Hydraulic compensator and using method thereof

Abstract

The invention discloses a hydraulic compensator and a using method thereof, belongs to the technical field of underwater power equipment, and solves the problems that an existing underwater pressure compensator is large in occupied space, cannot be miniaturized, is complex in high-precision installation and is inconvenient to maintain. The device comprises a cylindrical shell, a guide cylinder, a diaphragm telescopic cylinder and a displacement feedback mechanism, the opening end of the telescopic cylinder abuts against the inner wall of the guide cylinder, a bottom diaphragm of the telescopic cylinder extends into the cylindrical shell and then is connected with the displacement feedback mechanism, and the space between the bottom diaphragm of the telescopic cylinder and the right end of the inner side of the cylindrical shell is a liquid inlet cavity; the displacement feedback mechanism adopts a linear-to-rotary structure; the telescopic cylinder is arranged in the liquid inlet cavity, the limiting end of the telescopic cylinder is connected with the right end of the cylindrical shell, and follow-up abutting connection between the outer side of the diaphragm at the bottom of the telescopic cylinder and the moving end of the displacement feedback mechanism is achieved through supporting of a first compression spring; the telescopic cylinder is pushed to move left and right according to the volume of liquid stored in the liquid inlet cavity, and the moving end of the displacement feedback mechanism abuts against the bottom of the telescopic cylinder in a follow-up mode all the time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater power equipment, in particular to a hydraulic compensator and a use method thereof. BACKGROUND

[0002] Most of the existing underwater pressure compensators are large in capacity and volume, and are suitable for large underwater equipment or large ROVs. Small and medium-sized underwater equipment or small and medium-sized ROVs are small in volume and limited in space, and thus cannot be used. Most of the existing pressure compensators use displacement sensors, which occupy a large space and cannot make the pressure compensator small.

[0003] In order to achieve high-precision liquid level detection, most of the existing compensators use linear displacement adjustment principle, but the biggest problem of this structure is the difficulty of installation. The higher the accuracy requirement of the compensator of this linear displacement type, the tighter the connection between the fixed seat and the telescopic structure, resulting in greater difficulty in installation.

[0004] In addition, the existing linear displacement compensator also uses Hall plus spring for telescopic adjustment in order to improve the accuracy of adjustment. The Hall plus spring will deform after a long time of use, causing inaccurate feedback displacement and reducing the adjustment accuracy. SUMMARY

[0005] The present application provides a hydraulic compensator with a clever structure design, which converts linear motion into rotary motion by following the diaphragm movement of the telescopic rod, uses an angle sensor as a sensor, makes the structure of the pressure compensator more compact, has high measurement accuracy, is smaller in volume and easier to install and maintain, and is suitable for small and medium-sized underwater equipment or small and medium-sized ROVs.

[0006] To achieve the above purpose, the present application is implemented by the following technical scheme: the present application provides a hydraulic compensator, which comprises a cylindrical shell, a guide cylinder, a diaphragm telescopic cylinder and a displacement feedback mechanism. The cylindrical shell and the guide cylinder are sealingly connected, the telescopic cylinder opening end abuts on the inner wall of the guide cylinder, the bottom diaphragm extends into the inside of the cylindrical shell and is connected with the displacement feedback mechanism, the space between the bottom diaphragm of the telescopic cylinder and the right end of the inside of the cylindrical shell is the liquid inlet chamber, and the cylindrical shell is further provided with an oil inlet opening connected with the liquid inlet chamber. The displacement feedback mechanism adopts a linear-to-rotary structure; the displacement feedback mechanism is arranged in the liquid inlet chamber, and the limiting end thereof is connected with the right end of the cylindrical shell, A first compression spring is arranged between the bottom diaphragm of the telescopic cylinder and the left end of the guide cylinder, and the first compression spring supports the follow-up abutment between the outside of the bottom diaphragm of the telescopic cylinder and the moving end of the displacement feedback mechanism; The liquid volume is stored in the liquid inlet cavity, the telescopic cylinder moves left and right, and the moving end of the displacement feedback mechanism is always in contact with the bottom of the telescopic cylinder.

[0007] Preferably, the opening end of the telescopic cylinder is provided with a boss that is in slidable contact with the inner side wall of the guide cylinder. Meanwhile, a telescopic diaphragm that matches the bottom of the telescopic cylinder is installed at the right side of the boss, between the cylindrical shell and the guide cylinder. The diaphragm is made of a flexible sealing material.

