Portable defrosting device, air cooler and defrosting method

Abstract

This invention discloses a portable defrosting device, a cooler, and a defrosting method. The portable defrosting device includes: a chassis assembly disposed at the bottom of a heat exchanger; the chassis assembly is divided into multiple frosting zones; a drive structure mounted on the chassis assembly, with a heating element connected to its drive end; and frosting sensors for detecting frosting thickness, each located within one of the frosting zones. The drive structure can drive the heating element to move to different frosting zones. By monitoring the frost distribution in real time through the frosting sensors, and then driving the heating element to move to the heavily frosted zones, precise defrosting is achieved, avoiding ineffective heating of frost-free areas and resulting in lower energy consumption.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a portable defrosting device, a cold air blower, and a defrosting method. Background Technology

[0002] In low-temperature cold storage, evaporators are the core heat exchange equipment. During long-term operation, the surface of their evaporators gradually frosts due to the condensation of water vapor in the air. When the frost layer is too thick, it significantly reduces heat exchange efficiency, increases fan energy consumption, and can even cause serious malfunctions such as liquid carryover in the refrigeration system and compressor damage. Therefore, evaporators need to be defrosted regularly. Currently, hot refrigerant defrosting technology has become the preferred defrosting method for large cold storage facilities in the industry due to its advantages such as requiring no additional electricity for heating and high defrosting efficiency. This technology uses a four-way reversing valve to directly introduce the high-temperature, high-pressure gaseous refrigerant discharged from the compressor into the evaporator coil. The sensible and latent heat carried by the refrigerant itself quickly melts the frost layer on the outer surface of the coil, thus achieving efficient defrosting without shutting down the system and without requiring additional electricity.

[0003] At the same time, to prevent the defrost water from freezing again at the drain outlets of the chassis and drip tray, such as Figure 1 As shown, multiple fixed electric heating elements 200 are typically installed below the chassis 100, often requiring four or more elements. This is to ensure that all heating elements 200 are simultaneously energized and heated during or slightly before the defrosting cycle begins. The aim is to maintain the metal wall temperature of the chassis 100 above freezing point through radiation and convection heat transfer, thus preventing frost buildup in the entire chassis 100 area. However, this traditional fixed electric heating element layout has the following drawbacks:

[0004] First, the multiple electric heating elements 200 and their associated electrical components, mounting brackets, and junction boxes significantly increase the equipment manufacturing cost. Furthermore, regardless of whether there is a genuine risk of frost buildup in any part of the chassis 100, all electric heating elements 200 must operate at full power during every defrosting cycle, resulting in severe "ineffective energy consumption" and wasted electricity. Second, in actual operation, frost accumulation on the chassis 100 exhibits significant regional selectivity (for example, thicker frost layers are found at the bottom of the evaporator's windward side, near the drain outlet, and in airflow dead zones), easily leading to over-defrosting in some areas and residual frost in others, resulting in a severely uneven distribution of the defrosting heat field. Finally, the large number of electric heating elements 200, complex wiring, numerous potential failure points, and a significant workload for replacement and maintenance. Summary of the Invention

[0005] This invention provides a portable defrosting device, a cold air blower, and a defrosting method to solve the problem that existing fixed electric heating tube layout schemes ineffectively heat frost-free areas and consume a lot of energy.

[0006] The technical solution adopted in this invention is to design a portable defrosting device, comprising:

[0007] A chassis assembly is provided at the bottom of the heat exchanger; the chassis assembly is divided into multiple frosting zones.

[0008] A drive structure is mounted on the chassis assembly, and a heating element is connected to the drive end of the drive structure;

[0009] Frost sensors are respectively disposed in all the frost areas; the frost sensors are used to detect the frost thickness;

[0010] The drive structure can drive the heating element to move to the frosting area on the chassis assembly.

[0011] Beneficial effects: By monitoring the frost distribution in the frost area in real time through the frost sensor, the drive structure drives the heating element to move to the frost area on the chassis assembly, thereby achieving precise defrosting, avoiding ineffective heating of frost-free areas, resulting in lower energy consumption, and ensuring a uniform distribution of the defrosting heat field, avoiding the phenomenon of over-defrosting in some areas and residual frost in others.

[0012] Compared to the traditional fixed electric heating tube layout, this invention eliminates the need for multiple electric heating tubes and their associated electrical components, mounting brackets, and junction boxes, thereby reducing manufacturing costs and the workload of replacement and maintenance.

[0013] Furthermore, the driving structure is a lead screw drive structure, which includes:

[0014] A lead screw is disposed on one side of the chassis assembly in the width direction and extends along the length direction of the chassis assembly;

[0015] The first slide rail is disposed on the other side of the width direction of the chassis assembly and extends along the length direction of the chassis assembly;

[0016] A threaded fitting component that engages with the threaded screw;

[0017] The first slider slides in conjunction with the first slide rail.

[0018] A heating element is horizontally positioned between the lead screw and the first slide rail, with one end connected to the threaded fitting and the other end connected to the first slider.

[0019] The first driving source has its driving end connected to the lead screw drive, which drives the lead screw to rotate, causing the threaded mating part to move along the lead screw, and then causing the heating element to move along the length direction of the chassis assembly.

[0020] Beneficial effects: Firstly, it offers high stability and excellent displacement accuracy of the heating element. The dual-guide support structure, consisting of a lead screw and nut pair and a first slide rail and slider pair, connects the heating element at one end to the threaded fitting and at the other end to the first slider. This ensures that both ends of the heating element are synchronously constrained during translation, effectively preventing swaying, twisting, or jamming caused by single-end cantilever drive. It guarantees that the displacement trajectory of the heating element along the length of the base is an ideal straight line, thus significantly improving the positioning accuracy of the heating element in the frosting area.

[0021] Secondly, by providing auxiliary support to the heating element through the first slide rail, the weight of the heating element and the vibration load that may be generated during operation are shared by the lead screw and the first slide rail, reducing the unilateral force burden on the lead screw and nut pair and extending the service life of the lead screw.

[0022] Thirdly, the lead screw and the first slide rail are respectively set on both sides of the width direction of the base, and the heating element is horizontally set between the two. The first drive source is connected to the lead screw drive. The overall layout makes full use of the space on both sides of the width of the base, and the middle area provides unobstructed passage space for the heating element to move horizontally, which is convenient for the installation, debugging and maintenance of the heating element.

[0023] Furthermore, a bearing housing is rotatably connected to the end of the lead screw away from the first drive source, and the bearing housing is mounted on the chassis assembly.

[0024] Beneficial effects: The main function of the bearing housing is to provide radial and axial rotational support for the end of the lead screw furthest from the first drive source (i.e., the free end). This ensures stable support at both ends of the lead screw when it is driven to rotate by the first drive source, effectively suppressing radial runout and axial movement that may occur due to the lead screw's large length and high rotational speed, thus ensuring smooth operation. Simultaneously, the bearing housing and the output end of the first drive source are located at opposite ends of the lead screw, forming a stable simply supported structure. Compared to a cantilever layout that relies solely on the output end of the first drive source for support, this significantly enhances the lead screw's bending rigidity, preventing positional shifts or movement jamming of the heating element during translation due to lead screw bending deformation. This ensures the straightness and repeatability of the heating element's translation along the base's length, extending the overall service life of the lead screw and drive structure.

[0025] Furthermore, both the threaded fitting and the first slider are provided with a first fixing clip, which is used to clamp and fix the corresponding two ends of the heating element.

