An energy-absorbing bulletproof door bumper

Abstract

The present invention provides an energy-absorbing bulletproof anti-disengaging door stopper, belonging to the technical field of door stoppers. It solves the technical problem that the existing door stopper structure may disengage when the impact force of the door body is relatively large. This energy-absorbing bulletproof anti-disengaging door stopper includes a seat body and a collision head. A stroke cavity is provided inside the seat body. The inner end of the collision head is slidably fitted inside the stroke cavity, and the stroke cavity communicates with the outside. A damping member is provided between the inner end of the collision head and the seat body. A sealing ring is sleeved around the outer periphery of the collision head. When the collision head slides outward relative to the seat body, the sealing ring seals and abuts between the collision head and the inner side wall of the stroke cavity. When the collision head slides inward relative to the seat body, an air passage can be formed between the sealing ring and the collision head or the inner side wall of the stroke cavity, and the chambers of the stroke cavity on both sides of the sealing ring are connected. This energy-absorbing bulletproof anti-disengaging door stopper can effectively prevent the door body from rebounding and breaking free.

Description

Technical Field

[0001] The invention belongs to the technical field of door collision, and relates to an energy-absorbing and bullet-proof door collision. Background Art

[0002] In order to prevent the door from rotating randomly due to external forces when it is opened, a door stopper is usually set between the lower back of the door and the wall. The current door stopper mainly uses the suction force of magnets to attract the suction seat and the suction column to fix the door. When the door rotates quickly during attraction, the suction seat and the suction column make a collision sound, which is also easy to damage the door stopper and shorten its service life. To solve this problem, technicians in the field add buffer components such as springs to the door stopper to absorb the impact of the door body through the deformation of the buffer component to achieve a silent effect.

[0003] The applicant has previously developed a reset air valve with authorization announcement number CN209637469U, which includes a seat body and a collision part axially connected to the seat body for sliding, a stroke cavity is provided between the collision part and the seat body, an air duct for discharging air medium out of the stroke cavity is opened on the cavity wall of the stroke cavity, an axially arranged elastic part is provided between the collision part and the seat body, and the collision part and the seat body can move relative to each other to squeeze the elastic part into a sheet shape.

[0004] The above door bump structure is simple and has good buffering effect. On this basis, the applicant further developed and intended to invent a door bump structure that can prevent the door body from bouncing off after collision. To achieve the above purpose, a person skilled in the art can easily consider: 1. Increase the magnetic attraction in the door bump to prevent it from bouncing off after collision; 2. Set a locking structure on the door bump or the door body to lock the two when a collision occurs, so that the two cannot be separated after the collision; 3. Set more buffer devices in the door bump to absorb and consume the energy when the door body collides. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention provides an energy-absorbing and bullet-proof door. The technical problem to be solved by the present invention is: how to prevent the door body from rebounding and breaking free.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An energy-absorbing bulletproof door bumper, comprising a seat body and a collision head. A stroke cavity is provided inside the seat body. The inner end of the collision head is slidably fitted inside the stroke cavity, and the stroke cavity communicates with the outside. A damping member is provided between the inner end of the collision head and the seat body. It is characterized in that a sealing ring is sleeved around the outer periphery of the collision head. When the collision head slides outward relative to the seat body, the sealing ring seals and abuts between the collision head and the inner side wall of the stroke cavity. When the collision head slides inward relative to the seat body, an air passage is formed between the sealing ring and the collision head or the inner side wall of the stroke cavity, and the chambers of the stroke cavity on both sides of the sealing ring are communicated with each other.

[0008] The seat body is used to be fixed on the ground, wall or door body. The collision head and the seat body cooperate to slide axially within the range of the stroke cavity. The stroke cavity communicates with the outside through the bottom of the seat body or the fitting gap between the seat body and the collision head. Existing collision heads are provided with magnetic components such as magnets to cooperate with the matching suction seats. A damping member is provided between the inner end of the collision head and the seat body. The damping member can be a damping rod or a compression spring, etc., which can buffer the collision head. By sleeving a sealing ring around the outer periphery of the collision head, when the collision head slides outward relative to the seat body, the sealing ring seals and abuts between the collision head and the inner side wall of the stroke cavity. When the collision head slides inward relative to the seat body, an air passage communicating the outside with the stroke cavity is formed between the sealing ring and the collision head or the inner side wall of the stroke cavity. In this way, when the door body impacts the collision head and is attracted by the set magnet, the air in the stroke cavity can be smoothly discharged along the air passage, making the buffer damping received by the door body softer, extending the buffer stroke of the door body and ensuring that it will not rebound in advance. When the damping member starts to release the absorbed energy and pushes the collision head to drive the door body to start moving outward, the sealing ring seals and abuts between the collision head and the inner side wall of the stroke cavity. In this way, a lower negative pressure is formed in the stroke cavity, increasing the movement resistance of the collision head, thereby effectively consuming the energy released by the damping member, and thus controlling the speed of the door body rebounding with the collision head in place within the restraint range of the magnetic component, effectively avoiding the door body rebounding and breaking free.

[0009] In the above energy-absorbing, bulletproof and anti-disengaging door bumper, the outer edge surface of the sealing ring has a friction section extending circumferentially. The outer edge of the friction section abuts against the inner side wall of the stroke cavity. The outer edge surface of the friction section is conical, and the end close to the outer end of the collision head is the large end. By providing a friction section extending circumferentially on the outer edge surface of the sealing ring, making the outer edge surface of the friction section conical and the end close to the outer end of the collision head the large end, when the collision head slides into the seat body, the edge of the large end of the friction section can be deformed by the extrusion of the air in the stroke cavity and form an air passage with the side wall in the stroke cavity. At this time, the air in the stroke cavity can be easily discharged along the conical surface of the friction section, thus ensuring the damping softness; when the collision head slides out of the seat body, a negative pressure is formed in the stroke cavity, and the external air presses the large end of the friction section to deform radially outward so as to closely adhere to the inner side wall of the stroke cavity, thus forming a seal and reducing the flow rate of the external air entering the stroke cavity, thereby ensuring the movement resistance of the collision head during this process.

[0010] In the above energy-absorbing, bulletproof and anti-disengaging door bumper, the sealing ring is made of a soft material. The side of the sealing ring close to the outer end of the collision head has a circumferentially extending relief groove, and the relief groove is radially aligned with the position of the friction section. By setting the sealing ring as a soft material part, the deformation effect can be further ensured. A circumferentially extending relief groove is provided on the side of the sealing ring close to the outer end of the collision head, and the relief groove is radially aligned with the position of the friction section. In this way, the relief groove can provide sufficient relief space for the inward deformation of the friction section, making the air discharge smoother. In addition, when the stroke cavity is under negative pressure, the external air can fully enter the relief groove to effectively expand the friction section outward, further ensuring the energy absorption effect.

[0011] In the above energy-absorbing, bulletproof and anti-disengaging door bumper, the outer edge surface of the sealing ring also has a number of support ribs arranged at intervals in sequence along the circumference, and the support ribs abut against the inner side wall of the stroke cavity. By providing a number of support ribs on the outer edge surface of the sealing ring to abut against the inner side wall of the stroke cavity, during the sliding process of the collision head, the support ribs can ensure the stable movement position of the collision head and reduce the direct scraping and wear between the collision head and the inner side wall of the stroke cavity.

