CN211173634U - Door closer for keeping door normally closed - Google Patents

Abstract

The utility model discloses a door closer for keeping door normal close, including forcing mechanism and the load-bearing mechanism through rotor arm swing joint, the load-bearing mechanism is provided with the guide way, forcing mechanism sets up linkage part and acting part, wherein the linkage part pushes and pulls the acting part, the acting part includes the airtight casing of packing damping medium, the piston rod is connected with the piston in the casing, and is separated into front cavity and back cavity by the piston with the casing inner chamber, the piston rod sets up in the back cavity; the front end surface of the piston is provided with a discharge passage communicated to the rear cavity, two ends of the piston are communicated with a return passage, the piston is movably connected with a flow blocking ring, the flow blocking ring slides along the piston, and the front cavity is provided with an elastic pushing part; when the door is opened, the flow blocking ring slides to the blocking position of the discharge passage relative to the piston, and when the door is closed, the flow blocking ring opens the discharge passage. The door closer provides door pushing resistance, so that the door is not easy to open, and the door closer has the advantages of simple structure, convenience in installation and use, compact structure and small size.

Description

Door closer for keeping door normally closed

Technical Field

The present invention relates to a door and window opening and closing assist device, and more particularly to a door closer for keeping a door normally closed.

Background

A door closer is a device designed to assist opening and closing operations of a door and a window. The door closer has the significance of not only automatically closing the door, but also protecting the door frame and the door body (smooth closing), and is used in commercial and public buildings to automatically close the door to limit the spread of fire and ventilation in the building. In addition, the application of door closers in home life is gradually popularized by people.

Chinese utility model publication No. CN102472068A discloses a door and window opening and closing device, in which an arm block of a pull arm rotating from an open state to a closed state is provided in a main body box elongated in one direction, a 1 st slider linearly moving in one direction in association with the rotation of the arm block is provided on one side of the main body box, a 2 nd slider is provided on the opposite side of the 1 st slider, an additional force member for adding force to the 1 st slider in one direction is provided on one side of the main body box, and a damper for blocking the linear movement of the 2 nd slider is provided on the opposite side of the main body box. Just as this utility model discloses, door closer on the market, the majority is by a single arm-drag and set up rather than an additional power part and a buffer of both sides and constitute, such door closer structure is more complicated, the component part is numerous, the equipment is wasted time and energy, and has the problem that whole size is bigger than normal, can only install with the form that exposes door plant or door frame greatly, not only influences pleasing to the eye, also can influence its use sometimes to bring inconvenience. In addition, in real life, a need exists for maintaining a door with a large closing holding force, for example, a fire door in a building can affect the use of fire protection if the door is opened inadvertently and cannot be closed in time.

Accordingly, those skilled in the art have endeavored to develop a door closer for maintaining the door normally closed, which improves the retention of the closing in addition to providing a simpler structure, reducing the manufacturing cost.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of the prior art, the utility model aims to solve the technical problem that a door closer that can keep great door closing holding power is provided, and overcomes present door closer structure complicacy and be difficult to assemble and install, and the shortcoming that uses is influenced on the large side to the whole size.