[0026] Beneficial effects: The first fixing clamp provides circumferential restraint to the end of the heating element. Combined with the clamping force generated by the fasteners, this ensures no relative displacement between the end of the heating element and the threaded mating part and the first slider in both the horizontal and vertical directions. This allows the heating element to reliably move synchronously with the screw and nut assembly. Furthermore, the first fixing clamp adopts a split, detachable structure. When the heating element needs replacement or maintenance, simply loosening the fasteners allows the first fixing clamp to be detached from the threaded mating part and the first slider, enabling the removal of the heating element without disassembling the screw and nut assembly and the first slide rail slider assembly, significantly improving the ease of assembly and disassembly of the heating element. In addition, the sleeve-type design of the first fixing clamp ensures that the clamping force is evenly distributed along the circumference of the heating element, preventing surface damage or deformation caused by excessive force at localized points of contact, thus protecting the structural integrity of the heating element.

[0027] Furthermore, the driving structure is a gear and rack transmission structure, which includes:

[0028] A rack is disposed on one side of the chassis assembly in the width direction and extends along the length direction of the chassis assembly;

[0029] The second slide rail is disposed on the other side of the chassis assembly in the width direction and extends along the length direction of the chassis assembly;

[0030] A slide is disposed on one side of the rack, and a gear is rotatably mounted on the slide, the gear meshing with the rack;

[0031] The second slider slides in conjunction with the second slide rail.

[0032] A heating element is horizontally disposed between the rack and the second slide rail, with one end connected to the slide block and the other end connected to the second slider;

[0033] The second drive source has its drive end connected to the gear transmission for driving the gear to rotate. The gear moves along the length direction of the rack by meshing with the rack, thereby driving the heating element to move along the length direction of the chassis assembly.

[0034] Beneficial effects: Firstly, it offers high stability and excellent displacement accuracy of the heating element. The dual-guide support structure, consisting of a gear and rack pair and a second slide rail and slider pair, connects the heating element at one end to the slide base and at the other end to the second slider. This ensures that both ends of the heating element are synchronously constrained during translation, effectively preventing swaying, twisting, or jamming caused by single-end cantilever drive. It guarantees that the displacement trajectory of the heating element along the length of the base is an ideal straight line, thus significantly improving the positioning accuracy of the heating element in the frosting area.

[0035] Secondly, by providing auxiliary support to the heating element through the second slide rail, the weight of the heating element and the vibration load that may be generated during operation are shared by the rack and the second slide rail, reducing the unilateral force burden on the gear rack pair and extending the service life of the rack.

[0036] Thirdly, the rack and the second slide rail are respectively set on both sides of the width direction of the base, and the heating element is horizontally set between the two. The second drive source is connected to the gear transmission. The overall layout makes full use of the space on both sides of the width of the base, and the middle area provides unobstructed passage space for the heating element to move horizontally, which is convenient for the installation, debugging and maintenance of the heating element.

[0037] Furthermore, both the slide block and the second slider are provided with a second fixing clip, which is used to clamp and fix the corresponding ends of the heating element.

[0038] Beneficial effects: The second fixing clamp provides circumferential restraint to the end of the heating element. Combined with the clamping force generated by the fasteners, it ensures no relative displacement between the end of the heating element and the slide block and the second slider in both the horizontal and vertical directions. This allows the heating element to reliably move synchronously with the gear and rack pair. Furthermore, the second fixing clamp adopts a split, detachable structure. When the heating element needs replacement or maintenance, simply loosening the fasteners allows the second fixing clamp to be detached from the slide block and the second slider, enabling the removal of the heating element without disassembling the gear and rack pair and the second slide block pair, significantly improving the ease of assembly and disassembly of the heating element. In addition, the sleeve-type design of the second fixing clamp ensures that the clamping force is evenly distributed along the circumference of the heating element, avoiding surface damage or deformation caused by excessive force at localized points of contact, thus protecting the structural integrity of the heating element.

[0039] Furthermore, a groove is provided at the bottom of the rack and on the side facing the slide, the groove extending along the length of the rack;

[0040] The slide block is provided with a third slider corresponding to the slide groove, and the third slider slides in cooperation with the slide groove.

[0041] Beneficial effects: When the gear rolls on the rack, the radial force generated by the meshing of the gear teeth and the weight of the gear itself may cause the gear to wobble or jump away from the rack direction. The guide fit structure formed by the groove and the third slider can effectively absorb the radial force and guide the gear to move strictly in a straight line along the length of the rack. This ensures that the gear and rack always maintain the correct meshing position and meshing clearance, and avoids transmission failure due to gear disengagement or poor meshing.

[0042] Meanwhile, the guiding fit structure bears all radial loads perpendicular to the direction of motion during gear movement, allowing the rack tooth surface to bear only tangential meshing force. This significantly improves the stress state of the rack, helps reduce tooth surface wear, extends the service life of the gear rack pair, and ensures the linearity and positional repeatability of the heating element during translation. Furthermore, the guiding fit structure also provides dust protection and guiding lubrication, further enhancing the stability and reliability of the gear rack pair during long-term operation.

[0043] Furthermore, the rack and / or the second slide rail and / or the slide groove are provided with first limiting members at both ends along their own length direction.

[0044] Beneficial effect: The first limiting component physically limits the translational stroke of the gear along the length direction of the base, thereby physically limiting the translational stroke of the second slide rail slider pair along the length direction of the base, preventing the moving parts from exceeding the designed stroke range.

[0045] Furthermore, the chassis assembly is provided with a base and a water receiving tray in a vertical direction from top to bottom, and a drain outlet is provided at the lowest point of the water receiving tray;

[0046] Both the base and the water receiving tray are divided into multiple frosting areas along their length; all frosting areas of the base and the water receiving tray, as well as the drain outlet, are equipped with frosting sensors.

[0047] Beneficial effects: By monitoring the frost thickness of each frost area in real time through frost sensors, the maximum frost area or the frost blockage of the drain outlet can be identified. Only when the frost thickness of a certain frost area exceeds the preset value T0 will the drive structure be controlled to move the heating element to the frost area for fixed-point heating, realizing on-demand fixed-point defrosting, thoroughly removing the frost layer with the lowest energy consumption, preventing frost blockage of the drain outlet, and avoiding ineffective heating of frost-free areas.

[0048] The present invention also proposes a cold air blower, including a heat exchanger, wherein a movable defrosting device as described above is correspondingly provided at the bottom of the heat exchanger.

[0049] Beneficial effects: By monitoring the frost distribution in the frost area in real time through the frost sensor, the drive structure drives the heating element to move to the frost area on the chassis assembly, thereby achieving precise defrosting, avoiding ineffective heating of frost-free areas, resulting in lower energy consumption, and ensuring a uniform distribution of the defrosting heat field, avoiding the phenomenon of over-defrosting in some areas and residual frost in others.

[0050] Compared to the traditional fixed electric heating tube layout, this invention eliminates the need for multiple electric heating tubes and their associated electrical components, mounting brackets, and junction boxes, thereby reducing manufacturing costs and the workload of replacement and maintenance.

[0051] The present invention also proposes a defrosting method for the portable defrosting device as described above, comprising:

[0052] Acquire the detection data from each frosting sensor and compare them to obtain the maximum value P in the current detection data. max and the maximum value P max The corresponding maximum frost thickness T max and the maximum value Pmax The corresponding frosting region Si (i≥2);

[0053] Compare the maximum value P max Detection data P from the frost sensor corresponding to the drain outlet 排水口 ;

[0054] If P max >P 排水口 And T max If the value is greater than or equal to the preset value T0, the driving structure drives the heating element to move to the frosting area Si to defrost.

[0055] If P max ≤P 排水口 and / or T max <Preset value T0, the driving structure drives the heating element to move to the drain outlet to defrost.