[0008] Preferably, the displacement feedback mechanism includes a fixed seat at the limiting end and a first rotary telescopic rod at the moving end. The upper end of the first rotary telescopic rod is hinged to the fixed seat, and the moving end of the first rotary telescopic rod is in contact with the bottom diaphragm of the telescopic cylinder. When the liquid inlet cavity is in an oil-free state, the first rotary telescopic rod is retracted into a vertical storage position, and the included angle between the first rotary telescopic rod and the right end side wall of the cylindrical shell is minimized, i.e. 0-30°. When the liquid inlet cavity is in an oil-filled state, the moving end of the first rotary telescopic rod is elongated along the bottom inner side wall of the cylindrical shell into a horizontal measurement position, and the moving end is always in contact with the bottom diaphragm of the telescopic cylinder and the bottom inner wall of the cylindrical shell.

[0009] Preferably, a second compression spring that matches the first rotary telescopic rod is further sleeved on the first rotary telescopic rod, and the elongation and retraction of the first rotary telescopic rod are controlled by the telescopic movement of the second compression spring.

[0010] Preferably, the moving end of the first rotary telescopic rod is provided with a sliding head that cooperates with the second compression spring. The sliding head is a mushroom-shaped protrusion with a smooth surface. The second compression spring is installed inside the first rotary telescopic rod. The moving end of the second compression spring is connected to the innermost end of the first rotary telescopic rod at the bottom of the sliding head, and the limiting end is connected to the bottom of the first rotary telescopic rod. The bottom inner side of the first rotary telescopic rod is further provided with a support T-bar. The bottom of the second compression spring is sleeved on the vertical bar of the support T-bar, and the limiting end is in contact with the horizontal bar of the support T-bar. The length of the vertical bar of the support T-bar is less than the length of the outermost short rod of the first rotary telescopic rod. The boss at the opening end of the telescopic cylinder is further provided with an inwardly recessed identification groove, and a ring-shaped identification ring is installed in the identification groove. The side wall of the guide cylinder is further provided with a horizontal visible window that matches the ring-shaped identification ring, and the horizontal visible window is provided with a displacement scale.

[0011] Preferably, a rotating shaft is provided in the fixed seat at the limiting end, and the upper non-telescopic end of the first rotary telescopic rod is hinged to the rotating shaft, so that the first rotary telescopic rod can rotate around the rotating shaft. The non-telescopic end of the first rotating telescopic rod is provided with a rotating outer shell, and the upper end of its supporting T-bar crossbar is also provided with a second rotating shaft. The second rotating shaft is provided with a through hole. After the rotating shaft passes through the through hole, the first rotating telescopic rod and the rotating shaft are hinged.

[0012] Preferably, the displacement feedback mechanism further includes a sensor, which is an angle sensor. The magnet of the angle sensor is mounted on the first rotating telescopic rod, and the angle sensor is mounted on the fixed base. The angle sensor detects the angle of rotation of the magnet with the first rotating telescopic rod to provide feedback on the change in liquid level in the liquid chamber.

[0013] Preferably, the cylindrical outer shell and the guide tube are detachably sealed together by a locking mechanism; the locking mechanism is a flange structure.

[0014] Preferably, the right end of the cylindrical outer shell is symmetrically provided with multiple sets of oil inlets that communicate with the liquid inlet chamber; Furthermore, a wiring port is provided on the right end of the cylindrical outer casing.

[0015] A method for using a hydraulic compensator includes the following steps: When the inlet chamber is filled with oil: S1. When the volume of liquid in the inlet chamber increases, the first compression spring is compressed, the second compression spring extends, and drives the first rotating telescopic rod to extend. The first rotating telescopic rod rotates around the rotating axis, which drives the magnet to rotate. The sensor detects the rotation of the magnet and feeds back the change in liquid level, that is, the liquid level value increases. S2. When the volume of liquid in the inlet chamber decreases, the first compression spring extends, the second compression spring is compressed, and the first rotating telescopic rod shortens. The first rotating telescopic rod rotates around the rotating axis, causing the magnet to rotate. The sensor detects the rotation of the magnet and feeds back the change in liquid level, that is, the liquid level value decreases.

