All-water-lubricated deep-sea superhigh-pressure water pump

Abstract

The application discloses a full-water-lubricated deep-sea superhigh-pressure water pump and belongs to the technical field of volume pumps. The full-water-lubricated deep-sea superhigh-pressure water pump comprises a driving mechanism, a plunger flow distribution mechanism and a cooling mechanism. The cooling mechanism comprises a front end cover, a rear end cover, centrifugal pump turbine blades, a medium flow channel and a sliding bearing assembly. The sliding bearing assembly is provided with a gap for the flow of lubricating medium. The centrifugal pump turbine blades are arranged in the chamber of the rear end cover. The main shaft drives the rotation of the centrifugal pump turbine blades to drive the lubricating medium in the driving shell cavity to enter the rear end cover through the sliding bearing assembly, to be discharged from the rear end cover under the action of the centrifugal pump turbine blades, to flow into the front end cover through the medium flow channel, and to return to the driving shell after flowing through the sliding bearing assembly in the front end cover. The full-water-lubricated deep-sea superhigh-pressure water pump can guarantee the stable work of the seawater pump in the full-sea-depth range, solve the problems of the heat seizure of the main shaft caused by the high temperature of the main shaft bearing due to high load of the full-water-lubricated seawater pump in the deep-sea superhigh-pressure environment and the like, and improve the operation life of the superhigh-pressure seawater pump.

Description

Technical Field

[0001] This invention belongs to the field of positive displacement pump technology, and more specifically, relates to a fully water-lubricated deep-sea ultra-high pressure water pump. Background Technology

[0002] The deep sea holds various strategic resources essential for the future development of human society. However, the exploitation of these resources has also caused irreversible pollution to the marine environment. Metal bearings are key components in the propulsion systems of underwater vehicles and weapons, and most use mineral oil as a lubricant. Therefore, unavoidable oil leaks occur during the operation of underwater equipment, causing serious environmental pollution and hindering subsequent maintenance. Thus, water-lubricated bearings, using seawater as a lubricant, have emerged and are now widely used in water turbines, ship stern shafts, and floating work platforms. However, due to the low viscosity of water, under special operating conditions such as low speed and heavy load, it is difficult for a complete liquid film to form between the bearing and the main shaft, resulting in mixed lubrication or even dry friction. This leads to accelerated wear on the bearing contact surfaces, causing problems such as thermal seizure, which prevents water-lubricated bearings from being used in deep-sea operations.

[0003] For pressures between 10 and 20 MPa, most water-lubricated seawater pumps on the market can meet the needs of most applications, but they cannot meet the requirements of some special working conditions such as high speed and heavy load. Most existing water-lubricated seawater pumps adopt an open structure, with a filter installed at the end cover to connect seawater to the working medium inside the chamber, thereby improving the heat dissipation performance of the bearing structure. However, due to the complex seawater environment and the large number of suspended particles, the filter has a very short lifespan, making it impossible for seawater pumps to operate for extended periods in the ultra-high pressure environment of the deep sea. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a fully water-lubricated deep-sea ultra-high pressure water pump, which solves the technical problem that when the fully water-lubricated seawater pump is working under high-speed and heavy-load conditions, the main shaft bearing temperature rises too much, resulting in excessive bearing deformation and thus thermal seizure.

[0005] To achieve the above objectives, according to one aspect of the present invention, a fully water-lubricated deep-sea ultra-high pressure water pump is provided, comprising a drive mechanism, a plunger distribution mechanism, and a cooling mechanism;

[0006] The plunger distribution mechanism is connected to the drive mechanism, and the drive mechanism includes a drive housing and a main shaft disposed within the drive housing;

[0007] The cooling mechanism includes a front cover, a rear cover, centrifugal pump turbine blades, a medium flow channel, and a sliding bearing assembly;

[0008] The front end cover and the rear end cover are respectively disposed at both ends of the drive housing; the sliding bearing assembly is disposed at both ends of the main shaft and is provided with a gap for the flow of lubricating medium;

[0009] The centrifugal pump turbine blades are disposed in the cavity of the rear end cover and are fixedly installed at the end of the main shaft and rotate synchronously with the main shaft.