[0056] Beneficial effects: By monitoring the frost distribution (equivalent to the frost thickness in each frost area) in real time through frost sensors, the frost blockage of each frost area or drain outlet can be identified. Only when the frost thickness of a certain frost area or drain outlet is detected to be greater than or equal to the preset value T0 will the drive structure be controlled to move the heating element to the corresponding frost area for fixed-point heating. Priority should be given to ensuring that the drain outlet is unobstructed. This achieves on-demand fixed-point defrosting, completely removing the frost layer with the lowest energy consumption and avoiding ineffective heating of frost-free areas. It is a "dynamic and intelligent" dynamic tracking strategy that solves the defrosting blind spots and corner problems of traditional fixed electric heating tube layout schemes.

[0057] Further, defrosting is performed according to the drain outlet, the defrosting method including:

[0058] Obtain the P 排水口 Corresponding frost thickness T 排水口 ;

[0059] Determine the T 排水口 Is it greater than the preset value T0?

[0060] If the T 排水口 If the value is greater than or equal to the preset value T0, defrosting will still be performed on the drain outlet;

[0061] If the T 排水口<Preset value T0, the drain outlet completes defrosting, and the driving structure drives the heating element to move to other frosting areas Si to be defrosted.

[0062] Beneficial effect: When the driving structure moves the heating element to the drain outlet for targeted heating, the frost layer thickness at the drain outlet will continuously decrease until T 排水口 <Preset value T0 indicates that there is no frost layer at the drain outlet or the residual frost layer is insufficient to affect the smooth flow of the drain outlet, and the drain outlet has been defrosted. At this time, the controller controls the drive structure to drive the heating element to move to other frosted areas Si to be defrosted or return to the initial position, so as to avoid ineffective heating of the frost-free area and lower energy consumption.

[0063] Further, defrosting is performed according to the above, the defrosting method comprising:

[0064] The real-time frost thickness values ​​of all the frost sensors are periodically read at preset time intervals;

[0065] The maximum value among all real-time frost thickness values ​​within the current period is determined and denoted as the current maximum frost thickness T. max ;

[0066] When any non-current maximum frost thickness T is detected max Real-time frost thickness T corresponding to the frosting area y Greater than the current maximum frost thickness T max Determine the real-time frost layer thickness T y The corresponding frosting area became clogged with frost;

[0067] The heating element is de-energized, and the driving structure drives the heating element to move to the real-time frost layer thickness T. y After the corresponding frosting area is cleared, the heating element is powered on again;

[0068] Repeat the above periodic data collection and judgment steps until the real-time frost thickness of all the frosted areas meets the preset defrosting termination condition.

[0069] Beneficial effect: When any non-current maximum frost thickness T is detected max Real-time frost thickness T corresponding to the frosting area y Greater than the current maximum frost thickness T max Determine the real-time frost thickness T y The corresponding frosting area is greater than the current maximum frosting thickness T. max The defrosting requirement is more urgent in the corresponding frosted area, so the controller will first disconnect the power to the heating element to prevent ineffective heating during movement. Then, the controller will control the drive structure to move the heating element to the real-time frost thickness T. yAfter the corresponding frosting area is cleared, the controller re-energizes the heating element to heat it. This is an "intelligent optimization" defrosting solution. The heating element acts like a "searchlight," always focusing on the most severely frosted area to prevent secondary freezing and blockage.

[0070] Furthermore, the defrosting method includes:

[0071] During each execution of the aforementioned judgment step, the T is compared synchronously. 排水口 and the preset value T0;

[0072] If the T 排水口 If the value is greater than or equal to the preset value T0, then the drain outlet will be defrosted first.

[0073] If the T 排水口 <Preset value T0, then the real-time frost layer thickness T y Defrost the corresponding frosted areas.

[0074] Beneficial effect: When judging the real-time frost layer thickness T each time y Is it greater than the current maximum frost thickness T? max At the same time, it is necessary to simultaneously judge the thickness of the frost layer at the drain outlet to ensure that the drain outlet is unobstructed and can drain smoothly. This will prevent defrost water from overflowing from the drip tray and dripping directly onto the electrical components (such as motors and junction boxes) or the ground below, which could easily cause short circuits, leakage, or make the ground slippery and other safety accidents.

[0075] Furthermore, the defrosting method includes:

[0076] Determine whether the current defrosting process meets the preset defrosting termination condition, which includes the frost thickness T of all the frosted areas. i Whether all values ​​are less than the preset value T0 or whether the cumulative heating time of the heating element reaches the maximum allowable value;

[0077] If the preset defrosting termination condition is met, the chassis assembly will end the defrosting process.

[0078] If the preset defrosting termination condition is not met, the chassis assembly will continue defrosting.

[0079] Beneficial effects: By setting the defrost termination conditions, the defrosting process can be carried out only when frost is present, achieving defrosting on demand, avoiding ineffective heating during frost-free periods, reducing energy waste, and improving the overall energy efficiency of the unit; at the same time, it avoids the loss of cold air caused by excessive defrosting.

[0080] Compared with the prior art, the present invention has at least the following beneficial effects:

[0081] 1. This invention uses a frosting sensor to monitor the frost distribution in the frosting area in real time, and then drives the heating element to move to the severely frosted area, thereby achieving precise defrosting, avoiding ineffective heating of frost-free areas, resulting in lower energy consumption, and ensuring a uniform distribution of the defrosting heat field, avoiding the phenomenon of over-defrosting in some areas and residual frost in others.

[0082] 2. Compared with the traditional fixed electric heating tube layout, the present invention does not require multiple electric heating tubes and their supporting electrical components, mounting brackets and junction boxes, thereby reducing manufacturing costs and the workload of replacement and maintenance. Attached Figure Description

[0083] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0084] Figure 1 This is a partially exploded diagram of the air cooler proposed in the background technology;

[0085] Figure 2 This is a partial cross-sectional view of the movable defrosting device proposed in this invention;

[0086] Figure 3 This is a schematic diagram of the first structure of a driving structure proposed in this invention;

[0087] Figure 4 for Figure 3 An enlarged schematic diagram of reference numeral A in the attached figure;

[0088] Figure 5 for Figure 3 An enlarged view of reference numeral B in the attached diagram;

[0089] Figure 6 for Figure 3 Enlarged schematic diagram of reference numeral C in the attached figure;

[0090] Figure 7 This is a schematic diagram of the second structure of the driving structure proposed in this invention;

[0091] Figure 8 for Figure 7 An enlarged schematic diagram of reference numeral D in the attached figure;

[0092] Figure 9 This is a schematic diagram of the first structure of another driving structure proposed in this invention;

[0093] Figure 10 for Figure 9 An enlarged schematic diagram of reference numeral E in the attached figure;

[0094] Figure 11 This is a schematic diagram of a second structure of another driving structure proposed in this invention;

[0095] Figure 12 for Figure 11 An enlarged schematic diagram of reference numeral F in the attached figure;

[0096] Figure 13 for Figure 11 An enlarged schematic diagram of reference numeral G in the attached figure;

[0097] Figure 14 This is a flowchart of the defrosting method proposed in this invention.

[0098] Figure label:

[0099] 10. Chassis components;

[0100] 101. Base; 102. Water receiving tray; 103. Drain outlet;

[0101] 20. Heat exchanger;

[0102] 30. Drive structure;

[0103] 301. Lead screw; 302. First slide rail; 303. Threaded mating part; 304. First slider; 305. First drive source; 306. Bearing housing; 307. First fixing clamp; 308. Rack; 309. Second slide rail; 310. Slide block; 311. Gear; 312. Second slider; 313. Second drive source; 314. Second fixing clamp; 315. Slide groove; 316. Third slider;

[0104] 40. Heating element;

[0105] 50. Frost sensor;

[0106] 100. Chassis;

[0107] 200. Electric heating element. Detailed Implementation

[0108] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0109] In low-temperature cold storage, evaporators are the core heat exchange equipment. During long-term operation, the surface of their evaporators gradually frosts due to the condensation of water vapor in the air. When the frost layer is too thick, it significantly reduces heat exchange efficiency, increases fan energy consumption, and can even cause serious malfunctions such as liquid carryover in the refrigeration system and compressor damage. Therefore, evaporators need to be defrosted regularly. Currently, hot refrigerant defrosting technology has become the preferred defrosting method for large cold storage facilities in the industry due to its advantages such as requiring no additional electricity for heating and high defrosting efficiency. This technology uses a four-way reversing valve to directly introduce the high-temperature, high-pressure gaseous refrigerant discharged from the compressor into the evaporator coil. The sensible and latent heat carried by the refrigerant itself quickly melts the frost layer on the outer surface of the coil, thus achieving efficient defrosting without shutting down the system and without requiring additional electricity.

