New cam 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 households. Door closers have many applications, and among them, the most important application is to close the door to limit the spread of fire and ventilation in the building.

[0003] The basic composition of a hydraulic door closer includes 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 play a role in fixing the door closer and connecting 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. In 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 releases the accumulated elastic energy because it was compressed during the opening process, 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 drawbacks 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 objective of the present invention is to provide a novel cam-type hydraulic door closer, thereby solving the technical problems of conventional door closers, which are characterized by complex construction, low production efficiency, high failure rate, and unstable performance. [Means for solving the problem]

[0006] To achieve the above objectives, the novel cam hydraulic door closer according to an embodiment of the present invention comprises a door closer housing, a bidirectional piston, a transmission camshaft, and a drive spring. The door closer housing has an internal cavity filled with hydraulic fluid along its axial direction. The bidirectional piston is movably mounted within the lumen, dividing the lumen 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 to the door closer housing, and is housed in the main shaft chamber. The drive spring is housed in the spring chamber, with both ends in contact with the bidirectional piston and the door closer housing, respectively, so that the bidirectional piston contacts and presses against the transmission camshaft. The bidirectional piston has a fluid passage through which the main shaft chamber and the spring chamber are connected, and an overload valve is attached to the fluid passage. B The device is configured to allow the flow of hydraulic fluid between the spindle chamber and the spring chamber when the pressure inside the spindle chamber exceeds a predetermined threshold.

[0007] Preferably, the overload valve B It comprises a valve body, a valve core component, and a core spring. The valve body is installed in the fluid passage, and valve passages are provided through it, communicating with the main shaft chamber and the fluid passage, respectively. The valve core member is movably installed within the valve flow path and is used to open or close the valve flow path. The core spring is housed within the valve passage, with one end in contact with the bidirectional piston and the other end in contact with the valve core member, thereby biasing the valve core member to block the valve passage.

[0008] Preferably, the door closer housing has a first bearing cylinder installed at a position corresponding to the lower end of the transmission camshaft, a position limiting mounting seat installed at a position corresponding to the upper end of the transmission camshaft, a second bearing cylinder 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 passing through the first bearing cylinder and the second bearing cylinder.

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

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

[0011] Preferably, the fixing mounting member is installed in an L-shape and comprises 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 multiple fixing screws. The housing connecting plate is installed vertically and is fixed to the door closer housing by a number of fixing screws.

[0012] Preferably, the door body connecting plate and the housing connecting plate are provided with locking holes used for attaching fixing screws.

[0013] Preferably, the door closer housing comprises a housing body and a sealing end cover. The housing body is hollow inside, has openings on both sides, and the transmission camshaft is rotatably connected to the housing body. The sealing end caps consist of two parts, each installed in an opening on either side of the housing body, and by enclosing each other, they form the inner cavity. An end cap seal ring is installed between the outer end surface of the sealing end cap and the housing body.

[0014] The above-described means of the eccentric cam door closer for glass doors according to the present invention have at least one of the following technical effects. This new cam hydraulic door closer eliminates the gear and rack structure, greatly simplifying the structure and volume of the door closer. The bidirectional piston always flexibly contacts the outer surface of the transmission camshaft via the drive spring. When the transmission camshaft is operated, the bidirectional pistons work together, compressing the drive spring and allowing the drive spring to store force. At the same time, the overload valve B This enables the flow of hydraulic fluid between the main shaft chamber and the spring chamber. Therefore, when the transmission camshaft rotates within the door closer housing, the bidirectional pistons receive a damping effect on the transmission camshaft and the hydraulic fluid. As a result, the instantaneous speed when the door is closed is reduced, and sufficient cushioning is provided by this new cam hydraulic door closer when the door is closed. Thus, the new cam hydraulic door closer of the present invention has the advantages of a 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 description of the embodiments or the prior art will be briefly described below. It is clear 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] It is a schematic diagram showing the internal structure of a new type of cam hydraulic door closer according to an embodiment of the present invention. [Figure 2] It is a schematic diagram showing the exploded structure of a new type of cam hydraulic door closer according to an embodiment of the present invention. [Figure 3] It is a schematic diagram showing the connection of a bidirectional piston and an overload valve according to an embodiment of the present invention. [Figure 4] It is a schematic diagram showing the internal structure of a door closer housing according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0017] The embodiments of the present invention will be described in detail below. 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 exemplary 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", "inner", "outer", 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, so it 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 the number of technical features. Therefore, the features defined as "first" and "second" 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.

