A buoyancy regulating plunger pump device for full-sea-depth submersible

Abstract

The present invention discloses a buoyancy regulating plunger pump device for full-sea-depth submersibles, comprising an input valve group, an output valve group, a pressure-resistant cylinder and a reciprocating drive piston mechanism; the pressure-resistant cylinder comprises an input insertion hole, an output insertion hole and a drive insertion hole, the input insertion hole and the output insertion hole are located on the same axis, the drive insertion hole intersects the axis vertically to form a T-shaped channel; the three insertion holes are all provided with internal threads; the input valve group, the output valve group and the reciprocating drive piston mechanism are respectively located in the input insertion hole, the output insertion hole and the drive insertion hole of the pressure-resistant cylinder, and are all fixed by threads. The device can work at full sea depth, the main motion structure withstands the huge external seawater pressure through the pressure-bearing components, can ensure the reliable operation of the system, the equipment is simple, and the mechanical efficiency and volumetric efficiency are high.

Description

Technical Field

[0001] The invention belongs to the technical field of submersibles and relates to a buoyancy regulating device, in particular to a buoyancy regulating plunger pump device for a full-sea-depth submersible. Background Art

[0002] With the continuous development of science and technology, human exploration of the ocean is becoming more and more in-depth, and deep-sea submersibles are often needed. At present, deep-sea submersibles, especially deep-sea manned submersibles and unmanned submersibles, need a buoyancy adjustment system to adjust the buoyancy of the submersible during underwater movement, so as to adjust the submersible's buoyancy or diving, and compensate for the buoyancy changes caused by changes in the external environment. Using seawater to adjust the buoyancy state of the submersible is a very simple and practical way, but the buoyancy adjustment of the full-sea-depth submersible faces the impact of the pump body on the huge external working environment seawater pressure, and the effect of the external seawater pressure can even reach more than 115MPa; in addition, since the usual deep-sea manned submersibles are powered by batteries, their energy supply is always limited. For this reason, a full-sea-depth buoyancy adjustment device with high mechanical efficiency and volumetric efficiency that can work reliably in a full-sea-depth environment is needed.

[0003] The existing submersible buoyancy control devices have the following main problems: (1) The working water depth is not deep enough, basically working in an environment within 70MPa, and cannot reach the working environment of 115MPa at full sea depth; (2) The implementation is complex and the reliability is low. The high-pressure seawater pumps with valve distribution or shaft distribution have a large number of internal parts, a complex equipment structure, and too many matching parts. Under the external high-pressure environment, the parts themselves are prone to deformation, causing the equipment to wear too quickly or even fail to work; (3) The mechanical efficiency and volumetric efficiency are too low. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention provides a buoyancy regulating plunger pump device for a full-sea-depth submersible, which can operate at full sea depth. The main moving structure withstands the huge external seawater pressure through pressure-bearing components, thereby ensuring the reliable operation of the system. The equipment is simple and the mechanical efficiency and volumetric efficiency are high.

[0005] To this end, the present invention adopts the following technical solutions:

[0006] A buoyancy regulating plunger pump device for a full-sea-depth submersible, comprising an input valve group, an output valve group, a pressure-resistant cylinder and a reciprocating drive piston mechanism; the pressure-resistant cylinder comprises an input insertion hole, an output insertion hole and a drive insertion hole, the input insertion hole and the output insertion hole are located on the same axis, the drive insertion hole intersects the axis vertically to form a T-shaped channel; the three insertion holes are all provided with internal threads; the input valve group is located in the input insertion hole of the pressure-resistant cylinder, fixed by threads, and sealed by an O-ring on the input valve group; the output valve group is located in the output insertion hole of the pressure-resistant cylinder, fixed by threads, and further sealed by an O-ring on the output valve group; the reciprocating drive piston mechanism is located in the drive insertion hole of the pressure-resistant cylinder, fixed by threads, and sealed by an O-ring on the drive insertion hole of the pressure-resistant cylinder.

[0007] Preferably, the input valve group is connected to the adjustable ballast water tank of the submersible, and is used to suck the normal pressure ballast water of the adjustable ballast water tank of the submersible into the plunger pump body, and at the same time provide a seal between the adjustable ballast water tank and the plunger pump body; the output valve group is connected to the external seawater, and is used to discharge the water in the plunger pump body into the external seawater, and at the same time provide a seal between the plunger pump body and the external seawater; the reciprocating drive piston mechanism is connected to the reciprocating drive mechanism with a power source, and is used to drive the piston movement; the pressure-resistant cylinder body is connected to the housing of the power source through a bolt hole.

