High-pressure-resistant sealing device

Abstract

The utility model discloses a high-pressure-resistant sealing device which comprises an oil cylinder head, a through hole, a piston column, an oil scraping ring, a rubber sealing ring, an oil sealing structure and a dustproof sealing ring. An oil injection one-way valve and a pressure sensor are connected to the outer side of an oil injection hole connected with an oil tank, the pressure sensor is used for detecting the pressure in the oil tank, a pressure adjusting structure is arranged at the top of a movable U-shaped sealing ring and supports the top of the movable U-shaped sealing ring, and the pressure of the movable U-shaped sealing ring is adjusted by rotating a rotating ring of the pressure adjusting structure. The internal thread ring moves downwards to increase the pressure of the spring, the movable U-shaped sealing ring is pressed downwards through the spring, the internal pressure of the oil liquid groove is increased, the effect of adjusting the internal pressure of the oil liquid groove is achieved, the internal pressure of the oil liquid groove is too large, buffering is conducted by extruding the spring, the oil leakage phenomenon of the oil liquid groove is effectively reduced, and the internal pressure of the oil liquid groove can be released in time.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, specifically a high-pressure resistant sealing device. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] In hydraulic cylinders, oil seals are generally used between the cylinder and the piston rod to ensure the sealing of the cylinder interior. Currently, Chinese utility model patent CN218062896U discloses "A Double Oil Seal Hydraulic Cylinder for an Oil Seal Vulcanizing Machine", which includes a cylinder body with an internal cavity. A first slot is fixedly provided at the upper opening of the cylinder body, and a first oil seal ring is provided at the lower end of the first slot. A second slot is fixedly provided inside the cylinder body and at the lower end of the first slot, and a second oil seal ring is provided inside the second slot. An oil groove is formed between the first oil seal ring and the second oil seal ring. Sliding grooves are fixedly provided at both the upper and lower ends of the first and second slots inside the cylinder body. Multiple springs are fixedly provided inside both the first and second slots, and a stop plate is fixedly connected to the end of each spring away from the cylinder body. This provides good sealing performance and greatly reduces the possibility of oil leakage.

[0004] The oil seal ring is supported by a spring on the outside, which effectively increases the sealing performance of the oil seal ring. However, it is not convenient to adjust the pressure between the oil tanks. When the pressure inside the oil tank is too high, the oil squeezes the connection between the oil seal ring and the piston rod because the outside of the oil seal ring is supported by the spring, which can easily cause oil leakage. When the pressure inside the oil tank is too low, the oil seal effect is reduced. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a high-pressure resistant sealing device that solves the aforementioned problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure resistant sealing device, comprising a cylinder head and an oil seal structure. A through hole is vertically opened in the center of the cylinder head, and the through hole is vertically penetrated by a piston rod. The oil seal structure is located in the center of the inner wall of the through hole. The oil seal structure includes an oil groove, a fixed U-shaped sealing ring, a movable U-shaped sealing ring, a pressure regulating structure, an oil injection hole, an oil injection check valve, and a pressure sensor. A fixed U-shaped sealing ring is located at the bottom of the inner wall of the oil groove, and a movable U-shaped sealing ring is located at the top of the inner wall of the oil groove. The top of the movable U-shaped sealing ring is connected to the pressure regulating structure, which is installed on the top of the cylinder head. The oil injection hole is located at the inner edge of the cylinder head, and its right side communicates with the oil groove. The upper and lower sides of the left end of the oil groove are respectively connected to the oil injection check valve and the pressure sensor, and the oil injection check valve and the pressure sensor are respectively fixed to the outer wall of the cylinder head.

[0009] Preferably, an oil scraper ring and a rubber sealing ring are embedded in the bottom of the inner wall of the through hole, with the oil scraper ring positioned at the bottom of the rubber sealing ring. The inner walls of the oil scraper ring and the rubber sealing ring are in contact with the piston rod, and a dustproof sealing ring is installed on the top of the inner wall of the through hole.