[0010] The two ends of the medium flow channel are respectively connected to the openings of the front end cover and the rear end cover;

[0011] During operation, the main shaft drives the centrifugal pump turbine blades to rotate, thereby driving the lubricating medium in the drive housing cavity to flow through the gap of the sliding bearing assembly into the cavity of the rear end cover. Under the action of the centrifugal pump turbine blades, it is discharged from the cavity of the rear end cover and flows into the cavity of the front end cover through the medium flow channel. After flowing through the sliding bearing assembly in the front end cover, the lubricating medium returns to the drive housing cavity, thereby achieving simultaneous cooling of the bearings on both sides of the main shaft.

[0012] Preferably, the sliding bearing assembly includes an inner sliding bearing ring and an outer sliding bearing ring; the inner sliding bearing ring is interference-fitted with the main shaft and forms a friction pair with the outer sliding bearing ring of the main shaft;

[0013] The inner surface of the outer ring of the sliding bearing is provided with multiple grooves.

[0014] Preferably, the sliding bearing assembly further includes a metal bearing sleeve and an end face bearing;

[0015] The inner ring and outer ring of the sliding bearing are disposed within the metal bearing sleeve, and the metal bearing sleeve is disposed within the front and rear bearing cavities of the drive housing and is connected to the front end cover and the rear end cover.

[0016] The end face bearing is disposed inside the metal bearing sleeve;

[0017] Both the end face bearing and the metal bearing sleeve have flow ports corresponding to the grooves on the outer ring of the sliding bearing. The end face bearing has an annular guide groove near the inner ring of the sliding bearing so that the lubricating medium in the drive housing can flow through the grooves on the outer ring of the sliding bearing and communicate with the chamber of the rear end cover through the flow ports on the end face bearing and the metal bearing sleeve.

[0018] Preferably, it also includes a centrifugal pump inlet flange, which is connected to the chamber of the drive housing through the inner surface groove of the outer ring of the sliding bearing; when the main shaft rotates, the centrifugal pump inlet flange forms a negative pressure at the outlet of the inner surface groove of the outer ring of the sliding bearing, forcing the lubricating medium in the chamber of the drive housing to flow through the inner surface groove of the outer ring of the sliding bearing.

[0019] Preferably, both the end face bearing and the metal bearing sleeve are provided with multiple flow ports evenly distributed; the end face bearing and the metal bearing sleeve are positioned by multiple tapered pins.

[0020] Preferably, the end face bearing is made of polyetheretherketone (PEEK) material; the outer ring of the sliding bearing is made of PEEK material.

[0021] Preferably, the drive mechanism further includes a drive bearing, a connecting rod, and a bearing liner; the bearing liner is sleeved on the main shaft, the drive bearing is sleeved on the bearing liner, and one end of the connecting rod is connected to the drive bearing.

[0022] Preferably, the plunger distribution mechanism includes a plunger assembly, a plunger sleeve assembly, a distribution valve assembly, and a distribution valve end cap;

[0023] The plunger assembly is disposed within the plunger sleeve assembly; one end of the plunger assembly is connected to the connecting rod via a transmission pin, and the other end is connected to the distribution valve assembly; the distribution valve end cap is disposed on one side of the distribution valve assembly.

[0024] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0025] 1. This invention proposes a fully water-lubricated deep-sea ultra-high-pressure water pump. A centrifugal pump is installed within the rear cover cavity, with its turbine blades connected to the main shaft. The main shaft drives the turbine blades, and the centrifugal pump pumps lubricating medium from the rear cover cavity into the front cover cavity, enabling internal circulation of the lubricating medium within the pump. During operation, this provides excellent cooling for the outer ring of the sliding bearing and all friction pairs within the drive mechanism. When used as a power source for underwater work tools, the pump achieves self-lubrication in a closed-loop structure. Compared to existing technologies, the closed-loop structure eliminates the need for frequent filter replacements, improving efficiency and reducing the risk of suspended sand entering the pump.

