Anti-dry burning control assembly with human sensing function, control device and cooktop

Abstract

The utility model relates to a range technology field, especially a kind of dry-burning-preventing control assembly with human-sensing detection function, control device and range, dry-burning-preventing control assembly includes control module and radar module, control module includes control PCB board and the controller of being located at control PCB board, radar module includes radar PCB board and mounting bracket, radar PCB board is electrically connected with control PCB board, radar PCB board is located on mounting bracket, to be detachably connected with control PCB board by mounting bracket;The top of radar PCB board extends to the position above the center of control PCB board, to make the plane where radar PCB board is located and the plane where control PCB board is located intersect arrangement, radar antenna and radar processor are equipped on radar PCB board, radar antenna is arranged on the upper surface of radar PCB board, and located the position of near top edge of the upper surface, to realize human-sensing monitoring to the range nearby, so that control module realizes the takeover of range, improves the user's use experience.

Description

Technical Field

[0001] This utility model relates to the field of stove technology, and in particular to an anti-dry-burning control component, control device and stove with human detection function. Background Technology

[0002] When cooking food on a stove, if the user is not nearby, meaning the stove is in unattended use, issues such as dry burning or overflowing cannot be addressed promptly. Therefore, a new type of stove on the market utilizes human body detection technology (referred to as "human detection") to automatically shut off the stove or implement anti-dry burning controls when no one is detected in front of it, thus enabling the stove to take over autonomously.

[0003] To achieve human detection, related technologies use infrared sensors, placing infrared emitters and receivers within the cooktop. The emitter emits infrared light, and the receiver detects the reflected infrared light from a person to identify whether someone is in front of the cooktop, thus enabling the cooktop to operate autonomously. However, infrared sensors are relatively large and susceptible to interference from ambient light, oil stains, or other obstructions, resulting in poor detection accuracy and impacting the user experience. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology in which the use of infrared sensors to detect human presence in stoves results in poor detection accuracy and affects the user experience, and to provide a solution.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] In a first aspect, this utility model provides an anti-dry-burning control component with human detection function, comprising a control module and a radar module. The control module includes a control PCB board and a controller, the controller being disposed on the control PCB board. The radar module includes a radar PCB board and a mounting bracket. The radar PCB board is electrically connected to the control PCB board and is disposed on the mounting bracket. The radar PCB board is detachably connected to the control PCB board through the mounting bracket. The top of the radar PCB board extends to a position above the center of the control PCB board, such that the plane on which the radar PCB board is located intersects with the plane on which the control PCB board is located. The radar PCB board is provided with a radar antenna and a radar processor. The radar antenna is disposed on the upper surface of the radar PCB board and is located near the top edge of the upper surface.

[0007] The anti-dry-burning control component provided by this utility model includes a radar module and a mounting bracket. The radar module includes a radar PCB board, a radar antenna, and a radar processor. The radar PCB board is electrically connected to a control PCB board. The mounting bracket is connected to the control PCB board of the control module to ensure the radar module is reliably fixed relative to the control module. Thus, the anti-dry-burning control component provided by this utility model can use the radar antenna to sense and monitor the presence of people near the stove, thereby identifying whether someone is near the stove. This information is then sent to the control module, allowing the control module to take over control of the stove and ensure it remains in normal working order. This ensures normal operation of the stove even when the user leaves its vicinity, improving the user experience. Furthermore, the radar PCB board is intersecting with the control PCB board, meaning it is tilted relative to the control PCB board, and the radar antenna is located near the top edge of the radar PCB board. This allows the radar antenna to be positioned as far away from the control PCB board as possible and closer to the outside of the stove, resulting in a larger detection area.

[0008] Preferably, the plane on which the radar PCB board is located forms an angle with the plane on which the control PCB board is located, and the angle is 30°-45°.

[0009] This configuration allows the radar PCB board to have a better spatial detection range, thereby further improving the signal transmission and reception performance of the radar module.

[0010] Preferably, the radar antenna has a length of 8 mm to 12 mm along the longitudinal direction of the radar PCB board. This arrangement effectively reduces the height of the sensor, and the radar antenna is positioned near the upper edge of the sensor so that it is closer to the glass and less likely to be obstructed by the metal casing of the stove's control device.

