CN219754342U - Eccentric cam type door closer - Google Patents

Abstract

The utility model discloses an eccentric cam type door closer, which comprises a shell, wherein a piston cavity is formed in the shell along the axis direction of the shell, a cam shaft rotating along with the opening and closing actions of a door leaf is arranged in the shell, a front piston and a rear piston are respectively arranged on two sides of the cam shaft, the front piston and the rear piston are arranged in the piston cavity in a sliding mode, the cam shaft comprises a cam which is abutted to the front piston and the rear piston, connecting shafts are respectively protruded at two end faces of the cam, the two connecting shafts are coaxially arranged, the side faces of the cam are surrounded by a first convex cambered surface, a second convex cambered surface and a concave cambered surface, the angle of the first convex cambered surface is larger than that of the second convex cambered surface, and a critical edge is formed at the joint of the first convex cambered surface and the second convex cambered surface. The eccentric cam type door closer is simple in structure, and the problem of reverse reset caused by overlarge door opening angle is avoided.

Description

Eccentric cam type door closer

Technical Field

The utility model relates to the technical field of door closers, in particular to an eccentric cam type door closer.

Background

Eccentric cam type door closers have been commonly used in various fields of society as an essential facility device for modern buildings. Along with the continuous development and progress of society, the national requirements on fire protection and security are higher and higher, and a plurality of access doors and fire doors are required to be provided with door closers; the door closer in the market at present mainly comprises a hydraulic cam type door closer and an electric cam type door closer. In the hydraulic cam type door closer, the cam shaft is of a symmetrical structure, such as the cam shaft structure described in Chinese patent CN217353961U or CN217354010U, when the door leaf is designed to have the maximum opening angle, the highest point of the cam is abutted against the front piston, and when the door is closed, the front spring pushes the front piston to rotate the cam shaft, but after the door leaf is opened and closed for a long time or the door leaf opening angle caused by external force exceeds the designed maximum opening angle, namely, the highest point of the cam is rotated to the other side of the front piston, and when the door is closed, the front spring pushes the front piston to rotate the cam shaft, the rotation direction of which is opposite to the direction required by the actual door closing, so that the door leaf cannot be automatically closed. Accordingly, improvements are needed.

Disclosure of Invention

The utility model aims to provide a cam type door closer with eccentric knots, which overcomes the defects in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model discloses an eccentric cam type door closer, which comprises a shell, wherein a piston cavity is formed in the shell along the axis direction of the shell, a cam shaft rotating along with the opening and closing actions of a door leaf is arranged in the shell, a front piston and a rear piston are respectively arranged on two sides of the cam shaft, the front piston and the rear piston are arranged in the piston cavity in a sliding mode, the cam shaft comprises a cam which is abutted to the front piston and the rear piston, connecting shafts are respectively protruded and stretched on two end faces of the cam, the two connecting shafts are coaxially arranged, the side face of the cam is surrounded by a first convex cambered surface, a second convex cambered surface and a concave cambered surface, the angle of the first convex cambered surface is larger than that of the second convex cambered surface, and a critical edge is formed at the joint of the first convex cambered surface and the second convex cambered surface.

Further, in the eccentric cam type door closer, one ends of the front piston and the rear piston, which are close to the cam, are respectively provided with a front roller and a rear roller, wherein the front roller is in reciprocating abutting contact with the first convex cambered surface and the concave cambered surface, and the rear roller is in reciprocating abutting contact with the second convex cambered surface and the concave cambered surface.

Further, in the eccentric cam type door closer described above, the front roller and the rear roller are biased against the corresponding front piston and rear piston.

Further, in the eccentric cam type door closer, an avoidance groove corresponding to the cam is formed in one end, close to the cam shaft, of the rear piston.

Further, in the eccentric cam type door closer, the connecting shaft is arranged on the side wall of the piston cavity in a rotary sealing mode through the side cover.

