Magnetic suction sealing device at bottom of clean room door

Abstract

The invention provides a clean room door bottom magnetic suction sealing device which comprises a door frame installed on a wall, a door plate is arranged in the door frame, a switch button is arranged on the door frame, a hollow cavity is formed in the lower portion of the door plate, and a C-shaped fixing piece and a connecting piece connected with the C-shaped fixing piece are arranged in the hollow cavity in a connected mode. An airtight device used for preventing air leakage in the clean room is arranged on the connecting piece and comprises a magnetic induction coil, a sealing cushion, a steel pipe and a spring, the magnetic induction coil is arranged in the ground under the door plate, the two ends of the sealing cushion are connected with the two ends of the lower portion of the connecting piece, and a fixing ring is arranged on the side, close to the spring, of the middle of the sealing cushion. When the door plate is closed, the magnetic induction coil is powered on to generate magnetic force, at the moment, under the action of the magnetic force, the steel pipe drives the sealing cushion to move downwards, the sealing cushion is tightly connected with the ground in an abutting mode, high sealing is achieved, and air tightness is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of clean room equipment, and more specifically relates to a magnetic suction airtight device at the bottom of a clean room door. Background Art

[0002] A clean room, also known as a dust-free workshop, dust-free room or clean room, refers to a space within a certain range of space where pollutants such as particles, harmful air, bacteria, etc. are removed from the air, and the indoor temperature, pressure, air flow velocity, air flow distribution, noise vibration, lighting, and static electricity are controlled within a certain required range. When the external air conditions occur, the room can maintain the originally set cleanliness, temperature, humidity, and pressure.

[0003] In the construction of clean rooms, clean doors are one of the important projects of building decoration. The sealing effect of clean doors directly affects the air quality in clean rooms. Although the clean doors used in current clean rooms have a certain sealing effect, the sealing effect is not good. In addition, sealing strips are used to seal the existing door frames. However, due to the continuous opening and closing of the door, the sealing strips are easily worn out after long-term friction, which makes the sealing effect of the clean door gradually reduce during use.

[0004] In the existing technology, most of them use mechanical airtight strips. Due to the installation process and the uneven ground level on site, there is still a gap between the bottom of the door body and the ground, which cannot be completely and effectively sealed, resulting in clean room air volume leakage, pressure difference control is affected, and energy is wasted. Summary of the invention

[0005] Therefore, in order to solve the above technical problems, the present invention proposes a magnetic suction airtight device at the bottom of a clean room door, comprising a door frame installed on a wall, a door panel 10 is arranged in the door frame, a switch button 190 is arranged on the door frame, and the door frame cooperates with the door panel 10, the lower part of the door panel 10 is a hollow cavity, a C-shaped fixing part 20 is connected in the hollow cavity, and a connecting part 30 connected to the C-shaped fixing part 20 is arranged, the lower part of the connecting part 30 is a trumpet shape with an opening downward, the two ends of the lower part of the connecting part 30 are connected to the door panel 10, an airtight device 40 for blocking air leakage in the clean room is arranged on the connecting part 30, the airtight device 40 comprises a magnetic induction coil 401, a sealing cushion 402, a steel pipe 403 and a spring 404, the magnetic induction coil 401 is arranged in the ground directly below the door panel 10, the two ends of the sealing cushion 402 are connected to the two ends of the lower part of the connecting part 30, and the middle part of the sealing cushion 402 is close to the A fixing ring 50 is provided on one side of the spring 404, and the fixing ring 50 is sleeved with the steel pipe 403. One end of the spring 404 is connected to the top of the connecting piece 30, and the other end of the spring 404 is connected to the steel pipe 403. When the door panel 10 is closed, the magnetic induction coil 401 is energized to generate magnetic force. At this time, under the action of the magnetic force, the steel pipe 403 drives the sealing cushion 402 to move downward, and the sealing cushion 402 is tightly abutted against the ground, thereby making the clean room inside and the clean room outside disconnected. When the door panel 10 needs to be opened, the switch button 190 is pressed, the magnetic induction coil 401 is powered on and off, the magnetic force disappears, and the steel pipe 403 is driven to reset upward under the elasticity of the spring 404, thereby making the sealing cushion 402 move upward. Through the mutual cooperation of the magnetic induction coil 401 and the steel pipe 403, a high degree of sealing is achieved, air tightness is ensured, pressure difference is guaranteed, and energy is saved at the same time, so that the sealing of the clean door is better.

