Sealing access door and air purifying device

Abstract

The utility model discloses a sealing access door and an air purifying device. The sealing access door comprises a door frame, a door plate hinged to one side of the door frame and a sealing piece arranged between the door frame and the door plate and used for sealing. An inner frame of the door frame and an outer frame of the door plate are correspondingly arranged to be of a step-shaped structure which can be clamped with each other, the sealing piece comprises a first sealing strip and a second sealing strip which are sequentially arranged in the direction from the outer side to the inner side of the door plate, and the first sealing strip and the second sealing strip are both installed at the corners of the step-shaped structure. The sealing ring is used for abutting against a door frame and / or a frame of a door plate to form two seals. The sealing access door is a vertical hinged door which is opened and closed through cooperation of hinges, is large in size, is convenient for personnel and equipment to enter and exit for equipment replacement or maintenance, and is safe and convenient. The ladder-shaped structure of the sealing access door can form multi-layer corner sealing, external rainwater is effectively prevented from permeating into the inner side of the door plate, the first sealing strip and the second sealing strip can form two seals between the inner side and the outer side of the door plate, and the sealing effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of overhauling equipment, in particular to a sealed access door. In addition, the utility model also relates to a clean air device comprising the sealed access door. BACKGROUND

[0002] The function and role of the gas turbine intake system are to filter out dust and particles in the air, let clean air into the gas turbine, and ensure the safe and reliable operation of the gas turbine. The gas turbine intake system is generally arranged outdoors in a harsh environment. The intake system contains multiple filters and heating and separation devices, and the air flow in the intake system is large, the flow rate is fast, and it is in a negative pressure environment. When the intake filter element adsorbs too much dust and the resistance rises to a critical value, the operator needs to frequently enter and exit for maintenance, replace the filter element, and perform routine inspection.

[0003] At present, a flange cover plate type access door is usually arranged on the access manhole to seal the intake system and facilitate personnel to enter and exit for replacing the filter element, overhauling the equipment, and other work. For example, a Chinese patent with publication number CN216994817U discloses a sea valve box, a ship cooling system, and a ship. The sea valve box comprises a sea valve box body, a filter element, and a cover plate group. The filter element is detachably connected in the sea valve box body. The cover plate group comprises a working cover plate and a flushing cover plate. In the working condition, the working cover plate is detachably connected to the outside of the access opening and seals the filter element in the sea valve box body. The working cover plate of the patent has good sealing effect. However, the size of the access opening is small, which is not conducive to the entry and exit of the operator, making it difficult to transport and replace the filter element and overhaul the equipment. Moreover, the working cover plate needs to be disassembled every time the operator enters the access opening. The working cover plate has many fasteners, and the operation is relatively cumbersome, which is not suitable for the case where the filter element needs to be frequently replaced. In the prior art, a flat open type access door is also used. The flat open type access door is opened and closed by the cooperation of a door lock and a hinge, which facilitates the operator to enter and exit to transport and replace the filter element. However, the existing flat open type access door usually has a large door panel size and is single-sided sealed. In the negative pressure environment in the gas turbine intake system, the access door is prone to deformation, which may cause leakage in the intake system. Moreover, external air or rainwater may enter the intake system through the wallboard, causing the intake system to fail and poor sealing. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a sealed access door to solve the technical problem of the access door of the gas turbine intake system in the prior art, which is inconvenient to enter and exit and has poor sealing.

[0005] According to one aspect of the utility model, a sealed access door is provided, which comprises a door frame, a door panel hinged to one side of the door frame, and a sealing element arranged between the door frame and the door panel and used for sealing.

[0006] The inner frame of the door frame and the outer frame of the door panel are correspondingly provided as a stepped structure capable of being engaged with each other, and the sealing member comprises a first sealing strip and a second sealing strip arranged in sequence along the direction from the outer side to the inner side of the door panel, both the first sealing strip and the second sealing strip are installed at the corner of the stepped structure and used for abutting against the frame of the door frame and / or the door panel to form two seals.

