Deicing device, axial flow fan and air conditioning system

Abstract

The utility model discloses a deicing device, an axial flow fan and an air-conditioning system, which comprise a support shell, an axial flow fan and an air-conditioning system, wherein the support shell is provided with a through hole along the axial direction; the supporting shell is used for being independently assembled on a fan cover of the axial flow fan. The protective cover covers the supporting shell, and an annular air inlet channel is formed between the supporting shell and the protective cover; a through hole is formed in the supporting shell, the mounting plate is covered with the supporting shell, the mounting plate is provided with an air draft assembly corresponding to the through hole, and an annular air outlet channel is formed between the supporting shell and the mounting plate; the heating assembly is arranged in the supporting shell in the circumferential direction of the end, away from the protective cover, of the supporting shell. The air draft assembly draws external cold air through the air inlet channel, and the cold air is blown to fan blades of the axial flow fan from the air outlet channel after being heated by the heating assembly. Therefore, it is ensured that the whole fan blade is within the wrapping range of hot air, ice layers or accumulated snow on the surface of the fan blade is effectively removed, and the deicing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, and in particular to a de-icing device, an axial flow fan and an air conditioning system. Background Technology

[0002] Axial fans are crucial aerodynamic components in air conditioning systems, widely used in supply, exhaust, and recirculation air systems. Commercial air conditioning units, such as modular units and air-cooled screw chillers, are typically installed outdoors, making their axial fans susceptible to severe weather conditions. In winter, low outdoor temperatures and high humidity during snowfall or rain cause moisture to condense and freeze on the surface of the axial fans, especially when the unit is off, as the surface temperature is even lower, making ice or snow accumulation more likely. Ice or snow on the axial fan surface increases its imbalance, leading to increased vibration and potentially damaging the fan bearings, blades, or the entire unit frame. Furthermore, ice or snow increases the fan load, causing a sharp increase in starting current. If the current exceeds the motor's rated range, it can overload or even burn out the motor. Therefore, before starting the unit, it is essential to check the axial fan surface for ice or snow and clean it thoroughly before operation.

[0003] However, axial flow fans are typically located at the top or outside of the unit, and commercial air conditioning units are large, making ice or snow removal difficult and posing certain safety hazards. Furthermore, currently, the main de-icing methods used in existing technologies to address axial flow fan icing are as follows:

[0004] Firstly, mechanical de-icing: This involves scraping off the ice layer manually or mechanically. However, this requires repeated operations, which is time-consuming and labor-intensive, and poses safety hazards such as falls and scratches.

[0005] Secondly, vibration de-icing. This involves using a vibrating motor operating at the resonant frequency of the axial flow fan blades to break up the ice layer on the blades. However, this method carries the risk of damaging the fan blades or even the fan components.

[0006] Third, electric heating de-icing. This requires changing the structure of the axial flow fan, installing the heating device on the blade surface, and using the heating device to heat and de-ice the blades of the axial flow fan. The manufacturing process is complex, energy consumption is high, and the heating is uneven, which can easily cause local overheating and lead to repeated freezing of "ice-water-ice". There is also a risk of the ice detaching.

[0007] Therefore, how to improve the de-icing effect of the de-icing device without changing the structure of the axial flow fan is a technical problem that urgently needs to be solved. Utility Model Content

[0008] This invention provides a de-icing device, an axial flow fan, and an air conditioning system to solve the problem of poor de-icing effect in existing de-icing devices.

[0009] The technical solution of this utility model is a de-icing device, comprising:

[0010] A support housing is provided with a through hole along the axial direction; the support housing is used to be independently assembled on the shroud of the axial flow fan;

[0011] A protective cover is fitted onto the supporting housing, and an annular air intake channel is formed between the supporting housing and the protective cover;

[0012] Mounting plate, the supporting housing is covered on the mounting plate, the mounting plate is provided with a ventilation assembly corresponding to the through hole, and an annular air outlet channel is formed between the supporting housing and the mounting plate;

[0013] A heating assembly is circumferentially disposed within the support housing and at one end away from the protective cover;

[0014] The exhaust assembly draws in cold air from the outside through the air inlet channel, heats the cold air through the heating assembly, and then blows it out through the air outlet channel to the blades of the axial flow fan.

