Novel cam action hydraulic door closer

Abstract

To provide a novel cam action hydraulic door closer particularly, in a technical field of a door closer.SOLUTION: Omitting a gear and a rack structure greatly simplifies the structure and volume of a door closer. A bidirectional piston always abuts in an elastic manner on an outer circumferential surface of a transmission camshaft through a driving spring. When the transmission camshaft operates, the bidirectional piston moves in conjunction therewith, the driving spring is compressed, and the driving spring stores force. At the same time, an overload valve realizes a circulation of hydraulic oil between a spindle chamber and a spring chamber. Therefore, when the transmission camshaft rotates in a door closer housing, the bidirectional piston is subjected to damping effect on the transmission camshaft and the damping effect of hydraulic oil. This reduces the instantaneous speed when the door is closed, and a new cam action hydraulic door closer provides a sufficient cushioning effect when the door is closed. In this way, the new cam action hydraulic door closer of the present invention has the advantages including simple structure, easy assembly, high production efficiency, low failure rate, and stable performance.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of door closers, and particularly to a new type of cam hydraulic door closer.

Background Art

[0002] Door closers are mainly used in commercial and public buildings, and may also be used in homes. Door closers have many applications, and the most important of which is to close the door to limit the spread of fire and ventilation within the building.

[0003] The basic components of a hydraulic door closer include a support guide member, a transmission gear, a return spring, a check valve, a rack plunger, a throttle valve core and a housing, an end cover, a sealing ring, and a connecting rod. The housing and the connecting rod serve to fix the door closer and connect the door and the door frame. When the door is opened, the door body actuates the connecting rod to rotate the transmission gear and move the rack plunger to the right. During the process of the plunger moving to the right, the spring is compressed and the hydraulic oil in the right chamber is compressed. The check valve sphere on the left side of the plunger is opened by the hydraulic pressure, and the hydraulic oil in the right chamber flows through the check valve into the left chamber. After the process of the door opening is completed, the spring, having been compressed during the opening process, releases the accumulated elastic energy, pushes the plunger to the left, and interlocks the transmission gear and the door closer connecting rod to close the door.

[0004] However, current commercially available door closers have the disadvantages of a large number of parts, a complex structure, low production efficiency, a high failure rate, and unstable performance.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of the present invention is to provide a new type of cam hydraulic door closer, and to solve the technical problems in the door closer of the prior art, such as complex structure, low production efficiency, high failure rate, and unstable performance.

Means for Solving the Problems

[0006] In order to achieve the above object, the new type of cam hydraulic door closer according to an embodiment of the present invention includes a door closer housing, a bidirectional piston, a transmission camshaft, and a driving spring. In the door closer housing, an inner cavity filled with hydraulic oil is provided along its axial direction inside the door closer housing. The bidirectional piston is movably penetrated into the inner cavity, and partitions the inner cavity into a main shaft chamber and a spring chamber. The transmission camshaft has an axial direction perpendicular to the extension direction of the door closer housing, is rotatably connected into the door closer housing, and is accommodated in the main shaft chamber. The driving spring is accommodated in the spring chamber, and both ends are respectively abutted against the bidirectional piston and the door closer housing, so that the bidirectional piston abuts against and presses the transmission camshaft. A fluid passage communicating the main shaft chamber and the spring chamber is penetrated through the bidirectional piston, and an overload valve is attached to the fluid passage. The overload valve is configured to allow the flow of hydraulic oil between the main shaft chamber and the spring chamber when the pressure in the main shaft chamber exceeds a predetermined threshold value.

[0007] Preferably, the overload valve includes a valve body, a valve core member, and a core spring. The valve body is attached in the fluid passage, and valve flow paths communicating with the main shaft chamber and the fluid passage are penetrated therethrough. The valve core member is movably installed in the valve flow path and is used to realize the opening or blocking of the valve flow path. The core spring is accommodated in the valve flow path, one end thereof is abutted against the inside of the bi-directional piston, the other end thereof is abutted against the valve core member, and the valve core member is urged to block the valve flow path.

[0008] Preferably, a first bearing cylinder is installed at a position corresponding to the lower end of the transmission camshaft in the door closer housing, a position limiting mounting seat is installed at a position corresponding to the upper end of the transmission camshaft, a second bearing cylinder is installed on the position limiting mounting seat, the midpoints of the first bearing cylinder and the second bearing cylinder are located on the same axis, and the transmission camshaft is provided to penetrate through the first bearing cylinder and the second bearing cylinder.

