CN109356906B - Integrated electro-hydraulic actuator capable of being used for underwater operation - Google Patents
Integrated electro-hydraulic actuator capable of being used for underwater operation Download PDFInfo
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- CN109356906B CN109356906B CN201811474168.0A CN201811474168A CN109356906B CN 109356906 B CN109356906 B CN 109356906B CN 201811474168 A CN201811474168 A CN 201811474168A CN 109356906 B CN109356906 B CN 109356906B
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 31
- 238000002955 isolation Methods 0.000 claims abstract description 26
- 239000010985 leather Substances 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 162
- 239000013535 sea water Substances 0.000 claims description 13
- 239000012208 gear oil Substances 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 238000003902 seawater pollution Methods 0.000 abstract description 2
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B2015/206—Combined actuation, e.g. electric and fluid actuated
Abstract
The invention provides an integrated electro-hydraulic actuator for underwater operation, relates to the technical field of electro-hydraulic actuators, can resist corrosion and seawater pollution, and is a closed loop electro-hydraulic actuator with simple and compact structure and reliable operation; the electrohydraulic actuator comprises a first cylinder body and a second cylinder body which are connected in a sealing way; a piston device is arranged in the first cylinder body; a motor, a bidirectional oil pump and an oil tank are arranged in the second cylinder body; the bidirectional oil pump, the rod cavity and the rodless cavity of the first cylinder body and the oil tank form an oil circulation pipeline; the outer periphery of the overhanging part of the piston device is provided with a telescopic isolation leather bag. The technical scheme provided by the invention is suitable for the underwater operation process of the electro-hydraulic actuator.
Description
[ field of technology ]
The invention relates to the technical field of electrohydraulic actuators, in particular to an integrated electrohydraulic actuator capable of being used for underwater operation.
[ background Art ]
The deep sea working environment has the characteristics of low temperature, high pressure, easy corrosion and rich microorganisms, and three problems are easy to occur when the electro-hydraulic actuator system works in the deep sea environment. Firstly, due to the high environmental pressure in the deep sea, sealing failure is easy to cause, seawater and microorganisms enter a hydraulic system to pollute hydraulic oil, and serious consequences are caused; secondly, the piston rod is required to extend out of the hydraulic cylinder when in work, and the outer surface of the piston rod is exposed in seawater and is easy to corrode; thirdly, the common electrohydraulic actuator system is of an open structure, the hydraulic valve is used for controlling the action of the oil cylinder, and the dynamic performance of the hydraulic valve is obviously influenced due to the increase of the viscosity of hydraulic oil in a deep sea environment, so that the performance of the electrohydraulic actuator system is influenced.
Aiming at the first problem, the current measures are to set a pressure compensator to ensure that the internal pressure of the hydraulic system is equal to or slightly higher than the deep sea environmental pressure, so that seawater cannot enter the hydraulic system, but the hydraulic system with the pressure compensator still needs to pay attention to the dynamic performance of the system, so that the piston rod of the hydraulic cylinder is prevented from retracting too fast, the pressure compensator is not in response, and the instantaneous low pressure (lower than the deep sea environmental pressure) occurs in a rod cavity, so that the seawater enters the hydraulic system.
Aiming at the second problem, the prior solution has two ideas, namely, the piston rod is made of special corrosion-resistant steel, and the surface of the piston rod is coated with a special wear-resistant and corrosion-resistant coating (such as a ceramic coating). These considerations result in significant increases in the cost of the hydraulic ram. As mentioned in Chinese patent No. 106351910A, the corrosion-resistant cylinder of watertight door adopts Ni-Gr double-layer plating process to prevent seawater from corroding the piston rod; the marine oil cylinder with the anti-corrosion structure, which is mentioned in the Chinese patent No. 205937292U, adopts an anti-corrosion layer formed by coagulation of epoxy resin and an iron wire woven net, so that the metal surface of the cylinder body is isolated from seawater, and the hydraulic oil cylinder is prevented from being corroded by the seawater.
Aiming at the third problem, chinese patent CN102003432A mentions an electrohydraulic actuator, adopts a valve box assembly, realizes control by a controller, and has short and thick appearance and loose structure; chinese patent CN207246278U proposes a motor direct-drive clutch electrohydraulic control mechanism, which consists of a mechanical assembly and an electric control assembly, but has a narrow application range, and is especially not suitable for closed-loop control of a single-acting cylinder.