[0015] Furthermore, the edge of the mounting plate is provided with a matching folded edge corresponding to the air outlet channel, and the folded edge is inclined in the direction away from the protective cover, so that the inner diameter of the air outlet channel is continuously reduced.

[0016] Furthermore, the outermost edge of the folded edge is provided with a plurality of fasteners along the circumferential direction, and each fastener is matched with a fastener;

[0017] The mounting plate is spaced apart from the folded edge, and the fastener passes through the fixing member and is connected to the side wall of the support housing.

[0018] Furthermore, a support plate is provided circumferentially on the lower part of the outer side wall of the supporting housing, and the support plate is located below the air inlet of the air inlet channel;

[0019] The support plate is used to form an axial limiting fit with the edge of the central through hole of the axial flow fan shroud facing the end of the de-icing device, so as to independently assemble the support housing and the axial flow fan.

[0020] Furthermore, a collector is provided around the end of the through hole facing the protective cover.

[0021] Furthermore, multiple support members are provided vertically along the circumference between the edge of the collector and the protective cover.

[0022] Furthermore, the support member is provided with a pressure detection device, which is used to detect the weight change of the protective cover.

[0023] Furthermore, the inner wall of the protective cover is provided with a temperature detection device, which is used to detect whether the axial flow fan is icing or covered with snow.

[0024] This utility model also proposes an axial flow fan, which includes the de-icing device described above.

[0025] This utility model also proposes an air conditioning system, which includes the axial flow fan described above.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] This invention uses a heating component circumferentially arranged within the support housing and away from the protective cover to uniformly heat the cold air in the air outlet channel. The heated cold air is then precisely blown from the air outlet of the air outlet channel onto the fan blades of the axial flow fan. The fan blades are entirely enveloped by the hot air, effectively removing ice or snow from the surface of the fan blades, improving the de-icing effect, and preventing problems such as localized overheating or uneven heating of the fan blades. It also avoids the repeated freezing of "ice-water-ice," reducing energy consumption. Furthermore, the de-icing device is independently mounted on the axial flow fan, eliminating the need for additional modifications to the fan's structure. Attached Figure Description

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects and not to describe a particular order.

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of the de-icing device proposed in this utility model;

[0031] Figure 2 This is a schematic diagram of the airflow of the de-icing device proposed in this utility model;

[0032] Figure 3 This is an exploded view of the de-icing device proposed in this utility model;

[0033] Figure 4 This is a partial structural schematic diagram of the de-icing device proposed in this utility model;

[0034] Figure 5 This is a partial cross-sectional view of the air inlet channel proposed in this utility model;

[0035] Figure 6 This is a partial cross-sectional view of the air outlet channel proposed in this utility model;

[0036] Figure 7 This is a schematic diagram of the structure of the axial flow fan proposed in this utility model;

[0037] Figure 8 for Figure 7 An enlarged schematic diagram of reference numeral A in the attached figure.

[0038] Figure label:

[0039] 11. Support shell; 111. Through hole; 112. Support plate; 113. First profile;

[0040] 12. Protective cover; 121. Temperature detection device; 122. Second type of line;

[0041] 13. Air intake duct;

[0042] 14. Mounting plate; 141. Folded edge; 142. Fastener;

[0043] 15. Exhaust fan assembly; 151. Motor; 152. Centrifugal fan blades;

[0044] 16. Air outlet duct;

[0045] 17. Heating assembly; 171. Fixing clip;

[0046] 18. Current collector; 181. Second support plate; 182. Third profile line;

[0047] 19. Support components;

[0048] 21. Wind shield;

[0049] 22. Wind blades;

[0050] 23. Axial flow motor;

[0051] 24. Base;

[0052] 25. Airflow guide ring;