[0016] The hydraulic compensator provided by this invention has the following beneficial effects: (1) The hydraulic compensator of the present invention has an ingenious structural design. By rotating the telescopic rod and the diaphragm in a follow-up contact, the linear motion of the diaphragm driven by the hydraulic pressure is converted into the rotational motion of the telescopic rod. The liquid level value is fed back by the change of the rotation angle, so as to realize the accurate measurement of the compensation liquid level and significantly improve the stability and accuracy of the liquid level detection.

[0017] Meanwhile, the invention uses an angle sensor, which effectively reduces the overall size and space occupancy of the device, making the pressure compensator more compact and smaller in size, and more suitable for use in small and medium-sized underwater equipment or small and medium-sized ROVs.

[0018] (2) The hydraulic compensator of the present application guarantees the smoothness of the telescopic cylinder movement and the cavity sealing property during the oil charging and discharging process through the telescopic cylinder end boss cooperating with the sliding abutment of the guide cylinder and the sealing structure of the telescopic diaphragm and the liquid inlet cavity; the detachable flange sealing connection of the cylindrical shell and the guide cylinder further realizes the convenient disassembly and maintenance of the device structure, effectively improves the operation convenience of the equipment device, and has a long service life. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Figure 1 is a structural schematic diagram of the hydraulic compensator in the present application; Figure 2 Figure 2 is a sectional structural schematic diagram of the front view in the present application; Figure 1 Figure 3 Figure 3 is a structural schematic diagram of the displacement feedback mechanism in the present application; Figure 4 Figure 4 is a sectional structural schematic diagram of the top view in the present application; Figure 1 Figure 5 Figure 5 is a mounting structure schematic diagram of the angle sensor in the present application; Figure 6 Figure 6 is a structural schematic diagram of the hydraulic compensator in the present application in the oil charging state.

[0020] In the figure: 1, cylindrical shell; 2, guide cylinder; 3, telescopic cylinder; 4, liquid inlet cavity; 5, oil inlet; 6, first compression spring; 7, fixed seat; 8, first rotary telescopic rod; 9, sliding head; 10, second compression spring; 11, rotary shaft; 12, angle sensor; 13, magnet; 14, locking mechanism; 15, annular identification ring; 16, transverse visual window. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0022] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiment 1

[0023] Please refer to Figures 1-6 , the present application provides a technical solution: As​​Figure 1 As shown, the hydraulic compensator provided by this invention includes a cylindrical outer shell 1, a guide cylinder 2, a diaphragm telescopic cylinder 3, and a displacement feedback mechanism. The cylindrical outer shell 1 and the guide cylinder 2 are sealed together to ensure the overall sealing performance of the device. Figure 2 As shown, the opening end of the telescopic cylinder 3 is provided with a boss that can slide against the inner wall of the guide cylinder 2. The sliding contact between the boss and the inner wall of the guide cylinder 2 can guide the telescopic cylinder 3 to move smoothly along the axis of the guide cylinder 2. Located to the right of the boss, at the connection between the cylindrical outer shell 1 and the guide cylinder 2, a telescopic diaphragm that fits and matches the bottom contour of the telescopic cylinder 3 is installed. The diaphragm is made of flexible sealing material to meet the actual requirements of flexible movement and sealing.

[0024] The opening end of the telescopic cylinder 3 abuts against the inner wall of the guide cylinder 2. The bottom diaphragm of the telescopic cylinder 3 extends into the interior of the cylindrical shell 1 and is connected to the displacement feedback mechanism. The bottom diaphragm of the telescopic cylinder 3 and the inner wall of the inner right end of the cylindrical shell 1 form a sealed liquid inlet chamber 4. The cylindrical shell 1 is also provided with an oil inlet 5 that communicates with the liquid inlet chamber 4, which is used to inject or discharge compensation liquid into the liquid inlet chamber 4.

[0025] like Figure 2 As shown, a first compression spring 6 is connected between the bottom diaphragm of the inner side of the telescopic cylinder 3 and the left end of the guide cylinder 2. Through the elastic support of the first compression spring 6, the outer side of the bottom diaphragm of the telescopic cylinder 3 can be made to move in sync with the moving end of the displacement feedback mechanism. This ensures that when the liquid volume inside the liquid inlet chamber 4 changes, the moving end of the displacement feedback mechanism can move synchronously with the bottom of the telescopic cylinder 3, maintaining the contact state. When the liquid volume inside the liquid inlet chamber 4 increases or decreases, the liquid pressure, through the liquid volume stored in the liquid inlet chamber 4, will push the telescopic cylinder 3 to move left and right along the inner wall of the guide cylinder 2. The moving end of the displacement feedback mechanism always moves in sync with the bottom of the telescopic cylinder 3, effectively ensuring the accuracy of the follow-up coordination between the displacement feedback mechanism and the bottom of the telescopic cylinder 3, laying the foundation for subsequent motion conversion and detection.