[0012] In the above energy-absorbing, bulletproof and anti-ejecting door bumper, the outer peripheral surface of the collision head has a limiting ring groove extending circumferentially. The part of the collision head facing the limiting ring groove forms a limiting section. The limiting section is conical and the end closer to the inner end of the collision head is the large end. The sealing ring is sleeved around the outer periphery of the limiting section and the inner diameter of the inner edge of the sealing ring is smaller than the diameter of the large end of the limiting section. When the collision head slides outwards relative to the seat body, the sealing ring can move to the large end of the limiting section and abut against the side wall of the stroke cavity in the radial direction. By having a limiting ring groove extending circumferentially on the outer peripheral surface of the collision head, the part of the collision head facing the limiting ring groove forms a conical limiting section. The sealing ring is sleeved around the outer periphery of the limiting section and the inner diameter of the inner edge of the sealing ring is smaller than the diameter of the large end of the limiting section. In this way, when the collision head slides outwards relative to the seat body, the sealing ring will be driven by the friction of the side wall of the stroke cavity and move towards the large end of the limiting section. In this way, the inner edge of the sealing ring will be supported by the large end of the limiting section and expand outwards, thus pressing more tightly against the side wall of the stroke cavity, increasing the frictional resistance in this process and the consumption of energy of the damping member, effectively avoiding the ejecting phenomenon. When the collision head slides inwards relative to the seat body, the sealing ring will be driven by the friction of the side wall of the stroke cavity and move towards the small end of the limiting section. Sufficient collapse space and air escape space are obtained at the inner edge of the sealing ring, ensuring that the acting force between the sealing ring and the side wall of the stroke cavity is within a small range and ensuring the damping softness in this process. The sealing ring can be an O-ring, a sealing ring with a rectangular cross-section or a combined hole seal, etc.

[0013] In the above energy-absorbing, bulletproof and anti-ejecting door bumper, a second elastic member is also sleeved around the small end of the limiting section. The second elastic member always has a tendency to push the sealing ring axially to the large end of the limiting section. By sleeving a second elastic member around the small end of the limiting section, the second elastic member can be a compression spring, etc. In this way, the second elastic member can ensure that the inner edge of the sealing ring can be fully supported by the large end of the limiting section when the collision head slides outwards relative to the seat body, ensuring the friction effect. When the collision head slides inwards relative to the seat body, the compression spring can also ensure the air escape space.

[0014] As another solution, the outer peripheral surface of the collision head has a limiting ring groove extending circumferentially. The sealing ring is located in the limiting ring groove and can reciprocate axially along the collision head. The sealing ring is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity. On one side of the sealing ring close to the outer end of the collision head, there are several support blocks arranged at intervals in the circumferential direction. When the support blocks are in contact with the inner side wall of the limiting ring groove, the space between two adjacent support blocks forms the air passage. By providing a limiting ring groove extending circumferentially on the outer peripheral surface of the collision head, the sealing ring is located in the limiting ring groove and can reciprocate axially along the collision head. The sealing ring is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity. On one side of the sealing ring close to the outer end of the collision head, several support blocks are arranged at intervals in the circumferential direction. In this way, when the collision head slides into the seat body, the support blocks on the sealing ring are in contact with the inner side wall of the limiting ring groove, and the space between two adjacent support blocks forms the air passage, reducing the movement resistance of the collision head. When the collision head slides out of the seat body, the other side of the sealing ring can be in sealing contact with the inner side wall of the limiting ring groove, increasing the movement resistance of the collision head.

[0015] As another solution, the outer peripheral surface of the collision head has a limiting ring groove extending circumferentially. The sealing ring is located in the limiting ring groove and can reciprocate axially along the collision head. The sealing ring is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity. On one side wall of the limiting ring groove close to the outer end of the collision head, there are several support teeth. When the sealing ring is in contact with the support teeth, the space between two adjacent support teeth forms the air passage. By providing a limiting ring groove extending circumferentially on the outer peripheral surface of the collision head, the sealing ring is located in the limiting ring groove and can reciprocate axially along the collision head. The sealing ring is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity. On one side wall of the limiting ring groove close to the outer end of the collision head, there are several support teeth. In this way, when the collision head slides into the seat body, the support teeth are in contact with the sealing ring, and the space between two adjacent support teeth forms the air passage, reducing the movement resistance of the collision head. When the collision head slides out of the seat body, the other side of the sealing ring can be in sealing contact with the inner side wall of the limiting ring groove, increasing the movement resistance of the collision head.

[0016] In the above energy-absorbing bulletproof door bumper, a wear-resistant ring is further sleeved on the periphery of the collision head. The wear-resistant ring is made of POM material or nylon material or metal or rubber or plastic. The wear-resistant ring always has a tendency to expand radially outward along the collision head and is in contact with the inner side wall of the stroke cavity. By sleeving a wear-resistant ring with an outer diameter matching the inner diameter of the stroke cavity on the outer peripheral surface of the collision head, and setting the wear-resistant ring to be made of POM material or nylon material or metal or rubber or plastic, the wear-resistant ring can further ensure the stable movement direction of the collision head, avoid direct scraping of the body of the collision head against the inner side wall of the stroke cavity, and the wear-resistant ring can have a higher friction life, extending the service life of the door bumper.

[0017] In the above energy-absorbing bulletproof and anti-bouncing door bumper, the inner sidewall of the stroke cavity has a flared section in the shape of a horn, and the end of the flared section close to the bottom of the seat body is the large end. By setting the inner sidewall of the stroke cavity to be in the shape of a horn and the end close to the bottom of the seat body to be the large end, when the collision head slides into the seat body, an air passage can be gradually formed between the edge of the sealing ring and the sidewall in the stroke cavity. At this time, the air in the stroke cavity can be easily discharged along the conical surface of the friction section, thereby ensuring the damping softness. In addition, when the collision head is impacted by the door body and slides into the seat body, the sidewall size of the flared section that restricts the expansion of the wear-resistant ring will become larger and larger. The rapid sliding process of the collision head and the expansion process of the wear-resistant ring will occur simultaneously, and there is no physical obstacle on the route of the wear-resistant ring, enabling it to move to the bottom of the stroke cavity before fully contacting the sidewall of the stroke cavity, greatly reducing the frictional resistance generated by it. Moreover, the sidewall of the stroke cavity has a smooth inclined transition, which can provide a guiding effect for the sliding of the wear-resistant ring, further reducing the resistance generated by the wear-resistant ring during this process. When the collision head is impacted by the door body and slides out of the seat body, the expanded wear-resistant ring will contract radially inward during the process of sliding along the sidewall of the stroke cavity. At this time, the wear-resistant ring is physically obstructed in the moving direction and cannot move quickly, and the acting force between the wear-resistant ring and the sidewall of the stroke cavity is also increasing, so that the frictional resistance between the wear-resistant ring and the sidewall of the stroke cavity is also increasing, effectively consuming the energy released by the damping member and greatly reducing the speed of the rebounding door body, thus avoiding the anti-bouncing phenomenon.

[0018] In the above energy-absorbing bulletproof and anti-bouncing door bumper, the wear-resistant ring has a fracture. By providing a fracture on the wear-resistant ring, the wear-resistant ring is similar to a piston ring. Through the fracture design, it can be ensured that the wear-resistant ring itself has a tendency to expand outward through elastic deformation, with a simple structure and facilitating the smooth passage of air.

[0019] In the above energy-absorbing bulletproof and anti-bouncing door bumper, a pre-compressed elastic member I is provided in the fracture, and both ends of the elastic member I are abutted against the two sidewalls of the fracture respectively. By providing the elastic member I in the fracture, the elastic member I can be a compression spring or a corrugated spring, etc. In this way, both ends of the elastic member I can abut against the two sidewalls of the fracture to increase the tendency of the wear-resistant ring to expand outward, ensuring the frictional acting force between the wear-resistant ring and the sidewall of the stroke cavity.