[0010] Preferably, the pressure regulating structure includes a pressure plate, a spring, a movable plate, a vertical rod, a universal ball bearing, and an adjusting assembly. The top of the pressure plate is elastically connected to the movable plate via the spring. The top of the movable plate is fixedly connected to the vertical rod. The top of the vertical rod extends out of the cylinder head, and a universal ball bearing is installed at the top of the vertical rod. The adjusting assembly is installed at the top edge of the cylinder head, and the top of the universal ball bearing is supported by the adjusting assembly. The bottom of the pressure plate is used to support the movable U-shaped sealing ring.

[0011] Preferably, the adjusting assembly includes a fixed ring, an external threaded ring, an internal threaded ring, a rotating ring, a ratchet, and a pawl assembly. The fixed ring has an external threaded ring inside, and the bottom inner side of the fixed ring is fixedly connected to the bottom of the external threaded ring. The bottom of the internal threaded ring is located between the fixed ring and the external threaded ring, and the inner wall of the internal threaded ring is threadedly connected to the external threaded ring. The rotating ring is fixed to the top inner side of the internal threaded ring. A ratchet is fixed to the middle of the outer wall of the internal threaded ring, and the ratchet is fixedly connected to the internal threaded ring. A pawl assembly is installed on the inner wall of the fixed ring, and the pawl assembly meshes with the ratchet. The fixed ring is fixed to the top of the cylinder head, and both the fixed ring and the rotating ring are fitted onto the outside of the piston rod.

[0012] Preferably, the top of the internal threaded ring is circular, and the inner top surface of the internal threaded ring is used to support the universal ball bearing.

[0013] Preferably, the fixed ring and the rotating ring are sealed by a sealing ring.

[0014] Preferably, the pawl assembly includes a support plate, a fixed rotating shaft, a pawl, a tension spring support pin one, a tension spring support pin two, and a tension spring. One end of the pawl is rotatably connected to the support plate via the fixed rotating shaft, and the other end of the pawl engages with a ratchet. A tension spring support pin one is fixed in the middle of the pawl, and a tension spring support pin two is fixed in the top of the support plate. The tension spring support pin one and the tension spring support pin two are elastically connected by a tension spring.

[0015] (III) Beneficial Effects

[0016] This invention provides a high-pressure resistant sealing device. It offers the following advantages: By installing a fixed U-shaped sealing ring at the bottom and a movable U-shaped sealing ring at the top of the oil tank, and connecting an oil injection check valve and a pressure sensor to the outside of the oil injection hole connected to the oil tank, the pressure sensor detects the internal pressure of the oil tank. A pressure regulating structure is installed at the top of the movable U-shaped sealing ring, supporting its top. Rotating the rotating ring of the pressure regulating structure causes the internal threaded ring to move downwards, increasing the spring pressure. This spring presses down on the movable U-shaped sealing ring, increasing the internal pressure of the oil tank, thus achieving pressure regulation. Furthermore, if the internal pressure of the oil tank is too high, the spring provides cushioning, effectively reducing oil leakage and facilitating timely pressure release. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the oil seal structure of this utility model;

[0019] Figure 3 This is a partial view of the oil seal structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the pressure regulating structure in this utility model;

[0021] Figure 5 In this utility model Figure 4 A magnified view of a portion of area A;

[0022] Figure 6 This is a top view of the internal threaded ring structure in this utility model;

[0023] Figure 7 This is a schematic diagram of the ratchet assembly structure in this utility model.