[0053] 26. First support plate. Detailed Implementation

[0054] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model. Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present utility model, and does not imply that every embodiment of the present utility model must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0055] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0056] In existing technologies, axial flow fans are important aerodynamic devices in air conditioning systems, widely used in supply, exhaust, and recirculation air systems. Commercial air conditioning units, such as modular units and air-cooled screw chillers, are typically installed outdoors, making their axial flow fans susceptible to severe weather conditions. In winter, outdoor temperatures are low, and during snowfall or rain, air humidity is high, causing moisture to easily condense and freeze on the surface of the axial flow fan blades, especially when the unit is off, as the blade surface temperature is even lower, making ice or snow accumulation more likely. Ice or snow adhering to the axial flow fan blade surface increases the fan's imbalance, leading to increased vibration and, in severe cases, damage to the fan bearings, blades, or the entire unit frame. Furthermore, ice or snow increases the load on the axial flow fan, causing a sharp increase in starting current. If the current exceeds the motor's rated range, it may cause motor overload or even burnout. Therefore, before starting the unit, it is necessary to check the fan blade surface for ice or snow, and if any is found, it must be cleaned before operation.

[0057] Therefore, in some embodiments, to prevent ice or snow from forming on the surface of the axial flow fan blades 22, such as... Figure 1 and Figure 2 As shown, this utility model proposes a de-icing device, comprising:

[0058] The support housing 11 has a through hole 111 along the axial direction; the support housing 11 is used to be independently assembled on the fan cover 21 of the axial flow fan;

[0059] A protective cover 12 covers the supporting housing 11, and an annular air inlet channel 13 is formed between the supporting housing 11 and the protective cover 12;

[0060] Mounting plate 14, the supporting housing 11 covers the mounting plate 14, the mounting plate 14 is provided with a ventilation assembly 15 corresponding to the through hole 111, and an annular air outlet channel 16 is formed between the supporting housing 11 and the mounting plate 14.

[0061] Heating assembly 17 is circumferentially disposed along one end of the support housing 11 and away from the protective cover 12;

[0062] The exhaust assembly 15 draws in cold air from the outside through the air inlet channel 13, and after the cold air is heated by the heating assembly 17, it is blown from the air outlet channel 16 to the fan blades 22 of the axial flow fan (multiple fan blades 22 and a hub form an impeller, the same applies throughout the text).

[0063] It should be noted that the supporting shell 11 and the protective cover 12 proposed in this embodiment are both hollow cylindrical structures, and the mounting plate 14 is a circular plate; the bottom end of the protective cover 12 is an open structure (the bottom end of the protective cover 12 is equivalent to the end of the protective cover 12 facing the mounting plate 14, the same applies throughout the text), the bottom end of the supporting shell 11 is an open structure (the bottom end of the supporting shell 11 is equivalent to the end of the supporting shell 11 facing the mounting plate 14, the same applies throughout the text), and a circular through hole 111 is provided in the middle of the top end of the supporting shell 11 (the top end of the supporting shell 11 is equivalent to the other end of the supporting shell 11 facing away from the mounting plate 14, the same applies throughout the text).

[0064] The inner diameter of the bottom of the protective cover 12 is larger than the outer diameter of the top of the supporting shell 11. When the protective cover 12 is placed on the supporting shell 11, a gap is formed between the side wall of the protective cover 12 and the side wall of the supporting shell 11. This gap, together with the hollow structure of the protective cover 12, forms an air inlet channel 13, and this gap is equivalent to the air inlet of the air inlet channel 13. The air inlet is a continuous annular structure. In this way, the protective cover 12 can prevent snow and rainwater from entering the interior of the de-icing device, effectively improving the protective performance of the de-icing device. Similarly, the outer diameter of the bottom end of the support housing 11 is greater than or equal to the outer diameter of the mounting plate 14. In this way, when the protective cover 12 is covered on the mounting plate 14, the mounting plate 14 will not protrude outside the support housing 11. The bottom end of the support housing 11 and the mounting plate 14 are spaced apart. This space and the hollow structure of the support housing 11 form the air outlet channel 16. The space between the bottom end of the support housing 11 and the mounting plate 14 is equivalent to the air outlet of the air outlet channel 16. This air outlet is a continuous annular jet air outlet to achieve 360° air supply without dead angles. It can ensure that hot air is delivered to the surface of the fan blade 22 no matter where the axial flow fan is located.

[0065] A continuous heating element 17 is circumferentially arranged inside the support housing 11 at one end away from the protective cover 12; however, it is not limited to circumferentially ...

