A gap automatic compensation type oil pressure seal door and a method for using the same

Abstract

The present application relates to a kind of gap automatic compensation formula oil pressure sealing door.It includes: door body, rotating disc, hinge, battery, oil tank, oil pump, sealing piston, sealing ring, limit ring, two-way valve, sealing ball, small spring, oil cylinder, large spring;The axis of the door body, the sealing piston, the limit ring, the two-way valve, the sealing ball, the small spring, the oil cylinder and large spring are on a straight line.The present application is a kind of gap automatic compensation formula oil pressure sealing door, and the system is according to the gap change caused by thermal expansion and cold shrinkage, vibration, installation deviation etc., the oil pump automatically adjusts the size of constant pressure oil amount, so that the sealing piston is always pressed tightly box with constant pressure, adaptive dynamic adjustment;The oil pump only needs initial build pressure, and after build pressure, the sealing ball is closed under the joint action of the small spring pressure and oil pressure Oil hole of the two-way valve, realize pressure maintenance, the oil pump enters standby state, without frequently replacing vulnerable oil pressure parts, so that maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to a sealing door, specifically to a hydraulic sealing door with automatic gap compensation and its usage method. Background Technology

[0002] In industries such as industry, aerospace, and shipbuilding, hatches (especially vacuum chambers, pressure chambers, and explosion-proof chambers) have extremely high requirements for airtightness, reliability, and lifespan. Hatches frequently face conditions such as thermal expansion and contraction, vibration and impact, fluctuations in internal and external pressure differences, and minor deformations of the frame. The sealing system must be able to compensate for changes in sealing gaps in real time, eliminating gap leakage and meeting the stringent leakage rate standards for vacuum, high-pressure, and explosion-proof scenarios. Hatches in aerospace, deep-sea, and industrial scenarios need to operate in harsh environments such as high and low temperatures, corrosive media, and strong vibrations. The sealing system must eliminate reliance on electronic control components, relying on a purely mechanical hydraulic structure to achieve stable operation and avoid environmental failure of electronic control components. High-end hatch sealing systems must have long lifespan characteristics to reduce downtime maintenance, prevent rapid aging of seals due to overpressure or underpressure, and reduce the wear rate of hydraulic components.

[0003] Traditional solutions generally have shortcomings. For example, rubber gasket seals rely solely on the elasticity of the rubber to compensate for gaps, resulting in minimal compensation. Rubber is also prone to permanent deformation and has a short lifespan. Direct-acting oil pump seals have high energy consumption and rapid pump wear. Relying on electronically controlled pressure compensation leads to response delays and potential leakage. Mechanically locked seals, with their rigid structures, cannot compensate for gap changes caused by thermal expansion and contraction or vibration. Inflatable seals rely on airbags to press the cover, but these airbags are prone to rupture due to fatigue and aging. Fluctuations in inflation pressure directly affect the sealing effect, and the elasticity of the airbags decreases at low temperatures, while plastic deformation easily occurs at high temperatures, resulting in poor adaptability.

[0004] To address the numerous drawbacks of traditional sealed hatches, this invention provides a hydraulically pressurized sealing door and its application method that are simple to operate, offer excellent sealing performance, high reliability, long lifespan, low energy consumption, and can automatically compensate for gaps. This automatically compensated hydraulically pressurized sealing door adaptively and dynamically adjusts the seal based on gap changes caused by thermal expansion and contraction, vibration, and installation deviations. Its purely mechanical compensation mechanism meets the reliability requirements of hatches with "low maintenance and high redundancy," and is adaptable to various operating conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic sealing door that is simple to operate, has good sealing performance, high reliability, long service life, low energy consumption, and can automatically compensate for gaps, as well as its usage method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An automatic gap-compensating hydraulic sealing door, characterized in that it comprises: a door body, a rotating disk, a hinge, a battery, an oil tank, an oil pump, a sealing piston, a sealing ring, a limiting ring, a two-way valve, a sealing ball, a small spring, an oil unloading cylinder, and a large spring; the door body is fixedly connected to the rotating disk, and the rotating disk is connected to the hinge via a bearing; the battery, the oil tank, and the oil pump are installed inside the door body, and the oil tank and the oil pump are connected via an oil pipeline; the door body and the limiting ring are interference-fitted together, the door body and the sealing piston are clearance-fitted together, the sealing piston and the sealing ring are interference-fitted together, the sealing piston is fixedly connected to one end of the two-way valve, and the other end of the two-way valve is fixedly connected to the oil unloading cylinder; the oil unloading cylinder is connected to the door body via a large spring, and the sealing ball is connected to the oil unloading cylinder via a small spring and abuts against the other end of the two-way valve; the axes of the door body, the sealing piston, the limiting ring, the two-way valve, the sealing ball, the small spring, the oil unloading cylinder, and the large spring are on a straight line.

