Hydraulic buffering hidden hinge suitable for thin door installation

Abstract

The utility model discloses a hydraulic buffering hidden hinge suitable for installation of a thin door, which belongs to the technical field of door and window accessories and comprises a first installation seat, a second installation seat and a hydraulic shaft core module, and the hydraulic shaft core module is arranged on the first installation seat. The second mounting seat comprises a connecting plate, a joining plate and a hinging plate, the connecting plate is arranged at the first end of the joining plate, the second end of the joining plate is hinged to the hydraulic shaft core module, the first end of the hinging plate is hinged to the first end of the joining plate, the second end of the hinging plate is hinged to the first mounting seat, and the second end of the hinging plate is hinged to the second mounting seat. The connecting plate is used for being connected with a door leaf. The hydraulic buffering hidden hinge suitable for installation of the thin door solves the problems that a traditional hydraulic buffering hidden hinge is only suitable for a heavy door body, and glass door leaves or other thin door leaves cannot be used due to the fact that grooves cannot be formed in the traditional hydraulic buffering hidden hinge for installation of the glass door leaves or other thin door leaves.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window fittings, in particular to a hydraulic buffer hidden hinge suitable for the installation of thin doors. Background Art

[0002] The hydraulic buffer hidden hinge is a common hinge with a door closer function on the current market. In the existing hydraulic buffer hidden hinge, hydraulic shaft cores are arranged in both of the two mutually hinged mounting seats to achieve the function of hydraulic buffering. In order to have enough space to arrange the hydraulic shaft cores, the two mounting seats need to have enough thickness to accommodate the hydraulic shaft cores. Since the two mounting seats are relatively thick, during actual construction and installation, it is necessary to respectively groove the door frame and the door leaf, and then embed the two mounting seats into the grooves for fixation.

[0003] Therefore, this kind of hydraulic buffer hidden hinge is only suitable for relatively thick door bodies. For the installation of glass door leaves or other relatively thin door leaves, since grooving cannot be carried out, it cannot be used. Summary of the Utility Model

[0004] In order to overcome the defects existing in the prior art, the utility model provides a hydraulic buffer hidden hinge suitable for the installation of thin doors to solve the above problems.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a hydraulic buffer hidden hinge suitable for the installation of thin doors, including a first mounting seat, a second mounting seat and a hydraulic shaft core module, and the hydraulic shaft core module is arranged in the first mounting seat;

[0006] The second mounting seat includes a connecting plate, a connecting plate and a hinged plate. The connecting plate is arranged at the first end of the connecting plate. The second end of the connecting plate is hinged to the hydraulic shaft core module. The first end of the hinged plate is hinged to the first end of the connecting plate. The second end of the hinged plate is hinged to the first mounting seat. The connecting plate is used for connecting with the door leaf.

[0007] It should be noted that an avoidance cavity is formed in the middle of the connecting plate, and the hinged plate is movably arranged in the avoidance cavity.

[0008] Optionally, the hydraulic shaft core module includes a shaft housing and a transmission mechanism, a Y-shaped sealing ring, a one-way valve piston assembly and a regulating valve seat which are sequentially arranged in the shaft housing; the second end of the connecting plate is hinged to the shaft housing through a connecting seat;

[0009] The one-way valve piston assembly includes a piston rod and a piston head connected to each other; a first liquid storage cavity is formed between the piston head and the Y-shaped sealing ring, a second liquid storage cavity is formed between the piston head and the regulating valve seat, the piston rod is connected to the transmission mechanism, and the piston head is slidably connected to the inner wall of the shaft housing. When the shaft housing drives the transmission mechanism to rotate, the one-way valve piston assembly makes a linear reciprocating motion in the shaft housing to change the volumes of the first liquid storage cavity and the second liquid storage cavity.

