Drying apparatus and drying method

Abstract

The application provides a drying device and a drying method, which comprise a control unit and a heat pump unit, an auxiliary heating unit, a first heat exchange unit and a drying unit receiving control instructions generated by the control unit, wherein the input end of the auxiliary heating unit is connected with the output end of the heat pump unit, the output end of the auxiliary heating unit is connected with the air inlet of the drying unit, the heat pump unit and the auxiliary heating unit are used for providing dry hot air to the drying unit, the drying unit is used for fully mixing the built-in wet clothes and the dry hot air input from the air inlet, and discharging humid hot air from the air outlet, the first air inlet of the first heat exchange unit is connected with the air outlet of the drying unit, and the air outlet of the first heat exchange unit is connected with the first air inlet of the heat pump unit, so as to provide dry cold air to the heat pump unit, thereby reducing the temperature of the heat pump unit, ensuring that the heat pump unit and the auxiliary heating unit continuously provide heat for the drying unit in the drying process, and improving the drying efficiency of the drying device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying equipment, in particular to a drying device and a drying method. BACKGROUND

[0002] The drying device is a device for reducing the water content of the object to be dried by heat exchange operation, so as to shorten the drying time of the object to be dried.

[0003] The existing drying device takes the internal circulating air as the carrier of moisture and heat exchange, so that it exchanges heat between the built-in heating unit and the humid object placed in the drying device to dry the humid object. In order to improve the drying efficiency of the drying device, an auxiliary heating device is provided in the drying device to provide heat at the same time as the above-mentioned heating unit to shorten the temperature rising stage when the drying device starts, but after the temperature generated by the heating unit reaches the highest control temperature, the auxiliary heating unit stops providing heat to prevent the circulating air from overheating and affecting the normal work of the heating unit, which reduces the use efficiency of the auxiliary heating unit and the drying efficiency of the drying device.

[0004] Therefore, how to improve the use efficiency of the auxiliary heating unit and the drying efficiency of the drying device has become a problem to be solved. SUMMARY

[0005] The present application provides a drying device and a drying method to solve the technical problem of low use efficiency of the auxiliary heating unit and low drying efficiency of the drying device.

[0006] In a first aspect, the present application provides a drying device, comprising: a control unit and a heat pump unit, an auxiliary heating unit, a first heat exchange unit, a drying unit receiving control instructions generated by the control unit;

[0007] The input end of the auxiliary heating unit is connected with the output end of the heat pump unit, and the output end of the auxiliary heating unit is connected with the air inlet of the drying unit, for the heat pump unit and the auxiliary heating unit to provide dry hot air to the drying unit.

[0008] The drying unit is used for fully mixing the built-in humid clothes and the dry hot air input from the air inlet, and discharging humid hot air from the air outlet.

[0009] The first air inlet of the first heat exchange unit is connected with the air outlet of the drying unit, and the air outlet of the first heat exchange unit is connected with the first air inlet of the heat pump unit, so as to provide dry cold air to the heat pump unit.

[0010] In the above technical solution, the air obtained by the heat pump unit is dry cold air with low temperature, and the heat pump unit and the auxiliary heating unit can continuously heat the air to be introduced into the drying unit. Compared with the temperature of the air obtained by the drying unit in the prior art of the drying device, the temperature of the air obtained by the drying unit in the drying device provided by the application is higher, and the drying efficiency is also higher.

[0011] Optionally, the drying device further comprises an air circulation unit, and the air circulation unit comprises a first air circulation fan; the first heat exchange unit is further provided with a second air inlet;

[0012] The second air inlet of the first heat exchange unit is provided with the first air circulation fan, and the first air circulation fan is used to deliver cold air outside the drying device into the first heat exchange unit, so that the first heat exchange unit performs heat exchange operation and condensation operation on the cold air and the humid hot air input through the first air inlet.

[0013] Optionally, the heat pump unit is further provided with a second air inlet and a third air inlet;

[0014] The air outlet of the drying unit is connected with the second air inlet of the heat pump unit, and is used to process the humid hot air delivered by the drying unit.

[0015] Optionally, the air outlet of the first heat exchange unit comprises a first air outlet and a second air outlet, and the first air inlet of the heat pump unit comprises a first sub-air inlet and a second sub-air inlet; the heat pump unit comprises:

[0016] The second heat exchange unit, the main air inlet of which is the second main air inlet of the drying unit, the slave air inlet of which is connected with the slave air outlet of the third heat exchange unit, the main air outlet of which is connected with the main air inlet of the third heat exchange unit, the main air inlet of which is used to flow in humid hot air; the slave air inlet is used to flow in dry cold air; and the second heat exchange unit is used to condense the humid hot air by the dry hot air, so as to output dry cold air through the main air outlet;

[0017] The heating pump, the main air inlet of which is connected with the slave air outlet of the second heat exchange unit, the main air inlet of which is used to flow in dry cold air, the slave air inlet of which is used to flow in dry cold air, and the slave air inlet of which is connected with the first air outlet of the first heat exchange unit, the slave air inlet of which is used to flow in dry cold air, and the heating pump is used to heat the dry cold air and output dry hot air;

[0018] The third heat exchange unit, the main air outlet of which is the air outlet of the heat pump unit, the slave air inlet of which is connected with the main air outlet of the heat pump unit, the slave air inlet of which is used as the second sub-air inlet of the heat pump unit and is further connected with the second air outlet of the first heat exchange unit, the main air inlet of which is used to flow in dry cold air, and the third heat exchange unit is used to heat the dry cold air by the dry hot air and output dry hot air.