[0007] Further, the outer surfaces of the door frame and the door panel are both covered with a steel plate, the first sealing strip is fixed on the steel plate at the inner corner of the door frame and used for forming a first sealing surface with the door panel along the opening and closing direction of the door panel;

[0008] The second sealing strip is fixed on the steel plate at the inner corner of the door panel and used for forming a second sealing surface with the door frame perpendicular to the opening and closing direction of the door panel.

[0009] Further, the cross section of the first sealing strip is in D shape, and the flat end of the first sealing strip is parallel to the door panel and fixedly attached to the steel plate.

[0010] Further, the outer frame of the door panel is provided with a groove facing the door frame, and the second sealing strip is clamped in the groove and protrudes towards the door frame;

[0011] The steel plate on the door panel is sealingly inserted into the second sealing strip.

[0012] Further, the second sealing strip comprises a ring-shaped closed section and a U-shaped open section, the ring-shaped closed section is arranged close to the inner side of the door panel and used for abutting against the door frame, and the opening of the U-shaped open section is arranged facing the door frame to allow the end of the steel plate on the door panel to be sealingly inserted.

[0013] Further, the inner side of the door panel is provided with a door support member, the door support member comprises a first positioning seat, a support rod rotatably installed in the first positioning seat in the horizontal direction, and a second positioning seat for inserting the support rod to support and position the door panel in the open state to a certain angle, one of the first positioning seat and the second positioning seat is installed on the door panel, and the other is installed on the door frame.

[0014] Further, the door support member further comprises a placing seat arranged on the same side of the first positioning seat, the placing seat is located on the same horizontal line as the first positioning seat or the second positioning seat, and is used for inserting the support rod to retract the support rod when the door panel is closed.

[0015] Further, the end of the support rod is provided with a hook, and the second positioning seat and / or the placing seat is provided with a positioning groove for inserting the hook.

[0016] Further, a door lock member is installed on the door panel, the door lock member is arranged on the outer side of the door panel and used for locking or unlocking the door panel on the door frame, and an opening member for controlling the opening of the door lock member is installed on the door lock member;

[0017] The opening member comprises a shaft rod arranged in the door lock member, a pressing block arranged on the inner side of the door plate, and an elastic member connected between the shaft rod and the pressing block.

[0018] In addition, the air purification device comprises a box body and an air purification equipment arranged in the box body, and a maintenance opening is arranged on the box body.

[0019] The sealing maintenance door has the following beneficial effects:

[0020] The sealing maintenance door is a flat door opened and closed through the hinge, has large size, is convenient for personnel and equipment to enter and exit, is beneficial to carrying and replacing the filter element in the air purification device and maintaining the equipment, and compared with the prior art, does not need to disassemble the door plate or the door frame when entering the air purification device, is simple to operate, saves time and effort. The outer frame of the door plate and the inner frame of the door frame are correspondingly arranged as the stepped structure that can be mutually clamped, can form multi-layer corner sealing, can make rainwater flow downwards along the edge when the rainwater and the like leaks outside, avoids the rainwater from penetrating into the inner side of the door plate along the wallboard, and guarantees the sealing property of the sealing maintenance door. The first sealing strip and the second sealing strip are arranged at the corner positions between the door plate and the door frame in the stepped structure, can form two sealing layers between the inner and outer sides of the door plate, greatly improves the sealing effect, the first sealing strip is arranged at the corner position close to the outer side of the door plate to serve as the first sealing layer, prevents external substances from entering, and the first sealing strip has good compressibility, can absorb the installation error between the door plate and the door frame, reduces the gap caused by the installation error, the second sealing strip is arranged at the corner position close to the inner side of the door plate to serve as the second sealing layer, can abut against the wall surface of the door frame or the maintenance opening of the air purification device, and guarantees the sealing of the whole combined surface; in the two sealing layers, the stress directions of the first sealing strip and the second sealing strip are different, and the stress sizes are different, so that the first sealing strip and the second sealing strip can mutually compensate the defects that may occur during sealing, realize the two-fold guarantee of the opening air tightness between the door plate and the door frame, and have good sealing effect. Preferably, the sealing maintenance door of the utility model adopts a steel structure, has large rigidity, is firm in structure, can bear large negative pressure, can prevent the door plate from being deformed to generate a deformation gap in the negative pressure environment, avoids external substances from entering the air purification device through the deformation gap, guarantees the effectiveness of the air inlet system in the air purification device, and improves the service life.