[0020] In the above energy-absorbing bulletproof and anti-bouncing door bumper, there are several fractures and elastic members I, and they are arranged at intervals along the circumferential direction of the wear-resistant ring. By providing several fractures and elastic members I, several elastic members I can act together to eject the wear-resistant ring radially outward, ensuring the acting force between the wear-resistant ring and the sidewall of the stroke cavity.

[0021] In the above energy-absorbing bulletproof door bumper, a spring member capable of driving the wear-resistant ring to expand radially is provided between the wear-resistant ring and the collision head. By providing a spring member between the wear-resistant ring and the collision head, the spring member can apply a force to the wear-resistant ring radially from the inner side of the wear-resistant ring, causing it to have a tendency to expand outward, further ensuring the frictional force between the wear-resistant ring and the side wall of the stroke cavity.

[0022] As another solution, the collision head includes a body portion and a wear-resistant ring. The outer peripheral surface of the middle section of the body portion has a circumferentially extending limiting ring groove. The wear-resistant ring is axially limited and fitted in the limiting ring groove. The wear-resistant ring has a through groove one that penetrates both axial sides of itself. The outer peripheral surface of the inner end of the body portion also has a circumferentially extending annular convex rib. When the sealing ring abuts against the wear-resistant ring, the through groove one forms the air passage. By providing a circumferentially extending limiting ring groove on the outer peripheral surface of the body portion of the collision head, the wear-resistant ring is axially limited and fitted in the limiting ring groove, and a circumferentially extending annular convex rib is provided on the outer peripheral surface of the inner end of the body portion. In this way, the sealing ring is limited to move between the annular convex rib and the wear-resistant ring. When the collision head moves towards the seat body, air can quickly flow out through the through groove one.

[0023] As another solution, the collision head includes a body portion and a wear-resistant ring. The outer peripheral surface of the body portion has a circumferentially extending limiting ring groove. The wear-resistant ring is located in the limiting ring groove. The wear-resistant ring has a through groove one that penetrates both sides. When the sealing ring abuts against the wear-resistant ring, the through groove one forms the air passage. By arranging the wear-resistant ring in the limiting ring groove and providing a through groove one on the wear-resistant ring, when the collision head slides towards the seat body, the sealing ring abuts against the wear-resistant ring, and the air in the accommodating cavity can enter the through groove one from the gap between the sealing ring and the body portion and finally be discharged to reduce the movement resistance.

[0024] As another solution, the collision head includes a body portion and a wear-resistant ring. The outer peripheral surface of the body portion has a circumferentially extending limiting ring groove. The body portion has a circumferentially extending annular convex rib. The wear-resistant ring is limited and sleeved on the annular convex rib. The wear-resistant ring can abut against the sealing ring. The wear-resistant ring has a through groove one that penetrates both axial sides of itself. When the sealing ring abuts against the wear-resistant ring, the through groove one forms the air passage. By arranging the wear-resistant ring to be sleeved outside the annular convex rib on the collision head and providing a through groove one that is connected and communicated on the wear-resistant ring, when the collision head slides towards the seat body, the sealing ring abuts against the wear-resistant ring, and the air in the accommodating cavity can enter the through groove one from the gap between the sealing ring and the body portion and finally be discharged to reduce the movement resistance.

[0025] In the above-mentioned energy-absorbing bulletproof anti-disengaging door bumper, the bottom of the seat body has a sunken groove communicating with the stroke cavity. The bottom of the sunken groove has an annular step surface. A limiting piece is hermetically abutted on the step surface. The limiting piece has a through hole communicating with the stroke cavity. An annular pressing column for limiting the position of the limiting piece is screwed and fitted in the sunken groove. By providing a sunken groove at the bottom of the seat body and hermetically abutting a limiting piece on the step surface at the bottom of the sunken groove, the limiting piece can be a rubber part, a metal part or a plastic part. A through hole is provided on the limiting piece, so that the air in the stroke cavity can enter and exit the outside through the through hole. The through hole can produce a certain flow-limiting effect, and the overall damping can be adjusted by adjusting the specification of the through hole.

[0026] In the above-mentioned energy-absorbing bulletproof anti-disengaging door bumper, the annular pressing column abuts against the limiting piece. A flow-limiting piece covering the through hole is arranged in the inner cavity of the annular pressing column. The flow-limiting piece has micro air holes communicating with the outside and the stroke cavity. The outer diameter of the flow-limiting piece is smaller than the inner diameter of the inner cavity of the annular pressing column. The flow-limiting piece can reciprocate between the annular pressing column and the limiting piece. A flow-limiting piece with micro air holes is arranged between the annular pressing column and the limiting piece. The flow-limiting piece is a metal part, a rubber part or a plastic part, and the outer diameter of the flow-limiting piece is smaller than the inner diameter of the sunken groove. When the collision head slides outward relative to the seat body, the negative pressure in the stroke cavity adsorbs the flow-limiting piece to the edge of the through hole, so that the outside air can basically only enter through the micro air holes, thereby increasing the movement resistance of the collision head. When the collision head slides inward relative to the seat body, the flow-limiting piece moves and opens the through hole, so that the air in the stroke cavity can be discharged from the gap around the flow-limiting piece, reducing the movement resistance of the collision head and ensuring the energy-absorbing effect.

[0027] As another solution, the inner side wall of the through hole is in a horn shape and the end close to the bottom of the seat body is the large end. An annular elastic sealing ring is embedded on the side surface of the limiting piece facing the flow-limiting piece. The elastic sealing ring is arranged around the outer edge of the through hole. The flow-limiting piece can abut against the elastic sealing ring. By setting the inner side wall of the through hole to be in a horn shape and the end close to the bottom of the seat body to be the large end, the communication effect between the micro air holes and the through hole can be better ensured when the flow-limiting piece moves radially. In addition, the small end of the through hole can also have a certain flow-limiting effect. When the impact force of the door body is large, it can ensure that the collision head still receives a certain resistance, avoiding that it is difficult to fully absorb the energy when the impact force is large and affecting the service life. By embedding an elastic sealing ring on the limiting piece, the elastic sealing ring is arranged around the periphery of the edge of the through hole. When the collision head moves outward and the flow-limiting piece is adsorbed to the through hole, the flow-limiting piece can abut against and seal with the elastic sealing ring, so that the outside air can only enter through the micro air holes. And in this way, the flow-limiting piece can adopt a higher hardness material, which is convenient for processing and cost control.

[0028] As another solution, a flow-limiting sheet covering the through hole is disposed between the annular pressing post and the limiting sheet, and the flow-limiting sheet is provided with micro air holes communicating the outside and the stroke cavity. The annular pressing post presses the flow-limiting sheet tightly, so that the outside air can only enter through the micro air holes, ensuring the damping effect.

[0029] As another solution, a flow-limiting sheet covering the through hole is provided between the annular pressing post and the limiting sheet. The flow-limiting sheet is a soft material piece and is provided with micro air holes communicating the outside and the stroke cavity. The outer diameter dimension of the flow-limiting sheet is smaller than the inner diameter dimension of the sinking groove. An annular snap spring piece is disposed between the flow-limiting sheet and the annular pressing post in a butting manner, and the snap spring piece is provided with a yielding notch. A flow-limiting sheet with micro air holes is provided between the annular pressing post and the limiting sheet, making the outer diameter dimension of the flow-limiting sheet smaller than the inner diameter dimension of the sinking groove, and a snap spring piece is arranged to butt against the flow-limiting sheet. In this way, when the collision head slides outward relative to the seat body, the flow-limiting sheet is pressed by the snap spring piece against the edge of the through hole, so that the outside air can basically only enter through the micro air holes, thereby increasing the movement resistance of the collision head. When the collision head slides inward relative to the seat body, the part of the flow-limiting sheet facing the notch of the snap spring piece can be pressed to deform and warp outward, thereby forming an exhaust and air passage to discharge the air in the stroke cavity and reducing the movement resistance of the collision head to ensure the energy absorption effect.