Further, in the eccentric cam type door closer, a first sealing ring is arranged between the side cover and the shell, and a second bearing and a second sealing ring are arranged between the side cover and the connecting shaft, wherein the second sealing ring is arranged on the outer side of the second bearing.

Further, in the eccentric cam type door closer, one ends of the front piston and the rear piston, which are away from the cam shaft, are respectively provided with a front spring and a rear spring in a sealing mode through the front end cover and the rear end cover, and one ends of the front springs, which are away from the front piston, are provided with an adjusting device.

Further, in the eccentric cam type door closer, an adjusting device is arranged between the front end cover and the front spring.

Compared with the prior art, the eccentric cam type door closer is simple in structure, the first convex cambered surface and the second convex cambered surface with different angles are arranged on the side surface of the cam, when the door leaf is opened at the maximum angle, the critical edge is not contacted with the front roller of the front piston, the condition that the highest point of the cam rotates by the maximum angle does not occur, and the door leaf is ensured to be closed smoothly.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a cross-sectional view of an eccentric cam type door closer in accordance with an embodiment of the present utility model.

FIG. 2 is a schematic diagram illustrating the positions of a front piston, a camshaft, and a rear piston in an embodiment of the present utility model.

Fig. 3 is a schematic view showing positions of a front piston, a cam shaft and a rear piston in a door-open state according to an embodiment of the present utility model.

Fig. 4 is a schematic structural view of a cam shaft according to an embodiment of the present utility model.

Fig. 5 is a top view of a cam shaft according to an embodiment of the present utility model.

Detailed Description

The following detailed description of the technical solutions according to the embodiments of the present utility model will be given with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 5, an eccentric cam type door closer comprises a housing 1, which comprises a housing 1, a piston cavity is formed in the housing 1 along the axial direction of the housing, a cam shaft 2 rotating along with the opening and closing actions of a door leaf is arranged in the housing 1, a front piston 3 and a rear piston 4 are respectively arranged on two sides of the cam shaft 2, the front piston 3 and the rear piston 4 are slidably arranged in the piston cavity, the cam shaft 2 comprises a cam 21 which is abutted to the front piston 3 and the rear piston 4, two end surfaces of the cam 21 are respectively protruded with a connecting shaft 22, the two connecting shafts 22 are coaxially arranged, the side surface of the cam 21 is surrounded by a first convex arc surface 211, a second convex arc surface 212 and a concave arc surface 213, wherein the angle of the first convex arc surface 211 is larger than that of the second convex arc surface 212, and a critical edge is formed at the joint of the first convex arc surface 211 and the second convex arc surface 212.

In this technical scheme, casing, piston chamber and governing valve and corresponding oil duct all can refer to prior art setting, the one end that front piston and rear piston deviate from the camshaft is provided with preceding spring and back spring respectively, the door leaf switching in-process, drive the camshaft through rocking arm etc. and rotate, camshaft extrusion front piston and front spring, the rear piston moves to camshaft side under the effect of back spring, front piston and rear piston act on the camshaft all the time, make the camshaft atress even, when the process of opening the door ends, the elastic potential energy of its accumulation is released to the front spring, through the camshaft gyration is extruded to the front piston, the rear piston reaction is back spring, the buffering process of closing the door, avoid the door leaf striking door frame, the outermost end of connecting axle is prismatic structure, and the terminal surface center processing has the screw hole, one end is used for connecting rocking arm or connecting rod, guarantee the linkage between camshaft and the door leaf, the other end is connected supplementary thrust unit through housing closing cap or through shaft coupling etc. (such as the structure of the record in chinese patent CN 217106615U), be connected through processing with the transition axle etc. of withdrawal groove between connecting axle and the cam, the side of cam sets up the first protruding cambered surface and the second cambered surface of different angles, open to the maximum angle, the critical point is not the maximum with the front piston gyration, the maximum contact angle can take place smoothly in the process of the door leaf.

