Direct current fan and refrigerator

Abstract

The utility model discloses a direct current fan and a refrigerator. The direct-current fan comprises fan blades and a motor driving the fan blades to rotate, a coil and an acquisition module are arranged in an installation shell of the fan blades, the fan blades rotate to drive the coil to rotate, the coil of the coil and a magnet in the motor of the direct-current fan cut magnetic induction lines to generate current, and current signals of the coil are acquired through the acquisition module. Whether the fan blades of the direct-current fan rotate or not can be judged by judging whether the coil cuts the magnetic induction lines of the motor to generate current or not, and the technical problem that in the prior art, only whether the motor of the direct-current fan operates or not can be determined, and whether the fan blades normally operate or not cannot be known is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerators, in particular to a DC fan and a refrigerator. Background Art

[0002] As an indispensable appliance in modern households, the core function of refrigerators is to prolong the shelf life of food by maintaining a low temperature environment. With technological advancements and rising consumer demand, refrigerator technology has also been continuously evolving. Air-cooled refrigerators, with their advantages such as high cooling efficiency and excellent temperature uniformity, have gradually become the mainstream product in the market.

[0003] Air-cooled refrigerators operate primarily by circulating cool air throughout the refrigerator through a built-in DC fan, achieving rapid and uniform cooling. This design not only improves cooling efficiency but also maintains a more stable temperature inside the refrigerator, helping to preserve food's freshness over time. However, while air-cooled refrigerators offer numerous advantages, they also face some technical challenges.

[0004] Air-cooled refrigerator fan systems can encounter a problem, particularly in high-humidity environments. Because DC fans operate at low temperatures for extended periods, water vapor in the air can sublimate when it encounters the cold fan blades. This occurs when water vapor in the air directly transforms into solid ice, forming a layer of ice on the blades. Over time, this layer of ice can gradually thicken, eventually blocking the fan and causing the air-cooling system to malfunction. However, existing refrigerators can only determine whether the DC fan is operating based on the power supply to the DC fan motor. However, if the fan blades are frozen or blocked by foreign objects, the motor remains energized but the blades no longer operate. This significantly reduces the refrigerator's cooling performance and can even lead to temperature runaway. This not only affects food preservation but can also cause food spoilage, resulting in financial losses and health risks for consumers. Utility Model Content

[0005] In order to solve the technical problem in the prior art that the existing refrigerator cannot know whether the blades of the DC fan are running, the utility model provides a DC fan and a refrigerator.

[0006] The technical solution adopted in this utility model is:

[0007] The utility model proposes a DC fan, which includes fan blades and a motor that drives the fan blades to rotate. It also includes: a coil that rotates with the fan blades and is used to cut the motor's magnetic flux lines to generate current, and a collection module that is electrically connected to the coil and collects current signals.

[0008] Furthermore, the collection module includes: a conductive component and a collection component, the positive pole and the negative pole of the coil are respectively connected to the conductive component to transfer the current to the conductive component, and the collection component is in contact with the conductive component to collect the current on the conductive component.

[0009] Furthermore, the conductive component includes: a first conductive block and a second conductive block, the second conductive block and the first conductive block are insulated, the coil surrounds the first conductive block and the second conductive block, the positive pole of the coil is connected to the first conductive block, and the negative pole of the coil is connected to the second conductive block.

[0010] Furthermore, the collection component includes: a first power-collecting spring and a second power-collecting spring, the first power-collecting spring contacts the first conductive block, the second power-collecting spring contacts the second conductive block, and the first power-collecting spring and the second power-collecting spring are respectively connected to leads for collecting the current transmitted by the coil to the first conductive block and the second conductive block.

[0011] Furthermore, the first conductive block is a first bearing, the second conductive block is a second bearing, the first bearing and the second bearing are arranged in a mounting shell in the middle of the fan blade, the second bearing is sleeved on the outside of the first bearing, an insulating layer is provided between the first bearing and the second bearing, and the coil surrounds the outside of the second bearing.

