Microwave oven door detection structure and microwave oven

Abstract

The utility model provides a microwave oven door detection structure and microwave oven, including drawer subassembly, cavity and shell, wherein cavity sets up inside shell, drawer subassembly can be received or draw out relative to cavity, and drawer subassembly includes door body, inner layer board and outer layer board, and shell includes side plate, and inner layer board and outer layer board are separated through the side wall of cavity, and side plate also is parallel to the inner layer board and outer layer board of drawer subassembly, and outer layer board is opposite to the side plate of shell, and sets up infrared receiving module on one of outer layer board and same side side plate, and sets up infrared emission module on another, or sets up infrared receiving module on one of outer layer board, and sets up infrared emission module on another outer layer board. The infrared module is replaced for the microswitch, does not need to make big improvement to the existing drawer type microwave oven hardware structure, utilizes drawer type special structure to realize the receiving of infrared receiver to the infrared signal and judges whether the door is tightly closed or not, and the detection mode is reliable, and the anti -interference is strong.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and more specifically, to a microwave oven door detection structure and a microwave oven. Background Technology

[0002] The door assembly of a drawer-type microwave oven opens and closes via a push-pull operation. If it doesn't close tightly, microwave leakage may occur, affecting the oven's efficiency. Therefore, precise detection of the drawer's position is necessary. Previous door detection designs for drawer-type microwave ovens used two microswitches installed at both ends. For example, patent CN205026748U discloses a drawer-type microwave oven comprising: a body with an oven cavity, a first microswitch, a second microswitch, and a locking mechanism; a door at one end of the drawer, with a locking element and a limiting element on the drawer. The locking element is detachably abutted against the first microswitch, and the limiting element is detachably abutted against the second microswitch; a drawer drive mechanism connected to the drawer; and a controller connected to the drawer drive mechanism, the first microswitch, and the second microswitch. The controller monitors the state changes of the first and second microswitches to obtain the user's intent and controls the drawer drive mechanism to push the drawer forward or pull it out of the oven cavity.

[0003] However, mechanical control schemes often have the following problems: 1. Slow response speed: Due to the physical structure, the closing and opening of the switch requires a certain amount of time to operate; 2. Potential for switch sticking: Due to its miniaturized design, it is more susceptible to external interference, which can cause physical damage, or the number of uses may reach a certain limit, leading to device fatigue, resulting in a significant slowdown in response speed, or even sticking and abnormal response; 3. Potential debouncing problem: When microswitches are used in high-speed or repetitive driving applications, their switch contacts may bounce when closing or opening. If the switch closes frequently and quickly, it may cause instability or unexpected behavior in the circuit. Utility Model Content

[0004] In view of this, the present invention aims to provide a microwave oven door detection structure and a microwave oven to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A microwave oven door detection structure includes a drawer assembly, a cavity, and a housing. The cavity is disposed inside the housing. The drawer assembly is retractable or extendable relative to the cavity. The drawer assembly includes a door, an inner panel, and an outer panel. The housing includes side panels. The inner panel and the outer panel are separated by the side wall of the cavity. The side panels are parallel to the inner and outer panels of the drawer assembly. The outer panel is disposed opposite to the side panel of the housing. An infrared receiving module is disposed on one of the outer panel and the side panel on the same side, and an infrared emitting module is disposed on the other. Alternatively, an infrared receiving module is disposed on one of the outer panels, and an infrared emitting module is disposed on the other.

[0007] Furthermore, an infrared receiving module or an infrared emitting module is provided on the outer side of the outer layer plate, and an infrared emitting module or an infrared receiving module is provided on the inner side of the side plate of the outer shell. The infrared receiving module and the infrared emitting module are installed at the same horizontal line as the outer shell and the outer layers of the drawer on both sides.

[0008] Furthermore, taking the end closest to the door as the starting end and the end furthest from the door as the ending end, the infrared receiving module or infrared emitting module on the outer layer plate is positioned near the ending end of the outer layer plate.

[0009] Furthermore, an extension plate is provided at the rear end of the outer layer plate, with an infrared receiving module provided on one side of the extension plate and an infrared emitting module provided on the corresponding extension plate on the other side.

[0010] Furthermore, both the infrared receiving module and the infrared emitting module are mounted on the extension plates on both sides and are located infinitely close to the rear wall of the cavity.

[0011] Furthermore, a receiving space is formed between the rear wall of the cavity and the rear shell of the outer shell, and the extension plate extends through the rear wall of the cavity into the receiving space at the rear of the cavity, and the extension plate is integrally formed with the outer layer plate.