[0026] like Figure 3 As shown, the displacement feedback mechanism adopts a linear-to-rotary structure, which is entirely housed within the liquid inlet chamber 4, making full use of the internal space and meeting the requirements of miniaturized design. The displacement feedback mechanism includes a fixed seat 7 at the limiting end and a first rotating telescopic rod 8 at the moving end. The upper end of the first rotating telescopic rod 8 is hinged to the fixed seat 7, which is fixedly installed on the inner right end of the cylindrical outer shell 1. The upper end of the first rotating telescopic rod 8 is hinged to the fixed seat 7, allowing it to rotate around the hinge point. The moving end of the first rotating telescopic rod 8 abuts against the bottom diaphragm of the telescopic cylinder 3, realizing real-time displacement transmission.

[0027] The displacement feedback mechanism has two working positions: when the liquid inlet cavity 4 is in an un-oil-filled state, the first rotary telescopic rod 8 is retracted into a vertical storage position, at which time the included angle between the first rotary telescopic rod 8 and the right end side wall of the cylindrical shell 1 is the smallest, and the angle is 0-30°, which can effectively reduce the space occupancy of the mechanism in the un-working state.

[0028] When the liquid inlet cavity 4 is in an oil-filled state, the liquid pressure in the liquid inlet cavity 4 pushes the telescopic cylinder 3 to move to the left, driving the moving end of the first rotary telescopic rod 8 to extend to the left along the bottom inner side wall of the cylindrical shell 1, at which time the first rotary telescopic rod 8 enters a horizontal measurement position, and the moving end thereof is always in abutment with the bottom diaphragm of the telescopic cylinder 3 and the bottom inner wall of the cylindrical shell 1, forming a stable support and transmission relationship, thereby providing a stable support basis for subsequent rotation angle feedback of the liquid level change. Embodiment 2

[0029] As shown in Figure 3 The hydraulic compensator of the present application, in the displacement feedback mechanism, the first rotary telescopic rod 8 is further sleeved with a second compression spring 10 matched therewith, and the extension and contraction of the first rotary telescopic rod 8 are controlled through the extension and contraction of the second compression spring 10. By means of the elastic extension and contraction characteristics of the second compression spring 10, adaptive control of the extension and contraction actions of the first rotary telescopic rod 8 can be realized, so as to ensure that the extension and contraction movement of the telescopic rod has good reset ability and action smoothness. The moving end of the first rotary telescopic rod 8 is provided with a sliding head 9 matched with the second compression spring 10, the sliding head 9 is a smooth mushroom head-shaped protrusion, which can effectively reduce the abutment friction resistance between the sliding head 9 and the bottom diaphragm of the telescopic cylinder 3, and avoid damage to the diaphragm due to long-term friction.

[0030] The second compression spring 10 is installed inside the first rotary telescopic rod 8, the moving end of the second compression spring 10 is connected with the innermost end rod of the first rotary telescopic rod 8 at the bottom of the sliding head 9, and the limiting end thereof is connected with the bottom of the first rotary telescopic rod 8; the inner side of the bottom of the first rotary telescopic rod 8 is further provided with a support T rod, the bottom of the second compression spring 10 is sleeved on the vertical rod of the support T rod, and the limiting end thereof is in abutment with the horizontal rod of the support T rod, the second compression spring 10 is limited and supported by the support T rod, so as to ensure the coaxiality of the spring during extension and contraction, and prevent the spring from being skewed and jammed. The length of the vertical rod of the support T rod is less than the length of the outermost short rod of the first rotary telescopic rod 8, so as to avoid interference between the support T rod and the external structure during the extension and contraction of the telescopic rod.

[0031] In the hinge structure of the displacement feedback mechanism, the fixed seat 7 of the limiting end is provided with a rotating shaft 11, and the upper non- telescopic end of the first rotary telescopic rod 8 is hinged on the rotating shaft 11, so that the first rotary telescopic rod 8 can rotate around the rotating shaft 11.