[0024] In the diagram: Cylinder head - 1, Through hole - 2, Piston column - 3, Oil scraper ring - 4, Rubber sealing ring - 5, Oil seal structure - 6, Dustproof sealing ring - 7, Oil groove - 61, Fixed U-shaped sealing ring - 62, Movable U-shaped sealing ring - 63, Pressure regulating structure - 64, Oil filling hole - 65, Oil filling check valve - 66, Pressure sensor - 67, Pressure plate - 641, Spring - 642, Movable plate - 643, Vertical rod - 644, Universal joint Ball bearing - 645, Adjusting assembly - 646, Fixed ring - 6461, External threaded ring - 6462, Internal threaded ring - 6463, Rotating ring - 6464, Ratchet - 6465, Pawl assembly - 6466, Sealing ring - 6467, Support plate - 64661, Fixed rotating shaft - 64662, Pawl - 64663, Tension spring support pin one - 64664, Tension spring support pin two - 64665, Tension spring - 64666. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-3 This utility model provides a high-pressure resistant sealing device technical solution: a high-pressure resistant sealing device includes a cylinder head 1 and an oil seal structure 6. A through hole 2 is vertically opened in the center of the cylinder head 1, and the through hole 2 is vertically penetrated by a piston rod 3. The oil seal structure 6 is located in the center of the inner wall of the through hole 2. The oil seal structure 6 includes an oil tank 61, a fixed U-shaped sealing ring 62, a movable U-shaped sealing ring 63, a pressure regulating structure 64, an oil injection hole 65, an oil injection check valve 66, and a pressure sensor 67. A fixed U-shaped sealing ring is provided at the bottom of the inner wall of the oil tank 61. A sealing ring 62 is provided, and a movable U-shaped sealing ring 63 is provided on the top of the inner wall of the oil tank 61. The top of the movable U-shaped sealing ring 63 is connected to the pressure regulating structure 64. The pressure regulating structure 64 is installed on the top of the cylinder head 1. The oil injection hole 65 is opened at the inner edge of the cylinder head 1, and the right side of the oil injection hole 65 is connected to the oil tank 61. The upper and lower sides of the left end of the oil tank 61 are respectively connected to the oil injection check valve 66 and the pressure sensor 67, and the oil injection check valve 66 and the pressure sensor 67 are respectively fixed to the outer wall of the cylinder head 1.

[0027] Both the top surface of the fixed U-shaped sealing ring 62 and the bottom surface of the movable U-shaped sealing ring 63 are provided with U-shaped grooves, and the U-shaped grooves of the fixed U-shaped sealing ring 62 and the movable U-shaped sealing ring 63 are arranged opposite to each other. When the internal pressure of the oil tank 61 increases, the oil squeezes the inner wall of the U-shaped groove of the fixed U-shaped sealing ring 62 and the movable U-shaped sealing ring 63, so that the inner and outer walls of the fixed U-shaped sealing ring 62 and the movable U-shaped sealing ring 63 are tightly fitted with the piston 3 and the oil tank 61 respectively, thus improving the sealing effect of the fixed U-shaped sealing ring 62 and the movable U-shaped sealing ring 63.

[0028] The pressure sensor 67 uses the A5S15-10836832 pressure sensor, which has a wide pressure detection range and high detection accuracy.

[0029] An oil scraper ring 4 and a rubber sealing ring 5 are embedded in the bottom of the inner wall of the through hole 2, and the oil scraper ring 4 is located at the bottom of the rubber sealing ring 5. The inner walls of the oil scraper ring 4 and the rubber sealing ring 5 are in contact with the piston column 3. A dustproof sealing ring 7 is installed on the top of the inner wall of the through hole 2.

[0030] Please see Figure 4-6 The pressure regulating structure 64 includes a pressure plate 641, a spring 642, a movable plate 643, a vertical rod 644, a universal ball bearing 645, and an adjusting component 646. The top of the pressure plate 641 is elastically connected to the movable plate 643 via the spring 642. The top of the movable plate 643 is fixedly connected to the vertical rod 644. The top of the vertical rod 644 extends out of the cylinder head 1, and the universal ball bearing 645 is installed on the top of the vertical rod 644. The adjusting component 646 is installed at the top edge of the cylinder head 1, and the top of the universal ball bearing 645 is supported by the adjusting component 646. The bottom of the pressure plate 641 is used to support the movable U-shaped sealing ring 63.

