Adjustable door closer for fire door

Abstract

The utility model discloses an adjustable door closer of fireproof door, including the door closer cylinder, the door closer cylinder in setting up spring and piston, the piston in setting up the gear for controlling swing of swing arm, the rack is set to the opposite gear of piston inboard, and the inner wall of door closer cylinder is provided with main flow channel and auxiliary flow channel, the inner wall of door closer cylinder is provided with first confluence area and second confluence area, and first confluence area is opposite the oil storage area setting, and one end of main flow channel and auxiliary flow channel is respectively connected with first confluence area, first on-off mechanism is set up in first confluence area, and the utility model discloses divide into main flow channel and auxiliary flow channel, and auxiliary flow channel can optional use, when selecting simultaneously open main flow channel and auxiliary flow channel, can increase the speed of hydraulic oil from oil storage area backflow to backflow area, and then reduce the resistance in the process of door leaf closing, adjust door leaf closing intensity.

Description

Technical Field

[0001] This utility model relates to a door closer, specifically an adjustable door closer for fire doors, and belongs to the technical field of fire door hardware accessories. Background Technology

[0002] Existing fire door closers typically use a spring in conjunction with hydraulic oil. During the closing process, this creates a relatively gentle resistance, resulting in a smooth door movement. When the door opens, the door rocker arm drives a gear, which in turn moves a piston within a cylinder. This compresses the spring, and simultaneously, the hydraulic oil in the return oil zone flows through a one-way valve in the piston to an oil storage zone on the other side. When the external force is removed, the spring pushes the piston in the opposite direction, compressing the space in the oil storage zone. To slow the return flow of the hydraulic oil, it cannot return directly to the return zone from the one-way valve and piston; instead, it must return through a dedicated flow path. However, existing door closers typically have fixed resistance strength, or can only be adjusted by turning a screw to regulate the opening and closing of the valve body inside the flow channel, achieving only a small degree of adjustment. The effect during door closing is not significant. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose an adjustable fire door that is convenient and flexible to use, has a large adjustment range, a simple and reasonable structure, and is stable and durable.

[0004] An adjustable door closer for a fire door includes a door closer cylinder, within which a first spring and a piston are disposed; a gear for controlling the swing of a rocker arm is disposed within the piston; a rack is disposed on the inner side of the piston opposite the gear; a main flow channel and an auxiliary flow channel are disposed within the inner wall of the door closer cylinder; a first confluence zone and a second confluence zone are disposed within the inner wall of the door closer cylinder; the first confluence zone is disposed opposite to an oil storage zone; one end of the main flow channel and the auxiliary flow channel are respectively connected to the first confluence zone; a first on / off mechanism is disposed within the first confluence zone; the second confluence zone is disposed opposite to a return flow zone; the other end of the main flow channel and the auxiliary flow channel are respectively connected to the second confluence zone; and a second opening / closing mechanism is disposed within the second confluence zone.

[0005] Furthermore, the first confluence area has a first liquid outlet relative to the main flow channel; a second liquid outlet is provided relative to the auxiliary flow channel; the first on / off mechanism includes a locking block slidably disposed within the first confluence area; the second liquid outlet is trapezoidal; and the locking block is provided with a trapezoidal plug relative to the second liquid outlet.

[0006] Furthermore, the locking block includes a strip-shaped through hole; the first liquid outlet is always within the length range of the strip-shaped through hole; an insertion cavity is provided on an adjacent side of the strip-shaped through hole; the inner wall of one side of the insertion cavity is inclined; the first on / off mechanism also includes a first spiral column; the upper end of the first spiral column is on the surface of the door closer cylinder, and the lower end is in the insertion cavity; the lower end of the first spiral column is in contact with or separates from the inclined inner wall; one side of the locking block is connected to the inner wall of the first confluence area through a second spring.

[0007] Furthermore, a third liquid outlet is provided at the bottom of the second confluence zone opposite to the return zone; the third liquid outlet is trapezoidal; a one-way valve is provided inside the third liquid outlet; the second opening and closing mechanism includes a valve head provided in the second confluence zone; the valve head has the same inner contour as the third liquid outlet.

[0008] Furthermore, the valve head has several flow channels running through it; a second helical column is connected to the valve head; the second helical column is rotatably connected to the valve head.