[0010] Preferably, a spring is provided between the Y-shaped sealing ring and the transmission mechanism. The first end of the spring is connected to the Y-shaped sealing ring, the second end of the spring is connected to the transmission mechanism, and the piston rod passes through the Y-shaped sealing ring and the spring in sequence and then is connected to the transmission mechanism.

[0011] Specifically, the transmission mechanism includes a transmission shaft and a guiding kit. The first end of the transmission shaft is inserted into the first end of the guiding kit. The second end of the guiding kit is connected to the first mounting seat. A spiral guiding groove is formed in the first end of the guiding kit along the length direction of the guiding kit. A transmission pin is provided at the first end of the transmission shaft, and the transmission pin is slidably connected to the spiral guiding groove; the second end of the spring is connected to the second end of the transmission shaft, and the piston rod is connected to the second end of the transmission shaft;

[0012] A spline portion is formed on the circumferential wall surface of the transmission shaft and extends along the length direction of the transmission shaft. A spline ring is sleeved on the outer wall of the first end of the transmission shaft, and the spline ring is connected to the inner wall of the shaft housing. A spline groove is formed in the inner wall of the spline ring, and the spline groove meshes with the spline portion.

[0013] It should be noted that a compression spring is sleeved on the outer wall of the transmission shaft. The first end of the compression spring is connected to the spline ring, and the second end of the compression spring is connected to the second end of the transmission shaft.

[0014] Specifically, an oil passage is formed in the circumferential wall of the piston head. A valve core mounting hole communicating with the oil passage is provided on the side of the piston head away from the piston rod. A one-way valve is provided in the valve core mounting hole. A liquid inlet and outlet hole is formed in the one-way valve. A V-shaped groove is formed in the outer wall of the one-way valve. A valve body sealing ring is provided at one end of the one-way valve close to the piston head, and the valve body sealing ring is connected to the inner wall of the piston head.

[0015] The beneficial effects of the present utility model are as follows: In the hydraulic buffer hidden hinge applicable to thin door installation, since the hydraulic shaft core module does not need to be arranged at the position of the connecting plate, the connecting plate can be set to be flat during molding, and its thickness can be thinner than that of the first mounting seat. During construction and installation, only the door frame needs to be grooved, and the first mounting seat is embedded in the groove, while the connecting plate can be directly fixed to the side of the door leaf by a conventional fixing method such as screwing. In this way, it is not necessary to groove the door leaf for installation, so that the hydraulic buffer hidden hinge can be arranged in a glass door leaf or other relatively thin door leaves. Brief Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the hydraulic buffer hidden hinge applicable to thin door installation in an embodiment of the present utility model;

[0017] Figure 2 It is a schematic structural diagram of the cooperation of the embedded seat, the second mounting seat and the hydraulic shaft core module in an embodiment of the present utility model;

[0018] Figure 3 It is a schematic structural diagram of the cooperation of the embedded seat, the hinge plate and the hydraulic shaft core module in an embodiment of the present utility model;

[0019] Figure 4 It is a schematic structural diagram of the cooperation of the second mounting seat and the hydraulic shaft core module in an embodiment of the present utility model;

[0020] Figure 5 It is a schematic internal structure diagram of the hydraulic shaft core module in an embodiment of the present utility model;

[0021] Figure 6 It is an exploded view of the hydraulic shaft core module in an embodiment of the present utility model;

[0022] Figure 7 It is an exploded view of the one-way valve piston assembly in an embodiment of the present utility model;

[0023] Figure 8 It is a schematic structural diagram of the regulating valve core in an embodiment of the present utility model;

