Power line fixing structure and microwave oven

Abstract

The utility model provides a power cord fixing structure and microwave oven, the microwave oven comprises a shell, the power cord fixing structure comprises a protective part used for protecting a power cord, the power cord comprises a first end and a second end which respectively extend along a first direction and a second direction, the first end and the second end are both located on the protective part, and the protective part is used for protecting the power cord. And the protection piece is detachably connected with the shell. According to the power line fixing structure and the microwave oven disclosed by the utility model, the protection piece has the functions of fixing, bending resistance and pulling resistance when the power line penetrates out of the shell, and the protection piece is directly and detachably connected with the shell without additionally arranging independent parts such as a cover plate and a screw, so that the number of parts is greatly reduced, and the manufacturing cost is reduced; the two ends of the power line are vertically distributed in the protection piece, so that the problem of stress concentration caused by single-point bending when a traditional straight line penetrates out is avoided, the power line is effectively prevented from being broken due to frequent bending, and the power line is particularly suitable for an embedded microwave oven.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically, to a power cord fixing structure and a microwave oven. Background Technology

[0002] Microwave ovens use high-frequency microwaves emitted by a magnetron to act on water molecules in food. The heat generated by the high-speed movement and friction of the water molecules is used to quickly heat the food, making it an indispensable cooking appliance in modern households.

[0003] For microwave ovens, the power cord needs to pass through the casing and connect to the internal components to deliver power. Most existing power cords are routed from the top or rear of the oven. If the power cord were to pass directly through a hole at the rear, it would not only be prone to wobbling but could also pull on the internal components during use, affecting the microwave oven's reliability.

[0004] To address this, Chinese patent CN1222726C proposes a design where the power cord is routed through an opening on the top panel of the oven body, and assembly is achieved using a detachable cover and screws. While this solution avoids direct contact between the power cord and the bottom heat source, it requires additional components such as a cover, fasteners, and screws, leading to increased structural complexity and assembly steps, significantly raising manufacturing costs. Furthermore, frequent passive bending of the power cord after it exits the oven body can easily cause breakage or other abnormalities, especially for built-in microwave ovens.

[0005] In view of the above, this utility model is hereby proposed. Utility Model Content

[0006] The problem solved by this utility model is that the existing power cord protrusion structure is unreasonable, which is not only cumbersome to assemble but also has poor reliability.

[0007] To address the aforementioned problems, this utility model provides a power cord fixing structure for a microwave oven. The microwave oven includes a housing, and the power cord fixing structure includes a protective component for protecting the power cord. The power cord includes a first end and a second end extending along a first direction and a second direction, respectively. Both the first end and the second end are located within the protective component, and the protective component is detachably connected to the housing.

[0008] In this application, the protective component simultaneously serves to fix the power cord, resist bending, and prevent pulling, eliminating the need for additional cover plates, screws, or other independent parts, significantly reducing the number of parts and lowering manufacturing costs. Furthermore, the direct detachable connection between the protective component and the housing simplifies the assembly process, improves production efficiency, and facilitates later maintenance or power cord replacement. The first direction and the second direction form a certain angle, for example, 80-120°, preferably 90°.

[0009] Preferably, the first direction and the second direction are arranged perpendicular to each other, and the protective component is assembled with the housing by plugging and screwing.

[0010] This design allows for pre-positioning of the protective component and the housing via a plug-in structure, eliminating the need for precise alignment of threaded holes and simplifying assembly steps. This is particularly suitable for automated production lines, improving assembly efficiency. Furthermore, screws reinforce key stress points, preventing the risk of loosening due to vibration that can occur with simple plug-ins. Additionally, the protective component enables a vertical layout of the power cord at both ends; the first end (external lead) and the second end (internal connection) of the power cord are vertically or nearly vertically distributed within the protective component. This avoids stress concentration issues caused by single-point bending when the cord passes through a straight section, effectively preventing breakage due to frequent bending. This is especially suitable for built-in microwave ovens, where the first end of the power cord can be smoothly laid along the housing surface, preventing cable damage caused by excessive bending or compression during installation.