[0019] Optionally, the air outlet of the drying unit is provided with an air duct adjusting unit; the air outlet of the heat pump unit is provided with a temperature sensing unit for obtaining temperature data of the air outlet;

[0020] The air duct adjusting unit is configured to, when receiving a first control instruction generated and sent by the control unit according to the temperature data and a first preset temperature range, open the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and close the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0021] The air duct adjusting unit is further configured to, when receiving a second control instruction generated and sent by the control unit according to the temperature data and a second preset temperature range, close the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0022] The air duct adjusting unit is further configured to, when receiving a third control instruction generated and sent by the control unit according to the temperature data and a third preset temperature range, open the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0023] Optionally, when receiving the first control instruction and the second control instruction, the air duct adjusting unit stops the heat exchange operation of the first heat exchange unit;

[0024] When receiving the third control instruction, the air duct adjusting unit starts the heat exchange operation of the first heat exchange unit.

[0025] Optionally, the air circulation unit further comprises a second air circulation fan, which is arranged between the air outlet of the heat pump unit and the input end of the auxiliary heating unit, and is used to drive the circulation of air in the drying device.

[0026] Optionally, the drying unit comprises a drum.

[0027] The door opening structure is arranged on the drum wall, and when the drying device is in a working state, the door opening structure is in an unopenable state; when the drying device is in a non-working state, the door opening structure is in an openable state.

[0028] The drum is provided with a plurality of circular hole ventilation structures on both sides, wherein the front side of the drum is connected with the air outlet of the drying unit, and the rear side of the drum is connected with the air inlet of the drying unit.

[0029] Optionally, when the door opening structure of the drum is in the openable state, the door opening structure is parallel to the clothes placing end of the drying device and is located at the upper end of the drum.

[0030] Optionally, the drying unit further comprises a direct drive motor.

[0031] The mechanical shaft of the direct-drive motor is connected with the drum to drive the drum to rotate according to a preset rule.

[0032] In the above technical solution, the drying device divides the drying process into three stages according to the temperature data of the output end of the heat pump unit. In the first stage, the unit connected in the air duct of the drying device performs heating operation to realize rapid temperature rise of the drying device in the initial starting stage. When the temperature meets the drying standard, the second stage is entered, and the heat pump unit can continuously warm up with the auxiliary heating unit without being affected by the input air temperature. When the temperature rises to the working state of the drying device entering the third stage, the heat pump unit and the auxiliary heating unit can still work at full power due to the first heat exchange unit delivering cooling cold air to the heat pump unit, so that the drying unit always obtains the heat generated by the two heating units in the drying process, thereby improving the drying efficiency of the drying device.

[0033] In a second aspect, the application provides a drying method, the method is applied to a control unit, and the method comprises the following steps:

[0034] obtaining a starting instruction;

[0035] controlling the heat pump unit and the auxiliary heating unit to provide dry hot air to the drying unit according to the starting instruction;

[0036] controlling the drying unit to fully mix the built-in wet clothes with the dry hot air and then discharge humid hot air from the air outlet of the drying unit;

[0037] controlling the first air inlet of the first heat exchange unit connected with the drying unit to receive the humid hot air, and providing dry cold air to the first air inlet of the heat pump unit through the air outlet of the first heat exchange unit after the first heat exchange unit completes heat exchange operation.

[0038] Optionally, the method further comprises the following steps:

[0039] controlling the air outlet of the heat pump unit to deliver humid hot air to the second air inlet of the heat pump unit.

