Stacked deep sea hydraulic lock

Abstract

The present application relates to a kind of superimposed deep-sea hydraulic lock, including valve body, movable push rod and left valve core assembly and right valve core assembly installed at both ends of valve body, movable push rod is arranged in the control oil cavity of valve body, multiple oil paths are provided on valve body and multiple oil ports are communicated with oil path, and shuttle valve is provided on the oil path of valve body, the input end of both ends of shuttle valve is respectively communicated with the oil cylinder load end oil path and oil return port, and the output end of shuttle valve is communicated with the second annular oil cavity in valve core assembly by oil path, left valve core assembly and right valve core assembly are completely same in structure and are respectively arranged in left valve core cavity and right valve core cavity of valve body by valve seat.The present application is mature in processing technology, simple and compact in structure, improves the phenomenon of hydraulic lock locking failure caused by load end pressure change, flow is stable, reduces the oscillation of load end, compared with traditional hydraulic lock, with the advantages of small energy loss, good working reliability etc..

Description

Technical Field

[0001] This invention belongs to the field of deep-sea equipment technology, and specifically relates to a superimposed deep-sea hydraulic lock. Background Technology

[0002] Hydraulic locks, also known as pressure-holding locks, are integrated components in hydraulic systems, primarily functioning to maintain pressure. When the system suddenly loses pressure, the hydraulic cylinder or motor connected to the lock will not drop due to leakage or its own weight. Traditional hydraulic locks typically employ a design with two hydraulically controlled check valves, suitable for land-based operations. The pressure in the return line is close to atmospheric pressure, much lower than the pressure at the load end, ensuring reliable locking. However, in deep-sea operations, pressure compensation technology is typically used to overcome the influence of deep-sea environmental pressure on the system, with the tank pressure almost identical to the deep-sea environment pressure. Under normal deep-sea conditions, traditional hydraulic locks can still perform their locking function. However, when the load-side cylinder is suddenly subjected to a large impact, the pressure at one end of the cylinder will suddenly decrease while the pressure at the other end suddenly increases. If the reduced load pressure is lower than the tank pressure at the return port, the pressure at both ends of the check valve spool cannot maintain balance. Under the pressure difference between the tank and the load end, the valve spool opens, the push rod moves, and the hydraulic lock fails to lock.

[0003] In deep-sea environments, the return oil pressure of the system increases with depth under normal operating conditions. This can cause malfunctions in the hydraulic cylinder when the hydraulic lock is tightened and set at the set pressure. To address this issue, current technology typically employs parallel relief valves in deep-sea hydraulic locks. However, using relief valves results in larger and more complex valve components within the system. Another approach uses balance valves for pressure maintenance and overload protection, but this leads to significant power losses. Therefore, a stacked deep-sea hydraulic lock design is needed to overcome these shortcomings. Summary of the Invention

[0004] To address the problems of existing technologies, this invention provides a stacked deep-sea hydraulic lock to solve the problems of large size, complex structure, high power loss, and locking failure of existing hydraulic locks.