[0032] The non- telescopic end of the first rotary telescopic rod 8 is provided with a rotary shell, and the support T-shaped rod crossbar upper end is further provided with a second rotating shaft, and the second rotating shaft is provided with a through hole matched with the diameter of the rotating shaft 11, and the rotating shaft 11 is arranged in the through hole, so as to complete the hinged assembly between the first rotary telescopic rod 8 and the fixed seat 7, and ensure that the first rotary telescopic rod 8 can stably rotate around the rotating shaft 11 when the telescopic cylinder 3 acts, and realize reliable conversion from linear motion to rotary motion. Example 3

[0033] As shown in Figure 4 and Figure 5 , the hydraulic compensator provided by the application further comprises a sensor, which is an angle sensor 12, for realizing accurate detection and data feedback of the liquid level change. The angle sensor 12 is installed on the outer side wall of the fixed seat 7, and the sensing end thereof faces the rotating direction of the first rotary telescopic rod 8; a magnet 13 matched with the angle sensor 12 is installed on the first rotary telescopic rod 8, and the angle sensor 12 detects the positive and negative rotation angles of the magnet 13 with the first rotary telescopic rod 8 to feed back the liquid level change value in the liquid cavity 4; when the first rotary telescopic rod 8 rotates around the rotating shaft 11 with the telescopic cylinder 3, the magnet 13 will rotate synchronously, and the angle sensor 12 can accurately feed back the liquid level change value in the liquid cavity 4 by detecting the rotation angle change of the magnet 13 in real time, so as to realize non-contact accurate detection of the liquid level and avoid interference of the contact detection on the moving parts.

[0034] The cylindrical shell 1 and the guide cylinder 2 are detachably and sealingly connected through a locking mechanism 14; the locking mechanism 14 is a flange structure, which is fastened through flanges and bolts. This structure not only facilitates the later disassembly and maintenance, but also can significantly improve the sealing reliability and pressure bearing capacity of the connection, so as to ensure that the internal liquid cavity 4 of the compensator does not leak in the underwater high-pressure environment, and meet the use requirements of the actual underwater working conditions.

[0035] Two groups of oil injection ports 5 connected with the liquid cavity 4 are symmetrically arranged on the right end shell of the cylindrical shell 1, and the two groups of oil injection ports 5 are symmetrically distributed along the axis of the cylindrical shell 1, so that bidirectional oil injection or oil discharge operation can be realized, and air bubbles generated in the liquid cavity 4 during the oil injection process can be effectively avoided, so as to ensure the fullness of the compensating liquid filling. In addition, a wiring port is further arranged on the right end shell of the cylindrical shell 1, and a waterproof sealing joint is arranged in the wiring port, which is used for electrically connecting the cables of the sensors and other electronic elements with the external control system through the wiring port.

[0036] The open end of the telescopic cylinder 3 is also provided with an annular identification ring 15, and the sidewall of the guide cylinder 2 is also provided with a transverse visible window 16 matched with the annular identification ring 15, and the transverse visible window 16 is provided with a displacement scale ruler, when the telescopic cylinder 3 moves left and right with the change of the liquid level, the annular identification ring 15 will move along the axis of the guide cylinder 2 synchronously, the operator can observe the relative position of the annular identification ring 15 and the scale ruler through the transverse visible window 16, directly read the displacement data, realize the actual electronic data measurement of the liquid level change, and also realize real-time visual detection, adapt to the detection requirements in different underwater environments, and effectively improve the applicability of the device. Example 4

[0037] The use method of the hydraulic compensator, comprising the following steps: As Figure 6 shown, when the liquid inlet cavity 4 is in the oil filling state: S1. Liquid level rising condition: when the liquid volume in the liquid inlet cavity 4 increases, the liquid pressure acts on the bottom diaphragm of the telescopic cylinder 3, pushes the telescopic cylinder 3 to move to one side of the guide cylinder 2, and the first compression spring 6 is compressed; at the same time, the second compression spring 10 is elongated and drives the first rotary telescopic rod 8 to elongate along the bottom inner sidewall of the cylindrical shell 1 to the left side; the first rotary telescopic rod 8 rotates around the rotating shaft 11 during the elongation process, thereby driving the magnet 13 to rotate synchronously. The sensor detects the change of the rotation angle of the magnet 13 in real time, converts it into an electrical signal and transmits it to the external control system, and feeds back the information that the liquid level value in the liquid inlet cavity 4 increases.

