Door closer of fireproof door

Abstract

The utility model discloses a door closer of a fireproof door, which comprises a shell, a door closer and a door closing device, a gear; the first rack and the second rack are respectively meshed with the gear; the sliding sleeve can horizontally and movably sleeve one end, deviating from the gear, of the second rack; a first stay bar; a second stay bar; moreover, a reset assembly used for promoting the first rack and the second rack to reset is further arranged in the containing cavity, a locking component used for limiting the maximum moving stroke of the sliding sleeve is further formed on the side wall of the second rack, and an unlocking component used for releasing the locking state of the sliding sleeve is further arranged on the inner wall of the containing cavity. A detachable plug pin is further arranged between the shell and the gear, and a reset component used for promoting the sliding sleeve to reset is further arranged between the second rack and the sliding sleeve. According to the technical scheme, the main door and the auxiliary door of the fireproof door can be closed in sequence under the linkage action of all the components, the problem that the main door is possibly closed before the auxiliary door is solved, and the overall structure is simple and stable and easy to achieve.

Description

Technical Field

[0001] The utility model relates to the technical field of fire door components, in particular to a fire door closer. Background Art

[0002] Fire doors are usually of a double-leaf structure and are divided into a main door and a sub-door. For the sake of airtightness, a shielding strip is usually provided on the side of the main door facing the sub-door, which makes it necessary to consider the sequence of closing the sub-door first and then the main door during the closing process of the fire door.

[0003] Referring to the Chinese patent "A Two-way Glass Fire Door" with the application number 202310377406.0, it includes a door frame. Two door panels are detachably installed in the door frame. A rotating shaft is fixedly provided on each door panel. Two bottom grooves are fixedly provided on one side of the door frame. The two rotating shafts are respectively slidably arranged in the two bottom grooves, and the bottom grooves can rotate relative to the rotating shafts; on the side of the door frame away from the door frame, there is a control space. A sequencer is rotatably provided in the control space. During the opening and closing process of the door panel, it rotates and moves at the same time to meet the requirement of sealing and smoke isolation. By the movement of the door panel, the sequencer is rotated. In this invention, no matter which direction the door panel is opened, it will drive the sequencer to make corresponding actions, and guide the door panel to close correctly during the closing process of the door panel.

[0004] This patent achieves the purpose of sequential closing of the main door and the sub-door through a moving control sequencer, but its structural design has room for optimization. Content of the Utility Model

[0005] Aiming at the above problems existing in the prior art, a fire door closer is provided at present, which can prompt the main door and the sub-door of the fire door to close in sequence under the linkage of each component, solve the problem that the main door may close before the sub-door, and is used to overcome at least one of the above technical defects.

[0006] The specific technical solution is as follows:

[0007] A fire door closer is installed on the lintel of the fire door frame. The main door and the sub-door of the fire door are respectively hinged to the door frame on the sides facing away from each other. The side of the main door facing the sub-door has a shielding strip; the fire door closer includes:

[0008] A housing, installed on the lintel and having an accommodation cavity formed inside;

[0009] A gear, longitudinally arranged in the accommodation cavity and capable of rotating around its own axis,

[0010] A first rack and a second rack, respectively horizontally slidably installed in the accommodation cavity and arranged facing each other. The two racks are respectively engaged with the gear to cause the two racks to slide in opposite or away directions when the gear rotates;

[0011] The sliding sleeve is horizontally movable and sleeved on one end of the second rack away from the gear;

[0012] The first strut, one end of which is hinged to one end of the first rack away from the gear and the other end is hinged to the inner wall of the secondary door on the inward side;

[0013] The second strut, one end of which is hinged to one end of the sliding sleeve away from the second rack and the other end is hinged to the inner wall of the main door on the inward side;

[0014] Moreover, a reset component for urging the first rack and the second rack to reset is further provided in the accommodation cavity, a locking member for restricting the maximum stroke of the movement of the sliding sleeve is formed on the side wall of the second rack, an unlocking member for releasing the locked state of the sliding sleeve is further provided on the inner wall of the accommodation cavity, a detachable bolt is further provided between the housing and the gear, and a reset member for urging the sliding sleeve to reset is further provided between the second rack and the sliding sleeve.