[0021] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The utility model will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are intended to explain the aspects of the application and are not intended in any way to limit the present application. In the drawings:

[0023] Figure 1 is a front view of the sealing access door of the preferred embodiment of the present application;

[0024] Figure 2 is a structural view of the sealing access door of the preferred embodiment of the present application;

[0025] Figure 3 is a sectional view of the sealing access door of the preferred embodiment of the present application;

[0026] Figure 4 is an enlarged view of A of the sealing access door of the preferred embodiment of the present application;

[0027] Figure 5 is a structural view of the opening member of the preferred embodiment of the present application.

[0028] Legend:

[0029] 100, door frame; 200, door panel; 300, sealing member; 301, steel plate; 302, first sealing strip; 303, second sealing strip; 400, door support member; 401, first positioning seat; 402, second positioning seat; 403, support rod; 500, door lock member; 600, opening member; 601, shaft rod; 602, pressing block; 603, elastic member. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered below.

[0031] As shown in Figure 1 and Figure 3 , the sealing access door of the present embodiment comprises a door frame 100, a door panel 200 hingedly connected to one side of the door frame 100, and a sealing member 300 arranged between the door panel 200 and the door frame 100 and used for sealing. Specifically, the door panel 200 and the door frame 100 of the sealing access door are opened and closed through hinge cooperation, and the door panel 200 is large in size, facilitating the entry and exit of personnel and equipment, facilitating the replacement and maintenance operation of the equipment, and compared with the prior art, the door panel 200 or the door frame 100 does not need to be disassembled when entering the sealing access door, the operation is simple, time-saving and labor-saving, and the work efficiency is high.

[0032] As shown in Figure 1 and Figure 3As shown, the inner frame of the door frame 100 and the outer frame of the door plate 200 are correspondingly arranged as a stepped structure that can be engaged with each other. The multiple layers of corners formed by the stepped structure can make the rainwater flow down along the edge when the rainwater and the like seep outside, so as to avoid the rainwater from extending into the inside of the door plate 200 along the wall plate, and ensure the sealing property of the sealing access door. The sealing member 300 includes a first sealing strip 302 and a second sealing strip 303 arranged in sequence along the direction from the outside to the inside of the door plate 200. The first sealing strip 302 and the second sealing strip 303 are both installed at the corner of the stepped structure, and are used to abut against the frame of the door frame 100 and / or the door plate 200 to form two seals. Specifically, in the embodiment, one end of the first sealing strip 302 is fixedly attached to the inner frame of the door frame 100, and the other end is arranged towards the outside of the door plate 200, so as to abut against the door plate 200 at a position close to the outside of the door plate 200 to form a first seal. The second sealing strip 303 is fixedly attached to the outer frame of the door plate 200 and is arranged protruding towards the inner frame of the door frame 100, so as to abut against the door frame 100 at a position close to the inside of the door plate 200 to form a second seal. The two seals are cooperated to realize the sealing between the door plate 200 and the door frame 100. Alternatively, in another embodiment, one end of the first sealing strip 302 can also be fixedly attached to the outer frame of the door plate 200, and the other end is arranged towards the inside of the door plate 200 to abut against the door frame 100 to form a seal.

[0033] By installing the first sealing strip 302 and the second sealing strip 303 at the corner position between the door plate 200 and the door frame 100 in the stepped structure, two seals can be formed between the inside and the outside of the door plate 200, so as to greatly improve the sealing effect. The first seal formed by the first sealing strip 302 can prevent external substances from entering, and the first sealing strip 302 has good compressibility, can absorb the installation error between the door plate 200 and the door frame 100, and reduce the gap caused by the installation error. The second seal formed by the second sealing strip 303 can abut against the access opening wall surface of the clean air device or the door frame 100 to ensure the sealing of the entire combined surface. In the two seals, the stress directions of the first sealing strip 302 and the second sealing strip 303 are different, and the stress sizes are different, so that the first sealing strip 302 and the second sealing strip 303 can compensate for the defects that may occur during sealing, realize the two-fold protection of the opening air tightness between the door frame 100 and the door plate 200, and have high sealing performance. In addition, the arrangement of the first sealing strip 302 and the second sealing strip 303 can greatly reduce the noise, and can meet the working conditions with high noise reduction requirements.