[0040] Optionally, the method further comprises the following steps:

[0041] obtaining temperature data obtained by a temperature sensing unit;

[0042] generating a first control instruction according to the temperature data and a first preset temperature range, and sending the first control instruction to the air duct adjusting unit to control the air duct adjusting unit to open the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit and close the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit;

[0043] generate a second control instruction according to the temperature data and a second preset temperature range, and send the second control instruction to the air duct adjusting unit to control the air duct adjusting unit to close the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and to open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit;

[0044] generate a third control instruction according to the temperature data and a third preset temperature range, and send the third control instruction to the air duct adjusting unit to control the air duct adjusting unit to open the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and to open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0045] The application provides a drying device and a drying method. The drying device comprises a control unit and a heat pump unit, an auxiliary heating unit, a first heat exchange unit and a drying unit receiving control instructions generated by the control unit. The input end of the auxiliary heating unit is connected with the output end of the heat pump unit, the output end of the auxiliary heating unit is connected with the air inlet of the drying unit, and the heat pump unit and the auxiliary heating unit are used to provide dry hot air to the drying unit. The drying unit is used to fully mix the built-in wet clothes with the dry hot air input from the air inlet and discharge humid hot air from the air outlet. The first air inlet of the first heat exchange unit is connected with the air outlet of the drying unit, and the air outlet of the first heat exchange unit is connected with the first air inlet of the heat pump unit to provide dry cold air to the heat pump unit, thereby reducing the temperature of the heat pump unit and ensuring that the heat pump unit and the auxiliary heating unit continuously provide heat to the drying unit during the drying process, thereby improving the drying efficiency of the drying device. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0047] Figure 1 A structural schematic diagram of a drying device provided by an embodiment of the application is shown in the figure.

[0048] Figure 2 A structural schematic diagram of a drying device provided by another embodiment of the application is shown in the figure.

[0049] Figure 3A A schematic diagram of a door opening structure on the upper side of a drum wall provided by another embodiment of the application is shown in the figure.

[0050] Figure 3B A structural schematic diagram of two sides of a drum provided by another embodiment of the application is shown in the figure.

[0051] Figure 4 A structural schematic diagram of a drying device provided by another embodiment of the application is shown in the figure.

[0052] Figure 5 A flowchart of the drying method provided by an embodiment of the present application is shown in the following figure.

[0053] Figure 6 A flowchart of the drying method provided by another embodiment of the present application is shown in the following figure.

[0054] The specific embodiments have been shown and described in the foregoing drawings and specification, it is to be understood that the application is not limited to the embodiments disclosed, but instead can be practiced with the scope of the claims. It is intended to cover any adaptations or variations of the present application. DETAILED DESCRIPTION

[0055] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, unless otherwise indicated, like numbers in the figures indicate like components. The following detailed description includes specific details for the purpose of providing an understanding of the present application. However, it will be apparent to those skilled in the art that the application can be practiced without these specific details. In some instances, well-known structures and components are not described in detail in order to avoid obscuring the application.

[0056] The drying apparatus is a device for reducing the moisture content of an object to be dried by heat exchange operation, thereby shortening the drying time of the object to be dried.

[0057] The conventional drying apparatus uses internal circulating air as a carrier for moisture and heat exchange, and performs heat exchange between a built-in heating unit and a humid object placed in the drying apparatus, thereby drying the humid object. In order to improve the drying efficiency of the drying apparatus, an auxiliary heating device is provided in the drying apparatus to provide heat simultaneously with the heating unit, thereby shortening the temperature rising period when the drying apparatus is started. However, after the temperature generated by the heating unit reaches the maximum control temperature, the auxiliary heating unit stops providing heat to prevent the circulating air from overheating and affecting the normal operation of the heating unit, thereby reducing the use efficiency of the auxiliary heating unit and affecting the drying efficiency of the drying apparatus.

[0058] Therefore, how to improve the drying efficiency of the drying apparatus becomes a problem to be solved.

[0059] In order to solve the problems of low use efficiency of the auxiliary heating unit and low drying efficiency of the drying apparatus, the present application provides a drying apparatus and a drying method. The technical concept of the present application is to reduce the temperature of the circulating air entering the heating unit of the drying apparatus, thereby reducing the influence of the heat generated by the auxiliary heating unit on the working state of the heating unit, achieving continuous heat supply by the auxiliary heating unit during the drying process of the drying apparatus, increasing the heat exchanged with the humid clothes per unit time, improving the use efficiency of the auxiliary heating unit, and thereby improving the drying efficiency of the drying apparatus.

[0060] Figure 1 This is a schematic diagram of the structure of a drying device provided in one embodiment of this application, as shown below. Figure 1 As shown, the system includes a control unit 10 and an execution unit 20. The execution unit 20 includes a drying unit 201, an auxiliary heating unit 202, a heat pump unit 203, and a first heat exchange unit 204. The air outlet of the drying unit 201 is connected to the first air inlet of the first heat exchange unit 204, the air outlet of the first heat exchange unit 204 is connected to the first air inlet of the heat pump unit 203, the output terminal of the heat pump unit 203 is connected to the input terminal of the auxiliary heating unit 202, and the output terminal of the auxiliary heating unit 202 is connected to the air inlet of the drying unit 201.