In order to achieve the above purpose, the utility model provides a door closer for keeping the door normally closed, which comprises a force application mechanism and a bearing mechanism which are matched with each other, wherein the force application mechanism and the bearing mechanism are respectively selected and arranged on one of a door frame and a door body, the force application mechanism and the bearing mechanism are movably connected through a rotating arm, wherein the bearing mechanism is provided with a guide groove for the free end of the rotating arm to enter and slide, the force application mechanism is sequentially provided with a linkage component and an acting component along the length direction, the linkage component is provided with a rotating shaft in transmission connection with the rotating arm and a transmission rod for pushing and pulling the acting component through transmission, the acting component comprises a closed shell, the inner cavity of the shell is filled with damping medium in a fluid state, a piston connected with a piston rod is arranged in the shell and divides the inner cavity of the shell into a front cavity and a rear cavity through the piston, and the piston rod is arranged in the rear cavity, penetrates out of the rear end of the shell and is in transmission connection with the transmission rod; the piston is provided with a front end surface and a rear end surface which respectively correspond to the front cavity and the rear cavity, the front end surface is provided with a plurality of discharge passages communicated to the rear cavity, two ends of the piston are communicated with return passages, the piston is movably connected with a flow blocking ring, the flow blocking ring slides along the piston, and the front cavity is internally provided with an elastic pushing part for pushing the piston; when the door is opened, the flow blocking ring slides to the blocking position of the discharge channel relative to the piston, so that the flow of the damping medium is slowed down, and resistance is formed on the piston. When the piston moves along the length direction of the shell, the damping medium in the front cavity and the damping medium in the rear cavity are promoted to flow relatively through the piston, and the flow resistance is generated under the action of the flow channel, so that the stress of the piston is influenced, and the resistance of the piston is small when the damping medium flows fast.

Furthermore, the diameter of the piston is smaller than the inner diameter of the shell so that a gap is formed between the outer wall of the piston and the inner wall of the shell, the middle part of the piston is radially recessed to form an annular groove, an outlet of the flow discharge channel is arranged on the annular groove, the flow blocking ring is embedded in the annular groove and can slide back and forth, and the outer wall of the flow blocking ring is close to the inner wall of the shell; when the flow blocking ring slides to one side close to the rear end face along the annular groove, the outer annular wall of the flow blocking ring blocks a gap between the rear end face and the shell.

Further, when the flow channel is not closed, the flow rate of the flow leakage channel in unit time is greater than that of the return channel. Thus, when the drain is open, the damping medium flows more easily and provides less resistance to movement of the piston, whereas when the drain is blocked, fluid can only flow through the return, increasing resistance.

Further, the drain passages are provided in plurality and uniformly distributed along the circumferential direction of the piston.

Further, the linkage part comprises a cam in transmission connection with the rotating shaft, the cam is sleeved outside the rotating shaft, and the periphery of the cam is hinged with the transmission rod.

Further, the urging portion includes a compression spring or a gas spring abutting against an end of the piston rod of the damping portion. Compression springs are a common arrangement that cushions and accumulates potential energy as the piston compresses the compression spring, and imparts a thrust to urge movement of the piston as it moves away. The gas spring can provide large and stable thrust, and can provide large resistance when the piston is extruded.

Preferably, the damping medium is hydraulic oil.

Compared with the existing product, the door closer of the utility model adopts a special damping medium flow passage structure, provides the door pushing resistance, makes the door not easy to open, and provides larger power when closing, and can make the door automatically close; the device simple structure, constitution part are few, have reduced the cost of production, and install convenient to use, because compact structure, this door closer has the less advantage of size, installs on door and window or inside door and window, has better outward appearance effect.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is an external schematic view of the door closer of the present invention.

Fig. 2 is a schematic structural diagram of a bearing mechanism of the door closer of the present invention.

Fig. 3 is a schematic configuration diagram of the urging mechanism of the door closer according to embodiment 1.

Fig. 4 is an exploded schematic view of each component of the door closer of embodiment 1.

Fig. 5 is a schematic sectional structure view of the urging mechanism of the door closer according to embodiment 1 when the piston moves rearward.

Fig. 6 is a schematic sectional structure view of the urging mechanism of the door closer according to embodiment 1 when the piston moves forward.

Fig. 7 is a schematic structural view of the door closer of embodiment 2.

In the figure, 100 force application mechanisms, 1 linkage component, 11 rotating shafts, 12 cams, 13 boxes, 14 transmission rods, 15 transmission blocks, 16 connecting rods, 2 acting components, 21 first fixed ends, 22 second fixed ends, 23 shells, 231 sleeves, 232 first sealed ends, 233 second sealed ends, 234 sealing sleeves, 24 shell inner cavities, 241 front cavities, 242 rear cavities, 25 piston rods, 26 pistons, 261 front end surfaces, 262 rear end surfaces, 263 annular grooves, 264 leakage channels, 265 return channels, 27 flow blocking rings, 31 compression springs, 32 gas springs, 200 bearing mechanisms, 201 guide grooves, 202 inlets, 300 rotating arms, 301 rollers and 302 shaft columns.

