Door closer with cam type structure

Abstract

The utility model relates to a door closer with a cam type structure, which comprises a shell, a rotating shaft and a piston, the piston longitudinally slides in the shell, an energy storage elastic component is arranged between one end of the piston and the end part of the shell, the rotating shaft is transversely connected to the shell, and the piston is provided with a sliding avoiding groove corresponding to the rotating shaft. A cam peach is fixedly arranged on the rotating shaft, a roller abutting against the edge of the cam peach is arranged on the side, close to the energy storage elastic assembly, of the piston, and when the rotating shaft rotates, the cam peach extrudes and pushes the roller so that the piston can move front and back. The door closer is driven through a cam structure, the non-uniformity of the closing speed of a traditional door closer is effectively reduced, the wind pressure resistance is enhanced, meanwhile, compared with a traditional design, the torque during door opening and closing is greatly optimized, and more stable and safer use experience is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of door closer, specifically is the cam type structure's door closer. BACKGROUND

[0002] The door closer is a hydraulic device similar to a spring on the door head, which can automatically close the door after being opened by compression and release, has the function of a spring door, and can ensure that the door is accurately and timely closed to the initial position after being opened.

[0003] During the spring release process of the door closer, the hydraulic oil in the door closer flows back and forth in the oil passage and the gap, thereby forming resistance to the spring release of the hydraulic oil, that is, the throttling achieves the buffering effect, and the closing speed of the door is controlled.

[0004] The current common door closer can only be applied to small doors, the torque during door opening and closing is low, and the closing speed is uneven, the wind pressure resistance is weak, and the door opening is not stable, so the door closer needs to be further improved. INVENTION CONTENTS

[0005] The utility model aims at solving the above-mentioned problems, and provides a cam type structure's door closer with simple and reasonable structure, which realizes strong closing force and stable closing speed.

[0006] The cam type structure's door closer comprises a shell, a rotating shaft and a piston, the piston longitudinally slides in the shell, an energy storage elastic assembly is arranged between one end of the piston and the end of the shell, the rotating shaft is transversely connected to the shell, the piston is provided with a sliding avoiding groove corresponding to the rotating shaft, a cam peach is fixedly arranged on the rotating shaft, a roller abutting against the edge of the cam peach is arranged on the side of the piston close to the energy storage elastic assembly, and the piston moves forward and backward by the cam peach pushing the roller when the rotating shaft rotates.

[0007] The utility model can also solve the problems by using the following technical measures:

[0008] As a more specific scheme, the piston is partitioned by a first oil cavity and a second oil cavity in the shell, an oil passage is arranged in the shell to communicate the first oil cavity and the second oil cavity, and hydraulic oil is filled in the shell to reciprocally transfer between the first oil cavity and the second oil cavity.

[0009] As a further scheme, the middle of the piston is hollowed out to form a rotating shaft oil cavity, the rotating shaft and the cam peach are arranged in the rotating shaft oil cavity, a front oil passage is arranged in the front end of the piston to communicate the first oil cavity and the rotating shaft oil cavity, a front safety valve is arranged in the front oil passage, a rear oil passage is arranged in the rear end of the piston to communicate the second oil cavity and the rotating shaft oil cavity, and a rear safety valve is arranged in the rear oil passage.

[0010] As a further scheme, the first inlet and outlet oil hole in communication with the first oil cavity, the second inlet and outlet oil hole, the third inlet and outlet oil hole in communication with the rotating shaft oil cavity, the fourth inlet and outlet oil hole in communication with the second oil cavity and the fifth inlet and outlet oil hole are sequentially arranged on the oil passage, a first closing speed adjusting valve is arranged in the first inlet and outlet oil hole, a second closing speed adjusting valve is arranged in the third inlet and outlet oil hole, and an opening door buffer adjusting valve is arranged in the fifth inlet and outlet oil hole.

[0011] As a further scheme, a force adjusting nut is further axially slidably arranged in the shell, the force adjusting nut is abutted between the end of the energy storage elastic assembly away from the piston and the end of the shell, and a door closing force adjusting assembly for driving the force adjusting nut to move forward and backward is arranged on the shell.

[0012] As a further scheme, an axle seat extends upwards from the piston, a roller shaft is connected between the axle seat and the piston, and a roller is rotatably connected to the roller shaft; and a positioning groove in communication with the roller is arranged on the base circle portion of the cam peach at a position opposite to the sharp portion.

[0013] As a further scheme, the energy storage elastic assembly comprises a large spring and a small spring, the small spring is axially arranged in the large spring, one end of the large spring and the small spring is abutted on the end of the shell, and the other end of the large spring and the small spring is abutted on one end of the piston.

