Seawater hydraulic sequence valve

Abstract

The present application relates to a kind of seawater hydraulic sequence valve, including valve body, the middle part of the valve body is sequentially provided with first internal thread, upper hole, lower hole and second internal thread from top to bottom, the lateral wall at upper hole is opened with transverse hole on the valve body;First internal thread of valve body is cooperatively installed with upper valve cover, the center of upper valve cover is cooperatively installed with valve rod, while spring is sleeved on valve rod;Cooperatively installed with lower valve cover at second internal thread, the top surface of lower valve cover is provided with valve seat, valve core is cooperatively installed on valve seat by basket, and the bottom of valve rod is matched with valve core and abuts.This application is compact, reasonable, easy to operate, by the unique design of valve body, upper valve cover, lower valve cover, valve rod and valve core, the mutual cooperation of its overall structure can conveniently and effectively reduce the change of opening pressure with depth, while using ceramic valve port and optimally designed valve rod, can effectively resist silt erosion and seawater cavitation problem, etc., meet the use requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of auxiliary valve for submersible, in particular to a seawater hydraulic sequence valve. BACKGROUND

[0002] The submersible is an important equipment for efficient exploration, scientific investigation, development operation, military detection and combat platform. After sampling, the weight of the submersible increases or the weight decreases after releasing other equipment, or the seawater density changes due to the characteristics (pressure, temperature) of the water medium; or the elastic deformation of the pressure-resistant structure of the submersible occurs with the increase of the diving depth, which causes the change of the displacement volume. These factors all lead to the balance of gravity and buoyancy being broken frequently. Therefore, in order to ensure that the submersible has a relatively stable working posture at a certain depth, it is necessary to adjust the buoyancy of the submersible.

[0003] A typical submersible buoyancy adjustment system is composed of a seawater pump, related valve parts and a pressure-resistant water tank. The seawater pump injects the seawater outside the hull into the pressure-resistant water tank to increase the weight of the submersible, and discharges the seawater in the pressure-resistant water tank outside the hull to reduce the weight of the submersible, so as to adjust the net buoyancy. This adjustment method has been applied to major manned submersibles due to its outstanding advantages.

[0004] For example, the hydraulic system for adjusting the buoyancy of a full-sea-depth submersible disclosed in CN106516057B adopts a traditional seawater pump type buoyancy adjustment scheme to solve the problem of buoyancy adjustment of a full-sea-depth submersible. The sequence valve inlet of the invention is connected to the outlet of the pressure cylinder (the inlet pressure thereof is P 海 +P 压差 , P 海 is the ocean environment pressure, P 压差 is the pressure difference between the inlet and outlet of the pressure cylinder), the outlet is connected to the ballast water tank (the outlet pressure thereof is P 舱 , the pressure in the pressure-resistant water tank), the spring cavity is connected to the seawater outside the hull (the pressure in the spring cavity is P 海 ), and the hydraulic symbol thereof is shown in Figure 1 The opening condition of the sequence valve is:

[0005] (P 海 +P 压差 )A 进 >P 海 A 弹 +F

[0006] Wherein:

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

[0008] A 弹 is the pressure bearing area of the spring cavity;

[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 pressure cylinder and the ambient pressure is always equal to the spring setting pressure, and to ensure that the water injection process does not lose control. From the above formula, if A 进 and A 弹 are not equal, the opening pressure of the sequence valve will change with the depth of the sea environment, and in the full-sea-depth working condition, the pressure difference P 压差 of the inlet and outlet of the pressure cylinder will be too high, thereby causing the weight, size of the pressure cylinder and the power of the entire buoyancy regulating system to be too large.

[0011] Due to the particularity of the sequence valve, there is no related product available on the market.

[0012] In addition, there is a large amount of suspended sand in seawater, and seawater is prone to cavitation, so a suitable valve port structure needs to be designed to solve the problems of sand erosion and seawater cavitation. SUMMARY

[0013] In view of the above-mentioned shortcomings in the prior production technology, the applicant provides a seawater hydraulic sequence valve, so that the change of the opening pressure with the depth can be effectively reduced, and the ceramic valve port and the optimally designed valve rod can effectively resist the problems of sand erosion and seawater cavitation.