[0015] When the main door and the secondary door are pushed open to the maximum, the first rack and the second rack move away from each other to the farthest distance, the sliding sleeve moves to the right to the maximum stroke and is restricted by the locking member, and the bolt restricts the rotation of the gear to maintain the open state of the main door and the secondary door;

[0016] When the bolt disengages from the gear, the reset component urges the two racks to move in the initial state direction, and when the second rack resets to the initial position, the unlocking member touches the locking member and releases the locked state of the sliding sleeve. At this time, the secondary door is already in the closed state while the main door is not yet closed, and the sliding sleeve further moves in the initial state direction under the action of the reset member and urges the main door to close.

[0017] Preferably, an installation groove is formed on the side wall of the second rack, the locking member includes a tongue piece assembled in the installation groove and a first spring connecting the tail of the tongue piece and the inner bottom surface of the installation groove, and at least one card slot matching the shape of the head of the tongue piece is formed on the inner wall of the sliding sleeve, so that during the movement of the sliding sleeve relative to the second rack, the head of the tongue piece is snapped into the card slot under the action of the first spring to cause the sliding sleeve and the second rack to be clamped and locked.

[0018] Preferably, one side of the sliding sleeve has an opening groove extending along the length direction, the unlocking member is a ball pin structure disposed on the inner wall of the housing, the ball pin structure includes a ball head passing through the opening groove and abutting against the outer side wall of the second rack and a second spring connecting the ball head and the inner wall of the housing, and during the horizontal movement of the second rack, when the ball head abuts against the tongue piece, it can cause the tongue piece to retract and release the locked state of the sliding sleeve.

[0019] Preferably, sliding grooves extending in the left - right direction are respectively formed on the inner side walls of the accommodation cavity in the front - rear direction, and the first rack and the second rack are respectively installed in the sliding grooves in a limited way and can horizontally move along the sliding grooves.

[0020] Preferably, a T-slot connection structure or a dovetail groove connection structure is formed between the first rack and the second rack and the slide groove, respectively, to allow the first rack and the second rack to slide along the slide groove while limiting the first rack and the second rack from falling out of the slide groove.

[0021] Preferably, the reset component is a coil spring wound around the outer periphery or inner hollow portion of the gear, which is used to generate a preload force after the main door and the auxiliary door are opened, and during the door closing process, the preload force causes the gear to drive the first rack and the second rack to reset.

[0022] Preferably, the reset assembly includes a first tension spring connected between an end of the first rack away from the gear and the corresponding slide groove, and a second tension spring connected between an end of the second rack away from the sliding sleeve and the corresponding slide groove.

[0023] Preferably, the reset member is a third tension spring connected between an end of the second rack adjacent to the sliding sleeve and the sliding sleeve.

[0024] Preferably, the first rack and the second rack are staggered.

[0025] Preferably, a locking hole is provided on the lower end surface of the gear, and the lower end surface of the housing has a pin hole opposite to the locking hole, for allowing a pin to pass through the pin hole and be inserted into the locking hole, thereby locking the gear.

[0026] The beneficial effects of the above technical solution are:

[0027] The fire door closer includes a housing, a gear, a first rack, a second rack, a first strut, a second strut, a reset assembly, a locking component, an unlocking component, and a reset component. Under the linkage of various components, the main door and the auxiliary door of the fire door can be closed in sequence, solving the problem that the main door may close before the auxiliary door. The overall structure is simple, stable, and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a three-dimensional diagram of the fire door closer of the utility model;

[0029] Figure 2 A three-dimensional diagram of the fire door closer of the present invention from another perspective;

[0030] Figure 3 This is a rear view of the fire door closer of the utility model;

[0031] Figure 4 for Figure 3 Cross-sectional view from the medium AA perspective;

[0032] Figure 5 This is a three-dimensional diagram of the fire door closer of the utility model with the outer shell removed;

[0033] Figure 6This is a perspective view of another angle of the fire door closer of the present utility model after removing the outer shell;

[0034] Figure 7 It is Figure 6 a partial enlarged view of part I in;

[0035] Figure 8 This is a cross-sectional view of the fire door closer of the present utility model;

[0036] Figure 9 This is a schematic diagram of the specific application of the fire door closer of the present utility model. Specific embodiments

[0037] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the following embodiments will specifically describe the present utility model in conjunction with the accompanying drawings. And it is defined that Figure 3 the direction perpendicular to the paper surface and inward as shown in the paper surface is the direction from the back to the front in this embodiment, the direction from top to bottom shown in the paper surface is the direction from top to bottom in this embodiment, and the left and right directions shown in the paper surface are the left and right directions in this embodiment. Then Figure 9 the direction from top to bottom shown in the paper surface is the direction from the back to the front in this embodiment, Figure 9 the direction perpendicular to the paper surface and inward is the direction from top to bottom in this embodiment.