[0014] As a further scheme, the door closing force adjusting assembly comprises a force adjusting screw rotatably connected to the end of the shell, a threaded section is arranged on the inner end of the force adjusting screw, the threaded section and the force adjusting nut form a screw rod cooperation, the outer end of the force adjusting screw extends out of the end cover and is connected with a driven force adjusting bevel gear, an adjusting nut is arranged on the shell, and a driving force adjusting bevel gear meshing with the driven force adjusting bevel gear is connected to the adjusting nut.

[0015] As a further scheme, the front safety valve and the rear safety valve of the piston each comprises a valve seat, an upper passage and a lower passage in communication with the front oil passage or the rear oil passage are arranged in the valve seat, a filter screen is arranged on the side of the upper passage and the lower passage close to the rotating shaft oil cavity, a closing one-way valve is arranged in one of the upper passage and the lower passage, and an opening one-way valve is arranged in the other of the upper passage and the lower passage.

[0016] As a further scheme, a limiting groove is arranged on one side of the force adjusting nut along the movement direction of the force adjusting nut, a mounting through hole corresponding to the limiting groove is arranged on the shell, and a nut fixing screw in lock buckle cooperation with the limiting groove is tightly connected in the mounting through hole.

[0017] The beneficial effects of the utility model are as follows:

[0018] The utility model discloses a cam structure's door closer, this kind of closer utilizes cam structure and gyro wheel cooperation, provides powerful closing force and stable closing speed, the powerful force that is set before closing ensures that even hidden door closer can be steady closing, especially suitable for major fan door.

[0019] Its cam structure effectively reduces the unevenness of traditional door closer on closing speed, enhances the wind pressure performance, and the torque when opening and closing is greatly optimized compared with traditional design, ensures more stable and safe use experience.

[0020] In addition, the structure realizes smooth and consistent closing speed through rich hydraulic oil flow, not only has excellent wind pressure performance, but also helps to reduce the discomfort when opening and closing. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is cross section structure schematic diagram of an embodiment in the utility model.

[0022] Figure 2 It is cross section structure schematic diagram of oil flow channel in the utility model.

[0023] Figure 3 It is cam peach and gyro wheel structure schematic diagram in the utility model.

[0024] Figure 4 It is cam peach and gyro wheel structure exploded schematic diagram in the utility model.

[0025] Figure 5 It is door closer closing state structure schematic diagram in the utility model.

[0026] Figure 6 It is door closer opening state structure schematic diagram in the utility model.

[0027] Figure 7 It is piston safety valve structure schematic diagram in the utility model.

[0028] Figure 8 It is door closer exploded structure schematic diagram in the utility model. DETAILED DESCRIPTION

[0029] The utility model is further explained below in connection with the drawings and examples.

[0030] REFERENCE Figures 1 to 8As shown, the cam structure of the door closer includes a housing 1, a rotating shaft 2 and a piston 3, the piston 3 longitudinally slides in the housing 1, and an energy storage elastic assembly 5 is arranged between one end of the piston 3 and the end of the housing 1, the rotating shaft 2 is transversely connected to the housing 1, and the piston 3 is provided with a sliding avoiding groove 31 corresponding to the rotating shaft 2, and a cam peach 7 is fixedly arranged on the rotating shaft 2, and the side of the piston 3 close to the energy storage elastic assembly 5 is provided with a roller 9 abutting against the edge of the cam peach 7, when the rotating shaft 2 rotates, the roller 9 is pushed by the cam peach 7 to make the piston 3 move forward and backward.

[0031] This door closer utilizes the cam structure and the roller to provide strong closing force and stable closing speed, and the strong force set before closing the door ensures that even the hidden door closer can be stably closed, and the cam structure cooperates to effectively reduce the unevenness of the traditional door closer in the closing speed, enhances the wind pressure resistance performance, and greatly optimizes the torque when opening and closing the door compared with the traditional design, ensures more stable and safe use experience.

[0032] The piston 3 is partitioned by a first oil cavity 101 and a second oil cavity 102 in the housing 1, the energy storage elastic assembly is arranged in the second oil cavity 102, a through oil flow channel 103 communicating the first oil cavity 101 and the second oil cavity 102 is arranged in the housing 1, and hydraulic oil reciprocatingly transferring between the first oil cavity 101 and the second oil cavity 102 is filled in the housing 1, this structure realizes smooth and consistent closing speed through abundant hydraulic oil flow, not only has excellent wind pressure resistance performance, but also helps to reduce the discomfort when opening and closing the door.

