An underwater blowout preventer

Abstract

The present application relates to the technical field of blowout preventer, and discloses an underwater blowout preventer, which comprises a support connected with a connecting pipe extending in the up-down direction, and a blowout preventer assembly comprising a first electric drive source and a gate plate, wherein the first electric drive source is provided with a plurality of first electric drive sources arranged along the outer periphery of the connecting pipe, each of the plurality of first electric drive sources has a drive end capable of reciprocating in a straight line direction, each of the plurality of drive ends is connected with a gate plate, each of the plurality of gate plates extends into the connecting pipe, and each of the plurality of drive ends can drive the gate plate to move along the axis of the connecting pipe to approach or move away from the connecting pipe. The present application uses the electric drive mode to drive the gate plate to open or close the connecting pipe, effectively improves the response speed, reduces the overall weight, and improves the stability of the connection with the wellhead.

Description

Technical Field

[0001] This invention relates to the field of blowout preventer technology, and more particularly to an underwater blowout preventer. Background Technology

[0002] Natural gas hydrates exist in solid form within loose sedimentary layers on muddy seabeds. Currently, they can be extracted using well drilling and depressurization methods. However, due to the shallow burial depth of natural gas hydrate deposits, well depths are typically less than 500 meters, resulting in weak wellhead bearing capacity. Current subsea blowout preventers (BOPs) typically employ electro-hydraulic hybrid control systems, with their internal well-closing mechanisms driven hydraulically. This results in slow execution speeds. Because of the shallow hydrate burial depth, the free gas beneath the hydrate has very little time to enter the wellbore, making it difficult for hydraulically driven well-closing mechanisms to close in time. Furthermore, subsea BOPs with electro-hydraulic hybrid control systems weigh over 400 tons, severely impacting wellhead stability. Therefore, a faster and lighter subsea BOP is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to provide an underwater blowout preventer to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this invention is:

[0005] An underwater blowout preventer includes: a bracket connected to a connecting pipe extending in a vertical direction; a blowout preventer assembly including a first electric drive source and a gate, wherein multiple first electric drive sources are arranged along the outer periphery of the connecting pipe, each of the multiple first electric drive sources has a drive end capable of reciprocating in a linear direction, each of the multiple drive ends is connected to the gate, each of the multiple gates extends into the connecting pipe, and each of the multiple drive ends can drive the gate to move along an axis close to or away from the connecting pipe.

[0006] This technical solution has at least the following beneficial effects: In use, the bracket and connecting pipe are connected as a whole to the wellhead of the external equipment, so that the bottom end of the connecting pipe is connected to the wellhead. Multiple gates in the blowout preventer assembly are used to open or close the interior of the connecting pipe. When it is necessary to put or take out the drill string into the connecting pipe or to open the connecting pipe, multiple first electric drive sources drive the gates away from the axis of the connecting pipe, so that the multiple gates move away from each other, thereby opening the connecting pipe. When it is necessary to hold the drill string or close the connecting pipe, multiple first electric drive sources drive the gates closer to the axis of the connecting pipe, so that the multiple gates press against each other, forming a structure that seals and separates the interior of the connecting pipe, thereby closing the connecting pipe. In this way, the gates are driven by electric drive to open or close the connecting pipe, which effectively improves the execution response speed and helps to reduce the overall weight and improve the stability of the connection with the wellhead.

[0007] As a further improvement to the above technical solution, the first electric drive source includes a connecting seat, a planetary gear set, a lead screw, and two motors. The connecting seat is connected to the outside of the connecting pipe. The planetary gear set and the two motors are respectively disposed on the connecting seat. The two motors are respectively driven and connected to main gears. The two main gears mesh with the outer ring of the planetary gear set on both sides. The inner ring of the planetary gear set is driven and connected to the lead screw. The drive end is formed inside the lead screw.

[0008] As a further improvement to the above technical solution, two blowout preventers are provided along the vertical direction. In the upper blowout preventer, a plurality of gates are provided with clamps on the side of the connecting pipe axis.

[0009] As a further improvement to the above technical solution, the present invention also includes a heat dissipation assembly, which includes a cooling box and a water pressure compensation device. The water pressure compensation device is provided with a first piston, which divides the interior of the water pressure compensation device into a first cavity and a second cavity. The first cavity is provided with a connecting hole that communicates with the outside. The first electric drive source is provided with a first heat dissipation channel. The cooling box, the second cavity and the first heat dissipation channel are respectively connected to each other through pipes, so that liquid can circulate among the cooling box, the second cavity and the first heat dissipation channel.