[0024] In the figure: 1 is the first mounting seat; 10 is the embedded seat; 2 is the second mounting seat; 20 is the connecting plate; 21 is the connecting plate; 22 is the hinge plate; 23 is the first rotating shaft; 24 is the avoidance cavity; 3 is the hydraulic shaft core module; 30 is the shaft housing; 301 is the connecting seat; 302 is the second rotating shaft; 31 is the one-way valve piston assembly; 311 is the piston rod; 312 is the one-way valve; 313 is the valve body sealing ring; 314 is the piston head; 315 is the oil passage; 316 is the valve core mounting hole; 317 is the liquid inlet and outlet hole; 318 is the V-shaped groove; 32 is the Y-shaped sealing ring; 321 is the spring; 33 is the regulating valve seat; 331 is the first liquid storage cavity; 332 is the second liquid storage cavity; 34 is the regulating valve core; 341 is the regulating rod; 342 is the regulating thread; 343 is the bearing; 344 is the regulating knob; 35 is the transmission shaft; 351 is the transmission pin; 352 is the spline portion; 353 is the compression spring; 36 is the guiding kit; 361 is the spiral guiding groove; 362 is the needle bearing; 363 is the shaft seat; 364 is the connecting section; 365 is the mounting wheel; 37 is the spline ring. Detailed implementation manners

[0025] The following further describes the detailed implementation manners of the present utility model with reference to the accompanying drawings. It should be noted here that the description of these implementation manners is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various implementation manners of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] As Figure 1-8 shown, a hydraulic buffer hidden hinge suitable for thin door installation includes a first mounting seat 1, a second mounting seat 2 and a hydraulic shaft core module 3, and the hydraulic shaft core module 3 is arranged on the first mounting seat 1;

[0027] The second mounting seat 2 includes a connecting plate 20, a connecting plate 21 and a hinge plate 22. The connecting plate 20 is arranged at the first end of the connecting plate 21. Specifically, the connecting plate 20 is detachably connected to the first end of the connecting plate 21 by screwing with a screw. The second end of the connecting plate 21 is hinged to the hydraulic shaft core module 3 through a second rotating shaft 302. The first end of the hinge plate 22 is hinged to the first end of the connecting plate 21 through a first rotating shaft 23. The second end of the hinge plate 22 is hinged to the first mounting seat 1. The connecting plate 20 is used to connect to the door leaf. In this embodiment, the connecting plate 20 is provided with a first long hole, and the screw passes through the first long hole to realize the connection between the connecting plate 20 and the door leaf. By setting the first long hole, the relative position between the connecting plate 20 and the door leaf can be adjusted.

[0028] In the hydraulic buffer concealed hinge applicable to thin door installation, since the hydraulic shaft core module 3 does not need to be set at the position of the connecting plate 20, the connecting plate 20 can be set to be flat during molding, and its thickness can be thinner than that of the first mounting seat 1. During construction and installation, only the door frame needs to be grooved, and the first mounting seat 1 can be embedded into the groove, while the connecting plate 20 can be directly fixed to the side of the door leaf by conventional fixing methods such as screwing. In this way, it is not necessary to groove the door leaf for installation, so that the hydraulic buffer concealed hinge can be set in a glass door leaf or other relatively thin door leaves.

[0029] As Figure 1-4 shown, in this embodiment, an embedded seat 10 is provided in the first mounting seat 1. Specifically, the embedded seat 10 is provided with a second long hole, and the screw passes through the second long hole to realize the connection between the embedded seat 10 and the first mounting seat 1. By setting the second long hole, the relative position between the embedded seat 10 and the first mounting seat can be adjusted; the hydraulic shaft core module 3 is rotatably connected to the embedded seat 10, and the second end of the hinge plate 22 is hinged to the embedded seat 10. During use, the door leaf drives the connecting plate 20 to move, and the connecting plate 20 can rotate through the cooperation of the connecting plate 21 and the hinge plate 22 to achieve the purpose of pushing the hydraulic shaft core module 3, so that the hydraulic shaft core module 3 rotates in the embedded seat 10 in the first mounting seat 1, realizing the swing of the door leaf relative to the door frame. At this time, the hydraulic shaft core module 3 can also store energy, so that when closing the door, the energy can be released through the hydraulic shaft core module 3 to realize the function of hydraulic buffer, and the door leaf can be automatically and slowly closed.