[0005] The technical solution adopted in this invention is a superimposed deep-sea hydraulic lock, which includes a valve body, a movable push rod, and a left valve core assembly and a right valve core assembly installed at both ends of the valve body. The valve body has a cuboid structure, and a control oil chamber is provided in the middle of the valve body. The movable push rod is located in the control oil chamber and divides the control oil chamber into a left control oil chamber and a right control oil chamber. The valve body is provided with multiple oil passages and multiple oil ports connected to the oil passages. A first oil passage and a second oil passage are symmetrically provided at both ends above the control oil chamber. The first end of the first oil passage is connected to the first oil port, and the second end of the first oil passage is connected to the left control oil port. The oil chambers are connected. The first end of the second oil passage is connected to the second oil port, and the second end of the second oil passage is connected to the right control oil chamber. The control oil chamber has a left valve core cavity and a right valve core cavity symmetrically arranged at both ends. Below the left and right valve core cavities are respectively provided a third oil passage and a fourth oil passage. The first end of the third oil passage is connected to the left valve core cavity, and the second end of the third oil passage is connected to the third oil port. A left shuttle valve is provided in the fifth oil passage. The first input end of the left shuttle valve is connected to the third oil port, and the second input end of the left shuttle valve is connected to the first return oil port. The output end of the left shuttle valve is connected to... The valve cover through hole on the valve cover of the left valve core assembly is connected. The first end of the fourth oil passage is connected to the right valve core cavity, and the second end of the fourth oil passage is connected to the fourth oil port. A right shuttle valve is provided in the sixth oil passage. The first input end of the right shuttle valve is connected to the fourth oil passage, the second input end of the right shuttle valve is connected to the second return oil port, and the output end of the right shuttle valve is connected to the valve cover through hole on the valve cover of the right valve core assembly. The left valve core assembly and the right valve core assembly have the same structure, and both the left valve core assembly and the right valve core assembly include a valve seat, a main valve core, a compression spring, a valve cover, and a spring support. The valve seats are respectively located in the... The left and right valve core cavities are provided with a plurality of valve seat oil inlet holes and a plurality of valve seat oil outlet holes evenly distributed on the outer side walls of the first and second ends of the valve seat, respectively. The main valve core is disposed in the valve seat, and the first end of the main valve core is in contact with the main valve core valve port of the first end of the valve seat. The outer side wall of the valve cover is provided with a valve cover through hole. The valve cover is disposed in the left and right valve core cavities, respectively, and the second end of the valve cover is disposed in the valve seat. The valve cover and the valve seat are sealed together by a sealing ring. The spring support is disposed inside the valve cover, and a compression spring is disposed between the spring support and the second end of the main valve core.

[0006] Preferably, the movable push rod includes a movable piston and a left push rod and a right push rod disposed at both ends of the movable piston. The outer side wall of the movable piston is in contact with the inner side wall of the control oil chamber. When the movable piston is in the middle position, the left end face of the left push rod is in contact with the end face of the main valve core in the left valve core assembly, and the right end face of the right push rod is in contact with the end face of the main valve core in the right valve core assembly.

[0007] Furthermore, the fifth oil passage includes a first branch oil passage, a second branch oil passage, a third branch oil passage, a fourth branch oil passage, and a fifth branch oil passage. The first end of the first branch oil passage is connected to the middle of the third oil passage, and the second end of the first branch oil passage is connected to the first end of the third branch oil passage through the second branch oil passage. The left shuttle valve is provided in the middle of the third branch oil passage, and the middle of the third branch oil passage is connected to the valve cover through hole on the valve cover of the left valve core assembly through the fourth branch oil passage. The second end of the third branch oil passage is connected to the fifth branch oil passage, and the fifth branch oil passage vertically penetrates the valve body. The lower end of the fifth branch oil passage is provided with a first oil return port.

[0008] Furthermore, the sixth oil passage includes a sixth branch oil passage, a seventh branch oil passage, an eighth branch oil passage, a ninth branch oil passage, and a tenth branch oil passage. The first end of the sixth branch oil passage is connected to the middle of the fourth oil passage, and the second end of the sixth branch oil passage is connected to the first end of the eighth branch oil passage through the seventh branch oil passage. The right shuttle valve is provided in the middle of the eighth branch oil passage, and the middle of the eighth branch oil passage is connected to the valve cover through hole on the valve cover of the right valve core assembly through the ninth branch oil passage. The second end of the eighth branch oil passage is connected to the tenth branch oil passage, and the tenth branch oil passage vertically penetrates the valve body. The lower end of the tenth branch oil passage is provided with a second return port.

[0009] Furthermore, a first annular oil cavity is formed between the valve seat, valve cover, and valve body, and the oil inlet of the valve seat is connected to the first annular oil cavity; the outer diameter of the main valve core is smaller than the inner diameter of the valve seat, and an annular oil passage is provided between the main valve core and the valve seat; the outer diameter of the valve seat is smaller than the inner diameter of the valve cover, and a second annular oil cavity is formed between the valve seat, valve cover, and sealing ring, and the second annular oil cavity is connected to the oil outlet of the valve seat and the through hole of the valve cover, respectively.

