阅读说明：本技术 一种基于热固性树脂浸渍防火门用启闭设备 (Fire door is with starting and stopping equipment based on thermosetting resin flooding ) 是由 朱元康 于 2020-12-02 设计创作，主要内容包括：本发明公开了防火门启闭技术领域的一种基于热固性树脂浸渍防火门用启闭设备,包括闭门器主体和闭门器连杆,所述闭门器主体包括闭门器壳体,所述闭门器壳体包括外壳,所述外壳的内部分为液压腔和气压腔,所述液压腔为左右两端开口的圆柱状空腔,所述气压腔为前方开口的方型空腔,所述气压腔的顶壁开设有充气嘴,火场温度较高,气压腔中惰性气体发生膨胀,气压将受力板向液压腔方向挤压,受力板通过连柱推动推条向液压腔的中轴线处靠拢,使得推条将活塞条推向液压腔的中轴线处靠拢,活塞条的外侧壁与液压腔的腔壁不再接触,使得液压腔的液压油能够从活塞条的外侧壁与液压腔的腔壁之间流通,有利于加快开关门时液压腔中液压油的流动效率。(The invention discloses an opening and closing device for a fireproof door based on thermosetting resin impregnation, which belongs to the technical field of opening and closing of fireproof doors, and comprises a door closer main body and a door closer connecting rod, wherein the door closer main body comprises a door closer shell, the door closer shell comprises a shell, the interior of the shell is divided into a hydraulic cavity and a pneumatic cavity, the hydraulic cavity is a cylindrical cavity with openings at the left end and the right end, the pneumatic cavity is a square cavity with an opening in the front, the top wall of the pneumatic cavity is provided with an inflating nozzle, the temperature of a fire field is higher, inert gas in the pneumatic cavity expands, the pneumatic pressure extrudes a stress plate towards the direction of the hydraulic cavity, the stress plate pushes a push strip to be close to the central axis of the hydraulic cavity through a connecting column, so that the push strip pushes a piston strip to be close to the central axis of the hydraulic cavity, the outer side wall of the piston strip is not in contact with the cavity wall of the hydraulic cavity any more, the flow efficiency of the hydraulic oil in the hydraulic cavity is accelerated when the door is opened and closed.)

1. The utility model provides a based on thermosetting resin flooding start and stop equipment for fire door, includes door closer main part (100) and door closer connecting rod (200), its characterized in that: the door closer main body (100) comprises a door closer shell (300), the door closer shell (300) comprises a shell (310), the inside of the shell (310) is divided into a hydraulic cavity (301) and a pneumatic cavity (302), the hydraulic cavity (301) is a cylindrical cavity with openings at the left end and the right end, the pneumatic cavity (302) is a square cavity with an opening in the front, the top wall of the pneumatic cavity (302) is provided with an inflating nozzle (01), the front wall of the hydraulic cavity (301) is uniformly provided with piston holes (303), the rear wall of the pneumatic cavity (302) is uniformly provided with spring cavities (304), and the front wall of the hydraulic cavity (301) is provided with a push bar caulking groove (305);

the hydraulic cavity structure is characterized in that the inner cavity of the hydraulic cavity (301) is filled with hydraulic oil, hydraulic cavity end covers (320) are mounted at openings of the left end and the right end of the hydraulic cavity (301), an air pressure cavity end cover (330) is mounted at an opening in the front of the air pressure cavity (302), a hydraulic oil channel (306) is arranged in the wall body of the shell (310), two ends of the hydraulic oil channel (306) are communicated with the inner cavity of the hydraulic cavity (301), and two ends of the hydraulic oil channel (306) are respectively provided with an adjusting valve (400);

the door closer comprises a hydraulic cavity (301), transmission piece mounting grooves (311) are formed in the upper cavity wall and the lower cavity wall of the hydraulic cavity (301), a transmission piece (500) is mounted in an inner cavity of the hydraulic cavity (301), the transmission piece (500) comprises a rotating rod (510), the bottom end of the rotating rod (510) is mounted in a groove cavity of the transmission piece mounting groove (311), the top of the rotating rod (510) penetrates through the transmission piece mounting groove (311) in the upper cavity wall of the hydraulic cavity (301), a sealing ring is uniformly embedded in the inner cavity wall of the transmission piece mounting groove (311) in the upper cavity wall of the hydraulic cavity (301), a connecting block (511) is arranged at the top end of the rotating rod (510), one end of a door closer connecting rod (200) is fixedly connected with the connecting block (511), and a gear;

