Refrigeration equipment

Abstract

The utility model relates to the technical field of refrigeration devices, in particular to refrigeration equipment. The refrigeration equipment comprises an equipment body and a magnetic ring, the equipment body is provided with a power line, the power line comprises a zero line, a live line and a protection grounding line, the protection grounding line is connected with a metal shell of the equipment body, and when the refrigeration equipment is arranged on the ground with metal steel bars, an insulating medium between the equipment body and the metal ground is concrete. An equivalent distributed capacitor is formed between the equipment body and the metal ground, an equivalent distributed inductor is formed on the protection grounding wire, the equivalent distributed capacitor and the equivalent distributed inductor form an LC resonance circuit, the protection grounding wire is sleeved with a magnetic ring, a damping effect is introduced into a common-mode interference path between the refrigeration equipment and the metal ground, and the damping effect is improved. The amplitude of a disturbance voltage resonance point is obviously reduced, and the refrigeration equipment is ensured to more stably meet the requirement of the national electromagnetic compatibility standard.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, specifically to a refrigeration device. Background Technology

[0002] With the widespread use of household appliances and the increasingly stringent electromagnetic compatibility (EMC) standards, EMC interference testing of household appliances has become one of the important indicators for evaluating product conformity.

[0003] In existing technologies, analysis of the resonance phenomenon of refrigerator interference voltage reveals that in practical applications, refrigerators are typically placed on surfaces with reinforced metal, such as inside buildings. The extensive use of reinforced metal in building structures creates a large-area reference metal floor. When a refrigerator is placed inside a building, the metal casing of the refrigerator and the metal floor, with concrete as the dielectric, form an equivalent distributed capacitance. Simultaneously, the refrigerator's ground wire inevitably possesses an equivalent distributed inductance. The equivalent distributed inductance of the ground wire, combined with the equivalent distributed capacitance between the refrigerator and the building's metal floor, constitutes an LC resonant circuit. At specific frequency bands, the resonance phenomenon of this LC resonant circuit is particularly pronounced; the amplitude at this resonant point is not only high but also extremely unstable. Therefore, in the actual refrigerator design process, it is urgent to find an effective and stable method to eliminate or suppress the sharp resonance point of the interference voltage caused by the aforementioned resonant circuit, ensuring that the refrigerator product meets the national standard's interference voltage limit requirements. Utility Model Content

[0004] The purpose of this invention is to at least solve the problem of an abnormally sharp and unstable amplitude at the resonance point caused by the formation of an LC resonant circuit between the refrigeration equipment and the metal floor. This objective is achieved through the following technical solution:

[0005] The first aspect of this utility model provides a refrigeration device, comprising:

[0006] Equipment body;

[0007] The device body is provided with a power cord, which includes a neutral wire, a live wire and a protective ground wire. The protective ground wire is connected to the metal casing of the device body. The device body can form an equivalent distributed capacitance with the metal ground, and the protective ground wire forms an equivalent distributed inductance.

[0008] A magnetic ring is fitted around the outer periphery of the protective grounding wire.

[0009] According to the refrigeration equipment of this invention, by installing a magnetic ring over the protective grounding wire, allowing the protective grounding wire to pass inside the magnetic ring, an appropriate damping effect is introduced into the common-mode interference path between the refrigeration equipment and the metal ground. The mechanism of this damping effect lies in the fact that the magnetic ring has significant impedance and loss characteristics for high-frequency currents. When the high-frequency resonant current in the protective grounding wire passes through the magnetic ring, some of the high-frequency resonant energy is consumed due to the magnetic hysteresis loss and eddy current loss of the magnetic ring itself, thereby effectively suppressing the amplitude of the high-frequency resonant current on the protective grounding wire. Therefore, this invention, by utilizing the damping characteristics of the magnetic ring, effectively controls the LC resonance effect formed between the protective grounding wire, the equipment body, and the metal ground, significantly reducing the amplitude of the interference voltage resonance point, ensuring that the refrigeration equipment more stably meets the requirements of national electromagnetic compatibility standards, and improving the electromagnetic compatibility performance of the refrigeration equipment.

[0010] In addition, the refrigeration equipment according to this utility model may also have the following additional technical features:

[0011] In some embodiments of this invention, the magnetic ring is disposed within the device body.

[0012] In some embodiments of this utility model, the device body includes an electrical control box, the magnetic ring is disposed inside the electrical control box, and the protective grounding wire passes through the electrical control box and is separated from the live wire and the neutral wire.