Detailed Description

Example 1

Fig. 1 shows a door closer of the present embodiment, which includes a force applying mechanism 100 and a carrying mechanism 200, which are mutually matched, and are alternatively installed on one of the door frame and the door body, for example, a user can install the force applying mechanism on the bottom side of the upper door frame, and install the carrying mechanism on the upper side of the door body or the upper side of the door surface of the door body in the pushing direction close to the door frame, and the installation manner includes hidden installation, for example, the above two mechanisms can be installed on the lower sides of the door frame and the door body, or conversely, the force applying mechanism can be installed on the door body, and the carrying mechanism is installed on the door frame. The force application mechanism 100 and the bearing mechanism 200 are movably connected through a rotating arm 300, as shown in fig. 2, the bearing mechanism 200 is provided with a guide groove 201 for the free end of the rotating arm 300 to enter and slide, the guide groove 201 is provided with an inlet 202 for the free end of the rotating arm 300 to enter, and the position of the inlet 202 is matched with the position of the free end of the rotating arm 300, for example, when the bearing mechanism 200 is installed on a door and the force application mechanism 100 is installed on a door frame, the inlet 202 of the guide groove 201 needs to be on an arc track through which the free end of the rotating arm 300 rotates relative to the door. Alternatively, the longitudinal direction of the guide groove 201 is along the direction of the door surface when the support mechanism 200 is mounted on the door, and the longitudinal direction of the guide groove 201 is along the direction of the door surface when the door is closed when the support mechanism is mounted on the door frame.

As shown in fig. 3 and 4, the force applying mechanism 100 includes a linkage component 1 and a working component 2, a first fixing end 21 and a second fixing end 22 are respectively disposed at two ends of the linkage component 1 and the working component 2, and mounting holes fixed on a door or a door frame are disposed on the first fixing end 21 and the second fixing end 22. The first fixed end 21 is fixedly connected with the front end of the closed shell 23 of the acting component 2, the linkage component 1 is installed in the second fixed end 22, the second fixed end 22 penetrates through the rotating shaft 11, the rotating arm 300 and the linkage component 1 are embedded in the rotating shaft 11, and the rotating arm 300 rotates to drive the rotating shaft 11 to rotate. In a preferred embodiment, the shaft 11 has a hexagonal cylindrical shape, and the rotating arm 300 has a hexagonal hole corresponding to the sectional size of the shaft 11. The other end of the rotating arm 300 is a free end and is provided with a roller 301, and the roller 301 is sleeved on a shaft column 302 fixed on the end part of the free end of the rotating arm 300. Under the condition that the linkage part 1 is not forced to rotate, the rotating arm has an initial position, along with the closing action of the door, the force application mechanism 100 makes an arc motion relative to the bearing mechanism 200, the roller 301 at the free end of the rotating arm 300 enters the guide groove 201 and slides along the guide groove 201, and the rotating arm 300 rotates, so that the rotating shaft 11 is driven to rotate, and the linkage part 1 makes a synchronous rotation.

In this embodiment, the linkage component 1 includes a cam 12, the cam 12 is installed in a box 13, the rotating shaft 11 passes through the cam 12, and a pad or a gasket for positioning and installing the rotating shaft 11 is fixedly disposed on both the top surface and the bottom surface of the box 13. The periphery of the cam 12 is provided with a hinge hole for hinging the transmission rod 14. The transmission rod 14 performs push-pull action on the acting component 2 through the rotation transmission of the cam 12.