[0010] As a further improvement to the above technical solution, a accumulator is provided in the first electric drive source at the position corresponding to the drive end, and a second piston is provided on the drive end. The second piston divides the accumulator into two third cavities along the movement direction of the drive end. The second cavity is connected to the third cavity away from the gate through a pipeline.

[0011] As a further improvement to the above technical solution, a switching valve is provided at the pipeline connection between the third cavity and the second cavity.

[0012] As a further improvement to the above technical solution, the bottom of the connecting pipe is provided with an outer sleeve, and a locking plate that can move along the outside of the connecting pipe is provided inside the outer sleeve. The locking plate protrudes downward from the connecting pipe, and multiple locking plates are provided and arranged around the connecting pipe.

[0013] As a further improvement to the above technical solution, a second electric drive source is connected to the outer side of the outer sleeve. Multiple second electric drive sources are arranged around the outer sleeve, and the movable ends of the multiple second electric drive sources extend into the outer sleeve and are respectively connected to the multiple locking plates.

[0014] As a further improvement to the above technical solution, a second heat dissipation channel is provided in the second electric drive source. The cooling box, the second cavity and the second heat dissipation channel are respectively connected to each other through pipes, so that the liquid can circulate between the cooling box, the second cavity and the second heat dissipation channel.

[0015] As a further improvement to the above technical solution, a first protrusion is provided on the inner side of the outer sleeve corresponding to the position of the connecting pipe, and a second protrusion is provided on the inner side of the outer sleeve protruding from the position of the connecting pipe. The first protrusion and the second protrusion extend around the outer sleeve respectively, and an annular groove is provided on the outer side of the connecting pipe corresponding to the position of the first protrusion. The first protrusion is engaged and connected in the annular groove.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the motor, planetary gear set, and lead screw transmission structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the heat dissipation structure connection of the present invention.

[0021] Figure 4 This is a schematic diagram of the gate structure of the upper anti-spray assembly of the present invention.

[0022] Figure 5 This is a schematic diagram of the gate structure of the lower blowout preventer assembly of the present invention.

[0023] In the attached diagram: 100-bracket, 110-connecting pipe, 210-first electric drive source, 211-motor, 212-main gear, 213-planetary gear set, 214-lead screw, 215-connecting seat, 216-third cavity, 217-second piston, 218-switch valve, 220-gate, 221-clamp, 231-outer sleeve, 232-locking plate, 233-second electric drive source, 234-first protrusion, 235-second protrusion, 310-cooling box, 320-water pressure compensation device, 321-first piston. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] Reference Figure 1An underwater blowout preventer includes a bracket 100 and a blowout preventer assembly. The bracket 100 is connected to a connecting pipe 110 extending vertically. In practical applications, the connecting pipe 110 can be a single, continuous pipe extending vertically, or it can be a multi-segmented pipe. The blowout preventer assembly includes a first electric drive source 210 and a gate 220. Multiple first electric drive sources 210 are arranged along the outer periphery of the connecting pipe 110. Each of the multiple first electric drive sources 210 has a drive end capable of reciprocating in a linear direction. Each drive end is connected to the gate 220, and each gate 220 extends into the connecting pipe 110. Each drive end can drive the gate 220 to move along an axis approaching or away from the connecting pipe 110.

[0029] As described above, during use, the bracket 100 and the connecting pipe 110 are connected to the wellhead of the external device, so that the bottom end of the connecting pipe 110 is connected to the wellhead. The multiple gates 220 in the blowout preventer assembly are used to open or close the interior of the connecting pipe 110. When it is necessary to put or take the drill string into the connecting pipe 110 or to open the connecting pipe 110, the multiple first electric drive sources 210 respectively drive the gates 220 away from the axis of the connecting pipe 110, so that the multiple gates 220 move away from each other, thereby opening the connecting pipe 110. When it is necessary to hold the drill string or close the connecting pipe 110, the multiple first electric drive sources 210 respectively drive the gates 220 closer to the axis of the connecting pipe 110, so that the multiple gates 220 press against each other, forming a structure that seals and separates the interior of the connecting pipe 110, thereby closing the connecting pipe 110. In this way, the gates 220 are driven by electric drive to open or close the connecting pipe 110, which effectively improves the execution response speed and helps to reduce the overall weight and improve the stability of the connection with the wellhead.