[0110] At the same time, to prevent the defrost water from freezing again at the drain outlets of the chassis and drip tray, such as Figure 1 As shown, multiple fixed electric heating elements 200 are typically installed below the chassis 100, often requiring four or more elements. This is to ensure that all heating elements 200 are simultaneously energized and heated during or slightly before the defrosting cycle begins. The aim is to maintain the metal wall temperature of the chassis 100 above freezing point through radiation and convection heat transfer, thus preventing frost buildup in the entire chassis 100 area. However, this traditional fixed electric heating element layout has the following drawbacks:

[0111] First, the multiple electric heating elements 200 and their associated electrical components, mounting brackets, and junction boxes significantly increase the equipment manufacturing cost. Furthermore, regardless of whether there is a genuine risk of frost buildup in any part of the chassis 100, all electric heating elements 200 must operate at full power during every defrosting cycle, resulting in severe "ineffective energy consumption" and wasted electricity. Second, in actual operation, frost accumulation on the chassis 100 exhibits significant regional selectivity (for example, thicker frost layers are found at the bottom of the evaporator's windward side, near the drain outlet, and in airflow dead zones), easily leading to over-defrosting in some areas and residual frost in others, resulting in a severely uneven distribution of the defrosting heat field. Finally, the large number of electric heating elements 200, complex wiring, numerous potential failure points, and a significant workload for replacement and maintenance.

[0112] Therefore, in some embodiments, such as Figure 2 As shown, this invention proposes a low-cost, low-energy-consumption, and uniformly distributed defrosting heat field portable defrosting device, comprising:

[0113] The chassis assembly 10 is disposed at the bottom of the heat exchanger 20; the chassis assembly 10 is divided into multiple frosting areas;

[0114] A drive structure 30 is mounted on the chassis assembly 10, and a heating element 40 is connected to the drive end of the drive structure 30.

[0115] Frost sensors 50 are respectively disposed in all the frost areas; the frost sensors 50 are used to detect the frost thickness;

[0116] The drive structure 30 can drive the heating element 40 to move to different frosting areas.

[0117] It should be noted that the portable defrosting device proposed in this embodiment also includes a controller. The heat exchanger 20 proposed in this embodiment is preferably an evaporator.

[0118] Thus, when it is necessary to prevent defrosting water from freezing again on the chassis assembly 10, the controller uses the frost sensor 50 to detect the frost thickness in different frost areas of the chassis assembly 10. When the frost thickness in a frost area exceeds the preset value T0, the controller activates the drive structure 30 to drive the heating element 40 to move to the frost area where the frost thickness exceeds the preset value T0. Then the controller activates the heating element 40 again to maintain the temperature of the frost area above the freezing point through radiation and convection heat transfer, so as to ensure that the frost area is defrosted.

[0119] Therefore, the present invention monitors the frost distribution in the frost area in real time by using the frost sensor 50, and then drives the heating element 40 to move to the frost area with severe frost by the driving structure 30, thereby achieving precise defrosting, avoiding ineffective heating of the frost-free area, resulting in lower energy consumption, and ensuring a uniform distribution of the defrosting heat field, avoiding the phenomenon of excessive defrosting in some areas and residual frost in others.

[0120] Compared to the traditional fixed electric heating tube layout, this invention eliminates the need for multiple electric heating tubes and their associated electrical components, mounting brackets, and junction boxes, thereby reducing manufacturing costs and the workload of replacement and maintenance.

[0121] In some embodiments, such as Figure 2 As shown, the chassis assembly 10 is provided with a base 101 and a water receiving tray 102 in a vertical direction from top to bottom, and a drain outlet 103 is provided at the lowest point of the water receiving tray 102.

[0122] Both the base 101 and the water receiving tray 102 are divided into multiple frosting areas along their own length direction; all frosting areas of the base 101 and the water receiving tray 102, as well as the drain outlet 103, are equipped with frosting sensors 50.

[0123] It should be noted that the frosting sensor 50 proposed in this embodiment is illustrated by a capacitive frosting sensor; of course, the frosting sensor 50 can also be an optical frosting sensor or an ultrasonic frosting sensor, which is not limited here. Furthermore, the larger the capacitance value detected by the capacitive frosting sensor, the greater the frost thickness.

[0124] Furthermore, the base 101 is hollowed out, and the top surface of the base 101 can completely cover the entire bottom projection area of ​​the heat exchanger 20; the base 101 is located inside the water receiving tray 102 so that all liquid water sliding off the fins and heat exchange tubes of the heat exchanger 20 can be collected by the water receiving tray 102, achieving a full-range water receiving effect without dead angles.

[0125] Both the base 101 and the water tray 102 have six frosting zones (S1-S6) arranged sequentially along their length. Each frosting zone in the base 101 and the water tray 102 is equipped with a frosting sensor 50. When the heat exchanger 20 defrosts, the melted defrosting water falls down along the fins of the heat exchanger 20. Some of the defrosting water passes through the hollow structure of the base 101 and falls directly into the water tray 102. A small amount of defrosting water remains on the base 101 and the water tray 102, which may lead to a risk of secondary freezing. Therefore, frosting sensors 50 need to be installed in both the base 101 and the water tray 102 for monitoring, so that each frosting zone is detected by two frosting sensors 50. A frosting sensor 50 is also installed at the drain outlet 103 to detect whether there is frost or ice blockage at the drain outlet 103.

[0126] Therefore, this embodiment can monitor the frost thickness of each frost area in real time through the frost sensor 50, identify the frost blockage of the largest frost area or the drain outlet 103, and only when the frost thickness of a certain frost area is detected to exceed the preset value T0 will the drive structure 30 be controlled to drive the heating element 40 to move to the frost area for fixed-point heating, so as to realize on-demand fixed-point defrosting, remove the frost layer with the lowest energy consumption, prevent the drain outlet 103 from being blocked by frost, and avoid ineffective heating of the frost-free area.

[0127] In some embodiments, such as Figures 3 to 8 As shown, this embodiment proposes a drive structure 30, which is a lead screw drive structure, comprising:

[0128] The lead screw 301 is disposed on one side of the chassis assembly 10 in the width direction and extends along the length direction of the chassis assembly 10;

[0129] The first slide rail 302 is disposed on the other side of the width direction of the chassis assembly 10 and extends along the length direction of the chassis assembly 10;

[0130] The threaded fitting 303 is threadedly engaged with the lead screw 301;

[0131] The first slider 304 is slidably engaged with the first slide rail 302;

[0132] A heating element 40 is horizontally disposed between the lead screw 301 and the first slide rail 302, with one end connected to the threaded fitting 303 and the other end connected to the first slider 304;

[0133] The first drive source 305 has its drive end connected to the lead screw 301 for driving the lead screw 301 to rotate, thereby causing the threaded mating part 303 to move along the lead screw 301, and in turn causing the heating element 40 to move along the length direction of the chassis assembly 10.

[0134] It should be noted that the threaded mating part 303 proposed in this embodiment is preferably a nut; the first driving source 305 is preferably a servo motor or a hydraulic motor.