As shown in fig. 1 to 3, for example, one end of the front piston 3 and the rear piston 4, which is close to the cam 21, is provided with a front roller 31 and a rear roller 41, respectively, wherein the front roller 31 is reciprocally abutted against the first convex arc surface 211 and the concave arc surface 213, and the rear roller 41 is reciprocally abutted against the second convex arc surface 212 and the concave arc surface 213.

In this technical scheme, set up O type circle between preceding piston and back piston and the piston chamber, concrete structure and principle all belong to prior art, preceding piston and back piston are close to the one end of camshaft and are provided with the gyro wheel chamber respectively, preceding gyro wheel and back gyro wheel rotate through the installation axle and set up in the gyro wheel intracavity that corresponds, and be provided with first bearing between preceding gyro wheel and back gyro wheel and the installation axle that corresponds, preceding gyro wheel and back gyro wheel are close to the one end of camshaft all outstanding in the gyro wheel chamber that corresponds, guarantee the contact with the cam, preceding piston and back piston deviate from the inside relief valve (not marked) that all is provided with of one end of camshaft, avoid the casing burst that the door leaf is too fast to open and close to cause, concrete structure belongs to prior art, just not repeated here, preceding gyro wheel is reciprocal to be held in first protruding cambered surface and concave cambered surface, correspond, back gyro wheel is reciprocal to be held in second protruding cambered surface and concave cambered surface, the cam rotation process, critical arris can not rotate preceding gyro wheel and back gyro wheel most outstanding part.

Illustratively, referring to fig. 1-3, the front roller 31 and the rear roller 41 are biased against the corresponding front piston 3 and rear piston 4.

In the technical scheme, the front roller and the rear roller are biased to the corresponding front piston and rear piston, the biasing distances are the same or different, the mounting shafts of the front roller and the rear roller are biased to one side close to the second convex cambered surface when in a door closing state according to the designed maximum opening angle, and the critical edges still cannot rotate the most protruding parts of the front roller and the rear roller even if the door opening angle exceeds the maximum opening angle.

For example, referring to fig. 1 to 3, the rear piston 4 is provided with a relief groove 42 corresponding to the cam 21 at an end near the cam shaft 2.

In the technical scheme, the cam is of an asymmetric structure, and the avoidance groove avoids interference between the cam and the rear piston in the rotation process.

Illustratively, referring to FIG. 1, the connecting shaft 22 is rotatably sealed to the side wall of the piston chamber by a side cap.

In this technical scheme, limit lid structure belongs to current structure, can directly use, and its mounted position is according to the position of camshaft and decides, and the cam is asymmetric structure, and the biggest radius of gyration in both sides is different, and the camshaft is biased to the protruding cambered surface of second one side in the piston chamber, avoids the inner wall interference in cam and piston chamber, and preceding gyro wheel is the same with the offset distance of camshaft, and when closing the door, preceding gyro wheel supports in concave cambered surface, realizes the location of closing state, makes things convenient for the location installation of camshaft.

Illustratively, referring to fig. 1, a first sealing ring is provided between the side cover and the housing 1, and a second bearing and a second sealing ring are provided between the side cover and the connecting shaft 22, wherein the second sealing ring is provided outside the second bearing.

In this technical scheme, the limit lid is fixed in casing 1 through threaded connection to guarantee its sealing performance with the casing through first sealing washer, its terminal surface is provided with the afterburning hole of circumference array, is used for dismouting limit lid, the setting of second bearing, makes the camshaft free rotation, and the leakproofness between limit lid and the camshaft is guaranteed in the setting of second sealing washer, thereby improves the holistic leakproofness of casing.

As shown in fig. 1, for example, the front piston 3 and the rear piston 4 are each provided with a front spring 5 and a rear spring 6 at their ends facing away from the camshaft 2, the front spring being provided with an adjusting device at its ends facing away from the front piston 3.