[0011] Preferably, the radar module is disposed on the bottom edge portion of the control PCB board and located at the middle position of the bottom edge portion, so as to minimize interference from other metal components on the control PCB board to the radar antenna.

[0012] Preferably, the radar module further includes a communication connector comprising a plurality of connection pins. The two ends of each connection pin are connected to the control PCB board and the radar PCB board, respectively, so that the radar PCB board and the control PCB board are electrically connected via the connection pins. This configuration, where the control PCB board and the radar PCB board are connected by the connection pin structure and electrically, ensures the connection effect between the control PCB board and the radar PCB board and the reliability of signal transmission.

[0013] Secondly, the present invention provides a control device, which includes a housing and an anti-dry-burning control component as described above; a receiving cavity is formed inside the housing, and the anti-dry-burning control component is located inside the receiving cavity.

[0014] The control device provided by this utility model has the same beneficial effects as the above-mentioned anti-dry burning control component, and will not be described again here.

[0015] Preferably, the housing includes a housing body and a cover plate. The housing body has a mounting groove with a top opening, and the cover plate covers the top opening to form the receiving cavity together with the housing body. The cover plate has a clearance opening corresponding to the position of the anti-dry-burning control component, allowing the radar PCB board to be exposed through the clearance opening. This arrangement encloses the anti-dry-burning control component inside the control device, thus providing a certain degree of protection for it.

[0016] Preferably, the housing body includes a base plate and a front side plate. The front side plate is connected to the front edge of the base plate and extends upward in a direction perpendicular to the base plate. A mounting gap is formed between the radar PCB board and the front side plate, and the lateral dimension of the mounting gap is 10mm-15mm. This arrangement can maximize the utilization of internal space of the control device while ensuring the signal transmission and reception performance of the radar module.

[0017] Thirdly, this utility model provides a stove, which includes the control device as described above; the stove includes a metal chassis and a glass panel, the metal chassis has a mounting groove with a top opening, the control device is disposed in the mounting groove, and the glass panel covers the top opening to close the mounting groove.

[0018] The stove provided by this utility model has the same beneficial effects as the aforementioned anti-dry-burning control components and control devices, and will not be described again here.

[0019] Preferably, the glass panel has an explosion-proof area and a signal avoidance area, and a metal mesh is embedded inside the glass panel. The metal mesh is located within the explosion-proof area, and the radar module is located directly below the signal avoidance area to avoid affecting the normal operation of the radar module.

[0020] Preferably, the control device is located in the inner cavity of the stove near the bottom edge of the metal chassis, and an installation gap is formed between the center point of the anti-dry burning control component and the bottom edge of the water inlet chassis. The lateral dimension of the installation gap is not less than 25mm, so as to avoid the lower edge of the chassis from shielding the radar signal.

[0021] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model. Attached Figure Description

[0022] Figure 1 A schematic diagram of the control device provided in an embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the human touch detection device provided in an embodiment of the present invention.

[0024] Figure 3 A schematic diagram of the radar module and mounting bracket of the human detection device provided in this embodiment of the utility model.

[0025] Figure 4 A schematic diagram of the mounting bracket for the human sensory detection device provided in this embodiment of the utility model.

[0026] Figure 5 A schematic diagram of the communication connector of the radar module of the human detection device provided in this embodiment of the utility model.

[0027] Figure 6 This is a schematic diagram showing the installation position between the human detection device and the control device provided in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Human detection device; 1. Radar module; 11. Radar PCB board; 111. First socket; 12. Radar antenna; 13. Communication connector; 131. Connector board; 132. Connecting pin; 2. Mounting bracket; 21. Bracket base; 22. Lateral limiting component; 23. Limiting groove; 4. Connector;

[0030] 20. Control PCB board;

[0031] 100. Control device; 101. Housing; 1011. Clearance opening; 1012. Housing body; 10121. Front side panel; 1013. Cover plate. Detailed Implementation

[0032] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0033] Example 1

[0034] like Figure 1-6As shown, this embodiment of the present invention provides an anti-dry-burning control component with human detection function, which includes a control module and a radar module 1. The control module includes a control PCB board 20 and a controller, with the controller mounted on the control PCB board 20. The radar module 1 includes a radar PCB board 11 and a mounting bracket 2, with the radar PCB board 11 mounted on the mounting bracket 2 and detachably connected to the control PCB board 20 via the mounting bracket 2. Furthermore, the radar PCB board 11 is equipped with a radar antenna 12 and a radar processor.

