Novel fire door based on small-diameter mechanical method connecting passage

Abstract

The present application relates to the technical field of communication passage, and particularly relates to a fireproof door for a small-diameter mechanical communication passage, which comprises a communication passage, a center column located in the communication passage, door bodies located on both sides of the center column, a missing corner structure provided at a movable side top corner of the door body, a door closing device provided in an opening and closing direction of the door body, a connecting main body, a first hydraulic passage and a second hydraulic passage provided on the connecting main body, a reciprocating member provided in an inner cavity of the connecting main body, a detection assembly provided on a door frame of the door body and covering a passing area before and after the door frame downwardly, the detection assembly detecting whether a person is in a range of the door frame, a first adjusting member provided on the first hydraulic passage, and a second adjusting member provided on the second hydraulic passage. The present application can realize anti-piston wind and easy opening through hydraulic adjustment, the escape door can be prevented from being clamped and blocked during hovering, the hydraulic lock of the door can be prevented from backflowing, the door can be degraded into a mechanical door in the case of power failure, and the evacuation safety under extreme working conditions is ensured.

Description

Technical Field

[0001] This invention relates to the field of communication channel technology, and in particular to a novel fire door based on a small-diameter mechanical communication channel. Background Technology

[0002] As an emergency evacuation passage connecting the upstream and downstream shield tunnel sections, the connecting passage of urban rail transit sections also serves as a collection and discharge function for structural leakage water and fire wastewater. It usually needs to be equipped with two Class A fire doors that open in opposite directions, as well as a wastewater pump room and a through drainage system.

[0003] In recent years, in order to avoid the risks of frost heave and thawing settlement and excavation collapse that exist in the construction of connecting passages using the traditional freezing method and mining method, the small-diameter mechanical method has gradually become the mainstream construction technology for connecting passages in water-rich soft soil strata.

[0004] Currently, mechanical connection tunnels have been implemented in some cities in China. However, due to the limitation of the opening size of the main tunnel in the section, the clearance size inside the connection tunnel cannot meet the requirement of installing two fire doors side by side with a clearance width of not less than 900mm. Installing fire doors in the narrow space inside the mechanical connection tunnel has become a challenge for this type of project.

[0005] CN114575923B discloses a method for installing fire doors in confined spaces within mechanical connection passages. The method involves installing steel pipe segment rings at the fire door installation locations within the passage, ensuring that the four corners of the fire door opening are within the cavities of the steel pipe segments. After the steel pipe segment rings are installed at the fire door, fire door jambs are installed around the fire door opening. A reinforcing steel frame for the fire door jambs is then tied, with the contact points between the steel pipe segment rings and the frame fixed by welding. Embedded steel plates are installed around the fire door opening and reliably welded to the reinforcing steel frame. After the reinforcing steel frame is tied and the embedded steel plates are welded, the fire door jambs are poured, and the cavities of the steel pipe segments are filled and compacted with concrete before installing the fire door. By utilizing the space within the steel pipe segment cavities to meet the installation space requirements of the fire door, this method fulfills the requirement of installing fire doors that meet specifications within confined spaces within mechanical connection passages, and allows for straight-line evacuation, demonstrating strong practicality and versatility.

[0006] Although the aforementioned documents utilize the space of the steel tube segment partition to meet the installation space requirements of fire doors, in actual application, in the subway tunnel environment, the piston effect generated by the high-speed operation of the train will form periodic positive and negative pressure waves in the tunnel. When a fire occurs, if the piston wind happens to blow from the back of the fire door in the connecting passage, the wind pressure will directly act on the unexposed side of the door leaf, making it impossible for the door closer to overcome the external thrust to complete the automatic closing, resulting in the fire door being in a normally open state, and smoke spreading along the door opening to the safe area. To deal with this situation, on-site maintenance personnel often increase the preload of the door closer spring to forcibly resist the wind pressure, but this significantly increases the opening and closing resistance of the door leaf. In a fire evacuation scenario, it is difficult for weak people to push open the heavy door leaf, which can easily cause congestion of evacuation passages or even stampedes.

[0007] On the other hand, during peak fire evacuation periods, when a large number of passengers pass through the connecting passages one after another, the rebound speed control of the door closers faces a dilemma: if the rebound speed is too fast, the door will quickly reset after people have passed, and will hit the back of the evacuees behind like a pendulum or pinch their limbs; if the closing speed is slowed down by increasing the hydraulic damping, the closing time of the door will be extended to several seconds or even more than ten seconds. During this period, toxic smoke in the tunnel will continue to pour into the connecting passages, which should be safe areas, through the door gaps, seriously weakening the reliability of fire separation.