[0061] Control unit 10 controls execution unit 20 to perform corresponding operations according to the state of the drying equipment and a preset control sequence. When execution unit 20 starts operating, the circulating air in execution unit 20 undergoes heat exchange and moisture content changes in different units to dry damp clothes. During one cycle of air circulation in execution unit 20, heat pump unit 203 heats the currently stored air and then transmits dry hot air through air duct A to air duct B. The dry hot air is reheated by auxiliary heating unit 202 to obtain even hotter dry air, and then transmitted into the air inlet of drying unit 201 through air duct B. After the drying unit 201 fully mixes the damp clothes inside with the dry hot air input through the air inlet, the dry hot air absorbs some moisture from the damp clothes and is discharged from the air outlet of drying unit 201, i.e., the air in air duct C is humid hot air. When the humid hot air enters from the air inlet of the first heat exchange unit 204, it undergoes heat exchange in the first heat exchange unit 204 to cool and condense the air to obtain dry cold air. In this process, the cooling energy provided by the first heat exchange unit 204 during heat exchange is the air obtained by the first heat exchange unit 204 from the external environment. The temperature of this air is lower than the temperature of the humid hot air obtained by the first air inlet of the first heat exchange unit 204. The aforementioned dry cold air is discharged from the air outlet of the first heat exchange unit 204, enters the heat pump unit 203 through the air duct D, and is heated by the heat pump unit 203. After generating dry hot air, it is discharged again from the output end of the heat pump unit 203 and enters the air duct A for the next round of air circulation. The execution unit 20 performs several air circulations until the damp clothes in the drying unit 201 are completely dried.

[0062] In the running process of the execution unit 20, since the air obtained by the heat pump unit 203 is dry cold air with low temperature, the heat pump unit 203 and the auxiliary heating unit 202 can continuously heat the air to be entered into the drying unit. Compared with the temperature of the air obtained by the drying unit in the prior art of the drying device, the temperature of the air obtained by the drying unit in the drying device provided by the present application is higher, so that the drying efficiency is also higher.

[0063] Figure 2 The structural schematic diagram of the drying device provided by another embodiment of the present application is shown in the figure. Figure 2 As shown in the figure, the execution unit of the drying device comprises a drying unit 201, an auxiliary heating unit 202, a heat pump unit 203, and a first heat exchange unit 204. The heat pump unit 203 comprises a heating pump 2031, a second heat exchange unit 2032, and a third heat exchange unit 2033. In addition, the above-mentioned execution unit further comprises an air duct adjusting unit 205, an air circulation unit 206, and a temperature sensing unit 207. The air circulation unit 206 comprises a first air circulation fan 2061 and a second air circulation fan 2062. The second air circulation fan 2062 is arranged between the air outlet of the heat pump unit 203 and the input end of the auxiliary heating unit 202, and is used to drive the circulation of the air in the drying device.

[0064] The air duct adjusting unit 205 is arranged at the air outlet of the drying unit 201, and is used to obtain the humid hot air transmitted by the drying unit 201 to the air duct C. The air outlet of the air duct adjusting unit 205 is connected to two air ducts, including an air duct C1 and an air duct C2. The air duct C2 is used to connect the air duct adjusting unit 205 and the third heat exchange unit 2033 in the heat pump unit 203, and the air duct C1 is used to connect the air duct adjusting unit 205 and the first heat exchange unit 204. The first air circulation fan 2061 is arranged at the second air inlet of the first heat exchange unit 204, and is used to transmit the cold air outside the drying device into the first heat exchange unit 204 through the air duct J, so that the first heat exchange unit 204 performs heat exchange operation and condensation operation on the humid hot air input through the first air inlet connected with the air duct C1.

[0065] The temperature sensing unit 207 is arranged at the air outlet of the heat pump unit 203, and is used to obtain the temperature data of the air outlet. According to the temperature of the air output by the heat pump unit 203 and the preset threshold value, the working state of the drying device is divided into three stages:

[0066] The first stage is an initial heating stage, i.e. a stage in which the air circulating in the drying device is heated when the drying device is turned on. In the first stage, the temperature of the outlet of the heat pump unit 203 detected by the temperature sensing unit 207 is in the first preset temperature range, the control unit generates a first control instruction and sends the instruction to the execution device, the air duct adjusting unit 205 in the execution device turns on the air duct C and C1 between the outlet of the drying unit 201 and the first air inlet of the heat pump unit 203, and turns off the air duct C and C2 between the outlet of the drying unit 201 and the second air inlet of the heat pump unit 203. In the current stage, the first heat exchange unit 204 does not perform heat exchange operation. The outlet of the first heat exchange unit 204 is connected with the first air inlet of the heat pump unit 203, the outlet of the first heat exchange unit 204 includes a first outlet and a second outlet, and the first air inlet of the heat pump unit 203 includes a first sub-air inlet and a second sub-air inlet. Therefore, the first outlet of the first heat exchange unit 204 is connected with the first sub-air inlet of the heat pump unit 203 through the air duct D1, and the second outlet of the first heat exchange unit 204 is connected with the second sub-air inlet of the heat pump unit 203 through the air duct D2. The air entering the first heat exchange unit 204 from the air duct C1 only enters the heat pump unit from the second outlet thereof and flows into the main air inlet of the third heat exchange unit 2032 of the heat pump unit 203. At the same time, the slave air inlet of the third heat exchange unit 2032 is connected with the main outlet of the heating pump 2031 through the air duct F, so as to flow into the hot air from the slave air inlet thereof. The third heat exchange unit 2032 heats the air flowing into the main air inlet from the slave air inlet to increase the temperature of the air, i.e. the temperature of the air flowing out of the main outlet of the third heat exchange unit 2032 is higher than that of the air flowing into the main air inlet thereof. The air flowing out of the heat pump unit 203 is driven by the second air circulation fan 2062 to enter the auxiliary heating unit 202 along the air duct A for secondary heating, and then enters the drying unit 201 from the air inlet thereof to complete a round of air circulation. During the first stage, the temperature data detected by the temperature sensing unit 207 continues to rise until it exceeds the first preset temperature range, so as to enter the second stage.