[0006] A magnetic suction airtight device at the bottom of a clean room door, comprising a door frame installed on a wall, a door panel 10 being arranged in the door frame, a switch button 190 being arranged on the door frame, and the door frame being matched with the door panel 10, the lower part of the door panel 10 being a hollow cavity, a C-shaped fixing part 20 being connected in the hollow cavity, and a connecting part 30 connected to the C-shaped fixing part 20 being arranged, the lower part of the connecting part 30 being in the shape of a trumpet with an opening downward, the two ends of the lower part of the connecting part 30 being connected to the door panel 10, an airtight device 40 for blocking air leakage in the clean room being arranged on the connecting part 30, the airtight device 40 comprising a magnetic induction coil 401, a sealing cushion 402, a steel pipe 403 and a spring 404, the magnetic induction coil 401 being arranged in the ground directly below the door panel 10, the two ends of the sealing cushion 402 being connected to the lower part of the connecting part 30 The two ends of the sealing cushion 402 are connected, and a fixing ring 50 is provided on one side of the middle part of the sealing cushion 402 close to the spring 404, and the fixing ring 50 is sleeved with the steel pipe 403. One end of the spring 404 is connected to the top of the connecting piece 30, and the other end of the spring 404 is connected to the steel pipe 403. When the door panel 10 is closed, the magnetic induction coil 401 is energized to generate a magnetic force. At this time, under the action of the magnetic force, the steel pipe 403 drives the sealing cushion 402 to move downward, and the sealing cushion 402 is tightly in contact with the ground, thereby disconnecting the clean room from the clean room. When the door panel 10 needs to be opened, the switch button 190 is pressed, the magnetic induction coil 401 is powered on and off, the magnetic force disappears, and the steel pipe 403 is driven to reset upward under the elasticity of the spring 404, thereby moving the sealing cushion 402 upward.

[0007] Furthermore, a pin 60 is provided on the top of the connecting member 30 , and the pin 60 is engaged with the connecting member 30 , and the pin 60 is used to fix the spring 404 .

[0008] Furthermore, a platform 70 extending toward the connecting member 30 is provided at the open end of the C-shaped fixing member 20, and a support plate 80 is provided in the middle of the connecting member 30 near the C-shaped fixing member 20. The platform 70 is used to carry the support plate 80, thereby indirectly increasing the contact area between the connecting member 30 and the C-shaped fixing member 20 to prevent falling.

[0009] Furthermore, the steel tube 403 is provided with a channel 90 near the spring 404, and a circular cavity connected to one end of the channel 90 is also provided in the steel tube 403, and the cross-sectional diameter of the circular cavity is larger than the cross-sectional diameter of the channel 90. The spring 404 is close to one end of the channel 90, and after rotating through the channel 90, it abuts against the circular cavity. Due to the elasticity of the spring 404, it will extend outward after entering the circular cavity. The cross-sectional diameter of the extended spring 404 is larger than the diameter of the channel 90, and it is not easy to disengage when moving up and down.

[0010] Furthermore, the opening end of the connector 30 is provided with a slot 100 extending toward the sealing cushion 402 , and both ends of the sealing cushion 402 are provided with circular clips 110 matching the slot 100 , and the circular clips 110 are interference fit with the slot 100 .

[0011] Furthermore, the sealing cushion 402 , the fixing ring 50 and the circular clamp 110 are integrally formed and are made of elastic material.

[0012] Furthermore, the elastic material is rubber or silicone.

[0013] Furthermore, a partition plate 120 is provided on the upper portion of the connecting member 30 to enhance strength.

[0014] Furthermore, when the magnetic force disappears, an angle is formed between the open end of the connector 30 and the connection points at both ends of the sealing gasket 402 to avoid the sealing gasket 402 from moving up and down and wearing the open end of the connector 30.

[0015] Furthermore, the angle between the opening end of the connector 30 and the two ends of the sealing cushion 402 is 0-15 degrees.

[0016] Furthermore, a protrusion 130 is provided on the side of the sealing cushion 402 close to the ground, and there are at least two protrusions 130, so as to provide better sealing performance. Meanwhile, when magnetism is applied, the sealing cushion 402 moves downward to abut against the ground, thereby playing a role of buffering and force distribution.