[ invention ]
In view of the above, the invention provides an integrated electro-hydraulic actuator which can be used for underwater operation, can resist corrosion and seawater pollution, and is a closed-loop electro-hydraulic actuator with simple and compact structure and reliable operation.
In one aspect, the invention provides an integrated electro-hydraulic actuator for underwater operation, which is characterized by comprising a first cylinder body and a second cylinder body which are connected in a sealing manner; a piston device is arranged in the first cylinder body; a motor, a bidirectional oil pump and an oil tank are arranged in the second cylinder body;
the bidirectional oil pump, the rod cavity and the rodless cavity of the first cylinder body and the oil tank form an oil circulation pipeline;
the periphery of the overhanging part of the piston device is provided with a telescopic and elastic isolation leather bag.
In accordance with aspects and any one of the possible implementations described above, there is further provided an implementation, the bi-directional oil pump including a first bi-directional fixed-weight gear oil pump and a second bi-directional fixed-weight gear oil pump; by a means ofDisplacement V of first bidirectional quantitative gear oil pump 1 Displacement V of the second bidirectional fixed gear oil pump 2 Effective area A of rodless cavity of the first cylinder 1 And an effective area A of the rod cavity of the first cylinder body 2 Satisfy the relation
Aspects and any possible implementation manner as described above further provide an implementation manner, where the specific communication manner of the oil circulation pipeline is: the first oil port of the bidirectional oil pump is communicated with the rod cavity; the second oil port of the bidirectional oil pump is communicated with the oil tank; the third oil port of the bidirectional oil pump is communicated with the rodless cavity; the rod cavity is communicated with the oil tank.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, wherein the specific manner in which the first oil port is communicated with the rod cavity is: the first oil duct, the first oil duct and the second oil duct are communicated in sequence; the first oil passage and the second oil passage are arranged on the cylinder wall of the first cylinder body, and the first oil pipe is arranged outside the first cylinder body.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where the rod cavity is communicated with the oil tank in a specific manner, and the rod cavity is communicated sequentially through a third oil duct provided on a cavity wall of the rod cavity, a second oil duct provided outside the first cylinder body and the second cylinder body, and a fourth oil duct provided on a tank wall of the oil tank.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner in which a hydraulic working medium is filled between the isolation bellows and a piston rod of the piston device.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, in which the bidirectional oil pump is disposed at an end of the second cylinder near the first cylinder; the motor is arranged adjacent to the bidirectional oil pump.
In aspects and any one of the possible implementations described above, there is further provided an implementation in which the outer end of the piston rod protrudes out of the first cylinder through an end cap provided at an outer end of the first cylinder.
Compared with the prior art, the invention can obtain the following technical effects: the isolation leather bag is adopted, so that the piston rod can be isolated from the external environment, the piston rod is protected from being corroded by seawater, the pressure compensator can be used, an independent pressure compensation device is omitted, and convenience is provided for realizing a closed loop of a single piston rod hydraulic cylinder; the electro-hydraulic actuator is changed from a short type to a long type, and can be suitable for various environments; the closed loop structure is adopted, the structure is compact, the installation is easy, and meanwhile, the influence of the hydraulic valve on the system performance in the deepwater environment is avoided.
Of course, it is not necessary for any of the products embodying the invention to achieve all of the technical effects described above at the same time.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an integrated electro-hydraulic actuator according to one embodiment of the present invention;
FIG. 2 is a schematic perspective view of an integrated electro-hydraulic actuator according to one embodiment of the present invention;
FIG. 3 is a schematic system diagram of an integrated electro-hydraulic actuator according to one embodiment of the present invention.
Wherein, in the figure:
a motor-1; a bidirectional oil pump-2; a first oil port-2.1; the second oil port is 2.2 and the third oil port is 2.3; isolating the leather bag-3; a piston rod-4; gear-5; a first cylinder; 6, preparing a base material; a second cylinder 7; a first oil pipe-8.1; a second oil pipe-8.2; an oil tank-9; a first oil passage-10; a second oil passage-11; a third oil passage-12; a fourth oil passage-13; a piston-14; motor line-15.