[0035] Specifically, the controller can be fixed to the control PCB board 20 using soldering or surface mount technology. Correspondingly, the radar processor can also be mounted on the radar PCB board 11 using the same technology. Furthermore, it should be noted that the aforementioned "PCB board" specifically refers to a Printed Circuit Board, which is a substrate used to support and connect electronic components. In this embodiment, both the control PCB board 20 and the radar PCB board 11 serve as substrates for the control module and radar module 1, respectively, for mounting corresponding components and implementing functions.

[0036] In practical implementation, the radar antenna 12 on the radar PCB board 11 is electrically connected to the radar processor. The radar antenna 12 is used to transmit radio frequency signals and receive echo signals reflected from the target. The radar processor executes algorithms based on the echo signals received by the radar antenna 12 to obtain information such as distance, speed, or angle. Furthermore, the information obtained by the radar processor can be transmitted to the controller on the control PCB board 20, enabling the controller to perform corresponding operations such as timing and cookware temperature monitoring.

[0037] For example, radar module 1 can be configured to be woken up periodically to collect human signals. The collected data is then sent to the radar processor of radar module 1, which uses a built-in algorithm to determine whether someone is present in the area. Based on this, if the stove detects the absence of a person during use via radar module 1, it will continuously monitor for a set time. After the set time has elapsed, it will send control commands to the gas valve, igniter, or power switch of the induction cooker, ultimately adjusting the flame or automatically shutting off the stove. Conversely, if the stove detects the continued presence of a person during use via radar module 1, radar module 1 can enter a sleep state to reduce power consumption. Therefore, by setting up radar module 1 and associating it with the control module, real-time human detection near the stove can be achieved, ensuring normal operation of the stove even when the user is away, thus improving the user experience.

[0038] Specifically, how radar module 1 transmits and receives signals, and how radar processor and controller implement the corresponding program response design, are all existing technologies and will not be elaborated here.

[0039] For example, in this embodiment, the radar module 1 may use a millimeter-wave radar in the 5.8G or 24G frequency band, which can effectively penetrate non-metallic materials, thereby further improving the detection accuracy and effect of the radar module 1.

[0040] Furthermore, such as Figure 6 As shown, the top of the radar PCB board 11 extends to a position above the center of the control PCB board 20, so that the plane where the radar PCB board 11 is located intersects with the plane where the control PCB board 20 is located. Based on this, the radar antenna 12 is disposed on the upper surface of the radar PCB board 11, and is located near the top edge of the upper surface.

[0041] In other words, the radar PCB board 11 is tilted upward toward the control PCB board 20, and the radar antenna 12 is located at the top edge of the radar PCB board 11. In this way, the radar antenna 12 can be as far away from the control PCB board 20 as possible and closer to the outside of the stove, thereby having a larger detection area.

[0042] In summary, the anti-dry-burning control component provided in this embodiment of the present invention, by setting up a radar module 1 and a mounting bracket 2, allows for convenient and quick installation of the radar module 1. The radar PCB board 11 includes a radar antenna 12 and a radar processor, and is electrically connected to a control PCB board 20. The mounting bracket 2 is connected to the control PCB board 20 of the control module. Furthermore, the mounting bracket 2 is equipped with a connector 4, which connects the mounting bracket 2 to the control PCB board 20 to ensure reliable fixation of the radar module 1 relative to the control module. Thus, the anti-dry-burning control component provided in this embodiment of the present invention can achieve control of the stove's surroundings via the radar antenna 12. The system uses near-field human sensing and monitoring to identify whether there is anyone near the stove. This information is then sent to the control module, allowing the module to take over control of the stove and ensure it remains in normal working order. This ensures the stove can still be used even when the user is away, thus improving the user experience. Furthermore, the radar PCB board 11 is positioned intersecting the control PCB board 20, meaning it is tilted relative to the control PCB board 20. The radar antenna 12 is located near the top edge of the radar PCB board 11, allowing it to be positioned as far away from the control PCB board 20 as possible and closer to the outside of the stove, thus providing a larger detection area.