[0010] Furthermore, when the hydraulic lock is in working condition, hydraulic oil flows from the first port through the first oil circuit into the left control oil chamber. Under the pressure of the hydraulic oil, the first end of the main valve core in the left valve core assembly gradually moves to the left. At this time, the valve port of the main valve core in the left valve core assembly opens, the compression spring is compressed, and then the hydraulic oil in the first port can flow freely to the third port. At the same time, the left end face of the movable piston in the movable push rod is subjected to the pressure of the hydraulic oil, and the movable push rod gradually moves to the right. The right push rod on the movable push rod acts on the main valve core in the right valve core assembly. At this time, the valve port of the main valve core in the right valve core assembly opens, and then the fourth port connects with the second port, forming a hydraulic circuit from the first port to the third port and from the fourth port to the second port.

[0011] Furthermore, hydraulic oil from the cylinder load end connected to the hydraulic lock enters through the third port, flows through the valve seat inlet, and enters the annular oil circuit. The hydraulic oil acts on the second end of the main valve core in the left valve core assembly, pushing the main valve core to gradually move to the right. At this time, the main valve core's valve port closes, and the hydraulic lock enters the locked state. Subsequently, pressurized oil flows into the valve seat outlet, the second annular oil chamber, and the valve cover through-hole, acting on the output end of the left shuttle valve through the fourth branch oil circuit. Simultaneously, hydraulic oil from the cylinder load end acts on the first input end of the left shuttle valve through the first branch oil circuit, and hydraulic oil from the first return port acts on the second input end of the left shuttle valve through the fifth and third branch oil circuits. When the pressure at the third port of the hydraulic oil at the cylinder load end is greater than the pressure at the first return port, the hydraulic oil at the third port flows into the valve seat through the output end of the left shuttle valve. At this time, the hydraulic oil in the valve seat is connected to the third port of the cylinder load end. The position of the main valve core remains unchanged, and the hydraulic lock remains locked.

[0012] Furthermore, when the load end of the cylinder connected to the hydraulic lock is impacted, the oil pressure at the third port of the cylinder load end drops. When the oil pressure at the third port is less than that at the first return port, the second input end of the left shuttle valve is connected to the first return port. The oil pressure at the first end of the main valve core in the left valve core assembly is equal to the oil pressure at the first return port. At this time, the oil pressure at both ends of the main valve core is equal, the position of the main valve core remains unchanged, and the hydraulic lock remains locked.

[0013] Preferably, the valve body is further provided with multiple vertical oil passages running through the valve body.

[0014] The features and beneficial effects of this invention are:

[0015] 1. The present invention provides a superimposed deep-sea hydraulic lock, wherein the two ends of the movable push rod adopt a double push rod structure. When hydraulic oil enters the oil port on one side of the valve body, the movable push rod can move in the control oil chamber to open the main valve core valve port on one side. At the same time, a compression spring is used in the valve core assembly, and the main valve core can move along the valve seat under the action of hydraulic oil and compression spring to realize the opening or closing of the main valve core valve port.

[0016] 2. The present invention provides a superimposed deep-sea hydraulic lock, in which a shuttle valve is installed between the oil circuit connected to the load end of the cylinder and the first and second oil ports. When the hydraulic lock changes its working state, the valve ball in the shuttle valve moves to block the oil port connected to the load oil circuit, which does not affect the flow of oil in the hydraulic lock. During the hydraulic locking process, when the load end of the cylinder is subjected to external impact, the shuttle valve compares the oil pressure at both input ends to ensure the pressure balance of the large and small ends of the main valve core, thereby realizing the hydraulic lock maintaining the locking function and protecting the hydraulic components from hydraulic shock.

[0017] 3. The superimposed deep-sea hydraulic lock provided by this invention has a mature processing technology, a simple and compact structure, and improves the phenomenon of hydraulic lock locking failure caused by load end pressure changes. It has stable flow and reduces load end oscillation. Compared with traditional hydraulic locks, it has the advantages of low energy loss and good working reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the superimposed deep-sea hydraulic lock of the present invention;

[0019] Figure 2 This is a schematic diagram of the valve body of the present invention;

[0020] Figure 3 This is a cross-sectional view of the valve body of the present invention;

[0021] Figure 4 This is a top view of the valve body of the present invention;

[0022] Figure 5 This is the present invention. Figure 4 Sectional view along direction A;

[0023] Figure 6 This is the present invention. Figure 4 Sectional view along direction B;

[0024] Figure 7 This is a front view of the valve body of the present invention;

[0025] Figure 8 This is the present invention. Figure 7 Sectional view along line C;