[0008] The aforementioned contradiction stems from the fact that existing fire door closing mechanisms can only provide a single, fixed closing torque and damping curve, and cannot be dynamically adjusted according to real-time wind pressure environment and evacuation flow density, thus creating an irreconcilable conflict between "wind pressure resistant tight closing" and "low-resistance evacuation".

[0009] Therefore, it is particularly crucial and urgent to develop a new type of fire door based on a small-diameter mechanical connection channel that can effectively overcome the above-mentioned technical difficulties. Summary of the Invention

[0010] The purpose of this invention is to provide a novel fire door based on a small-diameter mechanical connection channel to solve the technical problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a fire door for a small-diameter mechanical connection passage, including a connection passage and a central column located inside the connection passage, with door bodies on both sides of the central column, the door bodies being symmetrical about the center of the central column; A notched corner structure is provided at the top corner of the movable side of the door body; A door closing device, which is respectively arranged in the opening and closing direction of the door, includes a movable connecting rod and a connecting body. The connecting body is provided with a first hydraulic channel and a second hydraulic channel. A reciprocating component is provided in the inner cavity of the connecting body. When the reciprocating component moves back and forth inside the connecting body, the hydraulic oil inside the connecting body circulates between the first hydraulic channel and the second hydraulic channel. The detection components are distributed on the door frame of the door, covering the passage area in front of and behind the door frame, to detect whether there is a person within the door frame area; A cross-section adjustment assembly includes a first adjustment member disposed on a first hydraulic channel and a second adjustment member disposed on a second hydraulic channel; The cross-sectional adjustment component actively adjusts the flow cross-sectional area of ​​the first hydraulic channel and the second hydraulic channel according to the detection results of the detection component, thereby switching the door between the hovering and locking states.

[0012] Preferably, the door body includes a door frame and a door leaf; The door leaf is equipped with a push rod door lock and a handle door lock on both sides. The push rod door lock is equipped with a touch sensor to detect whether someone is pushing the door forcefully; the handle door lock is equipped with a rotation sensor to detect whether someone is turning the handle door lock. Differential pressure sensors are installed on both sides of the door leaf to detect the magnitude and direction of the static air pressure difference between the two sides of the door leaf in real time.

[0013] Preferably, in the normal windproof mode, when the value detected by the differential pressure sensor exceeds the set threshold and personnel need to open the door, the first adjusting member is in the expansion mode to expand the flow cross section of the first hydraulic channel.

[0014] Preferably, in escape mode, the door is divided into an escape door and a blocking door according to the direction of smoke diffusion. If the detection component detects that people are continuously passing through the door frame of the escape door, or the interval between people passing through is extremely short, the second adjusting component is controlled to be in cut-off mode to cut off the flow section of the second hydraulic channel. When the detection component detects that no one is in the door frame area for a period of time exceeding a set value, the second adjustment component enters the expansion mode to increase the flow cross-section of the second hydraulic channel.

[0015] Preferably, in escape mode, the first adjusting member corresponding to the control barrier door is in cut-off mode to cut off the flow section of the first hydraulic channel.

[0016] Preferably, the reciprocating component includes an elastic element disposed inside the connecting body, the end of the elastic element is provided with a piston body, the middle part of the piston body is provided with a connecting cavity, the connecting cavity is provided with a connecting gear, and one end of the connecting gear extending out of the connecting body is connected to the movable connecting rod.

[0017] Preferably, a first one-way valve is provided at the connection between the piston body and the elastic element, and a second one-way valve is provided at the end of the piston body away from the elastic element.

[0018] Preferably, the communication channel is provided with a door or wall, and the door or wall has reserved installation space; The central column is located in the middle of the installation space, and door bodies are provided on both sides of the central column. The door frames of the door bodies are connected to the door wall.

[0019] Preferably, the door frame is provided with an array of pre-embedded anchors, and the door frame is fixedly connected to the door wall through the pre-embedded anchors.

