Seawater hydraulic sequence valve

Abstract

The seawater hydraulic sequence valve comprises a valve body, a first internal thread, an upper hole, a lower hole and a second internal thread are sequentially arranged in the middle of the valve body from top to bottom, and a transverse hole is formed in the portion, located on one side wall of the upper hole, of the valve body; an upper valve cover is cooperatively mounted at the first internal thread of the valve body, a valve rod is cooperatively mounted in the center of the upper valve cover, and a spring is sleeved on the valve rod; a lower valve deck is installed at the second internal thread in a matched mode, a valve seat is arranged on the top face of the lower valve deck, a valve element is installed on the valve seat in a matched mode through a lifting basket, and the bottom of the valve rod is matched with and abuts against the valve element. The valve is compact and reasonable in structure and convenient to operate, through the unique design of the valve body, the upper valve cover, the lower valve cover, the valve rod and the valve element, the change of opening pressure along with depth can be conveniently and effectively reduced, meanwhile, the ceramic valve port and the optimally designed valve rod are adopted, the problems of sediment erosion, seawater cavitation and the like can be effectively solved, and the service life of the valve is prolonged. The use requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of submersible auxiliary valves, in particular to a seawater hydraulic sequence valve. Background Art

[0002] Submersibles are important equipment for efficient exploration, scientific investigation, development operations, military detection and combat platforms. The balance between gravity and buoyancy is often broken due to the increase in weight of the submersible after sampling or the decrease in weight after releasing other equipment, or the change in seawater density caused by the characteristics of the water medium (pressure, temperature); or the change in displacement volume caused by the elastic deformation of the submersible's pressure-resistant structure as the diving depth increases. Therefore, in order to ensure that the submersible has a relatively stable operating posture at a certain depth, it is necessary to adjust its buoyancy.

[0003] A typical submersible buoyancy adjustment system consists of a seawater pump, related valves and a pressure water tank. The seawater pump injects seawater from the side of the ship into the pressure water tank to increase the weight of the submersible, and discharges the seawater in the pressure water tank to reduce the weight of the submersible, thereby adjusting the net buoyancy. This adjustment method has been applied to major deep-sea manned submersibles due to its outstanding advantages.

[0004] For example, the invention disclosed in the publication number CN106516057B, "A Hydraulic System for Adjusting the Buoyancy of a Full-Ocean-Depth Submersible", adopts the traditional seawater pump buoyancy adjustment scheme to solve the buoyancy adjustment problem of a full-ocean-depth submersible; the inlet of the sequence valve of the invention is connected to the outlet of the booster cylinder (whose inlet pressure is P 海 +P 压差 , P 海 is the marine environmental pressure, P 压差 The outlet is connected to the ballast water tank (the outlet pressure is P 舱 , pressure in the pressure water tank), the spring chamber is connected to the seawater outside the ship (the pressure in the spring chamber is P 海 ), its hydraulic symbol is shown in Figure 1 , the conditions for opening the sequence valve are:

[0005] (P 海 +P 压差 )A 进 >P 海 A 弹 +F

[0006] in:

[0007] A 进 is the pressure-bearing area of ​​the sequence valve inlet;

[0008] A 弹 is the pressure-bearing area of ​​the spring chamber;

[0009] F is the setting force of the spring.

[0010] The function of the sequence valve is to ensure that the difference between the outlet pressure of the booster cylinder and the external environment pressure is always equal to the spring set pressure, so as to ensure that the system does not lose control during the water injection process. As can be seen from the above formula, if A 进 and A 弹 If the areas are not equal, the opening pressure of the sequence valve will change with the depth of the ocean environment. Under full sea depth conditions, it will cause the pressure difference P between the inlet and outlet of the booster cylinder to 压差 Too high, resulting in the weight and size of the booster cylinder being too large, and the power of the entire buoyancy adjustment system being too large.

[0011] Due to the particularity of this sequence valve, there are no related products available on the market.

[0012] In addition, there is a large amount of suspended sand in the seawater, and cavitation is prone to occur in the seawater. It is necessary to design a suitable valve port structure to solve the problems of sediment erosion and seawater cavitation. Summary of the invention

[0013] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a seawater hydraulic sequence valve, which can effectively reduce the change of the opening pressure with depth. At the same time, the use of ceramic valve ports and optimized valve stems can effectively resist sediment erosion and seawater cavitation problems.