[0011] Preferably, the housing includes a rear side plate, a portion of which protrudes rearward to form a first mounting platform, and a portion of the first mounting platform protrudes rearward to form a second mounting platform, wherein the protective component is positioned on the first mounting platform.

[0012] This design causes the first and second mounting platforms to protrude in stages, forming a stepped space. This physically isolates the power cord's routing path outside the casing from other components inside the microwave oven, preventing the cable from coming into contact with high-temperature or moving parts. It also optimizes the utilization of internal space. Confining the protective components to the first mounting platform does not increase the thickness of the microwave oven, which is conducive to achieving a compact layout.

[0013] Preferably, the protective component includes a body, a limiter is provided at one end of the body, a plug block is provided on one side of the body, the second end of the power cord is led out from the plug block, the first end of the power cord is led out from the limiter, the first mounting platform of the housing is provided with a socket, and the plug block is limited and assembled into the socket.

[0014] This setup enables blind-plug installation without the need for manual fine-tuning, improving assembly efficiency and making it particularly suitable for automated production lines. The second end of the power cord is led out from inside the plug block, and the rigid structure of the plug block provides bending protection for the cable root, avoiding repeated bending fatigue fracture caused by the cable being directly suspended in the air at the traditional opening. The plug block is embedded in the socket of the first mounting platform, preventing protruding cables from affecting the compactness of the microwave oven's wall mounting.

[0015] Preferably, the limiter is provided with multiple spacer slots along the extension direction of the power cord. This arrangement can divide the extension path of the power cord into multiple independent fixed areas, avoiding stress concentration at a single point of bending and reducing the risk of fatigue fracture of the cable due to repeated bending; at the same time, the protrusions between the spacer slots form an elastic clamp on the power cord, allowing the cable to move slightly during thermal expansion and contraction or vibration, while maintaining overall fixation.

[0016] Preferably, the body has a first inclined surface on the side away from the limiter, and the first inclined surface is recessed towards the plug block to form a recessed portion. An assembly hole is provided on the recessed portion, and the first mounting platform of the housing is provided with an mounting hole. The mounting hole and the assembly hole are connected by screws.

[0017] This design uses screws to rigidly lock the assembly holes and mounting holes, and forms a double fixation of "plug-in + screw connection" with the limiting assembly of the plug-in block, which significantly improves the vibration resistance and tensile strength. The recessed design allows the screws to sink below the surface of the protective part, preventing the screws from loosening or falling off due to external collisions. It will not affect the wall mounting of the microwave oven or its fit with the cabinet, making the overall structure more aesthetically pleasing.

[0018] Preferably, an opening groove is provided between the body and the plug-in block, the opening groove is located at one end of the body near the limiter, and the bottom wall of the opening groove abuts against the upper edge of the plug hole.

[0019] This design uses the bottom wall of the slot to abut against the upper edge of the socket to limit the upper part of the protective component in both left and right and front and back dimensions. At the same time, it works with the assembly hole and mounting hole to limit the lower part of the protective component, ensuring that the power cord lead-out end is precisely aligned with the preset position of the housing.

[0020] This utility model also provides a microwave oven, including the power cord fixing structure described above.

[0021] Preferably, the microwave oven further includes a heating cavity, with a first magnetron and a second magnetron disposed below the bottom of the heating cavity. Microwaves generated by the first and second magnetrons enter the heating cavity from the bottom and rear, respectively, to cook food. This arrangement ensures high-power continuous heating of food through the alternating operation of the first and second magnetrons, even in scenarios with limited input power. Preferably, the microwave oven is an embedded microwave oven.

