Defrost system, dehumidifier and dehumidifier control method

Abstract

This invention relates to the field of defrosting, and more particularly to a defrosting system, a dehumidifier, and a control method for the dehumidifier. The defrosting system includes a cold air duct; a hot air duct, arranged separately from the cold air duct; an evaporator disposed within the cold air duct; a guide air duct connecting the hot and cold air ducts; and a guide air duct opening and closing mechanism disposed at the connection point between the guide air duct and the hot air duct, the mechanism having an open state (open connection point) and a closed state (closed connection point). When the guide air duct opening and closing mechanism is in the open state, hot air from the hot air duct enters the cold air duct through the guide air duct to defrost the evaporator. Applying the technical solution of this invention, using hot air from the hot air duct to defrost the evaporator enables continuous defrosting with short defrosting time, thus improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of defrosting, and more particularly to a defrosting system, a dehumidifier, and a control method for the dehumidifier. Background Technology

[0002] When the ambient temperature is low, the cold air condenses on the surface of the evaporator during heat exchange, making it easy for frost to form on the evaporator surface. This reduces the heat exchange efficiency of the evaporator and affects the dehumidification effect. In related technologies, the defrosting method is generally used to allow the frost on the evaporator surface to melt slowly. However, this method results in slow defrosting of the evaporator, and prolonged shutdown affects the user experience. Summary of the Invention

[0003] To address the technical problem of dehumidifiers needing to be shut down for defrosting in related technologies, a defrosting system, a dehumidifier, and a control method for the dehumidifier are proposed.

[0004] According to one aspect of the present invention, a defrosting system is provided, comprising: a cold air duct; a hot air duct arranged separately from the cold air duct; an evaporator disposed within the cold air duct; a guide air duct for connecting the hot air duct and the cold air duct; and a guide air duct opening and closing mechanism disposed at the connection port between the guide air duct and the hot air duct, the guide air duct opening and closing mechanism having an open state for opening the connection port and a closed state for closing the connection port; when the guide air duct opening and closing mechanism is in the open state, hot air in the hot air duct enters the cold air duct through the guide air duct to defrost the evaporator.

[0005] Furthermore, the airflow duct opening and closing mechanism includes: a partition plate, which is rotatably disposed at the connection port, and the partition plate has an open position for opening the connection port and a closed position for closing the connection port; an elastic element, which is disposed between the airflow duct wall and the partition plate; the partition plate is in the closed position under the action of the elastic element; the partition plate overcomes the force of the elastic element under the action of external force and rotates from the closed position to the open position.

[0006] Furthermore, the defrosting system also includes: a hot runner exhaust vent connected to the hot runner duct; a hot runner exhaust vent opening and closing mechanism, which is located at the hot runner exhaust vent and has an open state for opening the hot runner exhaust vent and a closed state for closing the hot runner exhaust vent; when the hot runner exhaust vent opening and closing mechanism is in the closed state, the pressure inside the hot runner duct rises, and the baffle rotates from the closed position to the open position under the action of airflow pressure.

[0007] Furthermore, the defrosting system also includes: a temperature sensor, which is installed on the copper tubes of the evaporator to detect the temperature of the copper tubes; and a controller, which is electrically connected to both the temperature sensor and the hot runner exhaust vent opening and closing mechanism. The controller is used to acquire the temperature of the evaporator and control the opening and closing of the hot runner exhaust vent according to the temperature.

[0008] Furthermore, the airflow duct opening and closing mechanism also includes a drive unit, which is connected to the partition plate for driving the partition plate to rotate.

[0009] Furthermore, the airflow duct opening and closing mechanism includes: a windbreak part, which is movably disposed at the connection port, and the windbreak part has an open state of opening the connection port and a closed state of closing the connection port; and a drive part, which is drivenly connected to the windbreak part and is used to drive the windbreak part to switch between the open state and the closed state.

[0010] Furthermore, the defrosting system also includes: a temperature sensor, which is installed on the copper tubes of the evaporator to detect the temperature of the copper tubes; and a controller, which is electrically connected to both the temperature sensor and the drive unit, and is used to acquire the temperature of the evaporator and control the opening and closing of the connection port according to the temperature.