[0012] Furthermore, the extension plate is positioned near the upper part or near the lower part of the outer layer plate, or the upper and lower parts of the extension plate are flush with the upper and lower parts of the outer layer plate.

[0013] Furthermore, the infrared receiving module and the infrared transmitting module are installed on the same horizontal line.

[0014] Furthermore, the outer casing includes a front panel, wherein the front panel is arranged parallel to the door body, the front panel is used to seal the gap between the outer casing and the cavity, and the side panel is perpendicular to the front panel and parallel to the side wall of the cavity.

[0015] Compared with existing technologies, the microwave oven door detection structure of this utility model has the following advantages:

[0016] The design directly utilizes the existing drawer-type microwave oven structure, without requiring major modifications to the microwave oven's hardware. The only changes are replacing the existing microswitch with two main modules: an infrared transmitter and an infrared receiver. By leveraging the unique drawer-type structure of the microwave oven, the infrared receiver determines whether the door is closed by checking whether it receives infrared signals. This detection method is reliable, cost-effective, and has strong anti-interference capabilities.

[0017] This utility model also provides a microwave oven, including the microwave oven door detection structure described above.

[0018] The microwave oven described above has the same advantages over existing technologies as the microwave oven door detection structure, and will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a drawer-type microwave oven (drawer is in the open position).

[0020] Figure 2 This is an exploded view of a drawer-type microwave oven.

[0021] Figure 3 This is a schematic diagram of the microwave oven door detection structure according to Embodiment 1 of this utility model;

[0022] Figure 3a for Figure 3 A magnified view of the selected area;

[0023] Figure 4 This is a rear view of the microwave oven door detection structure described in Embodiment 1 of this utility model;

[0024] Figure 5 This is a bottom view of the microwave oven door detection structure according to Embodiment 1 of this utility model;

[0025] Figure 6 This is a schematic diagram of the microwave oven door detection structure described in Embodiment 2 of this utility model;

[0026] Figure 7 This is a bottom view of the microwave oven door detection structure described in Embodiment 2 of this utility model;

[0027] Figure 8 This is a cross-sectional view of the microwave oven door detection structure described in Embodiment 2 of this utility model;

[0028] Figure 9 This is a schematic diagram of the elongated extension plate disposed on the upper part of the outer layer plate according to Embodiment 2 of this utility model;

[0029] Figure 10This is a schematic diagram of the extension plate being set as a triangle according to Embodiment 2 of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Drawer assembly, 11-Door body, 12-Inner panel, 121-Roller assembly, 13-Outer panel, 131-Extension panel, 2-Cavity, 21-Side wall, 22-Rear wall, 3-Outer shell, 31-Side panel, 32-Rear shell, 33-Front panel, 41-Infrared receiving module, 42-Infrared transmitting module, 5-Accommodation space Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. In addition, the orientations involved in the following specific embodiments are briefly explained: the directions or positional relationships indicated by "front," "rear," "up," "down," "left," "right," "top," and "bottom" mentioned in the embodiments refer to the orientations or positional relationships shown in the accompanying drawings. The term "on..." means directly or indirectly supported by the... element.

[0033] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Example 1

[0035] like Figures 1-5 As shown, a microwave oven door detection structure includes a drawer assembly 1, a cavity 2, and a shell 3. The cavity 2 is located inside the shell 3 and is connected to the drawer assembly 1. The drawer assembly 1 is used to place food to be heated. The drawer assembly 1 can be retracted or pulled out relative to the cavity 2 to retrieve and place food. The drawer assembly 1 includes a door 11, an inner plate 12, and an outer plate 13. The door 11 is located on the front side of the drawer assembly 1 and is used to seal or open the opening of the cavity 2. The inner plate 12 and the outer plate 13 are both perpendicular to the door 11 and form the sides of the drawer assembly 1. Specifically, the inner plate 12 and the outer plate 13 are provided on the left and right sides of the drawer assembly 1. The inner plate 12 and the outer plate 13 are arranged in parallel and separated by the side wall 21 of the cavity 2, so that the inner plate 12 is located inside the cavity 2 and the outer plate 13 is located outside the cavity 2.