[0008] Furthermore, the door body is a semi-circular cylindrical structure. The semi-circular end is provided with a groove and the oil pipeline. The cylindrical end is provided with an annular groove and a cylindrical hole in the middle. Locking rulers are provided on the outer side of the cylindrical end, evenly distributed around the circumference. An annular oil groove is provided on the inner side of the cylindrical end, located at the outlet of the oil pipeline. The groove houses the battery, the oil tank, and the oil pump. The annular groove at the cylindrical end houses the sealing piston. The cylindrical hole at the cylindrical end houses the two-way valve, the sealing ball, the small spring, the oil unloading cylinder, and the large spring.

[0009] Furthermore, the sealing piston has a cylindrical structure with a circumferential sealing groove on the cylindrical surface, an oil hole in the radial direction, and an annular U-shaped groove inside. One end face of the U-shaped groove has a cylindrical hole, the inner side of the other end face has an arc groove, and the outer side of the other end face has an annular sealing groove. The outer circle of the sealing piston is clearance-fitted with the door body and is slidably connected. The sliding seal is achieved through an annular sealing ring. The cylindrical hole of the sealing piston is clearance-fitted with the protrusion of the door body and is slidably connected. The annular sealing groove of the sealing piston is interference-fitted with the sealing ring.

[0010] Furthermore, the bidirectional valve has a cylindrical structure with symmetrical stepped holes with conical bottoms inside, and the stepped holes are connected through cylindrical oil holes; one end of the bidirectional valve abuts against the arc groove of the sealing piston and is fixedly connected to the sealing piston, and the other end abuts against the sealing ball and is fixedly connected to the oil unloading cylinder.

[0011] Furthermore, the oil unloading cylinder is a hollow cylindrical structure with a flange. A longitudinal through groove is opened on the side wall of the hollow cylinder, and a cylindrical positioning boss is set at the bottom of the groove. The large spring is sleeved on the hollow cylinder. One end of the large spring is fixedly connected to the door body and the other end is fixedly connected to the flange. One end of the small spring is fixedly connected to the boss and the other end is connected to the sealing ball.

[0012] Furthermore, a pressure stabilizing valve is fixedly installed on the oil pipeline.

[0013] Furthermore, it also includes a control system located inside the door, with control buttons on the door, which controls the coordinated operation of the entire device.

[0014] Furthermore, the method of using this automatic compensating hydraulic sealing door includes the following steps:

[0015] S01. Align the locking ruler on the outer side of the cylindrical end of the door with the groove on the end face of the box body one by one, push the door body in, and the locking ruler enters along the straight groove to complete the initial positioning;

[0016] S02. Rotate the rotating disk clockwise to drive the door lock to rotate, thereby pressing the door axially towards the box body;

[0017] S03. Press the start button, the battery supplies power to the oil pump, draws oil from the oil tank and applies it to a constant pressure, and delivers it through the oil circuit to the cavity formed by the door and the two-way valve; the sealing piston extends under the combined action of the large spring and the oil pressure, and presses the sealing piston and the sealing ring against the end face of the housing to achieve a seal;

[0018] S04. When the oil pressure on both sides of the sealing ball is equal, the sealing ball closes the oil hole of the two-way valve under the combined action of the small spring pressure and the oil pressure, thereby achieving pressure locking and pressure maintenance, and the oil pump enters the standby state;

[0019] S05. The system automatically adjusts the constant pressure oil volume of the oil pump according to the gap changes caused by thermal expansion and contraction, vibration, installation deviation, etc., so that the sealing piston always presses the box with a constant pressure, adaptively and dynamically adjusting without manual intervention throughout the process.

[0020] S06. After the work is completed, press the stop button. The oil pump will reverse to draw oil, the oil will flow back, the large spring will reset, the sealing piston will retract, and the rotating disk will be rotated counterclockwise, allowing the door to be easily opened.