As shown in fig. 4, the acting component 2 includes a sealed housing 23, the sealed housing 23 is composed of a sleeve 231, a first sealed end 232 and a second sealed end 233, the first sealed end 232 and the second sealed end 233 are sealed at two ends of the sleeve 231, wherein a piston rod 25 is inserted into the second sealed end 233, and the aperture of a hole connecting the second sealed end 233 through which the piston rod 25 passes is set to be equal to the outer diameter of the piston rod 25, so that the two are close to each other to improve the sealing performance. One end of the piston rod 25 is fixedly inserted with a transmission block 15, the transmission block 15 is in transmission connection with the transmission rod 14, a sealing sleeve 234 is further sleeved at the joint of the end of the piston rod 25 and the transmission block 15, and the sealing sleeve 234 is connected with the end of the second sealing end 233. When the transmission rod 14 is driven by the cam 12, the transmission block 15 is pushed and pulled to drive the piston rod 25 connected with the transmission block 15 to move forwards and backwards.

The end of the piston rod 25 extending into the housing 23 is fixedly connected with a piston 26, and the housing inner cavity 24 is divided into a front cavity 241 and a rear cavity 242 by the piston 26. The damping medium in fluid form is filled in the front cavity 241 and the rear cavity 242, in an embodiment of the present invention, the damping medium is hydraulic oil. The piston 26 has a front end surface 261 and a rear end surface 262 corresponding to the front cavity 241 and the rear cavity 242, respectively, and at least one passage leading to the cavity corresponding to the other end surface through one of the end surfaces is opened on the piston 26 to form a flow passage of hydraulic oil, as shown in fig. 5.

In the sectional structure of the door closer forcing mechanism of the embodiment shown in fig. 5, the diameter of the piston 26 is smaller than the inner diameter of the housing 23 so that the outer wall of the piston 26 has a clearance with the inner wall of the housing 23, the middle part of the piston 26 is radially recessed to form an annular groove 263, a flow blocking ring 27 is inserted in the annular groove 263 in a sliding manner in the front-back direction, and the outer wall of the flow blocking ring 27 is close to the inner wall of the housing 23. In one embodiment, four discharge passages 264 are symmetrically formed on the front end surface 261 of the piston 26 to communicate with the annular groove 263, and the inner hole of the baffle ring 27 is sized to communicate with the discharge passages 264, for example, when the discharge passages 264 communicate with the concave wall of the annular groove 263, the inner hole is formed to provide a gap between the baffle ring 27 and the concave wall of the annular groove 263. A return passage 265 further penetrates through the piston 26, and openings at both ends of the return passage 265 are respectively located on both end surfaces of the piston 26; when the piston moves, the baffle ring 27 moves in the annular groove 263 due to the viscous action of the hydraulic oil, and the baffle ring 27 slides along the annular groove 263 to a side close to one of the end surfaces of the piston due to the continuous movement of the piston, the outer annular wall of the baffle ring 27 blocks the gap between the end surface and the housing, thereby blocking the flow of the hydraulic oil in the gap. When the flow channel is not closed, the flow rate of the flow leakage channel per unit time is greater than that of the return channel, and an optional embodiment for achieving the purpose is to set the aperture of the flow leakage channel to be greater than that of the return channel.

A compression spring 31 is provided in the front cavity 241, the compression spring 31 abutting against the piston 26 so as to continuously give an elastic pushing force to the piston rod 25 connected to the piston 26, and giving a buffering force to the piston rod 25 when the piston 26 moves forward in a direction in which the compression spring 31 is compressed; when the piston rod 25 moves in the direction in which the compression spring 31 is returned, the elastic potential energy is released, giving the piston rod 25 a thrust force.