[0012] Furthermore, the fan blade includes a mounting shell and a fan blade arranged around the mounting shell, a mounting hole is provided in the mounting shell for connecting with the rotor of the motor, and the coil and the acquisition module are arranged in the mounting shell.

[0013] Furthermore, the first power extraction spring and the second power extraction spring are made of conductive material.

[0014] Furthermore, the coil is arranged on the inner wall of the mounting shell.

[0015] The utility model also provides a refrigerator comprising any one of the DC fans.

[0016] Furthermore, the first power taking spring piece and the second power taking spring piece are connected to the mainboard of the refrigerator via leads.

[0017] Compared with the prior art, the present invention proposes a DC fan, in which a coil and an acquisition module are arranged in a mounting shell of the DC fan blades. The rotation of the blades drives the coil to rotate, and the coil and the magnet in the DC fan motor cut the magnetic flux lines to generate current. The current signal of the coil is collected by the acquisition module. That is, whether the DC fan blades are rotating can be judged by whether the coil cuts the magnetic flux lines of the motor to generate current, which solves the technical problem that the prior art can only determine whether the DC fan motor is running but cannot know whether the blades are operating normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0020] Figure 2 A side view of an embodiment of the present utility model;

[0021] 11. DC fan; 12. Fan blades; 13. Mounting case;

[0022] 2. Coil;

[0023] 3. Conductive component; 31. First conductive block; 32. Second conductive block; 33. Insulating layer;

[0024] 4. Collection component; 41. First power-collecting shrapnel; 42. Second power-collecting shrapnel. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is 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.

[0026] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0027] As an indispensable appliance in modern households, the core function of refrigerators is to prolong the shelf life of food by maintaining a low temperature environment. With technological advancements and rising consumer demand, refrigerator technology has also been continuously evolving. Air-cooled refrigerators, with their advantages such as high cooling efficiency and excellent temperature uniformity, have gradually become the mainstream product in the market.

[0028] Air-cooled refrigerators operate primarily by circulating cool air throughout the refrigerator through a built-in DC fan, achieving rapid and uniform cooling. This design not only improves cooling efficiency but also maintains a more stable temperature inside the refrigerator, helping to preserve food's freshness over time. However, while air-cooled refrigerators offer numerous advantages, they also face some technical challenges.

[0029] Air-cooled refrigerator fan systems can encounter a problem, particularly in high-humidity environments. Because DC fans operate at low temperatures for extended periods, water vapor in the air can sublimate when it encounters the cold fan blades. This occurs when water vapor in the air directly transforms into solid ice, forming a layer of ice on the blades. Over time, this layer of ice can gradually thicken, eventually blocking the fan and causing the air-cooling system to malfunction. However, existing refrigerators can only determine whether the DC fan is operating based on the power supply to the DC fan motor. However, if the fan blades are frozen or blocked by foreign objects, the motor remains energized but the blades no longer operate. This significantly reduces the refrigerator's cooling performance and can even lead to temperature runaway. This not only affects food preservation but can also cause food spoilage, resulting in financial losses and health risks for consumers.

[0030] like Figure 1-2 As shown, the present invention provides a DC fan 11, which includes blades 12 and a motor that drives the blades 12 to rotate. The fan 11 also includes a coil 2 that rotates with the blades 12 and a collection module for collecting the current signal of the coil 2. The coil 2 is disposed on the blades 12 and is used to cut the motor's magnetic flux lines to generate current. The collection module collects the current signal of the coil 2 and determines whether the blades 12 are rotating based on the current signal.

[0031] Through the interaction between coil 2 and the magnets within the motor, when blades 12 rotate, coil 2 follows the rotation of blades 12, cutting through the magnetic flux lines and generating a current signal. By directly detecting the current signal generated by coil 2 through the acquisition module, the rotation of blades 12 can be determined, providing a simple and effective method for monitoring the rotation status. This allows for timely detection of DC fan 11 stalling, thus preventing overheating and other potential safety hazards.