[0020] Preferably, the first regulating member and the second regulating member include normally open solenoid valves that are de-energized.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention achieves adjustable control of the hydraulic channel cross-section through the first and second adjusting components. During the opening stage, the thrust is reduced by expanding the first hydraulic channel, thus resolving the contradiction that the conventional increase of the door closer's pre-tightening force under the train's piston wind makes it difficult for the elderly and children to push the door open. During the closing stage, the speed is controllable by adjusting the cross-section of the second hydraulic channel, and the countermeasure mode is switched before the piston wind arrives, replacing the mechanical increase of pre-tightening with hydraulic locking, thus preventing the door from being blown open or slapped by positive and negative wind pressure.

[0022] 2. This invention combines a detection component with differential pressure, touch, and rotation sensors on both sides of the door leaf. The system can adaptively switch between non-fire normal conditions, piston-wind operation, and fire evacuation operation: During peak evacuation periods, when the detection component identifies continuous passage of personnel within the door frame, it hydraulically locks and suspends the escape-side door to prevent people from being trapped, while rigidly locking the back-fire-side blocking door to prevent accidental opening by personnel in the smoke-filled environment, which could lead to chaotic backflow and the intrusion of hot air. After evacuation is completed and no personnel remain, the second adjustment component switches back to the expansion mode, and the door leaf quickly returns to its original position to isolate smoke.

[0023] This invention relies on the coordinated control of the first and second hydraulic channels by a cross-section adjustment component to comprehensively overcome multiple technical conflicts in subway connecting passages under different operating conditions without adding complex external mechanical door closing structures. Firstly, by actively switching the hydraulic flow path state through the first adjustment component, it can resist alternating piston wind pressure through hydraulic locking under normal operating conditions, and instantly expand the flow cross-section to relieve hydraulic resistance when personnel touch the door to open it, solving the inherent defect of traditional door closers that rely on increased spring preload to resist wind, making it difficult for the elderly and weak to push the door open. Secondly, by cutting off and expanding the return oil circuit through the second adjustment component, it achieves powerless anti-pinch hovering of the door during peak evacuation periods and rapid reset after evacuation confirmation, resolving the conflict between traditional fixed damping door closers that easily collide with people behind during continuous passage and those that close too slowly, leading to smoke intrusion. This solution, through a shared hydraulic adjustment architecture, simultaneously meets the combined requirements of wind pressure resistance, low-resistance opening, safe hovering, and rapid smoke isolation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the communication channel of the present invention; Figure 2 This is a schematic diagram of the overall structure of the fire door of the present invention; Figure 3 This is a schematic diagram of the connection structure between the fire door and the wall according to the present invention; Figure 4 This is a top view of the fire door structure of the present invention; Figure 5 This is a schematic diagram of the opening structure of the fire door of the present invention; Figure 6 This is a schematic diagram of the connection structure between the fire door and the door closing device of the present invention; Figure 7 This is a schematic diagram of the internal structure of the connecting body of the present invention; Figure 8 This is a schematic diagram of the piston body of the present invention.

[0025] In the picture: 1. Communication channels; 2. Subway passageway; 3. Doors and walls; 4. Door body; 401. Door frame; 402. Door leaf; 5. Push-rod door lock; 6. Lock the door handle; 7. Door closing device; 701. Movable connecting rod; 702. Connecting body; 703. Reciprocating component; 7031. Connecting gear; 7032. Piston body; 7033. Elastic component; 704. First hydraulic channel; 705. Second hydraulic channel; 8. Cross-section adjustment assembly; 801. First adjustment component; 802. Second adjustment component; 9. Central column; 10. Embedded anchors. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1 Existing small-diameter mechanical connection passages 1 mostly use fire doors arranged at an angle. Because the door 4 cannot be directly facing the passage entrance, there are problems such as limited evacuation width, obstructed vision, and misjudgment of direction during emergency evacuation, which increases the difficulty of passage and slows down the evacuation speed, making it difficult to fully guarantee personal safety. Based on this, this embodiment proposes a fire door for small-diameter mechanical connection passages.

[0028] Reference Figures 1 to 5 As shown, this embodiment proposes a fire door for a small-diameter mechanical connecting passage, including a connecting passage 1, which is located between two parallel subway passages 2, and is used to realize the connection between the two subway passages 2.

[0029] A doorway 3 is constructed inside the connecting passage 1. A gap area for assembly is reserved on the wall. A central column 9 stands in the middle of this area, dividing the reserved space into two. A door 4 is arranged on each side of the central column 9. The two door 4 are centrally symmetrical about the central column 9, and the two door 4 are arranged horizontally inside the connecting passage 1.