[0033] The middle of the piston 3 is hollowed out to form a rotating shaft oil cavity 301, the rotating shaft 2 and the cam peach 7 are arranged in the rotating shaft oil cavity 301, a front through oil channel 302 communicating the first oil cavity 101 and the rotating shaft oil cavity is arranged at the front end of the piston 3, a piston front safety valve 4 is arranged in the front through oil channel 302, a rear through oil channel 303 communicating the second oil cavity 102 and the rotating shaft oil cavity 301 is arranged at the rear end of the piston 3, and a piston rear safety valve 6 is arranged in the rear through oil channel 303.

[0034] The through oil flow channel 103 is sequentially provided with a first inlet and outlet oil hole 105, a second inlet and outlet oil hole 106, a third inlet and outlet oil hole 107 and a fourth inlet and outlet oil hole 108 and a fifth inlet and outlet oil hole 109, and a one-door speed adjusting valve 14 is arranged in the first inlet and outlet oil hole 105, a two-door speed adjusting valve 15 is arranged in the third inlet and outlet oil hole 107, and an opening door buffer adjusting valve 16 is arranged in the fifth inlet and outlet oil hole 109.

[0035] The piston front safety valve 4 is responsible for not allowing hydraulic oil to backflow when closing the door, allowing hydraulic oil to backflow to the rotating shaft oil cavity 301 through a closing speed regulating valve 14, and absorbing impact force when violent closing occurs.

[0036] The piston rear safety valve 6 is responsible for not allowing hydraulic oil to backflow when opening the door, allowing hydraulic oil to backflow to the rotating shaft oil cavity 301 through an opening buffer regulating valve 16, and absorbing impact force when violent closing occurs.

[0037] In addition, the front end and the rear end of the piston 2 are provided with sealing rings 20 abutting against the inner wall of the shell 1, so that the rotating shaft oil cavity 301 is separated from the first oil cavity 101 and the second oil cavity 102.

[0038] The shell 1 further axially slidably has a force adjusting nut 10 abutting between the end of the energy storage elastic assembly 5 opposite to the piston and the end of the shell 1, and the shell 1 is provided with a closing force adjusting assembly 11 driving the force adjusting nut 10 to move forward and backward, so that the tightness of the energy storage elastic assembly 5 is compressed by driving the force adjusting nut 10 to move longitudinally forward and backward in the inner cavity of the shell 1, thereby adjusting the damping force of the door closer when opening and closing the door.

[0039] The upper side of the piston 3 extends with a shaft seat 32, the shaft seat 32 is connected with a roller shaft 44 between the piston 3, and the roller shaft 44 is rotationally connected with a roller 9; the base circle part of the cam peach 7 is provided with a positioning groove 72 abutting against the roller 9 at the position opposite to the sharp part 71; the positioning groove 72 can make the door closer quickly and stably in the closing state, and will not be shaken open back and forth under light external force (wind pressure), thereby improving the wind pressure resistance performance.

[0040] The energy storage elastic assembly 5 includes a large spring 51 and a small spring 52, the small spring 52 is axially arranged in the large spring 51, and one end of the large spring 51 and the small spring 52 abuts against the end of the shell 1, and the other end of the large spring 51 and the small spring 52 abuts against one end of the piston 3.

[0041] In the embodiment, the spring diameter and the wire diameter of the large spring 51 are both larger than the spring diameter and the wire diameter of the small spring 52; when the energy storage elastic assembly 5 is stressed and stretched, the large spring 51 and the small spring 52 are simultaneously compressed by the piston, but the large spring 51 and the small spring 52 are arranged in a sleeve manner, do not interfere with each other when stretching, are not easy to deform, effectively improve the service life of the large spring 51 and the small spring 52 and the elasticity of the energy storage elastic assembly 5, and ensure the vertical stability of the spring force, thereby preventing the large spring 51 and the small spring 52 from being damaged due to excessive load.

[0042] The door closing force adjusting assembly 11 comprises a force adjusting screw 111 rotatably connected to the end of the shell 1, the inner end of the force adjusting screw 111 is provided with a threaded section 112, the threaded section 112 cooperates with the force adjusting nut 10 as a screw rod, the outer end of the force adjusting screw 111 extends out of the end cover and is connected with a driven force adjusting bevel gear 113, the shell 1 is provided with an adjusting nut 114, the adjusting nut 114 is connected with a driving force adjusting bevel gear 115 engaged with the driven force adjusting bevel gear 113;

[0043] Since the door closer is hidden in the installed door, it is not easy to directly adjust the force by the force adjusting screw 111, therefore, the adjusting position is placed on the outer exposed panel by the pair of 90° opposed driven force adjusting bevel gears 113 and driving force adjusting bevel gears 115, and the adjustment is more convenient.