[0030] Preferably, an avoidance cavity 24 is formed in the middle of the connecting plate 21, and the hinge plate 22 is movably arranged in the avoidance cavity 24. By setting the avoidance cavity 24, when the connecting plate 21 and the hinge plate 22 rotate in cooperation, the hinge plate 22 has enough space to move.

[0031] It should be noted that, as Figure 5 and 6 shown, the hydraulic shaft core module 3 includes a shaft shell 30 and a transmission mechanism, a Y-shaped sealing ring 32, a one-way valve piston assembly 31 and a regulating valve seat 33 which are sequentially arranged in the shaft shell 30; the second end of the connecting plate is hinged to the shaft shell 30 through a connecting seat 301;

[0032] The one-way valve piston assembly 31 includes a piston rod 311 and a piston head 314 connected to each other. A first liquid storage cavity 331 is formed between the piston head 314 and the Y-shaped sealing ring 32, and a second liquid storage cavity 332 is formed between the piston head 314 and the regulating valve seat 33. The piston rod 311 passes through the Y-shaped sealing ring 32 and is connected to the transmission mechanism. The piston head 314 is slidably connected to the inner wall of the shaft housing 30. The transmission mechanism is connected to the first mounting seat 1. When the shaft housing 30 drives the transmission mechanism to rotate, the one-way valve piston assembly 31 makes a linear reciprocating motion within the shaft housing 30 to change the volumes of the first liquid storage cavity 331 and the second liquid storage cavity 332.

[0033] The second end of the connecting plate drives the shaft housing 30 to rotate through the connecting seat 301, and the shaft housing 30 drives the transmission mechanism to rotate, so that the one-way valve piston assembly 31 can make a linear reciprocating motion within the shaft housing 30, realizing the opening and closing of the hinge.

[0034] Specifically, a spring 321 is provided between the Y-shaped sealing ring 32 and the transmission mechanism. The first end of the spring 321 is connected to the Y-shaped sealing ring 32, the second end of the spring 321 is connected to the transmission mechanism, and the piston rod 311 passes through the Y-shaped sealing ring 32 and the spring 321 in sequence and then is connected to the transmission mechanism.

[0035] When the traditional hydraulic buffer hidden hinge is fixed, it needs to be installed according to the arrow direction marked on the hydraulic shaft core so that the internal hydraulic oil can flow back by its own gravity. Therefore, if the traditional hydraulic buffer hidden hinge is installed reversely, it will directly cause the hydraulic buffer function to fail. In this embodiment, the spring 321 pushes the Y-shaped sealing ring 32, so that the Y-shaped sealing ring 32 can move within the first liquid storage cavity 331, and the hinge does not need to be installed in a specified direction, so that the hydraulic oil does not need to flow under the action of load or its own weight, preventing the buffer effect from failing.

[0036] In the open door state, the spring 321 pushes the Y-shaped sealing ring 32 towards the piston head 314 and makes the Y-shaped sealing ring 32 contact the piston head 314. The spring 321 and the hydraulic oil in the first liquid storage cavity 331 cooperate to push the Y-shaped sealing ring 32, so that the Y-shaped sealing ring 32 can move within the first liquid storage cavity 331. The specific principle is that when the thrust provided by the hydraulic pressure in the first liquid storage cavity 331 is greater than the spring force of the spring 321, the Y-shaped sealing ring 32 moves towards the direction of the spring 321. When the thrust provided by the hydraulic pressure in the first liquid storage cavity 331 is less than the spring force of the spring 321, the Y-shaped sealing ring 32 moves towards the direction of the piston head 314. In this way, the hinge does not need to be installed in a specified direction, so that the hydraulic oil does not need to flow under the action of load or its own weight, preventing the buffer effect from failing.