[0014] The technical solution adopted by the present invention is as follows:

[0015] A seawater hydraulic sequence valve comprises a valve body, wherein the middle part of the valve body is provided with a first internal thread, an upper hole, a lower hole and a second internal thread in sequence from top to bottom, and a transverse hole is opened on the valve body on a side wall located at the upper hole; an upper valve cover is mounted on the first internal thread of the valve body, a valve stem is mounted on the center of the upper valve cover, and a spring is sleeved on the valve stem; a lower valve cover is mounted on the second internal thread, a valve seat is provided on the top surface of the lower valve cover, a valve core is mounted on the valve seat through a lifting basket, and the bottom of the valve stem matches and abuts against the valve core.

[0016] Its further technical solution is:

[0017] The valve body is in a rectangular parallelepiped structure.

[0018] A sea port is opened in the center of the upper valve cover, and a through hole is provided below the sea port. The valve stem is installed inside the through hole through a sealing ring. The outside of the upper valve cover is provided with a first external thread matching with the first internal thread, and a first outer cylindrical surface matching with the upper hole.

[0019] The through hole is a precision-machined hole, and the aperture of the through hole is D4.

[0020] A center hole is arranged at the center of the lower valve cover, a through hole is arranged above the center hole, and a second outer thread matched with the second inner thread and a second outer cylindrical surface matched with the lower hole are arranged on the outside of the lower valve cover.

[0021] The valve stem is an integrated stepped shaft structure, and the valve stem is provided with a No. 1 cylindrical section, a No. 2 cylindrical section and a No. 3 cylindrical section from top to bottom, a first arc and a second arc with equal diameters are provided between the No. 2 cylindrical section and the No. 3 cylindrical section, a cone structure is provided at the bottom center of the No. 3 cylindrical section, the cone structure is tangent to the outer spherical surface of the valve core, and a third arc is provided between the cone structure and the No. 3 cylindrical section.

[0022] The cone angle of the cone structure is 120°.

[0023] The basket adopts a circular ring structure, an inner circle is arranged inside the basket, and a plurality of arc structures are arranged on the inner circle.

[0024] The valve seat adopts a circular ring structure.

[0025] The valve seat and the valve core are both made of ceramic material.

[0026] The beneficial effects of the present invention are as follows:

[0027] The present invention has a compact and reasonable structure and is easy to operate. The valve body, upper valve cover, lower valve cover, valve stem and valve core are uniquely designed, and the cooperation of the overall structure can effectively reduce the change of the opening pressure with depth. At the same time, the ceramic valve port and the optimally designed valve stem can effectively resist sediment erosion and seawater cavitation problems, etc., and meet the use requirements.

[0028] The present invention adopts a valve port structure of ceramic ball + ceramic valve seat, which can effectively resist sediment erosion and seawater cavitation. The optimized valve stem can effectively resist seawater cavitation behind the valve core. Through the tolerance control of related parts, the opening pressure of the sequence valve can be effectively controlled to change with depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the hydraulic symbol diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the present invention (showing the internal structure).

[0031] Figure 3 It is a structural schematic diagram of the basket handle of the present invention.

[0032] Figure 4 It is a structural schematic diagram of the valve seat of the present invention.

[0033] Figure 5 It is a schematic diagram of the structure of the valve core closed on the valve seat of the present invention.

[0034] Figure 6 It is a structural schematic diagram of the valve stem of the present invention.

[0035] Among them: 1. Upper valve cover; 2. Valve body; 3. Lower valve cover; 4. Valve stem; 5. Lifting basket; 6. Valve core; 7. Valve seat; 8. Spring;

[0036] 101, sea port; 102, first external thread; 103, first outer cylindrical surface; 104, through hole;

[0037] 201, first internal thread; 202, upper hole; 203, horizontal hole; 204, lower hole; 205, second internal thread;

[0038] 301, center hole; 302, second external thread; 303, second outer cylindrical surface; 304, through hole;

[0039] 401, cylindrical segment No. 1; 402, cylindrical segment No. 2; 403, first arc; 404, second arc; 405, cylindrical segment No. 3; 406, third arc; 407, cone structure;