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
FIG. 1 is a schematic diagram of an integrated electro-hydraulic actuator according to one embodiment of the present invention;
fig. 2 is a schematic perspective view of an integrated electro-hydraulic actuator according to an embodiment of the present invention. As shown in fig. 1-2, a hydraulic ram suitable for use in a deep sea work environment comprises two steel cylinders, a first cylinder 6 and a second cylinder 7. The first cylinder 6 and the second cylinder 7 are connected in a sealing manner. Wherein the first cylinder body 6 is used as a single-acting hydraulic cylinder; the second cylinder 7 serves as an oil tank 9, and serves as a container for accommodating the motor 1 and a three-port bi-directional oil pump 2. The outer end of the first cylinder 6 (i.e. the end remote from the second cylinder 7) is provided with an end cap which is in sealing connection with the first cylinder 6. A piston rod 4 is arranged in the first cylinder body 6, one end of the piston rod 4 is fixedly connected with a piston 14, and the other end extends out of the first cylinder body 6 from a through hole arranged in the middle of the end cover. The piston rod 4 is sealed with the hole by a sealing element, the periphery of the piston 14 is also sealed with the inner wall of the first cylinder body by a sealing element, and leakage can not occur in the movement process of the piston rod.
The outer extending piston rod 4 is wrapped with a folding flexible isolation leather bag 3, one end of the isolation leather bag 3 is arranged on an end cover of a hydraulic cylinder (namely a first cylinder body), and the other end of the isolation leather bag 3 is arranged at the end part of the piston rod 4 in a sealing way, so that seawater cannot enter the isolation leather bag. The isolation leather bag 3 is made of modified silicon rubber, has good elasticity, stable property and seawater corrosion resistance, and adopts a folding structure with a metal framework. When the piston rod 4 moves, the isolation leather bag can freely stretch and retract, and the outer surface of the piston rod 4 is always isolated from seawater. The hydraulic working medium is filled between the outer surfaces of the isolation leather bag 3 and the piston rod 4, and as the isolation leather bag 3 has good elasticity and the effective action areas of the two oil pump discharge volumes and the two oil cylinders are matched, the pressure in the isolation leather bag is always higher than the deep sea environmental pressure in the movement process of the piston rod, the isolation leather bag is not damaged by the excessive pressure, and the dual functions of isolation and pressure compensation are achieved.
The second cylinder 7 is internally provided with a motor 1 and a bidirectional oil pump 2, the bidirectional oil pump 2 is arranged at one end of the second cylinder 7 close to the first cylinder, and the motor 1 is closely adjacent to the bidirectional oil pump 2. The bidirectional oil pump 2 is provided with three oil ports, namely a first oil port 2.1, a second oil port 2.2 and a third oil port 2.3. The first oil port 2.1 and the second oil port 2.2 are arranged at the upper part of the bidirectional oil pump 2, the third oil port 2.3 is arranged at one side of the bidirectional oil pump 2 near the first cylinder 7, and the third oil port 2.3 is communicated with the rodless cavity of the first cylinder.
Two oil pipes, namely a first oil pipe 8.1 and a second oil pipe 8.2, are arranged outside the cylinder body. The first oil pipe 8.1 is used for connecting the rod cavity of the first cylinder body 6 with the first oil port 2.1 of the three-port oil pump, and the second oil pipe 8.2 is used for connecting the isolation leather bag 3 with the inside of the second cylinder body 7. In this way the isolation bellows acts as a pressure compensator to equalize the pressure between the internal oil and the external seawater.
FIG. 3 is a schematic system diagram of an integrated electro-hydraulic actuator according to one embodiment of the present invention. As shown in fig. 3, the three-port oil pump is a combined structure of two bidirectional quantitative gear oil pumps, and has three oil ports, namely a first oil port 2.1, a second oil port 2.2 and a third oil port 2.3, wherein the first oil port 2.1 is connected with a rod cavity of the single-acting hydraulic cylinder, the second oil port 2.2 is connected with a closed oil cylinder, and the third oil port 2.3 is connected with a rodless cavity of the single-acting hydraulic cylinder.