a rack plunger (600) and a plunger spring (700) are installed in an inner cavity of the hydraulic cavity (301), and the plunger spring (700) is located right to the rack plunger (600);

the rack plunger (600) comprises a rack (610), plungers (620) are fixedly connected to the left end and the right end of the rack (610), the plungers (620) are disc-shaped piston blocks, a conical valve port (621) is formed in the middle of each plunger (620), wide ports of the conical valve ports (621) of the two groups of plungers (620) are distributed towards the left end and the right end of the hydraulic cavity (301), a valve frame (001) is fixedly mounted on the inner wall of a narrow port of each conical valve port (621), a valve ball (002) is mounted in the middle of each valve frame (001), a communication port (622) is formed in the front end of each plunger (620), a communication port spring cavity (623) is uniformly formed in the rear wall of each communication port (622), and a piston assembly (630) is arranged in front of the rack (610);

the inner cavity of the air pressure cavity (302) is filled with inert gas, and the inner cavity of the air pressure cavity (302) is provided with a push bar assembly (800); push away a subassembly (800) including atress board (810), the positive rear of atress board (810) is provided with and pushes away strip (820), push away the antetheca at both ends all and be connected with even post (830) about strip (820), the front end of even post (830) is connected with the back wall of atress board (810), the body of rod of even post (830) has cup jointed even post spring (840) and bellows (003).

2. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 1, characterized in that: piston hole (303) and spring chamber (304) are respectively two sets ofly, and are two sets of piston hole (303) are bilateral symmetry form setting, piston hole (303) and spring chamber (304) are coaxial heart form and are linked together, the pore wall of piston hole (303) evenly inlays and is equipped with the sealing washer, hydraulic pressure chamber (301) are through piston hole (303) and spring chamber (304) intercommunication atmospheric pressure chamber (302), push away the inner chamber at the left and right sides both ends of strip caulking groove (305) respectively with two sets of the back port of piston hole (303) is linked together.

3. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 1, characterized in that: inner chamber wall is the internal thread structure about hydraulic pressure chamber (301) both ends opening part, hydraulic pressure chamber end cover (320) is the dome of external screw thread structure, the external screw thread of hydraulic pressure chamber end cover (320) and the internal thread looks spiro union of hydraulic pressure chamber (301), the even screw hole of seting up of both ends opening part outer end wall about hydraulic pressure chamber (301), the jack has evenly been seted up to the eaves of hydraulic pressure chamber end cover (320) outer end, the jack of hydraulic pressure chamber end cover (320) eaves is aligned with the screw hole of hydraulic pressure chamber (301) outer end wall, and jack and screw hole pass through bolt-up and are connected.

4. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 1, characterized in that: threaded connection holes are formed in four corners of an opening in the front of the air pressure cavity (302), plug holes are formed in four corners of an end cover (330) of the air pressure cavity, the end cover (330) of the air pressure cavity is embedded in an inner cavity of the opening in the front of the air pressure cavity (302), the plug holes in the four corners of the end cover (330) of the air pressure cavity are aligned with the threaded connection holes in the four corners of the opening in the front of the air pressure cavity (302), the plug holes and the threaded connection holes are connected in a fastening mode through bolts, a sealing gasket is wrapped on the edge of the rear wall of the end cover (330) of the air pressure cavity, the end cover (330) of the air pressure cavity seals the opening in the front of the air pressure cavity (302) through the sealing gasket.

5. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 1, characterized in that: the middle part of the valve frame (001) is a ring frame body, the outer circumferential side wall of the ring frame body is uniformly provided with radially arrayed supports, and the outer end walls of the supports are fixedly connected to the inner wall of the narrow opening of the conical valve port (621).

6. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 5, characterized in that: the valve ball (002) is a rubber ball plug, the valve ball (002) is located in an inner cavity of the conical valve port (621), a straight rod is fixedly connected to the spherical surface of the valve ball (002), and the straight rod is inserted into an annular cavity of an annular frame body in the middle of the valve frame (001).

7. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 1, characterized in that: the cavity of intercommunication mouth (622) link up the front end wall of plunger (620) and the left and right sides wall of front end wall, piston assembly (630) includes piston strip (631), both ends are pegged graft respectively two sets of about piston strip (631) in intercommunication mouth (622) of plunger (620), the back wall at both ends evenly is connected with inserted bar (632) about piston strip (631), inserted bar (632) are with the axle center setting with intercommunication mouth spring chamber (623), and the rear end portion grafting of inserted bar (632) is in the vestibule of intercommunication mouth spring chamber (623), piston strip spring (633) have been cup jointed on the body of rod of inserted bar (632), piston strip spring (633) set up in the vestibule of intercommunication mouth spring chamber (623).

8. The opening and closing device for the fire door based on thermosetting resin impregnation according to claim 1, characterized in that: stress plate (810) and push away strip (820) and evenly be the lamella, the body of rod fixed cup joint of even post (830) supports piece (831), even post spring (840) sets up the one side that supports piece (831), and links post spring (840) and be located the inner chamber of spring chamber (304), bellows (003) set up the opposite side that supports piece (831), the one end fixed connection of bellows (003) is on the face of stress plate (810), and the other end fixed connection of bellows (003) is on the back chamber wall of the inner chamber of pneumatic chamber (302), stress plate (810) are located the inner chamber of pneumatic chamber (302), it is located the vallecular cavity of pushing away strip caulking groove (305) to push away strip (820), even post (830) run through piston hole (303) and spring chamber (304).

Technical Field

The invention relates to the technical field of opening and closing of fireproof doors, in particular to an opening and closing device for a fireproof door based on thermosetting resin impregnation.

Background

The door closer is a hydraulic press similar to a spring on the door head, can be released after being compressed after the door is opened, automatically closes the door, has the effect like a spring door, and can ensure that the door is accurately and timely closed to an initial position after being opened.

In general, when the door is opened, a large force is applied to the door body, and when the door is closed, the door is slowly closed by the door closer.

For a fire scene, people in the crowd are in a hurry to escape in the fire scene, the emotion is nervous and uneasy, when a closed door fireproof door is encountered, great force needs to be applied when the door is pushed, although the obvious negative influence on opening the fireproof door at ordinary times can not be caused, at the moment, the negative emotion is further expanded easily due to various incompliances when the people in the fire scene are in various negative emotions of big fire, and the negative emotion of the people can be undoubtedly increased due to the difficult opening of the fireproof door.

In addition, as the fireproof door is generally thick and heavy, the process of automatically closing the opened fireproof door under the action of the door closer is slow, and for a fire scene, people who escape through the fireproof door cannot give full attention to closing the fireproof door. However, when the fireproof door is not closed in time, air in the channel between the outside and the inside of the door is easy to flow, so that the fire tongue spreads along the flowing air, and the fire is enhanced.

Based on the above, the invention designs the opening and closing equipment for the fireproof door based on thermosetting resin impregnation, so as to solve the problems.

Disclosure of Invention

The invention aims to provide an opening and closing device for a fireproof door based on thermosetting resin impregnation, which aims to solve the problems that people in the crowd are in urgent need to escape in a fire scene and have nervous emotion in the fire scene, when the closed fireproof door is encountered, great force needs to be applied in pushing the door, although the opening of the fireproof door is not obviously influenced in normal times, at the moment, people in the fire scene are easy to further expand negative emotion due to various incompliances under various negative emotions of big fire, the difficulty in opening the fireproof door can undoubtedly increase the negative emotion of people, the opened fireproof door is generally thick and heavy, the self-closing process of the opened fireproof door under the action of a door closer is slow, and for the fire scene, the escaping crowd cannot help to close the fireproof door after passing through the fireproof door, however, the fire door is not closed in time, and air in the channel between the outside and the inside of the door is easy to flow, so that the fire tongue spreads along the flowing air, and the fire is enhanced.