[0040] 501. Inner circle; 502. Arc structure. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0042] like Figure 1-Figure 6 As shown, the seawater hydraulic sequence valve of this embodiment includes a valve body 2, and the middle part of the valve body 2 is provided with a first internal thread 201, an upper hole 202, a lower hole 204 and a second internal thread 205 in sequence from top to bottom, and a transverse hole 203 is opened on the valve body 2 on one side wall located at the upper hole 202; an upper valve cover 1 is installed at the first internal thread 201 of the valve body 2, and a valve stem 4 is installed at the center of the upper valve cover 1, and a spring 8 is sleeved on the valve stem 4; a lower valve cover 3 is installed at the second internal thread 205, and a valve seat 7 is provided on the top surface of the lower valve cover 3, and a valve core 6 is installed on the valve seat 7 through a lifting basket 5, and the bottom of the valve stem 4 matches and abuts against the valve core 6.

[0043] The valve body 2 is a rectangular parallelepiped structure.

[0044] A sea port 101 is opened in the center of the upper valve cover 1, and a through hole 104 is provided below the sea port 101. The valve stem 4 is installed inside the through hole 104 through a sealing ring. The outside of the upper valve cover 1 is provided with a first external thread 102 that cooperates with the first internal thread 201, and a first outer cylindrical surface 103 that cooperates with the upper hole 202.

[0045] The through hole 104 is a precision-machined hole, and the hole diameter of the through hole 104 is D4.

[0046] A center hole 301 is provided at the center of the lower valve cover 3 , a through hole 304 is provided above the center hole 301 , and a second outer thread 302 matched with the second inner thread 205 and a second outer circular surface 303 matched with the lower hole 204 are provided on the outside of the lower valve cover 3 .

[0047] The valve stem 4 is an integrated stepped shaft structure, and the valve stem 4 is provided with a No. 1 cylindrical section 401, a No. 2 cylindrical section 402 and a No. 3 cylindrical section 405 from top to bottom, and a first arc 403 and a second arc 404 with equal diameters are provided between the No. 2 cylindrical section 402 and the No. 3 cylindrical section 405. A conical structure 407 is provided at the bottom center of the No. 3 cylindrical section 405, and the conical structure 407 is tangent to the outer spherical surface of the valve core 6. A third arc 406 is provided between the conical structure 407 and the No. 3 cylindrical section 405.

[0048] The cone angle of the cone structure 407 is 120°.

[0049] The basket 5 adopts a circular ring structure. An inner circle 501 is arranged inside the basket 5 , and a plurality of arc structures 502 are arranged on the inner circle 501 .

[0050] The valve seat 7 adopts a circular ring structure.

[0051] The valve seat 7 and the valve core 6 are both made of ceramic material.

[0052] like Figure 1-Figure 6 As shown, the specific structure and function of a seawater hydraulic sequence valve of this embodiment are as follows:

[0053] It mainly includes: an upper valve cover 1, a valve body 2, a lower valve cover 3, a valve stem 4, a lifting basket 5, a valve core 6, a valve seat 7, and a spring 8.

[0054] Among them, the upper valve cover 1 is a step structure with a hole in the center, and a sea port 101 (O port) and a through hole 104 are set at the center position. The through hole 104 is a finely machined hole with a diameter of D4, and a first external thread 102 and a first external cylindrical surface 103 are set on its outer side.

[0055] The lower valve cover 3 is also a central hole-step structure, with a central hole 301 (P port) and a through hole 304 in the center, and a second external thread 302 and a second outer cylindrical surface 303 on the outer side.

[0056] Among them, the valve body 2 is a preferred rectangular structure, and is sequentially provided with a first internal thread 201, an upper hole 202, a lower hole 204 (with a diameter of D2) and a second internal thread 205 along the length direction, and the transverse hole 203 (T-mouth) and the upper hole 202 are orthogonal and communicated with each other; the first external thread 102 of the upper valve cover 1 and the first internal thread 201 of the valve body 2 are screwed together, and the first outer cylindrical surface 103 and the upper hole 202 of the valve body 2 are sealed and matched.

[0057] The second external thread 302 of the lower valve cover 3 is threadedly connected with the second internal thread 205 of the valve body 2 , and the second outer cylindrical surface 303 is sealedly matched with the lower hole 204 of the valve body 2 .