[0021] The beneficial effects of implementing the present invention, which discloses an automatic gap-compensating hydraulic sealing door and its usage method, are as follows:

[0022] (1) The system automatically adjusts the constant pressure oil volume according to the gap changes caused by thermal expansion and contraction, vibration, installation deviation, etc., so that the sealing piston always presses the box with constant pressure and adapts to dynamic adjustment; the system has no response delay, no manual intervention is required throughout the process, there is no leakage window throughout the process, and it achieves adaptive sealing under all working conditions. The airtightness is durable and reliable, far exceeding the gap compensation capability of traditional rubber gaskets and mechanical locking.

[0023] (2) The oil pump only needs to build up pressure initially. After pressure is built up, the sealing ball closes the oil hole of the two-way valve under the combined action of the small spring pressure and the oil pressure to achieve pressure locking and pressure holding, and the oil pump enters the standby state. The oil pump outputs constant pressure oil to replenish oil only when the sealing gap increases, and the oil pump sucks away excess hydraulic oil when the gap decreases. The energy consumption is greatly reduced compared with the traditional direct-drive oil pump scheme, and there is no need to frequently replace the seals and vulnerable hydraulic components, which greatly reduces the maintenance cost in the later stage.

[0024] (3) When sealing, the oil pump can be started with one button to automatically build up pressure and lock pressure, and the seal can be maintained without manual intervention. When unlocking, the oil pump draws oil in reverse, the oil flows back smoothly, and the sealing piston contracts slowly. There is no rigid rebound impact throughout the process, which avoids the door body from colliding with the box body and the sealing ring from scratching. The operation process is safe and smooth. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the overall structure of an automatic gap-compensating hydraulic sealing door according to the present invention;

[0026] Figure 2 This is a perspective view of an automatic gap-compensating hydraulic sealing door according to the present invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the door body of an automatic gap-compensating hydraulic sealing door according to the present invention;

[0028] Figure 4 This is a three-dimensional structural diagram of the sealing piston of an automatic gap-compensating hydraulic sealing door according to the present invention;

[0029] Figure 5 This is a three-dimensional structural diagram of the oil unloading cylinder of an automatic gap-compensating hydraulic sealing door according to the present invention;

[0030] In the diagram: 1-Door body, 2-Rotating disc, 3-Hinge, 4-Battery, 5-Oil tank, 6-Oil pump, 7-Sealing piston, 8-Sealing ring, 9-Limiting ring, 10-Two-way valve, 11-Sealing ball, 12-Small spring, 13-Unloading cylinder, 14-Large spring. Detailed Implementation

[0031] The present invention, a hydraulically sealed door with automatic gap compensation and its method of use, is further described below with reference to the accompanying drawings:

[0032] like Figure 1 , 2 As shown in Figures 3, 4, and 5, this invention provides an automatic gap-compensating hydraulic sealing door, characterized by comprising: a door body 1, a rotating disk 2, a hinge 3, a battery 4, an oil tank 5, an oil pump 6, a sealing piston 7, a sealing ring 8, a limiting ring 9, a two-way valve 10, a sealing ball 11, a small spring 12, an oil unloading cylinder 13, and a large spring 14; the door body 1 is fixedly connected to the rotating disk 2, and the rotating disk 2 is connected to the hinge 3 via bearings, significantly reducing rotational resistance, making the door opening and closing smoother and less labor-intensive, reducing wear at the connection between the door body 1 and the rotating disk 2, and extending the structural service life; the battery 4, the oil tank 5, and the oil pump 6 are installed inside the door body 1, and the oil tank 5 and the oil pump 6 are connected via an oil pipeline; the door body 1 and the limiting ring 9 are interference-fitted together to limit the extension of the sealing piston 7 and prevent the sealing piston 7 from extending too far. Excessive size can cause detachment; the door body 1 and the sealing piston 7 are connected with a clearance fit to achieve axial displacement of the sealing piston 7, reduce wear on the mating surfaces, and ensure the sensitivity of hydraulic compensation; the sealing piston 7 and the sealing ring 8 are connected with an interference fit to achieve sealing inside and outside the box; the sealing piston 7 is in contact with one end of the two-way valve 10, and the other end of the two-way valve 10 is fixedly connected to the unloading cylinder 13; the unloading cylinder 13 is connected to the door body 1 through the large spring 14, and the sealing ball 11 is connected to the unloading cylinder 13 through the small spring 12, and abuts against the other end of the two-way valve 10; the axes of the door body 1, the sealing piston 7, the limiting ring 9, the two-way valve 10, the sealing ball 11, the small spring 12, the unloading cylinder 13, and the large spring 14 are on a straight line to ensure the normal operation of the sealing door.