[0031] The adjusting assembly 646 includes a fixed ring 6461, an external threaded ring 6462, an internal threaded ring 6463, a rotating ring 6464, a ratchet 6465, and a pawl assembly 6466. The fixed ring 6461 has an external threaded ring 6462 inside it, and the inner bottom end of the fixed ring 6461 is fixedly connected to the bottom of the external threaded ring 6462. The bottom of the internal threaded ring 6463 is located between the fixed ring 6461 and the external threaded ring 6462, and the inner wall of the internal threaded ring 6463 is connected to the outer threaded ring 6464. The 62 threaded connection has a rotating ring 6464 fixed on the inner top of the internal threaded ring 6463, a ratchet 6465 fixed in the middle of the outer wall of the internal threaded ring 6463, and the ratchet 6465 is fixedly connected to the internal threaded ring 6463. A pawl assembly 6466 is installed on the inner wall of the fixed ring 6461, and the pawl assembly 6466 and the ratchet 6465 mesh with each other. The fixed ring 6461 is fixed to the top of the cylinder head 1, and both the fixed ring 6461 and the rotating ring 6464 are fitted on the outside of the piston column 3.

[0032] The top of the internal threaded ring 6463 is circular, and the inner top surface of the internal threaded ring 6463 is used to support the universal ball 645. The downward movement of the internal threaded ring 6463 presses down the universal ball 645, thereby pressing down the movable U-shaped sealing ring 63.

[0033] The fixed ring 6461 and the rotating ring 6464 are sealed by a sealing ring 6467, which is circular in shape, effectively preventing dust accumulation inside the fixed ring 6461.

[0034] Please see Figure 7 The pawl assembly 6466 includes a support plate 64661, a fixed rotating shaft 64662, a pawl 64663, a tension spring support pin 1 64664, a tension spring support pin 2 64665, and a tension spring 64666. One end of the pawl 64663 is rotatably connected to the support plate 64661 via the fixed rotating shaft 64662, and the other end of the pawl 64663 is engaged with the ratchet 6465. The tension spring support pin 1 64664 is fixed in the middle of the pawl 64663, and the tension spring support pin 2 64665 is fixed in the top of the support plate 64661. The tension spring support pin 1 64664 and the tension spring support pin 2 64665 are elastically connected by the tension spring 64666.

[0035] The fixed ring 6461 has a hole at the position corresponding to the pawl 64663. The hole is sealed with a rubber plug. When it is necessary to rotate the rotating ring 6464 in the opposite direction, the pawl 64663 is pulled outward through the workpiece through the hole, thus breaking the engagement between the pawl 64663 and the ratchet 6465.

[0036] During use, oil is injected into the oil injection hole 65 through the oil injection check valve 66. The oil enters the oil tank 61 through the oil injection hole 65. The upper and lower sides of the oil tank 61 are sealed by the fixed U-shaped sealing ring 62 and the movable U-shaped sealing ring 63. The pressure inside the oil tank 61 is detected by the pressure sensor 67.

[0037] When it is necessary to increase the internal pressure of the oil tank 61, the rotating ring 6464 is rotated, which in turn drives the internal threaded ring 6463 to rotate. The internal threaded ring 6463 moves downward through the threaded engagement with the external threaded ring 6462, and the internal threaded ring 6463 drives the outer ratchet 6465 to rotate synchronously. The ratchet 6465 engages with the pawl 64663 to prevent the internal threaded ring 6463, the rotating ring 6464, and the ratchet 6465 from rotating in opposite directions. When the internal threaded ring 6463 moves downward, it presses down on the universal ball 645. The universal ball 645 presses down on the spring 642 through the vertical rod 644 and the movable plate 643, increasing the pressure of the spring 642. The spring 642 then presses down on the movable U-shaped sealing ring 63, increasing the internal pressure of the oil tank 61. This achieves the effect of regulating the internal pressure of the oil tank 61. If the internal pressure of the oil tank 61 is too high, the spring 642 is squeezed to buffer the pressure, effectively reducing oil leakage from the oil tank 61.

[0038] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0039] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure resistant sealing device, comprising a cylinder head (1), wherein a through hole (2) is vertically opened in the inner center of the cylinder head (1), and the through hole (2) is vertically penetrated by a piston rod (3); Its features are: It also includes an oil seal structure (6), which is disposed in the middle of the inner wall of the through hole (2). The oil seal structure (6) includes an oil tank (61), a fixed U-shaped sealing ring (62), a movable U-shaped sealing ring (63), a pressure regulating structure (64), an oil injection hole (65), an oil injection check valve (66), and a pressure sensor (67). The bottom of the inner wall of the oil tank (61) is provided with a fixed U-shaped sealing ring (62), and the top of the inner wall of the oil tank (61) is provided with a movable U-shaped sealing ring (63). The top of the U-shaped sealing ring (63) is connected to the pressure regulating structure (64), which is installed on the top of the cylinder head (1). The oil injection hole (65) is opened at the inner edge of the cylinder head (1), and the right side of the oil injection hole (65) is connected to the oil tank (61). The upper and lower sides of the left end of the oil tank (61) are connected to the oil injection check valve (66) and the pressure sensor (67) respectively, and the oil injection check valve (66) and the pressure sensor (67) are fixed to the outer wall of the cylinder head (1).