[0034] As shown in FIG. 1, the sealing access door includes a door frame 100 and a door plate 200. The door frame 100 is arranged on the wall plate 10, and the door plate 200 is arranged on the door frame 100. The door plate 200 is used to open and close the access opening of the clean air device, and the door frame 100 is used to support the door plate 200. Figure 3 and Figure 4As shown, the outer surfaces of the door frame 100 and the door plate 200 are both coated with steel plates 301. The door plate 200 and the door frame 100 coated with the steel plates 301 have great rigidity, firm structure, can withstand greater negative pressure, long service life, can prevent the door plate 200 from deforming in a negative pressure environment or due to frequent opening and closing, avoid external impurities entering the inside of the door plate 200 through the deformation gap, and effectively improve the sealing effect. Preferably, the steel plates 301 of the door plate 200 and the door frame 100 are subjected to welding seam pickling passivation treatment, have good corrosion resistance and anti-aging performance, and can be suitable for harsh environments with high salt content and high corrosion. Preferably, the outer surface of the steel plate 301 is coated with a sealing gasket to further improve the sealing performance.

[0035] In the present embodiment, the first sealing strip 302 is arranged close to the outer side of the door plate 200, one end of the first sealing strip 302 is fixed to the steel plate 301 at the inside corner of the door frame 100, and the other end is arranged towards the outer side of the door plate 200 to form a first sealing surface between the steel plate 301 of the door plate 200 along the opening and closing direction of the door plate 200. The first sealing surface can form the first sealing for the sealing access door to prevent external substances from entering the door, and can also absorb the installation error between the door plate 200 and the door frame 100 to reduce the gap caused by the installation error. The first sealing strip 302 is arranged between the two steel plates 301 on the door frame 100 and the door plate 200, and forms a double-layer clamping structure with the two steel plates 301, which can greatly enhance the mechanical strength of the first sealing strip 302, making it more solid and durable, and can resist external force and impact generated by the opening and closing of the door plate 200. It can effectively prolong the service life and performance stability of the first sealing strip 302, and the double-layer steel plate clamping structure can make the first sealing strip 302 better fit the gap that needs to be sealed, reduce the possibility of leakage and penetration, and improve the sealing effect. Alternatively, in another embodiment, one end of the first sealing strip 302 can also be fixed to the outer frame of the door plate 200, and the other end can be arranged towards the inner side of the door plate 200 to abut against the door frame 100 for sealing.

[0036] As shown in Figure 3 and Figure 4 , the cross-sectional shape of the first sealing strip 302 is D-shaped, the planar end of the first sealing strip 302 is parallel to the door plate 200 and is fixedly attached to the steel plate 302, which can ensure the close fit between the first sealing strip 302 and the steel plate 301, avoid gaps in the fixed surface, and the first sealing strip 302 adopts a hollow structure with a D-shaped cross-section, which has good elasticity and good compressibility, is beneficial to resist external force and impact generated by the opening and closing of the door plate 200, and is more beneficial to absorb the installation error between the door plate 200 and the door frame 100, thereby enhancing the sealing effect.

[0037] As shown in Figure 3 and Figure 4As shown, the outer frame of the door plate 200 is provided with a groove, which is arranged towards the direction of the door frame 100 for clamping and fixing the second sealing strip 303. The steel plate 301 on the door plate 200 extends and is inserted into the second sealing strip 303 to be sealingly connected with the second sealing strip 303, so as to enhance the connection strength of the second sealing strip 303 and prevent the second sealing strip 303 from being pulled out of the door plate 200, thereby ensuring the sealing stability. The second sealing strip 303 is protrudingly arranged towards the inner frame of the door frame 100 to form a second sealing surface along the opening and closing direction perpendicular to the door plate 200. Specifically, the protruding end of the second sealing strip 303 can abut against at least one of the door frame 100, the steel plate 301 on the door frame 100, or the access hole to be installed to form the second sealing surface. The second sealing surface is arranged close to the inner side of the door plate 200 to form a second sealing for the sealing access door, so as to seal the inside of the sealing access door and further enhance the sealing effect. Preferably, the groove is matched with the shape of the second sealing strip 303, so that the sealing area of the second sealing formed by the second sealing strip 303 is increased, the sealing performance is effectively enhanced, and the structure is stable and not easy to deform.