In order to achieve the purpose, the invention provides the following technical scheme: the opening and closing equipment for the fireproof door based on thermosetting resin impregnation comprises a door closer main body and a door closer connecting rod, wherein the door closer main body comprises a door closer shell, the door closer shell comprises a shell, the interior of the shell is divided into a hydraulic cavity and a pneumatic cavity, the hydraulic cavity is a cylindrical cavity with openings at the left end and the right end, the pneumatic cavity is a square cavity with an opening in the front, an inflation nozzle is arranged on the top wall of the pneumatic cavity, piston holes are uniformly arranged on the front wall of the hydraulic cavity, a spring cavity is uniformly arranged on the rear wall of the pneumatic cavity, and a push bar caulking groove is arranged on the front wall of the hydraulic cavity;

the hydraulic cavity is characterized in that the inner cavity of the hydraulic cavity is filled with hydraulic oil, hydraulic cavity end covers are mounted at openings of the left end and the right end of the hydraulic cavity, a pneumatic cavity end cover is mounted at an opening in front of the pneumatic cavity, a hydraulic oil channel is formed in the wall body of the shell, two ends of the hydraulic oil channel are communicated with the inner cavity of the hydraulic cavity, and regulating valves are mounted at two ends of the hydraulic oil channel;

the door closer comprises a hydraulic cavity, a door closer connecting rod, a transmission part, a rotating rod and a sealing ring, wherein transmission part mounting grooves are formed in the upper cavity wall and the lower cavity wall of the hydraulic cavity, the transmission part is mounted in the inner cavity of the hydraulic cavity, the transmission part comprises a rotating rod, the bottom end of the rotating rod is mounted in the groove cavity of the transmission part mounting groove, the top of the rotating rod penetrates through the transmission part mounting groove in the upper cavity wall of the hydraulic cavity, the inner cavity wall of the transmission part mounting groove in the upper cavity wall of the hydraulic cavity is uniformly embedded with the sealing ring;

a rack plunger and a plunger spring are arranged in an inner cavity of the hydraulic cavity, and the plunger spring is positioned right to the rack plunger;

the rack plunger comprises a rack, plungers are fixedly connected to the left end and the right end of the rack, the plungers are disc-shaped piston blocks, tapered valve ports are formed in the middle of the plungers, wide ports of the tapered valve ports of the two groups of plungers are distributed towards the left end port and the right end port of the hydraulic cavity, valve frames are fixedly mounted on the inner walls of narrow ports of the tapered valve ports, valve balls are mounted in the middle of the valve frames, communication ports are formed in the front ends of the plungers, communication port spring cavities are uniformly formed in the rear walls of the communication ports, and piston assemblies are arranged in front of the rack;

the inner cavity of the air pressure cavity is filled with inert gas, and a push bar assembly is arranged in the inner cavity of the air pressure cavity; it includes the atress board to push away a subassembly, the atress board is provided with directly after and pushes away the strip, it all is connected with even post to push away the antetheca at both ends about the strip, the front end of even post is connected with the back wall of atress board mutually, the body of rod of even post has cup jointed even post spring and bellows.

Preferably, the piston hole and the spring chamber are respectively two sets, two sets of the piston holes are arranged in a bilateral symmetry mode, the piston hole and the spring chamber are communicated in a coaxial mode, a sealing ring is evenly embedded in the hole wall of the piston hole, the hydraulic chamber is communicated with the pneumatic chamber through the piston hole and the spring chamber, and inner chambers at the left end portion and the right end portion of the push bar caulking groove are respectively communicated with the rear ports of the two sets of the piston holes.

Preferably, the inner chamber wall of both ends opening part is the internal thread structure about the hydraulic pressure chamber, the hydraulic pressure chamber end cover is the dome of external screw thread structure, the external screw thread of hydraulic pressure chamber end cover and the internal thread looks spiro union in hydraulic pressure chamber, the even screw hole of seting up of both ends opening part outer end wall about the hydraulic pressure chamber, the jack has evenly been seted up to the eaves of hydraulic pressure chamber end cover outer end, the jack of hydraulic pressure chamber end cover eaves is aligned with the screw hole of hydraulic pressure chamber outer end wall, and jack and screw hole pass through bolt-up connection.