[0026] Figure 9 This is the present invention. Figure 7 Sectional view along line C1;

[0027] Figure 10 This is the present invention. Figure 7 Sectional view along direction D;

[0028] Figure 11 This is the present invention. Figure 7 Sectional view from direction D1;

[0029] Figure 12 This is a bottom view of the valve body of the present invention;

[0030] Figure 13 This is the present invention. Figure 12 Sectional view along direction F;

[0031] Figure 14 This is a top view of the superimposed deep-sea hydraulic lock of the present invention;

[0032] Figure 15 This is the present invention. Figure 14 Sectional view along line G;

[0033] Figure 16 This is a hydraulic principle diagram of the superimposed deep-sea hydraulic lock of the present invention;

[0034] Figure 17 This is a partial hydraulic schematic diagram of the connection between the main valve core and the shuttle valve in this invention.

[0035] Key reference numerals:

[0036] Valve body 1; Control oil chamber 101; Left control oil chamber 1011; Right control oil chamber 1012; Left valve core chamber 102; Right valve core chamber 103; Movable push rod 2; Movable piston 21; Left push rod 22; Right push rod 23; Left valve core assembly 3; Valve seat 301; Valve seat inlet 3011; Valve seat outlet 3012; Main valve core port 3013; Main valve core 302; Compression spring 303; Valve cover 304; Valve cover through hole 3041; Spring support 305; Sealing ring 306; First annular oil chamber 307; Annular oil passage 308; Second annular oil chamber 309; Right valve core assembly 4; First oil passage 501; Third oil circuit 502; Second oil circuit 601; Fourth oil circuit 602; Fifth oil circuit 503; First branch oil circuit 5031; Second branch oil circuit 5032; Third branch oil circuit 5033; Fourth branch oil circuit 5034; Fifth branch oil circuit 5035; Left shuttle valve 504; Sixth oil circuit 603; Sixth branch oil circuit 6031; Seventh branch oil circuit 6032; Eighth branch oil circuit 6033; Ninth branch oil circuit 6034; Tenth branch oil circuit 6035; Right shuttle valve 604; First oil port A; Second oil port B; Third oil port A1; Fourth oil port B1; First return oil port T1; Second return oil port T2. Detailed Implementation

[0037] To fully describe the technical content, structural features, objectives, and effects of this invention, a detailed description will be provided below in conjunction with the accompanying drawings.

[0038] The present invention provides a superimposed deep-sea hydraulic lock, such as Figure 1 As shown, it includes a valve body 1, a movable push rod 2, and a left valve core assembly 3 and a right valve core assembly 4 installed at both ends of the valve body 1.

[0039] like Figures 2 to 13 As shown, the valve body 1 has a rectangular parallelepiped structure, and a control oil chamber 101 is provided in the middle of the valve body 1. The movable push rod 2 is located in the control oil chamber 101, dividing the control oil chamber 101 into a left control oil chamber 1011 and a right control oil chamber 1012. The valve body 1 is provided with multiple oil passages and multiple oil ports connected to the oil passages. The two ends above the control oil chamber 101 are symmetrically provided with a first oil passage 501 and a second oil passage 601. The first end of the first oil passage 501 is connected to... The first oil port A is connected, and the second end of the first oil passage 501 is connected to the left control oil chamber 1011. The first end of the second oil passage 601 is connected to the second oil port B, and the second end of the second oil passage 601 is connected to the right control oil chamber 1012. The two ends of the control oil chamber 101 are symmetrically provided with a left valve core cavity 102 and a right valve core cavity 103. The lower part of the left valve core cavity 102 and the right valve core cavity 103 are respectively provided with a third oil passage 502 and a fourth oil passage. 602, the first end of the third oil passage 502 is connected to the left valve core cavity 102, and the second end of the third oil passage 502 is connected to the third oil port A1. The fifth oil passage 503 is equipped with a left shuttle valve 504, and the first input end of the left shuttle valve 504 is connected to the third oil port A1, the second input end of the left shuttle valve 504 is connected to the first return oil port T1, and the output end of the left shuttle valve 504 is connected to the valve cover through hole 3041 on the valve cover 304 in the left valve core assembly 3. The first end of the fourth oil passage 602 is connected to the right valve core cavity 103, and the second end of the fourth oil passage 602 is connected to the fourth oil port B1. The sixth oil passage 603 is provided with a right shuttle valve 604, and the first input end of the right shuttle valve 604 is connected to the fourth oil passage 602. The second input end of the right shuttle valve 604 is connected to the second return oil port T2. The output end of the right shuttle valve 604 is connected to the valve cover through hole 3041 on the valve cover 304 in the right valve core assembly 4.