[0067] The second stage is the initial drying stage. In this stage, the temperature of the outlet of the heat pump unit 203 detected by the temperature sensing unit 207 is in the second preset temperature range, the control unit generates a second control instruction and sends the instruction to the execution device, the air duct adjusting unit 205 in the execution device closes the air duct C and C1 between the outlet of the drying unit 201 and the first inlet of the heat pump unit 203, and turns on the air duct C and C2 between the outlet of the drying unit 201 and the second inlet of the heat pump unit 203. The air in the air duct C2 is humid hot air, which enters the second heat exchange unit 2033 as the second inlet of the heat pump unit 203 from the main inlet of the second heat exchange unit 2033. At the same time, the dry cold air flows into the second heat exchange unit 2033 from the inlet, exchanges heat with the above-mentioned humid hot air in the second heat exchange unit 2033, and condenses to obtain dry cold air. The dry cold air flows out from the main outlet and the outlet of the second heat exchange unit 2033 respectively. Among them, the main outlet is connected with the main inlet of the third heat exchange unit 2032 through the air duct H, and the outlet is connected with the main inlet of the heating pump 2031 through the air duct G. The heating pump 2031 heats the dry cold air and then sends it to the second inlet of the third heat exchange unit 2032 through the air duct F. The third heat exchange unit 2032 exchanges heat between the dry hot air flowing into the second inlet and the dry cold air flowing into the main inlet to output dry hot air from the main outlet and dry cold air from the outlet. The dry hot air enters the air duct A, and the dry cold air enters the air duct E. The transmission and heat exchange process of the air in the drying device in the air duct A in the second stage are the same as those in the first stage, which will not be described here. During the second stage, the temperature data detected by the temperature sensing unit 207 continues to rise until it exceeds the second preset temperature range, and enters the third stage.

[0068] The third stage is a full-power drying stage. In this stage, the temperature of the outlet of the heat pump unit 203 obtained by the temperature sensing unit 207 is in the third preset temperature range, the control unit generates a third control instruction and sends the instruction to the execution device, the air duct adjusting unit 205 in the execution device turns on the air duct C and C1 between the outlet of the drying unit 201 and the first inlet of the heat pump unit 203, and also turns on the air duct C and C2 between the outlet of the drying unit 201 and the second inlet of the heat pump unit 203. The first air circulation fan 2061 and the first heat exchange unit 204 in the execution device start to work, and a part of the moist hot air flowing out of the outlet of the drying unit 201 enters the heat pump unit 203 through the air duct C and C2, and the air transmission and heat exchange process thereof is the same as that in the second stage, which will not be described herein again. Another part of the moist hot air flowing out of the outlet of the drying unit 201 enters the first heat exchange unit 204 through the air duct C and C1 from the first inlet of the first heat exchange unit 204, and exchanges heat and condenses with the cold air flowing into the second inlet of the first heat exchange unit 204 from the air duct J under the drive of the first air circulation fan 2061 in the first heat exchange unit 204 to obtain dry cold air, wherein the dry cold air is entirely from the moist hot air transported into the first heat exchange unit 204 through the air duct C1. The above dry cold air is transported into the third heat exchange unit 2032 through the air duct D2 to be heated again. In addition, the dry cold air entering the first heat exchange unit 204 from the air duct J is heated after heat exchange, and is discharged from the drying device, and can flow to the heat pump 2031 through the air duct D1 to take away the heat of the heat pump 2031 when being discharged, wherein the temperature of the hot air discharged from the air duct D1 is lower than the temperature of the heat pump 2031. Since the first air circulation unit 204 continuously reduces the temperature of the air entering the heat pump unit 203, the heat pump 2031 and the auxiliary heating unit 202 in the drying device can continuously work at full power to improve the use efficiency of the auxiliary heating unit and the drying efficiency of the drying device.