[0026] 2. The present invention proposes a fully water-lubricated deep-sea ultra-high pressure water pump. Based on the self-lubricating characteristics of the outer ring structure of the sliding bearing, a centrifugal pump is installed in the rear cover cavity to achieve forced lubrication of the friction pair of the main shaft bearing. This solves the problem of the main shaft seizing due to excessive temperature of the friction pair of the main shaft bearing during operation of the ultra-high pressure water pump, and effectively improves the service life of the water pump.

[0027] 3. This invention proposes a fully water-lubricated deep-sea ultra-high-pressure water pump, employing a bidirectional six-groove sliding bearing outer ring supported by polyetheretherketone (PEEK) material, which exhibits excellent wear resistance and cushioning performance. The bidirectional groove structure effectively increases the bearing's contact area, reduces contact stress, and thus improves the bearing's resistance to deformation. Simultaneously, the bidirectional groove structure allows for bidirectional flow through the grooves in the bearing friction pair during pump operation, effectively improving the bearing's heat dissipation and load-bearing capacity.

[0028] 4. This invention proposes a fully water-lubricated deep-sea ultra-high-pressure water pump with a closed-loop self-circulating cooling structure. This eliminates the need for an external cooler or connection to the external marine environment for the main shaft bearing, thus solving the heat dissipation problem of the drive mechanism's friction pairs. Furthermore, to achieve lightweight design and considering the ultra-high pressure of the deep sea, multiple reinforcing ribs are machined on both the upper and lower sides of the pump casing, improving its strength and reliability. When the pump is used on land, these reinforcing ribs act as heat dissipation fins, enabling the pump to be used in both deep-sea and terrestrial environments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the cooling device in the fully water-lubricated deep-sea ultra-high pressure water pump according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the all-water lubricated deep-sea ultra-high pressure water pump according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the centrifugal pump turbine blades in the fully water-lubricated deep-sea ultra-high pressure water pump according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the outer ring of the sliding bearing in the fully water-lubricated deep-sea ultra-high pressure water pump according to an embodiment of the present invention.

[0033] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-medium flow channel; 2-drive bearing shell; 3-connecting rod; 4-crankcase cover plate; 5-ferrule fitting; 6-rear end cover; 7-set screw; 8-centrifugal pump turbine blade; 9-centrifugal pump inlet flange; 10-end face bearing; 11-drive housing; 12-crankcase cover plate screw; 13-pressure compensation pipe interface; 14-metal bearing sleeve; 15-sliding bearing outer ring; 16-sliding bearing inner ring; 17-main shaft; 18-mechanical seal; 19-front end cover; 20-O-ring; 21-bearing shell liner; 22-distribution valve assembly; 23-plunger sleeve assembly; 24-plunger assembly; 25-side end cover; 26-rear end cover plate; 27-drive pin; 28-distribution valve end cover. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1-4 As shown, this invention proposes a fully water-lubricated deep-sea ultra-high-pressure water pump. The pump includes a drive mechanism, a plunger distribution mechanism, and a cooling mechanism. It comprises a drive housing 11, a front cover 19, a centrifugal pump inlet flange 9, centrifugal pump turbine blades 8, a medium flow channel 1, a rear cover plate 26, and a compression fitting 5. One end of the drive housing 11 is connected to the front cover 19, and the other end is connected to the rear cover 6. The rear cover 6 has a centrifugal pump outlet, which is connected to the medium flow channel 1 via the compression fitting 5. The other end of the medium flow channel 1 is connected to the front cover 19 via the compression fitting 5. The metal bearing sleeve 14 is assembled inside the front end cover 19 and the rear end cover 6. The outer ring 15 of the sliding bearing is assembled inside the metal bearing sleeve 14. The inner ring 16 of the sliding bearing is interference-fitted with the main shaft 17 and serves as a friction pair with the outer ring 15 of the sliding bearing. The centrifugal pump turbine blade 8 connected to the main shaft 17 is installed in the cavity of the rear end cover 6. The centrifugal pump turbine blade 8 is mounted on the main shaft 17 by set screws 7. The centrifugal pump outlet is connected to the front end cover 19 by a compression fitting 5 and the medium flow channel 1. At the same time, the front end cover 19 and the rear end cover 14 are respectively connected to the two ends of the main shaft 17 through the outer ring 15 of the sliding bearing, thereby driving the main shaft 17 to rotate. A mechanical seal 18 is installed between the front end cover 19 and the main shaft 17. The drive bearing 2 includes a front drive bearing and a rear drive bearing, which are fitted with crank pins on the main shaft 17.