In this technical scheme, pass through threaded connection between front end housing and rear end housing and the casing to set up the third sealing washer, guarantee the leakproofness in piston chamber, in the door leaf switching process, drive the camshaft through rocking arm etc. and rotate, piston and preceding spring before the camshaft extrusion, the back piston moves to the camshaft side under the back spring effect, preceding piston and back piston act on the camshaft all the time, make the camshaft atress even, when the process of opening the door ends, preceding spring release its elastic potential energy of accumulating, through preceding piston extrusion camshaft gyration, the back piston reaction is the back spring, buffering process of closing the door, avoid the door leaf striking door frame.

For example, as shown in fig. 1, an adjusting device 7 is arranged between the front end cap and the front spring.

According to the technical scheme, the adjusting device comprises an adjusting bolt which is sealed and rotated on the front end cover and an adjusting plate which is propped against the front spring, and the front and rear positions of the adjusting plate can be adjusted by rotating the adjusting bolt, so that the tightness of the front spring can be adjusted, and the door opening force can be adjusted; for convenient adjustment, the outer end of the adjusting bolt is provided with a straight groove (not shown) and the like, and is matched with tools such as a spanner and the like for use; in order to avoid the follow-up, the adjusting plate and the shell can be connected through a dovetail groove and other conventional structures, and the structures described in Chinese patent CN217353961U or CN217354010U can also be directly utilized.

In summary, the eccentric cam type door closer disclosed by the utility model has a simple structure, the side surface of the cam is provided with the first convex cambered surface and the second convex cambered surface with different angles, when the door leaf is opened at the maximum angle, the critical edge is not contacted with the front roller of the front piston, the condition that the highest point of the cam rotates by the maximum angle does not occur, and the door leaf is ensured to be closed smoothly.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely illustrative of the embodiments of this utility model and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the utility model, and it is intended to cover all modifications and variations as fall within the scope of the utility model.

Claims (8)

1. The utility model provides an eccentric cam formula door closer, its characterized in that, includes the casing, be formed with the piston chamber in the casing along its axis direction, be provided with in the casing along with the rotatory camshaft of door leaf's switching action, the both sides of camshaft are provided with preceding piston and rear piston respectively, preceding piston and rear piston slide set up in the piston chamber, the camshaft includes the cam of butt in preceding piston and rear piston, the both ends face of cam is protruding the extension respectively has the connecting axle, two the connecting axle is coaxial to be set up, the side of cam is enclosed by first protruding cambered surface, the protruding cambered surface of second and concave cambered surface, and wherein, the angle of first protruding cambered surface is greater than the angle of the protruding cambered surface of second, first protruding cambered surface and the protruding cambered surface junction of second are formed with critical arris.

2. The eccentric cam door closer of claim 1 wherein: the front roller and the rear roller are respectively arranged at one ends of the front piston and the rear piston, which are close to the cam, wherein the front roller is in reciprocating abutting contact with the first convex cambered surface and the concave cambered surface, and the rear roller is in reciprocating abutting contact with the second convex cambered surface and the concave cambered surface.

3. The eccentric cam door closer of claim 2 wherein: the front roller and the rear roller are biased against the corresponding front piston and rear piston.

4. The eccentric cam door closer of claim 2 wherein: and one end of the rear piston, which is close to the cam shaft, is provided with an avoidance groove corresponding to the cam.

5. The eccentric cam door closer of claim 1 wherein: the connecting shaft is arranged on the side wall of the piston cavity in a rotary sealing mode through the side cover.

6. The eccentric cam door closer of claim 5 wherein: the side cover is provided with a first sealing ring between the side cover and the shell, and a second bearing and a second sealing ring are arranged between the side cover and the connecting shaft, wherein the second sealing ring is arranged on the outer side of the second bearing.

7. The eccentric cam door closer of claim 1 wherein: the front spring and the rear spring are respectively packaged at one ends of the front piston and the rear piston, which are away from the cam shaft, and an adjusting device is arranged at one end of the front spring, which is away from the front piston.

8. The eccentric cam door closer of claim 7 wherein: an adjusting device is arranged between the front end cover and the front spring.