[0058] Among them, the main body of the valve stem 4 is a stepped shaft structure, on which are arranged a No. 1 cylindrical segment 401, a No. 2 cylindrical segment 402, and a No. 3 cylindrical segment 405 (with a diameter of d3), and a first arc 403 and a second arc 404 with equal diameters are arranged between the No. 2 cylindrical segment 402 and the No. 3 cylindrical segment 405, wherein the first arc 403 is tangent to the second arc 404 and the No. 2 cylindrical segment 402 respectively, and the second arc 404 is tangent to the No. 3 cylindrical segment 405; a cone structure 407 is arranged at the center of the lower end face of the No. 3 cylindrical segment 405, and the cone angle of the cone structure 407 is 120°, and it is tangent to the outer spherical surface of the valve core 6, and the diameter of the tangent circle is b, b=(0.45-0.55)d1.

[0059] A third arc 406 is disposed between the conical structure 407 and the third cylindrical segment 405 , and the third arc 406 is tangent to both of them.

[0060] The first cylindrical section 401 of the valve stem 4 and the through hole 104 of the upper valve cover 1 are radially sealed.

[0061] The valve stem 4 is further characterized by: d3=d1+(1-2)mm; since the pressure at the P port is the outlet pressure of the booster cylinder and the pressure at the T port is the internal pressure of the pressure water tank, the pressure difference on both sides of the valve port is large, and the seawater flow rate at the valve port is extremely high, resulting in extremely low pressure in a local area in the upper hole 202 of the valve body 2, which will cause cavitation. After simulation and testing, the arc setting near the No. 3 cylindrical section 405 of the valve stem 4 and the value of the diameter of the No. 3 cylindrical section 405 can effectively reduce cavitation, thereby increasing the life of the sequence valve.

[0062] The spring 8 is a cylindrical compression spring, the inner hole of which passes through the second cylindrical section 402 of the valve stem 4 , and the two end faces are respectively in contact with the end face of the first outer cylindrical surface 103 and the first arc 403 .

[0063] The basket 5 is a circular ring structure, and its inner circle 501 has a diameter D5, D5 = d1 + (0.3-0.5) mm. This arrangement can ensure that the valve core 6 is reliably guided when it is opened or closed. Several arc structures 502 are arranged on the inner circle 501, and when the valve core 6 is opened, they are used to flow seawater.

[0064] The valve seat 7 is a circular ring structure and is made of ceramic material. Its thickness is generally not more than 10 mm. A chamfer is provided on one side of the inner hole. The chamfer angle is 45° and the length a is between 0.5-1 mm.

[0065] The valve core 6 is a ball made of ceramic material, and its diameter is d1; the contact circle diameter of the valve core 6 and the valve seat 7 is D3.

[0066] The diameter D4 of the through hole 104 of the upper valve cover 1 is equal to D3+(0-0.005) mm. Controlling the tolerance in this way can ensure both the feasibility of processing and the controllability of the opening pressure of the sequence valve changing with the depth.

[0067] The valve seat 7 and the valve core 6 are ground in pairs to ensure the integrity of the contact circle between the valve core 6 and the valve seat 7 without discontinuity, and are installed in pairs;

[0068] The inner diameter D1 of the valve seat 7 is preferably The outer diameter d2 = D2-(0-0.03) mm. Due to the fragility of ceramics, the outer circle of the valve seat 7 and the lower hole 204 in the valve body 2 are matched in this way to ensure that when the valve core 6 presses the valve seat 7 downward, the valve seat 7 is effectively supported by the lower hole 204 in the valve body 2 in terms of strength.

[0069] The assembly relationship of the valve port is as follows: the end face of the second outer cylindrical surface 303 of the lower valve cover 3 presses the non-chamfered end face of the valve seat 7, and then the chamfered end face of the valve seat 7 presses the step end face from the basket 5 to the lower hole 204 of the valve body 2; under the preload force of the spring 8, the conical structure 407 of the valve stem 4 presses the valve core 6, and the valve core 6 passes through the inner circle 501 of the basket 5 and is pressed on the chamfer of the valve seat 7.