[0030] The first electric drive source 210 can use only one motor 211 to provide driving force, but since the gate 220 is subject to water resistance when moving underwater, in order to make the movement of the gate 220 more stable, in this embodiment, such as Figure 2As shown, the first electric drive source 210 includes a connecting seat 215, a planetary gear set 213, a lead screw 214, and two motors 211. The connecting seat 215 is connected to the outside of the connecting pipe 110. The planetary gear set 213 and the two motors 211 are respectively disposed on the connecting seat 215. The two motors 211 are respectively driven by main gears 212. The two main gears 212 mesh with the outer ring of the planetary gear set 213. The inner ring of the planetary gear set 213 is driven by the lead screw 214. In practical applications, the planetary gear set 213 includes an outer ring and an inner ring. The planetary gears, with the inner ring being the sun gear, have teeth on both the inner and outer sides of the outer ring. The outer ring is coaxially positioned outside the inner ring. Multiple planetary gears are positioned between the outer and inner rings and mesh with them. The lead screw 214 has a drive end formed within it. The lead screw 214 has a nut pair and a screw pair, which are threadedly connected to each other. The nut pair is connected to the inner ring, and the inner ring drives the nut pair to rotate synchronously. The screw pair is slidably positioned outside the connecting pipe 110. With the rotation of the nut pair, the screw pair acts as the drive end, driving the gate 220 to move along the axis that is close to or away from the connecting pipe 110.

[0031] In this embodiment, two motors 211 drive the main gear 212 to rotate, which in turn drives the outer ring of the planetary gear set 213 to rotate. The power of the outer ring can be transmitted to the inner ring through multiple planetary gears, thereby driving the inner ring to rotate. The inner ring then outputs power to the lead screw 214. The screw pair in the lead screw 214 serves as the driving end and is connected to the gate 220, providing the gate 220 with the power for reciprocating movement. This increases the torque that drives the gate 220 and improves the stability of the gate 220's movement, making it particularly suitable for underwater operations.

[0032] In practical applications, a first electric drive source 210 and a gate 220 connected to it constitute a movable unit. Two, three, or four movable units can be provided in the blowout preventer assembly. For example, when there are two movable units, two first electric drive sources 210 are evenly arranged around the connecting pipe 110. At this time, the driving ends of the two first electric drive sources 210 are respectively connected to the gate 220. The two first electric drive sources 210 drive the two gates 220 to move closer to each other and press against each other to close the connecting pipe 110, or the two first electric drive sources 210 drive the two gates 220 to move away from each other to open the connecting pipe 110.

[0033] Depending on the usage, multiple anti-spray components can be provided. In this embodiment, for example... Figure 4 and Figure 5As shown, there are two blowout preventers arranged in the vertical direction. In the upper blowout preventer, when there are two gates 220, the two gates 220 are respectively provided with clamps 221 on the side of the connecting pipe 110 near the axis. When a tool needs to be fed into the wellhead, the gates 220 in both the upper and lower blowout preventer (BOP) assemblies are in the open state. When it is necessary to clamp the tool, the upper BOP assembly clamps the external tool. Specifically, the two gates 220 approach each other and press against the outside of the tool, using the clamp 221 to avoid the tool, thereby clamping the tool. When the two gates move away from each other, the clamping of the tool can be released. When it is necessary to completely seal the connecting pipe 110, in the lower BOP assembly, the two gates 220 approach each other to seal the connecting pipe 110. In this BOP assembly, the two gates 220 can form a continuous sealing structure by pressing against each other, thereby sealing the inside of the connecting pipe 110. When it is not necessary to prevent the wellhead from expelling air, the two gates 220 are in a state of moving away from each other to open the connecting pipe 110.