[0135] Furthermore, the width direction of the chassis assembly 10 proposed in this embodiment is preferably the X-axis direction, which is equivalent to the width direction of the base 101 or the water receiving tray 102; the length direction of the chassis assembly 10 is preferably the Y-axis direction, which is equivalent to the length direction of the base 101 or the water receiving tray 102.

[0136] The lead screw 301 and the first slide rail 302 are respectively mounted on the base 101 and arranged on both sides of the width direction of the base 101; and the first drive source 305 is also fixedly mounted on the corresponding position of the base 101.

[0137] Thus, when the heating element 40 needs to be moved to the designated frosting area, the controller activates the first drive source 305, which drives the lead screw 301 to rotate, causing the threaded engagement part 303 to move along the lead screw 301. The first slider 304 follows the first slide rail 302, thereby enabling the heating element 40 to move along the length of the base 101, and achieving the following effect:

[0138] Firstly, it exhibits high stability and excellent displacement accuracy of the heating element 40. A double-guided support structure, consisting of a lead screw and nut pair and a first slide rail and slider pair, is employed. One end of the heating element 40 is connected to the threaded fitting 303, and the other end is connected to the first slider 304. This ensures that both ends of the heating element 40 are always synchronously constrained during translation, effectively preventing swaying, twisting, or jamming caused by single-end cantilever drive. This guarantees that the displacement trajectory of the heating element 40 along the length of the base 101 is an ideal straight line, thereby significantly improving the positioning accuracy of the heating element 40 in the frosting area.

[0139] Secondly, the first slide rail 302 provides auxiliary support to the heating element 40, so that the weight of the heating element 40 and the vibration load that may be generated during operation are jointly borne by the lead screw 301 and the first slide rail 302, reducing the unilateral force burden of the lead screw and nut pair and extending the service life of the lead screw 301.

[0140] Thirdly, the lead screw 301 and the first slide rail 302 are respectively set on both sides of the width direction of the base 101, and the heating element 40 is horizontally set between the two. The first drive source 305 is connected to the lead screw 301 for transmission. The overall layout makes full use of the space on both sides of the width of the base 101, and the middle area provides unobstructed passage space for the heating element 40 to move, which facilitates the installation, debugging and maintenance of the heating element 40.

[0141] In other embodiments (not shown in the figure), second limiting members can be provided at both ends of the first slide rail 302 along its length to physically limit the translational stroke of the first slider 304 along the length of the base 101, thereby physically limiting the translational stroke of the lead screw nut pair along the length of the base 101 and preventing the moving parts from exceeding the designed stroke range.

[0142] In some embodiments, such as Figure 6 As shown, the end of the lead screw 301 away from the first drive source 305 is rotatably connected to a bearing seat 306, and the bearing seat 306 is mounted on the chassis assembly 10.

[0143] Therefore, the main function of the bearing housing 306 is to provide radial and axial rotational support for the end of the lead screw 301 away from the first drive source 305 (i.e., the free end). This ensures that both ends of the lead screw 301 are stably supported when it is driven to rotate by the first drive source 305, effectively suppressing radial runout and axial movement that may occur when the lead screw 301 is long and rotates at high speeds, thus ensuring smooth operation of the lead screw 301. Simultaneously, the bearing housing 306 and the output end of the first drive source 305 are located at opposite ends of the lead screw 301. Together, they form a stable simply supported structure. Compared to a cantilever layout that relies solely on the output end of the first drive source 305 for support, this significantly enhances the bending rigidity of the lead screw 301, preventing positional shifts or movement jamming of the heating element 40 due to bending deformation of the lead screw 301 during translation. This ensures the straightness and repeatability of the heating element 40's translation along the length of the base 101, extending the overall service life of the lead screw 301 and the drive structure 30.

[0144] In some embodiments, such as Figures 4 to 5 As shown, both the threaded fitting 303 and the first slider 304 are provided with a first fixing clip 307, which is used to clamp and fix the corresponding two ends of the heating element 40.

[0145] It should be noted that the inner contour of the first fixing clip 307 is adapted to the outer shape of the heating element 40, and it covers the outer periphery of the end of the heating element 40 in a sleeve manner. The two ends of the first fixing clip 307 are respectively locked and fixed to the bottom of the corresponding threaded mating part 303 and the first slider 304 by fasteners (such as bolts).

[0146] In this way, the first fixing clamp 307 achieves circumferential limiting of the end of the heating element 40. Combined with the clamping force generated by the fastener locking, it ensures that there is no relative displacement between the end of the heating element 40 and the threaded mating part 303 and the first slider 304 in the horizontal and vertical directions. This allows the heating element 40 to reliably move synchronously with the screw and nut pair. Moreover, the first fixing clamp 307 adopts a split and detachable structure. When the heating element 40 needs to be replaced or maintained, it is only necessary to loosen the fastener to detach the first fixing clamp 307 from the threaded mating part 303 and the first slider 304, and then remove the heating element 40. There is no need to disassemble the screw and nut pair and the first slide rail slider pair, which significantly improves the convenience of disassembling and assembling the heating element 40. In addition, the sleeve design of the first fixing clamp 307 can make the clamping force evenly distributed along the circumference of the heating element 40, avoiding damage or deformation of the surface of the heating element 40 due to excessive force at local point contact, which helps to protect the structural integrity of the heating element 40.

[0147] In other embodiments, such as Figures 9 to 13 As shown, this embodiment proposes another composition of the drive structure 30, which is a gear and rack transmission structure, comprising:

[0148] A rack 308 is disposed on one side of the chassis assembly 10 in the width direction and extends along the length direction of the chassis assembly 10;

[0149] The second slide rail 309 is disposed on the other side of the width direction of the chassis assembly 10 and extends along the length direction of the chassis assembly 10;

[0150] A slide 310 is disposed on one side of the rack 308, and a gear 311 is rotatably mounted on the slide 310, the gear 311 meshing with the rack 308;

[0151] The second slider 312 is in sliding engagement with the second slide rail 309;

[0152] A heating element 40 is horizontally disposed between the rack 308 and the second slide rail 309, with one end connected to the slide block 310 and the other end connected to the second slider 312;

[0153] The second drive source 313 has its drive end connected to the gear 311 for driving the gear 311 to rotate. The gear 311 moves along the length direction of the rack 308 by meshing with the rack 308, thereby driving the heating element 40 to move along the length direction of the chassis assembly 10.

[0154] It should be noted that the second drive source 313 proposed in this embodiment is preferably a servo motor or a hydraulic motor.

[0155] The rack 308 and the second slide rail 309 are respectively disposed on the base 101 and arranged on both sides of the width direction of the base 101; and the second drive source 313 is also fixedly installed on the corresponding position of the base 101.

[0156] Thus, when the heating element 40 needs to be moved to the designated frosting area, the controller activates the second drive source 313. The second drive source 313 drives the gear 311 to rotate, so that the gear 311 and the second drive source 313 mounted on the gear 311 move together along the length direction of the rack 308 through meshing with the rack 308. The second slider 312 follows the second slide rail 309, so that the heating element 40 moves along the length direction of the base 101, and has the following effect:

[0157] Firstly, it exhibits high motion stability and excellent displacement accuracy of the heating element 40. A double-guided support structure, consisting of a gear and rack pair and a second slide rail and slider pair, is employed. One end of the heating element 40 is connected to the slide block 310, and the other end is connected to the second slider 312. This ensures that both ends of the heating element 40 are always synchronously constrained during translation, effectively preventing swaying, twisting, or jamming caused by single-end cantilever drive. This guarantees that the displacement trajectory of the heating element 40 along the length of the base 101 is an ideal straight line, thereby significantly improving the positioning accuracy of the heating element 40 in the frosting area.

[0158] Secondly, the second slide rail 309 provides auxiliary support for the heating element 40, so that the weight of the heating element 40 and the vibration load that may be generated during operation are jointly borne by the rack 308 and the second slide rail 309, reducing the unilateral force burden of the gear rack pair and extending the service life of the rack 308.