[0009] Preferably, an outer peripheral seal ring is installed between the outer end face of the position limiting mounting seat and the door closer housing, and an inner peripheral seal ring is installed between the inner end face of the position limiting mounting seat and the transmission camshaft.

[0010] Preferably, it further includes fixed mounting members. Two fixed mounting members are installed. The two fixed mounting members are provided symmetrically at both ends of the door closer housing, and the fixed mounting members and the door closer housing are fixed by a plurality of fixing screws.

[0011] Preferably, the fixed mounting member is installed in an L shape and includes a door body connecting plate and a housing connecting plate that are integrally formed. The door body connecting plate is installed horizontally and is fixed to the door body by a plurality of fixing screws. The housing connecting plate is installed vertically and is fixed to the door closer housing by a plurality of fixing screws.

[0012] Preferably, lock holes for mounting fixing screws are provided through the door body connecting plate and the housing connecting plate.

[0013] Preferably, the door closer housing includes a housing body and a sealing end cover. The housing body has a hollow interior and both sides are open, and the transmission camshaft is rotatably connected to the housing body. There are two of the sealing end covers, which are respectively installed at the openings on both sides of the housing body, and form the inner cavity by surrounding each other, and an end cover seal ring is installed between the outer end face of the sealing end cover and the housing body.

[0014] One or more of the above-mentioned means of the eccentric cam door closer for a glass door according to the present invention has at least one of the following technical effects. This new type of cam hydraulic door closer omits the structure of gears and racks, and greatly simplifies the structure and volume of the door closer. The bi-directional piston always softly abuts against the outer peripheral surface of the transmission camshaft via the driving spring. When the transmission camshaft operates, the bi-directional piston interlocks, compressing the driving spring, and the driving spring stores force. At the same time, the overload valve realizes the circulation of the hydraulic oil between the main shaft chamber and the spring chamber. Therefore, when the transmission camshaft rotates in the door closer housing, the bi-directional piston is subject to the damping action on the transmission camshaft and the damping action of the hydraulic oil. As a result, the instantaneous speed when the door is closed is reduced, and when the door is closed, sufficient buffering action is performed by this new type of cam hydraulic door closer. Thus, the new type of cam hydraulic door closer of the present invention has the advantages of simple structure, easy assembly, high production efficiency, low failure rate, and stable performance.

[0015] To more clearly explain the technical aspects in the embodiments of the present invention, the drawings required in the following description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings from these drawings without creative efforts.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the drawings. Here, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative for explaining the embodiments of the invention and should not be construed as limitations on the present invention.

[0018] In the description of the embodiments of the present invention, the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is the orientation or positional relationship shown based on the drawings, and is for the purpose of explaining the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or member needs to have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0019] Furthermore, the terms "first" and "second" are used for purposes of description and should not be construed as indicating relative importance or implying any number of technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

[0020] In embodiments of the present invention, terms such as "attach", "connect to each other", "connect", "fix", etc. should be understood broadly unless specifically defined otherwise. For example, they may be fixedly connected, removably connected, integrated, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or may be internal communication between two members or interaction between two members. A person skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific situation.

[0021] (First Embodiment) In the first embodiment of the present invention, as shown in FIG. 1, the new cam hydraulic door closer includes a door closer housing 100, a bidirectional piston 200, a transmission camshaft 300, and a driving spring 400.

[0022] The door closer housing 100 is provided with an inner cavity 110 filled with hydraulic oil along its axial direction inside the door closer housing 100.

[0023] The bidirectional piston 200 is movably disposed through the inner cavity 110 and partitions the inner cavity 110 into a main shaft chamber 111 and a spring chamber 112.

[0024] The transmission camshaft 300 has an axial direction perpendicular to the extension direction of the door closer housing 100, is rotatably connected into the door closer housing 100, and is accommodated in the main shaft chamber 111.

[0025] The driving spring 400 is housed in the spring chamber 112, and both ends thereof are respectively in contact with the bi-directional piston 200 and the door closer housing 100. The driving spring 400 causes the bi-directional piston 200 to contact and press against the transmission camshaft 300.

[0026] A fluid passage 210 that communicates the main shaft chamber 111 and the spring chamber 112 is provided through the bi-directional piston 200. An overload valve 500 is attached to the fluid passage 210. The overload valve 500 is configured to allow the flow of hydraulic oil between the main shaft chamber 111 and the spring chamber 112 when the pressure in the main shaft chamber 111 exceeds a predetermined threshold value.