[0011] Furthermore, the defrosting system also includes: an air supply component, one end of which is connected to the air duct, and the other end of which extends to the front of the evaporator. The air supply component has an air outlet that is positioned opposite to the evaporator. After the hot air in the hot air duct enters the air duct, it is blown toward the evaporator through the air outlet of the air supply component to defrost the evaporator.

[0012] Furthermore, the positions of the air outlets are set to correspond to the frosting positions of the copper tubes of the evaporator; the number of air outlets set to correspond to the frosting positions of the copper tubes of the evaporator is greater than the number of air outlets set to correspond to the non-frosting positions of the copper tubes of the evaporator.

[0013] Furthermore, the air supply assembly includes multiple air inlet grilles spaced apart, with air outlets positioned between two adjacent air inlet grilles, allowing airflow outside the defrosting system to enter the cold air duct through the air supply assembly; and / or the air supply assembly includes a filter screen, allowing airflow outside the defrosting system to enter the cold air duct after being filtered by the air supply assembly.

[0014] According to another aspect of the present invention, a dehumidifier is provided, the dehumidifier including the above-described defrosting system; the dehumidifier further includes: a cold-end fan disposed in a cold airflow duct; a hot-end fan disposed in a hot airflow duct; a condenser disposed in a hot airflow duct; a compressor connected to both the condenser and the evaporator; the dehumidifier having a defrosting mode and a dehumidifying mode.

[0015] According to another aspect of the present invention, a control method for a dehumidifier is provided. The control method includes: controlling the compressor, cold-end fan, and hot-end fan of the dehumidifier to start, so that the dehumidifier starts operating in dehumidification mode; after the compressor has been running for a first predetermined time, using a temperature sensor to detect the temperature of the evaporator in real time; when the temperature of the evaporator detected by the temperature sensor within a second predetermined time is lower than a first set temperature, controlling the dehumidifier to switch from dehumidification mode to defrost mode; when the temperature of the evaporator detected by the temperature sensor within a third predetermined time is higher than a second set temperature, controlling the dehumidifier to switch from defrost mode to dehumidification mode.

[0016] By applying the technical solution of this invention, hot air in the hot air duct is used to defrost the evaporator, which can achieve defrosting without stopping the machine, with a short defrosting time, which is beneficial to improving the user experience. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a dehumidifier according to an optional embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 A cross-sectional view of the dehumidifier in the diagram;

[0019] Figure 3 It shows Figure 1 A schematic diagram of the hot airflow direction of a dehumidifier in dehumidification mode.

[0020] Figure 4 It shows Figure 1 A schematic diagram of the airflow direction of the dehumidifier in dehumidification mode;

[0021] Figure 5 It shows Figure 1 A schematic diagram of the airflow direction of a dehumidifier in defrost mode;

[0022] Figure 6 A schematic diagram of the assembly structure of the temperature sensor and the evaporator is shown;

[0023] Figure 7 A schematic diagram showing the positional relationship between the airflow guide duct and the cold airflow duct is provided.

[0024] Figure 8 A schematic diagram of the assembly structure of the air duct, the air duct opening and closing mechanism, and the air supply assembly is shown.

[0025] Figure 9 This invention provides a schematic diagram of the structure of an optional embodiment of the airflow guiding duct opening and closing mechanism.

[0026] Figure 10 A schematic diagram of the structure of an air supply assembly according to an optional embodiment of this application is shown;

[0027] Figure 11 This invention provides a schematic diagram of the air supply assembly from another angle, representing one alternative embodiment of the present application.

[0028] Figure 12 This illustration shows a structural schematic diagram of the air supply assembly of an optional embodiment of this application from yet another angle;

[0029] Figure 13 A logic flowchart of a dehumidifier control method according to an optional embodiment of this application is shown.