[0009] This invention offers the following advantages: it divides the flow into a main channel and an auxiliary channel, with the auxiliary channel being selectively usable. When both the main channel and auxiliary channel are opened simultaneously, the speed at which hydraulic oil flows back from the storage area to the return area increases, thereby reducing resistance during door closing and adjusting the closing force. To open the auxiliary channel, simply rotate the first helical column to control the movement of the first opening and closing mechanism, connecting the auxiliary channel to the first confluence area; then rotate the second helical column to control the movement of the second closing mechanism, connecting the auxiliary channel to the second confluence area. Ultimately, the storage area and the return area are connected by the main channel and auxiliary channel, expanding the flow space. The operation is simple, and the amplitude control is precise. Attached Figure Description

[0010] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0011] Figure 2 This is a schematic diagram of the internal structure of the first confluence zone in this utility model.

[0012] Figure 3 This is a structural diagram of another state of the first confluence zone.

[0013] Figure 4 This is a schematic diagram of the internal structure of the reflux zone in this utility model.

[0014] The arrows in the diagram indicate the direction of oil flow from the oil storage area to the main flow channel or auxiliary flow channel.

[0015] Wherein: 1 is the door closer cylinder, 2 is the first spring, 3 is the piston, 4 is the gear, 5 is the main flow channel, 6 is the auxiliary flow channel, 7 is the first confluence area, 7-1 is the first liquid outlet, 7-2 is the second liquid outlet, 8 is the second confluence area, 9 is the oil storage area, 10 is the locking block, 10-1 is the strip-shaped through hole, 10-2 is the insertion cavity, 11 is the first spiral column, 12 is the third liquid outlet, 13 is the one-way valve, 14 is the valve head, 14-1 is the flow channel, 15 is the second spiral column, 16 is the reflux area, and 17 is the second spring. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] See Figures 1-4 This application discloses an adjustable door closer for a fire door, comprising a door closer cylinder 1, a first spring 2 and a piston 3 disposed inside the door closer cylinder 1; a gear 4 for controlling the swing of a rocker arm disposed inside the piston 3; a rack 4 disposed on the inner side of the piston 3 opposite to the gear; a main flow channel 5 and an auxiliary flow channel 6 disposed inside the inner wall of the door closer cylinder 1; a first confluence zone 7 and a second confluence zone 8 disposed inside the inner wall of the door closer cylinder 1; the first confluence zone 7 is disposed opposite to an oil storage zone 9; one end of the main flow channel 5 and the auxiliary flow channel 6 are respectively connected to the first confluence zone 7; a first on / off mechanism is disposed inside the first confluence zone 7; the second confluence zone 8 is disposed opposite to a return flow zone 16; the other end of the main flow channel 5 and the auxiliary flow channel 6 are respectively connected to the second confluence zone 8; a second opening / closing mechanism is disposed inside the second confluence zone 8.

[0018] Furthermore, the first confluence zone 7 has a first outlet 7-1 relative to the main flow channel 5; and a second outlet 7-2 relative to the auxiliary flow channel 6; the first on / off mechanism includes a locking block 10 slidably disposed in the first confluence zone 7; the second outlet 7-2 is trapezoidal; and the locking block 10 is provided with a trapezoidal plug relative to the second outlet 7-2.

[0019] Furthermore, the locking block 10 includes a strip-shaped through hole 10-1; the first liquid outlet 7-1 is always within the length range of the strip-shaped through hole 10-1; an insertion cavity 10-2 is provided on the adjacent side of the strip-shaped through hole 10-1; the inner wall of one side of the insertion cavity 10-2 is inclined; the first on / off mechanism also includes a first spiral column 11; the upper end of the first spiral column 11 is on the surface of the door closer cylinder 1, and the lower end is in the insertion cavity 10-2; the lower end of the first spiral column 11 is in contact with or separate from the inclined inner wall; one side of the locking block 10 is connected to the inner wall of the first confluence area 7 through a second spring 17.

[0020] Specifically, in this embodiment, when the auxiliary flow channel 6 needs to be opened to share the backflow task with the main flow channel 5, the first spiral column 11 can be rotated to move downwards. During its descent, it will contact the inclined sidewall of the locking block 10 and push the locking block 10 to move to the left against the force of the second spring. Subsequently, the trapezoidal plug on the right side of the locking block 10 will separate from the second outlet 7-2. At this time, as the hydraulic oil moves upwards from the oil storage area, it can not only pass through the strip-shaped through hole 10-1 into the main flow channel 5, but also enter the auxiliary flow channel 6.