[0032] The fan blade 12 includes a mounting shell 13 and a fan blade arranged around the mounting shell 13 . A mounting hole is provided in the mounting shell 13 for connecting with the rotor of the motor. The coil 2 and the acquisition module are arranged in the mounting shell 13 .

[0033] In a further embodiment, the acquisition module includes a conductive component 3 and a collection component 4. The positive and negative electrodes of the coil 2 are respectively connected to the conductive component 3 to transmit the current signal to the conductive component 3. The collection component 4 contacts the conductive component 3 to collect the current signal transmitted by the coil 2 to the conductive component 3.

[0034] The acquisition module is clearly divided into a conductive component 3 and an acquisition component 4, making the overall structure clearer. The coil 2 is directly connected to the conductive component 3, reducing losses during current transfer and improving transfer efficiency.

[0035] In a further embodiment, the conductive assembly 3 includes: a first conductive block 31, a second conductive block 32, and a coil 2. The first conductive block 31 and the second conductive block 32 are disposed within the mounting housing 13 of the fan blade 12, and are insulated from each other. The coil 2 is disposed around the first conductive block 31 and the second conductive block 32, with the positive electrode of the coil 2 connected to the first conductive block, and the negative electrode of the coil 2 connected to the second conductive block.

[0036] The first conductive block 31 and the second conductive block 32 are clearly positioned within the mounting housing 13 of the fan blade 12 and are insulated from each other. This clear separation not only helps ensure that current flows along the correct path, but also improves the safety and reliability of the assembly. The coil 2 is arranged around these two conductive blocks, making the entire coil 2 relatively compact and easy to implement. The positive pole of the coil 2 is connected to the first conductive block 31, and the negative pole is connected to the second conductive block 32. This connection ensures that current flows along a predetermined path when passing through the coil 2, thereby improving current transmission efficiency. Because the first conductive block 31 and the second conductive block 32 are insulated from each other, unnecessary short circuits or leakage of current between them can be avoided, further improving current utilization efficiency. By monitoring the current changes in the coil 2, the rotation state of the fan blade 12 can be accurately determined. When the fan blade 12 rotates, the coil 2 cuts through the magnetic flux lines, generating current. This current change can be used to trigger the corresponding monitoring or control mechanism. This monitoring and control mechanism is relatively simple and reliable to implement because it directly relies on the current changes in the coil 2 without the need for additional sensors or detection elements.

[0037] In a specific embodiment, the first conductive block 31 and the second conductive block 32 can be block structures made of highly conductive materials, which are firmly fixed in the mounting shell 13 and insulated from each other. The coil 2 can be a ring structure wound by a thin wire, which surrounds the first conductive block 31 and the second conductive block 32 and is connected to them respectively. When the motor starts and drives the fan blades 12 to rotate, the coil 2 cuts the magnetic flux lines to generate current. This current change can be captured and processed by the corresponding monitoring circuit, thereby realizing real-time monitoring of the rotation state of the fan blades 12.

[0038] The acquisition component 4 contacts the first and second conductive blocks 31, 32 and is used to collect the current transmitted by the coil 2 to the first and second conductive blocks 31, 32. The acquisition component 4 directly contacts the first and second conductive blocks 31, 32, enabling direct collection of the current transmitted by the coil 2. This avoids current loss and interference during transmission, thereby improving the accuracy of current monitoring. The acquisition component 4 allows real-time monitoring of current changes during operation of the DC fan 11, providing reliable data support for fault diagnosis, energy efficiency management, and optimized control of the DC fan 11. When the DC fan 11 experiences a current anomaly, the acquisition component 4 quickly detects this change and alerts the user or system administrator through a corresponding fault warning mechanism, allowing timely measures to prevent further escalation of the fault, thereby enhancing the reliability of the DC fan 11. The acquisition component 4 can also be used in conjunction with an overload protection device. When the current exceeds a set threshold, the overload protection device automatically cuts off the power supply, protecting the DC fan 11 from damage and improving the safety of the DC fan 11.