[0033] Furthermore, the door body 1 has a semi-circular cylindrical structure. The semi-circular end has a groove and the oil supply pipe. The groove is used to install the battery 4, the oil tank 5, and the oil pump 6. The cylindrical end has an annular groove with a cylindrical hole in the middle. The sealing piston 7 is installed in the annular groove and can slide axially along the door body 1. The cylindrical hole at the cylindrical end houses the two-way valve 10, the sealing ball 11, the small spring 12, the oil unloading cylinder 13, and the large spring 14. A locking scale is provided on the outer side of the cylindrical end. The locking gauges are evenly distributed circumferentially, and each gauge corresponds to a straight groove on the end face of the housing. When the door 1 is pushed in, the locking gauges enter along the straight grooves, completing the initial positioning. Rotating the rotating disk 2 causes the locking gauges of the door 1 to rotate, which can lock the door 1 and the housing along the axial direction of the housing. An annular oil groove is provided on the inner side of the cylindrical end, located at the outlet of the oil pipeline, to prevent the oil pipeline from shifting radially with the sealing piston 7 due to the rotation of the door 1, and to prevent the sealing piston 7 from sliding axially and causing the oil hole to shift, thus preventing the oil from flowing normally.

[0034] Furthermore, the sealing piston 7 has a cylindrical structure with a circumferential sealing groove on its outer cylindrical surface and an oil hole in the radial direction. An annular sealing ring is installed in the circumferential sealing groove, and the oil hole allows oil flowing from the oil passage of the door body 1 to enter the interior of the sealing piston 7. The cylindrical surface of the sealing piston 7 is clearance-fitted with the door body 1, forming a sliding connection, and the annular sealing ring achieves a sliding seal to prevent oil leakage. The sealing piston 7 has an annular U-shaped groove inside, and a cylindrical hole is opened on one end face of the U-shaped groove. The cylindrical hole is clearance-fitted with the protrusion of the door body 1, forming a sliding connection. An arc groove is opened on the inner side of the other end face of the U-shaped groove to allow normal flow of oil between the U-shaped groove and the two-way valve 10, and an annular sealing groove is opened on the outer side of the other end face. The annular sealing groove is interference-fitted with the sealing ring 8, and the sealing ring 8 prevents the exchange of media between the inside of the box and the outside, thus playing a sealing role.

[0035] Furthermore, the two-way valve 10 has a cylindrical structure with symmetrically arranged stepped holes with conical bottoms inside, which are connected by cylindrical oil holes; one end of the two-way valve 10 abuts against the arc groove of the sealing piston 7 and is fixedly connected to the sealing piston 7, and the other end abuts against the sealing ball 11 and is fixedly connected to the unloading cylinder 13; the sealing ball 11 controls the opening and closing of the cylindrical oil hole of the two-way valve 10, so that the hydraulic oil flows from the inside of the two-way valve 10 into the inside of the unloading cylinder 13.

[0036] Furthermore, the unloading cylinder 13 is a hollow cylindrical structure with a flange. A longitudinal through groove is opened on the side wall of the hollow cylinder, so that the hydraulic oil flows from the inside of the unloading cylinder 13 into the cavity formed by the gate body 1 and the two-way valve 10. A cylindrical positioning boss is provided at the bottom of the groove to realize the axial fixation of the small spring 12. The large spring 14 is sleeved on the hollow cylinder. One end of the large spring 14 is fixedly connected to the gate body 1, and the other end is fixedly connected to the flange. The large spring 14 controls the axial movement of the sealing piston 7 through its elastic force. One end of the small spring 12 is fixedly connected to the boss, and the other end is fixedly connected to the sealing ball 11. The small spring 12 controls the sealing ball 11 through its elastic force, thereby controlling the opening and closing of the cylindrical oil hole of the two-way valve 10.