[0021] Furthermore, a third outlet 12 is provided at the bottom of the second confluence zone 8 opposite to the return zone 16; the third outlet 12 is trapezoidal; a one-way valve 13 is provided inside the third outlet 12; the second opening and closing mechanism includes a valve head 14 provided in the second confluence zone 8; the valve head 14 is consistent with the inner contour of the third outlet 12.

[0022] Furthermore, the valve head 14 has several flow channels 14-1 extending through it; a second spiral column 15 is connected to the valve head 14; the second spiral column 15 is rotatably connected to the valve head 14.

[0023] Specifically, in this embodiment, by rotating the second helical column 15, the valve head 14 is moved upward; when the side of the valve head 14 is separated from the auxiliary flow channel 6, the hydraulic oil can enter the second confluence area 8 from the auxiliary flow channel 6, and enter the return flow area from the one-way valve at its bottom.

[0024] It should be noted that when the valve head 14 closes the auxiliary flow channel 6, only the hydraulic oil in the main flow channel 5 can enter the second confluence area 8 and then the return flow area. In this state, because the valve head 14 has a through flow channel 14-1, the flow between the main flow channel 5 and the return flow area can be kept unobstructed.

[0025] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An adjustable door closer for a fire door, comprising a door closer cylinder (1), wherein a first spring (2) and a piston (3) are disposed inside the door closer cylinder (1); wherein a gear (4) for controlling the swing of a rocker arm is disposed inside the piston (3); wherein a rack is disposed on the inner side of the piston (3) opposite to the gear, characterized in that: The inner wall of the door closer cylinder (1) is provided with a main flow channel (5) and an auxiliary flow channel (6); the inner wall of the door closer cylinder (1) is provided with a first confluence zone (7) and a second confluence zone (8); the first confluence zone (7) is arranged opposite to the oil storage zone (9); one end of the main flow channel (5) and the auxiliary flow channel (6) are respectively connected to the first confluence zone (7); a first switching mechanism is provided in the first confluence zone (7); the second confluence zone (8) is arranged opposite to the return flow zone (16); the other end of the main flow channel (5) and the auxiliary flow channel (6) are respectively connected to the second confluence zone (8); a second opening and closing mechanism is provided in the second confluence zone (8).

2. The adjustable door closer for a fire door according to claim 1, characterized in that: The first confluence zone (7) has a first outlet (7-1) relative to the main flow channel (5); and a second outlet (7-2) relative to the auxiliary flow channel (6); the first on / off mechanism includes a locking block (10) slidably disposed in the first confluence zone (7); the second outlet (7-2) is trapezoidal; and the locking block (10) is provided with a trapezoidal plug relative to the second outlet (7-2).

3. The adjustable door closer for a fire door according to claim 2, characterized in that: The locking block (10) includes a strip-shaped through hole (10-1); the first liquid outlet (7-1) is always within the length range of the strip-shaped through hole (10-1); a plug-in cavity (10-2) is provided on the adjacent side of the strip-shaped through hole (10-1); the inner wall of one side of the plug-in cavity (10-2) is inclined; the first on / off mechanism also includes a first spiral column (11); the upper end of the first spiral column (11) is on the surface of the door closer cylinder (1), and the lower end is in the plug-in cavity (10-2); the lower end of the first spiral column (11) is in contact with or separate from the inclined inner wall; one side of the locking block (10) is connected to the inner wall of the first confluence area (7) through a second spring (17).

4. The adjustable door closer for a fire door according to claim 1, characterized in that: The bottom of the second confluence zone (8) is provided with a third outlet (12) opposite to the return zone (16); the third outlet (12) is trapezoidal; a one-way valve (13) is provided in the third outlet (12); the second opening and closing mechanism includes a valve head (14) provided in the second confluence zone (8); the valve head (14) is consistent with the inner contour of the third outlet (12).

5. The adjustable door closer for a fire door according to claim 4, characterized in that: The valve head (14) has several flow channels (14-1) running through it; a second spiral column (15) is connected to the valve head (14); the second spiral column (15) is rotatably connected to the valve head (14).

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