Let the displacement of the left oil pump (i.e. the oil pump near the motor end) be V 1 The displacement of the right oil pump (i.e. the oil pump communicated with the rodless cavity) is V 2 The effective area (namely the piston area) of the rodless cavity of the oil cylinder is A 1 The effective area of the rod cavity (namely the sectional area of the annular cavity between the inner wall of the cylinder barrel and the outer wall of the piston rod) is A 2 When the rotation speed of the motor is n, the movement speed of the oil cylinder is V, the sealing work is reliable and no leakage exists everywhere, and the input/output flow of the first oil port 2.1 of the oil pump is n.V 2 The output/input flow of the third oil port is n (V 1 +V 2 ) The input/output flow of the rodless cavity of the oil cylinder is v.A 1 The output/input flow of the rod cavity is v.A 2 When the relation (1) and the relation (2) are satisfied, a closed circuit can be directly formed by connecting the hydraulic oil pump and the single-acting hydraulic cylinder without using a hydraulic valve.
The relation (1) is specifically:
n·(V 1 +V 2 )＝v·A 1 (1)
the relation (2) is specifically:
n·V 2 ＝v·A 2 (2)
the relation (1) and the relation (2) can be equivalently expressed as the relation (3):
therefore, the displacement of the two oil pumps, the effective areas of the rod cavity and the rodless cavity meet the relation formula (3), so that the integrated electro-hydraulic actuator can directly form a closed loop with the single-acting hydraulic cylinder through the hydraulic oil pump without using a hydraulic valve.
The displacement of the two oil pumps and the effective areas of the rod cavity and the rodless cavity of the integrated electro-hydraulic actuator are set to meet the relation (3), so that the integrated electro-hydraulic actuator is not provided with a hydraulic valve.
When the oil is injected before use, the isolation leather bag is in an expanded state, namely, the internal oil pressure is slightly higher than the atmospheric pressure.
When the piston rod 4 stretches out, the motor 1 drives the gear 5 to rotate positively, the first oil port 2.1 and the second oil port 2.2 are oil suction ports, and the third oil port 2.3 is an oil discharge port. At this time, the second oil port 2.2 absorbs oil from the oil tank 9; the oil in the rod cavity of the first cylinder body 6 sequentially flows through the second oil duct 11, the first oil duct 8.1 and the first oil duct 10 to the first oil port 2.1; and the third oil port 2.3 discharges oil to the rodless cavity. Along with the extension of the piston rod 4, the isolation leather bag 3 extends, and the oil in the isolation leather bag sequentially flows through the third oil duct 12, the second oil duct 8.2 and the fourth oil duct 13 to the oil tank 9, so that a closed cycle is completed. In this process, the isolation bellows 3 completes the tank refill.
When the piston rod 4 is retracted, the motor 1 drives the gear 5 to rotate reversely, the first oil port 2.1 and the second oil port 2.2 are oil discharge ports, and the third oil port 2.3 is an oil suction port. At the moment, the third oil port 2.3 sucks oil in the rodless cavity; the second oil port 2.2 discharges liquid to the oil tank 9; the oil discharged from the first oil port 2.1 sequentially flows through the first oil duct 10, the first oil duct 8.1 and the second oil duct 11 to enter the rod cavity; with the retraction of the piston rod 4, the isolation bellows 3 is folded and contains excess oil from the oil tank.
When the device works in an underwater environment, the isolation leather bag plays a role of a pressure compensator besides the role, and can isolate the piston rod from the external environment so as to protect the piston rod from corrosion.
The electrohydraulic actuator designed by the invention has the overall appearance basically the same as that of a common oil cylinder, and has compact structure and easy installation.
The integrated electro-hydraulic actuator provided by the embodiment of the application can be used for underwater operation, and is described in detail. The above description of embodiments is only for aiding in understanding the method of the present application and its core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth the preferred embodiment for carrying out the present application, but is not intended to limit the scope of the present application in general, for the purpose of illustrating the general principles of the present application. The scope of the present application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that this application is not limited to the forms disclosed herein, but is not to be construed as an exclusive use of other embodiments, and is capable of many other combinations, modifications and environments, and adaptations within the scope of the teachings described herein, through the foregoing teachings or through the knowledge or skills of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.