[0038] S2. Liquid level falling condition: when the liquid volume in the liquid inlet cavity 4 decreases, the pressure of the liquid on the bottom diaphragm of the telescopic cylinder 3 decreases, the first compression spring 6 in the compressed state is elongated under the action of the elastic recovery force, and pushes the telescopic cylinder 3 to reset to one side of the cylindrical shell 1; at this time, the first rotary telescopic rod 8 reversely rotates around the rotating shaft 11, and the magnet 13 fixed on the rotating shell thereof reversely rotates synchronously; the angle sensor 12 detects the reverse rotation angle of the magnet 13 in real time, converts it into a corresponding electrical signal and feeds back to the external control system, and accurately outputs the information that the liquid level value in the liquid inlet cavity 4 decreases.

[0039] When the liquid inlet cavity 4 is in the un-oil filling state, the first rotary telescopic rod 8 is retracted into the vertical storage position, at this time, the included angle between the first rotary telescopic rod 8 and the right end sidewall of the cylindrical shell 1 is the smallest; which can effectively reduce the space occupancy rate of the mechanism in the unworking state.

[0040] In summary, the hydraulic compensator of the present application has compact structure and smaller volume, converts linear motion into rotary motion through the follow-up cooperation of the rotary telescopic rod and the diaphragm, realizes accurate liquid level measurement by matching an angle sensor, improves detection stability and accuracy, and has stable device structure, convenient installation, detection and maintenance, long service life, and is more suitable for small and medium-sized underwater equipment or small and medium-sized ROV.

[0041] The above are only embodiments of the present application, for example, the diaphragm material is a flexible sealing material, a plurality of oil injection ports are arranged on the right end of the cylindrical shell and are communicated with the liquid inlet cavity, and the hydraulic compensator of the present application can be met.

[0042] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A hydraulic compensator, characterized in that, The utility model relates to a kind of telescopic cylinder, including cylindrical shell (1), guide cylinder (2), diaphragm telescopic cylinder (3) and displacement feedback mechanism, the cylindrical shell (1) and guide cylinder (2) are sealingly connected, the telescopic cylinder (3) open end portion abuts on the inner wall of the guide cylinder (2), and its bottom diaphragm extends into the inside of the cylindrical shell (1) and is connected with the displacement feedback mechanism, the space between the bottom diaphragm of the telescopic cylinder (3) and the inside right end portion of the cylindrical shell (1) is liquid inlet cavity (4), the cylindrical shell (1) is also provided with oil filling port (5) being connected with the liquid inlet cavity (4); The displacement feedback mechanism adopts a linear-to-rotary structure; the displacement feedback mechanism is arranged in the liquid inlet cavity (4), and a limiting end thereof is connected with the right end portion of the cylindrical shell (1), A first compression spring (6) is connected between the bottom diaphragm of the telescopic cylinder (3) and the left end portion of the guide cylinder (2), and the first compression spring (6) supports the outer side of the bottom diaphragm of the telescopic cylinder (3) to abut against the moving end of the displacement feedback mechanism. The volume of the liquid stored in the liquid inlet cavity (4) drives the telescopic cylinder (3) to move leftward and rightward, and the moving end of the displacement feedback mechanism always abuts against the bottom of the telescopic cylinder (3).

2. A hydraulic compensator according to claim 1, wherein The open end portion of the telescopic cylinder (3) is provided with a boss that can slide against the inner wall of the guide cylinder (2), and a telescopic diaphragm that matches the bottom of the telescopic cylinder (3) is arranged at the right side of the boss and connected between the cylindrical shell (1) and the guide cylinder (2), and the diaphragm and the inner wall of the cylindrical shell (1) form the liquid inlet cavity (4). The diaphragm is made of a flexible sealing material.

3. A hydraulic compensator according to claim 1, wherein The displacement feedback mechanism includes a fixed seat (7) of a limiting end and a first rotary telescopic rod (8) of a moving end, the upper end of the first rotary telescopic rod (8) is hinged to the fixed seat (7), and the moving end of the first rotary telescopic rod (8) abuts against the bottom diaphragm of the telescopic cylinder (3). When the liquid inlet cavity (4) is in an uncharged state, the first rotary telescopic rod (8) is retracted into a vertical storage position, and the included angle between the first rotary telescopic rod (8) and the right end wall of the cylindrical shell (1) is smallest, which is 0-30°. When the liquid inlet cavity (4) is in a charged state, the moving end of the first rotary telescopic rod (8) is elongated along the bottom inner wall of the cylindrical shell (1) to enter a horizontal measurement position, and the moving end always abuts against the bottom diaphragm of the telescopic cylinder (3) and the bottom inner wall of the cylindrical shell (1).