[0043] It should be noted that when the radar PCB board 11 is connected to the control PCB board 20 through the mounting bracket 2, the mounting bracket 2 only serves to fix the radar PCB board 11 on the control PCB board 20. The radar PCB board 11 cannot be electrically connected to the control PCB board 20 through the mounting bracket 2. Therefore, for example, the mounting bracket 2 can be made of insulating material, such as insulating plastic.

[0044] like Figure 6 As shown, in some embodiments, the plane where the radar PCB board 11 is located and the plane where the control PCB board 20 is located form an angle of 30°-45°. This arrangement enables the radar PCB board 11 to have a better spatial detection range, thereby further improving the signal transmission and reception performance of the radar module 1.

[0045] In this embodiment, the angle between the plane of the radar PCB board 11 and the plane of the control PCB board 20 can be set to 45° to maximize the detection range. Of course, in other embodiments, this angle can be set to other values.

[0046] To accommodate the tilted arrangement of the radar PCB board 11 relative to the control PCB board 20, the connecting pin 132 can be designed in two sections. One section connects to the radar PCB board 11, and the other section connects to the control PCB board 20. This creates a 135° angle between the two sections of the connecting pin 132, facilitating its insertion and fixation onto both the radar PCB board 11 and the control PCB board 20. See [link to details] for further information. Figure 5 As shown.

[0047] In some embodiments, the size of the radar antenna 12 can be set to 8 mm-12 mm along the longitudinal direction of the radar PCB board 11. This setting can effectively reduce the height of the sensor, and the radar antenna 12 is arranged near the upper edge of the sensor so that the antenna is closer to the glass and less likely to be blocked by the metal casing 101 of the stove control device 100.

[0048] It should be noted that the longitudinal direction of the radar PCB board 11 mentioned above is the extension direction along the plane on which the surface of the radar PCB board 11 is located, from the bottom edge to the top edge of the radar PCB board 11.

[0049] In addition, such as Figure 2 As shown, in some embodiments, the radar module 1 can also be disposed on the bottom edge portion of the control PCB board 20 and located in the middle of the bottom edge portion, so as to avoid interference from other metal components on the control PCB board 20 to the radar antenna 12 as much as possible.

[0050] like Figure 3 As shown, in some embodiments, the radar module 1 further includes a communication connector 13, which includes a plurality of connection pins 132. The two ends of the connection pins 132 are respectively connected to the control PCB board 20 and the radar PCB board 11, so that the radar PCB board 11 and the control PCB board 20 are electrically connected through the connection pins 132.

[0051] In a specific implementation, a number of first sockets can be opened on the radar PCB board 11, and one end of each connecting pin 132 is inserted into the first socket 111 and soldered to the radar PCB board 11 so that the communication connector 13 and the radar PCB board 11 together form the radar module 1.

[0052] This configuration not only integrates all the connecting pins 132 through the connector board 131, facilitating docking with the radar PCB board 11, but also ensures the reliability of the connection and signal transmission between the connecting pins 132 and the radar PCB board 11 through the corresponding insertion and soldering connection with the first socket 111.

[0053] Based on the above, the connecting pin 132 is electrically connected to the radar processor on the radar PCB board 11 to transmit the instructions output by the radar processor to the control module of the stove to realize program response. When the connecting pin 132 is soldered to the radar PCB board 11, one end of the connecting pin 132 is first passed through the first socket 111 on the radar PCB board 11, and then the connecting pin 132 and the radar PCB board 11 are soldered at the position of the first socket 111 to achieve physical and electrical connection between the two.

[0054] In addition, when installing the human detection device 10, the radar PCB board 11 can be soldered and fixed to the connecting pin 132 to form the radar module 1 as a whole, and then the radar module 1 as a whole can be installed on the mounting bracket 2 as a component.