2. The high-pressure resistant sealing device according to claim 1, characterized in that: An oil scraper ring (4) and a rubber sealing ring (5) are embedded in the bottom of the inner wall of the through hole (2), and the oil scraper ring (4) is located at the bottom of the rubber sealing ring (5). The inner walls of the oil scraper ring (4) and the rubber sealing ring (5) are in contact with the piston column (3). A dustproof sealing ring (7) is installed on the top of the inner wall of the through hole (2).

3. The high-pressure resistant sealing device according to claim 1, characterized in that: The pressure regulating structure (64) includes a pressure plate (641), a spring (642), a movable plate (643), a vertical rod (644), a universal ball bearing (645), and an adjusting component (646). The top of the pressure plate (641) is elastically connected to the movable plate (643) via the spring (642). The top of the movable plate (643) is fixedly connected to the vertical rod (644). The top of the vertical rod (644) extends out of the cylinder head (1), and a universal ball bearing (645) is installed at the top of the vertical rod (644). The adjusting component (646) is installed at the top edge of the cylinder head (1), and the top of the universal ball bearing (645) is supported by the adjusting component (646). The bottom of the pressure plate (641) is used to support the movable U-shaped sealing ring (63).

4. The high-pressure resistant sealing device according to claim 3, characterized in that: The adjusting assembly (646) includes a fixed ring (6461), an external threaded ring (6462), an internal threaded ring (6463), a rotating ring (6464), a ratchet (6465), and a pawl assembly (6466). The fixed ring (6461) has an external threaded ring (6462) inside it, and the inner side of the bottom end of the fixed ring (6461) is fixedly connected to the bottom of the external threaded ring (6462). The bottom of the internal threaded ring (6463) is located between the fixed ring (6461) and the external threaded ring (6462), and the inner wall of the internal threaded ring (6463) is connected to the outer threaded ring (6464). 2) Threaded connection: A rotating ring (6464) is fixed on the inner side of the top of the internal threaded ring (6463). A ratchet (6465) is fixed in the middle of the outer wall of the internal threaded ring (6463), and the ratchet (6465) is fixedly connected to the internal threaded ring (6463). A pawl assembly (6466) is installed on the inner wall of the fixed ring (6461), and the pawl assembly (6466) meshes with the ratchet (6465). The fixed ring (6461) is fixed to the top of the cylinder head (1), and both the fixed ring (6461) and the rotating ring (6464) are fitted on the outside of the piston column (3).

5. A high-pressure resistant sealing device according to claim 4, characterized in that: The top of the internal threaded ring (6463) is circular, and the inner top surface of the internal threaded ring (6463) is used to support the universal ball (645).

6. A high-pressure resistant sealing device according to claim 4, characterized in that: The fixed ring (6461) and the rotating ring (6464) are sealed by a sealing ring (6467).

7. A high-pressure resistant sealing device according to claim 4, characterized in that: The pawl assembly (6466) includes a support plate (64661), a fixed rotating shaft (64662), a pawl (64663), a tension spring support pin one (64664), a tension spring support pin two (64665), and a tension spring (64666). One end of the pawl (64663) is rotatably connected to the support plate (64661) via the fixed rotating shaft (64662), and the other end of the pawl (64663) is engaged with a ratchet (6465). The tension spring support pin one (64664) is fixed in the middle of the pawl (64663), and the tension spring support pin two (64665) is fixed in the top of the support plate (64661). The tension spring support pin one (64664) and the tension spring support pin two (64665) are elastically connected by the tension spring (64666).

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