[0037] After the first liquid storage cavity 331 is filled with hydraulic oil in this embodiment, the Y-shaped sealing ring 32 will also be expanded, making the sealing performance better and preventing the hydraulic oil from seeping into one side of the spring 321 and affecting the buffering effect. At the same time, a rigid sealing ring base is provided at one end of the Y-shaped sealing ring 32 close to the spring 321, and the spring 321 is pressed against the sealing ring base to prevent the Y-shaped sealing ring 32 from deforming during movement.

[0038] Optionally, the transmission mechanism includes a transmission shaft 35 and a guide kit 36. The first end of the transmission shaft 35 is inserted into the first end of the guide kit 36. The second end of the guide kit 36 is connected to the first mounting seat 1. A spiral guide groove 361 is provided along the length direction of the first end of the guide kit 36. A transmission pin 351 is provided at the first end of the transmission shaft 35, and the transmission pin 351 is slidably connected to the spiral guide groove 361; the second end of the spring 321 is connected to the second end of the transmission shaft 35, and the piston rod 311 sequentially passes through the Y-shaped sealing ring 32 and the spring 321 and then is connected to the second end of the transmission shaft 35;

[0039] A spline portion 352 is provided on the circumferential wall surface of the transmission shaft 35, and the spline portion 352 extends along the length direction of the transmission shaft 35. A spline ring 37 is sleeved on the outer wall of the first end of the transmission shaft 35, and the spline ring 37 is connected to the inner wall of the shaft housing 30. A spline groove is provided on the inner wall of the spline ring 37, and the spline groove meshes with the spline portion 352. So that the spline ring 37 can drive the transmission shaft 35 to rotate about the central axis of the transmission shaft 35 itself, and can make the spline ring 37 and the transmission shaft 35 perform relative linear motion in the length direction of the transmission shaft.

[0040] When the shaft housing 30 rotates, it drives the spline ring 37 to rotate, and drives the transmission shaft 35 to rotate through the spline ring 37, so that the spline ring 37 rotates relative to the guide kit 36, causing the transmission shaft 35 to move under the action of the spiral guide groove 361 and the transmission pin 351, and thus can drive the one-way valve piston assembly 31 to move.

[0041] In this embodiment, the guide kit 36 and the spline ring 37 are connected by balls, and the outer wall of the spline ring 37 is closely attached to the inner wall of the shaft housing 30; when the transmission shaft 35 moves, it can move within the spline ring 37, and at the same time prevent the spline ring 37 and the guide kit 36 from rotating synchronously, resulting in the failure of the transmission shaft 35 to move, and the structure is more stable.

[0042] One end of the guiding kit 36 is provided with a needle bearing 362. The needle bearing 362 is inserted into a shaft seat 363. The shaft seat 363 is installed in a shaft housing 30. One end of the guiding kit 36 is provided with a connecting section 364. The connecting section 364 is in the shape of a flat cylinder. An installation wheel 365 is sleeved on the connecting section 364. The inner hole of the installation wheel 365 is in a flat circular shape and is sleeved on the connecting section 364. The outer circle of the installation wheel 365 is in the shape of pointed teeth and is sleeved in an embedded seat 10 of the first mounting seat 1.

[0043] It should be noted that a compression spring 353 is sleeved on the outer wall of the transmission shaft 35. The first end of the compression spring 353 is connected to the spline ring 37. The second end of the compression spring 353 is connected to the second end of the transmission shaft 35.

[0044] When the spline ring 37 rotates, the transmission shaft 35 rotates accordingly. The transmission pin 351 moves in the spiral guide groove 361, so that the transmission shaft 35 moves. Since the compression spring 353 is located between the spline ring 37 and the second end of the transmission shaft 35, the spline ring 37 is always pressed against the guiding kit 36. When the transmission shaft 35 moves towards the guiding kit 36, the compression spring 353 is compressed to store energy. The space of the first liquid storage cavity 331 decreases, and the space of the second liquid storage cavity 332 increases. At this time, it is the process of the hinge opening. When the transmission shaft 35 moves in the direction opposite to the guiding kit 36, the compression spring 353 releases and resets. The first liquid storage cavity 331 becomes larger, and the space of the second liquid storage cavity 332 becomes smaller. At this time, the hinge is in the closing process. Moreover, under the action of the one-way valve piston assembly 31, the hydraulic oil flows slowly, thus playing a buffering role.