[0014] The technical scheme adopted by the present application is as follows:

[0015] A seawater hydraulic sequence valve, comprising a valve body, a first internal thread, an upper hole, a lower hole and a second internal thread are sequentially arranged from top to bottom in the middle part of the valve body, and a horizontal hole is opened in a side wall of the valve body at the upper hole; an upper valve cover is cooperatively installed at the first internal thread of the valve body, a valve rod is cooperatively installed at the center of the upper valve cover, and a spring is sleeved on the valve rod; a lower valve cover is cooperatively installed at the second internal thread, a valve seat is arranged on the top surface of the lower valve cover, a valve core is cooperatively installed on the valve seat through a basket, and the bottom of the valve rod is matched and abutted with the valve core.

[0016] The further technical scheme is:

[0017] The valve body is in a cuboid structure.

[0018] A through-sea port is opened in the center of the upper valve cover, a through hole is below the through-sea port, the valve rod is installed in the through hole through a sealing ring, the outer part of the upper valve cover is provided with a first external thread matched with the first internal thread and a first external circular surface matched with the upper hole.

[0019] The through hole is a precision hole, and the hole diameter of the through hole is D4.

[0020] The center of the lower valve cover is provided with a center hole, an upper side of the center hole is provided with a through hole, and the outer side of the lower valve cover is provided with a second external thread matched with the second internal thread and a second external circular surface matched with the lower hole.

[0021] The valve rod is a one-piece stepped shaft structure, and the valve rod is sequentially provided with a first cylinder segment, a second cylinder segment and a third cylinder segment from top to bottom, the second cylinder segment and the third cylinder segment are provided with a first circular arc and a second circular arc with equal diameters, the bottom center position of the third cylinder segment is provided with a conical structure, the conical structure is tangent to the outer spherical surface of the valve core, and the third circular arc is arranged between the conical structure and the third cylinder segment.

[0022] The conical structure has a conical angle of 120°.

[0023] The basket adopts a circular ring structure, and the inner side of the basket is provided with an inner circle, and the inner circle is provided with a plurality of arc structures.

[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 application are as follows:

[0027] The present application has the advantages of compact and reasonable structure, convenient operation, and the like, and the overall structure of the valve body, the upper valve cover, the lower valve cover, the valve rod and the valve core can effectively reduce the change of opening pressure with depth, and the ceramic valve port and the optimally designed valve rod can effectively resist the problems of silt erosion and seawater cavitation, thereby meeting the use requirements.

[0028] The valve port structure of ceramic ball + ceramic valve seat can effectively resist silt erosion and seawater cavitation, the optimally designed valve rod can effectively resist seawater cavitation after the valve core, and the tolerance control of related parts can effectively control the change of opening pressure of the sequence valve with depth. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The hydraulic symbol diagram of the present application.

[0030] Figure 2 The structural schematic diagram of the present application (showing the internal structure).

[0031] Figure 3 The structural schematic diagram of the basket of the present application.

[0032] Figure 4 The structural schematic diagram of the valve seat of the present application.

[0033] Figure 5 The structural schematic diagram of the valve core closed on the valve seat of the present application.

[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, seaport; 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, conical structure;

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

[0041] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0042] like Figures 1-6 As shown, the seawater hydraulic sequence valve of this embodiment includes a valve body 2. The middle portion 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. 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, and 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, and a valve seat 7 is provided 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.

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

[0044] A sea opening 101 is opened in the center of the upper valve cover 1, and a through hole 104 is provided below the sea opening 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 circular surface 103 that cooperates with the upper hole 202.

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

[0046] The center of the lower valve cover 3 is provided with a center hole 301, and a through hole 304 is arranged above the center hole 301. The outer part of the lower valve cover 3 is provided with a second external thread 302 matched with the second internal thread 205, and a second external circular surface 303 matched with the lower hole 204.