[0017] Furthermore, a resin-filled solidified material 140 is provided outside the magnetic induction coil 401 for waterproofing and insulation.

[0018] Furthermore, the connecting member 30 is connected to a leveling member 150, and side sealing plates 160 are provided at both ends of the hollow cavity. The side sealing plates 160 are provided with adjustment grooves 170 that match and engage with the leveling member 150. When the C-shaped fixing member 20 and the connecting member 30 are installed, the leveling member 150 is engaged with the adjustment groove 170, so that the side sealing plate 160 is sealed with the door panel 10, which is used to adjust the side sealing plate 160 to be flush with the outer surface of the door panel 10.

[0019] Furthermore, a plurality of fastening buckles 180 are provided on the side sealing plate 160 , and the fastening buckles 180 are engaged with the connecting member 30 to prevent the side sealing plate 160 from falling off.

[0020] Furthermore, the door frame is also provided with a light switch 200 and a control box 210. The light switch 200 is used to detect the opening and closing signal of the door panel and transmit the received signal to the control box 210. The control box 210 is provided with a first switch 220, a second switch 230, a KM1 contact 240, a KM1 coil 250, a KM2 contact 260, and a KM2 coil 270. Under normal conditions, the first switch 220 is closed, the KM2 contact 260 is closed, so that the KM1 coil 250 is energized, driving the KM2 coil 270. The M1 contact 240 is closed, and the magnetic induction coil 401 generates magnetic force, so that the steel pipe 403 drives the sealing cushion 402 to move downward, and the sealing cushion 402 is tightly in contact with the ground. When the door needs to be opened, the switch button 190 is pressed, and the second switch 230 is closed, the KM2 coil 270 is energized, the KM2 contact 260 is opened, and the KM1 contact 240 is opened, and the magnetic induction coil 401 is demagnetized, and the steel pipe 403 is driven to reset upward under the elasticity of the spring 404.

[0021] Beneficial effects of the present invention: The present invention proposes a magnetic suction airtight device at the bottom of a clean room door, comprising a door frame installed on a wall, a door panel 10 being arranged in the door frame, a switch button 190 being arranged on the door frame, and the door frame cooperates with the door panel 10, the lower part of the door panel 10 is a hollow cavity, a C-shaped fixing part 20 is connected in the hollow cavity, and a connecting part 30 connected to the C-shaped fixing part 20 is arranged, the lower part of the connecting part 30 is a trumpet shape with an opening downward, the two ends of the lower part of the connecting part 30 are connected to the door panel 10, an airtight device 40 for blocking air leakage in the clean room is arranged on the connecting part 30, the airtight device 40 comprises a magnetic induction coil 401, a sealing cushion 402, a steel pipe 403 and a spring 404, the magnetic induction coil 401 is arranged in the ground directly below the door panel 10, the two ends of the sealing cushion 402 are connected to the two ends of the lower part of the connecting part 30, the middle part of the sealing cushion 402 is close to the spring A fixing ring 50 is provided on one side of the spring 404, and the fixing ring 50 is sleeved with the steel pipe 403. One end of the spring 404 is connected to the top of the connecting piece 30, and the other end of the spring 404 is connected to the steel pipe 403. When the door panel 10 is closed, the magnetic induction coil 401 is energized to generate magnetic force. At this time, under the action of the magnetic force, the steel pipe 403 drives the sealing cushion 402 to move downward, and the sealing cushion 402 is tightly abutted against the ground, thereby making the clean room inside and the clean room outside disconnected. When the door panel 10 needs to be opened, the switch button 190 is pressed, the magnetic induction coil 401 is powered on and off, the magnetic force disappears, and the steel pipe 403 is driven to reset upward under the elasticity of the spring 404, thereby making the sealing cushion 402 move upward. Through the mutual cooperation of the magnetic induction coil 401 and the steel pipe 403, a high degree of sealing is achieved, air tightness is ensured, pressure difference is guaranteed, and energy is saved at the same time, so that the sealing of the clean door is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a cross-sectional view of a magnetic suction airtight device at the bottom of a clean room door when the magnetic field is cut off.

[0023] Figure 2 This is a cross-sectional view of a magnetic suction airtight device at the bottom of a clean room door of the present invention when magnetized.

[0024] Figure 3 The present invention is a partial structural schematic diagram of a magnetic suction airtight device at the bottom of a clean room door.