[0008] Preferably, the input valve group includes a connector, an input valve seat, a lower support seat for an input valve core return spring, an input valve core return spring, an upper support seat for an input valve core return spring, an input valve core, and an O-ring, which are arranged in sequence along the axial direction; the external thread on the input valve seat is matched and fixed with the internal thread on the input insertion hole of the pressure-resistant cylinder body, and the other side of the shaft end is tightly attached to the upper step of the inner hole of the input insertion hole, and the shaft end and the input insertion hole step form a groove, and an O-ring is placed on the groove; the connector is axially fastened to the input valve seat by a thread, and one end face of the connector is provided with There is a grooved O-ring, and the other side of the O-ring is tightly attached to the input valve seat; the upper side of the upper support seat of the input valve core reset spring is tightly attached to a conical surface inside the input valve seat, and an inner groove is provided on it for placing the input valve core reset spring; the other side of the input valve core reset spring is tightly attached to the lower support seat of the input valve core reset spring; the axial thread of the lower support seat of the input valve core reset spring is fastened with the thread of the shaft end on one side of the input valve core; a convex conical surface is provided on the other side of the input valve core shaft end, and the concave conical surface cooperates with the inner concave conical surface of the top shaft end of the input valve seat.

[0009] Furthermore, the convex conical surface of the input valve core has an included angle of 89°; and the concave conical surface of the input valve seat has an included angle of 90°.

[0010] Furthermore, the Rockwell hardness difference between the input valve seat and the input valve core is at least greater than 5 HRC.

[0011] Preferably, the output valve group includes a connector, an output valve seat, an output valve core reset spring support seat, an output valve core reset spring, an output valve core, and an O-ring, which are arranged in sequence along the axial direction; the external thread on the output valve seat is matched and fixed with the internal thread on the output plug-in hole of the pressure-resistant cylinder body, and the shaft end on the other side is tightly attached to the step on the inner hole of the output plug-in hole; the shaft end and the step of the output plug-in hole form a groove, and the O-ring is placed on the groove; the connector is axially fastened to the output valve seat through a thread, and a groove O-ring is provided on one end face of the connector, and the other side of the O-ring is tightly attached to the output valve seat; the axial thread on one side of the output valve core reset spring support seat is fastened with the thread in the output valve seat; the other side of the output valve core reset spring support seat is provided with an inner groove for placing the output valve core reset spring; the other side of the output valve core reset spring is tightly attached to the shaft shoulder on one side of the output valve core; the other side of the output valve core shaft end is provided with a convex conical surface, which cooperates with an inner concave conical surface at the inner hole at the bottom of the output valve seat.

[0012] Furthermore, the convex conical surface of the output valve core has an included angle of 89.5°; and the concave conical surface of the output valve seat has an included angle of 90°.

[0013] Furthermore, the Rockwell hardness difference between the output valve seat and the output valve core is at least greater than 5HRC.

[0014] Preferably, the reciprocating drive piston mechanism comprises a wear-resistant ring, an O-ring, a support ring, a piston and a piston sealing assembly, which are arranged in sequence along the axial direction; the support ring is fixed by the external thread on it and the internal thread of the drive insertion hole on the pressure-resistant cylinder body, and the other side of the shaft end is in close contact with the step on the inner hole of the wear-resistant ring; the wear-resistant ring is provided with a protruding annular shaft to cooperate with the drive insertion hole on the pressure-resistant cylinder body, and the drive insertion hole is provided with an O-ring on the groove at this position, and the inner side of the O-ring cooperates with the annular shaft of the wear-resistant ring; one side of the wear-resistant ring An outer arc surface is provided at the shaft end, and the arc surface cooperates with the inner arc surface on the driving insertion hole; the outer diameter of a section of the shaft between the protruding annular shaft and the outer arc surface on the wear-resistant ring is slightly smaller than the driving insertion hole at this position; the wear-resistant ring is provided with an inner hole, and the inner hole cooperates with the piston, and the piston can move flexibly along the axial direction of the inner hole of the wear-resistant ring; a groove is provided on the piston, and a piston sealing assembly is placed in the groove, and the outer diameter of the piston sealing assembly cooperates with the inner hole of the wear-resistant ring; the inner side of the piston sealing assembly is an O-ring, and the outer side is covered with a polyurethane outer ring.