[0030] As another solution, a flow-limiting sheet covering the through hole is provided between the annular pressing post and the limiting sheet. The flow-limiting sheet is a soft material piece and is provided with micro air holes communicating the outside and the stroke cavity. The outer diameter dimension of the flow-limiting sheet is smaller than the inner diameter dimension of the sinking groove. A pressing ring is disposed between the flow-limiting sheet and the annular pressing post in a butting manner, and the side of the pressing ring facing the flow-limiting sheet is provided with a plurality of abutting claws arranged at intervals in the circumferential direction. A flow-limiting sheet with micro air holes is provided between the annular pressing post and the limiting sheet, making the outer diameter dimension of the flow-limiting sheet smaller than the inner diameter dimension of the sinking groove, and a pressing ring is arranged to butt against the flow-limiting sheet. In this way, when the collision head slides outward relative to the seat body, the flow-limiting sheet is pressed by the pressing ring against the edge of the through hole, so that the outside air can basically only enter through the micro air holes, thereby increasing the movement resistance of the collision head. When the collision head slides inward relative to the seat body, the part of the flow-limiting sheet facing the interval area of the abutting claws on the pressing ring can be pressed to deform and warp outward, thereby forming an exhaust and air passage to discharge the air in the stroke cavity and reducing the movement resistance of the collision head to ensure the energy absorption effect.

[0031] As another solution, a flow-limiting sheet capable of covering the through hole is provided in the inner cavity of the annular pressing column. The flow-limiting sheet is provided with micro air holes communicating the outside and the stroke cavity. The outer diameter of the flow-limiting sheet is smaller than the inner diameter of the inner cavity of the annular pressing column. An elastic member III is connected to the bottom of the flow-limiting sheet and can press the flow-limiting sheet against the periphery of the through hole. A flow-limiting sheet with micro air holes is provided between the annular pressing column and the bottom surface of the sinking groove, so that the outer diameter of the flow-limiting sheet is smaller than the inner diameter of the inner cavity of the annular pressing column, and an elastic member III is arranged at the bottom of the flow-limiting sheet to press the flow-limiting sheet against the edge of the through hole. When the collision head slides outward relative to the seat body, the outside air can basically only enter from the micro air holes, thereby increasing the movement resistance of the collision head. When the collision head slides inward relative to the seat body, the flow-limiting sheet is stressed to drive the elastic member III to compress and open the blocked through hole, so that the air in the stroke cavity can be smoothly discharged, reducing the movement resistance of the collision head and ensuring the energy absorption effect. Preferably, the elastic member III is a tower-shaped compression spring and the large end of the tower-shaped compression spring faces the flow-limiting sheet to improve the pressing effect.

[0032] As another solution, the inner side wall of the through hole is in a horn shape and the end close to the bottom of the seat body is the large end. A plug capable of blocking the through hole is provided in the inner cavity of the annular pressing column. The shape of the plug is adapted to the shape of the through hole. The plug is provided with micro air holes communicating the outside and the stroke cavity. An elastic member III is connected to the bottom of the plug and can press the plug in the through hole. In this way, when the collision head slides inward relative to the seat body, the plug is stressed to drive the elastic member III to compress and open the blocked through hole, so that the air in the stroke cavity can be smoothly discharged, reducing the movement resistance of the collision head and ensuring the energy absorption effect. When the collision head slides outward relative to the seat body, the plug remains in the through hole to control the air flow and ensure the damping energy absorption effect.

[0033] In the above-mentioned energy-absorbing and bullet-proof door stopper, the inner cavity of the annular pressing column is provided with a dust filtering member, and the dust filtering member is a filter screen or a sintered particle filter sheet or a pressed filter sheet or a filter cloth. By arranging a dust filtering member in the inner cavity of the annular pressing column, the dust filtering member can be a filter screen or a sintered particle filter sheet or a pressed filter sheet or a filter cloth, so that dust and impurities entering the door stopper during operation can be filtered to avoid blocking the micro air holes.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] This energy-absorbing bulletproof door stopper is provided with a sealing ring sleeved around the periphery of the collision head. When the collision head slides outward relative to the seat body, the sealing ring seals and abuts between the collision head and the inner wall of the stroke cavity. When the collision head slides inward relative to the seat body, an air passage communicating the outside with the stroke cavity is formed between the sealing ring and the collision head or the inner wall of the stroke cavity. In this way, when the door body impacts the collision head and is attracted and combined by the arranged magnet, the air in the stroke cavity can be smoothly discharged along the air passage, making the buffer damping received by the door body relatively soft, extending the buffer stroke of the door body and ensuring that it will not rebound in advance. When the damping member starts to release the absorbed energy and pushes the collision head to drive the door body to start moving outward, the sealing ring seals and abuts between the collision head and the inner wall of the stroke cavity. In this way, a relatively low negative pressure is formed in the stroke cavity, increasing the movement resistance of the collision head, thereby effectively consuming the energy released by the damping member, and controlling the speed of the door body rebounding to the in-place position with the collision head within the restraint range of the magnetic attracting member, thus effectively preventing the door body from rebounding and breaking free. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a three-dimensional structural schematic diagram of Embodiment 1.

[0037] Figure 2 is a cross-sectional structural schematic diagram of Embodiment 1.

[0038] Figure 3 is a three-dimensional structural schematic diagram of the sealing ring in Embodiment 1.

[0039] Figure 4 is a cross-sectional structural schematic diagram of the air ventilation state of the sealing ring in Embodiment 1.

[0040] Figure 5 is Figure 4 the enlarged view of Part A in

[0041] Figure 6 is Figure 4 the enlarged view of Part B in

[0042] Figure 7 is a cross-sectional structural schematic diagram of Embodiment 2.

[0043] Figure 8 is Figure 7 the enlarged view of Part C in

[0044] Figure 9 is Figure 7 the enlarged view of Part D in

[0045] Figure 10 is a three-dimensional structural schematic diagram of the sealing ring in Embodiment 2.

[0046] Figure 11 is a top-view structural schematic diagram of the wear-resistant ring and the first elastic member in Embodiment 2.

[0047] Figure 12 It is a schematic cross-sectional structure diagram of the third embodiment.

[0048] Figure 13 It is Figure 12 an enlarged view of part E in

[0049] Figure 14 It is Figure 12 an enlarged view of part F in

[0050] Figure 15 It is a schematic top view structure diagram of the wear-resistant ring and the first elastic member in the third embodiment.

[0051] Figure 16 It is a schematic cross-sectional structure diagram of the fourth embodiment.

[0052] Figure 17 It is Figure 16 an enlarged view of part G in

[0053] Figure 18 It is Figure 16 an enlarged view of part H in

[0054] Figure 19 It is a three-dimensional structure diagram of the wear-resistant ring in the fourth embodiment.

[0055] Figure 20 It is a schematic cross-sectional structure diagram of the fifth embodiment.

[0056] Figure 21 It is Figure 20 an enlarged view of part I in

[0057] Figure 22 It is a three-dimensional structure diagram of the wear-resistant ring in the fifth embodiment.

[0058] Figure 23 It is a schematic cross-sectional structure diagram of the sixth embodiment.

[0059] Figure 24 It is Figure 23 an enlarged view of part J in

[0060] Figure 25 It is Figure 23 an enlarged view of part K in

[0061] Figure 26 It is a schematic cross-sectional structure diagram of the seventh embodiment.

[0062] Figure 27 It is Figure 26 an enlarged view of part L in

[0063] In the figure, 1 is the seat body; 11 is the sinking groove; 111 is the step surface; 12 is the limiting piece; 121 is the through hole.