[0025] Figure 4 The present invention is a schematic diagram of the side sealing plate structure of a magnetic suction airtight device at the bottom of a clean room door.

[0026] Figure 5 The present invention is a schematic structural diagram of a magnetic suction airtight device at the bottom of a clean room door.

[0027] Description of main component symbols:

[0028] Door panel 10, C-shaped fixing part 20, connecting part 30, airtight device 40, magnetic induction coil 401, sealing cushion 402, steel pipe 403, spring 404, fixing ring 50, pin 60, carrier 70, support plate 80, channel 90, card slot 100, circular card part 110, partition 120, protrusion 130, resin filling solid 140, leveling part 150, side sealing plate 160, adjustment groove 170, fastening buckle 180, switch button 190, light switch 200, control box 210, first switch 220, second switch 230, KM1 contact 240, KM1 coil 250, KM2 contact 260, KM2 coil 270.

[0029] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] The following examples are described to assist the understanding of the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0031] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including within a single system or component).

[0032] At the same time, the connections between components or systems are not intended to be limited to direct connections, rather, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections. Example 1

[0033] like Figure 1 As shown in FIG. 1 , it is a cross-sectional view of a magnetic suction airtight device at the bottom of a clean room door of the present invention when the magnetic field is cut off; Figure 2 As shown in FIG. 1 , it is a cross-sectional view of a magnetic suction airtight device at the bottom of a clean room door of the present invention when magnetized; Figure 3 As shown, it is a partial structural schematic diagram of a magnetic suction airtight device at the bottom of a clean room door of the present invention; Figure 4 As shown in FIG. 1 , it is a schematic diagram of the side sealing plate structure of a magnetic suction airtight device at the bottom of a clean room door according to the present invention; Figure 5 The figure is a schematic structural diagram of a magnetic suction airtight device at the bottom of a clean room door according to the present invention.

[0034] A magnetic suction airtight device at the bottom of a clean room door, comprising a door frame installed on a wall, a door panel 10 being arranged in the door frame, a switch button 190 being arranged on the door frame, and the door frame being matched with the door panel 10, the lower part of the door panel 10 being a hollow cavity, a C-shaped fixing part 20 being connected in the hollow cavity, and a connecting part 30 connected to the C-shaped fixing part 20 being arranged, the lower part of the connecting part 30 being in the shape of a trumpet with an opening downward, the two ends of the lower part of the connecting part 30 being connected to the door panel 10, an airtight device 40 for blocking air leakage in the clean room being arranged on the connecting part 30, the airtight device 40 comprising a magnetic induction coil 401, a sealing cushion 402, a steel pipe 403 and a spring 404, the magnetic induction coil 401 being arranged in the ground directly below the door panel 10, the two ends of the sealing cushion 402 being connected to the lower part of the connecting part 30 The two ends of the sealing cushion 402 are connected, and a fixing ring 50 is provided on one side of the middle part of the sealing cushion 402 close to the spring 404, and the fixing ring 50 is sleeved with the steel pipe 403. One end of the spring 404 is connected to the top of the connecting piece 30, and the other end of the spring 404 is connected to the steel pipe 403. When the door panel 10 is closed, the magnetic induction coil 401 is energized to generate a magnetic force. At this time, under the action of the magnetic force, the steel pipe 403 drives the sealing cushion 402 to move downward, and the sealing cushion 402 is tightly in contact with the ground, thereby disconnecting the clean room from the clean room. When the door panel 10 needs to be opened, the switch button 190 is pressed, the magnetic induction coil 401 is powered on and off, the magnetic force disappears, and the steel pipe 403 is driven to reset upward under the elasticity of the spring 404, thereby moving the sealing cushion 402 upward.

[0035] A pin 60 is disposed on the top of the connecting member 30 , and the pin 60 is engaged with the connecting member 30 . The pin 60 is used to fix the spring 404 .

[0036] The open end of the C-shaped fixing member 20 is provided with a carrier 70 extending toward the connecting member 30, and the middle part of the connecting member 30 near the C-shaped fixing member 20 is provided with a support plate 80, and the carrier 70 is used to carry the support plate 80, thereby indirectly increasing the contact area between the connecting member 30 and the C-shaped fixing member 20 to prevent falling.