[0015] Furthermore, the Rockwell hardness difference between the wear-resistant ring and the piston is at least greater than 5HRC.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) It can work at full ocean depth and provide buoyancy adjustment capability for full ocean depth submersibles. The working water depth is much higher than that of existing buoyancy adjustment devices of the same type.

[0018] (2) High mechanical efficiency and volumetric efficiency.

[0019] (3) Flexible configuration is possible. Multiple piston pumps can work in parallel to provide the system flow, or work in series to provide the system output pressure.

[0020] (4) The equipment is simple and highly reliable. When the equipment is adequately lubricated, the wear of moving parts can be basically ignored; the main moving structure withstands the huge external seawater pressure through pressure-bearing parts, which can ensure the reliable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of the overall structure of a buoyancy regulating plunger pump device for a full-sea-depth submersible.

[0022] Figure 2 The present invention provides a general assembly diagram of the overall structure of a buoyancy regulating plunger pump device for a full-sea-depth submersible.

[0023] Figure 3 It is a schematic diagram of the input valve seat structure.

[0024] Figure 4 It is a schematic diagram of the input valve core structure.

[0025] Figure 5 It is a schematic diagram of the output valve seat structure.

[0026] Figure 6 It is a schematic diagram of the output valve core structure.

[0027] Explanation of the accompanying drawings: Ⅰ, input valve group; Ⅱ, pressure-resistant cylinder; Ⅲ, output valve group; Ⅳ, reciprocating drive piston mechanism; 1, connector; 2, O-ring; 3, input valve seat; 4, O-ring; 5, O-ring; 6, support ring; 7, piston; 8, piston sealing assembly; 9, wear-resistant ring; 10, pressure-resistant cylinder body; 11, output valve seat; 12, output valve core reset spring; 13, output valve core reset spring support seat; 14, output valve core; 15, input valve core; 16, input valve core reset spring upper support seat; 17, input valve core reset spring; 18, input valve core reset spring lower support seat. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the specific embodiments and descriptions are only used to explain the present invention but are not intended to limit the present invention.

[0029] like Figure 1 As shown, the present invention discloses a buoyancy regulating plunger pump device for a full-sea-depth submersible, comprising an input valve group I, an output valve group III, a pressure-resistant cylinder II and a reciprocating drive piston mechanism IV; the pressure-resistant cylinder II comprises an input insertion hole, an output insertion hole and a drive insertion hole, the input insertion hole and the output insertion hole are located on the same axis, the drive insertion hole intersects the axis vertically to form a T-shaped channel; the three insertion holes are all provided with internal threads; the input valve group I is located in the input insertion hole of the pressure-resistant cylinder II, fixed by threads, and sealed by an O-ring on the input valve group I; the output valve group III is located in the output insertion hole of the pressure-resistant cylinder II, fixed by threads, and further sealed by an O-ring on the output valve group III; the reciprocating drive piston mechanism IV is located in the drive insertion hole of the pressure-resistant cylinder II, fixed by threads, and sealed by an O-ring on the drive insertion hole of the pressure-resistant cylinder II.

[0030] Specifically, the input valve group I is connected to the adjustable ballast water tank of the submersible, and is used to suck the normal pressure ballast water of the adjustable ballast water tank of the submersible into the plunger pump body, and at the same time provide a seal between the adjustable ballast water tank and the plunger pump body; the output valve group III is connected to the external seawater, and is used to discharge the water in the plunger pump body into the external seawater, and at the same time provide a seal between the plunger pump body and the external seawater; the reciprocating drive piston mechanism IV is connected to the reciprocating drive mechanism with a power source, and is used to drive the piston movement; the pressure-resistant cylinder body II is connected to the housing of the power source through a bolt hole.

[0031] Specifically, Figure 2As shown, the input valve group I includes a connector 1, an input valve seat 3, a lower support seat 18 for an input valve core return spring, an input valve core return spring 17, an upper support seat 16 for an input valve core return spring, an input valve core 15, and an O-ring 4, which are arranged in sequence along the axial direction; the external thread on the input valve seat 3 is matched and fixed with the internal thread on the input insertion hole of the pressure-resistant cylinder body 10, and the other side of the shaft end is tightly attached to the upper step of the inner hole of the input insertion hole, and the shaft end and the input insertion hole step form a groove, and an O-ring 4 is placed on the groove; the connector 1 is axially fastened to the input valve seat 3 by a thread, and one end face of the connector 1 A grooved O-ring 2 is provided, and the other side of the O-ring 2 is tightly attached to the input valve seat 3; the upper side of the input valve core reset spring upper support seat 16 is tightly attached to a conical surface inside the input valve seat 3, and an inner groove is provided on it for placing the input valve core reset spring 17; the other side of the input valve core reset spring 17 is tightly attached to the input valve core reset spring lower support seat 18; the axial thread of the input valve core reset spring lower support seat 18 is fastened with the thread of the shaft end on one side of the input valve core 15; the other side of the shaft end of the input valve core 15 is provided with a convex conical surface, which cooperates with the concave conical surface of the top shaft end of the input valve seat 3.