[0064] 2. Collision head; 21. Limiting ring groove; 22. Support teeth; 23. Annular convex rib; 24. Limiting section; 25. Second elastic member; 26. Body part;

[0065] 3. Stroke cavity; 31. Flared section; 4. Damping member;

[0066] 5. Sealing ring; 51. Friction section; 52. Relief groove; 53. Support rib; 54. Support block;

[0067] 6. Air passage;

[0068] 7. Wear-resistant ring; 71. First through groove; 72. Fracture; 73. First elastic member;

[0069] 8. Annular pressing column;

[0070] 9. Current-limiting sheet; 91. Microscopic air holes;

[0071] 10. Snap ring part; 100. Relief fracture;

[0072] 101. Pressing ring; 1011. Claw;

[0073] 102. Third elastic member; 103. Dust filter member; 104. Spring member; 105. Plug; 106. Elastic sealing ring. Specific embodiments

[0074] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0075] Embodiment 1:

[0076] As Figures 1-5As shown in the figure, the energy-absorbing bulletproof door stopper includes a seat body 1 and a columnar collision head 2. There is a stroke cavity 3 inside the seat body 1. The inner end of the collision head 2 is slidably fitted inside the stroke cavity 3. The stroke cavity 3 communicates with the outside through the fitting gap between the collision head 2 and the seat body 1. A damping member 4 is provided between the inner end of the collision head 2 and the seat body 1 to prevent the collision head 2 from sliding into the seat body 1. A sealing ring 5 is sleeved around the outer periphery of the collision head 2. Damping oil or lubricating oil is applied between the sealing ring 5 and the side wall of the stroke cavity 3 to make the work more stable. When the collision head 2 slides out of the seat body 1, the sealing ring 5 seals and abuts between the collision head 2 and the inner side wall of the stroke cavity 3. When the collision head 2 slides into the seat body 1, a through-air channel 6 can be formed between the sealing ring 5 and the collision head 2 or the inner side wall of the stroke cavity 3, and the chambers of the stroke cavity 3 on both sides of the sealing ring 5 are connected. The seat body 1 is used to be fixed on the ground, wall or door body. The collision head 2 and the seat body 1 cooperate to axially slide within the range of the stroke cavity 3. Existing collision heads 2 are provided with magnetic components such as magnets to cooperate with matching suction seats. A damping member 4 is provided between the inner end of the collision head 2 and the seat body 1. The damping member 4 can be a damping rod or a compression spring, etc., which can buffer the collision head 2. By sleeving a sealing ring 5 around the outer periphery of the collision head 2, when the collision head 2 slides out of the seat body 1, the sealing ring 5 seals and abuts between the collision head 2 and the inner side wall of the stroke cavity 3, and when the collision head 2 slides into the seat body 1, a through-air channel 6 that connects the chambers of the stroke cavity 3 on both sides of the sealing ring 5 is formed between the sealing ring 5 and the collision head 2 or the inner side wall of the stroke cavity 3. In this way, when the door body impacts the collision head 2 and is attracted by the set magnet, the air in the stroke cavity 3 can be smoothly discharged along the through-air channel 6, making the buffer damping received by the door body softer, extending the buffer stroke of the door body and ensuring that it will not rebound in advance. When the damping member 4 starts to release the absorbed energy and pushes the collision head 2 to drive the door body to start moving outwards, the sealing ring 5 seals and abuts between the collision head 2 and the inner side wall of the stroke cavity 3. In this way, a lower negative pressure is formed in the stroke cavity 3, increasing the movement resistance of the collision head 2, thereby effectively consuming the energy released by the damping member 4, and thus controlling the speed of the door body rebounding with the collision head 2 in place within the restraint range of the magnetic component, effectively avoiding the door body rebounding and breaking free. Further, the outer edge surface of the sealing ring 5 has a friction section 51 extending in the circumferential direction. The outer edge of the friction section 51 abuts against the inner side wall of the stroke cavity 3. The outer edge surface of the friction section 51 is conical, and the end close to the outer end of the collision head 2 is the large end.By providing a friction section 51 extending circumferentially on the outer edge surface of the sealing ring 5, the outer edge surface of the friction section 51 is conical with the larger end closer to the outer end of the collision head 2. In this way, when the collision head 2 slides into the seat body 1, the edge of the larger end of the friction section 51 is squeezed by the air in the stroke cavity 3 and can deform to form an air passage 6 with the side wall in the stroke cavity 3. At this time, the air in the stroke cavity 3 can easily escape along the conical surface of the friction section 51, thus ensuring the damping softness. When the collision head 2 slides out of the seat body 1, a negative pressure is formed in the stroke cavity 3, causing the outside air to deform the larger end of the friction section 51 radially outwards under the pressure of the outside air, so that it closely adheres to the inner side wall of the stroke cavity 3, thereby forming a seal and reducing the flow rate of the outside air entering the stroke cavity 3, thus ensuring the movement resistance of the collision head 2 during this process. Preferably, the sealing ring 5 is made of a soft material. On the side of the sealing ring 5 close to the outer end of the collision head 2, there is a circumferentially extending relief groove 52, and the relief groove 52 is radially aligned with the position of the friction section 51. By providing the sealing ring 5 as a soft material part, the deformation effect can be further ensured. By providing a circumferentially extending relief groove 52 on the side of the sealing ring 5 close to the outer end of the collision head 2, and making the relief groove 52 radially aligned with the position of the friction section 51, the relief groove 52 can provide sufficient relief space for the inward deformation of the friction section 51, making the air discharge smoother. In addition, when the stroke cavity 3 is under negative pressure, the outside air can fully enter the relief groove 52 to effectively expand the friction section 51 outwards, further ensuring the energy absorption effect. The outer edge surface of the sealing ring 5 also has a number of support ribs 53 arranged at intervals circumferentially in sequence, and the support ribs 53 abut against the inner side wall of the stroke cavity 3. By providing a number of support ribs 53 on the outer edge surface of the sealing ring 5 to abut against the inner side wall of the stroke cavity 3, during the sliding process of the collision head 2, the support ribs 53 can ensure the stable movement position of the collision head 2 and reduce the direct scraping and wear between the collision head 2 and the inner side wall of the stroke cavity 3. The outer peripheral surface of the collision head 2 has a circumferentially extending limit ring groove 21, and the sealing ring 5 is embedded in the limit ring groove 21. By providing a limit ring groove 21 on the outer peripheral surface of the collision head 2 and embedding the sealing ring 5 in the limit ring groove 21, the sealing ring 5 can be restricted by the side wall of the limit ring groove 21 during the movement with the collision head 2, ensuring stable energy absorption.