[0055] Regarding the fixation of the control PCB board 20 relative to the mounting bracket 2, in some embodiments, the mounting bracket 2 may specifically include a bracket base 21 and two lateral limiting members 22. The two lateral limiting members 22 are respectively disposed on both sides of the bracket base 21, and a limiting groove 23 is formed on the side of the two lateral limiting members 22 that are close to each other. The two side parts of the radar PCB board 11 are respectively located in the limiting grooves 23 formed by the two lateral limiting members 22.

[0056] By setting the lateral limiting members 22 on both sides of the bracket base 21, the two sides of the radar PCB board 11 can be limited and fixed relative to the bracket base 21, thereby ensuring that the radar PCB board 11 is fixed in the lateral direction relative to the mounting bracket 2. At the same time, the two sides of the radar PCB board 11 are located in the limiting grooves 23 formed by the two lateral limiting members 22, which can also limit the radar PCB board 11 in the direction perpendicular to the placement surface relative to the bracket base 21. Therefore, the setting of the lateral limiting members 22 realizes the overall limiting and fixing of the radar PCB board 11, ensuring the structural stability of the human detection device 10.

[0057] Example 2

[0058] like Figure 1 and Figure 2 As shown, this embodiment of the present invention provides a control device 100, which includes a housing 101 and an anti-dry-burning control component as described in Embodiment 1. The housing 101 has a receiving cavity, and the anti-dry-burning control component is located within the receiving cavity.

[0059] In some embodiments, the housing 101 includes a housing body 1012 and a cover plate. The housing body 1012 has a mounting groove with a top opening, and the cover plate covers the top opening to form an accommodating cavity together with the housing body 1012. Furthermore, the cover plate has a clearance opening 1011 at the location of the anti-dry-burning control component, allowing the radar PCB board 11 to be exposed through the clearance opening 1011. This arrangement encloses the anti-dry-burning control component inside the control device 100, thereby providing a certain degree of protection for it.

[0060] like Figure 6 As shown, in some embodiments, the housing body 1012 further includes a bottom plate and a front side plate. The front side plate is connected to the front edge of the bottom plate and extends upward in a direction perpendicular to the bottom plate. A mounting gap b is formed between the radar PCB board 11 and the front side plate, and the lateral dimension of the mounting gap b is 10mm-15mm. This arrangement can maximize the utilization of the internal space of the control device 100 while ensuring the signal transmission and reception effect of the radar module 1.

[0061] Example 3

[0062] This utility model provides a stove, which includes the anti-dry-burning control component as described in Embodiment 1 and the control device 100 as described in Embodiment 2.

[0063] The stove provided in this embodiment of the utility model, by adopting the anti-dry-burning control component and control device 100 of the above-described embodiments, makes the user experience of the stove provided in this embodiment better.

[0064] In some embodiments, the cooktop further includes a chassis and a panel, with the panel covering the top of the chassis, and the electrical box assembly mounted on the chassis. For example, the chassis may be a metal chassis, and the panel may be a glass panel. In this configuration, a mounting groove with a top opening is formed on the metal chassis, the control device 100 is disposed within the mounting groove, and the glass panel covers the top opening to close the mounting groove.

[0065] Based on the above, the control device 100 can be located at the bottom edge of the metal chassis in the inner cavity of the stove, and an installation gap is formed between the center point of the anti-dry burning control component and the bottom edge of the water inlet chassis, with the lateral dimension of the installation gap being not less than 25mm.

[0066] In practice, the center of the anti-dry-burning control component can be positioned at a distance of more than 25mm from the lower edge of the chassis to avoid the lower edge of the chassis shielding the radar signal.

[0067] It should be noted that the center position of the anti-dry burning control component is the center point formed by the overall structure of the anti-dry burning control component. The distance between the center position of the anti-dry burning control component and the lower edge of the chassis refers to the vertical distance from the center position of the anti-dry burning control component to the lower edge of the chassis.

[0068] Due to the specific manufacturing requirements for cooktop panels, explosion-proof mesh or plates are often affixed to the back of the glass panel. For example, a metal explosion-proof mesh may be installed on the side of the glass panel facing the metal chassis. In other words, an explosion-proof zone and a signal avoidance zone are formed on the glass panel, with a metal mesh embedded inside the glass panel, located within the explosion-proof zone.