[0038] Referring to Figures 1 to 9 as shown in, the fire door closer provided in this embodiment is installed on the lintel of the fire door frame, and the main door 9 and the sub-door 8 of the fire door are respectively hinged to the door frame on the side facing away from each other. The side of the main door 9 facing the sub-door 8 has a shielding strip 91; among them, the fire door closer includes:

[0039] The outer shell 1 is installed on the lintel and has an accommodation cavity 10 formed inside;

[0040] The gear 2 is longitudinally arranged in the accommodation cavity 10 and can rotate around its own axis,

[0041] The first rack 3 and the second rack 4 are respectively installed in the accommodation cavity 10 so as to be horizontally slidable and are arranged facing each other. The two racks are respectively engaged with the gear 2 to cause the two racks to slide in the direction of facing each other or away from each other when the gear 2 rotates;

[0042] The sliding sleeve 5 is horizontally movably sleeved on one end of the second rack 4 away from the gear 2;

[0043] The first strut 6 has one end hinged to one end of the first rack 3 away from the gear 2 and the other end hinged to the inner wall of the sub-door 8;

[0044] The second strut 7 has one end hinged to one end of the sliding sleeve 5 away from the second rack 4 and the other end hinged to the inner wall of the main door 9;

[0045] Moreover, a reset component for urging the first rack 3 and the second rack 4 to reset is provided in the accommodation cavity 10. A locking member 42 for limiting the maximum stroke of the sliding sleeve 5 moving in the right direction is formed on the side wall of the second rack 4. An unlocking member 12 for releasing the locked state of the sliding sleeve 5 is provided on the inner wall of the accommodation cavity 10. A detachable bolt is provided between the outer shell 1 and the gear 2. A reset member for urging the sliding sleeve 5 to reset is provided between the second rack 4 and the sliding sleeve 5.

[0046] When the main door 9 and the sub-door 8 are pushed open to the maximum, the first rack 3 and the second rack 4 move away from each other to the farthest distance. The sliding sleeve 5 moves to the maximum stroke to the right and is limited by the locking member 42. The bolt limits the rotation of the gear 2 to maintain the open state of the main door 9 and the sub-door 8.

[0047] When the bolt disengages from the gear 2, the reset component urges the two racks to move in the initial state direction. When the second rack 4 resets to the initial position, the unlocking member 12 touches the locking member 42 and releases the locked state of the sliding sleeve 5. At this time, the sub-door 8 is already in the closed state while the main door 9 is not yet closed. The sliding sleeve 5 further moves in the initial state direction under the action of the reset member and urges the main door 9 to close.

[0048] Based on the above technical solution, the fire door closer includes an outer shell 1, a gear 2, a first rack 3, a second rack 4, a first strut 6, a second strut 7, a reset component, a locking member 42, an unlocking member 12, and a reset member, which can urge the main door 9 and the sub-door 8 of the fire door to close in sequence under the linkage action of each component, solve the problem that the main door 9 may close before the sub-door 8, and the overall structure is simple and stable, and is easy to implement.

[0049] In a preferred embodiment, as shown in combination with Figures 6 to 8 , a mounting groove is formed on the side wall of the second rack 4. The locking member 42 includes a tongue piece assembled in the mounting groove and a first spring connecting the tail of the tongue piece to the inner bottom surface of the mounting groove. At least one card slot matching the shape of the head of the tongue piece is provided on the inner wall of the sliding sleeve 5. During the movement of the sliding sleeve 5 relative to the second rack 4, the head of the tongue piece is snapped into the card slot under the action of the first spring to cause the sliding sleeve 5 and the second rack 4 to be clamped and locked. Specifically, specifically as Figure 7As shown in FIG, flanges 43 are formed on both ends of the tongue, and the flanges 43 match the shape and position of the slot. Furthermore, one side of the sliding sleeve 5 has an open slot 51 extending along its length. The unlocking member 12 is a ball-pin structure disposed on the inner wall of the housing 1. The ball-pin structure includes a ball head that passes through the open slot 51 and abuts against the outer wall of the second rack 4, and a second spring connected between the ball head and the inner wall of the housing 1. When the second rack 4 moves horizontally, the ball head abuts the tongue, causing the tongue to retract, thereby releasing the locking state of the sliding sleeve 5.