[0066] In this embodiment, the exhaust assembly 15 consists of a motor 151 and a centrifugal fan blade 152, and the centrifugal fan blade 152 is preferably a backward centrifugal fan blade. The motor 151 passes through the middle of the mounting plate 14, and the centrifugal fan blade 152 is connected to the rotating output end of the motor 151. The centrifugal fan blade 152 is arranged opposite to the through hole 111 of the support housing 11 so as to draw the cold air in the air inlet channel 13 into the air outlet channel 16.

[0067] Thus, when ice or snow accumulates on the blades 22 of the axial flow fan, the control unit (not shown, same throughout) of the axial flow fan will activate the exhaust assembly 15 and the heating assembly 17. The exhaust assembly 15 will then draw the cold air from the inlet duct 13 into the outlet duct 16. The cold air in the outlet duct 16 is heated by the heating assembly 17 to become hot air (the distinction between hot and cold air is based on their relative temperatures, not absolute numerical standards, but the temperature of hot air is always higher than that of cold air), and then blown from the outlet of the outlet duct 16 into the axial flow fan. The surface of the fan blades 22 is designed to ensure that the airflow blown out from the air outlet duct 16 is all hot air, so that the entire fan blades 22 are surrounded by hot air, avoiding problems such as uneven heating or local overheating. This also removes ice or snow from the fan blades 22, ensuring the balance of the axial flow fan and preventing damage to the axial flow fan due to increased vibration. Furthermore, removing ice or snow from the fan blades 22 can reduce the load on the axial flow fan, preventing a sharp increase in starting current that exceeds the rated range of the axial flow motor 23 inside the axial flow fan, which could lead to overload or even burnout of the axial flow motor 23.

[0068] Therefore, this utility model uses a heating component 17 arranged circumferentially along the inside of the support housing 11 and away from the protective cover 12 to uniformly heat the cold air in the air outlet channel 16. Then, the heated cold air is precisely blown from the air outlet of the air outlet channel 16 onto the fan blades 22 of the axial flow fan. The fan blades 22 are completely surrounded by hot air, effectively removing ice or snow from the surface of the fan blades 22, improving the de-icing effect, and preventing the fan blades 22 from overheating locally or heating unevenly. It also prevents the repeated freezing of "ice-water-ice" and reduces energy consumption.

[0069] It should be noted that, as Figure 5As shown, the radius of the entire support housing 11 is b, and the value of b is in the range of 1.6R≤b≤1.8R, where R is the impeller radius of the exhaust assembly 15. If the value of b is too small, the airflow in the air inlet channel 13 will not be able to develop fully, affecting the air intake volume of the exhaust assembly 15. If the value of b is too large, the volume of the de-icing device will be too large, blocking the air inlet area of ​​the axial flow fan using the de-icing device, affecting the air volume of the axial flow fan.

[0070] The axial distance between the support housing 11 and the protective cover 12 is e, and the value of e is in the range of 0.4L≤e≤0.6L, where L is the height of the centrifugal fan blade 152. If the value of e is too small, it will increase the resistance of the air inlet channel 13, resulting in a loss of air intake and affecting the air intake of the de-icing device. If the value of e is too large, it will result in the de-icing device being too large, affecting the convenience of assembly and use.

[0071] Furthermore, the radius of the first profile 113 of the supporting housing 11 is r1, and the value of r1 is r1≥0.6L; the radius of the second profile 122 of the protective cover 12 is r2, and the value of r2 is r2≥0.6L; where L is the height of the centrifugal fan blade 152; the purpose of the values ​​of r1 and r2 is to further reduce the resistance of the air inlet channel 13, reduce the loss of air intake, and ensure the air intake of the de-icing device.

[0072] The first profile 113 refers to the outline of the cross-section of the supporting shell 11, and the radius r1 of the first profile 113 refers to the radius of curvature of the geometric center line (i.e., the mid-surface) of the supporting shell 11; the second profile 122 refers to the outline of the cross-section of the protective cover 12, and the radius r2 of the second profile 122 refers to the radius of curvature of the geometric center line (i.e., the mid-surface) of the protective cover 12.

