Pressure balancing device and deep-sea prospecting mining gathering and transporting pump set

Abstract

The invention relates to the technical field of deep-sea prospecting and mining, in particular to a pressure balancing device and a deep-sea prospecting and mining gathering and transporting pump set. The pressure balancing device comprises a shell, an external pressure connector is formed in the top of the shell, and an internal pressure connector is formed in the bottom of the shell; the adjusting bag is arranged in the shell, and the internal pressure connector is communicated with the adjusting bag; the inner pressure regulating medium is arranged in the regulating bag; and the outer pressure regulating medium is arranged in the shell and is positioned outside the regulating bag. The motor has the effect of pressure difference inside and outside the motor.

Description

Technical Field

[0001] The present application relates to the technical field of deep-sea prospecting and mining, and in particular to a pressure balancing device and a gathering and transportation pump group for deep-sea prospecting and mining. Background Art

[0002] It is very difficult to transport deep-sea minerals to the surface, especially transporting deep-sea minerals below 6,000 meters to surface ships, which is a key link that plagues the development of the industry. In the prior art, a multi-stage pump group with two or three stages hoisted in the water is used at different depths, and a relay method of step-by-step pressurization is used to achieve deep-sea mineral transportation, and mineral transportation is achieved through connecting pipelines. This multi-stage transportation solution has a long equipment installation cycle and high engineering cost. Therefore, the industry is looking for a high-lift pump group that can complete the transportation through a single-stage transportation. However, due to the high underwater pressure in deep sea water, reliable sealing of the motor is a big problem. If a conventional pressure balancing device is used to achieve the balance of internal and external pressure of the motor, and at the same time a pump group method of single-stage transportation is used, then by the last lifting pump, the mechanical seal pressure of its motor will reach about 10MPa, which will be difficult to achieve for the mechanical seal of the motor and its reliability will be very low. Summary of the invention

[0003] In order to balance the pressure difference between the inside and outside of a motor, the present application provides a pressure balancing device and a deep-sea prospecting and mining gathering and transportation pump group.

[0004] In a first aspect, the present application provides a pressure balancing device, which adopts the following technical solution: A pressure balancing device comprises an outer shell, wherein the top of the outer shell is provided with an external pressure interface, and the bottom is provided with an internal pressure interface; a regulating capsule, wherein the regulating capsule is arranged in the outer shell, and the internal pressure interface is connected to the regulating capsule; an internal pressure regulating medium, wherein the internal pressure regulating medium is arranged in the regulating capsule; and an external pressure regulating medium, wherein the external pressure regulating medium is arranged in the outer shell and is located outside the regulating capsule.

[0005] By adopting the above technical solution, when there is a pressure difference between the internal pressure interface and the external pressure interface, the side with higher pressure can compress the other pressure regulating medium through its corresponding pressure regulating medium through the regulating bag, so that the pressures of the pressure regulating media on both sides tend to be balanced, thereby realizing pressure regulation of the position connected to the external pressure interface and the position connected to the internal pressure interface.

[0006] Optionally, the pressure balancing device further comprises a pressure regulating assembly, wherein the pressure regulating assembly is disposed in the outer shell and connected to the regulating capsule, and is used for compressing or stretching the regulating capsule so as to generate a pressure difference between the external pressure interface and the internal pressure interface.

[0007] By adopting the above technical solution, the setting of the pressure regulating component can flexibly adjust the shape of the regulating bag, thereby changing the pressure difference between the internal pressure interface and the external pressure interface, and effectively responding to the ever-changing pressure conditions in the deep sea environment.

[0008] Optionally, the voltage regulating assembly includes a spring, one end of the spring is connected to the top of the regulating capsule, and the other end of the spring is connected to the top wall of the shell.

[0009] By adopting the above technical solution, the elasticity of the spring is utilized to change the original length of the spring, so that the shape of the regulating bag can be adjusted. When the original length of the spring is greater than the internal and external pressure balance point, the spring can compress the regulating bag. When the original length of the spring is less than the internal and external pressure balance point, the spring can stretch the regulating bag to generate a pressure difference, thereby improving the adaptability of the device.

[0010] Optionally, the pressure regulating assembly further comprises a gravity block, wherein the gravity block is arranged at the top of the regulating capsule, and one end of the spring away from the top wall of the shell is connected to the top of the regulating capsule through the gravity block.

[0011] By adopting the above technical solution, when the original length of the spring is greater than the internal and external pressure balance point, the addition of the gravity block can increase the stability of the pressure regulating assembly, while using gravity to help the spring better adjust the shape of the regulating bag.