The door closer operating mechanism is exemplified as follows: when the door is closed, the free end of the rotating arm in the force application mechanism moves in an arc line towards the guide groove of the bearing mechanism along the door closing direction and slides into the guide groove, so that the rotating arm rotates to drive the cam to rotate, the transmission rod drives the piston rod to pull the piston backwards (downwards as shown in figure 5), the compression spring in the front cavity pushes the piston to promote the piston to move backwards, meanwhile, the flow blocking ring reaches the front side of the piston forwards in the annular groove, along with the extrusion of the piston on the front cavity, hydraulic oil flows out of the annular groove through the discharge passage and flows to the rear cavity along the oil passing gap between the rear end surface and the inner wall of the shell, at the moment, the flow passage is in a conduction state, the hydraulic oil has a large flow rate, and the flow of the discharge passage is large enough, so that the piston is not subjected to the resistance of the hydraulic oil while being pushed by the compression spring, therefore, the door has an, the positional relationship of the parts of the piston portion at this time is shown in fig. 5; when the door is opened, the rotation direction of the rotating arm is opposite to that of the door when the door is closed, so that the piston rod is pushed to push the piston forwards, the compression spring is compressed, the flow blocking ring oppositely and backwards reaches the rear side of the piston in the annular groove, an oil passing gap between the rear end surface of the piston and the inner wall of the shell is sealed, hydraulic oil in the flow discharge channel cannot flow to the rear cavity, the hydraulic oil in the front cavity can only slowly enter the rear cavity through the return channel under the extrusion of the piston towards the front cavity, so that hydraulic resistance is formed, the piston is subjected to larger resistance under the dual functions of the resistance of the compression spring, so that larger door opening resistance is formed, and the position relation of parts of the piston part is shown in figure 6 at. When the door-pushing force is sufficient to overcome this resistance, the door will still be opened.

Example 2

The door closer of the present embodiment has substantially the same structure as that of embodiment 1, as shown in fig. 7, except that the compression spring is replaced with a gas spring 32. The gas spring can provide larger elastic thrust relative to the compression spring, and has better maintaining effect than the compression spring when larger closing holding force is needed.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (7)

1. A door closer for keeping a door normally closed comprises a force application mechanism and a bearing mechanism which are matched with each other, wherein one of the force application mechanism and the bearing mechanism is installed on a door frame and a door body, and the force application mechanism and the bearing mechanism are movably connected through a rotating arm; the piston is provided with a front end surface and a rear end surface which respectively correspond to the front cavity and the rear cavity, the front end surface is provided with a plurality of discharge passages communicated to the rear cavity, two ends of the piston are communicated with return passages, the piston is movably connected with a flow blocking ring, the flow blocking ring slides along the piston, and the front cavity is internally provided with an elastic pushing part for pushing the piston; when the door is opened, the flow blocking ring slides to the blocking position of the discharge channel relative to the piston, so that the flow of the damping medium is slowed down, and resistance is formed on the piston.

2. The door closer of claim 1, wherein the diameter of the piston is smaller than the inner diameter of the housing so that a gap is formed between the outer wall of the piston and the inner wall of the housing, the middle part of the piston is radially recessed to form an annular groove, the outlet of the bleed passage is opened on the annular groove, the flow blocking ring is embedded in the annular groove and can slide back and forth, and the outer wall of the flow blocking ring is close to the inner wall of the housing; when the flow blocking ring slides to one side close to the rear end face along the annular groove, the outer annular wall of the flow blocking ring blocks a gap between the rear end face and the shell.

3. A door closer according to claim 1, wherein the flow rate of the bleed duct per unit time is greater than the flow rate of the return duct when the flow duct is not closed.

4. A door closer according to claim 1, wherein the drain passages are provided in plural and uniformly distributed in the circumferential direction of the piston.

5. The door closer of claim 1, wherein the linkage part comprises a cam in transmission connection with the rotating shaft, the cam is sleeved outside the rotating shaft, and the periphery of the cam is hinged with the transmission rod.

6. A door closer according to claim 1, wherein the urging portion comprises a compression or gas spring abutting an end of the piston rod of the damping portion.

7. A door closer according to any one of claims 1 to 6, wherein the damping medium is hydraulic oil.

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