[0027] Specifically, in this embodiment, the structure of the gear and the rack of this eccentric hydraulic door closer is omitted, and the structure and volume of the door closer are greatly simplified. The bi-directional piston 200 always softly contacts the outer peripheral surface of the transmission camshaft 300 via the driving spring 400. When the transmission camshaft 300 operates, the bi-directional piston 200 interlocks, the driving spring 400 is compressed, and the driving spring 400 stores force. At the same time, the overload valve 500 enables the flow of hydraulic oil between the main shaft chamber 111 and the spring chamber 112. Therefore, when the transmission camshaft 300 rotates in the door closer housing 100, the bi-directional piston 200 is subject to the damping action of the transmission camshaft 300 and the damping action of the hydraulic oil. As a result, the instantaneous speed when the door is closed is reduced, and when the door is closed, sufficient buffering action is performed by this eccentric hydraulic door closer. Thus, the eccentric hydraulic door closer of the present invention has the advantages of simple structure, easy assembly, high production efficiency, low failure rate, and stable performance.

[0028] (Second Embodiment) In the second embodiment of the present invention, as shown in FIG. 3, the overload valve 500 includes a valve body 510, a valve core member 530, and a core spring 540.

[0029] The valve body 510 is installed in the fluid passage 210, and a valve passage 520 communicating with the main shaft chamber 111 and the fluid passage 210 is provided therethrough.

[0030] The valve core member 530 is movably installed in the valve passage 210 and is used to realize the opening or blocking of the valve passage 210.

[0031] The core spring 540 is accommodated in the valve passage 540, one end is abutted against the inside of the bidirectional piston 200, the other end is abutted against the valve core member 530, and biases the valve core member 530 to block the valve passage 520.

[0032] Specifically, in this embodiment, the opening or blocking of the valve passage 520 is realized by the movement of the valve core member 530. The installation of the core spring 540 ensures the accuracy of the movement of the valve core member 530. When a pressure difference occurs between the main shaft chamber 111 and the spring chamber 112 and the pressure in the main shaft chamber 111 exceeds the pressure in the spring chamber 112, the hydraulic oil pushes the valve core member 530, and the valve core member 530 moves in the valve passage 520 while overcoming the elastic force of the core spring 540, realizing the opening of the valve passage 520. After the pressure difference between the main shaft chamber 111 and the spring chamber 112 is balanced, the valve core member 530 is pushed by the elastic force of the core spring 540 to reset, moves in the valve passage 520, and blocks the valve passage 520. The state of the overload valve 500 automatically changes and has high reliability.

[0033] Other parts of this embodiment are the same as those of the first embodiment. For the features not described in this embodiment, the interpretation of the first embodiment is applied, and the description is omitted here.

[0034] (Third Embodiment) In the third embodiment of the present invention, as shown in FIG. 1, a first bearing cylinder 120 is installed at a position corresponding to the lower end of the transmission camshaft 300, and a position-limiting mounting seat 130 is installed at a position corresponding to the upper end of the transmission camshaft 300. A second bearing cylinder 140 is installed on the position-limiting mounting seat 130. The midpoints of the first bearing cylinder 120 and the second bearing cylinder 140 are located on the same axis. The transmission camshaft 300 is provided to penetrate through the first bearing cylinder 120 and the second bearing cylinder 140.

[0035] Specifically, in this embodiment, the main functions of the first bearing cylinder 120 and the second bearing cylinder 140 are to fix the transmission camshaft 300. When the transmission camshaft 300 rotates, the first bearing cylinder 120 and the second bearing cylinder 140 play a role in reducing vibration. In addition, they support the balance and stability of the transmission camshaft 300, reduce friction and wear, and can extend the service life of the transmission camshaft 300.

[0036] Other parts of this embodiment are the same as those of the first embodiment. For the features not described in this embodiment, the interpretation of the first embodiment is applied, and the description is omitted here.

[0037] (Fourth Embodiment) In the fourth embodiment of the present invention, as shown in FIG. 1, an outer peripheral seal ring 600 is installed between the outer end face of the position-limiting mounting seat 130 and the door closer housing 100. An inner peripheral seal ring 700 is installed between the inner end face of the position-limiting mounting seat 130 and the transmission camshaft 300.