[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. For example, it may be fixedly connected, removably connected, integrated, mechanically connected or electrically connected, directly connected or indirectly connected through an intermediate medium, or may be internal communication between two members or interaction between two members. Those 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 its axial direction perpendicular to the extension direction of the door closer housing 100, is rotatably connected to the door closer housing 100, and is housed in the main shaft chamber 111.

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

[0026] A fluid passage 210 is provided through the bidirectional piston 200, connecting the main shaft chamber 111 and the spring chamber 112. An overload valve 500 is installed in the fluid passage 210. B The 500 is configured to allow the flow of hydraulic fluid between the spindle chamber 111 and the spring chamber 112 when the pressure inside the spindle chamber 111 exceeds a predetermined threshold.

[0027] Specifically, in this embodiment, the eccentric hydraulic door closer omits the gear and rack structure, significantly simplifying the structure and volume of the door closer. The bidirectional piston 200 always flexibly contacts the outer surface of the transmission camshaft 300 via the drive spring 400. When the transmission camshaft 300 is operated, the bidirectional piston 200 moves in conjunction, compressing the drive spring 400, which stores force. At the same time, the overload valve... B The 500 enables the flow of hydraulic fluid between the main shaft chamber 111 and the spring chamber 112. Therefore, when the transmission camshaft 300 rotates within the door closer housing 100, the bidirectional piston 200 receives a damping effect on the transmission camshaft 300 and a damping effect on the hydraulic fluid. As a result, the instantaneous speed when the door is closed is reduced, and sufficient cushioning is provided by this eccentric hydraulic door closer when the door is closed. Thus, the eccentric hydraulic door closer of the present invention has the advantages of a simple structure, easy assembly, high production efficiency, low failure rate, and stable performance.

[0028] (Second embodiment) In a second embodiment of the present invention, as shown in Figure 3, the overload valve B The 500 comprises 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 valve passages 520 are provided through it, communicating with the main shaft chamber 111 and the fluid passage 210, respectively.

[0030] The valve core member 530 is movably installed within the valve passage 210 and is used to open or close the valve passage 210.

[0031] The core spring 540 is housed within the valve passage 540, with one end in contact with the bidirectional piston 200 and the other end in contact with the valve core member 530, thereby biasing the valve core member 530 to block the valve passage 520.

[0032] Specifically, in this embodiment, the opening or closing of the valve passage 520 is achieved 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 spindle chamber 111 and the spring chamber 112, and the pressure in the spindle chamber 111 exceeds the pressure in the spring chamber 112, the hydraulic fluid pushes the valve core member 530, causing the valve core member 530 to move through the valve passage 520 while overcoming the elastic force of the core spring 540, thereby opening the valve passage 520. After the pressure difference between the spindle chamber 111 and the spring chamber 112 is balanced, the valve core member 530 is returned to its original position by the core spring 540. Pushed by the elastic force, it moves through the valve passage 520 and blocks the valve passage 520. Overload valve B The 500 status changes automatically and is highly reliable.

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

[0034] (Third embodiment) In a third embodiment of the present invention, as shown in Figure 1, the door closer housing 100 has a first bearing cylinder 120 installed at a position corresponding to the lower end of the transmission camshaft 300, a position limiting mounting seat 130 installed at a position corresponding to the upper end of the transmission camshaft 300, and a second bearing cylinder 140 installed on the position limiting mounting seat 130. The midpoints of the first bearing cylinder 120 and the second bearing cylinder 140 lie on the same axis. The transmission camshaft 300 is provided passing through the first bearing cylinder 120 and the second bearing cylinder 140.