[0040] In a preferred embodiment, the valve body 1 is also provided with multiple vertical oil passages running through the valve body 1.

[0041] In a preferred embodiment, the fifth oil passage 503 includes a first branch oil passage 5031, a second branch oil passage 5032, a third branch oil passage 5033, a fourth branch oil passage 5034, and a fifth branch oil passage 5035. The first end of the first branch oil passage 5031 is connected to the middle of the third oil passage 502, and the second end of the first branch oil passage 5031 is connected to the first end of the third branch oil passage 5033 through the second branch oil passage 5032. A left shuttle valve 504 is provided in the middle of the third branch oil passage 5033, and the middle of the third branch oil passage 5033 is connected to the valve cover through hole 3041 on the valve cover 304 in the left valve core assembly 3 through the fourth branch oil passage 5034. The second end of the third branch oil passage 5033 is connected to the fifth branch oil passage 5035, and the fifth branch oil passage 5035 vertically penetrates the valve body 1. A first return oil port T1 is provided at the lower end of the fifth branch oil passage 5035.

[0042] In a preferred embodiment, the sixth oil passage 603 includes a sixth branch oil passage 6031, a seventh branch oil passage 6032, an eighth branch oil passage 6033, a ninth branch oil passage 6034, and a tenth branch oil passage 6035. The first end of the sixth branch oil passage 6031 is connected to the middle of the fourth oil passage 602, and the second end of the sixth branch oil passage 6031 is connected to the first end of the eighth branch oil passage 6033 through the seventh branch oil passage 6032. A right shuttle valve 604 is provided in the middle of the eighth branch oil passage 6033, and the middle of the eighth branch oil passage 6033 is connected to the valve cover through hole 3041 on the valve cover 304 in the right valve core assembly 4 through the ninth branch oil passage 6034. The second end of the eighth branch oil passage 6033 is connected to the tenth branch oil passage 6035, and the tenth branch oil passage 6035 vertically penetrates the valve body 1. A second return oil port T2 is provided at the lower end of the tenth branch oil passage 6035.

[0043] like Figure 14 and Figure 15 As shown, the movable push rod 2 includes a movable piston 21 and a left push rod 22 and a right push rod 23 disposed at both ends of the movable piston 21. The outer side wall of the movable piston 21 is in contact with the inner side wall of the control oil chamber 101. When the movable piston 21 is in the middle position, the left end face of the left push rod 22 is in contact with the end face of the main valve core 302 in the left valve core assembly 3, and the right end face of the right push rod 23 is in contact with the end face of the main valve core 302 in the right valve core assembly 4.

[0044] like Figure 14 and Figure 15As shown, the left valve core assembly 3 and the right valve core assembly 4 have identical structures, and both include a valve seat 301, a main valve core 302, a compression spring 303, a valve cover 304, and a spring support 305. The valve seat 301 is respectively disposed in the left valve core cavity 102 and the right valve core cavity 103, and multiple valve seat oil inlet holes 3011 and multiple valve seat oil outlet holes 3012 are evenly distributed on the outer side walls of the first and second ends of the valve seat 301. The main valve core 302 is disposed in the valve seat 301, and the main valve core 302 is disposed in the valve seat 301. The first end of 02 is in contact with the main valve core valve port 3013 at the first end of the valve seat 301. The outer wall of the valve cover 304 is provided with a valve cover through hole 3041. The valve cover 304 is respectively located in the left valve core cavity 102 and the right valve core cavity 103, and the second end of the valve cover 304 is located in the valve seat 301. The valve cover 304 and the valve seat 301 are sealed and connected by a sealing ring 306. The spring support 305 is located inside the valve cover 304, and a compression spring 303 is provided between the spring support 305 and the second end of the main valve core 302.