[0037] The steel tube 403 is provided with a channel 90 near the spring 404, and a circular cavity connected to one end of the channel 90 is also provided in the steel tube 403, and the cross-sectional diameter of the circular cavity is larger than the cross-sectional diameter of the channel 90. The spring 404 is close to one end of the channel 90, and after rotating through the channel 90, it abuts against the circular cavity. Due to the elasticity of the spring 404, it will extend outward after entering the circular cavity. The cross-sectional diameter of the extended spring 404 is larger than the diameter of the channel 90, and it is not easy to disengage when moving up and down.

[0038] The opening end of the connector 30 is provided with a slot 100 extending toward the sealing cushion 402 , and both ends of the sealing cushion 402 are provided with circular clips 110 matching the slot 100 , and the circular clips 110 are interference fit with the slot 100 .

[0039] The sealing cushion 402 , the fixing ring 50 and the circular clamp 110 are integrally formed and are made of elastic material.

[0040] The elastic material is rubber or silicone.

[0041] A partition plate 120 is also provided on the upper portion of the connecting member 30 to enhance the strength.

[0042] When the magnetic force disappears, an angle is formed between the open end of the connector 30 and the connection points of the two ends of the sealing gasket 402 to avoid the sealing gasket 402 from moving up and down and wearing the open end of the connector 30.

[0043] The angle between the opening end of the connector 30 and the two ends of the sealing cushion 402 is 0-15 degrees.

[0044] The sealing cushion 402 is provided with a protrusion 130 on one side close to the ground. There are at least two protrusions 130, which provide better sealing performance. When magnetization occurs, the sealing cushion 402 moves downward and abuts against the ground, thereby providing buffering and force distribution.

[0045] A resin-filled solidified material 140 is disposed outside the magnetic induction coil 401 for waterproofing and insulation.

[0046] Beneficial effects of the present invention: The present invention proposes a magnetic suction airtight device at the bottom of a clean room door, comprising a door frame installed on a wall, a door panel 10 being arranged in the door frame, a switch button 190 being arranged on the door frame, and the door frame cooperates with the door panel 10, the lower part of the door panel 10 is a hollow cavity, a C-shaped fixing part 20 is connected in the hollow cavity, and a connecting part 30 connected to the C-shaped fixing part 20 is arranged, the lower part of the connecting part 30 is a trumpet shape with an opening downward, the two ends of the lower part of the connecting part 30 are connected to the door panel 10, an airtight device 40 for blocking air leakage in the clean room is arranged on the connecting part 30, the airtight device 40 comprises a magnetic induction coil 401, a sealing cushion 402, a steel pipe 403 and a spring 404, the magnetic induction coil 401 is arranged in the ground directly below the door panel 10, the two ends of the sealing cushion 402 are connected to the two ends of the lower part of the connecting part 30, the middle part of the sealing cushion 402 is close to the spring A fixing ring 50 is provided on one side of the spring 404, and the fixing ring 50 is sleeved with the steel pipe 403. One end of the spring 404 is connected to the top of the connecting piece 30, and the other end of the spring 404 is connected to the steel pipe 403. When the door panel 10 is closed, the magnetic induction coil 401 is energized to generate magnetic force. At this time, under the action of the magnetic force, the steel pipe 403 drives the sealing cushion 402 to move downward, and the sealing cushion 402 is tightly abutted against the ground, thereby making the clean room inside and the clean room outside disconnected. When the door panel 10 needs to be opened, the switch button 190 is pressed, the magnetic induction coil 401 is powered on and off, the magnetic force disappears, and the steel pipe 403 is driven to reset upward under the elasticity of the spring 404, thereby making the sealing cushion 402 move upward. Through the mutual cooperation of the magnetic induction coil 401 and the steel pipe 403, a high degree of sealing is achieved, air tightness is ensured, pressure difference is guaranteed, and energy is saved at the same time, so that the sealing of the clean door is better.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A magnetic suction airtight device at the bottom of a clean room door, comprising a door frame mounted on a wall, a door panel (10) being arranged in the door frame, a switch button (190) being arranged on the door frame, and the door frame and the door panel (10) being matched, characterized in that: The lower part of the door panel (10) is a hollow cavity, in which a C-shaped fixing piece (20) is connected, and a connecting piece (30) connected to the C-shaped fixing piece (20) is provided, the lower part of the connecting piece (30) is in the shape of a trumpet with an opening facing downward, and the two ends of the lower part of the connecting piece (30) are connected to the door panel (10), and the connecting piece (30) is provided with an airtight device (40) for preventing air leakage in the clean room, the airtight device (40) comprising a magnetic induction coil (401), a sealing cushion (402), a steel pipe (403) and a spring (404), the magnetic induction coil (401) is arranged on the ground directly below the door panel (10), the two ends of the sealing cushion (402) are connected to the two ends of the lower part of the connecting piece (30), and a middle part of the sealing cushion (402) is provided on one side close to the spring (404). A fixing ring (50) is provided, the fixing ring (50) being sleeved with the steel pipe (403), one end of the spring (404) being connected to the top end of the connecting piece (30), and the other end of the spring (404) being connected to the steel pipe (403). When the door panel (10) is closed, the magnetic induction coil (401) is energized to generate magnetic force. At this time, under the action of the magnetic force, the steel pipe (403) drives the sealing cushion (402) to move downward, and the sealing cushion (402) is tightly in contact with the ground, thereby disconnecting the clean room from the clean room. When it is necessary to open the door panel (10), the switch button (190) is pressed, the magnetic induction coil (401) is powered on and off, the magnetic force disappears, and the steel pipe (403) is driven to reset upward under the elasticity of the spring (404), thereby causing the sealing cushion (402) to move upward.