[0045] Preferably, as Figure 7 shown, an oil passage 315 is formed in the circumferential wall of the piston head 314. A valve core mounting hole 316 communicating with the oil passage 315 is provided on the side of the piston head 314 away from the piston rod 311. A one-way valve 312 is arranged in the valve core mounting hole 316. A liquid inlet and outlet hole 317 is formed in the one-way valve 312. A V-shaped groove 318 is formed in the outer wall of the one-way valve 312. A valve body sealing ring 313 is arranged at one end of the one-way valve 312 close to the piston head 314. The valve body sealing ring 313 is connected to the inner wall of the piston head 314.

[0046] During the opening process of the hinge, the space of the first liquid storage cavity 331 shrinks, and the hydraulic oil in the first liquid storage cavity 331 enters through the oil passage 315, then presses against the one-way valve 312, causing the one-way valve 312 to move away from the valve body seal ring 313. The hydraulic oil can then quickly output from the V-shaped groove 318 and the liquid inlet and outlet hole 317 into the second liquid storage cavity 332. When the hydraulic oil in the first liquid storage cavity 331 decreases, the Y-shaped seal ring 32 automatically presses against the piston head 314 by the spring 321, thus completing the flow conversion of the hydraulic oil. The hinge does not need to be installed in a specified direction, preventing the buffer function from failing. During the closing process of the hinge, the space of the first liquid storage cavity 331 becomes larger, and the space of the second liquid storage cavity 332 gradually becomes smaller. The hydraulic oil presses against the one-way valve 312, causing the one-way valve 312 to press against the valve body seal ring 313 and seal one end of the V-shaped groove 318, so that the hydraulic oil can only slowly enter the first liquid storage cavity 331 from the liquid inlet and outlet hole 317. Under the action of the compression spring 353 and the spring 321, the buffering effect is better.

[0047] Specifically, as Figure 8 shown, the hydraulic shaft core module 3 further includes a regulating valve core 34. The regulating valve core 34 sequentially passes through the liquid inlet and outlet hole 317 and the valve core installation hole 316, so that the one-way valve 312 reciprocates along the length direction of the regulating valve core 34 in the valve core installation hole 316.

[0048] The regulating valve core 34 of this embodiment is a conical core body. One end of the regulating valve core 34 far from the liquid inlet and outlet hole 317 is connected with an adjusting rod 341. The adjusting rod 341 is provided with adjusting threads 342. An adjusting valve seat 33 is installed on the adjusting rod 341 through the adjusting threads 342. The adjusting valve seat 33 is installed in the shaft housing 30. The adjusting valve seat 33 extends to the end of the shaft housing 30 and is sleeved with a bearing 343. The bearing 343 is installed in the embedded seat 10 of the first mounting seat 1. The adjusting rod 341 is also connected with an adjusting knob 344 located outside the embedded seat 10. The flow rate of the liquid inlet and outlet hole 317 can be adjusted by the regulating valve core 34 in the shape of a conical core body. During adjustment, the adjusting knob 344 can be used to drive the regulating valve core 34 to adjust its position in the liquid inlet and outlet hole 317, so as to change the taper of the regulating valve core 34 in the liquid inlet and outlet hole 317. It is also worth noting that the diameter of the conical core body of this embodiment decreases from the adjusting rod 341 to the direction of the liquid inlet and outlet hole 317; so as to facilitate adjusting the flow rate of the liquid inlet and outlet hole 317 by the adjusting knob 344.