[0045] In a preferred embodiment, a first annular oil cavity 307 is formed between the valve seat 301, the valve cover 304, and the valve body 1, and the valve seat oil inlet 3011 is connected to the first annular oil cavity 307; the outer diameter of the main valve core 302 is smaller than the inner diameter of the valve seat 301, and an annular oil passage 308 is provided between the main valve core 302 and the valve seat 301; the outer diameter of the valve seat 301 is smaller than the inner diameter of the valve cover 304, and a second annular oil cavity 309 is formed between the valve seat 301, the valve cover 304, and the sealing ring 306, and the second annular oil cavity 309 is connected to the valve seat oil outlet 3012 and the valve cover through hole 3041, respectively.

[0046] The present invention provides a superimposed deep-sea hydraulic lock, such as Figures 1 to 17 As shown, the working process of the hydraulic lock is as follows:

[0047] (1) Working status

[0048] When the hydraulic lock is in working condition, hydraulic oil flows from the first port A through the first oil passage 501 into the left control oil chamber 1011. The first end of the main valve core 302 in the left valve core assembly 3 gradually moves to the left under the pressure of the hydraulic oil. At this time, the main valve core port 3013 in the left valve core assembly 3 opens, the compression spring 303 is compressed, and then the hydraulic oil in the first port A can flow freely to the third port A1. At the same time, the left end face of the movable piston 21 in the movable push rod 2 is subjected to the pressure of the hydraulic oil, and the movable push rod 2 gradually moves to the right. The right push rod 23 on the movable push rod 2 acts on the main valve core 302 in the right valve core assembly 4. At this time, the main valve core port 3013 in the right valve core assembly 4 opens, and then the fourth port B1 is connected to the second port B, forming a hydraulic circuit from the first port A to the third port A1 and from the fourth port B1 to the second port B.

[0049] Similarly, when oil enters through the second port B, a hydraulic circuit from A to A1 and from B to B1 is formed.

[0050] (2) Locked state

[0051] Hydraulic oil from the load end of the cylinder connected to the hydraulic lock enters through the third oil port A1, passes through the third oil passage 502 into the first annular oil chamber 307, flows through the valve seat inlet 3011 into the annular oil passage 308, and the hydraulic oil acts on the second end of the main valve core 302 in the left valve core assembly 3, pushing the main valve core 302 to gradually move to the right. At this time, the main valve core port 3013 of the main valve core 302 is closed, and then the pressure oil flows into the valve seat outlet 3012, the second annular oil chamber 309 and the valve cover through hole 3041, and acts on the output end of the left shuttle valve 504 through the fourth branch oil passage 5034. At the same time, the hydraulic oil from the load end of the cylinder acts on the first input end of the left shuttle valve 504 through the first branch oil passage 5031, and the hydraulic oil from the first return port T1 acts on the second input end of the left shuttle valve 504 through the fifth branch oil passage 5035 and the third branch oil passage 5033. When the pressure of the hydraulic oil at the load end of the cylinder at the third port A1 is greater than the pressure at the first return port T1, the hydraulic oil at the third port A1 flows into the valve seat 301 through the output end of the left shuttle valve 504. At this time, the hydraulic oil in the valve seat 301 is connected to the third port A1 at the load end of the cylinder. At this time, the position of the main valve core 302 remains unchanged, and the hydraulic lock remains locked.

[0052] When the load end of the cylinder connected to the hydraulic lock is impacted, the oil pressure at the third port A1 of the cylinder load end drops, and the second input end of the left shuttle valve 504 is connected to the first return port T1. When the oil pressure at the third port A1 is less than that at the first return port T1, the oil pressures at the two input ends of the left shuttle valve 504 are compared, so that the first return port T1 is connected to the output end of the left shuttle valve 504. The oil pressure at the first end of the main valve core 302 in the left valve core assembly 3 is equal to the oil pressure at the first return port T1. At this time, the oil pressures at both ends of the main valve core 302 are equal, the position of the main valve core 302 remains unchanged, and the hydraulic lock remains locked.