[0073] The height of the protective cover 12 is d, and the value of d is 1.1(e+r1)≤d≤1.3(e+r1). If the value of d is too small, it cannot effectively prevent snow and rainwater from entering the de-icing device, thus affecting the protective performance of the de-icing device; if the value of d is too large, it will affect the air intake conditions of the de-icing device.

[0074] In some embodiments, to increase the airflow velocity of the heated cold air blown onto the fan blades 22 of the axial flow fan, such as... Figure 1 and Figure 3 As shown, the edge of the mounting plate 14 is provided with a matching folded edge 141 at an angle corresponding to the air outlet channel 16. The folded edge 141 is inclined along the side away from the protective cover 12, so that the inner diameter of the air outlet channel 16 is continuously reduced.

[0075] In this way, by continuously narrowing the inner diameter of the air outlet 16, the inner diameter of the air outlet 16 is kept to a minimum. According to Bernoulli's equation, the sum of the static pressure and dynamic pressure of the fluid remains constant. When the air outlet 16 narrows, the fluid's kinetic energy (dynamic pressure) increases, while the static pressure decreases accordingly. This energy conversion forces the heated cold air to accelerate through the narrow area, thereby increasing the airflow velocity. This allows the heated cold air to penetrate the gap between the ice layer and the equipment, melting not only the surface ice but also the inner ice layer for thorough de-icing.

[0076] It should be noted that, as Figure 6 As shown, the angle between the folded edge 141 and the axis of the protective cover 12 is β, and the value of β is in the range of 45°≤β≤60°. If the value of β is too small, the local loss of airflow from the exhaust port of the exhaust assembly 15 into the exhaust channel 16 will be too large, affecting the airflow of the de-icing device. If the value of β is too large, it will affect the airflow angle of the heated cold air blown out through the annular jet nozzle of the exhaust channel 16, so that the heated cold air cannot accurately cover the surface of the fan blade 22 of the axial fan, affecting the de-icing efficiency.

[0077] The inner diameter of the annular jet nozzle of the air outlet 16 is f, and the value of f is in the range of 2mm≤f≤5mm. If the value of f is too small, the loss of hot air when it is blown out through the annular jet nozzle will increase, affecting the air volume of the de-icing device. If the value of f is too large, the airflow velocity of the heated cold air when it is blown out through the annular jet nozzle will be too small, and it will not be able to reach the surface of the fan blade 22, thus failing to effectively remove the ice or snow on the surface of the fan blade 22.

[0078] In some embodiments, to ensure that a stable annular air outlet channel 16 is formed between the support housing 11 and the mounting plate 14, such as Figure 4 As shown, the outermost edge 141 is provided with a plurality of fasteners 142 along the circumferential direction, and each fastener 142 is matched with a fastener (not shown, the same throughout the text);

[0079] The mounting plate 14 is spaced apart from the folded edge 141, and the fastener passes through the fixing member 142 and is connected to the side wall of the support housing 11.

[0080] It should be noted that the fastener proposed in this embodiment is preferably a vibration-damping bolt.

[0081] In other embodiments (not shown in the figure), the outermost side of the folded edge 141 protrudes circumferentially and toward the protective cover 12, and a plurality of fasteners 142 are provided. The fasteners 142 are preferably first snap-fit ​​blocks. The mounting plate 14 is provided with a matching first slot corresponding to the fasteners 142. When the fasteners 142 are matched and snapped into the corresponding first slots, the mounting plate 14 and the folded edge 141 are spaced apart, thereby ensuring that a stable annular air outlet channel 16 is formed between the support housing 11 and the mounting plate 14.

[0082] In some embodiments, to ensure that the de-icing device can be independently assembled with the axial flow fan, such as Figure 4 and Figure 8 As shown, a support plate 112 is provided circumferentially on the lower part of the outer side wall of the support housing 11, and the support plate 112 is located below the air inlet of the air inlet channel 13;

[0083] The support plate 112 is used to form an axial limiting fit with the edge of the central through hole of the axial flow fan shroud 21 facing the end of the de-icing device, so as to independently assemble the support housing 11 and the axial flow fan.

