Underwater emergency electromechanical actuator

Abstract

The present invention relates to an electromechanical actuator, in particular to an underwater emergency electromechanical actuator. A shell is connected to a buffer-type sealing device. The buffer-type sealing control device includes a hydrophobic medium filled in the shell, and a pressure control device arranged in the shell. The arrangement is such that when the shell loses the hydrophobic medium, the pressure control device drives the hydrophobic medium to be replenished to the loss location. Since the shell needs to be sealed at multiple locations, the seals usually use sealing rings, sealing bearings, oil seals and other structures, and it is difficult to determine where a leak occurs. The buffer-type sealing device can simultaneously control the pressure of the hydrophobic medium at any sealing position, and replenish the pressure in real time when a leak occurs, thereby achieving a dynamic sealing effect at any time.

Description

Technical Field

[0001] The invention relates to an electromechanical actuator, in particular to an underwater emergency electromechanical actuator. Background Art

[0002] In recent years, the ocean and lake sectors have experienced rapid development, leading to an increasing number of underwater operations, exploration, mining, and construction. In particular, some situations require underwater work, posing a significant safety challenge to both equipment and personnel. The underwater environment is complex and presents risks of water pressure and leaks. Therefore, the safety of equipment and personnel in the event of an accident or emergency must be considered.

[0003] The underwater emergency electromechanical actuator has the characteristics of good insulation, strong water pressure resistance, and reliable sealing. It has its own power supply and operating system. When the system fails, it can serve as a backup for emergency actions, such as emergency action switches and emergency cutting of underwater cables.

[0004] The existing underwater emergency electromechanical actuator includes a shell, in which a telescopic device is arranged, the end of the telescopic device extends outward through the shell, the end of the telescopic device is slidingly sealed with the shell, the telescopic device is connected to a drive device, and the drive device is connected to a power supply. The telescopic device is generally an oil cylinder, and the drive device is a hydraulic station, which is sealed by redundant sealing to prevent water from entering the shell. Due to the large sealing area, the entire cylinder is elastically deformed by the water pressure underwater. When the water depth changes, that is, the water pressure changes, the elastic body recovery process easily sucks water into the shell, increasing the risk of water leakage. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an underwater emergency electromechanical actuator that can supplement a hydrophobic medium to a sealing position and thereby block water from leaking positions.

[0006] The present invention is achieved through the following technical solutions: an underwater emergency electromechanical actuator, comprising a shell, a telescopic device arranged in the shell, the end of the telescopic device extending outward through the shell, the end of the telescopic device and the shell being slidingly sealed, the telescopic device being connected to a driving device, the driving device being connected to a power supply, the shell being connected to a buffer-type sealing control device, the buffer-type sealing control device comprising a hydrophobic medium filled in the shell, and a pressure control device arranged in the shell, which is configured so that when the shell loses hydrophobic medium, the pressure control device drives the hydrophobic medium to replenish the loss location.

[0007] Furthermore, the telescopic device includes a telescopic sleeve, the telescopic sleeve is slidably and sealedly connected to the shell, the telescopic sleeve is connected to a push rod, and the push rod is connected to the driving device.

[0008] Furthermore, the telescopic sleeve is threadedly connected to the push rod, a guide key is provided on the outside of the telescopic sleeve, and a sliding groove matched with the guide key is provided on the shell.

[0009] Furthermore, the hydrophobic medium is 320# gear lubricating oil.

[0010] Furthermore, the pressure control device includes an expansion body arranged in the housing, and is configured to expand when a pressure drop in the housing is detected.

[0011] Furthermore, the expansion body is an airbag, and the airbag is made of rubber material.

[0012] Furthermore, the airbag is communicated with the outside of the shell.

[0013] The beneficial effects of the present invention are: the underwater emergency electromechanical actuator, the shell is connected to a buffer-type sealing control device, the buffer-type sealing control device includes a hydrophobic medium filled in the shell, and a pressure control device arranged in the shell, which is configured so that when the shell loses hydrophobic medium, the pressure control device drives the hydrophobic medium to replenish the loss location. Since the shell needs to be sealed at multiple locations, the seals usually use sealing rings, sealing bearings, oil seals and other structures, and it is difficult to determine where the leakage occurs. Through the buffer-type sealing control device, the pressure of the hydrophobic medium at any sealing position can be controlled at the same time, and it can be replenished in real time when leakage occurs, thereby achieving the effect of dynamic sealing at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of Example 1;

[0015] Figure 2 This is a schematic front cross-sectional view of Example 1;

[0016] Figure 3 Schematic diagram of the transmission mechanism structure;

[0017] Figure 4 This is a schematic diagram of the main cross-section of the upper cover;

[0018] Figure 5 It is a schematic diagram of a top view of the shell;

[0019] Figure 6 This is a schematic diagram of the integrated ball screw pair structure;

[0020] Figure 7 Schematic diagram of the lug structure.