Preferably, threaded connection holes are formed in four corners of an opening in the front of the air pressure cavity, inserting holes are formed in four corners of an end cover of the air pressure cavity, the end cover of the air pressure cavity is embedded in an inner cavity of the opening in the front of the air pressure cavity, the inserting holes in the four corners of the end cover of the air pressure cavity are aligned with the threaded connection holes in the four corners of the opening in the front of the air pressure cavity, the inserting holes and the threaded connection holes are connected through bolts in a fastening mode, a sealing gasket is wrapped at the edge of the rear wall of the end cover of the air pressure cavity, the end cover of the air pressure cavity seals the opening in the front of the air pressure.

Preferably, the middle part of the valve frame is a circular ring frame body, the outer circumferential side wall of the circular ring frame body is uniformly provided with radially arrayed supports, and the outer end walls of the supports are fixedly connected to the inner narrow opening walls of the conical valve ports.

Preferably, the valve ball is a rubber ball plug and is positioned in an inner cavity of the conical valve port, a straight rod is fixedly connected to the spherical surface of the valve ball, and the straight rod is inserted into an annular cavity of an annular frame body in the middle of the valve frame.

Preferably, the cavity of the communicating port penetrates through the front end wall of the plunger and the left and right side walls of the front end wall of the plunger, the piston assembly comprises a piston strip, the left and right ends of the piston strip are respectively inserted into the communicating ports of the two groups of plungers, the rear walls of the left and right ends of the piston strip are uniformly connected with inserting rods, the inserting rods and the communicating port spring cavities are coaxially arranged, the rear end parts of the inserting rods are inserted into the hole cavities of the communicating port spring cavities, piston strip springs are sleeved on rod bodies of the inserting rods, and the piston strip springs are arranged in the hole cavities of the communicating port spring cavities.

Preferably, the atress board evenly is the slab form with pushing away the strip, the fixed cover of the body of rod of even post has connect and has supported the piece, even the post spring sets up in the one side that supports the piece, and even the post spring is located the inner chamber in spring chamber, the bellows sets up the opposite side that supports the piece, the one end fixed connection of bellows is on the face of atress board, and the other end fixed connection of bellows is on the back chamber wall of the inner chamber in air pressure chamber, the atress board is located the inner chamber in air pressure chamber, it is located the vallecular cavity of pushing away the strip caulking groove to push away the strip, even the post runs through piston hole and spring chamber.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the non-combustible inert gas is filled in the air pressure cavity, when a fire disaster occurs, the temperature of a fire scene is higher, so that the inert gas in the air pressure cavity expands, namely the internal pressure of the air pressure cavity is increased, the stress plate is extruded towards the hydraulic cavity by utilizing the air pressure, the stress plate pushes the push strip to be close to the central axis of the hydraulic cavity through the connecting column, the push strip pushes the piston strip to be close to the central axis of the hydraulic cavity, the outer side wall of the piston strip is not in contact with the cavity wall of the hydraulic cavity any more, so that the hydraulic oil in the hydraulic cavity can circulate between the outer side wall of the piston strip and the cavity wall of the hydraulic cavity, and the flowing efficiency of the hydraulic oil in the hydraulic cavity during opening and.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural view of the present invention;

FIG. 3 is a schematic view of a main structure of the door closer of the present invention;

FIG. 4 is a schematic structural diagram of a door closer main body according to the second embodiment of the present invention;

FIG. 5 is a top view of the present invention shown in FIG. 4;

fig. 6 is a schematic structural view of a door closer housing of the present invention;

FIG. 7 is an enlarged view taken at B of FIG. 6 in accordance with the present invention;

FIG. 8 is a top view of the present invention from FIG. 6;

FIG. 9 is an enlarged view of the invention at C of FIG. 8;

FIG. 10 is a schematic view of the hydraulic chamber of the present invention;

FIG. 11 is an enlarged view taken at D of FIG. 10 in accordance with the present invention;

FIG. 12 is a schematic view of the transmission member of the present invention;

FIG. 13 is a first structural view of a rack plunger according to the present invention;

FIG. 14 is a second schematic structural view of a rack plunger according to the present invention;

FIG. 15 is an assembly view of the valve cage and valve ball of the present invention;