[0069] The drying unit comprises a drum and a direct drive motor. As shown in a door opening structure diagram on the upper side of the drum wall, Figure 3A the drum wall 301 is provided with a door opening structure 302. When the drying device is in a working state, the door opening structure is in an unopenable state, that is, the lock catch device 303 is in a locked state. When the drying device is in a non-working state, the door opening structure is in an openable state, that is, the lock catch device 303 is in an openable state. The drum 301 is provided with a plurality of circular hole ventilation structures on both sides, as shown in Figure 3B the front side of the drum is connected with the outlet of the drying unit, and the rear side of the drum is connected with the inlet of the drying unit. So that the air in the drum can only flow from the inlet to the outlet, and no other leakage occurs. The mechanical shaft of the direct drive motor is connected with the drum to drive the drum to rotate according to a preset rule, which intersects with the belt drive, and the direct drive motor requires less space, thereby reducing the volume of the drying device.

[0070] Figure 4 The structure diagram of the drying device provided by another embodiment of the present application includes a shell 40 and a drum 41. The shell 40 is provided with a clothes feeding port 401. In an embodiment, the clothes feeding port 401 faces upward. The drum 41 is provided with a door opening structure 42.

[0071] When the drying device is in a working state, the drum 41 rotates under the driving of the direct-drive motor. At this time, the door opening device 42 cannot be opened, and the opening angle of the door opening device 42 changes with the rotation of the drum. When the drying device is in a non-working state, the drum 41 stops rotating. At this time, the door opening device 42 can be opened, and the opening angle of the door opening device 42 is the same as the orientation of the clothes feeding port 401, that is, upward.

[0072] Figure 5 The flowchart of the drying method provided by an embodiment of the present application is shown in FIG. 5. As shown in FIG. 5, the drying method provided by the present application includes the following steps. Figure 5

[0073] S501, the control unit acquires a start instruction.

[0074] The start instruction is an instruction indicating that the drying device starts to dry wet clothes. In an embodiment, the start instruction is an instruction input by a user through a control panel provided on the drying device. In another embodiment, the start instruction is an instruction sent by a terminal or a voice instruction of a user, which is received by a built-in wireless transmission module of the drying device.

[0075] The start instruction includes but is not limited to a drying time, a drying mode, a drying clothes type, and a weight.

[0076] S502, the control unit controls a heat pump unit and an auxiliary heating unit to provide dry hot air to a drying unit according to the start instruction.

[0077] The start instruction is acquired from step S501.

[0078] Controlling the heat pump unit and the auxiliary heating unit to provide dry hot air to the drying unit means that the control unit turns on the power supply switches of the heat pump unit and the auxiliary heating unit, so that the air in the heating unit obtains dry hot air. The dry hot air flows into the drying unit under the driving of a second air circulation fan.

[0079] S503, the control unit controls the drying unit to discharge humid hot air from an air outlet of the drying unit after the built-in wet clothes are fully mixed with the dry hot air.

[0080] The dry hot air is acquired from step S502.

[0081] ​The drying unit comprises a drum and a direct-drive motor.

[0082] The control unit controls the direct-drive motor in the drying unit to rotate according to a preset rotation sequence, angle and speed. The drum connected with the mechanical shaft of the direct-drive motor rotates in a following manner to ensure that the wet clothes are in sufficient contact with the air flowing in the drying unit, thereby ensuring the efficiency of the air in obtaining moisture to discharge the humid hot air from the air outlet of the drying unit.

[0083] S504, the control unit controls the first air inlet of the first heat exchange unit connected with the drying unit to receive the humid hot air, and after the first heat exchange unit completes the heat exchange operation, the dry cold air is provided to the first air inlet of the heat pump unit through the first air outlet of the first heat exchange unit.

[0084] The first air inlet of the first heat exchange unit receives the humid hot air obtained in step S503.

[0085] The heat exchange operation of the first heat exchange unit to obtain dry cold air has been described in detail in Figure 2 the corresponding embodiment, which will not be repeated here.

[0086] In the above technical solution, the control unit uses the dry cold air generated by the first heat exchange unit to reduce the temperature of the air obtained by the heat pump unit, so as to ensure that the heat pump unit and the auxiliary heating unit in the drying device work continuously at full power during the drying process, improve the heat exchange with the wet clothes in unit time, and improve the use efficiency of the auxiliary heating unit, thereby improving the drying efficiency of the drying device.

[0087] Figure 6 The flowchart of the drying method provided by another embodiment of the present application is shown in the figure. The execution subject of the method is a control unit. As Figure 6 shown, the drying method provided by the present application comprises:

[0088] S601, obtaining a start instruction.

[0089] The control instruction and the explanation of the obtained instruction have been described in detail in step S501, which will not be repeated here.

[0090] S602, according to the start instruction, controlling the heat pump unit and the auxiliary heating unit to provide dry hot air to the drying unit.

[0091] The start instruction is obtained in step S601.