[0159] Thirdly, the rack 308 and the second slide rail 309 are respectively set on both sides of the width direction of the base 101, and the heating element 40 is horizontally set between the two. The second drive source 313 is connected to the gear 311 for transmission. The overall layout makes full use of the space on both sides of the width of the base 101. The middle area provides unobstructed passage space for the heating element 40 to move, which is convenient for the installation, debugging and maintenance of the heating element 40.

[0160] In some embodiments, such as Figures 12 to 13 As shown, both the slide block 310 and the second slider 312 are provided with a second fixing clip 314, which is used to clamp and fix the corresponding two ends of the heating element 40.

[0161] It should be noted that the inner contour of the second fixing clip 314 is adapted to the outer shape of the heating element 40, and it covers the outer periphery of the end of the heating element 40 in a sleeve manner. The two ends of the second fixing clip 314 are respectively locked and fixed to the bottom of the corresponding slide block 310 and the second slider 312 by fasteners (such as bolts).

[0162] In this way, the second fixing clamp 314 achieves circumferential limiting of the end of the heating element 40. Combined with the clamping force generated by the fastener locking, it ensures that there is no relative displacement between the end of the heating element 40 and the slide block 310 and the second slider 312 in the horizontal and vertical directions. This allows the heating element 40 to reliably move synchronously with the gear rack pair. Moreover, the second fixing clamp 314 adopts a split and detachable structure. When the heating element 40 needs to be replaced or maintained, it is only necessary to loosen the fastener to detach the second fixing clamp 314 from the slide block 310 and the second slider 312, and then remove the heating element 40. There is no need to disassemble the gear rack pair and the second slide rail slider pair, which significantly improves the convenience of disassembling and assembling the heating element 40. In addition, the sleeve design of the second fixing clamp 314 can make the clamping force evenly distributed along the circumference of the heating element 40, avoiding damage or deformation of the surface of the heating element 40 due to excessive force at local point contact, which helps to protect the structural integrity of the heating element 40.

[0163] In some embodiments, such as Figure 12 As shown, the bottom of the rack 308 and the side facing the slide block 310 are provided with a groove 315, which extends along the length direction of the rack 308.

[0164] The slide block 310 is provided with a third slider 316 corresponding to the slide groove 315, and the third slider 316 slides in cooperation with the slide groove 315.

[0165] Thus, when gear 311 rolls on rack 308, the radial force generated by tooth meshing and the weight of gear 311 may cause gear 311 to deviate from the direction of rack 308 or tend to wobble or jump. The guide fit structure formed by slide groove 315 and third slider 316 can effectively absorb the radial force and guide gear 311 to move strictly in a straight line along the length direction of rack 308, ensuring that gear 311 and rack 308 always maintain the correct meshing position and meshing clearance, and avoiding transmission failure due to gear 311 disengaging or poor meshing.

[0166] Meanwhile, the guiding structure bears all radial loads perpendicular to the direction of motion during the movement of gear 311, so that the tooth surface of rack 308 only needs to bear tangential meshing force. This greatly improves the stress state of rack 308, helps to reduce tooth surface wear, extends the service life of the gear and rack pair, and ensures the linearity and positional repeatability of the heating element 40 during translation. In addition, the guiding structure also has the effects of dust prevention and guiding lubrication, which can further improve the stability and reliability of the gear and rack pair under long-term operation.

[0167] In some embodiments (not shown in the figures), the rack 308 and / or the second slide rail 309 and / or the slide groove 315 are provided with first limiting members at both ends along their own length direction.

[0168] It should be noted that this embodiment is illustrated by the example of having a first limiting member at both ends of the rack 308 along its own length direction.

[0169] In this way, the first limiting member physically limits the translational stroke of the gear 311 along the length direction of the base 101, thereby physically limiting the translational stroke of the second slide rail slider pair along the length direction of the base 101 and preventing the moving parts from exceeding the designed stroke range.

[0170] Of course, in other embodiments, the drive structure 30 may also be a cam push rod pair or a worm gear pair, which is not limited here.

[0171] Among them, the guide grooves of the first slide rail 302 and the second slide rail 309 that guide the corresponding slider to slide are preferably dovetail guide grooves; of course, the slide groove 315 is preferably a dovetail groove.

[0172] In some embodiments, such as Figure 2 As shown, the present invention also proposes a cold air blower, including a heat exchanger 20, wherein a movable defrosting device as described above is correspondingly provided at the bottom of the heat exchanger 20.

[0173] The air cooler also includes an evaporator fan 60. The evaporator fan 60 and the heat exchanger 20 are arranged side by side along the length of the base 101. The top surface of the hollowed-out base 101 can completely cover the bottom projection area of ​​the heat exchanger 20 and the bottom projection area of ​​the evaporator fan 60. The base 101 is located in the water receiving tray 102 or the water receiving tray 102 can completely cover the entire projection area of ​​the base 101.

[0174] In this way, the present invention monitors the frost distribution in the frost area in real time through the frost sensor 50, and then drives the heating element 40 to move to the frost area on the chassis assembly 10 through the drive structure 30, thereby achieving precise defrosting, avoiding ineffective heating of the frost-free area, resulting in lower energy consumption, and ensuring a uniform distribution of the defrosting heat field, avoiding the phenomenon of over-defrosting in some areas and residual frost in others.

[0175] Compared to the traditional fixed electric heating tube layout, this invention eliminates the need for multiple electric heating tubes and their associated electrical components, mounting brackets, and junction boxes, thereby reducing manufacturing costs and the workload of replacement and maintenance.

[0176] The frost sensor 50 monitors the frost thickness of each frost area in real time, identifies the area with the largest frost or the frost blockage of the drain outlet 103. Only when the frost thickness of a certain frost area exceeds the preset value T0 will the drive structure 30 be controlled to drive the heating element 40 to move to the frost area for fixed-point heating, so as to realize on-demand fixed-point defrosting, thoroughly remove the frost layer with the lowest energy consumption, prevent frost blockage of the drain outlet 103, and avoid ineffective heating of the frost-free area.

[0177] In some embodiments, such as Figure 14 As shown, the present invention also proposes a defrosting method for the portable defrosting device as described above, comprising:

[0178] Acquire the detection data from each frosting sensor 50, and compare them to obtain the maximum value P in the current detection data. max and the maximum value P max The corresponding maximum frost thickness T max and the maximum value Pmax The corresponding frosting region Si (i≥2);

[0179] Compare the maximum value P max The detection data P of the frosting sensor 50 corresponding to the drain outlet 103 排水口 ;

[0180] If P max >P 排水口 And T max If the preset value T0 is ≥, the driving structure 30 drives the heating element 40 to move to the frosting area Si to defrost;

[0181] If P max ≤P 排水口 and / or T max <Preset value T0, the driving structure 30 drives the heating element 40 to move to the drain outlet 103 to defrost.

[0182] It should be noted that six frosting zones (S1-S6) are sequentially arranged along their length in both the base 101 and the water receiving tray 102, i.e., i=1, 2, 3, 4, 5, 6. The heat exchanger 20 proposed in this embodiment is preferably an evaporator.

[0183] Thus, when the evaporative cooler or heat exchanger 20 reaches the preset defrosting cycle (e.g., once every 6 hours) or the fin temperature of the heat exchanger 20 remains below -10℃ for 20 minutes, the controller receives a defrosting trigger signal. At this time, the evaporative cooler stops running, the solenoid valve of the refrigeration system closes, the heat exchanger 20 enters defrosting mode, and the chassis assembly 10 also enters defrosting mode. Of course, if the heat exchanger 20 does not enter defrosting mode, the chassis assembly 10 can still enter defrosting mode if frost forms on it; this is not a limitation.