[0012] In the second aspect, the present application provides a deep-sea prospecting and mining gathering and transportation pump group, which adopts the following technical solution: A deep-sea prospecting and mining gathering and transportation pump set, comprising a fixed component; Multiple lifting pumps, all of which are connected to the fixed component, and the water inlets and outlets of the multiple lifting pumps are connected in sequence. The lifting pump includes a pump body, a submersible motor driven by the pump body, and the above-mentioned pressure balancing device.

[0013] By adopting the above technical solution, the water inlet and outlet of the lifting pump are connected in sequence, realizing continuous and uninterrupted lifting of the fluid. This series connection ensures that the gathering and transportation pump group can maintain stable operation even under high pressure or high flow demand. At the same time, the built-in pressure balance device of the lifting pump can automatically adjust the pressure in the motor to prevent the sealing performance from deteriorating due to pressure fluctuations, thereby effectively extending the service life of the lifting pump and improving the overall reliability of the system.

[0014] Optionally, the external pressure interface is connected to the liquid inlet end of the pump body, and the internal pressure interface is connected to the inside of the submersible motor.

[0015] By adopting the above technical solution, the pressure inside the submersible motor and the external environment is effectively balanced, the impact of excessive internal and external pressure difference on the motor sealing performance is reduced, and the stability and reliability of deep-sea exploration and mining gathering and transportation pump groups in deep-sea operations are improved.

[0016] Optionally, the submersible motor is filled with lubricating oil, the internal pressure regulating medium is a lubricating oil of the same type as the lubricating oil filled in the submersible motor, and the external pressure regulating medium is seawater.

[0017] By adopting the above technical solution and using the same lubricating oil as that inside the submersible motor as the internal pressure regulating medium, it is possible to better connect with the pressure environment inside the submersible motor through the regulating capsule, thereby improving the ability of the submersible motor to withstand deep-sea water pressure and maintain sealing performance.

[0018] Optionally, the pressure regulating assembly is used to compress the regulating bag so that the pressure at the internal pressure interface is greater than that at the external pressure interface.

[0019] By adopting the above technical solution, the internal pressure of the submersible motor is ensured to be slightly higher than the external environment, which effectively prevents external moisture from penetrating into the motor and protects the safe operation of the motor.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application uses a pressure balancing device to achieve pressure balance inside and outside the submersible motor, effectively avoiding the problem of motor seal failure caused by the high underwater pressure of deep sea water, and significantly improving the working reliability and service life of the deep-sea prospecting and mining gathering and transportation pump group. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the internal structure of the pressure balancing device provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the structure of a deep-sea prospecting and mining gathering and transportation pump group provided in an embodiment of the present application; Figure 3 It is a schematic diagram of the structure of the lift pump provided in an embodiment of the present application.

[0022] Explanation of the reference numerals: 1-pump body; 101-liquid inlet end; 102-liquid outlet end; 2-submersible motor; 3-pressure balancing device; 301-housing; 302-external pressure interface; 303-internal pressure interface; 304-adjusting capsule; 305-spring; 306-gravity block. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-3 This application is described in further detail.

[0024] The embodiment of the present application discloses a pressure balancing device.

[0025] like Figure 1 As shown, the pressure balancing device includes a shell 301 and a regulating capsule 304. The top of the shell 301 is provided with an external pressure interface 302, and the bottom is provided with an internal pressure interface 303. The regulating capsule 304 is arranged inside the shell 301, and the internal pressure interface 303 is connected with the regulating capsule 304. The regulating capsule 304 is filled with an internal pressure regulating medium, and the shell 301 is filled with an external pressure regulating medium, and the external pressure regulating medium surrounds the outside of the regulating capsule 304. When there is a pressure difference between the internal pressure interface 303 and the external pressure interface 302, the side with higher pressure can act on the regulating capsule 304 through its corresponding pressure regulating medium, and then exert pressure on the pressure regulating medium on the other side, so that the pressure of the pressure regulating media on both sides reaches a balanced state, thereby realizing the pressure regulating function of the positions connected to the external pressure interface 302 and the internal pressure interface 303.

[0026] like Figure 1 As shown, in order to adjust the pressure at the external pressure interface 302 and the internal pressure interface 303 so as to generate a pressure difference between the two, the pressure balancing device may further include a pressure regulating component, which is arranged in the housing 301 and is connected to the regulating capsule 304, and the pressure regulating component is used to compress or stretch the regulating capsule 304. When the pressure of the external pressure interface 302 and the internal pressure interface 303 reaches a balanced state, if the regulating capsule 304 is stretched, the pressure at the internal pressure interface 303 is relatively reduced, while the pressure at the external pressure interface 302 is relatively increased, resulting in the pressure at the external pressure interface 302 exceeding the pressure at the internal pressure interface 303. On the contrary, if the regulating capsule 304 is compressed, the pressure at the internal pressure interface 303 is relatively increased, and the pressure at the external pressure interface 302 is relatively decreased, so that the pressure at the external pressure interface 302 is lower than the pressure at the internal pressure interface 303.