[0030] Each door body 4 consists of a door frame 401 and a door leaf 402. The door frame 401 is fixedly connected to the door wall 3, and one side of the door leaf 402 is hinged to the door frame 401 or the central post 9 via a hinge. Since the two door bodies 4 are arranged symmetrically, the opening and closing directions of the two door leaves 402 are opposite. That is, when one door leaf 402 is pushed outward, the other side moves inward or in the opposite direction. See the specific details. Figure 4 and Figure 5 As shown.

[0031] It should be noted that a rigid connection is achieved between the door frame 401 and the door wall 3 using pre-embedded anchors 10. The pre-embedded anchors 10 are arranged in an array along the circumference of the door frame 401 to ensure that the load is evenly transferred to the wall. The pre-embedded anchor 10 consists of an embedded anchor plate and several embedded anchor bars. One end face of the embedded anchor plate is attached to and fixed to the door frame 401, while the other end face is welded or integrally formed with multiple embedded anchor bars. The end of the embedded anchor bar away from the embedded anchor plate extends into the interior of the door wall 3 and is anchored to the concrete of the wall, thereby transferring the shear force and bending moment on the door frame 401 to the door wall 3 as a whole through the pre-embedded anchors 10.

[0032] The top corner of the door 4 on the movable side is cut off to form a missing corner structure, which makes the corner trajectory of the door leaf 402 expand outward during opening and maximizes the opening and closing angle. This avoids the problem of the effective width of the evacuation passage being compressed due to the interference between the top corner of the door leaf 402 and the door frame 401 or the wall in traditional diagonally arranged fire doors. In emergency situations, it can improve the efficiency of personnel passage, reduce the risk of congestion, and provide better protection for people's safety.

[0033] Each of the two door panels 402 is equipped with a push-rod lock and a handle lock, and the push-rod locks 5 and handle locks 6 on the two door panels 402 are arranged symmetrically with the vertical central axis of the central column 9 as the center. This combination of differentiated locks on both sides and symmetrical arrangement ensures that the door panel 402 can be triggered to return to its original position and lock when pushed from either direction. This ensures that the fire door closes in time after evacuation, blocking the fire source and smoke on the side of the fire, preventing high temperature and toxic smoke from spreading to the evacuation route and injuring people, thus protecting the safety of personnel.

[0034] Example 2 Although Implementation Example 1 improves the efficiency of personnel passage in emergency situations, in actual application, the periodic wind pressure generated by the train piston effect can easily prevent the fire door from closing automatically. While increasing the preload of the door closer spring can counteract the wind pressure, it significantly increases the opening and closing resistance of the door leaf 402, making it difficult for the elderly, children, and other frail people to push it open, which can easily lead to congestion of evacuation routes or even stampedes.

[0035] Reference Figures 1 to 8 As shown, this embodiment proposes a fire door for a small-diameter mechanical connection passage, including a closing device 7 disposed in the opening and closing direction of the door body 4. The closing device 7 includes a movable connecting rod 701 and a connecting body 702. One end of the movable connecting rod 701 is connected to the door frame 401, and the other end is connected to the reciprocating component 703 inside the connecting body 702.

[0036] The reciprocating component 703 includes an elastic element 7033 disposed inside the connecting body 702. The end of the elastic element 7033 is provided with a piston body 7032. A connecting cavity is provided in the middle of the piston body 7032. A connecting gear 7031 is provided in the connecting cavity. The connecting gear 7031 meshes with the teeth provided in the connecting cavity. One end of the connecting gear 7031 extending out of the connecting body 702 is connected to the movable connecting rod 701.

[0037] In the design of the fluid circuit, the connecting body 702 is provided with a first hydraulic channel 704 and a second hydraulic channel 705. A first check valve is provided at the connection between the piston body 7032 and the elastic element 7033, and a second check valve is provided at the end of the piston body 7032 away from the elastic element 7033.

[0038] When a person pushes open the door 402, the connecting gear 7031 rotates with the door hinge and moves the piston body 7032, compressing the elastic element 7033 to store energy; at this time, the reciprocating element 703 moves back and forth inside the connecting body 702, and the hydraulic oil inside the connecting body 702 circulates between the first hydraulic channel 704 and the second hydraulic channel 705.