[0084] It should be noted that, as Figure 7 As shown, the axial flow fan proposed in this embodiment includes a shroud 21, a fan blade 22, an axial flow motor 23, a base 24, and a guide ring 25. The axial flow motor 23 is located in the middle of the bottom of the base 24. The rotating output end of the axial flow motor 23 passes through the base 24 and is connected to the fan blade 22. The fan blade 22 is located at the top of the base 24. A continuous annular guide ring 25 is provided around the fan blade 22 at the top of the base 24. The shroud 21 is covered on the side of the guide ring 25 away from the base 24. The shroud 21 has a central through hole in the middle, which is used for independent assembly with a de-icing device.

[0085] Therefore, the edge of the central through hole of the shroud 21, away from the base 24, extends outward and circumferentially to form a first support plate 26. Then, the support housing 11 and the mounting plate 14 located below the support plate 112 are matched and inserted into the central through hole of the shroud 21. The support plate 112 is supported on the first support plate 26 and forms an axial limiting fit. Then, anti-vibration bolts are passed through the support plate 112 and the first support plate 26 in sequence to form a bolted connection, thereby achieving independent assembly of the de-icing device and the axial flow fan, which is convenient for installation and does not require additional changes to the structure of the axial flow fan. Of course, multiple anti-vibration bolts are provided along the circumference of the support plate 112. The support plate 112 can be a continuous or discontinuous annular structure, which is not limited here.

[0086] In other embodiments (not shown in the figure), the pallet 112 is provided with a plurality of second snap-fit ​​blocks circumferentially on the side facing the first support plate 26. The first support plate 26 is provided with a matching second snap-fit ​​slot corresponding to the second snap-fit ​​block. Therefore, the support housing 11 and the mounting plate 14 located below the pallet 112 are matched and inserted into the central through hole of the fan cover 21. The second snap-fit ​​block matches and snaps with the corresponding second snap-fit ​​slot, so that the pallet 112 is supported on the first support plate 26 and forms an axial limiting fit. This achieves the requirement that the de-icing device and the axial flow fan form an independent assembly, which is convenient to install and does not require additional changes to the structure of the axial flow fan.

[0087] In some embodiments, to ensure that the cold air entering through the air inlet duct 13 is guided to the impeller, a uniform velocity and pressure field is established in the front section of the air inlet of the exhaust assembly 15, avoiding local turbulence or separation of the airflow, such as... Figure 1 As shown, a collector 18 is arranged around one end of the through hole 111 facing the protective cover 12.

[0088] It should be noted that, as Figure 3 As shown, the collector 18 proposed in this embodiment is cylindrical, and the collector 18 is provided with a continuous or discontinuous second support plate 181 in the outward circumferential direction facing the top of the protective cover 12. In this way, the collector 18 located below the second support plate 181 is matched and extended into the through hole 111. Then, the second support plate 181 is supported by the edge of the through hole 111 facing one end of the protective cover 12 and forms a fixed connection.

[0089] It should be noted that, as Figure 5 As shown, the radius of the air inlet of the collector 18 is a, and the value of a is in the range of 0.6R≤a≤0.75R, where R is the impeller radius of the exhaust assembly 15. If the value of a is too small, the air intake conditions of the exhaust assembly 15 will be insufficient, affecting the exhaust volume of the exhaust assembly 15. If the value of a is too large, the volume of the exhaust assembly 15 will be too large, blocking the air inlet area of ​​the axial flow fan using the de-icing device, affecting the air volume of the axial flow fan.

[0090] The inner diameter of the air inlet of air inlet channel 13 is c, and the formula for calculating c is:

[0091]

[0092] The purpose of setting the value of c is to ensure that the air inlet area of ​​the air inlet channel 13 is consistent with the air inlet area of ​​the collector 18, thereby reducing the impact of the protective cover 12 on the air intake of the de-icing device.

[0093] The radius of the third type line 182 of the collector 18 is r3, and the value of r3 is in the range of 0.2R≤r3≤0.3R. Setting a reasonable r3 is beneficial to reduce the loss of airflow when entering the exhaust assembly 15, improve the air intake uniformity of the exhaust assembly 15, and improve the working efficiency of the exhaust assembly 15.