[0047] The valve stem 4 is a one-piece stepped shaft structure. The valve stem 4 is sequentially provided with a first cylindrical section 401, a second cylindrical section 402, and a third cylindrical section 405 from top to bottom. The second cylindrical section 402 and the third cylindrical section 405 are provided with a first circular arc 403 and a second circular arc 404 with equal diameters. The bottom center of the third cylindrical section 405 is provided with a conical structure 407 which is tangent to the outer spherical surface of the valve core 6. The third circular arc 406 is arranged between the conical structure 407 and the third cylindrical section 405.

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

[0049] The basket 5 adopts a circular ring structure. The inner part of the basket 5 is provided with an inner circle 501, 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] As shown in the drawings, the specific structure and function of the seawater hydraulic sequence valve of the embodiment are as follows: Figures 1-6

[0053] Mainly includes: upper valve cover 1, valve body 2, lower valve cover 3, valve stem 4, basket 5, valve core 6, valve seat 7, spring 8.

[0054] Among them, the upper valve cover 1 is a stepped structure with a hole in the center, and the center is provided with a through seawater port 101 (O port) and a through hole 104. The through hole 104 is a fine machining hole with a diameter of D4. The outer side is provided with a first external thread 102 and a first external circular surface 103.

[0055] Among them, the lower valve cover 3 is also a stepped structure with a hole in the center, and the center is provided with a center hole 301 (P port) and a through hole 304. The outer side is provided with a second external thread 302 and a second external circular surface 303.

[0056] Among them, the valve body 2 is preferably a rectangular structure. Along the length direction, it 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. The transverse hole 203 (T port) and the upper hole 202 are orthogonal and communicate. The first external thread 102 of the upper valve cover 1 is screwed with the first internal thread 201 of the valve body 2, and the first external circular surface 103 is sealingly matched with the upper hole 202 of the valve body 2.

[0057] ​The second outer thread 302 of the lower valve cover 3 is screwed with the second inner thread 205 of the valve body 2, and the second outer circular surface 303 is sealingly fitted with the lower hole 204 of the valve body 2.

[0058] The valve rod 4 is a stepped shaft structure, and a first cylindrical segment 401, a second cylindrical segment 402 and a third cylindrical segment 405 (with a diameter d3) are arranged on the valve rod 4. A first circular arc 403 and a second circular arc 404 with equal diameters are arranged between the second cylindrical segment 402 and the third cylindrical segment 405. The first circular arc 403 is tangent to the second circular arc 404 and the second cylindrical segment 402 respectively, and the second circular arc 404 is tangent to the third cylindrical segment 405. A conical structure 407 is arranged at the center of the lower end surface of the third cylindrical segment 405. The conical structure 407 has a conical angle of 120° and is tangent to the outer spherical surface of the valve core 6. The tangent circle has a diameter b, and b = (0.45-0.55)d1.

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

[0060] The first cylindrical segment 401 of the valve rod 4 is radially sealingly fitted with the through hole 104 of the upper valve cover 1.

[0061] The valve rod 4 has the further features that 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-resistant water tank, the pressure difference on both sides of the valve port is large, the flow rate of seawater through the valve port is extremely high, and the pressure in the local area of the upper hole 202 of the valve body 2 is extremely low, which may cause cavitation. According to simulation and test, the arrangement of the circular arc near the third cylindrical segment 405 of the valve rod 4 and the value of the diameter of the third cylindrical segment 405 can effectively reduce cavitation and thus improve the service life of the sequence valve.

[0062] The spring 8 is a cylindrical compression spring, the inner hole of the spring 8 passes through the second cylindrical segment 402 of the valve rod 4, and the two end surfaces are in abutment with the end surface of the first outer circular surface 103 and the first circular arc 403 respectively.

[0063] The basket 5 is a circular ring structure, and the inner circle 501 has a diameter D5, and D5 = d1 + (0.3-0.5) mm. In this way, reliable guidance can be obtained when the valve core 6 is opened or closed. A plurality of arc structures 502 are arranged on the inner circle 501 and used for passing seawater when the valve core 6 is opened.

[0064] The valve seat 7 is a circular ring structure and is made of ceramic material. The thickness of the valve seat 7 is generally not more than 10 mm, and a chamfer is arranged on one side of the inner hole. The chamfer has an angle of 45° and a length a of 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 D3+(0-0.005) mm, so that the tolerance is controlled, and the machining feasibility and the controllability of the opening pressure of the sequence valve changing with the depth are ensured.