[0077] As Figure 2 , Figure 4 , Figure 6As shown in the figure, the bottom of the seat body 1 has a sunk groove 11 communicating with the stroke cavity 3. The bottom of the sunk groove 11 has an annular step surface 111. A limiting piece 12 is hermetically abutted and arranged on the step surface 111. The limiting piece 12 is a rubber part. The bottom surface of the sunk groove 11 has an annular groove. The limiting piece 12 has a convex rib matching the shape of the annular groove, and the two are matched to increase the sealing area. The limiting piece 12 has a through hole 121 communicating with the stroke cavity 3. An annular pressing column 8 is screwed and matched in the sunk groove 11. A current-limiting piece 9 capable of covering the through hole 121 is arranged between the annular pressing column 8 and the bottom surface of the sunk groove 11. The current-limiting piece 9 has a micro air hole 91 (not shown) communicating with the outside and the stroke cavity 3. The outer diameter dimension of the current-limiting piece 9 is smaller than the inner diameter dimension of the sunk groove 11. The current-limiting piece 9 can reciprocate between the annular pressing column 8 and the bottom surface of the sunk groove 11. By arranging the sunk groove 11 at the bottom of the seat body 1 and arranging the through hole 121 at the bottom of the sunk groove 11, the air in the stroke cavity 3 can enter and exit the outside through the through hole 121. By arranging the annular pressing column 8, a current-limiting piece 9 with a micro air hole 91 is arranged between the annular pressing column 8 and the bottom surface of the sunk groove 11. The current-limiting piece 9 is a metal part or a rubber part or a plastic part. The outer diameter dimension of the current-limiting piece 9 is smaller than the inner diameter dimension of the sunk groove 11. When the collision head 2 slides outward relative to the seat body 1, the negative pressure in the stroke cavity 3 adsorbs the current-limiting piece 9 to the edge of the through hole 121, so that the outside air can basically only enter from the micro air hole 91, thereby increasing the movement resistance of the collision head 2. When the collision head 2 slides inward relative to the seat body 1, the current-limiting piece 9 moves and opens the through hole 121, so that the air in the stroke cavity 3 can be discharged from the gap around the current-limiting piece 9, reducing the movement resistance of the collision head 2 and ensuring the energy absorption effect. The inner side wall of the through hole 121 is in a horn shape, and the end close to the bottom of the seat body 1 is the large end. By arranging the inner side wall of the through hole 121 in a horn shape and the end close to the bottom of the seat body 1 being the large end, when the current-limiting piece 9 moves radially, the communication effect between the micro air hole 91 and the through hole 121 can be better ensured. Preferably, the inner cavity of the annular pressing column 8 has a dust filtering part 103. The dust filtering part 103 is a filter screen or a sintered particle filter sheet or a pressed filter sheet. By arranging the dust filtering part 103 in the inner cavity of the annular pressing column 8, the dust filtering part 103 can be a filter screen or a sintered particle filter sheet or a pressed filter sheet or a filter cloth, so that the dust and impurities entering the door bumper during the operation of the door bumper can be filtered, avoiding blocking the micro air hole 91.

[0078] Embodiment 2:

[0079] As Figures 7-11As shown, this embodiment is basically the same as the first embodiment, with the difference being that: the outer peripheral surface of the collision head 2 has a limiting ring groove 21 extending circumferentially. The sealing ring 5 is located within the limiting ring groove 21 and can reciprocate axially along the collision head 2. The sealing ring 5 is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity 3. On one side of the sealing ring 5 close to the outer end of the collision head 2, there are a number of support blocks 54 arranged at intervals circumferentially. When the support blocks 54 abut against the inner side wall of the limiting ring groove 21, the space between two adjacent support blocks 54 forms a gas passage 6. By providing a circumferentially extending limiting ring groove 21 on the outer peripheral surface of the collision head 2, the sealing ring 5 is located within the limiting ring groove 21 and can reciprocate axially along the collision head 2. The sealing ring 5 is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity 3. On one side of the sealing ring 5 close to the outer end of the collision head 2, a number of support blocks 54 are arranged at intervals circumferentially. In this way, when the collision head 2 slides into the seat body 1, the support blocks 54 on the sealing ring 5 abut against the inner side wall of the limiting ring groove 21, and the space between two adjacent support blocks 54 forms a gas passage 6, reducing the movement resistance of the collision head 2. When the collision head 2 slides out of the seat body 1, the other side of the sealing ring 5 can be in sealing contact with the inner side wall of the limiting ring groove 21, increasing the movement resistance of the collision head 2. An axially limited wear-resistant ring 7 is also sleeved around the collision head 2. The wear-resistant ring 7 is made of POM material or nylon material or metal or rubber or plastic. The wear-resistant ring 7 always has a tendency to expand radially outward along the collision head 2 and abuts against the inner side wall of the stroke cavity 3. The inner side wall of the stroke cavity 3 has a flared section 31 in the shape of a horn, and the end of the flared section 31 close to the bottom of the seat body 1 is the large end. The wear-resistant ring 7 has a break 72. A pre-compressed elastic member 73 is provided within the break 72, and both ends of the elastic member 73 abut against the two side walls of the break 72 respectively.

[0080] As Figure 7 , Figure 9 shown, a ring-shaped snap spring member 10 is abutted between the current-limiting piece 9 and the annular pressing post 8. The snap spring member 10 has a relief break 100. When the collision head 2 slides into the seat body 1, the part of the current-limiting piece 9 opposite to the break of the snap spring member 10 can be pressed to deform and warp outward, thereby forming an exhaust gas passage 6 to discharge the air in the stroke cavity 3, reducing the movement resistance of the collision head 2 and ensuring the energy absorption effect.

[0081] Embodiment Three:

[0082] As Figures 12-15As shown, this embodiment is basically the same as the second embodiment, except that: the side wall of the limiting ring groove 21 near the outer end of the collision head 2 has a plurality of supporting teeth 22, and when the sealing ring 5 abuts against the supporting teeth 22, the space between the two adjacent supporting teeth 22 forms an air passage 6. By providing the limiting ring groove 21 extending in the circumferential direction on the outer peripheral surface of the collision head 2, the sealing ring 5 is located in the limiting ring groove 21 and can reciprocate along the axial direction of the collision head 2, and the sealing ring 5 is a soft material part and the outer edge is sealed against the inner side wall of the stroke chamber 3, and the side wall of the limiting ring groove 21 near the outer end of the collision head 2 has a plurality of supporting teeth 22, so that when the collision head 2 slides toward the inside of the seat body 1, the supporting teeth 22 abut against the sealing ring 5, so that the space between the two adjacent supporting teeth 22 forms an air passage 6, reducing the movement resistance of the collision head 2, and when the collision head 2 slides toward the outside of the seat body 1, the other side of the sealing ring 5 can be sealed against the inner side wall of the limiting ring groove 21, increasing the movement resistance of the collision head 2. There are two fractures 72 and two elastic members 73 , which are arranged at intervals along the circumference of the wear-resistant ring 7 .

[0083] like Figure 12 , Figure 14 As shown, a pressure ring 101 is provided between the flow limiting plate 9 and the annular pressure column 8, and the pressure ring 101 has a plurality of claws 1011 arranged at intervals along the circumferential direction on the side facing the flow limiting plate 9. When the collision head 2 slides into the seat body 1, the portion of the flow limiting plate 9 that is opposite to the interval area between the claws 1011 on the pressure ring 101 can be pressed and tilted toward the outer shape, thereby forming an exhaust passage 6 to discharge the air in the stroke chamber 3, reducing the movement resistance of the collision head 2 and ensuring the energy absorption effect.

[0084] Embodiment 4:

[0085] like Figures 16-19 As shown, this embodiment is basically the same as the second embodiment, except that: the collision head 2 includes a main body 26 and a wear-resistant ring 7, the middle section outer peripheral surface of the main body 26 has a limiting ring groove 21 extending in the circumferential direction, the wear-resistant ring 7 is limitedly fitted in the limiting ring groove 21 along its own axial direction, the wear-resistant ring 7 has a through groove 71 passing through both sides of its own axial direction, the inner end outer peripheral surface of the main body 26 also has an annular convex ridge 23 extending in the circumferential direction, the sealing ring 5 is located between the annular convex ridge 23 and the wear-resistant ring 7 along the axial direction of the collision head 2 and can reciprocate along the axial direction of the collision head 2; the outer edge of the wear-resistant ring 7 has a through groove 71 passing through both sides of its own axial direction, and when the collision head 2 slides toward the seat body 1, the through groove 71 can be connected with the inner space of the wear-resistant ring 7 to form an air passage 6.

