air outlet end of the downwind duct, and the condenser is located between the evaporator and the fan component.

[0011] The heat pump circulation component also includes a compressor and a throttling device. The compressor is connected to the evaporator and the condenser respectively, and the throttling device is arranged on the pipeline between the evaporator and the condenser.

[0012] An air inlet is arranged on the base assembly, the lower air duct is connected to the front air duct through the air inlet, a temperature sensor for detecting the temperature of the drying circulation air is arranged on the side wall of the air inlet, and the control device is electrically connected to the temperature sensor.

[0013] The rear air duct device also includes a rear air duct shell assembly, the inner cavity of the rear air duct shell assembly is provided with a rear air duct, the rear air duct is respectively connected to the lower air duct and the interior of the barrel assembly, the electric auxiliary heating assembly is arranged on the rear air duct, and the rear side of the base assembly is connected to the rear air duct shell assembly.

[0014] The electric auxiliary heating assembly comprises a heating component and a guard plate. The heating component is fixedly mounted on the guard plate, and the guard plate is fixedly mounted on the rear air duct shell assembly.

[0015] The heating component is provided with a fuse, a thermostat and an NTC sensor. The NTC sensor is electrically connected to the thermostat. The thermostat is disconnected when the NTC sensor detects that the temperature of the heating component exceeds the set control temperature. The fuse is disconnected when the heating component continues to be heated to a certain temperature after the thermostat fails.

[0016] The utility model adds an electric auxiliary heating component to the rear air duct. When the temperature is low in the initial stage of drying clothes, when the temperature sensor detects that the temperature of the drying circulation air is lower than the preset value T1, the electric auxiliary heating component is started, and the heat pump circulation component works at the same time. The two heating systems provide heat for the drying process at the same time, which can greatly improve the heating speed of the heat pump dryer when drying clothes, and then improve the drying speed and drying efficiency of clothes, thereby meeting the needs of customers for fast heating and fast drying of clothes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a clothes dryer in one embodiment of the utility model.

[0018] Figure 2 It is a front view of a clothes dryer in one embodiment of the utility model.

[0019] Figure 3 The figure is a schematic diagram of the internal structure of a clothes dryer in one embodiment of the utility model.

[0020] Figure 4 It is a schematic diagram of the exploded structure of the downwind duct device in one embodiment of the utility model.

[0021] Figure 5 It is a schematic diagram of the exploded structure of the rear air duct device in one embodiment of the utility model.

[0022] Figure 6 It is a front view of a heating component in one embodiment of the utility model. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] See also Figure 1-Figure 6 The heat pump clothes dryer with electric auxiliary heating comprises a drum assembly 2 arranged in a machine body 1, the drum assembly 2 is a drum, and also comprises a front air duct device 3, a lower air duct device 4 and a rear air duct device 5 respectively arranged on the front side, the lower side and the rear side of the drum assembly 2, and a control device (electric control system). The drum assembly 2, the front air duct device 3, the lower air duct device 4 and the rear air duct device 5 are connected in sequence, and the rear air duct device 5 is connected to the drum assembly 2 to form a closed circulation air duct system. The lower air duct device 4 comprises a heat pump circulation component 6, and the rear air duct device 5 comprises an electric auxiliary heating component 7. The control device is electrically connected to the heat pump circulation component 6 and the electric auxiliary heating component 7 respectively; the specific main drying process of the clothes dryer: after the clothes dryer is started, when the temperature of the clothes drying is low in the initial stage, when the temperature sensor 19 detects that the temperature of the clothes drying circulation air is lower than the preset value T1 (45°C), the control device controls the electric auxiliary heating component 7 to start, and at the same time, the control device controls the heat pump circulation component 6 to work, when the temperature sensor 19 detects that the clothes drying temperature reaches the preset value T2 (65°C) Afterwards, the control device controls the electric auxiliary heating component 7 to turn off, and only the heat pump circulation component 6 provides heat for the drying process. When the humidity sensor 10 detects that the humidity value in the dryer reaches the preset humidity value, the control device controls the heat pump circulation component 6 to turn off, completing the drying process.

[0025] The front air duct device 3 includes a door frame assembly 8 and a filter assembly 9 arranged on the front side of the body 1. The inner cavity of the door frame assembly 8 is provided with a front air duct 27 connected to the inside of the drum assembly 2, and the filter assembly 9 is arranged on the front air duct 27; the door frame assembly 8 is installed on the air inlet 18, and the door frame assembly 8 plays the role of supporting the operation of the drum assembly 2 and supporting the front door body. The filter assembly 9 can effectively filter the lint generated during the drying process of clothes, so that the air circulation of the closed circulation air duct system is smoother.