[0035] Specifically, in this embodiment, the main function of the first bearing cylinder 120 and the second bearing cylinder 140 is to fix the transmission camshaft 300. The first bearing cylinder 120 and the second bearing cylinder 140 play a role in reducing vibration when the transmission camshaft 300 rotates. They also support the maintenance of balance and stability of the transmission camshaft 300, reduce friction and wear, and extend the life of the transmission camshaft 300.

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

[0037] (Fourth embodiment) In the fourth embodiment of the present invention, as shown in Figure 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 seal ring 600 always tightly contacts the outer end face of the position limiting mounting seat 130 and the door closer housing 100, respectively, thereby sealing the space between the position limiting mounting seat 130 and the door closer housing 100. This prevents the hydraulic fluid in the inner cavity 110 from passing between the position limiting mounting seat 130 and the door closer housing 100. On the other hand, the inner seal ring 700 always tightly contacts the inner end face of the position limiting mounting seat 130 and the transmission camshaft 300, respectively, thereby sealing the space between the position limiting mounting seat 130 and the transmission camshaft 300. This prevents the hydraulic fluid in the inner cavity 110 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, and for features not described in this embodiment, the interpretation of the third embodiment applies, and their description is omitted here.

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

[0041] Specifically, in this embodiment, two additional fixing members 800 are provided at both ends of the door closer housing 100. This makes it easier to install and fix the new cam hydraulic door closer and increases the contact area between the new cam hydraulic door closer and the door body. Furthermore, it improves the reliability and stability of the linkage between the new cam hydraulic door closer and the door body, thereby suppressing vibrations.

[0042] Other parts of this embodiment are the same as those of the first embodiment, and for features not described in this embodiment, the interpretation of the first embodiment applies, and their description is omitted here.

[0043] (Sixth Embodiment) In the sixth embodiment of the present invention, as shown in Figures 1 and 2, the fixing mounting member 800 is installed in an L-shape and comprises an integrally formed door body connecting plate 810 and housing connecting plate 820. The door body connecting plate 810 is installed horizontally and fixed to the door body by a plurality of fixing screws. The housing connecting plate 820 is installed vertically and 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 fixing mounting member 800 has high overall structural strength, is safe and reliable during use, and can securely link and mount this new cam hydraulic door closer to the door body.

[0045] Other parts of this embodiment are the same as those of the fifth embodiment, and for features not described in this embodiment, the interpretation of the fifth embodiment applies, and their description is omitted here.

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

[0047] Specifically, in this embodiment, the locking holes 830 pre-provided in the door body connecting plate 810 and the housing connecting plate 820 eliminate the need to drill holes on-site during installation. Therefore, this new cam hydraulic door closer can be quickly installed and locked using fixing screws.

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

[0049] (Eighth embodiment) In the eighth embodiment of the present invention, as shown in Figure 4, the door closer housing 100 comprises a housing body 150 and a sealing end cover 160.

[0050] The housing body 150 is hollow inside and open on both sides. The transmission camshaft 300 is rotatably connected to the housing body.

[0051] There are two sealing end covers 160, each installed in the openings on both sides of the housing body 150, and they surround each other to form an internal cavity 110. An end cover seal ring 170 is installed between the outer end face of the sealing end cover 160 and the housing body 150.

[0052] Specifically, in this embodiment, the housing body 150 and the two sealing end covers 160 in the door closer housing 100 are detachably connected. On the one hand, the overall operation of the new cam hydraulic door closer becomes extremely easy, and workers can quickly and conveniently disassemble and maintain it. On the other hand, the removable structure makes it easy to maintain or replace the individual housing body 150 or sealing end covers 160, thereby reducing maintenance costs.