[0038] As shown in Figure 3 and Figure 4 , the second sealing strip 303 includes an annular closed section and a U-shaped opening section fixed on the annular closed section. The annular closed section is arranged close to the inner side of the door plate 200, and the opening of the U-shaped opening section is arranged towards the direction of the door frame 100. The end of the steel plate 301 on the door plate 200 extends and is inserted into the U-shaped opening section to realize the sealing connection with the second sealing strip 303. Specifically, the U-shaped opening section is embedded in the door plate 200, and the annular closed section protrudes from the inner frame of the door plate 200 towards the direction of the door frame 100 to form a second sealing surface through the protruding end of the annular closed section. Thus, the second sealing strip 303 can be stably connected with the door plate 200 and the steel plate 301 through the U-shaped opening section, so as to avoid the second sealing being invalid due to the second sealing strip 303 being pulled out of the door plate 200. In addition, the second sealing strip 303 has good elasticity and good applicability, can adapt to various deformations, can be adapted to different fitting surfaces, ensures the close fitting of the sealing surface, and improves the sealing effect. Preferably, the cross-sectional shape of the second sealing strip 303 is P-shaped.

[0039] Therefore, the first sealing strip 302 is subjected to a force parallel to the door plate 200 during sealing, and the second sealing strip 303 is subjected to a force perpendicular to the door plate 200 during sealing. By arranging the first sealing strip 302 and the second sealing strip 303 to be subjected to different force directions, it can be avoided that the first sealing strip 302 and the second sealing strip 303 fail simultaneously in some abnormal situations, such as insufficient force applied by the door plate 200 to the first sealing strip 302 or the second sealing strip 303, thereby guaranteeing the sealing effect of the sealing access door. Preferably, the first sealing strip 302 and the second sealing strip 303 are both made of rubber material, which is wear-resistant, high-temperature-resistant, and has a long service life, and is suitable for the frequent opening and closing of the sealing access door. In addition, the first sealing strip 302 and the second sealing strip 303 can be recycled, which meets the requirements of green building materials.

[0040] As shown in Figure 1 , Figure 2 and Figure 3 , the inner side of the door plate 200 is provided with a door support member 400. The door support member 400 includes a first positioning seat 401, a support rod 403 rotatably mounted in the first positioning seat 401 in the horizontal direction, and a second positioning seat 402 for inserting the support rod 403 to support and position the door plate 200 in the open state to a certain angle. One of the first positioning seat 401 and the second positioning seat 402 is mounted on the door plate 200, and the other is mounted on the door frame 100. Specifically, in this embodiment, the first positioning seat 401 is arranged on the inner side of the door plate 200 and fixed thereto, and the second positioning seat 402 is arranged on the same horizontal plane as the first positioning seat 401 and mounted on the inner frame of the door frame 100. A threaded hole is formed in the first positioning seat 401 in the vertical direction, and a screw is threadedly connected in the threaded hole. One end of the support rod 403 is movably arranged on the screw to realize the rotatable connection with the first mounting seat, and the other end is used to form a connection with the second positioning seat 402 to support the door plate 200 open. Therefore, after the operator enters the sealing access door, the door plate 200 can be supported and positioned to remain in the open state by operating the support rod 403, thereby avoiding the door plate 200 from closing due to wind blowing and the like, and ensuring the safety of the personnel inside. Alternatively, the first positioning seat 401 can be fixed on the door frame 100, and the second positioning seat 402 can be fixed on the door plate 200.