[0039] In a further embodiment, the collection component 4 includes a first power extraction spring and a second power extraction spring. The first power extraction spring 41 and the second power extraction spring 42 are made of a conductive material. The first power extraction spring is in contact with the first conductive block 31, and the second power extraction spring is in contact with the second conductive block 32. The first power extraction spring and the second power extraction spring are respectively connected to leads for collecting the current transmitted from the coil 2 to the first conductive block 31 and the second conductive block 32. The first power extraction spring and the second power extraction spring are respectively fixed to the base of the DC fan 11 or the body of the motor and remain stationary. When the first conductive block 31 and the second conductive block 32 rotate with the fan blades 12, the first power extraction spring 41 and the second power extraction spring 42 remain in contact with their respective corresponding conductive blocks.

[0040] The spring design typically has a certain degree of elasticity and resilience, allowing it to adapt to certain vibrations or displacements, maintaining contact continuity and thus improving the stability of current collection. When coil 2 cuts through the magnetic flux lines, the current is transferred through the first conductive block 31 and the second conductive block 32, and the two current-collecting springs can collect the corresponding current.

[0041] In a further embodiment, the first conductive block 31 is a first bearing, and the second conductive block 32 is a second bearing. The first and second bearings are annular in shape. The first bearing is disposed within a mounting housing 13 in the middle of the fan blade 12, while the second bearing is sleeved outside the first bearing. An insulating layer 33 is provided between the first and second bearings, and the coil 2 surrounds the outside of the second bearing. By directly designing the first and second bearings as conductive blocks and cleverly sleeved within the mounting housing 13 of the fan blade 12, the DC fan 11 achieves a compact structure. The coil 2 surrounds the outside of the second bearing, further improving the integration of the entire DC fan 11 assembly and making the internal structure of the DC fan 11 more concise and orderly. The metal material of the bearings, as conductive blocks, ensures excellent conductivity, facilitating smooth current transmission. The provision of the insulating layer 33 effectively isolates the electrical connection between the first and second bearings, avoiding the risk of current short circuits and improving the safety and reliability of the DC fan 11. The coil 2 surrounds the outside of the second bearing. When the fan blade 12 rotates, the current changes generated by the coil 2 cutting through the magnetic flux lines can be used to monitor the rotation state of the fan blade 12 in real time. The implementation of this monitoring mechanism is relatively simple and reliable, which helps to achieve accurate control of the rotation speed of the DC fan 11 and improve the performance stability of the DC fan 11.

[0042] In a specific embodiment, when the motor starts, the motor's rotor drives the fan blades 12 to rotate, thereby driving the first and second bearings to rotate together. Because the coil 2 surrounds the outside of the second bearing and is connected to the first and second bearings, when the fan blades 12 rotate, the coil 2 cuts the magnetic flux lines and generates current. This current change can be captured and processed by the corresponding monitoring circuit, thereby enabling real-time monitoring of the rotation state of the fan blades 12. The DC fan 11 of the present invention has a compact structure and high integration, reducing manufacturing cost and complexity.

[0043] The fan blade 12 includes a mounting shell 13 and a fan blade arranged around the mounting shell 13. The mounting shell 13 is provided with a mounting hole for connecting to the rotor of the motor, and the coil 2 is arranged on the inner wall of the mounting shell 13. The fan blade 12 is composed of the mounting shell 13 and the fan blade. The coil 2 is cleverly arranged in the mounting shell 13 and connected to the mounting shell 13. Through the interaction between the coil 2 and the magnet in the motor, when the fan blade 12 rotates, the coil 2 cuts the magnetic flux lines to generate current. By directly detecting whether the coil 2 generates current to determine whether the fan blade 12 is rotating, a simple and effective rotation state monitoring method is provided. The situation that the DC fan 11 stops working can be discovered in time, thereby avoiding overheating or other potential safety hazards.