[0067] The valve seat 7 and the valve core 6 are matched and ground, so that the integrity and continuity of the contact circle of the valve core 6 and the valve seat 7 are ensured, and the valve core 6 and the valve seat 7 are matched and installed;

[0068] The inner circle diameter D1 of the valve seat 7 is preferably taken as D2-(0-0.03) mm. The outer circle diameter d2 of the valve seat 7 is D2-(0-0.03) mm, and due to the fragility of the ceramic, the outer circle of the valve seat 7 and the lower hole 204 in the valve body 2 are matched, so that when the valve core 6 is tightly pressed against the valve seat 7, the valve seat 7 is effectively supported by the lower hole 204 in the valve body 2 in strength.

[0069] The assembly relationship of the valve port is that the end surface of the second outer circular surface 303 of the lower valve cover 3 tightly presses the unchamfered end surface of the valve seat 7, and then the chamfered end surface of the valve seat 7 tightly presses the lower hole 204 step end surface of the valve body 2 to the basket 5; under the pre-tightening force of the spring 8, the conical structure 407 tightly presses the valve core 6, and the valve core 6 tightly presses on the chamfer of the valve seat 7 after passing through the inner circle 501 of the basket 5.

[0070] The working principle of the application is as follows:

[0071] The central hole 301 (P port) is connected to the pressure cylinder outlet, the through hole 101 (O port) is connected to the outboard seawater, and the transverse hole 203 (T port) is connected to the pressure-resistant water tank.

[0072] In the initial state, the pre-tightening force of the spring 8 is F, and the spring 8 tightly presses the valve core 6 on the valve seat 7 and forms an initial seal.

[0073] The seawater pressure is P 海 When the pressure cylinder is started, the inlet and outlet pressure difference gradually increases until it increases to P 压差 When (P 海 + P 压差 )πD3 2 >P 海 πD4 2 +F, the sequence valve is opened, and the seawater in the pressure cylinder outlet flows to the T port through the P port.

[0074] From the above formula, D4=D3+(0-0.005)mm, i.e. the machinability can be ensured, and as the depth increases, the valve core 6 and the valve seat 7 are pressed more tightly, the reliability of the sequence valve sealing is ensured, thereby the safety of the entire buoyancy regulating system is ensured; meanwhile, the smaller positive tolerance is taken, so that even if the depth increases to the full sea depth, the increase of the opening force of the sequence valve caused by the depth is within the effective controllable range.

[0075] The above description is an explanation of the application, not a limitation of the application, the scope defined by the application is referred to the claims, within the protection scope of the application, any form of modification can be made.

Claims

1. A seawater hydraulic sequence valve, characterized by: The valve body (2) comprises a valve body (2), wherein the middle portion 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 provided on the valve body (2) on one side wall 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 provided on the top surface of the lower valve cover (3), a valve core (6) is mounted on the valve seat (7) via a lifting basket (5), and the bottom of the valve stem (4) matches and abuts against the valve core (6); The upper valve cover (1) has a sea port (101) at its center, and the lower valve cover (3) has a center hole (301) at its center. The valve stem (4) is an integrated stepped shaft structure. 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. A first arc (403) and a second arc (404) of equal diameter 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). 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). The diameter of the valve core (6) is d1, and the diameter of the No. 3 cylindrical section (405) is d3, where d3=d1+(1-2) mm.

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

3. A seawater hydraulic sequence valve according to claim 1, characterized in that: Below the sea port (101) is a through hole (104), and 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 circular surface (103) that cooperates with the upper hole (202).

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

5. The seawater hydraulic sequence valve according to claim 1, characterized in that: A through hole (304) is provided above the central hole (301), and the exterior of the lower valve cover (3) is provided with a second external thread (302) that cooperates with the second internal thread (205), and a second outer circular surface (303) that cooperates with the lower hole (204).

6. The seawater hydraulic sequence valve according to claim 1, characterized in that: The cone angle of the conical structure (407) is 120°.

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

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

9. The 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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