[0022] Compared with the prior art, the power cord fixing structure and microwave oven described in this utility model embodiment have the following beneficial effects: 1) It protects the power cord when it passes through the outer shell, providing fixing, anti-bending, and anti-pull functions. The protective component is directly and detachably connected to the shell, eliminating the need for additional cover plates, screws, or other independent components, significantly reducing the number of parts and lowering manufacturing costs; 2) The two ends of the power cord are located within the protective component and are vertically distributed, avoiding the stress concentration problem caused by single-point bending when the cord passes through in a straight line in the traditional way. This effectively prevents the power cord from breaking due to frequent bending, making it especially suitable for built-in microwave ovens; 3) The bottom wall of the opening groove abuts against the upper edge of the insertion hole to limit the upper part of the protective component in both left and right and front and back dimensions. At the same time, it cooperates with the assembly hole and mounting hole to limit the lower part of the protective component, ensuring that the lead-out end of the power cord is precisely aligned with the preset position of the shell. Attached Figure Description

[0023] Figure 1 This is an overall schematic diagram of the microwave oven described in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the rear side plate according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the protective component described in an embodiment of this utility model;

[0026] Figure 4 This is another perspective view of the protective component described in an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Housing; 11-Rear panel; 111-First mounting platform; 112-Second mounting platform; 113-Insertion hole; 114-Mounting hole; 12-Base; 2-Protective component; 21-Body; 211-Recess; 212-First inclined surface; 213-Assembly hole; 22-Insertion block; 23-Limiter; 231-Gap groove; 24-Opening groove; 3-Power cord; 31-First end; 32-Second end. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Without conflict, the technical features of the embodiments of this utility model can be combined with each other.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] Microwave ovens, as common household appliances, are popular due to their convenience, speed, and ease of operation. Traditional microwave ovens typically have their power cords extended in the same direction from the rear panel 11 of the casing 1. For built-in microwave ovens, this power cord is often passively bent at a 90-degree angle to bring the microwave oven as close as possible to the rear wall of the mounting cavity. This can exert stress on the power cord's extension structure, potentially reducing its assembly reliability and affecting the lifespan of the power cord itself. Therefore, the applicant proposes the following technical solution:

[0033] like Figure 1-4 As shown, a power cord fixing structure is used for a microwave oven. The microwave oven includes a housing 1. The power cord fixing structure includes a protective member 2 for protecting the power cord 3. The power cord 3 includes a first end 31 and a second end 32 extending along a first direction and a second direction, respectively. The first end 31 and the second end 32 are both located inside the protective member 2. The protective member 2 is detachably connected to the housing 1.

[0034] In this application, the protective component 2 simultaneously serves to fix the power cord 3, resist bending, and prevent pulling. It eliminates the need for additional independent components such as cover plates and screws, significantly reducing the number of parts and lowering manufacturing costs. At the same time, the direct and detachable connection between the protective component 2 and the housing 1 simplifies the assembly process, improves production efficiency, and facilitates later maintenance or replacement of the power cord 3. Furthermore, the protective component 2 enables the power cord 3 to be arranged vertically at both ends, that is, the first end 31 (external lead-out end) and the second end 32 (internal connection end) of the power cord 3 are vertically distributed within the protective component 2. This avoids the stress concentration problem caused by single-point bending when the power cord passes through a straight line in the traditional way, effectively preventing the power cord 3 from breaking due to frequent bending. This is especially suitable for built-in microwave ovens, as the first end 31 of the power cord 3 can be smoothly laid along the surface of the housing 1, avoiding cable damage caused by excessive bending or squeezing during installation.

[0035] As an example of this utility model, the protective component 2 is assembled with the housing 1 via a plug-in connection and a screw connection. This arrangement allows for pre-positioning of the protective component 2 and the housing 1 through the plug-in structure, eliminating the need for precise alignment of the threaded holes, simplifying the assembly process, and is particularly suitable for automated production lines, improving assembly efficiency. Furthermore, screws are used to reinforce key stress points, avoiding the risk of vibration-induced loosening that may occur with simple plug-in connections.