[0036] To further explain, the rear end cover 6 has a cylindrical cavity, and the centrifugal pump turbine blades 8 are placed inside the rear end cover cavity and connected to the main shaft 17. The centrifugal pump inlet flange 9 is connected to the sliding bearing flow channel in the rear end cover 6. When the main shaft 17 rotates, it drives the centrifugal pump turbine blades 8 to rotate, forcing the liquid in the rear end cover cavity out. The liquid discharged from the rear end cover cavity creates a negative pressure, causing the lubricating medium in the drive housing 11 cavity to flow through the groove on the inner surface of the sliding bearing outer ring 15 and enter the rear end cover 6 cavity. The liquid passes through the medium flow channel 1 and enters the front end cover 19 cavity. The liquid in the front end cover 19 cavity is forced into the groove of the sliding bearing outer ring 15 and enters the drive housing 11, achieving forced lubrication of the main shaft bearing friction pair. This solves the problem of the main shaft seizing due to excessive temperature during operation of the ultra-high pressure water pump main shaft bearing friction pair, effectively improving the service life of the water pump.

[0037] Furthermore, a crankcase cover plate 4 is provided on the drive housing 11, and the crankcase cover plate 4 is fixedly installed on the drive housing 11 by crankcase cover plate screws 12.

[0038] Furthermore, to improve the water pump's sealing performance, an O-ring 20 is provided at the connection between the front cover 19 and the drive housing 11.

[0039] Further explanation: the plunger distribution mechanism includes a plunger assembly 24, a plunger sleeve assembly 23, a distribution valve assembly 22, and a distribution valve end cap 28; the plunger assembly 24 is disposed within the plunger sleeve assembly 23; one end of the plunger assembly 24 is connected to the connecting rod 3 via a transmission pin 27, and the other end is connected to the distribution valve assembly 22; the distribution valve end cap 28 is disposed on one side of the distribution valve assembly 22. The structure of the seawater pump in this invention is suitable for the needs of all-water lubrication power sources for various deep-sea equipment in all depths of the ocean, and can also be used as an ultra-high pressure water-lubricated pump on land. Furthermore, this embodiment only includes three sets of plungers and related water-lubricated sliding bearing assemblies; when necessary, this patent is applicable to water-lubricated high-pressure water pumps with any number of plungers.

[0040] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0041] like Figure 1-4 As shown, this invention proposes a fully water-lubricated deep-sea ultra-high-pressure water pump, wherein a centrifugal pump is configured at the rear end cover, and the front and rear covers are connected by an independent flow channel. The centrifugal pump inlet is connected to the outlet of the sliding bearing flow channel, and the centrifugal pump outlet is connected to an external independent flow channel. Compared with common open systems, this structure isolates the pump from external marine suspended sand while enabling the lubricating medium within the casing cavity to circulate through the grooves on the inner surface of the bearing outer ring under the action of the centrifugal pump. This improves the heat dissipation efficiency and lubrication performance of the main shaft bearing, significantly alleviating the problem of severe frictional heat generation in the main shaft bearing of a fully water-lubricated seawater pump under high-speed, heavy-load conditions.