[0053] The movable push rod of this invention adopts a double push rod structure at both ends. When hydraulic oil enters through the oil port on one side of the valve body, the movable push rod can move in the control oil chamber, opening the main valve core port on one side. At the same time, a compression spring is used in the valve core assembly, and the main valve core can move along the valve seat under the action of hydraulic oil and compression spring, realizing the opening or closing of the main valve core port. Meanwhile, a shuttle valve is set between the oil circuit connected to the load end of the cylinder and the first and second oil ports. When the hydraulic lock changes its working state, the valve ball in the shuttle valve moves to block the oil port connected to the load oil circuit, which does not affect the flow of oil in the hydraulic lock. During the hydraulic locking process, when the load end of the cylinder is subjected to external impact, the shuttle valve compares the oil pressure at both input ends to ensure the pressure balance of the large and small ends of the main valve core, realizing the hydraulic lock maintaining the locking function, while protecting the hydraulic components from hydraulic shock. In addition, the phenomenon of hydraulic lock locking failure caused by load end pressure changes is eliminated. The flow is stable, and the oscillation at the load end is reduced. Compared with traditional hydraulic locks, it has the advantages of low energy loss and high reliability.

[0054] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A stacked deep-sea hydraulic lock, characterized in that, It includes a valve body, a movable push rod, and a left valve core assembly and a right valve core assembly mounted at both ends of the valve body. The valve body has a rectangular parallelepiped structure, and a control oil chamber is provided in the middle of the valve body. The movable push rod is located in the control oil chamber and divides the control oil chamber into a left control oil chamber and a right control oil chamber. The valve body is provided with multiple oil passages and multiple oil ports connected to the oil passages. A first oil passage and a second oil passage are symmetrically provided at both ends above the control oil chamber. The first end of the first oil passage is connected to the first oil port, and the second end of the first oil passage is connected to the left control oil chamber. The first end of the second oil passage is connected to the second oil port, and the second end of the second oil passage is connected to the right control oil chamber. A left valve core cavity and a right valve core cavity are symmetrically provided at both ends of the control oil chamber. A third oil passage and a fourth oil passage are respectively provided below the left valve core cavity and the right valve core cavity. The first end of the third oil passage is connected to the left valve core cavity. The fifth oil circuit is connected to the third oil port at its second end and the third oil circuit at its second end. The fifth oil circuit includes a left shuttle valve, with its first input end connected to the third oil port and its second input end connected to the first return oil port. The output end of the left shuttle valve is connected to the valve cover through-hole on the valve cover of the left valve core assembly. The first end of the fourth oil circuit is connected to the right valve core cavity, and its second end is connected to the fourth oil port. The sixth oil circuit includes a right shuttle valve, with its first input end connected to the fourth oil circuit and its second input end connected to the second return oil port. The output end of the right shuttle valve is connected to the valve cover through-hole on the valve cover of the right valve core assembly. The fifth oil circuit includes a first branch oil circuit, a second branch oil circuit, a third branch oil circuit, a fourth branch oil circuit, and a fifth branch oil circuit. The left and right valve core assemblies have identical structures, and each assembly includes a valve seat, a main valve core, a compression spring, a valve cover, and a spring support. The valve seats are respectively located in the left and right valve core cavities, and multiple valve seat oil inlets and outlets are evenly distributed on the outer walls of the first and second ends of the valve seats. The main valve core is located in the valve seat, and its first end is in contact with the main valve core valve port at the first end of the valve seat. The valve cover has a valve cover through hole on its outer wall, and the valve cover is respectively located in the left and right valve core cavities, with its second end located in the valve seat. The valve cover and the valve seat are sealed together by a sealing ring. The spring support is located inside the valve cover, and the compression spring is located between the spring support and the second end of the main valve core. A first annular oil cavity is formed between the valve seat, valve cover, and valve body, and the oil inlet of the valve seat is connected to the first annular oil cavity; the outer diameter of the main valve core is smaller than the inner diameter of the valve seat, and an annular oil passage is provided between the main valve core and the valve seat; the outer diameter of the valve seat is smaller than the inner diameter of the valve cover, and a second annular oil cavity is formed between the valve seat, valve cover, and sealing ring, and the second annular oil cavity is connected to the oil outlet of the valve seat and the through hole of the valve cover respectively; Hydraulic oil from the cylinder load end connected to the hydraulic lock enters through the third port, flows through the valve seat inlet, and enters the annular oil circuit. The hydraulic oil acts on the second end of the main valve core in the left valve core assembly, pushing the main valve core to gradually move to the right. At this time, the main valve core valve port closes, and the hydraulic lock enters the locked state. Subsequently, pressurized oil flows into the valve seat outlet, the second annular oil chamber, and the valve cover through hole, and acts on the output end of the left shuttle valve through the fourth branch oil circuit. At the same time, the hydraulic oil from the cylinder load end acts on the first input end of the left shuttle valve through the first branch oil circuit, and the hydraulic oil from the first return port acts on the second input end of the left shuttle valve through the fifth and third branch oil circuits. When the pressure of the hydraulic oil at the cylinder load end third port is greater than the pressure at the first return port, the hydraulic oil at the third port flows into the valve seat through the output end of the left shuttle valve. At this time, the hydraulic oil in the valve seat is connected to the cylinder load end third port. The position of the main valve core remains unchanged, and the hydraulic lock remains locked.