FIG. 16 is a schematic view of a piston assembly of the present invention;

FIG. 17 is an assembly view of the piston assembly and plunger of the present invention;

FIG. 18 is a schematic structural view of a push bar assembly of the present invention;

FIG. 19 is a rear side partial schematic view of a push bar assembly in accordance with the present invention;

FIG. 20 is an enlarged view taken at A of FIG. 5 in accordance with the present invention;

FIG. 21 is an assembled view of the interior of the hydraulic chamber of the present invention;

FIG. 22 is an assembly view of the rack plunger and gear of the present invention;

FIG. 23 is a schematic view of a push bar jacking piston bar of the present invention;

FIG. 24 is an enlarged view at E of FIG. 23 according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

100-door closer body, 200-door closer connecting rod, 300-door closer shell, 310-shell, 311-transmission piece installation groove, 301-hydraulic cavity, 302-pneumatic cavity, 01-charging nozzle, 303-piston hole, 304-spring cavity, 305-push bar caulking groove, 306-hydraulic oil channel, 320-hydraulic cavity end cover, 330-pneumatic cavity end cover, 400-regulating valve, 500-transmission piece, 510-rotating rod, 511-connecting block, 520-gear, 600-rack plunger, 610-rack, 620-plunger, 621-cone valve port, 001-valve frame, 002-valve ball, 622-communication port, 623-communication port spring cavity, 630-piston component, 631-piston bar, 632-inserted rod, 633-piston bar spring, 700-plunger spring, 800-push bar component, 810-stress plate, 820-push bar, 830-connecting column, 831-resisting block, 840-connecting column spring and 003-corrugated pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-24, the present invention provides a technical solution: the utility model provides a based on thermosetting resin flooding fire door is with start-stop device, including door closer main part 100 and door closer connecting rod 200, door closer main part 100 includes door closer casing 300, door closer casing 300 includes shell 310, the rear wall fixed mounting of shell 310 is on the door body of fire door, the inside of shell 310 divide into hydraulic pressure chamber 301 and pneumatic pressure chamber 302, hydraulic pressure chamber 301 is the cylindric cavity of controlling both ends open-ended, pneumatic pressure chamber 302 is the open-ended square cavity in the place ahead, charging connector 01 has been seted up to the roof of pneumatic pressure chamber 302, piston hole 303 has evenly been seted up to the antetheca of hydraulic pressure chamber 301, spring chamber 304 has evenly been seted up to the rear wall of pneumatic pressure chamber 302, push away strip caulking groove 305 has been seted up to the.

The piston holes 303 and the spring cavities 304 are respectively arranged in two groups, the two groups of piston holes 303 are arranged in a bilateral symmetry mode, the piston holes 303 and the spring cavities 304 are communicated in a coaxial mode, sealing rings are evenly embedded on the hole walls of the piston holes 303, the hydraulic cavities 301 are communicated with the air pressure cavities 302 through the piston holes 303 and the spring cavities 304, and inner cavities at the left end portion and the right end portion of the push bar caulking groove 305 are respectively communicated with rear ports of the two groups of piston holes 303.

Hydraulic pressure chamber 301's inner chamber is filled with hydraulic oil, hydraulic pressure chamber end cover 320 is all installed to hydraulic pressure chamber 301's the left and right sides both ends opening part, the inner chamber wall is the internal thread structure in the both ends opening part about hydraulic pressure chamber 301, hydraulic pressure chamber end cover 320 is the dome of external screw thread structure, the external screw thread of hydraulic pressure chamber end cover 320 and the internal thread looks spiro union of hydraulic pressure chamber 301, hydraulic pressure chamber 301 controls both ends opening part outer end wall and evenly seted up threaded hole, the jack has evenly been seted up to the eaves of the lid of hydraulic pressure chamber end cover 320 outer end, the jack of hydraulic pressure chamber end cover 320 eaves is aligned with the screw hole of hydraulic pressure chamber 301 outer.