[0039] Reference Figures 4 to 6 As shown, a push rod door lock 5 and a handle door lock 6 are respectively provided on both sides of the door leaf 402; the push rod door lock 5 is equipped with a touch sensor to detect whether someone is pushing the door with force; the handle door lock 6 is equipped with a rotation sensor to detect whether someone is rotating the handle door lock 6; in addition, differential pressure sensors are respectively provided on both sides of the door leaf 402 to detect the magnitude and direction of the static air pressure difference on both sides of the door leaf 402 in real time.

[0040] Combination Figure 7 and Figure 8 As shown, in this embodiment, a cross-section adjustment component 8 is added to the hydraulic circuit, which includes a first adjustment component 801 disposed on the first hydraulic channel 704 and a second adjustment component 802 disposed on the second hydraulic channel 705.

[0041] When the fire door is in normal use, the staff can set the control parameters of the first adjusting component 801 and the second adjusting component 802 to adjust the flow area of ​​the first hydraulic channel 704 and the second hydraulic channel 705.

[0042] Specifically, when the worker opens the fire door, the door leaf 402 is pushed to rotate around the hinge. During the rotation, the door leaf 402 simultaneously pulls the movable connecting rod 701. When the movable connecting rod 701 moves, it simultaneously drives the connecting gear 7031 to rotate. The connecting gear 7031 pushes the piston body 7032 towards the elastic element 7033 through the teeth in the connecting cavity. When the piston body 7032 moves towards the area of ​​the elastic element 7033, the first one-way valve on the piston body 7032 is in the closed state. When the piston body 7032 moves, it simultaneously squeezes the hydraulic oil in the area where the elastic element 7033 is located into the first hydraulic channel 704. The hydraulic oil enters the connecting cavity on the piston body 7032 through the first hydraulic channel 704. As the piston body 7032 continues to move, the amount of hydraulic oil entering the connecting cavity gradually increases, and through the second one-way valve at the end of the piston body 7032 away from the elastic element 7033, it enters the area where the piston body 7032 was originally located. As the opening angle increases, the hydraulic oil fills the entire piston area.

[0043] When the door is no longer pushed, the piston body 7032 is pushed by the pressure of the elastic element 7033 and moves towards the piston area, that is, the door leaf 402 rotates in the closing direction. When the piston body 7032 moves towards the piston area, the second one-way valve on the piston body 7032 is in the closed state. When the piston body 7032 moves, the hydraulic oil in the piston area acts as damping and gradually enters the connecting cavity on the piston body 7032 through the second hydraulic channel 705, and pushes the first one-way valve into the area of ​​the elastic element 7033.

[0044] When the door is opened, the piston body 7032 compresses the elastic element 7033, and hydraulic oil enters the piston area through the first hydraulic channel 704; when the door is closed, the piston body 7032 resets, and hydraulic oil returns to the area of ​​the elastic element 7033 through the second hydraulic channel 705.

[0045] In actual use, staff can set the control parameters of the first adjusting component 801 and the second adjusting component 802 to adjust the flow area of ​​the first hydraulic channel 704 and the second hydraulic channel 705, thereby adjusting the resistance to opening the door and the speed of closing the door.

[0046] The cross-section adjustment component 8 is used to adjust the flow resistance of the internal high-pressure hydraulic oil; the first hydraulic channel 704 is used to guide the high-pressure hydraulic fluid for opening the door on the piston pressure side; the second hydraulic channel 705 is used to guide the return hydraulic fluid for closing the door on the elastic reset side. Under normal conditions of frequent piston wind, when the differential pressure sensor detects that the static pressure difference exceeds the set threshold, the cross-section adjustment component 8 actively reduces the flow cross-section of the first hydraulic channel 704 to achieve throttling and wind resistance; under peak evacuation conditions, if the detection component at the top of the door frame is continuously triggered, the flow path of the first hydraulic channel 704 is cut off, so that the reciprocating component 703 is in a rigid hydraulic locking state, thereby achieving the suspension and anti-pinch function of the door leaf; under conditions of power failure of the entire system, such as fire, the second hydraulic channel 705 remains open due to the de-energization of the electromagnet, and the door closing device 7 degenerates into relying solely on the release of mechanical potential energy to achieve reset and closure. The above dynamic control configuration not only solves the technical problem of the elderly and children having difficulty pushing the door due to the excessive increase of the door closer's pre-tightening force in order to resist wind pressure in traditional technology, but also solves the problem of people being easily injured by the rebound of the door during continuous evacuation.