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

[0054] The foregoing describes only preferred embodiments of the present invention and does not limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention are all included within the scope of protection of the present invention. [Explanation of symbols]

[0055] 100 Door Closer Housing 110 Luminal body 111 Spindle room 112 Spring chamber 120 First bearing cylinder 130 Position restriction mounting base 140 Second bearing cylinder 150 Housing Body 160 Sealed end lid 170 End cap sealing ring 200 Bidirectional Piston 210 Fluid passage 300 Transmission Camshaft 400 drive spring 500 Overload Valve 510 Valve body 520 Valve flow path 530 Valve core component 540 Core Spring 600 Outer circumference sealing ring 700 Inner Circumference Seal Ring 800 Fixing mounting components 810 Door body connecting plate 820 Housing connecting plate 830 lock holes

Claims

1. It is a new type of cam hydraulic door closer, It comprises a door closer housing, a bidirectional piston, a transmission camshaft, and a drive spring. The door closer housing has an internal cavity filled with hydraulic fluid along its axial direction, The bidirectional piston is movably mounted within the lumen, and the lumen is divided 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 to the door closer housing, and is housed in the main shaft chamber. The drive spring is housed in the spring chamber, with both ends in contact with the bidirectional piston and the door closer housing, respectively, so that the bidirectional piston contacts and presses against the transmission camshaft. The bidirectional piston has a fluid passage connecting the main shaft chamber and the spring chamber, and an overload valve is installed in the fluid passage. The overload valve is configured to allow the flow of hydraulic fluid between the main shaft chamber and the spring chamber when the pressure in the main shaft chamber exceeds a predetermined threshold. Further equipped with fixing and mounting members, The aforementioned fixing mounting member is installed in two parts. The two aforementioned mounting members are provided symmetrically at both ends of the door closer housing, and the mounting members and the door closer housing are fixed together by a plurality of fixing screws. The aforementioned fixing 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 aforementioned door body connecting plate is installed horizontally and is fixed to the door body by multiple fixing screws. The housing connecting plate is installed vertically and is fixed to the door closer housing by a plurality of fixing screws. A new type of cam-type hydraulic door closer characterized by its features.

2. A new type of cam hydraulic door closer according to claim 1, The overload valve comprises a valve body, a valve core member, and a core spring. The valve body is installed in the fluid passage, and valve passages are provided through it, communicating with the main shaft chamber and the fluid passage, respectively. The valve core member is movably installed within the valve passage and is used to open or close the valve passage. The core spring is housed within the valve passage, with one end in contact with the bidirectional piston and the other end in contact with the valve core member, thereby biasing the valve core member to block the valve passage. A new type of cam-type hydraulic door closer characterized by its features.

3. A new type of cam hydraulic door closer according to claim 1, The door closer housing has a first bearing cylinder installed at a position corresponding to the lower end of the transmission camshaft, a position limiting mounting seat installed at a position corresponding to the upper end of the transmission camshaft, a second bearing cylinder 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 passing through the first bearing cylinder and the second bearing cylinder. A new type of cam-type hydraulic door closer characterized by its features.

4. A new type of cam hydraulic door closer according to claim 3, An outer circumferential sealing ring is installed between the outer end face of the position limiting mounting seat and the door closer housing, and an inner circumferential sealing ring is installed between the inner end face of the position limiting mounting seat and the transmission camshaft. A new type of cam-type hydraulic door closer characterized by its features.

5. A new type of cam hydraulic door closer according to claim 1, The door body connecting plate and the housing connecting plate are provided with locking holes used for attaching fixing screws. A new type of cam-type hydraulic door closer characterized by its features.

6. A new type of cam hydraulic door closer according to claim 1, The door closer housing comprises a housing body and a sealed end cover. The housing body is hollow inside, has openings on both sides, and the transmission camshaft is rotatably connected to the housing body. The aforementioned sealing end caps consist of two parts, each installed in the openings on both sides of the housing body, and by enclosing each other, they form the inner cavity, with an end cap seal ring installed between the outer end surface of the sealing end cap and the housing body. A new type of cam-type hydraulic door closer characterized by its features.

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