[0030] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0031] In the attached diagram:

[0032] 1. Cold air duct; 2. Hot air duct; 3. Evaporator; 4. Guide air duct; 5. Guide air duct opening and closing mechanism; 51. Baffle; 52. Elastic element; 6. Exhaust outlet; 7. Temperature sensor; 8. Copper pipe; 9. Air supply assembly; 91. Air outlet; 92. Air inlet grille; 93. Filter screen; 94. Air inlet; 10. Cold end fan; 11. Hot end fan; 12. Condenser; 13. Compressor. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] To address the technical problem that dehumidifiers in related technologies require shutdown for defrosting, this invention provides a defrosting system, a dehumidifier, and a control method for the dehumidifier.

[0035] like Figures 1 to 12As shown, this application provides a defrosting system, including: a cold air duct 1; a hot air duct 2, arranged separately from the cold air duct 1; an evaporator 3 disposed within the cold air duct 1; a guide air duct 4 connecting the hot air duct 2 and the cold air duct 1; and a guide air duct opening and closing mechanism 5 disposed at the connection point between the guide air duct 4 and the hot air duct 2, the guide air duct opening and closing mechanism 5 having an open state (open connection point) and a closed state (closed connection point). When the guide air duct opening and closing mechanism 5 is in the open state, hot air from the hot air duct 2 enters the cold air duct 1 through the guide air duct 4 to defrost the evaporator 3. In this way, the hot air from the hot air duct 2 can be used to defrost the evaporator 3, enabling defrosting without stopping the system, with a short defrosting time, which improves the user experience.

[0036] like Figure 9 As shown, optionally, the airflow duct opening and closing mechanism 5 includes: a partition 51, which is rotatably disposed at the connection port, and has an open position for opening the connection port and a closed position for closing the connection port; an elastic element 52, which is disposed between the airflow duct wall of the airflow duct 4 and the partition 51; the partition 51 is in the closed position under the action of the elastic element 52; the partition 51 overcomes the force of the elastic element 52 under the action of an external force and rotates from the closed position to the open position. Thus, when defrosting of the evaporator 3 is required, the baffle 51 rotates from the closed position to the open position under the action of external force, overcoming the force of the elastic element 52. The airflow duct opening and closing mechanism 5 is in the open state, and the hot airflow duct 2 is connected to the cold airflow duct 1. Hot air enters the cold airflow duct 1 to defrost the evaporator 3. After defrosting is completed, the external force is removed, and the baffle 51 returns to the closed position under the action of the elastic element 52. The airflow duct opening and closing mechanism 5 is in the closed state, and the hot airflow duct 2 is not connected to the cold airflow duct 1.

[0037] Optionally, the elastic element 52 is a spring.

[0038] like Figures 2 to 5 As shown, optionally, the defrosting system further includes: a hot runner exhaust vent 6, connected to the hot runner duct 2; and an exhaust vent opening and closing mechanism (not shown), which is located at the hot runner exhaust vent 6 and has an open state (open) and a closed state (closed). When the exhaust vent opening and closing mechanism is in the closed state, the pressure inside the hot runner duct 2 rises, and the baffle 51 rotates from the closed position to the open position under the action of airflow pressure. Thus, by controlling the opening and closing of the hot runner exhaust vent 6, the opening and closing of the baffle 51 is controlled, thereby achieving defrosting without shutting down the system.

[0039] like Figure 6As shown, optionally, the defrosting system also includes: a temperature sensor 7, which is installed on the copper tube 8 of the evaporator 3 to detect the temperature of the copper tube 8 of the evaporator 3; and a controller, which is electrically connected to both the temperature sensor 7 and the exhaust vent opening and closing mechanism. The controller is used to acquire the temperature of the evaporator 3 and control the opening and closing of the hot runner exhaust vent 6 according to the temperature. In this way, through the cooperation of the temperature sensor 7, the controller, and the exhaust vent opening and closing mechanism, automatic defrosting without stopping the system is achieved.

[0040] Specifically, when the temperature sensor 7 detects that the temperature of the evaporator 3 is lower than the predetermined temperature, it controls the hot runner exhaust port 6 to close, and the baffle 51 rotates to the open position under the action of airflow pressure, so that the hot air in the hot runner duct 2 enters the cold runner duct 1 to automatically defrost the evaporator 3; when the temperature sensor 7 detects that the temperature of the evaporator 3 is higher than the predetermined temperature, it controls the hot runner exhaust port 6 to open, and the baffle 51 rotates to the closed position under the action of the elastic element 52, so that the hot runner duct 2 and the cold runner duct 1 are not connected.