[0086] like Figure 16 , Figure 18As shown, an elastic member three 102 is connected to the bottom of the current-limiting piece 9, and the elastic member three 102 can press the current-limiting piece 9 against the periphery of the through-hole 121. When the collision head 2 slides into the seat body 1, the current-limiting piece 9 is stressed to drive the elastic member three 102 to compress and open the shielded through-hole 121, so that the air in the stroke cavity 3 can be smoothly discharged, reducing the movement resistance of the collision head 2 and ensuring the energy absorption effect. Preferably, the elastic member three 102 is a tower-shaped compression spring and the large end of the tower-shaped compression spring faces the current-limiting piece 9 to improve the pressing effect. An annular elastic sealing ring 106 is embedded in the side surface of the limiting piece 12 facing the current-limiting piece 9, and the elastic sealing ring 106 is arranged around the outer edge of the through-hole 121, and the current-limiting piece 9 can abut against the elastic sealing ring 106.

[0087] Embodiment Five:

[0088] As Figures 20-22 shown, this embodiment is basically the same as Embodiment Four, except that: the collision head 2 has an annular convex rib 23 extending circumferentially, the wear-resistant ring 7 is sleeved on the annular convex rib 23 in a limited way, the wear-resistant ring 7 can abut against the sealing ring 5, and a through-channel one 71 penetrating both side surfaces is formed on the outer edge of the wear-resistant ring 7. When the collision head 2 slides into the seat body 1, the through-channel one 71 forms a gas passage 6. A spring member 104 that can drive the wear-resistant ring 7 to expand radially is provided between the wear-resistant ring 7 and the collision head 2.

[0089] Embodiment Six:

[0090] As Figures 23-25 shown, this embodiment is basically the same as Embodiment One, except that: the outer peripheral surface of the collision head 2 has a limiting ring groove 21 extending circumferentially, the part of the collision head 2 opposite to the limiting ring groove 21 forms a limiting section 24, the limiting section 24 is conical and the end close to the inner end of the collision head 2 is the large end, the sealing ring 5 is sleeved around the periphery of the limiting section 24 in a ring shape and the inner diameter of the sealing ring 5 is smaller than the diameter of the large end of the limiting section 24. When the collision head 2 slides outwards relative to the seat body 1, the sealing ring 5 can move to the large end of the limiting section 24 and abut against the side wall of the stroke cavity 3 radially. An elastic member two 25 is also sleeved around the small end of the limiting section 24, and the elastic member two 25 always has a tendency to push the sealing ring 5 axially to the large end of the limiting section 24. A plug 105 that can block the through-hole 121 is provided in the inner cavity of the annular pressing column 8, the shape of the plug 105 is adapted to the shape of the through-hole 121, a micro air hole 91 communicating with the outside and the stroke cavity 3 is provided on the plug 105, and an elastic member three 102 that can press the plug 105 in the through-hole 121 is connected to the bottom of the plug 105.

[0091] Embodiment Seven:

[0092] As Figure 26 、 Figure 27As shown, this embodiment is basically the same as the fourth embodiment, except that: the collision head 2 includes a body portion 26 and a wear-resistant ring 7. The outer peripheral surface of the body portion 26 has a limiting ring groove 21 extending circumferentially. The wear-resistant ring 7 is located in the limiting ring groove 21. A first through groove 71 penetrating both axial side surfaces of the wear-resistant ring 7 is provided on the outer edge of the wear-resistant ring 7. When the sealing ring 5 abuts against the wear-resistant ring 7 and the collision head 2 slides into the seat body 1, the first through groove 71 forms an air passage 6. A current-limiting sheet 9 covering the through hole 121 is provided between the annular pressing column 8 and the limiting sheet 12, and the current-limiting sheet 9 has micro air holes 91 communicating with the outside and the stroke cavity 3.

[0093] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An energy-absorbing bulletproof and detachable door bumper, comprising a seat body (1) and a collision head (2). A stroke cavity (3) is provided inside the seat body (1). The inner end of the collision head (2) is slidably fitted inside the stroke cavity (3), and the stroke cavity (3) communicates with the outside. A damping member (4) is provided between the inner end of the collision head (2) and the seat body (1) to prevent the collision head (2) from sliding into the seat body (1). It is characterized in that, A sealing ring (5) is sleeved on the periphery of the collision head (2). When the collision head (2) slides outward relative to the seat body (1), the sealing ring (5) is hermetically abutted between the collision head (2) and the inner side wall of the stroke cavity (3). When the collision head (2) slides inward relative to the seat body (1), an air passage (6) can be formed between the sealing ring (5) and the inner side wall of the collision head (2) or the stroke cavity (3), and the chambers of the stroke cavity (3) on both sides of the sealing ring (5) are communicated with each other.

2. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The outer edge surface of the sealing ring (5) has a friction section (51) extending circumferentially. The outer edge of the friction section (51) abuts against the inner side wall of the stroke cavity (3). The outer edge surface of the friction section (51) is conical, and the end close to the outer end of the collision head (2) is the large end.

3. The energy-absorbing bulletproof and detachable door bumper according to claim 2, characterized in that, The sealing ring (5) is made of a soft material. A relief groove (52) extending circumferentially is provided on one side of the sealing ring (5) close to the outer end of the collision head (2). The relief groove (52) is radially aligned with the position of the friction section (51).

4. The energy-absorbing bulletproof and detachable door bumper according to claim 3, characterized in that, The outer edge surface of the sealing ring (5) also has a number of support ribs (53) arranged at intervals in the circumferential direction. The support ribs (53) abut against the inner side wall of the stroke cavity (3).

5. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The outer peripheral surface of the collision head (2) has a limiting ring groove (21) extending circumferentially. The part of the collision head (2) opposite to the limiting ring groove (21) forms a limiting section (24). The limiting section (24) is conical, and the end close to the inner end of the collision head (2) is the large end. The sealing ring (5) is sleeved around the periphery of the limiting section (24), and the inner diameter of the sealing ring (5) is smaller than the diameter of the large end of the limiting section (24). When the collision head (2) slides outward relative to the seat body (1), the sealing ring (5) can move to the large end of the limiting section (24) and abut against the side wall of the stroke cavity (3) in the radial direction.

6. The energy-absorbing bulletproof and detachable door bumper according to claim 5, characterized in that, A second elastic member (25) is also sleeved around the small end of the limiting section (24). The second elastic member (25) always has a tendency to axially push the sealing ring (5) to the large end of the limiting section (24).

7. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The outer peripheral surface of the collision head (2) has a limiting ring groove (21) extending circumferentially. The sealing ring (5) is located in the limiting ring groove (21) and can reciprocate axially along the collision head (2). The sealing ring (5) is made of a soft material, and its outer edge is hermetically abutted against the inner side wall of the stroke cavity (3). A number of support blocks (54) arranged at intervals in the circumferential direction are provided on one side of the sealing ring (5) close to the outer end of the collision head (2). When the support blocks (54) abut against the inner side wall of the limiting ring groove (21), the space between two adjacent support blocks (54) forms the air passage (6).

8. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The outer peripheral surface of the collision head (2) is provided with a limiting ring groove (21) extending circumferentially. The sealing ring (5) is located in the limiting ring groove (21) and can reciprocate axially along the collision head (2). The friction member of the sealing ring (5) is made of a soft material, and its outer edge is in sealing contact with the inner side wall of the stroke cavity (3). One side wall of the limiting ring groove (21) close to the outer end of the collision head (2) is provided with a plurality of support teeth (22). When the sealing ring (5) abuts against the support teeth (22), the space between two adjacent support teeth (22) forms the air passage (6).