[0036] The outer casing 3 includes a side panel 31, a rear casing 32, and a front panel 33. The front panel 33 is arranged parallel to the door 11 and is used to seal the gap between the outer casing 3 and the cavity 2. The side panel 31 is perpendicular to the front panel 33 and parallel to the side wall 21 of the cavity 2. The side panel 31 is also parallel to the inner layer 12 and outer layer 13 of the drawer assembly 1. The outer layer 13 is arranged opposite to the side panel 31 of the outer casing 3. An infrared receiving module 41 or an infrared emitting module 42 is arranged on the outside of the outer layer 13. Correspondingly, an infrared emitting module 42 or an infrared receiving module 41 is arranged on the inside of the side panel 31 of the outer casing 3. The infrared receiving module 41 and the infrared emitting module 42 are installed at the same horizontal line as the outer casing and the outer layer of the drawer on both sides. Utilizing the properties of the rectilinear propagation of light and its extremely fast transmission speed, if the drawer assembly is not closed or is open, the infrared receiving module can react quickly and send the corresponding signal to realize the detection of the door.

[0037] This embodiment directly utilizes the existing drawer-type microwave oven structure, requiring no major modifications to the microwave oven's hardware. Only the existing microswitch is replaced with two main modules: an infrared transmitter and an infrared receiver. The unique drawer-type structure of the microwave oven allows the infrared receiver to determine whether the door is closed by receiving infrared signals. Infrared sensors are a typical non-contact control solution, providing no physical feedback and enabling rapid response. Even with frequent user operation, it avoids misjudgments, accurately detecting whether the door is tightly closed, ensuring the microwave oven can operate normally and stably for a long time. Furthermore, infrared module technology is currently very mature, offering high reliability and low cost. Compared to microswitches with ordinary physical structures, infrared modules have higher anti-interference capabilities. And because the infrared receiver receives a specific carrier frequency band, it has excellent anti-interference capabilities against various light sources in the environment.

[0038] In this embodiment, a roller assembly 121 is provided on the outer side of the inner layer plate 12. The roller assembly 121 is also located inside the cavity 2. The roller assembly 121 is used to enable the drawer assembly 1 to enter and exit relative to the cavity 2.

[0039] The outer plate 13 is made of metal and is placed on the outside of the cavity 2, which can effectively avoid interference from microwaves, water vapor and other factors.

[0040] Furthermore, with the end closest to the door 11 as the starting point and the end furthest from the door 11 as the ending point, the infrared receiving module 41 or infrared emitting module 42 on the outer plate 13 is positioned near the end of the outer plate 13 to prevent the infrared module from being exposed to the outside environment and contaminated when the drawer assembly 1 is opened.

[0041] There is a certain distance between the rear wall 22 of the cavity 2 and the rear shell 32 of the outer shell 3, forming an accommodating space 5. The outer layer plate 13 can be configured to be the same length as the inner layer plate 12, or the outer layer plate 13 can be extended to the rear side to a length greater than that of the inner layer plate 12.

[0042] Because the infrared transmitter and receiver are on the same horizontal line, and one type of sensor is fixed to the outer casing and does not move with the drawer, while the other sensor moves with the drawer, if the user pulls the drawer or otherwise fails to align the infrared receiver and transmitter on the same horizontal line, the infrared receiver will not detect the infrared signal and will not send a corresponding "door not closed" signal to the control board. Conversely, the infrared receiver will only receive the infrared signal and send a corresponding "door closed" signal to the control board if and only if the infrared transmitter and receiver are aligned on the same horizontal line.

[0043] Example 2

[0044] This embodiment improves upon the structure of the outer layer 13 based on Embodiment 1. Under the condition that there is no conflict, the other structures in this embodiment are the same as those in Embodiment 1.

[0045] like Figures 1-2 and Figures 6-10 As shown, in this embodiment, the outer plate 13 is configured as a rearward extending structure, that is, an extension plate 131 is provided at the rear end of the outer plate 13. The extension plate 131 continues to extend rearward based on the outer plate 13 and is located inside the accommodating space 5. An opening is made in the rear wall of the cavity 2 at the corresponding position, and the extension plate 131 extends through the rear wall 22 of the cavity 2 into the accommodating space at the rear of the cavity. At this time, under the condition that both sides are unobstructed and on the same horizontal line, an infrared receiving module 41 is provided on one side of the extension plate 131, and an infrared emitting module 42 is provided on the corresponding other side of the extension plate 131. Both the infrared receiving module 41 and the infrared emitting module 42 are located on the extension plates 131 on both sides and are infinitely close to the rear wall of the cavity 2.

[0046] The extension plate 131 is integrally formed with the outer plate 13. The shape of the extension plate 131 projected onto the side plate 31 can be a strip, a triangle, or other irregular shape, as long as it can provide installation space for the infrared absorption and infrared emission modules. Furthermore, the extension plate 131 can also be positioned near the upper part or near the lower part of the outer plate 13, or the extension plate 131 can be flush with the upper and lower parts of the outer plate.