[0041] Optionally, in an optional embodiment not shown in this application, the airflow duct opening and closing mechanism 5 further includes a driving unit, which is drivenly connected to the partition 51 and used to drive the partition 51 to rotate. In this way, by using the driving unit to control the rotation of the partition 51, defrosting can be achieved without shutting down the system.

[0042] Optionally, the drive unit is a stepper motor.

[0043] Optionally, in an optional embodiment not shown in this application, the airflow duct opening and closing mechanism 5 includes: a windbreak portion, movably disposed at the connecting port, the windbreak portion having an open state (opening the connecting port) and a closed state (closing the connecting port); and a drive portion, drivenly connected to the windbreak portion, used to drive the windbreak portion to switch between the open and closed states. Thus, by controlling the movement of the windbreak portion using the drive portion, defrosting without shutting down the system is achieved.

[0044] Optionally, in an optional embodiment not shown in this application, the windbreak part is a windbreak plate that is rotatably or movably disposed at the communication port, and the driving part is a drive motor. The drive motor is used to drive the windbreak plate to rotate or move, thereby realizing the opening and closing control of the communication port.

[0045] Optionally, the angle of the connection opening should be determined by a combination of factors, including system air volume, spring torque, and the size and number of air outlets.

[0046] like Figure 6As shown, optionally, the defrosting system further includes: a temperature sensor 7, which is installed on the copper tube 8 of the evaporator 3 to detect the temperature of the copper tube 8; and a controller, which is electrically connected to both the temperature sensor 7 and the drive unit, and is used to acquire the temperature of the evaporator 3 and control the opening and closing of the connection port according to the temperature. In this way, the temperature of the copper tube 8 is detected by the temperature sensor 7, and when the temperature of the copper tube 8 is low, hot air is used for defrosting.

[0047] like Figure 8 As shown, optionally, the defrosting system further includes: an air supply assembly 9, one end of which is connected to the air duct 4, and the other end of which extends to the front of the evaporator 3. The air supply assembly 9 has an air outlet 91 disposed opposite to the evaporator 3. After the hot air in the hot air duct 2 enters the air duct 4, it is blown towards the evaporator 3 through the air outlet 91 of the air supply assembly 9 to defrost the evaporator 3. In this way, by using the air supply assembly 9 to deliver the hot air in the hot air duct 2 to one side of the evaporator 3 to defrost the evaporator 3, the defrosting effect is better.

[0048] Optionally, the positions of the air outlets 91 are set to correspond to the frosted positions of the copper tubes 8 of the evaporator 3; the number of air outlets 91 set to correspond to the frosted positions of the copper tubes 8 of the evaporator 3 is greater than the number of air outlets 91 set to correspond to the unfrosted positions of the copper tubes 8 of the evaporator 3. In this way, the evaporator 3 is defrosted more effectively and the defrosting effect is better.

[0049] The location and degree of frost formation on copper pipes vary in different dehumidification systems, therefore the required hot air volume for defrosting at different locations on the evaporator also varies. The location and number of air outlets can be specifically designed to deliver air for defrosting based on the locations of the copper pipes prone to frost in the dehumidification system.

[0050] like Figure 8 , Figures 10 to 12 As shown, optionally, the air supply assembly 9 includes a plurality of air inlet grilles 92 spaced apart, and an air outlet 91 is disposed between two adjacent air inlet grilles 92. Airflow outside the defrosting system enters the cold air duct 1 through the air supply assembly 9. In this way, the air inlet grilles 92 and the air supply assembly 9 are integrated into one unit, which facilitates assembly and saves space.

[0051] like Figure 8 , Figures 10 to 12 As shown, optionally, the air supply assembly 9 includes a filter 93. Airflow outside the defrosting system enters the cold air duct 1 after being filtered by the air supply assembly 9. This integration of the filter 93 and the air supply assembly 9 facilitates assembly and saves space. The air supply assembly 9 combines the functions of evaporator fresh air filtration and uniform airflow defrosting in automatic defrosting mode.