4. A hydraulic compensator according to claim 3, wherein The first rotary telescopic rod (8) is further sleeved with a second compression spring (10) matched therewith, and the extension and retraction of the first rotary telescopic rod (8) are controlled by the extension and retraction of the second compression spring (10).

5. A hydraulic compensator according to claim 4, wherein The moving end of the first rotating telescopic rod (8) is provided with a sliding head (9) matched with the second compression spring (10), the sliding head (9) is a smooth surface mushroom head-shaped protrusion, the second compression spring (10) is installed in the first rotating telescopic rod (8), the moving end of the second compression spring (10) is connected with the innermost end rod of the first rotating telescopic rod (8) at the bottom of the sliding head (9), and the limiting end is connected with the bottom of the first rotating telescopic rod (8); The bottom inner side of the first rotating telescopic rod (8) is further provided with a support T-shaped rod, the bottom of the second compression spring (10) is sleeved on the vertical rod of the support T-shaped rod, and the limiting end is abutted on the cross rod of the support T-shaped rod, The length of the vertical rod of the support T-shaped rod is less than the length of the outermost short rod of the first rotating telescopic rod (8); The opening end of the telescopic cylinder (3) is further provided with an inwardly recessed identification groove, a ring-shaped identification ring (15) is installed in the identification groove, and a lateral visible window (16) matched with the ring-shaped identification ring (15) is further arranged on the sidewall of the guide cylinder (2).

6. A hydraulic compensator according to claim 5, wherein The fixed seat (7) of the limiting end is provided with a rotating shaft (11), and the upper non- telescopic end of the first rotating telescopic rod (8) is hinged on the rotating shaft (11), so that the first rotating telescopic rod (8) can rotate around the rotating shaft (11); The non-telescopic end of the first rotating telescopic rod (8) is provided with a rotating shell, and the upper end of the cross rod of the support T-shaped rod is further provided with a second rotating shaft, the second rotating shaft is provided with a through hole, and the rotating shaft (11) passes through the through hole, so that the first rotating telescopic rod (8) is hinged with the rotating shaft (11).

7. A hydraulic compensator according to claim 6, wherein The displacement feedback mechanism further comprises a sensor, and the sensor is an angle sensor (12), The magnet (13) of the angle sensor (12) is installed on the first rotating telescopic rod (8), and the angle sensor (12) is installed on the fixed seat (7), so that the angle sensor (12) detects the positive and negative rotation angle of the magnet (13) with the first rotating telescopic rod (8) to feedback the liquid level change value in the liquid inlet cavity (4).

8. A hydraulic compensator according to claim 1, wherein The cylindrical shell (1) and the guide cylinder (2) are detachably and sealingly connected through a locking mechanism (14); the locking mechanism (14) is a flange structure.

9. A hydraulic compensator according to claim 1, wherein, A plurality of oil injection openings (5) connected with the liquid inlet cavity (4) are symmetrically arranged on the right end shell of the cylindrical shell (1); And the right end shell of the cylindrical shell (1) is further provided with a wiring port.

10. A method of using a hydraulic compensator according to any one of claims 1-9, characterized in that, The steps are as follows: When the liquid inlet cavity (4) is in the oil filling state: S1. When the liquid volume in the liquid inlet cavity (4) increases, the first compression spring (6) is compressed, the second compression spring (10) is elongated, the first rotating telescopic rod (8) is elongated, the first rotating telescopic rod (8) rotates around the rotating shaft (11) to drive the magnet (13) to rotate, the sensor (12) detects the rotation of the magnet (13) to feedback the liquid level change value, that is, the liquid level value increases; S2. When the liquid volume in the liquid inlet cavity (4) decreases, the first compression spring (6) is elongated, the second compression spring (10) is compressed, the first rotary telescopic rod (8) is shortened, the first rotary telescopic rod (8) rotates around the rotary shaft (11) to drive the magnet (13) to rotate, and the sensor (12) detects the rotation of the magnet (13) to feed back the liquid level change value, i.e. the liquid level value decreases.

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