[0034] To better control the temperature of the first electric drive source 210, the present invention also includes a heat dissipation component, such as... Figure 3 As shown in the figure, the arrows indicate the direction of coolant flow. The heat dissipation assembly includes a cooling box 310 and a water pressure compensation device 320. A first piston 321 is installed inside the water pressure compensation device 320, dividing the interior of the device into a first cavity and a second cavity. The first cavity has a connecting hole to the outside, allowing external water to enter and compensate for the pressure difference. In practical applications, a spring is installed inside the first cavity, with its upper and lower ends abutting against the first piston 310. The bottom side of 21 and the bottom side of the first cavity are held in place by a spring, especially when the water pressure compensation device 320 is not submerged. The first electric drive source 210 is provided with a first heat dissipation channel. The cooling box 310, the second cavity and the first heat dissipation channel are respectively connected to each other through pipes, so that the liquid can circulate between the cooling box 310, the second cavity and the first heat dissipation channel. Naturally, at least one delivery pump is provided to promote the circulation of liquid between the cooling box 310, the second cavity and the first heat dissipation channel.

[0035] When the first electric drive source 210 is working, it generates heat. The coolant in the cooling box 310 enters the second cavity and then flows from the second cavity into the first heat dissipation channel. As the coolant flows in the first heat dissipation channel, it can carry away the heat generated by the first electric drive source 210 and then return to the cooling box 310. The cooling box 310 is located underwater and can exchange heat with seawater to re-cool the coolant. During this process, seawater can enter the first cavity through the connecting hole and change the internal pressure of the first cavity and the second cavity through the first piston 321, thereby compensating for the pressure of the water depth and improving the overall working stability.

[0036] The first heat dissipation channel provided in the first electric drive source 210 is mainly designed to form a channel for coolant flow within the first electric drive source 210. When the first electric drive source 210 includes two motors 211, a planetary gear set 213, and a lead screw 214, a channel for coolant flow can be provided inside or outside the housing of the two motors 211 to form the first heat dissipation channel. In this case, the coolant is mainly used to cool the two motors 211. In addition, a channel for coolant flow can also be provided inside or outside the housing of the planetary gear set 213. In this case, the coolant can cool the two motors 211 and the lead screw 214 simultaneously.

[0037] To further reduce the load required by the motor 211 when the drive gate 220 closes the connecting pipe 110, in this embodiment, a pressure storage chamber is provided in the first electric drive source 210 at the position corresponding to the drive end, and a second piston 217 is provided on the drive end. The second piston 217 divides the pressure storage chamber into two third cavities 216 along the movement direction of the drive end. The second cavity is connected to the third cavity 216 away from the gate 220 through a pipeline. When the first electric drive source 210 needs to drive the gate 220 to move along the axis close to the connecting pipe 110, the drive end of the first electric drive source 210 provides power to the second piston 217. In addition, coolant is supplied from the second cavity of the water pressure compensation device 320 to a third cavity 216 in the accumulator chamber away from the gate 220. Under the action of seawater pressure, the coolant can be quickly supplied to the third cavity 216 and provide driving force to the drive end by acting on the second piston 217, thereby reducing the driving force required by the first electric drive source 210 itself to the drive end. When the gate 220 needs to move along the axis away from the connecting pipe 110, the second piston 217 pushes the coolant back into the second cavity through the pipeline, or the third cavity 216 away from the gate 220 is connected to the cooling tank through the pipeline. At this time, the second piston 217 pushes the coolant back into the cooling tank through the pipeline.

[0038] Since a drive end is formed inside the lead screw 214, a pressure accumulator is set inside the first electric drive source 210 at the position corresponding to the drive end, that is, inside the housing where the lead screw 214 is located. At this time, a second piston 217 is set on the screw axis of the lead screw 214, and the second piston 217 divides the inside of the housing into two third cavities 216.

[0039] In the above embodiment, after the gate 220 is moved to its position, if it is necessary to maintain the position of the gate 220, the motor 211 needs to maintain the anti-reverse torque for a long time. In order to better lock the position of the gate 220, in this embodiment, a switching valve 218 is provided at the pipeline connection between the third cavity 216 and the second cavity. When the gate 220 is moving, the switching valve 218 is in the open state, and the coolant in the third cavity 216 can freely enter and exit the third cavity 216. When the gate 220 is moved to its position and needs to be locked, the switching valve 218 is closed. At this time, the coolant filled in the third cavity 216 maintains the driving force provided to the third piston, thereby better maintaining the position of the drive end, that is, the screw pair. This can further reduce the workload of the motor 211, extend the service life of the motor 211, and better lock the position of the gate 220, improving the overall operational safety.