[0044] The present utility model also proposes a refrigerator, comprising the DC fan 11 of the present application. The first power-collecting spring is in contact with the first conductive block 31, the second power-collecting spring is in contact with the second conductive block 32, and the first power-collecting spring and the second power-collecting spring are respectively connected to leads for collecting the current transmitted by the coil 2 to the first conductive block 31 and the second conductive block 32. The first power-collecting spring piece and the second power-collecting spring piece are connected to the main board of the refrigerator through leads. By connecting the power-collecting spring piece to the main board through leads, the main board of the refrigerator can determine whether the fan blades are working normally through electrical signals. If the collected current value is 0, it is determined that the DC fan is frozen. At this time, the DC fan voltage is raised to the maximum so that the DC fan can start, and the judgment is made again after 10 seconds.

[0045] If it is determined that no current freeze is detected again, the cooling will be stopped immediately and the defrosting process will be started.

[0046] If the feedback current is collected again, it is determined that the DC fan is too frosted, and the DC fan will maintain the highest speed until the cooling is completed.

[0047] If the collected DC fan current is lower than the preset range, it is determined that the fan blades are covered with frost, and the DC fan speed is increased to the maximum speed. The DC fan is operated until the collected current reaches the preset range, and the DC fan speed begins to recover to the target speed.

[0048] If the collected DC fan current reaches or exceeds the preset range, the DC fan is considered normal and runs at the target speed.

[0049] Compared with the prior art, the present invention proposes a DC fan, in which a coil and an acquisition module are arranged in a mounting shell of the DC fan blades. The rotation of the blades drives the coil to rotate, and the coil and the magnet in the DC fan motor cut the magnetic flux lines to generate current. The current signal of the coil is collected by the acquisition module. That is, whether the DC fan blades are rotating can be judged by whether the coil cuts the magnetic flux lines of the motor to generate current, which solves the technical problem that the prior art can only determine whether the DC fan motor is running but cannot know whether the blades are operating normally.

[0050] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0052] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A DC fan comprising blades and a motor for driving the blades to rotate, characterized in that: Also includes: A coil that rotates along with the fan blades and is used to cut the motor's magnetic flux lines to generate current, and a collection module that is electrically connected to the coil and collects current signals.

2. The DC fan according to claim 1, wherein: The collection module includes: a conductive component and a collection component. The positive and negative poles of the coil are respectively connected to the conductive components to transfer current to the conductive component. The collection component contacts the conductive component to collect the current on the conductive component.

3. The DC fan according to claim 2, wherein: The conductive component includes: a first conductive block and a second conductive block, the second conductive block and the first conductive block are insulated, the coil surrounds the first conductive block and the second conductive block, the positive pole of the coil is connected to the first conductive block, and the negative pole of the coil is connected to the second conductive block.

4. The DC fan according to claim 3, wherein: The collection component includes: a first power-collecting elastic fragment and a second power-collecting elastic fragment, the first power-collecting elastic fragment contacts the first conductive block, the second power-collecting elastic fragment contacts the second conductive block, and the first power-collecting elastic fragment and the second power-collecting elastic fragment are respectively connected to leads for collecting the current transmitted by the coil to the first conductive block and the second conductive block.

5. The DC fan according to claim 3, wherein: The first conductive block is a first bearing, the second conductive block is a second bearing, the first bearing and the second bearing are arranged in a mounting shell in the middle of the fan blade, the second bearing is sleeved on the outside of the first bearing, an insulating layer is provided between the first bearing and the second bearing, and the coil surrounds the outside of the second bearing.

6. The DC fan according to claim 1, wherein: The fan blade includes a mounting shell and a fan blade arranged around the mounting shell. A mounting hole is provided in the mounting shell for connecting with the rotor of the motor. The coil and the acquisition module are arranged in the mounting shell.

7. The DC fan according to claim 4, wherein: The first power extraction spring and the second power extraction spring are made of conductive material. The DC fan according to claim 6 , wherein the coil is arranged on an inner wall of the mounting shell.

9. A refrigerator, characterized in that: The DC fan comprises the DC fan according to any one of claims 1 to 8.

10. The refrigerator according to claim 9, wherein: The first power taking spring piece and the second power taking spring piece are connected to the mainboard of the refrigerator via leads.

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