[0184] Therefore, this invention uses a frost sensor 50 to monitor the frost distribution (equivalent to the frost thickness of each frost area) in real time, and identifies the frost blockage of each frost area or drain outlet 103. Only when the frost thickness of a certain frost area or drain outlet 103 is detected to be greater than or equal to a preset value T0 will the drive structure 30 be controlled to drive the heating element 40 to move to the corresponding frost area for fixed-point heating. Priority should be given to ensuring that the drain outlet 103 is unobstructed, thereby realizing on-demand fixed-point defrosting, thoroughly removing the frost layer with the lowest energy consumption, and avoiding ineffective heating of frost-free areas. This is a dynamic tracking strategy of "dynamic intelligence", which solves the defrosting blind spots and four-corner problems of traditional fixed electric heating tube layout schemes.

[0185] Defrosting is performed according to the drain outlet 103, and the defrosting method includes:

[0186] Obtain the P 排水口 Corresponding frost thickness T 排水口 ;

[0187] Determine the T 排水口 Is it greater than the preset value T0?

[0188] If the T 排水口 If the value is greater than or equal to the preset value T0, defrosting will still be performed on the drain outlet 103;

[0189] If the T 排水口 <Preset value T0, the drain outlet 103 completes defrosting, and the drive structure 30 drives the heating element 40 to move to other frosting areas Si to be defrosted.

[0190] Thus, when the driving structure 30 drives the heating element 40 to move to the drain outlet 103 for fixed-point heating, the frost layer thickness at the drain outlet 103 will continuously decrease until T 排水口 <Preset value T0 indicates that there is no frost layer on the drain outlet 103 or the residual frost layer is insufficient to affect the smooth flow of the drain outlet 103. The drain outlet 103 has completed defrosting. At this time, the controller controls the drive structure 30 to drive the heating element 40 to move to other frosting areas Si to be defrosted or return to the initial position to avoid ineffective heating of the frost-free area and reduce energy consumption.

[0191] In some embodiments, the defrosting method includes:

[0192] The real-time frost thickness values ​​of all the frost sensors are periodically read at preset time intervals;

[0193] The maximum value among all real-time frost thickness values ​​within the current period is determined and denoted as the current maximum frost thickness T. max ;

[0194] When any non-current maximum frost thickness T is detected max Real-time frost thickness T corresponding to the frosting area y Greater than the current maximum frost thickness T max Determine the real-time frost layer thickness T y The corresponding frosting area became clogged with frost;

[0195] The heating element 40 is de-energized, and the driving structure 30 drives the heating element 40 to move to the real-time frost layer thickness T. y After the corresponding frosting area is cleared, the heating element 40 is re-energized;

[0196] Repeat the above periodic data collection and judgment steps until the real-time frost thickness of all the frosted areas meets the preset defrosting termination condition.

[0197] Thus, when any frost thickness T other than the current maximum is detected... max Real-time frost thickness T corresponding to the frosting area y Greater than the current maximum frost thickness T max Determine the real-time frost thickness T y The corresponding frosting area is greater than the current maximum frosting thickness T. max The defrosting requirement is more urgent in the corresponding frosted area, so the controller will first disconnect the power supply to the heating element 40 to prevent ineffective heating during movement. Then, the controller will control the drive structure 30 to drive the heating element 40 to move to the real-time frost thickness T. y After the corresponding frosting area is cleared, the controller re-energizes the heating element 40 to heat it. This is an "intelligent optimization" defrosting solution. The heating element 40 acts like a "searchlight," always focusing on the most severely frosted area to prevent secondary freezing and blockage.

[0198] In some embodiments, the defrosting method includes:

[0199] During each execution of the aforementioned judgment step, the T is compared synchronously. 排水口 and the preset value T0;

[0200] If the T 排水口 If the value is greater than or equal to the preset value T0, then the drain outlet 103 will be defrosted first.

[0201] If the T 排水口 <Preset value T0, then the real-time frost layer thickness T y Defrost the corresponding frosted areas.

[0202] Thus, each time the real-time frost thickness T is determined... y Is it greater than the current maximum frost thickness T? maxAt the same time, the thickness of the frost layer at the drain outlet 103 must be judged simultaneously to ensure that the drain outlet 103 is unobstructed and can drain smoothly. This will prevent defrost water from overflowing from the water receiving tray 102 and dripping directly onto the electrical components (such as motors and junction boxes) below or onto the ground, which could easily cause short circuits, leakage, or slippery ground and other safety accidents.

[0203] In some embodiments, the defrosting method includes:

[0204] Determine whether the current defrosting process meets the preset defrosting termination condition, which includes the frost thickness T of all the frosted areas. i Whether all values ​​are less than the preset value T0 or whether the cumulative heating time of the heating element 40 reaches the maximum allowable value;

[0205] If the preset defrosting termination condition is met, the chassis assembly 10 will end the defrosting process.

[0206] If the preset defrosting termination condition is not met, the chassis assembly 10 continues defrosting.

[0207] In this way, by setting the defrost termination conditions, the defrost process can be carried out only when frost is present, realizing defrosting on demand, avoiding ineffective heating during frost-free periods, reducing energy waste, and improving the overall energy efficiency of the unit; at the same time, it avoids the loss of cold air caused by excessive defrosting.

[0208] The overall process of the defrosting method proposed in this invention is as follows:

[0209] When the evaporative air cooler or heat exchanger 20 reaches the preset defrosting cycle (e.g., once every 6 hours) or the fin temperature of the heat exchanger 20 remains below -10℃ for 20 minutes, the controller receives a defrosting trigger signal. At this time, the evaporative air cooler stops running, the solenoid valve of the refrigeration system closes, and the system enters defrosting mode.

[0210] Then the controller reads the detection data of each frost sensor 50 (including the capacitance value P and the frost thickness T corresponding to the capacitance value P), and compares them to obtain the maximum value P. max The corresponding region number Si (i=1, 2, 3, 4, 5, 6); simultaneously compare P max P detected by the frost sensor 50 at drain outlet 103 排水口 If P is a data point, then... max >P 排水口 And the frost layer thickness T at drain outlet 103 max If the value is greater than or equal to the preset value T0 (T0 = 1 mm), then the maximum value P is indicated. maxIf the frost thickness in the corresponding frosting area has reached the alarm value, the drive structure 30 drives the heating element 40 to move to the frosting area Si to defrost. If the condition is not met, it indicates that the frost thickness at the drain outlet 103 has hindered drainage. Therefore, according to the principle of prioritizing the unobstructed flow at the drain outlet 103, the drive structure 30 drives the heating element 40 to move to the drain outlet 103 to defrost.

[0211] After the heating element 40 is in place, the controller shuts off its power, and the heating element 40 begins to heat and defrost. During the heating process, the controller rescans all frost sensors 50 at preset intervals (e.g., 30 seconds). If any frost layer thickness T that is not the current maximum is detected, the controller will detect it. max Real-time frost thickness T corresponding to the frosting area y Greater than the current maximum frost thickness T max Then determine the real-time frost thickness T. y The corresponding frosting area experiences more severe frost blockage; at this point, the controller temporarily disconnects the power supply to the heating element 40, and the drive structure 30 drives the heating element 40 to move to the real-time frost thickness T. y After the corresponding frosted area is identified, the controller re-energizes the heating element 40 and repeats the above periodic collection and judgment steps until all frosted areas meet the preset defrosting termination conditions. In addition, the controller must compare the frost thickness at the drain outlet 103 with each judgment to ensure that the water receiving tray 102 drains smoothly.