[0032] Specifically, Figure 3 and Figure 4 As shown, the convex conical surface of the input valve core 15 has an included angle of 89°; the concave conical surface of the input valve seat 3 has an included angle of 90°.

[0033] Specifically, the Rockwell hardness difference between the input valve seat 3 and the input valve core 15 is at least greater than 5 HRC.

[0034] Specifically, Figure 2 As shown, the output valve group III includes a connector 1, an output valve seat 11, an output valve core reset spring support seat 13, an output valve core reset spring 12, an output valve core 14, and an O-ring 4, which are arranged in sequence along the axial direction; the external thread on the output valve seat 11 is matched and fixed with the internal thread on the output plug-in hole of the pressure-resistant cylinder body 10, and the other side of the shaft end is in close contact with the lower step of the inner hole of the output plug-in hole; the shaft end and the output plug-in hole step form a groove, and the O-ring 4 is placed on the groove; the connector 1 is axially fastened to the output valve seat 11 through a thread, and one end face of the connector A grooved O-ring 2 is provided, and the other side of the O-ring 2 is in close contact with the output valve seat 11; the axial thread on one side of the output valve core reset spring support seat 13 is fastened with the thread in the output valve seat 11; the other side of the output valve core reset spring support seat 13 is provided with an inner groove for accommodating the output valve core reset spring 12; the other side of the output valve core reset spring 12 is in close contact with the shaft shoulder on one side of the output valve core 14; the other side of the axial end of the output valve core 14 is provided with a convex conical surface, which cooperates with an inner concave conical surface at the inner hole at the bottom of the output valve seat 11.

[0035] Specifically, Figure 5 and Figure 6 As shown, the convex conical surface of the output valve core 14 has an included angle of 89.5°; the concave conical surface of the output valve seat 11 has an included angle of 90°.

[0036] Specifically, the Rockwell hardness difference between the output valve seat 11 and the output valve core 14 is at least greater than 5 HRC.

[0037] Specifically, Figure 2 As shown, the reciprocating drive piston mechanism IV includes a wear-resistant ring 9, an O-ring 5, a support ring 6, a piston 7 and a piston sealing assembly 8, which are arranged in sequence along the axial direction; the support ring 6 is fixed by the external thread thereon and the internal thread of the drive insertion hole on the pressure-resistant cylinder body 10, and the other side of the shaft end is in close contact with the step on the inner hole of the wear-resistant ring 9; the wear-resistant ring 9 is provided with a protruding annular shaft to cooperate with the drive insertion hole on the pressure-resistant cylinder body 10, and the drive insertion hole is provided with an O-ring 5 on the groove at this position, and the inner side of the O-ring 5 cooperates with the annular shaft of the wear-resistant ring 9; the wear-resistant An outer arc surface is provided on one side of the axial end of the ring 9, and the arc surface cooperates with the inner arc surface on the drive insertion hole; the outer diameter of a section of the shaft between the protruding annular shaft and the outer arc surface on the wear-resistant ring 9 is slightly smaller than the drive insertion hole at this position; the wear-resistant ring 9 is provided with an inner hole, which cooperates with the piston 7, and the piston 7 can move flexibly along the axial direction of the inner hole of the wear-resistant ring 9; the piston 7 is provided with a groove, and a piston sealing assembly 8 is placed in the groove, and the outer diameter of the piston sealing assembly 8 cooperates with the inner hole of the wear-resistant ring 9; the inner side of the piston sealing assembly 8 is an O-ring, and the outer side is covered with a polyurethane outer ring.

[0038] Specifically, the Rockwell hardness difference between the wear-resistant ring 9 and the piston 7 is at least greater than 5 HRC.