[0069] The presence of a metal explosion-proof mesh may block the linkage signal. Therefore, the radar module 1 can be located directly below the signal avoidance area to avoid affecting the normal use of the radar module 1.

[0070] In practice, a circular hole can be made in the metal explosion-proof mesh at the position of the corresponding radar module 1 on the glass panel, and the diameter of the circular hole can be larger than the diameter of the radar module 1, thereby effectively solving the signal attenuation and shielding problems and ensuring normal signal transmission and reception.

[0071] In some embodiments, the stove can be turned on via voice control. For example, the stove equipped with an anti-dry-burning control component has an intelligent voice control module, which includes a voice receiving module and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller executes corresponding operations to turn the anti-dry-burning control component on or off, thereby improving the user experience.

[0072] In addition, it should be noted that the stove provided in this embodiment should also include other modules or components that enable it to operate normally. Here, the other modules or components included in the stove provided in this embodiment will not be described one by one.

[0073] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A dry-burning prevention control component with human detection function, characterized in that, include: A control module includes a control PCB board and a controller, wherein the controller is disposed on the control PCB board; A radar module includes a radar PCB board and a mounting bracket. The radar PCB board is electrically connected to the control PCB board. The radar PCB board is mounted on the mounting bracket and is detachably connected to the control PCB board through the mounting bracket. The top of the radar PCB extends to a position above the center of the control PCB, so that the plane on which the radar PCB is located intersects the plane on which the control PCB is located. The radar PCB is provided with a radar antenna and a radar processor. The radar antenna is located on the upper surface of the radar PCB and is located near the top edge of the upper surface.

2. The anti-dry-burning control component as described in claim 1, characterized in that, The plane containing the radar PCB board and the plane containing the control PCB board form an angle, the angle being 30°-45°; and / or, Along the longitudinal direction of the radar PCB board, the size of the radar antenna is 8 mm - 12 mm.

3. The anti-dry-burning control component as described in claim 1, characterized in that, The radar module is mounted on the bottom edge of the control PCB board and is located at the middle of the bottom edge.

4. The anti-dry-burning control component as described in claim 1, characterized in that, The radar module also includes a communication connector, which includes a plurality of connection pins. The two ends of the connection pins are respectively connected to the control PCB board and the radar PCB board, so that the radar PCB board and the control PCB board are electrically connected through the connection pins.

5. A control device, characterized in that, Includes a housing and an anti-dry-burning control component as described in any one of claims 1-4; The outer casing has a cavity, and the anti-dry-burning control component is located within the cavity.

6. The control device as described in claim 5, characterized in that, The outer casing includes a casing body and a cover plate. The casing body has a mounting groove with a top opening, and the cover plate covers the top opening to form the receiving cavity together with the casing body. The cover plate has an opening at the position corresponding to the anti-dry-burning control component, so that the radar PCB board can be exposed from the opening.

7. The control device as described in claim 6, characterized in that, The shell body includes a bottom plate and a front side plate. The front side plate is connected to the front edge of the bottom plate and extends upward in a direction perpendicular to the bottom plate. An installation gap is formed between the radar PCB board and the front side plate, and the lateral dimension of the installation gap is 10mm-15mm.

8. A stove, characterized in that, Includes the control device as described in any one of claims 5-7; The cooktop includes a metal chassis and a glass panel. The metal chassis has a mounting groove with a top opening. The control device is located in the mounting groove. The glass panel covers the top opening to close the mounting groove.

9. The stove as described in claim 8, characterized in that, The glass panel has an explosion-proof area and a signal avoidance area. A metal mesh is embedded inside the glass panel. The metal mesh is located within the explosion-proof area. The radar module is located directly below the signal avoidance area.

10. The stove as described in claim 8, characterized in that, The control device is located inside the stove near the bottom edge of the metal chassis, and an installation gap is formed between the center point of the anti-dry burning control component and the bottom edge of the metal chassis, the lateral dimension of the installation gap being not less than 25mm.

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