[0026] The door frame assembly 8 is provided with a humidity sensor 10 for detecting the humidity in the clothes dryer. The control device is electrically connected to the humidity sensor 10, and the humidity sensor 10 feeds back the detected humidity value to the control device.

[0027] The down duct device 4 also includes a base assembly 11, the inner cavity of the base assembly 11 is provided with a down duct 12 connected to the front duct 27, the heat pump circulation assembly 6 is arranged on the down duct 12, and the upper front part of the base assembly 11 is connected to the door frame assembly 8; the base assembly 11 includes a base 28 and a circulation air duct cover 29, the circulation air duct cover 29 covers the top opening of the base 28, and the down duct 12 is formed between the base 28 and the circulation air duct cover 29.

[0028] The heat pump circulation component 6 includes an evaporator 13, a condenser 14 and a fan component 15. The evaporator 13 is arranged at the air inlet end of the downwind duct 12, the fan component 15 is arranged at the air outlet end of the downwind duct 12, and the condenser 14 is located between the evaporator 13 and the fan component 15; the circulation air duct cover 29 is installed above the evaporator 13 and the condenser 14, so that the circulating air is in a closed state when passing through the evaporator 13 and the condenser 14.

[0029] The heat pump circulation component 6 further includes a compressor 16 and a throttling device 17 . The compressor 16 is connected to the evaporator 13 and the condenser 14 respectively. The throttling device 17 is arranged on a pipeline between the evaporator 13 and the condenser 14 .

[0030] An air inlet 18 is provided on the front side of the base 28, and the lower air duct 12 is connected to the front air duct 27 through the air inlet 18. A temperature sensor 19 for detecting the temperature of the drying circulation air is provided on the side wall of the air inlet 18. The control device is electrically connected to the temperature sensor 19, and the temperature sensor 19 feeds back the detected temperature value to the control device, and the control device determines the dryer process according to the temperature value.

[0031] The fan component 15 includes a motor 30 and a wind wheel 31. The motor 30 drives and connects to the wind wheel 31. When the motor 30 drives, the wind wheel 31 rotates to circulate air. Figure 1The arrow indicates the air circulation path. The drum assembly 2 rotates continuously to spread the clothes to achieve the drying effect. The fan component 15 operates to circulate air between the drum assembly 2 and the base heat exchanger to form a pressurized dry hot air flow path that enters the drying drum, heats the clothes inside the drum and brings out the hot and humid air with high moisture content to form a hot and humid air flow path, and then cools the moisture through the evaporator 13 to form liquid water for discharge.

[0032] The rear air duct device 5 also includes a rear air duct shell assembly 20, the inner cavity of the rear air duct shell assembly 20 is provided with a rear air duct 21, the rear air duct 21 is respectively connected to the lower air duct 12 and the interior of the barrel assembly 2, the electric auxiliary heating assembly 7 is arranged on the rear air duct 21, the rear side of the base assembly 11 is connected to the rear air duct shell assembly 20, the rear air duct cover 33 is provided with a rear cover air inlet, and the rear air duct 21 is connected to the lower air duct 12 through the rear cover air inlet.

[0033] The electric auxiliary heating assembly 7 includes a heating component 22 and a protective plate 23. The heating component 22 is fixedly mounted on the protective plate 23. The protective plate 23 is fixedly mounted on the rear air duct shell assembly 20. The heating component 22 is a heating wire assembly.

[0034] The rear air duct shell assembly 20 includes a rear cover plate 32 and a rear air duct cover 33. The rear cover plate 32 is connected to the rear side of the base 28, and the rear air duct cover 33 is fixed on the rear cover plate 32. A rear air duct 21 is formed between the rear cover plate 32 and the rear air duct cover 33. When installing the electric auxiliary heating assembly 7, the heating component 22 is first installed on the guard plate 23, and then assembled onto the rear cover plate 32 as a whole. The contact between the rear air duct 21 and the rear part of the barrel assembly 2 is also relatively closed, so that the heat generated by the electric auxiliary heating assembly 7 can directly enter the barrel assembly 2 to circulate and heat up quickly.

[0035] The heating component 22 is provided with a fuse 24, a thermostat 25 and an NTC sensor 26. The NTC sensor 26 is electrically connected to the thermostat 25. When the heating wire detects through the NTC sensor 26 that its own temperature exceeds the set control temperature, the thermostat 25 will disconnect and stop working, thereby stopping the heating wire from working. After the thermostat 25 fails, when the heating wire continues to heat to a certain temperature, the fuse 24 is disconnected, thereby stopping the heating wire from working, thereby playing a role of safety protection.