The front opening of the air pressure cavity 302 is provided with an air pressure cavity end cover 330, four corners of the front opening of the air pressure cavity 302 are provided with threaded connection holes, four corners of the air pressure cavity end cover 330 are provided with insertion holes, the air pressure cavity end cover 330 is embedded in the inner cavity of the front opening of the air pressure cavity 302, the insertion holes at the four corners of the air pressure cavity end cover 330 are aligned with the threaded connection holes at the four corners of the front opening of the air pressure cavity 302, the insertion holes and the threaded connection holes are connected in a fastening mode through bolts, the edge of the rear wall of the air pressure cavity end cover 330 is coated with a sealing gasket, the air pressure cavity end cover 330 seals the front opening of the air pressure cavity 302 through the sealing gasket, square grooves are uniformly formed in the front wall and the rear wall of the air pressure.

A wall body of the shell 310 is provided with a hydraulic oil channel 306, two ends of the hydraulic oil channel 306 are communicated with an inner cavity of the hydraulic cavity 301, and two ends of the hydraulic oil channel 306 are provided with regulating valves 400;

the upper cavity wall and the lower cavity wall of the hydraulic cavity 301 are provided with transmission piece mounting grooves 311, the inner cavity of the hydraulic cavity 301 is provided with a transmission piece 500, the transmission piece 500 comprises a rotating rod 510, the bottom end of the rotating rod 510 is mounted in the cavity of the transmission piece mounting groove 311, the top of the rotating rod 510 penetrates through the transmission piece mounting groove 311 on the upper cavity wall of the hydraulic cavity 301, the inner cavity wall of the transmission piece mounting groove 311 on the upper cavity wall of the hydraulic cavity 301 is uniformly embedded with a sealing ring, the top end of the rotating rod 510 is provided with a connecting block 511, one end of the door closer connecting rod 200 is fixedly connected with the connecting block 511, the other end of the door closer connecting rod 200 is;

a rack plunger 600 and a plunger spring 700 are arranged in the inner cavity of the hydraulic cavity 301, and the plunger spring 700 is positioned right to the rack plunger 600;

the rack plunger 600 comprises a rack 610, plungers 620 are fixedly connected to the left end and the right end of the rack 610, the plungers 620 are disc-shaped piston blocks, tapered valve ports 621 are formed in the middle of the plungers 620, and the wide ports of the tapered valve ports 621 of the two sets of plungers 620 are distributed towards the left end port and the right end port of the hydraulic cavity 301. The narrow mouth inner wall fixed mounting of toper valve port 621 has valve frame 001, and the mid-mounting of valve frame 001 has valve ball 002, and the middle part of valve frame 001 is the ring support body, and the circumference lateral wall of ring support body evenly is provided with the support that is radial array, and the outer endwall fixed connection of support is on toper valve port 621's narrow mouth inner wall. The valve ball 002 is a rubber ball plug, the valve ball 002 is located in the inner cavity of the conical valve port 621, a straight rod is fixedly connected to the spherical surface of the valve ball 002, and the straight rod is inserted into the annular cavity of the annular frame body in the middle of the valve frame 001.

The front end of the plunger 620 is provided with a communication port 622, the rear wall of the communication port 622 is uniformly provided with a communication port spring cavity 623, and a piston assembly 630 is arranged in front of the rack 610. The cavity of the communication port 622 penetrates through the front end wall of the plunger 620 and the left and right side walls of the front end wall, the piston assembly 630 comprises a piston strip 631, and the left and right ends of the piston strip 631 are respectively inserted into the communication ports 622 of the two groups of plungers 620. The rear walls at the left end and the right end of the piston strip 631 are uniformly connected with inserted rods 632, the inserted rods 632 and the communicating port spring cavities 623 are coaxially arranged, the rear end portions of the inserted rods 632 are inserted into the hole cavities of the communicating port spring cavities 623, the rod bodies of the inserted rods 632 are sleeved with piston strip springs 633, and the piston strip springs 633 are arranged in the hole cavities of the communicating port spring cavities 623.

The inner cavity of the air pressure cavity 302 can be filled with non-combustible inert gas (such as nitrogen) through the charging connector 01, and the inner cavity of the air pressure cavity 302 is provided with a push bar assembly 800; the push bar assembly 800 comprises a stress plate 810, a push bar 820 is arranged right behind the stress plate 810, front walls at the left end and the right end of the push bar 820 are connected with a connecting column 830, the front end of the connecting column 830 is connected with the rear wall of the stress plate 810, and a rod body of the connecting column 830 is sleeved with a connecting column spring 840 and a corrugated pipe 003.