[0044] The both ends of the shell 1 are tightly connected with mounting ears 19, the adjusting nut 114 is rotatably connected to the mounting ears 19, when the adjusting nut 114 is rotated in the forward and reverse directions, the driving force adjusting bevel gear 115 drives the driven force adjusting bevel gear 113 and drives the force adjusting screw 111 to rotate axially, finally drives the force adjusting nut 10 to move forward or backward through the screw rod cooperation, the adjustment is realized by the double bevel gears, which can improve the transmission torque, has high transmission precision, good load and fatigue resistance, generally does not need lubrication, stable operation, small noise and other advantages.

[0045] The piston front safety valve 4 and the piston rear safety valve 6 both comprise a valve seat 131, the valve seat 131 is provided with an upper passage 132 and a lower passage 133 communicated with the front oil passage or the rear oil passage 303, the upper passage 132 and the lower passage 133 are provided with a filter screen 134 on the side close to the rotating shaft oil cavity, and one of the upper passage 132 and the lower passage 133 is provided with a closing one-way valve 17, and the other of the upper passage 132 and the lower passage 133 is provided with an opening one-way valve 18.

[0046] In the piston front safety valve 4, the upper passage 132 is provided with the closing one-way valve 17, and the lower passage 133 is provided with the opening one-way valve 18.

[0047] The closing one-way valve 17 comprises an upper sealing steel ball 171 and a sealing spring 172, the upper passage 132 is provided with a small hole 135 at the end away from the oil passage 301, and the upper sealing steel ball 171 is elastically abutted on the small hole 135 by the sealing spring 172.

[0048] The opening-door check valve 18 comprises a lower sealing steel ball 181, the lower passage 133 comprises a front section passage 133a with a diameter larger than the lower sealing steel ball 181 and a rear section passage 133b with a diameter smaller than the lower sealing steel ball 181, the lower sealing steel ball 181 is movably arranged in the front section passage 133a, the lower sealing steel ball 181 can be blocked at the port of the rear section passage 133b, and the front section passage 133a is provided with a protrusion 136 away from one end of the oil passing passage 301, and the lower sealing steel ball 181 is limited in the front section passage 133a by the protrusion 136.

[0049] And the valve seat 131 is provided with a lock column 137 penetrating the upper passage 132 and the lower passage 133, and the upper sealing steel ball 171 and the sealing spring 172 are limited in the upper passage 132 by the lock column 137.

[0050] In the piston rear safety valve 6, the piston rear safety valve 6 is symmetrically arranged with the structure of the piston front safety valve 4, at this time, the opening-door check valve 18 is arranged in the upper passage 132, the opening-door check valve 18 is the same as the structure of the closing-door check valve 17 of the piston front safety valve 4, and the closing-door check valve 17 is arranged in the lower passage 133, and the closing-door check valve 17 is the same as the structure of the opening-door check valve 18 of the piston front safety valve 4.

[0051] One side of the force adjusting nut 10 is provided with a limiting groove 1001 along the movement direction of the force adjusting nut 10, the shell 1 is provided with a mounting through hole 104 corresponding to the limiting groove 1001, and the mounting through hole 104 is tightly connected with a nut fixing screw 12 which is locked with the limiting groove 1001; by being locked in the limiting groove 1001 through the nut fixing screw 12, the force adjusting nut 10 can be prevented from rotating along the driving shaft when the force adjusting screw 111 is adjusted, so that the force adjusting nut 10 can only move linearly forward and backward.

[0052] The above is the preferred scheme of the utility model, the basic principle, the main features and the advantages of the utility model are displayed and described. Those skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A door closer of cam type structure comprising a housing (1), a rotating shaft (2) and a piston (3), characterized in that: The piston (3) longitudinally slides in the shell (1), and an energy storage elastic assembly (5) is arranged between one end of the piston (3) and the end of the shell (1); the rotating shaft (2) is transversely connected to the shell (1), and the piston (3) is provided with a sliding avoiding groove (31) corresponding to the rotating shaft (2); and the rotating shaft (2) is fixedly provided with a cam peach (7), and the side of the piston (3) close to the energy storage elastic assembly (5) is provided with a roller (9) abutting against the edge of the cam peach (7); when the rotating shaft (2) rotates, the roller (9) is pushed by the cam peach (7) to make the piston (3) move forward and backward.