[0036] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A heat pump clothes dryer with electric auxiliary heating, comprising a drum assembly (2) arranged in a machine body (1), characterized in that: The invention also comprises a front air duct device (3), a lower air duct device (4) and a rear air duct device (5) which are respectively arranged on the front side, the lower side and the rear side of the drum assembly (2), and a control device. The drum assembly (2), the front air duct device (3), the lower air duct device (4) and the rear air duct device (5) are connected in sequence, and the rear air duct device (5) is connected to the drum assembly (2) to form a closed circulation air duct system. The lower air duct device (4) comprises a heat pump circulation assembly (6), and the rear air duct device (5) comprises an electric auxiliary heating assembly (7). The control device is electrically connected to the heat pump circulation assembly (6) and the electric auxiliary heating assembly (7). The control device controls the electric auxiliary heating assembly (7) to start when the temperature of the drying circulation air is lower than a preset value T1, controls the electric auxiliary heating assembly (7) to turn off when the drying temperature reaches a preset value T2, and controls the heat pump circulation assembly (6) to turn off when the humidity in the dryer reaches a preset value.

2. The heat pump clothes dryer with electric auxiliary heating according to claim 1, characterized in that: The front air duct device (3) comprises a door frame assembly (8) arranged at the front side of the machine body (1), and a filter assembly (9); the inner cavity of the door frame assembly (8) is provided with a front air duct (27) connected to the interior of the cylinder assembly (2); and the filter assembly (9) is arranged on the front air duct (27).

3. The heat pump clothes dryer with electric auxiliary heating according to claim 2, characterized in that: A humidity sensor (10) for detecting the humidity in the clothes dryer is arranged on the door frame assembly (8), and the control device is electrically connected to the humidity sensor (10).

4. The heat pump clothes dryer with electric auxiliary heating according to claim 2, characterized in that: The downwind duct device (4) further comprises a base assembly (11); the inner cavity of the base assembly (11) is provided with a downwind duct (12) connected to the front duct (27); the heat pump circulation assembly (6) is arranged on the downwind duct (12); and the front side of the base assembly (11) is connected to the door frame assembly (8).

5. The heat pump clothes dryer with electric auxiliary heating according to claim 4, characterized in that: The heat pump circulation component (6) comprises an evaporator (13), a condenser (14) and a fan component (15); the evaporator (13) is arranged at the air inlet end of the downwind duct (12); the fan component (15) is arranged at the air outlet end of the downwind duct (12); and the condenser (14) is located between the evaporator (13) and the fan component (15).

6. The heat pump clothes dryer with electric auxiliary heating according to claim 5, characterized in that: The heat pump circulation component (6) further comprises a compressor (16) and a throttling device (17); the compressor (16) is connected to the evaporator (13) and the condenser (14) respectively; and the throttling device (17) is arranged on a pipeline between the evaporator (13) and the condenser (14).

7. The heat pump clothes dryer with electric auxiliary heating according to claim 4, characterized in that: An air inlet (18) is provided on the base assembly (11); the lower air duct (12) is connected to the front air duct (27) via the air inlet (18); a temperature sensor (19) for detecting the temperature of clothes drying circulating air is provided on the side wall of the air inlet (18); and the control device is electrically connected to the temperature sensor (19).

8. The heat pump clothes dryer with electric auxiliary heating according to claim 4, characterized in that: The rear air duct device (5) further comprises a rear air duct shell assembly (20); the inner cavity of the rear air duct shell assembly (20) is provided with a rear air duct (21); the rear air duct (21) is connected to the lower air duct (12) and the interior of the barrel assembly (2), respectively; the electric auxiliary heating assembly (7) is arranged on the rear air duct (21); and the rear side of the base assembly (11) is connected to the rear air duct shell assembly (20).

9. The heat pump clothes dryer with electric auxiliary heating according to claim 8, characterized in that: The electric auxiliary heating assembly (7) comprises a heating component (22) and a protective plate (23), wherein the heating component (22) is fixedly mounted on the protective plate (23), and the protective plate (23) is fixedly mounted on the rear air duct shell assembly (20).

10. The heat pump clothes dryer with electric auxiliary heating according to claim 9, characterized in that: The heating component (22) is provided with a fuse (24), a thermostat (25) and an NTC sensor (26); the NTC sensor (26) is electrically connected to the thermostat (25); the thermostat (25) is disconnected when the NTC sensor (26) detects that the temperature of the heating component (22) exceeds a set control temperature; and the fuse (24) is disconnected when the heating component (22) continues to be heated to a certain temperature after the thermostat (25) fails.

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