[0039] Example

[0040] A buoyancy regulating plunger pump device used in a full-sea-depth submersible, the buoyancy regulating plunger pump can be driven by reciprocating motion driven by a motor, an oil motor or an oil cylinder, so as to discharge the normal pressure seawater in the adjustable ballast water tank in the submersible to the working water depth of the submersible, so as to achieve the purpose of adjusting the buoyancy of the submersible. The device mainly includes an input valve group, an output valve group, a reciprocating drive piston mechanism and a pressure-resistant cylinder body. The pressure-resistant cylinder body includes an input plug hole, an output plug hole and a drive plug hole, the input plug hole and the output plug hole are on an axis, and the drive plug hole intersects with the axis vertically to form a T-shaped channel. The input valve group is installed in the input insertion hole of the pressure-resistant cylinder body, is tightened and fixed by threads, and is sealed by the O-ring on the input valve group; the output valve group is installed in the output insertion hole of the pressure-resistant cylinder body, is tightened and fixed by threads, and is sealed by the O-ring on the output valve group; the reciprocating piston mechanism is installed in the drive insertion hole of the pressure-resistant cylinder body, is tightened and fixed by threads, and is sealed by the O-ring on the drive insertion hole of the pressure-resistant cylinder body. The input valve group is generally directly or indirectly connected to the adjustable ballast water tank of the submersible. The input valve group can suck the normal pressure ballast water of the adjustable ballast water tank of the submersible into the plunger pump body through the negative pressure generated by the reciprocating drive piston in the plunger pump, and at the same time provide a seal between the adjustable ballast water tank and the plunger pump body when the piston of the reciprocating drive piston mechanism squeezes into the plunger pump body; the output valve group is generally directly or indirectly connected to the external seawater, and when the piston of the reciprocating drive piston mechanism squeezes into the plunger pump body, the water in the plunger pump body is directly or indirectly discharged into the external seawater through the output valve group, and when the piston of the reciprocating drive piston mechanism is pulled out of the plunger pump body, a seal is provided between the plunger pump body and the external seawater; the reciprocating drive piston mechanism is generally connected to the reciprocating drive mechanism of a power source such as a motor, an oil motor or an oil cylinder; the pressure-resistant cylinder body can be connected to the shell of a power source such as a motor, an oil motor or an oil cylinder through four bolt holes thereon. The present invention has a compact structure and is easy to maintain. It can realize parallel or series connection of multiple pumps to increase system displacement or provide system pressure. The various parts of the plunger pump work in coordination to achieve the purpose of adjusting the buoyancy of the submersible within the full sea depth range.