[0052] The fresh air filtration function refers to the dehumidification mode where fresh air first passes through a filter, then enters the evaporator for heat exchange and dehumidification, and is then blown out as cool air. This is mainly to prevent dust accumulation on the evaporator, which can lead to poor heat exchange and affect the machine's performance.

[0053] like Figures 1 to 7 As shown, this application also provides a dehumidifier, which includes the aforementioned defrosting system; the dehumidifier further includes: a cold-end fan 10, which is disposed within the cold airflow duct 1; a hot-end fan 11, which is disposed within the hot airflow duct 2; a condenser 12, which is disposed within the hot airflow duct 2; and a compressor 13, which is connected to both the condenser 12 and the evaporator 3; the dehumidifier has a defrosting mode and a dehumidification mode. When the dehumidifier is in dehumidification mode, the cold airflow duct 1 and the hot airflow duct 2 are not connected. When the dehumidifier is in defrosting mode, the cold airflow duct 1 and the hot airflow duct 2 are connected through the guide airflow duct 4, and the hot air in the hot airflow duct 2 is used to defrost the evaporator 3 in the cold airflow duct 1, which can achieve defrosting without stopping the machine, thus improving the user experience.

[0054] like Figure 13 As shown, this application also provides a control method for a dehumidifier. The control method includes: controlling the start of the dehumidifier's compressor 13, cold-end fan 10, and hot-end fan 11, causing the dehumidifier to start operating in dehumidification mode; after the compressor 13 runs for a first predetermined time, the temperature of the evaporator 3 is detected in real time using a temperature sensor 7; when the temperature of the evaporator 3 detected by the temperature sensor 7 within a second predetermined time is lower than a first set temperature, the dehumidifier is controlled to switch from dehumidification mode to defrost mode; when the temperature of the evaporator 3 detected by the temperature sensor 7 within a third predetermined time is higher than the second set temperature, the dehumidifier is controlled to switch from defrost mode back to dehumidification mode. Thus, the dehumidifier provided by this application can switch between dehumidification mode and defrost mode according to the temperature of the evaporator 3, achieving automatic defrosting.

[0055] This application enables the automatic defrosting function without stopping the machine by utilizing the independent hot air circulation of a cold air type dehumidifier.

[0056] In one specific embodiment of this application, the dehumidifier includes an air supply assembly 9, a guide duct 4, and a guide duct opening and closing mechanism 5, wherein the guide duct opening and closing mechanism 5 is an elastic baffle assembly. The air supply assembly 9 is designed on the left side of the guide duct 4, and the elastic baffle assembly is designed on the right side of the guide duct 4 and connected to the hot flow duct 2. The elastic baffle assembly has a unidirectional channel structure design, allowing fluid to flow only from the hot flow duct to the evaporator side when open. Figure 5 As shown. Figure 9As shown, the key feature of the elastic partition assembly is that it is designed with an elastic element 52 and a partition 51. The elastic element is a double spring, which is connected to the partition 51 to form an openable and closable partition assembly. The air supply assembly 9 can evenly deliver the circulating hot air in the guide air duct 4 to the evaporator 3 for heat exchange and defrosting. Figure 10 As shown, its key features include multiple air inlet grilles 92 and several air outlets 91, which ensure uniform airflow to the evaporator 3 in defrost mode, enhancing the defrosting effect. Furthermore, the air supply assembly also includes an air inlet 94 for connecting to the guide air duct 4 to deliver hot air. Furthermore, the air supply assembly 9 is located on the air inlet side of the evaporator 3 and can be integrated with the filter screen 93, reducing the number of parts. That is, the air supply assembly 9 of this application has the function of uniform airflow defrosting in automatic defrost mode, and can also serve as a fresh air filter. The dehumidifier of this application is a cold air dehumidifier, with the cold air duct 1 and the hot air duct 2 completely separated. Each duct has its own motor, and each duct has its own cold-end fan 10 and hot-end fan 11, with independent airflow circulation within each duct. One end of the guide air duct 4 is connected to the hot air duct 2, and the air supply assembly 9 extends to the front of the evaporator 3. A condenser 12 is arranged on the right side of the hot runner duct 2, with a hot runner exhaust port 6 at its upper end. The hot runner exhaust port 6 can be automatically controlled to open and close. A temperature sensor 7 is installed on the side of the evaporator 3, which monitors the temperature of the copper tubes 8 of the evaporator 3 in real time. The temperature sensor 7 detects different copper tube 8 temperatures depending on the frosting condition of the evaporator 3. When the evaporator 3 is frosted, the temperature detected by the temperature sensor 7 decreases. The cold end fan 10 includes centrifugal fan blades, and the hot end fan 11 includes cross-flow fan blades. Both the centrifugal fan blades and the cross-flow fan blades are placed between the evaporator and the condenser.