[0038] Specifically, in this embodiment, on the one hand, the outer peripheral seal ring 600 always tightly abuts against the outer end face of the position-limiting mounting seat 130 and the door closer housing 100 respectively, and can seal the space between the position-limiting mounting seat 130 and the door closer housing 100. Therefore, the hydraulic oil in the inner cavity 110 is prevented from passing between the position-limiting mounting seat 130 and the door closer housing 100. On the other hand, the inner peripheral seal ring 700 always tightly abuts against the inner end face of the position-limiting mounting seat 130 and the transmission camshaft 300 respectively, and can seal the space between the position-limiting mounting seat 130 and the transmission camshaft 300. Therefore, the hydraulic oil in the inner cavity 110 is prevented from passing between the position-limiting mounting seat 130 and the transmission camshaft 300.

[0039] Other parts of this embodiment are the same as those of the third embodiment. For the features not described in this embodiment, the interpretation of the third embodiment is applied, and the description is omitted here.

[0040] (Fifth Embodiment) In the fifth embodiment of the present invention, as shown in FIGS. 1-2, the new cam hydraulic door closer further includes fixed mounting members 800. Two fixed mounting members 800 are provided. The two fixed mounting members 800 are provided symmetrically at both ends of the door closer housing 100. The fixed mounting members 800 and the door closer housing 100 are fixed by a plurality of fixing screws.

[0041] Specifically, in this embodiment, two fixed mounting members 800 are added to both ends of the door closer housing 100. Thereby, the installation and fixation of this new cam hydraulic door closer can be facilitated, the contact area between this new cam hydraulic door closer and the door body can be increased. Furthermore, the reliability and stability of the connection between this new cam hydraulic door closer and the door body can be enhanced, and the shaking can be suppressed.

[0042] Other parts of this embodiment are the same as those of the first embodiment. For features not described in this embodiment, the interpretation of the first embodiment shall be applied, and the description thereof is omitted here.

[0043] (Sixth Embodiment) In the sixth embodiment of the present invention, as shown in FIGS. 1 to 2, the fixed mounting member 800 is installed in an L shape and includes a door body connecting plate 810 and a housing connecting plate 820 that are integrally formed. The door body connecting plate 810 is installed horizontally and is fixed to the door body by a plurality of fixing screws. The housing connecting plate 820 is installed vertically and is fixed to the door closer housing 100 by a plurality of fixing screws.

[0044] Specifically, in this embodiment, the door body connecting plate 810 and the housing connecting plate 820 are integrally formed. Therefore, the fixed mounting member 800 has high overall structural strength, has safety and reliability during use, and can firmly connect and mount this new type of cam hydraulic door closer to the door body.

[0045] Other parts of this embodiment are the same as those of the fifth embodiment. For features not described in this embodiment, the interpretation of the fifth embodiment shall be applied, and the description thereof is omitted here.

[0046] (Seventh Embodiment) In the seventh embodiment of the present invention, as shown in FIGS. 1 to 2, lock holes 830 used for mounting fixing screws are provided through the door body connecting plate 810 and the housing connecting plate 820.

[0047] Specifically, in this embodiment, due to the lock holes 830 provided in advance in the door body connecting plate 810 and the housing connecting plate 820, there is no need to drill holes on site during installation. Therefore, this new type of cam hydraulic door closer can be quickly installed and locked with fixing screws.

[0048] Other parts of this embodiment are the same as those of the sixth embodiment. For features not described in this embodiment, the interpretation of the sixth embodiment is applied, and the description is omitted here.

[0049] (Eighth Embodiment) In the eighth embodiment of the present invention, as shown in FIG. 4, the door closer housing 100 includes a housing main body 150 and a sealed end cover 160.

[0050] The housing main body 150 has a hollow interior and both sides are open. The transmission camshaft 300 is rotatably connected to the housing main body.

[0051] There are two sealed end covers 160, which are respectively installed at the openings on both sides of the housing main body 150, and form an inner cavity 110 by surrounding each other. An end cover seal ring 170 is installed between the outer end face of the sealed end cover 160 and the housing main body 150.

[0052] Specifically, in this embodiment, the housing main body 150 and the two sealed end covers 160 in the door closer housing 100 are detachably connected. On the one hand, the operability of maintaining the whole new cam hydraulic door closer becomes extremely easy, and the operator can disassemble and maintain it quickly and conveniently. On the other hand, the detachable structure makes it easy to maintain or replace the single housing main body 150 or the sealed end cover 160, and the maintenance cost can be reduced.

[0053] Other parts of this embodiment are the same as those of the first embodiment. For features not described in this embodiment, the interpretation of the first embodiment is applied, and the description is omitted here.

[0054] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle scope of the present invention shall all be included within the protection scope of the present invention.