[0041] The above description is only 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A buoyancy regulating plunger pump device for a full-sea-depth submersible, comprising an input valve group, an output valve group, a pressure-resistant cylinder and a reciprocating drive piston mechanism, characterized in that: The pressure-resistant cylinder body comprises an input insertion hole, an output insertion hole and a driving insertion hole, wherein the input insertion hole and the output insertion hole are located on the same axis, and the driving insertion hole intersects the axis vertically to form a T-shaped channel; internal threads are arranged in the three insertion holes; the input valve group is located in the input insertion hole of the pressure-resistant cylinder body, fixed by threads, and sealed by an O-ring on the input valve group; the output valve group is located in the output insertion hole of the pressure-resistant cylinder body, fixed by threads, and sealed by an O-ring on the output valve group; the reciprocating drive piston mechanism is located in the driving insertion hole of the pressure-resistant cylinder body, fixed by threads, and sealed by an O-ring on the driving insertion hole of the pressure-resistant cylinder body; The input valve group includes a connector, an input valve seat, a lower support seat for an input valve core return spring, an input valve core return spring, an upper support seat for an input valve core return spring, an input valve core, and an O-ring, which are arranged in sequence along the axial direction; the external thread on the input valve seat is matched and fixed with the internal thread on the input insertion hole of the pressure-resistant cylinder body, the input valve seat shaft end is tightly attached to the upper step of the inner hole of the input insertion hole, and forms a groove with the input insertion hole step, and an O-ring is placed on the groove; the connector is axially fastened to the input valve seat by a thread, and a groove is provided on one end surface of the connector, and the groove is provided with a An O-ring is placed, and the other side of the O-ring is in close contact with the input valve seat; the upper side of the upper support seat of the input valve core reset spring is in close contact with a conical surface inside the input valve seat, and an inner groove is provided on it for placing the input valve core reset spring; the other side of the input valve core reset spring is in close contact with the lower support seat of the input valve core reset spring; the axial thread of the lower support seat of the input valve core reset spring is fastened with the thread of the shaft end of one side of the input valve core; a convex conical surface is provided on the other side of the shaft end of the input valve core, and the convex conical surface of the input valve core is matched with the concave conical surface of the top shaft end of the input valve seat; The reciprocating drive piston mechanism includes a wear-resistant ring, an O-ring, a support ring, a piston and a piston sealing assembly, which are arranged in sequence along the axial direction; the support ring is fixed by the external thread on it and the internal thread of the drive insertion hole on the pressure-resistant cylinder body; the wear-resistant ring is provided with a protruding annular shaft to cooperate with the drive insertion hole on the pressure-resistant cylinder body, and the drive insertion hole is provided with an O-ring on the groove at this position, and the inner side of the O-ring cooperates with the annular shaft of the wear-resistant ring; the support ring shaft end is tightly attached to one side end face of the annular shaft of the wear-resistant ring, and one side shaft end of the wear-resistant ring An outer arc surface is provided, and the arc surface cooperates with the inner arc surface on the drive insertion hole; the outer diameter of a section of the shaft between the protruding annular shaft and the outer arc surface on the wear-resistant ring is slightly smaller than the drive insertion hole at this position; the wear-resistant ring is provided with an inner hole, and the inner hole cooperates with the piston, and the piston can flexibly move along the axial direction of the inner hole of the wear-resistant ring; a groove is provided on the piston, and a piston sealing assembly is placed in the groove, and the outer diameter of the piston sealing assembly cooperates with the inner hole of the wear-resistant ring; the inner side of the piston sealing assembly is an O-ring, and the outer side is covered with a polyurethane outer ring; The input valve group is connected to the adjustable ballast water tank of the submersible, and is used to suck the normal pressure ballast water of the adjustable ballast water tank of the submersible into the plunger pump body, and at the same time provide a seal between the adjustable ballast water tank and the plunger pump body; the output valve group is connected to the external seawater, and is used to discharge the water in the plunger pump body into the external seawater, and at the same time provide a seal between the plunger pump body and the external seawater; the reciprocating drive piston mechanism is connected to the reciprocating drive mechanism with the power source, and is used to drive the piston movement; the pressure-resistant cylinder body is connected to the housing of the power source through the bolt hole; The output valve group includes a connector, an output valve seat, an output valve core reset spring support seat, an output valve core reset spring, an output valve core, and an O-ring, which are arranged in sequence along the axial direction; the external thread on the output valve seat is matched and fixed with the internal thread on the output plug-in hole of the pressure-resistant cylinder body, and the shaft end on one side of the output valve seat is tightly attached to the step on the inner hole of the output plug-in hole, and forms a groove with the step of the output plug-in hole, and an O-ring is placed on the groove; the connector is axially fastened to the output valve seat through a thread, and a groove is provided on one end surface of the connector, and the groove is provided with an O-ring, and the other side of the O-ring is tightly attached to the output valve seat; the axial thread on one side of the output valve core reset spring support seat is fastened with the thread in the output valve seat; the other side of the output valve core reset spring support seat is provided with an inner groove for placing the output valve core reset spring; the other side of the output valve core reset spring is tightly attached to the shaft shoulder on one side of the output valve core; the other side of the output valve core shaft end is provided with a convex conical surface, and the convex conical surface of the output valve core is matched with an inner concave conical surface at the inner hole at the bottom of the output valve seat.

2. A buoyancy regulating plunger pump device for a full-sea-depth submersible according to claim 1, characterized in that: The convex conical surface of the input valve core has an included angle of 89°; the concave conical surface of the input valve seat has an included angle of 90°.

3. A buoyancy regulating plunger pump device for a full-sea-depth submersible according to claim 2, characterized in that: The Rockwell hardness difference between the input valve seat and the input valve core is greater than 5HRC.

4. A buoyancy regulating plunger pump device for a full-sea-depth submersible according to claim 1, characterized in that: The convex conical surface of the output valve core has an included angle of 89.5°; the concave conical surface of the output valve seat has an included angle of 90°.

5. A buoyancy regulating plunger pump device for a full-sea-depth submersible according to claim 4, characterized in that: The Rockwell hardness difference between the output valve seat and the output valve core is greater than 5HRC.

6. A buoyancy regulating plunger pump device for a full-sea-depth submersible according to claim 1, characterized in that: The Rockwell hardness difference between the wear-resistant ring and the piston is greater than 5HRC.

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