[0212] When the frost thickness in all frosted areas is T i If the cumulative heating time of the heating element 40 is less than the preset value T0 or reaches the maximum allowable value of 30 minutes (safety protection), the chassis assembly 10 can end defrosting. Then the controller cuts off the power supply to the heating element 40, and then the drive structure 30 drives the heating element 40 to move to the initial position. The cumulative defrosting time and the peak value of each frosting area are recorded for subsequent optimization of defrosting parameters. After that, the air cooler exits the defrosting mode and resumes cooling operation.

[0213] With the above functions such as regional frost detection, automatic positioning, and dynamic adjustment, it achieves a high degree of intelligence and can realize unattended intelligent operation and maintenance, making it suitable for large-scale cold chain material centers, food processing plants, and other scenarios.

[0214] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. 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. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings may be implemented in any order unless a specific express order is specified, and as long as the output of a previous process is not used in a subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0215] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus 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 constraints. 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.

[0216] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable defrosting device, characterized in that, include: A chassis assembly (10) is provided at the bottom of the heat exchanger (20); the chassis assembly (10) is divided into multiple frosting areas; A drive structure (30) is mounted on the chassis assembly (10), and a heating element (40) is connected to the drive end of the drive structure (30). Frost sensors (50) are respectively disposed in all said frosting areas; the frost sensors (50) are used to detect the thickness of frost; The driving structure (30) drives the heating element (40) to move to different frosting areas.

2. The portable defrosting device according to claim 1, characterized in that, The drive structure (30) is a lead screw drive structure, which includes: A lead screw (301) is disposed on one side of the chassis assembly (10) in the width direction and extends along the length direction of the chassis assembly (10); The first slide rail (302) is disposed on the other side of the width direction of the chassis assembly (10) and extends along the length direction of the chassis assembly (10); The threaded fitting (303) is threadedly engaged with the lead screw (301); The first slider (304) is in sliding engagement with the first slide rail (302); A heating element (40) is horizontally disposed between the lead screw (301) and the first slide rail (302), one end of which is connected to the threaded fitting (303) and the other end of which is connected to the first slider (304); The first drive source (305) has its drive end connected to the lead screw (301) for driving the lead screw (301) to rotate, thereby driving the threaded mating part (303) to move along the lead screw (301), and then driving the heating element (40) to move along the length direction of the chassis assembly (10).

3. The portable defrosting device according to claim 2, characterized in that, The end of the lead screw (301) away from the first drive source (305) is rotatably connected to a bearing housing (306), and the bearing housing (306) is mounted on the chassis assembly (10).

4. The portable defrosting device according to claim 3, characterized in that, Both the threaded fitting (303) and the first slider (304) are provided with a first fixing clip (307), which is used to clamp and fix the corresponding two ends of the heating element (40).

5. The portable defrosting device according to claim 1, characterized in that, The drive structure (30) is a gear (311) and rack (308) transmission structure, which includes: A rack (308) is disposed on one side of the chassis assembly (10) in the width direction and extends along the length direction of the chassis assembly (10); The second slide rail (309) is disposed on the other side of the width direction of the chassis assembly (10) and extends along the length direction of the chassis assembly (10); A slide (310) is disposed on one side of the rack (308), and a gear (311) is rotatably mounted on the slide (310), the gear (311) meshing with the rack (308); The second slider (312) is in sliding engagement with the second slide rail (309); A heating element (40) is horizontally disposed between the rack (308) and the second slide rail (309), one end of which is connected to the slide block (310) and the other end of which is connected to the second slider (312); The second drive source (313) is connected to the gear (311) for driving the gear (311) to rotate. The gear (311) moves along the length direction of the rack (308) by meshing with the rack (308), thereby driving the heating element (40) to move along the length direction of the chassis assembly (10).

6. The portable defrosting device according to claim 5, characterized in that, Both the slide block (310) and the second slider (312) are provided with a second fixing clip (314), which is used to clamp and fix the corresponding ends of the heating element (40).

7. The portable defrosting device according to claim 5, characterized in that, The bottom of the rack (308) and the side facing the slide (310) are provided with a groove (315), which extends along the length of the rack (308). The slide block (310) is provided with a third slider (316) corresponding to the slide groove (315), and the third slider (316) slides in cooperation with the slide groove (315).

8. The portable defrosting device according to claim 7, characterized in that, The rack (308) and / or the second slide rail (309) and / or the slide groove (315) are each provided with a first limiting member at both ends along their own length direction.

9. The portable defrosting device according to claim 1, characterized in that, The chassis assembly (10) is provided with a base (101) and a water receiving tray (102) in the vertical direction from top to bottom, and a drain outlet (103) is provided at the lowest point of the water receiving tray (102). Both the base (101) and the water receiving tray (102) are divided into multiple frosting areas along their own length direction; all frosting areas of the base (101) and the water receiving tray (102) as well as the drain outlet (103) are equipped with frosting sensors (50).

10. A cold air blower, comprising a heat exchanger (20), characterized in that, The bottom of the heat exchanger (20) is provided with a movable defrosting device as described in any one of claims 1 to 9.

11. A defrosting method for a portable defrosting device as described in any one of claims 1 to 9, characterized in that, include: Acquire the detection data from each frosting sensor (50), and compare them to obtain the maximum value P in the current detection data. max and the maximum value P max The corresponding maximum frost thickness T max and the maximum value Pmax The corresponding frosting region Si (i≥2); Compare the maximum value P max The detection data P of the frost sensor (50) corresponding to the drain outlet (103) 排水口 ; If P max >P 排水口 And T max ≥Preset value T0, drive structure (30) drives heating element (40) to move to the frosting area Si to defrost; If P max ≤P 排水口 and / or T max <Preset value T0, the driving structure (30) drives the heating element (40) to move to the drain (103) to defrost.

12. The defrosting method according to claim 11, characterized in that, Defrosting is performed according to the drain outlet (103), and the defrosting method includes: Obtain the P 排水口 Corresponding frost thickness T 排水口 ; Determine the T 排水口 Is it greater than the preset value T0? If the T 排水口 If the value is greater than or equal to the preset value T0, the drain outlet (103) will still be defrosted. If the T 排水口 <Preset value T0, the drain outlet (103) completes defrosting, and the drive structure (30) drives the heating element (40) to move to other frosting areas Si to be defrosted.

13. The defrosting method according to claim 11, characterized in that, The defrosting process is performed as described above, and the defrosting method includes: The real-time frost thickness values ​​of all the frost sensors are periodically read at preset time intervals; The maximum value among all real-time frost thickness values ​​within the current period is determined and denoted as the current maximum frost thickness T. max ; When any non-current maximum frost thickness T is detected max Real-time frost thickness T corresponding to the frosting area y Greater than the current maximum frost thickness T max Determine the real-time frost layer thickness T y The corresponding frosting area became clogged with frost; The heating element (40) is de-energized, and the driving structure (30) drives the heating element (40) to move to the real-time frost layer thickness T. y After the corresponding frosting area is cleared, the heating element (40) is re-energized; Repeat the above periodic data collection and judgment steps until the real-time frost thickness of all the frosted areas meets the preset defrosting termination condition.

14. The defrosting method according to claim 13, characterized in that, The defrosting method includes: During each execution of the aforementioned judgment step, T is compared synchronously. 排水口 and the preset value T0; If the T 排水口 If the value is greater than or equal to the preset value T0, then the drain outlet (103) will be defrosted first. If the T 排水口 <Preset value T0, then the real-time frost layer thickness T y Defrost the corresponding frosted areas.

15. The defrosting method according to any one of claims 11 to 14, characterized in that, The defrosting method includes: Determine whether the current defrosting process meets the preset defrosting termination condition, which includes the frost thickness T of all the frosted areas. i Whether all values ​​are less than the preset value T0 or whether the cumulative heating time of the heating element (40) reaches the maximum allowable value; If the preset defrosting termination condition is met, the chassis assembly (10) will end defrosting; If the preset defrosting termination condition is not met, the chassis assembly (10) continues to defrost.

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