[0037] Furthermore, a pressure stabilizing valve is fixedly installed in the oil pipeline to ensure a constant oil pressure inside the pipeline.

[0038] Furthermore, it also includes a control system, which is located inside the door 1, and the control buttons of the control system are located on the door 1. The control system controls the coordinated operation of the entire device.

[0039] like Figure 1 , 2 As shown in Figures 3, 4, and 5, the working principle of the automatic gap compensation hydraulic sealing door of the present invention is as follows:

[0040] After the door 1 is closed and tightened, pressing the start button powers the oil pump 6, drawing oil from the oil tank 5 and applying it to a constant pressure. The oil flows out of the oil passage of the door 1, filling the annular oil groove, and then flows along the radial oil hole of the sealing piston 7 into the annular U-shaped groove of the sealing piston 7. Once the annular U-shaped groove of the sealing piston 7 is full, the oil flows along the arc groove at one end of the U-shaped groove into the cavity formed by the two-way valve 10 and the sealing piston 7. The oil pressure overcomes the preload of the small spring 12, pushing open the sealing ball 11 and entering the oil discharge chamber 13, then through the... The longitudinal through groove on the side wall of the oil unloading chamber 13 leads into the cavity formed by the door body 1 and the two-way valve 10; the sealing piston 7 extends under the combined action of the large spring 14 and the oil pressure until the sealing ring 8 presses against the end face of the housing, eliminating the initial gap of the sealing surface; when the system pressure reaches the sealing set value, the pressure at both ends of the sealing ball 11 is equal, and the sealing ball 11 closes the oil hole of the two-way valve 10 under the combined action of the small spring 12 pressure and the oil pressure, and the oil achieves pressure locking and pressure maintenance; at this time, the sealing piston 7 remains in a rigid pressing state, the sealing surface forms a stable airtight seal, and the oil pump 6 enters the standby state.

[0041] When the gap between the sealing surfaces increases due to problems such as cooling shrinkage, vibration displacement, and aging of the seals, the pressure in the cavity formed by the door body 1 and the two-way valve 10 decreases. In the cavity formed by the two-way valve 10 and the sealing piston 7, constant pressure oil output by the oil pump 6 provides a constant pressure. At this time, a pressure difference appears at both ends of the sealing ball 11, and the sum of the oil pressure and the spring force of the small spring 12 in the cavity formed by the oil unloading cylinder 13 and the two-way valve 10 is less than that in the cavity formed by the two-way valve 10 and the sealing piston 7. Internal oil pressure; the sealing ball 11 is pushed open, and the oil enters the cavity formed by the oil unloading cylinder 13 and the two-way valve 10 through the cylindrical oil hole of the two-way valve 10 to replenish the oil, and then enters the cavity formed by the door body 1 and the two-way valve 10 through the longitudinal through groove on the side wall of the oil unloading cavity 13, pushing the sealing piston 7 to extend and accurately fill the gap; after the gap is eliminated, the pressure at both ends of the sealing ball 11 is equal, and the oil hole of the two-way valve 10 is once again pressed and closed by the sealing ball 11, locking and maintaining pressure again, and the clamping force returns to constant.

[0042] When the sealing surface expands due to temperature rise, the frame deforms, and the pressure difference squeezes, causing the gap to shrink, the pressure in the cavity formed by the door body 1 and the two-way valve 10 increases, exceeding the constant oil pressure in the cavity formed by the two-way valve 10 and the sealing piston 7. The oil flows back slightly to the U-shaped groove of the sealing piston 7 through the gap between the door body 1 and the two-way valve 10, and the excess hydraulic oil is drawn back by the oil pump 6 in the opposite direction, always maintaining a constant oil pressure in the U-shaped groove of the sealing piston 7. The sealing piston 7 retracts slightly to avoid overpressure deformation of the seal, and the clamping force is always kept within the optimal working range of the seal. If the pressure in the cavity formed by the door body 1 and the two-way valve 10 decreases due to long-term slight leakage, the oil pump 6 automatically starts briefly to replenish oil at constant pressure, and then immediately goes into standby mode, balancing pressure maintenance and low energy consumption.