[0021] Among them: 1. Housing; 2. Upper cover; 3. Accumulator; 4. Integrated ball screw pair; 5. Support lug; 6. One-way valve; 7. Underwater motor; 8. Gearbox; 9. Mounting plate; 10. Large gear; 11. Round nut 1; 12. Deep groove ball bearing; 13. Small gear; 14. Round nut 2; 15. Thrust bearing; 16. Gearbox housing; 17. Enclosed drive and power supply; 18. Pressure plate; 19. Vulcanized cable; 21. Upper cover sealing ring; 22. Accumulator sealing ring; 23. Dust seal; 24. Gly ring; 25. Wear-resistant ring; 26. One-way valve sealing ring; 28. Spherical bearing; 29. Mounting plate connector; 30. Guide keyway; 31. Integrated nut; 32. Screw; 33. Guide key. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figure 1-7As shown, an underwater emergency electromechanical actuator includes a shell 1, a main load-bearing component, which is processed by die forging. In order to reduce the sealing position, the lower part is sealed. The upper end of the shell 1 is sealed with an upper cover plate 2, and an upper cover plate sealing ring 21 is installed between the upper cover plate and the shell. A telescopic device is installed in the shell 1, and the end of the telescopic device extends outward through the shell 1. The end of the telescopic device is slidably and sealedly connected to the shell 1. The telescopic device is connected to a drive device, and the drive device is connected to a power supply. Specifically, the telescopic device includes a telescopic sleeve, and the telescopic sleeve is slidably and sealedly connected to the shell. , the telescopic sleeve is connected to a push rod, the push rod is connected to the driving device, the telescopic sleeve and the push rod are threadedly connected, a guide key is provided on the outside of the telescopic sleeve, and a slide groove that cooperates with the guide key is provided on the housing 1. More specifically, the telescopic device of this embodiment uses an integrated ball screw pair 4, the push rod is a screw 32, the telescopic sleeve is an integrated nut 31, a guide key 33 is machined on the outer wall of the integrated nut, and a slide groove that cooperates with the guide key is machined on the side wall of the housing 1, thereby limiting the circular motion of the integrated nut, thereby converting the rotational motion into linear motion, and a water pump with a gear box is installed in the housing. The lower motor 7 is installed with a mounting plate 9 at the bottom of the housing 1 through a mounting plate connecting seat 29. The mounting plate connecting seat and the housing are integrally formed. The gear box and the screw are transmitted through a transmission module installed on the mounting plate. The transmission module includes a thrust bearing mounting hole installed on the mounting plate, and a pair of thrust bearings 15 are installed relative to the integrated ball screw pair to withstand axial force. The driving end of the integrated ball screw pair uses a round nut 14 to axially fix the large gear to the integrated ball screw pair 4. The underwater motor 7 and the gear box 8 are fixed to the mounting plate by bolts, using a round nut. A nut 11 fixes the large gear 10. There is a small gear 13 between the underwater motor, the gearbox and the integrated ball screw pair. Deep groove ball bearings 12 are installed on both sides, one side is located in the mounting plate, and the other side is located inside the gearbox housing 1. The mounting plate is fixed to the inside of the housing 1 by bolts, and the gearbox housing 1 is fixed to the back of the mounting plate by bolts, isolating the large gear and small gear from other parts to prevent metal debris from entering other parts during operation, and supporting and fixing the small gear and protecting the gear pair. The gearbox housing is also connected to the mounting plate to protect the gear.

[0026] In order to achieve better sealing, a hole is opened in the middle of the upper cover plate 2 to match the integrated ball screw pair. The working end of the integrated ball screw pair passes through the hole outward and is connected to a lug 5. The lug is used to connect to the actuator. A joint bearing 28 is installed in the lug, which can adapt to the angle of the transmission rod. A dust ring 23, a gray ring 24, and a wear-resistant ring 25 are installed inside in sequence. The dust ring prevents large particles and impurities from entering the interior of the underwater emergency electromechanical actuator and between the upper cover plate 2 and the nut, contaminating the internal hydrophobic medium and causing internal The nut surface is not stuck or scratched. The Gly ring plays a sealing role, isolating the ambient water from the internal hydrophobic medium. The wear-resistant ring contacts the nut surface and plays a supporting and guiding role in the nut. One side of the upper cover plate 2 is the accumulator 3 mounting platform, and the other side is the one-way valve mounting platform. Both surfaces are provided with O-ring mounting grooves. The upper cover plate 2 is connected to the shell 1 by bolts. A one-way valve 6 is installed at the one-way valve mounting platform, which can then be filled with hydrophobic medium after assembly. It can also control the pressure stability in the shell to avoid overpressure and ensure a certain positive pressure.