[0027] like Figure 1 As shown, specifically, the pressure regulating assembly includes a spring 305, one end of the spring 305 is connected to the upper part of the regulating capsule 304, and the other end is connected to the top wall of the housing 301. Through the elastic characteristics of the spring 305, the original length of the spring 305 is adjusted to adjust the shape of the regulating capsule 304. When the original length of the spring 305 exceeds the internal and external pressure balance point (the internal and external pressure balance point here refers to the distance between the upper part of the regulating capsule 304 and the top wall of the outer shell 301 when the internal and external pressures are balanced under the premise that the pressure balancing device does not have a pressure regulating component), the distance between the upper part of the regulating capsule 304 and the top wall of the outer shell 301 will be compressed by the spring 305; conversely, if the original length of the spring 305 is less than the internal and external pressure balance point (the internal and external pressure balance point here refers to the distance between the upper part of the regulating capsule 304 and the top wall of the outer shell 301 when the internal and external pressures are balanced under the premise that the pressure balancing device does not have a pressure regulating component), the distance between the upper part of the regulating capsule 304 and the top wall of the outer shell 301 will be stretched by the spring 305, thereby generating a pressure difference.

[0028] In addition, the pressure regulating assembly further includes a weight block 306, which is disposed at the top of the regulating capsule 304, and one end of the spring 305 away from the top wall of the housing 301 is connected to the top of the regulating capsule 304 through the weight block 306. When the original length of the spring 305 is greater than the internal and external pressure balance point (the internal and external pressure balance point here refers to the distance between the upper part of the regulating capsule 304 and the top wall of the housing 301 when the internal and external pressures are balanced under the premise that the pressure balancing device does not have a pressure regulating assembly), the addition of the weight block 306 can increase the stability of the pressure regulating assembly, and at the same time, use the gravity to help the spring 305 better adjust the shape of the regulating capsule 304.

[0029] The implementation principle of a pressure balancing device in an embodiment of the present application is: when the pressure regulating component is not required for pressure regulation and only pressure balancing is required, the dynamic balance of internal and external pressures can be achieved through the regulating capsule 304. Specifically, when there is a pressure difference between the external pressure interface 302 and the internal pressure interface 303, this pressure difference will directly affect the pressure distribution inside the regulating capsule 304. Since the regulating capsule 304 is filled with an internal pressure regulating medium, and the shell 301 is filled with an external pressure regulating medium surrounding the outside of the regulating capsule 304, the interaction between the two can lay the foundation for regulating pressure.

[0030] When the pressure regulating assembly is needed for pressure regulation, before actual use, the pressure balancing device without the pressure regulating assembly is installed at the use position. When the pressure changes of the interfaces on both sides tend to be balanced, the pressure regulating medium on both sides will act on the regulating capsule 304, pushing the upper part of the regulating capsule 304 to a specific position, which is the actual pressure balance position. At this time, the pressure balancing device with the pressure regulating assembly is installed at the use position. If the spring 305 in the pressure regulating assembly is in a proper position, that is, its original length and the distance between the actual pressure balance position and the top wall of the housing 301 match, the movement of the regulating capsule 304 will not be resisted by the spring 305, and gradually reach the internal and external pressure balance point. If the original length of the spring 305 is greater than the distance between the actual pressure balance position and the top wall of the housing 301, the spring 305 will compress the regulating capsule 304, increasing the distance between its upper part and the top wall of the housing 301, further increasing the pressure at the internal pressure interface 303; conversely, if the original length of the spring 305 is less than the distance between the actual pressure balance position and the top wall of the housing 301, the spring 305 will stretch the regulating capsule 304, reducing the pressure at the internal pressure interface 303. The gravity block 306 can assist the spring 305 in adjusting the pressure at the internal pressure interface 303 through its gravity when the pressure at the internal pressure interface 303 needs to be increased.

[0031] The embodiment of the present application also discloses a deep-sea prospecting and mining gathering and transportation pump group.

[0032] like Figure 2and Figure 3 As shown, the deep-sea prospecting and mining gathering and transportation pump group includes a fixed component, which can be a platform or a skid; multiple lifting pumps, each of which is connected to the fixed component, and the water inlets and outlets of the multiple lifting pumps are connected in sequence. Among them, the lifting pump includes a pump body 1, a submersible motor 2 driven and connected to the pump body 1, and the above-mentioned pressure balancing device 3. The submersible motor 2 is filled with lubricating oil to lubricate the internal structure of the submersible motor 2. The water inlet and outlet of the lifting pump are connected in sequence to achieve continuous and uninterrupted lifting of the fluid. This series connection ensures that the gathering and transportation pump group can maintain stable operation even under high pressure or high flow requirements. At the same time, the built-in pressure balancing device 3 of the lifting pump can automatically adjust the pressure in the motor to prevent the sealing performance from decreasing due to pressure fluctuations, thereby effectively extending the service life of the lifting pump and improving the overall reliability of the system.