[0050] As a further preferred embodiment, the housing 1 further comprises a slide groove 11 extending in the left-right direction on the inner sidewalls of the accommodating cavity 10 in the front-to-back direction. The first rack 3 and the second rack 4 are respectively positioned and mounted in the slide grooves 11 and are capable of horizontal movement along the slide grooves 11. Furthermore, a T-slot connection structure or a dovetail groove connection structure is formed between the first rack 3 and the second rack 4 and the slide grooves 11, respectively, to allow the first rack 3 and the second rack 4 to slide along the slide grooves 11 while preventing the first rack 3 and the second rack 4 from falling out of the slide grooves 11.

[0051] In a preferred embodiment, the reset component is a coil spring wound around the outer periphery or inner hollow part of the gear 2, which is used to generate a pre-tightening force after the main door 9 and the auxiliary door 8 are opened, and during the door closing process, the pre-tightening force causes the gear 2 to drive the first rack 3 and the second rack 4 to reset.

[0052] In a preferred embodiment, the reset assembly includes a first tension spring 31 connected between the end of the first rack 3 facing away from the gear 2 and the corresponding slide groove 11, and a second tension spring 41 connected between the end of the second rack 4 facing away from the sliding sleeve 5 and the corresponding slide groove 11. Furthermore, the reset member is a third tension spring connected between the end of the second rack 4 adjacent to the sliding sleeve 5 and the sliding sleeve 5.

[0053] As a further preferred embodiment, bearings 22 are respectively provided at both ends of the gear 2, and a circular groove for installing the bearings 22 is provided in the accommodating cavity 10, which can ensure that the gear 2 does not deviate. Furthermore, the first rack 3 and the second rack 4 are staggered so that the two struts and the two racks are staggered by a certain position so as not to interfere with each other. Furthermore, the rear end face of the housing 1 is provided with two strip grooves 14 for allowing the first strut 6 and the second strut 7 to pass through. Furthermore, a locking hole 21 is provided on the lower end face of the gear 2, and a pin hole 13 is provided on the lower end face of the housing 1 opposite to the locking hole 21 to allow the pin to pass through the pin hole 13 and insert into the locking hole 21, thereby causing the gear 2 to be locked.

[0054] In addition, the tooth structure on the outer periphery of the gear 2 is omitted in the figure. However, obviously, the tooth structure is consistent with the tooth pitch of the two racks to ensure the meshing purpose. And the hinge structures between the two struts and the first rack 3, the sliding sleeve 5, the main door 9, and the sub-door 8 are preferably spherical hinge structures that can rotate in all directions, but can also be hooked hinge structures, not limited to this. Moreover, at least two of the front, rear, left, right, upper, and lower side plates of the housing are detachable for disassembling and assembling the device.

[0055] In specific applications, during the process of fully pushing open the door, the two racks move in opposite directions, and the reset component generates a pre-tightening force (the coil spring is unfolded to generate a pre-tightening force, and the tension spring is stretched to generate a pre-tightening force). The sliding sleeve 5 moves away from the second rack 4 until the tongue piece snaps into the card slot, and can be locked by inserting a bolt into the pin hole 13 and the locking hole 21, so as to keep the main door 9 and the sub-door 8 in a fully open state. When it is necessary to close the door, at least pull out the bolt from the locking hole 21. At this time, under the action of the pre-tightening force, the two racks slide in the sliding groove 11 in the reset direction, and after moving a certain distance (preferably the position where the second rack 4 is about to be reset), the ball pin structure touches the tongue piece and pushes the tongue piece inward to release the locking state of the sliding sleeve 5. At this time, the sub-door 8 is almost closed, and the main door 9 still has an opening and closing degree of about 5 to 10 degrees. The sliding sleeve 5 further performs a reset action under the action of the third tension spring, and brings the main door 9 back to its position through the sliding sleeve 5 and the second strut 7.