[0027] The housing 1 is connected to a buffer-type sealing control device. This device includes a hydrophobic medium filled within the housing 1 and a pressure control device mounted within the housing 1. When the housing 1 loses the hydrophobic medium, the pressure control device drives the hydrophobic medium to replenish the loss. Specifically, the hydrophobic medium is 320# gear lubricant. The pressure control device includes an expansion body mounted within the housing 1, configured to expand upon detecting a decrease in pressure within the housing 1. The expansion body is an airbag made of a rubber material, specifically nitrile butadiene rubber, with a wall thickness of 8-10mm, providing a high degree of elasticity. The airbag occupies 1 / 10 of the volume of the housing 1, providing a good buffer volume. The airbag is connected to the exterior of the housing 1, and the airbag pressure is replenished by water pressure. The airbag forms an accumulator 3 structure, which slowly releases pressure during use, thereby squeezing the hydrophobic medium to the loss point. This achieves a dynamic sealing effect at any time. An accumulator 3 connection seat is integrally formed at the lower end of the upper cover 2. An accumulator seal 22 is mounted at the accumulator 3 connection seat to enhance the seal. A one-way valve mounting plate is also processed on the upper cover plate 2, and a one-way valve sealing ring 26 is provided at the one-way valve mounting plate. The one-way valve is installed. After the assembly is completed, 320# gear lubricating oil is filled into the housing 1 through the one-way valve inlet to lubricate the large gear, small gear, and integrated ball screw pair.

[0028] The underwater emergency electromechanical actuator provided in this embodiment has a closed driver and power supply 17 installed in the shell to achieve independent operation. The driver and power supply are sealed and packaged in a sheet metal box to achieve a higher waterproof effect. It is electrically connected to the controller through a vulcanized cable 19 to control and maintain the voltage. When the power supply is detected, it is charged in time. Since it is an emergency electromechanical actuator, the number of actions to be completed is small. Some equipment only needs to complete one action. The required power is low and the corresponding power supply is small in size. The underwater motor uses a servo motor, and the controller is a servo controller corresponding to the servo motor. It is driven by the servo motor and has high movement accuracy. An installation groove for installing the closed driver and power supply is integrally formed at the bottom of the shell. After the closed driver and power supply are placed in the installation groove, they are fixed at the upper end by a pressure plate 18 to complete the installation.

[0029] In this embodiment, the housing is integrally forged and subjected to high-pressure sealing testing, and has high sealing performance.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An underwater emergency electromechanical actuator, comprising a housing, a telescopic device disposed within the housing, a distal end of the telescopic device extending outward through the housing, a sliding and sealing connection between the distal end of the telescopic device and the housing, a drive device connected to the telescopic device, and a power supply connected thereto, characterized in that: The housing is connected to a buffer-type sealing control device, which includes a hydrophobic medium filled in the housing and a pressure control device arranged in the housing. The device is configured such that when the housing loses the hydrophobic medium, the pressure control device drives the hydrophobic medium to replenish the loss location. The pressure control device includes an expansion body arranged in the housing, and is configured to expand when a pressure drop in the housing is detected. The expansion body is an airbag made of rubber material. The airbag is in communication with the outside of the housing.

2. The underwater emergency electromechanical actuator according to claim 1, characterized in that: The telescopic device comprises a telescopic sleeve, the telescopic sleeve is slidably and sealedly connected to the shell, the telescopic sleeve is connected to a push rod, and the push rod is connected to the driving device.

3. The underwater emergency electromechanical actuator according to claim 2, characterized in that: The telescopic sleeve is threadedly connected to the push rod, a guide key is provided on the outside of the telescopic sleeve, a sliding groove matched with the guide key is provided on the shell, and the driving device drives the push rod to rotate.

4. The underwater emergency electromechanical actuator according to claim 1, characterized in that: The hydrophobic medium is 320# gear lubricating oil.

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