2. A cammed-structure door closer according to claim 1, characterised in that: The piston (3) is separated by a first oil cavity (101) and a second oil cavity (102) in the shell (1), and the shell (1) is provided with an oil passing flow channel (103) respectively communicating with the first oil cavity (101) and the second oil cavity (102); and the shell (1) is filled with hydraulic oil reciprocatingly transferred between the first oil cavity (101) and the second oil cavity (102).

3. A cammed-structure door closer according to claim 2, wherein: The middle of the piston (3) is hollowed out to form a rotating shaft oil cavity (301), the rotating shaft (2) and the cam peach (7) are arranged in the rotating shaft oil cavity (301), and the front end of the piston (3) is provided with a front oil passing channel (302) communicating with the first oil cavity (101) and the rotating shaft oil cavity; the front oil passing channel (302) is provided with a front safety valve (4); and the rear end of the piston (3) is provided with a rear oil passing channel (303) communicating with the second oil cavity (102) and the rotating shaft oil cavity (301), and the rear oil passing channel (303) is provided with a rear safety valve (6).

4. A cammed-structure door closer according to claim 3, wherein: The oil passing flow channel (103) is sequentially provided with a first oil inlet and outlet hole (105) communicating with the first oil cavity (101), a second oil inlet and outlet hole (106), a third oil inlet and outlet hole (107) communicating with the rotating shaft oil cavity (301), a fourth oil inlet and outlet hole (108) and a fifth oil inlet and outlet hole (109) communicating with the second oil cavity (102); a one-door closing speed adjusting valve (14) is arranged in the first oil inlet and outlet hole (105), a two-door closing speed adjusting valve (15) is arranged in the third oil inlet and outlet hole (107), and an opening-door buffer adjusting valve (16) is arranged in the fifth oil inlet and outlet hole (109).

5. A cammed-structure door closer according to claim 1, wherein: The shell (1) is further provided with a force adjusting nut (10) axially sliding, the force adjusting nut (10) is arranged between the end of the energy storage elastic assembly (5) opposite to the piston and the end of the shell (1), and the shell (1) is provided with a door closing force adjusting assembly (11) driving the force adjusting nut (10) to move forward and backward.

6. A cammed-structure door closer according to claim 1, wherein: The upper side of the piston (3) extends a shaft seat (32), the shaft seat (32) and the piston (3) are connected with a roller shaft (44), and the roller (9) is rotatably connected to the roller shaft (44); and the base circle part of the cam peach (7) is provided with a fixed groove (72) clamped with the roller (9) at the position opposite to the sharp part (71).

7. A cammed-structure door closer according to claim 1, wherein: The energy storage elastic component (5) comprises a large spring (51) and a small spring (52), the small spring (52) is axially arranged in the large spring (51), one end of the large spring (51) and the small spring (52) abuts on the end of the shell (1), and the other end of the large spring (51) and the small spring (52) abuts on one end of the piston (3).

8. A cammed-structure door closer according to claim 5, wherein: The door closing force adjusting assembly (11) comprises a force adjusting screw (111) rotatably connected to the end of the shell (1), the inner end of the force adjusting screw (111) is provided with a threaded section (112), the threaded section (112) and the force adjusting nut (10) are in screw rod cooperation, the outer end of the force adjusting screw (111) extends out of the end cover and is connected with a driven force adjusting bevel gear (113), the shell (1) is provided with an adjusting nut (114), the adjusting nut (114) is connected with a driving force adjusting bevel gear (115) engaged with the driven force adjusting bevel gear (113).

9. A cammed-structure door closer according to claim 3, wherein: The piston front safety valve (4) and the piston rear safety valve (6) each comprise a valve seat (131), the valve seat (131) is provided with an upper passage (132) and a lower passage (133) in communication with the front oil passage or the rear oil passage (303), the upper passage (132) and the lower passage (133) are provided with a filter screen (134) on the side close to the rotating shaft oil cavity, one of the upper passage (132) and the lower passage (133) is provided with a door opening one-way valve (18), and the other of the upper passage (132) and the lower passage (133) is provided with a door closing one-way valve (17).

10. A cammed-structure door closer according to claim 5, wherein: One side of the force adjusting nut (10) is provided with a limiting recess (1001) along the movement direction thereof, the shell (1) is provided with a mounting through hole (104) corresponding to the limiting recess (1001), and the mounting through hole (104) is tightly connected with a nut fixing screw (12) in locking cooperation with the limiting recess (1001).

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