[0047] Specifically, when the first adjusting member 801 is in the expansion mode, the flow cross section of the first hydraulic channel 704 is expanded. When the operator opens the door, the hydraulic oil in the area of ​​the elastic member 7033 can smoothly and unobstructedly enter the piston area, and the resistance to opening the door is minimal at this time.

[0048] When the first adjusting member 801 is in the shrinking mode, the flow cross section of the first hydraulic channel 704 is reduced. When the operator opens the door, the hydraulic oil in the area of ​​the elastic member 7033 will be subject to a certain resistance before entering the piston area, that is, the resistance to opening the door is increased.

[0049] When the first adjusting member 801 is in the cut-off mode, the flow section of the first hydraulic channel 704 is cut off. When the staff opens the door, because the first hydraulic channel 704 is not in the conducting state, the hydraulic oil in the area of ​​the elastic member 7033 is in a static state and cannot flow, that is, the door leaf 402 is in a locked state.

[0050] When the second adjusting member 802 is in the expansion mode, the flow cross section of the second hydraulic channel 705 is expanded. When the door closes automatically, the hydraulic oil is not blocked, and the hydraulic oil in the piston area can smoothly return to the elastic member 7033 area. At this time, the closing speed is the fastest.

[0051] When the second adjusting member 802 is in the shrinking mode, the flow section of the second hydraulic channel 705 is reduced. When the door closes automatically, the damping effect of the hydraulic oil in the piston area on the piston body 7032 is enhanced, thereby slowing down the closing speed.

[0052] When the second adjusting member 802 is in the cut-off mode, the flow section of the second hydraulic channel 705 is cut off, the piston body 7032 cannot return to the piston area under the elastic recovery capability of the elastic member 7033, and the hydraulic oil cannot return to the area of ​​the elastic member 7033. At this time, the door leaf 402 is in the hovering and locking state.

[0053] When the fire door is in a non-fire, off-peak operation state, the controller puts both the first adjusting component 801 and the second adjusting component 802 in the shrinking mode. At this time, the door opening resistance is moderate and the door closing speed is smooth. This can prevent the door leaf 402 from being violently swung after being accidentally touched by the elderly or children, and also prevent the door leaf 402 from opening on its own under the low-frequency micro-vibration of piston wind. In this mode, if the differential pressure sensor detects that the static pressure difference on both sides of the door leaf 402 continues to exceed the preset threshold for a preset time, it is determined to be a precursor to piston wind generated by the train about to pass, and the controller automatically switches to piston wind countermeasure mode.

[0054] In piston-wind countermeasure mode, when the touch sensor on the push rod door lock 5 or the rotation sensor on the handle door lock 6 detects an opening signal, the first adjusting member 801 on the corresponding door leaf 402 is controlled to switch to the expansion mode to increase the flow cross section of the first hydraulic channel 704, thereby reducing the opening resistance and preventing the wind pressure combined with the push force of the hand from causing an abnormally heavy opening and closing feel; at the same time, the second adjusting member 802 is controlled to switch to the cut-off mode, so that the hydraulic oil in the piston area cannot flow back, and the door leaf 402 is "hydraulically locked" at the current angle under the pre-tightening of the elastic member 7033, preventing the door leaf 402 from being blown open or repeatedly hitting the door frame 401 due to the alternating positive and negative piston wind; after the train passes and the pressure difference drops below the threshold, the second adjusting member 802 returns to the shrinking mode, and the door leaf 402 slowly returns to its closed position.

[0055] Compared to the conventional approach of "simply increasing the preload of the door closer spring", the hydraulic locking method replaces the mechanical preload increase, allowing the first adjustment component 801 to switch back to the expansion mode to unload when the door is pushed by hand, without increasing the force required to open the door for the elderly and children, thus resolving the traditional contradiction between "wind resistance" and "easy opening".

[0056] It should be noted that in this embodiment, the first regulating member 801 and the second regulating member 802 include normally open solenoid valves that are de-energized.