Description of Reference Numerals

[0055] 100 Door closer housing 110 Inner cavity body 111 Main shaft chamber 112 Spring chamber 120 First bearing cylinder 130 Position limit mounting seat 140 Second bearing cylinder 150 Housing body 160 Sealed end cover 170 End cover seal ring 200 Bi-directional piston 210 Fluid passage 300 Transmission camshaft 400 Driving spring 500 Overload valve 510 Valve body 520 Valve flow path 530 Valve core member 540 Core spring 600 Outer peripheral seal ring 700 Inner peripheral seal ring 800 Fixed mounting member 810 Door body connecting plate 820 Housing connecting plate 830 Lock hole

Claims

1. A new cam hydraulic door closer, The door closer includes a housing, a bidirectional piston, a transmission camshaft, and a drive spring. The door closer housing has an inner cavity filled with hydraulic oil along its axial direction, the inner cavity being provided inside the door closer housing, The bidirectional piston is movably disposed in the bore body and divides the bore body into a spindle chamber and a spring chamber. The transmission camshaft has an axial direction perpendicular to the extension direction of the door closer housing, is rotatably connected in the door closer housing, and is accommodated in the spindle chamber; the drive spring is accommodated in the spring chamber, and both ends of the drive spring are abutted against the bidirectional piston and the door closer housing, respectively, so that the bidirectional piston abuts against and presses against the transmission camshaft; The bidirectional piston has a fluid passage extending therethrough that communicates the spindle chamber and the spring chamber, and an overload valve is attached to the fluid passage. The overload valve is configured to allow the flow of hydraulic oil between the spindle chamber and the spring chamber when the pressure in the spindle chamber exceeds a predetermined threshold value. A new cam-operated hydraulic door closer featuring the following features:

2. The new cam hydraulic door closer according to claim 1, The overload valve includes a valve body, a valve core member, and a core spring. the valve body is mounted in the fluid passage, and a valve flow passage is formed therethrough, the valve flow passage communicating with the spindle chamber and the fluid passage, respectively; The valve core member is movably disposed in the valve flow passage and is used to open or close the valve flow passage; The core spring is housed in the valve flow passage, one end of the core spring abuts against the two-way piston, and the other end of the core spring abuts against the valve core member, and biases the valve core member to close the valve flow passage. A new cam-operated hydraulic door closer featuring the following features:

3. The new cam hydraulic door closer according to claim 1, The door closer housing has a first bearing sleeve installed at a position corresponding to a lower end of the transmission camshaft, a position limiting mounting seat installed at a position corresponding to an upper end of the transmission camshaft, a second bearing sleeve installed on the position limiting mounting seat, the midpoints of the first bearing sleeve and the second bearing sleeve are located on the same axis, and the transmission camshaft is provided to pass through the first bearing sleeve and the second bearing sleeve. A new cam-operated hydraulic door closer featuring the following features:

4. The new cam hydraulic door closer according to claim 3, An outer circumferential seal ring is installed between the outer end surface of the position limiting mounting seat and the door closer housing, and an inner circumferential seal ring is installed between the inner end surface of the position limiting mounting seat and the transmission camshaft. A new cam-operated hydraulic door closer featuring the following features:

5. The new cam hydraulic door closer according to claim 1, Further comprising a fixed mounting member; The fixed mounting members are provided in two parts, The two fixed mounting members are provided symmetrically on both ends of the door closer housing, and the fixed mounting members and the door closer housing are fixed by a plurality of fixing screws. A new cam-operated hydraulic door closer featuring the following features:

6. The new cam hydraulic door closer according to claim 5, The fixed mounting member is installed in an L-shape and includes a door body connecting plate and a housing connecting plate which are integrally formed, The door body connecting plate is horizontally installed and fixed to the door body by a plurality of fixing screws; The housing connecting plate is vertically installed and fixed to the door closer housing by a number of fixing screws. A new cam-operated hydraulic door closer featuring the following features:

7. The new cam hydraulic door closer according to claim 6, The door body connecting plate and the housing connecting plate are provided with lock holes for mounting fixing screws. A new cam-operated hydraulic door closer featuring the following features:

8. The new cam hydraulic door closer according to claim 1, The door closer housing includes a housing body and a sealed end cap; The housing body is hollow and has both sides open, and the transmission camshaft is rotatably connected to the housing body. The two sealed end caps are provided at the openings on both sides of the housing body, and are fitted together to form the inner cavity. An end cap seal ring is provided between the outer end surface of the sealed end cap and the housing body. A new cam-operated hydraulic door closer featuring the following features:

Images