[0057] like Figure 13 As shown, the first set temperature T1 is the evaporator tube temperature when the system enters automatic defrost mode, and the second set temperature T2 is the evaporator tube temperature when the system exits automatic defrost mode. When the unit is powered on, the compressor 13, cold-end fan 10, and hot-end fan 11 all start, the hot runner exhaust vent 6 opens, and the unit begins dehumidification mode operation. After the compressor 13 runs continuously for 30 minutes, the temperature sensor monitors the evaporator tube temperature in real time, T01, T02, ..., Ti. When the evaporator tube temperature Ti is detected to be less than the first set temperature T1 for 1 minute, the system enters automatic defrost mode, at which time the hot runner exhaust vent 6 is closed by controlling the air guide plate of the exhaust vent opening and closing mechanism. Figure 5 As shown in the diagram, the airflow direction in the hot runner is as follows in automatic defrost mode. During this mode, the pressure inside the hot runner gradually increases until the spring baffle in the circulation guide mechanism is forced open by the pressure, allowing hot air to be introduced to the evaporator side for defrosting. In automatic defrost mode, when the evaporator tube temperature Ti > the second set temperature T2 is detected for 1 minute, the system exits automatic defrost mode. Figure 3 The diagram shows the airflow direction of the hot runner in dehumidification mode. At this time, the hot runner exhaust port is opened, the pressure inside the hot runner decreases, the spring baffle closes, and finally all the air that has exchanged heat with the condenser in the hot runner will be discharged from the hot runner exhaust port outside the whole unit, and the system will resume dehumidification mode operation.

[0058] This application solves the problem of poor heat exchange caused by evaporator frosting in cold air dehumidifiers under low temperature conditions, while improving the user experience when the whole machine enters defrosting mode.

[0059] Addressing the issue of existing cold air dehumidifiers having separate hot and cold runner channels, this invention provides a structure that utilizes the hot air from the hot runner of a cold air dehumidifier. When the evaporator frosts, the system automatically controls the flow of hot air from the hot runner to the evaporator for defrosting, thereby improving the evaporator's heat exchange efficiency. Simultaneously, the compressor operates normally during both the entry and exit of automatic defrosting mode. The system maintains continuous defrosting without stopping, enhancing the user experience.

[0060] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0063] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A defrosting system, characterized in that, include: Cold air duct (1); The hot air duct (2) is arranged separately from the cold air duct (1); Evaporator (3), the evaporator (3) is disposed in the cold air duct (1); A guide air duct (4) is used to connect the hot air duct (2) and the cold air duct (1). A guide air duct opening and closing mechanism (5) is provided at the connection port between the guide air duct (4) and the hot air duct (2). The guide air duct opening and closing mechanism (5) has an open state for opening the connection port and a closed state for closing the connection port. When the guide air duct opening and closing mechanism (5) is in the open state, the hot air in the hot air duct (2) enters the cold air duct (1) through the guide air duct (4) to defrost the evaporator (3). The airflow guiding duct opening and closing mechanism (5) includes: A partition (51) is rotatably disposed at the communication port, and the partition (51) has an open position for opening the communication port and a closed position for closing the communication port; An elastic element (52) is disposed between the duct wall of the air guide duct (4) and the partition plate (51); The partition (51) is in the closed position under the action of the elastic member (52); the partition (51) overcomes the force of the elastic member (52) under the action of external force and rotates from the closed position to the open position; The defrosting system also includes: The hot runner exhaust port (6) is connected to the hot runner duct (2); An exhaust vent opening and closing mechanism is provided at the hot runner exhaust vent (6). The exhaust vent opening and closing mechanism has an open state of opening the hot runner exhaust vent (6) and a closed state of closing the hot runner exhaust vent (6). When the exhaust port opening and closing mechanism is in the closed state, the pressure in the hot air duct (2) rises, and the baffle (51) rotates from the closed position to the open position under the action of airflow pressure.