[0042] This seawater pump includes a drive mechanism, a plunger distribution mechanism, and a cooling mechanism. It includes a front cover 19, a rear cover 6, a drive housing 11, and a side cover 25. It also includes a rotating main shaft 17, a drive bearing 2, a transmission pin 27, and a connecting rod 3 inside the drive housing. The front and rear covers are connected to the drive housing and are also connected to both ends of the main shaft via water-lubricated sliding bearings, thereby driving the main shaft to rotate. The side cover 25 is connected to the side of the drive housing 11 and has a pressure compensation pipe interface 13, which maintains pressure balance inside and outside the drive housing under deep-sea conditions. For land-based experiments, the interface can be sealed with a plug. One end of the connecting rod 3 is fitted with the drive bearing 2 on the main shaft 17, and the other end is connected to the plunger distribution mechanism via a composite transmission pin. During operation, the rotating main shaft drives the connecting rod to reciprocate. The plunger distribution mechanism includes a plunger assembly 24, a plunger sleeve assembly 23, and a distribution unit. The distribution unit includes a distribution valve assembly 22, the same number as the plunger assembly, and a valve body. The plunger assembly 24 is installed inside the plunger sleeve assembly 23. During operation, the plunger assembly 24 reciprocates within the plunger sleeve assembly 23 under the drive of the connecting rod 3, thereby completing water intake and drainage through the distribution valve assembly. The cooling mechanism consists of a centrifugal pump and a bidirectional six-groove water-lubricated sliding bearing assembly. The centrifugal pump impeller is mounted on the main shaft. The centrifugal pump inlet is connected to the water pump drive chamber through the sliding bearing groove. The centrifugal pump outlet connects to the front and rear end cover chambers through an independent flow channel. The front end cover chamber is connected to the drive chamber through the sliding bearing groove at the other end. The centrifugal pump impeller is connected to the main shaft by screws. Under the drive of the rotating main shaft, centrifugal force is generated. This causes the water in the rear end cover chamber to separate and be thrown towards the edge of the impeller, thus being forced out from the centrifugal pump outlet. Water is then forced into the front end cover chamber through an external independent flow channel, creating negative pressure in the rear end cover chamber. Water from the drive chamber is drawn into the bearing clearance, while the lubricating medium flows through the bearing grooves into the hydraulic chamber of the rear end cover, achieving cooling and lubrication of the main shaft sliding bearing. Simultaneously, the front and rear end cover cavities are connected by independent flow channels. A centrifugal pump forces water from the rear end cover cavity into the front end cover cavity, and the water in the front end cover cavity flows through the bearing grooves back into the drive chamber. This allows the pressurized water generated by a single-sided centrifugal pump to simultaneously cool both sides of the main shaft bearings.

[0043] As a further preferred embodiment, the centrifugal pump assembly includes an inlet flange, a 6-blade turbine, a centrifugal pump chamber, a centrifugal pump outlet, and an independent flow channel. The 6-blade turbine is connected to the main shaft by threads and fixed to the main shaft. When an external motor drives the main shaft to rotate, the main shaft drives the 6-blade turbine to rotate simultaneously, thereby enabling the centrifugal pump to operate.

[0044] As a further preferred embodiment, the bidirectional six-groove water-lubricated bearing assembly includes a metal bearing inner ring, a PEEK sliding bearing outer ring, an end face bearing, a metal bearing sleeve, and a cylindrical pin. The PEEK sliding bearing outer ring and the end face bearing are housed within the metal bearing sleeve, which is located within the front and rear bearing cavities of the drive housing and connected to the front and rear end cover cavities. The metal bearing inner ring is interference-fitted with the main shaft. During operation of the seawater pump, the metal bearing inner ring and the PEEK sliding bearing outer ring form a friction pair. Both the end face bearing and the metal bearing sleeve have flow ports corresponding to the grooves of the PEEK sliding bearing outer ring. The end face bearing has an annular guide groove near the inner ring, allowing the lubricating medium in the drive cavity to flow through the grooves of the PEEK sliding bearing outer ring and communicate with the centrifugal pump through the flow ports on the end face bearing and the metal bearing sleeve, thus achieving bearing heat dissipation.

[0045] As a further preferred embodiment, the centrifugal pump inlet flange is connected to the drive cavity through the groove on the inner surface of the outer ring of the PEEK sliding bearing, forming a negative pressure at the outlet of the groove on the outer ring of the PEEK sliding bearing, which forces the lubricating medium in the drive cavity to flow through the groove on the outer ring of the PEEK sliding bearing, effectively improving the heat dissipation capacity and hydrodynamic lubrication performance of the outer ring of the PEEK sliding bearing.

[0046] As a further preferred embodiment, the end-face bearing is made of PEEK material and has eight evenly distributed flow ports and an annular flow groove on the near-bearing end face, with the annular flow groove connecting the flow ports. Under the action of the groove on the inner surface of the outer ring of the PEEK sliding bearing and the negative pressure at the centrifugal pump inlet, the lubricating medium flows through the inner surface of the outer ring of the PEEK sliding bearing. Under the guidance of the flow guide groove on the end-face bearing, it is drawn into the centrifugal pump from the centrifugal pump inlet flange through the flow ports on the end-face bearing and the metal bearing sleeve, thus realizing the circulation of the lubricating medium in the seawater pump.