[0041] When it is needed to prop open the door panel 200 and fix it in the open state, the prop bar 403 on the first positioning seat 401 is rotated to be inserted into the second positioning seat 402, the door panel 200 is adjusted to the required open angle, then the screw on the first positioning seat 401 is screwed to fix the position of the prop bar 403, and the prop bar 403 on the second positioning seat 402 is locked, so as to realize the support and positioning of the door panel 200, prevent the door panel 200 from being closed due to the wind force, and improve the safety. Preferably, in the embodiment, the prop bar 403 can support and position the door panel 200 in the open state of 90°. Alternatively, one end of the prop bar 403 can also be rotatably installed in the second positioning seat 402, and the support and positioning of the door panel 200 is realized by inserting the prop bar 403 into the first positioning seat.

[0042] As shown in Figure 2 and Figure 3 , the door prop 400 further comprises a placing seat arranged on the same side as the first positioning seat 401, the placing seat is located on the same horizontal line as the first positioning seat 401 or the second positioning seat 402, and is used for inserting the prop bar 403 to retract the prop bar when the door panel is closed. When it is needed to close the door panel 200, the screw on the first positioning seat 401 is loosened to make the prop bar 403 rotatable, the end of the prop bar 403 away from the first positioning seat 401 is taken out of the second positioning seat 402, the prop bar 403 is rotated around the first positioning seat 401 and inserted into the placing seat, so as to realize the retraction of the prop bar 403 and avoid the influence of the prop bar 403 on the door closing operation. Alternatively, one end of the prop bar 403 can also be rotatably installed in the second positioning seat 402, and the support and positioning of the door panel 200 is realized by inserting the prop bar 403 into the first positioning seat 401. Correspondingly, the placing seat can also be arranged on the door frame 100 to retract and store the used prop bar 403.

[0043] As shown in Figure 2 and Figure 3 , the end of the prop bar 403 is provided with a hook, and the second positioning seat 402 and / or the placing seat is provided with a positioning groove for inserting the hook, so that the prop bar 403 can be quickly hung in the second positioning seat 402 or the placing seat through the cooperation of the hook and the positioning groove, the prop bar 403 is prevented from falling out, the stability of the positioning of the door prop 400 is improved, and the work efficiency is improved.

[0044] As shown in Figure 1 , Figure 2 and Figure 5As shown, the door plate 200 is provided with a door lock 500, which is preferably arranged on the side of the door plate 200 away from the hinged end and on the outer side of the door plate 200, and is used to fasten or release the door plate 200 on the door frame 100. The door lock 500 is provided with an opening device 600 used to control the opening of the door lock 500. Specifically, the door lock 500 comprises a lock body fixed on the door plate 200, a lock tongue arranged in the lock body, and a handle connected to the lock tongue and used to control the lock tongue to extend into or out of the door frame 100. The opening device 600 comprises a shaft 601 arranged in the lock body, a pressing block 602 arranged on the inner side of the door plate 200, and an elastic member 603 connected between the shaft 601 and the pressing block 602, and the end of the shaft 601 away from the spring is connected to the handle. Preferably, the elastic member 603 is a spring, and the two ends of the spring are fixed with the shaft 601 and the pressing block 602, respectively. Thus, the pressing block 602 can be pressed outward by the elastic member 603 to drive the shaft 601 to keep out of the door lock 500, and the shaft 601 can be unlocked by pressing the pressing block 602 to release the locking between the lock tongue and the door frame 100, so that the operator can open the sealed access door without the aid of auxiliary equipment on the inner side of the door plate 200, and prevent being trapped by mistake. When the pressing block 602 is released, the pressing block 602 can be restored to the original position by the elastic member 603. Preferably, the pressing block 602 is in the mushroom head structure, and the pressing block 602 is provided with a prompt mark.

[0045] Preferably, the door plate 200 is provided with a transparent observation window, through which the situation on the inner side of the door plate 200 can be observed from the outer side of the door plate 200, so as to facilitate timely maintenance.

[0046] In addition, a clean air device is also provided, which comprises a box body and a clean air equipment arranged in the box body, and the box body is provided with an access opening. The clean air device further comprises the sealed access door, which is arranged on the access opening. Preferably, in the embodiment, the sealed access door is installed by intermittently welding and pasting the door frame 100 on the access opening, so as to avoid deformation of the clean air device and ensure reliable sealing.