[0094] The third profile line 182 refers to the outline of the cross-section of the collector 18, and the radius r3 of the third profile line 182 refers to the radius of curvature of the geometric center line (i.e., the mid-surface) of the collector 18.

[0095] In some embodiments, to ensure that a stable annular air intake channel 13 is formed between the support housing 11 and the protective cover 12, such as Figure 1 As shown, multiple support members 19 are provided vertically in the circumferential direction between the edge of the collector 18 (equivalent to the second support plate 181) and the protective cover 12.

[0096] In some embodiments, such as Figure 1 As shown, the inner wall of the protective cover 12 is provided with a temperature detection device 121, which is used to detect whether the axial flow fan is icing or covered with snow.

[0097] It should be noted that the temperature detection device 121 proposed in this embodiment is preferably a temperature sensor, and the temperature detection device 121 is located in the middle of the inner sidewall of the protective cover 12 facing the through hole 111; and the temperature detection device 121 is electrically connected to the control unit.

[0098] The temperature detection device 121 is used to detect the temperature of the axial flow fan. If the temperature detected by the temperature detection device 121 is lower than the threshold temperature, it can be determined that there is icy or snowy weather and that the axial flow fan is covered with ice or snow. At this time, the temperature detection device 121 will send a temperature electrical signal to the control unit. After receiving the signal, the control unit will start the exhaust assembly 15 and the heating assembly 17. Then, the exhaust assembly 15 will draw the cold air in the air inlet duct 13 into the air outlet duct 16. The cold air in the air outlet duct 16 is heated by the heating assembly 17 and then blown from the air outlet of the air outlet duct 16 onto the surface of the fan blades 22 of the axial flow fan, thereby cleaning the ice or snow on the fan blades 22.

[0099] Furthermore, in order to better determine whether the axial flow fan is icing or snow accumulation, a pressure detection device (not shown, same throughout) is provided on the support member 19. The pressure detection device is used to detect the weight change of the protective cover 12.

[0100] It should be noted that the pressure detection device proposed in this embodiment is preferably a pressure sensor, and at least one support member 19 is provided with a pressure detection device; and the pressure detection device is electrically connected to the control unit.

[0101] The specific judgment process is as follows:

[0102] If the pressure detection device detects that the weight on the protective cover 12 is greater than or equal to the preset weight threshold, it will send a pressure electrical signal to the control unit. At the same time, if the temperature detected by the temperature detection device 121 is less than or equal to 0°C, it indicates that there is ice or snow on the fan blades 22 of the axial flow fan. The control unit will simultaneously start the exhaust assembly 15 and the heating assembly 17, and the de-icing mode will start running to blow the heated cold air onto the surface of the fan blades 22, thereby cleaning the ice or snow on the fan blades 22.

[0103] If the pressure detection device detects a weight on the protective cover 12 that is greater than or equal to a preset weight threshold, and the temperature detected by the temperature detection device 121 is greater than 0°C, it indicates that there are non-ice and snow deposits on the surface of the axial flow fan. The control unit starts the exhaust assembly 15, the heating assembly 17 does not start, and the cleaning mode starts to run in order to clean the non-ice and snow deposits on the surface of the axial flow fan.

[0104] If the pressure detection device detects that the weight on the protective cover 12 is less than the preset weight threshold, it indicates that there is no buildup on the surface of the axial flow fan and the de-icing device will not operate.

[0105] In some embodiments, such as Figure 7 and Figure 8 As shown, this utility model also proposes an axial flow fan, which includes the de-icing device described above.

[0106] Thus, when ice or snow accumulates on the blades 22 of the axial flow fan, the control unit will activate the exhaust assembly 15 and the heating assembly 17. The exhaust assembly 15 will then draw the cold air from the inlet duct 13 into the outlet duct 16. The cold air in the outlet duct 16 will be heated by the heating assembly 17 to become hot air, which will then be blown from the outlet of the outlet duct 16 onto the surface of the blades 22 of the axial flow fan, ensuring that the airflow blowing out of the outlet duct 16 is all hot air, so that the entire blades 22 are enveloped in hot air. To prevent uneven heating or localized overheating, the ice or snow on the fan blades 22 is cleaned, ensuring the balance of the axial flow fan and preventing damage caused by increased vibration. Furthermore, cleaning the ice or snow from the fan blades 22 reduces the load on the axial flow fan, preventing a sharp increase in starting current that exceeds the rated range of the axial flow motor 23, which could lead to overload or even burnout of the motor. This ensures stable operation of the axial flow fan and extends its service life.