[0092] The control unit controls the heat pump unit and the auxiliary heating unit to provide dry hot air to the drying unit, which has been described in detail in step S502, which will not be repeated here.

[0093] S603, the drying unit controls the built-in wet clothes to be fully mixed with the dry hot air, and then discharges the humid hot air from the air outlet of the drying unit.

[0094] The dry hot air is obtained from step S602, and the process of obtaining the humid hot air has been explained in detail in step S503, which will not be repeated here.

[0095] S604, obtain the temperature data obtained by the temperature sensing unit.

[0096] The temperature sensing unit is placed at the air outlet of the heat pump unit, and the temperature sensing unit includes a thermistor. The resistance of the thermistor changes with the temperature of the air, thereby affecting the electrical signal in the sensor. The changing electrical signal can be converted to obtain temperature data.

[0097] The control unit generates corresponding control instructions according to the preset temperature range and the temperature data. The preset temperature range includes a first preset temperature range, a second preset temperature range, and a third preset temperature range.

[0098] S605, generate a first control instruction according to the temperature data and the first preset temperature range, and send the first control instruction to the air duct adjusting unit to control the air duct adjusting unit to turn on the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turn off the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0099] The temperature data is obtained from step S604.

[0100] The first control instruction includes a drying unit working instruction, an auxiliary heating unit working instruction, a second air circulation fan working instruction, a heating pump working instruction, a third heat exchange unit working instruction, and an air duct adjusting unit working instruction. The air duct adjusting unit working instruction includes instructions for turning on the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and instructions for turning off the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0101] When the temperature data is within the first preset temperature range, the working state of the drying device is in the first stage, i.e. the initial heating stage. The working process of this stage has been explained in detail in the corresponding embodiment, which will not be repeated here. Figure 2

[0102] When the temperature data rises to exceed the first preset temperature range, step S606 is entered.

[0103] ​S606, generating a second control instruction according to the temperature data and a second preset temperature range, and sending the second control instruction to the air duct adjusting unit to control the air duct adjusting unit to close the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and to open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0104] The temperature data is obtained from step S604.

[0105] The lowest temperature of the second preset temperature range is a temperature that meets the drying operation of the drying device.

[0106] The second control instruction includes a drying unit operation instruction, an auxiliary heating unit operation instruction, a second air circulation fan operation instruction, a heat pump unit operation instruction, and an air duct adjusting unit operation instruction. The air duct adjusting unit operation instruction includes instructions to close the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and to open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit, i.e., the control unit controls the heat pump unit to deliver humid hot air from the air outlet of the heat pump unit to the second air inlet of the heat pump unit.

[0107] When the temperature data is within the second preset temperature range, the working state of the drying device is in the second stage, i.e., the initial drying stage. The working process of this stage has been explained in detail in the corresponding embodiment, and will not be repeated here. Figure 2

[0108] When the temperature data rises to exceed the second preset temperature range, step S607 is entered.

[0109] S607, generating a third control instruction according to the temperature data and a third preset temperature range, and sending the third control instruction to the air duct adjusting unit to control the air duct adjusting unit to open the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and to open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0110] The third control instruction includes a drying unit operation instruction, an auxiliary heating unit operation instruction, an air circulation unit operation instruction, a heat pump unit operation instruction, a first heat exchange unit control instruction, and an air duct adjusting unit operation instruction. The air duct adjusting unit operation instruction includes instructions to simultaneously open the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and to open the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

[0111] ​When the temperature data is in the third preset temperature range, the working state of the drying device is in the third stage, i.e., a full-power drying stage. The working state of this stage is that, on the basis of the working state of the drying device in the maintaining step S606, the air duct between the drying unit and the first heat exchange unit is simultaneously turned on to control the first air inlet of the first heat exchange unit connected with the drying unit to receive the humid hot air, after the first heat exchange unit completes the heat exchange operation, the dry cold air is provided to the third heat exchange unit in the heat pump unit through the second air outlet of the first heat exchange unit, and the air flowing out from the first air outlet of the first heat exchange unit and having a temperature lower than that of the heating pump is transported to the heating pump to reduce the temperature of the heating pump.

[0112] More specifically, the working process of this stage has been explained in detail in the Figure 2 corresponding embodiment, which will not be repeated here.

[0113] In the above technical solution, the drying process of the drying device is divided into three stages according to the temperature data of the output end of the heat pump unit. In the first stage, the units connected in the air duct of the drying device are heated to realize rapid temperature rise of the drying device in the initial starting stage. When the temperature meets the drying standard, the second stage is entered, and the heat pump unit can continuously warm up with the auxiliary heating unit without being affected by the input air temperature. When the temperature rises to the third stage of the working state of the drying device, the heat pump unit and the auxiliary heating unit can still work at full power due to the first heat exchange unit that transports the cooling cold air to the heat pump unit, so that the drying unit can always obtain the heat generated by the two heating units in the drying process, thereby improving the drying efficiency of the drying device.