[0047] As a further preferred embodiment, the end face bearing and the metal bearing sleeve are provided with eight evenly distributed flow ports, and are positioned using four tapered pins. This ensures that the flow ports will not shift due to friction during operation, preventing blockage of the flow ports during seawater pump operation. This would prevent the lubricating medium flowing through the outer ring of the PEEK sliding bearing from entering the centrifugal pump chamber, thus hindering its circulation within the seawater pump. Consequently, the outer ring of the PEEK sliding bearing would not dissipate heat effectively, potentially leading to thermal seizure of the main shaft friction pair.

[0048] As a further preferred embodiment, the centrifugal pump outlet connects the front end cover cavity and the centrifugal pump cavity via the independent flow channel. The centrifugal pump inlet is connected to the outlet of the outer ring groove of the PEEK sliding bearing. The lubricating medium in the drive cavity is drawn into the centrifugal pump cavity from the outer ring groove of the PEEK sliding bearing, and then forced into the centrifugal pump outlet by the 6-blade turbine. The lubricating medium flows through the independent flow channel and enters the front end cover cavity. The sliding bearing assembly is installed in the front end cover cavity and is symmetrically distributed with the sliding bearing assembly in the rear end cover cavity. Under the action of the centrifugal pump, the lubricating medium flows through the flow ports on the end face bearing and the metal bearing sleeve, through the sliding bearing groove, and into the drive cavity, realizing the circulation of the lubricating medium in the cavity.

[0049] As a further preferred embodiment, the bidirectional six-groove structure of the outer ring of the PEEK sliding bearing effectively increases the contact area between the bearing and the spindle by reducing the contact stress. At the same time, the bidirectional groove structure enables bidirectional flow through the bearing end face during operation, avoiding the formation of a circulating dead cavity in the end cover cavity and realizing the circulating heat dissipation of the outer ring of the PEEK sliding bearing.