2. The superimposed deep-sea hydraulic lock according to claim 1, characterized in that, The movable push rod includes a movable piston and a left push rod and a right push rod disposed at both ends of the movable piston. The outer side wall of the movable piston is in contact with the inner side wall of the control oil chamber. When the movable piston is in the middle position, the left end face of the left push rod is in contact with the end face of the main valve core in the left valve core assembly, and the right end face of the right push rod is in contact with the end face of the main valve core in the right valve core assembly.

3. The superimposed deep-sea hydraulic lock according to claim 1, characterized in that, The first end of the first branch oil passage is connected to the middle of the third oil passage, and the second end of the first branch oil passage is connected to the first end of the third branch oil passage through the second branch oil passage. The left shuttle valve is provided in the middle of the third branch oil passage, and the middle of the third branch oil passage is connected to the valve cover through hole on the valve cover of the left valve core assembly through the fourth branch oil passage. The second end of the third branch oil passage is connected to the fifth branch oil passage, and the fifth branch oil passage vertically penetrates the valve body. The lower end of the fifth branch oil passage is provided with a first return oil port.

4. The superimposed deep-sea hydraulic lock according to claim 3, characterized in that, The sixth oil passage includes a sixth branch oil passage, a seventh branch oil passage, an eighth branch oil passage, a ninth branch oil passage, and a tenth branch oil passage. The first end of the sixth branch oil passage is connected to the middle of the fourth oil passage, and the second end of the sixth branch oil passage is connected to the first end of the eighth branch oil passage through the seventh branch oil passage. The right shuttle valve is provided in the middle of the eighth branch oil passage, and the middle of the eighth branch oil passage is connected to the valve cover through hole on the valve cover of the right valve core assembly through the ninth branch oil passage. The second end of the eighth branch oil passage is connected to the tenth branch oil passage, and the tenth branch oil passage vertically penetrates the valve body. The lower end of the tenth branch oil passage is provided with a second oil return port.

5. The superimposed deep-sea hydraulic lock according to claim 1, characterized in that, When the hydraulic lock is in working condition, hydraulic oil flows from the first port through the first oil circuit into the left control oil chamber. Under the pressure of the hydraulic oil, the first end of the main valve core in the left valve core assembly gradually moves to the left. At this time, the valve port of the main valve core in the left valve core assembly opens, the compression spring is compressed, and then the hydraulic oil in the first port can flow freely to the third port. At the same time, the left end face of the movable piston in the movable push rod is subjected to the pressure of the hydraulic oil, and the movable push rod gradually moves to the right. The right push rod on the movable push rod acts on the main valve core in the right valve core assembly. At this time, the valve port of the main valve core in the right valve core assembly opens, and then the fourth port is connected to the second port, forming a hydraulic circuit from the first port to the third port and a hydraulic circuit from the fourth port to the second port.

6. The superimposed deep-sea hydraulic lock according to claim 5, characterized in that, When the load end of the cylinder connected to the hydraulic lock is impacted, the oil pressure at the third port of the cylinder load end drops. When the oil pressure at the third port is less than the oil pressure at the first return port, the second input end of the left shuttle valve is connected to the first return port. The oil pressure at the first end of the main valve core in the left valve core assembly is equal to the oil pressure at the first return port. At this time, the oil pressure at both ends of the main valve core is equal, the position of the main valve core remains unchanged, and the hydraulic lock remains locked.

7. The superimposed deep-sea hydraulic lock according to claim 1, characterized in that, The valve body is also provided with multiple vertical oil passages running through it.

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