2. The magnetic suction airtight device at the bottom of the clean room door according to claim 1, characterized in that: A pin (60) is provided at the top of the connecting member (30), the pin (60) being engaged with the connecting member (30), and the pin (60) being used to fix the spring (404).

3. The magnetic suction airtight device at the bottom of the clean room door according to claim 2, characterized in that: The open end of the C-shaped fixing member (20) is provided with a carrier (70) extending towards the connecting member (30); a support plate (80) is provided in the middle of the connecting member (30) near the C-shaped fixing member (20); the carrier (70) is used to carry the support plate (80), thereby indirectly increasing the contact area between the connecting member (30) and the C-shaped fixing member (20) to prevent the connecting member (30) from falling.

4. The magnetic suction airtight device at the bottom of the clean room door according to claim 3, characterized in that: The steel tube (403) is provided with a channel (90) near the spring (404), and a circular cavity connected to one end of the channel (90) is also provided in the steel tube (403), and the cross-sectional diameter of the circular cavity is larger than the cross-sectional diameter of the channel (90). The spring (404) is close to one end of the channel (90), rotates through the channel (90) and abuts against the circular cavity. Due to the elasticity of the spring (404), it extends outward after entering the circular cavity. The cross-sectional diameter of the extended spring (404) is larger than the diameter of the channel (90), and is not easy to disengage when moving up and down.

5. The magnetic suction airtight device at the bottom of the clean room door according to claim 4, characterized in that: The opening end of the connecting piece (30) is provided with a slot (100) extending towards the sealing cushion (402), and both ends of the sealing cushion (402) are provided with circular clips (110) matching the slot (100), and the circular clips (110) are interference-fitted with the slot (100).

6. The magnetic suction airtight device at the bottom of the clean room door according to claim 5, characterized in that: The sealing cushion (402), the fixing ring (50) and the circular clamp (110) are integrally formed and are made of elastic material.

7. The magnetic suction airtight device at the bottom of the clean room door according to claim 6, characterized in that: When the magnetic force disappears, an angle is formed between the opening end of the connecting piece (30) and the connection points at both ends of the sealing cushion (402), which is used to avoid the sealing cushion (402) from moving up and down and preventing the opening end of the connecting piece (30) from being worn.

8. The magnetic suction airtight device at the bottom of the clean room door according to claim 7, characterized in that: The angle between the opening end of the connecting piece (30) and the two ends of the sealing cushion (402) is 0-15 degrees.

9. The magnetic suction airtight device at the bottom of the clean room door according to claim 8, characterized in that: The sealing cushion (402) is provided with a protrusion (130) on one side close to the ground. There are at least two protrusions (130), which provide better sealing performance. When magnetization occurs, the sealing cushion (402) moves downward to abut against the ground, thereby providing buffering and force distribution.

10. The magnetic suction airtight device at the bottom of the clean room door according to claim 9, characterized in that: A resin-filled solidified material (140) is provided outside the magnetic induction coil (401) for waterproofing and insulation.

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