[0050] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fully water-lubricated deep-sea ultra-high-pressure water pump, characterized in that, Includes a drive mechanism, a plunger distribution mechanism, a cooling mechanism, and a side end cap (25); The plunger distribution mechanism is connected to the drive mechanism, which includes a drive housing (11) and a main shaft (17) disposed in the drive housing (11). The cooling mechanism includes a front cover (19), a rear cover (6), centrifugal pump turbine blades (8), a medium flow channel (1), and a sliding bearing assembly; The front end cover (19) and the rear end cover (6) are respectively disposed at both ends of the drive housing (11); the sliding bearing assembly is disposed at both ends of the main shaft (17) and has a gap for the flow of lubricating medium; The centrifugal pump turbine blades (8) are disposed in the cavity of the rear end cover (6) and are fixedly installed at the end of the main shaft (17) and rotate synchronously with the main shaft (17); The two ends of the medium flow channel (1) are respectively connected to the openings of the front end cover (19) and the rear end cover (6); During operation, the main shaft (17) drives the centrifugal pump turbine blades (8) to rotate, thereby driving the lubricating medium in the drive housing (11) cavity to flow through the gap of the sliding bearing assembly into the cavity of the rear end cover (6). Under the action of the centrifugal pump turbine blades (8), it is pushed out from the cavity of the rear end cover (6) and flows into the cavity of the front end cover (19) through the medium flow channel (1). After the lubricating medium flows through the sliding bearing assembly in the front end cover, it returns to the drive housing (11) cavity, thereby achieving simultaneous cooling of the double-sided bearings of the main shaft. The sliding bearing assembly includes a sliding bearing inner ring (16), a sliding bearing outer ring (15), a metal bearing sleeve (14), and an end face bearing (10); the sliding bearing inner ring (16) is interference-fitted with the main shaft (17) and forms a friction pair of the main shaft (17) with the sliding bearing outer ring (15); the sliding bearing inner ring (16) and the sliding bearing outer ring (15) are disposed inside the metal bearing sleeve (14), the metal bearing sleeve (14) is disposed in the front and rear bearing cavities of the drive housing (11), and is connected to the front end cover (19) and the rear end cover (6); the end face bearing (10) is disposed inside the metal bearing sleeve (14); The inner surface of the outer ring (15) of the sliding bearing is provided with multiple grooves; it also includes a centrifugal pump inlet flange (9), which is connected to the chamber of the drive housing (11) through the inner surface groove of the outer ring (15) of the sliding bearing; when the main shaft (17) rotates, the centrifugal pump inlet flange (9) forms a negative pressure at the outlet of the inner surface groove of the outer ring (15) of the sliding bearing, which forces the lubricating medium in the chamber of the drive housing (11) to flow through the inner surface groove of the outer ring (15) of the sliding bearing; The double-sided six-groove water-lubricated bearing assembly includes a metal bearing inner ring, a PEEK sliding bearing outer ring, an end face bearing, a metal bearing sleeve, and a cylindrical pin. The PEEK sliding bearing outer ring and the end face bearing of the double-sided six-groove water-lubricated bearing assembly are housed within the metal bearing sleeve of the double-sided six-groove water-lubricated bearing assembly. The metal bearing sleeve of the double-sided six-groove water-lubricated bearing assembly is located within the front and rear bearing cavities of the drive housing and connected to the front and rear end cover cavities. The metal bearing inner ring of the double-sided six-groove water-lubricated bearing assembly is interference-fitted with the main shaft. When the seawater pump is operating, the metal bearing inner ring and the PEEK sliding bearing outer ring of the double-sided six-groove water-lubricated bearing assembly form a friction pair. Both the end face bearing of the bidirectional six-groove water-lubricated bearing assembly and the metal bearing sleeve of the bidirectional six-groove water-lubricated bearing assembly are provided with flow ports corresponding to the grooves of the outer ring of the PEEK sliding bearing. The end face bearing of the bidirectional six-groove water-lubricated bearing assembly is provided with an annular guide groove near the inner ring of the sliding bearing of the bidirectional six-groove water-lubricated bearing assembly, so that the lubricating medium in the drive housing (11) can flow through the grooves of the outer ring of the PEEK sliding bearing and communicate with the chamber of the rear end cover (6) through the flow ports on the end face bearing of the bidirectional six-groove water-lubricated bearing assembly and the metal bearing sleeve of the bidirectional six-groove water-lubricated bearing assembly. The side end cover (25) is connected to the side of the drive housing (11) and has a pressure compensation pipe interface (13) so that the pressure inside and outside the drive housing is balanced under deep-sea conditions.

2. The all-water lubricated deep-sea ultra-high pressure water pump according to claim 1, characterized in that, Both the end face bearing and the metal bearing sleeve of the bidirectional six-groove water-lubricated bearing assembly are provided with multiple evenly distributed flow ports; the end face bearing and the metal bearing sleeve of the bidirectional six-groove water-lubricated bearing assembly are positioned by multiple tapered pins.

3. The all-water lubricated deep-sea ultra-high pressure water pump according to claim 2, characterized in that, The end face bearing of the bidirectional six-groove water-lubricated bearing assembly is made of polyetheretherketone (PEEK).

4. A fully water-lubricated deep-sea ultra-high pressure water pump according to any one of claims 1-3, characterized in that, The drive mechanism also includes a drive bearing (2), a connecting rod (3), and a bearing liner (21); the bearing liner (21) is sleeved on the main shaft (17), the drive bearing (2) is sleeved on the bearing liner (21), and one end of the connecting rod (3) is connected to the drive bearing (2).

5. A fully water-lubricated deep-sea ultra-high pressure water pump according to claim 4, characterized in that, The plunger distribution mechanism includes a plunger assembly (24), a plunger sleeve assembly (23), a distribution valve assembly (22), and a distribution valve end cap (28). The plunger assembly (24) is disposed inside the plunger sleeve assembly (23); one end of the plunger assembly (24) is connected to the connecting rod (3) via a transmission pin (27), and the other end is connected to the distribution valve assembly (22); the distribution valve end cap (28) is disposed on one side of the distribution valve assembly (22).

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