[0049] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A hydraulic buffer hidden hinge applicable to thin door installation, characterized in that: It includes a first mounting seat, a second mounting seat and a hydraulic core module, and the hydraulic core module is arranged on the first mounting seat; The second mounting seat includes a connecting plate, an adapter plate and a hinged plate. The connecting plate is arranged at the first end of the adapter plate. The second end of the adapter plate is hinged to the hydraulic core module. The first end of the hinged plate is hinged to the first end of the adapter plate. The second end of the hinged plate is hinged to the first mounting seat. The connecting plate is used for connecting with a door leaf.

2. The hydraulic buffer hidden hinge applicable to thin door installation according to claim 1, wherein: A relief cavity is formed in the middle of the adapter plate, and the hinged plate is movably arranged in the relief cavity.

3. A hydraulic buffer hidden hinge applicable to thin door installation according to claim 1, characterized in that: The hydraulic core module includes a shaft housing and a transmission mechanism, a Y-shaped sealing ring, a check valve piston assembly and a regulating valve seat which are sequentially arranged in the shaft housing. The second end of the adapter plate is hinged to the shaft housing through a connecting seat; The check valve piston assembly includes a piston rod and a piston head which are connected. A first liquid storage cavity is formed between the piston head and the Y-shaped sealing ring. A second liquid storage cavity is formed between the piston head and the regulating valve seat. The piston rod is connected to the transmission mechanism. The piston head is slidably connected to the inner wall of the shaft housing. When the shaft housing drives the transmission mechanism to rotate, the check valve piston assembly makes a linear reciprocating motion in the shaft housing to change the volumes of the first liquid storage cavity and the second liquid storage cavity.

4. The hydraulic buffer concealed hinge applicable to thin door installation according to claim 3, characterized in that: A spring is arranged between the Y-shaped sealing ring and the transmission mechanism. The first end of the spring is connected to the Y-shaped sealing ring, and the second end of the spring is connected to the transmission mechanism. The piston rod passes through the Y-shaped sealing ring and the spring in sequence and then is connected to the transmission mechanism.

5. The hydraulic buffer hidden hinge applicable to thin door installation according to claim 4, wherein: The transmission mechanism includes a transmission shaft and a guiding sleeve. The first end of the transmission shaft is inserted into the first end of the guiding sleeve. The second end of the guiding sleeve is connected to the first mounting seat. A spiral guiding groove is formed in the first end of the guiding sleeve along the length direction of the guiding sleeve. A transmission pin is arranged at the first end of the transmission shaft. The transmission pin is slidably connected to the spiral guiding groove. The second end of the spring is connected to the second end of the transmission shaft. The piston rod is connected to the second end of the transmission shaft; A spline portion is formed on the circumferential wall surface of the transmission shaft and extends along the length direction of the transmission shaft. A spline ring is sleeved on the outer wall of the first end of the transmission shaft. The spline ring is connected to the inner wall of the shaft housing. A spline groove is formed in the inner wall of the spline ring and meshes with the spline portion.

6. The hydraulic buffer hidden hinge applicable to thin door installation according to claim 5, wherein: A compression spring is sleeved on the outer wall of the transmission shaft. The first end of the compression spring is connected to the spline ring, and the second end of the compression spring is connected to the second end of the transmission shaft.

7. A hydraulic buffer hidden hinge suitable for thin door installation according to claim 3, characterized in that: An oil passage is formed in the circumferential wall of the piston head. A valve core mounting hole communicated with the oil passage is arranged on the side of the piston head far away from the piston rod. A check valve is arranged in the valve core mounting hole. A liquid inlet and outlet hole is formed in the check valve. A V-shaped groove is formed in the outer wall of the check valve. A valve body sealing ring is arranged at the end of the check valve close to the piston head. The valve body sealing ring is connected to the inner wall of the piston head.

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