[0013] In some embodiments of this utility model, the electrical control box has a through hole, and the portion of the protective grounding wire located inside the electrical control box has a bent structure, with both ends of the bent structure passing through the through hole.

[0014] In some embodiments of this utility model, the protective grounding wire is sequentially wound around the inner and outer sides of the magnetic ring.

[0015] In some embodiments of this utility model, the length of the magnetic ring along the length direction of the protective grounding wire is in the range of 7mm to 9mm.

[0016] In some embodiments of this utility model, the length of the magnetic ring is 8mm.

[0017] In some embodiments of this utility model, the magnetic ring is a ferrite magnetic ring.

[0018] In some embodiments of this invention, the outer side of the magnetic ring is covered with an insulating layer.

[0019] In some embodiments of this utility model, the refrigeration device is a refrigerator. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 A schematic diagram of the structure of a refrigeration device according to an embodiment of the present invention is shown.

[0022] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 A schematic diagram of an embodiment in which the protective grounding wire is wound around a magnetic ring is shown.

[0024] Figure 4 A schematic diagram of the EMC detection system is shown.

[0025] Figure 5 A graph showing the interference voltage test data obtained without using the refrigeration equipment described in this application;

[0026] Figure 6 This is a graph showing the test data of the disturbance voltage measured using the refrigeration equipment described in this application.

[0027] The attached figures are labeled as follows:

[0028] 100. Refrigeration equipment;

[0029] 10. Equipment body; 20. Electrical control box; 30. Power cord; 31. Live wire; 32. Neutral wire; 33. Protective grounding wire; 331. Equivalent distributed inductance; 40. Magnetic ring;

[0030] 200. EMC testing system; 201. Testing device; 202. Testing platform; 2021. Equivalent distributed capacitance; 203. Metal floor. Detailed Implementation

[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0032] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0035] like Figures 1 to 3As shown, according to an embodiment of this utility model, a refrigeration device 100 is proposed. The refrigeration device 100 includes a device body 10 and a magnetic ring 40. The device body 10 is provided with a power line 30, which includes a neutral wire 32, a live wire 31, and a protective grounding wire 33. The protective grounding wire 33 is connected to the metal shell of the device body 10. When the refrigeration device 100 is installed in a building, the steel structure in the building forms a metal floor. The insulating medium between the device body 10 and the metal floor is concrete. Then, an equivalent distributed capacitance 2021 will be formed between the device body 10 and the metal floor, and an equivalent distributed inductance 331 will be formed by the protective grounding wire 33. The equivalent distributed capacitance 2021 and the equivalent distributed inductance 331 will form an LC resonant circuit. Therefore, a magnetic ring 40 is sleeved on the outer periphery of the protective grounding wire 33 to solve the problem of the LC resonant circuit.

[0036] According to the refrigeration equipment 100 of this invention, by installing a magnetic ring 40 over the protective grounding wire 33, the protective grounding wire 33 passes through the magnetic ring 40, introducing an appropriate damping effect into the common-mode interference path between the refrigeration equipment 100 and the metal ground. The mechanism of this damping effect lies in the fact that the magnetic ring 40 has significant impedance and loss characteristics for high-frequency currents. When the high-frequency resonant current in the protective grounding wire 33 passes through the magnetic ring 40, some of the high-frequency resonant energy is consumed due to the hysteresis loss and eddy current loss of the magnetic ring 40 itself, thereby effectively suppressing the amplitude of the high-frequency resonant current on the protective grounding wire 33. Therefore, by utilizing the damping characteristics of the magnetic ring 40, this invention effectively controls the LC resonance effect formed between the protective grounding wire 33, the equipment body 10, and the metal ground, significantly reducing the amplitude of the interference voltage resonance point, ensuring that the refrigeration equipment 100 more stably meets the requirements of national electromagnetic compatibility standards, and improving the electromagnetic compatibility performance of the refrigeration equipment 100.

[0037] In some embodiments, the magnetic ring 40 is disposed inside the device body 10. Since the magnetic ring 40 is located inside the device body 10, it can be easily fixed and installed using the existing internal structure of the device body 10, thereby avoiding the need for additional support components or installation structures required for external installation. This significantly simplifies the installation process of the magnetic ring 40, improves assembly efficiency, and reduces assembly costs. Secondly, placing the magnetic ring 40 inside the device body 10 makes the device body 10 look cleaner and more aesthetically pleasing, avoiding the problem of an exposed magnetic ring 40 causing a cluttered appearance, and improving the overall design quality of the refrigeration equipment 100. Furthermore, placing the magnetic ring 40 inside the device body 10 protects it from adverse effects from external environmental factors (such as dust or moisture) on its performance, thereby improving the long-term reliability and stability of the magnetic ring 40.