[0036] As an example of this utility model, the housing 1 includes a rear side plate 11, a portion of the rear side plate 11 protruding rearward to form a first mounting platform 111, a portion of the first mounting platform 111 protruding rearward to form a second mounting platform 112, and the protective member 2 being positioned and mounted on the first mounting platform 111.

[0037] This design causes the first mounting platform 111 and the second mounting platform 112 to protrude in stages, forming a stepped space. This physically isolates the power cord 3 from other components inside the microwave oven, preventing the cable from coming into contact with high-temperature or moving parts, while also optimizing the utilization of internal space. Confining the protective component 2 to the first mounting platform 111 does not increase the thickness of the microwave oven, which is conducive to achieving a compact layout.

[0038] As an example of this utility model, the protective component 2 includes a body 21, a limiter 23 is provided at one end of the body 21, a plug block 22 is provided on one side of the body 21, the second end 32 of the power cord 3 is led out from the plug block 22, the first end 31 of the power cord 3 is led out from the limiter 23, the first mounting platform 111 is provided with a socket 113, and the plug block 22 is limited and assembled into the socket 113.

[0039] This setup enables blind-plug installation without the need for fine manual adjustments, improving assembly efficiency and making it particularly suitable for automated production lines. The second end 32 of the power cord 3 is led out from inside the plug block 22. The rigid structure of the plug block 22 provides bending protection for the cable root, avoiding repeated bending fatigue fracture caused by the cable being directly suspended at the traditional opening. The plug block 22 is embedded in the socket 113 of the first mounting platform 111, preventing the protruding cable from affecting the compactness of the microwave oven's wall mounting.

[0040] The cross-sectional shape of the plug block 22 matches the shape of the socket 113, such as a square, rectangle, or circle. Preferably, the limiter 23 has multiple spacer slots 231 along the extension direction of the power line 3. This arrangement divides the extension path of the power line 3 into multiple independent fixed areas, avoiding stress concentration at a single point of bending and reducing the risk of fatigue fracture caused by repeated bending of the cable; at the same time, the protrusions between the spacer slots 231 form an elastic clamping effect on the power line 3, allowing the cable to move slightly during thermal expansion and contraction or vibration, while maintaining overall fixation.

[0041] Preferably, the body 21 has a first inclined surface 212 on the side away from the limiter 23, and the first inclined surface 212 is recessed towards the plug block 22 to form a recessed portion 211. The recessed portion 211 is provided with an assembly hole 213, and the first mounting platform 111 is provided with an assembly hole 114. The assembly hole 114 and the assembly hole 213 are connected by screws.

[0042] This setup achieves rigid locking between the assembly hole 213 and the mounting hole 114 via screws, and forms a double fixation of "plug-in + screw connection" with the limiting assembly of the plug-in block 22, significantly improving vibration resistance and tensile strength; while the design of the recessed part 211 allows the screws to sink below the surface of the protective part 2, preventing the screws from loosening or falling off due to external collisions, and will not affect the wall mounting of the microwave oven or its fit with the cabinet, making the overall structure more aesthetically pleasing.

[0043] Preferably, an opening groove 24 is provided between the body 21 and the plug block 22. The opening groove 24 is located at the end of the body 21 near the limiter 23, and the bottom of the opening groove 24 abuts against the upper edge of the plug hole 113. This arrangement can limit the upper part of the protective member 2 in both left and right and front and back dimensions by using the bottom wall of the opening groove 24 abutting against the upper edge of the plug hole 113. At the same time, it cooperates with the mounting hole 213 and the mounting hole 114 to limit the lower part of the protective member 2, ensuring that the lead end of the power cord 3 is accurately aligned with the preset position of the housing 1.