The stress plate 810 and the pushing strip 820 are uniformly in a plate shape, the rod body of the connecting column 830 is fixedly sleeved with the abutting block 831, the connecting column spring 840 is arranged on one side of the abutting block 831, the connecting column spring 840 is positioned in the inner cavity of the spring cavity 304, the corrugated pipe 003 is arranged on the other side of the abutting block 831, one end of the corrugated pipe 003 is fixedly connected onto the plate surface of the stress plate 810, the other end of the corrugated pipe 003 is fixedly connected onto the rear cavity wall of the inner cavity of the air pressure cavity 302, the stress plate 810 is positioned in the inner cavity of the air pressure cavity 302, the stress plate 810 is close to the rear cavity wall of the air pressure cavity 302, the pushing strip 820 is positioned in the groove cavity of the pushing strip caulking groove 305, and the connecting column 830 penetrates through the piston hole.

When the door is opened, the door body drives the door closer connecting rod 200 to act, so that the transmission piece 500 rotates around the axis of the rotating rod 510, namely the gear 520 rotates, and the rack plunger 600 is driven to move to the right through the meshing transmission relationship between the gear 520 and the rack 610. During the rightward movement of the rack plunger 600, the plunger spring 700 is compressed, and the hydraulic oil in the right chamber of the hydraulic chamber 301 is also compressed. The valve ball 002 in the conical valve hole 621 of the left plunger 620 is opened under the action of oil pressure, and the hydraulic oil in the right cavity of the hydraulic cavity 301 flows into the left cavity through the conical valve hole 621.

After the door opening process is completed, the plunger spring 700 is compressed during the opening process, the accumulated elastic potential energy is released, the rack plunger 600 is pushed to the left, and then the transmission member 500 rotates through the meshing transmission relationship of the gear 520 and the rack 610, and drives the door closer connecting rod 200 to perform the reset motion, so that the door is closed. In the releasing process of the plunger spring 700, as the hydraulic oil in the left chamber of the hydraulic chamber 301 is compressed, the valve ball 002 in the conical valve port 621 of the plunger 620 on the left side is closed under the action of the oil pressure, the hydraulic oil can only flow out through the gap between the chamber wall of the hydraulic chamber 301 and the plunger 620, and the hydraulic oil channel provided with the regulating valve flows back to the right chamber of the hydraulic chamber 301. Therefore, the hydraulic oil forms resistance to the release of the plunger spring 700, namely, the buffering effect is achieved through throttling, and the door body is automatically and slowly closed.

When a fire breaks out, the temperature of the fire scene rises rapidly, so that the inert gas in the gas pressure cavity 302 expands, even if the pressure in the pneumatic chamber 302 increases, the stress plate 810 adjacent to the rear chamber wall of the pneumatic chamber 302 is closed when the inert gas in the pneumatic chamber 302 expands to increase the pressure of the rear chamber wall of the pneumatic chamber 302, so that the pushing strip 820 draws the piston strip 631 towards the central axis of the hydraulic cavity 301, the outer side wall of the piston strip 631 is no longer in contact with the cavity wall of the hydraulic cavity 301, make the hydraulic oil in the hydraulic pressure chamber 301 can circulate between the lateral wall of lateral wall and hydraulic pressure chamber 301 of piston strip 631, increased the passageway of hydraulic oil circulation in other words, be favorable to accelerating the flow efficiency of hydraulic oil in the hydraulic pressure chamber when opening and shutting the door, the resistance of hydraulic oil when both reducing the switch door has reduced the required power when opening the door, has accelerated the speed of automatic door closing again, is favorable to reducing the condition that the flare is spread along the air that flows scurrying and takes place.

After the piston strip 631 is squeezed by the push strip 820, the two ends of the piston strip 631 contract towards the rear inner cavity of the communication port 622 and compress the piston strip spring 633, so that the outer side wall of the piston strip 631 is not in contact with the cavity wall of the hydraulic cavity 301.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically coupled, may be directly coupled, or may be indirectly coupled through an intermediary. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations. In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.