2. The defrosting system according to claim 1, characterized in that, The defrosting system also includes: An air supply assembly (9) is provided. One end of the air supply assembly (9) is connected to the air guide duct (4), and the other end of the air supply assembly (9) extends to the front side of the evaporator (3). The air supply assembly (9) has an air outlet (91) that is disposed opposite to the evaporator (3). After the hot air in the hot air flow duct (2) enters the air guide duct (4), it is blown toward the evaporator (3) through the air outlet (91) of the air supply assembly (9) to defrost the evaporator (3).

3. The defrosting system according to claim 2, characterized in that, The position of the air outlet (91) is set to correspond to the frost position of the copper tube (8) of the evaporator (3); The number of air outlets (91) corresponding to the frosted position of the copper tube (8) of the evaporator (3) is greater than the number of air outlets (91) corresponding to the unfrosted position of the copper tube (8) of the evaporator (3).

4. The defrosting system according to claim 2, characterized in that, The air supply assembly (9) includes a plurality of spaced-apart air inlet grilles (92), and the air outlet (91) is disposed between two adjacent air inlet grilles (92). Airflow outside the defrosting system enters the cold air duct (1) through the air supply assembly (9); and / or The air supply assembly (9) includes a filter (93), and the airflow outside the defrosting system enters the cold air duct (1) after being filtered by the air supply assembly (9).

5. The defrosting system according to any one of claims 1-4, characterized in that, The airflow duct opening and closing mechanism (5) also includes: The driving unit is connected to the partition (51) and is used to drive the partition (51) to rotate.

6. The defrosting system according to claim 5, characterized in that, The defrosting system also includes: Temperature sensor (7), the temperature sensor (7) is disposed on the copper tube (8) of the evaporator (3) for detecting the temperature of the copper tube (8) of the evaporator (3); The controller is electrically connected to the temperature sensor (7) and the exhaust port opening and closing mechanism. The controller is used to obtain the temperature of the evaporator (3) and control the exhaust port opening and closing mechanism to open and close the hot runner exhaust port (6) according to the temperature.

7. A dehumidifier, characterized in that, The dehumidifier includes the defrosting system according to any one of claims 1 to 5; the dehumidifier further includes: Cold end fan (10), the cold end fan (10) is installed in the cold air duct (1); Hot end fan (11), the hot end fan (11) is installed in the hot flow duct (2); A condenser (12) is disposed within the hot air duct (2); The compressor (13) is connected to both the condenser (12) and the evaporator (3); The dehumidifier has a defrosting mode and a dehumidifying mode.

8. A dehumidifier, characterized in that, The dehumidifier includes the defrosting system as described in claim 6; the dehumidifier further includes: Cold end fan (10), the cold end fan (10) is installed in the cold air duct (1); Hot end fan (11), the hot end fan (11) is installed in the hot flow duct (2); A condenser (12) is disposed within the hot air duct (2); The compressor (13) is connected to both the condenser (12) and the evaporator (3); The dehumidifier has a defrosting mode and a dehumidifying mode.

9. A control method for the dehumidifier of claim 8, characterized in that, The control method includes: The compressor (13), cold end fan (10) and hot end fan (11) of the dehumidifier are all started, so that the dehumidifier starts to run in dehumidification mode; After the compressor (13) has been running for a predetermined time, the temperature of the evaporator (3) is detected in real time using the temperature sensor (7); When the temperature sensor (7) detects that the temperature of the evaporator (3) is lower than the first set temperature within a second predetermined time, the dehumidifier is controlled to switch from dehumidification mode to defrost mode. When the temperature sensor (7) detects that the temperature of the evaporator (3) is greater than the second set temperature within a third predetermined time, the dehumidifier is controlled to switch from defrosting mode to dehumidifying mode.

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