[0038] Furthermore, the device body 10 includes an electrical control box 20, a magnetic ring 40 disposed within the electrical control box 20, and a protective grounding wire 33 passing through the electrical control box 20 and separated from the live wire 31 and neutral wire 32. Typically, the neutral wire 32, live wire 31, and protective grounding wire 33 are encased in a casing to form a power line 30. After the power line 30 is connected to the electrical control box 20, the neutral wire 32, live wire 31, and protective grounding wire 33 are separated. The neutral wire 32 and live wire 31 are connected to the internal circuit. The electrical control box 20 provides a space for the magnetic ring 40 to be installed and fixed, and the magnetic ring 40 is fitted around the outer periphery of the protective grounding wire 33. In other embodiments of this application, the magnetic ring 40 may not be disposed within the electrical control box, and may not only be fitted around the outer periphery of the protective grounding wire 33, but may also be directly fitted around the outer periphery of the power line 30, as long as the protective grounding wire 33 can pass through the magnetic ring 40. However, this requires increasing the size of the magnetic ring 40.

[0039] Furthermore, the control box 20 has a through hole, and the portion of the protective grounding wire 33 inside the control box 20 has a bent structure. Both ends of this bent structure pass through the through hole, meaning the protective grounding wire 33 enters the control box, passes through the magnetic ring 40, and then exits through the through hole to connect to the metal base of the refrigeration equipment 100. By creating only one through hole in the control box 20, the protective grounding wire 33 can enter and exit through a single through hole, eliminating the need for two through holes and simplifying the design and manufacturing process of the control box 20. Simultaneously, the bent structure allows the protective grounding wire 33 to be wound a longer length relative to the magnetic ring 40, thereby increasing energy dissipation and damping effects under high-frequency interference conditions and further improving overall EMC performance.

[0040] In some embodiments, the protective grounding wire 33 is wound sequentially around the inner and outer sides of the magnetic ring 40, that is, it is wound around the magnetic ring 40 in a winding manner, rather than simply passing through the magnetic ring 40 in a straight line once. Compared with the method of passing through the magnetic ring 40 in a straight line once, it has the following advantages. First, by winding the protective grounding wire 33 multiple times on the inner and outer sides of the magnetic ring 40, the coupling degree between the magnetic ring 40 and the protective grounding wire 33 is increased, which significantly increases the path length and coupling magnetic flux density of the high-frequency common-mode current through the magnetic ring 40, thereby further improving the impedance value of the magnetic ring 40 to high-frequency interference and enhancing the energy dissipation capability of the high-frequency interference current. Secondly, the winding method significantly improves the impedance characteristics of the magnetic ring 40 and the hysteresis loss characteristics of the magnetic core, making the damping effect of the magnetic ring 40 more prominent under high-frequency conditions. The quality factor of the LC resonant circuit (quality factor Q is a dimensionless parameter that measures the "resonance sharpness" of a resonant circuit; it reflects the ratio of stored energy to dissipated energy at the resonant frequency. A larger Q indicates a sharper resonant peak and a narrower bandwidth, while a smaller Q indicates a blunter resonant peak and a wider bandwidth) is further reduced. This allows for more effective attenuation of the high-frequency resonant current, thereby more effectively weakening the resonance phenomenon between the refrigeration equipment 100 and the metal ground, and significantly improving the overall electromagnetic compatibility performance. Furthermore, this winding method makes the impedance characteristics of the magnetic ring 40 more stable over a wider frequency range, effectively suppressing common-mode interference signals over a wider frequency range, thus improving the EMC performance stability of the equipment under various complex interference conditions.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, the protective grounding wire 33 has a bent structure, that is, the protective grounding wire 33 passes through the magnetic ring 40 from the inside of the magnetic ring 40, and then returns from the outside of the magnetic ring 40 through the bent structure, which is equivalent to winding it around the magnetic ring 40. This specific embodiment has a simple structure.

[0042] Specifically, such as Figure 3 As shown, multiple turns (3 to 7 turns) are sequentially wound around the inner and outer sides of the magnetic ring 40, with a certain spacing between each turn. This specific embodiment has stronger energy dissipation and damping effects, and can significantly improve the EMC performance of the refrigeration equipment 100 in complex electromagnetic environments.