[0056] The above is only the preferred embodiment of the present invention, which is illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims

1. A fire door closer, mounted on the lintel of a fire door frame, wherein the main door (9) and the auxiliary door (8) of the fire door are respectively hinged on the door frame on opposite sides thereof, and the main door (9) has a shielding strip (91) on the side facing the auxiliary door (8); characterized in that: The fire door closer comprises: A housing (1) is mounted on the door lintel and has a receiving cavity (10) formed therein; A gear (2) is longitudinally arranged in the accommodating cavity (10) and is capable of rotating around its own axis; The first rack (3) and the second rack (4) are respectively installed in the accommodating cavity (10) in a horizontally slidable manner and arranged facing each other. The two racks are respectively engaged with the gear (2) to cause the two racks to slide in directions toward or away from each other when the gear (2) rotates; A sliding sleeve (5) is horizontally movable and sleeved on an end of the second rack (4) facing away from the gear (2); A first support rod (6), one end of which is hinged to the end of the first rack (3) facing away from the gear (2) and the other end of which is hinged to the wall on the inner side of the auxiliary door (8); A second support rod (7), one end of which is hinged to the end of the sliding sleeve (5) facing away from the second rack (4) and the other end of which is hinged to the wall on the inner side of the main door (9); In addition, a reset component is provided in the accommodating chamber (10) for urging the first rack (3) and the second rack (4) to reset; a locking component (42) is provided on the side wall of the second rack (4) for limiting the maximum travel of the sliding sleeve (5); an unlocking component (12) is provided on the inner wall of the accommodating chamber (10) for releasing the locked state of the sliding sleeve (5); a detachable latch is provided between the housing (1) and the gear (2); and a reset component is provided between the second rack (4) and the sliding sleeve (5) for urging the sliding sleeve (5) to reset.

2. The fire door closer according to claim 1, wherein: A mounting groove is provided on the side wall of the second rack (4), and the locking member (42) includes a tongue piece assembled in the mounting groove, a first spring connected to the tail of the tongue piece and the bottom surface of the mounting groove, and the inner wall of the sliding sleeve (5) has at least one slot matching the shape of the head of the tongue piece, so that when the sliding sleeve (5) moves relative to the second rack (4), the head of the tongue piece is engaged in the slot under the action of the first spring to cause the sliding sleeve (5) and the second rack (4) to be locked.

3. The fire door closer according to claim 2, wherein: One side of the sliding sleeve (5) has an open groove (51) extending in the longitudinal direction. The unlocking member (12) is a ball pin structure arranged on the inner wall of the shell (1). The ball pin structure includes a ball head passing through the open groove (51) and contacting the outer wall of the second rack (4), and a second spring connected between the ball head and the inner wall of the shell (1). When the second rack (4) moves horizontally, the ball head contacts the tongue piece and can cause the tongue piece to retract, thereby releasing the locking state of the sliding sleeve (5).

4. The fire door closer according to claim 3, wherein: The inner side walls of the accommodating cavity (10) in the front-to-back direction are respectively formed with sliding grooves (11) extending in the left-to-right direction. The first rack (3) and the second rack (4) are respectively limitedly installed in the sliding grooves (11) and can move horizontally along the sliding grooves (11).

5. The fire door closer according to claim 4, wherein: A T-slot connection structure or a dovetail groove connection structure is respectively formed between the first rack (3) and the second rack (4) and the slide groove (11), so as to allow the first rack (3) and the second rack (4) to slide along the slide groove (11) while limiting the first rack (3) and the second rack (4) from falling out of the slide groove (11).

6. The fire door closer according to claim 1, wherein: The reset assembly is a coil spring wound around the outer periphery or inner hollow portion of the gear (2), which is used to generate a preload force after the main door (9) and the auxiliary door (8) are opened, and during the door closing process, the preload force causes the gear (2) to drive the first rack (3) and the second rack (4) to reset.

7. The fire door closer according to claim 4, wherein: The reset assembly comprises a first tension spring (31) connected between an end of the first rack (3) facing away from the gear (2) and the corresponding slide groove (11), and a second tension spring (41) connected between an end of the second rack (4) facing away from the sliding sleeve (5) and the corresponding slide groove (11).

8. The fire door closer according to claim 6 or 7, characterized in that: The reset component is a third tension spring connected between one end of the second rack (4) adjacent to the sliding sleeve (5) and the sliding sleeve (5).

9. The fire door closer according to claim 1, wherein: The first rack (3) and the second rack (4) are arranged in a staggered manner.

10. The fire door closer according to claim 9, wherein: A locking hole (21) is provided on the lower end surface of the gear (2), and a pin hole (13) is provided on the lower end surface of the housing (1) opposite to the locking hole (21) to allow the latch pin to pass through the pin hole (13) and be inserted into the locking hole (21), thereby causing the gear (2) to be locked.

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