[0040] To improve the convenience and stability of connecting the connecting pipe 110 to the external wellhead, in this embodiment, an outer sleeve 231 is provided at the bottom of the connecting pipe 110. Inside the outer sleeve 231, a locking plate 232 is provided, which can move towards or away from the outside of the connecting pipe 110. Multiple locking plates 232 protrude downwards from the connecting pipe 110 and are arranged around the connecting pipe 110. When connecting to the wellhead, the locking plates 232 are in a position away from the connecting pipe 110. The bottom end of the connecting pipe 110 is placed against the top end of the wellhead, and then the locking plates 232 are brought close to and pressed against the outside of the connecting pipe 110. At this time, the portion of the locking plates 232 protruding downwards from the connecting pipe 110 also abuts against the outside of the wellhead. In this way, multiple locking plates 232 simultaneously abut against the connecting pipe 110 and the wellhead from different positions and hold them tightly in place, achieving rapid docking and positioning of the two.

[0041] Naturally, the outer sleeve 231 is equipped with a drive source, such as a cylinder or hydraulic cylinder, capable of moving the locking plate 232 back and forth. Similarly, to improve response speed and better control weight, in this embodiment, a second electric drive source 233 is connected to the outside of the outer sleeve 231. For example, the second electric drive source 233 can be an electric lead screw 214. Multiple second electric drive sources 233 are arranged around the outer sleeve 231, and the movable ends of the multiple second electric drive sources 233 extend into the outer sleeve 231 and are respectively connected to the multiple locking plates 232. The multiple second electric drive sources 233 on the outside of the outer sleeve 231 provide driving force to the multiple locking plates 232, which effectively improves the execution response speed and helps reduce the overall weight, achieving a stable connection with the wellhead.

[0042] In the above embodiment, when the locking plate 232 abuts against the connecting pipe 110 and the wellhead, mutual locking is mainly achieved by the friction between the inner side of the locking plate 232 and the connecting pipe 110 and the wellhead. To further improve the effect of the locking plate 232 in pressing and positioning the connecting pipe 110 and the wellhead, in this embodiment, a first protrusion 234 is provided on the inner side of the outer sleeve 231 corresponding to the position of the connecting pipe 110, and a second protrusion 235 is provided on the inner side of the outer sleeve 231 protruding from the position of the connecting pipe 110. The first protrusion 234 and... The second protrusion 235 extends around the outer sleeve 231. An annular groove is provided on the outer side of the connecting tube 110 corresponding to the position of the first protrusion 234. The first protrusion 234 is engaged and connected in the annular groove. In practical applications, multiple first protrusions 234 can be provided on the inner side of the outer sleeve in the vertical direction. Correspondingly, multiple annular grooves can also be provided in the vertical direction. At this time, multiple first protrusions 234 are engaged and connected in multiple annular grooves. Similarly, multiple first protrusions 234 can also be provided on the inner side of the outer sleeve in the vertical direction.

[0043] When the locking plate 232 is not pressing against and locking the connecting pipe 110 and the wellhead, the locking plate 232 is in a state away from the connecting pipe 110 and the wellhead. At this time, the first protrusion 234 disengages from the annular groove, and the second protrusion 235 also disengages from the slot opened on the outside of the wellhead. When it is necessary to further position the connected connecting pipe 110 and the wellhead, the locking plate 232 moves closer to the connecting pipe 110 and the wellhead. At this time, the first protrusion 234 is engaged with the annular groove, and the second protrusion 235 is engaged with the slot opened on the outside of the wellhead. In this way, through the concave and convex engagement of the locking plate 232 with the connecting pipe 110 and the wellhead, the phenomenon of mutual displacement and separation of the connecting pipe 110 and the wellhead can be effectively prevented, further improving the docking and locking effect of the connecting pipe 110 and the wellhead.

[0044] Similarly, in order to better control the temperature of the second electric drive source 233, a second heat dissipation channel is provided inside the second electric drive source 233. The cooling box 310, the second cavity and the second heat dissipation channel are respectively connected to each other through pipes, so that the liquid can circulate between the cooling box 310, the second cavity and the second heat dissipation channel. Naturally, at least one delivery pump is provided to promote the circulation of liquid between the cooling box 310, the second cavity and the second heat dissipation channel.