[0043] In some implementations, the length of the magnetic ring 40 along the length of the protective grounding wire 33 is in the range of 7mm to 9mm. This length range allows the magnetic ring 40 to provide sufficient impedance to effectively suppress common-mode resonance in the target frequency band (e.g., 8MHz), reducing amplitude fluctuations at the resonant point and thus making the test data more stable and accurate. Simultaneously, this size range ensures that the magnetic ring 40 has sufficient physical length to introduce the necessary damping. Finally, this size range is suitable for integration onto the protective grounding wire 33, without occupying excessive space, and can be well matched with existing circuit designs, maintaining a compact overall structure, facilitating mass production and application.

[0044] Specifically, the length of the magnetic ring 40 is 8mm.

[0045] Furthermore, the outer diameter of the magnetic ring 40 is between 15mm and 17mm, and the inner diameter is between 8mm and 10mm. For typical household refrigeration equipment 100, 1.5mm is commonly used. 2 The protective grounding wire 33, its outer diameter (including the insulation layer) is likely to be approximately 2 to 4 millimeters, while for 2.5 mm... 2 The protective grounding wire 33, or a larger specification, may have an outer diameter ranging from 4 to 8 mm. Therefore, the minimum inner diameter of the magnetic ring 40 is 8 mm, ensuring that the protective grounding wire 33 of most refrigeration devices 100 can be installed inside the magnetic ring 40. Furthermore, the precisely defined outer and inner diameter dimensions ensure that the magnetic ring 40 has ideal impedance characteristics in the target frequency band, thereby more effectively providing high-frequency damping, suppressing common-mode resonance, and reducing sharp interference peaks during testing. Simultaneously, the determined outer-to-inner-diameter ratio ensures that the magnetic ring 40 has high magnetic loss characteristics at high frequencies, thereby better absorbing and attenuating high-frequency interference signals, further improving the stability and reliability of the refrigeration device 100 under LC resonance effects.

[0046] In some embodiments, the magnetic ring 40 can be a ferrite ring. The magnetic ring 40 is made of ferrite material with high permeability and suitable high-frequency impedance characteristics, so that it presents a high impedance in the target frequency band, thereby effectively damping high-frequency common-mode interference.

[0047] In some embodiments, the outer side of the magnetic ring 40 is covered with an insulating layer to prevent short circuits. The insulating layer can be made of polymer materials such as polyurethane, epoxy resin, polypropylene, or polytetrafluoroethylene, which have good insulation properties and are heat- and corrosion-resistant. The insulating layer not only prevents short circuits but also provides some mechanical protection, mitigating damage to the magnetic ring 40 caused by friction or impact.

[0048] In some implementations, the refrigeration device 100 is a refrigerator.

[0049] Understandably, in order to verify whether the amplitude of the disturbance voltage resonant point has significantly decreased, this embodiment uses an EMC detection system 200 for detection, such as... Figure 4 As shown, the EMC testing system 200 includes a testing platform 202 and a testing device 201. The testing device 201 includes a test instrument LISN (Liquidity Stabilization Network), an EMI receiver, RF cables, and connectors. A cooling device 100 is located on the testing platform 202. The neutral wire 32 and live wire 31 of the cooling device 100 are connected to the LISN. The protective ground wire 33 of the cooling device 100 is connected to the metal floor 203 of the laboratory through the LISN, and a small magnetic ring 40 is threaded through the protective ground wire 33. First, in a shielded test field that meets the standard requirements, a non-conductive testing platform 202 is built, ensuring that the height of the testing platform 202 meets the standard requirements and that the test conditions meet the standards. The cooling device 100 is placed on the insulation testing platform 202, ensuring that the cooling device 100 is in a stable state. The cooling device 100 is connected to the power supply through the live wire 31, neutral wire 32, and protective ground wire 33 to the LISN, ensuring that the conducted interference test is performed in a stable impedance environment. The protective ground wire 33 is threaded with a magnetic ring 40 to ensure that high-frequency interference is effectively suppressed. Next, the instrument is calibrated using an EMI receiver to confirm that the LISN output and other measurement channel settings meet the test requirements. Then, the cooling device 100 is started under normal power supply to bring it into operation. The predetermined frequency range is scanned sequentially, and conducted interference signals are recorded. During the test, attention should be paid to whether abnormal resonance occurs (such as common-mode oscillation at 8MHz in the specific embodiment), and the effectiveness of the magnetic ring 40 in suppressing interference should be confirmed. The collected data is then analyzed to determine whether the radiated or conducted interference in each frequency band complies with the corresponding EMC standards. The test data is compared with standard limits to evaluate the electromagnetic compatibility of the cooling device 100, while recording and verifying the effectiveness of measures such as the magnetic ring 40 in suppressing high-frequency interference. Finally, a test report is compiled based on the test results, detailing the test steps, equipment configuration, environmental conditions, test data, and analysis conclusions, providing a basis for subsequent product optimization and certification.