[0057] In actual use, a large fire can easily burn out the wiring, causing a power outage for the entire system. If the mains power and backup power are exhausted, and the entire system loses power, the first regulating component 801 and the second regulating component 802, which are normally open solenoid valves in the event of a power failure, will automatically spring back to the maximum open state due to the power failure. At this time, the control system degenerates into a standard fire door controlled by a purely mechanical door closer. Escapees can still push it open manually, and the door 4 will automatically close using a purely mechanical spring, ensuring the most extreme fire safety.

[0058] Example 3 Although Embodiment 2 solved the problem of the train piston effect, which made it difficult for the elderly, children, and other frail people to push open door 402, there are still corresponding technical problems in actual application. That is, during the peak evacuation period due to fire or other reasons, the control of the door closer's rebound speed is caught in a dilemma. If the rebound is too fast, it will hit or pinch those evacuating behind; if the rebound is too slow, it will prolong the closing time, causing toxic smoke to continuously pour into the connecting passage 1, which seriously weakens the reliability of the fire separation. At the same time, since the fire doors in the connecting passage 1 are double-leaf fire doors set in opposite directions, in the event of a disaster, one fire door is usually used as the transfer passage. However, in actual transfer, especially in the case of smoke-filled scenes, due to confusion and obstructed vision, the other fire door is often opened, causing a "chaotic backflow" phenomenon, which causes some people who have entered the safe area to return to the danger zone. In view of this, technical improvements are made based on Embodiment 2. The improved technical solution is as follows.

[0059] This embodiment proposes a fire door for a small-diameter mechanical passageway, including a detection component. The detection component is distributed on the door frame 401 of the door body 4, covering the passage area in front of and behind the door frame 401, and detecting whether a person is within the range of the door frame 401. The detection component can be a microwave or infrared area sensor.

[0060] It also includes a cross-section adjustment assembly 8, which includes a first adjustment member 801 disposed on the first hydraulic channel 704 and a second adjustment member 802 disposed on the second hydraulic channel 705; The cross-sectional adjustment component 8 actively adjusts the flow cross-sectional area of ​​the first hydraulic channel 704 and the second hydraulic channel 705 according to the detection results of the detection component, so as to switch the door body 4 between the hovering and locking states.

[0061] When in use, if the system receives a report of a fire or other disaster in subway passage 2, the system control section adjustment component 8 will enter the escape mode.

[0062] It is important to note that the system detects whether a disaster has occurred using smoke detectors or other sensor arrays.

[0063] Reference Figure 5 As shown, assuming a fire occurs in subway passage 2 located to the left of connecting passage 1, the system will set door A as a blocking door and door B as an escape door according to the direction of smoke diffusion.

[0064] In escape mode, if the detection component on the door frame 401 detects that someone has passed through the door frame 401 of the escape door, or the interval between people passing through is extremely short, the second adjusting component 802 is controlled to enter the cut-off mode to cut off the flow section of the second hydraulic channel 705. After the second hydraulic channel 705 is cut off, the internal hydraulic oil is rigidly locked. At this time, the door 4 is in a state close to "hovering", thus reserving an absolutely safe continuous passage for continuously pouring people and completely eliminating the risk of people being trapped.

[0065] It is important to note that when the second adjusting component 802 on the escape door is in the cut-off mode, the control system simultaneously controls the first adjusting component 801 corresponding to the blocking door to be in the cut-off mode, thereby cutting off the flow section of the first hydraulic channel 704. By cutting off the hydraulic flow path of the other door, the blocking door is made into a rigid hydraulic lock state, preventing the blocking door from being opened by mistake due to confusion and obstructed vision in a smoke-filled scene, thus avoiding the phenomenon of "random backflow" and causing some people who have entered the safe area to return to the danger zone. At the same time, it can prevent the high-pressure fire hot air and piston wind from accidentally blowing open the fire door on the leeward side, ensuring the absolute isolation of the interior of the connecting passage 1 as a safe refuge space.

[0066] When the detection component continuously detects that no one is in the door frame 401 area for a period of time exceeding the set value, the system determines that the evacuation is complete. At this time, the control of the second adjustment component 802 is in the expansion mode to expand the flow cross section of the second hydraulic channel 705. The door 4, which has lost hydraulic blocking, immediately and quickly rotates and closes under the push of the internal elastic component 7033 to isolate the smoke.