[0045] During operation, the coolant in the cooling box 310 is delivered to the second cavity and then to the second heat dissipation channel. As the coolant flows through the second heat dissipation channel, it carries away the heat generated by the second electric drive source 233. The coolant then returns to the cooling box 310, which is located underwater and can exchange heat with seawater, thus recooling the coolant. The second heat dissipation channel within the second electric drive source 233 primarily aims to create a channel for coolant flow. When the second electric drive source 233 includes a motor 211 and a lead screw 214, a channel for coolant flow can be provided inside or outside the motor 211 housing to form the second heat dissipation channel.

[0046] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An underwater blowout preventer, characterized in that: include: The bracket (100) is connected to a connecting tube (110) extending in the vertical direction. The blowout preventer assembly includes a first electric drive source (210) and a gate (220). The first electric drive source (210) is provided in multiple ways and the multiple first electric drive sources (210) are arranged along the outer periphery of the connecting pipe (110). The multiple first electric drive sources (210) each have a drive end that can reciprocate in a straight line direction. The multiple drive ends are respectively connected to the gate (220). The multiple gates (220) extend into the connecting pipe (110). The multiple drive ends can respectively drive the gates (220) to move along an axis close to or away from the connecting pipe (110). The heat dissipation assembly includes a cooling box (310) and a water pressure compensation device (320). The water pressure compensation device (320) is provided with a first piston (321). The first piston (321) divides the interior of the water pressure compensation device (320) into a first cavity and a second cavity. The first cavity is provided with a connecting hole that connects to the outside. The first electric drive source (210) is provided with a first heat dissipation channel. The cooling box (310), the second cavity and the first heat dissipation channel are respectively connected to each other through pipes, so that liquid can circulate between the cooling box (310), the second cavity and the first heat dissipation channel. The first electric drive source (210) is provided with a pressure storage chamber at the position corresponding to the drive end. The drive end is provided with a second piston (217). The second piston (217) divides the pressure storage chamber along the direction of movement of the drive end to form two third cavities (216). The second cavity is connected to the third cavity (216) away from the gate (220) through a pipe.

2. The underwater blowout preventer according to claim 1, characterized in that: The first electric drive source (210) includes a connecting seat (215), a planetary gear set (213), a lead screw (214), and two motors (211). The connecting seat (215) is connected to the outside of the connecting pipe (110). The planetary gear set (213) and the two motors (211) are respectively disposed on the connecting seat (215). The two motors (211) are respectively driven by main gears (212). The two main gears (212) mesh with the outer ring of the planetary gear set (213). The inner ring of the planetary gear set (213) is driven by the lead screw (214). The drive end is formed inside the lead screw (214).

3. The underwater blowout preventer according to claim 1, characterized in that: Two blowout preventers are provided along the vertical direction. In the upper blowout preventer, a plurality of gates (220) are provided with clamps (221) on the side near the axis of the connecting pipe (110).

4. The underwater blowout preventer according to claim 1, characterized in that: A switch valve (218) is provided at the pipeline connection between the third cavity (216) and the second cavity.

5. An underwater blowout preventer according to claim 1, characterized in that: The bottom of the connecting pipe (110) is provided with an outer sleeve (231), and a locking plate (232) that can move along the outside of the connecting pipe (110) is provided inside the outer sleeve (231). The locking plate (232) protrudes downward from the connecting pipe (110), and multiple locking plates (232) are provided and arranged around the connecting pipe (110).

6. An underwater blowout preventer according to claim 5, characterized in that: The outer sleeve (231) is connected to a second electric drive source (233). Multiple second electric drive sources (233) are arranged around the outer sleeve (231). The movable ends of the multiple second electric drive sources (233) extend into the outer sleeve (231) and are respectively connected to multiple locking plates (232).

7. An underwater blowout preventer according to claim 6, characterized in that: The second electric drive source (233) is provided with a second heat dissipation channel. The cooling box (310), the second cavity and the second heat dissipation channel are respectively connected to each other through pipes, so that the liquid can circulate between the cooling box (310), the second cavity and the second heat dissipation channel.

8. An underwater blowout preventer according to claim 5, characterized in that: The inner side of the outer sleeve (231) is provided with a first protrusion (234) corresponding to the position of the connecting pipe (110), and the inner side of the outer sleeve (231) is provided with a second protrusion (235) protruding from the position of the connecting pipe (110). The first protrusion (234) and the second protrusion (235) extend around the outer sleeve (231) respectively. The outer side of the connecting pipe (110) is provided with an annular groove corresponding to the position of the first protrusion (234), and the first protrusion (234) is engaged and connected in the annular groove.

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