[0047] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sealed access door, characterized in that, it comprises a door frame (100), a door panel (200) hinged to one side of the door frame (100), and a sealing member (300) arranged between the door frame (100) and the door panel (200) and used for sealing; the inner frame of the door frame (100) and the outer frame of the door panel (200) are correspondingly arranged as a stepped structure that can be engaged with each other, the sealing member (300) comprises a first sealing strip (302) and a second sealing strip (303) arranged in sequence along the direction from the outer side to the inner side of the door panel (200), and the first sealing strip (302) and the second sealing strip (303) are both installed at the corner of the stepped structure and used for abutting against the door frame (100) and / or the door panel (200) to form two seals.

2. The sealed access door according to claim 1, characterized in that, the outer surfaces of the door frame (100) and the door panel (200) are both covered with a steel plate (301), the first sealing strip (302) is fixed to the steel plate (301) at the inside corner of the door frame (100) and used for forming a first sealing surface along the opening and closing direction of the door panel (200) with the door panel (200); the second sealing strip (303) is fixed to the steel plate (301) at the inside corner of the door panel (200) and used for forming a second sealing surface perpendicular to the opening and closing direction of the door panel (200) with the door frame (100).

3. The sealed access door according to claim 2, characterized in that, the cross-sectional shape of the first sealing strip (302) is D-shaped, and the planar end of the first sealing strip (302) is parallel to the door panel (200) and is fixed to the steel plate (301).

4. The sealed access door according to claim 2, characterized in that, a groove is formed in the outer frame of the door panel (200) towards the door frame (100), the second sealing strip (303) is clamped in the groove and protrudes towards the door frame (100); the steel plate (301) on the door panel (200) is sealingly inserted into the second sealing strip (303).

5. The sealed access door according to claim 4, characterized in that, the second sealing strip (303) comprises a ring-shaped closed section and a U-shaped open section, the ring-shaped closed section is arranged close to the inner side of the door panel (200) and used for abutting against the door frame (100), and the opening of the U-shaped open section is arranged towards the door frame (100) to allow the end of the steel plate (301) on the door panel (200) to be sealingly inserted.

6. The sealed access door according to claim 1, characterized in that, The inner side of the door plate (200) is provided with a door support (400), the door support (400) comprises a first positioning seat (401), a support rod (403) rotatably mounted in the first positioning seat (401) in a horizontal direction, and a second positioning seat (402) for inserting the support rod (403) to support and position the door plate (200) in an open state to a certain angle, one of the first positioning seat (401) and the second positioning seat (402) is mounted on the door plate (200), and the other is mounted on the door frame (100).

7. The sealed access door according to claim 6, wherein, The door support (400) further comprises a placing seat provided on the same side of the first positioning seat (401), the placing seat is located on the same horizontal line as the first positioning seat (401) or the second positioning seat (402), and is used for inserting the support rod (403) to retract the support rod (403) when the door plate (200) is closed.

8. The sealed access door according to claim 7, wherein, The end of the support rod (403) is provided with a hook, and the second positioning seat (402) and / or the placing seat is provided with a positioning groove for inserting the hook.

9. The sealed access door according to claim 1, wherein, A door lock (500) is mounted on the door plate (200), the door lock (500) is provided on the outer side of the door plate (200) and is used for buckling or loosening the door plate (200) on the door frame (100), and an opening device (600) for controlling the opening of the door lock (500) is mounted on the door lock (500); The opening device (600) comprises a shaft rod (601) penetrating into the door lock (500), a pressing block (602) provided on the inner side of the door plate (200), and an elastic member (603) connected between the shaft rod (601) and the pressing block (602), the shaft rod (601) is connected to the door lock (500), and the elastic member (603) is used for outwardly pressing the pressing block (602) to drive the shaft rod (601) to remain in a state of being separated from the door lock (500), the pressing block (602) is used for being pressed and driving the shaft rod (601) to unlock the door lock (500), so as to release the buckling between the door lock (500) and the door frame (100).

10. A gas purification device comprising a box body and a gas purification equipment provided in the box body, and an access opening is formed in the box body, characterized in that, The gas purification device further comprises the sealed access door according to any one of claims 1 to 9, and the sealed access door is mounted on the access opening.

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