[0047] In this embodiment, the existing drawer structure is directly modified to make full use of the large space at the rear of the cavity. The outer layers on both sides of the drawer are extended according to actual needs, and openings are made at the corresponding positions at the rear of the cavity to extend it to the rear of the cavity. At this time, under the condition that the two sides can be unobstructed and on the same horizontal line, the infrared emitting module and the infrared receiving module can be installed on the outer metal parts of the two sides of the drawer and infinitely close to the rear of the cavity. The infrared emitting module and the infrared receiving module fixed on the extension plate will move with the drawer. However, since the cavity is fixed, the two sides of the drawer will be isolated by the cavity when it is pulled, so that the infrared receiving module on one side cannot receive the infrared signal emitted by the infrared emitting module on the other side, thereby sending the corresponding "door not closed" signal to the computer board. Conversely, the infrared receiving module can only receive the infrared signal and send the corresponding "door closed" signal to the computer board when the infrared emitting module and the infrared receiving module are on the same horizontal line. However, this solution requires that the installation position of the infrared emitting module and the infrared receiving module be infinitely close to the rear of the cavity.

[0048] 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 microwave oven door detection structure, comprising a drawer assembly (1), a cavity (2), and a shell (3), wherein the cavity (2) is disposed inside the shell (3), the drawer assembly (1) is retractable or pull-out relative to the cavity (2), the drawer assembly (1) includes a door (11), an inner layer (12), and an outer layer (13), the shell (3) includes a side panel (31), the inner layer (12) and the outer layer (13) are separated by a side wall (21) of the cavity (2), the side panel (31) is also parallel to the inner layer (12) and the outer layer (13) of the drawer assembly (1), and the outer layer (13) is disposed opposite to the side panel (31) of the shell (3), characterized in that, An infrared receiving module (41) is provided on one of the outer plate (13) and the side plate (31) on the same side, and an infrared emitting module (42) is provided on the other; or an infrared receiving module is provided on one of the outer plates (13) and an infrared emitting module is provided on the other outer plate (13).

2. The microwave oven door detection structure according to claim 1, characterized in that, An infrared receiving module (41) or an infrared emitting module (42) is provided on the outer side of the outer plate (13), and an infrared emitting module (42) or an infrared receiving module (41) is provided on the inner side of the side plate (31) of the outer shell (3). The infrared receiving module (41) and the infrared emitting module (42) are installed on the same horizontal line as the outer shell (3) and the outer plate (13).

3. The microwave oven door detection structure according to claim 2, characterized in that, With the end closest to the door (11) as the starting end and the end furthest from the door (11) as the ending end, the infrared receiving module (41) or infrared emitting module (42) on the outer plate (13) is located near the end of the outer plate (13).

4. The microwave oven door detection structure according to claim 1, characterized in that, An extension plate (131) is provided at the rear end of the outer plate (13). An infrared receiving module (41) is provided on one side of the extension plate (131), and an infrared emitting module (42) is provided on the corresponding other side of the extension plate (131).

5. The microwave oven door detection structure according to claim 4, characterized in that, The infrared receiving module (41) and the infrared emitting module (42) are both located on the extension plates (131) on both sides and are infinitely close to the rear wall (22) of the cavity (2).

6. The microwave oven door detection structure according to claim 5, characterized in that, A receiving space (5) is formed between the rear wall (22) of the cavity (2) and the rear shell (32) of the outer shell (3). The extension plate (131) extends through the rear wall (22) of the cavity (2) into the receiving space at the rear of the cavity (2). The extension plate (131) is integrally formed with the outer plate (13).

7. The microwave oven door detection structure according to claim 4, characterized in that, The extension plate (131) is located near the upper part or near the lower part of the outer layer plate (13), or the extension plate (131) is flush with the upper and lower parts of the outer layer plate (13).

8. The microwave oven door detection structure according to claim 4, characterized in that, The infrared receiving module (41) and the infrared transmitting module (42) are installed on the same horizontal line.

9. The microwave oven door detection structure according to claim 1, characterized in that, The outer shell (3) includes a front panel (33), wherein the front panel (33) is arranged parallel to the door (11), the front panel (33) is used to seal the gap between the outer shell (3) and the cavity (2), and the side panel (31) is perpendicular to the front panel (33) and parallel to the side wall (21) of the cavity (2).

10. A microwave oven, characterized in that, Includes the microwave oven door detection structure as described in any one of claims 1 to 9.

Images