[0050] Specifically, the testing platform 202 is an insulated platform designed to simulate the concrete layers inside a building.

[0051] Furthermore, the height of the testing platform 202 is within the range of 8cm to 16cm. By ensuring that the height of the testing platform 202 is within this range, the working environment of the refrigeration equipment 100 during actual installation and use can be simulated more realistically. In addition, indoors, concrete is poured on the reinforcing steel to form a concrete layer with a height between 8cm and 16cm. The refrigeration equipment 100 is installed on this concrete layer, separated from the metal floor 203 formed by the reinforcing steel by the concrete layer. Therefore, with the height of the testing platform 202 within this range, the usage environment can be better simulated, making the equivalent distributed capacitance 2021, equivalent distributed inductance 331, and their LC resonant characteristics closer to the actual usage environment, thereby obtaining more representative and reliable EMC disturbance voltage test results.

[0052] Understandably, when the refrigeration equipment 100 is installed in a bungalow or similar location without a reinforced concrete insulation layer, resonance will still occur, although the sharp resonance point of the interference voltage may be weaker. In this case, even if a magnetic ring 40 is fitted onto the protective grounding wire 33, it will not have any adverse effect on the normal operation of the refrigeration equipment 100. On the contrary, the magnetic ring 40 can still provide additional impedance and dissipation for high-frequency common-mode interference current, continuously suppressing the LC resonance formed by the equivalent distributed inductance 331 and the equivalent distributed capacitance 2021, thereby further optimizing the EMC performance of the equipment.

[0053] It is understandable that the test is conducted using a refrigerator as an example, from... Figure 5 As can be seen from the voltage test data graph of the refrigerator in the prior art, the resonant point at 8MHz (this is just a resonant point value for a specific embodiment of the refrigerator; it should be noted that different refrigeration devices 100 have different sizes, so the metal base plate and the metal ground form different equivalent distributed capacitances 2021, resulting in different resonant point values) is very sharp and the amplitude is unstable. However, from Figure 6 As can be seen from the voltage test data graph of this embodiment, the resonant point at 8MHz is completely suppressed. Therefore, it can be concluded that the sharp and highly unstable resonant point at 8MHz in the prior art test data is mainly due to the undamped LC resonant circuit formed between the protective grounding wire 33 and the metal ground. This embodiment, by having the protective grounding wire 33 pass through the magnetic ring 40, effectively dampes this LC resonant circuit, thereby completely suppressing the resonance phenomenon at 8MHz, resulting in a smooth and stable test data curve.

[0054] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A refrigeration appliance characterized in that, The application relates to a refrigeration device, which comprises: a device body; the device body is provided with a power line, the power line comprises a zero line, a fire line and a protective grounding line, the protective grounding line is connected with a metal shell of the device body, the device body can form an equivalent distributed capacitance with a metal ground, and the protective grounding line forms an equivalent distributed inductance; a magnetic ring is sleeved on the outer periphery of the protective grounding line.

2. The refrigeration appliance of claim 1, wherein, The magnetic ring is arranged in the device body.

3. The refrigeration appliance of claim 2, wherein, The device body comprises an electric control box, the magnetic ring is arranged in the electric control box, and the protective grounding line penetrates into the electric control box and is arranged separately from the fire line and the zero line.

4. The refrigeration appliance of claim 3, wherein, The electric control box is provided with a through hole, the part of the protective grounding line in the electric control box is provided with a bending structure, and the two ends of the bending structure are arranged in the through hole.

5. The refrigeration appliance of claim 1, wherein, The protective grounding line is arranged on the inner side and the outer side of the magnetic ring in sequence.

6. The refrigeration appliance of claim 1, wherein, The length of the magnetic ring is in the range of 7mm to 9mm along the length direction of the protective grounding line.

7. The refrigeration appliance of claim 6, wherein, The length of the magnetic ring is 8mm.

8. The refrigeration appliance of claim 1, wherein, The magnetic ring is a ferrite magnetic ring.

9. The refrigeration appliance of claim 1, wherein, The outer side of the magnetic ring is covered with an insulating layer.

10. The refrigeration appliance of any of claims 1-9, wherein, The refrigeration device is a refrigerator.

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