[0107] In some embodiments, the present invention also provides an air conditioning system, the air conditioning system including the axial flow fan described above.

[0108] Thus, when ice or snow accumulates on the blades 22 of the axial flow fan, the control unit will activate the exhaust assembly 15 and the heating assembly 17. The exhaust assembly 15 will then draw the cold air from the inlet duct 13 into the outlet duct 16. The cold air in the outlet duct 16 will be heated by the heating assembly 17 to become hot air, which will then be blown from the outlet of the outlet duct 16 onto the surface of the blades 22 of the axial flow fan, ensuring that the airflow blowing out of the outlet duct 16 is all hot air, so that the entire blades 22 are enveloped in hot air. To prevent uneven heating or localized overheating, the ice or snow on the fan blades 22 is cleaned, ensuring the balance of the axial fan and preventing damage caused by increased vibration. Furthermore, cleaning the ice or snow from the fan blades 22 reduces the load on the axial fan, preventing a sharp increase in starting current that exceeds the rated range of the axial motor 23 inside the fan, which could lead to overload or even burnout of the axial motor 23. This ensures stable operation of the air conditioning system and extends its service life.

[0109] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A de-icing device, characterized in that The device comprises: a support shell (11) provided with a through hole (111) in the axial direction, and used for being independently assembled on a shroud of an axial flow fan; a protective cover (12) covering the support shell (11), and forming an annular air inlet channel (13) between the support shell (11) and the protective cover (12); a mounting plate (14) on which the support shell (11) is covered, and provided with an air extraction assembly (15) corresponding to the through hole (111), and forming an annular air outlet channel (16) between the support shell (11) and the mounting plate (14); a heating assembly (17) circumferentially arranged along an end of the support shell (11) away from the protective cover (12). The air extraction assembly (15) extracts cold air from the outside through the air inlet channel (13), and blows the cold air to the impeller of the axial flow fan after the cold air is heated by the heating assembly (17).

2. The de-icing device according to claim 1, characterized in that An edge of the mounting plate (14) is provided with a matched folding edge (141) inclined corresponding to the air outlet channel (16), and the folding edge (141) is inclined along a side away from the protective cover (12), so that the inner diameter of the air outlet channel (16) is continuously reduced.

3. The de-icing device of claim 2, wherein An outermost side of the folding edge (141) is provided with a plurality of fixing members (142) in the circumferential direction, and each fixing member (142) is matched with a fastener; The mounting plate (14) is spaced apart from the folding edge (141), and the fastener is connected to the side wall of the support shell (11) after passing through the fixing member (142).

4. The de-icing device of claim 1, wherein A lower portion of the outer side wall of the support shell (11) is provided with a supporting plate (112) in the circumferential direction, and the supporting plate (112) is located below an air inlet of the air inlet channel (13); The supporting plate (112) is used for forming an axial limiting fit with an edge of a central through hole of the shroud of the axial flow fan towards an end of the deicing device, so as to independently assemble the support shell (11) and the axial flow fan.

5. The de-icing device of claim 1, wherein An end of the through hole (111) towards the protective cover (12) is circumferentially provided with a flow collector (18).

6. The de-icing device of claim 5, wherein An edge of the flow collector (18) and the protective cover (12) are vertically provided with a plurality of supporting members (19) in the circumferential direction.

7. The de-icing device of claim 6, wherein The supporting members (19) are provided with a pressure detection device for detecting the weight change of the protective cover (12).

8. The de-icing device of claim 1, wherein An inner side wall of the protective cover (12) is provided with a temperature detection device (121) for detecting whether the axial flow fan is frozen or snowed.

9. An axial flow fan characterised in that, The axial flow fan comprises the deicing device according to any one of claims 1-8.

10. An air conditioning system characterized by, The air conditioning system comprises the axial flow fan according to claim 9.

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