[0070] The working principle of the present invention is:

[0071] The center hole 301 (P port) is connected to the outlet of the booster cylinder, the sea port 101 (O port) is connected to the seawater outside the ship, and the transverse hole 203 (T port) is connected to the pressure water tank;

[0072] In the initial state, the preload force of the spring 8 is F, and the spring 8 presses the valve core 6 tightly against the valve seat 7 to form an initial seal.

[0073] The seawater pressure is P 海 When the boost cylinder is started, the inlet and outlet pressure difference gradually increases until it reaches P 压差 , when (P 海 +P 压差 )πD3 2 >P 海 πD4 2 When +F, the sequence valve opens, and the seawater at the booster cylinder outlet flows from port P to port T.

[0074] It can be seen from the above formula that D4=D3+(0-0.005)mm, which can ensure the feasibility of mechanical processing and ensure that as the depth increases, the valve core 6 and the valve seat 7 are pressed tighter and tighter, thereby ensuring the reliability of the sequence valve seal and thus ensuring the safety of the entire buoyancy adjustment system; at the same time, a smaller positive tolerance can ensure that even if the depth increases to the full sea depth, the increase in the sequence valve opening force caused by the depth is within an effective controllable range.

[0075] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A seawater hydraulic sequence valve, characterized in that: The invention comprises a valve body (2), wherein the middle part of the valve body (2) is provided with a first internal thread (201), an upper hole (202), a lower hole (204) and a second internal thread (205) in sequence from top to bottom, and a transverse hole (203) is opened on the valve body (2) on one side wall located at the upper hole (202); an upper valve cover (1) is mounted on the first internal thread (201) of the valve body (2), a valve stem (4) is mounted on the center of the upper valve cover (1), and a spring (8) is sleeved on the valve stem (4); a lower valve cover (3) is mounted on the second internal thread (205), a valve seat (7) is arranged on the top surface of the lower valve cover (3), a valve core (6) is mounted on the valve seat (7) through a lifting basket (5), and the bottom of the valve stem (4) matches and abuts against the valve core (6).

2. A seawater hydraulic sequence valve according to claim 1, characterized in that: The valve body (2) is in a rectangular parallelepiped structure.

3. A seawater hydraulic sequence valve according to claim 1, characterized in that: The upper valve cover (1) has a sea opening (101) at its center, and a through hole (104) is provided below the sea opening (101). A valve stem (4) is installed inside the through hole (104) via a sealing ring. The outer portion of the upper valve cover (1) is provided with a first external thread (102) that cooperates with a first internal thread (201), and a first outer cylindrical surface (103) that cooperates with the upper hole (202).

4. A seawater hydraulic sequence valve as claimed in claim 3, characterized in that: The through hole (104) is a precision-machined hole, and the hole diameter of the through hole (104) is D4.

5. A seawater hydraulic sequence valve according to claim 1, characterized in that: A center hole (301) is provided at the center of the lower valve cover (3), a through hole (304) is provided above the center hole (301), and a second outer thread (302) matching with the second inner thread (205) and a second outer cylindrical surface (303) matching with the lower hole (204) are provided on the outside of the lower valve cover (3).

6. A seawater hydraulic sequence valve according to claim 1, characterized in that: The valve stem (4) is an integrated stepped shaft structure, and the valve stem (4) is provided with a first cylindrical section (401), a second cylindrical section (402) and a third cylindrical section (405) from top to bottom in sequence, a first circular arc (403) and a second circular arc (404) of equal diameter are provided between the second cylindrical section (402) and the third cylindrical section (405), a conical structure (407) is provided at the bottom center of the third cylindrical section (405), the conical structure (407) is tangent to the outer spherical surface of the valve core (6), and a third circular arc (406) is provided between the conical structure (407) and the third cylindrical section (405).

7. A seawater hydraulic sequence valve according to claim 6, characterized in that: The cone angle of the cone structure (407) is 120°.

8. A seawater hydraulic sequence valve according to claim 1, characterized in that: The basket (5) adopts a circular ring structure, an inner circle (501) is arranged inside the basket (5), and a plurality of arc structures (502) are arranged on the inner circle (501).

9. A seawater hydraulic sequence valve according to claim 1, characterized in that: The valve seat (7) adopts a circular ring structure.

10. A seawater hydraulic sequence valve according to claim 1, characterized in that: The valve seat (7) and the valve core (6) are both made of ceramic material.

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