[0033] like Figure 2 and Figure 3 As shown, specifically, the external pressure interface 302 is connected to the liquid inlet end 101 of the pump body 1, and the internal pressure interface 303 is connected to the inside of the submersible motor 2. The internal pressure regulating medium is the same type of lubricating oil as the lubricating oil filled in the submersible motor 2, and the external pressure regulating medium is seawater. Using the same lubricating oil as the inside of the submersible motor 2 as the internal pressure regulating medium can better connect with the pressure environment inside the submersible motor 2 through the regulating capsule 304, thereby improving the ability of the submersible motor 2 to withstand the water pressure of the deep sea and maintain the sealing performance.

[0034] The pressure regulating assembly of the pressure balancing device 3 is used to compress the regulating capsule 304 so that the pressure at the internal pressure interface 303 is greater than that at the external pressure interface 302. This ensures that the internal pressure of the submersible motor 2 is slightly higher than the external environment, effectively preventing external moisture from penetrating into the motor and protecting the safe operation of the motor.

[0035] The implementation principle of a deep-sea prospecting and mining collection and transportation pump group in the embodiment of the present application is: through the series connection of multiple lifting pumps, the continuous and uninterrupted lifting of the fluid is realized, and at the same time, the pressure balance device 3 is used to automatically adjust the pressure inside the submersible motor 2 to ensure that the internal pressure of the motor is slightly higher than the external environment, thereby effectively preventing external moisture from penetrating into the motor and protecting the safe operation of the motor. In addition, by using the same lubricating oil as the internal pressure regulating medium of the submersible motor 2, the ability of the submersible motor 2 to withstand the water pressure of the deep sea and maintain the sealing performance is further improved, ensuring the stable operation and extended service life of the entire collection and transportation pump group in the deep sea environment.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure balancing device, characterized in that: include: A housing (301), wherein the top of the housing (301) is provided with an external pressure interface (302), and the bottom of the housing (301) is provided with an internal pressure interface (303); A regulating capsule (304), wherein the regulating capsule (304) is disposed in the housing (301), and the internal pressure interface (303) is in communication with the regulating capsule (304); An internal pressure regulating medium, the internal pressure regulating medium being arranged in the regulating capsule (304); An external pressure regulating medium is disposed in the outer shell (301) and outside the regulating capsule (304).

2. The pressure balancing device according to claim 1, characterized in that: The pressure balancing device (3) further comprises a pressure regulating component, which is arranged in the housing (301) and connected to the regulating capsule (304), and is used to compress or stretch the regulating capsule (304) so ​​as to generate a pressure difference between the external pressure interface (302) and the internal pressure interface (303).

3. The pressure balancing device according to claim 2, characterized in that: The voltage regulating assembly comprises a spring (305), one end of the spring (305) is connected to the top of the regulating capsule (304), and the other end of the spring (305) is connected to the top wall of the housing (301).

4. The pressure balancing device according to claim 3, characterized in that: The pressure regulating assembly further comprises a gravity block (306), wherein the gravity block (306) is arranged at the top of the regulating capsule (304), and one end of the spring (305) away from the top wall of the housing (301) is connected to the top of the regulating capsule (304) through the gravity block (306).

5. A deep-sea prospecting and mining gathering and transportation pump set, characterized in that: include: Fixing components; A plurality of lifting pumps, each of which is connected to the fixed component, and the water inlets and outlets of the plurality of lifting pumps are connected in sequence. The lifting pump comprises a pump body (1), a submersible motor (2) drivingly connected to the pump body (1), and a pressure balancing device (3) as described in any one of claims 2 to 4.

6. The deep-sea prospecting and mining gathering and transportation pump set according to claim 5 is characterized in that: The external pressure interface (302) is connected to the liquid inlet end (101) of the pump body (1), and the internal pressure interface (303) is connected to the inside of the submersible motor (2).

7. The deep-sea prospecting and mining gathering and transportation pump set according to claim 6 is characterized in that: The submersible motor (2) is filled with lubricating oil, the internal pressure regulating medium is lubricating oil of the same type as the lubricating oil filled in the submersible motor (2), and the external pressure regulating medium is seawater.

8. The deep-sea prospecting and mining gathering and transportation pump set according to claim 6 is characterized in that: The pressure regulating assembly is used to compress the regulating bag (304) so ​​that the pressure at the internal pressure interface (303) is greater than that at the external pressure interface (302).

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