Claims (4)
1. An integrated electro-hydraulic actuator for underwater operation, which is characterized by comprising a first cylinder body (6) and a second cylinder body (7) which are connected in a sealing way; a piston device is arranged in the first cylinder body (6); a motor (1), a bidirectional oil pump (2) and an oil tank (9) are arranged in the second cylinder body (7); the bidirectional oil pump (2), the rod cavity and the rodless cavity of the first cylinder body (6) and the oil tank (9) form an oil circulation pipeline; the periphery of the overhanging part of the piston device is provided with a telescopic and elastic isolation leather bag (3);
the bidirectional oil pump (2) comprises a first bidirectional quantitative gear oil pump and a second bidirectional quantitative gear oil pump; the displacement V of the first bidirectional quantitative gear oil pump 1 Displacement V of the second bidirectional fixed gear oil pump 2 The effective area A1 of the rodless cavity of the first cylinder (6) and the effective area A2 of the rod cavity of the first cylinder (6) satisfy the relation；
The concrete communication mode of the oil liquid circulation pipeline is as follows: a first oil port (2.1) of the bidirectional oil pump (2) is communicated with the rod cavity; a second oil port (2.2) of the bidirectional oil pump (2) is communicated with the oil tank (9); a third oil port (2.3) of the bidirectional oil pump (2) is communicated with the rodless cavity; the rod cavity is communicated with the oil tank (9);
the concrete mode of the first oil port (2.1) communicated with the rod cavity is as follows: the first oil duct (10), the first oil duct (8.1) and the second oil duct (11) are communicated in sequence; the first oil duct (10) and the second oil duct (11) are arranged on the cylinder wall of the first cylinder body (6), and the first oil duct (8.1) is arranged outside the first cylinder body (6);
the concrete mode of the communication between the rod cavity and the oil tank (9) is that the rod cavity is communicated with a third oil duct (12) arranged on the cavity wall of the rod cavity, a second oil duct (8.2) arranged outside the first cylinder body (6) and the second cylinder body (7) and a fourth oil duct (13) arranged on the tank wall of the oil tank (9) in sequence; the first oil pipe (8.1) is used for connecting a rod cavity of the first cylinder body (6) with the first oil port (2.1) of the bidirectional oil pump (2), and the second oil pipe (8.2) is used for connecting the isolation leather bag (3) with the inside of the second cylinder body (7); the isolation bellows (3) acts as a pressure compensator to balance the pressure between the internal oil and the external seawater.
2. Integrated electro-hydraulic actuator for underwater operations according to claim 1, characterized in that the hydraulic working medium is filled between the isolating bellows (3) and the piston rod (4) of the piston device.
3. The integrated electro-hydraulic actuator usable for underwater operations according to any one of claims 1 or 2, characterized in that said bi-directional oil pump (2) is arranged at one end of said second cylinder (7) close to said first cylinder (6); the motor is arranged adjacent to the bidirectional oil pump (2).
4. The integrated electro-hydraulic actuator for underwater operations according to claim 2, characterized in that the outer end of the piston rod (4) protrudes out of the first cylinder (6) through an end cap provided at the outer end of the first cylinder (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811474168.0A CN109356906B (en) | 2018-12-04 | 2018-12-04 | Integrated electro-hydraulic actuator capable of being used for underwater operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811474168.0A CN109356906B (en) | 2018-12-04 | 2018-12-04 | Integrated electro-hydraulic actuator capable of being used for underwater operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109356906A CN109356906A (en) | 2019-02-19 |
| CN109356906B true CN109356906B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811474168.0A Active CN109356906B (en) | 2018-12-04 | 2018-12-04 | Integrated electro-hydraulic actuator capable of being used for underwater operation |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112983930A (en) * | 2021-02-07 | 2021-06-18 | 中国船舶科学研究中心 | Underwater single-action electro-hydraulic actuator and actuating method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105937514A (en) * | 2016-06-28 | 2016-09-14 | 华中科技大学无锡研究院 | Energy storage type electrohydraulic actuator for spherical pump |
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| US20070157612A1 (en) * | 2006-01-10 | 2007-07-12 | Xinhua He | Compact hydraulic actuator system |
| EP3896314B1 (en) * | 2014-10-06 | 2024-03-27 | Project Phoenix, LLC | Linear actuator assembly and system |
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| CN109356906A (en) | 2019-02-19 |
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