[0114] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0115] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A drying apparatus, characterized by, The dryer comprises a control unit and a heat pump unit, an auxiliary heating unit, a first heat exchange unit and a drying unit receiving control instructions generated by the control unit. The input end of the auxiliary heating unit is connected with the output end of the heat pump unit, and the output end of the auxiliary heating unit is connected with the air inlet of the drying unit, so as to provide dry hot air for the drying unit by the heat pump unit and the auxiliary heating unit. The drying unit is used for fully mixing the dry hot air input from the air inlet with the wet clothes inside, and discharging humid hot air from the air outlet. The first air inlet of the first heat exchange unit is connected with the air outlet of the drying unit, and the air outlet of the first heat exchange unit is connected with the first air inlet of the heat pump unit, so as to provide dry cold air for the heat pump unit. The heat pump unit is also provided with a second air inlet. The air outlet of the drying unit is connected with the second air inlet of the heat pump unit, so as to process the humid hot air transmitted by the drying unit by the heat pump unit. The air outlet of the drying unit is provided with an air duct adjusting unit, and the air outlet of the heat pump unit is provided with a temperature sensing unit for obtaining temperature data of the air outlet. When the air duct adjusting unit receives the first control instruction generated and sent by the control unit according to the temperature data and a first preset temperature range, the air duct adjusting unit turns on the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turns off the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit. When the air duct adjusting unit receives the second control instruction generated and sent by the control unit according to the temperature data and a second preset temperature range, the air duct adjusting unit turns off the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turns on the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit. When the air duct adjusting unit receives the third control instruction generated and sent by the control unit according to the temperature data and a third preset temperature range, the air duct adjusting unit turns on the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turns on the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit. The dryer further comprises an air circulation unit, and the air circulation unit comprises a first air circulation fan.

2. The apparatus of claim 1, wherein, The second air inlet of the first heat exchange unit is provided with the first air circulation fan, and the first air circulation fan is used to deliver cold air outside the dryer into the first heat exchange unit, so that the first heat exchange unit performs heat exchange operation and condensation operation on the cold air and the humid hot air input from the first air inlet. When the air duct adjusting unit receives the first control instruction and the second control instruction, the first heat exchange unit stops heat exchange operation.

3. The drying apparatus according to claim 1, wherein When the air duct adjusting unit receives the third control instruction, the first heat exchange unit starts heat exchange operation. ​ 4. The drying apparatus according to claim 2, wherein The air circulation unit further comprises a second air circulation fan disposed between an air outlet of the heat pump unit and an input end of the auxiliary heating unit, to drive circulation of air in the drying device.

5. The drying apparatus according to claim 1, wherein The drying unit comprises a drum; The drum wall is provided with a door opening structure, which is in an unopenable state when the drying device is in a working state, and is in an openable state when the drying device is in a non-working state. The drum is provided with a plurality of circular hole ventilation structures on both sides, wherein the front side of the drum is connected with an air outlet of the drying unit, and the rear side of the drum is connected with an air inlet of the drying unit.

6. The drying apparatus according to claim 5, wherein When the door opening structure of the drum is in the openable state, the door opening structure is parallel to a clothes placing end of the drying device and is located at the upper end of the drum.

7. The drying apparatus according to claim 5, wherein The drying unit further comprises a direct drive motor; The mechanical shaft of the direct drive motor is connected with the drum, to drive the drum to rotate according to a preset rule.

8. A drying method of the drying apparatus as claimed in any one of claims 1 to 7, characterized in that, The method is applied to a control unit, and the method comprises: obtaining a start instruction; controlling a heat pump unit and an auxiliary heating unit to provide dry hot air to the drying unit according to the start instruction; controlling the drying unit to fully mix the built-in wet clothes with the dry hot air and then discharge humid hot air from an air outlet of the drying unit; controlling a first air inlet of a first heat exchange unit connected with the drying unit to receive the humid hot air, and providing dry cold air to a first air inlet of the heat pump unit through an air outlet of the first heat exchange unit after the first heat exchange unit completes heat exchange operation; controlling the air outlet of the drying unit to deliver humid hot air to a second air inlet of the heat pump unit; obtaining temperature data obtained by a temperature sensing unit; generating a first control instruction according to the temperature data and a first preset temperature range, and sending the first control instruction to an air duct adjusting unit, to control the air duct adjusting unit to turn on an air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turn off an air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit; generating a second control instruction according to the temperature data and a second preset temperature range, and sending the second control instruction to the air duct adjusting unit, to control the air duct adjusting unit to turn off the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turn on the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit; generating a third control instruction according to the temperature data and a third preset temperature range, and sending the third control instruction to the air duct adjusting unit, to control the air duct adjusting unit to turn on the air duct between the air outlet of the drying unit and the first air inlet of the heat pump unit, and turn on the air duct between the air outlet of the drying unit and the second air inlet of the heat pump unit.

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