[0067] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fire door for a small-diameter mechanical connecting passage, comprising a connecting passage (1), characterized in that, Also includes: The central column (9) is located inside the connecting passage (1), and there are doors (4) on both sides of it. The doors (4) are symmetrical about the center of the central column (9). A missing corner structure is provided at the top corner of the movable side of the door body (4); A door closing device (7) is provided in the opening and closing direction of the door body (4), including a movable connecting rod (701) and a connecting body (702). The connecting body (702) is provided with a first hydraulic channel (704) and a second hydraulic channel (705). A reciprocating component (703) is provided in the inner cavity of the connecting body (702). When the reciprocating component (703) moves back and forth inside the connecting body (702), the hydraulic oil inside the connecting body (702) circulates between the first hydraulic channel (704) and the second hydraulic channel (705). The detection components are distributed on the door frame (401) of the door body (4), covering the passage area in front of and behind the door frame (401) to detect whether anyone is within the range of the door frame (401); The cross-section adjustment assembly (8) includes a first adjustment member (801) disposed on a first hydraulic channel (704) and a second adjustment member (802) disposed on a second hydraulic channel (705). The cross-sectional adjustment component (8) actively adjusts the flow cross-sectional area of ​​the first hydraulic channel (704) and the second hydraulic channel (705) according to the detection results of the detection component, so as to realize the switching between the hovering and locking states of the door (4).

2. The fire door for a small-diameter mechanical connecting passage according to claim 1, characterized in that, The door body (4) includes a door frame (401) and a door leaf (402); The door leaf (402) is provided with a push rod door lock (5) and a handle door lock (6) on both sides respectively. The push rod door lock (5) is provided with a touch sensor to detect whether someone is pushing the door forcefully; the handle door lock (6) is provided with a rotation sensor to detect whether someone is rotating the handle door lock (6). Differential pressure sensors are provided on both sides of the door leaf (402) to detect the magnitude and direction of the static air pressure difference on both sides of the door leaf (402) in real time.

3. The fire door for a small-diameter mechanical connection passage according to claim 2, characterized in that, In normal windproof mode, when the value detected by the differential pressure sensor exceeds the set threshold and personnel need to open the door, the first adjusting member (801) is in expansion mode to expand the flow cross section of the first hydraulic channel (704).

4. The fire door for a small-diameter mechanical connection passage according to claim 2, characterized in that, In escape mode, the door (4) is divided into an escape door and a blocking door according to the direction of smoke diffusion. If the detection component detects that people are continuously passing through the door frame (401) of the escape door, or the interval between people passing through is extremely short, the second adjustment component (802) is controlled to be in the cut-off mode to cut off the flow section of the second hydraulic channel (705). When the detection component detects that no one is in the door frame (401) area for more than a set value, the second adjustment member (802) is in expansion mode to expand the flow cross section of the second hydraulic channel (705).

5. The fire door for a small-diameter mechanical connecting passage according to claim 4, characterized in that, In escape mode, the first adjusting member (801) corresponding to the control blocking door is in cut-off mode to cut off the flow section of the first hydraulic channel (704).

6. The fire door for a small-diameter mechanical connecting passage according to claim 1, characterized in that, The reciprocating component (703) includes an elastic component (7033) disposed inside the connecting body (702). The end of the elastic component (7033) is provided with a piston body (7032). The middle part of the piston body (7032) is provided with a connecting cavity. A connecting gear (7031) is provided inside the connecting cavity. One end of the connecting gear (7031) extending out of the connecting body (702) is connected to the movable connecting rod (701).

7. The fire door for a small-diameter mechanical connecting passage according to claim 6, characterized in that, A first one-way valve is provided at the connection between the piston body (7032) and the elastic element (7033), and a second one-way valve is provided at the end of the piston body (7032) away from the elastic element (7033).

8. The fire door for a small-diameter mechanical connecting passage according to claim 1, characterized in that, The communication channel (1) is equipped with a door wall (3), and the door wall (3) has reserved installation space; The central column (9) is located in the middle of the installation space. Doors (4) are provided on both sides of the central column (9). The door frame (401) of the door (4) is connected to the door wall (3).

9. The fire door for a small-diameter mechanical connecting passage according to claim 8, characterized in that, The door frame (401) is provided with an array of pre-embedded anchors (10), and the door frame (401) is fixedly connected to the door wall (3) through the pre-embedded anchors (10).

10. The fire door for a small-diameter mechanical connecting passage according to claim 1, characterized in that, The first regulating member (801) and the second regulating member (802) include normally open solenoid valves that are de-energized.

Images