[0043] After the work is completed, pressing the stop button causes the oil pump 6 to reverse and draw oil back, automatically retracting the sealing piston 7. The oil in the cavity formed by the door body 1 and the two-way valve 10 flows back to the sealing piston 7 through the gap between the door body 1 and the two-way valve 10. Following the oil in the sealing piston 7, it flows back to the oil tank 5 through the radial oil passage of the sealing piston 7 and the oil hole of the door body 1, gradually reducing the oil cavity pressure. Under the action of the large spring 14, the sealing piston 7 slowly resets, the sealing surface clamping force is released smoothly without rigid rebound impact, and the door body 1 can be easily opened.

[0044] This invention relates to an automatic gap-compensating hydraulic sealing door, which achieves rigid pressing of the sealing surface and dynamic gap self-adaptation. The entire process is completed without active electronic control intervention, relying solely on the characteristics of the hydraulic fluid and structural mechanics to achieve sealing, gap compensation, and unlocking and pressure relief. It is suitable for all working conditions such as thermal expansion and contraction, vibration, and installation deviation, and consists of three core stages: sealing, dynamic adaptive compensation, and unlocking and pressure relief.

[0045] The present invention discloses a method for using an automatic gap-compensating hydraulic sealing door, comprising the following steps:

[0046] S01. Align the outer locking ruler of the cylindrical end of the door body 1 with the groove on the end face of the box body one by one, push the door body 1 in, and the locking ruler enters along the straight groove to complete the initial positioning;

[0047] S02. Rotate the rotating disk 2 clockwise to drive the lock of the door 1 to rotate, thereby pressing the door 1 axially towards the box body;

[0048] S03. Press the start button, the battery 4 supplies power to the oil pump 6, draws oil from the oil tank 5 and applies it to constant pressure, and delivers it through the oil circuit to the cavity formed by the door body 1 and the two-way valve 10; the sealing piston 7 extends under the combined action of the large spring 14 and the oil pressure, and presses the sealing piston 7 and the sealing ring 8 against the end face of the box to achieve a seal;

[0049] S04. When the oil pressure on both sides of the sealing ball 11 is equal, the sealing ball 11 closes the oil hole of the two-way valve 10 under the combined action of the pressure of the small spring 12 and the oil pressure, thereby achieving pressure locking and pressure maintenance, and the oil pump 6 enters the standby state.

[0050] S05. Based on the gap changes caused by thermal expansion and contraction, vibration, installation deviation, etc., the oil pump 6 automatically adjusts the constant pressure oil volume so that the sealing piston 7 always presses the box with a constant pressure, adaptively and dynamically adjusting without manual intervention throughout the process.

[0051] S06. After the work is completed, press the stop button. The oil pump 6 will reverse to draw oil, the oil will flow back, the large spring 14 will reset, the sealing piston 7 will retract, and the rotating disk 2 will be rotated counterclockwise, allowing the door 1 to be easily opened.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulically sealed door with automatic gap compensation, characterized in that, include: The components are: door body (1), rotating disk (2), hinge (3), battery (4), oil tank (5), oil pump (6), sealing piston (7), sealing ring (8), limiting ring (9), two-way valve (10), sealing ball (11), small spring (12), unloading cylinder (13), and large spring (14). The door body (1) is fixedly connected to the rotating disk (2), and the rotating disk (2) is connected to the hinge (3) through bearings. The battery (4), the oil tank (5), and the oil pump (6) are installed inside the door body (1), and the oil tank (5) and the oil pump (6) are connected through an oil pipeline. The door body (1) is press-fitted with the limiting ring (9), and the door body (1) is clearance-fitted with the sealing piston (7). The sealing piston (7) is press-fitted to the sealing ring (8), and the sealing piston (7) is fixedly connected to one end of the two-way valve (10). The other end of the two-way valve (10) is fixedly connected to the unloading cylinder (13). The unloading cylinder (13) is connected to the door body (1) through a large spring (14), and the sealing ball (11) is connected to the unloading cylinder (13) through a small spring (12) and abuts against the other end of the two-way valve (10). The axes of the door body (1), the sealing piston (7), the limiting ring (9), the two-way valve (10), the sealing ball (11), the small spring (12), the unloading cylinder (13), and the large spring (14) are on a straight line.