[0044] During assembly, insert the plug block 22 of the protective component 2 into the socket 113, and then push the protective component 2 upward along the outer side wall of the housing 1 to limit the socket 113 into the opening groove 24. At this time, the upper edge of the socket 113 abuts against the bottom of the opening groove 24, thereby preventing the protective component 2 from shaking to the left and right and / or back and forth. At the same time, the mounting hole 213 aligns with the mounting hole 114, and the two are fixedly connected by screws. The protective component 2 makes the first end 31 of the power cord 3 perpendicular to the second end 32, so that the external lead end, i.e. the first end 31, is smoothly laid along the surface of the housing 1, avoiding damage to the cable of the microwave oven, especially the built-in microwave oven, due to excessive bending or squeezing during installation.

[0045] This utility model also provides a microwave oven, including the aforementioned power cord fixing structure. The microwave oven further includes a base 12 and a heating cavity. The heating cavity has a first magnetron and a second magnetron disposed on one side near the base 12. This arrangement ensures that, even in scenarios with limited input power, high-power continuous heating of food can be achieved through the alternating operation of the first and second magnetrons.

[0046] Preferably, the microwave oven further includes a heating assembly, which includes a heating element located above the bottom of the heating cavity. This configuration enables the microwave oven's grilling function, enriching its application scenarios.

[0047] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A power cord fixing structure for a microwave oven, the microwave oven including a housing (1), characterized by, The power line fixing structure comprises a protection piece (2) for protecting a power line (3), the power line (3) comprising a first end (31) and a second end (32) extending along a first direction and a second direction respectively, the first end (31) and the second end (32) being located in the protection piece (2), and the protection piece (2) being detachably connected with the shell (1).

2. The power cord securing structure of claim 1, wherein The first direction and the second direction are arranged perpendicularly to each other, and the protection piece (2) is assembled with the shell (1) through insertion and screwing.

3. The power cord fixing structure according to claim 1 or 2, characterized in that, The shell (1) comprises a rear side plate (11) which is partially protruded rearward to form a first mounting table (111), the first mounting table (111) is partially protruded rearward to form a second mounting table (112), and the protection piece (2) is limitingly arranged on the first mounting table (111).

4. The power cord securing structure according to claim 1 or 2, characterized by The protection piece (2) comprises a body (21), one end of the body (21) is provided with a limiting piece (23), one side of the body (21) is provided with an insertion block (22), the second end (32) of the power line (3) is led out from the insertion block (22), the first end (31) of the power line (3) is led out from the limiting piece (23), and the first mounting table (111) of the shell (1) is provided with a insertion hole (113), and the insertion block (22) is limitingly arranged in the insertion hole (113).

5. The power cord securing structure of claim 4, wherein A plurality of interval grooves (231) are arranged on the limiting piece (23) along the extension direction of the power line (3).

6. The power cord securing structure of claim 4, wherein The body (21) has a first inclined surface (212) on the side away from the limiting piece (23), the first inclined surface (212) is partially recessed to the side of the insertion block (22) to form a recessed portion (211), the recessed portion (211) is provided with an assembly hole (213), the first mounting table (111) of the shell (1) is provided with a mounting hole (114), and the mounting hole (114) is connected with the assembly hole (213) through a screw.

7. The power cord securing structure of claim 6, wherein An opening groove (24) is arranged between the body (21) and the insertion block (22), the opening groove (24) is located at one end of the body (21) close to the limiting piece (23), and the bottom wall surface of the opening groove (24) abuts against the upper edge of the insertion hole (113).

8. A microwave oven characterized by comprising: The power line fixing structure comprises a protection piece (2) for protecting a power line (3), the power line (3) comprising a first end (31) and a second end (32) extending along a first direction and a second direction respectively, the first end (31) and the second end (32) being located in the protection piece (2), and the protection piece (2) being detachably connected with the shell (1).

9. The microwave oven as claimed in claim 8, wherein The microwave oven further comprises a heating cavity, a first magnetron and a second magnetron are arranged below the bottom of the heating cavity, and microwaves generated by the first magnetron and the second magnetron enter the heating cavity from the bottom and the rear side respectively to cook food.

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