9. The energy-absorbing bulletproof and detachable door bumper according to claim 5 or 6 or 7 or 8, characterized in that, A wear-resistant ring (7) is also sleeved outside the collision head (2). The wear-resistant ring (7) is made of POM material, or nylon material, or metal, or rubber, or plastic. The wear-resistant ring (7) always has a tendency to expand radially outward along the collision head (2) and abuts against the inner side wall of the stroke cavity (3).

10. The energy-absorbing bulletproof and detachable door bumper according to claim 9, characterized in that, The inner side wall of the stroke cavity (3) has a flared section (31) in a horn shape. The end of the flared section (31) close to the bottom of the seat body (1) is the large end.

11. The energy-absorbing bulletproof and detachable door bumper according to claim 9, characterized in that, The wear-resistant ring (7) has a fracture (72).

12. The energy-absorbing bulletproof and detachable door bumper according to claim 11, characterized in that, A pre-compressed first elastic member (73) is arranged in the fracture (72). The two ends of the first elastic member (73) respectively abut against the two side walls of the fracture (72).

13. The energy-absorbing bulletproof and detachable door bumper according to claim 12, characterized in that, There are a plurality of the fractures (72) and the first elastic members (73), and they are arranged at intervals along the circumference of the wear-resistant ring (7).

14. The energy-absorbing bulletproof and detachable door bumper according to claim 9, characterized in that, A spring member (104) capable of driving the wear-resistant ring (7) to expand radially is arranged between the wear-resistant ring (7) and the collision head (2).

15. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The collision head (2) includes a body portion (26) and a wear-resistant ring (7). The middle section of the outer peripheral surface of the body portion (26) is provided with a limiting ring groove (21) extending circumferentially. The wear-resistant ring (7) is axially limited and fitted in the limiting ring groove (21). The wear-resistant ring (7) has a through groove one (71) penetrating both axial sides of itself. The inner end outer peripheral surface of the body portion (26) is also provided with a circumferentially extending annular rib (23). The sealing ring (5) is axially located between the annular rib (23) and the wear-resistant ring (7) along the collision head (2). When the sealing ring (5) abuts against the wear-resistant ring (7), the through groove one (71) forms the air passage (6).

16. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The collision head (2) includes a body portion (26) and a wear-resistant ring (7). The outer peripheral surface of the body portion (26) is provided with a limiting ring groove (21) extending circumferentially. The wear-resistant ring (7) is located in the limiting ring groove (21). The wear-resistant ring (7) has a through groove one (71) penetrating both axial sides of itself. When the sealing ring (5) abuts against the wear-resistant ring (7), the through groove one (71) forms the air passage (6).

17. The energy-absorbing bulletproof and detachable door bumper according to claim 1, characterized in that, The collision head (2) comprises a main body (26) and a wear-resistant ring (7); the outer peripheral surface of the main body (26) has a limiting ring groove (21) extending in the circumferential direction; the main body (26) has an annular convex ridge (23) extending in the circumferential direction; the wear-resistant ring (7) is limitedly sleeved on the annular convex ridge (23); the wear-resistant ring (7) can abut against the sealing ring (5); the wear-resistant ring (7) has a through groove (71) penetrating through both sides of the wear-resistant ring (7) in the axial direction; when the sealing ring (5) abuts against the wear-resistant ring (7), the through groove (71) forms the channel (6).

18. The energy-absorbing bulletproof detachable door bumper according to claim 15 or 16 or 17, characterized in that The inner side wall of the stroke chamber (3) has a trumpet-shaped expansion section (31), and the end of the expansion section (31) close to the bottom of the seat body (1) is a large end. The wear-resistant ring (7) always has a tendency to expand outward along the radial direction of the collision head (2) and abuts against the inner side wall of the stroke chamber (3).

19. The energy-absorbing bulletproof detachable door bumper according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 15 or 16 or 17, characterized in that The bottom of the seat body (1) has a recessed groove (11) connected to the stroke chamber (3), the bottom of the recessed groove (11) has an annular step surface (111), a limit plate (12) is provided on the step surface (111) for sealing against the limit plate (12), the limit plate (12) has a through hole (121) connected to the stroke chamber (3), and an annular pressure column (8) for limiting the position of the limit plate (12) is threadedly engaged in the recessed groove (11).

20. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that The annular pressure column (8) is in contact with the limiting plate (12); the inner cavity of the annular pressure column (8) is provided with a flow limiting plate (9) capable of covering the through hole (121); the flow limiting plate (9) has a micro air hole (91) connecting the outside and the stroke cavity (3); the outer diameter of the flow limiting plate (9) is smaller than the inner diameter of the inner cavity of the annular pressure column (8); the flow limiting plate (9) can reciprocate between the annular pressure column (8) and the limiting plate (12).

21. The energy-absorbing bulletproof detachable door bumper according to claim 20, characterized in that The inner side wall of the through hole (121) is trumpet-shaped, and the end close to the bottom of the seat body (1) is the larger end. An annular elastic sealing ring (106) is embedded on the side of the limiting plate (12) facing the current limiting plate (9). The elastic sealing ring (106) is arranged around the outer edge of the through hole (121), and the current limiting plate (9) can be sealed against the elastic sealing ring (106).

22. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that A flow limiting plate (9) covering the through hole (121) is disposed between the annular pressure column (8) and the limiting plate (12), and the flow limiting plate (9) has micro air holes (91) communicating with the outside and the stroke chamber (3).

23. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that A flow limiting plate (9) covering the through hole (121) is provided between the annular pressure column (8) and the limiting plate (12); the flow limiting plate (9) is a soft material piece and has micro air holes (91) communicating with the outside and the stroke chamber (3); the outer diameter of the flow limiting plate (9) is smaller than the inner diameter of the sink (11); an annular retaining spring (10) is provided between the flow limiting plate (9) and the annular pressure column (8); the retaining spring (10) has a yielding fracture (100).

24. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that A flow-limiting sheet (9) covering the through hole (121) is provided between the annular pressing column (8) and the limiting sheet (12). The flow-limiting sheet (9) is made of a soft material and has micro air holes (91) communicating the outside and the stroke cavity (3). The outer diameter of the flow-limiting sheet (9) is smaller than the inner diameter of the sink (11). A pressing ring (101) is abutted between the flow-limiting sheet (9) and the annular pressing column (8), and a plurality of abutting claws (1011) arranged at intervals in the circumferential direction are provided on one side of the pressing ring (101) facing the flow-limiting sheet (9).

25. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that A flow-limiting sheet (9) capable of covering the through hole (121) is provided in the inner cavity of the annular pressing column (8). The flow-limiting sheet (9) has micro air holes (91) communicating the outside and the stroke cavity (3). The outer diameter of the flow-limiting sheet (9) is smaller than the inner diameter of the inner cavity of the annular pressing column (8). An elastic member III (102) is connected to the bottom of the flow-limiting sheet (9) and can press the flow-limiting sheet (9) on the periphery of the through hole (121).

26. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that The inner side wall of the through hole (121) is in a horn shape and the large end is at the end close to the bottom of the seat body (1). An annular pressing column (8) abutted against the limiting sheet (12) is screwed and fitted in the sink (11). A plug (105) capable of blocking the through hole (121) is provided in the inner cavity of the annular pressing column (8) which abuts against the limiting sheet (12). The shape of the plug (105) is adapted to the shape of the through hole (121). The plug (105) has micro air holes (91) communicating the outside and the stroke cavity (3). An elastic member III (102) is connected to the bottom of the plug (105) and can press the plug (105) in the through hole (121).

27. The energy-absorbing bulletproof detachable door bumper according to claim 19, characterized in that The inner cavity of the annular pressing column (8) has a dust filtering member (103), and the dust filtering member (103) is a filter screen or a sintered particle filter sheet or a pressed filter sheet or a filter cloth.

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