2. The automatic gap-compensating hydraulic sealing door as described in claim 1, characterized in that, The door body (1) is a semi-circular cylindrical structure. The semi-circular end is provided with a groove and the oil pipeline. The cylindrical end is provided with an annular groove and a cylindrical hole in the middle. The outer side of the cylindrical end is provided with a locking scale, which is evenly distributed around the circumference. The inner side of the cylindrical end is provided with an annular oil groove, located at the outlet of the oil pipeline. The groove houses the battery (4), the oil tank (5) and the oil pump (6). The annular groove at the cylindrical end houses the sealing piston (7). The cylindrical hole at the cylindrical end houses the two-way valve (10), the sealing ball (11), the small spring (12), the oil unloading cylinder (13) and the large spring (14).

3. The automatic gap-compensating hydraulic sealing door as described in claim 2, characterized in that, The sealing piston (7) is a cylindrical structure with a circumferential sealing groove on the outer cylindrical surface, an oil hole in the radial direction, and an annular U-shaped groove inside. A cylindrical hole is opened on one end face of the U-shaped groove, an arc groove is opened on the inner side of the other end face, and an annular sealing groove is opened on the outer side of the other end face. The outer cylindrical surface of the sealing piston (7) is clearance-fitted with the door body (1) and is slidably connected. The sliding seal is achieved through the annular sealing ring. The cylindrical hole of the sealing piston (7) is clearance-fitted with the protrusion of the door body (1) and is slidably connected. The annular sealing groove of the sealing piston (7) is interference-fitted with the sealing ring (8).

4. The automatic gap-compensating hydraulic sealing door as described in claim 3, characterized in that, The two-way valve (10) has a cylindrical structure with symmetrical stepped holes with conical bottoms inside. The stepped holes are connected through cylindrical oil holes. One end of the two-way valve (10) abuts against the arc groove of the sealing piston (7) and is fixedly connected to the sealing piston (7). The other end abuts against the sealing ball (11) and is fixedly connected to the unloading cylinder (13).

5. The automatic gap-compensating hydraulic sealing door as described in claim 1, characterized in that, The unloading cylinder (13) is a hollow cylindrical structure with a flange. A longitudinal through groove is opened on the side wall of the hollow cylinder, and a cylindrical positioning boss is set at the bottom of the groove. The large spring (14) is sleeved on the hollow cylinder. One end of the large spring (14) is fixedly connected to the door body (1), and the other end is fixedly connected to the flange. One end of the small spring (12) is fixedly connected to the boss, and the other end is fixedly connected to the sealing ball (11).

6. The automatic gap-compensating hydraulic sealing door as described in claim 1, characterized in that, The oil pipeline is fixedly equipped with a pressure stabilizing valve.

7. A hydraulically sealed door with automatic gap compensation as described in claim 1, characterized in that, It also includes a control system, which is located inside the door (1) and the control buttons of the control system are located on the door (1). The control system controls the coordinated operation of the entire device.

8. A method of using an automatically compensating hydraulic sealing door according to any one of claims 1-7, characterized in that, Includes the following steps: S01. Align the locking ruler on the outer side of the cylindrical end of the door (1) with the straight groove on the end face of the box body one by one, push the door (1) in, and the locking ruler enters along the straight groove to complete the initial positioning; S02. Rotate the rotating disk (2) clockwise to drive the door (1) lock to rotate, and press the door (1) axially toward the box; S03. Press the start button, the battery (4) supplies power to the oil pump (6), draws oil from the oil tank (5), and applies it to constant pressure, and delivers it through the oil circuit to the cavity formed by the door body (1) and the two-way valve (10); the sealing piston (7) extends under the combined action of the large spring (14) and the oil pressure, and presses the sealing piston (7) and the sealing ring (8) against the end face of the box body to achieve sealing; S04. When the oil pressure on both sides of the sealing ball (11) is equal, the sealing ball (11) closes the oil hole of the two-way valve (10) under the combined action of the pressure of the small spring (12) and the oil pressure, thereby achieving pressure locking and pressure holding, and the oil pump (6) enters the standby state. S05. Based on the gap changes caused by thermal expansion and contraction, vibration, installation deviation, etc., the oil pump (6) automatically adjusts the constant pressure oil volume so that the sealing piston (7) always presses the box with a constant pressure, adaptively and dynamically adjusting without manual intervention throughout the process. S06. After the work is completed, press the stop button, the oil pump (6) will reverse to draw oil, the oil will flow back, the large spring (14) will reset, the sealing piston (7) will retract, the rotating disk (2) will rotate counterclockwise, and the door (1) can be easily opened.

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